On 08/31/2018 10:28 PM, Amir Goldstein wrote:
[switching over to ext4 list]
On Fri, Aug 31, 2018 at 5:19 PM cgxu519 <cgxu519@xxxxxxx> wrote:
Hi Amir,
It seems godown will cause side effect on ext4/tune2fs, mount an ext4
filesystem after running godown,
then tune2fs -l <dev> complains like below. so definitely it will not
pass d_type check.
[root@x201 xfstests-dev]# tune2fs -l /dev/mapper/test-test1
tune2fs 1.44.2 (14-May-2018)
tune2fs: Superblock checksum does not match superblock while trying to
open /dev/mapper/test-test1
Couldn't find valid filesystem superblock.
Chengguang,
Bringing this to the attention of ext4 developers,
can you please re-iterate the reproducer (without the mention of
overlayfs and genereic/474) to demonstrate the problem.
steps to reproduce:
1) mount an ext4 fs
2) write a file in the fs
3) sync / or do nothing
4) running godown tool in xfstest to the fs
5) umount the fs
6) mount the fs
7) tune2fs -l <dev>
tune2fs -l will fail with below error.
[root@x201 xfstests-dev]# tune2fs -l /dev/mapper/test-test1
tune2fs 1.44.2 (14-May-2018)
tune2fs: Superblock checksum does not match superblock while trying to
open /dev/mapper/test-test1
Couldn't find valid filesystem superblock.
If I do not write any file in (2), then tune2fs -l in (7) will finish
successfully.
If I run tune2fs -l during (4) and (5) or during (5) and (6) also finish
successfully.
NOTE, I don't know this is a real issue or just by design.
Thanks,
Chengguang
