linux-ext4 - Re: Weird resize2fs failures when mounting ext3 as ext4

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Date:	Sun, 21 Apr 2013 20:38:14 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>
CC:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Weird resize2fs failures when mounting ext3 as ext4

On 4/21/13 6:30 PM, Theodore Ts'o wrote:
> On Mon, Feb 18, 2013 at 03:41:11PM -0600, Eric Sandeen wrote:
>> Can't remember how I stumbled on this testcase, but mounting
>> an ext3 filesystem with "-t ext4" and then resizing leads to trouble.
> 
> Is there a bugzilla entry for this?  I found the problem and a fix;
> patch follows in a moment.

Sorry, I took a look and I think I failed to file a bug.

> Also, here's a simplified repro that doesn't require LVM.  The bug was
> introduced in commit fb0a387dcdc, so it goes back to 2.6.32.

Argh.  Karma!  Sorry about that, and thanks for taking a look.

-Eric

> It only
> affects block allocations for files that aren't extent mapped, and is
> caused by the fact that the online resizer wasn't updating
> s_blockfile_groups (which was introduced in commit fb0a387dcdc).
> 
> 						- Ted
> 
> #!/bin/bash
> 
> COUNT=15
> SIZE_1=15G
> SIZE_2=16G
> DEVICE=/dev/vdc
> XFS_IO=/root/xfstests/bin/xfs_io
> 
> mkdir -p mnt
> umount mnt &>/dev/null
> mkfs.ext3  $DEVICE $SIZE_1
> mount -t ext4 -o nodelalloc $DEVICE mnt/
> 
> for I in `seq 1 $COUNT`; do mkdir mnt/dir$I; dd if=/dev/zero of=mnt/dir$I/file$I bs=1M count=1024; done
> echo "before growing:"
> df mnt/
> 
> umount mnt
> mount -t ext4 -o nodelalloc $DEVICE mnt/
> 
> echo "growing:"
> #export RESIZE2FS_KERNEL_VERSION=3.2.0
> strace -o /tmp/resize2fs.strace resize2fs $DEVICE $SIZE_2
> 
> echo "done growing:"
> df mnt/
> 
> # This gets ENOSPC for all of them
> echo "try extending files:"
> for I in `seq 1 $COUNT`; do $XFS_IO -f -F -c "pwrite -b 4m 1G 50m" mnt/dir$I/file$I; done 
> df mnt/
> 
> umount mnt
> 
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