2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2016 Red Hat, Inc. All Rights Reserved.
7 # Regression test for an XFS multi-block buffer logging bug.
9 # The XFS bug results in a panic when a non-contiguous multi-block buffer is
10 # mapped and logged in a particular manner, such that only regions beyond the
11 # first fsb-sized mapping are logged. The crash occurs asynchronous to
12 # transaction submission, when the associated buffer log item is pushed from the
13 # CIL (i.e., when the log is subsequently flushed).
16 seqres=$RESULT_DIR/$seq
17 echo "QA output created by $seq"
21 status=1 # failure is the default!
22 trap "_cleanup; exit \$status" 0 1 2 3 15
30 # get standard environment, filters and checks
33 # Modify as appropriate.
36 _require_scratch_nocheck # check complains about single AG fs
37 _require_xfs_io_command "fpunch"
38 _require_command $UUIDGEN_PROG uuidgen
42 # Disable the scratch rt device to avoid test failures relating to the rt
43 # bitmap consuming all the free space in our small data device.
46 # Create a small fs with a large directory block size. We want to fill up the fs
47 # quickly and then create multi-fsb dirblocks over fragmented free space.
48 _scratch_mkfs_xfs -d size=20m -n size=64k >> $seqres.full 2>&1
51 # Fill a source directory with many largish-named files. 1k uuid-named entries
52 # sufficiently populates a 64k directory block.
53 mkdir $SCRATCH_MNT/src
54 for i in $(seq 0 1023); do
55 touch $SCRATCH_MNT/src/`$UUIDGEN_PROG`
58 # precreate target dirs while we still have free space for inodes
59 for i in $(seq 0 3); do
63 # consume and fragment free space
64 $XFS_IO_PROG -xc "resblks 16" $SCRATCH_MNT >> $seqres.full 2>&1
65 dd if=/dev/zero of=$SCRATCH_MNT/file bs=4k >> $seqres.full 2>&1
66 $XFS_IO_PROG -c "fsync" $SCRATCH_MNT/file >> $seqres.full 2>&1
67 size=`_get_filesize $SCRATCH_MNT/file`
68 for i in $(seq 0 8192 $size); do
69 $XFS_IO_PROG -c "fpunch $i 4k" $SCRATCH_MNT/file >> $seqres.full 2>&1
72 # Replicate the src dir several times into fragmented free space. After one or
73 # two dirs, we should have nothing but non-contiguous directory blocks.
74 for d in $(seq 0 3); do
75 for f in `ls -1 $SCRATCH_MNT/src`; do
76 ln $SCRATCH_MNT/src/$f $SCRATCH_MNT/$d/$f
80 # Fragment the target dirs a bit. Remove a handful of entries from each to
81 # populate the best free space regions in the directory block headers. We want
82 # to populate these now so the subsequent unlinks have no reason to log the
83 # first block of the directory.
84 for d in $(seq 0 3); do
86 for f in `ls -U $SCRATCH_MNT/$d`; do
88 unlink $SCRATCH_MNT/$d/$f
94 # remount to flush and ensure subsequent operations allocate a new log item
97 # Unlink an entry towards the end of each dir and fsync. The unlink should only
98 # need to log the latter mappings of the 64k directory block. If the logging bug
99 # is present, this will crash!
100 for d in $(seq 0 3); do
101 f=`ls -U $SCRATCH_MNT/$d | tail -10 | head -n 1`
102 unlink $SCRATCH_MNT/$d/$f
103 $XFS_IO_PROG -c fsync $SCRATCH_MNT/$d
106 echo Silence is golden.