Index: uspace/lib/ext4/libext4_superblock.c
===================================================================
--- uspace/lib/ext4/libext4_superblock.c	(revision 749fe15b74e83e98f982655fff497a808f7675f4)
+++ uspace/lib/ext4/libext4_superblock.c	(revision 6dd7f6525f0b5b7e368734300a7432f57ce97b0f)
@@ -1298,4 +1298,52 @@
 }
 
+/** Get the backup groups used with SPARSE_SUPER2
+ *
+ * @param sb    Pointer to the superblock
+ * @param g1    Output pointer to the first backup group
+ * @param g2    Output pointer to the second backup group
+ */
+void ext4_superblock_get_backup_groups_sparse2(ext4_superblock_t *sb,
+    uint32_t *g1, uint32_t *g2)
+{
+	*g1 = uint32_t_le2host(sb->backup_bgs[0]);
+	*g2 = uint32_t_le2host(sb->backup_bgs[1]);
+}
+
+/** Set the backup groups (SPARSE SUPER2)
+ *
+ * @param sb    Pointer to the superblock
+ * @param g1    Index of the first group
+ * @param g2    Index of the second group
+ */
+void ext4_superblock_set_backup_groups_sparse2(ext4_superblock_t *sb,
+    uint32_t g1, uint32_t g2)
+{
+	sb->backup_bgs[0] = host2uint32_t_le(g1);
+	sb->backup_bgs[1] = host2uint32_t_le(g2);
+}
+
+/** Get the number of blocks (per group) reserved to GDT expansion
+ *
+ * @param sb    Pointer to the superblock
+ *
+ * @return      Number of blocks
+ */
+uint32_t ext4_superblock_get_reserved_gdt_blocks(ext4_superblock_t *sb)
+{
+	return uint32_t_le2host(sb->reserved_gdt_blocks);
+}
+
+/** Set the number of blocks (per group) reserved to GDT expansion
+ *
+ * @param sb    Pointer to the superblock
+ * @param n     Number of reserved blocks
+ */
+void ext4_superblock_set_reserved_gdt_blocks(ext4_superblock_t *sb,
+    uint32_t n)
+{
+	sb->reserved_gdt_blocks = host2uint32_t_le(n);
+}
+
 /**
  * @}
Index: uspace/lib/ext4/libext4_superblock.h
===================================================================
--- uspace/lib/ext4/libext4_superblock.h	(revision 749fe15b74e83e98f982655fff497a808f7675f4)
+++ uspace/lib/ext4/libext4_superblock.h	(revision 6dd7f6525f0b5b7e368734300a7432f57ce97b0f)
@@ -135,4 +135,13 @@
 extern void ext4_superblock_set_flags(ext4_superblock_t *, uint32_t);
 
+extern void ext4_superblock_get_backup_groups_sparse2(ext4_superblock_t *sb,
+    uint32_t *g1, uint32_t *g2);
+extern void ext4_superblock_set_backup_groups_sparse2(ext4_superblock_t *sb,
+    uint32_t g1, uint32_t g2);
+
+extern uint32_t ext4_superblock_get_reserved_gdt_blocks(ext4_superblock_t *sb);
+extern void ext4_superblock_set_reserved_gdt_blocks(ext4_superblock_t *sb,
+    uint32_t n);
+
 /* More complex superblock functions */
 extern bool ext4_superblock_has_flag(ext4_superblock_t *, uint32_t);
Index: uspace/lib/ext4/libext4_types.h
===================================================================
--- uspace/lib/ext4/libext4_types.h	(revision 749fe15b74e83e98f982655fff497a808f7675f4)
+++ uspace/lib/ext4/libext4_types.h	(revision 6dd7f6525f0b5b7e368734300a7432f57ce97b0f)
@@ -83,7 +83,7 @@
 	 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 	 */
-	uint8_t s_prealloc_blocks;       /* Number of blocks to try to preallocate */
-	uint8_t s_prealloc_dir_blocks;   /* Number to preallocate for dirs */
-	uint16_t s_reserved_gdt_blocks;  /* Per group desc for online growth */
+	uint8_t prealloc_blocks;        /* Number of blocks to try to preallocate */
+	uint8_t prealloc_dir_blocks;    /* Number to preallocate for dirs */
+	uint16_t reserved_gdt_blocks;   /* Per group desc for online growth */
 	
 	/*
@@ -133,6 +133,11 @@
 	uint64_t last_error_block;          /* Block involved of last error */
 	uint8_t last_error_func[32];        /* Function where the error happened */
-	uint8_t mount_opts[64];
-	uint32_t padding[112];              /* Padding to the end of the block */
+	uint8_t mount_opts[64];             /* String containing the mount options */
+	uint32_t usr_quota_inum;            /* Inode number of user quota file */
+	uint32_t grp_quota_inum;            /* Inode number of group quota file */
+	uint32_t overhead_blocks;           /* Overhead blocks/clusters */
+	uint32_t backup_bgs[2];             /* Block groups containing superblock backups (if SPARSE_SUPER2) */
+	uint32_t encrypt_algos;             /* Encrypt algorithm in use */
+	uint32_t padding[105];              /* Padding to the end of the block */
 } __attribute__((packed)) ext4_superblock_t;
 
@@ -176,4 +181,5 @@
 #define EXT4_FEATURE_COMPAT_RESIZE_INODE   0x0010
 #define EXT4_FEATURE_COMPAT_DIR_INDEX      0x0020
+#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2  0x0200
 
 /*