Allow zfs unshare <protocol> -a

Allow `zfs unshare <protocol> -a` command to share or unshare all datasets
of a given protocol, nfs or smb.

Additionally, enable most of ZFS Test Suite zfs_share/zfs_unshare test cases.
To work around some Illumos-specific functionalities ($SHARE/$UNSHARE) some
function wrappers were added around them.

Finally, fix and issue in smb_is_share_active() that would leave SMB shares
exported when invoking 'zfs unshare -a'

Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #3238 
Closes #5367

cmd/zfs/zfs_main.c

@@ -270,7 +270,7 @@ get_usage(zfs_help_t idx)
 		return (gettext("\tset <property=value> ... "
 		    "<filesystem|volume|snapshot> ...\n"));
 	case HELP_SHARE:
-		return (gettext("\tshare <-a | filesystem>\n"));
+		return (gettext("\tshare <-a [nfs|smb] | filesystem>\n"));
 	case HELP_SNAPSHOT:
 		return (gettext("\tsnapshot|snap [-r] [-o property=value] ... "
 		    "<filesystem|volume>@<snap> ...\n"));
@@ -279,7 +279,7 @@ get_usage(zfs_help_t idx)
 		    "<-a | filesystem|mountpoint>\n"));
 	case HELP_UNSHARE:
 		return (gettext("\tunshare "
-		    "<-a | filesystem|mountpoint>\n"));
+		    "<-a [nfs|smb] | filesystem|mountpoint>\n"));
 	case HELP_ALLOW:
 		return (gettext("\tallow <filesystem|volume>\n"
 		    "\tallow [-ldug] "
@@ -6436,7 +6436,7 @@ unshare_unmount(int op, int argc, char **argv)
 	char sharesmb[ZFS_MAXPROPLEN];
 
 	/* check options */
-	while ((c = getopt(argc, argv, op == OP_SHARE ? "a" : "af")) != -1) {
+	while ((c = getopt(argc, argv, op == OP_SHARE ? ":a" : "af")) != -1) {
 		switch (c) {
 		case 'a':
 			do_all = 1;
@@ -6444,6 +6444,11 @@ unshare_unmount(int op, int argc, char **argv)
 		case 'f':
 			flags = MS_FORCE;
 			break;
+		case ':':
+			(void) fprintf(stderr, gettext("missing argument for "
+			    "'%c' option\n"), optopt);
+			usage(B_FALSE);
+			break;
 		case '?':
 			(void) fprintf(stderr, gettext("invalid option '%c'\n"),
 			    optopt);
@@ -6475,6 +6480,19 @@ unshare_unmount(int op, int argc, char **argv)
 		unshare_unmount_node_t *node;
 		uu_avl_index_t idx;
 		uu_avl_walk_t *walk;
+		char *protocol = NULL;
+
+		if (op == OP_SHARE && argc > 0) {
+			if (strcmp(argv[0], "nfs") != 0 &&
+			    strcmp(argv[0], "smb") != 0) {
+				(void) fprintf(stderr, gettext("share type "
+				    "must be 'nfs' or 'smb'\n"));
+				usage(B_FALSE);
+			}
+			protocol = argv[0];
+			argc--;
+			argv++;
+		}
 
 		if (argc != 0) {
 			(void) fprintf(stderr, gettext("too many arguments\n"));
@@ -6567,8 +6585,8 @@ unshare_unmount(int op, int argc, char **argv)
 
 			switch (op) {
 			case OP_SHARE:
-				if (zfs_unshareall_bypath(node->un_zhp,
+				if (zfs_unshareall_bytype(node->un_zhp,
-				    node->un_mountp) != 0)
+				    node->un_mountp, protocol) != 0)
 					ret = 1;
 				break;
 

config/user-commands.m4

@@ -116,6 +116,7 @@ AC_DEFUN([ZFS_AC_CONFIG_USER_COMMANDS_LINUX], [
 	AC_PATH_TOOL(READLINK, readlink, "")
 	AC_PATH_TOOL(SETFACL, setfacl, "")
 	AC_PATH_TOOL(SHARE, exportfs, "")
+	AC_PATH_TOOL(NET, net, "")
 	AC_PATH_TOOL(SWAP, swapon, "")
 	AC_PATH_TOOL(SWAPADD, swapon, "")
 	AC_PATH_TOOL(UDEVADM, udevadm, "")

include/libzfs.h

@@ -763,6 +763,7 @@ extern int zfs_unshare_smb(zfs_handle_t *, const char *);
 extern int zfs_unshareall_nfs(zfs_handle_t *);
 extern int zfs_unshareall_smb(zfs_handle_t *);
 extern int zfs_unshareall_bypath(zfs_handle_t *, const char *);
+extern int zfs_unshareall_bytype(zfs_handle_t *, const char *, const char *);
 extern int zfs_unshareall(zfs_handle_t *);
 extern int zfs_deleg_share_nfs(libzfs_handle_t *, char *, char *, char *,
     void *, void *, int, zfs_share_op_t);

lib/libshare/smb.c

@@ -354,17 +354,19 @@ smb_validate_shareopts(const char *shareopts)
 static boolean_t
 smb_is_share_active(sa_share_impl_t impl_share)
 {
+	smb_share_t *iter = smb_shares;
+
 	if (!smb_available())
 		return (B_FALSE);
 
 	/* Retrieve the list of (possible) active shares */
 	smb_retrieve_shares();
 
-	while (smb_shares != NULL) {
+	while (iter != NULL) {
-		if (strcmp(impl_share->sharepath, smb_shares->path) == 0)
+		if (strcmp(impl_share->sharepath, iter->path) == 0)
 			return (B_TRUE);
 
-		smb_shares = smb_shares->next;
+		iter = iter->next;
 	}
 
 	return (B_FALSE);

lib/libzfs/libzfs_mount.c

@@ -988,6 +988,20 @@ zfs_unshareall_bypath(zfs_handle_t *zhp, const char *mountpoint)
 	return (zfs_unshare_proto(zhp, mountpoint, share_all_proto));
 }
 
+int
+zfs_unshareall_bytype(zfs_handle_t *zhp, const char *mountpoint,
+    const char *proto)
+{
+	if (proto == NULL)
+		return (zfs_unshare_proto(zhp, mountpoint, share_all_proto));
+	if (strcmp(proto, "nfs") == 0)
+		return (zfs_unshare_proto(zhp, mountpoint, nfs_only));
+	else if (strcmp(proto, "smb") == 0)
+		return (zfs_unshare_proto(zhp, mountpoint, smb_only));
+	else
+		return (1);
+}
+
 /*
  * Remove the mountpoint associated with the current dataset, if necessary.
  * We only remove the underlying directory if:

man/man8/zfs.8

@@ -160,12 +160,12 @@ zfs \- configures ZFS file systems
 
 .LP
 .nf
-\fBzfs\fR \fBshare\fR \fB-a\fR | \fIfilesystem\fR
+\fBzfs\fR \fBshare\fR [\fBnfs\fR|\fBsmb\fR] \fB-a\fR | \fIfilesystem\fR
 .fi
 
 .LP
 .nf
-\fBzfs\fR \fBunshare\fR \fB-a\fR \fIfilesystem\fR|\fImountpoint\fR
+\fBzfs\fR \fBunshare\fR [\fBnfs\fR|\fBsmb\fR] \fB-a\fR | \fIfilesystem\fR|\fImountpoint\fR
 .fi
 
 .LP
@@ -2646,7 +2646,7 @@ Unmount the specified filesystem. The command can also be given a path to a \fBZ
 .sp
 .ne 2
 .na
-\fB\fBzfs share\fR \fB-a\fR | \fIfilesystem\fR\fR
+\fB\fBzfs share\fR [\fBnfs\fR|\fBsmb\fR] \fB-a\fR | \fIfilesystem\fR\fR
 .ad
 .sp .6
 .RS 4n
@@ -2658,7 +2658,7 @@ Shares available \fBZFS\fR file systems.
 .ad
 .sp .6
 .RS 4n
-Share all available \fBZFS\fR file systems. Invoked automatically as part of the boot process.
+Share all available \fBZFS\fR file systems. Invoked automatically as part of the boot process. Additionally if one of \fBnfs\fR|\fBsmb\fR protocols is specified only share file systems whose \fBsharenfs\fR|\fBsharesmb\fR is set.
 .RE
 
 .sp
@@ -2676,11 +2676,11 @@ Share the specified filesystem according to the \fBsharenfs\fR and \fBsharesmb\f
 .sp
 .ne 2
 .na
-\fB\fBzfs unshare\fR \fB-a\fR | \fIfilesystem\fR|\fImountpoint\fR\fR
+\fB\fBzfs unshare\fR [\fBnfs\fR|\fBsmb\fR] \fB-a\fR | \fIfilesystem\fR|\fImountpoint\fR\fR
 .ad
 .sp .6
 .RS 4n
-Unshares currently shared \fBZFS\fR file systems. This is invoked automatically as part of the shutdown process.
+Unshares currently shared \fBZFS\fR file systems. This is invoked automatically as part of the shutdown process. Additionally if one of \fBnfs\fR|\fBsmb\fR is specified unshare only file systems currently shared by that protocol.
 .sp
 .ne 2
 .na

tests/runfiles/linux.run

@@ -181,11 +181,12 @@ tests = ['cache_001_pos', 'cache_002_neg', 'canmount_001_pos',
     'zfs_set_002_neg', 'zfs_set_003_neg', 'property_alias_001_pos']
 
 # DISABLED: Tests need to be updated for Linux share behavior
-#[tests/functional/cli_root/zfs_share]
+# zfs_share_005_pos - needs investigation, probably unsupported NFS share format
-#tests = ['zfs_share_001_pos', 'zfs_share_002_pos', 'zfs_share_003_pos',
+[tests/functional/cli_root/zfs_share]
-#    'zfs_share_004_pos', 'zfs_share_005_pos', 'zfs_share_006_pos',
+tests = ['zfs_share_001_pos', 'zfs_share_002_pos', 'zfs_share_003_pos',
-#    'zfs_share_007_neg', 'zfs_share_008_neg', 'zfs_share_009_neg',
+    'zfs_share_004_pos', 'zfs_share_006_pos',
-#    'zfs_share_010_neg', 'zfs_share_011_pos']
+    'zfs_share_007_neg', 'zfs_share_008_neg', 'zfs_share_009_neg',
+    'zfs_share_010_neg', 'zfs_share_011_pos']
 
 [tests/functional/cli_root/zfs_snapshot]
 tests = ['zfs_snapshot_001_neg', 'zfs_snapshot_002_neg',
@@ -203,9 +204,11 @@ tests = ['zfs_unmount_001_pos', 'zfs_unmount_002_pos', 'zfs_unmount_003_pos',
     'zfs_unmount_007_neg', 'zfs_unmount_008_neg']
 
 # DISABLED: Tests need to be updated for Linux unshare behavior
-#[tests/functional/cli_root/zfs_unshare]
+# zfs_unshare_002_pos - zfs set sharenfs=off won't unshare if it was already off
-#tests = ['zfs_unshare_001_pos', 'zfs_unshare_002_pos', 'zfs_unshare_003_pos',
+# zfs_unshare_006_pos - some distros come with Samba "user shares" disabled
-#    'zfs_unshare_004_neg', 'zfs_unshare_005_neg']
+[tests/functional/cli_root/zfs_unshare]
+tests = ['zfs_unshare_001_pos', 'zfs_unshare_003_pos',
+    'zfs_unshare_004_neg', 'zfs_unshare_005_neg']
 
 [tests/functional/cli_root/zfs_upgrade]
 tests = ['zfs_upgrade_001_pos', 'zfs_upgrade_002_pos', 'zfs_upgrade_003_pos',

tests/zfs-tests/include/commands.cfg.in

@@ -67,6 +67,7 @@ export MOUNT="@MOUNT@"
 export MPSTAT="@MPSTAT@"
 export MV="@MV@"
 export NAWK="@AWK@"
+export NET="@NET@"
 export NEWFS="@NEWFS@"
 export NPROC="@NPROC@"
 export PAGESIZE="@PAGESIZE@"

tests/zfs-tests/include/libtest.shlib

@@ -1052,7 +1052,7 @@ function datasetnonexists
 }
 
 #
-# Given a mountpoint, or a dataset name, determine if it is shared.
+# Given a mountpoint, or a dataset name, determine if it is shared via NFS.
 #
 # Returns 0 if shared, 1 otherwise.
 #
@@ -1061,11 +1061,6 @@ function is_shared
 	typeset fs=$1
 	typeset mtpt
 
-	if is_linux; then
-		log_unsupported "Currently unsupported by the test framework"
-		return 1
-	fi
-
 	if [[ $fs != "/"* ]] ; then
 		if datasetnonexists "$fs" ; then
 			return 1
@@ -1080,6 +1075,15 @@ function is_shared
 		fi
 	fi
 
+	if is_linux; then
+		for mtpt in `$SHARE | $AWK '{print $1}'` ; do
+			if [[ $mtpt == $fs ]] ; then
+				return 0
+			fi
+		done
+		return 1
+	fi
+
 	for mtpt in `$SHARE | $AWK '{print $2}'` ; do
 		if [[ $mtpt == $fs ]] ; then
 			return 0
@@ -1095,7 +1099,36 @@ function is_shared
 }
 
 #
-# Given a mountpoint, determine if it is not shared.
+# Given a dataset name determine if it is shared via SMB.
+#
+# Returns 0 if shared, 1 otherwise.
+#
+function is_shared_smb
+{
+	typeset fs=$1
+	typeset mtpt
+
+	if datasetnonexists "$fs" ; then
+		return 1
+	else
+		fs=$(echo $fs | sed 's@/@_@g')
+	fi
+
+	if is_linux; then
+		for mtpt in `$NET usershare list | $AWK '{print $1}'` ; do
+			if [[ $mtpt == $fs ]] ; then
+				return 0
+			fi
+		done
+		return 1
+	else
+		log_unsupported "Currently unsupported by the test framework"
+		return 1
+	fi
+}
+
+#
+# Given a mountpoint, determine if it is not shared via NFS.
 #
 # Returns 0 if not shared, 1 otherwise.
 #
@@ -1103,12 +1136,24 @@ function not_shared
 {
 	typeset fs=$1
 
-	if is_linux; then
+	is_shared $fs
-		log_unsupported "Currently unsupported by the test framework"
+	if (($? == 0)); then
 		return 1
 	fi
 
-	is_shared $fs
+	return 0
+}
+
+#
+# Given a dataset determine if it is not shared via SMB.
+#
+# Returns 0 if not shared, 1 otherwise.
+#
+function not_shared_smb
+{
+	typeset fs=$1
+
+	is_shared_smb $fs
 	if (($? == 0)); then
 		return 1
 	fi
@@ -1123,12 +1168,7 @@ function unshare_fs #fs
 {
 	typeset fs=$1
 
-	if is_linux; then
+	is_shared $fs || is_shared_smb $fs
-		log_unsupported "Currently unsupported by the test framework"
-		return 1
-	fi
-
-	is_shared $fs
 	if (($? == 0)); then
 		log_must $ZFS unshare $fs
 	fi
@@ -1136,6 +1176,78 @@ function unshare_fs #fs
 	return 0
 }
 
+#
+# Helper function to share a NFS mountpoint.
+#
+function share_nfs #fs
+{
+	typeset fs=$1
+
+	if is_linux; then
+		is_shared $fs
+		if (($? != 0)); then
+			log_must $SHARE "*:$fs"
+		fi
+	else
+		is_shared $fs
+		if (($? != 0)); then
+			log_must $SHARE -F nfs $fs
+		fi
+	fi
+
+	return 0
+}
+
+#
+# Helper function to unshare a NFS mountpoint.
+#
+function unshare_nfs #fs
+{
+	typeset fs=$1
+
+	if is_linux; then
+		is_shared $fs
+		if (($? == 0)); then
+			log_must $UNSHARE -u "*:$fs"
+		fi
+	else
+		is_shared $fs
+		if (($? == 0)); then
+			log_must $UNSHARE -F nfs $fs
+		fi
+	fi
+
+	return 0
+}
+
+#
+# Helper function to show NFS shares.
+#
+function showshares_nfs
+{
+	if is_linux; then
+		$SHARE -v
+	else
+		$SHARE -F nfs
+	fi
+
+	return 0
+}
+
+#
+# Helper function to show SMB shares.
+#
+function showshares_smb
+{
+	if is_linux; then
+		$NET usershare list
+	else
+		$SHARE -F smb
+	fi
+
+	return 0
+}
+
 #
 # Check NFS server status and trigger it online.
 #
@@ -1149,7 +1261,7 @@ function setup_nfs_server
 	fi
 
 	if is_linux; then
-		log_unsupported "Currently unsupported by the test framework"
+		log_note "NFS server must started prior to running test framework."
 		return
 	fi
 

tests/zfs-tests/tests/functional/cli_root/zfs_share/zfs_share_005_pos.ksh

@@ -68,7 +68,7 @@ do
 		log_fail "get sharenfs failed. ($option != ${shareopts[i]})"
 	fi
 
-	$SHARE | $GREP $option > /dev/null 2>&1
+	showshares_nfs | $GREP $option > /dev/null 2>&1
 	if (( $? != 0 )); then
 		log_fail "The '$option' option was not found in share output."
 	fi

tests/zfs-tests/tests/functional/cli_root/zfs_share/zfs_share_007_neg.ksh

@@ -59,7 +59,7 @@ do
 	log_note "Setting sharenfs=${badopts[i]} $i "
 	log_mustnot $ZFS set sharenfs="${badopts[i]}" $TESTPOOL/$TESTFS
 
-	$SHARE | $GREP $option > /dev/null 2>&1
+	showshares_nfs | $GREP $option > /dev/null 2>&1
 	if (( $? == 0 )); then
 		log_fail "An invalid setting '$option' was propagated."
 	fi

tests/zfs-tests/tests/functional/cli_root/zfs_share/zfs_share_009_neg.ksh

@@ -59,7 +59,7 @@ if [[ $sharenfs_val == off ]]; then
 	log_must $ZFS set sharenfs=on $fs
 fi
 
-$SHARE | $GREP $mpt >/dev/null 2>&1
+showshares_nfs | $GREP $mpt >/dev/null 2>&1
 if (( $? != 0 )); then
 	log_must $ZFS share $fs
 fi

tests/zfs-tests/tests/functional/cli_root/zfs_unshare/Makefile.am

@@ -6,4 +6,5 @@ dist_pkgdata_SCRIPTS = \
 	zfs_unshare_002_pos.ksh \
 	zfs_unshare_003_pos.ksh \
 	zfs_unshare_004_neg.ksh \
-	zfs_unshare_005_neg.ksh
+	zfs_unshare_005_neg.ksh \
+	zfs_unshare_006_pos.ksh

tests/zfs-tests/tests/functional/cli_root/zfs_unshare/zfs_unshare_001_pos.ksh

@@ -88,7 +88,7 @@ function test_unshare # <mntp> <filesystem>
 
 	if [[ $prop_value == "off" ]]; then
 		not_shared $mntp ||
-			log_must $UNSHARE -F nfs $mntp
+			log_must eval "unshare_nfs $mntp"
 		log_must $ZFS set sharenfs=on $filesystem
 		is_shared $mntp || \
 			log_fail "'$ZFS set sharenfs=on' fails to make" \

tests/zfs-tests/tests/functional/cli_root/zfs_unshare/zfs_unshare_002_pos.ksh

@@ -45,7 +45,7 @@ function cleanup
 	typeset -i i=0
 	while (( i < ${#mntp_fs[*]} )); do
 		is_shared ${mntp_fs[i]} && \
-			log_must $UNSHARE -F nfs ${mntp_fs[i]}
+			log_must eval "unshare_nfs ${mntp_fs[i]}"
 
 		((i = i + 2))
 	done
@@ -86,7 +86,7 @@ function test_legacy_unshare # <mntp> <filesystem>
 	    log_fail "'zfs set sharenfs=off' fails to make ZFS " \
 	    "filesystem $filesystem unshared."
 
-	log_must $SHARE -F nfs $mntp
+	log_must eval "share_nfs $mntp"
 	is_shared $mntp || \
 	    log_fail "'share' command fails to share ZFS file system."
 	#
@@ -150,7 +150,7 @@ done
 #
 i=0
 while (( i < ${#mntp_fs[*]} )); do
-        $SHARE -F nfs ${mntp_fs[i]}
+        share_nfs ${mntp_fs[i]}
         is_shared ${mntp_fs[i]} || \
                 log_fail "'$SHARE' shares ZFS filesystem failed."
 

tests/zfs-tests/tests/functional/cli_root/zfs_unshare/zfs_unshare_003_pos.ksh

@@ -68,7 +68,7 @@ function test_snap_unshare # <mntp> <filesystem>
 	prop_value=$(get_prop "sharenfs" $filesystem)
 
 	if [[ $prop_value == "off" ]]; then
-		is_shared $mntp || $UNSHARE -F nfs $mntp
+		is_shared $mntp || unshare_nfs $mntp
 		log_must $ZFS set sharenfs=on $filesystem
 	fi
 

tests/zfs-tests/tests/functional/cli_root/zfs_unshare/zfs_unshare_006_pos.ksh

@@ -0,0 +1,88 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright 2016, loli10K. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# Verify that 'zfs unshare [nfs|smb] -a' unshares only filesystems shared by the
+# specified protocol.
+#
+# STRATEGY:
+# 1. Share filesystems with different protocols.
+# 2. Invoke 'zfs unshare nfs -a' to unshare filesystems.
+# 3. Verify that only nfs filesystems are unshared.
+# 4. Share all filesystems again.
+# 5. Invoke 'zfs unshare smb -a' and verify only smb filesystems are unshared.
+#
+
+verify_runnable "global"
+
+function cleanup
+{
+	log_must $ZFS unshare -a
+	log_must $ZFS destroy -f $TESTPOOL/$TESTFS/shared1
+	log_must $ZFS destroy -f $TESTPOOL/$TESTFS/shared2
+	log_must $ZFS destroy -f $TESTPOOL/$TESTFS/shared3
+}
+
+log_assert "Verify '$ZFS unshare [nfs|smb] -a' only works on the specified "\
+	"protocol."
+log_onexit cleanup
+
+# 1. Share filesystems with different protocols.
+log_must $ZFS create $TESTPOOL/$TESTFS/shared1
+log_must $ZFS create $TESTPOOL/$TESTFS/shared2
+log_must $ZFS create $TESTPOOL/$TESTFS/shared3
+log_must $ZFS set mountpoint=$TESTDIR/1 $TESTPOOL/$TESTFS/shared1
+log_must $ZFS set mountpoint=$TESTDIR/2 $TESTPOOL/$TESTFS/shared2
+log_must $ZFS set mountpoint=$TESTDIR/3 $TESTPOOL/$TESTFS/shared3
+log_must $ZFS set sharenfs=on $TESTPOOL/$TESTFS/shared1
+log_must $ZFS set sharenfs=on $TESTPOOL/$TESTFS/shared2
+log_must $ZFS set sharesmb=on $TESTPOOL/$TESTFS/shared2
+log_must $ZFS set sharesmb=on $TESTPOOL/$TESTFS/shared3
+log_must $ZFS share -a
+
+# 2. Invoke 'zfs unshare nfs -a' to unshare filesystems.
+log_must $ZFS unshare nfs -a
+
+# 3. Verify that only nfs filesystems are unshared.
+log_must eval "not_shared $TESTPOOL/$TESTFS/shared1"
+log_must eval "not_shared $TESTPOOL/$TESTFS/shared2"
+log_must eval "is_shared_smb $TESTPOOL/$TESTFS/shared2"
+log_must eval "is_shared_smb $TESTPOOL/$TESTFS/shared3"
+
+# 4. Share all filesystems again.
+log_must $ZFS share -a
+
+# 5. Invoke 'zfs unshare smb -a' and verify only smb filesystems are unshared.
+log_must $ZFS unshare smb -a
+log_must eval "is_shared $TESTPOOL/$TESTFS/shared1"
+log_must eval "is_shared $TESTPOOL/$TESTFS/shared2"
+log_must eval "not_shared_smb $TESTPOOL/$TESTFS/shared2"
+log_must eval "not_shared_smb $TESTPOOL/$TESTFS/shared3"
+
+log_pass "'$ZFS unshare [nfs|smb] -a' only works on the specified protocol."