| #! /bin/bash |
| # FSQA Test No. 098 |
| # |
| # Test that after truncating a file into the middle of a hole causes the new |
| # size of the file to be persisted after a clean unmount of the filesystem (or |
| # after the inode is evicted). This is for the case where all the data following |
| # the hole is not yet durably persisted, that is, that data is only present in |
| # the page cache. |
| # |
| # This test is motivated by an issue found in btrfs. |
| # |
| #----------------------------------------------------------------------- |
| # |
| # 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 generic |
| _supported_os Linux |
| _require_scratch |
| |
| # This test was motivated by an issue found in btrfs when the btrfs no-holes |
| # feature is enabled (introduced in kernel 3.14). So enable the feature if the |
| # fs being tested is btrfs. |
| if [ $FSTYP == "btrfs" ]; then |
| _require_btrfs_fs_feature "no_holes" |
| _require_btrfs_mkfs_feature "no-holes" |
| MKFS_OPTIONS="$MKFS_OPTIONS -O no-holes" |
| fi |
| |
| rm -f $seqres.full |
| |
| _scratch_mkfs >>$seqres.full 2>&1 |
| _scratch_mount |
| |
| workout() |
| { |
| local need_sync=$1 |
| |
| # Create our test file with some data and durably persist it. |
| $XFS_IO_PROG -t -f -c "pwrite -S 0xaa 0 128K" $SCRATCH_MNT/foo | _filter_xfs_io |
| sync |
| |
| # Append some data to the file, increasing its size, and leave a hole between |
| # the old size and the start offset if the following write. So our file gets |
| # a hole in the range [128Kb, 256Kb[. |
| $XFS_IO_PROG -c "pwrite -S 0xbb 256K 32K" $SCRATCH_MNT/foo | _filter_xfs_io |
| |
| # This 'sync' is to flush file extent on disk and update on-disk inode size. |
| # This is required to trigger a bug in btrfs truncate where it updates on-disk |
| # inode size incorrectly. |
| if [ $need_sync -eq 1 ]; then |
| sync |
| fi |
| |
| # Now truncate our file to a smaller size that is in the middle of the hole we |
| # previously created. |
| # If we don't flush dirty page cache above, on most truncate |
| # implementations the data we appended before gets discarded from |
| # memory (with truncate_setsize()) and never ends up being written to |
| # disk. |
| $XFS_IO_PROG -c "truncate 160K" $SCRATCH_MNT/foo |
| |
| _scratch_cycle_mount |
| |
| # We expect to see a file with a size of 160Kb, with the first 128Kb of data all |
| # having the value 0xaa and the remaining 32Kb of data all having the value 0x00 |
| echo "File content after remount:" |
| od -t x1 $SCRATCH_MNT/foo |
| } |
| |
| workout 0 |
| # flush after each write |
| workout 1 |
| |
| status=0 |
| exit |