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
41 * Always enable hashed directories
43 #define CONFIG_EXT3_INDEX
49 #define ext3_debug(f, a...) \
51 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:", \
52 __FILE__, __LINE__, __FUNCTION__); \
53 printk (KERN_DEBUG f, ## a); \
56 #define ext3_debug(f, a...) do {} while (0)
60 * Special inodes numbers
62 #define EXT3_BAD_INO 1 /* Bad blocks inode */
63 #define EXT3_ROOT_INO 2 /* Root inode */
64 #define EXT3_BOOT_LOADER_INO 5 /* Boot loader inode */
65 #define EXT3_UNDEL_DIR_INO 6 /* Undelete directory inode */
66 #define EXT3_RESIZE_INO 7 /* Reserved group descriptors inode */
67 #define EXT3_JOURNAL_INO 8 /* Journal inode */
69 /* First non-reserved inode for old ext3 filesystems */
70 #define EXT3_GOOD_OLD_FIRST_INO 11
73 * The second extended file system magic number
75 #define EXT3_SUPER_MAGIC 0xEF53
78 * Maximal count of links to a file
80 #define EXT3_LINK_MAX 32000
83 * Macro-instructions used to manage several block sizes
85 #define EXT3_MIN_BLOCK_SIZE 1024
86 #define EXT3_MAX_BLOCK_SIZE 4096
87 #define EXT3_MIN_BLOCK_LOG_SIZE 10
89 # define EXT3_BLOCK_SIZE(s) ((s)->s_blocksize)
91 # define EXT3_BLOCK_SIZE(s) (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
93 #define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
95 # define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
97 # define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
100 #define EXT3_ADDR_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_addr_per_block_bits)
101 #define EXT3_INODE_SIZE(s) (EXT3_SB(s)->s_inode_size)
102 #define EXT3_FIRST_INO(s) (EXT3_SB(s)->s_first_ino)
104 #define EXT3_INODE_SIZE(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
105 EXT3_GOOD_OLD_INODE_SIZE : \
107 #define EXT3_FIRST_INO(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
108 EXT3_GOOD_OLD_FIRST_INO : \
113 * Macro-instructions used to manage fragments
115 #define EXT3_MIN_FRAG_SIZE 1024
116 #define EXT3_MAX_FRAG_SIZE 4096
117 #define EXT3_MIN_FRAG_LOG_SIZE 10
119 # define EXT3_FRAG_SIZE(s) (EXT3_SB(s)->s_frag_size)
120 # define EXT3_FRAGS_PER_BLOCK(s) (EXT3_SB(s)->s_frags_per_block)
122 # define EXT3_FRAG_SIZE(s) (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
123 # define EXT3_FRAGS_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
127 * Structure of a blocks group descriptor
129 struct ext3_group_desc
131 __u32 bg_block_bitmap; /* Blocks bitmap block */
132 __u32 bg_inode_bitmap; /* Inodes bitmap block */
133 __u32 bg_inode_table; /* Inodes table block */
134 __u16 bg_free_blocks_count; /* Free blocks count */
135 __u16 bg_free_inodes_count; /* Free inodes count */
136 __u16 bg_used_dirs_count; /* Directories count */
138 __u32 bg_reserved[3];
142 * Macro-instructions used to manage group descriptors
145 # define EXT3_BLOCKS_PER_GROUP(s) (EXT3_SB(s)->s_blocks_per_group)
146 # define EXT3_DESC_PER_BLOCK(s) (EXT3_SB(s)->s_desc_per_block)
147 # define EXT3_INODES_PER_GROUP(s) (EXT3_SB(s)->s_inodes_per_group)
148 # define EXT3_DESC_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_desc_per_block_bits)
150 # define EXT3_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
151 # define EXT3_DESC_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
152 # define EXT3_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
156 * Constants relative to the data blocks
158 #define EXT3_NDIR_BLOCKS 12
159 #define EXT3_IND_BLOCK EXT3_NDIR_BLOCKS
160 #define EXT3_DIND_BLOCK (EXT3_IND_BLOCK + 1)
161 #define EXT3_TIND_BLOCK (EXT3_DIND_BLOCK + 1)
162 #define EXT3_N_BLOCKS (EXT3_TIND_BLOCK + 1)
167 #define EXT3_SECRM_FL 0x00000001 /* Secure deletion */
168 #define EXT3_UNRM_FL 0x00000002 /* Undelete */
169 #define EXT3_COMPR_FL 0x00000004 /* Compress file */
170 #define EXT3_SYNC_FL 0x00000008 /* Synchronous updates */
171 #define EXT3_IMMUTABLE_FL 0x00000010 /* Immutable file */
172 #define EXT3_APPEND_FL 0x00000020 /* writes to file may only append */
173 #define EXT3_NODUMP_FL 0x00000040 /* do not dump file */
174 #define EXT3_NOATIME_FL 0x00000080 /* do not update atime */
175 /* Reserved for compression usage... */
176 #define EXT3_DIRTY_FL 0x00000100
177 #define EXT3_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
178 #define EXT3_NOCOMPR_FL 0x00000400 /* Don't compress */
179 #define EXT3_ECOMPR_FL 0x00000800 /* Compression error */
180 /* End compression flags --- maybe not all used */
181 #define EXT3_INDEX_FL 0x00001000 /* hash-indexed directory */
182 #define EXT3_IMAGIC_FL 0x00002000 /* AFS directory */
183 #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
184 #define EXT3_NOTAIL_FL 0x00008000 /* file tail should not be merged */
185 #define EXT3_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
186 #define EXT3_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
187 #define EXT3_RESERVED_FL 0x80000000 /* reserved for ext3 lib */
189 #define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
190 #define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
193 * Inode dynamic state flags
195 #define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */
196 #define EXT3_STATE_NEW 0x00000002 /* inode is newly created */
197 #define EXT3_STATE_RESIZE 0x00000004 /* fake inode for resizing */
200 /* Used to pass group descriptor data when online resize is done */
201 struct ext3_new_group_input {
202 __u32 group; /* Group number for this data */
203 __u32 block_bitmap; /* Absolute block number of block bitmap */
204 __u32 inode_bitmap; /* Absolute block number of inode bitmap */
205 __u32 inode_table; /* Absolute block number of inode table start */
206 __u32 blocks_count; /* Total number of blocks in this group */
207 __u16 reserved_blocks; /* Number of reserved blocks in this group */
211 /* The struct ext3_new_group_input in kernel space, with free_blocks_count */
212 struct ext3_new_group_data {
218 __u16 reserved_blocks;
220 __u32 free_blocks_count;
227 #define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
228 #define EXT3_IOC_SETFLAGS _IOW('f', 2, long)
229 #define EXT3_IOC_GETVERSION _IOR('f', 3, long)
230 #define EXT3_IOC_SETVERSION _IOW('f', 4, long)
231 #define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
232 #define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input)
233 #define EXT3_IOC_GETVERSION_OLD _IOR('v', 1, long)
234 #define EXT3_IOC_SETVERSION_OLD _IOW('v', 2, long)
235 #ifdef CONFIG_JBD_DEBUG
236 #define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
238 #define EXT3_IOC_GETRSVSZ _IOR('r', 1, long)
239 #define EXT3_IOC_SETRSVSZ _IOW('r', 2, long)
242 * Structure of an inode on the disk
245 __u16 i_mode; /* File mode */
246 __u16 i_uid; /* Low 16 bits of Owner Uid */
247 __u32 i_size; /* Size in bytes */
248 __u32 i_atime; /* Access time */
249 __u32 i_ctime; /* Creation time */
250 __u32 i_mtime; /* Modification time */
251 __u32 i_dtime; /* Deletion Time */
252 __u16 i_gid; /* Low 16 bits of Group Id */
253 __u16 i_links_count; /* Links count */
254 __u32 i_blocks; /* Blocks count */
255 __u32 i_flags; /* File flags */
261 __u32 h_i_translator;
266 } osd1; /* OS dependent 1 */
267 __u32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
268 __u32 i_generation; /* File version (for NFS) */
269 __u32 i_file_acl; /* File ACL */
270 __u32 i_dir_acl; /* Directory ACL */
271 __u32 i_faddr; /* Fragment address */
274 __u8 l_i_frag; /* Fragment number */
275 __u8 l_i_fsize; /* Fragment size */
277 __u16 l_i_uid_high; /* these 2 fields */
278 __u16 l_i_gid_high; /* were reserved2[0] */
282 __u8 h_i_frag; /* Fragment number */
283 __u8 h_i_fsize; /* Fragment size */
290 __u8 m_i_frag; /* Fragment number */
291 __u8 m_i_fsize; /* Fragment size */
293 __u32 m_i_reserved2[2];
295 } osd2; /* OS dependent 2 */
298 #define i_size_high i_dir_acl
300 #if defined(__KERNEL__) || defined(__linux__)
301 #define i_reserved1 osd1.linux1.l_i_reserved1
302 #define i_frag osd2.linux2.l_i_frag
303 #define i_fsize osd2.linux2.l_i_fsize
304 #define i_uid_low i_uid
305 #define i_gid_low i_gid
306 #define i_uid_high osd2.linux2.l_i_uid_high
307 #define i_gid_high osd2.linux2.l_i_gid_high
308 #define i_reserved2 osd2.linux2.l_i_reserved2
310 #elif defined(__GNU__)
312 #define i_translator osd1.hurd1.h_i_translator
313 #define i_frag osd2.hurd2.h_i_frag;
314 #define i_fsize osd2.hurd2.h_i_fsize;
315 #define i_uid_high osd2.hurd2.h_i_uid_high
316 #define i_gid_high osd2.hurd2.h_i_gid_high
317 #define i_author osd2.hurd2.h_i_author
319 #elif defined(__masix__)
321 #define i_reserved1 osd1.masix1.m_i_reserved1
322 #define i_frag osd2.masix2.m_i_frag
323 #define i_fsize osd2.masix2.m_i_fsize
324 #define i_reserved2 osd2.masix2.m_i_reserved2
326 #endif /* defined(__KERNEL__) || defined(__linux__) */
331 #define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
332 #define EXT3_ERROR_FS 0x0002 /* Errors detected */
333 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
338 #define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */
339 #define EXT3_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
340 #define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */
341 #define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */
342 #define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
343 #define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
344 #define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
345 #define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
346 #define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
347 #define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */
348 #define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
349 #define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
350 #define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
351 #define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
352 #define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
353 #define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
354 #define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
355 #define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
356 #define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */
358 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
359 #ifndef _LINUX_EXT2_FS_H
360 #define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
361 #define set_opt(o, opt) o |= EXT3_MOUNT_##opt
362 #define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
365 #define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
366 #define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
367 #define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
370 #define ext3_set_bit ext2_set_bit
371 #define ext3_set_bit_atomic ext2_set_bit_atomic
372 #define ext3_clear_bit ext2_clear_bit
373 #define ext3_clear_bit_atomic ext2_clear_bit_atomic
374 #define ext3_test_bit ext2_test_bit
375 #define ext3_find_first_zero_bit ext2_find_first_zero_bit
376 #define ext3_find_next_zero_bit ext2_find_next_zero_bit
379 * Maximal mount counts between two filesystem checks
381 #define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
382 #define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
385 * Behaviour when detecting errors
387 #define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
388 #define EXT3_ERRORS_RO 2 /* Remount fs read-only */
389 #define EXT3_ERRORS_PANIC 3 /* Panic */
390 #define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
393 * Structure of the super block
395 struct ext3_super_block {
396 /*00*/ __u32 s_inodes_count; /* Inodes count */
397 __u32 s_blocks_count; /* Blocks count */
398 __u32 s_r_blocks_count; /* Reserved blocks count */
399 __u32 s_free_blocks_count; /* Free blocks count */
400 /*10*/ __u32 s_free_inodes_count; /* Free inodes count */
401 __u32 s_first_data_block; /* First Data Block */
402 __u32 s_log_block_size; /* Block size */
403 __s32 s_log_frag_size; /* Fragment size */
404 /*20*/ __u32 s_blocks_per_group; /* # Blocks per group */
405 __u32 s_frags_per_group; /* # Fragments per group */
406 __u32 s_inodes_per_group; /* # Inodes per group */
407 __u32 s_mtime; /* Mount time */
408 /*30*/ __u32 s_wtime; /* Write time */
409 __u16 s_mnt_count; /* Mount count */
410 __s16 s_max_mnt_count; /* Maximal mount count */
411 __u16 s_magic; /* Magic signature */
412 __u16 s_state; /* File system state */
413 __u16 s_errors; /* Behaviour when detecting errors */
414 __u16 s_minor_rev_level; /* minor revision level */
415 /*40*/ __u32 s_lastcheck; /* time of last check */
416 __u32 s_checkinterval; /* max. time between checks */
417 __u32 s_creator_os; /* OS */
418 __u32 s_rev_level; /* Revision level */
419 /*50*/ __u16 s_def_resuid; /* Default uid for reserved blocks */
420 __u16 s_def_resgid; /* Default gid for reserved blocks */
422 * These fields are for EXT3_DYNAMIC_REV superblocks only.
424 * Note: the difference between the compatible feature set and
425 * the incompatible feature set is that if there is a bit set
426 * in the incompatible feature set that the kernel doesn't
427 * know about, it should refuse to mount the filesystem.
429 * e2fsck's requirements are more strict; if it doesn't know
430 * about a feature in either the compatible or incompatible
431 * feature set, it must abort and not try to meddle with
432 * things it doesn't understand...
434 __u32 s_first_ino; /* First non-reserved inode */
435 __u16 s_inode_size; /* size of inode structure */
436 __u16 s_block_group_nr; /* block group # of this superblock */
437 __u32 s_feature_compat; /* compatible feature set */
438 /*60*/ __u32 s_feature_incompat; /* incompatible feature set */
439 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
440 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
441 /*78*/ char s_volume_name[16]; /* volume name */
442 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
443 /*C8*/ __u32 s_algorithm_usage_bitmap; /* For compression */
445 * Performance hints. Directory preallocation should only
446 * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
448 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
449 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
450 __u16 s_reserved_gdt_blocks; /* Per group desc for online growth */
452 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
454 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
455 /*E0*/ __u32 s_journal_inum; /* inode number of journal file */
456 __u32 s_journal_dev; /* device number of journal file */
457 __u32 s_last_orphan; /* start of list of inodes to delete */
458 __u32 s_hash_seed[4]; /* HTREE hash seed */
459 __u8 s_def_hash_version; /* Default hash version to use */
460 __u8 s_reserved_char_pad;
461 __u16 s_reserved_word_pad;
462 __u32 s_default_mount_opts;
463 __u32 s_first_meta_bg; /* First metablock block group */
464 __u32 s_reserved[190]; /* Padding to the end of the block */
468 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
470 return sb->s_fs_info;
472 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
474 return container_of(inode, struct ext3_inode_info, vfs_inode);
477 /* Assume that user mode programs are passing in an ext3fs superblock, not
478 * a kernel struct super_block. This will allow us to call the feature-test
479 * macros from user land. */
480 #define EXT3_SB(sb) (sb)
483 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
486 * Codes for operating systems
488 #define EXT3_OS_LINUX 0
489 #define EXT3_OS_HURD 1
490 #define EXT3_OS_MASIX 2
491 #define EXT3_OS_FREEBSD 3
492 #define EXT3_OS_LITES 4
497 #define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
498 #define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
500 #define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
501 #define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
503 #define EXT3_GOOD_OLD_INODE_SIZE 128
506 * Feature set definitions
509 #define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
510 ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
511 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
512 ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
513 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
514 ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
515 #define EXT3_SET_COMPAT_FEATURE(sb,mask) \
516 EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
517 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
518 EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
519 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
520 EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
521 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
522 EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
523 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
524 EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
525 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
526 EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
528 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
529 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
530 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
531 #define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
532 #define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
533 #define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
535 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
536 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
537 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
539 #define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
540 #define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
541 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
542 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
543 #define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
545 #define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
546 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \
547 EXT3_FEATURE_INCOMPAT_RECOVER| \
548 EXT3_FEATURE_INCOMPAT_META_BG)
549 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
550 EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
551 EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
554 * Default values for user and/or group using reserved blocks
556 #define EXT3_DEF_RESUID 0
557 #define EXT3_DEF_RESGID 0
560 * Default mount options
562 #define EXT3_DEFM_DEBUG 0x0001
563 #define EXT3_DEFM_BSDGROUPS 0x0002
564 #define EXT3_DEFM_XATTR_USER 0x0004
565 #define EXT3_DEFM_ACL 0x0008
566 #define EXT3_DEFM_UID16 0x0010
567 #define EXT3_DEFM_JMODE 0x0060
568 #define EXT3_DEFM_JMODE_DATA 0x0020
569 #define EXT3_DEFM_JMODE_ORDERED 0x0040
570 #define EXT3_DEFM_JMODE_WBACK 0x0060
573 * Structure of a directory entry
575 #define EXT3_NAME_LEN 255
577 struct ext3_dir_entry {
578 __u32 inode; /* Inode number */
579 __u16 rec_len; /* Directory entry length */
580 __u16 name_len; /* Name length */
581 char name[EXT3_NAME_LEN]; /* File name */
585 * The new version of the directory entry. Since EXT3 structures are
586 * stored in intel byte order, and the name_len field could never be
587 * bigger than 255 chars, it's safe to reclaim the extra byte for the
590 struct ext3_dir_entry_2 {
591 __u32 inode; /* Inode number */
592 __u16 rec_len; /* Directory entry length */
593 __u8 name_len; /* Name length */
595 char name[EXT3_NAME_LEN]; /* File name */
599 * Ext3 directory file types. Only the low 3 bits are used. The
600 * other bits are reserved for now.
602 #define EXT3_FT_UNKNOWN 0
603 #define EXT3_FT_REG_FILE 1
604 #define EXT3_FT_DIR 2
605 #define EXT3_FT_CHRDEV 3
606 #define EXT3_FT_BLKDEV 4
607 #define EXT3_FT_FIFO 5
608 #define EXT3_FT_SOCK 6
609 #define EXT3_FT_SYMLINK 7
611 #define EXT3_FT_MAX 8
614 * EXT3_DIR_PAD defines the directory entries boundaries
616 * NOTE: It must be a multiple of 4
618 #define EXT3_DIR_PAD 4
619 #define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
620 #define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
623 * Hash Tree Directory indexing
624 * (c) Daniel Phillips, 2001
627 #ifdef CONFIG_EXT3_INDEX
628 #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
629 EXT3_FEATURE_COMPAT_DIR_INDEX) && \
630 (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
631 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
632 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
635 #define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
636 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
639 /* Legal values for the dx_root hash_version field: */
641 #define DX_HASH_LEGACY 0
642 #define DX_HASH_HALF_MD4 1
643 #define DX_HASH_TEA 2
645 /* hash info structure used by the directory hash */
654 #define EXT3_HTREE_EOF 0x7fffffff
658 * Control parameters used by ext3_htree_next_block
660 #define HASH_NB_ALWAYS 1
664 * Describe an inode's exact location on disk and in memory
668 struct buffer_head *bh;
669 unsigned long offset;
670 unsigned long block_group;
673 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
675 return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
679 * This structure is stuffed into the struct file's private_data field
680 * for directories. It is where we put information so that we can do
681 * readdir operations in hash tree order.
683 struct dir_private_info {
685 struct rb_node *curr_node;
686 struct fname *extra_fname;
689 __u32 curr_minor_hash;
694 * Special error return code only used by dx_probe() and its callers.
696 #define ERR_BAD_DX_DIR -75000
699 * Function prototypes
703 * Ok, these declarations are also in <linux/kernel.h> but none of the
704 * ext3 source programs needs to include it so they are duplicated here.
706 # define NORET_TYPE /**/
707 # define ATTRIB_NORET __attribute__((noreturn))
708 # define NORET_AND noreturn,
711 extern int ext3_bg_has_super(struct super_block *sb, int group);
712 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
713 extern int ext3_new_block (handle_t *, struct inode *, unsigned long, int *);
714 extern void ext3_free_blocks (handle_t *, struct inode *, unsigned long,
716 extern unsigned long ext3_count_free_blocks (struct super_block *);
717 extern void ext3_check_blocks_bitmap (struct super_block *);
718 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
719 unsigned int block_group,
720 struct buffer_head ** bh);
721 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
724 extern int ext3_check_dir_entry(const char *, struct inode *,
725 struct ext3_dir_entry_2 *,
726 struct buffer_head *, unsigned long);
727 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
729 struct ext3_dir_entry_2 *dirent);
730 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
733 extern int ext3_sync_file (struct file *, struct dentry *, int);
736 extern int ext3fs_dirhash(const char *name, int len, struct
737 dx_hash_info *hinfo);
740 extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
741 extern void ext3_free_inode (handle_t *, struct inode *);
742 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
743 extern unsigned long ext3_count_free_inodes (struct super_block *);
744 extern unsigned long ext3_count_dirs (struct super_block *);
745 extern void ext3_check_inodes_bitmap (struct super_block *);
746 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
750 extern int ext3_forget(handle_t *, int, struct inode *, struct buffer_head *, int);
751 extern struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
752 extern struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
754 extern void ext3_read_inode (struct inode *);
755 extern void ext3_write_inode (struct inode *, int);
756 extern int ext3_setattr (struct dentry *, struct iattr *);
757 extern void ext3_put_inode (struct inode *);
758 extern void ext3_delete_inode (struct inode *);
759 extern int ext3_sync_inode (handle_t *, struct inode *);
760 extern void ext3_discard_prealloc (struct inode *);
761 extern void ext3_discard_reservation (struct inode *);
762 extern void ext3_dirty_inode(struct inode *);
763 extern int ext3_change_inode_journal_flag(struct inode *, int);
764 extern void ext3_truncate (struct inode *);
765 extern void ext3_set_inode_flags(struct inode *);
766 extern void ext3_set_aops(struct inode *inode);
769 extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
773 extern int ext3_orphan_add(handle_t *, struct inode *);
774 extern int ext3_orphan_del(handle_t *, struct inode *);
775 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
776 __u32 start_minor_hash, __u32 *next_hash);
779 extern int ext3_group_add(struct super_block *sb,
780 struct ext3_new_group_data *input);
781 extern int ext3_group_extend(struct super_block *sb,
782 struct ext3_super_block *es,
783 unsigned long n_blocks_count);
786 extern void ext3_error (struct super_block *, const char *, const char *, ...)
787 __attribute__ ((format (printf, 3, 4)));
788 extern void __ext3_std_error (struct super_block *, const char *, int);
789 extern void ext3_abort (struct super_block *, const char *, const char *, ...)
790 __attribute__ ((format (printf, 3, 4)));
791 extern NORET_TYPE void ext3_panic (struct super_block *, const char *,
793 __attribute__ ((NORET_AND format (printf, 3, 4)));
794 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
795 __attribute__ ((format (printf, 3, 4)));
796 extern void ext3_update_dynamic_rev (struct super_block *sb);
797 extern void ext3_put_super (struct super_block *);
798 extern void ext3_write_super (struct super_block *);
799 extern void ext3_write_super_lockfs (struct super_block *);
800 extern void ext3_unlockfs (struct super_block *);
801 extern int ext3_remount (struct super_block *, int *, char *);
802 extern int ext3_statfs (struct super_block *, struct kstatfs *);
804 #define ext3_std_error(sb, errno) \
807 __ext3_std_error((sb), __FUNCTION__, (errno)); \
809 extern const char *ext3_decode_error(struct super_block *sb, int errno, char nbuf[16]);
812 * Inodes and files operations
816 extern struct file_operations ext3_dir_operations;
819 extern struct inode_operations ext3_file_inode_operations;
820 extern struct file_operations ext3_file_operations;
823 extern struct inode_operations ext3_dir_inode_operations;
824 extern struct inode_operations ext3_special_inode_operations;
827 extern struct inode_operations ext3_symlink_inode_operations;
828 extern struct inode_operations ext3_fast_symlink_inode_operations;
831 #endif /* __KERNEL__ */
833 #endif /* _LINUX_EXT3_FS_H */