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TOMOYO Linux Cross Reference
Linux/fs/fat/namei_msdos.c

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  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/iversion.h>
 11 #include "fat.h"
 12 
 13 /* Characters that are undesirable in an MS-DOS file name */
 14 static unsigned char bad_chars[] = "*?<>|\"";
 15 static unsigned char bad_if_strict[] = "+=,; ";
 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;
 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--;
 36                 } else
 37                         return -EINVAL;
 38         }
 39         /*
 40          * disallow names that _really_ start with a dot
 41          */
 42         space = 1;
 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;
 49                 if (opts->name_check == 's' && strchr(bad_if_strict, c))
 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' &&
 89                             strchr(bad_if_strict, c))
 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++ = ' ';
113 
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  */
150 static int msdos_hash(const struct dentry *dentry, struct qstr *qstr)
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)
158                 qstr->hash = full_name_hash(dentry, msdos_name, MSDOS_NAME);
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  */
166 static int msdos_cmp(const struct dentry *dentry,
167                 unsigned int len, const char *str, const struct qstr *name)
168 {
169         struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
170         unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME];
171         int error;
172 
173         error = msdos_format_name(name->name, name->len, a_msdos_name, options);
174         if (error)
175                 goto old_compare;
176         error = msdos_format_name(str, len, b_msdos_name, options);
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;
185         if (name->len == len)
186                 error = memcmp(name->name, str, len);
187         goto out;
188 }
189 
190 static const struct dentry_operations msdos_dentry_operations = {
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,
201                                    unsigned int flags)
202 {
203         struct super_block *sb = dir->i_sb;
204         struct fat_slot_info sinfo;
205         struct inode *inode;
206         int err;
207 
208         mutex_lock(&MSDOS_SB(sb)->s_lock);
209         err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
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);
220         }
221         mutex_unlock(&MSDOS_SB(sb)->s_lock);
222         return d_splice_alias(inode, dentry);
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 {
230         struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
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;
240         fat_time_unix2fat(sbi, ts, &time, &date, NULL);
241         de.cdate = de.adate = 0;
242         de.ctime = 0;
243         de.ctime_cs = 0;
244         de.time = time;
245         de.date = date;
246         fat_set_start(&de, cluster);
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 */
263 static int msdos_create(struct inode *dir, struct dentry *dentry, umode_t mode,
264                         bool excl)
265 {
266         struct super_block *sb = dir->i_sb;
267         struct inode *inode = NULL;
268         struct fat_slot_info sinfo;
269         struct timespec ts;
270         unsigned char msdos_name[MSDOS_NAME];
271         int err, is_hid;
272 
273         mutex_lock(&MSDOS_SB(sb)->s_lock);
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 
287         ts = current_time(dir);
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:
302         mutex_unlock(&MSDOS_SB(sb)->s_lock);
303         if (!err)
304                 err = fat_flush_inodes(sb, dir, inode);
305         return err;
306 }
307 
308 /***** Remove a directory */
309 static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
310 {
311         struct super_block *sb = dir->i_sb;
312         struct inode *inode = d_inode(dentry);
313         struct fat_slot_info sinfo;
314         int err;
315 
316         mutex_lock(&MSDOS_SB(sb)->s_lock);
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;
331         drop_nlink(dir);
332 
333         clear_nlink(inode);
334         inode->i_ctime = current_time(inode);
335         fat_detach(inode);
336 out:
337         mutex_unlock(&MSDOS_SB(sb)->s_lock);
338         if (!err)
339                 err = fat_flush_inodes(sb, dir, inode);
340 
341         return err;
342 }
343 
344 /***** Make a directory */
345 static int msdos_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
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 
354         mutex_lock(&MSDOS_SB(sb)->s_lock);
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 
368         ts = current_time(dir);
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;
377         inc_nlink(dir);
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         }
386         set_nlink(inode, 2);
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 
392         mutex_unlock(&MSDOS_SB(sb)->s_lock);
393         fat_flush_inodes(sb, dir, inode);
394         return 0;
395 
396 out_free:
397         fat_free_clusters(dir, cluster);
398 out:
399         mutex_unlock(&MSDOS_SB(sb)->s_lock);
400         return err;
401 }
402 
403 /***** Unlink a file */
404 static int msdos_unlink(struct inode *dir, struct dentry *dentry)
405 {
406         struct inode *inode = d_inode(dentry);
407         struct super_block *sb = inode->i_sb;
408         struct fat_slot_info sinfo;
409         int err;
410 
411         mutex_lock(&MSDOS_SB(sb)->s_lock);
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;
419         clear_nlink(inode);
420         inode->i_ctime = current_time(inode);
421         fat_detach(inode);
422 out:
423         mutex_unlock(&MSDOS_SB(sb)->s_lock);
424         if (!err)
425                 err = fat_flush_inodes(sb, dir, inode);
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;
437         struct inode *old_inode, *new_inode;
438         struct fat_slot_info old_sinfo, sinfo;
439         struct timespec ts;
440         loff_t new_i_pos;
441         int err, old_attrs, is_dir, update_dotdot, corrupt = 0;
442 
443         old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
444         old_inode = d_inode(old_dentry);
445         new_inode = d_inode(new_dentry);
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) {
456                 if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) {
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 
484                         inode_inc_iversion(old_dir);
485                         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
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 
494         ts = current_time(old_inode);
495         if (new_inode) {
496                 if (err)
497                         goto out;
498                 if (is_dir) {
499                         err = fat_dir_empty(new_inode);
500                         if (err)
501                                 goto out;
502                 }
503                 new_i_pos = MSDOS_I(new_inode)->i_pos;
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;
510                 new_i_pos = sinfo.i_pos;
511         }
512         inode_inc_iversion(new_dir);
513 
514         fat_detach(old_inode);
515         fat_attach(old_inode, new_i_pos);
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) {
528                 fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart);
529                 mark_buffer_dirty_inode(dotdot_bh, old_inode);
530                 if (IS_DIRSYNC(new_dir)) {
531                         err = sync_dirty_buffer(dotdot_bh);
532                         if (err)
533                                 goto error_dotdot;
534                 }
535                 drop_nlink(old_dir);
536                 if (!new_inode)
537                         inc_nlink(new_dir);
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;
544         inode_inc_iversion(old_dir);
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) {
552                 drop_nlink(new_inode);
553                 if (is_dir)
554                         drop_nlink(new_inode);
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) {
568                 fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart);
569                 mark_buffer_dirty_inode(dotdot_bh, old_inode);
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) {
577                 fat_attach(new_inode, new_i_pos);
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) {
591                 fat_fs_error(new_dir->i_sb,
592                              "%s: Filesystem corrupted (i_pos %lld)",
593                              __func__, sinfo.i_pos);
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,
600                         struct inode *new_dir, struct dentry *new_dentry,
601                         unsigned int flags)
602 {
603         struct super_block *sb = old_dir->i_sb;
604         unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
605         int err, is_hid;
606 
607         if (flags & ~RENAME_NOREPLACE)
608                 return -EINVAL;
609 
610         mutex_lock(&MSDOS_SB(sb)->s_lock);
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:
629         mutex_unlock(&MSDOS_SB(sb)->s_lock);
630         if (!err)
631                 err = fat_flush_inodes(sb, old_dir, new_dir);
632         return err;
633 }
634 
635 static const struct inode_operations msdos_dir_inode_operations = {
636         .create         = msdos_create,
637         .lookup         = msdos_lookup,
638         .unlink         = msdos_unlink,
639         .mkdir          = msdos_mkdir,
640         .rmdir          = msdos_rmdir,
641         .rename         = msdos_rename,
642         .setattr        = fat_setattr,
643         .getattr        = fat_getattr,
644 };
645 
646 static void setup(struct super_block *sb)
647 {
648         MSDOS_SB(sb)->dir_ops = &msdos_dir_inode_operations;
649         sb->s_d_op = &msdos_dentry_operations;
650         sb->s_flags |= SB_NOATIME;
651 }
652 
653 static int msdos_fill_super(struct super_block *sb, void *data, int silent)
654 {
655         return fat_fill_super(sb, data, silent, 0, setup);
656 }
657 
658 static struct dentry *msdos_mount(struct file_system_type *fs_type,
659                         int flags, const char *dev_name,
660                         void *data)
661 {
662         return mount_bdev(fs_type, flags, dev_name, data, msdos_fill_super);
663 }
664 
665 static struct file_system_type msdos_fs_type = {
666         .owner          = THIS_MODULE,
667         .name           = "msdos",
668         .mount          = msdos_mount,
669         .kill_sb        = kill_block_super,
670         .fs_flags       = FS_REQUIRES_DEV,
671 };
672 MODULE_ALIAS_FS("msdos");
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)
690 

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