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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
22/*
23 * The second extended filesystem constants/structures
24 */
25
26/*
27 * Define EXT2FS_DEBUG to produce debug messages
28 */
29#undef EXT2FS_DEBUG
30
31/*
32 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
33 */
34#define EXT2_PREALLOCATE
35#define EXT2_DEFAULT_PREALLOC_BLOCKS 8
36
37/*
38 * The second extended file system version
39 */
40#define EXT2FS_DATE "95/08/09"
41#define EXT2FS_VERSION "0.5b"
42
43/*
44 * Debug code
45 */
46#ifdef EXT2FS_DEBUG
47# define ext2_debug(f, a...) { \
48 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
49 __FILE__, __LINE__, __FUNCTION__); \
50 printk (f, ## a); \
51 }
52#else
53# define ext2_debug(f, a...) /**/
54#endif
55
56/*
57 * Special inode numbers
58 */
59#define EXT2_BAD_INO 1 /* Bad blocks inode */
60#define EXT2_ROOT_INO 2 /* Root inode */
61#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
62#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
63
64/* First non-reserved inode for old ext2 filesystems */
65#define EXT2_GOOD_OLD_FIRST_INO 11
66
67#ifdef __KERNEL__
68#include <linux/ext2_fs_sb.h>
69static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
70{
71 return sb->s_fs_info;
72}
73#else
74/* Assume that user mode programs are passing in an ext2fs superblock, not
75 * a kernel struct super_block. This will allow us to call the feature-test
76 * macros from user land. */
77#define EXT2_SB(sb) (sb)
78#endif
79
80/*
81 * Maximal count of links to a file
82 */
83#define EXT2_LINK_MAX 32000
84
85/*
86 * Macro-instructions used to manage several block sizes
87 */
88#define EXT2_MIN_BLOCK_SIZE 1024
89#define EXT2_MAX_BLOCK_SIZE 4096
90#define EXT2_MIN_BLOCK_LOG_SIZE 10
91#ifdef __KERNEL__
92# define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
93#else
94# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
95#endif
96#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
97#ifdef __KERNEL__
98# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
99#else
100# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
101#endif
102#ifdef __KERNEL__
103#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
104#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
105#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
106#else
107#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
108 EXT2_GOOD_OLD_INODE_SIZE : \
109 (s)->s_inode_size)
110#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
111 EXT2_GOOD_OLD_FIRST_INO : \
112 (s)->s_first_ino)
113#endif
114
115/*
116 * Macro-instructions used to manage fragments
117 */
118#define EXT2_MIN_FRAG_SIZE 1024
119#define EXT2_MAX_FRAG_SIZE 4096
120#define EXT2_MIN_FRAG_LOG_SIZE 10
121#ifdef __KERNEL__
122# define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
123# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
124#else
125# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
126# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
127#endif
128
129/*
130 * Structure of a blocks group descriptor
131 */
132struct ext2_group_desc
133{
134 __le32 bg_block_bitmap; /* Blocks bitmap block */
135 __le32 bg_inode_bitmap; /* Inodes bitmap block */
136 __le32 bg_inode_table; /* Inodes table block */
137 __le16 bg_free_blocks_count; /* Free blocks count */
138 __le16 bg_free_inodes_count; /* Free inodes count */
139 __le16 bg_used_dirs_count; /* Directories count */
140 __le16 bg_pad;
141 __le32 bg_reserved[3];
142};
143
144/*
145 * Macro-instructions used to manage group descriptors
146 */
147#ifdef __KERNEL__
148# define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
149# define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
150# define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
151# define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
152#else
153# define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
154# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
155# define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
156#endif
157
158/*
159 * Constants relative to the data blocks
160 */
161#define EXT2_NDIR_BLOCKS 12
162#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
163#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
164#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
165#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
166
167/*
168 * Inode flags (GETFLAGS/SETFLAGS)
169 */
170#define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
171#define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
172#define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
173#define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
174#define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
175#define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
176#define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
177#define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
178/* Reserved for compression usage... */
179#define EXT2_DIRTY_FL FS_DIRTY_FL
180#define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
181#define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
182#define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
183/* End compression flags --- maybe not all used */
184#define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
185#define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
186#define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
187#define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
188#define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
189#define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
190#define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
191#define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
192
193#define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
194#define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
195
196/*
197 * ioctl commands
198 */
199#define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS
200#define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS
201#define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
202#define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
203
204/*
205 * ioctl commands in 32 bit emulation
206 */
207#define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS
208#define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS
209#define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
210#define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
211
212/*
213 * Structure of an inode on the disk
214 */
215struct ext2_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 __le32 l_i_reserved1;
230 } linux1;
231 struct {
232 __le32 h_i_translator;
233 } hurd1;
234 struct {
235 __le32 m_i_reserved1;
236 } masix1;
237 } osd1; /* OS dependent 1 */
238 __le32 i_block[EXT2_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 __le16 h_i_mode_high;
256 __le16 h_i_uid_high;
257 __le16 h_i_gid_high;
258 __le32 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};
268
269#define i_size_high i_dir_acl
270
271#if defined(__KERNEL__) || defined(__linux__)
272#define i_reserved1 osd1.linux1.l_i_reserved1
273#define i_frag osd2.linux2.l_i_frag
274#define i_fsize osd2.linux2.l_i_fsize
275#define i_uid_low i_uid
276#define i_gid_low i_gid
277#define i_uid_high osd2.linux2.l_i_uid_high
278#define i_gid_high osd2.linux2.l_i_gid_high
279#define i_reserved2 osd2.linux2.l_i_reserved2
280#endif
281
282#ifdef __hurd__
283#define i_translator osd1.hurd1.h_i_translator
284#define i_frag osd2.hurd2.h_i_frag;
285#define i_fsize osd2.hurd2.h_i_fsize;
286#define i_uid_high osd2.hurd2.h_i_uid_high
287#define i_gid_high osd2.hurd2.h_i_gid_high
288#define i_author osd2.hurd2.h_i_author
289#endif
290
291#ifdef __masix__
292#define i_reserved1 osd1.masix1.m_i_reserved1
293#define i_frag osd2.masix2.m_i_frag
294#define i_fsize osd2.masix2.m_i_fsize
295#define i_reserved2 osd2.masix2.m_i_reserved2
296#endif
297
298/*
299 * File system states
300 */
301#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
302#define EXT2_ERROR_FS 0x0002 /* Errors detected */
303
304/*
305 * Mount flags
306 */
307#define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */
308#define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
309#define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
310#define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
311#define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
312#define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
313#define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
314#define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
315#define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
316#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
317#define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
318#define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
319#define EXT2_MOUNT_XIP 0x010000 /* Execute in place */
320#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
321#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
322
323
324#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
325#define set_opt(o, opt) o |= EXT2_MOUNT_##opt
326#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
327 EXT2_MOUNT_##opt)
328/*
329 * Maximal mount counts between two filesystem checks
330 */
331#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
332#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
333
334/*
335 * Behaviour when detecting errors
336 */
337#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
338#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
339#define EXT2_ERRORS_PANIC 3 /* Panic */
340#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
341
342/*
343 * Structure of the super block
344 */
345struct ext2_super_block {
346 __le32 s_inodes_count; /* Inodes count */
347 __le32 s_blocks_count; /* Blocks count */
348 __le32 s_r_blocks_count; /* Reserved blocks count */
349 __le32 s_free_blocks_count; /* Free blocks count */
350 __le32 s_free_inodes_count; /* Free inodes count */
351 __le32 s_first_data_block; /* First Data Block */
352 __le32 s_log_block_size; /* Block size */
353 __le32 s_log_frag_size; /* Fragment size */
354 __le32 s_blocks_per_group; /* # Blocks per group */
355 __le32 s_frags_per_group; /* # Fragments per group */
356 __le32 s_inodes_per_group; /* # Inodes per group */
357 __le32 s_mtime; /* Mount time */
358 __le32 s_wtime; /* Write time */
359 __le16 s_mnt_count; /* Mount count */
360 __le16 s_max_mnt_count; /* Maximal mount count */
361 __le16 s_magic; /* Magic signature */
362 __le16 s_state; /* File system state */
363 __le16 s_errors; /* Behaviour when detecting errors */
364 __le16 s_minor_rev_level; /* minor revision level */
365 __le32 s_lastcheck; /* time of last check */
366 __le32 s_checkinterval; /* max. time between checks */
367 __le32 s_creator_os; /* OS */
368 __le32 s_rev_level; /* Revision level */
369 __le16 s_def_resuid; /* Default uid for reserved blocks */
370 __le16 s_def_resgid; /* Default gid for reserved blocks */
371 /*
372 * These fields are for EXT2_DYNAMIC_REV superblocks only.
373 *
374 * Note: the difference between the compatible feature set and
375 * the incompatible feature set is that if there is a bit set
376 * in the incompatible feature set that the kernel doesn't
377 * know about, it should refuse to mount the filesystem.
378 *
379 * e2fsck's requirements are more strict; if it doesn't know
380 * about a feature in either the compatible or incompatible
381 * feature set, it must abort and not try to meddle with
382 * things it doesn't understand...
383 */
384 __le32 s_first_ino; /* First non-reserved inode */
385 __le16 s_inode_size; /* size of inode structure */
386 __le16 s_block_group_nr; /* block group # of this superblock */
387 __le32 s_feature_compat; /* compatible feature set */
388 __le32 s_feature_incompat; /* incompatible feature set */
389 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
390 __u8 s_uuid[16]; /* 128-bit uuid for volume */
391 char s_volume_name[16]; /* volume name */
392 char s_last_mounted[64]; /* directory where last mounted */
393 __le32 s_algorithm_usage_bitmap; /* For compression */
394 /*
395 * Performance hints. Directory preallocation should only
396 * happen if the EXT2_COMPAT_PREALLOC flag is on.
397 */
398 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
399 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
400 __u16 s_padding1;
401 /*
402 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
403 */
404 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
405 __u32 s_journal_inum; /* inode number of journal file */
406 __u32 s_journal_dev; /* device number of journal file */
407 __u32 s_last_orphan; /* start of list of inodes to delete */
408 __u32 s_hash_seed[4]; /* HTREE hash seed */
409 __u8 s_def_hash_version; /* Default hash version to use */
410 __u8 s_reserved_char_pad;
411 __u16 s_reserved_word_pad;
412 __le32 s_default_mount_opts;
413 __le32 s_first_meta_bg; /* First metablock block group */
414 __u32 s_reserved[190]; /* Padding to the end of the block */
415};
416
417/*
418 * Codes for operating systems
419 */
420#define EXT2_OS_LINUX 0
421#define EXT2_OS_HURD 1
422#define EXT2_OS_MASIX 2
423#define EXT2_OS_FREEBSD 3
424#define EXT2_OS_LITES 4
425
426/*
427 * Revision levels
428 */
429#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
430#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
431
432#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
433#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
434
435#define EXT2_GOOD_OLD_INODE_SIZE 128
436
437/*
438 * Feature set definitions
439 */
440
441#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
442 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
443#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
444 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
445#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
446 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
447#define EXT2_SET_COMPAT_FEATURE(sb,mask) \
448 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
449#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
450 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
451#define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
452 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
453#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
454 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
455#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
456 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
457#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
458 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
459
460#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
461#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
462#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
463#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
464#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
465#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
466#define EXT2_FEATURE_COMPAT_ANY 0xffffffff
467
468#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
469#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
470#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
471#define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
472
473#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
474#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
475#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
476#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
477#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
478#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
479
480#define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
481#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
482 EXT2_FEATURE_INCOMPAT_META_BG)
483#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
484 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
485 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
486#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
487#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
488
489/*
490 * Default values for user and/or group using reserved blocks
491 */
492#define EXT2_DEF_RESUID 0
493#define EXT2_DEF_RESGID 0
494
495/*
496 * Default mount options
497 */
498#define EXT2_DEFM_DEBUG 0x0001
499#define EXT2_DEFM_BSDGROUPS 0x0002
500#define EXT2_DEFM_XATTR_USER 0x0004
501#define EXT2_DEFM_ACL 0x0008
502#define EXT2_DEFM_UID16 0x0010
503 /* Not used by ext2, but reserved for use by ext3 */
504#define EXT3_DEFM_JMODE 0x0060
505#define EXT3_DEFM_JMODE_DATA 0x0020
506#define EXT3_DEFM_JMODE_ORDERED 0x0040
507#define EXT3_DEFM_JMODE_WBACK 0x0060
508
509/*
510 * Structure of a directory entry
511 */
512#define EXT2_NAME_LEN 255
513
514struct ext2_dir_entry {
515 __le32 inode; /* Inode number */
516 __le16 rec_len; /* Directory entry length */
517 __le16 name_len; /* Name length */
518 char name[EXT2_NAME_LEN]; /* File name */
519};
520
521/*
522 * The new version of the directory entry. Since EXT2 structures are
523 * stored in intel byte order, and the name_len field could never be
524 * bigger than 255 chars, it's safe to reclaim the extra byte for the
525 * file_type field.
526 */
527struct ext2_dir_entry_2 {
528 __le32 inode; /* Inode number */
529 __le16 rec_len; /* Directory entry length */
530 __u8 name_len; /* Name length */
531 __u8 file_type;
532 char name[EXT2_NAME_LEN]; /* File name */
533};
534
535/*
536 * Ext2 directory file types. Only the low 3 bits are used. The
537 * other bits are reserved for now.
538 */
539enum {
540 EXT2_FT_UNKNOWN,
541 EXT2_FT_REG_FILE,
542 EXT2_FT_DIR,
543 EXT2_FT_CHRDEV,
544 EXT2_FT_BLKDEV,
545 EXT2_FT_FIFO,
546 EXT2_FT_SOCK,
547 EXT2_FT_SYMLINK,
548 EXT2_FT_MAX
549};
550
551/*
552 * EXT2_DIR_PAD defines the directory entries boundaries
553 *
554 * NOTE: It must be a multiple of 4
555 */
556#define EXT2_DIR_PAD 4
557#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
558#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
559 ~EXT2_DIR_ROUND)
560
561#endif /* _LINUX_EXT2_FS_H */