Add the '-a' option to 'zpool export'

Support exporting all imported pools in one go, using 'zpool export -a'.

This is accomplished by moving the export parts from zpool_do_export()
in to the new function zpool_export_one().  The for_each_pool() function
is used to enumerate the list of pools to be exported.  Passing an argc
of 0 implies the function should be called on all pools.

Signed-off-by: Turbo Fredriksson <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes: #3203

cmd/zpool/zpool_main.c

@@ -222,7 +222,7 @@ get_usage(zpool_help_t idx) {
 	case HELP_DETACH:
 		return (gettext("\tdetach <pool> <device>\n"));
 	case HELP_EXPORT:
-		return (gettext("\texport [-f] <pool> ...\n"));
+		return (gettext("\texport [-af] <pool> ...\n"));
 	case HELP_HISTORY:
 		return (gettext("\thistory [-il] [<pool>] ...\n"));
 	case HELP_IMPORT:
@@ -1212,9 +1212,39 @@ zpool_do_destroy(int argc, char **argv)
 	return (ret);
 }
 
+typedef struct export_cbdata {
+	boolean_t force;
+	boolean_t hardforce;
+} export_cbdata_t;
+
+/*
+ * Export one pool
+ */
+int
+zpool_export_one(zpool_handle_t *zhp, void *data)
+{
+	export_cbdata_t *cb = data;
+
+	if (zpool_disable_datasets(zhp, cb->force) != 0)
+		return (1);
+
+	/* The history must be logged as part of the export */
+	log_history = B_FALSE;
+
+	if (cb->hardforce) {
+		if (zpool_export_force(zhp, history_str) != 0)
+			return (1);
+	} else if (zpool_export(zhp, cb->force, history_str) != 0) {
+		return (1);
+	}
+
+	return (0);
+}
+
 /*
  * zpool export [-f] <pool> ...
  *
+ *	-a	Export all pools
  *	-f	Forcefully unmount datasets
  *
  * Export the given pools.  By default, the command will attempt to cleanly
@@ -1224,16 +1254,18 @@ zpool_do_destroy(int argc, char **argv)
 int
 zpool_do_export(int argc, char **argv)
 {
+	export_cbdata_t cb;
+	boolean_t do_all = B_FALSE;
 	boolean_t force = B_FALSE;
 	boolean_t hardforce = B_FALSE;
-	int c;
-	zpool_handle_t *zhp;
-	int ret;
-	int i;
+	int c, ret;
 
 	/* check options */
-	while ((c = getopt(argc, argv, "fF")) != -1) {
+	while ((c = getopt(argc, argv, "afF")) != -1) {
 		switch (c) {
+		case 'a':
+			do_all = B_TRUE;
+			break;
 		case 'f':
 			force = B_TRUE;
 			break;
@@ -1247,40 +1279,28 @@ zpool_do_export(int argc, char **argv)
 		}
 	}
 
+	cb.force = force;
+	cb.hardforce = hardforce;
 	argc -= optind;
 	argv += optind;
 
+	if (do_all) {
+		if (argc != 0) {
+			(void) fprintf(stderr, gettext("too many arguments\n"));
+			usage(B_FALSE);
+		}
+
+		return (for_each_pool(argc, argv, B_TRUE, NULL,
+		    zpool_export_one, &cb));
+	}
+
 	/* check arguments */
 	if (argc < 1) {
 		(void) fprintf(stderr, gettext("missing pool argument\n"));
 		usage(B_FALSE);
 	}
 
-	ret = 0;
-	for (i = 0; i < argc; i++) {
-		if ((zhp = zpool_open_canfail(g_zfs, argv[i])) == NULL) {
-			ret = 1;
-			continue;
-		}
-
-		if (zpool_disable_datasets(zhp, force) != 0) {
-			ret = 1;
-			zpool_close(zhp);
-			continue;
-		}
-
-		/* The history must be logged as part of the export */
-		log_history = B_FALSE;
-
-		if (hardforce) {
-			if (zpool_export_force(zhp, history_str) != 0)
-				ret = 1;
-		} else if (zpool_export(zhp, force, history_str) != 0) {
-			ret = 1;
-		}
-
-		zpool_close(zhp);
-	}
+	ret = for_each_pool(argc, argv, B_TRUE, NULL, zpool_export_one, &cb);
 
 	return (ret);
 }

man/man8/zpool.8

@@ -57,7 +57,7 @@ zpool \- configures ZFS storage pools
 
 .LP
 .nf
-\fBzpool export\fR [\fB-f\fR] \fIpool\fR ...
+\fBzpool export\fR [\fB-a\fR] [\fB-f\fR] \fIpool\fR ...
 .fi
 
 .LP
@@ -1059,11 +1059,13 @@ Forces any active datasets contained within the pool to be unmounted.
 Detaches \fIdevice\fR from a mirror. The operation is refused if there are no other valid replicas of the data.  If \fIdevice\fR may be re-added to the pool later on then consider the "\fBzpool offline\fR" command instead.
 .RE
 
+.RE
+
 .sp
 .ne 2
 .mk
 .na
-\fB\fBzpool export\fR [\fB-f\fR] \fIpool\fR ...\fR
+\fB\fBzpool export\fR [\fB-a\fR] [\fB-f\fR] \fIpool\fR ...\fR
 .ad
 .sp .6
 .RS 4n
@@ -1072,14 +1074,25 @@ Exports the given pools from the system. All devices are marked as exported, but
 Before exporting the pool, all datasets within the pool are unmounted. A pool can not be exported if it has a shared spare that is currently being used.
 .sp
 For pools to be portable, you must give the \fBzpool\fR command whole disks, not just partitions, so that \fBZFS\fR can label the disks with portable \fBEFI\fR labels. Otherwise, disk drivers on platforms of different endianness will not recognize the disks.
+.sp
+.ne 2
+.mk
+.na
+\fB\fB-a\fR\fR
+.ad
+.RS 6n
+.rt
+Exports all pools imported on the system.
+.RE
+
 .sp
 .ne 2
 .mk
 .na
 \fB\fB-f\fR\fR
 .ad
 .RS 6n
-.rt  
+.rt
 Forcefully unmount all datasets, using the "\fBunmount -f\fR" command.
 .sp
 This command will forcefully export the pool even if it has a shared spare that is currently being used. This may lead to potential data corruption.