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>
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 @@
/*
* 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 */