[PATCH] mark struct inode_operations const 3
[linux-2.6.git] / include / linux / ext4_fs.h
1 /*
2  *  linux/include/linux/ext4_fs.h
3  *
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)
8  *
9  *  from
10  *
11  *  linux/include/linux/minix_fs.h
12  *
13  *  Copyright (C) 1991, 1992  Linus Torvalds
14  */
15
16 #ifndef _LINUX_EXT4_FS_H
17 #define _LINUX_EXT4_FS_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22
23 /*
24  * The second extended filesystem constants/structures
25  */
26
27 /*
28  * Define EXT4FS_DEBUG to produce debug messages
29  */
30 #undef EXT4FS_DEBUG
31
32 /*
33  * Define EXT4_RESERVATION to reserve data blocks for expanding files
34  */
35 #define EXT4_DEFAULT_RESERVE_BLOCKS     8
36 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
37 #define EXT4_MAX_RESERVE_BLOCKS         1027
38 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
39 /*
40  * Always enable hashed directories
41  */
42 #define CONFIG_EXT4_INDEX
43
44 /*
45  * Debug code
46  */
47 #ifdef EXT4FS_DEBUG
48 #define ext4_debug(f, a...)                                             \
49         do {                                                            \
50                 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",       \
51                         __FILE__, __LINE__, __FUNCTION__);              \
52                 printk (KERN_DEBUG f, ## a);                            \
53         } while (0)
54 #else
55 #define ext4_debug(f, a...)     do {} while (0)
56 #endif
57
58 /*
59  * Special inodes numbers
60  */
61 #define EXT4_BAD_INO             1      /* Bad blocks inode */
62 #define EXT4_ROOT_INO            2      /* Root inode */
63 #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
64 #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
65 #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
66 #define EXT4_JOURNAL_INO         8      /* Journal inode */
67
68 /* First non-reserved inode for old ext4 filesystems */
69 #define EXT4_GOOD_OLD_FIRST_INO 11
70
71 /*
72  * Maximal count of links to a file
73  */
74 #define EXT4_LINK_MAX           32000
75
76 /*
77  * Macro-instructions used to manage several block sizes
78  */
79 #define EXT4_MIN_BLOCK_SIZE             1024
80 #define EXT4_MAX_BLOCK_SIZE             4096
81 #define EXT4_MIN_BLOCK_LOG_SIZE           10
82 #ifdef __KERNEL__
83 # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
84 #else
85 # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
86 #endif
87 #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
88 #ifdef __KERNEL__
89 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
90 #else
91 # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
92 #endif
93 #ifdef __KERNEL__
94 #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
95 #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
96 #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
97 #else
98 #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
99                                  EXT4_GOOD_OLD_INODE_SIZE : \
100                                  (s)->s_inode_size)
101 #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
102                                  EXT4_GOOD_OLD_FIRST_INO : \
103                                  (s)->s_first_ino)
104 #endif
105
106 /*
107  * Macro-instructions used to manage fragments
108  */
109 #define EXT4_MIN_FRAG_SIZE              1024
110 #define EXT4_MAX_FRAG_SIZE              4096
111 #define EXT4_MIN_FRAG_LOG_SIZE            10
112 #ifdef __KERNEL__
113 # define EXT4_FRAG_SIZE(s)              (EXT4_SB(s)->s_frag_size)
114 # define EXT4_FRAGS_PER_BLOCK(s)        (EXT4_SB(s)->s_frags_per_block)
115 #else
116 # define EXT4_FRAG_SIZE(s)              (EXT4_MIN_FRAG_SIZE << (s)->s_log_frag_size)
117 # define EXT4_FRAGS_PER_BLOCK(s)        (EXT4_BLOCK_SIZE(s) / EXT4_FRAG_SIZE(s))
118 #endif
119
120 /*
121  * Structure of a blocks group descriptor
122  */
123 struct ext4_group_desc
124 {
125         __le32  bg_block_bitmap;                /* Blocks bitmap block */
126         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
127         __le32  bg_inode_table;         /* Inodes table block */
128         __le16  bg_free_blocks_count;   /* Free blocks count */
129         __le16  bg_free_inodes_count;   /* Free inodes count */
130         __le16  bg_used_dirs_count;     /* Directories count */
131         __u16   bg_flags;
132         __u32   bg_reserved[3];
133         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
134         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
135         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
136 };
137
138 #ifdef __KERNEL__
139 #include <linux/ext4_fs_i.h>
140 #include <linux/ext4_fs_sb.h>
141 #endif
142 /*
143  * Macro-instructions used to manage group descriptors
144  */
145 #define EXT4_MIN_DESC_SIZE              32
146 #define EXT4_MIN_DESC_SIZE_64BIT        64
147 #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
148 #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
149 #ifdef __KERNEL__
150 # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
151 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
152 # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
153 # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
154 #else
155 # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
156 # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
157 # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
158 #endif
159
160 /*
161  * Constants relative to the data blocks
162  */
163 #define EXT4_NDIR_BLOCKS                12
164 #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
165 #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
166 #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
167 #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
168
169 /*
170  * Inode flags
171  */
172 #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
173 #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
174 #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
175 #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
176 #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
177 #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
178 #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
179 #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
180 /* Reserved for compression usage... */
181 #define EXT4_DIRTY_FL                   0x00000100
182 #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
183 #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
184 #define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */
185 /* End compression flags --- maybe not all used */
186 #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
187 #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
188 #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
189 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
190 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
191 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
192 #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
193 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
194
195 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
196 #define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
197
198 /*
199  * Inode dynamic state flags
200  */
201 #define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */
202 #define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */
203 #define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */
204
205 /* Used to pass group descriptor data when online resize is done */
206 struct ext4_new_group_input {
207         __u32 group;            /* Group number for this data */
208         __u64 block_bitmap;     /* Absolute block number of block bitmap */
209         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
210         __u64 inode_table;      /* Absolute block number of inode table start */
211         __u32 blocks_count;     /* Total number of blocks in this group */
212         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
213         __u16 unused;
214 };
215
216 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
217 struct ext4_new_group_data {
218         __u32 group;
219         __u64 block_bitmap;
220         __u64 inode_bitmap;
221         __u64 inode_table;
222         __u32 blocks_count;
223         __u16 reserved_blocks;
224         __u16 unused;
225         __u32 free_blocks_count;
226 };
227
228
229 /*
230  * ioctl commands
231  */
232 #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
233 #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
234 #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
235 #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
236 #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
237 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8,struct ext4_new_group_input)
238 #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
239 #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
240 #ifdef CONFIG_JBD_DEBUG
241 #define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
242 #endif
243 #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
244 #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
245
246 /*
247  * ioctl commands in 32 bit emulation
248  */
249 #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
250 #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
251 #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
252 #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
253 #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
254 #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
255 #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
256 #ifdef CONFIG_JBD_DEBUG
257 #define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
258 #endif
259 #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
260 #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
261
262
263 /*
264  *  Mount options
265  */
266 struct ext4_mount_options {
267         unsigned long s_mount_opt;
268         uid_t s_resuid;
269         gid_t s_resgid;
270         unsigned long s_commit_interval;
271 #ifdef CONFIG_QUOTA
272         int s_jquota_fmt;
273         char *s_qf_names[MAXQUOTAS];
274 #endif
275 };
276
277 /*
278  * Structure of an inode on the disk
279  */
280 struct ext4_inode {
281         __le16  i_mode;         /* File mode */
282         __le16  i_uid;          /* Low 16 bits of Owner Uid */
283         __le32  i_size;         /* Size in bytes */
284         __le32  i_atime;        /* Access time */
285         __le32  i_ctime;        /* Creation time */
286         __le32  i_mtime;        /* Modification time */
287         __le32  i_dtime;        /* Deletion Time */
288         __le16  i_gid;          /* Low 16 bits of Group Id */
289         __le16  i_links_count;  /* Links count */
290         __le32  i_blocks;       /* Blocks count */
291         __le32  i_flags;        /* File flags */
292         union {
293                 struct {
294                         __u32  l_i_reserved1;
295                 } linux1;
296                 struct {
297                         __u32  h_i_translator;
298                 } hurd1;
299                 struct {
300                         __u32  m_i_reserved1;
301                 } masix1;
302         } osd1;                         /* OS dependent 1 */
303         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
304         __le32  i_generation;   /* File version (for NFS) */
305         __le32  i_file_acl;     /* File ACL */
306         __le32  i_dir_acl;      /* Directory ACL */
307         __le32  i_faddr;        /* Fragment address */
308         union {
309                 struct {
310                         __u8    l_i_frag;       /* Fragment number */
311                         __u8    l_i_fsize;      /* Fragment size */
312                         __le16  l_i_file_acl_high;
313                         __le16  l_i_uid_high;   /* these 2 fields    */
314                         __le16  l_i_gid_high;   /* were reserved2[0] */
315                         __u32   l_i_reserved2;
316                 } linux2;
317                 struct {
318                         __u8    h_i_frag;       /* Fragment number */
319                         __u8    h_i_fsize;      /* Fragment size */
320                         __u16   h_i_mode_high;
321                         __u16   h_i_uid_high;
322                         __u16   h_i_gid_high;
323                         __u32   h_i_author;
324                 } hurd2;
325                 struct {
326                         __u8    m_i_frag;       /* Fragment number */
327                         __u8    m_i_fsize;      /* Fragment size */
328                         __le16  m_i_file_acl_high;
329                         __u32   m_i_reserved2[2];
330                 } masix2;
331         } osd2;                         /* OS dependent 2 */
332         __le16  i_extra_isize;
333         __le16  i_pad1;
334 };
335
336 #define i_size_high     i_dir_acl
337
338 #if defined(__KERNEL__) || defined(__linux__)
339 #define i_reserved1     osd1.linux1.l_i_reserved1
340 #define i_frag          osd2.linux2.l_i_frag
341 #define i_fsize         osd2.linux2.l_i_fsize
342 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
343 #define i_uid_low       i_uid
344 #define i_gid_low       i_gid
345 #define i_uid_high      osd2.linux2.l_i_uid_high
346 #define i_gid_high      osd2.linux2.l_i_gid_high
347 #define i_reserved2     osd2.linux2.l_i_reserved2
348
349 #elif defined(__GNU__)
350
351 #define i_translator    osd1.hurd1.h_i_translator
352 #define i_frag          osd2.hurd2.h_i_frag;
353 #define i_fsize         osd2.hurd2.h_i_fsize;
354 #define i_uid_high      osd2.hurd2.h_i_uid_high
355 #define i_gid_high      osd2.hurd2.h_i_gid_high
356 #define i_author        osd2.hurd2.h_i_author
357
358 #elif defined(__masix__)
359
360 #define i_reserved1     osd1.masix1.m_i_reserved1
361 #define i_frag          osd2.masix2.m_i_frag
362 #define i_fsize         osd2.masix2.m_i_fsize
363 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
364 #define i_reserved2     osd2.masix2.m_i_reserved2
365
366 #endif /* defined(__KERNEL__) || defined(__linux__) */
367
368 /*
369  * File system states
370  */
371 #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
372 #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
373 #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
374
375 /*
376  * Mount flags
377  */
378 #define EXT4_MOUNT_CHECK                0x00001 /* Do mount-time checks */
379 #define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
380 #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
381 #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
382 #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
383 #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
384 #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
385 #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
386 #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
387 #define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */
388 #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
389 #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
390 #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
391 #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
392 #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
393 #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
394 #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
395 #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
396 #define EXT4_MOUNT_RESERVATION          0x10000 /* Preallocation */
397 #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
398 #define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */
399 #define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */
400 #define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
401 #define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
402 #define EXT4_MOUNT_EXTENTS              0x400000 /* Extents support */
403
404 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
405 #ifndef _LINUX_EXT2_FS_H
406 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
407 #define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt
408 #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
409                                          EXT4_MOUNT_##opt)
410 #else
411 #define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD
412 #define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT
413 #define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS
414 #endif
415
416 #define ext4_set_bit                    ext2_set_bit
417 #define ext4_set_bit_atomic             ext2_set_bit_atomic
418 #define ext4_clear_bit                  ext2_clear_bit
419 #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
420 #define ext4_test_bit                   ext2_test_bit
421 #define ext4_find_first_zero_bit        ext2_find_first_zero_bit
422 #define ext4_find_next_zero_bit         ext2_find_next_zero_bit
423
424 /*
425  * Maximal mount counts between two filesystem checks
426  */
427 #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
428 #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
429
430 /*
431  * Behaviour when detecting errors
432  */
433 #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
434 #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
435 #define EXT4_ERRORS_PANIC               3       /* Panic */
436 #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
437
438 /*
439  * Structure of the super block
440  */
441 struct ext4_super_block {
442 /*00*/  __le32  s_inodes_count;         /* Inodes count */
443         __le32  s_blocks_count;         /* Blocks count */
444         __le32  s_r_blocks_count;       /* Reserved blocks count */
445         __le32  s_free_blocks_count;    /* Free blocks count */
446 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
447         __le32  s_first_data_block;     /* First Data Block */
448         __le32  s_log_block_size;       /* Block size */
449         __le32  s_log_frag_size;        /* Fragment size */
450 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
451         __le32  s_frags_per_group;      /* # Fragments per group */
452         __le32  s_inodes_per_group;     /* # Inodes per group */
453         __le32  s_mtime;                /* Mount time */
454 /*30*/  __le32  s_wtime;                /* Write time */
455         __le16  s_mnt_count;            /* Mount count */
456         __le16  s_max_mnt_count;        /* Maximal mount count */
457         __le16  s_magic;                /* Magic signature */
458         __le16  s_state;                /* File system state */
459         __le16  s_errors;               /* Behaviour when detecting errors */
460         __le16  s_minor_rev_level;      /* minor revision level */
461 /*40*/  __le32  s_lastcheck;            /* time of last check */
462         __le32  s_checkinterval;        /* max. time between checks */
463         __le32  s_creator_os;           /* OS */
464         __le32  s_rev_level;            /* Revision level */
465 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
466         __le16  s_def_resgid;           /* Default gid for reserved blocks */
467         /*
468          * These fields are for EXT4_DYNAMIC_REV superblocks only.
469          *
470          * Note: the difference between the compatible feature set and
471          * the incompatible feature set is that if there is a bit set
472          * in the incompatible feature set that the kernel doesn't
473          * know about, it should refuse to mount the filesystem.
474          *
475          * e2fsck's requirements are more strict; if it doesn't know
476          * about a feature in either the compatible or incompatible
477          * feature set, it must abort and not try to meddle with
478          * things it doesn't understand...
479          */
480         __le32  s_first_ino;            /* First non-reserved inode */
481         __le16  s_inode_size;           /* size of inode structure */
482         __le16  s_block_group_nr;       /* block group # of this superblock */
483         __le32  s_feature_compat;       /* compatible feature set */
484 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
485         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
486 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
487 /*78*/  char    s_volume_name[16];      /* volume name */
488 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
489 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
490         /*
491          * Performance hints.  Directory preallocation should only
492          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
493          */
494         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
495         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
496         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
497         /*
498          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
499          */
500 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
501 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
502         __le32  s_journal_dev;          /* device number of journal file */
503         __le32  s_last_orphan;          /* start of list of inodes to delete */
504         __le32  s_hash_seed[4];         /* HTREE hash seed */
505         __u8    s_def_hash_version;     /* Default hash version to use */
506         __u8    s_reserved_char_pad;
507         __le16  s_desc_size;            /* size of group descriptor */
508 /*100*/ __le32  s_default_mount_opts;
509         __le32  s_first_meta_bg;        /* First metablock block group */
510         __le32  s_mkfs_time;            /* When the filesystem was created */
511         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
512         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
513 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
514         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
515         __le32  s_free_blocks_count_hi; /* Free blocks count */
516         __u32   s_reserved[169];        /* Padding to the end of the block */
517 };
518
519 #ifdef __KERNEL__
520 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
521 {
522         return sb->s_fs_info;
523 }
524 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
525 {
526         return container_of(inode, struct ext4_inode_info, vfs_inode);
527 }
528
529 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
530 {
531         return ino == EXT4_ROOT_INO ||
532                 ino == EXT4_JOURNAL_INO ||
533                 ino == EXT4_RESIZE_INO ||
534                 (ino >= EXT4_FIRST_INO(sb) &&
535                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
536 }
537 #else
538 /* Assume that user mode programs are passing in an ext4fs superblock, not
539  * a kernel struct super_block.  This will allow us to call the feature-test
540  * macros from user land. */
541 #define EXT4_SB(sb)     (sb)
542 #endif
543
544 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
545
546 /*
547  * Codes for operating systems
548  */
549 #define EXT4_OS_LINUX           0
550 #define EXT4_OS_HURD            1
551 #define EXT4_OS_MASIX           2
552 #define EXT4_OS_FREEBSD         3
553 #define EXT4_OS_LITES           4
554
555 /*
556  * Revision levels
557  */
558 #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
559 #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
560
561 #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
562 #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
563
564 #define EXT4_GOOD_OLD_INODE_SIZE 128
565
566 /*
567  * Feature set definitions
568  */
569
570 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \
571         ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
572 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
573         ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
574 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \
575         ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
576 #define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \
577         EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
578 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \
579         EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
580 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \
581         EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
582 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \
583         EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
584 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
585         EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
586 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
587         EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
588
589 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
590 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
591 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
592 #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
593 #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
594 #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
595
596 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
597 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
598 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
599
600 #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
601 #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
602 #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
603 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
604 #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
605 #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
606 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
607
608 #define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
609 #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
610                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
611                                          EXT4_FEATURE_INCOMPAT_META_BG| \
612                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
613                                          EXT4_FEATURE_INCOMPAT_64BIT)
614 #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
615                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
616                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
617
618 /*
619  * Default values for user and/or group using reserved blocks
620  */
621 #define EXT4_DEF_RESUID         0
622 #define EXT4_DEF_RESGID         0
623
624 /*
625  * Default mount options
626  */
627 #define EXT4_DEFM_DEBUG         0x0001
628 #define EXT4_DEFM_BSDGROUPS     0x0002
629 #define EXT4_DEFM_XATTR_USER    0x0004
630 #define EXT4_DEFM_ACL           0x0008
631 #define EXT4_DEFM_UID16         0x0010
632 #define EXT4_DEFM_JMODE         0x0060
633 #define EXT4_DEFM_JMODE_DATA    0x0020
634 #define EXT4_DEFM_JMODE_ORDERED 0x0040
635 #define EXT4_DEFM_JMODE_WBACK   0x0060
636
637 /*
638  * Structure of a directory entry
639  */
640 #define EXT4_NAME_LEN 255
641
642 struct ext4_dir_entry {
643         __le32  inode;                  /* Inode number */
644         __le16  rec_len;                /* Directory entry length */
645         __le16  name_len;               /* Name length */
646         char    name[EXT4_NAME_LEN];    /* File name */
647 };
648
649 /*
650  * The new version of the directory entry.  Since EXT4 structures are
651  * stored in intel byte order, and the name_len field could never be
652  * bigger than 255 chars, it's safe to reclaim the extra byte for the
653  * file_type field.
654  */
655 struct ext4_dir_entry_2 {
656         __le32  inode;                  /* Inode number */
657         __le16  rec_len;                /* Directory entry length */
658         __u8    name_len;               /* Name length */
659         __u8    file_type;
660         char    name[EXT4_NAME_LEN];    /* File name */
661 };
662
663 /*
664  * Ext4 directory file types.  Only the low 3 bits are used.  The
665  * other bits are reserved for now.
666  */
667 #define EXT4_FT_UNKNOWN         0
668 #define EXT4_FT_REG_FILE        1
669 #define EXT4_FT_DIR             2
670 #define EXT4_FT_CHRDEV          3
671 #define EXT4_FT_BLKDEV          4
672 #define EXT4_FT_FIFO            5
673 #define EXT4_FT_SOCK            6
674 #define EXT4_FT_SYMLINK         7
675
676 #define EXT4_FT_MAX             8
677
678 /*
679  * EXT4_DIR_PAD defines the directory entries boundaries
680  *
681  * NOTE: It must be a multiple of 4
682  */
683 #define EXT4_DIR_PAD                    4
684 #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
685 #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
686                                          ~EXT4_DIR_ROUND)
687 /*
688  * Hash Tree Directory indexing
689  * (c) Daniel Phillips, 2001
690  */
691
692 #ifdef CONFIG_EXT4_INDEX
693   #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
694                                               EXT4_FEATURE_COMPAT_DIR_INDEX) && \
695                       (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
696 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
697 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
698 #else
699   #define is_dx(dir) 0
700 #define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
701 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
702 #endif
703
704 /* Legal values for the dx_root hash_version field: */
705
706 #define DX_HASH_LEGACY          0
707 #define DX_HASH_HALF_MD4        1
708 #define DX_HASH_TEA             2
709
710 #ifdef __KERNEL__
711
712 /* hash info structure used by the directory hash */
713 struct dx_hash_info
714 {
715         u32             hash;
716         u32             minor_hash;
717         int             hash_version;
718         u32             *seed;
719 };
720
721 #define EXT4_HTREE_EOF  0x7fffffff
722
723 /*
724  * Control parameters used by ext4_htree_next_block
725  */
726 #define HASH_NB_ALWAYS          1
727
728
729 /*
730  * Describe an inode's exact location on disk and in memory
731  */
732 struct ext4_iloc
733 {
734         struct buffer_head *bh;
735         unsigned long offset;
736         unsigned long block_group;
737 };
738
739 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
740 {
741         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
742 }
743
744 /*
745  * This structure is stuffed into the struct file's private_data field
746  * for directories.  It is where we put information so that we can do
747  * readdir operations in hash tree order.
748  */
749 struct dir_private_info {
750         struct rb_root  root;
751         struct rb_node  *curr_node;
752         struct fname    *extra_fname;
753         loff_t          last_pos;
754         __u32           curr_hash;
755         __u32           curr_minor_hash;
756         __u32           next_hash;
757 };
758
759 /* calculate the first block number of the group */
760 static inline ext4_fsblk_t
761 ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
762 {
763         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
764                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
765 }
766
767 /*
768  * Special error return code only used by dx_probe() and its callers.
769  */
770 #define ERR_BAD_DX_DIR  -75000
771
772 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
773                         unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
774
775 /*
776  * Function prototypes
777  */
778
779 /*
780  * Ok, these declarations are also in <linux/kernel.h> but none of the
781  * ext4 source programs needs to include it so they are duplicated here.
782  */
783 # define NORET_TYPE    /**/
784 # define ATTRIB_NORET  __attribute__((noreturn))
785 # define NORET_AND     noreturn,
786
787 /* balloc.c */
788 extern unsigned int ext4_block_group(struct super_block *sb,
789                         ext4_fsblk_t blocknr);
790 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
791                         ext4_fsblk_t blocknr);
792 extern int ext4_bg_has_super(struct super_block *sb, int group);
793 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
794 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
795                         ext4_fsblk_t goal, int *errp);
796 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
797                         ext4_fsblk_t goal, unsigned long *count, int *errp);
798 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
799                         ext4_fsblk_t block, unsigned long count);
800 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
801                                  ext4_fsblk_t block, unsigned long count,
802                                 unsigned long *pdquot_freed_blocks);
803 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
804 extern void ext4_check_blocks_bitmap (struct super_block *);
805 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
806                                                     unsigned int block_group,
807                                                     struct buffer_head ** bh);
808 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
809 extern void ext4_init_block_alloc_info(struct inode *);
810 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
811
812 /* dir.c */
813 extern int ext4_check_dir_entry(const char *, struct inode *,
814                                 struct ext4_dir_entry_2 *,
815                                 struct buffer_head *, unsigned long);
816 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
817                                     __u32 minor_hash,
818                                     struct ext4_dir_entry_2 *dirent);
819 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
820
821 /* fsync.c */
822 extern int ext4_sync_file (struct file *, struct dentry *, int);
823
824 /* hash.c */
825 extern int ext4fs_dirhash(const char *name, int len, struct
826                           dx_hash_info *hinfo);
827
828 /* ialloc.c */
829 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
830 extern void ext4_free_inode (handle_t *, struct inode *);
831 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
832 extern unsigned long ext4_count_free_inodes (struct super_block *);
833 extern unsigned long ext4_count_dirs (struct super_block *);
834 extern void ext4_check_inodes_bitmap (struct super_block *);
835 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
836
837
838 /* inode.c */
839 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
840                 struct buffer_head *bh, ext4_fsblk_t blocknr);
841 struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
842 struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
843 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
844         sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
845         int create, int extend_disksize);
846
847 extern void ext4_read_inode (struct inode *);
848 extern int  ext4_write_inode (struct inode *, int);
849 extern int  ext4_setattr (struct dentry *, struct iattr *);
850 extern void ext4_delete_inode (struct inode *);
851 extern int  ext4_sync_inode (handle_t *, struct inode *);
852 extern void ext4_discard_reservation (struct inode *);
853 extern void ext4_dirty_inode(struct inode *);
854 extern int ext4_change_inode_journal_flag(struct inode *, int);
855 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
856 extern void ext4_truncate (struct inode *);
857 extern void ext4_set_inode_flags(struct inode *);
858 extern void ext4_set_aops(struct inode *inode);
859 extern int ext4_writepage_trans_blocks(struct inode *);
860 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
861                 struct address_space *mapping, loff_t from);
862
863 /* ioctl.c */
864 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
865                        unsigned long);
866 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
867
868 /* namei.c */
869 extern int ext4_orphan_add(handle_t *, struct inode *);
870 extern int ext4_orphan_del(handle_t *, struct inode *);
871 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
872                                 __u32 start_minor_hash, __u32 *next_hash);
873
874 /* resize.c */
875 extern int ext4_group_add(struct super_block *sb,
876                                 struct ext4_new_group_data *input);
877 extern int ext4_group_extend(struct super_block *sb,
878                                 struct ext4_super_block *es,
879                                 ext4_fsblk_t n_blocks_count);
880
881 /* super.c */
882 extern void ext4_error (struct super_block *, const char *, const char *, ...)
883         __attribute__ ((format (printf, 3, 4)));
884 extern void __ext4_std_error (struct super_block *, const char *, int);
885 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
886         __attribute__ ((format (printf, 3, 4)));
887 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
888         __attribute__ ((format (printf, 3, 4)));
889 extern void ext4_update_dynamic_rev (struct super_block *sb);
890 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
891                                       struct ext4_group_desc *bg);
892 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
893                                       struct ext4_group_desc *bg);
894 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
895                                      struct ext4_group_desc *bg);
896 extern void ext4_block_bitmap_set(struct super_block *sb,
897                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
898 extern void ext4_inode_bitmap_set(struct super_block *sb,
899                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
900 extern void ext4_inode_table_set(struct super_block *sb,
901                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
902
903 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
904 {
905         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
906                 le32_to_cpu(es->s_blocks_count);
907 }
908
909 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
910 {
911         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
912                 le32_to_cpu(es->s_r_blocks_count);
913 }
914
915 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
916 {
917         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
918                 le32_to_cpu(es->s_free_blocks_count);
919 }
920
921 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
922                                          ext4_fsblk_t blk)
923 {
924         es->s_blocks_count = cpu_to_le32((u32)blk);
925         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
926 }
927
928 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
929                                               ext4_fsblk_t blk)
930 {
931         es->s_free_blocks_count = cpu_to_le32((u32)blk);
932         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
933 }
934
935 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
936                                            ext4_fsblk_t blk)
937 {
938         es->s_r_blocks_count = cpu_to_le32((u32)blk);
939         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
940 }
941
942
943
944 #define ext4_std_error(sb, errno)                               \
945 do {                                                            \
946         if ((errno))                                            \
947                 __ext4_std_error((sb), __FUNCTION__, (errno));  \
948 } while (0)
949
950 /*
951  * Inodes and files operations
952  */
953
954 /* dir.c */
955 extern const struct file_operations ext4_dir_operations;
956
957 /* file.c */
958 extern const struct inode_operations ext4_file_inode_operations;
959 extern const struct file_operations ext4_file_operations;
960
961 /* namei.c */
962 extern const struct inode_operations ext4_dir_inode_operations;
963 extern const struct inode_operations ext4_special_inode_operations;
964
965 /* symlink.c */
966 extern const struct inode_operations ext4_symlink_inode_operations;
967 extern const struct inode_operations ext4_fast_symlink_inode_operations;
968
969 /* extents.c */
970 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
971 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
972 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
973                         ext4_fsblk_t iblock,
974                         unsigned long max_blocks, struct buffer_head *bh_result,
975                         int create, int extend_disksize);
976 extern void ext4_ext_truncate(struct inode *, struct page *);
977 extern void ext4_ext_init(struct super_block *);
978 extern void ext4_ext_release(struct super_block *);
979 static inline int
980 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
981                         unsigned long max_blocks, struct buffer_head *bh,
982                         int create, int extend_disksize)
983 {
984         if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
985                 return ext4_ext_get_blocks(handle, inode, block, max_blocks,
986                                         bh, create, extend_disksize);
987         return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
988                                         create, extend_disksize);
989 }
990
991
992 #endif  /* __KERNEL__ */
993
994 #endif  /* _LINUX_EXT4_FS_H */