On Fri, Apr 25 2008 at 19:23 +0300, FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> wrote:
> 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@xxxxxxxxxxxxx>
> Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Please, if not to late, add:
Cc: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
> ---
> block/blk-core.c | 1 +
> 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 a89adcc..35ae1c0 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 d17032c..08df1ea 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 */
--
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