block: Consolidate phys_segment and hw_segment limits

[mirror_ubuntu-bionic-kernel.git] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 9b98173a81845bc4dc61b0bb30a516e738c4ec5d..ebd22dbed861da16481a1f4995dd9460f71caca4 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -316,8 +316,7 @@ struct queue_limits {
        unsigned int            discard_alignment;
 
        unsigned short          logical_block_size;
-       unsigned short          max_hw_segments;
-       unsigned short          max_phys_segments;
+       unsigned short          max_segments;
 
        unsigned char           misaligned;
        unsigned char           discard_misaligned;
@@ -461,8 +460,8 @@ 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) |            \
@@ -586,9 +585,10 @@ 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)
@@ -920,10 +920,27 @@ extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
 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);
+
+/* Temporary compatibility wrapper */
+static inline void blk_queue_max_sectors(struct request_queue *q, unsigned int max)
+{
+       blk_queue_max_hw_sectors(q, max);
+}
+
+extern void blk_queue_max_segments(struct request_queue *, unsigned short);
+
+static inline void blk_queue_max_phys_segments(struct request_queue *q, unsigned short max)
+{
+       blk_queue_max_segments(q, max);
+}
+
+static inline void blk_queue_max_hw_segments(struct request_queue *q, unsigned short max)
+{
+       blk_queue_max_segments(q, max);
+}
+
+
 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
 extern void blk_queue_max_discard_sectors(struct request_queue *q,
                unsigned int max_discard_sectors);
@@ -938,6 +955,8 @@ 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);
@@ -1014,11 +1033,15 @@ 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)
 
@@ -1042,14 +1065,9 @@ static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
        return q->limits.max_hw_sectors;
 }
 
-static inline unsigned short queue_max_hw_segments(struct request_queue *q)
+static inline unsigned short queue_max_segments(struct request_queue *q)
 {
-       return q->limits.max_hw_segments;
-}
-
-static inline unsigned short queue_max_phys_segments(struct request_queue *q)
-{
-       return q->limits.max_phys_segments;
+       return q->limits.max_segments;
 }
 
 static inline unsigned int queue_max_segment_size(struct request_queue *q)
@@ -1110,18 +1128,13 @@ static inline int queue_alignment_offset(struct request_queue *q)
        return q->limits.alignment_offset;
 }
 
-static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t offset)
+static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
 {
        unsigned int granularity = max(lim->physical_block_size, lim->io_min);
+       unsigned int alignment = (sector << 9) & (granularity - 1);
 
-       offset &= granularity - 1;
-       return (granularity + lim->alignment_offset - offset) & (granularity - 1);
-}
-
-static inline int queue_sector_alignment_offset(struct request_queue *q,
-                                               sector_t sector)
-{
-       return queue_limit_alignment_offset(&q->limits, sector << 9);
+       return (granularity + lim->alignment_offset - alignment)
+               & (granularity - 1);
 }
 
 static inline int bdev_alignment_offset(struct block_device *bdev)
@@ -1145,11 +1158,12 @@ 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)
 {
-       return ((sector << 9) - q->limits.discard_alignment)
-               & (q->limits.discard_granularity - 1);
+       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)