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