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Date: Tue, 29 May 2018 00:35:41 +0800
From: Eryu Guan <guaneryu@...il.com>
To: Jan Kara <jack@...e.cz>
Cc: fstests@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Test for s_inodes_count overflow during fs resize
On Thu, May 24, 2018 at 08:31:40PM +0200, Jan Kara wrote:
> Test for overflow of s_inodes_count during filesystem resizing.
>
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
> common/config | 1 +
> common/rc | 7 ++++
> tests/ext4/033 | 118 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> tests/ext4/033.out | 6 +++
> tests/ext4/group | 1 +
> 5 files changed, 133 insertions(+)
> create mode 100755 tests/ext4/033
> create mode 100644 tests/ext4/033.out
>
> diff --git a/common/config b/common/config
> index fa07a6799824..659ebeed3ffc 100644
> --- a/common/config
> +++ b/common/config
> @@ -170,6 +170,7 @@ export INDENT_PROG="`set_prog_path indent`"
> export XFS_COPY_PROG="`set_prog_path xfs_copy`"
> export FSTRIM_PROG="`set_prog_path fstrim`"
> export DUMPE2FS_PROG="`set_prog_path dumpe2fs`"
> +export RESIZE2FS_PROG="`set_prog_path resize2fs`"
> export FIO_PROG="`set_prog_path fio`"
> export FILEFRAG_PROG="`set_prog_path filefrag`"
> export E4DEFRAG_PROG="`set_prog_path e4defrag`"
> diff --git a/common/rc b/common/rc
> index 7368e2e12988..b8aad429e153 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -3176,6 +3176,13 @@ _require_dumpe2fs()
> fi
> }
>
> +_require_resize2fs()
> +{
> + if [ -z "$RESIZE2FS_PROG" ]; then
> + _notrun "This test requires resize2fs utility."
> + fi
> +}
> +
I think this could simply be done by
_require_command "$RESIZE2FS_PROG" resize2fs
in the test.
And this could be added to other existing resize2fs tests too, e.g.
ext4/010, ext4/032 and ext4/306, and convert 'resize2fs' to
'$RESIZE2FS_PROG', in a follow-up patch.
> _require_ugid_map()
> {
> if [ ! -e /proc/self/uid_map ]; then
> diff --git a/tests/ext4/033 b/tests/ext4/033
> new file mode 100755
> index 000000000000..66760182e80f
> --- /dev/null
> +++ b/tests/ext4/033
> @@ -0,0 +1,118 @@
> +#! /bin/bash
> +# FS QA Test 033
> +#
> +# Test s_inodes_count overflow for huge filesystems. This bug was fixed
> +# by commit "ext4: Forbid overflowing inode count when resizing".
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2018 Jan Kara, SUSE. All Rights Reserved.
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program; if not, write the Free Software Foundation,
> +# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
> +#-----------------------------------------------------------------------
> +#
> +
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1 # failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> + _dmhugedisk_cleanup
> + # Recreate scratch so that _check_filesystems() does not complain
> + _scratch_mkfs >/dev/null 2>&1
This could be done by calling _require_scratch_nocheck, instead of
_require_scratch.
But I'm not sure why it's expected to leave a corrupted fs behind after?
> + cd /
> + rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +. ./common/dmhugedisk
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +_supported_fs ext4
> +_supported_os Linux
> +_require_scratch
> +_require_dmhugedisk
> +_require_dumpe2fs
> +_require_resize2fs
> +
> +# Figure out block size
> +echo "Figure out block size"
> +_scratch_mkfs >/dev/null 2>&1
> +_scratch_mount >> $seqres.full
> +
> +testdir=$SCRATCH_MNT/test-$seq
> +blksz="$(_get_block_size $SCRATCH_MNT)"
> +
> +umount $SCRATCH_MNT
_scratch_unmount
> +
> +INODES_PER_GROUP=$((blksz*8))
> +GROUP_BLOCKS=$((blksz*8))
> +
> +# Number of groups to overflow s_inodes_count
> +LIMIT_GROUPS=$(((1<<32)/INODES_PER_GROUP))
Use lower case for local variables?
> +
> +# Create device huge enough so that overflowing inode count is possible
> +echo "Format huge device"
> +_dmhugedisk_init $(((LIMIT_GROUPS + 16)*GROUP_BLOCKS*(blksz/512)))
I think we need to require a minimum size on SCRATCH_DEV too, otherwise
I got mkfs failure when testing with 1k block size on a 10G SCRATCH_DEV,
the backing device didn't have enough space to store the metadata.
After assigning a 25G device to SCRATCH_DEV, mkfs with 1k block size
passed, but test still failed in the end, I'm not sure what's going
wrong this time..
--- tests/ext4/033.out 2018-05-28 22:12:56.234867728 +0800
+++ /root/workspace/xfstests/results//ext4_1k/ext4/033.out.bad
2018-05-29 00:20:56.907283189 +0800
@@ -3,4 +3,4 @@
Format huge device
Resizing to inode limit + 1...
Resizing to max group count...
-Resizing device size...
+Resizing failed!
And dmesg showed:
[166934.718495] run fstests ext4/033 at 2018-05-29 00:07:04
[166937.651454] EXT4-fs (dm-2): mounted filesystem with ordered data mode. Opts: acl,user_xattr
[167629.640111] EXT4-fs (dm-11): mounted filesystem with ordered data mode. Opts: (null)
[167632.068897] EXT4-fs (dm-11): resizing filesystem from 4294836224 to 4294967296 blocks
[167632.069900] EXT4-fs warning (device dm-11): ext4_resize_fs:1937: resize would cause inodes_count overflow
[167765.672787] EXT4-fs (dm-11): resizing filesystem from 4294836224 to 4294959104 blocks
[167765.673573] EXT4-fs error (device dm-11): ext4_resize_fs:1950: comm resize2fs: resize_inode and meta_bg enabled simultaneously
[167766.005282] EXT4-fs warning (device dm-11): ext4_resize_begin:45: There are errors in the filesystem, so online resizing is not allowed
Tests with 2k/4k block sizes all passed.
Thanks,
Eryu
> +
> +# Start with small fs
> +GROUP_COUNT=$((LIMIT_GROUPS-16))
> +_mkfs_dev -N $((GROUP_COUNT*INODES_PER_GROUP)) -b $blksz \
> + $DMHUGEDISK_DEV $((GROUP_COUNT*GROUP_BLOCKS))
> +
> +_mount $DMHUGEDISK_DEV $SCRATCH_MNT
> +
> +echo "Initial fs dump" >> $seqres.full
> +$DUMPE2FS_PROG -h $DMHUGEDISK_DEV >> $seqres.full 2>&1
> +
> +# This should fail, s_inodes_count would just overflow!
> +echo "Resizing to inode limit + 1..."
> +$RESIZE2FS_PROG $DMHUGEDISK_DEV $((LIMIT_GROUPS*GROUP_BLOCKS)) >> $seqres.full 2>&1
> +if [ $? -eq 0 ]; then
> + echo "Resizing succeeded but it should fail!"
> + exit
> +fi
> +
> +# This should succeed, we are maxing out inodes
> +echo "Resizing to max group count..."
> +$RESIZE2FS_PROG $DMHUGEDISK_DEV $(((LIMIT_GROUPS-1)*GROUP_BLOCKS)) >> $seqres.full 2>&1
> +if [ $? -ne 0 ]; then
> + echo "Resizing failed!"
> + exit
> +fi
> +
> +echo "Fs dump after resize" >> $seqres.full
> +$DUMPE2FS_PROG -h $DMHUGEDISK_DEV >> $seqres.full 2>&1
> +
> +# This should fail, s_inodes_count would overflow by quite a bit!
> +echo "Resizing device size..."
> +$RESIZE2FS_PROG $DMHUGEDISK_DEV >> $seqres.full 2>&1
> +if [ $? -eq 0 ]; then
> + echo "Resizing succeeded but it should fail!"
> + exit
> +fi
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/ext4/033.out b/tests/ext4/033.out
> new file mode 100644
> index 000000000000..3b7c748c6994
> --- /dev/null
> +++ b/tests/ext4/033.out
> @@ -0,0 +1,6 @@
> +QA output created by 033
> +Figure out block size
> +Format huge device
> +Resizing to inode limit + 1...
> +Resizing to max group count...
> +Resizing device size...
> diff --git a/tests/ext4/group b/tests/ext4/group
> index 5bd15f82b3be..b850f568e674 100644
> --- a/tests/ext4/group
> +++ b/tests/ext4/group
> @@ -35,6 +35,7 @@
> 030 auto quick dax
> 031 auto quick dax
> 032 auto quick ioctl resize
> +033 auto ioctl resize
> 271 auto rw quick
> 301 aio auto ioctl rw stress defrag
> 302 aio auto ioctl rw stress defrag
> --
> 2.13.6
>
> --
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