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/cred.h> 19 #include <linux/nls.h> 20 #include <linux/ctype.h> 21 #include <linux/statfs.h> 22 #include <linux/cdrom.h> 23 #include <linux/parser.h> 24 #include <linux/mpage.h> 25 #include <linux/user_namespace.h> 26 #include <linux/seq_file.h> 27 28 #include "isofs.h" 29 #include "zisofs.h" 30 31 #define BEQUIET 32 33 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); 34 static int isofs_dentry_cmpi(const struct dentry *dentry, 35 unsigned int len, const char *str, const struct qstr *name); 36 37 #ifdef CONFIG_JOLIET 38 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); 39 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); 40 static int isofs_dentry_cmpi_ms(const struct dentry *dentry, 41 unsigned int len, const char *str, const struct qstr *name); 42 static int isofs_dentry_cmp_ms(const struct dentry *dentry, 43 unsigned int len, const char *str, const struct qstr *name); 44 #endif 45 46 static void isofs_put_super(struct super_block *sb) 47 { 48 struct isofs_sb_info *sbi = ISOFS_SB(sb); 49 50 #ifdef CONFIG_JOLIET 51 unload_nls(sbi->s_nls_iocharset); 52 #endif 53 54 kfree(sbi); 55 sb->s_fs_info = NULL; 56 return; 57 } 58 59 static int isofs_read_inode(struct inode *, int relocated); 60 static int isofs_statfs (struct dentry *, struct kstatfs *); 61 static int isofs_show_options(struct seq_file *, struct dentry *); 62 63 static struct kmem_cache *isofs_inode_cachep; 64 65 static struct inode *isofs_alloc_inode(struct super_block *sb) 66 { 67 struct iso_inode_info *ei; 68 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); 69 if (!ei) 70 return NULL; 71 return &ei->vfs_inode; 72 } 73 74 static void isofs_i_callback(struct rcu_head *head) 75 { 76 struct inode *inode = container_of(head, struct inode, i_rcu); 77 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 78 } 79 80 static void isofs_destroy_inode(struct inode *inode) 81 { 82 call_rcu(&inode->i_rcu, isofs_i_callback); 83 } 84 85 static void init_once(void *foo) 86 { 87 struct iso_inode_info *ei = foo; 88 89 inode_init_once(&ei->vfs_inode); 90 } 91 92 static int __init init_inodecache(void) 93 { 94 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", 95 sizeof(struct iso_inode_info), 96 0, (SLAB_RECLAIM_ACCOUNT| 97 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 98 init_once); 99 if (!isofs_inode_cachep) 100 return -ENOMEM; 101 return 0; 102 } 103 104 static void destroy_inodecache(void) 105 { 106 /* 107 * Make sure all delayed rcu free inodes are flushed before we 108 * destroy cache. 109 */ 110 rcu_barrier(); 111 kmem_cache_destroy(isofs_inode_cachep); 112 } 113 114 static int isofs_remount(struct super_block *sb, int *flags, char *data) 115 { 116 sync_filesystem(sb); 117 if (!(*flags & SB_RDONLY)) 118 return -EROFS; 119 return 0; 120 } 121 122 static const struct super_operations isofs_sops = { 123 .alloc_inode = isofs_alloc_inode, 124 .destroy_inode = isofs_destroy_inode, 125 .put_super = isofs_put_super, 126 .statfs = isofs_statfs, 127 .remount_fs = isofs_remount, 128 .show_options = isofs_show_options, 129 }; 130 131 132 static const struct dentry_operations isofs_dentry_ops[] = { 133 { 134 .d_hash = isofs_hashi, 135 .d_compare = isofs_dentry_cmpi, 136 }, 137 #ifdef CONFIG_JOLIET 138 { 139 .d_hash = isofs_hash_ms, 140 .d_compare = isofs_dentry_cmp_ms, 141 }, 142 { 143 .d_hash = isofs_hashi_ms, 144 .d_compare = isofs_dentry_cmpi_ms, 145 }, 146 #endif 147 }; 148 149 struct iso9660_options{ 150 unsigned int rock:1; 151 unsigned int joliet:1; 152 unsigned int cruft:1; 153 unsigned int hide:1; 154 unsigned int showassoc:1; 155 unsigned int nocompress:1; 156 unsigned int overriderockperm:1; 157 unsigned int uid_set:1; 158 unsigned int gid_set:1; 159 unsigned int utf8:1; 160 unsigned char map; 161 unsigned char check; 162 unsigned int blocksize; 163 umode_t fmode; 164 umode_t dmode; 165 kgid_t gid; 166 kuid_t uid; 167 char *iocharset; 168 /* LVE */ 169 s32 session; 170 s32 sbsector; 171 }; 172 173 /* 174 * Compute the hash for the isofs name corresponding to the dentry. 175 */ 176 static int 177 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) 178 { 179 const char *name; 180 int len; 181 char c; 182 unsigned long hash; 183 184 len = qstr->len; 185 name = qstr->name; 186 if (ms) { 187 while (len && name[len-1] == '.') 188 len--; 189 } 190 191 hash = init_name_hash(dentry); 192 while (len--) { 193 c = tolower(*name++); 194 hash = partial_name_hash(c, hash); 195 } 196 qstr->hash = end_name_hash(hash); 197 198 return 0; 199 } 200 201 /* 202 * Compare of two isofs names. 203 */ 204 static int isofs_dentry_cmp_common( 205 unsigned int len, const char *str, 206 const struct qstr *name, int ms, int ci) 207 { 208 int alen, blen; 209 210 /* A filename cannot end in '.' or we treat it like it has none */ 211 alen = name->len; 212 blen = len; 213 if (ms) { 214 while (alen && name->name[alen-1] == '.') 215 alen--; 216 while (blen && str[blen-1] == '.') 217 blen--; 218 } 219 if (alen == blen) { 220 if (ci) { 221 if (strncasecmp(name->name, str, alen) == 0) 222 return 0; 223 } else { 224 if (strncmp(name->name, str, alen) == 0) 225 return 0; 226 } 227 } 228 return 1; 229 } 230 231 static int 232 isofs_hashi(const struct dentry *dentry, struct qstr *qstr) 233 { 234 return isofs_hashi_common(dentry, qstr, 0); 235 } 236 237 static int 238 isofs_dentry_cmpi(const struct dentry *dentry, 239 unsigned int len, const char *str, const struct qstr *name) 240 { 241 return isofs_dentry_cmp_common(len, str, name, 0, 1); 242 } 243 244 #ifdef CONFIG_JOLIET 245 /* 246 * Compute the hash for the isofs name corresponding to the dentry. 247 */ 248 static int 249 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) 250 { 251 const char *name; 252 int len; 253 254 len = qstr->len; 255 name = qstr->name; 256 if (ms) { 257 while (len && name[len-1] == '.') 258 len--; 259 } 260 261 qstr->hash = full_name_hash(dentry, name, len); 262 263 return 0; 264 } 265 266 static int 267 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) 268 { 269 return isofs_hash_common(dentry, qstr, 1); 270 } 271 272 static int 273 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) 274 { 275 return isofs_hashi_common(dentry, qstr, 1); 276 } 277 278 static int 279 isofs_dentry_cmp_ms(const struct dentry *dentry, 280 unsigned int len, const char *str, const struct qstr *name) 281 { 282 return isofs_dentry_cmp_common(len, str, name, 1, 0); 283 } 284 285 static int 286 isofs_dentry_cmpi_ms(const struct dentry *dentry, 287 unsigned int len, const char *str, const struct qstr *name) 288 { 289 return isofs_dentry_cmp_common(len, str, name, 1, 1); 290 } 291 #endif 292 293 enum { 294 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, 295 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, 296 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, 297 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, 298 }; 299 300 static const match_table_t tokens = { 301 {Opt_norock, "norock"}, 302 {Opt_nojoliet, "nojoliet"}, 303 {Opt_unhide, "unhide"}, 304 {Opt_hide, "hide"}, 305 {Opt_showassoc, "showassoc"}, 306 {Opt_cruft, "cruft"}, 307 {Opt_utf8, "utf8"}, 308 {Opt_iocharset, "iocharset=%s"}, 309 {Opt_map_a, "map=acorn"}, 310 {Opt_map_a, "map=a"}, 311 {Opt_map_n, "map=normal"}, 312 {Opt_map_n, "map=n"}, 313 {Opt_map_o, "map=off"}, 314 {Opt_map_o, "map=o"}, 315 {Opt_session, "session=%u"}, 316 {Opt_sb, "sbsector=%u"}, 317 {Opt_check_r, "check=relaxed"}, 318 {Opt_check_r, "check=r"}, 319 {Opt_check_s, "check=strict"}, 320 {Opt_check_s, "check=s"}, 321 {Opt_uid, "uid=%u"}, 322 {Opt_gid, "gid=%u"}, 323 {Opt_mode, "mode=%u"}, 324 {Opt_dmode, "dmode=%u"}, 325 {Opt_overriderockperm, "overriderockperm"}, 326 {Opt_block, "block=%u"}, 327 {Opt_ignore, "conv=binary"}, 328 {Opt_ignore, "conv=b"}, 329 {Opt_ignore, "conv=text"}, 330 {Opt_ignore, "conv=t"}, 331 {Opt_ignore, "conv=mtext"}, 332 {Opt_ignore, "conv=m"}, 333 {Opt_ignore, "conv=auto"}, 334 {Opt_ignore, "conv=a"}, 335 {Opt_nocompress, "nocompress"}, 336 {Opt_err, NULL} 337 }; 338 339 static int parse_options(char *options, struct iso9660_options *popt) 340 { 341 char *p; 342 int option; 343 344 popt->map = 'n'; 345 popt->rock = 1; 346 popt->joliet = 1; 347 popt->cruft = 0; 348 popt->hide = 0; 349 popt->showassoc = 0; 350 popt->check = 'u'; /* unset */ 351 popt->nocompress = 0; 352 popt->blocksize = 1024; 353 popt->fmode = popt->dmode = ISOFS_INVALID_MODE; 354 popt->uid_set = 0; 355 popt->gid_set = 0; 356 popt->gid = GLOBAL_ROOT_GID; 357 popt->uid = GLOBAL_ROOT_UID; 358 popt->iocharset = NULL; 359 popt->utf8 = 0; 360 popt->overriderockperm = 0; 361 popt->session=-1; 362 popt->sbsector=-1; 363 if (!options) 364 return 1; 365 366 while ((p = strsep(&options, ",")) != NULL) { 367 int token; 368 substring_t args[MAX_OPT_ARGS]; 369 unsigned n; 370 371 if (!*p) 372 continue; 373 374 token = match_token(p, tokens, args); 375 switch (token) { 376 case Opt_norock: 377 popt->rock = 0; 378 break; 379 case Opt_nojoliet: 380 popt->joliet = 0; 381 break; 382 case Opt_hide: 383 popt->hide = 1; 384 break; 385 case Opt_unhide: 386 case Opt_showassoc: 387 popt->showassoc = 1; 388 break; 389 case Opt_cruft: 390 popt->cruft = 1; 391 break; 392 case Opt_utf8: 393 popt->utf8 = 1; 394 break; 395 #ifdef CONFIG_JOLIET 396 case Opt_iocharset: 397 kfree(popt->iocharset); 398 popt->iocharset = match_strdup(&args[0]); 399 if (!popt->iocharset) 400 return 0; 401 break; 402 #endif 403 case Opt_map_a: 404 popt->map = 'a'; 405 break; 406 case Opt_map_o: 407 popt->map = 'o'; 408 break; 409 case Opt_map_n: 410 popt->map = 'n'; 411 break; 412 case Opt_session: 413 if (match_int(&args[0], &option)) 414 return 0; 415 n = option; 416 /* 417 * Track numbers are supposed to be in range 1-99, the 418 * mount option starts indexing at 0. 419 */ 420 if (n >= 99) 421 return 0; 422 popt->session = n + 1; 423 break; 424 case Opt_sb: 425 if (match_int(&args[0], &option)) 426 return 0; 427 popt->sbsector = option; 428 break; 429 case Opt_check_r: 430 popt->check = 'r'; 431 break; 432 case Opt_check_s: 433 popt->check = 's'; 434 break; 435 case Opt_ignore: 436 break; 437 case Opt_uid: 438 if (match_int(&args[0], &option)) 439 return 0; 440 popt->uid = make_kuid(current_user_ns(), option); 441 if (!uid_valid(popt->uid)) 442 return 0; 443 popt->uid_set = 1; 444 break; 445 case Opt_gid: 446 if (match_int(&args[0], &option)) 447 return 0; 448 popt->gid = make_kgid(current_user_ns(), option); 449 if (!gid_valid(popt->gid)) 450 return 0; 451 popt->gid_set = 1; 452 break; 453 case Opt_mode: 454 if (match_int(&args[0], &option)) 455 return 0; 456 popt->fmode = option; 457 break; 458 case Opt_dmode: 459 if (match_int(&args[0], &option)) 460 return 0; 461 popt->dmode = option; 462 break; 463 case Opt_overriderockperm: 464 popt->overriderockperm = 1; 465 break; 466 case Opt_block: 467 if (match_int(&args[0], &option)) 468 return 0; 469 n = option; 470 if (n != 512 && n != 1024 && n != 2048) 471 return 0; 472 popt->blocksize = n; 473 break; 474 case Opt_nocompress: 475 popt->nocompress = 1; 476 break; 477 default: 478 return 0; 479 } 480 } 481 return 1; 482 } 483 484 /* 485 * Display the mount options in /proc/mounts. 486 */ 487 static int isofs_show_options(struct seq_file *m, struct dentry *root) 488 { 489 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 490 491 if (!sbi->s_rock) seq_puts(m, ",norock"); 492 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 493 if (sbi->s_cruft) seq_puts(m, ",cruft"); 494 if (sbi->s_hide) seq_puts(m, ",hide"); 495 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 496 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 497 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 498 if (sbi->s_utf8) seq_puts(m, ",utf8"); 499 500 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 501 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 502 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 503 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 504 505 if (root->d_sb->s_blocksize != 1024) 506 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 507 508 if (sbi->s_uid_set) 509 seq_printf(m, ",uid=%u", 510 from_kuid_munged(&init_user_ns, sbi->s_uid)); 511 if (sbi->s_gid_set) 512 seq_printf(m, ",gid=%u", 513 from_kgid_munged(&init_user_ns, sbi->s_gid)); 514 515 if (sbi->s_dmode != ISOFS_INVALID_MODE) 516 seq_printf(m, ",dmode=%o", sbi->s_dmode); 517 if (sbi->s_fmode != ISOFS_INVALID_MODE) 518 seq_printf(m, ",fmode=%o", sbi->s_fmode); 519 520 #ifdef CONFIG_JOLIET 521 if (sbi->s_nls_iocharset && 522 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) 523 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 524 #endif 525 return 0; 526 } 527 528 /* 529 * look if the driver can tell the multi session redirection value 530 * 531 * don't change this if you don't know what you do, please! 532 * Multisession is legal only with XA disks. 533 * A non-XA disk with more than one volume descriptor may do it right, but 534 * usually is written in a nowhere standardized "multi-partition" manner. 535 * Multisession uses absolute addressing (solely the first frame of the whole 536 * track is #0), multi-partition uses relative addressing (each first frame of 537 * each track is #0), and a track is not a session. 538 * 539 * A broken CDwriter software or drive firmware does not set new standards, 540 * at least not if conflicting with the existing ones. 541 * 542 * emoenke@gwdg.de 543 */ 544 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 545 546 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 547 { 548 struct cdrom_multisession ms_info; 549 unsigned int vol_desc_start; 550 struct block_device *bdev = sb->s_bdev; 551 int i; 552 553 vol_desc_start=0; 554 ms_info.addr_format=CDROM_LBA; 555 if (session > 0) { 556 struct cdrom_tocentry Te; 557 Te.cdte_track=session; 558 Te.cdte_format=CDROM_LBA; 559 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); 560 if (!i) { 561 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 562 session, Te.cdte_addr.lba, 563 Te.cdte_ctrl&CDROM_DATA_TRACK); 564 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) 565 return Te.cdte_addr.lba; 566 } 567 568 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 569 } 570 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); 571 if (session > 0) 572 printk(KERN_ERR "ISOFS: Invalid session number\n"); 573 #if 0 574 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); 575 if (i==0) { 576 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); 577 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); 578 } 579 #endif 580 if (i==0) 581 #if WE_OBEY_THE_WRITTEN_STANDARDS 582 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ 583 #endif 584 vol_desc_start=ms_info.addr.lba; 585 return vol_desc_start; 586 } 587 588 /* 589 * Check if root directory is empty (has less than 3 files). 590 * 591 * Used to detect broken CDs where ISO root directory is empty but Joliet root 592 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 593 * (and Joliet used instead) or else no files would be visible. 594 */ 595 static bool rootdir_empty(struct super_block *sb, unsigned long block) 596 { 597 int offset = 0, files = 0, de_len; 598 struct iso_directory_record *de; 599 struct buffer_head *bh; 600 601 bh = sb_bread(sb, block); 602 if (!bh) 603 return true; 604 while (files < 3) { 605 de = (struct iso_directory_record *) (bh->b_data + offset); 606 de_len = *(unsigned char *) de; 607 if (de_len == 0) 608 break; 609 files++; 610 offset += de_len; 611 } 612 brelse(bh); 613 return files < 3; 614 } 615 616 /* 617 * Initialize the superblock and read the root inode. 618 * 619 * Note: a check_disk_change() has been done immediately prior 620 * to this call, so we don't need to check again. 621 */ 622 static int isofs_fill_super(struct super_block *s, void *data, int silent) 623 { 624 struct buffer_head *bh = NULL, *pri_bh = NULL; 625 struct hs_primary_descriptor *h_pri = NULL; 626 struct iso_primary_descriptor *pri = NULL; 627 struct iso_supplementary_descriptor *sec = NULL; 628 struct iso_directory_record *rootp; 629 struct inode *inode; 630 struct iso9660_options opt; 631 struct isofs_sb_info *sbi; 632 unsigned long first_data_zone; 633 int joliet_level = 0; 634 int iso_blknum, block; 635 int orig_zonesize; 636 int table, error = -EINVAL; 637 unsigned int vol_desc_start; 638 639 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 640 if (!sbi) 641 return -ENOMEM; 642 s->s_fs_info = sbi; 643 644 if (!parse_options((char *)data, &opt)) 645 goto out_freesbi; 646 647 /* 648 * First of all, get the hardware blocksize for this device. 649 * If we don't know what it is, or the hardware blocksize is 650 * larger than the blocksize the user specified, then use 651 * that value. 652 */ 653 /* 654 * What if bugger tells us to go beyond page size? 655 */ 656 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 657 658 sbi->s_high_sierra = 0; /* default is iso9660 */ 659 sbi->s_session = opt.session; 660 sbi->s_sbsector = opt.sbsector; 661 662 vol_desc_start = (opt.sbsector != -1) ? 663 opt.sbsector : isofs_get_last_session(s,opt.session); 664 665 for (iso_blknum = vol_desc_start+16; 666 iso_blknum < vol_desc_start+100; iso_blknum++) { 667 struct hs_volume_descriptor *hdp; 668 struct iso_volume_descriptor *vdp; 669 670 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 671 if (!(bh = sb_bread(s, block))) 672 goto out_no_read; 673 674 vdp = (struct iso_volume_descriptor *)bh->b_data; 675 hdp = (struct hs_volume_descriptor *)bh->b_data; 676 677 /* 678 * Due to the overlapping physical location of the descriptors, 679 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 680 * proper identification in this case, we first check for ISO. 681 */ 682 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 683 if (isonum_711(vdp->type) == ISO_VD_END) 684 break; 685 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 686 if (!pri) { 687 pri = (struct iso_primary_descriptor *)vdp; 688 /* Save the buffer in case we need it ... */ 689 pri_bh = bh; 690 bh = NULL; 691 } 692 } 693 #ifdef CONFIG_JOLIET 694 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 695 sec = (struct iso_supplementary_descriptor *)vdp; 696 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 697 if (opt.joliet) { 698 if (sec->escape[2] == 0x40) 699 joliet_level = 1; 700 else if (sec->escape[2] == 0x43) 701 joliet_level = 2; 702 else if (sec->escape[2] == 0x45) 703 joliet_level = 3; 704 705 printk(KERN_DEBUG "ISO 9660 Extensions: " 706 "Microsoft Joliet Level %d\n", 707 joliet_level); 708 } 709 goto root_found; 710 } else { 711 /* Unknown supplementary volume descriptor */ 712 sec = NULL; 713 } 714 } 715 #endif 716 } else { 717 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 718 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 719 goto out_freebh; 720 721 sbi->s_high_sierra = 1; 722 opt.rock = 0; 723 h_pri = (struct hs_primary_descriptor *)vdp; 724 goto root_found; 725 } 726 } 727 728 /* Just skip any volume descriptors we don't recognize */ 729 730 brelse(bh); 731 bh = NULL; 732 } 733 /* 734 * If we fall through, either no volume descriptor was found, 735 * or else we passed a primary descriptor looking for others. 736 */ 737 if (!pri) 738 goto out_unknown_format; 739 brelse(bh); 740 bh = pri_bh; 741 pri_bh = NULL; 742 743 root_found: 744 /* We don't support read-write mounts */ 745 if (!sb_rdonly(s)) { 746 error = -EACCES; 747 goto out_freebh; 748 } 749 750 if (joliet_level && (!pri || !opt.rock)) { 751 /* This is the case of Joliet with the norock mount flag. 752 * A disc with both Joliet and Rock Ridge is handled later 753 */ 754 pri = (struct iso_primary_descriptor *) sec; 755 } 756 757 if(sbi->s_high_sierra){ 758 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 759 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 760 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 761 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 762 } else { 763 if (!pri) 764 goto out_freebh; 765 rootp = (struct iso_directory_record *) pri->root_directory_record; 766 sbi->s_nzones = isonum_733(pri->volume_space_size); 767 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 768 sbi->s_max_size = isonum_733(pri->volume_space_size); 769 } 770 771 sbi->s_ninodes = 0; /* No way to figure this out easily */ 772 773 orig_zonesize = sbi->s_log_zone_size; 774 /* 775 * If the zone size is smaller than the hardware sector size, 776 * this is a fatal error. This would occur if the disc drive 777 * had sectors that were 2048 bytes, but the filesystem had 778 * blocks that were 512 bytes (which should only very rarely 779 * happen.) 780 */ 781 if (orig_zonesize < opt.blocksize) 782 goto out_bad_size; 783 784 /* RDE: convert log zone size to bit shift */ 785 switch (sbi->s_log_zone_size) { 786 case 512: sbi->s_log_zone_size = 9; break; 787 case 1024: sbi->s_log_zone_size = 10; break; 788 case 2048: sbi->s_log_zone_size = 11; break; 789 790 default: 791 goto out_bad_zone_size; 792 } 793 794 s->s_magic = ISOFS_SUPER_MAGIC; 795 796 /* 797 * With multi-extent files, file size is only limited by the maximum 798 * size of a file system, which is 8 TB. 799 */ 800 s->s_maxbytes = 0x80000000000LL; 801 802 /* Set this for reference. Its not currently used except on write 803 which we don't have .. */ 804 805 first_data_zone = isonum_733(rootp->extent) + 806 isonum_711(rootp->ext_attr_length); 807 sbi->s_firstdatazone = first_data_zone; 808 #ifndef BEQUIET 809 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 810 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 811 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 812 if(sbi->s_high_sierra) 813 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 814 #endif 815 816 /* 817 * If the Joliet level is set, we _may_ decide to use the 818 * secondary descriptor, but can't be sure until after we 819 * read the root inode. But before reading the root inode 820 * we may need to change the device blocksize, and would 821 * rather release the old buffer first. So, we cache the 822 * first_data_zone value from the secondary descriptor. 823 */ 824 if (joliet_level) { 825 pri = (struct iso_primary_descriptor *) sec; 826 rootp = (struct iso_directory_record *) 827 pri->root_directory_record; 828 first_data_zone = isonum_733(rootp->extent) + 829 isonum_711(rootp->ext_attr_length); 830 } 831 832 /* 833 * We're all done using the volume descriptor, and may need 834 * to change the device blocksize, so release the buffer now. 835 */ 836 brelse(pri_bh); 837 brelse(bh); 838 839 /* 840 * Force the blocksize to 512 for 512 byte sectors. The file 841 * read primitives really get it wrong in a bad way if we don't 842 * do this. 843 * 844 * Note - we should never be setting the blocksize to something 845 * less than the hardware sector size for the device. If we 846 * do, we would end up having to read larger buffers and split 847 * out portions to satisfy requests. 848 * 849 * Note2- the idea here is that we want to deal with the optimal 850 * zonesize in the filesystem. If we have it set to something less, 851 * then we have horrible problems with trying to piece together 852 * bits of adjacent blocks in order to properly read directory 853 * entries. By forcing the blocksize in this way, we ensure 854 * that we will never be required to do this. 855 */ 856 sb_set_blocksize(s, orig_zonesize); 857 858 sbi->s_nls_iocharset = NULL; 859 860 #ifdef CONFIG_JOLIET 861 if (joliet_level && opt.utf8 == 0) { 862 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 863 sbi->s_nls_iocharset = load_nls(p); 864 if (! sbi->s_nls_iocharset) { 865 /* Fail only if explicit charset specified */ 866 if (opt.iocharset) 867 goto out_freesbi; 868 sbi->s_nls_iocharset = load_nls_default(); 869 } 870 } 871 #endif 872 s->s_op = &isofs_sops; 873 s->s_export_op = &isofs_export_ops; 874 sbi->s_mapping = opt.map; 875 sbi->s_rock = (opt.rock ? 2 : 0); 876 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 877 sbi->s_cruft = opt.cruft; 878 sbi->s_hide = opt.hide; 879 sbi->s_showassoc = opt.showassoc; 880 sbi->s_uid = opt.uid; 881 sbi->s_gid = opt.gid; 882 sbi->s_uid_set = opt.uid_set; 883 sbi->s_gid_set = opt.gid_set; 884 sbi->s_utf8 = opt.utf8; 885 sbi->s_nocompress = opt.nocompress; 886 sbi->s_overriderockperm = opt.overriderockperm; 887 /* 888 * It would be incredibly stupid to allow people to mark every file 889 * on the disk as suid, so we merely allow them to set the default 890 * permissions. 891 */ 892 if (opt.fmode != ISOFS_INVALID_MODE) 893 sbi->s_fmode = opt.fmode & 0777; 894 else 895 sbi->s_fmode = ISOFS_INVALID_MODE; 896 if (opt.dmode != ISOFS_INVALID_MODE) 897 sbi->s_dmode = opt.dmode & 0777; 898 else 899 sbi->s_dmode = ISOFS_INVALID_MODE; 900 901 /* 902 * Read the root inode, which _may_ result in changing 903 * the s_rock flag. Once we have the final s_rock value, 904 * we then decide whether to use the Joliet descriptor. 905 */ 906 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 907 if (IS_ERR(inode)) 908 goto out_no_root; 909 910 /* 911 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 912 * correct Joliet root directory. 913 */ 914 if (sbi->s_rock == 1 && joliet_level && 915 rootdir_empty(s, sbi->s_firstdatazone)) { 916 printk(KERN_NOTICE 917 "ISOFS: primary root directory is empty. " 918 "Disabling Rock Ridge and switching to Joliet."); 919 sbi->s_rock = 0; 920 } 921 922 /* 923 * If this disk has both Rock Ridge and Joliet on it, then we 924 * want to use Rock Ridge by default. This can be overridden 925 * by using the norock mount option. There is still one other 926 * possibility that is not taken into account: a Rock Ridge 927 * CD with Unicode names. Until someone sees such a beast, it 928 * will not be supported. 929 */ 930 if (sbi->s_rock == 1) { 931 joliet_level = 0; 932 } else if (joliet_level) { 933 sbi->s_rock = 0; 934 if (sbi->s_firstdatazone != first_data_zone) { 935 sbi->s_firstdatazone = first_data_zone; 936 printk(KERN_DEBUG 937 "ISOFS: changing to secondary root\n"); 938 iput(inode); 939 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 940 if (IS_ERR(inode)) 941 goto out_no_root; 942 } 943 } 944 945 if (opt.check == 'u') { 946 /* Only Joliet is case insensitive by default */ 947 if (joliet_level) 948 opt.check = 'r'; 949 else 950 opt.check = 's'; 951 } 952 sbi->s_joliet_level = joliet_level; 953 954 /* Make sure the root inode is a directory */ 955 if (!S_ISDIR(inode->i_mode)) { 956 printk(KERN_WARNING 957 "isofs_fill_super: root inode is not a directory. " 958 "Corrupted media?\n"); 959 goto out_iput; 960 } 961 962 table = 0; 963 if (joliet_level) 964 table += 2; 965 if (opt.check == 'r') 966 table++; 967 sbi->s_check = opt.check; 968 969 if (table) 970 s->s_d_op = &isofs_dentry_ops[table - 1]; 971 972 /* get the root dentry */ 973 s->s_root = d_make_root(inode); 974 if (!(s->s_root)) { 975 error = -ENOMEM; 976 goto out_no_inode; 977 } 978 979 kfree(opt.iocharset); 980 981 return 0; 982 983 /* 984 * Display error messages and free resources. 985 */ 986 out_iput: 987 iput(inode); 988 goto out_no_inode; 989 out_no_root: 990 error = PTR_ERR(inode); 991 if (error != -ENOMEM) 992 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 993 out_no_inode: 994 #ifdef CONFIG_JOLIET 995 unload_nls(sbi->s_nls_iocharset); 996 #endif 997 goto out_freesbi; 998 out_no_read: 999 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 1000 __func__, s->s_id, iso_blknum, block); 1001 goto out_freebh; 1002 out_bad_zone_size: 1003 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 1004 sbi->s_log_zone_size); 1005 goto out_freebh; 1006 out_bad_size: 1007 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 1008 orig_zonesize, opt.blocksize); 1009 goto out_freebh; 1010 out_unknown_format: 1011 if (!silent) 1012 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1013 1014 out_freebh: 1015 brelse(bh); 1016 brelse(pri_bh); 1017 out_freesbi: 1018 kfree(opt.iocharset); 1019 kfree(sbi); 1020 s->s_fs_info = NULL; 1021 return error; 1022 } 1023 1024 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1025 { 1026 struct super_block *sb = dentry->d_sb; 1027 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1028 1029 buf->f_type = ISOFS_SUPER_MAGIC; 1030 buf->f_bsize = sb->s_blocksize; 1031 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1032 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1033 buf->f_bfree = 0; 1034 buf->f_bavail = 0; 1035 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1036 buf->f_ffree = 0; 1037 buf->f_fsid.val[0] = (u32)id; 1038 buf->f_fsid.val[1] = (u32)(id >> 32); 1039 buf->f_namelen = NAME_MAX; 1040 return 0; 1041 } 1042 1043 /* 1044 * Get a set of blocks; filling in buffer_heads if already allocated 1045 * or getblk() if they are not. Returns the number of blocks inserted 1046 * (-ve == error.) 1047 */ 1048 int isofs_get_blocks(struct inode *inode, sector_t iblock, 1049 struct buffer_head **bh, unsigned long nblocks) 1050 { 1051 unsigned long b_off = iblock; 1052 unsigned offset, sect_size; 1053 unsigned int firstext; 1054 unsigned long nextblk, nextoff; 1055 int section, rv, error; 1056 struct iso_inode_info *ei = ISOFS_I(inode); 1057 1058 error = -EIO; 1059 rv = 0; 1060 if (iblock != b_off) { 1061 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1062 goto abort; 1063 } 1064 1065 1066 offset = 0; 1067 firstext = ei->i_first_extent; 1068 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1069 nextblk = ei->i_next_section_block; 1070 nextoff = ei->i_next_section_offset; 1071 section = 0; 1072 1073 while (nblocks) { 1074 /* If we are *way* beyond the end of the file, print a message. 1075 * Access beyond the end of the file up to the next page boundary 1076 * is normal, however because of the way the page cache works. 1077 * In this case, we just return 0 so that we can properly fill 1078 * the page with useless information without generating any 1079 * I/O errors. 1080 */ 1081 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1082 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1083 __func__, b_off, 1084 (unsigned long long)inode->i_size); 1085 goto abort; 1086 } 1087 1088 /* On the last section, nextblk == 0, section size is likely to 1089 * exceed sect_size by a partial block, and access beyond the 1090 * end of the file will reach beyond the section size, too. 1091 */ 1092 while (nextblk && (b_off >= (offset + sect_size))) { 1093 struct inode *ninode; 1094 1095 offset += sect_size; 1096 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1097 if (IS_ERR(ninode)) { 1098 error = PTR_ERR(ninode); 1099 goto abort; 1100 } 1101 firstext = ISOFS_I(ninode)->i_first_extent; 1102 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1103 nextblk = ISOFS_I(ninode)->i_next_section_block; 1104 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1105 iput(ninode); 1106 1107 if (++section > 100) { 1108 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1109 " aborting...\n", __func__); 1110 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1111 "nextblk=%lu nextoff=%lu\n", __func__, 1112 b_off, firstext, (unsigned) sect_size, 1113 nextblk, nextoff); 1114 goto abort; 1115 } 1116 } 1117 1118 if (*bh) { 1119 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1120 } else { 1121 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1122 if (!*bh) 1123 goto abort; 1124 } 1125 bh++; /* Next buffer head */ 1126 b_off++; /* Next buffer offset */ 1127 nblocks--; 1128 rv++; 1129 } 1130 1131 error = 0; 1132 abort: 1133 return rv != 0 ? rv : error; 1134 } 1135 1136 /* 1137 * Used by the standard interfaces. 1138 */ 1139 static int isofs_get_block(struct inode *inode, sector_t iblock, 1140 struct buffer_head *bh_result, int create) 1141 { 1142 int ret; 1143 1144 if (create) { 1145 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1146 return -EROFS; 1147 } 1148 1149 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1150 return ret < 0 ? ret : 0; 1151 } 1152 1153 static int isofs_bmap(struct inode *inode, sector_t block) 1154 { 1155 struct buffer_head dummy; 1156 int error; 1157 1158 dummy.b_state = 0; 1159 dummy.b_blocknr = -1000; 1160 error = isofs_get_block(inode, block, &dummy, 0); 1161 if (!error) 1162 return dummy.b_blocknr; 1163 return 0; 1164 } 1165 1166 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1167 { 1168 sector_t blknr = isofs_bmap(inode, block); 1169 if (!blknr) 1170 return NULL; 1171 return sb_bread(inode->i_sb, blknr); 1172 } 1173 1174 static int isofs_readpage(struct file *file, struct page *page) 1175 { 1176 return mpage_readpage(page, isofs_get_block); 1177 } 1178 1179 static int isofs_readpages(struct file *file, struct address_space *mapping, 1180 struct list_head *pages, unsigned nr_pages) 1181 { 1182 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); 1183 } 1184 1185 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1186 { 1187 return generic_block_bmap(mapping,block,isofs_get_block); 1188 } 1189 1190 static const struct address_space_operations isofs_aops = { 1191 .readpage = isofs_readpage, 1192 .readpages = isofs_readpages, 1193 .bmap = _isofs_bmap 1194 }; 1195 1196 static int isofs_read_level3_size(struct inode *inode) 1197 { 1198 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1199 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1200 struct buffer_head *bh = NULL; 1201 unsigned long block, offset, block_saved, offset_saved; 1202 int i = 0; 1203 int more_entries = 0; 1204 struct iso_directory_record *tmpde = NULL; 1205 struct iso_inode_info *ei = ISOFS_I(inode); 1206 1207 inode->i_size = 0; 1208 1209 /* The first 16 blocks are reserved as the System Area. Thus, 1210 * no inodes can appear in block 0. We use this to flag that 1211 * this is the last section. */ 1212 ei->i_next_section_block = 0; 1213 ei->i_next_section_offset = 0; 1214 1215 block = ei->i_iget5_block; 1216 offset = ei->i_iget5_offset; 1217 1218 do { 1219 struct iso_directory_record *de; 1220 unsigned int de_len; 1221 1222 if (!bh) { 1223 bh = sb_bread(inode->i_sb, block); 1224 if (!bh) 1225 goto out_noread; 1226 } 1227 de = (struct iso_directory_record *) (bh->b_data + offset); 1228 de_len = *(unsigned char *) de; 1229 1230 if (de_len == 0) { 1231 brelse(bh); 1232 bh = NULL; 1233 ++block; 1234 offset = 0; 1235 continue; 1236 } 1237 1238 block_saved = block; 1239 offset_saved = offset; 1240 offset += de_len; 1241 1242 /* Make sure we have a full directory entry */ 1243 if (offset >= bufsize) { 1244 int slop = bufsize - offset + de_len; 1245 if (!tmpde) { 1246 tmpde = kmalloc(256, GFP_KERNEL); 1247 if (!tmpde) 1248 goto out_nomem; 1249 } 1250 memcpy(tmpde, de, slop); 1251 offset &= bufsize - 1; 1252 block++; 1253 brelse(bh); 1254 bh = NULL; 1255 if (offset) { 1256 bh = sb_bread(inode->i_sb, block); 1257 if (!bh) 1258 goto out_noread; 1259 memcpy((void *)tmpde+slop, bh->b_data, offset); 1260 } 1261 de = tmpde; 1262 } 1263 1264 inode->i_size += isonum_733(de->size); 1265 if (i == 1) { 1266 ei->i_next_section_block = block_saved; 1267 ei->i_next_section_offset = offset_saved; 1268 } 1269 1270 more_entries = de->flags[-high_sierra] & 0x80; 1271 1272 i++; 1273 if (i > 100) 1274 goto out_toomany; 1275 } while (more_entries); 1276 out: 1277 kfree(tmpde); 1278 if (bh) 1279 brelse(bh); 1280 return 0; 1281 1282 out_nomem: 1283 if (bh) 1284 brelse(bh); 1285 return -ENOMEM; 1286 1287 out_noread: 1288 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1289 kfree(tmpde); 1290 return -EIO; 1291 1292 out_toomany: 1293 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1294 "isofs_read_level3_size: inode=%lu\n", 1295 __func__, inode->i_ino); 1296 goto out; 1297 } 1298 1299 static int isofs_read_inode(struct inode *inode, int relocated) 1300 { 1301 struct super_block *sb = inode->i_sb; 1302 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1303 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1304 unsigned long block; 1305 int high_sierra = sbi->s_high_sierra; 1306 struct buffer_head *bh; 1307 struct iso_directory_record *de; 1308 struct iso_directory_record *tmpde = NULL; 1309 unsigned int de_len; 1310 unsigned long offset; 1311 struct iso_inode_info *ei = ISOFS_I(inode); 1312 int ret = -EIO; 1313 1314 block = ei->i_iget5_block; 1315 bh = sb_bread(inode->i_sb, block); 1316 if (!bh) 1317 goto out_badread; 1318 1319 offset = ei->i_iget5_offset; 1320 1321 de = (struct iso_directory_record *) (bh->b_data + offset); 1322 de_len = *(unsigned char *) de; 1323 1324 if (offset + de_len > bufsize) { 1325 int frag1 = bufsize - offset; 1326 1327 tmpde = kmalloc(de_len, GFP_KERNEL); 1328 if (!tmpde) { 1329 ret = -ENOMEM; 1330 goto fail; 1331 } 1332 memcpy(tmpde, bh->b_data + offset, frag1); 1333 brelse(bh); 1334 bh = sb_bread(inode->i_sb, ++block); 1335 if (!bh) 1336 goto out_badread; 1337 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1338 de = tmpde; 1339 } 1340 1341 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1342 ei->i_iget5_offset, 1343 ISOFS_BUFFER_BITS(inode)); 1344 1345 /* Assume it is a normal-format file unless told otherwise */ 1346 ei->i_file_format = isofs_file_normal; 1347 1348 if (de->flags[-high_sierra] & 2) { 1349 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1350 inode->i_mode = S_IFDIR | sbi->s_dmode; 1351 else 1352 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1353 set_nlink(inode, 1); /* 1354 * Set to 1. We know there are 2, but 1355 * the find utility tries to optimize 1356 * if it is 2, and it screws up. It is 1357 * easier to give 1 which tells find to 1358 * do it the hard way. 1359 */ 1360 } else { 1361 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1362 inode->i_mode = S_IFREG | sbi->s_fmode; 1363 } else { 1364 /* 1365 * Set default permissions: r-x for all. The disc 1366 * could be shared with DOS machines so virtually 1367 * anything could be a valid executable. 1368 */ 1369 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1370 } 1371 set_nlink(inode, 1); 1372 } 1373 inode->i_uid = sbi->s_uid; 1374 inode->i_gid = sbi->s_gid; 1375 inode->i_blocks = 0; 1376 1377 ei->i_format_parm[0] = 0; 1378 ei->i_format_parm[1] = 0; 1379 ei->i_format_parm[2] = 0; 1380 1381 ei->i_section_size = isonum_733(de->size); 1382 if (de->flags[-high_sierra] & 0x80) { 1383 ret = isofs_read_level3_size(inode); 1384 if (ret < 0) 1385 goto fail; 1386 ret = -EIO; 1387 } else { 1388 ei->i_next_section_block = 0; 1389 ei->i_next_section_offset = 0; 1390 inode->i_size = isonum_733(de->size); 1391 } 1392 1393 /* 1394 * Some dipshit decided to store some other bit of information 1395 * in the high byte of the file length. Truncate size in case 1396 * this CDROM was mounted with the cruft option. 1397 */ 1398 1399 if (sbi->s_cruft) 1400 inode->i_size &= 0x00ffffff; 1401 1402 if (de->interleave[0]) { 1403 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1404 inode->i_size = 0; 1405 } 1406 1407 /* I have no idea what file_unit_size is used for, so 1408 we will flag it for now */ 1409 if (de->file_unit_size[0] != 0) { 1410 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1411 inode->i_ino); 1412 } 1413 1414 /* I have no idea what other flag bits are used for, so 1415 we will flag it for now */ 1416 #ifdef DEBUG 1417 if((de->flags[-high_sierra] & ~2)!= 0){ 1418 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1419 "(%ld %x).\n", 1420 inode->i_ino, de->flags[-high_sierra]); 1421 } 1422 #endif 1423 1424 inode->i_mtime.tv_sec = 1425 inode->i_atime.tv_sec = 1426 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1427 inode->i_mtime.tv_nsec = 1428 inode->i_atime.tv_nsec = 1429 inode->i_ctime.tv_nsec = 0; 1430 1431 ei->i_first_extent = (isonum_733(de->extent) + 1432 isonum_711(de->ext_attr_length)); 1433 1434 /* Set the number of blocks for stat() - should be done before RR */ 1435 inode->i_blocks = (inode->i_size + 511) >> 9; 1436 1437 /* 1438 * Now test for possible Rock Ridge extensions which will override 1439 * some of these numbers in the inode structure. 1440 */ 1441 1442 if (!high_sierra) { 1443 parse_rock_ridge_inode(de, inode, relocated); 1444 /* if we want uid/gid set, override the rock ridge setting */ 1445 if (sbi->s_uid_set) 1446 inode->i_uid = sbi->s_uid; 1447 if (sbi->s_gid_set) 1448 inode->i_gid = sbi->s_gid; 1449 } 1450 /* Now set final access rights if overriding rock ridge setting */ 1451 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1452 sbi->s_dmode != ISOFS_INVALID_MODE) 1453 inode->i_mode = S_IFDIR | sbi->s_dmode; 1454 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1455 sbi->s_fmode != ISOFS_INVALID_MODE) 1456 inode->i_mode = S_IFREG | sbi->s_fmode; 1457 1458 /* Install the inode operations vector */ 1459 if (S_ISREG(inode->i_mode)) { 1460 inode->i_fop = &generic_ro_fops; 1461 switch (ei->i_file_format) { 1462 #ifdef CONFIG_ZISOFS 1463 case isofs_file_compressed: 1464 inode->i_data.a_ops = &zisofs_aops; 1465 break; 1466 #endif 1467 default: 1468 inode->i_data.a_ops = &isofs_aops; 1469 break; 1470 } 1471 } else if (S_ISDIR(inode->i_mode)) { 1472 inode->i_op = &isofs_dir_inode_operations; 1473 inode->i_fop = &isofs_dir_operations; 1474 } else if (S_ISLNK(inode->i_mode)) { 1475 inode->i_op = &page_symlink_inode_operations; 1476 inode_nohighmem(inode); 1477 inode->i_data.a_ops = &isofs_symlink_aops; 1478 } else 1479 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1480 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1481 1482 ret = 0; 1483 out: 1484 kfree(tmpde); 1485 if (bh) 1486 brelse(bh); 1487 return ret; 1488 1489 out_badread: 1490 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1491 fail: 1492 goto out; 1493 } 1494 1495 struct isofs_iget5_callback_data { 1496 unsigned long block; 1497 unsigned long offset; 1498 }; 1499 1500 static int isofs_iget5_test(struct inode *ino, void *data) 1501 { 1502 struct iso_inode_info *i = ISOFS_I(ino); 1503 struct isofs_iget5_callback_data *d = 1504 (struct isofs_iget5_callback_data*)data; 1505 return (i->i_iget5_block == d->block) 1506 && (i->i_iget5_offset == d->offset); 1507 } 1508 1509 static int isofs_iget5_set(struct inode *ino, void *data) 1510 { 1511 struct iso_inode_info *i = ISOFS_I(ino); 1512 struct isofs_iget5_callback_data *d = 1513 (struct isofs_iget5_callback_data*)data; 1514 i->i_iget5_block = d->block; 1515 i->i_iget5_offset = d->offset; 1516 return 0; 1517 } 1518 1519 /* Store, in the inode's containing structure, the block and block 1520 * offset that point to the underlying meta-data for the inode. The 1521 * code below is otherwise similar to the iget() code in 1522 * include/linux/fs.h */ 1523 struct inode *__isofs_iget(struct super_block *sb, 1524 unsigned long block, 1525 unsigned long offset, 1526 int relocated) 1527 { 1528 unsigned long hashval; 1529 struct inode *inode; 1530 struct isofs_iget5_callback_data data; 1531 long ret; 1532 1533 if (offset >= 1ul << sb->s_blocksize_bits) 1534 return ERR_PTR(-EINVAL); 1535 1536 data.block = block; 1537 data.offset = offset; 1538 1539 hashval = (block << sb->s_blocksize_bits) | offset; 1540 1541 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1542 &isofs_iget5_set, &data); 1543 1544 if (!inode) 1545 return ERR_PTR(-ENOMEM); 1546 1547 if (inode->i_state & I_NEW) { 1548 ret = isofs_read_inode(inode, relocated); 1549 if (ret < 0) { 1550 iget_failed(inode); 1551 inode = ERR_PTR(ret); 1552 } else { 1553 unlock_new_inode(inode); 1554 } 1555 } 1556 1557 return inode; 1558 } 1559 1560 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1561 int flags, const char *dev_name, void *data) 1562 { 1563 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1564 } 1565 1566 static struct file_system_type iso9660_fs_type = { 1567 .owner = THIS_MODULE, 1568 .name = "iso9660", 1569 .mount = isofs_mount, 1570 .kill_sb = kill_block_super, 1571 .fs_flags = FS_REQUIRES_DEV, 1572 }; 1573 MODULE_ALIAS_FS("iso9660"); 1574 MODULE_ALIAS("iso9660"); 1575 1576 static int __init init_iso9660_fs(void) 1577 { 1578 int err = init_inodecache(); 1579 if (err) 1580 goto out; 1581 #ifdef CONFIG_ZISOFS 1582 err = zisofs_init(); 1583 if (err) 1584 goto out1; 1585 #endif 1586 err = register_filesystem(&iso9660_fs_type); 1587 if (err) 1588 goto out2; 1589 return 0; 1590 out2: 1591 #ifdef CONFIG_ZISOFS 1592 zisofs_cleanup(); 1593 out1: 1594 #endif 1595 destroy_inodecache(); 1596 out: 1597 return err; 1598 } 1599 1600 static void __exit exit_iso9660_fs(void) 1601 { 1602 unregister_filesystem(&iso9660_fs_type); 1603 #ifdef CONFIG_ZISOFS 1604 zisofs_cleanup(); 1605 #endif 1606 destroy_inodecache(); 1607 } 1608 1609 module_init(init_iso9660_fs) 1610 module_exit(exit_iso9660_fs) 1611 MODULE_LICENSE("GPL"); 1612