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Theodore Ts'o
56ff01f471
The check script requires that it be run as root, so adding individualized checks for this in each teat is not needed. Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
127 lines
4.1 KiB
Bash
Executable File
127 lines
4.1 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 041
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#
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# This test is motivated by an fsync issue discovered in btrfs.
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# The steps to trigger the issue were:
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#
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# 1) remove an hard link from an inode with a large number of hard links;
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# 2) add a new hard link;
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# 3) add another hard link with the same name as the one removed in step 1;
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# 4) fsync the inode.
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#
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# These steps made the btrfs fsync log replay fail (with the -EOVERFLOW error),
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# making the filesystem unmountable, requiring the use of btrfs-zero-log (it
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# wipes the fsync log) in order to make the filesystem mountable again (but
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# losing some data/metadata).
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#
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# The btrfs issue was fixed by the following linux kernel patches:
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#
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# Btrfs: fix fsync when extend references are added to an inode
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# Btrfs: fix fsync log replay for inodes with a mix of regular refs and extrefs
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#
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# This issue was present in btrfs since the extrefs (extend references)
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# feature was added (2012).
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#
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#-----------------------------------------------------------------------
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# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
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# Author: Filipe Manana <fdmanana@suse.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_flakey
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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. ./common/dmflakey
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# real QA test starts here
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_supported_fs generic
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_supported_os Linux
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_require_scratch
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_require_dm_target flakey
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_require_metadata_journaling $SCRATCH_DEV
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rm -f $seqres.full
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# If the test filesystem is btrfs, make sure we create a filesystem with
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# the extend references (extrefs) feature enabled (it's enabled by default
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# in recent versions of btrfs-progs).
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if [ "$FSTYP" = "btrfs" ]; then
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_scratch_mkfs "-O extref" >> $seqres.full 2>&1
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else
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_scratch_mkfs >> $seqres.full 2>&1
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fi
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_init_flakey
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_mount_flakey
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# Create a test file with 3001 hard links. This number is large enough to
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# make btrfs start using extrefs at some point even if the fs has the maximum
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# possible leaf/node size (64Kb).
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echo "hello world" > $SCRATCH_MNT/foo
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for i in `seq 1 3000`; do
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ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link_`printf "%04d" $i`
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done
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# Make sure all metadata and data are durably persisted.
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sync
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# Now remove one link, add a new one with a new name, add another new one with
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# the same name as the one we just removed and fsync the inode.
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rm -f $SCRATCH_MNT/foo_link_0001
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ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link_3001
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ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link_0001
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rm -f $SCRATCH_MNT/foo_link_0002
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ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link_3002
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ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link_3003
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$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foo
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_flakey_drop_and_remount
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# Check that the number of hard links is correct, we are able to remove all
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# the hard links and read the file's data. This is just to verify we don't
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# get stale file handle errors (due to dangling directory index entries that
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# point to inodes that no longer exist).
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echo "Link count: $(stat -c %h $SCRATCH_MNT/foo)"
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[ -f $SCRATCH_MNT/foo ] || echo "Link foo is missing"
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for ((i = 1; i <= 3003; i++)); do
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name=foo_link_`printf "%04d" $i`
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if [ $i -eq 2 ]; then
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[ -f $SCRATCH_MNT/$name ] && echo "Link $name found"
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else
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[ -f $SCRATCH_MNT/$name ] || echo "Link $name is missing"
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fi
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done
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rm -f $SCRATCH_MNT/foo_link_*
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cat $SCRATCH_MNT/foo
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rm -f $SCRATCH_MNT/foo
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status=0
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exit
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