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_free_inode(struct inode *inode) 76 { 77 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 78 } 79 80 static void init_once(void *foo) 81 { 82 struct iso_inode_info *ei = foo; 83 84 inode_init_once(&ei->vfs_inode); 85 } 86 87 static int __init init_inodecache(void) 88 { 89 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", 90 sizeof(struct iso_inode_info), 91 0, (SLAB_RECLAIM_ACCOUNT| 92 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 93 init_once); 94 if (!isofs_inode_cachep) 95 return -ENOMEM; 96 return 0; 97 } 98 99 static void destroy_inodecache(void) 100 { 101 /* 102 * Make sure all delayed rcu free inodes are flushed before we 103 * destroy cache. 104 */ 105 rcu_barrier(); 106 kmem_cache_destroy(isofs_inode_cachep); 107 } 108 109 static int isofs_remount(struct super_block *sb, int *flags, char *data) 110 { 111 sync_filesystem(sb); 112 if (!(*flags & SB_RDONLY)) 113 return -EROFS; 114 return 0; 115 } 116 117 static const struct super_operations isofs_sops = { 118 .alloc_inode = isofs_alloc_inode, 119 .free_inode = isofs_free_inode, 120 .put_super = isofs_put_super, 121 .statfs = isofs_statfs, 122 .remount_fs = isofs_remount, 123 .show_options = isofs_show_options, 124 }; 125 126 127 static const struct dentry_operations isofs_dentry_ops[] = { 128 { 129 .d_hash = isofs_hashi, 130 .d_compare = isofs_dentry_cmpi, 131 }, 132 #ifdef CONFIG_JOLIET 133 { 134 .d_hash = isofs_hash_ms, 135 .d_compare = isofs_dentry_cmp_ms, 136 }, 137 { 138 .d_hash = isofs_hashi_ms, 139 .d_compare = isofs_dentry_cmpi_ms, 140 }, 141 #endif 142 }; 143 144 struct iso9660_options{ 145 unsigned int rock:1; 146 unsigned int joliet:1; 147 unsigned int cruft:1; 148 unsigned int hide:1; 149 unsigned int showassoc:1; 150 unsigned int nocompress:1; 151 unsigned int overriderockperm:1; 152 unsigned int uid_set:1; 153 unsigned int gid_set:1; 154 unsigned int utf8:1; 155 unsigned char map; 156 unsigned char check; 157 unsigned int blocksize; 158 umode_t fmode; 159 umode_t dmode; 160 kgid_t gid; 161 kuid_t uid; 162 char *iocharset; 163 /* LVE */ 164 s32 session; 165 s32 sbsector; 166 }; 167 168 /* 169 * Compute the hash for the isofs name corresponding to the dentry. 170 */ 171 static int 172 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) 173 { 174 const char *name; 175 int len; 176 char c; 177 unsigned long hash; 178 179 len = qstr->len; 180 name = qstr->name; 181 if (ms) { 182 while (len && name[len-1] == '.') 183 len--; 184 } 185 186 hash = init_name_hash(dentry); 187 while (len--) { 188 c = tolower(*name++); 189 hash = partial_name_hash(c, hash); 190 } 191 qstr->hash = end_name_hash(hash); 192 193 return 0; 194 } 195 196 /* 197 * Compare of two isofs names. 198 */ 199 static int isofs_dentry_cmp_common( 200 unsigned int len, const char *str, 201 const struct qstr *name, int ms, int ci) 202 { 203 int alen, blen; 204 205 /* A filename cannot end in '.' or we treat it like it has none */ 206 alen = name->len; 207 blen = len; 208 if (ms) { 209 while (alen && name->name[alen-1] == '.') 210 alen--; 211 while (blen && str[blen-1] == '.') 212 blen--; 213 } 214 if (alen == blen) { 215 if (ci) { 216 if (strncasecmp(name->name, str, alen) == 0) 217 return 0; 218 } else { 219 if (strncmp(name->name, str, alen) == 0) 220 return 0; 221 } 222 } 223 return 1; 224 } 225 226 static int 227 isofs_hashi(const struct dentry *dentry, struct qstr *qstr) 228 { 229 return isofs_hashi_common(dentry, qstr, 0); 230 } 231 232 static int 233 isofs_dentry_cmpi(const struct dentry *dentry, 234 unsigned int len, const char *str, const struct qstr *name) 235 { 236 return isofs_dentry_cmp_common(len, str, name, 0, 1); 237 } 238 239 #ifdef CONFIG_JOLIET 240 /* 241 * Compute the hash for the isofs name corresponding to the dentry. 242 */ 243 static int 244 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) 245 { 246 const char *name; 247 int len; 248 249 len = qstr->len; 250 name = qstr->name; 251 if (ms) { 252 while (len && name[len-1] == '.') 253 len--; 254 } 255 256 qstr->hash = full_name_hash(dentry, name, len); 257 258 return 0; 259 } 260 261 static int 262 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) 263 { 264 return isofs_hash_common(dentry, qstr, 1); 265 } 266 267 static int 268 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) 269 { 270 return isofs_hashi_common(dentry, qstr, 1); 271 } 272 273 static int 274 isofs_dentry_cmp_ms(const struct dentry *dentry, 275 unsigned int len, const char *str, const struct qstr *name) 276 { 277 return isofs_dentry_cmp_common(len, str, name, 1, 0); 278 } 279 280 static int 281 isofs_dentry_cmpi_ms(const struct dentry *dentry, 282 unsigned int len, const char *str, const struct qstr *name) 283 { 284 return isofs_dentry_cmp_common(len, str, name, 1, 1); 285 } 286 #endif 287 288 enum { 289 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, 290 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, 291 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, 292 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, 293 }; 294 295 static const match_table_t tokens = { 296 {Opt_norock, "norock"}, 297 {Opt_nojoliet, "nojoliet"}, 298 {Opt_unhide, "unhide"}, 299 {Opt_hide, "hide"}, 300 {Opt_showassoc, "showassoc"}, 301 {Opt_cruft, "cruft"}, 302 {Opt_utf8, "utf8"}, 303 {Opt_iocharset, "iocharset=%s"}, 304 {Opt_map_a, "map=acorn"}, 305 {Opt_map_a, "map=a"}, 306 {Opt_map_n, "map=normal"}, 307 {Opt_map_n, "map=n"}, 308 {Opt_map_o, "map=off"}, 309 {Opt_map_o, "map=o"}, 310 {Opt_session, "session=%u"}, 311 {Opt_sb, "sbsector=%u"}, 312 {Opt_check_r, "check=relaxed"}, 313 {Opt_check_r, "check=r"}, 314 {Opt_check_s, "check=strict"}, 315 {Opt_check_s, "check=s"}, 316 {Opt_uid, "uid=%u"}, 317 {Opt_gid, "gid=%u"}, 318 {Opt_mode, "mode=%u"}, 319 {Opt_dmode, "dmode=%u"}, 320 {Opt_overriderockperm, "overriderockperm"}, 321 {Opt_block, "block=%u"}, 322 {Opt_ignore, "conv=binary"}, 323 {Opt_ignore, "conv=b"}, 324 {Opt_ignore, "conv=text"}, 325 {Opt_ignore, "conv=t"}, 326 {Opt_ignore, "conv=mtext"}, 327 {Opt_ignore, "conv=m"}, 328 {Opt_ignore, "conv=auto"}, 329 {Opt_ignore, "conv=a"}, 330 {Opt_nocompress, "nocompress"}, 331 {Opt_err, NULL} 332 }; 333 334 static int parse_options(char *options, struct iso9660_options *popt) 335 { 336 char *p; 337 int option; 338 339 popt->map = 'n'; 340 popt->rock = 1; 341 popt->joliet = 1; 342 popt->cruft = 0; 343 popt->hide = 0; 344 popt->showassoc = 0; 345 popt->check = 'u'; /* unset */ 346 popt->nocompress = 0; 347 popt->blocksize = 1024; 348 popt->fmode = popt->dmode = ISOFS_INVALID_MODE; 349 popt->uid_set = 0; 350 popt->gid_set = 0; 351 popt->gid = GLOBAL_ROOT_GID; 352 popt->uid = GLOBAL_ROOT_UID; 353 popt->iocharset = NULL; 354 popt->utf8 = 0; 355 popt->overriderockperm = 0; 356 popt->session=-1; 357 popt->sbsector=-1; 358 if (!options) 359 return 1; 360 361 while ((p = strsep(&options, ",")) != NULL) { 362 int token; 363 substring_t args[MAX_OPT_ARGS]; 364 unsigned n; 365 366 if (!*p) 367 continue; 368 369 token = match_token(p, tokens, args); 370 switch (token) { 371 case Opt_norock: 372 popt->rock = 0; 373 break; 374 case Opt_nojoliet: 375 popt->joliet = 0; 376 break; 377 case Opt_hide: 378 popt->hide = 1; 379 break; 380 case Opt_unhide: 381 case Opt_showassoc: 382 popt->showassoc = 1; 383 break; 384 case Opt_cruft: 385 popt->cruft = 1; 386 break; 387 case Opt_utf8: 388 popt->utf8 = 1; 389 break; 390 #ifdef CONFIG_JOLIET 391 case Opt_iocharset: 392 kfree(popt->iocharset); 393 popt->iocharset = match_strdup(&args[0]); 394 if (!popt->iocharset) 395 return 0; 396 break; 397 #endif 398 case Opt_map_a: 399 popt->map = 'a'; 400 break; 401 case Opt_map_o: 402 popt->map = 'o'; 403 break; 404 case Opt_map_n: 405 popt->map = 'n'; 406 break; 407 case Opt_session: 408 if (match_int(&args[0], &option)) 409 return 0; 410 n = option; 411 /* 412 * Track numbers are supposed to be in range 1-99, the 413 * mount option starts indexing at 0. 414 */ 415 if (n >= 99) 416 return 0; 417 popt->session = n + 1; 418 break; 419 case Opt_sb: 420 if (match_int(&args[0], &option)) 421 return 0; 422 popt->sbsector = option; 423 break; 424 case Opt_check_r: 425 popt->check = 'r'; 426 break; 427 case Opt_check_s: 428 popt->check = 's'; 429 break; 430 case Opt_ignore: 431 break; 432 case Opt_uid: 433 if (match_int(&args[0], &option)) 434 return 0; 435 popt->uid = make_kuid(current_user_ns(), option); 436 if (!uid_valid(popt->uid)) 437 return 0; 438 popt->uid_set = 1; 439 break; 440 case Opt_gid: 441 if (match_int(&args[0], &option)) 442 return 0; 443 popt->gid = make_kgid(current_user_ns(), option); 444 if (!gid_valid(popt->gid)) 445 return 0; 446 popt->gid_set = 1; 447 break; 448 case Opt_mode: 449 if (match_int(&args[0], &option)) 450 return 0; 451 popt->fmode = option; 452 break; 453 case Opt_dmode: 454 if (match_int(&args[0], &option)) 455 return 0; 456 popt->dmode = option; 457 break; 458 case Opt_overriderockperm: 459 popt->overriderockperm = 1; 460 break; 461 case Opt_block: 462 if (match_int(&args[0], &option)) 463 return 0; 464 n = option; 465 if (n != 512 && n != 1024 && n != 2048) 466 return 0; 467 popt->blocksize = n; 468 break; 469 case Opt_nocompress: 470 popt->nocompress = 1; 471 break; 472 default: 473 return 0; 474 } 475 } 476 return 1; 477 } 478 479 /* 480 * Display the mount options in /proc/mounts. 481 */ 482 static int isofs_show_options(struct seq_file *m, struct dentry *root) 483 { 484 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 485 486 if (!sbi->s_rock) seq_puts(m, ",norock"); 487 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 488 if (sbi->s_cruft) seq_puts(m, ",cruft"); 489 if (sbi->s_hide) seq_puts(m, ",hide"); 490 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 491 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 492 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 493 if (sbi->s_utf8) seq_puts(m, ",utf8"); 494 495 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 496 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 497 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 498 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 499 500 if (root->d_sb->s_blocksize != 1024) 501 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 502 503 if (sbi->s_uid_set) 504 seq_printf(m, ",uid=%u", 505 from_kuid_munged(&init_user_ns, sbi->s_uid)); 506 if (sbi->s_gid_set) 507 seq_printf(m, ",gid=%u", 508 from_kgid_munged(&init_user_ns, sbi->s_gid)); 509 510 if (sbi->s_dmode != ISOFS_INVALID_MODE) 511 seq_printf(m, ",dmode=%o", sbi->s_dmode); 512 if (sbi->s_fmode != ISOFS_INVALID_MODE) 513 seq_printf(m, ",fmode=%o", sbi->s_fmode); 514 515 #ifdef CONFIG_JOLIET 516 if (sbi->s_nls_iocharset && 517 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) 518 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 519 #endif 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 if (bdev_logical_block_size(s->s_bdev) > 2048) { 652 printk(KERN_WARNING 653 "ISOFS: unsupported/invalid hardware sector size %d\n", 654 bdev_logical_block_size(s->s_bdev)); 655 goto out_freesbi; 656 } 657 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 658 659 sbi->s_high_sierra = 0; /* default is iso9660 */ 660 sbi->s_session = opt.session; 661 sbi->s_sbsector = opt.sbsector; 662 663 vol_desc_start = (opt.sbsector != -1) ? 664 opt.sbsector : isofs_get_last_session(s,opt.session); 665 666 for (iso_blknum = vol_desc_start+16; 667 iso_blknum < vol_desc_start+100; iso_blknum++) { 668 struct hs_volume_descriptor *hdp; 669 struct iso_volume_descriptor *vdp; 670 671 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 672 if (!(bh = sb_bread(s, block))) 673 goto out_no_read; 674 675 vdp = (struct iso_volume_descriptor *)bh->b_data; 676 hdp = (struct hs_volume_descriptor *)bh->b_data; 677 678 /* 679 * Due to the overlapping physical location of the descriptors, 680 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 681 * proper identification in this case, we first check for ISO. 682 */ 683 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 684 if (isonum_711(vdp->type) == ISO_VD_END) 685 break; 686 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 687 if (!pri) { 688 pri = (struct iso_primary_descriptor *)vdp; 689 /* Save the buffer in case we need it ... */ 690 pri_bh = bh; 691 bh = NULL; 692 } 693 } 694 #ifdef CONFIG_JOLIET 695 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 696 sec = (struct iso_supplementary_descriptor *)vdp; 697 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 698 if (opt.joliet) { 699 if (sec->escape[2] == 0x40) 700 joliet_level = 1; 701 else if (sec->escape[2] == 0x43) 702 joliet_level = 2; 703 else if (sec->escape[2] == 0x45) 704 joliet_level = 3; 705 706 printk(KERN_DEBUG "ISO 9660 Extensions: " 707 "Microsoft Joliet Level %d\n", 708 joliet_level); 709 } 710 goto root_found; 711 } else { 712 /* Unknown supplementary volume descriptor */ 713 sec = NULL; 714 } 715 } 716 #endif 717 } else { 718 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 719 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 720 goto out_freebh; 721 722 sbi->s_high_sierra = 1; 723 opt.rock = 0; 724 h_pri = (struct hs_primary_descriptor *)vdp; 725 goto root_found; 726 } 727 } 728 729 /* Just skip any volume descriptors we don't recognize */ 730 731 brelse(bh); 732 bh = NULL; 733 } 734 /* 735 * If we fall through, either no volume descriptor was found, 736 * or else we passed a primary descriptor looking for others. 737 */ 738 if (!pri) 739 goto out_unknown_format; 740 brelse(bh); 741 bh = pri_bh; 742 pri_bh = NULL; 743 744 root_found: 745 /* We don't support read-write mounts */ 746 if (!sb_rdonly(s)) { 747 error = -EACCES; 748 goto out_freebh; 749 } 750 751 if (joliet_level && (!pri || !opt.rock)) { 752 /* This is the case of Joliet with the norock mount flag. 753 * A disc with both Joliet and Rock Ridge is handled later 754 */ 755 pri = (struct iso_primary_descriptor *) sec; 756 } 757 758 if(sbi->s_high_sierra){ 759 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 760 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 761 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 762 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 763 } else { 764 if (!pri) 765 goto out_freebh; 766 rootp = (struct iso_directory_record *) pri->root_directory_record; 767 sbi->s_nzones = isonum_733(pri->volume_space_size); 768 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 769 sbi->s_max_size = isonum_733(pri->volume_space_size); 770 } 771 772 sbi->s_ninodes = 0; /* No way to figure this out easily */ 773 774 orig_zonesize = sbi->s_log_zone_size; 775 /* 776 * If the zone size is smaller than the hardware sector size, 777 * this is a fatal error. This would occur if the disc drive 778 * had sectors that were 2048 bytes, but the filesystem had 779 * blocks that were 512 bytes (which should only very rarely 780 * happen.) 781 */ 782 if (orig_zonesize < opt.blocksize) 783 goto out_bad_size; 784 785 /* RDE: convert log zone size to bit shift */ 786 switch (sbi->s_log_zone_size) { 787 case 512: sbi->s_log_zone_size = 9; break; 788 case 1024: sbi->s_log_zone_size = 10; break; 789 case 2048: sbi->s_log_zone_size = 11; break; 790 791 default: 792 goto out_bad_zone_size; 793 } 794 795 s->s_magic = ISOFS_SUPER_MAGIC; 796 797 /* 798 * With multi-extent files, file size is only limited by the maximum 799 * size of a file system, which is 8 TB. 800 */ 801 s->s_maxbytes = 0x80000000000LL; 802 803 /* Set this for reference. Its not currently used except on write 804 which we don't have .. */ 805 806 first_data_zone = isonum_733(rootp->extent) + 807 isonum_711(rootp->ext_attr_length); 808 sbi->s_firstdatazone = first_data_zone; 809 #ifndef BEQUIET 810 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 811 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 812 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 813 if(sbi->s_high_sierra) 814 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 815 #endif 816 817 /* 818 * If the Joliet level is set, we _may_ decide to use the 819 * secondary descriptor, but can't be sure until after we 820 * read the root inode. But before reading the root inode 821 * we may need to change the device blocksize, and would 822 * rather release the old buffer first. So, we cache the 823 * first_data_zone value from the secondary descriptor. 824 */ 825 if (joliet_level) { 826 pri = (struct iso_primary_descriptor *) sec; 827 rootp = (struct iso_directory_record *) 828 pri->root_directory_record; 829 first_data_zone = isonum_733(rootp->extent) + 830 isonum_711(rootp->ext_attr_length); 831 } 832 833 /* 834 * We're all done using the volume descriptor, and may need 835 * to change the device blocksize, so release the buffer now. 836 */ 837 brelse(pri_bh); 838 brelse(bh); 839 840 /* 841 * Force the blocksize to 512 for 512 byte sectors. The file 842 * read primitives really get it wrong in a bad way if we don't 843 * do this. 844 * 845 * Note - we should never be setting the blocksize to something 846 * less than the hardware sector size for the device. If we 847 * do, we would end up having to read larger buffers and split 848 * out portions to satisfy requests. 849 * 850 * Note2- the idea here is that we want to deal with the optimal 851 * zonesize in the filesystem. If we have it set to something less, 852 * then we have horrible problems with trying to piece together 853 * bits of adjacent blocks in order to properly read directory 854 * entries. By forcing the blocksize in this way, we ensure 855 * that we will never be required to do this. 856 */ 857 sb_set_blocksize(s, orig_zonesize); 858 859 sbi->s_nls_iocharset = NULL; 860 861 #ifdef CONFIG_JOLIET 862 if (joliet_level && opt.utf8 == 0) { 863 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 864 sbi->s_nls_iocharset = load_nls(p); 865 if (! sbi->s_nls_iocharset) { 866 /* Fail only if explicit charset specified */ 867 if (opt.iocharset) 868 goto out_freesbi; 869 sbi->s_nls_iocharset = load_nls_default(); 870 } 871 } 872 #endif 873 s->s_op = &isofs_sops; 874 s->s_export_op = &isofs_export_ops; 875 sbi->s_mapping = opt.map; 876 sbi->s_rock = (opt.rock ? 2 : 0); 877 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 878 sbi->s_cruft = opt.cruft; 879 sbi->s_hide = opt.hide; 880 sbi->s_showassoc = opt.showassoc; 881 sbi->s_uid = opt.uid; 882 sbi->s_gid = opt.gid; 883 sbi->s_uid_set = opt.uid_set; 884 sbi->s_gid_set = opt.gid_set; 885 sbi->s_utf8 = opt.utf8; 886 sbi->s_nocompress = opt.nocompress; 887 sbi->s_overriderockperm = opt.overriderockperm; 888 /* 889 * It would be incredibly stupid to allow people to mark every file 890 * on the disk as suid, so we merely allow them to set the default 891 * permissions. 892 */ 893 if (opt.fmode != ISOFS_INVALID_MODE) 894 sbi->s_fmode = opt.fmode & 0777; 895 else 896 sbi->s_fmode = ISOFS_INVALID_MODE; 897 if (opt.dmode != ISOFS_INVALID_MODE) 898 sbi->s_dmode = opt.dmode & 0777; 899 else 900 sbi->s_dmode = ISOFS_INVALID_MODE; 901 902 /* 903 * Read the root inode, which _may_ result in changing 904 * the s_rock flag. Once we have the final s_rock value, 905 * we then decide whether to use the Joliet descriptor. 906 */ 907 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 908 if (IS_ERR(inode)) 909 goto out_no_root; 910 911 /* 912 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 913 * correct Joliet root directory. 914 */ 915 if (sbi->s_rock == 1 && joliet_level && 916 rootdir_empty(s, sbi->s_firstdatazone)) { 917 printk(KERN_NOTICE 918 "ISOFS: primary root directory is empty. " 919 "Disabling Rock Ridge and switching to Joliet."); 920 sbi->s_rock = 0; 921 } 922 923 /* 924 * If this disk has both Rock Ridge and Joliet on it, then we 925 * want to use Rock Ridge by default. This can be overridden 926 * by using the norock mount option. There is still one other 927 * possibility that is not taken into account: a Rock Ridge 928 * CD with Unicode names. Until someone sees such a beast, it 929 * will not be supported. 930 */ 931 if (sbi->s_rock == 1) { 932 joliet_level = 0; 933 } else if (joliet_level) { 934 sbi->s_rock = 0; 935 if (sbi->s_firstdatazone != first_data_zone) { 936 sbi->s_firstdatazone = first_data_zone; 937 printk(KERN_DEBUG 938 "ISOFS: changing to secondary root\n"); 939 iput(inode); 940 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 941 if (IS_ERR(inode)) 942 goto out_no_root; 943 } 944 } 945 946 if (opt.check == 'u') { 947 /* Only Joliet is case insensitive by default */ 948 if (joliet_level) 949 opt.check = 'r'; 950 else 951 opt.check = 's'; 952 } 953 sbi->s_joliet_level = joliet_level; 954 955 /* Make sure the root inode is a directory */ 956 if (!S_ISDIR(inode->i_mode)) { 957 printk(KERN_WARNING 958 "isofs_fill_super: root inode is not a directory. " 959 "Corrupted media?\n"); 960 goto out_iput; 961 } 962 963 table = 0; 964 if (joliet_level) 965 table += 2; 966 if (opt.check == 'r') 967 table++; 968 sbi->s_check = opt.check; 969 970 if (table) 971 s->s_d_op = &isofs_dentry_ops[table - 1]; 972 973 /* get the root dentry */ 974 s->s_root = d_make_root(inode); 975 if (!(s->s_root)) { 976 error = -ENOMEM; 977 goto out_no_inode; 978 } 979 980 kfree(opt.iocharset); 981 982 return 0; 983 984 /* 985 * Display error messages and free resources. 986 */ 987 out_iput: 988 iput(inode); 989 goto out_no_inode; 990 out_no_root: 991 error = PTR_ERR(inode); 992 if (error != -ENOMEM) 993 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 994 out_no_inode: 995 #ifdef CONFIG_JOLIET 996 unload_nls(sbi->s_nls_iocharset); 997 #endif 998 goto out_freesbi; 999 out_no_read: 1000 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 1001 __func__, s->s_id, iso_blknum, block); 1002 goto out_freebh; 1003 out_bad_zone_size: 1004 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 1005 sbi->s_log_zone_size); 1006 goto out_freebh; 1007 out_bad_size: 1008 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 1009 orig_zonesize, opt.blocksize); 1010 goto out_freebh; 1011 out_unknown_format: 1012 if (!silent) 1013 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1014 1015 out_freebh: 1016 brelse(bh); 1017 brelse(pri_bh); 1018 out_freesbi: 1019 kfree(opt.iocharset); 1020 kfree(sbi); 1021 s->s_fs_info = NULL; 1022 return error; 1023 } 1024 1025 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1026 { 1027 struct super_block *sb = dentry->d_sb; 1028 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1029 1030 buf->f_type = ISOFS_SUPER_MAGIC; 1031 buf->f_bsize = sb->s_blocksize; 1032 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1033 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1034 buf->f_bfree = 0; 1035 buf->f_bavail = 0; 1036 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1037 buf->f_ffree = 0; 1038 buf->f_fsid.val[0] = (u32)id; 1039 buf->f_fsid.val[1] = (u32)(id >> 32); 1040 buf->f_namelen = NAME_MAX; 1041 return 0; 1042 } 1043 1044 /* 1045 * Get a set of blocks; filling in buffer_heads if already allocated 1046 * or getblk() if they are not. Returns the number of blocks inserted 1047 * (-ve == error.) 1048 */ 1049 int isofs_get_blocks(struct inode *inode, sector_t iblock, 1050 struct buffer_head **bh, unsigned long nblocks) 1051 { 1052 unsigned long b_off = iblock; 1053 unsigned offset, sect_size; 1054 unsigned int firstext; 1055 unsigned long nextblk, nextoff; 1056 int section, rv, error; 1057 struct iso_inode_info *ei = ISOFS_I(inode); 1058 1059 error = -EIO; 1060 rv = 0; 1061 if (iblock != b_off) { 1062 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1063 goto abort; 1064 } 1065 1066 1067 offset = 0; 1068 firstext = ei->i_first_extent; 1069 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1070 nextblk = ei->i_next_section_block; 1071 nextoff = ei->i_next_section_offset; 1072 section = 0; 1073 1074 while (nblocks) { 1075 /* If we are *way* beyond the end of the file, print a message. 1076 * Access beyond the end of the file up to the next page boundary 1077 * is normal, however because of the way the page cache works. 1078 * In this case, we just return 0 so that we can properly fill 1079 * the page with useless information without generating any 1080 * I/O errors. 1081 */ 1082 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1083 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1084 __func__, b_off, 1085 (unsigned long long)inode->i_size); 1086 goto abort; 1087 } 1088 1089 /* On the last section, nextblk == 0, section size is likely to 1090 * exceed sect_size by a partial block, and access beyond the 1091 * end of the file will reach beyond the section size, too. 1092 */ 1093 while (nextblk && (b_off >= (offset + sect_size))) { 1094 struct inode *ninode; 1095 1096 offset += sect_size; 1097 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1098 if (IS_ERR(ninode)) { 1099 error = PTR_ERR(ninode); 1100 goto abort; 1101 } 1102 firstext = ISOFS_I(ninode)->i_first_extent; 1103 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1104 nextblk = ISOFS_I(ninode)->i_next_section_block; 1105 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1106 iput(ninode); 1107 1108 if (++section > 100) { 1109 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1110 " aborting...\n", __func__); 1111 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1112 "nextblk=%lu nextoff=%lu\n", __func__, 1113 b_off, firstext, (unsigned) sect_size, 1114 nextblk, nextoff); 1115 goto abort; 1116 } 1117 } 1118 1119 if (*bh) { 1120 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1121 } else { 1122 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1123 if (!*bh) 1124 goto abort; 1125 } 1126 bh++; /* Next buffer head */ 1127 b_off++; /* Next buffer offset */ 1128 nblocks--; 1129 rv++; 1130 } 1131 1132 error = 0; 1133 abort: 1134 return rv != 0 ? rv : error; 1135 } 1136 1137 /* 1138 * Used by the standard interfaces. 1139 */ 1140 static int isofs_get_block(struct inode *inode, sector_t iblock, 1141 struct buffer_head *bh_result, int create) 1142 { 1143 int ret; 1144 1145 if (create) { 1146 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1147 return -EROFS; 1148 } 1149 1150 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1151 return ret < 0 ? ret : 0; 1152 } 1153 1154 static int isofs_bmap(struct inode *inode, sector_t block) 1155 { 1156 struct buffer_head dummy; 1157 int error; 1158 1159 dummy.b_state = 0; 1160 dummy.b_blocknr = -1000; 1161 error = isofs_get_block(inode, block, &dummy, 0); 1162 if (!error) 1163 return dummy.b_blocknr; 1164 return 0; 1165 } 1166 1167 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1168 { 1169 sector_t blknr = isofs_bmap(inode, block); 1170 if (!blknr) 1171 return NULL; 1172 return sb_bread(inode->i_sb, blknr); 1173 } 1174 1175 static int isofs_readpage(struct file *file, struct page *page) 1176 { 1177 return mpage_readpage(page, isofs_get_block); 1178 } 1179 1180 static int isofs_readpages(struct file *file, struct address_space *mapping, 1181 struct list_head *pages, unsigned nr_pages) 1182 { 1183 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); 1184 } 1185 1186 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1187 { 1188 return generic_block_bmap(mapping,block,isofs_get_block); 1189 } 1190 1191 static const struct address_space_operations isofs_aops = { 1192 .readpage = isofs_readpage, 1193 .readpages = isofs_readpages, 1194 .bmap = _isofs_bmap 1195 }; 1196 1197 static int isofs_read_level3_size(struct inode *inode) 1198 { 1199 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1200 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1201 struct buffer_head *bh = NULL; 1202 unsigned long block, offset, block_saved, offset_saved; 1203 int i = 0; 1204 int more_entries = 0; 1205 struct iso_directory_record *tmpde = NULL; 1206 struct iso_inode_info *ei = ISOFS_I(inode); 1207 1208 inode->i_size = 0; 1209 1210 /* The first 16 blocks are reserved as the System Area. Thus, 1211 * no inodes can appear in block 0. We use this to flag that 1212 * this is the last section. */ 1213 ei->i_next_section_block = 0; 1214 ei->i_next_section_offset = 0; 1215 1216 block = ei->i_iget5_block; 1217 offset = ei->i_iget5_offset; 1218 1219 do { 1220 struct iso_directory_record *de; 1221 unsigned int de_len; 1222 1223 if (!bh) { 1224 bh = sb_bread(inode->i_sb, block); 1225 if (!bh) 1226 goto out_noread; 1227 } 1228 de = (struct iso_directory_record *) (bh->b_data + offset); 1229 de_len = *(unsigned char *) de; 1230 1231 if (de_len == 0) { 1232 brelse(bh); 1233 bh = NULL; 1234 ++block; 1235 offset = 0; 1236 continue; 1237 } 1238 1239 block_saved = block; 1240 offset_saved = offset; 1241 offset += de_len; 1242 1243 /* Make sure we have a full directory entry */ 1244 if (offset >= bufsize) { 1245 int slop = bufsize - offset + de_len; 1246 if (!tmpde) { 1247 tmpde = kmalloc(256, GFP_KERNEL); 1248 if (!tmpde) 1249 goto out_nomem; 1250 } 1251 memcpy(tmpde, de, slop); 1252 offset &= bufsize - 1; 1253 block++; 1254 brelse(bh); 1255 bh = NULL; 1256 if (offset) { 1257 bh = sb_bread(inode->i_sb, block); 1258 if (!bh) 1259 goto out_noread; 1260 memcpy((void *)tmpde+slop, bh->b_data, offset); 1261 } 1262 de = tmpde; 1263 } 1264 1265 inode->i_size += isonum_733(de->size); 1266 if (i == 1) { 1267 ei->i_next_section_block = block_saved; 1268 ei->i_next_section_offset = offset_saved; 1269 } 1270 1271 more_entries = de->flags[-high_sierra] & 0x80; 1272 1273 i++; 1274 if (i > 100) 1275 goto out_toomany; 1276 } while (more_entries); 1277 out: 1278 kfree(tmpde); 1279 if (bh) 1280 brelse(bh); 1281 return 0; 1282 1283 out_nomem: 1284 if (bh) 1285 brelse(bh); 1286 return -ENOMEM; 1287 1288 out_noread: 1289 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1290 kfree(tmpde); 1291 return -EIO; 1292 1293 out_toomany: 1294 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1295 "isofs_read_level3_size: inode=%lu\n", 1296 __func__, inode->i_ino); 1297 goto out; 1298 } 1299 1300 static int isofs_read_inode(struct inode *inode, int relocated) 1301 { 1302 struct super_block *sb = inode->i_sb; 1303 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1304 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1305 unsigned long block; 1306 int high_sierra = sbi->s_high_sierra; 1307 struct buffer_head *bh; 1308 struct iso_directory_record *de; 1309 struct iso_directory_record *tmpde = NULL; 1310 unsigned int de_len; 1311 unsigned long offset; 1312 struct iso_inode_info *ei = ISOFS_I(inode); 1313 int ret = -EIO; 1314 1315 block = ei->i_iget5_block; 1316 bh = sb_bread(inode->i_sb, block); 1317 if (!bh) 1318 goto out_badread; 1319 1320 offset = ei->i_iget5_offset; 1321 1322 de = (struct iso_directory_record *) (bh->b_data + offset); 1323 de_len = *(unsigned char *) de; 1324 1325 if (offset + de_len > bufsize) { 1326 int frag1 = bufsize - offset; 1327 1328 tmpde = kmalloc(de_len, GFP_KERNEL); 1329 if (!tmpde) { 1330 ret = -ENOMEM; 1331 goto fail; 1332 } 1333 memcpy(tmpde, bh->b_data + offset, frag1); 1334 brelse(bh); 1335 bh = sb_bread(inode->i_sb, ++block); 1336 if (!bh) 1337 goto out_badread; 1338 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1339 de = tmpde; 1340 } 1341 1342 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1343 ei->i_iget5_offset, 1344 ISOFS_BUFFER_BITS(inode)); 1345 1346 /* Assume it is a normal-format file unless told otherwise */ 1347 ei->i_file_format = isofs_file_normal; 1348 1349 if (de->flags[-high_sierra] & 2) { 1350 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1351 inode->i_mode = S_IFDIR | sbi->s_dmode; 1352 else 1353 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1354 set_nlink(inode, 1); /* 1355 * Set to 1. We know there are 2, but 1356 * the find utility tries to optimize 1357 * if it is 2, and it screws up. It is 1358 * easier to give 1 which tells find to 1359 * do it the hard way. 1360 */ 1361 } else { 1362 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1363 inode->i_mode = S_IFREG | sbi->s_fmode; 1364 } else { 1365 /* 1366 * Set default permissions: r-x for all. The disc 1367 * could be shared with DOS machines so virtually 1368 * anything could be a valid executable. 1369 */ 1370 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1371 } 1372 set_nlink(inode, 1); 1373 } 1374 inode->i_uid = sbi->s_uid; 1375 inode->i_gid = sbi->s_gid; 1376 inode->i_blocks = 0; 1377 1378 ei->i_format_parm[0] = 0; 1379 ei->i_format_parm[1] = 0; 1380 ei->i_format_parm[2] = 0; 1381 1382 ei->i_section_size = isonum_733(de->size); 1383 if (de->flags[-high_sierra] & 0x80) { 1384 ret = isofs_read_level3_size(inode); 1385 if (ret < 0) 1386 goto fail; 1387 ret = -EIO; 1388 } else { 1389 ei->i_next_section_block = 0; 1390 ei->i_next_section_offset = 0; 1391 inode->i_size = isonum_733(de->size); 1392 } 1393 1394 /* 1395 * Some dipshit decided to store some other bit of information 1396 * in the high byte of the file length. Truncate size in case 1397 * this CDROM was mounted with the cruft option. 1398 */ 1399 1400 if (sbi->s_cruft) 1401 inode->i_size &= 0x00ffffff; 1402 1403 if (de->interleave[0]) { 1404 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1405 inode->i_size = 0; 1406 } 1407 1408 /* I have no idea what file_unit_size is used for, so 1409 we will flag it for now */ 1410 if (de->file_unit_size[0] != 0) { 1411 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1412 inode->i_ino); 1413 } 1414 1415 /* I have no idea what other flag bits are used for, so 1416 we will flag it for now */ 1417 #ifdef DEBUG 1418 if((de->flags[-high_sierra] & ~2)!= 0){ 1419 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1420 "(%ld %x).\n", 1421 inode->i_ino, de->flags[-high_sierra]); 1422 } 1423 #endif 1424 1425 inode->i_mtime.tv_sec = 1426 inode->i_atime.tv_sec = 1427 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1428 inode->i_mtime.tv_nsec = 1429 inode->i_atime.tv_nsec = 1430 inode->i_ctime.tv_nsec = 0; 1431 1432 ei->i_first_extent = (isonum_733(de->extent) + 1433 isonum_711(de->ext_attr_length)); 1434 1435 /* Set the number of blocks for stat() - should be done before RR */ 1436 inode->i_blocks = (inode->i_size + 511) >> 9; 1437 1438 /* 1439 * Now test for possible Rock Ridge extensions which will override 1440 * some of these numbers in the inode structure. 1441 */ 1442 1443 if (!high_sierra) { 1444 parse_rock_ridge_inode(de, inode, relocated); 1445 /* if we want uid/gid set, override the rock ridge setting */ 1446 if (sbi->s_uid_set) 1447 inode->i_uid = sbi->s_uid; 1448 if (sbi->s_gid_set) 1449 inode->i_gid = sbi->s_gid; 1450 } 1451 /* Now set final access rights if overriding rock ridge setting */ 1452 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1453 sbi->s_dmode != ISOFS_INVALID_MODE) 1454 inode->i_mode = S_IFDIR | sbi->s_dmode; 1455 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1456 sbi->s_fmode != ISOFS_INVALID_MODE) 1457 inode->i_mode = S_IFREG | sbi->s_fmode; 1458 1459 /* Install the inode operations vector */ 1460 if (S_ISREG(inode->i_mode)) { 1461 inode->i_fop = &generic_ro_fops; 1462 switch (ei->i_file_format) { 1463 #ifdef CONFIG_ZISOFS 1464 case isofs_file_compressed: 1465 inode->i_data.a_ops = &zisofs_aops; 1466 break; 1467 #endif 1468 default: 1469 inode->i_data.a_ops = &isofs_aops; 1470 break; 1471 } 1472 } else if (S_ISDIR(inode->i_mode)) { 1473 inode->i_op = &isofs_dir_inode_operations; 1474 inode->i_fop = &isofs_dir_operations; 1475 } else if (S_ISLNK(inode->i_mode)) { 1476 inode->i_op = &page_symlink_inode_operations; 1477 inode_nohighmem(inode); 1478 inode->i_data.a_ops = &isofs_symlink_aops; 1479 } else 1480 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1481 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1482 1483 ret = 0; 1484 out: 1485 kfree(tmpde); 1486 if (bh) 1487 brelse(bh); 1488 return ret; 1489 1490 out_badread: 1491 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1492 fail: 1493 goto out; 1494 } 1495 1496 struct isofs_iget5_callback_data { 1497 unsigned long block; 1498 unsigned long offset; 1499 }; 1500 1501 static int isofs_iget5_test(struct inode *ino, void *data) 1502 { 1503 struct iso_inode_info *i = ISOFS_I(ino); 1504 struct isofs_iget5_callback_data *d = 1505 (struct isofs_iget5_callback_data*)data; 1506 return (i->i_iget5_block == d->block) 1507 && (i->i_iget5_offset == d->offset); 1508 } 1509 1510 static int isofs_iget5_set(struct inode *ino, void *data) 1511 { 1512 struct iso_inode_info *i = ISOFS_I(ino); 1513 struct isofs_iget5_callback_data *d = 1514 (struct isofs_iget5_callback_data*)data; 1515 i->i_iget5_block = d->block; 1516 i->i_iget5_offset = d->offset; 1517 return 0; 1518 } 1519 1520 /* Store, in the inode's containing structure, the block and block 1521 * offset that point to the underlying meta-data for the inode. The 1522 * code below is otherwise similar to the iget() code in 1523 * include/linux/fs.h */ 1524 struct inode *__isofs_iget(struct super_block *sb, 1525 unsigned long block, 1526 unsigned long offset, 1527 int relocated) 1528 { 1529 unsigned long hashval; 1530 struct inode *inode; 1531 struct isofs_iget5_callback_data data; 1532 long ret; 1533 1534 if (offset >= 1ul << sb->s_blocksize_bits) 1535 return ERR_PTR(-EINVAL); 1536 1537 data.block = block; 1538 data.offset = offset; 1539 1540 hashval = (block << sb->s_blocksize_bits) | offset; 1541 1542 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1543 &isofs_iget5_set, &data); 1544 1545 if (!inode) 1546 return ERR_PTR(-ENOMEM); 1547 1548 if (inode->i_state & I_NEW) { 1549 ret = isofs_read_inode(inode, relocated); 1550 if (ret < 0) { 1551 iget_failed(inode); 1552 inode = ERR_PTR(ret); 1553 } else { 1554 unlock_new_inode(inode); 1555 } 1556 } 1557 1558 return inode; 1559 } 1560 1561 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1562 int flags, const char *dev_name, void *data) 1563 { 1564 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1565 } 1566 1567 static struct file_system_type iso9660_fs_type = { 1568 .owner = THIS_MODULE, 1569 .name = "iso9660", 1570 .mount = isofs_mount, 1571 .kill_sb = kill_block_super, 1572 .fs_flags = FS_REQUIRES_DEV, 1573 }; 1574 MODULE_ALIAS_FS("iso9660"); 1575 MODULE_ALIAS("iso9660"); 1576 1577 static int __init init_iso9660_fs(void) 1578 { 1579 int err = init_inodecache(); 1580 if (err) 1581 goto out; 1582 #ifdef CONFIG_ZISOFS 1583 err = zisofs_init(); 1584 if (err) 1585 goto out1; 1586 #endif 1587 err = register_filesystem(&iso9660_fs_type); 1588 if (err) 1589 goto out2; 1590 return 0; 1591 out2: 1592 #ifdef CONFIG_ZISOFS 1593 zisofs_cleanup(); 1594 out1: 1595 #endif 1596 destroy_inodecache(); 1597 out: 1598 return err; 1599 } 1600 1601 static void __exit exit_iso9660_fs(void) 1602 { 1603 unregister_filesystem(&iso9660_fs_type); 1604 #ifdef CONFIG_ZISOFS 1605 zisofs_cleanup(); 1606 #endif 1607 destroy_inodecache(); 1608 } 1609 1610 module_init(init_iso9660_fs) 1611 module_exit(exit_iso9660_fs) 1612 MODULE_LICENSE("GPL"); 1613