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dm mpath: use blk_mq_alloc_request() and blk_mq_free_request() directly 

There isn't any need to support both old .request_fn and blk-mq paths
in the blk-mq specific portion of __multipath_map().  Call
blk_mq_alloc_request() directly rather than use blk_get_request().

Similarly, call blk_mq_free_request(), rather than blk_put_request(), in
multipath_release_clone().

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2016-01-31 17:38:28 -05:00
parent 2eff1924e1
commit 78ce23b518
1 changed files with 4 additions and 3 deletions
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7
drivers/md/dm-mpath.c
View File

@ -23,6 +23,7 @@
#include <linux/delay.h>
#include <scsi/scsi_dh.h>
#include <linux/atomic.h>
#include <linux/blk-mq.h>
#define DM_MSG_PREFIX "multipath"
#define DM_PG_INIT_DELAY_MSECS 2000
@ -452,8 +453,8 @@ static int __multipath_map(struct dm_target *ti, struct request *clone,
* .request_fn stacked on blk-mq path(s) and
* blk-mq stacked on blk-mq path(s).
*/
*__clone = blk_get_request(bdev_get_queue(bdev),
rq_data_dir(rq), GFP_ATOMIC);
*__clone = blk_mq_alloc_request(bdev_get_queue(bdev),
rq_data_dir(rq), BLK_MQ_REQ_NOWAIT);
if (IS_ERR(*__clone)) {
/* ENOMEM, requeue */
clear_request_fn_mpio(m, map_context);
@ -491,7 +492,7 @@ static int multipath_clone_and_map(struct dm_target *ti, struct request *rq,
static void multipath_release_clone(struct request *clone)
{
blk_put_request(clone);
blk_mq_free_request(clone);
}
/*