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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2007-07-16 08:52:14 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-07-16 08:52:46 +0200 |
| commit | abae1fde63fcdd2a3abaa0d7930938d8326f83d2 (patch) | |
| tree | 4b61cd4e13b511229193549162607894badab984 | |
| parent | efba1a31f3f8fe9672eb96cd26e97fb96891f1c0 (diff) | |
| download | linux-abae1fde63fcdd2a3abaa0d7930938d8326f83d2.tar.gz linux-abae1fde63fcdd2a3abaa0d7930938d8326f83d2.tar.bz2 linux-abae1fde63fcdd2a3abaa0d7930938d8326f83d2.zip | |
add a struct request pointer to the request structure
This adds a struct request pointer to the request structure for the
second data phase (bidi for now). A request queue supporting bidi
requests sets QUEUE_FLAG_BIDI. This prevents sending bidi requests to
a non-bidi queue.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| -rw-r--r-- | block/ll_rw_blk.c | 1 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 5 |
2 files changed, 6 insertions, 0 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index ef42bb2b12b6..11e4235d0b0c 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -256,6 +256,7 @@ static void rq_init(request_queue_t *q, struct request *rq) rq->end_io = NULL; rq->end_io_data = NULL; rq->completion_data = NULL; + rq->next_rq = NULL; } /** diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 24b474e05a44..b32564a1e105 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -317,6 +317,9 @@ struct request { */ rq_end_io_fn *end_io; void *end_io_data; + + /* for bidi */ + struct request *next_rq; }; /* @@ -486,6 +489,7 @@ struct request_queue #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ +#define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ enum { /* @@ -550,6 +554,7 @@ enum { #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) +#define blk_bidi_rq(rq) ((rq)->next_rq != NULL) #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |