]> git.baikalelectronics.ru Git - kernel.git/commit
dm: make flush bios explicitly sync
authorJan Kara <jack@suse.cz>
Wed, 31 May 2017 07:44:32 +0000 (09:44 +0200)
committerMike Snitzer <snitzer@redhat.com>
Wed, 31 May 2017 14:50:23 +0000 (10:50 -0400)
commit85572e259c5d23522c7cbb3894323cbeba3b1ebf
treedf6bce75c164f09c052d464bfbf4d2ba7f44797e
parent93449e31838c5b2a572f3378eb963c5709317fad
dm: make flush bios explicitly sync

Commit 8eecb540590c ("block: treat REQ_FUA and REQ_PREFLUSH as
synchronous") removed REQ_SYNC flag from WRITE_{FUA|PREFLUSH|...}
definitions.  generic_make_request_checks() however strips REQ_FUA and
REQ_PREFLUSH flags from a bio when the storage doesn't report volatile
write cache and thus write effectively becomes asynchronous which can
lead to performance regressions.

Fix the problem by making sure all bios which are synchronous are
properly marked with REQ_SYNC.

Fixes: 8eecb540590c ("block: treat REQ_FUA and REQ_PREFLUSH as synchronous")
Cc: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
drivers/md/dm-bufio.c
drivers/md/dm-integrity.c
drivers/md/dm-raid1.c
drivers/md/dm-snap-persistent.c
drivers/md/dm.c