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 38 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); 39 static int isofs_dentry_cmpi(const struct dentry *dentry, 40 unsigned int len, const char *str, const struct qstr *name); 41 42 #ifdef CONFIG_JOLIET 43 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); 44 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); 45 static int isofs_dentry_cmpi_ms(const struct dentry *dentry, 46 unsigned int len, const char *str, const struct qstr *name); 47 static int isofs_dentry_cmp_ms(const struct dentry *dentry, 48 unsigned int len, const char *str, const struct qstr *name); 49 #endif 50 51 static 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 64 static int isofs_read_inode(struct inode *, int relocated); 65 static int isofs_statfs (struct dentry *, struct kstatfs *); 66 static int isofs_show_options(struct seq_file *, struct dentry *); 67 68 static struct kmem_cache *isofs_inode_cachep; 69 70 static 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 79 static void isofs_free_inode(struct inode *inode) 80 { 81 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 82 } 83 84 static void init_once(void *foo) 85 { 86 struct iso_inode_info *ei = foo; 87 88 inode_init_once(&ei->vfs_inode); 89 } 90 91 static 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 } 102 103 static 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 } 112 113 static 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 } 120 121 static 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 }; 129 130 131 static 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 }; 147 148 struct 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 int utf8:1; 159 unsigned char map; 160 unsigned char check; 161 unsigned int blocksize; 162 umode_t fmode; 163 umode_t dmode; 164 kgid_t gid; 165 kuid_t uid; 166 char *iocharset; 167 /* LVE */ 168 s32 session; 169 s32 sbsector; 170 }; 171 172 /* 173 * Compute the hash for the isofs name corresponding to the dentry. 174 */ 175 static int 176 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) 177 { 178 const char *name; 179 int len; 180 char c; 181 unsigned long hash; 182 183 len = qstr->len; 184 name = qstr->name; 185 if (ms) { 186 while (len && name[len-1] == '.') 187 len--; 188 } 189 190 hash = init_name_hash(dentry); 191 while (len--) { 192 c = tolower(*name++); 193 hash = partial_name_hash(c, hash); 194 } 195 qstr->hash = end_name_hash(hash); 196 197 return 0; 198 } 199 200 /* 201 * Compare of two isofs names. 202 */ 203 static int isofs_dentry_cmp_common( 204 unsigned int len, const char *str, 205 const struct qstr *name, int ms, int ci) 206 { 207 int alen, blen; 208 209 /* A filename cannot end in '.' or we treat it like it has none */ 210 alen = name->len; 211 blen = len; 212 if (ms) { 213 while (alen && name->name[alen-1] == '.') 214 alen--; 215 while (blen && str[blen-1] == '.') 216 blen--; 217 } 218 if (alen == blen) { 219 if (ci) { 220 if (strncasecmp(name->name, str, alen) == 0) 221 return 0; 222 } else { 223 if (strncmp(name->name, str, alen) == 0) 224 return 0; 225 } 226 } 227 return 1; 228 } 229 230 static int 231 isofs_hashi(const struct dentry *dentry, struct qstr *qstr) 232 { 233 return isofs_hashi_common(dentry, qstr, 0); 234 } 235 236 static int 237 isofs_dentry_cmpi(const struct dentry *dentry, 238 unsigned int len, const char *str, const struct qstr *name) 239 { 240 return isofs_dentry_cmp_common(len, str, name, 0, 1); 241 } 242 243 #ifdef CONFIG_JOLIET 244 /* 245 * Compute the hash for the isofs name corresponding to the dentry. 246 */ 247 static int 248 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) 249 { 250 const char *name; 251 int len; 252 253 len = qstr->len; 254 name = qstr->name; 255 if (ms) { 256 while (len && name[len-1] == '.') 257 len--; 258 } 259 260 qstr->hash = full_name_hash(dentry, name, len); 261 262 return 0; 263 } 264 265 static int 266 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) 267 { 268 return isofs_hash_common(dentry, qstr, 1); 269 } 270 271 static int 272 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) 273 { 274 return isofs_hashi_common(dentry, qstr, 1); 275 } 276 277 static int 278 isofs_dentry_cmp_ms(const struct dentry *dentry, 279 unsigned int len, const char *str, const struct qstr *name) 280 { 281 return isofs_dentry_cmp_common(len, str, name, 1, 0); 282 } 283 284 static int 285 isofs_dentry_cmpi_ms(const struct dentry *dentry, 286 unsigned int len, const char *str, const struct qstr *name) 287 { 288 return isofs_dentry_cmp_common(len, str, name, 1, 1); 289 } 290 #endif 291 292 enum { 293 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, 294 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, 295 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, 296 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, 297 }; 298 299 static const match_table_t tokens = { 300 {Opt_norock, "norock"}, 301 {Opt_nojoliet, "nojoliet"}, 302 {Opt_unhide, "unhide"}, 303 {Opt_hide, "hide"}, 304 {Opt_showassoc, "showassoc"}, 305 {Opt_cruft, "cruft"}, 306 {Opt_utf8, "utf8"}, 307 {Opt_iocharset, "iocharset=%s"}, 308 {Opt_map_a, "map=acorn"}, 309 {Opt_map_a, "map=a"}, 310 {Opt_map_n, "map=normal"}, 311 {Opt_map_n, "map=n"}, 312 {Opt_map_o, "map=off"}, 313 {Opt_map_o, "map=o"}, 314 {Opt_session, "session=%u"}, 315 {Opt_sb, "sbsector=%u"}, 316 {Opt_check_r, "check=relaxed"}, 317 {Opt_check_r, "check=r"}, 318 {Opt_check_s, "check=strict"}, 319 {Opt_check_s, "check=s"}, 320 {Opt_uid, "uid=%u"}, 321 {Opt_gid, "gid=%u"}, 322 {Opt_mode, "mode=%u"}, 323 {Opt_dmode, "dmode=%u"}, 324 {Opt_overriderockperm, "overriderockperm"}, 325 {Opt_block, "block=%u"}, 326 {Opt_ignore, "conv=binary"}, 327 {Opt_ignore, "conv=b"}, 328 {Opt_ignore, "conv=text"}, 329 {Opt_ignore, "conv=t"}, 330 {Opt_ignore, "conv=mtext"}, 331 {Opt_ignore, "conv=m"}, 332 {Opt_ignore, "conv=auto"}, 333 {Opt_ignore, "conv=a"}, 334 {Opt_nocompress, "nocompress"}, 335 {Opt_err, NULL} 336 }; 337 338 static int parse_options(char *options, struct iso9660_options *popt) 339 { 340 char *p; 341 int option; 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->utf8 = 0; 359 popt->overriderockperm = 0; 360 popt->session=-1; 361 popt->sbsector=-1; 362 if (!options) 363 return 1; 364 365 while ((p = strsep(&options, ",")) != NULL) { 366 int token; 367 substring_t args[MAX_OPT_ARGS]; 368 unsigned n; 369 370 if (!*p) 371 continue; 372 373 token = match_token(p, tokens, args); 374 switch (token) { 375 case Opt_norock: 376 popt->rock = 0; 377 break; 378 case Opt_nojoliet: 379 popt->joliet = 0; 380 break; 381 case Opt_hide: 382 popt->hide = 1; 383 break; 384 case Opt_unhide: 385 case Opt_showassoc: 386 popt->showassoc = 1; 387 break; 388 case Opt_cruft: 389 popt->cruft = 1; 390 break; 391 case Opt_utf8: 392 popt->utf8 = 1; 393 break; 394 #ifdef CONFIG_JOLIET 395 case Opt_iocharset: 396 kfree(popt->iocharset); 397 popt->iocharset = match_strdup(&args[0]); 398 if (!popt->iocharset) 399 return 0; 400 break; 401 #endif 402 case Opt_map_a: 403 popt->map = 'a'; 404 break; 405 case Opt_map_o: 406 popt->map = 'o'; 407 break; 408 case Opt_map_n: 409 popt->map = 'n'; 410 break; 411 case Opt_session: 412 if (match_int(&args[0], &option)) 413 return 0; 414 n = option; 415 /* 416 * Track numbers are supposed to be in range 1-99, the 417 * mount option starts indexing at 0. 418 */ 419 if (n >= 99) 420 return 0; 421 popt->session = n + 1; 422 break; 423 case Opt_sb: 424 if (match_int(&args[0], &option)) 425 return 0; 426 popt->sbsector = option; 427 break; 428 case Opt_check_r: 429 popt->check = 'r'; 430 break; 431 case Opt_check_s: 432 popt->check = 's'; 433 break; 434 case Opt_ignore: 435 break; 436 case Opt_uid: 437 if (match_int(&args[0], &option)) 438 return 0; 439 popt->uid = make_kuid(current_user_ns(), option); 440 if (!uid_valid(popt->uid)) 441 return 0; 442 popt->uid_set = 1; 443 break; 444 case Opt_gid: 445 if (match_int(&args[0], &option)) 446 return 0; 447 popt->gid = make_kgid(current_user_ns(), option); 448 if (!gid_valid(popt->gid)) 449 return 0; 450 popt->gid_set = 1; 451 break; 452 case Opt_mode: 453 if (match_int(&args[0], &option)) 454 return 0; 455 popt->fmode = option; 456 break; 457 case Opt_dmode: 458 if (match_int(&args[0], &option)) 459 return 0; 460 popt->dmode = option; 461 break; 462 case Opt_overriderockperm: 463 popt->overriderockperm = 1; 464 break; 465 case Opt_block: 466 if (match_int(&args[0], &option)) 467 return 0; 468 n = option; 469 if (n != 512 && n != 1024 && n != 2048) 470 return 0; 471 popt->blocksize = n; 472 break; 473 case Opt_nocompress: 474 popt->nocompress = 1; 475 break; 476 default: 477 return 0; 478 } 479 } 480 return 1; 481 } 482 483 /* 484 * Display the mount options in /proc/mounts. 485 */ 486 static int isofs_show_options(struct seq_file *m, struct dentry *root) 487 { 488 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 489 490 if (!sbi->s_rock) seq_puts(m, ",norock"); 491 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 492 if (sbi->s_cruft) seq_puts(m, ",cruft"); 493 if (sbi->s_hide) seq_puts(m, ",hide"); 494 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 495 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 496 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 497 if (sbi->s_utf8) seq_puts(m, ",utf8"); 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 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0) 522 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 523 #endif 524 return 0; 525 } 526 527 /* 528 * look if the driver can tell the multi session redirection value 529 * 530 * don't change this if you don't know what you do, please! 531 * Multisession is legal only with XA disks. 532 * A non-XA disk with more than one volume descriptor may do it right, but 533 * usually is written in a nowhere standardized "multi-partition" manner. 534 * Multisession uses absolute addressing (solely the first frame of the whole 535 * track is #0), multi-partition uses relative addressing (each first frame of 536 * each track is #0), and a track is not a session. 537 * 538 * A broken CDwriter software or drive firmware does not set new standards, 539 * at least not if conflicting with the existing ones. 540 * 541 * emoenke@gwdg.de 542 */ 543 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 544 545 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 546 { 547 struct cdrom_multisession ms_info; 548 unsigned int vol_desc_start; 549 struct block_device *bdev = sb->s_bdev; 550 int i; 551 552 vol_desc_start=0; 553 ms_info.addr_format=CDROM_LBA; 554 if (session > 0) { 555 struct cdrom_tocentry Te; 556 Te.cdte_track=session; 557 Te.cdte_format=CDROM_LBA; 558 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); 559 if (!i) { 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 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); 570 if (session > 0) 571 printk(KERN_ERR "ISOFS: Invalid session number\n"); 572 #if 0 573 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); 574 if (i==0) { 575 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); 576 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); 577 } 578 #endif 579 if (i==0) 580 #if WE_OBEY_THE_WRITTEN_STANDARDS 581 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ 582 #endif 583 vol_desc_start=ms_info.addr.lba; 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 */ 594 static 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 * 618 * Note: a check_disk_change() has been done immediately prior 619 * to this call, so we don't need to check again. 620 */ 621 static int isofs_fill_super(struct super_block *s, void *data, int silent) 622 { 623 struct buffer_head *bh = NULL, *pri_bh = NULL; 624 struct hs_primary_descriptor *h_pri = NULL; 625 struct iso_primary_descriptor *pri = NULL; 626 struct iso_supplementary_descriptor *sec = NULL; 627 struct iso_directory_record *rootp; 628 struct inode *inode; 629 struct iso9660_options opt; 630 struct isofs_sb_info *sbi; 631 unsigned long first_data_zone; 632 int joliet_level = 0; 633 int iso_blknum, block; 634 int orig_zonesize; 635 int table, error = -EINVAL; 636 unsigned int vol_desc_start; 637 638 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 639 if (!sbi) 640 return -ENOMEM; 641 s->s_fs_info = sbi; 642 643 if (!parse_options((char *)data, &opt)) 644 goto out_freesbi; 645 646 /* 647 * First of all, get the hardware blocksize for this device. 648 * If we don't know what it is, or the hardware blocksize is 649 * larger than the blocksize the user specified, then use 650 * that value. 651 */ 652 /* 653 * What if bugger tells us to go beyond page size? 654 */ 655 if (bdev_logical_block_size(s->s_bdev) > 2048) { 656 printk(KERN_WARNING 657 "ISOFS: unsupported/invalid hardware sector size %d\n", 658 bdev_logical_block_size(s->s_bdev)); 659 goto out_freesbi; 660 } 661 opt.blocksize = sb_min_blocksize(s, opt.blocksize); 662 663 sbi->s_high_sierra = 0; /* default is iso9660 */ 664 sbi->s_session = opt.session; 665 sbi->s_sbsector = opt.sbsector; 666 667 vol_desc_start = (opt.sbsector != -1) ? 668 opt.sbsector : isofs_get_last_session(s,opt.session); 669 670 for (iso_blknum = vol_desc_start+16; 671 iso_blknum < vol_desc_start+100; iso_blknum++) { 672 struct hs_volume_descriptor *hdp; 673 struct iso_volume_descriptor *vdp; 674 675 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 676 if (!(bh = sb_bread(s, block))) 677 goto out_no_read; 678 679 vdp = (struct iso_volume_descriptor *)bh->b_data; 680 hdp = (struct hs_volume_descriptor *)bh->b_data; 681 682 /* 683 * Due to the overlapping physical location of the descriptors, 684 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 685 * proper identification in this case, we first check for ISO. 686 */ 687 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 688 if (isonum_711(vdp->type) == ISO_VD_END) 689 break; 690 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 691 if (!pri) { 692 pri = (struct iso_primary_descriptor *)vdp; 693 /* Save the buffer in case we need it ... */ 694 pri_bh = bh; 695 bh = NULL; 696 } 697 } 698 #ifdef CONFIG_JOLIET 699 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 700 sec = (struct iso_supplementary_descriptor *)vdp; 701 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 702 if (opt.joliet) { 703 if (sec->escape[2] == 0x40) 704 joliet_level = 1; 705 else if (sec->escape[2] == 0x43) 706 joliet_level = 2; 707 else if (sec->escape[2] == 0x45) 708 joliet_level = 3; 709 710 printk(KERN_DEBUG "ISO 9660 Extensions: " 711 "Microsoft Joliet Level %d\n", 712 joliet_level); 713 } 714 goto root_found; 715 } else { 716 /* Unknown supplementary volume descriptor */ 717 sec = NULL; 718 } 719 } 720 #endif 721 } else { 722 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 723 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 724 goto out_freebh; 725 726 sbi->s_high_sierra = 1; 727 opt.rock = 0; 728 h_pri = (struct hs_primary_descriptor *)vdp; 729 goto root_found; 730 } 731 } 732 733 /* Just skip any volume descriptors we don't recognize */ 734 735 brelse(bh); 736 bh = NULL; 737 } 738 /* 739 * If we fall through, either no volume descriptor was found, 740 * or else we passed a primary descriptor looking for others. 741 */ 742 if (!pri) 743 goto out_unknown_format; 744 brelse(bh); 745 bh = pri_bh; 746 pri_bh = NULL; 747 748 root_found: 749 /* We don't support read-write mounts */ 750 if (!sb_rdonly(s)) { 751 error = -EACCES; 752 goto out_freebh; 753 } 754 755 if (joliet_level && (!pri || !opt.rock)) { 756 /* This is the case of Joliet with the norock mount flag. 757 * A disc with both Joliet and Rock Ridge is handled later 758 */ 759 pri = (struct iso_primary_descriptor *) sec; 760 } 761 762 if(sbi->s_high_sierra){ 763 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 764 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 765 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 766 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 767 } else { 768 if (!pri) 769 goto out_freebh; 770 rootp = (struct iso_directory_record *) pri->root_directory_record; 771 sbi->s_nzones = isonum_733(pri->volume_space_size); 772 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 773 sbi->s_max_size = isonum_733(pri->volume_space_size); 774 } 775 776 sbi->s_ninodes = 0; /* No way to figure this out easily */ 777 778 orig_zonesize = sbi->s_log_zone_size; 779 /* 780 * If the zone size is smaller than the hardware sector size, 781 * this is a fatal error. This would occur if the disc drive 782 * had sectors that were 2048 bytes, but the filesystem had 783 * blocks that were 512 bytes (which should only very rarely 784 * happen.) 785 */ 786 if (orig_zonesize < opt.blocksize) 787 goto out_bad_size; 788 789 /* RDE: convert log zone size to bit shift */ 790 switch (sbi->s_log_zone_size) { 791 case 512: sbi->s_log_zone_size = 9; break; 792 case 1024: sbi->s_log_zone_size = 10; break; 793 case 2048: sbi->s_log_zone_size = 11; break; 794 795 default: 796 goto out_bad_zone_size; 797 } 798 799 s->s_magic = ISOFS_SUPER_MAGIC; 800 801 /* 802 * With multi-extent files, file size is only limited by the maximum 803 * size of a file system, which is 8 TB. 804 */ 805 s->s_maxbytes = 0x80000000000LL; 806 807 /* ECMA-119 timestamp from 1900/1/1 with tz offset */ 808 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET; 809 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET; 810 811 /* Set this for reference. Its not currently used except on write 812 which we don't have .. */ 813 814 first_data_zone = isonum_733(rootp->extent) + 815 isonum_711(rootp->ext_attr_length); 816 sbi->s_firstdatazone = first_data_zone; 817 #ifndef BEQUIET 818 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 819 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 820 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 821 if(sbi->s_high_sierra) 822 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 823 #endif 824 825 /* 826 * If the Joliet level is set, we _may_ decide to use the 827 * secondary descriptor, but can't be sure until after we 828 * read the root inode. But before reading the root inode 829 * we may need to change the device blocksize, and would 830 * rather release the old buffer first. So, we cache the 831 * first_data_zone value from the secondary descriptor. 832 */ 833 if (joliet_level) { 834 pri = (struct iso_primary_descriptor *) sec; 835 rootp = (struct iso_directory_record *) 836 pri->root_directory_record; 837 first_data_zone = isonum_733(rootp->extent) + 838 isonum_711(rootp->ext_attr_length); 839 } 840 841 /* 842 * We're all done using the volume descriptor, and may need 843 * to change the device blocksize, so release the buffer now. 844 */ 845 brelse(pri_bh); 846 brelse(bh); 847 848 /* 849 * Force the blocksize to 512 for 512 byte sectors. The file 850 * read primitives really get it wrong in a bad way if we don't 851 * do this. 852 * 853 * Note - we should never be setting the blocksize to something 854 * less than the hardware sector size for the device. If we 855 * do, we would end up having to read larger buffers and split 856 * out portions to satisfy requests. 857 * 858 * Note2- the idea here is that we want to deal with the optimal 859 * zonesize in the filesystem. If we have it set to something less, 860 * then we have horrible problems with trying to piece together 861 * bits of adjacent blocks in order to properly read directory 862 * entries. By forcing the blocksize in this way, we ensure 863 * that we will never be required to do this. 864 */ 865 sb_set_blocksize(s, orig_zonesize); 866 867 sbi->s_nls_iocharset = NULL; 868 869 #ifdef CONFIG_JOLIET 870 if (joliet_level && opt.utf8 == 0) { 871 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; 872 sbi->s_nls_iocharset = load_nls(p); 873 if (! sbi->s_nls_iocharset) { 874 /* Fail only if explicit charset specified */ 875 if (opt.iocharset) 876 goto out_freesbi; 877 sbi->s_nls_iocharset = load_nls_default(); 878 } 879 } 880 #endif 881 s->s_op = &isofs_sops; 882 s->s_export_op = &isofs_export_ops; 883 sbi->s_mapping = opt.map; 884 sbi->s_rock = (opt.rock ? 2 : 0); 885 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 886 sbi->s_cruft = opt.cruft; 887 sbi->s_hide = opt.hide; 888 sbi->s_showassoc = opt.showassoc; 889 sbi->s_uid = opt.uid; 890 sbi->s_gid = opt.gid; 891 sbi->s_uid_set = opt.uid_set; 892 sbi->s_gid_set = opt.gid_set; 893 sbi->s_utf8 = opt.utf8; 894 sbi->s_nocompress = opt.nocompress; 895 sbi->s_overriderockperm = opt.overriderockperm; 896 /* 897 * It would be incredibly stupid to allow people to mark every file 898 * on the disk as suid, so we merely allow them to set the default 899 * permissions. 900 */ 901 if (opt.fmode != ISOFS_INVALID_MODE) 902 sbi->s_fmode = opt.fmode & 0777; 903 else 904 sbi->s_fmode = ISOFS_INVALID_MODE; 905 if (opt.dmode != ISOFS_INVALID_MODE) 906 sbi->s_dmode = opt.dmode & 0777; 907 else 908 sbi->s_dmode = ISOFS_INVALID_MODE; 909 910 /* 911 * Read the root inode, which _may_ result in changing 912 * the s_rock flag. Once we have the final s_rock value, 913 * we then decide whether to use the Joliet descriptor. 914 */ 915 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 916 if (IS_ERR(inode)) 917 goto out_no_root; 918 919 /* 920 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 921 * correct Joliet root directory. 922 */ 923 if (sbi->s_rock == 1 && joliet_level && 924 rootdir_empty(s, sbi->s_firstdatazone)) { 925 printk(KERN_NOTICE 926 "ISOFS: primary root directory is empty. " 927 "Disabling Rock Ridge and switching to Joliet."); 928 sbi->s_rock = 0; 929 } 930 931 /* 932 * If this disk has both Rock Ridge and Joliet on it, then we 933 * want to use Rock Ridge by default. This can be overridden 934 * by using the norock mount option. There is still one other 935 * possibility that is not taken into account: a Rock Ridge 936 * CD with Unicode names. Until someone sees such a beast, it 937 * will not be supported. 938 */ 939 if (sbi->s_rock == 1) { 940 joliet_level = 0; 941 } else if (joliet_level) { 942 sbi->s_rock = 0; 943 if (sbi->s_firstdatazone != first_data_zone) { 944 sbi->s_firstdatazone = first_data_zone; 945 printk(KERN_DEBUG 946 "ISOFS: changing to secondary root\n"); 947 iput(inode); 948 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 949 if (IS_ERR(inode)) 950 goto out_no_root; 951 } 952 } 953 954 if (opt.check == 'u') { 955 /* Only Joliet is case insensitive by default */ 956 if (joliet_level) 957 opt.check = 'r'; 958 else 959 opt.check = 's'; 960 } 961 sbi->s_joliet_level = joliet_level; 962 963 /* Make sure the root inode is a directory */ 964 if (!S_ISDIR(inode->i_mode)) { 965 printk(KERN_WARNING 966 "isofs_fill_super: root inode is not a directory. " 967 "Corrupted media?\n"); 968 goto out_iput; 969 } 970 971 table = 0; 972 if (joliet_level) 973 table += 2; 974 if (opt.check == 'r') 975 table++; 976 sbi->s_check = opt.check; 977 978 if (table) 979 s->s_d_op = &isofs_dentry_ops[table - 1]; 980 981 /* get the root dentry */ 982 s->s_root = d_make_root(inode); 983 if (!(s->s_root)) { 984 error = -ENOMEM; 985 goto out_no_inode; 986 } 987 988 kfree(opt.iocharset); 989 990 return 0; 991 992 /* 993 * Display error messages and free resources. 994 */ 995 out_iput: 996 iput(inode); 997 goto out_no_inode; 998 out_no_root: 999 error = PTR_ERR(inode); 1000 if (error != -ENOMEM) 1001 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 1002 out_no_inode: 1003 #ifdef CONFIG_JOLIET 1004 unload_nls(sbi->s_nls_iocharset); 1005 #endif 1006 goto out_freesbi; 1007 out_no_read: 1008 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 1009 __func__, s->s_id, iso_blknum, block); 1010 goto out_freebh; 1011 out_bad_zone_size: 1012 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 1013 sbi->s_log_zone_size); 1014 goto out_freebh; 1015 out_bad_size: 1016 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 1017 orig_zonesize, opt.blocksize); 1018 goto out_freebh; 1019 out_unknown_format: 1020 if (!silent) 1021 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 1022 1023 out_freebh: 1024 brelse(bh); 1025 brelse(pri_bh); 1026 out_freesbi: 1027 kfree(opt.iocharset); 1028 kfree(sbi); 1029 s->s_fs_info = NULL; 1030 return error; 1031 } 1032 1033 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1034 { 1035 struct super_block *sb = dentry->d_sb; 1036 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1037 1038 buf->f_type = ISOFS_SUPER_MAGIC; 1039 buf->f_bsize = sb->s_blocksize; 1040 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1041 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1042 buf->f_bfree = 0; 1043 buf->f_bavail = 0; 1044 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1045 buf->f_ffree = 0; 1046 buf->f_fsid.val[0] = (u32)id; 1047 buf->f_fsid.val[1] = (u32)(id >> 32); 1048 buf->f_namelen = NAME_MAX; 1049 return 0; 1050 } 1051 1052 /* 1053 * Get a set of blocks; filling in buffer_heads if already allocated 1054 * or getblk() if they are not. Returns the number of blocks inserted 1055 * (-ve == error.) 1056 */ 1057 int isofs_get_blocks(struct inode *inode, sector_t iblock, 1058 struct buffer_head **bh, unsigned long nblocks) 1059 { 1060 unsigned long b_off = iblock; 1061 unsigned offset, sect_size; 1062 unsigned int firstext; 1063 unsigned long nextblk, nextoff; 1064 int section, rv, error; 1065 struct iso_inode_info *ei = ISOFS_I(inode); 1066 1067 error = -EIO; 1068 rv = 0; 1069 if (iblock != b_off) { 1070 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1071 goto abort; 1072 } 1073 1074 1075 offset = 0; 1076 firstext = ei->i_first_extent; 1077 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1078 nextblk = ei->i_next_section_block; 1079 nextoff = ei->i_next_section_offset; 1080 section = 0; 1081 1082 while (nblocks) { 1083 /* If we are *way* beyond the end of the file, print a message. 1084 * Access beyond the end of the file up to the next page boundary 1085 * is normal, however because of the way the page cache works. 1086 * In this case, we just return 0 so that we can properly fill 1087 * the page with useless information without generating any 1088 * I/O errors. 1089 */ 1090 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1091 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1092 __func__, b_off, 1093 (unsigned long long)inode->i_size); 1094 goto abort; 1095 } 1096 1097 /* On the last section, nextblk == 0, section size is likely to 1098 * exceed sect_size by a partial block, and access beyond the 1099 * end of the file will reach beyond the section size, too. 1100 */ 1101 while (nextblk && (b_off >= (offset + sect_size))) { 1102 struct inode *ninode; 1103 1104 offset += sect_size; 1105 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1106 if (IS_ERR(ninode)) { 1107 error = PTR_ERR(ninode); 1108 goto abort; 1109 } 1110 firstext = ISOFS_I(ninode)->i_first_extent; 1111 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1112 nextblk = ISOFS_I(ninode)->i_next_section_block; 1113 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1114 iput(ninode); 1115 1116 if (++section > 100) { 1117 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1118 " aborting...\n", __func__); 1119 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1120 "nextblk=%lu nextoff=%lu\n", __func__, 1121 b_off, firstext, (unsigned) sect_size, 1122 nextblk, nextoff); 1123 goto abort; 1124 } 1125 } 1126 1127 if (*bh) { 1128 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1129 } else { 1130 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1131 if (!*bh) 1132 goto abort; 1133 } 1134 bh++; /* Next buffer head */ 1135 b_off++; /* Next buffer offset */ 1136 nblocks--; 1137 rv++; 1138 } 1139 1140 error = 0; 1141 abort: 1142 return rv != 0 ? rv : error; 1143 } 1144 1145 /* 1146 * Used by the standard interfaces. 1147 */ 1148 static int isofs_get_block(struct inode *inode, sector_t iblock, 1149 struct buffer_head *bh_result, int create) 1150 { 1151 int ret; 1152 1153 if (create) { 1154 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1155 return -EROFS; 1156 } 1157 1158 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1159 return ret < 0 ? ret : 0; 1160 } 1161 1162 static int isofs_bmap(struct inode *inode, sector_t block) 1163 { 1164 struct buffer_head dummy; 1165 int error; 1166 1167 dummy.b_state = 0; 1168 dummy.b_blocknr = -1000; 1169 error = isofs_get_block(inode, block, &dummy, 0); 1170 if (!error) 1171 return dummy.b_blocknr; 1172 return 0; 1173 } 1174 1175 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1176 { 1177 sector_t blknr = isofs_bmap(inode, block); 1178 if (!blknr) 1179 return NULL; 1180 return sb_bread(inode->i_sb, blknr); 1181 } 1182 1183 static int isofs_readpage(struct file *file, struct page *page) 1184 { 1185 return mpage_readpage(page, isofs_get_block); 1186 } 1187 1188 static int isofs_readpages(struct file *file, struct address_space *mapping, 1189 struct list_head *pages, unsigned nr_pages) 1190 { 1191 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block); 1192 } 1193 1194 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1195 { 1196 return generic_block_bmap(mapping,block,isofs_get_block); 1197 } 1198 1199 static const struct address_space_operations isofs_aops = { 1200 .readpage = isofs_readpage, 1201 .readpages = isofs_readpages, 1202 .bmap = _isofs_bmap 1203 }; 1204 1205 static int isofs_read_level3_size(struct inode *inode) 1206 { 1207 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1208 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1209 struct buffer_head *bh = NULL; 1210 unsigned long block, offset, block_saved, offset_saved; 1211 int i = 0; 1212 int more_entries = 0; 1213 struct iso_directory_record *tmpde = NULL; 1214 struct iso_inode_info *ei = ISOFS_I(inode); 1215 1216 inode->i_size = 0; 1217 1218 /* The first 16 blocks are reserved as the System Area. Thus, 1219 * no inodes can appear in block 0. We use this to flag that 1220 * this is the last section. */ 1221 ei->i_next_section_block = 0; 1222 ei->i_next_section_offset = 0; 1223 1224 block = ei->i_iget5_block; 1225 offset = ei->i_iget5_offset; 1226 1227 do { 1228 struct iso_directory_record *de; 1229 unsigned int de_len; 1230 1231 if (!bh) { 1232 bh = sb_bread(inode->i_sb, block); 1233 if (!bh) 1234 goto out_noread; 1235 } 1236 de = (struct iso_directory_record *) (bh->b_data + offset); 1237 de_len = *(unsigned char *) de; 1238 1239 if (de_len == 0) { 1240 brelse(bh); 1241 bh = NULL; 1242 ++block; 1243 offset = 0; 1244 continue; 1245 } 1246 1247 block_saved = block; 1248 offset_saved = offset; 1249 offset += de_len; 1250 1251 /* Make sure we have a full directory entry */ 1252 if (offset >= bufsize) { 1253 int slop = bufsize - offset + de_len; 1254 if (!tmpde) { 1255 tmpde = kmalloc(256, GFP_KERNEL); 1256 if (!tmpde) 1257 goto out_nomem; 1258 } 1259 memcpy(tmpde, de, slop); 1260 offset &= bufsize - 1; 1261 block++; 1262 brelse(bh); 1263 bh = NULL; 1264 if (offset) { 1265 bh = sb_bread(inode->i_sb, block); 1266 if (!bh) 1267 goto out_noread; 1268 memcpy((void *)tmpde+slop, bh->b_data, offset); 1269 } 1270 de = tmpde; 1271 } 1272 1273 inode->i_size += isonum_733(de->size); 1274 if (i == 1) { 1275 ei->i_next_section_block = block_saved; 1276 ei->i_next_section_offset = offset_saved; 1277 } 1278 1279 more_entries = de->flags[-high_sierra] & 0x80; 1280 1281 i++; 1282 if (i > 100) 1283 goto out_toomany; 1284 } while (more_entries); 1285 out: 1286 kfree(tmpde); 1287 if (bh) 1288 brelse(bh); 1289 return 0; 1290 1291 out_nomem: 1292 if (bh) 1293 brelse(bh); 1294 return -ENOMEM; 1295 1296 out_noread: 1297 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1298 kfree(tmpde); 1299 return -EIO; 1300 1301 out_toomany: 1302 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" 1303 "isofs_read_level3_size: inode=%lu\n", 1304 __func__, inode->i_ino); 1305 goto out; 1306 } 1307 1308 static int isofs_read_inode(struct inode *inode, int relocated) 1309 { 1310 struct super_block *sb = inode->i_sb; 1311 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1312 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1313 unsigned long block; 1314 int high_sierra = sbi->s_high_sierra; 1315 struct buffer_head *bh; 1316 struct iso_directory_record *de; 1317 struct iso_directory_record *tmpde = NULL; 1318 unsigned int de_len; 1319 unsigned long offset; 1320 struct iso_inode_info *ei = ISOFS_I(inode); 1321 int ret = -EIO; 1322 1323 block = ei->i_iget5_block; 1324 bh = sb_bread(inode->i_sb, block); 1325 if (!bh) 1326 goto out_badread; 1327 1328 offset = ei->i_iget5_offset; 1329 1330 de = (struct iso_directory_record *) (bh->b_data + offset); 1331 de_len = *(unsigned char *) de; 1332 1333 if (offset + de_len > bufsize) { 1334 int frag1 = bufsize - offset; 1335 1336 tmpde = kmalloc(de_len, GFP_KERNEL); 1337 if (!tmpde) { 1338 ret = -ENOMEM; 1339 goto fail; 1340 } 1341 memcpy(tmpde, bh->b_data + offset, frag1); 1342 brelse(bh); 1343 bh = sb_bread(inode->i_sb, ++block); 1344 if (!bh) 1345 goto out_badread; 1346 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1347 de = tmpde; 1348 } 1349 1350 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1351 ei->i_iget5_offset, 1352 ISOFS_BUFFER_BITS(inode)); 1353 1354 /* Assume it is a normal-format file unless told otherwise */ 1355 ei->i_file_format = isofs_file_normal; 1356 1357 if (de->flags[-high_sierra] & 2) { 1358 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1359 inode->i_mode = S_IFDIR | sbi->s_dmode; 1360 else 1361 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1362 set_nlink(inode, 1); /* 1363 * Set to 1. We know there are 2, but 1364 * the find utility tries to optimize 1365 * if it is 2, and it screws up. It is 1366 * easier to give 1 which tells find to 1367 * do it the hard way. 1368 */ 1369 } else { 1370 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1371 inode->i_mode = S_IFREG | sbi->s_fmode; 1372 } else { 1373 /* 1374 * Set default permissions: r-x for all. The disc 1375 * could be shared with DOS machines so virtually 1376 * anything could be a valid executable. 1377 */ 1378 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1379 } 1380 set_nlink(inode, 1); 1381 } 1382 inode->i_uid = sbi->s_uid; 1383 inode->i_gid = sbi->s_gid; 1384 inode->i_blocks = 0; 1385 1386 ei->i_format_parm[0] = 0; 1387 ei->i_format_parm[1] = 0; 1388 ei->i_format_parm[2] = 0; 1389 1390 ei->i_section_size = isonum_733(de->size); 1391 if (de->flags[-high_sierra] & 0x80) { 1392 ret = isofs_read_level3_size(inode); 1393 if (ret < 0) 1394 goto fail; 1395 ret = -EIO; 1396 } else { 1397 ei->i_next_section_block = 0; 1398 ei->i_next_section_offset = 0; 1399 inode->i_size = isonum_733(de->size); 1400 } 1401 1402 /* 1403 * Some dipshit decided to store some other bit of information 1404 * in the high byte of the file length. Truncate size in case 1405 * this CDROM was mounted with the cruft option. 1406 */ 1407 1408 if (sbi->s_cruft) 1409 inode->i_size &= 0x00ffffff; 1410 1411 if (de->interleave[0]) { 1412 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1413 inode->i_size = 0; 1414 } 1415 1416 /* I have no idea what file_unit_size is used for, so 1417 we will flag it for now */ 1418 if (de->file_unit_size[0] != 0) { 1419 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", 1420 inode->i_ino); 1421 } 1422 1423 /* I have no idea what other flag bits are used for, so 1424 we will flag it for now */ 1425 #ifdef DEBUG 1426 if((de->flags[-high_sierra] & ~2)!= 0){ 1427 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1428 "(%ld %x).\n", 1429 inode->i_ino, de->flags[-high_sierra]); 1430 } 1431 #endif 1432 1433 inode->i_mtime.tv_sec = 1434 inode->i_atime.tv_sec = 1435 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); 1436 inode->i_mtime.tv_nsec = 1437 inode->i_atime.tv_nsec = 1438 inode->i_ctime.tv_nsec = 0; 1439 1440 ei->i_first_extent = (isonum_733(de->extent) + 1441 isonum_711(de->ext_attr_length)); 1442 1443 /* Set the number of blocks for stat() - should be done before RR */ 1444 inode->i_blocks = (inode->i_size + 511) >> 9; 1445 1446 /* 1447 * Now test for possible Rock Ridge extensions which will override 1448 * some of these numbers in the inode structure. 1449 */ 1450 1451 if (!high_sierra) { 1452 parse_rock_ridge_inode(de, inode, relocated); 1453 /* if we want uid/gid set, override the rock ridge setting */ 1454 if (sbi->s_uid_set) 1455 inode->i_uid = sbi->s_uid; 1456 if (sbi->s_gid_set) 1457 inode->i_gid = sbi->s_gid; 1458 } 1459 /* Now set final access rights if overriding rock ridge setting */ 1460 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1461 sbi->s_dmode != ISOFS_INVALID_MODE) 1462 inode->i_mode = S_IFDIR | sbi->s_dmode; 1463 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1464 sbi->s_fmode != ISOFS_INVALID_MODE) 1465 inode->i_mode = S_IFREG | sbi->s_fmode; 1466 1467 /* Install the inode operations vector */ 1468 if (S_ISREG(inode->i_mode)) { 1469 inode->i_fop = &generic_ro_fops; 1470 switch (ei->i_file_format) { 1471 #ifdef CONFIG_ZISOFS 1472 case isofs_file_compressed: 1473 inode->i_data.a_ops = &zisofs_aops; 1474 break; 1475 #endif 1476 default: 1477 inode->i_data.a_ops = &isofs_aops; 1478 break; 1479 } 1480 } else if (S_ISDIR(inode->i_mode)) { 1481 inode->i_op = &isofs_dir_inode_operations; 1482 inode->i_fop = &isofs_dir_operations; 1483 } else if (S_ISLNK(inode->i_mode)) { 1484 inode->i_op = &page_symlink_inode_operations; 1485 inode_nohighmem(inode); 1486 inode->i_data.a_ops = &isofs_symlink_aops; 1487 } else 1488 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1489 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1490 1491 ret = 0; 1492 out: 1493 kfree(tmpde); 1494 if (bh) 1495 brelse(bh); 1496 return ret; 1497 1498 out_badread: 1499 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1500 fail: 1501 goto out; 1502 } 1503 1504 struct isofs_iget5_callback_data { 1505 unsigned long block; 1506 unsigned long offset; 1507 }; 1508 1509 static int isofs_iget5_test(struct inode *ino, void *data) 1510 { 1511 struct iso_inode_info *i = ISOFS_I(ino); 1512 struct isofs_iget5_callback_data *d = 1513 (struct isofs_iget5_callback_data*)data; 1514 return (i->i_iget5_block == d->block) 1515 && (i->i_iget5_offset == d->offset); 1516 } 1517 1518 static int isofs_iget5_set(struct inode *ino, void *data) 1519 { 1520 struct iso_inode_info *i = ISOFS_I(ino); 1521 struct isofs_iget5_callback_data *d = 1522 (struct isofs_iget5_callback_data*)data; 1523 i->i_iget5_block = d->block; 1524 i->i_iget5_offset = d->offset; 1525 return 0; 1526 } 1527 1528 /* Store, in the inode's containing structure, the block and block 1529 * offset that point to the underlying meta-data for the inode. The 1530 * code below is otherwise similar to the iget() code in 1531 * include/linux/fs.h */ 1532 struct inode *__isofs_iget(struct super_block *sb, 1533 unsigned long block, 1534 unsigned long offset, 1535 int relocated) 1536 { 1537 unsigned long hashval; 1538 struct inode *inode; 1539 struct isofs_iget5_callback_data data; 1540 long ret; 1541 1542 if (offset >= 1ul << sb->s_blocksize_bits) 1543 return ERR_PTR(-EINVAL); 1544 1545 data.block = block; 1546 data.offset = offset; 1547 1548 hashval = (block << sb->s_blocksize_bits) | offset; 1549 1550 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1551 &isofs_iget5_set, &data); 1552 1553 if (!inode) 1554 return ERR_PTR(-ENOMEM); 1555 1556 if (inode->i_state & I_NEW) { 1557 ret = isofs_read_inode(inode, relocated); 1558 if (ret < 0) { 1559 iget_failed(inode); 1560 inode = ERR_PTR(ret); 1561 } else { 1562 unlock_new_inode(inode); 1563 } 1564 } 1565 1566 return inode; 1567 } 1568 1569 static struct dentry *isofs_mount(struct file_system_type *fs_type, 1570 int flags, const char *dev_name, void *data) 1571 { 1572 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); 1573 } 1574 1575 static struct file_system_type iso9660_fs_type = { 1576 .owner = THIS_MODULE, 1577 .name = "iso9660", 1578 .mount = isofs_mount, 1579 .kill_sb = kill_block_super, 1580 .fs_flags = FS_REQUIRES_DEV, 1581 }; 1582 MODULE_ALIAS_FS("iso9660"); 1583 MODULE_ALIAS("iso9660"); 1584 1585 static int __init init_iso9660_fs(void) 1586 { 1587 int err = init_inodecache(); 1588 if (err) 1589 goto out; 1590 #ifdef CONFIG_ZISOFS 1591 err = zisofs_init(); 1592 if (err) 1593 goto out1; 1594 #endif 1595 err = register_filesystem(&iso9660_fs_type); 1596 if (err) 1597 goto out2; 1598 return 0; 1599 out2: 1600 #ifdef CONFIG_ZISOFS 1601 zisofs_cleanup(); 1602 out1: 1603 #endif 1604 destroy_inodecache(); 1605 out: 1606 return err; 1607 } 1608 1609 static void __exit exit_iso9660_fs(void) 1610 { 1611 unregister_filesystem(&iso9660_fs_type); 1612 #ifdef CONFIG_ZISOFS 1613 zisofs_cleanup(); 1614 #endif 1615 destroy_inodecache(); 1616 } 1617 1618 module_init(init_iso9660_fs) 1619 module_exit(exit_iso9660_fs) 1620 MODULE_LICENSE("GPL"); 1621