fs/isofs/inode.c

   1 /*
   2  *  linux/fs/isofs/inode.c
   3  *
   4  *  (C) 1991  Linus Torvalds - minix filesystem
   5  *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
   6  *      1994  Eberhard Mönkeberg - multi session handling.
   7  *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
   8  *      1997  Gordon Chaffee - Joliet CDs
   9  *      1998  Eric Lammerts - ISO 9660 Level 3
  10  *      2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
  11  *      2004  Paul Serice - NFS Export Operations
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16
  17 #include <linux/slab.h>
  18 #include <linux/nls.h>
  19 #include <linux/ctype.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/statfs.h>
  22 #include <linux/cdrom.h>
  23 #include <linux/parser.h>
  24
  25 #include "isofs.h"
  26 #include "zisofs.h"
  27
  28 #define BEQUIET
  29
  30 static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
  31 static int isofs_hash(struct dentry *parent, struct qstr *qstr);
  32 static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
  33 static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
  34
  35 #ifdef CONFIG_JOLIET
  36 static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
  37 static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
  38 static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
  39 static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
  40 #endif
  41
  42 static void isofs_put_super(struct super_block *sb)
  43 {
  44         struct isofs_sb_info *sbi = ISOFS_SB(sb);
  45
  46 #ifdef CONFIG_JOLIET
  47         lock_kernel();
  48
  49         unload_nls(sbi->s_nls_iocharset);
  50
  51         unlock_kernel();
  52 #endif
  53
  54         kfree(sbi);
  55         sb->s_fs_info = NULL;
  56         return;
  57 }
  58
  59 static int isofs_read_inode(struct inode *);
  60 static int isofs_statfs (struct dentry *, struct kstatfs *);
  61
  62 static struct kmem_cache *isofs_inode_cachep;
  63
  64 static struct inode *isofs_alloc_inode(struct super_block *sb)
  65 {
  66         struct iso_inode_info *ei;
  67         ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
  68         if (!ei)
  69                 return NULL;
  70         return &ei->vfs_inode;
  71 }
  72
  73 static void isofs_destroy_inode(struct inode *inode)
  74 {
  75         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
  76 }
  77
  78 static void init_once(void *foo)
  79 {
  80         struct iso_inode_info *ei = foo;
  81
  82         inode_init_once(&ei->vfs_inode);
  83 }
  84
  85 static int init_inodecache(void)
  86 {
  87         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
  88                                         sizeof(struct iso_inode_info),
  89                                         0, (SLAB_RECLAIM_ACCOUNT|
  90                                         SLAB_MEM_SPREAD),
  91                                         init_once);
  92         if (isofs_inode_cachep == NULL)
  93                 return -ENOMEM;
  94         return 0;
  95 }
  96
  97 static void destroy_inodecache(void)
  98 {
  99         kmem_cache_destroy(isofs_inode_cachep);
 100 }
 101
 102 static int isofs_remount(struct super_block *sb, int *flags, char *data)
 103 {
 104         /* we probably want a lot more here */
 105         *flags |= MS_RDONLY;
 106         return 0;
 107 }
 108
 109 static const struct super_operations isofs_sops = {
 110         .alloc_inode    = isofs_alloc_inode,
 111         .destroy_inode  = isofs_destroy_inode,
 112         .put_super      = isofs_put_super,
 113         .statfs         = isofs_statfs,
 114         .remount_fs     = isofs_remount,
 115         .show_options   = generic_show_options,
 116 };
 117
 118
 119 static const struct dentry_operations isofs_dentry_ops[] = {
 120         {
 121                 .d_hash         = isofs_hash,
 122                 .d_compare      = isofs_dentry_cmp,
 123         },
 124         {
 125                 .d_hash         = isofs_hashi,
 126                 .d_compare      = isofs_dentry_cmpi,
 127         },
 128 #ifdef CONFIG_JOLIET
 129         {
 130                 .d_hash         = isofs_hash_ms,
 131                 .d_compare      = isofs_dentry_cmp_ms,
 132         },
 133         {
 134                 .d_hash         = isofs_hashi_ms,
 135                 .d_compare      = isofs_dentry_cmpi_ms,
 136         },
 137 #endif
 138 };
 139
 140 struct iso9660_options{
 141         unsigned int rock:1;
 142         unsigned int joliet:1;
 143         unsigned int cruft:1;
 144         unsigned int hide:1;
 145         unsigned int showassoc:1;
 146         unsigned int nocompress:1;
 147         unsigned int overriderockperm:1;
 148         unsigned int uid_set:1;
 149         unsigned int gid_set:1;
 150         unsigned int utf8:1;
 151         unsigned char map;
 152         unsigned char check;
 153         unsigned int blocksize;
 154         mode_t fmode;
 155         mode_t dmode;
 156         gid_t gid;
 157         uid_t uid;
 158         char *iocharset;
 159         /* LVE */
 160         s32 session;
 161         s32 sbsector;
 162 };
 163
 164 /*
 165  * Compute the hash for the isofs name corresponding to the dentry.
 166  */
 167 static int
 168 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
 169 {
 170         const char *name;
 171         int len;
 172
 173         len = qstr->len;
 174         name = qstr->name;
 175         if (ms) {
 176                 while (len && name[len-1] == '.')
 177                         len--;
 178         }
 179
 180         qstr->hash = full_name_hash(name, len);
 181
 182         return 0;
 183 }
 184
 185 /*
 186  * Compute the hash for the isofs name corresponding to the dentry.
 187  */
 188 static int
 189 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
 190 {
 191         const char *name;
 192         int len;
 193         char c;
 194         unsigned long hash;
 195
 196         len = qstr->len;
 197         name = qstr->name;
 198         if (ms) {
 199                 while (len && name[len-1] == '.')
 200                         len--;
 201         }
 202
 203         hash = init_name_hash();
 204         while (len--) {
 205                 c = tolower(*name++);
 206                 hash = partial_name_hash(c, hash);
 207         }
 208         qstr->hash = end_name_hash(hash);
 209
 210         return 0;
 211 }
 212
 213 /*
 214  * Case insensitive compare of two isofs names.
 215  */
 216 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
 217                                 struct qstr *b, int ms)
 218 {
 219         int alen, blen;
 220
 221         /* A filename cannot end in '.' or we treat it like it has none */
 222         alen = a->len;
 223         blen = b->len;
 224         if (ms) {
 225                 while (alen && a->name[alen-1] == '.')
 226                         alen--;
 227                 while (blen && b->name[blen-1] == '.')
 228                         blen--;
 229         }
 230         if (alen == blen) {
 231                 if (strnicmp(a->name, b->name, alen) == 0)
 232                         return 0;
 233         }
 234         return 1;
 235 }
 236
 237 /*
 238  * Case sensitive compare of two isofs names.
 239  */
 240 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
 241                                         struct qstr *b, int ms)
 242 {
 243         int alen, blen;
 244
 245         /* A filename cannot end in '.' or we treat it like it has none */
 246         alen = a->len;
 247         blen = b->len;
 248         if (ms) {
 249                 while (alen && a->name[alen-1] == '.')
 250                         alen--;
 251                 while (blen && b->name[blen-1] == '.')
 252                         blen--;
 253         }
 254         if (alen == blen) {
 255                 if (strncmp(a->name, b->name, alen) == 0)
 256                         return 0;
 257         }
 258         return 1;
 259 }
 260
 261 static int
 262 isofs_hash(struct dentry *dentry, struct qstr *qstr)
 263 {
 264         return isofs_hash_common(dentry, qstr, 0);
 265 }
 266
 267 static int
 268 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
 269 {
 270         return isofs_hashi_common(dentry, qstr, 0);
 271 }
 272
 273 static int
 274 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
 275 {
 276         return isofs_dentry_cmp_common(dentry, a, b, 0);
 277 }
 278
 279 static int
 280 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
 281 {
 282         return isofs_dentry_cmpi_common(dentry, a, b, 0);
 283 }
 284
 285 #ifdef CONFIG_JOLIET
 286 static int
 287 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
 288 {
 289         return isofs_hash_common(dentry, qstr, 1);
 290 }
 291
 292 static int
 293 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
 294 {
 295         return isofs_hashi_common(dentry, qstr, 1);
 296 }
 297
 298 static int
 299 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
 300 {
 301         return isofs_dentry_cmp_common(dentry, a, b, 1);
 302 }
 303
 304 static int
 305 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
 306 {
 307         return isofs_dentry_cmpi_common(dentry, a, b, 1);
 308 }
 309 #endif
 310
 311 enum {
 312         Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
 313         Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
 314         Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
 315         Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
 316 };
 317
 318 static const match_table_t tokens = {
 319         {Opt_norock, "norock"},
 320         {Opt_nojoliet, "nojoliet"},
 321         {Opt_unhide, "unhide"},
 322         {Opt_hide, "hide"},
 323         {Opt_showassoc, "showassoc"},
 324         {Opt_cruft, "cruft"},
 325         {Opt_utf8, "utf8"},
 326         {Opt_iocharset, "iocharset=%s"},
 327         {Opt_map_a, "map=acorn"},
 328         {Opt_map_a, "map=a"},
 329         {Opt_map_n, "map=normal"},
 330         {Opt_map_n, "map=n"},
 331         {Opt_map_o, "map=off"},
 332         {Opt_map_o, "map=o"},
 333         {Opt_session, "session=%u"},
 334         {Opt_sb, "sbsector=%u"},
 335         {Opt_check_r, "check=relaxed"},
 336         {Opt_check_r, "check=r"},
 337         {Opt_check_s, "check=strict"},
 338         {Opt_check_s, "check=s"},
 339         {Opt_uid, "uid=%u"},
 340         {Opt_gid, "gid=%u"},
 341         {Opt_mode, "mode=%u"},
 342         {Opt_dmode, "dmode=%u"},
 343         {Opt_overriderockperm, "overriderockperm"},
 344         {Opt_block, "block=%u"},
 345         {Opt_ignore, "conv=binary"},
 346         {Opt_ignore, "conv=b"},
 347         {Opt_ignore, "conv=text"},
 348         {Opt_ignore, "conv=t"},
 349         {Opt_ignore, "conv=mtext"},
 350         {Opt_ignore, "conv=m"},
 351         {Opt_ignore, "conv=auto"},
 352         {Opt_ignore, "conv=a"},
 353         {Opt_nocompress, "nocompress"},
 354         {Opt_err, NULL}
 355 };
 356
 357 static int parse_options(char *options, struct iso9660_options *popt)
 358 {
 359         char *p;
 360         int option;
 361
 362         popt->map = 'n';
 363         popt->rock = 1;
 364         popt->joliet = 1;
 365         popt->cruft = 0;
 366         popt->hide = 0;
 367         popt->showassoc = 0;
 368         popt->check = 'u';              /* unset */
 369         popt->nocompress = 0;
 370         popt->blocksize = 1024;
 371         popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
 372         popt->uid_set = 0;
 373         popt->gid_set = 0;
 374         popt->gid = 0;
 375         popt->uid = 0;
 376         popt->iocharset = NULL;
 377         popt->utf8 = 0;
 378         popt->overriderockperm = 0;
 379         popt->session=-1;
 380         popt->sbsector=-1;
 381         if (!options)
 382                 return 1;
 383
 384         while ((p = strsep(&options, ",")) != NULL) {
 385                 int token;
 386                 substring_t args[MAX_OPT_ARGS];
 387                 unsigned n;
 388
 389                 if (!*p)
 390                         continue;
 391
 392                 token = match_token(p, tokens, args);
 393                 switch (token) {
 394                 case Opt_norock:
 395                         popt->rock = 0;
 396                         break;
 397                 case Opt_nojoliet:
 398                         popt->joliet = 0;
 399                         break;
 400                 case Opt_hide:
 401                         popt->hide = 1;
 402                         break;
 403                 case Opt_unhide:
 404                 case Opt_showassoc:
 405                         popt->showassoc = 1;
 406                         break;
 407                 case Opt_cruft:
 408                         popt->cruft = 1;
 409                         break;
 410                 case Opt_utf8:
 411                         popt->utf8 = 1;
 412                         break;
 413 #ifdef CONFIG_JOLIET
 414                 case Opt_iocharset:
 415                         popt->iocharset = match_strdup(&args[0]);
 416                         break;
 417 #endif
 418                 case Opt_map_a:
 419                         popt->map = 'a';
 420                         break;
 421                 case Opt_map_o:
 422                         popt->map = 'o';
 423                         break;
 424                 case Opt_map_n:
 425                         popt->map = 'n';
 426                         break;
 427                 case Opt_session:
 428                         if (match_int(&args[0], &option))
 429                                 return 0;
 430                         n = option;
 431                         if (n > 99)
 432                                 return 0;
 433                         popt->session = n + 1;
 434                         break;
 435                 case Opt_sb:
 436                         if (match_int(&args[0], &option))
 437                                 return 0;
 438                         popt->sbsector = option;
 439                         break;
 440                 case Opt_check_r:
 441                         popt->check = 'r';
 442                         break;
 443                 case Opt_check_s:
 444                         popt->check = 's';
 445                         break;
 446                 case Opt_ignore:
 447                         break;
 448                 case Opt_uid:
 449                         if (match_int(&args[0], &option))
 450                                 return 0;
 451                         popt->uid = option;
 452                         popt->uid_set = 1;
 453                         break;
 454                 case Opt_gid:
 455                         if (match_int(&args[0], &option))
 456                                 return 0;
 457                         popt->gid = option;
 458                         popt->gid_set = 1;
 459                         break;
 460                 case Opt_mode:
 461                         if (match_int(&args[0], &option))
 462                                 return 0;
 463                         popt->fmode = option;
 464                         break;
 465                 case Opt_dmode:
 466                         if (match_int(&args[0], &option))
 467                                 return 0;
 468                         popt->dmode = option;
 469                         break;
 470                 case Opt_overriderockperm:
 471                         popt->overriderockperm = 1;
 472                         break;
 473                 case Opt_block:
 474                         if (match_int(&args[0], &option))
 475                                 return 0;
 476                         n = option;
 477                         if (n != 512 && n != 1024 && n != 2048)
 478                                 return 0;
 479                         popt->blocksize = n;
 480                         break;
 481                 case Opt_nocompress:
 482                         popt->nocompress = 1;
 483                         break;
 484                 default:
 485                         return 0;
 486                 }
 487         }
 488         return 1;
 489 }
 490
 491 /*
 492  * look if the driver can tell the multi session redirection value
 493  *
 494  * don't change this if you don't know what you do, please!
 495  * Multisession is legal only with XA disks.
 496  * A non-XA disk with more than one volume descriptor may do it right, but
 497  * usually is written in a nowhere standardized "multi-partition" manner.
 498  * Multisession uses absolute addressing (solely the first frame of the whole
 499  * track is #0), multi-partition uses relative addressing (each first frame of
 500  * each track is #0), and a track is not a session.
 501  *
 502  * A broken CDwriter software or drive firmware does not set new standards,
 503  * at least not if conflicting with the existing ones.
 504  *
 505  * emoenke@gwdg.de
 506  */
 507 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
 508
 509 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
 510 {
 511         struct cdrom_multisession ms_info;
 512         unsigned int vol_desc_start;
 513         struct block_device *bdev = sb->s_bdev;
 514         int i;
 515
 516         vol_desc_start=0;
 517         ms_info.addr_format=CDROM_LBA;
 518         if(session >= 0 && session <= 99) {
 519                 struct cdrom_tocentry Te;
 520                 Te.cdte_track=session;
 521                 Te.cdte_format=CDROM_LBA;
 522                 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
 523                 if (!i) {
 524                         printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
 525                                 session, Te.cdte_addr.lba,
 526                                 Te.cdte_ctrl&CDROM_DATA_TRACK);
 527                         if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
 528                                 return Te.cdte_addr.lba;
 529                 }
 530
 531                 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
 532         }
 533         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
 534         if (session > 0)
 535                 printk(KERN_ERR "ISOFS: Invalid session number\n");
 536 #if 0
 537         printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
 538         if (i==0) {
 539                 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
 540                 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
 541         }
 542 #endif
 543         if (i==0)
 544 #if WE_OBEY_THE_WRITTEN_STANDARDS
 545                 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
 546 #endif
 547                         vol_desc_start=ms_info.addr.lba;
 548         return vol_desc_start;
 549 }
 550
 551 /*
 552  * Initialize the superblock and read the root inode.
 553  *
 554  * Note: a check_disk_change() has been done immediately prior
 555  * to this call, so we don't need to check again.
 556  */
 557 static int isofs_fill_super(struct super_block *s, void *data, int silent)
 558 {
 559         struct buffer_head *bh = NULL, *pri_bh = NULL;
 560         struct hs_primary_descriptor *h_pri = NULL;
 561         struct iso_primary_descriptor *pri = NULL;
 562         struct iso_supplementary_descriptor *sec = NULL;
 563         struct iso_directory_record *rootp;
 564         struct inode *inode;
 565         struct iso9660_options opt;
 566         struct isofs_sb_info *sbi;
 567         unsigned long first_data_zone;
 568         int joliet_level = 0;
 569         int iso_blknum, block;
 570         int orig_zonesize;
 571         int table, error = -EINVAL;
 572         unsigned int vol_desc_start;
 573
 574         save_mount_options(s, data);
 575
 576         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 577         if (!sbi)
 578                 return -ENOMEM;
 579         s->s_fs_info = sbi;
 580
 581         if (!parse_options((char *)data, &opt))
 582                 goto out_freesbi;
 583
 584         /*
 585          * First of all, get the hardware blocksize for this device.
 586          * If we don't know what it is, or the hardware blocksize is
 587          * larger than the blocksize the user specified, then use
 588          * that value.
 589          */
 590         /*
 591          * What if bugger tells us to go beyond page size?
 592          */
 593         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
 594
 595         sbi->s_high_sierra = 0; /* default is iso9660 */
 596
 597         vol_desc_start = (opt.sbsector != -1) ?
 598                 opt.sbsector : isofs_get_last_session(s,opt.session);
 599
 600         for (iso_blknum = vol_desc_start+16;
 601                 iso_blknum < vol_desc_start+100; iso_blknum++) {
 602                 struct hs_volume_descriptor *hdp;
 603                 struct iso_volume_descriptor  *vdp;
 604
 605                 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
 606                 if (!(bh = sb_bread(s, block)))
 607                         goto out_no_read;
 608
 609                 vdp = (struct iso_volume_descriptor *)bh->b_data;
 610                 hdp = (struct hs_volume_descriptor *)bh->b_data;
 611
 612                 /*
 613                  * Due to the overlapping physical location of the descriptors,
 614                  * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
 615                  * proper identification in this case, we first check for ISO.
 616                  */
 617                 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
 618                         if (isonum_711(vdp->type) == ISO_VD_END)
 619                                 break;
 620                         if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
 621                                 if (pri == NULL) {
 622                                         pri = (struct iso_primary_descriptor *)vdp;
 623                                         /* Save the buffer in case we need it ... */
 624                                         pri_bh = bh;
 625                                         bh = NULL;
 626                                 }
 627                         }
 628 #ifdef CONFIG_JOLIET
 629                         else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
 630                                 sec = (struct iso_supplementary_descriptor *)vdp;
 631                                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
 632                                         if (opt.joliet) {
 633                                                 if (sec->escape[2] == 0x40)
 634                                                         joliet_level = 1;
 635                                                 else if (sec->escape[2] == 0x43)
 636                                                         joliet_level = 2;
 637                                                 else if (sec->escape[2] == 0x45)
 638                                                         joliet_level = 3;
 639
 640                                                 printk(KERN_DEBUG "ISO 9660 Extensions: "
 641                                                         "Microsoft Joliet Level %d\n",
 642                                                         joliet_level);
 643                                         }
 644                                         goto root_found;
 645                                 } else {
 646                                 /* Unknown supplementary volume descriptor */
 647                                 sec = NULL;
 648                                 }
 649                         }
 650 #endif
 651                 } else {
 652                         if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
 653                                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
 654                                         goto out_freebh;
 655
 656                                 sbi->s_high_sierra = 1;
 657                                 opt.rock = 0;
 658                                 h_pri = (struct hs_primary_descriptor *)vdp;
 659                                 goto root_found;
 660                         }
 661                 }
 662
 663                 /* Just skip any volume descriptors we don't recognize */
 664
 665                 brelse(bh);
 666                 bh = NULL;
 667         }
 668         /*
 669          * If we fall through, either no volume descriptor was found,
 670          * or else we passed a primary descriptor looking for others.
 671          */
 672         if (!pri)
 673                 goto out_unknown_format;
 674         brelse(bh);
 675         bh = pri_bh;
 676         pri_bh = NULL;
 677
 678 root_found:
 679
 680         if (joliet_level && (pri == NULL || !opt.rock)) {
 681                 /* This is the case of Joliet with the norock mount flag.
 682                  * A disc with both Joliet and Rock Ridge is handled later
 683                  */
 684                 pri = (struct iso_primary_descriptor *) sec;
 685         }
 686
 687         if(sbi->s_high_sierra){
 688                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
 689                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
 690                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
 691                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
 692         } else {
 693                 if (!pri)
 694                         goto out_freebh;
 695                 rootp = (struct iso_directory_record *) pri->root_directory_record;
 696                 sbi->s_nzones = isonum_733(pri->volume_space_size);
 697                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
 698                 sbi->s_max_size = isonum_733(pri->volume_space_size);
 699         }
 700
 701         sbi->s_ninodes = 0; /* No way to figure this out easily */
 702
 703         orig_zonesize = sbi->s_log_zone_size;
 704         /*
 705          * If the zone size is smaller than the hardware sector size,
 706          * this is a fatal error.  This would occur if the disc drive
 707          * had sectors that were 2048 bytes, but the filesystem had
 708          * blocks that were 512 bytes (which should only very rarely
 709          * happen.)
 710          */
 711         if (orig_zonesize < opt.blocksize)
 712                 goto out_bad_size;
 713
 714         /* RDE: convert log zone size to bit shift */
 715         switch (sbi->s_log_zone_size) {
 716         case  512: sbi->s_log_zone_size =  9; break;
 717         case 1024: sbi->s_log_zone_size = 10; break;
 718         case 2048: sbi->s_log_zone_size = 11; break;
 719
 720         default:
 721                 goto out_bad_zone_size;
 722         }
 723
 724         s->s_magic = ISOFS_SUPER_MAGIC;
 725         s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
 726
 727         /*
 728          * The CDROM is read-only, has no nodes (devices) on it, and since
 729          * all of the files appear to be owned by root, we really do not want
 730          * to allow suid.  (suid or devices will not show up unless we have
 731          * Rock Ridge extensions)
 732          */
 733
 734         s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
 735
 736         /* Set this for reference. Its not currently used except on write
 737            which we don't have .. */
 738
 739         first_data_zone = isonum_733(rootp->extent) +
 740                           isonum_711(rootp->ext_attr_length);
 741         sbi->s_firstdatazone = first_data_zone;
 742 #ifndef BEQUIET
 743         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
 744                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
 745         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
 746         if(sbi->s_high_sierra)
 747                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
 748 #endif
 749
 750         /*
 751          * If the Joliet level is set, we _may_ decide to use the
 752          * secondary descriptor, but can't be sure until after we
 753          * read the root inode. But before reading the root inode
 754          * we may need to change the device blocksize, and would
 755          * rather release the old buffer first. So, we cache the
 756          * first_data_zone value from the secondary descriptor.
 757          */
 758         if (joliet_level) {
 759                 pri = (struct iso_primary_descriptor *) sec;
 760                 rootp = (struct iso_directory_record *)
 761                         pri->root_directory_record;
 762                 first_data_zone = isonum_733(rootp->extent) +
 763                                 isonum_711(rootp->ext_attr_length);
 764         }
 765
 766         /*
 767          * We're all done using the volume descriptor, and may need
 768          * to change the device blocksize, so release the buffer now.
 769          */
 770         brelse(pri_bh);
 771         brelse(bh);
 772
 773         /*
 774          * Force the blocksize to 512 for 512 byte sectors.  The file
 775          * read primitives really get it wrong in a bad way if we don't
 776          * do this.
 777          *
 778          * Note - we should never be setting the blocksize to something
 779          * less than the hardware sector size for the device.  If we
 780          * do, we would end up having to read larger buffers and split
 781          * out portions to satisfy requests.
 782          *
 783          * Note2- the idea here is that we want to deal with the optimal
 784          * zonesize in the filesystem.  If we have it set to something less,
 785          * then we have horrible problems with trying to piece together
 786          * bits of adjacent blocks in order to properly read directory
 787          * entries.  By forcing the blocksize in this way, we ensure
 788          * that we will never be required to do this.
 789          */
 790         sb_set_blocksize(s, orig_zonesize);
 791
 792         sbi->s_nls_iocharset = NULL;
 793
 794 #ifdef CONFIG_JOLIET
 795         if (joliet_level && opt.utf8 == 0) {
 796                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
 797                 sbi->s_nls_iocharset = load_nls(p);
 798                 if (! sbi->s_nls_iocharset) {
 799                         /* Fail only if explicit charset specified */
 800                         if (opt.iocharset)
 801                                 goto out_freesbi;
 802                         sbi->s_nls_iocharset = load_nls_default();
 803                 }
 804         }
 805 #endif
 806         s->s_op = &isofs_sops;
 807         s->s_export_op = &isofs_export_ops;
 808         sbi->s_mapping = opt.map;
 809         sbi->s_rock = (opt.rock ? 2 : 0);
 810         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
 811         sbi->s_cruft = opt.cruft;
 812         sbi->s_hide = opt.hide;
 813         sbi->s_showassoc = opt.showassoc;
 814         sbi->s_uid = opt.uid;
 815         sbi->s_gid = opt.gid;
 816         sbi->s_uid_set = opt.uid_set;
 817         sbi->s_gid_set = opt.gid_set;
 818         sbi->s_utf8 = opt.utf8;
 819         sbi->s_nocompress = opt.nocompress;
 820         sbi->s_overriderockperm = opt.overriderockperm;
 821         /*
 822          * It would be incredibly stupid to allow people to mark every file
 823          * on the disk as suid, so we merely allow them to set the default
 824          * permissions.
 825          */
 826         if (opt.fmode != ISOFS_INVALID_MODE)
 827                 sbi->s_fmode = opt.fmode & 0777;
 828         else
 829                 sbi->s_fmode = ISOFS_INVALID_MODE;
 830         if (opt.dmode != ISOFS_INVALID_MODE)
 831                 sbi->s_dmode = opt.dmode & 0777;
 832         else
 833                 sbi->s_dmode = ISOFS_INVALID_MODE;
 834
 835         /*
 836          * Read the root inode, which _may_ result in changing
 837          * the s_rock flag. Once we have the final s_rock value,
 838          * we then decide whether to use the Joliet descriptor.
 839          */
 840         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 841         if (IS_ERR(inode))
 842                 goto out_no_root;
 843
 844         /*
 845          * If this disk has both Rock Ridge and Joliet on it, then we
 846          * want to use Rock Ridge by default.  This can be overridden
 847          * by using the norock mount option.  There is still one other
 848          * possibility that is not taken into account: a Rock Ridge
 849          * CD with Unicode names.  Until someone sees such a beast, it
 850          * will not be supported.
 851          */
 852         if (sbi->s_rock == 1) {
 853                 joliet_level = 0;
 854         } else if (joliet_level) {
 855                 sbi->s_rock = 0;
 856                 if (sbi->s_firstdatazone != first_data_zone) {
 857                         sbi->s_firstdatazone = first_data_zone;
 858                         printk(KERN_DEBUG
 859                                 "ISOFS: changing to secondary root\n");
 860                         iput(inode);
 861                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
 862                         if (IS_ERR(inode))
 863                                 goto out_no_root;
 864                 }
 865         }
 866
 867         if (opt.check == 'u') {
 868                 /* Only Joliet is case insensitive by default */
 869                 if (joliet_level)
 870                         opt.check = 'r';
 871                 else
 872                         opt.check = 's';
 873         }
 874         sbi->s_joliet_level = joliet_level;
 875
 876         /* Make sure the root inode is a directory */
 877         if (!S_ISDIR(inode->i_mode)) {
 878                 printk(KERN_WARNING
 879                         "isofs_fill_super: root inode is not a directory. "
 880                         "Corrupted media?\n");
 881                 goto out_iput;
 882         }
 883
 884         /* get the root dentry */
 885         s->s_root = d_alloc_root(inode);
 886         if (!(s->s_root))
 887                 goto out_no_root;
 888
 889         table = 0;
 890         if (joliet_level)
 891                 table += 2;
 892         if (opt.check == 'r')
 893                 table++;
 894         s->s_root->d_op = &isofs_dentry_ops[table];
 895
 896         kfree(opt.iocharset);
 897
 898         return 0;
 899
 900         /*
 901          * Display error messages and free resources.
 902          */
 903 out_iput:
 904         iput(inode);
 905         goto out_no_inode;
 906 out_no_root:
 907         error = PTR_ERR(inode);
 908         if (error != -ENOMEM)
 909                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
 910 out_no_inode:
 911 #ifdef CONFIG_JOLIET
 912         unload_nls(sbi->s_nls_iocharset);
 913 #endif
 914         goto out_freesbi;
 915 out_no_read:
 916         printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
 917                 __func__, s->s_id, iso_blknum, block);
 918         goto out_freesbi;
 919 out_bad_zone_size:
 920         printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
 921                 sbi->s_log_zone_size);
 922         goto out_freebh;
 923 out_bad_size:
 924         printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
 925                 orig_zonesize, opt.blocksize);
 926         goto out_freebh;
 927 out_unknown_format:
 928         if (!silent)
 929                 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
 930
 931 out_freebh:
 932         brelse(bh);
 933 out_freesbi:
 934         kfree(opt.iocharset);
 935         kfree(sbi);
 936         s->s_fs_info = NULL;
 937         return error;
 938 }
 939
 940 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
 941 {
 942         struct super_block *sb = dentry->d_sb;
 943         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 944
 945         buf->f_type = ISOFS_SUPER_MAGIC;
 946         buf->f_bsize = sb->s_blocksize;
 947         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
 948                 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
 949         buf->f_bfree = 0;
 950         buf->f_bavail = 0;
 951         buf->f_files = ISOFS_SB(sb)->s_ninodes;
 952         buf->f_ffree = 0;
 953         buf->f_fsid.val[0] = (u32)id;
 954         buf->f_fsid.val[1] = (u32)(id >> 32);
 955         buf->f_namelen = NAME_MAX;
 956         return 0;
 957 }
 958
 959 /*
 960  * Get a set of blocks; filling in buffer_heads if already allocated
 961  * or getblk() if they are not.  Returns the number of blocks inserted
 962  * (-ve == error.)
 963  */
 964 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
 965                      struct buffer_head **bh, unsigned long nblocks)
 966 {
 967         unsigned long b_off;
 968         unsigned offset, sect_size;
 969         unsigned int firstext;
 970         unsigned long nextblk, nextoff;
 971         long iblock = (long)iblock_s;
 972         int section, rv, error;
 973         struct iso_inode_info *ei = ISOFS_I(inode);
 974
 975         lock_kernel();
 976
 977         error = -EIO;
 978         rv = 0;
 979         if (iblock < 0 || iblock != iblock_s) {
 980                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
 981                 goto abort;
 982         }
 983
 984         b_off = iblock;
 985
 986         offset = 0;
 987         firstext = ei->i_first_extent;
 988         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
 989         nextblk = ei->i_next_section_block;
 990         nextoff = ei->i_next_section_offset;
 991         section = 0;
 992
 993         while (nblocks) {
 994                 /* If we are *way* beyond the end of the file, print a message.
 995                  * Access beyond the end of the file up to the next page boundary
 996                  * is normal, however because of the way the page cache works.
 997                  * In this case, we just return 0 so that we can properly fill
 998                  * the page with useless information without generating any
 999                  * I/O errors.
1000                  */
1001                 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1002                         printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
1003                                 __func__, iblock, (unsigned long) inode->i_size);
1004                         goto abort;
1005                 }
1006
1007                 /* On the last section, nextblk == 0, section size is likely to
1008                  * exceed sect_size by a partial block, and access beyond the
1009                  * end of the file will reach beyond the section size, too.
1010                  */
1011                 while (nextblk && (b_off >= (offset + sect_size))) {
1012                         struct inode *ninode;
1013
1014                         offset += sect_size;
1015                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1016                         if (IS_ERR(ninode)) {
1017                                 error = PTR_ERR(ninode);
1018                                 goto abort;
1019                         }
1020                         firstext  = ISOFS_I(ninode)->i_first_extent;
1021                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1022                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
1023                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1024                         iput(ninode);
1025
1026                         if (++section > 100) {
1027                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1028                                         " aborting...\n", __func__);
1029                                 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1030                                         "nextblk=%lu nextoff=%lu\n", __func__,
1031                                         iblock, firstext, (unsigned) sect_size,
1032                                         nextblk, nextoff);
1033                                 goto abort;
1034                         }
1035                 }
1036
1037                 if (*bh) {
1038                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1039                 } else {
1040                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1041                         if (!*bh)
1042                                 goto abort;
1043                 }
1044                 bh++;   /* Next buffer head */
1045                 b_off++;        /* Next buffer offset */
1046                 nblocks--;
1047                 rv++;
1048         }
1049
1050         error = 0;
1051 abort:
1052         unlock_kernel();
1053         return rv != 0 ? rv : error;
1054 }
1055
1056 /*
1057  * Used by the standard interfaces.
1058  */
1059 static int isofs_get_block(struct inode *inode, sector_t iblock,
1060                     struct buffer_head *bh_result, int create)
1061 {
1062         int ret;
1063
1064         if (create) {
1065                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1066                 return -EROFS;
1067         }
1068
1069         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1070         return ret < 0 ? ret : 0;
1071 }
1072
1073 static int isofs_bmap(struct inode *inode, sector_t block)
1074 {
1075         struct buffer_head dummy;
1076         int error;
1077
1078         dummy.b_state = 0;
1079         dummy.b_blocknr = -1000;
1080         error = isofs_get_block(inode, block, &dummy, 0);
1081         if (!error)
1082                 return dummy.b_blocknr;
1083         return 0;
1084 }
1085
1086 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1087 {
1088         sector_t blknr = isofs_bmap(inode, block);
1089         if (!blknr)
1090                 return NULL;
1091         return sb_bread(inode->i_sb, blknr);
1092 }
1093
1094 static int isofs_readpage(struct file *file, struct page *page)
1095 {
1096         return block_read_full_page(page,isofs_get_block);
1097 }
1098
1099 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1100 {
1101         return generic_block_bmap(mapping,block,isofs_get_block);
1102 }
1103
1104 static const struct address_space_operations isofs_aops = {
1105         .readpage = isofs_readpage,
1106         .sync_page = block_sync_page,
1107         .bmap = _isofs_bmap
1108 };
1109
1110 static int isofs_read_level3_size(struct inode *inode)
1111 {
1112         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1113         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1114         struct buffer_head *bh = NULL;
1115         unsigned long block, offset, block_saved, offset_saved;
1116         int i = 0;
1117         int more_entries = 0;
1118         struct iso_directory_record *tmpde = NULL;
1119         struct iso_inode_info *ei = ISOFS_I(inode);
1120
1121         inode->i_size = 0;
1122
1123         /* The first 16 blocks are reserved as the System Area.  Thus,
1124          * no inodes can appear in block 0.  We use this to flag that
1125          * this is the last section. */
1126         ei->i_next_section_block = 0;
1127         ei->i_next_section_offset = 0;
1128
1129         block = ei->i_iget5_block;
1130         offset = ei->i_iget5_offset;
1131
1132         do {
1133                 struct iso_directory_record *de;
1134                 unsigned int de_len;
1135
1136                 if (!bh) {
1137                         bh = sb_bread(inode->i_sb, block);
1138                         if (!bh)
1139                                 goto out_noread;
1140                 }
1141                 de = (struct iso_directory_record *) (bh->b_data + offset);
1142                 de_len = *(unsigned char *) de;
1143
1144                 if (de_len == 0) {
1145                         brelse(bh);
1146                         bh = NULL;
1147                         ++block;
1148                         offset = 0;
1149                         continue;
1150                 }
1151
1152                 block_saved = block;
1153                 offset_saved = offset;
1154                 offset += de_len;
1155
1156                 /* Make sure we have a full directory entry */
1157                 if (offset >= bufsize) {
1158                         int slop = bufsize - offset + de_len;
1159                         if (!tmpde) {
1160                                 tmpde = kmalloc(256, GFP_KERNEL);
1161                                 if (!tmpde)
1162                                         goto out_nomem;
1163                         }
1164                         memcpy(tmpde, de, slop);
1165                         offset &= bufsize - 1;
1166                         block++;
1167                         brelse(bh);
1168                         bh = NULL;
1169                         if (offset) {
1170                                 bh = sb_bread(inode->i_sb, block);
1171                                 if (!bh)
1172                                         goto out_noread;
1173                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1174                         }
1175                         de = tmpde;
1176                 }
1177
1178                 inode->i_size += isonum_733(de->size);
1179                 if (i == 1) {
1180                         ei->i_next_section_block = block_saved;
1181                         ei->i_next_section_offset = offset_saved;
1182                 }
1183
1184                 more_entries = de->flags[-high_sierra] & 0x80;
1185
1186                 i++;
1187                 if (i > 100)
1188                         goto out_toomany;
1189         } while (more_entries);
1190 out:
1191         kfree(tmpde);
1192         if (bh)
1193                 brelse(bh);
1194         return 0;
1195
1196 out_nomem:
1197         if (bh)
1198                 brelse(bh);
1199         return -ENOMEM;
1200
1201 out_noread:
1202         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1203         kfree(tmpde);
1204         return -EIO;
1205
1206 out_toomany:
1207         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1208                 "isofs_read_level3_size: inode=%lu\n",
1209                 __func__, inode->i_ino);
1210         goto out;
1211 }
1212
1213 static int isofs_read_inode(struct inode *inode)
1214 {
1215         struct super_block *sb = inode->i_sb;
1216         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1217         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1218         unsigned long block;
1219         int high_sierra = sbi->s_high_sierra;
1220         struct buffer_head *bh = NULL;
1221         struct iso_directory_record *de;
1222         struct iso_directory_record *tmpde = NULL;
1223         unsigned int de_len;
1224         unsigned long offset;
1225         struct iso_inode_info *ei = ISOFS_I(inode);
1226         int ret = -EIO;
1227
1228         block = ei->i_iget5_block;
1229         bh = sb_bread(inode->i_sb, block);
1230         if (!bh)
1231                 goto out_badread;
1232
1233         offset = ei->i_iget5_offset;
1234
1235         de = (struct iso_directory_record *) (bh->b_data + offset);
1236         de_len = *(unsigned char *) de;
1237
1238         if (offset + de_len > bufsize) {
1239                 int frag1 = bufsize - offset;
1240
1241                 tmpde = kmalloc(de_len, GFP_KERNEL);
1242                 if (tmpde == NULL) {
1243                         printk(KERN_INFO "%s: out of memory\n", __func__);
1244                         ret = -ENOMEM;
1245                         goto fail;
1246                 }
1247                 memcpy(tmpde, bh->b_data + offset, frag1);
1248                 brelse(bh);
1249                 bh = sb_bread(inode->i_sb, ++block);
1250                 if (!bh)
1251                         goto out_badread;
1252                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1253                 de = tmpde;
1254         }
1255
1256         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1257                                         ei->i_iget5_offset,
1258                                         ISOFS_BUFFER_BITS(inode));
1259
1260         /* Assume it is a normal-format file unless told otherwise */
1261         ei->i_file_format = isofs_file_normal;
1262
1263         if (de->flags[-high_sierra] & 2) {
1264                 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1265                         inode->i_mode = S_IFDIR | sbi->s_dmode;
1266                 else
1267                         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1268                 inode->i_nlink = 1;     /*
1269                                          * Set to 1.  We know there are 2, but
1270                                          * the find utility tries to optimize
1271                                          * if it is 2, and it screws up.  It is
1272                                          * easier to give 1 which tells find to
1273                                          * do it the hard way.
1274                                          */
1275         } else {
1276                 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1277                         inode->i_mode = S_IFREG | sbi->s_fmode;
1278                 } else {
1279                         /*
1280                          * Set default permissions: r-x for all.  The disc
1281                          * could be shared with DOS machines so virtually
1282                          * anything could be a valid executable.
1283                          */
1284                         inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1285                 }
1286                 inode->i_nlink = 1;
1287         }
1288         inode->i_uid = sbi->s_uid;
1289         inode->i_gid = sbi->s_gid;
1290         inode->i_blocks = 0;
1291
1292         ei->i_format_parm[0] = 0;
1293         ei->i_format_parm[1] = 0;
1294         ei->i_format_parm[2] = 0;
1295
1296         ei->i_section_size = isonum_733(de->size);
1297         if (de->flags[-high_sierra] & 0x80) {
1298                 ret = isofs_read_level3_size(inode);
1299                 if (ret < 0)
1300                         goto fail;
1301                 ret = -EIO;
1302         } else {
1303                 ei->i_next_section_block = 0;
1304                 ei->i_next_section_offset = 0;
1305                 inode->i_size = isonum_733(de->size);
1306         }
1307
1308         /*
1309          * Some dipshit decided to store some other bit of information
1310          * in the high byte of the file length.  Truncate size in case
1311          * this CDROM was mounted with the cruft option.
1312          */
1313
1314         if (sbi->s_cruft)
1315                 inode->i_size &= 0x00ffffff;
1316
1317         if (de->interleave[0]) {
1318                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1319                 inode->i_size = 0;
1320         }
1321
1322         /* I have no idea what file_unit_size is used for, so
1323            we will flag it for now */
1324         if (de->file_unit_size[0] != 0) {
1325                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1326                         inode->i_ino);
1327         }
1328
1329         /* I have no idea what other flag bits are used for, so
1330            we will flag it for now */
1331 #ifdef DEBUG
1332         if((de->flags[-high_sierra] & ~2)!= 0){
1333                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1334                                 "(%ld %x).\n",
1335                         inode->i_ino, de->flags[-high_sierra]);
1336         }
1337 #endif
1338
1339         inode->i_mtime.tv_sec =
1340         inode->i_atime.tv_sec =
1341         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1342         inode->i_mtime.tv_nsec =
1343         inode->i_atime.tv_nsec =
1344         inode->i_ctime.tv_nsec = 0;
1345
1346         ei->i_first_extent = (isonum_733(de->extent) +
1347                         isonum_711(de->ext_attr_length));
1348
1349         /* Set the number of blocks for stat() - should be done before RR */
1350         inode->i_blocks = (inode->i_size + 511) >> 9;
1351
1352         /*
1353          * Now test for possible Rock Ridge extensions which will override
1354          * some of these numbers in the inode structure.
1355          */
1356
1357         if (!high_sierra) {
1358                 parse_rock_ridge_inode(de, inode);
1359                 /* if we want uid/gid set, override the rock ridge setting */
1360                 if (sbi->s_uid_set)
1361                         inode->i_uid = sbi->s_uid;
1362                 if (sbi->s_gid_set)
1363                         inode->i_gid = sbi->s_gid;
1364         }
1365         /* Now set final access rights if overriding rock ridge setting */
1366         if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1367             sbi->s_dmode != ISOFS_INVALID_MODE)
1368                 inode->i_mode = S_IFDIR | sbi->s_dmode;
1369         if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1370             sbi->s_fmode != ISOFS_INVALID_MODE)
1371                 inode->i_mode = S_IFREG | sbi->s_fmode;
1372
1373         /* Install the inode operations vector */
1374         if (S_ISREG(inode->i_mode)) {
1375                 inode->i_fop = &generic_ro_fops;
1376                 switch (ei->i_file_format) {
1377 #ifdef CONFIG_ZISOFS
1378                 case isofs_file_compressed:
1379                         inode->i_data.a_ops = &zisofs_aops;
1380                         break;
1381 #endif
1382                 default:
1383                         inode->i_data.a_ops = &isofs_aops;
1384                         break;
1385                 }
1386         } else if (S_ISDIR(inode->i_mode)) {
1387                 inode->i_op = &isofs_dir_inode_operations;
1388                 inode->i_fop = &isofs_dir_operations;
1389         } else if (S_ISLNK(inode->i_mode)) {
1390                 inode->i_op = &page_symlink_inode_operations;
1391                 inode->i_data.a_ops = &isofs_symlink_aops;
1392         } else
1393                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1394                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1395
1396         ret = 0;
1397 out:
1398         kfree(tmpde);
1399         if (bh)
1400                 brelse(bh);
1401         return ret;
1402
1403 out_badread:
1404         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1405 fail:
1406         goto out;
1407 }
1408
1409 struct isofs_iget5_callback_data {
1410         unsigned long block;
1411         unsigned long offset;
1412 };
1413
1414 static int isofs_iget5_test(struct inode *ino, void *data)
1415 {
1416         struct iso_inode_info *i = ISOFS_I(ino);
1417         struct isofs_iget5_callback_data *d =
1418                 (struct isofs_iget5_callback_data*)data;
1419         return (i->i_iget5_block == d->block)
1420                 && (i->i_iget5_offset == d->offset);
1421 }
1422
1423 static int isofs_iget5_set(struct inode *ino, void *data)
1424 {
1425         struct iso_inode_info *i = ISOFS_I(ino);
1426         struct isofs_iget5_callback_data *d =
1427                 (struct isofs_iget5_callback_data*)data;
1428         i->i_iget5_block = d->block;
1429         i->i_iget5_offset = d->offset;
1430         return 0;
1431 }
1432
1433 /* Store, in the inode's containing structure, the block and block
1434  * offset that point to the underlying meta-data for the inode.  The
1435  * code below is otherwise similar to the iget() code in
1436  * include/linux/fs.h */
1437 struct inode *isofs_iget(struct super_block *sb,
1438                          unsigned long block,
1439                          unsigned long offset)
1440 {
1441         unsigned long hashval;
1442         struct inode *inode;
1443         struct isofs_iget5_callback_data data;
1444         long ret;
1445
1446         if (offset >= 1ul << sb->s_blocksize_bits)
1447                 return ERR_PTR(-EINVAL);
1448
1449         data.block = block;
1450         data.offset = offset;
1451
1452         hashval = (block << sb->s_blocksize_bits) | offset;
1453
1454         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1455                                 &isofs_iget5_set, &data);
1456
1457         if (!inode)
1458                 return ERR_PTR(-ENOMEM);
1459
1460         if (inode->i_state & I_NEW) {
1461                 ret = isofs_read_inode(inode);
1462                 if (ret < 0) {
1463                         iget_failed(inode);
1464                         inode = ERR_PTR(ret);
1465                 } else {
1466                         unlock_new_inode(inode);
1467                 }
1468         }
1469
1470         return inode;
1471 }
1472
1473 static int isofs_get_sb(struct file_system_type *fs_type,
1474         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1475 {
1476         return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1477                                 mnt);
1478 }
1479
1480 static struct file_system_type iso9660_fs_type = {
1481         .owner          = THIS_MODULE,
1482         .name           = "iso9660",
1483         .get_sb         = isofs_get_sb,
1484         .kill_sb        = kill_block_super,
1485         .fs_flags       = FS_REQUIRES_DEV,
1486 };
1487
1488 static int __init init_iso9660_fs(void)
1489 {
1490         int err = init_inodecache();
1491         if (err)
1492                 goto out;
1493 #ifdef CONFIG_ZISOFS
1494         err = zisofs_init();
1495         if (err)
1496                 goto out1;
1497 #endif
1498         err = register_filesystem(&iso9660_fs_type);
1499         if (err)
1500                 goto out2;
1501         return 0;
1502 out2:
1503 #ifdef CONFIG_ZISOFS
1504         zisofs_cleanup();
1505 out1:
1506 #endif
1507         destroy_inodecache();
1508 out:
1509         return err;
1510 }
1511
1512 static void __exit exit_iso9660_fs(void)
1513 {
1514         unregister_filesystem(&iso9660_fs_type);
1515 #ifdef CONFIG_ZISOFS
1516         zisofs_cleanup();
1517 #endif
1518         destroy_inodecache();
1519 }
1520
1521 module_init(init_iso9660_fs)
1522 module_exit(exit_iso9660_fs)
1523 MODULE_LICENSE("GPL");
1524 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1525 MODULE_ALIAS("iso9660");