mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Eric Sandeen
50266c22dc
generic/085 was failing on a machine w/o devicemapper kernel support because it requires the linear target, but didn't explicitly test for it. I could have cut & pasted _require_dm_linear(), but chose to go the route of a generic helper, _require_dm_target $FOO, because some day someone will need the zero target, the error target, or who knows. Add the helper, use it in test generic/085, and convert _require_dm_flakey, _require_dm_snapshot, and _dmerror_required with this new helper. Reported-by: Angelo Dureghello <angelo.dureghello@nomovok.com> Signed-off-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
114 lines
3.5 KiB
Bash
Executable File
114 lines
3.5 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 057
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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 >> $seqres.full 2>&1
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_init_flakey
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_mount_flakey
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# Create our test file with some data.
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$XFS_IO_PROG -f -c "pwrite -S 0xaa -b 8K 0 8K" \
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$SCRATCH_MNT/foo | _filter_xfs_io
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# Make sure the file is durably persisted.
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sync
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# Append some data to our file, to increase its size.
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$XFS_IO_PROG -f -c "pwrite -S 0xcc -b 4K 8K 4K" \
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$SCRATCH_MNT/foo | _filter_xfs_io
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# Fsync the file, so from this point on if a crash/power failure happens, our
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# new data is guaranteed to be there next time the fs is mounted.
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$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foo
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# Add one hard link to our file. This made btrfs write into the in memory fsync
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# log a special inode with generation 0 and an i_size of 0 too. Note that this
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# didn't update the inode in the fsync log on disk.
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ln $SCRATCH_MNT/foo $SCRATCH_MNT/foo_link
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# Now make sure the in memory fsync log is durably persisted.
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# Creating and fsync'ing another file will do it.
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touch $SCRATCH_MNT/bar
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$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/bar
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# As expected, before the crash/power failure, we should be able to read the
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# 12Kb of file data.
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echo "File content before:"
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od -t x1 $SCRATCH_MNT/foo
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# Simulate a crash/power loss.
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_load_flakey_table $FLAKEY_DROP_WRITES
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_unmount_flakey
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_load_flakey_table $FLAKEY_ALLOW_WRITES
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_mount_flakey
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# After mounting the fs again, the fsync log was replayed.
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# The btrfs fsync log replay code didn't update the i_size of the persisted
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# inode because the inode item in the log had a special generation with a
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# value of 0 (and it couldn't know the correct i_size, since that inode item
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# had a 0 i_size too). This made the last 4Kb of file data inaccessible and
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# effectively lost.
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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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