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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2016 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test No. 306
#
# Regression test for an XFS multi-block buffer logging bug.
#
# The XFS bug results in a panic when a non-contiguous multi-block buffer is
# mapped and logged in a particular manner, such that only regions beyond the
# first fsb-sized mapping are logged. The crash occurs asynchronous to
# transaction submission, when the associated buffer log item is pushed from the
# CIL (i.e., when the log is subsequently flushed).
#
. ./common/preamble
_begin_fstest auto quick punch
# Import common functions.
# Modify as appropriate.
_supported_fs xfs
_require_scratch_nocheck # check complains about single AG fs
_require_xfs_io_command "fpunch"
_require_command $UUIDGEN_PROG uuidgen
# Disable the scratch rt device to avoid test failures relating to the rt
# bitmap consuming all the free space in our small data device.
unset SCRATCH_RTDEV
# Create a small fs with a large directory block size. We want to fill up the fs
# quickly and then create multi-fsb dirblocks over fragmented free space.
_scratch_mkfs_xfs -d size=20m -n size=64k >> $seqres.full 2>&1
_scratch_mount
# Fill a source directory with many largish-named files. 1k uuid-named entries
# sufficiently populates a 64k directory block.
mkdir $SCRATCH_MNT/src
for i in $(seq 0 1023); do
touch $SCRATCH_MNT/src/`$UUIDGEN_PROG`
done
# precreate target dirs while we still have free space for inodes
for i in $(seq 0 3); do
mkdir $SCRATCH_MNT/$i
done
# consume and fragment free space
$XFS_IO_PROG -xc "resblks 16" $SCRATCH_MNT >> $seqres.full 2>&1
dd if=/dev/zero of=$SCRATCH_MNT/file bs=4k >> $seqres.full 2>&1
$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/file >> $seqres.full 2>&1
size=`_get_filesize $SCRATCH_MNT/file`
for i in $(seq 0 8192 $size); do
$XFS_IO_PROG -c "fpunch $i 4k" $SCRATCH_MNT/file >> $seqres.full 2>&1
done
# Replicate the src dir several times into fragmented free space. After one or
# two dirs, we should have nothing but non-contiguous directory blocks.
for d in $(seq 0 3); do
for f in `ls -1 $SCRATCH_MNT/src`; do
ln $SCRATCH_MNT/src/$f $SCRATCH_MNT/$d/$f
done
done
# Fragment the target dirs a bit. Remove a handful of entries from each to
# populate the best free space regions in the directory block headers. We want
# to populate these now so the subsequent unlinks have no reason to log the
# first block of the directory.
for d in $(seq 0 3); do
i=0
for f in `ls -U $SCRATCH_MNT/$d`; do
if [ $i == 0 ]; then
unlink $SCRATCH_MNT/$d/$f
fi
i=$(((i + 1) % 128))
done
done
# remount to flush and ensure subsequent operations allocate a new log item
_scratch_cycle_mount
# Unlink an entry towards the end of each dir and fsync. The unlink should only
# need to log the latter mappings of the 64k directory block. If the logging bug
# is present, this will crash!
for d in $(seq 0 3); do
f=`ls -U $SCRATCH_MNT/$d | tail -10 | head -n 1`
unlink $SCRATCH_MNT/$d/$f
$XFS_IO_PROG -c fsync $SCRATCH_MNT/$d
done
echo Silence is golden.
# success, all done
status=0
exit
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