kernel: Move GPL'd kernel files to sys/gnu to have them all in one place.
[dragonfly.git] / sys / gnu / vfs / ext2fs / ext2_fs.h
CommitLineData
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1/*
2 * modified for EXT2FS support in Lites 1.1
3 *
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
6 *
7 * $FreeBSD: src/sys/gnu/ext2fs/ext2_fs.h,v 1.8.2.2 2001/09/29 12:52:47 iedowse Exp $
8 */
9/*
10 * linux/include/linux/ext2_fs.h
11 *
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise Pascal
15 * Universite Pierre et Marie Curie (Paris VI)
16 *
17 * from
18 *
19 * linux/include/linux/minix_fs.h
20 *
21 * Copyright (C) 1991, 1992 Linus Torvalds
22 */
23
24#ifndef _LINUX_EXT2_FS_H
25#define _LINUX_EXT2_FS_H
26
27#include <sys/types.h>
99dd49c5 28#include <sys/ioccom.h>
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29
30#define __u32 u_int32_t
31#define u32 u_int32_t
32#define __u16 u_int16_t
33#define __u8 u_int8_t
34
35#define __s32 int32_t
36#define __s16 int16_t
37#define __s8 int8_t
38
39#define umode_t mode_t
40#define loff_t off_t
41
42/* the Linux implementation of EXT2 stores some information about
43 * an inode in a ext2_inode_info structure which is part of the incore
44 * inode in Linux
45 * I decided to use the "spare" fields instead - we'll see how this
46 * works out
47 */
48
49#define i_block_group i_spare[0]
50#define i_next_alloc_block i_spare[1]
51#define i_next_alloc_goal i_spare[2]
52#define i_prealloc_block i_din.di_spare[0]
53#define i_prealloc_count i_din.di_spare[1]
54
55/*
56 * The second extended filesystem constants/structures
57 */
58
59/*
60 * Define EXT2FS_DEBUG to produce debug messages
61 */
62#undef EXT2FS_DEBUG
63
64/*
65 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
66 */
67#define EXT2_PREALLOCATE
68#define EXT2_DEFAULT_PREALLOC_BLOCKS 8
69
70/*
71 * The second extended file system version
72 */
73#define EXT2FS_DATE "95/08/09"
74#define EXT2FS_VERSION "0.5b"
75
76/*
77 * Debug code
78 */
79#ifdef EXT2FS_DEBUG
80# define ext2_debug(f, a...) { \
086c1d7e 81 kprintf ("EXT2-fs DEBUG (%s, %d): %s:", \
5e2195bf 82 __FILE__, __LINE__, __func__); \
b993bb87 83 kprintf (f, ## a); \
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84 }
85#else
86# define ext2_debug(f, a...) /**/
87#endif
88
89/*
90 * Special inodes numbers
91 */
92#define EXT2_BAD_INO 1 /* Bad blocks inode */
93#define EXT2_ROOT_INO 2 /* Root inode */
94#define EXT2_ACL_IDX_INO 3 /* ACL inode */
95#define EXT2_ACL_DATA_INO 4 /* ACL inode */
96#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
97#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
98
99/* First non-reserved inode for old ext2 filesystems */
100#define EXT2_GOOD_OLD_FIRST_INO 11
101
102/*
103 * The second extended file system magic number
104 */
105#define EXT2_SUPER_MAGIC 0xEF53
106
107/*
108 * Maximal count of links to a file
109 */
110#define EXT2_LINK_MAX 32000
111
112/*
113 * Note: under FreeBSD, the "user" versions of the following macros are
114 * used (and must be used) in most cases, because ((s)->u.ext2_sb.s_es is
115 * not accessible. This depends on __KERNEL__ not being defined for
116 * kernel builds under FreeBSD.
117 */
118
119/*
120 * Macro-instructions used to manage several block sizes
121 */
122#define EXT2_MIN_BLOCK_SIZE 1024
123#define EXT2_MAX_BLOCK_SIZE 4096
124#define EXT2_MIN_BLOCK_LOG_SIZE 10
08c23b99 125#if defined(__KERNEL__) || (defined(__DragonFly__) && defined(_KERNEL))
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126# define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
127#else
128# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
129#endif
130#define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
131#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
132#ifdef __KERNEL__
133# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
134#else
135# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
136#endif
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137#if defined(__KERNEL__) || defined _KERNEL
138#define EXT2_ADDR_PER_BLOCK_BITS(s) ((s)->s_addr_per_block_bits)
139#define EXT2_INODE_SIZE(s) ((s)->s_inode_size)
140#define EXT2_FIRST_INO(s) ((s)->s_first_ino)
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141#else
142#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
143 EXT2_GOOD_OLD_INODE_SIZE : \
144 (s)->s_inode_size)
145#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
146 EXT2_GOOD_OLD_FIRST_INO : \
147 (s)->s_first_ino)
148#endif
984263bc 149#define EXT2_INODES_PER_BLOCK(s) ((s)->s_inodes_per_block)
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150/*
151 * Macro-instructions used to manage fragments
152 */
153#define EXT2_MIN_FRAG_SIZE 1024
154#define EXT2_MAX_FRAG_SIZE 4096
155#define EXT2_MIN_FRAG_LOG_SIZE 10
156#ifdef __KERNEL__
157# define EXT2_FRAG_SIZE(s) ((s)->u.ext2_sb.s_frag_size)
158# define EXT2_FRAGS_PER_BLOCK(s) ((s)->u.ext2_sb.s_frags_per_block)
159#else
08c23b99 160# if defined(_KERNEL) && defined(__DragonFly__)
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161# define EXT2_FRAG_SIZE(s) ((s)->s_frag_size)
162# else
163# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
164# endif
165# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
166#endif
167
168/*
169 * ACL structures
170 */
171struct ext2_acl_header /* Header of Access Control Lists */
172{
173 __u32 aclh_size;
174 __u32 aclh_file_count;
175 __u32 aclh_acle_count;
176 __u32 aclh_first_acle;
177};
178
179struct ext2_acl_entry /* Access Control List Entry */
180{
181 __u32 acle_size;
182 __u16 acle_perms; /* Access permissions */
183 __u16 acle_type; /* Type of entry */
184 __u16 acle_tag; /* User or group identity */
185 __u16 acle_pad1;
186 __u32 acle_next; /* Pointer on next entry for the */
187 /* same inode or on next free entry */
188};
189
190/*
191 * Structure of a blocks group descriptor
192 */
193struct ext2_group_desc
194{
195 __u32 bg_block_bitmap; /* Blocks bitmap block */
196 __u32 bg_inode_bitmap; /* Inodes bitmap block */
197 __u32 bg_inode_table; /* Inodes table block */
198 __u16 bg_free_blocks_count; /* Free blocks count */
199 __u16 bg_free_inodes_count; /* Free inodes count */
200 __u16 bg_used_dirs_count; /* Directories count */
201 __u16 bg_pad;
202 __u32 bg_reserved[3];
203};
204
205/*
206 * Macro-instructions used to manage group descriptors
207 */
208#ifdef __KERNEL__
209# define EXT2_BLOCKS_PER_GROUP(s) ((s)->u.ext2_sb.s_blocks_per_group)
210# define EXT2_DESC_PER_BLOCK(s) ((s)->u.ext2_sb.s_desc_per_block)
211# define EXT2_INODES_PER_GROUP(s) ((s)->u.ext2_sb.s_inodes_per_group)
212# define EXT2_DESC_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_desc_per_block_bits)
213#else
214# define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
215# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
216# define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
217#endif
218
219/*
220 * Constants relative to the data blocks
221 */
222#define EXT2_NDIR_BLOCKS 12
223#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
224#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
225#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
226#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
227#define EXT2_MAXSYMLINKLEN (EXT2_N_BLOCKS * sizeof (__u32))
228
229/*
230 * Inode flags
231 */
232#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
233#define EXT2_UNRM_FL 0x00000002 /* Undelete */
234#define EXT2_COMPR_FL 0x00000004 /* Compress file */
235#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
236#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
237#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
238#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
239#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
240/* Reserved for compression usage... */
241#define EXT2_DIRTY_FL 0x00000100
242#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
243#define EXT2_NOCOMP_FL 0x00000400 /* Don't compress */
244#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
b993bb87 245/* End compression flags --- maybe not all used */
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246#define EXT2_BTREE_FL 0x00001000 /* btree format dir */
247#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
248
249#define EXT2_FL_USER_VISIBLE 0x00001FFF /* User visible flags */
250#define EXT2_FL_USER_MODIFIABLE 0x000000FF /* User modifiable flags */
251
252/*
253 * ioctl commands
254 */
255#define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
256#define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
257#define EXT2_IOC_GETVERSION _IOR('v', 1, long)
258#define EXT2_IOC_SETVERSION _IOW('v', 2, long)
259
260/*
1f2de5d4 261 * Only declare `struct ext2_inode' if <vfs/ufs/inode.h> hasn't made things
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262 * difficult by #defining i_mode and other struct members. The details of
263 * the struct are only needed in ext2_inode_cnv.c where the ext2fs on-disk
264 * inode is converted to a ufs in-core inode.
265 */
266#ifndef i_mode
267
268/*
269 * Structure of an inode on the disk
270 */
271struct ext2_inode {
272 __u16 i_mode; /* File mode */
273 __u16 i_uid; /* Owner Uid */
274 __u32 i_size; /* Size in bytes */
275 __u32 i_atime; /* Access time */
276 __u32 i_ctime; /* Creation time */
277 __u32 i_mtime; /* Modification time */
278 __u32 i_dtime; /* Deletion Time */
279 __u16 i_gid; /* Group Id */
280 __u16 i_links_count; /* Links count */
281 __u32 i_blocks; /* Blocks count */
282 __u32 i_flags; /* File flags */
283 union {
284 struct {
285 __u32 l_i_reserved1;
286 } linux1;
287 struct {
288 __u32 h_i_translator;
289 } hurd1;
290 struct {
291 __u32 m_i_reserved1;
292 } masix1;
293 } osd1; /* OS dependent 1 */
294 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
295 __u32 i_generation; /* File version (for NFS) */
296 __u32 i_file_acl; /* File ACL */
297 __u32 i_dir_acl; /* Directory ACL */
298 __u32 i_faddr; /* Fragment address */
299 union {
300 struct {
301 __u8 l_i_frag; /* Fragment number */
302 __u8 l_i_fsize; /* Fragment size */
303 __u16 i_pad1;
304 __u32 l_i_reserved2[2];
305 } linux2;
306 struct {
307 __u8 h_i_frag; /* Fragment number */
308 __u8 h_i_fsize; /* Fragment size */
309 __u16 h_i_mode_high;
310 __u16 h_i_uid_high;
311 __u16 h_i_gid_high;
312 __u32 h_i_author;
313 } hurd2;
314 struct {
315 __u8 m_i_frag; /* Fragment number */
316 __u8 m_i_fsize; /* Fragment size */
317 __u16 m_pad1;
318 __u32 m_i_reserved2[2];
319 } masix2;
320 } osd2; /* OS dependent 2 */
321};
322
323#define i_size_high i_dir_acl
324
325#if defined(__KERNEL__) || defined(__linux__)
326#define i_reserved1 osd1.linux1.l_i_reserved1
327#define i_frag osd2.linux2.l_i_frag
328#define i_fsize osd2.linux2.l_i_fsize
329#define i_reserved2 osd2.linux2.l_i_reserved2
330#endif
331
332#ifdef __hurd__
333#define i_translator osd1.hurd1.h_i_translator
334#define i_frag osd2.hurd2.h_i_frag;
335#define i_fsize osd2.hurd2.h_i_fsize;
336#define i_uid_high osd2.hurd2.h_i_uid_high
337#define i_gid_high osd2.hurd2.h_i_gid_high
338#define i_author osd2.hurd2.h_i_author
339#endif
340
341#ifdef __masix__
342#define i_reserved1 osd1.masix1.m_i_reserved1
343#define i_frag osd2.masix2.m_i_frag
344#define i_fsize osd2.masix2.m_i_fsize
345#define i_reserved2 osd2.masix2.m_i_reserved2
346#endif
347
348#endif /* i_mode */
349
350/*
351 * File system states
352 */
353#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
354#define EXT2_ERROR_FS 0x0002 /* Errors detected */
355
356/*
357 * Mount flags
358 */
359#define EXT2_MOUNT_CHECK_NORMAL 0x0001 /* Do some more checks */
360#define EXT2_MOUNT_CHECK_STRICT 0x0002 /* Do again more checks */
361#define EXT2_MOUNT_CHECK (EXT2_MOUNT_CHECK_NORMAL | \
362 EXT2_MOUNT_CHECK_STRICT)
363#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
364#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
365#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
366#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
367#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
368#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
369
370#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
371#define set_opt(o, opt) o |= EXT2_MOUNT_##opt
372#define test_opt(sb, opt) ((sb)->u.ext2_sb.s_mount_opt & \
373 EXT2_MOUNT_##opt)
374/*
375 * Maximal mount counts between two filesystem checks
376 */
377#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
378#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
379
380/*
381 * Behaviour when detecting errors
382 */
383#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
384#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
385#define EXT2_ERRORS_PANIC 3 /* Panic */
386#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
387
388/*
389 * Structure of the super block
390 */
391struct ext2_super_block {
392 __u32 s_inodes_count; /* Inodes count */
393 __u32 s_blocks_count; /* Blocks count */
394 __u32 s_r_blocks_count; /* Reserved blocks count */
395 __u32 s_free_blocks_count; /* Free blocks count */
396 __u32 s_free_inodes_count; /* Free inodes count */
397 __u32 s_first_data_block; /* First Data Block */
398 __u32 s_log_block_size; /* Block size */
399 __s32 s_log_frag_size; /* Fragment size */
400 __u32 s_blocks_per_group; /* # Blocks per group */
401 __u32 s_frags_per_group; /* # Fragments per group */
402 __u32 s_inodes_per_group; /* # Inodes per group */
403 __u32 s_mtime; /* Mount time */
404 __u32 s_wtime; /* Write time */
405 __u16 s_mnt_count; /* Mount count */
406 __s16 s_max_mnt_count; /* Maximal mount count */
407 __u16 s_magic; /* Magic signature */
408 __u16 s_state; /* File system state */
409 __u16 s_errors; /* Behaviour when detecting errors */
410 __u16 s_minor_rev_level; /* minor revision level */
411 __u32 s_lastcheck; /* time of last check */
412 __u32 s_checkinterval; /* max. time between checks */
413 __u32 s_creator_os; /* OS */
414 __u32 s_rev_level; /* Revision level */
415 __u16 s_def_resuid; /* Default uid for reserved blocks */
416 __u16 s_def_resgid; /* Default gid for reserved blocks */
417 /*
418 * These fields are for EXT2_DYNAMIC_REV superblocks only.
419 *
420 * Note: the difference between the compatible feature set and
421 * the incompatible feature set is that if there is a bit set
422 * in the incompatible feature set that the kernel doesn't
423 * know about, it should refuse to mount the filesystem.
b993bb87 424 *
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425 * e2fsck's requirements are more strict; if it doesn't know
426 * about a feature in either the compatible or incompatible
427 * feature set, it must abort and not try to meddle with
428 * things it doesn't understand...
429 */
430 __u32 s_first_ino; /* First non-reserved inode */
431 __u16 s_inode_size; /* size of inode structure */
432 __u16 s_block_group_nr; /* block group # of this superblock */
433 __u32 s_feature_compat; /* compatible feature set */
434 __u32 s_feature_incompat; /* incompatible feature set */
435 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
436 __u8 s_uuid[16]; /* 128-bit uuid for volume */
437 char s_volume_name[16]; /* volume name */
438 char s_last_mounted[64]; /* directory where last mounted */
439 __u32 s_algorithm_usage_bitmap; /* For compression */
440 /*
441 * Performance hints. Directory preallocation should only
442 * happen if the EXT2_COMPAT_PREALLOC flag is on.
443 */
444 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
445 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
446 __u16 s_padding1;
447 __u32 s_reserved[204]; /* Padding to the end of the block */
448};
449
450#ifdef __KERNEL__
451#define EXT2_SB(sb) (&((sb)->u.ext2_sb))
452#else
453/* Assume that user mode programs are passing in an ext2fs superblock, not
454 * a kernel struct super_block. This will allow us to call the feature-test
455 * macros from user land. */
456#define EXT2_SB(sb) (sb)
457#endif
458
459/*
460 * Codes for operating systems
461 */
462#define EXT2_OS_LINUX 0
463#define EXT2_OS_HURD 1
464#define EXT2_OS_MASIX 2
465#define EXT2_OS_FREEBSD 3
466#define EXT2_OS_LITES 4
467
468/*
469 * Revision levels
470 */
471#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
472#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
473
474#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
475#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
476
477#define EXT2_GOOD_OLD_INODE_SIZE 128
478
479/*
480 * Feature set definitions
481 */
482
483#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
484 ( EXT2_SB(sb)->s_feature_compat & (mask) )
485#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
486 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
487#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
488 ( EXT2_SB(sb)->s_feature_incompat & (mask) )
489
490#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
491
492#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
493#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
494#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
495
496#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
497#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
498
499#define EXT2_FEATURE_COMPAT_SUPP 0
500#define EXT2_FEATURE_INCOMPAT_SUPP EXT2_FEATURE_INCOMPAT_FILETYPE
501#ifdef notyet
502#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
503 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
504 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
505#else
506#define EXT2_FEATURE_RO_COMPAT_SUPP EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
507#endif
508
509/*
510 * Default values for user and/or group using reserved blocks
511 */
512#define EXT2_DEF_RESUID 0
513#define EXT2_DEF_RESGID 0
514
515/*
516 * Structure of a directory entry
517 */
518#define EXT2_NAME_LEN 255
519
520struct ext2_dir_entry {
521 __u32 inode; /* Inode number */
522 __u16 rec_len; /* Directory entry length */
523 __u16 name_len; /* Name length */
524 char name[EXT2_NAME_LEN]; /* File name */
525};
526
527/*
528 * The new version of the directory entry. Since EXT2 structures are
529 * stored in intel byte order, and the name_len field could never be
530 * bigger than 255 chars, it's safe to reclaim the extra byte for the
531 * file_type field.
532 */
533struct ext2_dir_entry_2 {
534 __u32 inode; /* Inode number */
535 __u16 rec_len; /* Directory entry length */
536 __u8 name_len; /* Name length */
537 __u8 file_type;
538 char name[EXT2_NAME_LEN]; /* File name */
539};
540
541/*
542 * Ext2 directory file types. Only the low 3 bits are used. The
543 * other bits are reserved for now.
544 */
545#define EXT2_FT_UNKNOWN 0
546#define EXT2_FT_REG_FILE 1
547#define EXT2_FT_DIR 2
548#define EXT2_FT_CHRDEV 3
549#define EXT2_FT_BLKDEV 4
550#define EXT2_FT_FIFO 5
551#define EXT2_FT_SOCK 6
552#define EXT2_FT_SYMLINK 7
553
554#define EXT2_FT_MAX 8
555
556/*
557 * EXT2_DIR_PAD defines the directory entries boundaries
558 *
559 * NOTE: It must be a multiple of 4
560 */
561#define EXT2_DIR_PAD 4
562#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
563#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
564 ~EXT2_DIR_ROUND)
565
566#endif /* _LINUX_EXT2_FS_H */