Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/msdos/namei.c | |
4 | * | |
5 | * Written 1992,1993 by Werner Almesberger | |
6 | * Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu> | |
7 | * Rewritten for constant inumbers 1999 by Al Viro | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
2489dbab | 11 | #include <linux/iversion.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 | */ | |
da53be12 | 151 | static int msdos_hash(const struct dentry *dentry, struct qstr *qstr) |
1da177e4 LT |
152 | { |
153 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; | |
154 | unsigned char msdos_name[MSDOS_NAME]; | |
155 | int error; | |
156 | ||
157 | error = msdos_format_name(qstr->name, qstr->len, msdos_name, options); | |
158 | if (!error) | |
8387ff25 | 159 | qstr->hash = full_name_hash(dentry, msdos_name, MSDOS_NAME); |
1da177e4 LT |
160 | return 0; |
161 | } | |
162 | ||
163 | /* | |
164 | * Compare two msdos names. If either of the names are invalid, | |
165 | * we fall back to doing the standard name comparison. | |
166 | */ | |
6fa67e70 | 167 | static int msdos_cmp(const struct dentry *dentry, |
621e155a | 168 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 | 169 | { |
d3fe1985 | 170 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; |
1da177e4 LT |
171 | unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME]; |
172 | int error; | |
173 | ||
621e155a | 174 | error = msdos_format_name(name->name, name->len, a_msdos_name, options); |
1da177e4 LT |
175 | if (error) |
176 | goto old_compare; | |
621e155a | 177 | error = msdos_format_name(str, len, b_msdos_name, options); |
1da177e4 LT |
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; | |
621e155a NP |
186 | if (name->len == len) |
187 | error = memcmp(name->name, str, len); | |
1da177e4 LT |
188 | goto out; |
189 | } | |
190 | ||
ce6cdc47 | 191 | static const struct dentry_operations msdos_dentry_operations = { |
1da177e4 LT |
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, | |
00cd8dd3 | 202 | unsigned int flags) |
1da177e4 LT |
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 | |
e40b34c7 | 209 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
45cfbe35 | 210 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
a9049376 AV |
211 | switch (err) { |
212 | case -ENOENT: | |
213 | inode = NULL; | |
214 | break; | |
215 | case 0: | |
216 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
217 | brelse(sinfo.bh); | |
218 | break; | |
219 | default: | |
220 | inode = ERR_PTR(err); | |
1da177e4 | 221 | } |
e40b34c7 | 222 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
3d23985d | 223 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
224 | } |
225 | ||
226 | /***** Creates a directory entry (name is already formatted). */ | |
227 | static int msdos_add_entry(struct inode *dir, const unsigned char *name, | |
228 | int is_dir, int is_hid, int cluster, | |
f423420c | 229 | struct timespec64 *ts, struct fat_slot_info *sinfo) |
1da177e4 | 230 | { |
b271e067 | 231 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); |
1da177e4 LT |
232 | struct msdos_dir_entry de; |
233 | __le16 time, date; | |
234 | int err; | |
235 | ||
236 | memcpy(de.name, name, MSDOS_NAME); | |
237 | de.attr = is_dir ? ATTR_DIR : ATTR_ARCH; | |
238 | if (is_hid) | |
239 | de.attr |= ATTR_HIDDEN; | |
240 | de.lcase = 0; | |
7decd1cb | 241 | fat_time_unix2fat(sbi, ts, &time, &date, NULL); |
1da177e4 LT |
242 | de.cdate = de.adate = 0; |
243 | de.ctime = 0; | |
244 | de.ctime_cs = 0; | |
245 | de.time = time; | |
246 | de.date = date; | |
a943ed71 | 247 | fat_set_start(&de, cluster); |
1da177e4 LT |
248 | de.size = 0; |
249 | ||
250 | err = fat_add_entries(dir, &de, 1, sinfo); | |
251 | if (err) | |
252 | return err; | |
253 | ||
cd83f6b1 | 254 | fat_truncate_time(dir, ts, S_CTIME|S_MTIME); |
1da177e4 LT |
255 | if (IS_DIRSYNC(dir)) |
256 | (void)fat_sync_inode(dir); | |
257 | else | |
258 | mark_inode_dirty(dir); | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | /***** Create a file */ | |
6c960e68 | 264 | static int msdos_create(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 265 | struct dentry *dentry, umode_t mode, bool excl) |
1da177e4 LT |
266 | { |
267 | struct super_block *sb = dir->i_sb; | |
ae78bf9c | 268 | struct inode *inode = NULL; |
1da177e4 | 269 | struct fat_slot_info sinfo; |
95582b00 | 270 | struct timespec64 ts; |
1da177e4 LT |
271 | unsigned char msdos_name[MSDOS_NAME]; |
272 | int err, is_hid; | |
273 | ||
e40b34c7 | 274 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
275 | |
276 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
277 | msdos_name, &MSDOS_SB(sb)->options); | |
278 | if (err) | |
279 | goto out; | |
280 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
281 | /* Have to do it due to foo vs. .foo conflicts */ | |
282 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
283 | brelse(sinfo.bh); | |
284 | err = -EINVAL; | |
285 | goto out; | |
286 | } | |
287 | ||
02027d42 | 288 | ts = current_time(dir); |
f423420c | 289 | err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo); |
1da177e4 LT |
290 | if (err) |
291 | goto out; | |
292 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
293 | brelse(sinfo.bh); | |
294 | if (IS_ERR(inode)) { | |
295 | err = PTR_ERR(inode); | |
296 | goto out; | |
297 | } | |
cd83f6b1 | 298 | fat_truncate_time(inode, &ts, S_ATIME|S_CTIME|S_MTIME); |
1da177e4 LT |
299 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
300 | ||
301 | d_instantiate(dentry, inode); | |
302 | out: | |
e40b34c7 | 303 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
ae78bf9c CM |
304 | if (!err) |
305 | err = fat_flush_inodes(sb, dir, inode); | |
1da177e4 LT |
306 | return err; |
307 | } | |
308 | ||
309 | /***** Remove a directory */ | |
310 | static int msdos_rmdir(struct inode *dir, struct dentry *dentry) | |
311 | { | |
8f593427 | 312 | struct super_block *sb = dir->i_sb; |
2b0143b5 | 313 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
314 | struct fat_slot_info sinfo; |
315 | int err; | |
316 | ||
e40b34c7 | 317 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
318 | err = fat_dir_empty(inode); |
319 | if (err) | |
320 | goto out; | |
321 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | |
322 | if (err) | |
323 | goto out; | |
324 | ||
325 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
326 | if (err) | |
327 | goto out; | |
9a53c3a7 | 328 | drop_nlink(dir); |
1da177e4 | 329 | |
ce71ec36 | 330 | clear_nlink(inode); |
cd83f6b1 | 331 | fat_truncate_time(inode, NULL, S_CTIME); |
1da177e4 LT |
332 | fat_detach(inode); |
333 | out: | |
e40b34c7 | 334 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
ae78bf9c | 335 | if (!err) |
8f593427 | 336 | err = fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
337 | |
338 | return err; | |
339 | } | |
340 | ||
341 | /***** Make a directory */ | |
c54bd91e | 342 | static int msdos_mkdir(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 343 | struct dentry *dentry, umode_t mode) |
1da177e4 LT |
344 | { |
345 | struct super_block *sb = dir->i_sb; | |
346 | struct fat_slot_info sinfo; | |
347 | struct inode *inode; | |
348 | unsigned char msdos_name[MSDOS_NAME]; | |
95582b00 | 349 | struct timespec64 ts; |
1da177e4 LT |
350 | int err, is_hid, cluster; |
351 | ||
e40b34c7 | 352 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
353 | |
354 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | |
355 | msdos_name, &MSDOS_SB(sb)->options); | |
356 | if (err) | |
357 | goto out; | |
358 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | |
359 | /* foo vs .foo situation */ | |
360 | if (!fat_scan(dir, msdos_name, &sinfo)) { | |
361 | brelse(sinfo.bh); | |
362 | err = -EINVAL; | |
363 | goto out; | |
364 | } | |
365 | ||
02027d42 | 366 | ts = current_time(dir); |
f423420c | 367 | cluster = fat_alloc_new_dir(dir, &ts); |
1da177e4 LT |
368 | if (cluster < 0) { |
369 | err = cluster; | |
370 | goto out; | |
371 | } | |
f423420c | 372 | err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo); |
1da177e4 LT |
373 | if (err) |
374 | goto out_free; | |
d8c76e6f | 375 | inc_nlink(dir); |
1da177e4 LT |
376 | |
377 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | |
378 | brelse(sinfo.bh); | |
379 | if (IS_ERR(inode)) { | |
380 | err = PTR_ERR(inode); | |
381 | /* the directory was completed, just return a error */ | |
382 | goto out; | |
383 | } | |
bfe86848 | 384 | set_nlink(inode, 2); |
cd83f6b1 | 385 | fat_truncate_time(inode, &ts, S_ATIME|S_CTIME|S_MTIME); |
1da177e4 LT |
386 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
387 | ||
388 | d_instantiate(dentry, inode); | |
389 | ||
e40b34c7 | 390 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
ae78bf9c | 391 | fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
392 | return 0; |
393 | ||
394 | out_free: | |
395 | fat_free_clusters(dir, cluster); | |
396 | out: | |
e40b34c7 | 397 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
398 | return err; |
399 | } | |
400 | ||
401 | /***** Unlink a file */ | |
402 | static int msdos_unlink(struct inode *dir, struct dentry *dentry) | |
403 | { | |
2b0143b5 | 404 | struct inode *inode = d_inode(dentry); |
85cb9bf5 | 405 | struct super_block *sb = inode->i_sb; |
1da177e4 LT |
406 | struct fat_slot_info sinfo; |
407 | int err; | |
408 | ||
e40b34c7 | 409 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
410 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); |
411 | if (err) | |
412 | goto out; | |
413 | ||
414 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | |
415 | if (err) | |
416 | goto out; | |
ce71ec36 | 417 | clear_nlink(inode); |
cd83f6b1 | 418 | fat_truncate_time(inode, NULL, S_CTIME); |
1da177e4 LT |
419 | fat_detach(inode); |
420 | out: | |
e40b34c7 | 421 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
ae78bf9c | 422 | if (!err) |
8f593427 | 423 | err = fat_flush_inodes(sb, dir, inode); |
1da177e4 LT |
424 | |
425 | return err; | |
426 | } | |
427 | ||
428 | static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name, | |
429 | struct dentry *old_dentry, | |
430 | struct inode *new_dir, unsigned char *new_name, | |
431 | struct dentry *new_dentry, int is_hid) | |
432 | { | |
433 | struct buffer_head *dotdot_bh; | |
434 | struct msdos_dir_entry *dotdot_de; | |
1da177e4 LT |
435 | struct inode *old_inode, *new_inode; |
436 | struct fat_slot_info old_sinfo, sinfo; | |
95582b00 | 437 | struct timespec64 ts; |
7669e8fb | 438 | loff_t new_i_pos; |
1da177e4 LT |
439 | int err, old_attrs, is_dir, update_dotdot, corrupt = 0; |
440 | ||
441 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; | |
2b0143b5 DH |
442 | old_inode = d_inode(old_dentry); |
443 | new_inode = d_inode(new_dentry); | |
1da177e4 LT |
444 | |
445 | err = fat_scan(old_dir, old_name, &old_sinfo); | |
446 | if (err) { | |
447 | err = -EIO; | |
448 | goto out; | |
449 | } | |
450 | ||
451 | is_dir = S_ISDIR(old_inode->i_mode); | |
452 | update_dotdot = (is_dir && old_dir != new_dir); | |
453 | if (update_dotdot) { | |
7669e8fb | 454 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) { |
1da177e4 LT |
455 | err = -EIO; |
456 | goto out; | |
457 | } | |
458 | } | |
459 | ||
460 | old_attrs = MSDOS_I(old_inode)->i_attrs; | |
461 | err = fat_scan(new_dir, new_name, &sinfo); | |
462 | if (!err) { | |
463 | if (!new_inode) { | |
464 | /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */ | |
465 | if (sinfo.de != old_sinfo.de) { | |
466 | err = -EINVAL; | |
467 | goto out; | |
468 | } | |
469 | if (is_hid) | |
470 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
471 | else | |
472 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
473 | if (IS_DIRSYNC(old_dir)) { | |
474 | err = fat_sync_inode(old_inode); | |
475 | if (err) { | |
476 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
477 | goto out; | |
478 | } | |
479 | } else | |
480 | mark_inode_dirty(old_inode); | |
481 | ||
2489dbab | 482 | inode_inc_iversion(old_dir); |
cd83f6b1 | 483 | fat_truncate_time(old_dir, NULL, S_CTIME|S_MTIME); |
1da177e4 LT |
484 | if (IS_DIRSYNC(old_dir)) |
485 | (void)fat_sync_inode(old_dir); | |
486 | else | |
487 | mark_inode_dirty(old_dir); | |
488 | goto out; | |
489 | } | |
490 | } | |
491 | ||
02027d42 | 492 | ts = current_time(old_inode); |
1da177e4 LT |
493 | if (new_inode) { |
494 | if (err) | |
495 | goto out; | |
1da177e4 LT |
496 | if (is_dir) { |
497 | err = fat_dir_empty(new_inode); | |
498 | if (err) | |
499 | goto out; | |
500 | } | |
9131dd42 | 501 | new_i_pos = MSDOS_I(new_inode)->i_pos; |
1da177e4 LT |
502 | fat_detach(new_inode); |
503 | } else { | |
504 | err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0, | |
f423420c | 505 | &ts, &sinfo); |
1da177e4 LT |
506 | if (err) |
507 | goto out; | |
9131dd42 | 508 | new_i_pos = sinfo.i_pos; |
1da177e4 | 509 | } |
2489dbab | 510 | inode_inc_iversion(new_dir); |
1da177e4 LT |
511 | |
512 | fat_detach(old_inode); | |
9131dd42 | 513 | fat_attach(old_inode, new_i_pos); |
1da177e4 LT |
514 | if (is_hid) |
515 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | |
516 | else | |
517 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | |
518 | if (IS_DIRSYNC(new_dir)) { | |
519 | err = fat_sync_inode(old_inode); | |
520 | if (err) | |
521 | goto error_inode; | |
522 | } else | |
523 | mark_inode_dirty(old_inode); | |
524 | ||
525 | if (update_dotdot) { | |
a943ed71 | 526 | fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart); |
b522412a | 527 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
1da177e4 LT |
528 | if (IS_DIRSYNC(new_dir)) { |
529 | err = sync_dirty_buffer(dotdot_bh); | |
530 | if (err) | |
531 | goto error_dotdot; | |
532 | } | |
9a53c3a7 | 533 | drop_nlink(old_dir); |
1da177e4 | 534 | if (!new_inode) |
d8c76e6f | 535 | inc_nlink(new_dir); |
1da177e4 LT |
536 | } |
537 | ||
538 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ | |
539 | old_sinfo.bh = NULL; | |
540 | if (err) | |
541 | goto error_dotdot; | |
2489dbab | 542 | inode_inc_iversion(old_dir); |
cd83f6b1 | 543 | fat_truncate_time(old_dir, &ts, S_CTIME|S_MTIME); |
1da177e4 LT |
544 | if (IS_DIRSYNC(old_dir)) |
545 | (void)fat_sync_inode(old_dir); | |
546 | else | |
547 | mark_inode_dirty(old_dir); | |
548 | ||
549 | if (new_inode) { | |
9a53c3a7 | 550 | drop_nlink(new_inode); |
1da177e4 | 551 | if (is_dir) |
9a53c3a7 | 552 | drop_nlink(new_inode); |
cd83f6b1 | 553 | fat_truncate_time(new_inode, &ts, S_CTIME); |
1da177e4 LT |
554 | } |
555 | out: | |
556 | brelse(sinfo.bh); | |
557 | brelse(dotdot_bh); | |
558 | brelse(old_sinfo.bh); | |
559 | return err; | |
560 | ||
561 | error_dotdot: | |
562 | /* data cluster is shared, serious corruption */ | |
563 | corrupt = 1; | |
564 | ||
565 | if (update_dotdot) { | |
a943ed71 | 566 | fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart); |
b522412a | 567 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
1da177e4 LT |
568 | corrupt |= sync_dirty_buffer(dotdot_bh); |
569 | } | |
570 | error_inode: | |
571 | fat_detach(old_inode); | |
572 | fat_attach(old_inode, old_sinfo.i_pos); | |
573 | MSDOS_I(old_inode)->i_attrs = old_attrs; | |
574 | if (new_inode) { | |
9131dd42 | 575 | fat_attach(new_inode, new_i_pos); |
1da177e4 LT |
576 | if (corrupt) |
577 | corrupt |= fat_sync_inode(new_inode); | |
578 | } else { | |
579 | /* | |
580 | * If new entry was not sharing the data cluster, it | |
581 | * shouldn't be serious corruption. | |
582 | */ | |
583 | int err2 = fat_remove_entries(new_dir, &sinfo); | |
584 | if (corrupt) | |
585 | corrupt |= err2; | |
586 | sinfo.bh = NULL; | |
587 | } | |
588 | if (corrupt < 0) { | |
85c78591 | 589 | fat_fs_error(new_dir->i_sb, |
1da177e4 | 590 | "%s: Filesystem corrupted (i_pos %lld)", |
8e24eea7 | 591 | __func__, sinfo.i_pos); |
1da177e4 LT |
592 | } |
593 | goto out; | |
594 | } | |
595 | ||
596 | /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */ | |
e18275ae | 597 | static int msdos_rename(struct mnt_idmap *idmap, |
549c7297 | 598 | struct inode *old_dir, struct dentry *old_dentry, |
f03b8ad8 MS |
599 | struct inode *new_dir, struct dentry *new_dentry, |
600 | unsigned int flags) | |
1da177e4 | 601 | { |
8f593427 | 602 | struct super_block *sb = old_dir->i_sb; |
1da177e4 LT |
603 | unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME]; |
604 | int err, is_hid; | |
605 | ||
f03b8ad8 MS |
606 | if (flags & ~RENAME_NOREPLACE) |
607 | return -EINVAL; | |
608 | ||
e40b34c7 | 609 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
1da177e4 LT |
610 | |
611 | err = msdos_format_name(old_dentry->d_name.name, | |
612 | old_dentry->d_name.len, old_msdos_name, | |
613 | &MSDOS_SB(old_dir->i_sb)->options); | |
614 | if (err) | |
615 | goto out; | |
616 | err = msdos_format_name(new_dentry->d_name.name, | |
617 | new_dentry->d_name.len, new_msdos_name, | |
618 | &MSDOS_SB(new_dir->i_sb)->options); | |
619 | if (err) | |
620 | goto out; | |
621 | ||
622 | is_hid = | |
623 | (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.'); | |
624 | ||
625 | err = do_msdos_rename(old_dir, old_msdos_name, old_dentry, | |
626 | new_dir, new_msdos_name, new_dentry, is_hid); | |
627 | out: | |
e40b34c7 | 628 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
ae78bf9c | 629 | if (!err) |
8f593427 | 630 | err = fat_flush_inodes(sb, old_dir, new_dir); |
1da177e4 LT |
631 | return err; |
632 | } | |
633 | ||
92e1d5be | 634 | static const struct inode_operations msdos_dir_inode_operations = { |
1da177e4 LT |
635 | .create = msdos_create, |
636 | .lookup = msdos_lookup, | |
637 | .unlink = msdos_unlink, | |
638 | .mkdir = msdos_mkdir, | |
639 | .rmdir = msdos_rmdir, | |
640 | .rename = msdos_rename, | |
1278fdd3 | 641 | .setattr = fat_setattr, |
da63fc7c | 642 | .getattr = fat_getattr, |
6bb885ec | 643 | .update_time = fat_update_time, |
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 | 669 | .kill_sb = kill_block_super, |
4b789936 | 670 | .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, |
1da177e4 | 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) |