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 #define BEQUIET 34 35 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); 36 static int isofs_dentry_cmpi(const struct dentry *dentry, 37 unsigned int len, const char *str, const struct qstr *name); 38 39 #ifdef CONFIG_JOLIET 40 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); 41 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); 42 static int isofs_dentry_cmpi_ms(const struct dentry *dentry, 43 unsigned int len, const char *str, const struct qstr *name); 44 static int isofs_dentry_cmp_ms(const struct dentry *dentry, 45 unsigned int len, const char *str, const struct qstr *name); 46 #endif 47 48 static void isofs_put_super(struct super_block *sb) 49 { 50 struct isofs_sb_info *sbi = ISOFS_SB(sb); 51 52 #ifdef CONFIG_JOLIET 53 unload_nls(sbi->s_nls_iocharset); 54 #endif 55 56 kfree(sbi); 57 sb->s_fs_info = NULL; 58 return; 59 } 60 61 static int isofs_read_inode(struct inode *, int relocated); 62 static int isofs_statfs (struct dentry *, struct kstatfs *); 63 static int isofs_show_options(struct seq_file *, struct dentry *); 64 65 static struct kmem_cache *isofs_inode_cachep; 66 67 static struct inode *isofs_alloc_inode(struct super_block *sb) 68 { 69 struct iso_inode_info *ei; 70 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); 71 if (!ei) 72 return NULL; 73 return &ei->vfs_inode; 74 } 75 76 static void isofs_free_inode(struct inode *inode) 77 { 78 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 79 } 80 81 static void init_once(void *foo) 82 { 83 struct iso_inode_info *ei = foo; 84 85 inode_init_once(&ei->vfs_inode); 86 } 87 88 static int __init init_inodecache(void) 89 { 90 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", 91 sizeof(struct iso_inode_info), 92 0, (SLAB_RECLAIM_ACCOUNT| 93 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 94 init_once); 95 if (!isofs_inode_cachep) 96 return -ENOMEM; 97 return 0; 98 } 99 100 static void destroy_inodecache(void) 101 { 102 /* 103 * Make sure all delayed rcu free inodes are flushed before we 104 * destroy cache. 105 */ 106 rcu_barrier(); 107 kmem_cache_destroy(isofs_inode_cachep); 108 } 109 110 static int isofs_remount(struct super_block *sb, int *flags, char *data) 111 { 112 sync_filesystem(sb); 113 if (!(*flags & SB_RDONLY)) 114 return -EROFS; 115 return 0; 116 } 117 118 static const struct super_operations isofs_sops = { 119 .alloc_inode = isofs_alloc_inode, 120 .free_inode = isofs_free_inode, 121 .put_super = isofs_put_super, 122 .statfs = isofs_statfs, 123 .remount_fs = isofs_remount, 124 .show_options = isofs_show_options, 125 }; 126 127 128 static const struct dentry_operations isofs_dentry_ops[] = { 129 { 130 .d_hash = isofs_hashi, 131 .d_compare = isofs_dentry_cmpi, 132 }, 133 #ifdef CONFIG_JOLIET 134 { 135 .d_hash = isofs_hash_ms, 136 .d_compare = isofs_dentry_cmp_ms, 137 }, 138 { 139 .d_hash = isofs_hashi_ms, 140 .d_compare = isofs_dentry_cmpi_ms, 141 }, 142 #endif 143 }; 144 145 struct iso9660_options{ 146 unsigned int rock:1; 147 unsigned int joliet:1; 148 unsigned int cruft:1; 149 unsigned int hide:1; 150 unsigned int showassoc:1; 151 unsigned int nocompress:1; 152 unsigned int overriderockperm:1; 153 unsigned int uid_set:1; 154 unsigned int gid_set:1; 155 unsigned int utf8:1; 156 unsigned char map; 157 unsigned char check; 158 unsigned int blocksize; 159 umode_t fmode; 160 umode_t dmode; 161 kgid_t gid; 162 kuid_t uid; 163 char *iocharset; 164 /* LVE */ 165 s32 session; 166 s32 sbsector; 167 }; 168 169 /* 170 * Compute the hash for the isofs name corresponding to the dentry. 171 */ 172 static int 173 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) 174 { 175 const char *name; 176 int len; 177 char c; 178 unsigned long hash; 179 180 len = qstr->len; 181 name = qstr->name; 182 if (ms) { 183 while (len && name[len-1] == '.') 184 len--; 185 } 186 187 hash = init_name_hash(dentry); 188 while (len--) { 189 c = tolower(*name++); 190 hash = partial_name_hash(c, hash); 191 } 192 qstr->hash = end_name_hash(hash); 193 194 return 0; 195 } 196 197 /* 198 * Compare of two isofs names. 199 */ 200 static int isofs_dentry_cmp_common( 201 unsigned int len, const char *str, 202 const struct qstr *name, int ms, int ci) 203 { 204 int alen, blen; 205 206 /* A filename cannot end in '.' or we treat it like it has none */ 207 alen = name->len; 208 blen = len; 209 if (ms) { 210 while (alen && name->name[alen-1] == '.') 211 alen--; 212 while (blen && str[blen-1] == '.') 213 blen--; 214 } 215 if (alen == blen) { 216 if (ci) { 217 if (strncasecmp(name->name, str, alen) == 0) 218 return 0; 219 } else { 220 if (strncmp(name->name, str, alen) == 0) 221 return 0; 222 } 223 } 224 return 1; 225 } 226 227 static int 228 isofs_hashi(const struct dentry *dentry, struct qstr *qstr) 229 { 230 return isofs_hashi_common(dentry, qstr, 0); 231 } 232 233 static int 234 isofs_dentry_cmpi(const struct dentry *dentry, 235 unsigned int len, const char *str, const struct qstr *name) 236 { 237 return isofs_dentry_cmp_common(len, str, name, 0, 1); 238 } 239 240 #ifdef CONFIG_JOLIET 241 /* 242 * Compute the hash for the isofs name corresponding to the dentry. 243 */ 244 static int 245 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) 246 { 247 const char *name; 248 int len; 249 250 len = qstr->len; 251 name = qstr->name; 252 if (ms) { 253 while (len && name[len-1] == '.') 254 len--; 255 } 256 257 qstr->hash = full_name_hash(dentry, name, len); 258 259 return 0; 260 } 261 262 static int 263 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) 264 { 265 return isofs_hash_common(dentry, qstr, 1); 266 } 267 268 static int 269 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) 270 { 271 return isofs_hashi_common(dentry, qstr, 1); 272 } 273 274 static int 275 isofs_dentry_cmp_ms(const struct dentry *dentry, 276 unsigned int len, const char *str, const struct qstr *name) 277 { 278 return isofs_dentry_cmp_common(len, str, name, 1, 0); 279 } 280 281 static int 282 isofs_dentry_cmpi_ms(const struct dentry *dentry, 283 unsigned int len, const char *str, const struct qstr *name) 284 { 285 return isofs_dentry_cmp_common(len, str, name, 1, 1); 286 } 287 #endif 288 289 enum { 290 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, 291 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, 292 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, 293 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, 294 }; 295 296 static const match_table_t tokens = { 297 {Opt_norock, "norock"}, 298 {Opt_nojoliet, "nojoliet"}, 299 {Opt_unhide, "unhide"}, 300 {Opt_hide, "hide"}, 301 {Opt_showassoc, "showassoc"}, 302 {Opt_cruft, "cruft"}, 303 {Opt_utf8, "utf8"}, 304 {Opt_iocharset, "iocharset=%s"}, 305 {Opt_map_a, "map=acorn"}, 306 {Opt_map_a, "map=a"}, 307 {Opt_map_n, "map=normal"}, 308 {Opt_map_n, "map=n"}, 309 {Opt_map_o, "map=off"}, 310 {Opt_map_o, "map=o"}, 311 {Opt_session, "session=%u"}, 312 {Opt_sb, "sbsector=%u"}, 313 {Opt_check_r, "check=relaxed"}, 314 {Opt_check_r, "check=r"}, 315 {Opt_check_s, "check=strict"}, 316 {Opt_check_s, "check=s"}, 317 {Opt_uid, "uid=%u"}, 318 {Opt_gid, "gid=%u"}, 319 {Opt_mode, "mode=%u"}, 320 {Opt_dmode, "dmode=%u"}, 321 {Opt_overriderockperm, "overriderockperm"}, 322 {Opt_block, "block=%u"}, 323 {Opt_ignore, "conv=binary"}, 324 {Opt_ignore, "conv=b"}, 325 {Opt_ignore, "conv=text"}, 326 {Opt_ignore, "conv=t"}, 327 {Opt_ignore, "conv=mtext"}, 328 {Opt_ignore, "conv=m"}, 329 {Opt_ignore, "conv=auto"}, 330 {Opt_ignore, "conv=a"}, 331 {Opt_nocompress, "nocompress"}, 332 {Opt_err, NULL} 333 }; 334 335 static int parse_options(char *options, struct iso9660_options *popt) 336 { 337 char *p; 338 int option; 339 340 popt->map = 'n'; 341 popt->rock = 1; 342 popt->joliet = 1; 343 popt->cruft = 0; 344 popt->hide = 0; 345 popt->showassoc = 0; 346 popt->check = 'u'; /* unset */ 347 popt->nocompress = 0; 348 popt->blocksize = 1024; 349 popt->fmode = popt->dmode = ISOFS_INVALID_MODE; 350 popt->uid_set = 0; 351 popt->gid_set = 0; 352 popt->gid = GLOBAL_ROOT_GID; 353 popt->uid = GLOBAL_ROOT_UID; 354 popt->iocharset = NULL; 355 popt->utf8 = 0; 356 popt->overriderockperm = 0; 357 popt->session=-1; 358 popt->sbsector=-1; 359 if (!options) 360 return 1; 361 362 while ((p = strsep(&options, ",")) != NULL) { 363 int token; 364 substring_t args[MAX_OPT_ARGS]; 365 unsigned n; 366 367 if (!*p) 368 continue; 369 370 token = match_token(p, tokens, args); 371 switch (token) { 372 case Opt_norock: 373 popt->rock = 0; 374 break; 375 case Opt_nojoliet: 376 popt->joliet = 0; 377 break; 378 case Opt_hide: 379 popt->hide = 1; 380 break; 381 case Opt_unhide: 382 case Opt_showassoc: 383 popt->showassoc = 1; 384 break; 385 case Opt_cruft: 386 popt->cruft = 1; 387 break; 388 case Opt_utf8: 389 popt->utf8 = 1; 390 break; 391 #ifdef CONFIG_JOLIET 392 case Opt_iocharset: 393 kfree(popt->iocharset); 394 popt->iocharset = match_strdup(&args[0]); 395 if (!popt->iocharset) 396 return 0; 397 break; 398 #endif 399 case Opt_map_a: 400 popt->map = 'a'; 401 break; 402 case Opt_map_o: 403 popt->map = 'o'; 404 break; 405 case Opt_map_n: 406 popt->map = 'n'; 407 break; 408 case Opt_session: 409 if (match_int(&args[0], &option)) 410 return 0; 411 n = option; 412 /* 413 * Track numbers are supposed to be in range 1-99, the 414 * mount option starts indexing at 0. 415 */ 416 if (n >= 99) 417 return 0; 418 popt->session = n + 1; 419 break; 420 case Opt_sb: 421 if (match_int(&args[0], &option)) 422 return 0; 423 popt->sbsector = option; 424 break; 425 case Opt_check_r: 426 popt->check = 'r'; 427 break; 428 case Opt_check_s: 429 popt->check = 's'; 430 break; 431 case Opt_ignore: 432 break; 433 case Opt_uid: 434 if (match_int(&args[0], &option)) 435 return 0; 436 popt->uid = make_kuid(current_user_ns(), option); 437 if (!uid_valid(popt->uid)) 438 return 0; 439 popt->uid_set = 1; 440 break; 441 case Opt_gid: 442 if (match_int(&args[0], &option)) 443 return 0; 444 popt->gid = make_kgid(current_user_ns(), option); 445 if (!gid_valid(popt->gid)) 446 return 0; 447 popt->gid_set = 1; 448 break; 449 case Opt_mode: 450 if (match_int(&args[0], &option)) 451 return 0; 452 popt->fmode = option; 453 break; 454 case Opt_dmode: 455 if (match_int(&args[0], &option)) 456 return 0; 457 popt->dmode = option; 458 break; 459 case Opt_overriderockperm: 460 popt->overriderockperm = 1; 461 break; 462 case Opt_block: 463 if (match_int(&args[0], &option)) 464 return 0; 465 n = option; 466 if (n != 512 && n != 1024 && n != 2048) 467 return 0; 468 popt->blocksize = n; 469 break; 470 case Opt_nocompress: 471 popt->nocompress = 1; 472 break; 473 default: 474 return 0; 475 } 476 } 477 return 1; 478 } 479 480 /* 481 * Display the mount options in /proc/mounts. 482 */ 483 static int isofs_show_options(struct seq_file *m, struct dentry *root) 484 { 485 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 486 487 if (!sbi->s_rock) seq_puts(m, ",norock"); 488 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 489 if (sbi->s_cruft) seq_puts(m, ",cruft"); 490 if (sbi->s_hide) seq_puts(m, ",hide"); 491 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 492 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 493 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 494 if (sbi->s_utf8) seq_puts(m, ",utf8"); 495 496 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 497 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 498 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 499 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 500 501 if (root->d_sb->s_blocksize != 1024) 502 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 503 504 if (sbi->s_uid_set) 505 seq_printf(m, ",uid=%u", 506 from_kuid_munged(&init_user_ns, sbi->s_uid)); 507 if (sbi->s_gid_set) 508 seq_printf(m, ",gid=%u", 509 from_kgid_munged(&init_user_ns, sbi->s_gid)); 510 511 if (sbi->s_dmode != ISOFS_INVALID_MODE) 512 seq_printf(m, ",dmode=%o", sbi->s_dmode); 513 if (sbi->s_fmode != ISOFS_INVALID_MODE) 514 seq_printf(m, ",fmode=%o", sbi->s_fmode); 515 516 #ifdef CONFIG_JOLIET 517 if (sbi->s_nls_iocharset && 518 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) 519 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 520 #endif 521 return 0; 522 } 523 524 /* 525 * look if the driver can tell the multi session redirection value 526 * 527 * don't change this if you don't know what you do, please! 528 * Multisession is legal only with XA disks. 529 * A non-XA disk with more than one volume descriptor may do it right, but 530 * usually is written in a nowhere standardized "multi-partition" manner. 531 * Multisession uses absolute addressing (solely the first frame of the whole 532 * track is #0), multi-partition uses relative addressing (each first frame of 533 * each track is #0), and a track is not a session. 534 * 535 * A broken CDwriter software or drive firmware does not set new standards, 536 * at least not if conflicting with the existing ones. 537 * 538 * emoenke@gwdg.de 539 */ 540 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 541 542 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 543 { 544 struct cdrom_multisession ms_info; 545 unsigned int vol_desc_start; 546 struct block_device *bdev = sb->s_bdev; 547 int i; 548 549 vol_desc_start=0; 550 ms_info.addr_format=CDROM_LBA; 551 if (session > 0) { 552 struct cdrom_tocentry Te; 553 Te.cdte_track=session; 554 Te.cdte_format=CDROM_LBA; 555 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); 556 if (!i) { 557 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 558 session, Te.cdte_addr.lba, 559 Te.cdte_ctrl&CDROM_DATA_TRACK); 560 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) 561 return Te.cdte_addr.lba; 562 } 563 564 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 565 } 566 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); 567 if (session > 0) 568 printk(KERN_ERR "ISOFS: Invalid session number\n"); 569 #if 0 570 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); 571 if (i==0) { 572 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); 573 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); 574 } 575 #endif 576 if (i==0) 577 #if WE_OBEY_THE_WRITTEN_STANDARDS 578 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ 579 #endif 580 vol_desc_start=ms_info.addr.lba; 581 return vol_desc_start; 582 } 583 584 /* 585 * Check if root directory is empty (has less than 3 files). 586 * 587 * Used to detect broken CDs where ISO root directory is empty but Joliet root 588 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 589 * (and Joliet used instead) or else no files would be visible. 590 */ 591 static bool rootdir_empty(struct super_block *sb, unsigned long block) 592 { 593 int offset = 0, files = 0, de_len; 594 struct iso_directory_record *de; 595 struct buffer_head *bh; 596 597 bh = sb_bread(sb, block); 598 if (!bh) 599 return true; 600 while (files < 3) { 601 de = (struct iso_directory_record *) (bh->b_data + offset); 602 de_len = *(unsigned char *) de; 603 if (de_len == 0) 604 break; 605 files++; 606 offset += de_len; 607 } 608 brelse(bh); 609 return files < 3; 610 } 611 612 /* 613 * Initialize the superblock and read the root inode. 614 * 615 * Note: a check_disk_change() has been done immediately prior 616 * to this call, so we don't need to check again. 617 */ 618 static 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; 744 745 root_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 /* Set this for reference. Its not currently used except on write 805 which we don't have .. */ 806 807 first_data_zone = isonum_733(rootp->extent) + 808 isonum_711(rootp->ext_attr_length); 809 sbi->s_firstdatazone = first_data_zone; 810 #ifndef BEQUIET 811 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 812 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 813 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 814 if(sbi->s_high_sierra) 815 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 816 #endif 817 818 /* 819 * If the Joliet level is set, we _may_ decide to use the 820 * secondary descriptor, but can't be sure until after we 821 * read the root inode. But before reading the root inode 822 * we may need to change the device blocksize, and would 823 * rather release the old buffer first. So, we cache the 824 * first_data_zone value from the secondary descriptor. 825 */ 826 if (joliet_level) { 827 pri = (struct iso_primary_descriptor *) sec; 828 rootp = (struct iso_directory_record *) 829 pri->root_directory_record; 830 first_data_zone = isonum_733(rootp->extent) + 831 isonum_711(rootp->ext_attr_length); 832 } 833 834 /* 835 * We're all done using the volume descriptor, and may need 836 * to change the device blocksize, so release the buffer now. 837 */ 838 brelse(pri_bh); 839 brelse(bh); 840 841 /* 842 * Force the blocksize to 512 for 512 byte sectors. The file 843 * read primitives really get it wrong in a bad way if we don't 844 * do this. 845 * 846 * Note - we should never be setting the blocksize to something 847 * less than the hardware sector size for the device. If we 848 * do, we would end up having to read larger buffers and split 849 * out portions to satisfy requests. 850 * 851 * Note2- the idea here is that we want to deal with the optimal 852 * zonesize in the filesystem. If we have it set to something less, 853 * then we have horrible problems with trying to piece together 854 * bits of adjacent blocks in order to properly read directory 855 * entries. By forcing the blocksize in this way, we ensure 856 * that we will never be required to do this. 857 */ 858 sb_set_blocksize(s, orig_zonesize); 859 860 sbi->s_nls_iocharset = NULL; 861 862 #ifdef CONFIG_JOLIET 863 if (joliet_level && opt.utf8 == 0) { 864 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 865 sbi->s_nls_iocharset = load_nls(p); 866 if (! sbi->s_nls_iocharset) { 867 /* Fail only if explicit charset specified */ 868 if (opt.iocharset) 869 goto out_freesbi; 870 sbi->s_nls_iocharset = load_nls_default(); 871 } 872 } 873 #endif 874 s->s_op = &isofs_sops; 875 s->s_export_op = &isofs_export_ops; 876 sbi->s_mapping = opt.map; 877 sbi->s_rock = (opt.rock ? 2 : 0); 878 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 879 sbi->s_cruft = opt.cruft; 880 sbi->s_hide = opt.hide; 881 sbi->s_showassoc = opt.showassoc; 882 sbi->s_uid = opt.uid; 883 sbi->s_gid = opt.gid; 884 sbi->s_uid_set = opt.uid_set; 885 sbi->s_gid_set = opt.gid_set; 886 sbi->s_utf8 = opt.utf8; 887 sbi->s_nocompress = opt.nocompress; 888 sbi->s_overriderockperm = opt.overriderockperm; 889 /* 890 * It would be incredibly stupid to allow people to mark every file 891 * on the disk as suid, so we merely allow them to set the default 892 * permissions. 893 */ 894 if (opt.fmode != ISOFS_INVALID_MODE) 895 sbi->s_fmode = opt.fmode & 0777; 896 else 897 sbi->s_fmode = ISOFS_INVALID_MODE; 898 if (opt.dmode != ISOFS_INVALID_MODE) 899 sbi->s_dmode = opt.dmode & 0777; 900 else 901 sbi->s_dmode = ISOFS_INVALID_MODE; 902 903 /* 904 * Read the root inode, which _may_ result in changing 905 * the s_rock flag. Once we have the final s_rock value, 906 * we then decide whether to use the Joliet descriptor. 907 */ 908 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 909 if (IS_ERR(inode)) 910 goto out_no_root; 911 912 /* 913 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 914 * correct Joliet root directory. 915 */ 916 if (sbi->s_rock == 1 && joliet_level && 917 rootdir_empty(s, sbi->s_firstdatazone)) { 918 printk(KERN_NOTICE 919 "ISOFS: primary root directory is empty. " 920 "Disabling Rock Ridge and switching to Joliet."); 921 sbi->s_rock = 0; 922 } 923 924 /* 925 * If this disk has both Rock Ridge and Joliet on it, then we 926 * want to use Rock Ridge by default. This can be overridden 927 * by using the norock mount option. There is still one other 928 * possibility that is not taken into account: a Rock Ridge 929 * CD with Unicode names. Until someone sees such a beast, it 930 * will not be supported. 931 */ 932 if (sbi->s_rock == 1) { 933 joliet_level = 0; 934 } else if (joliet_level) { 935 sbi->s_rock = 0; 936 if (sbi->s_firstdatazone != first_data_zone) { 937 sbi->s_firstdatazone = first_data_zone; 938 printk(KERN_DEBUG 939 "ISOFS: changing to secondary root\n"); 940 iput(inode); 941 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 942 if (IS_ERR(inode)) 943 goto out_no_root; 944 } 945 } 946 947 if (opt.check == 'u') { 948 /* Only Joliet is case insensitive by default */ 949 if (joliet_level) 950 opt.check = 'r'; 951 else 952 opt.check = 's'; 953 } 954 sbi->s_joliet_level = joliet_level; 955 956 /* Make sure the root inode is a directory */ 957 if (!S_ISDIR(inode->i_mode)) { 958 printk(KERN_WARNING 959 "isofs_fill_super: root inode is not a directory. " 960 "Corrupted media?\n"); 961 goto out_iput; 962 } 963 964 table = 0; 965 if (joliet_level) 966 table += 2; 967 if (opt.check == 'r') 968 table++; 969 sbi->s_check = opt.check; 970 971 if (table) 972 s->s_d_op = &isofs_dentry_ops[table - 1]; 973 974 /* get the root dentry */ 975 s->s_root = d_make_root(inode); 976 if (!(s->s_root)) { 977 error = -ENOMEM; 978 goto out_no_inode; 979 } 980 981 kfree(opt.iocharset); 982 983 return 0; 984 985 /* 986 * Display error messages and free resources. 987 */ 988 out_iput: 989 iput(inode); 990 goto out_no_inode; 991 out_no_root: 992 error = PTR_ERR(inode); 993 if (error != -ENOMEM) 994 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 995 out_no_inode: 996 #ifdef CONFIG_JOLIET 997 unload_nls(sbi->s_nls_iocharset); 998 #endif 999 goto out_freesbi; 1000 out_no_read: 1001 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 1002 __func__, s->s_id, iso_blknum, block); 1003 goto out_freebh; 1004 out_bad_zone_size: 1005 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 1006 sbi->s_log_zone_size); 1007 goto out_freebh; 1008 out_bad_size: 1009 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 1010 orig_zonesize, opt.blocksize); 1011 goto out_freebh; 1012 out_unknown_format: 1013 if (!silent) 1014 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1015 1016 out_freebh: 1017 brelse(bh); 1018 brelse(pri_bh); 1019 out_freesbi: 1020 kfree(opt.iocharset); 1021 kfree(sbi); 1022 s->s_fs_info = NULL; 1023 return error; 1024 } 1025 1026 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1027 { 1028 struct super_block *sb = dentry->d_sb; 1029 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1030 1031 buf->f_type = ISOFS_SUPER_MAGIC; 1032 buf->f_bsize = sb->s_blocksize; 1033 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1034 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1035 buf->f_bfree = 0; 1036 buf->f_bavail = 0; 1037 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1038 buf->f_ffree = 0; 1039 buf->f_fsid.val[0] = (u32)id; 1040 buf->f_fsid.val[1] = (u32)(id >> 32); 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 */ 1050 int 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; 1134 abort: 1135 return rv != 0 ? rv : error; 1136 } 1137 1138 /* 1139 * Used by the standard interfaces. 1140 */ 1141 static 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 1155 static 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 1168 struct 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 1176 static int isofs_readpage(struct file *file, struct page *page) 1177 { 1178 return mpage_readpage(page, isofs_get_block); 1179 } 1180 1181 static int isofs_readpages(struct file *file, struct address_space *mapping, 1182 struct list_head *pages, unsigned nr_pages) 1183 { 1184 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); 1185 } 1186 1187 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1188 { 1189 return generic_block_bmap(mapping,block,isofs_get_block); 1190 } 1191 1192 static const struct address_space_operations isofs_aops = { 1193 .readpage = isofs_readpage, 1194 .readpages = isofs_readpages, 1195 .bmap = _isofs_bmap 1196 }; 1197 1198 static int isofs_read_level3_size(struct inode *inode) 1199 { 1200 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1201 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1202 struct buffer_head *bh = NULL; 1203 unsigned long block, offset, block_saved, offset_saved; 1204 int i = 0; 1205 int more_entries = 0; 1206 struct iso_directory_record *tmpde = NULL; 1207 struct iso_inode_info *ei = ISOFS_I(inode); 1208 1209 inode->i_size = 0; 1210 1211 /* The first 16 blocks are reserved as the System Area. Thus, 1212 * no inodes can appear in block 0. We use this to flag that 1213 * this is the last section. */ 1214 ei->i_next_section_block = 0; 1215 ei->i_next_section_offset = 0; 1216 1217 block = ei->i_iget5_block; 1218 offset = ei->i_iget5_offset; 1219 1220 do { 1221 struct iso_directory_record *de; 1222 unsigned int de_len; 1223 1224 if (!bh) { 1225 bh = sb_bread(inode->i_sb, block); 1226 if (!bh) 1227 goto out_noread; 1228 } 1229 de = (struct iso_directory_record *) (bh->b_data + offset); 1230 de_len = *(unsigned char *) de; 1231 1232 if (de_len == 0) { 1233 brelse(bh); 1234 bh = NULL; 1235 ++block; 1236 offset = 0; 1237 continue; 1238 } 1239 1240 block_saved = block; 1241 offset_saved = offset; 1242 offset += de_len; 1243 1244 /* Make sure we have a full directory entry */ 1245 if (offset >= bufsize) { 1246 int slop = bufsize - offset + de_len; 1247 if (!tmpde) { 1248 tmpde = kmalloc(256, GFP_KERNEL); 1249 if (!tmpde) 1250 goto out_nomem; 1251 } 1252 memcpy(tmpde, de, slop); 1253 offset &= bufsize - 1; 1254 block++; 1255 brelse(bh); 1256 bh = NULL; 1257 if (offset) { 1258 bh = sb_bread(inode->i_sb, block); 1259 if (!bh) 1260 goto out_noread; 1261 memcpy((void *)tmpde+slop, bh->b_data, offset); 1262 } 1263 de = tmpde; 1264 } 1265 1266 inode->i_size += isonum_733(de->size); 1267 if (i == 1) { 1268 ei->i_next_section_block = block_saved; 1269 ei->i_next_section_offset = offset_saved; 1270 } 1271 1272 more_entries = de->flags[-high_sierra] & 0x80; 1273 1274 i++; 1275 if (i > 100) 1276 goto out_toomany; 1277 } while (more_entries); 1278 out: 1279 kfree(tmpde); 1280 if (bh) 1281 brelse(bh); 1282 return 0; 1283 1284 out_nomem: 1285 if (bh) 1286 brelse(bh); 1287 return -ENOMEM; 1288 1289 out_noread: 1290 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1291 kfree(tmpde); 1292 return -EIO; 1293 1294 out_toomany: 1295 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1296 "isofs_read_level3_size: inode=%lu\n", 1297 __func__, inode->i_ino); 1298 goto out; 1299 } 1300 1301 static int isofs_read_inode(struct inode *inode, int relocated) 1302 { 1303 struct super_block *sb = inode->i_sb; 1304 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1305 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1306 unsigned long block; 1307 int high_sierra = sbi->s_high_sierra; 1308 struct buffer_head *bh; 1309 struct iso_directory_record *de; 1310 struct iso_directory_record *tmpde = NULL; 1311 unsigned int de_len; 1312 unsigned long offset; 1313 struct iso_inode_info *ei = ISOFS_I(inode); 1314 int ret = -EIO; 1315 1316 block = ei->i_iget5_block; 1317 bh = sb_bread(inode->i_sb, block); 1318 if (!bh) 1319 goto out_badread; 1320 1321 offset = ei->i_iget5_offset; 1322 1323 de = (struct iso_directory_record *) (bh->b_data + offset); 1324 de_len = *(unsigned char *) de; 1325 1326 if (offset + de_len > bufsize) { 1327 int frag1 = bufsize - offset; 1328 1329 tmpde = kmalloc(de_len, GFP_KERNEL); 1330 if (!tmpde) { 1331 ret = -ENOMEM; 1332 goto fail; 1333 } 1334 memcpy(tmpde, bh->b_data + offset, frag1); 1335 brelse(bh); 1336 bh = sb_bread(inode->i_sb, ++block); 1337 if (!bh) 1338 goto out_badread; 1339 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1340 de = tmpde; 1341 } 1342 1343 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1344 ei->i_iget5_offset, 1345 ISOFS_BUFFER_BITS(inode)); 1346 1347 /* Assume it is a normal-format file unless told otherwise */ 1348 ei->i_file_format = isofs_file_normal; 1349 1350 if (de->flags[-high_sierra] & 2) { 1351 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1352 inode->i_mode = S_IFDIR | sbi->s_dmode; 1353 else 1354 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1355 set_nlink(inode, 1); /* 1356 * Set to 1. We know there are 2, but 1357 * the find utility tries to optimize 1358 * if it is 2, and it screws up. It is 1359 * easier to give 1 which tells find to 1360 * do it the hard way. 1361 */ 1362 } else { 1363 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1364 inode->i_mode = S_IFREG | sbi->s_fmode; 1365 } else { 1366 /* 1367 * Set default permissions: r-x for all. The disc 1368 * could be shared with DOS machines so virtually 1369 * anything could be a valid executable. 1370 */ 1371 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1372 } 1373 set_nlink(inode, 1); 1374 } 1375 inode->i_uid = sbi->s_uid; 1376 inode->i_gid = sbi->s_gid; 1377 inode->i_blocks = 0; 1378 1379 ei->i_format_parm[0] = 0; 1380 ei->i_format_parm[1] = 0; 1381 ei->i_format_parm[2] = 0; 1382 1383 ei->i_section_size = isonum_733(de->size); 1384 if (de->flags[-high_sierra] & 0x80) { 1385 ret = isofs_read_level3_size(inode); 1386 if (ret < 0) 1387 goto fail; 1388 ret = -EIO; 1389 } else { 1390 ei->i_next_section_block = 0; 1391 ei->i_next_section_offset = 0; 1392 inode->i_size = isonum_733(de->size); 1393 } 1394 1395 /* 1396 * Some dipshit decided to store some other bit of information 1397 * in the high byte of the file length. Truncate size in case 1398 * this CDROM was mounted with the cruft option. 1399 */ 1400 1401 if (sbi->s_cruft) 1402 inode->i_size &= 0x00ffffff; 1403 1404 if (de->interleave[0]) { 1405 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1406 inode->i_size = 0; 1407 } 1408 1409 /* I have no idea what file_unit_size is used for, so 1410 we will flag it for now */ 1411 if (de->file_unit_size[0] != 0) { 1412 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1413 inode->i_ino); 1414 } 1415 1416 /* I have no idea what other flag bits are used for, so 1417 we will flag it for now */ 1418 #ifdef DEBUG 1419 if((de->flags[-high_sierra] & ~2)!= 0){ 1420 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1421 "(%ld %x).\n", 1422 inode->i_ino, de->flags[-high_sierra]); 1423 } 1424 #endif 1425 1426 inode->i_mtime.tv_sec = 1427 inode->i_atime.tv_sec = 1428 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1429 inode->i_mtime.tv_nsec = 1430 inode->i_atime.tv_nsec = 1431 inode->i_ctime.tv_nsec = 0; 1432 1433 ei->i_first_extent = (isonum_733(de->extent) + 1434 isonum_711(de->ext_attr_length)); 1435 1436 /* Set the number of blocks for stat() - should be done before RR */ 1437 inode->i_blocks = (inode->i_size + 511) >> 9; 1438 1439 /* 1440 * Now test for possible Rock Ridge extensions which will override 1441 * some of these numbers in the inode structure. 1442 */ 1443 1444 if (!high_sierra) { 1445 parse_rock_ridge_inode(de, inode, relocated); 1446 /* if we want uid/gid set, override the rock ridge setting */ 1447 if (sbi->s_uid_set) 1448 inode->i_uid = sbi->s_uid; 1449 if (sbi->s_gid_set) 1450 inode->i_gid = sbi->s_gid; 1451 } 1452 /* Now set final access rights if overriding rock ridge setting */ 1453 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1454 sbi->s_dmode != ISOFS_INVALID_MODE) 1455 inode->i_mode = S_IFDIR | sbi->s_dmode; 1456 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1457 sbi->s_fmode != ISOFS_INVALID_MODE) 1458 inode->i_mode = S_IFREG | sbi->s_fmode; 1459 1460 /* Install the inode operations vector */ 1461 if (S_ISREG(inode->i_mode)) { 1462 inode->i_fop = &generic_ro_fops; 1463 switch (ei->i_file_format) { 1464 #ifdef CONFIG_ZISOFS 1465 case isofs_file_compressed: 1466 inode->i_data.a_ops = &zisofs_aops; 1467 break; 1468 #endif 1469 default: 1470 inode->i_data.a_ops = &isofs_aops; 1471 break; 1472 } 1473 } else if (S_ISDIR(inode->i_mode)) { 1474 inode->i_op = &isofs_dir_inode_operations; 1475 inode->i_fop = &isofs_dir_operations; 1476 } else if (S_ISLNK(inode->i_mode)) { 1477 inode->i_op = &page_symlink_inode_operations; 1478 inode_nohighmem(inode); 1479 inode->i_data.a_ops = &isofs_symlink_aops; 1480 } else 1481 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1482 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1483 1484 ret = 0; 1485 out: 1486 kfree(tmpde); 1487 if (bh) 1488 brelse(bh); 1489 return ret; 1490 1491 out_badread: 1492 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1493 fail: 1494 goto out; 1495 } 1496 1497 struct isofs_iget5_callback_data { 1498 unsigned long block; 1499 unsigned long offset; 1500 }; 1501 1502 static int isofs_iget5_test(struct inode *ino, void *data) 1503 { 1504 struct iso_inode_info *i = ISOFS_I(ino); 1505 struct isofs_iget5_callback_data *d = 1506 (struct isofs_iget5_callback_data*)data; 1507 return (i->i_iget5_block == d->block) 1508 && (i->i_iget5_offset == d->offset); 1509 } 1510 1511 static int isofs_iget5_set(struct inode *ino, void *data) 1512 { 1513 struct iso_inode_info *i = ISOFS_I(ino); 1514 struct isofs_iget5_callback_data *d = 1515 (struct isofs_iget5_callback_data*)data; 1516 i->i_iget5_block = d->block; 1517 i->i_iget5_offset = d->offset; 1518 return 0; 1519 } 1520 1521 /* Store, in the inode's containing structure, the block and block 1522 * offset that point to the underlying meta-data for the inode. The 1523 * code below is otherwise similar to the iget() code in 1524 * include/linux/fs.h */ 1525 struct inode *__isofs_iget(struct super_block *sb, 1526 unsigned long block, 1527 unsigned long offset, 1528 int relocated) 1529 { 1530 unsigned long hashval; 1531 struct inode *inode; 1532 struct isofs_iget5_callback_data data; 1533 long ret; 1534 1535 if (offset >= 1ul << sb->s_blocksize_bits) 1536 return ERR_PTR(-EINVAL); 1537 1538 data.block = block; 1539 data.offset = offset; 1540 1541 hashval = (block << sb->s_blocksize_bits) | offset; 1542 1543 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1544 &isofs_iget5_set, &data); 1545 1546 if (!inode) 1547 return ERR_PTR(-ENOMEM); 1548 1549 if (inode->i_state & I_NEW) { 1550 ret = isofs_read_inode(inode, relocated); 1551 if (ret < 0) { 1552 iget_failed(inode); 1553 inode = ERR_PTR(ret); 1554 } else { 1555 unlock_new_inode(inode); 1556 } 1557 } 1558 1559 return inode; 1560 } 1561 1562 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1563 int flags, const char *dev_name, void *data) 1564 { 1565 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1566 } 1567 1568 static struct file_system_type iso9660_fs_type = { 1569 .owner = THIS_MODULE, 1570 .name = "iso9660", 1571 .mount = isofs_mount, 1572 .kill_sb = kill_block_super, 1573 .fs_flags = FS_REQUIRES_DEV, 1574 }; 1575 MODULE_ALIAS_FS("iso9660"); 1576 MODULE_ALIAS("iso9660"); 1577 1578 static int __init init_iso9660_fs(void) 1579 { 1580 int err = init_inodecache(); 1581 if (err) 1582 goto out; 1583 #ifdef CONFIG_ZISOFS 1584 err = zisofs_init(); 1585 if (err) 1586 goto out1; 1587 #endif 1588 err = register_filesystem(&iso9660_fs_type); 1589 if (err) 1590 goto out2; 1591 return 0; 1592 out2: 1593 #ifdef CONFIG_ZISOFS 1594 zisofs_cleanup(); 1595 out1: 1596 #endif 1597 destroy_inodecache(); 1598 out: 1599 return err; 1600 } 1601 1602 static void __exit exit_iso9660_fs(void) 1603 { 1604 unregister_filesystem(&iso9660_fs_type); 1605 #ifdef CONFIG_ZISOFS 1606 zisofs_cleanup(); 1607 #endif 1608 destroy_inodecache(); 1609 } 1610 1611 module_init(init_iso9660_fs) 1612 module_exit(exit_iso9660_fs) 1613 MODULE_LICENSE("GPL"); 1614