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