1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * linux/fs/isofs/inode.c 4 * 5 * (C) 1991 Linus Torvalds - minix filesystem 6 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem. 7 * 1994 Eberhard Mönkeberg - multi session handling. 8 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs. 9 * 1997 Gordon Chaffee - Joliet CDs 10 * 1998 Eric Lammerts - ISO 9660 Level 3 11 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB 12 * 2004 Paul Serice - NFS Export Operations 13 */ 14 15#include <linux/init.h> 16#include <linux/module.h> 17 18#include <linux/slab.h> 19#include <linux/cred.h> 20#include <linux/nls.h> 21#include <linux/ctype.h> 22#include <linux/statfs.h> 23#include <linux/cdrom.h> 24#include <linux/parser.h> 25#include <linux/mpage.h> 26#include <linux/user_namespace.h> 27#include <linux/seq_file.h> 28#include <linux/blkdev.h> 29 30#include "isofs.h" 31#include "zisofs.h" 32 33/* max tz offset is 13 hours */ 34#define MAX_TZ_OFFSET (52*15*60) 35 36#define BEQUIET 37 38static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); 39static int isofs_dentry_cmpi(const struct dentry *dentry, 40 unsigned int len, const char *str, const struct qstr *name); 41 42#ifdef CONFIG_JOLIET 43static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); 44static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); 45static int isofs_dentry_cmpi_ms(const struct dentry *dentry, 46 unsigned int len, const char *str, const struct qstr *name); 47static int isofs_dentry_cmp_ms(const struct dentry *dentry, 48 unsigned int len, const char *str, const struct qstr *name); 49#endif 50 51static void isofs_put_super(struct super_block *sb) 52{ 53 struct isofs_sb_info *sbi = ISOFS_SB(sb); 54 55#ifdef CONFIG_JOLIET 56 unload_nls(sbi->s_nls_iocharset); 57#endif 58 59 kfree(sbi); 60 sb->s_fs_info = NULL; 61 return; 62} 63 64static int isofs_read_inode(struct inode *, int relocated); 65static int isofs_statfs (struct dentry *, struct kstatfs *); 66static int isofs_show_options(struct seq_file *, struct dentry *); 67 68static struct kmem_cache *isofs_inode_cachep; 69 70static struct inode *isofs_alloc_inode(struct super_block *sb) 71{ 72 struct iso_inode_info *ei; 73 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); 74 if (!ei) 75 return NULL; 76 return &ei->vfs_inode; 77} 78 79static void isofs_free_inode(struct inode *inode) 80{ 81 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 82} 83 84static void init_once(void *foo) 85{ 86 struct iso_inode_info *ei = foo; 87 88 inode_init_once(&ei->vfs_inode); 89} 90 91static int __init init_inodecache(void) 92{ 93 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", 94 sizeof(struct iso_inode_info), 95 0, (SLAB_RECLAIM_ACCOUNT| 96 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 97 init_once); 98 if (!isofs_inode_cachep) 99 return -ENOMEM; 100 return 0; 101} 102 103static void destroy_inodecache(void) 104{ 105 /* 106 * Make sure all delayed rcu free inodes are flushed before we 107 * destroy cache. 108 */ 109 rcu_barrier(); 110 kmem_cache_destroy(isofs_inode_cachep); 111} 112 113static int isofs_remount(struct super_block *sb, int *flags, char *data) 114{ 115 sync_filesystem(sb); 116 if (!(*flags & SB_RDONLY)) 117 return -EROFS; 118 return 0; 119} 120 121static const struct super_operations isofs_sops = { 122 .alloc_inode = isofs_alloc_inode, 123 .free_inode = isofs_free_inode, 124 .put_super = isofs_put_super, 125 .statfs = isofs_statfs, 126 .remount_fs = isofs_remount, 127 .show_options = isofs_show_options, 128}; 129 130 131static const struct dentry_operations isofs_dentry_ops[] = { 132 { 133 .d_hash = isofs_hashi, 134 .d_compare = isofs_dentry_cmpi, 135 }, 136#ifdef CONFIG_JOLIET 137 { 138 .d_hash = isofs_hash_ms, 139 .d_compare = isofs_dentry_cmp_ms, 140 }, 141 { 142 .d_hash = isofs_hashi_ms, 143 .d_compare = isofs_dentry_cmpi_ms, 144 }, 145#endif 146}; 147 148struct iso9660_options{ 149 unsigned int rock:1; 150 unsigned int joliet:1; 151 unsigned int cruft:1; 152 unsigned int hide:1; 153 unsigned int showassoc:1; 154 unsigned int nocompress:1; 155 unsigned int overriderockperm:1; 156 unsigned int uid_set:1; 157 unsigned int gid_set:1; 158 unsigned char map; 159 unsigned char check; 160 unsigned int blocksize; 161 umode_t fmode; 162 umode_t dmode; 163 kgid_t gid; 164 kuid_t uid; 165 char *iocharset; 166 /* LVE */ 167 s32 session; 168 s32 sbsector; 169}; 170 171/* 172 * Compute the hash for the isofs name corresponding to the dentry. 173 */ 174static int 175isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) 176{ 177 const char *name; 178 int len; 179 char c; 180 unsigned long hash; 181 182 len = qstr->len; 183 name = qstr->name; 184 if (ms) { 185 while (len && name[len-1] == '.') 186 len--; 187 } 188 189 hash = init_name_hash(dentry); 190 while (len--) { 191 c = tolower(*name++); 192 hash = partial_name_hash(c, hash); 193 } 194 qstr->hash = end_name_hash(hash); 195 196 return 0; 197} 198 199/* 200 * Compare of two isofs names. 201 */ 202static int isofs_dentry_cmp_common( 203 unsigned int len, const char *str, 204 const struct qstr *name, int ms, int ci) 205{ 206 int alen, blen; 207 208 /* A filename cannot end in '.' or we treat it like it has none */ 209 alen = name->len; 210 blen = len; 211 if (ms) { 212 while (alen && name->name[alen-1] == '.') 213 alen--; 214 while (blen && str[blen-1] == '.') 215 blen--; 216 } 217 if (alen == blen) { 218 if (ci) { 219 if (strncasecmp(name->name, str, alen) == 0) 220 return 0; 221 } else { 222 if (strncmp(name->name, str, alen) == 0) 223 return 0; 224 } 225 } 226 return 1; 227} 228 229static int 230isofs_hashi(const struct dentry *dentry, struct qstr *qstr) 231{ 232 return isofs_hashi_common(dentry, qstr, 0); 233} 234 235static int 236isofs_dentry_cmpi(const struct dentry *dentry, 237 unsigned int len, const char *str, const struct qstr *name) 238{ 239 return isofs_dentry_cmp_common(len, str, name, 0, 1); 240} 241 242#ifdef CONFIG_JOLIET 243/* 244 * Compute the hash for the isofs name corresponding to the dentry. 245 */ 246static int 247isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) 248{ 249 const char *name; 250 int len; 251 252 len = qstr->len; 253 name = qstr->name; 254 if (ms) { 255 while (len && name[len-1] == '.') 256 len--; 257 } 258 259 qstr->hash = full_name_hash(dentry, name, len); 260 261 return 0; 262} 263 264static int 265isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) 266{ 267 return isofs_hash_common(dentry, qstr, 1); 268} 269 270static int 271isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) 272{ 273 return isofs_hashi_common(dentry, qstr, 1); 274} 275 276static int 277isofs_dentry_cmp_ms(const struct dentry *dentry, 278 unsigned int len, const char *str, const struct qstr *name) 279{ 280 return isofs_dentry_cmp_common(len, str, name, 1, 0); 281} 282 283static int 284isofs_dentry_cmpi_ms(const struct dentry *dentry, 285 unsigned int len, const char *str, const struct qstr *name) 286{ 287 return isofs_dentry_cmp_common(len, str, name, 1, 1); 288} 289#endif 290 291enum { 292 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, 293 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, 294 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, 295 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, 296}; 297 298static const match_table_t tokens = { 299 {Opt_norock, "norock"}, 300 {Opt_nojoliet, "nojoliet"}, 301 {Opt_unhide, "unhide"}, 302 {Opt_hide, "hide"}, 303 {Opt_showassoc, "showassoc"}, 304 {Opt_cruft, "cruft"}, 305 {Opt_utf8, "utf8"}, 306 {Opt_iocharset, "iocharset=%s"}, 307 {Opt_map_a, "map=acorn"}, 308 {Opt_map_a, "map=a"}, 309 {Opt_map_n, "map=normal"}, 310 {Opt_map_n, "map=n"}, 311 {Opt_map_o, "map=off"}, 312 {Opt_map_o, "map=o"}, 313 {Opt_session, "session=%u"}, 314 {Opt_sb, "sbsector=%u"}, 315 {Opt_check_r, "check=relaxed"}, 316 {Opt_check_r, "check=r"}, 317 {Opt_check_s, "check=strict"}, 318 {Opt_check_s, "check=s"}, 319 {Opt_uid, "uid=%u"}, 320 {Opt_gid, "gid=%u"}, 321 {Opt_mode, "mode=%u"}, 322 {Opt_dmode, "dmode=%u"}, 323 {Opt_overriderockperm, "overriderockperm"}, 324 {Opt_block, "block=%u"}, 325 {Opt_ignore, "conv=binary"}, 326 {Opt_ignore, "conv=b"}, 327 {Opt_ignore, "conv=text"}, 328 {Opt_ignore, "conv=t"}, 329 {Opt_ignore, "conv=mtext"}, 330 {Opt_ignore, "conv=m"}, 331 {Opt_ignore, "conv=auto"}, 332 {Opt_ignore, "conv=a"}, 333 {Opt_nocompress, "nocompress"}, 334 {Opt_err, NULL} 335}; 336 337static int parse_options(char *options, struct iso9660_options *popt) 338{ 339 char *p; 340 int option; 341 342 popt->map = 'n'; 343 popt->rock = 1; 344 popt->joliet = 1; 345 popt->cruft = 0; 346 popt->hide = 0; 347 popt->showassoc = 0; 348 popt->check = 'u'; /* unset */ 349 popt->nocompress = 0; 350 popt->blocksize = 1024; 351 popt->fmode = popt->dmode = ISOFS_INVALID_MODE; 352 popt->uid_set = 0; 353 popt->gid_set = 0; 354 popt->gid = GLOBAL_ROOT_GID; 355 popt->uid = GLOBAL_ROOT_UID; 356 popt->iocharset = NULL; 357 popt->overriderockperm = 0; 358 popt->session=-1; 359 popt->sbsector=-1; 360 if (!options) 361 return 1; 362 363 while ((p = strsep(&options, ",")) != NULL) { 364 int token; 365 substring_t args[MAX_OPT_ARGS]; 366 unsigned n; 367 368 if (!*p) 369 continue; 370 371 token = match_token(p, tokens, args); 372 switch (token) { 373 case Opt_norock: 374 popt->rock = 0; 375 break; 376 case Opt_nojoliet: 377 popt->joliet = 0; 378 break; 379 case Opt_hide: 380 popt->hide = 1; 381 break; 382 case Opt_unhide: 383 case Opt_showassoc: 384 popt->showassoc = 1; 385 break; 386 case Opt_cruft: 387 popt->cruft = 1; 388 break; 389#ifdef CONFIG_JOLIET 390 case Opt_utf8: 391 kfree(popt->iocharset); 392 popt->iocharset = kstrdup("utf8", GFP_KERNEL); 393 if (!popt->iocharset) 394 return 0; 395 break; 396 case Opt_iocharset: 397 kfree(popt->iocharset); 398 popt->iocharset = match_strdup(&args[0]); 399 if (!popt->iocharset) 400 return 0; 401 break; 402#endif 403 case Opt_map_a: 404 popt->map = 'a'; 405 break; 406 case Opt_map_o: 407 popt->map = 'o'; 408 break; 409 case Opt_map_n: 410 popt->map = 'n'; 411 break; 412 case Opt_session: 413 if (match_int(&args[0], &option)) 414 return 0; 415 n = option; 416 /* 417 * Track numbers are supposed to be in range 1-99, the 418 * mount option starts indexing at 0. 419 */ 420 if (n >= 99) 421 return 0; 422 popt->session = n + 1; 423 break; 424 case Opt_sb: 425 if (match_int(&args[0], &option)) 426 return 0; 427 popt->sbsector = option; 428 break; 429 case Opt_check_r: 430 popt->check = 'r'; 431 break; 432 case Opt_check_s: 433 popt->check = 's'; 434 break; 435 case Opt_ignore: 436 break; 437 case Opt_uid: 438 if (match_int(&args[0], &option)) 439 return 0; 440 popt->uid = make_kuid(current_user_ns(), option); 441 if (!uid_valid(popt->uid)) 442 return 0; 443 popt->uid_set = 1; 444 break; 445 case Opt_gid: 446 if (match_int(&args[0], &option)) 447 return 0; 448 popt->gid = make_kgid(current_user_ns(), option); 449 if (!gid_valid(popt->gid)) 450 return 0; 451 popt->gid_set = 1; 452 break; 453 case Opt_mode: 454 if (match_int(&args[0], &option)) 455 return 0; 456 popt->fmode = option; 457 break; 458 case Opt_dmode: 459 if (match_int(&args[0], &option)) 460 return 0; 461 popt->dmode = option; 462 break; 463 case Opt_overriderockperm: 464 popt->overriderockperm = 1; 465 break; 466 case Opt_block: 467 if (match_int(&args[0], &option)) 468 return 0; 469 n = option; 470 if (n != 512 && n != 1024 && n != 2048) 471 return 0; 472 popt->blocksize = n; 473 break; 474 case Opt_nocompress: 475 popt->nocompress = 1; 476 break; 477 default: 478 return 0; 479 } 480 } 481 return 1; 482} 483 484/* 485 * Display the mount options in /proc/mounts. 486 */ 487static int isofs_show_options(struct seq_file *m, struct dentry *root) 488{ 489 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 490 491 if (!sbi->s_rock) seq_puts(m, ",norock"); 492 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 493 if (sbi->s_cruft) seq_puts(m, ",cruft"); 494 if (sbi->s_hide) seq_puts(m, ",hide"); 495 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 496 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 497 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 498 499 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 500 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 501 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 502 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 503 504 if (root->d_sb->s_blocksize != 1024) 505 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 506 507 if (sbi->s_uid_set) 508 seq_printf(m, ",uid=%u", 509 from_kuid_munged(&init_user_ns, sbi->s_uid)); 510 if (sbi->s_gid_set) 511 seq_printf(m, ",gid=%u", 512 from_kgid_munged(&init_user_ns, sbi->s_gid)); 513 514 if (sbi->s_dmode != ISOFS_INVALID_MODE) 515 seq_printf(m, ",dmode=%o", sbi->s_dmode); 516 if (sbi->s_fmode != ISOFS_INVALID_MODE) 517 seq_printf(m, ",fmode=%o", sbi->s_fmode); 518 519#ifdef CONFIG_JOLIET 520 if (sbi->s_nls_iocharset) 521 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 522 else 523 seq_puts(m, ",iocharset=utf8"); 524#endif 525 return 0; 526} 527 528/* 529 * look if the driver can tell the multi session redirection value 530 * 531 * don't change this if you don't know what you do, please! 532 * Multisession is legal only with XA disks. 533 * A non-XA disk with more than one volume descriptor may do it right, but 534 * usually is written in a nowhere standardized "multi-partition" manner. 535 * Multisession uses absolute addressing (solely the first frame of the whole 536 * track is #0), multi-partition uses relative addressing (each first frame of 537 * each track is #0), and a track is not a session. 538 * 539 * A broken CDwriter software or drive firmware does not set new standards, 540 * at least not if conflicting with the existing ones. 541 * 542 * emoenke@gwdg.de 543 */ 544#define WE_OBEY_THE_WRITTEN_STANDARDS 1 545 546static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 547{ 548 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); 549 unsigned int vol_desc_start = 0; 550 551 if (session > 0) { 552 struct cdrom_tocentry te; 553 554 if (!cdi) 555 return 0; 556 557 te.cdte_track = session; 558 te.cdte_format = CDROM_LBA; 559 if (cdrom_read_tocentry(cdi, &te) == 0) { 560 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 561 session, te.cdte_addr.lba, 562 te.cdte_ctrl & CDROM_DATA_TRACK); 563 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4) 564 return te.cdte_addr.lba; 565 } 566 567 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 568 } 569 570 if (cdi) { 571 struct cdrom_multisession ms_info; 572 573 ms_info.addr_format = CDROM_LBA; 574 if (cdrom_multisession(cdi, &ms_info) == 0) { 575#if WE_OBEY_THE_WRITTEN_STANDARDS 576 /* necessary for a valid ms_info.addr */ 577 if (ms_info.xa_flag) 578#endif 579 vol_desc_start = ms_info.addr.lba; 580 } 581 } 582 583 return vol_desc_start; 584} 585 586/* 587 * Check if root directory is empty (has less than 3 files). 588 * 589 * Used to detect broken CDs where ISO root directory is empty but Joliet root 590 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 591 * (and Joliet used instead) or else no files would be visible. 592 */ 593static bool rootdir_empty(struct super_block *sb, unsigned long block) 594{ 595 int offset = 0, files = 0, de_len; 596 struct iso_directory_record *de; 597 struct buffer_head *bh; 598 599 bh = sb_bread(sb, block); 600 if (!bh) 601 return true; 602 while (files < 3) { 603 de = (struct iso_directory_record *) (bh->b_data + offset); 604 de_len = *(unsigned char *) de; 605 if (de_len == 0) 606 break; 607 files++; 608 offset += de_len; 609 } 610 brelse(bh); 611 return files < 3; 612} 613 614/* 615 * Initialize the superblock and read the root inode. 616 */ 617static int isofs_fill_super(struct super_block *s, void *data, int silent) 618{ 619 struct buffer_head *bh = NULL, *pri_bh = NULL; 620 struct hs_primary_descriptor *h_pri = NULL; 621 struct iso_primary_descriptor *pri = NULL; 622 struct iso_supplementary_descriptor *sec = NULL; 623 struct iso_directory_record *rootp; 624 struct inode *inode; 625 struct iso9660_options opt; 626 struct isofs_sb_info *sbi; 627 unsigned long first_data_zone; 628 int joliet_level = 0; 629 int iso_blknum, block; 630 int orig_zonesize; 631 int table, error = -EINVAL; 632 unsigned int vol_desc_start; 633 634 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 635 if (!sbi) 636 return -ENOMEM; 637 s->s_fs_info = sbi; 638 639 if (!parse_options((char *)data, &opt)) 640 goto out_freesbi; 641 642 /* 643 * First of all, get the hardware blocksize for this device. 644 * If we don't know what it is, or the hardware blocksize is 645 * larger than the blocksize the user specified, then use 646 * that value. 647 */ 648 /* 649 * What if bugger tells us to go beyond page size? 650 */ 651 if (bdev_logical_block_size(s->s_bdev) > 2048) { 652 printk(KERN_WARNING 653 "ISOFS: unsupported/invalid hardware sector size %d\n", 654 bdev_logical_block_size(s->s_bdev)); 655 goto out_freesbi; 656 } 657 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 658 659 sbi->s_high_sierra = 0; /* default is iso9660 */ 660 sbi->s_session = opt.session; 661 sbi->s_sbsector = opt.sbsector; 662 663 vol_desc_start = (opt.sbsector != -1) ? 664 opt.sbsector : isofs_get_last_session(s,opt.session); 665 666 for (iso_blknum = vol_desc_start+16; 667 iso_blknum < vol_desc_start+100; iso_blknum++) { 668 struct hs_volume_descriptor *hdp; 669 struct iso_volume_descriptor *vdp; 670 671 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 672 if (!(bh = sb_bread(s, block))) 673 goto out_no_read; 674 675 vdp = (struct iso_volume_descriptor *)bh->b_data; 676 hdp = (struct hs_volume_descriptor *)bh->b_data; 677 678 /* 679 * Due to the overlapping physical location of the descriptors, 680 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 681 * proper identification in this case, we first check for ISO. 682 */ 683 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 684 if (isonum_711(vdp->type) == ISO_VD_END) 685 break; 686 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 687 if (!pri) { 688 pri = (struct iso_primary_descriptor *)vdp; 689 /* Save the buffer in case we need it ... */ 690 pri_bh = bh; 691 bh = NULL; 692 } 693 } 694#ifdef CONFIG_JOLIET 695 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 696 sec = (struct iso_supplementary_descriptor *)vdp; 697 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 698 if (opt.joliet) { 699 if (sec->escape[2] == 0x40) 700 joliet_level = 1; 701 else if (sec->escape[2] == 0x43) 702 joliet_level = 2; 703 else if (sec->escape[2] == 0x45) 704 joliet_level = 3; 705 706 printk(KERN_DEBUG "ISO 9660 Extensions: " 707 "Microsoft Joliet Level %d\n", 708 joliet_level); 709 } 710 goto root_found; 711 } else { 712 /* Unknown supplementary volume descriptor */ 713 sec = NULL; 714 } 715 } 716#endif 717 } else { 718 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 719 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 720 goto out_freebh; 721 722 sbi->s_high_sierra = 1; 723 opt.rock = 0; 724 h_pri = (struct hs_primary_descriptor *)vdp; 725 goto root_found; 726 } 727 } 728 729 /* Just skip any volume descriptors we don't recognize */ 730 731 brelse(bh); 732 bh = NULL; 733 } 734 /* 735 * If we fall through, either no volume descriptor was found, 736 * or else we passed a primary descriptor looking for others. 737 */ 738 if (!pri) 739 goto out_unknown_format; 740 brelse(bh); 741 bh = pri_bh; 742 pri_bh = NULL; 743 744root_found: 745 /* We don't support read-write mounts */ 746 if (!sb_rdonly(s)) { 747 error = -EACCES; 748 goto out_freebh; 749 } 750 751 if (joliet_level && (!pri || !opt.rock)) { 752 /* This is the case of Joliet with the norock mount flag. 753 * A disc with both Joliet and Rock Ridge is handled later 754 */ 755 pri = (struct iso_primary_descriptor *) sec; 756 } 757 758 if(sbi->s_high_sierra){ 759 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 760 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 761 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 762 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 763 } else { 764 if (!pri) 765 goto out_freebh; 766 rootp = (struct iso_directory_record *) pri->root_directory_record; 767 sbi->s_nzones = isonum_733(pri->volume_space_size); 768 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 769 sbi->s_max_size = isonum_733(pri->volume_space_size); 770 } 771 772 sbi->s_ninodes = 0; /* No way to figure this out easily */ 773 774 orig_zonesize = sbi->s_log_zone_size; 775 /* 776 * If the zone size is smaller than the hardware sector size, 777 * this is a fatal error. This would occur if the disc drive 778 * had sectors that were 2048 bytes, but the filesystem had 779 * blocks that were 512 bytes (which should only very rarely 780 * happen.) 781 */ 782 if (orig_zonesize < opt.blocksize) 783 goto out_bad_size; 784 785 /* RDE: convert log zone size to bit shift */ 786 switch (sbi->s_log_zone_size) { 787 case 512: sbi->s_log_zone_size = 9; break; 788 case 1024: sbi->s_log_zone_size = 10; break; 789 case 2048: sbi->s_log_zone_size = 11; break; 790 791 default: 792 goto out_bad_zone_size; 793 } 794 795 s->s_magic = ISOFS_SUPER_MAGIC; 796 797 /* 798 * With multi-extent files, file size is only limited by the maximum 799 * size of a file system, which is 8 TB. 800 */ 801 s->s_maxbytes = 0x80000000000LL; 802 803 /* ECMA-119 timestamp from 1900/1/1 with tz offset */ 804 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET; 805 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET; 806 807 /* Set this for reference. Its not currently used except on write 808 which we don't have .. */ 809 810 first_data_zone = isonum_733(rootp->extent) + 811 isonum_711(rootp->ext_attr_length); 812 sbi->s_firstdatazone = first_data_zone; 813#ifndef BEQUIET 814 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 815 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 816 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 817 if(sbi->s_high_sierra) 818 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 819#endif 820 821 /* 822 * If the Joliet level is set, we _may_ decide to use the 823 * secondary descriptor, but can't be sure until after we 824 * read the root inode. But before reading the root inode 825 * we may need to change the device blocksize, and would 826 * rather release the old buffer first. So, we cache the 827 * first_data_zone value from the secondary descriptor. 828 */ 829 if (joliet_level) { 830 pri = (struct iso_primary_descriptor *) sec; 831 rootp = (struct iso_directory_record *) 832 pri->root_directory_record; 833 first_data_zone = isonum_733(rootp->extent) + 834 isonum_711(rootp->ext_attr_length); 835 } 836 837 /* 838 * We're all done using the volume descriptor, and may need 839 * to change the device blocksize, so release the buffer now. 840 */ 841 brelse(pri_bh); 842 brelse(bh); 843 844 /* 845 * Force the blocksize to 512 for 512 byte sectors. The file 846 * read primitives really get it wrong in a bad way if we don't 847 * do this. 848 * 849 * Note - we should never be setting the blocksize to something 850 * less than the hardware sector size for the device. If we 851 * do, we would end up having to read larger buffers and split 852 * out portions to satisfy requests. 853 * 854 * Note2- the idea here is that we want to deal with the optimal 855 * zonesize in the filesystem. If we have it set to something less, 856 * then we have horrible problems with trying to piece together 857 * bits of adjacent blocks in order to properly read directory 858 * entries. By forcing the blocksize in this way, we ensure 859 * that we will never be required to do this. 860 */ 861 sb_set_blocksize(s, orig_zonesize); 862 863 sbi->s_nls_iocharset = NULL; 864 865#ifdef CONFIG_JOLIET 866 if (joliet_level) { 867 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 868 if (strcmp(p, "utf8") != 0) { 869 sbi->s_nls_iocharset = opt.iocharset ? 870 load_nls(opt.iocharset) : load_nls_default(); 871 if (!sbi->s_nls_iocharset) 872 goto out_freesbi; 873 } 874 } 875#endif 876 s->s_op = &isofs_sops; 877 s->s_export_op = &isofs_export_ops; 878 sbi->s_mapping = opt.map; 879 sbi->s_rock = (opt.rock ? 2 : 0); 880 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 881 sbi->s_cruft = opt.cruft; 882 sbi->s_hide = opt.hide; 883 sbi->s_showassoc = opt.showassoc; 884 sbi->s_uid = opt.uid; 885 sbi->s_gid = opt.gid; 886 sbi->s_uid_set = opt.uid_set; 887 sbi->s_gid_set = opt.gid_set; 888 sbi->s_nocompress = opt.nocompress; 889 sbi->s_overriderockperm = opt.overriderockperm; 890 /* 891 * It would be incredibly stupid to allow people to mark every file 892 * on the disk as suid, so we merely allow them to set the default 893 * permissions. 894 */ 895 if (opt.fmode != ISOFS_INVALID_MODE) 896 sbi->s_fmode = opt.fmode & 0777; 897 else 898 sbi->s_fmode = ISOFS_INVALID_MODE; 899 if (opt.dmode != ISOFS_INVALID_MODE) 900 sbi->s_dmode = opt.dmode & 0777; 901 else 902 sbi->s_dmode = ISOFS_INVALID_MODE; 903 904 /* 905 * Read the root inode, which _may_ result in changing 906 * the s_rock flag. Once we have the final s_rock value, 907 * we then decide whether to use the Joliet descriptor. 908 */ 909 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 910 if (IS_ERR(inode)) 911 goto out_no_root; 912 913 /* 914 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 915 * correct Joliet root directory. 916 */ 917 if (sbi->s_rock == 1 && joliet_level && 918 rootdir_empty(s, sbi->s_firstdatazone)) { 919 printk(KERN_NOTICE 920 "ISOFS: primary root directory is empty. " 921 "Disabling Rock Ridge and switching to Joliet."); 922 sbi->s_rock = 0; 923 } 924 925 /* 926 * If this disk has both Rock Ridge and Joliet on it, then we 927 * want to use Rock Ridge by default. This can be overridden 928 * by using the norock mount option. There is still one other 929 * possibility that is not taken into account: a Rock Ridge 930 * CD with Unicode names. Until someone sees such a beast, it 931 * will not be supported. 932 */ 933 if (sbi->s_rock == 1) { 934 joliet_level = 0; 935 } else if (joliet_level) { 936 sbi->s_rock = 0; 937 if (sbi->s_firstdatazone != first_data_zone) { 938 sbi->s_firstdatazone = first_data_zone; 939 printk(KERN_DEBUG 940 "ISOFS: changing to secondary root\n"); 941 iput(inode); 942 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 943 if (IS_ERR(inode)) 944 goto out_no_root; 945 } 946 } 947 948 if (opt.check == 'u') { 949 /* Only Joliet is case insensitive by default */ 950 if (joliet_level) 951 opt.check = 'r'; 952 else 953 opt.check = 's'; 954 } 955 sbi->s_joliet_level = joliet_level; 956 957 /* Make sure the root inode is a directory */ 958 if (!S_ISDIR(inode->i_mode)) { 959 printk(KERN_WARNING 960 "isofs_fill_super: root inode is not a directory. " 961 "Corrupted media?\n"); 962 goto out_iput; 963 } 964 965 table = 0; 966 if (joliet_level) 967 table += 2; 968 if (opt.check == 'r') 969 table++; 970 sbi->s_check = opt.check; 971 972 if (table) 973 s->s_d_op = &isofs_dentry_ops[table - 1]; 974 975 /* get the root dentry */ 976 s->s_root = d_make_root(inode); 977 if (!(s->s_root)) { 978 error = -ENOMEM; 979 goto out_no_inode; 980 } 981 982 kfree(opt.iocharset); 983 984 return 0; 985 986 /* 987 * Display error messages and free resources. 988 */ 989out_iput: 990 iput(inode); 991 goto out_no_inode; 992out_no_root: 993 error = PTR_ERR(inode); 994 if (error != -ENOMEM) 995 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 996out_no_inode: 997#ifdef CONFIG_JOLIET 998 unload_nls(sbi->s_nls_iocharset); 999#endif 1000 goto out_freesbi; 1001out_no_read: 1002 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 1003 __func__, s->s_id, iso_blknum, block); 1004 goto out_freebh; 1005out_bad_zone_size: 1006 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 1007 sbi->s_log_zone_size); 1008 goto out_freebh; 1009out_bad_size: 1010 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 1011 orig_zonesize, opt.blocksize); 1012 goto out_freebh; 1013out_unknown_format: 1014 if (!silent) 1015 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1016 1017out_freebh: 1018 brelse(bh); 1019 brelse(pri_bh); 1020out_freesbi: 1021 kfree(opt.iocharset); 1022 kfree(sbi); 1023 s->s_fs_info = NULL; 1024 return error; 1025} 1026 1027static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1028{ 1029 struct super_block *sb = dentry->d_sb; 1030 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1031 1032 buf->f_type = ISOFS_SUPER_MAGIC; 1033 buf->f_bsize = sb->s_blocksize; 1034 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1035 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1036 buf->f_bfree = 0; 1037 buf->f_bavail = 0; 1038 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1039 buf->f_ffree = 0; 1040 buf->f_fsid = u64_to_fsid(id); 1041 buf->f_namelen = NAME_MAX; 1042 return 0; 1043} 1044 1045/* 1046 * Get a set of blocks; filling in buffer_heads if already allocated 1047 * or getblk() if they are not. Returns the number of blocks inserted 1048 * (-ve == error.) 1049 */ 1050int isofs_get_blocks(struct inode *inode, sector_t iblock, 1051 struct buffer_head **bh, unsigned long nblocks) 1052{ 1053 unsigned long b_off = iblock; 1054 unsigned offset, sect_size; 1055 unsigned int firstext; 1056 unsigned long nextblk, nextoff; 1057 int section, rv, error; 1058 struct iso_inode_info *ei = ISOFS_I(inode); 1059 1060 error = -EIO; 1061 rv = 0; 1062 if (iblock != b_off) { 1063 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1064 goto abort; 1065 } 1066 1067 1068 offset = 0; 1069 firstext = ei->i_first_extent; 1070 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1071 nextblk = ei->i_next_section_block; 1072 nextoff = ei->i_next_section_offset; 1073 section = 0; 1074 1075 while (nblocks) { 1076 /* If we are *way* beyond the end of the file, print a message. 1077 * Access beyond the end of the file up to the next page boundary 1078 * is normal, however because of the way the page cache works. 1079 * In this case, we just return 0 so that we can properly fill 1080 * the page with useless information without generating any 1081 * I/O errors. 1082 */ 1083 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1084 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1085 __func__, b_off, 1086 (unsigned long long)inode->i_size); 1087 goto abort; 1088 } 1089 1090 /* On the last section, nextblk == 0, section size is likely to 1091 * exceed sect_size by a partial block, and access beyond the 1092 * end of the file will reach beyond the section size, too. 1093 */ 1094 while (nextblk && (b_off >= (offset + sect_size))) { 1095 struct inode *ninode; 1096 1097 offset += sect_size; 1098 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1099 if (IS_ERR(ninode)) { 1100 error = PTR_ERR(ninode); 1101 goto abort; 1102 } 1103 firstext = ISOFS_I(ninode)->i_first_extent; 1104 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1105 nextblk = ISOFS_I(ninode)->i_next_section_block; 1106 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1107 iput(ninode); 1108 1109 if (++section > 100) { 1110 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1111 " aborting...\n", __func__); 1112 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1113 "nextblk=%lu nextoff=%lu\n", __func__, 1114 b_off, firstext, (unsigned) sect_size, 1115 nextblk, nextoff); 1116 goto abort; 1117 } 1118 } 1119 1120 if (*bh) { 1121 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1122 } else { 1123 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1124 if (!*bh) 1125 goto abort; 1126 } 1127 bh++; /* Next buffer head */ 1128 b_off++; /* Next buffer offset */ 1129 nblocks--; 1130 rv++; 1131 } 1132 1133 error = 0; 1134abort: 1135 return rv != 0 ? rv : error; 1136} 1137 1138/* 1139 * Used by the standard interfaces. 1140 */ 1141static int isofs_get_block(struct inode *inode, sector_t iblock, 1142 struct buffer_head *bh_result, int create) 1143{ 1144 int ret; 1145 1146 if (create) { 1147 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1148 return -EROFS; 1149 } 1150 1151 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1152 return ret < 0 ? ret : 0; 1153} 1154 1155static int isofs_bmap(struct inode *inode, sector_t block) 1156{ 1157 struct buffer_head dummy; 1158 int error; 1159 1160 dummy.b_state = 0; 1161 dummy.b_blocknr = -1000; 1162 error = isofs_get_block(inode, block, &dummy, 0); 1163 if (!error) 1164 return dummy.b_blocknr; 1165 return 0; 1166} 1167 1168struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1169{ 1170 sector_t blknr = isofs_bmap(inode, block); 1171 if (!blknr) 1172 return NULL; 1173 return sb_bread(inode->i_sb, blknr); 1174} 1175 1176static int isofs_readpage(struct file *file, struct page *page) 1177{ 1178 return mpage_readpage(page, isofs_get_block); 1179} 1180 1181static void isofs_readahead(struct readahead_control *rac) 1182{ 1183 mpage_readahead(rac, isofs_get_block); 1184} 1185 1186static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1187{ 1188 return generic_block_bmap(mapping,block,isofs_get_block); 1189} 1190 1191static const struct address_space_operations isofs_aops = { 1192 .readpage = isofs_readpage, 1193 .readahead = isofs_readahead, 1194 .bmap = _isofs_bmap 1195}; 1196 1197static int isofs_read_level3_size(struct inode *inode) 1198{ 1199 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1200 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1201 struct buffer_head *bh = NULL; 1202 unsigned long block, offset, block_saved, offset_saved; 1203 int i = 0; 1204 int more_entries = 0; 1205 struct iso_directory_record *tmpde = NULL; 1206 struct iso_inode_info *ei = ISOFS_I(inode); 1207 1208 inode->i_size = 0; 1209 1210 /* The first 16 blocks are reserved as the System Area. Thus, 1211 * no inodes can appear in block 0. We use this to flag that 1212 * this is the last section. */ 1213 ei->i_next_section_block = 0; 1214 ei->i_next_section_offset = 0; 1215 1216 block = ei->i_iget5_block; 1217 offset = ei->i_iget5_offset; 1218 1219 do { 1220 struct iso_directory_record *de; 1221 unsigned int de_len; 1222 1223 if (!bh) { 1224 bh = sb_bread(inode->i_sb, block); 1225 if (!bh) 1226 goto out_noread; 1227 } 1228 de = (struct iso_directory_record *) (bh->b_data + offset); 1229 de_len = *(unsigned char *) de; 1230 1231 if (de_len == 0) { 1232 brelse(bh); 1233 bh = NULL; 1234 ++block; 1235 offset = 0; 1236 continue; 1237 } 1238 1239 block_saved = block; 1240 offset_saved = offset; 1241 offset += de_len; 1242 1243 /* Make sure we have a full directory entry */ 1244 if (offset >= bufsize) { 1245 int slop = bufsize - offset + de_len; 1246 if (!tmpde) { 1247 tmpde = kmalloc(256, GFP_KERNEL); 1248 if (!tmpde) 1249 goto out_nomem; 1250 } 1251 memcpy(tmpde, de, slop); 1252 offset &= bufsize - 1; 1253 block++; 1254 brelse(bh); 1255 bh = NULL; 1256 if (offset) { 1257 bh = sb_bread(inode->i_sb, block); 1258 if (!bh) 1259 goto out_noread; 1260 memcpy((void *)tmpde+slop, bh->b_data, offset); 1261 } 1262 de = tmpde; 1263 } 1264 1265 inode->i_size += isonum_733(de->size); 1266 if (i == 1) { 1267 ei->i_next_section_block = block_saved; 1268 ei->i_next_section_offset = offset_saved; 1269 } 1270 1271 more_entries = de->flags[-high_sierra] & 0x80; 1272 1273 i++; 1274 if (i > 100) 1275 goto out_toomany; 1276 } while (more_entries); 1277out: 1278 kfree(tmpde); 1279 if (bh) 1280 brelse(bh); 1281 return 0; 1282 1283out_nomem: 1284 if (bh) 1285 brelse(bh); 1286 return -ENOMEM; 1287 1288out_noread: 1289 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1290 kfree(tmpde); 1291 return -EIO; 1292 1293out_toomany: 1294 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1295 "isofs_read_level3_size: inode=%lu\n", 1296 __func__, inode->i_ino); 1297 goto out; 1298} 1299 1300static int isofs_read_inode(struct inode *inode, int relocated) 1301{ 1302 struct super_block *sb = inode->i_sb; 1303 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1304 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1305 unsigned long block; 1306 int high_sierra = sbi->s_high_sierra; 1307 struct buffer_head *bh; 1308 struct iso_directory_record *de; 1309 struct iso_directory_record *tmpde = NULL; 1310 unsigned int de_len; 1311 unsigned long offset; 1312 struct iso_inode_info *ei = ISOFS_I(inode); 1313 int ret = -EIO; 1314 1315 block = ei->i_iget5_block; 1316 bh = sb_bread(inode->i_sb, block); 1317 if (!bh) 1318 goto out_badread; 1319 1320 offset = ei->i_iget5_offset; 1321 1322 de = (struct iso_directory_record *) (bh->b_data + offset); 1323 de_len = *(unsigned char *) de; 1324 if (de_len < sizeof(struct iso_directory_record)) 1325 goto fail; 1326 1327 if (offset + de_len > bufsize) { 1328 int frag1 = bufsize - offset; 1329 1330 tmpde = kmalloc(de_len, GFP_KERNEL); 1331 if (!tmpde) { 1332 ret = -ENOMEM; 1333 goto fail; 1334 } 1335 memcpy(tmpde, bh->b_data + offset, frag1); 1336 brelse(bh); 1337 bh = sb_bread(inode->i_sb, ++block); 1338 if (!bh) 1339 goto out_badread; 1340 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1341 de = tmpde; 1342 } 1343 1344 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1345 ei->i_iget5_offset, 1346 ISOFS_BUFFER_BITS(inode)); 1347 1348 /* Assume it is a normal-format file unless told otherwise */ 1349 ei->i_file_format = isofs_file_normal; 1350 1351 if (de->flags[-high_sierra] & 2) { 1352 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1353 inode->i_mode = S_IFDIR | sbi->s_dmode; 1354 else 1355 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1356 set_nlink(inode, 1); /* 1357 * Set to 1. We know there are 2, but 1358 * the find utility tries to optimize 1359 * if it is 2, and it screws up. It is 1360 * easier to give 1 which tells find to 1361 * do it the hard way. 1362 */ 1363 } else { 1364 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1365 inode->i_mode = S_IFREG | sbi->s_fmode; 1366 } else { 1367 /* 1368 * Set default permissions: r-x for all. The disc 1369 * could be shared with DOS machines so virtually 1370 * anything could be a valid executable. 1371 */ 1372 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1373 } 1374 set_nlink(inode, 1); 1375 } 1376 inode->i_uid = sbi->s_uid; 1377 inode->i_gid = sbi->s_gid; 1378 inode->i_blocks = 0; 1379 1380 ei->i_format_parm[0] = 0; 1381 ei->i_format_parm[1] = 0; 1382 ei->i_format_parm[2] = 0; 1383 1384 ei->i_section_size = isonum_733(de->size); 1385 if (de->flags[-high_sierra] & 0x80) { 1386 ret = isofs_read_level3_size(inode); 1387 if (ret < 0) 1388 goto fail; 1389 ret = -EIO; 1390 } else { 1391 ei->i_next_section_block = 0; 1392 ei->i_next_section_offset = 0; 1393 inode->i_size = isonum_733(de->size); 1394 } 1395 1396 /* 1397 * Some dipshit decided to store some other bit of information 1398 * in the high byte of the file length. Truncate size in case 1399 * this CDROM was mounted with the cruft option. 1400 */ 1401 1402 if (sbi->s_cruft) 1403 inode->i_size &= 0x00ffffff; 1404 1405 if (de->interleave[0]) { 1406 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1407 inode->i_size = 0; 1408 } 1409 1410 /* I have no idea what file_unit_size is used for, so 1411 we will flag it for now */ 1412 if (de->file_unit_size[0] != 0) { 1413 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1414 inode->i_ino); 1415 } 1416 1417 /* I have no idea what other flag bits are used for, so 1418 we will flag it for now */ 1419#ifdef DEBUG 1420 if((de->flags[-high_sierra] & ~2)!= 0){ 1421 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1422 "(%ld %x).\n", 1423 inode->i_ino, de->flags[-high_sierra]); 1424 } 1425#endif 1426 1427 inode->i_mtime.tv_sec = 1428 inode->i_atime.tv_sec = 1429 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1430 inode->i_mtime.tv_nsec = 1431 inode->i_atime.tv_nsec = 1432 inode->i_ctime.tv_nsec = 0; 1433 1434 ei->i_first_extent = (isonum_733(de->extent) + 1435 isonum_711(de->ext_attr_length)); 1436 1437 /* Set the number of blocks for stat() - should be done before RR */ 1438 inode->i_blocks = (inode->i_size + 511) >> 9; 1439 1440 /* 1441 * Now test for possible Rock Ridge extensions which will override 1442 * some of these numbers in the inode structure. 1443 */ 1444 1445 if (!high_sierra) { 1446 parse_rock_ridge_inode(de, inode, relocated); 1447 /* if we want uid/gid set, override the rock ridge setting */ 1448 if (sbi->s_uid_set) 1449 inode->i_uid = sbi->s_uid; 1450 if (sbi->s_gid_set) 1451 inode->i_gid = sbi->s_gid; 1452 } 1453 /* Now set final access rights if overriding rock ridge setting */ 1454 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1455 sbi->s_dmode != ISOFS_INVALID_MODE) 1456 inode->i_mode = S_IFDIR | sbi->s_dmode; 1457 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1458 sbi->s_fmode != ISOFS_INVALID_MODE) 1459 inode->i_mode = S_IFREG | sbi->s_fmode; 1460 1461 /* Install the inode operations vector */ 1462 if (S_ISREG(inode->i_mode)) { 1463 inode->i_fop = &generic_ro_fops; 1464 switch (ei->i_file_format) { 1465#ifdef CONFIG_ZISOFS 1466 case isofs_file_compressed: 1467 inode->i_data.a_ops = &zisofs_aops; 1468 break; 1469#endif 1470 default: 1471 inode->i_data.a_ops = &isofs_aops; 1472 break; 1473 } 1474 } else if (S_ISDIR(inode->i_mode)) { 1475 inode->i_op = &isofs_dir_inode_operations; 1476 inode->i_fop = &isofs_dir_operations; 1477 } else if (S_ISLNK(inode->i_mode)) { 1478 inode->i_op = &page_symlink_inode_operations; 1479 inode_nohighmem(inode); 1480 inode->i_data.a_ops = &isofs_symlink_aops; 1481 } else 1482 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1483 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1484 1485 ret = 0; 1486out: 1487 kfree(tmpde); 1488 if (bh) 1489 brelse(bh); 1490 return ret; 1491 1492out_badread: 1493 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1494fail: 1495 goto out; 1496} 1497 1498struct isofs_iget5_callback_data { 1499 unsigned long block; 1500 unsigned long offset; 1501}; 1502 1503static int isofs_iget5_test(struct inode *ino, void *data) 1504{ 1505 struct iso_inode_info *i = ISOFS_I(ino); 1506 struct isofs_iget5_callback_data *d = 1507 (struct isofs_iget5_callback_data*)data; 1508 return (i->i_iget5_block == d->block) 1509 && (i->i_iget5_offset == d->offset); 1510} 1511 1512static int isofs_iget5_set(struct inode *ino, void *data) 1513{ 1514 struct iso_inode_info *i = ISOFS_I(ino); 1515 struct isofs_iget5_callback_data *d = 1516 (struct isofs_iget5_callback_data*)data; 1517 i->i_iget5_block = d->block; 1518 i->i_iget5_offset = d->offset; 1519 return 0; 1520} 1521 1522/* Store, in the inode's containing structure, the block and block 1523 * offset that point to the underlying meta-data for the inode. The 1524 * code below is otherwise similar to the iget() code in 1525 * include/linux/fs.h */ 1526struct inode *__isofs_iget(struct super_block *sb, 1527 unsigned long block, 1528 unsigned long offset, 1529 int relocated) 1530{ 1531 unsigned long hashval; 1532 struct inode *inode; 1533 struct isofs_iget5_callback_data data; 1534 long ret; 1535 1536 if (offset >= 1ul << sb->s_blocksize_bits) 1537 return ERR_PTR(-EINVAL); 1538 1539 data.block = block; 1540 data.offset = offset; 1541 1542 hashval = (block << sb->s_blocksize_bits) | offset; 1543 1544 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1545 &isofs_iget5_set, &data); 1546 1547 if (!inode) 1548 return ERR_PTR(-ENOMEM); 1549 1550 if (inode->i_state & I_NEW) { 1551 ret = isofs_read_inode(inode, relocated); 1552 if (ret < 0) { 1553 iget_failed(inode); 1554 inode = ERR_PTR(ret); 1555 } else { 1556 unlock_new_inode(inode); 1557 } 1558 } 1559 1560 return inode; 1561} 1562 1563static struct dentry *isofs_mount(struct file_system_type *fs_type, 1564 int flags, const char *dev_name, void *data) 1565{ 1566 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1567} 1568 1569static struct file_system_type iso9660_fs_type = { 1570 .owner = THIS_MODULE, 1571 .name = "iso9660", 1572 .mount = isofs_mount, 1573 .kill_sb = kill_block_super, 1574 .fs_flags = FS_REQUIRES_DEV, 1575}; 1576MODULE_ALIAS_FS("iso9660"); 1577MODULE_ALIAS("iso9660"); 1578 1579static int __init init_iso9660_fs(void) 1580{ 1581 int err = init_inodecache(); 1582 if (err) 1583 goto out; 1584#ifdef CONFIG_ZISOFS 1585 err = zisofs_init(); 1586 if (err) 1587 goto out1; 1588#endif 1589 err = register_filesystem(&iso9660_fs_type); 1590 if (err) 1591 goto out2; 1592 return 0; 1593out2: 1594#ifdef CONFIG_ZISOFS 1595 zisofs_cleanup(); 1596out1: 1597#endif 1598 destroy_inodecache(); 1599out: 1600 return err; 1601} 1602 1603static void __exit exit_iso9660_fs(void) 1604{ 1605 unregister_filesystem(&iso9660_fs_type); 1606#ifdef CONFIG_ZISOFS 1607 zisofs_cleanup(); 1608#endif 1609 destroy_inodecache(); 1610} 1611 1612module_init(init_iso9660_fs) 1613module_exit(exit_iso9660_fs) 1614MODULE_LICENSE("GPL"); 1615