scheduler: compute time-average nr_running per run-queue
[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 /*
40  * Debug code
41  */
42 #ifdef EXT3FS_DEBUG
43 #define ext3_debug(f, a...)                                             \
44         do {                                                            \
45                 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:",       \
46                         __FILE__, __LINE__, __func__);          \
47                 printk (KERN_DEBUG f, ## a);                            \
48         } while (0)
49 #else
50 #define ext3_debug(f, a...)     do {} while (0)
51 #endif
52
53 /*
54  * Special inodes numbers
55  */
56 #define EXT3_BAD_INO             1      /* Bad blocks inode */
57 #define EXT3_ROOT_INO            2      /* Root inode */
58 #define EXT3_BOOT_LOADER_INO     5      /* Boot loader inode */
59 #define EXT3_UNDEL_DIR_INO       6      /* Undelete directory inode */
60 #define EXT3_RESIZE_INO          7      /* Reserved group descriptors inode */
61 #define EXT3_JOURNAL_INO         8      /* Journal inode */
62
63 /* First non-reserved inode for old ext3 filesystems */
64 #define EXT3_GOOD_OLD_FIRST_INO 11
65
66 /*
67  * Maximal count of links to a file
68  */
69 #define EXT3_LINK_MAX           32000
70
71 /*
72  * Macro-instructions used to manage several block sizes
73  */
74 #define EXT3_MIN_BLOCK_SIZE             1024
75 #define EXT3_MAX_BLOCK_SIZE             65536
76 #define EXT3_MIN_BLOCK_LOG_SIZE         10
77 #ifdef __KERNEL__
78 # define EXT3_BLOCK_SIZE(s)             ((s)->s_blocksize)
79 #else
80 # define EXT3_BLOCK_SIZE(s)             (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
81 #endif
82 #define EXT3_ADDR_PER_BLOCK(s)          (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
83 #ifdef __KERNEL__
84 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
85 #else
86 # define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
87 #endif
88 #ifdef __KERNEL__
89 #define EXT3_ADDR_PER_BLOCK_BITS(s)     (EXT3_SB(s)->s_addr_per_block_bits)
90 #define EXT3_INODE_SIZE(s)              (EXT3_SB(s)->s_inode_size)
91 #define EXT3_FIRST_INO(s)               (EXT3_SB(s)->s_first_ino)
92 #else
93 #define EXT3_INODE_SIZE(s)      (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
94                                  EXT3_GOOD_OLD_INODE_SIZE : \
95                                  (s)->s_inode_size)
96 #define EXT3_FIRST_INO(s)       (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
97                                  EXT3_GOOD_OLD_FIRST_INO : \
98                                  (s)->s_first_ino)
99 #endif
100
101 /*
102  * Macro-instructions used to manage fragments
103  */
104 #define EXT3_MIN_FRAG_SIZE              1024
105 #define EXT3_MAX_FRAG_SIZE              4096
106 #define EXT3_MIN_FRAG_LOG_SIZE            10
107 #ifdef __KERNEL__
108 # define EXT3_FRAG_SIZE(s)              (EXT3_SB(s)->s_frag_size)
109 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_SB(s)->s_frags_per_block)
110 #else
111 # define EXT3_FRAG_SIZE(s)              (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
112 # define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
113 #endif
114
115 /*
116  * Structure of a blocks group descriptor
117  */
118 struct ext3_group_desc
119 {
120         __le32  bg_block_bitmap;                /* Blocks bitmap block */
121         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
122         __le32  bg_inode_table;         /* Inodes table block */
123         __le16  bg_free_blocks_count;   /* Free blocks count */
124         __le16  bg_free_inodes_count;   /* Free inodes count */
125         __le16  bg_used_dirs_count;     /* Directories count */
126         __u16   bg_pad;
127         __le32  bg_reserved[3];
128 };
129
130 /*
131  * Macro-instructions used to manage group descriptors
132  */
133 #ifdef __KERNEL__
134 # define EXT3_BLOCKS_PER_GROUP(s)       (EXT3_SB(s)->s_blocks_per_group)
135 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_SB(s)->s_desc_per_block)
136 # define EXT3_INODES_PER_GROUP(s)       (EXT3_SB(s)->s_inodes_per_group)
137 # define EXT3_DESC_PER_BLOCK_BITS(s)    (EXT3_SB(s)->s_desc_per_block_bits)
138 #else
139 # define EXT3_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
140 # define EXT3_DESC_PER_BLOCK(s)         (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
141 # define EXT3_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
142 #endif
143
144 /*
145  * Constants relative to the data blocks
146  */
147 #define EXT3_NDIR_BLOCKS                12
148 #define EXT3_IND_BLOCK                  EXT3_NDIR_BLOCKS
149 #define EXT3_DIND_BLOCK                 (EXT3_IND_BLOCK + 1)
150 #define EXT3_TIND_BLOCK                 (EXT3_DIND_BLOCK + 1)
151 #define EXT3_N_BLOCKS                   (EXT3_TIND_BLOCK + 1)
152
153 /*
154  * Inode flags
155  */
156 #define EXT3_SECRM_FL                   0x00000001 /* Secure deletion */
157 #define EXT3_UNRM_FL                    0x00000002 /* Undelete */
158 #define EXT3_COMPR_FL                   0x00000004 /* Compress file */
159 #define EXT3_SYNC_FL                    0x00000008 /* Synchronous updates */
160 #define EXT3_IMMUTABLE_FL               0x00000010 /* Immutable file */
161 #define EXT3_APPEND_FL                  0x00000020 /* writes to file may only append */
162 #define EXT3_NODUMP_FL                  0x00000040 /* do not dump file */
163 #define EXT3_NOATIME_FL                 0x00000080 /* do not update atime */
164 /* Reserved for compression usage... */
165 #define EXT3_DIRTY_FL                   0x00000100
166 #define EXT3_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
167 #define EXT3_NOCOMPR_FL                 0x00000400 /* Don't compress */
168 #define EXT3_ECOMPR_FL                  0x00000800 /* Compression error */
169 /* End compression flags --- maybe not all used */
170 #define EXT3_INDEX_FL                   0x00001000 /* hash-indexed directory */
171 #define EXT3_IMAGIC_FL                  0x00002000 /* AFS directory */
172 #define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
173 #define EXT3_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
174 #define EXT3_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
175 #define EXT3_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
176 #define EXT3_RESERVED_FL                0x80000000 /* reserved for ext3 lib */
177
178 #define EXT3_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
179 #define EXT3_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */
180
181 /* Flags that should be inherited by new inodes from their parent. */
182 #define EXT3_FL_INHERITED (EXT3_SECRM_FL | EXT3_UNRM_FL | EXT3_COMPR_FL |\
183                            EXT3_SYNC_FL | EXT3_NODUMP_FL |\
184                            EXT3_NOATIME_FL | EXT3_COMPRBLK_FL |\
185                            EXT3_NOCOMPR_FL | EXT3_JOURNAL_DATA_FL |\
186                            EXT3_NOTAIL_FL | EXT3_DIRSYNC_FL)
187
188 /* Flags that are appropriate for regular files (all but dir-specific ones). */
189 #define EXT3_REG_FLMASK (~(EXT3_DIRSYNC_FL | EXT3_TOPDIR_FL))
190
191 /* Flags that are appropriate for non-directories/regular files. */
192 #define EXT3_OTHER_FLMASK (EXT3_NODUMP_FL | EXT3_NOATIME_FL)
193
194 /* Mask out flags that are inappropriate for the given type of inode. */
195 static inline __u32 ext3_mask_flags(umode_t mode, __u32 flags)
196 {
197         if (S_ISDIR(mode))
198                 return flags;
199         else if (S_ISREG(mode))
200                 return flags & EXT3_REG_FLMASK;
201         else
202                 return flags & EXT3_OTHER_FLMASK;
203 }
204
205 /* Used to pass group descriptor data when online resize is done */
206 struct ext3_new_group_input {
207         __u32 group;            /* Group number for this data */
208         __u32 block_bitmap;     /* Absolute block number of block bitmap */
209         __u32 inode_bitmap;     /* Absolute block number of inode bitmap */
210         __u32 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 ext3_new_group_input in kernel space, with free_blocks_count */
217 struct ext3_new_group_data {
218         __u32 group;
219         __u32 block_bitmap;
220         __u32 inode_bitmap;
221         __u32 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 EXT3_IOC_GETFLAGS               FS_IOC_GETFLAGS
233 #define EXT3_IOC_SETFLAGS               FS_IOC_SETFLAGS
234 #define EXT3_IOC_GETVERSION             _IOR('f', 3, long)
235 #define EXT3_IOC_SETVERSION             _IOW('f', 4, long)
236 #define EXT3_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
237 #define EXT3_IOC_GROUP_ADD              _IOW('f', 8,struct ext3_new_group_input)
238 #define EXT3_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
239 #define EXT3_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
240 #ifdef CONFIG_JBD_DEBUG
241 #define EXT3_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)
242 #endif
243 #define EXT3_IOC_GETRSVSZ               _IOR('f', 5, long)
244 #define EXT3_IOC_SETRSVSZ               _IOW('f', 6, long)
245
246 /*
247  * ioctl commands in 32 bit emulation
248  */
249 #define EXT3_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
250 #define EXT3_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
251 #define EXT3_IOC32_GETVERSION           _IOR('f', 3, int)
252 #define EXT3_IOC32_SETVERSION           _IOW('f', 4, int)
253 #define EXT3_IOC32_GETRSVSZ             _IOR('f', 5, int)
254 #define EXT3_IOC32_SETRSVSZ             _IOW('f', 6, int)
255 #define EXT3_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
256 #ifdef CONFIG_JBD_DEBUG
257 #define EXT3_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)
258 #endif
259 #define EXT3_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
260 #define EXT3_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
261
262
263 /*
264  *  Mount options
265  */
266 struct ext3_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 ext3_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[EXT3_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                         __u16   i_pad1;
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                         __u16   m_pad1;
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_uid_low       i_uid
343 #define i_gid_low       i_gid
344 #define i_uid_high      osd2.linux2.l_i_uid_high
345 #define i_gid_high      osd2.linux2.l_i_gid_high
346 #define i_reserved2     osd2.linux2.l_i_reserved2
347
348 #elif defined(__GNU__)
349
350 #define i_translator    osd1.hurd1.h_i_translator
351 #define i_frag          osd2.hurd2.h_i_frag;
352 #define i_fsize         osd2.hurd2.h_i_fsize;
353 #define i_uid_high      osd2.hurd2.h_i_uid_high
354 #define i_gid_high      osd2.hurd2.h_i_gid_high
355 #define i_author        osd2.hurd2.h_i_author
356
357 #elif defined(__masix__)
358
359 #define i_reserved1     osd1.masix1.m_i_reserved1
360 #define i_frag          osd2.masix2.m_i_frag
361 #define i_fsize         osd2.masix2.m_i_fsize
362 #define i_reserved2     osd2.masix2.m_i_reserved2
363
364 #endif /* defined(__KERNEL__) || defined(__linux__) */
365
366 /*
367  * File system states
368  */
369 #define EXT3_VALID_FS                   0x0001  /* Unmounted cleanly */
370 #define EXT3_ERROR_FS                   0x0002  /* Errors detected */
371 #define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */
372
373 /*
374  * Misc. filesystem flags
375  */
376 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
377 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
378 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
379
380 /*
381  * Mount flags
382  */
383 #define EXT3_MOUNT_CHECK                0x00001 /* Do mount-time checks */
384 #define EXT3_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */
385 #define EXT3_MOUNT_GRPID                0x00004 /* Create files with directory's group */
386 #define EXT3_MOUNT_DEBUG                0x00008 /* Some debugging messages */
387 #define EXT3_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
388 #define EXT3_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
389 #define EXT3_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
390 #define EXT3_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
391 #define EXT3_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
392 #define EXT3_MOUNT_ABORT                0x00200 /* Fatal error detected */
393 #define EXT3_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
394 #define EXT3_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
395 #define EXT3_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
396 #define EXT3_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
397 #define EXT3_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
398 #define EXT3_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
399 #define EXT3_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
400 #define EXT3_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
401 #define EXT3_MOUNT_RESERVATION          0x10000 /* Preallocation */
402 #define EXT3_MOUNT_BARRIER              0x20000 /* Use block barriers */
403 #define EXT3_MOUNT_QUOTA                0x80000 /* Some quota option set */
404 #define EXT3_MOUNT_USRQUOTA             0x100000 /* "old" user quota */
405 #define EXT3_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */
406 #define EXT3_MOUNT_DATA_ERR_ABORT       0x400000 /* Abort on file data write
407                                                   * error in ordered mode */
408
409 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
410 #ifndef _LINUX_EXT2_FS_H
411 #define clear_opt(o, opt)               o &= ~EXT3_MOUNT_##opt
412 #define set_opt(o, opt)                 o |= EXT3_MOUNT_##opt
413 #define test_opt(sb, opt)               (EXT3_SB(sb)->s_mount_opt & \
414                                          EXT3_MOUNT_##opt)
415 #else
416 #define EXT2_MOUNT_NOLOAD               EXT3_MOUNT_NOLOAD
417 #define EXT2_MOUNT_ABORT                EXT3_MOUNT_ABORT
418 #define EXT2_MOUNT_DATA_FLAGS           EXT3_MOUNT_DATA_FLAGS
419 #endif
420
421 #define ext3_set_bit                    __set_bit_le
422 #define ext3_set_bit_atomic             ext2_set_bit_atomic
423 #define ext3_clear_bit                  __clear_bit_le
424 #define ext3_clear_bit_atomic           ext2_clear_bit_atomic
425 #define ext3_test_bit                   test_bit_le
426 #define ext3_find_next_zero_bit         find_next_zero_bit_le
427
428 /*
429  * Maximal mount counts between two filesystem checks
430  */
431 #define EXT3_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
432 #define EXT3_DFL_CHECKINTERVAL          0       /* Don't use interval check */
433
434 /*
435  * Behaviour when detecting errors
436  */
437 #define EXT3_ERRORS_CONTINUE            1       /* Continue execution */
438 #define EXT3_ERRORS_RO                  2       /* Remount fs read-only */
439 #define EXT3_ERRORS_PANIC               3       /* Panic */
440 #define EXT3_ERRORS_DEFAULT             EXT3_ERRORS_CONTINUE
441
442 /*
443  * Structure of the super block
444  */
445 struct ext3_super_block {
446 /*00*/  __le32  s_inodes_count;         /* Inodes count */
447         __le32  s_blocks_count;         /* Blocks count */
448         __le32  s_r_blocks_count;       /* Reserved blocks count */
449         __le32  s_free_blocks_count;    /* Free blocks count */
450 /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
451         __le32  s_first_data_block;     /* First Data Block */
452         __le32  s_log_block_size;       /* Block size */
453         __le32  s_log_frag_size;        /* Fragment size */
454 /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
455         __le32  s_frags_per_group;      /* # Fragments per group */
456         __le32  s_inodes_per_group;     /* # Inodes per group */
457         __le32  s_mtime;                /* Mount time */
458 /*30*/  __le32  s_wtime;                /* Write time */
459         __le16  s_mnt_count;            /* Mount count */
460         __le16  s_max_mnt_count;        /* Maximal mount count */
461         __le16  s_magic;                /* Magic signature */
462         __le16  s_state;                /* File system state */
463         __le16  s_errors;               /* Behaviour when detecting errors */
464         __le16  s_minor_rev_level;      /* minor revision level */
465 /*40*/  __le32  s_lastcheck;            /* time of last check */
466         __le32  s_checkinterval;        /* max. time between checks */
467         __le32  s_creator_os;           /* OS */
468         __le32  s_rev_level;            /* Revision level */
469 /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
470         __le16  s_def_resgid;           /* Default gid for reserved blocks */
471         /*
472          * These fields are for EXT3_DYNAMIC_REV superblocks only.
473          *
474          * Note: the difference between the compatible feature set and
475          * the incompatible feature set is that if there is a bit set
476          * in the incompatible feature set that the kernel doesn't
477          * know about, it should refuse to mount the filesystem.
478          *
479          * e2fsck's requirements are more strict; if it doesn't know
480          * about a feature in either the compatible or incompatible
481          * feature set, it must abort and not try to meddle with
482          * things it doesn't understand...
483          */
484         __le32  s_first_ino;            /* First non-reserved inode */
485         __le16   s_inode_size;          /* size of inode structure */
486         __le16  s_block_group_nr;       /* block group # of this superblock */
487         __le32  s_feature_compat;       /* compatible feature set */
488 /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
489         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
490 /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
491 /*78*/  char    s_volume_name[16];      /* volume name */
492 /*88*/  char    s_last_mounted[64];     /* directory where last mounted */
493 /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
494         /*
495          * Performance hints.  Directory preallocation should only
496          * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
497          */
498         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
499         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
500         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
501         /*
502          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
503          */
504 /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
505 /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
506         __le32  s_journal_dev;          /* device number of journal file */
507         __le32  s_last_orphan;          /* start of list of inodes to delete */
508         __le32  s_hash_seed[4];         /* HTREE hash seed */
509         __u8    s_def_hash_version;     /* Default hash version to use */
510         __u8    s_reserved_char_pad;
511         __u16   s_reserved_word_pad;
512         __le32  s_default_mount_opts;
513         __le32  s_first_meta_bg;        /* First metablock block group */
514         __le32  s_mkfs_time;            /* When the filesystem was created */
515         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
516         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
517 /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
518         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
519         __le32  s_free_blocks_count_hi; /* Free blocks count */
520         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
521         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
522         __le32  s_flags;                /* Miscellaneous flags */
523         __le16  s_raid_stride;          /* RAID stride */
524         __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */
525         __le64  s_mmp_block;            /* Block for multi-mount protection */
526         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
527         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
528         __u8    s_reserved_char_pad2;
529         __le16  s_reserved_pad;
530         __u32   s_reserved[162];        /* Padding to the end of the block */
531 };
532
533 #ifdef __KERNEL__
534 #include <linux/ext3_fs_i.h>
535 #include <linux/ext3_fs_sb.h>
536 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
537 {
538         return sb->s_fs_info;
539 }
540 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
541 {
542         return container_of(inode, struct ext3_inode_info, vfs_inode);
543 }
544
545 static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
546 {
547         return ino == EXT3_ROOT_INO ||
548                 ino == EXT3_JOURNAL_INO ||
549                 ino == EXT3_RESIZE_INO ||
550                 (ino >= EXT3_FIRST_INO(sb) &&
551                  ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
552 }
553
554 /*
555  * Inode dynamic state flags
556  */
557 enum {
558         EXT3_STATE_JDATA,               /* journaled data exists */
559         EXT3_STATE_NEW,                 /* inode is newly created */
560         EXT3_STATE_XATTR,               /* has in-inode xattrs */
561         EXT3_STATE_FLUSH_ON_CLOSE,      /* flush dirty pages on close */
562 };
563
564 static inline int ext3_test_inode_state(struct inode *inode, int bit)
565 {
566         return test_bit(bit, &EXT3_I(inode)->i_state_flags);
567 }
568
569 static inline void ext3_set_inode_state(struct inode *inode, int bit)
570 {
571         set_bit(bit, &EXT3_I(inode)->i_state_flags);
572 }
573
574 static inline void ext3_clear_inode_state(struct inode *inode, int bit)
575 {
576         clear_bit(bit, &EXT3_I(inode)->i_state_flags);
577 }
578 #else
579 /* Assume that user mode programs are passing in an ext3fs superblock, not
580  * a kernel struct super_block.  This will allow us to call the feature-test
581  * macros from user land. */
582 #define EXT3_SB(sb)     (sb)
583 #endif
584
585 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
586
587 /*
588  * Codes for operating systems
589  */
590 #define EXT3_OS_LINUX           0
591 #define EXT3_OS_HURD            1
592 #define EXT3_OS_MASIX           2
593 #define EXT3_OS_FREEBSD         3
594 #define EXT3_OS_LITES           4
595
596 /*
597  * Revision levels
598  */
599 #define EXT3_GOOD_OLD_REV       0       /* The good old (original) format */
600 #define EXT3_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
601
602 #define EXT3_CURRENT_REV        EXT3_GOOD_OLD_REV
603 #define EXT3_MAX_SUPP_REV       EXT3_DYNAMIC_REV
604
605 #define EXT3_GOOD_OLD_INODE_SIZE 128
606
607 /*
608  * Feature set definitions
609  */
610
611 #define EXT3_HAS_COMPAT_FEATURE(sb,mask)                        \
612         ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
613 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
614         ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
615 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask)                      \
616         ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
617 #define EXT3_SET_COMPAT_FEATURE(sb,mask)                        \
618         EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
619 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask)                     \
620         EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
621 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask)                      \
622         EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
623 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask)                      \
624         EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
625 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
626         EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
627 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
628         EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
629
630 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC        0x0001
631 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES       0x0002
632 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
633 #define EXT3_FEATURE_COMPAT_EXT_ATTR            0x0008
634 #define EXT3_FEATURE_COMPAT_RESIZE_INODE        0x0010
635 #define EXT3_FEATURE_COMPAT_DIR_INDEX           0x0020
636
637 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
638 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
639 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
640
641 #define EXT3_FEATURE_INCOMPAT_COMPRESSION       0x0001
642 #define EXT3_FEATURE_INCOMPAT_FILETYPE          0x0002
643 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
644 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
645 #define EXT3_FEATURE_INCOMPAT_META_BG           0x0010
646
647 #define EXT3_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
648 #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT3_FEATURE_INCOMPAT_FILETYPE| \
649                                          EXT3_FEATURE_INCOMPAT_RECOVER| \
650                                          EXT3_FEATURE_INCOMPAT_META_BG)
651 #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
652                                          EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
653                                          EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
654
655 /*
656  * Default values for user and/or group using reserved blocks
657  */
658 #define EXT3_DEF_RESUID         0
659 #define EXT3_DEF_RESGID         0
660
661 /*
662  * Default mount options
663  */
664 #define EXT3_DEFM_DEBUG         0x0001
665 #define EXT3_DEFM_BSDGROUPS     0x0002
666 #define EXT3_DEFM_XATTR_USER    0x0004
667 #define EXT3_DEFM_ACL           0x0008
668 #define EXT3_DEFM_UID16         0x0010
669 #define EXT3_DEFM_JMODE         0x0060
670 #define EXT3_DEFM_JMODE_DATA    0x0020
671 #define EXT3_DEFM_JMODE_ORDERED 0x0040
672 #define EXT3_DEFM_JMODE_WBACK   0x0060
673
674 /*
675  * Structure of a directory entry
676  */
677 #define EXT3_NAME_LEN 255
678
679 struct ext3_dir_entry {
680         __le32  inode;                  /* Inode number */
681         __le16  rec_len;                /* Directory entry length */
682         __le16  name_len;               /* Name length */
683         char    name[EXT3_NAME_LEN];    /* File name */
684 };
685
686 /*
687  * The new version of the directory entry.  Since EXT3 structures are
688  * stored in intel byte order, and the name_len field could never be
689  * bigger than 255 chars, it's safe to reclaim the extra byte for the
690  * file_type field.
691  */
692 struct ext3_dir_entry_2 {
693         __le32  inode;                  /* Inode number */
694         __le16  rec_len;                /* Directory entry length */
695         __u8    name_len;               /* Name length */
696         __u8    file_type;
697         char    name[EXT3_NAME_LEN];    /* File name */
698 };
699
700 /*
701  * Ext3 directory file types.  Only the low 3 bits are used.  The
702  * other bits are reserved for now.
703  */
704 #define EXT3_FT_UNKNOWN         0
705 #define EXT3_FT_REG_FILE        1
706 #define EXT3_FT_DIR             2
707 #define EXT3_FT_CHRDEV          3
708 #define EXT3_FT_BLKDEV          4
709 #define EXT3_FT_FIFO            5
710 #define EXT3_FT_SOCK            6
711 #define EXT3_FT_SYMLINK         7
712
713 #define EXT3_FT_MAX             8
714
715 /*
716  * EXT3_DIR_PAD defines the directory entries boundaries
717  *
718  * NOTE: It must be a multiple of 4
719  */
720 #define EXT3_DIR_PAD                    4
721 #define EXT3_DIR_ROUND                  (EXT3_DIR_PAD - 1)
722 #define EXT3_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT3_DIR_ROUND) & \
723                                          ~EXT3_DIR_ROUND)
724 #define EXT3_MAX_REC_LEN                ((1<<16)-1)
725
726 /*
727  * Tests against MAX_REC_LEN etc were put in place for 64k block
728  * sizes; if that is not possible on this arch, we can skip
729  * those tests and speed things up.
730  */
731 static inline unsigned ext3_rec_len_from_disk(__le16 dlen)
732 {
733         unsigned len = le16_to_cpu(dlen);
734
735 #if (PAGE_CACHE_SIZE >= 65536)
736         if (len == EXT3_MAX_REC_LEN)
737                 return 1 << 16;
738 #endif
739         return len;
740 }
741
742 static inline __le16 ext3_rec_len_to_disk(unsigned len)
743 {
744 #if (PAGE_CACHE_SIZE >= 65536)
745         if (len == (1 << 16))
746                 return cpu_to_le16(EXT3_MAX_REC_LEN);
747         else if (len > (1 << 16))
748                 BUG();
749 #endif
750         return cpu_to_le16(len);
751 }
752
753 /*
754  * Hash Tree Directory indexing
755  * (c) Daniel Phillips, 2001
756  */
757
758 #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
759                                       EXT3_FEATURE_COMPAT_DIR_INDEX) && \
760                       (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
761 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
762 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
763
764 /* Legal values for the dx_root hash_version field: */
765
766 #define DX_HASH_LEGACY          0
767 #define DX_HASH_HALF_MD4        1
768 #define DX_HASH_TEA             2
769 #define DX_HASH_LEGACY_UNSIGNED 3
770 #define DX_HASH_HALF_MD4_UNSIGNED       4
771 #define DX_HASH_TEA_UNSIGNED            5
772
773 #ifdef __KERNEL__
774
775 /* hash info structure used by the directory hash */
776 struct dx_hash_info
777 {
778         u32             hash;
779         u32             minor_hash;
780         int             hash_version;
781         u32             *seed;
782 };
783
784 #define EXT3_HTREE_EOF  0x7fffffff
785
786 /*
787  * Control parameters used by ext3_htree_next_block
788  */
789 #define HASH_NB_ALWAYS          1
790
791
792 /*
793  * Describe an inode's exact location on disk and in memory
794  */
795 struct ext3_iloc
796 {
797         struct buffer_head *bh;
798         unsigned long offset;
799         unsigned long block_group;
800 };
801
802 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
803 {
804         return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
805 }
806
807 /*
808  * This structure is stuffed into the struct file's private_data field
809  * for directories.  It is where we put information so that we can do
810  * readdir operations in hash tree order.
811  */
812 struct dir_private_info {
813         struct rb_root  root;
814         struct rb_node  *curr_node;
815         struct fname    *extra_fname;
816         loff_t          last_pos;
817         __u32           curr_hash;
818         __u32           curr_minor_hash;
819         __u32           next_hash;
820 };
821
822 /* calculate the first block number of the group */
823 static inline ext3_fsblk_t
824 ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
825 {
826         return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
827                 le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
828 }
829
830 /*
831  * Special error return code only used by dx_probe() and its callers.
832  */
833 #define ERR_BAD_DX_DIR  -75000
834
835 /*
836  * Function prototypes
837  */
838
839 /*
840  * Ok, these declarations are also in <linux/kernel.h> but none of the
841  * ext3 source programs needs to include it so they are duplicated here.
842  */
843 # define NORET_TYPE    /**/
844 # define ATTRIB_NORET  __attribute__((noreturn))
845 # define NORET_AND     noreturn,
846
847 /* balloc.c */
848 extern int ext3_bg_has_super(struct super_block *sb, int group);
849 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
850 extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
851                         ext3_fsblk_t goal, int *errp);
852 extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
853                         ext3_fsblk_t goal, unsigned long *count, int *errp);
854 extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
855                         ext3_fsblk_t block, unsigned long count);
856 extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
857                                  ext3_fsblk_t block, unsigned long count,
858                                 unsigned long *pdquot_freed_blocks);
859 extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
860 extern void ext3_check_blocks_bitmap (struct super_block *);
861 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
862                                                     unsigned int block_group,
863                                                     struct buffer_head ** bh);
864 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
865 extern void ext3_init_block_alloc_info(struct inode *);
866 extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
867 extern int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range);
868
869 /* dir.c */
870 extern int ext3_check_dir_entry(const char *, struct inode *,
871                                 struct ext3_dir_entry_2 *,
872                                 struct buffer_head *, unsigned long);
873 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
874                                     __u32 minor_hash,
875                                     struct ext3_dir_entry_2 *dirent);
876 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
877
878 /* fsync.c */
879 extern int ext3_sync_file(struct file *, loff_t, loff_t, int);
880
881 /* hash.c */
882 extern int ext3fs_dirhash(const char *name, int len, struct
883                           dx_hash_info *hinfo);
884
885 /* ialloc.c */
886 extern struct inode * ext3_new_inode (handle_t *, struct inode *,
887                                       const struct qstr *, int);
888 extern void ext3_free_inode (handle_t *, struct inode *);
889 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
890 extern unsigned long ext3_count_free_inodes (struct super_block *);
891 extern unsigned long ext3_count_dirs (struct super_block *);
892 extern void ext3_check_inodes_bitmap (struct super_block *);
893 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
894
895
896 /* inode.c */
897 int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
898                 struct buffer_head *bh, ext3_fsblk_t blocknr);
899 struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
900 struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
901 int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
902         sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
903         int create);
904
905 extern struct inode *ext3_iget(struct super_block *, unsigned long);
906 extern int  ext3_write_inode (struct inode *, struct writeback_control *);
907 extern int  ext3_setattr (struct dentry *, struct iattr *);
908 extern void ext3_evict_inode (struct inode *);
909 extern int  ext3_sync_inode (handle_t *, struct inode *);
910 extern void ext3_discard_reservation (struct inode *);
911 extern void ext3_dirty_inode(struct inode *, int);
912 extern int ext3_change_inode_journal_flag(struct inode *, int);
913 extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
914 extern int ext3_can_truncate(struct inode *inode);
915 extern void ext3_truncate(struct inode *inode);
916 extern void ext3_set_inode_flags(struct inode *);
917 extern void ext3_get_inode_flags(struct ext3_inode_info *);
918 extern void ext3_set_aops(struct inode *inode);
919 extern int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
920                        u64 start, u64 len);
921
922 /* ioctl.c */
923 extern long ext3_ioctl(struct file *, unsigned int, unsigned long);
924 extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long);
925
926 /* namei.c */
927 extern int ext3_orphan_add(handle_t *, struct inode *);
928 extern int ext3_orphan_del(handle_t *, struct inode *);
929 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
930                                 __u32 start_minor_hash, __u32 *next_hash);
931
932 /* resize.c */
933 extern int ext3_group_add(struct super_block *sb,
934                                 struct ext3_new_group_data *input);
935 extern int ext3_group_extend(struct super_block *sb,
936                                 struct ext3_super_block *es,
937                                 ext3_fsblk_t n_blocks_count);
938
939 /* super.c */
940 extern void ext3_error (struct super_block *, const char *, const char *, ...)
941         __attribute__ ((format (printf, 3, 4)));
942 extern void __ext3_std_error (struct super_block *, const char *, int);
943 extern void ext3_abort (struct super_block *, const char *, const char *, ...)
944         __attribute__ ((format (printf, 3, 4)));
945 extern void ext3_warning (struct super_block *, const char *, const char *, ...)
946         __attribute__ ((format (printf, 3, 4)));
947 extern void ext3_msg(struct super_block *, const char *, const char *, ...)
948         __attribute__ ((format (printf, 3, 4)));
949 extern void ext3_update_dynamic_rev (struct super_block *sb);
950
951 #define ext3_std_error(sb, errno)                               \
952 do {                                                            \
953         if ((errno))                                            \
954                 __ext3_std_error((sb), __func__, (errno));      \
955 } while (0)
956
957 /*
958  * Inodes and files operations
959  */
960
961 /* dir.c */
962 extern const struct file_operations ext3_dir_operations;
963
964 /* file.c */
965 extern const struct inode_operations ext3_file_inode_operations;
966 extern const struct file_operations ext3_file_operations;
967
968 /* namei.c */
969 extern const struct inode_operations ext3_dir_inode_operations;
970 extern const struct inode_operations ext3_special_inode_operations;
971
972 /* symlink.c */
973 extern const struct inode_operations ext3_symlink_inode_operations;
974 extern const struct inode_operations ext3_fast_symlink_inode_operations;
975
976
977 #endif  /* __KERNEL__ */
978
979 #endif  /* _LINUX_EXT3_FS_H */