/* *  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 <linux/types.h> /* * The second extended filesystem constants/structures */ /* * Define EXT2FS_DEBUG to produce debug messages */#undef EXT2FS_DEBUG /* * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files */#define EXT2_PREALLOCATE#define EXT2_DEFAULT_PREALLOC_BLOCKS	8 /* * The second extended file system version */#define EXT2FS_DATE		"95/08/09"#define EXT2FS_VERSION		"0.5b" /* * Debug code */#ifdef EXT2FS_DEBUG#	define ext2_debug(f, a...)	{ \					printk ("EXT2-fs DEBUG (%s, %d): %s:", \						__FILE__, __LINE__, __FUNCTION__); \				  	printk (f, ## a); \					}#else#	define ext2_debug(f, a...)	/**/#endif /* * Special inode numbers */#define	EXT2_BAD_INO		 1	/* Bad blocks inode */#define EXT2_ROOT_INO		 2	/* Root inode */#define EXT2_BOOT_LOADER_INO	 5	/* Boot loader inode */#define EXT2_UNDEL_DIR_INO	 6	/* Undelete directory 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 #ifdef __KERNEL__#include <linux/ext2_fs_sb.h>static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb){	return sb->s_fs_info;}#else/* 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)#endif /* * Maximal count of links to a file */#define EXT2_LINK_MAX		32000 /* * Macro-instructions used to manage several block sizes */#define EXT2_MIN_BLOCK_SIZE		1024#define	EXT2_MAX_BLOCK_SIZE		4096#define EXT2_MIN_BLOCK_LOG_SIZE		  10#ifdef __KERNEL__# define EXT2_BLOCK_SIZE(s)		((s)->s_blocksize)#else# define EXT2_BLOCK_SIZE(s)		(EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)#endif#define	EXT2_ADDR_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (__u32))#ifdef __KERNEL__# define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)#else# define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)#endif#ifdef __KERNEL__#define	EXT2_ADDR_PER_BLOCK_BITS(s)	(EXT2_SB(s)->s_addr_per_block_bits)#define EXT2_INODE_SIZE(s)		(EXT2_SB(s)->s_inode_size)#define EXT2_FIRST_INO(s)		(EXT2_SB(s)->s_first_ino)#else#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)#endif /* * Macro-instructions used to manage fragments */#define EXT2_MIN_FRAG_SIZE		1024#define	EXT2_MAX_FRAG_SIZE		4096#define EXT2_MIN_FRAG_LOG_SIZE		  10#ifdef __KERNEL__# define EXT2_FRAG_SIZE(s)		(EXT2_SB(s)->s_frag_size)# define EXT2_FRAGS_PER_BLOCK(s)	(EXT2_SB(s)->s_frags_per_block)#else# 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))#endif /* * Structure of a blocks group descriptor */struct ext2_group_desc{	__le32	bg_block_bitmap;		/* Blocks bitmap block */	__le32	bg_inode_bitmap;		/* Inodes bitmap block */	__le32	bg_inode_table;		/* Inodes table block */	__le16	bg_free_blocks_count;	/* Free blocks count */	__le16	bg_free_inodes_count;	/* Free inodes count */	__le16	bg_used_dirs_count;	/* Directories count */	__le16	bg_pad;	__le32	bg_reserved[3];}; /* * Macro-instructions used to manage group descriptors */#ifdef __KERNEL__# define EXT2_BLOCKS_PER_GROUP(s)	(EXT2_SB(s)->s_blocks_per_group)# define EXT2_DESC_PER_BLOCK(s)		(EXT2_SB(s)->s_desc_per_block)# define EXT2_INODES_PER_GROUP(s)	(EXT2_SB(s)->s_inodes_per_group)# define EXT2_DESC_PER_BLOCK_BITS(s)	(EXT2_SB(s)->s_desc_per_block_bits)#else# define EXT2_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)# define EXT2_DESC_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))# define EXT2_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)#endif /* * 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_NOCOMP_FL			0x00000400 /* Don't compress */#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 /* AFS directory */#define EXT2_JOURNAL_DATA_FL		0x00004000 /* Reserved for ext3 */#define EXT2_NOTAIL_FL			0x00008000 /* file tail should not be merged */#define EXT2_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */#define EXT2_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/#define EXT2_RESERVED_FL		0x80000000 /* reserved for ext2 lib */ #define EXT2_FL_USER_VISIBLE		0x0003DFFF /* User visible flags */#define EXT2_FL_USER_MODIFIABLE		0x000380FF /* 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 {	__le16	i_mode;		/* File mode */	__le16	i_uid;		/* Low 16 bits of Owner Uid */	__le32	i_size;		/* Size in bytes */	__le32	i_atime;	/* Access time */	__le32	i_ctime;	/* Creation time */	__le32	i_mtime;	/* Modification time */	__le32	i_dtime;	/* Deletion Time */	__le16	i_gid;		/* Low 16 bits of Group Id */	__le16	i_links_count;	/* Links count */	__le32	i_blocks;	/* Blocks count */	__le32	i_flags;	/* File flags */	union {		struct {			__le32  l_i_reserved1;		} linux1;		struct {			__le32  h_i_translator;		} hurd1;		struct {			__le32  m_i_reserved1;		} masix1;	} osd1;				/* OS dependent 1 */	__le32	i_block[EXT2_N_BLOCKS];/* Pointers to blocks */	__le32	i_generation;	/* File version (for NFS) */	__le32	i_file_acl;	/* File ACL */	__le32	i_dir_acl;	/* Directory ACL */	__le32	i_faddr;	/* Fragment address */	union {		struct {			__u8	l_i_frag;	/* Fragment number */			__u8	l_i_fsize;	/* Fragment size */			__u16	i_pad1;			__le16	l_i_uid_high;	/* these 2 fields    */			__le16	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 */			__le16	h_i_mode_high;			__le16	h_i_uid_high;			__le16	h_i_gid_high;			__le32	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 */}; #define i_size_high	i_dir_acl #if defined(__KERNEL__) || defined(__linux__)#define i_reserved1	osd1.linux1.l_i_reserved1#define i_frag		osd2.linux2.l_i_frag#define i_fsize		osd2.linux2.l_i_fsize#define i_uid_low	i_uid#define i_gid_low	i_gid#define i_uid_high	osd2.linux2.l_i_uid_high#define i_gid_high	osd2.linux2.l_i_gid_high#define i_reserved2	osd2.linux2.l_i_reserved2#endif #ifdef	__hurd__#define i_translator	osd1.hurd1.h_i_translator#define i_frag		osd2.hurd2.h_i_frag;#define i_fsize		osd2.hurd2.h_i_fsize;#define i_uid_high	osd2.hurd2.h_i_uid_high#define i_gid_high	osd2.hurd2.h_i_gid_high#define i_author	osd2.hurd2.h_i_author#endif #ifdef	__masix__#define i_reserved1	osd1.masix1.m_i_reserved1#define i_frag		osd2.masix2.m_i_frag#define i_fsize		osd2.masix2.m_i_fsize#define i_reserved2	osd2.masix2.m_i_reserved2#endif /* * File system states */#define	EXT2_VALID_FS			0x0001	/* Unmounted cleanly */#define	EXT2_ERROR_FS			0x0002	/* Errors detected */ /* * Mount flags */#define EXT2_MOUNT_CHECK		0x000001  /* Do mount-time checks */#define EXT2_MOUNT_OLDALLOC		0x000002  /* Don't use the new Orlov allocator */#define EXT2_MOUNT_GRPID		0x000004  /* Create files with directory's group */#define EXT2_MOUNT_DEBUG		0x000008  /* Some debugging messages */#define EXT2_MOUNT_ERRORS_CONT		0x000010  /* Continue on errors */#define EXT2_MOUNT_ERRORS_RO		0x000020  /* Remount fs ro on errors */#define EXT2_MOUNT_ERRORS_PANIC		0x000040  /* Panic on errors */#define EXT2_MOUNT_MINIX_DF		0x000080  /* Mimics the Minix statfs */#define EXT2_MOUNT_NOBH			0x000100  /* No buffer_heads */#define EXT2_MOUNT_NO_UID32		0x000200  /* Disable 32-bit UIDs */#define EXT2_MOUNT_XATTR_USER		0x004000  /* Extended user attributes */#define EXT2_MOUNT_POSIX_ACL		0x008000  /* POSIX Access Control Lists */#define EXT2_MOUNT_XIP			0x010000  /* Execute in place */#define EXT2_MOUNT_USRQUOTA		0x020000 /* user quota */#define EXT2_MOUNT_GRPQUOTA		0x040000 /* group quota */  #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 {	__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 */}; /* * 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 /* * Feature set definitions */ #define EXT2_HAS_COMPAT_FEATURE(sb,mask)			\	( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)			\	( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)			\	( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )#define EXT2_SET_COMPAT_FEATURE(sb,mask)			\	EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask)			\	EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)#define EXT2_SET_INCOMPAT_FEATURE(sb,mask)			\	EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask)			\	EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask)			\	EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask)			\	EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(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_COMPAT_ANY			0xffffffff #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE	0x0002#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR	0x0004#define EXT2_FEATURE_RO_COMPAT_ANY		0xffffffff #define EXT2_FEATURE_INCOMPAT_COMPRESSION	0x0001#define EXT2_FEATURE_INCOMPAT_FILETYPE		0x0002#define EXT3_FEATURE_INCOMPAT_RECOVER		0x0004#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008#define EXT2_FEATURE_INCOMPAT_META_BG		0x0010#define EXT2_FEATURE_INCOMPAT_ANY		0xffffffff #define EXT2_FEATURE_COMPAT_SUPP	EXT2_FEATURE_COMPAT_EXT_ATTR#define EXT2_FEATURE_INCOMPAT_SUPP	(EXT2_FEATURE_INCOMPAT_FILETYPE| \					 EXT2_FEATURE_INCOMPAT_META_BG)#define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \					 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED	~EXT2_FEATURE_RO_COMPAT_SUPP#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED	~EXT2_FEATURE_INCOMPAT_SUPP /* * 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    /* Not used by ext2, but reserved for use by ext3 */#define EXT3_DEFM_JMODE		0x0060 

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