raid5-cache: correct condition for empty metadata write

As long as we recover one metadata block, we should write the empty metadata
write. The original code could make recovery corrupted if only one meta is
valid.

Reported-by: Zhengyuan Liu <liuzhengyuan@kylinos.cn>
Signed-off-by: Shaohua Li <shli@fb.com>

diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 981f85515191e338550e38e66404f91859694ea5..a227a9f3ee6556b1af15223080e791fda7817989 100644 (file)
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -1087,7 +1087,7 @@ static int r5l_recovery_log(struct r5l_log *log)
         * 1's seq + 10 and let superblock points to meta2. The same recovery will
         * not think meta 3 is a valid meta, because its seq doesn't match
         */
-       if (ctx.seq > log->last_cp_seq + 1) {
+       if (ctx.seq > log->last_cp_seq) {
                int ret;
 
                ret = r5l_log_write_empty_meta_block(log, ctx.pos, ctx.seq + 10);