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 void hpfs_error(struct super_block *s, const char *fmt, ...)
  56 {
  57         struct va_format vaf;
  58         va_list args;
  59
  60         va_start(args, fmt);
  61
  62         vaf.fmt = fmt;
  63         vaf.va = &args;
  64
  65         pr_err("filesystem error: %pV", &vaf);
  66
  67         va_end(args);
  68
  69         if (!hpfs_sb(s)->sb_was_error) {
  70                 if (hpfs_sb(s)->sb_err == 2) {
  71                         pr_cont("; crashing the system because you wanted it\n");
  72                         mark_dirty(s, 0);
  73                         panic("HPFS panic");
  74                 } else if (hpfs_sb(s)->sb_err == 1) {
  75                         if (s->s_flags & MS_RDONLY)
  76                                 pr_cont("; already mounted read-only\n");
  77                         else {
  78                                 pr_cont("; remounting read-only\n");
  79                                 mark_dirty(s, 0);
  80                                 s->s_flags |= MS_RDONLY;
  81                         }
  82                 } else if (s->s_flags & MS_RDONLY)
  83                                 pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
  84                 else
  85                         pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  86         } else
  87                 pr_cont("\n");
  88         hpfs_sb(s)->sb_was_error = 1;
  89 }
  90
  91 /*
  92  * A little trick to detect cycles in many hpfs structures and don't let the
  93  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
  94  *
  95  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
  96  * nested each in other, chkdsk locked up happilly.
  97  */
  98
  99 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
 100                 char *msg)
 101 {
 102         if (*c2 && *c1 == key) {
 103                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
 104                 return 1;
 105         }
 106         (*c2)++;
 107         if (!((*c2 - 1) & *c2)) *c1 = key;
 108         return 0;
 109 }
 110
 111 static void free_sbi(struct hpfs_sb_info *sbi)
 112 {
 113         kfree(sbi->sb_cp_table);
 114         kfree(sbi->sb_bmp_dir);
 115         kfree(sbi);
 116 }
 117
 118 static void lazy_free_sbi(struct rcu_head *rcu)
 119 {
 120         free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
 121 }
 122
 123 static void hpfs_put_super(struct super_block *s)
 124 {
 125         hpfs_lock(s);
 126         unmark_dirty(s);
 127         hpfs_unlock(s);
 128         call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
 129 }
 130
 131 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 132 {
 133         struct quad_buffer_head qbh;
 134         unsigned long *bits;
 135         unsigned count;
 136
 137         bits = hpfs_map_4sectors(s, secno, &qbh, 0);
 138         if (!bits)
 139                 return (unsigned)-1;
 140         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 141         hpfs_brelse4(&qbh);
 142         return count;
 143 }
 144
 145 static unsigned count_bitmaps(struct super_block *s)
 146 {
 147         unsigned n, count, n_bands;
 148         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 149         count = 0;
 150         for (n = 0; n < COUNT_RD_AHEAD; n++) {
 151                 hpfs_prefetch_bitmap(s, n);
 152         }
 153         for (n = 0; n < n_bands; n++) {
 154                 unsigned c;
 155                 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
 156                 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
 157                 if (c != (unsigned)-1)
 158                         count += c;
 159         }
 160         return count;
 161 }
 162
 163 unsigned hpfs_get_free_dnodes(struct super_block *s)
 164 {
 165         struct hpfs_sb_info *sbi = hpfs_sb(s);
 166         if (sbi->sb_n_free_dnodes == (unsigned)-1) {
 167                 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 168                 if (c == (unsigned)-1)
 169                         return 0;
 170                 sbi->sb_n_free_dnodes = c;
 171         }
 172         return sbi->sb_n_free_dnodes;
 173 }
 174
 175 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 176 {
 177         struct super_block *s = dentry->d_sb;
 178         struct hpfs_sb_info *sbi = hpfs_sb(s);
 179         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 180
 181         hpfs_lock(s);
 182
 183         if (sbi->sb_n_free == (unsigned)-1)
 184                 sbi->sb_n_free = count_bitmaps(s);
 185
 186         buf->f_type = s->s_magic;
 187         buf->f_bsize = 512;
 188         buf->f_blocks = sbi->sb_fs_size;
 189         buf->f_bfree = sbi->sb_n_free;
 190         buf->f_bavail = sbi->sb_n_free;
 191         buf->f_files = sbi->sb_dirband_size / 4;
 192         buf->f_ffree = hpfs_get_free_dnodes(s);
 193         buf->f_fsid.val[0] = (u32)id;
 194         buf->f_fsid.val[1] = (u32)(id >> 32);
 195         buf->f_namelen = 254;
 196
 197         hpfs_unlock(s);
 198
 199         return 0;
 200 }
 201
 202
 203 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 204 {
 205         switch (cmd) {
 206                 case FITRIM: {
 207                         struct fstrim_range range;
 208                         secno n_trimmed;
 209                         int r;
 210                         if (!capable(CAP_SYS_ADMIN))
 211                                 return -EPERM;
 212                         if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
 213                                 return -EFAULT;
 214                         r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed);
 215                         if (r)
 216                                 return r;
 217                         range.len = (u64)n_trimmed << 9;
 218                         if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
 219                                 return -EFAULT;
 220                         return 0;
 221                 }
 222                 default: {
 223                         return -ENOIOCTLCMD;
 224                 }
 225         }
 226 }
 227
 228
 229 static struct kmem_cache * hpfs_inode_cachep;
 230
 231 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 232 {
 233         struct hpfs_inode_info *ei;
 234         ei = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 235         if (!ei)
 236                 return NULL;
 237         ei->vfs_inode.i_version = 1;
 238         return &ei->vfs_inode;
 239 }
 240
 241 static void hpfs_i_callback(struct rcu_head *head)
 242 {
 243         struct inode *inode = container_of(head, struct inode, i_rcu);
 244         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 245 }
 246
 247 static void hpfs_destroy_inode(struct inode *inode)
 248 {
 249         call_rcu(&inode->i_rcu, hpfs_i_callback);
 250 }
 251
 252 static void init_once(void *foo)
 253 {
 254         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 255
 256         inode_init_once(&ei->vfs_inode);
 257 }
 258
 259 static int init_inodecache(void)
 260 {
 261         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 262                                              sizeof(struct hpfs_inode_info),
 263                                              0, (SLAB_RECLAIM_ACCOUNT|
 264                                                 SLAB_MEM_SPREAD),
 265                                              init_once);
 266         if (hpfs_inode_cachep == NULL)
 267                 return -ENOMEM;
 268         return 0;
 269 }
 270
 271 static void destroy_inodecache(void)
 272 {
 273         /*
 274          * Make sure all delayed rcu free inodes are flushed before we
 275          * destroy cache.
 276          */
 277         rcu_barrier();
 278         kmem_cache_destroy(hpfs_inode_cachep);
 279 }
 280
 281 /*
 282  * A tiny parser for option strings, stolen from dosfs.
 283  * Stolen again from read-only hpfs.
 284  * And updated for table-driven option parsing.
 285  */
 286
 287 enum {
 288         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 289         Opt_check_none, Opt_check_normal, Opt_check_strict,
 290         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 291         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 292         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 293         Opt_timeshift, Opt_err,
 294 };
 295
 296 static const match_table_t tokens = {
 297         {Opt_help, "help"},
 298         {Opt_uid, "uid=%u"},
 299         {Opt_gid, "gid=%u"},
 300         {Opt_umask, "umask=%o"},
 301         {Opt_case_lower, "case=lower"},
 302         {Opt_case_asis, "case=asis"},
 303         {Opt_check_none, "check=none"},
 304         {Opt_check_normal, "check=normal"},
 305         {Opt_check_strict, "check=strict"},
 306         {Opt_err_cont, "errors=continue"},
 307         {Opt_err_ro, "errors=remount-ro"},
 308         {Opt_err_panic, "errors=panic"},
 309         {Opt_eas_no, "eas=no"},
 310         {Opt_eas_ro, "eas=ro"},
 311         {Opt_eas_rw, "eas=rw"},
 312         {Opt_chkdsk_no, "chkdsk=no"},
 313         {Opt_chkdsk_errors, "chkdsk=errors"},
 314         {Opt_chkdsk_always, "chkdsk=always"},
 315         {Opt_timeshift, "timeshift=%d"},
 316         {Opt_err, NULL},
 317 };
 318
 319 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
 320                       int *lowercase, int *eas, int *chk, int *errs,
 321                       int *chkdsk, int *timeshift)
 322 {
 323         char *p;
 324         int option;
 325
 326         if (!opts)
 327                 return 1;
 328
 329         /*pr_info("Parsing opts: '%s'\n",opts);*/
 330
 331         while ((p = strsep(&opts, ",")) != NULL) {
 332                 substring_t args[MAX_OPT_ARGS];
 333                 int token;
 334                 if (!*p)
 335                         continue;
 336
 337                 token = match_token(p, tokens, args);
 338                 switch (token) {
 339                 case Opt_help:
 340                         return 2;
 341                 case Opt_uid:
 342                         if (match_int(args, &option))
 343                                 return 0;
 344                         *uid = make_kuid(current_user_ns(), option);
 345                         if (!uid_valid(*uid))
 346                                 return 0;
 347                         break;
 348                 case Opt_gid:
 349                         if (match_int(args, &option))
 350                                 return 0;
 351                         *gid = make_kgid(current_user_ns(), option);
 352                         if (!gid_valid(*gid))
 353                                 return 0;
 354                         break;
 355                 case Opt_umask:
 356                         if (match_octal(args, &option))
 357                                 return 0;
 358                         *umask = option;
 359                         break;
 360                 case Opt_case_lower:
 361                         *lowercase = 1;
 362                         break;
 363                 case Opt_case_asis:
 364                         *lowercase = 0;
 365                         break;
 366                 case Opt_check_none:
 367                         *chk = 0;
 368                         break;
 369                 case Opt_check_normal:
 370                         *chk = 1;
 371                         break;
 372                 case Opt_check_strict:
 373                         *chk = 2;
 374                         break;
 375                 case Opt_err_cont:
 376                         *errs = 0;
 377                         break;
 378                 case Opt_err_ro:
 379                         *errs = 1;
 380                         break;
 381                 case Opt_err_panic:
 382                         *errs = 2;
 383                         break;
 384                 case Opt_eas_no:
 385                         *eas = 0;
 386                         break;
 387                 case Opt_eas_ro:
 388                         *eas = 1;
 389                         break;
 390                 case Opt_eas_rw:
 391                         *eas = 2;
 392                         break;
 393                 case Opt_chkdsk_no:
 394                         *chkdsk = 0;
 395                         break;
 396                 case Opt_chkdsk_errors:
 397                         *chkdsk = 1;
 398                         break;
 399                 case Opt_chkdsk_always:
 400                         *chkdsk = 2;
 401                         break;
 402                 case Opt_timeshift:
 403                 {
 404                         int m = 1;
 405                         char *rhs = args[0].from;
 406                         if (!rhs || !*rhs)
 407                                 return 0;
 408                         if (*rhs == '-') m = -1;
 409                         if (*rhs == '+' || *rhs == '-') rhs++;
 410                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 411                         if (*rhs)
 412                                 return 0;
 413                         break;
 414                 }
 415                 default:
 416                         return 0;
 417                 }
 418         }
 419         return 1;
 420 }
 421
 422 static inline void hpfs_help(void)
 423 {
 424         pr_info("\n\
 425 HPFS filesystem options:\n\
 426       help              do not mount and display this text\n\
 427       uid=xxx           set uid of files that don't have uid specified in eas\n\
 428       gid=xxx           set gid of files that don't have gid specified in eas\n\
 429       umask=xxx         set mode of files that don't have mode specified in eas\n\
 430       case=lower        lowercase all files\n\
 431       case=asis         do not lowercase files (default)\n\
 432       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 433       check=normal      do some checks - it should not crash (default)\n\
 434       check=strict      do extra time-consuming checks, used for debugging\n\
 435       errors=continue   continue on errors\n\
 436       errors=remount-ro remount read-only if errors found (default)\n\
 437       errors=panic      panic on errors\n\
 438       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 439       chkdsk=errors     mark fs dirty if errors found (default)\n\
 440       chkdsk=always     always mark fs dirty - used for debugging\n\
 441       eas=no            ignore extended attributes\n\
 442       eas=ro            read but do not write extended attributes\n\
 443       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 444       timeshift=nnn     add nnn seconds to file times\n\
 445 \n");
 446 }
 447
 448 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 449 {
 450         kuid_t uid;
 451         kgid_t gid;
 452         umode_t umask;
 453         int lowercase, eas, chk, errs, chkdsk, timeshift;
 454         int o;
 455         struct hpfs_sb_info *sbi = hpfs_sb(s);
 456         char *new_opts = kstrdup(data, GFP_KERNEL);
 457
 458         if (!new_opts)
 459                 return -ENOMEM;
 460
 461         sync_filesystem(s);
 462
 463         *flags |= MS_NOATIME;
 464
 465         hpfs_lock(s);
 466         uid = sbi->sb_uid; gid = sbi->sb_gid;
 467         umask = 0777 & ~sbi->sb_mode;
 468         lowercase = sbi->sb_lowercase;
 469         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 470         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 471
 472         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 473             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 474                 pr_err("bad mount options.\n");
 475                 goto out_err;
 476         }
 477         if (o == 2) {
 478                 hpfs_help();
 479                 goto out_err;
 480         }
 481         if (timeshift != sbi->sb_timeshift) {
 482                 pr_err("timeshift can't be changed using remount.\n");
 483                 goto out_err;
 484         }
 485
 486         unmark_dirty(s);
 487
 488         sbi->sb_uid = uid; sbi->sb_gid = gid;
 489         sbi->sb_mode = 0777 & ~umask;
 490         sbi->sb_lowercase = lowercase;
 491         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 492         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 493
 494         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
 495
 496         replace_mount_options(s, new_opts);
 497
 498         hpfs_unlock(s);
 499         return 0;
 500
 501 out_err:
 502         hpfs_unlock(s);
 503         kfree(new_opts);
 504         return -EINVAL;
 505 }
 506
 507 /* Super operations */
 508
 509 static const struct super_operations hpfs_sops =
 510 {
 511         .alloc_inode    = hpfs_alloc_inode,
 512         .destroy_inode  = hpfs_destroy_inode,
 513         .evict_inode    = hpfs_evict_inode,
 514         .put_super      = hpfs_put_super,
 515         .statfs         = hpfs_statfs,
 516         .remount_fs     = hpfs_remount_fs,
 517         .show_options   = generic_show_options,
 518 };
 519
 520 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 521 {
 522         struct buffer_head *bh0, *bh1, *bh2;
 523         struct hpfs_boot_block *bootblock;
 524         struct hpfs_super_block *superblock;
 525         struct hpfs_spare_block *spareblock;
 526         struct hpfs_sb_info *sbi;
 527         struct inode *root;
 528
 529         kuid_t uid;
 530         kgid_t gid;
 531         umode_t umask;
 532         int lowercase, eas, chk, errs, chkdsk, timeshift;
 533
 534         dnode_secno root_dno;
 535         struct hpfs_dirent *de = NULL;
 536         struct quad_buffer_head qbh;
 537
 538         int o;
 539
 540         save_mount_options(s, options);
 541
 542         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 543         if (!sbi) {
 544                 return -ENOMEM;
 545         }
 546         s->s_fs_info = sbi;
 547
 548         mutex_init(&sbi->hpfs_mutex);
 549         hpfs_lock(s);
 550
 551         uid = current_uid();
 552         gid = current_gid();
 553         umask = current_umask();
 554         lowercase = 0;
 555         eas = 2;
 556         chk = 1;
 557         errs = 1;
 558         chkdsk = 1;
 559         timeshift = 0;
 560
 561         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
 562             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 563                 pr_err("bad mount options.\n");
 564                 goto bail0;
 565         }
 566         if (o==2) {
 567                 hpfs_help();
 568                 goto bail0;
 569         }
 570
 571         /*sbi->sb_mounting = 1;*/
 572         sb_set_blocksize(s, 512);
 573         sbi->sb_fs_size = -1;
 574         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 575         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 576         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 577
 578         /* Check magics */
 579         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 580             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 581             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
 582                 if (!silent)
 583                         pr_err("Bad magic ... probably not HPFS\n");
 584                 goto bail4;
 585         }
 586
 587         /* Check version */
 588         if (!(s->s_flags & MS_RDONLY) &&
 589               superblock->funcversion != 2 && superblock->funcversion != 3) {
 590                 pr_err("Bad version %d,%d. Mount readonly to go around\n",
 591                         (int)superblock->version, (int)superblock->funcversion);
 592                 pr_err("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");
 593                 goto bail4;
 594         }
 595
 596         s->s_flags |= MS_NOATIME;
 597
 598         /* Fill superblock stuff */
 599         s->s_magic = HPFS_SUPER_MAGIC;
 600         s->s_op = &hpfs_sops;
 601         s->s_d_op = &hpfs_dentry_operations;
 602
 603         sbi->sb_root = le32_to_cpu(superblock->root);
 604         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 605         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 606         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 607         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 608         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 609         sbi->sb_uid = uid;
 610         sbi->sb_gid = gid;
 611         sbi->sb_mode = 0777 & ~umask;
 612         sbi->sb_n_free = -1;
 613         sbi->sb_n_free_dnodes = -1;
 614         sbi->sb_lowercase = lowercase;
 615         sbi->sb_eas = eas;
 616         sbi->sb_chk = chk;
 617         sbi->sb_chkdsk = chkdsk;
 618         sbi->sb_err = errs;
 619         sbi->sb_timeshift = timeshift;
 620         sbi->sb_was_error = 0;
 621         sbi->sb_cp_table = NULL;
 622         sbi->sb_c_bitmap = -1;
 623         sbi->sb_max_fwd_alloc = 0xffffff;
 624
 625         if (sbi->sb_fs_size >= 0x80000000) {
 626                 hpfs_error(s, "invalid size in superblock: %08x",
 627                         (unsigned)sbi->sb_fs_size);
 628                 goto bail4;
 629         }
 630
 631         /* Load bitmap directory */
 632         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 633                 goto bail4;
 634
 635         /* Check for general fs errors*/
 636         if (spareblock->dirty && !spareblock->old_wrote) {
 637                 if (errs == 2) {
 638                         pr_err("Improperly stopped, not mounted\n");
 639                         goto bail4;
 640                 }
 641                 hpfs_error(s, "improperly stopped");
 642         }
 643
 644         if (!(s->s_flags & MS_RDONLY)) {
 645                 spareblock->dirty = 1;
 646                 spareblock->old_wrote = 0;
 647                 mark_buffer_dirty(bh2);
 648         }
 649
 650         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 651                 if (errs >= 2) {
 652                         pr_err("Hotfixes not supported here, try chkdsk\n");
 653                         mark_dirty(s, 0);
 654                         goto bail4;
 655                 }
 656                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 657                 if (errs == 0)
 658                         pr_err("Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 659                 else
 660                         pr_err("This driver may read bad files or crash when operating on disk with hotfixes.\n");
 661         }
 662         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 663                 if (errs >= 2) {
 664                         pr_err("Spare dnodes used, try chkdsk\n");
 665                         mark_dirty(s, 0);
 666                         goto bail4;
 667                 }
 668                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 669                 if (errs == 0)
 670                         pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 671         }
 672         if (chk) {
 673                 unsigned a;
 674                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 675                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 676                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 677                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 678                         goto bail4;
 679                 }
 680                 a = sbi->sb_dirband_size;
 681                 sbi->sb_dirband_size = 0;
 682                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 683                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 684                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 685                         mark_dirty(s, 0);
 686                         goto bail4;
 687                 }
 688                 sbi->sb_dirband_size = a;
 689         } else
 690                 pr_err("You really don't want any checks? You are crazy...\n");
 691
 692         /* Load code page table */
 693         if (le32_to_cpu(spareblock->n_code_pages))
 694                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 695                         pr_err("code page support is disabled\n");
 696
 697         brelse(bh2);
 698         brelse(bh1);
 699         brelse(bh0);
 700
 701         root = iget_locked(s, sbi->sb_root);
 702         if (!root)
 703                 goto bail0;
 704         hpfs_init_inode(root);
 705         hpfs_read_inode(root);
 706         unlock_new_inode(root);
 707         s->s_root = d_make_root(root);
 708         if (!s->s_root)
 709                 goto bail0;
 710
 711         /*
 712          * find the root directory's . pointer & finish filling in the inode
 713          */
 714
 715         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 716         if (root_dno)
 717                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 718         if (!de)
 719                 hpfs_error(s, "unable to find root dir");
 720         else {
 721                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 722                 root->i_atime.tv_nsec = 0;
 723                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 724                 root->i_mtime.tv_nsec = 0;
 725                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 726                 root->i_ctime.tv_nsec = 0;
 727                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
 728                 hpfs_i(root)->i_parent_dir = root->i_ino;
 729                 if (root->i_size == -1)
 730                         root->i_size = 2048;
 731                 if (root->i_blocks == -1)
 732                         root->i_blocks = 5;
 733                 hpfs_brelse4(&qbh);
 734         }
 735         hpfs_unlock(s);
 736         return 0;
 737
 738 bail4:  brelse(bh2);
 739 bail3:  brelse(bh1);
 740 bail2:  brelse(bh0);
 741 bail1:
 742 bail0:
 743         hpfs_unlock(s);
 744         free_sbi(sbi);
 745         return -EINVAL;
 746 }
 747
 748 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 749         int flags, const char *dev_name, void *data)
 750 {
 751         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 752 }
 753
 754 static struct file_system_type hpfs_fs_type = {
 755         .owner          = THIS_MODULE,
 756         .name           = "hpfs",
 757         .mount          = hpfs_mount,
 758         .kill_sb        = kill_block_super,
 759         .fs_flags       = FS_REQUIRES_DEV,
 760 };
 761 MODULE_ALIAS_FS("hpfs");
 762
 763 static int __init init_hpfs_fs(void)
 764 {
 765         int err = init_inodecache();
 766         if (err)
 767                 goto out1;
 768         err = register_filesystem(&hpfs_fs_type);
 769         if (err)
 770                 goto out;
 771         return 0;
 772 out:
 773         destroy_inodecache();
 774 out1:
 775         return err;
 776 }
 777
 778 static void __exit exit_hpfs_fs(void)
 779 {
 780         unregister_filesystem(&hpfs_fs_type);
 781         destroy_inodecache();
 782 }
 783
 784 module_init(init_hpfs_fs)
 785 module_exit(exit_hpfs_fs)
 786 MODULE_LICENSE("GPL");