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 static struct kmem_cache * hpfs_inode_cachep;
 204
 205 static struct inode *hpfs_alloc_inode(struct super_block *sb)
 206 {
 207         struct hpfs_inode_info *ei;
 208         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
 209         if (!ei)
 210                 return NULL;
 211         ei->vfs_inode.i_version = 1;
 212         return &ei->vfs_inode;
 213 }
 214
 215 static void hpfs_i_callback(struct rcu_head *head)
 216 {
 217         struct inode *inode = container_of(head, struct inode, i_rcu);
 218         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
 219 }
 220
 221 static void hpfs_destroy_inode(struct inode *inode)
 222 {
 223         call_rcu(&inode->i_rcu, hpfs_i_callback);
 224 }
 225
 226 static void init_once(void *foo)
 227 {
 228         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
 229
 230         inode_init_once(&ei->vfs_inode);
 231 }
 232
 233 static int init_inodecache(void)
 234 {
 235         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
 236                                              sizeof(struct hpfs_inode_info),
 237                                              0, (SLAB_RECLAIM_ACCOUNT|
 238                                                 SLAB_MEM_SPREAD),
 239                                              init_once);
 240         if (hpfs_inode_cachep == NULL)
 241                 return -ENOMEM;
 242         return 0;
 243 }
 244
 245 static void destroy_inodecache(void)
 246 {
 247         /*
 248          * Make sure all delayed rcu free inodes are flushed before we
 249          * destroy cache.
 250          */
 251         rcu_barrier();
 252         kmem_cache_destroy(hpfs_inode_cachep);
 253 }
 254
 255 /*
 256  * A tiny parser for option strings, stolen from dosfs.
 257  * Stolen again from read-only hpfs.
 258  * And updated for table-driven option parsing.
 259  */
 260
 261 enum {
 262         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
 263         Opt_check_none, Opt_check_normal, Opt_check_strict,
 264         Opt_err_cont, Opt_err_ro, Opt_err_panic,
 265         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
 266         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
 267         Opt_timeshift, Opt_err,
 268 };
 269
 270 static const match_table_t tokens = {
 271         {Opt_help, "help"},
 272         {Opt_uid, "uid=%u"},
 273         {Opt_gid, "gid=%u"},
 274         {Opt_umask, "umask=%o"},
 275         {Opt_case_lower, "case=lower"},
 276         {Opt_case_asis, "case=asis"},
 277         {Opt_check_none, "check=none"},
 278         {Opt_check_normal, "check=normal"},
 279         {Opt_check_strict, "check=strict"},
 280         {Opt_err_cont, "errors=continue"},
 281         {Opt_err_ro, "errors=remount-ro"},
 282         {Opt_err_panic, "errors=panic"},
 283         {Opt_eas_no, "eas=no"},
 284         {Opt_eas_ro, "eas=ro"},
 285         {Opt_eas_rw, "eas=rw"},
 286         {Opt_chkdsk_no, "chkdsk=no"},
 287         {Opt_chkdsk_errors, "chkdsk=errors"},
 288         {Opt_chkdsk_always, "chkdsk=always"},
 289         {Opt_timeshift, "timeshift=%d"},
 290         {Opt_err, NULL},
 291 };
 292
 293 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
 294                       int *lowercase, int *eas, int *chk, int *errs,
 295                       int *chkdsk, int *timeshift)
 296 {
 297         char *p;
 298         int option;
 299
 300         if (!opts)
 301                 return 1;
 302
 303         /*pr_info("Parsing opts: '%s'\n",opts);*/
 304
 305         while ((p = strsep(&opts, ",")) != NULL) {
 306                 substring_t args[MAX_OPT_ARGS];
 307                 int token;
 308                 if (!*p)
 309                         continue;
 310
 311                 token = match_token(p, tokens, args);
 312                 switch (token) {
 313                 case Opt_help:
 314                         return 2;
 315                 case Opt_uid:
 316                         if (match_int(args, &option))
 317                                 return 0;
 318                         *uid = make_kuid(current_user_ns(), option);
 319                         if (!uid_valid(*uid))
 320                                 return 0;
 321                         break;
 322                 case Opt_gid:
 323                         if (match_int(args, &option))
 324                                 return 0;
 325                         *gid = make_kgid(current_user_ns(), option);
 326                         if (!gid_valid(*gid))
 327                                 return 0;
 328                         break;
 329                 case Opt_umask:
 330                         if (match_octal(args, &option))
 331                                 return 0;
 332                         *umask = option;
 333                         break;
 334                 case Opt_case_lower:
 335                         *lowercase = 1;
 336                         break;
 337                 case Opt_case_asis:
 338                         *lowercase = 0;
 339                         break;
 340                 case Opt_check_none:
 341                         *chk = 0;
 342                         break;
 343                 case Opt_check_normal:
 344                         *chk = 1;
 345                         break;
 346                 case Opt_check_strict:
 347                         *chk = 2;
 348                         break;
 349                 case Opt_err_cont:
 350                         *errs = 0;
 351                         break;
 352                 case Opt_err_ro:
 353                         *errs = 1;
 354                         break;
 355                 case Opt_err_panic:
 356                         *errs = 2;
 357                         break;
 358                 case Opt_eas_no:
 359                         *eas = 0;
 360                         break;
 361                 case Opt_eas_ro:
 362                         *eas = 1;
 363                         break;
 364                 case Opt_eas_rw:
 365                         *eas = 2;
 366                         break;
 367                 case Opt_chkdsk_no:
 368                         *chkdsk = 0;
 369                         break;
 370                 case Opt_chkdsk_errors:
 371                         *chkdsk = 1;
 372                         break;
 373                 case Opt_chkdsk_always:
 374                         *chkdsk = 2;
 375                         break;
 376                 case Opt_timeshift:
 377                 {
 378                         int m = 1;
 379                         char *rhs = args[0].from;
 380                         if (!rhs || !*rhs)
 381                                 return 0;
 382                         if (*rhs == '-') m = -1;
 383                         if (*rhs == '+' || *rhs == '-') rhs++;
 384                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
 385                         if (*rhs)
 386                                 return 0;
 387                         break;
 388                 }
 389                 default:
 390                         return 0;
 391                 }
 392         }
 393         return 1;
 394 }
 395
 396 static inline void hpfs_help(void)
 397 {
 398         pr_info("\n\
 399 HPFS filesystem options:\n\
 400       help              do not mount and display this text\n\
 401       uid=xxx           set uid of files that don't have uid specified in eas\n\
 402       gid=xxx           set gid of files that don't have gid specified in eas\n\
 403       umask=xxx         set mode of files that don't have mode specified in eas\n\
 404       case=lower        lowercase all files\n\
 405       case=asis         do not lowercase files (default)\n\
 406       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
 407       check=normal      do some checks - it should not crash (default)\n\
 408       check=strict      do extra time-consuming checks, used for debugging\n\
 409       errors=continue   continue on errors\n\
 410       errors=remount-ro remount read-only if errors found (default)\n\
 411       errors=panic      panic on errors\n\
 412       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
 413       chkdsk=errors     mark fs dirty if errors found (default)\n\
 414       chkdsk=always     always mark fs dirty - used for debugging\n\
 415       eas=no            ignore extended attributes\n\
 416       eas=ro            read but do not write extended attributes\n\
 417       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
 418       timeshift=nnn     add nnn seconds to file times\n\
 419 \n");
 420 }
 421
 422 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 423 {
 424         kuid_t uid;
 425         kgid_t gid;
 426         umode_t umask;
 427         int lowercase, eas, chk, errs, chkdsk, timeshift;
 428         int o;
 429         struct hpfs_sb_info *sbi = hpfs_sb(s);
 430
 431         sync_filesystem(s);
 432
 433         *flags |= MS_NOATIME;
 434
 435         hpfs_lock(s);
 436         uid = sbi->sb_uid; gid = sbi->sb_gid;
 437         umask = 0777 & ~sbi->sb_mode;
 438         lowercase = sbi->sb_lowercase;
 439         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
 440         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
 441
 442         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
 443             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 444                 pr_err("bad mount options.\n");
 445                 goto out_err;
 446         }
 447         if (o == 2) {
 448                 hpfs_help();
 449                 goto out_err;
 450         }
 451         if (timeshift != sbi->sb_timeshift) {
 452                 pr_err("timeshift can't be changed using remount.\n");
 453                 goto out_err;
 454         }
 455
 456         unmark_dirty(s);
 457
 458         sbi->sb_uid = uid; sbi->sb_gid = gid;
 459         sbi->sb_mode = 0777 & ~umask;
 460         sbi->sb_lowercase = lowercase;
 461         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
 462         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
 463
 464         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
 465
 466         hpfs_unlock(s);
 467         return 0;
 468
 469 out_err:
 470         hpfs_unlock(s);
 471         return -EINVAL;
 472 }
 473
 474 static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
 475 {
 476         struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
 477
 478         seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
 479         seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
 480         seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
 481         if (sbi->sb_lowercase)
 482                 seq_printf(seq, ",case=lower");
 483         if (!sbi->sb_chk)
 484                 seq_printf(seq, ",check=none");
 485         if (sbi->sb_chk == 2)
 486                 seq_printf(seq, ",check=strict");
 487         if (!sbi->sb_err)
 488                 seq_printf(seq, ",errors=continue");
 489         if (sbi->sb_err == 2)
 490                 seq_printf(seq, ",errors=panic");
 491         if (!sbi->sb_chkdsk)
 492                 seq_printf(seq, ",chkdsk=no");
 493         if (sbi->sb_chkdsk == 2)
 494                 seq_printf(seq, ",chkdsk=always");
 495         if (!sbi->sb_eas)
 496                 seq_printf(seq, ",eas=no");
 497         if (sbi->sb_eas == 1)
 498                 seq_printf(seq, ",eas=ro");
 499         if (sbi->sb_timeshift)
 500                 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
 501         return 0;
 502 }
 503
 504 /* Super operations */
 505
 506 static const struct super_operations hpfs_sops =
 507 {
 508         .alloc_inode    = hpfs_alloc_inode,
 509         .destroy_inode  = hpfs_destroy_inode,
 510         .evict_inode    = hpfs_evict_inode,
 511         .put_super      = hpfs_put_super,
 512         .statfs         = hpfs_statfs,
 513         .remount_fs     = hpfs_remount_fs,
 514         .show_options   = hpfs_show_options,
 515 };
 516
 517 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 518 {
 519         struct buffer_head *bh0, *bh1, *bh2;
 520         struct hpfs_boot_block *bootblock;
 521         struct hpfs_super_block *superblock;
 522         struct hpfs_spare_block *spareblock;
 523         struct hpfs_sb_info *sbi;
 524         struct inode *root;
 525
 526         kuid_t uid;
 527         kgid_t gid;
 528         umode_t umask;
 529         int lowercase, eas, chk, errs, chkdsk, timeshift;
 530
 531         dnode_secno root_dno;
 532         struct hpfs_dirent *de = NULL;
 533         struct quad_buffer_head qbh;
 534
 535         int o;
 536
 537         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 538         if (!sbi) {
 539                 return -ENOMEM;
 540         }
 541         s->s_fs_info = sbi;
 542
 543         mutex_init(&sbi->hpfs_mutex);
 544         hpfs_lock(s);
 545
 546         uid = current_uid();
 547         gid = current_gid();
 548         umask = current_umask();
 549         lowercase = 0;
 550         eas = 2;
 551         chk = 1;
 552         errs = 1;
 553         chkdsk = 1;
 554         timeshift = 0;
 555
 556         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
 557             &eas, &chk, &errs, &chkdsk, &timeshift))) {
 558                 pr_err("bad mount options.\n");
 559                 goto bail0;
 560         }
 561         if (o==2) {
 562                 hpfs_help();
 563                 goto bail0;
 564         }
 565
 566         /*sbi->sb_mounting = 1;*/
 567         sb_set_blocksize(s, 512);
 568         sbi->sb_fs_size = -1;
 569         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
 570         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
 571         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
 572
 573         /* Check magics */
 574         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
 575             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
 576             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
 577                 if (!silent)
 578                         pr_err("Bad magic ... probably not HPFS\n");
 579                 goto bail4;
 580         }
 581
 582         /* Check version */
 583         if (!(s->s_flags & MS_RDONLY) &&
 584               superblock->funcversion != 2 && superblock->funcversion != 3) {
 585                 pr_err("Bad version %d,%d. Mount readonly to go around\n",
 586                         (int)superblock->version, (int)superblock->funcversion);
 587                 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");
 588                 goto bail4;
 589         }
 590
 591         s->s_flags |= MS_NOATIME;
 592
 593         /* Fill superblock stuff */
 594         s->s_magic = HPFS_SUPER_MAGIC;
 595         s->s_op = &hpfs_sops;
 596         s->s_d_op = &hpfs_dentry_operations;
 597
 598         sbi->sb_root = le32_to_cpu(superblock->root);
 599         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
 600         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
 601         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
 602         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
 603         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
 604         sbi->sb_uid = uid;
 605         sbi->sb_gid = gid;
 606         sbi->sb_mode = 0777 & ~umask;
 607         sbi->sb_n_free = -1;
 608         sbi->sb_n_free_dnodes = -1;
 609         sbi->sb_lowercase = lowercase;
 610         sbi->sb_eas = eas;
 611         sbi->sb_chk = chk;
 612         sbi->sb_chkdsk = chkdsk;
 613         sbi->sb_err = errs;
 614         sbi->sb_timeshift = timeshift;
 615         sbi->sb_was_error = 0;
 616         sbi->sb_cp_table = NULL;
 617         sbi->sb_c_bitmap = -1;
 618         sbi->sb_max_fwd_alloc = 0xffffff;
 619
 620         if (sbi->sb_fs_size >= 0x80000000) {
 621                 hpfs_error(s, "invalid size in superblock: %08x",
 622                         (unsigned)sbi->sb_fs_size);
 623                 goto bail4;
 624         }
 625
 626         /* Load bitmap directory */
 627         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
 628                 goto bail4;
 629
 630         /* Check for general fs errors*/
 631         if (spareblock->dirty && !spareblock->old_wrote) {
 632                 if (errs == 2) {
 633                         pr_err("Improperly stopped, not mounted\n");
 634                         goto bail4;
 635                 }
 636                 hpfs_error(s, "improperly stopped");
 637         }
 638
 639         if (!(s->s_flags & MS_RDONLY)) {
 640                 spareblock->dirty = 1;
 641                 spareblock->old_wrote = 0;
 642                 mark_buffer_dirty(bh2);
 643         }
 644
 645         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
 646                 if (errs >= 2) {
 647                         pr_err("Hotfixes not supported here, try chkdsk\n");
 648                         mark_dirty(s, 0);
 649                         goto bail4;
 650                 }
 651                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
 652                 if (errs == 0)
 653                         pr_err("Proceeding, but your filesystem will be probably corrupted by this driver...\n");
 654                 else
 655                         pr_err("This driver may read bad files or crash when operating on disk with hotfixes.\n");
 656         }
 657         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
 658                 if (errs >= 2) {
 659                         pr_err("Spare dnodes used, try chkdsk\n");
 660                         mark_dirty(s, 0);
 661                         goto bail4;
 662                 }
 663                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
 664                 if (errs == 0)
 665                         pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
 666         }
 667         if (chk) {
 668                 unsigned a;
 669                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
 670                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
 671                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
 672                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
 673                         goto bail4;
 674                 }
 675                 a = sbi->sb_dirband_size;
 676                 sbi->sb_dirband_size = 0;
 677                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
 678                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
 679                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
 680                         mark_dirty(s, 0);
 681                         goto bail4;
 682                 }
 683                 sbi->sb_dirband_size = a;
 684         } else
 685                 pr_err("You really don't want any checks? You are crazy...\n");
 686
 687         /* Load code page table */
 688         if (le32_to_cpu(spareblock->n_code_pages))
 689                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
 690                         pr_err("code page support is disabled\n");
 691
 692         brelse(bh2);
 693         brelse(bh1);
 694         brelse(bh0);
 695
 696         root = iget_locked(s, sbi->sb_root);
 697         if (!root)
 698                 goto bail0;
 699         hpfs_init_inode(root);
 700         hpfs_read_inode(root);
 701         unlock_new_inode(root);
 702         s->s_root = d_make_root(root);
 703         if (!s->s_root)
 704                 goto bail0;
 705
 706         /*
 707          * find the root directory's . pointer & finish filling in the inode
 708          */
 709
 710         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
 711         if (root_dno)
 712                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
 713         if (!de)
 714                 hpfs_error(s, "unable to find root dir");
 715         else {
 716                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
 717                 root->i_atime.tv_nsec = 0;
 718                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
 719                 root->i_mtime.tv_nsec = 0;
 720                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
 721                 root->i_ctime.tv_nsec = 0;
 722                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
 723                 hpfs_i(root)->i_parent_dir = root->i_ino;
 724                 if (root->i_size == -1)
 725                         root->i_size = 2048;
 726                 if (root->i_blocks == -1)
 727                         root->i_blocks = 5;
 728                 hpfs_brelse4(&qbh);
 729         }
 730         hpfs_unlock(s);
 731         return 0;
 732
 733 bail4:  brelse(bh2);
 734 bail3:  brelse(bh1);
 735 bail2:  brelse(bh0);
 736 bail1:
 737 bail0:
 738         hpfs_unlock(s);
 739         free_sbi(sbi);
 740         return -EINVAL;
 741 }
 742
 743 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
 744         int flags, const char *dev_name, void *data)
 745 {
 746         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
 747 }
 748
 749 static struct file_system_type hpfs_fs_type = {
 750         .owner          = THIS_MODULE,
 751         .name           = "hpfs",
 752         .mount          = hpfs_mount,
 753         .kill_sb        = kill_block_super,
 754         .fs_flags       = FS_REQUIRES_DEV,
 755 };
 756 MODULE_ALIAS_FS("hpfs");
 757
 758 static int __init init_hpfs_fs(void)
 759 {
 760         int err = init_inodecache();
 761         if (err)
 762                 goto out1;
 763         err = register_filesystem(&hpfs_fs_type);
 764         if (err)
 765                 goto out;
 766         return 0;
 767 out:
 768         destroy_inodecache();
 769 out1:
 770         return err;
 771 }
 772
 773 static void __exit exit_hpfs_fs(void)
 774 {
 775         unregister_filesystem(&hpfs_fs_type);
 776         destroy_inodecache();
 777 }
 778
 779 module_init(init_hpfs_fs)
 780 module_exit(exit_hpfs_fs)
 781 MODULE_LICENSE("GPL");