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