diff --git a/include/command.h b/include/command.h
index 7b9fc28..81d5a4d 100644
--- a/include/command.h
+++ b/include/command.h
@@ -20,7 +20,8 @@
 
 #include <sys/time.h>
 
-#define CMD_FLAG_GLOBAL	((int)0x80000000)	/* don't iterate "args" */
+#define CMD_FLAG_GLOBAL		(1<<31)	/* don't iterate "args" */
+#define CMD_FLAG_FOREIGN_OK	(1<<30)	/* command not restricted to XFS */
 
 typedef int (*cfunc_t)(int argc, char **argv);
 typedef void (*helpfunc_t)(void);
diff --git a/include/path.h b/include/path.h
index 46a887e..39c1a95 100644
--- a/include/path.h
+++ b/include/path.h
@@ -29,6 +29,7 @@
 
 #define FS_MOUNT_POINT	(1<<0)
 #define FS_PROJECT_PATH	(1<<1)
+#define FS_FOREIGN	(1<<2)
 
 typedef struct fs_path {
 	char		*fs_name;	/* Data device for filesystem 	*/
diff --git a/io/init.h b/io/init.h
index d773b1b..bb25242 100644
--- a/io/init.h
+++ b/io/init.h
@@ -18,7 +18,7 @@
 
 #define CMD_NOFILE_OK	(1<<0)	/* command doesn't need an open file	*/
 #define CMD_NOMAP_OK	(1<<1)	/* command doesn't need a mapped region	*/
-#define CMD_FOREIGN_OK	(1<<2)	/* command not restricted to XFS files	*/
+#define CMD_FOREIGN_OK	CMD_FLAG_FOREIGN_OK
 
 extern char	*progname;
 extern int	exitcode;
diff --git a/libxcmd/paths.c b/libxcmd/paths.c
index 71af25f..7c8c673 100644
--- a/libxcmd/paths.c
+++ b/libxcmd/paths.c
@@ -113,6 +113,9 @@ fs_table_insert(
 			goto out_nodev;
 	}
 
+	if (!platform_test_xfs_path(dir))
+		flags |= FS_FOREIGN;
+
 	/*
 	 * Make copies of the directory and data device path.
 	 * The log device and real-time device, if non-null,
@@ -301,8 +304,6 @@ fs_table_initialise_mounts(
 			return errno;
 
 	while ((mnt = getmntent(mtp)) != NULL) {
-		if (strcmp(mnt->mnt_type, "xfs") != 0)
-			continue;
 		if (!realpath(mnt->mnt_dir, rmnt_dir))
 			continue;
 		if (!realpath(mnt->mnt_fsname, rmnt_fsname))
@@ -360,8 +361,6 @@ fs_table_initialise_mounts(
 			return errno;
 
 	for (i = 0; i < count; i++) {
-		if (strcmp(stats[i].f_fstypename, "xfs") != 0)
-			continue;
 		if (!realpath(stats[i].f_mntfromname, rmntfromname))
 			continue;
 		if (!realpath(stats[i].f_mntonname, rmntonname))
diff --git a/quota/free.c b/quota/free.c
index e9e0319..b9be954 100644
--- a/quota/free.c
+++ b/quota/free.c
@@ -16,6 +16,7 @@
  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+#include <stdbool.h>
 #include "command.h"
 #include "init.h"
 #include "quota.h"
@@ -371,6 +372,7 @@ free_init(void)
 	free_cmd.args = _("[-bir] [-hn] [-f file]");
 	free_cmd.oneline = _("show free and used counts for blocks and inodes");
 	free_cmd.help = free_help;
+	free_cmd.flags = CMD_FLAG_FOREIGN_OK;
 
 	add_command(&free_cmd);
 }
diff --git a/quota/init.c b/quota/init.c
index 52f7941..c46ce0f 100644
--- a/quota/init.c
+++ b/quota/init.c
@@ -24,6 +24,7 @@
 char	*progname;
 int	exitcode;
 int	expert;
+bool	foreign_allowed = false;
 
 static char **projopts;	/* table of project names (cmdline) */
 static int nprojopts;	/* number of entries in name table. */
@@ -83,15 +84,36 @@ init_args_command(
 
 	do {
 		fs_path = &fs_table[index++];
+		if (fs_path->fs_flags & FS_PROJECT_PATH)
+			continue;
+		if (!foreign_allowed && (fs_path->fs_flags & FS_FOREIGN))
+			continue;
 	} while ((fs_path->fs_flags & FS_PROJECT_PATH) && index < fs_count);
 
 	if (fs_path->fs_flags & FS_PROJECT_PATH)
 		return 0;
+	if (!foreign_allowed && (fs_path->fs_flags & FS_FOREIGN))
+		return 0;
 	if (index > fs_count)
 		return 0;
 	return index;
 }
 
+static int
+init_check_command(
+	const cmdinfo_t	*ct)
+{
+	if (fs_path &&
+	    !(ct->flags & CMD_FLAG_FOREIGN_OK) &&
+	     (fs_path->fs_flags & FS_FOREIGN)) {
+		fprintf(stderr,
+	_("foreign mount active, %s command is for XFS filesystems only\n"),
+			ct->name);
+		return 0;
+	}
+	return 1;
+}
+
 static void
 init(
 	int		argc,
@@ -104,7 +126,7 @@ init(
 	bindtextdomain(PACKAGE, LOCALEDIR);
 	textdomain(PACKAGE);
 
-	while ((c = getopt(argc, argv, "c:d:D:P:p:t:xV")) != EOF) {
+	while ((c = getopt(argc, argv, "c:d:D:fP:p:t:xV")) != EOF) {
 		switch (c) {
 		case 'c':	/* commands */
 			add_user_command(optarg);
@@ -112,6 +134,8 @@ init(
 		case 'd':
 			add_project_opt(optarg);
 			break;
+		case 'f':
+			foreign_allowed = true;
 		case 't':
 			mtab_file = optarg;
 			break;
@@ -140,6 +164,7 @@ init(
 
 	init_commands();
 	add_args_command(init_args_command);
+	add_check_command(init_check_command);
 
 	/*
 	 * Ensure that global commands don't end up with an invalid path pointer
diff --git a/quota/init.h b/quota/init.h
index 71706cb..6879855 100644
--- a/quota/init.h
+++ b/quota/init.h
@@ -19,6 +19,7 @@
 extern char	*progname;
 extern int	exitcode;
 extern int	expert;
+extern bool	foreign_allowed;
 
 extern void	edit_init(void);
 extern void	free_init(void);
diff --git a/quota/path.c b/quota/path.c
index bdb8c98..a623d25 100644
--- a/quota/path.c
+++ b/quota/path.c
@@ -42,6 +42,7 @@ printpath(
 	if (number) {
 		printf(_("%c%03d%c "), braces? '[':' ', index, braces? ']':' ');
 	}
+	printf("%s ", (path->fs_flags & FS_FOREIGN) ? "(F)" : "   ");
 	printf(_("%-19s %s"), path->fs_dir, path->fs_name);
 	if (path->fs_flags & FS_PROJECT_PATH) {
 		prj = getprprid(path->fs_prid);
@@ -127,7 +128,7 @@ path_init(void)
 	path_cmd.cfunc = path_f;
 	path_cmd.argmin = 0;
 	path_cmd.argmax = 1;
-	path_cmd.flags = CMD_FLAG_GLOBAL;
+	path_cmd.flags = CMD_FLAG_GLOBAL | CMD_FLAG_FOREIGN_OK;
 	path_cmd.oneline = _("set current path, or show the list of paths");
 
 	print_cmd.name = "print";
@@ -135,7 +136,7 @@ path_init(void)
 	print_cmd.cfunc = print_f;
 	print_cmd.argmin = 0;
 	print_cmd.argmax = 0;
-	print_cmd.flags = CMD_FLAG_GLOBAL;
+	print_cmd.flags = CMD_FLAG_GLOBAL | CMD_FLAG_FOREIGN_OK;
 	print_cmd.oneline = _("list known mount points and projects");
 
 	if (expert)
diff --git a/quota/project.c b/quota/project.c
index fb8b9e1..e4e7a01 100644
--- a/quota/project.c
+++ b/quota/project.c
@@ -355,6 +355,7 @@ project_init(void)
 	project_cmd.argmax = -1;
 	project_cmd.oneline = _("check, setup or clear project quota trees");
 	project_cmd.help = project_help;
+	project_cmd.flags = CMD_FLAG_FOREIGN_OK;
 
 	if (expert)
 		add_command(&project_cmd);
diff --git a/quota/quot.c b/quota/quot.c
index 2e583e5..ccc154f 100644
--- a/quota/quot.c
+++ b/quota/quot.c
@@ -16,6 +16,7 @@
  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+#include <stdbool.h>
 #include "command.h"
 #include <ctype.h>
 #include <pwd.h>
diff --git a/quota/quota.c b/quota/quota.c
index e0da7c0..d09e239 100644
--- a/quota/quota.c
+++ b/quota/quota.c
@@ -16,6 +16,7 @@
  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+#include <stdbool.h>
 #include "command.h"
 #include <ctype.h>
 #include <pwd.h>
@@ -469,6 +470,7 @@ quota_init(void)
 	quota_cmd.args = _("[-bir] [-g|-p|-u] [-hnNv] [-f file] [id|name]...");
 	quota_cmd.oneline = _("show usage and limits");
 	quota_cmd.help = quota_help;
+	quota_cmd.flags = CMD_FLAG_FOREIGN_OK;
 
 	add_command(&quota_cmd);
 }
diff --git a/quota/report.c b/quota/report.c
index 70220b4..604f50d 100644
--- a/quota/report.c
+++ b/quota/report.c
@@ -15,7 +15,7 @@
  * along with this program; if not, write the Free Software Foundation,
  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
-
+#include <stdbool.h>
 #include "command.h"
 #include <sys/types.h>
 #include <pwd.h>
@@ -618,6 +618,8 @@ report_any_type(
 	if (type & XFS_USER_QUOTA) {
 		fs_cursor_initialise(dir, FS_MOUNT_POINT, &cursor);
 		while ((mount = fs_cursor_next_entry(&cursor))) {
+			if (!foreign_allowed && (mount->fs_flags & FS_FOREIGN))
+				continue;
 			if (xfsquotactl(XFS_QSYNC, mount->fs_name,
 						XFS_USER_QUOTA, 0, NULL) < 0
 					&& errno != ENOENT && errno != ENOSYS)
@@ -629,6 +631,8 @@ report_any_type(
 	if (type & XFS_GROUP_QUOTA) {
 		fs_cursor_initialise(dir, FS_MOUNT_POINT, &cursor);
 		while ((mount = fs_cursor_next_entry(&cursor))) {
+			if (!foreign_allowed && (mount->fs_flags & FS_FOREIGN))
+				continue;
 			if (xfsquotactl(XFS_QSYNC, mount->fs_name,
 						XFS_GROUP_QUOTA, 0, NULL) < 0
 					&& errno != ENOENT && errno != ENOSYS)
@@ -640,6 +644,8 @@ report_any_type(
 	if (type & XFS_PROJ_QUOTA) {
 		fs_cursor_initialise(dir, FS_MOUNT_POINT, &cursor);
 		while ((mount = fs_cursor_next_entry(&cursor))) {
+			if (!foreign_allowed && (mount->fs_flags & FS_FOREIGN))
+				continue;
 			if (xfsquotactl(XFS_QSYNC, mount->fs_name,
 						XFS_PROJ_QUOTA, 0, NULL) < 0
 					&& errno != ENOENT && errno != ENOSYS)
@@ -754,16 +760,17 @@ report_init(void)
 	dump_cmd.args = _("[-g|-p|-u] [-f file]");
 	dump_cmd.oneline = _("dump quota information for backup utilities");
 	dump_cmd.help = dump_help;
+	dump_cmd.flags = CMD_FLAG_FOREIGN_OK;
 
 	report_cmd.name = "report";
 	report_cmd.altname = "repquota";
 	report_cmd.cfunc = report_f;
 	report_cmd.argmin = 0;
 	report_cmd.argmax = -1;
-	report_cmd.flags = CMD_FLAG_GLOBAL;
 	report_cmd.args = _("[-bir] [-gpu] [-ahnt] [-f file]");
 	report_cmd.oneline = _("report filesystem quota information");
 	report_cmd.help = report_help;
+	report_cmd.flags = CMD_FLAG_GLOBAL | CMD_FLAG_FOREIGN_OK;
 
 	if (expert) {
 		add_command(&dump_cmd);
diff --git a/quota/state.c b/quota/state.c
index 8186762..d134580 100644
--- a/quota/state.c
+++ b/quota/state.c
@@ -15,7 +15,7 @@
  * along with this program; if not, write the Free Software Foundation,
  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
-
+#include <stdbool.h>
 #include "command.h"
 #include "init.h"
 #include "quota.h"
@@ -527,6 +527,7 @@ state_init(void)
 	off_cmd.args = _("[-gpu] [-v]");
 	off_cmd.oneline = _("permanently switch quota off for a path");
 	off_cmd.help = off_help;
+	off_cmd.flags = CMD_FLAG_FOREIGN_OK;
 
 	state_cmd.name = "state";
 	state_cmd.cfunc = state_f;
@@ -535,6 +536,7 @@ state_init(void)
 	state_cmd.args = _("[-gpu] [-a] [-v] [-f file]");
 	state_cmd.oneline = _("get overall quota state information");
 	state_cmd.help = state_help;
+	state_cmd.flags = CMD_FLAG_FOREIGN_OK;
 
 	enable_cmd.name = "enable";
 	enable_cmd.cfunc = enable_f;
diff --git a/quota/util.c b/quota/util.c
index e3c5398..cafd45f 100644
--- a/quota/util.c
+++ b/quota/util.c
@@ -17,6 +17,7 @@
  */
 
 #include <sys/types.h>
+#include <stdbool.h>
 #include <pwd.h>
 #include <grp.h>
 #include <utmp.h>
