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/statfs.h>
  21 #include <linux/cdrom.h>
  22 #include <linux/parser.h>
  23
  24 #include "isofs.h"
  25 #include "zisofs.h"
  26
  27 #define BEQUIET
  28
  29 static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
  30 static int isofs_hash(struct dentry *parent, struct qstr *qstr);
  31 static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
  32 static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
  33
  34 #ifdef CONFIG_JOLIET
  35 static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
  36 static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
  37 static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
  38 static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
  39 #endif
  40
  41 static void isofs_put_super(struct super_block *sb)
  42 {
  43         struct isofs_sb_info *sbi = ISOFS_SB(sb);
  44
  45 #ifdef CONFIG_JOLIET
  46         unload_nls(sbi->s_nls_iocharset);
  47 #endif
  48
  49         kfree(sbi);
  50         sb->s_fs_info = NULL;
  51         return;
  52 }
  53
  54 static int isofs_read_inode(struct inode *);
  55 static int isofs_statfs (struct dentry *, struct kstatfs *);
  56
  57 static struct kmem_cache *isofs_inode_cachep;
  58
  59 static struct inode *isofs_alloc_inode(struct super_block *sb)
  60 {
  61         struct iso_inode_info *ei;
  62         ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
  63         if (!ei)
  64                 return NULL;
  65         return &ei->vfs_inode;
  66 }
  67
  68 static void isofs_destroy_inode(struct inode *inode)
  69 {
  70         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
  71 }
  72
  73 static void init_once(void *foo)
  74 {
  75         struct iso_inode_info *ei = foo;
  76
  77         inode_init_once(&ei->vfs_inode);
  78 }
  79
  80 static int init_inodecache(void)
  81 {
  82         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
  83                                         sizeof(struct iso_inode_info),
  84                                         0, (SLAB_RECLAIM_ACCOUNT|
  85                                         SLAB_MEM_SPREAD),
  86                                         init_once);
  87         if (isofs_inode_cachep == NULL)
  88                 return -ENOMEM;
  89         return 0;
  90 }
  91
  92 static void destroy_inodecache(void)
  93 {
  94         kmem_cache_destroy(isofs_inode_cachep);
  95 }
  96
  97 static int isofs_remount(struct super_block *sb, int *flags, char *data)
  98 {
  99         /* we probably want a lot more here */
 100         *flags |= MS_RDONLY;
 101         return 0;
 102 }
 103
 104 static const struct super_operations isofs_sops = {
 105         .alloc_inode    = isofs_alloc_inode,
 106         .destroy_inode  = isofs_destroy_inode,
 107         .put_super      = isofs_put_super,
 108         .statfs         = isofs_statfs,
 109         .remount_fs     = isofs_remount,
 110         .show_options   = generic_show_options,
 111 };
 112
 113
 114 static const struct dentry_operations isofs_dentry_ops[] = {
 115         {
 116                 .d_hash         = isofs_hash,
 117                 .d_compare      = isofs_dentry_cmp,
 118         },
 119         {
 120                 .d_hash         = isofs_hashi,
 121                 .d_compare      = isofs_dentry_cmpi,
 122         },
 123 #ifdef CONFIG_JOLIET
 124         {
 125                 .d_hash         = isofs_hash_ms,
 126                 .d_compare      = isofs_dentry_cmp_ms,
 127         },
 128         {
 129                 .d_hash         = isofs_hashi_ms,
 130                 .d_compare      = isofs_dentry_cmpi_ms,
 131         },
 132 #endif
 133 };
 134
 135 struct iso9660_options{
 136         unsigned int rock:1;
 137         unsigned int joliet:1;
 138         unsigned int cruft:1;
 139         unsigned int hide:1;
 140         unsigned int showassoc:1;
 141         unsigned int nocompress:1;
 142         unsigned int overriderockperm:1;
 143         unsigned int uid_set:1;
 144         unsigned int gid_set:1;
 145         unsigned int utf8:1;
 146         unsigned char map;
 147         unsigned char check;
 148         unsigned int blocksize;
 149         mode_t fmode;
 150         mode_t dmode;
 151         gid_t gid;
 152         uid_t uid;
 153         char *iocharset;
 154         /* LVE */
 155         s32 session;
 156         s32 sbsector;
 157 };
 158
 159 /*
 160  * Compute the hash for the isofs name corresponding to the dentry.
 161  */
 162 static int
 163 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
 164 {
 165         const char *name;
 166         int len;
 167
 168         len = qstr->len;
 169         name = qstr->name;
 170         if (ms) {
 171                 while (len && name[len-1] == '.')
 172                         len--;
 173         }
 174
 175         qstr->hash = full_name_hash(name, len);
 176
 177         return 0;
 178 }
 179
 180 /*
 181  * Compute the hash for the isofs name corresponding to the dentry.
 182  */
 183 static int
 184 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
 185 {
 186         const char *name;
 187         int len;
 188         char c;
 189         unsigned long hash;
 190
 191         len = qstr->len;
 192         name = qstr->name;
 193         if (ms) {
 194                 while (len && name[len-1] == '.')
 195                         len--;
 196         }
 197
 198         hash = init_name_hash();
 199         while (len--) {
 200                 c = tolower(*name++);
 201                 hash = partial_name_hash(c, hash);
 202         }
 203         qstr->hash = end_name_hash(hash);
 204
 205         return 0;
 206 }
 207
 208 /*
 209  * Case insensitive compare of two isofs names.
 210  */
 211 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
 212                                 struct qstr *b, int ms)
 213 {
 214         int alen, blen;
 215
 216         /* A filename cannot end in '.' or we treat it like it has none */
 217         alen = a->len;
 218         blen = b->len;
 219         if (ms) {
 220                 while (alen && a->name[alen-1] == '.')
 221                         alen--;
 222                 while (blen && b->name[blen-1] == '.')
 223                         blen--;
 224         }
 225         if (alen == blen) {
 226                 if (strnicmp(a->name, b->name, alen) == 0)
 227                         return 0;
 228         }
 229         return 1;
 230 }
 231
 232 /*
 233  * Case sensitive compare of two isofs names.
 234  */
 235 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
 236                                         struct qstr *b, int ms)
 237 {
 238         int alen, blen;
 239
 240         /* A filename cannot end in '.' or we treat it like it has none */
 241         alen = a->len;
 242         blen = b->len;
 243         if (ms) {
 244                 while (alen && a->name[alen-1] == '.')
 245                         alen--;
 246                 while (blen && b->name[blen-1] == '.')
 247                         blen--;
 248         }
 249         if (alen == blen) {
 250                 if (strncmp(a->name, b->name, alen) == 0)
 251                         return 0;
 252         }
 253         return 1;
 254 }
 255
 256 static int
 257 isofs_hash(struct dentry *dentry, struct qstr *qstr)
 258 {
 259         return isofs_hash_common(dentry, qstr, 0);
 260 }
 261
 262 static int
 263 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
 264 {
 265         return isofs_hashi_common(dentry, qstr, 0);
 266 }
 267
 268 static int
 269 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
 270 {
 271         return isofs_dentry_cmp_common(dentry, a, b, 0);
 272 }
 273
 274 static int
 275 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
 276 {
 277         return isofs_dentry_cmpi_common(dentry, a, b, 0);
 278 }
 279
 280 #ifdef CONFIG_JOLIET
 281 static int
 282 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
 283 {
 284         return isofs_hash_common(dentry, qstr, 1);
 285 }
 286
 287 static int
 288 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
 289 {
 290         return isofs_hashi_common(dentry, qstr, 1);
 291 }
 292
 293 static int
 294 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
 295 {
 296         return isofs_dentry_cmp_common(dentry, a, b, 1);
 297 }
 298
 299 static int
 300 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
 301 {
 302         return isofs_dentry_cmpi_common(dentry, a, b, 1);
 303 }
 304 #endif
 305
 306 enum {
 307         Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
 308         Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
 309         Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
 310         Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
 311 };
 312
 313 static const match_table_t tokens = {
 314         {Opt_norock, "norock"},
 315         {Opt_nojoliet, "nojoliet"},
 316         {Opt_unhide, "unhide"},
 317         {Opt_hide, "hide"},
 318         {Opt_showassoc, "showassoc"},
 319         {Opt_cruft, "cruft"},
 320         {Opt_utf8, "utf8"},
 321         {Opt_iocharset, "iocharset=%s"},
 322         {Opt_map_a, "map=acorn"},
 323         {Opt_map_a, "map=a"},
 324         {Opt_map_n, "map=normal"},
 325         {Opt_map_n, "map=n"},
 326         {Opt_map_o, "map=off"},
 327         {Opt_map_o, "map=o"},
 328         {Opt_session, "session=%u"},
 329         {Opt_sb, "sbsector=%u"},
 330         {Opt_check_r, "check=relaxed"},
 331         {Opt_check_r, "check=r"},
 332         {Opt_check_s, "check=strict"},
 333         {Opt_check_s, "check=s"},
 334         {Opt_uid, "uid=%u"},
 335         {Opt_gid, "gid=%u"},
 336         {Opt_mode, "mode=%u"},
 337         {Opt_dmode, "dmode=%u"},
 338         {Opt_overriderockperm, "overriderockperm"},
 339         {Opt_block, "block=%u"},
 340         {Opt_ignore, "conv=binary"},
 341         {Opt_ignore, "conv=b"},
 342         {Opt_ignore, "conv=text"},
 343         {Opt_ignore, "conv=t"},
 344         {Opt_ignore, "conv=mtext"},
 345         {Opt_ignore, "conv=m"},
 346         {Opt_ignore, "conv=auto"},
 347         {Opt_ignore, "conv=a"},
 348         {Opt_nocompress, "nocompress"},
 349         {Opt_err, NULL}
 350 };
 351
 352 static int parse_options(char *options, struct iso9660_options *popt)
 353 {
 354         char *p;
 355         int option;
 356
 357         popt->map = 'n';
 358         popt->rock = 1;
 359         popt->joliet = 1;
 360         popt->cruft = 0;
 361         popt->hide = 0;
 362         popt->showassoc = 0;
 363         popt->check = 'u';              /* unset */
 364         popt->nocompress = 0;
 365         popt->blocksize = 1024;
 366         popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
 367         popt->uid_set = 0;
 368         popt->gid_set = 0;
 369         popt->gid = 0;
 370         popt->uid = 0;
 371         popt->iocharset = NULL;
 372         popt->utf8 = 0;
 373         popt->overriderockperm = 0;
 374         popt->session=-1;
 375         popt->sbsector=-1;
 376         if (!options)
 377                 return 1;
 378
 379         while ((p = strsep(&options, ",")) != NULL) {
 380                 int token;
 381                 substring_t args[MAX_OPT_ARGS];
 382                 unsigned n;
 383
 384                 if (!*p)
 385                         continue;
 386
 387                 token = match_token(p, tokens, args);
 388                 switch (token) {
 389                 case Opt_norock:
 390                         popt->rock = 0;
 391                         break;
 392                 case Opt_nojoliet:
 393                         popt->joliet = 0;
 394                         break;
 395                 case Opt_hide:
 396                         popt->hide = 1;
 397                         break;
 398                 case Opt_unhide:
 399                 case Opt_showassoc:
 400                         popt->showassoc = 1;
 401                         break;
 402                 case Opt_cruft:
 403                         popt->cruft = 1;
 404                         break;
 405                 case Opt_utf8:
 406                         popt->utf8 = 1;
 407                         break;
 408 #ifdef CONFIG_JOLIET
 409                 case Opt_iocharset:
 410                         popt->iocharset = match_strdup(&args[0]);
 411                         break;
 412 #endif
 413                 case Opt_map_a:
 414                         popt->map = 'a';
 415                         break;
 416                 case Opt_map_o:
 417                         popt->map = 'o';
 418                         break;
 419                 case Opt_map_n:
 420                         popt->map = 'n';
 421                         break;
 422                 case Opt_session:
 423                         if (match_int(&args[0], &option))
 424                                 return 0;
 425                         n = option;
 426                         if (n > 99)
 427                                 return 0;
 428                         popt->session = n + 1;
 429                         break;
 430                 case Opt_sb:
 431                         if (match_int(&args[0], &option))
 432                                 return 0;
 433                         popt->sbsector = option;
 434                         break;
 435                 case Opt_check_r:
 436                         popt->check = 'r';
 437                         break;
 438                 case Opt_check_s:
 439                         popt->check = 's';
 440                         break;
 441                 case Opt_ignore:
 442                         break;
 443                 case Opt_uid:
 444                         if (match_int(&args[0], &option))
 445                                 return 0;
 446                         popt->uid = option;
 447                         popt->uid_set = 1;
 448                         break;
 449                 case Opt_gid:
 450                         if (match_int(&args[0], &option))
 451                                 return 0;
 452                         popt->gid = option;
 453                         popt->gid_set = 1;
 454                         break;
 455                 case Opt_mode:
 456                         if (match_int(&args[0], &option))
 457                                 return 0;
 458                         popt->fmode = option;
 459                         break;
 460                 case Opt_dmode:
 461                         if (match_int(&args[0], &option))
 462                                 return 0;
 463                         popt->dmode = option;
 464                         break;
 465                 case Opt_overriderockperm:
 466                         popt->overriderockperm = 1;
 467                         break;
 468                 case Opt_block:
 469                         if (match_int(&args[0], &option))
 470                                 return 0;
 471                         n = option;
 472                         if (n != 512 && n != 1024 && n != 2048)
 473                                 return 0;
 474                         popt->blocksize = n;
 475                         break;
 476                 case Opt_nocompress:
 477                         popt->nocompress = 1;
 478                         break;
 479                 default:
 480                         return 0;
 481                 }
 482         }
 483         return 1;
 484 }
 485
 486 /*
 487  * look if the driver can tell the multi session redirection value
 488  *
 489  * don't change this if you don't know what you do, please!
 490  * Multisession is legal only with XA disks.
 491  * A non-XA disk with more than one volume descriptor may do it right, but
 492  * usually is written in a nowhere standardized "multi-partition" manner.
 493  * Multisession uses absolute addressing (solely the first frame of the whole
 494  * track is #0), multi-partition uses relative addressing (each first frame of
 495  * each track is #0), and a track is not a session.
 496  *
 497  * A broken CDwriter software or drive firmware does not set new standards,
 498  * at least not if conflicting with the existing ones.
 499  *
 500  * emoenke@gwdg.de
 501  */
 502 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
 503
 504 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
 505 {
 506         struct cdrom_multisession ms_info;
 507         unsigned int vol_desc_start;
 508         struct block_device *bdev = sb->s_bdev;
 509         int i;
 510
 511         vol_desc_start=0;
 512         ms_info.addr_format=CDROM_LBA;
 513         if(session >= 0 && session <= 99) {
 514                 struct cdrom_tocentry Te;
 515                 Te.cdte_track=session;
 516                 Te.cdte_format=CDROM_LBA;
 517                 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
 518                 if (!i) {
 519                         printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
 520                                 session, Te.cdte_addr.lba,
 521                                 Te.cdte_ctrl&CDROM_DATA_TRACK);
 522                         if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
 523                                 return Te.cdte_addr.lba;
 524                 }
 525
 526                 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
 527         }
 528         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
 529         if (session > 0)
 530                 printk(KERN_ERR "ISOFS: Invalid session number\n");
 531 #if 0
 532         printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
 533         if (i==0) {
 534                 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
 535                 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
 536         }
 537 #endif
 538         if (i==0)
 539 #if WE_OBEY_THE_WRITTEN_STANDARDS
 540                 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
 541 #endif
 542                         vol_desc_start=ms_info.addr.lba;
 543         return vol_desc_start;
 544 }
 545
 546 /*
 547  * Initialize the superblock and read the root inode.
 548  *
 549  * Note: a check_disk_change() has been done immediately prior
 550  * to this call, so we don't need to check again.
 551  */
 552 static int isofs_fill_super(struct super_block *s, void *data, int silent)
 553 {
 554         struct buffer_head *bh = NULL, *pri_bh = NULL;
 555         struct hs_primary_descriptor *h_pri = NULL;
 556         struct iso_primary_descriptor *pri = NULL;
 557         struct iso_supplementary_descriptor *sec = NULL;
 558         struct iso_directory_record *rootp;
 559         struct inode *inode;
 560         struct iso9660_options opt;
 561         struct isofs_sb_info *sbi;
 562         unsigned long first_data_zone;
 563         int joliet_level = 0;
 564         int iso_blknum, block;
 565         int orig_zonesize;
 566         int table, error = -EINVAL;
 567         unsigned int vol_desc_start;
 568
 569         save_mount_options(s, data);
 570
 571         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 572         if (!sbi)
 573                 return -ENOMEM;
 574         s->s_fs_info = sbi;
 575
 576         if (!parse_options((char *)data, &opt))
 577                 goto out_freesbi;
 578
 579         /*
 580          * First of all, get the hardware blocksize for this device.
 581          * If we don't know what it is, or the hardware blocksize is
 582          * larger than the blocksize the user specified, then use
 583          * that value.
 584          */
 585         /*
 586          * What if bugger tells us to go beyond page size?
 587          */
 588         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
 589
 590         sbi->s_high_sierra = 0; /* default is iso9660 */
 591
 592         vol_desc_start = (opt.sbsector != -1) ?
 593                 opt.sbsector : isofs_get_last_session(s,opt.session);
 594
 595         for (iso_blknum = vol_desc_start+16;
 596                 iso_blknum < vol_desc_start+100; iso_blknum++) {
 597                 struct hs_volume_descriptor *hdp;
 598                 struct iso_volume_descriptor  *vdp;
 599
 600                 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
 601                 if (!(bh = sb_bread(s, block)))
 602                         goto out_no_read;
 603
 604                 vdp = (struct iso_volume_descriptor *)bh->b_data;
 605                 hdp = (struct hs_volume_descriptor *)bh->b_data;
 606
 607                 /*
 608                  * Due to the overlapping physical location of the descriptors,
 609                  * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
 610                  * proper identification in this case, we first check for ISO.
 611                  */
 612                 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
 613                         if (isonum_711(vdp->type) == ISO_VD_END)
 614                                 break;
 615                         if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
 616                                 if (pri == NULL) {
 617                                         pri = (struct iso_primary_descriptor *)vdp;
 618                                         /* Save the buffer in case we need it ... */
 619                                         pri_bh = bh;
 620                                         bh = NULL;
 621                                 }
 622                         }
 623 #ifdef CONFIG_JOLIET
 624                         else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
 625                                 sec = (struct iso_supplementary_descriptor *)vdp;
 626                                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
 627                                         if (opt.joliet) {
 628                                                 if (sec->escape[2] == 0x40)
 629                                                         joliet_level = 1;
 630                                                 else if (sec->escape[2] == 0x43)
 631                                                         joliet_level = 2;
 632                                                 else if (sec->escape[2] == 0x45)
 633                                                         joliet_level = 3;
 634
 635                                                 printk(KERN_DEBUG "ISO 9660 Extensions: "
 636                                                         "Microsoft Joliet Level %d\n",
 637                                                         joliet_level);
 638                                         }
 639                                         goto root_found;
 640                                 } else {
 641                                 /* Unknown supplementary volume descriptor */
 642                                 sec = NULL;
 643                                 }
 644                         }
 645 #endif
 646                 } else {
 647                         if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
 648                                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
 649                                         goto out_freebh;
 650
 651                                 sbi->s_high_sierra = 1;
 652                                 opt.rock = 0;
 653                                 h_pri = (struct hs_primary_descriptor *)vdp;
 654                                 goto root_found;
 655                         }
 656                 }
 657
 658                 /* Just skip any volume descriptors we don't recognize */
 659
 660                 brelse(bh);
 661                 bh = NULL;
 662         }
 663         /*
 664          * If we fall through, either no volume descriptor was found,
 665          * or else we passed a primary descriptor looking for others.
 666          */
 667         if (!pri)
 668                 goto out_unknown_format;
 669         brelse(bh);
 670         bh = pri_bh;
 671         pri_bh = NULL;
 672
 673 root_found:
 674
 675         if (joliet_level && (pri == NULL || !opt.rock)) {
 676                 /* This is the case of Joliet with the norock mount flag.
 677                  * A disc with both Joliet and Rock Ridge is handled later
 678                  */
 679                 pri = (struct iso_primary_descriptor *) sec;
 680         }
 681
 682         if(sbi->s_high_sierra){
 683                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
 684                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
 685                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
 686                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
 687         } else {
 688                 if (!pri)
 689                         goto out_freebh;
 690                 rootp = (struct iso_directory_record *) pri->root_directory_record;
 691                 sbi->s_nzones = isonum_733(pri->volume_space_size);
 692                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
 693                 sbi->s_max_size = isonum_733(pri->volume_space_size);
 694         }
 695
 696         sbi->s_ninodes = 0; /* No way to figure this out easily */
 697
 698         orig_zonesize = sbi->s_log_zone_size;
 699         /*
 700          * If the zone size is smaller than the hardware sector size,
 701          * this is a fatal error.  This would occur if the disc drive
 702          * had sectors that were 2048 bytes, but the filesystem had
 703          * blocks that were 512 bytes (which should only very rarely
 704          * happen.)
 705          */
 706         if (orig_zonesize < opt.blocksize)
 707                 goto out_bad_size;
 708
 709         /* RDE: convert log zone size to bit shift */
 710         switch (sbi->s_log_zone_size) {
 711         case  512: sbi->s_log_zone_size =  9; break;
 712         case 1024: sbi->s_log_zone_size = 10; break;
 713         case 2048: sbi->s_log_zone_size = 11; break;
 714
 715         default:
 716                 goto out_bad_zone_size;
 717         }
 718
 719         s->s_magic = ISOFS_SUPER_MAGIC;
 720
 721         /*
 722          * With multi-extent files, file size is only limited by the maximum
 723          * size of a file system, which is 8 TB.
 724          */
 725         s->s_maxbytes = 0x80000000000LL;
 726
 727         /*
 728          * The CDROM is read-only, has no nodes (devices) on it, and since
 729          * all of the files appear to be owned by root, we really do not want
 730          * to allow suid.  (suid or devices will not show up unless we have
 731          * Rock Ridge extensions)
 732          */
 733
 734         s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
 735
 736         /* Set this for reference. Its not currently used except on write
 737            which we don't have .. */
 738
 739         first_data_zone = isonum_733(rootp->extent) +
 740                           isonum_711(rootp->ext_attr_length);
 741         sbi->s_firstdatazone = first_data_zone;
 742 #ifndef BEQUIET
 743         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
 744                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
 745         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
 746         if(sbi->s_high_sierra)
 747                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
 748 #endif
 749
 750         /*
 751          * If the Joliet level is set, we _may_ decide to use the
 752          * secondary descriptor, but can't be sure until after we
 753          * read the root inode. But before reading the root inode
 754          * we may need to change the device blocksize, and would
 755          * rather release the old buffer first. So, we cache the
 756          * first_data_zone value from the secondary descriptor.
 757          */
 758         if (joliet_level) {
 759                 pri = (struct iso_primary_descriptor *) sec;
 760                 rootp = (struct iso_directory_record *)
 761                         pri->root_directory_record;
 762                 first_data_zone = isonum_733(rootp->extent) +
 763                                 isonum_711(rootp->ext_attr_length);
 764         }
 765
 766         /*
 767          * We're all done using the volume descriptor, and may need
 768          * to change the device blocksize, so release the buffer now.
 769          */
 770         brelse(pri_bh);
 771         brelse(bh);
 772
 773         /*
 774          * Force the blocksize to 512 for 512 byte sectors.  The file
 775          * read primitives really get it wrong in a bad way if we don't
 776          * do this.
 777          *
 778          * Note - we should never be setting the blocksize to something
 779          * less than the hardware sector size for the device.  If we
 780          * do, we would end up having to read larger buffers and split
 781          * out portions to satisfy requests.
 782          *
 783          * Note2- the idea here is that we want to deal with the optimal
 784          * zonesize in the filesystem.  If we have it set to something less,
 785          * then we have horrible problems with trying to piece together
 786          * bits of adjacent blocks in order to properly read directory
 787          * entries.  By forcing the blocksize in this way, we ensure
 788          * that we will never be required to do this.
 789          */
 790         sb_set_blocksize(s, orig_zonesize);
 791
 792         sbi->s_nls_iocharset = NULL;
 793
 794 #ifdef CONFIG_JOLIET
 795         if (joliet_level && opt.utf8 == 0) {
 796                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
 797                 sbi->s_nls_iocharset = load_nls(p);
 798                 if (! sbi->s_nls_iocharset) {
 799                         /* Fail only if explicit charset specified */
 800                         if (opt.iocharset)
 801                                 goto out_freesbi;
 802                         sbi->s_nls_iocharset = load_nls_default();
 803                 }
 804         }
 805 #endif
 806         s->s_op = &isofs_sops;
 807         s->s_export_op = &isofs_export_ops;
 808         sbi->s_mapping = opt.map;
 809         sbi->s_rock = (opt.rock ? 2 : 0);
 810         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
 811         sbi->s_cruft = opt.cruft;
 812         sbi->s_hide = opt.hide;
 813         sbi->s_showassoc = opt.showassoc;
 814         sbi->s_uid = opt.uid;
 815         sbi->s_gid = opt.gid;
 816         sbi->s_uid_set = opt.uid_set;
 817         sbi->s_gid_set = opt.gid_set;
 818         sbi->s_utf8 = opt.utf8;
 819         sbi->s_nocompress = opt.nocompress;
 820         sbi->s_overriderockperm = opt.overriderockperm;
 821         mutex_init(&sbi->s_mutex);
 822         /*
 823          * It would be incredibly stupid to allow people to mark every file
 824          * on the disk as suid, so we merely allow them to set the default
 825          * permissions.
 826          */
 827         if (opt.fmode != ISOFS_INVALID_MODE)
 828                 sbi->s_fmode = opt.fmode & 0777;
 829         else
 830                 sbi->s_fmode = ISOFS_INVALID_MODE;
 831         if (opt.dmode != ISOFS_INVALID_MODE)
 832                 sbi->s_dmode = opt.dmode & 0777;
 833         else
 834                 sbi->s_dmode = ISOFS_INVALID_MODE;
 835
 836         /*
 837          * Read the root inode, which _may_ result in changing
 838          * the s_rock flag. Once we have the final s_rock value,
 839          * we then decide whether to use the Joliet descriptor.
 840          */
 841         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 842         if (IS_ERR(inode))
 843                 goto out_no_root;
 844
 845         /*
 846          * If this disk has both Rock Ridge and Joliet on it, then we
 847          * want to use Rock Ridge by default.  This can be overridden
 848          * by using the norock mount option.  There is still one other
 849          * possibility that is not taken into account: a Rock Ridge
 850          * CD with Unicode names.  Until someone sees such a beast, it
 851          * will not be supported.
 852          */
 853         if (sbi->s_rock == 1) {
 854                 joliet_level = 0;
 855         } else if (joliet_level) {
 856                 sbi->s_rock = 0;
 857                 if (sbi->s_firstdatazone != first_data_zone) {
 858                         sbi->s_firstdatazone = first_data_zone;
 859                         printk(KERN_DEBUG
 860                                 "ISOFS: changing to secondary root\n");
 861                         iput(inode);
 862                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 863                         if (IS_ERR(inode))
 864                                 goto out_no_root;
 865                 }
 866         }
 867
 868         if (opt.check == 'u') {
 869                 /* Only Joliet is case insensitive by default */
 870                 if (joliet_level)
 871                         opt.check = 'r';
 872                 else
 873                         opt.check = 's';
 874         }
 875         sbi->s_joliet_level = joliet_level;
 876
 877         /* Make sure the root inode is a directory */
 878         if (!S_ISDIR(inode->i_mode)) {
 879                 printk(KERN_WARNING
 880                         "isofs_fill_super: root inode is not a directory. "
 881                         "Corrupted media?\n");
 882                 goto out_iput;
 883         }
 884
 885         /* get the root dentry */
 886         s->s_root = d_alloc_root(inode);
 887         if (!(s->s_root))
 888                 goto out_no_root;
 889
 890         table = 0;
 891         if (joliet_level)
 892                 table += 2;
 893         if (opt.check == 'r')
 894                 table++;
 895         s->s_root->d_op = &isofs_dentry_ops[table];
 896
 897         kfree(opt.iocharset);
 898
 899         return 0;
 900
 901         /*
 902          * Display error messages and free resources.
 903          */
 904 out_iput:
 905         iput(inode);
 906         goto out_no_inode;
 907 out_no_root:
 908         error = PTR_ERR(inode);
 909         if (error != -ENOMEM)
 910                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
 911 out_no_inode:
 912 #ifdef CONFIG_JOLIET
 913         unload_nls(sbi->s_nls_iocharset);
 914 #endif
 915         goto out_freesbi;
 916 out_no_read:
 917         printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
 918                 __func__, s->s_id, iso_blknum, block);
 919         goto out_freesbi;
 920 out_bad_zone_size:
 921         printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
 922                 sbi->s_log_zone_size);
 923         goto out_freebh;
 924 out_bad_size:
 925         printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
 926                 orig_zonesize, opt.blocksize);
 927         goto out_freebh;
 928 out_unknown_format:
 929         if (!silent)
 930                 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
 931
 932 out_freebh:
 933         brelse(bh);
 934 out_freesbi:
 935         kfree(opt.iocharset);
 936         kfree(sbi);
 937         s->s_fs_info = NULL;
 938         return error;
 939 }
 940
 941 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
 942 {
 943         struct super_block *sb = dentry->d_sb;
 944         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 945
 946         buf->f_type = ISOFS_SUPER_MAGIC;
 947         buf->f_bsize = sb->s_blocksize;
 948         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
 949                 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
 950         buf->f_bfree = 0;
 951         buf->f_bavail = 0;
 952         buf->f_files = ISOFS_SB(sb)->s_ninodes;
 953         buf->f_ffree = 0;
 954         buf->f_fsid.val[0] = (u32)id;
 955         buf->f_fsid.val[1] = (u32)(id >> 32);
 956         buf->f_namelen = NAME_MAX;
 957         return 0;
 958 }
 959
 960 /*
 961  * Get a set of blocks; filling in buffer_heads if already allocated
 962  * or getblk() if they are not.  Returns the number of blocks inserted
 963  * (-ve == error.)
 964  */
 965 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
 966                      struct buffer_head **bh, unsigned long nblocks)
 967 {
 968         unsigned long b_off;
 969         unsigned offset, sect_size;
 970         unsigned int firstext;
 971         unsigned long nextblk, nextoff;
 972         long iblock = (long)iblock_s;
 973         int section, rv, error;
 974         struct iso_inode_info *ei = ISOFS_I(inode);
 975
 976         error = -EIO;
 977         rv = 0;
 978         if (iblock < 0 || iblock != iblock_s) {
 979                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
 980                 goto abort;
 981         }
 982
 983         b_off = iblock;
 984
 985         offset = 0;
 986         firstext = ei->i_first_extent;
 987         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
 988         nextblk = ei->i_next_section_block;
 989         nextoff = ei->i_next_section_offset;
 990         section = 0;
 991
 992         while (nblocks) {
 993                 /* If we are *way* beyond the end of the file, print a message.
 994                  * Access beyond the end of the file up to the next page boundary
 995                  * is normal, however because of the way the page cache works.
 996                  * In this case, we just return 0 so that we can properly fill
 997                  * the page with useless information without generating any
 998                  * I/O errors.
 999                  */
1000                 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1001                         printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
1002                                 __func__, iblock, (unsigned long) inode->i_size);
1003                         goto abort;
1004                 }
1005
1006                 /* On the last section, nextblk == 0, section size is likely to
1007                  * exceed sect_size by a partial block, and access beyond the
1008                  * end of the file will reach beyond the section size, too.
1009                  */
1010                 while (nextblk && (b_off >= (offset + sect_size))) {
1011                         struct inode *ninode;
1012
1013                         offset += sect_size;
1014                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1015                         if (IS_ERR(ninode)) {
1016                                 error = PTR_ERR(ninode);
1017                                 goto abort;
1018                         }
1019                         firstext  = ISOFS_I(ninode)->i_first_extent;
1020                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1021                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
1022                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1023                         iput(ninode);
1024
1025                         if (++section > 100) {
1026                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1027                                         " aborting...\n", __func__);
1028                                 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1029                                         "nextblk=%lu nextoff=%lu\n", __func__,
1030                                         iblock, firstext, (unsigned) sect_size,
1031                                         nextblk, nextoff);
1032                                 goto abort;
1033                         }
1034                 }
1035
1036                 if (*bh) {
1037                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1038                 } else {
1039                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1040                         if (!*bh)
1041                                 goto abort;
1042                 }
1043                 bh++;   /* Next buffer head */
1044                 b_off++;        /* Next buffer offset */
1045                 nblocks--;
1046                 rv++;
1047         }
1048
1049         error = 0;
1050 abort:
1051         return rv != 0 ? rv : error;
1052 }
1053
1054 /*
1055  * Used by the standard interfaces.
1056  */
1057 static int isofs_get_block(struct inode *inode, sector_t iblock,
1058                     struct buffer_head *bh_result, int create)
1059 {
1060         int ret;
1061
1062         if (create) {
1063                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1064                 return -EROFS;
1065         }
1066
1067         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1068         return ret < 0 ? ret : 0;
1069 }
1070
1071 static int isofs_bmap(struct inode *inode, sector_t block)
1072 {
1073         struct buffer_head dummy;
1074         int error;
1075
1076         dummy.b_state = 0;
1077         dummy.b_blocknr = -1000;
1078         error = isofs_get_block(inode, block, &dummy, 0);
1079         if (!error)
1080                 return dummy.b_blocknr;
1081         return 0;
1082 }
1083
1084 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1085 {
1086         sector_t blknr = isofs_bmap(inode, block);
1087         if (!blknr)
1088                 return NULL;
1089         return sb_bread(inode->i_sb, blknr);
1090 }
1091
1092 static int isofs_readpage(struct file *file, struct page *page)
1093 {
1094         return block_read_full_page(page,isofs_get_block);
1095 }
1096
1097 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1098 {
1099         return generic_block_bmap(mapping,block,isofs_get_block);
1100 }
1101
1102 static const struct address_space_operations isofs_aops = {
1103         .readpage = isofs_readpage,
1104         .sync_page = block_sync_page,
1105         .bmap = _isofs_bmap
1106 };
1107
1108 static int isofs_read_level3_size(struct inode *inode)
1109 {
1110         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1111         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1112         struct buffer_head *bh = NULL;
1113         unsigned long block, offset, block_saved, offset_saved;
1114         int i = 0;
1115         int more_entries = 0;
1116         struct iso_directory_record *tmpde = NULL;
1117         struct iso_inode_info *ei = ISOFS_I(inode);
1118
1119         inode->i_size = 0;
1120
1121         /* The first 16 blocks are reserved as the System Area.  Thus,
1122          * no inodes can appear in block 0.  We use this to flag that
1123          * this is the last section. */
1124         ei->i_next_section_block = 0;
1125         ei->i_next_section_offset = 0;
1126
1127         block = ei->i_iget5_block;
1128         offset = ei->i_iget5_offset;
1129
1130         do {
1131                 struct iso_directory_record *de;
1132                 unsigned int de_len;
1133
1134                 if (!bh) {
1135                         bh = sb_bread(inode->i_sb, block);
1136                         if (!bh)
1137                                 goto out_noread;
1138                 }
1139                 de = (struct iso_directory_record *) (bh->b_data + offset);
1140                 de_len = *(unsigned char *) de;
1141
1142                 if (de_len == 0) {
1143                         brelse(bh);
1144                         bh = NULL;
1145                         ++block;
1146                         offset = 0;
1147                         continue;
1148                 }
1149
1150                 block_saved = block;
1151                 offset_saved = offset;
1152                 offset += de_len;
1153
1154                 /* Make sure we have a full directory entry */
1155                 if (offset >= bufsize) {
1156                         int slop = bufsize - offset + de_len;
1157                         if (!tmpde) {
1158                                 tmpde = kmalloc(256, GFP_KERNEL);
1159                                 if (!tmpde)
1160                                         goto out_nomem;
1161                         }
1162                         memcpy(tmpde, de, slop);
1163                         offset &= bufsize - 1;
1164                         block++;
1165                         brelse(bh);
1166                         bh = NULL;
1167                         if (offset) {
1168                                 bh = sb_bread(inode->i_sb, block);
1169                                 if (!bh)
1170                                         goto out_noread;
1171                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1172                         }
1173                         de = tmpde;
1174                 }
1175
1176                 inode->i_size += isonum_733(de->size);
1177                 if (i == 1) {
1178                         ei->i_next_section_block = block_saved;
1179                         ei->i_next_section_offset = offset_saved;
1180                 }
1181
1182                 more_entries = de->flags[-high_sierra] & 0x80;
1183
1184                 i++;
1185                 if (i > 100)
1186                         goto out_toomany;
1187         } while (more_entries);
1188 out:
1189         kfree(tmpde);
1190         if (bh)
1191                 brelse(bh);
1192         return 0;
1193
1194 out_nomem:
1195         if (bh)
1196                 brelse(bh);
1197         return -ENOMEM;
1198
1199 out_noread:
1200         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1201         kfree(tmpde);
1202         return -EIO;
1203
1204 out_toomany:
1205         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1206                 "isofs_read_level3_size: inode=%lu\n",
1207                 __func__, inode->i_ino);
1208         goto out;
1209 }
1210
1211 static int isofs_read_inode(struct inode *inode)
1212 {
1213         struct super_block *sb = inode->i_sb;
1214         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1215         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1216         unsigned long block;
1217         int high_sierra = sbi->s_high_sierra;
1218         struct buffer_head *bh = NULL;
1219         struct iso_directory_record *de;
1220         struct iso_directory_record *tmpde = NULL;
1221         unsigned int de_len;
1222         unsigned long offset;
1223         struct iso_inode_info *ei = ISOFS_I(inode);
1224         int ret = -EIO;
1225
1226         block = ei->i_iget5_block;
1227         bh = sb_bread(inode->i_sb, block);
1228         if (!bh)
1229                 goto out_badread;
1230
1231         offset = ei->i_iget5_offset;
1232
1233         de = (struct iso_directory_record *) (bh->b_data + offset);
1234         de_len = *(unsigned char *) de;
1235
1236         if (offset + de_len > bufsize) {
1237                 int frag1 = bufsize - offset;
1238
1239                 tmpde = kmalloc(de_len, GFP_KERNEL);
1240                 if (tmpde == NULL) {
1241                         printk(KERN_INFO "%s: out of memory\n", __func__);
1242                         ret = -ENOMEM;
1243                         goto fail;
1244                 }
1245                 memcpy(tmpde, bh->b_data + offset, frag1);
1246                 brelse(bh);
1247                 bh = sb_bread(inode->i_sb, ++block);
1248                 if (!bh)
1249                         goto out_badread;
1250                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1251                 de = tmpde;
1252         }
1253
1254         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1255                                         ei->i_iget5_offset,
1256                                         ISOFS_BUFFER_BITS(inode));
1257
1258         /* Assume it is a normal-format file unless told otherwise */
1259         ei->i_file_format = isofs_file_normal;
1260
1261         if (de->flags[-high_sierra] & 2) {
1262                 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1263                         inode->i_mode = S_IFDIR | sbi->s_dmode;
1264                 else
1265                         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1266                 inode->i_nlink = 1;     /*
1267                                          * Set to 1.  We know there are 2, but
1268                                          * the find utility tries to optimize
1269                                          * if it is 2, and it screws up.  It is
1270                                          * easier to give 1 which tells find to
1271                                          * do it the hard way.
1272                                          */
1273         } else {
1274                 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1275                         inode->i_mode = S_IFREG | sbi->s_fmode;
1276                 } else {
1277                         /*
1278                          * Set default permissions: r-x for all.  The disc
1279                          * could be shared with DOS machines so virtually
1280                          * anything could be a valid executable.
1281                          */
1282                         inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1283                 }
1284                 inode->i_nlink = 1;
1285         }
1286         inode->i_uid = sbi->s_uid;
1287         inode->i_gid = sbi->s_gid;
1288         inode->i_blocks = 0;
1289
1290         ei->i_format_parm[0] = 0;
1291         ei->i_format_parm[1] = 0;
1292         ei->i_format_parm[2] = 0;
1293
1294         ei->i_section_size = isonum_733(de->size);
1295         if (de->flags[-high_sierra] & 0x80) {
1296                 ret = isofs_read_level3_size(inode);
1297                 if (ret < 0)
1298                         goto fail;
1299                 ret = -EIO;
1300         } else {
1301                 ei->i_next_section_block = 0;
1302                 ei->i_next_section_offset = 0;
1303                 inode->i_size = isonum_733(de->size);
1304         }
1305
1306         /*
1307          * Some dipshit decided to store some other bit of information
1308          * in the high byte of the file length.  Truncate size in case
1309          * this CDROM was mounted with the cruft option.
1310          */
1311
1312         if (sbi->s_cruft)
1313                 inode->i_size &= 0x00ffffff;
1314
1315         if (de->interleave[0]) {
1316                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1317                 inode->i_size = 0;
1318         }
1319
1320         /* I have no idea what file_unit_size is used for, so
1321            we will flag it for now */
1322         if (de->file_unit_size[0] != 0) {
1323                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1324                         inode->i_ino);
1325         }
1326
1327         /* I have no idea what other flag bits are used for, so
1328            we will flag it for now */
1329 #ifdef DEBUG
1330         if((de->flags[-high_sierra] & ~2)!= 0){
1331                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1332                                 "(%ld %x).\n",
1333                         inode->i_ino, de->flags[-high_sierra]);
1334         }
1335 #endif
1336
1337         inode->i_mtime.tv_sec =
1338         inode->i_atime.tv_sec =
1339         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1340         inode->i_mtime.tv_nsec =
1341         inode->i_atime.tv_nsec =
1342         inode->i_ctime.tv_nsec = 0;
1343
1344         ei->i_first_extent = (isonum_733(de->extent) +
1345                         isonum_711(de->ext_attr_length));
1346
1347         /* Set the number of blocks for stat() - should be done before RR */
1348         inode->i_blocks = (inode->i_size + 511) >> 9;
1349
1350         /*
1351          * Now test for possible Rock Ridge extensions which will override
1352          * some of these numbers in the inode structure.
1353          */
1354
1355         if (!high_sierra) {
1356                 parse_rock_ridge_inode(de, inode);
1357                 /* if we want uid/gid set, override the rock ridge setting */
1358                 if (sbi->s_uid_set)
1359                         inode->i_uid = sbi->s_uid;
1360                 if (sbi->s_gid_set)
1361                         inode->i_gid = sbi->s_gid;
1362         }
1363         /* Now set final access rights if overriding rock ridge setting */
1364         if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1365             sbi->s_dmode != ISOFS_INVALID_MODE)
1366                 inode->i_mode = S_IFDIR | sbi->s_dmode;
1367         if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1368             sbi->s_fmode != ISOFS_INVALID_MODE)
1369                 inode->i_mode = S_IFREG | sbi->s_fmode;
1370
1371         /* Install the inode operations vector */
1372         if (S_ISREG(inode->i_mode)) {
1373                 inode->i_fop = &generic_ro_fops;
1374                 switch (ei->i_file_format) {
1375 #ifdef CONFIG_ZISOFS
1376                 case isofs_file_compressed:
1377                         inode->i_data.a_ops = &zisofs_aops;
1378                         break;
1379 #endif
1380                 default:
1381                         inode->i_data.a_ops = &isofs_aops;
1382                         break;
1383                 }
1384         } else if (S_ISDIR(inode->i_mode)) {
1385                 inode->i_op = &isofs_dir_inode_operations;
1386                 inode->i_fop = &isofs_dir_operations;
1387         } else if (S_ISLNK(inode->i_mode)) {
1388                 inode->i_op = &page_symlink_inode_operations;
1389                 inode->i_data.a_ops = &isofs_symlink_aops;
1390         } else
1391                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1392                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1393
1394         ret = 0;
1395 out:
1396         kfree(tmpde);
1397         if (bh)
1398                 brelse(bh);
1399         return ret;
1400
1401 out_badread:
1402         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1403 fail:
1404         goto out;
1405 }
1406
1407 struct isofs_iget5_callback_data {
1408         unsigned long block;
1409         unsigned long offset;
1410 };
1411
1412 static int isofs_iget5_test(struct inode *ino, void *data)
1413 {
1414         struct iso_inode_info *i = ISOFS_I(ino);
1415         struct isofs_iget5_callback_data *d =
1416                 (struct isofs_iget5_callback_data*)data;
1417         return (i->i_iget5_block == d->block)
1418                 && (i->i_iget5_offset == d->offset);
1419 }
1420
1421 static int isofs_iget5_set(struct inode *ino, void *data)
1422 {
1423         struct iso_inode_info *i = ISOFS_I(ino);
1424         struct isofs_iget5_callback_data *d =
1425                 (struct isofs_iget5_callback_data*)data;
1426         i->i_iget5_block = d->block;
1427         i->i_iget5_offset = d->offset;
1428         return 0;
1429 }
1430
1431 /* Store, in the inode's containing structure, the block and block
1432  * offset that point to the underlying meta-data for the inode.  The
1433  * code below is otherwise similar to the iget() code in
1434  * include/linux/fs.h */
1435 struct inode *isofs_iget(struct super_block *sb,
1436                          unsigned long block,
1437                          unsigned long offset)
1438 {
1439         unsigned long hashval;
1440         struct inode *inode;
1441         struct isofs_iget5_callback_data data;
1442         long ret;
1443
1444         if (offset >= 1ul << sb->s_blocksize_bits)
1445                 return ERR_PTR(-EINVAL);
1446
1447         data.block = block;
1448         data.offset = offset;
1449
1450         hashval = (block << sb->s_blocksize_bits) | offset;
1451
1452         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1453                                 &isofs_iget5_set, &data);
1454
1455         if (!inode)
1456                 return ERR_PTR(-ENOMEM);
1457
1458         if (inode->i_state & I_NEW) {
1459                 ret = isofs_read_inode(inode);
1460                 if (ret < 0) {
1461                         iget_failed(inode);
1462                         inode = ERR_PTR(ret);
1463                 } else {
1464                         unlock_new_inode(inode);
1465                 }
1466         }
1467
1468         return inode;
1469 }
1470
1471 static int isofs_get_sb(struct file_system_type *fs_type,
1472         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1473 {
1474         return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1475                                 mnt);
1476 }
1477
1478 static struct file_system_type iso9660_fs_type = {
1479         .owner          = THIS_MODULE,
1480         .name           = "iso9660",
1481         .get_sb         = isofs_get_sb,
1482         .kill_sb        = kill_block_super,
1483         .fs_flags       = FS_REQUIRES_DEV,
1484 };
1485
1486 static int __init init_iso9660_fs(void)
1487 {
1488         int err = init_inodecache();
1489         if (err)
1490                 goto out;
1491 #ifdef CONFIG_ZISOFS
1492         err = zisofs_init();
1493         if (err)
1494                 goto out1;
1495 #endif
1496         err = register_filesystem(&iso9660_fs_type);
1497         if (err)
1498                 goto out2;
1499         return 0;
1500 out2:
1501 #ifdef CONFIG_ZISOFS
1502         zisofs_cleanup();
1503 out1:
1504 #endif
1505         destroy_inodecache();
1506 out:
1507         return err;
1508 }
1509
1510 static void __exit exit_iso9660_fs(void)
1511 {
1512         unregister_filesystem(&iso9660_fs_type);
1513 #ifdef CONFIG_ZISOFS
1514         zisofs_cleanup();
1515 #endif
1516         destroy_inodecache();
1517 }
1518
1519 module_init(init_iso9660_fs)
1520 module_exit(exit_iso9660_fs)
1521 MODULE_LICENSE("GPL");
1522 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1523 MODULE_ALIAS("iso9660");