1 /* 2 * linux/fs/isofs/inode.c 3 * 4 * (C) 1991 Linus Torvalds - minix filesystem 5 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem. 6 * 1994 Eberhard Mönkeberg - multi session handling. 7 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs. 8 * 1997 Gordon Chaffee - Joliet CDs 9 * 1998 Eric Lammerts - ISO 9660 Level 3 10 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB 11 * 2004 Paul Serice - NFS Export Operations 12 */ 13 14 #include <linux/init.h> 15 #include <linux/module.h> 16 17 #include <linux/slab.h> 18 #include <linux/nls.h> 19 #include <linux/ctype.h> 20 #include <linux/statfs.h> 21 #include <linux/cdrom.h> 22 #include <linux/parser.h> 23 #include <linux/mpage.h> 24 #include <linux/user_namespace.h> 25 26 #include "isofs.h" 27 #include "zisofs.h" 28 29 #define BEQUIET 30 31 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); 32 static int isofs_hash(const struct dentry *parent, struct qstr *qstr); 33 static int isofs_dentry_cmpi(const struct dentry *parent, 34 const struct dentry *dentry, 35 unsigned int len, const char *str, const struct qstr *name); 36 static int isofs_dentry_cmp(const struct dentry *parent, 37 const struct dentry *dentry, 38 unsigned int len, const char *str, const struct qstr *name); 39 40 #ifdef CONFIG_JOLIET 41 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); 42 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); 43 static int isofs_dentry_cmpi_ms(const struct dentry *parent, 44 const struct dentry *dentry, 45 unsigned int len, const char *str, const struct qstr *name); 46 static int isofs_dentry_cmp_ms(const struct dentry *parent, 47 const struct dentry *dentry, 48 unsigned int len, const char *str, const struct qstr *name); 49 #endif 50 51 static void isofs_put_super(struct super_block *sb) 52 { 53 struct isofs_sb_info *sbi = ISOFS_SB(sb); 54 55 #ifdef CONFIG_JOLIET 56 unload_nls(sbi->s_nls_iocharset); 57 #endif 58 59 kfree(sbi); 60 sb->s_fs_info = NULL; 61 return; 62 } 63 64 static int isofs_read_inode(struct inode *); 65 static int isofs_statfs (struct dentry *, struct kstatfs *); 66 67 static struct kmem_cache *isofs_inode_cachep; 68 69 static struct inode *isofs_alloc_inode(struct super_block *sb) 70 { 71 struct iso_inode_info *ei; 72 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); 73 if (!ei) 74 return NULL; 75 return &ei->vfs_inode; 76 } 77 78 static void isofs_i_callback(struct rcu_head *head) 79 { 80 struct inode *inode = container_of(head, struct inode, i_rcu); 81 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 82 } 83 84 static void isofs_destroy_inode(struct inode *inode) 85 { 86 call_rcu(&inode->i_rcu, isofs_i_callback); 87 } 88 89 static void init_once(void *foo) 90 { 91 struct iso_inode_info *ei = foo; 92 93 inode_init_once(&ei->vfs_inode); 94 } 95 96 static int init_inodecache(void) 97 { 98 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", 99 sizeof(struct iso_inode_info), 100 0, (SLAB_RECLAIM_ACCOUNT| 101 SLAB_MEM_SPREAD), 102 init_once); 103 if (isofs_inode_cachep == NULL) 104 return -ENOMEM; 105 return 0; 106 } 107 108 static void destroy_inodecache(void) 109 { 110 /* 111 * Make sure all delayed rcu free inodes are flushed before we 112 * destroy cache. 113 */ 114 rcu_barrier(); 115 kmem_cache_destroy(isofs_inode_cachep); 116 } 117 118 static int isofs_remount(struct super_block *sb, int *flags, char *data) 119 { 120 /* we probably want a lot more here */ 121 *flags |= MS_RDONLY; 122 return 0; 123 } 124 125 static const struct super_operations isofs_sops = { 126 .alloc_inode = isofs_alloc_inode, 127 .destroy_inode = isofs_destroy_inode, 128 .put_super = isofs_put_super, 129 .statfs = isofs_statfs, 130 .remount_fs = isofs_remount, 131 .show_options = generic_show_options, 132 }; 133 134 135 static const struct dentry_operations isofs_dentry_ops[] = { 136 { 137 .d_hash = isofs_hash, 138 .d_compare = isofs_dentry_cmp, 139 }, 140 { 141 .d_hash = isofs_hashi, 142 .d_compare = isofs_dentry_cmpi, 143 }, 144 #ifdef CONFIG_JOLIET 145 { 146 .d_hash = isofs_hash_ms, 147 .d_compare = isofs_dentry_cmp_ms, 148 }, 149 { 150 .d_hash = isofs_hashi_ms, 151 .d_compare = isofs_dentry_cmpi_ms, 152 }, 153 #endif 154 }; 155 156 struct iso9660_options{ 157 unsigned int rock:1; 158 unsigned int joliet:1; 159 unsigned int cruft:1; 160 unsigned int hide:1; 161 unsigned int showassoc:1; 162 unsigned int nocompress:1; 163 unsigned int overriderockperm:1; 164 unsigned int uid_set:1; 165 unsigned int gid_set:1; 166 unsigned int utf8:1; 167 unsigned char map; 168 unsigned char check; 169 unsigned int blocksize; 170 umode_t fmode; 171 umode_t dmode; 172 kgid_t gid; 173 kuid_t uid; 174 char *iocharset; 175 /* LVE */ 176 s32 session; 177 s32 sbsector; 178 }; 179 180 /* 181 * Compute the hash for the isofs name corresponding to the dentry. 182 */ 183 static int 184 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) 185 { 186 const char *name; 187 int len; 188 189 len = qstr->len; 190 name = qstr->name; 191 if (ms) { 192 while (len && name[len-1] == '.') 193 len--; 194 } 195 196 qstr->hash = full_name_hash(name, len); 197 198 return 0; 199 } 200 201 /* 202 * Compute the hash for the isofs name corresponding to the dentry. 203 */ 204 static int 205 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) 206 { 207 const char *name; 208 int len; 209 char c; 210 unsigned long hash; 211 212 len = qstr->len; 213 name = qstr->name; 214 if (ms) { 215 while (len && name[len-1] == '.') 216 len--; 217 } 218 219 hash = init_name_hash(); 220 while (len--) { 221 c = tolower(*name++); 222 hash = partial_name_hash(c, hash); 223 } 224 qstr->hash = end_name_hash(hash); 225 226 return 0; 227 } 228 229 /* 230 * Compare of two isofs names. 231 */ 232 static int isofs_dentry_cmp_common( 233 unsigned int len, const char *str, 234 const struct qstr *name, int ms, int ci) 235 { 236 int alen, blen; 237 238 /* A filename cannot end in '.' or we treat it like it has none */ 239 alen = name->len; 240 blen = len; 241 if (ms) { 242 while (alen && name->name[alen-1] == '.') 243 alen--; 244 while (blen && str[blen-1] == '.') 245 blen--; 246 } 247 if (alen == blen) { 248 if (ci) { 249 if (strnicmp(name->name, str, alen) == 0) 250 return 0; 251 } else { 252 if (strncmp(name->name, str, alen) == 0) 253 return 0; 254 } 255 } 256 return 1; 257 } 258 259 static int 260 isofs_hash(const struct dentry *dentry, struct qstr *qstr) 261 { 262 return isofs_hash_common(dentry, qstr, 0); 263 } 264 265 static int 266 isofs_hashi(const struct dentry *dentry, struct qstr *qstr) 267 { 268 return isofs_hashi_common(dentry, qstr, 0); 269 } 270 271 static int 272 isofs_dentry_cmp(const struct dentry *parent, const struct dentry *dentry, 273 unsigned int len, const char *str, const struct qstr *name) 274 { 275 return isofs_dentry_cmp_common(len, str, name, 0, 0); 276 } 277 278 static int 279 isofs_dentry_cmpi(const struct dentry *parent, const struct dentry *dentry, 280 unsigned int len, const char *str, const struct qstr *name) 281 { 282 return isofs_dentry_cmp_common(len, str, name, 0, 1); 283 } 284 285 #ifdef CONFIG_JOLIET 286 static int 287 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) 288 { 289 return isofs_hash_common(dentry, qstr, 1); 290 } 291 292 static int 293 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) 294 { 295 return isofs_hashi_common(dentry, qstr, 1); 296 } 297 298 static int 299 isofs_dentry_cmp_ms(const struct dentry *parent, const struct dentry *dentry, 300 unsigned int len, const char *str, const struct qstr *name) 301 { 302 return isofs_dentry_cmp_common(len, str, name, 1, 0); 303 } 304 305 static int 306 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry, 307 unsigned int len, const char *str, const struct qstr *name) 308 { 309 return isofs_dentry_cmp_common(len, str, name, 1, 1); 310 } 311 #endif 312 313 enum { 314 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, 315 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, 316 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, 317 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, 318 }; 319 320 static const match_table_t tokens = { 321 {Opt_norock, "norock"}, 322 {Opt_nojoliet, "nojoliet"}, 323 {Opt_unhide, "unhide"}, 324 {Opt_hide, "hide"}, 325 {Opt_showassoc, "showassoc"}, 326 {Opt_cruft, "cruft"}, 327 {Opt_utf8, "utf8"}, 328 {Opt_iocharset, "iocharset=%s"}, 329 {Opt_map_a, "map=acorn"}, 330 {Opt_map_a, "map=a"}, 331 {Opt_map_n, "map=normal"}, 332 {Opt_map_n, "map=n"}, 333 {Opt_map_o, "map=off"}, 334 {Opt_map_o, "map=o"}, 335 {Opt_session, "session=%u"}, 336 {Opt_sb, "sbsector=%u"}, 337 {Opt_check_r, "check=relaxed"}, 338 {Opt_check_r, "check=r"}, 339 {Opt_check_s, "check=strict"}, 340 {Opt_check_s, "check=s"}, 341 {Opt_uid, "uid=%u"}, 342 {Opt_gid, "gid=%u"}, 343 {Opt_mode, "mode=%u"}, 344 {Opt_dmode, "dmode=%u"}, 345 {Opt_overriderockperm, "overriderockperm"}, 346 {Opt_block, "block=%u"}, 347 {Opt_ignore, "conv=binary"}, 348 {Opt_ignore, "conv=b"}, 349 {Opt_ignore, "conv=text"}, 350 {Opt_ignore, "conv=t"}, 351 {Opt_ignore, "conv=mtext"}, 352 {Opt_ignore, "conv=m"}, 353 {Opt_ignore, "conv=auto"}, 354 {Opt_ignore, "conv=a"}, 355 {Opt_nocompress, "nocompress"}, 356 {Opt_err, NULL} 357 }; 358 359 static int parse_options(char *options, struct iso9660_options *popt) 360 { 361 char *p; 362 int option; 363 364 popt->map = 'n'; 365 popt->rock = 1; 366 popt->joliet = 1; 367 popt->cruft = 0; 368 popt->hide = 0; 369 popt->showassoc = 0; 370 popt->check = 'u'; /* unset */ 371 popt->nocompress = 0; 372 popt->blocksize = 1024; 373 popt->fmode = popt->dmode = ISOFS_INVALID_MODE; 374 popt->uid_set = 0; 375 popt->gid_set = 0; 376 popt->gid = GLOBAL_ROOT_GID; 377 popt->uid = GLOBAL_ROOT_UID; 378 popt->iocharset = NULL; 379 popt->utf8 = 0; 380 popt->overriderockperm = 0; 381 popt->session=-1; 382 popt->sbsector=-1; 383 if (!options) 384 return 1; 385 386 while ((p = strsep(&options, ",")) != NULL) { 387 int token; 388 substring_t args[MAX_OPT_ARGS]; 389 unsigned n; 390 391 if (!*p) 392 continue; 393 394 token = match_token(p, tokens, args); 395 switch (token) { 396 case Opt_norock: 397 popt->rock = 0; 398 break; 399 case Opt_nojoliet: 400 popt->joliet = 0; 401 break; 402 case Opt_hide: 403 popt->hide = 1; 404 break; 405 case Opt_unhide: 406 case Opt_showassoc: 407 popt->showassoc = 1; 408 break; 409 case Opt_cruft: 410 popt->cruft = 1; 411 break; 412 case Opt_utf8: 413 popt->utf8 = 1; 414 break; 415 #ifdef CONFIG_JOLIET 416 case Opt_iocharset: 417 popt->iocharset = match_strdup(&args[0]); 418 break; 419 #endif 420 case Opt_map_a: 421 popt->map = 'a'; 422 break; 423 case Opt_map_o: 424 popt->map = 'o'; 425 break; 426 case Opt_map_n: 427 popt->map = 'n'; 428 break; 429 case Opt_session: 430 if (match_int(&args[0], &option)) 431 return 0; 432 n = option; 433 if (n > 99) 434 return 0; 435 popt->session = n + 1; 436 break; 437 case Opt_sb: 438 if (match_int(&args[0], &option)) 439 return 0; 440 popt->sbsector = option; 441 break; 442 case Opt_check_r: 443 popt->check = 'r'; 444 break; 445 case Opt_check_s: 446 popt->check = 's'; 447 break; 448 case Opt_ignore: 449 break; 450 case Opt_uid: 451 if (match_int(&args[0], &option)) 452 return 0; 453 popt->uid = make_kuid(current_user_ns(), option); 454 if (!uid_valid(popt->uid)) 455 return 0; 456 popt->uid_set = 1; 457 break; 458 case Opt_gid: 459 if (match_int(&args[0], &option)) 460 return 0; 461 popt->gid = make_kgid(current_user_ns(), option); 462 if (!gid_valid(popt->gid)) 463 return 0; 464 popt->gid_set = 1; 465 break; 466 case Opt_mode: 467 if (match_int(&args[0], &option)) 468 return 0; 469 popt->fmode = option; 470 break; 471 case Opt_dmode: 472 if (match_int(&args[0], &option)) 473 return 0; 474 popt->dmode = option; 475 break; 476 case Opt_overriderockperm: 477 popt->overriderockperm = 1; 478 break; 479 case Opt_block: 480 if (match_int(&args[0], &option)) 481 return 0; 482 n = option; 483 if (n != 512 && n != 1024 && n != 2048) 484 return 0; 485 popt->blocksize = n; 486 break; 487 case Opt_nocompress: 488 popt->nocompress = 1; 489 break; 490 default: 491 return 0; 492 } 493 } 494 return 1; 495 } 496 497 /* 498 * look if the driver can tell the multi session redirection value 499 * 500 * don't change this if you don't know what you do, please! 501 * Multisession is legal only with XA disks. 502 * A non-XA disk with more than one volume descriptor may do it right, but 503 * usually is written in a nowhere standardized "multi-partition" manner. 504 * Multisession uses absolute addressing (solely the first frame of the whole 505 * track is #0), multi-partition uses relative addressing (each first frame of 506 * each track is #0), and a track is not a session. 507 * 508 * A broken CDwriter software or drive firmware does not set new standards, 509 * at least not if conflicting with the existing ones. 510 * 511 * emoenke@gwdg.de 512 */ 513 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 514 515 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 516 { 517 struct cdrom_multisession ms_info; 518 unsigned int vol_desc_start; 519 struct block_device *bdev = sb->s_bdev; 520 int i; 521 522 vol_desc_start=0; 523 ms_info.addr_format=CDROM_LBA; 524 if(session >= 0 && session <= 99) { 525 struct cdrom_tocentry Te; 526 Te.cdte_track=session; 527 Te.cdte_format=CDROM_LBA; 528 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); 529 if (!i) { 530 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 531 session, Te.cdte_addr.lba, 532 Te.cdte_ctrl&CDROM_DATA_TRACK); 533 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) 534 return Te.cdte_addr.lba; 535 } 536 537 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 538 } 539 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); 540 if (session > 0) 541 printk(KERN_ERR "ISOFS: Invalid session number\n"); 542 #if 0 543 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); 544 if (i==0) { 545 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); 546 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); 547 } 548 #endif 549 if (i==0) 550 #if WE_OBEY_THE_WRITTEN_STANDARDS 551 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ 552 #endif 553 vol_desc_start=ms_info.addr.lba; 554 return vol_desc_start; 555 } 556 557 /* 558 * Check if root directory is empty (has less than 3 files). 559 * 560 * Used to detect broken CDs where ISO root directory is empty but Joliet root 561 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 562 * (and Joliet used instead) or else no files would be visible. 563 */ 564 static bool rootdir_empty(struct super_block *sb, unsigned long block) 565 { 566 int offset = 0, files = 0, de_len; 567 struct iso_directory_record *de; 568 struct buffer_head *bh; 569 570 bh = sb_bread(sb, block); 571 if (!bh) 572 return true; 573 while (files < 3) { 574 de = (struct iso_directory_record *) (bh->b_data + offset); 575 de_len = *(unsigned char *) de; 576 if (de_len == 0) 577 break; 578 files++; 579 offset += de_len; 580 } 581 brelse(bh); 582 return files < 3; 583 } 584 585 /* 586 * Initialize the superblock and read the root inode. 587 * 588 * Note: a check_disk_change() has been done immediately prior 589 * to this call, so we don't need to check again. 590 */ 591 static int isofs_fill_super(struct super_block *s, void *data, int silent) 592 { 593 struct buffer_head *bh = NULL, *pri_bh = NULL; 594 struct hs_primary_descriptor *h_pri = NULL; 595 struct iso_primary_descriptor *pri = NULL; 596 struct iso_supplementary_descriptor *sec = NULL; 597 struct iso_directory_record *rootp; 598 struct inode *inode; 599 struct iso9660_options opt; 600 struct isofs_sb_info *sbi; 601 unsigned long first_data_zone; 602 int joliet_level = 0; 603 int iso_blknum, block; 604 int orig_zonesize; 605 int table, error = -EINVAL; 606 unsigned int vol_desc_start; 607 608 save_mount_options(s, data); 609 610 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 611 if (!sbi) 612 return -ENOMEM; 613 s->s_fs_info = sbi; 614 615 if (!parse_options((char *)data, &opt)) 616 goto out_freesbi; 617 618 /* 619 * First of all, get the hardware blocksize for this device. 620 * If we don't know what it is, or the hardware blocksize is 621 * larger than the blocksize the user specified, then use 622 * that value. 623 */ 624 /* 625 * What if bugger tells us to go beyond page size? 626 */ 627 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 628 629 sbi->s_high_sierra = 0; /* default is iso9660 */ 630 631 vol_desc_start = (opt.sbsector != -1) ? 632 opt.sbsector : isofs_get_last_session(s,opt.session); 633 634 for (iso_blknum = vol_desc_start+16; 635 iso_blknum < vol_desc_start+100; iso_blknum++) { 636 struct hs_volume_descriptor *hdp; 637 struct iso_volume_descriptor *vdp; 638 639 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 640 if (!(bh = sb_bread(s, block))) 641 goto out_no_read; 642 643 vdp = (struct iso_volume_descriptor *)bh->b_data; 644 hdp = (struct hs_volume_descriptor *)bh->b_data; 645 646 /* 647 * Due to the overlapping physical location of the descriptors, 648 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 649 * proper identification in this case, we first check for ISO. 650 */ 651 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 652 if (isonum_711(vdp->type) == ISO_VD_END) 653 break; 654 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 655 if (pri == NULL) { 656 pri = (struct iso_primary_descriptor *)vdp; 657 /* Save the buffer in case we need it ... */ 658 pri_bh = bh; 659 bh = NULL; 660 } 661 } 662 #ifdef CONFIG_JOLIET 663 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 664 sec = (struct iso_supplementary_descriptor *)vdp; 665 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 666 if (opt.joliet) { 667 if (sec->escape[2] == 0x40) 668 joliet_level = 1; 669 else if (sec->escape[2] == 0x43) 670 joliet_level = 2; 671 else if (sec->escape[2] == 0x45) 672 joliet_level = 3; 673 674 printk(KERN_DEBUG "ISO 9660 Extensions: " 675 "Microsoft Joliet Level %d\n", 676 joliet_level); 677 } 678 goto root_found; 679 } else { 680 /* Unknown supplementary volume descriptor */ 681 sec = NULL; 682 } 683 } 684 #endif 685 } else { 686 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 687 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 688 goto out_freebh; 689 690 sbi->s_high_sierra = 1; 691 opt.rock = 0; 692 h_pri = (struct hs_primary_descriptor *)vdp; 693 goto root_found; 694 } 695 } 696 697 /* Just skip any volume descriptors we don't recognize */ 698 699 brelse(bh); 700 bh = NULL; 701 } 702 /* 703 * If we fall through, either no volume descriptor was found, 704 * or else we passed a primary descriptor looking for others. 705 */ 706 if (!pri) 707 goto out_unknown_format; 708 brelse(bh); 709 bh = pri_bh; 710 pri_bh = NULL; 711 712 root_found: 713 714 if (joliet_level && (pri == NULL || !opt.rock)) { 715 /* This is the case of Joliet with the norock mount flag. 716 * A disc with both Joliet and Rock Ridge is handled later 717 */ 718 pri = (struct iso_primary_descriptor *) sec; 719 } 720 721 if(sbi->s_high_sierra){ 722 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 723 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 724 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 725 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 726 } else { 727 if (!pri) 728 goto out_freebh; 729 rootp = (struct iso_directory_record *) pri->root_directory_record; 730 sbi->s_nzones = isonum_733(pri->volume_space_size); 731 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 732 sbi->s_max_size = isonum_733(pri->volume_space_size); 733 } 734 735 sbi->s_ninodes = 0; /* No way to figure this out easily */ 736 737 orig_zonesize = sbi->s_log_zone_size; 738 /* 739 * If the zone size is smaller than the hardware sector size, 740 * this is a fatal error. This would occur if the disc drive 741 * had sectors that were 2048 bytes, but the filesystem had 742 * blocks that were 512 bytes (which should only very rarely 743 * happen.) 744 */ 745 if (orig_zonesize < opt.blocksize) 746 goto out_bad_size; 747 748 /* RDE: convert log zone size to bit shift */ 749 switch (sbi->s_log_zone_size) { 750 case 512: sbi->s_log_zone_size = 9; break; 751 case 1024: sbi->s_log_zone_size = 10; break; 752 case 2048: sbi->s_log_zone_size = 11; break; 753 754 default: 755 goto out_bad_zone_size; 756 } 757 758 s->s_magic = ISOFS_SUPER_MAGIC; 759 760 /* 761 * With multi-extent files, file size is only limited by the maximum 762 * size of a file system, which is 8 TB. 763 */ 764 s->s_maxbytes = 0x80000000000LL; 765 766 /* 767 * The CDROM is read-only, has no nodes (devices) on it, and since 768 * all of the files appear to be owned by root, we really do not want 769 * to allow suid. (suid or devices will not show up unless we have 770 * Rock Ridge extensions) 771 */ 772 773 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */; 774 775 /* Set this for reference. Its not currently used except on write 776 which we don't have .. */ 777 778 first_data_zone = isonum_733(rootp->extent) + 779 isonum_711(rootp->ext_attr_length); 780 sbi->s_firstdatazone = first_data_zone; 781 #ifndef BEQUIET 782 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 783 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 784 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 785 if(sbi->s_high_sierra) 786 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 787 #endif 788 789 /* 790 * If the Joliet level is set, we _may_ decide to use the 791 * secondary descriptor, but can't be sure until after we 792 * read the root inode. But before reading the root inode 793 * we may need to change the device blocksize, and would 794 * rather release the old buffer first. So, we cache the 795 * first_data_zone value from the secondary descriptor. 796 */ 797 if (joliet_level) { 798 pri = (struct iso_primary_descriptor *) sec; 799 rootp = (struct iso_directory_record *) 800 pri->root_directory_record; 801 first_data_zone = isonum_733(rootp->extent) + 802 isonum_711(rootp->ext_attr_length); 803 } 804 805 /* 806 * We're all done using the volume descriptor, and may need 807 * to change the device blocksize, so release the buffer now. 808 */ 809 brelse(pri_bh); 810 brelse(bh); 811 812 /* 813 * Force the blocksize to 512 for 512 byte sectors. The file 814 * read primitives really get it wrong in a bad way if we don't 815 * do this. 816 * 817 * Note - we should never be setting the blocksize to something 818 * less than the hardware sector size for the device. If we 819 * do, we would end up having to read larger buffers and split 820 * out portions to satisfy requests. 821 * 822 * Note2- the idea here is that we want to deal with the optimal 823 * zonesize in the filesystem. If we have it set to something less, 824 * then we have horrible problems with trying to piece together 825 * bits of adjacent blocks in order to properly read directory 826 * entries. By forcing the blocksize in this way, we ensure 827 * that we will never be required to do this. 828 */ 829 sb_set_blocksize(s, orig_zonesize); 830 831 sbi->s_nls_iocharset = NULL; 832 833 #ifdef CONFIG_JOLIET 834 if (joliet_level && opt.utf8 == 0) { 835 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 836 sbi->s_nls_iocharset = load_nls(p); 837 if (! sbi->s_nls_iocharset) { 838 /* Fail only if explicit charset specified */ 839 if (opt.iocharset) 840 goto out_freesbi; 841 sbi->s_nls_iocharset = load_nls_default(); 842 } 843 } 844 #endif 845 s->s_op = &isofs_sops; 846 s->s_export_op = &isofs_export_ops; 847 sbi->s_mapping = opt.map; 848 sbi->s_rock = (opt.rock ? 2 : 0); 849 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 850 sbi->s_cruft = opt.cruft; 851 sbi->s_hide = opt.hide; 852 sbi->s_showassoc = opt.showassoc; 853 sbi->s_uid = opt.uid; 854 sbi->s_gid = opt.gid; 855 sbi->s_uid_set = opt.uid_set; 856 sbi->s_gid_set = opt.gid_set; 857 sbi->s_utf8 = opt.utf8; 858 sbi->s_nocompress = opt.nocompress; 859 sbi->s_overriderockperm = opt.overriderockperm; 860 /* 861 * It would be incredibly stupid to allow people to mark every file 862 * on the disk as suid, so we merely allow them to set the default 863 * permissions. 864 */ 865 if (opt.fmode != ISOFS_INVALID_MODE) 866 sbi->s_fmode = opt.fmode & 0777; 867 else 868 sbi->s_fmode = ISOFS_INVALID_MODE; 869 if (opt.dmode != ISOFS_INVALID_MODE) 870 sbi->s_dmode = opt.dmode & 0777; 871 else 872 sbi->s_dmode = ISOFS_INVALID_MODE; 873 874 /* 875 * Read the root inode, which _may_ result in changing 876 * the s_rock flag. Once we have the final s_rock value, 877 * we then decide whether to use the Joliet descriptor. 878 */ 879 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 880 if (IS_ERR(inode)) 881 goto out_no_root; 882 883 /* 884 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 885 * correct Joliet root directory. 886 */ 887 if (sbi->s_rock == 1 && joliet_level && 888 rootdir_empty(s, sbi->s_firstdatazone)) { 889 printk(KERN_NOTICE 890 "ISOFS: primary root directory is empty. " 891 "Disabling Rock Ridge and switching to Joliet."); 892 sbi->s_rock = 0; 893 } 894 895 /* 896 * If this disk has both Rock Ridge and Joliet on it, then we 897 * want to use Rock Ridge by default. This can be overridden 898 * by using the norock mount option. There is still one other 899 * possibility that is not taken into account: a Rock Ridge 900 * CD with Unicode names. Until someone sees such a beast, it 901 * will not be supported. 902 */ 903 if (sbi->s_rock == 1) { 904 joliet_level = 0; 905 } else if (joliet_level) { 906 sbi->s_rock = 0; 907 if (sbi->s_firstdatazone != first_data_zone) { 908 sbi->s_firstdatazone = first_data_zone; 909 printk(KERN_DEBUG 910 "ISOFS: changing to secondary root\n"); 911 iput(inode); 912 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 913 if (IS_ERR(inode)) 914 goto out_no_root; 915 } 916 } 917 918 if (opt.check == 'u') { 919 /* Only Joliet is case insensitive by default */ 920 if (joliet_level) 921 opt.check = 'r'; 922 else 923 opt.check = 's'; 924 } 925 sbi->s_joliet_level = joliet_level; 926 927 /* Make sure the root inode is a directory */ 928 if (!S_ISDIR(inode->i_mode)) { 929 printk(KERN_WARNING 930 "isofs_fill_super: root inode is not a directory. " 931 "Corrupted media?\n"); 932 goto out_iput; 933 } 934 935 table = 0; 936 if (joliet_level) 937 table += 2; 938 if (opt.check == 'r') 939 table++; 940 941 s->s_d_op = &isofs_dentry_ops[table]; 942 943 /* get the root dentry */ 944 s->s_root = d_make_root(inode); 945 if (!(s->s_root)) { 946 error = -ENOMEM; 947 goto out_no_inode; 948 } 949 950 kfree(opt.iocharset); 951 952 return 0; 953 954 /* 955 * Display error messages and free resources. 956 */ 957 out_iput: 958 iput(inode); 959 goto out_no_inode; 960 out_no_root: 961 error = PTR_ERR(inode); 962 if (error != -ENOMEM) 963 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 964 out_no_inode: 965 #ifdef CONFIG_JOLIET 966 unload_nls(sbi->s_nls_iocharset); 967 #endif 968 goto out_freesbi; 969 out_no_read: 970 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 971 __func__, s->s_id, iso_blknum, block); 972 goto out_freebh; 973 out_bad_zone_size: 974 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 975 sbi->s_log_zone_size); 976 goto out_freebh; 977 out_bad_size: 978 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 979 orig_zonesize, opt.blocksize); 980 goto out_freebh; 981 out_unknown_format: 982 if (!silent) 983 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 984 985 out_freebh: 986 brelse(bh); 987 brelse(pri_bh); 988 out_freesbi: 989 kfree(opt.iocharset); 990 kfree(sbi); 991 s->s_fs_info = NULL; 992 return error; 993 } 994 995 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 996 { 997 struct super_block *sb = dentry->d_sb; 998 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 999 1000 buf->f_type = ISOFS_SUPER_MAGIC; 1001 buf->f_bsize = sb->s_blocksize; 1002 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1003 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1004 buf->f_bfree = 0; 1005 buf->f_bavail = 0; 1006 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1007 buf->f_ffree = 0; 1008 buf->f_fsid.val[0] = (u32)id; 1009 buf->f_fsid.val[1] = (u32)(id >> 32); 1010 buf->f_namelen = NAME_MAX; 1011 return 0; 1012 } 1013 1014 /* 1015 * Get a set of blocks; filling in buffer_heads if already allocated 1016 * or getblk() if they are not. Returns the number of blocks inserted 1017 * (-ve == error.) 1018 */ 1019 int isofs_get_blocks(struct inode *inode, sector_t iblock, 1020 struct buffer_head **bh, unsigned long nblocks) 1021 { 1022 unsigned long b_off = iblock; 1023 unsigned offset, sect_size; 1024 unsigned int firstext; 1025 unsigned long nextblk, nextoff; 1026 int section, rv, error; 1027 struct iso_inode_info *ei = ISOFS_I(inode); 1028 1029 error = -EIO; 1030 rv = 0; 1031 if (iblock != b_off) { 1032 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1033 goto abort; 1034 } 1035 1036 1037 offset = 0; 1038 firstext = ei->i_first_extent; 1039 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1040 nextblk = ei->i_next_section_block; 1041 nextoff = ei->i_next_section_offset; 1042 section = 0; 1043 1044 while (nblocks) { 1045 /* If we are *way* beyond the end of the file, print a message. 1046 * Access beyond the end of the file up to the next page boundary 1047 * is normal, however because of the way the page cache works. 1048 * In this case, we just return 0 so that we can properly fill 1049 * the page with useless information without generating any 1050 * I/O errors. 1051 */ 1052 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1053 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1054 __func__, b_off, 1055 (unsigned long long)inode->i_size); 1056 goto abort; 1057 } 1058 1059 /* On the last section, nextblk == 0, section size is likely to 1060 * exceed sect_size by a partial block, and access beyond the 1061 * end of the file will reach beyond the section size, too. 1062 */ 1063 while (nextblk && (b_off >= (offset + sect_size))) { 1064 struct inode *ninode; 1065 1066 offset += sect_size; 1067 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1068 if (IS_ERR(ninode)) { 1069 error = PTR_ERR(ninode); 1070 goto abort; 1071 } 1072 firstext = ISOFS_I(ninode)->i_first_extent; 1073 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1074 nextblk = ISOFS_I(ninode)->i_next_section_block; 1075 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1076 iput(ninode); 1077 1078 if (++section > 100) { 1079 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1080 " aborting...\n", __func__); 1081 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1082 "nextblk=%lu nextoff=%lu\n", __func__, 1083 b_off, firstext, (unsigned) sect_size, 1084 nextblk, nextoff); 1085 goto abort; 1086 } 1087 } 1088 1089 if (*bh) { 1090 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1091 } else { 1092 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1093 if (!*bh) 1094 goto abort; 1095 } 1096 bh++; /* Next buffer head */ 1097 b_off++; /* Next buffer offset */ 1098 nblocks--; 1099 rv++; 1100 } 1101 1102 error = 0; 1103 abort: 1104 return rv != 0 ? rv : error; 1105 } 1106 1107 /* 1108 * Used by the standard interfaces. 1109 */ 1110 static int isofs_get_block(struct inode *inode, sector_t iblock, 1111 struct buffer_head *bh_result, int create) 1112 { 1113 int ret; 1114 1115 if (create) { 1116 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1117 return -EROFS; 1118 } 1119 1120 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1121 return ret < 0 ? ret : 0; 1122 } 1123 1124 static int isofs_bmap(struct inode *inode, sector_t block) 1125 { 1126 struct buffer_head dummy; 1127 int error; 1128 1129 dummy.b_state = 0; 1130 dummy.b_blocknr = -1000; 1131 error = isofs_get_block(inode, block, &dummy, 0); 1132 if (!error) 1133 return dummy.b_blocknr; 1134 return 0; 1135 } 1136 1137 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1138 { 1139 sector_t blknr = isofs_bmap(inode, block); 1140 if (!blknr) 1141 return NULL; 1142 return sb_bread(inode->i_sb, blknr); 1143 } 1144 1145 static int isofs_readpage(struct file *file, struct page *page) 1146 { 1147 return mpage_readpage(page, isofs_get_block); 1148 } 1149 1150 static int isofs_readpages(struct file *file, struct address_space *mapping, 1151 struct list_head *pages, unsigned nr_pages) 1152 { 1153 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); 1154 } 1155 1156 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1157 { 1158 return generic_block_bmap(mapping,block,isofs_get_block); 1159 } 1160 1161 static const struct address_space_operations isofs_aops = { 1162 .readpage = isofs_readpage, 1163 .readpages = isofs_readpages, 1164 .bmap = _isofs_bmap 1165 }; 1166 1167 static int isofs_read_level3_size(struct inode *inode) 1168 { 1169 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1170 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1171 struct buffer_head *bh = NULL; 1172 unsigned long block, offset, block_saved, offset_saved; 1173 int i = 0; 1174 int more_entries = 0; 1175 struct iso_directory_record *tmpde = NULL; 1176 struct iso_inode_info *ei = ISOFS_I(inode); 1177 1178 inode->i_size = 0; 1179 1180 /* The first 16 blocks are reserved as the System Area. Thus, 1181 * no inodes can appear in block 0. We use this to flag that 1182 * this is the last section. */ 1183 ei->i_next_section_block = 0; 1184 ei->i_next_section_offset = 0; 1185 1186 block = ei->i_iget5_block; 1187 offset = ei->i_iget5_offset; 1188 1189 do { 1190 struct iso_directory_record *de; 1191 unsigned int de_len; 1192 1193 if (!bh) { 1194 bh = sb_bread(inode->i_sb, block); 1195 if (!bh) 1196 goto out_noread; 1197 } 1198 de = (struct iso_directory_record *) (bh->b_data + offset); 1199 de_len = *(unsigned char *) de; 1200 1201 if (de_len == 0) { 1202 brelse(bh); 1203 bh = NULL; 1204 ++block; 1205 offset = 0; 1206 continue; 1207 } 1208 1209 block_saved = block; 1210 offset_saved = offset; 1211 offset += de_len; 1212 1213 /* Make sure we have a full directory entry */ 1214 if (offset >= bufsize) { 1215 int slop = bufsize - offset + de_len; 1216 if (!tmpde) { 1217 tmpde = kmalloc(256, GFP_KERNEL); 1218 if (!tmpde) 1219 goto out_nomem; 1220 } 1221 memcpy(tmpde, de, slop); 1222 offset &= bufsize - 1; 1223 block++; 1224 brelse(bh); 1225 bh = NULL; 1226 if (offset) { 1227 bh = sb_bread(inode->i_sb, block); 1228 if (!bh) 1229 goto out_noread; 1230 memcpy((void *)tmpde+slop, bh->b_data, offset); 1231 } 1232 de = tmpde; 1233 } 1234 1235 inode->i_size += isonum_733(de->size); 1236 if (i == 1) { 1237 ei->i_next_section_block = block_saved; 1238 ei->i_next_section_offset = offset_saved; 1239 } 1240 1241 more_entries = de->flags[-high_sierra] & 0x80; 1242 1243 i++; 1244 if (i > 100) 1245 goto out_toomany; 1246 } while (more_entries); 1247 out: 1248 kfree(tmpde); 1249 if (bh) 1250 brelse(bh); 1251 return 0; 1252 1253 out_nomem: 1254 if (bh) 1255 brelse(bh); 1256 return -ENOMEM; 1257 1258 out_noread: 1259 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1260 kfree(tmpde); 1261 return -EIO; 1262 1263 out_toomany: 1264 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1265 "isofs_read_level3_size: inode=%lu\n", 1266 __func__, inode->i_ino); 1267 goto out; 1268 } 1269 1270 static int isofs_read_inode(struct inode *inode) 1271 { 1272 struct super_block *sb = inode->i_sb; 1273 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1274 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1275 unsigned long block; 1276 int high_sierra = sbi->s_high_sierra; 1277 struct buffer_head *bh = NULL; 1278 struct iso_directory_record *de; 1279 struct iso_directory_record *tmpde = NULL; 1280 unsigned int de_len; 1281 unsigned long offset; 1282 struct iso_inode_info *ei = ISOFS_I(inode); 1283 int ret = -EIO; 1284 1285 block = ei->i_iget5_block; 1286 bh = sb_bread(inode->i_sb, block); 1287 if (!bh) 1288 goto out_badread; 1289 1290 offset = ei->i_iget5_offset; 1291 1292 de = (struct iso_directory_record *) (bh->b_data + offset); 1293 de_len = *(unsigned char *) de; 1294 1295 if (offset + de_len > bufsize) { 1296 int frag1 = bufsize - offset; 1297 1298 tmpde = kmalloc(de_len, GFP_KERNEL); 1299 if (tmpde == NULL) { 1300 printk(KERN_INFO "%s: out of memory\n", __func__); 1301 ret = -ENOMEM; 1302 goto fail; 1303 } 1304 memcpy(tmpde, bh->b_data + offset, frag1); 1305 brelse(bh); 1306 bh = sb_bread(inode->i_sb, ++block); 1307 if (!bh) 1308 goto out_badread; 1309 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1310 de = tmpde; 1311 } 1312 1313 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1314 ei->i_iget5_offset, 1315 ISOFS_BUFFER_BITS(inode)); 1316 1317 /* Assume it is a normal-format file unless told otherwise */ 1318 ei->i_file_format = isofs_file_normal; 1319 1320 if (de->flags[-high_sierra] & 2) { 1321 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1322 inode->i_mode = S_IFDIR | sbi->s_dmode; 1323 else 1324 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1325 set_nlink(inode, 1); /* 1326 * Set to 1. We know there are 2, but 1327 * the find utility tries to optimize 1328 * if it is 2, and it screws up. It is 1329 * easier to give 1 which tells find to 1330 * do it the hard way. 1331 */ 1332 } else { 1333 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1334 inode->i_mode = S_IFREG | sbi->s_fmode; 1335 } else { 1336 /* 1337 * Set default permissions: r-x for all. The disc 1338 * could be shared with DOS machines so virtually 1339 * anything could be a valid executable. 1340 */ 1341 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1342 } 1343 set_nlink(inode, 1); 1344 } 1345 inode->i_uid = sbi->s_uid; 1346 inode->i_gid = sbi->s_gid; 1347 inode->i_blocks = 0; 1348 1349 ei->i_format_parm[0] = 0; 1350 ei->i_format_parm[1] = 0; 1351 ei->i_format_parm[2] = 0; 1352 1353 ei->i_section_size = isonum_733(de->size); 1354 if (de->flags[-high_sierra] & 0x80) { 1355 ret = isofs_read_level3_size(inode); 1356 if (ret < 0) 1357 goto fail; 1358 ret = -EIO; 1359 } else { 1360 ei->i_next_section_block = 0; 1361 ei->i_next_section_offset = 0; 1362 inode->i_size = isonum_733(de->size); 1363 } 1364 1365 /* 1366 * Some dipshit decided to store some other bit of information 1367 * in the high byte of the file length. Truncate size in case 1368 * this CDROM was mounted with the cruft option. 1369 */ 1370 1371 if (sbi->s_cruft) 1372 inode->i_size &= 0x00ffffff; 1373 1374 if (de->interleave[0]) { 1375 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1376 inode->i_size = 0; 1377 } 1378 1379 /* I have no idea what file_unit_size is used for, so 1380 we will flag it for now */ 1381 if (de->file_unit_size[0] != 0) { 1382 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1383 inode->i_ino); 1384 } 1385 1386 /* I have no idea what other flag bits are used for, so 1387 we will flag it for now */ 1388 #ifdef DEBUG 1389 if((de->flags[-high_sierra] & ~2)!= 0){ 1390 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1391 "(%ld %x).\n", 1392 inode->i_ino, de->flags[-high_sierra]); 1393 } 1394 #endif 1395 1396 inode->i_mtime.tv_sec = 1397 inode->i_atime.tv_sec = 1398 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1399 inode->i_mtime.tv_nsec = 1400 inode->i_atime.tv_nsec = 1401 inode->i_ctime.tv_nsec = 0; 1402 1403 ei->i_first_extent = (isonum_733(de->extent) + 1404 isonum_711(de->ext_attr_length)); 1405 1406 /* Set the number of blocks for stat() - should be done before RR */ 1407 inode->i_blocks = (inode->i_size + 511) >> 9; 1408 1409 /* 1410 * Now test for possible Rock Ridge extensions which will override 1411 * some of these numbers in the inode structure. 1412 */ 1413 1414 if (!high_sierra) { 1415 parse_rock_ridge_inode(de, inode); 1416 /* if we want uid/gid set, override the rock ridge setting */ 1417 if (sbi->s_uid_set) 1418 inode->i_uid = sbi->s_uid; 1419 if (sbi->s_gid_set) 1420 inode->i_gid = sbi->s_gid; 1421 } 1422 /* Now set final access rights if overriding rock ridge setting */ 1423 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1424 sbi->s_dmode != ISOFS_INVALID_MODE) 1425 inode->i_mode = S_IFDIR | sbi->s_dmode; 1426 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1427 sbi->s_fmode != ISOFS_INVALID_MODE) 1428 inode->i_mode = S_IFREG | sbi->s_fmode; 1429 1430 /* Install the inode operations vector */ 1431 if (S_ISREG(inode->i_mode)) { 1432 inode->i_fop = &generic_ro_fops; 1433 switch (ei->i_file_format) { 1434 #ifdef CONFIG_ZISOFS 1435 case isofs_file_compressed: 1436 inode->i_data.a_ops = &zisofs_aops; 1437 break; 1438 #endif 1439 default: 1440 inode->i_data.a_ops = &isofs_aops; 1441 break; 1442 } 1443 } else if (S_ISDIR(inode->i_mode)) { 1444 inode->i_op = &isofs_dir_inode_operations; 1445 inode->i_fop = &isofs_dir_operations; 1446 } else if (S_ISLNK(inode->i_mode)) { 1447 inode->i_op = &page_symlink_inode_operations; 1448 inode->i_data.a_ops = &isofs_symlink_aops; 1449 } else 1450 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1451 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1452 1453 ret = 0; 1454 out: 1455 kfree(tmpde); 1456 if (bh) 1457 brelse(bh); 1458 return ret; 1459 1460 out_badread: 1461 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1462 fail: 1463 goto out; 1464 } 1465 1466 struct isofs_iget5_callback_data { 1467 unsigned long block; 1468 unsigned long offset; 1469 }; 1470 1471 static int isofs_iget5_test(struct inode *ino, void *data) 1472 { 1473 struct iso_inode_info *i = ISOFS_I(ino); 1474 struct isofs_iget5_callback_data *d = 1475 (struct isofs_iget5_callback_data*)data; 1476 return (i->i_iget5_block == d->block) 1477 && (i->i_iget5_offset == d->offset); 1478 } 1479 1480 static int isofs_iget5_set(struct inode *ino, void *data) 1481 { 1482 struct iso_inode_info *i = ISOFS_I(ino); 1483 struct isofs_iget5_callback_data *d = 1484 (struct isofs_iget5_callback_data*)data; 1485 i->i_iget5_block = d->block; 1486 i->i_iget5_offset = d->offset; 1487 return 0; 1488 } 1489 1490 /* Store, in the inode's containing structure, the block and block 1491 * offset that point to the underlying meta-data for the inode. The 1492 * code below is otherwise similar to the iget() code in 1493 * include/linux/fs.h */ 1494 struct inode *isofs_iget(struct super_block *sb, 1495 unsigned long block, 1496 unsigned long offset) 1497 { 1498 unsigned long hashval; 1499 struct inode *inode; 1500 struct isofs_iget5_callback_data data; 1501 long ret; 1502 1503 if (offset >= 1ul << sb->s_blocksize_bits) 1504 return ERR_PTR(-EINVAL); 1505 1506 data.block = block; 1507 data.offset = offset; 1508 1509 hashval = (block << sb->s_blocksize_bits) | offset; 1510 1511 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1512 &isofs_iget5_set, &data); 1513 1514 if (!inode) 1515 return ERR_PTR(-ENOMEM); 1516 1517 if (inode->i_state & I_NEW) { 1518 ret = isofs_read_inode(inode); 1519 if (ret < 0) { 1520 iget_failed(inode); 1521 inode = ERR_PTR(ret); 1522 } else { 1523 unlock_new_inode(inode); 1524 } 1525 } 1526 1527 return inode; 1528 } 1529 1530 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1531 int flags, const char *dev_name, void *data) 1532 { 1533 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1534 } 1535 1536 static struct file_system_type iso9660_fs_type = { 1537 .owner = THIS_MODULE, 1538 .name = "iso9660", 1539 .mount = isofs_mount, 1540 .kill_sb = kill_block_super, 1541 .fs_flags = FS_REQUIRES_DEV, 1542 }; 1543 MODULE_ALIAS_FS("iso9660"); 1544 MODULE_ALIAS("iso9660"); 1545 1546 static int __init init_iso9660_fs(void) 1547 { 1548 int err = init_inodecache(); 1549 if (err) 1550 goto out; 1551 #ifdef CONFIG_ZISOFS 1552 err = zisofs_init(); 1553 if (err) 1554 goto out1; 1555 #endif 1556 err = register_filesystem(&iso9660_fs_type); 1557 if (err) 1558 goto out2; 1559 return 0; 1560 out2: 1561 #ifdef CONFIG_ZISOFS 1562 zisofs_cleanup(); 1563 out1: 1564 #endif 1565 destroy_inodecache(); 1566 out: 1567 return err; 1568 } 1569 1570 static void __exit exit_iso9660_fs(void) 1571 { 1572 unregister_filesystem(&iso9660_fs_type); 1573 #ifdef CONFIG_ZISOFS 1574 zisofs_cleanup(); 1575 #endif 1576 destroy_inodecache(); 1577 } 1578 1579 module_init(init_iso9660_fs) 1580 module_exit(exit_iso9660_fs) 1581 MODULE_LICENSE("GPL"); 1582