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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> | |
2489dbab | 10 | #include <linux/iversion.h> |
9e975dae | 11 | #include "fat.h" |
1da177e4 | 12 | |
1da177e4 LT |
13 | /* Characters that are undesirable in an MS-DOS file name */ |
14 | static unsigned char bad_chars[] = "*?<>|\""; | |
7557bc66 | 15 | static unsigned char bad_if_strict[] = "+=,; "; |
1da177e4 LT |
16 | |
17 | /***** Formats an MS-DOS file name. Rejects invalid names. */ | |
18 | static int msdos_format_name(const unsigned char *name, int len, | |
19 | unsigned char *res, struct fat_mount_options *opts) | |
20 | /* | |
21 | * name is the proposed name, len is its length, res is | |
22 | * the resulting name, opts->name_check is either (r)elaxed, | |
23 | * (n)ormal or (s)trict, opts->dotsOK allows dots at the | |
24 | * beginning of name (for hidden files) | |
25 | */ | |
26 | { | |
27 | unsigned char *walk; | |
1da177e4 LT |
28 | unsigned char c; |
29 | int space; | |
30 | ||
31 | if (name[0] == '.') { /* dotfile because . and .. already done */ | |
32 | if (opts->dotsOK) { | |
33 | /* Get rid of dot - test for it elsewhere */ | |
34 | name++; | |
35 | len--; | |
7557bc66 | 36 | } else |
1da177e4 LT |
37 | return -EINVAL; |
38 | } | |
39 | /* | |
7557bc66 | 40 | * disallow names that _really_ start with a dot |
1da177e4 | 41 | */ |
7557bc66 | 42 | space = 1; |
1da177e4 LT |
43 | c = 0; |
44 | for (walk = res; len && walk - res < 8; walk++) { | |
45 | c = *name++; | |
46 | len--; | |
47 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | |
48 | return -EINVAL; | |
7557bc66 | 49 | if (opts->name_check == 's' && strchr(bad_if_strict, c)) |
1da177e4 LT |
50 | return -EINVAL; |
51 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | |
52 | return -EINVAL; | |
53 | if (c < ' ' || c == ':' || c == '\\') | |
54 | return -EINVAL; | |
55 | /* | |
56 | * 0xE5 is legal as a first character, but we must substitute | |
57 | * 0x05 because 0xE5 marks deleted files. Yes, DOS really | |
58 | * does this. | |
59 | * It seems that Microsoft hacked DOS to support non-US | |
60 | * characters after the 0xE5 character was already in use to | |
61 | * mark deleted files. | |
62 | */ | |
63 | if ((res == walk) && (c == 0xE5)) | |
64 | c = 0x05; | |
65 | if (c == '.') | |
66 | break; | |
67 | space = (c == ' '); | |
68 | *walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c; | |
69 | } | |
70 | if (space) | |
71 | return -EINVAL; | |
72 | if (opts->name_check == 's' && len && c != '.') { | |
73 | c = *name++; | |
74 | len--; | |
75 | if (c != '.') | |
76 | return -EINVAL; | |
77 | } | |
78 | while (c != '.' && len--) | |
79 | c = *name++; | |
80 | if (c == '.') { | |
81 | while (walk - res < 8) | |
82 | *walk++ = ' '; | |
83 | while (len > 0 && walk - res < MSDOS_NAME) { | |
84 | c = *name++; | |
85 | len--; | |
86 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | |
87 | return -EINVAL; | |
88 | if (opts->name_check == 's' && | |
7557bc66 | 89 | strchr(bad_if_strict, c)) |
1da177e4 LT |
90 | return -EINVAL; |
91 | if (c < ' ' || c == ':' || c == '\\') | |
92 | return -EINVAL; | |
93 | if (c == '.') { | |
94 | if (opts->name_check == 's') | |
95 | return -EINVAL; | |
96 | break; | |
97 | } | |
98 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | |
99 | return -EINVAL; | |
100 | space = c == ' '; | |
101 | if (!opts->nocase && c >= 'a' && c <= 'z') | |
102 | *walk++ = c - 32; | |
103 | else | |
104 | *walk++ = c; | |
105 | } | |
106 | if (space) | |
107 | return -EINVAL; | |
108 | if (opts->name_check == 's' && len) | |
109 | return -EINVAL; | |
110 | } | |
111 | while (walk - res < MSDOS_NAME) | |
112 | *walk++ = ' '; | |
094e320d | 113 | |
1da177e4 LT |
114 | return 0; |
115 | } | |
116 | ||
117 | /***** Locates a directory entry. Uses unformatted name. */ | |
118 | static int msdos_find(struct inode *dir, const unsigned char *name, int len, | |
119 | struct fat_slot_info *sinfo) | |
120 | { | |
121 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); | |
122 | unsigned char msdos_name[MSDOS_NAME]; | |
123 | int err; | |
124 | ||
125 | err = msdos_format_name(name, len, msdos_name, &sbi->options); | |
126 | if (err) | |
127 | return -ENOENT; | |
128 | ||
129 | err = fat_scan(dir, msdos_name, sinfo); | |
130 | if (!err && sbi->options.dotsOK) { | |
131 | if (name[0] == '.') { | |
132 | if (!(sinfo->de->attr & ATTR_HIDDEN)) | |
133 | err = -ENOENT; | |
134 | } else { | |
135 | if (sinfo->de->attr & ATTR_HIDDEN) | |
136 | err = -ENOENT; | |
137 | } | |
138 | if (err) | |
139 | brelse(sinfo->bh); | |
140 | } | |
141 | return err; | |
142 | } | |
143 | ||
144 | /* | |
145 | * Compute the hash for the msdos name corresponding to the dentry. | |
146 | * Note: if the name is invalid, we leave the hash code unchanged so | |
147 | * that the existing dentry can be used. The msdos fs routines will | |
148 | * return ENOENT or EINVAL as appropriate. | |
149 | */ | |
da53be12 | 150 | static int msdos_hash(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 LT |
151 | { |
152 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; | |
153 | unsigned char msdos_name[MSDOS_NAME]; | |
154 | int error; | |
155 | ||
156 | error = msdos_format_name(qstr->name, qstr->len, msdos_name, options); | |
157 | if (!error) | |
8387ff25 | 158 | qstr->hash = full_name_hash(dentry, msdos_name, MSDOS_NAME); |
1da177e4 LT |
159 | return 0; |
160 | } | |
161 | ||
162 | /* | |
163 | * Compare two msdos names. If either of the names are invalid, | |
164 | * we fall back to doing the standard name comparison. | |
165 | */ | |
6fa67e70 | 166 | static int msdos_cmp(const struct dentry *dentry, |
621e155a | 167 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 168 | { |
d3fe1985 | 169 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; |
1da177e4 LT |
170 | unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME]; |
171 | int error; | |
172 | ||
621e155a | 173 | error = msdos_format_name(name->name, name->len, a_msdos_name, options); |
1da177e4 LT |
174 | if (error) |
175 | goto old_compare; | |
621e155a | 176 | error = msdos_format_name(str, len, b_msdos_name, options); |
1da177e4 LT |
177 | if (error) |
178 | goto old_compare; | |
179 | error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME); | |
180 | out: | |
181 | return error; | |
182 | ||
183 | old_compare: | |
184 | error = 1; | |
621e155a NP |
185 | if (name->len == len) |
186 | error = memcmp(name->name, str, len); | |
1da177e4 LT |
187 | goto out; |
188 | } | |
189 | ||
ce6cdc47 | 190 | static const struct dentry_operations msdos_dentry_operations = { |
1da177e4 LT |
191 | .d_hash = msdos_hash, |
192 | .d_compare = msdos_cmp, | |
193 | }; | |
194 | ||
195 | /* | |
196 | * AV. Wrappers for FAT sb operations. Is it wise? | |
197 | */ | |
198 | ||
199 | /***** Get inode using directory and name */ | |
200 | static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 201 | unsigned int flags) |
1da177e4 LT |
202 | { |
203 | struct super_block *sb = dir->i_sb; | |
204 | struct fat_slot_info sinfo; | |
45cfbe35 OH |
205 | struct inode *inode; |
206 | int err; | |
1da177e4 | 207 | |
e40b34c7 | 208 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
45cfbe35 | 209 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
a9049376 AV |
210 | switch (err) { |
211 | case -ENOENT: | |
212 | inode = NULL; | |
213 | break; | |
214 | case 0: | |
215 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
216 | brelse(sinfo.bh); | |
217 | break; | |
218 | default: | |
219 | inode = ERR_PTR(err); | |
1da177e4 | 220 | } |
e40b34c7 | 221 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
3d23985d | 222 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
223 | } |
224 | ||
225 | /***** Creates a directory entry (name is already formatted). */ | |
226 | static int msdos_add_entry(struct inode *dir, const unsigned char *name, | |
227 | int is_dir, int is_hid, int cluster, | |
228 | struct timespec *ts, struct fat_slot_info *sinfo) | |
229 | { | |
b271e067 | 230 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); |
1da177e4 LT |
231 | struct msdos_dir_entry de; |
232 | __le16 time, date; | |
233 | int err; | |
234 | ||
235 | memcpy(de.name, name, MSDOS_NAME); | |
236 | de.attr = is_dir ? ATTR_DIR : ATTR_ARCH; | |
237 | if (is_hid) | |
238 | de.attr |= ATTR_HIDDEN; | |
239 | de.lcase = 0; | |
7decd1cb | 240 | fat_time_unix2fat(sbi, ts, &time, &date, NULL); |
1da177e4 LT |
241 | de.cdate = de.adate = 0; |
242 | de.ctime = 0; | |
243 | de.ctime_cs = 0; | |
244 | de.time = time; | |
245 | de.date = date; | |
a943ed71 | 246 | fat_set_start(&de, cluster); |
1da177e4 LT |
247 | de.size = 0; |
248 | ||
249 | err = fat_add_entries(dir, &de, 1, sinfo); | |
250 | if (err) | |
251 | return err; | |
252 | ||
253 | dir->i_ctime = dir->i_mtime = *ts; | |
254 | if (IS_DIRSYNC(dir)) | |
255 | (void)fat_sync_inode(dir); | |
256 | else | |
257 | mark_inode_dirty(dir); | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | /***** Create a file */ | |
4acdaf27 | 263 | static int msdos_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 264 | bool excl) |
1da177e4 LT |
265 | { |
266 | struct super_block *sb = dir->i_sb; | |
ae78bf9c | 267 | struct inode *inode = NULL; |
1da177e4 LT |
268 | struct fat_slot_info sinfo; |
269 | struct timespec ts; | |
270 | unsigned char msdos_name[MSDOS_NAME]; | |
271 | int err, is_hid; | |
272 | ||
e40b34c7 | 273 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
274 | |
275 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
276 | msdos_name, &MSDOS_SB(sb)->options); | |
277 | if (err) | |
278 | goto out; | |
279 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
280 | /* Have to do it due to foo vs. .foo conflicts */ | |
281 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
282 | brelse(sinfo.bh); | |
283 | err = -EINVAL; | |
284 | goto out; | |
285 | } | |
286 | ||
02027d42 | 287 | ts = current_time(dir); |
1da177e4 LT |
288 | err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo); |
289 | if (err) | |
290 | goto out; | |
291 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
292 | brelse(sinfo.bh); | |
293 | if (IS_ERR(inode)) { | |
294 | err = PTR_ERR(inode); | |
295 | goto out; | |
296 | } | |
297 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | |
298 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
299 | ||
300 | d_instantiate(dentry, inode); | |
301 | out: | |
e40b34c7 | 302 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
ae78bf9c CM |
303 | if (!err) |
304 | err = fat_flush_inodes(sb, dir, inode); | |
1da177e4 LT |
305 | return err; |
306 | } | |
307 | ||
308 | /***** Remove a directory */ | |
309 | static int msdos_rmdir(struct inode *dir, struct dentry *dentry) | |
310 | { | |
8f593427 | 311 | struct super_block *sb = dir->i_sb; |
2b0143b5 | 312 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
313 | struct fat_slot_info sinfo; |
314 | int err; | |
315 | ||
e40b34c7 | 316 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
317 | /* |
318 | * Check whether the directory is not in use, then check | |
319 | * whether it is empty. | |
320 | */ | |
321 | err = fat_dir_empty(inode); | |
322 | if (err) | |
323 | goto out; | |
324 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | |
325 | if (err) | |
326 | goto out; | |
327 | ||
328 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
329 | if (err) | |
330 | goto out; | |
9a53c3a7 | 331 | drop_nlink(dir); |
1da177e4 | 332 | |
ce71ec36 | 333 | clear_nlink(inode); |
02027d42 | 334 | inode->i_ctime = current_time(inode); |
1da177e4 LT |
335 | fat_detach(inode); |
336 | out: | |
e40b34c7 | 337 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
ae78bf9c | 338 | if (!err) |
8f593427 | 339 | err = fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
340 | |
341 | return err; | |
342 | } | |
343 | ||
344 | /***** Make a directory */ | |
18bb1db3 | 345 | static int msdos_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
346 | { |
347 | struct super_block *sb = dir->i_sb; | |
348 | struct fat_slot_info sinfo; | |
349 | struct inode *inode; | |
350 | unsigned char msdos_name[MSDOS_NAME]; | |
351 | struct timespec ts; | |
352 | int err, is_hid, cluster; | |
353 | ||
e40b34c7 | 354 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
355 | |
356 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
357 | msdos_name, &MSDOS_SB(sb)->options); | |
358 | if (err) | |
359 | goto out; | |
360 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
361 | /* foo vs .foo situation */ | |
362 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
363 | brelse(sinfo.bh); | |
364 | err = -EINVAL; | |
365 | goto out; | |
366 | } | |
367 | ||
02027d42 | 368 | ts = current_time(dir); |
1da177e4 LT |
369 | cluster = fat_alloc_new_dir(dir, &ts); |
370 | if (cluster < 0) { | |
371 | err = cluster; | |
372 | goto out; | |
373 | } | |
374 | err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo); | |
375 | if (err) | |
376 | goto out_free; | |
d8c76e6f | 377 | inc_nlink(dir); |
1da177e4 LT |
378 | |
379 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
380 | brelse(sinfo.bh); | |
381 | if (IS_ERR(inode)) { | |
382 | err = PTR_ERR(inode); | |
383 | /* the directory was completed, just return a error */ | |
384 | goto out; | |
385 | } | |
bfe86848 | 386 | set_nlink(inode, 2); |
1da177e4 LT |
387 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; |
388 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | |
389 | ||
390 | d_instantiate(dentry, inode); | |
391 | ||
e40b34c7 | 392 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
ae78bf9c | 393 | fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
394 | return 0; |
395 | ||
396 | out_free: | |
397 | fat_free_clusters(dir, cluster); | |
398 | out: | |
e40b34c7 | 399 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
400 | return err; |
401 | } | |
402 | ||
403 | /***** Unlink a file */ | |
404 | static int msdos_unlink(struct inode *dir, struct dentry *dentry) | |
405 | { | |
2b0143b5 | 406 | struct inode *inode = d_inode(dentry); |
85cb9bf5 | 407 | struct super_block *sb = inode->i_sb; |
1da177e4 LT |
408 | struct fat_slot_info sinfo; |
409 | int err; | |
410 | ||
e40b34c7 | 411 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
412 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
413 | if (err) | |
414 | goto out; | |
415 | ||
416 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
417 | if (err) | |
418 | goto out; | |
ce71ec36 | 419 | clear_nlink(inode); |
02027d42 | 420 | inode->i_ctime = current_time(inode); |
1da177e4 LT |
421 | fat_detach(inode); |
422 | out: | |
e40b34c7 | 423 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
ae78bf9c | 424 | if (!err) |
8f593427 | 425 | err = fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
426 | |
427 | return err; | |
428 | } | |
429 | ||
430 | static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name, | |
431 | struct dentry *old_dentry, | |
432 | struct inode *new_dir, unsigned char *new_name, | |
433 | struct dentry *new_dentry, int is_hid) | |
434 | { | |
435 | struct buffer_head *dotdot_bh; | |
436 | struct msdos_dir_entry *dotdot_de; | |
1da177e4 LT |
437 | struct inode *old_inode, *new_inode; |
438 | struct fat_slot_info old_sinfo, sinfo; | |
439 | struct timespec ts; | |
7669e8fb | 440 | loff_t new_i_pos; |
1da177e4 LT |
441 | int err, old_attrs, is_dir, update_dotdot, corrupt = 0; |
442 | ||
443 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; | |
2b0143b5 DH |
444 | old_inode = d_inode(old_dentry); |
445 | new_inode = d_inode(new_dentry); | |
1da177e4 LT |
446 | |
447 | err = fat_scan(old_dir, old_name, &old_sinfo); | |
448 | if (err) { | |
449 | err = -EIO; | |
450 | goto out; | |
451 | } | |
452 | ||
453 | is_dir = S_ISDIR(old_inode->i_mode); | |
454 | update_dotdot = (is_dir && old_dir != new_dir); | |
455 | if (update_dotdot) { | |
7669e8fb | 456 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) { |
1da177e4 LT |
457 | err = -EIO; |
458 | goto out; | |
459 | } | |
460 | } | |
461 | ||
462 | old_attrs = MSDOS_I(old_inode)->i_attrs; | |
463 | err = fat_scan(new_dir, new_name, &sinfo); | |
464 | if (!err) { | |
465 | if (!new_inode) { | |
466 | /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */ | |
467 | if (sinfo.de != old_sinfo.de) { | |
468 | err = -EINVAL; | |
469 | goto out; | |
470 | } | |
471 | if (is_hid) | |
472 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
473 | else | |
474 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
475 | if (IS_DIRSYNC(old_dir)) { | |
476 | err = fat_sync_inode(old_inode); | |
477 | if (err) { | |
478 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
479 | goto out; | |
480 | } | |
481 | } else | |
482 | mark_inode_dirty(old_inode); | |
483 | ||
2489dbab | 484 | inode_inc_iversion(old_dir); |
02027d42 | 485 | old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); |
1da177e4 LT |
486 | if (IS_DIRSYNC(old_dir)) |
487 | (void)fat_sync_inode(old_dir); | |
488 | else | |
489 | mark_inode_dirty(old_dir); | |
490 | goto out; | |
491 | } | |
492 | } | |
493 | ||
02027d42 | 494 | ts = current_time(old_inode); |
1da177e4 LT |
495 | if (new_inode) { |
496 | if (err) | |
497 | goto out; | |
1da177e4 LT |
498 | if (is_dir) { |
499 | err = fat_dir_empty(new_inode); | |
500 | if (err) | |
501 | goto out; | |
502 | } | |
9131dd42 | 503 | new_i_pos = MSDOS_I(new_inode)->i_pos; |
1da177e4 LT |
504 | fat_detach(new_inode); |
505 | } else { | |
506 | err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0, | |
507 | &ts, &sinfo); | |
508 | if (err) | |
509 | goto out; | |
9131dd42 | 510 | new_i_pos = sinfo.i_pos; |
1da177e4 | 511 | } |
2489dbab | 512 | inode_inc_iversion(new_dir); |
1da177e4 LT |
513 | |
514 | fat_detach(old_inode); | |
9131dd42 | 515 | fat_attach(old_inode, new_i_pos); |
1da177e4 LT |
516 | if (is_hid) |
517 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
518 | else | |
519 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
520 | if (IS_DIRSYNC(new_dir)) { | |
521 | err = fat_sync_inode(old_inode); | |
522 | if (err) | |
523 | goto error_inode; | |
524 | } else | |
525 | mark_inode_dirty(old_inode); | |
526 | ||
527 | if (update_dotdot) { | |
a943ed71 | 528 | fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart); |
b522412a | 529 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
1da177e4 LT |
530 | if (IS_DIRSYNC(new_dir)) { |
531 | err = sync_dirty_buffer(dotdot_bh); | |
532 | if (err) | |
533 | goto error_dotdot; | |
534 | } | |
9a53c3a7 | 535 | drop_nlink(old_dir); |
1da177e4 | 536 | if (!new_inode) |
d8c76e6f | 537 | inc_nlink(new_dir); |
1da177e4 LT |
538 | } |
539 | ||
540 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ | |
541 | old_sinfo.bh = NULL; | |
542 | if (err) | |
543 | goto error_dotdot; | |
2489dbab | 544 | inode_inc_iversion(old_dir); |
1da177e4 LT |
545 | old_dir->i_ctime = old_dir->i_mtime = ts; |
546 | if (IS_DIRSYNC(old_dir)) | |
547 | (void)fat_sync_inode(old_dir); | |
548 | else | |
549 | mark_inode_dirty(old_dir); | |
550 | ||
551 | if (new_inode) { | |
9a53c3a7 | 552 | drop_nlink(new_inode); |
1da177e4 | 553 | if (is_dir) |
9a53c3a7 | 554 | drop_nlink(new_inode); |
1da177e4 LT |
555 | new_inode->i_ctime = ts; |
556 | } | |
557 | out: | |
558 | brelse(sinfo.bh); | |
559 | brelse(dotdot_bh); | |
560 | brelse(old_sinfo.bh); | |
561 | return err; | |
562 | ||
563 | error_dotdot: | |
564 | /* data cluster is shared, serious corruption */ | |
565 | corrupt = 1; | |
566 | ||
567 | if (update_dotdot) { | |
a943ed71 | 568 | fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart); |
b522412a | 569 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
1da177e4 LT |
570 | corrupt |= sync_dirty_buffer(dotdot_bh); |
571 | } | |
572 | error_inode: | |
573 | fat_detach(old_inode); | |
574 | fat_attach(old_inode, old_sinfo.i_pos); | |
575 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
576 | if (new_inode) { | |
9131dd42 | 577 | fat_attach(new_inode, new_i_pos); |
1da177e4 LT |
578 | if (corrupt) |
579 | corrupt |= fat_sync_inode(new_inode); | |
580 | } else { | |
581 | /* | |
582 | * If new entry was not sharing the data cluster, it | |
583 | * shouldn't be serious corruption. | |
584 | */ | |
585 | int err2 = fat_remove_entries(new_dir, &sinfo); | |
586 | if (corrupt) | |
587 | corrupt |= err2; | |
588 | sinfo.bh = NULL; | |
589 | } | |
590 | if (corrupt < 0) { | |
85c78591 | 591 | fat_fs_error(new_dir->i_sb, |
1da177e4 | 592 | "%s: Filesystem corrupted (i_pos %lld)", |
8e24eea7 | 593 | __func__, sinfo.i_pos); |
1da177e4 LT |
594 | } |
595 | goto out; | |
596 | } | |
597 | ||
598 | /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */ | |
599 | static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry, | |
f03b8ad8 MS |
600 | struct inode *new_dir, struct dentry *new_dentry, |
601 | unsigned int flags) | |
1da177e4 | 602 | { |
8f593427 | 603 | struct super_block *sb = old_dir->i_sb; |
1da177e4 LT |
604 | unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME]; |
605 | int err, is_hid; | |
606 | ||
f03b8ad8 MS |
607 | if (flags & ~RENAME_NOREPLACE) |
608 | return -EINVAL; | |
609 | ||
e40b34c7 | 610 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
611 | |
612 | err = msdos_format_name(old_dentry->d_name.name, | |
613 | old_dentry->d_name.len, old_msdos_name, | |
614 | &MSDOS_SB(old_dir->i_sb)->options); | |
615 | if (err) | |
616 | goto out; | |
617 | err = msdos_format_name(new_dentry->d_name.name, | |
618 | new_dentry->d_name.len, new_msdos_name, | |
619 | &MSDOS_SB(new_dir->i_sb)->options); | |
620 | if (err) | |
621 | goto out; | |
622 | ||
623 | is_hid = | |
624 | (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.'); | |
625 | ||
626 | err = do_msdos_rename(old_dir, old_msdos_name, old_dentry, | |
627 | new_dir, new_msdos_name, new_dentry, is_hid); | |
628 | out: | |
e40b34c7 | 629 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
ae78bf9c | 630 | if (!err) |
8f593427 | 631 | err = fat_flush_inodes(sb, old_dir, new_dir); |
1da177e4 LT |
632 | return err; |
633 | } | |
634 | ||
92e1d5be | 635 | static const struct inode_operations msdos_dir_inode_operations = { |
1da177e4 LT |
636 | .create = msdos_create, |
637 | .lookup = msdos_lookup, | |
638 | .unlink = msdos_unlink, | |
639 | .mkdir = msdos_mkdir, | |
640 | .rmdir = msdos_rmdir, | |
641 | .rename = msdos_rename, | |
1278fdd3 | 642 | .setattr = fat_setattr, |
da63fc7c | 643 | .getattr = fat_getattr, |
1da177e4 LT |
644 | }; |
645 | ||
3d23985d | 646 | static void setup(struct super_block *sb) |
1da177e4 | 647 | { |
384f5c96 | 648 | MSDOS_SB(sb)->dir_ops = &msdos_dir_inode_operations; |
3d23985d | 649 | sb->s_d_op = &msdos_dentry_operations; |
1751e8a6 | 650 | sb->s_flags |= SB_NOATIME; |
3d23985d AV |
651 | } |
652 | ||
653 | static int msdos_fill_super(struct super_block *sb, void *data, int silent) | |
654 | { | |
384f5c96 | 655 | return fat_fill_super(sb, data, silent, 0, setup); |
1da177e4 LT |
656 | } |
657 | ||
152a0836 | 658 | static struct dentry *msdos_mount(struct file_system_type *fs_type, |
454e2398 | 659 | int flags, const char *dev_name, |
152a0836 | 660 | void *data) |
1da177e4 | 661 | { |
152a0836 | 662 | return mount_bdev(fs_type, flags, dev_name, data, msdos_fill_super); |
1da177e4 LT |
663 | } |
664 | ||
665 | static struct file_system_type msdos_fs_type = { | |
666 | .owner = THIS_MODULE, | |
667 | .name = "msdos", | |
152a0836 | 668 | .mount = msdos_mount, |
1da177e4 LT |
669 | .kill_sb = kill_block_super, |
670 | .fs_flags = FS_REQUIRES_DEV, | |
671 | }; | |
7f78e035 | 672 | MODULE_ALIAS_FS("msdos"); |
1da177e4 LT |
673 | |
674 | static int __init init_msdos_fs(void) | |
675 | { | |
676 | return register_filesystem(&msdos_fs_type); | |
677 | } | |
678 | ||
679 | static void __exit exit_msdos_fs(void) | |
680 | { | |
681 | unregister_filesystem(&msdos_fs_type); | |
682 | } | |
683 | ||
684 | MODULE_LICENSE("GPL"); | |
685 | MODULE_AUTHOR("Werner Almesberger"); | |
686 | MODULE_DESCRIPTION("MS-DOS filesystem support"); | |
687 | ||
688 | module_init(init_msdos_fs) | |
689 | module_exit(exit_msdos_fs) |