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 #include <linux/seq_file.h>
  19
  20 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
  21
  22 static void mark_dirty(struct super_block *s, int remount)
  23 {
  24         if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) {
  25                 struct buffer_head *bh;
  26                 struct hpfs_spare_block *sb;
  27                 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  28                         sb->dirty = 1;
  29                         sb->old_wrote = 0;
  30                         mark_buffer_dirty(bh);
  31                         sync_dirty_buffer(bh);
  32                         brelse(bh);
  33                 }
  34         }
  35 }
  36
  37 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
  38    were errors) */
  39
  40 static void unmark_dirty(struct super_block *s)
  41 {
  42         struct buffer_head *bh;
  43         struct hpfs_spare_block *sb;
  44         if (sb_rdonly(s)) return;
  45         sync_blockdev(s->s_bdev);
  46         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  47                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
  48                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
  49                 mark_buffer_dirty(bh);
  50                 sync_dirty_buffer(bh);
  51                 brelse(bh);
  52         }
  53 }
  54
  55 /* Filesystem error... */
  56 void hpfs_error(struct super_block *s, const char *fmt, ...)
  57 {
  58         struct va_format vaf;
  59         va_list args;
  60
  61         va_start(args, fmt);
  62
  63         vaf.fmt = fmt;
  64         vaf.va = &args;
  65
  66         pr_err("filesystem error: %pV", &vaf);
  67
  68         va_end(args);
  69
  70         if (!hpfs_sb(s)->sb_was_error) {
  71                 if (hpfs_sb(s)->sb_err == 2) {
  72                         pr_cont("; crashing the system because you wanted it\n");
  73                         mark_dirty(s, 0);
  74                         panic("HPFS panic");
  75                 } else if (hpfs_sb(s)->sb_err == 1) {
  76                         if (sb_rdonly(s))
  77                                 pr_cont("; already mounted read-only\n");
  78                         else {
  79                                 pr_cont("; remounting read-only\n");
  80                                 mark_dirty(s, 0);
  81                                 s->s_flags |= SB_RDONLY;
  82                         }
  83                 } else if (sb_rdonly(s))
  84                                 pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
  85                 else
  86                         pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  87         } else
  88                 pr_cont("\n");
  89         hpfs_sb(s)->sb_was_error = 1;
  90 }
  91
  92 /*
  93  * A little trick to detect cycles in many hpfs structures and don't let the
  94  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
  95  *
  96  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
  97  * nested each in other, chkdsk locked up happilly.
  98  */
  99
 100 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
 101                 char *msg)
 102 {
 103         if (*c2 && *c1 == key) {
 104                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
 105                 return 1;
 106         }
 107         (*c2)++;
 108         if (!((*c2 - 1) & *c2)) *c1 = key;
 109         return 0;
 110 }
 111
 112 static void free_sbi(struct hpfs_sb_info *sbi)
 113 {
 114         kfree(sbi->sb_cp_table);
 115         kfree(sbi->sb_bmp_dir);
 116         kfree(sbi);
 117 }
 118
 119 static void lazy_free_sbi(struct rcu_head *rcu)
 120 {
 121         free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
 122 }
 123
 124 static void hpfs_put_super(struct super_block *s)
 125 {
 126         hpfs_lock(s);
 127         unmark_dirty(s);
 128         hpfs_unlock(s);
 129         call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
 130 }
 131
 132 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 133 {
 134         struct quad_buffer_head qbh;
 135         unsigned long *bits;
 136         unsigned count;
 137
 138         bits = hpfs_map_4sectors(s, secno, &qbh, 0);
 139         if (!bits)
 140                 return (unsigned)-1;
 141         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 142         hpfs_brelse4(&qbh);
 143         return count;
 144 }
 145
 146 static unsigned count_bitmaps(struct super_block *s)
 147 {
 148         unsigned n, count, n_bands;
 149         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 150         count = 0;
 151         for (n = 0; n < COUNT_RD_AHEAD; n++) {
 152                 hpfs_prefetch_bitmap(s, n);
 153         }
 154         for (n = 0; n < n_bands; n++) {
 155                 unsigned c;
 156                 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
 157                 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
 158                 if (c != (unsigned)-1)
 159                         count += c;
 160         }
 161         return count;
 162 }
 163
 164 unsigned hpfs_get_free_dnodes(struct super_block *s)
 165 {
 166         struct hpfs_sb_info *sbi = hpfs_sb(s);
 167         if (sbi->sb_n_free_dnodes == (unsigned)-1) {
 168                 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 169                 if (c == (unsigned)-1)
 170                         return 0;
 171                 sbi->sb_n_free_dnodes = c;
 172         }
 173         return sbi->sb_n_free_dnodes;
 174 }
 175
 176 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 177 {
 178         struct super_block *s = dentry->d_sb;
 179         struct hpfs_sb_info *sbi = hpfs_sb(s);
 180         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 181
 182         hpfs_lock(s);
 183
 184         if (sbi->sb_n_free == (unsigned)-1)
 185                 sbi->sb_n_free = count_bitmaps(s);
 186
 187         buf->f_type = s->s_magic;
 188         buf->f_bsize = 512;
 189         buf->f_blocks = sbi->sb_fs_size;
 190         buf->f_bfree = sbi->sb_n_free;
 191         buf->f_bavail = sbi->sb_n_free;
 192         buf->f_files = sbi->sb_dirband_size / 4;
 193         buf->f_ffree = hpfs_get_free_dnodes(s);
 194         buf->f_fsid.val[0] = (u32)id;
 195         buf->f_fsid.val[1] = (u32)(id >> 32);
 196         buf->f_namelen = 254;
 197
 198         hpfs_unlock(s);
 199
 200         return 0;
 201 }
 202
 203
 204 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 205 {
 206         switch (cmd) {
 207                 case FITRIM: {
 208                         struct fstrim_range range;
 209                         secno n_trimmed;
 210                         int r;
 211                         if (!capable(CAP_SYS_ADMIN))
 212                                 return -EPERM;
 213                         if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
 214                                 return -EFAULT;
 215                         r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed);
 216                         if (r)
 217                                 return r;
 218                         range.len = (u64)n_trimmed << 9;
 219                         if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
 220                                 return -EFAULT;
 221                         return 0;
 222                 }
 223                 default: {
 224                         return -ENOIOCTLCMD;
 225                 }
 226         }
 227 }
 228
 229
 230 static struct kmem_cache * hpfs_inode_cachep;
 231
 232 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 233 {
 234         struct hpfs_inode_info *ei;
 235         ei = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 236         if (!ei)
 237                 return NULL;
 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|SLAB_ACCOUNT),
 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
 457         sync_filesystem(s);
 458
 459         *flags |= SB_NOATIME;
 460
 461         hpfs_lock(s);
 462         uid = sbi->sb_uid; gid = sbi->sb_gid;
 463         umask = 0777 & ~sbi->sb_mode;
 464         lowercase = sbi->sb_lowercase;
 465         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 466         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 467
 468         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 469             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 470                 pr_err("bad mount options.\n");
 471                 goto out_err;
 472         }
 473         if (o == 2) {
 474                 hpfs_help();
 475                 goto out_err;
 476         }
 477         if (timeshift != sbi->sb_timeshift) {
 478                 pr_err("timeshift can't be changed using remount.\n");
 479                 goto out_err;
 480         }
 481
 482         unmark_dirty(s);
 483
 484         sbi->sb_uid = uid; sbi->sb_gid = gid;
 485         sbi->sb_mode = 0777 & ~umask;
 486         sbi->sb_lowercase = lowercase;
 487         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 488         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 489
 490         if (!(*flags & SB_RDONLY)) mark_dirty(s, 1);
 491
 492         hpfs_unlock(s);
 493         return 0;
 494
 495 out_err:
 496         hpfs_unlock(s);
 497         return -EINVAL;
 498 }
 499
 500 static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
 501 {
 502         struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
 503
 504         seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
 505         seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
 506         seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
 507         if (sbi->sb_lowercase)
 508                 seq_printf(seq, ",case=lower");
 509         if (!sbi->sb_chk)
 510                 seq_printf(seq, ",check=none");
 511         if (sbi->sb_chk == 2)
 512                 seq_printf(seq, ",check=strict");
 513         if (!sbi->sb_err)
 514                 seq_printf(seq, ",errors=continue");
 515         if (sbi->sb_err == 2)
 516                 seq_printf(seq, ",errors=panic");
 517         if (!sbi->sb_chkdsk)
 518                 seq_printf(seq, ",chkdsk=no");
 519         if (sbi->sb_chkdsk == 2)
 520                 seq_printf(seq, ",chkdsk=always");
 521         if (!sbi->sb_eas)
 522                 seq_printf(seq, ",eas=no");
 523         if (sbi->sb_eas == 1)
 524                 seq_printf(seq, ",eas=ro");
 525         if (sbi->sb_timeshift)
 526                 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
 527         return 0;
 528 }
 529
 530 /* Super operations */
 531
 532 static const struct super_operations hpfs_sops =
 533 {
 534         .alloc_inode    = hpfs_alloc_inode,
 535         .destroy_inode  = hpfs_destroy_inode,
 536         .evict_inode    = hpfs_evict_inode,
 537         .put_super      = hpfs_put_super,
 538         .statfs         = hpfs_statfs,
 539         .remount_fs     = hpfs_remount_fs,
 540         .show_options   = hpfs_show_options,
 541 };
 542
 543 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 544 {
 545         struct buffer_head *bh0, *bh1, *bh2;
 546         struct hpfs_boot_block *bootblock;
 547         struct hpfs_super_block *superblock;
 548         struct hpfs_spare_block *spareblock;
 549         struct hpfs_sb_info *sbi;
 550         struct inode *root;
 551
 552         kuid_t uid;
 553         kgid_t gid;
 554         umode_t umask;
 555         int lowercase, eas, chk, errs, chkdsk, timeshift;
 556
 557         dnode_secno root_dno;
 558         struct hpfs_dirent *de = NULL;
 559         struct quad_buffer_head qbh;
 560
 561         int o;
 562
 563         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 564         if (!sbi) {
 565                 return -ENOMEM;
 566         }
 567         s->s_fs_info = sbi;
 568
 569         mutex_init(&sbi->hpfs_mutex);
 570         hpfs_lock(s);
 571
 572         uid = current_uid();
 573         gid = current_gid();
 574         umask = current_umask();
 575         lowercase = 0;
 576         eas = 2;
 577         chk = 1;
 578         errs = 1;
 579         chkdsk = 1;
 580         timeshift = 0;
 581
 582         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
 583             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 584                 pr_err("bad mount options.\n");
 585                 goto bail0;
 586         }
 587         if (o==2) {
 588                 hpfs_help();
 589                 goto bail0;
 590         }
 591
 592         /*sbi->sb_mounting = 1;*/
 593         sb_set_blocksize(s, 512);
 594         sbi->sb_fs_size = -1;
 595         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 596         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 597         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 598
 599         /* Check magics */
 600         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 601             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 602             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
 603                 if (!silent)
 604                         pr_err("Bad magic ... probably not HPFS\n");
 605                 goto bail4;
 606         }
 607
 608         /* Check version */
 609         if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) {
 610                 pr_err("Bad version %d,%d. Mount readonly to go around\n",
 611                         (int)superblock->version, (int)superblock->funcversion);
 612                 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");
 613                 goto bail4;
 614         }
 615
 616         s->s_flags |= SB_NOATIME;
 617
 618         /* Fill superblock stuff */
 619         s->s_magic = HPFS_SUPER_MAGIC;
 620         s->s_op = &hpfs_sops;
 621         s->s_d_op = &hpfs_dentry_operations;
 622
 623         sbi->sb_root = le32_to_cpu(superblock->root);
 624         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 625         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 626         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 627         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 628         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 629         sbi->sb_uid = uid;
 630         sbi->sb_gid = gid;
 631         sbi->sb_mode = 0777 & ~umask;
 632         sbi->sb_n_free = -1;
 633         sbi->sb_n_free_dnodes = -1;
 634         sbi->sb_lowercase = lowercase;
 635         sbi->sb_eas = eas;
 636         sbi->sb_chk = chk;
 637         sbi->sb_chkdsk = chkdsk;
 638         sbi->sb_err = errs;
 639         sbi->sb_timeshift = timeshift;
 640         sbi->sb_was_error = 0;
 641         sbi->sb_cp_table = NULL;
 642         sbi->sb_c_bitmap = -1;
 643         sbi->sb_max_fwd_alloc = 0xffffff;
 644
 645         if (sbi->sb_fs_size >= 0x80000000) {
 646                 hpfs_error(s, "invalid size in superblock: %08x",
 647                         (unsigned)sbi->sb_fs_size);
 648                 goto bail4;
 649         }
 650
 651         if (spareblock->n_spares_used)
 652                 hpfs_load_hotfix_map(s, spareblock);
 653
 654         /* Load bitmap directory */
 655         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 656                 goto bail4;
 657
 658         /* Check for general fs errors*/
 659         if (spareblock->dirty && !spareblock->old_wrote) {
 660                 if (errs == 2) {
 661                         pr_err("Improperly stopped, not mounted\n");
 662                         goto bail4;
 663                 }
 664                 hpfs_error(s, "improperly stopped");
 665         }
 666
 667         if (!sb_rdonly(s)) {
 668                 spareblock->dirty = 1;
 669                 spareblock->old_wrote = 0;
 670                 mark_buffer_dirty(bh2);
 671         }
 672
 673         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 674                 if (errs >= 2) {
 675                         pr_err("Spare dnodes used, try chkdsk\n");
 676                         mark_dirty(s, 0);
 677                         goto bail4;
 678                 }
 679                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 680                 if (errs == 0)
 681                         pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 682         }
 683         if (chk) {
 684                 unsigned a;
 685                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 686                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 687                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 688                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 689                         goto bail4;
 690                 }
 691                 a = sbi->sb_dirband_size;
 692                 sbi->sb_dirband_size = 0;
 693                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 694                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 695                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 696                         mark_dirty(s, 0);
 697                         goto bail4;
 698                 }
 699                 sbi->sb_dirband_size = a;
 700         } else
 701                 pr_err("You really don't want any checks? You are crazy...\n");
 702
 703         /* Load code page table */
 704         if (le32_to_cpu(spareblock->n_code_pages))
 705                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 706                         pr_err("code page support is disabled\n");
 707
 708         brelse(bh2);
 709         brelse(bh1);
 710         brelse(bh0);
 711
 712         root = iget_locked(s, sbi->sb_root);
 713         if (!root)
 714                 goto bail0;
 715         hpfs_init_inode(root);
 716         hpfs_read_inode(root);
 717         unlock_new_inode(root);
 718         s->s_root = d_make_root(root);
 719         if (!s->s_root)
 720                 goto bail0;
 721
 722         /*
 723          * find the root directory's . pointer & finish filling in the inode
 724          */
 725
 726         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 727         if (root_dno)
 728                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 729         if (!de)
 730                 hpfs_error(s, "unable to find root dir");
 731         else {
 732                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 733                 root->i_atime.tv_nsec = 0;
 734                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 735                 root->i_mtime.tv_nsec = 0;
 736                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 737                 root->i_ctime.tv_nsec = 0;
 738                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
 739                 hpfs_i(root)->i_parent_dir = root->i_ino;
 740                 if (root->i_size == -1)
 741                         root->i_size = 2048;
 742                 if (root->i_blocks == -1)
 743                         root->i_blocks = 5;
 744                 hpfs_brelse4(&qbh);
 745         }
 746         hpfs_unlock(s);
 747         return 0;
 748
 749 bail4:  brelse(bh2);
 750 bail3:  brelse(bh1);
 751 bail2:  brelse(bh0);
 752 bail1:
 753 bail0:
 754         hpfs_unlock(s);
 755         free_sbi(sbi);
 756         return -EINVAL;
 757 }
 758
 759 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 760         int flags, const char *dev_name, void *data)
 761 {
 762         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 763 }
 764
 765 static struct file_system_type hpfs_fs_type = {
 766         .owner          = THIS_MODULE,
 767         .name           = "hpfs",
 768         .mount          = hpfs_mount,
 769         .kill_sb        = kill_block_super,
 770         .fs_flags       = FS_REQUIRES_DEV,
 771 };
 772 MODULE_ALIAS_FS("hpfs");
 773
 774 static int __init init_hpfs_fs(void)
 775 {
 776         int err = init_inodecache();
 777         if (err)
 778                 goto out1;
 779         err = register_filesystem(&hpfs_fs_type);
 780         if (err)
 781                 goto out;
 782         return 0;
 783 out:
 784         destroy_inodecache();
 785 out1:
 786         return err;
 787 }
 788
 789 static void __exit exit_hpfs_fs(void)
 790 {
 791         unregister_filesystem(&hpfs_fs_type);
 792         destroy_inodecache();
 793 }
 794
 795 module_init(init_hpfs_fs)
 796 module_exit(exit_hpfs_fs)
 797 MODULE_LICENSE("GPL");