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 __le32 bg_block_bitmap; /* Blocks bitmap block */
133 __le32 bg_inode_bitmap; /* Inodes bitmap block */
134 __le32 bg_inode_table; /* Inodes table block */
135 __le16 bg_free_blocks_count; /* Free blocks count */
136 __le16 bg_free_inodes_count; /* Free inodes count */
137 __le16 bg_used_dirs_count; /* Directories count */
139 __le32 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_RESERVED_FL 0x80000000 /* reserved for ext3 lib */
190 #define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
191 #define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
194 * Inode dynamic state flags
196 #define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */
197 #define EXT3_STATE_NEW 0x00000002 /* inode is newly created */
202 #define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
203 #define EXT3_IOC_SETFLAGS _IOW('f', 2, long)
204 #define EXT3_IOC_GETVERSION _IOR('f', 3, long)
205 #define EXT3_IOC_SETVERSION _IOW('f', 4, long)
206 #define EXT3_IOC_GETVERSION_OLD _IOR('v', 1, long)
207 #define EXT3_IOC_SETVERSION_OLD _IOW('v', 2, long)
208 #ifdef CONFIG_JBD_DEBUG
209 #define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
213 * Structure of an inode on the disk
216 __le16 i_mode; /* File mode */
217 __le16 i_uid; /* Low 16 bits of Owner Uid */
218 __le32 i_size; /* Size in bytes */
219 __le32 i_atime; /* Access time */
220 __le32 i_ctime; /* Creation time */
221 __le32 i_mtime; /* Modification time */
222 __le32 i_dtime; /* Deletion Time */
223 __le16 i_gid; /* Low 16 bits of Group Id */
224 __le16 i_links_count; /* Links count */
225 __le32 i_blocks; /* Blocks count */
226 __le32 i_flags; /* File flags */
232 __u32 h_i_translator;
237 } osd1; /* OS dependent 1 */
238 __le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
239 __le32 i_generation; /* File version (for NFS) */
240 __le32 i_file_acl; /* File ACL */
241 __le32 i_dir_acl; /* Directory ACL */
242 __le32 i_faddr; /* Fragment address */
245 __u8 l_i_frag; /* Fragment number */
246 __u8 l_i_fsize; /* Fragment size */
248 __le16 l_i_uid_high; /* these 2 fields */
249 __le16 l_i_gid_high; /* were reserved2[0] */
253 __u8 h_i_frag; /* Fragment number */
254 __u8 h_i_fsize; /* Fragment size */
261 __u8 m_i_frag; /* Fragment number */
262 __u8 m_i_fsize; /* Fragment size */
264 __u32 m_i_reserved2[2];
266 } osd2; /* OS dependent 2 */
269 #define i_size_high i_dir_acl
271 #if defined(__KERNEL__) || defined(__linux__)
272 #define i_reserved1 osd1.linux1.l_i_reserved1
273 #define i_frag osd2.linux2.l_i_frag
274 #define i_fsize osd2.linux2.l_i_fsize
275 #define i_uid_low i_uid
276 #define i_gid_low i_gid
277 #define i_uid_high osd2.linux2.l_i_uid_high
278 #define i_gid_high osd2.linux2.l_i_gid_high
279 #define i_reserved2 osd2.linux2.l_i_reserved2
281 #elif defined(__GNU__)
283 #define i_translator osd1.hurd1.h_i_translator
284 #define i_frag osd2.hurd2.h_i_frag;
285 #define i_fsize osd2.hurd2.h_i_fsize;
286 #define i_uid_high osd2.hurd2.h_i_uid_high
287 #define i_gid_high osd2.hurd2.h_i_gid_high
288 #define i_author osd2.hurd2.h_i_author
290 #elif defined(__masix__)
292 #define i_reserved1 osd1.masix1.m_i_reserved1
293 #define i_frag osd2.masix2.m_i_frag
294 #define i_fsize osd2.masix2.m_i_fsize
295 #define i_reserved2 osd2.masix2.m_i_reserved2
297 #endif /* defined(__KERNEL__) || defined(__linux__) */
302 #define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
303 #define EXT3_ERROR_FS 0x0002 /* Errors detected */
304 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
309 #define EXT3_MOUNT_CHECK 0x0001 /* Do mount-time checks */
310 #define EXT3_MOUNT_OLDALLOC 0x0002 /* Don't use the new Orlov allocator */
311 #define EXT3_MOUNT_GRPID 0x0004 /* Create files with directory's group */
312 #define EXT3_MOUNT_DEBUG 0x0008 /* Some debugging messages */
313 #define EXT3_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
314 #define EXT3_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
315 #define EXT3_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
316 #define EXT3_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
317 #define EXT3_MOUNT_NOLOAD 0x0100 /* Don't use existing journal*/
318 #define EXT3_MOUNT_ABORT 0x0200 /* Fatal error detected */
319 #define EXT3_MOUNT_DATA_FLAGS 0x0C00 /* Mode for data writes: */
320 #define EXT3_MOUNT_JOURNAL_DATA 0x0400 /* Write data to journal */
321 #define EXT3_MOUNT_ORDERED_DATA 0x0800 /* Flush data before commit */
322 #define EXT3_MOUNT_WRITEBACK_DATA 0x0C00 /* No data ordering */
323 #define EXT3_MOUNT_UPDATE_JOURNAL 0x1000 /* Update the journal format */
324 #define EXT3_MOUNT_NO_UID32 0x2000 /* Disable 32-bit UIDs */
325 #define EXT3_MOUNT_XATTR_USER 0x4000 /* Extended user attributes */
326 #define EXT3_MOUNT_POSIX_ACL 0x8000 /* POSIX Access Control Lists */
327 #define EXT3_MOUNT_BARRIER 0x10000 /* Use block barriers */
329 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
330 #ifndef _LINUX_EXT2_FS_H
331 #define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
332 #define set_opt(o, opt) o |= EXT3_MOUNT_##opt
333 #define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
336 #define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
337 #define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
338 #define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
341 #define ext3_set_bit ext2_set_bit
342 #define ext3_set_bit_atomic ext2_set_bit_atomic
343 #define ext3_clear_bit ext2_clear_bit
344 #define ext3_clear_bit_atomic ext2_clear_bit_atomic
345 #define ext3_test_bit ext2_test_bit
346 #define ext3_find_first_zero_bit ext2_find_first_zero_bit
347 #define ext3_find_next_zero_bit ext2_find_next_zero_bit
350 * Maximal mount counts between two filesystem checks
352 #define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
353 #define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
356 * Behaviour when detecting errors
358 #define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
359 #define EXT3_ERRORS_RO 2 /* Remount fs read-only */
360 #define EXT3_ERRORS_PANIC 3 /* Panic */
361 #define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
364 * Structure of the super block
366 struct ext3_super_block {
367 /*00*/ __le32 s_inodes_count; /* Inodes count */
368 __le32 s_blocks_count; /* Blocks count */
369 __le32 s_r_blocks_count; /* Reserved blocks count */
370 __le32 s_free_blocks_count; /* Free blocks count */
371 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
372 __le32 s_first_data_block; /* First Data Block */
373 __le32 s_log_block_size; /* Block size */
374 __le32 s_log_frag_size; /* Fragment size */
375 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
376 __le32 s_frags_per_group; /* # Fragments per group */
377 __le32 s_inodes_per_group; /* # Inodes per group */
378 __le32 s_mtime; /* Mount time */
379 /*30*/ __le32 s_wtime; /* Write time */
380 __le16 s_mnt_count; /* Mount count */
381 __le16 s_max_mnt_count; /* Maximal mount count */
382 __le16 s_magic; /* Magic signature */
383 __le16 s_state; /* File system state */
384 __le16 s_errors; /* Behaviour when detecting errors */
385 __le16 s_minor_rev_level; /* minor revision level */
386 /*40*/ __le32 s_lastcheck; /* time of last check */
387 __le32 s_checkinterval; /* max. time between checks */
388 __le32 s_creator_os; /* OS */
389 __le32 s_rev_level; /* Revision level */
390 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
391 __le16 s_def_resgid; /* Default gid for reserved blocks */
393 * These fields are for EXT3_DYNAMIC_REV superblocks only.
395 * Note: the difference between the compatible feature set and
396 * the incompatible feature set is that if there is a bit set
397 * in the incompatible feature set that the kernel doesn't
398 * know about, it should refuse to mount the filesystem.
400 * e2fsck's requirements are more strict; if it doesn't know
401 * about a feature in either the compatible or incompatible
402 * feature set, it must abort and not try to meddle with
403 * things it doesn't understand...
405 __le32 s_first_ino; /* First non-reserved inode */
406 __le16 s_inode_size; /* size of inode structure */
407 __le16 s_block_group_nr; /* block group # of this superblock */
408 __le32 s_feature_compat; /* compatible feature set */
409 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
410 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
411 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
412 /*78*/ char s_volume_name[16]; /* volume name */
413 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
414 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
416 * Performance hints. Directory preallocation should only
417 * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
419 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
420 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
423 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
425 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
426 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
427 __le32 s_journal_dev; /* device number of journal file */
428 __le32 s_last_orphan; /* start of list of inodes to delete */
429 __le32 s_hash_seed[4]; /* HTREE hash seed */
430 __u8 s_def_hash_version; /* Default hash version to use */
431 __u8 s_reserved_char_pad;
432 __u16 s_reserved_word_pad;
433 __le32 s_default_mount_opts;
434 __le32 s_first_meta_bg; /* First metablock block group */
435 __u32 s_reserved[190]; /* Padding to the end of the block */
439 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
441 return sb->s_fs_info;
443 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
445 return container_of(inode, struct ext3_inode_info, vfs_inode);
448 /* Assume that user mode programs are passing in an ext3fs superblock, not
449 * a kernel struct super_block. This will allow us to call the feature-test
450 * macros from user land. */
451 #define EXT3_SB(sb) (sb)
454 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
457 * Codes for operating systems
459 #define EXT3_OS_LINUX 0
460 #define EXT3_OS_HURD 1
461 #define EXT3_OS_MASIX 2
462 #define EXT3_OS_FREEBSD 3
463 #define EXT3_OS_LITES 4
468 #define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
469 #define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
471 #define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
472 #define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
474 #define EXT3_GOOD_OLD_INODE_SIZE 128
477 * Feature set definitions
480 #define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
481 ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
482 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
483 ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
484 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
485 ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
486 #define EXT3_SET_COMPAT_FEATURE(sb,mask) \
487 EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
488 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
489 EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
490 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
491 EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
492 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
493 EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
494 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
495 EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
496 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
497 EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
499 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
500 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
501 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
502 #define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
503 #define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
504 #define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
506 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
507 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
508 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
510 #define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
511 #define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
512 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
513 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
514 #define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
516 #define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
517 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \
518 EXT3_FEATURE_INCOMPAT_RECOVER| \
519 EXT3_FEATURE_INCOMPAT_META_BG)
520 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
521 EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
522 EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
525 * Default values for user and/or group using reserved blocks
527 #define EXT3_DEF_RESUID 0
528 #define EXT3_DEF_RESGID 0
531 * Default mount options
533 #define EXT3_DEFM_DEBUG 0x0001
534 #define EXT3_DEFM_BSDGROUPS 0x0002
535 #define EXT3_DEFM_XATTR_USER 0x0004
536 #define EXT3_DEFM_ACL 0x0008
537 #define EXT3_DEFM_UID16 0x0010
538 #define EXT3_DEFM_JMODE 0x0060
539 #define EXT3_DEFM_JMODE_DATA 0x0020
540 #define EXT3_DEFM_JMODE_ORDERED 0x0040
541 #define EXT3_DEFM_JMODE_WBACK 0x0060
544 * Structure of a directory entry
546 #define EXT3_NAME_LEN 255
548 struct ext3_dir_entry {
549 __le32 inode; /* Inode number */
550 __le16 rec_len; /* Directory entry length */
551 __le16 name_len; /* Name length */
552 char name[EXT3_NAME_LEN]; /* File name */
556 * The new version of the directory entry. Since EXT3 structures are
557 * stored in intel byte order, and the name_len field could never be
558 * bigger than 255 chars, it's safe to reclaim the extra byte for the
561 struct ext3_dir_entry_2 {
562 __le32 inode; /* Inode number */
563 __le16 rec_len; /* Directory entry length */
564 __u8 name_len; /* Name length */
566 char name[EXT3_NAME_LEN]; /* File name */
570 * Ext3 directory file types. Only the low 3 bits are used. The
571 * other bits are reserved for now.
573 #define EXT3_FT_UNKNOWN 0
574 #define EXT3_FT_REG_FILE 1
575 #define EXT3_FT_DIR 2
576 #define EXT3_FT_CHRDEV 3
577 #define EXT3_FT_BLKDEV 4
578 #define EXT3_FT_FIFO 5
579 #define EXT3_FT_SOCK 6
580 #define EXT3_FT_SYMLINK 7
582 #define EXT3_FT_MAX 8
585 * EXT3_DIR_PAD defines the directory entries boundaries
587 * NOTE: It must be a multiple of 4
589 #define EXT3_DIR_PAD 4
590 #define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
591 #define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
594 * Hash Tree Directory indexing
595 * (c) Daniel Phillips, 2001
598 #ifdef CONFIG_EXT3_INDEX
599 #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
600 EXT3_FEATURE_COMPAT_DIR_INDEX) && \
601 (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
602 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
603 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
606 #define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
607 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
610 /* Legal values for the dx_root hash_version field: */
612 #define DX_HASH_LEGACY 0
613 #define DX_HASH_HALF_MD4 1
614 #define DX_HASH_TEA 2
616 /* hash info structure used by the directory hash */
625 #define EXT3_HTREE_EOF 0x7fffffff
629 * Control parameters used by ext3_htree_next_block
631 #define HASH_NB_ALWAYS 1
635 * Describe an inode's exact location on disk and in memory
639 struct buffer_head *bh;
640 unsigned long offset;
641 unsigned long block_group;
644 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
646 return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
650 * This structure is stuffed into the struct file's private_data field
651 * for directories. It is where we put information so that we can do
652 * readdir operations in hash tree order.
654 struct dir_private_info {
656 struct rb_node *curr_node;
657 struct fname *extra_fname;
660 __u32 curr_minor_hash;
665 * Special error return code only used by dx_probe() and its callers.
667 #define ERR_BAD_DX_DIR -75000
670 * Function prototypes
674 * Ok, these declarations are also in <linux/kernel.h> but none of the
675 * ext3 source programs needs to include it so they are duplicated here.
677 # define NORET_TYPE /**/
678 # define ATTRIB_NORET __attribute__((noreturn))
679 # define NORET_AND noreturn,
682 extern int ext3_bg_has_super(struct super_block *sb, int group);
683 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
684 extern int ext3_new_block (handle_t *, struct inode *, unsigned long,
685 __u32 *, __u32 *, int *);
686 extern void ext3_free_blocks (handle_t *, struct inode *, unsigned long,
688 extern unsigned long ext3_count_free_blocks (struct super_block *);
689 extern void ext3_check_blocks_bitmap (struct super_block *);
690 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
691 unsigned int block_group,
692 struct buffer_head ** bh);
693 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
696 extern int ext3_check_dir_entry(const char *, struct inode *,
697 struct ext3_dir_entry_2 *,
698 struct buffer_head *, unsigned long);
699 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
701 struct ext3_dir_entry_2 *dirent);
702 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
705 extern int ext3_sync_file (struct file *, struct dentry *, int);
708 extern int ext3fs_dirhash(const char *name, int len, struct
709 dx_hash_info *hinfo);
712 extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
713 extern void ext3_free_inode (handle_t *, struct inode *);
714 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
715 extern unsigned long ext3_count_free_inodes (struct super_block *);
716 extern unsigned long ext3_count_dirs (struct super_block *);
717 extern void ext3_check_inodes_bitmap (struct super_block *);
718 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
722 extern int ext3_forget(handle_t *, int, struct inode *, struct buffer_head *, int);
723 extern struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
724 extern struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
726 extern void ext3_read_inode (struct inode *);
727 extern int ext3_write_inode (struct inode *, int);
728 extern int ext3_setattr (struct dentry *, struct iattr *);
729 extern void ext3_put_inode (struct inode *);
730 extern void ext3_delete_inode (struct inode *);
731 extern int ext3_sync_inode (handle_t *, struct inode *);
732 extern void ext3_discard_prealloc (struct inode *);
733 extern void ext3_dirty_inode(struct inode *);
734 extern int ext3_change_inode_journal_flag(struct inode *, int);
735 extern void ext3_truncate (struct inode *);
736 extern void ext3_set_inode_flags(struct inode *);
737 extern void ext3_set_aops(struct inode *inode);
740 extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
744 extern int ext3_orphan_add(handle_t *, struct inode *);
745 extern int ext3_orphan_del(handle_t *, struct inode *);
746 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
747 __u32 start_minor_hash, __u32 *next_hash);
750 extern void ext3_error (struct super_block *, const char *, const char *, ...)
751 __attribute__ ((format (printf, 3, 4)));
752 extern void __ext3_std_error (struct super_block *, const char *, int);
753 extern void ext3_abort (struct super_block *, const char *, const char *, ...)
754 __attribute__ ((format (printf, 3, 4)));
755 extern NORET_TYPE void ext3_panic (struct super_block *, const char *,
757 __attribute__ ((NORET_AND format (printf, 3, 4)));
758 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
759 __attribute__ ((format (printf, 3, 4)));
760 extern void ext3_update_dynamic_rev (struct super_block *sb);
761 extern void ext3_put_super (struct super_block *);
762 extern void ext3_write_super (struct super_block *);
763 extern void ext3_write_super_lockfs (struct super_block *);
764 extern void ext3_unlockfs (struct super_block *);
765 extern int ext3_remount (struct super_block *, int *, char *);
766 extern int ext3_statfs (struct super_block *, struct kstatfs *);
768 #define ext3_std_error(sb, errno) \
771 __ext3_std_error((sb), __FUNCTION__, (errno)); \
773 extern const char *ext3_decode_error(struct super_block *sb, int errno, char nbuf[16]);
776 * Inodes and files operations
780 extern struct file_operations ext3_dir_operations;
783 extern struct inode_operations ext3_file_inode_operations;
784 extern struct file_operations ext3_file_operations;
787 extern struct inode_operations ext3_dir_inode_operations;
788 extern struct inode_operations ext3_special_inode_operations;
791 extern struct inode_operations ext3_symlink_inode_operations;
792 extern struct inode_operations ext3_fast_symlink_inode_operations;
795 #endif /* __KERNEL__ */
797 #endif /* _LINUX_EXT3_FS_H */