fs/hpfs/super.c

   1 /*
   2  *  linux/fs/hpfs/super.c
   3  *
   4  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   5  *
   6  *  mounting, unmounting, error handling
   7  */
   8
   9 #include "hpfs_fn.h"
  10 #include <linux/module.h>
  11 #include <linux/parser.h>
  12 #include <linux/init.h>
  13 #include <linux/statfs.h>
  14 #include <linux/magic.h>
  15 #include <linux/sched.h>
  16 #include <linux/bitmap.h>
  17 #include <linux/slab.h>
  18
  19 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
  20
  21 static void mark_dirty(struct super_block *s, int remount)
  22 {
  23         if (hpfs_sb(s)->sb_chkdsk && (remount || !(s->s_flags & MS_RDONLY))) {
  24                 struct buffer_head *bh;
  25                 struct hpfs_spare_block *sb;
  26                 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  27                         sb->dirty = 1;
  28                         sb->old_wrote = 0;
  29                         mark_buffer_dirty(bh);
  30                         sync_dirty_buffer(bh);
  31                         brelse(bh);
  32                 }
  33         }
  34 }
  35
  36 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
  37    were errors) */
  38
  39 static void unmark_dirty(struct super_block *s)
  40 {
  41         struct buffer_head *bh;
  42         struct hpfs_spare_block *sb;
  43         if (s->s_flags & MS_RDONLY) return;
  44         sync_blockdev(s->s_bdev);
  45         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
  46                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
  47                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
  48                 mark_buffer_dirty(bh);
  49                 sync_dirty_buffer(bh);
  50                 brelse(bh);
  51         }
  52 }
  53
  54 /* Filesystem error... */
  55 static char err_buf[1024];
  56
  57 void hpfs_error(struct super_block *s, const char *fmt, ...)
  58 {
  59         va_list args;
  60
  61         va_start(args, fmt);
  62         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
  63         va_end(args);
  64
  65         pr_err("filesystem error: %s", err_buf);
  66         if (!hpfs_sb(s)->sb_was_error) {
  67                 if (hpfs_sb(s)->sb_err == 2) {
  68                         pr_cont("; crashing the system because you wanted it\n");
  69                         mark_dirty(s, 0);
  70                         panic("HPFS panic");
  71                 } else if (hpfs_sb(s)->sb_err == 1) {
  72                         if (s->s_flags & MS_RDONLY)
  73                                 pr_cont("; already mounted read-only\n");
  74                         else {
  75                                 pr_cont("; remounting read-only\n");
  76                                 mark_dirty(s, 0);
  77                                 s->s_flags |= MS_RDONLY;
  78                         }
  79                 } else if (s->s_flags & MS_RDONLY)
  80                                 pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
  81                 else
  82                         pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
  83         } else
  84                 pr_cont("\n");
  85         hpfs_sb(s)->sb_was_error = 1;
  86 }
  87
  88 /*
  89  * A little trick to detect cycles in many hpfs structures and don't let the
  90  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
  91  *
  92  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
  93  * nested each in other, chkdsk locked up happilly.
  94  */
  95
  96 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
  97                 char *msg)
  98 {
  99         if (*c2 && *c1 == key) {
 100                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
 101                 return 1;
 102         }
 103         (*c2)++;
 104         if (!((*c2 - 1) & *c2)) *c1 = key;
 105         return 0;
 106 }
 107
 108 static void free_sbi(struct hpfs_sb_info *sbi)
 109 {
 110         kfree(sbi->sb_cp_table);
 111         kfree(sbi->sb_bmp_dir);
 112         kfree(sbi);
 113 }
 114
 115 static void lazy_free_sbi(struct rcu_head *rcu)
 116 {
 117         free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
 118 }
 119
 120 static void hpfs_put_super(struct super_block *s)
 121 {
 122         hpfs_lock(s);
 123         unmark_dirty(s);
 124         hpfs_unlock(s);
 125         call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
 126 }
 127
 128 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
 129 {
 130         struct quad_buffer_head qbh;
 131         unsigned long *bits;
 132         unsigned count;
 133
 134         bits = hpfs_map_4sectors(s, secno, &qbh, 0);
 135         if (!bits)
 136                 return (unsigned)-1;
 137         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
 138         hpfs_brelse4(&qbh);
 139         return count;
 140 }
 141
 142 static unsigned count_bitmaps(struct super_block *s)
 143 {
 144         unsigned n, count, n_bands;
 145         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
 146         count = 0;
 147         for (n = 0; n < COUNT_RD_AHEAD; n++) {
 148                 hpfs_prefetch_bitmap(s, n);
 149         }
 150         for (n = 0; n < n_bands; n++) {
 151                 unsigned c;
 152                 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
 153                 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
 154                 if (c != (unsigned)-1)
 155                         count += c;
 156         }
 157         return count;
 158 }
 159
 160 unsigned hpfs_get_free_dnodes(struct super_block *s)
 161 {
 162         struct hpfs_sb_info *sbi = hpfs_sb(s);
 163         if (sbi->sb_n_free_dnodes == (unsigned)-1) {
 164                 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
 165                 if (c == (unsigned)-1)
 166                         return 0;
 167                 sbi->sb_n_free_dnodes = c;
 168         }
 169         return sbi->sb_n_free_dnodes;
 170 }
 171
 172 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 173 {
 174         struct super_block *s = dentry->d_sb;
 175         struct hpfs_sb_info *sbi = hpfs_sb(s);
 176         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
 177
 178         hpfs_lock(s);
 179
 180         if (sbi->sb_n_free == (unsigned)-1)
 181                 sbi->sb_n_free = count_bitmaps(s);
 182
 183         buf->f_type = s->s_magic;
 184         buf->f_bsize = 512;
 185         buf->f_blocks = sbi->sb_fs_size;
 186         buf->f_bfree = sbi->sb_n_free;
 187         buf->f_bavail = sbi->sb_n_free;
 188         buf->f_files = sbi->sb_dirband_size / 4;
 189         buf->f_ffree = hpfs_get_free_dnodes(s);
 190         buf->f_fsid.val[0] = (u32)id;
 191         buf->f_fsid.val[1] = (u32)(id >> 32);
 192         buf->f_namelen = 254;
 193
 194         hpfs_unlock(s);
 195
 196         return 0;
 197 }
 198
 199 static struct kmem_cache * hpfs_inode_cachep;
 200
 201 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 202 {
 203         struct hpfs_inode_info *ei;
 204         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 205         if (!ei)
 206                 return NULL;
 207         ei->vfs_inode.i_version = 1;
 208         return &ei->vfs_inode;
 209 }
 210
 211 static void hpfs_i_callback(struct rcu_head *head)
 212 {
 213         struct inode *inode = container_of(head, struct inode, i_rcu);
 214         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 215 }
 216
 217 static void hpfs_destroy_inode(struct inode *inode)
 218 {
 219         call_rcu(&inode->i_rcu, hpfs_i_callback);
 220 }
 221
 222 static void init_once(void *foo)
 223 {
 224         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 225
 226         inode_init_once(&ei->vfs_inode);
 227 }
 228
 229 static int init_inodecache(void)
 230 {
 231         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 232                                              sizeof(struct hpfs_inode_info),
 233                                              0, (SLAB_RECLAIM_ACCOUNT|
 234                                                 SLAB_MEM_SPREAD),
 235                                              init_once);
 236         if (hpfs_inode_cachep == NULL)
 237                 return -ENOMEM;
 238         return 0;
 239 }
 240
 241 static void destroy_inodecache(void)
 242 {
 243         /*
 244          * Make sure all delayed rcu free inodes are flushed before we
 245          * destroy cache.
 246          */
 247         rcu_barrier();
 248         kmem_cache_destroy(hpfs_inode_cachep);
 249 }
 250
 251 /*
 252  * A tiny parser for option strings, stolen from dosfs.
 253  * Stolen again from read-only hpfs.
 254  * And updated for table-driven option parsing.
 255  */
 256
 257 enum {
 258         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 259         Opt_check_none, Opt_check_normal, Opt_check_strict,
 260         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 261         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 262         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 263         Opt_timeshift, Opt_err,
 264 };
 265
 266 static const match_table_t tokens = {
 267         {Opt_help, "help"},
 268         {Opt_uid, "uid=%u"},
 269         {Opt_gid, "gid=%u"},
 270         {Opt_umask, "umask=%o"},
 271         {Opt_case_lower, "case=lower"},
 272         {Opt_case_asis, "case=asis"},
 273         {Opt_check_none, "check=none"},
 274         {Opt_check_normal, "check=normal"},
 275         {Opt_check_strict, "check=strict"},
 276         {Opt_err_cont, "errors=continue"},
 277         {Opt_err_ro, "errors=remount-ro"},
 278         {Opt_err_panic, "errors=panic"},
 279         {Opt_eas_no, "eas=no"},
 280         {Opt_eas_ro, "eas=ro"},
 281         {Opt_eas_rw, "eas=rw"},
 282         {Opt_chkdsk_no, "chkdsk=no"},
 283         {Opt_chkdsk_errors, "chkdsk=errors"},
 284         {Opt_chkdsk_always, "chkdsk=always"},
 285         {Opt_timeshift, "timeshift=%d"},
 286         {Opt_err, NULL},
 287 };
 288
 289 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
 290                       int *lowercase, int *eas, int *chk, int *errs,
 291                       int *chkdsk, int *timeshift)
 292 {
 293         char *p;
 294         int option;
 295
 296         if (!opts)
 297                 return 1;
 298
 299         /*pr_info("Parsing opts: '%s'\n",opts);*/
 300
 301         while ((p = strsep(&opts, ",")) != NULL) {
 302                 substring_t args[MAX_OPT_ARGS];
 303                 int token;
 304                 if (!*p)
 305                         continue;
 306
 307                 token = match_token(p, tokens, args);
 308                 switch (token) {
 309                 case Opt_help:
 310                         return 2;
 311                 case Opt_uid:
 312                         if (match_int(args, &option))
 313                                 return 0;
 314                         *uid = make_kuid(current_user_ns(), option);
 315                         if (!uid_valid(*uid))
 316                                 return 0;
 317                         break;
 318                 case Opt_gid:
 319                         if (match_int(args, &option))
 320                                 return 0;
 321                         *gid = make_kgid(current_user_ns(), option);
 322                         if (!gid_valid(*gid))
 323                                 return 0;
 324                         break;
 325                 case Opt_umask:
 326                         if (match_octal(args, &option))
 327                                 return 0;
 328                         *umask = option;
 329                         break;
 330                 case Opt_case_lower:
 331                         *lowercase = 1;
 332                         break;
 333                 case Opt_case_asis:
 334                         *lowercase = 0;
 335                         break;
 336                 case Opt_check_none:
 337                         *chk = 0;
 338                         break;
 339                 case Opt_check_normal:
 340                         *chk = 1;
 341                         break;
 342                 case Opt_check_strict:
 343                         *chk = 2;
 344                         break;
 345                 case Opt_err_cont:
 346                         *errs = 0;
 347                         break;
 348                 case Opt_err_ro:
 349                         *errs = 1;
 350                         break;
 351                 case Opt_err_panic:
 352                         *errs = 2;
 353                         break;
 354                 case Opt_eas_no:
 355                         *eas = 0;
 356                         break;
 357                 case Opt_eas_ro:
 358                         *eas = 1;
 359                         break;
 360                 case Opt_eas_rw:
 361                         *eas = 2;
 362                         break;
 363                 case Opt_chkdsk_no:
 364                         *chkdsk = 0;
 365                         break;
 366                 case Opt_chkdsk_errors:
 367                         *chkdsk = 1;
 368                         break;
 369                 case Opt_chkdsk_always:
 370                         *chkdsk = 2;
 371                         break;
 372                 case Opt_timeshift:
 373                 {
 374                         int m = 1;
 375                         char *rhs = args[0].from;
 376                         if (!rhs || !*rhs)
 377                                 return 0;
 378                         if (*rhs == '-') m = -1;
 379                         if (*rhs == '+' || *rhs == '-') rhs++;
 380                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 381                         if (*rhs)
 382                                 return 0;
 383                         break;
 384                 }
 385                 default:
 386                         return 0;
 387                 }
 388         }
 389         return 1;
 390 }
 391
 392 static inline void hpfs_help(void)
 393 {
 394         pr_info("\n\
 395 HPFS filesystem options:\n\
 396       help              do not mount and display this text\n\
 397       uid=xxx           set uid of files that don't have uid specified in eas\n\
 398       gid=xxx           set gid of files that don't have gid specified in eas\n\
 399       umask=xxx         set mode of files that don't have mode specified in eas\n\
 400       case=lower        lowercase all files\n\
 401       case=asis         do not lowercase files (default)\n\
 402       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 403       check=normal      do some checks - it should not crash (default)\n\
 404       check=strict      do extra time-consuming checks, used for debugging\n\
 405       errors=continue   continue on errors\n\
 406       errors=remount-ro remount read-only if errors found (default)\n\
 407       errors=panic      panic on errors\n\
 408       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 409       chkdsk=errors     mark fs dirty if errors found (default)\n\
 410       chkdsk=always     always mark fs dirty - used for debugging\n\
 411       eas=no            ignore extended attributes\n\
 412       eas=ro            read but do not write extended attributes\n\
 413       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 414       timeshift=nnn     add nnn seconds to file times\n\
 415 \n");
 416 }
 417
 418 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 419 {
 420         kuid_t uid;
 421         kgid_t gid;
 422         umode_t umask;
 423         int lowercase, eas, chk, errs, chkdsk, timeshift;
 424         int o;
 425         struct hpfs_sb_info *sbi = hpfs_sb(s);
 426         char *new_opts = kstrdup(data, GFP_KERNEL);
 427
 428         sync_filesystem(s);
 429
 430         *flags |= MS_NOATIME;
 431
 432         hpfs_lock(s);
 433         uid = sbi->sb_uid; gid = sbi->sb_gid;
 434         umask = 0777 & ~sbi->sb_mode;
 435         lowercase = sbi->sb_lowercase;
 436         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 437         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 438
 439         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 440             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 441                 pr_err("bad mount options.\n");
 442                 goto out_err;
 443         }
 444         if (o == 2) {
 445                 hpfs_help();
 446                 goto out_err;
 447         }
 448         if (timeshift != sbi->sb_timeshift) {
 449                 pr_err("timeshift can't be changed using remount.\n");
 450                 goto out_err;
 451         }
 452
 453         unmark_dirty(s);
 454
 455         sbi->sb_uid = uid; sbi->sb_gid = gid;
 456         sbi->sb_mode = 0777 & ~umask;
 457         sbi->sb_lowercase = lowercase;
 458         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 459         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 460
 461         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
 462
 463         replace_mount_options(s, new_opts);
 464
 465         hpfs_unlock(s);
 466         return 0;
 467
 468 out_err:
 469         hpfs_unlock(s);
 470         kfree(new_opts);
 471         return -EINVAL;
 472 }
 473
 474 /* Super operations */
 475
 476 static const struct super_operations hpfs_sops =
 477 {
 478         .alloc_inode    = hpfs_alloc_inode,
 479         .destroy_inode  = hpfs_destroy_inode,
 480         .evict_inode    = hpfs_evict_inode,
 481         .put_super      = hpfs_put_super,
 482         .statfs         = hpfs_statfs,
 483         .remount_fs     = hpfs_remount_fs,
 484         .show_options   = generic_show_options,
 485 };
 486
 487 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 488 {
 489         struct buffer_head *bh0, *bh1, *bh2;
 490         struct hpfs_boot_block *bootblock;
 491         struct hpfs_super_block *superblock;
 492         struct hpfs_spare_block *spareblock;
 493         struct hpfs_sb_info *sbi;
 494         struct inode *root;
 495
 496         kuid_t uid;
 497         kgid_t gid;
 498         umode_t umask;
 499         int lowercase, eas, chk, errs, chkdsk, timeshift;
 500
 501         dnode_secno root_dno;
 502         struct hpfs_dirent *de = NULL;
 503         struct quad_buffer_head qbh;
 504
 505         int o;
 506
 507         save_mount_options(s, options);
 508
 509         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 510         if (!sbi) {
 511                 return -ENOMEM;
 512         }
 513         s->s_fs_info = sbi;
 514
 515         mutex_init(&sbi->hpfs_mutex);
 516         hpfs_lock(s);
 517
 518         uid = current_uid();
 519         gid = current_gid();
 520         umask = current_umask();
 521         lowercase = 0;
 522         eas = 2;
 523         chk = 1;
 524         errs = 1;
 525         chkdsk = 1;
 526         timeshift = 0;
 527
 528         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
 529             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 530                 pr_err("bad mount options.\n");
 531                 goto bail0;
 532         }
 533         if (o==2) {
 534                 hpfs_help();
 535                 goto bail0;
 536         }
 537
 538         /*sbi->sb_mounting = 1;*/
 539         sb_set_blocksize(s, 512);
 540         sbi->sb_fs_size = -1;
 541         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 542         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 543         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 544
 545         /* Check magics */
 546         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 547             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 548             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
 549                 if (!silent)
 550                         pr_err("Bad magic ... probably not HPFS\n");
 551                 goto bail4;
 552         }
 553
 554         /* Check version */
 555         if (!(s->s_flags & MS_RDONLY) &&
 556               superblock->funcversion != 2 && superblock->funcversion != 3) {
 557                 pr_err("Bad version %d,%d. Mount readonly to go around\n",
 558                         (int)superblock->version, (int)superblock->funcversion);
 559                 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");
 560                 goto bail4;
 561         }
 562
 563         s->s_flags |= MS_NOATIME;
 564
 565         /* Fill superblock stuff */
 566         s->s_magic = HPFS_SUPER_MAGIC;
 567         s->s_op = &hpfs_sops;
 568         s->s_d_op = &hpfs_dentry_operations;
 569
 570         sbi->sb_root = le32_to_cpu(superblock->root);
 571         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 572         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 573         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 574         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 575         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 576         sbi->sb_uid = uid;
 577         sbi->sb_gid = gid;
 578         sbi->sb_mode = 0777 & ~umask;
 579         sbi->sb_n_free = -1;
 580         sbi->sb_n_free_dnodes = -1;
 581         sbi->sb_lowercase = lowercase;
 582         sbi->sb_eas = eas;
 583         sbi->sb_chk = chk;
 584         sbi->sb_chkdsk = chkdsk;
 585         sbi->sb_err = errs;
 586         sbi->sb_timeshift = timeshift;
 587         sbi->sb_was_error = 0;
 588         sbi->sb_cp_table = NULL;
 589         sbi->sb_c_bitmap = -1;
 590         sbi->sb_max_fwd_alloc = 0xffffff;
 591
 592         if (sbi->sb_fs_size >= 0x80000000) {
 593                 hpfs_error(s, "invalid size in superblock: %08x",
 594                         (unsigned)sbi->sb_fs_size);
 595                 goto bail4;
 596         }
 597
 598         /* Load bitmap directory */
 599         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 600                 goto bail4;
 601
 602         /* Check for general fs errors*/
 603         if (spareblock->dirty && !spareblock->old_wrote) {
 604                 if (errs == 2) {
 605                         pr_err("Improperly stopped, not mounted\n");
 606                         goto bail4;
 607                 }
 608                 hpfs_error(s, "improperly stopped");
 609         }
 610
 611         if (!(s->s_flags & MS_RDONLY)) {
 612                 spareblock->dirty = 1;
 613                 spareblock->old_wrote = 0;
 614                 mark_buffer_dirty(bh2);
 615         }
 616
 617         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 618                 if (errs >= 2) {
 619                         pr_err("Hotfixes not supported here, try chkdsk\n");
 620                         mark_dirty(s, 0);
 621                         goto bail4;
 622                 }
 623                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 624                 if (errs == 0)
 625                         pr_err("Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 626                 else
 627                         pr_err("This driver may read bad files or crash when operating on disk with hotfixes.\n");
 628         }
 629         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 630                 if (errs >= 2) {
 631                         pr_err("Spare dnodes used, try chkdsk\n");
 632                         mark_dirty(s, 0);
 633                         goto bail4;
 634                 }
 635                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 636                 if (errs == 0)
 637                         pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 638         }
 639         if (chk) {
 640                 unsigned a;
 641                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 642                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 643                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 644                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 645                         goto bail4;
 646                 }
 647                 a = sbi->sb_dirband_size;
 648                 sbi->sb_dirband_size = 0;
 649                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 650                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 651                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 652                         mark_dirty(s, 0);
 653                         goto bail4;
 654                 }
 655                 sbi->sb_dirband_size = a;
 656         } else
 657                 pr_err("You really don't want any checks? You are crazy...\n");
 658
 659         /* Load code page table */
 660         if (le32_to_cpu(spareblock->n_code_pages))
 661                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 662                         pr_err("code page support is disabled\n");
 663
 664         brelse(bh2);
 665         brelse(bh1);
 666         brelse(bh0);
 667
 668         root = iget_locked(s, sbi->sb_root);
 669         if (!root)
 670                 goto bail0;
 671         hpfs_init_inode(root);
 672         hpfs_read_inode(root);
 673         unlock_new_inode(root);
 674         s->s_root = d_make_root(root);
 675         if (!s->s_root)
 676                 goto bail0;
 677
 678         /*
 679          * find the root directory's . pointer & finish filling in the inode
 680          */
 681
 682         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 683         if (root_dno)
 684                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 685         if (!de)
 686                 hpfs_error(s, "unable to find root dir");
 687         else {
 688                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 689                 root->i_atime.tv_nsec = 0;
 690                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 691                 root->i_mtime.tv_nsec = 0;
 692                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 693                 root->i_ctime.tv_nsec = 0;
 694                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
 695                 hpfs_i(root)->i_parent_dir = root->i_ino;
 696                 if (root->i_size == -1)
 697                         root->i_size = 2048;
 698                 if (root->i_blocks == -1)
 699                         root->i_blocks = 5;
 700                 hpfs_brelse4(&qbh);
 701         }
 702         hpfs_unlock(s);
 703         return 0;
 704
 705 bail4:  brelse(bh2);
 706 bail3:  brelse(bh1);
 707 bail2:  brelse(bh0);
 708 bail1:
 709 bail0:
 710         hpfs_unlock(s);
 711         free_sbi(sbi);
 712         return -EINVAL;
 713 }
 714
 715 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 716         int flags, const char *dev_name, void *data)
 717 {
 718         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 719 }
 720
 721 static struct file_system_type hpfs_fs_type = {
 722         .owner          = THIS_MODULE,
 723         .name           = "hpfs",
 724         .mount          = hpfs_mount,
 725         .kill_sb        = kill_block_super,
 726         .fs_flags       = FS_REQUIRES_DEV,
 727 };
 728 MODULE_ALIAS_FS("hpfs");
 729
 730 static int __init init_hpfs_fs(void)
 731 {
 732         int err = init_inodecache();
 733         if (err)
 734                 goto out1;
 735         err = register_filesystem(&hpfs_fs_type);
 736         if (err)
 737                 goto out;
 738         return 0;
 739 out:
 740         destroy_inodecache();
 741 out1:
 742         return err;
 743 }
 744
 745 static void __exit exit_hpfs_fs(void)
 746 {
 747         unregister_filesystem(&hpfs_fs_type);
 748         destroy_inodecache();
 749 }
 750
 751 module_init(init_hpfs_fs)
 752 module_exit(exit_hpfs_fs)
 753 MODULE_LICENSE("GPL");