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source: bootcd/isolinux/syslinux-6.03/libinstaller/ext2fs/ext2_fs.h

Last change on this file was e16e8f2, checked in by Edwin Eefting <edwin@datux.nl>, 3 years ago
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Property mode set to `100644`
File size: 30.7 KB

Rev	Line
[e16e8f2]	1	/*
	2	* linux/include/linux/ext2_fs.h
	3	*
	4	* Copyright (C) 1992, 1993, 1994, 1995
	5	* Remy Card (card@masi.ibp.fr)
	6	* Laboratoire MASI - Institut Blaise Pascal
	7	* Universite Pierre et Marie Curie (Paris VI)
	8	*
	9	* from
	10	*
	11	* linux/include/linux/minix_fs.h
	12	*
	13	* Copyright (C) 1991, 1992 Linus Torvalds
	14	*/
	15
	16	#ifndef _EXT2FS_EXT2_FS_H
	17	#define _EXT2FS_EXT2_FS_H
	18
	19	#include <linux/types.h>
	20
	21	/*
	22	* The second extended filesystem constants/structures
	23	*/
	24
	25	/*
	26	* Define EXT2FS_DEBUG to produce debug messages
	27	*/
	28	#undef EXT2FS_DEBUG
	29
	30	/*
	31	* Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
	32	*/
	33	#define EXT2_PREALLOCATE
	34	#define EXT2_DEFAULT_PREALLOC_BLOCKS 8
	35
	36	/*
	37	* The second extended file system version
	38	*/
	39	#define EXT2FS_DATE "95/08/09"
	40	#define EXT2FS_VERSION "0.5b"
	41
	42	/*
	43	* Special inode numbers
	44	*/
	45	#define EXT2_BAD_INO 1 /* Bad blocks inode */
	46	#define EXT2_ROOT_INO 2 /* Root inode */
	47	#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
	48	#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
	49	#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
	50	#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
	51	#define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */
	52	#define EXT2_JOURNAL_INO 8 /* Journal inode */
	53	#define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */
	54	#define EXT4_REPLICA_INO 10 /* Used by non-upstream feature */
	55
	56	/* First non-reserved inode for old ext2 filesystems */
	57	#define EXT2_GOOD_OLD_FIRST_INO 11
	58
	59	/*
	60	* The second extended file system magic number
	61	*/
	62	#define EXT2_SUPER_MAGIC 0xEF53
	63
	64	#ifdef __KERNEL__
	65	#define EXT2_SB(sb) (&((sb)->u.ext2_sb))
	66	#else
	67	/* Assume that user mode programs are passing in an ext2fs superblock, not
	68	* a kernel struct super_block. This will allow us to call the feature-test
	69	* macros from user land. */
	70	#define EXT2_SB(sb) (sb)
	71	#endif
	72
	73	/*
	74	* Maximal count of links to a file
	75	*/
	76	#define EXT2_LINK_MAX 65000
	77
	78	/*
	79	* Macro-instructions used to manage several block sizes
	80	*/
	81	#define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */
	82	#define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */
	83	#define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE)
	84	#define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE)
	85	#ifdef __KERNEL__
	86	#define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
	87	#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
	88	#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits)
	89	#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
	90	#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
	91	#else
	92	#define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
	93	#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
	94	#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
	95	EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
	96	#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
	97	EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
	98	#endif
	99	#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
	100
	101	/*
	102	* Macro-instructions used to manage allocation clusters
	103	*/
	104	#define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
	105	#define EXT2_MAX_CLUSTER_LOG_SIZE 29 /* 512MB */
	106	#define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE
	107	#define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE)
	108	#define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \
	109	(s)->s_log_cluster_size)
	110	#define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10)
	111
	112	/*
	113	* Macro-instructions used to manage fragments
	114	*
	115	* Note: for backwards compatibility only, for the dump program.
	116	* Ext2/3/4 will never support fragments....
	117	*/
	118	#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE
	119	#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE
	120	#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
	121	#define EXT2_FRAG_SIZE(s) EXT2_BLOCK_SIZE(s)
	122	#define EXT2_FRAGS_PER_BLOCK(s) 1
	123
	124	/*
	125	* ACL structures
	126	*/
	127	struct ext2_acl_header /* Header of Access Control Lists */
	128	{
	129	__u32 aclh_size;
	130	__u32 aclh_file_count;
	131	__u32 aclh_acle_count;
	132	__u32 aclh_first_acle;
	133	};
	134
	135	struct ext2_acl_entry /* Access Control List Entry */
	136	{
	137	__u32 acle_size;
	138	__u16 acle_perms; /* Access permissions */
	139	__u16 acle_type; /* Type of entry */
	140	__u16 acle_tag; /* User or group identity */
	141	__u16 acle_pad1;
	142	__u32 acle_next; /* Pointer on next entry for the */
	143	/* same inode or on next free entry */
	144	};
	145
	146	/*
	147	* Structure of a blocks group descriptor
	148	*/
	149	struct ext2_group_desc
	150	{
	151	__u32 bg_block_bitmap; /* Blocks bitmap block */
	152	__u32 bg_inode_bitmap; /* Inodes bitmap block */
	153	__u32 bg_inode_table; /* Inodes table block */
	154	__u16 bg_free_blocks_count; /* Free blocks count */
	155	__u16 bg_free_inodes_count; /* Free inodes count */
	156	__u16 bg_used_dirs_count; /* Directories count */
	157	__u16 bg_flags;
	158	__u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
	159	__u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
	160	__u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
	161	__u16 bg_itable_unused; /* Unused inodes count */
	162	__u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/
	163	};
	164
	165	/*
	166	* Structure of a blocks group descriptor
	167	*/
	168	struct ext4_group_desc
	169	{
	170	__u32 bg_block_bitmap; /* Blocks bitmap block */
	171	__u32 bg_inode_bitmap; /* Inodes bitmap block */
	172	__u32 bg_inode_table; /* Inodes table block */
	173	__u16 bg_free_blocks_count; /* Free blocks count */
	174	__u16 bg_free_inodes_count; /* Free inodes count */
	175	__u16 bg_used_dirs_count; /* Directories count */
	176	__u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
	177	__u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
	178	__u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
	179	__u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
	180	__u16 bg_itable_unused; /* Unused inodes count */
	181	__u16 bg_checksum; /* crc16(sb_uuid+group+desc) */
	182	__u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
	183	__u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
	184	__u32 bg_inode_table_hi; /* Inodes table block MSB */
	185	__u16 bg_free_blocks_count_hi;/* Free blocks count MSB */
	186	__u16 bg_free_inodes_count_hi;/* Free inodes count MSB */
	187	__u16 bg_used_dirs_count_hi; /* Directories count MSB */
	188	__u16 bg_itable_unused_hi; /* Unused inodes count MSB */
	189	__u32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
	190	__u16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
	191	__u16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
	192	__u32 bg_reserved;
	193	};
	194
	195	#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */
	196	#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */
	197	#define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
	198
	199	/*
	200	* Data structures used by the directory indexing feature
	201	*
	202	* Note: all of the multibyte integer fields are little endian.
	203	*/
	204
	205	/*
	206	* Note: dx_root_info is laid out so that if it should somehow get
	207	* overlaid by a dirent the two low bits of the hash version will be
	208	* zero. Therefore, the hash version mod 4 should never be 0.
	209	* Sincerely, the paranoia department.
	210	*/
	211	struct ext2_dx_root_info {
	212	__u32 reserved_zero;
	213	__u8 hash_version; /* 0 now, 1 at release */
	214	__u8 info_length; /* 8 */
	215	__u8 indirect_levels;
	216	__u8 unused_flags;
	217	};
	218
	219	#define EXT2_HASH_LEGACY 0
	220	#define EXT2_HASH_HALF_MD4 1
	221	#define EXT2_HASH_TEA 2
	222	#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */
	223	#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */
	224	#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */
	225
	226	#define EXT2_HASH_FLAG_INCOMPAT 0x1
	227
	228	struct ext2_dx_entry {
	229	__u32 hash;
	230	__u32 block;
	231	};
	232
	233	struct ext2_dx_countlimit {
	234	__u16 limit;
	235	__u16 count;
	236	};
	237
	238
	239	/*
	240	* Macro-instructions used to manage group descriptors
	241	*/
	242	#define EXT2_MIN_DESC_SIZE 32
	243	#define EXT2_MIN_DESC_SIZE_64BIT 64
	244	#define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE
	245	#define EXT2_DESC_SIZE(s) \
	246	((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \
	247	(s)->s_desc_size : EXT2_MIN_DESC_SIZE)
	248
	249	#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
	250	#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
	251	#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group)
	252	#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
	253	/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
	254	#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \
	255	(EXT2_CLUSTER_SIZE(s) / \
	256	EXT2_BLOCK_SIZE(s)))
	257	#define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8)
	258	#define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \
	259	EXT2_INODES_PER_BLOCK(s))
	260	#ifdef __KERNEL__
	261	#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
	262	#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
	263	#else
	264	#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s))
	265	#endif
	266
	267	/*
	268	* Constants relative to the data blocks
	269	*/
	270	#define EXT2_NDIR_BLOCKS 12
	271	#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
	272	#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
	273	#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
	274	#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
	275
	276	/*
	277	* Inode flags
	278	*/
	279	#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
	280	#define EXT2_UNRM_FL 0x00000002 /* Undelete */
	281	#define EXT2_COMPR_FL 0x00000004 /* Compress file */
	282	#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
	283	#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
	284	#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
	285	#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
	286	#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
	287	/* Reserved for compression usage... */
	288	#define EXT2_DIRTY_FL 0x00000100
	289	#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
	290	#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */
	291	#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
	292	/* End compression flags --- maybe not all used */
	293	#define EXT2_BTREE_FL 0x00001000 /* btree format dir */
	294	#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */
	295	#define EXT2_IMAGIC_FL 0x00002000
	296	#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
	297	#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
	298	#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
	299	#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
	300	#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
	301	#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
	302	#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
	303	/* EXT4_EOFBLOCKS_FL 0x00400000 was here */
	304	#define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */
	305	#define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */
	306	#define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */
	307	#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
	308
	309	#define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
	310	#define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
	311
	312	/*
	313	* ioctl commands
	314	*/
	315
	316	/* Used for online resize */
	317	struct ext2_new_group_input {
	318	__u32 group; /* Group number for this data */
	319	__u32 block_bitmap; /* Absolute block number of block bitmap */
	320	__u32 inode_bitmap; /* Absolute block number of inode bitmap */
	321	__u32 inode_table; /* Absolute block number of inode table start */
	322	__u32 blocks_count; /* Total number of blocks in this group */
	323	__u16 reserved_blocks; /* Number of reserved blocks in this group */
	324	__u16 unused; /* Number of reserved GDT blocks in group */
	325	};
	326
	327	struct ext4_new_group_input {
	328	__u32 group; /* Group number for this data */
	329	__u64 block_bitmap; /* Absolute block number of block bitmap */
	330	__u64 inode_bitmap; /* Absolute block number of inode bitmap */
	331	__u64 inode_table; /* Absolute block number of inode table start */
	332	__u32 blocks_count; /* Total number of blocks in this group */
	333	__u16 reserved_blocks; /* Number of reserved blocks in this group */
	334	__u16 unused;
	335	};
	336
	337	#ifdef __GNU__ /* Needed for the Hurd */
	338	#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0)
	339	#endif
	340
	341	#define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
	342	#define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
	343	#define EXT2_IOC_GETVERSION _IOR('v', 1, long)
	344	#define EXT2_IOC_SETVERSION _IOW('v', 2, long)
	345	#define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long)
	346	#define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long)
	347	#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
	348	#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input)
	349	#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
	350	#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
	351
	352	/*
	353	* Structure of an inode on the disk
	354	*/
	355	struct ext2_inode {
	356	__u16 i_mode; /* File mode */
	357	__u16 i_uid; /* Low 16 bits of Owner Uid */
	358	__u32 i_size; /* Size in bytes */
	359	__u32 i_atime; /* Access time */
	360	__u32 i_ctime; /* Inode change time */
	361	__u32 i_mtime; /* Modification time */
	362	__u32 i_dtime; /* Deletion Time */
	363	__u16 i_gid; /* Low 16 bits of Group Id */
	364	__u16 i_links_count; /* Links count */
	365	__u32 i_blocks; /* Blocks count */
	366	__u32 i_flags; /* File flags */
	367	union {
	368	struct {
	369	__u32 l_i_version; /* was l_i_reserved1 */
	370	} linux1;
	371	struct {
	372	__u32 h_i_translator;
	373	} hurd1;
	374	} osd1; /* OS dependent 1 */
	375	__u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
	376	__u32 i_generation; /* File version (for NFS) */
	377	__u32 i_file_acl; /* File ACL */
	378	__u32 i_size_high; /* Formerly i_dir_acl, directory ACL */
	379	__u32 i_faddr; /* Fragment address */
	380	union {
	381	struct {
	382	__u16 l_i_blocks_hi;
	383	__u16 l_i_file_acl_high;
	384	__u16 l_i_uid_high; /* these 2 fields */
	385	__u16 l_i_gid_high; /* were reserved2[0] */
	386	__u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
	387	__u16 l_i_reserved;
	388	} linux2;
	389	struct {
	390	__u8 h_i_frag; /* Fragment number */
	391	__u8 h_i_fsize; /* Fragment size */
	392	__u16 h_i_mode_high;
	393	__u16 h_i_uid_high;
	394	__u16 h_i_gid_high;
	395	__u32 h_i_author;
	396	} hurd2;
	397	} osd2; /* OS dependent 2 */
	398	};
	399
	400	/*
	401	* Permanent part of an large inode on the disk
	402	*/
	403	struct ext2_inode_large {
	404	__u16 i_mode; /* File mode */
	405	__u16 i_uid; /* Low 16 bits of Owner Uid */
	406	__u32 i_size; /* Size in bytes */
	407	__u32 i_atime; /* Access time */
	408	__u32 i_ctime; /* Inode Change time */
	409	__u32 i_mtime; /* Modification time */
	410	__u32 i_dtime; /* Deletion Time */
	411	__u16 i_gid; /* Low 16 bits of Group Id */
	412	__u16 i_links_count; /* Links count */
	413	__u32 i_blocks; /* Blocks count */
	414	__u32 i_flags; /* File flags */
	415	union {
	416	struct {
	417	__u32 l_i_version; /* was l_i_reserved1 */
	418	} linux1;
	419	struct {
	420	__u32 h_i_translator;
	421	} hurd1;
	422	} osd1; /* OS dependent 1 */
	423	__u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
	424	__u32 i_generation; /* File version (for NFS) */
	425	__u32 i_file_acl; /* File ACL */
	426	__u32 i_size_high; /* Formerly i_dir_acl, directory ACL */
	427	__u32 i_faddr; /* Fragment address */
	428	union {
	429	struct {
	430	__u16 l_i_blocks_hi;
	431	__u16 l_i_file_acl_high;
	432	__u16 l_i_uid_high; /* these 2 fields */
	433	__u16 l_i_gid_high; /* were reserved2[0] */
	434	__u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
	435	__u16 l_i_reserved;
	436	} linux2;
	437	struct {
	438	__u8 h_i_frag; /* Fragment number */
	439	__u8 h_i_fsize; /* Fragment size */
	440	__u16 h_i_mode_high;
	441	__u16 h_i_uid_high;
	442	__u16 h_i_gid_high;
	443	__u32 h_i_author;
	444	} hurd2;
	445	} osd2; /* OS dependent 2 */
	446	__u16 i_extra_isize;
	447	__u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */
	448	__u32 i_ctime_extra; /* extra Change time (nsec << 2 \| epoch) */
	449	__u32 i_mtime_extra; /* extra Modification time (nsec << 2 \| epoch) */
	450	__u32 i_atime_extra; /* extra Access time (nsec << 2 \| epoch) */
	451	__u32 i_crtime; /* File creation time */
	452	__u32 i_crtime_extra; /* extra File creation time (nsec << 2 \| epoch)*/
	453	__u32 i_version_hi; /* high 32 bits for 64-bit version */
	454	};
	455
	456	#define i_dir_acl i_size_high
	457
	458	#if defined(__KERNEL__) \|\| defined(__linux__)
	459	#define i_reserved1 osd1.linux1.l_i_reserved1
	460	#define i_frag osd2.linux2.l_i_frag
	461	#define i_fsize osd2.linux2.l_i_fsize
	462	#define i_uid_low i_uid
	463	#define i_gid_low i_gid
	464	#define i_uid_high osd2.linux2.l_i_uid_high
	465	#define i_gid_high osd2.linux2.l_i_gid_high
	466	#else
	467	#if defined(__GNU__)
	468
	469	#define i_translator osd1.hurd1.h_i_translator
	470	#define i_frag osd2.hurd2.h_i_frag;
	471	#define i_fsize osd2.hurd2.h_i_fsize;
	472	#define i_uid_high osd2.hurd2.h_i_uid_high
	473	#define i_gid_high osd2.hurd2.h_i_gid_high
	474	#define i_author osd2.hurd2.h_i_author
	475
	476	#endif /* __GNU__ */
	477	#endif /* defined(__KERNEL__) \|\| defined(__linux__) */
	478
	479	#define inode_uid(inode) ((inode).i_uid \| (inode).osd2.linux2.l_i_uid_high << 16)
	480	#define inode_gid(inode) ((inode).i_gid \| (inode).osd2.linux2.l_i_gid_high << 16)
	481	#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x))
	482	#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x))
	483
	484	/*
	485	* File system states
	486	*/
	487	#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
	488	#define EXT2_ERROR_FS 0x0002 /* Errors detected */
	489	#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
	490
	491	/*
	492	* Misc. filesystem flags
	493	*/
	494	#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
	495	#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
	496	#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */
	497	#define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */
	498	#define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */
	499	#define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */
	500
	501	/*
	502	* Mount flags
	503	*/
	504	#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */
	505	#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
	506	#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
	507	#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
	508	#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
	509	#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
	510	#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
	511	#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */
	512
	513	#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
	514	#define set_opt(o, opt) o \|= EXT2_MOUNT_##opt
	515	#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
	516	EXT2_MOUNT_##opt)
	517	/*
	518	* Maximal mount counts between two filesystem checks
	519	*/
	520	#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
	521	#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
	522
	523	/*
	524	* Behaviour when detecting errors
	525	*/
	526	#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
	527	#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
	528	#define EXT2_ERRORS_PANIC 3 /* Panic */
	529	#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
	530
	531	#if (__GNUC__ >= 4)
	532	#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER)
	533	#else
	534	#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
	535	#endif
	536
	537	/*
	538	* Structure of the super block
	539	*/
	540	struct ext2_super_block {
	541	__u32 s_inodes_count; /* Inodes count */
	542	__u32 s_blocks_count; /* Blocks count */
	543	__u32 s_r_blocks_count; /* Reserved blocks count */
	544	__u32 s_free_blocks_count; /* Free blocks count */
	545	__u32 s_free_inodes_count; /* Free inodes count */
	546	__u32 s_first_data_block; /* First Data Block */
	547	__u32 s_log_block_size; /* Block size */
	548	__u32 s_log_cluster_size; /* Allocation cluster size */
	549	__u32 s_blocks_per_group; /* # Blocks per group */
	550	__u32 s_clusters_per_group; /* # Fragments per group */
	551	__u32 s_inodes_per_group; /* # Inodes per group */
	552	__u32 s_mtime; /* Mount time */
	553	__u32 s_wtime; /* Write time */
	554	__u16 s_mnt_count; /* Mount count */
	555	__s16 s_max_mnt_count; /* Maximal mount count */
	556	__u16 s_magic; /* Magic signature */
	557	__u16 s_state; /* File system state */
	558	__u16 s_errors; /* Behaviour when detecting errors */
	559	__u16 s_minor_rev_level; /* minor revision level */
	560	__u32 s_lastcheck; /* time of last check */
	561	__u32 s_checkinterval; /* max. time between checks */
	562	__u32 s_creator_os; /* OS */
	563	__u32 s_rev_level; /* Revision level */
	564	__u16 s_def_resuid; /* Default uid for reserved blocks */
	565	__u16 s_def_resgid; /* Default gid for reserved blocks */
	566	/*
	567	* These fields are for EXT2_DYNAMIC_REV superblocks only.
	568	*
	569	* Note: the difference between the compatible feature set and
	570	* the incompatible feature set is that if there is a bit set
	571	* in the incompatible feature set that the kernel doesn't
	572	* know about, it should refuse to mount the filesystem.
	573	*
	574	* e2fsck's requirements are more strict; if it doesn't know
	575	* about a feature in either the compatible or incompatible
	576	* feature set, it must abort and not try to meddle with
	577	* things it doesn't understand...
	578	*/
	579	__u32 s_first_ino; /* First non-reserved inode */
	580	__u16 s_inode_size; /* size of inode structure */
	581	__u16 s_block_group_nr; /* block group # of this superblock */
	582	__u32 s_feature_compat; /* compatible feature set */
	583	__u32 s_feature_incompat; /* incompatible feature set */
	584	__u32 s_feature_ro_compat; /* readonly-compatible feature set */
	585	__u8 s_uuid[16]; /* 128-bit uuid for volume */
	586	char s_volume_name[16]; /* volume name */
	587	char s_last_mounted[64]; /* directory where last mounted */
	588	__u32 s_algorithm_usage_bitmap; /* For compression */
	589	/*
	590	* Performance hints. Directory preallocation should only
	591	* happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
	592	*/
	593	__u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
	594	__u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
	595	__u16 s_reserved_gdt_blocks; /* Per group table for online growth */
	596	/*
	597	* Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
	598	*/
	599	__u8 s_journal_uuid[16]; /* uuid of journal superblock */
	600	__u32 s_journal_inum; /* inode number of journal file */
	601	__u32 s_journal_dev; /* device number of journal file */
	602	__u32 s_last_orphan; /* start of list of inodes to delete */
	603	__u32 s_hash_seed[4]; /* HTREE hash seed */
	604	__u8 s_def_hash_version; /* Default hash version to use */
	605	__u8 s_jnl_backup_type; /* Default type of journal backup */
	606	__u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */
	607	__u32 s_default_mount_opts;
	608	__u32 s_first_meta_bg; /* First metablock group */
	609	__u32 s_mkfs_time; /* When the filesystem was created */
	610	__u32 s_jnl_blocks[17]; /* Backup of the journal inode */
	611	__u32 s_blocks_count_hi; /* Blocks count high 32bits */
	612	__u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/
	613	__u32 s_free_blocks_hi; /* Free blocks count */
	614	__u16 s_min_extra_isize; /* All inodes have at least # bytes */
	615	__u16 s_want_extra_isize; /* New inodes should reserve # bytes */
	616	__u32 s_flags; /* Miscellaneous flags */
	617	__u16 s_raid_stride; /* RAID stride */
	618	__u16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
	619	__u64 s_mmp_block; /* Block for multi-mount protection */
	620	__u32 s_raid_stripe_width; /* blocks on all data disks (Nstride)/
	621	__u8 s_log_groups_per_flex; /* FLEX_BG group size */
	622	__u8 s_reserved_char_pad;
	623	__u16 s_reserved_pad; /* Padding to next 32bits */
	624	__u64 s_kbytes_written; /* nr of lifetime kilobytes written */
	625	__u32 s_snapshot_inum; /* Inode number of active snapshot */
	626	__u32 s_snapshot_id; /* sequential ID of active snapshot */
	627	__u64 s_snapshot_r_blocks_count; /* reserved blocks for active
	628	snapshot's future use */
	629	__u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */
	630	#define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count)
	631	__u32 s_error_count; /* number of fs errors */
	632	__u32 s_first_error_time; /* first time an error happened */
	633	__u32 s_first_error_ino; /* inode involved in first error */
	634	__u64 s_first_error_block; /* block involved of first error */
	635	__u8 s_first_error_func[32]; /* function where the error happened */
	636	__u32 s_first_error_line; /* line number where error happened */
	637	__u32 s_last_error_time; /* most recent time of an error */
	638	__u32 s_last_error_ino; /* inode involved in last error */
	639	__u32 s_last_error_line; /* line number where error happened */
	640	__u64 s_last_error_block; /* block involved of last error */
	641	__u8 s_last_error_func[32]; /* function where the error happened */
	642	#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts)
	643	__u8 s_mount_opts[64];
	644	__u32 s_usr_quota_inum; /* inode number of user quota file */
	645	__u32 s_grp_quota_inum; /* inode number of group quota file */
	646	__u32 s_overhead_blocks; /* overhead blocks/clusters in fs */
	647	__u32 s_reserved[108]; /* Padding to the end of the block */
	648	__u32 s_checksum; /* crc32c(superblock) */
	649	};
	650
	651	#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
	652
	653	/*
	654	* Codes for operating systems
	655	*/
	656	#define EXT2_OS_LINUX 0
	657	#define EXT2_OS_HURD 1
	658	#define EXT2_OBSO_OS_MASIX 2
	659	#define EXT2_OS_FREEBSD 3
	660	#define EXT2_OS_LITES 4
	661
	662	/*
	663	* Revision levels
	664	*/
	665	#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
	666	#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
	667
	668	#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
	669	#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
	670
	671	#define EXT2_GOOD_OLD_INODE_SIZE 128
	672
	673	/*
	674	* Journal inode backup types
	675	*/
	676	#define EXT3_JNL_BACKUP_BLOCKS 1
	677
	678	/*
	679	* Feature set definitions
	680	*/
	681
	682	#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
	683	( EXT2_SB(sb)->s_feature_compat & (mask) )
	684	#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
	685	( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
	686	#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
	687	( EXT2_SB(sb)->s_feature_incompat & (mask) )
	688
	689	#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
	690	#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
	691	#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
	692	#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
	693	#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
	694	#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
	695	#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040
	696	/* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */
	697	#define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100
	698
	699
	700	#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
	701	#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
	702	/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */
	703	#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
	704	#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
	705	#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
	706	#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
	707	#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080
	708	#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
	709	#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
	710	#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
	711	#define EXT4_FEATURE_RO_COMPAT_REPLICA 0x0800
	712
	713	#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
	714	#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
	715	#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
	716	#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
	717	#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
	718	#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040
	719	#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
	720	#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
	721	#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
	722	#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
	723	#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
	724
	725	#define EXT2_FEATURE_COMPAT_SUPP 0
	726	#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE\| \
	727	EXT4_FEATURE_INCOMPAT_MMP)
	728	#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER\| \
	729	EXT2_FEATURE_RO_COMPAT_LARGE_FILE\| \
	730	EXT4_FEATURE_RO_COMPAT_DIR_NLINK\| \
	731	EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
	732
	733	/*
	734	* Default values for user and/or group using reserved blocks
	735	*/
	736	#define EXT2_DEF_RESUID 0
	737	#define EXT2_DEF_RESGID 0
	738
	739	/*
	740	* Default mount options
	741	*/
	742	#define EXT2_DEFM_DEBUG 0x0001
	743	#define EXT2_DEFM_BSDGROUPS 0x0002
	744	#define EXT2_DEFM_XATTR_USER 0x0004
	745	#define EXT2_DEFM_ACL 0x0008
	746	#define EXT2_DEFM_UID16 0x0010
	747	#define EXT3_DEFM_JMODE 0x0060
	748	#define EXT3_DEFM_JMODE_DATA 0x0020
	749	#define EXT3_DEFM_JMODE_ORDERED 0x0040
	750	#define EXT3_DEFM_JMODE_WBACK 0x0060
	751	#define EXT4_DEFM_NOBARRIER 0x0100
	752	#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
	753	#define EXT4_DEFM_DISCARD 0x0400
	754	#define EXT4_DEFM_NODELALLOC 0x0800
	755
	756	/*
	757	* Structure of a directory entry
	758	*/
	759	#define EXT2_NAME_LEN 255
	760
	761	struct ext2_dir_entry {
	762	__u32 inode; /* Inode number */
	763	__u16 rec_len; /* Directory entry length */
	764	__u16 name_len; /* Name length */
	765	char name[EXT2_NAME_LEN]; /* File name */
	766	};
	767
	768	/*
	769	* The new version of the directory entry. Since EXT2 structures are
	770	* stored in intel byte order, and the name_len field could never be
	771	* bigger than 255 chars, it's safe to reclaim the extra byte for the
	772	* file_type field.
	773	*/
	774	struct ext2_dir_entry_2 {
	775	__u32 inode; /* Inode number */
	776	__u16 rec_len; /* Directory entry length */
	777	__u8 name_len; /* Name length */
	778	__u8 file_type;
	779	char name[EXT2_NAME_LEN]; /* File name */
	780	};
	781
	782	/*
	783	* Ext2 directory file types. Only the low 3 bits are used. The
	784	* other bits are reserved for now.
	785	*/
	786	#define EXT2_FT_UNKNOWN 0
	787	#define EXT2_FT_REG_FILE 1
	788	#define EXT2_FT_DIR 2
	789	#define EXT2_FT_CHRDEV 3
	790	#define EXT2_FT_BLKDEV 4
	791	#define EXT2_FT_FIFO 5
	792	#define EXT2_FT_SOCK 6
	793	#define EXT2_FT_SYMLINK 7
	794
	795	#define EXT2_FT_MAX 8
	796
	797	/*
	798	* EXT2_DIR_PAD defines the directory entries boundaries
	799	*
	800	* NOTE: It must be a multiple of 4
	801	*/
	802	#define EXT2_DIR_PAD 4
	803	#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
	804	#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
	805	~EXT2_DIR_ROUND)
	806
	807	/*
	808	* This structure is used for multiple mount protection. It is written
	809	* into the block number saved in the s_mmp_block field in the superblock.
	810	* Programs that check MMP should assume that if SEQ_FSCK (or any unknown
	811	* code above SEQ_MAX) is present then it is NOT safe to use the filesystem,
	812	* regardless of how old the timestamp is.
	813	*
	814	* The timestamp in the MMP structure will be updated by e2fsck at some
	815	* arbitary intervals (start of passes, after every few groups of inodes
	816	* in pass1 and pass1b). There is no guarantee that e2fsck is updating
	817	* the MMP block in a timely manner, and the updates it does are purely
	818	* for the convenience of the sysadmin and not for automatic validation.
	819	*
	820	* Note: Only the mmp_seq value is used to determine whether the MMP block
	821	* is being updated. The mmp_time, mmp_nodename, and mmp_bdevname
	822	* fields are only for informational purposes for the administrator,
	823	* due to clock skew between nodes and hostname HA service takeover.
	824	*/
	825	#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
	826	#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
	827	#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
	828	#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
	829
	830	struct mmp_struct {
	831	__u32 mmp_magic; /* Magic number for MMP */
	832	__u32 mmp_seq; /* Sequence no. updated periodically */
	833	__u64 mmp_time; /* Time last updated */
	834	char mmp_nodename[64]; /* Node which last updated MMP block */
	835	char mmp_bdevname[32]; /* Bdev which last updated MMP block */
	836	__u16 mmp_check_interval; /* Changed mmp_check_interval */
	837	__u16 mmp_pad1;
	838	__u32 mmp_pad2[227];
	839	};
	840
	841	/*
	842	* Default interval for MMP update in seconds.
	843	*/
	844	#define EXT4_MMP_UPDATE_INTERVAL 5
	845
	846	/*
	847	* Maximum interval for MMP update in seconds.
	848	*/
	849	#define EXT4_MMP_MAX_UPDATE_INTERVAL 300
	850
	851	/*
	852	* Minimum interval for MMP checking in seconds.
	853	*/
	854	#define EXT4_MMP_MIN_CHECK_INTERVAL 5
	855
	856	#endif /* _EXT2FS_EXT2_FS_H */

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