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