Fix remounting snapshots read-write
It's not enough to preserve/restore MS_RDONLY on the superblock flags to avoid remounting a snapshot read-write: be explicit about our intentions to the VFS layer so the readonly bit is updated correctly in do_remount_sb(). Reviewed-by: Chunwei Chen <tuxoko@gmail.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: loli10K <ezomori.nozomu@gmail.com> Closes #6510 Closes #6515
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LOLi
Brian Behlendorf
parent
a1f3a1c05f
commit
08de8c16f5
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@ -1763,8 +1763,15 @@ zfs_remount(struct super_block *sb, int *flags, zfs_mnt_t *zm)
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{
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zfsvfs_t *zfsvfs = sb->s_fs_info;
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vfs_t *vfsp;
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boolean_t issnap = dmu_objset_is_snapshot(zfsvfs->z_os);
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int error;
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if ((issnap || !spa_writeable(dmu_objset_spa(zfsvfs->z_os))) &&
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!(*flags & MS_RDONLY)) {
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*flags |= MS_RDONLY;
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return (EROFS);
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}
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error = zfsvfs_parse_options(zm->mnt_data, &vfsp);
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if (error)
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return (error);
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@ -1774,7 +1781,8 @@ zfs_remount(struct super_block *sb, int *flags, zfs_mnt_t *zm)
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vfsp->vfs_data = zfsvfs;
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zfsvfs->z_vfs = vfsp;
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(void) zfs_register_callbacks(vfsp);
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if (!issnap)
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(void) zfs_register_callbacks(vfsp);
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return (error);
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}
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@ -119,7 +119,7 @@ tests = ['zfs_mount_001_pos', 'zfs_mount_002_pos', 'zfs_mount_003_pos',
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'zfs_mount_004_pos', 'zfs_mount_005_pos', 'zfs_mount_007_pos',
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'zfs_mount_008_pos', 'zfs_mount_009_neg', 'zfs_mount_010_neg',
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'zfs_mount_011_neg', 'zfs_mount_012_neg', 'zfs_mount_all_001_pos',
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'zfs_mount_encrypted']
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'zfs_mount_encrypted', 'zfs_mount_remount']
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[tests/functional/cli_root/zfs_promote]
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tests = ['zfs_promote_001_pos', 'zfs_promote_002_pos', 'zfs_promote_003_pos',
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@ -17,4 +17,5 @@ dist_pkgdata_SCRIPTS = \
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zfs_mount_011_neg.ksh \
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zfs_mount_012_neg.ksh \
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zfs_mount_encrypted.ksh \
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zfs_mount_all_001_pos.ksh
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zfs_mount_all_001_pos.ksh \
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zfs_mount_remount.ksh
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@ -0,0 +1,144 @@
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#!/bin/ksh -p
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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 http://www.opensolaris.org/os/licensing.
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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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#
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# Copyright 2017, loli10K <ezomori.nozomu@gmail.com>. All rights reserved.
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#
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. $STF_SUITE/include/libtest.shlib
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. $STF_SUITE/tests/functional/cli_root/zfs_mount/zfs_mount.kshlib
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#
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# DESCRIPTION:
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# Verify remount functionality, expecially on readonly objects.
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#
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# STRATEGY:
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# 1. Prepare a filesystem and a snapshot
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# 2. Verify we can (re)mount the dataset readonly/read-write
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# 3. Verify we can mount the snapshot and it's mounted readonly
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# 4. Verify we can't remount it read-write
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# 5. Re-import the pool readonly
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# 6. Verify we can't remount its filesystem read-write
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#
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verify_runnable "both"
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function cleanup
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{
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log_must zpool export $TESTPOOL
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log_must zpool import $TESTPOOL
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snapexists $TESTSNAP && log_must zfs destroy $TESTSNAP
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[[ -d $MNTPSNAP ]] && log_must rmdir $MNTPSNAP
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return 0
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}
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#
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# Verify the $filesystem is mounted readonly
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# This is preferred over "log_mustnot touch $fs" because we actually want to
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# verify the error returned is EROFS
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#
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function readonlyfs # filesystem
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{
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typeset filesystem="$1"
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file_write -o create -f $filesystem/file.dat
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ret=$?
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if [[ $ret != 30 ]]; then
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log_fail "Writing to $filesystem did not return EROFS ($ret)."
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fi
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}
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#
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# Verify $dataset is mounted with $option
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#
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function checkmount # dataset option
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{
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typeset dataset="$1"
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typeset option="$2"
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options="$(awk -v ds="$dataset" '$1 == ds { print $4 }' /proc/mounts)"
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if [[ "$options" == '' ]]; then
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log_fail "Dataset $dataset is not mounted"
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elif [[ ! -z "${options##*$option*}" ]]; then
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log_fail "Dataset $dataset is not mounted with expected "\
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"option $option ($options)"
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else
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log_note "Dataset $dataset is mounted with option $option"
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fi
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}
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log_assert "Verify remount functionality on both filesystem and snapshots"
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log_onexit cleanup
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# 1. Prepare a filesystem and a snapshot
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TESTFS=$TESTPOOL/$TESTFS
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TESTSNAP="$TESTFS@snap"
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datasetexists $TESTFS || log_must zfs create $TESTFS
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snapexists $TESTSNAP || log_must zfs snapshot $TESTSNAP
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log_must zfs set readonly=off $TESTFS
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MNTPFS="$(get_prop mountpoint $TESTFS)"
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MNTPSNAP="$TESTDIR/zfs_snap_mount"
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log_must mkdir -p $MNTPSNAP
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# 2. Verify we can (re)mount the dataset readonly/read-write
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log_must touch $MNTPFS/file.dat
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checkmount $TESTFS 'rw'
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log_must mount -o remount,ro $TESTFS $MNTPFS
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readonlyfs $MNTPFS
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checkmount $TESTFS 'ro'
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log_must mount -o remount,rw $TESTFS $MNTPFS
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log_must touch $MNTPFS/file.dat
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checkmount $TESTFS 'rw'
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# 3. Verify we can (re)mount the snapshot readonly
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log_must mount -t zfs $TESTSNAP $MNTPSNAP
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readonlyfs $MNTPSNAP
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checkmount $TESTSNAP 'ro'
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log_must mount -o remount,ro $TESTSNAP $MNTPSNAP
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readonlyfs $MNTPSNAP
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checkmount $TESTSNAP 'ro'
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log_must umount $MNTPSNAP
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# 4. Verify we can't remount a snapshot read-write
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# The "mount -o rw" command will succeed but the snapshot is mounted readonly.
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# The "mount -o remount,rw" command must fail with an explicit error.
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log_must mount -t zfs -o rw $TESTSNAP $MNTPSNAP
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readonlyfs $MNTPSNAP
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checkmount $TESTSNAP 'ro'
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log_mustnot mount -o remount,rw $TESTSNAP $MNTPSNAP
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readonlyfs $MNTPSNAP
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checkmount $TESTSNAP 'ro'
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log_must umount $MNTPSNAP
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# 5. Re-import the pool readonly
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log_must zpool export $TESTPOOL
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log_must zpool import -o readonly=on $TESTPOOL
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# 6. Verify we can't remount its filesystem read-write
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readonlyfs $MNTPFS
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checkmount $TESTFS 'ro'
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log_mustnot mount -o remount,rw $MNTPFS
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readonlyfs $MNTPFS
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checkmount $TESTFS 'ro'
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log_pass "Both filesystem and snapshots can be remounted correctly."
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