fs/hpfs/super.c

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