fs/isofs/inode.c

   1 /*
   2  *  linux/fs/isofs/inode.c
   3  *
   4  *  (C) 1991  Linus Torvalds - minix filesystem
   5  *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
   6  *      1994  Eberhard Moenkeberg - multi session handling.
   7  *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
   8  *      1997  Gordon Chaffee - Joliet CDs
   9  *      1998  Eric Lammerts - ISO 9660 Level 3
  10  *      2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
  11  *      2004  Paul Serice - NFS Export Operations
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16
  17 #include <linux/slab.h>
  18 #include <linux/nls.h>
  19 #include <linux/ctype.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/statfs.h>
  22 #include <linux/cdrom.h>
  23 #include <linux/parser.h>
  24
  25 #include "isofs.h"
  26 #include "zisofs.h"
  27
  28 #define BEQUIET
  29
  30 static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
  31 static int isofs_hash(struct dentry *parent, struct qstr *qstr);
  32 static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
  33 static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
  34
  35 #ifdef CONFIG_JOLIET
  36 static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
  37 static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
  38 static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
  39 static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
  40 #endif
  41
  42 static void isofs_put_super(struct super_block *sb)
  43 {
  44         struct isofs_sb_info *sbi = ISOFS_SB(sb);
  45 #ifdef CONFIG_JOLIET
  46         if (sbi->s_nls_iocharset) {
  47                 unload_nls(sbi->s_nls_iocharset);
  48                 sbi->s_nls_iocharset = NULL;
  49         }
  50 #endif
  51
  52         kfree(sbi);
  53         sb->s_fs_info = NULL;
  54         return;
  55 }
  56
  57 static void isofs_read_inode(struct inode *);
  58 static int isofs_statfs (struct dentry *, struct kstatfs *);
  59
  60 static kmem_cache_t *isofs_inode_cachep;
  61
  62 static struct inode *isofs_alloc_inode(struct super_block *sb)
  63 {
  64         struct iso_inode_info *ei;
  65         ei = kmem_cache_alloc(isofs_inode_cachep, SLAB_KERNEL);
  66         if (!ei)
  67                 return NULL;
  68         return &ei->vfs_inode;
  69 }
  70
  71 static void isofs_destroy_inode(struct inode *inode)
  72 {
  73         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
  74 }
  75
  76 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
  77 {
  78         struct iso_inode_info *ei = foo;
  79
  80         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  81             SLAB_CTOR_CONSTRUCTOR)
  82                 inode_init_once(&ei->vfs_inode);
  83 }
  84
  85 static int init_inodecache(void)
  86 {
  87         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
  88                                              sizeof(struct iso_inode_info),
  89                                              0, (SLAB_RECLAIM_ACCOUNT|
  90                                                 SLAB_MEM_SPREAD),
  91                                              init_once, NULL);
  92         if (isofs_inode_cachep == NULL)
  93                 return -ENOMEM;
  94         return 0;
  95 }
  96
  97 static void destroy_inodecache(void)
  98 {
  99         if (kmem_cache_destroy(isofs_inode_cachep))
 100                 printk(KERN_INFO "iso_inode_cache: not all structures were "
 101                                         "freed\n");
 102 }
 103
 104 static int isofs_remount(struct super_block *sb, int *flags, char *data)
 105 {
 106         /* we probably want a lot more here */
 107         *flags |= MS_RDONLY;
 108         return 0;
 109 }
 110
 111 static struct super_operations isofs_sops = {
 112         .alloc_inode    = isofs_alloc_inode,
 113         .destroy_inode  = isofs_destroy_inode,
 114         .read_inode     = isofs_read_inode,
 115         .put_super      = isofs_put_super,
 116         .statfs         = isofs_statfs,
 117         .remount_fs     = isofs_remount,
 118 };
 119
 120
 121 static struct dentry_operations isofs_dentry_ops[] = {
 122         {
 123                 .d_hash         = isofs_hash,
 124                 .d_compare      = isofs_dentry_cmp,
 125         },
 126         {
 127                 .d_hash         = isofs_hashi,
 128                 .d_compare      = isofs_dentry_cmpi,
 129         },
 130 #ifdef CONFIG_JOLIET
 131         {
 132                 .d_hash         = isofs_hash_ms,
 133                 .d_compare      = isofs_dentry_cmp_ms,
 134         },
 135         {
 136                 .d_hash         = isofs_hashi_ms,
 137                 .d_compare      = isofs_dentry_cmpi_ms,
 138         },
 139 #endif
 140 };
 141
 142 struct iso9660_options{
 143         char map;
 144         char rock;
 145         char joliet;
 146         char cruft;
 147         char hide;
 148         char showassoc;
 149         char nocompress;
 150         unsigned char check;
 151         unsigned int blocksize;
 152         mode_t mode;
 153         gid_t gid;
 154         uid_t uid;
 155         char *iocharset;
 156         unsigned char utf8;
 157         /* LVE */
 158         s32 session;
 159         s32 sbsector;
 160 };
 161
 162 /*
 163  * Compute the hash for the isofs name corresponding to the dentry.
 164  */
 165 static int
 166 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
 167 {
 168         const char *name;
 169         int len;
 170
 171         len = qstr->len;
 172         name = qstr->name;
 173         if (ms) {
 174                 while (len && name[len-1] == '.')
 175                         len--;
 176         }
 177
 178         qstr->hash = full_name_hash(name, len);
 179
 180         return 0;
 181 }
 182
 183 /*
 184  * Compute the hash for the isofs name corresponding to the dentry.
 185  */
 186 static int
 187 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
 188 {
 189         const char *name;
 190         int len;
 191         char c;
 192         unsigned long hash;
 193
 194         len = qstr->len;
 195         name = qstr->name;
 196         if (ms) {
 197                 while (len && name[len-1] == '.')
 198                         len--;
 199         }
 200
 201         hash = init_name_hash();
 202         while (len--) {
 203                 c = tolower(*name++);
 204                 hash = partial_name_hash(tolower(c), hash);
 205         }
 206         qstr->hash = end_name_hash(hash);
 207
 208         return 0;
 209 }
 210
 211 /*
 212  * Case insensitive compare of two isofs names.
 213  */
 214 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
 215                                 struct qstr *b, int ms)
 216 {
 217         int alen, blen;
 218
 219         /* A filename cannot end in '.' or we treat it like it has none */
 220         alen = a->len;
 221         blen = b->len;
 222         if (ms) {
 223                 while (alen && a->name[alen-1] == '.')
 224                         alen--;
 225                 while (blen && b->name[blen-1] == '.')
 226                         blen--;
 227         }
 228         if (alen == blen) {
 229                 if (strnicmp(a->name, b->name, alen) == 0)
 230                         return 0;
 231         }
 232         return 1;
 233 }
 234
 235 /*
 236  * Case sensitive compare of two isofs names.
 237  */
 238 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
 239                                         struct qstr *b, int ms)
 240 {
 241         int alen, blen;
 242
 243         /* A filename cannot end in '.' or we treat it like it has none */
 244         alen = a->len;
 245         blen = b->len;
 246         if (ms) {
 247                 while (alen && a->name[alen-1] == '.')
 248                         alen--;
 249                 while (blen && b->name[blen-1] == '.')
 250                         blen--;
 251         }
 252         if (alen == blen) {
 253                 if (strncmp(a->name, b->name, alen) == 0)
 254                         return 0;
 255         }
 256         return 1;
 257 }
 258
 259 static int
 260 isofs_hash(struct dentry *dentry, struct qstr *qstr)
 261 {
 262         return isofs_hash_common(dentry, qstr, 0);
 263 }
 264
 265 static int
 266 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
 267 {
 268         return isofs_hashi_common(dentry, qstr, 0);
 269 }
 270
 271 static int
 272 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
 273 {
 274         return isofs_dentry_cmp_common(dentry, a, b, 0);
 275 }
 276
 277 static int
 278 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
 279 {
 280         return isofs_dentry_cmpi_common(dentry, a, b, 0);
 281 }
 282
 283 #ifdef CONFIG_JOLIET
 284 static int
 285 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
 286 {
 287         return isofs_hash_common(dentry, qstr, 1);
 288 }
 289
 290 static int
 291 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
 292 {
 293         return isofs_hashi_common(dentry, qstr, 1);
 294 }
 295
 296 static int
 297 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
 298 {
 299         return isofs_dentry_cmp_common(dentry, a, b, 1);
 300 }
 301
 302 static int
 303 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
 304 {
 305         return isofs_dentry_cmpi_common(dentry, a, b, 1);
 306 }
 307 #endif
 308
 309 enum {
 310         Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
 311         Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
 312         Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
 313         Opt_nocompress, Opt_hide, Opt_showassoc,
 314 };
 315
 316 static match_table_t tokens = {
 317         {Opt_norock, "norock"},
 318         {Opt_nojoliet, "nojoliet"},
 319         {Opt_unhide, "unhide"},
 320         {Opt_hide, "hide"},
 321         {Opt_showassoc, "showassoc"},
 322         {Opt_cruft, "cruft"},
 323         {Opt_utf8, "utf8"},
 324         {Opt_iocharset, "iocharset=%s"},
 325         {Opt_map_a, "map=acorn"},
 326         {Opt_map_a, "map=a"},
 327         {Opt_map_n, "map=normal"},
 328         {Opt_map_n, "map=n"},
 329         {Opt_map_o, "map=off"},
 330         {Opt_map_o, "map=o"},
 331         {Opt_session, "session=%u"},
 332         {Opt_sb, "sbsector=%u"},
 333         {Opt_check_r, "check=relaxed"},
 334         {Opt_check_r, "check=r"},
 335         {Opt_check_s, "check=strict"},
 336         {Opt_check_s, "check=s"},
 337         {Opt_uid, "uid=%u"},
 338         {Opt_gid, "gid=%u"},
 339         {Opt_mode, "mode=%u"},
 340         {Opt_block, "block=%u"},
 341         {Opt_ignore, "conv=binary"},
 342         {Opt_ignore, "conv=b"},
 343         {Opt_ignore, "conv=text"},
 344         {Opt_ignore, "conv=t"},
 345         {Opt_ignore, "conv=mtext"},
 346         {Opt_ignore, "conv=m"},
 347         {Opt_ignore, "conv=auto"},
 348         {Opt_ignore, "conv=a"},
 349         {Opt_nocompress, "nocompress"},
 350         {Opt_err, NULL}
 351 };
 352
 353 static int parse_options(char *options, struct iso9660_options *popt)
 354 {
 355         char *p;
 356         int option;
 357
 358         popt->map = 'n';
 359         popt->rock = 'y';
 360         popt->joliet = 'y';
 361         popt->cruft = 'n';
 362         popt->hide = 'n';
 363         popt->showassoc = 'n';
 364         popt->check = 'u';              /* unset */
 365         popt->nocompress = 0;
 366         popt->blocksize = 1024;
 367         popt->mode = S_IRUGO | S_IXUGO; /* r-x for all.  The disc could
 368                                            be shared with DOS machines so
 369                                            virtually anything could be
 370                                            a valid executable. */
 371         popt->gid = 0;
 372         popt->uid = 0;
 373         popt->iocharset = NULL;
 374         popt->utf8 = 0;
 375         popt->session=-1;
 376         popt->sbsector=-1;
 377         if (!options)
 378                 return 1;
 379
 380         while ((p = strsep(&options, ",")) != NULL) {
 381                 int token;
 382                 substring_t args[MAX_OPT_ARGS];
 383                 unsigned n;
 384
 385                 if (!*p)
 386                         continue;
 387
 388                 token = match_token(p, tokens, args);
 389                 switch (token) {
 390                 case Opt_norock:
 391                         popt->rock = 'n';
 392                         break;
 393                 case Opt_nojoliet:
 394                         popt->joliet = 'n';
 395                         break;
 396                 case Opt_hide:
 397                         popt->hide = 'y';
 398                         break;
 399                 case Opt_unhide:
 400                 case Opt_showassoc:
 401                         popt->showassoc = 'y';
 402                         break;
 403                 case Opt_cruft:
 404                         popt->cruft = 'y';
 405                         break;
 406                 case Opt_utf8:
 407                         popt->utf8 = 1;
 408                         break;
 409 #ifdef CONFIG_JOLIET
 410                 case Opt_iocharset:
 411                         popt->iocharset = match_strdup(&args[0]);
 412                         break;
 413 #endif
 414                 case Opt_map_a:
 415                         popt->map = 'a';
 416                         break;
 417                 case Opt_map_o:
 418                         popt->map = 'o';
 419                         break;
 420                 case Opt_map_n:
 421                         popt->map = 'n';
 422                         break;
 423                 case Opt_session:
 424                         if (match_int(&args[0], &option))
 425                                 return 0;
 426                         n = option;
 427                         if (n > 99)
 428                                 return 0;
 429                         popt->session = n + 1;
 430                         break;
 431                 case Opt_sb:
 432                         if (match_int(&args[0], &option))
 433                                 return 0;
 434                         popt->sbsector = option;
 435                         break;
 436                 case Opt_check_r:
 437                         popt->check = 'r';
 438                         break;
 439                 case Opt_check_s:
 440                         popt->check = 's';
 441                         break;
 442                 case Opt_ignore:
 443                         break;
 444                 case Opt_uid:
 445                         if (match_int(&args[0], &option))
 446                                 return 0;
 447                         popt->uid = option;
 448                         break;
 449                 case Opt_gid:
 450                         if (match_int(&args[0], &option))
 451                                 return 0;
 452                         popt->gid = option;
 453                         break;
 454                 case Opt_mode:
 455                         if (match_int(&args[0], &option))
 456                                 return 0;
 457                         popt->mode = option;
 458                         break;
 459                 case Opt_block:
 460                         if (match_int(&args[0], &option))
 461                                 return 0;
 462                         n = option;
 463                         if (n != 512 && n != 1024 && n != 2048)
 464                                 return 0;
 465                         popt->blocksize = n;
 466                         break;
 467                 case Opt_nocompress:
 468                         popt->nocompress = 1;
 469                         break;
 470                 default:
 471                         return 0;
 472                 }
 473         }
 474         return 1;
 475 }
 476
 477 /*
 478  * look if the driver can tell the multi session redirection value
 479  *
 480  * don't change this if you don't know what you do, please!
 481  * Multisession is legal only with XA disks.
 482  * A non-XA disk with more than one volume descriptor may do it right, but
 483  * usually is written in a nowhere standardized "multi-partition" manner.
 484  * Multisession uses absolute addressing (solely the first frame of the whole
 485  * track is #0), multi-partition uses relative addressing (each first frame of
 486  * each track is #0), and a track is not a session.
 487  *
 488  * A broken CDwriter software or drive firmware does not set new standards,
 489  * at least not if conflicting with the existing ones.
 490  *
 491  * emoenke@gwdg.de
 492  */
 493 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
 494
 495 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
 496 {
 497         struct cdrom_multisession ms_info;
 498         unsigned int vol_desc_start;
 499         struct block_device *bdev = sb->s_bdev;
 500         int i;
 501
 502         vol_desc_start=0;
 503         ms_info.addr_format=CDROM_LBA;
 504         if(session >= 0 && session <= 99) {
 505                 struct cdrom_tocentry Te;
 506                 Te.cdte_track=session;
 507                 Te.cdte_format=CDROM_LBA;
 508                 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
 509                 if (!i) {
 510                         printk(KERN_DEBUG "Session %d start %d type %d\n",
 511                                session, Te.cdte_addr.lba,
 512                                Te.cdte_ctrl&CDROM_DATA_TRACK);
 513                         if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
 514                                 return Te.cdte_addr.lba;
 515                 }
 516
 517                 printk(KERN_ERR "Invalid session number or type of track\n");
 518         }
 519         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
 520         if (session > 0)
 521                 printk(KERN_ERR "Invalid session number\n");
 522 #if 0
 523         printk("isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
 524         if (i==0) {
 525                 printk("isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
 526                 printk("isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
 527         }
 528 #endif
 529         if (i==0)
 530 #if WE_OBEY_THE_WRITTEN_STANDARDS
 531         if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
 532 #endif
 533                 vol_desc_start=ms_info.addr.lba;
 534         return vol_desc_start;
 535 }
 536
 537 /*
 538  * Initialize the superblock and read the root inode.
 539  *
 540  * Note: a check_disk_change() has been done immediately prior
 541  * to this call, so we don't need to check again.
 542  */
 543 static int isofs_fill_super(struct super_block *s, void *data, int silent)
 544 {
 545         struct buffer_head            * bh = NULL, *pri_bh = NULL;
 546         struct hs_primary_descriptor  * h_pri = NULL;
 547         struct iso_primary_descriptor * pri = NULL;
 548         struct iso_supplementary_descriptor *sec = NULL;
 549         struct iso_directory_record   * rootp;
 550         int                             joliet_level = 0;
 551         int                             iso_blknum, block;
 552         int                             orig_zonesize;
 553         int                             table;
 554         unsigned int                    vol_desc_start;
 555         unsigned long                   first_data_zone;
 556         struct inode                  * inode;
 557         struct iso9660_options          opt;
 558         struct isofs_sb_info          * sbi;
 559
 560         sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
 561         if (!sbi)
 562                 return -ENOMEM;
 563         s->s_fs_info = sbi;
 564         memset(sbi, 0, sizeof(*sbi));
 565
 566         if (!parse_options((char *)data, &opt))
 567                 goto out_freesbi;
 568
 569         /*
 570          * First of all, get the hardware blocksize for this device.
 571          * If we don't know what it is, or the hardware blocksize is
 572          * larger than the blocksize the user specified, then use
 573          * that value.
 574          */
 575         /*
 576          * What if bugger tells us to go beyond page size?
 577          */
 578         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
 579
 580         sbi->s_high_sierra = 0; /* default is iso9660 */
 581
 582         vol_desc_start = (opt.sbsector != -1) ?
 583                 opt.sbsector : isofs_get_last_session(s,opt.session);
 584
 585         for (iso_blknum = vol_desc_start+16;
 586              iso_blknum < vol_desc_start+100; iso_blknum++)
 587         {
 588             struct hs_volume_descriptor   * hdp;
 589             struct iso_volume_descriptor  * vdp;
 590
 591             block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
 592             if (!(bh = sb_bread(s, block)))
 593                 goto out_no_read;
 594
 595             vdp = (struct iso_volume_descriptor *)bh->b_data;
 596             hdp = (struct hs_volume_descriptor *)bh->b_data;
 597
 598             /* Due to the overlapping physical location of the descriptors,
 599              * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
 600              * proper identification in this case, we first check for ISO.
 601              */
 602             if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
 603                 if (isonum_711 (vdp->type) == ISO_VD_END)
 604                     break;
 605                 if (isonum_711 (vdp->type) == ISO_VD_PRIMARY) {
 606                     if (pri == NULL) {
 607                         pri = (struct iso_primary_descriptor *)vdp;
 608                         /* Save the buffer in case we need it ... */
 609                         pri_bh = bh;
 610                         bh = NULL;
 611                     }
 612                 }
 613 #ifdef CONFIG_JOLIET
 614                 else if (isonum_711 (vdp->type) == ISO_VD_SUPPLEMENTARY) {
 615                     sec = (struct iso_supplementary_descriptor *)vdp;
 616                     if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
 617                         if (opt.joliet == 'y') {
 618                             if (sec->escape[2] == 0x40) {
 619                                 joliet_level = 1;
 620                             } else if (sec->escape[2] == 0x43) {
 621                                 joliet_level = 2;
 622                             } else if (sec->escape[2] == 0x45) {
 623                                 joliet_level = 3;
 624                             }
 625                             printk(KERN_DEBUG"ISO 9660 Extensions: Microsoft Joliet Level %d\n",
 626                                    joliet_level);
 627                         }
 628                         goto root_found;
 629                     } else {
 630                         /* Unknown supplementary volume descriptor */
 631                         sec = NULL;
 632                     }
 633                 }
 634 #endif
 635             } else {
 636                 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
 637                     if (isonum_711 (hdp->type) != ISO_VD_PRIMARY)
 638                         goto out_freebh;
 639
 640                     sbi->s_high_sierra = 1;
 641                     opt.rock = 'n';
 642                     h_pri = (struct hs_primary_descriptor *)vdp;
 643                     goto root_found;
 644                 }
 645             }
 646
 647             /* Just skip any volume descriptors we don't recognize */
 648
 649             brelse(bh);
 650             bh = NULL;
 651         }
 652         /*
 653          * If we fall through, either no volume descriptor was found,
 654          * or else we passed a primary descriptor looking for others.
 655          */
 656         if (!pri)
 657                 goto out_unknown_format;
 658         brelse(bh);
 659         bh = pri_bh;
 660         pri_bh = NULL;
 661
 662 root_found:
 663
 664         if (joliet_level && (pri == NULL || opt.rock == 'n')) {
 665             /* This is the case of Joliet with the norock mount flag.
 666              * A disc with both Joliet and Rock Ridge is handled later
 667              */
 668             pri = (struct iso_primary_descriptor *) sec;
 669         }
 670
 671         if(sbi->s_high_sierra){
 672           rootp = (struct iso_directory_record *) h_pri->root_directory_record;
 673           sbi->s_nzones = isonum_733 (h_pri->volume_space_size);
 674           sbi->s_log_zone_size = isonum_723 (h_pri->logical_block_size);
 675           sbi->s_max_size = isonum_733(h_pri->volume_space_size);
 676         } else {
 677           if (!pri)
 678             goto out_freebh;
 679           rootp = (struct iso_directory_record *) pri->root_directory_record;
 680           sbi->s_nzones = isonum_733 (pri->volume_space_size);
 681           sbi->s_log_zone_size = isonum_723 (pri->logical_block_size);
 682           sbi->s_max_size = isonum_733(pri->volume_space_size);
 683         }
 684
 685         sbi->s_ninodes = 0; /* No way to figure this out easily */
 686
 687         orig_zonesize = sbi->s_log_zone_size;
 688         /*
 689          * If the zone size is smaller than the hardware sector size,
 690          * this is a fatal error.  This would occur if the disc drive
 691          * had sectors that were 2048 bytes, but the filesystem had
 692          * blocks that were 512 bytes (which should only very rarely
 693          * happen.)
 694          */
 695         if(orig_zonesize < opt.blocksize)
 696                 goto out_bad_size;
 697
 698         /* RDE: convert log zone size to bit shift */
 699         switch (sbi->s_log_zone_size)
 700           { case  512: sbi->s_log_zone_size =  9; break;
 701             case 1024: sbi->s_log_zone_size = 10; break;
 702             case 2048: sbi->s_log_zone_size = 11; break;
 703
 704             default:
 705                 goto out_bad_zone_size;
 706           }
 707
 708         s->s_magic = ISOFS_SUPER_MAGIC;
 709         s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
 710
 711         /* The CDROM is read-only, has no nodes (devices) on it, and since
 712            all of the files appear to be owned by root, we really do not want
 713            to allow suid.  (suid or devices will not show up unless we have
 714            Rock Ridge extensions) */
 715
 716         s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
 717
 718         /* Set this for reference. Its not currently used except on write
 719            which we don't have .. */
 720
 721         first_data_zone = isonum_733 (rootp->extent) +
 722                           isonum_711 (rootp->ext_attr_length);
 723         sbi->s_firstdatazone = first_data_zone;
 724 #ifndef BEQUIET
 725         printk(KERN_DEBUG "Max size:%ld   Log zone size:%ld\n",
 726                sbi->s_max_size,
 727                1UL << sbi->s_log_zone_size);
 728         printk(KERN_DEBUG "First datazone:%ld\n", sbi->s_firstdatazone);
 729         if(sbi->s_high_sierra)
 730                 printk(KERN_DEBUG "Disc in High Sierra format.\n");
 731 #endif
 732
 733         /*
 734          * If the Joliet level is set, we _may_ decide to use the
 735          * secondary descriptor, but can't be sure until after we
 736          * read the root inode. But before reading the root inode
 737          * we may need to change the device blocksize, and would
 738          * rather release the old buffer first. So, we cache the
 739          * first_data_zone value from the secondary descriptor.
 740          */
 741         if (joliet_level) {
 742                 pri = (struct iso_primary_descriptor *) sec;
 743                 rootp = (struct iso_directory_record *)
 744                         pri->root_directory_record;
 745                 first_data_zone = isonum_733 (rootp->extent) +
 746                                 isonum_711 (rootp->ext_attr_length);
 747         }
 748
 749         /*
 750          * We're all done using the volume descriptor, and may need
 751          * to change the device blocksize, so release the buffer now.
 752          */
 753         brelse(pri_bh);
 754         brelse(bh);
 755
 756         /*
 757          * Force the blocksize to 512 for 512 byte sectors.  The file
 758          * read primitives really get it wrong in a bad way if we don't
 759          * do this.
 760          *
 761          * Note - we should never be setting the blocksize to something
 762          * less than the hardware sector size for the device.  If we
 763          * do, we would end up having to read larger buffers and split
 764          * out portions to satisfy requests.
 765          *
 766          * Note2- the idea here is that we want to deal with the optimal
 767          * zonesize in the filesystem.  If we have it set to something less,
 768          * then we have horrible problems with trying to piece together
 769          * bits of adjacent blocks in order to properly read directory
 770          * entries.  By forcing the blocksize in this way, we ensure
 771          * that we will never be required to do this.
 772          */
 773         sb_set_blocksize(s, orig_zonesize);
 774
 775         sbi->s_nls_iocharset = NULL;
 776
 777 #ifdef CONFIG_JOLIET
 778         if (joliet_level && opt.utf8 == 0) {
 779                 char * p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
 780                 sbi->s_nls_iocharset = load_nls(p);
 781                 if (! sbi->s_nls_iocharset) {
 782                         /* Fail only if explicit charset specified */
 783                         if (opt.iocharset)
 784                                 goto out_freesbi;
 785                         sbi->s_nls_iocharset = load_nls_default();
 786                 }
 787         }
 788 #endif
 789         s->s_op = &isofs_sops;
 790         s->s_export_op = &isofs_export_ops;
 791         sbi->s_mapping = opt.map;
 792         sbi->s_rock = (opt.rock == 'y' ? 2 : 0);
 793         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
 794         sbi->s_cruft = opt.cruft;
 795         sbi->s_hide = opt.hide;
 796         sbi->s_showassoc = opt.showassoc;
 797         sbi->s_uid = opt.uid;
 798         sbi->s_gid = opt.gid;
 799         sbi->s_utf8 = opt.utf8;
 800         sbi->s_nocompress = opt.nocompress;
 801         /*
 802          * It would be incredibly stupid to allow people to mark every file
 803          * on the disk as suid, so we merely allow them to set the default
 804          * permissions.
 805          */
 806         sbi->s_mode = opt.mode & 0777;
 807
 808         /*
 809          * Read the root inode, which _may_ result in changing
 810          * the s_rock flag. Once we have the final s_rock value,
 811          * we then decide whether to use the Joliet descriptor.
 812          */
 813         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 814
 815         /*
 816          * If this disk has both Rock Ridge and Joliet on it, then we
 817          * want to use Rock Ridge by default.  This can be overridden
 818          * by using the norock mount option.  There is still one other
 819          * possibility that is not taken into account: a Rock Ridge
 820          * CD with Unicode names.  Until someone sees such a beast, it
 821          * will not be supported.
 822          */
 823         if (sbi->s_rock == 1) {
 824                 joliet_level = 0;
 825         } else if (joliet_level) {
 826                 sbi->s_rock = 0;
 827                 if (sbi->s_firstdatazone != first_data_zone) {
 828                         sbi->s_firstdatazone = first_data_zone;
 829                         printk(KERN_DEBUG
 830                                 "ISOFS: changing to secondary root\n");
 831                         iput(inode);
 832                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 833                 }
 834         }
 835
 836         if (opt.check == 'u') {
 837                 /* Only Joliet is case insensitive by default */
 838                 if (joliet_level) opt.check = 'r';
 839                 else opt.check = 's';
 840         }
 841         sbi->s_joliet_level = joliet_level;
 842
 843         /* check the root inode */
 844         if (!inode)
 845                 goto out_no_root;
 846         if (!inode->i_op)
 847                 goto out_bad_root;
 848         /* get the root dentry */
 849         s->s_root = d_alloc_root(inode);
 850         if (!(s->s_root))
 851                 goto out_no_root;
 852
 853         table = 0;
 854         if (joliet_level) table += 2;
 855         if (opt.check == 'r') table++;
 856         s->s_root->d_op = &isofs_dentry_ops[table];
 857
 858         kfree(opt.iocharset);
 859
 860         return 0;
 861
 862         /*
 863          * Display error messages and free resources.
 864          */
 865 out_bad_root:
 866         printk(KERN_WARNING "isofs_fill_super: root inode not initialized\n");
 867         goto out_iput;
 868 out_no_root:
 869         printk(KERN_WARNING "isofs_fill_super: get root inode failed\n");
 870 out_iput:
 871         iput(inode);
 872 #ifdef CONFIG_JOLIET
 873         if (sbi->s_nls_iocharset)
 874                 unload_nls(sbi->s_nls_iocharset);
 875 #endif
 876         goto out_freesbi;
 877 out_no_read:
 878         printk(KERN_WARNING "isofs_fill_super: "
 879                 "bread failed, dev=%s, iso_blknum=%d, block=%d\n",
 880                 s->s_id, iso_blknum, block);
 881         goto out_freesbi;
 882 out_bad_zone_size:
 883         printk(KERN_WARNING "Bad logical zone size %ld\n",
 884                 sbi->s_log_zone_size);
 885         goto out_freebh;
 886 out_bad_size:
 887         printk(KERN_WARNING "Logical zone size(%d) < hardware blocksize(%u)\n",
 888                 orig_zonesize, opt.blocksize);
 889         goto out_freebh;
 890 out_unknown_format:
 891         if (!silent)
 892                 printk(KERN_WARNING "Unable to identify CD-ROM format.\n");
 893
 894 out_freebh:
 895         brelse(bh);
 896 out_freesbi:
 897         kfree(opt.iocharset);
 898         kfree(sbi);
 899         s->s_fs_info = NULL;
 900         return -EINVAL;
 901 }
 902
 903 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
 904 {
 905         struct super_block *sb = dentry->d_sb;
 906
 907         buf->f_type = ISOFS_SUPER_MAGIC;
 908         buf->f_bsize = sb->s_blocksize;
 909         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
 910                   << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
 911         buf->f_bfree = 0;
 912         buf->f_bavail = 0;
 913         buf->f_files = ISOFS_SB(sb)->s_ninodes;
 914         buf->f_ffree = 0;
 915         buf->f_namelen = NAME_MAX;
 916         return 0;
 917 }
 918
 919 /*
 920  * Get a set of blocks; filling in buffer_heads if already allocated
 921  * or getblk() if they are not.  Returns the number of blocks inserted
 922  * (0 == error.)
 923  */
 924 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
 925                      struct buffer_head **bh, unsigned long nblocks)
 926 {
 927         unsigned long b_off;
 928         unsigned offset, sect_size;
 929         unsigned int firstext;
 930         unsigned long nextblk, nextoff;
 931         long iblock = (long)iblock_s;
 932         int section, rv;
 933         struct iso_inode_info *ei = ISOFS_I(inode);
 934
 935         lock_kernel();
 936
 937         rv = 0;
 938         if (iblock < 0 || iblock != iblock_s) {
 939                 printk("isofs_get_blocks: block number too large\n");
 940                 goto abort;
 941         }
 942
 943         b_off = iblock;
 944
 945         offset    = 0;
 946         firstext  = ei->i_first_extent;
 947         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
 948         nextblk   = ei->i_next_section_block;
 949         nextoff   = ei->i_next_section_offset;
 950         section   = 0;
 951
 952         while ( nblocks ) {
 953                 /* If we are *way* beyond the end of the file, print a message.
 954                  * Access beyond the end of the file up to the next page boundary
 955                  * is normal, however because of the way the page cache works.
 956                  * In this case, we just return 0 so that we can properly fill
 957                  * the page with useless information without generating any
 958                  * I/O errors.
 959                  */
 960                 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
 961                         printk("isofs_get_blocks: block >= EOF (%ld, %ld)\n",
 962                                iblock, (unsigned long) inode->i_size);
 963                         goto abort;
 964                 }
 965
 966                 if (nextblk) {
 967                         while (b_off >= (offset + sect_size)) {
 968                                 struct inode *ninode;
 969
 970                                 offset += sect_size;
 971                                 if (nextblk == 0)
 972                                         goto abort;
 973                                 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
 974                                 if (!ninode)
 975                                         goto abort;
 976                                 firstext  = ISOFS_I(ninode)->i_first_extent;
 977                                 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
 978                                 nextblk   = ISOFS_I(ninode)->i_next_section_block;
 979                                 nextoff   = ISOFS_I(ninode)->i_next_section_offset;
 980                                 iput(ninode);
 981
 982                                 if (++section > 100) {
 983                                         printk("isofs_get_blocks: More than 100 file sections ?!?, aborting...\n");
 984                                         printk("isofs_get_blocks: block=%ld firstext=%u sect_size=%u "
 985                                                "nextblk=%lu nextoff=%lu\n",
 986                                                iblock, firstext, (unsigned) sect_size,
 987                                                nextblk, nextoff);
 988                                         goto abort;
 989                                 }
 990                         }
 991                 }
 992
 993                 if ( *bh ) {
 994                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
 995                 } else {
 996                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
 997                         if ( !*bh )
 998                                 goto abort;
 999                 }
1000                 bh++;   /* Next buffer head */
1001                 b_off++;        /* Next buffer offset */
1002                 nblocks--;
1003                 rv++;
1004         }
1005
1006 abort:
1007         unlock_kernel();
1008         return rv;
1009 }
1010
1011 /*
1012  * Used by the standard interfaces.
1013  */
1014 static int isofs_get_block(struct inode *inode, sector_t iblock,
1015                     struct buffer_head *bh_result, int create)
1016 {
1017         if (create) {
1018                 printk("isofs_get_block: Kernel tries to allocate a block\n");
1019                 return -EROFS;
1020         }
1021
1022         return isofs_get_blocks(inode, iblock, &bh_result, 1) ? 0 : -EIO;
1023 }
1024
1025 static int isofs_bmap(struct inode *inode, sector_t block)
1026 {
1027         struct buffer_head dummy;
1028         int error;
1029
1030         dummy.b_state = 0;
1031         dummy.b_blocknr = -1000;
1032         error = isofs_get_block(inode, block, &dummy, 0);
1033         if (!error)
1034                 return dummy.b_blocknr;
1035         return 0;
1036 }
1037
1038 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1039 {
1040         sector_t blknr = isofs_bmap(inode, block);
1041         if (!blknr)
1042                 return NULL;
1043         return sb_bread(inode->i_sb, blknr);
1044 }
1045
1046 static int isofs_readpage(struct file *file, struct page *page)
1047 {
1048         return block_read_full_page(page,isofs_get_block);
1049 }
1050
1051 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1052 {
1053         return generic_block_bmap(mapping,block,isofs_get_block);
1054 }
1055
1056 static const struct address_space_operations isofs_aops = {
1057         .readpage = isofs_readpage,
1058         .sync_page = block_sync_page,
1059         .bmap = _isofs_bmap
1060 };
1061
1062 static inline void test_and_set_uid(uid_t *p, uid_t value)
1063 {
1064         if (value)
1065                 *p = value;
1066 }
1067
1068 static inline void test_and_set_gid(gid_t *p, gid_t value)
1069 {
1070         if (value)
1071                 *p = value;
1072 }
1073
1074 static int isofs_read_level3_size(struct inode *inode)
1075 {
1076         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1077         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1078         struct buffer_head * bh = NULL;
1079         unsigned long block, offset, block_saved, offset_saved;
1080         int i = 0;
1081         int more_entries = 0;
1082         struct iso_directory_record * tmpde = NULL;
1083         struct iso_inode_info *ei = ISOFS_I(inode);
1084
1085         inode->i_size = 0;
1086
1087         /* The first 16 blocks are reserved as the System Area.  Thus,
1088          * no inodes can appear in block 0.  We use this to flag that
1089          * this is the last section. */
1090         ei->i_next_section_block = 0;
1091         ei->i_next_section_offset = 0;
1092
1093         block = ei->i_iget5_block;
1094         offset = ei->i_iget5_offset;
1095
1096         do {
1097                 struct iso_directory_record * de;
1098                 unsigned int de_len;
1099
1100                 if (!bh) {
1101                         bh = sb_bread(inode->i_sb, block);
1102                         if (!bh)
1103                                 goto out_noread;
1104                 }
1105                 de = (struct iso_directory_record *) (bh->b_data + offset);
1106                 de_len = *(unsigned char *) de;
1107
1108                 if (de_len == 0) {
1109                         brelse(bh);
1110                         bh = NULL;
1111                         ++block;
1112                         offset = 0;
1113                         continue;
1114                 }
1115
1116                 block_saved = block;
1117                 offset_saved = offset;
1118                 offset += de_len;
1119
1120                 /* Make sure we have a full directory entry */
1121                 if (offset >= bufsize) {
1122                         int slop = bufsize - offset + de_len;
1123                         if (!tmpde) {
1124                                 tmpde = kmalloc(256, GFP_KERNEL);
1125                                 if (!tmpde)
1126                                         goto out_nomem;
1127                         }
1128                         memcpy(tmpde, de, slop);
1129                         offset &= bufsize - 1;
1130                         block++;
1131                         brelse(bh);
1132                         bh = NULL;
1133                         if (offset) {
1134                                 bh = sb_bread(inode->i_sb, block);
1135                                 if (!bh)
1136                                         goto out_noread;
1137                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1138                         }
1139                         de = tmpde;
1140                 }
1141
1142                 inode->i_size += isonum_733(de->size);
1143                 if (i == 1) {
1144                         ei->i_next_section_block = block_saved;
1145                         ei->i_next_section_offset = offset_saved;
1146                 }
1147
1148                 more_entries = de->flags[-high_sierra] & 0x80;
1149
1150                 i++;
1151                 if (i > 100)
1152                         goto out_toomany;
1153         } while (more_entries);
1154 out:
1155         kfree(tmpde);
1156         if (bh)
1157                 brelse(bh);
1158         return 0;
1159
1160 out_nomem:
1161         if (bh)
1162                 brelse(bh);
1163         return -ENOMEM;
1164
1165 out_noread:
1166         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1167         kfree(tmpde);
1168         return -EIO;
1169
1170 out_toomany:
1171         printk(KERN_INFO "isofs_read_level3_size: "
1172                 "More than 100 file sections ?!?, aborting...\n"
1173                 "isofs_read_level3_size: inode=%lu\n",
1174                 inode->i_ino);
1175         goto out;
1176 }
1177
1178 static void isofs_read_inode(struct inode *inode)
1179 {
1180         struct super_block *sb = inode->i_sb;
1181         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1182         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1183         unsigned long block;
1184         int high_sierra = sbi->s_high_sierra;
1185         struct buffer_head * bh = NULL;
1186         struct iso_directory_record * de;
1187         struct iso_directory_record * tmpde = NULL;
1188         unsigned int de_len;
1189         unsigned long offset;
1190         struct iso_inode_info *ei = ISOFS_I(inode);
1191
1192         block = ei->i_iget5_block;
1193         bh = sb_bread(inode->i_sb, block);
1194         if (!bh)
1195                 goto out_badread;
1196
1197         offset = ei->i_iget5_offset;
1198
1199         de = (struct iso_directory_record *) (bh->b_data + offset);
1200         de_len = *(unsigned char *) de;
1201
1202         if (offset + de_len > bufsize) {
1203                 int frag1 = bufsize - offset;
1204
1205                 tmpde = kmalloc(de_len, GFP_KERNEL);
1206                 if (tmpde == NULL) {
1207                         printk(KERN_INFO "isofs_read_inode: out of memory\n");
1208                         goto fail;
1209                 }
1210                 memcpy(tmpde, bh->b_data + offset, frag1);
1211                 brelse(bh);
1212                 bh = sb_bread(inode->i_sb, ++block);
1213                 if (!bh)
1214                         goto out_badread;
1215                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1216                 de = tmpde;
1217         }
1218
1219         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1220                                      ei->i_iget5_offset,
1221                                      ISOFS_BUFFER_BITS(inode));
1222
1223         /* Assume it is a normal-format file unless told otherwise */
1224         ei->i_file_format = isofs_file_normal;
1225
1226         if (de->flags[-high_sierra] & 2) {
1227                 inode->i_mode = S_IRUGO | S_IXUGO | S_IFDIR;
1228                 inode->i_nlink = 1; /* Set to 1.  We know there are 2, but
1229                                        the find utility tries to optimize
1230                                        if it is 2, and it screws up.  It is
1231                                        easier to give 1 which tells find to
1232                                        do it the hard way. */
1233         } else {
1234                 /* Everybody gets to read the file. */
1235                 inode->i_mode = sbi->s_mode;
1236                 inode->i_nlink = 1;
1237                 inode->i_mode |= S_IFREG;
1238         }
1239         inode->i_uid = sbi->s_uid;
1240         inode->i_gid = sbi->s_gid;
1241         inode->i_blocks = inode->i_blksize = 0;
1242
1243         ei->i_format_parm[0] = 0;
1244         ei->i_format_parm[1] = 0;
1245         ei->i_format_parm[2] = 0;
1246
1247         ei->i_section_size = isonum_733 (de->size);
1248         if (de->flags[-high_sierra] & 0x80) {
1249                 if(isofs_read_level3_size(inode)) goto fail;
1250         } else {
1251                 ei->i_next_section_block = 0;
1252                 ei->i_next_section_offset = 0;
1253                 inode->i_size = isonum_733 (de->size);
1254         }
1255
1256         /*
1257          * Some dipshit decided to store some other bit of information
1258          * in the high byte of the file length.  Truncate size in case
1259          * this CDROM was mounted with the cruft option.
1260          */
1261
1262         if (sbi->s_cruft == 'y')
1263                 inode->i_size &= 0x00ffffff;
1264
1265         if (de->interleave[0]) {
1266                 printk("Interleaved files not (yet) supported.\n");
1267                 inode->i_size = 0;
1268         }
1269
1270         /* I have no idea what file_unit_size is used for, so
1271            we will flag it for now */
1272         if (de->file_unit_size[0] != 0) {
1273                 printk("File unit size != 0 for ISO file (%ld).\n",
1274                        inode->i_ino);
1275         }
1276
1277         /* I have no idea what other flag bits are used for, so
1278            we will flag it for now */
1279 #ifdef DEBUG
1280         if((de->flags[-high_sierra] & ~2)!= 0){
1281                 printk("Unusual flag settings for ISO file (%ld %x).\n",
1282                        inode->i_ino, de->flags[-high_sierra]);
1283         }
1284 #endif
1285
1286         inode->i_mtime.tv_sec =
1287         inode->i_atime.tv_sec =
1288         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1289         inode->i_mtime.tv_nsec =
1290         inode->i_atime.tv_nsec =
1291         inode->i_ctime.tv_nsec = 0;
1292
1293         ei->i_first_extent = (isonum_733 (de->extent) +
1294                               isonum_711 (de->ext_attr_length));
1295
1296         /* Set the number of blocks for stat() - should be done before RR */
1297         inode->i_blksize = PAGE_CACHE_SIZE; /* For stat() only */
1298         inode->i_blocks  = (inode->i_size + 511) >> 9;
1299
1300         /*
1301          * Now test for possible Rock Ridge extensions which will override
1302          * some of these numbers in the inode structure.
1303          */
1304
1305         if (!high_sierra) {
1306                 parse_rock_ridge_inode(de, inode);
1307                 /* if we want uid/gid set, override the rock ridge setting */
1308                 test_and_set_uid(&inode->i_uid, sbi->s_uid);
1309                 test_and_set_gid(&inode->i_gid, sbi->s_gid);
1310         }
1311
1312         /* Install the inode operations vector */
1313         if (S_ISREG(inode->i_mode)) {
1314                 inode->i_fop = &generic_ro_fops;
1315                 switch ( ei->i_file_format ) {
1316 #ifdef CONFIG_ZISOFS
1317                 case isofs_file_compressed:
1318                         inode->i_data.a_ops = &zisofs_aops;
1319                         break;
1320 #endif
1321                 default:
1322                         inode->i_data.a_ops = &isofs_aops;
1323                         break;
1324                 }
1325         } else if (S_ISDIR(inode->i_mode)) {
1326                 inode->i_op = &isofs_dir_inode_operations;
1327                 inode->i_fop = &isofs_dir_operations;
1328         } else if (S_ISLNK(inode->i_mode)) {
1329                 inode->i_op = &page_symlink_inode_operations;
1330                 inode->i_data.a_ops = &isofs_symlink_aops;
1331         } else
1332                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1333                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1334
1335 out:
1336         kfree(tmpde);
1337         if (bh)
1338                 brelse(bh);
1339         return;
1340
1341 out_badread:
1342         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1343 fail:
1344         make_bad_inode(inode);
1345         goto out;
1346 }
1347
1348 struct isofs_iget5_callback_data {
1349         unsigned long block;
1350         unsigned long offset;
1351 };
1352
1353 static int isofs_iget5_test(struct inode *ino, void *data)
1354 {
1355         struct iso_inode_info *i = ISOFS_I(ino);
1356         struct isofs_iget5_callback_data *d =
1357                 (struct isofs_iget5_callback_data*)data;
1358         return (i->i_iget5_block == d->block)
1359                && (i->i_iget5_offset == d->offset);
1360 }
1361
1362 static int isofs_iget5_set(struct inode *ino, void *data)
1363 {
1364         struct iso_inode_info *i = ISOFS_I(ino);
1365         struct isofs_iget5_callback_data *d =
1366                 (struct isofs_iget5_callback_data*)data;
1367         i->i_iget5_block = d->block;
1368         i->i_iget5_offset = d->offset;
1369         return 0;
1370 }
1371
1372 /* Store, in the inode's containing structure, the block and block
1373  * offset that point to the underlying meta-data for the inode.  The
1374  * code below is otherwise similar to the iget() code in
1375  * include/linux/fs.h */
1376 struct inode *isofs_iget(struct super_block *sb,
1377                          unsigned long block,
1378                          unsigned long offset)
1379 {
1380         unsigned long hashval;
1381         struct inode *inode;
1382         struct isofs_iget5_callback_data data;
1383
1384         if (offset >= 1ul << sb->s_blocksize_bits)
1385                 return NULL;
1386
1387         data.block = block;
1388         data.offset = offset;
1389
1390         hashval = (block << sb->s_blocksize_bits) | offset;
1391
1392         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1393                              &isofs_iget5_set, &data);
1394
1395         if (inode && (inode->i_state & I_NEW)) {
1396                 sb->s_op->read_inode(inode);
1397                 unlock_new_inode(inode);
1398         }
1399
1400         return inode;
1401 }
1402
1403 static int isofs_get_sb(struct file_system_type *fs_type,
1404         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1405 {
1406         return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1407                            mnt);
1408 }
1409
1410 static struct file_system_type iso9660_fs_type = {
1411         .owner          = THIS_MODULE,
1412         .name           = "iso9660",
1413         .get_sb         = isofs_get_sb,
1414         .kill_sb        = kill_block_super,
1415         .fs_flags       = FS_REQUIRES_DEV,
1416 };
1417
1418 static int __init init_iso9660_fs(void)
1419 {
1420         int err = init_inodecache();
1421         if (err)
1422                 goto out;
1423 #ifdef CONFIG_ZISOFS
1424         err = zisofs_init();
1425         if (err)
1426                 goto out1;
1427 #endif
1428         err = register_filesystem(&iso9660_fs_type);
1429         if (err)
1430                 goto out2;
1431         return 0;
1432 out2:
1433 #ifdef CONFIG_ZISOFS
1434         zisofs_cleanup();
1435 out1:
1436 #endif
1437         destroy_inodecache();
1438 out:
1439         return err;
1440 }
1441
1442 static void __exit exit_iso9660_fs(void)
1443 {
1444         unregister_filesystem(&iso9660_fs_type);
1445 #ifdef CONFIG_ZISOFS
1446         zisofs_cleanup();
1447 #endif
1448         destroy_inodecache();
1449 }
1450
1451 module_init(init_iso9660_fs)
1452 module_exit(exit_iso9660_fs)
1453 MODULE_LICENSE("GPL");
1454 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1455 MODULE_ALIAS("iso9660");