kinit/fstype/ext2_fs.h

#ifndef __EXT2_FS_H
#define __EXT2_FS_H

/*
 * The second extended file system magic number
 */
#define EXT2_SUPER_MAGIC	0xEF53

/*
 * Structure of the super block
 */
struct ext2_super_block {
	__le32 s_inodes_count;	/* Inodes count */
	__le32 s_blocks_count;	/* Blocks count */
	__le32 s_r_blocks_count;	/* Reserved blocks count */
	__le32 s_free_blocks_count;	/* Free blocks count */
	__le32 s_free_inodes_count;	/* Free inodes count */
	__le32 s_first_data_block;	/* First Data Block */
	__le32 s_log_block_size;	/* Block size */
	__le32 s_log_frag_size;	/* Fragment size */
	__le32 s_blocks_per_group;	/* # Blocks per group */
	__le32 s_frags_per_group;	/* # Fragments per group */
	__le32 s_inodes_per_group;	/* # Inodes per group */
	__le32 s_mtime;		/* Mount time */
	__le32 s_wtime;		/* Write time */
	__le16 s_mnt_count;	/* Mount count */
	__le16 s_max_mnt_count;	/* Maximal mount count */
	__le16 s_magic;		/* Magic signature */
	__le16 s_state;		/* File system state */
	__le16 s_errors;	/* Behaviour when detecting errors */
	__le16 s_minor_rev_level;	/* minor revision level */
	__le32 s_lastcheck;	/* time of last check */
	__le32 s_checkinterval;	/* max. time between checks */
	__le32 s_creator_os;	/* OS */
	__le32 s_rev_level;	/* Revision level */
	__le16 s_def_resuid;	/* Default uid for reserved blocks */
	__le16 s_def_resgid;	/* Default gid for reserved blocks */
	/*
	 * These fields are for EXT2_DYNAMIC_REV superblocks only.
	 *
	 * Note: the difference between the compatible feature set and
	 * the incompatible feature set is that if there is a bit set
	 * in the incompatible feature set that the kernel doesn't
	 * know about, it should refuse to mount the filesystem.
	 *
	 * e2fsck's requirements are more strict; if it doesn't know
	 * about a feature in either the compatible or incompatible
	 * feature set, it must abort and not try to meddle with
	 * things it doesn't understand...
	 */
	__le32 s_first_ino;	/* First non-reserved inode */
	__le16 s_inode_size;	/* size of inode structure */
	__le16 s_block_group_nr;	/* block group # of this superblock */
	__le32 s_feature_compat;	/* compatible feature set */
	__le32 s_feature_incompat;	/* incompatible feature set */
	__le32 s_feature_ro_compat;	/* readonly-compatible feature set */
	__u8 s_uuid[16];	/* 128-bit uuid for volume */
	char s_volume_name[16];	/* volume name */
	char s_last_mounted[64];	/* directory where last mounted */
	__le32 s_algorithm_usage_bitmap;	/* For compression */
	/*
	 * Performance hints.  Directory preallocation should only
	 * happen if the EXT2_COMPAT_PREALLOC flag is on.
	 */
	__u8 s_prealloc_blocks;	/* Nr of blocks to try to preallocate */
	__u8 s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
	__u16 s_padding1;
	/*
	 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
	 */
	__u8 s_journal_uuid[16];	/* uuid of journal superblock */
	__u32 s_journal_inum;	/* inode number of journal file */
	__u32 s_journal_dev;	/* device number of journal file */
	__u32 s_last_orphan;	/* start of list of inodes to delete */
	__u32 s_hash_seed[4];	/* HTREE hash seed */
	__u8 s_def_hash_version;	/* Default hash version to use */
	__u8 s_reserved_char_pad;
	__u16 s_reserved_word_pad;
	__le32 s_default_mount_opts;
	__le32 s_first_meta_bg;	/* First metablock block group */
	__u32 s_reserved[190];	/* Padding to the end of the block */
};

#endif /* __EXT2_FS_H */
1	#ifndef __EXT2_FS_H
2	#define __EXT2_FS_H
3
4	/*
5	* The second extended file system magic number
6	*/
7	#define EXT2_SUPER_MAGIC 0xEF53
8
9	/*
10	* Structure of the super block
11	*/
12	struct ext2_super_block {
13	__le32 s_inodes_count; /* Inodes count */
14	__le32 s_blocks_count; /* Blocks count */
15	__le32 s_r_blocks_count; /* Reserved blocks count */
16	__le32 s_free_blocks_count; /* Free blocks count */
17	__le32 s_free_inodes_count; /* Free inodes count */
18	__le32 s_first_data_block; /* First Data Block */
19	__le32 s_log_block_size; /* Block size */
20	__le32 s_log_frag_size; /* Fragment size */
21	__le32 s_blocks_per_group; /* # Blocks per group */
22	__le32 s_frags_per_group; /* # Fragments per group */
23	__le32 s_inodes_per_group; /* # Inodes per group */
24	__le32 s_mtime; /* Mount time */
25	__le32 s_wtime; /* Write time */
26	__le16 s_mnt_count; /* Mount count */
27	__le16 s_max_mnt_count; /* Maximal mount count */
28	__le16 s_magic; /* Magic signature */
29	__le16 s_state; /* File system state */
30	__le16 s_errors; /* Behaviour when detecting errors */
31	__le16 s_minor_rev_level; /* minor revision level */
32	__le32 s_lastcheck; /* time of last check */
33	__le32 s_checkinterval; /* max. time between checks */
34	__le32 s_creator_os; /* OS */
35	__le32 s_rev_level; /* Revision level */
36	__le16 s_def_resuid; /* Default uid for reserved blocks */
37	__le16 s_def_resgid; /* Default gid for reserved blocks */
38	/*
39	* These fields are for EXT2_DYNAMIC_REV superblocks only.
40	*
41	* Note: the difference between the compatible feature set and
42	* the incompatible feature set is that if there is a bit set
43	* in the incompatible feature set that the kernel doesn't
44	* know about, it should refuse to mount the filesystem.
45	*
46	* e2fsck's requirements are more strict; if it doesn't know
47	* about a feature in either the compatible or incompatible
48	* feature set, it must abort and not try to meddle with
49	* things it doesn't understand...
50	*/
51	__le32 s_first_ino; /* First non-reserved inode */
52	__le16 s_inode_size; /* size of inode structure */
53	__le16 s_block_group_nr; /* block group # of this superblock */
54	__le32 s_feature_compat; /* compatible feature set */
55	__le32 s_feature_incompat; /* incompatible feature set */
56	__le32 s_feature_ro_compat; /* readonly-compatible feature set */
57	__u8 s_uuid[16]; /* 128-bit uuid for volume */
58	char s_volume_name[16]; /* volume name */
59	char s_last_mounted[64]; /* directory where last mounted */
60	__le32 s_algorithm_usage_bitmap; /* For compression */
61	/*
62	* Performance hints. Directory preallocation should only
63	* happen if the EXT2_COMPAT_PREALLOC flag is on.
64	*/
65	__u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate */
66	__u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
67	__u16 s_padding1;
68	/*
69	* Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
70	*/
71	__u8 s_journal_uuid[16]; /* uuid of journal superblock */
72	__u32 s_journal_inum; /* inode number of journal file */
73	__u32 s_journal_dev; /* device number of journal file */
74	__u32 s_last_orphan; /* start of list of inodes to delete */
75	__u32 s_hash_seed[4]; /* HTREE hash seed */
76	__u8 s_def_hash_version; /* Default hash version to use */
77	__u8 s_reserved_char_pad;
78	__u16 s_reserved_word_pad;
79	__le32 s_default_mount_opts;
80	__le32 s_first_meta_bg; /* First metablock block group */
81	__u32 s_reserved[190]; /* Padding to the end of the block */
82	};
83
84	#endif /* __EXT2_FS_H */