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 = u64_to_fsid(id);
 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 = alloc_inode_sb(sb, hpfs_inode_cachep, GFP_NOFS);
 236         if (!ei)
 237                 return NULL;
 238         return &ei->vfs_inode;
 239 }
 240
 241 static void hpfs_free_inode(struct inode *inode)
 242 {
 243         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 244 }
 245
 246 static void init_once(void *foo)
 247 {
 248         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 249
 250         inode_init_once(&ei->vfs_inode);
 251 }
 252
 253 static int init_inodecache(void)
 254 {
 255         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 256                                              sizeof(struct hpfs_inode_info),
 257                                              0, (SLAB_RECLAIM_ACCOUNT|
 258                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
 259                                              init_once);
 260         if (hpfs_inode_cachep == NULL)
 261                 return -ENOMEM;
 262         return 0;
 263 }
 264
 265 static void destroy_inodecache(void)
 266 {
 267         /*
 268          * Make sure all delayed rcu free inodes are flushed before we
 269          * destroy cache.
 270          */
 271         rcu_barrier();
 272         kmem_cache_destroy(hpfs_inode_cachep);
 273 }
 274
 275 /*
 276  * A tiny parser for option strings, stolen from dosfs.
 277  * Stolen again from read-only hpfs.
 278  * And updated for table-driven option parsing.
 279  */
 280
 281 enum {
 282         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 283         Opt_check_none, Opt_check_normal, Opt_check_strict,
 284         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 285         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 286         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 287         Opt_timeshift, Opt_err,
 288 };
 289
 290 static const match_table_t tokens = {
 291         {Opt_help, "help"},
 292         {Opt_uid, "uid=%u"},
 293         {Opt_gid, "gid=%u"},
 294         {Opt_umask, "umask=%o"},
 295         {Opt_case_lower, "case=lower"},
 296         {Opt_case_asis, "case=asis"},
 297         {Opt_check_none, "check=none"},
 298         {Opt_check_normal, "check=normal"},
 299         {Opt_check_strict, "check=strict"},
 300         {Opt_err_cont, "errors=continue"},
 301         {Opt_err_ro, "errors=remount-ro"},
 302         {Opt_err_panic, "errors=panic"},
 303         {Opt_eas_no, "eas=no"},
 304         {Opt_eas_ro, "eas=ro"},
 305         {Opt_eas_rw, "eas=rw"},
 306         {Opt_chkdsk_no, "chkdsk=no"},
 307         {Opt_chkdsk_errors, "chkdsk=errors"},
 308         {Opt_chkdsk_always, "chkdsk=always"},
 309         {Opt_timeshift, "timeshift=%d"},
 310         {Opt_err, NULL},
 311 };
 312
 313 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
 314                       int *lowercase, int *eas, int *chk, int *errs,
 315                       int *chkdsk, int *timeshift)
 316 {
 317         char *p;
 318         int option;
 319
 320         if (!opts)
 321                 return 1;
 322
 323         /*pr_info("Parsing opts: '%s'\n",opts);*/
 324
 325         while ((p = strsep(&opts, ",")) != NULL) {
 326                 substring_t args[MAX_OPT_ARGS];
 327                 int token;
 328                 if (!*p)
 329                         continue;
 330
 331                 token = match_token(p, tokens, args);
 332                 switch (token) {
 333                 case Opt_help:
 334                         return 2;
 335                 case Opt_uid:
 336                         if (match_int(args, &option))
 337                                 return 0;
 338                         *uid = make_kuid(current_user_ns(), option);
 339                         if (!uid_valid(*uid))
 340                                 return 0;
 341                         break;
 342                 case Opt_gid:
 343                         if (match_int(args, &option))
 344                                 return 0;
 345                         *gid = make_kgid(current_user_ns(), option);
 346                         if (!gid_valid(*gid))
 347                                 return 0;
 348                         break;
 349                 case Opt_umask:
 350                         if (match_octal(args, &option))
 351                                 return 0;
 352                         *umask = option;
 353                         break;
 354                 case Opt_case_lower:
 355                         *lowercase = 1;
 356                         break;
 357                 case Opt_case_asis:
 358                         *lowercase = 0;
 359                         break;
 360                 case Opt_check_none:
 361                         *chk = 0;
 362                         break;
 363                 case Opt_check_normal:
 364                         *chk = 1;
 365                         break;
 366                 case Opt_check_strict:
 367                         *chk = 2;
 368                         break;
 369                 case Opt_err_cont:
 370                         *errs = 0;
 371                         break;
 372                 case Opt_err_ro:
 373                         *errs = 1;
 374                         break;
 375                 case Opt_err_panic:
 376                         *errs = 2;
 377                         break;
 378                 case Opt_eas_no:
 379                         *eas = 0;
 380                         break;
 381                 case Opt_eas_ro:
 382                         *eas = 1;
 383                         break;
 384                 case Opt_eas_rw:
 385                         *eas = 2;
 386                         break;
 387                 case Opt_chkdsk_no:
 388                         *chkdsk = 0;
 389                         break;
 390                 case Opt_chkdsk_errors:
 391                         *chkdsk = 1;
 392                         break;
 393                 case Opt_chkdsk_always:
 394                         *chkdsk = 2;
 395                         break;
 396                 case Opt_timeshift:
 397                 {
 398                         int m = 1;
 399                         char *rhs = args[0].from;
 400                         if (!rhs || !*rhs)
 401                                 return 0;
 402                         if (*rhs == '-') m = -1;
 403                         if (*rhs == '+' || *rhs == '-') rhs++;
 404                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 405                         if (*rhs)
 406                                 return 0;
 407                         break;
 408                 }
 409                 default:
 410                         return 0;
 411                 }
 412         }
 413         return 1;
 414 }
 415
 416 static inline void hpfs_help(void)
 417 {
 418         pr_info("\n\
 419 HPFS filesystem options:\n\
 420       help              do not mount and display this text\n\
 421       uid=xxx           set uid of files that don't have uid specified in eas\n\
 422       gid=xxx           set gid of files that don't have gid specified in eas\n\
 423       umask=xxx         set mode of files that don't have mode specified in eas\n\
 424       case=lower        lowercase all files\n\
 425       case=asis         do not lowercase files (default)\n\
 426       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 427       check=normal      do some checks - it should not crash (default)\n\
 428       check=strict      do extra time-consuming checks, used for debugging\n\
 429       errors=continue   continue on errors\n\
 430       errors=remount-ro remount read-only if errors found (default)\n\
 431       errors=panic      panic on errors\n\
 432       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 433       chkdsk=errors     mark fs dirty if errors found (default)\n\
 434       chkdsk=always     always mark fs dirty - used for debugging\n\
 435       eas=no            ignore extended attributes\n\
 436       eas=ro            read but do not write extended attributes\n\
 437       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 438       timeshift=nnn     add nnn seconds to file times\n\
 439 \n");
 440 }
 441
 442 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 443 {
 444         kuid_t uid;
 445         kgid_t gid;
 446         umode_t umask;
 447         int lowercase, eas, chk, errs, chkdsk, timeshift;
 448         int o;
 449         struct hpfs_sb_info *sbi = hpfs_sb(s);
 450
 451         sync_filesystem(s);
 452
 453         *flags |= SB_NOATIME;
 454
 455         hpfs_lock(s);
 456         uid = sbi->sb_uid; gid = sbi->sb_gid;
 457         umask = 0777 & ~sbi->sb_mode;
 458         lowercase = sbi->sb_lowercase;
 459         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 460         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 461
 462         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 463             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 464                 pr_err("bad mount options.\n");
 465                 goto out_err;
 466         }
 467         if (o == 2) {
 468                 hpfs_help();
 469                 goto out_err;
 470         }
 471         if (timeshift != sbi->sb_timeshift) {
 472                 pr_err("timeshift can't be changed using remount.\n");
 473                 goto out_err;
 474         }
 475
 476         unmark_dirty(s);
 477
 478         sbi->sb_uid = uid; sbi->sb_gid = gid;
 479         sbi->sb_mode = 0777 & ~umask;
 480         sbi->sb_lowercase = lowercase;
 481         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 482         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 483
 484         if (!(*flags & SB_RDONLY)) mark_dirty(s, 1);
 485
 486         hpfs_unlock(s);
 487         return 0;
 488
 489 out_err:
 490         hpfs_unlock(s);
 491         return -EINVAL;
 492 }
 493
 494 static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
 495 {
 496         struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
 497
 498         seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
 499         seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
 500         seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
 501         if (sbi->sb_lowercase)
 502                 seq_printf(seq, ",case=lower");
 503         if (!sbi->sb_chk)
 504                 seq_printf(seq, ",check=none");
 505         if (sbi->sb_chk == 2)
 506                 seq_printf(seq, ",check=strict");
 507         if (!sbi->sb_err)
 508                 seq_printf(seq, ",errors=continue");
 509         if (sbi->sb_err == 2)
 510                 seq_printf(seq, ",errors=panic");
 511         if (!sbi->sb_chkdsk)
 512                 seq_printf(seq, ",chkdsk=no");
 513         if (sbi->sb_chkdsk == 2)
 514                 seq_printf(seq, ",chkdsk=always");
 515         if (!sbi->sb_eas)
 516                 seq_printf(seq, ",eas=no");
 517         if (sbi->sb_eas == 1)
 518                 seq_printf(seq, ",eas=ro");
 519         if (sbi->sb_timeshift)
 520                 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
 521         return 0;
 522 }
 523
 524 /* Super operations */
 525
 526 static const struct super_operations hpfs_sops =
 527 {
 528         .alloc_inode    = hpfs_alloc_inode,
 529         .free_inode     = hpfs_free_inode,
 530         .evict_inode    = hpfs_evict_inode,
 531         .put_super      = hpfs_put_super,
 532         .statfs         = hpfs_statfs,
 533         .remount_fs     = hpfs_remount_fs,
 534         .show_options   = hpfs_show_options,
 535 };
 536
 537 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 538 {
 539         struct buffer_head *bh0, *bh1, *bh2;
 540         struct hpfs_boot_block *bootblock;
 541         struct hpfs_super_block *superblock;
 542         struct hpfs_spare_block *spareblock;
 543         struct hpfs_sb_info *sbi;
 544         struct inode *root;
 545
 546         kuid_t uid;
 547         kgid_t gid;
 548         umode_t umask;
 549         int lowercase, eas, chk, errs, chkdsk, timeshift;
 550
 551         dnode_secno root_dno;
 552         struct hpfs_dirent *de = NULL;
 553         struct quad_buffer_head qbh;
 554
 555         int o;
 556
 557         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 558         if (!sbi) {
 559                 return -ENOMEM;
 560         }
 561         s->s_fs_info = sbi;
 562
 563         mutex_init(&sbi->hpfs_mutex);
 564         hpfs_lock(s);
 565
 566         uid = current_uid();
 567         gid = current_gid();
 568         umask = current_umask();
 569         lowercase = 0;
 570         eas = 2;
 571         chk = 1;
 572         errs = 1;
 573         chkdsk = 1;
 574         timeshift = 0;
 575
 576         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
 577             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 578                 pr_err("bad mount options.\n");
 579                 goto bail0;
 580         }
 581         if (o==2) {
 582                 hpfs_help();
 583                 goto bail0;
 584         }
 585
 586         /*sbi->sb_mounting = 1;*/
 587         sb_set_blocksize(s, 512);
 588         sbi->sb_fs_size = -1;
 589         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 590         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 591         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 592
 593         /* Check magics */
 594         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 595             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 596             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
 597                 if (!silent)
 598                         pr_err("Bad magic ... probably not HPFS\n");
 599                 goto bail4;
 600         }
 601
 602         /* Check version */
 603         if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) {
 604                 pr_err("Bad version %d,%d. Mount readonly to go around\n",
 605                         (int)superblock->version, (int)superblock->funcversion);
 606                 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");
 607                 goto bail4;
 608         }
 609
 610         s->s_flags |= SB_NOATIME;
 611
 612         /* Fill superblock stuff */
 613         s->s_magic = HPFS_SUPER_MAGIC;
 614         s->s_op = &hpfs_sops;
 615         s->s_d_op = &hpfs_dentry_operations;
 616         s->s_time_min =  local_to_gmt(s, 0);
 617         s->s_time_max =  local_to_gmt(s, U32_MAX);
 618
 619         sbi->sb_root = le32_to_cpu(superblock->root);
 620         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 621         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 622         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 623         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 624         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 625         sbi->sb_uid = uid;
 626         sbi->sb_gid = gid;
 627         sbi->sb_mode = 0777 & ~umask;
 628         sbi->sb_n_free = -1;
 629         sbi->sb_n_free_dnodes = -1;
 630         sbi->sb_lowercase = lowercase;
 631         sbi->sb_eas = eas;
 632         sbi->sb_chk = chk;
 633         sbi->sb_chkdsk = chkdsk;
 634         sbi->sb_err = errs;
 635         sbi->sb_timeshift = timeshift;
 636         sbi->sb_was_error = 0;
 637         sbi->sb_cp_table = NULL;
 638         sbi->sb_c_bitmap = -1;
 639         sbi->sb_max_fwd_alloc = 0xffffff;
 640
 641         if (sbi->sb_fs_size >= 0x80000000) {
 642                 hpfs_error(s, "invalid size in superblock: %08x",
 643                         (unsigned)sbi->sb_fs_size);
 644                 goto bail4;
 645         }
 646
 647         if (spareblock->n_spares_used)
 648                 hpfs_load_hotfix_map(s, spareblock);
 649
 650         /* Load bitmap directory */
 651         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 652                 goto bail4;
 653
 654         /* Check for general fs errors*/
 655         if (spareblock->dirty && !spareblock->old_wrote) {
 656                 if (errs == 2) {
 657                         pr_err("Improperly stopped, not mounted\n");
 658                         goto bail4;
 659                 }
 660                 hpfs_error(s, "improperly stopped");
 661         }
 662
 663         if (!sb_rdonly(s)) {
 664                 spareblock->dirty = 1;
 665                 spareblock->old_wrote = 0;
 666                 mark_buffer_dirty(bh2);
 667         }
 668
 669         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 670                 if (errs >= 2) {
 671                         pr_err("Spare dnodes used, try chkdsk\n");
 672                         mark_dirty(s, 0);
 673                         goto bail4;
 674                 }
 675                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 676                 if (errs == 0)
 677                         pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 678         }
 679         if (chk) {
 680                 unsigned a;
 681                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 682                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 683                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 684                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 685                         goto bail4;
 686                 }
 687                 a = sbi->sb_dirband_size;
 688                 sbi->sb_dirband_size = 0;
 689                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 690                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 691                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 692                         mark_dirty(s, 0);
 693                         goto bail4;
 694                 }
 695                 sbi->sb_dirband_size = a;
 696         } else
 697                 pr_err("You really don't want any checks? You are crazy...\n");
 698
 699         /* Load code page table */
 700         if (le32_to_cpu(spareblock->n_code_pages))
 701                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 702                         pr_err("code page support is disabled\n");
 703
 704         brelse(bh2);
 705         brelse(bh1);
 706         brelse(bh0);
 707
 708         root = iget_locked(s, sbi->sb_root);
 709         if (!root)
 710                 goto bail0;
 711         hpfs_init_inode(root);
 712         hpfs_read_inode(root);
 713         unlock_new_inode(root);
 714         s->s_root = d_make_root(root);
 715         if (!s->s_root)
 716                 goto bail0;
 717
 718         /*
 719          * find the root directory's . pointer & finish filling in the inode
 720          */
 721
 722         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 723         if (root_dno)
 724                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 725         if (!de)
 726                 hpfs_error(s, "unable to find root dir");
 727         else {
 728                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 729                 root->i_atime.tv_nsec = 0;
 730                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 731                 root->i_mtime.tv_nsec = 0;
 732                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 733                 root->i_ctime.tv_nsec = 0;
 734                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
 735                 hpfs_i(root)->i_parent_dir = root->i_ino;
 736                 if (root->i_size == -1)
 737                         root->i_size = 2048;
 738                 if (root->i_blocks == -1)
 739                         root->i_blocks = 5;
 740                 hpfs_brelse4(&qbh);
 741         }
 742         hpfs_unlock(s);
 743         return 0;
 744
 745 bail4:  brelse(bh2);
 746 bail3:  brelse(bh1);
 747 bail2:  brelse(bh0);
 748 bail1:
 749 bail0:
 750         hpfs_unlock(s);
 751         free_sbi(sbi);
 752         return -EINVAL;
 753 }
 754
 755 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 756         int flags, const char *dev_name, void *data)
 757 {
 758         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 759 }
 760
 761 static struct file_system_type hpfs_fs_type = {
 762         .owner          = THIS_MODULE,
 763         .name           = "hpfs",
 764         .mount          = hpfs_mount,
 765         .kill_sb        = kill_block_super,
 766         .fs_flags       = FS_REQUIRES_DEV,
 767 };
 768 MODULE_ALIAS_FS("hpfs");
 769
 770 static int __init init_hpfs_fs(void)
 771 {
 772         int err = init_inodecache();
 773         if (err)
 774                 goto out1;
 775         err = register_filesystem(&hpfs_fs_type);
 776         if (err)
 777                 goto out;
 778         return 0;
 779 out:
 780         destroy_inodecache();
 781 out1:
 782         return err;
 783 }
 784
 785 static void __exit exit_hpfs_fs(void)
 786 {
 787         unregister_filesystem(&hpfs_fs_type);
 788         destroy_inodecache();
 789 }
 790
 791 module_init(init_hpfs_fs)
 792 module_exit(exit_hpfs_fs)
 793 MODULE_LICENSE("GPL");