'zfs share -a' should clean noauto exports
This is a follow on to PR #10688 where `zfs share -a` allows the sharing of canmount=noauto datasets if they are mounted. However, when a dataset with canmount=noauto is not mounted, the command should also purge any existing entries from the exports file. Otherwise, after a reboot, the nfs server attempts to export the underlying mountpath, not the dataset. This can lead to a hard hang for existing client mounts. Instead of just skipping the adding of an export if not mounted and canmount=noauto, have it also remove an existing export of the dataset so that, after a reboot, we don't export an unmounted dataset. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Wilson <gwilson@delphix.com> Signed-off-by: Don Brady <don.brady@delphix.com> Closes #10747
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@ -6634,8 +6634,11 @@ share_mount_one(zfs_handle_t *zhp, int op, int flags, char *protocol,
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*/
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if (op == OP_MOUNT)
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return (0);
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if (op == OP_SHARE && !zfs_is_mounted(zhp, NULL))
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if (op == OP_SHARE && !zfs_is_mounted(zhp, NULL)) {
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/* also purge it from existing exports */
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zfs_unshareall_bypath(zhp, mountpoint);
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return (0);
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}
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}
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/*
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@ -52,7 +52,8 @@ tests = ['zfs_mount_006_pos', 'zfs_mount_008_pos', 'zfs_multi_mount']
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tags = ['functional', 'cli_root', 'zfs_mount']
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[tests/functional/cli_root/zfs_share:Linux]
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tests = ['zfs_share_005_pos', 'zfs_share_007_neg', 'zfs_share_009_neg']
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tests = ['zfs_share_005_pos', 'zfs_share_007_neg', 'zfs_share_009_neg',
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'zfs_share_012_pos']
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tags = ['functional', 'cli_root', 'zfs_share']
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[tests/functional/cli_root/zfs_sysfs:Linux]
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@ -13,6 +13,7 @@ dist_pkgdata_SCRIPTS = \
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zfs_share_009_neg.ksh \
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zfs_share_010_neg.ksh \
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zfs_share_011_pos.ksh \
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zfs_share_012_pos.ksh \
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zfs_share_concurrent_shares.ksh
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dist_pkgdata_DATA = \
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85
tests/zfs-tests/tests/functional/cli_root/zfs_share/zfs_share_012_pos.ksh
Executable file
85
tests/zfs-tests/tests/functional/cli_root/zfs_share/zfs_share_012_pos.ksh
Executable file
@ -0,0 +1,85 @@
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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 2009 Sun Microsystems, Inc. All rights reserved.
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# Use is subject to license terms.
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#
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#
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# Copyright (c) 2020 by Delphix. All rights reserved.
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#
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. $STF_SUITE/include/libtest.shlib
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#
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# DESCRIPTION: Unmounted canmount=noauto export is removed during zfs share -a
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#
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# STRATEGY:
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# 1. Share a dataset that also has canmount set to noauto
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# 2. Capture the zfs exports file when the dataset is mounted + shared
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# 3. Simulate a reboot by unmounting the dataset and restoring the exports file
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# 4. Verify that 'zfs share -a' removes the export since dataset is not mounted
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#
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verify_runnable "both"
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dataset="$TESTPOOL/$TESTFS"
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mountpt=$(get_prop mountpoint $dataset)
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function cleanup
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{
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zfs set canmount=on $dataset
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zfs set sharenfs=off $dataset
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zfs mount -a
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#
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# unset __ZFS_POOL_EXCLUDE so that we include all file systems when
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# rebuilding the exports file
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#
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unset __ZFS_POOL_EXCLUDE
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rm /etc/exports.d/zfs.exports
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zfs share -a
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}
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log_assert "Unmounted canmount=noauto export is removed during zfs share -a"
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log_onexit cleanup
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log_must zfs set canmount=noauto $dataset
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zfs mount $dataset > /dev/null 2>&1
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log_must mounted $dataset
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log_must zfs set sharenfs=on $dataset
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log_must is_exported $mountpt
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log_must cp /etc/exports.d/zfs.exports /etc/exports.d/zfs.exports.save
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log_must zfs umount $dataset
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log_must unmounted $dataset
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log_mustnot is_exported $mountpt
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# simulate a reboot condition
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log_must mv /etc/exports.d/zfs.exports.save /etc/exports.d/zfs.exports
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log_must is_exported $mountpt
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log_must zfs share -a
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log_mustnot is_exported $mountpt
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log_pass "Unmounted canmount=noauto export is removed during zfs share -a"
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