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 Mönkeberg - 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
  46 #ifdef CONFIG_JOLIET
  47         lock_kernel();
  48
  49         if (sbi->s_nls_iocharset) {
  50                 unload_nls(sbi->s_nls_iocharset);
  51                 sbi->s_nls_iocharset = NULL;
  52         }
  53
  54         unlock_kernel();
  55 #endif
  56
  57         kfree(sbi);
  58         sb->s_fs_info = NULL;
  59         return;
  60 }
  61
  62 static int isofs_read_inode(struct inode *);
  63 static int isofs_statfs (struct dentry *, struct kstatfs *);
  64
  65 static struct kmem_cache *isofs_inode_cachep;
  66
  67 static struct inode *isofs_alloc_inode(struct super_block *sb)
  68 {
  69         struct iso_inode_info *ei;
  70         ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
  71         if (!ei)
  72                 return NULL;
  73         return &ei->vfs_inode;
  74 }
  75
  76 static void isofs_destroy_inode(struct inode *inode)
  77 {
  78         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
  79 }
  80
  81 static void init_once(void *foo)
  82 {
  83         struct iso_inode_info *ei = foo;
  84
  85         inode_init_once(&ei->vfs_inode);
  86 }
  87
  88 static int init_inodecache(void)
  89 {
  90         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
  91                                         sizeof(struct iso_inode_info),
  92                                         0, (SLAB_RECLAIM_ACCOUNT|
  93                                         SLAB_MEM_SPREAD),
  94                                         init_once);
  95         if (isofs_inode_cachep == NULL)
  96                 return -ENOMEM;
  97         return 0;
  98 }
  99
 100 static void destroy_inodecache(void)
 101 {
 102         kmem_cache_destroy(isofs_inode_cachep);
 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 const struct super_operations isofs_sops = {
 113         .alloc_inode    = isofs_alloc_inode,
 114         .destroy_inode  = isofs_destroy_inode,
 115         .put_super      = isofs_put_super,
 116         .statfs         = isofs_statfs,
 117         .remount_fs     = isofs_remount,
 118         .show_options   = generic_show_options,
 119 };
 120
 121
 122 static const 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         unsigned int rock:1;
 145         unsigned int cruft:1;
 146         unsigned int hide:1;
 147         unsigned int showassoc:1;
 148         unsigned int nocompress:1;
 149         unsigned int overriderockperm:1;
 150         unsigned int uid_set:1;
 151         unsigned int gid_set:1;
 152         unsigned int utf8:1;
 153         unsigned char map;
 154         char joliet;
 155         unsigned char check;
 156         unsigned int blocksize;
 157         mode_t fmode;
 158         mode_t dmode;
 159         gid_t gid;
 160         uid_t uid;
 161         char *iocharset;
 162         /* LVE */
 163         s32 session;
 164         s32 sbsector;
 165 };
 166
 167 /*
 168  * Compute the hash for the isofs name corresponding to the dentry.
 169  */
 170 static int
 171 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
 172 {
 173         const char *name;
 174         int len;
 175
 176         len = qstr->len;
 177         name = qstr->name;
 178         if (ms) {
 179                 while (len && name[len-1] == '.')
 180                         len--;
 181         }
 182
 183         qstr->hash = full_name_hash(name, len);
 184
 185         return 0;
 186 }
 187
 188 /*
 189  * Compute the hash for the isofs name corresponding to the dentry.
 190  */
 191 static int
 192 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
 193 {
 194         const char *name;
 195         int len;
 196         char c;
 197         unsigned long hash;
 198
 199         len = qstr->len;
 200         name = qstr->name;
 201         if (ms) {
 202                 while (len && name[len-1] == '.')
 203                         len--;
 204         }
 205
 206         hash = init_name_hash();
 207         while (len--) {
 208                 c = tolower(*name++);
 209                 hash = partial_name_hash(c, hash);
 210         }
 211         qstr->hash = end_name_hash(hash);
 212
 213         return 0;
 214 }
 215
 216 /*
 217  * Case insensitive compare of two isofs names.
 218  */
 219 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
 220                                 struct qstr *b, int ms)
 221 {
 222         int alen, blen;
 223
 224         /* A filename cannot end in '.' or we treat it like it has none */
 225         alen = a->len;
 226         blen = b->len;
 227         if (ms) {
 228                 while (alen && a->name[alen-1] == '.')
 229                         alen--;
 230                 while (blen && b->name[blen-1] == '.')
 231                         blen--;
 232         }
 233         if (alen == blen) {
 234                 if (strnicmp(a->name, b->name, alen) == 0)
 235                         return 0;
 236         }
 237         return 1;
 238 }
 239
 240 /*
 241  * Case sensitive compare of two isofs names.
 242  */
 243 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
 244                                         struct qstr *b, int ms)
 245 {
 246         int alen, blen;
 247
 248         /* A filename cannot end in '.' or we treat it like it has none */
 249         alen = a->len;
 250         blen = b->len;
 251         if (ms) {
 252                 while (alen && a->name[alen-1] == '.')
 253                         alen--;
 254                 while (blen && b->name[blen-1] == '.')
 255                         blen--;
 256         }
 257         if (alen == blen) {
 258                 if (strncmp(a->name, b->name, alen) == 0)
 259                         return 0;
 260         }
 261         return 1;
 262 }
 263
 264 static int
 265 isofs_hash(struct dentry *dentry, struct qstr *qstr)
 266 {
 267         return isofs_hash_common(dentry, qstr, 0);
 268 }
 269
 270 static int
 271 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
 272 {
 273         return isofs_hashi_common(dentry, qstr, 0);
 274 }
 275
 276 static int
 277 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
 278 {
 279         return isofs_dentry_cmp_common(dentry, a, b, 0);
 280 }
 281
 282 static int
 283 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
 284 {
 285         return isofs_dentry_cmpi_common(dentry, a, b, 0);
 286 }
 287
 288 #ifdef CONFIG_JOLIET
 289 static int
 290 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
 291 {
 292         return isofs_hash_common(dentry, qstr, 1);
 293 }
 294
 295 static int
 296 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
 297 {
 298         return isofs_hashi_common(dentry, qstr, 1);
 299 }
 300
 301 static int
 302 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
 303 {
 304         return isofs_dentry_cmp_common(dentry, a, b, 1);
 305 }
 306
 307 static int
 308 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
 309 {
 310         return isofs_dentry_cmpi_common(dentry, a, b, 1);
 311 }
 312 #endif
 313
 314 enum {
 315         Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
 316         Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
 317         Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
 318         Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
 319 };
 320
 321 static const match_table_t tokens = {
 322         {Opt_norock, "norock"},
 323         {Opt_nojoliet, "nojoliet"},
 324         {Opt_unhide, "unhide"},
 325         {Opt_hide, "hide"},
 326         {Opt_showassoc, "showassoc"},
 327         {Opt_cruft, "cruft"},
 328         {Opt_utf8, "utf8"},
 329         {Opt_iocharset, "iocharset=%s"},
 330         {Opt_map_a, "map=acorn"},
 331         {Opt_map_a, "map=a"},
 332         {Opt_map_n, "map=normal"},
 333         {Opt_map_n, "map=n"},
 334         {Opt_map_o, "map=off"},
 335         {Opt_map_o, "map=o"},
 336         {Opt_session, "session=%u"},
 337         {Opt_sb, "sbsector=%u"},
 338         {Opt_check_r, "check=relaxed"},
 339         {Opt_check_r, "check=r"},
 340         {Opt_check_s, "check=strict"},
 341         {Opt_check_s, "check=s"},
 342         {Opt_uid, "uid=%u"},
 343         {Opt_gid, "gid=%u"},
 344         {Opt_mode, "mode=%u"},
 345         {Opt_dmode, "dmode=%u"},
 346         {Opt_overriderockperm, "overriderockperm"},
 347         {Opt_block, "block=%u"},
 348         {Opt_ignore, "conv=binary"},
 349         {Opt_ignore, "conv=b"},
 350         {Opt_ignore, "conv=text"},
 351         {Opt_ignore, "conv=t"},
 352         {Opt_ignore, "conv=mtext"},
 353         {Opt_ignore, "conv=m"},
 354         {Opt_ignore, "conv=auto"},
 355         {Opt_ignore, "conv=a"},
 356         {Opt_nocompress, "nocompress"},
 357         {Opt_err, NULL}
 358 };
 359
 360 static int parse_options(char *options, struct iso9660_options *popt)
 361 {
 362         char *p;
 363         int option;
 364
 365         popt->map = 'n';
 366         popt->rock = 1;
 367         popt->joliet = 1;
 368         popt->cruft = 0;
 369         popt->hide = 0;
 370         popt->showassoc = 0;
 371         popt->check = 'u';              /* unset */
 372         popt->nocompress = 0;
 373         popt->blocksize = 1024;
 374         popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
 375         popt->uid_set = 0;
 376         popt->gid_set = 0;
 377         popt->gid = 0;
 378         popt->uid = 0;
 379         popt->iocharset = NULL;
 380         popt->utf8 = 0;
 381         popt->overriderockperm = 0;
 382         popt->session=-1;
 383         popt->sbsector=-1;
 384         if (!options)
 385                 return 1;
 386
 387         while ((p = strsep(&options, ",")) != NULL) {
 388                 int token;
 389                 substring_t args[MAX_OPT_ARGS];
 390                 unsigned n;
 391
 392                 if (!*p)
 393                         continue;
 394
 395                 token = match_token(p, tokens, args);
 396                 switch (token) {
 397                 case Opt_norock:
 398                         popt->rock = 0;
 399                         break;
 400                 case Opt_nojoliet:
 401                         popt->joliet = 0;
 402                         break;
 403                 case Opt_hide:
 404                         popt->hide = 1;
 405                         break;
 406                 case Opt_unhide:
 407                 case Opt_showassoc:
 408                         popt->showassoc = 1;
 409                         break;
 410                 case Opt_cruft:
 411                         popt->cruft = 1;
 412                         break;
 413                 case Opt_utf8:
 414                         popt->utf8 = 1;
 415                         break;
 416 #ifdef CONFIG_JOLIET
 417                 case Opt_iocharset:
 418                         popt->iocharset = match_strdup(&args[0]);
 419                         break;
 420 #endif
 421                 case Opt_map_a:
 422                         popt->map = 'a';
 423                         break;
 424                 case Opt_map_o:
 425                         popt->map = 'o';
 426                         break;
 427                 case Opt_map_n:
 428                         popt->map = 'n';
 429                         break;
 430                 case Opt_session:
 431                         if (match_int(&args[0], &option))
 432                                 return 0;
 433                         n = option;
 434                         if (n > 99)
 435                                 return 0;
 436                         popt->session = n + 1;
 437                         break;
 438                 case Opt_sb:
 439                         if (match_int(&args[0], &option))
 440                                 return 0;
 441                         popt->sbsector = option;
 442                         break;
 443                 case Opt_check_r:
 444                         popt->check = 'r';
 445                         break;
 446                 case Opt_check_s:
 447                         popt->check = 's';
 448                         break;
 449                 case Opt_ignore:
 450                         break;
 451                 case Opt_uid:
 452                         if (match_int(&args[0], &option))
 453                                 return 0;
 454                         popt->uid = option;
 455                         popt->uid_set = 1;
 456                         break;
 457                 case Opt_gid:
 458                         if (match_int(&args[0], &option))
 459                                 return 0;
 460                         popt->gid = option;
 461                         popt->gid_set = 1;
 462                         break;
 463                 case Opt_mode:
 464                         if (match_int(&args[0], &option))
 465                                 return 0;
 466                         popt->fmode = option;
 467                         break;
 468                 case Opt_dmode:
 469                         if (match_int(&args[0], &option))
 470                                 return 0;
 471                         popt->dmode = option;
 472                         break;
 473                 case Opt_overriderockperm:
 474                         popt->overriderockperm = 1;
 475                         break;
 476                 case Opt_block:
 477                         if (match_int(&args[0], &option))
 478                                 return 0;
 479                         n = option;
 480                         if (n != 512 && n != 1024 && n != 2048)
 481                                 return 0;
 482                         popt->blocksize = n;
 483                         break;
 484                 case Opt_nocompress:
 485                         popt->nocompress = 1;
 486                         break;
 487                 default:
 488                         return 0;
 489                 }
 490         }
 491         return 1;
 492 }
 493
 494 /*
 495  * look if the driver can tell the multi session redirection value
 496  *
 497  * don't change this if you don't know what you do, please!
 498  * Multisession is legal only with XA disks.
 499  * A non-XA disk with more than one volume descriptor may do it right, but
 500  * usually is written in a nowhere standardized "multi-partition" manner.
 501  * Multisession uses absolute addressing (solely the first frame of the whole
 502  * track is #0), multi-partition uses relative addressing (each first frame of
 503  * each track is #0), and a track is not a session.
 504  *
 505  * A broken CDwriter software or drive firmware does not set new standards,
 506  * at least not if conflicting with the existing ones.
 507  *
 508  * emoenke@gwdg.de
 509  */
 510 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
 511
 512 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
 513 {
 514         struct cdrom_multisession ms_info;
 515         unsigned int vol_desc_start;
 516         struct block_device *bdev = sb->s_bdev;
 517         int i;
 518
 519         vol_desc_start=0;
 520         ms_info.addr_format=CDROM_LBA;
 521         if(session >= 0 && session <= 99) {
 522                 struct cdrom_tocentry Te;
 523                 Te.cdte_track=session;
 524                 Te.cdte_format=CDROM_LBA;
 525                 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
 526                 if (!i) {
 527                         printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
 528                                 session, Te.cdte_addr.lba,
 529                                 Te.cdte_ctrl&CDROM_DATA_TRACK);
 530                         if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
 531                                 return Te.cdte_addr.lba;
 532                 }
 533
 534                 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
 535         }
 536         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
 537         if (session > 0)
 538                 printk(KERN_ERR "ISOFS: Invalid session number\n");
 539 #if 0
 540         printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
 541         if (i==0) {
 542                 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
 543                 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
 544         }
 545 #endif
 546         if (i==0)
 547 #if WE_OBEY_THE_WRITTEN_STANDARDS
 548                 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
 549 #endif
 550                         vol_desc_start=ms_info.addr.lba;
 551         return vol_desc_start;
 552 }
 553
 554 /*
 555  * Initialize the superblock and read the root inode.
 556  *
 557  * Note: a check_disk_change() has been done immediately prior
 558  * to this call, so we don't need to check again.
 559  */
 560 static int isofs_fill_super(struct super_block *s, void *data, int silent)
 561 {
 562         struct buffer_head *bh = NULL, *pri_bh = NULL;
 563         struct hs_primary_descriptor *h_pri = NULL;
 564         struct iso_primary_descriptor *pri = NULL;
 565         struct iso_supplementary_descriptor *sec = NULL;
 566         struct iso_directory_record *rootp;
 567         struct inode *inode;
 568         struct iso9660_options opt;
 569         struct isofs_sb_info *sbi;
 570         unsigned long first_data_zone;
 571         int joliet_level = 0;
 572         int iso_blknum, block;
 573         int orig_zonesize;
 574         int table, error = -EINVAL;
 575         unsigned int vol_desc_start;
 576
 577         save_mount_options(s, data);
 578
 579         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 580         if (!sbi)
 581                 return -ENOMEM;
 582         s->s_fs_info = sbi;
 583
 584         if (!parse_options((char *)data, &opt))
 585                 goto out_freesbi;
 586
 587         /*
 588          * First of all, get the hardware blocksize for this device.
 589          * If we don't know what it is, or the hardware blocksize is
 590          * larger than the blocksize the user specified, then use
 591          * that value.
 592          */
 593         /*
 594          * What if bugger tells us to go beyond page size?
 595          */
 596         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
 597
 598         sbi->s_high_sierra = 0; /* default is iso9660 */
 599
 600         vol_desc_start = (opt.sbsector != -1) ?
 601                 opt.sbsector : isofs_get_last_session(s,opt.session);
 602
 603         for (iso_blknum = vol_desc_start+16;
 604                 iso_blknum < vol_desc_start+100; iso_blknum++) {
 605                 struct hs_volume_descriptor *hdp;
 606                 struct iso_volume_descriptor  *vdp;
 607
 608                 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
 609                 if (!(bh = sb_bread(s, block)))
 610                         goto out_no_read;
 611
 612                 vdp = (struct iso_volume_descriptor *)bh->b_data;
 613                 hdp = (struct hs_volume_descriptor *)bh->b_data;
 614
 615                 /*
 616                  * Due to the overlapping physical location of the descriptors,
 617                  * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
 618                  * proper identification in this case, we first check for ISO.
 619                  */
 620                 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
 621                         if (isonum_711(vdp->type) == ISO_VD_END)
 622                                 break;
 623                         if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
 624                                 if (pri == NULL) {
 625                                         pri = (struct iso_primary_descriptor *)vdp;
 626                                         /* Save the buffer in case we need it ... */
 627                                         pri_bh = bh;
 628                                         bh = NULL;
 629                                 }
 630                         }
 631 #ifdef CONFIG_JOLIET
 632                         else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
 633                                 sec = (struct iso_supplementary_descriptor *)vdp;
 634                                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
 635                                         if (opt.joliet == 'y') {
 636                                                 if (sec->escape[2] == 0x40)
 637                                                         joliet_level = 1;
 638                                                 else if (sec->escape[2] == 0x43)
 639                                                         joliet_level = 2;
 640                                                 else if (sec->escape[2] == 0x45)
 641                                                         joliet_level = 3;
 642
 643                                                 printk(KERN_DEBUG "ISO 9660 Extensions: "
 644                                                         "Microsoft Joliet Level %d\n",
 645                                                         joliet_level);
 646                                         }
 647                                         goto root_found;
 648                                 } else {
 649                                 /* Unknown supplementary volume descriptor */
 650                                 sec = NULL;
 651                                 }
 652                         }
 653 #endif
 654                 } else {
 655                         if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
 656                                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
 657                                         goto out_freebh;
 658
 659                                 sbi->s_high_sierra = 1;
 660                                 opt.rock = 0;
 661                                 h_pri = (struct hs_primary_descriptor *)vdp;
 662                                 goto root_found;
 663                         }
 664                 }
 665
 666                 /* Just skip any volume descriptors we don't recognize */
 667
 668                 brelse(bh);
 669                 bh = NULL;
 670         }
 671         /*
 672          * If we fall through, either no volume descriptor was found,
 673          * or else we passed a primary descriptor looking for others.
 674          */
 675         if (!pri)
 676                 goto out_unknown_format;
 677         brelse(bh);
 678         bh = pri_bh;
 679         pri_bh = NULL;
 680
 681 root_found:
 682
 683         if (joliet_level && (pri == NULL || !opt.rock)) {
 684                 /* This is the case of Joliet with the norock mount flag.
 685                  * A disc with both Joliet and Rock Ridge is handled later
 686                  */
 687                 pri = (struct iso_primary_descriptor *) sec;
 688         }
 689
 690         if(sbi->s_high_sierra){
 691                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
 692                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
 693                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
 694                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
 695         } else {
 696                 if (!pri)
 697                         goto out_freebh;
 698                 rootp = (struct iso_directory_record *) pri->root_directory_record;
 699                 sbi->s_nzones = isonum_733(pri->volume_space_size);
 700                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
 701                 sbi->s_max_size = isonum_733(pri->volume_space_size);
 702         }
 703
 704         sbi->s_ninodes = 0; /* No way to figure this out easily */
 705
 706         orig_zonesize = sbi->s_log_zone_size;
 707         /*
 708          * If the zone size is smaller than the hardware sector size,
 709          * this is a fatal error.  This would occur if the disc drive
 710          * had sectors that were 2048 bytes, but the filesystem had
 711          * blocks that were 512 bytes (which should only very rarely
 712          * happen.)
 713          */
 714         if (orig_zonesize < opt.blocksize)
 715                 goto out_bad_size;
 716
 717         /* RDE: convert log zone size to bit shift */
 718         switch (sbi->s_log_zone_size) {
 719         case  512: sbi->s_log_zone_size =  9; break;
 720         case 1024: sbi->s_log_zone_size = 10; break;
 721         case 2048: sbi->s_log_zone_size = 11; break;
 722
 723         default:
 724                 goto out_bad_zone_size;
 725         }
 726
 727         s->s_magic = ISOFS_SUPER_MAGIC;
 728         s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
 729
 730         /*
 731          * The CDROM is read-only, has no nodes (devices) on it, and since
 732          * all of the files appear to be owned by root, we really do not want
 733          * to allow suid.  (suid or devices will not show up unless we have
 734          * Rock Ridge extensions)
 735          */
 736
 737         s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
 738
 739         /* Set this for reference. Its not currently used except on write
 740            which we don't have .. */
 741
 742         first_data_zone = isonum_733(rootp->extent) +
 743                           isonum_711(rootp->ext_attr_length);
 744         sbi->s_firstdatazone = first_data_zone;
 745 #ifndef BEQUIET
 746         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
 747                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
 748         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
 749         if(sbi->s_high_sierra)
 750                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
 751 #endif
 752
 753         /*
 754          * If the Joliet level is set, we _may_ decide to use the
 755          * secondary descriptor, but can't be sure until after we
 756          * read the root inode. But before reading the root inode
 757          * we may need to change the device blocksize, and would
 758          * rather release the old buffer first. So, we cache the
 759          * first_data_zone value from the secondary descriptor.
 760          */
 761         if (joliet_level) {
 762                 pri = (struct iso_primary_descriptor *) sec;
 763                 rootp = (struct iso_directory_record *)
 764                         pri->root_directory_record;
 765                 first_data_zone = isonum_733(rootp->extent) +
 766                                 isonum_711(rootp->ext_attr_length);
 767         }
 768
 769         /*
 770          * We're all done using the volume descriptor, and may need
 771          * to change the device blocksize, so release the buffer now.
 772          */
 773         brelse(pri_bh);
 774         brelse(bh);
 775
 776         /*
 777          * Force the blocksize to 512 for 512 byte sectors.  The file
 778          * read primitives really get it wrong in a bad way if we don't
 779          * do this.
 780          *
 781          * Note - we should never be setting the blocksize to something
 782          * less than the hardware sector size for the device.  If we
 783          * do, we would end up having to read larger buffers and split
 784          * out portions to satisfy requests.
 785          *
 786          * Note2- the idea here is that we want to deal with the optimal
 787          * zonesize in the filesystem.  If we have it set to something less,
 788          * then we have horrible problems with trying to piece together
 789          * bits of adjacent blocks in order to properly read directory
 790          * entries.  By forcing the blocksize in this way, we ensure
 791          * that we will never be required to do this.
 792          */
 793         sb_set_blocksize(s, orig_zonesize);
 794
 795         sbi->s_nls_iocharset = NULL;
 796
 797 #ifdef CONFIG_JOLIET
 798         if (joliet_level && opt.utf8 == 0) {
 799                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
 800                 sbi->s_nls_iocharset = load_nls(p);
 801                 if (! sbi->s_nls_iocharset) {
 802                         /* Fail only if explicit charset specified */
 803                         if (opt.iocharset)
 804                                 goto out_freesbi;
 805                         sbi->s_nls_iocharset = load_nls_default();
 806                 }
 807         }
 808 #endif
 809         s->s_op = &isofs_sops;
 810         s->s_export_op = &isofs_export_ops;
 811         sbi->s_mapping = opt.map;
 812         sbi->s_rock = (opt.rock ? 2 : 0);
 813         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
 814         sbi->s_cruft = opt.cruft;
 815         sbi->s_hide = opt.hide;
 816         sbi->s_showassoc = opt.showassoc;
 817         sbi->s_uid = opt.uid;
 818         sbi->s_gid = opt.gid;
 819         sbi->s_uid_set = opt.uid_set;
 820         sbi->s_gid_set = opt.gid_set;
 821         sbi->s_utf8 = opt.utf8;
 822         sbi->s_nocompress = opt.nocompress;
 823         sbi->s_overriderockperm = opt.overriderockperm;
 824         /*
 825          * It would be incredibly stupid to allow people to mark every file
 826          * on the disk as suid, so we merely allow them to set the default
 827          * permissions.
 828          */
 829         if (opt.fmode != ISOFS_INVALID_MODE)
 830                 sbi->s_fmode = opt.fmode & 0777;
 831         else
 832                 sbi->s_fmode = ISOFS_INVALID_MODE;
 833         if (opt.dmode != ISOFS_INVALID_MODE)
 834                 sbi->s_dmode = opt.dmode & 0777;
 835         else
 836                 sbi->s_dmode = ISOFS_INVALID_MODE;
 837
 838         /*
 839          * Read the root inode, which _may_ result in changing
 840          * the s_rock flag. Once we have the final s_rock value,
 841          * we then decide whether to use the Joliet descriptor.
 842          */
 843         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 844         if (IS_ERR(inode))
 845                 goto out_no_root;
 846
 847         /*
 848          * If this disk has both Rock Ridge and Joliet on it, then we
 849          * want to use Rock Ridge by default.  This can be overridden
 850          * by using the norock mount option.  There is still one other
 851          * possibility that is not taken into account: a Rock Ridge
 852          * CD with Unicode names.  Until someone sees such a beast, it
 853          * will not be supported.
 854          */
 855         if (sbi->s_rock == 1) {
 856                 joliet_level = 0;
 857         } else if (joliet_level) {
 858                 sbi->s_rock = 0;
 859                 if (sbi->s_firstdatazone != first_data_zone) {
 860                         sbi->s_firstdatazone = first_data_zone;
 861                         printk(KERN_DEBUG
 862                                 "ISOFS: changing to secondary root\n");
 863                         iput(inode);
 864                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 865                         if (IS_ERR(inode))
 866                                 goto out_no_root;
 867                 }
 868         }
 869
 870         if (opt.check == 'u') {
 871                 /* Only Joliet is case insensitive by default */
 872                 if (joliet_level)
 873                         opt.check = 'r';
 874                 else
 875                         opt.check = 's';
 876         }
 877         sbi->s_joliet_level = joliet_level;
 878
 879         /* Make sure the root inode is a directory */
 880         if (!S_ISDIR(inode->i_mode)) {
 881                 printk(KERN_WARNING
 882                         "isofs_fill_super: root inode is not a directory. "
 883                         "Corrupted media?\n");
 884                 goto out_iput;
 885         }
 886
 887         /* get the root dentry */
 888         s->s_root = d_alloc_root(inode);
 889         if (!(s->s_root))
 890                 goto out_no_root;
 891
 892         table = 0;
 893         if (joliet_level)
 894                 table += 2;
 895         if (opt.check == 'r')
 896                 table++;
 897         s->s_root->d_op = &isofs_dentry_ops[table];
 898
 899         kfree(opt.iocharset);
 900
 901         return 0;
 902
 903         /*
 904          * Display error messages and free resources.
 905          */
 906 out_iput:
 907         iput(inode);
 908         goto out_no_inode;
 909 out_no_root:
 910         error = PTR_ERR(inode);
 911         if (error != -ENOMEM)
 912                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
 913 out_no_inode:
 914 #ifdef CONFIG_JOLIET
 915         if (sbi->s_nls_iocharset)
 916                 unload_nls(sbi->s_nls_iocharset);
 917 #endif
 918         goto out_freesbi;
 919 out_no_read:
 920         printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
 921                 __func__, s->s_id, iso_blknum, block);
 922         goto out_freesbi;
 923 out_bad_zone_size:
 924         printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
 925                 sbi->s_log_zone_size);
 926         goto out_freebh;
 927 out_bad_size:
 928         printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
 929                 orig_zonesize, opt.blocksize);
 930         goto out_freebh;
 931 out_unknown_format:
 932         if (!silent)
 933                 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
 934
 935 out_freebh:
 936         brelse(bh);
 937 out_freesbi:
 938         kfree(opt.iocharset);
 939         kfree(sbi);
 940         s->s_fs_info = NULL;
 941         return error;
 942 }
 943
 944 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
 945 {
 946         struct super_block *sb = dentry->d_sb;
 947         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 948
 949         buf->f_type = ISOFS_SUPER_MAGIC;
 950         buf->f_bsize = sb->s_blocksize;
 951         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
 952                 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
 953         buf->f_bfree = 0;
 954         buf->f_bavail = 0;
 955         buf->f_files = ISOFS_SB(sb)->s_ninodes;
 956         buf->f_ffree = 0;
 957         buf->f_fsid.val[0] = (u32)id;
 958         buf->f_fsid.val[1] = (u32)(id >> 32);
 959         buf->f_namelen = NAME_MAX;
 960         return 0;
 961 }
 962
 963 /*
 964  * Get a set of blocks; filling in buffer_heads if already allocated
 965  * or getblk() if they are not.  Returns the number of blocks inserted
 966  * (-ve == error.)
 967  */
 968 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
 969                      struct buffer_head **bh, unsigned long nblocks)
 970 {
 971         unsigned long b_off;
 972         unsigned offset, sect_size;
 973         unsigned int firstext;
 974         unsigned long nextblk, nextoff;
 975         long iblock = (long)iblock_s;
 976         int section, rv, error;
 977         struct iso_inode_info *ei = ISOFS_I(inode);
 978
 979         lock_kernel();
 980
 981         error = -EIO;
 982         rv = 0;
 983         if (iblock < 0 || iblock != iblock_s) {
 984                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
 985                 goto abort;
 986         }
 987
 988         b_off = iblock;
 989
 990         offset = 0;
 991         firstext = ei->i_first_extent;
 992         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
 993         nextblk = ei->i_next_section_block;
 994         nextoff = ei->i_next_section_offset;
 995         section = 0;
 996
 997         while (nblocks) {
 998                 /* If we are *way* beyond the end of the file, print a message.
 999                  * Access beyond the end of the file up to the next page boundary
1000                  * is normal, however because of the way the page cache works.
1001                  * In this case, we just return 0 so that we can properly fill
1002                  * the page with useless information without generating any
1003                  * I/O errors.
1004                  */
1005                 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1006                         printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
1007                                 __func__, iblock, (unsigned long) inode->i_size);
1008                         goto abort;
1009                 }
1010
1011                 /* On the last section, nextblk == 0, section size is likely to
1012                  * exceed sect_size by a partial block, and access beyond the
1013                  * end of the file will reach beyond the section size, too.
1014                  */
1015                 while (nextblk && (b_off >= (offset + sect_size))) {
1016                         struct inode *ninode;
1017
1018                         offset += sect_size;
1019                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1020                         if (IS_ERR(ninode)) {
1021                                 error = PTR_ERR(ninode);
1022                                 goto abort;
1023                         }
1024                         firstext  = ISOFS_I(ninode)->i_first_extent;
1025                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1026                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
1027                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1028                         iput(ninode);
1029
1030                         if (++section > 100) {
1031                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1032                                         " aborting...\n", __func__);
1033                                 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1034                                         "nextblk=%lu nextoff=%lu\n", __func__,
1035                                         iblock, firstext, (unsigned) sect_size,
1036                                         nextblk, nextoff);
1037                                 goto abort;
1038                         }
1039                 }
1040
1041                 if (*bh) {
1042                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1043                 } else {
1044                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1045                         if (!*bh)
1046                                 goto abort;
1047                 }
1048                 bh++;   /* Next buffer head */
1049                 b_off++;        /* Next buffer offset */
1050                 nblocks--;
1051                 rv++;
1052         }
1053
1054         error = 0;
1055 abort:
1056         unlock_kernel();
1057         return rv != 0 ? rv : error;
1058 }
1059
1060 /*
1061  * Used by the standard interfaces.
1062  */
1063 static int isofs_get_block(struct inode *inode, sector_t iblock,
1064                     struct buffer_head *bh_result, int create)
1065 {
1066         int ret;
1067
1068         if (create) {
1069                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1070                 return -EROFS;
1071         }
1072
1073         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1074         return ret < 0 ? ret : 0;
1075 }
1076
1077 static int isofs_bmap(struct inode *inode, sector_t block)
1078 {
1079         struct buffer_head dummy;
1080         int error;
1081
1082         dummy.b_state = 0;
1083         dummy.b_blocknr = -1000;
1084         error = isofs_get_block(inode, block, &dummy, 0);
1085         if (!error)
1086                 return dummy.b_blocknr;
1087         return 0;
1088 }
1089
1090 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1091 {
1092         sector_t blknr = isofs_bmap(inode, block);
1093         if (!blknr)
1094                 return NULL;
1095         return sb_bread(inode->i_sb, blknr);
1096 }
1097
1098 static int isofs_readpage(struct file *file, struct page *page)
1099 {
1100         return block_read_full_page(page,isofs_get_block);
1101 }
1102
1103 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1104 {
1105         return generic_block_bmap(mapping,block,isofs_get_block);
1106 }
1107
1108 static const struct address_space_operations isofs_aops = {
1109         .readpage = isofs_readpage,
1110         .sync_page = block_sync_page,
1111         .bmap = _isofs_bmap
1112 };
1113
1114 static int isofs_read_level3_size(struct inode *inode)
1115 {
1116         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1117         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1118         struct buffer_head *bh = NULL;
1119         unsigned long block, offset, block_saved, offset_saved;
1120         int i = 0;
1121         int more_entries = 0;
1122         struct iso_directory_record *tmpde = NULL;
1123         struct iso_inode_info *ei = ISOFS_I(inode);
1124
1125         inode->i_size = 0;
1126
1127         /* The first 16 blocks are reserved as the System Area.  Thus,
1128          * no inodes can appear in block 0.  We use this to flag that
1129          * this is the last section. */
1130         ei->i_next_section_block = 0;
1131         ei->i_next_section_offset = 0;
1132
1133         block = ei->i_iget5_block;
1134         offset = ei->i_iget5_offset;
1135
1136         do {
1137                 struct iso_directory_record *de;
1138                 unsigned int de_len;
1139
1140                 if (!bh) {
1141                         bh = sb_bread(inode->i_sb, block);
1142                         if (!bh)
1143                                 goto out_noread;
1144                 }
1145                 de = (struct iso_directory_record *) (bh->b_data + offset);
1146                 de_len = *(unsigned char *) de;
1147
1148                 if (de_len == 0) {
1149                         brelse(bh);
1150                         bh = NULL;
1151                         ++block;
1152                         offset = 0;
1153                         continue;
1154                 }
1155
1156                 block_saved = block;
1157                 offset_saved = offset;
1158                 offset += de_len;
1159
1160                 /* Make sure we have a full directory entry */
1161                 if (offset >= bufsize) {
1162                         int slop = bufsize - offset + de_len;
1163                         if (!tmpde) {
1164                                 tmpde = kmalloc(256, GFP_KERNEL);
1165                                 if (!tmpde)
1166                                         goto out_nomem;
1167                         }
1168                         memcpy(tmpde, de, slop);
1169                         offset &= bufsize - 1;
1170                         block++;
1171                         brelse(bh);
1172                         bh = NULL;
1173                         if (offset) {
1174                                 bh = sb_bread(inode->i_sb, block);
1175                                 if (!bh)
1176                                         goto out_noread;
1177                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1178                         }
1179                         de = tmpde;
1180                 }
1181
1182                 inode->i_size += isonum_733(de->size);
1183                 if (i == 1) {
1184                         ei->i_next_section_block = block_saved;
1185                         ei->i_next_section_offset = offset_saved;
1186                 }
1187
1188                 more_entries = de->flags[-high_sierra] & 0x80;
1189
1190                 i++;
1191                 if (i > 100)
1192                         goto out_toomany;
1193         } while (more_entries);
1194 out:
1195         kfree(tmpde);
1196         if (bh)
1197                 brelse(bh);
1198         return 0;
1199
1200 out_nomem:
1201         if (bh)
1202                 brelse(bh);
1203         return -ENOMEM;
1204
1205 out_noread:
1206         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1207         kfree(tmpde);
1208         return -EIO;
1209
1210 out_toomany:
1211         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1212                 "isofs_read_level3_size: inode=%lu\n",
1213                 __func__, inode->i_ino);
1214         goto out;
1215 }
1216
1217 static int isofs_read_inode(struct inode *inode)
1218 {
1219         struct super_block *sb = inode->i_sb;
1220         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1221         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1222         unsigned long block;
1223         int high_sierra = sbi->s_high_sierra;
1224         struct buffer_head *bh = NULL;
1225         struct iso_directory_record *de;
1226         struct iso_directory_record *tmpde = NULL;
1227         unsigned int de_len;
1228         unsigned long offset;
1229         struct iso_inode_info *ei = ISOFS_I(inode);
1230         int ret = -EIO;
1231
1232         block = ei->i_iget5_block;
1233         bh = sb_bread(inode->i_sb, block);
1234         if (!bh)
1235                 goto out_badread;
1236
1237         offset = ei->i_iget5_offset;
1238
1239         de = (struct iso_directory_record *) (bh->b_data + offset);
1240         de_len = *(unsigned char *) de;
1241
1242         if (offset + de_len > bufsize) {
1243                 int frag1 = bufsize - offset;
1244
1245                 tmpde = kmalloc(de_len, GFP_KERNEL);
1246                 if (tmpde == NULL) {
1247                         printk(KERN_INFO "%s: out of memory\n", __func__);
1248                         ret = -ENOMEM;
1249                         goto fail;
1250                 }
1251                 memcpy(tmpde, bh->b_data + offset, frag1);
1252                 brelse(bh);
1253                 bh = sb_bread(inode->i_sb, ++block);
1254                 if (!bh)
1255                         goto out_badread;
1256                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1257                 de = tmpde;
1258         }
1259
1260         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1261                                         ei->i_iget5_offset,
1262                                         ISOFS_BUFFER_BITS(inode));
1263
1264         /* Assume it is a normal-format file unless told otherwise */
1265         ei->i_file_format = isofs_file_normal;
1266
1267         if (de->flags[-high_sierra] & 2) {
1268                 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1269                         inode->i_mode = S_IFDIR | sbi->s_dmode;
1270                 else
1271                         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1272                 inode->i_nlink = 1;     /*
1273                                          * Set to 1.  We know there are 2, but
1274                                          * the find utility tries to optimize
1275                                          * if it is 2, and it screws up.  It is
1276                                          * easier to give 1 which tells find to
1277                                          * do it the hard way.
1278                                          */
1279         } else {
1280                 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1281                         inode->i_mode = S_IFREG | sbi->s_fmode;
1282                 } else {
1283                         /*
1284                          * Set default permissions: r-x for all.  The disc
1285                          * could be shared with DOS machines so virtually
1286                          * anything could be a valid executable.
1287                          */
1288                         inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1289                 }
1290                 inode->i_nlink = 1;
1291         }
1292         inode->i_uid = sbi->s_uid;
1293         inode->i_gid = sbi->s_gid;
1294         inode->i_blocks = 0;
1295
1296         ei->i_format_parm[0] = 0;
1297         ei->i_format_parm[1] = 0;
1298         ei->i_format_parm[2] = 0;
1299
1300         ei->i_section_size = isonum_733(de->size);
1301         if (de->flags[-high_sierra] & 0x80) {
1302                 ret = isofs_read_level3_size(inode);
1303                 if (ret < 0)
1304                         goto fail;
1305                 ret = -EIO;
1306         } else {
1307                 ei->i_next_section_block = 0;
1308                 ei->i_next_section_offset = 0;
1309                 inode->i_size = isonum_733(de->size);
1310         }
1311
1312         /*
1313          * Some dipshit decided to store some other bit of information
1314          * in the high byte of the file length.  Truncate size in case
1315          * this CDROM was mounted with the cruft option.
1316          */
1317
1318         if (sbi->s_cruft)
1319                 inode->i_size &= 0x00ffffff;
1320
1321         if (de->interleave[0]) {
1322                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1323                 inode->i_size = 0;
1324         }
1325
1326         /* I have no idea what file_unit_size is used for, so
1327            we will flag it for now */
1328         if (de->file_unit_size[0] != 0) {
1329                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1330                         inode->i_ino);
1331         }
1332
1333         /* I have no idea what other flag bits are used for, so
1334            we will flag it for now */
1335 #ifdef DEBUG
1336         if((de->flags[-high_sierra] & ~2)!= 0){
1337                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1338                                 "(%ld %x).\n",
1339                         inode->i_ino, de->flags[-high_sierra]);
1340         }
1341 #endif
1342
1343         inode->i_mtime.tv_sec =
1344         inode->i_atime.tv_sec =
1345         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1346         inode->i_mtime.tv_nsec =
1347         inode->i_atime.tv_nsec =
1348         inode->i_ctime.tv_nsec = 0;
1349
1350         ei->i_first_extent = (isonum_733(de->extent) +
1351                         isonum_711(de->ext_attr_length));
1352
1353         /* Set the number of blocks for stat() - should be done before RR */
1354         inode->i_blocks = (inode->i_size + 511) >> 9;
1355
1356         /*
1357          * Now test for possible Rock Ridge extensions which will override
1358          * some of these numbers in the inode structure.
1359          */
1360
1361         if (!high_sierra) {
1362                 parse_rock_ridge_inode(de, inode);
1363                 /* if we want uid/gid set, override the rock ridge setting */
1364                 if (sbi->s_uid_set)
1365                         inode->i_uid = sbi->s_uid;
1366                 if (sbi->s_gid_set)
1367                         inode->i_gid = sbi->s_gid;
1368         }
1369         /* Now set final access rights if overriding rock ridge setting */
1370         if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1371             sbi->s_dmode != ISOFS_INVALID_MODE)
1372                 inode->i_mode = S_IFDIR | sbi->s_dmode;
1373         if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1374             sbi->s_fmode != ISOFS_INVALID_MODE)
1375                 inode->i_mode = S_IFREG | sbi->s_fmode;
1376
1377         /* Install the inode operations vector */
1378         if (S_ISREG(inode->i_mode)) {
1379                 inode->i_fop = &generic_ro_fops;
1380                 switch (ei->i_file_format) {
1381 #ifdef CONFIG_ZISOFS
1382                 case isofs_file_compressed:
1383                         inode->i_data.a_ops = &zisofs_aops;
1384                         break;
1385 #endif
1386                 default:
1387                         inode->i_data.a_ops = &isofs_aops;
1388                         break;
1389                 }
1390         } else if (S_ISDIR(inode->i_mode)) {
1391                 inode->i_op = &isofs_dir_inode_operations;
1392                 inode->i_fop = &isofs_dir_operations;
1393         } else if (S_ISLNK(inode->i_mode)) {
1394                 inode->i_op = &page_symlink_inode_operations;
1395                 inode->i_data.a_ops = &isofs_symlink_aops;
1396         } else
1397                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1398                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1399
1400         ret = 0;
1401 out:
1402         kfree(tmpde);
1403         if (bh)
1404                 brelse(bh);
1405         return ret;
1406
1407 out_badread:
1408         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1409 fail:
1410         goto out;
1411 }
1412
1413 struct isofs_iget5_callback_data {
1414         unsigned long block;
1415         unsigned long offset;
1416 };
1417
1418 static int isofs_iget5_test(struct inode *ino, void *data)
1419 {
1420         struct iso_inode_info *i = ISOFS_I(ino);
1421         struct isofs_iget5_callback_data *d =
1422                 (struct isofs_iget5_callback_data*)data;
1423         return (i->i_iget5_block == d->block)
1424                 && (i->i_iget5_offset == d->offset);
1425 }
1426
1427 static int isofs_iget5_set(struct inode *ino, void *data)
1428 {
1429         struct iso_inode_info *i = ISOFS_I(ino);
1430         struct isofs_iget5_callback_data *d =
1431                 (struct isofs_iget5_callback_data*)data;
1432         i->i_iget5_block = d->block;
1433         i->i_iget5_offset = d->offset;
1434         return 0;
1435 }
1436
1437 /* Store, in the inode's containing structure, the block and block
1438  * offset that point to the underlying meta-data for the inode.  The
1439  * code below is otherwise similar to the iget() code in
1440  * include/linux/fs.h */
1441 struct inode *isofs_iget(struct super_block *sb,
1442                          unsigned long block,
1443                          unsigned long offset)
1444 {
1445         unsigned long hashval;
1446         struct inode *inode;
1447         struct isofs_iget5_callback_data data;
1448         long ret;
1449
1450         if (offset >= 1ul << sb->s_blocksize_bits)
1451                 return ERR_PTR(-EINVAL);
1452
1453         data.block = block;
1454         data.offset = offset;
1455
1456         hashval = (block << sb->s_blocksize_bits) | offset;
1457
1458         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1459                                 &isofs_iget5_set, &data);
1460
1461         if (!inode)
1462                 return ERR_PTR(-ENOMEM);
1463
1464         if (inode->i_state & I_NEW) {
1465                 ret = isofs_read_inode(inode);
1466                 if (ret < 0) {
1467                         iget_failed(inode);
1468                         inode = ERR_PTR(ret);
1469                 } else {
1470                         unlock_new_inode(inode);
1471                 }
1472         }
1473
1474         return inode;
1475 }
1476
1477 static int isofs_get_sb(struct file_system_type *fs_type,
1478         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1479 {
1480         return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1481                                 mnt);
1482 }
1483
1484 static struct file_system_type iso9660_fs_type = {
1485         .owner          = THIS_MODULE,
1486         .name           = "iso9660",
1487         .get_sb         = isofs_get_sb,
1488         .kill_sb        = kill_block_super,
1489         .fs_flags       = FS_REQUIRES_DEV,
1490 };
1491
1492 static int __init init_iso9660_fs(void)
1493 {
1494         int err = init_inodecache();
1495         if (err)
1496                 goto out;
1497 #ifdef CONFIG_ZISOFS
1498         err = zisofs_init();
1499         if (err)
1500                 goto out1;
1501 #endif
1502         err = register_filesystem(&iso9660_fs_type);
1503         if (err)
1504                 goto out2;
1505         return 0;
1506 out2:
1507 #ifdef CONFIG_ZISOFS
1508         zisofs_cleanup();
1509 out1:
1510 #endif
1511         destroy_inodecache();
1512 out:
1513         return err;
1514 }
1515
1516 static void __exit exit_iso9660_fs(void)
1517 {
1518         unregister_filesystem(&iso9660_fs_type);
1519 #ifdef CONFIG_ZISOFS
1520         zisofs_cleanup();
1521 #endif
1522         destroy_inodecache();
1523 }
1524
1525 module_init(init_iso9660_fs)
1526 module_exit(exit_iso9660_fs)
1527 MODULE_LICENSE("GPL");
1528 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1529 MODULE_ALIAS("iso9660");