1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Squashfs - a compressed read only filesystem for Linux 4 * 5 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 6 * Phillip Lougher <phillip@squashfs.org.uk> 7 * 8 * super.c 9 */ 10 11 /* 12 * This file implements code to read the superblock, read and initialise 13 * in-memory structures at mount time, and all the VFS glue code to register 14 * the filesystem. 15 */ 16 17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 18 19 #include <linux/blkdev.h> 20 #include <linux/fs.h> 21 #include <linux/fs_context.h> 22 #include <linux/fs_parser.h> 23 #include <linux/vfs.h> 24 #include <linux/slab.h> 25 #include <linux/mutex.h> 26 #include <linux/seq_file.h> 27 #include <linux/pagemap.h> 28 #include <linux/init.h> 29 #include <linux/module.h> 30 #include <linux/magic.h> 31 #include <linux/xattr.h> 32 33 #include "squashfs_fs.h" 34 #include "squashfs_fs_sb.h" 35 #include "squashfs_fs_i.h" 36 #include "squashfs.h" 37 #include "decompressor.h" 38 #include "xattr.h" 39 40 static struct file_system_type squashfs_fs_type; 41 static const struct super_operations squashfs_super_ops; 42 43 enum Opt_errors { 44 Opt_errors_continue, 45 Opt_errors_panic, 46 }; 47 48 enum squashfs_param { 49 Opt_errors, 50 Opt_threads, 51 }; 52 53 struct squashfs_mount_opts { 54 enum Opt_errors errors; 55 const struct squashfs_decompressor_thread_ops *thread_ops; 56 int thread_num; 57 }; 58 59 static const struct constant_table squashfs_param_errors[] = { 60 {"continue", Opt_errors_continue }, 61 {"panic", Opt_errors_panic }, 62 {} 63 }; 64 65 static const struct fs_parameter_spec squashfs_fs_parameters[] = { 66 fsparam_enum("errors", Opt_errors, squashfs_param_errors), 67 fsparam_string("threads", Opt_threads), 68 {} 69 }; 70 71 72 static int squashfs_parse_param_threads_str(const char *str, struct squashfs_mount_opts *opts) 73 { 74 #ifdef CONFIG_SQUASHFS_CHOICE_DECOMP_BY_MOUNT 75 if (strcmp(str, "single") == 0) { 76 opts->thread_ops = &squashfs_decompressor_single; 77 return 0; 78 } 79 if (strcmp(str, "multi") == 0) { 80 opts->thread_ops = &squashfs_decompressor_multi; 81 return 0; 82 } 83 if (strcmp(str, "percpu") == 0) { 84 opts->thread_ops = &squashfs_decompressor_percpu; 85 return 0; 86 } 87 #endif 88 return -EINVAL; 89 } 90 91 static int squashfs_parse_param_threads_num(const char *str, struct squashfs_mount_opts *opts) 92 { 93 #ifdef CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS 94 int ret; 95 unsigned long num; 96 97 ret = kstrtoul(str, 0, &num); 98 if (ret != 0) 99 return -EINVAL; 100 if (num > 1) { 101 opts->thread_ops = &squashfs_decompressor_multi; 102 if (num > opts->thread_ops->max_decompressors()) 103 return -EINVAL; 104 opts->thread_num = (int)num; 105 return 0; 106 } 107 #ifdef CONFIG_SQUASHFS_DECOMP_SINGLE 108 if (num == 1) { 109 opts->thread_ops = &squashfs_decompressor_single; 110 opts->thread_num = 1; 111 return 0; 112 } 113 #endif 114 #endif /* !CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS */ 115 return -EINVAL; 116 } 117 118 static int squashfs_parse_param_threads(const char *str, struct squashfs_mount_opts *opts) 119 { 120 int ret = squashfs_parse_param_threads_str(str, opts); 121 122 if (ret == 0) 123 return ret; 124 return squashfs_parse_param_threads_num(str, opts); 125 } 126 127 static int squashfs_parse_param(struct fs_context *fc, struct fs_parameter *param) 128 { 129 struct squashfs_mount_opts *opts = fc->fs_private; 130 struct fs_parse_result result; 131 int opt; 132 133 opt = fs_parse(fc, squashfs_fs_parameters, param, &result); 134 if (opt < 0) 135 return opt; 136 137 switch (opt) { 138 case Opt_errors: 139 opts->errors = result.uint_32; 140 break; 141 case Opt_threads: 142 if (squashfs_parse_param_threads(param->string, opts) != 0) 143 return -EINVAL; 144 break; 145 default: 146 return -EINVAL; 147 } 148 149 return 0; 150 } 151 152 static const struct squashfs_decompressor *supported_squashfs_filesystem( 153 struct fs_context *fc, 154 short major, short minor, short id) 155 { 156 const struct squashfs_decompressor *decompressor; 157 158 if (major < SQUASHFS_MAJOR) { 159 errorf(fc, "Major/Minor mismatch, older Squashfs %d.%d " 160 "filesystems are unsupported", major, minor); 161 return NULL; 162 } else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) { 163 errorf(fc, "Major/Minor mismatch, trying to mount newer " 164 "%d.%d filesystem", major, minor); 165 errorf(fc, "Please update your kernel"); 166 return NULL; 167 } 168 169 decompressor = squashfs_lookup_decompressor(id); 170 if (!decompressor->supported) { 171 errorf(fc, "Filesystem uses \"%s\" compression. This is not supported", 172 decompressor->name); 173 return NULL; 174 } 175 176 return decompressor; 177 } 178 179 180 static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc) 181 { 182 struct squashfs_mount_opts *opts = fc->fs_private; 183 struct squashfs_sb_info *msblk; 184 struct squashfs_super_block *sblk = NULL; 185 struct inode *root; 186 long long root_inode; 187 unsigned short flags; 188 unsigned int fragments; 189 u64 lookup_table_start, xattr_id_table_start, next_table; 190 int err; 191 192 TRACE("Entered squashfs_fill_superblock\n"); 193 194 sb->s_fs_info = kzalloc(sizeof(*msblk), GFP_KERNEL); 195 if (sb->s_fs_info == NULL) { 196 ERROR("Failed to allocate squashfs_sb_info\n"); 197 return -ENOMEM; 198 } 199 msblk = sb->s_fs_info; 200 201 msblk->panic_on_errors = (opts->errors == Opt_errors_panic); 202 203 msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); 204 msblk->devblksize_log2 = ffz(~msblk->devblksize); 205 206 mutex_init(&msblk->meta_index_mutex); 207 208 /* 209 * msblk->bytes_used is checked in squashfs_read_table to ensure reads 210 * are not beyond filesystem end. But as we're using 211 * squashfs_read_table here to read the superblock (including the value 212 * of bytes_used) we need to set it to an initial sensible dummy value 213 */ 214 msblk->bytes_used = sizeof(*sblk); 215 sblk = squashfs_read_table(sb, SQUASHFS_START, sizeof(*sblk)); 216 217 if (IS_ERR(sblk)) { 218 errorf(fc, "unable to read squashfs_super_block"); 219 err = PTR_ERR(sblk); 220 sblk = NULL; 221 goto failed_mount; 222 } 223 224 err = -EINVAL; 225 226 /* Check it is a SQUASHFS superblock */ 227 sb->s_magic = le32_to_cpu(sblk->s_magic); 228 if (sb->s_magic != SQUASHFS_MAGIC) { 229 if (!(fc->sb_flags & SB_SILENT)) 230 errorf(fc, "Can't find a SQUASHFS superblock on %pg", 231 sb->s_bdev); 232 goto failed_mount; 233 } 234 msblk->thread_ops = opts->thread_ops; 235 if (opts->thread_num == 0) { 236 msblk->max_thread_num = msblk->thread_ops->max_decompressors(); 237 } else { 238 msblk->max_thread_num = opts->thread_num; 239 } 240 241 /* Check the MAJOR & MINOR versions and lookup compression type */ 242 msblk->decompressor = supported_squashfs_filesystem( 243 fc, 244 le16_to_cpu(sblk->s_major), 245 le16_to_cpu(sblk->s_minor), 246 le16_to_cpu(sblk->compression)); 247 if (msblk->decompressor == NULL) 248 goto failed_mount; 249 250 /* Check the filesystem does not extend beyond the end of the 251 block device */ 252 msblk->bytes_used = le64_to_cpu(sblk->bytes_used); 253 if (msblk->bytes_used < 0 || 254 msblk->bytes_used > bdev_nr_bytes(sb->s_bdev)) 255 goto failed_mount; 256 257 /* Check block size for sanity */ 258 msblk->block_size = le32_to_cpu(sblk->block_size); 259 if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE) 260 goto insanity; 261 262 /* 263 * Check the system page size is not larger than the filesystem 264 * block size (by default 128K). This is currently not supported. 265 */ 266 if (PAGE_SIZE > msblk->block_size) { 267 errorf(fc, "Page size > filesystem block size (%d). This is " 268 "currently not supported!", msblk->block_size); 269 goto failed_mount; 270 } 271 272 /* Check block log for sanity */ 273 msblk->block_log = le16_to_cpu(sblk->block_log); 274 if (msblk->block_log > SQUASHFS_FILE_MAX_LOG) 275 goto failed_mount; 276 277 /* Check that block_size and block_log match */ 278 if (msblk->block_size != (1 << msblk->block_log)) 279 goto insanity; 280 281 /* Check the root inode for sanity */ 282 root_inode = le64_to_cpu(sblk->root_inode); 283 if (SQUASHFS_INODE_OFFSET(root_inode) > SQUASHFS_METADATA_SIZE) 284 goto insanity; 285 286 msblk->inode_table = le64_to_cpu(sblk->inode_table_start); 287 msblk->directory_table = le64_to_cpu(sblk->directory_table_start); 288 msblk->inodes = le32_to_cpu(sblk->inodes); 289 msblk->fragments = le32_to_cpu(sblk->fragments); 290 msblk->ids = le16_to_cpu(sblk->no_ids); 291 flags = le16_to_cpu(sblk->flags); 292 293 TRACE("Found valid superblock on %pg\n", sb->s_bdev); 294 TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(flags) 295 ? "un" : ""); 296 TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(flags) 297 ? "un" : ""); 298 TRACE("Filesystem size %lld bytes\n", msblk->bytes_used); 299 TRACE("Block size %d\n", msblk->block_size); 300 TRACE("Number of inodes %d\n", msblk->inodes); 301 TRACE("Number of fragments %d\n", msblk->fragments); 302 TRACE("Number of ids %d\n", msblk->ids); 303 TRACE("sblk->inode_table_start %llx\n", msblk->inode_table); 304 TRACE("sblk->directory_table_start %llx\n", msblk->directory_table); 305 TRACE("sblk->fragment_table_start %llx\n", 306 (u64) le64_to_cpu(sblk->fragment_table_start)); 307 TRACE("sblk->id_table_start %llx\n", 308 (u64) le64_to_cpu(sblk->id_table_start)); 309 310 sb->s_maxbytes = MAX_LFS_FILESIZE; 311 sb->s_time_min = 0; 312 sb->s_time_max = U32_MAX; 313 sb->s_flags |= SB_RDONLY; 314 sb->s_op = &squashfs_super_ops; 315 316 err = -ENOMEM; 317 318 msblk->block_cache = squashfs_cache_init("metadata", 319 SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE); 320 if (msblk->block_cache == NULL) 321 goto failed_mount; 322 323 /* Allocate read_page block */ 324 msblk->read_page = squashfs_cache_init("data", 325 msblk->max_thread_num, msblk->block_size); 326 if (msblk->read_page == NULL) { 327 errorf(fc, "Failed to allocate read_page block"); 328 goto failed_mount; 329 } 330 331 msblk->stream = squashfs_decompressor_setup(sb, flags); 332 if (IS_ERR(msblk->stream)) { 333 err = PTR_ERR(msblk->stream); 334 msblk->stream = NULL; 335 goto insanity; 336 } 337 338 /* Handle xattrs */ 339 sb->s_xattr = squashfs_xattr_handlers; 340 xattr_id_table_start = le64_to_cpu(sblk->xattr_id_table_start); 341 if (xattr_id_table_start == SQUASHFS_INVALID_BLK) { 342 next_table = msblk->bytes_used; 343 goto allocate_id_index_table; 344 } 345 346 /* Allocate and read xattr id lookup table */ 347 msblk->xattr_id_table = squashfs_read_xattr_id_table(sb, 348 xattr_id_table_start, &msblk->xattr_table, &msblk->xattr_ids); 349 if (IS_ERR(msblk->xattr_id_table)) { 350 errorf(fc, "unable to read xattr id index table"); 351 err = PTR_ERR(msblk->xattr_id_table); 352 msblk->xattr_id_table = NULL; 353 if (err != -ENOTSUPP) 354 goto failed_mount; 355 } 356 next_table = msblk->xattr_table; 357 358 allocate_id_index_table: 359 /* Allocate and read id index table */ 360 msblk->id_table = squashfs_read_id_index_table(sb, 361 le64_to_cpu(sblk->id_table_start), next_table, msblk->ids); 362 if (IS_ERR(msblk->id_table)) { 363 errorf(fc, "unable to read id index table"); 364 err = PTR_ERR(msblk->id_table); 365 msblk->id_table = NULL; 366 goto failed_mount; 367 } 368 next_table = le64_to_cpu(msblk->id_table[0]); 369 370 /* Handle inode lookup table */ 371 lookup_table_start = le64_to_cpu(sblk->lookup_table_start); 372 if (lookup_table_start == SQUASHFS_INVALID_BLK) 373 goto handle_fragments; 374 375 /* Allocate and read inode lookup table */ 376 msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb, 377 lookup_table_start, next_table, msblk->inodes); 378 if (IS_ERR(msblk->inode_lookup_table)) { 379 errorf(fc, "unable to read inode lookup table"); 380 err = PTR_ERR(msblk->inode_lookup_table); 381 msblk->inode_lookup_table = NULL; 382 goto failed_mount; 383 } 384 next_table = le64_to_cpu(msblk->inode_lookup_table[0]); 385 386 sb->s_export_op = &squashfs_export_ops; 387 388 handle_fragments: 389 fragments = msblk->fragments; 390 if (fragments == 0) 391 goto check_directory_table; 392 393 msblk->fragment_cache = squashfs_cache_init("fragment", 394 SQUASHFS_CACHED_FRAGMENTS, msblk->block_size); 395 if (msblk->fragment_cache == NULL) { 396 err = -ENOMEM; 397 goto failed_mount; 398 } 399 400 /* Allocate and read fragment index table */ 401 msblk->fragment_index = squashfs_read_fragment_index_table(sb, 402 le64_to_cpu(sblk->fragment_table_start), next_table, fragments); 403 if (IS_ERR(msblk->fragment_index)) { 404 errorf(fc, "unable to read fragment index table"); 405 err = PTR_ERR(msblk->fragment_index); 406 msblk->fragment_index = NULL; 407 goto failed_mount; 408 } 409 next_table = le64_to_cpu(msblk->fragment_index[0]); 410 411 check_directory_table: 412 /* Sanity check directory_table */ 413 if (msblk->directory_table > next_table) { 414 err = -EINVAL; 415 goto insanity; 416 } 417 418 /* Sanity check inode_table */ 419 if (msblk->inode_table >= msblk->directory_table) { 420 err = -EINVAL; 421 goto insanity; 422 } 423 424 /* allocate root */ 425 root = new_inode(sb); 426 if (!root) { 427 err = -ENOMEM; 428 goto failed_mount; 429 } 430 431 err = squashfs_read_inode(root, root_inode); 432 if (err) { 433 make_bad_inode(root); 434 iput(root); 435 goto failed_mount; 436 } 437 insert_inode_hash(root); 438 439 sb->s_root = d_make_root(root); 440 if (sb->s_root == NULL) { 441 ERROR("Root inode create failed\n"); 442 err = -ENOMEM; 443 goto failed_mount; 444 } 445 446 TRACE("Leaving squashfs_fill_super\n"); 447 kfree(sblk); 448 return 0; 449 450 insanity: 451 errorf(fc, "squashfs image failed sanity check"); 452 failed_mount: 453 squashfs_cache_delete(msblk->block_cache); 454 squashfs_cache_delete(msblk->fragment_cache); 455 squashfs_cache_delete(msblk->read_page); 456 msblk->thread_ops->destroy(msblk); 457 kfree(msblk->inode_lookup_table); 458 kfree(msblk->fragment_index); 459 kfree(msblk->id_table); 460 kfree(msblk->xattr_id_table); 461 kfree(sb->s_fs_info); 462 sb->s_fs_info = NULL; 463 kfree(sblk); 464 return err; 465 } 466 467 static int squashfs_get_tree(struct fs_context *fc) 468 { 469 return get_tree_bdev(fc, squashfs_fill_super); 470 } 471 472 static int squashfs_reconfigure(struct fs_context *fc) 473 { 474 struct super_block *sb = fc->root->d_sb; 475 struct squashfs_sb_info *msblk = sb->s_fs_info; 476 struct squashfs_mount_opts *opts = fc->fs_private; 477 478 sync_filesystem(fc->root->d_sb); 479 fc->sb_flags |= SB_RDONLY; 480 481 msblk->panic_on_errors = (opts->errors == Opt_errors_panic); 482 483 return 0; 484 } 485 486 static void squashfs_free_fs_context(struct fs_context *fc) 487 { 488 kfree(fc->fs_private); 489 } 490 491 static const struct fs_context_operations squashfs_context_ops = { 492 .get_tree = squashfs_get_tree, 493 .free = squashfs_free_fs_context, 494 .parse_param = squashfs_parse_param, 495 .reconfigure = squashfs_reconfigure, 496 }; 497 498 static int squashfs_show_options(struct seq_file *s, struct dentry *root) 499 { 500 struct super_block *sb = root->d_sb; 501 struct squashfs_sb_info *msblk = sb->s_fs_info; 502 503 if (msblk->panic_on_errors) 504 seq_puts(s, ",errors=panic"); 505 else 506 seq_puts(s, ",errors=continue"); 507 508 #ifdef CONFIG_SQUASHFS_CHOICE_DECOMP_BY_MOUNT 509 if (msblk->thread_ops == &squashfs_decompressor_single) { 510 seq_puts(s, ",threads=single"); 511 return 0; 512 } 513 if (msblk->thread_ops == &squashfs_decompressor_percpu) { 514 seq_puts(s, ",threads=percpu"); 515 return 0; 516 } 517 #endif 518 #ifdef CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS 519 seq_printf(s, ",threads=%d", msblk->max_thread_num); 520 #endif 521 return 0; 522 } 523 524 static int squashfs_init_fs_context(struct fs_context *fc) 525 { 526 struct squashfs_mount_opts *opts; 527 528 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 529 if (!opts) 530 return -ENOMEM; 531 532 #ifdef CONFIG_SQUASHFS_DECOMP_SINGLE 533 opts->thread_ops = &squashfs_decompressor_single; 534 #elif defined(CONFIG_SQUASHFS_DECOMP_MULTI) 535 opts->thread_ops = &squashfs_decompressor_multi; 536 #elif defined(CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU) 537 opts->thread_ops = &squashfs_decompressor_percpu; 538 #else 539 #error "fail: unknown squashfs decompression thread mode?" 540 #endif 541 opts->thread_num = 0; 542 fc->fs_private = opts; 543 fc->ops = &squashfs_context_ops; 544 return 0; 545 } 546 547 static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf) 548 { 549 struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info; 550 u64 id = huge_encode_dev(dentry->d_sb->s_bdev->bd_dev); 551 552 TRACE("Entered squashfs_statfs\n"); 553 554 buf->f_type = SQUASHFS_MAGIC; 555 buf->f_bsize = msblk->block_size; 556 buf->f_blocks = ((msblk->bytes_used - 1) >> msblk->block_log) + 1; 557 buf->f_bfree = buf->f_bavail = 0; 558 buf->f_files = msblk->inodes; 559 buf->f_ffree = 0; 560 buf->f_namelen = SQUASHFS_NAME_LEN; 561 buf->f_fsid = u64_to_fsid(id); 562 563 return 0; 564 } 565 566 567 static void squashfs_put_super(struct super_block *sb) 568 { 569 if (sb->s_fs_info) { 570 struct squashfs_sb_info *sbi = sb->s_fs_info; 571 squashfs_cache_delete(sbi->block_cache); 572 squashfs_cache_delete(sbi->fragment_cache); 573 squashfs_cache_delete(sbi->read_page); 574 sbi->thread_ops->destroy(sbi); 575 kfree(sbi->id_table); 576 kfree(sbi->fragment_index); 577 kfree(sbi->meta_index); 578 kfree(sbi->inode_lookup_table); 579 kfree(sbi->xattr_id_table); 580 kfree(sb->s_fs_info); 581 sb->s_fs_info = NULL; 582 } 583 } 584 585 static struct kmem_cache *squashfs_inode_cachep; 586 587 588 static void init_once(void *foo) 589 { 590 struct squashfs_inode_info *ei = foo; 591 592 inode_init_once(&ei->vfs_inode); 593 } 594 595 596 static int __init init_inodecache(void) 597 { 598 squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache", 599 sizeof(struct squashfs_inode_info), 0, 600 SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, 601 init_once); 602 603 return squashfs_inode_cachep ? 0 : -ENOMEM; 604 } 605 606 607 static void destroy_inodecache(void) 608 { 609 /* 610 * Make sure all delayed rcu free inodes are flushed before we 611 * destroy cache. 612 */ 613 rcu_barrier(); 614 kmem_cache_destroy(squashfs_inode_cachep); 615 } 616 617 618 static int __init init_squashfs_fs(void) 619 { 620 int err = init_inodecache(); 621 622 if (err) 623 return err; 624 625 err = register_filesystem(&squashfs_fs_type); 626 if (err) { 627 destroy_inodecache(); 628 return err; 629 } 630 631 pr_info("version 4.0 (2009/01/31) Phillip Lougher\n"); 632 633 return 0; 634 } 635 636 637 static void __exit exit_squashfs_fs(void) 638 { 639 unregister_filesystem(&squashfs_fs_type); 640 destroy_inodecache(); 641 } 642 643 644 static struct inode *squashfs_alloc_inode(struct super_block *sb) 645 { 646 struct squashfs_inode_info *ei = 647 alloc_inode_sb(sb, squashfs_inode_cachep, GFP_KERNEL); 648 649 return ei ? &ei->vfs_inode : NULL; 650 } 651 652 653 static void squashfs_free_inode(struct inode *inode) 654 { 655 kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode)); 656 } 657 658 static struct file_system_type squashfs_fs_type = { 659 .owner = THIS_MODULE, 660 .name = "squashfs", 661 .init_fs_context = squashfs_init_fs_context, 662 .parameters = squashfs_fs_parameters, 663 .kill_sb = kill_block_super, 664 .fs_flags = FS_REQUIRES_DEV 665 }; 666 MODULE_ALIAS_FS("squashfs"); 667 668 static const struct super_operations squashfs_super_ops = { 669 .alloc_inode = squashfs_alloc_inode, 670 .free_inode = squashfs_free_inode, 671 .statfs = squashfs_statfs, 672 .put_super = squashfs_put_super, 673 .show_options = squashfs_show_options, 674 }; 675 676 module_init(init_squashfs_fs); 677 module_exit(exit_squashfs_fs); 678 MODULE_DESCRIPTION("squashfs 4.0, a compressed read-only filesystem"); 679 MODULE_AUTHOR("Phillip Lougher <phillip@squashfs.org.uk>"); 680 MODULE_LICENSE("GPL"); 681