Commit | Line | Data |
---|---|---|
9e975dae OH |
1 | #ifndef _FAT_H |
2 | #define _FAT_H | |
3 | ||
4 | #include <linux/buffer_head.h> | |
5 | #include <linux/string.h> | |
6 | #include <linux/nls.h> | |
7 | #include <linux/fs.h> | |
7669e8fb | 8 | #include <linux/hash.h> |
9e975dae | 9 | #include <linux/mutex.h> |
aaa04b48 | 10 | #include <linux/ratelimit.h> |
9e975dae OH |
11 | #include <linux/msdos_fs.h> |
12 | ||
13 | /* | |
14 | * vfat shortname flags | |
15 | */ | |
16 | #define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */ | |
17 | #define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */ | |
18 | #define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */ | |
19 | #define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */ | |
20 | #define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */ | |
21 | ||
85c78591 DK |
22 | #define FAT_ERRORS_CONT 1 /* ignore error and continue */ |
23 | #define FAT_ERRORS_PANIC 2 /* panic on error */ | |
24 | #define FAT_ERRORS_RO 3 /* remount r/o on error */ | |
25 | ||
2628b7a6 NJ |
26 | #define FAT_NFS_STALE_RW 1 /* NFS RW support, can cause ESTALE */ |
27 | #define FAT_NFS_NOSTALE_RO 2 /* NFS RO support, no ESTALE issue */ | |
28 | ||
9e975dae | 29 | struct fat_mount_options { |
170782eb EB |
30 | kuid_t fs_uid; |
31 | kgid_t fs_gid; | |
9e975dae OH |
32 | unsigned short fs_fmask; |
33 | unsigned short fs_dmask; | |
4a3aeb13 | 34 | unsigned short codepage; /* Codepage for shortname conversions */ |
58156c8f | 35 | int time_offset; /* Offset of timestamps from UTC (in minutes) */ |
4a3aeb13 CJB |
36 | char *iocharset; /* Charset used for filename input/display */ |
37 | unsigned short shortname; /* flags for shortname display/create rule */ | |
38 | unsigned char name_check; /* r = relaxed, n = normal, s = strict */ | |
39 | unsigned char errors; /* On error: continue, panic, remount-ro */ | |
2628b7a6 | 40 | unsigned char nfs; /* NFS support: nostale_ro, stale_rw */ |
9e975dae | 41 | unsigned short allow_utime;/* permission for setting the [am]time */ |
4a3aeb13 CJB |
42 | unsigned quiet:1, /* set = fake successful chmods and chowns */ |
43 | showexec:1, /* set = only set x bit for com/exe/bat */ | |
44 | sys_immutable:1, /* set = system files are immutable */ | |
45 | dotsOK:1, /* set = hidden and system files are named '.filename' */ | |
46 | isvfat:1, /* 0=no vfat long filename support, 1=vfat support */ | |
47 | utf8:1, /* Use of UTF-8 character set (Default) */ | |
48 | unicode_xlate:1, /* create escape sequences for unhandled Unicode */ | |
49 | numtail:1, /* Does first alias have a numeric '~1' type tail? */ | |
50 | flush:1, /* write things quickly */ | |
51 | nocase:1, /* Does this need case conversion? 0=need case conversion*/ | |
52 | usefree:1, /* Use free_clusters for FAT32 */ | |
58156c8f | 53 | tz_set:1, /* Filesystem timestamps' offset set */ |
4a3aeb13 | 54 | rodir:1, /* allow ATTR_RO for directory */ |
2628b7a6 | 55 | discard:1; /* Issue discard requests on deletions */ |
9e975dae OH |
56 | }; |
57 | ||
58 | #define FAT_HASH_BITS 8 | |
59 | #define FAT_HASH_SIZE (1UL << FAT_HASH_BITS) | |
9e975dae OH |
60 | |
61 | /* | |
62 | * MS-DOS file system in-core superblock data | |
63 | */ | |
64 | struct msdos_sb_info { | |
4a3aeb13 CJB |
65 | unsigned short sec_per_clus; /* sectors/cluster */ |
66 | unsigned short cluster_bits; /* log2(cluster_size) */ | |
67 | unsigned int cluster_size; /* cluster size */ | |
d5a4a386 | 68 | unsigned char fats, fat_bits; /* number of FATs, FAT bits (12 or 16) */ |
9e975dae | 69 | unsigned short fat_start; |
4a3aeb13 | 70 | unsigned long fat_length; /* FAT start & length (sec.) */ |
9e975dae | 71 | unsigned long dir_start; |
4a3aeb13 CJB |
72 | unsigned short dir_entries; /* root dir start & entries */ |
73 | unsigned long data_start; /* first data sector */ | |
74 | unsigned long max_cluster; /* maximum cluster number */ | |
75 | unsigned long root_cluster; /* first cluster of the root directory */ | |
76 | unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */ | |
9e975dae | 77 | struct mutex fat_lock; |
8fceb4e0 | 78 | struct mutex nfs_build_inode_lock; |
e40b34c7 MS |
79 | struct mutex s_lock; |
80 | unsigned int prev_free; /* previously allocated cluster number */ | |
81 | unsigned int free_clusters; /* -1 if undefined */ | |
9e975dae OH |
82 | unsigned int free_clus_valid; /* is free_clusters valid? */ |
83 | struct fat_mount_options options; | |
4a3aeb13 CJB |
84 | struct nls_table *nls_disk; /* Codepage used on disk */ |
85 | struct nls_table *nls_io; /* Charset used for input and display */ | |
86 | const void *dir_ops; /* Opaque; default directory operations */ | |
87 | int dir_per_block; /* dir entries per block */ | |
88 | int dir_per_block_bits; /* log2(dir_per_block) */ | |
6e5b93ee | 89 | unsigned int vol_id; /*volume ID*/ |
9e975dae OH |
90 | |
91 | int fatent_shift; | |
92 | struct fatent_operations *fatent_ops; | |
b522412a | 93 | struct inode *fat_inode; |
020ac5b6 | 94 | struct inode *fsinfo_inode; |
9e975dae | 95 | |
aaa04b48 OH |
96 | struct ratelimit_state ratelimit; |
97 | ||
9e975dae OH |
98 | spinlock_t inode_hash_lock; |
99 | struct hlist_head inode_hashtable[FAT_HASH_SIZE]; | |
7669e8fb SM |
100 | |
101 | spinlock_t dir_hash_lock; | |
102 | struct hlist_head dir_hashtable[FAT_HASH_SIZE]; | |
b88a1058 OR |
103 | |
104 | unsigned int dirty; /* fs state before mount */ | |
cac45b06 | 105 | struct rcu_head rcu; |
9e975dae OH |
106 | }; |
107 | ||
108 | #define FAT_CACHE_VALID 0 /* special case for valid cache */ | |
109 | ||
110 | /* | |
111 | * MS-DOS file system inode data in memory | |
112 | */ | |
113 | struct msdos_inode_info { | |
114 | spinlock_t cache_lru_lock; | |
115 | struct list_head cache_lru; | |
116 | int nr_caches; | |
117 | /* for avoiding the race between fat_free() and fat_get_cluster() */ | |
118 | unsigned int cache_valid_id; | |
119 | ||
2bdf67eb OH |
120 | /* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */ |
121 | loff_t mmu_private; /* physically allocated size */ | |
122 | ||
9e975dae OH |
123 | int i_start; /* first cluster or 0 */ |
124 | int i_logstart; /* logical first cluster */ | |
125 | int i_attrs; /* unused attribute bits */ | |
126 | loff_t i_pos; /* on-disk position of directory entry or 0 */ | |
127 | struct hlist_node i_fat_hash; /* hash by i_location */ | |
7669e8fb | 128 | struct hlist_node i_dir_hash; /* hash by i_logstart */ |
58268691 | 129 | struct rw_semaphore truncate_lock; /* protect bmap against truncate */ |
9e975dae OH |
130 | struct inode vfs_inode; |
131 | }; | |
132 | ||
133 | struct fat_slot_info { | |
134 | loff_t i_pos; /* on-disk position of directory entry */ | |
135 | loff_t slot_off; /* offset for slot or de start */ | |
136 | int nr_slots; /* number of slots + 1(de) in filename */ | |
137 | struct msdos_dir_entry *de; | |
138 | struct buffer_head *bh; | |
139 | }; | |
140 | ||
141 | static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb) | |
142 | { | |
143 | return sb->s_fs_info; | |
144 | } | |
145 | ||
146 | static inline struct msdos_inode_info *MSDOS_I(struct inode *inode) | |
147 | { | |
148 | return container_of(inode, struct msdos_inode_info, vfs_inode); | |
149 | } | |
150 | ||
9183482f OH |
151 | /* |
152 | * If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to | |
153 | * save ATTR_RO instead of ->i_mode. | |
dfc209c0 OH |
154 | * |
155 | * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only | |
156 | * bit, it's just used as flag for app. | |
9183482f OH |
157 | */ |
158 | static inline int fat_mode_can_hold_ro(struct inode *inode) | |
159 | { | |
160 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
dacd0e7b | 161 | umode_t mask; |
9183482f | 162 | |
dfc209c0 OH |
163 | if (S_ISDIR(inode->i_mode)) { |
164 | if (!sbi->options.rodir) | |
165 | return 0; | |
9183482f | 166 | mask = ~sbi->options.fs_dmask; |
dfc209c0 | 167 | } else |
9183482f OH |
168 | mask = ~sbi->options.fs_fmask; |
169 | ||
170 | if (!(mask & S_IWUGO)) | |
171 | return 0; | |
172 | return 1; | |
173 | } | |
174 | ||
9c0aa1b8 | 175 | /* Convert attribute bits and a mask to the UNIX mode. */ |
dacd0e7b AV |
176 | static inline umode_t fat_make_mode(struct msdos_sb_info *sbi, |
177 | u8 attrs, umode_t mode) | |
9c0aa1b8 | 178 | { |
dfc209c0 | 179 | if (attrs & ATTR_RO && !((attrs & ATTR_DIR) && !sbi->options.rodir)) |
9c0aa1b8 OH |
180 | mode &= ~S_IWUGO; |
181 | ||
182 | if (attrs & ATTR_DIR) | |
183 | return (mode & ~sbi->options.fs_dmask) | S_IFDIR; | |
184 | else | |
185 | return (mode & ~sbi->options.fs_fmask) | S_IFREG; | |
186 | } | |
187 | ||
9e975dae | 188 | /* Return the FAT attribute byte for this inode */ |
9c0aa1b8 | 189 | static inline u8 fat_make_attrs(struct inode *inode) |
9e975dae | 190 | { |
9183482f OH |
191 | u8 attrs = MSDOS_I(inode)->i_attrs; |
192 | if (S_ISDIR(inode->i_mode)) | |
193 | attrs |= ATTR_DIR; | |
194 | if (fat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO)) | |
195 | attrs |= ATTR_RO; | |
196 | return attrs; | |
9e975dae OH |
197 | } |
198 | ||
9c0aa1b8 OH |
199 | static inline void fat_save_attrs(struct inode *inode, u8 attrs) |
200 | { | |
9183482f OH |
201 | if (fat_mode_can_hold_ro(inode)) |
202 | MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED; | |
203 | else | |
204 | MSDOS_I(inode)->i_attrs = attrs & (ATTR_UNUSED | ATTR_RO); | |
9c0aa1b8 OH |
205 | } |
206 | ||
9e975dae OH |
207 | static inline unsigned char fat_checksum(const __u8 *name) |
208 | { | |
209 | unsigned char s = name[0]; | |
210 | s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2]; | |
211 | s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4]; | |
212 | s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6]; | |
213 | s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8]; | |
214 | s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10]; | |
215 | return s; | |
216 | } | |
217 | ||
218 | static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus) | |
219 | { | |
220 | return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus | |
221 | + sbi->data_start; | |
222 | } | |
223 | ||
e22a4442 NJ |
224 | static inline void fat_get_blknr_offset(struct msdos_sb_info *sbi, |
225 | loff_t i_pos, sector_t *blknr, int *offset) | |
226 | { | |
227 | *blknr = i_pos >> sbi->dir_per_block_bits; | |
228 | *offset = i_pos & (sbi->dir_per_block - 1); | |
229 | } | |
230 | ||
f21735d5 NJ |
231 | static inline loff_t fat_i_pos_read(struct msdos_sb_info *sbi, |
232 | struct inode *inode) | |
233 | { | |
234 | loff_t i_pos; | |
235 | #if BITS_PER_LONG == 32 | |
236 | spin_lock(&sbi->inode_hash_lock); | |
237 | #endif | |
238 | i_pos = MSDOS_I(inode)->i_pos; | |
239 | #if BITS_PER_LONG == 32 | |
240 | spin_unlock(&sbi->inode_hash_lock); | |
241 | #endif | |
242 | return i_pos; | |
243 | } | |
244 | ||
9e975dae OH |
245 | static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len) |
246 | { | |
247 | #ifdef __BIG_ENDIAN | |
248 | while (len--) { | |
249 | *dst++ = src[0] | (src[1] << 8); | |
250 | src += 2; | |
251 | } | |
252 | #else | |
253 | memcpy(dst, src, len * 2); | |
254 | #endif | |
255 | } | |
256 | ||
a943ed71 SM |
257 | static inline int fat_get_start(const struct msdos_sb_info *sbi, |
258 | const struct msdos_dir_entry *de) | |
259 | { | |
260 | int cluster = le16_to_cpu(de->start); | |
261 | if (sbi->fat_bits == 32) | |
262 | cluster |= (le16_to_cpu(de->starthi) << 16); | |
263 | return cluster; | |
264 | } | |
265 | ||
266 | static inline void fat_set_start(struct msdos_dir_entry *de, int cluster) | |
267 | { | |
268 | de->start = cpu_to_le16(cluster); | |
269 | de->starthi = cpu_to_le16(cluster >> 16); | |
270 | } | |
271 | ||
9e975dae OH |
272 | static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len) |
273 | { | |
274 | #ifdef __BIG_ENDIAN | |
275 | while (len--) { | |
276 | dst[0] = *src & 0x00FF; | |
277 | dst[1] = (*src & 0xFF00) >> 8; | |
278 | dst += 2; | |
279 | src++; | |
280 | } | |
281 | #else | |
282 | memcpy(dst, src, len * 2); | |
283 | #endif | |
284 | } | |
285 | ||
286 | /* fat/cache.c */ | |
287 | extern void fat_cache_inval_inode(struct inode *inode); | |
288 | extern int fat_get_cluster(struct inode *inode, int cluster, | |
289 | int *fclus, int *dclus); | |
290 | extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys, | |
2bdf67eb | 291 | unsigned long *mapped_blocks, int create); |
9e975dae OH |
292 | |
293 | /* fat/dir.c */ | |
294 | extern const struct file_operations fat_dir_operations; | |
295 | extern int fat_search_long(struct inode *inode, const unsigned char *name, | |
296 | int name_len, struct fat_slot_info *sinfo); | |
297 | extern int fat_dir_empty(struct inode *dir); | |
298 | extern int fat_subdirs(struct inode *dir); | |
299 | extern int fat_scan(struct inode *dir, const unsigned char *name, | |
300 | struct fat_slot_info *sinfo); | |
f1e6fb0a NJ |
301 | extern int fat_scan_logstart(struct inode *dir, int i_logstart, |
302 | struct fat_slot_info *sinfo); | |
9e975dae | 303 | extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, |
7669e8fb | 304 | struct msdos_dir_entry **de); |
9e975dae OH |
305 | extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts); |
306 | extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots, | |
307 | struct fat_slot_info *sinfo); | |
308 | extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo); | |
309 | ||
310 | /* fat/fatent.c */ | |
311 | struct fat_entry { | |
312 | int entry; | |
313 | union { | |
314 | u8 *ent12_p[2]; | |
315 | __le16 *ent16_p; | |
316 | __le32 *ent32_p; | |
317 | } u; | |
318 | int nr_bhs; | |
319 | struct buffer_head *bhs[2]; | |
b522412a | 320 | struct inode *fat_inode; |
9e975dae OH |
321 | }; |
322 | ||
323 | static inline void fatent_init(struct fat_entry *fatent) | |
324 | { | |
325 | fatent->nr_bhs = 0; | |
326 | fatent->entry = 0; | |
327 | fatent->u.ent32_p = NULL; | |
328 | fatent->bhs[0] = fatent->bhs[1] = NULL; | |
b522412a | 329 | fatent->fat_inode = NULL; |
9e975dae OH |
330 | } |
331 | ||
332 | static inline void fatent_set_entry(struct fat_entry *fatent, int entry) | |
333 | { | |
334 | fatent->entry = entry; | |
335 | fatent->u.ent32_p = NULL; | |
336 | } | |
337 | ||
338 | static inline void fatent_brelse(struct fat_entry *fatent) | |
339 | { | |
340 | int i; | |
341 | fatent->u.ent32_p = NULL; | |
342 | for (i = 0; i < fatent->nr_bhs; i++) | |
343 | brelse(fatent->bhs[i]); | |
344 | fatent->nr_bhs = 0; | |
345 | fatent->bhs[0] = fatent->bhs[1] = NULL; | |
b522412a | 346 | fatent->fat_inode = NULL; |
9e975dae OH |
347 | } |
348 | ||
349 | extern void fat_ent_access_init(struct super_block *sb); | |
350 | extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent, | |
351 | int entry); | |
352 | extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent, | |
353 | int new, int wait); | |
354 | extern int fat_alloc_clusters(struct inode *inode, int *cluster, | |
355 | int nr_cluster); | |
356 | extern int fat_free_clusters(struct inode *inode, int cluster); | |
357 | extern int fat_count_free_clusters(struct super_block *sb); | |
358 | ||
359 | /* fat/file.c */ | |
7845bc3e AB |
360 | extern long fat_generic_ioctl(struct file *filp, unsigned int cmd, |
361 | unsigned long arg); | |
9e975dae OH |
362 | extern const struct file_operations fat_file_operations; |
363 | extern const struct inode_operations fat_file_inode_operations; | |
d5a4a386 | 364 | extern int fat_setattr(struct dentry *dentry, struct iattr *attr); |
459f6ed3 | 365 | extern void fat_truncate_blocks(struct inode *inode, loff_t offset); |
9e975dae OH |
366 | extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, |
367 | struct kstat *stat); | |
02c24a82 JB |
368 | extern int fat_file_fsync(struct file *file, loff_t start, loff_t end, |
369 | int datasync); | |
9e975dae OH |
370 | |
371 | /* fat/inode.c */ | |
372 | extern void fat_attach(struct inode *inode, loff_t i_pos); | |
373 | extern void fat_detach(struct inode *inode); | |
374 | extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos); | |
375 | extern struct inode *fat_build_inode(struct super_block *sb, | |
376 | struct msdos_dir_entry *de, loff_t i_pos); | |
377 | extern int fat_sync_inode(struct inode *inode); | |
378 | extern int fat_fill_super(struct super_block *sb, void *data, int silent, | |
384f5c96 | 379 | int isvfat, void (*setup)(struct super_block *)); |
f1e6fb0a | 380 | extern int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de); |
9e975dae OH |
381 | |
382 | extern int fat_flush_inodes(struct super_block *sb, struct inode *i1, | |
d5a4a386 | 383 | struct inode *i2); |
7669e8fb | 384 | static inline unsigned long fat_dir_hash(int logstart) |
21b6633d | 385 | { |
7669e8fb | 386 | return hash_32(logstart, FAT_HASH_BITS); |
21b6633d SM |
387 | } |
388 | ||
9e975dae | 389 | /* fat/misc.c */ |
b9075fa9 JP |
390 | extern __printf(3, 4) __cold |
391 | void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...); | |
2c8a5ffb AF |
392 | #define fat_fs_error(sb, fmt, args...) \ |
393 | __fat_fs_error(sb, 1, fmt , ## args) | |
394 | #define fat_fs_error_ratelimit(sb, fmt, args...) \ | |
395 | __fat_fs_error(sb, __ratelimit(&MSDOS_SB(sb)->ratelimit), fmt , ## args) | |
b9075fa9 JP |
396 | __printf(3, 4) __cold |
397 | void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...); | |
b742c341 NJ |
398 | #define fat_msg_ratelimit(sb, level, fmt, args...) \ |
399 | do { \ | |
400 | if (__ratelimit(&MSDOS_SB(sb)->ratelimit)) \ | |
401 | fat_msg(sb, level, fmt, ## args); \ | |
402 | } while (0) | |
ed248b29 | 403 | extern int fat_clusters_flush(struct super_block *sb); |
9e975dae | 404 | extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster); |
7decd1cb OH |
405 | extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts, |
406 | __le16 __time, __le16 __date, u8 time_cs); | |
407 | extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts, | |
408 | __le16 *time, __le16 *date, u8 *time_cs); | |
9e975dae OH |
409 | extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs); |
410 | ||
411 | int fat_cache_init(void); | |
412 | void fat_cache_destroy(void); | |
413 | ||
21b6633d | 414 | /* fat/nfs.c */ |
ea3983ac NJ |
415 | extern const struct export_operations fat_export_ops; |
416 | extern const struct export_operations fat_export_ops_nostale; | |
21b6633d | 417 | |
c3302931 OH |
418 | /* helper for printk */ |
419 | typedef unsigned long long llu; | |
420 | ||
9e975dae | 421 | #endif /* !_FAT_H */ |