/* 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 1

/*

 * 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_INO		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