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