1 /* 2 * linux/fs/isofs/inode.c 3 * 4 * (C) 1991 Linus Torvalds - minix filesystem 5 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem. 6 * 1994 Eberhard Mönkeberg - multi session handling. 7 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs. 8 * 1997 Gordon Chaffee - Joliet CDs 9 * 1998 Eric Lammerts - ISO 9660 Level 3 10 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB 11 * 2004 Paul Serice - NFS Export Operations 12 */ 13 14 #include <linux/init.h> 15 #include <linux/module.h> 16 17 #include <linux/slab.h> 18 #include <linux/cred.h> 19 #include <linux/nls.h> 20 #include <linux/ctype.h> 21 #include <linux/statfs.h> 22 #include <linux/cdrom.h> 23 #include <linux/parser.h> 24 #include <linux/mpage.h> 25 #include <linux/user_namespace.h> 26 #include <linux/seq_file.h> 27 #include <linux/blkdev.h> 28 29 #include "isofs.h" 30 #include "zisofs.h" 31 32 #define BEQUIET 33 34 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); 35 static int isofs_dentry_cmpi(const struct dentry *dentry, 36 unsigned int len, const char *str, const struct qstr *name); 37 38 #ifdef CONFIG_JOLIET 39 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); 40 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); 41 static int isofs_dentry_cmpi_ms(const struct dentry *dentry, 42 unsigned int len, const char *str, const struct qstr *name); 43 static int isofs_dentry_cmp_ms(const struct dentry *dentry, 44 unsigned int len, const char *str, const struct qstr *name); 45 #endif 46 47 static void isofs_put_super(struct super_block *sb) 48 { 49 struct isofs_sb_info *sbi = ISOFS_SB(sb); 50 51 #ifdef CONFIG_JOLIET 52 unload_nls(sbi->s_nls_iocharset); 53 #endif 54 55 kfree(sbi); 56 sb->s_fs_info = NULL; 57 return; 58 } 59 60 static int isofs_read_inode(struct inode *, int relocated); 61 static int isofs_statfs (struct dentry *, struct kstatfs *); 62 static int isofs_show_options(struct seq_file *, struct dentry *); 63 64 static struct kmem_cache *isofs_inode_cachep; 65 66 static struct inode *isofs_alloc_inode(struct super_block *sb) 67 { 68 struct iso_inode_info *ei; 69 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); 70 if (!ei) 71 return NULL; 72 return &ei->vfs_inode; 73 } 74 75 static void isofs_i_callback(struct rcu_head *head) 76 { 77 struct inode *inode = container_of(head, struct inode, i_rcu); 78 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 79 } 80 81 static void isofs_destroy_inode(struct inode *inode) 82 { 83 call_rcu(&inode->i_rcu, isofs_i_callback); 84 } 85 86 static void init_once(void *foo) 87 { 88 struct iso_inode_info *ei = foo; 89 90 inode_init_once(&ei->vfs_inode); 91 } 92 93 static int __init init_inodecache(void) 94 { 95 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", 96 sizeof(struct iso_inode_info), 97 0, (SLAB_RECLAIM_ACCOUNT| 98 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 99 init_once); 100 if (!isofs_inode_cachep) 101 return -ENOMEM; 102 return 0; 103 } 104 105 static void destroy_inodecache(void) 106 { 107 /* 108 * Make sure all delayed rcu free inodes are flushed before we 109 * destroy cache. 110 */ 111 rcu_barrier(); 112 kmem_cache_destroy(isofs_inode_cachep); 113 } 114 115 static int isofs_remount(struct super_block *sb, int *flags, char *data) 116 { 117 sync_filesystem(sb); 118 if (!(*flags & SB_RDONLY)) 119 return -EROFS; 120 return 0; 121 } 122 123 static const struct super_operations isofs_sops = { 124 .alloc_inode = isofs_alloc_inode, 125 .destroy_inode = isofs_destroy_inode, 126 .put_super = isofs_put_super, 127 .statfs = isofs_statfs, 128 .remount_fs = isofs_remount, 129 .show_options = isofs_show_options, 130 }; 131 132 133 static const struct dentry_operations isofs_dentry_ops[] = { 134 { 135 .d_hash = isofs_hashi, 136 .d_compare = isofs_dentry_cmpi, 137 }, 138 #ifdef CONFIG_JOLIET 139 { 140 .d_hash = isofs_hash_ms, 141 .d_compare = isofs_dentry_cmp_ms, 142 }, 143 { 144 .d_hash = isofs_hashi_ms, 145 .d_compare = isofs_dentry_cmpi_ms, 146 }, 147 #endif 148 }; 149 150 struct iso9660_options{ 151 unsigned int rock:1; 152 unsigned int joliet:1; 153 unsigned int cruft:1; 154 unsigned int hide:1; 155 unsigned int showassoc:1; 156 unsigned int nocompress:1; 157 unsigned int overriderockperm:1; 158 unsigned int uid_set:1; 159 unsigned int gid_set:1; 160 unsigned int utf8:1; 161 unsigned char map; 162 unsigned char check; 163 unsigned int blocksize; 164 umode_t fmode; 165 umode_t dmode; 166 kgid_t gid; 167 kuid_t uid; 168 char *iocharset; 169 /* LVE */ 170 s32 session; 171 s32 sbsector; 172 }; 173 174 /* 175 * Compute the hash for the isofs name corresponding to the dentry. 176 */ 177 static int 178 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) 179 { 180 const char *name; 181 int len; 182 char c; 183 unsigned long hash; 184 185 len = qstr->len; 186 name = qstr->name; 187 if (ms) { 188 while (len && name[len-1] == '.') 189 len--; 190 } 191 192 hash = init_name_hash(dentry); 193 while (len--) { 194 c = tolower(*name++); 195 hash = partial_name_hash(c, hash); 196 } 197 qstr->hash = end_name_hash(hash); 198 199 return 0; 200 } 201 202 /* 203 * Compare of two isofs names. 204 */ 205 static int isofs_dentry_cmp_common( 206 unsigned int len, const char *str, 207 const struct qstr *name, int ms, int ci) 208 { 209 int alen, blen; 210 211 /* A filename cannot end in '.' or we treat it like it has none */ 212 alen = name->len; 213 blen = len; 214 if (ms) { 215 while (alen && name->name[alen-1] == '.') 216 alen--; 217 while (blen && str[blen-1] == '.') 218 blen--; 219 } 220 if (alen == blen) { 221 if (ci) { 222 if (strncasecmp(name->name, str, alen) == 0) 223 return 0; 224 } else { 225 if (strncmp(name->name, str, alen) == 0) 226 return 0; 227 } 228 } 229 return 1; 230 } 231 232 static int 233 isofs_hashi(const struct dentry *dentry, struct qstr *qstr) 234 { 235 return isofs_hashi_common(dentry, qstr, 0); 236 } 237 238 static int 239 isofs_dentry_cmpi(const struct dentry *dentry, 240 unsigned int len, const char *str, const struct qstr *name) 241 { 242 return isofs_dentry_cmp_common(len, str, name, 0, 1); 243 } 244 245 #ifdef CONFIG_JOLIET 246 /* 247 * Compute the hash for the isofs name corresponding to the dentry. 248 */ 249 static int 250 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) 251 { 252 const char *name; 253 int len; 254 255 len = qstr->len; 256 name = qstr->name; 257 if (ms) { 258 while (len && name[len-1] == '.') 259 len--; 260 } 261 262 qstr->hash = full_name_hash(dentry, name, len); 263 264 return 0; 265 } 266 267 static int 268 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) 269 { 270 return isofs_hash_common(dentry, qstr, 1); 271 } 272 273 static int 274 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) 275 { 276 return isofs_hashi_common(dentry, qstr, 1); 277 } 278 279 static int 280 isofs_dentry_cmp_ms(const struct dentry *dentry, 281 unsigned int len, const char *str, const struct qstr *name) 282 { 283 return isofs_dentry_cmp_common(len, str, name, 1, 0); 284 } 285 286 static int 287 isofs_dentry_cmpi_ms(const struct dentry *dentry, 288 unsigned int len, const char *str, const struct qstr *name) 289 { 290 return isofs_dentry_cmp_common(len, str, name, 1, 1); 291 } 292 #endif 293 294 enum { 295 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, 296 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, 297 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, 298 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, 299 }; 300 301 static const match_table_t tokens = { 302 {Opt_norock, "norock"}, 303 {Opt_nojoliet, "nojoliet"}, 304 {Opt_unhide, "unhide"}, 305 {Opt_hide, "hide"}, 306 {Opt_showassoc, "showassoc"}, 307 {Opt_cruft, "cruft"}, 308 {Opt_utf8, "utf8"}, 309 {Opt_iocharset, "iocharset=%s"}, 310 {Opt_map_a, "map=acorn"}, 311 {Opt_map_a, "map=a"}, 312 {Opt_map_n, "map=normal"}, 313 {Opt_map_n, "map=n"}, 314 {Opt_map_o, "map=off"}, 315 {Opt_map_o, "map=o"}, 316 {Opt_session, "session=%u"}, 317 {Opt_sb, "sbsector=%u"}, 318 {Opt_check_r, "check=relaxed"}, 319 {Opt_check_r, "check=r"}, 320 {Opt_check_s, "check=strict"}, 321 {Opt_check_s, "check=s"}, 322 {Opt_uid, "uid=%u"}, 323 {Opt_gid, "gid=%u"}, 324 {Opt_mode, "mode=%u"}, 325 {Opt_dmode, "dmode=%u"}, 326 {Opt_overriderockperm, "overriderockperm"}, 327 {Opt_block, "block=%u"}, 328 {Opt_ignore, "conv=binary"}, 329 {Opt_ignore, "conv=b"}, 330 {Opt_ignore, "conv=text"}, 331 {Opt_ignore, "conv=t"}, 332 {Opt_ignore, "conv=mtext"}, 333 {Opt_ignore, "conv=m"}, 334 {Opt_ignore, "conv=auto"}, 335 {Opt_ignore, "conv=a"}, 336 {Opt_nocompress, "nocompress"}, 337 {Opt_err, NULL} 338 }; 339 340 static int parse_options(char *options, struct iso9660_options *popt) 341 { 342 char *p; 343 int option; 344 345 popt->map = 'n'; 346 popt->rock = 1; 347 popt->joliet = 1; 348 popt->cruft = 0; 349 popt->hide = 0; 350 popt->showassoc = 0; 351 popt->check = 'u'; /* unset */ 352 popt->nocompress = 0; 353 popt->blocksize = 1024; 354 popt->fmode = popt->dmode = ISOFS_INVALID_MODE; 355 popt->uid_set = 0; 356 popt->gid_set = 0; 357 popt->gid = GLOBAL_ROOT_GID; 358 popt->uid = GLOBAL_ROOT_UID; 359 popt->iocharset = NULL; 360 popt->utf8 = 0; 361 popt->overriderockperm = 0; 362 popt->session=-1; 363 popt->sbsector=-1; 364 if (!options) 365 return 1; 366 367 while ((p = strsep(&options, ",")) != NULL) { 368 int token; 369 substring_t args[MAX_OPT_ARGS]; 370 unsigned n; 371 372 if (!*p) 373 continue; 374 375 token = match_token(p, tokens, args); 376 switch (token) { 377 case Opt_norock: 378 popt->rock = 0; 379 break; 380 case Opt_nojoliet: 381 popt->joliet = 0; 382 break; 383 case Opt_hide: 384 popt->hide = 1; 385 break; 386 case Opt_unhide: 387 case Opt_showassoc: 388 popt->showassoc = 1; 389 break; 390 case Opt_cruft: 391 popt->cruft = 1; 392 break; 393 case Opt_utf8: 394 popt->utf8 = 1; 395 break; 396 #ifdef CONFIG_JOLIET 397 case Opt_iocharset: 398 kfree(popt->iocharset); 399 popt->iocharset = match_strdup(&args[0]); 400 if (!popt->iocharset) 401 return 0; 402 break; 403 #endif 404 case Opt_map_a: 405 popt->map = 'a'; 406 break; 407 case Opt_map_o: 408 popt->map = 'o'; 409 break; 410 case Opt_map_n: 411 popt->map = 'n'; 412 break; 413 case Opt_session: 414 if (match_int(&args[0], &option)) 415 return 0; 416 n = option; 417 /* 418 * Track numbers are supposed to be in range 1-99, the 419 * mount option starts indexing at 0. 420 */ 421 if (n >= 99) 422 return 0; 423 popt->session = n + 1; 424 break; 425 case Opt_sb: 426 if (match_int(&args[0], &option)) 427 return 0; 428 popt->sbsector = option; 429 break; 430 case Opt_check_r: 431 popt->check = 'r'; 432 break; 433 case Opt_check_s: 434 popt->check = 's'; 435 break; 436 case Opt_ignore: 437 break; 438 case Opt_uid: 439 if (match_int(&args[0], &option)) 440 return 0; 441 popt->uid = make_kuid(current_user_ns(), option); 442 if (!uid_valid(popt->uid)) 443 return 0; 444 popt->uid_set = 1; 445 break; 446 case Opt_gid: 447 if (match_int(&args[0], &option)) 448 return 0; 449 popt->gid = make_kgid(current_user_ns(), option); 450 if (!gid_valid(popt->gid)) 451 return 0; 452 popt->gid_set = 1; 453 break; 454 case Opt_mode: 455 if (match_int(&args[0], &option)) 456 return 0; 457 popt->fmode = option; 458 break; 459 case Opt_dmode: 460 if (match_int(&args[0], &option)) 461 return 0; 462 popt->dmode = option; 463 break; 464 case Opt_overriderockperm: 465 popt->overriderockperm = 1; 466 break; 467 case Opt_block: 468 if (match_int(&args[0], &option)) 469 return 0; 470 n = option; 471 if (n != 512 && n != 1024 && n != 2048) 472 return 0; 473 popt->blocksize = n; 474 break; 475 case Opt_nocompress: 476 popt->nocompress = 1; 477 break; 478 default: 479 return 0; 480 } 481 } 482 return 1; 483 } 484 485 /* 486 * Display the mount options in /proc/mounts. 487 */ 488 static int isofs_show_options(struct seq_file *m, struct dentry *root) 489 { 490 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 491 492 if (!sbi->s_rock) seq_puts(m, ",norock"); 493 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 494 if (sbi->s_cruft) seq_puts(m, ",cruft"); 495 if (sbi->s_hide) seq_puts(m, ",hide"); 496 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 497 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 498 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 499 if (sbi->s_utf8) seq_puts(m, ",utf8"); 500 501 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 502 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 503 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 504 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 505 506 if (root->d_sb->s_blocksize != 1024) 507 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 508 509 if (sbi->s_uid_set) 510 seq_printf(m, ",uid=%u", 511 from_kuid_munged(&init_user_ns, sbi->s_uid)); 512 if (sbi->s_gid_set) 513 seq_printf(m, ",gid=%u", 514 from_kgid_munged(&init_user_ns, sbi->s_gid)); 515 516 if (sbi->s_dmode != ISOFS_INVALID_MODE) 517 seq_printf(m, ",dmode=%o", sbi->s_dmode); 518 if (sbi->s_fmode != ISOFS_INVALID_MODE) 519 seq_printf(m, ",fmode=%o", sbi->s_fmode); 520 521 #ifdef CONFIG_JOLIET 522 if (sbi->s_nls_iocharset && 523 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) 524 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 525 #endif 526 return 0; 527 } 528 529 /* 530 * look if the driver can tell the multi session redirection value 531 * 532 * don't change this if you don't know what you do, please! 533 * Multisession is legal only with XA disks. 534 * A non-XA disk with more than one volume descriptor may do it right, but 535 * usually is written in a nowhere standardized "multi-partition" manner. 536 * Multisession uses absolute addressing (solely the first frame of the whole 537 * track is #0), multi-partition uses relative addressing (each first frame of 538 * each track is #0), and a track is not a session. 539 * 540 * A broken CDwriter software or drive firmware does not set new standards, 541 * at least not if conflicting with the existing ones. 542 * 543 * emoenke@gwdg.de 544 */ 545 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 546 547 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 548 { 549 struct cdrom_multisession ms_info; 550 unsigned int vol_desc_start; 551 struct block_device *bdev = sb->s_bdev; 552 int i; 553 554 vol_desc_start=0; 555 ms_info.addr_format=CDROM_LBA; 556 if (session > 0) { 557 struct cdrom_tocentry Te; 558 Te.cdte_track=session; 559 Te.cdte_format=CDROM_LBA; 560 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); 561 if (!i) { 562 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 563 session, Te.cdte_addr.lba, 564 Te.cdte_ctrl&CDROM_DATA_TRACK); 565 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) 566 return Te.cdte_addr.lba; 567 } 568 569 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 570 } 571 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); 572 if (session > 0) 573 printk(KERN_ERR "ISOFS: Invalid session number\n"); 574 #if 0 575 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); 576 if (i==0) { 577 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); 578 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); 579 } 580 #endif 581 if (i==0) 582 #if WE_OBEY_THE_WRITTEN_STANDARDS 583 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ 584 #endif 585 vol_desc_start=ms_info.addr.lba; 586 return vol_desc_start; 587 } 588 589 /* 590 * Check if root directory is empty (has less than 3 files). 591 * 592 * Used to detect broken CDs where ISO root directory is empty but Joliet root 593 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 594 * (and Joliet used instead) or else no files would be visible. 595 */ 596 static bool rootdir_empty(struct super_block *sb, unsigned long block) 597 { 598 int offset = 0, files = 0, de_len; 599 struct iso_directory_record *de; 600 struct buffer_head *bh; 601 602 bh = sb_bread(sb, block); 603 if (!bh) 604 return true; 605 while (files < 3) { 606 de = (struct iso_directory_record *) (bh->b_data + offset); 607 de_len = *(unsigned char *) de; 608 if (de_len == 0) 609 break; 610 files++; 611 offset += de_len; 612 } 613 brelse(bh); 614 return files < 3; 615 } 616 617 /* 618 * Initialize the superblock and read the root inode. 619 * 620 * Note: a check_disk_change() has been done immediately prior 621 * to this call, so we don't need to check again. 622 */ 623 static int isofs_fill_super(struct super_block *s, void *data, int silent) 624 { 625 struct buffer_head *bh = NULL, *pri_bh = NULL; 626 struct hs_primary_descriptor *h_pri = NULL; 627 struct iso_primary_descriptor *pri = NULL; 628 struct iso_supplementary_descriptor *sec = NULL; 629 struct iso_directory_record *rootp; 630 struct inode *inode; 631 struct iso9660_options opt; 632 struct isofs_sb_info *sbi; 633 unsigned long first_data_zone; 634 int joliet_level = 0; 635 int iso_blknum, block; 636 int orig_zonesize; 637 int table, error = -EINVAL; 638 unsigned int vol_desc_start; 639 640 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 641 if (!sbi) 642 return -ENOMEM; 643 s->s_fs_info = sbi; 644 645 if (!parse_options((char *)data, &opt)) 646 goto out_freesbi; 647 648 /* 649 * First of all, get the hardware blocksize for this device. 650 * If we don't know what it is, or the hardware blocksize is 651 * larger than the blocksize the user specified, then use 652 * that value. 653 */ 654 /* 655 * What if bugger tells us to go beyond page size? 656 */ 657 if (bdev_logical_block_size(s->s_bdev) > 2048) { 658 printk(KERN_WARNING 659 "ISOFS: unsupported/invalid hardware sector size %d\n", 660 bdev_logical_block_size(s->s_bdev)); 661 goto out_freesbi; 662 } 663 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 664 665 sbi->s_high_sierra = 0; /* default is iso9660 */ 666 sbi->s_session = opt.session; 667 sbi->s_sbsector = opt.sbsector; 668 669 vol_desc_start = (opt.sbsector != -1) ? 670 opt.sbsector : isofs_get_last_session(s,opt.session); 671 672 for (iso_blknum = vol_desc_start+16; 673 iso_blknum < vol_desc_start+100; iso_blknum++) { 674 struct hs_volume_descriptor *hdp; 675 struct iso_volume_descriptor *vdp; 676 677 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 678 if (!(bh = sb_bread(s, block))) 679 goto out_no_read; 680 681 vdp = (struct iso_volume_descriptor *)bh->b_data; 682 hdp = (struct hs_volume_descriptor *)bh->b_data; 683 684 /* 685 * Due to the overlapping physical location of the descriptors, 686 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 687 * proper identification in this case, we first check for ISO. 688 */ 689 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 690 if (isonum_711(vdp->type) == ISO_VD_END) 691 break; 692 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 693 if (!pri) { 694 pri = (struct iso_primary_descriptor *)vdp; 695 /* Save the buffer in case we need it ... */ 696 pri_bh = bh; 697 bh = NULL; 698 } 699 } 700 #ifdef CONFIG_JOLIET 701 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 702 sec = (struct iso_supplementary_descriptor *)vdp; 703 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 704 if (opt.joliet) { 705 if (sec->escape[2] == 0x40) 706 joliet_level = 1; 707 else if (sec->escape[2] == 0x43) 708 joliet_level = 2; 709 else if (sec->escape[2] == 0x45) 710 joliet_level = 3; 711 712 printk(KERN_DEBUG "ISO 9660 Extensions: " 713 "Microsoft Joliet Level %d\n", 714 joliet_level); 715 } 716 goto root_found; 717 } else { 718 /* Unknown supplementary volume descriptor */ 719 sec = NULL; 720 } 721 } 722 #endif 723 } else { 724 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 725 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 726 goto out_freebh; 727 728 sbi->s_high_sierra = 1; 729 opt.rock = 0; 730 h_pri = (struct hs_primary_descriptor *)vdp; 731 goto root_found; 732 } 733 } 734 735 /* Just skip any volume descriptors we don't recognize */ 736 737 brelse(bh); 738 bh = NULL; 739 } 740 /* 741 * If we fall through, either no volume descriptor was found, 742 * or else we passed a primary descriptor looking for others. 743 */ 744 if (!pri) 745 goto out_unknown_format; 746 brelse(bh); 747 bh = pri_bh; 748 pri_bh = NULL; 749 750 root_found: 751 /* We don't support read-write mounts */ 752 if (!sb_rdonly(s)) { 753 error = -EACCES; 754 goto out_freebh; 755 } 756 757 if (joliet_level && (!pri || !opt.rock)) { 758 /* This is the case of Joliet with the norock mount flag. 759 * A disc with both Joliet and Rock Ridge is handled later 760 */ 761 pri = (struct iso_primary_descriptor *) sec; 762 } 763 764 if(sbi->s_high_sierra){ 765 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 766 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 767 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 768 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 769 } else { 770 if (!pri) 771 goto out_freebh; 772 rootp = (struct iso_directory_record *) pri->root_directory_record; 773 sbi->s_nzones = isonum_733(pri->volume_space_size); 774 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 775 sbi->s_max_size = isonum_733(pri->volume_space_size); 776 } 777 778 sbi->s_ninodes = 0; /* No way to figure this out easily */ 779 780 orig_zonesize = sbi->s_log_zone_size; 781 /* 782 * If the zone size is smaller than the hardware sector size, 783 * this is a fatal error. This would occur if the disc drive 784 * had sectors that were 2048 bytes, but the filesystem had 785 * blocks that were 512 bytes (which should only very rarely 786 * happen.) 787 */ 788 if (orig_zonesize < opt.blocksize) 789 goto out_bad_size; 790 791 /* RDE: convert log zone size to bit shift */ 792 switch (sbi->s_log_zone_size) { 793 case 512: sbi->s_log_zone_size = 9; break; 794 case 1024: sbi->s_log_zone_size = 10; break; 795 case 2048: sbi->s_log_zone_size = 11; break; 796 797 default: 798 goto out_bad_zone_size; 799 } 800 801 s->s_magic = ISOFS_SUPER_MAGIC; 802 803 /* 804 * With multi-extent files, file size is only limited by the maximum 805 * size of a file system, which is 8 TB. 806 */ 807 s->s_maxbytes = 0x80000000000LL; 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 int isofs_readpages(struct file *file, struct address_space *mapping, 1187 struct list_head *pages, unsigned nr_pages) 1188 { 1189 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); 1190 } 1191 1192 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1193 { 1194 return generic_block_bmap(mapping,block,isofs_get_block); 1195 } 1196 1197 static const struct address_space_operations isofs_aops = { 1198 .readpage = isofs_readpage, 1199 .readpages = isofs_readpages, 1200 .bmap = _isofs_bmap 1201 }; 1202 1203 static int isofs_read_level3_size(struct inode *inode) 1204 { 1205 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1206 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1207 struct buffer_head *bh = NULL; 1208 unsigned long block, offset, block_saved, offset_saved; 1209 int i = 0; 1210 int more_entries = 0; 1211 struct iso_directory_record *tmpde = NULL; 1212 struct iso_inode_info *ei = ISOFS_I(inode); 1213 1214 inode->i_size = 0; 1215 1216 /* The first 16 blocks are reserved as the System Area. Thus, 1217 * no inodes can appear in block 0. We use this to flag that 1218 * this is the last section. */ 1219 ei->i_next_section_block = 0; 1220 ei->i_next_section_offset = 0; 1221 1222 block = ei->i_iget5_block; 1223 offset = ei->i_iget5_offset; 1224 1225 do { 1226 struct iso_directory_record *de; 1227 unsigned int de_len; 1228 1229 if (!bh) { 1230 bh = sb_bread(inode->i_sb, block); 1231 if (!bh) 1232 goto out_noread; 1233 } 1234 de = (struct iso_directory_record *) (bh->b_data + offset); 1235 de_len = *(unsigned char *) de; 1236 1237 if (de_len == 0) { 1238 brelse(bh); 1239 bh = NULL; 1240 ++block; 1241 offset = 0; 1242 continue; 1243 } 1244 1245 block_saved = block; 1246 offset_saved = offset; 1247 offset += de_len; 1248 1249 /* Make sure we have a full directory entry */ 1250 if (offset >= bufsize) { 1251 int slop = bufsize - offset + de_len; 1252 if (!tmpde) { 1253 tmpde = kmalloc(256, GFP_KERNEL); 1254 if (!tmpde) 1255 goto out_nomem; 1256 } 1257 memcpy(tmpde, de, slop); 1258 offset &= bufsize - 1; 1259 block++; 1260 brelse(bh); 1261 bh = NULL; 1262 if (offset) { 1263 bh = sb_bread(inode->i_sb, block); 1264 if (!bh) 1265 goto out_noread; 1266 memcpy((void *)tmpde+slop, bh->b_data, offset); 1267 } 1268 de = tmpde; 1269 } 1270 1271 inode->i_size += isonum_733(de->size); 1272 if (i == 1) { 1273 ei->i_next_section_block = block_saved; 1274 ei->i_next_section_offset = offset_saved; 1275 } 1276 1277 more_entries = de->flags[-high_sierra] & 0x80; 1278 1279 i++; 1280 if (i > 100) 1281 goto out_toomany; 1282 } while (more_entries); 1283 out: 1284 kfree(tmpde); 1285 if (bh) 1286 brelse(bh); 1287 return 0; 1288 1289 out_nomem: 1290 if (bh) 1291 brelse(bh); 1292 return -ENOMEM; 1293 1294 out_noread: 1295 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1296 kfree(tmpde); 1297 return -EIO; 1298 1299 out_toomany: 1300 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1301 "isofs_read_level3_size: inode=%lu\n", 1302 __func__, inode->i_ino); 1303 goto out; 1304 } 1305 1306 static int isofs_read_inode(struct inode *inode, int relocated) 1307 { 1308 struct super_block *sb = inode->i_sb; 1309 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1310 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1311 unsigned long block; 1312 int high_sierra = sbi->s_high_sierra; 1313 struct buffer_head *bh; 1314 struct iso_directory_record *de; 1315 struct iso_directory_record *tmpde = NULL; 1316 unsigned int de_len; 1317 unsigned long offset; 1318 struct iso_inode_info *ei = ISOFS_I(inode); 1319 int ret = -EIO; 1320 1321 block = ei->i_iget5_block; 1322 bh = sb_bread(inode->i_sb, block); 1323 if (!bh) 1324 goto out_badread; 1325 1326 offset = ei->i_iget5_offset; 1327 1328 de = (struct iso_directory_record *) (bh->b_data + offset); 1329 de_len = *(unsigned char *) de; 1330 1331 if (offset + de_len > bufsize) { 1332 int frag1 = bufsize - offset; 1333 1334 tmpde = kmalloc(de_len, GFP_KERNEL); 1335 if (!tmpde) { 1336 ret = -ENOMEM; 1337 goto fail; 1338 } 1339 memcpy(tmpde, bh->b_data + offset, frag1); 1340 brelse(bh); 1341 bh = sb_bread(inode->i_sb, ++block); 1342 if (!bh) 1343 goto out_badread; 1344 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1345 de = tmpde; 1346 } 1347 1348 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1349 ei->i_iget5_offset, 1350 ISOFS_BUFFER_BITS(inode)); 1351 1352 /* Assume it is a normal-format file unless told otherwise */ 1353 ei->i_file_format = isofs_file_normal; 1354 1355 if (de->flags[-high_sierra] & 2) { 1356 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1357 inode->i_mode = S_IFDIR | sbi->s_dmode; 1358 else 1359 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1360 set_nlink(inode, 1); /* 1361 * Set to 1. We know there are 2, but 1362 * the find utility tries to optimize 1363 * if it is 2, and it screws up. It is 1364 * easier to give 1 which tells find to 1365 * do it the hard way. 1366 */ 1367 } else { 1368 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1369 inode->i_mode = S_IFREG | sbi->s_fmode; 1370 } else { 1371 /* 1372 * Set default permissions: r-x for all. The disc 1373 * could be shared with DOS machines so virtually 1374 * anything could be a valid executable. 1375 */ 1376 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1377 } 1378 set_nlink(inode, 1); 1379 } 1380 inode->i_uid = sbi->s_uid; 1381 inode->i_gid = sbi->s_gid; 1382 inode->i_blocks = 0; 1383 1384 ei->i_format_parm[0] = 0; 1385 ei->i_format_parm[1] = 0; 1386 ei->i_format_parm[2] = 0; 1387 1388 ei->i_section_size = isonum_733(de->size); 1389 if (de->flags[-high_sierra] & 0x80) { 1390 ret = isofs_read_level3_size(inode); 1391 if (ret < 0) 1392 goto fail; 1393 ret = -EIO; 1394 } else { 1395 ei->i_next_section_block = 0; 1396 ei->i_next_section_offset = 0; 1397 inode->i_size = isonum_733(de->size); 1398 } 1399 1400 /* 1401 * Some dipshit decided to store some other bit of information 1402 * in the high byte of the file length. Truncate size in case 1403 * this CDROM was mounted with the cruft option. 1404 */ 1405 1406 if (sbi->s_cruft) 1407 inode->i_size &= 0x00ffffff; 1408 1409 if (de->interleave[0]) { 1410 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1411 inode->i_size = 0; 1412 } 1413 1414 /* I have no idea what file_unit_size is used for, so 1415 we will flag it for now */ 1416 if (de->file_unit_size[0] != 0) { 1417 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1418 inode->i_ino); 1419 } 1420 1421 /* I have no idea what other flag bits are used for, so 1422 we will flag it for now */ 1423 #ifdef DEBUG 1424 if((de->flags[-high_sierra] & ~2)!= 0){ 1425 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1426 "(%ld %x).\n", 1427 inode->i_ino, de->flags[-high_sierra]); 1428 } 1429 #endif 1430 1431 inode->i_mtime.tv_sec = 1432 inode->i_atime.tv_sec = 1433 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1434 inode->i_mtime.tv_nsec = 1435 inode->i_atime.tv_nsec = 1436 inode->i_ctime.tv_nsec = 0; 1437 1438 ei->i_first_extent = (isonum_733(de->extent) + 1439 isonum_711(de->ext_attr_length)); 1440 1441 /* Set the number of blocks for stat() - should be done before RR */ 1442 inode->i_blocks = (inode->i_size + 511) >> 9; 1443 1444 /* 1445 * Now test for possible Rock Ridge extensions which will override 1446 * some of these numbers in the inode structure. 1447 */ 1448 1449 if (!high_sierra) { 1450 parse_rock_ridge_inode(de, inode, relocated); 1451 /* if we want uid/gid set, override the rock ridge setting */ 1452 if (sbi->s_uid_set) 1453 inode->i_uid = sbi->s_uid; 1454 if (sbi->s_gid_set) 1455 inode->i_gid = sbi->s_gid; 1456 } 1457 /* Now set final access rights if overriding rock ridge setting */ 1458 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1459 sbi->s_dmode != ISOFS_INVALID_MODE) 1460 inode->i_mode = S_IFDIR | sbi->s_dmode; 1461 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1462 sbi->s_fmode != ISOFS_INVALID_MODE) 1463 inode->i_mode = S_IFREG | sbi->s_fmode; 1464 1465 /* Install the inode operations vector */ 1466 if (S_ISREG(inode->i_mode)) { 1467 inode->i_fop = &generic_ro_fops; 1468 switch (ei->i_file_format) { 1469 #ifdef CONFIG_ZISOFS 1470 case isofs_file_compressed: 1471 inode->i_data.a_ops = &zisofs_aops; 1472 break; 1473 #endif 1474 default: 1475 inode->i_data.a_ops = &isofs_aops; 1476 break; 1477 } 1478 } else if (S_ISDIR(inode->i_mode)) { 1479 inode->i_op = &isofs_dir_inode_operations; 1480 inode->i_fop = &isofs_dir_operations; 1481 } else if (S_ISLNK(inode->i_mode)) { 1482 inode->i_op = &page_symlink_inode_operations; 1483 inode_nohighmem(inode); 1484 inode->i_data.a_ops = &isofs_symlink_aops; 1485 } else 1486 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1487 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1488 1489 ret = 0; 1490 out: 1491 kfree(tmpde); 1492 if (bh) 1493 brelse(bh); 1494 return ret; 1495 1496 out_badread: 1497 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1498 fail: 1499 goto out; 1500 } 1501 1502 struct isofs_iget5_callback_data { 1503 unsigned long block; 1504 unsigned long offset; 1505 }; 1506 1507 static int isofs_iget5_test(struct inode *ino, void *data) 1508 { 1509 struct iso_inode_info *i = ISOFS_I(ino); 1510 struct isofs_iget5_callback_data *d = 1511 (struct isofs_iget5_callback_data*)data; 1512 return (i->i_iget5_block == d->block) 1513 && (i->i_iget5_offset == d->offset); 1514 } 1515 1516 static int isofs_iget5_set(struct inode *ino, void *data) 1517 { 1518 struct iso_inode_info *i = ISOFS_I(ino); 1519 struct isofs_iget5_callback_data *d = 1520 (struct isofs_iget5_callback_data*)data; 1521 i->i_iget5_block = d->block; 1522 i->i_iget5_offset = d->offset; 1523 return 0; 1524 } 1525 1526 /* Store, in the inode's containing structure, the block and block 1527 * offset that point to the underlying meta-data for the inode. The 1528 * code below is otherwise similar to the iget() code in 1529 * include/linux/fs.h */ 1530 struct inode *__isofs_iget(struct super_block *sb, 1531 unsigned long block, 1532 unsigned long offset, 1533 int relocated) 1534 { 1535 unsigned long hashval; 1536 struct inode *inode; 1537 struct isofs_iget5_callback_data data; 1538 long ret; 1539 1540 if (offset >= 1ul << sb->s_blocksize_bits) 1541 return ERR_PTR(-EINVAL); 1542 1543 data.block = block; 1544 data.offset = offset; 1545 1546 hashval = (block << sb->s_blocksize_bits) | offset; 1547 1548 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1549 &isofs_iget5_set, &data); 1550 1551 if (!inode) 1552 return ERR_PTR(-ENOMEM); 1553 1554 if (inode->i_state & I_NEW) { 1555 ret = isofs_read_inode(inode, relocated); 1556 if (ret < 0) { 1557 iget_failed(inode); 1558 inode = ERR_PTR(ret); 1559 } else { 1560 unlock_new_inode(inode); 1561 } 1562 } 1563 1564 return inode; 1565 } 1566 1567 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1568 int flags, const char *dev_name, void *data) 1569 { 1570 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1571 } 1572 1573 static struct file_system_type iso9660_fs_type = { 1574 .owner = THIS_MODULE, 1575 .name = "iso9660", 1576 .mount = isofs_mount, 1577 .kill_sb = kill_block_super, 1578 .fs_flags = FS_REQUIRES_DEV, 1579 }; 1580 MODULE_ALIAS_FS("iso9660"); 1581 MODULE_ALIAS("iso9660"); 1582 1583 static int __init init_iso9660_fs(void) 1584 { 1585 int err = init_inodecache(); 1586 if (err) 1587 goto out; 1588 #ifdef CONFIG_ZISOFS 1589 err = zisofs_init(); 1590 if (err) 1591 goto out1; 1592 #endif 1593 err = register_filesystem(&iso9660_fs_type); 1594 if (err) 1595 goto out2; 1596 return 0; 1597 out2: 1598 #ifdef CONFIG_ZISOFS 1599 zisofs_cleanup(); 1600 out1: 1601 #endif 1602 destroy_inodecache(); 1603 out: 1604 return err; 1605 } 1606 1607 static void __exit exit_iso9660_fs(void) 1608 { 1609 unregister_filesystem(&iso9660_fs_type); 1610 #ifdef CONFIG_ZISOFS 1611 zisofs_cleanup(); 1612 #endif 1613 destroy_inodecache(); 1614 } 1615 1616 module_init(init_iso9660_fs) 1617 module_exit(exit_iso9660_fs) 1618 MODULE_LICENSE("GPL"); 1619