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 & SB_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 #ifdef CONFIG_JOLIET 518 if (sbi->s_nls_iocharset && 519 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) 520 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 521 #endif 522 return 0; 523 } 524 525 /* 526 * look if the driver can tell the multi session redirection value 527 * 528 * don't change this if you don't know what you do, please! 529 * Multisession is legal only with XA disks. 530 * A non-XA disk with more than one volume descriptor may do it right, but 531 * usually is written in a nowhere standardized "multi-partition" manner. 532 * Multisession uses absolute addressing (solely the first frame of the whole 533 * track is #0), multi-partition uses relative addressing (each first frame of 534 * each track is #0), and a track is not a session. 535 * 536 * A broken CDwriter software or drive firmware does not set new standards, 537 * at least not if conflicting with the existing ones. 538 * 539 * emoenke@gwdg.de 540 */ 541 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 542 543 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 544 { 545 struct cdrom_multisession ms_info; 546 unsigned int vol_desc_start; 547 struct block_device *bdev = sb->s_bdev; 548 int i; 549 550 vol_desc_start=0; 551 ms_info.addr_format=CDROM_LBA; 552 if (session > 0) { 553 struct cdrom_tocentry Te; 554 Te.cdte_track=session; 555 Te.cdte_format=CDROM_LBA; 556 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); 557 if (!i) { 558 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 559 session, Te.cdte_addr.lba, 560 Te.cdte_ctrl&CDROM_DATA_TRACK); 561 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) 562 return Te.cdte_addr.lba; 563 } 564 565 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 566 } 567 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); 568 if (session > 0) 569 printk(KERN_ERR "ISOFS: Invalid session number\n"); 570 #if 0 571 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); 572 if (i==0) { 573 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); 574 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); 575 } 576 #endif 577 if (i==0) 578 #if WE_OBEY_THE_WRITTEN_STANDARDS 579 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ 580 #endif 581 vol_desc_start=ms_info.addr.lba; 582 return vol_desc_start; 583 } 584 585 /* 586 * Check if root directory is empty (has less than 3 files). 587 * 588 * Used to detect broken CDs where ISO root directory is empty but Joliet root 589 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 590 * (and Joliet used instead) or else no files would be visible. 591 */ 592 static bool rootdir_empty(struct super_block *sb, unsigned long block) 593 { 594 int offset = 0, files = 0, de_len; 595 struct iso_directory_record *de; 596 struct buffer_head *bh; 597 598 bh = sb_bread(sb, block); 599 if (!bh) 600 return true; 601 while (files < 3) { 602 de = (struct iso_directory_record *) (bh->b_data + offset); 603 de_len = *(unsigned char *) de; 604 if (de_len == 0) 605 break; 606 files++; 607 offset += de_len; 608 } 609 brelse(bh); 610 return files < 3; 611 } 612 613 /* 614 * Initialize the superblock and read the root inode. 615 * 616 * Note: a check_disk_change() has been done immediately prior 617 * to this call, so we don't need to check again. 618 */ 619 static int isofs_fill_super(struct super_block *s, void *data, int silent) 620 { 621 struct buffer_head *bh = NULL, *pri_bh = NULL; 622 struct hs_primary_descriptor *h_pri = NULL; 623 struct iso_primary_descriptor *pri = NULL; 624 struct iso_supplementary_descriptor *sec = NULL; 625 struct iso_directory_record *rootp; 626 struct inode *inode; 627 struct iso9660_options opt; 628 struct isofs_sb_info *sbi; 629 unsigned long first_data_zone; 630 int joliet_level = 0; 631 int iso_blknum, block; 632 int orig_zonesize; 633 int table, error = -EINVAL; 634 unsigned int vol_desc_start; 635 636 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 637 if (!sbi) 638 return -ENOMEM; 639 s->s_fs_info = sbi; 640 641 if (!parse_options((char *)data, &opt)) 642 goto out_freesbi; 643 644 /* 645 * First of all, get the hardware blocksize for this device. 646 * If we don't know what it is, or the hardware blocksize is 647 * larger than the blocksize the user specified, then use 648 * that value. 649 */ 650 /* 651 * What if bugger tells us to go beyond page size? 652 */ 653 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 654 655 sbi->s_high_sierra = 0; /* default is iso9660 */ 656 sbi->s_session = opt.session; 657 sbi->s_sbsector = opt.sbsector; 658 659 vol_desc_start = (opt.sbsector != -1) ? 660 opt.sbsector : isofs_get_last_session(s,opt.session); 661 662 for (iso_blknum = vol_desc_start+16; 663 iso_blknum < vol_desc_start+100; iso_blknum++) { 664 struct hs_volume_descriptor *hdp; 665 struct iso_volume_descriptor *vdp; 666 667 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 668 if (!(bh = sb_bread(s, block))) 669 goto out_no_read; 670 671 vdp = (struct iso_volume_descriptor *)bh->b_data; 672 hdp = (struct hs_volume_descriptor *)bh->b_data; 673 674 /* 675 * Due to the overlapping physical location of the descriptors, 676 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 677 * proper identification in this case, we first check for ISO. 678 */ 679 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 680 if (isonum_711(vdp->type) == ISO_VD_END) 681 break; 682 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 683 if (!pri) { 684 pri = (struct iso_primary_descriptor *)vdp; 685 /* Save the buffer in case we need it ... */ 686 pri_bh = bh; 687 bh = NULL; 688 } 689 } 690 #ifdef CONFIG_JOLIET 691 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 692 sec = (struct iso_supplementary_descriptor *)vdp; 693 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 694 if (opt.joliet) { 695 if (sec->escape[2] == 0x40) 696 joliet_level = 1; 697 else if (sec->escape[2] == 0x43) 698 joliet_level = 2; 699 else if (sec->escape[2] == 0x45) 700 joliet_level = 3; 701 702 printk(KERN_DEBUG "ISO 9660 Extensions: " 703 "Microsoft Joliet Level %d\n", 704 joliet_level); 705 } 706 goto root_found; 707 } else { 708 /* Unknown supplementary volume descriptor */ 709 sec = NULL; 710 } 711 } 712 #endif 713 } else { 714 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 715 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 716 goto out_freebh; 717 718 sbi->s_high_sierra = 1; 719 opt.rock = 0; 720 h_pri = (struct hs_primary_descriptor *)vdp; 721 goto root_found; 722 } 723 } 724 725 /* Just skip any volume descriptors we don't recognize */ 726 727 brelse(bh); 728 bh = NULL; 729 } 730 /* 731 * If we fall through, either no volume descriptor was found, 732 * or else we passed a primary descriptor looking for others. 733 */ 734 if (!pri) 735 goto out_unknown_format; 736 brelse(bh); 737 bh = pri_bh; 738 pri_bh = NULL; 739 740 root_found: 741 /* We don't support read-write mounts */ 742 if (!sb_rdonly(s)) { 743 error = -EACCES; 744 goto out_freebh; 745 } 746 747 if (joliet_level && (!pri || !opt.rock)) { 748 /* This is the case of Joliet with the norock mount flag. 749 * A disc with both Joliet and Rock Ridge is handled later 750 */ 751 pri = (struct iso_primary_descriptor *) sec; 752 } 753 754 if(sbi->s_high_sierra){ 755 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 756 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 757 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 758 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 759 } else { 760 if (!pri) 761 goto out_freebh; 762 rootp = (struct iso_directory_record *) pri->root_directory_record; 763 sbi->s_nzones = isonum_733(pri->volume_space_size); 764 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 765 sbi->s_max_size = isonum_733(pri->volume_space_size); 766 } 767 768 sbi->s_ninodes = 0; /* No way to figure this out easily */ 769 770 orig_zonesize = sbi->s_log_zone_size; 771 /* 772 * If the zone size is smaller than the hardware sector size, 773 * this is a fatal error. This would occur if the disc drive 774 * had sectors that were 2048 bytes, but the filesystem had 775 * blocks that were 512 bytes (which should only very rarely 776 * happen.) 777 */ 778 if (orig_zonesize < opt.blocksize) 779 goto out_bad_size; 780 781 /* RDE: convert log zone size to bit shift */ 782 switch (sbi->s_log_zone_size) { 783 case 512: sbi->s_log_zone_size = 9; break; 784 case 1024: sbi->s_log_zone_size = 10; break; 785 case 2048: sbi->s_log_zone_size = 11; break; 786 787 default: 788 goto out_bad_zone_size; 789 } 790 791 s->s_magic = ISOFS_SUPER_MAGIC; 792 793 /* 794 * With multi-extent files, file size is only limited by the maximum 795 * size of a file system, which is 8 TB. 796 */ 797 s->s_maxbytes = 0x80000000000LL; 798 799 /* Set this for reference. Its not currently used except on write 800 which we don't have .. */ 801 802 first_data_zone = isonum_733(rootp->extent) + 803 isonum_711(rootp->ext_attr_length); 804 sbi->s_firstdatazone = first_data_zone; 805 #ifndef BEQUIET 806 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 807 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 808 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 809 if(sbi->s_high_sierra) 810 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 811 #endif 812 813 /* 814 * If the Joliet level is set, we _may_ decide to use the 815 * secondary descriptor, but can't be sure until after we 816 * read the root inode. But before reading the root inode 817 * we may need to change the device blocksize, and would 818 * rather release the old buffer first. So, we cache the 819 * first_data_zone value from the secondary descriptor. 820 */ 821 if (joliet_level) { 822 pri = (struct iso_primary_descriptor *) sec; 823 rootp = (struct iso_directory_record *) 824 pri->root_directory_record; 825 first_data_zone = isonum_733(rootp->extent) + 826 isonum_711(rootp->ext_attr_length); 827 } 828 829 /* 830 * We're all done using the volume descriptor, and may need 831 * to change the device blocksize, so release the buffer now. 832 */ 833 brelse(pri_bh); 834 brelse(bh); 835 836 /* 837 * Force the blocksize to 512 for 512 byte sectors. The file 838 * read primitives really get it wrong in a bad way if we don't 839 * do this. 840 * 841 * Note - we should never be setting the blocksize to something 842 * less than the hardware sector size for the device. If we 843 * do, we would end up having to read larger buffers and split 844 * out portions to satisfy requests. 845 * 846 * Note2- the idea here is that we want to deal with the optimal 847 * zonesize in the filesystem. If we have it set to something less, 848 * then we have horrible problems with trying to piece together 849 * bits of adjacent blocks in order to properly read directory 850 * entries. By forcing the blocksize in this way, we ensure 851 * that we will never be required to do this. 852 */ 853 sb_set_blocksize(s, orig_zonesize); 854 855 sbi->s_nls_iocharset = NULL; 856 857 #ifdef CONFIG_JOLIET 858 if (joliet_level && opt.utf8 == 0) { 859 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 860 sbi->s_nls_iocharset = load_nls(p); 861 if (! sbi->s_nls_iocharset) { 862 /* Fail only if explicit charset specified */ 863 if (opt.iocharset) 864 goto out_freesbi; 865 sbi->s_nls_iocharset = load_nls_default(); 866 } 867 } 868 #endif 869 s->s_op = &isofs_sops; 870 s->s_export_op = &isofs_export_ops; 871 sbi->s_mapping = opt.map; 872 sbi->s_rock = (opt.rock ? 2 : 0); 873 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 874 sbi->s_cruft = opt.cruft; 875 sbi->s_hide = opt.hide; 876 sbi->s_showassoc = opt.showassoc; 877 sbi->s_uid = opt.uid; 878 sbi->s_gid = opt.gid; 879 sbi->s_uid_set = opt.uid_set; 880 sbi->s_gid_set = opt.gid_set; 881 sbi->s_utf8 = opt.utf8; 882 sbi->s_nocompress = opt.nocompress; 883 sbi->s_overriderockperm = opt.overriderockperm; 884 /* 885 * It would be incredibly stupid to allow people to mark every file 886 * on the disk as suid, so we merely allow them to set the default 887 * permissions. 888 */ 889 if (opt.fmode != ISOFS_INVALID_MODE) 890 sbi->s_fmode = opt.fmode & 0777; 891 else 892 sbi->s_fmode = ISOFS_INVALID_MODE; 893 if (opt.dmode != ISOFS_INVALID_MODE) 894 sbi->s_dmode = opt.dmode & 0777; 895 else 896 sbi->s_dmode = ISOFS_INVALID_MODE; 897 898 /* 899 * Read the root inode, which _may_ result in changing 900 * the s_rock flag. Once we have the final s_rock value, 901 * we then decide whether to use the Joliet descriptor. 902 */ 903 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 904 if (IS_ERR(inode)) 905 goto out_no_root; 906 907 /* 908 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 909 * correct Joliet root directory. 910 */ 911 if (sbi->s_rock == 1 && joliet_level && 912 rootdir_empty(s, sbi->s_firstdatazone)) { 913 printk(KERN_NOTICE 914 "ISOFS: primary root directory is empty. " 915 "Disabling Rock Ridge and switching to Joliet."); 916 sbi->s_rock = 0; 917 } 918 919 /* 920 * If this disk has both Rock Ridge and Joliet on it, then we 921 * want to use Rock Ridge by default. This can be overridden 922 * by using the norock mount option. There is still one other 923 * possibility that is not taken into account: a Rock Ridge 924 * CD with Unicode names. Until someone sees such a beast, it 925 * will not be supported. 926 */ 927 if (sbi->s_rock == 1) { 928 joliet_level = 0; 929 } else if (joliet_level) { 930 sbi->s_rock = 0; 931 if (sbi->s_firstdatazone != first_data_zone) { 932 sbi->s_firstdatazone = first_data_zone; 933 printk(KERN_DEBUG 934 "ISOFS: changing to secondary root\n"); 935 iput(inode); 936 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 937 if (IS_ERR(inode)) 938 goto out_no_root; 939 } 940 } 941 942 if (opt.check == 'u') { 943 /* Only Joliet is case insensitive by default */ 944 if (joliet_level) 945 opt.check = 'r'; 946 else 947 opt.check = 's'; 948 } 949 sbi->s_joliet_level = joliet_level; 950 951 /* Make sure the root inode is a directory */ 952 if (!S_ISDIR(inode->i_mode)) { 953 printk(KERN_WARNING 954 "isofs_fill_super: root inode is not a directory. " 955 "Corrupted media?\n"); 956 goto out_iput; 957 } 958 959 table = 0; 960 if (joliet_level) 961 table += 2; 962 if (opt.check == 'r') 963 table++; 964 sbi->s_check = opt.check; 965 966 if (table) 967 s->s_d_op = &isofs_dentry_ops[table - 1]; 968 969 /* get the root dentry */ 970 s->s_root = d_make_root(inode); 971 if (!(s->s_root)) { 972 error = -ENOMEM; 973 goto out_no_inode; 974 } 975 976 kfree(opt.iocharset); 977 978 return 0; 979 980 /* 981 * Display error messages and free resources. 982 */ 983 out_iput: 984 iput(inode); 985 goto out_no_inode; 986 out_no_root: 987 error = PTR_ERR(inode); 988 if (error != -ENOMEM) 989 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 990 out_no_inode: 991 #ifdef CONFIG_JOLIET 992 unload_nls(sbi->s_nls_iocharset); 993 #endif 994 goto out_freesbi; 995 out_no_read: 996 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 997 __func__, s->s_id, iso_blknum, block); 998 goto out_freebh; 999 out_bad_zone_size: 1000 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 1001 sbi->s_log_zone_size); 1002 goto out_freebh; 1003 out_bad_size: 1004 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 1005 orig_zonesize, opt.blocksize); 1006 goto out_freebh; 1007 out_unknown_format: 1008 if (!silent) 1009 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1010 1011 out_freebh: 1012 brelse(bh); 1013 brelse(pri_bh); 1014 out_freesbi: 1015 kfree(opt.iocharset); 1016 kfree(sbi); 1017 s->s_fs_info = NULL; 1018 return error; 1019 } 1020 1021 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1022 { 1023 struct super_block *sb = dentry->d_sb; 1024 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1025 1026 buf->f_type = ISOFS_SUPER_MAGIC; 1027 buf->f_bsize = sb->s_blocksize; 1028 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1029 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1030 buf->f_bfree = 0; 1031 buf->f_bavail = 0; 1032 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1033 buf->f_ffree = 0; 1034 buf->f_fsid.val[0] = (u32)id; 1035 buf->f_fsid.val[1] = (u32)(id >> 32); 1036 buf->f_namelen = NAME_MAX; 1037 return 0; 1038 } 1039 1040 /* 1041 * Get a set of blocks; filling in buffer_heads if already allocated 1042 * or getblk() if they are not. Returns the number of blocks inserted 1043 * (-ve == error.) 1044 */ 1045 int isofs_get_blocks(struct inode *inode, sector_t iblock, 1046 struct buffer_head **bh, unsigned long nblocks) 1047 { 1048 unsigned long b_off = iblock; 1049 unsigned offset, sect_size; 1050 unsigned int firstext; 1051 unsigned long nextblk, nextoff; 1052 int section, rv, error; 1053 struct iso_inode_info *ei = ISOFS_I(inode); 1054 1055 error = -EIO; 1056 rv = 0; 1057 if (iblock != b_off) { 1058 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1059 goto abort; 1060 } 1061 1062 1063 offset = 0; 1064 firstext = ei->i_first_extent; 1065 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1066 nextblk = ei->i_next_section_block; 1067 nextoff = ei->i_next_section_offset; 1068 section = 0; 1069 1070 while (nblocks) { 1071 /* If we are *way* beyond the end of the file, print a message. 1072 * Access beyond the end of the file up to the next page boundary 1073 * is normal, however because of the way the page cache works. 1074 * In this case, we just return 0 so that we can properly fill 1075 * the page with useless information without generating any 1076 * I/O errors. 1077 */ 1078 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1079 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1080 __func__, b_off, 1081 (unsigned long long)inode->i_size); 1082 goto abort; 1083 } 1084 1085 /* On the last section, nextblk == 0, section size is likely to 1086 * exceed sect_size by a partial block, and access beyond the 1087 * end of the file will reach beyond the section size, too. 1088 */ 1089 while (nextblk && (b_off >= (offset + sect_size))) { 1090 struct inode *ninode; 1091 1092 offset += sect_size; 1093 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1094 if (IS_ERR(ninode)) { 1095 error = PTR_ERR(ninode); 1096 goto abort; 1097 } 1098 firstext = ISOFS_I(ninode)->i_first_extent; 1099 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1100 nextblk = ISOFS_I(ninode)->i_next_section_block; 1101 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1102 iput(ninode); 1103 1104 if (++section > 100) { 1105 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1106 " aborting...\n", __func__); 1107 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1108 "nextblk=%lu nextoff=%lu\n", __func__, 1109 b_off, firstext, (unsigned) sect_size, 1110 nextblk, nextoff); 1111 goto abort; 1112 } 1113 } 1114 1115 if (*bh) { 1116 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1117 } else { 1118 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1119 if (!*bh) 1120 goto abort; 1121 } 1122 bh++; /* Next buffer head */ 1123 b_off++; /* Next buffer offset */ 1124 nblocks--; 1125 rv++; 1126 } 1127 1128 error = 0; 1129 abort: 1130 return rv != 0 ? rv : error; 1131 } 1132 1133 /* 1134 * Used by the standard interfaces. 1135 */ 1136 static int isofs_get_block(struct inode *inode, sector_t iblock, 1137 struct buffer_head *bh_result, int create) 1138 { 1139 int ret; 1140 1141 if (create) { 1142 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1143 return -EROFS; 1144 } 1145 1146 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1147 return ret < 0 ? ret : 0; 1148 } 1149 1150 static int isofs_bmap(struct inode *inode, sector_t block) 1151 { 1152 struct buffer_head dummy; 1153 int error; 1154 1155 dummy.b_state = 0; 1156 dummy.b_blocknr = -1000; 1157 error = isofs_get_block(inode, block, &dummy, 0); 1158 if (!error) 1159 return dummy.b_blocknr; 1160 return 0; 1161 } 1162 1163 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1164 { 1165 sector_t blknr = isofs_bmap(inode, block); 1166 if (!blknr) 1167 return NULL; 1168 return sb_bread(inode->i_sb, blknr); 1169 } 1170 1171 static int isofs_readpage(struct file *file, struct page *page) 1172 { 1173 return mpage_readpage(page, isofs_get_block); 1174 } 1175 1176 static int isofs_readpages(struct file *file, struct address_space *mapping, 1177 struct list_head *pages, unsigned nr_pages) 1178 { 1179 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); 1180 } 1181 1182 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1183 { 1184 return generic_block_bmap(mapping,block,isofs_get_block); 1185 } 1186 1187 static const struct address_space_operations isofs_aops = { 1188 .readpage = isofs_readpage, 1189 .readpages = isofs_readpages, 1190 .bmap = _isofs_bmap 1191 }; 1192 1193 static int isofs_read_level3_size(struct inode *inode) 1194 { 1195 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1196 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1197 struct buffer_head *bh = NULL; 1198 unsigned long block, offset, block_saved, offset_saved; 1199 int i = 0; 1200 int more_entries = 0; 1201 struct iso_directory_record *tmpde = NULL; 1202 struct iso_inode_info *ei = ISOFS_I(inode); 1203 1204 inode->i_size = 0; 1205 1206 /* The first 16 blocks are reserved as the System Area. Thus, 1207 * no inodes can appear in block 0. We use this to flag that 1208 * this is the last section. */ 1209 ei->i_next_section_block = 0; 1210 ei->i_next_section_offset = 0; 1211 1212 block = ei->i_iget5_block; 1213 offset = ei->i_iget5_offset; 1214 1215 do { 1216 struct iso_directory_record *de; 1217 unsigned int de_len; 1218 1219 if (!bh) { 1220 bh = sb_bread(inode->i_sb, block); 1221 if (!bh) 1222 goto out_noread; 1223 } 1224 de = (struct iso_directory_record *) (bh->b_data + offset); 1225 de_len = *(unsigned char *) de; 1226 1227 if (de_len == 0) { 1228 brelse(bh); 1229 bh = NULL; 1230 ++block; 1231 offset = 0; 1232 continue; 1233 } 1234 1235 block_saved = block; 1236 offset_saved = offset; 1237 offset += de_len; 1238 1239 /* Make sure we have a full directory entry */ 1240 if (offset >= bufsize) { 1241 int slop = bufsize - offset + de_len; 1242 if (!tmpde) { 1243 tmpde = kmalloc(256, GFP_KERNEL); 1244 if (!tmpde) 1245 goto out_nomem; 1246 } 1247 memcpy(tmpde, de, slop); 1248 offset &= bufsize - 1; 1249 block++; 1250 brelse(bh); 1251 bh = NULL; 1252 if (offset) { 1253 bh = sb_bread(inode->i_sb, block); 1254 if (!bh) 1255 goto out_noread; 1256 memcpy((void *)tmpde+slop, bh->b_data, offset); 1257 } 1258 de = tmpde; 1259 } 1260 1261 inode->i_size += isonum_733(de->size); 1262 if (i == 1) { 1263 ei->i_next_section_block = block_saved; 1264 ei->i_next_section_offset = offset_saved; 1265 } 1266 1267 more_entries = de->flags[-high_sierra] & 0x80; 1268 1269 i++; 1270 if (i > 100) 1271 goto out_toomany; 1272 } while (more_entries); 1273 out: 1274 kfree(tmpde); 1275 if (bh) 1276 brelse(bh); 1277 return 0; 1278 1279 out_nomem: 1280 if (bh) 1281 brelse(bh); 1282 return -ENOMEM; 1283 1284 out_noread: 1285 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1286 kfree(tmpde); 1287 return -EIO; 1288 1289 out_toomany: 1290 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1291 "isofs_read_level3_size: inode=%lu\n", 1292 __func__, inode->i_ino); 1293 goto out; 1294 } 1295 1296 static int isofs_read_inode(struct inode *inode, int relocated) 1297 { 1298 struct super_block *sb = inode->i_sb; 1299 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1300 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1301 unsigned long block; 1302 int high_sierra = sbi->s_high_sierra; 1303 struct buffer_head *bh; 1304 struct iso_directory_record *de; 1305 struct iso_directory_record *tmpde = NULL; 1306 unsigned int de_len; 1307 unsigned long offset; 1308 struct iso_inode_info *ei = ISOFS_I(inode); 1309 int ret = -EIO; 1310 1311 block = ei->i_iget5_block; 1312 bh = sb_bread(inode->i_sb, block); 1313 if (!bh) 1314 goto out_badread; 1315 1316 offset = ei->i_iget5_offset; 1317 1318 de = (struct iso_directory_record *) (bh->b_data + offset); 1319 de_len = *(unsigned char *) de; 1320 1321 if (offset + de_len > bufsize) { 1322 int frag1 = bufsize - offset; 1323 1324 tmpde = kmalloc(de_len, GFP_KERNEL); 1325 if (!tmpde) { 1326 ret = -ENOMEM; 1327 goto fail; 1328 } 1329 memcpy(tmpde, bh->b_data + offset, frag1); 1330 brelse(bh); 1331 bh = sb_bread(inode->i_sb, ++block); 1332 if (!bh) 1333 goto out_badread; 1334 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1335 de = tmpde; 1336 } 1337 1338 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1339 ei->i_iget5_offset, 1340 ISOFS_BUFFER_BITS(inode)); 1341 1342 /* Assume it is a normal-format file unless told otherwise */ 1343 ei->i_file_format = isofs_file_normal; 1344 1345 if (de->flags[-high_sierra] & 2) { 1346 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1347 inode->i_mode = S_IFDIR | sbi->s_dmode; 1348 else 1349 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1350 set_nlink(inode, 1); /* 1351 * Set to 1. We know there are 2, but 1352 * the find utility tries to optimize 1353 * if it is 2, and it screws up. It is 1354 * easier to give 1 which tells find to 1355 * do it the hard way. 1356 */ 1357 } else { 1358 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1359 inode->i_mode = S_IFREG | sbi->s_fmode; 1360 } else { 1361 /* 1362 * Set default permissions: r-x for all. The disc 1363 * could be shared with DOS machines so virtually 1364 * anything could be a valid executable. 1365 */ 1366 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1367 } 1368 set_nlink(inode, 1); 1369 } 1370 inode->i_uid = sbi->s_uid; 1371 inode->i_gid = sbi->s_gid; 1372 inode->i_blocks = 0; 1373 1374 ei->i_format_parm[0] = 0; 1375 ei->i_format_parm[1] = 0; 1376 ei->i_format_parm[2] = 0; 1377 1378 ei->i_section_size = isonum_733(de->size); 1379 if (de->flags[-high_sierra] & 0x80) { 1380 ret = isofs_read_level3_size(inode); 1381 if (ret < 0) 1382 goto fail; 1383 ret = -EIO; 1384 } else { 1385 ei->i_next_section_block = 0; 1386 ei->i_next_section_offset = 0; 1387 inode->i_size = isonum_733(de->size); 1388 } 1389 1390 /* 1391 * Some dipshit decided to store some other bit of information 1392 * in the high byte of the file length. Truncate size in case 1393 * this CDROM was mounted with the cruft option. 1394 */ 1395 1396 if (sbi->s_cruft) 1397 inode->i_size &= 0x00ffffff; 1398 1399 if (de->interleave[0]) { 1400 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1401 inode->i_size = 0; 1402 } 1403 1404 /* I have no idea what file_unit_size is used for, so 1405 we will flag it for now */ 1406 if (de->file_unit_size[0] != 0) { 1407 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1408 inode->i_ino); 1409 } 1410 1411 /* I have no idea what other flag bits are used for, so 1412 we will flag it for now */ 1413 #ifdef DEBUG 1414 if((de->flags[-high_sierra] & ~2)!= 0){ 1415 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1416 "(%ld %x).\n", 1417 inode->i_ino, de->flags[-high_sierra]); 1418 } 1419 #endif 1420 1421 inode->i_mtime.tv_sec = 1422 inode->i_atime.tv_sec = 1423 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1424 inode->i_mtime.tv_nsec = 1425 inode->i_atime.tv_nsec = 1426 inode->i_ctime.tv_nsec = 0; 1427 1428 ei->i_first_extent = (isonum_733(de->extent) + 1429 isonum_711(de->ext_attr_length)); 1430 1431 /* Set the number of blocks for stat() - should be done before RR */ 1432 inode->i_blocks = (inode->i_size + 511) >> 9; 1433 1434 /* 1435 * Now test for possible Rock Ridge extensions which will override 1436 * some of these numbers in the inode structure. 1437 */ 1438 1439 if (!high_sierra) { 1440 parse_rock_ridge_inode(de, inode, relocated); 1441 /* if we want uid/gid set, override the rock ridge setting */ 1442 if (sbi->s_uid_set) 1443 inode->i_uid = sbi->s_uid; 1444 if (sbi->s_gid_set) 1445 inode->i_gid = sbi->s_gid; 1446 } 1447 /* Now set final access rights if overriding rock ridge setting */ 1448 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1449 sbi->s_dmode != ISOFS_INVALID_MODE) 1450 inode->i_mode = S_IFDIR | sbi->s_dmode; 1451 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1452 sbi->s_fmode != ISOFS_INVALID_MODE) 1453 inode->i_mode = S_IFREG | sbi->s_fmode; 1454 1455 /* Install the inode operations vector */ 1456 if (S_ISREG(inode->i_mode)) { 1457 inode->i_fop = &generic_ro_fops; 1458 switch (ei->i_file_format) { 1459 #ifdef CONFIG_ZISOFS 1460 case isofs_file_compressed: 1461 inode->i_data.a_ops = &zisofs_aops; 1462 break; 1463 #endif 1464 default: 1465 inode->i_data.a_ops = &isofs_aops; 1466 break; 1467 } 1468 } else if (S_ISDIR(inode->i_mode)) { 1469 inode->i_op = &isofs_dir_inode_operations; 1470 inode->i_fop = &isofs_dir_operations; 1471 } else if (S_ISLNK(inode->i_mode)) { 1472 inode->i_op = &page_symlink_inode_operations; 1473 inode_nohighmem(inode); 1474 inode->i_data.a_ops = &isofs_symlink_aops; 1475 } else 1476 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1477 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1478 1479 ret = 0; 1480 out: 1481 kfree(tmpde); 1482 if (bh) 1483 brelse(bh); 1484 return ret; 1485 1486 out_badread: 1487 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1488 fail: 1489 goto out; 1490 } 1491 1492 struct isofs_iget5_callback_data { 1493 unsigned long block; 1494 unsigned long offset; 1495 }; 1496 1497 static int isofs_iget5_test(struct inode *ino, void *data) 1498 { 1499 struct iso_inode_info *i = ISOFS_I(ino); 1500 struct isofs_iget5_callback_data *d = 1501 (struct isofs_iget5_callback_data*)data; 1502 return (i->i_iget5_block == d->block) 1503 && (i->i_iget5_offset == d->offset); 1504 } 1505 1506 static int isofs_iget5_set(struct inode *ino, void *data) 1507 { 1508 struct iso_inode_info *i = ISOFS_I(ino); 1509 struct isofs_iget5_callback_data *d = 1510 (struct isofs_iget5_callback_data*)data; 1511 i->i_iget5_block = d->block; 1512 i->i_iget5_offset = d->offset; 1513 return 0; 1514 } 1515 1516 /* Store, in the inode's containing structure, the block and block 1517 * offset that point to the underlying meta-data for the inode. The 1518 * code below is otherwise similar to the iget() code in 1519 * include/linux/fs.h */ 1520 struct inode *__isofs_iget(struct super_block *sb, 1521 unsigned long block, 1522 unsigned long offset, 1523 int relocated) 1524 { 1525 unsigned long hashval; 1526 struct inode *inode; 1527 struct isofs_iget5_callback_data data; 1528 long ret; 1529 1530 if (offset >= 1ul << sb->s_blocksize_bits) 1531 return ERR_PTR(-EINVAL); 1532 1533 data.block = block; 1534 data.offset = offset; 1535 1536 hashval = (block << sb->s_blocksize_bits) | offset; 1537 1538 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1539 &isofs_iget5_set, &data); 1540 1541 if (!inode) 1542 return ERR_PTR(-ENOMEM); 1543 1544 if (inode->i_state & I_NEW) { 1545 ret = isofs_read_inode(inode, relocated); 1546 if (ret < 0) { 1547 iget_failed(inode); 1548 inode = ERR_PTR(ret); 1549 } else { 1550 unlock_new_inode(inode); 1551 } 1552 } 1553 1554 return inode; 1555 } 1556 1557 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1558 int flags, const char *dev_name, void *data) 1559 { 1560 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1561 } 1562 1563 static struct file_system_type iso9660_fs_type = { 1564 .owner = THIS_MODULE, 1565 .name = "iso9660", 1566 .mount = isofs_mount, 1567 .kill_sb = kill_block_super, 1568 .fs_flags = FS_REQUIRES_DEV, 1569 }; 1570 MODULE_ALIAS_FS("iso9660"); 1571 MODULE_ALIAS("iso9660"); 1572 1573 static int __init init_iso9660_fs(void) 1574 { 1575 int err = init_inodecache(); 1576 if (err) 1577 goto out; 1578 #ifdef CONFIG_ZISOFS 1579 err = zisofs_init(); 1580 if (err) 1581 goto out1; 1582 #endif 1583 err = register_filesystem(&iso9660_fs_type); 1584 if (err) 1585 goto out2; 1586 return 0; 1587 out2: 1588 #ifdef CONFIG_ZISOFS 1589 zisofs_cleanup(); 1590 out1: 1591 #endif 1592 destroy_inodecache(); 1593 out: 1594 return err; 1595 } 1596 1597 static void __exit exit_iso9660_fs(void) 1598 { 1599 unregister_filesystem(&iso9660_fs_type); 1600 #ifdef CONFIG_ZISOFS 1601 zisofs_cleanup(); 1602 #endif 1603 destroy_inodecache(); 1604 } 1605 1606 module_init(init_iso9660_fs) 1607 module_exit(exit_iso9660_fs) 1608 MODULE_LICENSE("GPL"); 1609