Improve queue_is_locked()

[linux-2.6-omap-h63xx.git] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index c5065e3d2ca9eea3e1a4319d117cdf4d5abbd539..d2a1b71e93c3eee9570e86513bdb2786d260699c 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -215,8 +215,9 @@ struct request {
        /*
         * when request is used as a packet command carrier
         */
-       unsigned int cmd_len;
-       unsigned char cmd[BLK_MAX_CDB];
+       unsigned short cmd_len;
+       unsigned char __cmd[BLK_MAX_CDB];
+       unsigned char *cmd;
 
        unsigned int data_len;
        unsigned int extra_len; /* length of alignment and padding */
@@ -407,6 +408,41 @@ struct request_queue
 #define QUEUE_FLAG_PLUGGED     7       /* queue is plugged */
 #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 */
+
+static inline int queue_is_locked(struct request_queue *q)
+{
+#ifdef CONFIG_SMP
+       spinlock_t *lock = q->queue_lock;
+       return lock && spin_is_locked(lock);
+#else
+       return 1;
+#endif
+}
+
+static inline void queue_flag_set_unlocked(unsigned int flag,
+                                          struct request_queue *q)
+{
+       __set_bit(flag, &q->queue_flags);
+}
+
+static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
+{
+       WARN_ON_ONCE(!queue_is_locked(q));
+       __set_bit(flag, &q->queue_flags);
+}
+
+static inline void queue_flag_clear_unlocked(unsigned int flag,
+                                            struct request_queue *q)
+{
+       __clear_bit(flag, &q->queue_flags);
+}
+
+static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
+{
+       WARN_ON_ONCE(!queue_is_locked(q));
+       __clear_bit(flag, &q->queue_flags);
+}
 
 enum {
        /*
@@ -451,6 +487,7 @@ enum {
 #define blk_queue_plugged(q)   test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags)
 #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_flushing(q)  ((q)->ordseq)
 
 #define blk_fs_request(rq)     ((rq)->cmd_type == REQ_TYPE_FS)
@@ -496,17 +533,17 @@ static inline int blk_queue_full(struct request_queue *q, int rw)
 static inline void blk_set_queue_full(struct request_queue *q, int rw)
 {
        if (rw == READ)
-               set_bit(QUEUE_FLAG_READFULL, &q->queue_flags);
+               queue_flag_set(QUEUE_FLAG_READFULL, q);
        else
-               set_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags);
+               queue_flag_set(QUEUE_FLAG_WRITEFULL, q);
 }
 
 static inline void blk_clear_queue_full(struct request_queue *q, int rw)
 {
        if (rw == READ)
-               clear_bit(QUEUE_FLAG_READFULL, &q->queue_flags);
+               queue_flag_clear(QUEUE_FLAG_READFULL, q);
        else
-               clear_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags);
+               queue_flag_clear(QUEUE_FLAG_WRITEFULL, q);
 }
 
 
@@ -583,6 +620,7 @@ extern int blk_register_queue(struct gendisk *disk);
 extern void blk_unregister_queue(struct gendisk *disk);
 extern void register_disk(struct gendisk *dev);
 extern void generic_make_request(struct bio *bio);
+extern void blk_rq_init(struct request_queue *q, struct request *rq);
 extern void blk_put_request(struct request *);
 extern void __blk_put_request(struct request_queue *, struct request *);
 extern void blk_end_sync_rq(struct request *rq, int error);
@@ -626,6 +664,7 @@ extern void blk_start_queue(struct request_queue *q);
 extern void blk_stop_queue(struct request_queue *q);
 extern void blk_sync_queue(struct request_queue *q);
 extern void __blk_stop_queue(struct request_queue *q);
+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);