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