| #! /bin/bash |
| # FS QA Test 036 |
| # |
| # Test mount error cases with exclusive directories |
| # |
| # Overlayfs is often used to mount several mounts that share a single |
| # lower dir, but every overlayfs mount should have its own private |
| # upperdir and private workdir. |
| # |
| # Overlayfs mount on kernel <= v4.12 does not check if upper/work dirs |
| # are currently in-use by another overlayfs mount on the system and bad |
| # things can happen with such configuration. |
| # |
| # Commit 2cac0c00a6cd ("ovl: get exclusive ownership on upper/work dirs") |
| # in kernel v4.13 enforces upper/work dir in-use for any overlayfs mount. |
| # Later stable fix commit 85fdee1eef1a ("ovl: fix regression caused by |
| # exclusive upper/work dir protection") relaxes mount failure to a warning |
| # for index=off mount and fails mount with EBUSY for index=on mount. |
| # |
| # This test expects success with index=off and EBUSY with index=on |
| # when trying to mount overlay with: |
| # - Upper dir is in-use by another overlay mount |
| # - Work dir is in-use by another overlay mount |
| # |
| #----------------------------------------------------------------------- |
| # Copyright (C) 2017 CTERA Networks. All Rights Reserved. |
| # Author: Amir Goldstein <amir73il@gmail.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.* |
| # unmount the two extra mounts in case they did not fail |
| $UMOUNT_PROG $SCRATCH_MNT 2>/dev/null |
| $UMOUNT_PROG $SCRATCH_MNT 2>/dev/null |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| |
| # remove previous $seqres.full before test |
| rm -f $seqres.full |
| |
| # real QA test starts here |
| _supported_fs overlay |
| _supported_os Linux |
| # Use non-default scratch underlying overlay dirs, we need to check |
| # them explicity after test. |
| _require_scratch_nocheck |
| _require_scratch_feature index |
| |
| # Remove all files from previous tests |
| _scratch_mkfs |
| |
| # Create multiple lowerdirs, upperdirs and workdirs |
| lowerdir=$OVL_BASE_SCRATCH_MNT/lower |
| lowerdir2=$OVL_BASE_SCRATCH_MNT/lower2 |
| upperdir=$OVL_BASE_SCRATCH_MNT/upper |
| upperdir2=$OVL_BASE_SCRATCH_MNT/upper2 |
| workdir=$OVL_BASE_SCRATCH_MNT/workdir |
| workdir2=$OVL_BASE_SCRATCH_MNT/workdir2 |
| mkdir -p $lowerdir $lowerdir2 $upperdir $upperdir2 $workdir $workdir2 |
| |
| # Mount overlay with lowerdir, upperdir, workdir |
| _overlay_mount_dirs $lowerdir $upperdir $workdir \ |
| overlay $SCRATCH_MNT |
| |
| # Try to mount another overlay with the same upperdir |
| # with index=off - expect success |
| _overlay_mount_dirs $lowerdir $upperdir $workdir2 \ |
| overlay0 $SCRATCH_MNT -oindex=off && \ |
| $UMOUNT_PROG $SCRATCH_MNT |
| |
| # Try to mount another overlay with the same workdir |
| # with index=off - expect success |
| _overlay_mount_dirs $lowerdir2 $upperdir2 $workdir \ |
| overlay1 $SCRATCH_MNT -oindex=off && \ |
| $UMOUNT_PROG $SCRATCH_MNT |
| |
| # Try to mount another overlay with the same upperdir |
| # with index=on - expect EBUSY |
| _overlay_mount_dirs $lowerdir $upperdir $workdir2 \ |
| overlay2 $SCRATCH_MNT -oindex=on 2>&1 | _filter_busy_mount |
| |
| # Try to mount another overlay with the same workdir |
| # with index=on - expect EBUSY |
| _overlay_mount_dirs $lowerdir2 $upperdir2 $workdir \ |
| overlay3 $SCRATCH_MNT -oindex=on 2>&1 | _filter_busy_mount |
| |
| # check overlayfs |
| _overlay_check_scratch_dirs $lowerdir $upperdir $workdir |
| |
| # success, all done |
| status=0 |
| exit |