blob: 1f7f2956412ac9527be5867aa5c5bca8ecc81db6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070015/* Characters that are undesirable in an MS-DOS file name */
16static unsigned char bad_chars[] = "*?<>|\"";
17static unsigned char bad_if_strict_pc[] = "+=,; ";
18/* GEMDOS is less restrictive */
19static unsigned char bad_if_strict_atari[] = " ";
20
21#define bad_if_strict(opts) \
22 ((opts)->atari ? bad_if_strict_atari : bad_if_strict_pc)
23
24/***** Formats an MS-DOS file name. Rejects invalid names. */
25static int msdos_format_name(const unsigned char *name, int len,
26 unsigned char *res, struct fat_mount_options *opts)
27 /*
28 * name is the proposed name, len is its length, res is
29 * the resulting name, opts->name_check is either (r)elaxed,
30 * (n)ormal or (s)trict, opts->dotsOK allows dots at the
31 * beginning of name (for hidden files)
32 */
33{
34 unsigned char *walk;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 unsigned char c;
36 int space;
37
38 if (name[0] == '.') { /* dotfile because . and .. already done */
39 if (opts->dotsOK) {
40 /* Get rid of dot - test for it elsewhere */
41 name++;
42 len--;
43 } else if (!opts->atari)
44 return -EINVAL;
45 }
46 /*
47 * disallow names that _really_ start with a dot for MS-DOS,
48 * GEMDOS does not care
49 */
50 space = !opts->atari;
51 c = 0;
52 for (walk = res; len && walk - res < 8; walk++) {
53 c = *name++;
54 len--;
55 if (opts->name_check != 'r' && strchr(bad_chars, c))
56 return -EINVAL;
57 if (opts->name_check == 's' && strchr(bad_if_strict(opts), c))
58 return -EINVAL;
59 if (c >= 'A' && c <= 'Z' && opts->name_check == 's')
60 return -EINVAL;
61 if (c < ' ' || c == ':' || c == '\\')
62 return -EINVAL;
63 /*
64 * 0xE5 is legal as a first character, but we must substitute
65 * 0x05 because 0xE5 marks deleted files. Yes, DOS really
66 * does this.
67 * It seems that Microsoft hacked DOS to support non-US
68 * characters after the 0xE5 character was already in use to
69 * mark deleted files.
70 */
71 if ((res == walk) && (c == 0xE5))
72 c = 0x05;
73 if (c == '.')
74 break;
75 space = (c == ' ');
76 *walk = (!opts->nocase && c >= 'a' && c <= 'z') ? c - 32 : c;
77 }
78 if (space)
79 return -EINVAL;
80 if (opts->name_check == 's' && len && c != '.') {
81 c = *name++;
82 len--;
83 if (c != '.')
84 return -EINVAL;
85 }
86 while (c != '.' && len--)
87 c = *name++;
88 if (c == '.') {
89 while (walk - res < 8)
90 *walk++ = ' ';
91 while (len > 0 && walk - res < MSDOS_NAME) {
92 c = *name++;
93 len--;
94 if (opts->name_check != 'r' && strchr(bad_chars, c))
95 return -EINVAL;
96 if (opts->name_check == 's' &&
97 strchr(bad_if_strict(opts), c))
98 return -EINVAL;
99 if (c < ' ' || c == ':' || c == '\\')
100 return -EINVAL;
101 if (c == '.') {
102 if (opts->name_check == 's')
103 return -EINVAL;
104 break;
105 }
106 if (c >= 'A' && c <= 'Z' && opts->name_check == 's')
107 return -EINVAL;
108 space = c == ' ';
109 if (!opts->nocase && c >= 'a' && c <= 'z')
110 *walk++ = c - 32;
111 else
112 *walk++ = c;
113 }
114 if (space)
115 return -EINVAL;
116 if (opts->name_check == 's' && len)
117 return -EINVAL;
118 }
119 while (walk - res < MSDOS_NAME)
120 *walk++ = ' ';
OGAWA Hirofumi094e3202006-03-31 02:30:53 -0800121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 return 0;
123}
124
125/***** Locates a directory entry. Uses unformatted name. */
126static int msdos_find(struct inode *dir, const unsigned char *name, int len,
127 struct fat_slot_info *sinfo)
128{
129 struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
130 unsigned char msdos_name[MSDOS_NAME];
131 int err;
132
133 err = msdos_format_name(name, len, msdos_name, &sbi->options);
134 if (err)
135 return -ENOENT;
136
137 err = fat_scan(dir, msdos_name, sinfo);
138 if (!err && sbi->options.dotsOK) {
139 if (name[0] == '.') {
140 if (!(sinfo->de->attr & ATTR_HIDDEN))
141 err = -ENOENT;
142 } else {
143 if (sinfo->de->attr & ATTR_HIDDEN)
144 err = -ENOENT;
145 }
146 if (err)
147 brelse(sinfo->bh);
148 }
149 return err;
150}
151
152/*
153 * Compute the hash for the msdos name corresponding to the dentry.
154 * Note: if the name is invalid, we leave the hash code unchanged so
155 * that the existing dentry can be used. The msdos fs routines will
156 * return ENOENT or EINVAL as appropriate.
157 */
158static int msdos_hash(struct dentry *dentry, struct qstr *qstr)
159{
160 struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
161 unsigned char msdos_name[MSDOS_NAME];
162 int error;
163
164 error = msdos_format_name(qstr->name, qstr->len, msdos_name, options);
165 if (!error)
166 qstr->hash = full_name_hash(msdos_name, MSDOS_NAME);
167 return 0;
168}
169
170/*
171 * Compare two msdos names. If either of the names are invalid,
172 * we fall back to doing the standard name comparison.
173 */
174static int msdos_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b)
175{
176 struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
177 unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME];
178 int error;
179
180 error = msdos_format_name(a->name, a->len, a_msdos_name, options);
181 if (error)
182 goto old_compare;
183 error = msdos_format_name(b->name, b->len, b_msdos_name, options);
184 if (error)
185 goto old_compare;
186 error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME);
187out:
188 return error;
189
190old_compare:
191 error = 1;
192 if (a->len == b->len)
193 error = memcmp(a->name, b->name, a->len);
194 goto out;
195}
196
197static struct dentry_operations msdos_dentry_operations = {
198 .d_hash = msdos_hash,
199 .d_compare = msdos_cmp,
200};
201
202/*
203 * AV. Wrappers for FAT sb operations. Is it wise?
204 */
205
206/***** Get inode using directory and name */
207static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
208 struct nameidata *nd)
209{
210 struct super_block *sb = dir->i_sb;
211 struct fat_slot_info sinfo;
212 struct inode *inode = NULL;
213 int res;
214
215 dentry->d_op = &msdos_dentry_operations;
216
Linus Torvalds8f593422008-05-19 19:53:01 -0700217 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
219 if (res == -ENOENT)
220 goto add;
221 if (res < 0)
222 goto out;
223 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
224 brelse(sinfo.bh);
225 if (IS_ERR(inode)) {
226 res = PTR_ERR(inode);
227 goto out;
228 }
229add:
230 res = 0;
231 dentry = d_splice_alias(inode, dentry);
232 if (dentry)
233 dentry->d_op = &msdos_dentry_operations;
234out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700235 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 if (!res)
237 return dentry;
238 return ERR_PTR(res);
239}
240
241/***** Creates a directory entry (name is already formatted). */
242static int msdos_add_entry(struct inode *dir, const unsigned char *name,
243 int is_dir, int is_hid, int cluster,
244 struct timespec *ts, struct fat_slot_info *sinfo)
245{
246 struct msdos_dir_entry de;
247 __le16 time, date;
248 int err;
249
250 memcpy(de.name, name, MSDOS_NAME);
251 de.attr = is_dir ? ATTR_DIR : ATTR_ARCH;
252 if (is_hid)
253 de.attr |= ATTR_HIDDEN;
254 de.lcase = 0;
255 fat_date_unix2dos(ts->tv_sec, &time, &date);
256 de.cdate = de.adate = 0;
257 de.ctime = 0;
258 de.ctime_cs = 0;
259 de.time = time;
260 de.date = date;
261 de.start = cpu_to_le16(cluster);
262 de.starthi = cpu_to_le16(cluster >> 16);
263 de.size = 0;
264
265 err = fat_add_entries(dir, &de, 1, sinfo);
266 if (err)
267 return err;
268
269 dir->i_ctime = dir->i_mtime = *ts;
270 if (IS_DIRSYNC(dir))
271 (void)fat_sync_inode(dir);
272 else
273 mark_inode_dirty(dir);
274
275 return 0;
276}
277
278/***** Create a file */
279static int msdos_create(struct inode *dir, struct dentry *dentry, int mode,
280 struct nameidata *nd)
281{
282 struct super_block *sb = dir->i_sb;
Chris Masonae78bf92006-09-29 02:00:03 -0700283 struct inode *inode = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 struct fat_slot_info sinfo;
285 struct timespec ts;
286 unsigned char msdos_name[MSDOS_NAME];
287 int err, is_hid;
288
Linus Torvalds8f593422008-05-19 19:53:01 -0700289 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
291 err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
292 msdos_name, &MSDOS_SB(sb)->options);
293 if (err)
294 goto out;
295 is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
296 /* Have to do it due to foo vs. .foo conflicts */
297 if (!fat_scan(dir, msdos_name, &sinfo)) {
298 brelse(sinfo.bh);
299 err = -EINVAL;
300 goto out;
301 }
302
303 ts = CURRENT_TIME_SEC;
304 err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo);
305 if (err)
306 goto out;
307 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
308 brelse(sinfo.bh);
309 if (IS_ERR(inode)) {
310 err = PTR_ERR(inode);
311 goto out;
312 }
313 inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
314 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
315
316 d_instantiate(dentry, inode);
317out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700318 unlock_super(sb);
Chris Masonae78bf92006-09-29 02:00:03 -0700319 if (!err)
320 err = fat_flush_inodes(sb, dir, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 return err;
322}
323
324/***** Remove a directory */
325static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
326{
Linus Torvalds8f593422008-05-19 19:53:01 -0700327 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 struct inode *inode = dentry->d_inode;
329 struct fat_slot_info sinfo;
330 int err;
331
Linus Torvalds8f593422008-05-19 19:53:01 -0700332 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 /*
334 * Check whether the directory is not in use, then check
335 * whether it is empty.
336 */
337 err = fat_dir_empty(inode);
338 if (err)
339 goto out;
340 err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
341 if (err)
342 goto out;
343
344 err = fat_remove_entries(dir, &sinfo); /* and releases bh */
345 if (err)
346 goto out;
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700347 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
Dave Hansence71ec32006-09-30 23:29:06 -0700349 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 inode->i_ctime = CURRENT_TIME_SEC;
351 fat_detach(inode);
352out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700353 unlock_super(sb);
Chris Masonae78bf92006-09-29 02:00:03 -0700354 if (!err)
Linus Torvalds8f593422008-05-19 19:53:01 -0700355 err = fat_flush_inodes(sb, dir, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
357 return err;
358}
359
360/***** Make a directory */
361static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode)
362{
363 struct super_block *sb = dir->i_sb;
364 struct fat_slot_info sinfo;
365 struct inode *inode;
366 unsigned char msdos_name[MSDOS_NAME];
367 struct timespec ts;
368 int err, is_hid, cluster;
369
Linus Torvalds8f593422008-05-19 19:53:01 -0700370 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372 err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
373 msdos_name, &MSDOS_SB(sb)->options);
374 if (err)
375 goto out;
376 is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
377 /* foo vs .foo situation */
378 if (!fat_scan(dir, msdos_name, &sinfo)) {
379 brelse(sinfo.bh);
380 err = -EINVAL;
381 goto out;
382 }
383
384 ts = CURRENT_TIME_SEC;
385 cluster = fat_alloc_new_dir(dir, &ts);
386 if (cluster < 0) {
387 err = cluster;
388 goto out;
389 }
390 err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo);
391 if (err)
392 goto out_free;
Dave Hansend8c76e62006-09-30 23:29:04 -0700393 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
395 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
396 brelse(sinfo.bh);
397 if (IS_ERR(inode)) {
398 err = PTR_ERR(inode);
399 /* the directory was completed, just return a error */
400 goto out;
401 }
402 inode->i_nlink = 2;
403 inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
404 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
405
406 d_instantiate(dentry, inode);
407
Linus Torvalds8f593422008-05-19 19:53:01 -0700408 unlock_super(sb);
Chris Masonae78bf92006-09-29 02:00:03 -0700409 fat_flush_inodes(sb, dir, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 return 0;
411
412out_free:
413 fat_free_clusters(dir, cluster);
414out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700415 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 return err;
417}
418
419/***** Unlink a file */
420static int msdos_unlink(struct inode *dir, struct dentry *dentry)
421{
422 struct inode *inode = dentry->d_inode;
Linus Torvalds8f593422008-05-19 19:53:01 -0700423 struct super_block *sb= inode->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 struct fat_slot_info sinfo;
425 int err;
426
Linus Torvalds8f593422008-05-19 19:53:01 -0700427 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
429 if (err)
430 goto out;
431
432 err = fat_remove_entries(dir, &sinfo); /* and releases bh */
433 if (err)
434 goto out;
Dave Hansence71ec32006-09-30 23:29:06 -0700435 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 inode->i_ctime = CURRENT_TIME_SEC;
437 fat_detach(inode);
438out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700439 unlock_super(sb);
Chris Masonae78bf92006-09-29 02:00:03 -0700440 if (!err)
Linus Torvalds8f593422008-05-19 19:53:01 -0700441 err = fat_flush_inodes(sb, dir, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443 return err;
444}
445
446static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
447 struct dentry *old_dentry,
448 struct inode *new_dir, unsigned char *new_name,
449 struct dentry *new_dentry, int is_hid)
450{
451 struct buffer_head *dotdot_bh;
452 struct msdos_dir_entry *dotdot_de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 struct inode *old_inode, *new_inode;
454 struct fat_slot_info old_sinfo, sinfo;
455 struct timespec ts;
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800456 loff_t dotdot_i_pos, new_i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 int err, old_attrs, is_dir, update_dotdot, corrupt = 0;
458
459 old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
460 old_inode = old_dentry->d_inode;
461 new_inode = new_dentry->d_inode;
462
463 err = fat_scan(old_dir, old_name, &old_sinfo);
464 if (err) {
465 err = -EIO;
466 goto out;
467 }
468
469 is_dir = S_ISDIR(old_inode->i_mode);
470 update_dotdot = (is_dir && old_dir != new_dir);
471 if (update_dotdot) {
472 if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de,
473 &dotdot_i_pos) < 0) {
474 err = -EIO;
475 goto out;
476 }
477 }
478
479 old_attrs = MSDOS_I(old_inode)->i_attrs;
480 err = fat_scan(new_dir, new_name, &sinfo);
481 if (!err) {
482 if (!new_inode) {
483 /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */
484 if (sinfo.de != old_sinfo.de) {
485 err = -EINVAL;
486 goto out;
487 }
488 if (is_hid)
489 MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
490 else
491 MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
492 if (IS_DIRSYNC(old_dir)) {
493 err = fat_sync_inode(old_inode);
494 if (err) {
495 MSDOS_I(old_inode)->i_attrs = old_attrs;
496 goto out;
497 }
498 } else
499 mark_inode_dirty(old_inode);
500
501 old_dir->i_version++;
502 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
503 if (IS_DIRSYNC(old_dir))
504 (void)fat_sync_inode(old_dir);
505 else
506 mark_inode_dirty(old_dir);
507 goto out;
508 }
509 }
510
511 ts = CURRENT_TIME_SEC;
512 if (new_inode) {
513 if (err)
514 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 if (is_dir) {
516 err = fat_dir_empty(new_inode);
517 if (err)
518 goto out;
519 }
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800520 new_i_pos = MSDOS_I(new_inode)->i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 fat_detach(new_inode);
522 } else {
523 err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0,
524 &ts, &sinfo);
525 if (err)
526 goto out;
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800527 new_i_pos = sinfo.i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 }
529 new_dir->i_version++;
530
531 fat_detach(old_inode);
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800532 fat_attach(old_inode, new_i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 if (is_hid)
534 MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
535 else
536 MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
537 if (IS_DIRSYNC(new_dir)) {
538 err = fat_sync_inode(old_inode);
539 if (err)
540 goto error_inode;
541 } else
542 mark_inode_dirty(old_inode);
543
544 if (update_dotdot) {
545 int start = MSDOS_I(new_dir)->i_logstart;
546 dotdot_de->start = cpu_to_le16(start);
547 dotdot_de->starthi = cpu_to_le16(start >> 16);
548 mark_buffer_dirty(dotdot_bh);
549 if (IS_DIRSYNC(new_dir)) {
550 err = sync_dirty_buffer(dotdot_bh);
551 if (err)
552 goto error_dotdot;
553 }
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700554 drop_nlink(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 if (!new_inode)
Dave Hansend8c76e62006-09-30 23:29:04 -0700556 inc_nlink(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 }
558
559 err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */
560 old_sinfo.bh = NULL;
561 if (err)
562 goto error_dotdot;
563 old_dir->i_version++;
564 old_dir->i_ctime = old_dir->i_mtime = ts;
565 if (IS_DIRSYNC(old_dir))
566 (void)fat_sync_inode(old_dir);
567 else
568 mark_inode_dirty(old_dir);
569
570 if (new_inode) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700571 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 if (is_dir)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700573 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 new_inode->i_ctime = ts;
575 }
576out:
577 brelse(sinfo.bh);
578 brelse(dotdot_bh);
579 brelse(old_sinfo.bh);
580 return err;
581
582error_dotdot:
583 /* data cluster is shared, serious corruption */
584 corrupt = 1;
585
586 if (update_dotdot) {
587 int start = MSDOS_I(old_dir)->i_logstart;
588 dotdot_de->start = cpu_to_le16(start);
589 dotdot_de->starthi = cpu_to_le16(start >> 16);
590 mark_buffer_dirty(dotdot_bh);
591 corrupt |= sync_dirty_buffer(dotdot_bh);
592 }
593error_inode:
594 fat_detach(old_inode);
595 fat_attach(old_inode, old_sinfo.i_pos);
596 MSDOS_I(old_inode)->i_attrs = old_attrs;
597 if (new_inode) {
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800598 fat_attach(new_inode, new_i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 if (corrupt)
600 corrupt |= fat_sync_inode(new_inode);
601 } else {
602 /*
603 * If new entry was not sharing the data cluster, it
604 * shouldn't be serious corruption.
605 */
606 int err2 = fat_remove_entries(new_dir, &sinfo);
607 if (corrupt)
608 corrupt |= err2;
609 sinfo.bh = NULL;
610 }
611 if (corrupt < 0) {
612 fat_fs_panic(new_dir->i_sb,
613 "%s: Filesystem corrupted (i_pos %lld)",
Harvey Harrison8e24eea2008-04-30 00:55:09 -0700614 __func__, sinfo.i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 }
616 goto out;
617}
618
619/***** Rename, a wrapper for rename_same_dir & rename_diff_dir */
620static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
621 struct inode *new_dir, struct dentry *new_dentry)
622{
Linus Torvalds8f593422008-05-19 19:53:01 -0700623 struct super_block *sb = old_dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
625 int err, is_hid;
626
Linus Torvalds8f593422008-05-19 19:53:01 -0700627 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628
629 err = msdos_format_name(old_dentry->d_name.name,
630 old_dentry->d_name.len, old_msdos_name,
631 &MSDOS_SB(old_dir->i_sb)->options);
632 if (err)
633 goto out;
634 err = msdos_format_name(new_dentry->d_name.name,
635 new_dentry->d_name.len, new_msdos_name,
636 &MSDOS_SB(new_dir->i_sb)->options);
637 if (err)
638 goto out;
639
640 is_hid =
641 (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.');
642
643 err = do_msdos_rename(old_dir, old_msdos_name, old_dentry,
644 new_dir, new_msdos_name, new_dentry, is_hid);
645out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700646 unlock_super(sb);
Chris Masonae78bf92006-09-29 02:00:03 -0700647 if (!err)
Linus Torvalds8f593422008-05-19 19:53:01 -0700648 err = fat_flush_inodes(sb, old_dir, new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 return err;
650}
651
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800652static const struct inode_operations msdos_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 .create = msdos_create,
654 .lookup = msdos_lookup,
655 .unlink = msdos_unlink,
656 .mkdir = msdos_mkdir,
657 .rmdir = msdos_rmdir,
658 .rename = msdos_rename,
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700659 .setattr = fat_setattr,
OGAWA Hirofumida63fc72006-11-16 01:19:28 -0800660 .getattr = fat_getattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661};
662
663static int msdos_fill_super(struct super_block *sb, void *data, int silent)
664{
665 int res;
666
667 res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0);
668 if (res)
669 return res;
670
671 sb->s_flags |= MS_NOATIME;
672 sb->s_root->d_op = &msdos_dentry_operations;
673 return 0;
674}
675
David Howells454e2392006-06-23 02:02:57 -0700676static int msdos_get_sb(struct file_system_type *fs_type,
677 int flags, const char *dev_name,
678 void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
David Howells454e2392006-06-23 02:02:57 -0700680 return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super,
681 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682}
683
684static struct file_system_type msdos_fs_type = {
685 .owner = THIS_MODULE,
686 .name = "msdos",
687 .get_sb = msdos_get_sb,
688 .kill_sb = kill_block_super,
689 .fs_flags = FS_REQUIRES_DEV,
690};
691
692static int __init init_msdos_fs(void)
693{
694 return register_filesystem(&msdos_fs_type);
695}
696
697static void __exit exit_msdos_fs(void)
698{
699 unregister_filesystem(&msdos_fs_type);
700}
701
702MODULE_LICENSE("GPL");
703MODULE_AUTHOR("Werner Almesberger");
704MODULE_DESCRIPTION("MS-DOS filesystem support");
705
706module_init(init_msdos_fs)
707module_exit(exit_msdos_fs)