The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
19eb1650afeb ("dm thin: resume even if in FAIL mode")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 19eb1650afeb1aa86151f61900e9e5f1de5d8d02 Mon Sep 17 00:00:00 2001 From: Luo Meng luomeng12@huawei.com Date: Wed, 30 Nov 2022 10:09:45 +0800 Subject: [PATCH] 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 dc271c107fb5..196f82559ad6 100644 --- 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)