block: Add BLK_ prefix to definitions

[safe/jmp/linux-2.6] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e727f6c..5d37862 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -322,6 +322,7 @@ struct queue_limits {
        unsigned char           misaligned;
        unsigned char           discard_misaligned;
        unsigned char           no_cluster;
+       signed char             discard_zeroes_data;
 };
 
 struct request_queue
@@ -460,8 +461,8 @@ struct request_queue
 #define QUEUE_FLAG_NONROT      14      /* non-rotational device (SSD) */
 #define QUEUE_FLAG_VIRT        QUEUE_FLAG_NONROT /* paravirt device */
 #define QUEUE_FLAG_IO_STAT     15      /* do IO stats */
-#define QUEUE_FLAG_CQ         16       /* hardware does queuing */
-#define QUEUE_FLAG_DISCARD     17      /* supports DISCARD */
+#define QUEUE_FLAG_DISCARD     16      /* supports DISCARD */
+#define QUEUE_FLAG_NOXMERGES   17      /* No extended merges */
 
 #define QUEUE_FLAG_DEFAULT     ((1 << QUEUE_FLAG_IO_STAT) |            \
                                 (1 << QUEUE_FLAG_CLUSTER) |            \
@@ -585,9 +586,10 @@ 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_queuing(q)   test_bit(QUEUE_FLAG_CQ, &(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_noxmerges(q) \
+       test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
 #define blk_queue_nonrot(q)    test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
 #define blk_queue_io_stat(q)   test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
 #define blk_queue_flushing(q)  ((q)->ordseq)
@@ -844,7 +846,6 @@ static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
  * blk_rq_err_bytes()          : bytes left till the next error boundary
  * blk_rq_sectors()            : sectors left in the entire request
  * blk_rq_cur_sectors()                : sectors left in the current segment
- * blk_rq_err_sectors()                : sectors left till the next error boundary
  */
 static inline sector_t blk_rq_pos(const struct request *rq)
 {
@@ -873,11 +874,6 @@ static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
        return blk_rq_cur_bytes(rq) >> 9;
 }
 
-static inline unsigned int blk_rq_err_sectors(const struct request *rq)
-{
-       return blk_rq_err_bytes(rq) >> 9;
-}
-
 /*
  * Request issue related functions.
  */
@@ -926,7 +922,6 @@ extern void blk_cleanup_queue(struct request_queue *);
 extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
 extern void blk_queue_bounce_limit(struct request_queue *, u64);
 extern void blk_queue_max_sectors(struct request_queue *, unsigned int);
-extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
 extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short);
 extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short);
 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
@@ -943,6 +938,8 @@ extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
 extern void blk_set_default_limits(struct queue_limits *lim);
 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
                            sector_t offset);
+extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
+                           sector_t offset);
 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
                              sector_t offset);
 extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
@@ -1019,11 +1016,15 @@ extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
 #define MAX_PHYS_SEGMENTS 128
 #define MAX_HW_SEGMENTS 128
 #define SAFE_MAX_SECTORS 255
-#define BLK_DEF_MAX_SECTORS 1024
-
 #define MAX_SEGMENT_SIZE       65536
 
-#define BLK_SEG_BOUNDARY_MASK  0xFFFFFFFFUL
+enum blk_default_limits {
+       BLK_MAX_SEGMENTS        = 128,
+       BLK_SAFE_MAX_SECTORS    = 255,
+       BLK_DEF_MAX_SECTORS     = 1024,
+       BLK_MAX_SEGMENT_SIZE    = 65536,
+       BLK_SEG_BOUNDARY_MASK   = 0xFFFFFFFFUL,
+};
 
 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
 
@@ -1115,11 +1116,13 @@ static inline int queue_alignment_offset(struct request_queue *q)
        return q->limits.alignment_offset;
 }
 
-static inline int queue_sector_alignment_offset(struct request_queue *q,
-                                               sector_t sector)
+static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
 {
-       return ((sector << 9) - q->limits.alignment_offset)
-               & (q->limits.io_min - 1);
+       unsigned int granularity = max(lim->physical_block_size, lim->io_min);
+       unsigned int alignment = (sector << 9) & (granularity - 1);
+
+       return (granularity + lim->alignment_offset - alignment)
+               & (granularity - 1);
 }
 
 static inline int bdev_alignment_offset(struct block_device *bdev)
@@ -1143,11 +1146,25 @@ static inline int queue_discard_alignment(struct request_queue *q)
        return q->limits.discard_alignment;
 }
 
-static inline int queue_sector_discard_alignment(struct request_queue *q,
-                                                sector_t sector)
+static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
+{
+       unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1);
+
+       return (lim->discard_granularity + lim->discard_alignment - alignment)
+               & (lim->discard_granularity - 1);
+}
+
+static inline unsigned int queue_discard_zeroes_data(struct request_queue *q)
+{
+       if (q->limits.discard_zeroes_data == 1)
+               return 1;
+
+       return 0;
+}
+
+static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev)
 {
-       return ((sector << 9) - q->limits.discard_alignment)
-               & (q->limits.discard_granularity - 1);
+       return queue_discard_zeroes_data(bdev_get_queue(bdev));
 }
 
 static inline int queue_dma_alignment(struct request_queue *q)