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