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authorNeilBrown <neilb@suse.com>2015-09-24 07:00:51 +0300
committerNeilBrown <neilb@suse.com>2015-10-02 10:23:43 +0300
commit88724bfa68be792c1487d759e87568c36ac1a1cc (patch)
tree12cf787a5922610396529d90ae82ccaf223a57d9
parentbcee19f424a0d8c26ecf2607b73c690802658b29 (diff)
downloadlinux-88724bfa68be792c1487d759e87568c36ac1a1cc.tar.xz
md: wait for pending superblock updates before switching to read-only
If a superblock update is pending, wait for it to complete before letting md_set_readonly() switch to readonly. Otherwise we might lose important information about a device having failed. For external arrays, waiting for superblock updates can wait on user-space, so in that case, just return an error. Reported-and-tested-by: Shaohua Li <shli@fb.com> Signed-off-by: NeilBrown <neilb@suse.com>
-rw-r--r--drivers/md/md.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 4f5ecbe94ccb..b8247bc32cf6 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5409,9 +5409,13 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
* which will now never happen */
wake_up_process(mddev->sync_thread->tsk);
+ if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags))
+ return -EBUSY;
mddev_unlock(mddev);
wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
&mddev->recovery));
+ wait_event(mddev->sb_wait,
+ !test_bit(MD_CHANGE_PENDING, &mddev->flags));
mddev_lock_nointr(mddev);
mutex_lock(&mddev->open_mutex);