fs/ext4/ext4.h

998 struct ext4_super_block {  struct
999 /*00*/	__le32	s_inodes_count;		/* Inodes count */
1000 	__le32	s_blocks_count_lo;	/* Blocks count */
1001 	__le32	s_r_blocks_count_lo;	/* Reserved blocks count */
1002 	__le32	s_free_blocks_count_lo;	/* Free blocks count */
1003 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
1004 	__le32	s_first_data_block;	/* First Data Block */
1005 	__le32	s_log_block_size;	/* Block size */
1006 	__le32	s_log_cluster_size;	/* Allocation cluster size */
1007 /*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */
1008 	__le32	s_clusters_per_group;	/* # Clusters per group */
1009 	__le32	s_inodes_per_group;	/* # Inodes per group */
1010 	__le32	s_mtime;		/* Mount time */
1011 /*30*/	__le32	s_wtime;		/* Write time */
1012 	__le16	s_mnt_count;		/* Mount count */
1013 	__le16	s_max_mnt_count;	/* Maximal mount count */
1014 	__le16	s_magic;		/* Magic signature */
1015 	__le16	s_state;		/* File system state */
1016 	__le16	s_errors;		/* Behaviour when detecting errors */
1017 	__le16	s_minor_rev_level;	/* minor revision level */
1018 /*40*/	__le32	s_lastcheck;		/* time of last check */
1019 	__le32	s_checkinterval;	/* max. time between checks */
1020 	__le32	s_creator_os;		/* OS */
1021 	__le32	s_rev_level;		/* Revision level */
1022 /*50*/	__le16	s_def_resuid;		/* Default uid for reserved blocks */
1023 	__le16	s_def_resgid;		/* Default gid for reserved blocks */
1037 	__le32	s_first_ino;		/* First non-reserved inode */
1038 	__le16  s_inode_size;		/* size of inode structure */
1039 	__le16	s_block_group_nr;	/* block group # of this superblock */
1040 	__le32	s_feature_compat;	/* compatible feature set */
1041 /*60*/	__le32	s_feature_incompat;	/* incompatible feature set */
1042 	__le32	s_feature_ro_compat;	/* readonly-compatible feature set */
1043 /*68*/	__u8	s_uuid[16];		/* 128-bit uuid for volume */
1044 /*78*/	char	s_volume_name[16];	/* volume name */
1045 /*88*/	char	s_last_mounted[64];	/* directory where last mounted */
1046 /*C8*/	__le32	s_algorithm_usage_bitmap; /* For compression */
1051 	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
1052 	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
1053 	__le16	s_reserved_gdt_blocks;	/* Per group desc for online growth */
1057 /*D0*/	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
1058 /*E0*/	__le32	s_journal_inum;		/* inode number of journal file */
1059 	__le32	s_journal_dev;		/* device number of journal file */
1060 	__le32	s_last_orphan;		/* start of list of inodes to delete */
1061 	__le32	s_hash_seed[4];		/* HTREE hash seed */
1062 	__u8	s_def_hash_version;	/* Default hash version to use */
1063 	__u8	s_jnl_backup_type;
1064 	__le16  s_desc_size;		/* size of group descriptor */
1065 /*100*/	__le32	s_default_mount_opts;
1066 	__le32	s_first_meta_bg;	/* First metablock block group */
1090 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)  argument
1102 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)  argument
1103 	__u8	s_mount_opts[64];
1104 	__le32	s_usr_quota_inum;	/* inode for tracking user quota */
1105 	__le32	s_grp_quota_inum;	/* inode for tracking group quota */
1106 	__le32	s_overhead_clusters;	/* overhead blocks/clusters in fs */
1107 	__le32  s_reserved[109];        /* Padding to the end of the block */