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