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/mpage.h> 25 #include <linux/user_namespace.h> 26 #include <linux/seq_file.h> 27 #include <linux/blkdev.h> 28 #include <linux/fs_context.h> 29 #include <linux/fs_parser.h> 30 31 #include "isofs.h" 32 #include "zisofs.h" 33 34 /* max tz offset is 13 hours */ 35 #define MAX_TZ_OFFSET (52*15*60) 36 37 #define BEQUIET 38 39 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); 40 static int isofs_dentry_cmpi(const struct dentry *dentry, 41 unsigned int len, const char *str, const struct qstr *name); 42 43 #ifdef CONFIG_JOLIET 44 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); 45 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); 46 static int isofs_dentry_cmpi_ms(const struct dentry *dentry, 47 unsigned int len, const char *str, const struct qstr *name); 48 static int isofs_dentry_cmp_ms(const struct dentry *dentry, 49 unsigned int len, const char *str, const struct qstr *name); 50 #endif 51 52 static void isofs_put_super(struct super_block *sb) 53 { 54 struct isofs_sb_info *sbi = ISOFS_SB(sb); 55 56 #ifdef CONFIG_JOLIET 57 unload_nls(sbi->s_nls_iocharset); 58 #endif 59 60 kfree(sbi); 61 sb->s_fs_info = NULL; 62 return; 63 } 64 65 static int isofs_read_inode(struct inode *, int relocated); 66 static int isofs_statfs (struct dentry *, struct kstatfs *); 67 static int isofs_show_options(struct seq_file *, struct dentry *); 68 69 static struct kmem_cache *isofs_inode_cachep; 70 71 static struct inode *isofs_alloc_inode(struct super_block *sb) 72 { 73 struct iso_inode_info *ei; 74 ei = alloc_inode_sb(sb, isofs_inode_cachep, GFP_KERNEL); 75 if (!ei) 76 return NULL; 77 return &ei->vfs_inode; 78 } 79 80 static void isofs_free_inode(struct inode *inode) 81 { 82 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); 83 } 84 85 static void init_once(void *foo) 86 { 87 struct iso_inode_info *ei = foo; 88 89 inode_init_once(&ei->vfs_inode); 90 } 91 92 static int __init init_inodecache(void) 93 { 94 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", 95 sizeof(struct iso_inode_info), 96 0, (SLAB_RECLAIM_ACCOUNT| 97 SLAB_ACCOUNT), 98 init_once); 99 if (!isofs_inode_cachep) 100 return -ENOMEM; 101 return 0; 102 } 103 104 static void destroy_inodecache(void) 105 { 106 /* 107 * Make sure all delayed rcu free inodes are flushed before we 108 * destroy cache. 109 */ 110 rcu_barrier(); 111 kmem_cache_destroy(isofs_inode_cachep); 112 } 113 114 static int isofs_reconfigure(struct fs_context *fc) 115 { 116 sync_filesystem(fc->root->d_sb); 117 if (!(fc->sb_flags & SB_RDONLY)) 118 return -EROFS; 119 return 0; 120 } 121 122 static const struct super_operations isofs_sops = { 123 .alloc_inode = isofs_alloc_inode, 124 .free_inode = isofs_free_inode, 125 .put_super = isofs_put_super, 126 .statfs = isofs_statfs, 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 isofs_options{ 149 unsigned int rock:1; 150 unsigned int joliet:1; 151 unsigned int cruft:1; 152 unsigned int hide:1; 153 unsigned int showassoc:1; 154 unsigned int nocompress:1; 155 unsigned int overriderockperm:1; 156 unsigned int uid_set:1; 157 unsigned int gid_set:1; 158 unsigned char map; 159 unsigned char check; 160 unsigned int blocksize; 161 umode_t fmode; 162 umode_t dmode; 163 kgid_t gid; 164 kuid_t uid; 165 char *iocharset; 166 /* LVE */ 167 s32 session; 168 s32 sbsector; 169 }; 170 171 /* 172 * Compute the hash for the isofs name corresponding to the dentry. 173 */ 174 static int 175 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) 176 { 177 const char *name; 178 int len; 179 char c; 180 unsigned long hash; 181 182 len = qstr->len; 183 name = qstr->name; 184 if (ms) { 185 while (len && name[len-1] == '.') 186 len--; 187 } 188 189 hash = init_name_hash(dentry); 190 while (len--) { 191 c = tolower(*name++); 192 hash = partial_name_hash(c, hash); 193 } 194 qstr->hash = end_name_hash(hash); 195 196 return 0; 197 } 198 199 /* 200 * Compare of two isofs names. 201 */ 202 static int isofs_dentry_cmp_common( 203 unsigned int len, const char *str, 204 const struct qstr *name, int ms, int ci) 205 { 206 int alen, blen; 207 208 /* A filename cannot end in '.' or we treat it like it has none */ 209 alen = name->len; 210 blen = len; 211 if (ms) { 212 while (alen && name->name[alen-1] == '.') 213 alen--; 214 while (blen && str[blen-1] == '.') 215 blen--; 216 } 217 if (alen == blen) { 218 if (ci) { 219 if (strncasecmp(name->name, str, alen) == 0) 220 return 0; 221 } else { 222 if (strncmp(name->name, str, alen) == 0) 223 return 0; 224 } 225 } 226 return 1; 227 } 228 229 static int 230 isofs_hashi(const struct dentry *dentry, struct qstr *qstr) 231 { 232 return isofs_hashi_common(dentry, qstr, 0); 233 } 234 235 static int 236 isofs_dentry_cmpi(const struct dentry *dentry, 237 unsigned int len, const char *str, const struct qstr *name) 238 { 239 return isofs_dentry_cmp_common(len, str, name, 0, 1); 240 } 241 242 #ifdef CONFIG_JOLIET 243 /* 244 * Compute the hash for the isofs name corresponding to the dentry. 245 */ 246 static int 247 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) 248 { 249 const char *name; 250 int len; 251 252 len = qstr->len; 253 name = qstr->name; 254 if (ms) { 255 while (len && name[len-1] == '.') 256 len--; 257 } 258 259 qstr->hash = full_name_hash(dentry, name, len); 260 261 return 0; 262 } 263 264 static int 265 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) 266 { 267 return isofs_hash_common(dentry, qstr, 1); 268 } 269 270 static int 271 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) 272 { 273 return isofs_hashi_common(dentry, qstr, 1); 274 } 275 276 static int 277 isofs_dentry_cmp_ms(const struct dentry *dentry, 278 unsigned int len, const char *str, const struct qstr *name) 279 { 280 return isofs_dentry_cmp_common(len, str, name, 1, 0); 281 } 282 283 static int 284 isofs_dentry_cmpi_ms(const struct dentry *dentry, 285 unsigned int len, const char *str, const struct qstr *name) 286 { 287 return isofs_dentry_cmp_common(len, str, name, 1, 1); 288 } 289 #endif 290 291 enum { 292 Opt_block, Opt_check, Opt_cruft, Opt_gid, Opt_ignore, Opt_iocharset, 293 Opt_map, Opt_mode, Opt_nojoliet, Opt_norock, Opt_sb, Opt_session, 294 Opt_uid, Opt_unhide, Opt_utf8, Opt_err, Opt_nocompress, Opt_hide, 295 Opt_showassoc, Opt_dmode, Opt_overriderockperm, 296 }; 297 298 static const struct constant_table isofs_param_map[] = { 299 {"acorn", 'a'}, 300 {"a", 'a'}, 301 {"normal", 'n'}, 302 {"n", 'n'}, 303 {"off", 'o'}, 304 {"o", 'o'}, 305 {} 306 }; 307 308 static const struct constant_table isofs_param_check[] = { 309 {"relaxed", 'r'}, 310 {"r", 'r'}, 311 {"strict", 's'}, 312 {"s", 's'}, 313 {} 314 }; 315 316 static const struct fs_parameter_spec isofs_param_spec[] = { 317 fsparam_flag ("norock", Opt_norock), 318 fsparam_flag ("nojoliet", Opt_nojoliet), 319 fsparam_flag ("unhide", Opt_unhide), 320 fsparam_flag ("hide", Opt_hide), 321 fsparam_flag ("showassoc", Opt_showassoc), 322 fsparam_flag ("cruft", Opt_cruft), 323 fsparam_flag ("utf8", Opt_utf8), 324 fsparam_string ("iocharset", Opt_iocharset), 325 fsparam_enum ("map", Opt_map, isofs_param_map), 326 fsparam_u32 ("session", Opt_session), 327 fsparam_u32 ("sbsector", Opt_sb), 328 fsparam_enum ("check", Opt_check, isofs_param_check), 329 fsparam_uid ("uid", Opt_uid), 330 fsparam_gid ("gid", Opt_gid), 331 /* Note: mode/dmode historically accepted %u not strictly %o */ 332 fsparam_u32 ("mode", Opt_mode), 333 fsparam_u32 ("dmode", Opt_dmode), 334 fsparam_flag ("overriderockperm", Opt_overriderockperm), 335 fsparam_u32 ("block", Opt_block), 336 fsparam_string ("conv", Opt_ignore), 337 fsparam_flag ("nocompress", Opt_nocompress), 338 {} 339 }; 340 341 static int isofs_parse_param(struct fs_context *fc, 342 struct fs_parameter *param) 343 { 344 struct isofs_options *popt = fc->fs_private; 345 struct fs_parse_result result; 346 int opt; 347 unsigned int n; 348 349 /* There are no remountable options */ 350 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) 351 return 0; 352 353 opt = fs_parse(fc, isofs_param_spec, param, &result); 354 if (opt < 0) 355 return opt; 356 357 switch (opt) { 358 case Opt_norock: 359 popt->rock = 0; 360 break; 361 case Opt_nojoliet: 362 popt->joliet = 0; 363 break; 364 case Opt_hide: 365 popt->hide = 1; 366 break; 367 case Opt_unhide: 368 case Opt_showassoc: 369 popt->showassoc = 1; 370 break; 371 case Opt_cruft: 372 popt->cruft = 1; 373 break; 374 #ifdef CONFIG_JOLIET 375 case Opt_utf8: 376 kfree(popt->iocharset); 377 popt->iocharset = kstrdup("utf8", GFP_KERNEL); 378 if (!popt->iocharset) 379 return -ENOMEM; 380 break; 381 case Opt_iocharset: 382 kfree(popt->iocharset); 383 popt->iocharset = kstrdup(param->string, GFP_KERNEL); 384 if (!popt->iocharset) 385 return -ENOMEM; 386 break; 387 #endif 388 case Opt_map: 389 popt->map = result.uint_32; 390 break; 391 case Opt_session: 392 n = result.uint_32; 393 /* 394 * Track numbers are supposed to be in range 1-99, the 395 * mount option starts indexing at 0. 396 */ 397 if (n >= 99) 398 return -EINVAL; 399 popt->session = n + 1; 400 break; 401 case Opt_sb: 402 popt->sbsector = result.uint_32; 403 break; 404 case Opt_check: 405 popt->check = result.uint_32; 406 break; 407 case Opt_ignore: 408 break; 409 case Opt_uid: 410 popt->uid = result.uid; 411 popt->uid_set = 1; 412 break; 413 case Opt_gid: 414 popt->gid = result.gid; 415 popt->gid_set = 1; 416 break; 417 case Opt_mode: 418 popt->fmode = result.uint_32; 419 break; 420 case Opt_dmode: 421 popt->dmode = result.uint_32; 422 break; 423 case Opt_overriderockperm: 424 popt->overriderockperm = 1; 425 break; 426 case Opt_block: 427 n = result.uint_32; 428 if (n != 512 && n != 1024 && n != 2048) 429 return -EINVAL; 430 popt->blocksize = n; 431 break; 432 case Opt_nocompress: 433 popt->nocompress = 1; 434 break; 435 default: 436 return -EINVAL; 437 } 438 return 0; 439 } 440 441 /* 442 * Display the mount options in /proc/mounts. 443 */ 444 static int isofs_show_options(struct seq_file *m, struct dentry *root) 445 { 446 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb); 447 448 if (!sbi->s_rock) seq_puts(m, ",norock"); 449 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet"); 450 if (sbi->s_cruft) seq_puts(m, ",cruft"); 451 if (sbi->s_hide) seq_puts(m, ",hide"); 452 if (sbi->s_nocompress) seq_puts(m, ",nocompress"); 453 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm"); 454 if (sbi->s_showassoc) seq_puts(m, ",showassoc"); 455 456 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check); 457 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping); 458 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1); 459 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector); 460 461 if (root->d_sb->s_blocksize != 1024) 462 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize); 463 464 if (sbi->s_uid_set) 465 seq_printf(m, ",uid=%u", 466 from_kuid_munged(&init_user_ns, sbi->s_uid)); 467 if (sbi->s_gid_set) 468 seq_printf(m, ",gid=%u", 469 from_kgid_munged(&init_user_ns, sbi->s_gid)); 470 471 if (sbi->s_dmode != ISOFS_INVALID_MODE) 472 seq_printf(m, ",dmode=%o", sbi->s_dmode); 473 if (sbi->s_fmode != ISOFS_INVALID_MODE) 474 seq_printf(m, ",fmode=%o", sbi->s_fmode); 475 476 #ifdef CONFIG_JOLIET 477 if (sbi->s_nls_iocharset) 478 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset); 479 else 480 seq_puts(m, ",iocharset=utf8"); 481 #endif 482 return 0; 483 } 484 485 /* 486 * look if the driver can tell the multi session redirection value 487 * 488 * don't change this if you don't know what you do, please! 489 * Multisession is legal only with XA disks. 490 * A non-XA disk with more than one volume descriptor may do it right, but 491 * usually is written in a nowhere standardized "multi-partition" manner. 492 * Multisession uses absolute addressing (solely the first frame of the whole 493 * track is #0), multi-partition uses relative addressing (each first frame of 494 * each track is #0), and a track is not a session. 495 * 496 * A broken CDwriter software or drive firmware does not set new standards, 497 * at least not if conflicting with the existing ones. 498 * 499 * emoenke@gwdg.de 500 */ 501 #define WE_OBEY_THE_WRITTEN_STANDARDS 1 502 503 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) 504 { 505 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); 506 unsigned int vol_desc_start = 0; 507 508 if (session > 0) { 509 struct cdrom_tocentry te; 510 511 if (!cdi) 512 return 0; 513 514 te.cdte_track = session; 515 te.cdte_format = CDROM_LBA; 516 if (cdrom_read_tocentry(cdi, &te) == 0) { 517 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", 518 session, te.cdte_addr.lba, 519 te.cdte_ctrl & CDROM_DATA_TRACK); 520 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4) 521 return te.cdte_addr.lba; 522 } 523 524 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); 525 } 526 527 if (cdi) { 528 struct cdrom_multisession ms_info; 529 530 ms_info.addr_format = CDROM_LBA; 531 if (cdrom_multisession(cdi, &ms_info) == 0) { 532 #if WE_OBEY_THE_WRITTEN_STANDARDS 533 /* necessary for a valid ms_info.addr */ 534 if (ms_info.xa_flag) 535 #endif 536 vol_desc_start = ms_info.addr.lba; 537 } 538 } 539 540 return vol_desc_start; 541 } 542 543 /* 544 * Check if root directory is empty (has less than 3 files). 545 * 546 * Used to detect broken CDs where ISO root directory is empty but Joliet root 547 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled 548 * (and Joliet used instead) or else no files would be visible. 549 */ 550 static bool rootdir_empty(struct super_block *sb, unsigned long block) 551 { 552 int offset = 0, files = 0, de_len; 553 struct iso_directory_record *de; 554 struct buffer_head *bh; 555 556 bh = sb_bread(sb, block); 557 if (!bh) 558 return true; 559 while (files < 3) { 560 de = (struct iso_directory_record *) (bh->b_data + offset); 561 de_len = *(unsigned char *) de; 562 if (de_len == 0) 563 break; 564 files++; 565 offset += de_len; 566 } 567 brelse(bh); 568 return files < 3; 569 } 570 571 /* 572 * Initialize the superblock and read the root inode. 573 */ 574 static int isofs_fill_super(struct super_block *s, struct fs_context *fc) 575 { 576 struct buffer_head *bh = NULL, *pri_bh = NULL; 577 struct hs_primary_descriptor *h_pri = NULL; 578 struct iso_primary_descriptor *pri = NULL; 579 struct iso_supplementary_descriptor *sec = NULL; 580 struct iso_directory_record *rootp; 581 struct inode *inode; 582 struct isofs_options *opt = fc->fs_private; 583 struct isofs_sb_info *sbi; 584 unsigned long first_data_zone; 585 int joliet_level = 0; 586 int iso_blknum, block; 587 int orig_zonesize; 588 int table, error = -EINVAL; 589 unsigned int vol_desc_start; 590 int silent = fc->sb_flags & SB_SILENT; 591 592 sbi = kzalloc_obj(*sbi); 593 if (!sbi) 594 return -ENOMEM; 595 s->s_fs_info = sbi; 596 597 /* 598 * First of all, get the hardware blocksize for this device. 599 * If we don't know what it is, or the hardware blocksize is 600 * larger than the blocksize the user specified, then use 601 * that value. 602 */ 603 /* 604 * What if bugger tells us to go beyond page size? 605 */ 606 if (bdev_logical_block_size(s->s_bdev) > 2048) { 607 printk(KERN_WARNING 608 "ISOFS: unsupported/invalid hardware sector size %d\n", 609 bdev_logical_block_size(s->s_bdev)); 610 goto out_freesbi; 611 } 612 opt->blocksize = sb_min_blocksize(s, opt->blocksize); 613 if (!opt->blocksize) { 614 printk(KERN_ERR 615 "ISOFS: unable to set blocksize\n"); 616 goto out_freesbi; 617 } 618 619 sbi->s_high_sierra = 0; /* default is iso9660 */ 620 sbi->s_session = opt->session; 621 sbi->s_sbsector = opt->sbsector; 622 623 vol_desc_start = (opt->sbsector != -1) ? 624 opt->sbsector : isofs_get_last_session(s, opt->session); 625 626 for (iso_blknum = vol_desc_start+16; 627 iso_blknum < vol_desc_start+100; iso_blknum++) { 628 struct hs_volume_descriptor *hdp; 629 struct iso_volume_descriptor *vdp; 630 631 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 632 if (!(bh = sb_bread(s, block))) 633 goto out_no_read; 634 635 vdp = (struct iso_volume_descriptor *)bh->b_data; 636 hdp = (struct hs_volume_descriptor *)bh->b_data; 637 638 /* 639 * Due to the overlapping physical location of the descriptors, 640 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure 641 * proper identification in this case, we first check for ISO. 642 */ 643 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { 644 if (isonum_711(vdp->type) == ISO_VD_END) 645 break; 646 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { 647 if (!pri) { 648 pri = (struct iso_primary_descriptor *)vdp; 649 /* Save the buffer in case we need it ... */ 650 pri_bh = bh; 651 bh = NULL; 652 } 653 } 654 #ifdef CONFIG_JOLIET 655 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { 656 sec = (struct iso_supplementary_descriptor *)vdp; 657 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { 658 if (opt->joliet) { 659 if (sec->escape[2] == 0x40) 660 joliet_level = 1; 661 else if (sec->escape[2] == 0x43) 662 joliet_level = 2; 663 else if (sec->escape[2] == 0x45) 664 joliet_level = 3; 665 666 printk(KERN_DEBUG "ISO 9660 Extensions: " 667 "Microsoft Joliet Level %d\n", 668 joliet_level); 669 } 670 goto root_found; 671 } else { 672 /* Unknown supplementary volume descriptor */ 673 sec = NULL; 674 } 675 } 676 #endif 677 } else { 678 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { 679 if (isonum_711(hdp->type) != ISO_VD_PRIMARY) 680 goto out_freebh; 681 682 sbi->s_high_sierra = 1; 683 opt->rock = 0; 684 h_pri = (struct hs_primary_descriptor *)vdp; 685 goto root_found; 686 } 687 } 688 689 /* Just skip any volume descriptors we don't recognize */ 690 691 brelse(bh); 692 bh = NULL; 693 } 694 /* 695 * If we fall through, either no volume descriptor was found, 696 * or else we passed a primary descriptor looking for others. 697 */ 698 if (!pri) 699 goto out_unknown_format; 700 brelse(bh); 701 bh = pri_bh; 702 pri_bh = NULL; 703 704 root_found: 705 /* We don't support read-write mounts */ 706 if (!sb_rdonly(s)) { 707 error = -EACCES; 708 goto out_freebh; 709 } 710 711 if (joliet_level && (!pri || !opt->rock)) { 712 /* This is the case of Joliet with the norock mount flag. 713 * A disc with both Joliet and Rock Ridge is handled later 714 */ 715 pri = (struct iso_primary_descriptor *) sec; 716 } 717 718 if(sbi->s_high_sierra){ 719 rootp = (struct iso_directory_record *) h_pri->root_directory_record; 720 sbi->s_nzones = isonum_733(h_pri->volume_space_size); 721 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); 722 sbi->s_max_size = isonum_733(h_pri->volume_space_size); 723 } else { 724 if (!pri) 725 goto out_freebh; 726 rootp = (struct iso_directory_record *) pri->root_directory_record; 727 sbi->s_nzones = isonum_733(pri->volume_space_size); 728 sbi->s_log_zone_size = isonum_723(pri->logical_block_size); 729 sbi->s_max_size = isonum_733(pri->volume_space_size); 730 } 731 732 sbi->s_ninodes = 0; /* No way to figure this out easily */ 733 734 orig_zonesize = sbi->s_log_zone_size; 735 /* 736 * If the zone size is smaller than the hardware sector size, 737 * this is a fatal error. This would occur if the disc drive 738 * had sectors that were 2048 bytes, but the filesystem had 739 * blocks that were 512 bytes (which should only very rarely 740 * happen.) 741 */ 742 if (orig_zonesize < opt->blocksize) 743 goto out_bad_size; 744 745 /* RDE: convert log zone size to bit shift */ 746 switch (sbi->s_log_zone_size) { 747 case 512: sbi->s_log_zone_size = 9; break; 748 case 1024: sbi->s_log_zone_size = 10; break; 749 case 2048: sbi->s_log_zone_size = 11; break; 750 751 default: 752 goto out_bad_zone_size; 753 } 754 755 s->s_magic = ISOFS_SUPER_MAGIC; 756 757 /* 758 * With multi-extent files, file size is only limited by the maximum 759 * size of a file system, which is 8 TB. 760 */ 761 s->s_maxbytes = 0x80000000000LL; 762 763 /* ECMA-119 timestamp from 1900/1/1 with tz offset */ 764 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET; 765 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET; 766 767 /* Set this for reference. Its not currently used except on write 768 which we don't have .. */ 769 770 first_data_zone = isonum_733(rootp->extent) + 771 isonum_711(rootp->ext_attr_length); 772 sbi->s_firstdatazone = first_data_zone; 773 #ifndef BEQUIET 774 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", 775 sbi->s_max_size, 1UL << sbi->s_log_zone_size); 776 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); 777 if(sbi->s_high_sierra) 778 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); 779 #endif 780 781 /* 782 * If the Joliet level is set, we _may_ decide to use the 783 * secondary descriptor, but can't be sure until after we 784 * read the root inode. But before reading the root inode 785 * we may need to change the device blocksize, and would 786 * rather release the old buffer first. So, we cache the 787 * first_data_zone value from the secondary descriptor. 788 */ 789 if (joliet_level) { 790 pri = (struct iso_primary_descriptor *) sec; 791 rootp = (struct iso_directory_record *) 792 pri->root_directory_record; 793 first_data_zone = isonum_733(rootp->extent) + 794 isonum_711(rootp->ext_attr_length); 795 } 796 797 /* 798 * We're all done using the volume descriptor, and may need 799 * to change the device blocksize, so release the buffer now. 800 */ 801 brelse(pri_bh); 802 brelse(bh); 803 804 /* 805 * Force the blocksize to 512 for 512 byte sectors. The file 806 * read primitives really get it wrong in a bad way if we don't 807 * do this. 808 * 809 * Note - we should never be setting the blocksize to something 810 * less than the hardware sector size for the device. If we 811 * do, we would end up having to read larger buffers and split 812 * out portions to satisfy requests. 813 * 814 * Note2- the idea here is that we want to deal with the optimal 815 * zonesize in the filesystem. If we have it set to something less, 816 * then we have horrible problems with trying to piece together 817 * bits of adjacent blocks in order to properly read directory 818 * entries. By forcing the blocksize in this way, we ensure 819 * that we will never be required to do this. 820 */ 821 if (!sb_set_blocksize(s, orig_zonesize)) 822 goto out_freesbi; 823 824 sbi->s_session_start = (sector_t)vol_desc_start << 825 (ISOFS_BLOCK_BITS - s->s_blocksize_bits); 826 sbi->s_nls_iocharset = NULL; 827 828 #ifdef CONFIG_JOLIET 829 if (joliet_level) { 830 char *p = opt->iocharset ? opt->iocharset : CONFIG_NLS_DEFAULT; 831 if (strcmp(p, "utf8") != 0) { 832 sbi->s_nls_iocharset = opt->iocharset ? 833 load_nls(opt->iocharset) : load_nls_default(); 834 if (!sbi->s_nls_iocharset) 835 goto out_freesbi; 836 } 837 } 838 #endif 839 s->s_op = &isofs_sops; 840 s->s_export_op = &isofs_export_ops; 841 sbi->s_mapping = opt->map; 842 sbi->s_rock = (opt->rock ? 2 : 0); 843 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ 844 sbi->s_cruft = opt->cruft; 845 sbi->s_hide = opt->hide; 846 sbi->s_showassoc = opt->showassoc; 847 sbi->s_uid = opt->uid; 848 sbi->s_gid = opt->gid; 849 sbi->s_uid_set = opt->uid_set; 850 sbi->s_gid_set = opt->gid_set; 851 sbi->s_nocompress = opt->nocompress; 852 sbi->s_overriderockperm = opt->overriderockperm; 853 /* 854 * It would be incredibly stupid to allow people to mark every file 855 * on the disk as suid, so we merely allow them to set the default 856 * permissions. 857 */ 858 if (opt->fmode != ISOFS_INVALID_MODE) 859 sbi->s_fmode = opt->fmode & 0777; 860 else 861 sbi->s_fmode = ISOFS_INVALID_MODE; 862 if (opt->dmode != ISOFS_INVALID_MODE) 863 sbi->s_dmode = opt->dmode & 0777; 864 else 865 sbi->s_dmode = ISOFS_INVALID_MODE; 866 867 /* 868 * Read the root inode, which _may_ result in changing 869 * the s_rock flag. Once we have the final s_rock value, 870 * we then decide whether to use the Joliet descriptor. 871 */ 872 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 873 874 /* 875 * Fix for broken CDs with a corrupt root inode but a correct Joliet 876 * root directory. 877 */ 878 if (IS_ERR(inode)) { 879 if (joliet_level && sbi->s_firstdatazone != first_data_zone) { 880 printk(KERN_NOTICE 881 "ISOFS: root inode is unusable. " 882 "Disabling Rock Ridge and switching to Joliet."); 883 sbi->s_rock = 0; 884 inode = NULL; 885 } else { 886 goto out_no_root; 887 } 888 } 889 890 /* 891 * Fix for broken CDs with Rock Ridge and empty ISO root directory but 892 * correct Joliet root directory. 893 */ 894 if (sbi->s_rock == 1 && joliet_level && 895 rootdir_empty(s, sbi->s_firstdatazone)) { 896 printk(KERN_NOTICE 897 "ISOFS: primary root directory is empty. " 898 "Disabling Rock Ridge and switching to Joliet."); 899 sbi->s_rock = 0; 900 } 901 902 /* 903 * If this disk has both Rock Ridge and Joliet on it, then we 904 * want to use Rock Ridge by default. This can be overridden 905 * by using the norock mount option. There is still one other 906 * possibility that is not taken into account: a Rock Ridge 907 * CD with Unicode names. Until someone sees such a beast, it 908 * will not be supported. 909 */ 910 if (sbi->s_rock == 1) { 911 joliet_level = 0; 912 } else if (joliet_level) { 913 sbi->s_rock = 0; 914 if (sbi->s_firstdatazone != first_data_zone) { 915 sbi->s_firstdatazone = first_data_zone; 916 printk(KERN_DEBUG 917 "ISOFS: changing to secondary root\n"); 918 iput(inode); 919 inode = isofs_iget(s, sbi->s_firstdatazone, 0); 920 if (IS_ERR(inode)) 921 goto out_no_root; 922 } 923 } 924 925 if (opt->check == 'u') { 926 /* Only Joliet is case insensitive by default */ 927 if (joliet_level) 928 opt->check = 'r'; 929 else 930 opt->check = 's'; 931 } 932 sbi->s_joliet_level = joliet_level; 933 934 /* Make sure the root inode is a directory */ 935 if (!S_ISDIR(inode->i_mode)) { 936 printk(KERN_WARNING 937 "isofs_fill_super: root inode is not a directory. " 938 "Corrupted media?\n"); 939 goto out_iput; 940 } 941 942 table = 0; 943 if (joliet_level) 944 table += 2; 945 if (opt->check == 'r') 946 table++; 947 sbi->s_check = opt->check; 948 949 if (table) 950 set_default_d_op(s, &isofs_dentry_ops[table - 1]); 951 952 /* get the root dentry */ 953 s->s_root = d_make_root(inode); 954 if (!(s->s_root)) { 955 error = -ENOMEM; 956 goto out_no_inode; 957 } 958 959 return 0; 960 961 /* 962 * Display error messages and free resources. 963 */ 964 out_iput: 965 iput(inode); 966 goto out_no_inode; 967 out_no_root: 968 error = PTR_ERR(inode); 969 if (error != -ENOMEM) 970 printk(KERN_WARNING "%s: get root inode failed\n", __func__); 971 out_no_inode: 972 #ifdef CONFIG_JOLIET 973 unload_nls(sbi->s_nls_iocharset); 974 #endif 975 goto out_freesbi; 976 out_no_read: 977 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", 978 __func__, s->s_id, iso_blknum, block); 979 goto out_freebh; 980 out_bad_zone_size: 981 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", 982 sbi->s_log_zone_size); 983 goto out_freebh; 984 out_bad_size: 985 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", 986 orig_zonesize, opt->blocksize); 987 goto out_freebh; 988 out_unknown_format: 989 if (!silent) 990 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); 991 992 out_freebh: 993 brelse(bh); 994 brelse(pri_bh); 995 out_freesbi: 996 kfree(sbi); 997 s->s_fs_info = NULL; 998 return error; 999 } 1000 1001 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) 1002 { 1003 struct super_block *sb = dentry->d_sb; 1004 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 1005 1006 buf->f_type = ISOFS_SUPER_MAGIC; 1007 buf->f_bsize = sb->s_blocksize; 1008 buf->f_blocks = (ISOFS_SB(sb)->s_nzones 1009 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); 1010 buf->f_bfree = 0; 1011 buf->f_bavail = 0; 1012 buf->f_files = ISOFS_SB(sb)->s_ninodes; 1013 buf->f_ffree = 0; 1014 buf->f_fsid = u64_to_fsid(id); 1015 buf->f_namelen = ISOFS_SB(sb)->s_joliet_level ? 1016 JOLIET_NAME_MAX : NAME_MAX; 1017 return 0; 1018 } 1019 1020 /* 1021 * Get a set of blocks; filling in buffer_heads if already allocated 1022 * or getblk() if they are not. Returns the number of blocks inserted 1023 * (-ve == error.) 1024 */ 1025 int isofs_get_blocks(struct inode *inode, sector_t iblock, 1026 struct buffer_head **bh, unsigned long nblocks) 1027 { 1028 unsigned long b_off = iblock; 1029 unsigned offset, sect_size; 1030 unsigned int firstext; 1031 unsigned long nextblk, nextoff; 1032 int section, rv, error; 1033 struct iso_inode_info *ei = ISOFS_I(inode); 1034 1035 error = -EIO; 1036 rv = 0; 1037 if (iblock != b_off) { 1038 printk(KERN_DEBUG "%s: block number too large\n", __func__); 1039 goto abort; 1040 } 1041 1042 1043 offset = 0; 1044 firstext = ei->i_first_extent; 1045 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); 1046 nextblk = ei->i_next_section_block; 1047 nextoff = ei->i_next_section_offset; 1048 section = 0; 1049 1050 while (nblocks) { 1051 /* If we are *way* beyond the end of the file, print a message. 1052 * Access beyond the end of the file up to the next page boundary 1053 * is normal, however because of the way the page cache works. 1054 * In this case, we just return 0 so that we can properly fill 1055 * the page with useless information without generating any 1056 * I/O errors. 1057 */ 1058 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { 1059 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n", 1060 __func__, b_off, 1061 (unsigned long long)inode->i_size); 1062 goto abort; 1063 } 1064 1065 /* On the last section, nextblk == 0, section size is likely to 1066 * exceed sect_size by a partial block, and access beyond the 1067 * end of the file will reach beyond the section size, too. 1068 */ 1069 while (nextblk && (b_off >= (offset + sect_size))) { 1070 struct inode *ninode; 1071 1072 offset += sect_size; 1073 ninode = isofs_iget(inode->i_sb, nextblk, nextoff); 1074 if (IS_ERR(ninode)) { 1075 error = PTR_ERR(ninode); 1076 goto abort; 1077 } 1078 firstext = ISOFS_I(ninode)->i_first_extent; 1079 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); 1080 nextblk = ISOFS_I(ninode)->i_next_section_block; 1081 nextoff = ISOFS_I(ninode)->i_next_section_offset; 1082 iput(ninode); 1083 1084 if (++section > 100) { 1085 printk(KERN_DEBUG "%s: More than 100 file sections ?!?" 1086 " aborting...\n", __func__); 1087 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " 1088 "nextblk=%lu nextoff=%lu\n", __func__, 1089 b_off, firstext, (unsigned) sect_size, 1090 nextblk, nextoff); 1091 goto abort; 1092 } 1093 } 1094 1095 if (*bh) { 1096 map_bh(*bh, inode->i_sb, firstext + b_off - offset); 1097 } else { 1098 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); 1099 if (!*bh) 1100 goto abort; 1101 } 1102 bh++; /* Next buffer head */ 1103 b_off++; /* Next buffer offset */ 1104 nblocks--; 1105 rv++; 1106 } 1107 1108 error = 0; 1109 abort: 1110 return rv != 0 ? rv : error; 1111 } 1112 1113 /* 1114 * Used by the standard interfaces. 1115 */ 1116 static int isofs_get_block(struct inode *inode, sector_t iblock, 1117 struct buffer_head *bh_result, int create) 1118 { 1119 int ret; 1120 1121 if (create) { 1122 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); 1123 return -EROFS; 1124 } 1125 1126 ret = isofs_get_blocks(inode, iblock, &bh_result, 1); 1127 return ret < 0 ? ret : 0; 1128 } 1129 1130 static int isofs_bmap(struct inode *inode, sector_t block) 1131 { 1132 struct buffer_head dummy; 1133 int error; 1134 1135 dummy.b_state = 0; 1136 dummy.b_blocknr = -1000; 1137 error = isofs_get_block(inode, block, &dummy, 0); 1138 if (!error) 1139 return dummy.b_blocknr; 1140 return 0; 1141 } 1142 1143 struct buffer_head *isofs_bread(struct inode *inode, sector_t block) 1144 { 1145 sector_t blknr = isofs_bmap(inode, block); 1146 if (!blknr) 1147 return NULL; 1148 return sb_bread(inode->i_sb, blknr); 1149 } 1150 1151 static int isofs_read_folio(struct file *file, struct folio *folio) 1152 { 1153 return mpage_read_folio(folio, isofs_get_block); 1154 } 1155 1156 static void isofs_readahead(struct readahead_control *rac) 1157 { 1158 mpage_readahead(rac, isofs_get_block); 1159 } 1160 1161 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) 1162 { 1163 return generic_block_bmap(mapping,block,isofs_get_block); 1164 } 1165 1166 static const struct address_space_operations isofs_aops = { 1167 .read_folio = isofs_read_folio, 1168 .readahead = isofs_readahead, 1169 .bmap = _isofs_bmap 1170 }; 1171 1172 static int isofs_read_level3_size(struct inode *inode) 1173 { 1174 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1175 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; 1176 struct buffer_head *bh = NULL; 1177 unsigned long block, offset; 1178 int i = 0; 1179 int more_entries = 0; 1180 struct iso_inode_info *ei = ISOFS_I(inode); 1181 1182 inode->i_size = 0; 1183 1184 /* The first 16 blocks are reserved as the System Area. Thus, 1185 * no inodes can appear in block 0. We use this to flag that 1186 * this is the last section. */ 1187 ei->i_next_section_block = 0; 1188 ei->i_next_section_offset = 0; 1189 1190 block = ei->i_iget5_block; 1191 offset = ei->i_iget5_offset; 1192 1193 do { 1194 struct iso_directory_record *de; 1195 unsigned int de_len; 1196 1197 if (!bh) { 1198 bh = sb_bread(inode->i_sb, block); 1199 if (!bh) 1200 goto out_noread; 1201 } 1202 de = (struct iso_directory_record *) (bh->b_data + offset); 1203 1204 /* 1205 * If we are at the end of a block (or at its zero-padded 1206 * tail), move on to the next block. A zero length byte at 1207 * the start of a block means the whole block is empty; 1208 * count that towards the same limit as sections below, or a 1209 * chain of empty blocks could be walked without bound. 1210 */ 1211 if (offset >= bufsize || de->length[0] == 0) { 1212 if (offset == 0 && ++i > 100) 1213 goto out_toomany; 1214 brelse(bh); 1215 bh = NULL; 1216 ++block; 1217 offset = 0; 1218 continue; 1219 } 1220 1221 if (!isofs_dir_record_valid(de, offset, bufsize)) { 1222 printk(KERN_NOTICE "iso9660: Corrupted directory entry in block %lu of inode %llu\n", 1223 block, inode->i_ino); 1224 brelse(bh); 1225 return -EIO; 1226 } 1227 1228 /* Save the first continuation directory entry in the inode */ 1229 if (more_entries && !ei->i_next_section_block) { 1230 ei->i_next_section_block = block; 1231 ei->i_next_section_offset = offset; 1232 } 1233 de_len = de->length[0]; 1234 offset += de_len; 1235 inode->i_size += isonum_733(de->size); 1236 more_entries = de->flags[-high_sierra] & 0x80; 1237 1238 if (++i > 100) 1239 goto out_toomany; 1240 } while (more_entries); 1241 out: 1242 brelse(bh); 1243 return 0; 1244 1245 out_noread: 1246 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); 1247 return -EIO; 1248 1249 out_toomany: 1250 printk(KERN_INFO "%s: More than 100 file sections/empty blocks ?!?, aborting...\n" 1251 "isofs_read_level3_size: inode=%llu\n", 1252 __func__, inode->i_ino); 1253 goto out; 1254 } 1255 1256 static int isofs_read_inode(struct inode *inode, int relocated) 1257 { 1258 struct super_block *sb = inode->i_sb; 1259 struct isofs_sb_info *sbi = ISOFS_SB(sb); 1260 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); 1261 unsigned long block; 1262 int high_sierra = sbi->s_high_sierra; 1263 struct buffer_head *bh; 1264 struct iso_directory_record *de; 1265 struct iso_directory_record *tmpde = NULL; 1266 unsigned int de_len; 1267 unsigned long offset; 1268 struct iso_inode_info *ei = ISOFS_I(inode); 1269 int ret = -EIO; 1270 struct timespec64 ts; 1271 1272 block = ei->i_iget5_block; 1273 bh = sb_bread(inode->i_sb, block); 1274 if (!bh) 1275 goto out_badread; 1276 1277 offset = ei->i_iget5_offset; 1278 1279 de = (struct iso_directory_record *) (bh->b_data + offset); 1280 de_len = *(unsigned char *) de; 1281 if (de_len < sizeof(struct iso_directory_record)) 1282 goto fail; 1283 1284 if (offset + de_len > bufsize) { 1285 int frag1 = bufsize - offset; 1286 1287 tmpde = kmalloc(de_len, GFP_KERNEL); 1288 if (!tmpde) { 1289 ret = -ENOMEM; 1290 goto fail; 1291 } 1292 memcpy(tmpde, bh->b_data + offset, frag1); 1293 brelse(bh); 1294 bh = sb_bread(inode->i_sb, ++block); 1295 if (!bh) 1296 goto out_badread; 1297 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); 1298 de = tmpde; 1299 } 1300 1301 inode->i_ino = isofs_get_ino(ei->i_iget5_block, 1302 ei->i_iget5_offset, 1303 ISOFS_BUFFER_BITS(inode)); 1304 1305 /* Assume it is a normal-format file unless told otherwise */ 1306 ei->i_file_format = isofs_file_normal; 1307 1308 if (de->flags[-high_sierra] & 2) { 1309 if (sbi->s_dmode != ISOFS_INVALID_MODE) 1310 inode->i_mode = S_IFDIR | sbi->s_dmode; 1311 else 1312 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 1313 set_nlink(inode, 1); /* 1314 * Set to 1. We know there are 2, but 1315 * the find utility tries to optimize 1316 * if it is 2, and it screws up. It is 1317 * easier to give 1 which tells find to 1318 * do it the hard way. 1319 */ 1320 } else { 1321 if (sbi->s_fmode != ISOFS_INVALID_MODE) { 1322 inode->i_mode = S_IFREG | sbi->s_fmode; 1323 } else { 1324 /* 1325 * Set default permissions: r-x for all. The disc 1326 * could be shared with DOS machines so virtually 1327 * anything could be a valid executable. 1328 */ 1329 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; 1330 } 1331 set_nlink(inode, 1); 1332 } 1333 inode->i_uid = sbi->s_uid; 1334 inode->i_gid = sbi->s_gid; 1335 inode->i_blocks = 0; 1336 1337 ei->i_format_parm[0] = 0; 1338 ei->i_format_parm[1] = 0; 1339 ei->i_format_parm[2] = 0; 1340 1341 ei->i_section_size = isonum_733(de->size); 1342 if (de->flags[-high_sierra] & 0x80) { 1343 ret = isofs_read_level3_size(inode); 1344 if (ret < 0) 1345 goto fail; 1346 ret = -EIO; 1347 } else { 1348 ei->i_next_section_block = 0; 1349 ei->i_next_section_offset = 0; 1350 inode->i_size = isonum_733(de->size); 1351 } 1352 1353 /* 1354 * Some dipshit decided to store some other bit of information 1355 * in the high byte of the file length. Truncate size in case 1356 * this CDROM was mounted with the cruft option. 1357 */ 1358 1359 if (sbi->s_cruft) 1360 inode->i_size &= 0x00ffffff; 1361 1362 if (de->interleave[0]) { 1363 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); 1364 inode->i_size = 0; 1365 } 1366 1367 /* I have no idea what file_unit_size is used for, so 1368 we will flag it for now */ 1369 if (de->file_unit_size[0] != 0) { 1370 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%llu).\n", 1371 inode->i_ino); 1372 } 1373 1374 /* I have no idea what other flag bits are used for, so 1375 we will flag it for now */ 1376 #ifdef DEBUG 1377 if((de->flags[-high_sierra] & ~2)!= 0){ 1378 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " 1379 "(%llu %x).\n", 1380 inode->i_ino, de->flags[-high_sierra]); 1381 } 1382 #endif 1383 ts = iso_date(de->date, high_sierra ? ISO_DATE_HIGH_SIERRA : 0); 1384 inode_set_ctime_to_ts(inode, ts); 1385 inode_set_atime_to_ts(inode, ts); 1386 inode_set_mtime_to_ts(inode, ts); 1387 1388 ei->i_first_extent = (isonum_733(de->extent) + 1389 isonum_711(de->ext_attr_length)); 1390 1391 /* Set the number of blocks for stat() - should be done before RR */ 1392 inode->i_blocks = (inode->i_size + 511) >> 9; 1393 1394 /* 1395 * Now test for possible Rock Ridge extensions which will override 1396 * some of these numbers in the inode structure. 1397 */ 1398 1399 if (!high_sierra) { 1400 parse_rock_ridge_inode(de, inode, relocated); 1401 /* if we want uid/gid set, override the rock ridge setting */ 1402 if (sbi->s_uid_set) 1403 inode->i_uid = sbi->s_uid; 1404 if (sbi->s_gid_set) 1405 inode->i_gid = sbi->s_gid; 1406 } 1407 /* Now set final access rights if overriding rock ridge setting */ 1408 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && 1409 sbi->s_dmode != ISOFS_INVALID_MODE) 1410 inode->i_mode = S_IFDIR | sbi->s_dmode; 1411 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && 1412 sbi->s_fmode != ISOFS_INVALID_MODE) 1413 inode->i_mode = S_IFREG | sbi->s_fmode; 1414 1415 /* Install the inode operations vector */ 1416 if (S_ISREG(inode->i_mode)) { 1417 inode->i_fop = &generic_ro_fops; 1418 switch (ei->i_file_format) { 1419 #ifdef CONFIG_ZISOFS 1420 case isofs_file_compressed: 1421 inode->i_data.a_ops = &zisofs_aops; 1422 break; 1423 #endif 1424 default: 1425 inode->i_data.a_ops = &isofs_aops; 1426 break; 1427 } 1428 } else if (S_ISDIR(inode->i_mode)) { 1429 inode->i_op = &isofs_dir_inode_operations; 1430 inode->i_fop = &isofs_dir_operations; 1431 } else if (S_ISLNK(inode->i_mode)) { 1432 inode->i_op = &page_symlink_inode_operations; 1433 inode_nohighmem(inode); 1434 inode->i_data.a_ops = &isofs_symlink_aops; 1435 } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || 1436 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { 1437 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ 1438 init_special_inode(inode, inode->i_mode, inode->i_rdev); 1439 } else { 1440 printk(KERN_DEBUG "ISOFS: Invalid file type 0%04o for inode %llu.\n", 1441 inode->i_mode, inode->i_ino); 1442 ret = -EIO; 1443 goto fail; 1444 } 1445 1446 ret = 0; 1447 out: 1448 kfree(tmpde); 1449 brelse(bh); 1450 return ret; 1451 1452 out_badread: 1453 printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); 1454 fail: 1455 goto out; 1456 } 1457 1458 struct isofs_iget5_callback_data { 1459 unsigned long block; 1460 unsigned long offset; 1461 }; 1462 1463 static int isofs_iget5_test(struct inode *ino, void *data) 1464 { 1465 struct iso_inode_info *i = ISOFS_I(ino); 1466 struct isofs_iget5_callback_data *d = 1467 (struct isofs_iget5_callback_data*)data; 1468 return (i->i_iget5_block == d->block) 1469 && (i->i_iget5_offset == d->offset); 1470 } 1471 1472 static int isofs_iget5_set(struct inode *ino, void *data) 1473 { 1474 struct iso_inode_info *i = ISOFS_I(ino); 1475 struct isofs_iget5_callback_data *d = 1476 (struct isofs_iget5_callback_data*)data; 1477 i->i_iget5_block = d->block; 1478 i->i_iget5_offset = d->offset; 1479 return 0; 1480 } 1481 1482 /* Store, in the inode's containing structure, the block and block 1483 * offset that point to the underlying meta-data for the inode. The 1484 * code below is otherwise similar to the iget() code in 1485 * include/linux/fs.h */ 1486 struct inode *__isofs_iget(struct super_block *sb, 1487 unsigned long block, 1488 unsigned long offset, 1489 int relocated) 1490 { 1491 unsigned long hashval; 1492 struct inode *inode; 1493 struct isofs_iget5_callback_data data; 1494 long ret; 1495 1496 if (offset >= 1ul << sb->s_blocksize_bits) 1497 return ERR_PTR(-EINVAL); 1498 1499 data.block = block; 1500 data.offset = offset; 1501 1502 hashval = (block << sb->s_blocksize_bits) | offset; 1503 1504 inode = iget5_locked(sb, hashval, &isofs_iget5_test, 1505 &isofs_iget5_set, &data); 1506 1507 if (!inode) 1508 return ERR_PTR(-ENOMEM); 1509 1510 if (inode_state_read_once(inode) & I_NEW) { 1511 ret = isofs_read_inode(inode, relocated); 1512 if (ret < 0) { 1513 iget_failed(inode); 1514 inode = ERR_PTR(ret); 1515 } else { 1516 unlock_new_inode(inode); 1517 } 1518 } 1519 1520 return inode; 1521 } 1522 1523 static int isofs_get_tree(struct fs_context *fc) 1524 { 1525 return get_tree_bdev(fc, isofs_fill_super); 1526 } 1527 1528 static void isofs_free_fc(struct fs_context *fc) 1529 { 1530 struct isofs_options *opt = fc->fs_private; 1531 1532 kfree(opt->iocharset); 1533 kfree(opt); 1534 } 1535 1536 static const struct fs_context_operations isofs_context_ops = { 1537 .parse_param = isofs_parse_param, 1538 .get_tree = isofs_get_tree, 1539 .reconfigure = isofs_reconfigure, 1540 .free = isofs_free_fc, 1541 }; 1542 1543 static int isofs_init_fs_context(struct fs_context *fc) 1544 { 1545 struct isofs_options *opt; 1546 1547 opt = kzalloc_obj(*opt); 1548 if (!opt) 1549 return -ENOMEM; 1550 1551 opt->map = 'n'; 1552 opt->rock = 1; 1553 opt->joliet = 1; 1554 opt->cruft = 0; 1555 opt->hide = 0; 1556 opt->showassoc = 0; 1557 opt->check = 'u'; /* unset */ 1558 opt->nocompress = 0; 1559 opt->blocksize = 1024; 1560 opt->fmode = opt->dmode = ISOFS_INVALID_MODE; 1561 opt->uid_set = 0; 1562 opt->gid_set = 0; 1563 opt->gid = GLOBAL_ROOT_GID; 1564 opt->uid = GLOBAL_ROOT_UID; 1565 opt->iocharset = NULL; 1566 opt->overriderockperm = 0; 1567 opt->session = -1; 1568 opt->sbsector = -1; 1569 1570 fc->fs_private = opt; 1571 fc->ops = &isofs_context_ops; 1572 1573 return 0; 1574 } 1575 1576 static struct file_system_type iso9660_fs_type = { 1577 .owner = THIS_MODULE, 1578 .name = "iso9660", 1579 .kill_sb = kill_block_super, 1580 .fs_flags = FS_REQUIRES_DEV, 1581 .init_fs_context = isofs_init_fs_context, 1582 .parameters = isofs_param_spec, 1583 }; 1584 MODULE_ALIAS_FS("iso9660"); 1585 MODULE_ALIAS("iso9660"); 1586 1587 static int __init init_iso9660_fs(void) 1588 { 1589 int err = init_inodecache(); 1590 if (err) 1591 goto out; 1592 #ifdef CONFIG_ZISOFS 1593 err = zisofs_init(); 1594 if (err) 1595 goto out1; 1596 #endif 1597 err = register_filesystem(&iso9660_fs_type); 1598 if (err) 1599 goto out2; 1600 return 0; 1601 out2: 1602 #ifdef CONFIG_ZISOFS 1603 zisofs_cleanup(); 1604 out1: 1605 #endif 1606 destroy_inodecache(); 1607 out: 1608 return err; 1609 } 1610 1611 static void __exit exit_iso9660_fs(void) 1612 { 1613 unregister_filesystem(&iso9660_fs_type); 1614 #ifdef CONFIG_ZISOFS 1615 zisofs_cleanup(); 1616 #endif 1617 destroy_inodecache(); 1618 } 1619 1620 module_init(init_iso9660_fs) 1621 module_exit(exit_iso9660_fs) 1622 MODULE_DESCRIPTION("ISO 9660 CDROM file system support"); 1623 MODULE_LICENSE("GPL"); 1624