user namespace: add the framework
[linux-2.6.git] / include / linux / ext3_fs.h
1 /*
2  *  linux/include/linux/ext3_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_EXT3_FS_H
17 #define _LINUX_EXT3_FS_H
18
19 #include <linux/types.h>
20 #include <linux/magic.h>
21
22 /*
23  * The second extended filesystem constants/structures
24  */
25
26 /*
27  * Define EXT3FS_DEBUG to produce debug messages
28  */
29 #undef EXT3FS_DEBUG
30
31 /*
32  * Define EXT3_RESERVATION to reserve data blocks for expanding files
33  */
34 #define EXT3_DEFAULT_RESERVE_BLOCKS     8
35 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
36 #define EXT3_MAX_RESERVE_BLOCKS         1027
37 #define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
38 /*
39  * Always enable hashed directories
40  */
41 #define CONFIG_EXT3_INDEX
42
43 /*
44  * Debug code
45  */
46 #ifdef EXT3FS_DEBUG
47 #define ext3_debug(f, a...)                                             \
48         do {                                                            \
49                 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:",       \
50                         __FILE__, __LINE__, __FUNCTION__);              \
51                 printk (KERN_DEBUG f, ## a);                            \
52         } while (0)
53 #else
54 #define ext3_debug(f, a...)     do {} while (0)
55 #endif
56
57 /*
58  * Special inodes numbers
59  */
60 #define EXT3_BAD_INO             1      /* Bad blocks inode */
61 #define EXT3_ROOT_INO            2      /* Root inode */
62 #define EXT3_BOOT_LOADER_INO     5      /* Boot loader inode */
63 #define EXT3_UNDEL_DIR_INO       6      /* Undelete directory inode */
64 #define EXT3_RESIZE_INO          7      /* Reserved group descriptors inode */
65 #define EXT3_JOURNAL_INO         8      /* Journal inode */
66
67 /* First non-reserved inode for old ext3 filesystems */
68 #define EXT3_GOOD_OLD_FIRST_INO 11
69
70 /*
71  * Maximal count of links to a file
72  */
73 #define EXT3_LINK_MAX           32000
74
75 /*
76  * Macro-instructions used to manage several block sizes
77  */
78 #define EXT3_MIN_BLOCK_SIZE             1024
79 #define EXT3_MAX_BLOCK_SIZE             4096
80 #define EXT3_MIN_BLOCK_LOG_SIZE           10
81 #ifdef __KERNEL__
82 # define EXT3_BLOCK_SIZE(s)             ((s)->s_blocksize)
83 #else
84 # define EXT3_BLOCK_SIZE(s)             (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
85 #endif
86 #define EXT3_ADDR_PER_BLOCK(s)          (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
87 #ifdef __KERNEL__
88 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
89 #else
90 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
91 #endif
92 #ifdef __KERNEL__
93 #define EXT3_ADDR_PER_BLOCK_BITS(s)     (EXT3_SB(s)->s_addr_per_block_bits)
94 #define EXT3_INODE_SIZE(s)              (EXT3_SB(s)->s_inode_size)
95 #define EXT3_FIRST_INO(s)               (EXT3_SB(s)->s_first_ino)
96 #else
97 #define EXT3_INODE_SIZE(s)      (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
98                                  EXT3_GOOD_OLD_INODE_SIZE : \
99                                  (s)->s_inode_size)
100 #define EXT3_FIRST_INO(s)       (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
101                                  EXT3_GOOD_OLD_FIRST_INO : \
102                                  (s)->s_first_ino)
103 #endif
104
105 /*
106  * Macro-instructions used to manage fragments
107  */
108 #define EXT3_MIN_FRAG_SIZE              1024
109 #define EXT3_MAX_FRAG_SIZE              4096
110 #define EXT3_MIN_FRAG_LOG_SIZE            10
111 #ifdef __KERNEL__
112 # define EXT3_FRAG_SIZE(s)              (EXT3_SB(s)->s_frag_size)
113 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_SB(s)->s_frags_per_block)
114 #else
115 # define EXT3_FRAG_SIZE(s)              (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
116 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
117 #endif
118
119 /*
120  * Structure of a blocks group descriptor
121  */
122 struct ext3_group_desc
123 {
124         __le32  bg_block_bitmap;                /* Blocks bitmap block */
125         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
126         __le32  bg_inode_table;         /* Inodes table block */
127         __le16  bg_free_blocks_count;   /* Free blocks count */
128         __le16  bg_free_inodes_count;   /* Free inodes count */
129         __le16  bg_used_dirs_count;     /* Directories count */
130         __u16   bg_pad;
131         __le32  bg_reserved[3];
132 };
133
134 /*
135  * Macro-instructions used to manage group descriptors
136  */
137 #ifdef __KERNEL__
138 # define EXT3_BLOCKS_PER_GROUP(s)       (EXT3_SB(s)->s_blocks_per_group)
139 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_SB(s)->s_desc_per_block)
140 # define EXT3_INODES_PER_GROUP(s)       (EXT3_SB(s)->s_inodes_per_group)
141 # define EXT3_DESC_PER_BLOCK_BITS(s)    (EXT3_SB(s)->s_desc_per_block_bits)
142 #else
143 # define EXT3_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
144 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
145 # define EXT3_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
146 #endif
147
148 /*
149  * Constants relative to the data blocks
150  */
151 #define EXT3_NDIR_BLOCKS                12
152 #define EXT3_IND_BLOCK                  EXT3_NDIR_BLOCKS
153 #define EXT3_DIND_BLOCK                 (EXT3_IND_BLOCK + 1)
154 #define EXT3_TIND_BLOCK                 (EXT3_DIND_BLOCK + 1)
155 #define EXT3_N_BLOCKS                   (EXT3_TIND_BLOCK + 1)
156
157 /*
158  * Inode flags
159  */
160 #define EXT3_SECRM_FL                   0x00000001 /* Secure deletion */
161 #define EXT3_UNRM_FL                    0x00000002 /* Undelete */
162 #define EXT3_COMPR_FL                   0x00000004 /* Compress file */
163 #define EXT3_SYNC_FL                    0x00000008 /* Synchronous updates */
164 #define EXT3_IMMUTABLE_FL               0x00000010 /* Immutable file */
165 #define EXT3_APPEND_FL                  0x00000020 /* writes to file may only append */
166 #define EXT3_NODUMP_FL                  0x00000040 /* do not dump file */
167 #define EXT3_NOATIME_FL                 0x00000080 /* do not update atime */
168 /* Reserved for compression usage... */
169 #define EXT3_DIRTY_FL                   0x00000100
170 #define EXT3_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
171 #define EXT3_NOCOMPR_FL                 0x00000400 /* Don't compress */
172 #define EXT3_ECOMPR_FL                  0x00000800 /* Compression error */
173 /* End compression flags --- maybe not all used */
174 #define EXT3_INDEX_FL                   0x00001000 /* hash-indexed directory */
175 #define EXT3_IMAGIC_FL                  0x00002000 /* AFS directory */
176 #define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
177 #define EXT3_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
178 #define EXT3_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
179 #define EXT3_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
180 #define EXT3_RESERVED_FL                0x80000000 /* reserved for ext3 lib */
181
182 #define EXT3_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
183 #define EXT3_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
184
185 /*
186  * Inode dynamic state flags
187  */
188 #define EXT3_STATE_JDATA                0x00000001 /* journaled data exists */
189 #define EXT3_STATE_NEW                  0x00000002 /* inode is newly created */
190 #define EXT3_STATE_XATTR                0x00000004 /* has in-inode xattrs */
191
192 /* Used to pass group descriptor data when online resize is done */
193 struct ext3_new_group_input {
194         __u32 group;            /* Group number for this data */
195         __u32 block_bitmap;     /* Absolute block number of block bitmap */
196         __u32 inode_bitmap;     /* Absolute block number of inode bitmap */
197         __u32 inode_table;      /* Absolute block number of inode table start */
198         __u32 blocks_count;     /* Total number of blocks in this group */
199         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
200         __u16 unused;
201 };
202
203 /* The struct ext3_new_group_input in kernel space, with free_blocks_count */
204 struct ext3_new_group_data {
205         __u32 group;
206         __u32 block_bitmap;
207         __u32 inode_bitmap;
208         __u32 inode_table;
209         __u32 blocks_count;
210         __u16 reserved_blocks;
211         __u16 unused;
212         __u32 free_blocks_count;
213 };
214
215
216 /*
217  * ioctl commands
218  */
219 #define EXT3_IOC_GETFLAGS               FS_IOC_GETFLAGS
220 #define EXT3_IOC_SETFLAGS               FS_IOC_SETFLAGS
221 #define EXT3_IOC_GETVERSION             _IOR('f', 3, long)
222 #define EXT3_IOC_SETVERSION             _IOW('f', 4, long)
223 #define EXT3_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
224 #define EXT3_IOC_GROUP_ADD              _IOW('f', 8,struct ext3_new_group_input)
225 #define EXT3_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
226 #define EXT3_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
227 #ifdef CONFIG_JBD_DEBUG
228 #define EXT3_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
229 #endif
230 #define EXT3_IOC_GETRSVSZ               _IOR('f', 5, long)
231 #define EXT3_IOC_SETRSVSZ               _IOW('f', 6, long)
232
233 /*
234  * ioctl commands in 32 bit emulation
235  */
236 #define EXT3_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
237 #define EXT3_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
238 #define EXT3_IOC32_GETVERSION           _IOR('f', 3, int)
239 #define EXT3_IOC32_SETVERSION           _IOW('f', 4, int)
240 #define EXT3_IOC32_GETRSVSZ             _IOR('f', 5, int)
241 #define EXT3_IOC32_SETRSVSZ             _IOW('f', 6, int)
242 #define EXT3_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
243 #ifdef CONFIG_JBD_DEBUG
244 #define EXT3_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
245 #endif
246 #define EXT3_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
247 #define EXT3_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
248
249
250 /*
251  *  Mount options
252  */
253 struct ext3_mount_options {
254         unsigned long s_mount_opt;
255         uid_t s_resuid;
256         gid_t s_resgid;
257         unsigned long s_commit_interval;
258 #ifdef CONFIG_QUOTA
259         int s_jquota_fmt;
260         char *s_qf_names[MAXQUOTAS];
261 #endif
262 };
263
264 /*
265  * Structure of an inode on the disk
266  */
267 struct ext3_inode {
268         __le16  i_mode;         /* File mode */
269         __le16  i_uid;          /* Low 16 bits of Owner Uid */
270         __le32  i_size;         /* Size in bytes */
271         __le32  i_atime;        /* Access time */
272         __le32  i_ctime;        /* Creation time */
273         __le32  i_mtime;        /* Modification time */
274         __le32  i_dtime;        /* Deletion Time */
275         __le16  i_gid;          /* Low 16 bits of Group Id */
276         __le16  i_links_count;  /* Links count */
277         __le32  i_blocks;       /* Blocks count */
278         __le32  i_flags;        /* File flags */
279         union {
280                 struct {
281                         __u32  l_i_reserved1;
282                 } linux1;
283                 struct {
284                         __u32  h_i_translator;
285                 } hurd1;
286                 struct {
287                         __u32  m_i_reserved1;
288                 } masix1;
289         } osd1;                         /* OS dependent 1 */
290         __le32  i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
291         __le32  i_generation;   /* File version (for NFS) */
292         __le32  i_file_acl;     /* File ACL */
293         __le32  i_dir_acl;      /* Directory ACL */
294         __le32  i_faddr;        /* Fragment address */
295         union {
296                 struct {
297                         __u8    l_i_frag;       /* Fragment number */
298                         __u8    l_i_fsize;      /* Fragment size */
299                         __u16   i_pad1;
300                         __le16  l_i_uid_high;   /* these 2 fields    */
301                         __le16  l_i_gid_high;   /* were reserved2[0] */
302                         __u32   l_i_reserved2;
303                 } linux2;
304                 struct {
305                         __u8    h_i_frag;       /* Fragment number */
306                         __u8    h_i_fsize;      /* Fragment size */
307                         __u16   h_i_mode_high;
308                         __u16   h_i_uid_high;
309                         __u16   h_i_gid_high;
310                         __u32   h_i_author;
311                 } hurd2;
312                 struct {
313                         __u8    m_i_frag;       /* Fragment number */
314                         __u8    m_i_fsize;      /* Fragment size */
315                         __u16   m_pad1;
316                         __u32   m_i_reserved2[2];
317                 } masix2;
318         } osd2;                         /* OS dependent 2 */
319         __le16  i_extra_isize;
320         __le16  i_pad1;
321 };
322
323 #define i_size_high     i_dir_acl
324
325 #if defined(__KERNEL__) || defined(__linux__)
326 #define i_reserved1     osd1.linux1.l_i_reserved1
327 #define i_frag          osd2.linux2.l_i_frag
328 #define i_fsize         osd2.linux2.l_i_fsize
329 #define i_uid_low       i_uid
330 #define i_gid_low       i_gid
331 #define i_uid_high      osd2.linux2.l_i_uid_high
332 #define i_gid_high      osd2.linux2.l_i_gid_high
333 #define i_reserved2     osd2.linux2.l_i_reserved2
334
335 #elif defined(__GNU__)
336
337 #define i_translator    osd1.hurd1.h_i_translator
338 #define i_frag          osd2.hurd2.h_i_frag;
339 #define i_fsize         osd2.hurd2.h_i_fsize;
340 #define i_uid_high      osd2.hurd2.h_i_uid_high
341 #define i_gid_high      osd2.hurd2.h_i_gid_high
342 #define i_author        osd2.hurd2.h_i_author
343
344 #elif defined(__masix__)
345
346 #define i_reserved1     osd1.masix1.m_i_reserved1
347 #define i_frag          osd2.masix2.m_i_frag
348 #define i_fsize         osd2.masix2.m_i_fsize
349 #define i_reserved2     osd2.masix2.m_i_reserved2
350
351 #endif /* defined(__KERNEL__) || defined(__linux__) */
352
353 /*
354  * File system states
355  */
356 #define EXT3_VALID_FS                   0x0001  /* Unmounted cleanly */
357 #define EXT3_ERROR_FS                   0x0002  /* Errors detected */
358 #define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */
359
360 /*
361  * Mount flags
362  */
363 #define EXT3_MOUNT_CHECK                0x00001 /* Do mount-time checks */
364 #define EXT3_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
365 #define EXT3_MOUNT_GRPID                0x00004 /* Create files with directory's group */
366 #define EXT3_MOUNT_DEBUG                0x00008 /* Some debugging messages */
367 #define EXT3_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
368 #define EXT3_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
369 #define EXT3_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
370 #define EXT3_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
371 #define EXT3_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
372 #define EXT3_MOUNT_ABORT                0x00200 /* Fatal error detected */
373 #define EXT3_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
374 #define EXT3_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
375 #define EXT3_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
376 #define EXT3_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
377 #define EXT3_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
378 #define EXT3_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
379 #define EXT3_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
380 #define EXT3_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
381 #define EXT3_MOUNT_RESERVATION          0x10000 /* Preallocation */
382 #define EXT3_MOUNT_BARRIER              0x20000 /* Use block barriers */
383 #define EXT3_MOUNT_NOBH                 0x40000 /* No bufferheads */
384 #define EXT3_MOUNT_QUOTA                0x80000 /* Some quota option set */
385 #define EXT3_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
386 #define EXT3_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
387
388 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
389 #ifndef _LINUX_EXT2_FS_H
390 #define clear_opt(o, opt)               o &= ~EXT3_MOUNT_##opt
391 #define set_opt(o, opt)                 o |= EXT3_MOUNT_##opt
392 #define test_opt(sb, opt)               (EXT3_SB(sb)->s_mount_opt & \
393                                          EXT3_MOUNT_##opt)
394 #else
395 #define EXT2_MOUNT_NOLOAD               EXT3_MOUNT_NOLOAD
396 #define EXT2_MOUNT_ABORT                EXT3_MOUNT_ABORT
397 #define EXT2_MOUNT_DATA_FLAGS           EXT3_MOUNT_DATA_FLAGS
398 #endif
399
400 #define ext3_set_bit                    ext2_set_bit
401 #define ext3_set_bit_atomic             ext2_set_bit_atomic
402 #define ext3_clear_bit                  ext2_clear_bit
403 #define ext3_clear_bit_atomic           ext2_clear_bit_atomic
404 #define ext3_test_bit                   ext2_test_bit
405 #define ext3_find_first_zero_bit        ext2_find_first_zero_bit
406 #define ext3_find_next_zero_bit         ext2_find_next_zero_bit
407
408 /*
409  * Maximal mount counts between two filesystem checks
410  */
411 #define EXT3_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
412 #define EXT3_DFL_CHECKINTERVAL          0       /* Don't use interval check */
413
414 /*
415  * Behaviour when detecting errors
416  */
417 #define EXT3_ERRORS_CONTINUE            1       /* Continue execution */
418 #define EXT3_ERRORS_RO                  2       /* Remount fs read-only */
419 #define EXT3_ERRORS_PANIC               3       /* Panic */
420 #define EXT3_ERRORS_DEFAULT             EXT3_ERRORS_CONTINUE
421
422 /*
423  * Structure of the super block
424  */
425 struct ext3_super_block {
426 /*00*/  __le32  s_inodes_count;         /* Inodes count */
427         __le32  s_blocks_count;         /* Blocks count */
428         __le32  s_r_blocks_count;       /* Reserved blocks count */
429         __le32  s_free_blocks_count;    /* Free blocks count */
430 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
431         __le32  s_first_data_block;     /* First Data Block */
432         __le32  s_log_block_size;       /* Block size */
433         __le32  s_log_frag_size;        /* Fragment size */
434 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
435         __le32  s_frags_per_group;      /* # Fragments per group */
436         __le32  s_inodes_per_group;     /* # Inodes per group */
437         __le32  s_mtime;                /* Mount time */
438 /*30*/  __le32  s_wtime;                /* Write time */
439         __le16  s_mnt_count;            /* Mount count */
440         __le16  s_max_mnt_count;        /* Maximal mount count */
441         __le16  s_magic;                /* Magic signature */
442         __le16  s_state;                /* File system state */
443         __le16  s_errors;               /* Behaviour when detecting errors */
444         __le16  s_minor_rev_level;      /* minor revision level */
445 /*40*/  __le32  s_lastcheck;            /* time of last check */
446         __le32  s_checkinterval;        /* max. time between checks */
447         __le32  s_creator_os;           /* OS */
448         __le32  s_rev_level;            /* Revision level */
449 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
450         __le16  s_def_resgid;           /* Default gid for reserved blocks */
451         /*
452          * These fields are for EXT3_DYNAMIC_REV superblocks only.
453          *
454          * Note: the difference between the compatible feature set and
455          * the incompatible feature set is that if there is a bit set
456          * in the incompatible feature set that the kernel doesn't
457          * know about, it should refuse to mount the filesystem.
458          *
459          * e2fsck's requirements are more strict; if it doesn't know
460          * about a feature in either the compatible or incompatible
461          * feature set, it must abort and not try to meddle with
462          * things it doesn't understand...
463          */
464         __le32  s_first_ino;            /* First non-reserved inode */
465         __le16   s_inode_size;          /* size of inode structure */
466         __le16  s_block_group_nr;       /* block group # of this superblock */
467         __le32  s_feature_compat;       /* compatible feature set */
468 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
469         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
470 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
471 /*78*/  char    s_volume_name[16];      /* volume name */
472 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
473 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
474         /*
475          * Performance hints.  Directory preallocation should only
476          * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
477          */
478         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
479         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
480         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
481         /*
482          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
483          */
484 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
485 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
486         __le32  s_journal_dev;          /* device number of journal file */
487         __le32  s_last_orphan;          /* start of list of inodes to delete */
488         __le32  s_hash_seed[4];         /* HTREE hash seed */
489         __u8    s_def_hash_version;     /* Default hash version to use */
490         __u8    s_reserved_char_pad;
491         __u16   s_reserved_word_pad;
492         __le32  s_default_mount_opts;
493         __le32  s_first_meta_bg;        /* First metablock block group */
494         __u32   s_reserved[190];        /* Padding to the end of the block */
495 };
496
497 #ifdef __KERNEL__
498 #include <linux/ext3_fs_i.h>
499 #include <linux/ext3_fs_sb.h>
500 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
501 {
502         return sb->s_fs_info;
503 }
504 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
505 {
506         return container_of(inode, struct ext3_inode_info, vfs_inode);
507 }
508
509 static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
510 {
511         return ino == EXT3_ROOT_INO ||
512                 ino == EXT3_JOURNAL_INO ||
513                 ino == EXT3_RESIZE_INO ||
514                 (ino >= EXT3_FIRST_INO(sb) &&
515                  ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
516 }
517 #else
518 /* Assume that user mode programs are passing in an ext3fs superblock, not
519  * a kernel struct super_block.  This will allow us to call the feature-test
520  * macros from user land. */
521 #define EXT3_SB(sb)     (sb)
522 #endif
523
524 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
525
526 /*
527  * Codes for operating systems
528  */
529 #define EXT3_OS_LINUX           0
530 #define EXT3_OS_HURD            1
531 #define EXT3_OS_MASIX           2
532 #define EXT3_OS_FREEBSD         3
533 #define EXT3_OS_LITES           4
534
535 /*
536  * Revision levels
537  */
538 #define EXT3_GOOD_OLD_REV       0       /* The good old (original) format */
539 #define EXT3_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
540
541 #define EXT3_CURRENT_REV        EXT3_GOOD_OLD_REV
542 #define EXT3_MAX_SUPP_REV       EXT3_DYNAMIC_REV
543
544 #define EXT3_GOOD_OLD_INODE_SIZE 128
545
546 /*
547  * Feature set definitions
548  */
549
550 #define EXT3_HAS_COMPAT_FEATURE(sb,mask)                        \
551         ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
552 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
553         ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
554 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask)                      \
555         ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
556 #define EXT3_SET_COMPAT_FEATURE(sb,mask)                        \
557         EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
558 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask)                     \
559         EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
560 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask)                      \
561         EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
562 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask)                      \
563         EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
564 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
565         EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
566 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
567         EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
568
569 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC        0x0001
570 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES       0x0002
571 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
572 #define EXT3_FEATURE_COMPAT_EXT_ATTR            0x0008
573 #define EXT3_FEATURE_COMPAT_RESIZE_INODE        0x0010
574 #define EXT3_FEATURE_COMPAT_DIR_INDEX           0x0020
575
576 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
577 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
578 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
579
580 #define EXT3_FEATURE_INCOMPAT_COMPRESSION       0x0001
581 #define EXT3_FEATURE_INCOMPAT_FILETYPE          0x0002
582 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
583 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
584 #define EXT3_FEATURE_INCOMPAT_META_BG           0x0010
585
586 #define EXT3_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
587 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT3_FEATURE_INCOMPAT_FILETYPE| \
588                                          EXT3_FEATURE_INCOMPAT_RECOVER| \
589                                          EXT3_FEATURE_INCOMPAT_META_BG)
590 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
591                                          EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
592                                          EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
593
594 /*
595  * Default values for user and/or group using reserved blocks
596  */
597 #define EXT3_DEF_RESUID         0
598 #define EXT3_DEF_RESGID         0
599
600 /*
601  * Default mount options
602  */
603 #define EXT3_DEFM_DEBUG         0x0001
604 #define EXT3_DEFM_BSDGROUPS     0x0002
605 #define EXT3_DEFM_XATTR_USER    0x0004
606 #define EXT3_DEFM_ACL           0x0008
607 #define EXT3_DEFM_UID16         0x0010
608 #define EXT3_DEFM_JMODE         0x0060
609 #define EXT3_DEFM_JMODE_DATA    0x0020
610 #define EXT3_DEFM_JMODE_ORDERED 0x0040
611 #define EXT3_DEFM_JMODE_WBACK   0x0060
612
613 /*
614  * Structure of a directory entry
615  */
616 #define EXT3_NAME_LEN 255
617
618 struct ext3_dir_entry {
619         __le32  inode;                  /* Inode number */
620         __le16  rec_len;                /* Directory entry length */
621         __le16  name_len;               /* Name length */
622         char    name[EXT3_NAME_LEN];    /* File name */
623 };
624
625 /*
626  * The new version of the directory entry.  Since EXT3 structures are
627  * stored in intel byte order, and the name_len field could never be
628  * bigger than 255 chars, it's safe to reclaim the extra byte for the
629  * file_type field.
630  */
631 struct ext3_dir_entry_2 {
632         __le32  inode;                  /* Inode number */
633         __le16  rec_len;                /* Directory entry length */
634         __u8    name_len;               /* Name length */
635         __u8    file_type;
636         char    name[EXT3_NAME_LEN];    /* File name */
637 };
638
639 /*
640  * Ext3 directory file types.  Only the low 3 bits are used.  The
641  * other bits are reserved for now.
642  */
643 #define EXT3_FT_UNKNOWN         0
644 #define EXT3_FT_REG_FILE        1
645 #define EXT3_FT_DIR             2
646 #define EXT3_FT_CHRDEV          3
647 #define EXT3_FT_BLKDEV          4
648 #define EXT3_FT_FIFO            5
649 #define EXT3_FT_SOCK            6
650 #define EXT3_FT_SYMLINK         7
651
652 #define EXT3_FT_MAX             8
653
654 /*
655  * EXT3_DIR_PAD defines the directory entries boundaries
656  *
657  * NOTE: It must be a multiple of 4
658  */
659 #define EXT3_DIR_PAD                    4
660 #define EXT3_DIR_ROUND                  (EXT3_DIR_PAD - 1)
661 #define EXT3_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT3_DIR_ROUND) & \
662                                          ~EXT3_DIR_ROUND)
663 /*
664  * Hash Tree Directory indexing
665  * (c) Daniel Phillips, 2001
666  */
667
668 #ifdef CONFIG_EXT3_INDEX
669   #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
670                                               EXT3_FEATURE_COMPAT_DIR_INDEX) && \
671                       (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
672 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
673 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
674 #else
675   #define is_dx(dir) 0
676 #define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
677 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
678 #endif
679
680 /* Legal values for the dx_root hash_version field: */
681
682 #define DX_HASH_LEGACY          0
683 #define DX_HASH_HALF_MD4        1
684 #define DX_HASH_TEA             2
685
686 #ifdef __KERNEL__
687
688 /* hash info structure used by the directory hash */
689 struct dx_hash_info
690 {
691         u32             hash;
692         u32             minor_hash;
693         int             hash_version;
694         u32             *seed;
695 };
696
697 #define EXT3_HTREE_EOF  0x7fffffff
698
699 /*
700  * Control parameters used by ext3_htree_next_block
701  */
702 #define HASH_NB_ALWAYS          1
703
704
705 /*
706  * Describe an inode's exact location on disk and in memory
707  */
708 struct ext3_iloc
709 {
710         struct buffer_head *bh;
711         unsigned long offset;
712         unsigned long block_group;
713 };
714
715 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
716 {
717         return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
718 }
719
720 /*
721  * This structure is stuffed into the struct file's private_data field
722  * for directories.  It is where we put information so that we can do
723  * readdir operations in hash tree order.
724  */
725 struct dir_private_info {
726         struct rb_root  root;
727         struct rb_node  *curr_node;
728         struct fname    *extra_fname;
729         loff_t          last_pos;
730         __u32           curr_hash;
731         __u32           curr_minor_hash;
732         __u32           next_hash;
733 };
734
735 /* calculate the first block number of the group */
736 static inline ext3_fsblk_t
737 ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
738 {
739         return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
740                 le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
741 }
742
743 /*
744  * Special error return code only used by dx_probe() and its callers.
745  */
746 #define ERR_BAD_DX_DIR  -75000
747
748 /*
749  * Function prototypes
750  */
751
752 /*
753  * Ok, these declarations are also in <linux/kernel.h> but none of the
754  * ext3 source programs needs to include it so they are duplicated here.
755  */
756 # define NORET_TYPE    /**/
757 # define ATTRIB_NORET  __attribute__((noreturn))
758 # define NORET_AND     noreturn,
759
760 /* balloc.c */
761 extern int ext3_bg_has_super(struct super_block *sb, int group);
762 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
763 extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
764                         ext3_fsblk_t goal, int *errp);
765 extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
766                         ext3_fsblk_t goal, unsigned long *count, int *errp);
767 extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
768                         ext3_fsblk_t block, unsigned long count);
769 extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
770                                  ext3_fsblk_t block, unsigned long count,
771                                 unsigned long *pdquot_freed_blocks);
772 extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
773 extern void ext3_check_blocks_bitmap (struct super_block *);
774 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
775                                                     unsigned int block_group,
776                                                     struct buffer_head ** bh);
777 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
778 extern void ext3_init_block_alloc_info(struct inode *);
779 extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
780
781 /* dir.c */
782 extern int ext3_check_dir_entry(const char *, struct inode *,
783                                 struct ext3_dir_entry_2 *,
784                                 struct buffer_head *, unsigned long);
785 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
786                                     __u32 minor_hash,
787                                     struct ext3_dir_entry_2 *dirent);
788 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
789
790 /* fsync.c */
791 extern int ext3_sync_file (struct file *, struct dentry *, int);
792
793 /* hash.c */
794 extern int ext3fs_dirhash(const char *name, int len, struct
795                           dx_hash_info *hinfo);
796
797 /* ialloc.c */
798 extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
799 extern void ext3_free_inode (handle_t *, struct inode *);
800 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
801 extern unsigned long ext3_count_free_inodes (struct super_block *);
802 extern unsigned long ext3_count_dirs (struct super_block *);
803 extern void ext3_check_inodes_bitmap (struct super_block *);
804 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
805
806
807 /* inode.c */
808 int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
809                 struct buffer_head *bh, ext3_fsblk_t blocknr);
810 struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
811 struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
812 int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
813         sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
814         int create, int extend_disksize);
815
816 extern void ext3_read_inode (struct inode *);
817 extern int  ext3_write_inode (struct inode *, int);
818 extern int  ext3_setattr (struct dentry *, struct iattr *);
819 extern void ext3_delete_inode (struct inode *);
820 extern int  ext3_sync_inode (handle_t *, struct inode *);
821 extern void ext3_discard_reservation (struct inode *);
822 extern void ext3_dirty_inode(struct inode *);
823 extern int ext3_change_inode_journal_flag(struct inode *, int);
824 extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
825 extern void ext3_truncate (struct inode *);
826 extern void ext3_set_inode_flags(struct inode *);
827 extern void ext3_get_inode_flags(struct ext3_inode_info *);
828 extern void ext3_set_aops(struct inode *inode);
829
830 /* ioctl.c */
831 extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
832                        unsigned long);
833 extern long ext3_compat_ioctl (struct file *, unsigned int, unsigned long);
834
835 /* namei.c */
836 extern int ext3_orphan_add(handle_t *, struct inode *);
837 extern int ext3_orphan_del(handle_t *, struct inode *);
838 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
839                                 __u32 start_minor_hash, __u32 *next_hash);
840
841 /* resize.c */
842 extern int ext3_group_add(struct super_block *sb,
843                                 struct ext3_new_group_data *input);
844 extern int ext3_group_extend(struct super_block *sb,
845                                 struct ext3_super_block *es,
846                                 ext3_fsblk_t n_blocks_count);
847
848 /* super.c */
849 extern void ext3_error (struct super_block *, const char *, const char *, ...)
850         __attribute__ ((format (printf, 3, 4)));
851 extern void __ext3_std_error (struct super_block *, const char *, int);
852 extern void ext3_abort (struct super_block *, const char *, const char *, ...)
853         __attribute__ ((format (printf, 3, 4)));
854 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
855         __attribute__ ((format (printf, 3, 4)));
856 extern void ext3_update_dynamic_rev (struct super_block *sb);
857
858 #define ext3_std_error(sb, errno)                               \
859 do {                                                            \
860         if ((errno))                                            \
861                 __ext3_std_error((sb), __FUNCTION__, (errno));  \
862 } while (0)
863
864 /*
865  * Inodes and files operations
866  */
867
868 /* dir.c */
869 extern const struct file_operations ext3_dir_operations;
870
871 /* file.c */
872 extern const struct inode_operations ext3_file_inode_operations;
873 extern const struct file_operations ext3_file_operations;
874
875 /* namei.c */
876 extern const struct inode_operations ext3_dir_inode_operations;
877 extern const struct inode_operations ext3_special_inode_operations;
878
879 /* symlink.c */
880 extern const struct inode_operations ext3_symlink_inode_operations;
881 extern const struct inode_operations ext3_fast_symlink_inode_operations;
882
883
884 #endif  /* __KERNEL__ */
885
886 #endif  /* _LINUX_EXT3_FS_H */