ACK: [Pull Request] [kinetic/linux] Regression in ext4 during online resize

[Khaled Elmously]

Acked-by: Khalid Elmously <khalid.elmously at canonical.com>


On 2023-03-22 11:07:08 , Tim Gardner wrote:
> BugLink: https://bugs.launchpad.net/bugs/2003816
> 
> Issue
> 
> resize2fs utility is used to resize the filesystem and is idempotent in
> nature. But in the 5.15 kernel, successive execution of resize2fs is
> returning error.
> 
> Reproduction step (on AWS):
> 
>     Create an AWS instance with AMI ami-056a67ea1b8ffa0fc (Linux
> 5.15.0-1022-aws) in us-west-2 region and attach an EBS volume.
>     Format and mount the disk - sudo mkfs.ext4 /dev/xvdb, sudo mkdir -p
> /mnt/ssd0, sudo mount /dev/xvdb /mnt/ssd0
>     Increase the size of EBS volume.
>     Run sudo resize2fs /dev/xvdb multiple times.
> 
> The first execution returns -
> 
> $ sudo resize2fs /dev/xvdb
> resize2fs 1.45.5 (07-Jan-2020)
> Filesystem at /dev/xvdb is mounted on /mnt/ssd0; on-line resizing required
> old_desc_blocks = 2, new_desc_blocks = 3
> The filesystem on /dev/xvdb is now 5242880 (4k) blocks long.
> 
> The following execution returns -
> 
> $ sudo resize2fs /dev/xvdb
> resize2fs 1.45.5 (07-Jan-2020)
> The filesystem is already 5242880 (4k) blocks long. Nothing to do!
> 
> When you run the same step on the latest image ami-0a1d6d351894df6cc (Linux
> 5.15.0-1026-aws).
> 
> The first execution returns -
> 
> $ sudo resize2fs /dev/xvdb
> resize2fs 1.45.5 (07-Jan-2020)
> Filesystem at /dev/xvdb is mounted on /mnt/ssd0; on-line resizing required
> old_desc_blocks = 2, new_desc_blocks = 3
> The filesystem on /dev/xvdb is now 5242880 (4k) blocks long.
> 
> The following execution returns
> 
> $ sudo resize2fs /dev/xvdb
> resize2fs 1.45.5 (07-Jan-2020)
> resize2fs: Superblock checksum does not match superblock while trying to
> open /dev/xvdb
> Couldn't find valid filesystem superblock.
> 
> 
> This issue has been noted to affect 5.19 kernels as well. A patch set from
> 5.15.y has been used as a guide for which cherry
> picks to commit.
> 
> ------------------------------------------------------------------------
> 
> The following changes since commit 78d54428f16c98b741b3190f1c3f6b0ef0430b3e:
> 
>   UBUNTU: Ubuntu-5.19.0-39.40 (2023-03-21 09:35:41 -0700)
> 
> are available in the Git repository at:
> 
>   git://git.launchpad.net/~timg-tpi/ubuntu/+source/linux/+git/kinetic
> lp2003816
> 
> for you to fetch changes up to 4b2b6db116cb58b1f0b03db33063e74a72771c49:
> 
>   ext4: fix corrupt backup group descriptors after online resize (2023-03-22
> 10:32:43 -0600)
> 
> ----------------------------------------------------------------
> Baokun Li (3):
>       ext4: fix bad checksum after online resize
>       ext4: fix corruption when online resizing a 1K bigalloc fs
>       ext4: fix corrupt backup group descriptors after online resize
> 
>  fs/ext4/resize.c | 32 ++++++++++++++++++++------------
>  1 file changed, 20 insertions(+), 12 deletions(-)
> -- 
> -----------
> Tim Gardner
> Canonical, Inc
> 
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