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ext3_fs.h @ 46

Last change on this file since 46 was 46, checked in by megakiss, 11 years ago
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1	/*
2	* linux/include/linux/ext3_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 _LINUX_EXT3_FS_H
17	#define _LINUX_EXT3_FS_H
18
19	#include <linux/types.h>
20
21	struct statfs;
22
23	/*
24	* The second extended filesystem constants/structures
25	*/
26
27	/*
28	* Define EXT3FS_DEBUG to produce debug messages
29	*/
30	#undef EXT3FS_DEBUG
31
32	/*
33	* Define EXT3_RESERVATION to reserve data blocks for expanding files
34	*/
35	#define EXT3_DEFAULT_RESERVE_BLOCKS 8
36	#define EXT3_MAX_RESERVE_BLOCKS 1024
37	#define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
38	/*
39	* Always enable hashed directories
40	*/
41	#define CONFIG_EXT3_INDEX
42
43	/*
44	* Debug code
45	*/
46	#ifdef EXT3FS_DEBUG
47	#define ext3_debug(f, a...) \
48	do { \
49	printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:", \
50	__FILE__, __LINE__, __FUNCTION__); \
51	printk (KERN_DEBUG f, ## a); \
52	} while (0)
53	#else
54	#define ext3_debug(f, a...) do {} while (0)
55	#endif
56
57	/*
58	* Special inodes numbers
59	*/
60	#define EXT3_BAD_INO 1 /* Bad blocks inode */
61	#define EXT3_ROOT_INO 2 /* Root inode */
62	#define EXT3_BOOT_LOADER_INO 5 /* Boot loader inode */
63	#define EXT3_UNDEL_DIR_INO 6 /* Undelete directory inode */
64	#define EXT3_RESIZE_INO 7 /* Reserved group descriptors inode */
65	#define EXT3_JOURNAL_INO 8 /* Journal inode */
66
67	/* First non-reserved inode for old ext3 filesystems */
68	#define EXT3_GOOD_OLD_FIRST_INO 11
69
70	/*
71	* The second extended file system magic number
72	*/
73	#define EXT3_SUPER_MAGIC 0xEF53
74
75	/*
76	* Maximal count of links to a file
77	*/
78	#define EXT3_LINK_MAX 32000
79
80	/*
81	* Macro-instructions used to manage several block sizes
82	*/
83	#define EXT3_MIN_BLOCK_SIZE 1024
84	#define EXT3_MAX_BLOCK_SIZE 4096
85	#define EXT3_MIN_BLOCK_LOG_SIZE 10
86	# define EXT3_BLOCK_SIZE(s) (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
87	#define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
88	# define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
89	#define EXT3_INODE_SIZE(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
90	EXT3_GOOD_OLD_INODE_SIZE : \
91	(s)->s_inode_size)
92	#define EXT3_FIRST_INO(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
93	EXT3_GOOD_OLD_FIRST_INO : \
94	(s)->s_first_ino)
95
96	/*
97	* Macro-instructions used to manage fragments
98	*/
99	#define EXT3_MIN_FRAG_SIZE 1024
100	#define EXT3_MAX_FRAG_SIZE 4096
101	#define EXT3_MIN_FRAG_LOG_SIZE 10
102	# define EXT3_FRAG_SIZE(s) (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
103	# define EXT3_FRAGS_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
104
105	/*
106	* Structure of a blocks group descriptor
107	*/
108	struct ext3_group_desc
109	{
110	__le32 bg_block_bitmap; /* Blocks bitmap block */
111	__le32 bg_inode_bitmap; /* Inodes bitmap block */
112	__le32 bg_inode_table; /* Inodes table block */
113	__le16 bg_free_blocks_count; /* Free blocks count */
114	__le16 bg_free_inodes_count; /* Free inodes count */
115	__le16 bg_used_dirs_count; /* Directories count */
116	__u16 bg_pad;
117	__le32 bg_reserved[3];
118	};
119
120	/*
121	* Macro-instructions used to manage group descriptors
122	*/
123	# define EXT3_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
124	# define EXT3_DESC_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
125	# define EXT3_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
126
127	/*
128	* Constants relative to the data blocks
129	*/
130	#define EXT3_NDIR_BLOCKS 12
131	#define EXT3_IND_BLOCK EXT3_NDIR_BLOCKS
132	#define EXT3_DIND_BLOCK (EXT3_IND_BLOCK + 1)
133	#define EXT3_TIND_BLOCK (EXT3_DIND_BLOCK + 1)
134	#define EXT3_N_BLOCKS (EXT3_TIND_BLOCK + 1)
135
136	/*
137	* Inode flags
138	*/
139	#define EXT3_SECRM_FL 0x00000001 /* Secure deletion */
140	#define EXT3_UNRM_FL 0x00000002 /* Undelete */
141	#define EXT3_COMPR_FL 0x00000004 /* Compress file */
142	#define EXT3_SYNC_FL 0x00000008 /* Synchronous updates */
143	#define EXT3_IMMUTABLE_FL 0x00000010 /* Immutable file */
144	#define EXT3_APPEND_FL 0x00000020 /* writes to file may only append */
145	#define EXT3_NODUMP_FL 0x00000040 /* do not dump file */
146	#define EXT3_NOATIME_FL 0x00000080 /* do not update atime */
147	/* Reserved for compression usage... */
148	#define EXT3_DIRTY_FL 0x00000100
149	#define EXT3_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
150	#define EXT3_NOCOMPR_FL 0x00000400 /* Don't compress */
151	#define EXT3_ECOMPR_FL 0x00000800 /* Compression error */
152	/* End compression flags --- maybe not all used */
153	#define EXT3_INDEX_FL 0x00001000 /* hash-indexed directory */
154	#define EXT3_IMAGIC_FL 0x00002000 /* AFS directory */
155	#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
156	#define EXT3_NOTAIL_FL 0x00008000 /* file tail should not be merged */
157	#define EXT3_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
158	#define EXT3_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
159	#define EXT3_RESERVED_FL 0x80000000 /* reserved for ext3 lib */
160
161	#define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
162	#define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
163
164	/*
165	* Inode dynamic state flags
166	*/
167	#define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */
168	#define EXT3_STATE_NEW 0x00000002 /* inode is newly created */
169	#define EXT3_STATE_XATTR 0x00000004 /* has in-inode xattrs */
170
171	/* Used to pass group descriptor data when online resize is done */
172	struct ext3_new_group_input {
173	__u32 group; /* Group number for this data */
174	__u32 block_bitmap; /* Absolute block number of block bitmap */
175	__u32 inode_bitmap; /* Absolute block number of inode bitmap */
176	__u32 inode_table; /* Absolute block number of inode table start */
177	__u32 blocks_count; /* Total number of blocks in this group */
178	__u16 reserved_blocks; /* Number of reserved blocks in this group */
179	__u16 unused;
180	};
181
182	/* The struct ext3_new_group_input in kernel space, with free_blocks_count */
183	struct ext3_new_group_data {
184	__u32 group;
185	__u32 block_bitmap;
186	__u32 inode_bitmap;
187	__u32 inode_table;
188	__u32 blocks_count;
189	__u16 reserved_blocks;
190	__u16 unused;
191	__u32 free_blocks_count;
192	};
193
194
195	/*
196	* ioctl commands
197	*/
198	#define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
199	#define EXT3_IOC_SETFLAGS _IOW('f', 2, long)
200	#define EXT3_IOC_GETVERSION _IOR('f', 3, long)
201	#define EXT3_IOC_SETVERSION _IOW('f', 4, long)
202	#define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
203	#define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input)
204	#define EXT3_IOC_GETVERSION_OLD _IOR('v', 1, long)
205	#define EXT3_IOC_SETVERSION_OLD _IOW('v', 2, long)
206	#ifdef CONFIG_JBD_DEBUG
207	#define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
208	#endif
209	#define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
210	#define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
211
212	/*
213	* Structure of an inode on the disk
214	*/
215	struct ext3_inode {
216	__le16 i_mode; /* File mode */
217	__le16 i_uid; /* Low 16 bits of Owner Uid */
218	__le32 i_size; /* Size in bytes */
219	__le32 i_atime; /* Access time */
220	__le32 i_ctime; /* Creation time */
221	__le32 i_mtime; /* Modification time */
222	__le32 i_dtime; /* Deletion Time */
223	__le16 i_gid; /* Low 16 bits of Group Id */
224	__le16 i_links_count; /* Links count */
225	__le32 i_blocks; /* Blocks count */
226	__le32 i_flags; /* File flags */
227	union {
228	struct {
229	__u32 l_i_reserved1;
230	} linux1;
231	struct {
232	__u32 h_i_translator;
233	} hurd1;
234	struct {
235	__u32 m_i_reserved1;
236	} masix1;
237	} osd1; /* OS dependent 1 */
238	__le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
239	__le32 i_generation; /* File version (for NFS) */
240	__le32 i_file_acl; /* File ACL */
241	__le32 i_dir_acl; /* Directory ACL */
242	__le32 i_faddr; /* Fragment address */
243	union {
244	struct {
245	__u8 l_i_frag; /* Fragment number */
246	__u8 l_i_fsize; /* Fragment size */
247	__u16 i_pad1;
248	__le16 l_i_uid_high; /* these 2 fields */
249	__le16 l_i_gid_high; /* were reserved2[0] */
250	__u32 l_i_reserved2;
251	} linux2;
252	struct {
253	__u8 h_i_frag; /* Fragment number */
254	__u8 h_i_fsize; /* Fragment size */
255	__u16 h_i_mode_high;
256	__u16 h_i_uid_high;
257	__u16 h_i_gid_high;
258	__u32 h_i_author;
259	} hurd2;
260	struct {
261	__u8 m_i_frag; /* Fragment number */
262	__u8 m_i_fsize; /* Fragment size */
263	__u16 m_pad1;
264	__u32 m_i_reserved2[2];
265	} masix2;
266	} osd2; /* OS dependent 2 */
267	__le16 i_extra_isize;
268	__le16 i_pad1;
269	};
270
271	#define i_size_high i_dir_acl
272
273	#if defined(__linux__)
274
275	#define i_reserved1 osd1.linux1.l_i_reserved1
276	#define i_frag osd2.linux2.l_i_frag
277	#define i_fsize osd2.linux2.l_i_fsize
278	#define i_uid_low i_uid
279	#define i_gid_low i_gid
280	#define i_uid_high osd2.linux2.l_i_uid_high
281	#define i_gid_high osd2.linux2.l_i_gid_high
282	#define i_reserved2 osd2.linux2.l_i_reserved2
283
284	#elif defined(__GNU__)
285
286	#define i_translator osd1.hurd1.h_i_translator
287	#define i_frag osd2.hurd2.h_i_frag;
288	#define i_fsize osd2.hurd2.h_i_fsize;
289	#define i_uid_high osd2.hurd2.h_i_uid_high
290	#define i_gid_high osd2.hurd2.h_i_gid_high
291	#define i_author osd2.hurd2.h_i_author
292
293	#elif defined(__masix__)
294
295	#define i_reserved1 osd1.masix1.m_i_reserved1
296	#define i_frag osd2.masix2.m_i_frag
297	#define i_fsize osd2.masix2.m_i_fsize
298	#define i_reserved2 osd2.masix2.m_i_reserved2
299
300	#endif /* defined(__linux__) */
301
302	/*
303	* File system states
304	*/
305	#define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
306	#define EXT3_ERROR_FS 0x0002 /* Errors detected */
307	#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
308
309	/*
310	* Mount flags
311	*/
312	#define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */
313	#define EXT3_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
314	#define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */
315	#define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */
316	#define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
317	#define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
318	#define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
319	#define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
320	#define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
321	#define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */
322	#define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
323	#define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
324	#define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
325	#define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
326	#define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
327	#define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
328	#define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
329	#define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
330	#define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */
331	#define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */
332	#define EXT3_MOUNT_NOBH 0x40000 /* No bufferheads */
333
334	/* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
335	#ifndef _LINUX_EXT2_FS_H
336	#define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
337	#define set_opt(o, opt) o \|= EXT3_MOUNT_##opt
338	#define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
339	EXT3_MOUNT_##opt)
340	#else
341	#define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
342	#define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
343	#define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
344	#endif
345
346	#define ext3_set_bit ext2_set_bit
347	#define ext3_set_bit_atomic ext2_set_bit_atomic
348	#define ext3_clear_bit ext2_clear_bit
349	#define ext3_clear_bit_atomic ext2_clear_bit_atomic
350	#define ext3_test_bit ext2_test_bit
351	#define ext3_find_first_zero_bit ext2_find_first_zero_bit
352	#define ext3_find_next_zero_bit ext2_find_next_zero_bit
353
354	/*
355	* Maximal mount counts between two filesystem checks
356	*/
357	#define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
358	#define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
359
360	/*
361	* Behaviour when detecting errors
362	*/
363	#define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
364	#define EXT3_ERRORS_RO 2 /* Remount fs read-only */
365	#define EXT3_ERRORS_PANIC 3 /* Panic */
366	#define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
367
368	/*
369	* Structure of the super block
370	*/
371	struct ext3_super_block {
372	/00/ __le32 s_inodes_count; /* Inodes count */
373	__le32 s_blocks_count; /* Blocks count */
374	__le32 s_r_blocks_count; /* Reserved blocks count */
375	__le32 s_free_blocks_count; /* Free blocks count */
376	/10/ __le32 s_free_inodes_count; /* Free inodes count */
377	__le32 s_first_data_block; /* First Data Block */
378	__le32 s_log_block_size; /* Block size */
379	__le32 s_log_frag_size; /* Fragment size */
380	/20/ __le32 s_blocks_per_group; /* # Blocks per group */
381	__le32 s_frags_per_group; /* # Fragments per group */
382	__le32 s_inodes_per_group; /* # Inodes per group */
383	__le32 s_mtime; /* Mount time */
384	/30/ __le32 s_wtime; /* Write time */
385	__le16 s_mnt_count; /* Mount count */
386	__le16 s_max_mnt_count; /* Maximal mount count */
387	__le16 s_magic; /* Magic signature */
388	__le16 s_state; /* File system state */
389	__le16 s_errors; /* Behaviour when detecting errors */
390	__le16 s_minor_rev_level; /* minor revision level */
391	/40/ __le32 s_lastcheck; /* time of last check */
392	__le32 s_checkinterval; /* max. time between checks */
393	__le32 s_creator_os; /* OS */
394	__le32 s_rev_level; /* Revision level */
395	/50/ __le16 s_def_resuid; /* Default uid for reserved blocks */
396	__le16 s_def_resgid; /* Default gid for reserved blocks */
397	/*
398	* These fields are for EXT3_DYNAMIC_REV superblocks only.
399	*
400	* Note: the difference between the compatible feature set and
401	* the incompatible feature set is that if there is a bit set
402	* in the incompatible feature set that the kernel doesn't
403	* know about, it should refuse to mount the filesystem.
404	*
405	* e2fsck's requirements are more strict; if it doesn't know
406	* about a feature in either the compatible or incompatible
407	* feature set, it must abort and not try to meddle with
408	* things it doesn't understand...
409	*/
410	__le32 s_first_ino; /* First non-reserved inode */
411	__le16 s_inode_size; /* size of inode structure */
412	__le16 s_block_group_nr; /* block group # of this superblock */
413	__le32 s_feature_compat; /* compatible feature set */
414	/60/ __le32 s_feature_incompat; /* incompatible feature set */
415	__le32 s_feature_ro_compat; /* readonly-compatible feature set */
416	/68/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
417	/78/ char s_volume_name[16]; /* volume name */
418	/88/ char s_last_mounted[64]; /* directory where last mounted */
419	/C8/ __le32 s_algorithm_usage_bitmap; /* For compression */
420	/*
421	* Performance hints. Directory preallocation should only
422	* happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
423	*/
424	__u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
425	__u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
426	__u16 s_reserved_gdt_blocks; /* Per group desc for online growth */
427	/*
428	* Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
429	*/
430	/D0/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
431	/E0/ __le32 s_journal_inum; /* inode number of journal file */
432	__le32 s_journal_dev; /* device number of journal file */
433	__le32 s_last_orphan; /* start of list of inodes to delete */
434	__le32 s_hash_seed[4]; /* HTREE hash seed */
435	__u8 s_def_hash_version; /* Default hash version to use */
436	__u8 s_reserved_char_pad;
437	__u16 s_reserved_word_pad;
438	__le32 s_default_mount_opts;
439	__le32 s_first_meta_bg; /* First metablock block group */
440	__u32 s_reserved[190]; /* Padding to the end of the block */
441	};
442
443	/* Assume that user mode programs are passing in an ext3fs superblock, not
444	* a kernel struct super_block. This will allow us to call the feature-test
445	* macros from user land. */
446	#define EXT3_SB(sb) (sb)
447
448	#define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
449
450	/*
451	* Codes for operating systems
452	*/
453	#define EXT3_OS_LINUX 0
454	#define EXT3_OS_HURD 1
455	#define EXT3_OS_MASIX 2
456	#define EXT3_OS_FREEBSD 3
457	#define EXT3_OS_LITES 4
458
459	/*
460	* Revision levels
461	*/
462	#define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
463	#define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
464
465	#define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
466	#define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
467
468	#define EXT3_GOOD_OLD_INODE_SIZE 128
469
470	/*
471	* Feature set definitions
472	*/
473
474	#define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
475	( EXT3_SB(sb)->s_es->s_feature_compat & __cpu_to_le32(mask) )
476	#define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
477	( EXT3_SB(sb)->s_es->s_feature_ro_compat & __cpu_to_le32(mask) )
478	#define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
479	( EXT3_SB(sb)->s_es->s_feature_incompat & __cpu_to_le32(mask) )
480	#define EXT3_SET_COMPAT_FEATURE(sb,mask) \
481	EXT3_SB(sb)->s_es->s_feature_compat \|= __cpu_to_le32(mask)
482	#define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
483	EXT3_SB(sb)->s_es->s_feature_ro_compat \|= __cpu_to_le32(mask)
484	#define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
485	EXT3_SB(sb)->s_es->s_feature_incompat \|= __cpu_to_le32(mask)
486	#define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
487	EXT3_SB(sb)->s_es->s_feature_compat &= ~__cpu_to_le32(mask)
488	#define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
489	EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~__cpu_to_le32(mask)
490	#define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
491	EXT3_SB(sb)->s_es->s_feature_incompat &= ~__cpu_to_le32(mask)
492
493	#define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
494	#define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
495	#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
496	#define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
497	#define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
498	#define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
499
500	#define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
501	#define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
502	#define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
503
504	#define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
505	#define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
506	#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
507	#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
508	#define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
509
510	#define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
511	#define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE\| \
512	EXT3_FEATURE_INCOMPAT_RECOVER\| \
513	EXT3_FEATURE_INCOMPAT_META_BG)
514	#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER\| \
515	EXT3_FEATURE_RO_COMPAT_LARGE_FILE\| \
516	EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
517
518	/*
519	* Default values for user and/or group using reserved blocks
520	*/
521	#define EXT3_DEF_RESUID 0
522	#define EXT3_DEF_RESGID 0
523
524	/*
525	* Default mount options
526	*/
527	#define EXT3_DEFM_DEBUG 0x0001
528	#define EXT3_DEFM_BSDGROUPS 0x0002
529	#define EXT3_DEFM_XATTR_USER 0x0004
530	#define EXT3_DEFM_ACL 0x0008
531	#define EXT3_DEFM_UID16 0x0010
532	#define EXT3_DEFM_JMODE 0x0060
533	#define EXT3_DEFM_JMODE_DATA 0x0020
534	#define EXT3_DEFM_JMODE_ORDERED 0x0040
535	#define EXT3_DEFM_JMODE_WBACK 0x0060
536
537	/*
538	* Structure of a directory entry
539	*/
540	#define EXT3_NAME_LEN 255
541
542	struct ext3_dir_entry {
543	__le32 inode; /* Inode number */
544	__le16 rec_len; /* Directory entry length */
545	__le16 name_len; /* Name length */
546	char name[EXT3_NAME_LEN]; /* File name */
547	};
548
549	/*
550	* The new version of the directory entry. Since EXT3 structures are
551	* stored in intel byte order, and the name_len field could never be
552	* bigger than 255 chars, it's safe to reclaim the extra byte for the
553	* file_type field.
554	*/
555	struct ext3_dir_entry_2 {
556	__le32 inode; /* Inode number */
557	__le16 rec_len; /* Directory entry length */
558	__u8 name_len; /* Name length */
559	__u8 file_type;
560	char name[EXT3_NAME_LEN]; /* File name */
561	};
562
563	/*
564	* Ext3 directory file types. Only the low 3 bits are used. The
565	* other bits are reserved for now.
566	*/
567	#define EXT3_FT_UNKNOWN 0
568	#define EXT3_FT_REG_FILE 1
569	#define EXT3_FT_DIR 2
570	#define EXT3_FT_CHRDEV 3
571	#define EXT3_FT_BLKDEV 4
572	#define EXT3_FT_FIFO 5
573	#define EXT3_FT_SOCK 6
574	#define EXT3_FT_SYMLINK 7
575
576	#define EXT3_FT_MAX 8
577
578	/*
579	* EXT3_DIR_PAD defines the directory entries boundaries
580	*
581	* NOTE: It must be a multiple of 4
582	*/
583	#define EXT3_DIR_PAD 4
584	#define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
585	#define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
586	~EXT3_DIR_ROUND)
587	/*
588	* Hash Tree Directory indexing
589	* (c) Daniel Phillips, 2001
590	*/
591
592	#ifdef CONFIG_EXT3_INDEX
593	#define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
594	EXT3_FEATURE_COMPAT_DIR_INDEX) && \
595	(EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
596	#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
597	#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 \|\| (dir)->i_nlink == 1)
598	#else
599	#define is_dx(dir) 0
600	#define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
601	#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
602	#endif
603
604	/* Legal values for the dx_root hash_version field: */
605
606	#define DX_HASH_LEGACY 0
607	#define DX_HASH_HALF_MD4 1
608	#define DX_HASH_TEA 2
609
610	/* hash info structure used by the directory hash */
611	struct dx_hash_info
612	{
613	__u32 hash;
614	__u32 minor_hash;
615	__s32 hash_version;
616	__u32 *seed;
617	};
618
619	#define EXT3_HTREE_EOF 0x7fffffff
620
621	#endif /* _LINUX_EXT3_FS_H */

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source: svn/newcon3bcm2_21bu/toolchain/mips-linux-uclibc/include/linux/ext3_fs.h @ 46

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