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 28 #include "isofs.h" 29 #include "zisofs.h" 30 31 #define BEQUIET 32 33 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); 34 static int isofs_dentry_cmpi(const struct dentry *dentry, 35 unsigned int len, const char *str, const struct qstr *name); 36 37 #ifdef CONFIG_JOLIET 38 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); 39 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); 40 static int isofs_dentry_cmpi_ms(const struct dentry *dentry, 41 unsigned int len, const char *str, const struct qstr *name); 42 static int isofs_dentry_cmp_ms(const struct dentry *dentry, 43 unsigned int len, const char *str, const struct qstr *name); 44 #endif 45 46 static void isofs_put_super(struct super_block *sb) 47 { 48 struct isofs_sb_info *sbi = ISOFS_SB(sb); 49 50 #ifdef CONFIG_JOLIET 51 unload_nls(sbi->s_nls_iocharset); 52 #endif 53 54 kfree(sbi); 55 sb->s_fs_info = NULL; 56 return; 57 } 58 59 static int isofs_read_inode(struct inode *, int relocated); 60 static int isofs_statfs (struct dentry *, struct kstatfs *); 61 static int isofs_show_options(struct seq_file *, struct dentry *); 62 63 static struct kmem_cache *isofs_inode_cachep; 64 65 static struct inode *isofs_alloc_inode(struct super_block *sb) 66 { 67 struct iso_inode_info *ei; 68 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); 69 if (!ei) 70 return NULL; 71 return &ei->vfs_inode; 72 } 73 74 static void isofs_i_callback(struct rcu_head *head) 75 { 76 struct inode *inode = container_of(head, struct inode, i_rcu); 77 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 78 } 79 80 static void isofs_destroy_inode(struct inode *inode) 81 { 82 call_rcu(&inode->i_rcu, isofs_i_callback); 83 } 84 85 static void init_once(void *foo) 86 { 87 struct iso_inode_info *ei = foo; 88 89 inode_init_once(&ei->vfs_inode); 90 } 91 92 static int __init init_inodecache(void) 93 { 94 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", 95 sizeof(struct iso_inode_info), 96 0, (SLAB_RECLAIM_ACCOUNT| 97 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 98 init_once); 99 if (!isofs_inode_cachep) 100 return -ENOMEM; 101 return 0; 102 } 103 104 static void destroy_inodecache(void) 105 { 106 /* 107 * Make sure all delayed rcu free inodes are flushed before we 108 * destroy cache. 109 */ 110 rcu_barrier(); 111 kmem_cache_destroy(isofs_inode_cachep); 112 } 113 114 static int isofs_remount(struct super_block *sb, int *flags, char *data) 115 { 116 sync_filesystem(sb); 117 if (!(*flags & MS_RDONLY)) 118 return -EROFS; 119 return 0; 120 } 121 122 static const struct super_operations isofs_sops = { 123 .alloc_inode = isofs_alloc_inode, 124 .destroy_inode = isofs_destroy_inode, 125 .put_super = isofs_put_super, 126 .statfs = isofs_statfs, 127 .remount_fs = isofs_remount, 128 .show_options = isofs_show_options, 129 }; 130 131 132 static const struct dentry_operations isofs_dentry_ops[] = { 133 { 134 .d_hash = isofs_hashi, 135 .d_compare = isofs_dentry_cmpi, 136 }, 137 #ifdef CONFIG_JOLIET 138 { 139 .d_hash = isofs_hash_ms, 140 .d_compare = isofs_dentry_cmp_ms, 141 }, 142 { 143 .d_hash = isofs_hashi_ms, 144 .d_compare = isofs_dentry_cmpi_ms, 145 }, 146 #endif 147 }; 148 149 struct iso9660_options{ 150 unsigned int rock:1; 151 unsigned int joliet:1; 152 unsigned int cruft:1; 153 unsigned int hide:1; 154 unsigned int showassoc:1; 155 unsigned int nocompress:1; 156 unsigned int overriderockperm:1; 157 unsigned int uid_set:1; 158 unsigned int gid_set:1; 159 unsigned int utf8:1; 160 unsigned char map; 161 unsigned char check; 162 unsigned int blocksize; 163 umode_t fmode; 164 umode_t dmode; 165 kgid_t gid; 166 kuid_t uid; 167 char *iocharset; 168 /* LVE */ 169 s32 session; 170 s32 sbsector; 171 }; 172 173 /* 174 * Compute the hash for the isofs name corresponding to the dentry. 175 */ 176 static int 177 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) 178 { 179 const char *name; 180 int len; 181 char c; 182 unsigned long hash; 183 184 len = qstr->len; 185 name = qstr->name; 186 if (ms) { 187 while (len && name[len-1] == '.') 188 len--; 189 } 190 191 hash = init_name_hash(dentry); 192 while (len--) { 193 c = tolower(*name++); 194 hash = partial_name_hash(c, hash); 195 } 196 qstr->hash = end_name_hash(hash); 197 198 return 0; 199 } 200 201 /* 202 * Compare of two isofs names. 203 */ 204 static int isofs_dentry_cmp_common( 205 unsigned int len, const char *str, 206 const struct qstr *name, int ms, int ci) 207 { 208 int alen, blen; 209 210 /* A filename cannot end in '.' or we treat it like it has none */ 211 alen = name->len; 212 blen = len; 213 if (ms) { 214 while (alen && name->name[alen-1] == '.') 215 alen--; 216 while (blen && str[blen-1] == '.') 217 blen--; 218 } 219 if (alen == blen) { 220 if (ci) { 221 if (strncasecmp(name->name, str, alen) == 0) 222 return 0; 223 } else { 224 if (strncmp(name->name, str, alen) == 0) 225 return 0; 226 } 227 } 228 return 1; 229 } 230 231 static int 232 isofs_hashi(const struct dentry *dentry, struct qstr *qstr) 233 { 234 return isofs_hashi_common(dentry, qstr, 0); 235 } 236 237 static int 238 isofs_dentry_cmpi(const struct dentry *dentry, 239 unsigned int len, const char *str, const struct qstr *name) 240 { 241 return isofs_dentry_cmp_common(len, str, name, 0, 1); 242 } 243 244 #ifdef CONFIG_JOLIET 245 /* 246 * Compute the hash for the isofs name corresponding to the dentry. 247 */ 248 static int 249 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) 250 { 251 const char *name; 252 int len; 253 254 len = qstr->len; 255 name = qstr->name; 256 if (ms) { 257 while (len && name[len-1] == '.') 258 len--; 259 } 260 261 qstr->hash = full_name_hash(dentry, name, len); 262 263 return 0; 264 } 265 266 static int 267 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) 268 { 269 return isofs_hash_common(dentry, qstr, 1); 270 } 271 272 static int 273 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) 274 { 275 return isofs_hashi_common(dentry, qstr, 1); 276 } 277 278 static int 279 isofs_dentry_cmp_ms(const struct dentry *dentry, 280 unsigned int len, const char *str, const struct qstr *name) 281 { 282 return isofs_dentry_cmp_common(len, str, name, 1, 0); 283 } 284 285 static int 286 isofs_dentry_cmpi_ms(const struct dentry *dentry, 287 unsigned int len, const char *str, const struct qstr *name) 288 { 289 return isofs_dentry_cmp_common(len, str, name, 1, 1); 290 } 291 #endif 292 293 enum { 294 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, 295 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, 296 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, 297 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, 298 }; 299 300 static const match_table_t tokens = { 301 {Opt_norock, "norock"}, 302 {Opt_nojoliet, "nojoliet"}, 303 {Opt_unhide, "unhide"}, 304 {Opt_hide, "hide"}, 305 {Opt_showassoc, "showassoc"}, 306 {Opt_cruft, "cruft"}, 307 {Opt_utf8, "utf8"}, 308 {Opt_iocharset, "iocharset=%s"}, 309 {Opt_map_a, "map=acorn"}, 310 {Opt_map_a, "map=a"}, 311 {Opt_map_n, "map=normal"}, 312 {Opt_map_n, "map=n"}, 313 {Opt_map_o, "map=off"}, 314 {Opt_map_o, "map=o"}, 315 {Opt_session, "session=%u"}, 316 {Opt_sb, "sbsector=%u"}, 317 {Opt_check_r, "check=relaxed"}, 318 {Opt_check_r, "check=r"}, 319 {Opt_check_s, "check=strict"}, 320 {Opt_check_s, "check=s"}, 321 {Opt_uid, "uid=%u"}, 322 {Opt_gid, "gid=%u"}, 323 {Opt_mode, "mode=%u"}, 324 {Opt_dmode, "dmode=%u"}, 325 {Opt_overriderockperm, "overriderockperm"}, 326 {Opt_block, "block=%u"}, 327 {Opt_ignore, "conv=binary"}, 328 {Opt_ignore, "conv=b"}, 329 {Opt_ignore, "conv=text"}, 330 {Opt_ignore, "conv=t"}, 331 {Opt_ignore, "conv=mtext"}, 332 {Opt_ignore, "conv=m"}, 333 {Opt_ignore, "conv=auto"}, 334 {Opt_ignore, "conv=a"}, 335 {Opt_nocompress, "nocompress"}, 336 {Opt_err, NULL} 337 }; 338 339 static int parse_options(char *options, struct iso9660_options *popt) 340 { 341 char *p; 342 int option; 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 popt->iocharset = match_strdup(&args[0]); 398 break; 399 #endif 400 case Opt_map_a: 401 popt->map = 'a'; 402 break; 403 case Opt_map_o: 404 popt->map = 'o'; 405 break; 406 case Opt_map_n: 407 popt->map = 'n'; 408 break; 409 case Opt_session: 410 if (match_int(&args[0], &option)) 411 return 0; 412 n = option; 413 /* 414 * Track numbers are supposed to be in range 1-99, the 415 * mount option starts indexing at 0. 416 */ 417 if (n >= 99) 418 return 0; 419 popt->session = n + 1; 420 break; 421 case Opt_sb: 422 if (match_int(&args[0], &option)) 423 return 0; 424 popt->sbsector = option; 425 break; 426 case Opt_check_r: 427 popt->check = 'r'; 428 break; 429 case Opt_check_s: 430 popt->check = 's'; 431 break; 432 case Opt_ignore: 433 break; 434 case Opt_uid: 435 if (match_int(&args[0], &option)) 436 return 0; 437 popt->uid = make_kuid(current_user_ns(), option); 438 if (!uid_valid(popt->uid)) 439 return 0; 440 popt->uid_set = 1; 441 break; 442 case Opt_gid: 443 if (match_int(&args[0], &option)) 444 return 0; 445 popt->gid = make_kgid(current_user_ns(), option); 446 if (!gid_valid(popt->gid)) 447 return 0; 448 popt->gid_set = 1; 449 break; 450 case Opt_mode: 451 if (match_int(&args[0], &option)) 452 return 0; 453 popt->fmode = option; 454 break; 455 case Opt_dmode: 456 if (match_int(&args[0], &option)) 457 return 0; 458 popt->dmode = option; 459 break; 460 case Opt_overriderockperm: 461 popt->overriderockperm = 1; 462 break; 463 case Opt_block: 464 if (match_int(&args[0], &option)) 465 return 0; 466 n = option; 467 if (n != 512 && n != 1024 && n != 2048) 468 return 0; 469 popt->blocksize = n; 470 break; 471 case Opt_nocompress: 472 popt->nocompress = 1; 473 break; 474 default: 475 return 0; 476 } 477 } 478 return 1; 479 } 480 481 /* 482 * Display the mount options in /proc/mounts. 483 */ 484 static int isofs_show_options(struct seq_file *m, struct dentry *root) 485 { 486 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 487 488 if (!sbi->s_rock) seq_puts(m, ",norock"); 489 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 490 if (sbi->s_cruft) seq_puts(m, ",cruft"); 491 if (sbi->s_hide) seq_puts(m, ",hide"); 492 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 493 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 494 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 495 if (sbi->s_utf8) seq_puts(m, ",utf8"); 496 497 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 498 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 499 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 500 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 501 502 if (root->d_sb->s_blocksize != 1024) 503 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 504 505 if (sbi->s_uid_set) 506 seq_printf(m, ",uid=%u", 507 from_kuid_munged(&init_user_ns, sbi->s_uid)); 508 if (sbi->s_gid_set) 509 seq_printf(m, ",gid=%u", 510 from_kgid_munged(&init_user_ns, sbi->s_gid)); 511 512 if (sbi->s_dmode != ISOFS_INVALID_MODE) 513 seq_printf(m, ",dmode=%o", sbi->s_dmode); 514 if (sbi->s_fmode != ISOFS_INVALID_MODE) 515 seq_printf(m, ",fmode=%o", sbi->s_fmode); 516 517 if (sbi->s_nls_iocharset && 518 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) 519 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 520 return 0; 521 } 522 523 /* 524 * look if the driver can tell the multi session redirection value 525 * 526 * don't change this if you don't know what you do, please! 527 * Multisession is legal only with XA disks. 528 * A non-XA disk with more than one volume descriptor may do it right, but 529 * usually is written in a nowhere standardized "multi-partition" manner. 530 * Multisession uses absolute addressing (solely the first frame of the whole 531 * track is #0), multi-partition uses relative addressing (each first frame of 532 * each track is #0), and a track is not a session. 533 * 534 * A broken CDwriter software or drive firmware does not set new standards, 535 * at least not if conflicting with the existing ones. 536 * 537 * emoenke@gwdg.de 538 */ 539 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 540 541 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 542 { 543 struct cdrom_multisession ms_info; 544 unsigned int vol_desc_start; 545 struct block_device *bdev = sb->s_bdev; 546 int i; 547 548 vol_desc_start=0; 549 ms_info.addr_format=CDROM_LBA; 550 if (session > 0) { 551 struct cdrom_tocentry Te; 552 Te.cdte_track=session; 553 Te.cdte_format=CDROM_LBA; 554 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); 555 if (!i) { 556 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 557 session, Te.cdte_addr.lba, 558 Te.cdte_ctrl&CDROM_DATA_TRACK); 559 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) 560 return Te.cdte_addr.lba; 561 } 562 563 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 564 } 565 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); 566 if (session > 0) 567 printk(KERN_ERR "ISOFS: Invalid session number\n"); 568 #if 0 569 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); 570 if (i==0) { 571 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); 572 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); 573 } 574 #endif 575 if (i==0) 576 #if WE_OBEY_THE_WRITTEN_STANDARDS 577 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ 578 #endif 579 vol_desc_start=ms_info.addr.lba; 580 return vol_desc_start; 581 } 582 583 /* 584 * Check if root directory is empty (has less than 3 files). 585 * 586 * Used to detect broken CDs where ISO root directory is empty but Joliet root 587 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 588 * (and Joliet used instead) or else no files would be visible. 589 */ 590 static bool rootdir_empty(struct super_block *sb, unsigned long block) 591 { 592 int offset = 0, files = 0, de_len; 593 struct iso_directory_record *de; 594 struct buffer_head *bh; 595 596 bh = sb_bread(sb, block); 597 if (!bh) 598 return true; 599 while (files < 3) { 600 de = (struct iso_directory_record *) (bh->b_data + offset); 601 de_len = *(unsigned char *) de; 602 if (de_len == 0) 603 break; 604 files++; 605 offset += de_len; 606 } 607 brelse(bh); 608 return files < 3; 609 } 610 611 /* 612 * Initialize the superblock and read the root inode. 613 * 614 * Note: a check_disk_change() has been done immediately prior 615 * to this call, so we don't need to check again. 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 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 652 653 sbi->s_high_sierra = 0; /* default is iso9660 */ 654 sbi->s_session = opt.session; 655 sbi->s_sbsector = opt.sbsector; 656 657 vol_desc_start = (opt.sbsector != -1) ? 658 opt.sbsector : isofs_get_last_session(s,opt.session); 659 660 for (iso_blknum = vol_desc_start+16; 661 iso_blknum < vol_desc_start+100; iso_blknum++) { 662 struct hs_volume_descriptor *hdp; 663 struct iso_volume_descriptor *vdp; 664 665 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 666 if (!(bh = sb_bread(s, block))) 667 goto out_no_read; 668 669 vdp = (struct iso_volume_descriptor *)bh->b_data; 670 hdp = (struct hs_volume_descriptor *)bh->b_data; 671 672 /* 673 * Due to the overlapping physical location of the descriptors, 674 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 675 * proper identification in this case, we first check for ISO. 676 */ 677 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 678 if (isonum_711(vdp->type) == ISO_VD_END) 679 break; 680 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 681 if (!pri) { 682 pri = (struct iso_primary_descriptor *)vdp; 683 /* Save the buffer in case we need it ... */ 684 pri_bh = bh; 685 bh = NULL; 686 } 687 } 688 #ifdef CONFIG_JOLIET 689 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 690 sec = (struct iso_supplementary_descriptor *)vdp; 691 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 692 if (opt.joliet) { 693 if (sec->escape[2] == 0x40) 694 joliet_level = 1; 695 else if (sec->escape[2] == 0x43) 696 joliet_level = 2; 697 else if (sec->escape[2] == 0x45) 698 joliet_level = 3; 699 700 printk(KERN_DEBUG "ISO 9660 Extensions: " 701 "Microsoft Joliet Level %d\n", 702 joliet_level); 703 } 704 goto root_found; 705 } else { 706 /* Unknown supplementary volume descriptor */ 707 sec = NULL; 708 } 709 } 710 #endif 711 } else { 712 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 713 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 714 goto out_freebh; 715 716 sbi->s_high_sierra = 1; 717 opt.rock = 0; 718 h_pri = (struct hs_primary_descriptor *)vdp; 719 goto root_found; 720 } 721 } 722 723 /* Just skip any volume descriptors we don't recognize */ 724 725 brelse(bh); 726 bh = NULL; 727 } 728 /* 729 * If we fall through, either no volume descriptor was found, 730 * or else we passed a primary descriptor looking for others. 731 */ 732 if (!pri) 733 goto out_unknown_format; 734 brelse(bh); 735 bh = pri_bh; 736 pri_bh = NULL; 737 738 root_found: 739 /* We don't support read-write mounts */ 740 if (!sb_rdonly(s)) { 741 error = -EACCES; 742 goto out_freebh; 743 } 744 745 if (joliet_level && (!pri || !opt.rock)) { 746 /* This is the case of Joliet with the norock mount flag. 747 * A disc with both Joliet and Rock Ridge is handled later 748 */ 749 pri = (struct iso_primary_descriptor *) sec; 750 } 751 752 if(sbi->s_high_sierra){ 753 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 754 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 755 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 756 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 757 } else { 758 if (!pri) 759 goto out_freebh; 760 rootp = (struct iso_directory_record *) pri->root_directory_record; 761 sbi->s_nzones = isonum_733(pri->volume_space_size); 762 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 763 sbi->s_max_size = isonum_733(pri->volume_space_size); 764 } 765 766 sbi->s_ninodes = 0; /* No way to figure this out easily */ 767 768 orig_zonesize = sbi->s_log_zone_size; 769 /* 770 * If the zone size is smaller than the hardware sector size, 771 * this is a fatal error. This would occur if the disc drive 772 * had sectors that were 2048 bytes, but the filesystem had 773 * blocks that were 512 bytes (which should only very rarely 774 * happen.) 775 */ 776 if (orig_zonesize < opt.blocksize) 777 goto out_bad_size; 778 779 /* RDE: convert log zone size to bit shift */ 780 switch (sbi->s_log_zone_size) { 781 case 512: sbi->s_log_zone_size = 9; break; 782 case 1024: sbi->s_log_zone_size = 10; break; 783 case 2048: sbi->s_log_zone_size = 11; break; 784 785 default: 786 goto out_bad_zone_size; 787 } 788 789 s->s_magic = ISOFS_SUPER_MAGIC; 790 791 /* 792 * With multi-extent files, file size is only limited by the maximum 793 * size of a file system, which is 8 TB. 794 */ 795 s->s_maxbytes = 0x80000000000LL; 796 797 /* Set this for reference. Its not currently used except on write 798 which we don't have .. */ 799 800 first_data_zone = isonum_733(rootp->extent) + 801 isonum_711(rootp->ext_attr_length); 802 sbi->s_firstdatazone = first_data_zone; 803 #ifndef BEQUIET 804 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 805 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 806 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 807 if(sbi->s_high_sierra) 808 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 809 #endif 810 811 /* 812 * If the Joliet level is set, we _may_ decide to use the 813 * secondary descriptor, but can't be sure until after we 814 * read the root inode. But before reading the root inode 815 * we may need to change the device blocksize, and would 816 * rather release the old buffer first. So, we cache the 817 * first_data_zone value from the secondary descriptor. 818 */ 819 if (joliet_level) { 820 pri = (struct iso_primary_descriptor *) sec; 821 rootp = (struct iso_directory_record *) 822 pri->root_directory_record; 823 first_data_zone = isonum_733(rootp->extent) + 824 isonum_711(rootp->ext_attr_length); 825 } 826 827 /* 828 * We're all done using the volume descriptor, and may need 829 * to change the device blocksize, so release the buffer now. 830 */ 831 brelse(pri_bh); 832 brelse(bh); 833 834 /* 835 * Force the blocksize to 512 for 512 byte sectors. The file 836 * read primitives really get it wrong in a bad way if we don't 837 * do this. 838 * 839 * Note - we should never be setting the blocksize to something 840 * less than the hardware sector size for the device. If we 841 * do, we would end up having to read larger buffers and split 842 * out portions to satisfy requests. 843 * 844 * Note2- the idea here is that we want to deal with the optimal 845 * zonesize in the filesystem. If we have it set to something less, 846 * then we have horrible problems with trying to piece together 847 * bits of adjacent blocks in order to properly read directory 848 * entries. By forcing the blocksize in this way, we ensure 849 * that we will never be required to do this. 850 */ 851 sb_set_blocksize(s, orig_zonesize); 852 853 sbi->s_nls_iocharset = NULL; 854 855 #ifdef CONFIG_JOLIET 856 if (joliet_level && opt.utf8 == 0) { 857 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 858 sbi->s_nls_iocharset = load_nls(p); 859 if (! sbi->s_nls_iocharset) { 860 /* Fail only if explicit charset specified */ 861 if (opt.iocharset) 862 goto out_freesbi; 863 sbi->s_nls_iocharset = load_nls_default(); 864 } 865 } 866 #endif 867 s->s_op = &isofs_sops; 868 s->s_export_op = &isofs_export_ops; 869 sbi->s_mapping = opt.map; 870 sbi->s_rock = (opt.rock ? 2 : 0); 871 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 872 sbi->s_cruft = opt.cruft; 873 sbi->s_hide = opt.hide; 874 sbi->s_showassoc = opt.showassoc; 875 sbi->s_uid = opt.uid; 876 sbi->s_gid = opt.gid; 877 sbi->s_uid_set = opt.uid_set; 878 sbi->s_gid_set = opt.gid_set; 879 sbi->s_utf8 = opt.utf8; 880 sbi->s_nocompress = opt.nocompress; 881 sbi->s_overriderockperm = opt.overriderockperm; 882 /* 883 * It would be incredibly stupid to allow people to mark every file 884 * on the disk as suid, so we merely allow them to set the default 885 * permissions. 886 */ 887 if (opt.fmode != ISOFS_INVALID_MODE) 888 sbi->s_fmode = opt.fmode & 0777; 889 else 890 sbi->s_fmode = ISOFS_INVALID_MODE; 891 if (opt.dmode != ISOFS_INVALID_MODE) 892 sbi->s_dmode = opt.dmode & 0777; 893 else 894 sbi->s_dmode = ISOFS_INVALID_MODE; 895 896 /* 897 * Read the root inode, which _may_ result in changing 898 * the s_rock flag. Once we have the final s_rock value, 899 * we then decide whether to use the Joliet descriptor. 900 */ 901 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 902 if (IS_ERR(inode)) 903 goto out_no_root; 904 905 /* 906 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 907 * correct Joliet root directory. 908 */ 909 if (sbi->s_rock == 1 && joliet_level && 910 rootdir_empty(s, sbi->s_firstdatazone)) { 911 printk(KERN_NOTICE 912 "ISOFS: primary root directory is empty. " 913 "Disabling Rock Ridge and switching to Joliet."); 914 sbi->s_rock = 0; 915 } 916 917 /* 918 * If this disk has both Rock Ridge and Joliet on it, then we 919 * want to use Rock Ridge by default. This can be overridden 920 * by using the norock mount option. There is still one other 921 * possibility that is not taken into account: a Rock Ridge 922 * CD with Unicode names. Until someone sees such a beast, it 923 * will not be supported. 924 */ 925 if (sbi->s_rock == 1) { 926 joliet_level = 0; 927 } else if (joliet_level) { 928 sbi->s_rock = 0; 929 if (sbi->s_firstdatazone != first_data_zone) { 930 sbi->s_firstdatazone = first_data_zone; 931 printk(KERN_DEBUG 932 "ISOFS: changing to secondary root\n"); 933 iput(inode); 934 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 935 if (IS_ERR(inode)) 936 goto out_no_root; 937 } 938 } 939 940 if (opt.check == 'u') { 941 /* Only Joliet is case insensitive by default */ 942 if (joliet_level) 943 opt.check = 'r'; 944 else 945 opt.check = 's'; 946 } 947 sbi->s_joliet_level = joliet_level; 948 949 /* Make sure the root inode is a directory */ 950 if (!S_ISDIR(inode->i_mode)) { 951 printk(KERN_WARNING 952 "isofs_fill_super: root inode is not a directory. " 953 "Corrupted media?\n"); 954 goto out_iput; 955 } 956 957 table = 0; 958 if (joliet_level) 959 table += 2; 960 if (opt.check == 'r') 961 table++; 962 sbi->s_check = opt.check; 963 964 if (table) 965 s->s_d_op = &isofs_dentry_ops[table - 1]; 966 967 /* get the root dentry */ 968 s->s_root = d_make_root(inode); 969 if (!(s->s_root)) { 970 error = -ENOMEM; 971 goto out_no_inode; 972 } 973 974 kfree(opt.iocharset); 975 976 return 0; 977 978 /* 979 * Display error messages and free resources. 980 */ 981 out_iput: 982 iput(inode); 983 goto out_no_inode; 984 out_no_root: 985 error = PTR_ERR(inode); 986 if (error != -ENOMEM) 987 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 988 out_no_inode: 989 #ifdef CONFIG_JOLIET 990 unload_nls(sbi->s_nls_iocharset); 991 #endif 992 goto out_freesbi; 993 out_no_read: 994 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 995 __func__, s->s_id, iso_blknum, block); 996 goto out_freebh; 997 out_bad_zone_size: 998 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 999 sbi->s_log_zone_size); 1000 goto out_freebh; 1001 out_bad_size: 1002 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 1003 orig_zonesize, opt.blocksize); 1004 goto out_freebh; 1005 out_unknown_format: 1006 if (!silent) 1007 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1008 1009 out_freebh: 1010 brelse(bh); 1011 brelse(pri_bh); 1012 out_freesbi: 1013 kfree(opt.iocharset); 1014 kfree(sbi); 1015 s->s_fs_info = NULL; 1016 return error; 1017 } 1018 1019 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1020 { 1021 struct super_block *sb = dentry->d_sb; 1022 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1023 1024 buf->f_type = ISOFS_SUPER_MAGIC; 1025 buf->f_bsize = sb->s_blocksize; 1026 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1027 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1028 buf->f_bfree = 0; 1029 buf->f_bavail = 0; 1030 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1031 buf->f_ffree = 0; 1032 buf->f_fsid.val[0] = (u32)id; 1033 buf->f_fsid.val[1] = (u32)(id >> 32); 1034 buf->f_namelen = NAME_MAX; 1035 return 0; 1036 } 1037 1038 /* 1039 * Get a set of blocks; filling in buffer_heads if already allocated 1040 * or getblk() if they are not. Returns the number of blocks inserted 1041 * (-ve == error.) 1042 */ 1043 int isofs_get_blocks(struct inode *inode, sector_t iblock, 1044 struct buffer_head **bh, unsigned long nblocks) 1045 { 1046 unsigned long b_off = iblock; 1047 unsigned offset, sect_size; 1048 unsigned int firstext; 1049 unsigned long nextblk, nextoff; 1050 int section, rv, error; 1051 struct iso_inode_info *ei = ISOFS_I(inode); 1052 1053 error = -EIO; 1054 rv = 0; 1055 if (iblock != b_off) { 1056 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1057 goto abort; 1058 } 1059 1060 1061 offset = 0; 1062 firstext = ei->i_first_extent; 1063 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1064 nextblk = ei->i_next_section_block; 1065 nextoff = ei->i_next_section_offset; 1066 section = 0; 1067 1068 while (nblocks) { 1069 /* If we are *way* beyond the end of the file, print a message. 1070 * Access beyond the end of the file up to the next page boundary 1071 * is normal, however because of the way the page cache works. 1072 * In this case, we just return 0 so that we can properly fill 1073 * the page with useless information without generating any 1074 * I/O errors. 1075 */ 1076 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1077 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1078 __func__, b_off, 1079 (unsigned long long)inode->i_size); 1080 goto abort; 1081 } 1082 1083 /* On the last section, nextblk == 0, section size is likely to 1084 * exceed sect_size by a partial block, and access beyond the 1085 * end of the file will reach beyond the section size, too. 1086 */ 1087 while (nextblk && (b_off >= (offset + sect_size))) { 1088 struct inode *ninode; 1089 1090 offset += sect_size; 1091 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1092 if (IS_ERR(ninode)) { 1093 error = PTR_ERR(ninode); 1094 goto abort; 1095 } 1096 firstext = ISOFS_I(ninode)->i_first_extent; 1097 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1098 nextblk = ISOFS_I(ninode)->i_next_section_block; 1099 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1100 iput(ninode); 1101 1102 if (++section > 100) { 1103 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1104 " aborting...\n", __func__); 1105 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1106 "nextblk=%lu nextoff=%lu\n", __func__, 1107 b_off, firstext, (unsigned) sect_size, 1108 nextblk, nextoff); 1109 goto abort; 1110 } 1111 } 1112 1113 if (*bh) { 1114 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1115 } else { 1116 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1117 if (!*bh) 1118 goto abort; 1119 } 1120 bh++; /* Next buffer head */ 1121 b_off++; /* Next buffer offset */ 1122 nblocks--; 1123 rv++; 1124 } 1125 1126 error = 0; 1127 abort: 1128 return rv != 0 ? rv : error; 1129 } 1130 1131 /* 1132 * Used by the standard interfaces. 1133 */ 1134 static int isofs_get_block(struct inode *inode, sector_t iblock, 1135 struct buffer_head *bh_result, int create) 1136 { 1137 int ret; 1138 1139 if (create) { 1140 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1141 return -EROFS; 1142 } 1143 1144 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1145 return ret < 0 ? ret : 0; 1146 } 1147 1148 static int isofs_bmap(struct inode *inode, sector_t block) 1149 { 1150 struct buffer_head dummy; 1151 int error; 1152 1153 dummy.b_state = 0; 1154 dummy.b_blocknr = -1000; 1155 error = isofs_get_block(inode, block, &dummy, 0); 1156 if (!error) 1157 return dummy.b_blocknr; 1158 return 0; 1159 } 1160 1161 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1162 { 1163 sector_t blknr = isofs_bmap(inode, block); 1164 if (!blknr) 1165 return NULL; 1166 return sb_bread(inode->i_sb, blknr); 1167 } 1168 1169 static int isofs_readpage(struct file *file, struct page *page) 1170 { 1171 return mpage_readpage(page, isofs_get_block); 1172 } 1173 1174 static int isofs_readpages(struct file *file, struct address_space *mapping, 1175 struct list_head *pages, unsigned nr_pages) 1176 { 1177 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); 1178 } 1179 1180 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1181 { 1182 return generic_block_bmap(mapping,block,isofs_get_block); 1183 } 1184 1185 static const struct address_space_operations isofs_aops = { 1186 .readpage = isofs_readpage, 1187 .readpages = isofs_readpages, 1188 .bmap = _isofs_bmap 1189 }; 1190 1191 static int isofs_read_level3_size(struct inode *inode) 1192 { 1193 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1194 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1195 struct buffer_head *bh = NULL; 1196 unsigned long block, offset, block_saved, offset_saved; 1197 int i = 0; 1198 int more_entries = 0; 1199 struct iso_directory_record *tmpde = NULL; 1200 struct iso_inode_info *ei = ISOFS_I(inode); 1201 1202 inode->i_size = 0; 1203 1204 /* The first 16 blocks are reserved as the System Area. Thus, 1205 * no inodes can appear in block 0. We use this to flag that 1206 * this is the last section. */ 1207 ei->i_next_section_block = 0; 1208 ei->i_next_section_offset = 0; 1209 1210 block = ei->i_iget5_block; 1211 offset = ei->i_iget5_offset; 1212 1213 do { 1214 struct iso_directory_record *de; 1215 unsigned int de_len; 1216 1217 if (!bh) { 1218 bh = sb_bread(inode->i_sb, block); 1219 if (!bh) 1220 goto out_noread; 1221 } 1222 de = (struct iso_directory_record *) (bh->b_data + offset); 1223 de_len = *(unsigned char *) de; 1224 1225 if (de_len == 0) { 1226 brelse(bh); 1227 bh = NULL; 1228 ++block; 1229 offset = 0; 1230 continue; 1231 } 1232 1233 block_saved = block; 1234 offset_saved = offset; 1235 offset += de_len; 1236 1237 /* Make sure we have a full directory entry */ 1238 if (offset >= bufsize) { 1239 int slop = bufsize - offset + de_len; 1240 if (!tmpde) { 1241 tmpde = kmalloc(256, GFP_KERNEL); 1242 if (!tmpde) 1243 goto out_nomem; 1244 } 1245 memcpy(tmpde, de, slop); 1246 offset &= bufsize - 1; 1247 block++; 1248 brelse(bh); 1249 bh = NULL; 1250 if (offset) { 1251 bh = sb_bread(inode->i_sb, block); 1252 if (!bh) 1253 goto out_noread; 1254 memcpy((void *)tmpde+slop, bh->b_data, offset); 1255 } 1256 de = tmpde; 1257 } 1258 1259 inode->i_size += isonum_733(de->size); 1260 if (i == 1) { 1261 ei->i_next_section_block = block_saved; 1262 ei->i_next_section_offset = offset_saved; 1263 } 1264 1265 more_entries = de->flags[-high_sierra] & 0x80; 1266 1267 i++; 1268 if (i > 100) 1269 goto out_toomany; 1270 } while (more_entries); 1271 out: 1272 kfree(tmpde); 1273 if (bh) 1274 brelse(bh); 1275 return 0; 1276 1277 out_nomem: 1278 if (bh) 1279 brelse(bh); 1280 return -ENOMEM; 1281 1282 out_noread: 1283 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1284 kfree(tmpde); 1285 return -EIO; 1286 1287 out_toomany: 1288 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1289 "isofs_read_level3_size: inode=%lu\n", 1290 __func__, inode->i_ino); 1291 goto out; 1292 } 1293 1294 static int isofs_read_inode(struct inode *inode, int relocated) 1295 { 1296 struct super_block *sb = inode->i_sb; 1297 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1298 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1299 unsigned long block; 1300 int high_sierra = sbi->s_high_sierra; 1301 struct buffer_head *bh; 1302 struct iso_directory_record *de; 1303 struct iso_directory_record *tmpde = NULL; 1304 unsigned int de_len; 1305 unsigned long offset; 1306 struct iso_inode_info *ei = ISOFS_I(inode); 1307 int ret = -EIO; 1308 1309 block = ei->i_iget5_block; 1310 bh = sb_bread(inode->i_sb, block); 1311 if (!bh) 1312 goto out_badread; 1313 1314 offset = ei->i_iget5_offset; 1315 1316 de = (struct iso_directory_record *) (bh->b_data + offset); 1317 de_len = *(unsigned char *) de; 1318 1319 if (offset + de_len > bufsize) { 1320 int frag1 = bufsize - offset; 1321 1322 tmpde = kmalloc(de_len, GFP_KERNEL); 1323 if (!tmpde) { 1324 ret = -ENOMEM; 1325 goto fail; 1326 } 1327 memcpy(tmpde, bh->b_data + offset, frag1); 1328 brelse(bh); 1329 bh = sb_bread(inode->i_sb, ++block); 1330 if (!bh) 1331 goto out_badread; 1332 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1333 de = tmpde; 1334 } 1335 1336 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1337 ei->i_iget5_offset, 1338 ISOFS_BUFFER_BITS(inode)); 1339 1340 /* Assume it is a normal-format file unless told otherwise */ 1341 ei->i_file_format = isofs_file_normal; 1342 1343 if (de->flags[-high_sierra] & 2) { 1344 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1345 inode->i_mode = S_IFDIR | sbi->s_dmode; 1346 else 1347 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1348 set_nlink(inode, 1); /* 1349 * Set to 1. We know there are 2, but 1350 * the find utility tries to optimize 1351 * if it is 2, and it screws up. It is 1352 * easier to give 1 which tells find to 1353 * do it the hard way. 1354 */ 1355 } else { 1356 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1357 inode->i_mode = S_IFREG | sbi->s_fmode; 1358 } else { 1359 /* 1360 * Set default permissions: r-x for all. The disc 1361 * could be shared with DOS machines so virtually 1362 * anything could be a valid executable. 1363 */ 1364 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1365 } 1366 set_nlink(inode, 1); 1367 } 1368 inode->i_uid = sbi->s_uid; 1369 inode->i_gid = sbi->s_gid; 1370 inode->i_blocks = 0; 1371 1372 ei->i_format_parm[0] = 0; 1373 ei->i_format_parm[1] = 0; 1374 ei->i_format_parm[2] = 0; 1375 1376 ei->i_section_size = isonum_733(de->size); 1377 if (de->flags[-high_sierra] & 0x80) { 1378 ret = isofs_read_level3_size(inode); 1379 if (ret < 0) 1380 goto fail; 1381 ret = -EIO; 1382 } else { 1383 ei->i_next_section_block = 0; 1384 ei->i_next_section_offset = 0; 1385 inode->i_size = isonum_733(de->size); 1386 } 1387 1388 /* 1389 * Some dipshit decided to store some other bit of information 1390 * in the high byte of the file length. Truncate size in case 1391 * this CDROM was mounted with the cruft option. 1392 */ 1393 1394 if (sbi->s_cruft) 1395 inode->i_size &= 0x00ffffff; 1396 1397 if (de->interleave[0]) { 1398 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1399 inode->i_size = 0; 1400 } 1401 1402 /* I have no idea what file_unit_size is used for, so 1403 we will flag it for now */ 1404 if (de->file_unit_size[0] != 0) { 1405 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1406 inode->i_ino); 1407 } 1408 1409 /* I have no idea what other flag bits are used for, so 1410 we will flag it for now */ 1411 #ifdef DEBUG 1412 if((de->flags[-high_sierra] & ~2)!= 0){ 1413 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1414 "(%ld %x).\n", 1415 inode->i_ino, de->flags[-high_sierra]); 1416 } 1417 #endif 1418 1419 inode->i_mtime.tv_sec = 1420 inode->i_atime.tv_sec = 1421 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1422 inode->i_mtime.tv_nsec = 1423 inode->i_atime.tv_nsec = 1424 inode->i_ctime.tv_nsec = 0; 1425 1426 ei->i_first_extent = (isonum_733(de->extent) + 1427 isonum_711(de->ext_attr_length)); 1428 1429 /* Set the number of blocks for stat() - should be done before RR */ 1430 inode->i_blocks = (inode->i_size + 511) >> 9; 1431 1432 /* 1433 * Now test for possible Rock Ridge extensions which will override 1434 * some of these numbers in the inode structure. 1435 */ 1436 1437 if (!high_sierra) { 1438 parse_rock_ridge_inode(de, inode, relocated); 1439 /* if we want uid/gid set, override the rock ridge setting */ 1440 if (sbi->s_uid_set) 1441 inode->i_uid = sbi->s_uid; 1442 if (sbi->s_gid_set) 1443 inode->i_gid = sbi->s_gid; 1444 } 1445 /* Now set final access rights if overriding rock ridge setting */ 1446 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1447 sbi->s_dmode != ISOFS_INVALID_MODE) 1448 inode->i_mode = S_IFDIR | sbi->s_dmode; 1449 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1450 sbi->s_fmode != ISOFS_INVALID_MODE) 1451 inode->i_mode = S_IFREG | sbi->s_fmode; 1452 1453 /* Install the inode operations vector */ 1454 if (S_ISREG(inode->i_mode)) { 1455 inode->i_fop = &generic_ro_fops; 1456 switch (ei->i_file_format) { 1457 #ifdef CONFIG_ZISOFS 1458 case isofs_file_compressed: 1459 inode->i_data.a_ops = &zisofs_aops; 1460 break; 1461 #endif 1462 default: 1463 inode->i_data.a_ops = &isofs_aops; 1464 break; 1465 } 1466 } else if (S_ISDIR(inode->i_mode)) { 1467 inode->i_op = &isofs_dir_inode_operations; 1468 inode->i_fop = &isofs_dir_operations; 1469 } else if (S_ISLNK(inode->i_mode)) { 1470 inode->i_op = &page_symlink_inode_operations; 1471 inode_nohighmem(inode); 1472 inode->i_data.a_ops = &isofs_symlink_aops; 1473 } else 1474 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1475 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1476 1477 ret = 0; 1478 out: 1479 kfree(tmpde); 1480 if (bh) 1481 brelse(bh); 1482 return ret; 1483 1484 out_badread: 1485 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1486 fail: 1487 goto out; 1488 } 1489 1490 struct isofs_iget5_callback_data { 1491 unsigned long block; 1492 unsigned long offset; 1493 }; 1494 1495 static int isofs_iget5_test(struct inode *ino, void *data) 1496 { 1497 struct iso_inode_info *i = ISOFS_I(ino); 1498 struct isofs_iget5_callback_data *d = 1499 (struct isofs_iget5_callback_data*)data; 1500 return (i->i_iget5_block == d->block) 1501 && (i->i_iget5_offset == d->offset); 1502 } 1503 1504 static int isofs_iget5_set(struct inode *ino, void *data) 1505 { 1506 struct iso_inode_info *i = ISOFS_I(ino); 1507 struct isofs_iget5_callback_data *d = 1508 (struct isofs_iget5_callback_data*)data; 1509 i->i_iget5_block = d->block; 1510 i->i_iget5_offset = d->offset; 1511 return 0; 1512 } 1513 1514 /* Store, in the inode's containing structure, the block and block 1515 * offset that point to the underlying meta-data for the inode. The 1516 * code below is otherwise similar to the iget() code in 1517 * include/linux/fs.h */ 1518 struct inode *__isofs_iget(struct super_block *sb, 1519 unsigned long block, 1520 unsigned long offset, 1521 int relocated) 1522 { 1523 unsigned long hashval; 1524 struct inode *inode; 1525 struct isofs_iget5_callback_data data; 1526 long ret; 1527 1528 if (offset >= 1ul << sb->s_blocksize_bits) 1529 return ERR_PTR(-EINVAL); 1530 1531 data.block = block; 1532 data.offset = offset; 1533 1534 hashval = (block << sb->s_blocksize_bits) | offset; 1535 1536 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1537 &isofs_iget5_set, &data); 1538 1539 if (!inode) 1540 return ERR_PTR(-ENOMEM); 1541 1542 if (inode->i_state & I_NEW) { 1543 ret = isofs_read_inode(inode, relocated); 1544 if (ret < 0) { 1545 iget_failed(inode); 1546 inode = ERR_PTR(ret); 1547 } else { 1548 unlock_new_inode(inode); 1549 } 1550 } 1551 1552 return inode; 1553 } 1554 1555 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1556 int flags, const char *dev_name, void *data) 1557 { 1558 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1559 } 1560 1561 static struct file_system_type iso9660_fs_type = { 1562 .owner = THIS_MODULE, 1563 .name = "iso9660", 1564 .mount = isofs_mount, 1565 .kill_sb = kill_block_super, 1566 .fs_flags = FS_REQUIRES_DEV, 1567 }; 1568 MODULE_ALIAS_FS("iso9660"); 1569 MODULE_ALIAS("iso9660"); 1570 1571 static int __init init_iso9660_fs(void) 1572 { 1573 int err = init_inodecache(); 1574 if (err) 1575 goto out; 1576 #ifdef CONFIG_ZISOFS 1577 err = zisofs_init(); 1578 if (err) 1579 goto out1; 1580 #endif 1581 err = register_filesystem(&iso9660_fs_type); 1582 if (err) 1583 goto out2; 1584 return 0; 1585 out2: 1586 #ifdef CONFIG_ZISOFS 1587 zisofs_cleanup(); 1588 out1: 1589 #endif 1590 destroy_inodecache(); 1591 out: 1592 return err; 1593 } 1594 1595 static void __exit exit_iso9660_fs(void) 1596 { 1597 unregister_filesystem(&iso9660_fs_type); 1598 #ifdef CONFIG_ZISOFS 1599 zisofs_cleanup(); 1600 #endif 1601 destroy_inodecache(); 1602 } 1603 1604 module_init(init_iso9660_fs) 1605 module_exit(exit_iso9660_fs) 1606 MODULE_LICENSE("GPL"); 1607