4 # Regression test for an XFS multi-block buffer logging bug.
6 # The XFS bug results in a panic when a non-contiguous multi-block buffer is
7 # mapped and logged in a particular manner, such that only regions beyond the
8 # first fsb-sized mapping are logged. The crash occurs asynchronous to
9 # transaction submission, when the associated buffer log item is pushed from the
10 # CIL (i.e., when the log is subsequently flushed).
12 #-----------------------------------------------------------------------
13 # Copyright (c) 2016 Red Hat, Inc. All Rights Reserved.
15 # This program is free software; you can redistribute it and/or
16 # modify it under the terms of the GNU General Public License as
17 # published by the Free Software Foundation.
19 # This program is distributed in the hope that it would be useful,
20 # but WITHOUT ANY WARRANTY; without even the implied warranty of
21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 # GNU General Public License for more details.
24 # You should have received a copy of the GNU General Public License
25 # along with this program; if not, write the Free Software Foundation,
26 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
27 #-----------------------------------------------------------------------
31 seqres=$RESULT_DIR/$seq
32 echo "QA output created by $seq"
36 status=1 # failure is the default!
37 trap "_cleanup; exit \$status" 0 1 2 3 15
45 # get standard environment, filters and checks
48 # Modify as appropriate.
52 _require_scratch_nocheck # check complains about single AG fs
53 _require_xfs_io_command "fpunch"
54 _require_command $UUIDGEN_PROG uuidgen
58 # Create a small fs with a large directory block size. We want to fill up the fs
59 # quickly and then create multi-fsb dirblocks over fragmented free space.
60 _scratch_mkfs_xfs -d size=20m -n size=64k >> $seqres.full 2>&1
63 # Fill a source directory with many largish-named files. 1k uuid-named entries
64 # sufficiently populates a 64k directory block.
65 mkdir $SCRATCH_MNT/src
66 for i in $(seq 0 1023); do
67 touch $SCRATCH_MNT/src/`$UUIDGEN_PROG`
70 # precreate target dirs while we still have free space for inodes
71 for i in $(seq 0 3); do
75 # consume and fragment free space
76 $XFS_IO_PROG -xc "resblks 16" $SCRATCH_MNT >> $seqres.full 2>&1
77 dd if=/dev/zero of=$SCRATCH_MNT/file bs=4k >> $seqres.full 2>&1
78 $XFS_IO_PROG -c "fsync" $SCRATCH_MNT/file >> $seqres.full 2>&1
79 size=`stat -c %s $SCRATCH_MNT/file`
80 for i in $(seq 0 8192 $size); do
81 $XFS_IO_PROG -c "fpunch $i 4k" $SCRATCH_MNT/file >> $seqres.full 2>&1
84 # Replicate the src dir several times into fragmented free space. After one or
85 # two dirs, we should have nothing but non-contiguous directory blocks.
86 for d in $(seq 0 3); do
87 for f in `ls -1 $SCRATCH_MNT/src`; do
88 ln $SCRATCH_MNT/src/$f $SCRATCH_MNT/$d/$f
92 # Fragment the target dirs a bit. Remove a handful of entries from each to
93 # populate the best free space regions in the directory block headers. We want
94 # to populate these now so the subsequent unlinks have no reason to log the
95 # first block of the directory.
96 for d in $(seq 0 3); do
98 for f in `ls -U $SCRATCH_MNT/$d`; do
100 unlink $SCRATCH_MNT/$d/$f
106 # remount to flush and ensure subsequent operations allocate a new log item
109 # Unlink an entry towards the end of each dir and fsync. The unlink should only
110 # need to log the latter mappings of the 64k directory block. If the logging bug
111 # is present, this will crash!
112 for d in $(seq 0 3); do
113 f=`ls -U $SCRATCH_MNT/$d | tail -10 | head -n 1`
114 unlink $SCRATCH_MNT/$d/$f
115 $XFS_IO_PROG -c fsync $SCRATCH_MNT/$d
118 echo Silence is golden.