Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
15 | /* Characters that are undesirable in an MS-DOS file name */ |
16 | static unsigned char bad_chars[] = "*?<>|\""; | |
17 | static unsigned char bad_if_strict_pc[] = "+=,; "; | |
18 | /* GEMDOS is less restrictive */ | |
19 | static unsigned char bad_if_strict_atari[] = " "; | |
20 | ||
21 | #define bad_if_strict(opts) \ | |
22 | ((opts)->atari ? bad_if_strict_atari : bad_if_strict_pc) | |
23 | ||
24 | /***** Formats an MS-DOS file name. Rejects invalid names. */ | |
25 | static int msdos_format_name(const unsigned char *name, int len, | |
26 | unsigned char *res, struct fat_mount_options *opts) | |
27 | /* | |
28 | * name is the proposed name, len is its length, res is | |
29 | * the resulting name, opts->name_check is either (r)elaxed, | |
30 | * (n)ormal or (s)trict, opts->dotsOK allows dots at the | |
31 | * beginning of name (for hidden files) | |
32 | */ | |
33 | { | |
34 | unsigned char *walk; | |
1da177e4 LT |
35 | unsigned char c; |
36 | int space; | |
37 | ||
38 | if (name[0] == '.') { /* dotfile because . and .. already done */ | |
39 | if (opts->dotsOK) { | |
40 | /* Get rid of dot - test for it elsewhere */ | |
41 | name++; | |
42 | len--; | |
43 | } else if (!opts->atari) | |
44 | return -EINVAL; | |
45 | } | |
46 | /* | |
47 | * disallow names that _really_ start with a dot for MS-DOS, | |
48 | * GEMDOS does not care | |
49 | */ | |
50 | space = !opts->atari; | |
51 | c = 0; | |
52 | for (walk = res; len && walk - res < 8; walk++) { | |
53 | c = *name++; | |
54 | len--; | |
55 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | |
56 | return -EINVAL; | |
57 | if (opts->name_check == 's' && strchr(bad_if_strict(opts), c)) | |
58 | return -EINVAL; | |
59 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | |
60 | return -EINVAL; | |
61 | if (c < ' ' || c == ':' || c == '\\') | |
62 | return -EINVAL; | |
63 | /* | |
64 | * 0xE5 is legal as a first character, but we must substitute | |
65 | * 0x05 because 0xE5 marks deleted files. Yes, DOS really | |
66 | * does this. | |
67 | * It seems that Microsoft hacked DOS to support non-US | |
68 | * characters after the 0xE5 character was already in use to | |
69 | * mark deleted files. | |
70 | */ | |
71 | if ((res == walk) && (c == 0xE5)) | |
72 | c = 0x05; | |
73 | if (c == '.') | |
74 | break; | |
75 | space = (c == ' '); | |
76 | *walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c; | |
77 | } | |
78 | if (space) | |
79 | return -EINVAL; | |
80 | if (opts->name_check == 's' && len && c != '.') { | |
81 | c = *name++; | |
82 | len--; | |
83 | if (c != '.') | |
84 | return -EINVAL; | |
85 | } | |
86 | while (c != '.' && len--) | |
87 | c = *name++; | |
88 | if (c == '.') { | |
89 | while (walk - res < 8) | |
90 | *walk++ = ' '; | |
91 | while (len > 0 && walk - res < MSDOS_NAME) { | |
92 | c = *name++; | |
93 | len--; | |
94 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | |
95 | return -EINVAL; | |
96 | if (opts->name_check == 's' && | |
97 | strchr(bad_if_strict(opts), c)) | |
98 | return -EINVAL; | |
99 | if (c < ' ' || c == ':' || c == '\\') | |
100 | return -EINVAL; | |
101 | if (c == '.') { | |
102 | if (opts->name_check == 's') | |
103 | return -EINVAL; | |
104 | break; | |
105 | } | |
106 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | |
107 | return -EINVAL; | |
108 | space = c == ' '; | |
109 | if (!opts->nocase && c >= 'a' && c <= 'z') | |
110 | *walk++ = c - 32; | |
111 | else | |
112 | *walk++ = c; | |
113 | } | |
114 | if (space) | |
115 | return -EINVAL; | |
116 | if (opts->name_check == 's' && len) | |
117 | return -EINVAL; | |
118 | } | |
119 | while (walk - res < MSDOS_NAME) | |
120 | *walk++ = ' '; | |
094e320d | 121 | |
1da177e4 LT |
122 | return 0; |
123 | } | |
124 | ||
125 | /***** Locates a directory entry. Uses unformatted name. */ | |
126 | static int msdos_find(struct inode *dir, const unsigned char *name, int len, | |
127 | struct fat_slot_info *sinfo) | |
128 | { | |
129 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); | |
130 | unsigned char msdos_name[MSDOS_NAME]; | |
131 | int err; | |
132 | ||
133 | err = msdos_format_name(name, len, msdos_name, &sbi->options); | |
134 | if (err) | |
135 | return -ENOENT; | |
136 | ||
137 | err = fat_scan(dir, msdos_name, sinfo); | |
138 | if (!err && sbi->options.dotsOK) { | |
139 | if (name[0] == '.') { | |
140 | if (!(sinfo->de->attr & ATTR_HIDDEN)) | |
141 | err = -ENOENT; | |
142 | } else { | |
143 | if (sinfo->de->attr & ATTR_HIDDEN) | |
144 | err = -ENOENT; | |
145 | } | |
146 | if (err) | |
147 | brelse(sinfo->bh); | |
148 | } | |
149 | return err; | |
150 | } | |
151 | ||
152 | /* | |
153 | * Compute the hash for the msdos name corresponding to the dentry. | |
154 | * Note: if the name is invalid, we leave the hash code unchanged so | |
155 | * that the existing dentry can be used. The msdos fs routines will | |
156 | * return ENOENT or EINVAL as appropriate. | |
157 | */ | |
158 | static int msdos_hash(struct dentry *dentry, struct qstr *qstr) | |
159 | { | |
160 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; | |
161 | unsigned char msdos_name[MSDOS_NAME]; | |
162 | int error; | |
163 | ||
164 | error = msdos_format_name(qstr->name, qstr->len, msdos_name, options); | |
165 | if (!error) | |
166 | qstr->hash = full_name_hash(msdos_name, MSDOS_NAME); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Compare two msdos names. If either of the names are invalid, | |
172 | * we fall back to doing the standard name comparison. | |
173 | */ | |
174 | static int msdos_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b) | |
175 | { | |
176 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; | |
177 | unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME]; | |
178 | int error; | |
179 | ||
180 | error = msdos_format_name(a->name, a->len, a_msdos_name, options); | |
181 | if (error) | |
182 | goto old_compare; | |
183 | error = msdos_format_name(b->name, b->len, b_msdos_name, options); | |
184 | if (error) | |
185 | goto old_compare; | |
186 | error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME); | |
187 | out: | |
188 | return error; | |
189 | ||
190 | old_compare: | |
191 | error = 1; | |
192 | if (a->len == b->len) | |
193 | error = memcmp(a->name, b->name, a->len); | |
194 | goto out; | |
195 | } | |
196 | ||
197 | static struct dentry_operations msdos_dentry_operations = { | |
198 | .d_hash = msdos_hash, | |
199 | .d_compare = msdos_cmp, | |
200 | }; | |
201 | ||
202 | /* | |
203 | * AV. Wrappers for FAT sb operations. Is it wise? | |
204 | */ | |
205 | ||
206 | /***** Get inode using directory and name */ | |
207 | static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry, | |
208 | struct nameidata *nd) | |
209 | { | |
210 | struct super_block *sb = dir->i_sb; | |
211 | struct fat_slot_info sinfo; | |
212 | struct inode *inode = NULL; | |
213 | int res; | |
214 | ||
215 | dentry->d_op = &msdos_dentry_operations; | |
216 | ||
217 | lock_kernel(); | |
218 | res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | |
219 | if (res == -ENOENT) | |
220 | goto add; | |
221 | if (res < 0) | |
222 | goto out; | |
223 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
224 | brelse(sinfo.bh); | |
225 | if (IS_ERR(inode)) { | |
226 | res = PTR_ERR(inode); | |
227 | goto out; | |
228 | } | |
229 | add: | |
230 | res = 0; | |
231 | dentry = d_splice_alias(inode, dentry); | |
232 | if (dentry) | |
233 | dentry->d_op = &msdos_dentry_operations; | |
234 | out: | |
235 | unlock_kernel(); | |
236 | if (!res) | |
237 | return dentry; | |
238 | return ERR_PTR(res); | |
239 | } | |
240 | ||
241 | /***** Creates a directory entry (name is already formatted). */ | |
242 | static int msdos_add_entry(struct inode *dir, const unsigned char *name, | |
243 | int is_dir, int is_hid, int cluster, | |
244 | struct timespec *ts, struct fat_slot_info *sinfo) | |
245 | { | |
246 | struct msdos_dir_entry de; | |
247 | __le16 time, date; | |
248 | int err; | |
249 | ||
250 | memcpy(de.name, name, MSDOS_NAME); | |
251 | de.attr = is_dir ? ATTR_DIR : ATTR_ARCH; | |
252 | if (is_hid) | |
253 | de.attr |= ATTR_HIDDEN; | |
254 | de.lcase = 0; | |
255 | fat_date_unix2dos(ts->tv_sec, &time, &date); | |
256 | de.cdate = de.adate = 0; | |
257 | de.ctime = 0; | |
258 | de.ctime_cs = 0; | |
259 | de.time = time; | |
260 | de.date = date; | |
261 | de.start = cpu_to_le16(cluster); | |
262 | de.starthi = cpu_to_le16(cluster >> 16); | |
263 | de.size = 0; | |
264 | ||
265 | err = fat_add_entries(dir, &de, 1, sinfo); | |
266 | if (err) | |
267 | return err; | |
268 | ||
269 | dir->i_ctime = dir->i_mtime = *ts; | |
270 | if (IS_DIRSYNC(dir)) | |
271 | (void)fat_sync_inode(dir); | |
272 | else | |
273 | mark_inode_dirty(dir); | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | /***** Create a file */ | |
279 | static int msdos_create(struct inode *dir, struct dentry *dentry, int mode, | |
280 | struct nameidata *nd) | |
281 | { | |
282 | struct super_block *sb = dir->i_sb; | |
ae78bf9c | 283 | struct inode *inode = NULL; |
1da177e4 LT |
284 | struct fat_slot_info sinfo; |
285 | struct timespec ts; | |
286 | unsigned char msdos_name[MSDOS_NAME]; | |
287 | int err, is_hid; | |
288 | ||
289 | lock_kernel(); | |
290 | ||
291 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
292 | msdos_name, &MSDOS_SB(sb)->options); | |
293 | if (err) | |
294 | goto out; | |
295 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
296 | /* Have to do it due to foo vs. .foo conflicts */ | |
297 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
298 | brelse(sinfo.bh); | |
299 | err = -EINVAL; | |
300 | goto out; | |
301 | } | |
302 | ||
303 | ts = CURRENT_TIME_SEC; | |
304 | err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo); | |
305 | if (err) | |
306 | goto out; | |
307 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
308 | brelse(sinfo.bh); | |
309 | if (IS_ERR(inode)) { | |
310 | err = PTR_ERR(inode); | |
311 | goto out; | |
312 | } | |
313 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
314 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
315 | ||
316 | d_instantiate(dentry, inode); | |
317 | out: | |
318 | unlock_kernel(); | |
ae78bf9c CM |
319 | if (!err) |
320 | err = fat_flush_inodes(sb, dir, inode); | |
1da177e4 LT |
321 | return err; |
322 | } | |
323 | ||
324 | /***** Remove a directory */ | |
325 | static int msdos_rmdir(struct inode *dir, struct dentry *dentry) | |
326 | { | |
327 | struct inode *inode = dentry->d_inode; | |
328 | struct fat_slot_info sinfo; | |
329 | int err; | |
330 | ||
331 | lock_kernel(); | |
332 | /* | |
333 | * Check whether the directory is not in use, then check | |
334 | * whether it is empty. | |
335 | */ | |
336 | err = fat_dir_empty(inode); | |
337 | if (err) | |
338 | goto out; | |
339 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | |
340 | if (err) | |
341 | goto out; | |
342 | ||
343 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
344 | if (err) | |
345 | goto out; | |
9a53c3a7 | 346 | drop_nlink(dir); |
1da177e4 | 347 | |
ce71ec36 | 348 | clear_nlink(inode); |
1da177e4 LT |
349 | inode->i_ctime = CURRENT_TIME_SEC; |
350 | fat_detach(inode); | |
351 | out: | |
352 | unlock_kernel(); | |
ae78bf9c CM |
353 | if (!err) |
354 | err = fat_flush_inodes(inode->i_sb, dir, inode); | |
1da177e4 LT |
355 | |
356 | return err; | |
357 | } | |
358 | ||
359 | /***** Make a directory */ | |
360 | static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
361 | { | |
362 | struct super_block *sb = dir->i_sb; | |
363 | struct fat_slot_info sinfo; | |
364 | struct inode *inode; | |
365 | unsigned char msdos_name[MSDOS_NAME]; | |
366 | struct timespec ts; | |
367 | int err, is_hid, cluster; | |
368 | ||
369 | lock_kernel(); | |
370 | ||
371 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
372 | msdos_name, &MSDOS_SB(sb)->options); | |
373 | if (err) | |
374 | goto out; | |
375 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
376 | /* foo vs .foo situation */ | |
377 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
378 | brelse(sinfo.bh); | |
379 | err = -EINVAL; | |
380 | goto out; | |
381 | } | |
382 | ||
383 | ts = CURRENT_TIME_SEC; | |
384 | cluster = fat_alloc_new_dir(dir, &ts); | |
385 | if (cluster < 0) { | |
386 | err = cluster; | |
387 | goto out; | |
388 | } | |
389 | err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo); | |
390 | if (err) | |
391 | goto out_free; | |
d8c76e6f | 392 | inc_nlink(dir); |
1da177e4 LT |
393 | |
394 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
395 | brelse(sinfo.bh); | |
396 | if (IS_ERR(inode)) { | |
397 | err = PTR_ERR(inode); | |
398 | /* the directory was completed, just return a error */ | |
399 | goto out; | |
400 | } | |
401 | inode->i_nlink = 2; | |
402 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
403 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
404 | ||
405 | d_instantiate(dentry, inode); | |
406 | ||
407 | unlock_kernel(); | |
ae78bf9c | 408 | fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
409 | return 0; |
410 | ||
411 | out_free: | |
412 | fat_free_clusters(dir, cluster); | |
413 | out: | |
414 | unlock_kernel(); | |
415 | return err; | |
416 | } | |
417 | ||
418 | /***** Unlink a file */ | |
419 | static int msdos_unlink(struct inode *dir, struct dentry *dentry) | |
420 | { | |
421 | struct inode *inode = dentry->d_inode; | |
422 | struct fat_slot_info sinfo; | |
423 | int err; | |
424 | ||
425 | lock_kernel(); | |
426 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | |
427 | if (err) | |
428 | goto out; | |
429 | ||
430 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
431 | if (err) | |
432 | goto out; | |
ce71ec36 | 433 | clear_nlink(inode); |
1da177e4 LT |
434 | inode->i_ctime = CURRENT_TIME_SEC; |
435 | fat_detach(inode); | |
436 | out: | |
437 | unlock_kernel(); | |
ae78bf9c CM |
438 | if (!err) |
439 | err = fat_flush_inodes(inode->i_sb, dir, inode); | |
1da177e4 LT |
440 | |
441 | return err; | |
442 | } | |
443 | ||
444 | static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name, | |
445 | struct dentry *old_dentry, | |
446 | struct inode *new_dir, unsigned char *new_name, | |
447 | struct dentry *new_dentry, int is_hid) | |
448 | { | |
449 | struct buffer_head *dotdot_bh; | |
450 | struct msdos_dir_entry *dotdot_de; | |
1da177e4 LT |
451 | struct inode *old_inode, *new_inode; |
452 | struct fat_slot_info old_sinfo, sinfo; | |
453 | struct timespec ts; | |
9131dd42 | 454 | loff_t dotdot_i_pos, new_i_pos; |
1da177e4 LT |
455 | int err, old_attrs, is_dir, update_dotdot, corrupt = 0; |
456 | ||
457 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; | |
458 | old_inode = old_dentry->d_inode; | |
459 | new_inode = new_dentry->d_inode; | |
460 | ||
461 | err = fat_scan(old_dir, old_name, &old_sinfo); | |
462 | if (err) { | |
463 | err = -EIO; | |
464 | goto out; | |
465 | } | |
466 | ||
467 | is_dir = S_ISDIR(old_inode->i_mode); | |
468 | update_dotdot = (is_dir && old_dir != new_dir); | |
469 | if (update_dotdot) { | |
470 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de, | |
471 | &dotdot_i_pos) < 0) { | |
472 | err = -EIO; | |
473 | goto out; | |
474 | } | |
475 | } | |
476 | ||
477 | old_attrs = MSDOS_I(old_inode)->i_attrs; | |
478 | err = fat_scan(new_dir, new_name, &sinfo); | |
479 | if (!err) { | |
480 | if (!new_inode) { | |
481 | /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */ | |
482 | if (sinfo.de != old_sinfo.de) { | |
483 | err = -EINVAL; | |
484 | goto out; | |
485 | } | |
486 | if (is_hid) | |
487 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
488 | else | |
489 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
490 | if (IS_DIRSYNC(old_dir)) { | |
491 | err = fat_sync_inode(old_inode); | |
492 | if (err) { | |
493 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
494 | goto out; | |
495 | } | |
496 | } else | |
497 | mark_inode_dirty(old_inode); | |
498 | ||
499 | old_dir->i_version++; | |
500 | old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC; | |
501 | if (IS_DIRSYNC(old_dir)) | |
502 | (void)fat_sync_inode(old_dir); | |
503 | else | |
504 | mark_inode_dirty(old_dir); | |
505 | goto out; | |
506 | } | |
507 | } | |
508 | ||
509 | ts = CURRENT_TIME_SEC; | |
510 | if (new_inode) { | |
511 | if (err) | |
512 | goto out; | |
1da177e4 LT |
513 | if (is_dir) { |
514 | err = fat_dir_empty(new_inode); | |
515 | if (err) | |
516 | goto out; | |
517 | } | |
9131dd42 | 518 | new_i_pos = MSDOS_I(new_inode)->i_pos; |
1da177e4 LT |
519 | fat_detach(new_inode); |
520 | } else { | |
521 | err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0, | |
522 | &ts, &sinfo); | |
523 | if (err) | |
524 | goto out; | |
9131dd42 | 525 | new_i_pos = sinfo.i_pos; |
1da177e4 LT |
526 | } |
527 | new_dir->i_version++; | |
528 | ||
529 | fat_detach(old_inode); | |
9131dd42 | 530 | fat_attach(old_inode, new_i_pos); |
1da177e4 LT |
531 | if (is_hid) |
532 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
533 | else | |
534 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
535 | if (IS_DIRSYNC(new_dir)) { | |
536 | err = fat_sync_inode(old_inode); | |
537 | if (err) | |
538 | goto error_inode; | |
539 | } else | |
540 | mark_inode_dirty(old_inode); | |
541 | ||
542 | if (update_dotdot) { | |
543 | int start = MSDOS_I(new_dir)->i_logstart; | |
544 | dotdot_de->start = cpu_to_le16(start); | |
545 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
546 | mark_buffer_dirty(dotdot_bh); | |
547 | if (IS_DIRSYNC(new_dir)) { | |
548 | err = sync_dirty_buffer(dotdot_bh); | |
549 | if (err) | |
550 | goto error_dotdot; | |
551 | } | |
9a53c3a7 | 552 | drop_nlink(old_dir); |
1da177e4 | 553 | if (!new_inode) |
d8c76e6f | 554 | inc_nlink(new_dir); |
1da177e4 LT |
555 | } |
556 | ||
557 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ | |
558 | old_sinfo.bh = NULL; | |
559 | if (err) | |
560 | goto error_dotdot; | |
561 | old_dir->i_version++; | |
562 | old_dir->i_ctime = old_dir->i_mtime = ts; | |
563 | if (IS_DIRSYNC(old_dir)) | |
564 | (void)fat_sync_inode(old_dir); | |
565 | else | |
566 | mark_inode_dirty(old_dir); | |
567 | ||
568 | if (new_inode) { | |
9a53c3a7 | 569 | drop_nlink(new_inode); |
1da177e4 | 570 | if (is_dir) |
9a53c3a7 | 571 | drop_nlink(new_inode); |
1da177e4 LT |
572 | new_inode->i_ctime = ts; |
573 | } | |
574 | out: | |
575 | brelse(sinfo.bh); | |
576 | brelse(dotdot_bh); | |
577 | brelse(old_sinfo.bh); | |
578 | return err; | |
579 | ||
580 | error_dotdot: | |
581 | /* data cluster is shared, serious corruption */ | |
582 | corrupt = 1; | |
583 | ||
584 | if (update_dotdot) { | |
585 | int start = MSDOS_I(old_dir)->i_logstart; | |
586 | dotdot_de->start = cpu_to_le16(start); | |
587 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
588 | mark_buffer_dirty(dotdot_bh); | |
589 | corrupt |= sync_dirty_buffer(dotdot_bh); | |
590 | } | |
591 | error_inode: | |
592 | fat_detach(old_inode); | |
593 | fat_attach(old_inode, old_sinfo.i_pos); | |
594 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
595 | if (new_inode) { | |
9131dd42 | 596 | fat_attach(new_inode, new_i_pos); |
1da177e4 LT |
597 | if (corrupt) |
598 | corrupt |= fat_sync_inode(new_inode); | |
599 | } else { | |
600 | /* | |
601 | * If new entry was not sharing the data cluster, it | |
602 | * shouldn't be serious corruption. | |
603 | */ | |
604 | int err2 = fat_remove_entries(new_dir, &sinfo); | |
605 | if (corrupt) | |
606 | corrupt |= err2; | |
607 | sinfo.bh = NULL; | |
608 | } | |
609 | if (corrupt < 0) { | |
610 | fat_fs_panic(new_dir->i_sb, | |
611 | "%s: Filesystem corrupted (i_pos %lld)", | |
612 | __FUNCTION__, sinfo.i_pos); | |
613 | } | |
614 | goto out; | |
615 | } | |
616 | ||
617 | /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */ | |
618 | static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry, | |
619 | struct inode *new_dir, struct dentry *new_dentry) | |
620 | { | |
621 | unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME]; | |
622 | int err, is_hid; | |
623 | ||
624 | lock_kernel(); | |
625 | ||
626 | err = msdos_format_name(old_dentry->d_name.name, | |
627 | old_dentry->d_name.len, old_msdos_name, | |
628 | &MSDOS_SB(old_dir->i_sb)->options); | |
629 | if (err) | |
630 | goto out; | |
631 | err = msdos_format_name(new_dentry->d_name.name, | |
632 | new_dentry->d_name.len, new_msdos_name, | |
633 | &MSDOS_SB(new_dir->i_sb)->options); | |
634 | if (err) | |
635 | goto out; | |
636 | ||
637 | is_hid = | |
638 | (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.'); | |
639 | ||
640 | err = do_msdos_rename(old_dir, old_msdos_name, old_dentry, | |
641 | new_dir, new_msdos_name, new_dentry, is_hid); | |
642 | out: | |
643 | unlock_kernel(); | |
ae78bf9c CM |
644 | if (!err) |
645 | err = fat_flush_inodes(old_dir->i_sb, old_dir, new_dir); | |
1da177e4 LT |
646 | return err; |
647 | } | |
648 | ||
92e1d5be | 649 | static const struct inode_operations msdos_dir_inode_operations = { |
1da177e4 LT |
650 | .create = msdos_create, |
651 | .lookup = msdos_lookup, | |
652 | .unlink = msdos_unlink, | |
653 | .mkdir = msdos_mkdir, | |
654 | .rmdir = msdos_rmdir, | |
655 | .rename = msdos_rename, | |
656 | .setattr = fat_notify_change, | |
da63fc7c | 657 | .getattr = fat_getattr, |
1da177e4 LT |
658 | }; |
659 | ||
660 | static int msdos_fill_super(struct super_block *sb, void *data, int silent) | |
661 | { | |
662 | int res; | |
663 | ||
664 | res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0); | |
665 | if (res) | |
666 | return res; | |
667 | ||
668 | sb->s_flags |= MS_NOATIME; | |
669 | sb->s_root->d_op = &msdos_dentry_operations; | |
670 | return 0; | |
671 | } | |
672 | ||
454e2398 DH |
673 | static int msdos_get_sb(struct file_system_type *fs_type, |
674 | int flags, const char *dev_name, | |
675 | void *data, struct vfsmount *mnt) | |
1da177e4 | 676 | { |
454e2398 DH |
677 | return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super, |
678 | mnt); | |
1da177e4 LT |
679 | } |
680 | ||
681 | static struct file_system_type msdos_fs_type = { | |
682 | .owner = THIS_MODULE, | |
683 | .name = "msdos", | |
684 | .get_sb = msdos_get_sb, | |
685 | .kill_sb = kill_block_super, | |
686 | .fs_flags = FS_REQUIRES_DEV, | |
687 | }; | |
688 | ||
689 | static int __init init_msdos_fs(void) | |
690 | { | |
691 | return register_filesystem(&msdos_fs_type); | |
692 | } | |
693 | ||
694 | static void __exit exit_msdos_fs(void) | |
695 | { | |
696 | unregister_filesystem(&msdos_fs_type); | |
697 | } | |
698 | ||
699 | MODULE_LICENSE("GPL"); | |
700 | MODULE_AUTHOR("Werner Almesberger"); | |
701 | MODULE_DESCRIPTION("MS-DOS filesystem support"); | |
702 | ||
703 | module_init(init_msdos_fs) | |
704 | module_exit(exit_msdos_fs) |