4 # Make some pages/extents of a file dirty, do a ranged fsync that covers
5 # only some of the dirty pages/extents, and then do a regular fsync (or
6 # another ranged fsync that covers the remaining dirty pages/extents).
7 # Verify after that all extents were persisted.
9 # This test is motivated by a btrfs issue where the first ranged fsync
10 # would prevent the following fsync from persisting the remaining dirty
11 # pages/extents. This was fixed by the following btrfs kernel patch:
13 # Btrfs: fix fsync data loss after a ranged fsync
15 #-----------------------------------------------------------------------
16 # Copyright (C) 2014 SUSE Linux Products GmbH. All Rights Reserved.
17 # Author: Filipe Manana <fdmanana@suse.com>
19 # This program is free software; you can redistribute it and/or
20 # modify it under the terms of the GNU General Public License as
21 # published by the Free Software Foundation.
23 # This program is distributed in the hope that it would be useful,
24 # but WITHOUT ANY WARRANTY; without even the implied warranty of
25 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 # GNU General Public License for more details.
28 # You should have received a copy of the GNU General Public License
29 # along with this program; if not, write the Free Software Foundation,
30 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
31 #-----------------------------------------------------------------------
35 seqres=$RESULT_DIR/$seq
36 echo "QA output created by $seq"
39 status=1 # failure is the default!
45 trap "_cleanup; exit \$status" 0 1 2 3 15
47 # get standard environment, filters and checks
52 # real QA test starts here
56 _require_dm_target flakey
57 _require_metadata_journaling $SCRATCH_DEV
61 _scratch_mkfs >> $seqres.full 2>&1
66 # Create the file first.
67 $XFS_IO_PROG -f -c "pwrite -S 0xff 0 256K" $SCRATCH_MNT/foo | _filter_xfs_io
69 # Now sync the file data to disk using 'sync' and not an fsync. This is because
70 # in btrfs the first fsync clears the btrfs inode full fsync flag, which must
71 # be set when the first msync below happens in order to trigger the bug.
74 # Now update the first 4Kb and the last 4Kb of the file, using memory mapped IO
75 # because an msync(), since the linux kernel commit
76 # 7fc34a62ca4434a79c68e23e70ed26111b7a4cf8, invokes a ranged fsync.
78 # After those writes, msync a range covering the first 4Kb and then after
79 # perform a msync with a range covering the last 4Kb of the file.
80 # This second msync() used to be a no-op for that btrfs bug (and the first fsync
81 # didn't log the last 4Kb extent as expected too).
84 -c "mwrite -S 0xaa 0 4K" \
85 -c "mwrite -S 0xbb 252K 4K" \
86 -c "msync -s 0K 64K" \
87 -c "msync -s 192K 64K" \
89 $SCRATCH_MNT/foo | _filter_xfs_io
91 echo "File content before crash/reboot:"
92 od -t x1 $SCRATCH_MNT/foo
94 _flakey_drop_and_remount
96 echo "File content after crash/reboot and fs mount:"
97 od -t x1 $SCRATCH_MNT/foo