block: add blk_rq_set_block_pc()
With the optimizations around not clearing the full request at alloc
time, we are leaving some of the needed init for REQ_TYPE_BLOCK_PC
up to the user allocating the request.
Add a blk_rq_set_block_pc() that sets the command type to
REQ_TYPE_BLOCK_PC, and properly initializes the members associated
with this type of request. Update callers to use this function instead
of manipulating rq->cmd_type directly.
Includes fixes from Christoph Hellwig <hch@lst.de> for my half-assed
attempt.
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 9c28a5b..14695c6 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -229,7 +229,6 @@
* fill in request structure
*/
rq->cmd_len = hdr->cmd_len;
- rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->timeout = msecs_to_jiffies(hdr->timeout);
if (!rq->timeout)
@@ -311,6 +310,7 @@
rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
if (!rq)
return -ENOMEM;
+ blk_rq_set_block_pc(rq);
if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
blk_put_request(rq);
@@ -491,7 +491,7 @@
memset(sense, 0, sizeof(sense));
rq->sense = sense;
rq->sense_len = 0;
- rq->cmd_type = REQ_TYPE_BLOCK_PC;
+ blk_rq_set_block_pc(rq);
blk_execute_rq(q, disk, rq, 0);
@@ -524,7 +524,7 @@
int err;
rq = blk_get_request(q, WRITE, __GFP_WAIT);
- rq->cmd_type = REQ_TYPE_BLOCK_PC;
+ blk_rq_set_block_pc(rq);
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
rq->cmd[0] = cmd;
rq->cmd[4] = data;