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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 _LINUX_EXT2_FS_H
17#define _LINUX_EXT2_FS_H
18
19#include <linux/types.h>
20#include <linux/magic.h>
21#include <linux/fs.h>
22
23/*
24 * The second extended filesystem constants/structures
25 */
26
27/*
28 * Define EXT2FS_DEBUG to produce debug messages
29 */
30#undef EXT2FS_DEBUG
31
32/*
33 * Define EXT2_RESERVATION to reserve data blocks for expanding files
34 */
35#define EXT2_DEFAULT_RESERVE_BLOCKS 8
36/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
37#define EXT2_MAX_RESERVE_BLOCKS 1027
38#define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
39/*
40 * The second extended file system version
41 */
42#define EXT2FS_DATE "95/08/09"
43#define EXT2FS_VERSION "0.5b"
44
45/*
46 * Debug code
47 */
48#ifdef EXT2FS_DEBUG
49# define ext2_debug(f, a...) { \
50 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
51 __FILE__, __LINE__, __func__); \
52 printk (f, ## a); \
53 }
54#else
55# define ext2_debug(f, a...) /**/
56#endif
57
58/*
59 * Special inode numbers
60 */
61#define EXT2_BAD_INO 1 /* Bad blocks inode */
62#define EXT2_ROOT_INO 2 /* Root inode */
63#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
64#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
65
66/* First non-reserved inode for old ext2 filesystems */
67#define EXT2_GOOD_OLD_FIRST_INO 11
68
69#ifdef __KERNEL__
70#include <linux/ext2_fs_sb.h>
71static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
72{
73 return sb->s_fs_info;
74}
75#else
76/* Assume that user mode programs are passing in an ext2fs superblock, not
77 * a kernel struct super_block. This will allow us to call the feature-test
78 * macros from user land. */
79#define EXT2_SB(sb) (sb)
80#endif
81
82/*
83 * Maximal count of links to a file
84 */
85#define EXT2_LINK_MAX 32000
86
87/*
88 * Macro-instructions used to manage several block sizes
89 */
90#define EXT2_MIN_BLOCK_SIZE 1024
91#define EXT2_MAX_BLOCK_SIZE 4096
92#define EXT2_MIN_BLOCK_LOG_SIZE 10
93#ifdef __KERNEL__
94# define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
95#else
96# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
97#endif
98#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
99#ifdef __KERNEL__
100# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
101#else
102# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
103#endif
104#ifdef __KERNEL__
105#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
106#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
107#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
108#else
109#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
110 EXT2_GOOD_OLD_INODE_SIZE : \
111 (s)->s_inode_size)
112#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
113 EXT2_GOOD_OLD_FIRST_INO : \
114 (s)->s_first_ino)
115#endif
116
117/*
118 * Macro-instructions used to manage fragments
119 */
120#define EXT2_MIN_FRAG_SIZE 1024
121#define EXT2_MAX_FRAG_SIZE 4096
122#define EXT2_MIN_FRAG_LOG_SIZE 10
123#ifdef __KERNEL__
124# define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
125# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
126#else
127# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
128# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
129#endif
130
131/*
132 * Structure of a blocks group descriptor
133 */
134struct ext2_group_desc
135{
136 __le32 bg_block_bitmap; /* Blocks bitmap block */
137 __le32 bg_inode_bitmap; /* Inodes bitmap block */
138 __le32 bg_inode_table; /* Inodes table block */
139 __le16 bg_free_blocks_count; /* Free blocks count */
140 __le16 bg_free_inodes_count; /* Free inodes count */
141 __le16 bg_used_dirs_count; /* Directories count */
142 __le16 bg_pad;
143 __le32 bg_reserved[3];
144};
145
146/*
147 * Macro-instructions used to manage group descriptors
148 */
149#ifdef __KERNEL__
150# define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
151# define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
152# define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
153# define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
154#else
155# define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
156# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
157# define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
158#endif
159
160/*
161 * Constants relative to the data blocks
162 */
163#define EXT2_NDIR_BLOCKS 12
164#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
165#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
166#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
167#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
168
169/*
170 * Inode flags (GETFLAGS/SETFLAGS)
171 */
172#define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
173#define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
174#define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
175#define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
176#define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
177#define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
178#define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
179#define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
180/* Reserved for compression usage... */
181#define EXT2_DIRTY_FL FS_DIRTY_FL
182#define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
183#define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
184#define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
185/* End compression flags --- maybe not all used */
186#define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
187#define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
188#define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
189#define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
190#define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
191#define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
192#define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
193#define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
194
195#define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
196#define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
197
198/* Flags that should be inherited by new inodes from their parent. */
199#define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
200 EXT2_SYNC_FL | EXT2_IMMUTABLE_FL | EXT2_APPEND_FL |\
201 EXT2_NODUMP_FL | EXT2_NOATIME_FL | EXT2_COMPRBLK_FL|\
202 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
203 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
204
205/* Flags that are appropriate for regular files (all but dir-specific ones). */
206#define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
207
208/* Flags that are appropriate for non-directories/regular files. */
209#define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
210
211/* Mask out flags that are inappropriate for the given type of inode. */
212static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
213{
214 if (S_ISDIR(mode))
215 return flags;
216 else if (S_ISREG(mode))
217 return flags & EXT2_REG_FLMASK;
218 else
219 return flags & EXT2_OTHER_FLMASK;
220}
221
222/*
223 * ioctl commands
224 */
225#define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS
226#define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS
227#define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
228#define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
229#define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)
230#define EXT2_IOC_SETRSVSZ _IOW('f', 6, long)
231
232/*
233 * ioctl commands in 32 bit emulation
234 */
235#define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS
236#define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS
237#define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
238#define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
239
240/*
241 * Structure of an inode on the disk
242 */
243struct ext2_inode {
244 __le16 i_mode; /* File mode */
245 __le16 i_uid; /* Low 16 bits of Owner Uid */
246 __le32 i_size; /* Size in bytes */
247 __le32 i_atime; /* Access time */
248 __le32 i_ctime; /* Creation time */
249 __le32 i_mtime; /* Modification time */
250 __le32 i_dtime; /* Deletion Time */
251 __le16 i_gid; /* Low 16 bits of Group Id */
252 __le16 i_links_count; /* Links count */
253 __le32 i_blocks; /* Blocks count */
254 __le32 i_flags; /* File flags */
255 union {
256 struct {
257 __le32 l_i_reserved1;
258 } linux1;
259 struct {
260 __le32 h_i_translator;
261 } hurd1;
262 struct {
263 __le32 m_i_reserved1;
264 } masix1;
265 } osd1; /* OS dependent 1 */
266 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
267 __le32 i_generation; /* File version (for NFS) */
268 __le32 i_file_acl; /* File ACL */
269 __le32 i_dir_acl; /* Directory ACL */
270 __le32 i_faddr; /* Fragment address */
271 union {
272 struct {
273 __u8 l_i_frag; /* Fragment number */
274 __u8 l_i_fsize; /* Fragment size */
275 __u16 i_pad1;
276 __le16 l_i_uid_high; /* these 2 fields */
277 __le16 l_i_gid_high; /* were reserved2[0] */
278 __u32 l_i_reserved2;
279 } linux2;
280 struct {
281 __u8 h_i_frag; /* Fragment number */
282 __u8 h_i_fsize; /* Fragment size */
283 __le16 h_i_mode_high;
284 __le16 h_i_uid_high;
285 __le16 h_i_gid_high;
286 __le32 h_i_author;
287 } hurd2;
288 struct {
289 __u8 m_i_frag; /* Fragment number */
290 __u8 m_i_fsize; /* Fragment size */
291 __u16 m_pad1;
292 __u32 m_i_reserved2[2];
293 } masix2;
294 } osd2; /* OS dependent 2 */
295};
296
297#define i_size_high i_dir_acl
298
299#if defined(__KERNEL__) || defined(__linux__)
300#define i_reserved1 osd1.linux1.l_i_reserved1
301#define i_frag osd2.linux2.l_i_frag
302#define i_fsize osd2.linux2.l_i_fsize
303#define i_uid_low i_uid
304#define i_gid_low i_gid
305#define i_uid_high osd2.linux2.l_i_uid_high
306#define i_gid_high osd2.linux2.l_i_gid_high
307#define i_reserved2 osd2.linux2.l_i_reserved2
308#endif
309
310#ifdef __hurd__
311#define i_translator osd1.hurd1.h_i_translator
312#define i_frag osd2.hurd2.h_i_frag
313#define i_fsize osd2.hurd2.h_i_fsize
314#define i_uid_high osd2.hurd2.h_i_uid_high
315#define i_gid_high osd2.hurd2.h_i_gid_high
316#define i_author osd2.hurd2.h_i_author
317#endif
318
319#ifdef __masix__
320#define i_reserved1 osd1.masix1.m_i_reserved1
321#define i_frag osd2.masix2.m_i_frag
322#define i_fsize osd2.masix2.m_i_fsize
323#define i_reserved2 osd2.masix2.m_i_reserved2
324#endif
325
326/*
327 * File system states
328 */
329#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
330#define EXT2_ERROR_FS 0x0002 /* Errors detected */
331
332/*
333 * Mount flags
334 */
335#define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */
336#define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
337#define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
338#define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
339#define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
340#define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
341#define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
342#define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
343#define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
344#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
345#define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
346#define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
347#define EXT2_MOUNT_XIP 0x010000 /* Execute in place */
348#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
349#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
350#define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
351
352
353#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
354#define set_opt(o, opt) o |= EXT2_MOUNT_##opt
355#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
356 EXT2_MOUNT_##opt)
357/*
358 * Maximal mount counts between two filesystem checks
359 */
360#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
361#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
362
363/*
364 * Behaviour when detecting errors
365 */
366#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
367#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
368#define EXT2_ERRORS_PANIC 3 /* Panic */
369#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
370
371/*
372 * Structure of the super block
373 */
374struct ext2_super_block {
375 __le32 s_inodes_count; /* Inodes count */
376 __le32 s_blocks_count; /* Blocks count */
377 __le32 s_r_blocks_count; /* Reserved blocks count */
378 __le32 s_free_blocks_count; /* Free blocks count */
379 __le32 s_free_inodes_count; /* Free inodes count */
380 __le32 s_first_data_block; /* First Data Block */
381 __le32 s_log_block_size; /* Block size */
382 __le32 s_log_frag_size; /* Fragment size */
383 __le32 s_blocks_per_group; /* # Blocks per group */
384 __le32 s_frags_per_group; /* # Fragments per group */
385 __le32 s_inodes_per_group; /* # Inodes per group */
386 __le32 s_mtime; /* Mount time */
387 __le32 s_wtime; /* Write time */
388 __le16 s_mnt_count; /* Mount count */
389 __le16 s_max_mnt_count; /* Maximal mount count */
390 __le16 s_magic; /* Magic signature */
391 __le16 s_state; /* File system state */
392 __le16 s_errors; /* Behaviour when detecting errors */
393 __le16 s_minor_rev_level; /* minor revision level */
394 __le32 s_lastcheck; /* time of last check */
395 __le32 s_checkinterval; /* max. time between checks */
396 __le32 s_creator_os; /* OS */
397 __le32 s_rev_level; /* Revision level */
398 __le16 s_def_resuid; /* Default uid for reserved blocks */
399 __le16 s_def_resgid; /* Default gid for reserved blocks */
400 /*
401 * These fields are for EXT2_DYNAMIC_REV superblocks only.
402 *
403 * Note: the difference between the compatible feature set and
404 * the incompatible feature set is that if there is a bit set
405 * in the incompatible feature set that the kernel doesn't
406 * know about, it should refuse to mount the filesystem.
407 *
408 * e2fsck's requirements are more strict; if it doesn't know
409 * about a feature in either the compatible or incompatible
410 * feature set, it must abort and not try to meddle with
411 * things it doesn't understand...
412 */
413 __le32 s_first_ino; /* First non-reserved inode */
414 __le16 s_inode_size; /* size of inode structure */
415 __le16 s_block_group_nr; /* block group # of this superblock */
416 __le32 s_feature_compat; /* compatible feature set */
417 __le32 s_feature_incompat; /* incompatible feature set */
418 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
419 __u8 s_uuid[16]; /* 128-bit uuid for volume */
420 char s_volume_name[16]; /* volume name */
421 char s_last_mounted[64]; /* directory where last mounted */
422 __le32 s_algorithm_usage_bitmap; /* For compression */
423 /*
424 * Performance hints. Directory preallocation should only
425 * happen if the EXT2_COMPAT_PREALLOC flag is on.
426 */
427 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
428 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
429 __u16 s_padding1;
430 /*
431 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
432 */
433 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
434 __u32 s_journal_inum; /* inode number of journal file */
435 __u32 s_journal_dev; /* device number of journal file */
436 __u32 s_last_orphan; /* start of list of inodes to delete */
437 __u32 s_hash_seed[4]; /* HTREE hash seed */
438 __u8 s_def_hash_version; /* Default hash version to use */
439 __u8 s_reserved_char_pad;
440 __u16 s_reserved_word_pad;
441 __le32 s_default_mount_opts;
442 __le32 s_first_meta_bg; /* First metablock block group */
443 __u32 s_reserved[190]; /* Padding to the end of the block */
444};
445
446/*
447 * Codes for operating systems
448 */
449#define EXT2_OS_LINUX 0
450#define EXT2_OS_HURD 1
451#define EXT2_OS_MASIX 2
452#define EXT2_OS_FREEBSD 3
453#define EXT2_OS_LITES 4
454
455/*
456 * Revision levels
457 */
458#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
459#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
460
461#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
462#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
463
464#define EXT2_GOOD_OLD_INODE_SIZE 128
465
466/*
467 * Feature set definitions
468 */
469
470#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
471 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
472#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
473 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
474#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
475 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
476#define EXT2_SET_COMPAT_FEATURE(sb,mask) \
477 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
478#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
479 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
480#define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
481 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
482#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
483 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
484#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
485 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
486#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
487 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
488
489#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
490#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
491#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
492#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
493#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
494#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
495#define EXT2_FEATURE_COMPAT_ANY 0xffffffff
496
497#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
498#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
499#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
500#define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
501
502#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
503#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
504#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
505#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
506#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
507#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
508
509#define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
510#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
511 EXT2_FEATURE_INCOMPAT_META_BG)
512#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
513 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
514 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
515#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
516#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
517
518/*
519 * Default values for user and/or group using reserved blocks
520 */
521#define EXT2_DEF_RESUID 0
522#define EXT2_DEF_RESGID 0
523
524/*
525 * Default mount options
526 */
527#define EXT2_DEFM_DEBUG 0x0001
528#define EXT2_DEFM_BSDGROUPS 0x0002
529#define EXT2_DEFM_XATTR_USER 0x0004
530#define EXT2_DEFM_ACL 0x0008
531#define EXT2_DEFM_UID16 0x0010
532 /* Not used by ext2, but reserved for use by ext3 */
533#define EXT3_DEFM_JMODE 0x0060
534#define EXT3_DEFM_JMODE_DATA 0x0020
535#define EXT3_DEFM_JMODE_ORDERED 0x0040
536#define EXT3_DEFM_JMODE_WBACK 0x0060
537
538/*
539 * Structure of a directory entry
540 */
541#define EXT2_NAME_LEN 255
542
543struct ext2_dir_entry {
544 __le32 inode; /* Inode number */
545 __le16 rec_len; /* Directory entry length */
546 __le16 name_len; /* Name length */
547 char name[EXT2_NAME_LEN]; /* File name */
548};
549
550/*
551 * The new version of the directory entry. Since EXT2 structures are
552 * stored in intel byte order, and the name_len field could never be
553 * bigger than 255 chars, it's safe to reclaim the extra byte for the
554 * file_type field.
555 */
556struct ext2_dir_entry_2 {
557 __le32 inode; /* Inode number */
558 __le16 rec_len; /* Directory entry length */
559 __u8 name_len; /* Name length */
560 __u8 file_type;
561 char name[EXT2_NAME_LEN]; /* File name */
562};
563
564/*
565 * Ext2 directory file types. Only the low 3 bits are used. The
566 * other bits are reserved for now.
567 */
568enum {
569 EXT2_FT_UNKNOWN = 0,
570 EXT2_FT_REG_FILE = 1,
571 EXT2_FT_DIR = 2,
572 EXT2_FT_CHRDEV = 3,
573 EXT2_FT_BLKDEV = 4,
574 EXT2_FT_FIFO = 5,
575 EXT2_FT_SOCK = 6,
576 EXT2_FT_SYMLINK = 7,
577 EXT2_FT_MAX
578};
579
580/*
581 * EXT2_DIR_PAD defines the directory entries boundaries
582 *
583 * NOTE: It must be a multiple of 4
584 */
585#define EXT2_DIR_PAD 4
586#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
587#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
588 ~EXT2_DIR_ROUND)
589#define EXT2_MAX_REC_LEN ((1<<16)-1)
590
591#endif /* _LINUX_EXT2_FS_H */