| #! /bin/bash |
| # FS QA Test 294 |
| # |
| # Test readdir on fragmented multi-fsb dir blocks |
| # |
| # If the readahead map ends with a partial multi-fsb dir |
| # block, the loop at the end of xfs_dir2_leaf_readbuf() may |
| # walk off the end of the mapping array, read garbage, |
| # corrupt the loop control counter, and never return. |
| # |
| # Failure is a hang; KASAN should also catch this. |
| # |
| #----------------------------------------------------------------------- |
| # Copyright (c) 2017 Red Hat, Inc. All Rights Reserved. |
| # Author: Eric Sandeen <sandeen@redhat.com> |
| # |
| # 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 |
| . ./common/filter |
| |
| # remove previous $seqres.full before test |
| rm -f $seqres.full |
| |
| # real QA test starts here |
| |
| # Modify as appropriate. |
| _supported_fs xfs |
| _supported_os Linux |
| _require_scratch |
| _require_test_program "punch-alternating" |
| |
| # We want to mkfs with a very specific geometry |
| MKFS_OPTIONS="" |
| _scratch_mkfs "-d size=512m -n size=8192 -i size=1024" >> $seqres.full 2>&1 \ |
| || _fail "mkfs failed" |
| _scratch_mount |
| |
| # Make a ton of mostly-empty inode clusters so we can always |
| # make more inodes |
| mkdir $SCRATCH_MNT/tmp |
| for I in `seq 1 10000`; do touch $SCRATCH_MNT/tmp/$I; done |
| |
| # These mostly-empty clusters will live here: |
| mkdir $SCRATCH_MNT/clusters |
| for I in `seq 1 32 10000`; do |
| mv $SCRATCH_MNT/tmp/$I $SCRATCH_MNT/clusters; |
| done |
| rm -rf $SCRATCH_MNT/tmp |
| |
| # Make our test dir with a couple blocks, should be contiguous |
| mkdir $SCRATCH_MNT/testdir |
| # roughly 20 chars per file |
| for I in `seq 1 100`; do |
| touch $SCRATCH_MNT/testdir/12345678901234567890$I; |
| done |
| |
| # Now completely fragment freespace. |
| # Consume most of it: |
| $XFS_IO_PROG -f -c "falloc 0 400m" $SCRATCH_MNT/fillfile || |
| _fail "Could not allocate space" |
| |
| # File to fragment: |
| $XFS_IO_PROG -f -c "falloc 0 70m" $SCRATCH_MNT/fragfile || |
| _fail "Could not allocate space" |
| |
| df -h $SCRATCH_MNT >> $seqres.full 2>&1 |
| |
| # Fill remaining space; let this run to failure |
| dd if=/dev/zero of=$SCRATCH_MNT/spacefile1 oflag=direct >> $seqres.full 2>&1 |
| # Fragment our all-consuming file |
| ./src/punch-alternating $SCRATCH_MNT/fragfile >> $seqres.full 2>&1 |
| |
| # Punching might have freed up large-ish swaths of metadata |
| # Consume hopefully any remaining contiguous freespace |
| # (and then some for good measure) |
| dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64 >> $seqres.full 2>&1 |
| |
| # Now populate the directory so that it must allocate these |
| # fragmented blocks |
| for I in `seq 1 1400`; do |
| touch $SCRATCH_MNT/testdir/12345678901234567890$I; |
| done |
| |
| # Now traverse that ugly thing! |
| find $SCRATCH_MNT/testdir | sort | _filter_scratch | md5sum |
| |
| status=0 |
| exit |