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 static int isofs_fill_super(struct super_block *s, void *data, int silent) 617 { 618 struct buffer_head *bh = NULL, *pri_bh = NULL; 619 struct hs_primary_descriptor *h_pri = NULL; 620 struct iso_primary_descriptor *pri = NULL; 621 struct iso_supplementary_descriptor *sec = NULL; 622 struct iso_directory_record *rootp; 623 struct inode *inode; 624 struct iso9660_options opt; 625 struct isofs_sb_info *sbi; 626 unsigned long first_data_zone; 627 int joliet_level = 0; 628 int iso_blknum, block; 629 int orig_zonesize; 630 int table, error = -EINVAL; 631 unsigned int vol_desc_start; 632 633 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 634 if (!sbi) 635 return -ENOMEM; 636 s->s_fs_info = sbi; 637 638 if (!parse_options((char *)data, &opt)) 639 goto out_freesbi; 640 641 /* 642 * First of all, get the hardware blocksize for this device. 643 * If we don't know what it is, or the hardware blocksize is 644 * larger than the blocksize the user specified, then use 645 * that value. 646 */ 647 /* 648 * What if bugger tells us to go beyond page size? 649 */ 650 if (bdev_logical_block_size(s->s_bdev) > 2048) { 651 printk(KERN_WARNING 652 "ISOFS: unsupported/invalid hardware sector size %d\n", 653 bdev_logical_block_size(s->s_bdev)); 654 goto out_freesbi; 655 } 656 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 657 658 sbi->s_high_sierra = 0; /* default is iso9660 */ 659 sbi->s_session = opt.session; 660 sbi->s_sbsector = opt.sbsector; 661 662 vol_desc_start = (opt.sbsector != -1) ? 663 opt.sbsector : isofs_get_last_session(s,opt.session); 664 665 for (iso_blknum = vol_desc_start+16; 666 iso_blknum < vol_desc_start+100; iso_blknum++) { 667 struct hs_volume_descriptor *hdp; 668 struct iso_volume_descriptor *vdp; 669 670 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 671 if (!(bh = sb_bread(s, block))) 672 goto out_no_read; 673 674 vdp = (struct iso_volume_descriptor *)bh->b_data; 675 hdp = (struct hs_volume_descriptor *)bh->b_data; 676 677 /* 678 * Due to the overlapping physical location of the descriptors, 679 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 680 * proper identification in this case, we first check for ISO. 681 */ 682 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 683 if (isonum_711(vdp->type) == ISO_VD_END) 684 break; 685 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 686 if (!pri) { 687 pri = (struct iso_primary_descriptor *)vdp; 688 /* Save the buffer in case we need it ... */ 689 pri_bh = bh; 690 bh = NULL; 691 } 692 } 693 #ifdef CONFIG_JOLIET 694 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 695 sec = (struct iso_supplementary_descriptor *)vdp; 696 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 697 if (opt.joliet) { 698 if (sec->escape[2] == 0x40) 699 joliet_level = 1; 700 else if (sec->escape[2] == 0x43) 701 joliet_level = 2; 702 else if (sec->escape[2] == 0x45) 703 joliet_level = 3; 704 705 printk(KERN_DEBUG "ISO 9660 Extensions: " 706 "Microsoft Joliet Level %d\n", 707 joliet_level); 708 } 709 goto root_found; 710 } else { 711 /* Unknown supplementary volume descriptor */ 712 sec = NULL; 713 } 714 } 715 #endif 716 } else { 717 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 718 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 719 goto out_freebh; 720 721 sbi->s_high_sierra = 1; 722 opt.rock = 0; 723 h_pri = (struct hs_primary_descriptor *)vdp; 724 goto root_found; 725 } 726 } 727 728 /* Just skip any volume descriptors we don't recognize */ 729 730 brelse(bh); 731 bh = NULL; 732 } 733 /* 734 * If we fall through, either no volume descriptor was found, 735 * or else we passed a primary descriptor looking for others. 736 */ 737 if (!pri) 738 goto out_unknown_format; 739 brelse(bh); 740 bh = pri_bh; 741 pri_bh = NULL; 742 743 root_found: 744 /* We don't support read-write mounts */ 745 if (!sb_rdonly(s)) { 746 error = -EACCES; 747 goto out_freebh; 748 } 749 750 if (joliet_level && (!pri || !opt.rock)) { 751 /* This is the case of Joliet with the norock mount flag. 752 * A disc with both Joliet and Rock Ridge is handled later 753 */ 754 pri = (struct iso_primary_descriptor *) sec; 755 } 756 757 if(sbi->s_high_sierra){ 758 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 759 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 760 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 761 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 762 } else { 763 if (!pri) 764 goto out_freebh; 765 rootp = (struct iso_directory_record *) pri->root_directory_record; 766 sbi->s_nzones = isonum_733(pri->volume_space_size); 767 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 768 sbi->s_max_size = isonum_733(pri->volume_space_size); 769 } 770 771 sbi->s_ninodes = 0; /* No way to figure this out easily */ 772 773 orig_zonesize = sbi->s_log_zone_size; 774 /* 775 * If the zone size is smaller than the hardware sector size, 776 * this is a fatal error. This would occur if the disc drive 777 * had sectors that were 2048 bytes, but the filesystem had 778 * blocks that were 512 bytes (which should only very rarely 779 * happen.) 780 */ 781 if (orig_zonesize < opt.blocksize) 782 goto out_bad_size; 783 784 /* RDE: convert log zone size to bit shift */ 785 switch (sbi->s_log_zone_size) { 786 case 512: sbi->s_log_zone_size = 9; break; 787 case 1024: sbi->s_log_zone_size = 10; break; 788 case 2048: sbi->s_log_zone_size = 11; break; 789 790 default: 791 goto out_bad_zone_size; 792 } 793 794 s->s_magic = ISOFS_SUPER_MAGIC; 795 796 /* 797 * With multi-extent files, file size is only limited by the maximum 798 * size of a file system, which is 8 TB. 799 */ 800 s->s_maxbytes = 0x80000000000LL; 801 802 /* ECMA-119 timestamp from 1900/1/1 with tz offset */ 803 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET; 804 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET; 805 806 /* Set this for reference. Its not currently used except on write 807 which we don't have .. */ 808 809 first_data_zone = isonum_733(rootp->extent) + 810 isonum_711(rootp->ext_attr_length); 811 sbi->s_firstdatazone = first_data_zone; 812 #ifndef BEQUIET 813 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 814 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 815 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 816 if(sbi->s_high_sierra) 817 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 818 #endif 819 820 /* 821 * If the Joliet level is set, we _may_ decide to use the 822 * secondary descriptor, but can't be sure until after we 823 * read the root inode. But before reading the root inode 824 * we may need to change the device blocksize, and would 825 * rather release the old buffer first. So, we cache the 826 * first_data_zone value from the secondary descriptor. 827 */ 828 if (joliet_level) { 829 pri = (struct iso_primary_descriptor *) sec; 830 rootp = (struct iso_directory_record *) 831 pri->root_directory_record; 832 first_data_zone = isonum_733(rootp->extent) + 833 isonum_711(rootp->ext_attr_length); 834 } 835 836 /* 837 * We're all done using the volume descriptor, and may need 838 * to change the device blocksize, so release the buffer now. 839 */ 840 brelse(pri_bh); 841 brelse(bh); 842 843 /* 844 * Force the blocksize to 512 for 512 byte sectors. The file 845 * read primitives really get it wrong in a bad way if we don't 846 * do this. 847 * 848 * Note - we should never be setting the blocksize to something 849 * less than the hardware sector size for the device. If we 850 * do, we would end up having to read larger buffers and split 851 * out portions to satisfy requests. 852 * 853 * Note2- the idea here is that we want to deal with the optimal 854 * zonesize in the filesystem. If we have it set to something less, 855 * then we have horrible problems with trying to piece together 856 * bits of adjacent blocks in order to properly read directory 857 * entries. By forcing the blocksize in this way, we ensure 858 * that we will never be required to do this. 859 */ 860 sb_set_blocksize(s, orig_zonesize); 861 862 sbi->s_nls_iocharset = NULL; 863 864 #ifdef CONFIG_JOLIET 865 if (joliet_level && opt.utf8 == 0) { 866 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 867 sbi->s_nls_iocharset = load_nls(p); 868 if (! sbi->s_nls_iocharset) { 869 /* Fail only if explicit charset specified */ 870 if (opt.iocharset) 871 goto out_freesbi; 872 sbi->s_nls_iocharset = load_nls_default(); 873 } 874 } 875 #endif 876 s->s_op = &isofs_sops; 877 s->s_export_op = &isofs_export_ops; 878 sbi->s_mapping = opt.map; 879 sbi->s_rock = (opt.rock ? 2 : 0); 880 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 881 sbi->s_cruft = opt.cruft; 882 sbi->s_hide = opt.hide; 883 sbi->s_showassoc = opt.showassoc; 884 sbi->s_uid = opt.uid; 885 sbi->s_gid = opt.gid; 886 sbi->s_uid_set = opt.uid_set; 887 sbi->s_gid_set = opt.gid_set; 888 sbi->s_utf8 = opt.utf8; 889 sbi->s_nocompress = opt.nocompress; 890 sbi->s_overriderockperm = opt.overriderockperm; 891 /* 892 * It would be incredibly stupid to allow people to mark every file 893 * on the disk as suid, so we merely allow them to set the default 894 * permissions. 895 */ 896 if (opt.fmode != ISOFS_INVALID_MODE) 897 sbi->s_fmode = opt.fmode & 0777; 898 else 899 sbi->s_fmode = ISOFS_INVALID_MODE; 900 if (opt.dmode != ISOFS_INVALID_MODE) 901 sbi->s_dmode = opt.dmode & 0777; 902 else 903 sbi->s_dmode = ISOFS_INVALID_MODE; 904 905 /* 906 * Read the root inode, which _may_ result in changing 907 * the s_rock flag. Once we have the final s_rock value, 908 * we then decide whether to use the Joliet descriptor. 909 */ 910 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 911 if (IS_ERR(inode)) 912 goto out_no_root; 913 914 /* 915 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 916 * correct Joliet root directory. 917 */ 918 if (sbi->s_rock == 1 && joliet_level && 919 rootdir_empty(s, sbi->s_firstdatazone)) { 920 printk(KERN_NOTICE 921 "ISOFS: primary root directory is empty. " 922 "Disabling Rock Ridge and switching to Joliet."); 923 sbi->s_rock = 0; 924 } 925 926 /* 927 * If this disk has both Rock Ridge and Joliet on it, then we 928 * want to use Rock Ridge by default. This can be overridden 929 * by using the norock mount option. There is still one other 930 * possibility that is not taken into account: a Rock Ridge 931 * CD with Unicode names. Until someone sees such a beast, it 932 * will not be supported. 933 */ 934 if (sbi->s_rock == 1) { 935 joliet_level = 0; 936 } else if (joliet_level) { 937 sbi->s_rock = 0; 938 if (sbi->s_firstdatazone != first_data_zone) { 939 sbi->s_firstdatazone = first_data_zone; 940 printk(KERN_DEBUG 941 "ISOFS: changing to secondary root\n"); 942 iput(inode); 943 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 944 if (IS_ERR(inode)) 945 goto out_no_root; 946 } 947 } 948 949 if (opt.check == 'u') { 950 /* Only Joliet is case insensitive by default */ 951 if (joliet_level) 952 opt.check = 'r'; 953 else 954 opt.check = 's'; 955 } 956 sbi->s_joliet_level = joliet_level; 957 958 /* Make sure the root inode is a directory */ 959 if (!S_ISDIR(inode->i_mode)) { 960 printk(KERN_WARNING 961 "isofs_fill_super: root inode is not a directory. " 962 "Corrupted media?\n"); 963 goto out_iput; 964 } 965 966 table = 0; 967 if (joliet_level) 968 table += 2; 969 if (opt.check == 'r') 970 table++; 971 sbi->s_check = opt.check; 972 973 if (table) 974 s->s_d_op = &isofs_dentry_ops[table - 1]; 975 976 /* get the root dentry */ 977 s->s_root = d_make_root(inode); 978 if (!(s->s_root)) { 979 error = -ENOMEM; 980 goto out_no_inode; 981 } 982 983 kfree(opt.iocharset); 984 985 return 0; 986 987 /* 988 * Display error messages and free resources. 989 */ 990 out_iput: 991 iput(inode); 992 goto out_no_inode; 993 out_no_root: 994 error = PTR_ERR(inode); 995 if (error != -ENOMEM) 996 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 997 out_no_inode: 998 #ifdef CONFIG_JOLIET 999 unload_nls(sbi->s_nls_iocharset); 1000 #endif 1001 goto out_freesbi; 1002 out_no_read: 1003 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 1004 __func__, s->s_id, iso_blknum, block); 1005 goto out_freebh; 1006 out_bad_zone_size: 1007 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 1008 sbi->s_log_zone_size); 1009 goto out_freebh; 1010 out_bad_size: 1011 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 1012 orig_zonesize, opt.blocksize); 1013 goto out_freebh; 1014 out_unknown_format: 1015 if (!silent) 1016 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1017 1018 out_freebh: 1019 brelse(bh); 1020 brelse(pri_bh); 1021 out_freesbi: 1022 kfree(opt.iocharset); 1023 kfree(sbi); 1024 s->s_fs_info = NULL; 1025 return error; 1026 } 1027 1028 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1029 { 1030 struct super_block *sb = dentry->d_sb; 1031 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1032 1033 buf->f_type = ISOFS_SUPER_MAGIC; 1034 buf->f_bsize = sb->s_blocksize; 1035 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1036 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1037 buf->f_bfree = 0; 1038 buf->f_bavail = 0; 1039 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1040 buf->f_ffree = 0; 1041 buf->f_fsid.val[0] = (u32)id; 1042 buf->f_fsid.val[1] = (u32)(id >> 32); 1043 buf->f_namelen = NAME_MAX; 1044 return 0; 1045 } 1046 1047 /* 1048 * Get a set of blocks; filling in buffer_heads if already allocated 1049 * or getblk() if they are not. Returns the number of blocks inserted 1050 * (-ve == error.) 1051 */ 1052 int isofs_get_blocks(struct inode *inode, sector_t iblock, 1053 struct buffer_head **bh, unsigned long nblocks) 1054 { 1055 unsigned long b_off = iblock; 1056 unsigned offset, sect_size; 1057 unsigned int firstext; 1058 unsigned long nextblk, nextoff; 1059 int section, rv, error; 1060 struct iso_inode_info *ei = ISOFS_I(inode); 1061 1062 error = -EIO; 1063 rv = 0; 1064 if (iblock != b_off) { 1065 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1066 goto abort; 1067 } 1068 1069 1070 offset = 0; 1071 firstext = ei->i_first_extent; 1072 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1073 nextblk = ei->i_next_section_block; 1074 nextoff = ei->i_next_section_offset; 1075 section = 0; 1076 1077 while (nblocks) { 1078 /* If we are *way* beyond the end of the file, print a message. 1079 * Access beyond the end of the file up to the next page boundary 1080 * is normal, however because of the way the page cache works. 1081 * In this case, we just return 0 so that we can properly fill 1082 * the page with useless information without generating any 1083 * I/O errors. 1084 */ 1085 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1086 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1087 __func__, b_off, 1088 (unsigned long long)inode->i_size); 1089 goto abort; 1090 } 1091 1092 /* On the last section, nextblk == 0, section size is likely to 1093 * exceed sect_size by a partial block, and access beyond the 1094 * end of the file will reach beyond the section size, too. 1095 */ 1096 while (nextblk && (b_off >= (offset + sect_size))) { 1097 struct inode *ninode; 1098 1099 offset += sect_size; 1100 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1101 if (IS_ERR(ninode)) { 1102 error = PTR_ERR(ninode); 1103 goto abort; 1104 } 1105 firstext = ISOFS_I(ninode)->i_first_extent; 1106 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1107 nextblk = ISOFS_I(ninode)->i_next_section_block; 1108 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1109 iput(ninode); 1110 1111 if (++section > 100) { 1112 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1113 " aborting...\n", __func__); 1114 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1115 "nextblk=%lu nextoff=%lu\n", __func__, 1116 b_off, firstext, (unsigned) sect_size, 1117 nextblk, nextoff); 1118 goto abort; 1119 } 1120 } 1121 1122 if (*bh) { 1123 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1124 } else { 1125 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1126 if (!*bh) 1127 goto abort; 1128 } 1129 bh++; /* Next buffer head */ 1130 b_off++; /* Next buffer offset */ 1131 nblocks--; 1132 rv++; 1133 } 1134 1135 error = 0; 1136 abort: 1137 return rv != 0 ? rv : error; 1138 } 1139 1140 /* 1141 * Used by the standard interfaces. 1142 */ 1143 static int isofs_get_block(struct inode *inode, sector_t iblock, 1144 struct buffer_head *bh_result, int create) 1145 { 1146 int ret; 1147 1148 if (create) { 1149 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1150 return -EROFS; 1151 } 1152 1153 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1154 return ret < 0 ? ret : 0; 1155 } 1156 1157 static int isofs_bmap(struct inode *inode, sector_t block) 1158 { 1159 struct buffer_head dummy; 1160 int error; 1161 1162 dummy.b_state = 0; 1163 dummy.b_blocknr = -1000; 1164 error = isofs_get_block(inode, block, &dummy, 0); 1165 if (!error) 1166 return dummy.b_blocknr; 1167 return 0; 1168 } 1169 1170 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1171 { 1172 sector_t blknr = isofs_bmap(inode, block); 1173 if (!blknr) 1174 return NULL; 1175 return sb_bread(inode->i_sb, blknr); 1176 } 1177 1178 static int isofs_readpage(struct file *file, struct page *page) 1179 { 1180 return mpage_readpage(page, isofs_get_block); 1181 } 1182 1183 static void isofs_readahead(struct readahead_control *rac) 1184 { 1185 mpage_readahead(rac, isofs_get_block); 1186 } 1187 1188 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1189 { 1190 return generic_block_bmap(mapping,block,isofs_get_block); 1191 } 1192 1193 static const struct address_space_operations isofs_aops = { 1194 .readpage = isofs_readpage, 1195 .readahead = isofs_readahead, 1196 .bmap = _isofs_bmap 1197 }; 1198 1199 static int isofs_read_level3_size(struct inode *inode) 1200 { 1201 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1202 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1203 struct buffer_head *bh = NULL; 1204 unsigned long block, offset, block_saved, offset_saved; 1205 int i = 0; 1206 int more_entries = 0; 1207 struct iso_directory_record *tmpde = NULL; 1208 struct iso_inode_info *ei = ISOFS_I(inode); 1209 1210 inode->i_size = 0; 1211 1212 /* The first 16 blocks are reserved as the System Area. Thus, 1213 * no inodes can appear in block 0. We use this to flag that 1214 * this is the last section. */ 1215 ei->i_next_section_block = 0; 1216 ei->i_next_section_offset = 0; 1217 1218 block = ei->i_iget5_block; 1219 offset = ei->i_iget5_offset; 1220 1221 do { 1222 struct iso_directory_record *de; 1223 unsigned int de_len; 1224 1225 if (!bh) { 1226 bh = sb_bread(inode->i_sb, block); 1227 if (!bh) 1228 goto out_noread; 1229 } 1230 de = (struct iso_directory_record *) (bh->b_data + offset); 1231 de_len = *(unsigned char *) de; 1232 1233 if (de_len == 0) { 1234 brelse(bh); 1235 bh = NULL; 1236 ++block; 1237 offset = 0; 1238 continue; 1239 } 1240 1241 block_saved = block; 1242 offset_saved = offset; 1243 offset += de_len; 1244 1245 /* Make sure we have a full directory entry */ 1246 if (offset >= bufsize) { 1247 int slop = bufsize - offset + de_len; 1248 if (!tmpde) { 1249 tmpde = kmalloc(256, GFP_KERNEL); 1250 if (!tmpde) 1251 goto out_nomem; 1252 } 1253 memcpy(tmpde, de, slop); 1254 offset &= bufsize - 1; 1255 block++; 1256 brelse(bh); 1257 bh = NULL; 1258 if (offset) { 1259 bh = sb_bread(inode->i_sb, block); 1260 if (!bh) 1261 goto out_noread; 1262 memcpy((void *)tmpde+slop, bh->b_data, offset); 1263 } 1264 de = tmpde; 1265 } 1266 1267 inode->i_size += isonum_733(de->size); 1268 if (i == 1) { 1269 ei->i_next_section_block = block_saved; 1270 ei->i_next_section_offset = offset_saved; 1271 } 1272 1273 more_entries = de->flags[-high_sierra] & 0x80; 1274 1275 i++; 1276 if (i > 100) 1277 goto out_toomany; 1278 } while (more_entries); 1279 out: 1280 kfree(tmpde); 1281 if (bh) 1282 brelse(bh); 1283 return 0; 1284 1285 out_nomem: 1286 if (bh) 1287 brelse(bh); 1288 return -ENOMEM; 1289 1290 out_noread: 1291 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1292 kfree(tmpde); 1293 return -EIO; 1294 1295 out_toomany: 1296 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1297 "isofs_read_level3_size: inode=%lu\n", 1298 __func__, inode->i_ino); 1299 goto out; 1300 } 1301 1302 static int isofs_read_inode(struct inode *inode, int relocated) 1303 { 1304 struct super_block *sb = inode->i_sb; 1305 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1306 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1307 unsigned long block; 1308 int high_sierra = sbi->s_high_sierra; 1309 struct buffer_head *bh; 1310 struct iso_directory_record *de; 1311 struct iso_directory_record *tmpde = NULL; 1312 unsigned int de_len; 1313 unsigned long offset; 1314 struct iso_inode_info *ei = ISOFS_I(inode); 1315 int ret = -EIO; 1316 1317 block = ei->i_iget5_block; 1318 bh = sb_bread(inode->i_sb, block); 1319 if (!bh) 1320 goto out_badread; 1321 1322 offset = ei->i_iget5_offset; 1323 1324 de = (struct iso_directory_record *) (bh->b_data + offset); 1325 de_len = *(unsigned char *) de; 1326 1327 if (offset + de_len > bufsize) { 1328 int frag1 = bufsize - offset; 1329 1330 tmpde = kmalloc(de_len, GFP_KERNEL); 1331 if (!tmpde) { 1332 ret = -ENOMEM; 1333 goto fail; 1334 } 1335 memcpy(tmpde, bh->b_data + offset, frag1); 1336 brelse(bh); 1337 bh = sb_bread(inode->i_sb, ++block); 1338 if (!bh) 1339 goto out_badread; 1340 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1341 de = tmpde; 1342 } 1343 1344 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1345 ei->i_iget5_offset, 1346 ISOFS_BUFFER_BITS(inode)); 1347 1348 /* Assume it is a normal-format file unless told otherwise */ 1349 ei->i_file_format = isofs_file_normal; 1350 1351 if (de->flags[-high_sierra] & 2) { 1352 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1353 inode->i_mode = S_IFDIR | sbi->s_dmode; 1354 else 1355 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1356 set_nlink(inode, 1); /* 1357 * Set to 1. We know there are 2, but 1358 * the find utility tries to optimize 1359 * if it is 2, and it screws up. It is 1360 * easier to give 1 which tells find to 1361 * do it the hard way. 1362 */ 1363 } else { 1364 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1365 inode->i_mode = S_IFREG | sbi->s_fmode; 1366 } else { 1367 /* 1368 * Set default permissions: r-x for all. The disc 1369 * could be shared with DOS machines so virtually 1370 * anything could be a valid executable. 1371 */ 1372 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1373 } 1374 set_nlink(inode, 1); 1375 } 1376 inode->i_uid = sbi->s_uid; 1377 inode->i_gid = sbi->s_gid; 1378 inode->i_blocks = 0; 1379 1380 ei->i_format_parm[0] = 0; 1381 ei->i_format_parm[1] = 0; 1382 ei->i_format_parm[2] = 0; 1383 1384 ei->i_section_size = isonum_733(de->size); 1385 if (de->flags[-high_sierra] & 0x80) { 1386 ret = isofs_read_level3_size(inode); 1387 if (ret < 0) 1388 goto fail; 1389 ret = -EIO; 1390 } else { 1391 ei->i_next_section_block = 0; 1392 ei->i_next_section_offset = 0; 1393 inode->i_size = isonum_733(de->size); 1394 } 1395 1396 /* 1397 * Some dipshit decided to store some other bit of information 1398 * in the high byte of the file length. Truncate size in case 1399 * this CDROM was mounted with the cruft option. 1400 */ 1401 1402 if (sbi->s_cruft) 1403 inode->i_size &= 0x00ffffff; 1404 1405 if (de->interleave[0]) { 1406 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1407 inode->i_size = 0; 1408 } 1409 1410 /* I have no idea what file_unit_size is used for, so 1411 we will flag it for now */ 1412 if (de->file_unit_size[0] != 0) { 1413 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1414 inode->i_ino); 1415 } 1416 1417 /* I have no idea what other flag bits are used for, so 1418 we will flag it for now */ 1419 #ifdef DEBUG 1420 if((de->flags[-high_sierra] & ~2)!= 0){ 1421 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1422 "(%ld %x).\n", 1423 inode->i_ino, de->flags[-high_sierra]); 1424 } 1425 #endif 1426 1427 inode->i_mtime.tv_sec = 1428 inode->i_atime.tv_sec = 1429 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1430 inode->i_mtime.tv_nsec = 1431 inode->i_atime.tv_nsec = 1432 inode->i_ctime.tv_nsec = 0; 1433 1434 ei->i_first_extent = (isonum_733(de->extent) + 1435 isonum_711(de->ext_attr_length)); 1436 1437 /* Set the number of blocks for stat() - should be done before RR */ 1438 inode->i_blocks = (inode->i_size + 511) >> 9; 1439 1440 /* 1441 * Now test for possible Rock Ridge extensions which will override 1442 * some of these numbers in the inode structure. 1443 */ 1444 1445 if (!high_sierra) { 1446 parse_rock_ridge_inode(de, inode, relocated); 1447 /* if we want uid/gid set, override the rock ridge setting */ 1448 if (sbi->s_uid_set) 1449 inode->i_uid = sbi->s_uid; 1450 if (sbi->s_gid_set) 1451 inode->i_gid = sbi->s_gid; 1452 } 1453 /* Now set final access rights if overriding rock ridge setting */ 1454 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1455 sbi->s_dmode != ISOFS_INVALID_MODE) 1456 inode->i_mode = S_IFDIR | sbi->s_dmode; 1457 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1458 sbi->s_fmode != ISOFS_INVALID_MODE) 1459 inode->i_mode = S_IFREG | sbi->s_fmode; 1460 1461 /* Install the inode operations vector */ 1462 if (S_ISREG(inode->i_mode)) { 1463 inode->i_fop = &generic_ro_fops; 1464 switch (ei->i_file_format) { 1465 #ifdef CONFIG_ZISOFS 1466 case isofs_file_compressed: 1467 inode->i_data.a_ops = &zisofs_aops; 1468 break; 1469 #endif 1470 default: 1471 inode->i_data.a_ops = &isofs_aops; 1472 break; 1473 } 1474 } else if (S_ISDIR(inode->i_mode)) { 1475 inode->i_op = &isofs_dir_inode_operations; 1476 inode->i_fop = &isofs_dir_operations; 1477 } else if (S_ISLNK(inode->i_mode)) { 1478 inode->i_op = &page_symlink_inode_operations; 1479 inode_nohighmem(inode); 1480 inode->i_data.a_ops = &isofs_symlink_aops; 1481 } else 1482 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1483 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1484 1485 ret = 0; 1486 out: 1487 kfree(tmpde); 1488 if (bh) 1489 brelse(bh); 1490 return ret; 1491 1492 out_badread: 1493 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1494 fail: 1495 goto out; 1496 } 1497 1498 struct isofs_iget5_callback_data { 1499 unsigned long block; 1500 unsigned long offset; 1501 }; 1502 1503 static int isofs_iget5_test(struct inode *ino, void *data) 1504 { 1505 struct iso_inode_info *i = ISOFS_I(ino); 1506 struct isofs_iget5_callback_data *d = 1507 (struct isofs_iget5_callback_data*)data; 1508 return (i->i_iget5_block == d->block) 1509 && (i->i_iget5_offset == d->offset); 1510 } 1511 1512 static int isofs_iget5_set(struct inode *ino, void *data) 1513 { 1514 struct iso_inode_info *i = ISOFS_I(ino); 1515 struct isofs_iget5_callback_data *d = 1516 (struct isofs_iget5_callback_data*)data; 1517 i->i_iget5_block = d->block; 1518 i->i_iget5_offset = d->offset; 1519 return 0; 1520 } 1521 1522 /* Store, in the inode's containing structure, the block and block 1523 * offset that point to the underlying meta-data for the inode. The 1524 * code below is otherwise similar to the iget() code in 1525 * include/linux/fs.h */ 1526 struct inode *__isofs_iget(struct super_block *sb, 1527 unsigned long block, 1528 unsigned long offset, 1529 int relocated) 1530 { 1531 unsigned long hashval; 1532 struct inode *inode; 1533 struct isofs_iget5_callback_data data; 1534 long ret; 1535 1536 if (offset >= 1ul << sb->s_blocksize_bits) 1537 return ERR_PTR(-EINVAL); 1538 1539 data.block = block; 1540 data.offset = offset; 1541 1542 hashval = (block << sb->s_blocksize_bits) | offset; 1543 1544 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1545 &isofs_iget5_set, &data); 1546 1547 if (!inode) 1548 return ERR_PTR(-ENOMEM); 1549 1550 if (inode->i_state & I_NEW) { 1551 ret = isofs_read_inode(inode, relocated); 1552 if (ret < 0) { 1553 iget_failed(inode); 1554 inode = ERR_PTR(ret); 1555 } else { 1556 unlock_new_inode(inode); 1557 } 1558 } 1559 1560 return inode; 1561 } 1562 1563 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1564 int flags, const char *dev_name, void *data) 1565 { 1566 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1567 } 1568 1569 static struct file_system_type iso9660_fs_type = { 1570 .owner = THIS_MODULE, 1571 .name = "iso9660", 1572 .mount = isofs_mount, 1573 .kill_sb = kill_block_super, 1574 .fs_flags = FS_REQUIRES_DEV, 1575 }; 1576 MODULE_ALIAS_FS("iso9660"); 1577 MODULE_ALIAS("iso9660"); 1578 1579 static int __init init_iso9660_fs(void) 1580 { 1581 int err = init_inodecache(); 1582 if (err) 1583 goto out; 1584 #ifdef CONFIG_ZISOFS 1585 err = zisofs_init(); 1586 if (err) 1587 goto out1; 1588 #endif 1589 err = register_filesystem(&iso9660_fs_type); 1590 if (err) 1591 goto out2; 1592 return 0; 1593 out2: 1594 #ifdef CONFIG_ZISOFS 1595 zisofs_cleanup(); 1596 out1: 1597 #endif 1598 destroy_inodecache(); 1599 out: 1600 return err; 1601 } 1602 1603 static void __exit exit_iso9660_fs(void) 1604 { 1605 unregister_filesystem(&iso9660_fs_type); 1606 #ifdef CONFIG_ZISOFS 1607 zisofs_cleanup(); 1608 #endif 1609 destroy_inodecache(); 1610 } 1611 1612 module_init(init_iso9660_fs) 1613 module_exit(exit_iso9660_fs) 1614 MODULE_LICENSE("GPL"); 1615