1 files changed, 9 insertions, 1 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 73f3e60f7078..cc58aa8e9869 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -949,7 +949,7 @@ struct ext4_inode_info {
 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
 
 /*
- * Mount flags
+ * Mount flags set via mount options or defaults
  */
 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
@@ -981,8 +981,16 @@ struct ext4_inode_info {
 #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
 #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
 
+/*
+ * Mount flags set either automatically (could not be set by mount option)
+ * based on per file system feature or property or in special cases such as
+ * distinguishing between explicit mount option definition and default.
+ */
 #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
                                                       specified delalloc */
+#define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
+                                                      size of blocksize * 8
+                                                      blocks */
 
 #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
                                                 ~EXT4_MOUNT_##opt