diff options
| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-04-29 09:54:39 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-04-29 14:48:55 +0200 |
| commit | d7e3c3249ef23b4617393c69fe464765b4ff1645 (patch) | |
| tree | 3471ea20b7fb4c4a9bbd7cfb3cc952344b5501d6 | |
| parent | d34c87e4ba3d1857f80a65179e81a18705a31656 (diff) | |
| download | linux-d7e3c3249ef23b4617393c69fe464765b4ff1645.tar.bz2 | |
block: add large command support
This patch changes rq->cmd from the static array to a pointer to
support large commands.
We rarely handle large commands. So for optimization, a struct request
still has a static array for a command. rq_init sets rq->cmd pointer
to the static array.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| -rw-r--r-- | block/blk-core.c | 1 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 5 |
2 files changed, 4 insertions, 2 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index e6fdb288be65..5d09f8c56024 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -117,6 +117,7 @@ void blk_rq_init(struct request_queue *q, struct request *rq) rq->sector = rq->hard_sector = (sector_t) -1; INIT_HLIST_NODE(&rq->hash); RB_CLEAR_NODE(&rq->rb_node); + rq->cmd = rq->__cmd; rq->tag = -1; rq->ref_count = 1; } diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index d17032c347c0..08df1ea8bac4 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -215,8 +215,9 @@ struct request { /* * when request is used as a packet command carrier */ - unsigned int cmd_len; - unsigned char cmd[BLK_MAX_CDB]; + unsigned short cmd_len; + unsigned char __cmd[BLK_MAX_CDB]; + unsigned char *cmd; unsigned int data_len; unsigned int extra_len; /* length of alignment and padding */ |