int i, count = dma_map_sg(dev, sglist, nents, direction);
struct scatterlist *sg;
- for (i = 0, sg = sglist; i < count; i++, sg++) {
+ for_each_sg(sglist, sg, count, i) {
hw_address[i] = sg_dma_address(sg);
hw_len[i] = sg_dma_len(sg);
}
!Eblock/blk-barrier.c
!Eblock/blk-tag.c
!Iblock/blk-tag.c
+!Eblock/blk-integrity.c
+!Iblock/blktrace.c
+!Iblock/genhd.c
+!Eblock/genhd.c
</chapter>
<chapter id="chrdev">
Similar to read_expire mentioned above, but for writes.
-fifo_batch
+fifo_batch (number of requests)
----------
-When a read request expires its deadline, we must move some requests from
-the sorted io scheduler list to the block device dispatch queue. fifo_batch
-controls how many requests we move.
+Requests are grouped into ``batches'' of a particular data direction (read or
+write) which are serviced in increasing sector order. To limit extra seeking,
+deadline expiries are only checked between batches. fifo_batch controls the
+maximum number of requests per batch.
+
+This parameter tunes the balance between per-request latency and aggregate
+throughput. When low latency is the primary concern, smaller is better (where
+a value of 1 yields first-come first-served behaviour). Increasing fifo_batch
+generally improves throughput, at the cost of latency variation.
writes_starved (number of dispatches)
To play an audio CD, you should first unmount and remove any data
CDROM. Any of the CDROM player programs should then work (workman,
-workbone, cdplayer, etc.). Lacking anything else, you could use the
-cdtester program in Documentation/cdrom/sbpcd.
+workbone, cdplayer, etc.).
On a few drives, you can read digital audio directly using a program
such as cdda2wav. The only types of drive which I've heard support
obj-$(CONFIG_BLOCK) := elevator.o blk-core.o blk-tag.o blk-sysfs.o \
blk-barrier.o blk-settings.o blk-ioc.o blk-map.o \
- blk-exec.o blk-merge.o ioctl.o genhd.o scsi_ioctl.o \
- cmd-filter.o
+ blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \
+ ioctl.o genhd.o scsi_ioctl.o cmd-filter.o
obj-$(CONFIG_BLK_DEV_BSG) += bsg.o
obj-$(CONFIG_IOSCHED_NOOP) += noop-iosched.o
del_timer(&ad->antic_timer);
ad->antic_status = ANTIC_FINISHED;
/* see as_work_handler */
- kblockd_schedule_work(&ad->antic_work);
+ kblockd_schedule_work(ad->q, &ad->antic_work);
}
}
aic = ad->io_context->aic;
ad->antic_status = ANTIC_FINISHED;
- kblockd_schedule_work(&ad->antic_work);
+ kblockd_schedule_work(q, &ad->antic_work);
if (aic->ttime_samples == 0) {
/* process anticipated on has exited or timed out*/
*/
static int as_can_anticipate(struct as_data *ad, struct request *rq)
{
+#if 0 /* disable for now, we need to check tag level as well */
+ /*
+ * SSD device without seek penalty, disable idling
+ */
+ if (blk_queue_nonrot(ad->q)) axman
+ return 0;
+#endif
+
if (!ad->io_context)
/*
* Last request submitted was a write
if (ad->changed_batch && ad->nr_dispatched == 1) {
ad->current_batch_expires = jiffies +
ad->batch_expire[ad->batch_data_dir];
- kblockd_schedule_work(&ad->antic_work);
+ kblockd_schedule_work(q, &ad->antic_work);
ad->changed_batch = 0;
if (ad->batch_data_dir == REQ_SYNC)
bio->bi_end_io = bio_end_empty_barrier;
bio->bi_private = &wait;
bio->bi_bdev = bdev;
- submit_bio(1 << BIO_RW_BARRIER, bio);
+ submit_bio(WRITE_BARRIER, bio);
wait_for_completion(&wait);
return ret;
}
EXPORT_SYMBOL(blkdev_issue_flush);
+
+static void blkdev_discard_end_io(struct bio *bio, int err)
+{
+ if (err) {
+ if (err == -EOPNOTSUPP)
+ set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
+ clear_bit(BIO_UPTODATE, &bio->bi_flags);
+ }
+
+ bio_put(bio);
+}
+
+/**
+ * blkdev_issue_discard - queue a discard
+ * @bdev: blockdev to issue discard for
+ * @sector: start sector
+ * @nr_sects: number of sectors to discard
+ * @gfp_mask: memory allocation flags (for bio_alloc)
+ *
+ * Description:
+ * Issue a discard request for the sectors in question. Does not wait.
+ */
+int blkdev_issue_discard(struct block_device *bdev,
+ sector_t sector, sector_t nr_sects, gfp_t gfp_mask)
+{
+ struct request_queue *q;
+ struct bio *bio;
+ int ret = 0;
+
+ if (bdev->bd_disk == NULL)
+ return -ENXIO;
+
+ q = bdev_get_queue(bdev);
+ if (!q)
+ return -ENXIO;
+
+ if (!q->prepare_discard_fn)
+ return -EOPNOTSUPP;
+
+ while (nr_sects && !ret) {
+ bio = bio_alloc(gfp_mask, 0);
+ if (!bio)
+ return -ENOMEM;
+
+ bio->bi_end_io = blkdev_discard_end_io;
+ bio->bi_bdev = bdev;
+
+ bio->bi_sector = sector;
+
+ if (nr_sects > q->max_hw_sectors) {
+ bio->bi_size = q->max_hw_sectors << 9;
+ nr_sects -= q->max_hw_sectors;
+ sector += q->max_hw_sectors;
+ } else {
+ bio->bi_size = nr_sects << 9;
+ nr_sects = 0;
+ }
+ bio_get(bio);
+ submit_bio(DISCARD_BARRIER, bio);
+
+ /* Check if it failed immediately */
+ if (bio_flagged(bio, BIO_EOPNOTSUPP))
+ ret = -EOPNOTSUPP;
+ else if (!bio_flagged(bio, BIO_UPTODATE))
+ ret = -EIO;
+ bio_put(bio);
+ }
+ return ret;
+}
+EXPORT_SYMBOL(blkdev_issue_discard);
#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/task_io_accounting_ops.h>
-#include <linux/interrupt.h>
-#include <linux/cpu.h>
#include <linux/blktrace_api.h>
#include <linux/fault-inject.h>
*/
static struct workqueue_struct *kblockd_workqueue;
-static DEFINE_PER_CPU(struct list_head, blk_cpu_done);
-
static void drive_stat_acct(struct request *rq, int new_io)
{
struct hd_struct *part;
int rw = rq_data_dir(rq);
+ int cpu;
if (!blk_fs_request(rq) || !rq->rq_disk)
return;
- part = get_part(rq->rq_disk, rq->sector);
+ cpu = part_stat_lock();
+ part = disk_map_sector_rcu(rq->rq_disk, rq->sector);
+
if (!new_io)
- __all_stat_inc(rq->rq_disk, part, merges[rw], rq->sector);
+ part_stat_inc(cpu, part, merges[rw]);
else {
- disk_round_stats(rq->rq_disk);
- rq->rq_disk->in_flight++;
- if (part) {
- part_round_stats(part);
- part->in_flight++;
- }
+ part_round_stats(cpu, part);
+ part_inc_in_flight(part);
}
+
+ part_stat_unlock();
}
void blk_queue_congestion_threshold(struct request_queue *q)
memset(rq, 0, sizeof(*rq));
INIT_LIST_HEAD(&rq->queuelist);
- INIT_LIST_HEAD(&rq->donelist);
+ INIT_LIST_HEAD(&rq->timeout_list);
+ rq->cpu = -1;
rq->q = q;
rq->sector = rq->hard_sector = (sector_t) -1;
INIT_HLIST_NODE(&rq->hash);
blk_add_trace_pdu_int(q, BLK_TA_UNPLUG_TIMER, NULL,
q->rq.count[READ] + q->rq.count[WRITE]);
- kblockd_schedule_work(&q->unplug_work);
+ kblockd_schedule_work(q, &q->unplug_work);
}
void blk_unplug(struct request_queue *q)
}
EXPORT_SYMBOL(blk_unplug);
+static void blk_invoke_request_fn(struct request_queue *q)
+{
+ /*
+ * one level of recursion is ok and is much faster than kicking
+ * the unplug handling
+ */
+ if (!queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) {
+ q->request_fn(q);
+ queue_flag_clear(QUEUE_FLAG_REENTER, q);
+ } else {
+ queue_flag_set(QUEUE_FLAG_PLUGGED, q);
+ kblockd_schedule_work(q, &q->unplug_work);
+ }
+}
+
/**
* blk_start_queue - restart a previously stopped queue
* @q: The &struct request_queue in question
WARN_ON(!irqs_disabled());
queue_flag_clear(QUEUE_FLAG_STOPPED, q);
-
- /*
- * one level of recursion is ok and is much faster than kicking
- * the unplug handling
- */
- if (!queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) {
- q->request_fn(q);
- queue_flag_clear(QUEUE_FLAG_REENTER, q);
- } else {
- blk_plug_device(q);
- kblockd_schedule_work(&q->unplug_work);
- }
+ blk_invoke_request_fn(q);
}
EXPORT_SYMBOL(blk_start_queue);
* Only recurse once to avoid overrunning the stack, let the unplug
* handling reinvoke the handler shortly if we already got there.
*/
- if (!elv_queue_empty(q)) {
- if (!queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) {
- q->request_fn(q);
- queue_flag_clear(QUEUE_FLAG_REENTER, q);
- } else {
- blk_plug_device(q);
- kblockd_schedule_work(&q->unplug_work);
- }
- }
+ if (!elv_queue_empty(q))
+ blk_invoke_request_fn(q);
}
EXPORT_SYMBOL(__blk_run_queue);
void blk_cleanup_queue(struct request_queue *q)
{
+ /*
+ * We know we have process context here, so we can be a little
+ * cautious and ensure that pending block actions on this device
+ * are done before moving on. Going into this function, we should
+ * not have processes doing IO to this device.
+ */
+ blk_sync_queue(q);
+
mutex_lock(&q->sysfs_lock);
queue_flag_set_unlocked(QUEUE_FLAG_DEAD, q);
mutex_unlock(&q->sysfs_lock);
}
init_timer(&q->unplug_timer);
+ setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q);
+ INIT_LIST_HEAD(&q->timeout_list);
kobject_init(&q->kobj, &blk_queue_ktype);
* request queue; this lock will be taken also from interrupt context, so irq
* disabling is needed for it.
*
- * Function returns a pointer to the initialized request queue, or NULL if
+ * Function returns a pointer to the initialized request queue, or %NULL if
* it didn't succeed.
*
* Note:
q->request_fn = rfn;
q->prep_rq_fn = NULL;
q->unplug_fn = generic_unplug_device;
- q->queue_flags = (1 << QUEUE_FLAG_CLUSTER);
+ q->queue_flags = (1 << QUEUE_FLAG_CLUSTER |
+ 1 << QUEUE_FLAG_STACKABLE);
q->queue_lock = lock;
blk_queue_segment_boundary(q, 0xffffffff);
blk_rq_init(q, rq);
- /*
- * first three bits are identical in rq->cmd_flags and bio->bi_rw,
- * see bio.h and blkdev.h
- */
rq->cmd_flags = rw | REQ_ALLOCED;
if (priv) {
*/
void blk_start_queueing(struct request_queue *q)
{
- if (!blk_queue_plugged(q))
+ if (!blk_queue_plugged(q)) {
+ if (unlikely(blk_queue_stopped(q)))
+ return;
q->request_fn(q);
- else
+ } else
__generic_unplug_device(q);
}
EXPORT_SYMBOL(blk_start_queueing);
*/
void blk_requeue_request(struct request_queue *q, struct request *rq)
{
+ blk_delete_timer(rq);
+ blk_clear_rq_complete(rq);
blk_add_trace_rq(q, rq, BLK_TA_REQUEUE);
if (blk_rq_tagged(rq))
EXPORT_SYMBOL(blk_requeue_request);
/**
- * blk_insert_request - insert a special request in to a request queue
+ * blk_insert_request - insert a special request into a request queue
* @q: request queue where request should be inserted
* @rq: request to be inserted
* @at_head: insert request at head or tail of queue
* Many block devices need to execute commands asynchronously, so they don't
* block the whole kernel from preemption during request execution. This is
* accomplished normally by inserting aritficial requests tagged as
- * REQ_SPECIAL in to the corresponding request queue, and letting them be
- * scheduled for actual execution by the request queue.
+ * REQ_TYPE_SPECIAL in to the corresponding request queue, and letting them
+ * be scheduled for actual execution by the request queue.
*
* We have the option of inserting the head or the tail of the queue.
* Typically we use the tail for new ioctls and so forth. We use the head
__elv_add_request(q, req, ELEVATOR_INSERT_SORT, 0);
}
-/*
- * disk_round_stats() - Round off the performance stats on a struct
+static void part_round_stats_single(int cpu, struct hd_struct *part,
+ unsigned long now)
+{
+ if (now == part->stamp)
+ return;
+
+ if (part->in_flight) {
+ __part_stat_add(cpu, part, time_in_queue,
+ part->in_flight * (now - part->stamp));
+ __part_stat_add(cpu, part, io_ticks, (now - part->stamp));
+ }
+ part->stamp = now;
+}
+
+/**
+ * part_round_stats() - Round off the performance stats on a struct
* disk_stats.
*
* The average IO queue length and utilisation statistics are maintained
* /proc/diskstats. This accounts immediately for all queue usage up to
* the current jiffies and restarts the counters again.
*/
-void disk_round_stats(struct gendisk *disk)
+void part_round_stats(int cpu, struct hd_struct *part)
{
unsigned long now = jiffies;
- if (now == disk->stamp)
- return;
-
- if (disk->in_flight) {
- __disk_stat_add(disk, time_in_queue,
- disk->in_flight * (now - disk->stamp));
- __disk_stat_add(disk, io_ticks, (now - disk->stamp));
- }
- disk->stamp = now;
-}
-EXPORT_SYMBOL_GPL(disk_round_stats);
-
-void part_round_stats(struct hd_struct *part)
-{
- unsigned long now = jiffies;
-
- if (now == part->stamp)
- return;
-
- if (part->in_flight) {
- __part_stat_add(part, time_in_queue,
- part->in_flight * (now - part->stamp));
- __part_stat_add(part, io_ticks, (now - part->stamp));
- }
- part->stamp = now;
+ if (part->partno)
+ part_round_stats_single(cpu, &part_to_disk(part)->part0, now);
+ part_round_stats_single(cpu, part, now);
}
+EXPORT_SYMBOL_GPL(part_round_stats);
/*
* queue lock must be held
void init_request_from_bio(struct request *req, struct bio *bio)
{
+ req->cpu = bio->bi_comp_cpu;
req->cmd_type = REQ_TYPE_FS;
/*
/*
* REQ_BARRIER implies no merging, but lets make it explicit
*/
- if (unlikely(bio_barrier(bio)))
+ if (unlikely(bio_discard(bio))) {
+ req->cmd_flags |= REQ_DISCARD;
+ if (bio_barrier(bio))
+ req->cmd_flags |= REQ_SOFTBARRIER;
+ req->q->prepare_discard_fn(req->q, req);
+ } else if (unlikely(bio_barrier(bio)))
req->cmd_flags |= (REQ_HARDBARRIER | REQ_NOMERGE);
if (bio_sync(bio))
static int __make_request(struct request_queue *q, struct bio *bio)
{
struct request *req;
- int el_ret, nr_sectors, barrier, err;
+ int el_ret, nr_sectors, barrier, discard, err;
const unsigned short prio = bio_prio(bio);
const int sync = bio_sync(bio);
int rw_flags;
blk_queue_bounce(q, &bio);
barrier = bio_barrier(bio);
- if (unlikely(barrier) && (q->next_ordered == QUEUE_ORDERED_NONE)) {
+ if (unlikely(barrier) && bio_has_data(bio) &&
+ (q->next_ordered == QUEUE_ORDERED_NONE)) {
+ err = -EOPNOTSUPP;
+ goto end_io;
+ }
+
+ discard = bio_discard(bio);
+ if (unlikely(discard) && !q->prepare_discard_fn) {
err = -EOPNOTSUPP;
goto end_io;
}
req->biotail = bio;
req->nr_sectors = req->hard_nr_sectors += nr_sectors;
req->ioprio = ioprio_best(req->ioprio, prio);
+ if (!blk_rq_cpu_valid(req))
+ req->cpu = bio->bi_comp_cpu;
drive_stat_acct(req, 0);
if (!attempt_back_merge(q, req))
elv_merged_request(q, req, el_ret);
req->sector = req->hard_sector = bio->bi_sector;
req->nr_sectors = req->hard_nr_sectors += nr_sectors;
req->ioprio = ioprio_best(req->ioprio, prio);
+ if (!blk_rq_cpu_valid(req))
+ req->cpu = bio->bi_comp_cpu;
drive_stat_acct(req, 0);
if (!attempt_front_merge(q, req))
elv_merged_request(q, req, el_ret);
init_request_from_bio(req, bio);
spin_lock_irq(q->queue_lock);
+ if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags) ||
+ bio_flagged(bio, BIO_CPU_AFFINE))
+ req->cpu = blk_cpu_to_group(smp_processor_id());
if (elv_queue_empty(q))
blk_plug_device(q);
add_request(q, req);
out:
if (sync)
__generic_unplug_device(q);
-
spin_unlock_irq(q->queue_lock);
return 0;
static int should_fail_request(struct bio *bio)
{
- if ((bio->bi_bdev->bd_disk->flags & GENHD_FL_FAIL) ||
- (bio->bi_bdev->bd_part && bio->bi_bdev->bd_part->make_it_fail))
+ struct hd_struct *part = bio->bi_bdev->bd_part;
+
+ if (part_to_disk(part)->part0.make_it_fail || part->make_it_fail)
return should_fail(&fail_make_request, bio->bi_size);
return 0;
}
/**
- * generic_make_request: hand a buffer to its device driver for I/O
+ * generic_make_request - hand a buffer to its device driver for I/O
* @bio: The bio describing the location in memory and on the device.
*
* generic_make_request() is used to make I/O requests of block
if (bio_check_eod(bio, nr_sectors))
goto end_io;
- if (bio_empty_barrier(bio) && !q->prepare_flush_fn) {
+ if ((bio_empty_barrier(bio) && !q->prepare_flush_fn) ||
+ (bio_discard(bio) && !q->prepare_discard_fn)) {
err = -EOPNOTSUPP;
goto end_io;
}
EXPORT_SYMBOL(generic_make_request);
/**
- * submit_bio: submit a bio to the block device layer for I/O
+ * submit_bio - submit a bio to the block device layer for I/O
* @rw: whether to %READ or %WRITE, or maybe to %READA (read ahead)
* @bio: The &struct bio which describes the I/O
*
* submit_bio() is very similar in purpose to generic_make_request(), and
* uses that function to do most of the work. Both are fairly rough
- * interfaces, @bio must be presetup and ready for I/O.
+ * interfaces; @bio must be presetup and ready for I/O.
*
*/
void submit_bio(int rw, struct bio *bio)
* If it's a regular read/write or a barrier with data attached,
* go through the normal accounting stuff before submission.
*/
- if (!bio_empty_barrier(bio)) {
-
- BIO_BUG_ON(!bio->bi_size);
- BIO_BUG_ON(!bio->bi_io_vec);
-
+ if (bio_has_data(bio)) {
if (rw & WRITE) {
count_vm_events(PGPGOUT, count);
} else {
}
EXPORT_SYMBOL(submit_bio);
+/**
+ * blk_rq_check_limits - Helper function to check a request for the queue limit
+ * @q: the queue
+ * @rq: the request being checked
+ *
+ * Description:
+ * @rq may have been made based on weaker limitations of upper-level queues
+ * in request stacking drivers, and it may violate the limitation of @q.
+ * Since the block layer and the underlying device driver trust @rq
+ * after it is inserted to @q, it should be checked against @q before
+ * the insertion using this generic function.
+ *
+ * This function should also be useful for request stacking drivers
+ * in some cases below, so export this fuction.
+ * Request stacking drivers like request-based dm may change the queue
+ * limits while requests are in the queue (e.g. dm's table swapping).
+ * Such request stacking drivers should check those requests agaist
+ * the new queue limits again when they dispatch those requests,
+ * although such checkings are also done against the old queue limits
+ * when submitting requests.
+ */
+int blk_rq_check_limits(struct request_queue *q, struct request *rq)
+{
+ if (rq->nr_sectors > q->max_sectors ||
+ rq->data_len > q->max_hw_sectors << 9) {
+ printk(KERN_ERR "%s: over max size limit.\n", __func__);
+ return -EIO;
+ }
+
+ /*
+ * queue's settings related to segment counting like q->bounce_pfn
+ * may differ from that of other stacking queues.
+ * Recalculate it to check the request correctly on this queue's
+ * limitation.
+ */
+ blk_recalc_rq_segments(rq);
+ if (rq->nr_phys_segments > q->max_phys_segments ||
+ rq->nr_phys_segments > q->max_hw_segments) {
+ printk(KERN_ERR "%s: over max segments limit.\n", __func__);
+ return -EIO;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(blk_rq_check_limits);
+
+/**
+ * blk_insert_cloned_request - Helper for stacking drivers to submit a request
+ * @q: the queue to submit the request
+ * @rq: the request being queued
+ */
+int blk_insert_cloned_request(struct request_queue *q, struct request *rq)
+{
+ unsigned long flags;
+
+ if (blk_rq_check_limits(q, rq))
+ return -EIO;
+
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+ if (rq->rq_disk && rq->rq_disk->part0.make_it_fail &&
+ should_fail(&fail_make_request, blk_rq_bytes(rq)))
+ return -EIO;
+#endif
+
+ spin_lock_irqsave(q->queue_lock, flags);
+
+ /*
+ * Submitting request must be dequeued before calling this function
+ * because it will be linked to another request_queue
+ */
+ BUG_ON(blk_queued_rq(rq));
+
+ drive_stat_acct(rq, 1);
+ __elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 0);
+
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(blk_insert_cloned_request);
+
/**
* __end_that_request_first - end I/O on a request
* @req: the request being processed
- * @error: 0 for success, < 0 for error
+ * @error: %0 for success, < %0 for error
* @nr_bytes: number of bytes to complete
*
* Description:
* for the next range of segments (if any) in the cluster.
*
* Return:
- * 0 - we are done with this request, call end_that_request_last()
- * 1 - still buffers pending for this request
+ * %0 - we are done with this request, call end_that_request_last()
+ * %1 - still buffers pending for this request
**/
static int __end_that_request_first(struct request *req, int error,
int nr_bytes)
blk_add_trace_rq(req->q, req, BLK_TA_COMPLETE);
/*
- * for a REQ_BLOCK_PC request, we want to carry any eventual
+ * for a REQ_TYPE_BLOCK_PC request, we want to carry any eventual
* sense key with us all the way through
*/
if (!blk_pc_request(req))
}
if (blk_fs_request(req) && req->rq_disk) {
- struct hd_struct *part = get_part(req->rq_disk, req->sector);
const int rw = rq_data_dir(req);
+ struct hd_struct *part;
+ int cpu;
- all_stat_add(req->rq_disk, part, sectors[rw],
- nr_bytes >> 9, req->sector);
+ cpu = part_stat_lock();
+ part = disk_map_sector_rcu(req->rq_disk, req->sector);
+ part_stat_add(cpu, part, sectors[rw], nr_bytes >> 9);
+ part_stat_unlock();
}
total_bytes = bio_nbytes = 0;
return 1;
}
-/*
- * splice the completion data to a local structure and hand off to
- * process_completion_queue() to complete the requests
- */
-static void blk_done_softirq(struct softirq_action *h)
-{
- struct list_head *cpu_list, local_list;
-
- local_irq_disable();
- cpu_list = &__get_cpu_var(blk_cpu_done);
- list_replace_init(cpu_list, &local_list);
- local_irq_enable();
-
- while (!list_empty(&local_list)) {
- struct request *rq;
-
- rq = list_entry(local_list.next, struct request, donelist);
- list_del_init(&rq->donelist);
- rq->q->softirq_done_fn(rq);
- }
-}
-
-static int __cpuinit blk_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu)
-{
- /*
- * If a CPU goes away, splice its entries to the current CPU
- * and trigger a run of the softirq
- */
- if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
- int cpu = (unsigned long) hcpu;
-
- local_irq_disable();
- list_splice_init(&per_cpu(blk_cpu_done, cpu),
- &__get_cpu_var(blk_cpu_done));
- raise_softirq_irqoff(BLOCK_SOFTIRQ);
- local_irq_enable();
- }
-
- return NOTIFY_OK;
-}
-
-
-static struct notifier_block blk_cpu_notifier __cpuinitdata = {
- .notifier_call = blk_cpu_notify,
-};
-
-/**
- * blk_complete_request - end I/O on a request
- * @req: the request being processed
- *
- * Description:
- * Ends all I/O on a request. It does not handle partial completions,
- * unless the driver actually implements this in its completion callback
- * through requeueing. The actual completion happens out-of-order,
- * through a softirq handler. The user must have registered a completion
- * callback through blk_queue_softirq_done().
- **/
-
-void blk_complete_request(struct request *req)
-{
- struct list_head *cpu_list;
- unsigned long flags;
-
- BUG_ON(!req->q->softirq_done_fn);
-
- local_irq_save(flags);
-
- cpu_list = &__get_cpu_var(blk_cpu_done);
- list_add_tail(&req->donelist, cpu_list);
- raise_softirq_irqoff(BLOCK_SOFTIRQ);
-
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL(blk_complete_request);
-
/*
* queue lock must be held
*/
{
struct gendisk *disk = req->rq_disk;
+ blk_delete_timer(req);
+
if (blk_rq_tagged(req))
blk_queue_end_tag(req->q, req);
if (disk && blk_fs_request(req) && req != &req->q->bar_rq) {
unsigned long duration = jiffies - req->start_time;
const int rw = rq_data_dir(req);
- struct hd_struct *part = get_part(disk, req->sector);
-
- __all_stat_inc(disk, part, ios[rw], req->sector);
- __all_stat_add(disk, part, ticks[rw], duration, req->sector);
- disk_round_stats(disk);
- disk->in_flight--;
- if (part) {
- part_round_stats(part);
- part->in_flight--;
- }
+ struct hd_struct *part;
+ int cpu;
+
+ cpu = part_stat_lock();
+ part = disk_map_sector_rcu(disk, req->sector);
+
+ part_stat_inc(cpu, part, ios[rw]);
+ part_stat_add(cpu, part, ticks[rw], duration);
+ part_round_stats(cpu, part);
+ part_dec_in_flight(part);
+
+ part_stat_unlock();
}
if (req->end_io)
}
}
-static inline void __end_request(struct request *rq, int uptodate,
- unsigned int nr_bytes)
-{
- int error = 0;
-
- if (uptodate <= 0)
- error = uptodate ? uptodate : -EIO;
-
- __blk_end_request(rq, error, nr_bytes);
-}
-
/**
* blk_rq_bytes - Returns bytes left to complete in the entire request
* @rq: the request being processed
}
EXPORT_SYMBOL_GPL(blk_rq_cur_bytes);
-/**
- * end_queued_request - end all I/O on a queued request
- * @rq: the request being processed
- * @uptodate: error value or 0/1 uptodate flag
- *
- * Description:
- * Ends all I/O on a request, and removes it from the block layer queues.
- * Not suitable for normal IO completion, unless the driver still has
- * the request attached to the block layer.
- *
- **/
-void end_queued_request(struct request *rq, int uptodate)
-{
- __end_request(rq, uptodate, blk_rq_bytes(rq));
-}
-EXPORT_SYMBOL(end_queued_request);
-
-/**
- * end_dequeued_request - end all I/O on a dequeued request
- * @rq: the request being processed
- * @uptodate: error value or 0/1 uptodate flag
- *
- * Description:
- * Ends all I/O on a request. The request must already have been
- * dequeued using blkdev_dequeue_request(), as is normally the case
- * for most drivers.
- *
- **/
-void end_dequeued_request(struct request *rq, int uptodate)
-{
- __end_request(rq, uptodate, blk_rq_bytes(rq));
-}
-EXPORT_SYMBOL(end_dequeued_request);
-
-
/**
* end_request - end I/O on the current segment of the request
* @req: the request being processed
- * @uptodate: error value or 0/1 uptodate flag
+ * @uptodate: error value or %0/%1 uptodate flag
*
* Description:
* Ends I/O on the current segment of a request. If that is the only
* remaining segment, the request is also completed and freed.
*
- * This is a remnant of how older block drivers handled IO completions.
- * Modern drivers typically end IO on the full request in one go, unless
+ * This is a remnant of how older block drivers handled I/O completions.
+ * Modern drivers typically end I/O on the full request in one go, unless
* they have a residual value to account for. For that case this function
* isn't really useful, unless the residual just happens to be the
* full current segment. In other words, don't use this function in new
- * code. Either use end_request_completely(), or the
- * end_that_request_chunk() (along with end_that_request_last()) for
- * partial completions.
- *
+ * code. Use blk_end_request() or __blk_end_request() to end a request.
**/
void end_request(struct request *req, int uptodate)
{
- __end_request(req, uptodate, req->hard_cur_sectors << 9);
+ int error = 0;
+
+ if (uptodate <= 0)
+ error = uptodate ? uptodate : -EIO;
+
+ __blk_end_request(req, error, req->hard_cur_sectors << 9);
}
EXPORT_SYMBOL(end_request);
+static int end_that_request_data(struct request *rq, int error,
+ unsigned int nr_bytes, unsigned int bidi_bytes)
+{
+ if (rq->bio) {
+ if (__end_that_request_first(rq, error, nr_bytes))
+ return 1;
+
+ /* Bidi request must be completed as a whole */
+ if (blk_bidi_rq(rq) &&
+ __end_that_request_first(rq->next_rq, error, bidi_bytes))
+ return 1;
+ }
+
+ return 0;
+}
+
/**
* blk_end_io - Generic end_io function to complete a request.
* @rq: the request being processed
- * @error: 0 for success, < 0 for error
+ * @error: %0 for success, < %0 for error
* @nr_bytes: number of bytes to complete @rq
* @bidi_bytes: number of bytes to complete @rq->next_rq
* @drv_callback: function called between completion of bios in the request
* and completion of the request.
- * If the callback returns non 0, this helper returns without
+ * If the callback returns non %0, this helper returns without
* completion of the request.
*
* Description:
* If @rq has leftover, sets it up for the next range of segments.
*
* Return:
- * 0 - we are done with this request
- * 1 - this request is not freed yet, it still has pending buffers.
+ * %0 - we are done with this request
+ * %1 - this request is not freed yet, it still has pending buffers.
**/
static int blk_end_io(struct request *rq, int error, unsigned int nr_bytes,
unsigned int bidi_bytes,
struct request_queue *q = rq->q;
unsigned long flags = 0UL;
- if (blk_fs_request(rq) || blk_pc_request(rq)) {
- if (__end_that_request_first(rq, error, nr_bytes))
- return 1;
-
- /* Bidi request must be completed as a whole */
- if (blk_bidi_rq(rq) &&
- __end_that_request_first(rq->next_rq, error, bidi_bytes))
- return 1;
- }
+ if (end_that_request_data(rq, error, nr_bytes, bidi_bytes))
+ return 1;
/* Special feature for tricky drivers */
if (drv_callback && drv_callback(rq))
/**
* blk_end_request - Helper function for drivers to complete the request.
* @rq: the request being processed
- * @error: 0 for success, < 0 for error
+ * @error: %0 for success, < %0 for error
* @nr_bytes: number of bytes to complete
*
* Description:
* If @rq has leftover, sets it up for the next range of segments.
*
* Return:
- * 0 - we are done with this request
- * 1 - still buffers pending for this request
+ * %0 - we are done with this request
+ * %1 - still buffers pending for this request
**/
int blk_end_request(struct request *rq, int error, unsigned int nr_bytes)
{
/**
* __blk_end_request - Helper function for drivers to complete the request.
* @rq: the request being processed
- * @error: 0 for success, < 0 for error
+ * @error: %0 for success, < %0 for error
* @nr_bytes: number of bytes to complete
*
* Description:
* Must be called with queue lock held unlike blk_end_request().
*
* Return:
- * 0 - we are done with this request
- * 1 - still buffers pending for this request
+ * %0 - we are done with this request
+ * %1 - still buffers pending for this request
**/
int __blk_end_request(struct request *rq, int error, unsigned int nr_bytes)
{
- if (blk_fs_request(rq) || blk_pc_request(rq)) {
- if (__end_that_request_first(rq, error, nr_bytes))
- return 1;
- }
+ if (rq->bio && __end_that_request_first(rq, error, nr_bytes))
+ return 1;
add_disk_randomness(rq->rq_disk);
/**
* blk_end_bidi_request - Helper function for drivers to complete bidi request.
* @rq: the bidi request being processed
- * @error: 0 for success, < 0 for error
+ * @error: %0 for success, < %0 for error
* @nr_bytes: number of bytes to complete @rq
* @bidi_bytes: number of bytes to complete @rq->next_rq
*
* Ends I/O on a number of bytes attached to @rq and @rq->next_rq.
*
* Return:
- * 0 - we are done with this request
- * 1 - still buffers pending for this request
+ * %0 - we are done with this request
+ * %1 - still buffers pending for this request
**/
int blk_end_bidi_request(struct request *rq, int error, unsigned int nr_bytes,
unsigned int bidi_bytes)
}
EXPORT_SYMBOL_GPL(blk_end_bidi_request);
+/**
+ * blk_update_request - Special helper function for request stacking drivers
+ * @rq: the request being processed
+ * @error: %0 for success, < %0 for error
+ * @nr_bytes: number of bytes to complete @rq
+ *
+ * Description:
+ * Ends I/O on a number of bytes attached to @rq, but doesn't complete
+ * the request structure even if @rq doesn't have leftover.
+ * If @rq has leftover, sets it up for the next range of segments.
+ *
+ * This special helper function is only for request stacking drivers
+ * (e.g. request-based dm) so that they can handle partial completion.
+ * Actual device drivers should use blk_end_request instead.
+ */
+void blk_update_request(struct request *rq, int error, unsigned int nr_bytes)
+{
+ if (!end_that_request_data(rq, error, nr_bytes, 0)) {
+ /*
+ * These members are not updated in end_that_request_data()
+ * when all bios are completed.
+ * Update them so that the request stacking driver can find
+ * how many bytes remain in the request later.
+ */
+ rq->nr_sectors = rq->hard_nr_sectors = 0;
+ rq->current_nr_sectors = rq->hard_cur_sectors = 0;
+ }
+}
+EXPORT_SYMBOL_GPL(blk_update_request);
+
/**
* blk_end_request_callback - Special helper function for tricky drivers
* @rq: the request being processed
- * @error: 0 for success, < 0 for error
+ * @error: %0 for success, < %0 for error
* @nr_bytes: number of bytes to complete
* @drv_callback: function called between completion of bios in the request
* and completion of the request.
- * If the callback returns non 0, this helper returns without
+ * If the callback returns non %0, this helper returns without
* completion of the request.
*
* Description:
* Don't use this interface in other places anymore.
*
* Return:
- * 0 - we are done with this request
- * 1 - this request is not freed yet.
- * this request still has pending buffers or
- * the driver doesn't want to finish this request yet.
+ * %0 - we are done with this request
+ * %1 - this request is not freed yet.
+ * this request still has pending buffers or
+ * the driver doesn't want to finish this request yet.
**/
int blk_end_request_callback(struct request *rq, int error,
unsigned int nr_bytes,
void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
struct bio *bio)
{
- /* first two bits are identical in rq->cmd_flags and bio->bi_rw */
+ /* Bit 0 (R/W) is identical in rq->cmd_flags and bio->bi_rw, and
+ we want BIO_RW_AHEAD (bit 1) to imply REQ_FAILFAST (bit 1). */
rq->cmd_flags |= (bio->bi_rw & 3);
- rq->nr_phys_segments = bio_phys_segments(q, bio);
- rq->nr_hw_segments = bio_hw_segments(q, bio);
+ if (bio_has_data(bio)) {
+ rq->nr_phys_segments = bio_phys_segments(q, bio);
+ rq->buffer = bio_data(bio);
+ }
rq->current_nr_sectors = bio_cur_sectors(bio);
rq->hard_cur_sectors = rq->current_nr_sectors;
rq->hard_nr_sectors = rq->nr_sectors = bio_sectors(bio);
- rq->buffer = bio_data(bio);
rq->data_len = bio->bi_size;
rq->bio = rq->biotail = bio;
rq->rq_disk = bio->bi_bdev->bd_disk;
}
-int kblockd_schedule_work(struct work_struct *work)
+/**
+ * blk_lld_busy - Check if underlying low-level drivers of a device are busy
+ * @q : the queue of the device being checked
+ *
+ * Description:
+ * Check if underlying low-level drivers of a device are busy.
+ * If the drivers want to export their busy state, they must set own
+ * exporting function using blk_queue_lld_busy() first.
+ *
+ * Basically, this function is used only by request stacking drivers
+ * to stop dispatching requests to underlying devices when underlying
+ * devices are busy. This behavior helps more I/O merging on the queue
+ * of the request stacking driver and prevents I/O throughput regression
+ * on burst I/O load.
+ *
+ * Return:
+ * 0 - Not busy (The request stacking driver should dispatch request)
+ * 1 - Busy (The request stacking driver should stop dispatching request)
+ */
+int blk_lld_busy(struct request_queue *q)
+{
+ if (q->lld_busy_fn)
+ return q->lld_busy_fn(q);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(blk_lld_busy);
+
+int kblockd_schedule_work(struct request_queue *q, struct work_struct *work)
{
return queue_work(kblockd_workqueue, work);
}
int __init blk_dev_init(void)
{
- int i;
-
kblockd_workqueue = create_workqueue("kblockd");
if (!kblockd_workqueue)
panic("Failed to create kblockd\n");
blk_requestq_cachep = kmem_cache_create("blkdev_queue",
sizeof(struct request_queue), 0, SLAB_PANIC, NULL);
- for_each_possible_cpu(i)
- INIT_LIST_HEAD(&per_cpu(blk_cpu_done, i));
-
- open_softirq(BLOCK_SOFTIRQ, blk_done_softirq);
- register_hotcpu_notifier(&blk_cpu_notifier);
-
return 0;
}
/**
* blk_end_sync_rq - executes a completion event on a request
* @rq: request to complete
- * @error: end io status of the request
+ * @error: end I/O status of the request
*/
static void blk_end_sync_rq(struct request *rq, int error)
{
* @done: I/O completion handler
*
* Description:
- * Insert a fully prepared request at the back of the io scheduler queue
+ * Insert a fully prepared request at the back of the I/O scheduler queue
* for execution. Don't wait for completion.
*/
void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
* @at_head: insert request at head or tail of queue
*
* Description:
- * Insert a fully prepared request at the back of the io scheduler queue
+ * Insert a fully prepared request at the back of the I/O scheduler queue
* for execution and wait for completion.
*/
int blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk,
EXPORT_SYMBOL(blk_rq_map_integrity_sg);
/**
- * blk_integrity_compare - Compare integrity profile of two block devices
- * @b1: Device to compare
- * @b2: Device to compare
+ * blk_integrity_compare - Compare integrity profile of two disks
+ * @gd1: Disk to compare
+ * @gd2: Disk to compare
*
* Description: Meta-devices like DM and MD need to verify that all
* sub-devices use the same integrity format before advertising to
* upper layers that they can send/receive integrity metadata. This
- * function can be used to check whether two block devices have
+ * function can be used to check whether two gendisk devices have
* compatible integrity formats.
*/
-int blk_integrity_compare(struct block_device *bd1, struct block_device *bd2)
+int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2)
{
- struct blk_integrity *b1 = bd1->bd_disk->integrity;
- struct blk_integrity *b2 = bd2->bd_disk->integrity;
+ struct blk_integrity *b1 = gd1->integrity;
+ struct blk_integrity *b2 = gd2->integrity;
- BUG_ON(bd1->bd_disk == NULL);
- BUG_ON(bd2->bd_disk == NULL);
+ if (!b1 && !b2)
+ return 0;
if (!b1 || !b2)
- return 0;
+ return -1;
if (b1->sector_size != b2->sector_size) {
printk(KERN_ERR "%s: %s/%s sector sz %u != %u\n", __func__,
- bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
+ gd1->disk_name, gd2->disk_name,
b1->sector_size, b2->sector_size);
return -1;
}
if (b1->tuple_size != b2->tuple_size) {
printk(KERN_ERR "%s: %s/%s tuple sz %u != %u\n", __func__,
- bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
+ gd1->disk_name, gd2->disk_name,
b1->tuple_size, b2->tuple_size);
return -1;
}
if (b1->tag_size && b2->tag_size && (b1->tag_size != b2->tag_size)) {
printk(KERN_ERR "%s: %s/%s tag sz %u != %u\n", __func__,
- bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
+ gd1->disk_name, gd2->disk_name,
b1->tag_size, b2->tag_size);
return -1;
}
if (strcmp(b1->name, b2->name)) {
printk(KERN_ERR "%s: %s/%s type %s != %s\n", __func__,
- bd1->bd_disk->disk_name, bd2->bd_disk->disk_name,
+ gd1->disk_name, gd2->disk_name,
b1->name, b2->name);
return -1;
}
return -1;
if (kobject_init_and_add(&bi->kobj, &integrity_ktype,
- &disk->dev.kobj, "%s", "integrity")) {
+ &disk_to_dev(disk)->kobj,
+ "%s", "integrity")) {
kmem_cache_free(integrity_cachep, bi);
return -1;
}
kobject_uevent(&bi->kobj, KOBJ_REMOVE);
kobject_del(&bi->kobj);
- kobject_put(&disk->dev.kobj);
kmem_cache_free(integrity_cachep, bi);
+ disk->integrity = NULL;
}
EXPORT_SYMBOL(blk_integrity_unregister);
}
static int __blk_rq_map_user(struct request_queue *q, struct request *rq,
- void __user *ubuf, unsigned int len)
+ struct rq_map_data *map_data, void __user *ubuf,
+ unsigned int len, int null_mapped, gfp_t gfp_mask)
{
unsigned long uaddr;
- unsigned int alignment;
struct bio *bio, *orig_bio;
int reading, ret;
* direct dma. else, set up kernel bounce buffers
*/
uaddr = (unsigned long) ubuf;
- alignment = queue_dma_alignment(q) | q->dma_pad_mask;
- if (!(uaddr & alignment) && !(len & alignment))
- bio = bio_map_user(q, NULL, uaddr, len, reading);
+ if (blk_rq_aligned(q, ubuf, len) && !map_data)
+ bio = bio_map_user(q, NULL, uaddr, len, reading, gfp_mask);
else
- bio = bio_copy_user(q, uaddr, len, reading);
+ bio = bio_copy_user(q, map_data, uaddr, len, reading, gfp_mask);
if (IS_ERR(bio))
return PTR_ERR(bio);
+ if (null_mapped)
+ bio->bi_flags |= (1 << BIO_NULL_MAPPED);
+
orig_bio = bio;
blk_queue_bounce(q, &bio);
}
/**
- * blk_rq_map_user - map user data to a request, for REQ_BLOCK_PC usage
+ * blk_rq_map_user - map user data to a request, for REQ_TYPE_BLOCK_PC usage
* @q: request queue where request should be inserted
* @rq: request structure to fill
+ * @map_data: pointer to the rq_map_data holding pages (if necessary)
* @ubuf: the user buffer
* @len: length of user data
+ * @gfp_mask: memory allocation flags
*
* Description:
- * Data will be mapped directly for zero copy io, if possible. Otherwise
+ * Data will be mapped directly for zero copy I/O, if possible. Otherwise
* a kernel bounce buffer is used.
*
- * A matching blk_rq_unmap_user() must be issued at the end of io, while
+ * A matching blk_rq_unmap_user() must be issued at the end of I/O, while
* still in process context.
*
* Note: The mapped bio may need to be bounced through blk_queue_bounce()
* unmapping.
*/
int blk_rq_map_user(struct request_queue *q, struct request *rq,
- void __user *ubuf, unsigned long len)
+ struct rq_map_data *map_data, void __user *ubuf,
+ unsigned long len, gfp_t gfp_mask)
{
unsigned long bytes_read = 0;
struct bio *bio = NULL;
- int ret;
+ int ret, null_mapped = 0;
if (len > (q->max_hw_sectors << 9))
return -EINVAL;
- if (!len || !ubuf)
+ if (!len)
return -EINVAL;
+ if (!ubuf) {
+ if (!map_data || rq_data_dir(rq) != READ)
+ return -EINVAL;
+ null_mapped = 1;
+ }
while (bytes_read != len) {
unsigned long map_len, end, start;
if (end - start > BIO_MAX_PAGES)
map_len -= PAGE_SIZE;
- ret = __blk_rq_map_user(q, rq, ubuf, map_len);
+ ret = __blk_rq_map_user(q, rq, map_data, ubuf, map_len,
+ null_mapped, gfp_mask);
if (ret < 0)
goto unmap_rq;
if (!bio)
EXPORT_SYMBOL(blk_rq_map_user);
/**
- * blk_rq_map_user_iov - map user data to a request, for REQ_BLOCK_PC usage
+ * blk_rq_map_user_iov - map user data to a request, for REQ_TYPE_BLOCK_PC usage
* @q: request queue where request should be inserted
* @rq: request to map data to
+ * @map_data: pointer to the rq_map_data holding pages (if necessary)
* @iov: pointer to the iovec
* @iov_count: number of elements in the iovec
* @len: I/O byte count
+ * @gfp_mask: memory allocation flags
*
* Description:
- * Data will be mapped directly for zero copy io, if possible. Otherwise
+ * Data will be mapped directly for zero copy I/O, if possible. Otherwise
* a kernel bounce buffer is used.
*
- * A matching blk_rq_unmap_user() must be issued at the end of io, while
+ * A matching blk_rq_unmap_user() must be issued at the end of I/O, while
* still in process context.
*
* Note: The mapped bio may need to be bounced through blk_queue_bounce()
* unmapping.
*/
int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
- struct sg_iovec *iov, int iov_count, unsigned int len)
+ struct rq_map_data *map_data, struct sg_iovec *iov,
+ int iov_count, unsigned int len, gfp_t gfp_mask)
{
struct bio *bio;
int i, read = rq_data_dir(rq) == READ;
}
}
- if (unaligned || (q->dma_pad_mask & len))
- bio = bio_copy_user_iov(q, iov, iov_count, read);
+ if (unaligned || (q->dma_pad_mask & len) || map_data)
+ bio = bio_copy_user_iov(q, map_data, iov, iov_count, read,
+ gfp_mask);
else
- bio = bio_map_user_iov(q, NULL, iov, iov_count, read);
+ bio = bio_map_user_iov(q, NULL, iov, iov_count, read, gfp_mask);
if (IS_ERR(bio))
return PTR_ERR(bio);
rq->buffer = rq->data = NULL;
return 0;
}
+EXPORT_SYMBOL(blk_rq_map_user_iov);
/**
* blk_rq_unmap_user - unmap a request with user data
* Description:
* Unmap a rq previously mapped by blk_rq_map_user(). The caller must
* supply the original rq->bio from the blk_rq_map_user() return, since
- * the io completion may have changed rq->bio.
+ * the I/O completion may have changed rq->bio.
*/
int blk_rq_unmap_user(struct bio *bio)
{
EXPORT_SYMBOL(blk_rq_unmap_user);
/**
- * blk_rq_map_kern - map kernel data to a request, for REQ_BLOCK_PC usage
+ * blk_rq_map_kern - map kernel data to a request, for REQ_TYPE_BLOCK_PC usage
* @q: request queue where request should be inserted
* @rq: request to fill
* @kbuf: the kernel buffer
int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
unsigned int len, gfp_t gfp_mask)
{
- unsigned long kaddr;
- unsigned int alignment;
int reading = rq_data_dir(rq) == READ;
int do_copy = 0;
struct bio *bio;
if (!len || !kbuf)
return -EINVAL;
- kaddr = (unsigned long)kbuf;
- alignment = queue_dma_alignment(q) | q->dma_pad_mask;
- do_copy = ((kaddr & alignment) || (len & alignment) ||
- object_is_on_stack(kbuf));
-
+ do_copy = !blk_rq_aligned(q, kbuf, len) || object_is_on_stack(kbuf);
if (do_copy)
bio = bio_copy_kern(q, kbuf, len, gfp_mask, reading);
else
void blk_recalc_rq_sectors(struct request *rq, int nsect)
{
- if (blk_fs_request(rq)) {
+ if (blk_fs_request(rq) || blk_discard_rq(rq)) {
rq->hard_sector += nsect;
rq->hard_nr_sectors -= nsect;
void blk_recalc_rq_segments(struct request *rq)
{
int nr_phys_segs;
- int nr_hw_segs;
unsigned int phys_size;
- unsigned int hw_size;
struct bio_vec *bv, *bvprv = NULL;
int seg_size;
- int hw_seg_size;
int cluster;
struct req_iterator iter;
int high, highprv = 1;
return;
cluster = test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
- hw_seg_size = seg_size = 0;
- phys_size = hw_size = nr_phys_segs = nr_hw_segs = 0;
+ seg_size = 0;
+ phys_size = nr_phys_segs = 0;
rq_for_each_segment(bv, rq, iter) {
/*
* the trick here is making sure that a high page is never
*/
high = page_to_pfn(bv->bv_page) > q->bounce_pfn;
if (high || highprv)
- goto new_hw_segment;
+ goto new_segment;
if (cluster) {
if (seg_size + bv->bv_len > q->max_segment_size)
goto new_segment;
goto new_segment;
if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bv))
goto new_segment;
- if (BIOVEC_VIRT_OVERSIZE(hw_seg_size + bv->bv_len))
- goto new_hw_segment;
seg_size += bv->bv_len;
- hw_seg_size += bv->bv_len;
bvprv = bv;
continue;
}
new_segment:
- if (BIOVEC_VIRT_MERGEABLE(bvprv, bv) &&
- !BIOVEC_VIRT_OVERSIZE(hw_seg_size + bv->bv_len))
- hw_seg_size += bv->bv_len;
- else {
-new_hw_segment:
- if (nr_hw_segs == 1 &&
- hw_seg_size > rq->bio->bi_hw_front_size)
- rq->bio->bi_hw_front_size = hw_seg_size;
- hw_seg_size = BIOVEC_VIRT_START_SIZE(bv) + bv->bv_len;
- nr_hw_segs++;
- }
-
nr_phys_segs++;
bvprv = bv;
seg_size = bv->bv_len;
highprv = high;
}
- if (nr_hw_segs == 1 &&
- hw_seg_size > rq->bio->bi_hw_front_size)
- rq->bio->bi_hw_front_size = hw_seg_size;
- if (hw_seg_size > rq->biotail->bi_hw_back_size)
- rq->biotail->bi_hw_back_size = hw_seg_size;
rq->nr_phys_segments = nr_phys_segs;
- rq->nr_hw_segments = nr_hw_segs;
}
void blk_recount_segments(struct request_queue *q, struct bio *bio)
blk_recalc_rq_segments(&rq);
bio->bi_next = nxt;
bio->bi_phys_segments = rq.nr_phys_segments;
- bio->bi_hw_segments = rq.nr_hw_segments;
bio->bi_flags |= (1 << BIO_SEG_VALID);
}
EXPORT_SYMBOL(blk_recount_segments);
if (!test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags))
return 0;
- if (!BIOVEC_PHYS_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt)))
- return 0;
if (bio->bi_size + nxt->bi_size > q->max_segment_size)
return 0;
+ if (!bio_has_data(bio))
+ return 1;
+
+ if (!BIOVEC_PHYS_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt)))
+ return 0;
+
/*
- * bio and nxt are contigous in memory, check if the queue allows
+ * bio and nxt are contiguous in memory; check if the queue allows
* these two to be merged into one
*/
if (BIO_SEG_BOUNDARY(q, bio, nxt))
return 0;
}
-static int blk_hw_contig_segment(struct request_queue *q, struct bio *bio,
- struct bio *nxt)
-{
- if (!bio_flagged(bio, BIO_SEG_VALID))
- blk_recount_segments(q, bio);
- if (!bio_flagged(nxt, BIO_SEG_VALID))
- blk_recount_segments(q, nxt);
- if (!BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(nxt)) ||
- BIOVEC_VIRT_OVERSIZE(bio->bi_hw_back_size + nxt->bi_hw_front_size))
- return 0;
- if (bio->bi_hw_back_size + nxt->bi_hw_front_size > q->max_segment_size)
- return 0;
-
- return 1;
-}
-
/*
* map a request to scatterlist, return number of sg entries setup. Caller
* must make sure sg can hold rq->nr_phys_segments entries
struct request *req,
struct bio *bio)
{
- int nr_hw_segs = bio_hw_segments(q, bio);
int nr_phys_segs = bio_phys_segments(q, bio);
- if (req->nr_hw_segments + nr_hw_segs > q->max_hw_segments
+ if (req->nr_phys_segments + nr_phys_segs > q->max_hw_segments
|| req->nr_phys_segments + nr_phys_segs > q->max_phys_segments) {
req->cmd_flags |= REQ_NOMERGE;
if (req == q->last_merge)
* This will form the start of a new hw segment. Bump both
* counters.
*/
- req->nr_hw_segments += nr_hw_segs;
req->nr_phys_segments += nr_phys_segs;
return 1;
}
struct bio *bio)
{
unsigned short max_sectors;
- int len;
if (unlikely(blk_pc_request(req)))
max_sectors = q->max_hw_sectors;
blk_recount_segments(q, req->biotail);
if (!bio_flagged(bio, BIO_SEG_VALID))
blk_recount_segments(q, bio);
- len = req->biotail->bi_hw_back_size + bio->bi_hw_front_size;
- if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(req->biotail), __BVEC_START(bio))
- && !BIOVEC_VIRT_OVERSIZE(len)) {
- int mergeable = ll_new_mergeable(q, req, bio);
-
- if (mergeable) {
- if (req->nr_hw_segments == 1)
- req->bio->bi_hw_front_size = len;
- if (bio->bi_hw_segments == 1)
- bio->bi_hw_back_size = len;
- }
- return mergeable;
- }
return ll_new_hw_segment(q, req, bio);
}
struct bio *bio)
{
unsigned short max_sectors;
- int len;
if (unlikely(blk_pc_request(req)))
max_sectors = q->max_hw_sectors;
q->last_merge = NULL;
return 0;
}
- len = bio->bi_hw_back_size + req->bio->bi_hw_front_size;
if (!bio_flagged(bio, BIO_SEG_VALID))
blk_recount_segments(q, bio);
if (!bio_flagged(req->bio, BIO_SEG_VALID))
blk_recount_segments(q, req->bio);
- if (BIOVEC_VIRT_MERGEABLE(__BVEC_END(bio), __BVEC_START(req->bio)) &&
- !BIOVEC_VIRT_OVERSIZE(len)) {
- int mergeable = ll_new_mergeable(q, req, bio);
-
- if (mergeable) {
- if (bio->bi_hw_segments == 1)
- bio->bi_hw_front_size = len;
- if (req->nr_hw_segments == 1)
- req->biotail->bi_hw_back_size = len;
- }
- return mergeable;
- }
return ll_new_hw_segment(q, req, bio);
}
struct request *next)
{
int total_phys_segments;
- int total_hw_segments;
/*
* First check if the either of the requests are re-queued
if (total_phys_segments > q->max_phys_segments)
return 0;
- total_hw_segments = req->nr_hw_segments + next->nr_hw_segments;
- if (blk_hw_contig_segment(q, req->biotail, next->bio)) {
- int len = req->biotail->bi_hw_back_size +
- next->bio->bi_hw_front_size;
- /*
- * propagate the combined length to the end of the requests
- */
- if (req->nr_hw_segments == 1)
- req->bio->bi_hw_front_size = len;
- if (next->nr_hw_segments == 1)
- next->biotail->bi_hw_back_size = len;
- total_hw_segments--;
- }
-
- if (total_hw_segments > q->max_hw_segments)
+ if (total_phys_segments > q->max_hw_segments)
return 0;
/* Merge is OK... */
req->nr_phys_segments = total_phys_segments;
- req->nr_hw_segments = total_hw_segments;
return 1;
}
elv_merge_requests(q, req, next);
if (req->rq_disk) {
- struct hd_struct *part
- = get_part(req->rq_disk, req->sector);
- disk_round_stats(req->rq_disk);
- req->rq_disk->in_flight--;
- if (part) {
- part_round_stats(part);
- part->in_flight--;
- }
+ struct hd_struct *part;
+ int cpu;
+
+ cpu = part_stat_lock();
+ part = disk_map_sector_rcu(req->rq_disk, req->sector);
+
+ part_round_stats(cpu, part);
+ part_dec_in_flight(part);
+
+ part_stat_unlock();
}
req->ioprio = ioprio_best(req->ioprio, next->ioprio);
+ if (blk_rq_cpu_valid(next))
+ req->cpu = next->cpu;
__blk_put_request(q, next);
return 1;
}
EXPORT_SYMBOL(blk_queue_prep_rq);
+/**
+ * blk_queue_set_discard - set a discard_sectors function for queue
+ * @q: queue
+ * @dfn: prepare_discard function
+ *
+ * It's possible for a queue to register a discard callback which is used
+ * to transform a discard request into the appropriate type for the
+ * hardware. If none is registered, then discard requests are failed
+ * with %EOPNOTSUPP.
+ *
+ */
+void blk_queue_set_discard(struct request_queue *q, prepare_discard_fn *dfn)
+{
+ q->prepare_discard_fn = dfn;
+}
+EXPORT_SYMBOL(blk_queue_set_discard);
+
/**
* blk_queue_merge_bvec - set a merge_bvec function for queue
* @q: queue
}
EXPORT_SYMBOL(blk_queue_softirq_done);
+void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout)
+{
+ q->rq_timeout = timeout;
+}
+EXPORT_SYMBOL_GPL(blk_queue_rq_timeout);
+
+void blk_queue_rq_timed_out(struct request_queue *q, rq_timed_out_fn *fn)
+{
+ q->rq_timed_out_fn = fn;
+}
+EXPORT_SYMBOL_GPL(blk_queue_rq_timed_out);
+
+void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn)
+{
+ q->lld_busy_fn = fn;
+}
+EXPORT_SYMBOL_GPL(blk_queue_lld_busy);
+
/**
* blk_queue_make_request - define an alternate make_request function for a device
* @q: the request queue for the device to be affected
* Different hardware can have different requirements as to what pages
* it can do I/O directly to. A low level driver can call
* blk_queue_bounce_limit to have lower memory pages allocated as bounce
- * buffers for doing I/O to pages residing above @page.
+ * buffers for doing I/O to pages residing above @dma_addr.
**/
void blk_queue_bounce_limit(struct request_queue *q, u64 dma_addr)
{
* Description:
* Enables a low level driver to set an upper limit on the number of
* hw data segments in a request. This would be the largest number of
- * address/length pairs the host adapter can actually give as once
+ * address/length pairs the host adapter can actually give at once
* to the device.
**/
void blk_queue_max_hw_segments(struct request_queue *q,
* @mask: alignment mask
*
* description:
- * set required memory and length aligment for direct dma transactions.
+ * set required memory and length alignment for direct dma transactions.
* this is used when buiding direct io requests for the queue.
*
**/
* @mask: alignment mask
*
* description:
- * update required memory and length aligment for direct dma transactions.
+ * update required memory and length alignment for direct dma transactions.
* If the requested alignment is larger than the current alignment, then
* the current queue alignment is updated to the new value, otherwise it
* is left alone. The design of this is to allow multiple objects
--- /dev/null
+/*
+ * Functions related to softirq rq completions
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/cpu.h>
+
+#include "blk.h"
+
+static DEFINE_PER_CPU(struct list_head, blk_cpu_done);
+
+/*
+ * Softirq action handler - move entries to local list and loop over them
+ * while passing them to the queue registered handler.
+ */
+static void blk_done_softirq(struct softirq_action *h)
+{
+ struct list_head *cpu_list, local_list;
+
+ local_irq_disable();
+ cpu_list = &__get_cpu_var(blk_cpu_done);
+ list_replace_init(cpu_list, &local_list);
+ local_irq_enable();
+
+ while (!list_empty(&local_list)) {
+ struct request *rq;
+
+ rq = list_entry(local_list.next, struct request, csd.list);
+ list_del_init(&rq->csd.list);
+ rq->q->softirq_done_fn(rq);
+ }
+}
+
+#if defined(CONFIG_SMP) && defined(CONFIG_USE_GENERIC_SMP_HELPERS)
+static void trigger_softirq(void *data)
+{
+ struct request *rq = data;
+ unsigned long flags;
+ struct list_head *list;
+
+ local_irq_save(flags);
+ list = &__get_cpu_var(blk_cpu_done);
+ list_add_tail(&rq->csd.list, list);
+
+ if (list->next == &rq->csd.list)
+ raise_softirq_irqoff(BLOCK_SOFTIRQ);
+
+ local_irq_restore(flags);
+}
+
+/*
+ * Setup and invoke a run of 'trigger_softirq' on the given cpu.
+ */
+static int raise_blk_irq(int cpu, struct request *rq)
+{
+ if (cpu_online(cpu)) {
+ struct call_single_data *data = &rq->csd;
+
+ data->func = trigger_softirq;
+ data->info = rq;
+ data->flags = 0;
+
+ __smp_call_function_single(cpu, data);
+ return 0;
+ }
+
+ return 1;
+}
+#else /* CONFIG_SMP && CONFIG_USE_GENERIC_SMP_HELPERS */
+static int raise_blk_irq(int cpu, struct request *rq)
+{
+ return 1;
+}
+#endif
+
+static int __cpuinit blk_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+{
+ /*
+ * If a CPU goes away, splice its entries to the current CPU
+ * and trigger a run of the softirq
+ */
+ if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
+ int cpu = (unsigned long) hcpu;
+
+ local_irq_disable();
+ list_splice_init(&per_cpu(blk_cpu_done, cpu),
+ &__get_cpu_var(blk_cpu_done));
+ raise_softirq_irqoff(BLOCK_SOFTIRQ);
+ local_irq_enable();
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata blk_cpu_notifier = {
+ .notifier_call = blk_cpu_notify,
+};
+
+void __blk_complete_request(struct request *req)
+{
+ struct request_queue *q = req->q;
+ unsigned long flags;
+ int ccpu, cpu, group_cpu;
+
+ BUG_ON(!q->softirq_done_fn);
+
+ local_irq_save(flags);
+ cpu = smp_processor_id();
+ group_cpu = blk_cpu_to_group(cpu);
+
+ /*
+ * Select completion CPU
+ */
+ if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags) && req->cpu != -1)
+ ccpu = req->cpu;
+ else
+ ccpu = cpu;
+
+ if (ccpu == cpu || ccpu == group_cpu) {
+ struct list_head *list;
+do_local:
+ list = &__get_cpu_var(blk_cpu_done);
+ list_add_tail(&req->csd.list, list);
+
+ /*
+ * if the list only contains our just added request,
+ * signal a raise of the softirq. If there are already
+ * entries there, someone already raised the irq but it
+ * hasn't run yet.
+ */
+ if (list->next == &req->csd.list)
+ raise_softirq_irqoff(BLOCK_SOFTIRQ);
+ } else if (raise_blk_irq(ccpu, req))
+ goto do_local;
+
+ local_irq_restore(flags);
+}
+
+/**
+ * blk_complete_request - end I/O on a request
+ * @req: the request being processed
+ *
+ * Description:
+ * Ends all I/O on a request. It does not handle partial completions,
+ * unless the driver actually implements this in its completion callback
+ * through requeueing. The actual completion happens out-of-order,
+ * through a softirq handler. The user must have registered a completion
+ * callback through blk_queue_softirq_done().
+ **/
+void blk_complete_request(struct request *req)
+{
+ if (unlikely(blk_should_fake_timeout(req->q)))
+ return;
+ if (!blk_mark_rq_complete(req))
+ __blk_complete_request(req);
+}
+EXPORT_SYMBOL(blk_complete_request);
+
+__init int blk_softirq_init(void)
+{
+ int i;
+
+ for_each_possible_cpu(i)
+ INIT_LIST_HEAD(&per_cpu(blk_cpu_done, i));
+
+ open_softirq(BLOCK_SOFTIRQ, blk_done_softirq);
+ register_hotcpu_notifier(&blk_cpu_notifier);
+ return 0;
+}
+subsys_initcall(blk_softirq_init);
return ret;
}
+static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
+{
+ unsigned int set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
+
+ return queue_var_show(set != 0, page);
+}
+
+static ssize_t
+queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
+{
+ ssize_t ret = -EINVAL;
+#if defined(CONFIG_USE_GENERIC_SMP_HELPERS)
+ unsigned long val;
+
+ ret = queue_var_store(&val, page, count);
+ spin_lock_irq(q->queue_lock);
+ if (val)
+ queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
+ else
+ queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
+ spin_unlock_irq(q->queue_lock);
+#endif
+ return ret;
+}
static struct queue_sysfs_entry queue_requests_entry = {
.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
.store = queue_nomerges_store,
};
+static struct queue_sysfs_entry queue_rq_affinity_entry = {
+ .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR },
+ .show = queue_rq_affinity_show,
+ .store = queue_rq_affinity_store,
+};
+
static struct attribute *default_attrs[] = {
&queue_requests_entry.attr,
&queue_ra_entry.attr,
&queue_iosched_entry.attr,
&queue_hw_sector_size_entry.attr,
&queue_nomerges_entry.attr,
+ &queue_rq_affinity_entry.attr,
NULL,
};
if (!q->request_fn)
return 0;
- ret = kobject_add(&q->kobj, kobject_get(&disk->dev.kobj),
+ ret = kobject_add(&q->kobj, kobject_get(&disk_to_dev(disk)->kobj),
"%s", "queue");
if (ret < 0)
return ret;
kobject_uevent(&q->kobj, KOBJ_REMOVE);
kobject_del(&q->kobj);
- kobject_put(&disk->dev.kobj);
+ kobject_put(&disk_to_dev(disk)->kobj);
}
}
* __blk_free_tags - release a given set of tag maintenance info
* @bqt: the tag map to free
*
- * Tries to free the specified @bqt@. Returns true if it was
+ * Tries to free the specified @bqt. Returns true if it was
* actually freed and false if there are still references using it
*/
static int __blk_free_tags(struct blk_queue_tag *bqt)
* blk_free_tags - release a given set of tag maintenance info
* @bqt: the tag map to free
*
- * For externally managed @bqt@ frees the map. Callers of this
+ * For externally managed @bqt frees the map. Callers of this
* function must guarantee to have released all the queues that
* might have been using this tag map.
*/
* @q: the request queue for the device
*
* Notes:
- * This is used to disabled tagged queuing to a device, yet leave
+ * This is used to disable tagged queuing to a device, yet leave
* queue in function.
**/
void blk_queue_free_tags(struct request_queue *q)
* @rq: the request that has completed
*
* Description:
- * Typically called when end_that_request_first() returns 0, meaning
+ * Typically called when end_that_request_first() returns %0, meaning
* all transfers have been done for a request. It's important to call
* this function before end_that_request_last(), as that will put the
* request back on the free list thus corrupting the internal tag list.
int blk_queue_start_tag(struct request_queue *q, struct request *rq)
{
struct blk_queue_tag *bqt = q->queue_tags;
+ unsigned max_depth, offset;
int tag;
if (unlikely((rq->cmd_flags & REQ_QUEUED))) {
/*
* Protect against shared tag maps, as we may not have exclusive
* access to the tag map.
+ *
+ * We reserve a few tags just for sync IO, since we don't want
+ * to starve sync IO on behalf of flooding async IO.
*/
+ max_depth = bqt->max_depth;
+ if (rq_is_sync(rq))
+ offset = 0;
+ else
+ offset = max_depth >> 2;
+
do {
- tag = find_first_zero_bit(bqt->tag_map, bqt->max_depth);
- if (tag >= bqt->max_depth)
+ tag = find_next_zero_bit(bqt->tag_map, max_depth, offset);
+ if (tag >= max_depth)
return 1;
} while (test_and_set_bit_lock(tag, bqt->tag_map));
--- /dev/null
+/*
+ * Functions related to generic timeout handling of requests.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/fault-inject.h>
+
+#include "blk.h"
+
+#ifdef CONFIG_FAIL_IO_TIMEOUT
+
+static DECLARE_FAULT_ATTR(fail_io_timeout);
+
+static int __init setup_fail_io_timeout(char *str)
+{
+ return setup_fault_attr(&fail_io_timeout, str);
+}
+__setup("fail_io_timeout=", setup_fail_io_timeout);
+
+int blk_should_fake_timeout(struct request_queue *q)
+{
+ if (!test_bit(QUEUE_FLAG_FAIL_IO, &q->queue_flags))
+ return 0;
+
+ return should_fail(&fail_io_timeout, 1);
+}
+
+static int __init fail_io_timeout_debugfs(void)
+{
+ return init_fault_attr_dentries(&fail_io_timeout, "fail_io_timeout");
+}
+
+late_initcall(fail_io_timeout_debugfs);
+
+ssize_t part_timeout_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct gendisk *disk = dev_to_disk(dev);
+ int set = test_bit(QUEUE_FLAG_FAIL_IO, &disk->queue->queue_flags);
+
+ return sprintf(buf, "%d\n", set != 0);
+}
+
+ssize_t part_timeout_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct gendisk *disk = dev_to_disk(dev);
+ int val;
+
+ if (count) {
+ struct request_queue *q = disk->queue;
+ char *p = (char *) buf;
+
+ val = simple_strtoul(p, &p, 10);
+ spin_lock_irq(q->queue_lock);
+ if (val)
+ queue_flag_set(QUEUE_FLAG_FAIL_IO, q);
+ else
+ queue_flag_clear(QUEUE_FLAG_FAIL_IO, q);
+ spin_unlock_irq(q->queue_lock);
+ }
+
+ return count;
+}
+
+#endif /* CONFIG_FAIL_IO_TIMEOUT */
+
+/*
+ * blk_delete_timer - Delete/cancel timer for a given function.
+ * @req: request that we are canceling timer for
+ *
+ */
+void blk_delete_timer(struct request *req)
+{
+ struct request_queue *q = req->q;
+
+ /*
+ * Nothing to detach
+ */
+ if (!q->rq_timed_out_fn || !req->deadline)
+ return;
+
+ list_del_init(&req->timeout_list);
+
+ if (list_empty(&q->timeout_list))
+ del_timer(&q->timeout);
+}
+
+static void blk_rq_timed_out(struct request *req)
+{
+ struct request_queue *q = req->q;
+ enum blk_eh_timer_return ret;
+
+ ret = q->rq_timed_out_fn(req);
+ switch (ret) {
+ case BLK_EH_HANDLED:
+ __blk_complete_request(req);
+ break;
+ case BLK_EH_RESET_TIMER:
+ blk_clear_rq_complete(req);
+ blk_add_timer(req);
+ break;
+ case BLK_EH_NOT_HANDLED:
+ /*
+ * LLD handles this for now but in the future
+ * we can send a request msg to abort the command
+ * and we can move more of the generic scsi eh code to
+ * the blk layer.
+ */
+ break;
+ default:
+ printk(KERN_ERR "block: bad eh return: %d\n", ret);
+ break;
+ }
+}
+
+void blk_rq_timed_out_timer(unsigned long data)
+{
+ struct request_queue *q = (struct request_queue *) data;
+ unsigned long flags, uninitialized_var(next), next_set = 0;
+ struct request *rq, *tmp;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+
+ list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list) {
+ if (time_after_eq(jiffies, rq->deadline)) {
+ list_del_init(&rq->timeout_list);
+
+ /*
+ * Check if we raced with end io completion
+ */
+ if (blk_mark_rq_complete(rq))
+ continue;
+ blk_rq_timed_out(rq);
+ }
+ if (!next_set) {
+ next = rq->deadline;
+ next_set = 1;
+ } else if (time_after(next, rq->deadline))
+ next = rq->deadline;
+ }
+
+ if (next_set && !list_empty(&q->timeout_list))
+ mod_timer(&q->timeout, round_jiffies(next));
+
+ spin_unlock_irqrestore(q->queue_lock, flags);
+}
+
+/**
+ * blk_abort_request -- Request request recovery for the specified command
+ * @req: pointer to the request of interest
+ *
+ * This function requests that the block layer start recovery for the
+ * request by deleting the timer and calling the q's timeout function.
+ * LLDDs who implement their own error recovery MAY ignore the timeout
+ * event if they generated blk_abort_req. Must hold queue lock.
+ */
+void blk_abort_request(struct request *req)
+{
+ if (blk_mark_rq_complete(req))
+ return;
+ blk_delete_timer(req);
+ blk_rq_timed_out(req);
+}
+EXPORT_SYMBOL_GPL(blk_abort_request);
+
+/**
+ * blk_add_timer - Start timeout timer for a single request
+ * @req: request that is about to start running.
+ *
+ * Notes:
+ * Each request has its own timer, and as it is added to the queue, we
+ * set up the timer. When the request completes, we cancel the timer.
+ */
+void blk_add_timer(struct request *req)
+{
+ struct request_queue *q = req->q;
+ unsigned long expiry;
+
+ if (!q->rq_timed_out_fn)
+ return;
+
+ BUG_ON(!list_empty(&req->timeout_list));
+ BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags));
+
+ if (req->timeout)
+ req->deadline = jiffies + req->timeout;
+ else {
+ req->deadline = jiffies + q->rq_timeout;
+ /*
+ * Some LLDs, like scsi, peek at the timeout to prevent
+ * a command from being retried forever.
+ */
+ req->timeout = q->rq_timeout;
+ }
+ list_add_tail(&req->timeout_list, &q->timeout_list);
+
+ /*
+ * If the timer isn't already pending or this timeout is earlier
+ * than an existing one, modify the timer. Round to next nearest
+ * second.
+ */
+ expiry = round_jiffies(req->deadline);
+
+ /*
+ * We use ->deadline == 0 to detect whether a timer was added or
+ * not, so just increase to next jiffy for that specific case
+ */
+ if (unlikely(!req->deadline))
+ req->deadline = 1;
+
+ if (!timer_pending(&q->timeout) ||
+ time_before(expiry, q->timeout.expires))
+ mod_timer(&q->timeout, expiry);
+}
+
+/**
+ * blk_abort_queue -- Abort all request on given queue
+ * @queue: pointer to queue
+ *
+ */
+void blk_abort_queue(struct request_queue *q)
+{
+ unsigned long flags;
+ struct request *rq, *tmp;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+
+ elv_abort_queue(q);
+
+ list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list)
+ blk_abort_request(rq);
+
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+}
+EXPORT_SYMBOL_GPL(blk_abort_queue);
void blk_unplug_work(struct work_struct *work);
void blk_unplug_timeout(unsigned long data);
+void blk_rq_timed_out_timer(unsigned long data);
+void blk_delete_timer(struct request *);
+void blk_add_timer(struct request *);
+
+/*
+ * Internal atomic flags for request handling
+ */
+enum rq_atomic_flags {
+ REQ_ATOM_COMPLETE = 0,
+};
+
+/*
+ * EH timer and IO completion will both attempt to 'grab' the request, make
+ * sure that only one of them suceeds
+ */
+static inline int blk_mark_rq_complete(struct request *rq)
+{
+ return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
+}
+
+static inline void blk_clear_rq_complete(struct request *rq)
+{
+ clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
+}
+
+#ifdef CONFIG_FAIL_IO_TIMEOUT
+int blk_should_fake_timeout(struct request_queue *);
+ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
+ssize_t part_timeout_store(struct device *, struct device_attribute *,
+ const char *, size_t);
+#else
+static inline int blk_should_fake_timeout(struct request_queue *q)
+{
+ return 0;
+}
+#endif
struct io_context *current_io_context(gfp_t gfp_flags, int node);
#endif /* BLK_DEV_INTEGRITY */
+static inline int blk_cpu_to_group(int cpu)
+{
+#ifdef CONFIG_SCHED_MC
+ cpumask_t mask = cpu_coregroup_map(cpu);
+ return first_cpu(mask);
+#elif defined(CONFIG_SCHED_SMT)
+ return first_cpu(per_cpu(cpu_sibling_map, cpu));
+#else
+ return cpu;
+#endif
+}
+
#endif
*/
static u32 ddir_act[2] __read_mostly = { BLK_TC_ACT(BLK_TC_READ), BLK_TC_ACT(BLK_TC_WRITE) };
-/*
- * Bio action bits of interest
- */
-static u32 bio_act[9] __read_mostly = { 0, BLK_TC_ACT(BLK_TC_BARRIER), BLK_TC_ACT(BLK_TC_SYNC), 0, BLK_TC_ACT(BLK_TC_AHEAD), 0, 0, 0, BLK_TC_ACT(BLK_TC_META) };
-
-/*
- * More could be added as needed, taking care to increment the decrementer
- * to get correct indexing
- */
-#define trace_barrier_bit(rw) \
- (((rw) & (1 << BIO_RW_BARRIER)) >> (BIO_RW_BARRIER - 0))
-#define trace_sync_bit(rw) \
- (((rw) & (1 << BIO_RW_SYNC)) >> (BIO_RW_SYNC - 1))
-#define trace_ahead_bit(rw) \
- (((rw) & (1 << BIO_RW_AHEAD)) << (2 - BIO_RW_AHEAD))
-#define trace_meta_bit(rw) \
- (((rw) & (1 << BIO_RW_META)) >> (BIO_RW_META - 3))
+/* The ilog2() calls fall out because they're constant */
+#define MASK_TC_BIT(rw, __name) ( (rw & (1 << BIO_RW_ ## __name)) << \
+ (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name) )
/*
* The worker for the various blk_add_trace*() types. Fills out a
return;
what |= ddir_act[rw & WRITE];
- what |= bio_act[trace_barrier_bit(rw)];
- what |= bio_act[trace_sync_bit(rw)];
- what |= bio_act[trace_ahead_bit(rw)];
- what |= bio_act[trace_meta_bit(rw)];
+ what |= MASK_TC_BIT(rw, BARRIER);
+ what |= MASK_TC_BIT(rw, SYNC);
+ what |= MASK_TC_BIT(rw, AHEAD);
+ what |= MASK_TC_BIT(rw, META);
+ what |= MASK_TC_BIT(rw, DISCARD);
pid = tsk->pid;
if (unlikely(act_log_check(bt, what, sector, pid)))
if (!buts->buf_size || !buts->buf_nr)
return -EINVAL;
- strcpy(buts->name, name);
+ strncpy(buts->name, name, BLKTRACE_BDEV_SIZE);
+ buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0';
/*
* some device names have larger paths - convert the slashes
next_rq->cmd_type = rq->cmd_type;
dxferp = (void*)(unsigned long)hdr->din_xferp;
- ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len);
+ ret = blk_rq_map_user(q, next_rq, NULL, dxferp,
+ hdr->din_xfer_len, GFP_KERNEL);
if (ret)
goto out;
}
dxfer_len = 0;
if (dxfer_len) {
- ret = blk_rq_map_user(q, rq, dxferp, dxfer_len);
+ ret = blk_rq_map_user(q, rq, NULL, dxferp, dxfer_len,
+ GFP_KERNEL);
if (ret)
goto out;
}
#define CFQ_MIN_TT (2)
#define CFQ_SLICE_SCALE (5)
+#define CFQ_HW_QUEUE_MIN (5)
#define RQ_CIC(rq) \
((struct cfq_io_context *) (rq)->elevator_private)
int rq_in_driver;
int sync_flight;
+
+ /*
+ * queue-depth detection
+ */
+ int rq_queued;
int hw_tag;
+ int hw_tag_samples;
+ int rq_in_driver_peak;
/*
* idle window management
{
if (cfqd->busy_queues) {
cfq_log(cfqd, "schedule dispatch");
- kblockd_schedule_work(&cfqd->unplug_work);
+ kblockd_schedule_work(cfqd->queue, &cfqd->unplug_work);
}
}
cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d",
cfqd->rq_in_driver);
- /*
- * If the depth is larger 1, it really could be queueing. But lets
- * make the mark a little higher - idling could still be good for
- * low queueing, and a low queueing number could also just indicate
- * a SCSI mid layer like behaviour where limit+1 is often seen.
- */
- if (!cfqd->hw_tag && cfqd->rq_in_driver > 4)
- cfqd->hw_tag = 1;
-
cfqd->last_position = rq->hard_sector + rq->hard_nr_sectors;
}
list_del_init(&rq->queuelist);
cfq_del_rq_rb(rq);
+ cfqq->cfqd->rq_queued--;
if (rq_is_meta(rq)) {
WARN_ON(!cfqq->meta_pending);
cfqq->meta_pending--;
struct cfq_io_context *cic;
unsigned long sl;
+ /*
+ * SSD device without seek penalty, disable idling. But only do so
+ * for devices that support queuing, otherwise we still have a problem
+ * with sync vs async workloads.
+ */
+ if (blk_queue_nonrot(cfqd->queue) && cfqd->hw_tag)
+ return;
+
WARN_ON(!RB_EMPTY_ROOT(&cfqq->sort_list));
WARN_ON(cfq_cfqq_slice_new(cfqq));
{
struct cfq_io_context *cic = RQ_CIC(rq);
+ cfqd->rq_queued++;
if (rq_is_meta(rq))
cfqq->meta_pending++;
cfq_rq_enqueued(cfqd, cfqq, rq);
}
+/*
+ * Update hw_tag based on peak queue depth over 50 samples under
+ * sufficient load.
+ */
+static void cfq_update_hw_tag(struct cfq_data *cfqd)
+{
+ if (cfqd->rq_in_driver > cfqd->rq_in_driver_peak)
+ cfqd->rq_in_driver_peak = cfqd->rq_in_driver;
+
+ if (cfqd->rq_queued <= CFQ_HW_QUEUE_MIN &&
+ cfqd->rq_in_driver <= CFQ_HW_QUEUE_MIN)
+ return;
+
+ if (cfqd->hw_tag_samples++ < 50)
+ return;
+
+ if (cfqd->rq_in_driver_peak >= CFQ_HW_QUEUE_MIN)
+ cfqd->hw_tag = 1;
+ else
+ cfqd->hw_tag = 0;
+
+ cfqd->hw_tag_samples = 0;
+ cfqd->rq_in_driver_peak = 0;
+}
+
static void cfq_completed_request(struct request_queue *q, struct request *rq)
{
struct cfq_queue *cfqq = RQ_CFQQ(rq);
now = jiffies;
cfq_log_cfqq(cfqd, cfqq, "complete");
+ cfq_update_hw_tag(cfqd);
+
WARN_ON(!cfqd->rq_in_driver);
WARN_ON(!cfqq->dispatched);
cfqd->rq_in_driver--;
cfqd->cfq_slice[1] = cfq_slice_sync;
cfqd->cfq_slice_async_rq = cfq_slice_async_rq;
cfqd->cfq_slice_idle = cfq_slice_idle;
+ cfqd->hw_tag = 1;
return cfqd;
}
{
int ret;
struct blk_cmd_filter *filter = &disk->queue->cmd_filter;
- struct kobject *parent = kobject_get(disk->holder_dir->parent);
- if (!parent)
- return -ENODEV;
-
- ret = kobject_init_and_add(&filter->kobj, &rcf_ktype, parent,
+ ret = kobject_init_and_add(&filter->kobj, &rcf_ktype,
+ &disk_to_dev(disk)->kobj,
"%s", "cmd_filter");
-
if (ret < 0)
return ret;
struct blk_cmd_filter *filter = &disk->queue->cmd_filter;
kobject_put(&filter->kobj);
- kobject_put(disk->holder_dir->parent);
}
EXPORT_SYMBOL(blk_unregister_filter);
#endif
return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
case BLKFLSBUF:
case BLKROSET:
+ case BLKDISCARD:
/*
* the ones below are implemented in blkdev_locked_ioctl,
* but we call blkdev_ioctl, which gets the lock for us
*/
struct rb_root sort_list[2];
struct list_head fifo_list[2];
-
+
/*
* next in sort order. read, write or both are NULL
*/
static void deadline_move_request(struct deadline_data *, struct request *);
-#define RQ_RB_ROOT(dd, rq) (&(dd)->sort_list[rq_data_dir((rq))])
+static inline struct rb_root *
+deadline_rb_root(struct deadline_data *dd, struct request *rq)
+{
+ return &dd->sort_list[rq_data_dir(rq)];
+}
/*
* get the request after `rq' in sector-sorted order
static void
deadline_add_rq_rb(struct deadline_data *dd, struct request *rq)
{
- struct rb_root *root = RQ_RB_ROOT(dd, rq);
+ struct rb_root *root = deadline_rb_root(dd, rq);
struct request *__alias;
-retry:
- __alias = elv_rb_add(root, rq);
- if (unlikely(__alias)) {
+ while (unlikely(__alias = elv_rb_add(root, rq)))
deadline_move_request(dd, __alias);
- goto retry;
- }
}
static inline void
if (dd->next_rq[data_dir] == rq)
dd->next_rq[data_dir] = deadline_latter_request(rq);
- elv_rb_del(RQ_RB_ROOT(dd, rq), rq);
+ elv_rb_del(deadline_rb_root(dd, rq), rq);
}
/*
deadline_add_rq_rb(dd, rq);
/*
- * set expire time (only used for reads) and add to fifo list
+ * set expire time and add to fifo list
*/
rq_set_fifo_time(rq, jiffies + dd->fifo_expire[data_dir]);
list_add_tail(&rq->queuelist, &dd->fifo_list[data_dir]);
* if the merge was a front merge, we need to reposition request
*/
if (type == ELEVATOR_FRONT_MERGE) {
- elv_rb_del(RQ_RB_ROOT(dd, req), req);
+ elv_rb_del(deadline_rb_root(dd, req), req);
deadline_add_rq_rb(dd, req);
}
}
dd->next_rq[WRITE] = NULL;
dd->next_rq[data_dir] = deadline_latter_request(rq);
- dd->last_sector = rq->sector + rq->nr_sectors;
+ dd->last_sector = rq_end_sector(rq);
/*
* take it off the sort and fifo list, move
}
/*
- * deadline_check_fifo returns 0 if there are no expired reads on the fifo,
+ * deadline_check_fifo returns 0 if there are no expired requests on the fifo,
* 1 otherwise. Requires !list_empty(&dd->fifo_list[data_dir])
*/
static inline int deadline_check_fifo(struct deadline_data *dd, int ddir)
else
rq = dd->next_rq[READ];
- if (rq) {
- /* we have a "next request" */
-
- if (dd->last_sector != rq->sector)
- /* end the batch on a non sequential request */
- dd->batching += dd->fifo_batch;
-
- if (dd->batching < dd->fifo_batch)
- /* we are still entitled to batch */
- goto dispatch_request;
- }
+ if (rq && dd->batching < dd->fifo_batch)
+ /* we have a next request are still entitled to batch */
+ goto dispatch_request;
/*
* at this point we are not running a batch. select the appropriate
#include <linux/delay.h>
#include <linux/blktrace_api.h>
#include <linux/hash.h>
+#include <linux/uaccess.h>
-#include <asm/uaccess.h>
+#include "blk.h"
static DEFINE_SPINLOCK(elv_list_lock);
static LIST_HEAD(elv_list);
if (!rq_mergeable(rq))
return 0;
+ /*
+ * Don't merge file system requests and discard requests
+ */
+ if (bio_discard(bio) != bio_discard(rq->bio))
+ return 0;
+
/*
* different data direction or already started, don't merge
*/
list_for_each_prev(entry, &q->queue_head) {
struct request *pos = list_entry_rq(entry);
+ if (blk_discard_rq(rq) != blk_discard_rq(pos))
+ break;
if (rq_data_dir(rq) != rq_data_dir(pos))
break;
if (pos->cmd_flags & stop_flags)
break;
case ELEVATOR_INSERT_SORT:
- BUG_ON(!blk_fs_request(rq));
+ BUG_ON(!blk_fs_request(rq) && !blk_discard_rq(rq));
rq->cmd_flags |= REQ_SORTED;
q->nr_sorted++;
if (rq_mergeable(rq)) {
* this request is scheduling boundary, update
* end_sector
*/
- if (blk_fs_request(rq)) {
+ if (blk_fs_request(rq) || blk_discard_rq(rq)) {
q->end_sector = rq_end_sector(rq);
q->boundary_rq = rq;
}
* not ever see it.
*/
if (blk_empty_barrier(rq)) {
- end_queued_request(rq, 1);
+ __blk_end_request(rq, 0, blk_rq_bytes(rq));
continue;
}
if (!(rq->cmd_flags & REQ_STARTED)) {
*/
rq->cmd_flags |= REQ_STARTED;
blk_add_trace_rq(q, rq, BLK_TA_ISSUE);
+
+ /*
+ * We are now handing the request to the hardware,
+ * add the timeout handler
+ */
+ blk_add_timer(rq);
}
if (!q->boundary_rq || q->boundary_rq == rq) {
* device can handle
*/
rq->nr_phys_segments++;
- rq->nr_hw_segments++;
}
if (!q->prep_rq_fn)
* so that we don't add it again
*/
--rq->nr_phys_segments;
- --rq->nr_hw_segments;
}
rq = NULL;
break;
} else if (ret == BLKPREP_KILL) {
rq->cmd_flags |= REQ_QUIET;
- end_queued_request(rq, 0);
+ __blk_end_request(rq, -EIO, blk_rq_bytes(rq));
} else {
printk(KERN_ERR "%s: bad return=%d\n", __func__, ret);
break;
return ELV_MQUEUE_MAY;
}
+void elv_abort_queue(struct request_queue *q)
+{
+ struct request *rq;
+
+ while (!list_empty(&q->queue_head)) {
+ rq = list_entry_rq(q->queue_head.next);
+ rq->cmd_flags |= REQ_QUIET;
+ blk_add_trace_rq(q, rq, BLK_TA_ABORT);
+ __blk_end_request(rq, -EIO, blk_rq_bytes(rq));
+ }
+}
+EXPORT_SYMBOL(elv_abort_queue);
+
void elv_completed_request(struct request_queue *q, struct request *rq)
{
elevator_t *e = q->elevator;
#include <linux/kobj_map.h>
#include <linux/buffer_head.h>
#include <linux/mutex.h>
+#include <linux/idr.h>
#include "blk.h"
struct kobject *block_depr;
#endif
+/* for extended dynamic devt allocation, currently only one major is used */
+#define MAX_EXT_DEVT (1 << MINORBITS)
+
+/* For extended devt allocation. ext_devt_mutex prevents look up
+ * results from going away underneath its user.
+ */
+static DEFINE_MUTEX(ext_devt_mutex);
+static DEFINE_IDR(ext_devt_idr);
+
static struct device_type disk_type;
+/**
+ * disk_get_part - get partition
+ * @disk: disk to look partition from
+ * @partno: partition number
+ *
+ * Look for partition @partno from @disk. If found, increment
+ * reference count and return it.
+ *
+ * CONTEXT:
+ * Don't care.
+ *
+ * RETURNS:
+ * Pointer to the found partition on success, NULL if not found.
+ */
+struct hd_struct *disk_get_part(struct gendisk *disk, int partno)
+{
+ struct hd_struct *part = NULL;
+ struct disk_part_tbl *ptbl;
+
+ if (unlikely(partno < 0))
+ return NULL;
+
+ rcu_read_lock();
+
+ ptbl = rcu_dereference(disk->part_tbl);
+ if (likely(partno < ptbl->len)) {
+ part = rcu_dereference(ptbl->part[partno]);
+ if (part)
+ get_device(part_to_dev(part));
+ }
+
+ rcu_read_unlock();
+
+ return part;
+}
+EXPORT_SYMBOL_GPL(disk_get_part);
+
+/**
+ * disk_part_iter_init - initialize partition iterator
+ * @piter: iterator to initialize
+ * @disk: disk to iterate over
+ * @flags: DISK_PITER_* flags
+ *
+ * Initialize @piter so that it iterates over partitions of @disk.
+ *
+ * CONTEXT:
+ * Don't care.
+ */
+void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk,
+ unsigned int flags)
+{
+ struct disk_part_tbl *ptbl;
+
+ rcu_read_lock();
+ ptbl = rcu_dereference(disk->part_tbl);
+
+ piter->disk = disk;
+ piter->part = NULL;
+
+ if (flags & DISK_PITER_REVERSE)
+ piter->idx = ptbl->len - 1;
+ else if (flags & DISK_PITER_INCL_PART0)
+ piter->idx = 0;
+ else
+ piter->idx = 1;
+
+ piter->flags = flags;
+
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(disk_part_iter_init);
+
+/**
+ * disk_part_iter_next - proceed iterator to the next partition and return it
+ * @piter: iterator of interest
+ *
+ * Proceed @piter to the next partition and return it.
+ *
+ * CONTEXT:
+ * Don't care.
+ */
+struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter)
+{
+ struct disk_part_tbl *ptbl;
+ int inc, end;
+
+ /* put the last partition */
+ disk_put_part(piter->part);
+ piter->part = NULL;
+
+ /* get part_tbl */
+ rcu_read_lock();
+ ptbl = rcu_dereference(piter->disk->part_tbl);
+
+ /* determine iteration parameters */
+ if (piter->flags & DISK_PITER_REVERSE) {
+ inc = -1;
+ if (piter->flags & DISK_PITER_INCL_PART0)
+ end = -1;
+ else
+ end = 0;
+ } else {
+ inc = 1;
+ end = ptbl->len;
+ }
+
+ /* iterate to the next partition */
+ for (; piter->idx != end; piter->idx += inc) {
+ struct hd_struct *part;
+
+ part = rcu_dereference(ptbl->part[piter->idx]);
+ if (!part)
+ continue;
+ if (!(piter->flags & DISK_PITER_INCL_EMPTY) && !part->nr_sects)
+ continue;
+
+ get_device(part_to_dev(part));
+ piter->part = part;
+ piter->idx += inc;
+ break;
+ }
+
+ rcu_read_unlock();
+
+ return piter->part;
+}
+EXPORT_SYMBOL_GPL(disk_part_iter_next);
+
+/**
+ * disk_part_iter_exit - finish up partition iteration
+ * @piter: iter of interest
+ *
+ * Called when iteration is over. Cleans up @piter.
+ *
+ * CONTEXT:
+ * Don't care.
+ */
+void disk_part_iter_exit(struct disk_part_iter *piter)
+{
+ disk_put_part(piter->part);
+ piter->part = NULL;
+}
+EXPORT_SYMBOL_GPL(disk_part_iter_exit);
+
+/**
+ * disk_map_sector_rcu - map sector to partition
+ * @disk: gendisk of interest
+ * @sector: sector to map
+ *
+ * Find out which partition @sector maps to on @disk. This is
+ * primarily used for stats accounting.
+ *
+ * CONTEXT:
+ * RCU read locked. The returned partition pointer is valid only
+ * while preemption is disabled.
+ *
+ * RETURNS:
+ * Found partition on success, part0 is returned if no partition matches
+ */
+struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector)
+{
+ struct disk_part_tbl *ptbl;
+ int i;
+
+ ptbl = rcu_dereference(disk->part_tbl);
+
+ for (i = 1; i < ptbl->len; i++) {
+ struct hd_struct *part = rcu_dereference(ptbl->part[i]);
+
+ if (part && part->start_sect <= sector &&
+ sector < part->start_sect + part->nr_sects)
+ return part;
+ }
+ return &disk->part0;
+}
+EXPORT_SYMBOL_GPL(disk_map_sector_rcu);
+
/*
* Can be deleted altogether. Later.
*
}
#ifdef CONFIG_PROC_FS
-void blkdev_show(struct seq_file *f, off_t offset)
+void blkdev_show(struct seq_file *seqf, off_t offset)
{
struct blk_major_name *dp;
if (offset < BLKDEV_MAJOR_HASH_SIZE) {
mutex_lock(&block_class_lock);
for (dp = major_names[offset]; dp; dp = dp->next)
- seq_printf(f, "%3d %s\n", dp->major, dp->name);
+ seq_printf(seqf, "%3d %s\n", dp->major, dp->name);
mutex_unlock(&block_class_lock);
}
}
static struct kobj_map *bdev_map;
+/**
+ * blk_mangle_minor - scatter minor numbers apart
+ * @minor: minor number to mangle
+ *
+ * Scatter consecutively allocated @minor number apart if MANGLE_DEVT
+ * is enabled. Mangling twice gives the original value.
+ *
+ * RETURNS:
+ * Mangled value.
+ *
+ * CONTEXT:
+ * Don't care.
+ */
+static int blk_mangle_minor(int minor)
+{
+#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
+ int i;
+
+ for (i = 0; i < MINORBITS / 2; i++) {
+ int low = minor & (1 << i);
+ int high = minor & (1 << (MINORBITS - 1 - i));
+ int distance = MINORBITS - 1 - 2 * i;
+
+ minor ^= low | high; /* clear both bits */
+ low <<= distance; /* swap the positions */
+ high >>= distance;
+ minor |= low | high; /* and set */
+ }
+#endif
+ return minor;
+}
+
+/**
+ * blk_alloc_devt - allocate a dev_t for a partition
+ * @part: partition to allocate dev_t for
+ * @gfp_mask: memory allocation flag
+ * @devt: out parameter for resulting dev_t
+ *
+ * Allocate a dev_t for block device.
+ *
+ * RETURNS:
+ * 0 on success, allocated dev_t is returned in *@devt. -errno on
+ * failure.
+ *
+ * CONTEXT:
+ * Might sleep.
+ */
+int blk_alloc_devt(struct hd_struct *part, dev_t *devt)
+{
+ struct gendisk *disk = part_to_disk(part);
+ int idx, rc;
+
+ /* in consecutive minor range? */
+ if (part->partno < disk->minors) {
+ *devt = MKDEV(disk->major, disk->first_minor + part->partno);
+ return 0;
+ }
+
+ /* allocate ext devt */
+ do {
+ if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL))
+ return -ENOMEM;
+ rc = idr_get_new(&ext_devt_idr, part, &idx);
+ } while (rc == -EAGAIN);
+
+ if (rc)
+ return rc;
+
+ if (idx > MAX_EXT_DEVT) {
+ idr_remove(&ext_devt_idr, idx);
+ return -EBUSY;
+ }
+
+ *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx));
+ return 0;
+}
+
+/**
+ * blk_free_devt - free a dev_t
+ * @devt: dev_t to free
+ *
+ * Free @devt which was allocated using blk_alloc_devt().
+ *
+ * CONTEXT:
+ * Might sleep.
+ */
+void blk_free_devt(dev_t devt)
+{
+ might_sleep();
+
+ if (devt == MKDEV(0, 0))
+ return;
+
+ if (MAJOR(devt) == BLOCK_EXT_MAJOR) {
+ mutex_lock(&ext_devt_mutex);
+ idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt)));
+ mutex_unlock(&ext_devt_mutex);
+ }
+}
+
+static char *bdevt_str(dev_t devt, char *buf)
+{
+ if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) {
+ char tbuf[BDEVT_SIZE];
+ snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt));
+ snprintf(buf, BDEVT_SIZE, "%-9s", tbuf);
+ } else
+ snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt));
+
+ return buf;
+}
+
/*
* Register device numbers dev..(dev+range-1)
* range must be nonzero
EXPORT_SYMBOL(blk_unregister_region);
-static struct kobject *exact_match(dev_t devt, int *part, void *data)
+static struct kobject *exact_match(dev_t devt, int *partno, void *data)
{
struct gendisk *p = data;
- return &p->dev.kobj;
+ return &disk_to_dev(p)->kobj;
}
static int exact_lock(dev_t devt, void *data)
*
* This function registers the partitioning information in @disk
* with the kernel.
+ *
+ * FIXME: error handling
*/
void add_disk(struct gendisk *disk)
{
struct backing_dev_info *bdi;
+ dev_t devt;
int retval;
+ /* minors == 0 indicates to use ext devt from part0 and should
+ * be accompanied with EXT_DEVT flag. Make sure all
+ * parameters make sense.
+ */
+ WARN_ON(disk->minors && !(disk->major || disk->first_minor));
+ WARN_ON(!disk->minors && !(disk->flags & GENHD_FL_EXT_DEVT));
+
disk->flags |= GENHD_FL_UP;
- blk_register_region(MKDEV(disk->major, disk->first_minor),
- disk->minors, NULL, exact_match, exact_lock, disk);
+
+ retval = blk_alloc_devt(&disk->part0, &devt);
+ if (retval) {
+ WARN_ON(1);
+ return;
+ }
+ disk_to_dev(disk)->devt = devt;
+
+ /* ->major and ->first_minor aren't supposed to be
+ * dereferenced from here on, but set them just in case.
+ */
+ disk->major = MAJOR(devt);
+ disk->first_minor = MINOR(devt);
+
+ blk_register_region(disk_devt(disk), disk->minors, NULL,
+ exact_match, exact_lock, disk);
register_disk(disk);
blk_register_queue(disk);
bdi = &disk->queue->backing_dev_info;
- bdi_register_dev(bdi, MKDEV(disk->major, disk->first_minor));
- retval = sysfs_create_link(&disk->dev.kobj, &bdi->dev->kobj, "bdi");
+ bdi_register_dev(bdi, disk_devt(disk));
+ retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj,
+ "bdi");
WARN_ON(retval);
}
void unlink_gendisk(struct gendisk *disk)
{
- sysfs_remove_link(&disk->dev.kobj, "bdi");
+ sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
bdi_unregister(&disk->queue->backing_dev_info);
blk_unregister_queue(disk);
- blk_unregister_region(MKDEV(disk->major, disk->first_minor),
- disk->minors);
+ blk_unregister_region(disk_devt(disk), disk->minors);
}
/**
* get_gendisk - get partitioning information for a given device
- * @dev: device to get partitioning information for
+ * @devt: device to get partitioning information for
+ * @part: returned partition index
*
* This function gets the structure containing partitioning
- * information for the given device @dev.
+ * information for the given device @devt.
*/
-struct gendisk *get_gendisk(dev_t devt, int *part)
+struct gendisk *get_gendisk(dev_t devt, int *partno)
{
- struct kobject *kobj = kobj_lookup(bdev_map, devt, part);
- struct device *dev = kobj_to_dev(kobj);
+ struct gendisk *disk = NULL;
+
+ if (MAJOR(devt) != BLOCK_EXT_MAJOR) {
+ struct kobject *kobj;
+
+ kobj = kobj_lookup(bdev_map, devt, partno);
+ if (kobj)
+ disk = dev_to_disk(kobj_to_dev(kobj));
+ } else {
+ struct hd_struct *part;
- return kobj ? dev_to_disk(dev) : NULL;
+ mutex_lock(&ext_devt_mutex);
+ part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt)));
+ if (part && get_disk(part_to_disk(part))) {
+ *partno = part->partno;
+ disk = part_to_disk(part);
+ }
+ mutex_unlock(&ext_devt_mutex);
+ }
+
+ return disk;
}
-/*
- * print a partitions - intended for places where the root filesystem can't be
- * mounted and thus to give the victim some idea of what went wrong
+/**
+ * bdget_disk - do bdget() by gendisk and partition number
+ * @disk: gendisk of interest
+ * @partno: partition number
+ *
+ * Find partition @partno from @disk, do bdget() on it.
+ *
+ * CONTEXT:
+ * Don't care.
+ *
+ * RETURNS:
+ * Resulting block_device on success, NULL on failure.
*/
-static int printk_partition(struct device *dev, void *data)
+struct block_device *bdget_disk(struct gendisk *disk, int partno)
{
- struct gendisk *sgp;
- char buf[BDEVNAME_SIZE];
- int n;
-
- if (dev->type != &disk_type)
- goto exit;
+ struct hd_struct *part;
+ struct block_device *bdev = NULL;
- sgp = dev_to_disk(dev);
- /*
- * Don't show empty devices or things that have been surpressed
- */
- if (get_capacity(sgp) == 0 ||
- (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
- goto exit;
+ part = disk_get_part(disk, partno);
+ if (part)
+ bdev = bdget(part_devt(part));
+ disk_put_part(part);
- /*
- * Note, unlike /proc/partitions, I am showing the numbers in
- * hex - the same format as the root= option takes.
- */
- printk("%02x%02x %10llu %s",
- sgp->major, sgp->first_minor,
- (unsigned long long)get_capacity(sgp) >> 1,
- disk_name(sgp, 0, buf));
- if (sgp->driverfs_dev != NULL &&
- sgp->driverfs_dev->driver != NULL)
- printk(" driver: %s\n",
- sgp->driverfs_dev->driver->name);
- else
- printk(" (driver?)\n");
-
- /* now show the partitions */
- for (n = 0; n < sgp->minors - 1; ++n) {
- if (sgp->part[n] == NULL)
- goto exit;
- if (sgp->part[n]->nr_sects == 0)
- goto exit;
- printk(" %02x%02x %10llu %s\n",
- sgp->major, n + 1 + sgp->first_minor,
- (unsigned long long)sgp->part[n]->nr_sects >> 1,
- disk_name(sgp, n + 1, buf));
- }
-exit:
- return 0;
+ return bdev;
}
+EXPORT_SYMBOL(bdget_disk);
/*
* print a full list of all partitions - intended for places where the root
*/
void __init printk_all_partitions(void)
{
- mutex_lock(&block_class_lock);
- class_for_each_device(&block_class, NULL, NULL, printk_partition);
- mutex_unlock(&block_class_lock);
+ struct class_dev_iter iter;
+ struct device *dev;
+
+ class_dev_iter_init(&iter, &block_class, NULL, &disk_type);
+ while ((dev = class_dev_iter_next(&iter))) {
+ struct gendisk *disk = dev_to_disk(dev);
+ struct disk_part_iter piter;
+ struct hd_struct *part;
+ char name_buf[BDEVNAME_SIZE];
+ char devt_buf[BDEVT_SIZE];
+
+ /*
+ * Don't show empty devices or things that have been
+ * surpressed
+ */
+ if (get_capacity(disk) == 0 ||
+ (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
+ continue;
+
+ /*
+ * Note, unlike /proc/partitions, I am showing the
+ * numbers in hex - the same format as the root=
+ * option takes.
+ */
+ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
+ while ((part = disk_part_iter_next(&piter))) {
+ bool is_part0 = part == &disk->part0;
+
+ printk("%s%s %10llu %s", is_part0 ? "" : " ",
+ bdevt_str(part_devt(part), devt_buf),
+ (unsigned long long)part->nr_sects >> 1,
+ disk_name(disk, part->partno, name_buf));
+ if (is_part0) {
+ if (disk->driverfs_dev != NULL &&
+ disk->driverfs_dev->driver != NULL)
+ printk(" driver: %s\n",
+ disk->driverfs_dev->driver->name);
+ else
+ printk(" (driver?)\n");
+ } else
+ printk("\n");
+ }
+ disk_part_iter_exit(&piter);
+ }
+ class_dev_iter_exit(&iter);
}
#ifdef CONFIG_PROC_FS
/* iterator */
-static int find_start(struct device *dev, void *data)
+static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos)
{
- loff_t *k = data;
+ loff_t skip = *pos;
+ struct class_dev_iter *iter;
+ struct device *dev;
- if (dev->type != &disk_type)
- return 0;
- if (!*k)
- return 1;
- (*k)--;
- return 0;
+ iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+ if (!iter)
+ return ERR_PTR(-ENOMEM);
+
+ seqf->private = iter;
+ class_dev_iter_init(iter, &block_class, NULL, &disk_type);
+ do {
+ dev = class_dev_iter_next(iter);
+ if (!dev)
+ return NULL;
+ } while (skip--);
+
+ return dev_to_disk(dev);
}
-static void *part_start(struct seq_file *part, loff_t *pos)
+static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos)
{
struct device *dev;
- loff_t k = *pos;
-
- if (!k)
- part->private = (void *)1LU; /* tell show to print header */
- mutex_lock(&block_class_lock);
- dev = class_find_device(&block_class, NULL, &k, find_start);
- if (dev) {
- put_device(dev);
+ (*pos)++;
+ dev = class_dev_iter_next(seqf->private);
+ if (dev)
return dev_to_disk(dev);
- }
+
return NULL;
}
-static int find_next(struct device *dev, void *data)
+static void disk_seqf_stop(struct seq_file *seqf, void *v)
{
- if (dev->type == &disk_type)
- return 1;
- return 0;
-}
+ struct class_dev_iter *iter = seqf->private;
-static void *part_next(struct seq_file *part, void *v, loff_t *pos)
-{
- struct gendisk *gp = v;
- struct device *dev;
- ++*pos;
- dev = class_find_device(&block_class, &gp->dev, NULL, find_next);
- if (dev) {
- put_device(dev);
- return dev_to_disk(dev);
+ /* stop is called even after start failed :-( */
+ if (iter) {
+ class_dev_iter_exit(iter);
+ kfree(iter);
}
- return NULL;
}
-static void part_stop(struct seq_file *part, void *v)
+static void *show_partition_start(struct seq_file *seqf, loff_t *pos)
{
- mutex_unlock(&block_class_lock);
+ static void *p;
+
+ p = disk_seqf_start(seqf, pos);
+ if (!IS_ERR(p) && p && !*pos)
+ seq_puts(seqf, "major minor #blocks name\n\n");
+ return p;
}
-static int show_partition(struct seq_file *part, void *v)
+static int show_partition(struct seq_file *seqf, void *v)
{
struct gendisk *sgp = v;
- int n;
+ struct disk_part_iter piter;
+ struct hd_struct *part;
char buf[BDEVNAME_SIZE];
- /*
- * Print header if start told us to do. This is to preserve
- * the original behavior of not printing header if no
- * partition exists. This hackery will be removed later with
- * class iteration clean up.
- */
- if (part->private) {
- seq_puts(part, "major minor #blocks name\n\n");
- part->private = NULL;
- }
-
/* Don't show non-partitionable removeable devices or empty devices */
- if (!get_capacity(sgp) ||
- (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE)))
+ if (!get_capacity(sgp) || (!disk_partitionable(sgp) &&
+ (sgp->flags & GENHD_FL_REMOVABLE)))
return 0;
if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)
return 0;
/* show the full disk and all non-0 size partitions of it */
- seq_printf(part, "%4d %4d %10llu %s\n",
- sgp->major, sgp->first_minor,
- (unsigned long long)get_capacity(sgp) >> 1,
- disk_name(sgp, 0, buf));
- for (n = 0; n < sgp->minors - 1; n++) {
- if (!sgp->part[n])
- continue;
- if (sgp->part[n]->nr_sects == 0)
- continue;
- seq_printf(part, "%4d %4d %10llu %s\n",
- sgp->major, n + 1 + sgp->first_minor,
- (unsigned long long)sgp->part[n]->nr_sects >> 1 ,
- disk_name(sgp, n + 1, buf));
- }
+ disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0);
+ while ((part = disk_part_iter_next(&piter)))
+ seq_printf(seqf, "%4d %7d %10llu %s\n",
+ MAJOR(part_devt(part)), MINOR(part_devt(part)),
+ (unsigned long long)part->nr_sects >> 1,
+ disk_name(sgp, part->partno, buf));
+ disk_part_iter_exit(&piter);
return 0;
}
const struct seq_operations partitions_op = {
- .start = part_start,
- .next = part_next,
- .stop = part_stop,
+ .start = show_partition_start,
+ .next = disk_seqf_next,
+ .stop = disk_seqf_stop,
.show = show_partition
};
#endif
-static struct kobject *base_probe(dev_t devt, int *part, void *data)
+static struct kobject *base_probe(dev_t devt, int *partno, void *data)
{
if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0)
/* Make old-style 2.4 aliases work */
return sprintf(buf, "%d\n", disk->minors);
}
-static ssize_t disk_removable_show(struct device *dev,
+static ssize_t disk_ext_range_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
- return sprintf(buf, "%d\n",
- (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0));
+ return sprintf(buf, "%d\n", disk_max_parts(disk));
}
-static ssize_t disk_ro_show(struct device *dev,
+static ssize_t disk_removable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
- return sprintf(buf, "%d\n", disk->policy ? 1 : 0);
+ return sprintf(buf, "%d\n",
+ (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0));
}
-static ssize_t disk_size_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+static ssize_t disk_ro_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
- return sprintf(buf, "%llu\n", (unsigned long long)get_capacity(disk));
+ return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0);
}
static ssize_t disk_capability_show(struct device *dev,
return sprintf(buf, "%x\n", disk->flags);
}
-static ssize_t disk_stat_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct gendisk *disk = dev_to_disk(dev);
-
- preempt_disable();
- disk_round_stats(disk);
- preempt_enable();
- return sprintf(buf,
- "%8lu %8lu %8llu %8u "
- "%8lu %8lu %8llu %8u "
- "%8u %8u %8u"
- "\n",
- disk_stat_read(disk, ios[READ]),
- disk_stat_read(disk, merges[READ]),
- (unsigned long long)disk_stat_read(disk, sectors[READ]),
- jiffies_to_msecs(disk_stat_read(disk, ticks[READ])),
- disk_stat_read(disk, ios[WRITE]),
- disk_stat_read(disk, merges[WRITE]),
- (unsigned long long)disk_stat_read(disk, sectors[WRITE]),
- jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])),
- disk->in_flight,
- jiffies_to_msecs(disk_stat_read(disk, io_ticks)),
- jiffies_to_msecs(disk_stat_read(disk, time_in_queue)));
-}
-
-#ifdef CONFIG_FAIL_MAKE_REQUEST
-static ssize_t disk_fail_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct gendisk *disk = dev_to_disk(dev);
-
- return sprintf(buf, "%d\n", disk->flags & GENHD_FL_FAIL ? 1 : 0);
-}
-
-static ssize_t disk_fail_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct gendisk *disk = dev_to_disk(dev);
- int i;
-
- if (count > 0 && sscanf(buf, "%d", &i) > 0) {
- if (i == 0)
- disk->flags &= ~GENHD_FL_FAIL;
- else
- disk->flags |= GENHD_FL_FAIL;
- }
-
- return count;
-}
-
-#endif
-
static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL);
+static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL);
static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL);
static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL);
-static DEVICE_ATTR(size, S_IRUGO, disk_size_show, NULL);
+static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL);
-static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL);
+static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
#ifdef CONFIG_FAIL_MAKE_REQUEST
static struct device_attribute dev_attr_fail =
- __ATTR(make-it-fail, S_IRUGO|S_IWUSR, disk_fail_show, disk_fail_store);
+ __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
+#endif
+#ifdef CONFIG_FAIL_IO_TIMEOUT
+static struct device_attribute dev_attr_fail_timeout =
+ __ATTR(io-timeout-fail, S_IRUGO|S_IWUSR, part_timeout_show,
+ part_timeout_store);
#endif
static struct attribute *disk_attrs[] = {
&dev_attr_range.attr,
+ &dev_attr_ext_range.attr,
&dev_attr_removable.attr,
&dev_attr_ro.attr,
&dev_attr_size.attr,
&dev_attr_stat.attr,
#ifdef CONFIG_FAIL_MAKE_REQUEST
&dev_attr_fail.attr,
+#endif
+#ifdef CONFIG_FAIL_IO_TIMEOUT
+ &dev_attr_fail_timeout.attr,
#endif
NULL
};
NULL
};
+static void disk_free_ptbl_rcu_cb(struct rcu_head *head)
+{
+ struct disk_part_tbl *ptbl =
+ container_of(head, struct disk_part_tbl, rcu_head);
+
+ kfree(ptbl);
+}
+
+/**
+ * disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way
+ * @disk: disk to replace part_tbl for
+ * @new_ptbl: new part_tbl to install
+ *
+ * Replace disk->part_tbl with @new_ptbl in RCU-safe way. The
+ * original ptbl is freed using RCU callback.
+ *
+ * LOCKING:
+ * Matching bd_mutx locked.
+ */
+static void disk_replace_part_tbl(struct gendisk *disk,
+ struct disk_part_tbl *new_ptbl)
+{
+ struct disk_part_tbl *old_ptbl = disk->part_tbl;
+
+ rcu_assign_pointer(disk->part_tbl, new_ptbl);
+ if (old_ptbl)
+ call_rcu(&old_ptbl->rcu_head, disk_free_ptbl_rcu_cb);
+}
+
+/**
+ * disk_expand_part_tbl - expand disk->part_tbl
+ * @disk: disk to expand part_tbl for
+ * @partno: expand such that this partno can fit in
+ *
+ * Expand disk->part_tbl such that @partno can fit in. disk->part_tbl
+ * uses RCU to allow unlocked dereferencing for stats and other stuff.
+ *
+ * LOCKING:
+ * Matching bd_mutex locked, might sleep.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+int disk_expand_part_tbl(struct gendisk *disk, int partno)
+{
+ struct disk_part_tbl *old_ptbl = disk->part_tbl;
+ struct disk_part_tbl *new_ptbl;
+ int len = old_ptbl ? old_ptbl->len : 0;
+ int target = partno + 1;
+ size_t size;
+ int i;
+
+ /* disk_max_parts() is zero during initialization, ignore if so */
+ if (disk_max_parts(disk) && target > disk_max_parts(disk))
+ return -EINVAL;
+
+ if (target <= len)
+ return 0;
+
+ size = sizeof(*new_ptbl) + target * sizeof(new_ptbl->part[0]);
+ new_ptbl = kzalloc_node(size, GFP_KERNEL, disk->node_id);
+ if (!new_ptbl)
+ return -ENOMEM;
+
+ INIT_RCU_HEAD(&new_ptbl->rcu_head);
+ new_ptbl->len = target;
+
+ for (i = 0; i < len; i++)
+ rcu_assign_pointer(new_ptbl->part[i], old_ptbl->part[i]);
+
+ disk_replace_part_tbl(disk, new_ptbl);
+ return 0;
+}
+
static void disk_release(struct device *dev)
{
struct gendisk *disk = dev_to_disk(dev);
kfree(disk->random);
- kfree(disk->part);
- free_disk_stats(disk);
+ disk_replace_part_tbl(disk, NULL);
+ free_part_stats(&disk->part0);
kfree(disk);
}
struct class block_class = {
* The output looks suspiciously like /proc/partitions with a bunch of
* extra fields.
*/
-
-static void *diskstats_start(struct seq_file *part, loff_t *pos)
-{
- struct device *dev;
- loff_t k = *pos;
-
- mutex_lock(&block_class_lock);
- dev = class_find_device(&block_class, NULL, &k, find_start);
- if (dev) {
- put_device(dev);
- return dev_to_disk(dev);
- }
- return NULL;
-}
-
-static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos)
-{
- struct gendisk *gp = v;
- struct device *dev;
-
- ++*pos;
- dev = class_find_device(&block_class, &gp->dev, NULL, find_next);
- if (dev) {
- put_device(dev);
- return dev_to_disk(dev);
- }
- return NULL;
-}
-
-static void diskstats_stop(struct seq_file *part, void *v)
-{
- mutex_unlock(&block_class_lock);
-}
-
-static int diskstats_show(struct seq_file *s, void *v)
+static int diskstats_show(struct seq_file *seqf, void *v)
{
struct gendisk *gp = v;
+ struct disk_part_iter piter;
+ struct hd_struct *hd;
char buf[BDEVNAME_SIZE];
- int n = 0;
+ int cpu;
/*
- if (&gp->dev.kobj.entry == block_class.devices.next)
- seq_puts(s, "major minor name"
+ if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next)
+ seq_puts(seqf, "major minor name"
" rio rmerge rsect ruse wio wmerge "
"wsect wuse running use aveq"
"\n\n");
*/
- preempt_disable();
- disk_round_stats(gp);
- preempt_enable();
- seq_printf(s, "%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n",
- gp->major, n + gp->first_minor, disk_name(gp, n, buf),
- disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]),
- (unsigned long long)disk_stat_read(gp, sectors[0]),
- jiffies_to_msecs(disk_stat_read(gp, ticks[0])),
- disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]),
- (unsigned long long)disk_stat_read(gp, sectors[1]),
- jiffies_to_msecs(disk_stat_read(gp, ticks[1])),
- gp->in_flight,
- jiffies_to_msecs(disk_stat_read(gp, io_ticks)),
- jiffies_to_msecs(disk_stat_read(gp, time_in_queue)));
-
- /* now show all non-0 size partitions of it */
- for (n = 0; n < gp->minors - 1; n++) {
- struct hd_struct *hd = gp->part[n];
-
- if (!hd || !hd->nr_sects)
- continue;
-
- preempt_disable();
- part_round_stats(hd);
- preempt_enable();
- seq_printf(s, "%4d %4d %s %lu %lu %llu "
+ disk_part_iter_init(&piter, gp, DISK_PITER_INCL_PART0);
+ while ((hd = disk_part_iter_next(&piter))) {
+ cpu = part_stat_lock();
+ part_round_stats(cpu, hd);
+ part_stat_unlock();
+ seq_printf(seqf, "%4d %7d %s %lu %lu %llu "
"%u %lu %lu %llu %u %u %u %u\n",
- gp->major, n + gp->first_minor + 1,
- disk_name(gp, n + 1, buf),
+ MAJOR(part_devt(hd)), MINOR(part_devt(hd)),
+ disk_name(gp, hd->partno, buf),
part_stat_read(hd, ios[0]),
part_stat_read(hd, merges[0]),
(unsigned long long)part_stat_read(hd, sectors[0]),
jiffies_to_msecs(part_stat_read(hd, time_in_queue))
);
}
+ disk_part_iter_exit(&piter);
return 0;
}
const struct seq_operations diskstats_op = {
- .start = diskstats_start,
- .next = diskstats_next,
- .stop = diskstats_stop,
+ .start = disk_seqf_start,
+ .next = disk_seqf_next,
+ .stop = disk_seqf_stop,
.show = diskstats_show
};
#endif /* CONFIG_PROC_FS */
* set enviroment vars to indicate which event this is for
* so that user space will know to go check the media status.
*/
- kobject_uevent_env(&gd->dev.kobj, KOBJ_CHANGE, envp);
+ kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp);
put_device(gd->driverfs_dev);
}
EXPORT_SYMBOL_GPL(genhd_media_change_notify);
#endif /* 0 */
-struct find_block {
- const char *name;
- int part;
-};
-
-static int match_id(struct device *dev, void *data)
+dev_t blk_lookup_devt(const char *name, int partno)
{
- struct find_block *find = data;
+ dev_t devt = MKDEV(0, 0);
+ struct class_dev_iter iter;
+ struct device *dev;
- if (dev->type != &disk_type)
- return 0;
- if (strcmp(dev->bus_id, find->name) == 0) {
+ class_dev_iter_init(&iter, &block_class, NULL, &disk_type);
+ while ((dev = class_dev_iter_next(&iter))) {
struct gendisk *disk = dev_to_disk(dev);
- if (find->part < disk->minors)
- return 1;
- }
- return 0;
-}
+ struct hd_struct *part;
-dev_t blk_lookup_devt(const char *name, int part)
-{
- struct device *dev;
- dev_t devt = MKDEV(0, 0);
- struct find_block find;
+ if (strcmp(dev->bus_id, name))
+ continue;
- mutex_lock(&block_class_lock);
- find.name = name;
- find.part = part;
- dev = class_find_device(&block_class, NULL, &find, match_id);
- if (dev) {
- put_device(dev);
- devt = MKDEV(MAJOR(dev->devt),
- MINOR(dev->devt) + part);
+ part = disk_get_part(disk, partno);
+ if (part) {
+ devt = part_devt(part);
+ disk_put_part(part);
+ break;
+ }
+ disk_put_part(part);
}
- mutex_unlock(&block_class_lock);
-
+ class_dev_iter_exit(&iter);
return devt;
}
EXPORT_SYMBOL(blk_lookup_devt);
{
return alloc_disk_node(minors, -1);
}
+EXPORT_SYMBOL(alloc_disk);
struct gendisk *alloc_disk_node(int minors, int node_id)
{
disk = kmalloc_node(sizeof(struct gendisk),
GFP_KERNEL | __GFP_ZERO, node_id);
if (disk) {
- if (!init_disk_stats(disk)) {
+ if (!init_part_stats(&disk->part0)) {
kfree(disk);
return NULL;
}
- if (minors > 1) {
- int size = (minors - 1) * sizeof(struct hd_struct *);
- disk->part = kmalloc_node(size,
- GFP_KERNEL | __GFP_ZERO, node_id);
- if (!disk->part) {
- free_disk_stats(disk);
- kfree(disk);
- return NULL;
- }
+ if (disk_expand_part_tbl(disk, 0)) {
+ free_part_stats(&disk->part0);
+ kfree(disk);
+ return NULL;
}
+ disk->part_tbl->part[0] = &disk->part0;
+
disk->minors = minors;
rand_initialize_disk(disk);
- disk->dev.class = &block_class;
- disk->dev.type = &disk_type;
- device_initialize(&disk->dev);
+ disk_to_dev(disk)->class = &block_class;
+ disk_to_dev(disk)->type = &disk_type;
+ device_initialize(disk_to_dev(disk));
INIT_WORK(&disk->async_notify,
media_change_notify_thread);
+ disk->node_id = node_id;
}
return disk;
}
-
-EXPORT_SYMBOL(alloc_disk);
EXPORT_SYMBOL(alloc_disk_node);
struct kobject *get_disk(struct gendisk *disk)
owner = disk->fops->owner;
if (owner && !try_module_get(owner))
return NULL;
- kobj = kobject_get(&disk->dev.kobj);
+ kobj = kobject_get(&disk_to_dev(disk)->kobj);
if (kobj == NULL) {
module_put(owner);
return NULL;
void put_disk(struct gendisk *disk)
{
if (disk)
- kobject_put(&disk->dev.kobj);
+ kobject_put(&disk_to_dev(disk)->kobj);
}
EXPORT_SYMBOL(put_disk);
void set_device_ro(struct block_device *bdev, int flag)
{
- if (bdev->bd_contains != bdev)
- bdev->bd_part->policy = flag;
- else
- bdev->bd_disk->policy = flag;
+ bdev->bd_part->policy = flag;
}
EXPORT_SYMBOL(set_device_ro);
void set_disk_ro(struct gendisk *disk, int flag)
{
- int i;
- disk->policy = flag;
- for (i = 0; i < disk->minors - 1; i++)
- if (disk->part[i]) disk->part[i]->policy = flag;
+ struct disk_part_iter piter;
+ struct hd_struct *part;
+
+ disk_part_iter_init(&piter, disk,
+ DISK_PITER_INCL_EMPTY | DISK_PITER_INCL_PART0);
+ while ((part = disk_part_iter_next(&piter)))
+ part->policy = flag;
+ disk_part_iter_exit(&piter);
}
EXPORT_SYMBOL(set_disk_ro);
{
if (!bdev)
return 0;
- else if (bdev->bd_contains != bdev)
- return bdev->bd_part->policy;
- else
- return bdev->bd_disk->policy;
+ return bdev->bd_part->policy;
}
EXPORT_SYMBOL(bdev_read_only);
-int invalidate_partition(struct gendisk *disk, int index)
+int invalidate_partition(struct gendisk *disk, int partno)
{
int res = 0;
- struct block_device *bdev = bdget_disk(disk, index);
+ struct block_device *bdev = bdget_disk(disk, partno);
if (bdev) {
fsync_bdev(bdev);
res = __invalidate_device(bdev);
{
struct block_device *bdevp;
struct gendisk *disk;
+ struct hd_struct *part;
struct blkpg_ioctl_arg a;
struct blkpg_partition p;
+ struct disk_part_iter piter;
long long start, length;
- int part;
- int i;
+ int partno;
int err;
if (!capable(CAP_SYS_ADMIN))
disk = bdev->bd_disk;
if (bdev != bdev->bd_contains)
return -EINVAL;
- part = p.pno;
- if (part <= 0 || part >= disk->minors)
+ partno = p.pno;
+ if (partno <= 0)
return -EINVAL;
switch (a.op) {
case BLKPG_ADD_PARTITION:
|| pstart < 0 || plength < 0)
return -EINVAL;
}
- /* partition number in use? */
+
mutex_lock(&bdev->bd_mutex);
- if (disk->part[part - 1]) {
- mutex_unlock(&bdev->bd_mutex);
- return -EBUSY;
- }
- /* overlap? */
- for (i = 0; i < disk->minors - 1; i++) {
- struct hd_struct *s = disk->part[i];
- if (!s)
- continue;
- if (!(start+length <= s->start_sect ||
- start >= s->start_sect + s->nr_sects)) {
+ /* overlap? */
+ disk_part_iter_init(&piter, disk,
+ DISK_PITER_INCL_EMPTY);
+ while ((part = disk_part_iter_next(&piter))) {
+ if (!(start + length <= part->start_sect ||
+ start >= part->start_sect + part->nr_sects)) {
+ disk_part_iter_exit(&piter);
mutex_unlock(&bdev->bd_mutex);
return -EBUSY;
}
}
+ disk_part_iter_exit(&piter);
+
/* all seems OK */
- err = add_partition(disk, part, start, length, ADDPART_FLAG_NONE);
+ err = add_partition(disk, partno, start, length,
+ ADDPART_FLAG_NONE);
mutex_unlock(&bdev->bd_mutex);
return err;
case BLKPG_DEL_PARTITION:
- if (!disk->part[part-1])
- return -ENXIO;
- if (disk->part[part - 1]->nr_sects == 0)
+ part = disk_get_part(disk, partno);
+ if (!part)
return -ENXIO;
- bdevp = bdget_disk(disk, part);
+
+ bdevp = bdget(part_devt(part));
+ disk_put_part(part);
if (!bdevp)
return -ENOMEM;
+
mutex_lock(&bdevp->bd_mutex);
if (bdevp->bd_openers) {
mutex_unlock(&bdevp->bd_mutex);
invalidate_bdev(bdevp);
mutex_lock_nested(&bdev->bd_mutex, 1);
- delete_partition(disk, part);
+ delete_partition(disk, partno);
mutex_unlock(&bdev->bd_mutex);
mutex_unlock(&bdevp->bd_mutex);
bdput(bdevp);
struct gendisk *disk = bdev->bd_disk;
int res;
- if (disk->minors == 1 || bdev != bdev->bd_contains)
+ if (!disk_partitionable(disk) || bdev != bdev->bd_contains)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
return res;
}
+static void blk_ioc_discard_endio(struct bio *bio, int err)
+{
+ if (err) {
+ if (err == -EOPNOTSUPP)
+ set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
+ clear_bit(BIO_UPTODATE, &bio->bi_flags);
+ }
+ complete(bio->bi_private);
+}
+
+static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
+ uint64_t len)
+{
+ struct request_queue *q = bdev_get_queue(bdev);
+ int ret = 0;
+
+ if (start & 511)
+ return -EINVAL;
+ if (len & 511)
+ return -EINVAL;
+ start >>= 9;
+ len >>= 9;
+
+ if (start + len > (bdev->bd_inode->i_size >> 9))
+ return -EINVAL;
+
+ if (!q->prepare_discard_fn)
+ return -EOPNOTSUPP;
+
+ while (len && !ret) {
+ DECLARE_COMPLETION_ONSTACK(wait);
+ struct bio *bio;
+
+ bio = bio_alloc(GFP_KERNEL, 0);
+ if (!bio)
+ return -ENOMEM;
+
+ bio->bi_end_io = blk_ioc_discard_endio;
+ bio->bi_bdev = bdev;
+ bio->bi_private = &wait;
+ bio->bi_sector = start;
+
+ if (len > q->max_hw_sectors) {
+ bio->bi_size = q->max_hw_sectors << 9;
+ len -= q->max_hw_sectors;
+ start += q->max_hw_sectors;
+ } else {
+ bio->bi_size = len << 9;
+ len = 0;
+ }
+ submit_bio(DISCARD_NOBARRIER, bio);
+
+ wait_for_completion(&wait);
+
+ if (bio_flagged(bio, BIO_EOPNOTSUPP))
+ ret = -EOPNOTSUPP;
+ else if (!bio_flagged(bio, BIO_UPTODATE))
+ ret = -EIO;
+ bio_put(bio);
+ }
+ return ret;
+}
+
static int put_ushort(unsigned long arg, unsigned short val)
{
return put_user(val, (unsigned short __user *)arg);
set_device_ro(bdev, n);
unlock_kernel();
return 0;
+
+ case BLKDISCARD: {
+ uint64_t range[2];
+
+ if (!(file->f_mode & FMODE_WRITE))
+ return -EBADF;
+
+ if (copy_from_user(range, (void __user *)arg, sizeof(range)))
+ return -EFAULT;
+
+ return blk_ioctl_discard(bdev, range[0], range[1]);
+ }
+
case HDIO_GETGEO: {
struct hd_geometry geo;
__set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
__set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
__set_bit(GPCMD_SET_STREAMING, filter->write_ok);
+ __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
}
EXPORT_SYMBOL_GPL(blk_set_cmd_filter_defaults);
goto out;
}
- ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count,
- hdr->dxfer_len);
+ ret = blk_rq_map_user_iov(q, rq, NULL, iov, hdr->iovec_count,
+ hdr->dxfer_len, GFP_KERNEL);
kfree(iov);
} else if (hdr->dxfer_len)
- ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
+ ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
+ GFP_KERNEL);
if (ret)
goto out;
*/
#include <linux/kernel.h>
+#include <linux/blkdev.h>
#include <linux/pci.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
-enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
+enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
{
struct Scsi_Host *host = cmd->device->host;
struct ata_port *ap = ata_shost_to_port(host);
unsigned long flags;
struct ata_queued_cmd *qc;
- enum scsi_eh_timer_return ret;
+ enum blk_eh_timer_return ret;
DPRINTK("ENTER\n");
if (ap->ops->error_handler) {
- ret = EH_NOT_HANDLED;
+ ret = BLK_EH_NOT_HANDLED;
goto out;
}
- ret = EH_HANDLED;
+ ret = BLK_EH_HANDLED;
spin_lock_irqsave(ap->lock, flags);
qc = ata_qc_from_tag(ap, ap->link.active_tag);
if (qc) {
WARN_ON(qc->scsicmd != cmd);
qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
qc->err_mask |= AC_ERR_TIMEOUT;
- ret = EH_NOT_HANDLED;
+ ret = BLK_EH_NOT_HANDLED;
}
spin_unlock_irqrestore(ap->lock, flags);
* Note that ATA_QCFLAG_FAILED is unconditionally set after
* this function completes.
*/
- scsi_req_abort_cmd(qc->scsicmd);
+ blk_abort_request(qc->scsicmd->request);
}
/**
blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
} else {
+ if (ata_id_is_ssd(dev->id))
+ queue_flag_set_unlocked(QUEUE_FLAG_NONROT,
+ sdev->request_queue);
+
/* ATA devices must be sector aligned */
blk_queue_update_dma_alignment(sdev->request_queue,
ATA_SECT_SIZE - 1);
/* libata-eh.c */
extern unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd);
extern void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd);
-extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
+extern enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
extern void ata_scsi_error(struct Scsi_Host *host);
extern void ata_port_wait_eh(struct ata_port *ap);
extern void ata_eh_fastdrain_timerfn(unsigned long arg);
*/
struct class_private {
struct kset class_subsys;
- struct list_head class_devices;
+ struct klist class_devices;
struct list_head class_interfaces;
struct kset class_dirs;
struct mutex class_mutex;
}
}
+static void klist_class_dev_get(struct klist_node *n)
+{
+ struct device *dev = container_of(n, struct device, knode_class);
+
+ get_device(dev);
+}
+
+static void klist_class_dev_put(struct klist_node *n)
+{
+ struct device *dev = container_of(n, struct device, knode_class);
+
+ put_device(dev);
+}
+
int __class_register(struct class *cls, struct lock_class_key *key)
{
struct class_private *cp;
cp = kzalloc(sizeof(*cp), GFP_KERNEL);
if (!cp)
return -ENOMEM;
- INIT_LIST_HEAD(&cp->class_devices);
+ klist_init(&cp->class_devices, klist_class_dev_get, klist_class_dev_put);
INIT_LIST_HEAD(&cp->class_interfaces);
kset_init(&cp->class_dirs);
__mutex_init(&cp->class_mutex, "struct class mutex", key);
}
#endif
+/**
+ * class_dev_iter_init - initialize class device iterator
+ * @iter: class iterator to initialize
+ * @class: the class we wanna iterate over
+ * @start: the device to start iterating from, if any
+ * @type: device_type of the devices to iterate over, NULL for all
+ *
+ * Initialize class iterator @iter such that it iterates over devices
+ * of @class. If @start is set, the list iteration will start there,
+ * otherwise if it is NULL, the iteration starts at the beginning of
+ * the list.
+ */
+void class_dev_iter_init(struct class_dev_iter *iter, struct class *class,
+ struct device *start, const struct device_type *type)
+{
+ struct klist_node *start_knode = NULL;
+
+ if (start)
+ start_knode = &start->knode_class;
+ klist_iter_init_node(&class->p->class_devices, &iter->ki, start_knode);
+ iter->type = type;
+}
+EXPORT_SYMBOL_GPL(class_dev_iter_init);
+
+/**
+ * class_dev_iter_next - iterate to the next device
+ * @iter: class iterator to proceed
+ *
+ * Proceed @iter to the next device and return it. Returns NULL if
+ * iteration is complete.
+ *
+ * The returned device is referenced and won't be released till
+ * iterator is proceed to the next device or exited. The caller is
+ * free to do whatever it wants to do with the device including
+ * calling back into class code.
+ */
+struct device *class_dev_iter_next(struct class_dev_iter *iter)
+{
+ struct klist_node *knode;
+ struct device *dev;
+
+ while (1) {
+ knode = klist_next(&iter->ki);
+ if (!knode)
+ return NULL;
+ dev = container_of(knode, struct device, knode_class);
+ if (!iter->type || iter->type == dev->type)
+ return dev;
+ }
+}
+EXPORT_SYMBOL_GPL(class_dev_iter_next);
+
+/**
+ * class_dev_iter_exit - finish iteration
+ * @iter: class iterator to finish
+ *
+ * Finish an iteration. Always call this function after iteration is
+ * complete whether the iteration ran till the end or not.
+ */
+void class_dev_iter_exit(struct class_dev_iter *iter)
+{
+ klist_iter_exit(&iter->ki);
+}
+EXPORT_SYMBOL_GPL(class_dev_iter_exit);
+
/**
* class_for_each_device - device iterator
* @class: the class we're iterating
* We check the return of @fn each time. If it returns anything
* other than 0, we break out and return that value.
*
- * Note, we hold class->class_mutex in this function, so it can not be
- * re-acquired in @fn, otherwise it will self-deadlocking. For
- * example, calls to add or remove class members would be verboten.
+ * @fn is allowed to do anything including calling back into class
+ * code. There's no locking restriction.
*/
int class_for_each_device(struct class *class, struct device *start,
void *data, int (*fn)(struct device *, void *))
{
+ struct class_dev_iter iter;
struct device *dev;
int error = 0;
return -EINVAL;
}
- mutex_lock(&class->p->class_mutex);
- list_for_each_entry(dev, &class->p->class_devices, node) {
- if (start) {
- if (start == dev)
- start = NULL;
- continue;
- }
- dev = get_device(dev);
+ class_dev_iter_init(&iter, class, start, NULL);
+ while ((dev = class_dev_iter_next(&iter))) {
error = fn(dev, data);
- put_device(dev);
if (error)
break;
}
- mutex_unlock(&class->p->class_mutex);
+ class_dev_iter_exit(&iter);
return error;
}
*
* Note, you will need to drop the reference with put_device() after use.
*
- * We hold class->class_mutex in this function, so it can not be
- * re-acquired in @match, otherwise it will self-deadlocking. For
- * example, calls to add or remove class members would be verboten.
+ * @fn is allowed to do anything including calling back into class
+ * code. There's no locking restriction.
*/
struct device *class_find_device(struct class *class, struct device *start,
void *data,
int (*match)(struct device *, void *))
{
+ struct class_dev_iter iter;
struct device *dev;
- int found = 0;
if (!class)
return NULL;
return NULL;
}
- mutex_lock(&class->p->class_mutex);
- list_for_each_entry(dev, &class->p->class_devices, node) {
- if (start) {
- if (start == dev)
- start = NULL;
- continue;
- }
- dev = get_device(dev);
+ class_dev_iter_init(&iter, class, start, NULL);
+ while ((dev = class_dev_iter_next(&iter))) {
if (match(dev, data)) {
- found = 1;
+ get_device(dev);
break;
- } else
- put_device(dev);
+ }
}
- mutex_unlock(&class->p->class_mutex);
+ class_dev_iter_exit(&iter);
- return found ? dev : NULL;
+ return dev;
}
EXPORT_SYMBOL_GPL(class_find_device);
int class_interface_register(struct class_interface *class_intf)
{
struct class *parent;
+ struct class_dev_iter iter;
struct device *dev;
if (!class_intf || !class_intf->class)
mutex_lock(&parent->p->class_mutex);
list_add_tail(&class_intf->node, &parent->p->class_interfaces);
if (class_intf->add_dev) {
- list_for_each_entry(dev, &parent->p->class_devices, node)
+ class_dev_iter_init(&iter, parent, NULL, NULL);
+ while ((dev = class_dev_iter_next(&iter)))
class_intf->add_dev(dev, class_intf);
+ class_dev_iter_exit(&iter);
}
mutex_unlock(&parent->p->class_mutex);
void class_interface_unregister(struct class_interface *class_intf)
{
struct class *parent = class_intf->class;
+ struct class_dev_iter iter;
struct device *dev;
if (!parent)
mutex_lock(&parent->p->class_mutex);
list_del_init(&class_intf->node);
if (class_intf->remove_dev) {
- list_for_each_entry(dev, &parent->p->class_devices, node)
+ class_dev_iter_init(&iter, parent, NULL, NULL);
+ while ((dev = class_dev_iter_next(&iter)))
class_intf->remove_dev(dev, class_intf);
+ class_dev_iter_exit(&iter);
}
mutex_unlock(&parent->p->class_mutex);
klist_init(&dev->klist_children, klist_children_get,
klist_children_put);
INIT_LIST_HEAD(&dev->dma_pools);
- INIT_LIST_HEAD(&dev->node);
init_MUTEX(&dev->sem);
spin_lock_init(&dev->devres_lock);
INIT_LIST_HEAD(&dev->devres_head);
if (dev->class) {
mutex_lock(&dev->class->p->class_mutex);
/* tie the class to the device */
- list_add_tail(&dev->node, &dev->class->p->class_devices);
+ klist_add_tail(&dev->knode_class,
+ &dev->class->p->class_devices);
/* notify any interfaces that the device is here */
list_for_each_entry(class_intf,
if (class_intf->remove_dev)
class_intf->remove_dev(dev, class_intf);
/* remove the device from the class list */
- list_del_init(&dev->node);
+ klist_del(&dev->knode_class);
mutex_unlock(&dev->class->p->class_mutex);
}
device_remove_file(dev, &uevent_attr);
static int
aoedisk_add_sysfs(struct aoedev *d)
{
- return sysfs_create_group(&d->gd->dev.kobj, &attr_group);
+ return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
}
void
aoedisk_rm_sysfs(struct aoedev *d)
{
- sysfs_remove_group(&d->gd->dev.kobj, &attr_group);
+ sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
}
static int
gd->first_minor = d->sysminor * AOE_PARTITIONS;
gd->fops = &aoe_bdops;
gd->private_data = d;
- gd->capacity = d->ssize;
+ set_capacity(gd, d->ssize);
snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
d->aoemajor, d->aoeminor);
unsigned long flags;
u64 ssize;
- ssize = d->gd->capacity;
+ ssize = get_capacity(d->gd);
bd = bdget_disk(d->gd, 0);
if (bd) {
if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE))
return;
if (d->gd != NULL) {
- d->gd->capacity = ssize;
+ set_capacity(d->gd, ssize);
d->flags |= DEVFL_NEWSIZE;
} else
d->flags |= DEVFL_GDALLOC;
unsigned long n_sect = bio->bi_size >> 9;
const int rw = bio_data_dir(bio);
struct hd_struct *part;
+ int cpu;
- part = get_part(disk, sector);
- all_stat_inc(disk, part, ios[rw], sector);
- all_stat_add(disk, part, ticks[rw], duration, sector);
- all_stat_add(disk, part, sectors[rw], n_sect, sector);
- all_stat_add(disk, part, io_ticks, duration, sector);
+ cpu = part_stat_lock();
+ part = disk_map_sector_rcu(disk, sector);
+
+ part_stat_inc(cpu, part, ios[rw]);
+ part_stat_add(cpu, part, ticks[rw], duration);
+ part_stat_add(cpu, part, sectors[rw], n_sect);
+ part_stat_add(cpu, part, io_ticks, duration);
+
+ part_stat_unlock();
}
void
}
if (d->gd)
- d->gd->capacity = 0;
+ set_capacity(d->gd, 0);
d->flags &= ~DEVFL_UP;
}
hba[i]->intr[SIMPLE_MODE_INT], dac ? "" : " not");
hba[i]->cmd_pool_bits =
- kmalloc(((hba[i]->nr_cmds + BITS_PER_LONG -
- 1) / BITS_PER_LONG) * sizeof(unsigned long), GFP_KERNEL);
+ kmalloc(DIV_ROUND_UP(hba[i]->nr_cmds, BITS_PER_LONG)
+ * sizeof(unsigned long), GFP_KERNEL);
hba[i]->cmd_pool = (CommandList_struct *)
pci_alloc_consistent(hba[i]->pdev,
hba[i]->nr_cmds * sizeof(CommandList_struct),
/* command and error info recs zeroed out before
they are used */
memset(hba[i]->cmd_pool_bits, 0,
- ((hba[i]->nr_cmds + BITS_PER_LONG -
- 1) / BITS_PER_LONG) * sizeof(unsigned long));
+ DIV_ROUND_UP(hba[i]->nr_cmds, BITS_PER_LONG)
+ * sizeof(unsigned long));
hba[i]->num_luns = 0;
hba[i]->highest_lun = -1;
static int
cciss_scsi_add_entry(int ctlr, int hostno,
- unsigned char *scsi3addr, int devtype,
+ struct cciss_scsi_dev_t *device,
struct scsi2map *added, int *nadded)
{
/* assumes hba[ctlr]->scsi_ctlr->lock is held */
lun = 0;
/* Is this device a non-zero lun of a multi-lun device */
/* byte 4 of the 8-byte LUN addr will contain the logical unit no. */
- if (scsi3addr[4] != 0) {
+ if (device->scsi3addr[4] != 0) {
/* Search through our list and find the device which */
/* has the same 8 byte LUN address, excepting byte 4. */
/* Assign the same bus and target for this new LUN. */
/* Use the logical unit number from the firmware. */
- memcpy(addr1, scsi3addr, 8);
+ memcpy(addr1, device->scsi3addr, 8);
addr1[4] = 0;
for (i = 0; i < n; i++) {
sd = &ccissscsi[ctlr].dev[i];
if (memcmp(addr1, addr2, 8) == 0) {
bus = sd->bus;
target = sd->target;
- lun = scsi3addr[4];
+ lun = device->scsi3addr[4];
break;
}
}
added[*nadded].lun = sd->lun;
(*nadded)++;
- memcpy(&sd->scsi3addr[0], scsi3addr, 8);
- sd->devtype = devtype;
+ memcpy(sd->scsi3addr, device->scsi3addr, 8);
+ memcpy(sd->vendor, device->vendor, sizeof(sd->vendor));
+ memcpy(sd->revision, device->revision, sizeof(sd->revision));
+ memcpy(sd->device_id, device->device_id, sizeof(sd->device_id));
+ sd->devtype = device->devtype;
+
ccissscsi[ctlr].ndevices++;
/* initially, (before registering with scsi layer) we don't
CPQ_TAPE_UNLOCK(ctlr, flags);
}
+static int device_is_the_same(struct cciss_scsi_dev_t *dev1,
+ struct cciss_scsi_dev_t *dev2)
+{
+ return dev1->devtype == dev2->devtype &&
+ memcmp(dev1->scsi3addr, dev2->scsi3addr,
+ sizeof(dev1->scsi3addr)) == 0 &&
+ memcmp(dev1->device_id, dev2->device_id,
+ sizeof(dev1->device_id)) == 0 &&
+ memcmp(dev1->vendor, dev2->vendor,
+ sizeof(dev1->vendor)) == 0 &&
+ memcmp(dev1->model, dev2->model,
+ sizeof(dev1->model)) == 0 &&
+ memcmp(dev1->revision, dev2->revision,
+ sizeof(dev1->revision)) == 0;
+}
+
static int
adjust_cciss_scsi_table(int ctlr, int hostno,
struct cciss_scsi_dev_t sd[], int nsds)
for (j=0;j<nsds;j++) {
if (SCSI3ADDR_EQ(sd[j].scsi3addr,
csd->scsi3addr)) {
- if (sd[j].devtype == csd->devtype)
+ if (device_is_the_same(&sd[j], csd))
found=2;
else
found=1;
cciss_scsi_remove_entry(ctlr, hostno, i,
removed, &nremoved);
/* remove ^^^, hence i not incremented */
- }
- else if (found == 1) { /* device is different kind */
+ } else if (found == 1) { /* device is different in some way */
changes++;
- printk("cciss%d: device c%db%dt%dl%d type changed "
- "(device type now %s).\n",
- ctlr, hostno, csd->bus, csd->target, csd->lun,
- scsi_device_type(csd->devtype));
+ printk("cciss%d: device c%db%dt%dl%d has changed.\n",
+ ctlr, hostno, csd->bus, csd->target, csd->lun);
cciss_scsi_remove_entry(ctlr, hostno, i,
removed, &nremoved);
/* remove ^^^, hence i not incremented */
- if (cciss_scsi_add_entry(ctlr, hostno,
- &sd[j].scsi3addr[0], sd[j].devtype,
+ if (cciss_scsi_add_entry(ctlr, hostno, &sd[j],
added, &nadded) != 0)
/* we just removed one, so add can't fail. */
BUG();
csd->devtype = sd[j].devtype;
+ memcpy(csd->device_id, sd[j].device_id,
+ sizeof(csd->device_id));
+ memcpy(csd->vendor, sd[j].vendor,
+ sizeof(csd->vendor));
+ memcpy(csd->model, sd[j].model,
+ sizeof(csd->model));
+ memcpy(csd->revision, sd[j].revision,
+ sizeof(csd->revision));
} else /* device is same as it ever was, */
i++; /* so just move along. */
}
csd = &ccissscsi[ctlr].dev[j];
if (SCSI3ADDR_EQ(sd[i].scsi3addr,
csd->scsi3addr)) {
- if (sd[i].devtype == csd->devtype)
+ if (device_is_the_same(&sd[i], csd))
found=2; /* found device */
else
found=1; /* found a bug. */
}
if (!found) {
changes++;
- if (cciss_scsi_add_entry(ctlr, hostno,
-
- &sd[i].scsi3addr[0], sd[i].devtype,
+ if (cciss_scsi_add_entry(ctlr, hostno, &sd[i],
added, &nadded) != 0)
break;
} else if (found == 1) {
/* should never happen... */
changes++;
- printk("cciss%d: device unexpectedly changed type\n",
- ctlr);
+ printk(KERN_WARNING "cciss%d: device "
+ "unexpectedly changed\n", ctlr);
/* but if it does happen, we just ignore that device */
}
}
static int
cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr,
- unsigned char *buf, unsigned char bufsize)
+ unsigned char page, unsigned char *buf,
+ unsigned char bufsize)
{
int rc;
CommandList_struct *cp;
ei = cp->err_info;
cdb[0] = CISS_INQUIRY;
- cdb[1] = 0;
- cdb[2] = 0;
+ cdb[1] = (page != 0);
+ cdb[2] = page;
cdb[3] = 0;
cdb[4] = bufsize;
cdb[5] = 0;
return rc;
}
+/* Get the device id from inquiry page 0x83 */
+static int cciss_scsi_get_device_id(ctlr_info_t *c, unsigned char *scsi3addr,
+ unsigned char *device_id, int buflen)
+{
+ int rc;
+ unsigned char *buf;
+
+ if (buflen > 16)
+ buflen = 16;
+ buf = kzalloc(64, GFP_KERNEL);
+ if (!buf)
+ return -1;
+ rc = cciss_scsi_do_inquiry(c, scsi3addr, 0x83, buf, 64);
+ if (rc == 0)
+ memcpy(device_id, &buf[8], buflen);
+ kfree(buf);
+ return rc != 0;
+}
+
static int
cciss_scsi_do_report_phys_luns(ctlr_info_t *c,
ReportLunData_struct *buf, int bufsize)
ctlr_info_t *c;
__u32 num_luns=0;
unsigned char *ch;
- /* unsigned char found[CCISS_MAX_SCSI_DEVS_PER_HBA]; */
- struct cciss_scsi_dev_t currentsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
+ struct cciss_scsi_dev_t *currentsd, *this_device;
int ncurrent=0;
int reportlunsize = sizeof(*ld_buff) + CISS_MAX_PHYS_LUN * 8;
int i;
c = (ctlr_info_t *) hba[cntl_num];
ld_buff = kzalloc(reportlunsize, GFP_KERNEL);
- if (ld_buff == NULL) {
- printk(KERN_ERR "cciss: out of memory\n");
- return;
- }
inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
- if (inq_buff == NULL) {
- printk(KERN_ERR "cciss: out of memory\n");
- kfree(ld_buff);
- return;
+ currentsd = kzalloc(sizeof(*currentsd) *
+ (CCISS_MAX_SCSI_DEVS_PER_HBA+1), GFP_KERNEL);
+ if (ld_buff == NULL || inq_buff == NULL || currentsd == NULL) {
+ printk(KERN_ERR "cciss: out of memory\n");
+ goto out;
}
-
+ this_device = ¤tsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
if (cciss_scsi_do_report_phys_luns(c, ld_buff, reportlunsize) == 0) {
ch = &ld_buff->LUNListLength[0];
num_luns = ((ch[0]<<24) | (ch[1]<<16) | (ch[2]<<8) | ch[3]) / 8;
/* adjust our table of devices */
- for(i=0; i<num_luns; i++)
- {
- int devtype;
-
+ for (i = 0; i < num_luns; i++) {
/* for each physical lun, do an inquiry */
if (ld_buff->LUN[i][3] & 0xC0) continue;
memset(inq_buff, 0, OBDR_TAPE_INQ_SIZE);
memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8);
- if (cciss_scsi_do_inquiry(hba[cntl_num], scsi3addr, inq_buff,
- (unsigned char) OBDR_TAPE_INQ_SIZE) != 0) {
+ if (cciss_scsi_do_inquiry(hba[cntl_num], scsi3addr, 0, inq_buff,
+ (unsigned char) OBDR_TAPE_INQ_SIZE) != 0)
/* Inquiry failed (msg printed already) */
- devtype = 0; /* so we will skip this device. */
- } else /* what kind of device is this? */
- devtype = (inq_buff[0] & 0x1f);
-
- switch (devtype)
+ continue; /* so we will skip this device. */
+
+ this_device->devtype = (inq_buff[0] & 0x1f);
+ this_device->bus = -1;
+ this_device->target = -1;
+ this_device->lun = -1;
+ memcpy(this_device->scsi3addr, scsi3addr, 8);
+ memcpy(this_device->vendor, &inq_buff[8],
+ sizeof(this_device->vendor));
+ memcpy(this_device->model, &inq_buff[16],
+ sizeof(this_device->model));
+ memcpy(this_device->revision, &inq_buff[32],
+ sizeof(this_device->revision));
+ memset(this_device->device_id, 0,
+ sizeof(this_device->device_id));
+ cciss_scsi_get_device_id(hba[cntl_num], scsi3addr,
+ this_device->device_id, sizeof(this_device->device_id));
+
+ switch (this_device->devtype)
{
case 0x05: /* CD-ROM */ {
if (ncurrent >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
printk(KERN_INFO "cciss%d: %s ignored, "
"too many devices.\n", cntl_num,
- scsi_device_type(devtype));
+ scsi_device_type(this_device->devtype));
break;
}
- memcpy(¤tsd[ncurrent].scsi3addr[0],
- &scsi3addr[0], 8);
- currentsd[ncurrent].devtype = devtype;
- currentsd[ncurrent].bus = -1;
- currentsd[ncurrent].target = -1;
- currentsd[ncurrent].lun = -1;
+ currentsd[ncurrent] = *this_device;
ncurrent++;
break;
default:
out:
kfree(inq_buff);
kfree(ld_buff);
+ kfree(currentsd);
return;
}
int devtype;
int bus, target, lun; /* as presented to the OS */
unsigned char scsi3addr[8]; /* as presented to the HW */
+ unsigned char device_id[16]; /* from inquiry pg. 0x83 */
+ unsigned char vendor[8]; /* bytes 8-15 of inquiry data */
+ unsigned char model[16]; /* bytes 16-31 of inquiry data */
+ unsigned char revision[4]; /* bytes 32-35 of inquiry data */
};
struct cciss_scsi_hba_t {
hba[i]->pci_dev, NR_CMDS * sizeof(cmdlist_t),
&(hba[i]->cmd_pool_dhandle));
hba[i]->cmd_pool_bits = kcalloc(
- (NR_CMDS+BITS_PER_LONG-1)/BITS_PER_LONG, sizeof(unsigned long),
+ DIV_ROUND_UP(NR_CMDS, BITS_PER_LONG), sizeof(unsigned long),
GFP_KERNEL);
if (!hba[i]->cmd_pool_bits || !hba[i]->cmd_pool)
* 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
* side 0 is on physical side 0 (but with the misnamed sector IDs).
* 'stretch' should probably be renamed to something more general, like
- * 'options'. Other parameters should be self-explanatory (see also
- * setfdprm(8)).
+ * 'options'.
+ *
+ * Bits 2 through 9 of 'stretch' tell the number of the first sector.
+ * The LSB (bit 2) is flipped. For most disks, the first sector
+ * is 1 (represented by 0x00<<2). For some CP/M and music sampler
+ * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
+ * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
+ *
+ * Other parameters should be self-explanatory (see also setfdprm(8)).
*/
/*
Size
}
/* Convert step rate from microseconds to milliseconds and 4 bits */
- srt = 16 - (DP->srt * scale_dtr / 1000 + NOMINAL_DTR - 1) / NOMINAL_DTR;
+ srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
if (slow_floppy) {
srt = srt / 4;
}
SUPBOUND(srt, 0xf);
INFBOUND(srt, 0);
- hlt = (DP->hlt * scale_dtr / 2 + NOMINAL_DTR - 1) / NOMINAL_DTR;
+ hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
if (hlt < 0x01)
hlt = 0x01;
else if (hlt > 0x7f)
hlt = hlt_max_code;
- hut = (DP->hut * scale_dtr / 16 + NOMINAL_DTR - 1) / NOMINAL_DTR;
+ hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
if (hut < 0x1)
hut = 0x1;
else if (hut > 0xf)
}
}
}
- if (_floppy->stretch & FD_ZEROBASED) {
+ if (_floppy->stretch & FD_SECTBASEMASK) {
for (count = 0; count < F_SECT_PER_TRACK; count++)
- here[count].sect--;
+ here[count].sect += FD_SECTBASE(_floppy) - 1;
}
}
#ifdef FLOPPY_SANITY_CHECK
if (nr_sectors / ssize >
- (in_sector_offset + current_count_sectors + ssize - 1) / ssize) {
+ DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
DPRINT("long rw: %x instead of %lx\n",
nr_sectors, current_count_sectors);
printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
}
HEAD = fsector_t / _floppy->sect;
- if (((_floppy->stretch & (FD_SWAPSIDES | FD_ZEROBASED)) ||
+ if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
TESTF(FD_NEED_TWADDLE)) && fsector_t < _floppy->sect)
max_sector = _floppy->sect;
CODE2SIZE;
SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
- ((_floppy->stretch & FD_ZEROBASED) ? 0 : 1);
+ FD_SECTBASE(_floppy);
/* tracksize describes the size which can be filled up with sectors
* of size ssize.
g->head <= 0 ||
g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
/* check if reserved bits are set */
- (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_ZEROBASED)) != 0)
+ (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
return -EINVAL;
if (type) {
if (!capable(CAP_SYS_ADMIN))
if (DRS->maxblock > user_params[drive].sect ||
DRS->maxtrack ||
((user_params[drive].sect ^ oldStretch) &
- (FD_SWAPSIDES | FD_ZEROBASED)))
+ (FD_SWAPSIDES | FD_SECTBASEMASK)))
invalidate_drive(bdev);
else
process_fd_request();
BUG_ON(lo->magic != LO_MAGIC);
lo->pid = current->pid;
- ret = sysfs_create_file(&lo->disk->dev.kobj, &pid_attr.attr);
+ ret = sysfs_create_file(&disk_to_dev(lo->disk)->kobj, &pid_attr.attr);
if (ret) {
printk(KERN_ERR "nbd: sysfs_create_file failed!");
return ret;
while ((req = nbd_read_stat(lo)) != NULL)
nbd_end_request(req);
- sysfs_remove_file(&lo->disk->dev.kobj, &pid_attr.attr);
+ sysfs_remove_file(&disk_to_dev(lo->disk)->kobj, &pid_attr.attr);
return 0;
}
if (last_zone != zone) {
BUG_ON(last_zone != zone + pd->settings.size);
first_sectors = last_zone - bio->bi_sector;
- bp = bio_split(bio, bio_split_pool, first_sectors);
+ bp = bio_split(bio, first_sectors);
BUG_ON(!bp);
pkt_make_request(q, &bp->bio1);
pkt_make_request(q, &bp->bio2);
if (!disk->queue)
goto out_mem2;
- pd->pkt_dev = MKDEV(disk->major, disk->first_minor);
+ pd->pkt_dev = MKDEV(pktdev_major, idx);
ret = pkt_new_dev(pd, dev);
if (ret)
goto out_new_dev;
if (blk_fs_request(req)) {
if (ps3disk_submit_request_sg(dev, req))
break;
- } else if (req->cmd_type == REQ_TYPE_FLUSH) {
+ } else if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
+ req->cmd[0] == REQ_LB_OP_FLUSH) {
if (ps3disk_submit_flush_request(dev, req))
break;
} else {
return IRQ_HANDLED;
}
- if (req->cmd_type == REQ_TYPE_FLUSH) {
+ if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
+ req->cmd[0] == REQ_LB_OP_FLUSH) {
read = 0;
num_sectors = req->hard_cur_sectors;
op = "flush";
dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
- req->cmd_type = REQ_TYPE_FLUSH;
+ req->cmd_type = REQ_TYPE_LINUX_BLOCK;
+ req->cmd[0] = REQ_LB_OP_FLUSH;
}
static unsigned long ps3disk_mask;
struct ps3disk_private *priv = dev->sbd.core.driver_data;
mutex_lock(&ps3disk_mask_mutex);
- __clear_bit(priv->gendisk->first_minor / PS3DISK_MINORS,
+ __clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
&ps3disk_mask);
mutex_unlock(&ps3disk_mask_mutex);
del_gendisk(priv->gendisk);
spin_lock_irqsave(&vblk->lock, flags);
while ((vbr = vblk->vq->vq_ops->get_buf(vblk->vq, &len)) != NULL) {
- int uptodate;
+ int error;
switch (vbr->status) {
case VIRTIO_BLK_S_OK:
- uptodate = 1;
+ error = 0;
break;
case VIRTIO_BLK_S_UNSUPP:
- uptodate = -ENOTTY;
+ error = -ENOTTY;
break;
default:
- uptodate = 0;
+ error = -EIO;
break;
}
- end_dequeued_request(vbr->req, uptodate);
+ __blk_end_request(vbr->req, error, blk_rq_bytes(vbr->req));
list_del(&vbr->list);
mempool_free(vbr, vblk->pool);
}
if (blk_fs_request(vbr->req)) {
vbr->out_hdr.type = 0;
vbr->out_hdr.sector = vbr->req->sector;
- vbr->out_hdr.ioprio = vbr->req->ioprio;
+ vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
} else if (blk_pc_request(vbr->req)) {
vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
vbr->out_hdr.sector = 0;
- vbr->out_hdr.ioprio = vbr->req->ioprio;
+ vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
} else {
/* We don't put anything else in the queue. */
BUG();
#define GRANT_INVALID_REF 0
#define PARTS_PER_DISK 16
+#define PARTS_PER_EXT_DISK 256
#define BLKIF_MAJOR(dev) ((dev)>>8)
#define BLKIF_MINOR(dev) ((dev) & 0xff)
-#define DEV_NAME "xvd" /* name in /dev */
+#define EXT_SHIFT 28
+#define EXTENDED (1<<EXT_SHIFT)
+#define VDEV_IS_EXTENDED(dev) ((dev)&(EXTENDED))
+#define BLKIF_MINOR_EXT(dev) ((dev)&(~EXTENDED))
-/* Information about our VBDs. */
-#define MAX_VBDS 64
-static LIST_HEAD(vbds_list);
+#define DEV_NAME "xvd" /* name in /dev */
static int get_id_from_freelist(struct blkfront_info *info)
{
}
-static int xlvbd_alloc_gendisk(int minor, blkif_sector_t capacity,
- int vdevice, u16 vdisk_info, u16 sector_size,
- struct blkfront_info *info)
+static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
+ struct blkfront_info *info,
+ u16 vdisk_info, u16 sector_size)
{
struct gendisk *gd;
int nr_minors = 1;
int err = -ENODEV;
+ unsigned int offset;
+ int minor;
+ int nr_parts;
BUG_ON(info->gd != NULL);
BUG_ON(info->rq != NULL);
- if ((minor % PARTS_PER_DISK) == 0)
- nr_minors = PARTS_PER_DISK;
+ if ((info->vdevice>>EXT_SHIFT) > 1) {
+ /* this is above the extended range; something is wrong */
+ printk(KERN_WARNING "blkfront: vdevice 0x%x is above the extended range; ignoring\n", info->vdevice);
+ return -ENODEV;
+ }
+
+ if (!VDEV_IS_EXTENDED(info->vdevice)) {
+ minor = BLKIF_MINOR(info->vdevice);
+ nr_parts = PARTS_PER_DISK;
+ } else {
+ minor = BLKIF_MINOR_EXT(info->vdevice);
+ nr_parts = PARTS_PER_EXT_DISK;
+ }
+
+ if ((minor % nr_parts) == 0)
+ nr_minors = nr_parts;
gd = alloc_disk(nr_minors);
if (gd == NULL)
goto out;
- if (nr_minors > 1)
- sprintf(gd->disk_name, "%s%c", DEV_NAME,
- 'a' + minor / PARTS_PER_DISK);
- else
- sprintf(gd->disk_name, "%s%c%d", DEV_NAME,
- 'a' + minor / PARTS_PER_DISK,
- minor % PARTS_PER_DISK);
+ offset = minor / nr_parts;
+
+ if (nr_minors > 1) {
+ if (offset < 26)
+ sprintf(gd->disk_name, "%s%c", DEV_NAME, 'a' + offset);
+ else
+ sprintf(gd->disk_name, "%s%c%c", DEV_NAME,
+ 'a' + ((offset / 26)-1), 'a' + (offset % 26));
+ } else {
+ if (offset < 26)
+ sprintf(gd->disk_name, "%s%c%d", DEV_NAME,
+ 'a' + offset,
+ minor & (nr_parts - 1));
+ else
+ sprintf(gd->disk_name, "%s%c%c%d", DEV_NAME,
+ 'a' + ((offset / 26) - 1),
+ 'a' + (offset % 26),
+ minor & (nr_parts - 1));
+ }
gd->major = XENVBD_MAJOR;
gd->first_minor = minor;
err = xenbus_scanf(XBT_NIL, dev->nodename,
"virtual-device", "%i", &vdevice);
if (err != 1) {
- xenbus_dev_fatal(dev, err, "reading virtual-device");
- return err;
+ /* go looking in the extended area instead */
+ err = xenbus_scanf(XBT_NIL, dev->nodename, "virtual-device-ext",
+ "%i", &vdevice);
+ if (err != 1) {
+ xenbus_dev_fatal(dev, err, "reading virtual-device");
+ return err;
+ }
}
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (err)
info->feature_barrier = 0;
- err = xlvbd_alloc_gendisk(BLKIF_MINOR(info->vdevice),
- sectors, info->vdevice,
- binfo, sector_size, info);
+ err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size);
if (err) {
xenbus_dev_fatal(info->xbdev, err, "xlvbd_add at %s",
info->xbdev->otherend);
len = nr * CD_FRAMESIZE_RAW;
- ret = blk_rq_map_user(q, rq, ubuf, len);
+ ret = blk_rq_map_user(q, rq, NULL, ubuf, len, GFP_KERNEL);
if (ret)
break;
ctrl_outb(1, GDROM_DMA_STATUS_REG);
wait_event_interruptible_timeout(request_queue,
gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
- err = gd.transfer;
+ err = gd.transfer ? -EIO : 0;
gd.transfer = 0;
gd.pending = 0;
/* now seek to take the request spinlock
* before handling ending the request */
spin_lock(&gdrom_lock);
list_del_init(&req->queuelist);
- end_dequeued_request(req, 1 - err);
+ __blk_end_request(req, err, blk_rq_bytes(req));
}
spin_unlock(&gdrom_lock);
kfree(read_command);
if (!disk || !disk->random)
return;
/* first major is 1, so we get >= 0x200 here */
- DEBUG_ENT("disk event %d:%d\n", disk->major, disk->first_minor);
+ DEBUG_ENT("disk event %d:%d\n",
+ MAJOR(disk_devt(disk)), MINOR(disk_devt(disk)));
- add_timer_randomness(disk->random,
- 0x100 + MKDEV(disk->major, disk->first_minor));
+ add_timer_randomness(disk->random, 0x100 + disk_devt(disk));
}
#endif
if (write) {
/* disk has become write protected */
- if (cd->disk->policy) {
+ if (get_disk_ro(cd->disk)) {
cdrom_end_request(drive, 0);
return ide_stopped;
}
#include <asm/io.h>
#include <asm/div64.h>
+#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
+#define IDE_DISK_MINORS (1 << PARTN_BITS)
+#else
+#define IDE_DISK_MINORS 0
+#endif
+
struct ide_disk_obj {
ide_drive_t *drive;
ide_driver_t *driver;
if (!idkp)
goto failed;
- g = alloc_disk_node(1 << PARTN_BITS,
- hwif_to_node(drive->hwif));
+ g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
if (!g)
goto out_free_idkp;
} else
drive->attach = 1;
- g->minors = 1 << PARTN_BITS;
+ g->minors = IDE_DISK_MINORS;
g->driverfs_dev = &drive->gendev;
- g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
+ g->flags |= GENHD_FL_EXT_DEVT;
+ if (drive->removable)
+ g->flags |= GENHD_FL_REMOVABLE;
set_capacity(g, idedisk_capacity(drive));
g->fops = &idedisk_ops;
add_disk(g);
{
struct gendisk *p = data;
*part &= (1 << PARTN_BITS) - 1;
- return &p->dev.kobj;
+ return &disk_to_dev(p)->kobj;
}
static int exact_lock(dev_t dev, void *data)
old_nl->next = (uint32_t) ((void *) nl -
(void *) old_nl);
disk = dm_disk(hc->md);
- nl->dev = huge_encode_dev(MKDEV(disk->major, disk->first_minor));
+ nl->dev = huge_encode_dev(disk_devt(disk));
nl->next = 0;
strcpy(nl->name, hc->name);
if (dm_suspended(md))
param->flags |= DM_SUSPEND_FLAG;
- param->dev = huge_encode_dev(MKDEV(disk->major, disk->first_minor));
+ param->dev = huge_encode_dev(disk_devt(disk));
/*
* Yes, this will be out of date by the time it gets back
*/
param->open_count = dm_open_count(md);
- if (disk->policy)
+ if (get_disk_ro(disk))
param->flags |= DM_READONLY_FLAG;
param->event_nr = dm_get_event_nr(md);
unsigned fail_count; /* Cumulative failure count */
struct dm_path path;
+ struct work_struct deactivate_path;
};
#define path_to_pgpath(__pgp) container_of((__pgp), struct pgpath, path)
static void process_queued_ios(struct work_struct *work);
static void trigger_event(struct work_struct *work);
static void activate_path(struct work_struct *work);
+static void deactivate_path(struct work_struct *work);
/*-----------------------------------------------
{
struct pgpath *pgpath = kzalloc(sizeof(*pgpath), GFP_KERNEL);
- if (pgpath)
+ if (pgpath) {
pgpath->path.is_active = 1;
+ INIT_WORK(&pgpath->deactivate_path, deactivate_path);
+ }
return pgpath;
}
kfree(pgpath);
}
+static void deactivate_path(struct work_struct *work)
+{
+ struct pgpath *pgpath =
+ container_of(work, struct pgpath, deactivate_path);
+
+ blk_abort_queue(pgpath->path.dev->bdev->bd_disk->queue);
+}
+
static struct priority_group *alloc_priority_group(void)
{
struct priority_group *pg;
pgpath->path.dev->name, m->nr_valid_paths);
queue_work(kmultipathd, &m->trigger_event);
+ queue_work(kmultipathd, &pgpath->deactivate_path);
out:
spin_unlock_irqrestore(&m->lock, flags);
memset(major_minor, 0, sizeof(major_minor));
sprintf(major_minor, "%d:%d",
- bio->bi_bdev->bd_disk->major,
- bio->bi_bdev->bd_disk->first_minor);
+ MAJOR(disk_devt(bio->bi_bdev->bd_disk)),
+ MINOR(disk_devt(bio->bi_bdev->bd_disk)));
/*
* Test to see which stripe drive triggered the event
static void start_io_acct(struct dm_io *io)
{
struct mapped_device *md = io->md;
+ int cpu;
io->start_time = jiffies;
- preempt_disable();
- disk_round_stats(dm_disk(md));
- preempt_enable();
- dm_disk(md)->in_flight = atomic_inc_return(&md->pending);
+ cpu = part_stat_lock();
+ part_round_stats(cpu, &dm_disk(md)->part0);
+ part_stat_unlock();
+ dm_disk(md)->part0.in_flight = atomic_inc_return(&md->pending);
}
static int end_io_acct(struct dm_io *io)
struct mapped_device *md = io->md;
struct bio *bio = io->bio;
unsigned long duration = jiffies - io->start_time;
- int pending;
+ int pending, cpu;
int rw = bio_data_dir(bio);
- preempt_disable();
- disk_round_stats(dm_disk(md));
- preempt_enable();
- dm_disk(md)->in_flight = pending = atomic_dec_return(&md->pending);
+ cpu = part_stat_lock();
+ part_round_stats(cpu, &dm_disk(md)->part0);
+ part_stat_add(cpu, &dm_disk(md)->part0, ticks[rw], duration);
+ part_stat_unlock();
- disk_stat_add(dm_disk(md), ticks[rw], duration);
+ dm_disk(md)->part0.in_flight = pending =
+ atomic_dec_return(&md->pending);
return !pending;
}
int r = -EIO;
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
+ int cpu;
/*
* There is no use in forwarding any barrier request since we can't
down_read(&md->io_lock);
- disk_stat_inc(dm_disk(md), ios[rw]);
- disk_stat_add(dm_disk(md), sectors[rw], bio_sectors(bio));
+ cpu = part_stat_lock();
+ part_stat_inc(cpu, &dm_disk(md)->part0, ios[rw]);
+ part_stat_add(cpu, &dm_disk(md)->part0, sectors[rw], bio_sectors(bio));
+ part_stat_unlock();
/*
* If we're suspended we have to queue
static void free_dev(struct mapped_device *md)
{
- int minor = md->disk->first_minor;
+ int minor = MINOR(disk_devt(md->disk));
if (md->suspended_bdev) {
unlock_fs(md);
list_splice_init(&md->uevent_list, &uevents);
spin_unlock_irqrestore(&md->uevent_lock, flags);
- dm_send_uevents(&uevents, &md->disk->dev.kobj);
+ dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj);
atomic_inc(&md->event_nr);
wake_up(&md->eventq);
md = idr_find(&_minor_idr, minor);
if (md && (md == MINOR_ALLOCED ||
- (dm_disk(md)->first_minor != minor) ||
+ (MINOR(disk_devt(dm_disk(md))) != minor) ||
test_bit(DMF_FREEING, &md->flags))) {
md = NULL;
goto out;
if (atomic_dec_and_lock(&md->holders, &_minor_lock)) {
map = dm_get_table(md);
- idr_replace(&_minor_idr, MINOR_ALLOCED, dm_disk(md)->first_minor);
+ idr_replace(&_minor_idr, MINOR_ALLOCED,
+ MINOR(disk_devt(dm_disk(md))));
set_bit(DMF_FREEING, &md->flags);
spin_unlock(&_minor_lock);
if (!dm_suspended(md)) {
*---------------------------------------------------------------*/
void dm_kobject_uevent(struct mapped_device *md)
{
- kobject_uevent(&md->disk->dev.kobj, KOBJ_CHANGE);
+ kobject_uevent(&disk_to_dev(md->disk)->kobj, KOBJ_CHANGE);
}
uint32_t dm_next_uevent_seq(struct mapped_device *md)
mddev_t *mddev = q->queuedata;
dev_info_t *tmp_dev;
sector_t block;
+ int cpu;
if (unlikely(bio_barrier(bio))) {
bio_endio(bio, -EOPNOTSUPP);
return 0;
}
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ cpu = part_stat_lock();
+ part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
+ part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
+ bio_sectors(bio));
+ part_stat_unlock();
tmp_dev = which_dev(mddev, bio->bi_sector);
block = bio->bi_sector >> 1;
* split it.
*/
struct bio_pair *bp;
- bp = bio_split(bio, bio_split_pool,
+ bp = bio_split(bio,
((tmp_dev->offset + tmp_dev->size)<<1) - bio->bi_sector);
if (linear_make_request(q, &bp->bio1))
generic_make_request(&bp->bio1);
if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
goto fail;
- if (rdev->bdev->bd_part)
- ko = &rdev->bdev->bd_part->dev.kobj;
- else
- ko = &rdev->bdev->bd_disk->dev.kobj;
+ ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
kobject_del(&rdev->kobj);
goto fail;
disk->queue = mddev->queue;
add_disk(disk);
mddev->gendisk = disk;
- error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
- "%s", "md");
+ error = kobject_init_and_add(&mddev->kobj, &md_ktype,
+ &disk_to_dev(disk)->kobj, "%s", "md");
mutex_unlock(&disks_mutex);
if (error)
printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
sysfs_notify(&mddev->kobj, NULL, "array_state");
sysfs_notify(&mddev->kobj, NULL, "sync_action");
sysfs_notify(&mddev->kobj, NULL, "degraded");
- kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
+ kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
return 0;
}
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev) {
struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
- curr_events = disk_stat_read(disk, sectors[0]) +
- disk_stat_read(disk, sectors[1]) -
+ curr_events = part_stat_read(&disk->part0, sectors[0]) +
+ part_stat_read(&disk->part0, sectors[1]) -
atomic_read(&disk->sync_io);
/* sync IO will cause sync_io to increase before the disk_stats
* as sync_io is counted when a request starts, and
struct multipath_bh * mp_bh;
struct multipath_info *multipath;
const int rw = bio_data_dir(bio);
+ int cpu;
if (unlikely(bio_barrier(bio))) {
bio_endio(bio, -EOPNOTSUPP);
mp_bh->master_bio = bio;
mp_bh->mddev = mddev;
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ cpu = part_stat_lock();
+ part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
+ part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
+ bio_sectors(bio));
+ part_stat_unlock();
mp_bh->path = multipath_map(conf);
if (mp_bh->path < 0) {
sector_t chunk;
sector_t block, rsect;
const int rw = bio_data_dir(bio);
+ int cpu;
if (unlikely(bio_barrier(bio))) {
bio_endio(bio, -EOPNOTSUPP);
return 0;
}
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ cpu = part_stat_lock();
+ part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
+ part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
+ bio_sectors(bio));
+ part_stat_unlock();
chunk_size = mddev->chunk_size >> 10;
chunk_sects = mddev->chunk_size >> 9;
/* This is a one page bio that upper layers
* refuse to split for us, so we need to split it.
*/
- bp = bio_split(bio, bio_split_pool, chunk_sects - (bio->bi_sector & (chunk_sects - 1)) );
+ bp = bio_split(bio, chunk_sects - (bio->bi_sector & (chunk_sects - 1)));
if (raid0_make_request(q, &bp->bio1))
generic_make_request(&bp->bio1);
if (raid0_make_request(q, &bp->bio2))
struct page **behind_pages = NULL;
const int rw = bio_data_dir(bio);
const int do_sync = bio_sync(bio);
- int do_barriers;
+ int cpu, do_barriers;
mdk_rdev_t *blocked_rdev;
/*
bitmap = mddev->bitmap;
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ cpu = part_stat_lock();
+ part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
+ part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
+ bio_sectors(bio));
+ part_stat_unlock();
/*
* make_request() can abort the operation when READA is being
sbio->bi_size = r1_bio->sectors << 9;
sbio->bi_idx = 0;
sbio->bi_phys_segments = 0;
- sbio->bi_hw_segments = 0;
- sbio->bi_hw_front_size = 0;
- sbio->bi_hw_back_size = 0;
sbio->bi_flags &= ~(BIO_POOL_MASK - 1);
sbio->bi_flags |= 1 << BIO_UPTODATE;
sbio->bi_next = NULL;
bio->bi_vcnt = 0;
bio->bi_idx = 0;
bio->bi_phys_segments = 0;
- bio->bi_hw_segments = 0;
bio->bi_size = 0;
bio->bi_end_io = NULL;
bio->bi_private = NULL;
mirror_info_t *mirror;
r10bio_t *r10_bio;
struct bio *read_bio;
+ int cpu;
int i;
int chunk_sects = conf->chunk_mask + 1;
const int rw = bio_data_dir(bio);
/* This is a one page bio that upper layers
* refuse to split for us, so we need to split it.
*/
- bp = bio_split(bio, bio_split_pool,
+ bp = bio_split(bio,
chunk_sects - (bio->bi_sector & (chunk_sects - 1)) );
if (make_request(q, &bp->bio1))
generic_make_request(&bp->bio1);
*/
wait_barrier(conf);
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ cpu = part_stat_lock();
+ part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
+ part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
+ bio_sectors(bio));
+ part_stat_unlock();
r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
tbio->bi_size = r10_bio->sectors << 9;
tbio->bi_idx = 0;
tbio->bi_phys_segments = 0;
- tbio->bi_hw_segments = 0;
- tbio->bi_hw_front_size = 0;
- tbio->bi_hw_back_size = 0;
tbio->bi_flags &= ~(BIO_POOL_MASK - 1);
tbio->bi_flags |= 1 << BIO_UPTODATE;
tbio->bi_next = NULL;
bio->bi_vcnt = 0;
bio->bi_idx = 0;
bio->bi_phys_segments = 0;
- bio->bi_hw_segments = 0;
bio->bi_size = 0;
}
const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256)));
#endif
+/*
+ * We maintain a biased count of active stripes in the bottom 16 bits of
+ * bi_phys_segments, and a count of processed stripes in the upper 16 bits
+ */
+static inline int raid5_bi_phys_segments(struct bio *bio)
+{
+ return bio->bi_phys_segments & 0xffff;
+}
+
+static inline int raid5_bi_hw_segments(struct bio *bio)
+{
+ return (bio->bi_phys_segments >> 16) & 0xffff;
+}
+
+static inline int raid5_dec_bi_phys_segments(struct bio *bio)
+{
+ --bio->bi_phys_segments;
+ return raid5_bi_phys_segments(bio);
+}
+
+static inline int raid5_dec_bi_hw_segments(struct bio *bio)
+{
+ unsigned short val = raid5_bi_hw_segments(bio);
+
+ --val;
+ bio->bi_phys_segments = (val << 16) | raid5_bi_phys_segments(bio);
+ return val;
+}
+
+static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt)
+{
+ bio->bi_phys_segments = raid5_bi_phys_segments(bio) || (cnt << 16);
+}
+
static inline int raid6_next_disk(int disk, int raid_disks)
{
disk++;
while (rbi && rbi->bi_sector <
dev->sector + STRIPE_SECTORS) {
rbi2 = r5_next_bio(rbi, dev->sector);
- if (--rbi->bi_phys_segments == 0) {
+ if (!raid5_dec_bi_phys_segments(rbi)) {
rbi->bi_next = return_bi;
return_bi = rbi;
}
if (*bip)
bi->bi_next = *bip;
*bip = bi;
- bi->bi_phys_segments ++;
+ bi->bi_phys_segments++;
spin_unlock_irq(&conf->device_lock);
spin_unlock(&sh->lock);
sh->dev[i].sector + STRIPE_SECTORS) {
struct bio *nextbi = r5_next_bio(bi, sh->dev[i].sector);
clear_bit(BIO_UPTODATE, &bi->bi_flags);
- if (--bi->bi_phys_segments == 0) {
+ if (!raid5_dec_bi_phys_segments(bi)) {
md_write_end(conf->mddev);
bi->bi_next = *return_bi;
*return_bi = bi;
sh->dev[i].sector + STRIPE_SECTORS) {
struct bio *bi2 = r5_next_bio(bi, sh->dev[i].sector);
clear_bit(BIO_UPTODATE, &bi->bi_flags);
- if (--bi->bi_phys_segments == 0) {
+ if (!raid5_dec_bi_phys_segments(bi)) {
md_write_end(conf->mddev);
bi->bi_next = *return_bi;
*return_bi = bi;
struct bio *nextbi =
r5_next_bio(bi, sh->dev[i].sector);
clear_bit(BIO_UPTODATE, &bi->bi_flags);
- if (--bi->bi_phys_segments == 0) {
+ if (!raid5_dec_bi_phys_segments(bi)) {
bi->bi_next = *return_bi;
*return_bi = bi;
}
while (wbi && wbi->bi_sector <
dev->sector + STRIPE_SECTORS) {
wbi2 = r5_next_bio(wbi, dev->sector);
- if (--wbi->bi_phys_segments == 0) {
+ if (!raid5_dec_bi_phys_segments(wbi)) {
md_write_end(conf->mddev);
wbi->bi_next = *return_bi;
*return_bi = wbi;
copy_data(0, rbi, dev->page, dev->sector);
rbi2 = r5_next_bio(rbi, dev->sector);
spin_lock_irq(&conf->device_lock);
- if (--rbi->bi_phys_segments == 0) {
+ if (!raid5_dec_bi_phys_segments(rbi)) {
rbi->bi_next = return_bi;
return_bi = rbi;
}
if(bi) {
conf->retry_read_aligned_list = bi->bi_next;
bi->bi_next = NULL;
+ /*
+ * this sets the active strip count to 1 and the processed
+ * strip count to zero (upper 8 bits)
+ */
bi->bi_phys_segments = 1; /* biased count of active stripes */
- bi->bi_hw_segments = 0; /* count of processed stripes */
}
return bi;
if ((bi->bi_size>>9) > q->max_sectors)
return 0;
blk_recount_segments(q, bi);
- if (bi->bi_phys_segments > q->max_phys_segments ||
- bi->bi_hw_segments > q->max_hw_segments)
+ if (bi->bi_phys_segments > q->max_phys_segments)
return 0;
if (q->merge_bvec_fn)
sector_t logical_sector, last_sector;
struct stripe_head *sh;
const int rw = bio_data_dir(bi);
- int remaining;
+ int cpu, remaining;
if (unlikely(bio_barrier(bi))) {
bio_endio(bi, -EOPNOTSUPP);
md_write_start(mddev, bi);
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi));
+ cpu = part_stat_lock();
+ part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
+ part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
+ bio_sectors(bi));
+ part_stat_unlock();
if (rw == READ &&
mddev->reshape_position == MaxSector &&
}
spin_lock_irq(&conf->device_lock);
- remaining = --bi->bi_phys_segments;
+ remaining = raid5_dec_bi_phys_segments(bi);
spin_unlock_irq(&conf->device_lock);
if (remaining == 0) {
sector += STRIPE_SECTORS,
scnt++) {
- if (scnt < raid_bio->bi_hw_segments)
+ if (scnt < raid5_bi_hw_segments(raid_bio))
/* already done this stripe */
continue;
if (!sh) {
/* failed to get a stripe - must wait */
- raid_bio->bi_hw_segments = scnt;
+ raid5_set_bi_hw_segments(raid_bio, scnt);
conf->retry_read_aligned = raid_bio;
return handled;
}
set_bit(R5_ReadError, &sh->dev[dd_idx].flags);
if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) {
release_stripe(sh);
- raid_bio->bi_hw_segments = scnt;
+ raid5_set_bi_hw_segments(raid_bio, scnt);
conf->retry_read_aligned = raid_bio;
return handled;
}
handled++;
}
spin_lock_irq(&conf->device_lock);
- remaining = --raid_bio->bi_phys_segments;
+ remaining = raid5_dec_bi_phys_segments(raid_bio);
spin_unlock_irq(&conf->device_lock);
if (remaining == 0)
bio_endio(raid_bio, 0);
static int mspro_block_disk_release(struct gendisk *disk)
{
struct mspro_block_data *msb = disk->private_data;
- int disk_id = disk->first_minor >> MSPRO_BLOCK_PART_SHIFT;
+ int disk_id = MINOR(disk_devt(disk)) >> MSPRO_BLOCK_PART_SHIFT;
mutex_lock(&mspro_block_disk_lock);
if (msb->eject) {
while ((req = elv_next_request(q)) != NULL)
- end_queued_request(req, -ENODEV);
+ __blk_end_request(req, -ENODEV, blk_rq_bytes(req));
return;
}
mutex_lock(&open_lock);
md->usage--;
if (md->usage == 0) {
- int devidx = md->disk->first_minor >> MMC_SHIFT;
+ int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT;
__clear_bit(devidx, dev_use);
put_disk(md->disk);
return ftl_write((void *)dev, buf, block, 1);
}
+static int ftl_discardsect(struct mtd_blktrans_dev *dev,
+ unsigned long sector, unsigned nr_sects)
+{
+ partition_t *part = (void *)dev;
+ uint32_t bsize = 1 << part->header.EraseUnitSize;
+
+ DEBUG(1, "FTL erase sector %ld for %d sectors\n",
+ sector, nr_sects);
+
+ while (nr_sects) {
+ uint32_t old_addr = part->VirtualBlockMap[sector];
+ if (old_addr != 0xffffffff) {
+ part->VirtualBlockMap[sector] = 0xffffffff;
+ part->EUNInfo[old_addr/bsize].Deleted++;
+ if (set_bam_entry(part, old_addr, 0))
+ return -EIO;
+ }
+ nr_sects--;
+ sector++;
+ }
+
+ return 0;
+}
/*====================================================================*/
static void ftl_freepart(partition_t *part)
.blksize = SECTOR_SIZE,
.readsect = ftl_readsect,
.writesect = ftl_writesect,
+ .discard = ftl_discardsect,
.getgeo = ftl_getgeo,
.add_mtd = ftl_add_mtd,
.remove_dev = ftl_remove_dev,
spinlock_t queue_lock;
};
+static int blktrans_discard_request(struct request_queue *q,
+ struct request *req)
+{
+ req->cmd_type = REQ_TYPE_LINUX_BLOCK;
+ req->cmd[0] = REQ_LB_OP_DISCARD;
+ return 0;
+}
+
static int do_blktrans_request(struct mtd_blktrans_ops *tr,
struct mtd_blktrans_dev *dev,
struct request *req)
buf = req->buffer;
+ if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
+ req->cmd[0] == REQ_LB_OP_DISCARD)
+ return !tr->discard(dev, block, nsect);
+
if (!blk_fs_request(req))
return 0;
tr->blkcore_priv->rq->queuedata = tr;
blk_queue_hardsect_size(tr->blkcore_priv->rq, tr->blksize);
+ if (tr->discard)
+ blk_queue_set_discard(tr->blkcore_priv->rq,
+ blktrans_discard_request);
+
tr->blkshift = ffs(tr->blksize) - 1;
tr->blkcore_priv->thread = kthread_run(mtd_blktrans_thread, tr,
/* Print kdev. */
if (block->gdp)
seq_printf(m, " at (%3d:%6d)",
- block->gdp->major, block->gdp->first_minor);
+ MAJOR(disk_devt(block->gdp)),
+ MINOR(disk_devt(block->gdp)));
else
seq_printf(m, " at (???:??????)");
/* Print device name. */
found = 0;
// test if minor available
list_for_each_entry(entry, &dcssblk_devices, lh)
- if (minor == entry->gd->first_minor)
+ if (minor == MINOR(disk_devt(entry->gd)))
found++;
if (!found) break; // got unused minor
}
goto unload_seg;
}
sprintf(dev_info->gd->disk_name, "dcssblk%d",
- dev_info->gd->first_minor);
+ MINOR(disk_devt(dev_info->gd)));
list_add_tail(&dev_info->lh, &dcssblk_devices);
if (!try_module_get(THIS_MODULE)) {
srbcmd->id = cpu_to_le32(scmd_id(cmd));
srbcmd->lun = cpu_to_le32(cmd->device->lun);
srbcmd->flags = cpu_to_le32(flag);
- timeout = cmd->timeout_per_command/HZ;
+ timeout = cmd->request->timeout/HZ;
if (timeout == 0)
timeout = 1;
srbcmd->timeout = cpu_to_le32(timeout); // timeout in seconds
/* use request field to save the ptr. to completion struct. */
scp->request = (struct request *)&wait;
- scp->timeout_per_command = timeout*HZ;
scp->cmd_len = 12;
scp->cmnd = cmnd;
cmndinfo.priority = IOCTL_PRI;
register Scsi_Cmnd *pscp;
register Scsi_Cmnd *nscp;
ulong flags;
- unchar b, t;
TRACE(("gdth_putq() priority %d\n",priority));
spin_lock_irqsave(&ha->smp_lock, flags);
- if (!cmndinfo->internal_command) {
+ if (!cmndinfo->internal_command)
cmndinfo->priority = priority;
- b = scp->device->channel;
- t = scp->device->id;
- if (priority >= DEFAULT_PRI) {
- if ((b != ha->virt_bus && ha->raw[BUS_L2P(ha,b)].lock) ||
- (b==ha->virt_bus && t<MAX_HDRIVES && ha->hdr[t].lock)) {
- TRACE2(("gdth_putq(): locked IO ->update_timeout()\n"));
- cmndinfo->timeout = gdth_update_timeout(scp, 0);
- }
- }
- }
if (ha->req_first==NULL) {
ha->req_first = scp; /* queue was empty */
return ((const char *)ha->binfo.type_string);
}
+static enum blk_eh_timer_return gdth_timed_out(struct scsi_cmnd *scp)
+{
+ gdth_ha_str *ha = shost_priv(scp->device->host);
+ struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp);
+ unchar b, t;
+ ulong flags;
+ enum blk_eh_timer_return retval = BLK_EH_NOT_HANDLED;
+
+ TRACE(("%s() cmd 0x%x\n", scp->cmnd[0], __func__));
+ b = scp->device->channel;
+ t = scp->device->id;
+
+ /*
+ * We don't really honor the command timeout, but we try to
+ * honor 6 times of the actual command timeout! So reset the
+ * timer if this is less than 6th timeout on this command!
+ */
+ if (++cmndinfo->timeout_count < 6)
+ retval = BLK_EH_RESET_TIMER;
+
+ /* Reset the timeout if it is locked IO */
+ spin_lock_irqsave(&ha->smp_lock, flags);
+ if ((b != ha->virt_bus && ha->raw[BUS_L2P(ha, b)].lock) ||
+ (b == ha->virt_bus && t < MAX_HDRIVES && ha->hdr[t].lock)) {
+ TRACE2(("%s(): locked IO, reset timeout\n", __func__));
+ retval = BLK_EH_RESET_TIMER;
+ }
+ spin_unlock_irqrestore(&ha->smp_lock, flags);
+
+ return retval;
+}
+
+
static int gdth_eh_bus_reset(Scsi_Cmnd *scp)
{
gdth_ha_str *ha = shost_priv(scp->device->host);
BUG_ON(!cmndinfo);
scp->scsi_done = done;
- gdth_update_timeout(scp, scp->timeout_per_command * 6);
+ cmndinfo->timeout_count = 0;
cmndinfo->priority = DEFAULT_PRI;
return __gdth_queuecommand(ha, scp, cmndinfo);
ha->hdr[j].lock = 1;
spin_unlock_irqrestore(&ha->smp_lock, flags);
gdth_wait_completion(ha, ha->bus_cnt, j);
- gdth_stop_timeout(ha, ha->bus_cnt, j);
} else {
spin_lock_irqsave(&ha->smp_lock, flags);
ha->hdr[j].lock = 0;
spin_unlock_irqrestore(&ha->smp_lock, flags);
- gdth_start_timeout(ha, ha->bus_cnt, j);
gdth_next(ha);
}
}
spin_lock_irqsave(&ha->smp_lock, flags);
ha->raw[i].lock = 1;
spin_unlock_irqrestore(&ha->smp_lock, flags);
- for (j = 0; j < ha->tid_cnt; ++j) {
+ for (j = 0; j < ha->tid_cnt; ++j)
gdth_wait_completion(ha, i, j);
- gdth_stop_timeout(ha, i, j);
- }
} else {
spin_lock_irqsave(&ha->smp_lock, flags);
ha->raw[i].lock = 0;
spin_unlock_irqrestore(&ha->smp_lock, flags);
- for (j = 0; j < ha->tid_cnt; ++j) {
- gdth_start_timeout(ha, i, j);
+ for (j = 0; j < ha->tid_cnt; ++j)
gdth_next(ha);
- }
}
}
break;
.slave_configure = gdth_slave_configure,
.bios_param = gdth_bios_param,
.proc_info = gdth_proc_info,
+ .eh_timed_out = gdth_timed_out,
.proc_name = "gdth",
.can_queue = GDTH_MAXCMDS,
.this_id = -1,
gdth_cmd_str *internal_cmd_str; /* crier for internal messages*/
dma_addr_t sense_paddr; /* sense dma-addr */
unchar priority;
- int timeout;
+ int timeout_count; /* # of timeout calls */
volatile int wait_for_completion;
ushort status;
ulong32 info;
}
spin_unlock_irqrestore(&ha->smp_lock, flags);
}
-
-static void gdth_stop_timeout(gdth_ha_str *ha, int busnum, int id)
-{
- ulong flags;
- Scsi_Cmnd *scp;
- unchar b, t;
-
- spin_lock_irqsave(&ha->smp_lock, flags);
-
- for (scp = ha->req_first; scp; scp = (Scsi_Cmnd *)scp->SCp.ptr) {
- struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp);
- if (!cmndinfo->internal_command) {
- b = scp->device->channel;
- t = scp->device->id;
- if (t == (unchar)id && b == (unchar)busnum) {
- TRACE2(("gdth_stop_timeout(): update_timeout()\n"));
- cmndinfo->timeout = gdth_update_timeout(scp, 0);
- }
- }
- }
- spin_unlock_irqrestore(&ha->smp_lock, flags);
-}
-
-static void gdth_start_timeout(gdth_ha_str *ha, int busnum, int id)
-{
- ulong flags;
- Scsi_Cmnd *scp;
- unchar b, t;
-
- spin_lock_irqsave(&ha->smp_lock, flags);
-
- for (scp = ha->req_first; scp; scp = (Scsi_Cmnd *)scp->SCp.ptr) {
- struct gdth_cmndinfo *cmndinfo = gdth_cmnd_priv(scp);
- if (!cmndinfo->internal_command) {
- b = scp->device->channel;
- t = scp->device->id;
- if (t == (unchar)id && b == (unchar)busnum) {
- TRACE2(("gdth_start_timeout(): update_timeout()\n"));
- gdth_update_timeout(scp, cmndinfo->timeout);
- }
- }
- }
- spin_unlock_irqrestore(&ha->smp_lock, flags);
-}
-
-static int gdth_update_timeout(Scsi_Cmnd *scp, int timeout)
-{
- int oldto;
-
- oldto = scp->timeout_per_command;
- scp->timeout_per_command = timeout;
-
- if (timeout == 0) {
- del_timer(&scp->eh_timeout);
- scp->eh_timeout.data = (unsigned long) NULL;
- scp->eh_timeout.expires = 0;
- } else {
- if (scp->eh_timeout.data != (unsigned long) NULL)
- del_timer(&scp->eh_timeout);
- scp->eh_timeout.data = (unsigned long) scp;
- scp->eh_timeout.expires = jiffies + timeout;
- add_timer(&scp->eh_timeout);
- }
-
- return oldto;
-}
ulong64 *paddr);
static void gdth_ioctl_free(gdth_ha_str *ha, int size, char *buf, ulong64 paddr);
static void gdth_wait_completion(gdth_ha_str *ha, int busnum, int id);
-static void gdth_stop_timeout(gdth_ha_str *ha, int busnum, int id);
-static void gdth_start_timeout(gdth_ha_str *ha, int busnum, int id);
-static int gdth_update_timeout(Scsi_Cmnd *scp, int timeout);
#endif
init_event_struct(evt_struct,
handle_cmd_rsp,
VIOSRP_SRP_FORMAT,
- cmnd->timeout_per_command/HZ);
+ cmnd->request->timeout/HZ);
evt_struct->cmnd = cmnd;
evt_struct->cmnd_done = done;
pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
pc->scsi_cmd = cmd;
pc->done = done;
- pc->timeout = jiffies + cmd->timeout_per_command;
+ pc->timeout = jiffies + cmd->request->timeout;
if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
sdev->no_uld_attach = 1;
}
if (ipr_is_vset_device(res)) {
- sdev->timeout = IPR_VSET_RW_TIMEOUT;
+ blk_queue_rq_timeout(sdev->request_queue,
+ IPR_VSET_RW_TIMEOUT);
blk_queue_max_sectors(sdev->request_queue, IPR_VSET_MAX_SECTORS);
}
if (ipr_is_vset_device(res) || ipr_is_scsi_disk(res))
scb->cmd.dcdb.segment_4G = 0;
scb->cmd.dcdb.enhanced_sg = 0;
- TimeOut = scb->scsi_cmd->timeout_per_command;
+ TimeOut = scb->scsi_cmd->request->timeout;
if (ha->subsys->param[4] & 0x00100000) { /* If NEW Tape DCDB is Supported */
if (!scb->sg_len) {
scsi_queue_work(conn->session->host, &conn->xmitwork);
}
-static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
+static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
{
struct iscsi_cls_session *cls_session;
struct iscsi_session *session;
struct iscsi_conn *conn;
- enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
+ enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
cls_session = starget_to_session(scsi_target(scmd->device));
session = cls_session->dd_data;
* We are probably in the middle of iscsi recovery so let
* that complete and handle the error.
*/
- rc = EH_RESET_TIMER;
+ rc = BLK_EH_RESET_TIMER;
goto done;
}
conn = session->leadconn;
if (!conn) {
/* In the middle of shuting down */
- rc = EH_RESET_TIMER;
+ rc = BLK_EH_RESET_TIMER;
goto done;
}
*/
if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
(conn->ping_timeout * HZ), jiffies))
- rc = EH_RESET_TIMER;
+ rc = BLK_EH_RESET_TIMER;
/*
* if we are about to check the transport then give the command
* more time
*/
if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
jiffies))
- rc = EH_RESET_TIMER;
+ rc = BLK_EH_RESET_TIMER;
/* if in the middle of checking the transport then give us more time */
if (conn->ping_task)
- rc = EH_RESET_TIMER;
+ rc = BLK_EH_RESET_TIMER;
done:
spin_unlock(&session->lock);
- debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
+ debug_scsi("return %s\n", rc == BLK_EH_RESET_TIMER ?
+ "timer reset" : "nh");
return rc;
}
/* Bounce SCSI-initiated commands to the SCSI EH */
if (qc->scsicmd) {
- scsi_req_abort_cmd(qc->scsicmd);
+ blk_abort_request(qc->scsicmd->request);
scsi_schedule_eh(qc->scsicmd->device->host);
return;
}
int sas_register_ports(struct sas_ha_struct *sas_ha);
void sas_unregister_ports(struct sas_ha_struct *sas_ha);
-enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *);
+enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *);
int sas_init_queue(struct sas_ha_struct *sas_ha);
int sas_init_events(struct sas_ha_struct *sas_ha);
return;
}
-enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
+enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
{
struct sas_task *task = TO_SAS_TASK(cmd);
unsigned long flags;
if (!task) {
- cmd->timeout_per_command /= 2;
+ cmd->request->timeout /= 2;
SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
- cmd, task, (cmd->timeout_per_command ?
- "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
- if (!cmd->timeout_per_command)
- return EH_NOT_HANDLED;
- return EH_RESET_TIMER;
+ cmd, task, (cmd->request->timeout ?
+ "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
+ if (!cmd->request->timeout)
+ return BLK_EH_NOT_HANDLED;
+ return BLK_EH_RESET_TIMER;
}
spin_lock_irqsave(&task->task_state_lock, flags);
BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
if (task->task_state_flags & SAS_TASK_STATE_DONE) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
- SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
- cmd, task);
- return EH_HANDLED;
+ SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
+ "BLK_EH_HANDLED\n", cmd, task);
+ return BLK_EH_HANDLED;
}
if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
- "EH_RESET_TIMER\n",
+ "BLK_EH_RESET_TIMER\n",
cmd, task);
- return EH_RESET_TIMER;
+ return BLK_EH_RESET_TIMER;
}
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
spin_unlock_irqrestore(&task->task_state_lock, flags);
- SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
+ SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
cmd, task);
- return EH_NOT_HANDLED;
+ return BLK_EH_NOT_HANDLED;
}
int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
return;
}
- scsi_req_abort_cmd(sc);
+ blk_abort_request(sc->request);
scsi_schedule_eh(sc->device->host);
}
* cmd has not been completed within the timeout period.
*/
static enum
-scsi_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
+blk_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
{
struct megasas_cmd *cmd = (struct megasas_cmd *)scmd->SCp.ptr;
struct megasas_instance *instance;
if (time_after(jiffies, scmd->jiffies_at_alloc +
(MEGASAS_DEFAULT_CMD_TIMEOUT * 2) * HZ)) {
- return EH_NOT_HANDLED;
+ return BLK_EH_NOT_HANDLED;
}
instance = cmd->instance;
spin_unlock_irqrestore(instance->host->host_lock, flags);
}
- return EH_RESET_TIMER;
+ return BLK_EH_RESET_TIMER;
}
/**
**
**----------------------------------------------------
*/
- if (np->settle_time && cmd->timeout_per_command >= HZ) {
- u_long tlimit = jiffies + cmd->timeout_per_command - HZ;
+ if (np->settle_time && cmd->request->timeout >= HZ) {
+ u_long tlimit = jiffies + cmd->request->timeout - HZ;
if (time_after(np->settle_time, tlimit))
np->settle_time = tlimit;
}
memset(((char *)pkt + 8), 0, (REQUEST_ENTRY_SIZE - 8));
/* Set ISP command timeout. */
- pkt->timeout = cpu_to_le16(cmd->timeout_per_command/HZ);
+ pkt->timeout = cpu_to_le16(cmd->request->timeout/HZ);
/* Set device target ID and LUN */
pkt->lun = SCSI_LUN_32(cmd);
memset(((char *)pkt + 8), 0, (REQUEST_ENTRY_SIZE - 8));
/* Set ISP command timeout. */
- pkt->timeout = cpu_to_le16(cmd->timeout_per_command/HZ);
+ pkt->timeout = cpu_to_le16(cmd->request->timeout/HZ);
/* Set device target ID and LUN */
pkt->lun = SCSI_LUN_32(cmd);
DEBUG2(printk(KERN_INFO
"scsi%ld: DEVICE_RESET cmd=%p jiffies = 0x%lx, to=%x,"
"dpc_flags=%lx, status=%x allowed=%d\n", ha->host_no,
- cmd, jiffies, cmd->timeout_per_command / HZ,
+ cmd, jiffies, cmd->request->timeout / HZ,
ha->dpc_flags, cmd->result, cmd->allowed));
/* FIXME: wait for hba to go online */
DEBUG2(printk(KERN_INFO
"scsi%ld: TARGET_DEVICE_RESET cmd=%p jiffies = 0x%lx, "
"to=%x,dpc_flags=%lx, status=%x allowed=%d\n",
- ha->host_no, cmd, jiffies, cmd->timeout_per_command / HZ,
+ ha->host_no, cmd, jiffies, cmd->request->timeout / HZ,
ha->dpc_flags, cmd->result, cmd->allowed));
stat = qla4xxx_reset_target(ha, ddb_entry);
unsigned long flags;
cmd->device = dev;
- init_timer(&cmd->eh_timeout);
INIT_LIST_HEAD(&cmd->list);
spin_lock_irqsave(&dev->list_lock, flags);
list_add_tail(&cmd->list, &dev->cmd_list);
unsigned long timeout;
int rtn = 0;
+ /*
+ * We will use a queued command if possible, otherwise we will
+ * emulate the queuing and calling of completion function ourselves.
+ */
+ atomic_inc(&cmd->device->iorequest_cnt);
+
/* check if the device is still usable */
if (unlikely(cmd->device->sdev_state == SDEV_DEL)) {
/* in SDEV_DEL we error all commands. DID_NO_CONNECT
* returns an immediate error upwards, and signals
* that the device is no longer present */
cmd->result = DID_NO_CONNECT << 16;
- atomic_inc(&cmd->device->iorequest_cnt);
- __scsi_done(cmd);
+ scsi_done(cmd);
/* return 0 (because the command has been processed) */
goto out;
}
* future requests should not occur until the device
* transitions out of the suspend state.
*/
+
scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY);
SCSI_LOG_MLQUEUE(3, printk("queuecommand : device blocked \n"));
host->resetting = 0;
}
- /*
- * AK: unlikely race here: for some reason the timer could
- * expire before the serial number is set up below.
- */
- scsi_add_timer(cmd, cmd->timeout_per_command, scsi_times_out);
-
scsi_log_send(cmd);
- /*
- * We will use a queued command if possible, otherwise we will
- * emulate the queuing and calling of completion function ourselves.
- */
- atomic_inc(&cmd->device->iorequest_cnt);
-
/*
* Before we queue this command, check if the command
* length exceeds what the host adapter can handle.
}
spin_lock_irqsave(host->host_lock, flags);
+ /*
+ * AK: unlikely race here: for some reason the timer could
+ * expire before the serial number is set up below.
+ *
+ * TODO: kill serial or move to blk layer
+ */
scsi_cmd_get_serial(host, cmd);
if (unlikely(host->shost_state == SHOST_DEL)) {
}
spin_unlock_irqrestore(host->host_lock, flags);
if (rtn) {
- if (scsi_delete_timer(cmd)) {
- atomic_inc(&cmd->device->iodone_cnt);
- scsi_queue_insert(cmd,
- (rtn == SCSI_MLQUEUE_DEVICE_BUSY) ?
- rtn : SCSI_MLQUEUE_HOST_BUSY);
- }
+ scsi_queue_insert(cmd, (rtn == SCSI_MLQUEUE_DEVICE_BUSY) ?
+ rtn : SCSI_MLQUEUE_HOST_BUSY);
SCSI_LOG_MLQUEUE(3,
printk("queuecommand : request rejected\n"));
}
return rtn;
}
-/**
- * scsi_req_abort_cmd -- Request command recovery for the specified command
- * @cmd: pointer to the SCSI command of interest
- *
- * This function requests that SCSI Core start recovery for the
- * command by deleting the timer and adding the command to the eh
- * queue. It can be called by either LLDDs or SCSI Core. LLDDs who
- * implement their own error recovery MAY ignore the timeout event if
- * they generated scsi_req_abort_cmd.
- */
-void scsi_req_abort_cmd(struct scsi_cmnd *cmd)
-{
- if (!scsi_delete_timer(cmd))
- return;
- scsi_times_out(cmd);
-}
-EXPORT_SYMBOL(scsi_req_abort_cmd);
-
/**
* scsi_done - Enqueue the finished SCSI command into the done queue.
* @cmd: The SCSI Command for which a low-level device driver (LLDD) gives
*/
static void scsi_done(struct scsi_cmnd *cmd)
{
- /*
- * We don't have to worry about this one timing out anymore.
- * If we are unable to remove the timer, then the command
- * has already timed out. In which case, we have no choice but to
- * let the timeout function run, as we have no idea where in fact
- * that function could really be. It might be on another processor,
- * etc, etc.
- */
- if (!scsi_delete_timer(cmd))
- return;
- __scsi_done(cmd);
-}
-
-/* Private entry to scsi_done() to complete a command when the timer
- * isn't running --- used by scsi_times_out */
-void __scsi_done(struct scsi_cmnd *cmd)
-{
- struct request *rq = cmd->request;
-
- /*
- * Set the serial numbers back to zero
- */
- cmd->serial_number = 0;
-
- atomic_inc(&cmd->device->iodone_cnt);
- if (cmd->result)
- atomic_inc(&cmd->device->ioerr_cnt);
-
- BUG_ON(!rq);
-
- /*
- * The uptodate/nbytes values don't matter, as we allow partial
- * completes and thus will check this in the softirq callback
- */
- rq->completion_data = cmd;
- blk_complete_request(rq);
+ blk_complete_request(cmd->request);
}
/* Move this to a header if it becomes more generally useful */
return ret;
}
-/**
- * scsi_add_timer - Start timeout timer for a single scsi command.
- * @scmd: scsi command that is about to start running.
- * @timeout: amount of time to allow this command to run.
- * @complete: timeout function to call if timer isn't canceled.
- *
- * Notes:
- * This should be turned into an inline function. Each scsi command
- * has its own timer, and as it is added to the queue, we set up the
- * timer. When the command completes, we cancel the timer.
- */
-void scsi_add_timer(struct scsi_cmnd *scmd, int timeout,
- void (*complete)(struct scsi_cmnd *))
-{
-
- /*
- * If the clock was already running for this command, then
- * first delete the timer. The timer handling code gets rather
- * confused if we don't do this.
- */
- if (scmd->eh_timeout.function)
- del_timer(&scmd->eh_timeout);
-
- scmd->eh_timeout.data = (unsigned long)scmd;
- scmd->eh_timeout.expires = jiffies + timeout;
- scmd->eh_timeout.function = (void (*)(unsigned long)) complete;
-
- SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p, time:"
- " %d, (%p)\n", __func__,
- scmd, timeout, complete));
-
- add_timer(&scmd->eh_timeout);
-}
-
-/**
- * scsi_delete_timer - Delete/cancel timer for a given function.
- * @scmd: Cmd that we are canceling timer for
- *
- * Notes:
- * This should be turned into an inline function.
- *
- * Return value:
- * 1 if we were able to detach the timer. 0 if we blew it, and the
- * timer function has already started to run.
- */
-int scsi_delete_timer(struct scsi_cmnd *scmd)
-{
- int rtn;
-
- rtn = del_timer(&scmd->eh_timeout);
-
- SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p,"
- " rtn: %d\n", __func__,
- scmd, rtn));
-
- scmd->eh_timeout.data = (unsigned long)NULL;
- scmd->eh_timeout.function = NULL;
-
- return rtn;
-}
-
/**
* scsi_times_out - Timeout function for normal scsi commands.
- * @scmd: Cmd that is timing out.
+ * @req: request that is timing out.
*
* Notes:
* We do not need to lock this. There is the potential for a race
* normal completion function determines that the timer has already
* fired, then it mustn't do anything.
*/
-void scsi_times_out(struct scsi_cmnd *scmd)
+enum blk_eh_timer_return scsi_times_out(struct request *req)
{
- enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
+ struct scsi_cmnd *scmd = req->special;
+ enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
+ enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED;
scsi_log_completion(scmd, TIMEOUT_ERROR);
eh_timed_out = NULL;
if (eh_timed_out)
- switch (eh_timed_out(scmd)) {
- case EH_HANDLED:
- __scsi_done(scmd);
- return;
- case EH_RESET_TIMER:
- scsi_add_timer(scmd, scmd->timeout_per_command,
- scsi_times_out);
- return;
- case EH_NOT_HANDLED:
+ rtn = eh_timed_out(scmd);
+ switch (rtn) {
+ case BLK_EH_NOT_HANDLED:
break;
+ default:
+ return rtn;
}
if (unlikely(!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) {
scmd->result |= DID_TIME_OUT << 16;
- __scsi_done(scmd);
+ return BLK_EH_HANDLED;
}
+
+ return BLK_EH_NOT_HANDLED;
}
/**
blk_rq_init(NULL, &req);
scmd->request = &req;
- memset(&scmd->eh_timeout, 0, sizeof(scmd->eh_timeout));
scmd->cmnd = req.cmd;
scmd->sc_data_direction = DMA_BIDIRECTIONAL;
- init_timer(&scmd->eh_timeout);
-
spin_lock_irqsave(shost->host_lock, flags);
shost->tmf_in_progress = 1;
spin_unlock_irqrestore(shost->host_lock, flags);
cmd->transfersize = req->data_len;
cmd->allowed = req->retries;
- cmd->timeout_per_command = req->timeout;
return BLKPREP_OK;
}
EXPORT_SYMBOL(scsi_setup_blk_pc_cmnd);
spin_unlock(shost->host_lock);
spin_lock(sdev->request_queue->queue_lock);
- __scsi_done(cmd);
+ blk_complete_request(req);
}
static void scsi_softirq_done(struct request *rq)
{
- struct scsi_cmnd *cmd = rq->completion_data;
- unsigned long wait_for = (cmd->allowed + 1) * cmd->timeout_per_command;
+ struct scsi_cmnd *cmd = rq->special;
+ unsigned long wait_for = (cmd->allowed + 1) * rq->timeout;
int disposition;
INIT_LIST_HEAD(&cmd->eh_entry);
+ /*
+ * Set the serial numbers back to zero
+ */
+ cmd->serial_number = 0;
+
+ atomic_inc(&cmd->device->iodone_cnt);
+ if (cmd->result)
+ atomic_inc(&cmd->device->ioerr_cnt);
+
disposition = scsi_decide_disposition(cmd);
if (disposition != SUCCESS &&
time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) {
blk_queue_prep_rq(q, scsi_prep_fn);
blk_queue_softirq_done(q, scsi_softirq_done);
+ blk_queue_rq_timed_out(q, scsi_times_out);
return q;
}
#include <linux/device.h>
struct request_queue;
+struct request;
struct scsi_cmnd;
struct scsi_device;
struct scsi_host_template;
extern int scsi_dispatch_cmd(struct scsi_cmnd *cmd);
extern int scsi_setup_command_freelist(struct Scsi_Host *shost);
extern void scsi_destroy_command_freelist(struct Scsi_Host *shost);
-extern void __scsi_done(struct scsi_cmnd *cmd);
#ifdef CONFIG_SCSI_LOGGING
void scsi_log_send(struct scsi_cmnd *cmd);
void scsi_log_completion(struct scsi_cmnd *cmd, int disposition);
extern void scsi_exit_devinfo(void);
/* scsi_error.c */
-extern void scsi_add_timer(struct scsi_cmnd *, int,
- void (*)(struct scsi_cmnd *));
-extern int scsi_delete_timer(struct scsi_cmnd *);
-extern void scsi_times_out(struct scsi_cmnd *cmd);
+extern enum blk_eh_timer_return scsi_times_out(struct request *req);
extern int scsi_error_handler(void *host);
extern int scsi_decide_disposition(struct scsi_cmnd *cmd);
extern void scsi_eh_wakeup(struct Scsi_Host *shost);
sdev_rd_attr (model, "%.16s\n");
sdev_rd_attr (rev, "%.4s\n");
+/*
+ * TODO: can we make these symlinks to the block layer ones?
+ */
static ssize_t
sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_device *sdev;
sdev = to_scsi_device(dev);
- return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
+ return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
}
static ssize_t
int timeout;
sdev = to_scsi_device(dev);
sscanf (buf, "%d\n", &timeout);
- sdev->timeout = timeout * HZ;
+ blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
return count;
}
static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
int err;
dprintk("%lx %u\n", uaddr, len);
- err = blk_rq_map_user(q, rq, (void *)uaddr, len);
+ err = blk_rq_map_user(q, rq, NULL, (void *)uaddr, len, GFP_KERNEL);
if (err) {
/*
* TODO: need to fixup sg_tablesize, max_segment_size,
* Notes:
* This routine assumes no locks are held on entry.
*/
-static enum scsi_eh_timer_return
+static enum blk_eh_timer_return
fc_timed_out(struct scsi_cmnd *scmd)
{
struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
if (rport->port_state == FC_PORTSTATE_BLOCKED)
- return EH_RESET_TIMER;
+ return BLK_EH_RESET_TIMER;
- return EH_NOT_HANDLED;
+ return BLK_EH_NOT_HANDLED;
}
/*
MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
+#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
+#define SD_MINORS 16
+#else
+#define SD_MINORS 0
+#endif
+
static int sd_revalidate_disk(struct gendisk *);
static int sd_probe(struct device *);
static int sd_remove(struct device *);
sd_print_sense_hdr(sdkp, &sshdr);
return -EINVAL;
}
- sd_revalidate_disk(sdkp->disk);
+ revalidate_disk(sdkp->disk);
return count;
}
sector_t block = rq->sector;
sector_t threshold;
unsigned int this_count = rq->nr_sectors;
- unsigned int timeout = sdp->timeout;
int ret;
if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
SCpnt->transfersize = sdp->sector_size;
SCpnt->underflow = this_count << 9;
SCpnt->allowed = SD_MAX_RETRIES;
- SCpnt->timeout_per_command = timeout;
/*
* This indicates that the command is ready from our end to be
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
if (sdkp) {
- sd_revalidate_disk(sdkp->disk);
+ revalidate_disk(sdkp->disk);
scsi_disk_put(sdkp);
}
}
return 0;
}
+/**
+ * sd_format_disk_name - format disk name
+ * @prefix: name prefix - ie. "sd" for SCSI disks
+ * @index: index of the disk to format name for
+ * @buf: output buffer
+ * @buflen: length of the output buffer
+ *
+ * SCSI disk names starts at sda. The 26th device is sdz and the
+ * 27th is sdaa. The last one for two lettered suffix is sdzz
+ * which is followed by sdaaa.
+ *
+ * This is basically 26 base counting with one extra 'nil' entry
+ * at the beggining from the second digit on and can be
+ * determined using similar method as 26 base conversion with the
+ * index shifted -1 after each digit is computed.
+ *
+ * CONTEXT:
+ * Don't care.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
+{
+ const int base = 'z' - 'a' + 1;
+ char *begin = buf + strlen(prefix);
+ char *end = buf + buflen;
+ char *p;
+ int unit;
+
+ p = end - 1;
+ *p = '\0';
+ unit = base;
+ do {
+ if (p == begin)
+ return -EINVAL;
+ *--p = 'a' + (index % unit);
+ index = (index / unit) - 1;
+ } while (index >= 0);
+
+ memmove(begin, p, end - p);
+ memcpy(buf, prefix, strlen(prefix));
+
+ return 0;
+}
+
/**
* sd_probe - called during driver initialization and whenever a
* new scsi device is attached to the system. It is called once
if (!sdkp)
goto out;
- gd = alloc_disk(16);
+ gd = alloc_disk(SD_MINORS);
if (!gd)
goto out_free;
if (error)
goto out_put;
- error = -EBUSY;
- if (index >= SD_MAX_DISKS)
+ error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
+ if (error)
goto out_free_index;
sdkp->device = sdp;
sdkp->openers = 0;
sdkp->previous_state = 1;
- if (!sdp->timeout) {
+ if (!sdp->request_queue->rq_timeout) {
if (sdp->type != TYPE_MOD)
- sdp->timeout = SD_TIMEOUT;
+ blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
else
- sdp->timeout = SD_MOD_TIMEOUT;
+ blk_queue_rq_timeout(sdp->request_queue,
+ SD_MOD_TIMEOUT);
}
device_initialize(&sdkp->dev);
get_device(&sdp->sdev_gendev);
- gd->major = sd_major((index & 0xf0) >> 4);
- gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
- gd->minors = 16;
- gd->fops = &sd_fops;
-
- if (index < 26) {
- sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
- } else if (index < (26 + 1) * 26) {
- sprintf(gd->disk_name, "sd%c%c",
- 'a' + index / 26 - 1,'a' + index % 26);
- } else {
- const unsigned int m1 = (index / 26 - 1) / 26 - 1;
- const unsigned int m2 = (index / 26 - 1) % 26;
- const unsigned int m3 = index % 26;
- sprintf(gd->disk_name, "sd%c%c%c",
- 'a' + m1, 'a' + m2, 'a' + m3);
+ if (index < SD_MAX_DISKS) {
+ gd->major = sd_major((index & 0xf0) >> 4);
+ gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
+ gd->minors = SD_MINORS;
}
-
+ gd->fops = &sd_fops;
gd->private_data = &sdkp->driver;
gd->queue = sdkp->device->request_queue;
blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
gd->driverfs_dev = &sdp->sdev_gendev;
- gd->flags = GENHD_FL_DRIVERFS;
+ gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
if (sdp->removable)
gd->flags |= GENHD_FL_REMOVABLE;
#include <linux/seq_file.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
-#include <linux/scatterlist.h>
#include <linux/blktrace_api.h>
#include <linux/smp_lock.h>
#endif
#define SG_ALLOW_DIO_DEF 0
-#define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
#define SG_MAX_DEVS 32768
unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
unsigned bufflen; /* Size of (aggregate) data buffer */
- unsigned b_malloc_len; /* actual len malloc'ed in buffer */
- struct scatterlist *buffer;/* scatter list */
+ struct page **pages;
+ int page_order;
char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
unsigned char cmd_opcode; /* first byte of command */
} Sg_scatter_hold;
char orphan; /* 1 -> drop on sight, 0 -> normal */
char sg_io_owned; /* 1 -> packet belongs to SG_IO */
volatile char done; /* 0->before bh, 1->before read, 2->read */
+ struct request *rq;
+ struct bio *bio;
} Sg_request;
typedef struct sg_fd { /* holds the state of a file descriptor */
static int sg_fasync(int fd, struct file *filp, int mode);
/* tasklet or soft irq callback */
-static void sg_cmd_done(void *data, char *sense, int result, int resid);
-static int sg_start_req(Sg_request * srp);
+static void sg_rq_end_io(struct request *rq, int uptodate);
+static int sg_start_req(Sg_request *srp, unsigned char *cmd);
static void sg_finish_rem_req(Sg_request * srp);
static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
int read_only, Sg_request **o_srp);
static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
unsigned char *cmnd, int timeout, int blocking);
-static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
- int wr_xf, int *countp, unsigned char __user **up);
-static int sg_write_xfer(Sg_request * srp);
-static int sg_read_xfer(Sg_request * srp);
static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
static void sg_remove_scat(Sg_scatter_hold * schp);
static void sg_build_reserve(Sg_fd * sfp, int req_size);
static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
-static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
-static void sg_page_free(struct page *page, int size);
static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
static Sg_request *sg_add_request(Sg_fd * sfp);
static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
static int sg_res_in_use(Sg_fd * sfp);
-static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
static Sg_device *sg_get_dev(int dev);
#ifdef CONFIG_SCSI_PROC_FS
static int sg_last_dev(void);
err = -EFAULT;
goto err_out;
}
- err = sg_read_xfer(srp);
- err_out:
+err_out:
sg_finish_rem_req(srp);
return (0 == err) ? count : err;
}
else
hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
hp->dxfer_len = mxsize;
- hp->dxferp = (char __user *)buf + cmd_size;
+ if (hp->dxfer_direction == SG_DXFER_TO_DEV)
+ hp->dxferp = (char __user *)buf + cmd_size;
+ else
+ hp->dxferp = NULL;
hp->sbp = NULL;
hp->timeout = old_hdr.reply_len; /* structure abuse ... */
hp->flags = input_size; /* structure abuse ... */
SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
(int) cmnd[0], (int) hp->cmd_len));
- if ((k = sg_start_req(srp))) {
+ k = sg_start_req(srp, cmnd);
+ if (k) {
SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
sg_finish_rem_req(srp);
return k; /* probably out of space --> ENOMEM */
}
- if ((k = sg_write_xfer(srp))) {
- SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
- sg_finish_rem_req(srp);
- return k;
- }
if (sdp->detached) {
sg_finish_rem_req(srp);
return -ENODEV;
break;
}
hp->duration = jiffies_to_msecs(jiffies);
-/* Now send everything of to mid-level. The next time we hear about this
- packet is when sg_cmd_done() is called (i.e. a callback). */
- if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer,
- hp->dxfer_len, srp->data.k_use_sg, timeout,
- SG_DEFAULT_RETRIES, srp, sg_cmd_done,
- GFP_ATOMIC)) {
- SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n"));
- /*
- * most likely out of mem, but could also be a bad map
- */
- sg_finish_rem_req(srp);
- return -ENOMEM;
- } else
- return 0;
+
+ srp->rq->timeout = timeout;
+ blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
+ srp->rq, 1, sg_rq_end_io);
+ return 0;
}
static int
Sg_fd *sfp;
unsigned long offset, len, sa;
Sg_scatter_hold *rsv_schp;
- struct scatterlist *sg;
- int k;
+ int k, length;
if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
return VM_FAULT_SIGBUS;
return VM_FAULT_SIGBUS;
SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
offset, rsv_schp->k_use_sg));
- sg = rsv_schp->buffer;
sa = vma->vm_start;
- for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
- ++k, sg = sg_next(sg)) {
+ length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
+ for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
len = vma->vm_end - sa;
- len = (len < sg->length) ? len : sg->length;
+ len = (len < length) ? len : length;
if (offset < len) {
- struct page *page;
- page = virt_to_page(page_address(sg_page(sg)) + offset);
+ struct page *page = nth_page(rsv_schp->pages[k],
+ offset >> PAGE_SHIFT);
get_page(page); /* increment page count */
vmf->page = page;
return 0; /* success */
Sg_fd *sfp;
unsigned long req_sz, len, sa;
Sg_scatter_hold *rsv_schp;
- int k;
- struct scatterlist *sg;
+ int k, length;
if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
return -ENXIO;
return -ENOMEM; /* cannot map more than reserved buffer */
sa = vma->vm_start;
- sg = rsv_schp->buffer;
- for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
- ++k, sg = sg_next(sg)) {
+ length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
+ for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
len = vma->vm_end - sa;
- len = (len < sg->length) ? len : sg->length;
+ len = (len < length) ? len : length;
sa += len;
}
return 0;
}
-/* This function is a "bottom half" handler that is called by the
- * mid level when a command is completed (or has failed). */
-static void
-sg_cmd_done(void *data, char *sense, int result, int resid)
+/*
+ * This function is a "bottom half" handler that is called by the mid
+ * level when a command is completed (or has failed).
+ */
+static void sg_rq_end_io(struct request *rq, int uptodate)
{
- Sg_request *srp = data;
+ struct sg_request *srp = rq->end_io_data;
Sg_device *sdp = NULL;
Sg_fd *sfp;
unsigned long iflags;
unsigned int ms;
+ char *sense;
+ int result, resid;
if (NULL == srp) {
printk(KERN_ERR "sg_cmd_done: NULL request\n");
return;
}
+ sense = rq->sense;
+ result = rq->errors;
+ resid = rq->data_len;
SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
sdp->disk->disk_name, srp->header.pack_id, result));
if (0 != result) {
struct scsi_sense_hdr sshdr;
- memcpy(srp->sense_b, sense, sizeof (srp->sense_b));
srp->header.status = 0xff & result;
srp->header.masked_status = status_byte(result);
srp->header.msg_status = msg_byte(result);
idr_destroy(&sg_index_idr);
}
-static int
-sg_start_req(Sg_request * srp)
+static int sg_start_req(Sg_request *srp, unsigned char *cmd)
{
int res;
+ struct request *rq;
Sg_fd *sfp = srp->parentfp;
sg_io_hdr_t *hp = &srp->header;
int dxfer_len = (int) hp->dxfer_len;
int dxfer_dir = hp->dxfer_direction;
+ unsigned int iov_count = hp->iovec_count;
Sg_scatter_hold *req_schp = &srp->data;
Sg_scatter_hold *rsv_schp = &sfp->reserve;
+ struct request_queue *q = sfp->parentdp->device->request_queue;
+ struct rq_map_data *md, map_data;
+ int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
+
+ SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
+ dxfer_len));
+
+ rq = blk_get_request(q, rw, GFP_ATOMIC);
+ if (!rq)
+ return -ENOMEM;
+
+ memcpy(rq->cmd, cmd, hp->cmd_len);
+
+ rq->cmd_len = hp->cmd_len;
+ rq->cmd_type = REQ_TYPE_BLOCK_PC;
+
+ srp->rq = rq;
+ rq->end_io_data = srp;
+ rq->sense = srp->sense_b;
+ rq->retries = SG_DEFAULT_RETRIES;
- SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
return 0;
- if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
- (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
- (!sfp->parentdp->device->host->unchecked_isa_dma)) {
- res = sg_build_direct(srp, sfp, dxfer_len);
- if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
- return res;
- }
- if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
- sg_link_reserve(sfp, srp, dxfer_len);
- else {
- res = sg_build_indirect(req_schp, sfp, dxfer_len);
- if (res) {
- sg_remove_scat(req_schp);
- return res;
+
+ if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
+ dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
+ !sfp->parentdp->device->host->unchecked_isa_dma &&
+ blk_rq_aligned(q, hp->dxferp, dxfer_len))
+ md = NULL;
+ else
+ md = &map_data;
+
+ if (md) {
+ if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
+ sg_link_reserve(sfp, srp, dxfer_len);
+ else {
+ res = sg_build_indirect(req_schp, sfp, dxfer_len);
+ if (res)
+ return res;
}
+
+ md->pages = req_schp->pages;
+ md->page_order = req_schp->page_order;
+ md->nr_entries = req_schp->k_use_sg;
}
- return 0;
+
+ if (iov_count)
+ res = blk_rq_map_user_iov(q, rq, md, hp->dxferp, iov_count,
+ hp->dxfer_len, GFP_ATOMIC);
+ else
+ res = blk_rq_map_user(q, rq, md, hp->dxferp,
+ hp->dxfer_len, GFP_ATOMIC);
+
+ if (!res) {
+ srp->bio = rq->bio;
+
+ if (!md) {
+ req_schp->dio_in_use = 1;
+ hp->info |= SG_INFO_DIRECT_IO;
+ }
+ }
+ return res;
}
static void
sg_unlink_reserve(sfp, srp);
else
sg_remove_scat(req_schp);
+
+ if (srp->rq) {
+ if (srp->bio)
+ blk_rq_unmap_user(srp->bio);
+
+ blk_put_request(srp->rq);
+ }
+
sg_remove_request(sfp, srp);
}
static int
sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
{
- int sg_bufflen = tablesize * sizeof(struct scatterlist);
+ int sg_bufflen = tablesize * sizeof(struct page *);
gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
- /*
- * TODO: test without low_dma, we should not need it since
- * the block layer will bounce the buffer for us
- *
- * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list.
- */
- if (sfp->low_dma)
- gfp_flags |= GFP_DMA;
- schp->buffer = kzalloc(sg_bufflen, gfp_flags);
- if (!schp->buffer)
+ schp->pages = kzalloc(sg_bufflen, gfp_flags);
+ if (!schp->pages)
return -ENOMEM;
- sg_init_table(schp->buffer, tablesize);
schp->sglist_len = sg_bufflen;
return tablesize; /* number of scat_gath elements allocated */
}
-#ifdef SG_ALLOW_DIO_CODE
-/* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
- /* TODO: hopefully we can use the generic block layer code */
-
-/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
- - mapping of all pages not successful
- (i.e., either completely successful or fails)
-*/
-static int
-st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
- unsigned long uaddr, size_t count, int rw)
-{
- unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
- unsigned long start = uaddr >> PAGE_SHIFT;
- const int nr_pages = end - start;
- int res, i, j;
- struct page **pages;
-
- /* User attempted Overflow! */
- if ((uaddr + count) < uaddr)
- return -EINVAL;
-
- /* Too big */
- if (nr_pages > max_pages)
- return -ENOMEM;
-
- /* Hmm? */
- if (count == 0)
- return 0;
-
- if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
- return -ENOMEM;
-
- /* Try to fault in all of the necessary pages */
- down_read(¤t->mm->mmap_sem);
- /* rw==READ means read from drive, write into memory area */
- res = get_user_pages(
- current,
- current->mm,
- uaddr,
- nr_pages,
- rw == READ,
- 0, /* don't force */
- pages,
- NULL);
- up_read(¤t->mm->mmap_sem);
-
- /* Errors and no page mapped should return here */
- if (res < nr_pages)
- goto out_unmap;
-
- for (i=0; i < nr_pages; i++) {
- /* FIXME: flush superflous for rw==READ,
- * probably wrong function for rw==WRITE
- */
- flush_dcache_page(pages[i]);
- /* ?? Is locking needed? I don't think so */
- /* if (!trylock_page(pages[i]))
- goto out_unlock; */
- }
-
- sg_set_page(sgl, pages[0], 0, uaddr & ~PAGE_MASK);
- if (nr_pages > 1) {
- sgl[0].length = PAGE_SIZE - sgl[0].offset;
- count -= sgl[0].length;
- for (i=1; i < nr_pages ; i++)
- sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0);
- }
- else {
- sgl[0].length = count;
- }
-
- kfree(pages);
- return nr_pages;
-
- out_unmap:
- if (res > 0) {
- for (j=0; j < res; j++)
- page_cache_release(pages[j]);
- res = 0;
- }
- kfree(pages);
- return res;
-}
-
-
-/* And unmap them... */
-static int
-st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
- int dirtied)
-{
- int i;
-
- for (i=0; i < nr_pages; i++) {
- struct page *page = sg_page(&sgl[i]);
-
- if (dirtied)
- SetPageDirty(page);
- /* unlock_page(page); */
- /* FIXME: cache flush missing for rw==READ
- * FIXME: call the correct reference counting function
- */
- page_cache_release(page);
- }
-
- return 0;
-}
-
-/* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
-#endif
-
-
-/* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
-static int
-sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
-{
-#ifdef SG_ALLOW_DIO_CODE
- sg_io_hdr_t *hp = &srp->header;
- Sg_scatter_hold *schp = &srp->data;
- int sg_tablesize = sfp->parentdp->sg_tablesize;
- int mx_sc_elems, res;
- struct scsi_device *sdev = sfp->parentdp->device;
-
- if (((unsigned long)hp->dxferp &
- queue_dma_alignment(sdev->request_queue)) != 0)
- return 1;
-
- mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
- if (mx_sc_elems <= 0) {
- return 1;
- }
- res = st_map_user_pages(schp->buffer, mx_sc_elems,
- (unsigned long)hp->dxferp, dxfer_len,
- (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0);
- if (res <= 0) {
- sg_remove_scat(schp);
- return 1;
- }
- schp->k_use_sg = res;
- schp->dio_in_use = 1;
- hp->info |= SG_INFO_DIRECT_IO;
- return 0;
-#else
- return 1;
-#endif
-}
-
static int
sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
{
- struct scatterlist *sg;
- int ret_sz = 0, k, rem_sz, num, mx_sc_elems;
+ int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
int sg_tablesize = sfp->parentdp->sg_tablesize;
- int blk_size = buff_size;
- struct page *p = NULL;
+ int blk_size = buff_size, order;
+ gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
if (blk_size < 0)
return -EFAULT;
} else
scatter_elem_sz_prev = num;
}
- for (k = 0, sg = schp->buffer, rem_sz = blk_size;
- (rem_sz > 0) && (k < mx_sc_elems);
- ++k, rem_sz -= ret_sz, sg = sg_next(sg)) {
-
+
+ if (sfp->low_dma)
+ gfp_mask |= GFP_DMA;
+
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+ gfp_mask |= __GFP_ZERO;
+
+ order = get_order(num);
+retry:
+ ret_sz = 1 << (PAGE_SHIFT + order);
+
+ for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
+ k++, rem_sz -= ret_sz) {
+
num = (rem_sz > scatter_elem_sz_prev) ?
- scatter_elem_sz_prev : rem_sz;
- p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
- if (!p)
- return -ENOMEM;
+ scatter_elem_sz_prev : rem_sz;
+
+ schp->pages[k] = alloc_pages(gfp_mask, order);
+ if (!schp->pages[k])
+ goto out;
if (num == scatter_elem_sz_prev) {
if (unlikely(ret_sz > scatter_elem_sz_prev)) {
scatter_elem_sz_prev = ret_sz;
}
}
- sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0);
SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
"ret_sz=%d\n", k, num, ret_sz));
} /* end of for loop */
+ schp->page_order = order;
schp->k_use_sg = k;
SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
"rem_sz=%d\n", k, rem_sz));
schp->bufflen = blk_size;
if (rem_sz > 0) /* must have failed */
return -ENOMEM;
-
return 0;
-}
-
-static int
-sg_write_xfer(Sg_request * srp)
-{
- sg_io_hdr_t *hp = &srp->header;
- Sg_scatter_hold *schp = &srp->data;
- struct scatterlist *sg = schp->buffer;
- int num_xfer = 0;
- int j, k, onum, usglen, ksglen, res;
- int iovec_count = (int) hp->iovec_count;
- int dxfer_dir = hp->dxfer_direction;
- unsigned char *p;
- unsigned char __user *up;
- int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
-
- if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
- (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
- num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
- if (schp->bufflen < num_xfer)
- num_xfer = schp->bufflen;
- }
- if ((num_xfer <= 0) || (schp->dio_in_use) ||
- (new_interface
- && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
- return 0;
-
- SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
- num_xfer, iovec_count, schp->k_use_sg));
- if (iovec_count) {
- onum = iovec_count;
- if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
- return -EFAULT;
- } else
- onum = 1;
-
- ksglen = sg->length;
- p = page_address(sg_page(sg));
- for (j = 0, k = 0; j < onum; ++j) {
- res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
- if (res)
- return res;
-
- for (; p; sg = sg_next(sg), ksglen = sg->length,
- p = page_address(sg_page(sg))) {
- if (usglen <= 0)
- break;
- if (ksglen > usglen) {
- if (usglen >= num_xfer) {
- if (__copy_from_user(p, up, num_xfer))
- return -EFAULT;
- return 0;
- }
- if (__copy_from_user(p, up, usglen))
- return -EFAULT;
- p += usglen;
- ksglen -= usglen;
- break;
- } else {
- if (ksglen >= num_xfer) {
- if (__copy_from_user(p, up, num_xfer))
- return -EFAULT;
- return 0;
- }
- if (__copy_from_user(p, up, ksglen))
- return -EFAULT;
- up += ksglen;
- usglen -= ksglen;
- }
- ++k;
- if (k >= schp->k_use_sg)
- return 0;
- }
- }
-
- return 0;
-}
+out:
+ for (i = 0; i < k; i++)
+ __free_pages(schp->pages[k], order);
-static int
-sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
- int wr_xf, int *countp, unsigned char __user **up)
-{
- int num_xfer = (int) hp->dxfer_len;
- unsigned char __user *p = hp->dxferp;
- int count;
+ if (--order >= 0)
+ goto retry;
- if (0 == sg_num) {
- if (wr_xf && ('\0' == hp->interface_id))
- count = (int) hp->flags; /* holds "old" input_size */
- else
- count = num_xfer;
- } else {
- sg_iovec_t iovec;
- if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
- return -EFAULT;
- p = iovec.iov_base;
- count = (int) iovec.iov_len;
- }
- if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
- return -EFAULT;
- if (up)
- *up = p;
- if (countp)
- *countp = count;
- return 0;
+ return -ENOMEM;
}
static void
sg_remove_scat(Sg_scatter_hold * schp)
{
SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
- if (schp->buffer && (schp->sglist_len > 0)) {
- struct scatterlist *sg = schp->buffer;
-
- if (schp->dio_in_use) {
-#ifdef SG_ALLOW_DIO_CODE
- st_unmap_user_pages(sg, schp->k_use_sg, TRUE);
-#endif
- } else {
+ if (schp->pages && schp->sglist_len > 0) {
+ if (!schp->dio_in_use) {
int k;
- for (k = 0; (k < schp->k_use_sg) && sg_page(sg);
- ++k, sg = sg_next(sg)) {
+ for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
SCSI_LOG_TIMEOUT(5, printk(
- "sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
- k, sg_page(sg), sg->length));
- sg_page_free(sg_page(sg), sg->length);
+ "sg_remove_scat: k=%d, pg=0x%p\n",
+ k, schp->pages[k]));
+ __free_pages(schp->pages[k], schp->page_order);
}
- }
- kfree(schp->buffer);
- }
- memset(schp, 0, sizeof (*schp));
-}
-static int
-sg_read_xfer(Sg_request * srp)
-{
- sg_io_hdr_t *hp = &srp->header;
- Sg_scatter_hold *schp = &srp->data;
- struct scatterlist *sg = schp->buffer;
- int num_xfer = 0;
- int j, k, onum, usglen, ksglen, res;
- int iovec_count = (int) hp->iovec_count;
- int dxfer_dir = hp->dxfer_direction;
- unsigned char *p;
- unsigned char __user *up;
- int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
-
- if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
- || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
- num_xfer = hp->dxfer_len;
- if (schp->bufflen < num_xfer)
- num_xfer = schp->bufflen;
- }
- if ((num_xfer <= 0) || (schp->dio_in_use) ||
- (new_interface
- && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
- return 0;
-
- SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
- num_xfer, iovec_count, schp->k_use_sg));
- if (iovec_count) {
- onum = iovec_count;
- if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
- return -EFAULT;
- } else
- onum = 1;
-
- p = page_address(sg_page(sg));
- ksglen = sg->length;
- for (j = 0, k = 0; j < onum; ++j) {
- res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
- if (res)
- return res;
-
- for (; p; sg = sg_next(sg), ksglen = sg->length,
- p = page_address(sg_page(sg))) {
- if (usglen <= 0)
- break;
- if (ksglen > usglen) {
- if (usglen >= num_xfer) {
- if (__copy_to_user(up, p, num_xfer))
- return -EFAULT;
- return 0;
- }
- if (__copy_to_user(up, p, usglen))
- return -EFAULT;
- p += usglen;
- ksglen -= usglen;
- break;
- } else {
- if (ksglen >= num_xfer) {
- if (__copy_to_user(up, p, num_xfer))
- return -EFAULT;
- return 0;
- }
- if (__copy_to_user(up, p, ksglen))
- return -EFAULT;
- up += ksglen;
- usglen -= ksglen;
- }
- ++k;
- if (k >= schp->k_use_sg)
- return 0;
+ kfree(schp->pages);
}
}
-
- return 0;
+ memset(schp, 0, sizeof (*schp));
}
static int
sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
{
Sg_scatter_hold *schp = &srp->data;
- struct scatterlist *sg = schp->buffer;
int k, num;
SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
if ((!outp) || (num_read_xfer <= 0))
return 0;
- for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) {
- num = sg->length;
+ num = 1 << (PAGE_SHIFT + schp->page_order);
+ for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
if (num > num_read_xfer) {
- if (__copy_to_user(outp, page_address(sg_page(sg)),
+ if (__copy_to_user(outp, page_address(schp->pages[k]),
num_read_xfer))
return -EFAULT;
break;
} else {
- if (__copy_to_user(outp, page_address(sg_page(sg)),
+ if (__copy_to_user(outp, page_address(schp->pages[k]),
num))
return -EFAULT;
num_read_xfer -= num;
{
Sg_scatter_hold *req_schp = &srp->data;
Sg_scatter_hold *rsv_schp = &sfp->reserve;
- struct scatterlist *sg = rsv_schp->buffer;
int k, num, rem;
srp->res_used = 1;
SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
rem = size;
- for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) {
- num = sg->length;
+ num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
+ for (k = 0; k < rsv_schp->k_use_sg; k++) {
if (rem <= num) {
- sfp->save_scat_len = num;
- sg->length = rem;
req_schp->k_use_sg = k + 1;
req_schp->sglist_len = rsv_schp->sglist_len;
- req_schp->buffer = rsv_schp->buffer;
+ req_schp->pages = rsv_schp->pages;
req_schp->bufflen = size;
- req_schp->b_malloc_len = rsv_schp->b_malloc_len;
+ req_schp->page_order = rsv_schp->page_order;
break;
} else
rem -= num;
sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
{
Sg_scatter_hold *req_schp = &srp->data;
- Sg_scatter_hold *rsv_schp = &sfp->reserve;
SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
(int) req_schp->k_use_sg));
- if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
- struct scatterlist *sg = rsv_schp->buffer;
-
- if (sfp->save_scat_len > 0)
- (sg + (req_schp->k_use_sg - 1))->length =
- (unsigned) sfp->save_scat_len;
- else
- SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
- }
req_schp->k_use_sg = 0;
req_schp->bufflen = 0;
- req_schp->buffer = NULL;
+ req_schp->pages = NULL;
+ req_schp->page_order = 0;
req_schp->sglist_len = 0;
sfp->save_scat_len = 0;
srp->res_used = 0;
return srp ? 1 : 0;
}
-/* The size fetched (value output via retSzp) set when non-NULL return */
-static struct page *
-sg_page_malloc(int rqSz, int lowDma, int *retSzp)
-{
- struct page *resp = NULL;
- gfp_t page_mask;
- int order, a_size;
- int resSz;
-
- if ((rqSz <= 0) || (NULL == retSzp))
- return resp;
-
- if (lowDma)
- page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN;
- else
- page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
-
- for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
- order++, a_size <<= 1) ;
- resSz = a_size; /* rounded up if necessary */
- resp = alloc_pages(page_mask, order);
- while ((!resp) && order) {
- --order;
- a_size >>= 1; /* divide by 2, until PAGE_SIZE */
- resp = alloc_pages(page_mask, order); /* try half */
- resSz = a_size;
- }
- if (resp) {
- if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
- memset(page_address(resp), 0, resSz);
- *retSzp = resSz;
- }
- return resp;
-}
-
-static void
-sg_page_free(struct page *page, int size)
-{
- int order, a_size;
-
- if (!page)
- return;
- for (order = 0, a_size = PAGE_SIZE; a_size < size;
- order++, a_size <<= 1) ;
- __free_pages(page, order);
-}
-
#ifdef CONFIG_SCSI_PROC_FS
static int
sg_idr_max_id(int id, void *p, void *data)
static int sr_prep_fn(struct request_queue *q, struct request *rq)
{
- int block=0, this_count, s_size, timeout = SR_TIMEOUT;
+ int block = 0, this_count, s_size;
struct scsi_cd *cd;
struct scsi_cmnd *SCpnt;
struct scsi_device *sdp = q->queuedata;
SCpnt->transfersize = cd->device->sector_size;
SCpnt->underflow = this_count << 9;
SCpnt->allowed = MAX_RETRIES;
- SCpnt->timeout_per_command = timeout;
/*
* This indicates that the command is ready from our end to be
disk->fops = &sr_bdops;
disk->flags = GENHD_FL_CD;
+ blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
+
cd->device = sdev;
cd->disk = disk;
cd->driver = &sr_template;
struct gendisk *disk = cd->disk;
spin_lock(&sr_index_lock);
- clear_bit(disk->first_minor, sr_index_bits);
+ clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
spin_unlock(&sr_index_lock);
unregister_cdrom(&cd->cdi);
* Shorten our settle_time if needed for
* this command not to time out.
*/
- if (np->s.settle_time_valid && cmd->timeout_per_command) {
- unsigned long tlimit = jiffies + cmd->timeout_per_command;
+ if (np->s.settle_time_valid && cmd->request->timeout) {
+ unsigned long tlimit = jiffies + cmd->request->timeout;
tlimit -= SYM_CONF_TIMER_INTERVAL*2;
if (time_after(np->s.settle_time, tlimit)) {
np->s.settle_time = tlimit;
BUG_ON(bip == NULL);
/* A cloned bio doesn't own the integrity metadata */
- if (!bio_flagged(bio, BIO_CLONED) && bip->bip_buf != NULL)
+ if (!bio_flagged(bio, BIO_CLONED) && !bio_flagged(bio, BIO_FS_INTEGRITY)
+ && bip->bip_buf != NULL)
kfree(bip->bip_buf);
mempool_free(bip->bip_vec, bs->bvec_pools[bip->bip_pool]);
}
EXPORT_SYMBOL(bio_integrity_add_page);
+static int bdev_integrity_enabled(struct block_device *bdev, int rw)
+{
+ struct blk_integrity *bi = bdev_get_integrity(bdev);
+
+ if (bi == NULL)
+ return 0;
+
+ if (rw == READ && bi->verify_fn != NULL &&
+ (bi->flags & INTEGRITY_FLAG_READ))
+ return 1;
+
+ if (rw == WRITE && bi->generate_fn != NULL &&
+ (bi->flags & INTEGRITY_FLAG_WRITE))
+ return 1;
+
+ return 0;
+}
+
/**
* bio_integrity_enabled - Check whether integrity can be passed
* @bio: bio to check
}
}
+static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi)
+{
+ if (bi)
+ return bi->tuple_size;
+
+ return 0;
+}
+
/**
* bio_integrity_prep - Prepare bio for integrity I/O
* @bio: bio to prepare
static struct kmem_cache *bio_slab __read_mostly;
-mempool_t *bio_split_pool __read_mostly;
+static mempool_t *bio_split_pool __read_mostly;
/*
* if you change this list, also change bvec_alloc or things will
struct bio_vec *bvl;
/*
- * see comment near bvec_array define!
+ * If 'bs' is given, lookup the pool and do the mempool alloc.
+ * If not, this is a bio_kmalloc() allocation and just do a
+ * kzalloc() for the exact number of vecs right away.
*/
- switch (nr) {
- case 1 : *idx = 0; break;
- case 2 ... 4: *idx = 1; break;
- case 5 ... 16: *idx = 2; break;
- case 17 ... 64: *idx = 3; break;
- case 65 ... 128: *idx = 4; break;
- case 129 ... BIO_MAX_PAGES: *idx = 5; break;
+ if (bs) {
+ /*
+ * see comment near bvec_array define!
+ */
+ switch (nr) {
+ case 1:
+ *idx = 0;
+ break;
+ case 2 ... 4:
+ *idx = 1;
+ break;
+ case 5 ... 16:
+ *idx = 2;
+ break;
+ case 17 ... 64:
+ *idx = 3;
+ break;
+ case 65 ... 128:
+ *idx = 4;
+ break;
+ case 129 ... BIO_MAX_PAGES:
+ *idx = 5;
+ break;
default:
return NULL;
- }
- /*
- * idx now points to the pool we want to allocate from
- */
+ }
- bvl = mempool_alloc(bs->bvec_pools[*idx], gfp_mask);
- if (bvl)
- memset(bvl, 0, bvec_nr_vecs(*idx) * sizeof(struct bio_vec));
+ /*
+ * idx now points to the pool we want to allocate from
+ */
+ bvl = mempool_alloc(bs->bvec_pools[*idx], gfp_mask);
+ if (bvl)
+ memset(bvl, 0,
+ bvec_nr_vecs(*idx) * sizeof(struct bio_vec));
+ } else
+ bvl = kzalloc(nr * sizeof(struct bio_vec), gfp_mask);
return bvl;
}
bio_free(bio, fs_bio_set);
}
+static void bio_kmalloc_destructor(struct bio *bio)
+{
+ kfree(bio->bi_io_vec);
+ kfree(bio);
+}
+
void bio_init(struct bio *bio)
{
memset(bio, 0, sizeof(*bio));
bio->bi_flags = 1 << BIO_UPTODATE;
+ bio->bi_comp_cpu = -1;
atomic_set(&bio->bi_cnt, 1);
}
* bio_alloc_bioset - allocate a bio for I/O
* @gfp_mask: the GFP_ mask given to the slab allocator
* @nr_iovecs: number of iovecs to pre-allocate
- * @bs: the bio_set to allocate from
+ * @bs: the bio_set to allocate from. If %NULL, just use kmalloc
*
* Description:
- * bio_alloc_bioset will first try it's on mempool to satisfy the allocation.
+ * bio_alloc_bioset will first try its own mempool to satisfy the allocation.
* If %__GFP_WAIT is set then we will block on the internal pool waiting
- * for a &struct bio to become free.
+ * for a &struct bio to become free. If a %NULL @bs is passed in, we will
+ * fall back to just using @kmalloc to allocate the required memory.
*
* allocate bio and iovecs from the memory pools specified by the
- * bio_set structure.
+ * bio_set structure, or @kmalloc if none given.
**/
struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
{
- struct bio *bio = mempool_alloc(bs->bio_pool, gfp_mask);
+ struct bio *bio;
+
+ if (bs)
+ bio = mempool_alloc(bs->bio_pool, gfp_mask);
+ else
+ bio = kmalloc(sizeof(*bio), gfp_mask);
if (likely(bio)) {
struct bio_vec *bvl = NULL;
bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, bs);
if (unlikely(!bvl)) {
- mempool_free(bio, bs->bio_pool);
+ if (bs)
+ mempool_free(bio, bs->bio_pool);
+ else
+ kfree(bio);
bio = NULL;
goto out;
}
return bio;
}
+/*
+ * Like bio_alloc(), but doesn't use a mempool backing. This means that
+ * it CAN fail, but while bio_alloc() can only be used for allocations
+ * that have a short (finite) life span, bio_kmalloc() should be used
+ * for more permanent bio allocations (like allocating some bio's for
+ * initalization or setup purposes).
+ */
+struct bio *bio_kmalloc(gfp_t gfp_mask, int nr_iovecs)
+{
+ struct bio *bio = bio_alloc_bioset(gfp_mask, nr_iovecs, NULL);
+
+ if (bio)
+ bio->bi_destructor = bio_kmalloc_destructor;
+
+ return bio;
+}
+
void zero_fill_bio(struct bio *bio)
{
unsigned long flags;
return bio->bi_phys_segments;
}
-inline int bio_hw_segments(struct request_queue *q, struct bio *bio)
-{
- if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
- blk_recount_segments(q, bio);
-
- return bio->bi_hw_segments;
-}
-
/**
* __bio_clone - clone a bio
* @bio: destination bio
*/
while (bio->bi_phys_segments >= q->max_phys_segments
- || bio->bi_hw_segments >= q->max_hw_segments
- || BIOVEC_VIRT_OVERSIZE(bio->bi_size)) {
+ || bio->bi_phys_segments >= q->max_hw_segments) {
if (retried_segments)
return 0;
}
/* If we may be able to merge these biovecs, force a recount */
- if (bio->bi_vcnt && (BIOVEC_PHYS_MERGEABLE(bvec-1, bvec) ||
- BIOVEC_VIRT_MERGEABLE(bvec-1, bvec)))
+ if (bio->bi_vcnt && (BIOVEC_PHYS_MERGEABLE(bvec-1, bvec)))
bio->bi_flags &= ~(1 << BIO_SEG_VALID);
bio->bi_vcnt++;
bio->bi_phys_segments++;
- bio->bi_hw_segments++;
done:
bio->bi_size += len;
return len;
struct bio_map_data {
struct bio_vec *iovecs;
- int nr_sgvecs;
struct sg_iovec *sgvecs;
+ int nr_sgvecs;
+ int is_our_pages;
};
static void bio_set_map_data(struct bio_map_data *bmd, struct bio *bio,
- struct sg_iovec *iov, int iov_count)
+ struct sg_iovec *iov, int iov_count,
+ int is_our_pages)
{
memcpy(bmd->iovecs, bio->bi_io_vec, sizeof(struct bio_vec) * bio->bi_vcnt);
memcpy(bmd->sgvecs, iov, sizeof(struct sg_iovec) * iov_count);
bmd->nr_sgvecs = iov_count;
+ bmd->is_our_pages = is_our_pages;
bio->bi_private = bmd;
}
}
static int __bio_copy_iov(struct bio *bio, struct bio_vec *iovecs,
- struct sg_iovec *iov, int iov_count, int uncopy)
+ struct sg_iovec *iov, int iov_count, int uncopy,
+ int do_free_page)
{
int ret = 0, i;
struct bio_vec *bvec;
}
}
- if (uncopy)
+ if (do_free_page)
__free_page(bvec->bv_page);
}
int bio_uncopy_user(struct bio *bio)
{
struct bio_map_data *bmd = bio->bi_private;
- int ret;
-
- ret = __bio_copy_iov(bio, bmd->iovecs, bmd->sgvecs, bmd->nr_sgvecs, 1);
+ int ret = 0;
+ if (!bio_flagged(bio, BIO_NULL_MAPPED))
+ ret = __bio_copy_iov(bio, bmd->iovecs, bmd->sgvecs,
+ bmd->nr_sgvecs, 1, bmd->is_our_pages);
bio_free_map_data(bmd);
bio_put(bio);
return ret;
/**
* bio_copy_user_iov - copy user data to bio
* @q: destination block queue
+ * @map_data: pointer to the rq_map_data holding pages (if necessary)
* @iov: the iovec.
* @iov_count: number of elements in the iovec
* @write_to_vm: bool indicating writing to pages or not
+ * @gfp_mask: memory allocation flags
*
* Prepares and returns a bio for indirect user io, bouncing data
* to/from kernel pages as necessary. Must be paired with
* call bio_uncopy_user() on io completion.
*/
-struct bio *bio_copy_user_iov(struct request_queue *q, struct sg_iovec *iov,
- int iov_count, int write_to_vm)
+struct bio *bio_copy_user_iov(struct request_queue *q,
+ struct rq_map_data *map_data,
+ struct sg_iovec *iov, int iov_count,
+ int write_to_vm, gfp_t gfp_mask)
{
struct bio_map_data *bmd;
struct bio_vec *bvec;
len += iov[i].iov_len;
}
- bmd = bio_alloc_map_data(nr_pages, iov_count, GFP_KERNEL);
+ bmd = bio_alloc_map_data(nr_pages, iov_count, gfp_mask);
if (!bmd)
return ERR_PTR(-ENOMEM);
ret = -ENOMEM;
- bio = bio_alloc(GFP_KERNEL, nr_pages);
+ bio = bio_alloc(gfp_mask, nr_pages);
if (!bio)
goto out_bmd;
bio->bi_rw |= (!write_to_vm << BIO_RW);
ret = 0;
+ i = 0;
while (len) {
- unsigned int bytes = PAGE_SIZE;
+ unsigned int bytes;
+
+ if (map_data)
+ bytes = 1U << (PAGE_SHIFT + map_data->page_order);
+ else
+ bytes = PAGE_SIZE;
if (bytes > len)
bytes = len;
- page = alloc_page(q->bounce_gfp | GFP_KERNEL);
+ if (map_data) {
+ if (i == map_data->nr_entries) {
+ ret = -ENOMEM;
+ break;
+ }
+ page = map_data->pages[i++];
+ } else
+ page = alloc_page(q->bounce_gfp | gfp_mask);
if (!page) {
ret = -ENOMEM;
break;
* success
*/
if (!write_to_vm) {
- ret = __bio_copy_iov(bio, bio->bi_io_vec, iov, iov_count, 0);
+ ret = __bio_copy_iov(bio, bio->bi_io_vec, iov, iov_count, 0, 0);
if (ret)
goto cleanup;
}
- bio_set_map_data(bmd, bio, iov, iov_count);
+ bio_set_map_data(bmd, bio, iov, iov_count, map_data ? 0 : 1);
return bio;
cleanup:
- bio_for_each_segment(bvec, bio, i)
- __free_page(bvec->bv_page);
+ if (!map_data)
+ bio_for_each_segment(bvec, bio, i)
+ __free_page(bvec->bv_page);
bio_put(bio);
out_bmd:
/**
* bio_copy_user - copy user data to bio
* @q: destination block queue
+ * @map_data: pointer to the rq_map_data holding pages (if necessary)
* @uaddr: start of user address
* @len: length in bytes
* @write_to_vm: bool indicating writing to pages or not
+ * @gfp_mask: memory allocation flags
*
* Prepares and returns a bio for indirect user io, bouncing data
* to/from kernel pages as necessary. Must be paired with
* call bio_uncopy_user() on io completion.
*/
-struct bio *bio_copy_user(struct request_queue *q, unsigned long uaddr,
- unsigned int len, int write_to_vm)
+struct bio *bio_copy_user(struct request_queue *q, struct rq_map_data *map_data,
+ unsigned long uaddr, unsigned int len,
+ int write_to_vm, gfp_t gfp_mask)
{
struct sg_iovec iov;
iov.iov_base = (void __user *)uaddr;
iov.iov_len = len;
- return bio_copy_user_iov(q, &iov, 1, write_to_vm);
+ return bio_copy_user_iov(q, map_data, &iov, 1, write_to_vm, gfp_mask);
}
static struct bio *__bio_map_user_iov(struct request_queue *q,
struct block_device *bdev,
struct sg_iovec *iov, int iov_count,
- int write_to_vm)
+ int write_to_vm, gfp_t gfp_mask)
{
int i, j;
int nr_pages = 0;
if (!nr_pages)
return ERR_PTR(-EINVAL);
- bio = bio_alloc(GFP_KERNEL, nr_pages);
+ bio = bio_alloc(gfp_mask, nr_pages);
if (!bio)
return ERR_PTR(-ENOMEM);
ret = -ENOMEM;
- pages = kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL);
+ pages = kcalloc(nr_pages, sizeof(struct page *), gfp_mask);
if (!pages)
goto out;
* @uaddr: start of user address
* @len: length in bytes
* @write_to_vm: bool indicating writing to pages or not
+ * @gfp_mask: memory allocation flags
*
* Map the user space address into a bio suitable for io to a block
* device. Returns an error pointer in case of error.
*/
struct bio *bio_map_user(struct request_queue *q, struct block_device *bdev,
- unsigned long uaddr, unsigned int len, int write_to_vm)
+ unsigned long uaddr, unsigned int len, int write_to_vm,
+ gfp_t gfp_mask)
{
struct sg_iovec iov;
iov.iov_base = (void __user *)uaddr;
iov.iov_len = len;
- return bio_map_user_iov(q, bdev, &iov, 1, write_to_vm);
+ return bio_map_user_iov(q, bdev, &iov, 1, write_to_vm, gfp_mask);
}
/**
* @iov: the iovec.
* @iov_count: number of elements in the iovec
* @write_to_vm: bool indicating writing to pages or not
+ * @gfp_mask: memory allocation flags
*
* Map the user space address into a bio suitable for io to a block
* device. Returns an error pointer in case of error.
*/
struct bio *bio_map_user_iov(struct request_queue *q, struct block_device *bdev,
struct sg_iovec *iov, int iov_count,
- int write_to_vm)
+ int write_to_vm, gfp_t gfp_mask)
{
struct bio *bio;
- bio = __bio_map_user_iov(q, bdev, iov, iov_count, write_to_vm);
-
+ bio = __bio_map_user_iov(q, bdev, iov, iov_count, write_to_vm,
+ gfp_mask);
if (IS_ERR(bio))
return bio;
struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
gfp_t gfp_mask, int reading)
{
- unsigned long kaddr = (unsigned long)data;
- unsigned long end = (kaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
- unsigned long start = kaddr >> PAGE_SHIFT;
- const int nr_pages = end - start;
struct bio *bio;
struct bio_vec *bvec;
- struct bio_map_data *bmd;
- int i, ret;
- struct sg_iovec iov;
-
- iov.iov_base = data;
- iov.iov_len = len;
-
- bmd = bio_alloc_map_data(nr_pages, 1, gfp_mask);
- if (!bmd)
- return ERR_PTR(-ENOMEM);
-
- ret = -ENOMEM;
- bio = bio_alloc(gfp_mask, nr_pages);
- if (!bio)
- goto out_bmd;
-
- while (len) {
- struct page *page;
- unsigned int bytes = PAGE_SIZE;
-
- if (bytes > len)
- bytes = len;
-
- page = alloc_page(q->bounce_gfp | gfp_mask);
- if (!page) {
- ret = -ENOMEM;
- goto cleanup;
- }
-
- if (bio_add_pc_page(q, bio, page, bytes, 0) < bytes) {
- ret = -EINVAL;
- goto cleanup;
- }
+ int i;
- len -= bytes;
- }
+ bio = bio_copy_user(q, NULL, (unsigned long)data, len, 1, gfp_mask);
+ if (IS_ERR(bio))
+ return bio;
if (!reading) {
void *p = data;
}
}
- bio->bi_private = bmd;
bio->bi_end_io = bio_copy_kern_endio;
- bio_set_map_data(bmd, bio, &iov, 1);
return bio;
-cleanup:
- bio_for_each_segment(bvec, bio, i)
- __free_page(bvec->bv_page);
-
- bio_put(bio);
-out_bmd:
- bio_free_map_data(bmd);
-
- return ERR_PTR(ret);
}
/*
* split a bio - only worry about a bio with a single page
* in it's iovec
*/
-struct bio_pair *bio_split(struct bio *bi, mempool_t *pool, int first_sectors)
+struct bio_pair *bio_split(struct bio *bi, int first_sectors)
{
- struct bio_pair *bp = mempool_alloc(pool, GFP_NOIO);
+ struct bio_pair *bp = mempool_alloc(bio_split_pool, GFP_NOIO);
if (!bp)
return bp;
bp->bio2.bi_end_io = bio_pair_end_2;
bp->bio1.bi_private = bi;
- bp->bio2.bi_private = pool;
+ bp->bio2.bi_private = bio_split_pool;
if (bio_integrity(bi))
bio_integrity_split(bi, bp, first_sectors);
return bp;
}
+/**
+ * bio_sector_offset - Find hardware sector offset in bio
+ * @bio: bio to inspect
+ * @index: bio_vec index
+ * @offset: offset in bv_page
+ *
+ * Return the number of hardware sectors between beginning of bio
+ * and an end point indicated by a bio_vec index and an offset
+ * within that vector's page.
+ */
+sector_t bio_sector_offset(struct bio *bio, unsigned short index,
+ unsigned int offset)
+{
+ unsigned int sector_sz = queue_hardsect_size(bio->bi_bdev->bd_disk->queue);
+ struct bio_vec *bv;
+ sector_t sectors;
+ int i;
+
+ sectors = 0;
+
+ if (index >= bio->bi_idx)
+ index = bio->bi_vcnt - 1;
+
+ __bio_for_each_segment(bv, bio, i, 0) {
+ if (i == index) {
+ if (offset > bv->bv_offset)
+ sectors += (offset - bv->bv_offset) / sector_sz;
+ break;
+ }
+
+ sectors += bv->bv_len / sector_sz;
+ }
+
+ return sectors;
+}
+EXPORT_SYMBOL(bio_sector_offset);
/*
* create memory pools for biovec's in a bio_set.
subsys_initcall(init_bio);
EXPORT_SYMBOL(bio_alloc);
+EXPORT_SYMBOL(bio_kmalloc);
EXPORT_SYMBOL(bio_put);
EXPORT_SYMBOL(bio_free);
EXPORT_SYMBOL(bio_endio);
EXPORT_SYMBOL(__bio_clone);
EXPORT_SYMBOL(bio_clone);
EXPORT_SYMBOL(bio_phys_segments);
-EXPORT_SYMBOL(bio_hw_segments);
EXPORT_SYMBOL(bio_add_page);
EXPORT_SYMBOL(bio_add_pc_page);
EXPORT_SYMBOL(bio_get_nr_vecs);
EXPORT_SYMBOL(bio_copy_kern);
EXPORT_SYMBOL(bio_pair_release);
EXPORT_SYMBOL(bio_split);
-EXPORT_SYMBOL(bio_split_pool);
EXPORT_SYMBOL(bio_copy_user);
EXPORT_SYMBOL(bio_uncopy_user);
EXPORT_SYMBOL(bioset_create);
* /sys/block/sda/holders/dm-0 --> /sys/block/dm-0
*/
-static struct kobject *bdev_get_kobj(struct block_device *bdev)
-{
- if (bdev->bd_contains != bdev)
- return kobject_get(&bdev->bd_part->dev.kobj);
- else
- return kobject_get(&bdev->bd_disk->dev.kobj);
-}
-
-static struct kobject *bdev_get_holder(struct block_device *bdev)
-{
- if (bdev->bd_contains != bdev)
- return kobject_get(bdev->bd_part->holder_dir);
- else
- return kobject_get(bdev->bd_disk->holder_dir);
-}
-
static int add_symlink(struct kobject *from, struct kobject *to)
{
if (!from || !to)
if (!bo->hdev)
goto fail_put_sdir;
- bo->sdev = bdev_get_kobj(bdev);
+ bo->sdev = kobject_get(&part_to_dev(bdev->bd_part)->kobj);
if (!bo->sdev)
goto fail_put_hdev;
- bo->hdir = bdev_get_holder(bdev);
+ bo->hdir = kobject_get(bdev->bd_part->holder_dir);
if (!bo->hdir)
goto fail_put_sdev;
EXPORT_SYMBOL(open_by_devnum);
+/**
+ * flush_disk - invalidates all buffer-cache entries on a disk
+ *
+ * @bdev: struct block device to be flushed
+ *
+ * Invalidates all buffer-cache entries on a disk. It should be called
+ * when a disk has been changed -- either by a media change or online
+ * resize.
+ */
+static void flush_disk(struct block_device *bdev)
+{
+ if (__invalidate_device(bdev)) {
+ char name[BDEVNAME_SIZE] = "";
+
+ if (bdev->bd_disk)
+ disk_name(bdev->bd_disk, 0, name);
+ printk(KERN_WARNING "VFS: busy inodes on changed media or "
+ "resized disk %s\n", name);
+ }
+
+ if (!bdev->bd_disk)
+ return;
+ if (disk_partitionable(bdev->bd_disk))
+ bdev->bd_invalidated = 1;
+}
+
+/**
+ * check_disk_size_change - checks for disk size change and adjusts bdev size.
+ * @disk: struct gendisk to check
+ * @bdev: struct bdev to adjust.
+ *
+ * This routine checks to see if the bdev size does not match the disk size
+ * and adjusts it if it differs.
+ */
+void check_disk_size_change(struct gendisk *disk, struct block_device *bdev)
+{
+ loff_t disk_size, bdev_size;
+
+ disk_size = (loff_t)get_capacity(disk) << 9;
+ bdev_size = i_size_read(bdev->bd_inode);
+ if (disk_size != bdev_size) {
+ char name[BDEVNAME_SIZE];
+
+ disk_name(disk, 0, name);
+ printk(KERN_INFO
+ "%s: detected capacity change from %lld to %lld\n",
+ name, bdev_size, disk_size);
+ i_size_write(bdev->bd_inode, disk_size);
+ flush_disk(bdev);
+ }
+}
+EXPORT_SYMBOL(check_disk_size_change);
+
+/**
+ * revalidate_disk - wrapper for lower-level driver's revalidate_disk call-back
+ * @disk: struct gendisk to be revalidated
+ *
+ * This routine is a wrapper for lower-level driver's revalidate_disk
+ * call-backs. It is used to do common pre and post operations needed
+ * for all revalidate_disk operations.
+ */
+int revalidate_disk(struct gendisk *disk)
+{
+ struct block_device *bdev;
+ int ret = 0;
+
+ if (disk->fops->revalidate_disk)
+ ret = disk->fops->revalidate_disk(disk);
+
+ bdev = bdget_disk(disk, 0);
+ if (!bdev)
+ return ret;
+
+ mutex_lock(&bdev->bd_mutex);
+ check_disk_size_change(disk, bdev);
+ mutex_unlock(&bdev->bd_mutex);
+ bdput(bdev);
+ return ret;
+}
+EXPORT_SYMBOL(revalidate_disk);
+
/*
* This routine checks whether a removable media has been changed,
* and invalidates all buffer-cache-entries in that case. This
if (!bdops->media_changed(bdev->bd_disk))
return 0;
- if (__invalidate_device(bdev))
- printk("VFS: busy inodes on changed media.\n");
-
+ flush_disk(bdev);
if (bdops->revalidate_disk)
bdops->revalidate_disk(bdev->bd_disk);
- if (bdev->bd_disk->minors > 1)
- bdev->bd_invalidated = 1;
return 1;
}
static int do_open(struct block_device *bdev, struct file *file, int for_part)
{
- struct module *owner = NULL;
struct gendisk *disk;
+ struct hd_struct *part = NULL;
int ret;
- int part;
+ int partno;
int perm = 0;
if (file->f_mode & FMODE_READ)
ret = -ENXIO;
file->f_mapping = bdev->bd_inode->i_mapping;
+
lock_kernel();
- disk = get_gendisk(bdev->bd_dev, &part);
- if (!disk) {
- unlock_kernel();
- bdput(bdev);
- return ret;
- }
- owner = disk->fops->owner;
+
+ disk = get_gendisk(bdev->bd_dev, &partno);
+ if (!disk)
+ goto out_unlock_kernel;
+ part = disk_get_part(disk, partno);
+ if (!part)
+ goto out_unlock_kernel;
mutex_lock_nested(&bdev->bd_mutex, for_part);
if (!bdev->bd_openers) {
bdev->bd_disk = disk;
+ bdev->bd_part = part;
bdev->bd_contains = bdev;
- if (!part) {
+ if (!partno) {
struct backing_dev_info *bdi;
if (disk->fops->open) {
ret = disk->fops->open(bdev->bd_inode, file);
if (ret)
- goto out_first;
+ goto out_clear;
}
if (!bdev->bd_openers) {
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
if (bdev->bd_invalidated)
rescan_partitions(disk, bdev);
} else {
- struct hd_struct *p;
struct block_device *whole;
whole = bdget_disk(disk, 0);
ret = -ENOMEM;
if (!whole)
- goto out_first;
+ goto out_clear;
BUG_ON(for_part);
ret = __blkdev_get(whole, file->f_mode, file->f_flags, 1);
if (ret)
- goto out_first;
+ goto out_clear;
bdev->bd_contains = whole;
- p = disk->part[part - 1];
bdev->bd_inode->i_data.backing_dev_info =
whole->bd_inode->i_data.backing_dev_info;
- if (!(disk->flags & GENHD_FL_UP) || !p || !p->nr_sects) {
+ if (!(disk->flags & GENHD_FL_UP) ||
+ !part || !part->nr_sects) {
ret = -ENXIO;
- goto out_first;
+ goto out_clear;
}
- kobject_get(&p->dev.kobj);
- bdev->bd_part = p;
- bd_set_size(bdev, (loff_t) p->nr_sects << 9);
+ bd_set_size(bdev, (loff_t)part->nr_sects << 9);
}
} else {
+ disk_put_part(part);
put_disk(disk);
- module_put(owner);
+ module_put(disk->fops->owner);
+ part = NULL;
+ disk = NULL;
if (bdev->bd_contains == bdev) {
if (bdev->bd_disk->fops->open) {
ret = bdev->bd_disk->fops->open(bdev->bd_inode, file);
if (ret)
- goto out;
+ goto out_unlock_bdev;
}
if (bdev->bd_invalidated)
rescan_partitions(bdev->bd_disk, bdev);
unlock_kernel();
return 0;
-out_first:
+ out_clear:
bdev->bd_disk = NULL;
+ bdev->bd_part = NULL;
bdev->bd_inode->i_data.backing_dev_info = &default_backing_dev_info;
if (bdev != bdev->bd_contains)
__blkdev_put(bdev->bd_contains, 1);
bdev->bd_contains = NULL;
- put_disk(disk);
- module_put(owner);
-out:
+ out_unlock_bdev:
mutex_unlock(&bdev->bd_mutex);
+ out_unlock_kernel:
unlock_kernel();
- if (ret)
- bdput(bdev);
+
+ disk_put_part(part);
+ if (disk)
+ module_put(disk->fops->owner);
+ put_disk(disk);
+ bdput(bdev);
+
return ret;
}
put_disk(disk);
module_put(owner);
-
- if (bdev->bd_contains != bdev) {
- kobject_put(&bdev->bd_part->dev.kobj);
- bdev->bd_part = NULL;
- }
+ disk_put_part(bdev->bd_part);
+ bdev->bd_part = NULL;
bdev->bd_disk = NULL;
bdev->bd_inode->i_data.backing_dev_info = &default_backing_dev_info;
if (bdev != bdev->bd_contains)
/**
* lookup_bdev - lookup a struct block_device by name
+ * @pathname: special file representing the block device
*
- * @path: special file representing the block device
- *
- * Get a reference to the blockdevice at @path in the current
+ * Get a reference to the blockdevice at @pathname in the current
* namespace if possible and return it. Return ERR_PTR(error)
* otherwise.
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/msdos_fs.h>
+#include <linux/blkdev.h>
struct fatent_operations {
void (*ent_blocknr)(struct super_block *, int, int *, sector_t *);
struct fat_entry fatent;
struct buffer_head *bhs[MAX_BUF_PER_PAGE];
int i, err, nr_bhs;
+ int first_cl = cluster;
nr_bhs = 0;
fatent_init(&fatent);
goto error;
}
+ /*
+ * Issue discard for the sectors we no longer care about,
+ * batching contiguous clusters into one request
+ */
+ if (cluster != fatent.entry + 1) {
+ int nr_clus = fatent.entry - first_cl + 1;
+
+ sb_issue_discard(sb, fat_clus_to_blknr(sbi, first_cl),
+ nr_clus * sbi->sec_per_clus);
+ first_cl = cluster;
+ }
+
ops->ent_put(&fatent, FAT_ENT_FREE);
if (sbi->free_clusters != -1) {
sbi->free_clusters++;
* a pointer to that same buffer (for convenience).
*/
-char *disk_name(struct gendisk *hd, int part, char *buf)
+char *disk_name(struct gendisk *hd, int partno, char *buf)
{
- if (!part)
+ if (!partno)
snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
- snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, part);
+ snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
else
- snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part);
+ snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
return buf;
}
const char *bdevname(struct block_device *bdev, char *buf)
{
- int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
- return disk_name(bdev->bd_disk, part, buf);
+ return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
}
EXPORT_SYMBOL(bdevname);
if (isdigit(state->name[strlen(state->name)-1]))
sprintf(state->name, "p");
- state->limit = hd->minors;
+ state->limit = disk_max_parts(hd);
i = res = err = 0;
while (!res && check_part[i]) {
memset(&state->parts, 0, sizeof(state->parts));
return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
}
-static ssize_t part_size_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+ssize_t part_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
}
-static ssize_t part_stat_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+ssize_t part_stat_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
+ int cpu;
- preempt_disable();
- part_round_stats(p);
- preempt_enable();
+ cpu = part_stat_lock();
+ part_round_stats(cpu, p);
+ part_stat_unlock();
return sprintf(buf,
"%8lu %8lu %8llu %8u "
"%8lu %8lu %8llu %8u "
}
#ifdef CONFIG_FAIL_MAKE_REQUEST
-static ssize_t part_fail_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+ssize_t part_fail_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
return sprintf(buf, "%d\n", p->make_it_fail);
}
-static ssize_t part_fail_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
+ssize_t part_fail_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
struct hd_struct *p = dev_to_part(dev);
int i;
.release = part_release,
};
-static inline void partition_sysfs_add_subdir(struct hd_struct *p)
-{
- struct kobject *k;
-
- k = kobject_get(&p->dev.kobj);
- p->holder_dir = kobject_create_and_add("holders", k);
- kobject_put(k);
-}
-
-static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
+static void delete_partition_rcu_cb(struct rcu_head *head)
{
- struct kobject *k;
+ struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
- k = kobject_get(&disk->dev.kobj);
- disk->holder_dir = kobject_create_and_add("holders", k);
- disk->slave_dir = kobject_create_and_add("slaves", k);
- kobject_put(k);
+ part->start_sect = 0;
+ part->nr_sects = 0;
+ part_stat_set_all(part, 0);
+ put_device(part_to_dev(part));
}
-void delete_partition(struct gendisk *disk, int part)
+void delete_partition(struct gendisk *disk, int partno)
{
- struct hd_struct *p = disk->part[part-1];
+ struct disk_part_tbl *ptbl = disk->part_tbl;
+ struct hd_struct *part;
- if (!p)
+ if (partno >= ptbl->len)
return;
- if (!p->nr_sects)
+
+ part = ptbl->part[partno];
+ if (!part)
return;
- disk->part[part-1] = NULL;
- p->start_sect = 0;
- p->nr_sects = 0;
- part_stat_set_all(p, 0);
- kobject_put(p->holder_dir);
- device_del(&p->dev);
- put_device(&p->dev);
+
+ blk_free_devt(part_devt(part));
+ rcu_assign_pointer(ptbl->part[partno], NULL);
+ kobject_put(part->holder_dir);
+ device_del(part_to_dev(part));
+
+ call_rcu(&part->rcu_head, delete_partition_rcu_cb);
}
static ssize_t whole_disk_show(struct device *dev,
static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
whole_disk_show, NULL);
-int add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)
+int add_partition(struct gendisk *disk, int partno,
+ sector_t start, sector_t len, int flags)
{
struct hd_struct *p;
+ dev_t devt = MKDEV(0, 0);
+ struct device *ddev = disk_to_dev(disk);
+ struct device *pdev;
+ struct disk_part_tbl *ptbl;
+ const char *dname;
int err;
+ err = disk_expand_part_tbl(disk, partno);
+ if (err)
+ return err;
+ ptbl = disk->part_tbl;
+
+ if (ptbl->part[partno])
+ return -EBUSY;
+
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
if (!init_part_stats(p)) {
err = -ENOMEM;
- goto out0;
+ goto out_free;
}
+ pdev = part_to_dev(p);
+
p->start_sect = start;
p->nr_sects = len;
- p->partno = part;
- p->policy = disk->policy;
+ p->partno = partno;
+ p->policy = get_disk_ro(disk);
- if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1]))
- snprintf(p->dev.bus_id, BUS_ID_SIZE,
- "%sp%d", disk->dev.bus_id, part);
+ dname = dev_name(ddev);
+ if (isdigit(dname[strlen(dname) - 1]))
+ snprintf(pdev->bus_id, BUS_ID_SIZE, "%sp%d", dname, partno);
else
- snprintf(p->dev.bus_id, BUS_ID_SIZE,
- "%s%d", disk->dev.bus_id, part);
+ snprintf(pdev->bus_id, BUS_ID_SIZE, "%s%d", dname, partno);
- device_initialize(&p->dev);
- p->dev.devt = MKDEV(disk->major, disk->first_minor + part);
- p->dev.class = &block_class;
- p->dev.type = &part_type;
- p->dev.parent = &disk->dev;
- disk->part[part-1] = p;
+ device_initialize(pdev);
+ pdev->class = &block_class;
+ pdev->type = &part_type;
+ pdev->parent = ddev;
+
+ err = blk_alloc_devt(p, &devt);
+ if (err)
+ goto out_free;
+ pdev->devt = devt;
/* delay uevent until 'holders' subdir is created */
- p->dev.uevent_suppress = 1;
- err = device_add(&p->dev);
+ pdev->uevent_suppress = 1;
+ err = device_add(pdev);
if (err)
- goto out1;
- partition_sysfs_add_subdir(p);
- p->dev.uevent_suppress = 0;
+ goto out_put;
+
+ err = -ENOMEM;
+ p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
+ if (!p->holder_dir)
+ goto out_del;
+
+ pdev->uevent_suppress = 0;
if (flags & ADDPART_FLAG_WHOLEDISK) {
- err = device_create_file(&p->dev, &dev_attr_whole_disk);
+ err = device_create_file(pdev, &dev_attr_whole_disk);
if (err)
- goto out2;
+ goto out_del;
}
+ /* everything is up and running, commence */
+ INIT_RCU_HEAD(&p->rcu_head);
+ rcu_assign_pointer(ptbl->part[partno], p);
+
/* suppress uevent if the disk supresses it */
- if (!disk->dev.uevent_suppress)
- kobject_uevent(&p->dev.kobj, KOBJ_ADD);
+ if (!ddev->uevent_suppress)
+ kobject_uevent(&pdev->kobj, KOBJ_ADD);
return 0;
-out2:
- device_del(&p->dev);
-out1:
- put_device(&p->dev);
- free_part_stats(p);
-out0:
+out_free:
kfree(p);
return err;
+out_del:
+ kobject_put(p->holder_dir);
+ device_del(pdev);
+out_put:
+ put_device(pdev);
+ blk_free_devt(devt);
+ return err;
}
/* Not exported, helper to add_disk(). */
void register_disk(struct gendisk *disk)
{
+ struct device *ddev = disk_to_dev(disk);
struct block_device *bdev;
+ struct disk_part_iter piter;
+ struct hd_struct *part;
char *s;
- int i;
- struct hd_struct *p;
int err;
- disk->dev.parent = disk->driverfs_dev;
- disk->dev.devt = MKDEV(disk->major, disk->first_minor);
+ ddev->parent = disk->driverfs_dev;
- strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE);
+ strlcpy(ddev->bus_id, disk->disk_name, BUS_ID_SIZE);
/* ewww... some of these buggers have / in the name... */
- s = strchr(disk->dev.bus_id, '/');
+ s = strchr(ddev->bus_id, '/');
if (s)
*s = '!';
/* delay uevents, until we scanned partition table */
- disk->dev.uevent_suppress = 1;
+ ddev->uevent_suppress = 1;
- if (device_add(&disk->dev))
+ if (device_add(ddev))
return;
#ifndef CONFIG_SYSFS_DEPRECATED
- err = sysfs_create_link(block_depr, &disk->dev.kobj,
- kobject_name(&disk->dev.kobj));
+ err = sysfs_create_link(block_depr, &ddev->kobj,
+ kobject_name(&ddev->kobj));
if (err) {
- device_del(&disk->dev);
+ device_del(ddev);
return;
}
#endif
- disk_sysfs_add_subdirs(disk);
+ disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
+ disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
/* No minors to use for partitions */
- if (disk->minors == 1)
+ if (!disk_partitionable(disk))
goto exit;
/* No such device (e.g., media were just removed) */
exit:
/* announce disk after possible partitions are created */
- disk->dev.uevent_suppress = 0;
- kobject_uevent(&disk->dev.kobj, KOBJ_ADD);
+ ddev->uevent_suppress = 0;
+ kobject_uevent(&ddev->kobj, KOBJ_ADD);
/* announce possible partitions */
- for (i = 1; i < disk->minors; i++) {
- p = disk->part[i-1];
- if (!p || !p->nr_sects)
- continue;
- kobject_uevent(&p->dev.kobj, KOBJ_ADD);
- }
+ disk_part_iter_init(&piter, disk, 0);
+ while ((part = disk_part_iter_next(&piter)))
+ kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
+ disk_part_iter_exit(&piter);
}
int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
{
+ struct disk_part_iter piter;
+ struct hd_struct *part;
struct parsed_partitions *state;
- int p, res;
+ int p, highest, res;
if (bdev->bd_part_count)
return -EBUSY;
res = invalidate_partition(disk, 0);
if (res)
return res;
- bdev->bd_invalidated = 0;
- for (p = 1; p < disk->minors; p++)
- delete_partition(disk, p);
+
+ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
+ while ((part = disk_part_iter_next(&piter)))
+ delete_partition(disk, part->partno);
+ disk_part_iter_exit(&piter);
+
if (disk->fops->revalidate_disk)
disk->fops->revalidate_disk(disk);
+ check_disk_size_change(disk, bdev);
+ bdev->bd_invalidated = 0;
if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
return 0;
if (IS_ERR(state)) /* I/O error reading the partition table */
return -EIO;
/* tell userspace that the media / partition table may have changed */
- kobject_uevent(&disk->dev.kobj, KOBJ_CHANGE);
+ kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
+ /* Detect the highest partition number and preallocate
+ * disk->part_tbl. This is an optimization and not strictly
+ * necessary.
+ */
+ for (p = 1, highest = 0; p < state->limit; p++)
+ if (state->parts[p].size)
+ highest = p;
+
+ disk_expand_part_tbl(disk, highest);
+
+ /* add partitions */
for (p = 1; p < state->limit; p++) {
sector_t size = state->parts[p].size;
sector_t from = state->parts[p].from;
void del_gendisk(struct gendisk *disk)
{
- int p;
+ struct disk_part_iter piter;
+ struct hd_struct *part;
/* invalidate stuff */
- for (p = disk->minors - 1; p > 0; p--) {
- invalidate_partition(disk, p);
- delete_partition(disk, p);
+ disk_part_iter_init(&piter, disk,
+ DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
+ while ((part = disk_part_iter_next(&piter))) {
+ invalidate_partition(disk, part->partno);
+ delete_partition(disk, part->partno);
}
+ disk_part_iter_exit(&piter);
+
invalidate_partition(disk, 0);
- disk->capacity = 0;
+ blk_free_devt(disk_to_dev(disk)->devt);
+ set_capacity(disk, 0);
disk->flags &= ~GENHD_FL_UP;
unlink_gendisk(disk);
- disk_stat_set_all(disk, 0);
- disk->stamp = 0;
+ part_stat_set_all(&disk->part0, 0);
+ disk->part0.stamp = 0;
- kobject_put(disk->holder_dir);
+ kobject_put(disk->part0.holder_dir);
kobject_put(disk->slave_dir);
disk->driverfs_dev = NULL;
#ifndef CONFIG_SYSFS_DEPRECATED
- sysfs_remove_link(block_depr, disk->dev.bus_id);
+ sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
#endif
- device_del(&disk->dev);
+ device_del(disk_to_dev(disk));
}
* add_gd_partition adds a partitions details to the devices partition
* description.
*/
-enum { MAX_PART = 256 };
-
struct parsed_partitions {
char name[BDEVNAME_SIZE];
struct {
sector_t from;
sector_t size;
int flags;
- } parts[MAX_PART];
+ } parts[DISK_MAX_PARTS];
int next;
int limit;
};
unifdef-y += auto_fs.h
unifdef-y += auxvec.h
unifdef-y += binfmts.h
+unifdef-y += blktrace_api.h
unifdef-y += capability.h
unifdef-y += capi.h
unifdef-y += cciss_ioctl.h
ATA_ID_DLF = 128,
ATA_ID_CSFO = 129,
ATA_ID_CFA_POWER = 160,
+ ATA_ID_ROT_SPEED = 217,
ATA_ID_PIO4 = (1 << 1),
ATA_ID_SERNO_LEN = 20,
return 0;
}
+static inline int ata_id_is_ssd(const u16 *id)
+{
+ return id[ATA_ID_ROT_SPEED] == 0x01;
+}
+
static inline int ata_drive_40wire(const u16 *dev_id)
{
if (ata_id_is_sata(dev_id))
#ifdef CONFIG_BLOCK
-/* Platforms may set this to teach the BIO layer about IOMMU hardware. */
#include <asm/io.h>
-#if defined(BIO_VMERGE_MAX_SIZE) && defined(BIO_VMERGE_BOUNDARY)
-#define BIOVEC_VIRT_START_SIZE(x) (bvec_to_phys(x) & (BIO_VMERGE_BOUNDARY - 1))
-#define BIOVEC_VIRT_OVERSIZE(x) ((x) > BIO_VMERGE_MAX_SIZE)
-#else
-#define BIOVEC_VIRT_START_SIZE(x) 0
-#define BIOVEC_VIRT_OVERSIZE(x) 0
-#endif
-
-#ifndef BIO_VMERGE_BOUNDARY
-#define BIO_VMERGE_BOUNDARY 0
-#endif
-
#define BIO_DEBUG
#ifdef BIO_DEBUG
/* Number of segments in this BIO after
* physical address coalescing is performed.
*/
- unsigned short bi_phys_segments;
-
- /* Number of segments after physical and DMA remapping
- * hardware coalescing is performed.
- */
- unsigned short bi_hw_segments;
+ unsigned int bi_phys_segments;
unsigned int bi_size; /* residual I/O count */
- /*
- * To keep track of the max hw size, we account for the
- * sizes of the first and last virtually mergeable segments
- * in this bio
- */
- unsigned int bi_hw_front_size;
- unsigned int bi_hw_back_size;
-
unsigned int bi_max_vecs; /* max bvl_vecs we can hold */
+ unsigned int bi_comp_cpu; /* completion CPU */
+
struct bio_vec *bi_io_vec; /* the actual vec list */
bio_end_io_t *bi_end_io;
#define BIO_UPTODATE 0 /* ok after I/O completion */
#define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */
#define BIO_EOF 2 /* out-out-bounds error */
-#define BIO_SEG_VALID 3 /* nr_hw_seg valid */
+#define BIO_SEG_VALID 3 /* bi_phys_segments valid */
#define BIO_CLONED 4 /* doesn't own data */
#define BIO_BOUNCED 5 /* bio is a bounce bio */
#define BIO_USER_MAPPED 6 /* contains user pages */
#define BIO_EOPNOTSUPP 7 /* not supported */
+#define BIO_CPU_AFFINE 8 /* complete bio on same CPU as submitted */
+#define BIO_NULL_MAPPED 9 /* contains invalid user pages */
+#define BIO_FS_INTEGRITY 10 /* fs owns integrity data, not block layer */
#define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
/*
/*
* bio bi_rw flags
*
- * bit 0 -- read (not set) or write (set)
+ * bit 0 -- data direction
+ * If not set, bio is a read from device. If set, it's a write to device.
* bit 1 -- rw-ahead when set
* bit 2 -- barrier
+ * Insert a serialization point in the IO queue, forcing previously
+ * submitted IO to be completed before this oen is issued.
* bit 3 -- fail fast, don't want low level driver retries
* bit 4 -- synchronous I/O hint: the block layer will unplug immediately
+ * Note that this does NOT indicate that the IO itself is sync, just
+ * that the block layer will not postpone issue of this IO by plugging.
+ * bit 5 -- metadata request
+ * Used for tracing to differentiate metadata and data IO. May also
+ * get some preferential treatment in the IO scheduler
+ * bit 6 -- discard sectors
+ * Informs the lower level device that this range of sectors is no longer
+ * used by the file system and may thus be freed by the device. Used
+ * for flash based storage.
*/
-#define BIO_RW 0
-#define BIO_RW_AHEAD 1
+#define BIO_RW 0 /* Must match RW in req flags (blkdev.h) */
+#define BIO_RW_AHEAD 1 /* Must match FAILFAST in req flags */
#define BIO_RW_BARRIER 2
#define BIO_RW_FAILFAST 3
#define BIO_RW_SYNC 4
#define BIO_RW_META 5
+#define BIO_RW_DISCARD 6
/*
* upper 16 bits of bi_rw define the io priority of this bio
#define bio_failfast(bio) ((bio)->bi_rw & (1 << BIO_RW_FAILFAST))
#define bio_rw_ahead(bio) ((bio)->bi_rw & (1 << BIO_RW_AHEAD))
#define bio_rw_meta(bio) ((bio)->bi_rw & (1 << BIO_RW_META))
-#define bio_empty_barrier(bio) (bio_barrier(bio) && !(bio)->bi_size)
+#define bio_discard(bio) ((bio)->bi_rw & (1 << BIO_RW_DISCARD))
+#define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio))
static inline unsigned int bio_cur_sectors(struct bio *bio)
{
if (bio->bi_vcnt)
return bio_iovec(bio)->bv_len >> 9;
-
- return 0;
+ else /* dataless requests such as discard */
+ return bio->bi_size >> 9;
}
static inline void *bio_data(struct bio *bio)
((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
#endif
-#define BIOVEC_VIRT_MERGEABLE(vec1, vec2) \
- ((((bvec_to_phys((vec1)) + (vec1)->bv_len) | bvec_to_phys((vec2))) & (BIO_VMERGE_BOUNDARY - 1)) == 0)
#define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \
(((addr1) | (mask)) == (((addr2) - 1) | (mask)))
#define BIOVEC_SEG_BOUNDARY(q, b1, b2) \
atomic_t cnt;
int error;
};
-extern struct bio_pair *bio_split(struct bio *bi, mempool_t *pool,
- int first_sectors);
-extern mempool_t *bio_split_pool;
+extern struct bio_pair *bio_split(struct bio *bi, int first_sectors);
extern void bio_pair_release(struct bio_pair *dbio);
extern struct bio_set *bioset_create(int, int);
extern void bioset_free(struct bio_set *);
extern struct bio *bio_alloc(gfp_t, int);
+extern struct bio *bio_kmalloc(gfp_t, int);
extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *);
extern void bio_put(struct bio *);
extern void bio_free(struct bio *, struct bio_set *);
extern void bio_endio(struct bio *, int);
struct request_queue;
extern int bio_phys_segments(struct request_queue *, struct bio *);
-extern int bio_hw_segments(struct request_queue *, struct bio *);
extern void __bio_clone(struct bio *, struct bio *);
extern struct bio *bio_clone(struct bio *, gfp_t);
extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *,
unsigned int, unsigned int);
extern int bio_get_nr_vecs(struct block_device *);
+extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int);
extern struct bio *bio_map_user(struct request_queue *, struct block_device *,
- unsigned long, unsigned int, int);
+ unsigned long, unsigned int, int, gfp_t);
struct sg_iovec;
+struct rq_map_data;
extern struct bio *bio_map_user_iov(struct request_queue *,
struct block_device *,
- struct sg_iovec *, int, int);
+ struct sg_iovec *, int, int, gfp_t);
extern void bio_unmap_user(struct bio *);
extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
gfp_t);
gfp_t, int);
extern void bio_set_pages_dirty(struct bio *bio);
extern void bio_check_pages_dirty(struct bio *bio);
-extern struct bio *bio_copy_user(struct request_queue *, unsigned long, unsigned int, int);
-extern struct bio *bio_copy_user_iov(struct request_queue *, struct sg_iovec *,
- int, int);
+extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
+ unsigned long, unsigned int, int, gfp_t);
+extern struct bio *bio_copy_user_iov(struct request_queue *,
+ struct rq_map_data *, struct sg_iovec *,
+ int, int, gfp_t);
extern int bio_uncopy_user(struct bio *);
void zero_fill_bio(struct bio *bio);
extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *);
extern unsigned int bvec_nr_vecs(unsigned short idx);
+/*
+ * Allow queuer to specify a completion CPU for this bio
+ */
+static inline void bio_set_completion_cpu(struct bio *bio, unsigned int cpu)
+{
+ bio->bi_comp_cpu = cpu;
+}
+
/*
* bio_set is used to allow other portions of the IO system to
* allocate their own private memory pools for bio and iovec structures.
__bio_kmap_irq((bio), (bio)->bi_idx, (flags))
#define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
+/*
+ * Check whether this bio carries any data or not. A NULL bio is allowed.
+ */
+static inline int bio_has_data(struct bio *bio)
+{
+ return bio && bio->bi_io_vec != NULL;
+}
+
#if defined(CONFIG_BLK_DEV_INTEGRITY)
#define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)]))
#define bip_for_each_vec(bvl, bip, i) \
__bip_for_each_vec(bvl, bip, i, (bip)->bip_idx)
-static inline int bio_integrity(struct bio *bio)
-{
-#if defined(CONFIG_BLK_DEV_INTEGRITY)
- return bio->bi_integrity != NULL;
-#else
- return 0;
-#endif
-}
+#define bio_integrity(bio) (bio->bi_integrity != NULL)
extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *);
extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int);
#include <linux/bio.h>
#include <linux/module.h>
#include <linux/stringify.h>
+#include <linux/gfp.h>
#include <linux/bsg.h>
+#include <linux/smp.h>
#include <asm/scatterlist.h>
REQ_TYPE_PM_SUSPEND, /* suspend request */
REQ_TYPE_PM_RESUME, /* resume request */
REQ_TYPE_PM_SHUTDOWN, /* shutdown request */
- REQ_TYPE_FLUSH, /* flush request */
REQ_TYPE_SPECIAL, /* driver defined type */
REQ_TYPE_LINUX_BLOCK, /* generic block layer message */
/*
*
*/
enum {
- /*
- * just examples for now
- */
REQ_LB_OP_EJECT = 0x40, /* eject request */
- REQ_LB_OP_FLUSH = 0x41, /* flush device */
+ REQ_LB_OP_FLUSH = 0x41, /* flush request */
+ REQ_LB_OP_DISCARD = 0x42, /* discard sectors */
};
/*
- * request type modified bits. first three bits match BIO_RW* bits, important
+ * request type modified bits. first two bits match BIO_RW* bits, important
*/
enum rq_flag_bits {
__REQ_RW, /* not set, read. set, write */
__REQ_FAILFAST, /* no low level driver retries */
+ __REQ_DISCARD, /* request to discard sectors */
__REQ_SORTED, /* elevator knows about this request */
__REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
__REQ_HARDBARRIER, /* may not be passed by drive either */
};
#define REQ_RW (1 << __REQ_RW)
+#define REQ_DISCARD (1 << __REQ_DISCARD)
#define REQ_FAILFAST (1 << __REQ_FAILFAST)
#define REQ_SORTED (1 << __REQ_SORTED)
#define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
*/
struct request {
struct list_head queuelist;
- struct list_head donelist;
+ struct call_single_data csd;
+ int cpu;
struct request_queue *q;
unsigned int cmd_flags;
enum rq_cmd_type_bits cmd_type;
+ unsigned long atomic_flags;
/* Maintain bio traversal state for part by part I/O submission.
* hard_* are block layer internals, no driver should touch them!
*/
unsigned short nr_phys_segments;
- /* Number of scatter-gather addr+len pairs after
- * physical and DMA remapping hardware coalescing is performed.
- * This is the number of scatter-gather entries the driver
- * will actually have to deal with after DMA mapping is done.
- */
- unsigned short nr_hw_segments;
-
unsigned short ioprio;
void *special;
void *data;
void *sense;
+ unsigned long deadline;
+ struct list_head timeout_list;
unsigned int timeout;
int retries;
struct request *next_rq;
};
+static inline unsigned short req_get_ioprio(struct request *req)
+{
+ return req->ioprio;
+}
+
/*
* State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
* requests. Some step values could eventually be made generic.
typedef int (make_request_fn) (struct request_queue *q, struct bio *bio);
typedef int (prep_rq_fn) (struct request_queue *, struct request *);
typedef void (unplug_fn) (struct request_queue *);
+typedef int (prepare_discard_fn) (struct request_queue *, struct request *);
struct bio_vec;
struct bvec_merge_data {
typedef void (prepare_flush_fn) (struct request_queue *, struct request *);
typedef void (softirq_done_fn)(struct request *);
typedef int (dma_drain_needed_fn)(struct request *);
+typedef int (lld_busy_fn) (struct request_queue *q);
+
+enum blk_eh_timer_return {
+ BLK_EH_NOT_HANDLED,
+ BLK_EH_HANDLED,
+ BLK_EH_RESET_TIMER,
+};
+
+typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
enum blk_queue_state {
Queue_down,
make_request_fn *make_request_fn;
prep_rq_fn *prep_rq_fn;
unplug_fn *unplug_fn;
+ prepare_discard_fn *prepare_discard_fn;
merge_bvec_fn *merge_bvec_fn;
prepare_flush_fn *prepare_flush_fn;
softirq_done_fn *softirq_done_fn;
+ rq_timed_out_fn *rq_timed_out_fn;
dma_drain_needed_fn *dma_drain_needed;
+ lld_busy_fn *lld_busy_fn;
/*
* Dispatch queue sorting
unsigned int nr_sorted;
unsigned int in_flight;
+ unsigned int rq_timeout;
+ struct timer_list timeout;
+ struct list_head timeout_list;
+
/*
* sg stuff
*/
#define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */
#define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */
#define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */
+#define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */
+#define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */
+#define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */
+#define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */
static inline int queue_is_locked(struct request_queue *q)
{
#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
+#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
#define blk_queue_flushing(q) ((q)->ordseq)
+#define blk_queue_stackable(q) \
+ test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
#define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS)
#define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC)
#define blk_noretry_request(rq) ((rq)->cmd_flags & REQ_FAILFAST)
#define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED)
-#define blk_account_rq(rq) (blk_rq_started(rq) && blk_fs_request(rq))
+#define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq)))
#define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND)
#define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME)
#define blk_pm_request(rq) \
(blk_pm_suspend_request(rq) || blk_pm_resume_request(rq))
+#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
#define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED)
#define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER)
#define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA)
+#define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD)
#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
#define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors)
/* rq->queuelist of dequeued request must be list_empty() */
#define RQ_NOMERGE_FLAGS \
(REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER)
#define rq_mergeable(rq) \
- (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && blk_fs_request((rq)))
+ (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \
+ (blk_discard_rq(rq) || blk_fs_request((rq))))
/*
* q->prep_rq_fn return values
}
#endif /* CONFIG_MMU */
+struct rq_map_data {
+ struct page **pages;
+ int page_order;
+ int nr_entries;
+};
+
struct req_iterator {
int i;
struct bio *bio;
extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
extern void blk_insert_request(struct request_queue *, struct request *, int, void *);
extern void blk_requeue_request(struct request_queue *, struct request *);
+extern int blk_rq_check_limits(struct request_queue *q, struct request *rq);
+extern int blk_lld_busy(struct request_queue *q);
+extern int blk_insert_cloned_request(struct request_queue *q,
+ struct request *rq);
extern void blk_plug_device(struct request_queue *);
extern void blk_plug_device_unlocked(struct request_queue *);
extern int blk_remove_plug(struct request_queue *);
extern void __blk_run_queue(struct request_queue *);
extern void blk_run_queue(struct request_queue *);
extern void blk_start_queueing(struct request_queue *);
-extern int blk_rq_map_user(struct request_queue *, struct request *, void __user *, unsigned long);
+extern int blk_rq_map_user(struct request_queue *, struct request *,
+ struct rq_map_data *, void __user *, unsigned long,
+ gfp_t);
extern int blk_rq_unmap_user(struct bio *);
extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
- struct sg_iovec *, int, unsigned int);
+ struct rq_map_data *, struct sg_iovec *, int,
+ unsigned int, gfp_t);
extern int blk_execute_rq(struct request_queue *, struct gendisk *,
struct request *, int);
extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
extern int blk_end_bidi_request(struct request *rq, int error,
unsigned int nr_bytes, unsigned int bidi_bytes);
extern void end_request(struct request *, int);
-extern void end_queued_request(struct request *, int);
-extern void end_dequeued_request(struct request *, int);
extern int blk_end_request_callback(struct request *rq, int error,
unsigned int nr_bytes,
int (drv_callback)(struct request *));
extern void blk_complete_request(struct request *);
+extern void __blk_complete_request(struct request *);
+extern void blk_abort_request(struct request *);
+extern void blk_abort_queue(struct request_queue *);
+extern void blk_update_request(struct request *rq, int error,
+ unsigned int nr_bytes);
/*
* blk_end_request() takes bytes instead of sectors as a complete size.
extern int blk_queue_dma_drain(struct request_queue *q,
dma_drain_needed_fn *dma_drain_needed,
void *buf, unsigned int size);
+extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *);
extern void blk_queue_dma_alignment(struct request_queue *, int);
extern void blk_queue_update_dma_alignment(struct request_queue *, int);
extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
+extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *);
+extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
+extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *);
extern int blk_do_ordered(struct request_queue *, struct request **);
}
extern int blkdev_issue_flush(struct block_device *, sector_t *);
+extern int blkdev_issue_discard(struct block_device *,
+ sector_t sector, sector_t nr_sects, gfp_t);
+
+static inline int sb_issue_discard(struct super_block *sb,
+ sector_t block, sector_t nr_blocks)
+{
+ block <<= (sb->s_blocksize_bits - 9);
+ nr_blocks <<= (sb->s_blocksize_bits - 9);
+ return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL);
+}
/*
* command filter functions
return q ? q->dma_alignment : 511;
}
+static inline int blk_rq_aligned(struct request_queue *q, void *addr,
+ unsigned int len)
+{
+ unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
+ return !((unsigned long)addr & alignment) && !(len & alignment);
+}
+
/* assumes size > 256 */
static inline unsigned int blksize_bits(unsigned int size)
{
}
struct work_struct;
-int kblockd_schedule_work(struct work_struct *work);
+int kblockd_schedule_work(struct request_queue *q, struct work_struct *work);
void kblockd_flush_work(struct work_struct *work);
#define MODULE_ALIAS_BLOCKDEV(major,minor) \
extern int blk_integrity_register(struct gendisk *, struct blk_integrity *);
extern void blk_integrity_unregister(struct gendisk *);
-extern int blk_integrity_compare(struct block_device *, struct block_device *);
+extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *);
extern int blk_rq_count_integrity_sg(struct request *);
-static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi)
-{
- if (bi)
- return bi->tuple_size;
-
- return 0;
-}
-
-static inline struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
+static inline
+struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
{
return bdev->bd_disk->integrity;
}
-static inline unsigned int bdev_get_tag_size(struct block_device *bdev)
+static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
{
- struct blk_integrity *bi = bdev_get_integrity(bdev);
-
- if (bi)
- return bi->tag_size;
-
- return 0;
-}
-
-static inline int bdev_integrity_enabled(struct block_device *bdev, int rw)
-{
- struct blk_integrity *bi = bdev_get_integrity(bdev);
-
- if (bi == NULL)
- return 0;
-
- if (rw == READ && bi->verify_fn != NULL &&
- (bi->flags & INTEGRITY_FLAG_READ))
- return 1;
-
- if (rw == WRITE && bi->generate_fn != NULL &&
- (bi->flags & INTEGRITY_FLAG_WRITE))
- return 1;
-
- return 0;
+ return disk->integrity;
}
static inline int blk_integrity_rq(struct request *rq)
#define blk_rq_count_integrity_sg(a) (0)
#define blk_rq_map_integrity_sg(a, b) (0)
#define bdev_get_integrity(a) (0)
-#define bdev_get_tag_size(a) (0)
+#define blk_get_integrity(a) (0)
#define blk_integrity_compare(a, b) (0)
#define blk_integrity_register(a, b) (0)
#define blk_integrity_unregister(a) do { } while (0);
#ifndef BLKTRACE_H
#define BLKTRACE_H
+#ifdef __KERNEL__
#include <linux/blkdev.h>
#include <linux/relay.h>
+#endif
/*
* Trace categories
BLK_TC_NOTIFY = 1 << 10, /* special message */
BLK_TC_AHEAD = 1 << 11, /* readahead */
BLK_TC_META = 1 << 12, /* metadata */
+ BLK_TC_DISCARD = 1 << 13, /* discard requests */
BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
};
__BLK_TA_SPLIT, /* bio was split */
__BLK_TA_BOUNCE, /* bio was bounced */
__BLK_TA_REMAP, /* bio was remapped */
+ __BLK_TA_ABORT, /* request aborted */
};
/*
#define BLK_TA_SPLIT (__BLK_TA_SPLIT)
#define BLK_TA_BOUNCE (__BLK_TA_BOUNCE)
#define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_ABORT (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY))
#define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY))
* The trace itself
*/
struct blk_io_trace {
- u32 magic; /* MAGIC << 8 | version */
- u32 sequence; /* event number */
- u64 time; /* in microseconds */
- u64 sector; /* disk offset */
- u32 bytes; /* transfer length */
- u32 action; /* what happened */
- u32 pid; /* who did it */
- u32 device; /* device number */
- u32 cpu; /* on what cpu did it happen */
- u16 error; /* completion error */
- u16 pdu_len; /* length of data after this trace */
+ __u32 magic; /* MAGIC << 8 | version */
+ __u32 sequence; /* event number */
+ __u64 time; /* in microseconds */
+ __u64 sector; /* disk offset */
+ __u32 bytes; /* transfer length */
+ __u32 action; /* what happened */
+ __u32 pid; /* who did it */
+ __u32 device; /* device number */
+ __u32 cpu; /* on what cpu did it happen */
+ __u16 error; /* completion error */
+ __u16 pdu_len; /* length of data after this trace */
};
/*
Blktrace_stopped,
};
+#define BLKTRACE_BDEV_SIZE 32
+
+/*
+ * User setup structure passed with BLKTRACESTART
+ */
+struct blk_user_trace_setup {
+ char name[BLKTRACE_BDEV_SIZE]; /* output */
+ __u16 act_mask; /* input */
+ __u32 buf_size; /* input */
+ __u32 buf_nr; /* input */
+ __u64 start_lba;
+ __u64 end_lba;
+ __u32 pid;
+};
+
+#ifdef __KERNEL__
+#if defined(CONFIG_BLK_DEV_IO_TRACE)
struct blk_trace {
int trace_state;
struct rchan *rchan;
atomic_t dropped;
};
-/*
- * User setup structure passed with BLKTRACESTART
- */
-struct blk_user_trace_setup {
- char name[BDEVNAME_SIZE]; /* output */
- u16 act_mask; /* input */
- u32 buf_size; /* input */
- u32 buf_nr; /* input */
- u64 start_lba;
- u64 end_lba;
- u32 pid;
-};
-
-#ifdef __KERNEL__
-#if defined(CONFIG_BLK_DEV_IO_TRACE)
extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
extern void blk_trace_shutdown(struct request_queue *);
extern void __blk_add_trace(struct blk_trace *, sector_t, int, int, u32, int, int, void *);
if (likely(!bt))
return;
+ if (blk_discard_rq(rq))
+ rw |= (1 << BIO_RW_DISCARD);
+
if (blk_pc_request(rq)) {
what |= BLK_TC_ACT(BLK_TC_PC);
__blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, sizeof(rq->cmd), rq->cmd);
struct class_private *p;
};
+struct class_dev_iter {
+ struct klist_iter ki;
+ const struct device_type *type;
+};
+
extern struct kobject *sysfs_dev_block_kobj;
extern struct kobject *sysfs_dev_char_kobj;
extern int __must_check __class_register(struct class *class,
__class_register(class, &__key); \
})
+extern void class_dev_iter_init(struct class_dev_iter *iter,
+ struct class *class,
+ struct device *start,
+ const struct device_type *type);
+extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
+extern void class_dev_iter_exit(struct class_dev_iter *iter);
+
extern int class_for_each_device(struct class *class, struct device *start,
void *data,
int (*fn)(struct device *dev, void *data));
spinlock_t devres_lock;
struct list_head devres_head;
- struct list_head node;
+ struct klist_node knode_class;
struct class *class;
dev_t devt; /* dev_t, creates the sysfs "dev" */
struct attribute_group **groups; /* optional groups */
extern int elv_register_queue(struct request_queue *q);
extern void elv_unregister_queue(struct request_queue *q);
extern int elv_may_queue(struct request_queue *, int);
+extern void elv_abort_queue(struct request_queue *);
extern void elv_completed_request(struct request_queue *, struct request *);
extern int elv_set_request(struct request_queue *, struct request *, gfp_t);
extern void elv_put_request(struct request_queue *, struct request *);
#define rb_entry_rq(node) rb_entry((node), struct request, rb_node)
/*
- * Hack to reuse the donelist list_head as the fifo time holder while
+ * Hack to reuse the csd.list list_head as the fifo time holder while
* the request is in the io scheduler. Saves an unsigned long in rq.
*/
-#define rq_fifo_time(rq) ((unsigned long) (rq)->donelist.next)
-#define rq_set_fifo_time(rq,exp) ((rq)->donelist.next = (void *) (exp))
+#define rq_fifo_time(rq) ((unsigned long) (rq)->csd.list.next)
+#define rq_set_fifo_time(rq,exp) ((rq)->csd.list.next = (void *) (exp))
#define rq_entry_fifo(ptr) list_entry((ptr), struct request, queuelist)
#define rq_fifo_clear(rq) do { \
list_del_init(&(rq)->queuelist); \
- INIT_LIST_HEAD(&(rq)->donelist); \
+ INIT_LIST_HEAD(&(rq)->csd.list); \
} while (0)
/*
sect, /* sectors per track */
head, /* nr of heads */
track, /* nr of tracks */
- stretch; /* !=0 means double track steps */
+ stretch; /* bit 0 !=0 means double track steps */
+ /* bit 1 != 0 means swap sides */
+ /* bits 2..9 give the first sector */
+ /* number (the LSB is flipped) */
#define FD_STRETCH 1
#define FD_SWAPSIDES 2
#define FD_ZEROBASED 4
+#define FD_SECTBASEMASK 0x3FC
+#define FD_MKSECTBASE(s) (((s) ^ 1) << 2)
+#define FD_SECTBASE(floppy) ((((floppy)->stretch & FD_SECTBASEMASK) >> 2) ^ 1)
unsigned char gap, /* gap1 size */
#define READ_META (READ | (1 << BIO_RW_META))
#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
#define SWRITE_SYNC (SWRITE | (1 << BIO_RW_SYNC))
-#define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
+#define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER))
+#define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD)
+#define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER))
#define SEL_IN 1
#define SEL_OUT 2
#define BLKTRACESTART _IO(0x12,116)
#define BLKTRACESTOP _IO(0x12,117)
#define BLKTRACETEARDOWN _IO(0x12,118)
+#define BLKDISCARD _IO(0x12,119)
#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
#define FIBMAP _IO(0x00,1) /* bmap access */
/* fs/block_dev.c */
#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
+#define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
#ifdef CONFIG_BLOCK
#define BLKDEV_MAJOR_HASH_SIZE 255
*/
#define bio_data_dir(bio) ((bio)->bi_rw & 1)
+extern void check_disk_size_change(struct gendisk *disk,
+ struct block_device *bdev);
+extern int revalidate_disk(struct gendisk *);
extern int check_disk_change(struct block_device *);
extern int __invalidate_device(struct block_device *);
extern int invalidate_partition(struct gendisk *, int);
#include <linux/types.h>
#include <linux/kdev_t.h>
+#include <linux/rcupdate.h>
#ifdef CONFIG_BLOCK
-#define kobj_to_dev(k) container_of(k, struct device, kobj)
-#define dev_to_disk(device) container_of(device, struct gendisk, dev)
-#define dev_to_part(device) container_of(device, struct hd_struct, dev)
+#define kobj_to_dev(k) container_of((k), struct device, kobj)
+#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
+#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
+#define disk_to_dev(disk) (&(disk)->part0.__dev)
+#define part_to_dev(part) (&((part)->__dev))
extern struct device_type part_type;
extern struct kobject *block_depr;
UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
};
+#define DISK_MAX_PARTS 256
+#define DISK_NAME_LEN 32
+
#include <linux/major.h>
#include <linux/device.h>
#include <linux/smp.h>
struct hd_struct {
sector_t start_sect;
sector_t nr_sects;
- struct device dev;
+ struct device __dev;
struct kobject *holder_dir;
int policy, partno;
#ifdef CONFIG_FAIL_MAKE_REQUEST
#else
struct disk_stats dkstats;
#endif
+ struct rcu_head rcu_head;
};
#define GENHD_FL_REMOVABLE 1
#define GENHD_FL_CD 8
#define GENHD_FL_UP 16
#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
-#define GENHD_FL_FAIL 64
+#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
+
+#define BLK_SCSI_MAX_CMDS (256)
+#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
+
+struct blk_scsi_cmd_filter {
+ unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
+ unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
+ struct kobject kobj;
+};
+
+struct disk_part_tbl {
+ struct rcu_head rcu_head;
+ int len;
+ struct hd_struct *part[];
+};
struct gendisk {
+ /* major, first_minor and minors are input parameters only,
+ * don't use directly. Use disk_devt() and disk_max_parts().
+ */
int major; /* major number of driver */
int first_minor;
int minors; /* maximum number of minors, =1 for
* disks that can't be partitioned. */
- char disk_name[32]; /* name of major driver */
- struct hd_struct **part; /* [indexed by minor] */
+
+ char disk_name[DISK_NAME_LEN]; /* name of major driver */
+
+ /* Array of pointers to partitions indexed by partno.
+ * Protected with matching bdev lock but stat and other
+ * non-critical accesses use RCU. Always access through
+ * helpers.
+ */
+ struct disk_part_tbl *part_tbl;
+ struct hd_struct part0;
+
struct block_device_operations *fops;
struct request_queue *queue;
void *private_data;
- sector_t capacity;
int flags;
struct device *driverfs_dev; // FIXME: remove
- struct device dev;
- struct kobject *holder_dir;
struct kobject *slave_dir;
struct timer_rand_state *random;
- int policy;
atomic_t sync_io; /* RAID */
- unsigned long stamp;
- int in_flight;
-#ifdef CONFIG_SMP
- struct disk_stats *dkstats;
-#else
- struct disk_stats dkstats;
-#endif
struct work_struct async_notify;
#ifdef CONFIG_BLK_DEV_INTEGRITY
struct blk_integrity *integrity;
#endif
+ int node_id;
};
-/*
- * Macros to operate on percpu disk statistics:
- *
- * The __ variants should only be called in critical sections. The full
- * variants disable/enable preemption.
- */
-static inline struct hd_struct *get_part(struct gendisk *gendiskp,
- sector_t sector)
+static inline struct gendisk *part_to_disk(struct hd_struct *part)
{
- struct hd_struct *part;
- int i;
- for (i = 0; i < gendiskp->minors - 1; i++) {
- part = gendiskp->part[i];
- if (part && part->start_sect <= sector
- && sector < part->start_sect + part->nr_sects)
- return part;
+ if (likely(part)) {
+ if (part->partno)
+ return dev_to_disk(part_to_dev(part)->parent);
+ else
+ return dev_to_disk(part_to_dev(part));
}
return NULL;
}
-#ifdef CONFIG_SMP
-#define __disk_stat_add(gendiskp, field, addnd) \
- (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
+static inline int disk_max_parts(struct gendisk *disk)
+{
+ if (disk->flags & GENHD_FL_EXT_DEVT)
+ return DISK_MAX_PARTS;
+ return disk->minors;
+}
-#define disk_stat_read(gendiskp, field) \
-({ \
- typeof(gendiskp->dkstats->field) res = 0; \
- int i; \
- for_each_possible_cpu(i) \
- res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
- res; \
-})
+static inline bool disk_partitionable(struct gendisk *disk)
+{
+ return disk_max_parts(disk) > 1;
+}
-static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
- int i;
+static inline dev_t disk_devt(struct gendisk *disk)
+{
+ return disk_to_dev(disk)->devt;
+}
- for_each_possible_cpu(i)
- memset(per_cpu_ptr(gendiskp->dkstats, i), value,
- sizeof(struct disk_stats));
-}
+static inline dev_t part_devt(struct hd_struct *part)
+{
+ return part_to_dev(part)->devt;
+}
-#define __part_stat_add(part, field, addnd) \
- (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
+extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
-#define __all_stat_add(gendiskp, part, field, addnd, sector) \
-({ \
- if (part) \
- __part_stat_add(part, field, addnd); \
- __disk_stat_add(gendiskp, field, addnd); \
-})
+static inline void disk_put_part(struct hd_struct *part)
+{
+ if (likely(part))
+ put_device(part_to_dev(part));
+}
+
+/*
+ * Smarter partition iterator without context limits.
+ */
+#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
+#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
+#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
+
+struct disk_part_iter {
+ struct gendisk *disk;
+ struct hd_struct *part;
+ int idx;
+ unsigned int flags;
+};
+
+extern void disk_part_iter_init(struct disk_part_iter *piter,
+ struct gendisk *disk, unsigned int flags);
+extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
+extern void disk_part_iter_exit(struct disk_part_iter *piter);
+
+extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
+ sector_t sector);
+
+/*
+ * Macros to operate on percpu disk statistics:
+ *
+ * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
+ * and should be called between disk_stat_lock() and
+ * disk_stat_unlock().
+ *
+ * part_stat_read() can be called at any time.
+ *
+ * part_stat_{add|set_all}() and {init|free}_part_stats are for
+ * internal use only.
+ */
+#ifdef CONFIG_SMP
+#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
+#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
+
+#define __part_stat_add(cpu, part, field, addnd) \
+ (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
#define part_stat_read(part, field) \
({ \
- typeof(part->dkstats->field) res = 0; \
+ typeof((part)->dkstats->field) res = 0; \
int i; \
for_each_possible_cpu(i) \
- res += per_cpu_ptr(part->dkstats, i)->field; \
+ res += per_cpu_ptr((part)->dkstats, i)->field; \
res; \
})
memset(per_cpu_ptr(part->dkstats, i), value,
sizeof(struct disk_stats));
}
-
-#else /* !CONFIG_SMP */
-#define __disk_stat_add(gendiskp, field, addnd) \
- (gendiskp->dkstats.field += addnd)
-#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
-static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
+static inline int init_part_stats(struct hd_struct *part)
{
- memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
+ part->dkstats = alloc_percpu(struct disk_stats);
+ if (!part->dkstats)
+ return 0;
+ return 1;
}
-#define __part_stat_add(part, field, addnd) \
- (part->dkstats.field += addnd)
-
-#define __all_stat_add(gendiskp, part, field, addnd, sector) \
-({ \
- if (part) \
- part->dkstats.field += addnd; \
- __disk_stat_add(gendiskp, field, addnd); \
-})
-
-#define part_stat_read(part, field) (part->dkstats.field)
-
-static inline void part_stat_set_all(struct hd_struct *part, int value)
+static inline void free_part_stats(struct hd_struct *part)
{
- memset(&part->dkstats, value, sizeof(struct disk_stats));
+ free_percpu(part->dkstats);
}
-#endif /* CONFIG_SMP */
+#else /* !CONFIG_SMP */
+#define part_stat_lock() ({ rcu_read_lock(); 0; })
+#define part_stat_unlock() rcu_read_unlock()
-#define disk_stat_add(gendiskp, field, addnd) \
- do { \
- preempt_disable(); \
- __disk_stat_add(gendiskp, field, addnd); \
- preempt_enable(); \
- } while (0)
-
-#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
-#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
-
-#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
-#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
-
-#define __disk_stat_sub(gendiskp, field, subnd) \
- __disk_stat_add(gendiskp, field, -subnd)
-#define disk_stat_sub(gendiskp, field, subnd) \
- disk_stat_add(gendiskp, field, -subnd)
-
-#define part_stat_add(gendiskp, field, addnd) \
- do { \
- preempt_disable(); \
- __part_stat_add(gendiskp, field, addnd);\
- preempt_enable(); \
- } while (0)
-
-#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
-#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
-
-#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
-#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
-
-#define __part_stat_sub(gendiskp, field, subnd) \
- __part_stat_add(gendiskp, field, -subnd)
-#define part_stat_sub(gendiskp, field, subnd) \
- part_stat_add(gendiskp, field, -subnd)
-
-#define all_stat_add(gendiskp, part, field, addnd, sector) \
- do { \
- preempt_disable(); \
- __all_stat_add(gendiskp, part, field, addnd, sector); \
- preempt_enable(); \
- } while (0)
-
-#define __all_stat_dec(gendiskp, field, sector) \
- __all_stat_add(gendiskp, field, -1, sector)
-#define all_stat_dec(gendiskp, field, sector) \
- all_stat_add(gendiskp, field, -1, sector)
-
-#define __all_stat_inc(gendiskp, part, field, sector) \
- __all_stat_add(gendiskp, part, field, 1, sector)
-#define all_stat_inc(gendiskp, part, field, sector) \
- all_stat_add(gendiskp, part, field, 1, sector)
-
-#define __all_stat_sub(gendiskp, part, field, subnd, sector) \
- __all_stat_add(gendiskp, part, field, -subnd, sector)
-#define all_stat_sub(gendiskp, part, field, subnd, sector) \
- all_stat_add(gendiskp, part, field, -subnd, sector)
-
-/* Inlines to alloc and free disk stats in struct gendisk */
-#ifdef CONFIG_SMP
-static inline int init_disk_stats(struct gendisk *disk)
-{
- disk->dkstats = alloc_percpu(struct disk_stats);
- if (!disk->dkstats)
- return 0;
- return 1;
-}
+#define __part_stat_add(cpu, part, field, addnd) \
+ ((part)->dkstats.field += addnd)
+
+#define part_stat_read(part, field) ((part)->dkstats.field)
-static inline void free_disk_stats(struct gendisk *disk)
+static inline void part_stat_set_all(struct hd_struct *part, int value)
{
- free_percpu(disk->dkstats);
+ memset(&part->dkstats, value, sizeof(struct disk_stats));
}
static inline int init_part_stats(struct hd_struct *part)
{
- part->dkstats = alloc_percpu(struct disk_stats);
- if (!part->dkstats)
- return 0;
return 1;
}
static inline void free_part_stats(struct hd_struct *part)
{
- free_percpu(part->dkstats);
-}
-
-#else /* CONFIG_SMP */
-static inline int init_disk_stats(struct gendisk *disk)
-{
- return 1;
}
-static inline void free_disk_stats(struct gendisk *disk)
-{
-}
+#endif /* CONFIG_SMP */
-static inline int init_part_stats(struct hd_struct *part)
+#define part_stat_add(cpu, part, field, addnd) do { \
+ __part_stat_add((cpu), (part), field, addnd); \
+ if ((part)->partno) \
+ __part_stat_add((cpu), &part_to_disk((part))->part0, \
+ field, addnd); \
+} while (0)
+
+#define part_stat_dec(cpu, gendiskp, field) \
+ part_stat_add(cpu, gendiskp, field, -1)
+#define part_stat_inc(cpu, gendiskp, field) \
+ part_stat_add(cpu, gendiskp, field, 1)
+#define part_stat_sub(cpu, gendiskp, field, subnd) \
+ part_stat_add(cpu, gendiskp, field, -subnd)
+
+static inline void part_inc_in_flight(struct hd_struct *part)
{
- return 1;
+ part->in_flight++;
+ if (part->partno)
+ part_to_disk(part)->part0.in_flight++;
}
-static inline void free_part_stats(struct hd_struct *part)
+static inline void part_dec_in_flight(struct hd_struct *part)
{
+ part->in_flight--;
+ if (part->partno)
+ part_to_disk(part)->part0.in_flight--;
}
-#endif /* CONFIG_SMP */
/* drivers/block/ll_rw_blk.c */
-extern void disk_round_stats(struct gendisk *disk);
-extern void part_round_stats(struct hd_struct *part);
+extern void part_round_stats(int cpu, struct hd_struct *part);
/* drivers/block/genhd.c */
extern int get_blkdev_list(char *, int);
extern void add_disk(struct gendisk *disk);
extern void del_gendisk(struct gendisk *gp);
extern void unlink_gendisk(struct gendisk *gp);
-extern struct gendisk *get_gendisk(dev_t dev, int *part);
+extern struct gendisk *get_gendisk(dev_t dev, int *partno);
+extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
extern void set_device_ro(struct block_device *bdev, int flag);
extern void set_disk_ro(struct gendisk *disk, int flag);
+static inline int get_disk_ro(struct gendisk *disk)
+{
+ return disk->part0.policy;
+}
+
/* drivers/char/random.c */
extern void add_disk_randomness(struct gendisk *disk);
extern void rand_initialize_disk(struct gendisk *disk);
static inline sector_t get_start_sect(struct block_device *bdev)
{
- return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
+ return bdev->bd_part->start_sect;
}
static inline sector_t get_capacity(struct gendisk *disk)
{
- return disk->capacity;
+ return disk->part0.nr_sects;
}
static inline void set_capacity(struct gendisk *disk, sector_t size)
{
- disk->capacity = size;
+ disk->part0.nr_sects = size;
}
#ifdef CONFIG_SOLARIS_X86_PARTITION
#define ADDPART_FLAG_RAID 1
#define ADDPART_FLAG_WHOLEDISK 2
-extern dev_t blk_lookup_devt(const char *name, int part);
-extern char *disk_name (struct gendisk *hd, int part, char *buf);
+extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
+extern void blk_free_devt(dev_t devt);
+extern dev_t blk_lookup_devt(const char *name, int partno);
+extern char *disk_name (struct gendisk *hd, int partno, char *buf);
+extern int disk_expand_part_tbl(struct gendisk *disk, int target);
extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
extern void delete_partition(struct gendisk *, int);
void *data);
extern void blk_unregister_region(dev_t devt, unsigned long range);
-static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
-{
- return bdget(MKDEV(disk->major, disk->first_minor) + index);
-}
+extern ssize_t part_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf);
+extern ssize_t part_stat_show(struct device *dev,
+ struct device_attribute *attr, char *buf);
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+extern ssize_t part_fail_show(struct device *dev,
+ struct device_attribute *attr, char *buf);
+extern ssize_t part_fail_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count);
+#endif /* CONFIG_FAIL_MAKE_REQUEST */
#else /* CONFIG_BLOCK */
static inline void printk_all_partitions(void) { }
-static inline dev_t blk_lookup_devt(const char *name, int part)
+static inline dev_t blk_lookup_devt(const char *name, int partno)
{
dev_t devt = MKDEV(0, 0);
return devt;
void (*put)(struct klist_node *));
struct klist_node {
- struct klist *n_klist;
+ void *n_klist; /* never access directly */
struct list_head n_node;
struct kref n_ref;
struct completion n_removed;
struct klist_iter {
struct klist *i_klist;
- struct list_head *i_head;
struct klist_node *i_cur;
};
#define VIOTAPE_MAJOR 230
+#define BLOCK_EXT_MAJOR 259
+
#endif
unsigned long block, char *buffer);
int (*writesect)(struct mtd_blktrans_dev *dev,
unsigned long block, char *buffer);
+ int (*discard)(struct mtd_blktrans_dev *dev,
+ unsigned long block, unsigned nr_blocks);
/* Block layer ioctls */
int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
int retries;
int allowed;
- int timeout_per_command;
unsigned char prot_op;
unsigned char prot_type;
/* These elements define the operation we are about to perform */
unsigned char *cmnd;
- struct timer_list eh_timeout; /* Used to time out the command. */
/* These elements define the operation we ultimately want to perform */
struct scsi_data_buffer sdb;
extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *,
struct device *);
extern void scsi_finish_command(struct scsi_cmnd *cmd);
-extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd);
extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
size_t *offset, size_t *len);
#define DISABLE_CLUSTERING 0
#define ENABLE_CLUSTERING 1
-enum scsi_eh_timer_return {
- EH_NOT_HANDLED,
- EH_HANDLED,
- EH_RESET_TIMER,
-};
-
-
struct scsi_host_template {
struct module *module;
const char *name;
*
* Status: OPTIONAL
*/
- enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
+ enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
/*
* Name of proc directory
#define SCSI_TRANSPORT_H
#include <linux/transport_class.h>
+#include <linux/blkdev.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
* begin counting again
* EH_NOT_HANDLED Begin normal error recovery
*/
- enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
+ enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
/*
* Used as callback for the completion of i_t_nexus request
printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
printk_all_partitions();
+#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
+ printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify "
+ "explicit textual name for \"root=\" boot option.\n");
+#endif
panic("VFS: Unable to mount root fs on %s", b);
}
Say N if you are unsure.
+config DEBUG_BLOCK_EXT_DEVT
+ bool "Force extended block device numbers and spread them"
+ depends on DEBUG_KERNEL
+ depends on BLOCK
+ default n
+ help
+ Conventionally, block device numbers are allocated from
+ predetermined contiguous area. However, extended block area
+ may introduce non-contiguous block device numbers. This
+ option forces most block device numbers to be allocated from
+ the extended space and spreads them to discover kernel or
+ userland code paths which assume predetermined contiguous
+ device number allocation.
+
+ Note that turning on this debug option shuffles all the
+ device numbers for all IDE and SCSI devices including libata
+ ones, so root partition specified using device number
+ directly (via rdev or root=MAJ:MIN) won't work anymore.
+ Textual device names (root=/dev/sdXn) will continue to work.
+
+ Say N if you are unsure.
+
config LKDTM
tristate "Linux Kernel Dump Test Tool Module"
depends on DEBUG_KERNEL
config FAIL_MAKE_REQUEST
bool "Fault-injection capability for disk IO"
- depends on FAULT_INJECTION
+ depends on FAULT_INJECTION && BLOCK
help
Provide fault-injection capability for disk IO.
+config FAIL_IO_TIMEOUT
+ bool "Faul-injection capability for faking disk interrupts"
+ depends on FAULT_INJECTION && BLOCK
+ help
+ Provide fault-injection capability on end IO handling. This
+ will make the block layer "forget" an interrupt as configured,
+ thus exercising the error handling.
+
+ Only works with drivers that use the generic timeout handling,
+ for others it wont do anything.
+
config FAULT_INJECTION_DEBUG_FS
bool "Debugfs entries for fault-injection capabilities"
depends on FAULT_INJECTION && SYSFS && DEBUG_FS
#include <linux/klist.h>
#include <linux/module.h>
+/*
+ * Use the lowest bit of n_klist to mark deleted nodes and exclude
+ * dead ones from iteration.
+ */
+#define KNODE_DEAD 1LU
+#define KNODE_KLIST_MASK ~KNODE_DEAD
+
+static struct klist *knode_klist(struct klist_node *knode)
+{
+ return (struct klist *)
+ ((unsigned long)knode->n_klist & KNODE_KLIST_MASK);
+}
+
+static bool knode_dead(struct klist_node *knode)
+{
+ return (unsigned long)knode->n_klist & KNODE_DEAD;
+}
+
+static void knode_set_klist(struct klist_node *knode, struct klist *klist)
+{
+ knode->n_klist = klist;
+ /* no knode deserves to start its life dead */
+ WARN_ON(knode_dead(knode));
+}
+
+static void knode_kill(struct klist_node *knode)
+{
+ /* and no knode should die twice ever either, see we're very humane */
+ WARN_ON(knode_dead(knode));
+ *(unsigned long *)&knode->n_klist |= KNODE_DEAD;
+}
/**
* klist_init - Initialize a klist structure.
INIT_LIST_HEAD(&n->n_node);
init_completion(&n->n_removed);
kref_init(&n->n_ref);
- n->n_klist = k;
+ knode_set_klist(n, k);
if (k->get)
k->get(n);
}
*/
void klist_add_after(struct klist_node *n, struct klist_node *pos)
{
- struct klist *k = pos->n_klist;
+ struct klist *k = knode_klist(pos);
klist_node_init(k, n);
spin_lock(&k->k_lock);
*/
void klist_add_before(struct klist_node *n, struct klist_node *pos)
{
- struct klist *k = pos->n_klist;
+ struct klist *k = knode_klist(pos);
klist_node_init(k, n);
spin_lock(&k->k_lock);
{
struct klist_node *n = container_of(kref, struct klist_node, n_ref);
+ WARN_ON(!knode_dead(n));
list_del(&n->n_node);
complete(&n->n_removed);
- n->n_klist = NULL;
+ knode_set_klist(n, NULL);
}
static int klist_dec_and_del(struct klist_node *n)
return kref_put(&n->n_ref, klist_release);
}
-/**
- * klist_del - Decrement the reference count of node and try to remove.
- * @n: node we're deleting.
- */
-void klist_del(struct klist_node *n)
+static void klist_put(struct klist_node *n, bool kill)
{
- struct klist *k = n->n_klist;
+ struct klist *k = knode_klist(n);
void (*put)(struct klist_node *) = k->put;
spin_lock(&k->k_lock);
+ if (kill)
+ knode_kill(n);
if (!klist_dec_and_del(n))
put = NULL;
spin_unlock(&k->k_lock);
if (put)
put(n);
}
+
+/**
+ * klist_del - Decrement the reference count of node and try to remove.
+ * @n: node we're deleting.
+ */
+void klist_del(struct klist_node *n)
+{
+ klist_put(n, true);
+}
EXPORT_SYMBOL_GPL(klist_del);
/**
struct klist_node *n)
{
i->i_klist = k;
- i->i_head = &k->k_list;
i->i_cur = n;
if (n)
kref_get(&n->n_ref);
void klist_iter_exit(struct klist_iter *i)
{
if (i->i_cur) {
- klist_del(i->i_cur);
+ klist_put(i->i_cur, false);
i->i_cur = NULL;
}
}
*/
struct klist_node *klist_next(struct klist_iter *i)
{
- struct list_head *next;
- struct klist_node *lnode = i->i_cur;
- struct klist_node *knode = NULL;
void (*put)(struct klist_node *) = i->i_klist->put;
+ struct klist_node *last = i->i_cur;
+ struct klist_node *next;
spin_lock(&i->i_klist->k_lock);
- if (lnode) {
- next = lnode->n_node.next;
- if (!klist_dec_and_del(lnode))
+
+ if (last) {
+ next = to_klist_node(last->n_node.next);
+ if (!klist_dec_and_del(last))
put = NULL;
} else
- next = i->i_head->next;
+ next = to_klist_node(i->i_klist->k_list.next);
- if (next != i->i_head) {
- knode = to_klist_node(next);
- kref_get(&knode->n_ref);
+ i->i_cur = NULL;
+ while (next != to_klist_node(&i->i_klist->k_list)) {
+ if (likely(!knode_dead(next))) {
+ kref_get(&next->n_ref);
+ i->i_cur = next;
+ break;
+ }
+ next = to_klist_node(next->n_node.next);
}
- i->i_cur = knode;
+
spin_unlock(&i->i_klist->k_lock);
- if (put && lnode)
- put(lnode);
- return knode;
+
+ if (put && last)
+ put(last);
+ return i->i_cur;
}
EXPORT_SYMBOL_GPL(klist_next);
/*
* Data-less bio, nothing to bounce
*/
- if (bio_empty_barrier(*bio_orig))
+ if (!bio_has_data(*bio_orig))
return;
/*
projects / linux-2.6-omap-h63xx.git / commitdiff