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