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