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.
37 _require_scratch_nocheck # check complains about single AG fs
38 _require_xfs_io_command "fpunch"
39 _require_command $UUIDGEN_PROG uuidgen
43 # Create a small fs with a large directory block size. We want to fill up the fs
44 # quickly and then create multi-fsb dirblocks over fragmented free space.
45 _scratch_mkfs_xfs -d size=20m -n size=64k >> $seqres.full 2>&1
48 # Fill a source directory with many largish-named files. 1k uuid-named entries
49 # sufficiently populates a 64k directory block.
50 mkdir $SCRATCH_MNT/src
51 for i in $(seq 0 1023); do
52 touch $SCRATCH_MNT/src/`$UUIDGEN_PROG`
55 # precreate target dirs while we still have free space for inodes
56 for i in $(seq 0 3); do
60 # consume and fragment free space
61 $XFS_IO_PROG -xc "resblks 16" $SCRATCH_MNT >> $seqres.full 2>&1
62 dd if=/dev/zero of=$SCRATCH_MNT/file bs=4k >> $seqres.full 2>&1
63 $XFS_IO_PROG -c "fsync" $SCRATCH_MNT/file >> $seqres.full 2>&1
64 size=`_get_filesize $SCRATCH_MNT/file`
65 for i in $(seq 0 8192 $size); do
66 $XFS_IO_PROG -c "fpunch $i 4k" $SCRATCH_MNT/file >> $seqres.full 2>&1
69 # Replicate the src dir several times into fragmented free space. After one or
70 # two dirs, we should have nothing but non-contiguous directory blocks.
71 for d in $(seq 0 3); do
72 for f in `ls -1 $SCRATCH_MNT/src`; do
73 ln $SCRATCH_MNT/src/$f $SCRATCH_MNT/$d/$f
77 # Fragment the target dirs a bit. Remove a handful of entries from each to
78 # populate the best free space regions in the directory block headers. We want
79 # to populate these now so the subsequent unlinks have no reason to log the
80 # first block of the directory.
81 for d in $(seq 0 3); do
83 for f in `ls -U $SCRATCH_MNT/$d`; do
85 unlink $SCRATCH_MNT/$d/$f
91 # remount to flush and ensure subsequent operations allocate a new log item
94 # Unlink an entry towards the end of each dir and fsync. The unlink should only
95 # need to log the latter mappings of the 64k directory block. If the logging bug
96 # is present, this will crash!
97 for d in $(seq 0 3); do
98 f=`ls -U $SCRATCH_MNT/$d | tail -10 | head -n 1`
99 unlink $SCRATCH_MNT/$d/$f
100 $XFS_IO_PROG -c fsync $SCRATCH_MNT/$d
103 echo Silence is golden.