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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/msdos/namei.c | |
3 | * | |
4 | * Written 1992,1993 by Werner Almesberger | |
5 | * Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu> | |
6 | * Rewritten for constant inumbers 1999 by Al Viro | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/time.h> | |
11 | #include <linux/buffer_head.h> | |
12 | #include <linux/msdos_fs.h> | |
13 | #include <linux/smp_lock.h> | |
14 | ||
15 | /* MS-DOS "device special files" */ | |
16 | static const unsigned char *reserved_names[] = { | |
17 | "CON ", "PRN ", "NUL ", "AUX ", | |
18 | "LPT1 ", "LPT2 ", "LPT3 ", "LPT4 ", | |
19 | "COM1 ", "COM2 ", "COM3 ", "COM4 ", | |
20 | NULL | |
21 | }; | |
22 | ||
23 | /* Characters that are undesirable in an MS-DOS file name */ | |
24 | static unsigned char bad_chars[] = "*?<>|\""; | |
25 | static unsigned char bad_if_strict_pc[] = "+=,; "; | |
26 | /* GEMDOS is less restrictive */ | |
27 | static unsigned char bad_if_strict_atari[] = " "; | |
28 | ||
29 | #define bad_if_strict(opts) \ | |
30 | ((opts)->atari ? bad_if_strict_atari : bad_if_strict_pc) | |
31 | ||
32 | /***** Formats an MS-DOS file name. Rejects invalid names. */ | |
33 | static int msdos_format_name(const unsigned char *name, int len, | |
34 | unsigned char *res, struct fat_mount_options *opts) | |
35 | /* | |
36 | * name is the proposed name, len is its length, res is | |
37 | * the resulting name, opts->name_check is either (r)elaxed, | |
38 | * (n)ormal or (s)trict, opts->dotsOK allows dots at the | |
39 | * beginning of name (for hidden files) | |
40 | */ | |
41 | { | |
42 | unsigned char *walk; | |
43 | const unsigned char **reserved; | |
44 | unsigned char c; | |
45 | int space; | |
46 | ||
47 | if (name[0] == '.') { /* dotfile because . and .. already done */ | |
48 | if (opts->dotsOK) { | |
49 | /* Get rid of dot - test for it elsewhere */ | |
50 | name++; | |
51 | len--; | |
52 | } else if (!opts->atari) | |
53 | return -EINVAL; | |
54 | } | |
55 | /* | |
56 | * disallow names that _really_ start with a dot for MS-DOS, | |
57 | * GEMDOS does not care | |
58 | */ | |
59 | space = !opts->atari; | |
60 | c = 0; | |
61 | for (walk = res; len && walk - res < 8; walk++) { | |
62 | c = *name++; | |
63 | len--; | |
64 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | |
65 | return -EINVAL; | |
66 | if (opts->name_check == 's' && strchr(bad_if_strict(opts), c)) | |
67 | return -EINVAL; | |
68 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | |
69 | return -EINVAL; | |
70 | if (c < ' ' || c == ':' || c == '\\') | |
71 | return -EINVAL; | |
72 | /* | |
73 | * 0xE5 is legal as a first character, but we must substitute | |
74 | * 0x05 because 0xE5 marks deleted files. Yes, DOS really | |
75 | * does this. | |
76 | * It seems that Microsoft hacked DOS to support non-US | |
77 | * characters after the 0xE5 character was already in use to | |
78 | * mark deleted files. | |
79 | */ | |
80 | if ((res == walk) && (c == 0xE5)) | |
81 | c = 0x05; | |
82 | if (c == '.') | |
83 | break; | |
84 | space = (c == ' '); | |
85 | *walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c; | |
86 | } | |
87 | if (space) | |
88 | return -EINVAL; | |
89 | if (opts->name_check == 's' && len && c != '.') { | |
90 | c = *name++; | |
91 | len--; | |
92 | if (c != '.') | |
93 | return -EINVAL; | |
94 | } | |
95 | while (c != '.' && len--) | |
96 | c = *name++; | |
97 | if (c == '.') { | |
98 | while (walk - res < 8) | |
99 | *walk++ = ' '; | |
100 | while (len > 0 && walk - res < MSDOS_NAME) { | |
101 | c = *name++; | |
102 | len--; | |
103 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | |
104 | return -EINVAL; | |
105 | if (opts->name_check == 's' && | |
106 | strchr(bad_if_strict(opts), c)) | |
107 | return -EINVAL; | |
108 | if (c < ' ' || c == ':' || c == '\\') | |
109 | return -EINVAL; | |
110 | if (c == '.') { | |
111 | if (opts->name_check == 's') | |
112 | return -EINVAL; | |
113 | break; | |
114 | } | |
115 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | |
116 | return -EINVAL; | |
117 | space = c == ' '; | |
118 | if (!opts->nocase && c >= 'a' && c <= 'z') | |
119 | *walk++ = c - 32; | |
120 | else | |
121 | *walk++ = c; | |
122 | } | |
123 | if (space) | |
124 | return -EINVAL; | |
125 | if (opts->name_check == 's' && len) | |
126 | return -EINVAL; | |
127 | } | |
128 | while (walk - res < MSDOS_NAME) | |
129 | *walk++ = ' '; | |
130 | if (!opts->atari) | |
131 | /* GEMDOS is less stupid and has no reserved names */ | |
132 | for (reserved = reserved_names; *reserved; reserved++) | |
133 | if (!strncmp(res, *reserved, 8)) | |
134 | return -EINVAL; | |
135 | return 0; | |
136 | } | |
137 | ||
138 | /***** Locates a directory entry. Uses unformatted name. */ | |
139 | static int msdos_find(struct inode *dir, const unsigned char *name, int len, | |
140 | struct fat_slot_info *sinfo) | |
141 | { | |
142 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); | |
143 | unsigned char msdos_name[MSDOS_NAME]; | |
144 | int err; | |
145 | ||
146 | err = msdos_format_name(name, len, msdos_name, &sbi->options); | |
147 | if (err) | |
148 | return -ENOENT; | |
149 | ||
150 | err = fat_scan(dir, msdos_name, sinfo); | |
151 | if (!err && sbi->options.dotsOK) { | |
152 | if (name[0] == '.') { | |
153 | if (!(sinfo->de->attr & ATTR_HIDDEN)) | |
154 | err = -ENOENT; | |
155 | } else { | |
156 | if (sinfo->de->attr & ATTR_HIDDEN) | |
157 | err = -ENOENT; | |
158 | } | |
159 | if (err) | |
160 | brelse(sinfo->bh); | |
161 | } | |
162 | return err; | |
163 | } | |
164 | ||
165 | /* | |
166 | * Compute the hash for the msdos name corresponding to the dentry. | |
167 | * Note: if the name is invalid, we leave the hash code unchanged so | |
168 | * that the existing dentry can be used. The msdos fs routines will | |
169 | * return ENOENT or EINVAL as appropriate. | |
170 | */ | |
171 | static int msdos_hash(struct dentry *dentry, struct qstr *qstr) | |
172 | { | |
173 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; | |
174 | unsigned char msdos_name[MSDOS_NAME]; | |
175 | int error; | |
176 | ||
177 | error = msdos_format_name(qstr->name, qstr->len, msdos_name, options); | |
178 | if (!error) | |
179 | qstr->hash = full_name_hash(msdos_name, MSDOS_NAME); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /* | |
184 | * Compare two msdos names. If either of the names are invalid, | |
185 | * we fall back to doing the standard name comparison. | |
186 | */ | |
187 | static int msdos_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b) | |
188 | { | |
189 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; | |
190 | unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME]; | |
191 | int error; | |
192 | ||
193 | error = msdos_format_name(a->name, a->len, a_msdos_name, options); | |
194 | if (error) | |
195 | goto old_compare; | |
196 | error = msdos_format_name(b->name, b->len, b_msdos_name, options); | |
197 | if (error) | |
198 | goto old_compare; | |
199 | error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME); | |
200 | out: | |
201 | return error; | |
202 | ||
203 | old_compare: | |
204 | error = 1; | |
205 | if (a->len == b->len) | |
206 | error = memcmp(a->name, b->name, a->len); | |
207 | goto out; | |
208 | } | |
209 | ||
210 | static struct dentry_operations msdos_dentry_operations = { | |
211 | .d_hash = msdos_hash, | |
212 | .d_compare = msdos_cmp, | |
213 | }; | |
214 | ||
215 | /* | |
216 | * AV. Wrappers for FAT sb operations. Is it wise? | |
217 | */ | |
218 | ||
219 | /***** Get inode using directory and name */ | |
220 | static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry, | |
221 | struct nameidata *nd) | |
222 | { | |
223 | struct super_block *sb = dir->i_sb; | |
224 | struct fat_slot_info sinfo; | |
225 | struct inode *inode = NULL; | |
226 | int res; | |
227 | ||
228 | dentry->d_op = &msdos_dentry_operations; | |
229 | ||
230 | lock_kernel(); | |
231 | res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | |
232 | if (res == -ENOENT) | |
233 | goto add; | |
234 | if (res < 0) | |
235 | goto out; | |
236 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
237 | brelse(sinfo.bh); | |
238 | if (IS_ERR(inode)) { | |
239 | res = PTR_ERR(inode); | |
240 | goto out; | |
241 | } | |
242 | add: | |
243 | res = 0; | |
244 | dentry = d_splice_alias(inode, dentry); | |
245 | if (dentry) | |
246 | dentry->d_op = &msdos_dentry_operations; | |
247 | out: | |
248 | unlock_kernel(); | |
249 | if (!res) | |
250 | return dentry; | |
251 | return ERR_PTR(res); | |
252 | } | |
253 | ||
254 | /***** Creates a directory entry (name is already formatted). */ | |
255 | static int msdos_add_entry(struct inode *dir, const unsigned char *name, | |
256 | int is_dir, int is_hid, int cluster, | |
257 | struct timespec *ts, struct fat_slot_info *sinfo) | |
258 | { | |
259 | struct msdos_dir_entry de; | |
260 | __le16 time, date; | |
261 | int err; | |
262 | ||
263 | memcpy(de.name, name, MSDOS_NAME); | |
264 | de.attr = is_dir ? ATTR_DIR : ATTR_ARCH; | |
265 | if (is_hid) | |
266 | de.attr |= ATTR_HIDDEN; | |
267 | de.lcase = 0; | |
268 | fat_date_unix2dos(ts->tv_sec, &time, &date); | |
269 | de.cdate = de.adate = 0; | |
270 | de.ctime = 0; | |
271 | de.ctime_cs = 0; | |
272 | de.time = time; | |
273 | de.date = date; | |
274 | de.start = cpu_to_le16(cluster); | |
275 | de.starthi = cpu_to_le16(cluster >> 16); | |
276 | de.size = 0; | |
277 | ||
278 | err = fat_add_entries(dir, &de, 1, sinfo); | |
279 | if (err) | |
280 | return err; | |
281 | ||
282 | dir->i_ctime = dir->i_mtime = *ts; | |
283 | if (IS_DIRSYNC(dir)) | |
284 | (void)fat_sync_inode(dir); | |
285 | else | |
286 | mark_inode_dirty(dir); | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | /***** Create a file */ | |
292 | static int msdos_create(struct inode *dir, struct dentry *dentry, int mode, | |
293 | struct nameidata *nd) | |
294 | { | |
295 | struct super_block *sb = dir->i_sb; | |
296 | struct inode *inode; | |
297 | struct fat_slot_info sinfo; | |
298 | struct timespec ts; | |
299 | unsigned char msdos_name[MSDOS_NAME]; | |
300 | int err, is_hid; | |
301 | ||
302 | lock_kernel(); | |
303 | ||
304 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
305 | msdos_name, &MSDOS_SB(sb)->options); | |
306 | if (err) | |
307 | goto out; | |
308 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
309 | /* Have to do it due to foo vs. .foo conflicts */ | |
310 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
311 | brelse(sinfo.bh); | |
312 | err = -EINVAL; | |
313 | goto out; | |
314 | } | |
315 | ||
316 | ts = CURRENT_TIME_SEC; | |
317 | err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo); | |
318 | if (err) | |
319 | goto out; | |
320 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
321 | brelse(sinfo.bh); | |
322 | if (IS_ERR(inode)) { | |
323 | err = PTR_ERR(inode); | |
324 | goto out; | |
325 | } | |
326 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
327 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
328 | ||
329 | d_instantiate(dentry, inode); | |
330 | out: | |
331 | unlock_kernel(); | |
332 | return err; | |
333 | } | |
334 | ||
335 | /***** Remove a directory */ | |
336 | static int msdos_rmdir(struct inode *dir, struct dentry *dentry) | |
337 | { | |
338 | struct inode *inode = dentry->d_inode; | |
339 | struct fat_slot_info sinfo; | |
340 | int err; | |
341 | ||
342 | lock_kernel(); | |
343 | /* | |
344 | * Check whether the directory is not in use, then check | |
345 | * whether it is empty. | |
346 | */ | |
347 | err = fat_dir_empty(inode); | |
348 | if (err) | |
349 | goto out; | |
350 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | |
351 | if (err) | |
352 | goto out; | |
353 | ||
354 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
355 | if (err) | |
356 | goto out; | |
357 | dir->i_nlink--; | |
358 | ||
359 | inode->i_nlink = 0; | |
360 | inode->i_ctime = CURRENT_TIME_SEC; | |
361 | fat_detach(inode); | |
362 | out: | |
363 | unlock_kernel(); | |
364 | ||
365 | return err; | |
366 | } | |
367 | ||
368 | /***** Make a directory */ | |
369 | static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
370 | { | |
371 | struct super_block *sb = dir->i_sb; | |
372 | struct fat_slot_info sinfo; | |
373 | struct inode *inode; | |
374 | unsigned char msdos_name[MSDOS_NAME]; | |
375 | struct timespec ts; | |
376 | int err, is_hid, cluster; | |
377 | ||
378 | lock_kernel(); | |
379 | ||
380 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
381 | msdos_name, &MSDOS_SB(sb)->options); | |
382 | if (err) | |
383 | goto out; | |
384 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
385 | /* foo vs .foo situation */ | |
386 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
387 | brelse(sinfo.bh); | |
388 | err = -EINVAL; | |
389 | goto out; | |
390 | } | |
391 | ||
392 | ts = CURRENT_TIME_SEC; | |
393 | cluster = fat_alloc_new_dir(dir, &ts); | |
394 | if (cluster < 0) { | |
395 | err = cluster; | |
396 | goto out; | |
397 | } | |
398 | err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo); | |
399 | if (err) | |
400 | goto out_free; | |
401 | dir->i_nlink++; | |
402 | ||
403 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
404 | brelse(sinfo.bh); | |
405 | if (IS_ERR(inode)) { | |
406 | err = PTR_ERR(inode); | |
407 | /* the directory was completed, just return a error */ | |
408 | goto out; | |
409 | } | |
410 | inode->i_nlink = 2; | |
411 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
412 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
413 | ||
414 | d_instantiate(dentry, inode); | |
415 | ||
416 | unlock_kernel(); | |
417 | return 0; | |
418 | ||
419 | out_free: | |
420 | fat_free_clusters(dir, cluster); | |
421 | out: | |
422 | unlock_kernel(); | |
423 | return err; | |
424 | } | |
425 | ||
426 | /***** Unlink a file */ | |
427 | static int msdos_unlink(struct inode *dir, struct dentry *dentry) | |
428 | { | |
429 | struct inode *inode = dentry->d_inode; | |
430 | struct fat_slot_info sinfo; | |
431 | int err; | |
432 | ||
433 | lock_kernel(); | |
434 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | |
435 | if (err) | |
436 | goto out; | |
437 | ||
438 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
439 | if (err) | |
440 | goto out; | |
441 | inode->i_nlink = 0; | |
442 | inode->i_ctime = CURRENT_TIME_SEC; | |
443 | fat_detach(inode); | |
444 | out: | |
445 | unlock_kernel(); | |
446 | ||
447 | return err; | |
448 | } | |
449 | ||
450 | static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name, | |
451 | struct dentry *old_dentry, | |
452 | struct inode *new_dir, unsigned char *new_name, | |
453 | struct dentry *new_dentry, int is_hid) | |
454 | { | |
455 | struct buffer_head *dotdot_bh; | |
456 | struct msdos_dir_entry *dotdot_de; | |
457 | loff_t dotdot_i_pos; | |
458 | struct inode *old_inode, *new_inode; | |
459 | struct fat_slot_info old_sinfo, sinfo; | |
460 | struct timespec ts; | |
461 | int err, old_attrs, is_dir, update_dotdot, corrupt = 0; | |
462 | ||
463 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; | |
464 | old_inode = old_dentry->d_inode; | |
465 | new_inode = new_dentry->d_inode; | |
466 | ||
467 | err = fat_scan(old_dir, old_name, &old_sinfo); | |
468 | if (err) { | |
469 | err = -EIO; | |
470 | goto out; | |
471 | } | |
472 | ||
473 | is_dir = S_ISDIR(old_inode->i_mode); | |
474 | update_dotdot = (is_dir && old_dir != new_dir); | |
475 | if (update_dotdot) { | |
476 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de, | |
477 | &dotdot_i_pos) < 0) { | |
478 | err = -EIO; | |
479 | goto out; | |
480 | } | |
481 | } | |
482 | ||
483 | old_attrs = MSDOS_I(old_inode)->i_attrs; | |
484 | err = fat_scan(new_dir, new_name, &sinfo); | |
485 | if (!err) { | |
486 | if (!new_inode) { | |
487 | /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */ | |
488 | if (sinfo.de != old_sinfo.de) { | |
489 | err = -EINVAL; | |
490 | goto out; | |
491 | } | |
492 | if (is_hid) | |
493 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
494 | else | |
495 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
496 | if (IS_DIRSYNC(old_dir)) { | |
497 | err = fat_sync_inode(old_inode); | |
498 | if (err) { | |
499 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
500 | goto out; | |
501 | } | |
502 | } else | |
503 | mark_inode_dirty(old_inode); | |
504 | ||
505 | old_dir->i_version++; | |
506 | old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC; | |
507 | if (IS_DIRSYNC(old_dir)) | |
508 | (void)fat_sync_inode(old_dir); | |
509 | else | |
510 | mark_inode_dirty(old_dir); | |
511 | goto out; | |
512 | } | |
513 | } | |
514 | ||
515 | ts = CURRENT_TIME_SEC; | |
516 | if (new_inode) { | |
517 | if (err) | |
518 | goto out; | |
519 | if (MSDOS_I(new_inode)->i_pos != sinfo.i_pos) { | |
520 | /* WTF??? Cry and fail. */ | |
521 | printk(KERN_WARNING "msdos_rename: fs corrupted\n"); | |
522 | goto out; | |
523 | } | |
524 | ||
525 | if (is_dir) { | |
526 | err = fat_dir_empty(new_inode); | |
527 | if (err) | |
528 | goto out; | |
529 | } | |
530 | fat_detach(new_inode); | |
531 | } else { | |
532 | err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0, | |
533 | &ts, &sinfo); | |
534 | if (err) | |
535 | goto out; | |
536 | } | |
537 | new_dir->i_version++; | |
538 | ||
539 | fat_detach(old_inode); | |
540 | fat_attach(old_inode, sinfo.i_pos); | |
541 | if (is_hid) | |
542 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
543 | else | |
544 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
545 | if (IS_DIRSYNC(new_dir)) { | |
546 | err = fat_sync_inode(old_inode); | |
547 | if (err) | |
548 | goto error_inode; | |
549 | } else | |
550 | mark_inode_dirty(old_inode); | |
551 | ||
552 | if (update_dotdot) { | |
553 | int start = MSDOS_I(new_dir)->i_logstart; | |
554 | dotdot_de->start = cpu_to_le16(start); | |
555 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
556 | mark_buffer_dirty(dotdot_bh); | |
557 | if (IS_DIRSYNC(new_dir)) { | |
558 | err = sync_dirty_buffer(dotdot_bh); | |
559 | if (err) | |
560 | goto error_dotdot; | |
561 | } | |
562 | old_dir->i_nlink--; | |
563 | if (!new_inode) | |
564 | new_dir->i_nlink++; | |
565 | } | |
566 | ||
567 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ | |
568 | old_sinfo.bh = NULL; | |
569 | if (err) | |
570 | goto error_dotdot; | |
571 | old_dir->i_version++; | |
572 | old_dir->i_ctime = old_dir->i_mtime = ts; | |
573 | if (IS_DIRSYNC(old_dir)) | |
574 | (void)fat_sync_inode(old_dir); | |
575 | else | |
576 | mark_inode_dirty(old_dir); | |
577 | ||
578 | if (new_inode) { | |
579 | if (is_dir) | |
580 | new_inode->i_nlink -= 2; | |
581 | else | |
582 | new_inode->i_nlink--; | |
583 | new_inode->i_ctime = ts; | |
584 | } | |
585 | out: | |
586 | brelse(sinfo.bh); | |
587 | brelse(dotdot_bh); | |
588 | brelse(old_sinfo.bh); | |
589 | return err; | |
590 | ||
591 | error_dotdot: | |
592 | /* data cluster is shared, serious corruption */ | |
593 | corrupt = 1; | |
594 | ||
595 | if (update_dotdot) { | |
596 | int start = MSDOS_I(old_dir)->i_logstart; | |
597 | dotdot_de->start = cpu_to_le16(start); | |
598 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
599 | mark_buffer_dirty(dotdot_bh); | |
600 | corrupt |= sync_dirty_buffer(dotdot_bh); | |
601 | } | |
602 | error_inode: | |
603 | fat_detach(old_inode); | |
604 | fat_attach(old_inode, old_sinfo.i_pos); | |
605 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
606 | if (new_inode) { | |
607 | fat_attach(new_inode, sinfo.i_pos); | |
608 | if (corrupt) | |
609 | corrupt |= fat_sync_inode(new_inode); | |
610 | } else { | |
611 | /* | |
612 | * If new entry was not sharing the data cluster, it | |
613 | * shouldn't be serious corruption. | |
614 | */ | |
615 | int err2 = fat_remove_entries(new_dir, &sinfo); | |
616 | if (corrupt) | |
617 | corrupt |= err2; | |
618 | sinfo.bh = NULL; | |
619 | } | |
620 | if (corrupt < 0) { | |
621 | fat_fs_panic(new_dir->i_sb, | |
622 | "%s: Filesystem corrupted (i_pos %lld)", | |
623 | __FUNCTION__, sinfo.i_pos); | |
624 | } | |
625 | goto out; | |
626 | } | |
627 | ||
628 | /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */ | |
629 | static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry, | |
630 | struct inode *new_dir, struct dentry *new_dentry) | |
631 | { | |
632 | unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME]; | |
633 | int err, is_hid; | |
634 | ||
635 | lock_kernel(); | |
636 | ||
637 | err = msdos_format_name(old_dentry->d_name.name, | |
638 | old_dentry->d_name.len, old_msdos_name, | |
639 | &MSDOS_SB(old_dir->i_sb)->options); | |
640 | if (err) | |
641 | goto out; | |
642 | err = msdos_format_name(new_dentry->d_name.name, | |
643 | new_dentry->d_name.len, new_msdos_name, | |
644 | &MSDOS_SB(new_dir->i_sb)->options); | |
645 | if (err) | |
646 | goto out; | |
647 | ||
648 | is_hid = | |
649 | (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.'); | |
650 | ||
651 | err = do_msdos_rename(old_dir, old_msdos_name, old_dentry, | |
652 | new_dir, new_msdos_name, new_dentry, is_hid); | |
653 | out: | |
654 | unlock_kernel(); | |
655 | return err; | |
656 | } | |
657 | ||
658 | static struct inode_operations msdos_dir_inode_operations = { | |
659 | .create = msdos_create, | |
660 | .lookup = msdos_lookup, | |
661 | .unlink = msdos_unlink, | |
662 | .mkdir = msdos_mkdir, | |
663 | .rmdir = msdos_rmdir, | |
664 | .rename = msdos_rename, | |
665 | .setattr = fat_notify_change, | |
666 | }; | |
667 | ||
668 | static int msdos_fill_super(struct super_block *sb, void *data, int silent) | |
669 | { | |
670 | int res; | |
671 | ||
672 | res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0); | |
673 | if (res) | |
674 | return res; | |
675 | ||
676 | sb->s_flags |= MS_NOATIME; | |
677 | sb->s_root->d_op = &msdos_dentry_operations; | |
678 | return 0; | |
679 | } | |
680 | ||
681 | static struct super_block *msdos_get_sb(struct file_system_type *fs_type, | |
682 | int flags, const char *dev_name, | |
683 | void *data) | |
684 | { | |
685 | return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super); | |
686 | } | |
687 | ||
688 | static struct file_system_type msdos_fs_type = { | |
689 | .owner = THIS_MODULE, | |
690 | .name = "msdos", | |
691 | .get_sb = msdos_get_sb, | |
692 | .kill_sb = kill_block_super, | |
693 | .fs_flags = FS_REQUIRES_DEV, | |
694 | }; | |
695 | ||
696 | static int __init init_msdos_fs(void) | |
697 | { | |
698 | return register_filesystem(&msdos_fs_type); | |
699 | } | |
700 | ||
701 | static void __exit exit_msdos_fs(void) | |
702 | { | |
703 | unregister_filesystem(&msdos_fs_type); | |
704 | } | |
705 | ||
706 | MODULE_LICENSE("GPL"); | |
707 | MODULE_AUTHOR("Werner Almesberger"); | |
708 | MODULE_DESCRIPTION("MS-DOS filesystem support"); | |
709 | ||
710 | module_init(init_msdos_fs) | |
711 | module_exit(exit_msdos_fs) |