fs/hpfs/super.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/fs/hpfs/super.c
   4  *
   5  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   6  *
   7  *  mounting, unmounting, error handling
   8  */
   9
  10 #include "hpfs_fn.h"
  11 #include <linux/module.h>
  12 #include <linux/parser.h>
  13 #include <linux/init.h>
  14 #include <linux/statfs.h>
  15 #include <linux/magic.h>
  16 #include <linux/sched.h>
  17 #include <linux/bitmap.h>
  18 #include <linux/slab.h>
  19 #include <linux/seq_file.h>
  20
  21 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
  22
  23 static void mark_dirty(struct super_block *s, int remount)
  24 {
  25         if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) {
  26                 struct buffer_head *bh;
  27                 struct hpfs_spare_block *sb;
  28                 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  29                         sb->dirty = 1;
  30                         sb->old_wrote = 0;
  31                         mark_buffer_dirty(bh);
  32                         sync_dirty_buffer(bh);
  33                         brelse(bh);
  34                 }
  35         }
  36 }
  37
  38 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
  39    were errors) */
  40
  41 static void unmark_dirty(struct super_block *s)
  42 {
  43         struct buffer_head *bh;
  44         struct hpfs_spare_block *sb;
  45         if (sb_rdonly(s)) return;
  46         sync_blockdev(s->s_bdev);
  47         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  48                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
  49                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
  50                 mark_buffer_dirty(bh);
  51                 sync_dirty_buffer(bh);
  52                 brelse(bh);
  53         }
  54 }
  55
  56 /* Filesystem error... */
  57 void hpfs_error(struct super_block *s, const char *fmt, ...)
  58 {
  59         struct va_format vaf;
  60         va_list args;
  61
  62         va_start(args, fmt);
  63
  64         vaf.fmt = fmt;
  65         vaf.va = &args;
  66
  67         pr_err("filesystem error: %pV", &vaf);
  68
  69         va_end(args);
  70
  71         if (!hpfs_sb(s)->sb_was_error) {
  72                 if (hpfs_sb(s)->sb_err == 2) {
  73                         pr_cont("; crashing the system because you wanted it\n");
  74                         mark_dirty(s, 0);
  75                         panic("HPFS panic");
  76                 } else if (hpfs_sb(s)->sb_err == 1) {
  77                         if (sb_rdonly(s))
  78                                 pr_cont("; already mounted read-only\n");
  79                         else {
  80                                 pr_cont("; remounting read-only\n");
  81                                 mark_dirty(s, 0);
  82                                 s->s_flags |= SB_RDONLY;
  83                         }
  84                 } else if (sb_rdonly(s))
  85                                 pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
  86                 else
  87                         pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  88         } else
  89                 pr_cont("\n");
  90         hpfs_sb(s)->sb_was_error = 1;
  91 }
  92
  93 /*
  94  * A little trick to detect cycles in many hpfs structures and don't let the
  95  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
  96  *
  97  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
  98  * nested each in other, chkdsk locked up happilly.
  99  */
 100
 101 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
 102                 char *msg)
 103 {
 104         if (*c2 && *c1 == key) {
 105                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
 106                 return 1;
 107         }
 108         (*c2)++;
 109         if (!((*c2 - 1) & *c2)) *c1 = key;
 110         return 0;
 111 }
 112
 113 static void free_sbi(struct hpfs_sb_info *sbi)
 114 {
 115         kfree(sbi->sb_cp_table);
 116         kfree(sbi->sb_bmp_dir);
 117         kfree(sbi);
 118 }
 119
 120 static void lazy_free_sbi(struct rcu_head *rcu)
 121 {
 122         free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
 123 }
 124
 125 static void hpfs_put_super(struct super_block *s)
 126 {
 127         hpfs_lock(s);
 128         unmark_dirty(s);
 129         hpfs_unlock(s);
 130         call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
 131 }
 132
 133 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 134 {
 135         struct quad_buffer_head qbh;
 136         unsigned long *bits;
 137         unsigned count;
 138
 139         bits = hpfs_map_4sectors(s, secno, &qbh, 0);
 140         if (!bits)
 141                 return (unsigned)-1;
 142         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 143         hpfs_brelse4(&qbh);
 144         return count;
 145 }
 146
 147 static unsigned count_bitmaps(struct super_block *s)
 148 {
 149         unsigned n, count, n_bands;
 150         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 151         count = 0;
 152         for (n = 0; n < COUNT_RD_AHEAD; n++) {
 153                 hpfs_prefetch_bitmap(s, n);
 154         }
 155         for (n = 0; n < n_bands; n++) {
 156                 unsigned c;
 157                 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
 158                 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
 159                 if (c != (unsigned)-1)
 160                         count += c;
 161         }
 162         return count;
 163 }
 164
 165 unsigned hpfs_get_free_dnodes(struct super_block *s)
 166 {
 167         struct hpfs_sb_info *sbi = hpfs_sb(s);
 168         if (sbi->sb_n_free_dnodes == (unsigned)-1) {
 169                 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 170                 if (c == (unsigned)-1)
 171                         return 0;
 172                 sbi->sb_n_free_dnodes = c;
 173         }
 174         return sbi->sb_n_free_dnodes;
 175 }
 176
 177 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 178 {
 179         struct super_block *s = dentry->d_sb;
 180         struct hpfs_sb_info *sbi = hpfs_sb(s);
 181         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 182
 183         hpfs_lock(s);
 184
 185         if (sbi->sb_n_free == (unsigned)-1)
 186                 sbi->sb_n_free = count_bitmaps(s);
 187
 188         buf->f_type = s->s_magic;
 189         buf->f_bsize = 512;
 190         buf->f_blocks = sbi->sb_fs_size;
 191         buf->f_bfree = sbi->sb_n_free;
 192         buf->f_bavail = sbi->sb_n_free;
 193         buf->f_files = sbi->sb_dirband_size / 4;
 194         buf->f_ffree = hpfs_get_free_dnodes(s);
 195         buf->f_fsid.val[0] = (u32)id;
 196         buf->f_fsid.val[1] = (u32)(id >> 32);
 197         buf->f_namelen = 254;
 198
 199         hpfs_unlock(s);
 200
 201         return 0;
 202 }
 203
 204
 205 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 206 {
 207         switch (cmd) {
 208                 case FITRIM: {
 209                         struct fstrim_range range;
 210                         secno n_trimmed;
 211                         int r;
 212                         if (!capable(CAP_SYS_ADMIN))
 213                                 return -EPERM;
 214                         if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
 215                                 return -EFAULT;
 216                         r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed);
 217                         if (r)
 218                                 return r;
 219                         range.len = (u64)n_trimmed << 9;
 220                         if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
 221                                 return -EFAULT;
 222                         return 0;
 223                 }
 224                 default: {
 225                         return -ENOIOCTLCMD;
 226                 }
 227         }
 228 }
 229
 230
 231 static struct kmem_cache * hpfs_inode_cachep;
 232
 233 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 234 {
 235         struct hpfs_inode_info *ei;
 236         ei = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 237         if (!ei)
 238                 return NULL;
 239         return &ei->vfs_inode;
 240 }
 241
 242 static void hpfs_free_inode(struct inode *inode)
 243 {
 244         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 245 }
 246
 247 static void init_once(void *foo)
 248 {
 249         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 250
 251         inode_init_once(&ei->vfs_inode);
 252 }
 253
 254 static int init_inodecache(void)
 255 {
 256         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 257                                              sizeof(struct hpfs_inode_info),
 258                                              0, (SLAB_RECLAIM_ACCOUNT|
 259                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
 260                                              init_once);
 261         if (hpfs_inode_cachep == NULL)
 262                 return -ENOMEM;
 263         return 0;
 264 }
 265
 266 static void destroy_inodecache(void)
 267 {
 268         /*
 269          * Make sure all delayed rcu free inodes are flushed before we
 270          * destroy cache.
 271          */
 272         rcu_barrier();
 273         kmem_cache_destroy(hpfs_inode_cachep);
 274 }
 275
 276 /*
 277  * A tiny parser for option strings, stolen from dosfs.
 278  * Stolen again from read-only hpfs.
 279  * And updated for table-driven option parsing.
 280  */
 281
 282 enum {
 283         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 284         Opt_check_none, Opt_check_normal, Opt_check_strict,
 285         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 286         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 287         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 288         Opt_timeshift, Opt_err,
 289 };
 290
 291 static const match_table_t tokens = {
 292         {Opt_help, "help"},
 293         {Opt_uid, "uid=%u"},
 294         {Opt_gid, "gid=%u"},
 295         {Opt_umask, "umask=%o"},
 296         {Opt_case_lower, "case=lower"},
 297         {Opt_case_asis, "case=asis"},
 298         {Opt_check_none, "check=none"},
 299         {Opt_check_normal, "check=normal"},
 300         {Opt_check_strict, "check=strict"},
 301         {Opt_err_cont, "errors=continue"},
 302         {Opt_err_ro, "errors=remount-ro"},
 303         {Opt_err_panic, "errors=panic"},
 304         {Opt_eas_no, "eas=no"},
 305         {Opt_eas_ro, "eas=ro"},
 306         {Opt_eas_rw, "eas=rw"},
 307         {Opt_chkdsk_no, "chkdsk=no"},
 308         {Opt_chkdsk_errors, "chkdsk=errors"},
 309         {Opt_chkdsk_always, "chkdsk=always"},
 310         {Opt_timeshift, "timeshift=%d"},
 311         {Opt_err, NULL},
 312 };
 313
 314 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
 315                       int *lowercase, int *eas, int *chk, int *errs,
 316                       int *chkdsk, int *timeshift)
 317 {
 318         char *p;
 319         int option;
 320
 321         if (!opts)
 322                 return 1;
 323
 324         /*pr_info("Parsing opts: '%s'\n",opts);*/
 325
 326         while ((p = strsep(&opts, ",")) != NULL) {
 327                 substring_t args[MAX_OPT_ARGS];
 328                 int token;
 329                 if (!*p)
 330                         continue;
 331
 332                 token = match_token(p, tokens, args);
 333                 switch (token) {
 334                 case Opt_help:
 335                         return 2;
 336                 case Opt_uid:
 337                         if (match_int(args, &option))
 338                                 return 0;
 339                         *uid = make_kuid(current_user_ns(), option);
 340                         if (!uid_valid(*uid))
 341                                 return 0;
 342                         break;
 343                 case Opt_gid:
 344                         if (match_int(args, &option))
 345                                 return 0;
 346                         *gid = make_kgid(current_user_ns(), option);
 347                         if (!gid_valid(*gid))
 348                                 return 0;
 349                         break;
 350                 case Opt_umask:
 351                         if (match_octal(args, &option))
 352                                 return 0;
 353                         *umask = option;
 354                         break;
 355                 case Opt_case_lower:
 356                         *lowercase = 1;
 357                         break;
 358                 case Opt_case_asis:
 359                         *lowercase = 0;
 360                         break;
 361                 case Opt_check_none:
 362                         *chk = 0;
 363                         break;
 364                 case Opt_check_normal:
 365                         *chk = 1;
 366                         break;
 367                 case Opt_check_strict:
 368                         *chk = 2;
 369                         break;
 370                 case Opt_err_cont:
 371                         *errs = 0;
 372                         break;
 373                 case Opt_err_ro:
 374                         *errs = 1;
 375                         break;
 376                 case Opt_err_panic:
 377                         *errs = 2;
 378                         break;
 379                 case Opt_eas_no:
 380                         *eas = 0;
 381                         break;
 382                 case Opt_eas_ro:
 383                         *eas = 1;
 384                         break;
 385                 case Opt_eas_rw:
 386                         *eas = 2;
 387                         break;
 388                 case Opt_chkdsk_no:
 389                         *chkdsk = 0;
 390                         break;
 391                 case Opt_chkdsk_errors:
 392                         *chkdsk = 1;
 393                         break;
 394                 case Opt_chkdsk_always:
 395                         *chkdsk = 2;
 396                         break;
 397                 case Opt_timeshift:
 398                 {
 399                         int m = 1;
 400                         char *rhs = args[0].from;
 401                         if (!rhs || !*rhs)
 402                                 return 0;
 403                         if (*rhs == '-') m = -1;
 404                         if (*rhs == '+' || *rhs == '-') rhs++;
 405                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 406                         if (*rhs)
 407                                 return 0;
 408                         break;
 409                 }
 410                 default:
 411                         return 0;
 412                 }
 413         }
 414         return 1;
 415 }
 416
 417 static inline void hpfs_help(void)
 418 {
 419         pr_info("\n\
 420 HPFS filesystem options:\n\
 421       help              do not mount and display this text\n\
 422       uid=xxx           set uid of files that don't have uid specified in eas\n\
 423       gid=xxx           set gid of files that don't have gid specified in eas\n\
 424       umask=xxx         set mode of files that don't have mode specified in eas\n\
 425       case=lower        lowercase all files\n\
 426       case=asis         do not lowercase files (default)\n\
 427       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 428       check=normal      do some checks - it should not crash (default)\n\
 429       check=strict      do extra time-consuming checks, used for debugging\n\
 430       errors=continue   continue on errors\n\
 431       errors=remount-ro remount read-only if errors found (default)\n\
 432       errors=panic      panic on errors\n\
 433       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 434       chkdsk=errors     mark fs dirty if errors found (default)\n\
 435       chkdsk=always     always mark fs dirty - used for debugging\n\
 436       eas=no            ignore extended attributes\n\
 437       eas=ro            read but do not write extended attributes\n\
 438       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 439       timeshift=nnn     add nnn seconds to file times\n\
 440 \n");
 441 }
 442
 443 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 444 {
 445         kuid_t uid;
 446         kgid_t gid;
 447         umode_t umask;
 448         int lowercase, eas, chk, errs, chkdsk, timeshift;
 449         int o;
 450         struct hpfs_sb_info *sbi = hpfs_sb(s);
 451
 452         sync_filesystem(s);
 453
 454         *flags |= SB_NOATIME;
 455
 456         hpfs_lock(s);
 457         uid = sbi->sb_uid; gid = sbi->sb_gid;
 458         umask = 0777 & ~sbi->sb_mode;
 459         lowercase = sbi->sb_lowercase;
 460         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 461         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 462
 463         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 464             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 465                 pr_err("bad mount options.\n");
 466                 goto out_err;
 467         }
 468         if (o == 2) {
 469                 hpfs_help();
 470                 goto out_err;
 471         }
 472         if (timeshift != sbi->sb_timeshift) {
 473                 pr_err("timeshift can't be changed using remount.\n");
 474                 goto out_err;
 475         }
 476
 477         unmark_dirty(s);
 478
 479         sbi->sb_uid = uid; sbi->sb_gid = gid;
 480         sbi->sb_mode = 0777 & ~umask;
 481         sbi->sb_lowercase = lowercase;
 482         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 483         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 484
 485         if (!(*flags & SB_RDONLY)) mark_dirty(s, 1);
 486
 487         hpfs_unlock(s);
 488         return 0;
 489
 490 out_err:
 491         hpfs_unlock(s);
 492         return -EINVAL;
 493 }
 494
 495 static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
 496 {
 497         struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
 498
 499         seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
 500         seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
 501         seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
 502         if (sbi->sb_lowercase)
 503                 seq_printf(seq, ",case=lower");
 504         if (!sbi->sb_chk)
 505                 seq_printf(seq, ",check=none");
 506         if (sbi->sb_chk == 2)
 507                 seq_printf(seq, ",check=strict");
 508         if (!sbi->sb_err)
 509                 seq_printf(seq, ",errors=continue");
 510         if (sbi->sb_err == 2)
 511                 seq_printf(seq, ",errors=panic");
 512         if (!sbi->sb_chkdsk)
 513                 seq_printf(seq, ",chkdsk=no");
 514         if (sbi->sb_chkdsk == 2)
 515                 seq_printf(seq, ",chkdsk=always");
 516         if (!sbi->sb_eas)
 517                 seq_printf(seq, ",eas=no");
 518         if (sbi->sb_eas == 1)
 519                 seq_printf(seq, ",eas=ro");
 520         if (sbi->sb_timeshift)
 521                 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
 522         return 0;
 523 }
 524
 525 /* Super operations */
 526
 527 static const struct super_operations hpfs_sops =
 528 {
 529         .alloc_inode    = hpfs_alloc_inode,
 530         .free_inode     = hpfs_free_inode,
 531         .evict_inode    = hpfs_evict_inode,
 532         .put_super      = hpfs_put_super,
 533         .statfs         = hpfs_statfs,
 534         .remount_fs     = hpfs_remount_fs,
 535         .show_options   = hpfs_show_options,
 536 };
 537
 538 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 539 {
 540         struct buffer_head *bh0, *bh1, *bh2;
 541         struct hpfs_boot_block *bootblock;
 542         struct hpfs_super_block *superblock;
 543         struct hpfs_spare_block *spareblock;
 544         struct hpfs_sb_info *sbi;
 545         struct inode *root;
 546
 547         kuid_t uid;
 548         kgid_t gid;
 549         umode_t umask;
 550         int lowercase, eas, chk, errs, chkdsk, timeshift;
 551
 552         dnode_secno root_dno;
 553         struct hpfs_dirent *de = NULL;
 554         struct quad_buffer_head qbh;
 555
 556         int o;
 557
 558         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 559         if (!sbi) {
 560                 return -ENOMEM;
 561         }
 562         s->s_fs_info = sbi;
 563
 564         mutex_init(&sbi->hpfs_mutex);
 565         hpfs_lock(s);
 566
 567         uid = current_uid();
 568         gid = current_gid();
 569         umask = current_umask();
 570         lowercase = 0;
 571         eas = 2;
 572         chk = 1;
 573         errs = 1;
 574         chkdsk = 1;
 575         timeshift = 0;
 576
 577         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
 578             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 579                 pr_err("bad mount options.\n");
 580                 goto bail0;
 581         }
 582         if (o==2) {
 583                 hpfs_help();
 584                 goto bail0;
 585         }
 586
 587         /*sbi->sb_mounting = 1;*/
 588         sb_set_blocksize(s, 512);
 589         sbi->sb_fs_size = -1;
 590         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 591         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 592         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 593
 594         /* Check magics */
 595         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 596             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 597             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
 598                 if (!silent)
 599                         pr_err("Bad magic ... probably not HPFS\n");
 600                 goto bail4;
 601         }
 602
 603         /* Check version */
 604         if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) {
 605                 pr_err("Bad version %d,%d. Mount readonly to go around\n",
 606                         (int)superblock->version, (int)superblock->funcversion);
 607                 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");
 608                 goto bail4;
 609         }
 610
 611         s->s_flags |= SB_NOATIME;
 612
 613         /* Fill superblock stuff */
 614         s->s_magic = HPFS_SUPER_MAGIC;
 615         s->s_op = &hpfs_sops;
 616         s->s_d_op = &hpfs_dentry_operations;
 617
 618         sbi->sb_root = le32_to_cpu(superblock->root);
 619         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 620         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 621         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 622         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 623         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 624         sbi->sb_uid = uid;
 625         sbi->sb_gid = gid;
 626         sbi->sb_mode = 0777 & ~umask;
 627         sbi->sb_n_free = -1;
 628         sbi->sb_n_free_dnodes = -1;
 629         sbi->sb_lowercase = lowercase;
 630         sbi->sb_eas = eas;
 631         sbi->sb_chk = chk;
 632         sbi->sb_chkdsk = chkdsk;
 633         sbi->sb_err = errs;
 634         sbi->sb_timeshift = timeshift;
 635         sbi->sb_was_error = 0;
 636         sbi->sb_cp_table = NULL;
 637         sbi->sb_c_bitmap = -1;
 638         sbi->sb_max_fwd_alloc = 0xffffff;
 639
 640         if (sbi->sb_fs_size >= 0x80000000) {
 641                 hpfs_error(s, "invalid size in superblock: %08x",
 642                         (unsigned)sbi->sb_fs_size);
 643                 goto bail4;
 644         }
 645
 646         if (spareblock->n_spares_used)
 647                 hpfs_load_hotfix_map(s, spareblock);
 648
 649         /* Load bitmap directory */
 650         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 651                 goto bail4;
 652
 653         /* Check for general fs errors*/
 654         if (spareblock->dirty && !spareblock->old_wrote) {
 655                 if (errs == 2) {
 656                         pr_err("Improperly stopped, not mounted\n");
 657                         goto bail4;
 658                 }
 659                 hpfs_error(s, "improperly stopped");
 660         }
 661
 662         if (!sb_rdonly(s)) {
 663                 spareblock->dirty = 1;
 664                 spareblock->old_wrote = 0;
 665                 mark_buffer_dirty(bh2);
 666         }
 667
 668         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 669                 if (errs >= 2) {
 670                         pr_err("Spare dnodes used, try chkdsk\n");
 671                         mark_dirty(s, 0);
 672                         goto bail4;
 673                 }
 674                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 675                 if (errs == 0)
 676                         pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 677         }
 678         if (chk) {
 679                 unsigned a;
 680                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 681                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 682                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 683                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 684                         goto bail4;
 685                 }
 686                 a = sbi->sb_dirband_size;
 687                 sbi->sb_dirband_size = 0;
 688                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 689                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 690                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 691                         mark_dirty(s, 0);
 692                         goto bail4;
 693                 }
 694                 sbi->sb_dirband_size = a;
 695         } else
 696                 pr_err("You really don't want any checks? You are crazy...\n");
 697
 698         /* Load code page table */
 699         if (le32_to_cpu(spareblock->n_code_pages))
 700                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 701                         pr_err("code page support is disabled\n");
 702
 703         brelse(bh2);
 704         brelse(bh1);
 705         brelse(bh0);
 706
 707         root = iget_locked(s, sbi->sb_root);
 708         if (!root)
 709                 goto bail0;
 710         hpfs_init_inode(root);
 711         hpfs_read_inode(root);
 712         unlock_new_inode(root);
 713         s->s_root = d_make_root(root);
 714         if (!s->s_root)
 715                 goto bail0;
 716
 717         /*
 718          * find the root directory's . pointer & finish filling in the inode
 719          */
 720
 721         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 722         if (root_dno)
 723                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 724         if (!de)
 725                 hpfs_error(s, "unable to find root dir");
 726         else {
 727                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 728                 root->i_atime.tv_nsec = 0;
 729                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 730                 root->i_mtime.tv_nsec = 0;
 731                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 732                 root->i_ctime.tv_nsec = 0;
 733                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
 734                 hpfs_i(root)->i_parent_dir = root->i_ino;
 735                 if (root->i_size == -1)
 736                         root->i_size = 2048;
 737                 if (root->i_blocks == -1)
 738                         root->i_blocks = 5;
 739                 hpfs_brelse4(&qbh);
 740         }
 741         hpfs_unlock(s);
 742         return 0;
 743
 744 bail4:  brelse(bh2);
 745 bail3:  brelse(bh1);
 746 bail2:  brelse(bh0);
 747 bail1:
 748 bail0:
 749         hpfs_unlock(s);
 750         free_sbi(sbi);
 751         return -EINVAL;
 752 }
 753
 754 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 755         int flags, const char *dev_name, void *data)
 756 {
 757         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 758 }
 759
 760 static struct file_system_type hpfs_fs_type = {
 761         .owner          = THIS_MODULE,
 762         .name           = "hpfs",
 763         .mount          = hpfs_mount,
 764         .kill_sb        = kill_block_super,
 765         .fs_flags       = FS_REQUIRES_DEV,
 766 };
 767 MODULE_ALIAS_FS("hpfs");
 768
 769 static int __init init_hpfs_fs(void)
 770 {
 771         int err = init_inodecache();
 772         if (err)
 773                 goto out1;
 774         err = register_filesystem(&hpfs_fs_type);
 775         if (err)
 776                 goto out;
 777         return 0;
 778 out:
 779         destroy_inodecache();
 780 out1:
 781         return err;
 782 }
 783
 784 static void __exit exit_hpfs_fs(void)
 785 {
 786         unregister_filesystem(&hpfs_fs_type);
 787         destroy_inodecache();
 788 }
 789
 790 module_init(init_hpfs_fs)
 791 module_exit(exit_hpfs_fs)
 792 MODULE_LICENSE("GPL");