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 M��nkeberg - 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 30static int isofs_hashi(struct dentry *parent, struct qstr *qstr); 31static int isofs_hash(struct dentry *parent, struct qstr *qstr); 32static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b); 33static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b); 34 35#ifdef CONFIG_JOLIET 36static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr); 37static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr); 38static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b); 39static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b); 40#endif 41 42static 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 unload_nls(sbi->s_nls_iocharset); 50 51 unlock_kernel(); 52#endif 53 54 kfree(sbi); 55 sb->s_fs_info = NULL; 56 return; 57} 58 59static int isofs_read_inode(struct inode *); 60static int isofs_statfs (struct dentry *, struct kstatfs *); 61 62static struct kmem_cache *isofs_inode_cachep; 63 64static struct inode *isofs_alloc_inode(struct super_block *sb) 65{ 66 struct iso_inode_info *ei; 67 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); 68 if (!ei) 69 return NULL; 70 return &ei->vfs_inode; 71} 72 73static void isofs_destroy_inode(struct inode *inode) 74{ 75 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 76} 77 78static void init_once(void *foo) 79{ 80 struct iso_inode_info *ei = foo; 81 82 inode_init_once(&ei->vfs_inode); 83} 84 85static int init_inodecache(void) 86{ 87 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", 88 sizeof(struct iso_inode_info), 89 0, (SLAB_RECLAIM_ACCOUNT| 90 SLAB_MEM_SPREAD), 91 init_once); 92 if (isofs_inode_cachep == NULL) 93 return -ENOMEM; 94 return 0; 95} 96 97static void destroy_inodecache(void) 98{ 99 kmem_cache_destroy(isofs_inode_cachep); 100} 101 102static int isofs_remount(struct super_block *sb, int *flags, char *data) 103{ 104 /* we probably want a lot more here */ 105 *flags |= MS_RDONLY; 106 return 0; 107} 108 109static const struct super_operations isofs_sops = { 110 .alloc_inode = isofs_alloc_inode, 111 .destroy_inode = isofs_destroy_inode, 112 .put_super = isofs_put_super, 113 .statfs = isofs_statfs, 114 .remount_fs = isofs_remount, 115 .show_options = generic_show_options, 116}; 117 118 119static const struct dentry_operations isofs_dentry_ops[] = { 120 { 121 .d_hash = isofs_hash, 122 .d_compare = isofs_dentry_cmp, 123 }, 124 { 125 .d_hash = isofs_hashi, 126 .d_compare = isofs_dentry_cmpi, 127 }, 128#ifdef CONFIG_JOLIET 129 { 130 .d_hash = isofs_hash_ms, 131 .d_compare = isofs_dentry_cmp_ms, 132 }, 133 { 134 .d_hash = isofs_hashi_ms, 135 .d_compare = isofs_dentry_cmpi_ms, 136 }, 137#endif 138}; 139 140struct iso9660_options{ 141 unsigned int rock:1; 142 unsigned int joliet:1; 143 unsigned int cruft:1; 144 unsigned int hide:1; 145 unsigned int showassoc:1; 146 unsigned int nocompress:1; 147 unsigned int overriderockperm:1; 148 unsigned int uid_set:1; 149 unsigned int gid_set:1; 150 unsigned int utf8:1; 151 unsigned char map; 152 unsigned char check; 153 unsigned int blocksize; 154 mode_t fmode; 155 mode_t dmode; 156 gid_t gid; 157 uid_t uid; 158 char *iocharset; 159 /* LVE */ 160 s32 session; 161 s32 sbsector; 162}; 163 164/* 165 * Compute the hash for the isofs name corresponding to the dentry. 166 */ 167static int 168isofs_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 */ 188static int 189isofs_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 */ 216static 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 */ 240static 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 261static int 262isofs_hash(struct dentry *dentry, struct qstr *qstr) 263{ 264 return isofs_hash_common(dentry, qstr, 0); 265} 266 267static int 268isofs_hashi(struct dentry *dentry, struct qstr *qstr) 269{ 270 return isofs_hashi_common(dentry, qstr, 0); 271} 272 273static int 274isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b) 275{ 276 return isofs_dentry_cmp_common(dentry, a, b, 0); 277} 278 279static int 280isofs_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 286static int 287isofs_hash_ms(struct dentry *dentry, struct qstr *qstr) 288{ 289 return isofs_hash_common(dentry, qstr, 1); 290} 291 292static int 293isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr) 294{ 295 return isofs_hashi_common(dentry, qstr, 1); 296} 297 298static int 299isofs_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 304static int 305isofs_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 311enum { 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, Opt_overriderockperm, 316}; 317 318static 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_overriderockperm, "overriderockperm"}, 344 {Opt_block, "block=%u"}, 345 {Opt_ignore, "conv=binary"}, 346 {Opt_ignore, "conv=b"}, 347 {Opt_ignore, "conv=text"}, 348 {Opt_ignore, "conv=t"}, 349 {Opt_ignore, "conv=mtext"}, 350 {Opt_ignore, "conv=m"}, 351 {Opt_ignore, "conv=auto"}, 352 {Opt_ignore, "conv=a"}, 353 {Opt_nocompress, "nocompress"}, 354 {Opt_err, NULL} 355}; 356 357static int parse_options(char *options, struct iso9660_options *popt) 358{ 359 char *p; 360 int option; 361 362 popt->map = 'n'; 363 popt->rock = 1; 364 popt->joliet = 1; 365 popt->cruft = 0; 366 popt->hide = 0; 367 popt->showassoc = 0; 368 popt->check = 'u'; /* unset */ 369 popt->nocompress = 0; 370 popt->blocksize = 1024; 371 popt->fmode = popt->dmode = ISOFS_INVALID_MODE; 372 popt->uid_set = 0; 373 popt->gid_set = 0; 374 popt->gid = 0; 375 popt->uid = 0; 376 popt->iocharset = NULL; 377 popt->utf8 = 0; 378 popt->overriderockperm = 0; 379 popt->session=-1; 380 popt->sbsector=-1; 381 if (!options) 382 return 1; 383 384 while ((p = strsep(&options, ",")) != NULL) { 385 int token; 386 substring_t args[MAX_OPT_ARGS]; 387 unsigned n; 388 389 if (!*p) 390 continue; 391 392 token = match_token(p, tokens, args); 393 switch (token) { 394 case Opt_norock: 395 popt->rock = 0; 396 break; 397 case Opt_nojoliet: 398 popt->joliet = 0; 399 break; 400 case Opt_hide: 401 popt->hide = 1; 402 break; 403 case Opt_unhide: 404 case Opt_showassoc: 405 popt->showassoc = 1; 406 break; 407 case Opt_cruft: 408 popt->cruft = 1; 409 break; 410 case Opt_utf8: 411 popt->utf8 = 1; 412 break; 413#ifdef CONFIG_JOLIET 414 case Opt_iocharset: 415 popt->iocharset = match_strdup(&args[0]); 416 break; 417#endif 418 case Opt_map_a: 419 popt->map = 'a'; 420 break; 421 case Opt_map_o: 422 popt->map = 'o'; 423 break; 424 case Opt_map_n: 425 popt->map = 'n'; 426 break; 427 case Opt_session: 428 if (match_int(&args[0], &option)) 429 return 0; 430 n = option; 431 if (n > 99) 432 return 0; 433 popt->session = n + 1; 434 break; 435 case Opt_sb: 436 if (match_int(&args[0], &option)) 437 return 0; 438 popt->sbsector = option; 439 break; 440 case Opt_check_r: 441 popt->check = 'r'; 442 break; 443 case Opt_check_s: 444 popt->check = 's'; 445 break; 446 case Opt_ignore: 447 break; 448 case Opt_uid: 449 if (match_int(&args[0], &option)) 450 return 0; 451 popt->uid = option; 452 popt->uid_set = 1; 453 break; 454 case Opt_gid: 455 if (match_int(&args[0], &option)) 456 return 0; 457 popt->gid = option; 458 popt->gid_set = 1; 459 break; 460 case Opt_mode: 461 if (match_int(&args[0], &option)) 462 return 0; 463 popt->fmode = option; 464 break; 465 case Opt_dmode: 466 if (match_int(&args[0], &option)) 467 return 0; 468 popt->dmode = option; 469 break; 470 case Opt_overriderockperm: 471 popt->overriderockperm = 1; 472 break; 473 case Opt_block: 474 if (match_int(&args[0], &option)) 475 return 0; 476 n = option; 477 if (n != 512 && n != 1024 && n != 2048) 478 return 0; 479 popt->blocksize = n; 480 break; 481 case Opt_nocompress: 482 popt->nocompress = 1; 483 break; 484 default: 485 return 0; 486 } 487 } 488 return 1; 489} 490 491/* 492 * look if the driver can tell the multi session redirection value 493 * 494 * don't change this if you don't know what you do, please! 495 * Multisession is legal only with XA disks. 496 * A non-XA disk with more than one volume descriptor may do it right, but 497 * usually is written in a nowhere standardized "multi-partition" manner. 498 * Multisession uses absolute addressing (solely the first frame of the whole 499 * track is #0), multi-partition uses relative addressing (each first frame of 500 * each track is #0), and a track is not a session. 501 * 502 * A broken CDwriter software or drive firmware does not set new standards, 503 * at least not if conflicting with the existing ones. 504 * 505 * emoenke@gwdg.de 506 */ 507#define WE_OBEY_THE_WRITTEN_STANDARDS 1 508 509static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 510{ 511 struct cdrom_multisession ms_info; 512 unsigned int vol_desc_start; 513 struct block_device *bdev = sb->s_bdev; 514 int i; 515 516 vol_desc_start=0; 517 ms_info.addr_format=CDROM_LBA; 518 if(session >= 0 && session <= 99) { 519 struct cdrom_tocentry Te; 520 Te.cdte_track=session; 521 Te.cdte_format=CDROM_LBA; 522 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); 523 if (!i) { 524 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 525 session, Te.cdte_addr.lba, 526 Te.cdte_ctrl&CDROM_DATA_TRACK); 527 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) 528 return Te.cdte_addr.lba; 529 } 530 531 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 532 } 533 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); 534 if (session > 0) 535 printk(KERN_ERR "ISOFS: Invalid session number\n"); 536 if (i==0) 537#if WE_OBEY_THE_WRITTEN_STANDARDS 538 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ 539#endif 540 vol_desc_start=ms_info.addr.lba; 541 return vol_desc_start; 542} 543 544/* 545 * Initialize the superblock and read the root inode. 546 * 547 * Note: a check_disk_change() has been done immediately prior 548 * to this call, so we don't need to check again. 549 */ 550static int isofs_fill_super(struct super_block *s, void *data, int silent) 551{ 552 struct buffer_head *bh = NULL, *pri_bh = NULL; 553 struct hs_primary_descriptor *h_pri = NULL; 554 struct iso_primary_descriptor *pri = NULL; 555 struct iso_supplementary_descriptor *sec = NULL; 556 struct iso_directory_record *rootp; 557 struct inode *inode; 558 struct iso9660_options opt; 559 struct isofs_sb_info *sbi; 560 unsigned long first_data_zone; 561 int joliet_level = 0; 562 int iso_blknum, block; 563 int orig_zonesize; 564 int table, error = -EINVAL; 565 unsigned int vol_desc_start; 566 567 save_mount_options(s, data); 568 569 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 570 if (!sbi) 571 return -ENOMEM; 572 s->s_fs_info = sbi; 573 574 if (!parse_options((char *)data, &opt)) 575 goto out_freesbi; 576 577 /* 578 * First of all, get the hardware blocksize for this device. 579 * If we don't know what it is, or the hardware blocksize is 580 * larger than the blocksize the user specified, then use 581 * that value. 582 */ 583 /* 584 * What if bugger tells us to go beyond page size? 585 */ 586 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 587 588 sbi->s_high_sierra = 0; /* default is iso9660 */ 589 590 vol_desc_start = (opt.sbsector != -1) ? 591 opt.sbsector : isofs_get_last_session(s,opt.session); 592 593 for (iso_blknum = vol_desc_start+16; 594 iso_blknum < vol_desc_start+100; iso_blknum++) { 595 struct hs_volume_descriptor *hdp; 596 struct iso_volume_descriptor *vdp; 597 598 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 599 if (!(bh = sb_bread(s, block))) 600 goto out_no_read; 601 602 vdp = (struct iso_volume_descriptor *)bh->b_data; 603 hdp = (struct hs_volume_descriptor *)bh->b_data; 604 605 /* 606 * Due to the overlapping physical location of the descriptors, 607 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 608 * proper identification in this case, we first check for ISO. 609 */ 610 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 611 if (isonum_711(vdp->type) == ISO_VD_END) 612 break; 613 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 614 if (pri == NULL) { 615 pri = (struct iso_primary_descriptor *)vdp; 616 /* Save the buffer in case we need it ... */ 617 pri_bh = bh; 618 bh = NULL; 619 } 620 } 621#ifdef CONFIG_JOLIET 622 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 623 sec = (struct iso_supplementary_descriptor *)vdp; 624 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 625 if (opt.joliet) { 626 if (sec->escape[2] == 0x40) 627 joliet_level = 1; 628 else if (sec->escape[2] == 0x43) 629 joliet_level = 2; 630 else if (sec->escape[2] == 0x45) 631 joliet_level = 3; 632 633 printk(KERN_DEBUG "ISO 9660 Extensions: " 634 "Microsoft Joliet Level %d\n", 635 joliet_level); 636 } 637 goto root_found; 638 } else { 639 /* Unknown supplementary volume descriptor */ 640 sec = NULL; 641 } 642 } 643#endif 644 } else { 645 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 646 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 647 goto out_freebh; 648 649 sbi->s_high_sierra = 1; 650 opt.rock = 0; 651 h_pri = (struct hs_primary_descriptor *)vdp; 652 goto root_found; 653 } 654 } 655 656 /* Just skip any volume descriptors we don't recognize */ 657 658 brelse(bh); 659 bh = NULL; 660 } 661 /* 662 * If we fall through, either no volume descriptor was found, 663 * or else we passed a primary descriptor looking for others. 664 */ 665 if (!pri) 666 goto out_unknown_format; 667 brelse(bh); 668 bh = pri_bh; 669 pri_bh = NULL; 670 671root_found: 672 673 if (joliet_level && (pri == NULL || !opt.rock)) { 674 /* This is the case of Joliet with the norock mount flag. 675 * A disc with both Joliet and Rock Ridge is handled later 676 */ 677 pri = (struct iso_primary_descriptor *) sec; 678 } 679 680 if(sbi->s_high_sierra){ 681 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 682 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 683 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 684 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 685 } else { 686 if (!pri) 687 goto out_freebh; 688 rootp = (struct iso_directory_record *) pri->root_directory_record; 689 sbi->s_nzones = isonum_733(pri->volume_space_size); 690 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 691 sbi->s_max_size = isonum_733(pri->volume_space_size); 692 } 693 694 sbi->s_ninodes = 0; /* No way to figure this out easily */ 695 696 orig_zonesize = sbi->s_log_zone_size; 697 /* 698 * If the zone size is smaller than the hardware sector size, 699 * this is a fatal error. This would occur if the disc drive 700 * had sectors that were 2048 bytes, but the filesystem had 701 * blocks that were 512 bytes (which should only very rarely 702 * happen.) 703 */ 704 if (orig_zonesize < opt.blocksize) 705 goto out_bad_size; 706 707 /* RDE: convert log zone size to bit shift */ 708 switch (sbi->s_log_zone_size) { 709 case 512: sbi->s_log_zone_size = 9; break; 710 case 1024: sbi->s_log_zone_size = 10; break; 711 case 2048: sbi->s_log_zone_size = 11; break; 712 713 default: 714 goto out_bad_zone_size; 715 } 716 717 s->s_magic = ISOFS_SUPER_MAGIC; 718 719 /* 720 * With multi-extent files, file size is only limited by the maximum 721 * size of a file system, which is 8 TB. 722 */ 723 s->s_maxbytes = 0x80000000000LL; 724 725 /* 726 * The CDROM is read-only, has no nodes (devices) on it, and since 727 * all of the files appear to be owned by root, we really do not want 728 * to allow suid. (suid or devices will not show up unless we have 729 * Rock Ridge extensions) 730 */ 731 732 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */; 733 734 /* Set this for reference. Its not currently used except on write 735 which we don't have .. */ 736 737 first_data_zone = isonum_733(rootp->extent) + 738 isonum_711(rootp->ext_attr_length); 739 sbi->s_firstdatazone = first_data_zone; 740#ifndef BEQUIET 741 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 742 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 743 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 744 if(sbi->s_high_sierra) 745 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 746#endif 747 748 /* 749 * If the Joliet level is set, we _may_ decide to use the 750 * secondary descriptor, but can't be sure until after we 751 * read the root inode. But before reading the root inode 752 * we may need to change the device blocksize, and would 753 * rather release the old buffer first. So, we cache the 754 * first_data_zone value from the secondary descriptor. 755 */ 756 if (joliet_level) { 757 pri = (struct iso_primary_descriptor *) sec; 758 rootp = (struct iso_directory_record *) 759 pri->root_directory_record; 760 first_data_zone = isonum_733(rootp->extent) + 761 isonum_711(rootp->ext_attr_length); 762 } 763 764 /* 765 * We're all done using the volume descriptor, and may need 766 * to change the device blocksize, so release the buffer now. 767 */ 768 brelse(pri_bh); 769 brelse(bh); 770 771 /* 772 * Force the blocksize to 512 for 512 byte sectors. The file 773 * read primitives really get it wrong in a bad way if we don't 774 * do this. 775 * 776 * Note - we should never be setting the blocksize to something 777 * less than the hardware sector size for the device. If we 778 * do, we would end up having to read larger buffers and split 779 * out portions to satisfy requests. 780 * 781 * Note2- the idea here is that we want to deal with the optimal 782 * zonesize in the filesystem. If we have it set to something less, 783 * then we have horrible problems with trying to piece together 784 * bits of adjacent blocks in order to properly read directory 785 * entries. By forcing the blocksize in this way, we ensure 786 * that we will never be required to do this. 787 */ 788 sb_set_blocksize(s, orig_zonesize); 789 790 sbi->s_nls_iocharset = NULL; 791 792#ifdef CONFIG_JOLIET 793 if (joliet_level && opt.utf8 == 0) { 794 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 795 sbi->s_nls_iocharset = load_nls(p); 796 if (! sbi->s_nls_iocharset) { 797 /* Fail only if explicit charset specified */ 798 if (opt.iocharset) 799 goto out_freesbi; 800 sbi->s_nls_iocharset = load_nls_default(); 801 } 802 } 803#endif 804 s->s_op = &isofs_sops; 805 s->s_export_op = &isofs_export_ops; 806 sbi->s_mapping = opt.map; 807 sbi->s_rock = (opt.rock ? 2 : 0); 808 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 809 sbi->s_cruft = opt.cruft; 810 sbi->s_hide = opt.hide; 811 sbi->s_showassoc = opt.showassoc; 812 sbi->s_uid = opt.uid; 813 sbi->s_gid = opt.gid; 814 sbi->s_uid_set = opt.uid_set; 815 sbi->s_gid_set = opt.gid_set; 816 sbi->s_utf8 = opt.utf8; 817 sbi->s_nocompress = opt.nocompress; 818 sbi->s_overriderockperm = opt.overriderockperm; 819 /* 820 * It would be incredibly stupid to allow people to mark every file 821 * on the disk as suid, so we merely allow them to set the default 822 * permissions. 823 */ 824 if (opt.fmode != ISOFS_INVALID_MODE) 825 sbi->s_fmode = opt.fmode & 0777; 826 else 827 sbi->s_fmode = ISOFS_INVALID_MODE; 828 if (opt.dmode != ISOFS_INVALID_MODE) 829 sbi->s_dmode = opt.dmode & 0777; 830 else 831 sbi->s_dmode = ISOFS_INVALID_MODE; 832 833 /* 834 * Read the root inode, which _may_ result in changing 835 * the s_rock flag. Once we have the final s_rock value, 836 * we then decide whether to use the Joliet descriptor. 837 */ 838 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 839 if (IS_ERR(inode)) 840 goto out_no_root; 841 842 /* 843 * If this disk has both Rock Ridge and Joliet on it, then we 844 * want to use Rock Ridge by default. This can be overridden 845 * by using the norock mount option. There is still one other 846 * possibility that is not taken into account: a Rock Ridge 847 * CD with Unicode names. Until someone sees such a beast, it 848 * will not be supported. 849 */ 850 if (sbi->s_rock == 1) { 851 joliet_level = 0; 852 } else if (joliet_level) { 853 sbi->s_rock = 0; 854 if (sbi->s_firstdatazone != first_data_zone) { 855 sbi->s_firstdatazone = first_data_zone; 856 printk(KERN_DEBUG 857 "ISOFS: changing to secondary root\n"); 858 iput(inode); 859 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 860 if (IS_ERR(inode)) 861 goto out_no_root; 862 } 863 } 864 865 if (opt.check == 'u') { 866 /* Only Joliet is case insensitive by default */ 867 if (joliet_level) 868 opt.check = 'r'; 869 else 870 opt.check = 's'; 871 } 872 sbi->s_joliet_level = joliet_level; 873 874 /* Make sure the root inode is a directory */ 875 if (!S_ISDIR(inode->i_mode)) { 876 printk(KERN_WARNING 877 "isofs_fill_super: root inode is not a directory. " 878 "Corrupted media?\n"); 879 goto out_iput; 880 } 881 882 /* get the root dentry */ 883 s->s_root = d_alloc_root(inode); 884 if (!(s->s_root)) 885 goto out_no_root; 886 887 table = 0; 888 if (joliet_level) 889 table += 2; 890 if (opt.check == 'r') 891 table++; 892 s->s_root->d_op = &isofs_dentry_ops[table]; 893 894 kfree(opt.iocharset); 895 896 return 0; 897 898 /* 899 * Display error messages and free resources. 900 */ 901out_iput: 902 iput(inode); 903 goto out_no_inode; 904out_no_root: 905 error = PTR_ERR(inode); 906 if (error != -ENOMEM) 907 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 908out_no_inode: 909#ifdef CONFIG_JOLIET 910 unload_nls(sbi->s_nls_iocharset); 911#endif 912 goto out_freesbi; 913out_no_read: 914 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 915 __func__, s->s_id, iso_blknum, block); 916 goto out_freesbi; 917out_bad_zone_size: 918 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 919 sbi->s_log_zone_size); 920 goto out_freebh; 921out_bad_size: 922 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 923 orig_zonesize, opt.blocksize); 924 goto out_freebh; 925out_unknown_format: 926 if (!silent) 927 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 928 929out_freebh: 930 brelse(bh); 931out_freesbi: 932 kfree(opt.iocharset); 933 kfree(sbi); 934 s->s_fs_info = NULL; 935 return error; 936} 937 938static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 939{ 940 struct super_block *sb = dentry->d_sb; 941 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 942 943 buf->f_type = ISOFS_SUPER_MAGIC; 944 buf->f_bsize = sb->s_blocksize; 945 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 946 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 947 buf->f_bfree = 0; 948 buf->f_bavail = 0; 949 buf->f_files = ISOFS_SB(sb)->s_ninodes; 950 buf->f_ffree = 0; 951 buf->f_fsid.val[0] = (u32)id; 952 buf->f_fsid.val[1] = (u32)(id >> 32); 953 buf->f_namelen = NAME_MAX; 954 return 0; 955} 956 957/* 958 * Get a set of blocks; filling in buffer_heads if already allocated 959 * or getblk() if they are not. Returns the number of blocks inserted 960 * (-ve == error.) 961 */ 962int isofs_get_blocks(struct inode *inode, sector_t iblock_s, 963 struct buffer_head **bh, unsigned long nblocks) 964{ 965 unsigned long b_off; 966 unsigned offset, sect_size; 967 unsigned int firstext; 968 unsigned long nextblk, nextoff; 969 long iblock = (long)iblock_s; 970 int section, rv, error; 971 struct iso_inode_info *ei = ISOFS_I(inode); 972 973 lock_kernel(); 974 975 error = -EIO; 976 rv = 0; 977 if (iblock < 0 || iblock != iblock_s) { 978 printk(KERN_DEBUG "%s: block number too large\n", __func__); 979 goto abort; 980 } 981 982 b_off = iblock; 983 984 offset = 0; 985 firstext = ei->i_first_extent; 986 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 987 nextblk = ei->i_next_section_block; 988 nextoff = ei->i_next_section_offset; 989 section = 0; 990 991 while (nblocks) { 992 /* If we are *way* beyond the end of the file, print a message. 993 * Access beyond the end of the file up to the next page boundary 994 * is normal, however because of the way the page cache works. 995 * In this case, we just return 0 so that we can properly fill 996 * the page with useless information without generating any 997 * I/O errors. 998 */ 999 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1000 printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n", 1001 __func__, iblock, (unsigned long) inode->i_size); 1002 goto abort; 1003 } 1004 1005 /* On the last section, nextblk == 0, section size is likely to 1006 * exceed sect_size by a partial block, and access beyond the 1007 * end of the file will reach beyond the section size, too. 1008 */ 1009 while (nextblk && (b_off >= (offset + sect_size))) { 1010 struct inode *ninode; 1011 1012 offset += sect_size; 1013 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1014 if (IS_ERR(ninode)) { 1015 error = PTR_ERR(ninode); 1016 goto abort; 1017 } 1018 firstext = ISOFS_I(ninode)->i_first_extent; 1019 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1020 nextblk = ISOFS_I(ninode)->i_next_section_block; 1021 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1022 iput(ninode); 1023 1024 if (++section > 100) { 1025 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1026 " aborting...\n", __func__); 1027 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u " 1028 "nextblk=%lu nextoff=%lu\n", __func__, 1029 iblock, firstext, (unsigned) sect_size, 1030 nextblk, nextoff); 1031 goto abort; 1032 } 1033 } 1034 1035 if (*bh) { 1036 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1037 } else { 1038 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1039 if (!*bh) 1040 goto abort; 1041 } 1042 bh++; /* Next buffer head */ 1043 b_off++; /* Next buffer offset */ 1044 nblocks--; 1045 rv++; 1046 } 1047 1048 error = 0; 1049abort: 1050 unlock_kernel(); 1051 return rv != 0 ? rv : error; 1052} 1053 1054/* 1055 * Used by the standard interfaces. 1056 */ 1057static 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 1071static 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 1084struct 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 1092static int isofs_readpage(struct file *file, struct page *page) 1093{ 1094 return block_read_full_page(page,isofs_get_block); 1095} 1096 1097static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1098{ 1099 return generic_block_bmap(mapping,block,isofs_get_block); 1100} 1101 1102static const struct address_space_operations isofs_aops = { 1103 .readpage = isofs_readpage, 1104 .sync_page = block_sync_page, 1105 .bmap = _isofs_bmap 1106}; 1107 1108static 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); 1188out: 1189 kfree(tmpde); 1190 if (bh) 1191 brelse(bh); 1192 return 0; 1193 1194out_nomem: 1195 if (bh) 1196 brelse(bh); 1197 return -ENOMEM; 1198 1199out_noread: 1200 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1201 kfree(tmpde); 1202 return -EIO; 1203 1204out_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 1211static 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 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1392 1393 ret = 0; 1394out: 1395 kfree(tmpde); 1396 if (bh) 1397 brelse(bh); 1398 return ret; 1399 1400out_badread: 1401 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1402fail: 1403 goto out; 1404} 1405 1406struct isofs_iget5_callback_data { 1407 unsigned long block; 1408 unsigned long offset; 1409}; 1410 1411static int isofs_iget5_test(struct inode *ino, void *data) 1412{ 1413 struct iso_inode_info *i = ISOFS_I(ino); 1414 struct isofs_iget5_callback_data *d = 1415 (struct isofs_iget5_callback_data*)data; 1416 return (i->i_iget5_block == d->block) 1417 && (i->i_iget5_offset == d->offset); 1418} 1419 1420static int isofs_iget5_set(struct inode *ino, void *data) 1421{ 1422 struct iso_inode_info *i = ISOFS_I(ino); 1423 struct isofs_iget5_callback_data *d = 1424 (struct isofs_iget5_callback_data*)data; 1425 i->i_iget5_block = d->block; 1426 i->i_iget5_offset = d->offset; 1427 return 0; 1428} 1429 1430/* Store, in the inode's containing structure, the block and block 1431 * offset that point to the underlying meta-data for the inode. The 1432 * code below is otherwise similar to the iget() code in 1433 * include/linux/fs.h */ 1434struct inode *isofs_iget(struct super_block *sb, 1435 unsigned long block, 1436 unsigned long offset) 1437{ 1438 unsigned long hashval; 1439 struct inode *inode; 1440 struct isofs_iget5_callback_data data; 1441 long ret; 1442 1443 if (offset >= 1ul << sb->s_blocksize_bits) 1444 return ERR_PTR(-EINVAL); 1445 1446 data.block = block; 1447 data.offset = offset; 1448 1449 hashval = (block << sb->s_blocksize_bits) | offset; 1450 1451 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1452 &isofs_iget5_set, &data); 1453 1454 if (!inode) 1455 return ERR_PTR(-ENOMEM); 1456 1457 if (inode->i_state & I_NEW) { 1458 ret = isofs_read_inode(inode); 1459 if (ret < 0) { 1460 iget_failed(inode); 1461 inode = ERR_PTR(ret); 1462 } else { 1463 unlock_new_inode(inode); 1464 } 1465 } 1466 1467 return inode; 1468} 1469 1470static int isofs_get_sb(struct file_system_type *fs_type, 1471 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 1472{ 1473 return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super, 1474 mnt); 1475} 1476 1477static struct file_system_type iso9660_fs_type = { 1478 .owner = THIS_MODULE, 1479 .name = "iso9660", 1480 .get_sb = isofs_get_sb, 1481 .kill_sb = kill_block_super, 1482 .fs_flags = FS_REQUIRES_DEV, 1483}; 1484 1485static int __init init_iso9660_fs(void) 1486{ 1487 int err = init_inodecache(); 1488 if (err) 1489 goto out; 1490#ifdef CONFIG_ZISOFS 1491 err = zisofs_init(); 1492 if (err) 1493 goto out1; 1494#endif 1495 err = register_filesystem(&iso9660_fs_type); 1496 if (err) 1497 goto out2; 1498 return 0; 1499out2: 1500#ifdef CONFIG_ZISOFS 1501 zisofs_cleanup(); 1502out1: 1503#endif 1504 destroy_inodecache(); 1505out: 1506 return err; 1507} 1508 1509static void __exit exit_iso9660_fs(void) 1510{ 1511 unregister_filesystem(&iso9660_fs_type); 1512#ifdef CONFIG_ZISOFS 1513 zisofs_cleanup(); 1514#endif 1515 destroy_inodecache(); 1516} 1517 1518module_init(init_iso9660_fs) 1519module_exit(exit_iso9660_fs) 1520MODULE_LICENSE("GPL"); 1521/* Actual filesystem name is iso9660, as requested in filesystems.c */ 1522MODULE_ALIAS("iso9660"); 1523