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 || !(s->s_flags & MS_RDONLY))) {
  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 (s->s_flags & MS_RDONLY) 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 (s->s_flags & MS_RDONLY)
  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 |= MS_RDONLY;
  82                         }
  83                 } else if (s->s_flags & MS_RDONLY)
  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         ei->vfs_inode.i_version = 1;
 239         return &ei->vfs_inode;
 240 }
 241
 242 static void hpfs_i_callback(struct rcu_head *head)
 243 {
 244         struct inode *inode = container_of(head, struct inode, i_rcu);
 245         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 246 }
 247
 248 static void hpfs_destroy_inode(struct inode *inode)
 249 {
 250         call_rcu(&inode->i_rcu, hpfs_i_callback);
 251 }
 252
 253 static void init_once(void *foo)
 254 {
 255         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 256
 257         inode_init_once(&ei->vfs_inode);
 258 }
 259
 260 static int init_inodecache(void)
 261 {
 262         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 263                                              sizeof(struct hpfs_inode_info),
 264                                              0, (SLAB_RECLAIM_ACCOUNT|
 265                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
 266                                              init_once);
 267         if (hpfs_inode_cachep == NULL)
 268                 return -ENOMEM;
 269         return 0;
 270 }
 271
 272 static void destroy_inodecache(void)
 273 {
 274         /*
 275          * Make sure all delayed rcu free inodes are flushed before we
 276          * destroy cache.
 277          */
 278         rcu_barrier();
 279         kmem_cache_destroy(hpfs_inode_cachep);
 280 }
 281
 282 /*
 283  * A tiny parser for option strings, stolen from dosfs.
 284  * Stolen again from read-only hpfs.
 285  * And updated for table-driven option parsing.
 286  */
 287
 288 enum {
 289         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 290         Opt_check_none, Opt_check_normal, Opt_check_strict,
 291         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 292         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 293         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 294         Opt_timeshift, Opt_err,
 295 };
 296
 297 static const match_table_t tokens = {
 298         {Opt_help, "help"},
 299         {Opt_uid, "uid=%u"},
 300         {Opt_gid, "gid=%u"},
 301         {Opt_umask, "umask=%o"},
 302         {Opt_case_lower, "case=lower"},
 303         {Opt_case_asis, "case=asis"},
 304         {Opt_check_none, "check=none"},
 305         {Opt_check_normal, "check=normal"},
 306         {Opt_check_strict, "check=strict"},
 307         {Opt_err_cont, "errors=continue"},
 308         {Opt_err_ro, "errors=remount-ro"},
 309         {Opt_err_panic, "errors=panic"},
 310         {Opt_eas_no, "eas=no"},
 311         {Opt_eas_ro, "eas=ro"},
 312         {Opt_eas_rw, "eas=rw"},
 313         {Opt_chkdsk_no, "chkdsk=no"},
 314         {Opt_chkdsk_errors, "chkdsk=errors"},
 315         {Opt_chkdsk_always, "chkdsk=always"},
 316         {Opt_timeshift, "timeshift=%d"},
 317         {Opt_err, NULL},
 318 };
 319
 320 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
 321                       int *lowercase, int *eas, int *chk, int *errs,
 322                       int *chkdsk, int *timeshift)
 323 {
 324         char *p;
 325         int option;
 326
 327         if (!opts)
 328                 return 1;
 329
 330         /*pr_info("Parsing opts: '%s'\n",opts);*/
 331
 332         while ((p = strsep(&opts, ",")) != NULL) {
 333                 substring_t args[MAX_OPT_ARGS];
 334                 int token;
 335                 if (!*p)
 336                         continue;
 337
 338                 token = match_token(p, tokens, args);
 339                 switch (token) {
 340                 case Opt_help:
 341                         return 2;
 342                 case Opt_uid:
 343                         if (match_int(args, &option))
 344                                 return 0;
 345                         *uid = make_kuid(current_user_ns(), option);
 346                         if (!uid_valid(*uid))
 347                                 return 0;
 348                         break;
 349                 case Opt_gid:
 350                         if (match_int(args, &option))
 351                                 return 0;
 352                         *gid = make_kgid(current_user_ns(), option);
 353                         if (!gid_valid(*gid))
 354                                 return 0;
 355                         break;
 356                 case Opt_umask:
 357                         if (match_octal(args, &option))
 358                                 return 0;
 359                         *umask = option;
 360                         break;
 361                 case Opt_case_lower:
 362                         *lowercase = 1;
 363                         break;
 364                 case Opt_case_asis:
 365                         *lowercase = 0;
 366                         break;
 367                 case Opt_check_none:
 368                         *chk = 0;
 369                         break;
 370                 case Opt_check_normal:
 371                         *chk = 1;
 372                         break;
 373                 case Opt_check_strict:
 374                         *chk = 2;
 375                         break;
 376                 case Opt_err_cont:
 377                         *errs = 0;
 378                         break;
 379                 case Opt_err_ro:
 380                         *errs = 1;
 381                         break;
 382                 case Opt_err_panic:
 383                         *errs = 2;
 384                         break;
 385                 case Opt_eas_no:
 386                         *eas = 0;
 387                         break;
 388                 case Opt_eas_ro:
 389                         *eas = 1;
 390                         break;
 391                 case Opt_eas_rw:
 392                         *eas = 2;
 393                         break;
 394                 case Opt_chkdsk_no:
 395                         *chkdsk = 0;
 396                         break;
 397                 case Opt_chkdsk_errors:
 398                         *chkdsk = 1;
 399                         break;
 400                 case Opt_chkdsk_always:
 401                         *chkdsk = 2;
 402                         break;
 403                 case Opt_timeshift:
 404                 {
 405                         int m = 1;
 406                         char *rhs = args[0].from;
 407                         if (!rhs || !*rhs)
 408                                 return 0;
 409                         if (*rhs == '-') m = -1;
 410                         if (*rhs == '+' || *rhs == '-') rhs++;
 411                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 412                         if (*rhs)
 413                                 return 0;
 414                         break;
 415                 }
 416                 default:
 417                         return 0;
 418                 }
 419         }
 420         return 1;
 421 }
 422
 423 static inline void hpfs_help(void)
 424 {
 425         pr_info("\n\
 426 HPFS filesystem options:\n\
 427       help              do not mount and display this text\n\
 428       uid=xxx           set uid of files that don't have uid specified in eas\n\
 429       gid=xxx           set gid of files that don't have gid specified in eas\n\
 430       umask=xxx         set mode of files that don't have mode specified in eas\n\
 431       case=lower        lowercase all files\n\
 432       case=asis         do not lowercase files (default)\n\
 433       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 434       check=normal      do some checks - it should not crash (default)\n\
 435       check=strict      do extra time-consuming checks, used for debugging\n\
 436       errors=continue   continue on errors\n\
 437       errors=remount-ro remount read-only if errors found (default)\n\
 438       errors=panic      panic on errors\n\
 439       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 440       chkdsk=errors     mark fs dirty if errors found (default)\n\
 441       chkdsk=always     always mark fs dirty - used for debugging\n\
 442       eas=no            ignore extended attributes\n\
 443       eas=ro            read but do not write extended attributes\n\
 444       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 445       timeshift=nnn     add nnn seconds to file times\n\
 446 \n");
 447 }
 448
 449 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 450 {
 451         kuid_t uid;
 452         kgid_t gid;
 453         umode_t umask;
 454         int lowercase, eas, chk, errs, chkdsk, timeshift;
 455         int o;
 456         struct hpfs_sb_info *sbi = hpfs_sb(s);
 457
 458         sync_filesystem(s);
 459
 460         *flags |= MS_NOATIME;
 461
 462         hpfs_lock(s);
 463         uid = sbi->sb_uid; gid = sbi->sb_gid;
 464         umask = 0777 & ~sbi->sb_mode;
 465         lowercase = sbi->sb_lowercase;
 466         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 467         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 468
 469         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 470             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 471                 pr_err("bad mount options.\n");
 472                 goto out_err;
 473         }
 474         if (o == 2) {
 475                 hpfs_help();
 476                 goto out_err;
 477         }
 478         if (timeshift != sbi->sb_timeshift) {
 479                 pr_err("timeshift can't be changed using remount.\n");
 480                 goto out_err;
 481         }
 482
 483         unmark_dirty(s);
 484
 485         sbi->sb_uid = uid; sbi->sb_gid = gid;
 486         sbi->sb_mode = 0777 & ~umask;
 487         sbi->sb_lowercase = lowercase;
 488         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 489         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 490
 491         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
 492
 493         hpfs_unlock(s);
 494         return 0;
 495
 496 out_err:
 497         hpfs_unlock(s);
 498         return -EINVAL;
 499 }
 500
 501 static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
 502 {
 503         struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
 504
 505         seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
 506         seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
 507         seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
 508         if (sbi->sb_lowercase)
 509                 seq_printf(seq, ",case=lower");
 510         if (!sbi->sb_chk)
 511                 seq_printf(seq, ",check=none");
 512         if (sbi->sb_chk == 2)
 513                 seq_printf(seq, ",check=strict");
 514         if (!sbi->sb_err)
 515                 seq_printf(seq, ",errors=continue");
 516         if (sbi->sb_err == 2)
 517                 seq_printf(seq, ",errors=panic");
 518         if (!sbi->sb_chkdsk)
 519                 seq_printf(seq, ",chkdsk=no");
 520         if (sbi->sb_chkdsk == 2)
 521                 seq_printf(seq, ",chkdsk=always");
 522         if (!sbi->sb_eas)
 523                 seq_printf(seq, ",eas=no");
 524         if (sbi->sb_eas == 1)
 525                 seq_printf(seq, ",eas=ro");
 526         if (sbi->sb_timeshift)
 527                 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
 528         return 0;
 529 }
 530
 531 /* Super operations */
 532
 533 static const struct super_operations hpfs_sops =
 534 {
 535         .alloc_inode    = hpfs_alloc_inode,
 536         .destroy_inode  = hpfs_destroy_inode,
 537         .evict_inode    = hpfs_evict_inode,
 538         .put_super      = hpfs_put_super,
 539         .statfs         = hpfs_statfs,
 540         .remount_fs     = hpfs_remount_fs,
 541         .show_options   = hpfs_show_options,
 542 };
 543
 544 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 545 {
 546         struct buffer_head *bh0, *bh1, *bh2;
 547         struct hpfs_boot_block *bootblock;
 548         struct hpfs_super_block *superblock;
 549         struct hpfs_spare_block *spareblock;
 550         struct hpfs_sb_info *sbi;
 551         struct inode *root;
 552
 553         kuid_t uid;
 554         kgid_t gid;
 555         umode_t umask;
 556         int lowercase, eas, chk, errs, chkdsk, timeshift;
 557
 558         dnode_secno root_dno;
 559         struct hpfs_dirent *de = NULL;
 560         struct quad_buffer_head qbh;
 561
 562         int o;
 563
 564         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 565         if (!sbi) {
 566                 return -ENOMEM;
 567         }
 568         s->s_fs_info = sbi;
 569
 570         mutex_init(&sbi->hpfs_mutex);
 571         hpfs_lock(s);
 572
 573         uid = current_uid();
 574         gid = current_gid();
 575         umask = current_umask();
 576         lowercase = 0;
 577         eas = 2;
 578         chk = 1;
 579         errs = 1;
 580         chkdsk = 1;
 581         timeshift = 0;
 582
 583         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
 584             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 585                 pr_err("bad mount options.\n");
 586                 goto bail0;
 587         }
 588         if (o==2) {
 589                 hpfs_help();
 590                 goto bail0;
 591         }
 592
 593         /*sbi->sb_mounting = 1;*/
 594         sb_set_blocksize(s, 512);
 595         sbi->sb_fs_size = -1;
 596         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 597         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 598         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 599
 600         /* Check magics */
 601         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 602             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 603             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
 604                 if (!silent)
 605                         pr_err("Bad magic ... probably not HPFS\n");
 606                 goto bail4;
 607         }
 608
 609         /* Check version */
 610         if (!(s->s_flags & MS_RDONLY) &&
 611               superblock->funcversion != 2 && superblock->funcversion != 3) {
 612                 pr_err("Bad version %d,%d. Mount readonly to go around\n",
 613                         (int)superblock->version, (int)superblock->funcversion);
 614                 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");
 615                 goto bail4;
 616         }
 617
 618         s->s_flags |= MS_NOATIME;
 619
 620         /* Fill superblock stuff */
 621         s->s_magic = HPFS_SUPER_MAGIC;
 622         s->s_op = &hpfs_sops;
 623         s->s_d_op = &hpfs_dentry_operations;
 624
 625         sbi->sb_root = le32_to_cpu(superblock->root);
 626         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 627         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 628         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 629         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 630         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 631         sbi->sb_uid = uid;
 632         sbi->sb_gid = gid;
 633         sbi->sb_mode = 0777 & ~umask;
 634         sbi->sb_n_free = -1;
 635         sbi->sb_n_free_dnodes = -1;
 636         sbi->sb_lowercase = lowercase;
 637         sbi->sb_eas = eas;
 638         sbi->sb_chk = chk;
 639         sbi->sb_chkdsk = chkdsk;
 640         sbi->sb_err = errs;
 641         sbi->sb_timeshift = timeshift;
 642         sbi->sb_was_error = 0;
 643         sbi->sb_cp_table = NULL;
 644         sbi->sb_c_bitmap = -1;
 645         sbi->sb_max_fwd_alloc = 0xffffff;
 646
 647         if (sbi->sb_fs_size >= 0x80000000) {
 648                 hpfs_error(s, "invalid size in superblock: %08x",
 649                         (unsigned)sbi->sb_fs_size);
 650                 goto bail4;
 651         }
 652
 653         if (spareblock->n_spares_used)
 654                 hpfs_load_hotfix_map(s, spareblock);
 655
 656         /* Load bitmap directory */
 657         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 658                 goto bail4;
 659
 660         /* Check for general fs errors*/
 661         if (spareblock->dirty && !spareblock->old_wrote) {
 662                 if (errs == 2) {
 663                         pr_err("Improperly stopped, not mounted\n");
 664                         goto bail4;
 665                 }
 666                 hpfs_error(s, "improperly stopped");
 667         }
 668
 669         if (!(s->s_flags & MS_RDONLY)) {
 670                 spareblock->dirty = 1;
 671                 spareblock->old_wrote = 0;
 672                 mark_buffer_dirty(bh2);
 673         }
 674
 675         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 676                 if (errs >= 2) {
 677                         pr_err("Spare dnodes used, try chkdsk\n");
 678                         mark_dirty(s, 0);
 679                         goto bail4;
 680                 }
 681                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 682                 if (errs == 0)
 683                         pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 684         }
 685         if (chk) {
 686                 unsigned a;
 687                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 688                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 689                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 690                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 691                         goto bail4;
 692                 }
 693                 a = sbi->sb_dirband_size;
 694                 sbi->sb_dirband_size = 0;
 695                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 696                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 697                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 698                         mark_dirty(s, 0);
 699                         goto bail4;
 700                 }
 701                 sbi->sb_dirband_size = a;
 702         } else
 703                 pr_err("You really don't want any checks? You are crazy...\n");
 704
 705         /* Load code page table */
 706         if (le32_to_cpu(spareblock->n_code_pages))
 707                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 708                         pr_err("code page support is disabled\n");
 709
 710         brelse(bh2);
 711         brelse(bh1);
 712         brelse(bh0);
 713
 714         root = iget_locked(s, sbi->sb_root);
 715         if (!root)
 716                 goto bail0;
 717         hpfs_init_inode(root);
 718         hpfs_read_inode(root);
 719         unlock_new_inode(root);
 720         s->s_root = d_make_root(root);
 721         if (!s->s_root)
 722                 goto bail0;
 723
 724         /*
 725          * find the root directory's . pointer & finish filling in the inode
 726          */
 727
 728         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 729         if (root_dno)
 730                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 731         if (!de)
 732                 hpfs_error(s, "unable to find root dir");
 733         else {
 734                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 735                 root->i_atime.tv_nsec = 0;
 736                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 737                 root->i_mtime.tv_nsec = 0;
 738                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 739                 root->i_ctime.tv_nsec = 0;
 740                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
 741                 hpfs_i(root)->i_parent_dir = root->i_ino;
 742                 if (root->i_size == -1)
 743                         root->i_size = 2048;
 744                 if (root->i_blocks == -1)
 745                         root->i_blocks = 5;
 746                 hpfs_brelse4(&qbh);
 747         }
 748         hpfs_unlock(s);
 749         return 0;
 750
 751 bail4:  brelse(bh2);
 752 bail3:  brelse(bh1);
 753 bail2:  brelse(bh0);
 754 bail1:
 755 bail0:
 756         hpfs_unlock(s);
 757         free_sbi(sbi);
 758         return -EINVAL;
 759 }
 760
 761 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 762         int flags, const char *dev_name, void *data)
 763 {
 764         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 765 }
 766
 767 static struct file_system_type hpfs_fs_type = {
 768         .owner          = THIS_MODULE,
 769         .name           = "hpfs",
 770         .mount          = hpfs_mount,
 771         .kill_sb        = kill_block_super,
 772         .fs_flags       = FS_REQUIRES_DEV,
 773 };
 774 MODULE_ALIAS_FS("hpfs");
 775
 776 static int __init init_hpfs_fs(void)
 777 {
 778         int err = init_inodecache();
 779         if (err)
 780                 goto out1;
 781         err = register_filesystem(&hpfs_fs_type);
 782         if (err)
 783                 goto out;
 784         return 0;
 785 out:
 786         destroy_inodecache();
 787 out1:
 788         return err;
 789 }
 790
 791 static void __exit exit_hpfs_fs(void)
 792 {
 793         unregister_filesystem(&hpfs_fs_type);
 794         destroy_inodecache();
 795 }
 796
 797 module_init(init_hpfs_fs)
 798 module_exit(exit_hpfs_fs)
 799 MODULE_LICENSE("GPL");