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https://github.com/linux-apfs/apfstests.git
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Filipe Manana
1a22b6820e
To avoid having many tests repeating the following pattern:
_load_flakey_table $FLAKEY_DROP_WRITES
_unmount_flakey
_load_flakey_table $FLAKEY_ALLOW_WRITES
_mount_flakey
add the helper function _flakey_drop_and_remount to remove
the existing duplicated code and serve as a shortcut.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
96 lines
2.9 KiB
Bash
Executable File
96 lines
2.9 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 056
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#
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# This test is motivated by an fsync issue discovered in btrfs.
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# The issue was that we could lose file data, that was previously fsync'ed
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# successfully, if we end up adding a hard link to our inode and then persist
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# the fsync log later via an fsync of other inode for example.
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#
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# The btrfs issue was fixed by the following linux kernel patch:
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#
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# Btrfs: fix fsync data loss after adding hard link to inode
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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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rm -f $tmp.*
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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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_need_to_be_root
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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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_scratch_mkfs >> $seqres.full 2>&1
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_init_flakey
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_mount_flakey
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# Create one file with data and fsync it.
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# This made the btrfs fsync log persist the data and the inode metadata with
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# a correct inode->i_size (4096 bytes).
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$XFS_IO_PROG -f -c "pwrite -S 0xaa -b 4K 0 4K" -c "fsync" \
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$SCRATCH_MNT/foo | _filter_xfs_io
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# Now add one hard link to our file. This made the btrfs code update the fsync
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# log, in memory only, with an inode metadata having a size of 0.
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ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link
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# Now force persistence of the fsync log to disk, for example, by fsyncing some
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# other file.
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touch $SCRATCH_MNT/bar
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$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/bar
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# Before a power loss or crash, we could read the 4Kb of data from our file as
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# expected.
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echo "File content before:"
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od -t x1 $SCRATCH_MNT/foo
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_flakey_drop_and_remount
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# After the fsync log replay, because the fsync log had a value of 0 for our
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# inode's i_size, we couldn't read anymore the 4Kb of data that we previously
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# wrote and fsync'ed. The size of the file became 0 after the fsync log replay.
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echo "File content after:"
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od -t x1 $SCRATCH_MNT/foo
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status=0
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exit
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