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tonyhuttertonyhutter
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ZTS: add mount_loopback to test zfs behind loop dev
Add a test case to reproduce issue openzfs#17277: 1. Make a pool 2. Write a file to the pool 3. Mount the file as a loopback device 4. Make an XFS filesystem on the loopback device 5. Mount the XFS filesystem... <hangs> Signed-off-by: Tony Hutter <[email protected]>
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‎.github/workflows/scripts/qemu-6-tests.sh

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# run functional testings and save exitcode
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cd /var/tmp
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TAGS=$2/$3
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TAGS=mount
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if [ "$4" == "quick" ]; then
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export RUNFILES="sanity.run"
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fi

‎tests/runfiles/linux.run

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@@ -165,7 +165,7 @@ tests = ['mmp_on_thread', 'mmp_on_uberblocks', 'mmp_on_off', 'mmp_interval',
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tags = ['functional', 'mmp']
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[tests/functional/mount:Linux]
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tests = ['umount_unlinked_drain']
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tests = ['umount_unlinked_drain', 'mount_loopback']
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tags = ['functional', 'mount']
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[tests/functional/pam:Linux]

‎tests/zfs-tests/include/commands.cfg

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@@ -146,6 +146,7 @@ export SYSTEM_FILES_LINUX='attr
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lscpu
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lsmod
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lsscsi
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mkfs.xfs
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mkswap
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modprobe
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mountpoint

‎tests/zfs-tests/tests/Makefile.am

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@@ -1673,6 +1673,7 @@ nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
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functional/mmp/setup.ksh \
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functional/mount/cleanup.ksh \
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functional/mount/setup.ksh \
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functional/mount/mount_loopback.ksh \
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functional/mount/umount_001.ksh \
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functional/mount/umountall_001.ksh \
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functional/mount/umount_unlinked_drain.ksh \

‎tests/zfs-tests/tests/functional/mount/mount_loopback.ksh

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#!/bin/ksh -p
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# SPDX-License-Identifier: CDDL-1.0
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#
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# CDDL HEADER START
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#
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# The contents of this file are subject to the terms of the
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# Common Development and Distribution License (the "License").
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# You may not use this file except in compliance with the License.
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#
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# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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# or https://opensource.org/licenses/CDDL-1.0.
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# See the License for the specific language governing permissions
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# and limitations under the License.
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#
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# When distributing Covered Code, include this CDDL HEADER in each
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# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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# If applicable, add the following below this CDDL HEADER, with the
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# fields enclosed by brackets "[]" replaced with your own identifying
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# information: Portions Copyright [yyyy] [name of copyright owner]
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#
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# CDDL HEADER END
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#
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# Copyright (c) 2025 by Lawrence Livermore National Security, LLC.
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. $STF_SUITE/include/libtest.shlib
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#
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# DESCRIPTION:
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# Verify that we can make an xfs filesystem on a ZFS-backed loopback device.
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#
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# See:
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# https://github.com/openzfs/zfs/pull/17298
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# https://github.com/openzfs/zfs/issues/17277
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#
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# STRATEGY:
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# 1. Make a pool
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# 2. Make a file on the pool or create zvol
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# 3. Mount the file/zvol behind a loopback device
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# 4. Create & mount an xfs filesystem on the loopback device
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function cleanup
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{
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if [ -d $TEST_BASE_DIR/mnt ] ; then
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umount $TEST_BASE_DIR/mnt
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log_must rmdir $TEST_BASE_DIR/mnt
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fi
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if [ -n "$DEV" ] ; then
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log_must losetup -d $DEV
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fi
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destroy_pool $TESTPOOL2
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log_must rm -f $TEST_BASE_DIR/file1
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}
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log_assert "Make an xfs filesystem on a ZFS-backed loopback device"
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log_onexit cleanup
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TESTPOOL2=testpool2
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# fio options
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export NUMJOBS=2
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export RUNTIME=3
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export PERF_RANDSEED=1234
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export PERF_COMPPERCENT=66
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export PERF_COMPCHUNK=0
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export BLOCKSIZE=128K
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export SYNC_TYPE=0
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export FILE_SIZE=$(( 1024 * 1024 ))
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function do_test
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{
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imgfile=$1
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log_note "Running test on $imgfile"
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log_must losetup -f $imgfile
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DEV=$(losetup --associated $imgfile | grep -Eo '^/dev/loop[0-9]+')
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log_note "DEV: $DEV"
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log_must mkfs.xfs $DEV
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mkdir $TEST_BASE_DIR/mnt
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log_must mount $DEV $TEST_BASE_DIR/mnt
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export DIRECTORY=$TEST_BASE_DIR/mnt
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for d in 0 1 ; do
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# fio options
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export DIRECT=$d
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log_must fio $FIO_SCRIPTS/mkfiles.fio
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log_must fio $FIO_SCRIPTS/random_reads.fio
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done
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log_must umount $TEST_BASE_DIR/mnt
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log_must rmdir $TEST_BASE_DIR/mnt
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log_must losetup -d $DEV
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DEV=""
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}
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truncate -s 1G $TEST_BASE_DIR/file1
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log_must zpool create $TESTPOOL2 $TEST_BASE_DIR/file1
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log_must truncate -s 512M /$TESTPOOL2/img
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do_test /$TESTPOOL2/img
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log_must rm /$TESTPOOL2/img
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log_must zfs create -V 512M $TESTPOOL2/vol
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block_device_wait "$ZVOL_DEVDIR/$TESTPOOL2/vol"
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if [ ! -e "$ZVOL_DEVDIR/$TESTPOOL2/vol" ] ; then
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blkdev=/dev/zd0
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else
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blkdev=${ZVOL_DEVDIR}/$TESTPOOL2/vol
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fi
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do_test $blkdev
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log_pass "Verified xfs filesystem on a ZFS-backed loopback device"

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