diff options
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 41 |
1 files changed, 25 insertions, 16 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index cb3b342d4163..212e53167f88 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -22,30 +22,35 @@ struct request_list { wait_queue_head_t wait; }; +/* + * try to put the fields that are referenced together in the same cacheline + */ struct request { struct list_head queuelist; /* looking for ->queue? you must _not_ * access it directly, use * blkdev_dequeue_request! */ - int ref_count; - - void *elevator_private; + unsigned long flags; /* see REQ_ bits below */ - unsigned char cmd[16]; + kdev_t rq_dev; + sector_t sector; + unsigned long nr_sectors; + unsigned int current_nr_sectors; - unsigned long flags; /* see REQ_ bits below */ + void *elevator_private; int rq_status; /* should split this into a few status bits */ - kdev_t rq_dev; struct gendisk *rq_disk; int errors; - sector_t sector; unsigned long start_time; - unsigned long nr_sectors; sector_t hard_sector; /* the hard_* are block layer * internals, no driver should * touch them */ unsigned long hard_nr_sectors; + unsigned int hard_cur_sectors; + + struct bio *bio; + struct bio *biotail; /* Number of scatter-gather DMA addr+len pairs after * physical address coalescing is performed. @@ -59,13 +64,21 @@ struct request { */ unsigned short nr_hw_segments; - unsigned int current_nr_sectors; - unsigned int hard_cur_sectors; int tag; - void *special; char *buffer; - /* For packet commands */ + int ref_count; + request_queue_t *q; + struct request_list *rl; + + struct completion *waiting; + void *special; + + /* + * when request is used as a packet command carrier + */ + unsigned char cmd[16]; + unsigned int data_len; void *data; @@ -73,10 +86,6 @@ struct request { void *sense; unsigned int timeout; - struct completion *waiting; - struct bio *bio, *biotail; - request_queue_t *q; - struct request_list *rl; }; /* |