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