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/nls.h> 19 #include <linux/ctype.h> 20 #include <linux/statfs.h> 21 #include <linux/cdrom.h> 22 #include <linux/parser.h> 23 #include <linux/mpage.h> 24 25 #include "isofs.h" 26 #include "zisofs.h" 27 28 #define BEQUIET 29 30 static int isofs_hashi(const struct dentry *parent, const struct inode *inode, 31 struct qstr *qstr); 32 static int isofs_hash(const struct dentry *parent, const struct inode *inode, 33 struct qstr *qstr); 34 static int isofs_dentry_cmpi(const struct dentry *parent, 35 const struct inode *pinode, 36 const struct dentry *dentry, const struct inode *inode, 37 unsigned int len, const char *str, const struct qstr *name); 38 static int isofs_dentry_cmp(const struct dentry *parent, 39 const struct inode *pinode, 40 const struct dentry *dentry, const struct inode *inode, 41 unsigned int len, const char *str, const struct qstr *name); 42 43 #ifdef CONFIG_JOLIET 44 static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode, 45 struct qstr *qstr); 46 static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode, 47 struct qstr *qstr); 48 static int isofs_dentry_cmpi_ms(const struct dentry *parent, 49 const struct inode *pinode, 50 const struct dentry *dentry, const struct inode *inode, 51 unsigned int len, const char *str, const struct qstr *name); 52 static int isofs_dentry_cmp_ms(const struct dentry *parent, 53 const struct inode *pinode, 54 const struct dentry *dentry, const struct inode *inode, 55 unsigned int len, const char *str, const struct qstr *name); 56 #endif 57 58 static void isofs_put_super(struct super_block *sb) 59 { 60 struct isofs_sb_info *sbi = ISOFS_SB(sb); 61 62 #ifdef CONFIG_JOLIET 63 unload_nls(sbi->s_nls_iocharset); 64 #endif 65 66 kfree(sbi); 67 sb->s_fs_info = NULL; 68 return; 69 } 70 71 static int isofs_read_inode(struct inode *); 72 static int isofs_statfs (struct dentry *, struct kstatfs *); 73 74 static struct kmem_cache *isofs_inode_cachep; 75 76 static struct inode *isofs_alloc_inode(struct super_block *sb) 77 { 78 struct iso_inode_info *ei; 79 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); 80 if (!ei) 81 return NULL; 82 return &ei->vfs_inode; 83 } 84 85 static void isofs_i_callback(struct rcu_head *head) 86 { 87 struct inode *inode = container_of(head, struct inode, i_rcu); 88 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 89 } 90 91 static void isofs_destroy_inode(struct inode *inode) 92 { 93 call_rcu(&inode->i_rcu, isofs_i_callback); 94 } 95 96 static void init_once(void *foo) 97 { 98 struct iso_inode_info *ei = foo; 99 100 inode_init_once(&ei->vfs_inode); 101 } 102 103 static int init_inodecache(void) 104 { 105 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", 106 sizeof(struct iso_inode_info), 107 0, (SLAB_RECLAIM_ACCOUNT| 108 SLAB_MEM_SPREAD), 109 init_once); 110 if (isofs_inode_cachep == NULL) 111 return -ENOMEM; 112 return 0; 113 } 114 115 static void destroy_inodecache(void) 116 { 117 kmem_cache_destroy(isofs_inode_cachep); 118 } 119 120 static int isofs_remount(struct super_block *sb, int *flags, char *data) 121 { 122 /* we probably want a lot more here */ 123 *flags |= MS_RDONLY; 124 return 0; 125 } 126 127 static const struct super_operations isofs_sops = { 128 .alloc_inode = isofs_alloc_inode, 129 .destroy_inode = isofs_destroy_inode, 130 .put_super = isofs_put_super, 131 .statfs = isofs_statfs, 132 .remount_fs = isofs_remount, 133 .show_options = generic_show_options, 134 }; 135 136 137 static const struct dentry_operations isofs_dentry_ops[] = { 138 { 139 .d_hash = isofs_hash, 140 .d_compare = isofs_dentry_cmp, 141 }, 142 { 143 .d_hash = isofs_hashi, 144 .d_compare = isofs_dentry_cmpi, 145 }, 146 #ifdef CONFIG_JOLIET 147 { 148 .d_hash = isofs_hash_ms, 149 .d_compare = isofs_dentry_cmp_ms, 150 }, 151 { 152 .d_hash = isofs_hashi_ms, 153 .d_compare = isofs_dentry_cmpi_ms, 154 }, 155 #endif 156 }; 157 158 struct iso9660_options{ 159 unsigned int rock:1; 160 unsigned int joliet:1; 161 unsigned int cruft:1; 162 unsigned int hide:1; 163 unsigned int showassoc:1; 164 unsigned int nocompress:1; 165 unsigned int overriderockperm:1; 166 unsigned int uid_set:1; 167 unsigned int gid_set:1; 168 unsigned int utf8:1; 169 unsigned char map; 170 unsigned char check; 171 unsigned int blocksize; 172 umode_t fmode; 173 umode_t dmode; 174 gid_t gid; 175 uid_t uid; 176 char *iocharset; 177 /* LVE */ 178 s32 session; 179 s32 sbsector; 180 }; 181 182 /* 183 * Compute the hash for the isofs name corresponding to the dentry. 184 */ 185 static int 186 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) 187 { 188 const char *name; 189 int len; 190 191 len = qstr->len; 192 name = qstr->name; 193 if (ms) { 194 while (len && name[len-1] == '.') 195 len--; 196 } 197 198 qstr->hash = full_name_hash(name, len); 199 200 return 0; 201 } 202 203 /* 204 * Compute the hash for the isofs name corresponding to the dentry. 205 */ 206 static int 207 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) 208 { 209 const char *name; 210 int len; 211 char c; 212 unsigned long hash; 213 214 len = qstr->len; 215 name = qstr->name; 216 if (ms) { 217 while (len && name[len-1] == '.') 218 len--; 219 } 220 221 hash = init_name_hash(); 222 while (len--) { 223 c = tolower(*name++); 224 hash = partial_name_hash(c, hash); 225 } 226 qstr->hash = end_name_hash(hash); 227 228 return 0; 229 } 230 231 /* 232 * Compare of two isofs names. 233 */ 234 static int isofs_dentry_cmp_common( 235 unsigned int len, const char *str, 236 const struct qstr *name, int ms, int ci) 237 { 238 int alen, blen; 239 240 /* A filename cannot end in '.' or we treat it like it has none */ 241 alen = name->len; 242 blen = len; 243 if (ms) { 244 while (alen && name->name[alen-1] == '.') 245 alen--; 246 while (blen && str[blen-1] == '.') 247 blen--; 248 } 249 if (alen == blen) { 250 if (ci) { 251 if (strnicmp(name->name, str, alen) == 0) 252 return 0; 253 } else { 254 if (strncmp(name->name, str, alen) == 0) 255 return 0; 256 } 257 } 258 return 1; 259 } 260 261 static int 262 isofs_hash(const struct dentry *dentry, const struct inode *inode, 263 struct qstr *qstr) 264 { 265 return isofs_hash_common(dentry, qstr, 0); 266 } 267 268 static int 269 isofs_hashi(const struct dentry *dentry, const struct inode *inode, 270 struct qstr *qstr) 271 { 272 return isofs_hashi_common(dentry, qstr, 0); 273 } 274 275 static int 276 isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode, 277 const struct dentry *dentry, const struct inode *inode, 278 unsigned int len, const char *str, const struct qstr *name) 279 { 280 return isofs_dentry_cmp_common(len, str, name, 0, 0); 281 } 282 283 static int 284 isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode, 285 const struct dentry *dentry, const struct inode *inode, 286 unsigned int len, const char *str, const struct qstr *name) 287 { 288 return isofs_dentry_cmp_common(len, str, name, 0, 1); 289 } 290 291 #ifdef CONFIG_JOLIET 292 static int 293 isofs_hash_ms(const struct dentry *dentry, const struct inode *inode, 294 struct qstr *qstr) 295 { 296 return isofs_hash_common(dentry, qstr, 1); 297 } 298 299 static int 300 isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode, 301 struct qstr *qstr) 302 { 303 return isofs_hashi_common(dentry, qstr, 1); 304 } 305 306 static int 307 isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode, 308 const struct dentry *dentry, const struct inode *inode, 309 unsigned int len, const char *str, const struct qstr *name) 310 { 311 return isofs_dentry_cmp_common(len, str, name, 1, 0); 312 } 313 314 static int 315 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode, 316 const struct dentry *dentry, const struct inode *inode, 317 unsigned int len, const char *str, const struct qstr *name) 318 { 319 return isofs_dentry_cmp_common(len, str, name, 1, 1); 320 } 321 #endif 322 323 enum { 324 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, 325 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, 326 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, 327 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, 328 }; 329 330 static const match_table_t tokens = { 331 {Opt_norock, "norock"}, 332 {Opt_nojoliet, "nojoliet"}, 333 {Opt_unhide, "unhide"}, 334 {Opt_hide, "hide"}, 335 {Opt_showassoc, "showassoc"}, 336 {Opt_cruft, "cruft"}, 337 {Opt_utf8, "utf8"}, 338 {Opt_iocharset, "iocharset=%s"}, 339 {Opt_map_a, "map=acorn"}, 340 {Opt_map_a, "map=a"}, 341 {Opt_map_n, "map=normal"}, 342 {Opt_map_n, "map=n"}, 343 {Opt_map_o, "map=off"}, 344 {Opt_map_o, "map=o"}, 345 {Opt_session, "session=%u"}, 346 {Opt_sb, "sbsector=%u"}, 347 {Opt_check_r, "check=relaxed"}, 348 {Opt_check_r, "check=r"}, 349 {Opt_check_s, "check=strict"}, 350 {Opt_check_s, "check=s"}, 351 {Opt_uid, "uid=%u"}, 352 {Opt_gid, "gid=%u"}, 353 {Opt_mode, "mode=%u"}, 354 {Opt_dmode, "dmode=%u"}, 355 {Opt_overriderockperm, "overriderockperm"}, 356 {Opt_block, "block=%u"}, 357 {Opt_ignore, "conv=binary"}, 358 {Opt_ignore, "conv=b"}, 359 {Opt_ignore, "conv=text"}, 360 {Opt_ignore, "conv=t"}, 361 {Opt_ignore, "conv=mtext"}, 362 {Opt_ignore, "conv=m"}, 363 {Opt_ignore, "conv=auto"}, 364 {Opt_ignore, "conv=a"}, 365 {Opt_nocompress, "nocompress"}, 366 {Opt_err, NULL} 367 }; 368 369 static int parse_options(char *options, struct iso9660_options *popt) 370 { 371 char *p; 372 int option; 373 374 popt->map = 'n'; 375 popt->rock = 1; 376 popt->joliet = 1; 377 popt->cruft = 0; 378 popt->hide = 0; 379 popt->showassoc = 0; 380 popt->check = 'u'; /* unset */ 381 popt->nocompress = 0; 382 popt->blocksize = 1024; 383 popt->fmode = popt->dmode = ISOFS_INVALID_MODE; 384 popt->uid_set = 0; 385 popt->gid_set = 0; 386 popt->gid = 0; 387 popt->uid = 0; 388 popt->iocharset = NULL; 389 popt->utf8 = 0; 390 popt->overriderockperm = 0; 391 popt->session=-1; 392 popt->sbsector=-1; 393 if (!options) 394 return 1; 395 396 while ((p = strsep(&options, ",")) != NULL) { 397 int token; 398 substring_t args[MAX_OPT_ARGS]; 399 unsigned n; 400 401 if (!*p) 402 continue; 403 404 token = match_token(p, tokens, args); 405 switch (token) { 406 case Opt_norock: 407 popt->rock = 0; 408 break; 409 case Opt_nojoliet: 410 popt->joliet = 0; 411 break; 412 case Opt_hide: 413 popt->hide = 1; 414 break; 415 case Opt_unhide: 416 case Opt_showassoc: 417 popt->showassoc = 1; 418 break; 419 case Opt_cruft: 420 popt->cruft = 1; 421 break; 422 case Opt_utf8: 423 popt->utf8 = 1; 424 break; 425 #ifdef CONFIG_JOLIET 426 case Opt_iocharset: 427 popt->iocharset = match_strdup(&args[0]); 428 break; 429 #endif 430 case Opt_map_a: 431 popt->map = 'a'; 432 break; 433 case Opt_map_o: 434 popt->map = 'o'; 435 break; 436 case Opt_map_n: 437 popt->map = 'n'; 438 break; 439 case Opt_session: 440 if (match_int(&args[0], &option)) 441 return 0; 442 n = option; 443 if (n > 99) 444 return 0; 445 popt->session = n + 1; 446 break; 447 case Opt_sb: 448 if (match_int(&args[0], &option)) 449 return 0; 450 popt->sbsector = option; 451 break; 452 case Opt_check_r: 453 popt->check = 'r'; 454 break; 455 case Opt_check_s: 456 popt->check = 's'; 457 break; 458 case Opt_ignore: 459 break; 460 case Opt_uid: 461 if (match_int(&args[0], &option)) 462 return 0; 463 popt->uid = option; 464 popt->uid_set = 1; 465 break; 466 case Opt_gid: 467 if (match_int(&args[0], &option)) 468 return 0; 469 popt->gid = option; 470 popt->gid_set = 1; 471 break; 472 case Opt_mode: 473 if (match_int(&args[0], &option)) 474 return 0; 475 popt->fmode = option; 476 break; 477 case Opt_dmode: 478 if (match_int(&args[0], &option)) 479 return 0; 480 popt->dmode = option; 481 break; 482 case Opt_overriderockperm: 483 popt->overriderockperm = 1; 484 break; 485 case Opt_block: 486 if (match_int(&args[0], &option)) 487 return 0; 488 n = option; 489 if (n != 512 && n != 1024 && n != 2048) 490 return 0; 491 popt->blocksize = n; 492 break; 493 case Opt_nocompress: 494 popt->nocompress = 1; 495 break; 496 default: 497 return 0; 498 } 499 } 500 return 1; 501 } 502 503 /* 504 * look if the driver can tell the multi session redirection value 505 * 506 * don't change this if you don't know what you do, please! 507 * Multisession is legal only with XA disks. 508 * A non-XA disk with more than one volume descriptor may do it right, but 509 * usually is written in a nowhere standardized "multi-partition" manner. 510 * Multisession uses absolute addressing (solely the first frame of the whole 511 * track is #0), multi-partition uses relative addressing (each first frame of 512 * each track is #0), and a track is not a session. 513 * 514 * A broken CDwriter software or drive firmware does not set new standards, 515 * at least not if conflicting with the existing ones. 516 * 517 * emoenke@gwdg.de 518 */ 519 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 520 521 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 522 { 523 struct cdrom_multisession ms_info; 524 unsigned int vol_desc_start; 525 struct block_device *bdev = sb->s_bdev; 526 int i; 527 528 vol_desc_start=0; 529 ms_info.addr_format=CDROM_LBA; 530 if(session >= 0 && session <= 99) { 531 struct cdrom_tocentry Te; 532 Te.cdte_track=session; 533 Te.cdte_format=CDROM_LBA; 534 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); 535 if (!i) { 536 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 537 session, Te.cdte_addr.lba, 538 Te.cdte_ctrl&CDROM_DATA_TRACK); 539 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) 540 return Te.cdte_addr.lba; 541 } 542 543 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 544 } 545 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); 546 if (session > 0) 547 printk(KERN_ERR "ISOFS: Invalid session number\n"); 548 #if 0 549 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); 550 if (i==0) { 551 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); 552 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); 553 } 554 #endif 555 if (i==0) 556 #if WE_OBEY_THE_WRITTEN_STANDARDS 557 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ 558 #endif 559 vol_desc_start=ms_info.addr.lba; 560 return vol_desc_start; 561 } 562 563 /* 564 * Check if root directory is empty (has less than 3 files). 565 * 566 * Used to detect broken CDs where ISO root directory is empty but Joliet root 567 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 568 * (and Joliet used instead) or else no files would be visible. 569 */ 570 static bool rootdir_empty(struct super_block *sb, unsigned long block) 571 { 572 int offset = 0, files = 0, de_len; 573 struct iso_directory_record *de; 574 struct buffer_head *bh; 575 576 bh = sb_bread(sb, block); 577 if (!bh) 578 return true; 579 while (files < 3) { 580 de = (struct iso_directory_record *) (bh->b_data + offset); 581 de_len = *(unsigned char *) de; 582 if (de_len == 0) 583 break; 584 files++; 585 offset += de_len; 586 } 587 brelse(bh); 588 return files < 3; 589 } 590 591 /* 592 * Initialize the superblock and read the root inode. 593 * 594 * Note: a check_disk_change() has been done immediately prior 595 * to this call, so we don't need to check again. 596 */ 597 static int isofs_fill_super(struct super_block *s, void *data, int silent) 598 { 599 struct buffer_head *bh = NULL, *pri_bh = NULL; 600 struct hs_primary_descriptor *h_pri = NULL; 601 struct iso_primary_descriptor *pri = NULL; 602 struct iso_supplementary_descriptor *sec = NULL; 603 struct iso_directory_record *rootp; 604 struct inode *inode; 605 struct iso9660_options opt; 606 struct isofs_sb_info *sbi; 607 unsigned long first_data_zone; 608 int joliet_level = 0; 609 int iso_blknum, block; 610 int orig_zonesize; 611 int table, error = -EINVAL; 612 unsigned int vol_desc_start; 613 614 save_mount_options(s, data); 615 616 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 617 if (!sbi) 618 return -ENOMEM; 619 s->s_fs_info = sbi; 620 621 if (!parse_options((char *)data, &opt)) 622 goto out_freesbi; 623 624 /* 625 * First of all, get the hardware blocksize for this device. 626 * If we don't know what it is, or the hardware blocksize is 627 * larger than the blocksize the user specified, then use 628 * that value. 629 */ 630 /* 631 * What if bugger tells us to go beyond page size? 632 */ 633 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 634 635 sbi->s_high_sierra = 0; /* default is iso9660 */ 636 637 vol_desc_start = (opt.sbsector != -1) ? 638 opt.sbsector : isofs_get_last_session(s,opt.session); 639 640 for (iso_blknum = vol_desc_start+16; 641 iso_blknum < vol_desc_start+100; iso_blknum++) { 642 struct hs_volume_descriptor *hdp; 643 struct iso_volume_descriptor *vdp; 644 645 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 646 if (!(bh = sb_bread(s, block))) 647 goto out_no_read; 648 649 vdp = (struct iso_volume_descriptor *)bh->b_data; 650 hdp = (struct hs_volume_descriptor *)bh->b_data; 651 652 /* 653 * Due to the overlapping physical location of the descriptors, 654 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 655 * proper identification in this case, we first check for ISO. 656 */ 657 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 658 if (isonum_711(vdp->type) == ISO_VD_END) 659 break; 660 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 661 if (pri == NULL) { 662 pri = (struct iso_primary_descriptor *)vdp; 663 /* Save the buffer in case we need it ... */ 664 pri_bh = bh; 665 bh = NULL; 666 } 667 } 668 #ifdef CONFIG_JOLIET 669 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 670 sec = (struct iso_supplementary_descriptor *)vdp; 671 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 672 if (opt.joliet) { 673 if (sec->escape[2] == 0x40) 674 joliet_level = 1; 675 else if (sec->escape[2] == 0x43) 676 joliet_level = 2; 677 else if (sec->escape[2] == 0x45) 678 joliet_level = 3; 679 680 printk(KERN_DEBUG "ISO 9660 Extensions: " 681 "Microsoft Joliet Level %d\n", 682 joliet_level); 683 } 684 goto root_found; 685 } else { 686 /* Unknown supplementary volume descriptor */ 687 sec = NULL; 688 } 689 } 690 #endif 691 } else { 692 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 693 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 694 goto out_freebh; 695 696 sbi->s_high_sierra = 1; 697 opt.rock = 0; 698 h_pri = (struct hs_primary_descriptor *)vdp; 699 goto root_found; 700 } 701 } 702 703 /* Just skip any volume descriptors we don't recognize */ 704 705 brelse(bh); 706 bh = NULL; 707 } 708 /* 709 * If we fall through, either no volume descriptor was found, 710 * or else we passed a primary descriptor looking for others. 711 */ 712 if (!pri) 713 goto out_unknown_format; 714 brelse(bh); 715 bh = pri_bh; 716 pri_bh = NULL; 717 718 root_found: 719 720 if (joliet_level && (pri == NULL || !opt.rock)) { 721 /* This is the case of Joliet with the norock mount flag. 722 * A disc with both Joliet and Rock Ridge is handled later 723 */ 724 pri = (struct iso_primary_descriptor *) sec; 725 } 726 727 if(sbi->s_high_sierra){ 728 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 729 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 730 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 731 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 732 } else { 733 if (!pri) 734 goto out_freebh; 735 rootp = (struct iso_directory_record *) pri->root_directory_record; 736 sbi->s_nzones = isonum_733(pri->volume_space_size); 737 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 738 sbi->s_max_size = isonum_733(pri->volume_space_size); 739 } 740 741 sbi->s_ninodes = 0; /* No way to figure this out easily */ 742 743 orig_zonesize = sbi->s_log_zone_size; 744 /* 745 * If the zone size is smaller than the hardware sector size, 746 * this is a fatal error. This would occur if the disc drive 747 * had sectors that were 2048 bytes, but the filesystem had 748 * blocks that were 512 bytes (which should only very rarely 749 * happen.) 750 */ 751 if (orig_zonesize < opt.blocksize) 752 goto out_bad_size; 753 754 /* RDE: convert log zone size to bit shift */ 755 switch (sbi->s_log_zone_size) { 756 case 512: sbi->s_log_zone_size = 9; break; 757 case 1024: sbi->s_log_zone_size = 10; break; 758 case 2048: sbi->s_log_zone_size = 11; break; 759 760 default: 761 goto out_bad_zone_size; 762 } 763 764 s->s_magic = ISOFS_SUPER_MAGIC; 765 766 /* 767 * With multi-extent files, file size is only limited by the maximum 768 * size of a file system, which is 8 TB. 769 */ 770 s->s_maxbytes = 0x80000000000LL; 771 772 /* 773 * The CDROM is read-only, has no nodes (devices) on it, and since 774 * all of the files appear to be owned by root, we really do not want 775 * to allow suid. (suid or devices will not show up unless we have 776 * Rock Ridge extensions) 777 */ 778 779 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */; 780 781 /* Set this for reference. Its not currently used except on write 782 which we don't have .. */ 783 784 first_data_zone = isonum_733(rootp->extent) + 785 isonum_711(rootp->ext_attr_length); 786 sbi->s_firstdatazone = first_data_zone; 787 #ifndef BEQUIET 788 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 789 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 790 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 791 if(sbi->s_high_sierra) 792 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 793 #endif 794 795 /* 796 * If the Joliet level is set, we _may_ decide to use the 797 * secondary descriptor, but can't be sure until after we 798 * read the root inode. But before reading the root inode 799 * we may need to change the device blocksize, and would 800 * rather release the old buffer first. So, we cache the 801 * first_data_zone value from the secondary descriptor. 802 */ 803 if (joliet_level) { 804 pri = (struct iso_primary_descriptor *) sec; 805 rootp = (struct iso_directory_record *) 806 pri->root_directory_record; 807 first_data_zone = isonum_733(rootp->extent) + 808 isonum_711(rootp->ext_attr_length); 809 } 810 811 /* 812 * We're all done using the volume descriptor, and may need 813 * to change the device blocksize, so release the buffer now. 814 */ 815 brelse(pri_bh); 816 brelse(bh); 817 818 /* 819 * Force the blocksize to 512 for 512 byte sectors. The file 820 * read primitives really get it wrong in a bad way if we don't 821 * do this. 822 * 823 * Note - we should never be setting the blocksize to something 824 * less than the hardware sector size for the device. If we 825 * do, we would end up having to read larger buffers and split 826 * out portions to satisfy requests. 827 * 828 * Note2- the idea here is that we want to deal with the optimal 829 * zonesize in the filesystem. If we have it set to something less, 830 * then we have horrible problems with trying to piece together 831 * bits of adjacent blocks in order to properly read directory 832 * entries. By forcing the blocksize in this way, we ensure 833 * that we will never be required to do this. 834 */ 835 sb_set_blocksize(s, orig_zonesize); 836 837 sbi->s_nls_iocharset = NULL; 838 839 #ifdef CONFIG_JOLIET 840 if (joliet_level && opt.utf8 == 0) { 841 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 842 sbi->s_nls_iocharset = load_nls(p); 843 if (! sbi->s_nls_iocharset) { 844 /* Fail only if explicit charset specified */ 845 if (opt.iocharset) 846 goto out_freesbi; 847 sbi->s_nls_iocharset = load_nls_default(); 848 } 849 } 850 #endif 851 s->s_op = &isofs_sops; 852 s->s_export_op = &isofs_export_ops; 853 sbi->s_mapping = opt.map; 854 sbi->s_rock = (opt.rock ? 2 : 0); 855 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 856 sbi->s_cruft = opt.cruft; 857 sbi->s_hide = opt.hide; 858 sbi->s_showassoc = opt.showassoc; 859 sbi->s_uid = opt.uid; 860 sbi->s_gid = opt.gid; 861 sbi->s_uid_set = opt.uid_set; 862 sbi->s_gid_set = opt.gid_set; 863 sbi->s_utf8 = opt.utf8; 864 sbi->s_nocompress = opt.nocompress; 865 sbi->s_overriderockperm = opt.overriderockperm; 866 /* 867 * It would be incredibly stupid to allow people to mark every file 868 * on the disk as suid, so we merely allow them to set the default 869 * permissions. 870 */ 871 if (opt.fmode != ISOFS_INVALID_MODE) 872 sbi->s_fmode = opt.fmode & 0777; 873 else 874 sbi->s_fmode = ISOFS_INVALID_MODE; 875 if (opt.dmode != ISOFS_INVALID_MODE) 876 sbi->s_dmode = opt.dmode & 0777; 877 else 878 sbi->s_dmode = ISOFS_INVALID_MODE; 879 880 /* 881 * Read the root inode, which _may_ result in changing 882 * the s_rock flag. Once we have the final s_rock value, 883 * we then decide whether to use the Joliet descriptor. 884 */ 885 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 886 if (IS_ERR(inode)) 887 goto out_no_root; 888 889 /* 890 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 891 * correct Joliet root directory. 892 */ 893 if (sbi->s_rock == 1 && joliet_level && 894 rootdir_empty(s, sbi->s_firstdatazone)) { 895 printk(KERN_NOTICE 896 "ISOFS: primary root directory is empty. " 897 "Disabling Rock Ridge and switching to Joliet."); 898 sbi->s_rock = 0; 899 } 900 901 /* 902 * If this disk has both Rock Ridge and Joliet on it, then we 903 * want to use Rock Ridge by default. This can be overridden 904 * by using the norock mount option. There is still one other 905 * possibility that is not taken into account: a Rock Ridge 906 * CD with Unicode names. Until someone sees such a beast, it 907 * will not be supported. 908 */ 909 if (sbi->s_rock == 1) { 910 joliet_level = 0; 911 } else if (joliet_level) { 912 sbi->s_rock = 0; 913 if (sbi->s_firstdatazone != first_data_zone) { 914 sbi->s_firstdatazone = first_data_zone; 915 printk(KERN_DEBUG 916 "ISOFS: changing to secondary root\n"); 917 iput(inode); 918 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 919 if (IS_ERR(inode)) 920 goto out_no_root; 921 } 922 } 923 924 if (opt.check == 'u') { 925 /* Only Joliet is case insensitive by default */ 926 if (joliet_level) 927 opt.check = 'r'; 928 else 929 opt.check = 's'; 930 } 931 sbi->s_joliet_level = joliet_level; 932 933 /* Make sure the root inode is a directory */ 934 if (!S_ISDIR(inode->i_mode)) { 935 printk(KERN_WARNING 936 "isofs_fill_super: root inode is not a directory. " 937 "Corrupted media?\n"); 938 goto out_iput; 939 } 940 941 table = 0; 942 if (joliet_level) 943 table += 2; 944 if (opt.check == 'r') 945 table++; 946 947 s->s_d_op = &isofs_dentry_ops[table]; 948 949 /* get the root dentry */ 950 s->s_root = d_make_root(inode); 951 if (!(s->s_root)) { 952 error = -ENOMEM; 953 goto out_no_inode; 954 } 955 956 kfree(opt.iocharset); 957 958 return 0; 959 960 /* 961 * Display error messages and free resources. 962 */ 963 out_iput: 964 iput(inode); 965 goto out_no_inode; 966 out_no_root: 967 error = PTR_ERR(inode); 968 if (error != -ENOMEM) 969 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 970 out_no_inode: 971 #ifdef CONFIG_JOLIET 972 unload_nls(sbi->s_nls_iocharset); 973 #endif 974 goto out_freesbi; 975 out_no_read: 976 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 977 __func__, s->s_id, iso_blknum, block); 978 goto out_freebh; 979 out_bad_zone_size: 980 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 981 sbi->s_log_zone_size); 982 goto out_freebh; 983 out_bad_size: 984 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 985 orig_zonesize, opt.blocksize); 986 goto out_freebh; 987 out_unknown_format: 988 if (!silent) 989 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 990 991 out_freebh: 992 brelse(bh); 993 brelse(pri_bh); 994 out_freesbi: 995 kfree(opt.iocharset); 996 kfree(sbi); 997 s->s_fs_info = NULL; 998 return error; 999 } 1000 1001 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1002 { 1003 struct super_block *sb = dentry->d_sb; 1004 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1005 1006 buf->f_type = ISOFS_SUPER_MAGIC; 1007 buf->f_bsize = sb->s_blocksize; 1008 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1009 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1010 buf->f_bfree = 0; 1011 buf->f_bavail = 0; 1012 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1013 buf->f_ffree = 0; 1014 buf->f_fsid.val[0] = (u32)id; 1015 buf->f_fsid.val[1] = (u32)(id >> 32); 1016 buf->f_namelen = NAME_MAX; 1017 return 0; 1018 } 1019 1020 /* 1021 * Get a set of blocks; filling in buffer_heads if already allocated 1022 * or getblk() if they are not. Returns the number of blocks inserted 1023 * (-ve == error.) 1024 */ 1025 int isofs_get_blocks(struct inode *inode, sector_t iblock, 1026 struct buffer_head **bh, unsigned long nblocks) 1027 { 1028 unsigned long b_off = iblock; 1029 unsigned offset, sect_size; 1030 unsigned int firstext; 1031 unsigned long nextblk, nextoff; 1032 int section, rv, error; 1033 struct iso_inode_info *ei = ISOFS_I(inode); 1034 1035 error = -EIO; 1036 rv = 0; 1037 if (iblock != b_off) { 1038 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1039 goto abort; 1040 } 1041 1042 1043 offset = 0; 1044 firstext = ei->i_first_extent; 1045 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1046 nextblk = ei->i_next_section_block; 1047 nextoff = ei->i_next_section_offset; 1048 section = 0; 1049 1050 while (nblocks) { 1051 /* If we are *way* beyond the end of the file, print a message. 1052 * Access beyond the end of the file up to the next page boundary 1053 * is normal, however because of the way the page cache works. 1054 * In this case, we just return 0 so that we can properly fill 1055 * the page with useless information without generating any 1056 * I/O errors. 1057 */ 1058 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1059 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1060 __func__, b_off, 1061 (unsigned long long)inode->i_size); 1062 goto abort; 1063 } 1064 1065 /* On the last section, nextblk == 0, section size is likely to 1066 * exceed sect_size by a partial block, and access beyond the 1067 * end of the file will reach beyond the section size, too. 1068 */ 1069 while (nextblk && (b_off >= (offset + sect_size))) { 1070 struct inode *ninode; 1071 1072 offset += sect_size; 1073 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1074 if (IS_ERR(ninode)) { 1075 error = PTR_ERR(ninode); 1076 goto abort; 1077 } 1078 firstext = ISOFS_I(ninode)->i_first_extent; 1079 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1080 nextblk = ISOFS_I(ninode)->i_next_section_block; 1081 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1082 iput(ninode); 1083 1084 if (++section > 100) { 1085 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1086 " aborting...\n", __func__); 1087 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1088 "nextblk=%lu nextoff=%lu\n", __func__, 1089 b_off, firstext, (unsigned) sect_size, 1090 nextblk, nextoff); 1091 goto abort; 1092 } 1093 } 1094 1095 if (*bh) { 1096 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1097 } else { 1098 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1099 if (!*bh) 1100 goto abort; 1101 } 1102 bh++; /* Next buffer head */ 1103 b_off++; /* Next buffer offset */ 1104 nblocks--; 1105 rv++; 1106 } 1107 1108 error = 0; 1109 abort: 1110 return rv != 0 ? rv : error; 1111 } 1112 1113 /* 1114 * Used by the standard interfaces. 1115 */ 1116 static int isofs_get_block(struct inode *inode, sector_t iblock, 1117 struct buffer_head *bh_result, int create) 1118 { 1119 int ret; 1120 1121 if (create) { 1122 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1123 return -EROFS; 1124 } 1125 1126 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1127 return ret < 0 ? ret : 0; 1128 } 1129 1130 static int isofs_bmap(struct inode *inode, sector_t block) 1131 { 1132 struct buffer_head dummy; 1133 int error; 1134 1135 dummy.b_state = 0; 1136 dummy.b_blocknr = -1000; 1137 error = isofs_get_block(inode, block, &dummy, 0); 1138 if (!error) 1139 return dummy.b_blocknr; 1140 return 0; 1141 } 1142 1143 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1144 { 1145 sector_t blknr = isofs_bmap(inode, block); 1146 if (!blknr) 1147 return NULL; 1148 return sb_bread(inode->i_sb, blknr); 1149 } 1150 1151 static int isofs_readpage(struct file *file, struct page *page) 1152 { 1153 return mpage_readpage(page, isofs_get_block); 1154 } 1155 1156 static int isofs_readpages(struct file *file, struct address_space *mapping, 1157 struct list_head *pages, unsigned nr_pages) 1158 { 1159 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); 1160 } 1161 1162 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1163 { 1164 return generic_block_bmap(mapping,block,isofs_get_block); 1165 } 1166 1167 static const struct address_space_operations isofs_aops = { 1168 .readpage = isofs_readpage, 1169 .readpages = isofs_readpages, 1170 .bmap = _isofs_bmap 1171 }; 1172 1173 static int isofs_read_level3_size(struct inode *inode) 1174 { 1175 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1176 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1177 struct buffer_head *bh = NULL; 1178 unsigned long block, offset, block_saved, offset_saved; 1179 int i = 0; 1180 int more_entries = 0; 1181 struct iso_directory_record *tmpde = NULL; 1182 struct iso_inode_info *ei = ISOFS_I(inode); 1183 1184 inode->i_size = 0; 1185 1186 /* The first 16 blocks are reserved as the System Area. Thus, 1187 * no inodes can appear in block 0. We use this to flag that 1188 * this is the last section. */ 1189 ei->i_next_section_block = 0; 1190 ei->i_next_section_offset = 0; 1191 1192 block = ei->i_iget5_block; 1193 offset = ei->i_iget5_offset; 1194 1195 do { 1196 struct iso_directory_record *de; 1197 unsigned int de_len; 1198 1199 if (!bh) { 1200 bh = sb_bread(inode->i_sb, block); 1201 if (!bh) 1202 goto out_noread; 1203 } 1204 de = (struct iso_directory_record *) (bh->b_data + offset); 1205 de_len = *(unsigned char *) de; 1206 1207 if (de_len == 0) { 1208 brelse(bh); 1209 bh = NULL; 1210 ++block; 1211 offset = 0; 1212 continue; 1213 } 1214 1215 block_saved = block; 1216 offset_saved = offset; 1217 offset += de_len; 1218 1219 /* Make sure we have a full directory entry */ 1220 if (offset >= bufsize) { 1221 int slop = bufsize - offset + de_len; 1222 if (!tmpde) { 1223 tmpde = kmalloc(256, GFP_KERNEL); 1224 if (!tmpde) 1225 goto out_nomem; 1226 } 1227 memcpy(tmpde, de, slop); 1228 offset &= bufsize - 1; 1229 block++; 1230 brelse(bh); 1231 bh = NULL; 1232 if (offset) { 1233 bh = sb_bread(inode->i_sb, block); 1234 if (!bh) 1235 goto out_noread; 1236 memcpy((void *)tmpde+slop, bh->b_data, offset); 1237 } 1238 de = tmpde; 1239 } 1240 1241 inode->i_size += isonum_733(de->size); 1242 if (i == 1) { 1243 ei->i_next_section_block = block_saved; 1244 ei->i_next_section_offset = offset_saved; 1245 } 1246 1247 more_entries = de->flags[-high_sierra] & 0x80; 1248 1249 i++; 1250 if (i > 100) 1251 goto out_toomany; 1252 } while (more_entries); 1253 out: 1254 kfree(tmpde); 1255 if (bh) 1256 brelse(bh); 1257 return 0; 1258 1259 out_nomem: 1260 if (bh) 1261 brelse(bh); 1262 return -ENOMEM; 1263 1264 out_noread: 1265 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1266 kfree(tmpde); 1267 return -EIO; 1268 1269 out_toomany: 1270 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1271 "isofs_read_level3_size: inode=%lu\n", 1272 __func__, inode->i_ino); 1273 goto out; 1274 } 1275 1276 static int isofs_read_inode(struct inode *inode) 1277 { 1278 struct super_block *sb = inode->i_sb; 1279 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1280 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1281 unsigned long block; 1282 int high_sierra = sbi->s_high_sierra; 1283 struct buffer_head *bh = NULL; 1284 struct iso_directory_record *de; 1285 struct iso_directory_record *tmpde = NULL; 1286 unsigned int de_len; 1287 unsigned long offset; 1288 struct iso_inode_info *ei = ISOFS_I(inode); 1289 int ret = -EIO; 1290 1291 block = ei->i_iget5_block; 1292 bh = sb_bread(inode->i_sb, block); 1293 if (!bh) 1294 goto out_badread; 1295 1296 offset = ei->i_iget5_offset; 1297 1298 de = (struct iso_directory_record *) (bh->b_data + offset); 1299 de_len = *(unsigned char *) de; 1300 1301 if (offset + de_len > bufsize) { 1302 int frag1 = bufsize - offset; 1303 1304 tmpde = kmalloc(de_len, GFP_KERNEL); 1305 if (tmpde == NULL) { 1306 printk(KERN_INFO "%s: out of memory\n", __func__); 1307 ret = -ENOMEM; 1308 goto fail; 1309 } 1310 memcpy(tmpde, bh->b_data + offset, frag1); 1311 brelse(bh); 1312 bh = sb_bread(inode->i_sb, ++block); 1313 if (!bh) 1314 goto out_badread; 1315 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1316 de = tmpde; 1317 } 1318 1319 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1320 ei->i_iget5_offset, 1321 ISOFS_BUFFER_BITS(inode)); 1322 1323 /* Assume it is a normal-format file unless told otherwise */ 1324 ei->i_file_format = isofs_file_normal; 1325 1326 if (de->flags[-high_sierra] & 2) { 1327 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1328 inode->i_mode = S_IFDIR | sbi->s_dmode; 1329 else 1330 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1331 set_nlink(inode, 1); /* 1332 * Set to 1. We know there are 2, but 1333 * the find utility tries to optimize 1334 * if it is 2, and it screws up. It is 1335 * easier to give 1 which tells find to 1336 * do it the hard way. 1337 */ 1338 } else { 1339 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1340 inode->i_mode = S_IFREG | sbi->s_fmode; 1341 } else { 1342 /* 1343 * Set default permissions: r-x for all. The disc 1344 * could be shared with DOS machines so virtually 1345 * anything could be a valid executable. 1346 */ 1347 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1348 } 1349 set_nlink(inode, 1); 1350 } 1351 inode->i_uid = sbi->s_uid; 1352 inode->i_gid = sbi->s_gid; 1353 inode->i_blocks = 0; 1354 1355 ei->i_format_parm[0] = 0; 1356 ei->i_format_parm[1] = 0; 1357 ei->i_format_parm[2] = 0; 1358 1359 ei->i_section_size = isonum_733(de->size); 1360 if (de->flags[-high_sierra] & 0x80) { 1361 ret = isofs_read_level3_size(inode); 1362 if (ret < 0) 1363 goto fail; 1364 ret = -EIO; 1365 } else { 1366 ei->i_next_section_block = 0; 1367 ei->i_next_section_offset = 0; 1368 inode->i_size = isonum_733(de->size); 1369 } 1370 1371 /* 1372 * Some dipshit decided to store some other bit of information 1373 * in the high byte of the file length. Truncate size in case 1374 * this CDROM was mounted with the cruft option. 1375 */ 1376 1377 if (sbi->s_cruft) 1378 inode->i_size &= 0x00ffffff; 1379 1380 if (de->interleave[0]) { 1381 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1382 inode->i_size = 0; 1383 } 1384 1385 /* I have no idea what file_unit_size is used for, so 1386 we will flag it for now */ 1387 if (de->file_unit_size[0] != 0) { 1388 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1389 inode->i_ino); 1390 } 1391 1392 /* I have no idea what other flag bits are used for, so 1393 we will flag it for now */ 1394 #ifdef DEBUG 1395 if((de->flags[-high_sierra] & ~2)!= 0){ 1396 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1397 "(%ld %x).\n", 1398 inode->i_ino, de->flags[-high_sierra]); 1399 } 1400 #endif 1401 1402 inode->i_mtime.tv_sec = 1403 inode->i_atime.tv_sec = 1404 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1405 inode->i_mtime.tv_nsec = 1406 inode->i_atime.tv_nsec = 1407 inode->i_ctime.tv_nsec = 0; 1408 1409 ei->i_first_extent = (isonum_733(de->extent) + 1410 isonum_711(de->ext_attr_length)); 1411 1412 /* Set the number of blocks for stat() - should be done before RR */ 1413 inode->i_blocks = (inode->i_size + 511) >> 9; 1414 1415 /* 1416 * Now test for possible Rock Ridge extensions which will override 1417 * some of these numbers in the inode structure. 1418 */ 1419 1420 if (!high_sierra) { 1421 parse_rock_ridge_inode(de, inode); 1422 /* if we want uid/gid set, override the rock ridge setting */ 1423 if (sbi->s_uid_set) 1424 inode->i_uid = sbi->s_uid; 1425 if (sbi->s_gid_set) 1426 inode->i_gid = sbi->s_gid; 1427 } 1428 /* Now set final access rights if overriding rock ridge setting */ 1429 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1430 sbi->s_dmode != ISOFS_INVALID_MODE) 1431 inode->i_mode = S_IFDIR | sbi->s_dmode; 1432 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1433 sbi->s_fmode != ISOFS_INVALID_MODE) 1434 inode->i_mode = S_IFREG | sbi->s_fmode; 1435 1436 /* Install the inode operations vector */ 1437 if (S_ISREG(inode->i_mode)) { 1438 inode->i_fop = &generic_ro_fops; 1439 switch (ei->i_file_format) { 1440 #ifdef CONFIG_ZISOFS 1441 case isofs_file_compressed: 1442 inode->i_data.a_ops = &zisofs_aops; 1443 break; 1444 #endif 1445 default: 1446 inode->i_data.a_ops = &isofs_aops; 1447 break; 1448 } 1449 } else if (S_ISDIR(inode->i_mode)) { 1450 inode->i_op = &isofs_dir_inode_operations; 1451 inode->i_fop = &isofs_dir_operations; 1452 } else if (S_ISLNK(inode->i_mode)) { 1453 inode->i_op = &page_symlink_inode_operations; 1454 inode->i_data.a_ops = &isofs_symlink_aops; 1455 } else 1456 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1457 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1458 1459 ret = 0; 1460 out: 1461 kfree(tmpde); 1462 if (bh) 1463 brelse(bh); 1464 return ret; 1465 1466 out_badread: 1467 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1468 fail: 1469 goto out; 1470 } 1471 1472 struct isofs_iget5_callback_data { 1473 unsigned long block; 1474 unsigned long offset; 1475 }; 1476 1477 static int isofs_iget5_test(struct inode *ino, void *data) 1478 { 1479 struct iso_inode_info *i = ISOFS_I(ino); 1480 struct isofs_iget5_callback_data *d = 1481 (struct isofs_iget5_callback_data*)data; 1482 return (i->i_iget5_block == d->block) 1483 && (i->i_iget5_offset == d->offset); 1484 } 1485 1486 static int isofs_iget5_set(struct inode *ino, void *data) 1487 { 1488 struct iso_inode_info *i = ISOFS_I(ino); 1489 struct isofs_iget5_callback_data *d = 1490 (struct isofs_iget5_callback_data*)data; 1491 i->i_iget5_block = d->block; 1492 i->i_iget5_offset = d->offset; 1493 return 0; 1494 } 1495 1496 /* Store, in the inode's containing structure, the block and block 1497 * offset that point to the underlying meta-data for the inode. The 1498 * code below is otherwise similar to the iget() code in 1499 * include/linux/fs.h */ 1500 struct inode *isofs_iget(struct super_block *sb, 1501 unsigned long block, 1502 unsigned long offset) 1503 { 1504 unsigned long hashval; 1505 struct inode *inode; 1506 struct isofs_iget5_callback_data data; 1507 long ret; 1508 1509 if (offset >= 1ul << sb->s_blocksize_bits) 1510 return ERR_PTR(-EINVAL); 1511 1512 data.block = block; 1513 data.offset = offset; 1514 1515 hashval = (block << sb->s_blocksize_bits) | offset; 1516 1517 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1518 &isofs_iget5_set, &data); 1519 1520 if (!inode) 1521 return ERR_PTR(-ENOMEM); 1522 1523 if (inode->i_state & I_NEW) { 1524 ret = isofs_read_inode(inode); 1525 if (ret < 0) { 1526 iget_failed(inode); 1527 inode = ERR_PTR(ret); 1528 } else { 1529 unlock_new_inode(inode); 1530 } 1531 } 1532 1533 return inode; 1534 } 1535 1536 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1537 int flags, const char *dev_name, void *data) 1538 { 1539 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1540 } 1541 1542 static struct file_system_type iso9660_fs_type = { 1543 .owner = THIS_MODULE, 1544 .name = "iso9660", 1545 .mount = isofs_mount, 1546 .kill_sb = kill_block_super, 1547 .fs_flags = FS_REQUIRES_DEV, 1548 }; 1549 1550 static int __init init_iso9660_fs(void) 1551 { 1552 int err = init_inodecache(); 1553 if (err) 1554 goto out; 1555 #ifdef CONFIG_ZISOFS 1556 err = zisofs_init(); 1557 if (err) 1558 goto out1; 1559 #endif 1560 err = register_filesystem(&iso9660_fs_type); 1561 if (err) 1562 goto out2; 1563 return 0; 1564 out2: 1565 #ifdef CONFIG_ZISOFS 1566 zisofs_cleanup(); 1567 out1: 1568 #endif 1569 destroy_inodecache(); 1570 out: 1571 return err; 1572 } 1573 1574 static void __exit exit_iso9660_fs(void) 1575 { 1576 unregister_filesystem(&iso9660_fs_type); 1577 #ifdef CONFIG_ZISOFS 1578 zisofs_cleanup(); 1579 #endif 1580 destroy_inodecache(); 1581 } 1582 1583 module_init(init_iso9660_fs) 1584 module_exit(exit_iso9660_fs) 1585 MODULE_LICENSE("GPL"); 1586 /* Actual filesystem name is iso9660, as requested in filesystems.c */ 1587 MODULE_ALIAS("iso9660"); 1588