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

Version: ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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/time.h>
 11 #include <linux/buffer_head.h>
 12 #include "fat.h"
 13 
 14 /* Characters that are undesirable in an MS-DOS file name */
 15 static unsigned char bad_chars[] = "*?<>|\"";
 16 static unsigned char bad_if_strict[] = "+=,; ";
 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;
 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--;
 37                 } else
 38                         return -EINVAL;
 39         }
 40         /*
 41          * disallow names that _really_ start with a dot
 42          */
 43         space = 1;
 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;
 50                 if (opts->name_check == 's' && strchr(bad_if_strict, c))
 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' &&
 90                             strchr(bad_if_strict, c))
 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++ = ' ';
114 
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  */
151 static int msdos_hash(const struct dentry *dentry, const struct inode *inode,
152                struct qstr *qstr)
153 {
154         struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
155         unsigned char msdos_name[MSDOS_NAME];
156         int error;
157 
158         error = msdos_format_name(qstr->name, qstr->len, msdos_name, options);
159         if (!error)
160                 qstr->hash = full_name_hash(msdos_name, MSDOS_NAME);
161         return 0;
162 }
163 
164 /*
165  * Compare two msdos names. If either of the names are invalid,
166  * we fall back to doing the standard name comparison.
167  */
168 static int msdos_cmp(const struct dentry *parent, const struct inode *pinode,
169                 const struct dentry *dentry, const struct inode *inode,
170                 unsigned int len, const char *str, const struct qstr *name)
171 {
172         struct fat_mount_options *options = &MSDOS_SB(parent->d_sb)->options;
173         unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME];
174         int error;
175 
176         error = msdos_format_name(name->name, name->len, a_msdos_name, options);
177         if (error)
178                 goto old_compare;
179         error = msdos_format_name(str, len, b_msdos_name, options);
180         if (error)
181                 goto old_compare;
182         error = memcmp(a_msdos_name, b_msdos_name, MSDOS_NAME);
183 out:
184         return error;
185 
186 old_compare:
187         error = 1;
188         if (name->len == len)
189                 error = memcmp(name->name, str, len);
190         goto out;
191 }
192 
193 static const struct dentry_operations msdos_dentry_operations = {
194         .d_hash         = msdos_hash,
195         .d_compare      = msdos_cmp,
196 };
197 
198 /*
199  * AV. Wrappers for FAT sb operations. Is it wise?
200  */
201 
202 /***** Get inode using directory and name */
203 static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
204                                    unsigned int flags)
205 {
206         struct super_block *sb = dir->i_sb;
207         struct fat_slot_info sinfo;
208         struct inode *inode;
209         int err;
210 
211         mutex_lock(&MSDOS_SB(sb)->s_lock);
212         err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
213         switch (err) {
214         case -ENOENT:
215                 inode = NULL;
216                 break;
217         case 0:
218                 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
219                 brelse(sinfo.bh);
220                 break;
221         default:
222                 inode = ERR_PTR(err);
223         }
224         mutex_unlock(&MSDOS_SB(sb)->s_lock);
225         return d_splice_alias(inode, dentry);
226 }
227 
228 /***** Creates a directory entry (name is already formatted). */
229 static int msdos_add_entry(struct inode *dir, const unsigned char *name,
230                            int is_dir, int is_hid, int cluster,
231                            struct timespec *ts, struct fat_slot_info *sinfo)
232 {
233         struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
234         struct msdos_dir_entry de;
235         __le16 time, date;
236         int err;
237 
238         memcpy(de.name, name, MSDOS_NAME);
239         de.attr = is_dir ? ATTR_DIR : ATTR_ARCH;
240         if (is_hid)
241                 de.attr |= ATTR_HIDDEN;
242         de.lcase = 0;
243         fat_time_unix2fat(sbi, ts, &time, &date, NULL);
244         de.cdate = de.adate = 0;
245         de.ctime = 0;
246         de.ctime_cs = 0;
247         de.time = time;
248         de.date = date;
249         fat_set_start(&de, cluster);
250         de.size = 0;
251 
252         err = fat_add_entries(dir, &de, 1, sinfo);
253         if (err)
254                 return err;
255 
256         dir->i_ctime = dir->i_mtime = *ts;
257         if (IS_DIRSYNC(dir))
258                 (void)fat_sync_inode(dir);
259         else
260                 mark_inode_dirty(dir);
261 
262         return 0;
263 }
264 
265 /***** Create a file */
266 static int msdos_create(struct inode *dir, struct dentry *dentry, umode_t mode,
267                         bool excl)
268 {
269         struct super_block *sb = dir->i_sb;
270         struct inode *inode = NULL;
271         struct fat_slot_info sinfo;
272         struct timespec ts;
273         unsigned char msdos_name[MSDOS_NAME];
274         int err, is_hid;
275 
276         mutex_lock(&MSDOS_SB(sb)->s_lock);
277 
278         err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
279                                 msdos_name, &MSDOS_SB(sb)->options);
280         if (err)
281                 goto out;
282         is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
283         /* Have to do it due to foo vs. .foo conflicts */
284         if (!fat_scan(dir, msdos_name, &sinfo)) {
285                 brelse(sinfo.bh);
286                 err = -EINVAL;
287                 goto out;
288         }
289 
290         ts = CURRENT_TIME_SEC;
291         err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo);
292         if (err)
293                 goto out;
294         inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
295         brelse(sinfo.bh);
296         if (IS_ERR(inode)) {
297                 err = PTR_ERR(inode);
298                 goto out;
299         }
300         inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
301         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
302 
303         d_instantiate(dentry, inode);
304 out:
305         mutex_unlock(&MSDOS_SB(sb)->s_lock);
306         if (!err)
307                 err = fat_flush_inodes(sb, dir, inode);
308         return err;
309 }
310 
311 /***** Remove a directory */
312 static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
313 {
314         struct super_block *sb = dir->i_sb;
315         struct inode *inode = dentry->d_inode;
316         struct fat_slot_info sinfo;
317         int err;
318 
319         mutex_lock(&MSDOS_SB(sb)->s_lock);
320         /*
321          * Check whether the directory is not in use, then check
322          * whether it is empty.
323          */
324         err = fat_dir_empty(inode);
325         if (err)
326                 goto out;
327         err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
328         if (err)
329                 goto out;
330 
331         err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
332         if (err)
333                 goto out;
334         drop_nlink(dir);
335 
336         clear_nlink(inode);
337         inode->i_ctime = CURRENT_TIME_SEC;
338         fat_detach(inode);
339 out:
340         mutex_unlock(&MSDOS_SB(sb)->s_lock);
341         if (!err)
342                 err = fat_flush_inodes(sb, dir, inode);
343 
344         return err;
345 }
346 
347 /***** Make a directory */
348 static int msdos_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
349 {
350         struct super_block *sb = dir->i_sb;
351         struct fat_slot_info sinfo;
352         struct inode *inode;
353         unsigned char msdos_name[MSDOS_NAME];
354         struct timespec ts;
355         int err, is_hid, cluster;
356 
357         mutex_lock(&MSDOS_SB(sb)->s_lock);
358 
359         err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
360                                 msdos_name, &MSDOS_SB(sb)->options);
361         if (err)
362                 goto out;
363         is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
364         /* foo vs .foo situation */
365         if (!fat_scan(dir, msdos_name, &sinfo)) {
366                 brelse(sinfo.bh);
367                 err = -EINVAL;
368                 goto out;
369         }
370 
371         ts = CURRENT_TIME_SEC;
372         cluster = fat_alloc_new_dir(dir, &ts);
373         if (cluster < 0) {
374                 err = cluster;
375                 goto out;
376         }
377         err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo);
378         if (err)
379                 goto out_free;
380         inc_nlink(dir);
381 
382         inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
383         brelse(sinfo.bh);
384         if (IS_ERR(inode)) {
385                 err = PTR_ERR(inode);
386                 /* the directory was completed, just return a error */
387                 goto out;
388         }
389         set_nlink(inode, 2);
390         inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
391         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
392 
393         d_instantiate(dentry, inode);
394 
395         mutex_unlock(&MSDOS_SB(sb)->s_lock);
396         fat_flush_inodes(sb, dir, inode);
397         return 0;
398 
399 out_free:
400         fat_free_clusters(dir, cluster);
401 out:
402         mutex_unlock(&MSDOS_SB(sb)->s_lock);
403         return err;
404 }
405 
406 /***** Unlink a file */
407 static int msdos_unlink(struct inode *dir, struct dentry *dentry)
408 {
409         struct inode *inode = dentry->d_inode;
410         struct super_block *sb = inode->i_sb;
411         struct fat_slot_info sinfo;
412         int err;
413 
414         mutex_lock(&MSDOS_SB(sb)->s_lock);
415         err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
416         if (err)
417                 goto out;
418 
419         err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
420         if (err)
421                 goto out;
422         clear_nlink(inode);
423         inode->i_ctime = CURRENT_TIME_SEC;
424         fat_detach(inode);
425 out:
426         mutex_unlock(&MSDOS_SB(sb)->s_lock);
427         if (!err)
428                 err = fat_flush_inodes(sb, dir, inode);
429 
430         return err;
431 }
432 
433 static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
434                            struct dentry *old_dentry,
435                            struct inode *new_dir, unsigned char *new_name,
436                            struct dentry *new_dentry, int is_hid)
437 {
438         struct buffer_head *dotdot_bh;
439         struct msdos_dir_entry *dotdot_de;
440         struct inode *old_inode, *new_inode;
441         struct fat_slot_info old_sinfo, sinfo;
442         struct timespec ts;
443         loff_t new_i_pos;
444         int err, old_attrs, is_dir, update_dotdot, corrupt = 0;
445 
446         old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
447         old_inode = old_dentry->d_inode;
448         new_inode = new_dentry->d_inode;
449 
450         err = fat_scan(old_dir, old_name, &old_sinfo);
451         if (err) {
452                 err = -EIO;
453                 goto out;
454         }
455 
456         is_dir = S_ISDIR(old_inode->i_mode);
457         update_dotdot = (is_dir && old_dir != new_dir);
458         if (update_dotdot) {
459                 if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) {
460                         err = -EIO;
461                         goto out;
462                 }
463         }
464 
465         old_attrs = MSDOS_I(old_inode)->i_attrs;
466         err = fat_scan(new_dir, new_name, &sinfo);
467         if (!err) {
468                 if (!new_inode) {
469                         /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */
470                         if (sinfo.de != old_sinfo.de) {
471                                 err = -EINVAL;
472                                 goto out;
473                         }
474                         if (is_hid)
475                                 MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
476                         else
477                                 MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
478                         if (IS_DIRSYNC(old_dir)) {
479                                 err = fat_sync_inode(old_inode);
480                                 if (err) {
481                                         MSDOS_I(old_inode)->i_attrs = old_attrs;
482                                         goto out;
483                                 }
484                         } else
485                                 mark_inode_dirty(old_inode);
486 
487                         old_dir->i_version++;
488                         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
489                         if (IS_DIRSYNC(old_dir))
490                                 (void)fat_sync_inode(old_dir);
491                         else
492                                 mark_inode_dirty(old_dir);
493                         goto out;
494                 }
495         }
496 
497         ts = CURRENT_TIME_SEC;
498         if (new_inode) {
499                 if (err)
500                         goto out;
501                 if (is_dir) {
502                         err = fat_dir_empty(new_inode);
503                         if (err)
504                                 goto out;
505                 }
506                 new_i_pos = MSDOS_I(new_inode)->i_pos;
507                 fat_detach(new_inode);
508         } else {
509                 err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0,
510                                       &ts, &sinfo);
511                 if (err)
512                         goto out;
513                 new_i_pos = sinfo.i_pos;
514         }
515         new_dir->i_version++;
516 
517         fat_detach(old_inode);
518         fat_attach(old_inode, new_i_pos);
519         if (is_hid)
520                 MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
521         else
522                 MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
523         if (IS_DIRSYNC(new_dir)) {
524                 err = fat_sync_inode(old_inode);
525                 if (err)
526                         goto error_inode;
527         } else
528                 mark_inode_dirty(old_inode);
529 
530         if (update_dotdot) {
531                 fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart);
532                 mark_buffer_dirty_inode(dotdot_bh, old_inode);
533                 if (IS_DIRSYNC(new_dir)) {
534                         err = sync_dirty_buffer(dotdot_bh);
535                         if (err)
536                                 goto error_dotdot;
537                 }
538                 drop_nlink(old_dir);
539                 if (!new_inode)
540                         inc_nlink(new_dir);
541         }
542 
543         err = fat_remove_entries(old_dir, &old_sinfo);  /* and releases bh */
544         old_sinfo.bh = NULL;
545         if (err)
546                 goto error_dotdot;
547         old_dir->i_version++;
548         old_dir->i_ctime = old_dir->i_mtime = ts;
549         if (IS_DIRSYNC(old_dir))
550                 (void)fat_sync_inode(old_dir);
551         else
552                 mark_inode_dirty(old_dir);
553 
554         if (new_inode) {
555                 drop_nlink(new_inode);
556                 if (is_dir)
557                         drop_nlink(new_inode);
558                 new_inode->i_ctime = ts;
559         }
560 out:
561         brelse(sinfo.bh);
562         brelse(dotdot_bh);
563         brelse(old_sinfo.bh);
564         return err;
565 
566 error_dotdot:
567         /* data cluster is shared, serious corruption */
568         corrupt = 1;
569 
570         if (update_dotdot) {
571                 fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart);
572                 mark_buffer_dirty_inode(dotdot_bh, old_inode);
573                 corrupt |= sync_dirty_buffer(dotdot_bh);
574         }
575 error_inode:
576         fat_detach(old_inode);
577         fat_attach(old_inode, old_sinfo.i_pos);
578         MSDOS_I(old_inode)->i_attrs = old_attrs;
579         if (new_inode) {
580                 fat_attach(new_inode, new_i_pos);
581                 if (corrupt)
582                         corrupt |= fat_sync_inode(new_inode);
583         } else {
584                 /*
585                  * If new entry was not sharing the data cluster, it
586                  * shouldn't be serious corruption.
587                  */
588                 int err2 = fat_remove_entries(new_dir, &sinfo);
589                 if (corrupt)
590                         corrupt |= err2;
591                 sinfo.bh = NULL;
592         }
593         if (corrupt < 0) {
594                 fat_fs_error(new_dir->i_sb,
595                              "%s: Filesystem corrupted (i_pos %lld)",
596                              __func__, sinfo.i_pos);
597         }
598         goto out;
599 }
600 
601 /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */
602 static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
603                         struct inode *new_dir, struct dentry *new_dentry)
604 {
605         struct super_block *sb = old_dir->i_sb;
606         unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
607         int err, is_hid;
608 
609         mutex_lock(&MSDOS_SB(sb)->s_lock);
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:
628         mutex_unlock(&MSDOS_SB(sb)->s_lock);
629         if (!err)
630                 err = fat_flush_inodes(sb, old_dir, new_dir);
631         return err;
632 }
633 
634 static const struct inode_operations msdos_dir_inode_operations = {
635         .create         = msdos_create,
636         .lookup         = msdos_lookup,
637         .unlink         = msdos_unlink,
638         .mkdir          = msdos_mkdir,
639         .rmdir          = msdos_rmdir,
640         .rename         = msdos_rename,
641         .setattr        = fat_setattr,
642         .getattr        = fat_getattr,
643 };
644 
645 static void setup(struct super_block *sb)
646 {
647         MSDOS_SB(sb)->dir_ops = &msdos_dir_inode_operations;
648         sb->s_d_op = &msdos_dentry_operations;
649         sb->s_flags |= MS_NOATIME;
650 }
651 
652 static int msdos_fill_super(struct super_block *sb, void *data, int silent)
653 {
654         return fat_fill_super(sb, data, silent, 0, setup);
655 }
656 
657 static struct dentry *msdos_mount(struct file_system_type *fs_type,
658                         int flags, const char *dev_name,
659                         void *data)
660 {
661         return mount_bdev(fs_type, flags, dev_name, data, msdos_fill_super);
662 }
663 
664 static struct file_system_type msdos_fs_type = {
665         .owner          = THIS_MODULE,
666         .name           = "msdos",
667         .mount          = msdos_mount,
668         .kill_sb        = kill_block_super,
669         .fs_flags       = FS_REQUIRES_DEV,
670 };
671 
672 static int __init init_msdos_fs(void)
673 {
674         return register_filesystem(&msdos_fs_type);
675 }
676 
677 static void __exit exit_msdos_fs(void)
678 {
679         unregister_filesystem(&msdos_fs_type);
680 }
681 
682 MODULE_LICENSE("GPL");
683 MODULE_AUTHOR("Werner Almesberger");
684 MODULE_DESCRIPTION("MS-DOS filesystem support");
685 
686 module_init(init_msdos_fs)
687 module_exit(exit_msdos_fs)
688 

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