ext4: Update ext2/3/4 superblock, group descriptor and inode structures

Most importantly, the superblock provides the used group descriptor size,
which is required for the EXT4_FEATURE_INCOMPAT_64BIT.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>

include/ext_common.h

@@ -99,6 +99,33 @@ struct ext2_sblock {
 	char volume_name[16];
 	char last_mounted_on[64];
 	__le32 compression_info;
+	uint8_t prealloc_blocks;
+	uint8_t prealloc_dir_blocks;
+	__le16 reserved_gdt_blocks;
+	uint8_t journal_uuid[16];
+	__le32 journal_inode;
+	__le32 journal_dev;
+	__le32 last_orphan;
+	__le32 hash_seed[4];
+	uint8_t default_hash_version;
+	uint8_t journal_backup_type;
+	__le16 descriptor_size;
+	__le32 default_mount_options;
+	__le32 first_meta_block_group;
+	__le32 mkfs_time;
+	__le32 journal_blocks[17];
+	__le32 total_blocks_high;
+	__le32 reserved_blocks_high;
+	__le32 free_blocks_high;
+	__le16 min_extra_inode_size;
+	__le16 want_extra_inode_size;
+	__le32 flags;
+	__le16 raid_stride;
+	__le16 mmp_interval;
+	__le64 mmp_block;
+	__le32 raid_stripe_width;
+	uint8_t log2_groups_per_flex;
+	uint8_t checksum_type;
 };
 
 struct ext2_block_group {
@@ -109,9 +136,23 @@ struct ext2_block_group {
 	__le16 free_inodes;	/* Free inodes count */
 	__le16 used_dir_cnt;	/* Directories count */
 	__le16 bg_flags;
-	__le32 bg_reserved[2];
+	__le32 bg_exclude_bitmap;
+	__le16 bg_block_id_csum;
+	__le16 bg_inode_id_csum;
 	__le16 bg_itable_unused; /* Unused inodes count */
-	__le16 bg_checksum;	/* crc16(s_uuid+grouo_num+group_desc)*/
+	__le16 bg_checksum;	/* crc16(s_uuid+group_num+group_desc)*/
+	/* following fields only exist if descriptor size is 64 */
+	__le32 block_id_high;
+	__le32 inode_id_high;
+	__le32 inode_table_id_high;
+	__le16 free_blocks_high;
+	__le16 free_inodes_high;
+	__le16 used_dir_cnt_high;
+	__le16 bg_itable_unused_high;
+	__le32 bg_exclude_bitmap_high;
+	__le16 bg_block_id_csum_high;
+	__le16 bg_inode_id_csum_high;
+	__le32 bg_reserved;
 };
 
 /* The ext2 inode. */
@@ -125,7 +166,7 @@ struct ext2_inode {
 	__le32 dtime;
 	__le16 gid;
 	__le16 nlinks;
-	__le32 blockcnt;	/* Blocks of 512 bytes!! */
+	__le32 blockcnt;	/* Blocks of either 512 or block_size bytes */
 	__le32 flags;
 	__le32 osd1;
 	union {
@@ -136,10 +177,11 @@ struct ext2_inode {
 			__le32 triple_indir_block;
 		} blocks;
 		char symlink[60];
+		char inline_data[60];
 	} b;
 	__le32 version;
 	__le32 acl;
-	__le32 dir_acl;
+	__le32 size_high;	/* previously dir_acl, but never used */
 	__le32 fragment_addr;
 	__le32 osd2[3];
 };