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> | |
1da177e4 | 12 | #include <linux/smp_lock.h> |
9e975dae | 13 | #include "fat.h" |
1da177e4 | 14 | |
1da177e4 LT |
15 | /* Characters that are undesirable in an MS-DOS file name */ |
16 | static unsigned char bad_chars[] = "*?<>|\""; | |
7557bc66 | 17 | static unsigned char bad_if_strict[] = "+=,; "; |
1da177e4 LT |
18 | |
19 | /***** Formats an MS-DOS file name. Rejects invalid names. */ | |
20 | static int msdos_format_name(const unsigned char *name, int len, | |
21 | unsigned char *res, struct fat_mount_options *opts) | |
22 | /* | |
23 | * name is the proposed name, len is its length, res is | |
24 | * the resulting name, opts->name_check is either (r)elaxed, | |
25 | * (n)ormal or (s)trict, opts->dotsOK allows dots at the | |
26 | * beginning of name (for hidden files) | |
27 | */ | |
28 | { | |
29 | unsigned char *walk; | |
1da177e4 LT |
30 | unsigned char c; |
31 | int space; | |
32 | ||
33 | if (name[0] == '.') { /* dotfile because . and .. already done */ | |
34 | if (opts->dotsOK) { | |
35 | /* Get rid of dot - test for it elsewhere */ | |
36 | name++; | |
37 | len--; | |
7557bc66 | 38 | } else |
1da177e4 LT |
39 | return -EINVAL; |
40 | } | |
41 | /* | |
7557bc66 | 42 | * disallow names that _really_ start with a dot |
1da177e4 | 43 | */ |
7557bc66 | 44 | space = 1; |
1da177e4 LT |
45 | c = 0; |
46 | for (walk = res; len && walk - res < 8; walk++) { | |
47 | c = *name++; | |
48 | len--; | |
49 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | |
50 | return -EINVAL; | |
7557bc66 | 51 | if (opts->name_check == 's' && strchr(bad_if_strict, c)) |
1da177e4 LT |
52 | return -EINVAL; |
53 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | |
54 | return -EINVAL; | |
55 | if (c < ' ' || c == ':' || c == '\\') | |
56 | return -EINVAL; | |
57 | /* | |
58 | * 0xE5 is legal as a first character, but we must substitute | |
59 | * 0x05 because 0xE5 marks deleted files. Yes, DOS really | |
60 | * does this. | |
61 | * It seems that Microsoft hacked DOS to support non-US | |
62 | * characters after the 0xE5 character was already in use to | |
63 | * mark deleted files. | |
64 | */ | |
65 | if ((res == walk) && (c == 0xE5)) | |
66 | c = 0x05; | |
67 | if (c == '.') | |
68 | break; | |
69 | space = (c == ' '); | |
70 | *walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c; | |
71 | } | |
72 | if (space) | |
73 | return -EINVAL; | |
74 | if (opts->name_check == 's' && len && c != '.') { | |
75 | c = *name++; | |
76 | len--; | |
77 | if (c != '.') | |
78 | return -EINVAL; | |
79 | } | |
80 | while (c != '.' && len--) | |
81 | c = *name++; | |
82 | if (c == '.') { | |
83 | while (walk - res < 8) | |
84 | *walk++ = ' '; | |
85 | while (len > 0 && walk - res < MSDOS_NAME) { | |
86 | c = *name++; | |
87 | len--; | |
88 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | |
89 | return -EINVAL; | |
90 | if (opts->name_check == 's' && | |
7557bc66 | 91 | strchr(bad_if_strict, c)) |
1da177e4 LT |
92 | return -EINVAL; |
93 | if (c < ' ' || c == ':' || c == '\\') | |
94 | return -EINVAL; | |
95 | if (c == '.') { | |
96 | if (opts->name_check == 's') | |
97 | return -EINVAL; | |
98 | break; | |
99 | } | |
100 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | |
101 | return -EINVAL; | |
102 | space = c == ' '; | |
103 | if (!opts->nocase && c >= 'a' && c <= 'z') | |
104 | *walk++ = c - 32; | |
105 | else | |
106 | *walk++ = c; | |
107 | } | |
108 | if (space) | |
109 | return -EINVAL; | |
110 | if (opts->name_check == 's' && len) | |
111 | return -EINVAL; | |
112 | } | |
113 | while (walk - res < MSDOS_NAME) | |
114 | *walk++ = ' '; | |
094e320d | 115 | |
1da177e4 LT |
116 | return 0; |
117 | } | |
118 | ||
119 | /***** Locates a directory entry. Uses unformatted name. */ | |
120 | static int msdos_find(struct inode *dir, const unsigned char *name, int len, | |
121 | struct fat_slot_info *sinfo) | |
122 | { | |
123 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); | |
124 | unsigned char msdos_name[MSDOS_NAME]; | |
125 | int err; | |
126 | ||
127 | err = msdos_format_name(name, len, msdos_name, &sbi->options); | |
128 | if (err) | |
129 | return -ENOENT; | |
130 | ||
131 | err = fat_scan(dir, msdos_name, sinfo); | |
132 | if (!err && sbi->options.dotsOK) { | |
133 | if (name[0] == '.') { | |
134 | if (!(sinfo->de->attr & ATTR_HIDDEN)) | |
135 | err = -ENOENT; | |
136 | } else { | |
137 | if (sinfo->de->attr & ATTR_HIDDEN) | |
138 | err = -ENOENT; | |
139 | } | |
140 | if (err) | |
141 | brelse(sinfo->bh); | |
142 | } | |
143 | return err; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Compute the hash for the msdos name corresponding to the dentry. | |
148 | * Note: if the name is invalid, we leave the hash code unchanged so | |
149 | * that the existing dentry can be used. The msdos fs routines will | |
150 | * return ENOENT or EINVAL as appropriate. | |
151 | */ | |
152 | static int msdos_hash(struct dentry *dentry, struct qstr *qstr) | |
153 | { | |
154 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; | |
155 | unsigned char msdos_name[MSDOS_NAME]; | |
156 | int error; | |
157 | ||
158 | error = msdos_format_name(qstr->name, qstr->len, msdos_name, options); | |
159 | if (!error) | |
160 | qstr->hash = full_name_hash(msdos_name, MSDOS_NAME); | |
161 | return 0; | |
162 | } | |
163 | ||
164 | /* | |
165 | * Compare two msdos names. If either of the names are invalid, | |
166 | * we fall back to doing the standard name comparison. | |
167 | */ | |
168 | static int msdos_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b) | |
169 | { | |
170 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; | |
171 | unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME]; | |
172 | int error; | |
173 | ||
174 | error = msdos_format_name(a->name, a->len, a_msdos_name, options); | |
175 | if (error) | |
176 | goto old_compare; | |
177 | error = msdos_format_name(b->name, b->len, b_msdos_name, options); | |
178 | if (error) | |
179 | goto old_compare; | |
180 | error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME); | |
181 | out: | |
182 | return error; | |
183 | ||
184 | old_compare: | |
185 | error = 1; | |
186 | if (a->len == b->len) | |
187 | error = memcmp(a->name, b->name, a->len); | |
188 | goto out; | |
189 | } | |
190 | ||
191 | static struct dentry_operations msdos_dentry_operations = { | |
192 | .d_hash = msdos_hash, | |
193 | .d_compare = msdos_cmp, | |
194 | }; | |
195 | ||
196 | /* | |
197 | * AV. Wrappers for FAT sb operations. Is it wise? | |
198 | */ | |
199 | ||
200 | /***** Get inode using directory and name */ | |
201 | static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry, | |
202 | struct nameidata *nd) | |
203 | { | |
204 | struct super_block *sb = dir->i_sb; | |
205 | struct fat_slot_info sinfo; | |
45cfbe35 OH |
206 | struct inode *inode; |
207 | int err; | |
1da177e4 | 208 | |
8f593427 | 209 | lock_super(sb); |
45cfbe35 OH |
210 | |
211 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | |
212 | if (err) { | |
213 | if (err == -ENOENT) { | |
214 | inode = NULL; | |
215 | goto out; | |
216 | } | |
217 | goto error; | |
218 | } | |
219 | ||
1da177e4 LT |
220 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
221 | brelse(sinfo.bh); | |
222 | if (IS_ERR(inode)) { | |
45cfbe35 OH |
223 | err = PTR_ERR(inode); |
224 | goto error; | |
1da177e4 | 225 | } |
45cfbe35 OH |
226 | out: |
227 | unlock_super(sb); | |
228 | dentry->d_op = &msdos_dentry_operations; | |
1da177e4 LT |
229 | dentry = d_splice_alias(inode, dentry); |
230 | if (dentry) | |
231 | dentry->d_op = &msdos_dentry_operations; | |
45cfbe35 OH |
232 | return dentry; |
233 | ||
234 | error: | |
8f593427 | 235 | unlock_super(sb); |
45cfbe35 | 236 | return ERR_PTR(err); |
1da177e4 LT |
237 | } |
238 | ||
239 | /***** Creates a directory entry (name is already formatted). */ | |
240 | static int msdos_add_entry(struct inode *dir, const unsigned char *name, | |
241 | int is_dir, int is_hid, int cluster, | |
242 | struct timespec *ts, struct fat_slot_info *sinfo) | |
243 | { | |
b271e067 | 244 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); |
1da177e4 LT |
245 | struct msdos_dir_entry de; |
246 | __le16 time, date; | |
247 | int err; | |
248 | ||
249 | memcpy(de.name, name, MSDOS_NAME); | |
250 | de.attr = is_dir ? ATTR_DIR : ATTR_ARCH; | |
251 | if (is_hid) | |
252 | de.attr |= ATTR_HIDDEN; | |
253 | de.lcase = 0; | |
7decd1cb | 254 | fat_time_unix2fat(sbi, ts, &time, &date, NULL); |
1da177e4 LT |
255 | de.cdate = de.adate = 0; |
256 | de.ctime = 0; | |
257 | de.ctime_cs = 0; | |
258 | de.time = time; | |
259 | de.date = date; | |
260 | de.start = cpu_to_le16(cluster); | |
261 | de.starthi = cpu_to_le16(cluster >> 16); | |
262 | de.size = 0; | |
263 | ||
264 | err = fat_add_entries(dir, &de, 1, sinfo); | |
265 | if (err) | |
266 | return err; | |
267 | ||
268 | dir->i_ctime = dir->i_mtime = *ts; | |
269 | if (IS_DIRSYNC(dir)) | |
270 | (void)fat_sync_inode(dir); | |
271 | else | |
272 | mark_inode_dirty(dir); | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | /***** Create a file */ | |
278 | static int msdos_create(struct inode *dir, struct dentry *dentry, int mode, | |
279 | struct nameidata *nd) | |
280 | { | |
281 | struct super_block *sb = dir->i_sb; | |
ae78bf9c | 282 | struct inode *inode = NULL; |
1da177e4 LT |
283 | struct fat_slot_info sinfo; |
284 | struct timespec ts; | |
285 | unsigned char msdos_name[MSDOS_NAME]; | |
286 | int err, is_hid; | |
287 | ||
8f593427 | 288 | lock_super(sb); |
1da177e4 LT |
289 | |
290 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
291 | msdos_name, &MSDOS_SB(sb)->options); | |
292 | if (err) | |
293 | goto out; | |
294 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
295 | /* Have to do it due to foo vs. .foo conflicts */ | |
296 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
297 | brelse(sinfo.bh); | |
298 | err = -EINVAL; | |
299 | goto out; | |
300 | } | |
301 | ||
302 | ts = CURRENT_TIME_SEC; | |
303 | err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo); | |
304 | if (err) | |
305 | goto out; | |
306 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
307 | brelse(sinfo.bh); | |
308 | if (IS_ERR(inode)) { | |
309 | err = PTR_ERR(inode); | |
310 | goto out; | |
311 | } | |
312 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
313 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
314 | ||
315 | d_instantiate(dentry, inode); | |
316 | out: | |
8f593427 | 317 | unlock_super(sb); |
ae78bf9c CM |
318 | if (!err) |
319 | err = fat_flush_inodes(sb, dir, inode); | |
1da177e4 LT |
320 | return err; |
321 | } | |
322 | ||
323 | /***** Remove a directory */ | |
324 | static int msdos_rmdir(struct inode *dir, struct dentry *dentry) | |
325 | { | |
8f593427 | 326 | struct super_block *sb = dir->i_sb; |
1da177e4 LT |
327 | struct inode *inode = dentry->d_inode; |
328 | struct fat_slot_info sinfo; | |
329 | int err; | |
330 | ||
8f593427 | 331 | lock_super(sb); |
1da177e4 LT |
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: | |
8f593427 | 352 | unlock_super(sb); |
ae78bf9c | 353 | if (!err) |
8f593427 | 354 | err = fat_flush_inodes(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 | ||
8f593427 | 369 | lock_super(sb); |
1da177e4 LT |
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 | ||
8f593427 | 407 | unlock_super(sb); |
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: | |
8f593427 | 414 | unlock_super(sb); |
1da177e4 LT |
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; | |
8f593427 | 422 | struct super_block *sb= inode->i_sb; |
1da177e4 LT |
423 | struct fat_slot_info sinfo; |
424 | int err; | |
425 | ||
8f593427 | 426 | lock_super(sb); |
1da177e4 LT |
427 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
428 | if (err) | |
429 | goto out; | |
430 | ||
431 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
432 | if (err) | |
433 | goto out; | |
ce71ec36 | 434 | clear_nlink(inode); |
1da177e4 LT |
435 | inode->i_ctime = CURRENT_TIME_SEC; |
436 | fat_detach(inode); | |
437 | out: | |
8f593427 | 438 | unlock_super(sb); |
ae78bf9c | 439 | if (!err) |
8f593427 | 440 | err = fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
441 | |
442 | return err; | |
443 | } | |
444 | ||
445 | static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name, | |
446 | struct dentry *old_dentry, | |
447 | struct inode *new_dir, unsigned char *new_name, | |
448 | struct dentry *new_dentry, int is_hid) | |
449 | { | |
450 | struct buffer_head *dotdot_bh; | |
451 | struct msdos_dir_entry *dotdot_de; | |
1da177e4 LT |
452 | struct inode *old_inode, *new_inode; |
453 | struct fat_slot_info old_sinfo, sinfo; | |
454 | struct timespec ts; | |
9131dd42 | 455 | loff_t dotdot_i_pos, new_i_pos; |
1da177e4 LT |
456 | int err, old_attrs, is_dir, update_dotdot, corrupt = 0; |
457 | ||
458 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; | |
459 | old_inode = old_dentry->d_inode; | |
460 | new_inode = new_dentry->d_inode; | |
461 | ||
462 | err = fat_scan(old_dir, old_name, &old_sinfo); | |
463 | if (err) { | |
464 | err = -EIO; | |
465 | goto out; | |
466 | } | |
467 | ||
468 | is_dir = S_ISDIR(old_inode->i_mode); | |
469 | update_dotdot = (is_dir && old_dir != new_dir); | |
470 | if (update_dotdot) { | |
471 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de, | |
472 | &dotdot_i_pos) < 0) { | |
473 | err = -EIO; | |
474 | goto out; | |
475 | } | |
476 | } | |
477 | ||
478 | old_attrs = MSDOS_I(old_inode)->i_attrs; | |
479 | err = fat_scan(new_dir, new_name, &sinfo); | |
480 | if (!err) { | |
481 | if (!new_inode) { | |
482 | /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */ | |
483 | if (sinfo.de != old_sinfo.de) { | |
484 | err = -EINVAL; | |
485 | goto out; | |
486 | } | |
487 | if (is_hid) | |
488 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
489 | else | |
490 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
491 | if (IS_DIRSYNC(old_dir)) { | |
492 | err = fat_sync_inode(old_inode); | |
493 | if (err) { | |
494 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
495 | goto out; | |
496 | } | |
497 | } else | |
498 | mark_inode_dirty(old_inode); | |
499 | ||
500 | old_dir->i_version++; | |
501 | old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC; | |
502 | if (IS_DIRSYNC(old_dir)) | |
503 | (void)fat_sync_inode(old_dir); | |
504 | else | |
505 | mark_inode_dirty(old_dir); | |
506 | goto out; | |
507 | } | |
508 | } | |
509 | ||
510 | ts = CURRENT_TIME_SEC; | |
511 | if (new_inode) { | |
512 | if (err) | |
513 | goto out; | |
1da177e4 LT |
514 | if (is_dir) { |
515 | err = fat_dir_empty(new_inode); | |
516 | if (err) | |
517 | goto out; | |
518 | } | |
9131dd42 | 519 | new_i_pos = MSDOS_I(new_inode)->i_pos; |
1da177e4 LT |
520 | fat_detach(new_inode); |
521 | } else { | |
522 | err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0, | |
523 | &ts, &sinfo); | |
524 | if (err) | |
525 | goto out; | |
9131dd42 | 526 | new_i_pos = sinfo.i_pos; |
1da177e4 LT |
527 | } |
528 | new_dir->i_version++; | |
529 | ||
530 | fat_detach(old_inode); | |
9131dd42 | 531 | fat_attach(old_inode, new_i_pos); |
1da177e4 LT |
532 | if (is_hid) |
533 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
534 | else | |
535 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
536 | if (IS_DIRSYNC(new_dir)) { | |
537 | err = fat_sync_inode(old_inode); | |
538 | if (err) | |
539 | goto error_inode; | |
540 | } else | |
541 | mark_inode_dirty(old_inode); | |
542 | ||
543 | if (update_dotdot) { | |
544 | int start = MSDOS_I(new_dir)->i_logstart; | |
545 | dotdot_de->start = cpu_to_le16(start); | |
546 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
547 | mark_buffer_dirty(dotdot_bh); | |
548 | if (IS_DIRSYNC(new_dir)) { | |
549 | err = sync_dirty_buffer(dotdot_bh); | |
550 | if (err) | |
551 | goto error_dotdot; | |
552 | } | |
9a53c3a7 | 553 | drop_nlink(old_dir); |
1da177e4 | 554 | if (!new_inode) |
d8c76e6f | 555 | inc_nlink(new_dir); |
1da177e4 LT |
556 | } |
557 | ||
558 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ | |
559 | old_sinfo.bh = NULL; | |
560 | if (err) | |
561 | goto error_dotdot; | |
562 | old_dir->i_version++; | |
563 | old_dir->i_ctime = old_dir->i_mtime = ts; | |
564 | if (IS_DIRSYNC(old_dir)) | |
565 | (void)fat_sync_inode(old_dir); | |
566 | else | |
567 | mark_inode_dirty(old_dir); | |
568 | ||
569 | if (new_inode) { | |
9a53c3a7 | 570 | drop_nlink(new_inode); |
1da177e4 | 571 | if (is_dir) |
9a53c3a7 | 572 | drop_nlink(new_inode); |
1da177e4 LT |
573 | new_inode->i_ctime = ts; |
574 | } | |
575 | out: | |
576 | brelse(sinfo.bh); | |
577 | brelse(dotdot_bh); | |
578 | brelse(old_sinfo.bh); | |
579 | return err; | |
580 | ||
581 | error_dotdot: | |
582 | /* data cluster is shared, serious corruption */ | |
583 | corrupt = 1; | |
584 | ||
585 | if (update_dotdot) { | |
586 | int start = MSDOS_I(old_dir)->i_logstart; | |
587 | dotdot_de->start = cpu_to_le16(start); | |
588 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
589 | mark_buffer_dirty(dotdot_bh); | |
590 | corrupt |= sync_dirty_buffer(dotdot_bh); | |
591 | } | |
592 | error_inode: | |
593 | fat_detach(old_inode); | |
594 | fat_attach(old_inode, old_sinfo.i_pos); | |
595 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
596 | if (new_inode) { | |
9131dd42 | 597 | fat_attach(new_inode, new_i_pos); |
1da177e4 LT |
598 | if (corrupt) |
599 | corrupt |= fat_sync_inode(new_inode); | |
600 | } else { | |
601 | /* | |
602 | * If new entry was not sharing the data cluster, it | |
603 | * shouldn't be serious corruption. | |
604 | */ | |
605 | int err2 = fat_remove_entries(new_dir, &sinfo); | |
606 | if (corrupt) | |
607 | corrupt |= err2; | |
608 | sinfo.bh = NULL; | |
609 | } | |
610 | if (corrupt < 0) { | |
611 | fat_fs_panic(new_dir->i_sb, | |
612 | "%s: Filesystem corrupted (i_pos %lld)", | |
8e24eea7 | 613 | __func__, sinfo.i_pos); |
1da177e4 LT |
614 | } |
615 | goto out; | |
616 | } | |
617 | ||
618 | /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */ | |
619 | static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry, | |
620 | struct inode *new_dir, struct dentry *new_dentry) | |
621 | { | |
8f593427 | 622 | struct super_block *sb = old_dir->i_sb; |
1da177e4 LT |
623 | unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME]; |
624 | int err, is_hid; | |
625 | ||
8f593427 | 626 | lock_super(sb); |
1da177e4 LT |
627 | |
628 | err = msdos_format_name(old_dentry->d_name.name, | |
629 | old_dentry->d_name.len, old_msdos_name, | |
630 | &MSDOS_SB(old_dir->i_sb)->options); | |
631 | if (err) | |
632 | goto out; | |
633 | err = msdos_format_name(new_dentry->d_name.name, | |
634 | new_dentry->d_name.len, new_msdos_name, | |
635 | &MSDOS_SB(new_dir->i_sb)->options); | |
636 | if (err) | |
637 | goto out; | |
638 | ||
639 | is_hid = | |
640 | (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.'); | |
641 | ||
642 | err = do_msdos_rename(old_dir, old_msdos_name, old_dentry, | |
643 | new_dir, new_msdos_name, new_dentry, is_hid); | |
644 | out: | |
8f593427 | 645 | unlock_super(sb); |
ae78bf9c | 646 | if (!err) |
8f593427 | 647 | err = fat_flush_inodes(sb, old_dir, new_dir); |
1da177e4 LT |
648 | return err; |
649 | } | |
650 | ||
92e1d5be | 651 | static const struct inode_operations msdos_dir_inode_operations = { |
1da177e4 LT |
652 | .create = msdos_create, |
653 | .lookup = msdos_lookup, | |
654 | .unlink = msdos_unlink, | |
655 | .mkdir = msdos_mkdir, | |
656 | .rmdir = msdos_rmdir, | |
657 | .rename = msdos_rename, | |
1278fdd3 | 658 | .setattr = fat_setattr, |
da63fc7c | 659 | .getattr = fat_getattr, |
1da177e4 LT |
660 | }; |
661 | ||
662 | static int msdos_fill_super(struct super_block *sb, void *data, int silent) | |
663 | { | |
664 | int res; | |
665 | ||
666 | res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0); | |
667 | if (res) | |
668 | return res; | |
669 | ||
670 | sb->s_flags |= MS_NOATIME; | |
671 | sb->s_root->d_op = &msdos_dentry_operations; | |
672 | return 0; | |
673 | } | |
674 | ||
454e2398 DH |
675 | static int msdos_get_sb(struct file_system_type *fs_type, |
676 | int flags, const char *dev_name, | |
677 | void *data, struct vfsmount *mnt) | |
1da177e4 | 678 | { |
454e2398 DH |
679 | return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super, |
680 | mnt); | |
1da177e4 LT |
681 | } |
682 | ||
683 | static struct file_system_type msdos_fs_type = { | |
684 | .owner = THIS_MODULE, | |
685 | .name = "msdos", | |
686 | .get_sb = msdos_get_sb, | |
687 | .kill_sb = kill_block_super, | |
688 | .fs_flags = FS_REQUIRES_DEV, | |
689 | }; | |
690 | ||
691 | static int __init init_msdos_fs(void) | |
692 | { | |
693 | return register_filesystem(&msdos_fs_type); | |
694 | } | |
695 | ||
696 | static void __exit exit_msdos_fs(void) | |
697 | { | |
698 | unregister_filesystem(&msdos_fs_type); | |
699 | } | |
700 | ||
701 | MODULE_LICENSE("GPL"); | |
702 | MODULE_AUTHOR("Werner Almesberger"); | |
703 | MODULE_DESCRIPTION("MS-DOS filesystem support"); | |
704 | ||
705 | module_init(init_msdos_fs) | |
706 | module_exit(exit_msdos_fs) |