diff options
| author | Mike Snitzer <snitzer@redhat.com> | 2016-02-20 14:02:49 -0500 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2016-02-22 22:33:46 -0500 |
| commit | c5248f79f39e5254977a3916b2149c3ccffa2722 (patch) | |
| tree | bd8a3e1663a3596d88461be3a731ac060f65e345 /drivers/md/dm-mpath.c | |
| parent | 818c5f3bef750eb5998b468f84391e4d656b97ed (diff) | |
dm: remove support for stacking dm-mq on .request_fn device(s)
Remove all fiddley code that propped up this support for a blk-mq
request-queue ontop of all .request_fn devices.
Testing has proven this niche request-based dm-mq mode to be buggy, when
testing fault tolerance with DM multipath, and there is no point trying
to preserve it.
Should help improve efficiency of pure dm-mq code and make code
maintenance less delicate.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-mpath.c')
| -rw-r--r-- | drivers/md/dm-mpath.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index 3ddaa11584ef..7259eeba6a58 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -418,7 +418,10 @@ static int __multipath_map(struct dm_target *ti, struct request *clone, spin_unlock_irq(&m->lock); if (clone) { - /* Old request-based interface: allocated clone is passed in */ + /* + * Old request-based interface: allocated clone is passed in. + * Used by: .request_fn stacked on .request_fn path(s). + */ clone->q = bdev_get_queue(bdev); clone->rq_disk = bdev->bd_disk; clone->cmd_flags |= REQ_FAILFAST_TRANSPORT; |