busybox/e2fsprogs/e2fs_defs.h

/* vi: set sw=4 ts=4: */
/*
 *  linux/include/linux/ext2_fs.h
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 * Copyright (C) 1991, 1992  Linus Torvalds
 */

#ifndef _LINUX_EXT2_FS_H
#define _LINUX_EXT2_FS_H

/*
 * Special inode numbers
 */
#define EXT2_BAD_INO		 1	/* Bad blocks inode */
#define EXT2_ROOT_INO		 2	/* Root inode */
#define EXT2_ACL_IDX_INO	 3	/* ACL inode */
#define EXT2_ACL_DATA_INO	 4	/* ACL inode */
#define EXT2_BOOT_LOADER_INO	 5	/* Boot loader inode */
#define EXT2_UNDEL_DIR_INO	 6	/* Undelete directory inode */
#define EXT2_RESIZE_INO		 7	/* Reserved group descriptors inode */
#define EXT2_JOURNAL_INO	 8	/* Journal inode */

/* First non-reserved inode for old ext2 filesystems */
#define EXT2_GOOD_OLD_FIRST_INO	11

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

/* Assume that user mode programs are passing in an ext2fs superblock, not
 * a kernel struct super_block.  This will allow us to call the feature-test
 * macros from user land. */
#define EXT2_SB(sb)	(sb)

/*
 * Maximal count of links to a file
 */
#define EXT2_LINK_MAX		32000

/*
 * Macro-instructions used to manage several block sizes
 */
#define EXT2_MIN_BLOCK_LOG_SIZE		10	/* 1024 */
#define EXT2_MAX_BLOCK_LOG_SIZE		16	/* 65536 */
#define EXT2_MIN_BLOCK_SIZE	(1 << EXT2_MIN_BLOCK_LOG_SIZE)
#define EXT2_MAX_BLOCK_SIZE	(1 << EXT2_MAX_BLOCK_LOG_SIZE)
#define EXT2_BLOCK_SIZE(s)	(EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
#define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
#define EXT2_INODE_SIZE(s)	(((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
				 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
#define EXT2_FIRST_INO(s)	(((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
				 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
#define EXT2_ADDR_PER_BLOCK(s)	(EXT2_BLOCK_SIZE(s) / sizeof(uint32_t))

/*
 * Macro-instructions used to manage fragments
 */
#define EXT2_MIN_FRAG_SIZE		EXT2_MIN_BLOCK_SIZE
#define EXT2_MAX_FRAG_SIZE		EXT2_MAX_BLOCK_SIZE
#define EXT2_MIN_FRAG_LOG_SIZE		EXT2_MIN_BLOCK_LOG_SIZE
#define EXT2_FRAG_SIZE(s)		(EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
#define EXT2_FRAGS_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))

/*
 * ACL structures
 */
struct ext2_acl_header {	/* Header of Access Control Lists */
	uint32_t	aclh_size;
	uint32_t	aclh_file_count;
	uint32_t	aclh_acle_count;
	uint32_t	aclh_first_acle;
};

struct ext2_acl_entry {	/* Access Control List Entry */
	uint32_t	acle_size;
	uint16_t	acle_perms;	/* Access permissions */
	uint16_t	acle_type;	/* Type of entry */
	uint16_t	acle_tag;	/* User or group identity */
	uint16_t	acle_pad1;
	uint32_t	acle_next;	/* Pointer on next entry for the */
					/* same inode or on next free entry */
};

/*
 * Structure of a blocks group descriptor
 */
struct ext2_group_desc {
	uint32_t	bg_block_bitmap;	/* Blocks bitmap block */
	uint32_t	bg_inode_bitmap;	/* Inodes bitmap block */
	uint32_t	bg_inode_table;		/* Inodes table block */
	uint16_t	bg_free_blocks_count;	/* Free blocks count */
	uint16_t	bg_free_inodes_count;	/* Free inodes count */
	uint16_t	bg_used_dirs_count;	/* Directories count */
	uint16_t	bg_pad;
	uint32_t	bg_reserved[3];
};

/*
 * Data structures used by the directory indexing feature
 *
 * Note: all of the multibyte integer fields are little endian.
 */

/*
 * Note: dx_root_info is laid out so that if it should somehow get
 * overlaid by a dirent the two low bits of the hash version will be
 * zero.  Therefore, the hash version mod 4 should never be 0.
 * Sincerely, the paranoia department.
 */
struct ext2_dx_root_info {
	uint32_t	reserved_zero;
	uint8_t		hash_version; /* 0 now, 1 at release */
	uint8_t		info_length; /* 8 */
	uint8_t		indirect_levels;
	uint8_t		unused_flags;
};

#define EXT2_HASH_LEGACY	0
#define EXT2_HASH_HALF_MD4	1
#define EXT2_HASH_TEA		2

#define EXT2_HASH_FLAG_INCOMPAT	0x1

struct ext2_dx_entry {
	uint32_t hash;
	uint32_t block;
};

struct ext2_dx_countlimit {
	uint16_t limit;
	uint16_t count;
};


/*
 * Macro-instructions used to manage group descriptors
 */
#define EXT2_BLOCKS_PER_GROUP(s)	(EXT2_SB(s)->s_blocks_per_group)
#define EXT2_INODES_PER_GROUP(s)	(EXT2_SB(s)->s_inodes_per_group)
#define EXT2_INODES_PER_BLOCK(s)	(EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
#define EXT2_MAX_BLOCKS_PER_GROUP(s)	((1 << 16) - 8)
#define EXT2_MAX_INODES_PER_GROUP(s)	((1 << 16) - EXT2_INODES_PER_BLOCK(s))
#define EXT2_DESC_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))

/*
 * Constants relative to the data blocks
 */
#define EXT2_NDIR_BLOCKS		12
#define EXT2_IND_BLOCK			EXT2_NDIR_BLOCKS
#define EXT2_DIND_BLOCK			(EXT2_IND_BLOCK + 1)
#define EXT2_TIND_BLOCK			(EXT2_DIND_BLOCK + 1)
#define EXT2_N_BLOCKS			(EXT2_TIND_BLOCK + 1)

/*
 * Inode flags
 */
#define EXT2_SECRM_FL			0x00000001 /* Secure deletion */
#define EXT2_UNRM_FL			0x00000002 /* Undelete */
#define EXT2_COMPR_FL			0x00000004 /* Compress file */
#define EXT2_SYNC_FL			0x00000008 /* Synchronous updates */
#define EXT2_IMMUTABLE_FL		0x00000010 /* Immutable file */
#define EXT2_APPEND_FL			0x00000020 /* writes to file may only append */
#define EXT2_NODUMP_FL			0x00000040 /* do not dump file */
#define EXT2_NOATIME_FL			0x00000080 /* do not update atime */
/* Reserved for compression usage... */
#define EXT2_DIRTY_FL			0x00000100
#define EXT2_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
#define EXT2_NOCOMPR_FL			0x00000400 /* Access raw compressed data */
#define EXT2_ECOMPR_FL			0x00000800 /* Compression error */
/* End compression flags --- maybe not all used */
#define EXT2_BTREE_FL			0x00001000 /* btree format dir */
#define EXT2_INDEX_FL			0x00001000 /* hash-indexed directory */
#define EXT2_IMAGIC_FL			0x00002000
#define EXT3_JOURNAL_DATA_FL		0x00004000 /* file data should be journaled */
#define EXT2_NOTAIL_FL			0x00008000 /* file tail should not be merged */
#define EXT2_DIRSYNC_FL			0x00010000 /* Synchronous directory modifications */
#define EXT2_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
#define EXT3_EXTENTS_FL			0x00080000 /* Inode uses extents */
#define EXT2_RESERVED_FL		0x80000000 /* reserved for ext2 lib */

#define EXT2_FL_USER_VISIBLE		0x0003DFFF /* User visible flags */
#define EXT2_FL_USER_MODIFIABLE		0x000080FF /* User modifiable flags */

/*
 * ioctl commands
 */
#define EXT2_IOC_GETFLAGS		_IOR('f', 1, long)
#define EXT2_IOC_SETFLAGS		_IOW('f', 2, long)
#define EXT2_IOC_GETVERSION		_IOR('v', 1, long)
#define EXT2_IOC_SETVERSION		_IOW('v', 2, long)

/*
 * Structure of an inode on the disk
 */
struct ext2_inode {
	uint16_t	i_mode;		/* File mode */
	uint16_t	i_uid;		/* Low 16 bits of Owner Uid */
	uint32_t	i_size;		/* Size in bytes */
	uint32_t	i_atime;	/* Access time */
	uint32_t	i_ctime;	/* Creation time */
	uint32_t	i_mtime;	/* Modification time */
	uint32_t	i_dtime;	/* Deletion Time */
	uint16_t	i_gid;		/* Low 16 bits of Group Id */
	uint16_t	i_links_count;	/* Links count */
	uint32_t	i_blocks;	/* Blocks count */
	uint32_t	i_flags;	/* File flags */
	union {
		struct {
			uint32_t  l_i_reserved1;
		} linux1;
		struct {
			uint32_t  h_i_translator;
		} hurd1;
		struct {
			uint32_t  m_i_reserved1;
		} masix1;
	} osd1;				/* OS dependent 1 */
	uint32_t	i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
	uint32_t	i_generation;	/* File version (for NFS) */
	uint32_t	i_file_acl;	/* File ACL */
	uint32_t	i_dir_acl;	/* Directory ACL */
	uint32_t	i_faddr;	/* Fragment address */
	union {
		struct {
			uint8_t		l_i_frag;	/* Fragment number */
			uint8_t		l_i_fsize;	/* Fragment size */
			uint16_t	i_pad1;
			uint16_t	l_i_uid_high;	/* these 2 fields    */
			uint16_t	l_i_gid_high;	/* were reserved2[0] */
			uint32_t	l_i_reserved2;
		} linux2;
		struct {
			uint8_t		h_i_frag;	/* Fragment number */
			uint8_t		h_i_fsize;	/* Fragment size */
			uint16_t	h_i_mode_high;
			uint16_t	h_i_uid_high;
			uint16_t	h_i_gid_high;
			uint32_t	h_i_author;
		} hurd2;
		struct {
			uint8_t		m_i_frag;	/* Fragment number */
			uint8_t		m_i_fsize;	/* Fragment size */
			uint16_t	m_pad1;
			uint32_t	m_i_reserved2[2];
		} masix2;
	} osd2;				/* OS dependent 2 */
};

/*
 * Permanent part of an large inode on the disk
 */
struct ext2_inode_large {
	uint16_t	i_mode;		/* File mode */
	uint16_t	i_uid;		/* Low 16 bits of Owner Uid */
	uint32_t	i_size;		/* Size in bytes */
	uint32_t	i_atime;	/* Access time */
	uint32_t	i_ctime;	/* Creation time */
	uint32_t	i_mtime;	/* Modification time */
	uint32_t	i_dtime;	/* Deletion Time */
	uint16_t	i_gid;		/* Low 16 bits of Group Id */
	uint16_t	i_links_count;	/* Links count */
	uint32_t	i_blocks;	/* Blocks count */
	uint32_t	i_flags;	/* File flags */
	union {
		struct {
			uint32_t  l_i_reserved1;
		} linux1;
		struct {
			uint32_t  h_i_translator;
		} hurd1;
		struct {
			uint32_t  m_i_reserved1;
		} masix1;
	} osd1;				/* OS dependent 1 */
	uint32_t	i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
	uint32_t	i_generation;	/* File version (for NFS) */
	uint32_t	i_file_acl;	/* File ACL */
	uint32_t	i_dir_acl;	/* Directory ACL */
	uint32_t	i_faddr;	/* Fragment address */
	union {
		struct {
			uint8_t		l_i_frag;	/* Fragment number */
			uint8_t		l_i_fsize;	/* Fragment size */
			uint16_t	i_pad1;
			uint16_t	l_i_uid_high;	/* these 2 fields    */
			uint16_t	l_i_gid_high;	/* were reserved2[0] */
			uint32_t	l_i_reserved2;
		} linux2;
		struct {
			uint8_t		h_i_frag;	/* Fragment number */
			uint8_t		h_i_fsize;	/* Fragment size */
			uint16_t	h_i_mode_high;
			uint16_t	h_i_uid_high;
			uint16_t	h_i_gid_high;
			uint32_t	h_i_author;
		} hurd2;
		struct {
			uint8_t		m_i_frag;	/* Fragment number */
			uint8_t		m_i_fsize;	/* Fragment size */
			uint16_t	m_pad1;
			uint32_t	m_i_reserved2[2];
		} masix2;
	} osd2;				/* OS dependent 2 */
	uint16_t	i_extra_isize;
	uint16_t	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 {
	uint32_t	s_inodes_count;		/* Inodes count */
	uint32_t	s_blocks_count;		/* Blocks count */
	uint32_t	s_r_blocks_count;	/* Reserved blocks count */
	uint32_t	s_free_blocks_count;	/* Free blocks count */
	uint32_t	s_free_inodes_count;	/* Free inodes count */
	uint32_t	s_first_data_block;	/* First Data Block */
	uint32_t	s_log_block_size;	/* Block size */
	int32_t		s_log_frag_size;	/* Fragment size */
	uint32_t	s_blocks_per_group;	/* # Blocks per group */
	uint32_t	s_frags_per_group;	/* # Fragments per group */
	uint32_t	s_inodes_per_group;	/* # Inodes per group */
	uint32_t	s_mtime;		/* Mount time */
	uint32_t	s_wtime;		/* Write time */
	uint16_t	s_mnt_count;		/* Mount count */
	int16_t		s_max_mnt_count;	/* Maximal mount count */
	uint16_t	s_magic;		/* Magic signature */
	uint16_t	s_state;		/* File system state */
	uint16_t	s_errors;		/* Behaviour when detecting errors */
	uint16_t	s_minor_rev_level;	/* minor revision level */
	uint32_t	s_lastcheck;		/* time of last check */
	uint32_t	s_checkinterval;	/* max. time between checks */
	uint32_t	s_creator_os;		/* OS */
	uint32_t	s_rev_level;		/* Revision level */
	uint16_t	s_def_resuid;		/* Default uid for reserved blocks */
	uint16_t	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...
	 */
	uint32_t	s_first_ino;		/* First non-reserved inode */
	uint16_t	s_inode_size;		/* size of inode structure */
	uint16_t	s_block_group_nr;	/* block group # of this superblock */
	uint32_t	s_feature_compat;	/* compatible feature set */
	uint32_t	s_feature_incompat;	/* incompatible feature set */
	uint32_t	s_feature_ro_compat;	/* readonly-compatible feature set */
	uint8_t		s_uuid[16];		/* 128-bit uuid for volume */
	char		s_volume_name[16];	/* volume name */
	char		s_last_mounted[64];	/* directory where last mounted */
	uint32_t	s_algorithm_usage_bitmap; /* For compression */
	/*
	 * Performance hints.  Directory preallocation should only
	 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
	 */
	uint8_t	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
	uint8_t	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
	uint16_t	s_reserved_gdt_blocks;	/* Per group table for online growth */
	/*
	 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
	 */
	uint8_t		s_journal_uuid[16];	/* uuid of journal superblock */
	uint32_t	s_journal_inum;		/* inode number of journal file */
	uint32_t	s_journal_dev;		/* device number of journal file */
	uint32_t	s_last_orphan;		/* start of list of inodes to delete */
	uint32_t	s_hash_seed[4];		/* HTREE hash seed */
	uint8_t		s_def_hash_version;	/* Default hash version to use */
	uint8_t		s_jnl_backup_type;	/* Default type of journal backup */
	uint16_t	s_reserved_word_pad;
	uint32_t	s_default_mount_opts;
	uint32_t	s_first_meta_bg;	/* First metablock group */
	uint32_t	s_mkfs_time;		/* When the filesystem was created */
	uint32_t	s_jnl_blocks[17];	/* Backup of the journal inode */
	uint32_t	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 255

struct ext2_dir_entry {
	uint32_t	inode;			/* Inode number */
	uint16_t	rec_len;		/* Directory entry length */
	uint16_t	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 {
	uint32_t	inode;			/* Inode number */
	uint16_t	rec_len;		/* Directory entry length */
	uint8_t		name_len;		/* Name length */
	uint8_t		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 */
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* linux/include/linux/ext2_fs.h
4			*
5			* Copyright (C) 1992, 1993, 1994, 1995
6			* Remy Card (card@masi.ibp.fr)
7			* Laboratoire MASI - Institut Blaise Pascal
8			* Universite Pierre et Marie Curie (Paris VI)
9			*
10			* Copyright (C) 1991, 1992 Linus Torvalds
11			*/
12
13			#ifndef _LINUX_EXT2_FS_H
14			#define _LINUX_EXT2_FS_H
15
16			/*
17			* Special inode numbers
18			*/
19			#define EXT2_BAD_INO 1 /* Bad blocks inode */
20			#define EXT2_ROOT_INO 2 /* Root inode */
21			#define EXT2_ACL_IDX_INO 3 /* ACL inode */
22			#define EXT2_ACL_DATA_INO 4 /* ACL inode */
23			#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
24			#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
25			#define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */
26			#define EXT2_JOURNAL_INO 8 /* Journal inode */
27
28			/* First non-reserved inode for old ext2 filesystems */
29			#define EXT2_GOOD_OLD_FIRST_INO 11
30
31			/*
32			* The second extended file system magic number
33			*/
34			#define EXT2_SUPER_MAGIC 0xEF53
35
36			/* Assume that user mode programs are passing in an ext2fs superblock, not
37			* a kernel struct super_block. This will allow us to call the feature-test
38			* macros from user land. */
39			#define EXT2_SB(sb) (sb)
40
41			/*
42			* Maximal count of links to a file
43			*/
44			#define EXT2_LINK_MAX 32000
45
46			/*
47			* Macro-instructions used to manage several block sizes
48			*/
49			#define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */
50			#define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */
51			#define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE)
52			#define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE)
53			#define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
54			#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
55			#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
56			EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
57			#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
58			EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
59			#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(uint32_t))
60
61			/*
62			* Macro-instructions used to manage fragments
63			*/
64			#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE
65			#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE
66			#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
67			#define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
68			#define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
69
70			/*
71			* ACL structures
72			*/
73			struct ext2_acl_header { /* Header of Access Control Lists */
74			uint32_t aclh_size;
75			uint32_t aclh_file_count;
76			uint32_t aclh_acle_count;
77			uint32_t aclh_first_acle;
78			};
79
80			struct ext2_acl_entry { /* Access Control List Entry */
81			uint32_t acle_size;
82			uint16_t acle_perms; /* Access permissions */
83			uint16_t acle_type; /* Type of entry */
84			uint16_t acle_tag; /* User or group identity */
85			uint16_t acle_pad1;
86			uint32_t acle_next; /* Pointer on next entry for the */
87			/* same inode or on next free entry */
88			};
89
90			/*
91			* Structure of a blocks group descriptor
92			*/
93			struct ext2_group_desc {
94			uint32_t bg_block_bitmap; /* Blocks bitmap block */
95			uint32_t bg_inode_bitmap; /* Inodes bitmap block */
96			uint32_t bg_inode_table; /* Inodes table block */
97			uint16_t bg_free_blocks_count; /* Free blocks count */
98			uint16_t bg_free_inodes_count; /* Free inodes count */
99			uint16_t bg_used_dirs_count; /* Directories count */
100			uint16_t bg_pad;
101			uint32_t bg_reserved[3];
102			};
103
104			/*
105			* Data structures used by the directory indexing feature
106			*
107			* Note: all of the multibyte integer fields are little endian.
108			*/
109
110			/*
111			* Note: dx_root_info is laid out so that if it should somehow get
112			* overlaid by a dirent the two low bits of the hash version will be
113			* zero. Therefore, the hash version mod 4 should never be 0.
114			* Sincerely, the paranoia department.
115			*/
116			struct ext2_dx_root_info {
117			uint32_t reserved_zero;
118			uint8_t hash_version; /* 0 now, 1 at release */
119			uint8_t info_length; /* 8 */
120			uint8_t indirect_levels;
121			uint8_t unused_flags;
122			};
123
124			#define EXT2_HASH_LEGACY 0
125			#define EXT2_HASH_HALF_MD4 1
126			#define EXT2_HASH_TEA 2
127
128			#define EXT2_HASH_FLAG_INCOMPAT 0x1
129
130			struct ext2_dx_entry {
131			uint32_t hash;
132			uint32_t block;
133			};
134
135			struct ext2_dx_countlimit {
136			uint16_t limit;
137			uint16_t count;
138			};
139
140
141			/*
142			* Macro-instructions used to manage group descriptors
143			*/
144			#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
145			#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
146			#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
147			/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
148			#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8)
149			#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s))
150			#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
151
152			/*
153			* Constants relative to the data blocks
154			*/
155			#define EXT2_NDIR_BLOCKS 12
156			#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
157			#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
158			#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
159			#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
160
161			/*
162			* Inode flags
163			*/
164			#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
165			#define EXT2_UNRM_FL 0x00000002 /* Undelete */
166			#define EXT2_COMPR_FL 0x00000004 /* Compress file */
167			#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
168			#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
169			#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
170			#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
171			#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
172			/* Reserved for compression usage... */
173			#define EXT2_DIRTY_FL 0x00000100
174			#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
175			#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */
176			#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
177			/* End compression flags --- maybe not all used */
178			#define EXT2_BTREE_FL 0x00001000 /* btree format dir */
179			#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */
180			#define EXT2_IMAGIC_FL 0x00002000
181			#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
182			#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
183			#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
184			#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
185			#define EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */
186			#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
187
188			#define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
189			#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */
190
191			/*
192			* ioctl commands
193			*/
194			#define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
195			#define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
196			#define EXT2_IOC_GETVERSION _IOR('v', 1, long)
197			#define EXT2_IOC_SETVERSION _IOW('v', 2, long)
198
199			/*
200			* Structure of an inode on the disk
201			*/
202			struct ext2_inode {
203			uint16_t i_mode; /* File mode */
204			uint16_t i_uid; /* Low 16 bits of Owner Uid */
205			uint32_t i_size; /* Size in bytes */
206			uint32_t i_atime; /* Access time */
207			uint32_t i_ctime; /* Creation time */
208			uint32_t i_mtime; /* Modification time */
209			uint32_t i_dtime; /* Deletion Time */
210			uint16_t i_gid; /* Low 16 bits of Group Id */
211			uint16_t i_links_count; /* Links count */
212			uint32_t i_blocks; /* Blocks count */
213			uint32_t i_flags; /* File flags */
214			union {
215			struct {
216			uint32_t l_i_reserved1;
217			} linux1;
218			struct {
219			uint32_t h_i_translator;
220			} hurd1;
221			struct {
222			uint32_t m_i_reserved1;
223			} masix1;
224			} osd1; /* OS dependent 1 */
225			uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
226			uint32_t i_generation; /* File version (for NFS) */
227			uint32_t i_file_acl; /* File ACL */
228			uint32_t i_dir_acl; /* Directory ACL */
229			uint32_t i_faddr; /* Fragment address */
230			union {
231			struct {
232			uint8_t l_i_frag; /* Fragment number */
233			uint8_t l_i_fsize; /* Fragment size */
234			uint16_t i_pad1;
235			uint16_t l_i_uid_high; /* these 2 fields */
236			uint16_t l_i_gid_high; /* were reserved2[0] */
237			uint32_t l_i_reserved2;
238			} linux2;
239			struct {
240			uint8_t h_i_frag; /* Fragment number */
241			uint8_t h_i_fsize; /* Fragment size */
242			uint16_t h_i_mode_high;
243			uint16_t h_i_uid_high;
244			uint16_t h_i_gid_high;
245			uint32_t h_i_author;
246			} hurd2;
247			struct {
248			uint8_t m_i_frag; /* Fragment number */
249			uint8_t m_i_fsize; /* Fragment size */
250			uint16_t m_pad1;
251			uint32_t m_i_reserved2[2];
252			} masix2;
253			} osd2; /* OS dependent 2 */
254			};
255
256			/*
257			* Permanent part of an large inode on the disk
258			*/
259			struct ext2_inode_large {
260			uint16_t i_mode; /* File mode */
261			uint16_t i_uid; /* Low 16 bits of Owner Uid */
262			uint32_t i_size; /* Size in bytes */
263			uint32_t i_atime; /* Access time */
264			uint32_t i_ctime; /* Creation time */
265			uint32_t i_mtime; /* Modification time */
266			uint32_t i_dtime; /* Deletion Time */
267			uint16_t i_gid; /* Low 16 bits of Group Id */
268			uint16_t i_links_count; /* Links count */
269			uint32_t i_blocks; /* Blocks count */
270			uint32_t i_flags; /* File flags */
271			union {
272			struct {
273			uint32_t l_i_reserved1;
274			} linux1;
275			struct {
276			uint32_t h_i_translator;
277			} hurd1;
278			struct {
279			uint32_t m_i_reserved1;
280			} masix1;
281			} osd1; /* OS dependent 1 */
282			uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
283			uint32_t i_generation; /* File version (for NFS) */
284			uint32_t i_file_acl; /* File ACL */
285			uint32_t i_dir_acl; /* Directory ACL */
286			uint32_t i_faddr; /* Fragment address */
287			union {
288			struct {
289			uint8_t l_i_frag; /* Fragment number */
290			uint8_t l_i_fsize; /* Fragment size */
291			uint16_t i_pad1;
292			uint16_t l_i_uid_high; /* these 2 fields */
293			uint16_t l_i_gid_high; /* were reserved2[0] */
294			uint32_t l_i_reserved2;
295			} linux2;
296			struct {
297			uint8_t h_i_frag; /* Fragment number */
298			uint8_t h_i_fsize; /* Fragment size */
299			uint16_t h_i_mode_high;
300			uint16_t h_i_uid_high;
301			uint16_t h_i_gid_high;
302			uint32_t h_i_author;
303			} hurd2;
304			struct {
305			uint8_t m_i_frag; /* Fragment number */
306			uint8_t m_i_fsize; /* Fragment size */
307			uint16_t m_pad1;
308			uint32_t m_i_reserved2[2];
309			} masix2;
310			} osd2; /* OS dependent 2 */
311			uint16_t i_extra_isize;
312			uint16_t i_pad1;
313			};
314
315			#define i_size_high i_dir_acl
316
317			/*
318			* File system states
319			*/
320			#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
321			#define EXT2_ERROR_FS 0x0002 /* Errors detected */
322
323			/*
324			* Mount flags
325			*/
326			#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */
327			#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
328			#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
329			#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
330			#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
331			#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
332			#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
333			#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */
334
335			#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
336			#define set_opt(o, opt) o \|= EXT2_MOUNT_##opt
337			#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
338			EXT2_MOUNT_##opt)
339			/*
340			* Maximal mount counts between two filesystem checks
341			*/
342			#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
343			#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
344
345			/*
346			* Behaviour when detecting errors
347			*/
348			#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
349			#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
350			#define EXT2_ERRORS_PANIC 3 /* Panic */
351			#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
352
353			/*
354			* Structure of the super block
355			*/
356			struct ext2_super_block {
357			uint32_t s_inodes_count; /* Inodes count */
358			uint32_t s_blocks_count; /* Blocks count */
359			uint32_t s_r_blocks_count; /* Reserved blocks count */
360			uint32_t s_free_blocks_count; /* Free blocks count */
361			uint32_t s_free_inodes_count; /* Free inodes count */
362			uint32_t s_first_data_block; /* First Data Block */
363			uint32_t s_log_block_size; /* Block size */
364			int32_t s_log_frag_size; /* Fragment size */
365			uint32_t s_blocks_per_group; /* # Blocks per group */
366			uint32_t s_frags_per_group; /* # Fragments per group */
367			uint32_t s_inodes_per_group; /* # Inodes per group */
368			uint32_t s_mtime; /* Mount time */
369			uint32_t s_wtime; /* Write time */
370			uint16_t s_mnt_count; /* Mount count */
371			int16_t s_max_mnt_count; /* Maximal mount count */
372			uint16_t s_magic; /* Magic signature */
373			uint16_t s_state; /* File system state */
374			uint16_t s_errors; /* Behaviour when detecting errors */
375			uint16_t s_minor_rev_level; /* minor revision level */
376			uint32_t s_lastcheck; /* time of last check */
377			uint32_t s_checkinterval; /* max. time between checks */
378			uint32_t s_creator_os; /* OS */
379			uint32_t s_rev_level; /* Revision level */
380			uint16_t s_def_resuid; /* Default uid for reserved blocks */
381			uint16_t s_def_resgid; /* Default gid for reserved blocks */
382			/*
383			* These fields are for EXT2_DYNAMIC_REV superblocks only.
384			*
385			* Note: the difference between the compatible feature set and
386			* the incompatible feature set is that if there is a bit set
387			* in the incompatible feature set that the kernel doesn't
388			* know about, it should refuse to mount the filesystem.
389			*
390			* e2fsck's requirements are more strict; if it doesn't know
391			* about a feature in either the compatible or incompatible
392			* feature set, it must abort and not try to meddle with
393			* things it doesn't understand...
394			*/
395			uint32_t s_first_ino; /* First non-reserved inode */
396			uint16_t s_inode_size; /* size of inode structure */
397			uint16_t s_block_group_nr; /* block group # of this superblock */
398			uint32_t s_feature_compat; /* compatible feature set */
399			uint32_t s_feature_incompat; /* incompatible feature set */
400			uint32_t s_feature_ro_compat; /* readonly-compatible feature set */
401			uint8_t s_uuid[16]; /* 128-bit uuid for volume */
402			char s_volume_name[16]; /* volume name */
403			char s_last_mounted[64]; /* directory where last mounted */
404			uint32_t s_algorithm_usage_bitmap; /* For compression */
405			/*
406			* Performance hints. Directory preallocation should only
407			* happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
408			*/
409			uint8_t s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
410			uint8_t s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
411			uint16_t s_reserved_gdt_blocks; /* Per group table for online growth */
412			/*
413			* Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
414			*/
415			uint8_t s_journal_uuid[16]; /* uuid of journal superblock */
416			uint32_t s_journal_inum; /* inode number of journal file */
417			uint32_t s_journal_dev; /* device number of journal file */
418			uint32_t s_last_orphan; /* start of list of inodes to delete */
419			uint32_t s_hash_seed[4]; /* HTREE hash seed */
420			uint8_t s_def_hash_version; /* Default hash version to use */
421			uint8_t s_jnl_backup_type; /* Default type of journal backup */
422			uint16_t s_reserved_word_pad;
423			uint32_t s_default_mount_opts;
424			uint32_t s_first_meta_bg; /* First metablock group */
425			uint32_t s_mkfs_time; /* When the filesystem was created */
426			uint32_t s_jnl_blocks[17]; /* Backup of the journal inode */
427			uint32_t s_reserved[172]; /* Padding to the end of the block */
428			};
429
430			/*
431			* Codes for operating systems
432			*/
433			#define EXT2_OS_LINUX 0
434			#define EXT2_OS_HURD 1
435			#define EXT2_OS_MASIX 2
436			#define EXT2_OS_FREEBSD 3
437			#define EXT2_OS_LITES 4
438
439			/*
440			* Revision levels
441			*/
442			#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
443			#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
444
445			#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
446			#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
447
448			#define EXT2_GOOD_OLD_INODE_SIZE 128
449
450			/*
451			* Journal inode backup types
452			*/
453			#define EXT3_JNL_BACKUP_BLOCKS 1
454
455			/*
456			* Feature set definitions
457			*/
458
459			#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
460			( EXT2_SB(sb)->s_feature_compat & (mask) )
461			#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
462			( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
463			#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
464			( EXT2_SB(sb)->s_feature_incompat & (mask) )
465
466			#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
467			#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
468			#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
469			#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
470			#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
471			#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
472
473			#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
474			#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
475			/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */
476
477			#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
478			#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
479			#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
480			#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
481			#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
482			#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040
483
484
485			#define EXT2_FEATURE_COMPAT_SUPP 0
486			#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE)
487			#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER\| \
488			EXT2_FEATURE_RO_COMPAT_LARGE_FILE\| \
489			EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
490
491			/*
492			* Default values for user and/or group using reserved blocks
493			*/
494			#define EXT2_DEF_RESUID 0
495			#define EXT2_DEF_RESGID 0
496
497			/*
498			* Default mount options
499			*/
500			#define EXT2_DEFM_DEBUG 0x0001
501			#define EXT2_DEFM_BSDGROUPS 0x0002
502			#define EXT2_DEFM_XATTR_USER 0x0004
503			#define EXT2_DEFM_ACL 0x0008
504			#define EXT2_DEFM_UID16 0x0010
505			#define EXT3_DEFM_JMODE 0x0060
506			#define EXT3_DEFM_JMODE_DATA 0x0020
507			#define EXT3_DEFM_JMODE_ORDERED 0x0040
508			#define EXT3_DEFM_JMODE_WBACK 0x0060
509
510			/*
511			* Structure of a directory entry
512			*/
513			#define EXT2_NAME_LEN 255
514
515			struct ext2_dir_entry {
516			uint32_t inode; /* Inode number */
517			uint16_t rec_len; /* Directory entry length */
518			uint16_t name_len; /* Name length */
519			char name[EXT2_NAME_LEN]; /* File name */
520			};
521
522			/*
523			* The new version of the directory entry. Since EXT2 structures are
524			* stored in intel byte order, and the name_len field could never be
525			* bigger than 255 chars, it's safe to reclaim the extra byte for the
526			* file_type field.
527			*/
528			struct ext2_dir_entry_2 {
529			uint32_t inode; /* Inode number */
530			uint16_t rec_len; /* Directory entry length */
531			uint8_t name_len; /* Name length */
532			uint8_t file_type;
533			char name[EXT2_NAME_LEN]; /* File name */
534			};
535
536			/*
537			* Ext2 directory file types. Only the low 3 bits are used. The
538			* other bits are reserved for now.
539			*/
540			#define EXT2_FT_UNKNOWN 0
541			#define EXT2_FT_REG_FILE 1
542			#define EXT2_FT_DIR 2
543			#define EXT2_FT_CHRDEV 3
544			#define EXT2_FT_BLKDEV 4
545			#define EXT2_FT_FIFO 5
546			#define EXT2_FT_SOCK 6
547			#define EXT2_FT_SYMLINK 7
548
549			#define EXT2_FT_MAX 8
550
551			/*
552			* EXT2_DIR_PAD defines the directory entries boundaries
553			*
554			* NOTE: It must be a multiple of 4
555			*/
556			#define EXT2_DIR_PAD 4
557			#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
558			#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
559			~EXT2_DIR_ROUND)
560
561			#endif /* _LINUX_EXT2_FS_H */