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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> | |
9e975dae | 12 | #include "fat.h" |
1da177e4 | 13 | |
1da177e4 LT |
14 | /* Characters that are undesirable in an MS-DOS file name */ |
15 | static unsigned char bad_chars[] = "*?<>|\""; | |
7557bc66 | 16 | static unsigned char bad_if_strict[] = "+=,; "; |
1da177e4 LT |
17 | |
18 | /***** Formats an MS-DOS file name. Rejects invalid names. */ | |
19 | static int msdos_format_name(const unsigned char *name, int len, | |
20 | unsigned char *res, struct fat_mount_options *opts) | |
21 | /* | |
22 | * name is the proposed name, len is its length, res is | |
23 | * the resulting name, opts->name_check is either (r)elaxed, | |
24 | * (n)ormal or (s)trict, opts->dotsOK allows dots at the | |
25 | * beginning of name (for hidden files) | |
26 | */ | |
27 | { | |
28 | unsigned char *walk; | |
1da177e4 LT |
29 | unsigned char c; |
30 | int space; | |
31 | ||
32 | if (name[0] == '.') { /* dotfile because . and .. already done */ | |
33 | if (opts->dotsOK) { | |
34 | /* Get rid of dot - test for it elsewhere */ | |
35 | name++; | |
36 | len--; | |
7557bc66 | 37 | } else |
1da177e4 LT |
38 | return -EINVAL; |
39 | } | |
40 | /* | |
7557bc66 | 41 | * disallow names that _really_ start with a dot |
1da177e4 | 42 | */ |
7557bc66 | 43 | space = 1; |
1da177e4 LT |
44 | c = 0; |
45 | for (walk = res; len && walk - res < 8; walk++) { | |
46 | c = *name++; | |
47 | len--; | |
48 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | |
49 | return -EINVAL; | |
7557bc66 | 50 | if (opts->name_check == 's' && strchr(bad_if_strict, c)) |
1da177e4 LT |
51 | return -EINVAL; |
52 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | |
53 | return -EINVAL; | |
54 | if (c < ' ' || c == ':' || c == '\\') | |
55 | return -EINVAL; | |
56 | /* | |
57 | * 0xE5 is legal as a first character, but we must substitute | |
58 | * 0x05 because 0xE5 marks deleted files. Yes, DOS really | |
59 | * does this. | |
60 | * It seems that Microsoft hacked DOS to support non-US | |
61 | * characters after the 0xE5 character was already in use to | |
62 | * mark deleted files. | |
63 | */ | |
64 | if ((res == walk) && (c == 0xE5)) | |
65 | c = 0x05; | |
66 | if (c == '.') | |
67 | break; | |
68 | space = (c == ' '); | |
69 | *walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c; | |
70 | } | |
71 | if (space) | |
72 | return -EINVAL; | |
73 | if (opts->name_check == 's' && len && c != '.') { | |
74 | c = *name++; | |
75 | len--; | |
76 | if (c != '.') | |
77 | return -EINVAL; | |
78 | } | |
79 | while (c != '.' && len--) | |
80 | c = *name++; | |
81 | if (c == '.') { | |
82 | while (walk - res < 8) | |
83 | *walk++ = ' '; | |
84 | while (len > 0 && walk - res < MSDOS_NAME) { | |
85 | c = *name++; | |
86 | len--; | |
87 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | |
88 | return -EINVAL; | |
89 | if (opts->name_check == 's' && | |
7557bc66 | 90 | strchr(bad_if_strict, c)) |
1da177e4 LT |
91 | return -EINVAL; |
92 | if (c < ' ' || c == ':' || c == '\\') | |
93 | return -EINVAL; | |
94 | if (c == '.') { | |
95 | if (opts->name_check == 's') | |
96 | return -EINVAL; | |
97 | break; | |
98 | } | |
99 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | |
100 | return -EINVAL; | |
101 | space = c == ' '; | |
102 | if (!opts->nocase && c >= 'a' && c <= 'z') | |
103 | *walk++ = c - 32; | |
104 | else | |
105 | *walk++ = c; | |
106 | } | |
107 | if (space) | |
108 | return -EINVAL; | |
109 | if (opts->name_check == 's' && len) | |
110 | return -EINVAL; | |
111 | } | |
112 | while (walk - res < MSDOS_NAME) | |
113 | *walk++ = ' '; | |
094e320d | 114 | |
1da177e4 LT |
115 | return 0; |
116 | } | |
117 | ||
118 | /***** Locates a directory entry. Uses unformatted name. */ | |
119 | static int msdos_find(struct inode *dir, const unsigned char *name, int len, | |
120 | struct fat_slot_info *sinfo) | |
121 | { | |
122 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); | |
123 | unsigned char msdos_name[MSDOS_NAME]; | |
124 | int err; | |
125 | ||
126 | err = msdos_format_name(name, len, msdos_name, &sbi->options); | |
127 | if (err) | |
128 | return -ENOENT; | |
129 | ||
130 | err = fat_scan(dir, msdos_name, sinfo); | |
131 | if (!err && sbi->options.dotsOK) { | |
132 | if (name[0] == '.') { | |
133 | if (!(sinfo->de->attr & ATTR_HIDDEN)) | |
134 | err = -ENOENT; | |
135 | } else { | |
136 | if (sinfo->de->attr & ATTR_HIDDEN) | |
137 | err = -ENOENT; | |
138 | } | |
139 | if (err) | |
140 | brelse(sinfo->bh); | |
141 | } | |
142 | return err; | |
143 | } | |
144 | ||
145 | /* | |
146 | * Compute the hash for the msdos name corresponding to the dentry. | |
147 | * Note: if the name is invalid, we leave the hash code unchanged so | |
148 | * that the existing dentry can be used. The msdos fs routines will | |
149 | * return ENOENT or EINVAL as appropriate. | |
150 | */ | |
b1e6a015 NP |
151 | static int msdos_hash(const struct dentry *dentry, const struct inode *inode, |
152 | struct qstr *qstr) | |
1da177e4 LT |
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 | */ | |
621e155a NP |
168 | static int msdos_cmp(const struct dentry *parent, const struct inode *pinode, |
169 | const struct dentry *dentry, const struct inode *inode, | |
170 | unsigned int len, const char *str, const struct qstr *name) | |
1da177e4 | 171 | { |
621e155a | 172 | struct fat_mount_options *options = &MSDOS_SB(parent->d_sb)->options; |
1da177e4 LT |
173 | unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME]; |
174 | int error; | |
175 | ||
621e155a | 176 | error = msdos_format_name(name->name, name->len, a_msdos_name, options); |
1da177e4 LT |
177 | if (error) |
178 | goto old_compare; | |
621e155a | 179 | error = msdos_format_name(str, len, b_msdos_name, options); |
1da177e4 LT |
180 | if (error) |
181 | goto old_compare; | |
182 | error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME); | |
183 | out: | |
184 | return error; | |
185 | ||
186 | old_compare: | |
187 | error = 1; | |
621e155a NP |
188 | if (name->len == len) |
189 | error = memcmp(name->name, str, len); | |
1da177e4 LT |
190 | goto out; |
191 | } | |
192 | ||
ce6cdc47 | 193 | static const struct dentry_operations msdos_dentry_operations = { |
1da177e4 LT |
194 | .d_hash = msdos_hash, |
195 | .d_compare = msdos_cmp, | |
196 | }; | |
197 | ||
198 | /* | |
199 | * AV. Wrappers for FAT sb operations. Is it wise? | |
200 | */ | |
201 | ||
202 | /***** Get inode using directory and name */ | |
203 | static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry, | |
204 | struct nameidata *nd) | |
205 | { | |
206 | struct super_block *sb = dir->i_sb; | |
207 | struct fat_slot_info sinfo; | |
45cfbe35 OH |
208 | struct inode *inode; |
209 | int err; | |
1da177e4 | 210 | |
8f593427 | 211 | lock_super(sb); |
45cfbe35 | 212 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
a9049376 AV |
213 | switch (err) { |
214 | case -ENOENT: | |
215 | inode = NULL; | |
216 | break; | |
217 | case 0: | |
218 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
219 | brelse(sinfo.bh); | |
220 | break; | |
221 | default: | |
222 | inode = ERR_PTR(err); | |
1da177e4 | 223 | } |
45cfbe35 | 224 | unlock_super(sb); |
3d23985d | 225 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
226 | } |
227 | ||
228 | /***** Creates a directory entry (name is already formatted). */ | |
229 | static int msdos_add_entry(struct inode *dir, const unsigned char *name, | |
230 | int is_dir, int is_hid, int cluster, | |
231 | struct timespec *ts, struct fat_slot_info *sinfo) | |
232 | { | |
b271e067 | 233 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); |
1da177e4 LT |
234 | struct msdos_dir_entry de; |
235 | __le16 time, date; | |
236 | int err; | |
237 | ||
238 | memcpy(de.name, name, MSDOS_NAME); | |
239 | de.attr = is_dir ? ATTR_DIR : ATTR_ARCH; | |
240 | if (is_hid) | |
241 | de.attr |= ATTR_HIDDEN; | |
242 | de.lcase = 0; | |
7decd1cb | 243 | fat_time_unix2fat(sbi, ts, &time, &date, NULL); |
1da177e4 LT |
244 | de.cdate = de.adate = 0; |
245 | de.ctime = 0; | |
246 | de.ctime_cs = 0; | |
247 | de.time = time; | |
248 | de.date = date; | |
249 | de.start = cpu_to_le16(cluster); | |
250 | de.starthi = cpu_to_le16(cluster >> 16); | |
251 | de.size = 0; | |
252 | ||
253 | err = fat_add_entries(dir, &de, 1, sinfo); | |
254 | if (err) | |
255 | return err; | |
256 | ||
257 | dir->i_ctime = dir->i_mtime = *ts; | |
258 | if (IS_DIRSYNC(dir)) | |
259 | (void)fat_sync_inode(dir); | |
260 | else | |
261 | mark_inode_dirty(dir); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | /***** Create a file */ | |
267 | static int msdos_create(struct inode *dir, struct dentry *dentry, int mode, | |
268 | struct nameidata *nd) | |
269 | { | |
270 | struct super_block *sb = dir->i_sb; | |
ae78bf9c | 271 | struct inode *inode = NULL; |
1da177e4 LT |
272 | struct fat_slot_info sinfo; |
273 | struct timespec ts; | |
274 | unsigned char msdos_name[MSDOS_NAME]; | |
275 | int err, is_hid; | |
276 | ||
8f593427 | 277 | lock_super(sb); |
1da177e4 LT |
278 | |
279 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
280 | msdos_name, &MSDOS_SB(sb)->options); | |
281 | if (err) | |
282 | goto out; | |
283 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
284 | /* Have to do it due to foo vs. .foo conflicts */ | |
285 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
286 | brelse(sinfo.bh); | |
287 | err = -EINVAL; | |
288 | goto out; | |
289 | } | |
290 | ||
291 | ts = CURRENT_TIME_SEC; | |
292 | err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo); | |
293 | if (err) | |
294 | goto out; | |
295 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
296 | brelse(sinfo.bh); | |
297 | if (IS_ERR(inode)) { | |
298 | err = PTR_ERR(inode); | |
299 | goto out; | |
300 | } | |
301 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
302 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
303 | ||
304 | d_instantiate(dentry, inode); | |
305 | out: | |
8f593427 | 306 | unlock_super(sb); |
ae78bf9c CM |
307 | if (!err) |
308 | err = fat_flush_inodes(sb, dir, inode); | |
1da177e4 LT |
309 | return err; |
310 | } | |
311 | ||
312 | /***** Remove a directory */ | |
313 | static int msdos_rmdir(struct inode *dir, struct dentry *dentry) | |
314 | { | |
8f593427 | 315 | struct super_block *sb = dir->i_sb; |
1da177e4 LT |
316 | struct inode *inode = dentry->d_inode; |
317 | struct fat_slot_info sinfo; | |
318 | int err; | |
319 | ||
8f593427 | 320 | lock_super(sb); |
1da177e4 LT |
321 | /* |
322 | * Check whether the directory is not in use, then check | |
323 | * whether it is empty. | |
324 | */ | |
325 | err = fat_dir_empty(inode); | |
326 | if (err) | |
327 | goto out; | |
328 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | |
329 | if (err) | |
330 | goto out; | |
331 | ||
332 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
333 | if (err) | |
334 | goto out; | |
9a53c3a7 | 335 | drop_nlink(dir); |
1da177e4 | 336 | |
ce71ec36 | 337 | clear_nlink(inode); |
1da177e4 LT |
338 | inode->i_ctime = CURRENT_TIME_SEC; |
339 | fat_detach(inode); | |
340 | out: | |
8f593427 | 341 | unlock_super(sb); |
ae78bf9c | 342 | if (!err) |
8f593427 | 343 | err = fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
344 | |
345 | return err; | |
346 | } | |
347 | ||
348 | /***** Make a directory */ | |
349 | static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
350 | { | |
351 | struct super_block *sb = dir->i_sb; | |
352 | struct fat_slot_info sinfo; | |
353 | struct inode *inode; | |
354 | unsigned char msdos_name[MSDOS_NAME]; | |
355 | struct timespec ts; | |
356 | int err, is_hid, cluster; | |
357 | ||
8f593427 | 358 | lock_super(sb); |
1da177e4 LT |
359 | |
360 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
361 | msdos_name, &MSDOS_SB(sb)->options); | |
362 | if (err) | |
363 | goto out; | |
364 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
365 | /* foo vs .foo situation */ | |
366 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
367 | brelse(sinfo.bh); | |
368 | err = -EINVAL; | |
369 | goto out; | |
370 | } | |
371 | ||
372 | ts = CURRENT_TIME_SEC; | |
373 | cluster = fat_alloc_new_dir(dir, &ts); | |
374 | if (cluster < 0) { | |
375 | err = cluster; | |
376 | goto out; | |
377 | } | |
378 | err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo); | |
379 | if (err) | |
380 | goto out_free; | |
d8c76e6f | 381 | inc_nlink(dir); |
1da177e4 LT |
382 | |
383 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
384 | brelse(sinfo.bh); | |
385 | if (IS_ERR(inode)) { | |
386 | err = PTR_ERR(inode); | |
387 | /* the directory was completed, just return a error */ | |
388 | goto out; | |
389 | } | |
390 | inode->i_nlink = 2; | |
391 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
392 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
393 | ||
394 | d_instantiate(dentry, inode); | |
395 | ||
8f593427 | 396 | unlock_super(sb); |
ae78bf9c | 397 | fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
398 | return 0; |
399 | ||
400 | out_free: | |
401 | fat_free_clusters(dir, cluster); | |
402 | out: | |
8f593427 | 403 | unlock_super(sb); |
1da177e4 LT |
404 | return err; |
405 | } | |
406 | ||
407 | /***** Unlink a file */ | |
408 | static int msdos_unlink(struct inode *dir, struct dentry *dentry) | |
409 | { | |
410 | struct inode *inode = dentry->d_inode; | |
8f593427 | 411 | struct super_block *sb= inode->i_sb; |
1da177e4 LT |
412 | struct fat_slot_info sinfo; |
413 | int err; | |
414 | ||
8f593427 | 415 | lock_super(sb); |
1da177e4 LT |
416 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
417 | if (err) | |
418 | goto out; | |
419 | ||
420 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
421 | if (err) | |
422 | goto out; | |
ce71ec36 | 423 | clear_nlink(inode); |
1da177e4 LT |
424 | inode->i_ctime = CURRENT_TIME_SEC; |
425 | fat_detach(inode); | |
426 | out: | |
8f593427 | 427 | unlock_super(sb); |
ae78bf9c | 428 | if (!err) |
8f593427 | 429 | err = fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
430 | |
431 | return err; | |
432 | } | |
433 | ||
434 | static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name, | |
435 | struct dentry *old_dentry, | |
436 | struct inode *new_dir, unsigned char *new_name, | |
437 | struct dentry *new_dentry, int is_hid) | |
438 | { | |
439 | struct buffer_head *dotdot_bh; | |
440 | struct msdos_dir_entry *dotdot_de; | |
1da177e4 LT |
441 | struct inode *old_inode, *new_inode; |
442 | struct fat_slot_info old_sinfo, sinfo; | |
443 | struct timespec ts; | |
9131dd42 | 444 | loff_t dotdot_i_pos, new_i_pos; |
1da177e4 LT |
445 | int err, old_attrs, is_dir, update_dotdot, corrupt = 0; |
446 | ||
447 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; | |
448 | old_inode = old_dentry->d_inode; | |
449 | new_inode = new_dentry->d_inode; | |
450 | ||
451 | err = fat_scan(old_dir, old_name, &old_sinfo); | |
452 | if (err) { | |
453 | err = -EIO; | |
454 | goto out; | |
455 | } | |
456 | ||
457 | is_dir = S_ISDIR(old_inode->i_mode); | |
458 | update_dotdot = (is_dir && old_dir != new_dir); | |
459 | if (update_dotdot) { | |
460 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de, | |
461 | &dotdot_i_pos) < 0) { | |
462 | err = -EIO; | |
463 | goto out; | |
464 | } | |
465 | } | |
466 | ||
467 | old_attrs = MSDOS_I(old_inode)->i_attrs; | |
468 | err = fat_scan(new_dir, new_name, &sinfo); | |
469 | if (!err) { | |
470 | if (!new_inode) { | |
471 | /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */ | |
472 | if (sinfo.de != old_sinfo.de) { | |
473 | err = -EINVAL; | |
474 | goto out; | |
475 | } | |
476 | if (is_hid) | |
477 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
478 | else | |
479 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
480 | if (IS_DIRSYNC(old_dir)) { | |
481 | err = fat_sync_inode(old_inode); | |
482 | if (err) { | |
483 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
484 | goto out; | |
485 | } | |
486 | } else | |
487 | mark_inode_dirty(old_inode); | |
488 | ||
489 | old_dir->i_version++; | |
490 | old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC; | |
491 | if (IS_DIRSYNC(old_dir)) | |
492 | (void)fat_sync_inode(old_dir); | |
493 | else | |
494 | mark_inode_dirty(old_dir); | |
495 | goto out; | |
496 | } | |
497 | } | |
498 | ||
499 | ts = CURRENT_TIME_SEC; | |
500 | if (new_inode) { | |
501 | if (err) | |
502 | goto out; | |
1da177e4 LT |
503 | if (is_dir) { |
504 | err = fat_dir_empty(new_inode); | |
505 | if (err) | |
506 | goto out; | |
507 | } | |
9131dd42 | 508 | new_i_pos = MSDOS_I(new_inode)->i_pos; |
1da177e4 LT |
509 | fat_detach(new_inode); |
510 | } else { | |
511 | err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0, | |
512 | &ts, &sinfo); | |
513 | if (err) | |
514 | goto out; | |
9131dd42 | 515 | new_i_pos = sinfo.i_pos; |
1da177e4 LT |
516 | } |
517 | new_dir->i_version++; | |
518 | ||
519 | fat_detach(old_inode); | |
9131dd42 | 520 | fat_attach(old_inode, new_i_pos); |
1da177e4 LT |
521 | if (is_hid) |
522 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
523 | else | |
524 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
525 | if (IS_DIRSYNC(new_dir)) { | |
526 | err = fat_sync_inode(old_inode); | |
527 | if (err) | |
528 | goto error_inode; | |
529 | } else | |
530 | mark_inode_dirty(old_inode); | |
531 | ||
532 | if (update_dotdot) { | |
533 | int start = MSDOS_I(new_dir)->i_logstart; | |
534 | dotdot_de->start = cpu_to_le16(start); | |
535 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
b522412a | 536 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
1da177e4 LT |
537 | if (IS_DIRSYNC(new_dir)) { |
538 | err = sync_dirty_buffer(dotdot_bh); | |
539 | if (err) | |
540 | goto error_dotdot; | |
541 | } | |
9a53c3a7 | 542 | drop_nlink(old_dir); |
1da177e4 | 543 | if (!new_inode) |
d8c76e6f | 544 | inc_nlink(new_dir); |
1da177e4 LT |
545 | } |
546 | ||
547 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ | |
548 | old_sinfo.bh = NULL; | |
549 | if (err) | |
550 | goto error_dotdot; | |
551 | old_dir->i_version++; | |
552 | old_dir->i_ctime = old_dir->i_mtime = ts; | |
553 | if (IS_DIRSYNC(old_dir)) | |
554 | (void)fat_sync_inode(old_dir); | |
555 | else | |
556 | mark_inode_dirty(old_dir); | |
557 | ||
558 | if (new_inode) { | |
9a53c3a7 | 559 | drop_nlink(new_inode); |
1da177e4 | 560 | if (is_dir) |
9a53c3a7 | 561 | drop_nlink(new_inode); |
1da177e4 LT |
562 | new_inode->i_ctime = ts; |
563 | } | |
564 | out: | |
565 | brelse(sinfo.bh); | |
566 | brelse(dotdot_bh); | |
567 | brelse(old_sinfo.bh); | |
568 | return err; | |
569 | ||
570 | error_dotdot: | |
571 | /* data cluster is shared, serious corruption */ | |
572 | corrupt = 1; | |
573 | ||
574 | if (update_dotdot) { | |
575 | int start = MSDOS_I(old_dir)->i_logstart; | |
576 | dotdot_de->start = cpu_to_le16(start); | |
577 | dotdot_de->starthi = cpu_to_le16(start >> 16); | |
b522412a | 578 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
1da177e4 LT |
579 | corrupt |= sync_dirty_buffer(dotdot_bh); |
580 | } | |
581 | error_inode: | |
582 | fat_detach(old_inode); | |
583 | fat_attach(old_inode, old_sinfo.i_pos); | |
584 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
585 | if (new_inode) { | |
9131dd42 | 586 | fat_attach(new_inode, new_i_pos); |
1da177e4 LT |
587 | if (corrupt) |
588 | corrupt |= fat_sync_inode(new_inode); | |
589 | } else { | |
590 | /* | |
591 | * If new entry was not sharing the data cluster, it | |
592 | * shouldn't be serious corruption. | |
593 | */ | |
594 | int err2 = fat_remove_entries(new_dir, &sinfo); | |
595 | if (corrupt) | |
596 | corrupt |= err2; | |
597 | sinfo.bh = NULL; | |
598 | } | |
599 | if (corrupt < 0) { | |
85c78591 | 600 | fat_fs_error(new_dir->i_sb, |
1da177e4 | 601 | "%s: Filesystem corrupted (i_pos %lld)", |
8e24eea7 | 602 | __func__, sinfo.i_pos); |
1da177e4 LT |
603 | } |
604 | goto out; | |
605 | } | |
606 | ||
607 | /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */ | |
608 | static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry, | |
609 | struct inode *new_dir, struct dentry *new_dentry) | |
610 | { | |
8f593427 | 611 | struct super_block *sb = old_dir->i_sb; |
1da177e4 LT |
612 | unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME]; |
613 | int err, is_hid; | |
614 | ||
8f593427 | 615 | lock_super(sb); |
1da177e4 LT |
616 | |
617 | err = msdos_format_name(old_dentry->d_name.name, | |
618 | old_dentry->d_name.len, old_msdos_name, | |
619 | &MSDOS_SB(old_dir->i_sb)->options); | |
620 | if (err) | |
621 | goto out; | |
622 | err = msdos_format_name(new_dentry->d_name.name, | |
623 | new_dentry->d_name.len, new_msdos_name, | |
624 | &MSDOS_SB(new_dir->i_sb)->options); | |
625 | if (err) | |
626 | goto out; | |
627 | ||
628 | is_hid = | |
629 | (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.'); | |
630 | ||
631 | err = do_msdos_rename(old_dir, old_msdos_name, old_dentry, | |
632 | new_dir, new_msdos_name, new_dentry, is_hid); | |
633 | out: | |
8f593427 | 634 | unlock_super(sb); |
ae78bf9c | 635 | if (!err) |
8f593427 | 636 | err = fat_flush_inodes(sb, old_dir, new_dir); |
1da177e4 LT |
637 | return err; |
638 | } | |
639 | ||
92e1d5be | 640 | static const struct inode_operations msdos_dir_inode_operations = { |
1da177e4 LT |
641 | .create = msdos_create, |
642 | .lookup = msdos_lookup, | |
643 | .unlink = msdos_unlink, | |
644 | .mkdir = msdos_mkdir, | |
645 | .rmdir = msdos_rmdir, | |
646 | .rename = msdos_rename, | |
1278fdd3 | 647 | .setattr = fat_setattr, |
da63fc7c | 648 | .getattr = fat_getattr, |
1da177e4 LT |
649 | }; |
650 | ||
3d23985d | 651 | static void setup(struct super_block *sb) |
1da177e4 | 652 | { |
384f5c96 | 653 | MSDOS_SB(sb)->dir_ops = &msdos_dir_inode_operations; |
3d23985d | 654 | sb->s_d_op = &msdos_dentry_operations; |
1da177e4 | 655 | sb->s_flags |= MS_NOATIME; |
3d23985d AV |
656 | } |
657 | ||
658 | static int msdos_fill_super(struct super_block *sb, void *data, int silent) | |
659 | { | |
384f5c96 | 660 | return fat_fill_super(sb, data, silent, 0, setup); |
1da177e4 LT |
661 | } |
662 | ||
152a0836 | 663 | static struct dentry *msdos_mount(struct file_system_type *fs_type, |
454e2398 | 664 | int flags, const char *dev_name, |
152a0836 | 665 | void *data) |
1da177e4 | 666 | { |
152a0836 | 667 | return mount_bdev(fs_type, flags, dev_name, data, msdos_fill_super); |
1da177e4 LT |
668 | } |
669 | ||
670 | static struct file_system_type msdos_fs_type = { | |
671 | .owner = THIS_MODULE, | |
672 | .name = "msdos", | |
152a0836 | 673 | .mount = msdos_mount, |
1da177e4 LT |
674 | .kill_sb = kill_block_super, |
675 | .fs_flags = FS_REQUIRES_DEV, | |
676 | }; | |
677 | ||
678 | static int __init init_msdos_fs(void) | |
679 | { | |
680 | return register_filesystem(&msdos_fs_type); | |
681 | } | |
682 | ||
683 | static void __exit exit_msdos_fs(void) | |
684 | { | |
685 | unregister_filesystem(&msdos_fs_type); | |
686 | } | |
687 | ||
688 | MODULE_LICENSE("GPL"); | |
689 | MODULE_AUTHOR("Werner Almesberger"); | |
690 | MODULE_DESCRIPTION("MS-DOS filesystem support"); | |
691 | ||
692 | module_init(init_msdos_fs) | |
693 | module_exit(exit_msdos_fs) |