dm thin: resume even if in FAIL mode

If a thinpool set fail_io while suspending, resume will fail with:
 device-mapper: resume ioctl on vg-thinpool  failed: Invalid argument

The thin-pool also can't be removed if an in-flight bio is in the
deferred list.

This can be easily reproduced using:

  echo "offline" > /sys/block/sda/device/state
  dd if=/dev/zero of=/dev/mapper/thin bs=4K count=1
  dmsetup suspend /dev/mapper/pool
  mkfs.ext4 /dev/mapper/thin
  dmsetup resume /dev/mapper/pool

The root cause is maybe_resize_data_dev() will check fail_io and return
error before called dm_resume.

Fix this by adding FAIL mode check at the end of pool_preresume().

Cc: stable@vger.kernel.org
Fixes: da105ed5fd7e ("dm thin metadata: introduce dm_pool_abort_metadata")
Signed-off-by: Luo Meng <luomeng12@huawei.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index dc271c107fb51b0a4c9dc4651dcb90f0049a18d7..196f82559ad6b97155c0a069fa968322fe07a1d6 100644 (file)
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -3542,20 +3542,28 @@ static int pool_preresume(struct dm_target *ti)
         */
        r = bind_control_target(pool, ti);
        if (r)
-               return r;
+               goto out;
 
        r = maybe_resize_data_dev(ti, &need_commit1);
        if (r)
-               return r;
+               goto out;
 
        r = maybe_resize_metadata_dev(ti, &need_commit2);
        if (r)
-               return r;
+               goto out;
 
        if (need_commit1 || need_commit2)
                (void) commit(pool);
+out:
+       /*
+        * When a thin-pool is PM_FAIL, it cannot be rebuilt if
+        * bio is in deferred list. Therefore need to return 0
+        * to allow pool_resume() to flush IO.
+        */
+       if (r && get_pool_mode(pool) == PM_FAIL)
+               r = 0;
 
-       return 0;
+       return r;
 }
 
 static void pool_suspend_active_thins(struct pool *pool)