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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: da105ed5fd ("dm thin metadata: introduce dm_pool_abort_metadata")
Signed-off-by: Luo Meng <luomeng12@huawei.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Luo Meng 2022-11-30 10:09:45 +08:00 committed by Mike Snitzer
parent 6b9973861c
commit 19eb1650af
1 changed files with 12 additions and 4 deletions
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16
drivers/md/dm-thin.c
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@ -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)