fs/isofs/inode.c

   1 /*
   2  *  linux/fs/isofs/inode.c
   3  *
   4  *  (C) 1991  Linus Torvalds - minix filesystem
   5  *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
   6  *      1994  Eberhard Mönkeberg - multi session handling.
   7  *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
   8  *      1997  Gordon Chaffee - Joliet CDs
   9  *      1998  Eric Lammerts - ISO 9660 Level 3
  10  *      2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
  11  *      2004  Paul Serice - NFS Export Operations
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16
  17 #include <linux/slab.h>
  18 #include <linux/nls.h>
  19 #include <linux/ctype.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/statfs.h>
  22 #include <linux/cdrom.h>
  23 #include <linux/parser.h>
  24
  25 #include "isofs.h"
  26 #include "zisofs.h"
  27
  28 #define BEQUIET
  29
  30 static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
  31 static int isofs_hash(struct dentry *parent, struct qstr *qstr);
  32 static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
  33 static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
  34
  35 #ifdef CONFIG_JOLIET
  36 static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
  37 static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
  38 static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
  39 static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
  40 #endif
  41
  42 static void isofs_put_super(struct super_block *sb)
  43 {
  44         struct isofs_sb_info *sbi = ISOFS_SB(sb);
  45 #ifdef CONFIG_JOLIET
  46         if (sbi->s_nls_iocharset) {
  47                 unload_nls(sbi->s_nls_iocharset);
  48                 sbi->s_nls_iocharset = NULL;
  49         }
  50 #endif
  51
  52         kfree(sbi);
  53         sb->s_fs_info = NULL;
  54         return;
  55 }
  56
  57 static int isofs_read_inode(struct inode *);
  58 static int isofs_statfs (struct dentry *, struct kstatfs *);
  59
  60 static struct kmem_cache *isofs_inode_cachep;
  61
  62 static struct inode *isofs_alloc_inode(struct super_block *sb)
  63 {
  64         struct iso_inode_info *ei;
  65         ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
  66         if (!ei)
  67                 return NULL;
  68         return &ei->vfs_inode;
  69 }
  70
  71 static void isofs_destroy_inode(struct inode *inode)
  72 {
  73         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
  74 }
  75
  76 static void init_once(void *foo)
  77 {
  78         struct iso_inode_info *ei = foo;
  79
  80         inode_init_once(&ei->vfs_inode);
  81 }
  82
  83 static int init_inodecache(void)
  84 {
  85         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
  86                                         sizeof(struct iso_inode_info),
  87                                         0, (SLAB_RECLAIM_ACCOUNT|
  88                                         SLAB_MEM_SPREAD),
  89                                         init_once);
  90         if (isofs_inode_cachep == NULL)
  91                 return -ENOMEM;
  92         return 0;
  93 }
  94
  95 static void destroy_inodecache(void)
  96 {
  97         kmem_cache_destroy(isofs_inode_cachep);
  98 }
  99
 100 static int isofs_remount(struct super_block *sb, int *flags, char *data)
 101 {
 102         /* we probably want a lot more here */
 103         *flags |= MS_RDONLY;
 104         return 0;
 105 }
 106
 107 static const struct super_operations isofs_sops = {
 108         .alloc_inode    = isofs_alloc_inode,
 109         .destroy_inode  = isofs_destroy_inode,
 110         .put_super      = isofs_put_super,
 111         .statfs         = isofs_statfs,
 112         .remount_fs     = isofs_remount,
 113         .show_options   = generic_show_options,
 114 };
 115
 116
 117 static struct dentry_operations isofs_dentry_ops[] = {
 118         {
 119                 .d_hash         = isofs_hash,
 120                 .d_compare      = isofs_dentry_cmp,
 121         },
 122         {
 123                 .d_hash         = isofs_hashi,
 124                 .d_compare      = isofs_dentry_cmpi,
 125         },
 126 #ifdef CONFIG_JOLIET
 127         {
 128                 .d_hash         = isofs_hash_ms,
 129                 .d_compare      = isofs_dentry_cmp_ms,
 130         },
 131         {
 132                 .d_hash         = isofs_hashi_ms,
 133                 .d_compare      = isofs_dentry_cmpi_ms,
 134         },
 135 #endif
 136 };
 137
 138 struct iso9660_options{
 139         char map;
 140         char rock;
 141         char joliet;
 142         char cruft;
 143         char hide;
 144         char showassoc;
 145         char nocompress;
 146         unsigned char check;
 147         unsigned int blocksize;
 148         mode_t fmode;
 149         mode_t dmode;
 150         gid_t gid;
 151         uid_t uid;
 152         char *iocharset;
 153         unsigned char utf8;
 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,
 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_block, "block=%u"},
 339         {Opt_ignore, "conv=binary"},
 340         {Opt_ignore, "conv=b"},
 341         {Opt_ignore, "conv=text"},
 342         {Opt_ignore, "conv=t"},
 343         {Opt_ignore, "conv=mtext"},
 344         {Opt_ignore, "conv=m"},
 345         {Opt_ignore, "conv=auto"},
 346         {Opt_ignore, "conv=a"},
 347         {Opt_nocompress, "nocompress"},
 348         {Opt_err, NULL}
 349 };
 350
 351 static int parse_options(char *options, struct iso9660_options *popt)
 352 {
 353         char *p;
 354         int option;
 355
 356         popt->map = 'n';
 357         popt->rock = 'y';
 358         popt->joliet = 'y';
 359         popt->cruft = 'n';
 360         popt->hide = 'n';
 361         popt->showassoc = 'n';
 362         popt->check = 'u';              /* unset */
 363         popt->nocompress = 0;
 364         popt->blocksize = 1024;
 365         popt->fmode = popt->dmode = S_IRUGO | S_IXUGO; /*
 366                                          * r-x for all.  The disc could
 367                                          * be shared with DOS machines so
 368                                          * virtually anything could be
 369                                          * a valid executable.
 370                                          */
 371         popt->gid = 0;
 372         popt->uid = 0;
 373         popt->iocharset = NULL;
 374         popt->utf8 = 0;
 375         popt->session=-1;
 376         popt->sbsector=-1;
 377         if (!options)
 378                 return 1;
 379
 380         while ((p = strsep(&options, ",")) != NULL) {
 381                 int token;
 382                 substring_t args[MAX_OPT_ARGS];
 383                 unsigned n;
 384
 385                 if (!*p)
 386                         continue;
 387
 388                 token = match_token(p, tokens, args);
 389                 switch (token) {
 390                 case Opt_norock:
 391                         popt->rock = 'n';
 392                         break;
 393                 case Opt_nojoliet:
 394                         popt->joliet = 'n';
 395                         break;
 396                 case Opt_hide:
 397                         popt->hide = 'y';
 398                         break;
 399                 case Opt_unhide:
 400                 case Opt_showassoc:
 401                         popt->showassoc = 'y';
 402                         break;
 403                 case Opt_cruft:
 404                         popt->cruft = 'y';
 405                         break;
 406                 case Opt_utf8:
 407                         popt->utf8 = 1;
 408                         break;
 409 #ifdef CONFIG_JOLIET
 410                 case Opt_iocharset:
 411                         popt->iocharset = match_strdup(&args[0]);
 412                         break;
 413 #endif
 414                 case Opt_map_a:
 415                         popt->map = 'a';
 416                         break;
 417                 case Opt_map_o:
 418                         popt->map = 'o';
 419                         break;
 420                 case Opt_map_n:
 421                         popt->map = 'n';
 422                         break;
 423                 case Opt_session:
 424                         if (match_int(&args[0], &option))
 425                                 return 0;
 426                         n = option;
 427                         if (n > 99)
 428                                 return 0;
 429                         popt->session = n + 1;
 430                         break;
 431                 case Opt_sb:
 432                         if (match_int(&args[0], &option))
 433                                 return 0;
 434                         popt->sbsector = option;
 435                         break;
 436                 case Opt_check_r:
 437                         popt->check = 'r';
 438                         break;
 439                 case Opt_check_s:
 440                         popt->check = 's';
 441                         break;
 442                 case Opt_ignore:
 443                         break;
 444                 case Opt_uid:
 445                         if (match_int(&args[0], &option))
 446                                 return 0;
 447                         popt->uid = option;
 448                         break;
 449                 case Opt_gid:
 450                         if (match_int(&args[0], &option))
 451                                 return 0;
 452                         popt->gid = option;
 453                         break;
 454                 case Opt_mode:
 455                         if (match_int(&args[0], &option))
 456                                 return 0;
 457                         popt->fmode = option;
 458                         break;
 459                 case Opt_dmode:
 460                         if (match_int(&args[0], &option))
 461                                 return 0;
 462                         popt->dmode = option;
 463                         break;
 464                 case Opt_block:
 465                         if (match_int(&args[0], &option))
 466                                 return 0;
 467                         n = option;
 468                         if (n != 512 && n != 1024 && n != 2048)
 469                                 return 0;
 470                         popt->blocksize = n;
 471                         break;
 472                 case Opt_nocompress:
 473                         popt->nocompress = 1;
 474                         break;
 475                 default:
 476                         return 0;
 477                 }
 478         }
 479         return 1;
 480 }
 481
 482 /*
 483  * look if the driver can tell the multi session redirection value
 484  *
 485  * don't change this if you don't know what you do, please!
 486  * Multisession is legal only with XA disks.
 487  * A non-XA disk with more than one volume descriptor may do it right, but
 488  * usually is written in a nowhere standardized "multi-partition" manner.
 489  * Multisession uses absolute addressing (solely the first frame of the whole
 490  * track is #0), multi-partition uses relative addressing (each first frame of
 491  * each track is #0), and a track is not a session.
 492  *
 493  * A broken CDwriter software or drive firmware does not set new standards,
 494  * at least not if conflicting with the existing ones.
 495  *
 496  * emoenke@gwdg.de
 497  */
 498 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
 499
 500 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
 501 {
 502         struct cdrom_multisession ms_info;
 503         unsigned int vol_desc_start;
 504         struct block_device *bdev = sb->s_bdev;
 505         int i;
 506
 507         vol_desc_start=0;
 508         ms_info.addr_format=CDROM_LBA;
 509         if(session >= 0 && session <= 99) {
 510                 struct cdrom_tocentry Te;
 511                 Te.cdte_track=session;
 512                 Te.cdte_format=CDROM_LBA;
 513                 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
 514                 if (!i) {
 515                         printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
 516                                 session, Te.cdte_addr.lba,
 517                                 Te.cdte_ctrl&CDROM_DATA_TRACK);
 518                         if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
 519                                 return Te.cdte_addr.lba;
 520                 }
 521
 522                 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
 523         }
 524         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
 525         if (session > 0)
 526                 printk(KERN_ERR "ISOFS: Invalid session number\n");
 527 #if 0
 528         printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
 529         if (i==0) {
 530                 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
 531                 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
 532         }
 533 #endif
 534         if (i==0)
 535 #if WE_OBEY_THE_WRITTEN_STANDARDS
 536                 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
 537 #endif
 538                         vol_desc_start=ms_info.addr.lba;
 539         return vol_desc_start;
 540 }
 541
 542 /*
 543  * Initialize the superblock and read the root inode.
 544  *
 545  * Note: a check_disk_change() has been done immediately prior
 546  * to this call, so we don't need to check again.
 547  */
 548 static int isofs_fill_super(struct super_block *s, void *data, int silent)
 549 {
 550         struct buffer_head *bh = NULL, *pri_bh = NULL;
 551         struct hs_primary_descriptor *h_pri = NULL;
 552         struct iso_primary_descriptor *pri = NULL;
 553         struct iso_supplementary_descriptor *sec = NULL;
 554         struct iso_directory_record *rootp;
 555         struct inode *inode;
 556         struct iso9660_options opt;
 557         struct isofs_sb_info *sbi;
 558         unsigned long first_data_zone;
 559         int joliet_level = 0;
 560         int iso_blknum, block;
 561         int orig_zonesize;
 562         int table, error = -EINVAL;
 563         unsigned int vol_desc_start;
 564
 565         save_mount_options(s, data);
 566
 567         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 568         if (!sbi)
 569                 return -ENOMEM;
 570         s->s_fs_info = sbi;
 571
 572         if (!parse_options((char *)data, &opt))
 573                 goto out_freesbi;
 574
 575         /*
 576          * First of all, get the hardware blocksize for this device.
 577          * If we don't know what it is, or the hardware blocksize is
 578          * larger than the blocksize the user specified, then use
 579          * that value.
 580          */
 581         /*
 582          * What if bugger tells us to go beyond page size?
 583          */
 584         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
 585
 586         sbi->s_high_sierra = 0; /* default is iso9660 */
 587
 588         vol_desc_start = (opt.sbsector != -1) ?
 589                 opt.sbsector : isofs_get_last_session(s,opt.session);
 590
 591         for (iso_blknum = vol_desc_start+16;
 592                 iso_blknum < vol_desc_start+100; iso_blknum++) {
 593                 struct hs_volume_descriptor *hdp;
 594                 struct iso_volume_descriptor  *vdp;
 595
 596                 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
 597                 if (!(bh = sb_bread(s, block)))
 598                         goto out_no_read;
 599
 600                 vdp = (struct iso_volume_descriptor *)bh->b_data;
 601                 hdp = (struct hs_volume_descriptor *)bh->b_data;
 602
 603                 /*
 604                  * Due to the overlapping physical location of the descriptors,
 605                  * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
 606                  * proper identification in this case, we first check for ISO.
 607                  */
 608                 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
 609                         if (isonum_711(vdp->type) == ISO_VD_END)
 610                                 break;
 611                         if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
 612                                 if (pri == NULL) {
 613                                         pri = (struct iso_primary_descriptor *)vdp;
 614                                         /* Save the buffer in case we need it ... */
 615                                         pri_bh = bh;
 616                                         bh = NULL;
 617                                 }
 618                         }
 619 #ifdef CONFIG_JOLIET
 620                         else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
 621                                 sec = (struct iso_supplementary_descriptor *)vdp;
 622                                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
 623                                         if (opt.joliet == 'y') {
 624                                                 if (sec->escape[2] == 0x40)
 625                                                         joliet_level = 1;
 626                                                 else if (sec->escape[2] == 0x43)
 627                                                         joliet_level = 2;
 628                                                 else if (sec->escape[2] == 0x45)
 629                                                         joliet_level = 3;
 630
 631                                                 printk(KERN_DEBUG "ISO 9660 Extensions: "
 632                                                         "Microsoft Joliet Level %d\n",
 633                                                         joliet_level);
 634                                         }
 635                                         goto root_found;
 636                                 } else {
 637                                 /* Unknown supplementary volume descriptor */
 638                                 sec = NULL;
 639                                 }
 640                         }
 641 #endif
 642                 } else {
 643                         if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
 644                                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
 645                                         goto out_freebh;
 646
 647                                 sbi->s_high_sierra = 1;
 648                                 opt.rock = 'n';
 649                                 h_pri = (struct hs_primary_descriptor *)vdp;
 650                                 goto root_found;
 651                         }
 652                 }
 653
 654                 /* Just skip any volume descriptors we don't recognize */
 655
 656                 brelse(bh);
 657                 bh = NULL;
 658         }
 659         /*
 660          * If we fall through, either no volume descriptor was found,
 661          * or else we passed a primary descriptor looking for others.
 662          */
 663         if (!pri)
 664                 goto out_unknown_format;
 665         brelse(bh);
 666         bh = pri_bh;
 667         pri_bh = NULL;
 668
 669 root_found:
 670
 671         if (joliet_level && (pri == NULL || opt.rock == 'n')) {
 672                 /* This is the case of Joliet with the norock mount flag.
 673                  * A disc with both Joliet and Rock Ridge is handled later
 674                  */
 675                 pri = (struct iso_primary_descriptor *) sec;
 676         }
 677
 678         if(sbi->s_high_sierra){
 679                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
 680                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
 681                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
 682                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
 683         } else {
 684                 if (!pri)
 685                         goto out_freebh;
 686                 rootp = (struct iso_directory_record *) pri->root_directory_record;
 687                 sbi->s_nzones = isonum_733(pri->volume_space_size);
 688                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
 689                 sbi->s_max_size = isonum_733(pri->volume_space_size);
 690         }
 691
 692         sbi->s_ninodes = 0; /* No way to figure this out easily */
 693
 694         orig_zonesize = sbi->s_log_zone_size;
 695         /*
 696          * If the zone size is smaller than the hardware sector size,
 697          * this is a fatal error.  This would occur if the disc drive
 698          * had sectors that were 2048 bytes, but the filesystem had
 699          * blocks that were 512 bytes (which should only very rarely
 700          * happen.)
 701          */
 702         if (orig_zonesize < opt.blocksize)
 703                 goto out_bad_size;
 704
 705         /* RDE: convert log zone size to bit shift */
 706         switch (sbi->s_log_zone_size) {
 707         case  512: sbi->s_log_zone_size =  9; break;
 708         case 1024: sbi->s_log_zone_size = 10; break;
 709         case 2048: sbi->s_log_zone_size = 11; break;
 710
 711         default:
 712                 goto out_bad_zone_size;
 713         }
 714
 715         s->s_magic = ISOFS_SUPER_MAGIC;
 716         s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
 717
 718         /*
 719          * The CDROM is read-only, has no nodes (devices) on it, and since
 720          * all of the files appear to be owned by root, we really do not want
 721          * to allow suid.  (suid or devices will not show up unless we have
 722          * Rock Ridge extensions)
 723          */
 724
 725         s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
 726
 727         /* Set this for reference. Its not currently used except on write
 728            which we don't have .. */
 729
 730         first_data_zone = isonum_733(rootp->extent) +
 731                           isonum_711(rootp->ext_attr_length);
 732         sbi->s_firstdatazone = first_data_zone;
 733 #ifndef BEQUIET
 734         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
 735                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
 736         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
 737         if(sbi->s_high_sierra)
 738                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
 739 #endif
 740
 741         /*
 742          * If the Joliet level is set, we _may_ decide to use the
 743          * secondary descriptor, but can't be sure until after we
 744          * read the root inode. But before reading the root inode
 745          * we may need to change the device blocksize, and would
 746          * rather release the old buffer first. So, we cache the
 747          * first_data_zone value from the secondary descriptor.
 748          */
 749         if (joliet_level) {
 750                 pri = (struct iso_primary_descriptor *) sec;
 751                 rootp = (struct iso_directory_record *)
 752                         pri->root_directory_record;
 753                 first_data_zone = isonum_733(rootp->extent) +
 754                                 isonum_711(rootp->ext_attr_length);
 755         }
 756
 757         /*
 758          * We're all done using the volume descriptor, and may need
 759          * to change the device blocksize, so release the buffer now.
 760          */
 761         brelse(pri_bh);
 762         brelse(bh);
 763
 764         /*
 765          * Force the blocksize to 512 for 512 byte sectors.  The file
 766          * read primitives really get it wrong in a bad way if we don't
 767          * do this.
 768          *
 769          * Note - we should never be setting the blocksize to something
 770          * less than the hardware sector size for the device.  If we
 771          * do, we would end up having to read larger buffers and split
 772          * out portions to satisfy requests.
 773          *
 774          * Note2- the idea here is that we want to deal with the optimal
 775          * zonesize in the filesystem.  If we have it set to something less,
 776          * then we have horrible problems with trying to piece together
 777          * bits of adjacent blocks in order to properly read directory
 778          * entries.  By forcing the blocksize in this way, we ensure
 779          * that we will never be required to do this.
 780          */
 781         sb_set_blocksize(s, orig_zonesize);
 782
 783         sbi->s_nls_iocharset = NULL;
 784
 785 #ifdef CONFIG_JOLIET
 786         if (joliet_level && opt.utf8 == 0) {
 787                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
 788                 sbi->s_nls_iocharset = load_nls(p);
 789                 if (! sbi->s_nls_iocharset) {
 790                         /* Fail only if explicit charset specified */
 791                         if (opt.iocharset)
 792                                 goto out_freesbi;
 793                         sbi->s_nls_iocharset = load_nls_default();
 794                 }
 795         }
 796 #endif
 797         s->s_op = &isofs_sops;
 798         s->s_export_op = &isofs_export_ops;
 799         sbi->s_mapping = opt.map;
 800         sbi->s_rock = (opt.rock == 'y' ? 2 : 0);
 801         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
 802         sbi->s_cruft = opt.cruft;
 803         sbi->s_hide = opt.hide;
 804         sbi->s_showassoc = opt.showassoc;
 805         sbi->s_uid = opt.uid;
 806         sbi->s_gid = opt.gid;
 807         sbi->s_utf8 = opt.utf8;
 808         sbi->s_nocompress = opt.nocompress;
 809         /*
 810          * It would be incredibly stupid to allow people to mark every file
 811          * on the disk as suid, so we merely allow them to set the default
 812          * permissions.
 813          */
 814         sbi->s_fmode = opt.fmode & 0777;
 815         sbi->s_dmode = opt.dmode & 0777;
 816
 817         /*
 818          * Read the root inode, which _may_ result in changing
 819          * the s_rock flag. Once we have the final s_rock value,
 820          * we then decide whether to use the Joliet descriptor.
 821          */
 822         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 823         if (IS_ERR(inode))
 824                 goto out_no_root;
 825
 826         /*
 827          * If this disk has both Rock Ridge and Joliet on it, then we
 828          * want to use Rock Ridge by default.  This can be overridden
 829          * by using the norock mount option.  There is still one other
 830          * possibility that is not taken into account: a Rock Ridge
 831          * CD with Unicode names.  Until someone sees such a beast, it
 832          * will not be supported.
 833          */
 834         if (sbi->s_rock == 1) {
 835                 joliet_level = 0;
 836         } else if (joliet_level) {
 837                 sbi->s_rock = 0;
 838                 if (sbi->s_firstdatazone != first_data_zone) {
 839                         sbi->s_firstdatazone = first_data_zone;
 840                         printk(KERN_DEBUG
 841                                 "ISOFS: changing to secondary root\n");
 842                         iput(inode);
 843                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 844                         if (IS_ERR(inode))
 845                                 goto out_no_root;
 846                 }
 847         }
 848
 849         if (opt.check == 'u') {
 850                 /* Only Joliet is case insensitive by default */
 851                 if (joliet_level)
 852                         opt.check = 'r';
 853                 else
 854                         opt.check = 's';
 855         }
 856         sbi->s_joliet_level = joliet_level;
 857
 858         /* Make sure the root inode is a directory */
 859         if (!S_ISDIR(inode->i_mode)) {
 860                 printk(KERN_WARNING
 861                         "isofs_fill_super: root inode is not a directory. "
 862                         "Corrupted media?\n");
 863                 goto out_iput;
 864         }
 865
 866         /* get the root dentry */
 867         s->s_root = d_alloc_root(inode);
 868         if (!(s->s_root))
 869                 goto out_no_root;
 870
 871         table = 0;
 872         if (joliet_level)
 873                 table += 2;
 874         if (opt.check == 'r')
 875                 table++;
 876         s->s_root->d_op = &isofs_dentry_ops[table];
 877
 878         kfree(opt.iocharset);
 879
 880         return 0;
 881
 882         /*
 883          * Display error messages and free resources.
 884          */
 885 out_iput:
 886         iput(inode);
 887         goto out_no_inode;
 888 out_no_root:
 889         error = PTR_ERR(inode);
 890         if (error != -ENOMEM)
 891                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
 892 out_no_inode:
 893 #ifdef CONFIG_JOLIET
 894         if (sbi->s_nls_iocharset)
 895                 unload_nls(sbi->s_nls_iocharset);
 896 #endif
 897         goto out_freesbi;
 898 out_no_read:
 899         printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
 900                 __func__, s->s_id, iso_blknum, block);
 901         goto out_freesbi;
 902 out_bad_zone_size:
 903         printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
 904                 sbi->s_log_zone_size);
 905         goto out_freebh;
 906 out_bad_size:
 907         printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
 908                 orig_zonesize, opt.blocksize);
 909         goto out_freebh;
 910 out_unknown_format:
 911         if (!silent)
 912                 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
 913
 914 out_freebh:
 915         brelse(bh);
 916 out_freesbi:
 917         kfree(opt.iocharset);
 918         kfree(sbi);
 919         s->s_fs_info = NULL;
 920         return error;
 921 }
 922
 923 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
 924 {
 925         struct super_block *sb = dentry->d_sb;
 926
 927         buf->f_type = ISOFS_SUPER_MAGIC;
 928         buf->f_bsize = sb->s_blocksize;
 929         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
 930                 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
 931         buf->f_bfree = 0;
 932         buf->f_bavail = 0;
 933         buf->f_files = ISOFS_SB(sb)->s_ninodes;
 934         buf->f_ffree = 0;
 935         buf->f_namelen = NAME_MAX;
 936         return 0;
 937 }
 938
 939 /*
 940  * Get a set of blocks; filling in buffer_heads if already allocated
 941  * or getblk() if they are not.  Returns the number of blocks inserted
 942  * (-ve == error.)
 943  */
 944 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
 945                      struct buffer_head **bh, unsigned long nblocks)
 946 {
 947         unsigned long b_off;
 948         unsigned offset, sect_size;
 949         unsigned int firstext;
 950         unsigned long nextblk, nextoff;
 951         long iblock = (long)iblock_s;
 952         int section, rv, error;
 953         struct iso_inode_info *ei = ISOFS_I(inode);
 954
 955         lock_kernel();
 956
 957         error = -EIO;
 958         rv = 0;
 959         if (iblock < 0 || iblock != iblock_s) {
 960                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
 961                 goto abort;
 962         }
 963
 964         b_off = iblock;
 965
 966         offset = 0;
 967         firstext = ei->i_first_extent;
 968         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
 969         nextblk = ei->i_next_section_block;
 970         nextoff = ei->i_next_section_offset;
 971         section = 0;
 972
 973         while (nblocks) {
 974                 /* If we are *way* beyond the end of the file, print a message.
 975                  * Access beyond the end of the file up to the next page boundary
 976                  * is normal, however because of the way the page cache works.
 977                  * In this case, we just return 0 so that we can properly fill
 978                  * the page with useless information without generating any
 979                  * I/O errors.
 980                  */
 981                 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
 982                         printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
 983                                 __func__, iblock, (unsigned long) inode->i_size);
 984                         goto abort;
 985                 }
 986
 987                 /* On the last section, nextblk == 0, section size is likely to
 988                  * exceed sect_size by a partial block, and access beyond the
 989                  * end of the file will reach beyond the section size, too.
 990                  */
 991                 while (nextblk && (b_off >= (offset + sect_size))) {
 992                         struct inode *ninode;
 993
 994                         offset += sect_size;
 995                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
 996                         if (IS_ERR(ninode)) {
 997                                 error = PTR_ERR(ninode);
 998                                 goto abort;
 999                         }
1000                         firstext  = ISOFS_I(ninode)->i_first_extent;
1001                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1002                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
1003                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1004                         iput(ninode);
1005
1006                         if (++section > 100) {
1007                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1008                                         " aborting...\n", __func__);
1009                                 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1010                                         "nextblk=%lu nextoff=%lu\n", __func__,
1011                                         iblock, firstext, (unsigned) sect_size,
1012                                         nextblk, nextoff);
1013                                 goto abort;
1014                         }
1015                 }
1016
1017                 if (*bh) {
1018                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1019                 } else {
1020                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1021                         if (!*bh)
1022                                 goto abort;
1023                 }
1024                 bh++;   /* Next buffer head */
1025                 b_off++;        /* Next buffer offset */
1026                 nblocks--;
1027                 rv++;
1028         }
1029
1030         error = 0;
1031 abort:
1032         unlock_kernel();
1033         return rv != 0 ? rv : error;
1034 }
1035
1036 /*
1037  * Used by the standard interfaces.
1038  */
1039 static int isofs_get_block(struct inode *inode, sector_t iblock,
1040                     struct buffer_head *bh_result, int create)
1041 {
1042         int ret;
1043
1044         if (create) {
1045                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1046                 return -EROFS;
1047         }
1048
1049         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1050         return ret < 0 ? ret : 0;
1051 }
1052
1053 static int isofs_bmap(struct inode *inode, sector_t block)
1054 {
1055         struct buffer_head dummy;
1056         int error;
1057
1058         dummy.b_state = 0;
1059         dummy.b_blocknr = -1000;
1060         error = isofs_get_block(inode, block, &dummy, 0);
1061         if (!error)
1062                 return dummy.b_blocknr;
1063         return 0;
1064 }
1065
1066 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1067 {
1068         sector_t blknr = isofs_bmap(inode, block);
1069         if (!blknr)
1070                 return NULL;
1071         return sb_bread(inode->i_sb, blknr);
1072 }
1073
1074 static int isofs_readpage(struct file *file, struct page *page)
1075 {
1076         return block_read_full_page(page,isofs_get_block);
1077 }
1078
1079 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1080 {
1081         return generic_block_bmap(mapping,block,isofs_get_block);
1082 }
1083
1084 static const struct address_space_operations isofs_aops = {
1085         .readpage = isofs_readpage,
1086         .sync_page = block_sync_page,
1087         .bmap = _isofs_bmap
1088 };
1089
1090 static inline void test_and_set_uid(uid_t *p, uid_t value)
1091 {
1092         if (value)
1093                 *p = value;
1094 }
1095
1096 static inline void test_and_set_gid(gid_t *p, gid_t value)
1097 {
1098         if (value)
1099                 *p = value;
1100 }
1101
1102 static int isofs_read_level3_size(struct inode *inode)
1103 {
1104         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1105         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1106         struct buffer_head *bh = NULL;
1107         unsigned long block, offset, block_saved, offset_saved;
1108         int i = 0;
1109         int more_entries = 0;
1110         struct iso_directory_record *tmpde = NULL;
1111         struct iso_inode_info *ei = ISOFS_I(inode);
1112
1113         inode->i_size = 0;
1114
1115         /* The first 16 blocks are reserved as the System Area.  Thus,
1116          * no inodes can appear in block 0.  We use this to flag that
1117          * this is the last section. */
1118         ei->i_next_section_block = 0;
1119         ei->i_next_section_offset = 0;
1120
1121         block = ei->i_iget5_block;
1122         offset = ei->i_iget5_offset;
1123
1124         do {
1125                 struct iso_directory_record *de;
1126                 unsigned int de_len;
1127
1128                 if (!bh) {
1129                         bh = sb_bread(inode->i_sb, block);
1130                         if (!bh)
1131                                 goto out_noread;
1132                 }
1133                 de = (struct iso_directory_record *) (bh->b_data + offset);
1134                 de_len = *(unsigned char *) de;
1135
1136                 if (de_len == 0) {
1137                         brelse(bh);
1138                         bh = NULL;
1139                         ++block;
1140                         offset = 0;
1141                         continue;
1142                 }
1143
1144                 block_saved = block;
1145                 offset_saved = offset;
1146                 offset += de_len;
1147
1148                 /* Make sure we have a full directory entry */
1149                 if (offset >= bufsize) {
1150                         int slop = bufsize - offset + de_len;
1151                         if (!tmpde) {
1152                                 tmpde = kmalloc(256, GFP_KERNEL);
1153                                 if (!tmpde)
1154                                         goto out_nomem;
1155                         }
1156                         memcpy(tmpde, de, slop);
1157                         offset &= bufsize - 1;
1158                         block++;
1159                         brelse(bh);
1160                         bh = NULL;
1161                         if (offset) {
1162                                 bh = sb_bread(inode->i_sb, block);
1163                                 if (!bh)
1164                                         goto out_noread;
1165                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1166                         }
1167                         de = tmpde;
1168                 }
1169
1170                 inode->i_size += isonum_733(de->size);
1171                 if (i == 1) {
1172                         ei->i_next_section_block = block_saved;
1173                         ei->i_next_section_offset = offset_saved;
1174                 }
1175
1176                 more_entries = de->flags[-high_sierra] & 0x80;
1177
1178                 i++;
1179                 if (i > 100)
1180                         goto out_toomany;
1181         } while (more_entries);
1182 out:
1183         kfree(tmpde);
1184         if (bh)
1185                 brelse(bh);
1186         return 0;
1187
1188 out_nomem:
1189         if (bh)
1190                 brelse(bh);
1191         return -ENOMEM;
1192
1193 out_noread:
1194         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1195         kfree(tmpde);
1196         return -EIO;
1197
1198 out_toomany:
1199         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1200                 "isofs_read_level3_size: inode=%lu\n",
1201                 __func__, inode->i_ino);
1202         goto out;
1203 }
1204
1205 static int isofs_read_inode(struct inode *inode)
1206 {
1207         struct super_block *sb = inode->i_sb;
1208         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1209         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1210         unsigned long block;
1211         int high_sierra = sbi->s_high_sierra;
1212         struct buffer_head *bh = NULL;
1213         struct iso_directory_record *de;
1214         struct iso_directory_record *tmpde = NULL;
1215         unsigned int de_len;
1216         unsigned long offset;
1217         struct iso_inode_info *ei = ISOFS_I(inode);
1218         int ret = -EIO;
1219
1220         block = ei->i_iget5_block;
1221         bh = sb_bread(inode->i_sb, block);
1222         if (!bh)
1223                 goto out_badread;
1224
1225         offset = ei->i_iget5_offset;
1226
1227         de = (struct iso_directory_record *) (bh->b_data + offset);
1228         de_len = *(unsigned char *) de;
1229
1230         if (offset + de_len > bufsize) {
1231                 int frag1 = bufsize - offset;
1232
1233                 tmpde = kmalloc(de_len, GFP_KERNEL);
1234                 if (tmpde == NULL) {
1235                         printk(KERN_INFO "%s: out of memory\n", __func__);
1236                         ret = -ENOMEM;
1237                         goto fail;
1238                 }
1239                 memcpy(tmpde, bh->b_data + offset, frag1);
1240                 brelse(bh);
1241                 bh = sb_bread(inode->i_sb, ++block);
1242                 if (!bh)
1243                         goto out_badread;
1244                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1245                 de = tmpde;
1246         }
1247
1248         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1249                                         ei->i_iget5_offset,
1250                                         ISOFS_BUFFER_BITS(inode));
1251
1252         /* Assume it is a normal-format file unless told otherwise */
1253         ei->i_file_format = isofs_file_normal;
1254
1255         if (de->flags[-high_sierra] & 2) {
1256                 inode->i_mode = sbi->s_dmode | S_IFDIR;
1257                 inode->i_nlink = 1;     /*
1258                                          * Set to 1.  We know there are 2, but
1259                                          * the find utility tries to optimize
1260                                          * if it is 2, and it screws up.  It is
1261                                          * easier to give 1 which tells find to
1262                                          * do it the hard way.
1263                                          */
1264         } else {
1265                 /* Everybody gets to read the file. */
1266                 inode->i_mode = sbi->s_fmode | S_IFREG;
1267                 inode->i_nlink = 1;
1268         }
1269         inode->i_uid = sbi->s_uid;
1270         inode->i_gid = sbi->s_gid;
1271         inode->i_blocks = 0;
1272
1273         ei->i_format_parm[0] = 0;
1274         ei->i_format_parm[1] = 0;
1275         ei->i_format_parm[2] = 0;
1276
1277         ei->i_section_size = isonum_733(de->size);
1278         if (de->flags[-high_sierra] & 0x80) {
1279                 ret = isofs_read_level3_size(inode);
1280                 if (ret < 0)
1281                         goto fail;
1282                 ret = -EIO;
1283         } else {
1284                 ei->i_next_section_block = 0;
1285                 ei->i_next_section_offset = 0;
1286                 inode->i_size = isonum_733(de->size);
1287         }
1288
1289         /*
1290          * Some dipshit decided to store some other bit of information
1291          * in the high byte of the file length.  Truncate size in case
1292          * this CDROM was mounted with the cruft option.
1293          */
1294
1295         if (sbi->s_cruft == 'y')
1296                 inode->i_size &= 0x00ffffff;
1297
1298         if (de->interleave[0]) {
1299                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1300                 inode->i_size = 0;
1301         }
1302
1303         /* I have no idea what file_unit_size is used for, so
1304            we will flag it for now */
1305         if (de->file_unit_size[0] != 0) {
1306                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1307                         inode->i_ino);
1308         }
1309
1310         /* I have no idea what other flag bits are used for, so
1311            we will flag it for now */
1312 #ifdef DEBUG
1313         if((de->flags[-high_sierra] & ~2)!= 0){
1314                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1315                                 "(%ld %x).\n",
1316                         inode->i_ino, de->flags[-high_sierra]);
1317         }
1318 #endif
1319
1320         inode->i_mtime.tv_sec =
1321         inode->i_atime.tv_sec =
1322         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1323         inode->i_mtime.tv_nsec =
1324         inode->i_atime.tv_nsec =
1325         inode->i_ctime.tv_nsec = 0;
1326
1327         ei->i_first_extent = (isonum_733(de->extent) +
1328                         isonum_711(de->ext_attr_length));
1329
1330         /* Set the number of blocks for stat() - should be done before RR */
1331         inode->i_blocks = (inode->i_size + 511) >> 9;
1332
1333         /*
1334          * Now test for possible Rock Ridge extensions which will override
1335          * some of these numbers in the inode structure.
1336          */
1337
1338         if (!high_sierra) {
1339                 parse_rock_ridge_inode(de, inode);
1340                 /* if we want uid/gid set, override the rock ridge setting */
1341                 test_and_set_uid(&inode->i_uid, sbi->s_uid);
1342                 test_and_set_gid(&inode->i_gid, sbi->s_gid);
1343         }
1344
1345         /* Install the inode operations vector */
1346         if (S_ISREG(inode->i_mode)) {
1347                 inode->i_fop = &generic_ro_fops;
1348                 switch (ei->i_file_format) {
1349 #ifdef CONFIG_ZISOFS
1350                 case isofs_file_compressed:
1351                         inode->i_data.a_ops = &zisofs_aops;
1352                         break;
1353 #endif
1354                 default:
1355                         inode->i_data.a_ops = &isofs_aops;
1356                         break;
1357                 }
1358         } else if (S_ISDIR(inode->i_mode)) {
1359                 inode->i_op = &isofs_dir_inode_operations;
1360                 inode->i_fop = &isofs_dir_operations;
1361         } else if (S_ISLNK(inode->i_mode)) {
1362                 inode->i_op = &page_symlink_inode_operations;
1363                 inode->i_data.a_ops = &isofs_symlink_aops;
1364         } else
1365                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1366                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1367
1368         ret = 0;
1369 out:
1370         kfree(tmpde);
1371         if (bh)
1372                 brelse(bh);
1373         return ret;
1374
1375 out_badread:
1376         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1377 fail:
1378         goto out;
1379 }
1380
1381 struct isofs_iget5_callback_data {
1382         unsigned long block;
1383         unsigned long offset;
1384 };
1385
1386 static int isofs_iget5_test(struct inode *ino, void *data)
1387 {
1388         struct iso_inode_info *i = ISOFS_I(ino);
1389         struct isofs_iget5_callback_data *d =
1390                 (struct isofs_iget5_callback_data*)data;
1391         return (i->i_iget5_block == d->block)
1392                 && (i->i_iget5_offset == d->offset);
1393 }
1394
1395 static int isofs_iget5_set(struct inode *ino, void *data)
1396 {
1397         struct iso_inode_info *i = ISOFS_I(ino);
1398         struct isofs_iget5_callback_data *d =
1399                 (struct isofs_iget5_callback_data*)data;
1400         i->i_iget5_block = d->block;
1401         i->i_iget5_offset = d->offset;
1402         return 0;
1403 }
1404
1405 /* Store, in the inode's containing structure, the block and block
1406  * offset that point to the underlying meta-data for the inode.  The
1407  * code below is otherwise similar to the iget() code in
1408  * include/linux/fs.h */
1409 struct inode *isofs_iget(struct super_block *sb,
1410                          unsigned long block,
1411                          unsigned long offset)
1412 {
1413         unsigned long hashval;
1414         struct inode *inode;
1415         struct isofs_iget5_callback_data data;
1416         long ret;
1417
1418         if (offset >= 1ul << sb->s_blocksize_bits)
1419                 return ERR_PTR(-EINVAL);
1420
1421         data.block = block;
1422         data.offset = offset;
1423
1424         hashval = (block << sb->s_blocksize_bits) | offset;
1425
1426         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1427                                 &isofs_iget5_set, &data);
1428
1429         if (!inode)
1430                 return ERR_PTR(-ENOMEM);
1431
1432         if (inode->i_state & I_NEW) {
1433                 ret = isofs_read_inode(inode);
1434                 if (ret < 0) {
1435                         iget_failed(inode);
1436                         inode = ERR_PTR(ret);
1437                 } else {
1438                         unlock_new_inode(inode);
1439                 }
1440         }
1441
1442         return inode;
1443 }
1444
1445 static int isofs_get_sb(struct file_system_type *fs_type,
1446         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1447 {
1448         return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1449                                 mnt);
1450 }
1451
1452 static struct file_system_type iso9660_fs_type = {
1453         .owner          = THIS_MODULE,
1454         .name           = "iso9660",
1455         .get_sb         = isofs_get_sb,
1456         .kill_sb        = kill_block_super,
1457         .fs_flags       = FS_REQUIRES_DEV,
1458 };
1459
1460 static int __init init_iso9660_fs(void)
1461 {
1462         int err = init_inodecache();
1463         if (err)
1464                 goto out;
1465 #ifdef CONFIG_ZISOFS
1466         err = zisofs_init();
1467         if (err)
1468                 goto out1;
1469 #endif
1470         err = register_filesystem(&iso9660_fs_type);
1471         if (err)
1472                 goto out2;
1473         return 0;
1474 out2:
1475 #ifdef CONFIG_ZISOFS
1476         zisofs_cleanup();
1477 out1:
1478 #endif
1479         destroy_inodecache();
1480 out:
1481         return err;
1482 }
1483
1484 static void __exit exit_iso9660_fs(void)
1485 {
1486         unregister_filesystem(&iso9660_fs_type);
1487 #ifdef CONFIG_ZISOFS
1488         zisofs_cleanup();
1489 #endif
1490         destroy_inodecache();
1491 }
1492
1493 module_init(init_iso9660_fs)
1494 module_exit(exit_iso9660_fs)
1495 MODULE_LICENSE("GPL");
1496 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1497 MODULE_ALIAS("iso9660");