]> git.baikalelectronics.ru Git - kernel.git/commit
md: Make flush bios explicitely sync
authorJan Kara <jack@suse.cz>
Wed, 31 May 2017 07:44:33 +0000 (09:44 +0200)
committerShaohua Li <shli@fb.com>
Wed, 31 May 2017 16:25:53 +0000 (09:25 -0700)
commit2e4ae938f101362c59bc06413c0a759063adb79c
tree7e44dac2d01cddccb74415a51d3df9a45d913502
parent92f6d1aaccc280385ad520cecf1bf89c7c25ebfc
md: Make flush bios explicitely 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.

CC: linux-raid@vger.kernel.org
CC: Shaohua Li <shli@kernel.org>
Fixes: 8eecb540590c70d97c0366ea02a6a436c87fa8ef
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Shaohua Li <shli@fb.com>
drivers/md/md.c
drivers/md/raid5-cache.c
drivers/md/raid5-ppl.c