Merge branch 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

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

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ffb13ad..6690e8b 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -158,7 +158,6 @@ enum rq_flag_bits {
 struct request {
        struct list_head queuelist;
        struct call_single_data csd;
-       int cpu;
 
        struct request_queue *q;
 
@@ -166,9 +165,11 @@ struct request {
        enum rq_cmd_type_bits cmd_type;
        unsigned long atomic_flags;
 
+       int cpu;
+
        /* the following two fields are internal, NEVER access directly */
-       sector_t __sector;              /* sector cursor */
        unsigned int __data_len;        /* total data len */
+       sector_t __sector;              /* sector cursor */
 
        struct bio *bio;
        struct bio *biotail;
@@ -201,20 +202,20 @@ struct request {
 
        unsigned short ioprio;
 
+       int ref_count;
+
        void *special;          /* opaque pointer available for LLD use */
        char *buffer;           /* kaddr of the current segment if available */
 
        int tag;
        int errors;
 
-       int ref_count;
-
        /*
         * when request is used as a packet command carrier
         */
-       unsigned short cmd_len;
        unsigned char __cmd[BLK_MAX_CDB];
        unsigned char *cmd;
+       unsigned short cmd_len;
 
        unsigned int extra_len; /* length of alignment and padding */
        unsigned int sense_len;
@@ -316,8 +317,7 @@ 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 +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) |            \
@@ -586,9 +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)
@@ -920,10 +921,8 @@ 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);
+extern void blk_queue_max_segments(struct request_queue *, unsigned short);
 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);
@@ -1013,14 +1012,13 @@ static inline int sb_issue_discard(struct super_block *sb,
 
 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)
 
@@ -1044,14 +1042,9 @@ 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)
-{
-       return q->limits.max_hw_segments;
-}
-
-static inline unsigned short queue_max_phys_segments(struct request_queue *q)
+static inline unsigned short queue_max_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)