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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>
This commit is contained in:
FUJITA Tomonori 2008-04-29 09:54:39 +02:00 committed by Jens Axboe
parent d34c87e4ba
commit d7e3c3249e
2 changed files with 4 additions and 2 deletions
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1
block/blk-core.c
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@ -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;
}

5
include/linux/blkdev.h
View File

@ -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 */