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         unload_nls(sbi->s_nls_iocharset);
  50
  51         unlock_kernel();
  52 #endif
  53
  54         kfree(sbi);
  55         sb->s_fs_info = NULL;
  56         return;
  57 }
  58
  59 static int isofs_read_inode(struct inode *);
  60 static int isofs_statfs (struct dentry *, struct kstatfs *);
  61
  62 static struct kmem_cache *isofs_inode_cachep;
  63
  64 static struct inode *isofs_alloc_inode(struct super_block *sb)
  65 {
  66         struct iso_inode_info *ei;
  67         ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
  68         if (!ei)
  69                 return NULL;
  70         return &ei->vfs_inode;
  71 }
  72
  73 static void isofs_destroy_inode(struct inode *inode)
  74 {
  75         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
  76 }
  77
  78 static void init_once(void *foo)
  79 {
  80         struct iso_inode_info *ei = foo;
  81
  82         inode_init_once(&ei->vfs_inode);
  83 }
  84
  85 static int init_inodecache(void)
  86 {
  87         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
  88                                         sizeof(struct iso_inode_info),
  89                                         0, (SLAB_RECLAIM_ACCOUNT|
  90                                         SLAB_MEM_SPREAD),
  91                                         init_once);
  92         if (isofs_inode_cachep == NULL)
  93                 return -ENOMEM;
  94         return 0;
  95 }
  96
  97 static void destroy_inodecache(void)
  98 {
  99         kmem_cache_destroy(isofs_inode_cachep);
 100 }
 101
 102 static int isofs_remount(struct super_block *sb, int *flags, char *data)
 103 {
 104         /* we probably want a lot more here */
 105         *flags |= MS_RDONLY;
 106         return 0;
 107 }
 108
 109 static const struct super_operations isofs_sops = {
 110         .alloc_inode    = isofs_alloc_inode,
 111         .destroy_inode  = isofs_destroy_inode,
 112         .put_super      = isofs_put_super,
 113         .statfs         = isofs_statfs,
 114         .remount_fs     = isofs_remount,
 115         .show_options   = generic_show_options,
 116 };
 117
 118
 119 static const struct dentry_operations isofs_dentry_ops[] = {
 120         {
 121                 .d_hash         = isofs_hash,
 122                 .d_compare      = isofs_dentry_cmp,
 123         },
 124         {
 125                 .d_hash         = isofs_hashi,
 126                 .d_compare      = isofs_dentry_cmpi,
 127         },
 128 #ifdef CONFIG_JOLIET
 129         {
 130                 .d_hash         = isofs_hash_ms,
 131                 .d_compare      = isofs_dentry_cmp_ms,
 132         },
 133         {
 134                 .d_hash         = isofs_hashi_ms,
 135                 .d_compare      = isofs_dentry_cmpi_ms,
 136         },
 137 #endif
 138 };
 139
 140 struct iso9660_options{
 141         unsigned int rock:1;
 142         unsigned int joliet:1;
 143         unsigned int cruft:1;
 144         unsigned int hide:1;
 145         unsigned int showassoc:1;
 146         unsigned int nocompress:1;
 147         unsigned int overriderockperm:1;
 148         unsigned int uid_set:1;
 149         unsigned int gid_set:1;
 150         unsigned int utf8:1;
 151         unsigned char map;
 152         unsigned char check;
 153         unsigned int blocksize;
 154         mode_t fmode;
 155         mode_t dmode;
 156         gid_t gid;
 157         uid_t uid;
 158         char *iocharset;
 159         /* LVE */
 160         s32 session;
 161         s32 sbsector;
 162 };
 163
 164 /*
 165  * Compute the hash for the isofs name corresponding to the dentry.
 166  */
 167 static int
 168 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
 169 {
 170         const char *name;
 171         int len;
 172
 173         len = qstr->len;
 174         name = qstr->name;
 175         if (ms) {
 176                 while (len && name[len-1] == '.')
 177                         len--;
 178         }
 179
 180         qstr->hash = full_name_hash(name, len);
 181
 182         return 0;
 183 }
 184
 185 /*
 186  * Compute the hash for the isofs name corresponding to the dentry.
 187  */
 188 static int
 189 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
 190 {
 191         const char *name;
 192         int len;
 193         char c;
 194         unsigned long hash;
 195
 196         len = qstr->len;
 197         name = qstr->name;
 198         if (ms) {
 199                 while (len && name[len-1] == '.')
 200                         len--;
 201         }
 202
 203         hash = init_name_hash();
 204         while (len--) {
 205                 c = tolower(*name++);
 206                 hash = partial_name_hash(c, hash);
 207         }
 208         qstr->hash = end_name_hash(hash);
 209
 210         return 0;
 211 }
 212
 213 /*
 214  * Case insensitive compare of two isofs names.
 215  */
 216 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
 217                                 struct qstr *b, int ms)
 218 {
 219         int alen, blen;
 220
 221         /* A filename cannot end in '.' or we treat it like it has none */
 222         alen = a->len;
 223         blen = b->len;
 224         if (ms) {
 225                 while (alen && a->name[alen-1] == '.')
 226                         alen--;
 227                 while (blen && b->name[blen-1] == '.')
 228                         blen--;
 229         }
 230         if (alen == blen) {
 231                 if (strnicmp(a->name, b->name, alen) == 0)
 232                         return 0;
 233         }
 234         return 1;
 235 }
 236
 237 /*
 238  * Case sensitive compare of two isofs names.
 239  */
 240 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
 241                                         struct qstr *b, int ms)
 242 {
 243         int alen, blen;
 244
 245         /* A filename cannot end in '.' or we treat it like it has none */
 246         alen = a->len;
 247         blen = b->len;
 248         if (ms) {
 249                 while (alen && a->name[alen-1] == '.')
 250                         alen--;
 251                 while (blen && b->name[blen-1] == '.')
 252                         blen--;
 253         }
 254         if (alen == blen) {
 255                 if (strncmp(a->name, b->name, alen) == 0)
 256                         return 0;
 257         }
 258         return 1;
 259 }
 260
 261 static int
 262 isofs_hash(struct dentry *dentry, struct qstr *qstr)
 263 {
 264         return isofs_hash_common(dentry, qstr, 0);
 265 }
 266
 267 static int
 268 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
 269 {
 270         return isofs_hashi_common(dentry, qstr, 0);
 271 }
 272
 273 static int
 274 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
 275 {
 276         return isofs_dentry_cmp_common(dentry, a, b, 0);
 277 }
 278
 279 static int
 280 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
 281 {
 282         return isofs_dentry_cmpi_common(dentry, a, b, 0);
 283 }
 284
 285 #ifdef CONFIG_JOLIET
 286 static int
 287 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
 288 {
 289         return isofs_hash_common(dentry, qstr, 1);
 290 }
 291
 292 static int
 293 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
 294 {
 295         return isofs_hashi_common(dentry, qstr, 1);
 296 }
 297
 298 static int
 299 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
 300 {
 301         return isofs_dentry_cmp_common(dentry, a, b, 1);
 302 }
 303
 304 static int
 305 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
 306 {
 307         return isofs_dentry_cmpi_common(dentry, a, b, 1);
 308 }
 309 #endif
 310
 311 enum {
 312         Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
 313         Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
 314         Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
 315         Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
 316 };
 317
 318 static const match_table_t tokens = {
 319         {Opt_norock, "norock"},
 320         {Opt_nojoliet, "nojoliet"},
 321         {Opt_unhide, "unhide"},
 322         {Opt_hide, "hide"},
 323         {Opt_showassoc, "showassoc"},
 324         {Opt_cruft, "cruft"},
 325         {Opt_utf8, "utf8"},
 326         {Opt_iocharset, "iocharset=%s"},
 327         {Opt_map_a, "map=acorn"},
 328         {Opt_map_a, "map=a"},
 329         {Opt_map_n, "map=normal"},
 330         {Opt_map_n, "map=n"},
 331         {Opt_map_o, "map=off"},
 332         {Opt_map_o, "map=o"},
 333         {Opt_session, "session=%u"},
 334         {Opt_sb, "sbsector=%u"},
 335         {Opt_check_r, "check=relaxed"},
 336         {Opt_check_r, "check=r"},
 337         {Opt_check_s, "check=strict"},
 338         {Opt_check_s, "check=s"},
 339         {Opt_uid, "uid=%u"},
 340         {Opt_gid, "gid=%u"},
 341         {Opt_mode, "mode=%u"},
 342         {Opt_dmode, "dmode=%u"},
 343         {Opt_overriderockperm, "overriderockperm"},
 344         {Opt_block, "block=%u"},
 345         {Opt_ignore, "conv=binary"},
 346         {Opt_ignore, "conv=b"},
 347         {Opt_ignore, "conv=text"},
 348         {Opt_ignore, "conv=t"},
 349         {Opt_ignore, "conv=mtext"},
 350         {Opt_ignore, "conv=m"},
 351         {Opt_ignore, "conv=auto"},
 352         {Opt_ignore, "conv=a"},
 353         {Opt_nocompress, "nocompress"},
 354         {Opt_err, NULL}
 355 };
 356
 357 static int parse_options(char *options, struct iso9660_options *popt)
 358 {
 359         char *p;
 360         int option;
 361
 362         popt->map = 'n';
 363         popt->rock = 1;
 364         popt->joliet = 1;
 365         popt->cruft = 0;
 366         popt->hide = 0;
 367         popt->showassoc = 0;
 368         popt->check = 'u';              /* unset */
 369         popt->nocompress = 0;
 370         popt->blocksize = 1024;
 371         popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
 372         popt->uid_set = 0;
 373         popt->gid_set = 0;
 374         popt->gid = 0;
 375         popt->uid = 0;
 376         popt->iocharset = NULL;
 377         popt->utf8 = 0;
 378         popt->overriderockperm = 0;
 379         popt->session=-1;
 380         popt->sbsector=-1;
 381         if (!options)
 382                 return 1;
 383
 384         while ((p = strsep(&options, ",")) != NULL) {
 385                 int token;
 386                 substring_t args[MAX_OPT_ARGS];
 387                 unsigned n;
 388
 389                 if (!*p)
 390                         continue;
 391
 392                 token = match_token(p, tokens, args);
 393                 switch (token) {
 394                 case Opt_norock:
 395                         popt->rock = 0;
 396                         break;
 397                 case Opt_nojoliet:
 398                         popt->joliet = 0;
 399                         break;
 400                 case Opt_hide:
 401                         popt->hide = 1;
 402                         break;
 403                 case Opt_unhide:
 404                 case Opt_showassoc:
 405                         popt->showassoc = 1;
 406                         break;
 407                 case Opt_cruft:
 408                         popt->cruft = 1;
 409                         break;
 410                 case Opt_utf8:
 411                         popt->utf8 = 1;
 412                         break;
 413 #ifdef CONFIG_JOLIET
 414                 case Opt_iocharset:
 415                         popt->iocharset = match_strdup(&args[0]);
 416                         break;
 417 #endif
 418                 case Opt_map_a:
 419                         popt->map = 'a';
 420                         break;
 421                 case Opt_map_o:
 422                         popt->map = 'o';
 423                         break;
 424                 case Opt_map_n:
 425                         popt->map = 'n';
 426                         break;
 427                 case Opt_session:
 428                         if (match_int(&args[0], &option))
 429                                 return 0;
 430                         n = option;
 431                         if (n > 99)
 432                                 return 0;
 433                         popt->session = n + 1;
 434                         break;
 435                 case Opt_sb:
 436                         if (match_int(&args[0], &option))
 437                                 return 0;
 438                         popt->sbsector = option;
 439                         break;
 440                 case Opt_check_r:
 441                         popt->check = 'r';
 442                         break;
 443                 case Opt_check_s:
 444                         popt->check = 's';
 445                         break;
 446                 case Opt_ignore:
 447                         break;
 448                 case Opt_uid:
 449                         if (match_int(&args[0], &option))
 450                                 return 0;
 451                         popt->uid = option;
 452                         popt->uid_set = 1;
 453                         break;
 454                 case Opt_gid:
 455                         if (match_int(&args[0], &option))
 456                                 return 0;
 457                         popt->gid = option;
 458                         popt->gid_set = 1;
 459                         break;
 460                 case Opt_mode:
 461                         if (match_int(&args[0], &option))
 462                                 return 0;
 463                         popt->fmode = option;
 464                         break;
 465                 case Opt_dmode:
 466                         if (match_int(&args[0], &option))
 467                                 return 0;
 468                         popt->dmode = option;
 469                         break;
 470                 case Opt_overriderockperm:
 471                         popt->overriderockperm = 1;
 472                         break;
 473                 case Opt_block:
 474                         if (match_int(&args[0], &option))
 475                                 return 0;
 476                         n = option;
 477                         if (n != 512 && n != 1024 && n != 2048)
 478                                 return 0;
 479                         popt->blocksize = n;
 480                         break;
 481                 case Opt_nocompress:
 482                         popt->nocompress = 1;
 483                         break;
 484                 default:
 485                         return 0;
 486                 }
 487         }
 488         return 1;
 489 }
 490
 491 /*
 492  * look if the driver can tell the multi session redirection value
 493  *
 494  * don't change this if you don't know what you do, please!
 495  * Multisession is legal only with XA disks.
 496  * A non-XA disk with more than one volume descriptor may do it right, but
 497  * usually is written in a nowhere standardized "multi-partition" manner.
 498  * Multisession uses absolute addressing (solely the first frame of the whole
 499  * track is #0), multi-partition uses relative addressing (each first frame of
 500  * each track is #0), and a track is not a session.
 501  *
 502  * A broken CDwriter software or drive firmware does not set new standards,
 503  * at least not if conflicting with the existing ones.
 504  *
 505  * emoenke@gwdg.de
 506  */
 507 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
 508
 509 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
 510 {
 511         struct cdrom_multisession ms_info;
 512         unsigned int vol_desc_start;
 513         struct block_device *bdev = sb->s_bdev;
 514         int i;
 515
 516         vol_desc_start=0;
 517         ms_info.addr_format=CDROM_LBA;
 518         if(session >= 0 && session <= 99) {
 519                 struct cdrom_tocentry Te;
 520                 Te.cdte_track=session;
 521                 Te.cdte_format=CDROM_LBA;
 522                 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
 523                 if (!i) {
 524                         printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
 525                                 session, Te.cdte_addr.lba,
 526                                 Te.cdte_ctrl&CDROM_DATA_TRACK);
 527                         if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
 528                                 return Te.cdte_addr.lba;
 529                 }
 530
 531                 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
 532         }
 533         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
 534         if (session > 0)
 535                 printk(KERN_ERR "ISOFS: Invalid session number\n");
 536 #if 0
 537         printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
 538         if (i==0) {
 539                 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
 540                 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
 541         }
 542 #endif
 543         if (i==0)
 544 #if WE_OBEY_THE_WRITTEN_STANDARDS
 545                 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
 546 #endif
 547                         vol_desc_start=ms_info.addr.lba;
 548         return vol_desc_start;
 549 }
 550
 551 /*
 552  * Initialize the superblock and read the root inode.
 553  *
 554  * Note: a check_disk_change() has been done immediately prior
 555  * to this call, so we don't need to check again.
 556  */
 557 static int isofs_fill_super(struct super_block *s, void *data, int silent)
 558 {
 559         struct buffer_head *bh = NULL, *pri_bh = NULL;
 560         struct hs_primary_descriptor *h_pri = NULL;
 561         struct iso_primary_descriptor *pri = NULL;
 562         struct iso_supplementary_descriptor *sec = NULL;
 563         struct iso_directory_record *rootp;
 564         struct inode *inode;
 565         struct iso9660_options opt;
 566         struct isofs_sb_info *sbi;
 567         unsigned long first_data_zone;
 568         int joliet_level = 0;
 569         int iso_blknum, block;
 570         int orig_zonesize;
 571         int table, error = -EINVAL;
 572         unsigned int vol_desc_start;
 573
 574         save_mount_options(s, data);
 575
 576         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 577         if (!sbi)
 578                 return -ENOMEM;
 579         s->s_fs_info = sbi;
 580
 581         if (!parse_options((char *)data, &opt))
 582                 goto out_freesbi;
 583
 584         /*
 585          * First of all, get the hardware blocksize for this device.
 586          * If we don't know what it is, or the hardware blocksize is
 587          * larger than the blocksize the user specified, then use
 588          * that value.
 589          */
 590         /*
 591          * What if bugger tells us to go beyond page size?
 592          */
 593         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
 594
 595         sbi->s_high_sierra = 0; /* default is iso9660 */
 596
 597         vol_desc_start = (opt.sbsector != -1) ?
 598                 opt.sbsector : isofs_get_last_session(s,opt.session);
 599
 600         for (iso_blknum = vol_desc_start+16;
 601                 iso_blknum < vol_desc_start+100; iso_blknum++) {
 602                 struct hs_volume_descriptor *hdp;
 603                 struct iso_volume_descriptor  *vdp;
 604
 605                 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
 606                 if (!(bh = sb_bread(s, block)))
 607                         goto out_no_read;
 608
 609                 vdp = (struct iso_volume_descriptor *)bh->b_data;
 610                 hdp = (struct hs_volume_descriptor *)bh->b_data;
 611
 612                 /*
 613                  * Due to the overlapping physical location of the descriptors,
 614                  * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
 615                  * proper identification in this case, we first check for ISO.
 616                  */
 617                 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
 618                         if (isonum_711(vdp->type) == ISO_VD_END)
 619                                 break;
 620                         if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
 621                                 if (pri == NULL) {
 622                                         pri = (struct iso_primary_descriptor *)vdp;
 623                                         /* Save the buffer in case we need it ... */
 624                                         pri_bh = bh;
 625                                         bh = NULL;
 626                                 }
 627                         }
 628 #ifdef CONFIG_JOLIET
 629                         else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
 630                                 sec = (struct iso_supplementary_descriptor *)vdp;
 631                                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
 632                                         if (opt.joliet) {
 633                                                 if (sec->escape[2] == 0x40)
 634                                                         joliet_level = 1;
 635                                                 else if (sec->escape[2] == 0x43)
 636                                                         joliet_level = 2;
 637                                                 else if (sec->escape[2] == 0x45)
 638                                                         joliet_level = 3;
 639
 640                                                 printk(KERN_DEBUG "ISO 9660 Extensions: "
 641                                                         "Microsoft Joliet Level %d\n",
 642                                                         joliet_level);
 643                                         }
 644                                         goto root_found;
 645                                 } else {
 646                                 /* Unknown supplementary volume descriptor */
 647                                 sec = NULL;
 648                                 }
 649                         }
 650 #endif
 651                 } else {
 652                         if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
 653                                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
 654                                         goto out_freebh;
 655
 656                                 sbi->s_high_sierra = 1;
 657                                 opt.rock = 0;
 658                                 h_pri = (struct hs_primary_descriptor *)vdp;
 659                                 goto root_found;
 660                         }
 661                 }
 662
 663                 /* Just skip any volume descriptors we don't recognize */
 664
 665                 brelse(bh);
 666                 bh = NULL;
 667         }
 668         /*
 669          * If we fall through, either no volume descriptor was found,
 670          * or else we passed a primary descriptor looking for others.
 671          */
 672         if (!pri)
 673                 goto out_unknown_format;
 674         brelse(bh);
 675         bh = pri_bh;
 676         pri_bh = NULL;
 677
 678 root_found:
 679
 680         if (joliet_level && (pri == NULL || !opt.rock)) {
 681                 /* This is the case of Joliet with the norock mount flag.
 682                  * A disc with both Joliet and Rock Ridge is handled later
 683                  */
 684                 pri = (struct iso_primary_descriptor *) sec;
 685         }
 686
 687         if(sbi->s_high_sierra){
 688                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
 689                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
 690                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
 691                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
 692         } else {
 693                 if (!pri)
 694                         goto out_freebh;
 695                 rootp = (struct iso_directory_record *) pri->root_directory_record;
 696                 sbi->s_nzones = isonum_733(pri->volume_space_size);
 697                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
 698                 sbi->s_max_size = isonum_733(pri->volume_space_size);
 699         }
 700
 701         sbi->s_ninodes = 0; /* No way to figure this out easily */
 702
 703         orig_zonesize = sbi->s_log_zone_size;
 704         /*
 705          * If the zone size is smaller than the hardware sector size,
 706          * this is a fatal error.  This would occur if the disc drive
 707          * had sectors that were 2048 bytes, but the filesystem had
 708          * blocks that were 512 bytes (which should only very rarely
 709          * happen.)
 710          */
 711         if (orig_zonesize < opt.blocksize)
 712                 goto out_bad_size;
 713
 714         /* RDE: convert log zone size to bit shift */
 715         switch (sbi->s_log_zone_size) {
 716         case  512: sbi->s_log_zone_size =  9; break;
 717         case 1024: sbi->s_log_zone_size = 10; break;
 718         case 2048: sbi->s_log_zone_size = 11; break;
 719
 720         default:
 721                 goto out_bad_zone_size;
 722         }
 723
 724         s->s_magic = ISOFS_SUPER_MAGIC;
 725
 726         /*
 727          * With multi-extent files, file size is only limited by the maximum
 728          * size of a file system, which is 8 TB.
 729          */
 730         s->s_maxbytes = 0x80000000000LL;
 731
 732         /*
 733          * The CDROM is read-only, has no nodes (devices) on it, and since
 734          * all of the files appear to be owned by root, we really do not want
 735          * to allow suid.  (suid or devices will not show up unless we have
 736          * Rock Ridge extensions)
 737          */
 738
 739         s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
 740
 741         /* Set this for reference. Its not currently used except on write
 742            which we don't have .. */
 743
 744         first_data_zone = isonum_733(rootp->extent) +
 745                           isonum_711(rootp->ext_attr_length);
 746         sbi->s_firstdatazone = first_data_zone;
 747 #ifndef BEQUIET
 748         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
 749                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
 750         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
 751         if(sbi->s_high_sierra)
 752                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
 753 #endif
 754
 755         /*
 756          * If the Joliet level is set, we _may_ decide to use the
 757          * secondary descriptor, but can't be sure until after we
 758          * read the root inode. But before reading the root inode
 759          * we may need to change the device blocksize, and would
 760          * rather release the old buffer first. So, we cache the
 761          * first_data_zone value from the secondary descriptor.
 762          */
 763         if (joliet_level) {
 764                 pri = (struct iso_primary_descriptor *) sec;
 765                 rootp = (struct iso_directory_record *)
 766                         pri->root_directory_record;
 767                 first_data_zone = isonum_733(rootp->extent) +
 768                                 isonum_711(rootp->ext_attr_length);
 769         }
 770
 771         /*
 772          * We're all done using the volume descriptor, and may need
 773          * to change the device blocksize, so release the buffer now.
 774          */
 775         brelse(pri_bh);
 776         brelse(bh);
 777
 778         /*
 779          * Force the blocksize to 512 for 512 byte sectors.  The file
 780          * read primitives really get it wrong in a bad way if we don't
 781          * do this.
 782          *
 783          * Note - we should never be setting the blocksize to something
 784          * less than the hardware sector size for the device.  If we
 785          * do, we would end up having to read larger buffers and split
 786          * out portions to satisfy requests.
 787          *
 788          * Note2- the idea here is that we want to deal with the optimal
 789          * zonesize in the filesystem.  If we have it set to something less,
 790          * then we have horrible problems with trying to piece together
 791          * bits of adjacent blocks in order to properly read directory
 792          * entries.  By forcing the blocksize in this way, we ensure
 793          * that we will never be required to do this.
 794          */
 795         sb_set_blocksize(s, orig_zonesize);
 796
 797         sbi->s_nls_iocharset = NULL;
 798
 799 #ifdef CONFIG_JOLIET
 800         if (joliet_level && opt.utf8 == 0) {
 801                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
 802                 sbi->s_nls_iocharset = load_nls(p);
 803                 if (! sbi->s_nls_iocharset) {
 804                         /* Fail only if explicit charset specified */
 805                         if (opt.iocharset)
 806                                 goto out_freesbi;
 807                         sbi->s_nls_iocharset = load_nls_default();
 808                 }
 809         }
 810 #endif
 811         s->s_op = &isofs_sops;
 812         s->s_export_op = &isofs_export_ops;
 813         sbi->s_mapping = opt.map;
 814         sbi->s_rock = (opt.rock ? 2 : 0);
 815         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
 816         sbi->s_cruft = opt.cruft;
 817         sbi->s_hide = opt.hide;
 818         sbi->s_showassoc = opt.showassoc;
 819         sbi->s_uid = opt.uid;
 820         sbi->s_gid = opt.gid;
 821         sbi->s_uid_set = opt.uid_set;
 822         sbi->s_gid_set = opt.gid_set;
 823         sbi->s_utf8 = opt.utf8;
 824         sbi->s_nocompress = opt.nocompress;
 825         sbi->s_overriderockperm = opt.overriderockperm;
 826         /*
 827          * It would be incredibly stupid to allow people to mark every file
 828          * on the disk as suid, so we merely allow them to set the default
 829          * permissions.
 830          */
 831         if (opt.fmode != ISOFS_INVALID_MODE)
 832                 sbi->s_fmode = opt.fmode & 0777;
 833         else
 834                 sbi->s_fmode = ISOFS_INVALID_MODE;
 835         if (opt.dmode != ISOFS_INVALID_MODE)
 836                 sbi->s_dmode = opt.dmode & 0777;
 837         else
 838                 sbi->s_dmode = ISOFS_INVALID_MODE;
 839
 840         /*
 841          * Read the root inode, which _may_ result in changing
 842          * the s_rock flag. Once we have the final s_rock value,
 843          * we then decide whether to use the Joliet descriptor.
 844          */
 845         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 846         if (IS_ERR(inode))
 847                 goto out_no_root;
 848
 849         /*
 850          * If this disk has both Rock Ridge and Joliet on it, then we
 851          * want to use Rock Ridge by default.  This can be overridden
 852          * by using the norock mount option.  There is still one other
 853          * possibility that is not taken into account: a Rock Ridge
 854          * CD with Unicode names.  Until someone sees such a beast, it
 855          * will not be supported.
 856          */
 857         if (sbi->s_rock == 1) {
 858                 joliet_level = 0;
 859         } else if (joliet_level) {
 860                 sbi->s_rock = 0;
 861                 if (sbi->s_firstdatazone != first_data_zone) {
 862                         sbi->s_firstdatazone = first_data_zone;
 863                         printk(KERN_DEBUG
 864                                 "ISOFS: changing to secondary root\n");
 865                         iput(inode);
 866                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 867                         if (IS_ERR(inode))
 868                                 goto out_no_root;
 869                 }
 870         }
 871
 872         if (opt.check == 'u') {
 873                 /* Only Joliet is case insensitive by default */
 874                 if (joliet_level)
 875                         opt.check = 'r';
 876                 else
 877                         opt.check = 's';
 878         }
 879         sbi->s_joliet_level = joliet_level;
 880
 881         /* Make sure the root inode is a directory */
 882         if (!S_ISDIR(inode->i_mode)) {
 883                 printk(KERN_WARNING
 884                         "isofs_fill_super: root inode is not a directory. "
 885                         "Corrupted media?\n");
 886                 goto out_iput;
 887         }
 888
 889         /* get the root dentry */
 890         s->s_root = d_alloc_root(inode);
 891         if (!(s->s_root))
 892                 goto out_no_root;
 893
 894         table = 0;
 895         if (joliet_level)
 896                 table += 2;
 897         if (opt.check == 'r')
 898                 table++;
 899         s->s_root->d_op = &isofs_dentry_ops[table];
 900
 901         kfree(opt.iocharset);
 902
 903         return 0;
 904
 905         /*
 906          * Display error messages and free resources.
 907          */
 908 out_iput:
 909         iput(inode);
 910         goto out_no_inode;
 911 out_no_root:
 912         error = PTR_ERR(inode);
 913         if (error != -ENOMEM)
 914                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
 915 out_no_inode:
 916 #ifdef CONFIG_JOLIET
 917         unload_nls(sbi->s_nls_iocharset);
 918 #endif
 919         goto out_freesbi;
 920 out_no_read:
 921         printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
 922                 __func__, s->s_id, iso_blknum, block);
 923         goto out_freesbi;
 924 out_bad_zone_size:
 925         printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
 926                 sbi->s_log_zone_size);
 927         goto out_freebh;
 928 out_bad_size:
 929         printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
 930                 orig_zonesize, opt.blocksize);
 931         goto out_freebh;
 932 out_unknown_format:
 933         if (!silent)
 934                 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
 935
 936 out_freebh:
 937         brelse(bh);
 938 out_freesbi:
 939         kfree(opt.iocharset);
 940         kfree(sbi);
 941         s->s_fs_info = NULL;
 942         return error;
 943 }
 944
 945 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
 946 {
 947         struct super_block *sb = dentry->d_sb;
 948         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 949
 950         buf->f_type = ISOFS_SUPER_MAGIC;
 951         buf->f_bsize = sb->s_blocksize;
 952         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
 953                 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
 954         buf->f_bfree = 0;
 955         buf->f_bavail = 0;
 956         buf->f_files = ISOFS_SB(sb)->s_ninodes;
 957         buf->f_ffree = 0;
 958         buf->f_fsid.val[0] = (u32)id;
 959         buf->f_fsid.val[1] = (u32)(id >> 32);
 960         buf->f_namelen = NAME_MAX;
 961         return 0;
 962 }
 963
 964 /*
 965  * Get a set of blocks; filling in buffer_heads if already allocated
 966  * or getblk() if they are not.  Returns the number of blocks inserted
 967  * (-ve == error.)
 968  */
 969 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
 970                      struct buffer_head **bh, unsigned long nblocks)
 971 {
 972         unsigned long b_off;
 973         unsigned offset, sect_size;
 974         unsigned int firstext;
 975         unsigned long nextblk, nextoff;
 976         long iblock = (long)iblock_s;
 977         int section, rv, error;
 978         struct iso_inode_info *ei = ISOFS_I(inode);
 979
 980         lock_kernel();
 981
 982         error = -EIO;
 983         rv = 0;
 984         if (iblock < 0 || iblock != iblock_s) {
 985                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
 986                 goto abort;
 987         }
 988
 989         b_off = iblock;
 990
 991         offset = 0;
 992         firstext = ei->i_first_extent;
 993         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
 994         nextblk = ei->i_next_section_block;
 995         nextoff = ei->i_next_section_offset;
 996         section = 0;
 997
 998         while (nblocks) {
 999                 /* If we are *way* beyond the end of the file, print a message.
1000                  * Access beyond the end of the file up to the next page boundary
1001                  * is normal, however because of the way the page cache works.
1002                  * In this case, we just return 0 so that we can properly fill
1003                  * the page with useless information without generating any
1004                  * I/O errors.
1005                  */
1006                 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1007                         printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
1008                                 __func__, iblock, (unsigned long) inode->i_size);
1009                         goto abort;
1010                 }
1011
1012                 /* On the last section, nextblk == 0, section size is likely to
1013                  * exceed sect_size by a partial block, and access beyond the
1014                  * end of the file will reach beyond the section size, too.
1015                  */
1016                 while (nextblk && (b_off >= (offset + sect_size))) {
1017                         struct inode *ninode;
1018
1019                         offset += sect_size;
1020                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1021                         if (IS_ERR(ninode)) {
1022                                 error = PTR_ERR(ninode);
1023                                 goto abort;
1024                         }
1025                         firstext  = ISOFS_I(ninode)->i_first_extent;
1026                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1027                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
1028                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1029                         iput(ninode);
1030
1031                         if (++section > 100) {
1032                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1033                                         " aborting...\n", __func__);
1034                                 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1035                                         "nextblk=%lu nextoff=%lu\n", __func__,
1036                                         iblock, firstext, (unsigned) sect_size,
1037                                         nextblk, nextoff);
1038                                 goto abort;
1039                         }
1040                 }
1041
1042                 if (*bh) {
1043                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1044                 } else {
1045                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1046                         if (!*bh)
1047                                 goto abort;
1048                 }
1049                 bh++;   /* Next buffer head */
1050                 b_off++;        /* Next buffer offset */
1051                 nblocks--;
1052                 rv++;
1053         }
1054
1055         error = 0;
1056 abort:
1057         unlock_kernel();
1058         return rv != 0 ? rv : error;
1059 }
1060
1061 /*
1062  * Used by the standard interfaces.
1063  */
1064 static int isofs_get_block(struct inode *inode, sector_t iblock,
1065                     struct buffer_head *bh_result, int create)
1066 {
1067         int ret;
1068
1069         if (create) {
1070                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1071                 return -EROFS;
1072         }
1073
1074         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1075         return ret < 0 ? ret : 0;
1076 }
1077
1078 static int isofs_bmap(struct inode *inode, sector_t block)
1079 {
1080         struct buffer_head dummy;
1081         int error;
1082
1083         dummy.b_state = 0;
1084         dummy.b_blocknr = -1000;
1085         error = isofs_get_block(inode, block, &dummy, 0);
1086         if (!error)
1087                 return dummy.b_blocknr;
1088         return 0;
1089 }
1090
1091 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1092 {
1093         sector_t blknr = isofs_bmap(inode, block);
1094         if (!blknr)
1095                 return NULL;
1096         return sb_bread(inode->i_sb, blknr);
1097 }
1098
1099 static int isofs_readpage(struct file *file, struct page *page)
1100 {
1101         return block_read_full_page(page,isofs_get_block);
1102 }
1103
1104 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1105 {
1106         return generic_block_bmap(mapping,block,isofs_get_block);
1107 }
1108
1109 static const struct address_space_operations isofs_aops = {
1110         .readpage = isofs_readpage,
1111         .sync_page = block_sync_page,
1112         .bmap = _isofs_bmap
1113 };
1114
1115 static int isofs_read_level3_size(struct inode *inode)
1116 {
1117         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1118         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1119         struct buffer_head *bh = NULL;
1120         unsigned long block, offset, block_saved, offset_saved;
1121         int i = 0;
1122         int more_entries = 0;
1123         struct iso_directory_record *tmpde = NULL;
1124         struct iso_inode_info *ei = ISOFS_I(inode);
1125
1126         inode->i_size = 0;
1127
1128         /* The first 16 blocks are reserved as the System Area.  Thus,
1129          * no inodes can appear in block 0.  We use this to flag that
1130          * this is the last section. */
1131         ei->i_next_section_block = 0;
1132         ei->i_next_section_offset = 0;
1133
1134         block = ei->i_iget5_block;
1135         offset = ei->i_iget5_offset;
1136
1137         do {
1138                 struct iso_directory_record *de;
1139                 unsigned int de_len;
1140
1141                 if (!bh) {
1142                         bh = sb_bread(inode->i_sb, block);
1143                         if (!bh)
1144                                 goto out_noread;
1145                 }
1146                 de = (struct iso_directory_record *) (bh->b_data + offset);
1147                 de_len = *(unsigned char *) de;
1148
1149                 if (de_len == 0) {
1150                         brelse(bh);
1151                         bh = NULL;
1152                         ++block;
1153                         offset = 0;
1154                         continue;
1155                 }
1156
1157                 block_saved = block;
1158                 offset_saved = offset;
1159                 offset += de_len;
1160
1161                 /* Make sure we have a full directory entry */
1162                 if (offset >= bufsize) {
1163                         int slop = bufsize - offset + de_len;
1164                         if (!tmpde) {
1165                                 tmpde = kmalloc(256, GFP_KERNEL);
1166                                 if (!tmpde)
1167                                         goto out_nomem;
1168                         }
1169                         memcpy(tmpde, de, slop);
1170                         offset &= bufsize - 1;
1171                         block++;
1172                         brelse(bh);
1173                         bh = NULL;
1174                         if (offset) {
1175                                 bh = sb_bread(inode->i_sb, block);
1176                                 if (!bh)
1177                                         goto out_noread;
1178                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1179                         }
1180                         de = tmpde;
1181                 }
1182
1183                 inode->i_size += isonum_733(de->size);
1184                 if (i == 1) {
1185                         ei->i_next_section_block = block_saved;
1186                         ei->i_next_section_offset = offset_saved;
1187                 }
1188
1189                 more_entries = de->flags[-high_sierra] & 0x80;
1190
1191                 i++;
1192                 if (i > 100)
1193                         goto out_toomany;
1194         } while (more_entries);
1195 out:
1196         kfree(tmpde);
1197         if (bh)
1198                 brelse(bh);
1199         return 0;
1200
1201 out_nomem:
1202         if (bh)
1203                 brelse(bh);
1204         return -ENOMEM;
1205
1206 out_noread:
1207         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1208         kfree(tmpde);
1209         return -EIO;
1210
1211 out_toomany:
1212         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1213                 "isofs_read_level3_size: inode=%lu\n",
1214                 __func__, inode->i_ino);
1215         goto out;
1216 }
1217
1218 static int isofs_read_inode(struct inode *inode)
1219 {
1220         struct super_block *sb = inode->i_sb;
1221         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1222         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1223         unsigned long block;
1224         int high_sierra = sbi->s_high_sierra;
1225         struct buffer_head *bh = NULL;
1226         struct iso_directory_record *de;
1227         struct iso_directory_record *tmpde = NULL;
1228         unsigned int de_len;
1229         unsigned long offset;
1230         struct iso_inode_info *ei = ISOFS_I(inode);
1231         int ret = -EIO;
1232
1233         block = ei->i_iget5_block;
1234         bh = sb_bread(inode->i_sb, block);
1235         if (!bh)
1236                 goto out_badread;
1237
1238         offset = ei->i_iget5_offset;
1239
1240         de = (struct iso_directory_record *) (bh->b_data + offset);
1241         de_len = *(unsigned char *) de;
1242
1243         if (offset + de_len > bufsize) {
1244                 int frag1 = bufsize - offset;
1245
1246                 tmpde = kmalloc(de_len, GFP_KERNEL);
1247                 if (tmpde == NULL) {
1248                         printk(KERN_INFO "%s: out of memory\n", __func__);
1249                         ret = -ENOMEM;
1250                         goto fail;
1251                 }
1252                 memcpy(tmpde, bh->b_data + offset, frag1);
1253                 brelse(bh);
1254                 bh = sb_bread(inode->i_sb, ++block);
1255                 if (!bh)
1256                         goto out_badread;
1257                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1258                 de = tmpde;
1259         }
1260
1261         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1262                                         ei->i_iget5_offset,
1263                                         ISOFS_BUFFER_BITS(inode));
1264
1265         /* Assume it is a normal-format file unless told otherwise */
1266         ei->i_file_format = isofs_file_normal;
1267
1268         if (de->flags[-high_sierra] & 2) {
1269                 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1270                         inode->i_mode = S_IFDIR | sbi->s_dmode;
1271                 else
1272                         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1273                 inode->i_nlink = 1;     /*
1274                                          * Set to 1.  We know there are 2, but
1275                                          * the find utility tries to optimize
1276                                          * if it is 2, and it screws up.  It is
1277                                          * easier to give 1 which tells find to
1278                                          * do it the hard way.
1279                                          */
1280         } else {
1281                 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1282                         inode->i_mode = S_IFREG | sbi->s_fmode;
1283                 } else {
1284                         /*
1285                          * Set default permissions: r-x for all.  The disc
1286                          * could be shared with DOS machines so virtually
1287                          * anything could be a valid executable.
1288                          */
1289                         inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1290                 }
1291                 inode->i_nlink = 1;
1292         }
1293         inode->i_uid = sbi->s_uid;
1294         inode->i_gid = sbi->s_gid;
1295         inode->i_blocks = 0;
1296
1297         ei->i_format_parm[0] = 0;
1298         ei->i_format_parm[1] = 0;
1299         ei->i_format_parm[2] = 0;
1300
1301         ei->i_section_size = isonum_733(de->size);
1302         if (de->flags[-high_sierra] & 0x80) {
1303                 ret = isofs_read_level3_size(inode);
1304                 if (ret < 0)
1305                         goto fail;
1306                 ret = -EIO;
1307         } else {
1308                 ei->i_next_section_block = 0;
1309                 ei->i_next_section_offset = 0;
1310                 inode->i_size = isonum_733(de->size);
1311         }
1312
1313         /*
1314          * Some dipshit decided to store some other bit of information
1315          * in the high byte of the file length.  Truncate size in case
1316          * this CDROM was mounted with the cruft option.
1317          */
1318
1319         if (sbi->s_cruft)
1320                 inode->i_size &= 0x00ffffff;
1321
1322         if (de->interleave[0]) {
1323                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1324                 inode->i_size = 0;
1325         }
1326
1327         /* I have no idea what file_unit_size is used for, so
1328            we will flag it for now */
1329         if (de->file_unit_size[0] != 0) {
1330                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1331                         inode->i_ino);
1332         }
1333
1334         /* I have no idea what other flag bits are used for, so
1335            we will flag it for now */
1336 #ifdef DEBUG
1337         if((de->flags[-high_sierra] & ~2)!= 0){
1338                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1339                                 "(%ld %x).\n",
1340                         inode->i_ino, de->flags[-high_sierra]);
1341         }
1342 #endif
1343
1344         inode->i_mtime.tv_sec =
1345         inode->i_atime.tv_sec =
1346         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1347         inode->i_mtime.tv_nsec =
1348         inode->i_atime.tv_nsec =
1349         inode->i_ctime.tv_nsec = 0;
1350
1351         ei->i_first_extent = (isonum_733(de->extent) +
1352                         isonum_711(de->ext_attr_length));
1353
1354         /* Set the number of blocks for stat() - should be done before RR */
1355         inode->i_blocks = (inode->i_size + 511) >> 9;
1356
1357         /*
1358          * Now test for possible Rock Ridge extensions which will override
1359          * some of these numbers in the inode structure.
1360          */
1361
1362         if (!high_sierra) {
1363                 parse_rock_ridge_inode(de, inode);
1364                 /* if we want uid/gid set, override the rock ridge setting */
1365                 if (sbi->s_uid_set)
1366                         inode->i_uid = sbi->s_uid;
1367                 if (sbi->s_gid_set)
1368                         inode->i_gid = sbi->s_gid;
1369         }
1370         /* Now set final access rights if overriding rock ridge setting */
1371         if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1372             sbi->s_dmode != ISOFS_INVALID_MODE)
1373                 inode->i_mode = S_IFDIR | sbi->s_dmode;
1374         if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1375             sbi->s_fmode != ISOFS_INVALID_MODE)
1376                 inode->i_mode = S_IFREG | sbi->s_fmode;
1377
1378         /* Install the inode operations vector */
1379         if (S_ISREG(inode->i_mode)) {
1380                 inode->i_fop = &generic_ro_fops;
1381                 switch (ei->i_file_format) {
1382 #ifdef CONFIG_ZISOFS
1383                 case isofs_file_compressed:
1384                         inode->i_data.a_ops = &zisofs_aops;
1385                         break;
1386 #endif
1387                 default:
1388                         inode->i_data.a_ops = &isofs_aops;
1389                         break;
1390                 }
1391         } else if (S_ISDIR(inode->i_mode)) {
1392                 inode->i_op = &isofs_dir_inode_operations;
1393                 inode->i_fop = &isofs_dir_operations;
1394         } else if (S_ISLNK(inode->i_mode)) {
1395                 inode->i_op = &page_symlink_inode_operations;
1396                 inode->i_data.a_ops = &isofs_symlink_aops;
1397         } else
1398                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1399                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1400
1401         ret = 0;
1402 out:
1403         kfree(tmpde);
1404         if (bh)
1405                 brelse(bh);
1406         return ret;
1407
1408 out_badread:
1409         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1410 fail:
1411         goto out;
1412 }
1413
1414 struct isofs_iget5_callback_data {
1415         unsigned long block;
1416         unsigned long offset;
1417 };
1418
1419 static int isofs_iget5_test(struct inode *ino, void *data)
1420 {
1421         struct iso_inode_info *i = ISOFS_I(ino);
1422         struct isofs_iget5_callback_data *d =
1423                 (struct isofs_iget5_callback_data*)data;
1424         return (i->i_iget5_block == d->block)
1425                 && (i->i_iget5_offset == d->offset);
1426 }
1427
1428 static int isofs_iget5_set(struct inode *ino, void *data)
1429 {
1430         struct iso_inode_info *i = ISOFS_I(ino);
1431         struct isofs_iget5_callback_data *d =
1432                 (struct isofs_iget5_callback_data*)data;
1433         i->i_iget5_block = d->block;
1434         i->i_iget5_offset = d->offset;
1435         return 0;
1436 }
1437
1438 /* Store, in the inode's containing structure, the block and block
1439  * offset that point to the underlying meta-data for the inode.  The
1440  * code below is otherwise similar to the iget() code in
1441  * include/linux/fs.h */
1442 struct inode *isofs_iget(struct super_block *sb,
1443                          unsigned long block,
1444                          unsigned long offset)
1445 {
1446         unsigned long hashval;
1447         struct inode *inode;
1448         struct isofs_iget5_callback_data data;
1449         long ret;
1450
1451         if (offset >= 1ul << sb->s_blocksize_bits)
1452                 return ERR_PTR(-EINVAL);
1453
1454         data.block = block;
1455         data.offset = offset;
1456
1457         hashval = (block << sb->s_blocksize_bits) | offset;
1458
1459         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1460                                 &isofs_iget5_set, &data);
1461
1462         if (!inode)
1463                 return ERR_PTR(-ENOMEM);
1464
1465         if (inode->i_state & I_NEW) {
1466                 ret = isofs_read_inode(inode);
1467                 if (ret < 0) {
1468                         iget_failed(inode);
1469                         inode = ERR_PTR(ret);
1470                 } else {
1471                         unlock_new_inode(inode);
1472                 }
1473         }
1474
1475         return inode;
1476 }
1477
1478 static int isofs_get_sb(struct file_system_type *fs_type,
1479         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1480 {
1481         return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1482                                 mnt);
1483 }
1484
1485 static struct file_system_type iso9660_fs_type = {
1486         .owner          = THIS_MODULE,
1487         .name           = "iso9660",
1488         .get_sb         = isofs_get_sb,
1489         .kill_sb        = kill_block_super,
1490         .fs_flags       = FS_REQUIRES_DEV,
1491 };
1492
1493 static int __init init_iso9660_fs(void)
1494 {
1495         int err = init_inodecache();
1496         if (err)
1497                 goto out;
1498 #ifdef CONFIG_ZISOFS
1499         err = zisofs_init();
1500         if (err)
1501                 goto out1;
1502 #endif
1503         err = register_filesystem(&iso9660_fs_type);
1504         if (err)
1505                 goto out2;
1506         return 0;
1507 out2:
1508 #ifdef CONFIG_ZISOFS
1509         zisofs_cleanup();
1510 out1:
1511 #endif
1512         destroy_inodecache();
1513 out:
1514         return err;
1515 }
1516
1517 static void __exit exit_iso9660_fs(void)
1518 {
1519         unregister_filesystem(&iso9660_fs_type);
1520 #ifdef CONFIG_ZISOFS
1521         zisofs_cleanup();
1522 #endif
1523         destroy_inodecache();
1524 }
1525
1526 module_init(init_iso9660_fs)
1527 module_exit(exit_iso9660_fs)
1528 MODULE_LICENSE("GPL");
1529 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1530 MODULE_ALIAS("iso9660");