diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index cb21318..8735105 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -50,6 +50,7 @@
 #define EXT2_UNDEL_DIR_INO	 6	/* Undelete directory inode */
 #define EXT2_RESIZE_INO		 7	/* Reserved group descriptors inode */
 #define EXT2_JOURNAL_INO	 8	/* Journal inode */
+#define EXT2_EXCLUDE_INO	 9	/* The "exclude" inode, for snapshots */
 
 /* First non-reserved inode for old ext2 filesystems */
 #define EXT2_GOOD_OLD_FIRST_INO	11
@@ -275,6 +276,9 @@ struct ext2_dx_countlimit {
 #define EXT4_EXTENTS_FL 		0x00080000 /* Inode uses extents */
 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
 #define EXT4_EOFBLOCKS_FL		0x00400000 /* Blocks allocated beyond EOF */
+#define EXT4_SNAPFILE_FL		0x01000000  /* Inode is a snapshot */
+#define EXT4_SNAPFILE_DELETED_FL	0x04000000  /* Snapshot is being deleted */
+#define EXT4_SNAPFILE_SHRUNK_FL		0x08000000  /* Snapshot shrink has completed */
 #define EXT2_RESERVED_FL		0x80000000 /* reserved for ext2 lib */
 
 #define EXT2_FL_USER_VISIBLE		0x004BDFFF /* User visible flags */
@@ -463,6 +467,9 @@ struct ext2_inode_large {
 #define EXT2_FLAGS_SIGNED_HASH		0x0001  /* Signed dirhash in use */
 #define EXT2_FLAGS_UNSIGNED_HASH	0x0002  /* Unsigned dirhash in use */
 #define EXT2_FLAGS_TEST_FILESYS		0x0004	/* OK for use on development code */
+#define EXT2_FLAGS_IS_SNAPSHOT		0x0010	/* This is a snapshot image */
+#define EXT2_FLAGS_FIX_SNAPSHOT		0x0020	/* Snapshot inodes corrupted */
+#define EXT2_FLAGS_FIX_EXCLUDE		0x0040	/* Exclude bitmaps corrupted */
 
 /*
  * Mount flags
@@ -582,7 +589,12 @@ struct ext2_super_block {
 	__u8    s_reserved_char_pad;
 	__u16	s_reserved_pad;		/* Padding to next 32bits */
 	__u64	s_kbytes_written;	/* nr of lifetime kilobytes written */
-	__u32   s_reserved[160];        /* Padding to the end of the block */
+	__u32	s_snapshot_inum;	/* Inode number of active snapshot */
+	__u32	s_snapshot_id;		/* sequential ID of active snapshot */
+	__u64	s_snapshot_r_blocks_count; /* reserved blocks for active
+					      snapshot's future use */
+	__u32	s_snapshot_list;	/* inode number of the head of the on-disk snapshot list */
+	__u32   s_reserved[155];        /* Padding to the end of the block */
 };
 
 /*
@@ -628,6 +640,7 @@ struct ext2_super_block {
 #define EXT2_FEATURE_COMPAT_RESIZE_INODE	0x0010
 #define EXT2_FEATURE_COMPAT_DIR_INDEX		0x0020
 #define EXT2_FEATURE_COMPAT_LAZY_BG		0x0040
+#define EXT2_FEATURE_COMPAT_EXCLUDE_INODE	0x0080
 
 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
@@ -636,6 +649,7 @@ struct ext2_super_block {
 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
+#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT	0x0080
 
 #define EXT2_FEATURE_INCOMPAT_COMPRESSION	0x0001
 #define EXT2_FEATURE_INCOMPAT_FILETYPE		0x0002