/* 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) * *  from * *  linux/include/linux/minix_fs.h * *  Copyright (C) 1991, 1992  Linus Torvalds */#ifndef _LINUX_EXT2_FS_H#define _LINUX_EXT2_FS_H#include "ext2_types.h"		/* Changed from linux/types.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(__u32))/* * 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 */{	__u32	aclh_size;	__u32	aclh_file_count;	__u32	aclh_acle_count;	__u32	aclh_first_acle;};struct ext2_acl_entry	/* Access Control List Entry */{	__u32	acle_size;	__u16	acle_perms;	/* Access permissions */	__u16	acle_type;	/* Type of entry */	__u16	acle_tag;	/* User or group identity */	__u16	acle_pad1;	__u32	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{	__u32	bg_block_bitmap;		/* Blocks bitmap block */	__u32	bg_inode_bitmap;		/* Inodes bitmap block */	__u32	bg_inode_table;		/* Inodes table block */	__u16	bg_free_blocks_count;	/* Free blocks count */	__u16	bg_free_inodes_count;	/* Free inodes count */	__u16	bg_used_dirs_count;	/* Directories count */	__u16	bg_pad;	__u32	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 {	__u32 reserved_zero;	__u8 hash_version; /* 0 now, 1 at release */	__u8 info_length; /* 8 */	__u8 indirect_levels;	__u8 unused_flags;};#define EXT2_HASH_LEGACY	0#define EXT2_HASH_HALF_MD4	1#define EXT2_HASH_TEA		2#define EXT2_HASH_FLAG_INCOMPAT	0x1struct ext2_dx_entry {	__u32 hash;	__u32 block;};struct ext2_dx_countlimit {	__u16 limit;	__u16 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 {	__u16	i_mode;		/* File mode */	__u16	i_uid;		/* Low 16 bits of Owner Uid */	__u32	i_size;		/* Size in bytes */	__u32	i_atime;	/* Access time */	__u32	i_ctime;	/* Creation time */	__u32	i_mtime;	/* Modification time */	__u32	i_dtime;	/* Deletion Time */	__u16	i_gid;		/* Low 16 bits of Group Id */	__u16	i_links_count;	/* Links count */	__u32	i_blocks;	/* Blocks count */	__u32	i_flags;	/* File flags */	union {		struct {			__u32  l_i_reserved1;		} linux1;		struct {			__u32  h_i_translator;		} hurd1;		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 */};/* * Permanent part of an large inode on the disk */struct ext2_inode_large {	__u16	i_mode;		/* File mode */	__u16	i_uid;		/* Low 16 bits of Owner Uid */	__u32	i_size;		/* Size in bytes */	__u32	i_atime;	/* Access time */	__u32	i_ctime;	/* Creation time */	__u32	i_mtime;	/* Modification time */	__u32	i_dtime;	/* Deletion Time */	__u16	i_gid;		/* Low 16 bits of Group Id */	__u16	i_links_count;	/* Links count */	__u32	i_blocks;	/* Blocks count */	__u32	i_flags;	/* File flags */	union {		struct {			__u32  l_i_reserved1;		} linux1;		struct {			__u32  h_i_translator;		} hurd1;