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 M��nkeberg - 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 = alloc_inode_sb(sb, 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_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 unsigned int uv; 342 343 popt->map = 'n'; 344 popt->rock = 1; 345 popt->joliet = 1; 346 popt->cruft = 0; 347 popt->hide = 0; 348 popt->showassoc = 0; 349 popt->check = 'u'; /* unset */ 350 popt->nocompress = 0; 351 popt->blocksize = 1024; 352 popt->fmode = popt->dmode = ISOFS_INVALID_MODE; 353 popt->uid_set = 0; 354 popt->gid_set = 0; 355 popt->gid = GLOBAL_ROOT_GID; 356 popt->uid = GLOBAL_ROOT_UID; 357 popt->iocharset = NULL; 358 popt->overriderockperm = 0; 359 popt->session=-1; 360 popt->sbsector=-1; 361 if (!options) 362 return 1; 363 364 while ((p = strsep(&options, ",")) != NULL) { 365 int token; 366 substring_t args[MAX_OPT_ARGS]; 367 unsigned n; 368 369 if (!*p) 370 continue; 371 372 token = match_token(p, tokens, args); 373 switch (token) { 374 case Opt_norock: 375 popt->rock = 0; 376 break; 377 case Opt_nojoliet: 378 popt->joliet = 0; 379 break; 380 case Opt_hide: 381 popt->hide = 1; 382 break; 383 case Opt_unhide: 384 case Opt_showassoc: 385 popt->showassoc = 1; 386 break; 387 case Opt_cruft: 388 popt->cruft = 1; 389 break; 390#ifdef CONFIG_JOLIET 391 case Opt_utf8: 392 kfree(popt->iocharset); 393 popt->iocharset = kstrdup("utf8", GFP_KERNEL); 394 if (!popt->iocharset) 395 return 0; 396 break; 397 case Opt_iocharset: 398 kfree(popt->iocharset); 399 popt->iocharset = match_strdup(&args[0]); 400 if (!popt->iocharset) 401 return 0; 402 break; 403#endif 404 case Opt_map_a: 405 popt->map = 'a'; 406 break; 407 case Opt_map_o: 408 popt->map = 'o'; 409 break; 410 case Opt_map_n: 411 popt->map = 'n'; 412 break; 413 case Opt_session: 414 if (match_int(&args[0], &option)) 415 return 0; 416 n = option; 417 /* 418 * Track numbers are supposed to be in range 1-99, the 419 * mount option starts indexing at 0. 420 */ 421 if (n >= 99) 422 return 0; 423 popt->session = n + 1; 424 break; 425 case Opt_sb: 426 if (match_int(&args[0], &option)) 427 return 0; 428 popt->sbsector = option; 429 break; 430 case Opt_check_r: 431 popt->check = 'r'; 432 break; 433 case Opt_check_s: 434 popt->check = 's'; 435 break; 436 case Opt_ignore: 437 break; 438 case Opt_uid: 439 if (match_uint(&args[0], &uv)) 440 return 0; 441 popt->uid = make_kuid(current_user_ns(), uv); 442 if (!uid_valid(popt->uid)) 443 return 0; 444 popt->uid_set = 1; 445 break; 446 case Opt_gid: 447 if (match_uint(&args[0], &uv)) 448 return 0; 449 popt->gid = make_kgid(current_user_ns(), uv); 450 if (!gid_valid(popt->gid)) 451 return 0; 452 popt->gid_set = 1; 453 break; 454 case Opt_mode: 455 if (match_int(&args[0], &option)) 456 return 0; 457 popt->fmode = option; 458 break; 459 case Opt_dmode: 460 if (match_int(&args[0], &option)) 461 return 0; 462 popt->dmode = option; 463 break; 464 case Opt_overriderockperm: 465 popt->overriderockperm = 1; 466 break; 467 case Opt_block: 468 if (match_int(&args[0], &option)) 469 return 0; 470 n = option; 471 if (n != 512 && n != 1024 && n != 2048) 472 return 0; 473 popt->blocksize = n; 474 break; 475 case Opt_nocompress: 476 popt->nocompress = 1; 477 break; 478 default: 479 return 0; 480 } 481 } 482 return 1; 483} 484 485/* 486 * Display the mount options in /proc/mounts. 487 */ 488static int isofs_show_options(struct seq_file *m, struct dentry *root) 489{ 490 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 491 492 if (!sbi->s_rock) seq_puts(m, ",norock"); 493 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 494 if (sbi->s_cruft) seq_puts(m, ",cruft"); 495 if (sbi->s_hide) seq_puts(m, ",hide"); 496 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 497 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 498 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 499 500 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 501 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 502 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 503 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 504 505 if (root->d_sb->s_blocksize != 1024) 506 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 507 508 if (sbi->s_uid_set) 509 seq_printf(m, ",uid=%u", 510 from_kuid_munged(&init_user_ns, sbi->s_uid)); 511 if (sbi->s_gid_set) 512 seq_printf(m, ",gid=%u", 513 from_kgid_munged(&init_user_ns, sbi->s_gid)); 514 515 if (sbi->s_dmode != ISOFS_INVALID_MODE) 516 seq_printf(m, ",dmode=%o", sbi->s_dmode); 517 if (sbi->s_fmode != ISOFS_INVALID_MODE) 518 seq_printf(m, ",fmode=%o", sbi->s_fmode); 519 520#ifdef CONFIG_JOLIET 521 if (sbi->s_nls_iocharset) 522 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 523 else 524 seq_puts(m, ",iocharset=utf8"); 525#endif 526 return 0; 527} 528 529/* 530 * look if the driver can tell the multi session redirection value 531 * 532 * don't change this if you don't know what you do, please! 533 * Multisession is legal only with XA disks. 534 * A non-XA disk with more than one volume descriptor may do it right, but 535 * usually is written in a nowhere standardized "multi-partition" manner. 536 * Multisession uses absolute addressing (solely the first frame of the whole 537 * track is #0), multi-partition uses relative addressing (each first frame of 538 * each track is #0), and a track is not a session. 539 * 540 * A broken CDwriter software or drive firmware does not set new standards, 541 * at least not if conflicting with the existing ones. 542 * 543 * emoenke@gwdg.de 544 */ 545#define WE_OBEY_THE_WRITTEN_STANDARDS 1 546 547static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 548{ 549 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); 550 unsigned int vol_desc_start = 0; 551 552 if (session > 0) { 553 struct cdrom_tocentry te; 554 555 if (!cdi) 556 return 0; 557 558 te.cdte_track = session; 559 te.cdte_format = CDROM_LBA; 560 if (cdrom_read_tocentry(cdi, &te) == 0) { 561 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 562 session, te.cdte_addr.lba, 563 te.cdte_ctrl & CDROM_DATA_TRACK); 564 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4) 565 return te.cdte_addr.lba; 566 } 567 568 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 569 } 570 571 if (cdi) { 572 struct cdrom_multisession ms_info; 573 574 ms_info.addr_format = CDROM_LBA; 575 if (cdrom_multisession(cdi, &ms_info) == 0) { 576#if WE_OBEY_THE_WRITTEN_STANDARDS 577 /* necessary for a valid ms_info.addr */ 578 if (ms_info.xa_flag) 579#endif 580 vol_desc_start = ms_info.addr.lba; 581 } 582 } 583 584 return vol_desc_start; 585} 586 587/* 588 * Check if root directory is empty (has less than 3 files). 589 * 590 * Used to detect broken CDs where ISO root directory is empty but Joliet root 591 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 592 * (and Joliet used instead) or else no files would be visible. 593 */ 594static bool rootdir_empty(struct super_block *sb, unsigned long block) 595{ 596 int offset = 0, files = 0, de_len; 597 struct iso_directory_record *de; 598 struct buffer_head *bh; 599 600 bh = sb_bread(sb, block); 601 if (!bh) 602 return true; 603 while (files < 3) { 604 de = (struct iso_directory_record *) (bh->b_data + offset); 605 de_len = *(unsigned char *) de; 606 if (de_len == 0) 607 break; 608 files++; 609 offset += de_len; 610 } 611 brelse(bh); 612 return files < 3; 613} 614 615/* 616 * Initialize the superblock and read the root inode. 617 */ 618static int isofs_fill_super(struct super_block *s, void *data, int silent) 619{ 620 struct buffer_head *bh = NULL, *pri_bh = NULL; 621 struct hs_primary_descriptor *h_pri = NULL; 622 struct iso_primary_descriptor *pri = NULL; 623 struct iso_supplementary_descriptor *sec = NULL; 624 struct iso_directory_record *rootp; 625 struct inode *inode; 626 struct iso9660_options opt; 627 struct isofs_sb_info *sbi; 628 unsigned long first_data_zone; 629 int joliet_level = 0; 630 int iso_blknum, block; 631 int orig_zonesize; 632 int table, error = -EINVAL; 633 unsigned int vol_desc_start; 634 635 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 636 if (!sbi) 637 return -ENOMEM; 638 s->s_fs_info = sbi; 639 640 if (!parse_options((char *)data, &opt)) 641 goto out_freesbi; 642 643 /* 644 * First of all, get the hardware blocksize for this device. 645 * If we don't know what it is, or the hardware blocksize is 646 * larger than the blocksize the user specified, then use 647 * that value. 648 */ 649 /* 650 * What if bugger tells us to go beyond page size? 651 */ 652 if (bdev_logical_block_size(s->s_bdev) > 2048) { 653 printk(KERN_WARNING 654 "ISOFS: unsupported/invalid hardware sector size %d\n", 655 bdev_logical_block_size(s->s_bdev)); 656 goto out_freesbi; 657 } 658 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 659 660 sbi->s_high_sierra = 0; /* default is iso9660 */ 661 sbi->s_session = opt.session; 662 sbi->s_sbsector = opt.sbsector; 663 664 vol_desc_start = (opt.sbsector != -1) ? 665 opt.sbsector : isofs_get_last_session(s,opt.session); 666 667 for (iso_blknum = vol_desc_start+16; 668 iso_blknum < vol_desc_start+100; iso_blknum++) { 669 struct hs_volume_descriptor *hdp; 670 struct iso_volume_descriptor *vdp; 671 672 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 673 if (!(bh = sb_bread(s, block))) 674 goto out_no_read; 675 676 vdp = (struct iso_volume_descriptor *)bh->b_data; 677 hdp = (struct hs_volume_descriptor *)bh->b_data; 678 679 /* 680 * Due to the overlapping physical location of the descriptors, 681 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 682 * proper identification in this case, we first check for ISO. 683 */ 684 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 685 if (isonum_711(vdp->type) == ISO_VD_END) 686 break; 687 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 688 if (!pri) { 689 pri = (struct iso_primary_descriptor *)vdp; 690 /* Save the buffer in case we need it ... */ 691 pri_bh = bh; 692 bh = NULL; 693 } 694 } 695#ifdef CONFIG_JOLIET 696 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 697 sec = (struct iso_supplementary_descriptor *)vdp; 698 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 699 if (opt.joliet) { 700 if (sec->escape[2] == 0x40) 701 joliet_level = 1; 702 else if (sec->escape[2] == 0x43) 703 joliet_level = 2; 704 else if (sec->escape[2] == 0x45) 705 joliet_level = 3; 706 707 printk(KERN_DEBUG "ISO 9660 Extensions: " 708 "Microsoft Joliet Level %d\n", 709 joliet_level); 710 } 711 goto root_found; 712 } else { 713 /* Unknown supplementary volume descriptor */ 714 sec = NULL; 715 } 716 } 717#endif 718 } else { 719 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 720 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 721 goto out_freebh; 722 723 sbi->s_high_sierra = 1; 724 opt.rock = 0; 725 h_pri = (struct hs_primary_descriptor *)vdp; 726 goto root_found; 727 } 728 } 729 730 /* Just skip any volume descriptors we don't recognize */ 731 732 brelse(bh); 733 bh = NULL; 734 } 735 /* 736 * If we fall through, either no volume descriptor was found, 737 * or else we passed a primary descriptor looking for others. 738 */ 739 if (!pri) 740 goto out_unknown_format; 741 brelse(bh); 742 bh = pri_bh; 743 pri_bh = NULL; 744 745root_found: 746 /* We don't support read-write mounts */ 747 if (!sb_rdonly(s)) { 748 error = -EACCES; 749 goto out_freebh; 750 } 751 752 if (joliet_level && (!pri || !opt.rock)) { 753 /* This is the case of Joliet with the norock mount flag. 754 * A disc with both Joliet and Rock Ridge is handled later 755 */ 756 pri = (struct iso_primary_descriptor *) sec; 757 } 758 759 if(sbi->s_high_sierra){ 760 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 761 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 762 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 763 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 764 } else { 765 if (!pri) 766 goto out_freebh; 767 rootp = (struct iso_directory_record *) pri->root_directory_record; 768 sbi->s_nzones = isonum_733(pri->volume_space_size); 769 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 770 sbi->s_max_size = isonum_733(pri->volume_space_size); 771 } 772 773 sbi->s_ninodes = 0; /* No way to figure this out easily */ 774 775 orig_zonesize = sbi->s_log_zone_size; 776 /* 777 * If the zone size is smaller than the hardware sector size, 778 * this is a fatal error. This would occur if the disc drive 779 * had sectors that were 2048 bytes, but the filesystem had 780 * blocks that were 512 bytes (which should only very rarely 781 * happen.) 782 */ 783 if (orig_zonesize < opt.blocksize) 784 goto out_bad_size; 785 786 /* RDE: convert log zone size to bit shift */ 787 switch (sbi->s_log_zone_size) { 788 case 512: sbi->s_log_zone_size = 9; break; 789 case 1024: sbi->s_log_zone_size = 10; break; 790 case 2048: sbi->s_log_zone_size = 11; break; 791 792 default: 793 goto out_bad_zone_size; 794 } 795 796 s->s_magic = ISOFS_SUPER_MAGIC; 797 798 /* 799 * With multi-extent files, file size is only limited by the maximum 800 * size of a file system, which is 8 TB. 801 */ 802 s->s_maxbytes = 0x80000000000LL; 803 804 /* ECMA-119 timestamp from 1900/1/1 with tz offset */ 805 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET; 806 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET; 807 808 /* Set this for reference. Its not currently used except on write 809 which we don't have .. */ 810 811 first_data_zone = isonum_733(rootp->extent) + 812 isonum_711(rootp->ext_attr_length); 813 sbi->s_firstdatazone = first_data_zone; 814#ifndef BEQUIET 815 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 816 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 817 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 818 if(sbi->s_high_sierra) 819 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 820#endif 821 822 /* 823 * If the Joliet level is set, we _may_ decide to use the 824 * secondary descriptor, but can't be sure until after we 825 * read the root inode. But before reading the root inode 826 * we may need to change the device blocksize, and would 827 * rather release the old buffer first. So, we cache the 828 * first_data_zone value from the secondary descriptor. 829 */ 830 if (joliet_level) { 831 pri = (struct iso_primary_descriptor *) sec; 832 rootp = (struct iso_directory_record *) 833 pri->root_directory_record; 834 first_data_zone = isonum_733(rootp->extent) + 835 isonum_711(rootp->ext_attr_length); 836 } 837 838 /* 839 * We're all done using the volume descriptor, and may need 840 * to change the device blocksize, so release the buffer now. 841 */ 842 brelse(pri_bh); 843 brelse(bh); 844 845 /* 846 * Force the blocksize to 512 for 512 byte sectors. The file 847 * read primitives really get it wrong in a bad way if we don't 848 * do this. 849 * 850 * Note - we should never be setting the blocksize to something 851 * less than the hardware sector size for the device. If we 852 * do, we would end up having to read larger buffers and split 853 * out portions to satisfy requests. 854 * 855 * Note2- the idea here is that we want to deal with the optimal 856 * zonesize in the filesystem. If we have it set to something less, 857 * then we have horrible problems with trying to piece together 858 * bits of adjacent blocks in order to properly read directory 859 * entries. By forcing the blocksize in this way, we ensure 860 * that we will never be required to do this. 861 */ 862 sb_set_blocksize(s, orig_zonesize); 863 864 sbi->s_nls_iocharset = NULL; 865 866#ifdef CONFIG_JOLIET 867 if (joliet_level) { 868 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 869 if (strcmp(p, "utf8") != 0) { 870 sbi->s_nls_iocharset = opt.iocharset ? 871 load_nls(opt.iocharset) : load_nls_default(); 872 if (!sbi->s_nls_iocharset) 873 goto out_freesbi; 874 } 875 } 876#endif 877 s->s_op = &isofs_sops; 878 s->s_export_op = &isofs_export_ops; 879 sbi->s_mapping = opt.map; 880 sbi->s_rock = (opt.rock ? 2 : 0); 881 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 882 sbi->s_cruft = opt.cruft; 883 sbi->s_hide = opt.hide; 884 sbi->s_showassoc = opt.showassoc; 885 sbi->s_uid = opt.uid; 886 sbi->s_gid = opt.gid; 887 sbi->s_uid_set = opt.uid_set; 888 sbi->s_gid_set = opt.gid_set; 889 sbi->s_nocompress = opt.nocompress; 890 sbi->s_overriderockperm = opt.overriderockperm; 891 /* 892 * It would be incredibly stupid to allow people to mark every file 893 * on the disk as suid, so we merely allow them to set the default 894 * permissions. 895 */ 896 if (opt.fmode != ISOFS_INVALID_MODE) 897 sbi->s_fmode = opt.fmode & 0777; 898 else 899 sbi->s_fmode = ISOFS_INVALID_MODE; 900 if (opt.dmode != ISOFS_INVALID_MODE) 901 sbi->s_dmode = opt.dmode & 0777; 902 else 903 sbi->s_dmode = ISOFS_INVALID_MODE; 904 905 /* 906 * Read the root inode, which _may_ result in changing 907 * the s_rock flag. Once we have the final s_rock value, 908 * we then decide whether to use the Joliet descriptor. 909 */ 910 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 911 912 /* 913 * Fix for broken CDs with a corrupt root inode but a correct Joliet 914 * root directory. 915 */ 916 if (IS_ERR(inode)) { 917 if (joliet_level && sbi->s_firstdatazone != first_data_zone) { 918 printk(KERN_NOTICE 919 "ISOFS: root inode is unusable. " 920 "Disabling Rock Ridge and switching to Joliet."); 921 sbi->s_rock = 0; 922 inode = NULL; 923 } else { 924 goto out_no_root; 925 } 926 } 927 928 /* 929 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 930 * correct Joliet root directory. 931 */ 932 if (sbi->s_rock == 1 && joliet_level && 933 rootdir_empty(s, sbi->s_firstdatazone)) { 934 printk(KERN_NOTICE 935 "ISOFS: primary root directory is empty. " 936 "Disabling Rock Ridge and switching to Joliet."); 937 sbi->s_rock = 0; 938 } 939 940 /* 941 * If this disk has both Rock Ridge and Joliet on it, then we 942 * want to use Rock Ridge by default. This can be overridden 943 * by using the norock mount option. There is still one other 944 * possibility that is not taken into account: a Rock Ridge 945 * CD with Unicode names. Until someone sees such a beast, it 946 * will not be supported. 947 */ 948 if (sbi->s_rock == 1) { 949 joliet_level = 0; 950 } else if (joliet_level) { 951 sbi->s_rock = 0; 952 if (sbi->s_firstdatazone != first_data_zone) { 953 sbi->s_firstdatazone = first_data_zone; 954 printk(KERN_DEBUG 955 "ISOFS: changing to secondary root\n"); 956 iput(inode); 957 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 958 if (IS_ERR(inode)) 959 goto out_no_root; 960 } 961 } 962 963 if (opt.check == 'u') { 964 /* Only Joliet is case insensitive by default */ 965 if (joliet_level) 966 opt.check = 'r'; 967 else 968 opt.check = 's'; 969 } 970 sbi->s_joliet_level = joliet_level; 971 972 /* Make sure the root inode is a directory */ 973 if (!S_ISDIR(inode->i_mode)) { 974 printk(KERN_WARNING 975 "isofs_fill_super: root inode is not a directory. " 976 "Corrupted media?\n"); 977 goto out_iput; 978 } 979 980 table = 0; 981 if (joliet_level) 982 table += 2; 983 if (opt.check == 'r') 984 table++; 985 sbi->s_check = opt.check; 986 987 if (table) 988 s->s_d_op = &isofs_dentry_ops[table - 1]; 989 990 /* get the root dentry */ 991 s->s_root = d_make_root(inode); 992 if (!(s->s_root)) { 993 error = -ENOMEM; 994 goto out_no_inode; 995 } 996 997 kfree(opt.iocharset); 998 999 return 0; 1000 1001 /* 1002 * Display error messages and free resources. 1003 */ 1004out_iput: 1005 iput(inode); 1006 goto out_no_inode; 1007out_no_root: 1008 error = PTR_ERR(inode); 1009 if (error != -ENOMEM) 1010 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 1011out_no_inode: 1012#ifdef CONFIG_JOLIET 1013 unload_nls(sbi->s_nls_iocharset); 1014#endif 1015 goto out_freesbi; 1016out_no_read: 1017 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 1018 __func__, s->s_id, iso_blknum, block); 1019 goto out_freebh; 1020out_bad_zone_size: 1021 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 1022 sbi->s_log_zone_size); 1023 goto out_freebh; 1024out_bad_size: 1025 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 1026 orig_zonesize, opt.blocksize); 1027 goto out_freebh; 1028out_unknown_format: 1029 if (!silent) 1030 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1031 1032out_freebh: 1033 brelse(bh); 1034 brelse(pri_bh); 1035out_freesbi: 1036 kfree(opt.iocharset); 1037 kfree(sbi); 1038 s->s_fs_info = NULL; 1039 return error; 1040} 1041 1042static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1043{ 1044 struct super_block *sb = dentry->d_sb; 1045 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1046 1047 buf->f_type = ISOFS_SUPER_MAGIC; 1048 buf->f_bsize = sb->s_blocksize; 1049 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1050 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1051 buf->f_bfree = 0; 1052 buf->f_bavail = 0; 1053 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1054 buf->f_ffree = 0; 1055 buf->f_fsid = u64_to_fsid(id); 1056 buf->f_namelen = NAME_MAX; 1057 return 0; 1058} 1059 1060/* 1061 * Get a set of blocks; filling in buffer_heads if already allocated 1062 * or getblk() if they are not. Returns the number of blocks inserted 1063 * (-ve == error.) 1064 */ 1065int isofs_get_blocks(struct inode *inode, sector_t iblock, 1066 struct buffer_head **bh, unsigned long nblocks) 1067{ 1068 unsigned long b_off = iblock; 1069 unsigned offset, sect_size; 1070 unsigned int firstext; 1071 unsigned long nextblk, nextoff; 1072 int section, rv, error; 1073 struct iso_inode_info *ei = ISOFS_I(inode); 1074 1075 error = -EIO; 1076 rv = 0; 1077 if (iblock != b_off) { 1078 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1079 goto abort; 1080 } 1081 1082 1083 offset = 0; 1084 firstext = ei->i_first_extent; 1085 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1086 nextblk = ei->i_next_section_block; 1087 nextoff = ei->i_next_section_offset; 1088 section = 0; 1089 1090 while (nblocks) { 1091 /* If we are *way* beyond the end of the file, print a message. 1092 * Access beyond the end of the file up to the next page boundary 1093 * is normal, however because of the way the page cache works. 1094 * In this case, we just return 0 so that we can properly fill 1095 * the page with useless information without generating any 1096 * I/O errors. 1097 */ 1098 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1099 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1100 __func__, b_off, 1101 (unsigned long long)inode->i_size); 1102 goto abort; 1103 } 1104 1105 /* On the last section, nextblk == 0, section size is likely to 1106 * exceed sect_size by a partial block, and access beyond the 1107 * end of the file will reach beyond the section size, too. 1108 */ 1109 while (nextblk && (b_off >= (offset + sect_size))) { 1110 struct inode *ninode; 1111 1112 offset += sect_size; 1113 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1114 if (IS_ERR(ninode)) { 1115 error = PTR_ERR(ninode); 1116 goto abort; 1117 } 1118 firstext = ISOFS_I(ninode)->i_first_extent; 1119 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1120 nextblk = ISOFS_I(ninode)->i_next_section_block; 1121 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1122 iput(ninode); 1123 1124 if (++section > 100) { 1125 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1126 " aborting...\n", __func__); 1127 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1128 "nextblk=%lu nextoff=%lu\n", __func__, 1129 b_off, firstext, (unsigned) sect_size, 1130 nextblk, nextoff); 1131 goto abort; 1132 } 1133 } 1134 1135 if (*bh) { 1136 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1137 } else { 1138 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1139 if (!*bh) 1140 goto abort; 1141 } 1142 bh++; /* Next buffer head */ 1143 b_off++; /* Next buffer offset */ 1144 nblocks--; 1145 rv++; 1146 } 1147 1148 error = 0; 1149abort: 1150 return rv != 0 ? rv : error; 1151} 1152 1153/* 1154 * Used by the standard interfaces. 1155 */ 1156static int isofs_get_block(struct inode *inode, sector_t iblock, 1157 struct buffer_head *bh_result, int create) 1158{ 1159 int ret; 1160 1161 if (create) { 1162 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1163 return -EROFS; 1164 } 1165 1166 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1167 return ret < 0 ? ret : 0; 1168} 1169 1170static int isofs_bmap(struct inode *inode, sector_t block) 1171{ 1172 struct buffer_head dummy; 1173 int error; 1174 1175 dummy.b_state = 0; 1176 dummy.b_blocknr = -1000; 1177 error = isofs_get_block(inode, block, &dummy, 0); 1178 if (!error) 1179 return dummy.b_blocknr; 1180 return 0; 1181} 1182 1183struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1184{ 1185 sector_t blknr = isofs_bmap(inode, block); 1186 if (!blknr) 1187 return NULL; 1188 return sb_bread(inode->i_sb, blknr); 1189} 1190 1191static int isofs_read_folio(struct file *file, struct folio *folio) 1192{ 1193 return mpage_read_folio(folio, isofs_get_block); 1194} 1195 1196static void isofs_readahead(struct readahead_control *rac) 1197{ 1198 mpage_readahead(rac, isofs_get_block); 1199} 1200 1201static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1202{ 1203 return generic_block_bmap(mapping,block,isofs_get_block); 1204} 1205 1206static const struct address_space_operations isofs_aops = { 1207 .read_folio = isofs_read_folio, 1208 .readahead = isofs_readahead, 1209 .bmap = _isofs_bmap 1210}; 1211 1212static int isofs_read_level3_size(struct inode *inode) 1213{ 1214 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1215 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1216 struct buffer_head *bh = NULL; 1217 unsigned long block, offset, block_saved, offset_saved; 1218 int i = 0; 1219 int more_entries = 0; 1220 struct iso_directory_record *tmpde = NULL; 1221 struct iso_inode_info *ei = ISOFS_I(inode); 1222 1223 inode->i_size = 0; 1224 1225 /* The first 16 blocks are reserved as the System Area. Thus, 1226 * no inodes can appear in block 0. We use this to flag that 1227 * this is the last section. */ 1228 ei->i_next_section_block = 0; 1229 ei->i_next_section_offset = 0; 1230 1231 block = ei->i_iget5_block; 1232 offset = ei->i_iget5_offset; 1233 1234 do { 1235 struct iso_directory_record *de; 1236 unsigned int de_len; 1237 1238 if (!bh) { 1239 bh = sb_bread(inode->i_sb, block); 1240 if (!bh) 1241 goto out_noread; 1242 } 1243 de = (struct iso_directory_record *) (bh->b_data + offset); 1244 de_len = *(unsigned char *) de; 1245 1246 if (de_len == 0) { 1247 brelse(bh); 1248 bh = NULL; 1249 ++block; 1250 offset = 0; 1251 continue; 1252 } 1253 1254 block_saved = block; 1255 offset_saved = offset; 1256 offset += de_len; 1257 1258 /* Make sure we have a full directory entry */ 1259 if (offset >= bufsize) { 1260 int slop = bufsize - offset + de_len; 1261 if (!tmpde) { 1262 tmpde = kmalloc(256, GFP_KERNEL); 1263 if (!tmpde) 1264 goto out_nomem; 1265 } 1266 memcpy(tmpde, de, slop); 1267 offset &= bufsize - 1; 1268 block++; 1269 brelse(bh); 1270 bh = NULL; 1271 if (offset) { 1272 bh = sb_bread(inode->i_sb, block); 1273 if (!bh) 1274 goto out_noread; 1275 memcpy((void *)tmpde+slop, bh->b_data, offset); 1276 } 1277 de = tmpde; 1278 } 1279 1280 inode->i_size += isonum_733(de->size); 1281 if (i == 1) { 1282 ei->i_next_section_block = block_saved; 1283 ei->i_next_section_offset = offset_saved; 1284 } 1285 1286 more_entries = de->flags[-high_sierra] & 0x80; 1287 1288 i++; 1289 if (i > 100) 1290 goto out_toomany; 1291 } while (more_entries); 1292out: 1293 kfree(tmpde); 1294 brelse(bh); 1295 return 0; 1296 1297out_nomem: 1298 brelse(bh); 1299 return -ENOMEM; 1300 1301out_noread: 1302 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1303 kfree(tmpde); 1304 return -EIO; 1305 1306out_toomany: 1307 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1308 "isofs_read_level3_size: inode=%lu\n", 1309 __func__, inode->i_ino); 1310 goto out; 1311} 1312 1313static int isofs_read_inode(struct inode *inode, int relocated) 1314{ 1315 struct super_block *sb = inode->i_sb; 1316 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1317 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1318 unsigned long block; 1319 int high_sierra = sbi->s_high_sierra; 1320 struct buffer_head *bh; 1321 struct iso_directory_record *de; 1322 struct iso_directory_record *tmpde = NULL; 1323 unsigned int de_len; 1324 unsigned long offset; 1325 struct iso_inode_info *ei = ISOFS_I(inode); 1326 int ret = -EIO; 1327 1328 block = ei->i_iget5_block; 1329 bh = sb_bread(inode->i_sb, block); 1330 if (!bh) 1331 goto out_badread; 1332 1333 offset = ei->i_iget5_offset; 1334 1335 de = (struct iso_directory_record *) (bh->b_data + offset); 1336 de_len = *(unsigned char *) de; 1337 if (de_len < sizeof(struct iso_directory_record)) 1338 goto fail; 1339 1340 if (offset + de_len > bufsize) { 1341 int frag1 = bufsize - offset; 1342 1343 tmpde = kmalloc(de_len, GFP_KERNEL); 1344 if (!tmpde) { 1345 ret = -ENOMEM; 1346 goto fail; 1347 } 1348 memcpy(tmpde, bh->b_data + offset, frag1); 1349 brelse(bh); 1350 bh = sb_bread(inode->i_sb, ++block); 1351 if (!bh) 1352 goto out_badread; 1353 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1354 de = tmpde; 1355 } 1356 1357 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1358 ei->i_iget5_offset, 1359 ISOFS_BUFFER_BITS(inode)); 1360 1361 /* Assume it is a normal-format file unless told otherwise */ 1362 ei->i_file_format = isofs_file_normal; 1363 1364 if (de->flags[-high_sierra] & 2) { 1365 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1366 inode->i_mode = S_IFDIR | sbi->s_dmode; 1367 else 1368 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1369 set_nlink(inode, 1); /* 1370 * Set to 1. We know there are 2, but 1371 * the find utility tries to optimize 1372 * if it is 2, and it screws up. It is 1373 * easier to give 1 which tells find to 1374 * do it the hard way. 1375 */ 1376 } else { 1377 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1378 inode->i_mode = S_IFREG | sbi->s_fmode; 1379 } else { 1380 /* 1381 * Set default permissions: r-x for all. The disc 1382 * could be shared with DOS machines so virtually 1383 * anything could be a valid executable. 1384 */ 1385 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1386 } 1387 set_nlink(inode, 1); 1388 } 1389 inode->i_uid = sbi->s_uid; 1390 inode->i_gid = sbi->s_gid; 1391 inode->i_blocks = 0; 1392 1393 ei->i_format_parm[0] = 0; 1394 ei->i_format_parm[1] = 0; 1395 ei->i_format_parm[2] = 0; 1396 1397 ei->i_section_size = isonum_733(de->size); 1398 if (de->flags[-high_sierra] & 0x80) { 1399 ret = isofs_read_level3_size(inode); 1400 if (ret < 0) 1401 goto fail; 1402 ret = -EIO; 1403 } else { 1404 ei->i_next_section_block = 0; 1405 ei->i_next_section_offset = 0; 1406 inode->i_size = isonum_733(de->size); 1407 } 1408 1409 /* 1410 * Some dipshit decided to store some other bit of information 1411 * in the high byte of the file length. Truncate size in case 1412 * this CDROM was mounted with the cruft option. 1413 */ 1414 1415 if (sbi->s_cruft) 1416 inode->i_size &= 0x00ffffff; 1417 1418 if (de->interleave[0]) { 1419 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1420 inode->i_size = 0; 1421 } 1422 1423 /* I have no idea what file_unit_size is used for, so 1424 we will flag it for now */ 1425 if (de->file_unit_size[0] != 0) { 1426 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1427 inode->i_ino); 1428 } 1429 1430 /* I have no idea what other flag bits are used for, so 1431 we will flag it for now */ 1432#ifdef DEBUG 1433 if((de->flags[-high_sierra] & ~2)!= 0){ 1434 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1435 "(%ld %x).\n", 1436 inode->i_ino, de->flags[-high_sierra]); 1437 } 1438#endif 1439 inode_set_mtime_to_ts(inode, 1440 inode_set_atime_to_ts(inode, inode_set_ctime(inode, iso_date(de->date, high_sierra), 0))); 1441 1442 ei->i_first_extent = (isonum_733(de->extent) + 1443 isonum_711(de->ext_attr_length)); 1444 1445 /* Set the number of blocks for stat() - should be done before RR */ 1446 inode->i_blocks = (inode->i_size + 511) >> 9; 1447 1448 /* 1449 * Now test for possible Rock Ridge extensions which will override 1450 * some of these numbers in the inode structure. 1451 */ 1452 1453 if (!high_sierra) { 1454 parse_rock_ridge_inode(de, inode, relocated); 1455 /* if we want uid/gid set, override the rock ridge setting */ 1456 if (sbi->s_uid_set) 1457 inode->i_uid = sbi->s_uid; 1458 if (sbi->s_gid_set) 1459 inode->i_gid = sbi->s_gid; 1460 } 1461 /* Now set final access rights if overriding rock ridge setting */ 1462 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1463 sbi->s_dmode != ISOFS_INVALID_MODE) 1464 inode->i_mode = S_IFDIR | sbi->s_dmode; 1465 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1466 sbi->s_fmode != ISOFS_INVALID_MODE) 1467 inode->i_mode = S_IFREG | sbi->s_fmode; 1468 1469 /* Install the inode operations vector */ 1470 if (S_ISREG(inode->i_mode)) { 1471 inode->i_fop = &generic_ro_fops; 1472 switch (ei->i_file_format) { 1473#ifdef CONFIG_ZISOFS 1474 case isofs_file_compressed: 1475 inode->i_data.a_ops = &zisofs_aops; 1476 break; 1477#endif 1478 default: 1479 inode->i_data.a_ops = &isofs_aops; 1480 break; 1481 } 1482 } else if (S_ISDIR(inode->i_mode)) { 1483 inode->i_op = &isofs_dir_inode_operations; 1484 inode->i_fop = &isofs_dir_operations; 1485 } else if (S_ISLNK(inode->i_mode)) { 1486 inode->i_op = &page_symlink_inode_operations; 1487 inode_nohighmem(inode); 1488 inode->i_data.a_ops = &isofs_symlink_aops; 1489 } else 1490 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1491 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1492 1493 ret = 0; 1494out: 1495 kfree(tmpde); 1496 brelse(bh); 1497 return ret; 1498 1499out_badread: 1500 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1501fail: 1502 goto out; 1503} 1504 1505struct isofs_iget5_callback_data { 1506 unsigned long block; 1507 unsigned long offset; 1508}; 1509 1510static int isofs_iget5_test(struct inode *ino, void *data) 1511{ 1512 struct iso_inode_info *i = ISOFS_I(ino); 1513 struct isofs_iget5_callback_data *d = 1514 (struct isofs_iget5_callback_data*)data; 1515 return (i->i_iget5_block == d->block) 1516 && (i->i_iget5_offset == d->offset); 1517} 1518 1519static int isofs_iget5_set(struct inode *ino, void *data) 1520{ 1521 struct iso_inode_info *i = ISOFS_I(ino); 1522 struct isofs_iget5_callback_data *d = 1523 (struct isofs_iget5_callback_data*)data; 1524 i->i_iget5_block = d->block; 1525 i->i_iget5_offset = d->offset; 1526 return 0; 1527} 1528 1529/* Store, in the inode's containing structure, the block and block 1530 * offset that point to the underlying meta-data for the inode. The 1531 * code below is otherwise similar to the iget() code in 1532 * include/linux/fs.h */ 1533struct inode *__isofs_iget(struct super_block *sb, 1534 unsigned long block, 1535 unsigned long offset, 1536 int relocated) 1537{ 1538 unsigned long hashval; 1539 struct inode *inode; 1540 struct isofs_iget5_callback_data data; 1541 long ret; 1542 1543 if (offset >= 1ul << sb->s_blocksize_bits) 1544 return ERR_PTR(-EINVAL); 1545 1546 data.block = block; 1547 data.offset = offset; 1548 1549 hashval = (block << sb->s_blocksize_bits) | offset; 1550 1551 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1552 &isofs_iget5_set, &data); 1553 1554 if (!inode) 1555 return ERR_PTR(-ENOMEM); 1556 1557 if (inode->i_state & I_NEW) { 1558 ret = isofs_read_inode(inode, relocated); 1559 if (ret < 0) { 1560 iget_failed(inode); 1561 inode = ERR_PTR(ret); 1562 } else { 1563 unlock_new_inode(inode); 1564 } 1565 } 1566 1567 return inode; 1568} 1569 1570static struct dentry *isofs_mount(struct file_system_type *fs_type, 1571 int flags, const char *dev_name, void *data) 1572{ 1573 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1574} 1575 1576static struct file_system_type iso9660_fs_type = { 1577 .owner = THIS_MODULE, 1578 .name = "iso9660", 1579 .mount = isofs_mount, 1580 .kill_sb = kill_block_super, 1581 .fs_flags = FS_REQUIRES_DEV, 1582}; 1583MODULE_ALIAS_FS("iso9660"); 1584MODULE_ALIAS("iso9660"); 1585 1586static int __init init_iso9660_fs(void) 1587{ 1588 int err = init_inodecache(); 1589 if (err) 1590 goto out; 1591#ifdef CONFIG_ZISOFS 1592 err = zisofs_init(); 1593 if (err) 1594 goto out1; 1595#endif 1596 err = register_filesystem(&iso9660_fs_type); 1597 if (err) 1598 goto out2; 1599 return 0; 1600out2: 1601#ifdef CONFIG_ZISOFS 1602 zisofs_cleanup(); 1603out1: 1604#endif 1605 destroy_inodecache(); 1606out: 1607 return err; 1608} 1609 1610static void __exit exit_iso9660_fs(void) 1611{ 1612 unregister_filesystem(&iso9660_fs_type); 1613#ifdef CONFIG_ZISOFS 1614 zisofs_cleanup(); 1615#endif 1616 destroy_inodecache(); 1617} 1618 1619module_init(init_iso9660_fs) 1620module_exit(exit_iso9660_fs) 1621MODULE_LICENSE("GPL"); 1622