[PATCH v2] md: prevent incorrect update of resync/recovery offset

[PATCH v2] md: prevent incorrect update of resync/recovery offset

[linan666]

From: Li Nan <linan122@huawei.com>

In md_do_sync(), when md_sync_action returns ACTION_FROZEN, subsequent
call to md_sync_position() will return MaxSector. This causes
'curr_resync' (and later 'recovery_offset') to be set to MaxSector too,
which incorrectly signals that recovery/resync has completed, even though
disk data has not actually been updated.

To fix this issue, skip updating any offset values when the sync action
is FROZEN. The same holds true for IDLE.

Fixes: 7d9f107a4e94 ("md: use new helpers in md_do_sync()")
Signed-off-by: Li Nan <linan122@huawei.com>
---
v2: fix typo.

 drivers/md/md.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index e78f80d39271..6828a569e819 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -9397,6 +9397,9 @@ void md_do_sync(struct md_thread *thread)
 	}
 
 	action = md_sync_action(mddev);
+	if (action == ACTION_FROZEN || action == ACTION_IDLE)
+		goto skip;
+
 	desc = md_sync_action_name(action);
 	mddev->last_sync_action = action;
 
-- 
2.39.2