| #! /bin/bash |
| # 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). |
| # |
| #----------------------------------------------------------------------- |
| # Copyright (c) 2016 Red Hat, Inc. All Rights Reserved. |
| # |
| # This program is free software; you can redistribute it and/or |
| # modify it under the terms of the GNU General Public License as |
| # published by the Free Software Foundation. |
| # |
| # This program is distributed in the hope that it would be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program; if not, write the Free Software Foundation, |
| # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| #----------------------------------------------------------------------- |
| # |
| |
| seq=`basename $0` |
| seqres=$RESULT_DIR/$seq |
| echo "QA output created by $seq" |
| |
| here=`pwd` |
| tmp=/tmp/$$ |
| status=1 # failure is the default! |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| _cleanup() |
| { |
| cd / |
| rm -f $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| |
| # Modify as appropriate. |
| _supported_fs xfs |
| _supported_os Linux |
| |
| _require_scratch_nocheck # check complains about single AG fs |
| _require_xfs_io_command "fpunch" |
| _require_command $UUIDGEN_PROG uuidgen |
| |
| rm -f $seqres.full |
| |
| # 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=`stat -c %s $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 |