Linux compat 2.6.39: mount_nodev()

The .get_sb callback has been replaced by a .mount callback
in the file_system_type structure.  When using the new
interface the caller must now use the mount_nodev() helper.

Unfortunately, the new interface no longer passes the vfsmount
down to the zfs layers.  This poses a problem for the existing
implementation because we currently save this pointer in the
super block for latter use.  It provides our only entry point
in to the namespace layer for manipulating certain mount options.

This needed to be done originally to allow commands like
'zfs set atime=off tank' to work properly.  It also allowed me
to keep more of the original Solaris code unmodified.  Under
Solaris there is a 1-to-1 mapping between a mount point and a
file system so this is a fairly natural thing to do.  However,
under Linux they many be multiple entries in the namespace
which reference the same filesystem.  Thus keeping a back
reference from the filesystem to the namespace is complicated.

Rather than introduce some ugly hack to get the vfsmount and
continue as before.  I'm leveraging this API change to update
the ZFS code to do things in a more natural way for Linux.
This has the upside that is resolves the compatibility issue
for the long term and fixes several other minor bugs which
have been reported.

This commit updates the code to remove this vfsmount back
reference entirely.  All modifications to filesystem mount
options are now passed in to the kernel via a '-o remount'.
This is the expected Linux mechanism and allows the namespace
to properly handle any options which apply to it before passing
them on to the file system itself.

Aside from fixing the compatibility issue, removing the
vfsmount has had the benefit of simplifying the code.  This
change which fairly involved has turned out nicely.

Closes #246
Closes #217
Closes #187
Closes #248
Closes #231

Makefile.in

@@ -76,6 +76,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/Makefile.in

@@ -61,6 +61,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/mount_zfs/Makefile.in

@@ -64,6 +64,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/mount_zfs/mount_zfs.c

@@ -96,6 +96,7 @@ static const option_map_t option_map[] = {
 	{ MNTOPT_QUIET,		MS_SILENT,	ZS_COMMENT	},
 #endif
 	/* Custom zfs options */
+	{ MNTOPT_XATTR,		MS_COMMENT,	ZS_COMMENT	},
 	{ MNTOPT_NOXATTR,	MS_COMMENT,	ZS_COMMENT	},
 	{ MNTOPT_ZFSUTIL,	MS_COMMENT,	ZS_ZFSUTIL	},
 	{ NULL,			0,		0		} };

cmd/sas_switch_id/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/zdb/Makefile.in

@@ -64,6 +64,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/zfs/Makefile.in

@@ -64,6 +64,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/zinject/Makefile.in

@@ -64,6 +64,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/zpios/Makefile.in

@@ -64,6 +64,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/zpool/Makefile.in

@@ -64,6 +64,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/zpool_id/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/zpool_layout/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/ztest/Makefile.in

@@ -64,6 +64,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

cmd/zvol_id/Makefile.in

@@ -64,6 +64,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

config/kernel-mount-nodev.m4

@@ -0,0 +1,15 @@
+dnl #
+dnl # 2.6.39 API change
+dnl # The .get_sb callback has been replaced by a .mount callback
+dnl # in the file_system_type structure.  When using the new
+dnl # interface the caller must now use the mount_nodev() helper.
+dnl # This updated callback and helper no longer pass the vfsmount.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_MOUNT_NODEV], [
+	ZFS_CHECK_SYMBOL_EXPORT(
+		[mount_nodev],
+		[fs/super.c],
+		[AC_DEFINE(HAVE_MOUNT_NODEV, 1,
+		[mount_nodev() is available])],
+		[])
+])

config/kernel.m4

@@ -39,6 +39,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
 	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
 	ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
+	ZFS_AC_KERNEL_MOUNT_NODEV
 
 	if test "$LINUX_OBJ" != "$LINUX"; then
 		KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"

configure

@@ -14635,6 +14635,46 @@ fi
 	EXTRA_KCFLAGS="$tmp_flags"
 
 
+	{ $as_echo "$as_me:$LINENO: checking whether symbol mount_nodev is exported" >&5
+$as_echo_n "checking whether symbol mount_nodev is exported... " >&6; }
+	grep -q -E '[[:space:]]mount_nodev[[:space:]]' \
+		$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
+	rc=$?
+	if test $rc -ne 0; then
+		export=0
+		for file in fs/super.c; do
+			grep -q -E "EXPORT_SYMBOL.*(mount_nodev)" "$LINUX/$file" 2>/dev/null
+			rc=$?
+		        if test $rc -eq 0; then
+		                export=1
+		                break;
+		        fi
+		done
+		if test $export -eq 0; then
+			{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+		else
+			{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_MOUNT_NODEV 1
+_ACEOF
+
+		fi
+	else
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_MOUNT_NODEV 1
+_ACEOF
+
+	fi
+
+
+
 	if test "$LINUX_OBJ" != "$LINUX"; then
 		KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
 	fi
@@ -18869,6 +18909,46 @@ fi
 	EXTRA_KCFLAGS="$tmp_flags"
 
 
+	{ $as_echo "$as_me:$LINENO: checking whether symbol mount_nodev is exported" >&5
+$as_echo_n "checking whether symbol mount_nodev is exported... " >&6; }
+	grep -q -E '[[:space:]]mount_nodev[[:space:]]' \
+		$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
+	rc=$?
+	if test $rc -ne 0; then
+		export=0
+		for file in fs/super.c; do
+			grep -q -E "EXPORT_SYMBOL.*(mount_nodev)" "$LINUX/$file" 2>/dev/null
+			rc=$?
+		        if test $rc -eq 0; then
+		                export=1
+		                break;
+		        fi
+		done
+		if test $export -eq 0; then
+			{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+		else
+			{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_MOUNT_NODEV 1
+_ACEOF
+
+		fi
+	else
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_MOUNT_NODEV 1
+_ACEOF
+
+	fi
+
+
+
 	if test "$LINUX_OBJ" != "$LINUX"; then
 		KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
 	fi

dracut/90zfs/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

dracut/Makefile.in

@@ -61,6 +61,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

etc/Makefile.in

@@ -61,6 +61,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

etc/init.d/Makefile.in

@@ -61,6 +61,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

etc/udev/Makefile.in

@@ -61,6 +61,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

etc/udev/rules.d/Makefile.in

@@ -62,6 +62,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

etc/zfs/Makefile.in

@@ -62,6 +62,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

include/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

include/libzfs.h

@@ -436,6 +436,7 @@ extern int zfs_prop_get_userquota_int(zfs_handle_t *zhp, const char *propname,
     uint64_t *propvalue);
 extern int zfs_prop_get_userquota(zfs_handle_t *zhp, const char *propname,
     char *propbuf, int proplen, boolean_t literal);
+extern uint64_t getprop_uint64(zfs_handle_t *, zfs_prop_t, char **);
 extern uint64_t zfs_prop_get_int(zfs_handle_t *, zfs_prop_t);
 extern int zfs_prop_inherit(zfs_handle_t *, const char *, boolean_t);
 extern const char *zfs_prop_values(zfs_prop_t);

include/linux/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

include/sys/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

include/sys/fm/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

include/sys/fm/fs/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

include/sys/fs/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

include/sys/zfs_vfsops.h

@@ -42,7 +42,6 @@ struct zfs_sb;
 struct znode;
 
 typedef struct zfs_sb {
-	struct vfsmount	*z_vfs;		/* generic vfs struct */
 	struct super_block *z_sb;	/* generic super_block */
 	struct zfs_sb	*z_parent;	/* parent fs */
 	objset_t	*z_os;		/* objset reference */
@@ -89,7 +88,7 @@ typedef struct zfs_sb {
 
 #define	ZFS_SUPER_MAGIC	0x2fc12fc1
 
-#define	ZSB_XATTR_USER	0x0001		/* Enable user xattrs */
+#define	ZSB_XATTR	0x0001		/* Enable user xattrs */
 
 
 /*
@@ -182,6 +181,7 @@ extern int zfs_set_version(zfs_sb_t *zsb, uint64_t newvers);
 extern int zfs_sb_create(const char *name, zfs_sb_t **zsbp);
 extern void zfs_sb_free(zfs_sb_t *zsb);
 extern int zfs_check_global_label(const char *dsname, const char *hexsl);
+extern boolean_t zfs_is_readonly(zfs_sb_t *zsb);
 
 extern int zfs_register_callbacks(zfs_sb_t *zsb);
 extern void zfs_unregister_callbacks(zfs_sb_t *zsb);
@@ -190,7 +190,7 @@ extern int zfs_umount(struct super_block *sb);
 extern int zfs_remount(struct super_block *sb, int *flags, char *data);
 extern int zfs_root(zfs_sb_t *zsb, struct inode **ipp);
 extern int zfs_statvfs(struct dentry *dentry, struct kstatfs *statp);
-extern int zfs_vget(struct vfsmount *vfsp, struct inode **ipp, fid_t *fidp);
+extern int zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp);
 
 #ifdef	__cplusplus
 }

include/sys/zfs_znode.h

@@ -236,9 +236,8 @@ typedef struct znode {
  */
 #define	ZTOI(znode)	(&((znode)->z_inode))
 #define	ITOZ(inode)	(container_of((inode), znode_t, z_inode))
-#define VTOZSB(vfs)	((zfs_sb_t *)((vfs)->mnt_sb->s_fs_info))
+#define	ZTOZSB(znode)	((zfs_sb_t *)(ZTOI(znode)->i_sb->s_fs_info))
-#define ZTOZSB(znode)	((zfs_sb_t *)(ZTOI(znode)->i_sb->s_fs_info))
+#define	ITOZSB(inode)	((zfs_sb_t *)((inode)->i_sb->s_fs_info))
-#define ITOZSB(inode)	((zfs_sb_t *)((inode)->i_sb->s_fs_info))
 
 #define	S_ISDEV(mode)	(S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode))
 
@@ -306,7 +305,7 @@ typedef struct znode {
 #define	CONTENT_MODIFIED	(ATTR_MTIME | ATTR_CTIME)
 
 #define	ZFS_ACCESSTIME_STAMP(zsb, zp) \
-	if ((zsb)->z_atime && !((zsb)->z_vfs->mnt_flags & MNT_READONLY)) \
+	if ((zsb)->z_atime && !(zfs_is_readonly(zsb))) \
 		zfs_tstamp_update_setup(zp, ACCESSED, NULL, NULL, B_FALSE);
 
 extern int	zfs_init_fs(zfs_sb_t *, znode_t **);

include/sys/zpl.h

@@ -51,7 +51,6 @@ extern const struct file_operations zpl_dir_file_operations;
 typedef struct zpl_mount_data {
 	const char *z_osname;	/* Dataset name */
 	void *z_data;		/* Mount options string */
-	struct vfsmount *z_vfs;	/* VFS mount point */
 } zpl_mount_data_t;
 
 extern const struct super_operations zpl_super_operations;

lib/Makefile.in

@@ -61,6 +61,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libavl/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libefi/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libnvpair/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/asm-generic/Makefile.in

@@ -62,6 +62,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/asm-i386/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/asm-x86_64/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/include/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/include/ia32/Makefile.in

@@ -61,6 +61,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/include/ia32/sys/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/include/rpc/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/include/sys/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/include/sys/dktp/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/include/sys/mntent.h

@@ -88,8 +88,8 @@
 #define	MNTOPT_LOUD	"loud"		/* verbose mount */
 #define	MNTOPT_BIND	"bind"		/* remount part of a tree */
 #define	MNTOPT_RBIND	"rbind"		/* include subtrees */
-#define	MNTOPT_XATTR	"user_xattr"	/* enable extended attributes */
+#define	MNTOPT_XATTR	"xattr"		/* enable extended attributes */
-#define	MNTOPT_NOXATTR	"nouser_xattr"	/* disable extended attributes */
+#define	MNTOPT_NOXATTR	"noxattr"	/* disable extended attributes */
 #define	MNTOPT_COMMENT	"comment"	/* comment */
 #define	MNTOPT_ZFSUTIL	"zfsutil"	/* called by zfs utility */
 

lib/libspl/include/sys/sysevent/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libspl/include/util/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libunicode/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libuutil/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libzfs/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

lib/libzfs/libzfs_dataset.c

@@ -1313,6 +1313,25 @@ zfs_setprop_error(libzfs_handle_t *hdl, zfs_prop_t prop, int err,
 	}
 }
 
+static boolean_t
+zfs_is_namespace_prop(zfs_prop_t prop)
+{
+	switch (prop) {
+
+	case ZFS_PROP_ATIME:
+	case ZFS_PROP_DEVICES:
+	case ZFS_PROP_EXEC:
+	case ZFS_PROP_SETUID:
+	case ZFS_PROP_READONLY:
+	case ZFS_PROP_XATTR:
+	case ZFS_PROP_NBMAND:
+		return (B_TRUE);
+
+	default:
+		return (B_FALSE);
+	}
+}
+
 /*
  * Given a property name and value, set the property for the given dataset.
  */
@@ -1408,12 +1427,22 @@ zfs_prop_set(zfs_handle_t *zhp, const char *propname, const char *propval)
 		if (do_prefix)
 			ret = changelist_postfix(cl);
 
-		/*
+		if (ret == 0) {
-		 * Refresh the statistics so the new property value
+			/*
-		 * is reflected.
+			 * Refresh the statistics so the new property
-		 */
+			 * value is reflected.
-		if (ret == 0)
+			 */
 			(void) get_stats(zhp);
+
+			/*
+			 * Remount the filesystem to propagate the change
+			 * if one of the options handled by the generic
+			 * Linux namespace layer has been modified.
+			 */
+			if (zfs_is_namespace_prop(prop) &&
+			    zfs_is_mounted(zhp, NULL))
+				ret = zfs_mount(zhp, MNTOPT_REMOUNT, 0);
+		}
 	}
 
 error:
@@ -1530,7 +1559,7 @@ error:
  * True DSL properties are stored in an nvlist.  The following two functions
  * extract them appropriately.
  */
-static uint64_t
+uint64_t
 getprop_uint64(zfs_handle_t *zhp, zfs_prop_t prop, char **source)
 {
 	nvlist_t *nv;

lib/libzfs/libzfs_mount.c

@@ -315,6 +315,52 @@ do_unmount(const char *mntpt, int flags)
 	return (rc ? EINVAL : 0);
 }
 
+static int
+zfs_add_option(zfs_handle_t *zhp, char *options, int len,
+    zfs_prop_t prop, char *on, char *off)
+{
+	char *source;
+	uint64_t value;
+
+	/* Skip adding duplicate default options */
+	if ((strstr(options, on) != NULL) || (strstr(options, off) != NULL))
+		return (0);
+
+	/*
+	 * zfs_prop_get_int() to not used to ensure our mount options
+	 * are not influenced by the current /etc/mtab contents.
+	 */
+	value = getprop_uint64(zhp, prop, &source);
+
+	(void) strlcat(options, ",", len);
+	(void) strlcat(options, value ? on : off, len);
+
+	return (0);
+}
+
+static int
+zfs_add_options(zfs_handle_t *zhp, char *options, int len)
+{
+	int error = 0;
+
+	error = zfs_add_option(zhp, options, len,
+	    ZFS_PROP_ATIME, MNTOPT_ATIME, MNTOPT_NOATIME);
+	error = error ? error : zfs_add_option(zhp, options, len,
+	    ZFS_PROP_DEVICES, MNTOPT_DEVICES, MNTOPT_NODEVICES);
+	error = error ? error : zfs_add_option(zhp, options, len,
+	    ZFS_PROP_EXEC, MNTOPT_EXEC, MNTOPT_NOEXEC);
+	error = error ? error : zfs_add_option(zhp, options, len,
+	    ZFS_PROP_READONLY, MNTOPT_RO, MNTOPT_RW);
+	error = error ? error : zfs_add_option(zhp, options, len,
+	    ZFS_PROP_SETUID, MNTOPT_SETUID, MNTOPT_NOSETUID);
+	error = error ? error : zfs_add_option(zhp, options, len,
+	    ZFS_PROP_XATTR, MNTOPT_XATTR, MNTOPT_NOXATTR);
+	error = error ? error : zfs_add_option(zhp, options, len,
+	    ZFS_PROP_NBMAND, MNTOPT_NBMAND, MNTOPT_NONBMAND);
+
+	return (error);
+}
+
 /*
  * Mount the given filesystem.
  */
@@ -325,12 +371,16 @@ zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
 	char mountpoint[ZFS_MAXPROPLEN];
 	char mntopts[MNT_LINE_MAX];
 	libzfs_handle_t *hdl = zhp->zfs_hdl;
-	int rc;
+	int remount = 0, rc;
 
-	if (options == NULL)
+	if (options == NULL) {
 		(void) strlcpy(mntopts, MNTOPT_DEFAULTS, sizeof (mntopts));
-	else
+	} else {
 		(void) strlcpy(mntopts, options, sizeof (mntopts));
+	}
+
+	if (strstr(mntopts, MNTOPT_REMOUNT) != NULL)
+		remount = 1;
 
 	/*
 	 * If the pool is imported read-only then all mounts must be read-only
@@ -338,6 +388,22 @@ zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
 	if (zpool_get_prop_int(zhp->zpool_hdl, ZPOOL_PROP_READONLY, NULL))
 		(void) strlcat(mntopts, "," MNTOPT_RO, sizeof (mntopts));
 
+	/*
+	 * Append default mount options which apply to the mount point.
+	 * This is done because under Linux (unlike Solaris) multiple mount
+	 * points may reference a single super block.  This means that just
+	 * given a super block there is no back reference to update the per
+	 * mount point options.
+	 */
+	rc = zfs_add_options(zhp, mntopts, sizeof (mntopts));
+	if (rc) {
+		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+		    "default options unavailable"));
+		return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
+		    dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
+		    mountpoint));
+	}
+
 	/*
 	 * Append zfsutil option so the mount helper allow the mount
 	 */
@@ -361,8 +427,7 @@ zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
 	 * Determine if the mountpoint is empty.  If so, refuse to perform the
 	 * mount.  We don't perform this check if 'remount' is specified.
 	 */
-	if (strstr(mntopts, MNTOPT_REMOUNT) == NULL &&
+	if (!remount && !dir_is_empty(mountpoint)) {
-	    !dir_is_empty(mountpoint)) {
 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 		    "directory is not empty"));
 		return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
@@ -403,6 +468,10 @@ zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
 		    zhp->zfs_name));
 	}
 
+	/* remove the mounted entry before re-adding on remount */
+	if (remount)
+		libzfs_mnttab_remove(hdl, zhp->zfs_name);
+
 	/* add the mounted entry into our cache */
 	libzfs_mnttab_add(hdl, zfs_get_name(zhp), mountpoint, mntopts);
 	return (0);

lib/libzpool/Makefile.in

@@ -63,6 +63,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

man/Makefile.in

@@ -61,6 +61,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

man/man8/Makefile.in

@@ -61,6 +61,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

module/zfs/zfs_acl.c

@@ -2136,8 +2136,7 @@ top:
 static int
 zfs_zaccess_dataset_check(znode_t *zp, uint32_t v4_mode)
 {
-	if ((v4_mode & WRITE_MASK) &&
+	if ((v4_mode & WRITE_MASK) && (zfs_is_readonly(ZTOZSB(zp))) &&
-	    (ZTOZSB(zp)->z_vfs->mnt_flags & MNT_READONLY) &&
 	    (!S_ISDEV(ZTOI(zp)->i_mode) ||
 	    (S_ISDEV(ZTOI(zp)->i_mode) && (v4_mode & WRITE_MASK_ATTRS)))) {
 		return (EROFS);

module/zfs/zfs_dir.c

@@ -1045,7 +1045,7 @@ top:
 		return (ENOENT);
 	}
 
-	if (zsb->z_vfs->mnt_flags & MNT_READONLY) {
+	if (zfs_is_readonly(zsb)) {
 		zfs_dirent_unlock(dl);
 		return (EROFS);
 	}

module/zfs/zfs_ioctl.c

@@ -1107,8 +1107,9 @@ get_zfs_sb(const char *dsname, zfs_sb_t **zsbp)
 
 	mutex_enter(&os->os_user_ptr_lock);
 	*zsbp = dmu_objset_get_user(os);
-	if (*zsbp) {
+	if (*zsbp && (*zsbp)->z_sb) {
-		mntget((*zsbp)->z_vfs);
+		if (atomic_inc_not_zero(&((*zsbp)->z_sb->s_active)))
+			error = ESRCH;
 	} else {
 		error = ESRCH;
 	}
@@ -1119,7 +1120,7 @@ get_zfs_sb(const char *dsname, zfs_sb_t **zsbp)
 
 /*
  * Find a zfs_sb_t for a mounted filesystem, or create our own, in which
- * case its z_vfs will be NULL, and it will be opened as the owner.
+ * case its z_sb will be NULL, and it will be opened as the owner.
  */
 static int
 zfs_sb_hold(const char *name, void *tag, zfs_sb_t **zsbp, boolean_t writer)
@@ -1149,8 +1150,8 @@ zfs_sb_rele(zfs_sb_t *zsb, void *tag)
 {
 	rrw_exit(&zsb->z_teardown_lock, tag);
 
-	if (zsb->z_vfs) {
+	if (zsb->z_sb) {
-		mntput(zsb->z_vfs);
+		deactivate_super(zsb->z_sb);
 	} else {
 		dmu_objset_disown(zsb->z_os, zsb);
 		zfs_sb_free(zsb);
@@ -3239,7 +3240,7 @@ zfs_ioc_rollback(zfs_cmd_t *zc)
 			resume_err = zfs_resume_fs(zsb, zc->zc_name);
 			error = error ? error : resume_err;
 		}
-		mntput(zsb->z_vfs);
+		deactivate_super(zsb->z_sb);
 	} else {
 		if (dsl_dataset_tryown(ds, B_FALSE, FTAG)) {
 			error = dsl_dataset_clone_swap(clone, ds, B_TRUE);
@@ -3724,7 +3725,7 @@ zfs_ioc_recv(zfs_cmd_t *zc)
 			if (error == 0)
 				error = zfs_resume_fs(zsb, tofs);
 			error = error ? error : end_err;
-			mntput(zsb->z_vfs);
+			deactivate_super(zsb->z_sb);
 		} else {
 			error = dmu_recv_end(&drc);
 		}
@@ -4137,7 +4138,7 @@ zfs_ioc_userspace_upgrade(zfs_cmd_t *zc)
 		}
 		if (error == 0)
 			error = dmu_objset_userspace_upgrade(zsb->z_os);
-		mntput(zsb->z_vfs);
+		deactivate_super(zsb->z_sb);
 	} else {
 		/* XXX kind of reading contents without owning */
 		error = dmu_objset_hold(zc->zc_name, FTAG, &os);

module/zfs/zfs_vfsops.c

@@ -122,22 +122,17 @@ zfs_sync(struct super_block *sb, int wait, cred_t *cr)
 }
 EXPORT_SYMBOL(zfs_sync);
 
+boolean_t
+zfs_is_readonly(zfs_sb_t *zsb)
+{
+	return (!!(zsb->z_sb->s_flags & MS_RDONLY));
+}
+EXPORT_SYMBOL(zfs_is_readonly);
+
 static void
 atime_changed_cb(void *arg, uint64_t newval)
 {
-	zfs_sb_t *zsb = arg;
+	((zfs_sb_t *)arg)->z_atime = newval;
-	struct super_block *sb = zsb->z_sb;
-	struct vfsmount *vfs = zsb->z_vfs;
-
-	if (newval == TRUE) {
-		vfs->mnt_flags &= ~MNT_NOATIME;
-		sb->s_flags &= ~MS_NOATIME;
-		zsb->z_atime = TRUE;
-	} else {
-		vfs->mnt_flags |= MNT_NOATIME;
-		sb->s_flags |= MS_NOATIME;
-		zsb->z_atime = FALSE;
-	}
 }
 
 static void
@@ -145,11 +140,10 @@ xattr_changed_cb(void *arg, uint64_t newval)
 {
 	zfs_sb_t *zsb = arg;
 
-	if (newval == TRUE) {
+	if (newval == TRUE)
-		zsb->z_flags |= ZSB_XATTR_USER;
+		zsb->z_flags |= ZSB_XATTR;
-	} else {
+	else
-		zsb->z_flags &= ~ZSB_XATTR_USER;
+		zsb->z_flags &= ~ZSB_XATTR;
-	}
 }
 
 static void
@@ -169,84 +163,44 @@ readonly_changed_cb(void *arg, uint64_t newval)
 {
 	zfs_sb_t *zsb = arg;
 	struct super_block *sb = zsb->z_sb;
-	struct vfsmount *vfs = zsb->z_vfs;
 
-	if (newval) {
+	if (sb == NULL)
-		vfs->mnt_flags |= MNT_READONLY;
+		return;
+
+	if (newval)
 		sb->s_flags |= MS_RDONLY;
-	} else {
+	else
-		vfs->mnt_flags &= ~MNT_READONLY;
 		sb->s_flags &= ~MS_RDONLY;
-	}
 }
 
 static void
 devices_changed_cb(void *arg, uint64_t newval)
 {
-	zfs_sb_t *zsb = arg;
-	struct super_block *sb = zsb->z_sb;
-	struct vfsmount *vfs = zsb->z_vfs;
-
-	if (newval == FALSE) {
-		vfs->mnt_flags |= MNT_NODEV;
-		sb->s_flags |= MS_NODEV;
-	} else {
-		vfs->mnt_flags &= ~MNT_NODEV;
-		sb->s_flags &= ~MS_NODEV;
-	}
 }
 
 static void
 setuid_changed_cb(void *arg, uint64_t newval)
 {
-	zfs_sb_t *zsb = arg;
-	struct super_block *sb = zsb->z_sb;
-	struct vfsmount *vfs = zsb->z_vfs;
-
-	if (newval == FALSE) {
-		vfs->mnt_flags |= MNT_NOSUID;
-		sb->s_flags |= MS_NOSUID;
-	} else {
-		vfs->mnt_flags &= ~MNT_NOSUID;
-		sb->s_flags &= ~MS_NOSUID;
-	}
 }
 
 static void
 exec_changed_cb(void *arg, uint64_t newval)
 {
-	zfs_sb_t *zsb = arg;
-	struct super_block *sb = zsb->z_sb;
-	struct vfsmount *vfs = zsb->z_vfs;
-
-	if (newval == FALSE) {
-		vfs->mnt_flags |= MNT_NOEXEC;
-		sb->s_flags |= MS_NOEXEC;
-	} else {
-		vfs->mnt_flags &= ~MNT_NOEXEC;
-		sb->s_flags &= ~MS_NOEXEC;
-	}
 }
 
-/*
- * The nbmand mount option can be changed at mount time.
- * We can't allow it to be toggled on live file systems or incorrect
- * behavior may be seen from cifs clients
- *
- * This property isn't registered via dsl_prop_register(), but this callback
- * will be called when a file system is first mounted
- */
 static void
 nbmand_changed_cb(void *arg, uint64_t newval)
 {
 	zfs_sb_t *zsb = arg;
 	struct super_block *sb = zsb->z_sb;
 
-	if (newval == TRUE) {
+	if (sb == NULL)
+		return;
+
+	if (newval == TRUE)
 		sb->s_flags |= MS_MANDLOCK;
-	} else {
+	else
 		sb->s_flags &= ~MS_MANDLOCK;
-	}
 }
 
 static void
@@ -270,58 +224,12 @@ acl_inherit_changed_cb(void *arg, uint64_t newval)
 int
 zfs_register_callbacks(zfs_sb_t *zsb)
 {
-	struct vfsmount *vfsp = zsb->z_vfs;
 	struct dsl_dataset *ds = NULL;
 	objset_t *os = zsb->z_os;
-	uint64_t nbmand;
-	boolean_t readonly = B_FALSE;
-	boolean_t setuid = B_TRUE;
-	boolean_t exec = B_TRUE;
-	boolean_t devices = B_TRUE;
-	boolean_t xattr = B_TRUE;
-	boolean_t atime = B_TRUE;
-	char osname[MAXNAMELEN];
 	int error = 0;
 
-	/*
+	if (zfs_is_readonly(zsb) || !spa_writeable(dmu_objset_spa(os)))
-	 * While Linux allows multiple vfs mounts per super block we have
+		readonly_changed_cb(zsb, B_TRUE);
-	 * limited it artificially to one in zfs_fill_super.  Thus it is
-	 * safe for us to modify the vfs mount fails through the callbacks.
-	 */
-	if ((vfsp->mnt_flags & MNT_READONLY) ||
-	    !spa_writeable(dmu_objset_spa(os)))
-		readonly = B_TRUE;
-
-	if (vfsp->mnt_flags & MNT_NOSUID) {
-		devices = B_FALSE;
-		setuid = B_FALSE;
-	} else {
-		if (vfsp->mnt_flags & MNT_NODEV)
-			devices = B_FALSE;
-	}
-
-	if (vfsp->mnt_flags & MNT_NOEXEC)
-		exec = B_FALSE;
-
-	if (vfsp->mnt_flags & MNT_NOATIME)
-		atime = B_FALSE;
-
-	/*
-	 * nbmand is a special property which may only be changed at
-	 * mount time.  Unfortunately, Linux does not have a VFS mount
-	 * flag instead this is a super block flag.  So setting this
-	 * option at mount time will have to wait until we can parse
-	 * the mount option string.  For now we rely on the nbmand
-	 * value stored with the object set.  Additional mount option
-	 * string to be handled:
-	 *
-	 *   case: sensitive|insensitive|mixed
-	 *   zerocopy: on|off
-	 */
-
-	dmu_objset_name(os, osname);
-	if ((error = dsl_prop_get_integer(osname, "nbmand", &nbmand, NULL)))
-		return (error);
 
 	/*
 	 * Register property callbacks.
@@ -351,20 +259,11 @@ zfs_register_callbacks(zfs_sb_t *zsb)
 	    "aclinherit", acl_inherit_changed_cb, zsb);
 	error = error ? error : dsl_prop_register(ds,
 	    "vscan", vscan_changed_cb, zsb);
+	error = error ? error : dsl_prop_register(ds,
+	    "nbmand", nbmand_changed_cb, zsb);
 	if (error)
 		goto unregister;
 
-	/*
-	 * Invoke our callbacks to set required flags.
-	 */
-	readonly_changed_cb(zsb, readonly);
-	setuid_changed_cb(zsb, setuid);
-	exec_changed_cb(zsb, exec);
-	devices_changed_cb(zsb, devices);
-	xattr_changed_cb(zsb, xattr);
-	atime_changed_cb(zsb, atime);
-	nbmand_changed_cb(zsb, nbmand);
-
 	return (0);
 
 unregister:
@@ -384,6 +283,7 @@ unregister:
 	(void) dsl_prop_unregister(ds, "aclinherit", acl_inherit_changed_cb,
 	    zsb);
 	(void) dsl_prop_unregister(ds, "vscan", vscan_changed_cb, zsb);
+	(void) dsl_prop_unregister(ds, "nbmand", nbmand_changed_cb, zsb);
 
 	return (error);
 }
@@ -694,7 +594,7 @@ zfs_sb_create(const char *osname, zfs_sb_t **zsbp)
 	 * Should probably make this a kmem cache, shuffle fields,
 	 * and just bzero up to z_hold_mtx[].
 	 */
-	zsb->z_vfs = NULL;
+	zsb->z_sb = NULL;
 	zsb->z_parent = zsb;
 	zsb->z_max_blksz = SPA_MAXBLOCKSIZE;
 	zsb->z_show_ctldir = ZFS_SNAPDIR_VISIBLE;
@@ -840,9 +740,9 @@ zfs_sb_setup(zfs_sb_t *zsb, boolean_t mounting)
 		 * During replay we remove the read only flag to
 		 * allow replays to succeed.
 		 */
-		readonly = zsb->z_vfs->mnt_flags & MNT_READONLY;
+		readonly = zfs_is_readonly(zsb);
 		if (readonly != 0)
-			zsb->z_vfs->mnt_flags &= ~MNT_READONLY;
+			readonly_changed_cb(zsb, B_FALSE);
 		else
 			zfs_unlinked_drain(zsb);
 
@@ -883,7 +783,10 @@ zfs_sb_setup(zfs_sb_t *zsb, boolean_t mounting)
 				zsb->z_replay = B_FALSE;
 			}
 		}
-		zsb->z_vfs->mnt_flags |= readonly; /* restore readonly bit */
+
+		/* restore readonly bit */
+		if (readonly != 0)
+			readonly_changed_cb(zsb, B_TRUE);
 	}
 
 	return (0);
@@ -954,6 +857,9 @@ zfs_unregister_callbacks(zfs_sb_t *zsb)
 
 		VERIFY(dsl_prop_unregister(ds, "vscan",
 		    vscan_changed_cb, zsb) == 0);
+
+		VERIFY(dsl_prop_unregister(ds, "nbmand",
+		    nbmand_changed_cb, zsb) == 0);
 	}
 }
 EXPORT_SYMBOL(zfs_unregister_callbacks);
@@ -1164,7 +1070,7 @@ zfsvfs_teardown(zfs_sb_t *zsb, boolean_t unmounting)
 	 * Evict cached data
 	 */
 	if (dmu_objset_is_dirty_anywhere(zsb->z_os))
-		if (!(zsb->z_vfs->mnt_flags & MNT_READONLY))
+		if (!zfs_is_readonly(zsb))
 			txg_wait_synced(dmu_objset_pool(zsb->z_os), 0);
 	(void) dmu_objset_evict_dbufs(zsb->z_os);
 
@@ -1181,17 +1087,6 @@ zfs_domount(struct super_block *sb, void *data, int silent)
 	uint64_t recordsize;
 	int error;
 
-	/*
-	 * Linux allows multiple vfs mounts per super block.  However, the
-	 * zfs_sb_t only contains a pointer for a single vfs mount.  This
-	 * back reference in the long term could be extended to a list of
-	 * vfs mounts if a hook were added to the kernel to notify us when
-	 * a vfsmount is destroyed.  Until then we must limit the number
-	 * of mounts per super block to one.
-	 */
-	if (atomic_read(&sb->s_active) > 1)
-		return (EBUSY);
-
 	error = zfs_sb_create(osname, &zsb);
 	if (error)
 		return (error);
@@ -1201,7 +1096,6 @@ zfs_domount(struct super_block *sb, void *data, int silent)
 		goto out;
 
 	zsb->z_sb = sb;
-	zsb->z_vfs = zmd->z_vfs;
 	sb->s_fs_info = zsb;
 	sb->s_magic = ZFS_SUPER_MAGIC;
 	sb->s_maxbytes = MAX_LFS_FILESIZE;
@@ -1298,47 +1192,18 @@ EXPORT_SYMBOL(zfs_umount);
 int
 zfs_remount(struct super_block *sb, int *flags, char *data)
 {
-	zfs_sb_t *zsb = sb->s_fs_info;
-	boolean_t readonly = B_FALSE;
-	boolean_t setuid = B_TRUE;
-	boolean_t exec = B_TRUE;
-	boolean_t devices = B_TRUE;
-	boolean_t atime = B_TRUE;
-
-	if (*flags & MS_RDONLY)
-		readonly = B_TRUE;
-
-	if (*flags & MS_NOSUID) {
-		devices = B_FALSE;
-		setuid = B_FALSE;
-	} else {
-		if (*flags & MS_NODEV)
-			devices = B_FALSE;
-	}
-
-	if (*flags & MS_NOEXEC)
-		exec = B_FALSE;
-
-	if (*flags & MS_NOATIME)
-		atime = B_FALSE;
-
 	/*
-	 * Invoke our callbacks to set required flags.
+	 * All namespace flags (MNT_*) and super block flags (MS_*) will
+	 * be handled by the Linux VFS.  Only handle custom options here.
 	 */
-	readonly_changed_cb(zsb, readonly);
-	setuid_changed_cb(zsb, setuid);
-	exec_changed_cb(zsb, exec);
-	devices_changed_cb(zsb, devices);
-	atime_changed_cb(zsb, atime);
-
 	return (0);
 }
 EXPORT_SYMBOL(zfs_remount);
 
 int
-zfs_vget(struct vfsmount *vfsp, struct inode **ipp, fid_t *fidp)
+zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp)
 {
-	zfs_sb_t	*zsb = VTOZSB(vfsp);
+	zfs_sb_t	*zsb = sb->s_fs_info;
 	znode_t		*zp;
 	uint64_t	object = 0;
 	uint64_t	fid_gen = 0;

module/zfs/zfs_vnops.c

@@ -1122,7 +1122,7 @@ zfs_lookup(struct inode *dip, char *nm, struct inode **ipp, int flags,
 		/*
 		 * If the xattr property is off, refuse the lookup request.
 		 */
-		if (!(zsb->z_flags & ZSB_XATTR_USER)) {
+		if (!(zsb->z_flags & ZSB_XATTR)) {
 			ZFS_EXIT(zsb);
 			return (EINVAL);
 		}
@@ -2420,7 +2420,7 @@ top:
 	aclp = NULL;
 
 	/* Can this be moved to before the top label? */
-	if (zsb->z_vfs->mnt_flags & MNT_READONLY) {
+	if (zfs_is_readonly(zsb)) {
 		err = EROFS;
 		goto out3;
 	}

module/zfs/zpl_export.c

@@ -73,8 +73,6 @@ static struct dentry *
 zpl_fh_to_dentry(struct super_block *sb, struct fid *fh,
     int fh_len, int fh_type)
 {
-	zfs_sb_t *zsb = sb->s_fs_info;
-	struct vfsmount *vfs = zsb->z_vfs;
 	fid_t *fid = (fid_t *)fh;
 	struct inode *ip;
 	int len_bytes, rc;
@@ -86,7 +84,7 @@ zpl_fh_to_dentry(struct super_block *sb, struct fid *fh,
 	    len_bytes < offsetof(fid_t, fid_data) + fid->fid_len)
 		return ERR_PTR(-EINVAL);
 
-	rc = zfs_vget(vfs, &ip, fid);
+	rc = zfs_vget(sb, &ip, fid);
 
 	if (rc != 0)
 		return ERR_PTR(-rc);

module/zfs/zpl_super.c

@@ -150,8 +150,7 @@ zpl_show_options(struct seq_file *seq, struct vfsmount *vfsp)
 	 * MNT_NOSUID, MNT_NODEV, MNT_NOEXEC, MNT_NOATIME, MNT_READONLY
 	 */
 
-	if (zsb->z_flags & ZSB_XATTR_USER)
+	seq_printf(seq, ",%s", zsb->z_flags & ZSB_XATTR ? "xattr" : "noxattr");
-		seq_printf(seq, ",%s", "xattr");
 
 	return (0);
 }
@@ -167,14 +166,25 @@ zpl_fill_super(struct super_block *sb, void *data, int silent)
 	return (error);
 }
 
+#ifdef HAVE_MOUNT_NODEV
+static struct dentry *
+zpl_mount(struct file_system_type *fs_type, int flags,
+    const char *osname, void *data)
+{
+	zpl_mount_data_t zmd = { osname, data };
+
+	return mount_nodev(fs_type, flags, &zmd, zpl_fill_super);
+}
+#else
 static int
 zpl_get_sb(struct file_system_type *fs_type, int flags,
     const char *osname, void *data, struct vfsmount *mnt)
 {
-	zpl_mount_data_t zmd = { osname, data, mnt };
+	zpl_mount_data_t zmd = { osname, data };
 
 	return get_sb_nodev(fs_type, flags, &zmd, zpl_fill_super, mnt);
 }
+#endif /* HAVE_MOUNT_NODEV */
 
 static void
 zpl_kill_sb(struct super_block *sb)
@@ -213,6 +223,10 @@ const struct super_operations zpl_super_operations = {
 struct file_system_type zpl_fs_type = {
 	.owner		= THIS_MODULE,
 	.name		= ZFS_DRIVER,
+#ifdef HAVE_MOUNT_NODEV
+	.mount		= zpl_mount,
+#else
 	.get_sb		= zpl_get_sb,
+#endif /* HAVE_MOUNT_NODEV */
 	.kill_sb	= zpl_kill_sb,
 };

module/zfs/zpl_xattr.c

@@ -83,7 +83,7 @@ zpl_xattr_filldir(void *arg, const char *name, int name_len,
 	xattr_filldir_t *xf = arg;
 
 	if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
-		if (!(ITOZSB(xf->inode)->z_flags & ZSB_XATTR_USER))
+		if (!(ITOZSB(xf->inode)->z_flags & ZSB_XATTR))
 			return (0);
 
 	if (!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN))
@@ -281,7 +281,7 @@ __zpl_xattr_user_get(struct inode *ip, const char *name,
 	if (strcmp(name, "") == 0)
 		return -EINVAL;
 
-	if (!(ITOZSB(ip)->z_flags & ZSB_XATTR_USER))
+	if (!(ITOZSB(ip)->z_flags & ZSB_XATTR))
 		return -EOPNOTSUPP;
 
 	xattr_name = kmem_asprintf("%s%s", XATTR_USER_PREFIX, name);
@@ -302,7 +302,7 @@ __zpl_xattr_user_set(struct inode *ip, const char *name,
 	if (strcmp(name, "") == 0)
 		return -EINVAL;
 
-	if (!(ITOZSB(ip)->z_flags & ZSB_XATTR_USER))
+	if (!(ITOZSB(ip)->z_flags & ZSB_XATTR))
 		return -EOPNOTSUPP;
 
 	xattr_name = kmem_asprintf("%s%s", XATTR_USER_PREFIX, name);

scripts/Makefile.in

@@ -62,6 +62,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

scripts/zpios-profile/Makefile.in

@@ -62,6 +62,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

scripts/zpios-test/Makefile.in

@@ -62,6 +62,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

scripts/zpool-config/Makefile.in

@@ -62,6 +62,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

scripts/zpool-layout/Makefile.in

@@ -62,6 +62,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-insert-inode-locked.m4 \
 	$(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \
 	$(top_srcdir)/config/kernel-kobj-name-len.m4 \
+	$(top_srcdir)/config/kernel-mount-nodev.m4 \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \

zfs_config.h.in

@@ -126,6 +126,9 @@
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
 
+/* mount_nodev() is available */
+#undef HAVE_MOUNT_NODEV
+
 /* open_bdev_exclusive() is available */
 #undef HAVE_OPEN_BDEV_EXCLUSIVE