1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 986b5d5d369f..527a09a82297 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -92,6 +92,7 @@ extern int dir_notify_enable;
 /* public flags for file_system_type */
 #define FS_REQUIRES_DEV 1 
 #define FS_BINARY_MOUNTDATA 2
+#define FS_HAS_SUBTYPE 4
 #define FS_REVAL_DOT    16384   /* Check the paths ".", ".." for staleness */
 #define FS_RENAME_DOES_D_MOVE   32768   /* FS will handle d_move()
                                          * during rename() internally.
@@ -961,6 +962,12 @@ struct super_block {
         /* Granularity of c/m/atime in ns.
            Cannot be worse than a second */
         u32                s_time_gran;
+
+        /*
+         * Filesystem subtype.  If non-empty the filesystem type field
+         * in /proc/mounts will be "type.subtype"
+         */
+        char *s_subtype;
 };
 
 extern struct timespec current_fs_time(struct super_block *sb);