fs/fat/namei_msdos.c

   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(struct dentry *dentry, struct qstr *qstr)
 152 {
 153         struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
 154         unsigned char msdos_name[MSDOS_NAME];
 155         int error;
 156
 157         error = msdos_format_name(qstr->name, qstr->len, msdos_name, options);
 158         if (!error)
 159                 qstr->hash = full_name_hash(msdos_name, MSDOS_NAME);
 160         return 0;
 161 }
 162
 163 /*
 164  * Compare two msdos names. If either of the names are invalid,
 165  * we fall back to doing the standard name comparison.
 166  */
 167 static int msdos_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b)
 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(a->name, a->len, a_msdos_name, options);
 174         if (error)
 175                 goto old_compare;
 176         error = msdos_format_name(b->name, b->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 (a->len == b->len)
 186                 error = memcmp(a->name, b->name, a->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                                    struct nameidata *nd)
 202 {
 203         struct super_block *sb = dir->i_sb;
 204         struct fat_slot_info sinfo;
 205         struct inode *inode;
 206         int err;
 207
 208         lock_super(sb);
 209
 210         err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
 211         if (err) {
 212                 if (err == -ENOENT) {
 213                         inode = NULL;
 214                         goto out;
 215                 }
 216                 goto error;
 217         }
 218
 219         inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
 220         brelse(sinfo.bh);
 221         if (IS_ERR(inode)) {
 222                 err = PTR_ERR(inode);
 223                 goto error;
 224         }
 225 out:
 226         unlock_super(sb);
 227         dentry->d_op = &msdos_dentry_operations;
 228         dentry = d_splice_alias(inode, dentry);
 229         if (dentry)
 230                 dentry->d_op = &msdos_dentry_operations;
 231         return dentry;
 232
 233 error:
 234         unlock_super(sb);
 235         return ERR_PTR(err);
 236 }
 237
 238 /***** Creates a directory entry (name is already formatted). */
 239 static int msdos_add_entry(struct inode *dir, const unsigned char *name,
 240                            int is_dir, int is_hid, int cluster,
 241                            struct timespec *ts, struct fat_slot_info *sinfo)
 242 {
 243         struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
 244         struct msdos_dir_entry de;
 245         __le16 time, date;
 246         int err;
 247
 248         memcpy(de.name, name, MSDOS_NAME);
 249         de.attr = is_dir ? ATTR_DIR : ATTR_ARCH;
 250         if (is_hid)
 251                 de.attr |= ATTR_HIDDEN;
 252         de.lcase = 0;
 253         fat_time_unix2fat(sbi, ts, &time, &date, NULL);
 254         de.cdate = de.adate = 0;
 255         de.ctime = 0;
 256         de.ctime_cs = 0;
 257         de.time = time;
 258         de.date = date;
 259         de.start = cpu_to_le16(cluster);
 260         de.starthi = cpu_to_le16(cluster >> 16);
 261         de.size = 0;
 262
 263         err = fat_add_entries(dir, &de, 1, sinfo);
 264         if (err)
 265                 return err;
 266
 267         dir->i_ctime = dir->i_mtime = *ts;
 268         if (IS_DIRSYNC(dir))
 269                 (void)fat_sync_inode(dir);
 270         else
 271                 mark_inode_dirty(dir);
 272
 273         return 0;
 274 }
 275
 276 /***** Create a file */
 277 static int msdos_create(struct inode *dir, struct dentry *dentry, int mode,
 278                         struct nameidata *nd)
 279 {
 280         struct super_block *sb = dir->i_sb;
 281         struct inode *inode = NULL;
 282         struct fat_slot_info sinfo;
 283         struct timespec ts;
 284         unsigned char msdos_name[MSDOS_NAME];
 285         int err, is_hid;
 286
 287         lock_super(sb);
 288
 289         err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
 290                                 msdos_name, &MSDOS_SB(sb)->options);
 291         if (err)
 292                 goto out;
 293         is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
 294         /* Have to do it due to foo vs. .foo conflicts */
 295         if (!fat_scan(dir, msdos_name, &sinfo)) {
 296                 brelse(sinfo.bh);
 297                 err = -EINVAL;
 298                 goto out;
 299         }
 300
 301         ts = CURRENT_TIME_SEC;
 302         err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo);
 303         if (err)
 304                 goto out;
 305         inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
 306         brelse(sinfo.bh);
 307         if (IS_ERR(inode)) {
 308                 err = PTR_ERR(inode);
 309                 goto out;
 310         }
 311         inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
 312         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
 313
 314         d_instantiate(dentry, inode);
 315 out:
 316         unlock_super(sb);
 317         if (!err)
 318                 err = fat_flush_inodes(sb, dir, inode);
 319         return err;
 320 }
 321
 322 /***** Remove a directory */
 323 static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
 324 {
 325         struct super_block *sb = dir->i_sb;
 326         struct inode *inode = dentry->d_inode;
 327         struct fat_slot_info sinfo;
 328         int err;
 329
 330         lock_super(sb);
 331         /*
 332          * Check whether the directory is not in use, then check
 333          * whether it is empty.
 334          */
 335         err = fat_dir_empty(inode);
 336         if (err)
 337                 goto out;
 338         err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
 339         if (err)
 340                 goto out;
 341
 342         err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
 343         if (err)
 344                 goto out;
 345         drop_nlink(dir);
 346
 347         clear_nlink(inode);
 348         inode->i_ctime = CURRENT_TIME_SEC;
 349         fat_detach(inode);
 350 out:
 351         unlock_super(sb);
 352         if (!err)
 353                 err = fat_flush_inodes(sb, dir, inode);
 354
 355         return err;
 356 }
 357
 358 /***** Make a directory */
 359 static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 360 {
 361         struct super_block *sb = dir->i_sb;
 362         struct fat_slot_info sinfo;
 363         struct inode *inode;
 364         unsigned char msdos_name[MSDOS_NAME];
 365         struct timespec ts;
 366         int err, is_hid, cluster;
 367
 368         lock_super(sb);
 369
 370         err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
 371                                 msdos_name, &MSDOS_SB(sb)->options);
 372         if (err)
 373                 goto out;
 374         is_hid = (dentry->d_name.name[0] == '.') && (msdos_name[0] != '.');
 375         /* foo vs .foo situation */
 376         if (!fat_scan(dir, msdos_name, &sinfo)) {
 377                 brelse(sinfo.bh);
 378                 err = -EINVAL;
 379                 goto out;
 380         }
 381
 382         ts = CURRENT_TIME_SEC;
 383         cluster = fat_alloc_new_dir(dir, &ts);
 384         if (cluster < 0) {
 385                 err = cluster;
 386                 goto out;
 387         }
 388         err = msdos_add_entry(dir, msdos_name, 1, is_hid, cluster, &ts, &sinfo);
 389         if (err)
 390                 goto out_free;
 391         inc_nlink(dir);
 392
 393         inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
 394         brelse(sinfo.bh);
 395         if (IS_ERR(inode)) {
 396                 err = PTR_ERR(inode);
 397                 /* the directory was completed, just return a error */
 398                 goto out;
 399         }
 400         inode->i_nlink = 2;
 401         inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
 402         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
 403
 404         d_instantiate(dentry, inode);
 405
 406         unlock_super(sb);
 407         fat_flush_inodes(sb, dir, inode);
 408         return 0;
 409
 410 out_free:
 411         fat_free_clusters(dir, cluster);
 412 out:
 413         unlock_super(sb);
 414         return err;
 415 }
 416
 417 /***** Unlink a file */
 418 static int msdos_unlink(struct inode *dir, struct dentry *dentry)
 419 {
 420         struct inode *inode = dentry->d_inode;
 421         struct super_block *sb= inode->i_sb;
 422         struct fat_slot_info sinfo;
 423         int err;
 424
 425         lock_super(sb);
 426         err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
 427         if (err)
 428                 goto out;
 429
 430         err = fat_remove_entries(dir, &sinfo);  /* and releases bh */
 431         if (err)
 432                 goto out;
 433         clear_nlink(inode);
 434         inode->i_ctime = CURRENT_TIME_SEC;
 435         fat_detach(inode);
 436 out:
 437         unlock_super(sb);
 438         if (!err)
 439                 err = fat_flush_inodes(sb, dir, inode);
 440
 441         return err;
 442 }
 443
 444 static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
 445                            struct dentry *old_dentry,
 446                            struct inode *new_dir, unsigned char *new_name,
 447                            struct dentry *new_dentry, int is_hid)
 448 {
 449         struct buffer_head *dotdot_bh;
 450         struct msdos_dir_entry *dotdot_de;
 451         struct inode *old_inode, *new_inode;
 452         struct fat_slot_info old_sinfo, sinfo;
 453         struct timespec ts;
 454         loff_t dotdot_i_pos, new_i_pos;
 455         int err, old_attrs, is_dir, update_dotdot, corrupt = 0;
 456
 457         old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
 458         old_inode = old_dentry->d_inode;
 459         new_inode = new_dentry->d_inode;
 460
 461         err = fat_scan(old_dir, old_name, &old_sinfo);
 462         if (err) {
 463                 err = -EIO;
 464                 goto out;
 465         }
 466
 467         is_dir = S_ISDIR(old_inode->i_mode);
 468         update_dotdot = (is_dir && old_dir != new_dir);
 469         if (update_dotdot) {
 470                 if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de,
 471                                          &dotdot_i_pos) < 0) {
 472                         err = -EIO;
 473                         goto out;
 474                 }
 475         }
 476
 477         old_attrs = MSDOS_I(old_inode)->i_attrs;
 478         err = fat_scan(new_dir, new_name, &sinfo);
 479         if (!err) {
 480                 if (!new_inode) {
 481                         /* "foo" -> ".foo" case. just change the ATTR_HIDDEN */
 482                         if (sinfo.de != old_sinfo.de) {
 483                                 err = -EINVAL;
 484                                 goto out;
 485                         }
 486                         if (is_hid)
 487                                 MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
 488                         else
 489                                 MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
 490                         if (IS_DIRSYNC(old_dir)) {
 491                                 err = fat_sync_inode(old_inode);
 492                                 if (err) {
 493                                         MSDOS_I(old_inode)->i_attrs = old_attrs;
 494                                         goto out;
 495                                 }
 496                         } else
 497                                 mark_inode_dirty(old_inode);
 498
 499                         old_dir->i_version++;
 500                         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
 501                         if (IS_DIRSYNC(old_dir))
 502                                 (void)fat_sync_inode(old_dir);
 503                         else
 504                                 mark_inode_dirty(old_dir);
 505                         goto out;
 506                 }
 507         }
 508
 509         ts = CURRENT_TIME_SEC;
 510         if (new_inode) {
 511                 if (err)
 512                         goto out;
 513                 if (is_dir) {
 514                         err = fat_dir_empty(new_inode);
 515                         if (err)
 516                                 goto out;
 517                 }
 518                 new_i_pos = MSDOS_I(new_inode)->i_pos;
 519                 fat_detach(new_inode);
 520         } else {
 521                 err = msdos_add_entry(new_dir, new_name, is_dir, is_hid, 0,
 522                                       &ts, &sinfo);
 523                 if (err)
 524                         goto out;
 525                 new_i_pos = sinfo.i_pos;
 526         }
 527         new_dir->i_version++;
 528
 529         fat_detach(old_inode);
 530         fat_attach(old_inode, new_i_pos);
 531         if (is_hid)
 532                 MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
 533         else
 534                 MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
 535         if (IS_DIRSYNC(new_dir)) {
 536                 err = fat_sync_inode(old_inode);
 537                 if (err)
 538                         goto error_inode;
 539         } else
 540                 mark_inode_dirty(old_inode);
 541
 542         if (update_dotdot) {
 543                 int start = MSDOS_I(new_dir)->i_logstart;
 544                 dotdot_de->start = cpu_to_le16(start);
 545                 dotdot_de->starthi = cpu_to_le16(start >> 16);
 546                 mark_buffer_dirty_inode(dotdot_bh, old_inode);
 547                 if (IS_DIRSYNC(new_dir)) {
 548                         err = sync_dirty_buffer(dotdot_bh);
 549                         if (err)
 550                                 goto error_dotdot;
 551                 }
 552                 drop_nlink(old_dir);
 553                 if (!new_inode)
 554                         inc_nlink(new_dir);
 555         }
 556
 557         err = fat_remove_entries(old_dir, &old_sinfo);  /* and releases bh */
 558         old_sinfo.bh = NULL;
 559         if (err)
 560                 goto error_dotdot;
 561         old_dir->i_version++;
 562         old_dir->i_ctime = old_dir->i_mtime = ts;
 563         if (IS_DIRSYNC(old_dir))
 564                 (void)fat_sync_inode(old_dir);
 565         else
 566                 mark_inode_dirty(old_dir);
 567
 568         if (new_inode) {
 569                 drop_nlink(new_inode);
 570                 if (is_dir)
 571                         drop_nlink(new_inode);
 572                 new_inode->i_ctime = ts;
 573         }
 574 out:
 575         brelse(sinfo.bh);
 576         brelse(dotdot_bh);
 577         brelse(old_sinfo.bh);
 578         return err;
 579
 580 error_dotdot:
 581         /* data cluster is shared, serious corruption */
 582         corrupt = 1;
 583
 584         if (update_dotdot) {
 585                 int start = MSDOS_I(old_dir)->i_logstart;
 586                 dotdot_de->start = cpu_to_le16(start);
 587                 dotdot_de->starthi = cpu_to_le16(start >> 16);
 588                 mark_buffer_dirty_inode(dotdot_bh, old_inode);
 589                 corrupt |= sync_dirty_buffer(dotdot_bh);
 590         }
 591 error_inode:
 592         fat_detach(old_inode);
 593         fat_attach(old_inode, old_sinfo.i_pos);
 594         MSDOS_I(old_inode)->i_attrs = old_attrs;
 595         if (new_inode) {
 596                 fat_attach(new_inode, new_i_pos);
 597                 if (corrupt)
 598                         corrupt |= fat_sync_inode(new_inode);
 599         } else {
 600                 /*
 601                  * If new entry was not sharing the data cluster, it
 602                  * shouldn't be serious corruption.
 603                  */
 604                 int err2 = fat_remove_entries(new_dir, &sinfo);
 605                 if (corrupt)
 606                         corrupt |= err2;
 607                 sinfo.bh = NULL;
 608         }
 609         if (corrupt < 0) {
 610                 fat_fs_error(new_dir->i_sb,
 611                              "%s: Filesystem corrupted (i_pos %lld)",
 612                              __func__, sinfo.i_pos);
 613         }
 614         goto out;
 615 }
 616
 617 /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */
 618 static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
 619                         struct inode *new_dir, struct dentry *new_dentry)
 620 {
 621         struct super_block *sb = old_dir->i_sb;
 622         unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
 623         int err, is_hid;
 624
 625         lock_super(sb);
 626
 627         err = msdos_format_name(old_dentry->d_name.name,
 628                                 old_dentry->d_name.len, old_msdos_name,
 629                                 &MSDOS_SB(old_dir->i_sb)->options);
 630         if (err)
 631                 goto out;
 632         err = msdos_format_name(new_dentry->d_name.name,
 633                                 new_dentry->d_name.len, new_msdos_name,
 634                                 &MSDOS_SB(new_dir->i_sb)->options);
 635         if (err)
 636                 goto out;
 637
 638         is_hid =
 639              (new_dentry->d_name.name[0] == '.') && (new_msdos_name[0] != '.');
 640
 641         err = do_msdos_rename(old_dir, old_msdos_name, old_dentry,
 642                               new_dir, new_msdos_name, new_dentry, is_hid);
 643 out:
 644         unlock_super(sb);
 645         if (!err)
 646                 err = fat_flush_inodes(sb, old_dir, new_dir);
 647         return err;
 648 }
 649
 650 static const struct inode_operations msdos_dir_inode_operations = {
 651         .create         = msdos_create,
 652         .lookup         = msdos_lookup,
 653         .unlink         = msdos_unlink,
 654         .mkdir          = msdos_mkdir,
 655         .rmdir          = msdos_rmdir,
 656         .rename         = msdos_rename,
 657         .setattr        = fat_setattr,
 658         .getattr        = fat_getattr,
 659 };
 660
 661 static int msdos_fill_super(struct super_block *sb, void *data, int silent)
 662 {
 663         int res;
 664
 665         res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0);
 666         if (res)
 667                 return res;
 668
 669         sb->s_flags |= MS_NOATIME;
 670         sb->s_root->d_op = &msdos_dentry_operations;
 671         return 0;
 672 }
 673
 674 static int msdos_get_sb(struct file_system_type *fs_type,
 675                         int flags, const char *dev_name,
 676                         void *data, struct vfsmount *mnt)
 677 {
 678         return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super,
 679                            mnt);
 680 }
 681
 682 static struct file_system_type msdos_fs_type = {
 683         .owner          = THIS_MODULE,
 684         .name           = "msdos",
 685         .get_sb         = msdos_get_sb,
 686         .kill_sb        = kill_block_super,
 687         .fs_flags       = FS_REQUIRES_DEV,
 688 };
 689
 690 static int __init init_msdos_fs(void)
 691 {
 692         return register_filesystem(&msdos_fs_type);
 693 }
 694
 695 static void __exit exit_msdos_fs(void)
 696 {
 697         unregister_filesystem(&msdos_fs_type);
 698 }
 699
 700 MODULE_LICENSE("GPL");
 701 MODULE_AUTHOR("Werner Almesberger");
 702 MODULE_DESCRIPTION("MS-DOS filesystem support");
 703
 704 module_init(init_msdos_fs)
 705 module_exit(exit_msdos_fs)