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 * Initialize the superblock and read the root inode. 548 * 549 * Note: a check_disk_change() has been done immediately prior 550 * to this call, so we don't need to check again. 551 */ 552 static int isofs_fill_super(struct super_block *s, void *data, int silent) 553 { 554 struct buffer_head *bh = NULL, *pri_bh = NULL; 555 struct hs_primary_descriptor *h_pri = NULL; 556 struct iso_primary_descriptor *pri = NULL; 557 struct iso_supplementary_descriptor *sec = NULL; 558 struct iso_directory_record *rootp; 559 struct inode *inode; 560 struct iso9660_options opt; 561 struct isofs_sb_info *sbi; 562 unsigned long first_data_zone; 563 int joliet_level = 0; 564 int iso_blknum, block; 565 int orig_zonesize; 566 int table, error = -EINVAL; 567 unsigned int vol_desc_start; 568 569 save_mount_options(s, data); 570 571 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 572 if (!sbi) 573 return -ENOMEM; 574 s->s_fs_info = sbi; 575 576 if (!parse_options((char *)data, &opt)) 577 goto out_freesbi; 578 579 /* 580 * First of all, get the hardware blocksize for this device. 581 * If we don't know what it is, or the hardware blocksize is 582 * larger than the blocksize the user specified, then use 583 * that value. 584 */ 585 /* 586 * What if bugger tells us to go beyond page size? 587 */ 588 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 589 590 sbi->s_high_sierra = 0; /* default is iso9660 */ 591 592 vol_desc_start = (opt.sbsector != -1) ? 593 opt.sbsector : isofs_get_last_session(s,opt.session); 594 595 for (iso_blknum = vol_desc_start+16; 596 iso_blknum < vol_desc_start+100; iso_blknum++) { 597 struct hs_volume_descriptor *hdp; 598 struct iso_volume_descriptor *vdp; 599 600 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 601 if (!(bh = sb_bread(s, block))) 602 goto out_no_read; 603 604 vdp = (struct iso_volume_descriptor *)bh->b_data; 605 hdp = (struct hs_volume_descriptor *)bh->b_data; 606 607 /* 608 * Due to the overlapping physical location of the descriptors, 609 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 610 * proper identification in this case, we first check for ISO. 611 */ 612 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 613 if (isonum_711(vdp->type) == ISO_VD_END) 614 break; 615 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 616 if (pri == NULL) { 617 pri = (struct iso_primary_descriptor *)vdp; 618 /* Save the buffer in case we need it ... */ 619 pri_bh = bh; 620 bh = NULL; 621 } 622 } 623 #ifdef CONFIG_JOLIET 624 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 625 sec = (struct iso_supplementary_descriptor *)vdp; 626 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 627 if (opt.joliet) { 628 if (sec->escape[2] == 0x40) 629 joliet_level = 1; 630 else if (sec->escape[2] == 0x43) 631 joliet_level = 2; 632 else if (sec->escape[2] == 0x45) 633 joliet_level = 3; 634 635 printk(KERN_DEBUG "ISO 9660 Extensions: " 636 "Microsoft Joliet Level %d\n", 637 joliet_level); 638 } 639 goto root_found; 640 } else { 641 /* Unknown supplementary volume descriptor */ 642 sec = NULL; 643 } 644 } 645 #endif 646 } else { 647 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 648 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 649 goto out_freebh; 650 651 sbi->s_high_sierra = 1; 652 opt.rock = 0; 653 h_pri = (struct hs_primary_descriptor *)vdp; 654 goto root_found; 655 } 656 } 657 658 /* Just skip any volume descriptors we don't recognize */ 659 660 brelse(bh); 661 bh = NULL; 662 } 663 /* 664 * If we fall through, either no volume descriptor was found, 665 * or else we passed a primary descriptor looking for others. 666 */ 667 if (!pri) 668 goto out_unknown_format; 669 brelse(bh); 670 bh = pri_bh; 671 pri_bh = NULL; 672 673 root_found: 674 675 if (joliet_level && (pri == NULL || !opt.rock)) { 676 /* This is the case of Joliet with the norock mount flag. 677 * A disc with both Joliet and Rock Ridge is handled later 678 */ 679 pri = (struct iso_primary_descriptor *) sec; 680 } 681 682 if(sbi->s_high_sierra){ 683 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 684 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 685 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 686 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 687 } else { 688 if (!pri) 689 goto out_freebh; 690 rootp = (struct iso_directory_record *) pri->root_directory_record; 691 sbi->s_nzones = isonum_733(pri->volume_space_size); 692 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 693 sbi->s_max_size = isonum_733(pri->volume_space_size); 694 } 695 696 sbi->s_ninodes = 0; /* No way to figure this out easily */ 697 698 orig_zonesize = sbi->s_log_zone_size; 699 /* 700 * If the zone size is smaller than the hardware sector size, 701 * this is a fatal error. This would occur if the disc drive 702 * had sectors that were 2048 bytes, but the filesystem had 703 * blocks that were 512 bytes (which should only very rarely 704 * happen.) 705 */ 706 if (orig_zonesize < opt.blocksize) 707 goto out_bad_size; 708 709 /* RDE: convert log zone size to bit shift */ 710 switch (sbi->s_log_zone_size) { 711 case 512: sbi->s_log_zone_size = 9; break; 712 case 1024: sbi->s_log_zone_size = 10; break; 713 case 2048: sbi->s_log_zone_size = 11; break; 714 715 default: 716 goto out_bad_zone_size; 717 } 718 719 s->s_magic = ISOFS_SUPER_MAGIC; 720 721 /* 722 * With multi-extent files, file size is only limited by the maximum 723 * size of a file system, which is 8 TB. 724 */ 725 s->s_maxbytes = 0x80000000000LL; 726 727 /* 728 * The CDROM is read-only, has no nodes (devices) on it, and since 729 * all of the files appear to be owned by root, we really do not want 730 * to allow suid. (suid or devices will not show up unless we have 731 * Rock Ridge extensions) 732 */ 733 734 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */; 735 736 /* Set this for reference. Its not currently used except on write 737 which we don't have .. */ 738 739 first_data_zone = isonum_733(rootp->extent) + 740 isonum_711(rootp->ext_attr_length); 741 sbi->s_firstdatazone = first_data_zone; 742 #ifndef BEQUIET 743 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 744 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 745 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 746 if(sbi->s_high_sierra) 747 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 748 #endif 749 750 /* 751 * If the Joliet level is set, we _may_ decide to use the 752 * secondary descriptor, but can't be sure until after we 753 * read the root inode. But before reading the root inode 754 * we may need to change the device blocksize, and would 755 * rather release the old buffer first. So, we cache the 756 * first_data_zone value from the secondary descriptor. 757 */ 758 if (joliet_level) { 759 pri = (struct iso_primary_descriptor *) sec; 760 rootp = (struct iso_directory_record *) 761 pri->root_directory_record; 762 first_data_zone = isonum_733(rootp->extent) + 763 isonum_711(rootp->ext_attr_length); 764 } 765 766 /* 767 * We're all done using the volume descriptor, and may need 768 * to change the device blocksize, so release the buffer now. 769 */ 770 brelse(pri_bh); 771 brelse(bh); 772 773 /* 774 * Force the blocksize to 512 for 512 byte sectors. The file 775 * read primitives really get it wrong in a bad way if we don't 776 * do this. 777 * 778 * Note - we should never be setting the blocksize to something 779 * less than the hardware sector size for the device. If we 780 * do, we would end up having to read larger buffers and split 781 * out portions to satisfy requests. 782 * 783 * Note2- the idea here is that we want to deal with the optimal 784 * zonesize in the filesystem. If we have it set to something less, 785 * then we have horrible problems with trying to piece together 786 * bits of adjacent blocks in order to properly read directory 787 * entries. By forcing the blocksize in this way, we ensure 788 * that we will never be required to do this. 789 */ 790 sb_set_blocksize(s, orig_zonesize); 791 792 sbi->s_nls_iocharset = NULL; 793 794 #ifdef CONFIG_JOLIET 795 if (joliet_level && opt.utf8 == 0) { 796 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 797 sbi->s_nls_iocharset = load_nls(p); 798 if (! sbi->s_nls_iocharset) { 799 /* Fail only if explicit charset specified */ 800 if (opt.iocharset) 801 goto out_freesbi; 802 sbi->s_nls_iocharset = load_nls_default(); 803 } 804 } 805 #endif 806 s->s_op = &isofs_sops; 807 s->s_export_op = &isofs_export_ops; 808 sbi->s_mapping = opt.map; 809 sbi->s_rock = (opt.rock ? 2 : 0); 810 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 811 sbi->s_cruft = opt.cruft; 812 sbi->s_hide = opt.hide; 813 sbi->s_showassoc = opt.showassoc; 814 sbi->s_uid = opt.uid; 815 sbi->s_gid = opt.gid; 816 sbi->s_uid_set = opt.uid_set; 817 sbi->s_gid_set = opt.gid_set; 818 sbi->s_utf8 = opt.utf8; 819 sbi->s_nocompress = opt.nocompress; 820 sbi->s_overriderockperm = opt.overriderockperm; 821 mutex_init(&sbi->s_mutex); 822 /* 823 * It would be incredibly stupid to allow people to mark every file 824 * on the disk as suid, so we merely allow them to set the default 825 * permissions. 826 */ 827 if (opt.fmode != ISOFS_INVALID_MODE) 828 sbi->s_fmode = opt.fmode & 0777; 829 else 830 sbi->s_fmode = ISOFS_INVALID_MODE; 831 if (opt.dmode != ISOFS_INVALID_MODE) 832 sbi->s_dmode = opt.dmode & 0777; 833 else 834 sbi->s_dmode = ISOFS_INVALID_MODE; 835 836 /* 837 * Read the root inode, which _may_ result in changing 838 * the s_rock flag. Once we have the final s_rock value, 839 * we then decide whether to use the Joliet descriptor. 840 */ 841 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 842 if (IS_ERR(inode)) 843 goto out_no_root; 844 845 /* 846 * If this disk has both Rock Ridge and Joliet on it, then we 847 * want to use Rock Ridge by default. This can be overridden 848 * by using the norock mount option. There is still one other 849 * possibility that is not taken into account: a Rock Ridge 850 * CD with Unicode names. Until someone sees such a beast, it 851 * will not be supported. 852 */ 853 if (sbi->s_rock == 1) { 854 joliet_level = 0; 855 } else if (joliet_level) { 856 sbi->s_rock = 0; 857 if (sbi->s_firstdatazone != first_data_zone) { 858 sbi->s_firstdatazone = first_data_zone; 859 printk(KERN_DEBUG 860 "ISOFS: changing to secondary root\n"); 861 iput(inode); 862 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 863 if (IS_ERR(inode)) 864 goto out_no_root; 865 } 866 } 867 868 if (opt.check == 'u') { 869 /* Only Joliet is case insensitive by default */ 870 if (joliet_level) 871 opt.check = 'r'; 872 else 873 opt.check = 's'; 874 } 875 sbi->s_joliet_level = joliet_level; 876 877 /* Make sure the root inode is a directory */ 878 if (!S_ISDIR(inode->i_mode)) { 879 printk(KERN_WARNING 880 "isofs_fill_super: root inode is not a directory. " 881 "Corrupted media?\n"); 882 goto out_iput; 883 } 884 885 /* get the root dentry */ 886 s->s_root = d_alloc_root(inode); 887 if (!(s->s_root)) 888 goto out_no_root; 889 890 table = 0; 891 if (joliet_level) 892 table += 2; 893 if (opt.check == 'r') 894 table++; 895 s->s_root->d_op = &isofs_dentry_ops[table]; 896 897 kfree(opt.iocharset); 898 899 return 0; 900 901 /* 902 * Display error messages and free resources. 903 */ 904 out_iput: 905 iput(inode); 906 goto out_no_inode; 907 out_no_root: 908 error = PTR_ERR(inode); 909 if (error != -ENOMEM) 910 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 911 out_no_inode: 912 #ifdef CONFIG_JOLIET 913 unload_nls(sbi->s_nls_iocharset); 914 #endif 915 goto out_freesbi; 916 out_no_read: 917 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 918 __func__, s->s_id, iso_blknum, block); 919 goto out_freesbi; 920 out_bad_zone_size: 921 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 922 sbi->s_log_zone_size); 923 goto out_freebh; 924 out_bad_size: 925 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 926 orig_zonesize, opt.blocksize); 927 goto out_freebh; 928 out_unknown_format: 929 if (!silent) 930 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 931 932 out_freebh: 933 brelse(bh); 934 out_freesbi: 935 kfree(opt.iocharset); 936 kfree(sbi); 937 s->s_fs_info = NULL; 938 return error; 939 } 940 941 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 942 { 943 struct super_block *sb = dentry->d_sb; 944 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 945 946 buf->f_type = ISOFS_SUPER_MAGIC; 947 buf->f_bsize = sb->s_blocksize; 948 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 949 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 950 buf->f_bfree = 0; 951 buf->f_bavail = 0; 952 buf->f_files = ISOFS_SB(sb)->s_ninodes; 953 buf->f_ffree = 0; 954 buf->f_fsid.val[0] = (u32)id; 955 buf->f_fsid.val[1] = (u32)(id >> 32); 956 buf->f_namelen = NAME_MAX; 957 return 0; 958 } 959 960 /* 961 * Get a set of blocks; filling in buffer_heads if already allocated 962 * or getblk() if they are not. Returns the number of blocks inserted 963 * (-ve == error.) 964 */ 965 int isofs_get_blocks(struct inode *inode, sector_t iblock_s, 966 struct buffer_head **bh, unsigned long nblocks) 967 { 968 unsigned long b_off; 969 unsigned offset, sect_size; 970 unsigned int firstext; 971 unsigned long nextblk, nextoff; 972 long iblock = (long)iblock_s; 973 int section, rv, error; 974 struct iso_inode_info *ei = ISOFS_I(inode); 975 976 error = -EIO; 977 rv = 0; 978 if (iblock < 0 || iblock != iblock_s) { 979 printk(KERN_DEBUG "%s: block number too large\n", __func__); 980 goto abort; 981 } 982 983 b_off = iblock; 984 985 offset = 0; 986 firstext = ei->i_first_extent; 987 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 988 nextblk = ei->i_next_section_block; 989 nextoff = ei->i_next_section_offset; 990 section = 0; 991 992 while (nblocks) { 993 /* If we are *way* beyond the end of the file, print a message. 994 * Access beyond the end of the file up to the next page boundary 995 * is normal, however because of the way the page cache works. 996 * In this case, we just return 0 so that we can properly fill 997 * the page with useless information without generating any 998 * I/O errors. 999 */ 1000 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1001 printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n", 1002 __func__, iblock, (unsigned long) inode->i_size); 1003 goto abort; 1004 } 1005 1006 /* On the last section, nextblk == 0, section size is likely to 1007 * exceed sect_size by a partial block, and access beyond the 1008 * end of the file will reach beyond the section size, too. 1009 */ 1010 while (nextblk && (b_off >= (offset + sect_size))) { 1011 struct inode *ninode; 1012 1013 offset += sect_size; 1014 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1015 if (IS_ERR(ninode)) { 1016 error = PTR_ERR(ninode); 1017 goto abort; 1018 } 1019 firstext = ISOFS_I(ninode)->i_first_extent; 1020 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1021 nextblk = ISOFS_I(ninode)->i_next_section_block; 1022 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1023 iput(ninode); 1024 1025 if (++section > 100) { 1026 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1027 " aborting...\n", __func__); 1028 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u " 1029 "nextblk=%lu nextoff=%lu\n", __func__, 1030 iblock, firstext, (unsigned) sect_size, 1031 nextblk, nextoff); 1032 goto abort; 1033 } 1034 } 1035 1036 if (*bh) { 1037 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1038 } else { 1039 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1040 if (!*bh) 1041 goto abort; 1042 } 1043 bh++; /* Next buffer head */ 1044 b_off++; /* Next buffer offset */ 1045 nblocks--; 1046 rv++; 1047 } 1048 1049 error = 0; 1050 abort: 1051 return rv != 0 ? rv : error; 1052 } 1053 1054 /* 1055 * Used by the standard interfaces. 1056 */ 1057 static int isofs_get_block(struct inode *inode, sector_t iblock, 1058 struct buffer_head *bh_result, int create) 1059 { 1060 int ret; 1061 1062 if (create) { 1063 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1064 return -EROFS; 1065 } 1066 1067 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1068 return ret < 0 ? ret : 0; 1069 } 1070 1071 static int isofs_bmap(struct inode *inode, sector_t block) 1072 { 1073 struct buffer_head dummy; 1074 int error; 1075 1076 dummy.b_state = 0; 1077 dummy.b_blocknr = -1000; 1078 error = isofs_get_block(inode, block, &dummy, 0); 1079 if (!error) 1080 return dummy.b_blocknr; 1081 return 0; 1082 } 1083 1084 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1085 { 1086 sector_t blknr = isofs_bmap(inode, block); 1087 if (!blknr) 1088 return NULL; 1089 return sb_bread(inode->i_sb, blknr); 1090 } 1091 1092 static int isofs_readpage(struct file *file, struct page *page) 1093 { 1094 return block_read_full_page(page,isofs_get_block); 1095 } 1096 1097 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1098 { 1099 return generic_block_bmap(mapping,block,isofs_get_block); 1100 } 1101 1102 static const struct address_space_operations isofs_aops = { 1103 .readpage = isofs_readpage, 1104 .sync_page = block_sync_page, 1105 .bmap = _isofs_bmap 1106 }; 1107 1108 static int isofs_read_level3_size(struct inode *inode) 1109 { 1110 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1111 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1112 struct buffer_head *bh = NULL; 1113 unsigned long block, offset, block_saved, offset_saved; 1114 int i = 0; 1115 int more_entries = 0; 1116 struct iso_directory_record *tmpde = NULL; 1117 struct iso_inode_info *ei = ISOFS_I(inode); 1118 1119 inode->i_size = 0; 1120 1121 /* The first 16 blocks are reserved as the System Area. Thus, 1122 * no inodes can appear in block 0. We use this to flag that 1123 * this is the last section. */ 1124 ei->i_next_section_block = 0; 1125 ei->i_next_section_offset = 0; 1126 1127 block = ei->i_iget5_block; 1128 offset = ei->i_iget5_offset; 1129 1130 do { 1131 struct iso_directory_record *de; 1132 unsigned int de_len; 1133 1134 if (!bh) { 1135 bh = sb_bread(inode->i_sb, block); 1136 if (!bh) 1137 goto out_noread; 1138 } 1139 de = (struct iso_directory_record *) (bh->b_data + offset); 1140 de_len = *(unsigned char *) de; 1141 1142 if (de_len == 0) { 1143 brelse(bh); 1144 bh = NULL; 1145 ++block; 1146 offset = 0; 1147 continue; 1148 } 1149 1150 block_saved = block; 1151 offset_saved = offset; 1152 offset += de_len; 1153 1154 /* Make sure we have a full directory entry */ 1155 if (offset >= bufsize) { 1156 int slop = bufsize - offset + de_len; 1157 if (!tmpde) { 1158 tmpde = kmalloc(256, GFP_KERNEL); 1159 if (!tmpde) 1160 goto out_nomem; 1161 } 1162 memcpy(tmpde, de, slop); 1163 offset &= bufsize - 1; 1164 block++; 1165 brelse(bh); 1166 bh = NULL; 1167 if (offset) { 1168 bh = sb_bread(inode->i_sb, block); 1169 if (!bh) 1170 goto out_noread; 1171 memcpy((void *)tmpde+slop, bh->b_data, offset); 1172 } 1173 de = tmpde; 1174 } 1175 1176 inode->i_size += isonum_733(de->size); 1177 if (i == 1) { 1178 ei->i_next_section_block = block_saved; 1179 ei->i_next_section_offset = offset_saved; 1180 } 1181 1182 more_entries = de->flags[-high_sierra] & 0x80; 1183 1184 i++; 1185 if (i > 100) 1186 goto out_toomany; 1187 } while (more_entries); 1188 out: 1189 kfree(tmpde); 1190 if (bh) 1191 brelse(bh); 1192 return 0; 1193 1194 out_nomem: 1195 if (bh) 1196 brelse(bh); 1197 return -ENOMEM; 1198 1199 out_noread: 1200 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1201 kfree(tmpde); 1202 return -EIO; 1203 1204 out_toomany: 1205 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1206 "isofs_read_level3_size: inode=%lu\n", 1207 __func__, inode->i_ino); 1208 goto out; 1209 } 1210 1211 static int isofs_read_inode(struct inode *inode) 1212 { 1213 struct super_block *sb = inode->i_sb; 1214 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1215 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1216 unsigned long block; 1217 int high_sierra = sbi->s_high_sierra; 1218 struct buffer_head *bh = NULL; 1219 struct iso_directory_record *de; 1220 struct iso_directory_record *tmpde = NULL; 1221 unsigned int de_len; 1222 unsigned long offset; 1223 struct iso_inode_info *ei = ISOFS_I(inode); 1224 int ret = -EIO; 1225 1226 block = ei->i_iget5_block; 1227 bh = sb_bread(inode->i_sb, block); 1228 if (!bh) 1229 goto out_badread; 1230 1231 offset = ei->i_iget5_offset; 1232 1233 de = (struct iso_directory_record *) (bh->b_data + offset); 1234 de_len = *(unsigned char *) de; 1235 1236 if (offset + de_len > bufsize) { 1237 int frag1 = bufsize - offset; 1238 1239 tmpde = kmalloc(de_len, GFP_KERNEL); 1240 if (tmpde == NULL) { 1241 printk(KERN_INFO "%s: out of memory\n", __func__); 1242 ret = -ENOMEM; 1243 goto fail; 1244 } 1245 memcpy(tmpde, bh->b_data + offset, frag1); 1246 brelse(bh); 1247 bh = sb_bread(inode->i_sb, ++block); 1248 if (!bh) 1249 goto out_badread; 1250 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1251 de = tmpde; 1252 } 1253 1254 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1255 ei->i_iget5_offset, 1256 ISOFS_BUFFER_BITS(inode)); 1257 1258 /* Assume it is a normal-format file unless told otherwise */ 1259 ei->i_file_format = isofs_file_normal; 1260 1261 if (de->flags[-high_sierra] & 2) { 1262 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1263 inode->i_mode = S_IFDIR | sbi->s_dmode; 1264 else 1265 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1266 inode->i_nlink = 1; /* 1267 * Set to 1. We know there are 2, but 1268 * the find utility tries to optimize 1269 * if it is 2, and it screws up. It is 1270 * easier to give 1 which tells find to 1271 * do it the hard way. 1272 */ 1273 } else { 1274 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1275 inode->i_mode = S_IFREG | sbi->s_fmode; 1276 } else { 1277 /* 1278 * Set default permissions: r-x for all. The disc 1279 * could be shared with DOS machines so virtually 1280 * anything could be a valid executable. 1281 */ 1282 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1283 } 1284 inode->i_nlink = 1; 1285 } 1286 inode->i_uid = sbi->s_uid; 1287 inode->i_gid = sbi->s_gid; 1288 inode->i_blocks = 0; 1289 1290 ei->i_format_parm[0] = 0; 1291 ei->i_format_parm[1] = 0; 1292 ei->i_format_parm[2] = 0; 1293 1294 ei->i_section_size = isonum_733(de->size); 1295 if (de->flags[-high_sierra] & 0x80) { 1296 ret = isofs_read_level3_size(inode); 1297 if (ret < 0) 1298 goto fail; 1299 ret = -EIO; 1300 } else { 1301 ei->i_next_section_block = 0; 1302 ei->i_next_section_offset = 0; 1303 inode->i_size = isonum_733(de->size); 1304 } 1305 1306 /* 1307 * Some dipshit decided to store some other bit of information 1308 * in the high byte of the file length. Truncate size in case 1309 * this CDROM was mounted with the cruft option. 1310 */ 1311 1312 if (sbi->s_cruft) 1313 inode->i_size &= 0x00ffffff; 1314 1315 if (de->interleave[0]) { 1316 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1317 inode->i_size = 0; 1318 } 1319 1320 /* I have no idea what file_unit_size is used for, so 1321 we will flag it for now */ 1322 if (de->file_unit_size[0] != 0) { 1323 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1324 inode->i_ino); 1325 } 1326 1327 /* I have no idea what other flag bits are used for, so 1328 we will flag it for now */ 1329 #ifdef DEBUG 1330 if((de->flags[-high_sierra] & ~2)!= 0){ 1331 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1332 "(%ld %x).\n", 1333 inode->i_ino, de->flags[-high_sierra]); 1334 } 1335 #endif 1336 1337 inode->i_mtime.tv_sec = 1338 inode->i_atime.tv_sec = 1339 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1340 inode->i_mtime.tv_nsec = 1341 inode->i_atime.tv_nsec = 1342 inode->i_ctime.tv_nsec = 0; 1343 1344 ei->i_first_extent = (isonum_733(de->extent) + 1345 isonum_711(de->ext_attr_length)); 1346 1347 /* Set the number of blocks for stat() - should be done before RR */ 1348 inode->i_blocks = (inode->i_size + 511) >> 9; 1349 1350 /* 1351 * Now test for possible Rock Ridge extensions which will override 1352 * some of these numbers in the inode structure. 1353 */ 1354 1355 if (!high_sierra) { 1356 parse_rock_ridge_inode(de, inode); 1357 /* if we want uid/gid set, override the rock ridge setting */ 1358 if (sbi->s_uid_set) 1359 inode->i_uid = sbi->s_uid; 1360 if (sbi->s_gid_set) 1361 inode->i_gid = sbi->s_gid; 1362 } 1363 /* Now set final access rights if overriding rock ridge setting */ 1364 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1365 sbi->s_dmode != ISOFS_INVALID_MODE) 1366 inode->i_mode = S_IFDIR | sbi->s_dmode; 1367 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1368 sbi->s_fmode != ISOFS_INVALID_MODE) 1369 inode->i_mode = S_IFREG | sbi->s_fmode; 1370 1371 /* Install the inode operations vector */ 1372 if (S_ISREG(inode->i_mode)) { 1373 inode->i_fop = &generic_ro_fops; 1374 switch (ei->i_file_format) { 1375 #ifdef CONFIG_ZISOFS 1376 case isofs_file_compressed: 1377 inode->i_data.a_ops = &zisofs_aops; 1378 break; 1379 #endif 1380 default: 1381 inode->i_data.a_ops = &isofs_aops; 1382 break; 1383 } 1384 } else if (S_ISDIR(inode->i_mode)) { 1385 inode->i_op = &isofs_dir_inode_operations; 1386 inode->i_fop = &isofs_dir_operations; 1387 } else if (S_ISLNK(inode->i_mode)) { 1388 inode->i_op = &page_symlink_inode_operations; 1389 inode->i_data.a_ops = &isofs_symlink_aops; 1390 } else 1391 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1392 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1393 1394 ret = 0; 1395 out: 1396 kfree(tmpde); 1397 if (bh) 1398 brelse(bh); 1399 return ret; 1400 1401 out_badread: 1402 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1403 fail: 1404 goto out; 1405 } 1406 1407 struct isofs_iget5_callback_data { 1408 unsigned long block; 1409 unsigned long offset; 1410 }; 1411 1412 static int isofs_iget5_test(struct inode *ino, void *data) 1413 { 1414 struct iso_inode_info *i = ISOFS_I(ino); 1415 struct isofs_iget5_callback_data *d = 1416 (struct isofs_iget5_callback_data*)data; 1417 return (i->i_iget5_block == d->block) 1418 && (i->i_iget5_offset == d->offset); 1419 } 1420 1421 static int isofs_iget5_set(struct inode *ino, void *data) 1422 { 1423 struct iso_inode_info *i = ISOFS_I(ino); 1424 struct isofs_iget5_callback_data *d = 1425 (struct isofs_iget5_callback_data*)data; 1426 i->i_iget5_block = d->block; 1427 i->i_iget5_offset = d->offset; 1428 return 0; 1429 } 1430 1431 /* Store, in the inode's containing structure, the block and block 1432 * offset that point to the underlying meta-data for the inode. The 1433 * code below is otherwise similar to the iget() code in 1434 * include/linux/fs.h */ 1435 struct inode *isofs_iget(struct super_block *sb, 1436 unsigned long block, 1437 unsigned long offset) 1438 { 1439 unsigned long hashval; 1440 struct inode *inode; 1441 struct isofs_iget5_callback_data data; 1442 long ret; 1443 1444 if (offset >= 1ul << sb->s_blocksize_bits) 1445 return ERR_PTR(-EINVAL); 1446 1447 data.block = block; 1448 data.offset = offset; 1449 1450 hashval = (block << sb->s_blocksize_bits) | offset; 1451 1452 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1453 &isofs_iget5_set, &data); 1454 1455 if (!inode) 1456 return ERR_PTR(-ENOMEM); 1457 1458 if (inode->i_state & I_NEW) { 1459 ret = isofs_read_inode(inode); 1460 if (ret < 0) { 1461 iget_failed(inode); 1462 inode = ERR_PTR(ret); 1463 } else { 1464 unlock_new_inode(inode); 1465 } 1466 } 1467 1468 return inode; 1469 } 1470 1471 static int isofs_get_sb(struct file_system_type *fs_type, 1472 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 1473 { 1474 return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super, 1475 mnt); 1476 } 1477 1478 static struct file_system_type iso9660_fs_type = { 1479 .owner = THIS_MODULE, 1480 .name = "iso9660", 1481 .get_sb = isofs_get_sb, 1482 .kill_sb = kill_block_super, 1483 .fs_flags = FS_REQUIRES_DEV, 1484 }; 1485 1486 static int __init init_iso9660_fs(void) 1487 { 1488 int err = init_inodecache(); 1489 if (err) 1490 goto out; 1491 #ifdef CONFIG_ZISOFS 1492 err = zisofs_init(); 1493 if (err) 1494 goto out1; 1495 #endif 1496 err = register_filesystem(&iso9660_fs_type); 1497 if (err) 1498 goto out2; 1499 return 0; 1500 out2: 1501 #ifdef CONFIG_ZISOFS 1502 zisofs_cleanup(); 1503 out1: 1504 #endif 1505 destroy_inodecache(); 1506 out: 1507 return err; 1508 } 1509 1510 static void __exit exit_iso9660_fs(void) 1511 { 1512 unregister_filesystem(&iso9660_fs_type); 1513 #ifdef CONFIG_ZISOFS 1514 zisofs_cleanup(); 1515 #endif 1516 destroy_inodecache(); 1517 } 1518 1519 module_init(init_iso9660_fs) 1520 module_exit(exit_iso9660_fs) 1521 MODULE_LICENSE("GPL"); 1522 /* Actual filesystem name is iso9660, as requested in filesystems.c */ 1523 MODULE_ALIAS("iso9660"); 1524