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>
---
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 */
--
1.5.4.2
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