struct {			__u32  m_i_reserved1;		} masix1;	} osd1;				/* OS dependent 1 */	__u32	i_block[EXT2_N_BLOCKS];/* Pointers to blocks */	__u32	i_generation;	/* File version (for NFS) */	__u32	i_file_acl;	/* File ACL */	__u32	i_dir_acl;	/* Directory ACL */	__u32	i_faddr;	/* Fragment address */	union {		struct {			__u8	l_i_frag;	/* Fragment number */			__u8	l_i_fsize;	/* Fragment size */			__u16	i_pad1;			__u16	l_i_uid_high;	/* these 2 fields    */			__u16	l_i_gid_high;	/* were reserved2[0] */			__u32	l_i_reserved2;		} linux2;		struct {			__u8	h_i_frag;	/* Fragment number */			__u8	h_i_fsize;	/* Fragment size */			__u16	h_i_mode_high;			__u16	h_i_uid_high;			__u16	h_i_gid_high;			__u32	h_i_author;		} hurd2;		struct {			__u8	m_i_frag;	/* Fragment number */			__u8	m_i_fsize;	/* Fragment size */			__u16	m_pad1;			__u32	m_i_reserved2[2];		} masix2;	} osd2;				/* OS dependent 2 */	__u16	i_extra_isize;	__u16	i_pad1;};#define i_size_high	i_dir_acl/* * File system states */#define EXT2_VALID_FS			0x0001	/* Unmounted cleanly */#define EXT2_ERROR_FS			0x0002	/* Errors detected *//* * Mount flags */#define EXT2_MOUNT_CHECK		0x0001	/* Do mount-time checks */#define EXT2_MOUNT_GRPID		0x0004	/* Create files with directory's group */#define EXT2_MOUNT_DEBUG		0x0008	/* Some debugging messages */#define EXT2_MOUNT_ERRORS_CONT		0x0010	/* Continue on errors */#define EXT2_MOUNT_ERRORS_RO		0x0020	/* Remount fs ro on errors */#define EXT2_MOUNT_ERRORS_PANIC		0x0040	/* Panic on errors */#define EXT2_MOUNT_MINIX_DF		0x0080	/* Mimics the Minix statfs */#define EXT2_MOUNT_NO_UID32		0x0200  /* Disable 32-bit UIDs */#define clear_opt(o, opt)		o &= ~EXT2_MOUNT_##opt#define set_opt(o, opt)			o |= EXT2_MOUNT_##opt#define test_opt(sb, opt)		(EXT2_SB(sb)->s_mount_opt & \					 EXT2_MOUNT_##opt)/* * Maximal mount counts between two filesystem checks */#define EXT2_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */#define EXT2_DFL_CHECKINTERVAL		0	/* Don't use interval check *//* * Behaviour when detecting errors */#define EXT2_ERRORS_CONTINUE		1	/* Continue execution */#define EXT2_ERRORS_RO			2	/* Remount fs read-only */#define EXT2_ERRORS_PANIC		3	/* Panic */#define EXT2_ERRORS_DEFAULT		EXT2_ERRORS_CONTINUE/* * Structure of the super block */struct ext2_super_block {	__u32	s_inodes_count;		/* Inodes count */	__u32	s_blocks_count;		/* Blocks count */	__u32	s_r_blocks_count;	/* Reserved blocks count */	__u32	s_free_blocks_count;	/* Free blocks count */	__u32	s_free_inodes_count;	/* Free inodes count */	__u32	s_first_data_block;	/* First Data Block */	__u32	s_log_block_size;	/* Block size */	__s32	s_log_frag_size;	/* Fragment size */	__u32	s_blocks_per_group;	/* # Blocks per group */	__u32	s_frags_per_group;	/* # Fragments per group */	__u32	s_inodes_per_group;	/* # Inodes per group */	__u32	s_mtime;		/* Mount time */	__u32	s_wtime;		/* Write time */	__u16	s_mnt_count;		/* Mount count */	__s16	s_max_mnt_count;	/* Maximal mount count */	__u16	s_magic;		/* Magic signature */	__u16	s_state;		/* File system state */	__u16	s_errors;		/* Behaviour when detecting errors */	__u16	s_minor_rev_level;	/* minor revision level */	__u32	s_lastcheck;		/* time of last check */	__u32	s_checkinterval;	/* max. time between checks */	__u32	s_creator_os;		/* OS */	__u32	s_rev_level;		/* Revision level */	__u16	s_def_resuid;		/* Default uid for reserved blocks */	__u16	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...	 */	__u32	s_first_ino;		/* First non-reserved inode */	__u16   s_inode_size;		/* size of inode structure */	__u16	s_block_group_nr;	/* block group # of this superblock */	__u32	s_feature_compat;	/* compatible feature set */	__u32	s_feature_incompat;	/* incompatible feature set */	__u32	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 */	__u32	s_algorithm_usage_bitmap; /* For compression */	/*	 * Performance hints.  Directory preallocation should only	 * happen if the EXT2_FEATURE_COMPAT_DIR_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_reserved_gdt_blocks;	/* Per group table for online growth */	/*	 * Journaling support valid if EXT2_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_jnl_backup_type;	/* Default type of journal backup */	__u16	s_reserved_word_pad;	__u32	s_default_mount_opts;	__u32	s_first_meta_bg;	/* First metablock group */	__u32	s_mkfs_time;		/* When the filesystem was created */	__u32	s_jnl_blocks[17];	/* Backup of the journal inode */	__u32	s_reserved[172];	/* Padding to the end of the block */};/* * Codes for operating systems */#define EXT2_OS_LINUX		0#define EXT2_OS_HURD		1#define EXT2_OS_MASIX		2#define EXT2_OS_FREEBSD		3#define EXT2_OS_LITES		4/* * Revision levels */#define EXT2_GOOD_OLD_REV	0	/* The good old (original) format */#define EXT2_DYNAMIC_REV	1	/* V2 format w/ dynamic inode sizes */#define EXT2_CURRENT_REV	EXT2_GOOD_OLD_REV#define EXT2_MAX_SUPP_REV	EXT2_DYNAMIC_REV#define EXT2_GOOD_OLD_INODE_SIZE 128/* * Journal inode backup types */#define EXT3_JNL_BACKUP_BLOCKS	1/* * Feature set definitions */#define EXT2_HAS_COMPAT_FEATURE(sb,mask)			\	( EXT2_SB(sb)->s_feature_compat & (mask) )#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)			\	( EXT2_SB(sb)->s_feature_ro_compat & (mask) )#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)			\	( EXT2_SB(sb)->s_feature_incompat & (mask) )#define EXT2_FEATURE_COMPAT_DIR_PREALLOC	0x0001#define EXT2_FEATURE_COMPAT_IMAGIC_INODES	0x0002#define EXT3_FEATURE_COMPAT_HAS_JOURNAL		0x0004#define EXT2_FEATURE_COMPAT_EXT_ATTR		0x0008#define EXT2_FEATURE_COMPAT_RESIZE_INODE	0x0010#define EXT2_FEATURE_COMPAT_DIR_INDEX		0x0020#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE	0x0002/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR	0x0004 not used */#define EXT2_FEATURE_INCOMPAT_COMPRESSION	0x0001#define EXT2_FEATURE_INCOMPAT_FILETYPE		0x0002#define EXT3_FEATURE_INCOMPAT_RECOVER		0x0004 /* Needs recovery */#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008 /* Journal device */#define EXT2_FEATURE_INCOMPAT_META_BG		0x0010#define EXT3_FEATURE_INCOMPAT_EXTENTS		0x0040#define EXT2_FEATURE_COMPAT_SUPP	0#define EXT2_FEATURE_INCOMPAT_SUPP	(EXT2_FEATURE_INCOMPAT_FILETYPE)#define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \					 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)/* * Default values for user and/or group using reserved blocks */#define EXT2_DEF_RESUID		0#define EXT2_DEF_RESGID		0/* * Default mount options */#define EXT2_DEFM_DEBUG		0x0001#define EXT2_DEFM_BSDGROUPS	0x0002#define EXT2_DEFM_XATTR_USER	0x0004#define EXT2_DEFM_ACL		0x0008#define EXT2_DEFM_UID16		0x0010#define EXT3_DEFM_JMODE		0x0060#define EXT3_DEFM_JMODE_DATA	0x0020#define EXT3_DEFM_JMODE_ORDERED	0x0040#define EXT3_DEFM_JMODE_WBACK	0x0060/* * Structure of a directory entry */#define EXT2_NAME_LEN 255struct ext2_dir_entry {	__u32	inode;			/* Inode number */	__u16	rec_len;		/* Directory entry length */	__u16	name_len;		/* Name length */	char	name[EXT2_NAME_LEN];	/* File name */};/* * The new version of the directory entry.  Since EXT2 structures are * stored in intel byte order, and the name_len field could never be * bigger than 255 chars, it's safe to reclaim the extra byte for the * file_type field. */struct ext2_dir_entry_2 {	__u32	inode;			/* Inode number */	__u16	rec_len;		/* Directory entry length */	__u8	name_len;		/* Name length */	__u8	file_type;	char	name[EXT2_NAME_LEN];	/* File name */};/* * Ext2 directory file types.  Only the low 3 bits are used.  The * other bits are reserved for now. */#define EXT2_FT_UNKNOWN		0#define EXT2_FT_REG_FILE	1#define EXT2_FT_DIR		2#define EXT2_FT_CHRDEV		3#define EXT2_FT_BLKDEV		4#define EXT2_FT_FIFO		5#define EXT2_FT_SOCK		6#define EXT2_FT_SYMLINK		7#define EXT2_FT_MAX		8/* * EXT2_DIR_PAD defines the directory entries boundaries * * NOTE: It must be a multiple of 4 */#define EXT2_DIR_PAD			4#define EXT2_DIR_ROUND			(EXT2_DIR_PAD - 1)#define EXT2_DIR_REC_LEN(name_len)	(((name_len) + 8 + EXT2_DIR_ROUND) & \					 ~EXT2_DIR_ROUND)#endif	/* _LINUX_EXT2_FS_H */