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 | 19 | #include <linux/jiffies.h> |
1da177e4 LT |
20 | #include <linux/ctype.h> |
21 | #include <linux/slab.h> | |
1da177e4 LT |
22 | #include <linux/buffer_head.h> |
23 | #include <linux/namei.h> | |
9e975dae | 24 | #include "fat.h" |
1da177e4 | 25 | |
1b524672 OH |
26 | /* |
27 | * If new entry was created in the parent, it could create the 8.3 | |
28 | * alias (the shortname of logname). So, the parent may have the | |
29 | * negative-dentry which matches the created 8.3 alias. | |
30 | * | |
31 | * If it happened, the negative dentry isn't actually negative | |
32 | * anymore. So, drop it. | |
33 | */ | |
34 | static int vfat_revalidate_shortname(struct dentry *dentry) | |
1da177e4 LT |
35 | { |
36 | int ret = 1; | |
1b524672 OH |
37 | spin_lock(&dentry->d_lock); |
38 | if (dentry->d_time != dentry->d_parent->d_inode->i_version) | |
1da177e4 | 39 | ret = 0; |
1b524672 | 40 | spin_unlock(&dentry->d_lock); |
1da177e4 LT |
41 | return ret; |
42 | } | |
43 | ||
1b524672 OH |
44 | static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd) |
45 | { | |
34286d66 NP |
46 | if (nd->flags & LOOKUP_RCU) |
47 | return -ECHILD; | |
48 | ||
1b524672 OH |
49 | /* This is not negative dentry. Always valid. */ |
50 | if (dentry->d_inode) | |
51 | return 1; | |
52 | return vfat_revalidate_shortname(dentry); | |
53 | } | |
54 | ||
55 | static int vfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd) | |
56 | { | |
34286d66 NP |
57 | if (nd->flags & LOOKUP_RCU) |
58 | return -ECHILD; | |
59 | ||
1b524672 OH |
60 | /* |
61 | * This is not negative dentry. Always valid. | |
62 | * | |
63 | * Note, rename() to existing directory entry will have ->d_inode, | |
64 | * and will use existing name which isn't specified name by user. | |
65 | * | |
66 | * We may be able to drop this positive dentry here. But dropping | |
67 | * positive dentry isn't good idea. So it's unsupported like | |
68 | * rename("filename", "FILENAME") for now. | |
69 | */ | |
70 | if (dentry->d_inode) | |
71 | return 1; | |
72 | ||
73 | /* | |
74 | * This may be nfsd (or something), anyway, we can't see the | |
75 | * intent of this. So, since this can be for creation, drop it. | |
76 | */ | |
77 | if (!nd) | |
78 | return 0; | |
79 | ||
80 | /* | |
81 | * Drop the negative dentry, in order to make sure to use the | |
82 | * case sensitive name which is specified by user if this is | |
83 | * for creation. | |
84 | */ | |
85 | if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) { | |
ebeb0406 | 86 | if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
1b524672 OH |
87 | return 0; |
88 | } | |
89 | ||
90 | return vfat_revalidate_shortname(dentry); | |
91 | } | |
92 | ||
1da177e4 | 93 | /* returns the length of a struct qstr, ignoring trailing dots */ |
621e155a | 94 | static unsigned int __vfat_striptail_len(unsigned int len, const char *name) |
1da177e4 | 95 | { |
621e155a | 96 | while (len && name[len - 1] == '.') |
1da177e4 LT |
97 | len--; |
98 | return len; | |
99 | } | |
100 | ||
621e155a NP |
101 | static unsigned int vfat_striptail_len(const struct qstr *qstr) |
102 | { | |
103 | return __vfat_striptail_len(qstr->len, qstr->name); | |
104 | } | |
105 | ||
1da177e4 LT |
106 | /* |
107 | * Compute the hash for the vfat name corresponding to the dentry. | |
108 | * Note: if the name is invalid, we leave the hash code unchanged so | |
109 | * that the existing dentry can be used. The vfat fs routines will | |
110 | * return ENOENT or EINVAL as appropriate. | |
111 | */ | |
b1e6a015 NP |
112 | static int vfat_hash(const struct dentry *dentry, const struct inode *inode, |
113 | struct qstr *qstr) | |
1da177e4 LT |
114 | { |
115 | qstr->hash = full_name_hash(qstr->name, vfat_striptail_len(qstr)); | |
116 | return 0; | |
117 | } | |
118 | ||
119 | /* | |
120 | * Compute the hash for the vfat name corresponding to the dentry. | |
121 | * Note: if the name is invalid, we leave the hash code unchanged so | |
122 | * that the existing dentry can be used. The vfat fs routines will | |
123 | * return ENOENT or EINVAL as appropriate. | |
124 | */ | |
b1e6a015 NP |
125 | static int vfat_hashi(const struct dentry *dentry, const struct inode *inode, |
126 | struct qstr *qstr) | |
1da177e4 | 127 | { |
b1e6a015 | 128 | struct nls_table *t = MSDOS_SB(dentry->d_sb)->nls_io; |
1da177e4 LT |
129 | const unsigned char *name; |
130 | unsigned int len; | |
131 | unsigned long hash; | |
132 | ||
133 | name = qstr->name; | |
134 | len = vfat_striptail_len(qstr); | |
135 | ||
136 | hash = init_name_hash(); | |
137 | while (len--) | |
138 | hash = partial_name_hash(nls_tolower(t, *name++), hash); | |
139 | qstr->hash = end_name_hash(hash); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | /* | |
145 | * Case insensitive compare of two vfat names. | |
146 | */ | |
621e155a NP |
147 | static int vfat_cmpi(const struct dentry *parent, const struct inode *pinode, |
148 | const struct dentry *dentry, const struct inode *inode, | |
149 | unsigned int len, const char *str, const struct qstr *name) | |
1da177e4 | 150 | { |
621e155a | 151 | struct nls_table *t = MSDOS_SB(parent->d_sb)->nls_io; |
1da177e4 LT |
152 | unsigned int alen, blen; |
153 | ||
154 | /* A filename cannot end in '.' or we treat it like it has none */ | |
621e155a NP |
155 | alen = vfat_striptail_len(name); |
156 | blen = __vfat_striptail_len(len, str); | |
1da177e4 | 157 | if (alen == blen) { |
621e155a | 158 | if (nls_strnicmp(t, name->name, str, alen) == 0) |
1da177e4 LT |
159 | return 0; |
160 | } | |
161 | return 1; | |
162 | } | |
163 | ||
164 | /* | |
165 | * Case sensitive compare of two vfat names. | |
166 | */ | |
621e155a NP |
167 | static int vfat_cmp(const struct dentry *parent, const struct inode *pinode, |
168 | const struct dentry *dentry, const struct inode *inode, | |
169 | unsigned int len, const char *str, const struct qstr *name) | |
1da177e4 LT |
170 | { |
171 | unsigned int alen, blen; | |
172 | ||
173 | /* A filename cannot end in '.' or we treat it like it has none */ | |
621e155a NP |
174 | alen = vfat_striptail_len(name); |
175 | blen = __vfat_striptail_len(len, str); | |
1da177e4 | 176 | if (alen == blen) { |
621e155a | 177 | if (strncmp(name->name, str, alen) == 0) |
1da177e4 LT |
178 | return 0; |
179 | } | |
180 | return 1; | |
181 | } | |
182 | ||
ce6cdc47 | 183 | static const struct dentry_operations vfat_ci_dentry_ops = { |
1b524672 OH |
184 | .d_revalidate = vfat_revalidate_ci, |
185 | .d_hash = vfat_hashi, | |
186 | .d_compare = vfat_cmpi, | |
187 | }; | |
188 | ||
ce6cdc47 | 189 | static const struct dentry_operations vfat_dentry_ops = { |
1b524672 OH |
190 | .d_revalidate = vfat_revalidate, |
191 | .d_hash = vfat_hash, | |
192 | .d_compare = vfat_cmp, | |
1da177e4 LT |
193 | }; |
194 | ||
195 | /* Characters that are undesirable in an MS-DOS file name */ | |
196 | ||
197 | static inline wchar_t vfat_bad_char(wchar_t w) | |
198 | { | |
199 | return (w < 0x0020) | |
200 | || (w == '*') || (w == '?') || (w == '<') || (w == '>') | |
201 | || (w == '|') || (w == '"') || (w == ':') || (w == '/') | |
202 | || (w == '\\'); | |
203 | } | |
204 | ||
205 | static inline wchar_t vfat_replace_char(wchar_t w) | |
206 | { | |
207 | return (w == '[') || (w == ']') || (w == ';') || (w == ',') | |
208 | || (w == '+') || (w == '='); | |
209 | } | |
210 | ||
211 | static wchar_t vfat_skip_char(wchar_t w) | |
212 | { | |
213 | return (w == '.') || (w == ' '); | |
214 | } | |
215 | ||
216 | static inline int vfat_is_used_badchars(const wchar_t *s, int len) | |
217 | { | |
218 | int i; | |
219 | ||
220 | for (i = 0; i < len; i++) | |
221 | if (vfat_bad_char(s[i])) | |
222 | return -EINVAL; | |
1da177e4 | 223 | |
f22032ba | 224 | if (s[i - 1] == ' ') /* last character cannot be space */ |
1da177e4 | 225 | return -EINVAL; |
f22032ba | 226 | |
1da177e4 LT |
227 | return 0; |
228 | } | |
229 | ||
230 | static int vfat_find_form(struct inode *dir, unsigned char *name) | |
231 | { | |
232 | struct fat_slot_info sinfo; | |
233 | int err = fat_scan(dir, name, &sinfo); | |
234 | if (err) | |
235 | return -ENOENT; | |
236 | brelse(sinfo.bh); | |
237 | return 0; | |
238 | } | |
239 | ||
240 | /* | |
241 | * 1) Valid characters for the 8.3 format alias are any combination of | |
242 | * letters, uppercase alphabets, digits, any of the | |
243 | * following special characters: | |
244 | * $ % ' ` - @ { } ~ ! # ( ) & _ ^ | |
245 | * In this case Longfilename is not stored in disk. | |
246 | * | |
247 | * WinNT's Extension: | |
248 | * File name and extension name is contain uppercase/lowercase | |
249 | * only. And it is expressed by CASE_LOWER_BASE and CASE_LOWER_EXT. | |
250 | * | |
251 | * 2) File name is 8.3 format, but it contain the uppercase and | |
252 | * lowercase char, muliti bytes char, etc. In this case numtail is not | |
253 | * added, but Longfilename is stored. | |
254 | * | |
255 | * 3) When the one except for the above, or the following special | |
256 | * character are contained: | |
257 | * . [ ] ; , + = | |
258 | * numtail is added, and Longfilename must be stored in disk . | |
259 | */ | |
260 | struct shortname_info { | |
261 | unsigned char lower:1, | |
262 | upper:1, | |
263 | valid:1; | |
264 | }; | |
265 | #define INIT_SHORTNAME_INFO(x) do { \ | |
266 | (x)->lower = 1; \ | |
267 | (x)->upper = 1; \ | |
268 | (x)->valid = 1; \ | |
269 | } while (0) | |
270 | ||
271 | static inline int to_shortname_char(struct nls_table *nls, | |
272 | unsigned char *buf, int buf_size, | |
273 | wchar_t *src, struct shortname_info *info) | |
274 | { | |
275 | int len; | |
276 | ||
277 | if (vfat_skip_char(*src)) { | |
278 | info->valid = 0; | |
279 | return 0; | |
280 | } | |
281 | if (vfat_replace_char(*src)) { | |
282 | info->valid = 0; | |
283 | buf[0] = '_'; | |
284 | return 1; | |
285 | } | |
286 | ||
287 | len = nls->uni2char(*src, buf, buf_size); | |
288 | if (len <= 0) { | |
289 | info->valid = 0; | |
290 | buf[0] = '_'; | |
291 | len = 1; | |
292 | } else if (len == 1) { | |
293 | unsigned char prev = buf[0]; | |
294 | ||
295 | if (buf[0] >= 0x7F) { | |
296 | info->lower = 0; | |
297 | info->upper = 0; | |
298 | } | |
299 | ||
300 | buf[0] = nls_toupper(nls, buf[0]); | |
301 | if (isalpha(buf[0])) { | |
302 | if (buf[0] == prev) | |
303 | info->lower = 0; | |
304 | else | |
305 | info->upper = 0; | |
306 | } | |
307 | } else { | |
308 | info->lower = 0; | |
309 | info->upper = 0; | |
310 | } | |
311 | ||
312 | return len; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Given a valid longname, create a unique shortname. Make sure the | |
317 | * shortname does not exist | |
318 | * Returns negative number on error, 0 for a normal | |
319 | * return, and 1 for valid shortname | |
320 | */ | |
321 | static int vfat_create_shortname(struct inode *dir, struct nls_table *nls, | |
322 | wchar_t *uname, int ulen, | |
323 | unsigned char *name_res, unsigned char *lcase) | |
324 | { | |
325 | struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options; | |
326 | wchar_t *ip, *ext_start, *end, *name_start; | |
30d1872d | 327 | unsigned char base[9], ext[4], buf[5], *p; |
1da177e4 LT |
328 | unsigned char charbuf[NLS_MAX_CHARSET_SIZE]; |
329 | int chl, chi; | |
330 | int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen; | |
331 | int is_shortname; | |
332 | struct shortname_info base_info, ext_info; | |
333 | ||
334 | is_shortname = 1; | |
335 | INIT_SHORTNAME_INFO(&base_info); | |
336 | INIT_SHORTNAME_INFO(&ext_info); | |
337 | ||
338 | /* Now, we need to create a shortname from the long name */ | |
339 | ext_start = end = &uname[ulen]; | |
340 | while (--ext_start >= uname) { | |
341 | if (*ext_start == 0x002E) { /* is `.' */ | |
342 | if (ext_start == end - 1) { | |
343 | sz = ulen; | |
344 | ext_start = NULL; | |
345 | } | |
346 | break; | |
347 | } | |
348 | } | |
349 | ||
350 | if (ext_start == uname - 1) { | |
351 | sz = ulen; | |
352 | ext_start = NULL; | |
353 | } else if (ext_start) { | |
354 | /* | |
355 | * Names which start with a dot could be just | |
356 | * an extension eg. "...test". In this case Win95 | |
357 | * uses the extension as the name and sets no extension. | |
358 | */ | |
359 | name_start = &uname[0]; | |
360 | while (name_start < ext_start) { | |
361 | if (!vfat_skip_char(*name_start)) | |
362 | break; | |
363 | name_start++; | |
364 | } | |
365 | if (name_start != ext_start) { | |
366 | sz = ext_start - uname; | |
367 | ext_start++; | |
368 | } else { | |
369 | sz = ulen; | |
370 | ext_start = NULL; | |
371 | } | |
372 | } | |
373 | ||
374 | numtail_baselen = 6; | |
375 | numtail2_baselen = 2; | |
376 | for (baselen = i = 0, p = base, ip = uname; i < sz; i++, ip++) { | |
377 | chl = to_shortname_char(nls, charbuf, sizeof(charbuf), | |
378 | ip, &base_info); | |
379 | if (chl == 0) | |
380 | continue; | |
381 | ||
382 | if (baselen < 2 && (baselen + chl) > 2) | |
383 | numtail2_baselen = baselen; | |
384 | if (baselen < 6 && (baselen + chl) > 6) | |
385 | numtail_baselen = baselen; | |
386 | for (chi = 0; chi < chl; chi++) { | |
387 | *p++ = charbuf[chi]; | |
388 | baselen++; | |
389 | if (baselen >= 8) | |
390 | break; | |
391 | } | |
392 | if (baselen >= 8) { | |
393 | if ((chi < chl - 1) || (ip + 1) - uname < sz) | |
394 | is_shortname = 0; | |
395 | break; | |
396 | } | |
397 | } | |
398 | if (baselen == 0) { | |
399 | return -EINVAL; | |
400 | } | |
401 | ||
402 | extlen = 0; | |
403 | if (ext_start) { | |
404 | for (p = ext, ip = ext_start; extlen < 3 && ip < end; ip++) { | |
405 | chl = to_shortname_char(nls, charbuf, sizeof(charbuf), | |
406 | ip, &ext_info); | |
407 | if (chl == 0) | |
408 | continue; | |
409 | ||
410 | if ((extlen + chl) > 3) { | |
411 | is_shortname = 0; | |
412 | break; | |
413 | } | |
414 | for (chi = 0; chi < chl; chi++) { | |
415 | *p++ = charbuf[chi]; | |
416 | extlen++; | |
417 | } | |
418 | if (extlen >= 3) { | |
419 | if (ip + 1 != end) | |
420 | is_shortname = 0; | |
421 | break; | |
422 | } | |
423 | } | |
424 | } | |
425 | ext[extlen] = '\0'; | |
426 | base[baselen] = '\0'; | |
427 | ||
428 | /* Yes, it can happen. ".\xe5" would do it. */ | |
429 | if (base[0] == DELETED_FLAG) | |
430 | base[0] = 0x05; | |
431 | ||
432 | /* OK, at this point we know that base is not longer than 8 symbols, | |
433 | * ext is not longer than 3, base is nonempty, both don't contain | |
434 | * any bad symbols (lowercase transformed to uppercase). | |
435 | */ | |
436 | ||
437 | memset(name_res, ' ', MSDOS_NAME); | |
438 | memcpy(name_res, base, baselen); | |
439 | memcpy(name_res + 8, ext, extlen); | |
440 | *lcase = 0; | |
441 | if (is_shortname && base_info.valid && ext_info.valid) { | |
442 | if (vfat_find_form(dir, name_res) == 0) | |
443 | return -EEXIST; | |
444 | ||
445 | if (opts->shortname & VFAT_SFN_CREATE_WIN95) { | |
446 | return (base_info.upper && ext_info.upper); | |
447 | } else if (opts->shortname & VFAT_SFN_CREATE_WINNT) { | |
448 | if ((base_info.upper || base_info.lower) && | |
449 | (ext_info.upper || ext_info.lower)) { | |
450 | if (!base_info.upper && base_info.lower) | |
451 | *lcase |= CASE_LOWER_BASE; | |
452 | if (!ext_info.upper && ext_info.lower) | |
453 | *lcase |= CASE_LOWER_EXT; | |
454 | return 1; | |
455 | } | |
456 | return 0; | |
457 | } else { | |
458 | BUG(); | |
459 | } | |
460 | } | |
461 | ||
462 | if (opts->numtail == 0) | |
463 | if (vfat_find_form(dir, name_res) < 0) | |
464 | return 0; | |
465 | ||
466 | /* | |
467 | * Try to find a unique extension. This used to | |
468 | * iterate through all possibilities sequentially, | |
469 | * but that gave extremely bad performance. Windows | |
470 | * only tries a few cases before using random | |
471 | * values for part of the base. | |
472 | */ | |
473 | ||
474 | if (baselen > 6) { | |
475 | baselen = numtail_baselen; | |
476 | name_res[7] = ' '; | |
477 | } | |
478 | name_res[baselen] = '~'; | |
479 | for (i = 1; i < 10; i++) { | |
480 | name_res[baselen + 1] = i + '0'; | |
481 | if (vfat_find_form(dir, name_res) < 0) | |
482 | return 0; | |
483 | } | |
484 | ||
30d1872d | 485 | i = jiffies; |
1da177e4 LT |
486 | sz = (jiffies >> 16) & 0x7; |
487 | if (baselen > 2) { | |
488 | baselen = numtail2_baselen; | |
489 | name_res[7] = ' '; | |
490 | } | |
491 | name_res[baselen + 4] = '~'; | |
492 | name_res[baselen + 5] = '1' + sz; | |
493 | while (1) { | |
30d1872d | 494 | snprintf(buf, sizeof(buf), "%04X", i & 0xffff); |
1da177e4 LT |
495 | memcpy(&name_res[baselen], buf, 4); |
496 | if (vfat_find_form(dir, name_res) < 0) | |
497 | break; | |
498 | i -= 11; | |
499 | } | |
500 | return 0; | |
501 | } | |
502 | ||
503 | /* Translate a string, including coded sequences into Unicode */ | |
504 | static int | |
505 | xlate_to_uni(const unsigned char *name, int len, unsigned char *outname, | |
506 | int *longlen, int *outlen, int escape, int utf8, | |
507 | struct nls_table *nls) | |
508 | { | |
509 | const unsigned char *ip; | |
510 | unsigned char nc; | |
511 | unsigned char *op; | |
512 | unsigned int ec; | |
513 | int i, k, fill; | |
514 | int charlen; | |
515 | ||
516 | if (utf8) { | |
67638e40 OH |
517 | *outlen = utf8s_to_utf16s(name, len, (wchar_t *)outname); |
518 | if (*outlen < 0) | |
519 | return *outlen; | |
eeb5b4ae | 520 | else if (*outlen > FAT_LFN_LEN) |
f22032ba KM |
521 | return -ENAMETOOLONG; |
522 | ||
1da177e4 LT |
523 | op = &outname[*outlen * sizeof(wchar_t)]; |
524 | } else { | |
525 | if (nls) { | |
526 | for (i = 0, ip = name, op = outname, *outlen = 0; | |
eeb5b4ae | 527 | i < len && *outlen <= FAT_LFN_LEN; |
1da177e4 LT |
528 | *outlen += 1) |
529 | { | |
530 | if (escape && (*ip == ':')) { | |
531 | if (i > len - 5) | |
532 | return -EINVAL; | |
533 | ec = 0; | |
534 | for (k = 1; k < 5; k++) { | |
535 | nc = ip[k]; | |
536 | ec <<= 4; | |
537 | if (nc >= '0' && nc <= '9') { | |
538 | ec |= nc - '0'; | |
539 | continue; | |
540 | } | |
541 | if (nc >= 'a' && nc <= 'f') { | |
542 | ec |= nc - ('a' - 10); | |
543 | continue; | |
544 | } | |
545 | if (nc >= 'A' && nc <= 'F') { | |
546 | ec |= nc - ('A' - 10); | |
547 | continue; | |
548 | } | |
549 | return -EINVAL; | |
550 | } | |
551 | *op++ = ec & 0xFF; | |
552 | *op++ = ec >> 8; | |
553 | ip += 5; | |
554 | i += 5; | |
555 | } else { | |
556 | if ((charlen = nls->char2uni(ip, len - i, (wchar_t *)op)) < 0) | |
557 | return -EINVAL; | |
558 | ip += charlen; | |
559 | i += charlen; | |
560 | op += 2; | |
561 | } | |
562 | } | |
f22032ba KM |
563 | if (i < len) |
564 | return -ENAMETOOLONG; | |
1da177e4 LT |
565 | } else { |
566 | for (i = 0, ip = name, op = outname, *outlen = 0; | |
eeb5b4ae | 567 | i < len && *outlen <= FAT_LFN_LEN; |
1da177e4 LT |
568 | i++, *outlen += 1) |
569 | { | |
570 | *op++ = *ip++; | |
571 | *op++ = 0; | |
572 | } | |
f22032ba KM |
573 | if (i < len) |
574 | return -ENAMETOOLONG; | |
1da177e4 LT |
575 | } |
576 | } | |
1da177e4 LT |
577 | |
578 | *longlen = *outlen; | |
579 | if (*outlen % 13) { | |
580 | *op++ = 0; | |
581 | *op++ = 0; | |
582 | *outlen += 1; | |
583 | if (*outlen % 13) { | |
584 | fill = 13 - (*outlen % 13); | |
585 | for (i = 0; i < fill; i++) { | |
586 | *op++ = 0xff; | |
587 | *op++ = 0xff; | |
588 | } | |
589 | *outlen += fill; | |
590 | } | |
591 | } | |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
596 | static int vfat_build_slots(struct inode *dir, const unsigned char *name, | |
597 | int len, int is_dir, int cluster, | |
598 | struct timespec *ts, | |
599 | struct msdos_dir_slot *slots, int *nr_slots) | |
600 | { | |
601 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); | |
602 | struct fat_mount_options *opts = &sbi->options; | |
603 | struct msdos_dir_slot *ps; | |
604 | struct msdos_dir_entry *de; | |
1da177e4 LT |
605 | unsigned char cksum, lcase; |
606 | unsigned char msdos_name[MSDOS_NAME]; | |
607 | wchar_t *uname; | |
608 | __le16 time, date; | |
7decd1cb | 609 | u8 time_cs; |
1da177e4 LT |
610 | int err, ulen, usize, i; |
611 | loff_t offset; | |
612 | ||
613 | *nr_slots = 0; | |
1da177e4 | 614 | |
c7a6c4ed OH |
615 | uname = __getname(); |
616 | if (!uname) | |
1da177e4 LT |
617 | return -ENOMEM; |
618 | ||
1da177e4 LT |
619 | err = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize, |
620 | opts->unicode_xlate, opts->utf8, sbi->nls_io); | |
621 | if (err) | |
622 | goto out_free; | |
623 | ||
624 | err = vfat_is_used_badchars(uname, ulen); | |
625 | if (err) | |
626 | goto out_free; | |
627 | ||
628 | err = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen, | |
629 | msdos_name, &lcase); | |
630 | if (err < 0) | |
631 | goto out_free; | |
632 | else if (err == 1) { | |
633 | de = (struct msdos_dir_entry *)slots; | |
634 | err = 0; | |
635 | goto shortname; | |
636 | } | |
637 | ||
638 | /* build the entry of long file name */ | |
451cbaa1 | 639 | cksum = fat_checksum(msdos_name); |
1da177e4 LT |
640 | |
641 | *nr_slots = usize / 13; | |
642 | for (ps = slots, i = *nr_slots; i > 0; i--, ps++) { | |
643 | ps->id = i; | |
644 | ps->attr = ATTR_EXT; | |
645 | ps->reserved = 0; | |
646 | ps->alias_checksum = cksum; | |
647 | ps->start = 0; | |
648 | offset = (i - 1) * 13; | |
649 | fatwchar_to16(ps->name0_4, uname + offset, 5); | |
650 | fatwchar_to16(ps->name5_10, uname + offset + 5, 6); | |
651 | fatwchar_to16(ps->name11_12, uname + offset + 11, 2); | |
652 | } | |
653 | slots[0].id |= 0x40; | |
654 | de = (struct msdos_dir_entry *)ps; | |
655 | ||
656 | shortname: | |
657 | /* build the entry of 8.3 alias name */ | |
658 | (*nr_slots)++; | |
659 | memcpy(de->name, msdos_name, MSDOS_NAME); | |
660 | de->attr = is_dir ? ATTR_DIR : ATTR_ARCH; | |
661 | de->lcase = lcase; | |
7decd1cb | 662 | fat_time_unix2fat(sbi, ts, &time, &date, &time_cs); |
1da177e4 LT |
663 | de->time = de->ctime = time; |
664 | de->date = de->cdate = de->adate = date; | |
7decd1cb | 665 | de->ctime_cs = time_cs; |
1da177e4 LT |
666 | de->start = cpu_to_le16(cluster); |
667 | de->starthi = cpu_to_le16(cluster >> 16); | |
668 | de->size = 0; | |
669 | out_free: | |
c7a6c4ed | 670 | __putname(uname); |
1da177e4 LT |
671 | return err; |
672 | } | |
673 | ||
674 | static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir, | |
675 | int cluster, struct timespec *ts, | |
676 | struct fat_slot_info *sinfo) | |
677 | { | |
678 | struct msdos_dir_slot *slots; | |
679 | unsigned int len; | |
680 | int err, nr_slots; | |
681 | ||
682 | len = vfat_striptail_len(qname); | |
683 | if (len == 0) | |
684 | return -ENOENT; | |
685 | ||
8f593427 | 686 | slots = kmalloc(sizeof(*slots) * MSDOS_SLOTS, GFP_NOFS); |
1da177e4 LT |
687 | if (slots == NULL) |
688 | return -ENOMEM; | |
689 | ||
690 | err = vfat_build_slots(dir, qname->name, len, is_dir, cluster, ts, | |
691 | slots, &nr_slots); | |
692 | if (err) | |
693 | goto cleanup; | |
694 | ||
695 | err = fat_add_entries(dir, slots, nr_slots, sinfo); | |
696 | if (err) | |
697 | goto cleanup; | |
698 | ||
699 | /* update timestamp */ | |
700 | dir->i_ctime = dir->i_mtime = dir->i_atime = *ts; | |
701 | if (IS_DIRSYNC(dir)) | |
702 | (void)fat_sync_inode(dir); | |
703 | else | |
704 | mark_inode_dirty(dir); | |
705 | cleanup: | |
706 | kfree(slots); | |
707 | return err; | |
708 | } | |
709 | ||
710 | static int vfat_find(struct inode *dir, struct qstr *qname, | |
711 | struct fat_slot_info *sinfo) | |
712 | { | |
713 | unsigned int len = vfat_striptail_len(qname); | |
714 | if (len == 0) | |
715 | return -ENOENT; | |
716 | return fat_search_long(dir, qname->name, len, sinfo); | |
717 | } | |
718 | ||
8045e298 OH |
719 | /* |
720 | * (nfsd's) anonymous disconnected dentry? | |
721 | * NOTE: !IS_ROOT() is not anonymous (I.e. d_splice_alias() did the job). | |
722 | */ | |
723 | static int vfat_d_anon_disconn(struct dentry *dentry) | |
724 | { | |
725 | return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); | |
726 | } | |
727 | ||
1da177e4 LT |
728 | static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry, |
729 | struct nameidata *nd) | |
730 | { | |
731 | struct super_block *sb = dir->i_sb; | |
732 | struct fat_slot_info sinfo; | |
068f5ae0 | 733 | struct inode *inode; |
1da177e4 | 734 | struct dentry *alias; |
1b524672 | 735 | int err; |
1da177e4 | 736 | |
8f593427 | 737 | lock_super(sb); |
1da177e4 LT |
738 | |
739 | err = vfat_find(dir, &dentry->d_name, &sinfo); | |
740 | if (err) { | |
068f5ae0 | 741 | if (err == -ENOENT) { |
068f5ae0 OH |
742 | inode = NULL; |
743 | goto out; | |
744 | } | |
1da177e4 LT |
745 | goto error; |
746 | } | |
1b524672 | 747 | |
1da177e4 LT |
748 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
749 | brelse(sinfo.bh); | |
750 | if (IS_ERR(inode)) { | |
068f5ae0 OH |
751 | err = PTR_ERR(inode); |
752 | goto error; | |
1da177e4 | 753 | } |
1b524672 | 754 | |
1da177e4 | 755 | alias = d_find_alias(inode); |
8045e298 | 756 | if (alias && !vfat_d_anon_disconn(alias)) { |
1b524672 | 757 | /* |
8045e298 OH |
758 | * This inode has non anonymous-DCACHE_DISCONNECTED |
759 | * dentry. This means, the user did ->lookup() by an | |
760 | * another name (longname vs 8.3 alias of it) in past. | |
1b524672 OH |
761 | * |
762 | * Switch to new one for reason of locality if possible. | |
763 | */ | |
1c13a243 OH |
764 | BUG_ON(d_unhashed(alias)); |
765 | if (!S_ISDIR(inode->i_mode)) | |
766 | d_move(alias, dentry); | |
767 | iput(inode); | |
768 | unlock_super(sb); | |
769 | return alias; | |
8045e298 OH |
770 | } else |
771 | dput(alias); | |
772 | ||
068f5ae0 | 773 | out: |
8f593427 | 774 | unlock_super(sb); |
1da177e4 LT |
775 | dentry->d_time = dentry->d_parent->d_inode->i_version; |
776 | dentry = d_splice_alias(inode, dentry); | |
3d23985d | 777 | if (dentry) |
1da177e4 | 778 | dentry->d_time = dentry->d_parent->d_inode->i_version; |
1da177e4 | 779 | return dentry; |
068f5ae0 OH |
780 | |
781 | error: | |
782 | unlock_super(sb); | |
783 | return ERR_PTR(err); | |
1da177e4 LT |
784 | } |
785 | ||
786 | static int vfat_create(struct inode *dir, struct dentry *dentry, int mode, | |
787 | struct nameidata *nd) | |
788 | { | |
789 | struct super_block *sb = dir->i_sb; | |
790 | struct inode *inode; | |
791 | struct fat_slot_info sinfo; | |
792 | struct timespec ts; | |
793 | int err; | |
794 | ||
8f593427 | 795 | lock_super(sb); |
1da177e4 LT |
796 | |
797 | ts = CURRENT_TIME_SEC; | |
798 | err = vfat_add_entry(dir, &dentry->d_name, 0, 0, &ts, &sinfo); | |
799 | if (err) | |
800 | goto out; | |
801 | dir->i_version++; | |
802 | ||
803 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
804 | brelse(sinfo.bh); | |
805 | if (IS_ERR(inode)) { | |
806 | err = PTR_ERR(inode); | |
807 | goto out; | |
808 | } | |
809 | inode->i_version++; | |
810 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
811 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
812 | ||
813 | dentry->d_time = dentry->d_parent->d_inode->i_version; | |
814 | d_instantiate(dentry, inode); | |
815 | out: | |
8f593427 | 816 | unlock_super(sb); |
1da177e4 LT |
817 | return err; |
818 | } | |
819 | ||
820 | static int vfat_rmdir(struct inode *dir, struct dentry *dentry) | |
821 | { | |
822 | struct inode *inode = dentry->d_inode; | |
8f593427 | 823 | struct super_block *sb = dir->i_sb; |
1da177e4 LT |
824 | struct fat_slot_info sinfo; |
825 | int err; | |
826 | ||
8f593427 | 827 | lock_super(sb); |
1da177e4 LT |
828 | |
829 | err = fat_dir_empty(inode); | |
830 | if (err) | |
831 | goto out; | |
832 | err = vfat_find(dir, &dentry->d_name, &sinfo); | |
833 | if (err) | |
834 | goto out; | |
835 | ||
836 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
837 | if (err) | |
838 | goto out; | |
9a53c3a7 | 839 | drop_nlink(dir); |
1da177e4 | 840 | |
ce71ec36 | 841 | clear_nlink(inode); |
1da177e4 LT |
842 | inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC; |
843 | fat_detach(inode); | |
844 | out: | |
8f593427 | 845 | unlock_super(sb); |
1da177e4 LT |
846 | |
847 | return err; | |
848 | } | |
849 | ||
850 | static int vfat_unlink(struct inode *dir, struct dentry *dentry) | |
851 | { | |
852 | struct inode *inode = dentry->d_inode; | |
8f593427 | 853 | struct super_block *sb = dir->i_sb; |
1da177e4 LT |
854 | struct fat_slot_info sinfo; |
855 | int err; | |
856 | ||
8f593427 | 857 | lock_super(sb); |
1da177e4 LT |
858 | |
859 | err = vfat_find(dir, &dentry->d_name, &sinfo); | |
860 | if (err) | |
861 | goto out; | |
862 | ||
863 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
864 | if (err) | |
865 | goto out; | |
ce71ec36 | 866 | clear_nlink(inode); |
1da177e4 LT |
867 | inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC; |
868 | fat_detach(inode); | |
869 | out: | |
8f593427 | 870 | unlock_super(sb); |
1da177e4 LT |
871 | |
872 | return err; | |
873 | } | |
874 | ||
875 | static int vfat_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
876 | { | |
877 | struct super_block *sb = dir->i_sb; | |
878 | struct inode *inode; | |
879 | struct fat_slot_info sinfo; | |
880 | struct timespec ts; | |
881 | int err, cluster; | |
882 | ||
8f593427 | 883 | lock_super(sb); |
1da177e4 LT |
884 | |
885 | ts = CURRENT_TIME_SEC; | |
886 | cluster = fat_alloc_new_dir(dir, &ts); | |
887 | if (cluster < 0) { | |
888 | err = cluster; | |
889 | goto out; | |
890 | } | |
891 | err = vfat_add_entry(dir, &dentry->d_name, 1, cluster, &ts, &sinfo); | |
892 | if (err) | |
893 | goto out_free; | |
894 | dir->i_version++; | |
d8c76e6f | 895 | inc_nlink(dir); |
1da177e4 LT |
896 | |
897 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
898 | brelse(sinfo.bh); | |
899 | if (IS_ERR(inode)) { | |
900 | err = PTR_ERR(inode); | |
901 | /* the directory was completed, just return a error */ | |
902 | goto out; | |
903 | } | |
904 | inode->i_version++; | |
905 | inode->i_nlink = 2; | |
906 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
907 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
908 | ||
909 | dentry->d_time = dentry->d_parent->d_inode->i_version; | |
910 | d_instantiate(dentry, inode); | |
911 | ||
8f593427 | 912 | unlock_super(sb); |
1da177e4 LT |
913 | return 0; |
914 | ||
915 | out_free: | |
916 | fat_free_clusters(dir, cluster); | |
917 | out: | |
8f593427 | 918 | unlock_super(sb); |
1da177e4 LT |
919 | return err; |
920 | } | |
921 | ||
922 | static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry, | |
923 | struct inode *new_dir, struct dentry *new_dentry) | |
924 | { | |
925 | struct buffer_head *dotdot_bh; | |
926 | struct msdos_dir_entry *dotdot_de; | |
1da177e4 LT |
927 | struct inode *old_inode, *new_inode; |
928 | struct fat_slot_info old_sinfo, sinfo; | |
929 | struct timespec ts; | |
9131dd42 | 930 | loff_t dotdot_i_pos, new_i_pos; |
1da177e4 | 931 | int err, is_dir, update_dotdot, corrupt = 0; |
8f593427 | 932 | struct super_block *sb = old_dir->i_sb; |
1da177e4 LT |
933 | |
934 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; | |
935 | old_inode = old_dentry->d_inode; | |
936 | new_inode = new_dentry->d_inode; | |
8f593427 | 937 | lock_super(sb); |
1da177e4 LT |
938 | err = vfat_find(old_dir, &old_dentry->d_name, &old_sinfo); |
939 | if (err) | |
940 | goto out; | |
941 | ||
942 | is_dir = S_ISDIR(old_inode->i_mode); | |
943 | update_dotdot = (is_dir && old_dir != new_dir); | |
944 | if (update_dotdot) { | |
945 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de, | |
946 | &dotdot_i_pos) < 0) { | |
947 | err = -EIO; | |
948 | goto out; | |
949 | } | |
950 | } | |
951 | ||
952 | ts = CURRENT_TIME_SEC; | |
953 | if (new_inode) { | |
1da177e4 LT |
954 | if (is_dir) { |
955 | err = fat_dir_empty(new_inode); | |
956 | if (err) | |
957 | goto out; | |
958 | } | |
9131dd42 | 959 | new_i_pos = MSDOS_I(new_inode)->i_pos; |
1da177e4 LT |
960 | fat_detach(new_inode); |
961 | } else { | |
962 | err = vfat_add_entry(new_dir, &new_dentry->d_name, is_dir, 0, | |
963 | &ts, &sinfo); | |
964 | if (err) | |
965 | goto out; | |
9131dd42 | 966 | new_i_pos = sinfo.i_pos; |
1da177e4 LT |
967 | } |
968 | new_dir->i_version++; | |
969 | ||
970 | fat_detach(old_inode); | |
9131dd42 | 971 | fat_attach(old_inode, new_i_pos); |
1da177e4 LT |
972 | if (IS_DIRSYNC(new_dir)) { |
973 | err = fat_sync_inode(old_inode); | |
974 | if (err) | |
975 | goto error_inode; | |
976 | } else | |
977 | mark_inode_dirty(old_inode); | |
978 | ||
979 | if (update_dotdot) { | |
980 | int start = MSDOS_I(new_dir)->i_logstart; | |
981 | dotdot_de->start = cpu_to_le16(start); | |
982 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
b522412a | 983 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
1da177e4 LT |
984 | if (IS_DIRSYNC(new_dir)) { |
985 | err = sync_dirty_buffer(dotdot_bh); | |
986 | if (err) | |
987 | goto error_dotdot; | |
988 | } | |
9a53c3a7 | 989 | drop_nlink(old_dir); |
1da177e4 | 990 | if (!new_inode) |
d8c76e6f | 991 | inc_nlink(new_dir); |
1da177e4 LT |
992 | } |
993 | ||
994 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ | |
995 | old_sinfo.bh = NULL; | |
996 | if (err) | |
997 | goto error_dotdot; | |
998 | old_dir->i_version++; | |
999 | old_dir->i_ctime = old_dir->i_mtime = ts; | |
1000 | if (IS_DIRSYNC(old_dir)) | |
1001 | (void)fat_sync_inode(old_dir); | |
1002 | else | |
1003 | mark_inode_dirty(old_dir); | |
1004 | ||
1005 | if (new_inode) { | |
9a53c3a7 | 1006 | drop_nlink(new_inode); |
1da177e4 | 1007 | if (is_dir) |
9a53c3a7 | 1008 | drop_nlink(new_inode); |
1da177e4 LT |
1009 | new_inode->i_ctime = ts; |
1010 | } | |
1011 | out: | |
1012 | brelse(sinfo.bh); | |
1013 | brelse(dotdot_bh); | |
1014 | brelse(old_sinfo.bh); | |
8f593427 | 1015 | unlock_super(sb); |
1da177e4 LT |
1016 | |
1017 | return err; | |
1018 | ||
1019 | error_dotdot: | |
1020 | /* data cluster is shared, serious corruption */ | |
1021 | corrupt = 1; | |
1022 | ||
1023 | if (update_dotdot) { | |
1024 | int start = MSDOS_I(old_dir)->i_logstart; | |
1025 | dotdot_de->start = cpu_to_le16(start); | |
1026 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
b522412a | 1027 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
1da177e4 LT |
1028 | corrupt |= sync_dirty_buffer(dotdot_bh); |
1029 | } | |
1030 | error_inode: | |
1031 | fat_detach(old_inode); | |
1032 | fat_attach(old_inode, old_sinfo.i_pos); | |
1033 | if (new_inode) { | |
9131dd42 | 1034 | fat_attach(new_inode, new_i_pos); |
1da177e4 LT |
1035 | if (corrupt) |
1036 | corrupt |= fat_sync_inode(new_inode); | |
1037 | } else { | |
1038 | /* | |
1039 | * If new entry was not sharing the data cluster, it | |
1040 | * shouldn't be serious corruption. | |
1041 | */ | |
1042 | int err2 = fat_remove_entries(new_dir, &sinfo); | |
1043 | if (corrupt) | |
1044 | corrupt |= err2; | |
1045 | sinfo.bh = NULL; | |
1046 | } | |
1047 | if (corrupt < 0) { | |
85c78591 | 1048 | fat_fs_error(new_dir->i_sb, |
1da177e4 | 1049 | "%s: Filesystem corrupted (i_pos %lld)", |
8e24eea7 | 1050 | __func__, sinfo.i_pos); |
1da177e4 LT |
1051 | } |
1052 | goto out; | |
1053 | } | |
1054 | ||
c5ef1c42 | 1055 | static const struct inode_operations vfat_dir_inode_operations = { |
1da177e4 LT |
1056 | .create = vfat_create, |
1057 | .lookup = vfat_lookup, | |
1058 | .unlink = vfat_unlink, | |
1059 | .mkdir = vfat_mkdir, | |
1060 | .rmdir = vfat_rmdir, | |
1061 | .rename = vfat_rename, | |
1278fdd3 | 1062 | .setattr = fat_setattr, |
da63fc7c | 1063 | .getattr = fat_getattr, |
1da177e4 LT |
1064 | }; |
1065 | ||
3d23985d | 1066 | static void setup(struct super_block *sb) |
1da177e4 | 1067 | { |
1da177e4 | 1068 | if (MSDOS_SB(sb)->options.name_check != 's') |
3d23985d | 1069 | sb->s_d_op = &vfat_ci_dentry_ops; |
1da177e4 | 1070 | else |
3d23985d AV |
1071 | sb->s_d_op = &vfat_dentry_ops; |
1072 | } | |
1da177e4 | 1073 | |
3d23985d AV |
1074 | static int vfat_fill_super(struct super_block *sb, void *data, int silent) |
1075 | { | |
1076 | return fat_fill_super(sb, data, silent, &vfat_dir_inode_operations, | |
1077 | 1, setup); | |
1da177e4 LT |
1078 | } |
1079 | ||
152a0836 | 1080 | static struct dentry *vfat_mount(struct file_system_type *fs_type, |
454e2398 | 1081 | int flags, const char *dev_name, |
152a0836 | 1082 | void *data) |
1da177e4 | 1083 | { |
152a0836 | 1084 | return mount_bdev(fs_type, flags, dev_name, data, vfat_fill_super); |
1da177e4 LT |
1085 | } |
1086 | ||
1087 | static struct file_system_type vfat_fs_type = { | |
1088 | .owner = THIS_MODULE, | |
1089 | .name = "vfat", | |
152a0836 | 1090 | .mount = vfat_mount, |
1da177e4 LT |
1091 | .kill_sb = kill_block_super, |
1092 | .fs_flags = FS_REQUIRES_DEV, | |
1093 | }; | |
1094 | ||
1095 | static int __init init_vfat_fs(void) | |
1096 | { | |
1097 | return register_filesystem(&vfat_fs_type); | |
1098 | } | |
1099 | ||
1100 | static void __exit exit_vfat_fs(void) | |
1101 | { | |
1102 | unregister_filesystem(&vfat_fs_type); | |
1103 | } | |
1104 | ||
1105 | MODULE_LICENSE("GPL"); | |
1106 | MODULE_DESCRIPTION("VFAT filesystem support"); | |
1107 | MODULE_AUTHOR("Gordon Chaffee"); | |
1108 | ||
1109 | module_init(init_vfat_fs) | |
1110 | module_exit(exit_vfat_fs) |