2 * linux/include/linux/ext2_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_EXT2_FS_H
17 #define _LINUX_EXT2_FS_H
20 * The second extended filesystem constants/structures
24 * Define EXT2FS_DEBUG to produce debug messages
29 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
31 #define EXT2_PREALLOCATE
32 #define EXT2_DEFAULT_PREALLOC_BLOCKS 8
35 * The second extended file system version
37 #define EXT2FS_DATE "95/08/09"
38 #define EXT2FS_VERSION "0.5b"
44 # define ext2_debug(f, a...) { \
45 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
46 __FILE__, __LINE__, __FUNCTION__); \
50 # define ext2_debug(f, a...) /**/
54 * Special inodes numbers
56 #define EXT2_BAD_INO 1 /* Bad blocks inode */
57 #define EXT2_ROOT_INO 2 /* Root inode */
58 #define EXT2_ACL_IDX_INO 3 /* ACL inode */
59 #define EXT2_ACL_DATA_INO 4 /* ACL inode */
60 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
61 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
63 /* First non-reserved inode for old ext2 filesystems */
64 #define EXT2_GOOD_OLD_FIRST_INO 11
67 * The second extended file system magic number
69 #define EXT2_SUPER_MAGIC 0xEF53
72 * Maximal count of links to a file
74 #define EXT2_LINK_MAX 32000
77 * Macro-instructions used to manage several block sizes
79 #define EXT2_MIN_BLOCK_SIZE 1024
80 #define EXT2_MAX_BLOCK_SIZE 4096
81 #define EXT2_MIN_BLOCK_LOG_SIZE 10
83 # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
85 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
87 #define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
88 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
90 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
92 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
95 #define EXT2_ADDR_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_addr_per_block_bits)
96 #define EXT2_INODE_SIZE(s) ((s)->u.ext2_sb.s_inode_size)
97 #define EXT2_FIRST_INO(s) ((s)->u.ext2_sb.s_first_ino)
99 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
100 EXT2_GOOD_OLD_INODE_SIZE : \
102 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
103 EXT2_GOOD_OLD_FIRST_INO : \
108 * Macro-instructions used to manage fragments
110 #define EXT2_MIN_FRAG_SIZE 1024
111 #define EXT2_MAX_FRAG_SIZE 4096
112 #define EXT2_MIN_FRAG_LOG_SIZE 10
114 # define EXT2_FRAG_SIZE(s) ((s)->u.ext2_sb.s_frag_size)
115 # define EXT2_FRAGS_PER_BLOCK(s) ((s)->u.ext2_sb.s_frags_per_block)
117 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
118 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
124 struct ext2_acl_header /* Header of Access Control Lists */
127 __u32 aclh_file_count;
128 __u32 aclh_acle_count;
129 __u32 aclh_first_acle;
132 struct ext2_acl_entry /* Access Control List Entry */
135 __u16 acle_perms; /* Access permissions */
136 __u16 acle_type; /* Type of entry */
137 __u16 acle_tag; /* User or group identity */
139 __u32 acle_next; /* Pointer on next entry for the */
140 /* same inode or on next free entry */
144 * Structure of a blocks group descriptor
146 struct ext2_group_desc
148 __u32 bg_block_bitmap; /* Blocks bitmap block */
149 __u32 bg_inode_bitmap; /* Inodes bitmap block */
150 __u32 bg_inode_table; /* Inodes table block */
151 __u16 bg_free_blocks_count; /* Free blocks count */
152 __u16 bg_free_inodes_count; /* Free inodes count */
153 __u16 bg_used_dirs_count; /* Directories count */
155 __u32 bg_reserved[3];
159 * Macro-instructions used to manage group descriptors
162 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->u.ext2_sb.s_blocks_per_group)
163 # define EXT2_DESC_PER_BLOCK(s) ((s)->u.ext2_sb.s_desc_per_block)
164 # define EXT2_INODES_PER_GROUP(s) ((s)->u.ext2_sb.s_inodes_per_group)
165 # define EXT2_DESC_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_desc_per_block_bits)
167 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
168 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
169 # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
173 * Constants relative to the data blocks
175 #define EXT2_NDIR_BLOCKS 12
176 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
177 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
178 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
179 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
184 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
185 #define EXT2_UNRM_FL 0x00000002 /* Undelete */
186 #define EXT2_COMPR_FL 0x00000004 /* Compress file */
187 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
188 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
189 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
190 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
191 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
192 /* Reserved for compression usage... */
193 #define EXT2_DIRTY_FL 0x00000100
194 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
195 #define EXT2_NOCOMP_FL 0x00000400 /* Don't compress */
196 #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
197 /* End compression flags --- maybe not all used */
198 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */
199 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
201 #define EXT2_FL_USER_VISIBLE 0x00001FFF /* User visible flags */
202 #define EXT2_FL_USER_MODIFIABLE 0x000000FF /* User modifiable flags */
207 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
208 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
209 #define EXT2_IOC_GETVERSION _IOR('v', 1, long)
210 #define EXT2_IOC_SETVERSION _IOW('v', 2, long)
213 * Structure of an inode on the disk
216 __u16 i_mode; /* File mode */
217 __u16 i_uid; /* Low 16 bits of Owner Uid */
218 __u32 i_size; /* Size in bytes */
219 __u32 i_atime; /* Access time */
220 __u32 i_ctime; /* Creation time */
221 __u32 i_mtime; /* Modification time */
222 __u32 i_dtime; /* Deletion Time */
223 __u16 i_gid; /* Low 16 bits of Group Id */
224 __u16 i_links_count; /* Links count */
225 __u32 i_blocks; /* Blocks count */
226 __u32 i_flags; /* File flags */
232 __u32 h_i_translator;
237 } osd1; /* OS dependent 1 */
238 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
239 __u32 i_generation; /* File version (for NFS) */
240 __u32 i_file_acl; /* File ACL */
241 __u32 i_dir_acl; /* Directory ACL */
242 __u32 i_faddr; /* Fragment address */
245 __u8 l_i_frag; /* Fragment number */
246 __u8 l_i_fsize; /* Fragment size */
248 __u16 l_i_uid_high; /* these 2 fields */
249 __u16 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
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
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
301 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
302 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
307 #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */
308 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
309 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
310 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
311 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
312 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
313 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
314 #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */
316 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
317 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
318 #define test_opt(sb, opt) ((sb)->u.ext2_sb.s_mount_opt & \
321 * Maximal mount counts between two filesystem checks
323 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
324 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
327 * Behaviour when detecting errors
329 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
330 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
331 #define EXT2_ERRORS_PANIC 3 /* Panic */
332 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
335 * Structure of the super block
337 struct ext2_super_block {
338 __u32 s_inodes_count; /* Inodes count */
339 __u32 s_blocks_count; /* Blocks count */
340 __u32 s_r_blocks_count; /* Reserved blocks count */
341 __u32 s_free_blocks_count; /* Free blocks count */
342 __u32 s_free_inodes_count; /* Free inodes count */
343 __u32 s_first_data_block; /* First Data Block */
344 __u32 s_log_block_size; /* Block size */
345 __s32 s_log_frag_size; /* Fragment size */
346 __u32 s_blocks_per_group; /* # Blocks per group */
347 __u32 s_frags_per_group; /* # Fragments per group */
348 __u32 s_inodes_per_group; /* # Inodes per group */
349 __u32 s_mtime; /* Mount time */
350 __u32 s_wtime; /* Write time */
351 __u16 s_mnt_count; /* Mount count */
352 __s16 s_max_mnt_count; /* Maximal mount count */
353 __u16 s_magic; /* Magic signature */
354 __u16 s_state; /* File system state */
355 __u16 s_errors; /* Behaviour when detecting errors */
356 __u16 s_minor_rev_level; /* minor revision level */
357 __u32 s_lastcheck; /* time of last check */
358 __u32 s_checkinterval; /* max. time between checks */
359 __u32 s_creator_os; /* OS */
360 __u32 s_rev_level; /* Revision level */
361 __u16 s_def_resuid; /* Default uid for reserved blocks */
362 __u16 s_def_resgid; /* Default gid for reserved blocks */
364 * These fields are for EXT2_DYNAMIC_REV superblocks only.
366 * Note: the difference between the compatible feature set and
367 * the incompatible feature set is that if there is a bit set
368 * in the incompatible feature set that the kernel doesn't
369 * know about, it should refuse to mount the filesystem.
371 * e2fsck's requirements are more strict; if it doesn't know
372 * about a feature in either the compatible or incompatible
373 * feature set, it must abort and not try to meddle with
374 * things it doesn't understand...
376 __u32 s_first_ino; /* First non-reserved inode */
377 __u16 s_inode_size; /* size of inode structure */
378 __u16 s_block_group_nr; /* block group # of this superblock */
379 __u32 s_feature_compat; /* compatible feature set */
380 __u32 s_feature_incompat; /* incompatible feature set */
381 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
382 __u8 s_uuid[16]; /* 128-bit uuid for volume */
383 char s_volume_name[16]; /* volume name */
384 char s_last_mounted[64]; /* directory where last mounted */
385 __u32 s_algorithm_usage_bitmap; /* For compression */
387 * Performance hints. Directory preallocation should only
388 * happen if the EXT2_COMPAT_PREALLOC flag is on.
390 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
391 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
393 __u32 s_reserved[204]; /* Padding to the end of the block */
397 #define EXT2_SB(sb) (&((sb)->u.ext2_sb))
399 /* Assume that user mode programs are passing in an ext2fs superblock, not
400 * a kernel struct super_block. This will allow us to call the feature-test
401 * macros from user land. */
402 #define EXT2_SB(sb) (sb)
406 * Codes for operating systems
408 #define EXT2_OS_LINUX 0
409 #define EXT2_OS_HURD 1
410 #define EXT2_OS_MASIX 2
411 #define EXT2_OS_FREEBSD 3
412 #define EXT2_OS_LITES 4
417 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
418 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
420 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
421 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
423 #define EXT2_GOOD_OLD_INODE_SIZE 128
426 * Feature set definitions
429 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
430 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
431 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
432 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
433 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
434 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
435 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \
436 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
437 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
438 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
439 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
440 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
441 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
442 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
443 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
444 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
445 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
446 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
448 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
450 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
451 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
452 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
454 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
455 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
457 #define EXT2_FEATURE_COMPAT_SUPP 0
458 #define EXT2_FEATURE_INCOMPAT_SUPP EXT2_FEATURE_INCOMPAT_FILETYPE
459 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
460 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
461 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
464 * Default values for user and/or group using reserved blocks
466 #define EXT2_DEF_RESUID 0
467 #define EXT2_DEF_RESGID 0
470 * Structure of a directory entry
472 #define EXT2_NAME_LEN 255
474 struct ext2_dir_entry {
475 __u32 inode; /* Inode number */
476 __u16 rec_len; /* Directory entry length */
477 __u16 name_len; /* Name length */
478 char name[EXT2_NAME_LEN]; /* File name */
482 * The new version of the directory entry. Since EXT2 structures are
483 * stored in intel byte order, and the name_len field could never be
484 * bigger than 255 chars, it's safe to reclaim the extra byte for the
487 struct ext2_dir_entry_2 {
488 __u32 inode; /* Inode number */
489 __u16 rec_len; /* Directory entry length */
490 __u8 name_len; /* Name length */
492 char name[EXT2_NAME_LEN]; /* File name */
496 * Ext2 directory file types. Only the low 3 bits are used. The
497 * other bits are reserved for now.
499 #define EXT2_FT_UNKNOWN 0
500 #define EXT2_FT_REG_FILE 1
501 #define EXT2_FT_DIR 2
502 #define EXT2_FT_CHRDEV 3
503 #define EXT2_FT_BLKDEV 4
504 #define EXT2_FT_FIFO 5
505 #define EXT2_FT_SOCK 6
506 #define EXT2_FT_SYMLINK 7
508 #define EXT2_FT_MAX 8
511 * EXT2_DIR_PAD defines the directory entries boundaries
513 * NOTE: It must be a multiple of 4
515 #define EXT2_DIR_PAD 4
516 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
517 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
522 * Function prototypes
526 * Ok, these declarations are also in <linux/kernel.h> but none of the
527 * ext2 source programs needs to include it so they are duplicated here.
529 # define NORET_TYPE /**/
530 # define ATTRIB_NORET __attribute__((noreturn))
531 # define NORET_AND noreturn,
534 extern int ext2_permission (struct inode *, int);
537 extern int ext2_bg_has_super(struct super_block *sb, int group);
538 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
539 extern int ext2_new_block (const struct inode *, unsigned long,
540 __u32 *, __u32 *, int *);
541 extern void ext2_free_blocks (const struct inode *, unsigned long,
543 extern unsigned long ext2_count_free_blocks (struct super_block *);
544 extern void ext2_check_blocks_bitmap (struct super_block *);
545 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
546 unsigned int block_group,
547 struct buffer_head ** bh);
550 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
553 extern int ext2_check_dir_entry (const char *, struct inode *,
554 struct ext2_dir_entry_2 *, struct buffer_head *,
558 extern int ext2_read (struct inode *, struct file *, char *, int);
559 extern int ext2_write (struct inode *, struct file *, char *, int);
562 extern int ext2_sync_file (struct file *, struct dentry *, int);
563 extern int ext2_fsync_inode (struct inode *, int);
566 extern struct inode * ext2_new_inode (const struct inode *, int);
567 extern void ext2_free_inode (struct inode *);
568 extern unsigned long ext2_count_free_inodes (struct super_block *);
569 extern void ext2_check_inodes_bitmap (struct super_block *);
573 extern struct buffer_head * ext2_getblk (struct inode *, long, int, int *);
574 extern struct buffer_head * ext2_bread (struct inode *, int, int, int *);
576 extern void ext2_read_inode (struct inode *);
577 extern void ext2_write_inode (struct inode *, int);
578 extern void ext2_put_inode (struct inode *);
579 extern void ext2_delete_inode (struct inode *);
580 extern int ext2_sync_inode (struct inode *);
581 extern void ext2_discard_prealloc (struct inode *);
584 extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
588 extern struct inode_operations ext2_dir_inode_operations;
591 extern void ext2_error (struct super_block *, const char *, const char *, ...)
592 __attribute__ ((format (printf, 3, 4)));
593 extern NORET_TYPE void ext2_panic (struct super_block *, const char *,
595 __attribute__ ((NORET_AND format (printf, 3, 4)));
596 extern void ext2_warning (struct super_block *, const char *, const char *, ...)
597 __attribute__ ((format (printf, 3, 4)));
598 extern void ext2_update_dynamic_rev (struct super_block *sb);
599 extern void ext2_put_super (struct super_block *);
600 extern void ext2_write_super (struct super_block *);
601 extern int ext2_remount (struct super_block *, int *, char *);
602 extern struct super_block * ext2_read_super (struct super_block *,void *,int);
603 extern int ext2_statfs (struct super_block *, struct statfs *);
606 extern void ext2_truncate (struct inode *);
609 * Inodes and files operations
613 extern struct file_operations ext2_dir_operations;
616 extern struct inode_operations ext2_file_inode_operations;
617 extern struct file_operations ext2_file_operations;
620 extern struct inode_operations ext2_fast_symlink_inode_operations;
622 extern struct address_space_operations ext2_aops;
624 #endif /* __KERNEL__ */
626 #endif /* _LINUX_EXT2_FS_H */