fs/hpfs/super.c

   1 /*
   2  *  linux/fs/hpfs/super.c
   3  *
   4  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   5  *
   6  *  mounting, unmounting, error handling
   7  */
   8
   9 #include "hpfs_fn.h"
  10 #include <linux/module.h>
  11 #include <linux/parser.h>
  12 #include <linux/init.h>
  13 #include <linux/statfs.h>
  14 #include <linux/magic.h>
  15 #include <linux/sched.h>
  16 #include <linux/bitmap.h>
  17 #include <linux/slab.h>
  18
  19 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
  20
  21 static void mark_dirty(struct super_block *s, int remount)
  22 {
  23         if (hpfs_sb(s)->sb_chkdsk && (remount || !(s->s_flags & MS_RDONLY))) {
  24                 struct buffer_head *bh;
  25                 struct hpfs_spare_block *sb;
  26                 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  27                         sb->dirty = 1;
  28                         sb->old_wrote = 0;
  29                         mark_buffer_dirty(bh);
  30                         sync_dirty_buffer(bh);
  31                         brelse(bh);
  32                 }
  33         }
  34 }
  35
  36 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
  37    were errors) */
  38
  39 static void unmark_dirty(struct super_block *s)
  40 {
  41         struct buffer_head *bh;
  42         struct hpfs_spare_block *sb;
  43         if (s->s_flags & MS_RDONLY) return;
  44         sync_blockdev(s->s_bdev);
  45         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  46                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
  47                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
  48                 mark_buffer_dirty(bh);
  49                 sync_dirty_buffer(bh);
  50                 brelse(bh);
  51         }
  52 }
  53
  54 /* Filesystem error... */
  55 static char err_buf[1024];
  56
  57 void hpfs_error(struct super_block *s, const char *fmt, ...)
  58 {
  59         va_list args;
  60
  61         va_start(args, fmt);
  62         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
  63         va_end(args);
  64
  65         printk("HPFS: filesystem error: %s", err_buf);
  66         if (!hpfs_sb(s)->sb_was_error) {
  67                 if (hpfs_sb(s)->sb_err == 2) {
  68                         printk("; crashing the system because you wanted it\n");
  69                         mark_dirty(s, 0);
  70                         panic("HPFS panic");
  71                 } else if (hpfs_sb(s)->sb_err == 1) {
  72                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
  73                         else {
  74                                 printk("; remounting read-only\n");
  75                                 mark_dirty(s, 0);
  76                                 s->s_flags |= MS_RDONLY;
  77                         }
  78                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
  79                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  80         } else printk("\n");
  81         hpfs_sb(s)->sb_was_error = 1;
  82 }
  83
  84 /*
  85  * A little trick to detect cycles in many hpfs structures and don't let the
  86  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
  87  *
  88  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
  89  * nested each in other, chkdsk locked up happilly.
  90  */
  91
  92 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
  93                 char *msg)
  94 {
  95         if (*c2 && *c1 == key) {
  96                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
  97                 return 1;
  98         }
  99         (*c2)++;
 100         if (!((*c2 - 1) & *c2)) *c1 = key;
 101         return 0;
 102 }
 103
 104 static void free_sbi(struct hpfs_sb_info *sbi)
 105 {
 106         kfree(sbi->sb_cp_table);
 107         kfree(sbi->sb_bmp_dir);
 108         kfree(sbi);
 109 }
 110
 111 static void lazy_free_sbi(struct rcu_head *rcu)
 112 {
 113         free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
 114 }
 115
 116 static void hpfs_put_super(struct super_block *s)
 117 {
 118         hpfs_lock(s);
 119         unmark_dirty(s);
 120         hpfs_unlock(s);
 121         call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
 122 }
 123
 124 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 125 {
 126         struct quad_buffer_head qbh;
 127         unsigned long *bits;
 128         unsigned count;
 129
 130         bits = hpfs_map_4sectors(s, secno, &qbh, 0);
 131         if (!bits)
 132                 return (unsigned)-1;
 133         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 134         hpfs_brelse4(&qbh);
 135         return count;
 136 }
 137
 138 static unsigned count_bitmaps(struct super_block *s)
 139 {
 140         unsigned n, count, n_bands;
 141         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 142         count = 0;
 143         for (n = 0; n < COUNT_RD_AHEAD; n++) {
 144                 hpfs_prefetch_bitmap(s, n);
 145         }
 146         for (n = 0; n < n_bands; n++) {
 147                 unsigned c;
 148                 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
 149                 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
 150                 if (c != (unsigned)-1)
 151                         count += c;
 152         }
 153         return count;
 154 }
 155
 156 unsigned hpfs_get_free_dnodes(struct super_block *s)
 157 {
 158         struct hpfs_sb_info *sbi = hpfs_sb(s);
 159         if (sbi->sb_n_free_dnodes == (unsigned)-1) {
 160                 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 161                 if (c == (unsigned)-1)
 162                         return 0;
 163                 sbi->sb_n_free_dnodes = c;
 164         }
 165         return sbi->sb_n_free_dnodes;
 166 }
 167
 168 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 169 {
 170         struct super_block *s = dentry->d_sb;
 171         struct hpfs_sb_info *sbi = hpfs_sb(s);
 172         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 173
 174         hpfs_lock(s);
 175
 176         if (sbi->sb_n_free == (unsigned)-1)
 177                 sbi->sb_n_free = count_bitmaps(s);
 178
 179         buf->f_type = s->s_magic;
 180         buf->f_bsize = 512;
 181         buf->f_blocks = sbi->sb_fs_size;
 182         buf->f_bfree = sbi->sb_n_free;
 183         buf->f_bavail = sbi->sb_n_free;
 184         buf->f_files = sbi->sb_dirband_size / 4;
 185         buf->f_ffree = hpfs_get_free_dnodes(s);
 186         buf->f_fsid.val[0] = (u32)id;
 187         buf->f_fsid.val[1] = (u32)(id >> 32);
 188         buf->f_namelen = 254;
 189
 190         hpfs_unlock(s);
 191
 192         return 0;
 193 }
 194
 195 static struct kmem_cache * hpfs_inode_cachep;
 196
 197 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 198 {
 199         struct hpfs_inode_info *ei;
 200         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 201         if (!ei)
 202                 return NULL;
 203         ei->vfs_inode.i_version = 1;
 204         return &ei->vfs_inode;
 205 }
 206
 207 static void hpfs_i_callback(struct rcu_head *head)
 208 {
 209         struct inode *inode = container_of(head, struct inode, i_rcu);
 210         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 211 }
 212
 213 static void hpfs_destroy_inode(struct inode *inode)
 214 {
 215         call_rcu(&inode->i_rcu, hpfs_i_callback);
 216 }
 217
 218 static void init_once(void *foo)
 219 {
 220         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 221
 222         inode_init_once(&ei->vfs_inode);
 223 }
 224
 225 static int init_inodecache(void)
 226 {
 227         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 228                                              sizeof(struct hpfs_inode_info),
 229                                              0, (SLAB_RECLAIM_ACCOUNT|
 230                                                 SLAB_MEM_SPREAD),
 231                                              init_once);
 232         if (hpfs_inode_cachep == NULL)
 233                 return -ENOMEM;
 234         return 0;
 235 }
 236
 237 static void destroy_inodecache(void)
 238 {
 239         /*
 240          * Make sure all delayed rcu free inodes are flushed before we
 241          * destroy cache.
 242          */
 243         rcu_barrier();
 244         kmem_cache_destroy(hpfs_inode_cachep);
 245 }
 246
 247 /*
 248  * A tiny parser for option strings, stolen from dosfs.
 249  * Stolen again from read-only hpfs.
 250  * And updated for table-driven option parsing.
 251  */
 252
 253 enum {
 254         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 255         Opt_check_none, Opt_check_normal, Opt_check_strict,
 256         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 257         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 258         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 259         Opt_timeshift, Opt_err,
 260 };
 261
 262 static const match_table_t tokens = {
 263         {Opt_help, "help"},
 264         {Opt_uid, "uid=%u"},
 265         {Opt_gid, "gid=%u"},
 266         {Opt_umask, "umask=%o"},
 267         {Opt_case_lower, "case=lower"},
 268         {Opt_case_asis, "case=asis"},
 269         {Opt_check_none, "check=none"},
 270         {Opt_check_normal, "check=normal"},
 271         {Opt_check_strict, "check=strict"},
 272         {Opt_err_cont, "errors=continue"},
 273         {Opt_err_ro, "errors=remount-ro"},
 274         {Opt_err_panic, "errors=panic"},
 275         {Opt_eas_no, "eas=no"},
 276         {Opt_eas_ro, "eas=ro"},
 277         {Opt_eas_rw, "eas=rw"},
 278         {Opt_chkdsk_no, "chkdsk=no"},
 279         {Opt_chkdsk_errors, "chkdsk=errors"},
 280         {Opt_chkdsk_always, "chkdsk=always"},
 281         {Opt_timeshift, "timeshift=%d"},
 282         {Opt_err, NULL},
 283 };
 284
 285 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
 286                       int *lowercase, int *eas, int *chk, int *errs,
 287                       int *chkdsk, int *timeshift)
 288 {
 289         char *p;
 290         int option;
 291
 292         if (!opts)
 293                 return 1;
 294
 295         /*printk("Parsing opts: '%s'\n",opts);*/
 296
 297         while ((p = strsep(&opts, ",")) != NULL) {
 298                 substring_t args[MAX_OPT_ARGS];
 299                 int token;
 300                 if (!*p)
 301                         continue;
 302
 303                 token = match_token(p, tokens, args);
 304                 switch (token) {
 305                 case Opt_help:
 306                         return 2;
 307                 case Opt_uid:
 308                         if (match_int(args, &option))
 309                                 return 0;
 310                         *uid = make_kuid(current_user_ns(), option);
 311                         if (!uid_valid(*uid))
 312                                 return 0;
 313                         break;
 314                 case Opt_gid:
 315                         if (match_int(args, &option))
 316                                 return 0;
 317                         *gid = make_kgid(current_user_ns(), option);
 318                         if (!gid_valid(*gid))
 319                                 return 0;
 320                         break;
 321                 case Opt_umask:
 322                         if (match_octal(args, &option))
 323                                 return 0;
 324                         *umask = option;
 325                         break;
 326                 case Opt_case_lower:
 327                         *lowercase = 1;
 328                         break;
 329                 case Opt_case_asis:
 330                         *lowercase = 0;
 331                         break;
 332                 case Opt_check_none:
 333                         *chk = 0;
 334                         break;
 335                 case Opt_check_normal:
 336                         *chk = 1;
 337                         break;
 338                 case Opt_check_strict:
 339                         *chk = 2;
 340                         break;
 341                 case Opt_err_cont:
 342                         *errs = 0;
 343                         break;
 344                 case Opt_err_ro:
 345                         *errs = 1;
 346                         break;
 347                 case Opt_err_panic:
 348                         *errs = 2;
 349                         break;
 350                 case Opt_eas_no:
 351                         *eas = 0;
 352                         break;
 353                 case Opt_eas_ro:
 354                         *eas = 1;
 355                         break;
 356                 case Opt_eas_rw:
 357                         *eas = 2;
 358                         break;
 359                 case Opt_chkdsk_no:
 360                         *chkdsk = 0;
 361                         break;
 362                 case Opt_chkdsk_errors:
 363                         *chkdsk = 1;
 364                         break;
 365                 case Opt_chkdsk_always:
 366                         *chkdsk = 2;
 367                         break;
 368                 case Opt_timeshift:
 369                 {
 370                         int m = 1;
 371                         char *rhs = args[0].from;
 372                         if (!rhs || !*rhs)
 373                                 return 0;
 374                         if (*rhs == '-') m = -1;
 375                         if (*rhs == '+' || *rhs == '-') rhs++;
 376                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 377                         if (*rhs)
 378                                 return 0;
 379                         break;
 380                 }
 381                 default:
 382                         return 0;
 383                 }
 384         }
 385         return 1;
 386 }
 387
 388 static inline void hpfs_help(void)
 389 {
 390         printk("\n\
 391 HPFS filesystem options:\n\
 392       help              do not mount and display this text\n\
 393       uid=xxx           set uid of files that don't have uid specified in eas\n\
 394       gid=xxx           set gid of files that don't have gid specified in eas\n\
 395       umask=xxx         set mode of files that don't have mode specified in eas\n\
 396       case=lower        lowercase all files\n\
 397       case=asis         do not lowercase files (default)\n\
 398       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 399       check=normal      do some checks - it should not crash (default)\n\
 400       check=strict      do extra time-consuming checks, used for debugging\n\
 401       errors=continue   continue on errors\n\
 402       errors=remount-ro remount read-only if errors found (default)\n\
 403       errors=panic      panic on errors\n\
 404       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 405       chkdsk=errors     mark fs dirty if errors found (default)\n\
 406       chkdsk=always     always mark fs dirty - used for debugging\n\
 407       eas=no            ignore extended attributes\n\
 408       eas=ro            read but do not write extended attributes\n\
 409       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 410       timeshift=nnn     add nnn seconds to file times\n\
 411 \n");
 412 }
 413
 414 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 415 {
 416         kuid_t uid;
 417         kgid_t gid;
 418         umode_t umask;
 419         int lowercase, eas, chk, errs, chkdsk, timeshift;
 420         int o;
 421         struct hpfs_sb_info *sbi = hpfs_sb(s);
 422         char *new_opts = kstrdup(data, GFP_KERNEL);
 423
 424         sync_filesystem(s);
 425
 426         *flags |= MS_NOATIME;
 427
 428         hpfs_lock(s);
 429         uid = sbi->sb_uid; gid = sbi->sb_gid;
 430         umask = 0777 & ~sbi->sb_mode;
 431         lowercase = sbi->sb_lowercase;
 432         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 433         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 434
 435         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 436             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 437                 printk("HPFS: bad mount options.\n");
 438                 goto out_err;
 439         }
 440         if (o == 2) {
 441                 hpfs_help();
 442                 goto out_err;
 443         }
 444         if (timeshift != sbi->sb_timeshift) {
 445                 printk("HPFS: timeshift can't be changed using remount.\n");
 446                 goto out_err;
 447         }
 448
 449         unmark_dirty(s);
 450
 451         sbi->sb_uid = uid; sbi->sb_gid = gid;
 452         sbi->sb_mode = 0777 & ~umask;
 453         sbi->sb_lowercase = lowercase;
 454         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 455         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 456
 457         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
 458
 459         replace_mount_options(s, new_opts);
 460
 461         hpfs_unlock(s);
 462         return 0;
 463
 464 out_err:
 465         hpfs_unlock(s);
 466         kfree(new_opts);
 467         return -EINVAL;
 468 }
 469
 470 /* Super operations */
 471
 472 static const struct super_operations hpfs_sops =
 473 {
 474         .alloc_inode    = hpfs_alloc_inode,
 475         .destroy_inode  = hpfs_destroy_inode,
 476         .evict_inode    = hpfs_evict_inode,
 477         .put_super      = hpfs_put_super,
 478         .statfs         = hpfs_statfs,
 479         .remount_fs     = hpfs_remount_fs,
 480         .show_options   = generic_show_options,
 481 };
 482
 483 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 484 {
 485         struct buffer_head *bh0, *bh1, *bh2;
 486         struct hpfs_boot_block *bootblock;
 487         struct hpfs_super_block *superblock;
 488         struct hpfs_spare_block *spareblock;
 489         struct hpfs_sb_info *sbi;
 490         struct inode *root;
 491
 492         kuid_t uid;
 493         kgid_t gid;
 494         umode_t umask;
 495         int lowercase, eas, chk, errs, chkdsk, timeshift;
 496
 497         dnode_secno root_dno;
 498         struct hpfs_dirent *de = NULL;
 499         struct quad_buffer_head qbh;
 500
 501         int o;
 502
 503         save_mount_options(s, options);
 504
 505         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 506         if (!sbi) {
 507                 return -ENOMEM;
 508         }
 509         s->s_fs_info = sbi;
 510
 511         mutex_init(&sbi->hpfs_mutex);
 512         hpfs_lock(s);
 513
 514         uid = current_uid();
 515         gid = current_gid();
 516         umask = current_umask();
 517         lowercase = 0;
 518         eas = 2;
 519         chk = 1;
 520         errs = 1;
 521         chkdsk = 1;
 522         timeshift = 0;
 523
 524         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
 525             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 526                 printk("HPFS: bad mount options.\n");
 527                 goto bail0;
 528         }
 529         if (o==2) {
 530                 hpfs_help();
 531                 goto bail0;
 532         }
 533
 534         /*sbi->sb_mounting = 1;*/
 535         sb_set_blocksize(s, 512);
 536         sbi->sb_fs_size = -1;
 537         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 538         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 539         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 540
 541         /* Check magics */
 542         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 543             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 544             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
 545                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
 546                 goto bail4;
 547         }
 548
 549         /* Check version */
 550         if (!(s->s_flags & MS_RDONLY) &&
 551               superblock->funcversion != 2 && superblock->funcversion != 3) {
 552                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
 553                         (int)superblock->version, (int)superblock->funcversion);
 554                 printk("HPFS: please try recent version of HPFS driver at http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi and if it still can't understand this format, contact author - mikulas@artax.karlin.mff.cuni.cz\n");
 555                 goto bail4;
 556         }
 557
 558         s->s_flags |= MS_NOATIME;
 559
 560         /* Fill superblock stuff */
 561         s->s_magic = HPFS_SUPER_MAGIC;
 562         s->s_op = &hpfs_sops;
 563         s->s_d_op = &hpfs_dentry_operations;
 564
 565         sbi->sb_root = le32_to_cpu(superblock->root);
 566         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 567         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 568         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 569         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 570         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 571         sbi->sb_uid = uid;
 572         sbi->sb_gid = gid;
 573         sbi->sb_mode = 0777 & ~umask;
 574         sbi->sb_n_free = -1;
 575         sbi->sb_n_free_dnodes = -1;
 576         sbi->sb_lowercase = lowercase;
 577         sbi->sb_eas = eas;
 578         sbi->sb_chk = chk;
 579         sbi->sb_chkdsk = chkdsk;
 580         sbi->sb_err = errs;
 581         sbi->sb_timeshift = timeshift;
 582         sbi->sb_was_error = 0;
 583         sbi->sb_cp_table = NULL;
 584         sbi->sb_c_bitmap = -1;
 585         sbi->sb_max_fwd_alloc = 0xffffff;
 586
 587         if (sbi->sb_fs_size >= 0x80000000) {
 588                 hpfs_error(s, "invalid size in superblock: %08x",
 589                         (unsigned)sbi->sb_fs_size);
 590                 goto bail4;
 591         }
 592
 593         /* Load bitmap directory */
 594         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 595                 goto bail4;
 596
 597         /* Check for general fs errors*/
 598         if (spareblock->dirty && !spareblock->old_wrote) {
 599                 if (errs == 2) {
 600                         printk("HPFS: Improperly stopped, not mounted\n");
 601                         goto bail4;
 602                 }
 603                 hpfs_error(s, "improperly stopped");
 604         }
 605
 606         if (!(s->s_flags & MS_RDONLY)) {
 607                 spareblock->dirty = 1;
 608                 spareblock->old_wrote = 0;
 609                 mark_buffer_dirty(bh2);
 610         }
 611
 612         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 613                 if (errs >= 2) {
 614                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
 615                         mark_dirty(s, 0);
 616                         goto bail4;
 617                 }
 618                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 619                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 620                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
 621         }
 622         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 623                 if (errs >= 2) {
 624                         printk("HPFS: Spare dnodes used, try chkdsk\n");
 625                         mark_dirty(s, 0);
 626                         goto bail4;
 627                 }
 628                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 629                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 630         }
 631         if (chk) {
 632                 unsigned a;
 633                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 634                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 635                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 636                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 637                         goto bail4;
 638                 }
 639                 a = sbi->sb_dirband_size;
 640                 sbi->sb_dirband_size = 0;
 641                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 642                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 643                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 644                         mark_dirty(s, 0);
 645                         goto bail4;
 646                 }
 647                 sbi->sb_dirband_size = a;
 648         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
 649
 650         /* Load code page table */
 651         if (le32_to_cpu(spareblock->n_code_pages))
 652                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 653                         printk("HPFS: Warning: code page support is disabled\n");
 654
 655         brelse(bh2);
 656         brelse(bh1);
 657         brelse(bh0);
 658
 659         root = iget_locked(s, sbi->sb_root);
 660         if (!root)
 661                 goto bail0;
 662         hpfs_init_inode(root);
 663         hpfs_read_inode(root);
 664         unlock_new_inode(root);
 665         s->s_root = d_make_root(root);
 666         if (!s->s_root)
 667                 goto bail0;
 668
 669         /*
 670          * find the root directory's . pointer & finish filling in the inode
 671          */
 672
 673         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 674         if (root_dno)
 675                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 676         if (!de)
 677                 hpfs_error(s, "unable to find root dir");
 678         else {
 679                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 680                 root->i_atime.tv_nsec = 0;
 681                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 682                 root->i_mtime.tv_nsec = 0;
 683                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 684                 root->i_ctime.tv_nsec = 0;
 685                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
 686                 hpfs_i(root)->i_parent_dir = root->i_ino;
 687                 if (root->i_size == -1)
 688                         root->i_size = 2048;
 689                 if (root->i_blocks == -1)
 690                         root->i_blocks = 5;
 691                 hpfs_brelse4(&qbh);
 692         }
 693         hpfs_unlock(s);
 694         return 0;
 695
 696 bail4:  brelse(bh2);
 697 bail3:  brelse(bh1);
 698 bail2:  brelse(bh0);
 699 bail1:
 700 bail0:
 701         hpfs_unlock(s);
 702         free_sbi(sbi);
 703         return -EINVAL;
 704 }
 705
 706 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 707         int flags, const char *dev_name, void *data)
 708 {
 709         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 710 }
 711
 712 static struct file_system_type hpfs_fs_type = {
 713         .owner          = THIS_MODULE,
 714         .name           = "hpfs",
 715         .mount          = hpfs_mount,
 716         .kill_sb        = kill_block_super,
 717         .fs_flags       = FS_REQUIRES_DEV,
 718 };
 719 MODULE_ALIAS_FS("hpfs");
 720
 721 static int __init init_hpfs_fs(void)
 722 {
 723         int err = init_inodecache();
 724         if (err)
 725                 goto out1;
 726         err = register_filesystem(&hpfs_fs_type);
 727         if (err)
 728                 goto out;
 729         return 0;
 730 out:
 731         destroy_inodecache();
 732 out1:
 733         return err;
 734 }
 735
 736 static void __exit exit_hpfs_fs(void)
 737 {
 738         unregister_filesystem(&hpfs_fs_type);
 739         destroy_inodecache();
 740 }
 741
 742 module_init(init_hpfs_fs)
 743 module_exit(exit_hpfs_fs)
 744 MODULE_LICENSE("GPL");