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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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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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