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_RESERVATION to reserve data blocks for expanding files
38 #define EXT3_DEFAULT_RESERVE_BLOCKS 8
39 #define EXT3_MAX_RESERVE_BLOCKS 1024
40 #define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
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_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 0x0803DFFF /* User visible flags */
194 #define EXT3_FL_USER_MODIFIABLE 0x080380FF /* 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 */
207 /* Used to pass group descriptor data when online resize is done */
208 struct ext3_new_group_input {
209 __u32 group; /* Group number for this data */
210 __u32 block_bitmap; /* Absolute block number of block bitmap */
211 __u32 inode_bitmap; /* Absolute block number of inode bitmap */
212 __u32 inode_table; /* Absolute block number of inode table start */
213 __u32 blocks_count; /* Total number of blocks in this group */
214 __u16 reserved_blocks; /* Number of reserved blocks in this group */
218 /* The struct ext3_new_group_input in kernel space, with free_blocks_count */
219 struct ext3_new_group_data {
225 __u16 reserved_blocks;
227 __u32 free_blocks_count;
234 #define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
235 #define EXT3_IOC_SETFLAGS _IOW('f', 2, long)
236 #define EXT3_IOC_GETVERSION _IOR('f', 3, long)
237 #define EXT3_IOC_SETVERSION _IOW('f', 4, long)
238 #define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
239 #define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input)
240 #define EXT3_IOC_GETVERSION_OLD _IOR('v', 1, long)
241 #define EXT3_IOC_SETVERSION_OLD _IOW('v', 2, long)
242 #ifdef CONFIG_JBD_DEBUG
243 #define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
245 #ifdef CONFIG_VSERVER_LEGACY
246 #define EXT3_IOC_SETXID FIOC_SETXIDJ
248 #define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
249 #define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
252 * Structure of an inode on the disk
255 __le16 i_mode; /* File mode */
256 __le16 i_uid; /* Low 16 bits of Owner Uid */
257 __le32 i_size; /* Size in bytes */
258 __le32 i_atime; /* Access time */
259 __le32 i_ctime; /* Creation time */
260 __le32 i_mtime; /* Modification time */
261 __le32 i_dtime; /* Deletion Time */
262 __le16 i_gid; /* Low 16 bits of Group Id */
263 __le16 i_links_count; /* Links count */
264 __le32 i_blocks; /* Blocks count */
265 __le32 i_flags; /* File flags */
271 __u32 h_i_translator;
276 } osd1; /* OS dependent 1 */
277 __le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
278 __le32 i_generation; /* File version (for NFS) */
279 __le32 i_file_acl; /* File ACL */
280 __le32 i_dir_acl; /* Directory ACL */
281 __le32 i_faddr; /* Fragment address */
284 __u8 l_i_frag; /* Fragment number */
285 __u8 l_i_fsize; /* Fragment size */
286 __u16 l_i_xid; /* LRU Context */
287 __le16 l_i_uid_high; /* these 2 fields */
288 __le16 l_i_gid_high; /* were reserved2[0] */
292 __u8 h_i_frag; /* Fragment number */
293 __u8 h_i_fsize; /* Fragment size */
300 __u8 m_i_frag; /* Fragment number */
301 __u8 m_i_fsize; /* Fragment size */
303 __u32 m_i_reserved2[2];
305 } osd2; /* OS dependent 2 */
308 #define i_size_high i_dir_acl
310 #if defined(__KERNEL__) || defined(__linux__)
311 #define i_reserved1 osd1.linux1.l_i_reserved1
312 #define i_frag osd2.linux2.l_i_frag
313 #define i_fsize osd2.linux2.l_i_fsize
314 #define i_uid_low i_uid
315 #define i_gid_low i_gid
316 #define i_uid_high osd2.linux2.l_i_uid_high
317 #define i_gid_high osd2.linux2.l_i_gid_high
318 #define i_raw_xid osd2.linux2.l_i_xid
319 #define i_reserved2 osd2.linux2.l_i_reserved2
321 #elif defined(__GNU__)
323 #define i_translator osd1.hurd1.h_i_translator
324 #define i_frag osd2.hurd2.h_i_frag;
325 #define i_fsize osd2.hurd2.h_i_fsize;
326 #define i_uid_high osd2.hurd2.h_i_uid_high
327 #define i_gid_high osd2.hurd2.h_i_gid_high
328 #define i_author osd2.hurd2.h_i_author
330 #elif defined(__masix__)
332 #define i_reserved1 osd1.masix1.m_i_reserved1
333 #define i_frag osd2.masix2.m_i_frag
334 #define i_fsize osd2.masix2.m_i_fsize
335 #define i_reserved2 osd2.masix2.m_i_reserved2
337 #endif /* defined(__KERNEL__) || defined(__linux__) */
342 #define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
343 #define EXT3_ERROR_FS 0x0002 /* Errors detected */
344 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
349 #define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */
350 #define EXT3_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
351 #define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */
352 #define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */
353 #define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
354 #define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
355 #define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
356 #define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
357 #define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
358 #define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */
359 #define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
360 #define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
361 #define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
362 #define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
363 #define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
364 #define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
365 #define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
366 #define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
367 #define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */
368 #define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */
369 #define EXT3_MOUNT_TAG_XID 0x40000 /* Enable Context Tags */
371 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
372 #ifndef _LINUX_EXT2_FS_H
373 #define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
374 #define set_opt(o, opt) o |= EXT3_MOUNT_##opt
375 #define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
378 #define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
379 #define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
380 #define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
383 #define ext3_set_bit ext2_set_bit
384 #define ext3_set_bit_atomic ext2_set_bit_atomic
385 #define ext3_clear_bit ext2_clear_bit
386 #define ext3_clear_bit_atomic ext2_clear_bit_atomic
387 #define ext3_test_bit ext2_test_bit
388 #define ext3_find_first_zero_bit ext2_find_first_zero_bit
389 #define ext3_find_next_zero_bit ext2_find_next_zero_bit
392 * Maximal mount counts between two filesystem checks
394 #define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
395 #define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
398 * Behaviour when detecting errors
400 #define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
401 #define EXT3_ERRORS_RO 2 /* Remount fs read-only */
402 #define EXT3_ERRORS_PANIC 3 /* Panic */
403 #define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
406 * Structure of the super block
408 struct ext3_super_block {
409 /*00*/ __le32 s_inodes_count; /* Inodes count */
410 __le32 s_blocks_count; /* Blocks count */
411 __le32 s_r_blocks_count; /* Reserved blocks count */
412 __le32 s_free_blocks_count; /* Free blocks count */
413 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
414 __le32 s_first_data_block; /* First Data Block */
415 __le32 s_log_block_size; /* Block size */
416 __le32 s_log_frag_size; /* Fragment size */
417 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
418 __le32 s_frags_per_group; /* # Fragments per group */
419 __le32 s_inodes_per_group; /* # Inodes per group */
420 __le32 s_mtime; /* Mount time */
421 /*30*/ __le32 s_wtime; /* Write time */
422 __le16 s_mnt_count; /* Mount count */
423 __le16 s_max_mnt_count; /* Maximal mount count */
424 __le16 s_magic; /* Magic signature */
425 __le16 s_state; /* File system state */
426 __le16 s_errors; /* Behaviour when detecting errors */
427 __le16 s_minor_rev_level; /* minor revision level */
428 /*40*/ __le32 s_lastcheck; /* time of last check */
429 __le32 s_checkinterval; /* max. time between checks */
430 __le32 s_creator_os; /* OS */
431 __le32 s_rev_level; /* Revision level */
432 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
433 __le16 s_def_resgid; /* Default gid for reserved blocks */
435 * These fields are for EXT3_DYNAMIC_REV superblocks only.
437 * Note: the difference between the compatible feature set and
438 * the incompatible feature set is that if there is a bit set
439 * in the incompatible feature set that the kernel doesn't
440 * know about, it should refuse to mount the filesystem.
442 * e2fsck's requirements are more strict; if it doesn't know
443 * about a feature in either the compatible or incompatible
444 * feature set, it must abort and not try to meddle with
445 * things it doesn't understand...
447 __le32 s_first_ino; /* First non-reserved inode */
448 __le16 s_inode_size; /* size of inode structure */
449 __le16 s_block_group_nr; /* block group # of this superblock */
450 __le32 s_feature_compat; /* compatible feature set */
451 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
452 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
453 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
454 /*78*/ char s_volume_name[16]; /* volume name */
455 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
456 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
458 * Performance hints. Directory preallocation should only
459 * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
461 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
462 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
463 __u16 s_reserved_gdt_blocks; /* Per group desc for online growth */
465 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
467 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
468 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
469 __le32 s_journal_dev; /* device number of journal file */
470 __le32 s_last_orphan; /* start of list of inodes to delete */
471 __le32 s_hash_seed[4]; /* HTREE hash seed */
472 __u8 s_def_hash_version; /* Default hash version to use */
473 __u8 s_reserved_char_pad;
474 __u16 s_reserved_word_pad;
475 __le32 s_default_mount_opts;
476 __le32 s_first_meta_bg; /* First metablock block group */
477 __u32 s_reserved[190]; /* Padding to the end of the block */
481 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
483 return sb->s_fs_info;
485 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
487 return container_of(inode, struct ext3_inode_info, vfs_inode);
490 /* Assume that user mode programs are passing in an ext3fs superblock, not
491 * a kernel struct super_block. This will allow us to call the feature-test
492 * macros from user land. */
493 #define EXT3_SB(sb) (sb)
496 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
499 * Codes for operating systems
501 #define EXT3_OS_LINUX 0
502 #define EXT3_OS_HURD 1
503 #define EXT3_OS_MASIX 2
504 #define EXT3_OS_FREEBSD 3
505 #define EXT3_OS_LITES 4
510 #define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
511 #define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
513 #define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
514 #define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
516 #define EXT3_GOOD_OLD_INODE_SIZE 128
519 * Feature set definitions
522 #define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
523 ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
524 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
525 ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
526 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
527 ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
528 #define EXT3_SET_COMPAT_FEATURE(sb,mask) \
529 EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
530 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
531 EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
532 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
533 EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
534 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
535 EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
536 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
537 EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
538 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
539 EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
541 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
542 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
543 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
544 #define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
545 #define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
546 #define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
548 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
549 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
550 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
552 #define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
553 #define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
554 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
555 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
556 #define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
558 #define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
559 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \
560 EXT3_FEATURE_INCOMPAT_RECOVER| \
561 EXT3_FEATURE_INCOMPAT_META_BG)
562 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
563 EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
564 EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
567 * Default values for user and/or group using reserved blocks
569 #define EXT3_DEF_RESUID 0
570 #define EXT3_DEF_RESGID 0
573 * Default mount options
575 #define EXT3_DEFM_DEBUG 0x0001
576 #define EXT3_DEFM_BSDGROUPS 0x0002
577 #define EXT3_DEFM_XATTR_USER 0x0004
578 #define EXT3_DEFM_ACL 0x0008
579 #define EXT3_DEFM_UID16 0x0010
580 #define EXT3_DEFM_JMODE 0x0060
581 #define EXT3_DEFM_JMODE_DATA 0x0020
582 #define EXT3_DEFM_JMODE_ORDERED 0x0040
583 #define EXT3_DEFM_JMODE_WBACK 0x0060
586 * Structure of a directory entry
588 #define EXT3_NAME_LEN 255
590 struct ext3_dir_entry {
591 __le32 inode; /* Inode number */
592 __le16 rec_len; /* Directory entry length */
593 __le16 name_len; /* Name length */
594 char name[EXT3_NAME_LEN]; /* File name */
598 * The new version of the directory entry. Since EXT3 structures are
599 * stored in intel byte order, and the name_len field could never be
600 * bigger than 255 chars, it's safe to reclaim the extra byte for the
603 struct ext3_dir_entry_2 {
604 __le32 inode; /* Inode number */
605 __le16 rec_len; /* Directory entry length */
606 __u8 name_len; /* Name length */
608 char name[EXT3_NAME_LEN]; /* File name */
612 * Ext3 directory file types. Only the low 3 bits are used. The
613 * other bits are reserved for now.
615 #define EXT3_FT_UNKNOWN 0
616 #define EXT3_FT_REG_FILE 1
617 #define EXT3_FT_DIR 2
618 #define EXT3_FT_CHRDEV 3
619 #define EXT3_FT_BLKDEV 4
620 #define EXT3_FT_FIFO 5
621 #define EXT3_FT_SOCK 6
622 #define EXT3_FT_SYMLINK 7
624 #define EXT3_FT_MAX 8
627 * EXT3_DIR_PAD defines the directory entries boundaries
629 * NOTE: It must be a multiple of 4
631 #define EXT3_DIR_PAD 4
632 #define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
633 #define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
636 * Hash Tree Directory indexing
637 * (c) Daniel Phillips, 2001
640 #ifdef CONFIG_EXT3_INDEX
641 #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
642 EXT3_FEATURE_COMPAT_DIR_INDEX) && \
643 (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
644 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
645 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
648 #define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
649 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
652 /* Legal values for the dx_root hash_version field: */
654 #define DX_HASH_LEGACY 0
655 #define DX_HASH_HALF_MD4 1
656 #define DX_HASH_TEA 2
658 /* hash info structure used by the directory hash */
667 #define EXT3_HTREE_EOF 0x7fffffff
671 * Control parameters used by ext3_htree_next_block
673 #define HASH_NB_ALWAYS 1
677 * Describe an inode's exact location on disk and in memory
681 struct buffer_head *bh;
682 unsigned long offset;
683 unsigned long block_group;
686 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
688 return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
692 * This structure is stuffed into the struct file's private_data field
693 * for directories. It is where we put information so that we can do
694 * readdir operations in hash tree order.
696 struct dir_private_info {
698 struct rb_node *curr_node;
699 struct fname *extra_fname;
702 __u32 curr_minor_hash;
707 * Special error return code only used by dx_probe() and its callers.
709 #define ERR_BAD_DX_DIR -75000
712 * Function prototypes
716 * Ok, these declarations are also in <linux/kernel.h> but none of the
717 * ext3 source programs needs to include it so they are duplicated here.
719 # define NORET_TYPE /**/
720 # define ATTRIB_NORET __attribute__((noreturn))
721 # define NORET_AND noreturn,
724 extern int ext3_bg_has_super(struct super_block *sb, int group);
725 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
726 extern int ext3_new_block (handle_t *, struct inode *, unsigned long, int *);
727 extern void ext3_free_blocks (handle_t *, struct inode *, unsigned long,
729 extern void ext3_free_blocks_sb (handle_t *, struct super_block *,
730 unsigned long, unsigned long, int *);
731 extern unsigned long ext3_count_free_blocks (struct super_block *);
732 extern void ext3_check_blocks_bitmap (struct super_block *);
733 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
734 unsigned int block_group,
735 struct buffer_head ** bh);
736 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
737 extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
740 extern int ext3_check_dir_entry(const char *, struct inode *,
741 struct ext3_dir_entry_2 *,
742 struct buffer_head *, unsigned long);
743 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
745 struct ext3_dir_entry_2 *dirent);
746 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
749 extern int ext3_sync_file (struct file *, struct dentry *, int);
752 extern int ext3fs_dirhash(const char *name, int len, struct
753 dx_hash_info *hinfo);
756 extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
757 extern void ext3_free_inode (handle_t *, struct inode *);
758 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
759 extern unsigned long ext3_count_free_inodes (struct super_block *);
760 extern unsigned long ext3_count_dirs (struct super_block *);
761 extern void ext3_check_inodes_bitmap (struct super_block *);
762 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
766 extern int ext3_forget(handle_t *, int, struct inode *, struct buffer_head *, int);
767 extern struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
768 extern struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
770 extern void ext3_read_inode (struct inode *);
771 extern int ext3_write_inode (struct inode *, int);
772 extern int ext3_setattr (struct dentry *, struct iattr *);
773 extern void ext3_put_inode (struct inode *);
774 extern void ext3_delete_inode (struct inode *);
775 extern int ext3_sync_inode (handle_t *, struct inode *);
776 extern void ext3_discard_reservation (struct inode *);
777 extern void ext3_dirty_inode(struct inode *);
778 extern int ext3_change_inode_journal_flag(struct inode *, int);
779 extern void ext3_truncate (struct inode *);
780 extern void ext3_set_inode_flags(struct inode *);
781 extern void ext3_set_aops(struct inode *inode);
784 extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
788 extern int ext3_orphan_add(handle_t *, struct inode *);
789 extern int ext3_orphan_del(handle_t *, struct inode *);
790 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
791 __u32 start_minor_hash, __u32 *next_hash);
794 extern int ext3_group_add(struct super_block *sb,
795 struct ext3_new_group_data *input);
796 extern int ext3_group_extend(struct super_block *sb,
797 struct ext3_super_block *es,
798 unsigned long n_blocks_count);
801 extern void ext3_error (struct super_block *, const char *, const char *, ...)
802 __attribute__ ((format (printf, 3, 4)));
803 extern void __ext3_std_error (struct super_block *, const char *, int);
804 extern void ext3_abort (struct super_block *, const char *, const char *, ...)
805 __attribute__ ((format (printf, 3, 4)));
806 extern NORET_TYPE void ext3_panic (struct super_block *, const char *,
808 __attribute__ ((NORET_AND format (printf, 3, 4)));
809 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
810 __attribute__ ((format (printf, 3, 4)));
811 extern void ext3_update_dynamic_rev (struct super_block *sb);
812 extern void ext3_put_super (struct super_block *);
813 extern void ext3_write_super (struct super_block *);
814 extern void ext3_write_super_lockfs (struct super_block *);
815 extern void ext3_unlockfs (struct super_block *);
816 extern int ext3_remount (struct super_block *, int *, char *);
817 extern int ext3_statfs (struct super_block *, struct kstatfs *);
819 #define ext3_std_error(sb, errno) \
822 __ext3_std_error((sb), __FUNCTION__, (errno)); \
824 extern const char *ext3_decode_error(struct super_block *sb, int errno, char nbuf[16]);
827 * Inodes and files operations
831 extern struct file_operations ext3_dir_operations;
834 extern struct inode_operations ext3_file_inode_operations;
835 extern struct file_operations ext3_file_operations;
838 extern struct inode_operations ext3_dir_inode_operations;
839 extern struct inode_operations ext3_special_inode_operations;
842 extern struct inode_operations ext3_symlink_inode_operations;
843 extern struct inode_operations ext3_fast_symlink_inode_operations;
846 #endif /* __KERNEL__ */
848 #endif /* _LINUX_EXT3_FS_H */