]> nv-tegra.nvidia Code Review - linux-2.6.git/commitdiff
Merge branch 'for-2.6.19' of git://brick.kernel.dk/data/git/linux-2.6-block
authorLinus Torvalds <torvalds@g5.osdl.org>
Wed, 4 Oct 2006 17:44:01 +0000 (10:44 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Wed, 4 Oct 2006 17:44:01 +0000 (10:44 -0700)
* 'for-2.6.19' of git://brick.kernel.dk/data/git/linux-2.6-block:
  [PATCH] Document bi_sector and sector_t
  [PATCH] helper function for retrieving scsi_cmd given host based block layer tag

block/ll_rw_blk.c
include/linux/bio.h
include/linux/blkdev.h
include/linux/types.h
include/scsi/scsi_tcq.h

index 83425fb3c8dba6e2b62122aaa6a02a25d2436ab4..c847e17e5caa3dbf894631c321b3608c2417ca40 100644 (file)
@@ -840,12 +840,7 @@ EXPORT_SYMBOL(blk_queue_dma_alignment);
  **/
 struct request *blk_queue_find_tag(request_queue_t *q, int tag)
 {
-       struct blk_queue_tag *bqt = q->queue_tags;
-
-       if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
-               return NULL;
-
-       return bqt->tag_index[tag];
+       return blk_map_queue_find_tag(q->queue_tags, tag);
 }
 
 EXPORT_SYMBOL(blk_queue_find_tag);
index 711c321a70119f07b6bc1d6192caec4f64aa017c..092dbd0e76586023c76850495c71ca1ab933efc3 100644 (file)
@@ -70,7 +70,8 @@ typedef void (bio_destructor_t) (struct bio *);
  * stacking drivers)
  */
 struct bio {
-       sector_t                bi_sector;
+       sector_t                bi_sector;      /* device address in 512 byte
+                                                  sectors */
        struct bio              *bi_next;       /* request queue link */
        struct block_device     *bi_bdev;
        unsigned long           bi_flags;       /* status, command, etc */
index 1d79b8d4ca6dcc21f2e9f80775883350eb389547..26f7856ff8123e4b249ca985505fcd80d7d367d3 100644 (file)
@@ -769,6 +769,14 @@ extern struct blk_queue_tag *blk_init_tags(int);
 extern void blk_free_tags(struct blk_queue_tag *);
 extern void blk_congestion_end(int rw);
 
+static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
+                                               int tag)
+{
+       if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
+               return NULL;
+       return bqt->tag_index[tag];
+}
+
 extern void blk_rq_bio_prep(request_queue_t *, struct request *, struct bio *);
 extern int blkdev_issue_flush(struct block_device *, sector_t *);
 
index 406d4ae57631709542ad5097b1aba9216fa2a4c3..750f085fa564f75a0547a7ddcc38176cb63d4571 100644 (file)
@@ -129,8 +129,12 @@ typedef            __s64           int64_t;
 /* this is a special 64bit data type that is 8-byte aligned */
 #define aligned_u64 unsigned long long __attribute__((aligned(8)))
 
-/*
+/**
  * The type used for indexing onto a disc or disc partition.
+ *
+ * Linux always considers sectors to be 512 bytes long independently
+ * of the devices real block size.
+ *
  * If required, asm/types.h can override it and define
  * HAVE_SECTOR_T
  */
index c247a28259bc77fa453994b3492a457f8b99bb7c..cf4c219c0b5cb9ab758046737b2ca814164b01a0 100644 (file)
@@ -144,5 +144,25 @@ static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth)
        return shost->bqt ? 0 : -ENOMEM;
 }
 
+/**
+ * scsi_host_find_tag - find the tagged command by host
+ * @shost:     pointer to scsi_host
+ * @tag:       tag of the scsi_cmnd
+ *
+ * Notes:
+ *     Only works with tags allocated by the generic blk layer.
+ **/
+static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost,
+                                               int tag)
+{
+       struct request *req;
+
+       if (tag != SCSI_NO_TAG) {
+               req = blk_map_queue_find_tag(shost->bqt, tag);
+               return req ? (struct scsi_cmnd *)req->special : NULL;
+       }
+       return NULL;
+}
+
 #endif /* CONFIG_BLOCK */
 #endif /* _SCSI_SCSI_TCQ_H */