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 #include <linux/mpage.h>
  24 #include <linux/user_namespace.h>
  25
  26 #include "isofs.h"
  27 #include "zisofs.h"
  28
  29 #define BEQUIET
  30
  31 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
  32 static int isofs_hash(const struct dentry *parent, struct qstr *qstr);
  33 static int isofs_dentry_cmpi(const struct dentry *parent,
  34                 const struct dentry *dentry,
  35                 unsigned int len, const char *str, const struct qstr *name);
  36 static int isofs_dentry_cmp(const struct dentry *parent,
  37                 const struct dentry *dentry,
  38                 unsigned int len, const char *str, const struct qstr *name);
  39
  40 #ifdef CONFIG_JOLIET
  41 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
  42 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
  43 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
  44                 const struct dentry *dentry,
  45                 unsigned int len, const char *str, const struct qstr *name);
  46 static int isofs_dentry_cmp_ms(const struct dentry *parent,
  47                 const struct dentry *dentry,
  48                 unsigned int len, const char *str, const struct qstr *name);
  49 #endif
  50
  51 static void isofs_put_super(struct super_block *sb)
  52 {
  53         struct isofs_sb_info *sbi = ISOFS_SB(sb);
  54
  55 #ifdef CONFIG_JOLIET
  56         unload_nls(sbi->s_nls_iocharset);
  57 #endif
  58
  59         kfree(sbi);
  60         sb->s_fs_info = NULL;
  61         return;
  62 }
  63
  64 static int isofs_read_inode(struct inode *);
  65 static int isofs_statfs (struct dentry *, struct kstatfs *);
  66
  67 static struct kmem_cache *isofs_inode_cachep;
  68
  69 static struct inode *isofs_alloc_inode(struct super_block *sb)
  70 {
  71         struct iso_inode_info *ei;
  72         ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
  73         if (!ei)
  74                 return NULL;
  75         return &ei->vfs_inode;
  76 }
  77
  78 static void isofs_i_callback(struct rcu_head *head)
  79 {
  80         struct inode *inode = container_of(head, struct inode, i_rcu);
  81         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
  82 }
  83
  84 static void isofs_destroy_inode(struct inode *inode)
  85 {
  86         call_rcu(&inode->i_rcu, isofs_i_callback);
  87 }
  88
  89 static void init_once(void *foo)
  90 {
  91         struct iso_inode_info *ei = foo;
  92
  93         inode_init_once(&ei->vfs_inode);
  94 }
  95
  96 static int init_inodecache(void)
  97 {
  98         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
  99                                         sizeof(struct iso_inode_info),
 100                                         0, (SLAB_RECLAIM_ACCOUNT|
 101                                         SLAB_MEM_SPREAD),
 102                                         init_once);
 103         if (isofs_inode_cachep == NULL)
 104                 return -ENOMEM;
 105         return 0;
 106 }
 107
 108 static void destroy_inodecache(void)
 109 {
 110         /*
 111          * Make sure all delayed rcu free inodes are flushed before we
 112          * destroy cache.
 113          */
 114         rcu_barrier();
 115         kmem_cache_destroy(isofs_inode_cachep);
 116 }
 117
 118 static int isofs_remount(struct super_block *sb, int *flags, char *data)
 119 {
 120         /* we probably want a lot more here */
 121         *flags |= MS_RDONLY;
 122         return 0;
 123 }
 124
 125 static const struct super_operations isofs_sops = {
 126         .alloc_inode    = isofs_alloc_inode,
 127         .destroy_inode  = isofs_destroy_inode,
 128         .put_super      = isofs_put_super,
 129         .statfs         = isofs_statfs,
 130         .remount_fs     = isofs_remount,
 131         .show_options   = generic_show_options,
 132 };
 133
 134
 135 static const struct dentry_operations isofs_dentry_ops[] = {
 136         {
 137                 .d_hash         = isofs_hash,
 138                 .d_compare      = isofs_dentry_cmp,
 139         },
 140         {
 141                 .d_hash         = isofs_hashi,
 142                 .d_compare      = isofs_dentry_cmpi,
 143         },
 144 #ifdef CONFIG_JOLIET
 145         {
 146                 .d_hash         = isofs_hash_ms,
 147                 .d_compare      = isofs_dentry_cmp_ms,
 148         },
 149         {
 150                 .d_hash         = isofs_hashi_ms,
 151                 .d_compare      = isofs_dentry_cmpi_ms,
 152         },
 153 #endif
 154 };
 155
 156 struct iso9660_options{
 157         unsigned int rock:1;
 158         unsigned int joliet:1;
 159         unsigned int cruft:1;
 160         unsigned int hide:1;
 161         unsigned int showassoc:1;
 162         unsigned int nocompress:1;
 163         unsigned int overriderockperm:1;
 164         unsigned int uid_set:1;
 165         unsigned int gid_set:1;
 166         unsigned int utf8:1;
 167         unsigned char map;
 168         unsigned char check;
 169         unsigned int blocksize;
 170         umode_t fmode;
 171         umode_t dmode;
 172         kgid_t gid;
 173         kuid_t uid;
 174         char *iocharset;
 175         /* LVE */
 176         s32 session;
 177         s32 sbsector;
 178 };
 179
 180 /*
 181  * Compute the hash for the isofs name corresponding to the dentry.
 182  */
 183 static int
 184 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
 185 {
 186         const char *name;
 187         int len;
 188
 189         len = qstr->len;
 190         name = qstr->name;
 191         if (ms) {
 192                 while (len && name[len-1] == '.')
 193                         len--;
 194         }
 195
 196         qstr->hash = full_name_hash(name, len);
 197
 198         return 0;
 199 }
 200
 201 /*
 202  * Compute the hash for the isofs name corresponding to the dentry.
 203  */
 204 static int
 205 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
 206 {
 207         const char *name;
 208         int len;
 209         char c;
 210         unsigned long hash;
 211
 212         len = qstr->len;
 213         name = qstr->name;
 214         if (ms) {
 215                 while (len && name[len-1] == '.')
 216                         len--;
 217         }
 218
 219         hash = init_name_hash();
 220         while (len--) {
 221                 c = tolower(*name++);
 222                 hash = partial_name_hash(c, hash);
 223         }
 224         qstr->hash = end_name_hash(hash);
 225
 226         return 0;
 227 }
 228
 229 /*
 230  * Compare of two isofs names.
 231  */
 232 static int isofs_dentry_cmp_common(
 233                 unsigned int len, const char *str,
 234                 const struct qstr *name, int ms, int ci)
 235 {
 236         int alen, blen;
 237
 238         /* A filename cannot end in '.' or we treat it like it has none */
 239         alen = name->len;
 240         blen = len;
 241         if (ms) {
 242                 while (alen && name->name[alen-1] == '.')
 243                         alen--;
 244                 while (blen && str[blen-1] == '.')
 245                         blen--;
 246         }
 247         if (alen == blen) {
 248                 if (ci) {
 249                         if (strnicmp(name->name, str, alen) == 0)
 250                                 return 0;
 251                 } else {
 252                         if (strncmp(name->name, str, alen) == 0)
 253                                 return 0;
 254                 }
 255         }
 256         return 1;
 257 }
 258
 259 static int
 260 isofs_hash(const struct dentry *dentry, struct qstr *qstr)
 261 {
 262         return isofs_hash_common(dentry, qstr, 0);
 263 }
 264
 265 static int
 266 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
 267 {
 268         return isofs_hashi_common(dentry, qstr, 0);
 269 }
 270
 271 static int
 272 isofs_dentry_cmp(const struct dentry *parent, const struct dentry *dentry,
 273                 unsigned int len, const char *str, const struct qstr *name)
 274 {
 275         return isofs_dentry_cmp_common(len, str, name, 0, 0);
 276 }
 277
 278 static int
 279 isofs_dentry_cmpi(const struct dentry *parent, const struct dentry *dentry,
 280                 unsigned int len, const char *str, const struct qstr *name)
 281 {
 282         return isofs_dentry_cmp_common(len, str, name, 0, 1);
 283 }
 284
 285 #ifdef CONFIG_JOLIET
 286 static int
 287 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
 288 {
 289         return isofs_hash_common(dentry, qstr, 1);
 290 }
 291
 292 static int
 293 isofs_hashi_ms(const 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(const struct dentry *parent, const struct dentry *dentry,
 300                 unsigned int len, const char *str, const struct qstr *name)
 301 {
 302         return isofs_dentry_cmp_common(len, str, name, 1, 0);
 303 }
 304
 305 static int
 306 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry,
 307                 unsigned int len, const char *str, const struct qstr *name)
 308 {
 309         return isofs_dentry_cmp_common(len, str, name, 1, 1);
 310 }
 311 #endif
 312
 313 enum {
 314         Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
 315         Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
 316         Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
 317         Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
 318 };
 319
 320 static const match_table_t tokens = {
 321         {Opt_norock, "norock"},
 322         {Opt_nojoliet, "nojoliet"},
 323         {Opt_unhide, "unhide"},
 324         {Opt_hide, "hide"},
 325         {Opt_showassoc, "showassoc"},
 326         {Opt_cruft, "cruft"},
 327         {Opt_utf8, "utf8"},
 328         {Opt_iocharset, "iocharset=%s"},
 329         {Opt_map_a, "map=acorn"},
 330         {Opt_map_a, "map=a"},
 331         {Opt_map_n, "map=normal"},
 332         {Opt_map_n, "map=n"},
 333         {Opt_map_o, "map=off"},
 334         {Opt_map_o, "map=o"},
 335         {Opt_session, "session=%u"},
 336         {Opt_sb, "sbsector=%u"},
 337         {Opt_check_r, "check=relaxed"},
 338         {Opt_check_r, "check=r"},
 339         {Opt_check_s, "check=strict"},
 340         {Opt_check_s, "check=s"},
 341         {Opt_uid, "uid=%u"},
 342         {Opt_gid, "gid=%u"},
 343         {Opt_mode, "mode=%u"},
 344         {Opt_dmode, "dmode=%u"},
 345         {Opt_overriderockperm, "overriderockperm"},
 346         {Opt_block, "block=%u"},
 347         {Opt_ignore, "conv=binary"},
 348         {Opt_ignore, "conv=b"},
 349         {Opt_ignore, "conv=text"},
 350         {Opt_ignore, "conv=t"},
 351         {Opt_ignore, "conv=mtext"},
 352         {Opt_ignore, "conv=m"},
 353         {Opt_ignore, "conv=auto"},
 354         {Opt_ignore, "conv=a"},
 355         {Opt_nocompress, "nocompress"},
 356         {Opt_err, NULL}
 357 };
 358
 359 static int parse_options(char *options, struct iso9660_options *popt)
 360 {
 361         char *p;
 362         int option;
 363
 364         popt->map = 'n';
 365         popt->rock = 1;
 366         popt->joliet = 1;
 367         popt->cruft = 0;
 368         popt->hide = 0;
 369         popt->showassoc = 0;
 370         popt->check = 'u';              /* unset */
 371         popt->nocompress = 0;
 372         popt->blocksize = 1024;
 373         popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
 374         popt->uid_set = 0;
 375         popt->gid_set = 0;
 376         popt->gid = GLOBAL_ROOT_GID;
 377         popt->uid = GLOBAL_ROOT_UID;
 378         popt->iocharset = NULL;
 379         popt->utf8 = 0;
 380         popt->overriderockperm = 0;
 381         popt->session=-1;
 382         popt->sbsector=-1;
 383         if (!options)
 384                 return 1;
 385
 386         while ((p = strsep(&options, ",")) != NULL) {
 387                 int token;
 388                 substring_t args[MAX_OPT_ARGS];
 389                 unsigned n;
 390
 391                 if (!*p)
 392                         continue;
 393
 394                 token = match_token(p, tokens, args);
 395                 switch (token) {
 396                 case Opt_norock:
 397                         popt->rock = 0;
 398                         break;
 399                 case Opt_nojoliet:
 400                         popt->joliet = 0;
 401                         break;
 402                 case Opt_hide:
 403                         popt->hide = 1;
 404                         break;
 405                 case Opt_unhide:
 406                 case Opt_showassoc:
 407                         popt->showassoc = 1;
 408                         break;
 409                 case Opt_cruft:
 410                         popt->cruft = 1;
 411                         break;
 412                 case Opt_utf8:
 413                         popt->utf8 = 1;
 414                         break;
 415 #ifdef CONFIG_JOLIET
 416                 case Opt_iocharset:
 417                         popt->iocharset = match_strdup(&args[0]);
 418                         break;
 419 #endif
 420                 case Opt_map_a:
 421                         popt->map = 'a';
 422                         break;
 423                 case Opt_map_o:
 424                         popt->map = 'o';
 425                         break;
 426                 case Opt_map_n:
 427                         popt->map = 'n';
 428                         break;
 429                 case Opt_session:
 430                         if (match_int(&args[0], &option))
 431                                 return 0;
 432                         n = option;
 433                         if (n > 99)
 434                                 return 0;
 435                         popt->session = n + 1;
 436                         break;
 437                 case Opt_sb:
 438                         if (match_int(&args[0], &option))
 439                                 return 0;
 440                         popt->sbsector = option;
 441                         break;
 442                 case Opt_check_r:
 443                         popt->check = 'r';
 444                         break;
 445                 case Opt_check_s:
 446                         popt->check = 's';
 447                         break;
 448                 case Opt_ignore:
 449                         break;
 450                 case Opt_uid:
 451                         if (match_int(&args[0], &option))
 452                                 return 0;
 453                         popt->uid = make_kuid(current_user_ns(), option);
 454                         if (!uid_valid(popt->uid))
 455                                 return 0;
 456                         popt->uid_set = 1;
 457                         break;
 458                 case Opt_gid:
 459                         if (match_int(&args[0], &option))
 460                                 return 0;
 461                         popt->gid = make_kgid(current_user_ns(), option);
 462                         if (!gid_valid(popt->gid))
 463                                 return 0;
 464                         popt->gid_set = 1;
 465                         break;
 466                 case Opt_mode:
 467                         if (match_int(&args[0], &option))
 468                                 return 0;
 469                         popt->fmode = option;
 470                         break;
 471                 case Opt_dmode:
 472                         if (match_int(&args[0], &option))
 473                                 return 0;
 474                         popt->dmode = option;
 475                         break;
 476                 case Opt_overriderockperm:
 477                         popt->overriderockperm = 1;
 478                         break;
 479                 case Opt_block:
 480                         if (match_int(&args[0], &option))
 481                                 return 0;
 482                         n = option;
 483                         if (n != 512 && n != 1024 && n != 2048)
 484                                 return 0;
 485                         popt->blocksize = n;
 486                         break;
 487                 case Opt_nocompress:
 488                         popt->nocompress = 1;
 489                         break;
 490                 default:
 491                         return 0;
 492                 }
 493         }
 494         return 1;
 495 }
 496
 497 /*
 498  * look if the driver can tell the multi session redirection value
 499  *
 500  * don't change this if you don't know what you do, please!
 501  * Multisession is legal only with XA disks.
 502  * A non-XA disk with more than one volume descriptor may do it right, but
 503  * usually is written in a nowhere standardized "multi-partition" manner.
 504  * Multisession uses absolute addressing (solely the first frame of the whole
 505  * track is #0), multi-partition uses relative addressing (each first frame of
 506  * each track is #0), and a track is not a session.
 507  *
 508  * A broken CDwriter software or drive firmware does not set new standards,
 509  * at least not if conflicting with the existing ones.
 510  *
 511  * emoenke@gwdg.de
 512  */
 513 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
 514
 515 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
 516 {
 517         struct cdrom_multisession ms_info;
 518         unsigned int vol_desc_start;
 519         struct block_device *bdev = sb->s_bdev;
 520         int i;
 521
 522         vol_desc_start=0;
 523         ms_info.addr_format=CDROM_LBA;
 524         if(session >= 0 && session <= 99) {
 525                 struct cdrom_tocentry Te;
 526                 Te.cdte_track=session;
 527                 Te.cdte_format=CDROM_LBA;
 528                 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
 529                 if (!i) {
 530                         printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
 531                                 session, Te.cdte_addr.lba,
 532                                 Te.cdte_ctrl&CDROM_DATA_TRACK);
 533                         if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
 534                                 return Te.cdte_addr.lba;
 535                 }
 536
 537                 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
 538         }
 539         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
 540         if (session > 0)
 541                 printk(KERN_ERR "ISOFS: Invalid session number\n");
 542 #if 0
 543         printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
 544         if (i==0) {
 545                 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
 546                 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
 547         }
 548 #endif
 549         if (i==0)
 550 #if WE_OBEY_THE_WRITTEN_STANDARDS
 551                 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
 552 #endif
 553                         vol_desc_start=ms_info.addr.lba;
 554         return vol_desc_start;
 555 }
 556
 557 /*
 558  * Check if root directory is empty (has less than 3 files).
 559  *
 560  * Used to detect broken CDs where ISO root directory is empty but Joliet root
 561  * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
 562  * (and Joliet used instead) or else no files would be visible.
 563  */
 564 static bool rootdir_empty(struct super_block *sb, unsigned long block)
 565 {
 566         int offset = 0, files = 0, de_len;
 567         struct iso_directory_record *de;
 568         struct buffer_head *bh;
 569
 570         bh = sb_bread(sb, block);
 571         if (!bh)
 572                 return true;
 573         while (files < 3) {
 574                 de = (struct iso_directory_record *) (bh->b_data + offset);
 575                 de_len = *(unsigned char *) de;
 576                 if (de_len == 0)
 577                         break;
 578                 files++;
 579                 offset += de_len;
 580         }
 581         brelse(bh);
 582         return files < 3;
 583 }
 584
 585 /*
 586  * Initialize the superblock and read the root inode.
 587  *
 588  * Note: a check_disk_change() has been done immediately prior
 589  * to this call, so we don't need to check again.
 590  */
 591 static int isofs_fill_super(struct super_block *s, void *data, int silent)
 592 {
 593         struct buffer_head *bh = NULL, *pri_bh = NULL;
 594         struct hs_primary_descriptor *h_pri = NULL;
 595         struct iso_primary_descriptor *pri = NULL;
 596         struct iso_supplementary_descriptor *sec = NULL;
 597         struct iso_directory_record *rootp;
 598         struct inode *inode;
 599         struct iso9660_options opt;
 600         struct isofs_sb_info *sbi;
 601         unsigned long first_data_zone;
 602         int joliet_level = 0;
 603         int iso_blknum, block;
 604         int orig_zonesize;
 605         int table, error = -EINVAL;
 606         unsigned int vol_desc_start;
 607
 608         save_mount_options(s, data);
 609
 610         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 611         if (!sbi)
 612                 return -ENOMEM;
 613         s->s_fs_info = sbi;
 614
 615         if (!parse_options((char *)data, &opt))
 616                 goto out_freesbi;
 617
 618         /*
 619          * First of all, get the hardware blocksize for this device.
 620          * If we don't know what it is, or the hardware blocksize is
 621          * larger than the blocksize the user specified, then use
 622          * that value.
 623          */
 624         /*
 625          * What if bugger tells us to go beyond page size?
 626          */
 627         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
 628
 629         sbi->s_high_sierra = 0; /* default is iso9660 */
 630
 631         vol_desc_start = (opt.sbsector != -1) ?
 632                 opt.sbsector : isofs_get_last_session(s,opt.session);
 633
 634         for (iso_blknum = vol_desc_start+16;
 635                 iso_blknum < vol_desc_start+100; iso_blknum++) {
 636                 struct hs_volume_descriptor *hdp;
 637                 struct iso_volume_descriptor  *vdp;
 638
 639                 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
 640                 if (!(bh = sb_bread(s, block)))
 641                         goto out_no_read;
 642
 643                 vdp = (struct iso_volume_descriptor *)bh->b_data;
 644                 hdp = (struct hs_volume_descriptor *)bh->b_data;
 645
 646                 /*
 647                  * Due to the overlapping physical location of the descriptors,
 648                  * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
 649                  * proper identification in this case, we first check for ISO.
 650                  */
 651                 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
 652                         if (isonum_711(vdp->type) == ISO_VD_END)
 653                                 break;
 654                         if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
 655                                 if (pri == NULL) {
 656                                         pri = (struct iso_primary_descriptor *)vdp;
 657                                         /* Save the buffer in case we need it ... */
 658                                         pri_bh = bh;
 659                                         bh = NULL;
 660                                 }
 661                         }
 662 #ifdef CONFIG_JOLIET
 663                         else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
 664                                 sec = (struct iso_supplementary_descriptor *)vdp;
 665                                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
 666                                         if (opt.joliet) {
 667                                                 if (sec->escape[2] == 0x40)
 668                                                         joliet_level = 1;
 669                                                 else if (sec->escape[2] == 0x43)
 670                                                         joliet_level = 2;
 671                                                 else if (sec->escape[2] == 0x45)
 672                                                         joliet_level = 3;
 673
 674                                                 printk(KERN_DEBUG "ISO 9660 Extensions: "
 675                                                         "Microsoft Joliet Level %d\n",
 676                                                         joliet_level);
 677                                         }
 678                                         goto root_found;
 679                                 } else {
 680                                 /* Unknown supplementary volume descriptor */
 681                                 sec = NULL;
 682                                 }
 683                         }
 684 #endif
 685                 } else {
 686                         if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
 687                                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
 688                                         goto out_freebh;
 689
 690                                 sbi->s_high_sierra = 1;
 691                                 opt.rock = 0;
 692                                 h_pri = (struct hs_primary_descriptor *)vdp;
 693                                 goto root_found;
 694                         }
 695                 }
 696
 697                 /* Just skip any volume descriptors we don't recognize */
 698
 699                 brelse(bh);
 700                 bh = NULL;
 701         }
 702         /*
 703          * If we fall through, either no volume descriptor was found,
 704          * or else we passed a primary descriptor looking for others.
 705          */
 706         if (!pri)
 707                 goto out_unknown_format;
 708         brelse(bh);
 709         bh = pri_bh;
 710         pri_bh = NULL;
 711
 712 root_found:
 713
 714         if (joliet_level && (pri == NULL || !opt.rock)) {
 715                 /* This is the case of Joliet with the norock mount flag.
 716                  * A disc with both Joliet and Rock Ridge is handled later
 717                  */
 718                 pri = (struct iso_primary_descriptor *) sec;
 719         }
 720
 721         if(sbi->s_high_sierra){
 722                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
 723                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
 724                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
 725                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
 726         } else {
 727                 if (!pri)
 728                         goto out_freebh;
 729                 rootp = (struct iso_directory_record *) pri->root_directory_record;
 730                 sbi->s_nzones = isonum_733(pri->volume_space_size);
 731                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
 732                 sbi->s_max_size = isonum_733(pri->volume_space_size);
 733         }
 734
 735         sbi->s_ninodes = 0; /* No way to figure this out easily */
 736
 737         orig_zonesize = sbi->s_log_zone_size;
 738         /*
 739          * If the zone size is smaller than the hardware sector size,
 740          * this is a fatal error.  This would occur if the disc drive
 741          * had sectors that were 2048 bytes, but the filesystem had
 742          * blocks that were 512 bytes (which should only very rarely
 743          * happen.)
 744          */
 745         if (orig_zonesize < opt.blocksize)
 746                 goto out_bad_size;
 747
 748         /* RDE: convert log zone size to bit shift */
 749         switch (sbi->s_log_zone_size) {
 750         case  512: sbi->s_log_zone_size =  9; break;
 751         case 1024: sbi->s_log_zone_size = 10; break;
 752         case 2048: sbi->s_log_zone_size = 11; break;
 753
 754         default:
 755                 goto out_bad_zone_size;
 756         }
 757
 758         s->s_magic = ISOFS_SUPER_MAGIC;
 759
 760         /*
 761          * With multi-extent files, file size is only limited by the maximum
 762          * size of a file system, which is 8 TB.
 763          */
 764         s->s_maxbytes = 0x80000000000LL;
 765
 766         /*
 767          * The CDROM is read-only, has no nodes (devices) on it, and since
 768          * all of the files appear to be owned by root, we really do not want
 769          * to allow suid.  (suid or devices will not show up unless we have
 770          * Rock Ridge extensions)
 771          */
 772
 773         s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
 774
 775         /* Set this for reference. Its not currently used except on write
 776            which we don't have .. */
 777
 778         first_data_zone = isonum_733(rootp->extent) +
 779                           isonum_711(rootp->ext_attr_length);
 780         sbi->s_firstdatazone = first_data_zone;
 781 #ifndef BEQUIET
 782         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
 783                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
 784         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
 785         if(sbi->s_high_sierra)
 786                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
 787 #endif
 788
 789         /*
 790          * If the Joliet level is set, we _may_ decide to use the
 791          * secondary descriptor, but can't be sure until after we
 792          * read the root inode. But before reading the root inode
 793          * we may need to change the device blocksize, and would
 794          * rather release the old buffer first. So, we cache the
 795          * first_data_zone value from the secondary descriptor.
 796          */
 797         if (joliet_level) {
 798                 pri = (struct iso_primary_descriptor *) sec;
 799                 rootp = (struct iso_directory_record *)
 800                         pri->root_directory_record;
 801                 first_data_zone = isonum_733(rootp->extent) +
 802                                 isonum_711(rootp->ext_attr_length);
 803         }
 804
 805         /*
 806          * We're all done using the volume descriptor, and may need
 807          * to change the device blocksize, so release the buffer now.
 808          */
 809         brelse(pri_bh);
 810         brelse(bh);
 811
 812         /*
 813          * Force the blocksize to 512 for 512 byte sectors.  The file
 814          * read primitives really get it wrong in a bad way if we don't
 815          * do this.
 816          *
 817          * Note - we should never be setting the blocksize to something
 818          * less than the hardware sector size for the device.  If we
 819          * do, we would end up having to read larger buffers and split
 820          * out portions to satisfy requests.
 821          *
 822          * Note2- the idea here is that we want to deal with the optimal
 823          * zonesize in the filesystem.  If we have it set to something less,
 824          * then we have horrible problems with trying to piece together
 825          * bits of adjacent blocks in order to properly read directory
 826          * entries.  By forcing the blocksize in this way, we ensure
 827          * that we will never be required to do this.
 828          */
 829         sb_set_blocksize(s, orig_zonesize);
 830
 831         sbi->s_nls_iocharset = NULL;
 832
 833 #ifdef CONFIG_JOLIET
 834         if (joliet_level && opt.utf8 == 0) {
 835                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
 836                 sbi->s_nls_iocharset = load_nls(p);
 837                 if (! sbi->s_nls_iocharset) {
 838                         /* Fail only if explicit charset specified */
 839                         if (opt.iocharset)
 840                                 goto out_freesbi;
 841                         sbi->s_nls_iocharset = load_nls_default();
 842                 }
 843         }
 844 #endif
 845         s->s_op = &isofs_sops;
 846         s->s_export_op = &isofs_export_ops;
 847         sbi->s_mapping = opt.map;
 848         sbi->s_rock = (opt.rock ? 2 : 0);
 849         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
 850         sbi->s_cruft = opt.cruft;
 851         sbi->s_hide = opt.hide;
 852         sbi->s_showassoc = opt.showassoc;
 853         sbi->s_uid = opt.uid;
 854         sbi->s_gid = opt.gid;
 855         sbi->s_uid_set = opt.uid_set;
 856         sbi->s_gid_set = opt.gid_set;
 857         sbi->s_utf8 = opt.utf8;
 858         sbi->s_nocompress = opt.nocompress;
 859         sbi->s_overriderockperm = opt.overriderockperm;
 860         /*
 861          * It would be incredibly stupid to allow people to mark every file
 862          * on the disk as suid, so we merely allow them to set the default
 863          * permissions.
 864          */
 865         if (opt.fmode != ISOFS_INVALID_MODE)
 866                 sbi->s_fmode = opt.fmode & 0777;
 867         else
 868                 sbi->s_fmode = ISOFS_INVALID_MODE;
 869         if (opt.dmode != ISOFS_INVALID_MODE)
 870                 sbi->s_dmode = opt.dmode & 0777;
 871         else
 872                 sbi->s_dmode = ISOFS_INVALID_MODE;
 873
 874         /*
 875          * Read the root inode, which _may_ result in changing
 876          * the s_rock flag. Once we have the final s_rock value,
 877          * we then decide whether to use the Joliet descriptor.
 878          */
 879         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 880         if (IS_ERR(inode))
 881                 goto out_no_root;
 882
 883         /*
 884          * Fix for broken CDs with Rock Ridge and empty ISO root directory but
 885          * correct Joliet root directory.
 886          */
 887         if (sbi->s_rock == 1 && joliet_level &&
 888                                 rootdir_empty(s, sbi->s_firstdatazone)) {
 889                 printk(KERN_NOTICE
 890                         "ISOFS: primary root directory is empty. "
 891                         "Disabling Rock Ridge and switching to Joliet.");
 892                 sbi->s_rock = 0;
 893         }
 894
 895         /*
 896          * If this disk has both Rock Ridge and Joliet on it, then we
 897          * want to use Rock Ridge by default.  This can be overridden
 898          * by using the norock mount option.  There is still one other
 899          * possibility that is not taken into account: a Rock Ridge
 900          * CD with Unicode names.  Until someone sees such a beast, it
 901          * will not be supported.
 902          */
 903         if (sbi->s_rock == 1) {
 904                 joliet_level = 0;
 905         } else if (joliet_level) {
 906                 sbi->s_rock = 0;
 907                 if (sbi->s_firstdatazone != first_data_zone) {
 908                         sbi->s_firstdatazone = first_data_zone;
 909                         printk(KERN_DEBUG
 910                                 "ISOFS: changing to secondary root\n");
 911                         iput(inode);
 912                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 913                         if (IS_ERR(inode))
 914                                 goto out_no_root;
 915                 }
 916         }
 917
 918         if (opt.check == 'u') {
 919                 /* Only Joliet is case insensitive by default */
 920                 if (joliet_level)
 921                         opt.check = 'r';
 922                 else
 923                         opt.check = 's';
 924         }
 925         sbi->s_joliet_level = joliet_level;
 926
 927         /* Make sure the root inode is a directory */
 928         if (!S_ISDIR(inode->i_mode)) {
 929                 printk(KERN_WARNING
 930                         "isofs_fill_super: root inode is not a directory. "
 931                         "Corrupted media?\n");
 932                 goto out_iput;
 933         }
 934
 935         table = 0;
 936         if (joliet_level)
 937                 table += 2;
 938         if (opt.check == 'r')
 939                 table++;
 940
 941         s->s_d_op = &isofs_dentry_ops[table];
 942
 943         /* get the root dentry */
 944         s->s_root = d_make_root(inode);
 945         if (!(s->s_root)) {
 946                 error = -ENOMEM;
 947                 goto out_no_inode;
 948         }
 949
 950         kfree(opt.iocharset);
 951
 952         return 0;
 953
 954         /*
 955          * Display error messages and free resources.
 956          */
 957 out_iput:
 958         iput(inode);
 959         goto out_no_inode;
 960 out_no_root:
 961         error = PTR_ERR(inode);
 962         if (error != -ENOMEM)
 963                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
 964 out_no_inode:
 965 #ifdef CONFIG_JOLIET
 966         unload_nls(sbi->s_nls_iocharset);
 967 #endif
 968         goto out_freesbi;
 969 out_no_read:
 970         printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
 971                 __func__, s->s_id, iso_blknum, block);
 972         goto out_freebh;
 973 out_bad_zone_size:
 974         printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
 975                 sbi->s_log_zone_size);
 976         goto out_freebh;
 977 out_bad_size:
 978         printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
 979                 orig_zonesize, opt.blocksize);
 980         goto out_freebh;
 981 out_unknown_format:
 982         if (!silent)
 983                 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
 984
 985 out_freebh:
 986         brelse(bh);
 987         brelse(pri_bh);
 988 out_freesbi:
 989         kfree(opt.iocharset);
 990         kfree(sbi);
 991         s->s_fs_info = NULL;
 992         return error;
 993 }
 994
 995 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
 996 {
 997         struct super_block *sb = dentry->d_sb;
 998         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 999
1000         buf->f_type = ISOFS_SUPER_MAGIC;
1001         buf->f_bsize = sb->s_blocksize;
1002         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1003                 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1004         buf->f_bfree = 0;
1005         buf->f_bavail = 0;
1006         buf->f_files = ISOFS_SB(sb)->s_ninodes;
1007         buf->f_ffree = 0;
1008         buf->f_fsid.val[0] = (u32)id;
1009         buf->f_fsid.val[1] = (u32)(id >> 32);
1010         buf->f_namelen = NAME_MAX;
1011         return 0;
1012 }
1013
1014 /*
1015  * Get a set of blocks; filling in buffer_heads if already allocated
1016  * or getblk() if they are not.  Returns the number of blocks inserted
1017  * (-ve == error.)
1018  */
1019 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1020                      struct buffer_head **bh, unsigned long nblocks)
1021 {
1022         unsigned long b_off = iblock;
1023         unsigned offset, sect_size;
1024         unsigned int firstext;
1025         unsigned long nextblk, nextoff;
1026         int section, rv, error;
1027         struct iso_inode_info *ei = ISOFS_I(inode);
1028
1029         error = -EIO;
1030         rv = 0;
1031         if (iblock != b_off) {
1032                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1033                 goto abort;
1034         }
1035
1036
1037         offset = 0;
1038         firstext = ei->i_first_extent;
1039         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1040         nextblk = ei->i_next_section_block;
1041         nextoff = ei->i_next_section_offset;
1042         section = 0;
1043
1044         while (nblocks) {
1045                 /* If we are *way* beyond the end of the file, print a message.
1046                  * Access beyond the end of the file up to the next page boundary
1047                  * is normal, however because of the way the page cache works.
1048                  * In this case, we just return 0 so that we can properly fill
1049                  * the page with useless information without generating any
1050                  * I/O errors.
1051                  */
1052                 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1053                         printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1054                                 __func__, b_off,
1055                                 (unsigned long long)inode->i_size);
1056                         goto abort;
1057                 }
1058
1059                 /* On the last section, nextblk == 0, section size is likely to
1060                  * exceed sect_size by a partial block, and access beyond the
1061                  * end of the file will reach beyond the section size, too.
1062                  */
1063                 while (nextblk && (b_off >= (offset + sect_size))) {
1064                         struct inode *ninode;
1065
1066                         offset += sect_size;
1067                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1068                         if (IS_ERR(ninode)) {
1069                                 error = PTR_ERR(ninode);
1070                                 goto abort;
1071                         }
1072                         firstext  = ISOFS_I(ninode)->i_first_extent;
1073                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1074                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
1075                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1076                         iput(ninode);
1077
1078                         if (++section > 100) {
1079                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1080                                         " aborting...\n", __func__);
1081                                 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1082                                         "nextblk=%lu nextoff=%lu\n", __func__,
1083                                         b_off, firstext, (unsigned) sect_size,
1084                                         nextblk, nextoff);
1085                                 goto abort;
1086                         }
1087                 }
1088
1089                 if (*bh) {
1090                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1091                 } else {
1092                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1093                         if (!*bh)
1094                                 goto abort;
1095                 }
1096                 bh++;   /* Next buffer head */
1097                 b_off++;        /* Next buffer offset */
1098                 nblocks--;
1099                 rv++;
1100         }
1101
1102         error = 0;
1103 abort:
1104         return rv != 0 ? rv : error;
1105 }
1106
1107 /*
1108  * Used by the standard interfaces.
1109  */
1110 static int isofs_get_block(struct inode *inode, sector_t iblock,
1111                     struct buffer_head *bh_result, int create)
1112 {
1113         int ret;
1114
1115         if (create) {
1116                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1117                 return -EROFS;
1118         }
1119
1120         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1121         return ret < 0 ? ret : 0;
1122 }
1123
1124 static int isofs_bmap(struct inode *inode, sector_t block)
1125 {
1126         struct buffer_head dummy;
1127         int error;
1128
1129         dummy.b_state = 0;
1130         dummy.b_blocknr = -1000;
1131         error = isofs_get_block(inode, block, &dummy, 0);
1132         if (!error)
1133                 return dummy.b_blocknr;
1134         return 0;
1135 }
1136
1137 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1138 {
1139         sector_t blknr = isofs_bmap(inode, block);
1140         if (!blknr)
1141                 return NULL;
1142         return sb_bread(inode->i_sb, blknr);
1143 }
1144
1145 static int isofs_readpage(struct file *file, struct page *page)
1146 {
1147         return mpage_readpage(page, isofs_get_block);
1148 }
1149
1150 static int isofs_readpages(struct file *file, struct address_space *mapping,
1151                         struct list_head *pages, unsigned nr_pages)
1152 {
1153         return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1154 }
1155
1156 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1157 {
1158         return generic_block_bmap(mapping,block,isofs_get_block);
1159 }
1160
1161 static const struct address_space_operations isofs_aops = {
1162         .readpage = isofs_readpage,
1163         .readpages = isofs_readpages,
1164         .bmap = _isofs_bmap
1165 };
1166
1167 static int isofs_read_level3_size(struct inode *inode)
1168 {
1169         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1170         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1171         struct buffer_head *bh = NULL;
1172         unsigned long block, offset, block_saved, offset_saved;
1173         int i = 0;
1174         int more_entries = 0;
1175         struct iso_directory_record *tmpde = NULL;
1176         struct iso_inode_info *ei = ISOFS_I(inode);
1177
1178         inode->i_size = 0;
1179
1180         /* The first 16 blocks are reserved as the System Area.  Thus,
1181          * no inodes can appear in block 0.  We use this to flag that
1182          * this is the last section. */
1183         ei->i_next_section_block = 0;
1184         ei->i_next_section_offset = 0;
1185
1186         block = ei->i_iget5_block;
1187         offset = ei->i_iget5_offset;
1188
1189         do {
1190                 struct iso_directory_record *de;
1191                 unsigned int de_len;
1192
1193                 if (!bh) {
1194                         bh = sb_bread(inode->i_sb, block);
1195                         if (!bh)
1196                                 goto out_noread;
1197                 }
1198                 de = (struct iso_directory_record *) (bh->b_data + offset);
1199                 de_len = *(unsigned char *) de;
1200
1201                 if (de_len == 0) {
1202                         brelse(bh);
1203                         bh = NULL;
1204                         ++block;
1205                         offset = 0;
1206                         continue;
1207                 }
1208
1209                 block_saved = block;
1210                 offset_saved = offset;
1211                 offset += de_len;
1212
1213                 /* Make sure we have a full directory entry */
1214                 if (offset >= bufsize) {
1215                         int slop = bufsize - offset + de_len;
1216                         if (!tmpde) {
1217                                 tmpde = kmalloc(256, GFP_KERNEL);
1218                                 if (!tmpde)
1219                                         goto out_nomem;
1220                         }
1221                         memcpy(tmpde, de, slop);
1222                         offset &= bufsize - 1;
1223                         block++;
1224                         brelse(bh);
1225                         bh = NULL;
1226                         if (offset) {
1227                                 bh = sb_bread(inode->i_sb, block);
1228                                 if (!bh)
1229                                         goto out_noread;
1230                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1231                         }
1232                         de = tmpde;
1233                 }
1234
1235                 inode->i_size += isonum_733(de->size);
1236                 if (i == 1) {
1237                         ei->i_next_section_block = block_saved;
1238                         ei->i_next_section_offset = offset_saved;
1239                 }
1240
1241                 more_entries = de->flags[-high_sierra] & 0x80;
1242
1243                 i++;
1244                 if (i > 100)
1245                         goto out_toomany;
1246         } while (more_entries);
1247 out:
1248         kfree(tmpde);
1249         if (bh)
1250                 brelse(bh);
1251         return 0;
1252
1253 out_nomem:
1254         if (bh)
1255                 brelse(bh);
1256         return -ENOMEM;
1257
1258 out_noread:
1259         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1260         kfree(tmpde);
1261         return -EIO;
1262
1263 out_toomany:
1264         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1265                 "isofs_read_level3_size: inode=%lu\n",
1266                 __func__, inode->i_ino);
1267         goto out;
1268 }
1269
1270 static int isofs_read_inode(struct inode *inode)
1271 {
1272         struct super_block *sb = inode->i_sb;
1273         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1274         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1275         unsigned long block;
1276         int high_sierra = sbi->s_high_sierra;
1277         struct buffer_head *bh = NULL;
1278         struct iso_directory_record *de;
1279         struct iso_directory_record *tmpde = NULL;
1280         unsigned int de_len;
1281         unsigned long offset;
1282         struct iso_inode_info *ei = ISOFS_I(inode);
1283         int ret = -EIO;
1284
1285         block = ei->i_iget5_block;
1286         bh = sb_bread(inode->i_sb, block);
1287         if (!bh)
1288                 goto out_badread;
1289
1290         offset = ei->i_iget5_offset;
1291
1292         de = (struct iso_directory_record *) (bh->b_data + offset);
1293         de_len = *(unsigned char *) de;
1294
1295         if (offset + de_len > bufsize) {
1296                 int frag1 = bufsize - offset;
1297
1298                 tmpde = kmalloc(de_len, GFP_KERNEL);
1299                 if (tmpde == NULL) {
1300                         printk(KERN_INFO "%s: out of memory\n", __func__);
1301                         ret = -ENOMEM;
1302                         goto fail;
1303                 }
1304                 memcpy(tmpde, bh->b_data + offset, frag1);
1305                 brelse(bh);
1306                 bh = sb_bread(inode->i_sb, ++block);
1307                 if (!bh)
1308                         goto out_badread;
1309                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1310                 de = tmpde;
1311         }
1312
1313         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1314                                         ei->i_iget5_offset,
1315                                         ISOFS_BUFFER_BITS(inode));
1316
1317         /* Assume it is a normal-format file unless told otherwise */
1318         ei->i_file_format = isofs_file_normal;
1319
1320         if (de->flags[-high_sierra] & 2) {
1321                 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1322                         inode->i_mode = S_IFDIR | sbi->s_dmode;
1323                 else
1324                         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1325                 set_nlink(inode, 1);    /*
1326                                          * Set to 1.  We know there are 2, but
1327                                          * the find utility tries to optimize
1328                                          * if it is 2, and it screws up.  It is
1329                                          * easier to give 1 which tells find to
1330                                          * do it the hard way.
1331                                          */
1332         } else {
1333                 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1334                         inode->i_mode = S_IFREG | sbi->s_fmode;
1335                 } else {
1336                         /*
1337                          * Set default permissions: r-x for all.  The disc
1338                          * could be shared with DOS machines so virtually
1339                          * anything could be a valid executable.
1340                          */
1341                         inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1342                 }
1343                 set_nlink(inode, 1);
1344         }
1345         inode->i_uid = sbi->s_uid;
1346         inode->i_gid = sbi->s_gid;
1347         inode->i_blocks = 0;
1348
1349         ei->i_format_parm[0] = 0;
1350         ei->i_format_parm[1] = 0;
1351         ei->i_format_parm[2] = 0;
1352
1353         ei->i_section_size = isonum_733(de->size);
1354         if (de->flags[-high_sierra] & 0x80) {
1355                 ret = isofs_read_level3_size(inode);
1356                 if (ret < 0)
1357                         goto fail;
1358                 ret = -EIO;
1359         } else {
1360                 ei->i_next_section_block = 0;
1361                 ei->i_next_section_offset = 0;
1362                 inode->i_size = isonum_733(de->size);
1363         }
1364
1365         /*
1366          * Some dipshit decided to store some other bit of information
1367          * in the high byte of the file length.  Truncate size in case
1368          * this CDROM was mounted with the cruft option.
1369          */
1370
1371         if (sbi->s_cruft)
1372                 inode->i_size &= 0x00ffffff;
1373
1374         if (de->interleave[0]) {
1375                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1376                 inode->i_size = 0;
1377         }
1378
1379         /* I have no idea what file_unit_size is used for, so
1380            we will flag it for now */
1381         if (de->file_unit_size[0] != 0) {
1382                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1383                         inode->i_ino);
1384         }
1385
1386         /* I have no idea what other flag bits are used for, so
1387            we will flag it for now */
1388 #ifdef DEBUG
1389         if((de->flags[-high_sierra] & ~2)!= 0){
1390                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1391                                 "(%ld %x).\n",
1392                         inode->i_ino, de->flags[-high_sierra]);
1393         }
1394 #endif
1395
1396         inode->i_mtime.tv_sec =
1397         inode->i_atime.tv_sec =
1398         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1399         inode->i_mtime.tv_nsec =
1400         inode->i_atime.tv_nsec =
1401         inode->i_ctime.tv_nsec = 0;
1402
1403         ei->i_first_extent = (isonum_733(de->extent) +
1404                         isonum_711(de->ext_attr_length));
1405
1406         /* Set the number of blocks for stat() - should be done before RR */
1407         inode->i_blocks = (inode->i_size + 511) >> 9;
1408
1409         /*
1410          * Now test for possible Rock Ridge extensions which will override
1411          * some of these numbers in the inode structure.
1412          */
1413
1414         if (!high_sierra) {
1415                 parse_rock_ridge_inode(de, inode);
1416                 /* if we want uid/gid set, override the rock ridge setting */
1417                 if (sbi->s_uid_set)
1418                         inode->i_uid = sbi->s_uid;
1419                 if (sbi->s_gid_set)
1420                         inode->i_gid = sbi->s_gid;
1421         }
1422         /* Now set final access rights if overriding rock ridge setting */
1423         if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1424             sbi->s_dmode != ISOFS_INVALID_MODE)
1425                 inode->i_mode = S_IFDIR | sbi->s_dmode;
1426         if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1427             sbi->s_fmode != ISOFS_INVALID_MODE)
1428                 inode->i_mode = S_IFREG | sbi->s_fmode;
1429
1430         /* Install the inode operations vector */
1431         if (S_ISREG(inode->i_mode)) {
1432                 inode->i_fop = &generic_ro_fops;
1433                 switch (ei->i_file_format) {
1434 #ifdef CONFIG_ZISOFS
1435                 case isofs_file_compressed:
1436                         inode->i_data.a_ops = &zisofs_aops;
1437                         break;
1438 #endif
1439                 default:
1440                         inode->i_data.a_ops = &isofs_aops;
1441                         break;
1442                 }
1443         } else if (S_ISDIR(inode->i_mode)) {
1444                 inode->i_op = &isofs_dir_inode_operations;
1445                 inode->i_fop = &isofs_dir_operations;
1446         } else if (S_ISLNK(inode->i_mode)) {
1447                 inode->i_op = &page_symlink_inode_operations;
1448                 inode->i_data.a_ops = &isofs_symlink_aops;
1449         } else
1450                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1451                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1452
1453         ret = 0;
1454 out:
1455         kfree(tmpde);
1456         if (bh)
1457                 brelse(bh);
1458         return ret;
1459
1460 out_badread:
1461         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1462 fail:
1463         goto out;
1464 }
1465
1466 struct isofs_iget5_callback_data {
1467         unsigned long block;
1468         unsigned long offset;
1469 };
1470
1471 static int isofs_iget5_test(struct inode *ino, void *data)
1472 {
1473         struct iso_inode_info *i = ISOFS_I(ino);
1474         struct isofs_iget5_callback_data *d =
1475                 (struct isofs_iget5_callback_data*)data;
1476         return (i->i_iget5_block == d->block)
1477                 && (i->i_iget5_offset == d->offset);
1478 }
1479
1480 static int isofs_iget5_set(struct inode *ino, void *data)
1481 {
1482         struct iso_inode_info *i = ISOFS_I(ino);
1483         struct isofs_iget5_callback_data *d =
1484                 (struct isofs_iget5_callback_data*)data;
1485         i->i_iget5_block = d->block;
1486         i->i_iget5_offset = d->offset;
1487         return 0;
1488 }
1489
1490 /* Store, in the inode's containing structure, the block and block
1491  * offset that point to the underlying meta-data for the inode.  The
1492  * code below is otherwise similar to the iget() code in
1493  * include/linux/fs.h */
1494 struct inode *isofs_iget(struct super_block *sb,
1495                          unsigned long block,
1496                          unsigned long offset)
1497 {
1498         unsigned long hashval;
1499         struct inode *inode;
1500         struct isofs_iget5_callback_data data;
1501         long ret;
1502
1503         if (offset >= 1ul << sb->s_blocksize_bits)
1504                 return ERR_PTR(-EINVAL);
1505
1506         data.block = block;
1507         data.offset = offset;
1508
1509         hashval = (block << sb->s_blocksize_bits) | offset;
1510
1511         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1512                                 &isofs_iget5_set, &data);
1513
1514         if (!inode)
1515                 return ERR_PTR(-ENOMEM);
1516
1517         if (inode->i_state & I_NEW) {
1518                 ret = isofs_read_inode(inode);
1519                 if (ret < 0) {
1520                         iget_failed(inode);
1521                         inode = ERR_PTR(ret);
1522                 } else {
1523                         unlock_new_inode(inode);
1524                 }
1525         }
1526
1527         return inode;
1528 }
1529
1530 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1531         int flags, const char *dev_name, void *data)
1532 {
1533         return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1534 }
1535
1536 static struct file_system_type iso9660_fs_type = {
1537         .owner          = THIS_MODULE,
1538         .name           = "iso9660",
1539         .mount          = isofs_mount,
1540         .kill_sb        = kill_block_super,
1541         .fs_flags       = FS_REQUIRES_DEV,
1542 };
1543 MODULE_ALIAS_FS("iso9660");
1544 MODULE_ALIAS("iso9660");
1545
1546 static int __init init_iso9660_fs(void)
1547 {
1548         int err = init_inodecache();
1549         if (err)
1550                 goto out;
1551 #ifdef CONFIG_ZISOFS
1552         err = zisofs_init();
1553         if (err)
1554                 goto out1;
1555 #endif
1556         err = register_filesystem(&iso9660_fs_type);
1557         if (err)
1558                 goto out2;
1559         return 0;
1560 out2:
1561 #ifdef CONFIG_ZISOFS
1562         zisofs_cleanup();
1563 out1:
1564 #endif
1565         destroy_inodecache();
1566 out:
1567         return err;
1568 }
1569
1570 static void __exit exit_iso9660_fs(void)
1571 {
1572         unregister_filesystem(&iso9660_fs_type);
1573 #ifdef CONFIG_ZISOFS
1574         zisofs_cleanup();
1575 #endif
1576         destroy_inodecache();
1577 }
1578
1579 module_init(init_iso9660_fs)
1580 module_exit(exit_iso9660_fs)
1581 MODULE_LICENSE("GPL");