From: FUJITA Tomonori Date: Tue, 29 Apr 2008 07:54:39 +0000 (+0200) Subject: block: add large command support X-Git-Tag: v2.6.26-rc1~372^2~1 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=d7e3c3249ef23b4617393c69fe464765b4ff1645;p=linux-2.6-omap-h63xx.git 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 Cc: Jens Axboe Signed-off-by: Jens Axboe --- diff --git a/block/blk-core.c b/block/blk-core.c index e6fdb288be6..5d09f8c5602 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 d17032c347c..08df1ea8bac 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 */