2 * linux/include/linux/ext3_fs.h
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)
11 * linux/include/linux/minix_fs.h
13 * Copyright (C) 1991, 1992 Linus Torvalds
16 #ifndef _LINUX_EXT3_FS_H
17 #define _LINUX_EXT3_FS_H
19 #include <linux/types.h>
20 #include <linux/ext3_fs_i.h>
21 #include <linux/ext3_fs_sb.h>
27 * The second extended filesystem constants/structures
31 * Define EXT3FS_DEBUG to produce debug messages
36 * Define EXT3_PREALLOCATE to preallocate data blocks for expanding files
38 #undef EXT3_PREALLOCATE /* @@@ Fix this! */
39 #define EXT3_DEFAULT_PREALLOC_BLOCKS 8
42 * Always enable hashed directories
44 #define CONFIG_EXT3_INDEX
50 #define ext3_debug(f, a...) \
52 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:", \
53 __FILE__, __LINE__, __FUNCTION__); \
54 printk (KERN_DEBUG f, ## a); \
57 #define ext3_debug(f, a...) do {} while (0)
61 * Special inodes numbers
63 #define EXT3_BAD_INO 1 /* Bad blocks inode */
64 #define EXT3_ROOT_INO 2 /* Root inode */
65 #define EXT3_BOOT_LOADER_INO 5 /* Boot loader inode */
66 #define EXT3_UNDEL_DIR_INO 6 /* Undelete directory inode */
67 #define EXT3_RESIZE_INO 7 /* Reserved group descriptors inode */
68 #define EXT3_JOURNAL_INO 8 /* Journal inode */
70 /* First non-reserved inode for old ext3 filesystems */
71 #define EXT3_GOOD_OLD_FIRST_INO 11
74 * The second extended file system magic number
76 #define EXT3_SUPER_MAGIC 0xEF53
79 * Maximal count of links to a file
81 #define EXT3_LINK_MAX 32000
84 * Macro-instructions used to manage several block sizes
86 #define EXT3_MIN_BLOCK_SIZE 1024
87 #define EXT3_MAX_BLOCK_SIZE 4096
88 #define EXT3_MIN_BLOCK_LOG_SIZE 10
90 # define EXT3_BLOCK_SIZE(s) ((s)->s_blocksize)
92 # define EXT3_BLOCK_SIZE(s) (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
94 #define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
96 # define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
98 # define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
101 #define EXT3_ADDR_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_addr_per_block_bits)
102 #define EXT3_INODE_SIZE(s) (EXT3_SB(s)->s_inode_size)
103 #define EXT3_FIRST_INO(s) (EXT3_SB(s)->s_first_ino)
105 #define EXT3_INODE_SIZE(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
106 EXT3_GOOD_OLD_INODE_SIZE : \
108 #define EXT3_FIRST_INO(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
109 EXT3_GOOD_OLD_FIRST_INO : \
114 * Macro-instructions used to manage fragments
116 #define EXT3_MIN_FRAG_SIZE 1024
117 #define EXT3_MAX_FRAG_SIZE 4096
118 #define EXT3_MIN_FRAG_LOG_SIZE 10
120 # define EXT3_FRAG_SIZE(s) (EXT3_SB(s)->s_frag_size)
121 # define EXT3_FRAGS_PER_BLOCK(s) (EXT3_SB(s)->s_frags_per_block)
123 # define EXT3_FRAG_SIZE(s) (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
124 # define EXT3_FRAGS_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
128 * Structure of a blocks group descriptor
130 struct ext3_group_desc
132 __u32 bg_block_bitmap; /* Blocks bitmap block */
133 __u32 bg_inode_bitmap; /* Inodes bitmap block */
134 __u32 bg_inode_table; /* Inodes table block */
135 __u16 bg_free_blocks_count; /* Free blocks count */
136 __u16 bg_free_inodes_count; /* Free inodes count */
137 __u16 bg_used_dirs_count; /* Directories count */
139 __u32 bg_reserved[3];
143 * Macro-instructions used to manage group descriptors
146 # define EXT3_BLOCKS_PER_GROUP(s) (EXT3_SB(s)->s_blocks_per_group)
147 # define EXT3_DESC_PER_BLOCK(s) (EXT3_SB(s)->s_desc_per_block)
148 # define EXT3_INODES_PER_GROUP(s) (EXT3_SB(s)->s_inodes_per_group)
149 # define EXT3_DESC_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_desc_per_block_bits)
151 # define EXT3_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
152 # define EXT3_DESC_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
153 # define EXT3_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
157 * Constants relative to the data blocks
159 #define EXT3_NDIR_BLOCKS 12
160 #define EXT3_IND_BLOCK EXT3_NDIR_BLOCKS
161 #define EXT3_DIND_BLOCK (EXT3_IND_BLOCK + 1)
162 #define EXT3_TIND_BLOCK (EXT3_DIND_BLOCK + 1)
163 #define EXT3_N_BLOCKS (EXT3_TIND_BLOCK + 1)
168 #define EXT3_SECRM_FL 0x00000001 /* Secure deletion */
169 #define EXT3_UNRM_FL 0x00000002 /* Undelete */
170 #define EXT3_COMPR_FL 0x00000004 /* Compress file */
171 #define EXT3_SYNC_FL 0x00000008 /* Synchronous updates */
172 #define EXT3_IMMUTABLE_FL 0x00000010 /* Immutable file */
173 #define EXT3_APPEND_FL 0x00000020 /* writes to file may only append */
174 #define EXT3_NODUMP_FL 0x00000040 /* do not dump file */
175 #define EXT3_NOATIME_FL 0x00000080 /* do not update atime */
176 /* Reserved for compression usage... */
177 #define EXT3_DIRTY_FL 0x00000100
178 #define EXT3_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
179 #define EXT3_NOCOMPR_FL 0x00000400 /* Don't compress */
180 #define EXT3_ECOMPR_FL 0x00000800 /* Compression error */
181 /* End compression flags --- maybe not all used */
182 #define EXT3_INDEX_FL 0x00001000 /* hash-indexed directory */
183 #define EXT3_IMAGIC_FL 0x00002000 /* AFS directory */
184 #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
185 #define EXT3_NOTAIL_FL 0x00008000 /* file tail should not be merged */
186 #define EXT3_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
187 #define EXT3_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
188 #define EXT3_BARRIER_FL 0x04000000 /* Barrier for chroot() */
189 #define EXT3_IUNLINK_FL 0x08000000 /* Immutable unlink */
190 #define EXT3_RESERVED_FL 0x80000000 /* reserved for ext3 lib */
192 #ifdef CONFIG_VSERVER_LEGACY
193 #define EXT3_FL_USER_VISIBLE 0x0C03DFFF /* User visible flags */
194 #define EXT3_FL_USER_MODIFIABLE 0x0C0380FF /* User modifiable flags */
196 #define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
197 #define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
201 * Inode dynamic state flags
203 #define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */
204 #define EXT3_STATE_NEW 0x00000002 /* inode is newly created */
209 #define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
210 #define EXT3_IOC_SETFLAGS _IOW('f', 2, long)
211 #define EXT3_IOC_GETVERSION _IOR('f', 3, long)
212 #define EXT3_IOC_SETVERSION _IOW('f', 4, long)
213 #define EXT3_IOC_GETVERSION_OLD _IOR('v', 1, long)
214 #define EXT3_IOC_SETVERSION_OLD _IOW('v', 2, long)
215 #ifdef CONFIG_JBD_DEBUG
216 #define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
218 #ifdef CONFIG_VSERVER_LEGACY
219 #define EXT3_IOC_SETXID FIOC_SETXIDJ
223 * Structure of an inode on the disk
226 __u16 i_mode; /* File mode */
227 __u16 i_uid; /* Low 16 bits of Owner Uid */
228 __u32 i_size; /* Size in bytes */
229 __u32 i_atime; /* Access time */
230 __u32 i_ctime; /* Creation time */
231 __u32 i_mtime; /* Modification time */
232 __u32 i_dtime; /* Deletion Time */
233 __u16 i_gid; /* Low 16 bits of Group Id */
234 __u16 i_links_count; /* Links count */
235 __u32 i_blocks; /* Blocks count */
236 __u32 i_flags; /* File flags */
242 __u32 h_i_translator;
247 } osd1; /* OS dependent 1 */
248 __u32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
249 __u32 i_generation; /* File version (for NFS) */
250 __u32 i_file_acl; /* File ACL */
251 __u32 i_dir_acl; /* Directory ACL */
252 __u32 i_faddr; /* Fragment address */
255 __u8 l_i_frag; /* Fragment number */
256 __u8 l_i_fsize; /* Fragment size */
257 __u16 l_i_xid; /* LRU Context */
258 __u16 l_i_uid_high; /* these 2 fields */
259 __u16 l_i_gid_high; /* were reserved2[0] */
263 __u8 h_i_frag; /* Fragment number */
264 __u8 h_i_fsize; /* Fragment size */
271 __u8 m_i_frag; /* Fragment number */
272 __u8 m_i_fsize; /* Fragment size */
274 __u32 m_i_reserved2[2];
276 } osd2; /* OS dependent 2 */
279 #define i_size_high i_dir_acl
281 #if defined(__KERNEL__) || defined(__linux__)
282 #define i_reserved1 osd1.linux1.l_i_reserved1
283 #define i_frag osd2.linux2.l_i_frag
284 #define i_fsize osd2.linux2.l_i_fsize
285 #define i_uid_low i_uid
286 #define i_gid_low i_gid
287 #define i_uid_high osd2.linux2.l_i_uid_high
288 #define i_gid_high osd2.linux2.l_i_gid_high
289 #define i_raw_xid osd2.linux2.l_i_xid
290 #define i_reserved2 osd2.linux2.l_i_reserved2
292 #elif defined(__GNU__)
294 #define i_translator osd1.hurd1.h_i_translator
295 #define i_frag osd2.hurd2.h_i_frag;
296 #define i_fsize osd2.hurd2.h_i_fsize;
297 #define i_uid_high osd2.hurd2.h_i_uid_high
298 #define i_gid_high osd2.hurd2.h_i_gid_high
299 #define i_author osd2.hurd2.h_i_author
301 #elif defined(__masix__)
303 #define i_reserved1 osd1.masix1.m_i_reserved1
304 #define i_frag osd2.masix2.m_i_frag
305 #define i_fsize osd2.masix2.m_i_fsize
306 #define i_reserved2 osd2.masix2.m_i_reserved2
308 #endif /* defined(__KERNEL__) || defined(__linux__) */
313 #define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
314 #define EXT3_ERROR_FS 0x0002 /* Errors detected */
315 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
320 #define EXT3_MOUNT_CHECK 0x0001 /* Do mount-time checks */
321 #define EXT3_MOUNT_OLDALLOC 0x0002 /* Don't use the new Orlov allocator */
322 #define EXT3_MOUNT_GRPID 0x0004 /* Create files with directory's group */
323 #define EXT3_MOUNT_DEBUG 0x0008 /* Some debugging messages */
324 #define EXT3_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
325 #define EXT3_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
326 #define EXT3_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
327 #define EXT3_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
328 #define EXT3_MOUNT_NOLOAD 0x0100 /* Don't use existing journal*/
329 #define EXT3_MOUNT_ABORT 0x0200 /* Fatal error detected */
330 #define EXT3_MOUNT_DATA_FLAGS 0x0C00 /* Mode for data writes: */
331 #define EXT3_MOUNT_JOURNAL_DATA 0x0400 /* Write data to journal */
332 #define EXT3_MOUNT_ORDERED_DATA 0x0800 /* Flush data before commit */
333 #define EXT3_MOUNT_WRITEBACK_DATA 0x0C00 /* No data ordering */
334 #define EXT3_MOUNT_UPDATE_JOURNAL 0x1000 /* Update the journal format */
335 #define EXT3_MOUNT_NO_UID32 0x2000 /* Disable 32-bit UIDs */
336 #define EXT3_MOUNT_XATTR_USER 0x4000 /* Extended user attributes */
337 #define EXT3_MOUNT_POSIX_ACL 0x8000 /* POSIX Access Control Lists */
338 #define EXT3_MOUNT_TAG_XID 0x20000 /* Enable Context Tags */
340 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
341 #ifndef _LINUX_EXT2_FS_H
342 #define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
343 #define set_opt(o, opt) o |= EXT3_MOUNT_##opt
344 #define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
347 #define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
348 #define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
349 #define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
352 #define ext3_set_bit ext2_set_bit
353 #define ext3_set_bit_atomic ext2_set_bit_atomic
354 #define ext3_clear_bit ext2_clear_bit
355 #define ext3_clear_bit_atomic ext2_clear_bit_atomic
356 #define ext3_test_bit ext2_test_bit
357 #define ext3_find_first_zero_bit ext2_find_first_zero_bit
358 #define ext3_find_next_zero_bit ext2_find_next_zero_bit
361 * Maximal mount counts between two filesystem checks
363 #define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
364 #define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
367 * Behaviour when detecting errors
369 #define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
370 #define EXT3_ERRORS_RO 2 /* Remount fs read-only */
371 #define EXT3_ERRORS_PANIC 3 /* Panic */
372 #define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
375 * Structure of the super block
377 struct ext3_super_block {
378 /*00*/ __u32 s_inodes_count; /* Inodes count */
379 __u32 s_blocks_count; /* Blocks count */
380 __u32 s_r_blocks_count; /* Reserved blocks count */
381 __u32 s_free_blocks_count; /* Free blocks count */
382 /*10*/ __u32 s_free_inodes_count; /* Free inodes count */
383 __u32 s_first_data_block; /* First Data Block */
384 __u32 s_log_block_size; /* Block size */
385 __s32 s_log_frag_size; /* Fragment size */
386 /*20*/ __u32 s_blocks_per_group; /* # Blocks per group */
387 __u32 s_frags_per_group; /* # Fragments per group */
388 __u32 s_inodes_per_group; /* # Inodes per group */
389 __u32 s_mtime; /* Mount time */
390 /*30*/ __u32 s_wtime; /* Write time */
391 __u16 s_mnt_count; /* Mount count */
392 __s16 s_max_mnt_count; /* Maximal mount count */
393 __u16 s_magic; /* Magic signature */
394 __u16 s_state; /* File system state */
395 __u16 s_errors; /* Behaviour when detecting errors */
396 __u16 s_minor_rev_level; /* minor revision level */
397 /*40*/ __u32 s_lastcheck; /* time of last check */
398 __u32 s_checkinterval; /* max. time between checks */
399 __u32 s_creator_os; /* OS */
400 __u32 s_rev_level; /* Revision level */
401 /*50*/ __u16 s_def_resuid; /* Default uid for reserved blocks */
402 __u16 s_def_resgid; /* Default gid for reserved blocks */
404 * These fields are for EXT3_DYNAMIC_REV superblocks only.
406 * Note: the difference between the compatible feature set and
407 * the incompatible feature set is that if there is a bit set
408 * in the incompatible feature set that the kernel doesn't
409 * know about, it should refuse to mount the filesystem.
411 * e2fsck's requirements are more strict; if it doesn't know
412 * about a feature in either the compatible or incompatible
413 * feature set, it must abort and not try to meddle with
414 * things it doesn't understand...
416 __u32 s_first_ino; /* First non-reserved inode */
417 __u16 s_inode_size; /* size of inode structure */
418 __u16 s_block_group_nr; /* block group # of this superblock */
419 __u32 s_feature_compat; /* compatible feature set */
420 /*60*/ __u32 s_feature_incompat; /* incompatible feature set */
421 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
422 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
423 /*78*/ char s_volume_name[16]; /* volume name */
424 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
425 /*C8*/ __u32 s_algorithm_usage_bitmap; /* For compression */
427 * Performance hints. Directory preallocation should only
428 * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
430 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
431 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
434 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
436 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
437 /*E0*/ __u32 s_journal_inum; /* inode number of journal file */
438 __u32 s_journal_dev; /* device number of journal file */
439 __u32 s_last_orphan; /* start of list of inodes to delete */
440 __u32 s_hash_seed[4]; /* HTREE hash seed */
441 __u8 s_def_hash_version; /* Default hash version to use */
442 __u8 s_reserved_char_pad;
443 __u16 s_reserved_word_pad;
444 __u32 s_default_mount_opts;
445 __u32 s_first_meta_bg; /* First metablock block group */
446 __u32 s_reserved[190]; /* Padding to the end of the block */
450 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
452 return sb->s_fs_info;
454 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
456 return container_of(inode, struct ext3_inode_info, vfs_inode);
459 /* Assume that user mode programs are passing in an ext3fs superblock, not
460 * a kernel struct super_block. This will allow us to call the feature-test
461 * macros from user land. */
462 #define EXT3_SB(sb) (sb)
465 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
468 * Codes for operating systems
470 #define EXT3_OS_LINUX 0
471 #define EXT3_OS_HURD 1
472 #define EXT3_OS_MASIX 2
473 #define EXT3_OS_FREEBSD 3
474 #define EXT3_OS_LITES 4
479 #define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
480 #define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
482 #define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
483 #define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
485 #define EXT3_GOOD_OLD_INODE_SIZE 128
488 * Feature set definitions
491 #define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
492 ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
493 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
494 ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
495 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
496 ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
497 #define EXT3_SET_COMPAT_FEATURE(sb,mask) \
498 EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
499 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
500 EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
501 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
502 EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
503 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
504 EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
505 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
506 EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
507 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
508 EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
510 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
511 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
512 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
513 #define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
514 #define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
515 #define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
517 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
518 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
519 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
521 #define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
522 #define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
523 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
524 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
525 #define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
527 #define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
528 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \
529 EXT3_FEATURE_INCOMPAT_RECOVER| \
530 EXT3_FEATURE_INCOMPAT_META_BG)
531 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
532 EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
533 EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
536 * Default values for user and/or group using reserved blocks
538 #define EXT3_DEF_RESUID 0
539 #define EXT3_DEF_RESGID 0
542 * Default mount options
544 #define EXT3_DEFM_DEBUG 0x0001
545 #define EXT3_DEFM_BSDGROUPS 0x0002
546 #define EXT3_DEFM_XATTR_USER 0x0004
547 #define EXT3_DEFM_ACL 0x0008
548 #define EXT3_DEFM_UID16 0x0010
549 #define EXT3_DEFM_JMODE 0x0060
550 #define EXT3_DEFM_JMODE_DATA 0x0020
551 #define EXT3_DEFM_JMODE_ORDERED 0x0040
552 #define EXT3_DEFM_JMODE_WBACK 0x0060
555 * Structure of a directory entry
557 #define EXT3_NAME_LEN 255
559 struct ext3_dir_entry {
560 __u32 inode; /* Inode number */
561 __u16 rec_len; /* Directory entry length */
562 __u16 name_len; /* Name length */
563 char name[EXT3_NAME_LEN]; /* File name */
567 * The new version of the directory entry. Since EXT3 structures are
568 * stored in intel byte order, and the name_len field could never be
569 * bigger than 255 chars, it's safe to reclaim the extra byte for the
572 struct ext3_dir_entry_2 {
573 __u32 inode; /* Inode number */
574 __u16 rec_len; /* Directory entry length */
575 __u8 name_len; /* Name length */
577 char name[EXT3_NAME_LEN]; /* File name */
581 * Ext3 directory file types. Only the low 3 bits are used. The
582 * other bits are reserved for now.
584 #define EXT3_FT_UNKNOWN 0
585 #define EXT3_FT_REG_FILE 1
586 #define EXT3_FT_DIR 2
587 #define EXT3_FT_CHRDEV 3
588 #define EXT3_FT_BLKDEV 4
589 #define EXT3_FT_FIFO 5
590 #define EXT3_FT_SOCK 6
591 #define EXT3_FT_SYMLINK 7
593 #define EXT3_FT_MAX 8
596 * EXT3_DIR_PAD defines the directory entries boundaries
598 * NOTE: It must be a multiple of 4
600 #define EXT3_DIR_PAD 4
601 #define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
602 #define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
605 * Hash Tree Directory indexing
606 * (c) Daniel Phillips, 2001
609 #ifdef CONFIG_EXT3_INDEX
610 #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
611 EXT3_FEATURE_COMPAT_DIR_INDEX) && \
612 (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
613 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
614 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
617 #define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
618 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
621 /* Legal values for the dx_root hash_version field: */
623 #define DX_HASH_LEGACY 0
624 #define DX_HASH_HALF_MD4 1
625 #define DX_HASH_TEA 2
627 /* hash info structure used by the directory hash */
636 #define EXT3_HTREE_EOF 0x7fffffff
640 * Control parameters used by ext3_htree_next_block
642 #define HASH_NB_ALWAYS 1
646 * Describe an inode's exact location on disk and in memory
650 struct buffer_head *bh;
651 unsigned long offset;
652 unsigned long block_group;
655 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
657 return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
661 * This structure is stuffed into the struct file's private_data field
662 * for directories. It is where we put information so that we can do
663 * readdir operations in hash tree order.
665 struct dir_private_info {
667 struct rb_node *curr_node;
668 struct fname *extra_fname;
671 __u32 curr_minor_hash;
676 * Special error return code only used by dx_probe() and its callers.
678 #define ERR_BAD_DX_DIR -75000
681 * Function prototypes
685 * Ok, these declarations are also in <linux/kernel.h> but none of the
686 * ext3 source programs needs to include it so they are duplicated here.
688 # define NORET_TYPE /**/
689 # define ATTRIB_NORET __attribute__((noreturn))
690 # define NORET_AND noreturn,
693 extern int ext3_bg_has_super(struct super_block *sb, int group);
694 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
695 extern int ext3_new_block (handle_t *, struct inode *, unsigned long,
696 __u32 *, __u32 *, int *);
697 extern void ext3_free_blocks (handle_t *, struct inode *, unsigned long,
699 extern unsigned long ext3_count_free_blocks (struct super_block *);
700 extern void ext3_check_blocks_bitmap (struct super_block *);
701 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
702 unsigned int block_group,
703 struct buffer_head ** bh);
704 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
707 extern int ext3_check_dir_entry(const char *, struct inode *,
708 struct ext3_dir_entry_2 *,
709 struct buffer_head *, unsigned long);
710 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
712 struct ext3_dir_entry_2 *dirent);
713 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
716 extern int ext3_sync_file (struct file *, struct dentry *, int);
719 extern int ext3fs_dirhash(const char *name, int len, struct
720 dx_hash_info *hinfo);
723 extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
724 extern void ext3_free_inode (handle_t *, struct inode *);
725 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
726 extern unsigned long ext3_count_free_inodes (struct super_block *);
727 extern unsigned long ext3_count_dirs (struct super_block *);
728 extern void ext3_check_inodes_bitmap (struct super_block *);
729 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
733 extern int ext3_forget(handle_t *, int, struct inode *, struct buffer_head *, int);
734 extern struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
735 extern struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
737 extern void ext3_read_inode (struct inode *);
738 extern void ext3_write_inode (struct inode *, int);
739 extern int ext3_setattr (struct dentry *, struct iattr *);
740 extern void ext3_put_inode (struct inode *);
741 extern void ext3_delete_inode (struct inode *);
742 extern int ext3_sync_inode (handle_t *, struct inode *);
743 extern void ext3_discard_prealloc (struct inode *);
744 extern void ext3_dirty_inode(struct inode *);
745 extern int ext3_change_inode_journal_flag(struct inode *, int);
746 extern void ext3_truncate (struct inode *);
747 extern void ext3_set_inode_flags(struct inode *);
748 extern void ext3_set_aops(struct inode *inode);
751 extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
755 extern int ext3_orphan_add(handle_t *, struct inode *);
756 extern int ext3_orphan_del(handle_t *, struct inode *);
757 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
758 __u32 start_minor_hash, __u32 *next_hash);
761 extern void ext3_error (struct super_block *, const char *, const char *, ...)
762 __attribute__ ((format (printf, 3, 4)));
763 extern void __ext3_std_error (struct super_block *, const char *, int);
764 extern void ext3_abort (struct super_block *, const char *, const char *, ...)
765 __attribute__ ((format (printf, 3, 4)));
766 extern NORET_TYPE void ext3_panic (struct super_block *, const char *,
768 __attribute__ ((NORET_AND format (printf, 3, 4)));
769 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
770 __attribute__ ((format (printf, 3, 4)));
771 extern void ext3_update_dynamic_rev (struct super_block *sb);
772 extern void ext3_put_super (struct super_block *);
773 extern void ext3_write_super (struct super_block *);
774 extern void ext3_write_super_lockfs (struct super_block *);
775 extern void ext3_unlockfs (struct super_block *);
776 extern int ext3_remount (struct super_block *, int *, char *);
777 extern int ext3_statfs (struct super_block *, struct kstatfs *);
779 #define ext3_std_error(sb, errno) \
782 __ext3_std_error((sb), __FUNCTION__, (errno)); \
784 extern const char *ext3_decode_error(struct super_block *sb, int errno, char nbuf[16]);
787 * Inodes and files operations
791 extern struct file_operations ext3_dir_operations;
794 extern struct inode_operations ext3_file_inode_operations;
795 extern struct file_operations ext3_file_operations;
798 extern struct inode_operations ext3_dir_inode_operations;
799 extern struct inode_operations ext3_special_inode_operations;
802 extern struct inode_operations ext3_symlink_inode_operations;
803 extern struct inode_operations ext3_fast_symlink_inode_operations;
806 #endif /* __KERNEL__ */
808 #endif /* _LINUX_EXT3_FS_H */