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