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