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