From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
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. blk_init_rq sets rq->cmd pointer
to the static array.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Signed-off-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
---
block/blk-core.c | 1 +
include/linux/blkdev.h | 12 ++++++++++--
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index ca103d1..4c97fe2 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -119,6 +119,7 @@ void blk_init_rq(struct request_queue *q, struct request *rq, int cmd_flags)
RB_CLEAR_NODE(&rq->rb_node);
rq->tag = -1;
rq->ref_count = 1;
+ rq->cmd = rq->__cmd;
}
EXPORT_SYMBOL(blk_init_rq);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 7121783..32ae32b 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 */
@@ -818,6 +819,13 @@ static inline void put_dev_sector(Sector p)
page_cache_release(p.v);
}
+static inline void rq_set_cmd(struct request *rq, unsigned char *cmd,
+ unsigned short cmd_len)
+{
+ rq->cmd = cmd;
+ rq->cmd_len = cmd_len;
+}
+
struct work_struct;
int kblockd_schedule_work(struct work_struct *work);
void kblockd_flush_work(struct work_struct *work);
--
1.5.3.3
--
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