Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/vfat/namei.c | |
3 | * | |
4 | * Written 1992,1993 by Werner Almesberger | |
5 | * | |
6 | * Windows95/Windows NT compatible extended MSDOS filesystem | |
7 | * by Gordon Chaffee Copyright (C) 1995. Send bug reports for the | |
8 | * VFAT filesystem to <chaffee@cs.berkeley.edu>. Specify | |
9 | * what file operation caused you trouble and if you can duplicate | |
10 | * the problem, send a script that demonstrates it. | |
11 | * | |
12 | * Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de> | |
13 | * | |
14 | * Support Multibyte characters and cleanup by | |
15 | * OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
1da177e4 LT |
19 | #include <linux/ctype.h> |
20 | #include <linux/slab.h> | |
1da177e4 | 21 | #include <linux/namei.h> |
9e975dae | 22 | #include "fat.h" |
1da177e4 | 23 | |
1b524672 OH |
24 | /* |
25 | * If new entry was created in the parent, it could create the 8.3 | |
26 | * alias (the shortname of logname). So, the parent may have the | |
27 | * negative-dentry which matches the created 8.3 alias. | |
28 | * | |
29 | * If it happened, the negative dentry isn't actually negative | |
30 | * anymore. So, drop it. | |
31 | */ | |
32 | static int vfat_revalidate_shortname(struct dentry *dentry) | |
1da177e4 LT |
33 | { |
34 | int ret = 1; | |
1b524672 | 35 | spin_lock(&dentry->d_lock); |
2b0143b5 | 36 | if (dentry->d_time != d_inode(dentry->d_parent)->i_version) |
1da177e4 | 37 | ret = 0; |
1b524672 | 38 | spin_unlock(&dentry->d_lock); |
1da177e4 LT |
39 | return ret; |
40 | } | |
41 | ||
0b728e19 | 42 | static int vfat_revalidate(struct dentry *dentry, unsigned int flags) |
1b524672 | 43 | { |
0b728e19 | 44 | if (flags & LOOKUP_RCU) |
34286d66 NP |
45 | return -ECHILD; |
46 | ||
1b524672 | 47 | /* This is not negative dentry. Always valid. */ |
2b0143b5 | 48 | if (d_really_is_positive(dentry)) |
1b524672 OH |
49 | return 1; |
50 | return vfat_revalidate_shortname(dentry); | |
51 | } | |
52 | ||
0b728e19 | 53 | static int vfat_revalidate_ci(struct dentry *dentry, unsigned int flags) |
1b524672 | 54 | { |
0b728e19 | 55 | if (flags & LOOKUP_RCU) |
34286d66 NP |
56 | return -ECHILD; |
57 | ||
1b524672 OH |
58 | /* |
59 | * This is not negative dentry. Always valid. | |
60 | * | |
61 | * Note, rename() to existing directory entry will have ->d_inode, | |
62 | * and will use existing name which isn't specified name by user. | |
63 | * | |
64 | * We may be able to drop this positive dentry here. But dropping | |
65 | * positive dentry isn't good idea. So it's unsupported like | |
66 | * rename("filename", "FILENAME") for now. | |
67 | */ | |
2b0143b5 | 68 | if (d_really_is_positive(dentry)) |
1b524672 OH |
69 | return 1; |
70 | ||
71 | /* | |
72 | * This may be nfsd (or something), anyway, we can't see the | |
73 | * intent of this. So, since this can be for creation, drop it. | |
74 | */ | |
0b728e19 | 75 | if (!flags) |
1b524672 OH |
76 | return 0; |
77 | ||
78 | /* | |
79 | * Drop the negative dentry, in order to make sure to use the | |
80 | * case sensitive name which is specified by user if this is | |
81 | * for creation. | |
82 | */ | |
0b728e19 | 83 | if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
407938e7 | 84 | return 0; |
1b524672 OH |
85 | |
86 | return vfat_revalidate_shortname(dentry); | |
87 | } | |
88 | ||
1da177e4 | 89 | /* returns the length of a struct qstr, ignoring trailing dots */ |
621e155a | 90 | static unsigned int __vfat_striptail_len(unsigned int len, const char *name) |
1da177e4 | 91 | { |
621e155a | 92 | while (len && name[len - 1] == '.') |
1da177e4 LT |
93 | len--; |
94 | return len; | |
95 | } | |
96 | ||
621e155a NP |
97 | static unsigned int vfat_striptail_len(const struct qstr *qstr) |
98 | { | |
99 | return __vfat_striptail_len(qstr->len, qstr->name); | |
100 | } | |
101 | ||
1da177e4 LT |
102 | /* |
103 | * Compute the hash for the vfat name corresponding to the dentry. | |
104 | * Note: if the name is invalid, we leave the hash code unchanged so | |
105 | * that the existing dentry can be used. The vfat fs routines will | |
106 | * return ENOENT or EINVAL as appropriate. | |
107 | */ | |
da53be12 | 108 | static int vfat_hash(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 LT |
109 | { |
110 | qstr->hash = full_name_hash(qstr->name, vfat_striptail_len(qstr)); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | /* | |
115 | * Compute the hash for the vfat name corresponding to the dentry. | |
116 | * Note: if the name is invalid, we leave the hash code unchanged so | |
117 | * that the existing dentry can be used. The vfat fs routines will | |
118 | * return ENOENT or EINVAL as appropriate. | |
119 | */ | |
da53be12 | 120 | static int vfat_hashi(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 | 121 | { |
b1e6a015 | 122 | struct nls_table *t = MSDOS_SB(dentry->d_sb)->nls_io; |
1da177e4 LT |
123 | const unsigned char *name; |
124 | unsigned int len; | |
125 | unsigned long hash; | |
126 | ||
127 | name = qstr->name; | |
128 | len = vfat_striptail_len(qstr); | |
129 | ||
130 | hash = init_name_hash(); | |
131 | while (len--) | |
132 | hash = partial_name_hash(nls_tolower(t, *name++), hash); | |
133 | qstr->hash = end_name_hash(hash); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Case insensitive compare of two vfat names. | |
140 | */ | |
da53be12 | 141 | static int vfat_cmpi(const struct dentry *parent, const struct dentry *dentry, |
621e155a | 142 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 143 | { |
621e155a | 144 | struct nls_table *t = MSDOS_SB(parent->d_sb)->nls_io; |
1da177e4 LT |
145 | unsigned int alen, blen; |
146 | ||
147 | /* A filename cannot end in '.' or we treat it like it has none */ | |
621e155a NP |
148 | alen = vfat_striptail_len(name); |
149 | blen = __vfat_striptail_len(len, str); | |
1da177e4 | 150 | if (alen == blen) { |
621e155a | 151 | if (nls_strnicmp(t, name->name, str, alen) == 0) |
1da177e4 LT |
152 | return 0; |
153 | } | |
154 | return 1; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Case sensitive compare of two vfat names. | |
159 | */ | |
da53be12 | 160 | static int vfat_cmp(const struct dentry *parent, const struct dentry *dentry, |
621e155a | 161 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 LT |
162 | { |
163 | unsigned int alen, blen; | |
164 | ||
165 | /* A filename cannot end in '.' or we treat it like it has none */ | |
621e155a NP |
166 | alen = vfat_striptail_len(name); |
167 | blen = __vfat_striptail_len(len, str); | |
1da177e4 | 168 | if (alen == blen) { |
621e155a | 169 | if (strncmp(name->name, str, alen) == 0) |
1da177e4 LT |
170 | return 0; |
171 | } | |
172 | return 1; | |
173 | } | |
174 | ||
ce6cdc47 | 175 | static const struct dentry_operations vfat_ci_dentry_ops = { |
1b524672 OH |
176 | .d_revalidate = vfat_revalidate_ci, |
177 | .d_hash = vfat_hashi, | |
178 | .d_compare = vfat_cmpi, | |
179 | }; | |
180 | ||
ce6cdc47 | 181 | static const struct dentry_operations vfat_dentry_ops = { |
1b524672 OH |
182 | .d_revalidate = vfat_revalidate, |
183 | .d_hash = vfat_hash, | |
184 | .d_compare = vfat_cmp, | |
1da177e4 LT |
185 | }; |
186 | ||
187 | /* Characters that are undesirable in an MS-DOS file name */ | |
188 | ||
189 | static inline wchar_t vfat_bad_char(wchar_t w) | |
190 | { | |
191 | return (w < 0x0020) | |
192 | || (w == '*') || (w == '?') || (w == '<') || (w == '>') | |
193 | || (w == '|') || (w == '"') || (w == ':') || (w == '/') | |
194 | || (w == '\\'); | |
195 | } | |
196 | ||
197 | static inline wchar_t vfat_replace_char(wchar_t w) | |
198 | { | |
199 | return (w == '[') || (w == ']') || (w == ';') || (w == ',') | |
200 | || (w == '+') || (w == '='); | |
201 | } | |
202 | ||
203 | static wchar_t vfat_skip_char(wchar_t w) | |
204 | { | |
205 | return (w == '.') || (w == ' '); | |
206 | } | |
207 | ||
208 | static inline int vfat_is_used_badchars(const wchar_t *s, int len) | |
209 | { | |
210 | int i; | |
211 | ||
212 | for (i = 0; i < len; i++) | |
213 | if (vfat_bad_char(s[i])) | |
214 | return -EINVAL; | |
1da177e4 | 215 | |
f22032ba | 216 | if (s[i - 1] == ' ') /* last character cannot be space */ |
1da177e4 | 217 | return -EINVAL; |
f22032ba | 218 | |
1da177e4 LT |
219 | return 0; |
220 | } | |
221 | ||
222 | static int vfat_find_form(struct inode *dir, unsigned char *name) | |
223 | { | |
224 | struct fat_slot_info sinfo; | |
225 | int err = fat_scan(dir, name, &sinfo); | |
226 | if (err) | |
227 | return -ENOENT; | |
228 | brelse(sinfo.bh); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | /* | |
233 | * 1) Valid characters for the 8.3 format alias are any combination of | |
234 | * letters, uppercase alphabets, digits, any of the | |
235 | * following special characters: | |
236 | * $ % ' ` - @ { } ~ ! # ( ) & _ ^ | |
237 | * In this case Longfilename is not stored in disk. | |
238 | * | |
239 | * WinNT's Extension: | |
240 | * File name and extension name is contain uppercase/lowercase | |
241 | * only. And it is expressed by CASE_LOWER_BASE and CASE_LOWER_EXT. | |
242 | * | |
243 | * 2) File name is 8.3 format, but it contain the uppercase and | |
244 | * lowercase char, muliti bytes char, etc. In this case numtail is not | |
245 | * added, but Longfilename is stored. | |
246 | * | |
247 | * 3) When the one except for the above, or the following special | |
248 | * character are contained: | |
249 | * . [ ] ; , + = | |
250 | * numtail is added, and Longfilename must be stored in disk . | |
251 | */ | |
252 | struct shortname_info { | |
253 | unsigned char lower:1, | |
254 | upper:1, | |
255 | valid:1; | |
256 | }; | |
257 | #define INIT_SHORTNAME_INFO(x) do { \ | |
258 | (x)->lower = 1; \ | |
259 | (x)->upper = 1; \ | |
260 | (x)->valid = 1; \ | |
261 | } while (0) | |
262 | ||
263 | static inline int to_shortname_char(struct nls_table *nls, | |
264 | unsigned char *buf, int buf_size, | |
265 | wchar_t *src, struct shortname_info *info) | |
266 | { | |
267 | int len; | |
268 | ||
269 | if (vfat_skip_char(*src)) { | |
270 | info->valid = 0; | |
271 | return 0; | |
272 | } | |
273 | if (vfat_replace_char(*src)) { | |
274 | info->valid = 0; | |
275 | buf[0] = '_'; | |
276 | return 1; | |
277 | } | |
278 | ||
279 | len = nls->uni2char(*src, buf, buf_size); | |
280 | if (len <= 0) { | |
281 | info->valid = 0; | |
282 | buf[0] = '_'; | |
283 | len = 1; | |
284 | } else if (len == 1) { | |
285 | unsigned char prev = buf[0]; | |
286 | ||
287 | if (buf[0] >= 0x7F) { | |
288 | info->lower = 0; | |
289 | info->upper = 0; | |
290 | } | |
291 | ||
292 | buf[0] = nls_toupper(nls, buf[0]); | |
293 | if (isalpha(buf[0])) { | |
294 | if (buf[0] == prev) | |
295 | info->lower = 0; | |
296 | else | |
297 | info->upper = 0; | |
298 | } | |
299 | } else { | |
300 | info->lower = 0; | |
301 | info->upper = 0; | |
302 | } | |
303 | ||
304 | return len; | |
305 | } | |
306 | ||
307 | /* | |
308 | * Given a valid longname, create a unique shortname. Make sure the | |
309 | * shortname does not exist | |
310 | * Returns negative number on error, 0 for a normal | |
311 | * return, and 1 for valid shortname | |
312 | */ | |
313 | static int vfat_create_shortname(struct inode *dir, struct nls_table *nls, | |
314 | wchar_t *uname, int ulen, | |
315 | unsigned char *name_res, unsigned char *lcase) | |
316 | { | |
317 | struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options; | |
318 | wchar_t *ip, *ext_start, *end, *name_start; | |
30d1872d | 319 | unsigned char base[9], ext[4], buf[5], *p; |
1da177e4 LT |
320 | unsigned char charbuf[NLS_MAX_CHARSET_SIZE]; |
321 | int chl, chi; | |
322 | int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen; | |
323 | int is_shortname; | |
324 | struct shortname_info base_info, ext_info; | |
325 | ||
326 | is_shortname = 1; | |
327 | INIT_SHORTNAME_INFO(&base_info); | |
328 | INIT_SHORTNAME_INFO(&ext_info); | |
329 | ||
330 | /* Now, we need to create a shortname from the long name */ | |
331 | ext_start = end = &uname[ulen]; | |
332 | while (--ext_start >= uname) { | |
333 | if (*ext_start == 0x002E) { /* is `.' */ | |
334 | if (ext_start == end - 1) { | |
335 | sz = ulen; | |
336 | ext_start = NULL; | |
337 | } | |
338 | break; | |
339 | } | |
340 | } | |
341 | ||
342 | if (ext_start == uname - 1) { | |
343 | sz = ulen; | |
344 | ext_start = NULL; | |
345 | } else if (ext_start) { | |
346 | /* | |
347 | * Names which start with a dot could be just | |
348 | * an extension eg. "...test". In this case Win95 | |
349 | * uses the extension as the name and sets no extension. | |
350 | */ | |
351 | name_start = &uname[0]; | |
352 | while (name_start < ext_start) { | |
353 | if (!vfat_skip_char(*name_start)) | |
354 | break; | |
355 | name_start++; | |
356 | } | |
357 | if (name_start != ext_start) { | |
358 | sz = ext_start - uname; | |
359 | ext_start++; | |
360 | } else { | |
361 | sz = ulen; | |
362 | ext_start = NULL; | |
363 | } | |
364 | } | |
365 | ||
366 | numtail_baselen = 6; | |
367 | numtail2_baselen = 2; | |
368 | for (baselen = i = 0, p = base, ip = uname; i < sz; i++, ip++) { | |
369 | chl = to_shortname_char(nls, charbuf, sizeof(charbuf), | |
370 | ip, &base_info); | |
371 | if (chl == 0) | |
372 | continue; | |
373 | ||
374 | if (baselen < 2 && (baselen + chl) > 2) | |
375 | numtail2_baselen = baselen; | |
376 | if (baselen < 6 && (baselen + chl) > 6) | |
377 | numtail_baselen = baselen; | |
378 | for (chi = 0; chi < chl; chi++) { | |
379 | *p++ = charbuf[chi]; | |
380 | baselen++; | |
381 | if (baselen >= 8) | |
382 | break; | |
383 | } | |
384 | if (baselen >= 8) { | |
385 | if ((chi < chl - 1) || (ip + 1) - uname < sz) | |
386 | is_shortname = 0; | |
387 | break; | |
388 | } | |
389 | } | |
390 | if (baselen == 0) { | |
391 | return -EINVAL; | |
392 | } | |
393 | ||
394 | extlen = 0; | |
395 | if (ext_start) { | |
396 | for (p = ext, ip = ext_start; extlen < 3 && ip < end; ip++) { | |
397 | chl = to_shortname_char(nls, charbuf, sizeof(charbuf), | |
398 | ip, &ext_info); | |
399 | if (chl == 0) | |
400 | continue; | |
401 | ||
402 | if ((extlen + chl) > 3) { | |
403 | is_shortname = 0; | |
404 | break; | |
405 | } | |
406 | for (chi = 0; chi < chl; chi++) { | |
407 | *p++ = charbuf[chi]; | |
408 | extlen++; | |
409 | } | |
410 | if (extlen >= 3) { | |
411 | if (ip + 1 != end) | |
412 | is_shortname = 0; | |
413 | break; | |
414 | } | |
415 | } | |
416 | } | |
417 | ext[extlen] = '\0'; | |
418 | base[baselen] = '\0'; | |
419 | ||
420 | /* Yes, it can happen. ".\xe5" would do it. */ | |
421 | if (base[0] == DELETED_FLAG) | |
422 | base[0] = 0x05; | |
423 | ||
424 | /* OK, at this point we know that base is not longer than 8 symbols, | |
425 | * ext is not longer than 3, base is nonempty, both don't contain | |
426 | * any bad symbols (lowercase transformed to uppercase). | |
427 | */ | |
428 | ||
429 | memset(name_res, ' ', MSDOS_NAME); | |
430 | memcpy(name_res, base, baselen); | |
431 | memcpy(name_res + 8, ext, extlen); | |
432 | *lcase = 0; | |
433 | if (is_shortname && base_info.valid && ext_info.valid) { | |
434 | if (vfat_find_form(dir, name_res) == 0) | |
435 | return -EEXIST; | |
436 | ||
437 | if (opts->shortname & VFAT_SFN_CREATE_WIN95) { | |
438 | return (base_info.upper && ext_info.upper); | |
439 | } else if (opts->shortname & VFAT_SFN_CREATE_WINNT) { | |
440 | if ((base_info.upper || base_info.lower) && | |
441 | (ext_info.upper || ext_info.lower)) { | |
442 | if (!base_info.upper && base_info.lower) | |
443 | *lcase |= CASE_LOWER_BASE; | |
444 | if (!ext_info.upper && ext_info.lower) | |
445 | *lcase |= CASE_LOWER_EXT; | |
446 | return 1; | |
447 | } | |
448 | return 0; | |
449 | } else { | |
450 | BUG(); | |
451 | } | |
452 | } | |
453 | ||
454 | if (opts->numtail == 0) | |
455 | if (vfat_find_form(dir, name_res) < 0) | |
456 | return 0; | |
457 | ||
458 | /* | |
459 | * Try to find a unique extension. This used to | |
460 | * iterate through all possibilities sequentially, | |
461 | * but that gave extremely bad performance. Windows | |
462 | * only tries a few cases before using random | |
463 | * values for part of the base. | |
464 | */ | |
465 | ||
466 | if (baselen > 6) { | |
467 | baselen = numtail_baselen; | |
468 | name_res[7] = ' '; | |
469 | } | |
470 | name_res[baselen] = '~'; | |
471 | for (i = 1; i < 10; i++) { | |
472 | name_res[baselen + 1] = i + '0'; | |
473 | if (vfat_find_form(dir, name_res) < 0) | |
474 | return 0; | |
475 | } | |
476 | ||
30d1872d | 477 | i = jiffies; |
1da177e4 LT |
478 | sz = (jiffies >> 16) & 0x7; |
479 | if (baselen > 2) { | |
480 | baselen = numtail2_baselen; | |
481 | name_res[7] = ' '; | |
482 | } | |
483 | name_res[baselen + 4] = '~'; | |
484 | name_res[baselen + 5] = '1' + sz; | |
485 | while (1) { | |
30d1872d | 486 | snprintf(buf, sizeof(buf), "%04X", i & 0xffff); |
1da177e4 LT |
487 | memcpy(&name_res[baselen], buf, 4); |
488 | if (vfat_find_form(dir, name_res) < 0) | |
489 | break; | |
490 | i -= 11; | |
491 | } | |
492 | return 0; | |
493 | } | |
494 | ||
495 | /* Translate a string, including coded sequences into Unicode */ | |
496 | static int | |
497 | xlate_to_uni(const unsigned char *name, int len, unsigned char *outname, | |
498 | int *longlen, int *outlen, int escape, int utf8, | |
499 | struct nls_table *nls) | |
500 | { | |
501 | const unsigned char *ip; | |
502 | unsigned char nc; | |
503 | unsigned char *op; | |
504 | unsigned int ec; | |
505 | int i, k, fill; | |
506 | int charlen; | |
507 | ||
508 | if (utf8) { | |
0720a06a AS |
509 | *outlen = utf8s_to_utf16s(name, len, UTF16_HOST_ENDIAN, |
510 | (wchar_t *) outname, FAT_LFN_LEN + 2); | |
67638e40 OH |
511 | if (*outlen < 0) |
512 | return *outlen; | |
eeb5b4ae | 513 | else if (*outlen > FAT_LFN_LEN) |
f22032ba KM |
514 | return -ENAMETOOLONG; |
515 | ||
1da177e4 LT |
516 | op = &outname[*outlen * sizeof(wchar_t)]; |
517 | } else { | |
41f0c02e | 518 | for (i = 0, ip = name, op = outname, *outlen = 0; |
d533df07 | 519 | i < len && *outlen < FAT_LFN_LEN; |
41f0c02e NJ |
520 | *outlen += 1) { |
521 | if (escape && (*ip == ':')) { | |
522 | if (i > len - 5) | |
523 | return -EINVAL; | |
524 | ec = 0; | |
525 | for (k = 1; k < 5; k++) { | |
526 | nc = ip[k]; | |
527 | ec <<= 4; | |
528 | if (nc >= '0' && nc <= '9') { | |
529 | ec |= nc - '0'; | |
530 | continue; | |
1da177e4 | 531 | } |
41f0c02e NJ |
532 | if (nc >= 'a' && nc <= 'f') { |
533 | ec |= nc - ('a' - 10); | |
534 | continue; | |
535 | } | |
536 | if (nc >= 'A' && nc <= 'F') { | |
537 | ec |= nc - ('A' - 10); | |
538 | continue; | |
539 | } | |
540 | return -EINVAL; | |
1da177e4 | 541 | } |
41f0c02e NJ |
542 | *op++ = ec & 0xFF; |
543 | *op++ = ec >> 8; | |
544 | ip += 5; | |
545 | i += 5; | |
546 | } else { | |
547 | charlen = nls->char2uni(ip, len - i, | |
548 | (wchar_t *)op); | |
549 | if (charlen < 0) | |
550 | return -EINVAL; | |
551 | ip += charlen; | |
552 | i += charlen; | |
553 | op += 2; | |
1da177e4 | 554 | } |
1da177e4 | 555 | } |
41f0c02e NJ |
556 | if (i < len) |
557 | return -ENAMETOOLONG; | |
1da177e4 | 558 | } |
1da177e4 LT |
559 | |
560 | *longlen = *outlen; | |
561 | if (*outlen % 13) { | |
562 | *op++ = 0; | |
563 | *op++ = 0; | |
564 | *outlen += 1; | |
565 | if (*outlen % 13) { | |
566 | fill = 13 - (*outlen % 13); | |
567 | for (i = 0; i < fill; i++) { | |
568 | *op++ = 0xff; | |
569 | *op++ = 0xff; | |
570 | } | |
571 | *outlen += fill; | |
572 | } | |
573 | } | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static int vfat_build_slots(struct inode *dir, const unsigned char *name, | |
579 | int len, int is_dir, int cluster, | |
580 | struct timespec *ts, | |
581 | struct msdos_dir_slot *slots, int *nr_slots) | |
582 | { | |
583 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); | |
584 | struct fat_mount_options *opts = &sbi->options; | |
585 | struct msdos_dir_slot *ps; | |
586 | struct msdos_dir_entry *de; | |
1da177e4 LT |
587 | unsigned char cksum, lcase; |
588 | unsigned char msdos_name[MSDOS_NAME]; | |
589 | wchar_t *uname; | |
590 | __le16 time, date; | |
7decd1cb | 591 | u8 time_cs; |
1da177e4 LT |
592 | int err, ulen, usize, i; |
593 | loff_t offset; | |
594 | ||
595 | *nr_slots = 0; | |
1da177e4 | 596 | |
c7a6c4ed OH |
597 | uname = __getname(); |
598 | if (!uname) | |
1da177e4 LT |
599 | return -ENOMEM; |
600 | ||
1da177e4 LT |
601 | err = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize, |
602 | opts->unicode_xlate, opts->utf8, sbi->nls_io); | |
603 | if (err) | |
604 | goto out_free; | |
605 | ||
606 | err = vfat_is_used_badchars(uname, ulen); | |
607 | if (err) | |
608 | goto out_free; | |
609 | ||
610 | err = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen, | |
611 | msdos_name, &lcase); | |
612 | if (err < 0) | |
613 | goto out_free; | |
614 | else if (err == 1) { | |
615 | de = (struct msdos_dir_entry *)slots; | |
616 | err = 0; | |
617 | goto shortname; | |
618 | } | |
619 | ||
620 | /* build the entry of long file name */ | |
451cbaa1 | 621 | cksum = fat_checksum(msdos_name); |
1da177e4 LT |
622 | |
623 | *nr_slots = usize / 13; | |
624 | for (ps = slots, i = *nr_slots; i > 0; i--, ps++) { | |
625 | ps->id = i; | |
626 | ps->attr = ATTR_EXT; | |
627 | ps->reserved = 0; | |
628 | ps->alias_checksum = cksum; | |
629 | ps->start = 0; | |
630 | offset = (i - 1) * 13; | |
631 | fatwchar_to16(ps->name0_4, uname + offset, 5); | |
632 | fatwchar_to16(ps->name5_10, uname + offset + 5, 6); | |
633 | fatwchar_to16(ps->name11_12, uname + offset + 11, 2); | |
634 | } | |
635 | slots[0].id |= 0x40; | |
636 | de = (struct msdos_dir_entry *)ps; | |
637 | ||
638 | shortname: | |
639 | /* build the entry of 8.3 alias name */ | |
640 | (*nr_slots)++; | |
641 | memcpy(de->name, msdos_name, MSDOS_NAME); | |
642 | de->attr = is_dir ? ATTR_DIR : ATTR_ARCH; | |
643 | de->lcase = lcase; | |
7decd1cb | 644 | fat_time_unix2fat(sbi, ts, &time, &date, &time_cs); |
1da177e4 LT |
645 | de->time = de->ctime = time; |
646 | de->date = de->cdate = de->adate = date; | |
7decd1cb | 647 | de->ctime_cs = time_cs; |
a943ed71 | 648 | fat_set_start(de, cluster); |
1da177e4 LT |
649 | de->size = 0; |
650 | out_free: | |
c7a6c4ed | 651 | __putname(uname); |
1da177e4 LT |
652 | return err; |
653 | } | |
654 | ||
655 | static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir, | |
656 | int cluster, struct timespec *ts, | |
657 | struct fat_slot_info *sinfo) | |
658 | { | |
659 | struct msdos_dir_slot *slots; | |
660 | unsigned int len; | |
661 | int err, nr_slots; | |
662 | ||
663 | len = vfat_striptail_len(qname); | |
664 | if (len == 0) | |
665 | return -ENOENT; | |
666 | ||
8f593427 | 667 | slots = kmalloc(sizeof(*slots) * MSDOS_SLOTS, GFP_NOFS); |
1da177e4 LT |
668 | if (slots == NULL) |
669 | return -ENOMEM; | |
670 | ||
671 | err = vfat_build_slots(dir, qname->name, len, is_dir, cluster, ts, | |
672 | slots, &nr_slots); | |
673 | if (err) | |
674 | goto cleanup; | |
675 | ||
676 | err = fat_add_entries(dir, slots, nr_slots, sinfo); | |
677 | if (err) | |
678 | goto cleanup; | |
679 | ||
680 | /* update timestamp */ | |
681 | dir->i_ctime = dir->i_mtime = dir->i_atime = *ts; | |
682 | if (IS_DIRSYNC(dir)) | |
683 | (void)fat_sync_inode(dir); | |
684 | else | |
685 | mark_inode_dirty(dir); | |
686 | cleanup: | |
687 | kfree(slots); | |
688 | return err; | |
689 | } | |
690 | ||
691 | static int vfat_find(struct inode *dir, struct qstr *qname, | |
692 | struct fat_slot_info *sinfo) | |
693 | { | |
694 | unsigned int len = vfat_striptail_len(qname); | |
695 | if (len == 0) | |
696 | return -ENOENT; | |
697 | return fat_search_long(dir, qname->name, len, sinfo); | |
698 | } | |
699 | ||
8045e298 OH |
700 | /* |
701 | * (nfsd's) anonymous disconnected dentry? | |
702 | * NOTE: !IS_ROOT() is not anonymous (I.e. d_splice_alias() did the job). | |
703 | */ | |
704 | static int vfat_d_anon_disconn(struct dentry *dentry) | |
705 | { | |
706 | return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); | |
707 | } | |
708 | ||
1da177e4 | 709 | static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 710 | unsigned int flags) |
1da177e4 LT |
711 | { |
712 | struct super_block *sb = dir->i_sb; | |
713 | struct fat_slot_info sinfo; | |
068f5ae0 | 714 | struct inode *inode; |
1da177e4 | 715 | struct dentry *alias; |
1b524672 | 716 | int err; |
1da177e4 | 717 | |
e40b34c7 | 718 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
719 | |
720 | err = vfat_find(dir, &dentry->d_name, &sinfo); | |
721 | if (err) { | |
068f5ae0 | 722 | if (err == -ENOENT) { |
068f5ae0 OH |
723 | inode = NULL; |
724 | goto out; | |
725 | } | |
1da177e4 LT |
726 | goto error; |
727 | } | |
1b524672 | 728 | |
1da177e4 LT |
729 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
730 | brelse(sinfo.bh); | |
731 | if (IS_ERR(inode)) { | |
068f5ae0 OH |
732 | err = PTR_ERR(inode); |
733 | goto error; | |
1da177e4 | 734 | } |
1b524672 | 735 | |
1da177e4 | 736 | alias = d_find_alias(inode); |
1ead0e79 AV |
737 | /* |
738 | * Checking "alias->d_parent == dentry->d_parent" to make sure | |
739 | * FS is not corrupted (especially double linked dir). | |
740 | */ | |
741 | if (alias && alias->d_parent == dentry->d_parent && | |
742 | !vfat_d_anon_disconn(alias)) { | |
1b524672 | 743 | /* |
8045e298 OH |
744 | * This inode has non anonymous-DCACHE_DISCONNECTED |
745 | * dentry. This means, the user did ->lookup() by an | |
746 | * another name (longname vs 8.3 alias of it) in past. | |
1b524672 OH |
747 | * |
748 | * Switch to new one for reason of locality if possible. | |
749 | */ | |
1c13a243 OH |
750 | BUG_ON(d_unhashed(alias)); |
751 | if (!S_ISDIR(inode->i_mode)) | |
752 | d_move(alias, dentry); | |
753 | iput(inode); | |
e40b34c7 | 754 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
1c13a243 | 755 | return alias; |
8045e298 OH |
756 | } else |
757 | dput(alias); | |
758 | ||
068f5ae0 | 759 | out: |
e40b34c7 | 760 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
1ead0e79 AV |
761 | if (!inode) |
762 | dentry->d_time = dir->i_version; | |
763 | return d_splice_alias(inode, dentry); | |
068f5ae0 | 764 | error: |
e40b34c7 | 765 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
068f5ae0 | 766 | return ERR_PTR(err); |
1da177e4 LT |
767 | } |
768 | ||
4acdaf27 | 769 | static int vfat_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 770 | bool excl) |
1da177e4 LT |
771 | { |
772 | struct super_block *sb = dir->i_sb; | |
773 | struct inode *inode; | |
774 | struct fat_slot_info sinfo; | |
775 | struct timespec ts; | |
776 | int err; | |
777 | ||
e40b34c7 | 778 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
779 | |
780 | ts = CURRENT_TIME_SEC; | |
781 | err = vfat_add_entry(dir, &dentry->d_name, 0, 0, &ts, &sinfo); | |
782 | if (err) | |
783 | goto out; | |
784 | dir->i_version++; | |
785 | ||
786 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
787 | brelse(sinfo.bh); | |
788 | if (IS_ERR(inode)) { | |
789 | err = PTR_ERR(inode); | |
790 | goto out; | |
791 | } | |
792 | inode->i_version++; | |
793 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
794 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
795 | ||
1da177e4 LT |
796 | d_instantiate(dentry, inode); |
797 | out: | |
e40b34c7 | 798 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
799 | return err; |
800 | } | |
801 | ||
802 | static int vfat_rmdir(struct inode *dir, struct dentry *dentry) | |
803 | { | |
2b0143b5 | 804 | struct inode *inode = d_inode(dentry); |
8f593427 | 805 | struct super_block *sb = dir->i_sb; |
1da177e4 LT |
806 | struct fat_slot_info sinfo; |
807 | int err; | |
808 | ||
e40b34c7 | 809 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
810 | |
811 | err = fat_dir_empty(inode); | |
812 | if (err) | |
813 | goto out; | |
814 | err = vfat_find(dir, &dentry->d_name, &sinfo); | |
815 | if (err) | |
816 | goto out; | |
817 | ||
818 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
819 | if (err) | |
820 | goto out; | |
9a53c3a7 | 821 | drop_nlink(dir); |
1da177e4 | 822 | |
ce71ec36 | 823 | clear_nlink(inode); |
1da177e4 LT |
824 | inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC; |
825 | fat_detach(inode); | |
1ead0e79 | 826 | dentry->d_time = dir->i_version; |
1da177e4 | 827 | out: |
e40b34c7 | 828 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
829 | |
830 | return err; | |
831 | } | |
832 | ||
833 | static int vfat_unlink(struct inode *dir, struct dentry *dentry) | |
834 | { | |
2b0143b5 | 835 | struct inode *inode = d_inode(dentry); |
8f593427 | 836 | struct super_block *sb = dir->i_sb; |
1da177e4 LT |
837 | struct fat_slot_info sinfo; |
838 | int err; | |
839 | ||
e40b34c7 | 840 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
841 | |
842 | err = vfat_find(dir, &dentry->d_name, &sinfo); | |
843 | if (err) | |
844 | goto out; | |
845 | ||
846 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
847 | if (err) | |
848 | goto out; | |
ce71ec36 | 849 | clear_nlink(inode); |
1da177e4 LT |
850 | inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC; |
851 | fat_detach(inode); | |
1ead0e79 | 852 | dentry->d_time = dir->i_version; |
1da177e4 | 853 | out: |
e40b34c7 | 854 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
855 | |
856 | return err; | |
857 | } | |
858 | ||
18bb1db3 | 859 | static int vfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
860 | { |
861 | struct super_block *sb = dir->i_sb; | |
862 | struct inode *inode; | |
863 | struct fat_slot_info sinfo; | |
864 | struct timespec ts; | |
865 | int err, cluster; | |
866 | ||
e40b34c7 | 867 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
868 | |
869 | ts = CURRENT_TIME_SEC; | |
870 | cluster = fat_alloc_new_dir(dir, &ts); | |
871 | if (cluster < 0) { | |
872 | err = cluster; | |
873 | goto out; | |
874 | } | |
875 | err = vfat_add_entry(dir, &dentry->d_name, 1, cluster, &ts, &sinfo); | |
876 | if (err) | |
877 | goto out_free; | |
878 | dir->i_version++; | |
d8c76e6f | 879 | inc_nlink(dir); |
1da177e4 LT |
880 | |
881 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
882 | brelse(sinfo.bh); | |
883 | if (IS_ERR(inode)) { | |
884 | err = PTR_ERR(inode); | |
885 | /* the directory was completed, just return a error */ | |
886 | goto out; | |
887 | } | |
888 | inode->i_version++; | |
bfe86848 | 889 | set_nlink(inode, 2); |
1da177e4 LT |
890 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; |
891 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
892 | ||
1da177e4 LT |
893 | d_instantiate(dentry, inode); |
894 | ||
e40b34c7 | 895 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
896 | return 0; |
897 | ||
898 | out_free: | |
899 | fat_free_clusters(dir, cluster); | |
900 | out: | |
e40b34c7 | 901 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
902 | return err; |
903 | } | |
904 | ||
905 | static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry, | |
906 | struct inode *new_dir, struct dentry *new_dentry) | |
907 | { | |
908 | struct buffer_head *dotdot_bh; | |
909 | struct msdos_dir_entry *dotdot_de; | |
1da177e4 LT |
910 | struct inode *old_inode, *new_inode; |
911 | struct fat_slot_info old_sinfo, sinfo; | |
912 | struct timespec ts; | |
7669e8fb | 913 | loff_t new_i_pos; |
1da177e4 | 914 | int err, is_dir, update_dotdot, corrupt = 0; |
8f593427 | 915 | struct super_block *sb = old_dir->i_sb; |
1da177e4 LT |
916 | |
917 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; | |
2b0143b5 DH |
918 | old_inode = d_inode(old_dentry); |
919 | new_inode = d_inode(new_dentry); | |
e40b34c7 | 920 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
921 | err = vfat_find(old_dir, &old_dentry->d_name, &old_sinfo); |
922 | if (err) | |
923 | goto out; | |
924 | ||
925 | is_dir = S_ISDIR(old_inode->i_mode); | |
926 | update_dotdot = (is_dir && old_dir != new_dir); | |
927 | if (update_dotdot) { | |
7669e8fb | 928 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) { |
1da177e4 LT |
929 | err = -EIO; |
930 | goto out; | |
931 | } | |
932 | } | |
933 | ||
934 | ts = CURRENT_TIME_SEC; | |
935 | if (new_inode) { | |
1da177e4 LT |
936 | if (is_dir) { |
937 | err = fat_dir_empty(new_inode); | |
938 | if (err) | |
939 | goto out; | |
940 | } | |
9131dd42 | 941 | new_i_pos = MSDOS_I(new_inode)->i_pos; |
1da177e4 LT |
942 | fat_detach(new_inode); |
943 | } else { | |
944 | err = vfat_add_entry(new_dir, &new_dentry->d_name, is_dir, 0, | |
945 | &ts, &sinfo); | |
946 | if (err) | |
947 | goto out; | |
9131dd42 | 948 | new_i_pos = sinfo.i_pos; |
1da177e4 LT |
949 | } |
950 | new_dir->i_version++; | |
951 | ||
952 | fat_detach(old_inode); | |
9131dd42 | 953 | fat_attach(old_inode, new_i_pos); |
1da177e4 LT |
954 | if (IS_DIRSYNC(new_dir)) { |
955 | err = fat_sync_inode(old_inode); | |
956 | if (err) | |
957 | goto error_inode; | |
958 | } else | |
959 | mark_inode_dirty(old_inode); | |
960 | ||
961 | if (update_dotdot) { | |
a943ed71 | 962 | fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart); |
b522412a | 963 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
1da177e4 LT |
964 | if (IS_DIRSYNC(new_dir)) { |
965 | err = sync_dirty_buffer(dotdot_bh); | |
966 | if (err) | |
967 | goto error_dotdot; | |
968 | } | |
9a53c3a7 | 969 | drop_nlink(old_dir); |
1da177e4 | 970 | if (!new_inode) |
d8c76e6f | 971 | inc_nlink(new_dir); |
1da177e4 LT |
972 | } |
973 | ||
974 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ | |
975 | old_sinfo.bh = NULL; | |
976 | if (err) | |
977 | goto error_dotdot; | |
978 | old_dir->i_version++; | |
979 | old_dir->i_ctime = old_dir->i_mtime = ts; | |
980 | if (IS_DIRSYNC(old_dir)) | |
981 | (void)fat_sync_inode(old_dir); | |
982 | else | |
983 | mark_inode_dirty(old_dir); | |
984 | ||
985 | if (new_inode) { | |
9a53c3a7 | 986 | drop_nlink(new_inode); |
1da177e4 | 987 | if (is_dir) |
9a53c3a7 | 988 | drop_nlink(new_inode); |
1da177e4 LT |
989 | new_inode->i_ctime = ts; |
990 | } | |
991 | out: | |
992 | brelse(sinfo.bh); | |
993 | brelse(dotdot_bh); | |
994 | brelse(old_sinfo.bh); | |
e40b34c7 | 995 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
996 | |
997 | return err; | |
998 | ||
999 | error_dotdot: | |
1000 | /* data cluster is shared, serious corruption */ | |
1001 | corrupt = 1; | |
1002 | ||
1003 | if (update_dotdot) { | |
a943ed71 | 1004 | fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart); |
b522412a | 1005 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
1da177e4 LT |
1006 | corrupt |= sync_dirty_buffer(dotdot_bh); |
1007 | } | |
1008 | error_inode: | |
1009 | fat_detach(old_inode); | |
1010 | fat_attach(old_inode, old_sinfo.i_pos); | |
1011 | if (new_inode) { | |
9131dd42 | 1012 | fat_attach(new_inode, new_i_pos); |
1da177e4 LT |
1013 | if (corrupt) |
1014 | corrupt |= fat_sync_inode(new_inode); | |
1015 | } else { | |
1016 | /* | |
1017 | * If new entry was not sharing the data cluster, it | |
1018 | * shouldn't be serious corruption. | |
1019 | */ | |
1020 | int err2 = fat_remove_entries(new_dir, &sinfo); | |
1021 | if (corrupt) | |
1022 | corrupt |= err2; | |
1023 | sinfo.bh = NULL; | |
1024 | } | |
1025 | if (corrupt < 0) { | |
85c78591 | 1026 | fat_fs_error(new_dir->i_sb, |
1da177e4 | 1027 | "%s: Filesystem corrupted (i_pos %lld)", |
8e24eea7 | 1028 | __func__, sinfo.i_pos); |
1da177e4 LT |
1029 | } |
1030 | goto out; | |
1031 | } | |
1032 | ||
c5ef1c42 | 1033 | static const struct inode_operations vfat_dir_inode_operations = { |
1da177e4 LT |
1034 | .create = vfat_create, |
1035 | .lookup = vfat_lookup, | |
1036 | .unlink = vfat_unlink, | |
1037 | .mkdir = vfat_mkdir, | |
1038 | .rmdir = vfat_rmdir, | |
1039 | .rename = vfat_rename, | |
1278fdd3 | 1040 | .setattr = fat_setattr, |
da63fc7c | 1041 | .getattr = fat_getattr, |
1da177e4 LT |
1042 | }; |
1043 | ||
3d23985d | 1044 | static void setup(struct super_block *sb) |
1da177e4 | 1045 | { |
384f5c96 | 1046 | MSDOS_SB(sb)->dir_ops = &vfat_dir_inode_operations; |
1da177e4 | 1047 | if (MSDOS_SB(sb)->options.name_check != 's') |
3d23985d | 1048 | sb->s_d_op = &vfat_ci_dentry_ops; |
1da177e4 | 1049 | else |
3d23985d AV |
1050 | sb->s_d_op = &vfat_dentry_ops; |
1051 | } | |
1da177e4 | 1052 | |
3d23985d AV |
1053 | static int vfat_fill_super(struct super_block *sb, void *data, int silent) |
1054 | { | |
384f5c96 | 1055 | return fat_fill_super(sb, data, silent, 1, setup); |
1da177e4 LT |
1056 | } |
1057 | ||
152a0836 | 1058 | static struct dentry *vfat_mount(struct file_system_type *fs_type, |
454e2398 | 1059 | int flags, const char *dev_name, |
152a0836 | 1060 | void *data) |
1da177e4 | 1061 | { |
152a0836 | 1062 | return mount_bdev(fs_type, flags, dev_name, data, vfat_fill_super); |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | static struct file_system_type vfat_fs_type = { | |
1066 | .owner = THIS_MODULE, | |
1067 | .name = "vfat", | |
152a0836 | 1068 | .mount = vfat_mount, |
1da177e4 LT |
1069 | .kill_sb = kill_block_super, |
1070 | .fs_flags = FS_REQUIRES_DEV, | |
1071 | }; | |
7f78e035 | 1072 | MODULE_ALIAS_FS("vfat"); |
1da177e4 LT |
1073 | |
1074 | static int __init init_vfat_fs(void) | |
1075 | { | |
1076 | return register_filesystem(&vfat_fs_type); | |
1077 | } | |
1078 | ||
1079 | static void __exit exit_vfat_fs(void) | |
1080 | { | |
1081 | unregister_filesystem(&vfat_fs_type); | |
1082 | } | |
1083 | ||
1084 | MODULE_LICENSE("GPL"); | |
1085 | MODULE_DESCRIPTION("VFAT filesystem support"); | |
1086 | MODULE_AUTHOR("Gordon Chaffee"); | |
1087 | ||
1088 | module_init(init_vfat_fs) | |
1089 | module_exit(exit_vfat_fs) |