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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-04-29 09:54:39 +0200
committerJens Axboe <jens.axboe@oracle.com>2008-04-29 14:48:55 +0200
commitd7e3c3249ef23b4617393c69fe464765b4ff1645 (patch)
tree3471ea20b7fb4c4a9bbd7cfb3cc952344b5501d6
parentd34c87e4ba3d1857f80a65179e81a18705a31656 (diff)
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.c1
-rw-r--r--include/linux/blkdev.h5
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 */