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 == NULL) 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 if (n > 99) 414 return 0; 415 popt->session = n + 1; 416 break; 417 case Opt_sb: 418 if (match_int(&args[0], &option)) 419 return 0; 420 popt->sbsector = option; 421 break; 422 case Opt_check_r: 423 popt->check = 'r'; 424 break; 425 case Opt_check_s: 426 popt->check = 's'; 427 break; 428 case Opt_ignore: 429 break; 430 case Opt_uid: 431 if (match_int(&args[0], &option)) 432 return 0; 433 popt->uid = make_kuid(current_user_ns(), option); 434 if (!uid_valid(popt->uid)) 435 return 0; 436 popt->uid_set = 1; 437 break; 438 case Opt_gid: 439 if (match_int(&args[0], &option)) 440 return 0; 441 popt->gid = make_kgid(current_user_ns(), option); 442 if (!gid_valid(popt->gid)) 443 return 0; 444 popt->gid_set = 1; 445 break; 446 case Opt_mode: 447 if (match_int(&args[0], &option)) 448 return 0; 449 popt->fmode = option; 450 break; 451 case Opt_dmode: 452 if (match_int(&args[0], &option)) 453 return 0; 454 popt->dmode = option; 455 break; 456 case Opt_overriderockperm: 457 popt->overriderockperm = 1; 458 break; 459 case Opt_block: 460 if (match_int(&args[0], &option)) 461 return 0; 462 n = option; 463 if (n != 512 && n != 1024 && n != 2048) 464 return 0; 465 popt->blocksize = n; 466 break; 467 case Opt_nocompress: 468 popt->nocompress = 1; 469 break; 470 default: 471 return 0; 472 } 473 } 474 return 1; 475 } 476 477 /* 478 * Display the mount options in /proc/mounts. 479 */ 480 static int isofs_show_options(struct seq_file *m, struct dentry *root) 481 { 482 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 483 484 if (!sbi->s_rock) seq_puts(m, ",norock"); 485 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 486 if (sbi->s_cruft) seq_puts(m, ",cruft"); 487 if (sbi->s_hide) seq_puts(m, ",hide"); 488 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 489 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 490 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 491 if (sbi->s_utf8) seq_puts(m, ",utf8"); 492 493 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 494 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 495 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 496 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 497 498 if (root->d_sb->s_blocksize != 1024) 499 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 500 501 if (sbi->s_uid_set) 502 seq_printf(m, ",uid=%u", 503 from_kuid_munged(&init_user_ns, sbi->s_uid)); 504 if (sbi->s_gid_set) 505 seq_printf(m, ",gid=%u", 506 from_kgid_munged(&init_user_ns, sbi->s_gid)); 507 508 if (sbi->s_dmode != ISOFS_INVALID_MODE) 509 seq_printf(m, ",dmode=%o", sbi->s_dmode); 510 if (sbi->s_fmode != ISOFS_INVALID_MODE) 511 seq_printf(m, ",fmode=%o", sbi->s_fmode); 512 513 if (sbi->s_nls_iocharset && 514 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) 515 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 516 return 0; 517 } 518 519 /* 520 * look if the driver can tell the multi session redirection value 521 * 522 * don't change this if you don't know what you do, please! 523 * Multisession is legal only with XA disks. 524 * A non-XA disk with more than one volume descriptor may do it right, but 525 * usually is written in a nowhere standardized "multi-partition" manner. 526 * Multisession uses absolute addressing (solely the first frame of the whole 527 * track is #0), multi-partition uses relative addressing (each first frame of 528 * each track is #0), and a track is not a session. 529 * 530 * A broken CDwriter software or drive firmware does not set new standards, 531 * at least not if conflicting with the existing ones. 532 * 533 * emoenke@gwdg.de 534 */ 535 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 536 537 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 538 { 539 struct cdrom_multisession ms_info; 540 unsigned int vol_desc_start; 541 struct block_device *bdev = sb->s_bdev; 542 int i; 543 544 vol_desc_start=0; 545 ms_info.addr_format=CDROM_LBA; 546 if(session >= 0 && session <= 99) { 547 struct cdrom_tocentry Te; 548 Te.cdte_track=session; 549 Te.cdte_format=CDROM_LBA; 550 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); 551 if (!i) { 552 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 553 session, Te.cdte_addr.lba, 554 Te.cdte_ctrl&CDROM_DATA_TRACK); 555 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) 556 return Te.cdte_addr.lba; 557 } 558 559 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 560 } 561 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); 562 if (session > 0) 563 printk(KERN_ERR "ISOFS: Invalid session number\n"); 564 #if 0 565 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); 566 if (i==0) { 567 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); 568 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); 569 } 570 #endif 571 if (i==0) 572 #if WE_OBEY_THE_WRITTEN_STANDARDS 573 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ 574 #endif 575 vol_desc_start=ms_info.addr.lba; 576 return vol_desc_start; 577 } 578 579 /* 580 * Check if root directory is empty (has less than 3 files). 581 * 582 * Used to detect broken CDs where ISO root directory is empty but Joliet root 583 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 584 * (and Joliet used instead) or else no files would be visible. 585 */ 586 static bool rootdir_empty(struct super_block *sb, unsigned long block) 587 { 588 int offset = 0, files = 0, de_len; 589 struct iso_directory_record *de; 590 struct buffer_head *bh; 591 592 bh = sb_bread(sb, block); 593 if (!bh) 594 return true; 595 while (files < 3) { 596 de = (struct iso_directory_record *) (bh->b_data + offset); 597 de_len = *(unsigned char *) de; 598 if (de_len == 0) 599 break; 600 files++; 601 offset += de_len; 602 } 603 brelse(bh); 604 return files < 3; 605 } 606 607 /* 608 * Initialize the superblock and read the root inode. 609 * 610 * Note: a check_disk_change() has been done immediately prior 611 * to this call, so we don't need to check again. 612 */ 613 static int isofs_fill_super(struct super_block *s, void *data, int silent) 614 { 615 struct buffer_head *bh = NULL, *pri_bh = NULL; 616 struct hs_primary_descriptor *h_pri = NULL; 617 struct iso_primary_descriptor *pri = NULL; 618 struct iso_supplementary_descriptor *sec = NULL; 619 struct iso_directory_record *rootp; 620 struct inode *inode; 621 struct iso9660_options opt; 622 struct isofs_sb_info *sbi; 623 unsigned long first_data_zone; 624 int joliet_level = 0; 625 int iso_blknum, block; 626 int orig_zonesize; 627 int table, error = -EINVAL; 628 unsigned int vol_desc_start; 629 630 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 631 if (!sbi) 632 return -ENOMEM; 633 s->s_fs_info = sbi; 634 635 if (!parse_options((char *)data, &opt)) 636 goto out_freesbi; 637 638 /* 639 * First of all, get the hardware blocksize for this device. 640 * If we don't know what it is, or the hardware blocksize is 641 * larger than the blocksize the user specified, then use 642 * that value. 643 */ 644 /* 645 * What if bugger tells us to go beyond page size? 646 */ 647 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 648 649 sbi->s_high_sierra = 0; /* default is iso9660 */ 650 sbi->s_session = opt.session; 651 sbi->s_sbsector = opt.sbsector; 652 653 vol_desc_start = (opt.sbsector != -1) ? 654 opt.sbsector : isofs_get_last_session(s,opt.session); 655 656 for (iso_blknum = vol_desc_start+16; 657 iso_blknum < vol_desc_start+100; iso_blknum++) { 658 struct hs_volume_descriptor *hdp; 659 struct iso_volume_descriptor *vdp; 660 661 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 662 if (!(bh = sb_bread(s, block))) 663 goto out_no_read; 664 665 vdp = (struct iso_volume_descriptor *)bh->b_data; 666 hdp = (struct hs_volume_descriptor *)bh->b_data; 667 668 /* 669 * Due to the overlapping physical location of the descriptors, 670 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 671 * proper identification in this case, we first check for ISO. 672 */ 673 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 674 if (isonum_711(vdp->type) == ISO_VD_END) 675 break; 676 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 677 if (pri == NULL) { 678 pri = (struct iso_primary_descriptor *)vdp; 679 /* Save the buffer in case we need it ... */ 680 pri_bh = bh; 681 bh = NULL; 682 } 683 } 684 #ifdef CONFIG_JOLIET 685 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 686 sec = (struct iso_supplementary_descriptor *)vdp; 687 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 688 if (opt.joliet) { 689 if (sec->escape[2] == 0x40) 690 joliet_level = 1; 691 else if (sec->escape[2] == 0x43) 692 joliet_level = 2; 693 else if (sec->escape[2] == 0x45) 694 joliet_level = 3; 695 696 printk(KERN_DEBUG "ISO 9660 Extensions: " 697 "Microsoft Joliet Level %d\n", 698 joliet_level); 699 } 700 goto root_found; 701 } else { 702 /* Unknown supplementary volume descriptor */ 703 sec = NULL; 704 } 705 } 706 #endif 707 } else { 708 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 709 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 710 goto out_freebh; 711 712 sbi->s_high_sierra = 1; 713 opt.rock = 0; 714 h_pri = (struct hs_primary_descriptor *)vdp; 715 goto root_found; 716 } 717 } 718 719 /* Just skip any volume descriptors we don't recognize */ 720 721 brelse(bh); 722 bh = NULL; 723 } 724 /* 725 * If we fall through, either no volume descriptor was found, 726 * or else we passed a primary descriptor looking for others. 727 */ 728 if (!pri) 729 goto out_unknown_format; 730 brelse(bh); 731 bh = pri_bh; 732 pri_bh = NULL; 733 734 root_found: 735 /* We don't support read-write mounts */ 736 if (!(s->s_flags & MS_RDONLY)) { 737 error = -EACCES; 738 goto out_freebh; 739 } 740 741 if (joliet_level && (pri == NULL || !opt.rock)) { 742 /* This is the case of Joliet with the norock mount flag. 743 * A disc with both Joliet and Rock Ridge is handled later 744 */ 745 pri = (struct iso_primary_descriptor *) sec; 746 } 747 748 if(sbi->s_high_sierra){ 749 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 750 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 751 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 752 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 753 } else { 754 if (!pri) 755 goto out_freebh; 756 rootp = (struct iso_directory_record *) pri->root_directory_record; 757 sbi->s_nzones = isonum_733(pri->volume_space_size); 758 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 759 sbi->s_max_size = isonum_733(pri->volume_space_size); 760 } 761 762 sbi->s_ninodes = 0; /* No way to figure this out easily */ 763 764 orig_zonesize = sbi->s_log_zone_size; 765 /* 766 * If the zone size is smaller than the hardware sector size, 767 * this is a fatal error. This would occur if the disc drive 768 * had sectors that were 2048 bytes, but the filesystem had 769 * blocks that were 512 bytes (which should only very rarely 770 * happen.) 771 */ 772 if (orig_zonesize < opt.blocksize) 773 goto out_bad_size; 774 775 /* RDE: convert log zone size to bit shift */ 776 switch (sbi->s_log_zone_size) { 777 case 512: sbi->s_log_zone_size = 9; break; 778 case 1024: sbi->s_log_zone_size = 10; break; 779 case 2048: sbi->s_log_zone_size = 11; break; 780 781 default: 782 goto out_bad_zone_size; 783 } 784 785 s->s_magic = ISOFS_SUPER_MAGIC; 786 787 /* 788 * With multi-extent files, file size is only limited by the maximum 789 * size of a file system, which is 8 TB. 790 */ 791 s->s_maxbytes = 0x80000000000LL; 792 793 /* Set this for reference. Its not currently used except on write 794 which we don't have .. */ 795 796 first_data_zone = isonum_733(rootp->extent) + 797 isonum_711(rootp->ext_attr_length); 798 sbi->s_firstdatazone = first_data_zone; 799 #ifndef BEQUIET 800 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 801 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 802 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 803 if(sbi->s_high_sierra) 804 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 805 #endif 806 807 /* 808 * If the Joliet level is set, we _may_ decide to use the 809 * secondary descriptor, but can't be sure until after we 810 * read the root inode. But before reading the root inode 811 * we may need to change the device blocksize, and would 812 * rather release the old buffer first. So, we cache the 813 * first_data_zone value from the secondary descriptor. 814 */ 815 if (joliet_level) { 816 pri = (struct iso_primary_descriptor *) sec; 817 rootp = (struct iso_directory_record *) 818 pri->root_directory_record; 819 first_data_zone = isonum_733(rootp->extent) + 820 isonum_711(rootp->ext_attr_length); 821 } 822 823 /* 824 * We're all done using the volume descriptor, and may need 825 * to change the device blocksize, so release the buffer now. 826 */ 827 brelse(pri_bh); 828 brelse(bh); 829 830 /* 831 * Force the blocksize to 512 for 512 byte sectors. The file 832 * read primitives really get it wrong in a bad way if we don't 833 * do this. 834 * 835 * Note - we should never be setting the blocksize to something 836 * less than the hardware sector size for the device. If we 837 * do, we would end up having to read larger buffers and split 838 * out portions to satisfy requests. 839 * 840 * Note2- the idea here is that we want to deal with the optimal 841 * zonesize in the filesystem. If we have it set to something less, 842 * then we have horrible problems with trying to piece together 843 * bits of adjacent blocks in order to properly read directory 844 * entries. By forcing the blocksize in this way, we ensure 845 * that we will never be required to do this. 846 */ 847 sb_set_blocksize(s, orig_zonesize); 848 849 sbi->s_nls_iocharset = NULL; 850 851 #ifdef CONFIG_JOLIET 852 if (joliet_level && opt.utf8 == 0) { 853 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 854 sbi->s_nls_iocharset = load_nls(p); 855 if (! sbi->s_nls_iocharset) { 856 /* Fail only if explicit charset specified */ 857 if (opt.iocharset) 858 goto out_freesbi; 859 sbi->s_nls_iocharset = load_nls_default(); 860 } 861 } 862 #endif 863 s->s_op = &isofs_sops; 864 s->s_export_op = &isofs_export_ops; 865 sbi->s_mapping = opt.map; 866 sbi->s_rock = (opt.rock ? 2 : 0); 867 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 868 sbi->s_cruft = opt.cruft; 869 sbi->s_hide = opt.hide; 870 sbi->s_showassoc = opt.showassoc; 871 sbi->s_uid = opt.uid; 872 sbi->s_gid = opt.gid; 873 sbi->s_uid_set = opt.uid_set; 874 sbi->s_gid_set = opt.gid_set; 875 sbi->s_utf8 = opt.utf8; 876 sbi->s_nocompress = opt.nocompress; 877 sbi->s_overriderockperm = opt.overriderockperm; 878 /* 879 * It would be incredibly stupid to allow people to mark every file 880 * on the disk as suid, so we merely allow them to set the default 881 * permissions. 882 */ 883 if (opt.fmode != ISOFS_INVALID_MODE) 884 sbi->s_fmode = opt.fmode & 0777; 885 else 886 sbi->s_fmode = ISOFS_INVALID_MODE; 887 if (opt.dmode != ISOFS_INVALID_MODE) 888 sbi->s_dmode = opt.dmode & 0777; 889 else 890 sbi->s_dmode = ISOFS_INVALID_MODE; 891 892 /* 893 * Read the root inode, which _may_ result in changing 894 * the s_rock flag. Once we have the final s_rock value, 895 * we then decide whether to use the Joliet descriptor. 896 */ 897 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 898 if (IS_ERR(inode)) 899 goto out_no_root; 900 901 /* 902 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 903 * correct Joliet root directory. 904 */ 905 if (sbi->s_rock == 1 && joliet_level && 906 rootdir_empty(s, sbi->s_firstdatazone)) { 907 printk(KERN_NOTICE 908 "ISOFS: primary root directory is empty. " 909 "Disabling Rock Ridge and switching to Joliet."); 910 sbi->s_rock = 0; 911 } 912 913 /* 914 * If this disk has both Rock Ridge and Joliet on it, then we 915 * want to use Rock Ridge by default. This can be overridden 916 * by using the norock mount option. There is still one other 917 * possibility that is not taken into account: a Rock Ridge 918 * CD with Unicode names. Until someone sees such a beast, it 919 * will not be supported. 920 */ 921 if (sbi->s_rock == 1) { 922 joliet_level = 0; 923 } else if (joliet_level) { 924 sbi->s_rock = 0; 925 if (sbi->s_firstdatazone != first_data_zone) { 926 sbi->s_firstdatazone = first_data_zone; 927 printk(KERN_DEBUG 928 "ISOFS: changing to secondary root\n"); 929 iput(inode); 930 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 931 if (IS_ERR(inode)) 932 goto out_no_root; 933 } 934 } 935 936 if (opt.check == 'u') { 937 /* Only Joliet is case insensitive by default */ 938 if (joliet_level) 939 opt.check = 'r'; 940 else 941 opt.check = 's'; 942 } 943 sbi->s_joliet_level = joliet_level; 944 945 /* Make sure the root inode is a directory */ 946 if (!S_ISDIR(inode->i_mode)) { 947 printk(KERN_WARNING 948 "isofs_fill_super: root inode is not a directory. " 949 "Corrupted media?\n"); 950 goto out_iput; 951 } 952 953 table = 0; 954 if (joliet_level) 955 table += 2; 956 if (opt.check == 'r') 957 table++; 958 sbi->s_check = opt.check; 959 960 if (table) 961 s->s_d_op = &isofs_dentry_ops[table - 1]; 962 963 /* get the root dentry */ 964 s->s_root = d_make_root(inode); 965 if (!(s->s_root)) { 966 error = -ENOMEM; 967 goto out_no_inode; 968 } 969 970 kfree(opt.iocharset); 971 972 return 0; 973 974 /* 975 * Display error messages and free resources. 976 */ 977 out_iput: 978 iput(inode); 979 goto out_no_inode; 980 out_no_root: 981 error = PTR_ERR(inode); 982 if (error != -ENOMEM) 983 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 984 out_no_inode: 985 #ifdef CONFIG_JOLIET 986 unload_nls(sbi->s_nls_iocharset); 987 #endif 988 goto out_freesbi; 989 out_no_read: 990 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 991 __func__, s->s_id, iso_blknum, block); 992 goto out_freebh; 993 out_bad_zone_size: 994 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 995 sbi->s_log_zone_size); 996 goto out_freebh; 997 out_bad_size: 998 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 999 orig_zonesize, opt.blocksize); 1000 goto out_freebh; 1001 out_unknown_format: 1002 if (!silent) 1003 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1004 1005 out_freebh: 1006 brelse(bh); 1007 brelse(pri_bh); 1008 out_freesbi: 1009 kfree(opt.iocharset); 1010 kfree(sbi); 1011 s->s_fs_info = NULL; 1012 return error; 1013 } 1014 1015 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1016 { 1017 struct super_block *sb = dentry->d_sb; 1018 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1019 1020 buf->f_type = ISOFS_SUPER_MAGIC; 1021 buf->f_bsize = sb->s_blocksize; 1022 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1023 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1024 buf->f_bfree = 0; 1025 buf->f_bavail = 0; 1026 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1027 buf->f_ffree = 0; 1028 buf->f_fsid.val[0] = (u32)id; 1029 buf->f_fsid.val[1] = (u32)(id >> 32); 1030 buf->f_namelen = NAME_MAX; 1031 return 0; 1032 } 1033 1034 /* 1035 * Get a set of blocks; filling in buffer_heads if already allocated 1036 * or getblk() if they are not. Returns the number of blocks inserted 1037 * (-ve == error.) 1038 */ 1039 int isofs_get_blocks(struct inode *inode, sector_t iblock, 1040 struct buffer_head **bh, unsigned long nblocks) 1041 { 1042 unsigned long b_off = iblock; 1043 unsigned offset, sect_size; 1044 unsigned int firstext; 1045 unsigned long nextblk, nextoff; 1046 int section, rv, error; 1047 struct iso_inode_info *ei = ISOFS_I(inode); 1048 1049 error = -EIO; 1050 rv = 0; 1051 if (iblock != b_off) { 1052 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1053 goto abort; 1054 } 1055 1056 1057 offset = 0; 1058 firstext = ei->i_first_extent; 1059 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1060 nextblk = ei->i_next_section_block; 1061 nextoff = ei->i_next_section_offset; 1062 section = 0; 1063 1064 while (nblocks) { 1065 /* If we are *way* beyond the end of the file, print a message. 1066 * Access beyond the end of the file up to the next page boundary 1067 * is normal, however because of the way the page cache works. 1068 * In this case, we just return 0 so that we can properly fill 1069 * the page with useless information without generating any 1070 * I/O errors. 1071 */ 1072 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1073 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1074 __func__, b_off, 1075 (unsigned long long)inode->i_size); 1076 goto abort; 1077 } 1078 1079 /* On the last section, nextblk == 0, section size is likely to 1080 * exceed sect_size by a partial block, and access beyond the 1081 * end of the file will reach beyond the section size, too. 1082 */ 1083 while (nextblk && (b_off >= (offset + sect_size))) { 1084 struct inode *ninode; 1085 1086 offset += sect_size; 1087 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1088 if (IS_ERR(ninode)) { 1089 error = PTR_ERR(ninode); 1090 goto abort; 1091 } 1092 firstext = ISOFS_I(ninode)->i_first_extent; 1093 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1094 nextblk = ISOFS_I(ninode)->i_next_section_block; 1095 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1096 iput(ninode); 1097 1098 if (++section > 100) { 1099 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1100 " aborting...\n", __func__); 1101 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1102 "nextblk=%lu nextoff=%lu\n", __func__, 1103 b_off, firstext, (unsigned) sect_size, 1104 nextblk, nextoff); 1105 goto abort; 1106 } 1107 } 1108 1109 if (*bh) { 1110 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1111 } else { 1112 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1113 if (!*bh) 1114 goto abort; 1115 } 1116 bh++; /* Next buffer head */ 1117 b_off++; /* Next buffer offset */ 1118 nblocks--; 1119 rv++; 1120 } 1121 1122 error = 0; 1123 abort: 1124 return rv != 0 ? rv : error; 1125 } 1126 1127 /* 1128 * Used by the standard interfaces. 1129 */ 1130 static int isofs_get_block(struct inode *inode, sector_t iblock, 1131 struct buffer_head *bh_result, int create) 1132 { 1133 int ret; 1134 1135 if (create) { 1136 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1137 return -EROFS; 1138 } 1139 1140 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1141 return ret < 0 ? ret : 0; 1142 } 1143 1144 static int isofs_bmap(struct inode *inode, sector_t block) 1145 { 1146 struct buffer_head dummy; 1147 int error; 1148 1149 dummy.b_state = 0; 1150 dummy.b_blocknr = -1000; 1151 error = isofs_get_block(inode, block, &dummy, 0); 1152 if (!error) 1153 return dummy.b_blocknr; 1154 return 0; 1155 } 1156 1157 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1158 { 1159 sector_t blknr = isofs_bmap(inode, block); 1160 if (!blknr) 1161 return NULL; 1162 return sb_bread(inode->i_sb, blknr); 1163 } 1164 1165 static int isofs_readpage(struct file *file, struct page *page) 1166 { 1167 return mpage_readpage(page, isofs_get_block); 1168 } 1169 1170 static int isofs_readpages(struct file *file, struct address_space *mapping, 1171 struct list_head *pages, unsigned nr_pages) 1172 { 1173 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); 1174 } 1175 1176 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1177 { 1178 return generic_block_bmap(mapping,block,isofs_get_block); 1179 } 1180 1181 static const struct address_space_operations isofs_aops = { 1182 .readpage = isofs_readpage, 1183 .readpages = isofs_readpages, 1184 .bmap = _isofs_bmap 1185 }; 1186 1187 static int isofs_read_level3_size(struct inode *inode) 1188 { 1189 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1190 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1191 struct buffer_head *bh = NULL; 1192 unsigned long block, offset, block_saved, offset_saved; 1193 int i = 0; 1194 int more_entries = 0; 1195 struct iso_directory_record *tmpde = NULL; 1196 struct iso_inode_info *ei = ISOFS_I(inode); 1197 1198 inode->i_size = 0; 1199 1200 /* The first 16 blocks are reserved as the System Area. Thus, 1201 * no inodes can appear in block 0. We use this to flag that 1202 * this is the last section. */ 1203 ei->i_next_section_block = 0; 1204 ei->i_next_section_offset = 0; 1205 1206 block = ei->i_iget5_block; 1207 offset = ei->i_iget5_offset; 1208 1209 do { 1210 struct iso_directory_record *de; 1211 unsigned int de_len; 1212 1213 if (!bh) { 1214 bh = sb_bread(inode->i_sb, block); 1215 if (!bh) 1216 goto out_noread; 1217 } 1218 de = (struct iso_directory_record *) (bh->b_data + offset); 1219 de_len = *(unsigned char *) de; 1220 1221 if (de_len == 0) { 1222 brelse(bh); 1223 bh = NULL; 1224 ++block; 1225 offset = 0; 1226 continue; 1227 } 1228 1229 block_saved = block; 1230 offset_saved = offset; 1231 offset += de_len; 1232 1233 /* Make sure we have a full directory entry */ 1234 if (offset >= bufsize) { 1235 int slop = bufsize - offset + de_len; 1236 if (!tmpde) { 1237 tmpde = kmalloc(256, GFP_KERNEL); 1238 if (!tmpde) 1239 goto out_nomem; 1240 } 1241 memcpy(tmpde, de, slop); 1242 offset &= bufsize - 1; 1243 block++; 1244 brelse(bh); 1245 bh = NULL; 1246 if (offset) { 1247 bh = sb_bread(inode->i_sb, block); 1248 if (!bh) 1249 goto out_noread; 1250 memcpy((void *)tmpde+slop, bh->b_data, offset); 1251 } 1252 de = tmpde; 1253 } 1254 1255 inode->i_size += isonum_733(de->size); 1256 if (i == 1) { 1257 ei->i_next_section_block = block_saved; 1258 ei->i_next_section_offset = offset_saved; 1259 } 1260 1261 more_entries = de->flags[-high_sierra] & 0x80; 1262 1263 i++; 1264 if (i > 100) 1265 goto out_toomany; 1266 } while (more_entries); 1267 out: 1268 kfree(tmpde); 1269 if (bh) 1270 brelse(bh); 1271 return 0; 1272 1273 out_nomem: 1274 if (bh) 1275 brelse(bh); 1276 return -ENOMEM; 1277 1278 out_noread: 1279 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1280 kfree(tmpde); 1281 return -EIO; 1282 1283 out_toomany: 1284 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1285 "isofs_read_level3_size: inode=%lu\n", 1286 __func__, inode->i_ino); 1287 goto out; 1288 } 1289 1290 static int isofs_read_inode(struct inode *inode, int relocated) 1291 { 1292 struct super_block *sb = inode->i_sb; 1293 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1294 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1295 unsigned long block; 1296 int high_sierra = sbi->s_high_sierra; 1297 struct buffer_head *bh = NULL; 1298 struct iso_directory_record *de; 1299 struct iso_directory_record *tmpde = NULL; 1300 unsigned int de_len; 1301 unsigned long offset; 1302 struct iso_inode_info *ei = ISOFS_I(inode); 1303 int ret = -EIO; 1304 1305 block = ei->i_iget5_block; 1306 bh = sb_bread(inode->i_sb, block); 1307 if (!bh) 1308 goto out_badread; 1309 1310 offset = ei->i_iget5_offset; 1311 1312 de = (struct iso_directory_record *) (bh->b_data + offset); 1313 de_len = *(unsigned char *) de; 1314 1315 if (offset + de_len > bufsize) { 1316 int frag1 = bufsize - offset; 1317 1318 tmpde = kmalloc(de_len, GFP_KERNEL); 1319 if (tmpde == NULL) { 1320 printk(KERN_INFO "%s: out of memory\n", __func__); 1321 ret = -ENOMEM; 1322 goto fail; 1323 } 1324 memcpy(tmpde, bh->b_data + offset, frag1); 1325 brelse(bh); 1326 bh = sb_bread(inode->i_sb, ++block); 1327 if (!bh) 1328 goto out_badread; 1329 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1330 de = tmpde; 1331 } 1332 1333 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1334 ei->i_iget5_offset, 1335 ISOFS_BUFFER_BITS(inode)); 1336 1337 /* Assume it is a normal-format file unless told otherwise */ 1338 ei->i_file_format = isofs_file_normal; 1339 1340 if (de->flags[-high_sierra] & 2) { 1341 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1342 inode->i_mode = S_IFDIR | sbi->s_dmode; 1343 else 1344 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1345 set_nlink(inode, 1); /* 1346 * Set to 1. We know there are 2, but 1347 * the find utility tries to optimize 1348 * if it is 2, and it screws up. It is 1349 * easier to give 1 which tells find to 1350 * do it the hard way. 1351 */ 1352 } else { 1353 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1354 inode->i_mode = S_IFREG | sbi->s_fmode; 1355 } else { 1356 /* 1357 * Set default permissions: r-x for all. The disc 1358 * could be shared with DOS machines so virtually 1359 * anything could be a valid executable. 1360 */ 1361 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1362 } 1363 set_nlink(inode, 1); 1364 } 1365 inode->i_uid = sbi->s_uid; 1366 inode->i_gid = sbi->s_gid; 1367 inode->i_blocks = 0; 1368 1369 ei->i_format_parm[0] = 0; 1370 ei->i_format_parm[1] = 0; 1371 ei->i_format_parm[2] = 0; 1372 1373 ei->i_section_size = isonum_733(de->size); 1374 if (de->flags[-high_sierra] & 0x80) { 1375 ret = isofs_read_level3_size(inode); 1376 if (ret < 0) 1377 goto fail; 1378 ret = -EIO; 1379 } else { 1380 ei->i_next_section_block = 0; 1381 ei->i_next_section_offset = 0; 1382 inode->i_size = isonum_733(de->size); 1383 } 1384 1385 /* 1386 * Some dipshit decided to store some other bit of information 1387 * in the high byte of the file length. Truncate size in case 1388 * this CDROM was mounted with the cruft option. 1389 */ 1390 1391 if (sbi->s_cruft) 1392 inode->i_size &= 0x00ffffff; 1393 1394 if (de->interleave[0]) { 1395 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1396 inode->i_size = 0; 1397 } 1398 1399 /* I have no idea what file_unit_size is used for, so 1400 we will flag it for now */ 1401 if (de->file_unit_size[0] != 0) { 1402 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1403 inode->i_ino); 1404 } 1405 1406 /* I have no idea what other flag bits are used for, so 1407 we will flag it for now */ 1408 #ifdef DEBUG 1409 if((de->flags[-high_sierra] & ~2)!= 0){ 1410 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1411 "(%ld %x).\n", 1412 inode->i_ino, de->flags[-high_sierra]); 1413 } 1414 #endif 1415 1416 inode->i_mtime.tv_sec = 1417 inode->i_atime.tv_sec = 1418 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1419 inode->i_mtime.tv_nsec = 1420 inode->i_atime.tv_nsec = 1421 inode->i_ctime.tv_nsec = 0; 1422 1423 ei->i_first_extent = (isonum_733(de->extent) + 1424 isonum_711(de->ext_attr_length)); 1425 1426 /* Set the number of blocks for stat() - should be done before RR */ 1427 inode->i_blocks = (inode->i_size + 511) >> 9; 1428 1429 /* 1430 * Now test for possible Rock Ridge extensions which will override 1431 * some of these numbers in the inode structure. 1432 */ 1433 1434 if (!high_sierra) { 1435 parse_rock_ridge_inode(de, inode, relocated); 1436 /* if we want uid/gid set, override the rock ridge setting */ 1437 if (sbi->s_uid_set) 1438 inode->i_uid = sbi->s_uid; 1439 if (sbi->s_gid_set) 1440 inode->i_gid = sbi->s_gid; 1441 } 1442 /* Now set final access rights if overriding rock ridge setting */ 1443 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1444 sbi->s_dmode != ISOFS_INVALID_MODE) 1445 inode->i_mode = S_IFDIR | sbi->s_dmode; 1446 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1447 sbi->s_fmode != ISOFS_INVALID_MODE) 1448 inode->i_mode = S_IFREG | sbi->s_fmode; 1449 1450 /* Install the inode operations vector */ 1451 if (S_ISREG(inode->i_mode)) { 1452 inode->i_fop = &generic_ro_fops; 1453 switch (ei->i_file_format) { 1454 #ifdef CONFIG_ZISOFS 1455 case isofs_file_compressed: 1456 inode->i_data.a_ops = &zisofs_aops; 1457 break; 1458 #endif 1459 default: 1460 inode->i_data.a_ops = &isofs_aops; 1461 break; 1462 } 1463 } else if (S_ISDIR(inode->i_mode)) { 1464 inode->i_op = &isofs_dir_inode_operations; 1465 inode->i_fop = &isofs_dir_operations; 1466 } else if (S_ISLNK(inode->i_mode)) { 1467 inode->i_op = &page_symlink_inode_operations; 1468 inode_nohighmem(inode); 1469 inode->i_data.a_ops = &isofs_symlink_aops; 1470 } else 1471 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1472 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1473 1474 ret = 0; 1475 out: 1476 kfree(tmpde); 1477 if (bh) 1478 brelse(bh); 1479 return ret; 1480 1481 out_badread: 1482 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1483 fail: 1484 goto out; 1485 } 1486 1487 struct isofs_iget5_callback_data { 1488 unsigned long block; 1489 unsigned long offset; 1490 }; 1491 1492 static int isofs_iget5_test(struct inode *ino, void *data) 1493 { 1494 struct iso_inode_info *i = ISOFS_I(ino); 1495 struct isofs_iget5_callback_data *d = 1496 (struct isofs_iget5_callback_data*)data; 1497 return (i->i_iget5_block == d->block) 1498 && (i->i_iget5_offset == d->offset); 1499 } 1500 1501 static int isofs_iget5_set(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 i->i_iget5_block = d->block; 1507 i->i_iget5_offset = d->offset; 1508 return 0; 1509 } 1510 1511 /* Store, in the inode's containing structure, the block and block 1512 * offset that point to the underlying meta-data for the inode. The 1513 * code below is otherwise similar to the iget() code in 1514 * include/linux/fs.h */ 1515 struct inode *__isofs_iget(struct super_block *sb, 1516 unsigned long block, 1517 unsigned long offset, 1518 int relocated) 1519 { 1520 unsigned long hashval; 1521 struct inode *inode; 1522 struct isofs_iget5_callback_data data; 1523 long ret; 1524 1525 if (offset >= 1ul << sb->s_blocksize_bits) 1526 return ERR_PTR(-EINVAL); 1527 1528 data.block = block; 1529 data.offset = offset; 1530 1531 hashval = (block << sb->s_blocksize_bits) | offset; 1532 1533 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1534 &isofs_iget5_set, &data); 1535 1536 if (!inode) 1537 return ERR_PTR(-ENOMEM); 1538 1539 if (inode->i_state & I_NEW) { 1540 ret = isofs_read_inode(inode, relocated); 1541 if (ret < 0) { 1542 iget_failed(inode); 1543 inode = ERR_PTR(ret); 1544 } else { 1545 unlock_new_inode(inode); 1546 } 1547 } 1548 1549 return inode; 1550 } 1551 1552 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1553 int flags, const char *dev_name, void *data) 1554 { 1555 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1556 } 1557 1558 static struct file_system_type iso9660_fs_type = { 1559 .owner = THIS_MODULE, 1560 .name = "iso9660", 1561 .mount = isofs_mount, 1562 .kill_sb = kill_block_super, 1563 .fs_flags = FS_REQUIRES_DEV, 1564 }; 1565 MODULE_ALIAS_FS("iso9660"); 1566 MODULE_ALIAS("iso9660"); 1567 1568 static int __init init_iso9660_fs(void) 1569 { 1570 int err = init_inodecache(); 1571 if (err) 1572 goto out; 1573 #ifdef CONFIG_ZISOFS 1574 err = zisofs_init(); 1575 if (err) 1576 goto out1; 1577 #endif 1578 err = register_filesystem(&iso9660_fs_type); 1579 if (err) 1580 goto out2; 1581 return 0; 1582 out2: 1583 #ifdef CONFIG_ZISOFS 1584 zisofs_cleanup(); 1585 out1: 1586 #endif 1587 destroy_inodecache(); 1588 out: 1589 return err; 1590 } 1591 1592 static void __exit exit_iso9660_fs(void) 1593 { 1594 unregister_filesystem(&iso9660_fs_type); 1595 #ifdef CONFIG_ZISOFS 1596 zisofs_cleanup(); 1597 #endif 1598 destroy_inodecache(); 1599 } 1600 1601 module_init(init_iso9660_fs) 1602 module_exit(exit_iso9660_fs) 1603 MODULE_LICENSE("GPL"); 1604