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md: stop write should stop journal reclaim 

__md_stop_writes currently doesn't stop raid5-cache reclaim thread. It's
possible the reclaim thread is still running and doing write, which
doesn't match what __md_stop_writes should do. The extra ->quiesce()
call should not harm any raid types. For raid5-cache, this will
guarantee we reclaim all caches before we update superblock.

Signed-off-by: Shaohua Li <shli@fb.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Cc: Song Liu <songliubraving@fb.com>
This commit is contained in:
Shaohua Li 2016-11-21 10:29:19 -08:00
parent ce1ccd079f
commit 034e33f5ed
1 changed files with 4 additions and 0 deletions
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4
drivers/md/md.c
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@ -5517,6 +5517,10 @@ static void __md_stop_writes(struct mddev *mddev)
del_timer_sync(&mddev->safemode_timer);
if (mddev->pers && mddev->pers->quiesce) {
mddev->pers->quiesce(mddev, 1);
mddev->pers->quiesce(mddev, 0);
}
bitmap_flush(mddev);
if (mddev->ro == 0 &&