diff options
Diffstat (limited to 'fs/msdos')
-rw-r--r-- | fs/msdos/Makefile | 7 | ||||
-rw-r--r-- | fs/msdos/namei.c | 711 |
2 files changed, 718 insertions, 0 deletions
diff --git a/fs/msdos/Makefile b/fs/msdos/Makefile new file mode 100644 index 000000000000..ea67646fcb95 --- /dev/null +++ b/fs/msdos/Makefile | |||
@@ -0,0 +1,7 @@ | |||
1 | # | ||
2 | # Makefile for the Linux msdos filesystem routines. | ||
3 | # | ||
4 | |||
5 | obj-$(CONFIG_MSDOS_FS) += msdos.o | ||
6 | |||
7 | msdos-y := namei.o | ||
diff --git a/fs/msdos/namei.c b/fs/msdos/namei.c new file mode 100644 index 000000000000..154f511c7245 --- /dev/null +++ b/fs/msdos/namei.c | |||
@@ -0,0 +1,711 @@ | |||
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> | ||
12 | #include <linux/msdos_fs.h> | ||
13 | #include <linux/smp_lock.h> | ||
14 | |||
15 | /* MS-DOS "device special files" */ | ||
16 | static const unsigned char *reserved_names[] = { | ||
17 | "CON ", "PRN ", "NUL ", "AUX ", | ||
18 | "LPT1 ", "LPT2 ", "LPT3 ", "LPT4 ", | ||
19 | "COM1 ", "COM2 ", "COM3 ", "COM4 ", | ||
20 | NULL | ||
21 | }; | ||
22 | |||
23 | /* Characters that are undesirable in an MS-DOS file name */ | ||
24 | static unsigned char bad_chars[] = "*?<>|\""; | ||
25 | static unsigned char bad_if_strict_pc[] = "+=,; "; | ||
26 | /* GEMDOS is less restrictive */ | ||
27 | static unsigned char bad_if_strict_atari[] = " "; | ||
28 | |||
29 | #define bad_if_strict(opts) \ | ||
30 | ((opts)->atari ? bad_if_strict_atari : bad_if_strict_pc) | ||
31 | |||
32 | /***** Formats an MS-DOS file name. Rejects invalid names. */ | ||
33 | static int msdos_format_name(const unsigned char *name, int len, | ||
34 | unsigned char *res, struct fat_mount_options *opts) | ||
35 | /* | ||
36 | * name is the proposed name, len is its length, res is | ||
37 | * the resulting name, opts->name_check is either (r)elaxed, | ||
38 | * (n)ormal or (s)trict, opts->dotsOK allows dots at the | ||
39 | * beginning of name (for hidden files) | ||
40 | */ | ||
41 | { | ||
42 | unsigned char *walk; | ||
43 | const unsigned char **reserved; | ||
44 | unsigned char c; | ||
45 | int space; | ||
46 | |||
47 | if (name[0] == '.') { /* dotfile because . and .. already done */ | ||
48 | if (opts->dotsOK) { | ||
49 | /* Get rid of dot - test for it elsewhere */ | ||
50 | name++; | ||
51 | len--; | ||
52 | } else if (!opts->atari) | ||
53 | return -EINVAL; | ||
54 | } | ||
55 | /* | ||
56 | * disallow names that _really_ start with a dot for MS-DOS, | ||
57 | * GEMDOS does not care | ||
58 | */ | ||
59 | space = !opts->atari; | ||
60 | c = 0; | ||
61 | for (walk = res; len && walk - res < 8; walk++) { | ||
62 | c = *name++; | ||
63 | len--; | ||
64 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | ||
65 | return -EINVAL; | ||
66 | if (opts->name_check == 's' && strchr(bad_if_strict(opts), c)) | ||
67 | return -EINVAL; | ||
68 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | ||
69 | return -EINVAL; | ||
70 | if (c < ' ' || c == ':' || c == '\\') | ||
71 | return -EINVAL; | ||
72 | /* | ||
73 | * 0xE5 is legal as a first character, but we must substitute | ||
74 | * 0x05 because 0xE5 marks deleted files. Yes, DOS really | ||
75 | * does this. | ||
76 | * It seems that Microsoft hacked DOS to support non-US | ||
77 | * characters after the 0xE5 character was already in use to | ||
78 | * mark deleted files. | ||
79 | */ | ||
80 | if ((res == walk) && (c == 0xE5)) | ||
81 | c = 0x05; | ||
82 | if (c == '.') | ||
83 | break; | ||
84 | space = (c == ' '); | ||
85 | *walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c; | ||
86 | } | ||
87 | if (space) | ||
88 | return -EINVAL; | ||
89 | if (opts->name_check == 's' && len && c != '.') { | ||
90 | c = *name++; | ||
91 | len--; | ||
92 | if (c != '.') | ||
93 | return -EINVAL; | ||
94 | } | ||
95 | while (c != '.' && len--) | ||
96 | c = *name++; | ||
97 | if (c == '.') { | ||
98 | while (walk - res < 8) | ||
99 | *walk++ = ' '; | ||
100 | while (len > 0 && walk - res < MSDOS_NAME) { | ||
101 | c = *name++; | ||
102 | len--; | ||
103 | if (opts->name_check != 'r' && strchr(bad_chars, c)) | ||
104 | return -EINVAL; | ||
105 | if (opts->name_check == 's' && | ||
106 | strchr(bad_if_strict(opts), c)) | ||
107 | return -EINVAL; | ||
108 | if (c < ' ' || c == ':' || c == '\\') | ||
109 | return -EINVAL; | ||
110 | if (c == '.') { | ||
111 | if (opts->name_check == 's') | ||
112 | return -EINVAL; | ||
113 | break; | ||
114 | } | ||
115 | if (c >= 'A' && c <= 'Z' && opts->name_check == 's') | ||
116 | return -EINVAL; | ||
117 | space = c == ' '; | ||
118 | if (!opts->nocase && c >= 'a' && c <= 'z') | ||
119 | *walk++ = c - 32; | ||
120 | else | ||
121 | *walk++ = c; | ||
122 | } | ||
123 | if (space) | ||
124 | return -EINVAL; | ||
125 | if (opts->name_check == 's' && len) | ||
126 | return -EINVAL; | ||
127 | } | ||
128 | while (walk - res < MSDOS_NAME) | ||
129 | *walk++ = ' '; | ||
130 | if (!opts->atari) | ||
131 | /* GEMDOS is less stupid and has no reserved names */ | ||
132 | for (reserved = reserved_names; *reserved; reserved++) | ||
133 | if (!strncmp(res, *reserved, 8)) | ||
134 | return -EINVAL; | ||
135 | return 0; | ||
136 | } | ||
137 | |||
138 | /***** Locates a directory entry. Uses unformatted name. */ | ||
139 | static int msdos_find(struct inode *dir, const unsigned char *name, int len, | ||
140 | struct fat_slot_info *sinfo) | ||
141 | { | ||
142 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); | ||
143 | unsigned char msdos_name[MSDOS_NAME]; | ||
144 | int err; | ||
145 | |||
146 | err = msdos_format_name(name, len, msdos_name, &sbi->options); | ||
147 | if (err) | ||
148 | return -ENOENT; | ||
149 | |||
150 | err = fat_scan(dir, msdos_name, sinfo); | ||
151 | if (!err && sbi->options.dotsOK) { | ||
152 | if (name[0] == '.') { | ||
153 | if (!(sinfo->de->attr & ATTR_HIDDEN)) | ||
154 | err = -ENOENT; | ||
155 | } else { | ||
156 | if (sinfo->de->attr & ATTR_HIDDEN) | ||
157 | err = -ENOENT; | ||
158 | } | ||
159 | if (err) | ||
160 | brelse(sinfo->bh); | ||
161 | } | ||
162 | return err; | ||
163 | } | ||
164 | |||
165 | /* | ||
166 | * Compute the hash for the msdos name corresponding to the dentry. | ||
167 | * Note: if the name is invalid, we leave the hash code unchanged so | ||
168 | * that the existing dentry can be used. The msdos fs routines will | ||
169 | * return ENOENT or EINVAL as appropriate. | ||
170 | */ | ||
171 | static int msdos_hash(struct dentry *dentry, struct qstr *qstr) | ||
172 | { | ||
173 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; | ||
174 | unsigned char msdos_name[MSDOS_NAME]; | ||
175 | int error; | ||
176 | |||
177 | error = msdos_format_name(qstr->name, qstr->len, msdos_name, options); | ||
178 | if (!error) | ||
179 | qstr->hash = full_name_hash(msdos_name, MSDOS_NAME); | ||
180 | return 0; | ||
181 | } | ||
182 | |||
183 | /* | ||
184 | * Compare two msdos names. If either of the names are invalid, | ||
185 | * we fall back to doing the standard name comparison. | ||
186 | */ | ||
187 | static int msdos_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b) | ||
188 | { | ||
189 | struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options; | ||
190 | unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME]; | ||
191 | int error; | ||
192 | |||
193 | error = msdos_format_name(a->name, a->len, a_msdos_name, options); | ||
194 | if (error) | ||
195 | goto old_compare; | ||
196 | error = msdos_format_name(b->name, b->len, b_msdos_name, options); | ||
197 | if (error) | ||
198 | goto old_compare; | ||
199 | error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME); | ||
200 | out: | ||
201 | return error; | ||
202 | |||
203 | old_compare: | ||
204 | error = 1; | ||
205 | if (a->len == b->len) | ||
206 | error = memcmp(a->name, b->name, a->len); | ||
207 | goto out; | ||
208 | } | ||
209 | |||
210 | static struct dentry_operations msdos_dentry_operations = { | ||
211 | .d_hash = msdos_hash, | ||
212 | .d_compare = msdos_cmp, | ||
213 | }; | ||
214 | |||
215 | /* | ||
216 | * AV. Wrappers for FAT sb operations. Is it wise? | ||
217 | */ | ||
218 | |||
219 | /***** Get inode using directory and name */ | ||
220 | static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry, | ||
221 | struct nameidata *nd) | ||
222 | { | ||
223 | struct super_block *sb = dir->i_sb; | ||
224 | struct fat_slot_info sinfo; | ||
225 | struct inode *inode = NULL; | ||
226 | int res; | ||
227 | |||
228 | dentry->d_op = &msdos_dentry_operations; | ||
229 | |||
230 | lock_kernel(); | ||
231 | res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | ||
232 | if (res == -ENOENT) | ||
233 | goto add; | ||
234 | if (res < 0) | ||
235 | goto out; | ||
236 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | ||
237 | brelse(sinfo.bh); | ||
238 | if (IS_ERR(inode)) { | ||
239 | res = PTR_ERR(inode); | ||
240 | goto out; | ||
241 | } | ||
242 | add: | ||
243 | res = 0; | ||
244 | dentry = d_splice_alias(inode, dentry); | ||
245 | if (dentry) | ||
246 | dentry->d_op = &msdos_dentry_operations; | ||
247 | out: | ||
248 | unlock_kernel(); | ||
249 | if (!res) | ||
250 | return dentry; | ||
251 | return ERR_PTR(res); | ||
252 | } | ||
253 | |||
254 | /***** Creates a directory entry (name is already formatted). */ | ||
255 | static int msdos_add_entry(struct inode *dir, const unsigned char *name, | ||
256 | int is_dir, int is_hid, int cluster, | ||
257 | struct timespec *ts, struct fat_slot_info *sinfo) | ||
258 | { | ||
259 | struct msdos_dir_entry de; | ||
260 | __le16 time, date; | ||
261 | int err; | ||
262 | |||
263 | memcpy(de.name, name, MSDOS_NAME); | ||
264 | de.attr = is_dir ? ATTR_DIR : ATTR_ARCH; | ||
265 | if (is_hid) | ||
266 | de.attr |= ATTR_HIDDEN; | ||
267 | de.lcase = 0; | ||
268 | fat_date_unix2dos(ts->tv_sec, &time, &date); | ||
269 | de.cdate = de.adate = 0; | ||
270 | de.ctime = 0; | ||
271 | de.ctime_cs = 0; | ||
272 | de.time = time; | ||
273 | de.date = date; | ||
274 | de.start = cpu_to_le16(cluster); | ||
275 | de.starthi = cpu_to_le16(cluster >> 16); | ||
276 | de.size = 0; | ||
277 | |||
278 | err = fat_add_entries(dir, &de, 1, sinfo); | ||
279 | if (err) | ||
280 | return err; | ||
281 | |||
282 | dir->i_ctime = dir->i_mtime = *ts; | ||
283 | if (IS_DIRSYNC(dir)) | ||
284 | (void)fat_sync_inode(dir); | ||
285 | else | ||
286 | mark_inode_dirty(dir); | ||
287 | |||
288 | return 0; | ||
289 | } | ||
290 | |||
291 | /***** Create a file */ | ||
292 | static int msdos_create(struct inode *dir, struct dentry *dentry, int mode, | ||
293 | struct nameidata *nd) | ||
294 | { | ||
295 | struct super_block *sb = dir->i_sb; | ||
296 | struct inode *inode; | ||
297 | struct fat_slot_info sinfo; | ||
298 | struct timespec ts; | ||
299 | unsigned char msdos_name[MSDOS_NAME]; | ||
300 | int err, is_hid; | ||
301 | |||
302 | lock_kernel(); | ||
303 | |||
304 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | ||
305 | msdos_name, &MSDOS_SB(sb)->options); | ||
306 | if (err) | ||
307 | goto out; | ||
308 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | ||
309 | /* Have to do it due to foo vs. .foo conflicts */ | ||
310 | if (!fat_scan(dir, msdos_name, &sinfo)) { | ||
311 | brelse(sinfo.bh); | ||
312 | err = -EINVAL; | ||
313 | goto out; | ||
314 | } | ||
315 | |||
316 | ts = CURRENT_TIME_SEC; | ||
317 | err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo); | ||
318 | if (err) | ||
319 | goto out; | ||
320 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | ||
321 | brelse(sinfo.bh); | ||
322 | if (IS_ERR(inode)) { | ||
323 | err = PTR_ERR(inode); | ||
324 | goto out; | ||
325 | } | ||
326 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | ||
327 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | ||
328 | |||
329 | d_instantiate(dentry, inode); | ||
330 | out: | ||
331 | unlock_kernel(); | ||
332 | return err; | ||
333 | } | ||
334 | |||
335 | /***** Remove a directory */ | ||
336 | static int msdos_rmdir(struct inode *dir, struct dentry *dentry) | ||
337 | { | ||
338 | struct inode *inode = dentry->d_inode; | ||
339 | struct fat_slot_info sinfo; | ||
340 | int err; | ||
341 | |||
342 | lock_kernel(); | ||
343 | /* | ||
344 | * Check whether the directory is not in use, then check | ||
345 | * whether it is empty. | ||
346 | */ | ||
347 | err = fat_dir_empty(inode); | ||
348 | if (err) | ||
349 | goto out; | ||
350 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | ||
351 | if (err) | ||
352 | goto out; | ||
353 | |||
354 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | ||
355 | if (err) | ||
356 | goto out; | ||
357 | dir->i_nlink--; | ||
358 | |||
359 | inode->i_nlink = 0; | ||
360 | inode->i_ctime = CURRENT_TIME_SEC; | ||
361 | fat_detach(inode); | ||
362 | out: | ||
363 | unlock_kernel(); | ||
364 | |||
365 | return err; | ||
366 | } | ||
367 | |||
368 | /***** Make a directory */ | ||
369 | static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode) | ||
370 | { | ||
371 | struct super_block *sb = dir->i_sb; | ||
372 | struct fat_slot_info sinfo; | ||
373 | struct inode *inode; | ||
374 | unsigned char msdos_name[MSDOS_NAME]; | ||
375 | struct timespec ts; | ||
376 | int err, is_hid, cluster; | ||
377 | |||
378 | lock_kernel(); | ||
379 | |||
380 | err = msdos_format_name(dentry->d_name.name, dentry->d_name.len, | ||
381 | msdos_name, &MSDOS_SB(sb)->options); | ||
382 | if (err) | ||
383 | goto out; | ||
384 | is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.'); | ||
385 | /* foo vs .foo situation */ | ||
386 | if (!fat_scan(dir, msdos_name, &sinfo)) { | ||
387 | brelse(sinfo.bh); | ||
388 | err = -EINVAL; | ||
389 | goto out; | ||
390 | } | ||
391 | |||
392 | ts = CURRENT_TIME_SEC; | ||
393 | cluster = fat_alloc_new_dir(dir, &ts); | ||
394 | if (cluster < 0) { | ||
395 | err = cluster; | ||
396 | goto out; | ||
397 | } | ||
398 | err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo); | ||
399 | if (err) | ||
400 | goto out_free; | ||
401 | dir->i_nlink++; | ||
402 | |||
403 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); | ||
404 | brelse(sinfo.bh); | ||
405 | if (IS_ERR(inode)) { | ||
406 | err = PTR_ERR(inode); | ||
407 | /* the directory was completed, just return a error */ | ||
408 | goto out; | ||
409 | } | ||
410 | inode->i_nlink = 2; | ||
411 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; | ||
412 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ | ||
413 | |||
414 | d_instantiate(dentry, inode); | ||
415 | |||
416 | unlock_kernel(); | ||
417 | return 0; | ||
418 | |||
419 | out_free: | ||
420 | fat_free_clusters(dir, cluster); | ||
421 | out: | ||
422 | unlock_kernel(); | ||
423 | return err; | ||
424 | } | ||
425 | |||
426 | /***** Unlink a file */ | ||
427 | static int msdos_unlink(struct inode *dir, struct dentry *dentry) | ||
428 | { | ||
429 | struct inode *inode = dentry->d_inode; | ||
430 | struct fat_slot_info sinfo; | ||
431 | int err; | ||
432 | |||
433 | lock_kernel(); | ||
434 | err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo); | ||
435 | if (err) | ||
436 | goto out; | ||
437 | |||
438 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ | ||
439 | if (err) | ||
440 | goto out; | ||
441 | inode->i_nlink = 0; | ||
442 | inode->i_ctime = CURRENT_TIME_SEC; | ||
443 | fat_detach(inode); | ||
444 | out: | ||
445 | unlock_kernel(); | ||
446 | |||
447 | return err; | ||
448 | } | ||
449 | |||
450 | static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name, | ||
451 | struct dentry *old_dentry, | ||
452 | struct inode *new_dir, unsigned char *new_name, | ||
453 | struct dentry *new_dentry, int is_hid) | ||
454 | { | ||
455 | struct buffer_head *dotdot_bh; | ||
456 | struct msdos_dir_entry *dotdot_de; | ||
457 | loff_t dotdot_i_pos; | ||
458 | struct inode *old_inode, *new_inode; | ||
459 | struct fat_slot_info old_sinfo, sinfo; | ||
460 | struct timespec ts; | ||
461 | int err, old_attrs, is_dir, update_dotdot, corrupt = 0; | ||
462 | |||
463 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; | ||
464 | old_inode = old_dentry->d_inode; | ||
465 | new_inode = new_dentry->d_inode; | ||
466 | |||
467 | err = fat_scan(old_dir, old_name, &old_sinfo); | ||
468 | if (err) { | ||
469 | err = -EIO; | ||
470 | goto out; | ||
471 | } | ||
472 | |||
473 | is_dir = S_ISDIR(old_inode->i_mode); | ||
474 | update_dotdot = (is_dir && old_dir != new_dir); | ||
475 | if (update_dotdot) { | ||
476 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de, | ||
477 | &dotdot_i_pos) < 0) { | ||
478 | err = -EIO; | ||
479 | goto out; | ||
480 | } | ||
481 | } | ||
482 | |||
483 | old_attrs = MSDOS_I(old_inode)->i_attrs; | ||
484 | err = fat_scan(new_dir, new_name, &sinfo); | ||
485 | if (!err) { | ||
486 | if (!new_inode) { | ||
487 | /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */ | ||
488 | if (sinfo.de != old_sinfo.de) { | ||
489 | err = -EINVAL; | ||
490 | goto out; | ||
491 | } | ||
492 | if (is_hid) | ||
493 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | ||
494 | else | ||
495 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | ||
496 | if (IS_DIRSYNC(old_dir)) { | ||
497 | err = fat_sync_inode(old_inode); | ||
498 | if (err) { | ||
499 | MSDOS_I(old_inode)->i_attrs = old_attrs; | ||
500 | goto out; | ||
501 | } | ||
502 | } else | ||
503 | mark_inode_dirty(old_inode); | ||
504 | |||
505 | old_dir->i_version++; | ||
506 | old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC; | ||
507 | if (IS_DIRSYNC(old_dir)) | ||
508 | (void)fat_sync_inode(old_dir); | ||
509 | else | ||
510 | mark_inode_dirty(old_dir); | ||
511 | goto out; | ||
512 | } | ||
513 | } | ||
514 | |||
515 | ts = CURRENT_TIME_SEC; | ||
516 | if (new_inode) { | ||
517 | if (err) | ||
518 | goto out; | ||
519 | if (MSDOS_I(new_inode)->i_pos != sinfo.i_pos) { | ||
520 | /* WTF??? Cry and fail. */ | ||
521 | printk(KERN_WARNING "msdos_rename: fs corrupted\n"); | ||
522 | goto out; | ||
523 | } | ||
524 | |||
525 | if (is_dir) { | ||
526 | err = fat_dir_empty(new_inode); | ||
527 | if (err) | ||
528 | goto out; | ||
529 | } | ||
530 | fat_detach(new_inode); | ||
531 | } else { | ||
532 | err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0, | ||
533 | &ts, &sinfo); | ||
534 | if (err) | ||
535 | goto out; | ||
536 | } | ||
537 | new_dir->i_version++; | ||
538 | |||
539 | fat_detach(old_inode); | ||
540 | fat_attach(old_inode, sinfo.i_pos); | ||
541 | if (is_hid) | ||
542 | MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN; | ||
543 | else | ||
544 | MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN; | ||
545 | if (IS_DIRSYNC(new_dir)) { | ||
546 | err = fat_sync_inode(old_inode); | ||
547 | if (err) | ||
548 | goto error_inode; | ||
549 | } else | ||
550 | mark_inode_dirty(old_inode); | ||
551 | |||
552 | if (update_dotdot) { | ||
553 | int start = MSDOS_I(new_dir)->i_logstart; | ||
554 | dotdot_de->start = cpu_to_le16(start); | ||
555 | dotdot_de->starthi = cpu_to_le16(start >> 16); | ||
556 | mark_buffer_dirty(dotdot_bh); | ||
557 | if (IS_DIRSYNC(new_dir)) { | ||
558 | err = sync_dirty_buffer(dotdot_bh); | ||
559 | if (err) | ||
560 | goto error_dotdot; | ||
561 | } | ||
562 | old_dir->i_nlink--; | ||
563 | if (!new_inode) | ||
564 | new_dir->i_nlink++; | ||
565 | } | ||
566 | |||
567 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ | ||
568 | old_sinfo.bh = NULL; | ||
569 | if (err) | ||
570 | goto error_dotdot; | ||
571 | old_dir->i_version++; | ||
572 | old_dir->i_ctime = old_dir->i_mtime = ts; | ||
573 | if (IS_DIRSYNC(old_dir)) | ||
574 | (void)fat_sync_inode(old_dir); | ||
575 | else | ||
576 | mark_inode_dirty(old_dir); | ||
577 | |||
578 | if (new_inode) { | ||
579 | if (is_dir) | ||
580 | new_inode->i_nlink -= 2; | ||
581 | else | ||
582 | new_inode->i_nlink--; | ||
583 | new_inode->i_ctime = ts; | ||
584 | } | ||
585 | out: | ||
586 | brelse(sinfo.bh); | ||
587 | brelse(dotdot_bh); | ||
588 | brelse(old_sinfo.bh); | ||
589 | return err; | ||
590 | |||
591 | error_dotdot: | ||
592 | /* data cluster is shared, serious corruption */ | ||
593 | corrupt = 1; | ||
594 | |||
595 | if (update_dotdot) { | ||
596 | int start = MSDOS_I(old_dir)->i_logstart; | ||
597 | dotdot_de->start = cpu_to_le16(start); | ||
598 | dotdot_de->starthi = cpu_to_le16(start >> 16); | ||
599 | mark_buffer_dirty(dotdot_bh); | ||
600 | corrupt |= sync_dirty_buffer(dotdot_bh); | ||
601 | } | ||
602 | error_inode: | ||
603 | fat_detach(old_inode); | ||
604 | fat_attach(old_inode, old_sinfo.i_pos); | ||
605 | MSDOS_I(old_inode)->i_attrs = old_attrs; | ||
606 | if (new_inode) { | ||
607 | fat_attach(new_inode, sinfo.i_pos); | ||
608 | if (corrupt) | ||
609 | corrupt |= fat_sync_inode(new_inode); | ||
610 | } else { | ||
611 | /* | ||
612 | * If new entry was not sharing the data cluster, it | ||
613 | * shouldn't be serious corruption. | ||
614 | */ | ||
615 | int err2 = fat_remove_entries(new_dir, &sinfo); | ||
616 | if (corrupt) | ||
617 | corrupt |= err2; | ||
618 | sinfo.bh = NULL; | ||
619 | } | ||
620 | if (corrupt < 0) { | ||
621 | fat_fs_panic(new_dir->i_sb, | ||
622 | "%s: Filesystem corrupted (i_pos %lld)", | ||
623 | __FUNCTION__, sinfo.i_pos); | ||
624 | } | ||
625 | goto out; | ||
626 | } | ||
627 | |||
628 | /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */ | ||
629 | static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry, | ||
630 | struct inode *new_dir, struct dentry *new_dentry) | ||
631 | { | ||
632 | unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME]; | ||
633 | int err, is_hid; | ||
634 | |||
635 | lock_kernel(); | ||
636 | |||
637 | err = msdos_format_name(old_dentry->d_name.name, | ||
638 | old_dentry->d_name.len, old_msdos_name, | ||
639 | &MSDOS_SB(old_dir->i_sb)->options); | ||
640 | if (err) | ||
641 | goto out; | ||
642 | err = msdos_format_name(new_dentry->d_name.name, | ||
643 | new_dentry->d_name.len, new_msdos_name, | ||
644 | &MSDOS_SB(new_dir->i_sb)->options); | ||
645 | if (err) | ||
646 | goto out; | ||
647 | |||
648 | is_hid = | ||
649 | (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.'); | ||
650 | |||
651 | err = do_msdos_rename(old_dir, old_msdos_name, old_dentry, | ||
652 | new_dir, new_msdos_name, new_dentry, is_hid); | ||
653 | out: | ||
654 | unlock_kernel(); | ||
655 | return err; | ||
656 | } | ||
657 | |||
658 | static struct inode_operations msdos_dir_inode_operations = { | ||
659 | .create = msdos_create, | ||
660 | .lookup = msdos_lookup, | ||
661 | .unlink = msdos_unlink, | ||
662 | .mkdir = msdos_mkdir, | ||
663 | .rmdir = msdos_rmdir, | ||
664 | .rename = msdos_rename, | ||
665 | .setattr = fat_notify_change, | ||
666 | }; | ||
667 | |||
668 | static int msdos_fill_super(struct super_block *sb, void *data, int silent) | ||
669 | { | ||
670 | int res; | ||
671 | |||
672 | res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0); | ||
673 | if (res) | ||
674 | return res; | ||
675 | |||
676 | sb->s_flags |= MS_NOATIME; | ||
677 | sb->s_root->d_op = &msdos_dentry_operations; | ||
678 | return 0; | ||
679 | } | ||
680 | |||
681 | static struct super_block *msdos_get_sb(struct file_system_type *fs_type, | ||
682 | int flags, const char *dev_name, | ||
683 | void *data) | ||
684 | { | ||
685 | return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super); | ||
686 | } | ||
687 | |||
688 | static struct file_system_type msdos_fs_type = { | ||
689 | .owner = THIS_MODULE, | ||
690 | .name = "msdos", | ||
691 | .get_sb = msdos_get_sb, | ||
692 | .kill_sb = kill_block_super, | ||
693 | .fs_flags = FS_REQUIRES_DEV, | ||
694 | }; | ||
695 | |||
696 | static int __init init_msdos_fs(void) | ||
697 | { | ||
698 | return register_filesystem(&msdos_fs_type); | ||
699 | } | ||
700 | |||
701 | static void __exit exit_msdos_fs(void) | ||
702 | { | ||
703 | unregister_filesystem(&msdos_fs_type); | ||
704 | } | ||
705 | |||
706 | MODULE_LICENSE("GPL"); | ||
707 | MODULE_AUTHOR("Werner Almesberger"); | ||
708 | MODULE_DESCRIPTION("MS-DOS filesystem support"); | ||
709 | |||
710 | module_init(init_msdos_fs) | ||
711 | module_exit(exit_msdos_fs) | ||