1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/isofs/inode.c 4 * 5 * (C) 1991 Linus Torvalds - minix filesystem 6 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem. 7 * 1994 Eberhard Mönkeberg - multi session handling. 8 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs. 9 * 1997 Gordon Chaffee - Joliet CDs 10 * 1998 Eric Lammerts - ISO 9660 Level 3 11 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB 12 * 2004 Paul Serice - NFS Export Operations 13 */ 14 15 #include <linux/init.h> 16 #include <linux/module.h> 17 18 #include <linux/slab.h> 19 #include <linux/cred.h> 20 #include <linux/nls.h> 21 #include <linux/ctype.h> 22 #include <linux/statfs.h> 23 #include <linux/cdrom.h> 24 #include <linux/parser.h> 25 #include <linux/mpage.h> 26 #include <linux/user_namespace.h> 27 #include <linux/seq_file.h> 28 #include <linux/blkdev.h> 29 30 #include "isofs.h" 31 #include "zisofs.h" 32 33 /* max tz offset is 13 hours */ 34 #define MAX_TZ_OFFSET (52*15*60) 35 36 #define BEQUIET 37 38 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); 39 static int isofs_dentry_cmpi(const struct dentry *dentry, 40 unsigned int len, const char *str, const struct qstr *name); 41 42 #ifdef CONFIG_JOLIET 43 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); 44 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); 45 static int isofs_dentry_cmpi_ms(const struct dentry *dentry, 46 unsigned int len, const char *str, const struct qstr *name); 47 static int isofs_dentry_cmp_ms(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 *, int relocated); 65 static int isofs_statfs (struct dentry *, struct kstatfs *); 66 static int isofs_show_options(struct seq_file *, struct dentry *); 67 68 static struct kmem_cache *isofs_inode_cachep; 69 70 static struct inode *isofs_alloc_inode(struct super_block *sb) 71 { 72 struct iso_inode_info *ei; 73 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); 74 if (!ei) 75 return NULL; 76 return &ei->vfs_inode; 77 } 78 79 static void isofs_free_inode(struct inode *inode) 80 { 81 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 82 } 83 84 static void init_once(void *foo) 85 { 86 struct iso_inode_info *ei = foo; 87 88 inode_init_once(&ei->vfs_inode); 89 } 90 91 static int __init init_inodecache(void) 92 { 93 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", 94 sizeof(struct iso_inode_info), 95 0, (SLAB_RECLAIM_ACCOUNT| 96 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 97 init_once); 98 if (!isofs_inode_cachep) 99 return -ENOMEM; 100 return 0; 101 } 102 103 static void destroy_inodecache(void) 104 { 105 /* 106 * Make sure all delayed rcu free inodes are flushed before we 107 * destroy cache. 108 */ 109 rcu_barrier(); 110 kmem_cache_destroy(isofs_inode_cachep); 111 } 112 113 static int isofs_remount(struct super_block *sb, int *flags, char *data) 114 { 115 sync_filesystem(sb); 116 if (!(*flags & SB_RDONLY)) 117 return -EROFS; 118 return 0; 119 } 120 121 static const struct super_operations isofs_sops = { 122 .alloc_inode = isofs_alloc_inode, 123 .free_inode = isofs_free_inode, 124 .put_super = isofs_put_super, 125 .statfs = isofs_statfs, 126 .remount_fs = isofs_remount, 127 .show_options = isofs_show_options, 128 }; 129 130 131 static const struct dentry_operations isofs_dentry_ops[] = { 132 { 133 .d_hash = isofs_hashi, 134 .d_compare = isofs_dentry_cmpi, 135 }, 136 #ifdef CONFIG_JOLIET 137 { 138 .d_hash = isofs_hash_ms, 139 .d_compare = isofs_dentry_cmp_ms, 140 }, 141 { 142 .d_hash = isofs_hashi_ms, 143 .d_compare = isofs_dentry_cmpi_ms, 144 }, 145 #endif 146 }; 147 148 struct iso9660_options{ 149 unsigned int rock:1; 150 unsigned int joliet:1; 151 unsigned int cruft:1; 152 unsigned int hide:1; 153 unsigned int showassoc:1; 154 unsigned int nocompress:1; 155 unsigned int overriderockperm:1; 156 unsigned int uid_set:1; 157 unsigned int gid_set:1; 158 unsigned int utf8:1; 159 unsigned char map; 160 unsigned char check; 161 unsigned int blocksize; 162 umode_t fmode; 163 umode_t dmode; 164 kgid_t gid; 165 kuid_t uid; 166 char *iocharset; 167 /* LVE */ 168 s32 session; 169 s32 sbsector; 170 }; 171 172 /* 173 * Compute the hash for the isofs name corresponding to the dentry. 174 */ 175 static int 176 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) 177 { 178 const char *name; 179 int len; 180 char c; 181 unsigned long hash; 182 183 len = qstr->len; 184 name = qstr->name; 185 if (ms) { 186 while (len && name[len-1] == '.') 187 len--; 188 } 189 190 hash = init_name_hash(dentry); 191 while (len--) { 192 c = tolower(*name++); 193 hash = partial_name_hash(c, hash); 194 } 195 qstr->hash = end_name_hash(hash); 196 197 return 0; 198 } 199 200 /* 201 * Compare of two isofs names. 202 */ 203 static int isofs_dentry_cmp_common( 204 unsigned int len, const char *str, 205 const struct qstr *name, int ms, int ci) 206 { 207 int alen, blen; 208 209 /* A filename cannot end in '.' or we treat it like it has none */ 210 alen = name->len; 211 blen = len; 212 if (ms) { 213 while (alen && name->name[alen-1] == '.') 214 alen--; 215 while (blen && str[blen-1] == '.') 216 blen--; 217 } 218 if (alen == blen) { 219 if (ci) { 220 if (strncasecmp(name->name, str, alen) == 0) 221 return 0; 222 } else { 223 if (strncmp(name->name, str, alen) == 0) 224 return 0; 225 } 226 } 227 return 1; 228 } 229 230 static int 231 isofs_hashi(const struct dentry *dentry, struct qstr *qstr) 232 { 233 return isofs_hashi_common(dentry, qstr, 0); 234 } 235 236 static int 237 isofs_dentry_cmpi(const struct dentry *dentry, 238 unsigned int len, const char *str, const struct qstr *name) 239 { 240 return isofs_dentry_cmp_common(len, str, name, 0, 1); 241 } 242 243 #ifdef CONFIG_JOLIET 244 /* 245 * Compute the hash for the isofs name corresponding to the dentry. 246 */ 247 static int 248 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) 249 { 250 const char *name; 251 int len; 252 253 len = qstr->len; 254 name = qstr->name; 255 if (ms) { 256 while (len && name[len-1] == '.') 257 len--; 258 } 259 260 qstr->hash = full_name_hash(dentry, name, len); 261 262 return 0; 263 } 264 265 static int 266 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) 267 { 268 return isofs_hash_common(dentry, qstr, 1); 269 } 270 271 static int 272 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) 273 { 274 return isofs_hashi_common(dentry, qstr, 1); 275 } 276 277 static int 278 isofs_dentry_cmp_ms(const struct dentry *dentry, 279 unsigned int len, const char *str, const struct qstr *name) 280 { 281 return isofs_dentry_cmp_common(len, str, name, 1, 0); 282 } 283 284 static int 285 isofs_dentry_cmpi_ms(const struct dentry *dentry, 286 unsigned int len, const char *str, const struct qstr *name) 287 { 288 return isofs_dentry_cmp_common(len, str, name, 1, 1); 289 } 290 #endif 291 292 enum { 293 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, 294 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, 295 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, 296 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, 297 }; 298 299 static const match_table_t tokens = { 300 {Opt_norock, "norock"}, 301 {Opt_nojoliet, "nojoliet"}, 302 {Opt_unhide, "unhide"}, 303 {Opt_hide, "hide"}, 304 {Opt_showassoc, "showassoc"}, 305 {Opt_cruft, "cruft"}, 306 {Opt_utf8, "utf8"}, 307 {Opt_iocharset, "iocharset=%s"}, 308 {Opt_map_a, "map=acorn"}, 309 {Opt_map_a, "map=a"}, 310 {Opt_map_n, "map=normal"}, 311 {Opt_map_n, "map=n"}, 312 {Opt_map_o, "map=off"}, 313 {Opt_map_o, "map=o"}, 314 {Opt_session, "session=%u"}, 315 {Opt_sb, "sbsector=%u"}, 316 {Opt_check_r, "check=relaxed"}, 317 {Opt_check_r, "check=r"}, 318 {Opt_check_s, "check=strict"}, 319 {Opt_check_s, "check=s"}, 320 {Opt_uid, "uid=%u"}, 321 {Opt_gid, "gid=%u"}, 322 {Opt_mode, "mode=%u"}, 323 {Opt_dmode, "dmode=%u"}, 324 {Opt_overriderockperm, "overriderockperm"}, 325 {Opt_block, "block=%u"}, 326 {Opt_ignore, "conv=binary"}, 327 {Opt_ignore, "conv=b"}, 328 {Opt_ignore, "conv=text"}, 329 {Opt_ignore, "conv=t"}, 330 {Opt_ignore, "conv=mtext"}, 331 {Opt_ignore, "conv=m"}, 332 {Opt_ignore, "conv=auto"}, 333 {Opt_ignore, "conv=a"}, 334 {Opt_nocompress, "nocompress"}, 335 {Opt_err, NULL} 336 }; 337 338 static int parse_options(char *options, struct iso9660_options *popt) 339 { 340 char *p; 341 int option; 342 343 popt->map = 'n'; 344 popt->rock = 1; 345 popt->joliet = 1; 346 popt->cruft = 0; 347 popt->hide = 0; 348 popt->showassoc = 0; 349 popt->check = 'u'; /* unset */ 350 popt->nocompress = 0; 351 popt->blocksize = 1024; 352 popt->fmode = popt->dmode = ISOFS_INVALID_MODE; 353 popt->uid_set = 0; 354 popt->gid_set = 0; 355 popt->gid = GLOBAL_ROOT_GID; 356 popt->uid = GLOBAL_ROOT_UID; 357 popt->iocharset = NULL; 358 popt->utf8 = 0; 359 popt->overriderockperm = 0; 360 popt->session=-1; 361 popt->sbsector=-1; 362 if (!options) 363 return 1; 364 365 while ((p = strsep(&options, ",")) != NULL) { 366 int token; 367 substring_t args[MAX_OPT_ARGS]; 368 unsigned n; 369 370 if (!*p) 371 continue; 372 373 token = match_token(p, tokens, args); 374 switch (token) { 375 case Opt_norock: 376 popt->rock = 0; 377 break; 378 case Opt_nojoliet: 379 popt->joliet = 0; 380 break; 381 case Opt_hide: 382 popt->hide = 1; 383 break; 384 case Opt_unhide: 385 case Opt_showassoc: 386 popt->showassoc = 1; 387 break; 388 case Opt_cruft: 389 popt->cruft = 1; 390 break; 391 case Opt_utf8: 392 popt->utf8 = 1; 393 break; 394 #ifdef CONFIG_JOLIET 395 case Opt_iocharset: 396 kfree(popt->iocharset); 397 popt->iocharset = match_strdup(&args[0]); 398 if (!popt->iocharset) 399 return 0; 400 break; 401 #endif 402 case Opt_map_a: 403 popt->map = 'a'; 404 break; 405 case Opt_map_o: 406 popt->map = 'o'; 407 break; 408 case Opt_map_n: 409 popt->map = 'n'; 410 break; 411 case Opt_session: 412 if (match_int(&args[0], &option)) 413 return 0; 414 n = option; 415 /* 416 * Track numbers are supposed to be in range 1-99, the 417 * mount option starts indexing at 0. 418 */ 419 if (n >= 99) 420 return 0; 421 popt->session = n + 1; 422 break; 423 case Opt_sb: 424 if (match_int(&args[0], &option)) 425 return 0; 426 popt->sbsector = option; 427 break; 428 case Opt_check_r: 429 popt->check = 'r'; 430 break; 431 case Opt_check_s: 432 popt->check = 's'; 433 break; 434 case Opt_ignore: 435 break; 436 case Opt_uid: 437 if (match_int(&args[0], &option)) 438 return 0; 439 popt->uid = make_kuid(current_user_ns(), option); 440 if (!uid_valid(popt->uid)) 441 return 0; 442 popt->uid_set = 1; 443 break; 444 case Opt_gid: 445 if (match_int(&args[0], &option)) 446 return 0; 447 popt->gid = make_kgid(current_user_ns(), option); 448 if (!gid_valid(popt->gid)) 449 return 0; 450 popt->gid_set = 1; 451 break; 452 case Opt_mode: 453 if (match_int(&args[0], &option)) 454 return 0; 455 popt->fmode = option; 456 break; 457 case Opt_dmode: 458 if (match_int(&args[0], &option)) 459 return 0; 460 popt->dmode = option; 461 break; 462 case Opt_overriderockperm: 463 popt->overriderockperm = 1; 464 break; 465 case Opt_block: 466 if (match_int(&args[0], &option)) 467 return 0; 468 n = option; 469 if (n != 512 && n != 1024 && n != 2048) 470 return 0; 471 popt->blocksize = n; 472 break; 473 case Opt_nocompress: 474 popt->nocompress = 1; 475 break; 476 default: 477 return 0; 478 } 479 } 480 return 1; 481 } 482 483 /* 484 * Display the mount options in /proc/mounts. 485 */ 486 static int isofs_show_options(struct seq_file *m, struct dentry *root) 487 { 488 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 489 490 if (!sbi->s_rock) seq_puts(m, ",norock"); 491 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 492 if (sbi->s_cruft) seq_puts(m, ",cruft"); 493 if (sbi->s_hide) seq_puts(m, ",hide"); 494 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 495 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 496 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 497 if (sbi->s_utf8) seq_puts(m, ",utf8"); 498 499 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 500 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 501 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 502 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 503 504 if (root->d_sb->s_blocksize != 1024) 505 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 506 507 if (sbi->s_uid_set) 508 seq_printf(m, ",uid=%u", 509 from_kuid_munged(&init_user_ns, sbi->s_uid)); 510 if (sbi->s_gid_set) 511 seq_printf(m, ",gid=%u", 512 from_kgid_munged(&init_user_ns, sbi->s_gid)); 513 514 if (sbi->s_dmode != ISOFS_INVALID_MODE) 515 seq_printf(m, ",dmode=%o", sbi->s_dmode); 516 if (sbi->s_fmode != ISOFS_INVALID_MODE) 517 seq_printf(m, ",fmode=%o", sbi->s_fmode); 518 519 #ifdef CONFIG_JOLIET 520 if (sbi->s_nls_iocharset && 521 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) 522 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 523 #endif 524 return 0; 525 } 526 527 /* 528 * look if the driver can tell the multi session redirection value 529 * 530 * don't change this if you don't know what you do, please! 531 * Multisession is legal only with XA disks. 532 * A non-XA disk with more than one volume descriptor may do it right, but 533 * usually is written in a nowhere standardized "multi-partition" manner. 534 * Multisession uses absolute addressing (solely the first frame of the whole 535 * track is #0), multi-partition uses relative addressing (each first frame of 536 * each track is #0), and a track is not a session. 537 * 538 * A broken CDwriter software or drive firmware does not set new standards, 539 * at least not if conflicting with the existing ones. 540 * 541 * emoenke@gwdg.de 542 */ 543 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 544 545 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 546 { 547 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); 548 unsigned int vol_desc_start = 0; 549 550 if (session > 0) { 551 struct cdrom_tocentry te; 552 553 if (!cdi) 554 return 0; 555 556 te.cdte_track = session; 557 te.cdte_format = CDROM_LBA; 558 if (cdrom_read_tocentry(cdi, &te) == 0) { 559 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 560 session, te.cdte_addr.lba, 561 te.cdte_ctrl & CDROM_DATA_TRACK); 562 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4) 563 return te.cdte_addr.lba; 564 } 565 566 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 567 } 568 569 if (cdi) { 570 struct cdrom_multisession ms_info; 571 572 ms_info.addr_format = CDROM_LBA; 573 if (cdrom_multisession(cdi, &ms_info) == 0) { 574 #if WE_OBEY_THE_WRITTEN_STANDARDS 575 /* necessary for a valid ms_info.addr */ 576 if (ms_info.xa_flag) 577 #endif 578 vol_desc_start = ms_info.addr.lba; 579 } 580 } 581 582 return vol_desc_start; 583 } 584 585 /* 586 * Check if root directory is empty (has less than 3 files). 587 * 588 * Used to detect broken CDs where ISO root directory is empty but Joliet root 589 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 590 * (and Joliet used instead) or else no files would be visible. 591 */ 592 static bool rootdir_empty(struct super_block *sb, unsigned long block) 593 { 594 int offset = 0, files = 0, de_len; 595 struct iso_directory_record *de; 596 struct buffer_head *bh; 597 598 bh = sb_bread(sb, block); 599 if (!bh) 600 return true; 601 while (files < 3) { 602 de = (struct iso_directory_record *) (bh->b_data + offset); 603 de_len = *(unsigned char *) de; 604 if (de_len == 0) 605 break; 606 files++; 607 offset += de_len; 608 } 609 brelse(bh); 610 return files < 3; 611 } 612 613 /* 614 * Initialize the superblock and read the root inode. 615 * 616 * Note: a check_disk_change() has been done immediately prior 617 * to this call, so we don't need to check again. 618 */ 619 static int isofs_fill_super(struct super_block *s, void *data, int silent) 620 { 621 struct buffer_head *bh = NULL, *pri_bh = NULL; 622 struct hs_primary_descriptor *h_pri = NULL; 623 struct iso_primary_descriptor *pri = NULL; 624 struct iso_supplementary_descriptor *sec = NULL; 625 struct iso_directory_record *rootp; 626 struct inode *inode; 627 struct iso9660_options opt; 628 struct isofs_sb_info *sbi; 629 unsigned long first_data_zone; 630 int joliet_level = 0; 631 int iso_blknum, block; 632 int orig_zonesize; 633 int table, error = -EINVAL; 634 unsigned int vol_desc_start; 635 636 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 637 if (!sbi) 638 return -ENOMEM; 639 s->s_fs_info = sbi; 640 641 if (!parse_options((char *)data, &opt)) 642 goto out_freesbi; 643 644 /* 645 * First of all, get the hardware blocksize for this device. 646 * If we don't know what it is, or the hardware blocksize is 647 * larger than the blocksize the user specified, then use 648 * that value. 649 */ 650 /* 651 * What if bugger tells us to go beyond page size? 652 */ 653 if (bdev_logical_block_size(s->s_bdev) > 2048) { 654 printk(KERN_WARNING 655 "ISOFS: unsupported/invalid hardware sector size %d\n", 656 bdev_logical_block_size(s->s_bdev)); 657 goto out_freesbi; 658 } 659 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 660 661 sbi->s_high_sierra = 0; /* default is iso9660 */ 662 sbi->s_session = opt.session; 663 sbi->s_sbsector = opt.sbsector; 664 665 vol_desc_start = (opt.sbsector != -1) ? 666 opt.sbsector : isofs_get_last_session(s,opt.session); 667 668 for (iso_blknum = vol_desc_start+16; 669 iso_blknum < vol_desc_start+100; iso_blknum++) { 670 struct hs_volume_descriptor *hdp; 671 struct iso_volume_descriptor *vdp; 672 673 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 674 if (!(bh = sb_bread(s, block))) 675 goto out_no_read; 676 677 vdp = (struct iso_volume_descriptor *)bh->b_data; 678 hdp = (struct hs_volume_descriptor *)bh->b_data; 679 680 /* 681 * Due to the overlapping physical location of the descriptors, 682 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 683 * proper identification in this case, we first check for ISO. 684 */ 685 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 686 if (isonum_711(vdp->type) == ISO_VD_END) 687 break; 688 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 689 if (!pri) { 690 pri = (struct iso_primary_descriptor *)vdp; 691 /* Save the buffer in case we need it ... */ 692 pri_bh = bh; 693 bh = NULL; 694 } 695 } 696 #ifdef CONFIG_JOLIET 697 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 698 sec = (struct iso_supplementary_descriptor *)vdp; 699 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 700 if (opt.joliet) { 701 if (sec->escape[2] == 0x40) 702 joliet_level = 1; 703 else if (sec->escape[2] == 0x43) 704 joliet_level = 2; 705 else if (sec->escape[2] == 0x45) 706 joliet_level = 3; 707 708 printk(KERN_DEBUG "ISO 9660 Extensions: " 709 "Microsoft Joliet Level %d\n", 710 joliet_level); 711 } 712 goto root_found; 713 } else { 714 /* Unknown supplementary volume descriptor */ 715 sec = NULL; 716 } 717 } 718 #endif 719 } else { 720 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 721 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 722 goto out_freebh; 723 724 sbi->s_high_sierra = 1; 725 opt.rock = 0; 726 h_pri = (struct hs_primary_descriptor *)vdp; 727 goto root_found; 728 } 729 } 730 731 /* Just skip any volume descriptors we don't recognize */ 732 733 brelse(bh); 734 bh = NULL; 735 } 736 /* 737 * If we fall through, either no volume descriptor was found, 738 * or else we passed a primary descriptor looking for others. 739 */ 740 if (!pri) 741 goto out_unknown_format; 742 brelse(bh); 743 bh = pri_bh; 744 pri_bh = NULL; 745 746 root_found: 747 /* We don't support read-write mounts */ 748 if (!sb_rdonly(s)) { 749 error = -EACCES; 750 goto out_freebh; 751 } 752 753 if (joliet_level && (!pri || !opt.rock)) { 754 /* This is the case of Joliet with the norock mount flag. 755 * A disc with both Joliet and Rock Ridge is handled later 756 */ 757 pri = (struct iso_primary_descriptor *) sec; 758 } 759 760 if(sbi->s_high_sierra){ 761 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 762 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 763 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 764 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 765 } else { 766 if (!pri) 767 goto out_freebh; 768 rootp = (struct iso_directory_record *) pri->root_directory_record; 769 sbi->s_nzones = isonum_733(pri->volume_space_size); 770 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 771 sbi->s_max_size = isonum_733(pri->volume_space_size); 772 } 773 774 sbi->s_ninodes = 0; /* No way to figure this out easily */ 775 776 orig_zonesize = sbi->s_log_zone_size; 777 /* 778 * If the zone size is smaller than the hardware sector size, 779 * this is a fatal error. This would occur if the disc drive 780 * had sectors that were 2048 bytes, but the filesystem had 781 * blocks that were 512 bytes (which should only very rarely 782 * happen.) 783 */ 784 if (orig_zonesize < opt.blocksize) 785 goto out_bad_size; 786 787 /* RDE: convert log zone size to bit shift */ 788 switch (sbi->s_log_zone_size) { 789 case 512: sbi->s_log_zone_size = 9; break; 790 case 1024: sbi->s_log_zone_size = 10; break; 791 case 2048: sbi->s_log_zone_size = 11; break; 792 793 default: 794 goto out_bad_zone_size; 795 } 796 797 s->s_magic = ISOFS_SUPER_MAGIC; 798 799 /* 800 * With multi-extent files, file size is only limited by the maximum 801 * size of a file system, which is 8 TB. 802 */ 803 s->s_maxbytes = 0x80000000000LL; 804 805 /* ECMA-119 timestamp from 1900/1/1 with tz offset */ 806 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET; 807 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET; 808 809 /* Set this for reference. Its not currently used except on write 810 which we don't have .. */ 811 812 first_data_zone = isonum_733(rootp->extent) + 813 isonum_711(rootp->ext_attr_length); 814 sbi->s_firstdatazone = first_data_zone; 815 #ifndef BEQUIET 816 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 817 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 818 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 819 if(sbi->s_high_sierra) 820 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 821 #endif 822 823 /* 824 * If the Joliet level is set, we _may_ decide to use the 825 * secondary descriptor, but can't be sure until after we 826 * read the root inode. But before reading the root inode 827 * we may need to change the device blocksize, and would 828 * rather release the old buffer first. So, we cache the 829 * first_data_zone value from the secondary descriptor. 830 */ 831 if (joliet_level) { 832 pri = (struct iso_primary_descriptor *) sec; 833 rootp = (struct iso_directory_record *) 834 pri->root_directory_record; 835 first_data_zone = isonum_733(rootp->extent) + 836 isonum_711(rootp->ext_attr_length); 837 } 838 839 /* 840 * We're all done using the volume descriptor, and may need 841 * to change the device blocksize, so release the buffer now. 842 */ 843 brelse(pri_bh); 844 brelse(bh); 845 846 /* 847 * Force the blocksize to 512 for 512 byte sectors. The file 848 * read primitives really get it wrong in a bad way if we don't 849 * do this. 850 * 851 * Note - we should never be setting the blocksize to something 852 * less than the hardware sector size for the device. If we 853 * do, we would end up having to read larger buffers and split 854 * out portions to satisfy requests. 855 * 856 * Note2- the idea here is that we want to deal with the optimal 857 * zonesize in the filesystem. If we have it set to something less, 858 * then we have horrible problems with trying to piece together 859 * bits of adjacent blocks in order to properly read directory 860 * entries. By forcing the blocksize in this way, we ensure 861 * that we will never be required to do this. 862 */ 863 sb_set_blocksize(s, orig_zonesize); 864 865 sbi->s_nls_iocharset = NULL; 866 867 #ifdef CONFIG_JOLIET 868 if (joliet_level && opt.utf8 == 0) { 869 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 870 sbi->s_nls_iocharset = load_nls(p); 871 if (! sbi->s_nls_iocharset) { 872 /* Fail only if explicit charset specified */ 873 if (opt.iocharset) 874 goto out_freesbi; 875 sbi->s_nls_iocharset = load_nls_default(); 876 } 877 } 878 #endif 879 s->s_op = &isofs_sops; 880 s->s_export_op = &isofs_export_ops; 881 sbi->s_mapping = opt.map; 882 sbi->s_rock = (opt.rock ? 2 : 0); 883 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 884 sbi->s_cruft = opt.cruft; 885 sbi->s_hide = opt.hide; 886 sbi->s_showassoc = opt.showassoc; 887 sbi->s_uid = opt.uid; 888 sbi->s_gid = opt.gid; 889 sbi->s_uid_set = opt.uid_set; 890 sbi->s_gid_set = opt.gid_set; 891 sbi->s_utf8 = opt.utf8; 892 sbi->s_nocompress = opt.nocompress; 893 sbi->s_overriderockperm = opt.overriderockperm; 894 /* 895 * It would be incredibly stupid to allow people to mark every file 896 * on the disk as suid, so we merely allow them to set the default 897 * permissions. 898 */ 899 if (opt.fmode != ISOFS_INVALID_MODE) 900 sbi->s_fmode = opt.fmode & 0777; 901 else 902 sbi->s_fmode = ISOFS_INVALID_MODE; 903 if (opt.dmode != ISOFS_INVALID_MODE) 904 sbi->s_dmode = opt.dmode & 0777; 905 else 906 sbi->s_dmode = ISOFS_INVALID_MODE; 907 908 /* 909 * Read the root inode, which _may_ result in changing 910 * the s_rock flag. Once we have the final s_rock value, 911 * we then decide whether to use the Joliet descriptor. 912 */ 913 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 914 if (IS_ERR(inode)) 915 goto out_no_root; 916 917 /* 918 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 919 * correct Joliet root directory. 920 */ 921 if (sbi->s_rock == 1 && joliet_level && 922 rootdir_empty(s, sbi->s_firstdatazone)) { 923 printk(KERN_NOTICE 924 "ISOFS: primary root directory is empty. " 925 "Disabling Rock Ridge and switching to Joliet."); 926 sbi->s_rock = 0; 927 } 928 929 /* 930 * If this disk has both Rock Ridge and Joliet on it, then we 931 * want to use Rock Ridge by default. This can be overridden 932 * by using the norock mount option. There is still one other 933 * possibility that is not taken into account: a Rock Ridge 934 * CD with Unicode names. Until someone sees such a beast, it 935 * will not be supported. 936 */ 937 if (sbi->s_rock == 1) { 938 joliet_level = 0; 939 } else if (joliet_level) { 940 sbi->s_rock = 0; 941 if (sbi->s_firstdatazone != first_data_zone) { 942 sbi->s_firstdatazone = first_data_zone; 943 printk(KERN_DEBUG 944 "ISOFS: changing to secondary root\n"); 945 iput(inode); 946 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 947 if (IS_ERR(inode)) 948 goto out_no_root; 949 } 950 } 951 952 if (opt.check == 'u') { 953 /* Only Joliet is case insensitive by default */ 954 if (joliet_level) 955 opt.check = 'r'; 956 else 957 opt.check = 's'; 958 } 959 sbi->s_joliet_level = joliet_level; 960 961 /* Make sure the root inode is a directory */ 962 if (!S_ISDIR(inode->i_mode)) { 963 printk(KERN_WARNING 964 "isofs_fill_super: root inode is not a directory. " 965 "Corrupted media?\n"); 966 goto out_iput; 967 } 968 969 table = 0; 970 if (joliet_level) 971 table += 2; 972 if (opt.check == 'r') 973 table++; 974 sbi->s_check = opt.check; 975 976 if (table) 977 s->s_d_op = &isofs_dentry_ops[table - 1]; 978 979 /* get the root dentry */ 980 s->s_root = d_make_root(inode); 981 if (!(s->s_root)) { 982 error = -ENOMEM; 983 goto out_no_inode; 984 } 985 986 kfree(opt.iocharset); 987 988 return 0; 989 990 /* 991 * Display error messages and free resources. 992 */ 993 out_iput: 994 iput(inode); 995 goto out_no_inode; 996 out_no_root: 997 error = PTR_ERR(inode); 998 if (error != -ENOMEM) 999 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 1000 out_no_inode: 1001 #ifdef CONFIG_JOLIET 1002 unload_nls(sbi->s_nls_iocharset); 1003 #endif 1004 goto out_freesbi; 1005 out_no_read: 1006 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 1007 __func__, s->s_id, iso_blknum, block); 1008 goto out_freebh; 1009 out_bad_zone_size: 1010 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 1011 sbi->s_log_zone_size); 1012 goto out_freebh; 1013 out_bad_size: 1014 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 1015 orig_zonesize, opt.blocksize); 1016 goto out_freebh; 1017 out_unknown_format: 1018 if (!silent) 1019 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1020 1021 out_freebh: 1022 brelse(bh); 1023 brelse(pri_bh); 1024 out_freesbi: 1025 kfree(opt.iocharset); 1026 kfree(sbi); 1027 s->s_fs_info = NULL; 1028 return error; 1029 } 1030 1031 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1032 { 1033 struct super_block *sb = dentry->d_sb; 1034 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1035 1036 buf->f_type = ISOFS_SUPER_MAGIC; 1037 buf->f_bsize = sb->s_blocksize; 1038 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1039 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1040 buf->f_bfree = 0; 1041 buf->f_bavail = 0; 1042 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1043 buf->f_ffree = 0; 1044 buf->f_fsid.val[0] = (u32)id; 1045 buf->f_fsid.val[1] = (u32)(id >> 32); 1046 buf->f_namelen = NAME_MAX; 1047 return 0; 1048 } 1049 1050 /* 1051 * Get a set of blocks; filling in buffer_heads if already allocated 1052 * or getblk() if they are not. Returns the number of blocks inserted 1053 * (-ve == error.) 1054 */ 1055 int isofs_get_blocks(struct inode *inode, sector_t iblock, 1056 struct buffer_head **bh, unsigned long nblocks) 1057 { 1058 unsigned long b_off = iblock; 1059 unsigned offset, sect_size; 1060 unsigned int firstext; 1061 unsigned long nextblk, nextoff; 1062 int section, rv, error; 1063 struct iso_inode_info *ei = ISOFS_I(inode); 1064 1065 error = -EIO; 1066 rv = 0; 1067 if (iblock != b_off) { 1068 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1069 goto abort; 1070 } 1071 1072 1073 offset = 0; 1074 firstext = ei->i_first_extent; 1075 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1076 nextblk = ei->i_next_section_block; 1077 nextoff = ei->i_next_section_offset; 1078 section = 0; 1079 1080 while (nblocks) { 1081 /* If we are *way* beyond the end of the file, print a message. 1082 * Access beyond the end of the file up to the next page boundary 1083 * is normal, however because of the way the page cache works. 1084 * In this case, we just return 0 so that we can properly fill 1085 * the page with useless information without generating any 1086 * I/O errors. 1087 */ 1088 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1089 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1090 __func__, b_off, 1091 (unsigned long long)inode->i_size); 1092 goto abort; 1093 } 1094 1095 /* On the last section, nextblk == 0, section size is likely to 1096 * exceed sect_size by a partial block, and access beyond the 1097 * end of the file will reach beyond the section size, too. 1098 */ 1099 while (nextblk && (b_off >= (offset + sect_size))) { 1100 struct inode *ninode; 1101 1102 offset += sect_size; 1103 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1104 if (IS_ERR(ninode)) { 1105 error = PTR_ERR(ninode); 1106 goto abort; 1107 } 1108 firstext = ISOFS_I(ninode)->i_first_extent; 1109 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1110 nextblk = ISOFS_I(ninode)->i_next_section_block; 1111 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1112 iput(ninode); 1113 1114 if (++section > 100) { 1115 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1116 " aborting...\n", __func__); 1117 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1118 "nextblk=%lu nextoff=%lu\n", __func__, 1119 b_off, firstext, (unsigned) sect_size, 1120 nextblk, nextoff); 1121 goto abort; 1122 } 1123 } 1124 1125 if (*bh) { 1126 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1127 } else { 1128 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1129 if (!*bh) 1130 goto abort; 1131 } 1132 bh++; /* Next buffer head */ 1133 b_off++; /* Next buffer offset */ 1134 nblocks--; 1135 rv++; 1136 } 1137 1138 error = 0; 1139 abort: 1140 return rv != 0 ? rv : error; 1141 } 1142 1143 /* 1144 * Used by the standard interfaces. 1145 */ 1146 static int isofs_get_block(struct inode *inode, sector_t iblock, 1147 struct buffer_head *bh_result, int create) 1148 { 1149 int ret; 1150 1151 if (create) { 1152 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1153 return -EROFS; 1154 } 1155 1156 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1157 return ret < 0 ? ret : 0; 1158 } 1159 1160 static int isofs_bmap(struct inode *inode, sector_t block) 1161 { 1162 struct buffer_head dummy; 1163 int error; 1164 1165 dummy.b_state = 0; 1166 dummy.b_blocknr = -1000; 1167 error = isofs_get_block(inode, block, &dummy, 0); 1168 if (!error) 1169 return dummy.b_blocknr; 1170 return 0; 1171 } 1172 1173 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1174 { 1175 sector_t blknr = isofs_bmap(inode, block); 1176 if (!blknr) 1177 return NULL; 1178 return sb_bread(inode->i_sb, blknr); 1179 } 1180 1181 static int isofs_readpage(struct file *file, struct page *page) 1182 { 1183 return mpage_readpage(page, isofs_get_block); 1184 } 1185 1186 static void isofs_readahead(struct readahead_control *rac) 1187 { 1188 mpage_readahead(rac, isofs_get_block); 1189 } 1190 1191 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1192 { 1193 return generic_block_bmap(mapping,block,isofs_get_block); 1194 } 1195 1196 static const struct address_space_operations isofs_aops = { 1197 .readpage = isofs_readpage, 1198 .readahead = isofs_readahead, 1199 .bmap = _isofs_bmap 1200 }; 1201 1202 static int isofs_read_level3_size(struct inode *inode) 1203 { 1204 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1205 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1206 struct buffer_head *bh = NULL; 1207 unsigned long block, offset, block_saved, offset_saved; 1208 int i = 0; 1209 int more_entries = 0; 1210 struct iso_directory_record *tmpde = NULL; 1211 struct iso_inode_info *ei = ISOFS_I(inode); 1212 1213 inode->i_size = 0; 1214 1215 /* The first 16 blocks are reserved as the System Area. Thus, 1216 * no inodes can appear in block 0. We use this to flag that 1217 * this is the last section. */ 1218 ei->i_next_section_block = 0; 1219 ei->i_next_section_offset = 0; 1220 1221 block = ei->i_iget5_block; 1222 offset = ei->i_iget5_offset; 1223 1224 do { 1225 struct iso_directory_record *de; 1226 unsigned int de_len; 1227 1228 if (!bh) { 1229 bh = sb_bread(inode->i_sb, block); 1230 if (!bh) 1231 goto out_noread; 1232 } 1233 de = (struct iso_directory_record *) (bh->b_data + offset); 1234 de_len = *(unsigned char *) de; 1235 1236 if (de_len == 0) { 1237 brelse(bh); 1238 bh = NULL; 1239 ++block; 1240 offset = 0; 1241 continue; 1242 } 1243 1244 block_saved = block; 1245 offset_saved = offset; 1246 offset += de_len; 1247 1248 /* Make sure we have a full directory entry */ 1249 if (offset >= bufsize) { 1250 int slop = bufsize - offset + de_len; 1251 if (!tmpde) { 1252 tmpde = kmalloc(256, GFP_KERNEL); 1253 if (!tmpde) 1254 goto out_nomem; 1255 } 1256 memcpy(tmpde, de, slop); 1257 offset &= bufsize - 1; 1258 block++; 1259 brelse(bh); 1260 bh = NULL; 1261 if (offset) { 1262 bh = sb_bread(inode->i_sb, block); 1263 if (!bh) 1264 goto out_noread; 1265 memcpy((void *)tmpde+slop, bh->b_data, offset); 1266 } 1267 de = tmpde; 1268 } 1269 1270 inode->i_size += isonum_733(de->size); 1271 if (i == 1) { 1272 ei->i_next_section_block = block_saved; 1273 ei->i_next_section_offset = offset_saved; 1274 } 1275 1276 more_entries = de->flags[-high_sierra] & 0x80; 1277 1278 i++; 1279 if (i > 100) 1280 goto out_toomany; 1281 } while (more_entries); 1282 out: 1283 kfree(tmpde); 1284 if (bh) 1285 brelse(bh); 1286 return 0; 1287 1288 out_nomem: 1289 if (bh) 1290 brelse(bh); 1291 return -ENOMEM; 1292 1293 out_noread: 1294 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1295 kfree(tmpde); 1296 return -EIO; 1297 1298 out_toomany: 1299 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1300 "isofs_read_level3_size: inode=%lu\n", 1301 __func__, inode->i_ino); 1302 goto out; 1303 } 1304 1305 static int isofs_read_inode(struct inode *inode, int relocated) 1306 { 1307 struct super_block *sb = inode->i_sb; 1308 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1309 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1310 unsigned long block; 1311 int high_sierra = sbi->s_high_sierra; 1312 struct buffer_head *bh; 1313 struct iso_directory_record *de; 1314 struct iso_directory_record *tmpde = NULL; 1315 unsigned int de_len; 1316 unsigned long offset; 1317 struct iso_inode_info *ei = ISOFS_I(inode); 1318 int ret = -EIO; 1319 1320 block = ei->i_iget5_block; 1321 bh = sb_bread(inode->i_sb, block); 1322 if (!bh) 1323 goto out_badread; 1324 1325 offset = ei->i_iget5_offset; 1326 1327 de = (struct iso_directory_record *) (bh->b_data + offset); 1328 de_len = *(unsigned char *) de; 1329 1330 if (offset + de_len > bufsize) { 1331 int frag1 = bufsize - offset; 1332 1333 tmpde = kmalloc(de_len, GFP_KERNEL); 1334 if (!tmpde) { 1335 ret = -ENOMEM; 1336 goto fail; 1337 } 1338 memcpy(tmpde, bh->b_data + offset, frag1); 1339 brelse(bh); 1340 bh = sb_bread(inode->i_sb, ++block); 1341 if (!bh) 1342 goto out_badread; 1343 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1344 de = tmpde; 1345 } 1346 1347 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1348 ei->i_iget5_offset, 1349 ISOFS_BUFFER_BITS(inode)); 1350 1351 /* Assume it is a normal-format file unless told otherwise */ 1352 ei->i_file_format = isofs_file_normal; 1353 1354 if (de->flags[-high_sierra] & 2) { 1355 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1356 inode->i_mode = S_IFDIR | sbi->s_dmode; 1357 else 1358 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1359 set_nlink(inode, 1); /* 1360 * Set to 1. We know there are 2, but 1361 * the find utility tries to optimize 1362 * if it is 2, and it screws up. It is 1363 * easier to give 1 which tells find to 1364 * do it the hard way. 1365 */ 1366 } else { 1367 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1368 inode->i_mode = S_IFREG | sbi->s_fmode; 1369 } else { 1370 /* 1371 * Set default permissions: r-x for all. The disc 1372 * could be shared with DOS machines so virtually 1373 * anything could be a valid executable. 1374 */ 1375 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1376 } 1377 set_nlink(inode, 1); 1378 } 1379 inode->i_uid = sbi->s_uid; 1380 inode->i_gid = sbi->s_gid; 1381 inode->i_blocks = 0; 1382 1383 ei->i_format_parm[0] = 0; 1384 ei->i_format_parm[1] = 0; 1385 ei->i_format_parm[2] = 0; 1386 1387 ei->i_section_size = isonum_733(de->size); 1388 if (de->flags[-high_sierra] & 0x80) { 1389 ret = isofs_read_level3_size(inode); 1390 if (ret < 0) 1391 goto fail; 1392 ret = -EIO; 1393 } else { 1394 ei->i_next_section_block = 0; 1395 ei->i_next_section_offset = 0; 1396 inode->i_size = isonum_733(de->size); 1397 } 1398 1399 /* 1400 * Some dipshit decided to store some other bit of information 1401 * in the high byte of the file length. Truncate size in case 1402 * this CDROM was mounted with the cruft option. 1403 */ 1404 1405 if (sbi->s_cruft) 1406 inode->i_size &= 0x00ffffff; 1407 1408 if (de->interleave[0]) { 1409 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1410 inode->i_size = 0; 1411 } 1412 1413 /* I have no idea what file_unit_size is used for, so 1414 we will flag it for now */ 1415 if (de->file_unit_size[0] != 0) { 1416 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1417 inode->i_ino); 1418 } 1419 1420 /* I have no idea what other flag bits are used for, so 1421 we will flag it for now */ 1422 #ifdef DEBUG 1423 if((de->flags[-high_sierra] & ~2)!= 0){ 1424 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1425 "(%ld %x).\n", 1426 inode->i_ino, de->flags[-high_sierra]); 1427 } 1428 #endif 1429 1430 inode->i_mtime.tv_sec = 1431 inode->i_atime.tv_sec = 1432 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1433 inode->i_mtime.tv_nsec = 1434 inode->i_atime.tv_nsec = 1435 inode->i_ctime.tv_nsec = 0; 1436 1437 ei->i_first_extent = (isonum_733(de->extent) + 1438 isonum_711(de->ext_attr_length)); 1439 1440 /* Set the number of blocks for stat() - should be done before RR */ 1441 inode->i_blocks = (inode->i_size + 511) >> 9; 1442 1443 /* 1444 * Now test for possible Rock Ridge extensions which will override 1445 * some of these numbers in the inode structure. 1446 */ 1447 1448 if (!high_sierra) { 1449 parse_rock_ridge_inode(de, inode, relocated); 1450 /* if we want uid/gid set, override the rock ridge setting */ 1451 if (sbi->s_uid_set) 1452 inode->i_uid = sbi->s_uid; 1453 if (sbi->s_gid_set) 1454 inode->i_gid = sbi->s_gid; 1455 } 1456 /* Now set final access rights if overriding rock ridge setting */ 1457 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1458 sbi->s_dmode != ISOFS_INVALID_MODE) 1459 inode->i_mode = S_IFDIR | sbi->s_dmode; 1460 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1461 sbi->s_fmode != ISOFS_INVALID_MODE) 1462 inode->i_mode = S_IFREG | sbi->s_fmode; 1463 1464 /* Install the inode operations vector */ 1465 if (S_ISREG(inode->i_mode)) { 1466 inode->i_fop = &generic_ro_fops; 1467 switch (ei->i_file_format) { 1468 #ifdef CONFIG_ZISOFS 1469 case isofs_file_compressed: 1470 inode->i_data.a_ops = &zisofs_aops; 1471 break; 1472 #endif 1473 default: 1474 inode->i_data.a_ops = &isofs_aops; 1475 break; 1476 } 1477 } else if (S_ISDIR(inode->i_mode)) { 1478 inode->i_op = &isofs_dir_inode_operations; 1479 inode->i_fop = &isofs_dir_operations; 1480 } else if (S_ISLNK(inode->i_mode)) { 1481 inode->i_op = &page_symlink_inode_operations; 1482 inode_nohighmem(inode); 1483 inode->i_data.a_ops = &isofs_symlink_aops; 1484 } else 1485 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1486 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1487 1488 ret = 0; 1489 out: 1490 kfree(tmpde); 1491 if (bh) 1492 brelse(bh); 1493 return ret; 1494 1495 out_badread: 1496 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1497 fail: 1498 goto out; 1499 } 1500 1501 struct isofs_iget5_callback_data { 1502 unsigned long block; 1503 unsigned long offset; 1504 }; 1505 1506 static int isofs_iget5_test(struct inode *ino, void *data) 1507 { 1508 struct iso_inode_info *i = ISOFS_I(ino); 1509 struct isofs_iget5_callback_data *d = 1510 (struct isofs_iget5_callback_data*)data; 1511 return (i->i_iget5_block == d->block) 1512 && (i->i_iget5_offset == d->offset); 1513 } 1514 1515 static int isofs_iget5_set(struct inode *ino, void *data) 1516 { 1517 struct iso_inode_info *i = ISOFS_I(ino); 1518 struct isofs_iget5_callback_data *d = 1519 (struct isofs_iget5_callback_data*)data; 1520 i->i_iget5_block = d->block; 1521 i->i_iget5_offset = d->offset; 1522 return 0; 1523 } 1524 1525 /* Store, in the inode's containing structure, the block and block 1526 * offset that point to the underlying meta-data for the inode. The 1527 * code below is otherwise similar to the iget() code in 1528 * include/linux/fs.h */ 1529 struct inode *__isofs_iget(struct super_block *sb, 1530 unsigned long block, 1531 unsigned long offset, 1532 int relocated) 1533 { 1534 unsigned long hashval; 1535 struct inode *inode; 1536 struct isofs_iget5_callback_data data; 1537 long ret; 1538 1539 if (offset >= 1ul << sb->s_blocksize_bits) 1540 return ERR_PTR(-EINVAL); 1541 1542 data.block = block; 1543 data.offset = offset; 1544 1545 hashval = (block << sb->s_blocksize_bits) | offset; 1546 1547 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1548 &isofs_iget5_set, &data); 1549 1550 if (!inode) 1551 return ERR_PTR(-ENOMEM); 1552 1553 if (inode->i_state & I_NEW) { 1554 ret = isofs_read_inode(inode, relocated); 1555 if (ret < 0) { 1556 iget_failed(inode); 1557 inode = ERR_PTR(ret); 1558 } else { 1559 unlock_new_inode(inode); 1560 } 1561 } 1562 1563 return inode; 1564 } 1565 1566 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1567 int flags, const char *dev_name, void *data) 1568 { 1569 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1570 } 1571 1572 static struct file_system_type iso9660_fs_type = { 1573 .owner = THIS_MODULE, 1574 .name = "iso9660", 1575 .mount = isofs_mount, 1576 .kill_sb = kill_block_super, 1577 .fs_flags = FS_REQUIRES_DEV, 1578 }; 1579 MODULE_ALIAS_FS("iso9660"); 1580 MODULE_ALIAS("iso9660"); 1581 1582 static int __init init_iso9660_fs(void) 1583 { 1584 int err = init_inodecache(); 1585 if (err) 1586 goto out; 1587 #ifdef CONFIG_ZISOFS 1588 err = zisofs_init(); 1589 if (err) 1590 goto out1; 1591 #endif 1592 err = register_filesystem(&iso9660_fs_type); 1593 if (err) 1594 goto out2; 1595 return 0; 1596 out2: 1597 #ifdef CONFIG_ZISOFS 1598 zisofs_cleanup(); 1599 out1: 1600 #endif 1601 destroy_inodecache(); 1602 out: 1603 return err; 1604 } 1605 1606 static void __exit exit_iso9660_fs(void) 1607 { 1608 unregister_filesystem(&iso9660_fs_type); 1609 #ifdef CONFIG_ZISOFS 1610 zisofs_cleanup(); 1611 #endif 1612 destroy_inodecache(); 1613 } 1614 1615 module_init(init_iso9660_fs) 1616 module_exit(exit_iso9660_fs) 1617 MODULE_LICENSE("GPL"); 1618