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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> | |
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; | |
206 | struct inode *inode = NULL; | |
207 | int res; | |
208 | ||
209 | dentry->d_op = &msdos_dentry_operations; | |
210 | ||
8f593427 | 211 | lock_super(sb); |
1da177e4 LT |
212 | res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
213 | if (res == -ENOENT) | |
214 | goto add; | |
215 | if (res < 0) | |
216 | goto out; | |
217 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
218 | brelse(sinfo.bh); | |
219 | if (IS_ERR(inode)) { | |
220 | res = PTR_ERR(inode); | |
221 | goto out; | |
222 | } | |
223 | add: | |
224 | res = 0; | |
225 | dentry = d_splice_alias(inode, dentry); | |
226 | if (dentry) | |
227 | dentry->d_op = &msdos_dentry_operations; | |
228 | out: | |
8f593427 | 229 | unlock_super(sb); |
1da177e4 LT |
230 | if (!res) |
231 | return dentry; | |
232 | return ERR_PTR(res); | |
233 | } | |
234 | ||
235 | /***** Creates a directory entry (name is already formatted). */ | |
236 | static int msdos_add_entry(struct inode *dir, const unsigned char *name, | |
237 | int is_dir, int is_hid, int cluster, | |
238 | struct timespec *ts, struct fat_slot_info *sinfo) | |
239 | { | |
b271e067 | 240 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); |
1da177e4 LT |
241 | struct msdos_dir_entry de; |
242 | __le16 time, date; | |
243 | int err; | |
244 | ||
245 | memcpy(de.name, name, MSDOS_NAME); | |
246 | de.attr = is_dir ? ATTR_DIR : ATTR_ARCH; | |
247 | if (is_hid) | |
248 | de.attr |= ATTR_HIDDEN; | |
249 | de.lcase = 0; | |
7decd1cb | 250 | fat_time_unix2fat(sbi, ts, &time, &date, NULL); |
1da177e4 LT |
251 | de.cdate = de.adate = 0; |
252 | de.ctime = 0; | |
253 | de.ctime_cs = 0; | |
254 | de.time = time; | |
255 | de.date = date; | |
256 | de.start = cpu_to_le16(cluster); | |
257 | de.starthi = cpu_to_le16(cluster >> 16); | |
258 | de.size = 0; | |
259 | ||
260 | err = fat_add_entries(dir, &de, 1, sinfo); | |
261 | if (err) | |
262 | return err; | |
263 | ||
264 | dir->i_ctime = dir->i_mtime = *ts; | |
265 | if (IS_DIRSYNC(dir)) | |
266 | (void)fat_sync_inode(dir); | |
267 | else | |
268 | mark_inode_dirty(dir); | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
273 | /***** Create a file */ | |
274 | static int msdos_create(struct inode *dir, struct dentry *dentry, int mode, | |
275 | struct nameidata *nd) | |
276 | { | |
277 | struct super_block *sb = dir->i_sb; | |
ae78bf9c | 278 | struct inode *inode = NULL; |
1da177e4 LT |
279 | struct fat_slot_info sinfo; |
280 | struct timespec ts; | |
281 | unsigned char msdos_name[MSDOS_NAME]; | |
282 | int err, is_hid; | |
283 | ||
8f593427 | 284 | lock_super(sb); |
1da177e4 LT |
285 | |
286 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
287 | msdos_name, &MSDOS_SB(sb)->options); | |
288 | if (err) | |
289 | goto out; | |
290 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
291 | /* Have to do it due to foo vs. .foo conflicts */ | |
292 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
293 | brelse(sinfo.bh); | |
294 | err = -EINVAL; | |
295 | goto out; | |
296 | } | |
297 | ||
298 | ts = CURRENT_TIME_SEC; | |
299 | err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo); | |
300 | if (err) | |
301 | goto out; | |
302 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
303 | brelse(sinfo.bh); | |
304 | if (IS_ERR(inode)) { | |
305 | err = PTR_ERR(inode); | |
306 | goto out; | |
307 | } | |
308 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
309 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
310 | ||
311 | d_instantiate(dentry, inode); | |
312 | out: | |
8f593427 | 313 | unlock_super(sb); |
ae78bf9c CM |
314 | if (!err) |
315 | err = fat_flush_inodes(sb, dir, inode); | |
1da177e4 LT |
316 | return err; |
317 | } | |
318 | ||
319 | /***** Remove a directory */ | |
320 | static int msdos_rmdir(struct inode *dir, struct dentry *dentry) | |
321 | { | |
8f593427 | 322 | struct super_block *sb = dir->i_sb; |
1da177e4 LT |
323 | struct inode *inode = dentry->d_inode; |
324 | struct fat_slot_info sinfo; | |
325 | int err; | |
326 | ||
8f593427 | 327 | lock_super(sb); |
1da177e4 LT |
328 | /* |
329 | * Check whether the directory is not in use, then check | |
330 | * whether it is empty. | |
331 | */ | |
332 | err = fat_dir_empty(inode); | |
333 | if (err) | |
334 | goto out; | |
335 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | |
336 | if (err) | |
337 | goto out; | |
338 | ||
339 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
340 | if (err) | |
341 | goto out; | |
9a53c3a7 | 342 | drop_nlink(dir); |
1da177e4 | 343 | |
ce71ec36 | 344 | clear_nlink(inode); |
1da177e4 LT |
345 | inode->i_ctime = CURRENT_TIME_SEC; |
346 | fat_detach(inode); | |
347 | out: | |
8f593427 | 348 | unlock_super(sb); |
ae78bf9c | 349 | if (!err) |
8f593427 | 350 | err = fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
351 | |
352 | return err; | |
353 | } | |
354 | ||
355 | /***** Make a directory */ | |
356 | static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
357 | { | |
358 | struct super_block *sb = dir->i_sb; | |
359 | struct fat_slot_info sinfo; | |
360 | struct inode *inode; | |
361 | unsigned char msdos_name[MSDOS_NAME]; | |
362 | struct timespec ts; | |
363 | int err, is_hid, cluster; | |
364 | ||
8f593427 | 365 | lock_super(sb); |
1da177e4 LT |
366 | |
367 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
368 | msdos_name, &MSDOS_SB(sb)->options); | |
369 | if (err) | |
370 | goto out; | |
371 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
372 | /* foo vs .foo situation */ | |
373 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
374 | brelse(sinfo.bh); | |
375 | err = -EINVAL; | |
376 | goto out; | |
377 | } | |
378 | ||
379 | ts = CURRENT_TIME_SEC; | |
380 | cluster = fat_alloc_new_dir(dir, &ts); | |
381 | if (cluster < 0) { | |
382 | err = cluster; | |
383 | goto out; | |
384 | } | |
385 | err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo); | |
386 | if (err) | |
387 | goto out_free; | |
d8c76e6f | 388 | inc_nlink(dir); |
1da177e4 LT |
389 | |
390 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
391 | brelse(sinfo.bh); | |
392 | if (IS_ERR(inode)) { | |
393 | err = PTR_ERR(inode); | |
394 | /* the directory was completed, just return a error */ | |
395 | goto out; | |
396 | } | |
397 | inode->i_nlink = 2; | |
398 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
399 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
400 | ||
401 | d_instantiate(dentry, inode); | |
402 | ||
8f593427 | 403 | unlock_super(sb); |
ae78bf9c | 404 | fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
405 | return 0; |
406 | ||
407 | out_free: | |
408 | fat_free_clusters(dir, cluster); | |
409 | out: | |
8f593427 | 410 | unlock_super(sb); |
1da177e4 LT |
411 | return err; |
412 | } | |
413 | ||
414 | /***** Unlink a file */ | |
415 | static int msdos_unlink(struct inode *dir, struct dentry *dentry) | |
416 | { | |
417 | struct inode *inode = dentry->d_inode; | |
8f593427 | 418 | struct super_block *sb= inode->i_sb; |
1da177e4 LT |
419 | struct fat_slot_info sinfo; |
420 | int err; | |
421 | ||
8f593427 | 422 | lock_super(sb); |
1da177e4 LT |
423 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
424 | if (err) | |
425 | goto out; | |
426 | ||
427 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
428 | if (err) | |
429 | goto out; | |
ce71ec36 | 430 | clear_nlink(inode); |
1da177e4 LT |
431 | inode->i_ctime = CURRENT_TIME_SEC; |
432 | fat_detach(inode); | |
433 | out: | |
8f593427 | 434 | unlock_super(sb); |
ae78bf9c | 435 | if (!err) |
8f593427 | 436 | err = fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
437 | |
438 | return err; | |
439 | } | |
440 | ||
441 | static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name, | |
442 | struct dentry *old_dentry, | |
443 | struct inode *new_dir, unsigned char *new_name, | |
444 | struct dentry *new_dentry, int is_hid) | |
445 | { | |
446 | struct buffer_head *dotdot_bh; | |
447 | struct msdos_dir_entry *dotdot_de; | |
1da177e4 LT |
448 | struct inode *old_inode, *new_inode; |
449 | struct fat_slot_info old_sinfo, sinfo; | |
450 | struct timespec ts; | |
9131dd42 | 451 | loff_t dotdot_i_pos, new_i_pos; |
1da177e4 LT |
452 | int err, old_attrs, is_dir, update_dotdot, corrupt = 0; |
453 | ||
454 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; | |
455 | old_inode = old_dentry->d_inode; | |
456 | new_inode = new_dentry->d_inode; | |
457 | ||
458 | err = fat_scan(old_dir, old_name, &old_sinfo); | |
459 | if (err) { | |
460 | err = -EIO; | |
461 | goto out; | |
462 | } | |
463 | ||
464 | is_dir = S_ISDIR(old_inode->i_mode); | |
465 | update_dotdot = (is_dir && old_dir != new_dir); | |
466 | if (update_dotdot) { | |
467 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de, | |
468 | &dotdot_i_pos) < 0) { | |
469 | err = -EIO; | |
470 | goto out; | |
471 | } | |
472 | } | |
473 | ||
474 | old_attrs = MSDOS_I(old_inode)->i_attrs; | |
475 | err = fat_scan(new_dir, new_name, &sinfo); | |
476 | if (!err) { | |
477 | if (!new_inode) { | |
478 | /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */ | |
479 | if (sinfo.de != old_sinfo.de) { | |
480 | err = -EINVAL; | |
481 | goto out; | |
482 | } | |
483 | if (is_hid) | |
484 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
485 | else | |
486 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
487 | if (IS_DIRSYNC(old_dir)) { | |
488 | err = fat_sync_inode(old_inode); | |
489 | if (err) { | |
490 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
491 | goto out; | |
492 | } | |
493 | } else | |
494 | mark_inode_dirty(old_inode); | |
495 | ||
496 | old_dir->i_version++; | |
497 | old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC; | |
498 | if (IS_DIRSYNC(old_dir)) | |
499 | (void)fat_sync_inode(old_dir); | |
500 | else | |
501 | mark_inode_dirty(old_dir); | |
502 | goto out; | |
503 | } | |
504 | } | |
505 | ||
506 | ts = CURRENT_TIME_SEC; | |
507 | if (new_inode) { | |
508 | if (err) | |
509 | goto out; | |
1da177e4 LT |
510 | if (is_dir) { |
511 | err = fat_dir_empty(new_inode); | |
512 | if (err) | |
513 | goto out; | |
514 | } | |
9131dd42 | 515 | new_i_pos = MSDOS_I(new_inode)->i_pos; |
1da177e4 LT |
516 | fat_detach(new_inode); |
517 | } else { | |
518 | err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0, | |
519 | &ts, &sinfo); | |
520 | if (err) | |
521 | goto out; | |
9131dd42 | 522 | new_i_pos = sinfo.i_pos; |
1da177e4 LT |
523 | } |
524 | new_dir->i_version++; | |
525 | ||
526 | fat_detach(old_inode); | |
9131dd42 | 527 | fat_attach(old_inode, new_i_pos); |
1da177e4 LT |
528 | if (is_hid) |
529 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
530 | else | |
531 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
532 | if (IS_DIRSYNC(new_dir)) { | |
533 | err = fat_sync_inode(old_inode); | |
534 | if (err) | |
535 | goto error_inode; | |
536 | } else | |
537 | mark_inode_dirty(old_inode); | |
538 | ||
539 | if (update_dotdot) { | |
540 | int start = MSDOS_I(new_dir)->i_logstart; | |
541 | dotdot_de->start = cpu_to_le16(start); | |
542 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
543 | mark_buffer_dirty(dotdot_bh); | |
544 | if (IS_DIRSYNC(new_dir)) { | |
545 | err = sync_dirty_buffer(dotdot_bh); | |
546 | if (err) | |
547 | goto error_dotdot; | |
548 | } | |
9a53c3a7 | 549 | drop_nlink(old_dir); |
1da177e4 | 550 | if (!new_inode) |
d8c76e6f | 551 | inc_nlink(new_dir); |
1da177e4 LT |
552 | } |
553 | ||
554 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ | |
555 | old_sinfo.bh = NULL; | |
556 | if (err) | |
557 | goto error_dotdot; | |
558 | old_dir->i_version++; | |
559 | old_dir->i_ctime = old_dir->i_mtime = ts; | |
560 | if (IS_DIRSYNC(old_dir)) | |
561 | (void)fat_sync_inode(old_dir); | |
562 | else | |
563 | mark_inode_dirty(old_dir); | |
564 | ||
565 | if (new_inode) { | |
9a53c3a7 | 566 | drop_nlink(new_inode); |
1da177e4 | 567 | if (is_dir) |
9a53c3a7 | 568 | drop_nlink(new_inode); |
1da177e4 LT |
569 | new_inode->i_ctime = ts; |
570 | } | |
571 | out: | |
572 | brelse(sinfo.bh); | |
573 | brelse(dotdot_bh); | |
574 | brelse(old_sinfo.bh); | |
575 | return err; | |
576 | ||
577 | error_dotdot: | |
578 | /* data cluster is shared, serious corruption */ | |
579 | corrupt = 1; | |
580 | ||
581 | if (update_dotdot) { | |
582 | int start = MSDOS_I(old_dir)->i_logstart; | |
583 | dotdot_de->start = cpu_to_le16(start); | |
584 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
585 | mark_buffer_dirty(dotdot_bh); | |
586 | corrupt |= sync_dirty_buffer(dotdot_bh); | |
587 | } | |
588 | error_inode: | |
589 | fat_detach(old_inode); | |
590 | fat_attach(old_inode, old_sinfo.i_pos); | |
591 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
592 | if (new_inode) { | |
9131dd42 | 593 | fat_attach(new_inode, new_i_pos); |
1da177e4 LT |
594 | if (corrupt) |
595 | corrupt |= fat_sync_inode(new_inode); | |
596 | } else { | |
597 | /* | |
598 | * If new entry was not sharing the data cluster, it | |
599 | * shouldn't be serious corruption. | |
600 | */ | |
601 | int err2 = fat_remove_entries(new_dir, &sinfo); | |
602 | if (corrupt) | |
603 | corrupt |= err2; | |
604 | sinfo.bh = NULL; | |
605 | } | |
606 | if (corrupt < 0) { | |
607 | fat_fs_panic(new_dir->i_sb, | |
608 | "%s: Filesystem corrupted (i_pos %lld)", | |
8e24eea7 | 609 | __func__, sinfo.i_pos); |
1da177e4 LT |
610 | } |
611 | goto out; | |
612 | } | |
613 | ||
614 | /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */ | |
615 | static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry, | |
616 | struct inode *new_dir, struct dentry *new_dentry) | |
617 | { | |
8f593427 | 618 | struct super_block *sb = old_dir->i_sb; |
1da177e4 LT |
619 | unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME]; |
620 | int err, is_hid; | |
621 | ||
8f593427 | 622 | lock_super(sb); |
1da177e4 LT |
623 | |
624 | err = msdos_format_name(old_dentry->d_name.name, | |
625 | old_dentry->d_name.len, old_msdos_name, | |
626 | &MSDOS_SB(old_dir->i_sb)->options); | |
627 | if (err) | |
628 | goto out; | |
629 | err = msdos_format_name(new_dentry->d_name.name, | |
630 | new_dentry->d_name.len, new_msdos_name, | |
631 | &MSDOS_SB(new_dir->i_sb)->options); | |
632 | if (err) | |
633 | goto out; | |
634 | ||
635 | is_hid = | |
636 | (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.'); | |
637 | ||
638 | err = do_msdos_rename(old_dir, old_msdos_name, old_dentry, | |
639 | new_dir, new_msdos_name, new_dentry, is_hid); | |
640 | out: | |
8f593427 | 641 | unlock_super(sb); |
ae78bf9c | 642 | if (!err) |
8f593427 | 643 | err = fat_flush_inodes(sb, old_dir, new_dir); |
1da177e4 LT |
644 | return err; |
645 | } | |
646 | ||
92e1d5be | 647 | static const struct inode_operations msdos_dir_inode_operations = { |
1da177e4 LT |
648 | .create = msdos_create, |
649 | .lookup = msdos_lookup, | |
650 | .unlink = msdos_unlink, | |
651 | .mkdir = msdos_mkdir, | |
652 | .rmdir = msdos_rmdir, | |
653 | .rename = msdos_rename, | |
1278fdd3 | 654 | .setattr = fat_setattr, |
da63fc7c | 655 | .getattr = fat_getattr, |
1da177e4 LT |
656 | }; |
657 | ||
658 | static int msdos_fill_super(struct super_block *sb, void *data, int silent) | |
659 | { | |
660 | int res; | |
661 | ||
662 | res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0); | |
663 | if (res) | |
664 | return res; | |
665 | ||
666 | sb->s_flags |= MS_NOATIME; | |
667 | sb->s_root->d_op = &msdos_dentry_operations; | |
668 | return 0; | |
669 | } | |
670 | ||
454e2398 DH |
671 | static int msdos_get_sb(struct file_system_type *fs_type, |
672 | int flags, const char *dev_name, | |
673 | void *data, struct vfsmount *mnt) | |
1da177e4 | 674 | { |
454e2398 DH |
675 | return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super, |
676 | mnt); | |
1da177e4 LT |
677 | } |
678 | ||
679 | static struct file_system_type msdos_fs_type = { | |
680 | .owner = THIS_MODULE, | |
681 | .name = "msdos", | |
682 | .get_sb = msdos_get_sb, | |
683 | .kill_sb = kill_block_super, | |
684 | .fs_flags = FS_REQUIRES_DEV, | |
685 | }; | |
686 | ||
687 | static int __init init_msdos_fs(void) | |
688 | { | |
689 | return register_filesystem(&msdos_fs_type); | |
690 | } | |
691 | ||
692 | static void __exit exit_msdos_fs(void) | |
693 | { | |
694 | unregister_filesystem(&msdos_fs_type); | |
695 | } | |
696 | ||
697 | MODULE_LICENSE("GPL"); | |
698 | MODULE_AUTHOR("Werner Almesberger"); | |
699 | MODULE_DESCRIPTION("MS-DOS filesystem support"); | |
700 | ||
701 | module_init(init_msdos_fs) | |
702 | module_exit(exit_msdos_fs) |