| #! /bin/bash |
| # FSQA Test No. 103 |
| # |
| # Regression test for file read corruption when using compressed extents that |
| # are shared by multiple consecutive ranges of the same file. |
| # |
| #----------------------------------------------------------------------- |
| # |
| # Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved. |
| # Author: Filipe Manana <fdmanana@suse.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" |
| tmp=/tmp/$$ |
| status=1 # failure is the default! |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| _cleanup() |
| { |
| rm -f $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| |
| # real QA test starts here |
| _supported_fs btrfs |
| _supported_os Linux |
| _require_scratch |
| _require_cloner |
| |
| rm -f $seqres.full |
| |
| test_clone_and_read_compressed_extent() |
| { |
| local mount_opts=$1 |
| |
| _scratch_mkfs >>$seqres.full 2>&1 |
| _scratch_mount $mount_opts |
| |
| BLOCK_SIZE=$(_get_block_size $SCRATCH_MNT) |
| |
| # Create a test file with a single extent that is compressed (the |
| # data we write into it is highly compressible no matter which |
| # compression algorithm is used, zlib or lzo). |
| $XFS_IO_PROG -f -c "pwrite -S 0xaa 0K $((1 * $BLOCK_SIZE))" \ |
| -c "pwrite -S 0xbb $((1 * $BLOCK_SIZE)) $((2 * $BLOCK_SIZE))" \ |
| -c "pwrite -S 0xcc $((3 * $BLOCK_SIZE)) $((1 * $BLOCK_SIZE))" \ |
| $SCRATCH_MNT/foo | _filter_xfs_io_blocks_modified |
| |
| |
| # Now clone our extent into an adjacent offset. |
| $CLONER_PROG -s $((1 * $BLOCK_SIZE)) -d $((4 * $BLOCK_SIZE)) \ |
| -l $((2 * $BLOCK_SIZE)) $SCRATCH_MNT/foo $SCRATCH_MNT/foo |
| |
| # Same as before but for this file we clone the extent into a lower |
| # file offset. |
| $XFS_IO_PROG -f \ |
| -c "pwrite -S 0xaa $((2 * $BLOCK_SIZE)) $((1 * $BLOCK_SIZE))" \ |
| -c "pwrite -S 0xbb $((3 * $BLOCK_SIZE)) $((2 * $BLOCK_SIZE))" \ |
| -c "pwrite -S 0xcc $((5 * $BLOCK_SIZE)) $((1 * $BLOCK_SIZE))" \ |
| $SCRATCH_MNT/bar | _filter_xfs_io_blocks_modified |
| |
| $CLONER_PROG -s $((3 * $BLOCK_SIZE)) -d 0 -l $((2 * $BLOCK_SIZE)) \ |
| $SCRATCH_MNT/bar $SCRATCH_MNT/bar |
| |
| echo "File contents before unmounting filesystem:" |
| echo "foo:" |
| od -t x1 $SCRATCH_MNT/foo | _filter_od |
| echo "bar:" |
| od -t x1 $SCRATCH_MNT/bar | _filter_od |
| |
| # Evicting the inode or clearing the page cache before reading again |
| # the file would also trigger the bug - reads were returning all bytes |
| # in the range corresponding to the second reference to the extent with |
| # a value of 0, but the correct data was persisted (it was a bug |
| # exclusively in the read path). The issue happened only if the same |
| # readpages() call targeted pages belonging to the first and second |
| # ranges that point to the same compressed extent. |
| _scratch_cycle_mount |
| |
| echo "File contents after mounting filesystem again:" |
| # Must match the same contents we got before. |
| echo "foo:" |
| od -t x1 $SCRATCH_MNT/foo | _filter_od |
| echo "bar:" |
| od -t x1 $SCRATCH_MNT/bar | _filter_od |
| } |
| |
| echo -e "\nTesting with zlib compression..." |
| test_clone_and_read_compressed_extent "-o compress=zlib" |
| |
| _scratch_unmount |
| |
| echo -e "\nTesting with lzo compression..." |
| test_clone_and_read_compressed_extent "-o compress=lzo" |
| |
| status=0 |
| exit |