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 unsigned int uv; 343 344 popt->map = 'n'; 345 popt->rock = 1; 346 popt->joliet = 1; 347 popt->cruft = 0; 348 popt->hide = 0; 349 popt->showassoc = 0; 350 popt->check = 'u'; /* unset */ 351 popt->nocompress = 0; 352 popt->blocksize = 1024; 353 popt->fmode = popt->dmode = ISOFS_INVALID_MODE; 354 popt->uid_set = 0; 355 popt->gid_set = 0; 356 popt->gid = GLOBAL_ROOT_GID; 357 popt->uid = GLOBAL_ROOT_UID; 358 popt->iocharset = NULL; 359 popt->utf8 = 0; 360 popt->overriderockperm = 0; 361 popt->session=-1; 362 popt->sbsector=-1; 363 if (!options) 364 return 1; 365 366 while ((p = strsep(&options, ",")) != NULL) { 367 int token; 368 substring_t args[MAX_OPT_ARGS]; 369 unsigned n; 370 371 if (!*p) 372 continue; 373 374 token = match_token(p, tokens, args); 375 switch (token) { 376 case Opt_norock: 377 popt->rock = 0; 378 break; 379 case Opt_nojoliet: 380 popt->joliet = 0; 381 break; 382 case Opt_hide: 383 popt->hide = 1; 384 break; 385 case Opt_unhide: 386 case Opt_showassoc: 387 popt->showassoc = 1; 388 break; 389 case Opt_cruft: 390 popt->cruft = 1; 391 break; 392 case Opt_utf8: 393 popt->utf8 = 1; 394 break; 395 #ifdef CONFIG_JOLIET 396 case Opt_iocharset: 397 kfree(popt->iocharset); 398 popt->iocharset = match_strdup(&args[0]); 399 if (!popt->iocharset) 400 return 0; 401 break; 402 #endif 403 case Opt_map_a: 404 popt->map = 'a'; 405 break; 406 case Opt_map_o: 407 popt->map = 'o'; 408 break; 409 case Opt_map_n: 410 popt->map = 'n'; 411 break; 412 case Opt_session: 413 if (match_int(&args[0], &option)) 414 return 0; 415 n = option; 416 /* 417 * Track numbers are supposed to be in range 1-99, the 418 * mount option starts indexing at 0. 419 */ 420 if (n >= 99) 421 return 0; 422 popt->session = n + 1; 423 break; 424 case Opt_sb: 425 if (match_int(&args[0], &option)) 426 return 0; 427 popt->sbsector = option; 428 break; 429 case Opt_check_r: 430 popt->check = 'r'; 431 break; 432 case Opt_check_s: 433 popt->check = 's'; 434 break; 435 case Opt_ignore: 436 break; 437 case Opt_uid: 438 if (match_uint(&args[0], &uv)) 439 return 0; 440 popt->uid = make_kuid(current_user_ns(), uv); 441 if (!uid_valid(popt->uid)) 442 return 0; 443 popt->uid_set = 1; 444 break; 445 case Opt_gid: 446 if (match_uint(&args[0], &uv)) 447 return 0; 448 popt->gid = make_kgid(current_user_ns(), uv); 449 if (!gid_valid(popt->gid)) 450 return 0; 451 popt->gid_set = 1; 452 break; 453 case Opt_mode: 454 if (match_int(&args[0], &option)) 455 return 0; 456 popt->fmode = option; 457 break; 458 case Opt_dmode: 459 if (match_int(&args[0], &option)) 460 return 0; 461 popt->dmode = option; 462 break; 463 case Opt_overriderockperm: 464 popt->overriderockperm = 1; 465 break; 466 case Opt_block: 467 if (match_int(&args[0], &option)) 468 return 0; 469 n = option; 470 if (n != 512 && n != 1024 && n != 2048) 471 return 0; 472 popt->blocksize = n; 473 break; 474 case Opt_nocompress: 475 popt->nocompress = 1; 476 break; 477 default: 478 return 0; 479 } 480 } 481 return 1; 482 } 483 484 /* 485 * Display the mount options in /proc/mounts. 486 */ 487 static int isofs_show_options(struct seq_file *m, struct dentry *root) 488 { 489 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 490 491 if (!sbi->s_rock) seq_puts(m, ",norock"); 492 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 493 if (sbi->s_cruft) seq_puts(m, ",cruft"); 494 if (sbi->s_hide) seq_puts(m, ",hide"); 495 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 496 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 497 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 498 if (sbi->s_utf8) seq_puts(m, ",utf8"); 499 500 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 501 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 502 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 503 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 504 505 if (root->d_sb->s_blocksize != 1024) 506 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 507 508 if (sbi->s_uid_set) 509 seq_printf(m, ",uid=%u", 510 from_kuid_munged(&init_user_ns, sbi->s_uid)); 511 if (sbi->s_gid_set) 512 seq_printf(m, ",gid=%u", 513 from_kgid_munged(&init_user_ns, sbi->s_gid)); 514 515 if (sbi->s_dmode != ISOFS_INVALID_MODE) 516 seq_printf(m, ",dmode=%o", sbi->s_dmode); 517 if (sbi->s_fmode != ISOFS_INVALID_MODE) 518 seq_printf(m, ",fmode=%o", sbi->s_fmode); 519 520 #ifdef CONFIG_JOLIET 521 if (sbi->s_nls_iocharset && 522 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) 523 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 524 #endif 525 return 0; 526 } 527 528 /* 529 * look if the driver can tell the multi session redirection value 530 * 531 * don't change this if you don't know what you do, please! 532 * Multisession is legal only with XA disks. 533 * A non-XA disk with more than one volume descriptor may do it right, but 534 * usually is written in a nowhere standardized "multi-partition" manner. 535 * Multisession uses absolute addressing (solely the first frame of the whole 536 * track is #0), multi-partition uses relative addressing (each first frame of 537 * each track is #0), and a track is not a session. 538 * 539 * A broken CDwriter software or drive firmware does not set new standards, 540 * at least not if conflicting with the existing ones. 541 * 542 * emoenke@gwdg.de 543 */ 544 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 545 546 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 547 { 548 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); 549 unsigned int vol_desc_start = 0; 550 551 if (session > 0) { 552 struct cdrom_tocentry te; 553 554 if (!cdi) 555 return 0; 556 557 te.cdte_track = session; 558 te.cdte_format = CDROM_LBA; 559 if (cdrom_read_tocentry(cdi, &te) == 0) { 560 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 561 session, te.cdte_addr.lba, 562 te.cdte_ctrl & CDROM_DATA_TRACK); 563 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4) 564 return te.cdte_addr.lba; 565 } 566 567 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 568 } 569 570 if (cdi) { 571 struct cdrom_multisession ms_info; 572 573 ms_info.addr_format = CDROM_LBA; 574 if (cdrom_multisession(cdi, &ms_info) == 0) { 575 #if WE_OBEY_THE_WRITTEN_STANDARDS 576 /* necessary for a valid ms_info.addr */ 577 if (ms_info.xa_flag) 578 #endif 579 vol_desc_start = ms_info.addr.lba; 580 } 581 } 582 583 return vol_desc_start; 584 } 585 586 /* 587 * Check if root directory is empty (has less than 3 files). 588 * 589 * Used to detect broken CDs where ISO root directory is empty but Joliet root 590 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 591 * (and Joliet used instead) or else no files would be visible. 592 */ 593 static bool rootdir_empty(struct super_block *sb, unsigned long block) 594 { 595 int offset = 0, files = 0, de_len; 596 struct iso_directory_record *de; 597 struct buffer_head *bh; 598 599 bh = sb_bread(sb, block); 600 if (!bh) 601 return true; 602 while (files < 3) { 603 de = (struct iso_directory_record *) (bh->b_data + offset); 604 de_len = *(unsigned char *) de; 605 if (de_len == 0) 606 break; 607 files++; 608 offset += de_len; 609 } 610 brelse(bh); 611 return files < 3; 612 } 613 614 /* 615 * Initialize the superblock and read the root inode. 616 */ 617 static int isofs_fill_super(struct super_block *s, void *data, int silent) 618 { 619 struct buffer_head *bh = NULL, *pri_bh = NULL; 620 struct hs_primary_descriptor *h_pri = NULL; 621 struct iso_primary_descriptor *pri = NULL; 622 struct iso_supplementary_descriptor *sec = NULL; 623 struct iso_directory_record *rootp; 624 struct inode *inode; 625 struct iso9660_options opt; 626 struct isofs_sb_info *sbi; 627 unsigned long first_data_zone; 628 int joliet_level = 0; 629 int iso_blknum, block; 630 int orig_zonesize; 631 int table, error = -EINVAL; 632 unsigned int vol_desc_start; 633 634 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 635 if (!sbi) 636 return -ENOMEM; 637 s->s_fs_info = sbi; 638 639 if (!parse_options((char *)data, &opt)) 640 goto out_freesbi; 641 642 /* 643 * First of all, get the hardware blocksize for this device. 644 * If we don't know what it is, or the hardware blocksize is 645 * larger than the blocksize the user specified, then use 646 * that value. 647 */ 648 /* 649 * What if bugger tells us to go beyond page size? 650 */ 651 if (bdev_logical_block_size(s->s_bdev) > 2048) { 652 printk(KERN_WARNING 653 "ISOFS: unsupported/invalid hardware sector size %d\n", 654 bdev_logical_block_size(s->s_bdev)); 655 goto out_freesbi; 656 } 657 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 658 659 sbi->s_high_sierra = 0; /* default is iso9660 */ 660 sbi->s_session = opt.session; 661 sbi->s_sbsector = opt.sbsector; 662 663 vol_desc_start = (opt.sbsector != -1) ? 664 opt.sbsector : isofs_get_last_session(s,opt.session); 665 666 for (iso_blknum = vol_desc_start+16; 667 iso_blknum < vol_desc_start+100; iso_blknum++) { 668 struct hs_volume_descriptor *hdp; 669 struct iso_volume_descriptor *vdp; 670 671 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 672 if (!(bh = sb_bread(s, block))) 673 goto out_no_read; 674 675 vdp = (struct iso_volume_descriptor *)bh->b_data; 676 hdp = (struct hs_volume_descriptor *)bh->b_data; 677 678 /* 679 * Due to the overlapping physical location of the descriptors, 680 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 681 * proper identification in this case, we first check for ISO. 682 */ 683 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 684 if (isonum_711(vdp->type) == ISO_VD_END) 685 break; 686 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 687 if (!pri) { 688 pri = (struct iso_primary_descriptor *)vdp; 689 /* Save the buffer in case we need it ... */ 690 pri_bh = bh; 691 bh = NULL; 692 } 693 } 694 #ifdef CONFIG_JOLIET 695 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 696 sec = (struct iso_supplementary_descriptor *)vdp; 697 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 698 if (opt.joliet) { 699 if (sec->escape[2] == 0x40) 700 joliet_level = 1; 701 else if (sec->escape[2] == 0x43) 702 joliet_level = 2; 703 else if (sec->escape[2] == 0x45) 704 joliet_level = 3; 705 706 printk(KERN_DEBUG "ISO 9660 Extensions: " 707 "Microsoft Joliet Level %d\n", 708 joliet_level); 709 } 710 goto root_found; 711 } else { 712 /* Unknown supplementary volume descriptor */ 713 sec = NULL; 714 } 715 } 716 #endif 717 } else { 718 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 719 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 720 goto out_freebh; 721 722 sbi->s_high_sierra = 1; 723 opt.rock = 0; 724 h_pri = (struct hs_primary_descriptor *)vdp; 725 goto root_found; 726 } 727 } 728 729 /* Just skip any volume descriptors we don't recognize */ 730 731 brelse(bh); 732 bh = NULL; 733 } 734 /* 735 * If we fall through, either no volume descriptor was found, 736 * or else we passed a primary descriptor looking for others. 737 */ 738 if (!pri) 739 goto out_unknown_format; 740 brelse(bh); 741 bh = pri_bh; 742 pri_bh = NULL; 743 744 root_found: 745 /* We don't support read-write mounts */ 746 if (!sb_rdonly(s)) { 747 error = -EACCES; 748 goto out_freebh; 749 } 750 751 if (joliet_level && (!pri || !opt.rock)) { 752 /* This is the case of Joliet with the norock mount flag. 753 * A disc with both Joliet and Rock Ridge is handled later 754 */ 755 pri = (struct iso_primary_descriptor *) sec; 756 } 757 758 if(sbi->s_high_sierra){ 759 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 760 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 761 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 762 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 763 } else { 764 if (!pri) 765 goto out_freebh; 766 rootp = (struct iso_directory_record *) pri->root_directory_record; 767 sbi->s_nzones = isonum_733(pri->volume_space_size); 768 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 769 sbi->s_max_size = isonum_733(pri->volume_space_size); 770 } 771 772 sbi->s_ninodes = 0; /* No way to figure this out easily */ 773 774 orig_zonesize = sbi->s_log_zone_size; 775 /* 776 * If the zone size is smaller than the hardware sector size, 777 * this is a fatal error. This would occur if the disc drive 778 * had sectors that were 2048 bytes, but the filesystem had 779 * blocks that were 512 bytes (which should only very rarely 780 * happen.) 781 */ 782 if (orig_zonesize < opt.blocksize) 783 goto out_bad_size; 784 785 /* RDE: convert log zone size to bit shift */ 786 switch (sbi->s_log_zone_size) { 787 case 512: sbi->s_log_zone_size = 9; break; 788 case 1024: sbi->s_log_zone_size = 10; break; 789 case 2048: sbi->s_log_zone_size = 11; break; 790 791 default: 792 goto out_bad_zone_size; 793 } 794 795 s->s_magic = ISOFS_SUPER_MAGIC; 796 797 /* 798 * With multi-extent files, file size is only limited by the maximum 799 * size of a file system, which is 8 TB. 800 */ 801 s->s_maxbytes = 0x80000000000LL; 802 803 /* ECMA-119 timestamp from 1900/1/1 with tz offset */ 804 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET; 805 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET; 806 807 /* Set this for reference. Its not currently used except on write 808 which we don't have .. */ 809 810 first_data_zone = isonum_733(rootp->extent) + 811 isonum_711(rootp->ext_attr_length); 812 sbi->s_firstdatazone = first_data_zone; 813 #ifndef BEQUIET 814 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 815 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 816 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 817 if(sbi->s_high_sierra) 818 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 819 #endif 820 821 /* 822 * If the Joliet level is set, we _may_ decide to use the 823 * secondary descriptor, but can't be sure until after we 824 * read the root inode. But before reading the root inode 825 * we may need to change the device blocksize, and would 826 * rather release the old buffer first. So, we cache the 827 * first_data_zone value from the secondary descriptor. 828 */ 829 if (joliet_level) { 830 pri = (struct iso_primary_descriptor *) sec; 831 rootp = (struct iso_directory_record *) 832 pri->root_directory_record; 833 first_data_zone = isonum_733(rootp->extent) + 834 isonum_711(rootp->ext_attr_length); 835 } 836 837 /* 838 * We're all done using the volume descriptor, and may need 839 * to change the device blocksize, so release the buffer now. 840 */ 841 brelse(pri_bh); 842 brelse(bh); 843 844 /* 845 * Force the blocksize to 512 for 512 byte sectors. The file 846 * read primitives really get it wrong in a bad way if we don't 847 * do this. 848 * 849 * Note - we should never be setting the blocksize to something 850 * less than the hardware sector size for the device. If we 851 * do, we would end up having to read larger buffers and split 852 * out portions to satisfy requests. 853 * 854 * Note2- the idea here is that we want to deal with the optimal 855 * zonesize in the filesystem. If we have it set to something less, 856 * then we have horrible problems with trying to piece together 857 * bits of adjacent blocks in order to properly read directory 858 * entries. By forcing the blocksize in this way, we ensure 859 * that we will never be required to do this. 860 */ 861 sb_set_blocksize(s, orig_zonesize); 862 863 sbi->s_nls_iocharset = NULL; 864 865 #ifdef CONFIG_JOLIET 866 if (joliet_level && opt.utf8 == 0) { 867 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 868 sbi->s_nls_iocharset = load_nls(p); 869 if (! sbi->s_nls_iocharset) { 870 /* Fail only if explicit charset specified */ 871 if (opt.iocharset) 872 goto out_freesbi; 873 sbi->s_nls_iocharset = load_nls_default(); 874 } 875 } 876 #endif 877 s->s_op = &isofs_sops; 878 s->s_export_op = &isofs_export_ops; 879 sbi->s_mapping = opt.map; 880 sbi->s_rock = (opt.rock ? 2 : 0); 881 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 882 sbi->s_cruft = opt.cruft; 883 sbi->s_hide = opt.hide; 884 sbi->s_showassoc = opt.showassoc; 885 sbi->s_uid = opt.uid; 886 sbi->s_gid = opt.gid; 887 sbi->s_uid_set = opt.uid_set; 888 sbi->s_gid_set = opt.gid_set; 889 sbi->s_utf8 = opt.utf8; 890 sbi->s_nocompress = opt.nocompress; 891 sbi->s_overriderockperm = opt.overriderockperm; 892 /* 893 * It would be incredibly stupid to allow people to mark every file 894 * on the disk as suid, so we merely allow them to set the default 895 * permissions. 896 */ 897 if (opt.fmode != ISOFS_INVALID_MODE) 898 sbi->s_fmode = opt.fmode & 0777; 899 else 900 sbi->s_fmode = ISOFS_INVALID_MODE; 901 if (opt.dmode != ISOFS_INVALID_MODE) 902 sbi->s_dmode = opt.dmode & 0777; 903 else 904 sbi->s_dmode = ISOFS_INVALID_MODE; 905 906 /* 907 * Read the root inode, which _may_ result in changing 908 * the s_rock flag. Once we have the final s_rock value, 909 * we then decide whether to use the Joliet descriptor. 910 */ 911 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 912 if (IS_ERR(inode)) 913 goto out_no_root; 914 915 /* 916 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 917 * correct Joliet root directory. 918 */ 919 if (sbi->s_rock == 1 && joliet_level && 920 rootdir_empty(s, sbi->s_firstdatazone)) { 921 printk(KERN_NOTICE 922 "ISOFS: primary root directory is empty. " 923 "Disabling Rock Ridge and switching to Joliet."); 924 sbi->s_rock = 0; 925 } 926 927 /* 928 * If this disk has both Rock Ridge and Joliet on it, then we 929 * want to use Rock Ridge by default. This can be overridden 930 * by using the norock mount option. There is still one other 931 * possibility that is not taken into account: a Rock Ridge 932 * CD with Unicode names. Until someone sees such a beast, it 933 * will not be supported. 934 */ 935 if (sbi->s_rock == 1) { 936 joliet_level = 0; 937 } else if (joliet_level) { 938 sbi->s_rock = 0; 939 if (sbi->s_firstdatazone != first_data_zone) { 940 sbi->s_firstdatazone = first_data_zone; 941 printk(KERN_DEBUG 942 "ISOFS: changing to secondary root\n"); 943 iput(inode); 944 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 945 if (IS_ERR(inode)) 946 goto out_no_root; 947 } 948 } 949 950 if (opt.check == 'u') { 951 /* Only Joliet is case insensitive by default */ 952 if (joliet_level) 953 opt.check = 'r'; 954 else 955 opt.check = 's'; 956 } 957 sbi->s_joliet_level = joliet_level; 958 959 /* Make sure the root inode is a directory */ 960 if (!S_ISDIR(inode->i_mode)) { 961 printk(KERN_WARNING 962 "isofs_fill_super: root inode is not a directory. " 963 "Corrupted media?\n"); 964 goto out_iput; 965 } 966 967 table = 0; 968 if (joliet_level) 969 table += 2; 970 if (opt.check == 'r') 971 table++; 972 sbi->s_check = opt.check; 973 974 if (table) 975 s->s_d_op = &isofs_dentry_ops[table - 1]; 976 977 /* get the root dentry */ 978 s->s_root = d_make_root(inode); 979 if (!(s->s_root)) { 980 error = -ENOMEM; 981 goto out_no_inode; 982 } 983 984 kfree(opt.iocharset); 985 986 return 0; 987 988 /* 989 * Display error messages and free resources. 990 */ 991 out_iput: 992 iput(inode); 993 goto out_no_inode; 994 out_no_root: 995 error = PTR_ERR(inode); 996 if (error != -ENOMEM) 997 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 998 out_no_inode: 999 #ifdef CONFIG_JOLIET 1000 unload_nls(sbi->s_nls_iocharset); 1001 #endif 1002 goto out_freesbi; 1003 out_no_read: 1004 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 1005 __func__, s->s_id, iso_blknum, block); 1006 goto out_freebh; 1007 out_bad_zone_size: 1008 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 1009 sbi->s_log_zone_size); 1010 goto out_freebh; 1011 out_bad_size: 1012 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 1013 orig_zonesize, opt.blocksize); 1014 goto out_freebh; 1015 out_unknown_format: 1016 if (!silent) 1017 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1018 1019 out_freebh: 1020 brelse(bh); 1021 brelse(pri_bh); 1022 out_freesbi: 1023 kfree(opt.iocharset); 1024 kfree(sbi); 1025 s->s_fs_info = NULL; 1026 return error; 1027 } 1028 1029 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1030 { 1031 struct super_block *sb = dentry->d_sb; 1032 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1033 1034 buf->f_type = ISOFS_SUPER_MAGIC; 1035 buf->f_bsize = sb->s_blocksize; 1036 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1037 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1038 buf->f_bfree = 0; 1039 buf->f_bavail = 0; 1040 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1041 buf->f_ffree = 0; 1042 buf->f_fsid = u64_to_fsid(id); 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