| #! /bin/bash |
| # FSQA Test No. 102 |
| # |
| # Regression test for an ENOSPC issue when attempting to write to a file in |
| # a filesystem without any data block groups allocated. |
| # |
| #----------------------------------------------------------------------- |
| # |
| # 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 |
| |
| rm -f $seqres.full |
| |
| _scratch_mkfs >>$seqres.full 2>&1 |
| |
| # Mount our filesystem without space caches enabled so that we do not get any |
| # space used from the initial data block group that mkfs creates (space caches |
| # used space from data block groups). |
| _scratch_mount "-o nospace_cache" |
| |
| # Need an fs with at least 2Gb to make sure mkfs.btrfs does not create an fs |
| # using mixed block groups (used both for data and metadata). We really need |
| # to have dedicated block groups for data to reproduce the issue and mkfs.btrfs |
| # defaults to mixed block groups only for small filesystems (up to 1Gb). |
| _require_fs_space $SCRATCH_MNT $((2 * 1024 * 1024)) |
| |
| # Run balance with the purpose of deleting the unused data block group that |
| # mkfs created. We could also wait for the background kthread to automatically |
| # delete the unused block group, but we do not have a way to make it run and |
| # wait for it to complete, so just do a balance instead of some unreliable sleep |
| _run_btrfs_util_prog balance start -dusage=0 $SCRATCH_MNT |
| |
| # Now unmount the filesystem, mount it again (either with or with space caches |
| # enabled, it does not matter to trigger the problem) and attempt to create a |
| # file with some data - this used to fail with ENOSPC because there were no |
| # data block groups when the filesystem was mounted and the data space info |
| # object was marked as full when initialized (because it had 0 total bytes), |
| # which prevented the file write path from attempting to allocate a data block |
| # group and fail immediately with ENOSPC. |
| _scratch_cycle_mount |
| echo "hello world" > $SCRATCH_MNT/foobar |
| |
| echo "Silence is golden" |
| status=0 |
| exit |