2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define DRV_NAME "ide-tape"
20 #define IDETAPE_VERSION "1.20"
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/string.h>
25 #include <linux/kernel.h>
26 #include <linux/delay.h>
27 #include <linux/timer.h>
29 #include <linux/interrupt.h>
30 #include <linux/jiffies.h>
31 #include <linux/major.h>
32 #include <linux/errno.h>
33 #include <linux/genhd.h>
34 #include <linux/slab.h>
35 #include <linux/pci.h>
36 #include <linux/ide.h>
37 #include <linux/smp_lock.h>
38 #include <linux/completion.h>
39 #include <linux/bitops.h>
40 #include <linux/mutex.h>
41 #include <scsi/scsi.h>
43 #include <asm/byteorder.h>
44 #include <linux/irq.h>
45 #include <linux/uaccess.h>
47 #include <asm/unaligned.h>
48 #include <linux/mtio.h>
51 /* output errors only */
53 /* output all sense key/asc */
55 /* info regarding all chrdev-related procedures */
56 DBG_CHRDEV = (1 << 2),
57 /* all remaining procedures */
61 /* define to see debug info */
62 #define IDETAPE_DEBUG_LOG 0
65 #define debug_log(lvl, fmt, args...) \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
71 #define debug_log(lvl, fmt, args...) do {} while (0)
74 /**************************** Tunable parameters *****************************/
76 * After each failed packet command we issue a request sense command and retry
77 * the packet command IDETAPE_MAX_PC_RETRIES times.
79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
81 #define IDETAPE_MAX_PC_RETRIES 3
84 * The following parameter is used to select the point in the internal tape fifo
85 * in which we will start to refill the buffer. Decreasing the following
86 * parameter will improve the system's latency and interactive response, while
87 * using a high value might improve system throughput.
89 #define IDETAPE_FIFO_THRESHOLD 2
92 * DSC polling parameters.
94 * Polling for DSC (a single bit in the status register) is a very important
95 * function in ide-tape. There are two cases in which we poll for DSC:
97 * 1. Before a read/write packet command, to ensure that we can transfer data
98 * from/to the tape's data buffers, without causing an actual media access.
99 * In case the tape is not ready yet, we take out our request from the device
100 * request queue, so that ide.c could service requests from the other device
101 * on the same interface in the meantime.
103 * 2. After the successful initialization of a "media access packet command",
104 * which is a command that can take a long time to complete (the interval can
105 * range from several seconds to even an hour). Again, we postpone our request
106 * in the middle to free the bus for the other device. The polling frequency
107 * here should be lower than the read/write frequency since those media access
108 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
109 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
110 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
112 * We also set a timeout for the timer, in case something goes wrong. The
113 * timeout should be longer then the maximum execution time of a tape operation.
117 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
118 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
119 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
120 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
121 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
122 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
123 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
125 /*************************** End of tunable parameters ***********************/
127 /* tape directions */
129 IDETAPE_DIR_NONE = (1 << 0),
130 IDETAPE_DIR_READ = (1 << 1),
131 IDETAPE_DIR_WRITE = (1 << 2),
137 struct idetape_bh *b_reqnext;
141 /* Tape door status */
142 #define DOOR_UNLOCKED 0
143 #define DOOR_LOCKED 1
144 #define DOOR_EXPLICITLY_LOCKED 2
146 /* Some defines for the SPACE command */
147 #define IDETAPE_SPACE_OVER_FILEMARK 1
148 #define IDETAPE_SPACE_TO_EOD 3
150 /* Some defines for the LOAD UNLOAD command */
151 #define IDETAPE_LU_LOAD_MASK 1
152 #define IDETAPE_LU_RETENSION_MASK 2
153 #define IDETAPE_LU_EOT_MASK 4
155 /* Error codes returned in rq->errors to the higher part of the driver. */
156 #define IDETAPE_ERROR_GENERAL 101
157 #define IDETAPE_ERROR_FILEMARK 102
158 #define IDETAPE_ERROR_EOD 103
160 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
161 #define IDETAPE_BLOCK_DESCRIPTOR 0
162 #define IDETAPE_CAPABILITIES_PAGE 0x2a
165 * Most of our global data which we need to save even as we leave the driver due
166 * to an interrupt or a timer event is stored in the struct defined below.
168 typedef struct ide_tape_obj {
170 ide_driver_t *driver;
171 struct gendisk *disk;
175 * failed_pc points to the last failed packet command, or contains
176 * NULL if we do not need to retry any packet command. This is
177 * required since an additional packet command is needed before the
178 * retry, to get detailed information on what went wrong.
180 /* Last failed packet command */
181 struct ide_atapi_pc *failed_pc;
182 /* used by REQ_IDETAPE_{READ,WRITE} requests */
183 struct ide_atapi_pc queued_pc;
185 struct ide_atapi_pc request_sense_pc;
186 struct request request_sense_rq;
189 * DSC polling variables.
191 * While polling for DSC we use postponed_rq to postpone the current
192 * request so that ide.c will be able to service pending requests on the
193 * other device. Note that at most we will have only one DSC (usually
194 * data transfer) request in the device request queue.
196 struct request *postponed_rq;
197 /* The time in which we started polling for DSC */
198 unsigned long dsc_polling_start;
199 /* Timer used to poll for dsc */
200 struct timer_list dsc_timer;
201 /* Read/Write dsc polling frequency */
202 unsigned long best_dsc_rw_freq;
203 unsigned long dsc_poll_freq;
204 unsigned long dsc_timeout;
206 /* Read position information */
209 unsigned int first_frame;
211 /* Last error information */
212 u8 sense_key, asc, ascq;
214 /* Character device operation */
218 /* Current character device data transfer direction */
221 /* tape block size, usually 512 or 1024 bytes */
222 unsigned short blk_size;
225 /* Copy of the tape's Capabilities and Mechanical Page */
229 * Active data transfer request parameters.
231 * At most, there is only one ide-tape originated data transfer request
232 * in the device request queue. This allows ide.c to easily service
233 * requests from the other device when we postpone our active request.
236 /* Data buffer size chosen based on the tape's recommendation */
239 struct idetape_bh *merge_bh;
240 /* size of the merge buffer */
242 /* pointer to current buffer head within the merge buffer */
243 struct idetape_bh *bh;
247 int pages_per_buffer;
248 /* Wasted space in each stage */
251 /* protects the ide-tape queue */
254 /* Measures average tape speed */
255 unsigned long avg_time;
259 /* the door is currently locked */
261 /* the tape hardware is write protected */
263 /* the tape is write protected (hardware or opened as read-only) */
269 static DEFINE_MUTEX(idetape_ref_mutex);
271 static struct class *idetape_sysfs_class;
273 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
275 #define ide_tape_g(disk) \
276 container_of((disk)->private_data, struct ide_tape_obj, driver)
278 static void ide_tape_release(struct kref *);
280 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
282 struct ide_tape_obj *tape = NULL;
284 mutex_lock(&idetape_ref_mutex);
285 tape = ide_tape_g(disk);
287 if (ide_device_get(tape->drive))
290 kref_get(&tape->kref);
292 mutex_unlock(&idetape_ref_mutex);
296 static void ide_tape_put(struct ide_tape_obj *tape)
298 ide_drive_t *drive = tape->drive;
300 mutex_lock(&idetape_ref_mutex);
301 kref_put(&tape->kref, ide_tape_release);
302 ide_device_put(drive);
303 mutex_unlock(&idetape_ref_mutex);
307 * The variables below are used for the character device interface. Additional
308 * state variables are defined in our ide_drive_t structure.
310 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
312 #define ide_tape_f(file) ((file)->private_data)
314 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
316 struct ide_tape_obj *tape = NULL;
318 mutex_lock(&idetape_ref_mutex);
319 tape = idetape_devs[i];
321 kref_get(&tape->kref);
322 mutex_unlock(&idetape_ref_mutex);
326 static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
329 struct idetape_bh *bh = pc->bh;
334 printk(KERN_ERR "ide-tape: bh == NULL in "
335 "idetape_input_buffers\n");
336 ide_pad_transfer(drive, 0, bcount);
340 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
342 drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data +
343 atomic_read(&bh->b_count), count);
345 atomic_add(count, &bh->b_count);
346 if (atomic_read(&bh->b_count) == bh->b_size) {
349 atomic_set(&bh->b_count, 0);
355 static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
358 struct idetape_bh *bh = pc->bh;
363 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
367 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
368 drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count);
371 pc->b_count -= count;
376 pc->b_data = bh->b_data;
377 pc->b_count = atomic_read(&bh->b_count);
383 static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
385 struct idetape_bh *bh = pc->bh;
387 unsigned int bcount = pc->xferred;
389 if (pc->flags & PC_FLAG_WRITING)
393 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
397 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
398 atomic_set(&bh->b_count, count);
399 if (atomic_read(&bh->b_count) == bh->b_size)
407 * called on each failed packet command retry to analyze the request sense. We
408 * currently do not utilize this information.
410 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
412 idetape_tape_t *tape = drive->driver_data;
413 struct ide_atapi_pc *pc = tape->failed_pc;
415 tape->sense_key = sense[2] & 0xF;
416 tape->asc = sense[12];
417 tape->ascq = sense[13];
419 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
420 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
422 /* Correct pc->xferred by asking the tape. */
423 if (pc->flags & PC_FLAG_DMA_ERROR) {
424 pc->xferred = pc->req_xfer -
426 get_unaligned_be32(&sense[3]);
427 idetape_update_buffers(drive, pc);
431 * If error was the result of a zero-length read or write command,
432 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
433 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
435 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
437 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
438 if (tape->sense_key == 5) {
439 /* don't report an error, everything's ok */
441 /* don't retry read/write */
442 pc->flags |= PC_FLAG_ABORT;
445 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
446 pc->error = IDETAPE_ERROR_FILEMARK;
447 pc->flags |= PC_FLAG_ABORT;
449 if (pc->c[0] == WRITE_6) {
450 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
451 && tape->asc == 0x0 && tape->ascq == 0x2)) {
452 pc->error = IDETAPE_ERROR_EOD;
453 pc->flags |= PC_FLAG_ABORT;
456 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
457 if (tape->sense_key == 8) {
458 pc->error = IDETAPE_ERROR_EOD;
459 pc->flags |= PC_FLAG_ABORT;
461 if (!(pc->flags & PC_FLAG_ABORT) &&
463 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
467 /* Free data buffers completely. */
468 static void ide_tape_kfree_buffer(idetape_tape_t *tape)
470 struct idetape_bh *prev_bh, *bh = tape->merge_bh;
473 u32 size = bh->b_size;
476 unsigned int order = fls(size >> PAGE_SHIFT)-1;
479 free_pages((unsigned long)bh->b_data, order);
482 bh->b_data += (1 << order) * PAGE_SIZE;
490 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
492 struct request *rq = HWGROUP(drive)->rq;
493 idetape_tape_t *tape = drive->driver_data;
497 debug_log(DBG_PROCS, "Enter %s\n", __func__);
500 case 0: error = IDETAPE_ERROR_GENERAL; break;
501 case 1: error = 0; break;
502 default: error = uptodate;
506 tape->failed_pc = NULL;
508 if (!blk_special_request(rq)) {
509 ide_end_request(drive, uptodate, nr_sects);
513 spin_lock_irqsave(&tape->lock, flags);
515 ide_end_drive_cmd(drive, 0, 0);
517 spin_unlock_irqrestore(&tape->lock, flags);
521 static void ide_tape_handle_dsc(ide_drive_t *);
523 static void ide_tape_callback(ide_drive_t *drive, int dsc)
525 idetape_tape_t *tape = drive->driver_data;
526 struct ide_atapi_pc *pc = drive->pc;
527 int uptodate = pc->error ? 0 : 1;
529 debug_log(DBG_PROCS, "Enter %s\n", __func__);
532 ide_tape_handle_dsc(drive);
534 if (tape->failed_pc == pc)
535 tape->failed_pc = NULL;
537 if (pc->c[0] == REQUEST_SENSE) {
539 idetape_analyze_error(drive, pc->buf);
541 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
542 "itself - Aborting request!\n");
543 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
544 struct request *rq = drive->hwif->hwgroup->rq;
545 int blocks = pc->xferred / tape->blk_size;
547 tape->avg_size += blocks * tape->blk_size;
549 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
550 tape->avg_speed = tape->avg_size * HZ /
551 (jiffies - tape->avg_time) / 1024;
553 tape->avg_time = jiffies;
556 tape->first_frame += blocks;
557 rq->current_nr_sectors -= blocks;
560 uptodate = pc->error;
561 } else if (pc->c[0] == READ_POSITION && uptodate) {
562 u8 *readpos = pc->buf;
564 debug_log(DBG_SENSE, "BOP - %s\n",
565 (readpos[0] & 0x80) ? "Yes" : "No");
566 debug_log(DBG_SENSE, "EOP - %s\n",
567 (readpos[0] & 0x40) ? "Yes" : "No");
569 if (readpos[0] & 0x4) {
570 printk(KERN_INFO "ide-tape: Block location is unknown"
572 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
575 debug_log(DBG_SENSE, "Block Location - %u\n",
576 be32_to_cpup((__be32 *)&readpos[4]));
578 tape->partition = readpos[1];
579 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
580 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
584 idetape_end_request(drive, uptodate, 0);
587 static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
590 pc->c[0] = REQUEST_SENSE;
596 * idetape_retry_pc is called when an error was detected during the
597 * last packet command. We queue a request sense packet command in
598 * the head of the request list.
600 static void idetape_retry_pc(ide_drive_t *drive)
602 struct ide_tape_obj *tape = drive->driver_data;
603 struct request *rq = &tape->request_sense_rq;
604 struct ide_atapi_pc *pc = &tape->request_sense_pc;
606 (void)ide_read_error(drive);
607 idetape_create_request_sense_cmd(pc);
608 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
609 ide_queue_pc_head(drive, tape->disk, pc, rq);
613 * Postpone the current request so that ide.c will be able to service requests
614 * from another device on the same hwgroup while we are polling for DSC.
616 static void idetape_postpone_request(ide_drive_t *drive)
618 idetape_tape_t *tape = drive->driver_data;
620 debug_log(DBG_PROCS, "Enter %s\n", __func__);
622 tape->postponed_rq = HWGROUP(drive)->rq;
623 ide_stall_queue(drive, tape->dsc_poll_freq);
626 static void ide_tape_handle_dsc(ide_drive_t *drive)
628 idetape_tape_t *tape = drive->driver_data;
630 /* Media access command */
631 tape->dsc_polling_start = jiffies;
632 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
633 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
634 /* Allow ide.c to handle other requests */
635 idetape_postpone_request(drive);
638 static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
639 unsigned int bcount, int write)
642 idetape_output_buffers(drive, pc, bcount);
644 idetape_input_buffers(drive, pc, bcount);
650 * This is the usual interrupt handler which will be called during a packet
651 * command. We will transfer some of the data (as requested by the drive) and
652 * will re-point interrupt handler to us. When data transfer is finished, we
653 * will act according to the algorithm described before
656 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
658 return ide_pc_intr(drive, idetape_pc_intr, WAIT_TAPE_CMD,
659 NULL, idetape_update_buffers, idetape_retry_pc,
660 ide_tape_io_buffers);
664 * Packet Command Interface
666 * The current Packet Command is available in drive->pc, and will not change
667 * until we finish handling it. Each packet command is associated with a
668 * callback function that will be called when the command is finished.
670 * The handling will be done in three stages:
672 * 1. idetape_issue_pc will send the packet command to the drive, and will set
673 * the interrupt handler to idetape_pc_intr.
675 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
676 * repeated until the device signals us that no more interrupts will be issued.
678 * 3. ATAPI Tape media access commands have immediate status with a delayed
679 * process. In case of a successful initiation of a media access packet command,
680 * the DSC bit will be set when the actual execution of the command is finished.
681 * Since the tape drive will not issue an interrupt, we have to poll for this
682 * event. In this case, we define the request as "low priority request" by
683 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
686 * ide.c will then give higher priority to requests which originate from the
687 * other device, until will change rq_status to RQ_ACTIVE.
689 * 4. When the packet command is finished, it will be checked for errors.
691 * 5. In case an error was found, we queue a request sense packet command in
692 * front of the request queue and retry the operation up to
693 * IDETAPE_MAX_PC_RETRIES times.
695 * 6. In case no error was found, or we decided to give up and not to retry
696 * again, the callback function will be called and then we will handle the next
699 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
701 return ide_transfer_pc(drive, idetape_pc_intr, WAIT_TAPE_CMD, NULL);
704 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
705 struct ide_atapi_pc *pc)
707 idetape_tape_t *tape = drive->driver_data;
709 if (drive->pc->c[0] == REQUEST_SENSE &&
710 pc->c[0] == REQUEST_SENSE) {
711 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
712 "Two request sense in serial were issued\n");
715 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
716 tape->failed_pc = pc;
718 /* Set the current packet command */
721 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
722 (pc->flags & PC_FLAG_ABORT)) {
724 * We will "abort" retrying a packet command in case legitimate
725 * error code was received (crossing a filemark, or end of the
726 * media, for example).
728 if (!(pc->flags & PC_FLAG_ABORT)) {
729 if (!(pc->c[0] == TEST_UNIT_READY &&
730 tape->sense_key == 2 && tape->asc == 4 &&
731 (tape->ascq == 1 || tape->ascq == 8))) {
732 printk(KERN_ERR "ide-tape: %s: I/O error, "
733 "pc = %2x, key = %2x, "
734 "asc = %2x, ascq = %2x\n",
735 tape->name, pc->c[0],
736 tape->sense_key, tape->asc,
740 pc->error = IDETAPE_ERROR_GENERAL;
742 tape->failed_pc = NULL;
743 drive->pc_callback(drive, 0);
746 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
750 return ide_issue_pc(drive, idetape_transfer_pc, WAIT_TAPE_CMD, NULL);
753 /* A mode sense command is used to "sense" tape parameters. */
754 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
757 pc->c[0] = MODE_SENSE;
758 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
759 /* DBD = 1 - Don't return block descriptors */
761 pc->c[2] = page_code;
763 * Changed pc->c[3] to 0 (255 will at best return unused info).
765 * For SCSI this byte is defined as subpage instead of high byte
766 * of length and some IDE drives seem to interpret it this way
767 * and return an error when 255 is used.
770 /* We will just discard data in that case */
772 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
774 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
780 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
782 ide_hwif_t *hwif = drive->hwif;
783 idetape_tape_t *tape = drive->driver_data;
784 struct ide_atapi_pc *pc = drive->pc;
787 stat = hwif->tp_ops->read_status(hwif);
789 if (stat & ATA_DSC) {
790 if (stat & ATA_ERR) {
792 if (pc->c[0] != TEST_UNIT_READY)
793 printk(KERN_ERR "ide-tape: %s: I/O error, ",
795 /* Retry operation */
796 idetape_retry_pc(drive);
801 pc->error = IDETAPE_ERROR_GENERAL;
802 tape->failed_pc = NULL;
804 drive->pc_callback(drive, 0);
808 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
809 struct ide_atapi_pc *pc, struct request *rq,
812 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
813 unsigned int length = rq->current_nr_sectors;
816 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
820 pc->buf_size = length * tape->blk_size;
821 pc->req_xfer = pc->buf_size;
822 if (pc->req_xfer == tape->buffer_size)
823 pc->flags |= PC_FLAG_DMA_OK;
825 if (opcode == READ_6) {
827 atomic_set(&bh->b_count, 0);
828 } else if (opcode == WRITE_6) {
830 pc->flags |= PC_FLAG_WRITING;
831 pc->b_data = bh->b_data;
832 pc->b_count = atomic_read(&bh->b_count);
835 memcpy(rq->cmd, pc->c, 12);
838 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
839 struct request *rq, sector_t block)
841 ide_hwif_t *hwif = drive->hwif;
842 idetape_tape_t *tape = drive->driver_data;
843 struct ide_atapi_pc *pc = NULL;
844 struct request *postponed_rq = tape->postponed_rq;
847 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
848 " current_nr_sectors: %u\n",
849 (unsigned long long)rq->sector, rq->nr_sectors,
850 rq->current_nr_sectors);
852 if (!blk_special_request(rq)) {
853 /* We do not support buffer cache originated requests. */
854 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
855 "request queue (%d)\n", drive->name, rq->cmd_type);
856 ide_end_request(drive, 0, 0);
860 /* Retry a failed packet command */
861 if (tape->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
862 pc = tape->failed_pc;
866 if (postponed_rq != NULL)
867 if (rq != postponed_rq) {
868 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
869 "Two DSC requests were queued\n");
870 idetape_end_request(drive, 0, 0);
874 tape->postponed_rq = NULL;
877 * If the tape is still busy, postpone our request and service
878 * the other device meanwhile.
880 stat = hwif->tp_ops->read_status(hwif);
882 if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2))
883 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
885 if (drive->post_reset == 1) {
886 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
887 drive->post_reset = 0;
890 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
891 (stat & ATA_DSC) == 0) {
892 if (postponed_rq == NULL) {
893 tape->dsc_polling_start = jiffies;
894 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
895 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
896 } else if (time_after(jiffies, tape->dsc_timeout)) {
897 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
899 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
900 idetape_media_access_finished(drive);
903 return ide_do_reset(drive);
905 } else if (time_after(jiffies,
906 tape->dsc_polling_start +
907 IDETAPE_DSC_MA_THRESHOLD))
908 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
909 idetape_postpone_request(drive);
912 if (rq->cmd[13] & REQ_IDETAPE_READ) {
913 pc = &tape->queued_pc;
914 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
917 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
918 pc = &tape->queued_pc;
919 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
922 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
923 pc = (struct ide_atapi_pc *) rq->buffer;
924 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
925 rq->cmd[13] |= REQ_IDETAPE_PC2;
928 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
929 idetape_media_access_finished(drive);
935 return idetape_issue_pc(drive, pc);
939 * The function below uses __get_free_pages to allocate a data buffer of size
940 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
943 * It returns a pointer to the newly allocated buffer, or NULL in case of
946 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
949 struct idetape_bh *prev_bh, *bh, *merge_bh;
950 int pages = tape->pages_per_buffer;
951 unsigned int order, b_allocd;
954 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
959 order = fls(pages) - 1;
960 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
963 b_allocd = (1 << order) * PAGE_SIZE;
967 memset(bh->b_data, 0, b_allocd);
968 bh->b_reqnext = NULL;
969 bh->b_size = b_allocd;
970 atomic_set(&bh->b_count, full ? bh->b_size : 0);
973 order = fls(pages) - 1;
974 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
977 b_allocd = (1 << order) * PAGE_SIZE;
980 memset(b_data, 0, b_allocd);
982 /* newly allocated page frames below buffer header or ...*/
983 if (bh->b_data == b_data + b_allocd) {
984 bh->b_size += b_allocd;
985 bh->b_data -= b_allocd;
987 atomic_add(b_allocd, &bh->b_count);
990 /* they are above the header */
991 if (b_data == bh->b_data + bh->b_size) {
992 bh->b_size += b_allocd;
994 atomic_add(b_allocd, &bh->b_count);
998 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1000 free_pages((unsigned long) b_data, order);
1003 bh->b_reqnext = NULL;
1004 bh->b_data = b_data;
1005 bh->b_size = b_allocd;
1006 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1007 prev_bh->b_reqnext = bh;
1012 bh->b_size -= tape->excess_bh_size;
1014 atomic_sub(tape->excess_bh_size, &bh->b_count);
1017 ide_tape_kfree_buffer(tape);
1021 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
1022 const char __user *buf, int n)
1024 struct idetape_bh *bh = tape->bh;
1030 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1034 count = min((unsigned int)
1035 (bh->b_size - atomic_read(&bh->b_count)),
1037 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1041 atomic_add(count, &bh->b_count);
1043 if (atomic_read(&bh->b_count) == bh->b_size) {
1046 atomic_set(&bh->b_count, 0);
1053 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
1056 struct idetape_bh *bh = tape->bh;
1062 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1066 count = min(tape->b_count, n);
1067 if (copy_to_user(buf, tape->b_data, count))
1070 tape->b_data += count;
1071 tape->b_count -= count;
1073 if (!tape->b_count) {
1077 tape->b_data = bh->b_data;
1078 tape->b_count = atomic_read(&bh->b_count);
1085 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1087 struct idetape_bh *bh = tape->merge_bh;
1088 tape->bh = tape->merge_bh;
1090 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1091 atomic_set(&bh->b_count, 0);
1093 tape->b_data = bh->b_data;
1094 tape->b_count = atomic_read(&bh->b_count);
1099 * Write a filemark if write_filemark=1. Flush the device buffers without
1100 * writing a filemark otherwise.
1102 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1103 struct ide_atapi_pc *pc, int write_filemark)
1106 pc->c[0] = WRITE_FILEMARKS;
1107 pc->c[4] = write_filemark;
1108 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1111 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1113 idetape_tape_t *tape = drive->driver_data;
1114 struct gendisk *disk = tape->disk;
1115 int load_attempted = 0;
1117 /* Wait for the tape to become ready */
1118 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1120 while (time_before(jiffies, timeout)) {
1121 if (ide_do_test_unit_ready(drive, disk) == 0)
1123 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1124 || (tape->asc == 0x3A)) {
1128 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1130 /* not about to be ready */
1131 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1132 (tape->ascq == 1 || tape->ascq == 8)))
1139 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1141 struct ide_tape_obj *tape = drive->driver_data;
1142 struct ide_atapi_pc pc;
1145 idetape_create_write_filemark_cmd(drive, &pc, 0);
1146 rc = ide_queue_pc_tail(drive, tape->disk, &pc);
1149 idetape_wait_ready(drive, 60 * 5 * HZ);
1153 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1156 pc->c[0] = READ_POSITION;
1160 static int idetape_read_position(ide_drive_t *drive)
1162 idetape_tape_t *tape = drive->driver_data;
1163 struct ide_atapi_pc pc;
1166 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1168 idetape_create_read_position_cmd(&pc);
1169 if (ide_queue_pc_tail(drive, tape->disk, &pc))
1171 position = tape->first_frame;
1175 static void idetape_create_locate_cmd(ide_drive_t *drive,
1176 struct ide_atapi_pc *pc,
1177 unsigned int block, u8 partition, int skip)
1180 pc->c[0] = POSITION_TO_ELEMENT;
1182 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1183 pc->c[8] = partition;
1184 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1187 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1189 idetape_tape_t *tape = drive->driver_data;
1191 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1194 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1195 tape->merge_bh_size = 0;
1196 if (tape->merge_bh != NULL) {
1197 ide_tape_kfree_buffer(tape);
1198 tape->merge_bh = NULL;
1201 tape->chrdev_dir = IDETAPE_DIR_NONE;
1205 * Position the tape to the requested block using the LOCATE packet command.
1206 * A READ POSITION command is then issued to check where we are positioned. Like
1207 * all higher level operations, we queue the commands at the tail of the request
1208 * queue and wait for their completion.
1210 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1211 u8 partition, int skip)
1213 idetape_tape_t *tape = drive->driver_data;
1214 struct gendisk *disk = tape->disk;
1216 struct ide_atapi_pc pc;
1218 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1219 __ide_tape_discard_merge_buffer(drive);
1220 idetape_wait_ready(drive, 60 * 5 * HZ);
1221 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1222 retval = ide_queue_pc_tail(drive, disk, &pc);
1226 idetape_create_read_position_cmd(&pc);
1227 return ide_queue_pc_tail(drive, disk, &pc);
1230 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1231 int restore_position)
1233 idetape_tape_t *tape = drive->driver_data;
1236 __ide_tape_discard_merge_buffer(drive);
1237 if (restore_position) {
1238 position = idetape_read_position(drive);
1239 seek = position > 0 ? position : 0;
1240 if (idetape_position_tape(drive, seek, 0, 0)) {
1241 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1242 " %s\n", tape->name, __func__);
1249 * Generate a read/write request for the block device interface and wait for it
1252 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1253 struct idetape_bh *bh)
1255 idetape_tape_t *tape = drive->driver_data;
1259 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1261 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1262 rq->cmd_type = REQ_TYPE_SPECIAL;
1264 rq->rq_disk = tape->disk;
1265 rq->special = (void *)bh;
1266 rq->sector = tape->first_frame;
1267 rq->nr_sectors = blocks;
1268 rq->current_nr_sectors = blocks;
1269 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1271 errors = rq->errors;
1272 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1273 blk_put_request(rq);
1275 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1279 idetape_init_merge_buffer(tape);
1280 if (errors == IDETAPE_ERROR_GENERAL)
1285 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1293 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1294 struct ide_atapi_pc *pc)
1297 pc->c[0] = REZERO_UNIT;
1298 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1301 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1306 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1309 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1313 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1315 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1318 /* Queue up a character device originated write request. */
1319 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1321 idetape_tape_t *tape = drive->driver_data;
1323 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1325 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1326 blocks, tape->merge_bh);
1329 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1331 idetape_tape_t *tape = drive->driver_data;
1333 struct idetape_bh *bh;
1335 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1336 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1337 " but we are not writing.\n");
1340 if (tape->merge_bh_size > tape->buffer_size) {
1341 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1342 tape->merge_bh_size = tape->buffer_size;
1344 if (tape->merge_bh_size) {
1345 blocks = tape->merge_bh_size / tape->blk_size;
1346 if (tape->merge_bh_size % tape->blk_size) {
1350 i = tape->blk_size - tape->merge_bh_size %
1352 bh = tape->bh->b_reqnext;
1354 atomic_set(&bh->b_count, 0);
1360 printk(KERN_INFO "ide-tape: bug,"
1364 min = min(i, (unsigned int)(bh->b_size -
1365 atomic_read(&bh->b_count)));
1366 memset(bh->b_data + atomic_read(&bh->b_count),
1368 atomic_add(min, &bh->b_count);
1373 (void) idetape_add_chrdev_write_request(drive, blocks);
1374 tape->merge_bh_size = 0;
1376 if (tape->merge_bh != NULL) {
1377 ide_tape_kfree_buffer(tape);
1378 tape->merge_bh = NULL;
1380 tape->chrdev_dir = IDETAPE_DIR_NONE;
1383 static int idetape_init_read(ide_drive_t *drive)
1385 idetape_tape_t *tape = drive->driver_data;
1388 /* Initialize read operation */
1389 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1390 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1391 ide_tape_flush_merge_buffer(drive);
1392 idetape_flush_tape_buffers(drive);
1394 if (tape->merge_bh || tape->merge_bh_size) {
1395 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1397 tape->merge_bh_size = 0;
1399 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1400 if (!tape->merge_bh)
1402 tape->chrdev_dir = IDETAPE_DIR_READ;
1405 * Issue a read 0 command to ensure that DSC handshake is
1406 * switched from completion mode to buffer available mode.
1407 * No point in issuing this if DSC overlap isn't supported, some
1408 * drives (Seagate STT3401A) will return an error.
1410 if (drive->dsc_overlap) {
1411 bytes_read = idetape_queue_rw_tail(drive,
1412 REQ_IDETAPE_READ, 0,
1414 if (bytes_read < 0) {
1415 ide_tape_kfree_buffer(tape);
1416 tape->merge_bh = NULL;
1417 tape->chrdev_dir = IDETAPE_DIR_NONE;
1426 /* called from idetape_chrdev_read() to service a chrdev read request. */
1427 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1429 idetape_tape_t *tape = drive->driver_data;
1431 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1433 /* If we are at a filemark, return a read length of 0 */
1434 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1437 idetape_init_read(drive);
1439 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1443 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1445 idetape_tape_t *tape = drive->driver_data;
1446 struct idetape_bh *bh;
1452 bh = tape->merge_bh;
1453 count = min(tape->buffer_size, bcount);
1455 blocks = count / tape->blk_size;
1457 atomic_set(&bh->b_count,
1458 min(count, (unsigned int)bh->b_size));
1459 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1460 count -= atomic_read(&bh->b_count);
1463 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1469 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1470 * currently support only one partition.
1472 static int idetape_rewind_tape(ide_drive_t *drive)
1474 struct ide_tape_obj *tape = drive->driver_data;
1475 struct gendisk *disk = tape->disk;
1477 struct ide_atapi_pc pc;
1479 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1481 idetape_create_rewind_cmd(drive, &pc);
1482 retval = ide_queue_pc_tail(drive, disk, &pc);
1486 idetape_create_read_position_cmd(&pc);
1487 retval = ide_queue_pc_tail(drive, disk, &pc);
1493 /* mtio.h compatible commands should be issued to the chrdev interface. */
1494 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1497 idetape_tape_t *tape = drive->driver_data;
1498 void __user *argp = (void __user *)arg;
1500 struct idetape_config {
1501 int dsc_rw_frequency;
1502 int dsc_media_access_frequency;
1506 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1510 if (copy_from_user(&config, argp, sizeof(config)))
1512 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1515 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1516 config.nr_stages = 1;
1517 if (copy_to_user(argp, &config, sizeof(config)))
1526 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1529 idetape_tape_t *tape = drive->driver_data;
1530 struct gendisk *disk = tape->disk;
1531 struct ide_atapi_pc pc;
1532 int retval, count = 0;
1533 int sprev = !!(tape->caps[4] & 0x20);
1537 if (MTBSF == mt_op || MTBSFM == mt_op) {
1540 mt_count = -mt_count;
1543 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1544 tape->merge_bh_size = 0;
1545 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1547 ide_tape_discard_merge_buffer(drive, 0);
1553 idetape_create_space_cmd(&pc, mt_count - count,
1554 IDETAPE_SPACE_OVER_FILEMARK);
1555 return ide_queue_pc_tail(drive, disk, &pc);
1560 retval = idetape_space_over_filemarks(drive, MTFSF,
1564 count = (MTBSFM == mt_op ? 1 : -1);
1565 return idetape_space_over_filemarks(drive, MTFSF, count);
1567 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1574 * Our character device read / write functions.
1576 * The tape is optimized to maximize throughput when it is transferring an
1577 * integral number of the "continuous transfer limit", which is a parameter of
1578 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1580 * As of version 1.3 of the driver, the character device provides an abstract
1581 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1582 * same backup/restore procedure is supported. The driver will internally
1583 * convert the requests to the recommended transfer unit, so that an unmatch
1584 * between the user's block size to the recommended size will only result in a
1585 * (slightly) increased driver overhead, but will no longer hit performance.
1586 * This is not applicable to Onstream.
1588 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1589 size_t count, loff_t *ppos)
1591 struct ide_tape_obj *tape = ide_tape_f(file);
1592 ide_drive_t *drive = tape->drive;
1593 ssize_t bytes_read, temp, actually_read = 0, rc;
1595 u16 ctl = *(u16 *)&tape->caps[12];
1597 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1599 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1600 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1601 if (count > tape->blk_size &&
1602 (count % tape->blk_size) == 0)
1603 tape->user_bs_factor = count / tape->blk_size;
1605 rc = idetape_init_read(drive);
1610 if (tape->merge_bh_size) {
1611 actually_read = min((unsigned int)(tape->merge_bh_size),
1612 (unsigned int)count);
1613 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1615 buf += actually_read;
1616 tape->merge_bh_size -= actually_read;
1617 count -= actually_read;
1619 while (count >= tape->buffer_size) {
1620 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1621 if (bytes_read <= 0)
1623 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1626 count -= bytes_read;
1627 actually_read += bytes_read;
1630 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1631 if (bytes_read <= 0)
1633 temp = min((unsigned long)count, (unsigned long)bytes_read);
1634 if (idetape_copy_stage_to_user(tape, buf, temp))
1636 actually_read += temp;
1637 tape->merge_bh_size = bytes_read-temp;
1640 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1641 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1643 idetape_space_over_filemarks(drive, MTFSF, 1);
1647 return ret ? ret : actually_read;
1650 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1651 size_t count, loff_t *ppos)
1653 struct ide_tape_obj *tape = ide_tape_f(file);
1654 ide_drive_t *drive = tape->drive;
1655 ssize_t actually_written = 0;
1657 u16 ctl = *(u16 *)&tape->caps[12];
1659 /* The drive is write protected. */
1660 if (tape->write_prot)
1663 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1665 /* Initialize write operation */
1666 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1667 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1668 ide_tape_discard_merge_buffer(drive, 1);
1669 if (tape->merge_bh || tape->merge_bh_size) {
1670 printk(KERN_ERR "ide-tape: merge_bh_size "
1671 "should be 0 now\n");
1672 tape->merge_bh_size = 0;
1674 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1675 if (!tape->merge_bh)
1677 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1678 idetape_init_merge_buffer(tape);
1681 * Issue a write 0 command to ensure that DSC handshake is
1682 * switched from completion mode to buffer available mode. No
1683 * point in issuing this if DSC overlap isn't supported, some
1684 * drives (Seagate STT3401A) will return an error.
1686 if (drive->dsc_overlap) {
1687 ssize_t retval = idetape_queue_rw_tail(drive,
1688 REQ_IDETAPE_WRITE, 0,
1691 ide_tape_kfree_buffer(tape);
1692 tape->merge_bh = NULL;
1693 tape->chrdev_dir = IDETAPE_DIR_NONE;
1700 if (tape->merge_bh_size) {
1701 if (tape->merge_bh_size >= tape->buffer_size) {
1702 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1703 tape->merge_bh_size = 0;
1705 actually_written = min((unsigned int)
1706 (tape->buffer_size - tape->merge_bh_size),
1707 (unsigned int)count);
1708 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1710 buf += actually_written;
1711 tape->merge_bh_size += actually_written;
1712 count -= actually_written;
1714 if (tape->merge_bh_size == tape->buffer_size) {
1716 tape->merge_bh_size = 0;
1717 retval = idetape_add_chrdev_write_request(drive, ctl);
1722 while (count >= tape->buffer_size) {
1724 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1726 buf += tape->buffer_size;
1727 count -= tape->buffer_size;
1728 retval = idetape_add_chrdev_write_request(drive, ctl);
1729 actually_written += tape->buffer_size;
1734 actually_written += count;
1735 if (idetape_copy_stage_from_user(tape, buf, count))
1737 tape->merge_bh_size += count;
1739 return ret ? ret : actually_written;
1742 static int idetape_write_filemark(ide_drive_t *drive)
1744 struct ide_tape_obj *tape = drive->driver_data;
1745 struct ide_atapi_pc pc;
1747 /* Write a filemark */
1748 idetape_create_write_filemark_cmd(drive, &pc, 1);
1749 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1750 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1757 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1760 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1761 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1762 * usually not supported.
1764 * The following commands are currently not supported:
1766 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1767 * MT_ST_WRITE_THRESHOLD.
1769 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1771 idetape_tape_t *tape = drive->driver_data;
1772 struct gendisk *disk = tape->disk;
1773 struct ide_atapi_pc pc;
1776 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1786 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1793 if (tape->write_prot)
1795 ide_tape_discard_merge_buffer(drive, 1);
1796 for (i = 0; i < mt_count; i++) {
1797 retval = idetape_write_filemark(drive);
1803 ide_tape_discard_merge_buffer(drive, 0);
1804 if (idetape_rewind_tape(drive))
1808 ide_tape_discard_merge_buffer(drive, 0);
1809 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK);
1813 * If door is locked, attempt to unlock before
1814 * attempting to eject.
1816 if (tape->door_locked) {
1817 if (!ide_set_media_lock(drive, disk, 0))
1818 tape->door_locked = DOOR_UNLOCKED;
1820 ide_tape_discard_merge_buffer(drive, 0);
1821 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK);
1823 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1826 ide_tape_discard_merge_buffer(drive, 0);
1827 return idetape_flush_tape_buffers(drive);
1829 ide_tape_discard_merge_buffer(drive, 0);
1830 return ide_do_start_stop(drive, disk,
1831 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1833 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1834 return ide_queue_pc_tail(drive, disk, &pc);
1836 (void)idetape_rewind_tape(drive);
1837 idetape_create_erase_cmd(&pc);
1838 return ide_queue_pc_tail(drive, disk, &pc);
1841 if (mt_count < tape->blk_size ||
1842 mt_count % tape->blk_size)
1844 tape->user_bs_factor = mt_count / tape->blk_size;
1845 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1847 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1850 ide_tape_discard_merge_buffer(drive, 0);
1851 return idetape_position_tape(drive,
1852 mt_count * tape->user_bs_factor, tape->partition, 0);
1854 ide_tape_discard_merge_buffer(drive, 0);
1855 return idetape_position_tape(drive, 0, mt_count, 0);
1859 retval = ide_set_media_lock(drive, disk, 1);
1862 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1865 retval = ide_set_media_lock(drive, disk, 0);
1868 tape->door_locked = DOOR_UNLOCKED;
1871 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1878 * Our character device ioctls. General mtio.h magnetic io commands are
1879 * supported here, and not in the corresponding block interface. Our own
1880 * ide-tape ioctls are supported on both interfaces.
1882 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
1883 unsigned int cmd, unsigned long arg)
1885 struct ide_tape_obj *tape = ide_tape_f(file);
1886 ide_drive_t *drive = tape->drive;
1890 int block_offset = 0, position = tape->first_frame;
1891 void __user *argp = (void __user *)arg;
1893 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1895 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1896 ide_tape_flush_merge_buffer(drive);
1897 idetape_flush_tape_buffers(drive);
1899 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
1900 block_offset = tape->merge_bh_size /
1901 (tape->blk_size * tape->user_bs_factor);
1902 position = idetape_read_position(drive);
1908 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
1910 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
1912 memset(&mtget, 0, sizeof(struct mtget));
1913 mtget.mt_type = MT_ISSCSI2;
1914 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
1916 ((tape->blk_size * tape->user_bs_factor)
1917 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
1919 if (tape->drv_write_prot)
1920 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
1922 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
1926 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
1927 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
1931 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1932 ide_tape_discard_merge_buffer(drive, 1);
1933 return idetape_blkdev_ioctl(drive, cmd, arg);
1938 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1939 * block size with the reported value.
1941 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
1943 idetape_tape_t *tape = drive->driver_data;
1944 struct ide_atapi_pc pc;
1946 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
1947 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
1948 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
1949 if (tape->blk_size == 0) {
1950 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
1951 "block size, assuming 32k\n");
1952 tape->blk_size = 32768;
1956 tape->blk_size = (pc.buf[4 + 5] << 16) +
1957 (pc.buf[4 + 6] << 8) +
1959 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
1962 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1964 unsigned int minor = iminor(inode), i = minor & ~0xc0;
1966 idetape_tape_t *tape;
1969 if (i >= MAX_HWIFS * MAX_DRIVES)
1973 tape = ide_tape_chrdev_get(i);
1979 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1982 * We really want to do nonseekable_open(inode, filp); here, but some
1983 * versions of tar incorrectly call lseek on tapes and bail out if that
1984 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1986 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1988 drive = tape->drive;
1990 filp->private_data = tape;
1992 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
1997 retval = idetape_wait_ready(drive, 60 * HZ);
1999 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2000 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
2004 idetape_read_position(drive);
2005 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
2006 (void)idetape_rewind_tape(drive);
2008 /* Read block size and write protect status from drive. */
2009 ide_tape_get_bsize_from_bdesc(drive);
2011 /* Set write protect flag if device is opened as read-only. */
2012 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
2013 tape->write_prot = 1;
2015 tape->write_prot = tape->drv_write_prot;
2017 /* Make sure drive isn't write protected if user wants to write. */
2018 if (tape->write_prot) {
2019 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
2020 (filp->f_flags & O_ACCMODE) == O_RDWR) {
2021 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2027 /* Lock the tape drive door so user can't eject. */
2028 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2029 if (!ide_set_media_lock(drive, tape->disk, 1)) {
2030 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2031 tape->door_locked = DOOR_LOCKED;
2043 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
2045 idetape_tape_t *tape = drive->driver_data;
2047 ide_tape_flush_merge_buffer(drive);
2048 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
2049 if (tape->merge_bh != NULL) {
2050 idetape_pad_zeros(drive, tape->blk_size *
2051 (tape->user_bs_factor - 1));
2052 ide_tape_kfree_buffer(tape);
2053 tape->merge_bh = NULL;
2055 idetape_write_filemark(drive);
2056 idetape_flush_tape_buffers(drive);
2057 idetape_flush_tape_buffers(drive);
2060 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
2062 struct ide_tape_obj *tape = ide_tape_f(filp);
2063 ide_drive_t *drive = tape->drive;
2064 unsigned int minor = iminor(inode);
2067 tape = drive->driver_data;
2069 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2071 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2072 idetape_write_release(drive, minor);
2073 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2075 ide_tape_discard_merge_buffer(drive, 1);
2078 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2079 (void) idetape_rewind_tape(drive);
2080 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2081 if (tape->door_locked == DOOR_LOCKED) {
2082 if (!ide_set_media_lock(drive, tape->disk, 0))
2083 tape->door_locked = DOOR_UNLOCKED;
2086 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2092 static void idetape_get_inquiry_results(ide_drive_t *drive)
2094 idetape_tape_t *tape = drive->driver_data;
2095 struct ide_atapi_pc pc;
2096 char fw_rev[4], vendor_id[8], product_id[16];
2098 idetape_create_inquiry_cmd(&pc);
2099 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2100 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2104 memcpy(vendor_id, &pc.buf[8], 8);
2105 memcpy(product_id, &pc.buf[16], 16);
2106 memcpy(fw_rev, &pc.buf[32], 4);
2108 ide_fixstring(vendor_id, 8, 0);
2109 ide_fixstring(product_id, 16, 0);
2110 ide_fixstring(fw_rev, 4, 0);
2112 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2113 drive->name, tape->name, vendor_id, product_id, fw_rev);
2117 * Ask the tape about its various parameters. In particular, we will adjust our
2118 * data transfer buffer size to the recommended value as returned by the tape.
2120 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2122 idetape_tape_t *tape = drive->driver_data;
2123 struct ide_atapi_pc pc;
2125 u8 speed, max_speed;
2127 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2128 if (ide_queue_pc_tail(drive, tape->disk, &pc)) {
2129 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2130 " some default values\n");
2131 tape->blk_size = 512;
2132 put_unaligned(52, (u16 *)&tape->caps[12]);
2133 put_unaligned(540, (u16 *)&tape->caps[14]);
2134 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2137 caps = pc.buf + 4 + pc.buf[3];
2139 /* convert to host order and save for later use */
2140 speed = be16_to_cpup((__be16 *)&caps[14]);
2141 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2143 *(u16 *)&caps[8] = max_speed;
2144 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2145 *(u16 *)&caps[14] = speed;
2146 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2149 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2150 "(assuming 650KB/sec)\n", drive->name);
2151 *(u16 *)&caps[14] = 650;
2154 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2155 "(assuming 650KB/sec)\n", drive->name);
2156 *(u16 *)&caps[8] = 650;
2159 memcpy(&tape->caps, caps, 20);
2161 /* device lacks locking support according to capabilities page */
2162 if ((caps[6] & 1) == 0)
2163 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
2166 tape->blk_size = 512;
2167 else if (caps[7] & 0x04)
2168 tape->blk_size = 1024;
2171 #ifdef CONFIG_IDE_PROC_FS
2172 #define ide_tape_devset_get(name, field) \
2173 static int get_##name(ide_drive_t *drive) \
2175 idetape_tape_t *tape = drive->driver_data; \
2176 return tape->field; \
2179 #define ide_tape_devset_set(name, field) \
2180 static int set_##name(ide_drive_t *drive, int arg) \
2182 idetape_tape_t *tape = drive->driver_data; \
2183 tape->field = arg; \
2187 #define ide_tape_devset_rw_field(_name, _field) \
2188 ide_tape_devset_get(_name, _field) \
2189 ide_tape_devset_set(_name, _field) \
2190 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2192 #define ide_tape_devset_r_field(_name, _field) \
2193 ide_tape_devset_get(_name, _field) \
2194 IDE_DEVSET(_name, 0, get_##_name, NULL)
2196 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2197 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2198 static int divf_buffer(ide_drive_t *drive) { return 2; }
2199 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2201 ide_devset_rw_field(dsc_overlap, dsc_overlap);
2203 ide_tape_devset_rw_field(debug_mask, debug_mask);
2204 ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq);
2206 ide_tape_devset_r_field(avg_speed, avg_speed);
2207 ide_tape_devset_r_field(speed, caps[14]);
2208 ide_tape_devset_r_field(buffer, caps[16]);
2209 ide_tape_devset_r_field(buffer_size, buffer_size);
2211 static const struct ide_proc_devset idetape_settings[] = {
2212 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL),
2213 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer),
2214 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size),
2215 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL),
2216 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL),
2217 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL),
2218 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2219 mulf_tdsc, divf_tdsc),
2225 * The function below is called to:
2227 * 1. Initialize our various state variables.
2228 * 2. Ask the tape for its capabilities.
2229 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2230 * is chosen based on the recommendation which we received in step 2.
2232 * Note that at this point ide.c already assigned us an irq, so that we can
2233 * queue requests here and wait for their completion.
2235 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2241 u16 *ctl = (u16 *)&tape->caps[12];
2243 drive->pc_callback = ide_tape_callback;
2245 spin_lock_init(&tape->lock);
2246 drive->dsc_overlap = 1;
2247 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2248 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2250 drive->dsc_overlap = 0;
2252 /* Seagate Travan drives do not support DSC overlap. */
2253 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2254 drive->dsc_overlap = 0;
2255 tape->minor = minor;
2256 tape->name[0] = 'h';
2257 tape->name[1] = 't';
2258 tape->name[2] = '0' + minor;
2259 tape->chrdev_dir = IDETAPE_DIR_NONE;
2261 *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
2263 /* Command packet DRQ type */
2264 if (((gcw[0] & 0x60) >> 5) == 1)
2265 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
2267 idetape_get_inquiry_results(drive);
2268 idetape_get_mode_sense_results(drive);
2269 ide_tape_get_bsize_from_bdesc(drive);
2270 tape->user_bs_factor = 1;
2271 tape->buffer_size = *ctl * tape->blk_size;
2272 while (tape->buffer_size > 0xffff) {
2273 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2275 tape->buffer_size = *ctl * tape->blk_size;
2277 buffer_size = tape->buffer_size;
2278 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2279 if (buffer_size % PAGE_SIZE) {
2280 tape->pages_per_buffer++;
2281 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2284 /* select the "best" DSC read/write polling freq */
2285 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2287 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2290 * Ensure that the number we got makes sense; limit it within
2291 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2293 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2294 IDETAPE_DSC_RW_MAX);
2295 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2297 drive->name, tape->name, *(u16 *)&tape->caps[14],
2298 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2299 tape->buffer_size / 1024,
2300 tape->best_dsc_rw_freq * 1000 / HZ,
2301 drive->using_dma ? ", DMA":"");
2303 ide_proc_register_driver(drive, tape->driver);
2306 static void ide_tape_remove(ide_drive_t *drive)
2308 idetape_tape_t *tape = drive->driver_data;
2310 ide_proc_unregister_driver(drive, tape->driver);
2312 ide_unregister_region(tape->disk);
2317 static void ide_tape_release(struct kref *kref)
2319 struct ide_tape_obj *tape = to_ide_tape(kref);
2320 ide_drive_t *drive = tape->drive;
2321 struct gendisk *g = tape->disk;
2323 BUG_ON(tape->merge_bh_size);
2325 drive->dsc_overlap = 0;
2326 drive->driver_data = NULL;
2327 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2328 device_destroy(idetape_sysfs_class,
2329 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2330 idetape_devs[tape->minor] = NULL;
2331 g->private_data = NULL;
2336 #ifdef CONFIG_IDE_PROC_FS
2337 static int proc_idetape_read_name
2338 (char *page, char **start, off_t off, int count, int *eof, void *data)
2340 ide_drive_t *drive = (ide_drive_t *) data;
2341 idetape_tape_t *tape = drive->driver_data;
2345 len = sprintf(out, "%s\n", tape->name);
2346 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2349 static ide_proc_entry_t idetape_proc[] = {
2350 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2351 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2352 { NULL, 0, NULL, NULL }
2356 static int ide_tape_probe(ide_drive_t *);
2358 static ide_driver_t idetape_driver = {
2360 .owner = THIS_MODULE,
2362 .bus = &ide_bus_type,
2364 .probe = ide_tape_probe,
2365 .remove = ide_tape_remove,
2366 .version = IDETAPE_VERSION,
2368 .do_request = idetape_do_request,
2369 .end_request = idetape_end_request,
2370 .error = __ide_error,
2371 #ifdef CONFIG_IDE_PROC_FS
2372 .proc = idetape_proc,
2373 .settings = idetape_settings,
2377 /* Our character device supporting functions, passed to register_chrdev. */
2378 static const struct file_operations idetape_fops = {
2379 .owner = THIS_MODULE,
2380 .read = idetape_chrdev_read,
2381 .write = idetape_chrdev_write,
2382 .ioctl = idetape_chrdev_ioctl,
2383 .open = idetape_chrdev_open,
2384 .release = idetape_chrdev_release,
2387 static int idetape_open(struct inode *inode, struct file *filp)
2389 struct gendisk *disk = inode->i_bdev->bd_disk;
2390 struct ide_tape_obj *tape;
2392 tape = ide_tape_get(disk);
2399 static int idetape_release(struct inode *inode, struct file *filp)
2401 struct gendisk *disk = inode->i_bdev->bd_disk;
2402 struct ide_tape_obj *tape = ide_tape_g(disk);
2409 static int idetape_ioctl(struct inode *inode, struct file *file,
2410 unsigned int cmd, unsigned long arg)
2412 struct block_device *bdev = inode->i_bdev;
2413 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2414 ide_drive_t *drive = tape->drive;
2415 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2417 err = idetape_blkdev_ioctl(drive, cmd, arg);
2421 static struct block_device_operations idetape_block_ops = {
2422 .owner = THIS_MODULE,
2423 .open = idetape_open,
2424 .release = idetape_release,
2425 .ioctl = idetape_ioctl,
2428 static int ide_tape_probe(ide_drive_t *drive)
2430 idetape_tape_t *tape;
2434 if (!strstr("ide-tape", drive->driver_req))
2437 if (drive->media != ide_tape)
2440 if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) {
2441 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2442 " the driver\n", drive->name);
2445 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2447 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2452 g = alloc_disk(1 << PARTN_BITS);
2456 ide_init_disk(g, drive);
2458 kref_init(&tape->kref);
2460 tape->drive = drive;
2461 tape->driver = &idetape_driver;
2464 g->private_data = &tape->driver;
2466 drive->driver_data = tape;
2468 mutex_lock(&idetape_ref_mutex);
2469 for (minor = 0; idetape_devs[minor]; minor++)
2471 idetape_devs[minor] = tape;
2472 mutex_unlock(&idetape_ref_mutex);
2474 idetape_setup(drive, tape, minor);
2476 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2477 MKDEV(IDETAPE_MAJOR, minor), NULL,
2479 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2480 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2483 g->fops = &idetape_block_ops;
2484 ide_register_region(g);
2494 static void __exit idetape_exit(void)
2496 driver_unregister(&idetape_driver.gen_driver);
2497 class_destroy(idetape_sysfs_class);
2498 unregister_chrdev(IDETAPE_MAJOR, "ht");
2501 static int __init idetape_init(void)
2504 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2505 if (IS_ERR(idetape_sysfs_class)) {
2506 idetape_sysfs_class = NULL;
2507 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2512 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2513 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2516 goto out_free_class;
2519 error = driver_register(&idetape_driver.gen_driver);
2521 goto out_free_driver;
2526 driver_unregister(&idetape_driver.gen_driver);
2528 class_destroy(idetape_sysfs_class);
2533 MODULE_ALIAS("ide:*m-tape*");
2534 module_init(idetape_init);
2535 module_exit(idetape_exit);
2536 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2537 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2538 MODULE_LICENSE("GPL");