2 * modified for EXT2FS support in Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
7 * $FreeBSD: src/sys/gnu/ext2fs/ext2_fs.h,v 1.8.2.2 2001/09/29 12:52:47 iedowse Exp $
10 * linux/include/linux/ext2_fs.h
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)
19 * linux/include/linux/minix_fs.h
21 * Copyright (C) 1991, 1992 Linus Torvalds
24 #ifndef _LINUX_EXT2_FS_H
25 #define _LINUX_EXT2_FS_H
27 #include <sys/types.h>
29 #define __u32 u_int32_t
31 #define __u16 u_int16_t
38 #define umode_t mode_t
41 /* the Linux implementation of EXT2 stores some information about
42 * an inode in a ext2_inode_info structure which is part of the incore
44 * I decided to use the "spare" fields instead - we'll see how this
48 #define i_block_group i_spare[0]
49 #define i_next_alloc_block i_spare[1]
50 #define i_next_alloc_goal i_spare[2]
51 #define i_prealloc_block i_din.di_spare[0]
52 #define i_prealloc_count i_din.di_spare[1]
55 * The second extended filesystem constants/structures
59 * Define EXT2FS_DEBUG to produce debug messages
64 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
66 #define EXT2_PREALLOCATE
67 #define EXT2_DEFAULT_PREALLOC_BLOCKS 8
70 * The second extended file system version
72 #define EXT2FS_DATE "95/08/09"
73 #define EXT2FS_VERSION "0.5b"
79 # define ext2_debug(f, a...) { \
80 printf ("EXT2-fs DEBUG (%s, %d): %s:", \
81 __FILE__, __LINE__, __FUNCTION__); \
85 # define ext2_debug(f, a...) /**/
89 * Special inodes numbers
91 #define EXT2_BAD_INO 1 /* Bad blocks inode */
92 #define EXT2_ROOT_INO 2 /* Root inode */
93 #define EXT2_ACL_IDX_INO 3 /* ACL inode */
94 #define EXT2_ACL_DATA_INO 4 /* ACL inode */
95 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
96 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
98 /* First non-reserved inode for old ext2 filesystems */
99 #define EXT2_GOOD_OLD_FIRST_INO 11
102 * The second extended file system magic number
104 #define EXT2_SUPER_MAGIC 0xEF53
107 * Maximal count of links to a file
109 #define EXT2_LINK_MAX 32000
112 * Note: under FreeBSD, the "user" versions of the following macros are
113 * used (and must be used) in most cases, because ((s)->u.ext2_sb.s_es is
114 * not accessible. This depends on __KERNEL__ not being defined for
115 * kernel builds under FreeBSD.
119 * Macro-instructions used to manage several block sizes
121 #define EXT2_MIN_BLOCK_SIZE 1024
122 #define EXT2_MAX_BLOCK_SIZE 4096
123 #define EXT2_MIN_BLOCK_LOG_SIZE 10
124 #if defined(__KERNEL__) || (defined(__FreeBSD__) && defined(_KERNEL))
125 # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
127 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
129 #define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
130 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
132 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
134 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
138 #define EXT2_ADDR_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_addr_per_block_bits)
139 #define EXT2_INODE_SIZE(s) ((s)->u.ext2_sb.s_inode_size)
140 #define EXT2_FIRST_INO(s) ((s)->u.ext2_sb.s_first_ino)
142 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
143 EXT2_GOOD_OLD_INODE_SIZE : \
145 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
146 EXT2_GOOD_OLD_FIRST_INO : \
150 #define EXT2_INODES_PER_BLOCK(s) ((s)->s_inodes_per_block)
151 /* Should be sizeof(struct ext2_inode): */
152 #define EXT2_INODE_SIZE 128
153 #define EXT2_FIRST_INO 11
157 * Macro-instructions used to manage fragments
159 #define EXT2_MIN_FRAG_SIZE 1024
160 #define EXT2_MAX_FRAG_SIZE 4096
161 #define EXT2_MIN_FRAG_LOG_SIZE 10
163 # define EXT2_FRAG_SIZE(s) ((s)->u.ext2_sb.s_frag_size)
164 # define EXT2_FRAGS_PER_BLOCK(s) ((s)->u.ext2_sb.s_frags_per_block)
166 # if defined(_KERNEL) && defined(__FreeBSD__)
167 # define EXT2_FRAG_SIZE(s) ((s)->s_frag_size)
169 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
171 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
177 struct ext2_acl_header /* Header of Access Control Lists */
180 __u32 aclh_file_count;
181 __u32 aclh_acle_count;
182 __u32 aclh_first_acle;
185 struct ext2_acl_entry /* Access Control List Entry */
188 __u16 acle_perms; /* Access permissions */
189 __u16 acle_type; /* Type of entry */
190 __u16 acle_tag; /* User or group identity */
192 __u32 acle_next; /* Pointer on next entry for the */
193 /* same inode or on next free entry */
197 * Structure of a blocks group descriptor
199 struct ext2_group_desc
201 __u32 bg_block_bitmap; /* Blocks bitmap block */
202 __u32 bg_inode_bitmap; /* Inodes bitmap block */
203 __u32 bg_inode_table; /* Inodes table block */
204 __u16 bg_free_blocks_count; /* Free blocks count */
205 __u16 bg_free_inodes_count; /* Free inodes count */
206 __u16 bg_used_dirs_count; /* Directories count */
208 __u32 bg_reserved[3];
212 * Macro-instructions used to manage group descriptors
215 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->u.ext2_sb.s_blocks_per_group)
216 # define EXT2_DESC_PER_BLOCK(s) ((s)->u.ext2_sb.s_desc_per_block)
217 # define EXT2_INODES_PER_GROUP(s) ((s)->u.ext2_sb.s_inodes_per_group)
218 # define EXT2_DESC_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_desc_per_block_bits)
220 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
221 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
222 # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
226 * Constants relative to the data blocks
228 #define EXT2_NDIR_BLOCKS 12
229 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
230 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
231 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
232 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
233 #define EXT2_MAXSYMLINKLEN (EXT2_N_BLOCKS * sizeof (__u32))
238 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
239 #define EXT2_UNRM_FL 0x00000002 /* Undelete */
240 #define EXT2_COMPR_FL 0x00000004 /* Compress file */
241 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
242 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
243 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
244 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
245 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
246 /* Reserved for compression usage... */
247 #define EXT2_DIRTY_FL 0x00000100
248 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
249 #define EXT2_NOCOMP_FL 0x00000400 /* Don't compress */
250 #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
251 /* End compression flags --- maybe not all used */
252 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */
253 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
255 #define EXT2_FL_USER_VISIBLE 0x00001FFF /* User visible flags */
256 #define EXT2_FL_USER_MODIFIABLE 0x000000FF /* User modifiable flags */
261 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
262 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
263 #define EXT2_IOC_GETVERSION _IOR('v', 1, long)
264 #define EXT2_IOC_SETVERSION _IOW('v', 2, long)
267 * Only declare `struct ext2_inode' if <ufs/ufs/inode.h> hasn't made things
268 * difficult by #defining i_mode and other struct members. The details of
269 * the struct are only needed in ext2_inode_cnv.c where the ext2fs on-disk
270 * inode is converted to a ufs in-core inode.
275 * Structure of an inode on the disk
278 __u16 i_mode; /* File mode */
279 __u16 i_uid; /* Owner Uid */
280 __u32 i_size; /* Size in bytes */
281 __u32 i_atime; /* Access time */
282 __u32 i_ctime; /* Creation time */
283 __u32 i_mtime; /* Modification time */
284 __u32 i_dtime; /* Deletion Time */
285 __u16 i_gid; /* Group Id */
286 __u16 i_links_count; /* Links count */
287 __u32 i_blocks; /* Blocks count */
288 __u32 i_flags; /* File flags */
294 __u32 h_i_translator;
299 } osd1; /* OS dependent 1 */
300 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
301 __u32 i_generation; /* File version (for NFS) */
302 __u32 i_file_acl; /* File ACL */
303 __u32 i_dir_acl; /* Directory ACL */
304 __u32 i_faddr; /* Fragment address */
307 __u8 l_i_frag; /* Fragment number */
308 __u8 l_i_fsize; /* Fragment size */
310 __u32 l_i_reserved2[2];
313 __u8 h_i_frag; /* Fragment number */
314 __u8 h_i_fsize; /* Fragment size */
321 __u8 m_i_frag; /* Fragment number */
322 __u8 m_i_fsize; /* Fragment size */
324 __u32 m_i_reserved2[2];
326 } osd2; /* OS dependent 2 */
329 #define i_size_high i_dir_acl
331 #if defined(__KERNEL__) || defined(__linux__)
332 #define i_reserved1 osd1.linux1.l_i_reserved1
333 #define i_frag osd2.linux2.l_i_frag
334 #define i_fsize osd2.linux2.l_i_fsize
335 #define i_reserved2 osd2.linux2.l_i_reserved2
339 #define i_translator osd1.hurd1.h_i_translator
340 #define i_frag osd2.hurd2.h_i_frag;
341 #define i_fsize osd2.hurd2.h_i_fsize;
342 #define i_uid_high osd2.hurd2.h_i_uid_high
343 #define i_gid_high osd2.hurd2.h_i_gid_high
344 #define i_author osd2.hurd2.h_i_author
348 #define i_reserved1 osd1.masix1.m_i_reserved1
349 #define i_frag osd2.masix2.m_i_frag
350 #define i_fsize osd2.masix2.m_i_fsize
351 #define i_reserved2 osd2.masix2.m_i_reserved2
359 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
360 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
365 #define EXT2_MOUNT_CHECK_NORMAL 0x0001 /* Do some more checks */
366 #define EXT2_MOUNT_CHECK_STRICT 0x0002 /* Do again more checks */
367 #define EXT2_MOUNT_CHECK (EXT2_MOUNT_CHECK_NORMAL | \
368 EXT2_MOUNT_CHECK_STRICT)
369 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
370 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
371 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
372 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
373 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
374 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
376 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
377 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
378 #define test_opt(sb, opt) ((sb)->u.ext2_sb.s_mount_opt & \
381 * Maximal mount counts between two filesystem checks
383 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
384 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
387 * Behaviour when detecting errors
389 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
390 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
391 #define EXT2_ERRORS_PANIC 3 /* Panic */
392 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
395 * Structure of the super block
397 struct ext2_super_block {
398 __u32 s_inodes_count; /* Inodes count */
399 __u32 s_blocks_count; /* Blocks count */
400 __u32 s_r_blocks_count; /* Reserved blocks count */
401 __u32 s_free_blocks_count; /* Free blocks count */
402 __u32 s_free_inodes_count; /* Free inodes count */
403 __u32 s_first_data_block; /* First Data Block */
404 __u32 s_log_block_size; /* Block size */
405 __s32 s_log_frag_size; /* Fragment size */
406 __u32 s_blocks_per_group; /* # Blocks per group */
407 __u32 s_frags_per_group; /* # Fragments per group */
408 __u32 s_inodes_per_group; /* # Inodes per group */
409 __u32 s_mtime; /* Mount time */
410 __u32 s_wtime; /* Write time */
411 __u16 s_mnt_count; /* Mount count */
412 __s16 s_max_mnt_count; /* Maximal mount count */
413 __u16 s_magic; /* Magic signature */
414 __u16 s_state; /* File system state */
415 __u16 s_errors; /* Behaviour when detecting errors */
416 __u16 s_minor_rev_level; /* minor revision level */
417 __u32 s_lastcheck; /* time of last check */
418 __u32 s_checkinterval; /* max. time between checks */
419 __u32 s_creator_os; /* OS */
420 __u32 s_rev_level; /* Revision level */
421 __u16 s_def_resuid; /* Default uid for reserved blocks */
422 __u16 s_def_resgid; /* Default gid for reserved blocks */
424 * These fields are for EXT2_DYNAMIC_REV superblocks only.
426 * Note: the difference between the compatible feature set and
427 * the incompatible feature set is that if there is a bit set
428 * in the incompatible feature set that the kernel doesn't
429 * know about, it should refuse to mount the filesystem.
431 * e2fsck's requirements are more strict; if it doesn't know
432 * about a feature in either the compatible or incompatible
433 * feature set, it must abort and not try to meddle with
434 * things it doesn't understand...
436 __u32 s_first_ino; /* First non-reserved inode */
437 __u16 s_inode_size; /* size of inode structure */
438 __u16 s_block_group_nr; /* block group # of this superblock */
439 __u32 s_feature_compat; /* compatible feature set */
440 __u32 s_feature_incompat; /* incompatible feature set */
441 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
442 __u8 s_uuid[16]; /* 128-bit uuid for volume */
443 char s_volume_name[16]; /* volume name */
444 char s_last_mounted[64]; /* directory where last mounted */
445 __u32 s_algorithm_usage_bitmap; /* For compression */
447 * Performance hints. Directory preallocation should only
448 * happen if the EXT2_COMPAT_PREALLOC flag is on.
450 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
451 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
453 __u32 s_reserved[204]; /* Padding to the end of the block */
457 #define EXT2_SB(sb) (&((sb)->u.ext2_sb))
459 /* Assume that user mode programs are passing in an ext2fs superblock, not
460 * a kernel struct super_block. This will allow us to call the feature-test
461 * macros from user land. */
462 #define EXT2_SB(sb) (sb)
466 * Codes for operating systems
468 #define EXT2_OS_LINUX 0
469 #define EXT2_OS_HURD 1
470 #define EXT2_OS_MASIX 2
471 #define EXT2_OS_FREEBSD 3
472 #define EXT2_OS_LITES 4
477 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
478 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
480 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
481 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
483 #define EXT2_GOOD_OLD_INODE_SIZE 128
486 * Feature set definitions
489 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
490 ( EXT2_SB(sb)->s_feature_compat & (mask) )
491 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
492 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
493 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
494 ( EXT2_SB(sb)->s_feature_incompat & (mask) )
496 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
498 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
499 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
500 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
502 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
503 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
505 #define EXT2_FEATURE_COMPAT_SUPP 0
506 #define EXT2_FEATURE_INCOMPAT_SUPP EXT2_FEATURE_INCOMPAT_FILETYPE
508 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
509 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
510 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
512 #define EXT2_FEATURE_RO_COMPAT_SUPP EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
516 * Default values for user and/or group using reserved blocks
518 #define EXT2_DEF_RESUID 0
519 #define EXT2_DEF_RESGID 0
522 * Structure of a directory entry
524 #define EXT2_NAME_LEN 255
526 struct ext2_dir_entry {
527 __u32 inode; /* Inode number */
528 __u16 rec_len; /* Directory entry length */
529 __u16 name_len; /* Name length */
530 char name[EXT2_NAME_LEN]; /* File name */
534 * The new version of the directory entry. Since EXT2 structures are
535 * stored in intel byte order, and the name_len field could never be
536 * bigger than 255 chars, it's safe to reclaim the extra byte for the
539 struct ext2_dir_entry_2 {
540 __u32 inode; /* Inode number */
541 __u16 rec_len; /* Directory entry length */
542 __u8 name_len; /* Name length */
544 char name[EXT2_NAME_LEN]; /* File name */
548 * Ext2 directory file types. Only the low 3 bits are used. The
549 * other bits are reserved for now.
551 #define EXT2_FT_UNKNOWN 0
552 #define EXT2_FT_REG_FILE 1
553 #define EXT2_FT_DIR 2
554 #define EXT2_FT_CHRDEV 3
555 #define EXT2_FT_BLKDEV 4
556 #define EXT2_FT_FIFO 5
557 #define EXT2_FT_SOCK 6
558 #define EXT2_FT_SYMLINK 7
560 #define EXT2_FT_MAX 8
563 * EXT2_DIR_PAD defines the directory entries boundaries
565 * NOTE: It must be a multiple of 4
567 #define EXT2_DIR_PAD 4
568 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
569 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
572 #endif /* _LINUX_EXT2_FS_H */