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1.1 root 1: /*
2: * This file has been copied from
3: * linux/include/linux/ext2_fs.h
4: *
5: * Copyright (C) 1992, 1993, 1994, 1995
6: * Remy Card ([email protected])
7: * Laboratoire MASI - Institut Blaise Pascal
8: * Universite Pierre et Marie Curie (Paris VI)
9: *
10: * from
11: *
12: * linux/include/linux/minix_fs.h
13: *
14: * Copyright (C) 1991, 1992 Linus Torvalds
15: */
16:
17: #ifndef _EXT2_FS_H
18: #define _EXT2_FS_H
19:
20: /* from /usr/include/linux/magic.h */
21:
22: #define EXT2_SUPER_MAGIC 0xEF53
23:
24: /*
25: * The second extended filesystem constants/structures
26: */
27:
28: /*
29: * Define EXT2FS_DEBUG to produce debug messages
30: */
31: #undef EXT2FS_DEBUG
32:
33: /*
34: * Define EXT2_RESERVATION to reserve data blocks for expanding files
35: */
36: #define EXT2_DEFAULT_RESERVE_BLOCKS 8
37: /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
38: #define EXT2_MAX_RESERVE_BLOCKS 1027
39: #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
40: /*
41: * The second extended file system version
42: */
43: #define EXT2FS_DATE "95/08/09"
44: #define EXT2FS_VERSION "0.5b"
45:
46: /*
47: * Debug code
48: */
49: #ifdef EXT2FS_DEBUG
50: # define ext2_debug(f, a...) { \
51: printk ("EXT2-fs DEBUG (%s, %d): %s:", \
52: __FILE__, __LINE__, __FUNCTION__); \
53: printk (f, ## a); \
54: }
55: #else
56: # define ext2_debug(f, a...) /**/
57: #endif
58:
59: /*
60: * Special inode numbers
61: */
62: #define EXT2_BAD_INO 1 /* Bad blocks inode */
63: #define EXT2_ROOT_INO 2 /* Root inode */
64: #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
65: #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
66:
67: /* First non-reserved inode for old ext2 filesystems */
68: #define EXT2_GOOD_OLD_FIRST_INO 11
69:
70: /* Assume that user mode programs are passing in an ext2fs superblock, not
71: * a kernel struct super_block. This will allow us to call the feature-test
72: * macros from user land. */
73: #define EXT2_SB(sb) (sb)
74:
75: /*
76: * Maximal count of links to a file
77: */
78: #define EXT2_LINK_MAX 32000
79:
80: /*
81: * Macro-instructions used to manage several block sizes
82: */
83: #define EXT2_MIN_BLOCK_SIZE 1024
84: #define EXT2_MAX_BLOCK_SIZE 4096
85: #define EXT2_MIN_BLOCK_LOG_SIZE 10
86: # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
87: #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (uint32_t))
88: # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
89: #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
90: EXT2_GOOD_OLD_INODE_SIZE : \
91: (s)->s_inode_size)
92: #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
93: EXT2_GOOD_OLD_FIRST_INO : \
94: (s)->s_first_ino)
95:
96: /*
97: * Macro-instructions used to manage fragments
98: */
99: #define EXT2_MIN_FRAG_SIZE 1024
100: #define EXT2_MAX_FRAG_SIZE 4096
101: #define EXT2_MIN_FRAG_LOG_SIZE 10
102: # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
103: # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
104:
105: /*
106: * Structure of a blocks group descriptor
107: */
108: struct ext2_group_desc
109: {
110: uint32_t bg_block_bitmap; /* Blocks bitmap block */
111: uint32_t bg_inode_bitmap; /* Inodes bitmap block */
112: uint32_t bg_inode_table; /* Inodes table block */
113: uint16_t bg_free_blocks_count; /* Free blocks count */
114: uint16_t bg_free_inodes_count; /* Free inodes count */
115: uint16_t bg_used_dirs_count; /* Directories count */
116: uint16_t bg_pad;
117: uint32_t bg_reserved[3];
118: };
119:
120: /*
121: * Macro-instructions used to manage group descriptors
122: */
123: # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
124: # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
125: # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
126:
127: /*
128: * Constants relative to the data blocks
129: */
130: #define EXT2_NDIR_BLOCKS 12
131: #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
132: #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
133: #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
134: #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
135:
136: /*
137: * Inode flags (GETFLAGS/SETFLAGS)
138: */
139: #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
140: #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
141: #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
142: #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
143: #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
144: #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
145: #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
146: #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
147: /* Reserved for compression usage... */
148: #define EXT2_DIRTY_FL FS_DIRTY_FL
149: #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
150: #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
151: #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
152: /* End compression flags --- maybe not all used */
153: #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
154: #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
155: #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
156: #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
157: #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
158: #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
159: #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
160: #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
161:
162: #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
163: #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
164:
165: /*
166: * ioctl commands
167: */
168: #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS
169: #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS
170: #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
171: #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
172: #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)
173: #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long)
174:
175: /*
176: * ioctl commands in 32 bit emulation
177: */
178: #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS
179: #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS
180: #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
181: #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
182:
183: /*
184: * Structure of an inode on the disk
185: */
186: struct ext2_inode {
187: uint16_t i_mode; /* File mode */
188: uint16_t i_uid; /* Low 16 bits of Owner Uid */
189: uint32_t i_size; /* Size in bytes */
190: uint32_t i_atime; /* Access time */
191: uint32_t i_ctime; /* Creation time */
192: uint32_t i_mtime; /* Modification time */
193: uint32_t i_dtime; /* Deletion Time */
194: uint16_t i_gid; /* Low 16 bits of Group Id */
195: uint16_t i_links_count; /* Links count */
196: uint32_t i_blocks; /* Blocks count */
197: uint32_t i_flags; /* File flags */
198: union {
199: struct {
200: uint32_t l_i_reserved1;
201: } linux1;
202: struct {
203: uint32_t h_i_translator;
204: } hurd1;
205: struct {
206: uint32_t m_i_reserved1;
207: } masix1;
208: } osd1; /* OS dependent 1 */
209: uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
210: uint32_t i_generation; /* File version (for NFS) */
211: uint32_t i_file_acl; /* File ACL */
212: uint32_t i_dir_acl; /* Directory ACL */
213: uint32_t i_faddr; /* Fragment address */
214: union {
215: struct {
216: uint8_t l_i_frag; /* Fragment number */
217: uint8_t l_i_fsize; /* Fragment size */
218: uint16_t i_pad1;
219: uint16_t l_i_uid_high; /* these 2 fields */
220: uint16_t l_i_gid_high; /* were reserved2[0] */
221: uint32_t l_i_reserved2;
222: } linux2;
223: struct {
224: uint8_t h_i_frag; /* Fragment number */
225: uint8_t h_i_fsize; /* Fragment size */
226: uint16_t h_i_mode_high;
227: uint16_t h_i_uid_high;
228: uint16_t h_i_gid_high;
229: uint32_t h_i_author;
230: } hurd2;
231: struct {
232: uint8_t m_i_frag; /* Fragment number */
233: uint8_t m_i_fsize; /* Fragment size */
234: uint16_t m_pad1;
235: uint32_t m_i_reserved2[2];
236: } masix2;
237: } osd2; /* OS dependent 2 */
238: };
239:
240: #define i_size_high i_dir_acl
241:
242: #if defined(__KERNEL__) || defined(__linux__)
243: #define i_reserved1 osd1.linux1.l_i_reserved1
244: #define i_frag osd2.linux2.l_i_frag
245: #define i_fsize osd2.linux2.l_i_fsize
246: #define i_uid_low i_uid
247: #define i_gid_low i_gid
248: #define i_uid_high osd2.linux2.l_i_uid_high
249: #define i_gid_high osd2.linux2.l_i_gid_high
250: #define i_reserved2 osd2.linux2.l_i_reserved2
251: #endif
252:
253: #ifdef __hurd__
254: #define i_translator osd1.hurd1.h_i_translator
255: #define i_frag osd2.hurd2.h_i_frag;
256: #define i_fsize osd2.hurd2.h_i_fsize;
257: #define i_uid_high osd2.hurd2.h_i_uid_high
258: #define i_gid_high osd2.hurd2.h_i_gid_high
259: #define i_author osd2.hurd2.h_i_author
260: #endif
261:
262: #ifdef __masix__
263: #define i_reserved1 osd1.masix1.m_i_reserved1
264: #define i_frag osd2.masix2.m_i_frag
265: #define i_fsize osd2.masix2.m_i_fsize
266: #define i_reserved2 osd2.masix2.m_i_reserved2
267: #endif
268:
269: /*
270: * File system states
271: */
272: #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
273: #define EXT2_ERROR_FS 0x0002 /* Errors detected */
274:
275: /*
276: * Mount flags
277: */
278: #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */
279: #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
280: #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
281: #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
282: #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
283: #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
284: #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
285: #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
286: #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
287: #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
288: #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
289: #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
290: #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */
291: #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
292: #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
293: #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
294:
295:
296: #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
297: #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
298: #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
299: EXT2_MOUNT_##opt)
300: /*
301: * Maximal mount counts between two filesystem checks
302: */
303: #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
304: #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
305:
306: /*
307: * Behaviour when detecting errors
308: */
309: #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
310: #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
311: #define EXT2_ERRORS_PANIC 3 /* Panic */
312: #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
313:
314: /*
315: * Structure of the super block
316: */
317: struct ext2_super_block {
318: uint32_t s_inodes_count; /* Inodes count */
319: uint32_t s_blocks_count; /* Blocks count */
320: uint32_t s_r_blocks_count; /* Reserved blocks count */
321: uint32_t s_free_blocks_count; /* Free blocks count */
322: uint32_t s_free_inodes_count; /* Free inodes count */
323: uint32_t s_first_data_block; /* First Data Block */
324: uint32_t s_log_block_size; /* Block size */
325: uint32_t s_log_frag_size; /* Fragment size */
326: uint32_t s_blocks_per_group; /* # Blocks per group */
327: uint32_t s_frags_per_group; /* # Fragments per group */
328: uint32_t s_inodes_per_group; /* # Inodes per group */
329: uint32_t s_mtime; /* Mount time */
330: uint32_t s_wtime; /* Write time */
331: uint16_t s_mnt_count; /* Mount count */
332: uint16_t s_max_mnt_count; /* Maximal mount count */
333: uint16_t s_magic; /* Magic signature */
334: uint16_t s_state; /* File system state */
335: uint16_t s_errors; /* Behaviour when detecting errors */
336: uint16_t s_minor_rev_level; /* minor revision level */
337: uint32_t s_lastcheck; /* time of last check */
338: uint32_t s_checkinterval; /* max. time between checks */
339: uint32_t s_creator_os; /* OS */
340: uint32_t s_rev_level; /* Revision level */
341: uint16_t s_def_resuid; /* Default uid for reserved blocks */
342: uint16_t s_def_resgid; /* Default gid for reserved blocks */
343: /*
344: * These fields are for EXT2_DYNAMIC_REV superblocks only.
345: *
346: * Note: the difference between the compatible feature set and
347: * the incompatible feature set is that if there is a bit set
348: * in the incompatible feature set that the kernel doesn't
349: * know about, it should refuse to mount the filesystem.
350: *
351: * e2fsck's requirements are more strict; if it doesn't know
352: * about a feature in either the compatible or incompatible
353: * feature set, it must abort and not try to meddle with
354: * things it doesn't understand...
355: */
356: uint32_t s_first_ino; /* First non-reserved inode */
357: uint16_t s_inode_size; /* size of inode structure */
358: uint16_t s_block_group_nr; /* block group # of this superblock */
359: uint32_t s_feature_compat; /* compatible feature set */
360: uint32_t s_feature_incompat; /* incompatible feature set */
361: uint32_t s_feature_ro_compat; /* readonly-compatible feature set */
362: uint8_t s_uuid[16]; /* 128-bit uuid for volume */
363: char s_volume_name[16]; /* volume name */
364: char s_last_mounted[64]; /* directory where last mounted */
365: uint32_t s_algorithm_usage_bitmap; /* For compression */
366: /*
367: * Performance hints. Directory preallocation should only
368: * happen if the EXT2_COMPAT_PREALLOC flag is on.
369: */
370: uint8_t s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
371: uint8_t s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
372: uint16_t s_padding1;
373: /*
374: * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
375: */
376: uint8_t s_journal_uuid[16]; /* uuid of journal superblock */
377: uint32_t s_journal_inum; /* inode number of journal file */
378: uint32_t s_journal_dev; /* device number of journal file */
379: uint32_t s_last_orphan; /* start of list of inodes to delete */
380: uint32_t s_hash_seed[4]; /* HTREE hash seed */
381: uint8_t s_def_hash_version; /* Default hash version to use */
382: uint8_t s_reserved_char_pad;
383: uint16_t s_reserved_word_pad;
384: uint32_t s_default_mount_opts;
385: uint32_t s_first_meta_bg; /* First metablock block group */
386: uint32_t s_reserved[190]; /* Padding to the end of the block */
387: };
388:
389: /*
390: * Codes for operating systems
391: */
392: #define EXT2_OS_LINUX 0
393: #define EXT2_OS_HURD 1
394: #define EXT2_OS_MASIX 2
395: #define EXT2_OS_FREEBSD 3
396: #define EXT2_OS_LITES 4
397:
398: /*
399: * Revision levels
400: */
401: #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
402: #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
403:
404: #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
405: #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
406:
407: #define EXT2_GOOD_OLD_INODE_SIZE 128
408:
409: /*
410: * Feature set definitions
411: */
412:
413: #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
414: ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
415: #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
416: ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
417: #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
418: ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
419: #define EXT2_SET_COMPAT_FEATURE(sb,mask) \
420: EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
421: #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
422: EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
423: #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
424: EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
425: #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
426: EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
427: #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
428: EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
429: #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
430: EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
431:
432: #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
433: #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
434: #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
435: #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
436: #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
437: #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
438: #define EXT2_FEATURE_COMPAT_ANY 0xffffffff
439:
440: #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
441: #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
442: #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
443: #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
444:
445: #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
446: #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
447: #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
448: #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
449: #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
450: #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
451:
452: #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
453: #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
454: EXT2_FEATURE_INCOMPAT_META_BG)
455: #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
456: EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
457: EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
458: #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
459: #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
460:
461: /*
462: * Default values for user and/or group using reserved blocks
463: */
464: #define EXT2_DEF_RESUID 0
465: #define EXT2_DEF_RESGID 0
466:
467: /*
468: * Default mount options
469: */
470: #define EXT2_DEFM_DEBUG 0x0001
471: #define EXT2_DEFM_BSDGROUPS 0x0002
472: #define EXT2_DEFM_XATTR_USER 0x0004
473: #define EXT2_DEFM_ACL 0x0008
474: #define EXT2_DEFM_UID16 0x0010
475: /* Not used by ext2, but reserved for use by ext3 */
476: #define EXT3_DEFM_JMODE 0x0060
477: #define EXT3_DEFM_JMODE_DATA 0x0020
478: #define EXT3_DEFM_JMODE_ORDERED 0x0040
479: #define EXT3_DEFM_JMODE_WBACK 0x0060
480:
481: /*
482: * Structure of a directory entry
483: */
484: #define EXT2_NAME_LEN 255
485:
486: struct ext2_dir_entry {
487: uint32_t inode; /* Inode number */
488: uint16_t rec_len; /* Directory entry length */
489: uint16_t name_len; /* Name length */
490: char name[EXT2_NAME_LEN]; /* File name */
491: };
492:
493: /*
494: * The new version of the directory entry. Since EXT2 structures are
495: * stored in intel byte order, and the name_len field could never be
496: * bigger than 255 chars, it's safe to reclaim the extra byte for the
497: * file_type field.
498: */
499: struct ext2_dir_entry_2 {
500: uint32_t inode; /* Inode number */
501: uint16_t rec_len; /* Directory entry length */
502: uint8_t name_len; /* Name length */
503: uint8_t file_type;
504: char name[EXT2_NAME_LEN]; /* File name */
505: };
506:
507: /*
508: * Ext2 directory file types. Only the low 3 bits are used. The
509: * other bits are reserved for now.
510: */
511: enum {
512: EXT2_FT_UNKNOWN,
513: EXT2_FT_REG_FILE,
514: EXT2_FT_DIR,
515: EXT2_FT_CHRDEV,
516: EXT2_FT_BLKDEV,
517: EXT2_FT_FIFO,
518: EXT2_FT_SOCK,
519: EXT2_FT_SYMLINK,
520: EXT2_FT_MAX
521: };
522:
523: /*
524: * EXT2_DIR_PAD defines the directory entries boundaries
525: *
526: * NOTE: It must be a multiple of 4
527: */
528: #define EXT2_DIR_PAD 4
529: #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
530: #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
531: ~EXT2_DIR_ROUND)
532: #define EXT2_MAX_REC_LEN ((1<<16)-1)
533:
534: #endif /* _EXT2_FS_H */
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