1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 * 7 * terminology 8 * 9 * cluster - allocation unit - 512,1K,2K,4K,...,2M 10 * vcn - virtual cluster number - Offset inside the file in clusters. 11 * vbo - virtual byte offset - Offset inside the file in bytes. 12 * lcn - logical cluster number - 0 based cluster in clusters heap. 13 * lbo - logical byte offset - Absolute position inside volume. 14 * run - maps VCN to LCN - Stored in attributes in packed form. 15 * attr - attribute segment - std/name/data etc records inside MFT. 16 * mi - MFT inode - One MFT record(usually 1024 bytes or 4K), consists of attributes. 17 * ni - NTFS inode - Extends linux inode. consists of one or more mft inodes. 18 * index - unit inside directory - 2K, 4K, <=page size, does not depend on cluster size. 19 * resident attribute - Attribute with content stored directly in the MFT record 20 * non-resident attribute - Attribute with content stored in clusters 21 * data_size - Size of attribute content in bytes. Equal to inode->i_size 22 * valid_size - Number of bytes written to the non-resident attribute 23 * allocated_size - Total size of clusters allocated for non-resident content 24 * total_size - Actual size of allocated clusters for sparse or compressed attributes 25 * - Constraint: valid_size <= data_size <= allocated_size 26 * 27 * WSL - Windows Subsystem for Linux 28 * https://docs.microsoft.com/en-us/windows/wsl/file-permissions 29 * It stores uid/gid/mode/dev in xattr 30 * 31 * ntfs allows up to 2^64 clusters per volume. 32 * It means you should use 64 bits lcn to operate with ntfs. 33 * Implementation of ntfs.sys uses only 32 bits lcn. 34 * Default ntfs3 uses 32 bits lcn too. 35 * ntfs3 built with CONFIG_NTFS3_64BIT_CLUSTER (ntfs3_64) uses 64 bits per lcn. 36 * 37 * 38 * ntfs limits, cluster size is 4K (2^12) 39 * ----------------------------------------------------------------------------- 40 * | Volume size | Clusters | ntfs.sys | ntfs3 | ntfs3_64 | mkntfs | chkdsk | 41 * ----------------------------------------------------------------------------- 42 * | < 16T, 2^44 | < 2^32 | yes | yes | yes | yes | yes | 43 * | > 16T, 2^44 | > 2^32 | no | no | yes | yes | yes | 44 * ----------------------------------------------------------|------------------ 45 * 46 * To mount large volumes as ntfs one should use large cluster size (up to 2M) 47 * The maximum volume size in this case is 2^32 * 2^21 = 2^53 = 8P 48 * 49 * ntfs limits, cluster size is 2M (2^21) 50 * ----------------------------------------------------------------------------- 51 * | < 8P, 2^53 | < 2^32 | yes | yes | yes | yes | yes | 52 * | > 8P, 2^53 | > 2^32 | no | no | yes | yes | yes | 53 * ----------------------------------------------------------|------------------ 54 * 55 */ 56 57 #include <linux/blkdev.h> 58 #include <linux/buffer_head.h> 59 #include <linux/exportfs.h> 60 #include <linux/fs.h> 61 #include <linux/fs_struct.h> 62 #include <linux/fs_context.h> 63 #include <linux/fs_parser.h> 64 #include <linux/log2.h> 65 #include <linux/minmax.h> 66 #include <linux/module.h> 67 #include <linux/nls.h> 68 #include <linux/proc_fs.h> 69 #include <linux/seq_file.h> 70 #include <linux/statfs.h> 71 72 #include "debug.h" 73 #include "ntfs.h" 74 #include "ntfs_fs.h" 75 #ifdef CONFIG_NTFS3_LZX_XPRESS 76 #include "lib/lib.h" 77 #endif 78 79 #ifdef CONFIG_PRINTK 80 /* 81 * ntfs_printk - Trace warnings/notices/errors. 82 * 83 * Thanks Joe Perches <joe@perches.com> for implementation 84 */ 85 void ntfs_printk(const struct super_block *sb, const char *fmt, ...) 86 { 87 struct va_format vaf; 88 va_list args; 89 int level; 90 struct ntfs_sb_info *sbi = sb->s_fs_info; 91 92 /* Should we use different ratelimits for warnings/notices/errors? */ 93 if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3")) 94 return; 95 96 va_start(args, fmt); 97 98 level = printk_get_level(fmt); 99 vaf.fmt = printk_skip_level(fmt); 100 vaf.va = &args; 101 printk("%c%cntfs3(%s): %pV\n", KERN_SOH_ASCII, level, sb->s_id, &vaf); 102 103 va_end(args); 104 } 105 106 static char s_name_buf[512]; 107 static atomic_t s_name_buf_cnt = ATOMIC_INIT(1); // 1 means 'free s_name_buf'. 108 109 /* 110 * ntfs_inode_printk 111 * 112 * Print warnings/notices/errors about inode using name or inode number. 113 */ 114 void ntfs_inode_printk(struct inode *inode, const char *fmt, ...) 115 { 116 struct super_block *sb = inode->i_sb; 117 struct ntfs_sb_info *sbi = sb->s_fs_info; 118 char *name; 119 va_list args; 120 struct va_format vaf; 121 int level; 122 123 if (!___ratelimit(&sbi->msg_ratelimit, "ntfs3")) 124 return; 125 126 /* Use static allocated buffer, if possible. */ 127 name = atomic_dec_and_test(&s_name_buf_cnt) ? 128 s_name_buf : 129 kmalloc(sizeof(s_name_buf), GFP_NOFS); 130 131 if (name) { 132 struct dentry *de = d_find_alias(inode); 133 134 if (de) { 135 int len; 136 spin_lock(&de->d_lock); 137 len = snprintf(name, sizeof(s_name_buf), " \"%s\"", 138 de->d_name.name); 139 spin_unlock(&de->d_lock); 140 if (len <= 0) 141 name[0] = 0; 142 else if (len >= sizeof(s_name_buf)) 143 name[sizeof(s_name_buf) - 1] = 0; 144 } else { 145 name[0] = 0; 146 } 147 dput(de); /* Cocci warns if placed in branch "if (de)" */ 148 } 149 150 va_start(args, fmt); 151 152 level = printk_get_level(fmt); 153 vaf.fmt = printk_skip_level(fmt); 154 vaf.va = &args; 155 156 printk("%c%cntfs3(%s): ino=%lx,%s %pV\n", KERN_SOH_ASCII, level, 157 sb->s_id, inode->i_ino, name ? name : "", &vaf); 158 159 va_end(args); 160 161 atomic_inc(&s_name_buf_cnt); 162 if (name != s_name_buf) 163 kfree(name); 164 } 165 #endif 166 167 /* 168 * Shared memory struct. 169 * 170 * On-disk ntfs's upcase table is created by ntfs formatter. 171 * 'upcase' table is 128K bytes of memory. 172 * We should read it into memory when mounting. 173 * Several ntfs volumes likely use the same 'upcase' table. 174 * It is good idea to share in-memory 'upcase' table between different volumes. 175 * Unfortunately winxp/vista/win7 use different upcase tables. 176 */ 177 static DEFINE_SPINLOCK(s_shared_lock); 178 179 static struct { 180 void *ptr; 181 u32 len; 182 int cnt; 183 } s_shared[8]; 184 185 /* 186 * ntfs_set_shared 187 * 188 * Return: 189 * * @ptr - If pointer was saved in shared memory. 190 * * NULL - If pointer was not shared. 191 */ 192 void *ntfs_set_shared(void *ptr, u32 bytes) 193 { 194 void *ret = NULL; 195 int i, j = -1; 196 197 spin_lock(&s_shared_lock); 198 for (i = 0; i < ARRAY_SIZE(s_shared); i++) { 199 if (!s_shared[i].cnt) { 200 j = i; 201 } else if (bytes == s_shared[i].len && 202 !memcmp(s_shared[i].ptr, ptr, bytes)) { 203 s_shared[i].cnt += 1; 204 ret = s_shared[i].ptr; 205 break; 206 } 207 } 208 209 if (!ret && j != -1) { 210 s_shared[j].ptr = ptr; 211 s_shared[j].len = bytes; 212 s_shared[j].cnt = 1; 213 ret = ptr; 214 } 215 spin_unlock(&s_shared_lock); 216 217 return ret; 218 } 219 220 /* 221 * ntfs_put_shared 222 * 223 * Return: 224 * * @ptr - If pointer is not shared anymore. 225 * * NULL - If pointer is still shared. 226 */ 227 void *ntfs_put_shared(void *ptr) 228 { 229 void *ret = ptr; 230 int i; 231 232 spin_lock(&s_shared_lock); 233 for (i = 0; i < ARRAY_SIZE(s_shared); i++) { 234 if (s_shared[i].cnt && s_shared[i].ptr == ptr) { 235 if (--s_shared[i].cnt) 236 ret = NULL; 237 break; 238 } 239 } 240 spin_unlock(&s_shared_lock); 241 242 return ret; 243 } 244 245 static inline void put_mount_options(struct ntfs_mount_options *options) 246 { 247 kfree(options->nls_name); 248 unload_nls(options->nls); 249 kfree(options); 250 } 251 252 enum Opt { 253 Opt_uid, 254 Opt_gid, 255 Opt_umask, 256 Opt_dmask, 257 Opt_fmask, 258 Opt_immutable, 259 Opt_discard, 260 Opt_force, 261 Opt_sparse, 262 Opt_nohidden, 263 Opt_hide_dot_files, 264 Opt_windows_names, 265 Opt_showmeta, 266 Opt_acl, 267 Opt_iocharset, 268 Opt_prealloc, 269 Opt_nocase, 270 Opt_err, 271 }; 272 273 // clang-format off 274 static const struct fs_parameter_spec ntfs_fs_parameters[] = { 275 fsparam_uid("uid", Opt_uid), 276 fsparam_gid("gid", Opt_gid), 277 fsparam_u32oct("umask", Opt_umask), 278 fsparam_u32oct("dmask", Opt_dmask), 279 fsparam_u32oct("fmask", Opt_fmask), 280 fsparam_flag("sys_immutable", Opt_immutable), 281 fsparam_flag("discard", Opt_discard), 282 fsparam_flag("force", Opt_force), 283 fsparam_flag("sparse", Opt_sparse), 284 fsparam_flag("nohidden", Opt_nohidden), 285 fsparam_flag("hide_dot_files", Opt_hide_dot_files), 286 fsparam_flag("windows_names", Opt_windows_names), 287 fsparam_flag("showmeta", Opt_showmeta), 288 fsparam_flag_no("acl", Opt_acl), 289 fsparam_string("iocharset", Opt_iocharset), 290 fsparam_flag_no("prealloc", Opt_prealloc), 291 fsparam_flag("nocase", Opt_nocase), 292 {} 293 }; 294 // clang-format on 295 296 /* 297 * Load nls table or if @nls is utf8 then return NULL. 298 * 299 */ 300 static struct nls_table *ntfs_load_nls(const char *nls) 301 { 302 struct nls_table *ret; 303 304 if (!nls) 305 nls = CONFIG_NLS_DEFAULT; 306 307 if (strcmp(nls, "utf8") == 0) 308 return NULL; 309 310 if (strcmp(nls, CONFIG_NLS_DEFAULT) == 0) 311 return load_nls_default(); 312 313 ret = load_nls(nls); 314 if (ret) 315 return ret; 316 317 return ERR_PTR(-EINVAL); 318 } 319 320 static int ntfs_fs_parse_param(struct fs_context *fc, 321 struct fs_parameter *param) 322 { 323 struct ntfs_mount_options *opts = fc->fs_private; 324 struct fs_parse_result result; 325 int opt; 326 327 opt = fs_parse(fc, ntfs_fs_parameters, param, &result); 328 if (opt < 0) 329 return opt; 330 331 switch (opt) { 332 case Opt_uid: 333 opts->fs_uid = result.uid; 334 break; 335 case Opt_gid: 336 opts->fs_gid = result.gid; 337 break; 338 case Opt_umask: 339 if (result.uint_32 & ~07777) 340 return invalf(fc, "ntfs3: Invalid value for umask."); 341 opts->fs_fmask_inv = ~result.uint_32; 342 opts->fs_dmask_inv = ~result.uint_32; 343 opts->fmask = 1; 344 opts->dmask = 1; 345 break; 346 case Opt_dmask: 347 if (result.uint_32 & ~07777) 348 return invalf(fc, "ntfs3: Invalid value for dmask."); 349 opts->fs_dmask_inv = ~result.uint_32; 350 opts->dmask = 1; 351 break; 352 case Opt_fmask: 353 if (result.uint_32 & ~07777) 354 return invalf(fc, "ntfs3: Invalid value for fmask."); 355 opts->fs_fmask_inv = ~result.uint_32; 356 opts->fmask = 1; 357 break; 358 case Opt_immutable: 359 opts->sys_immutable = 1; 360 break; 361 case Opt_discard: 362 opts->discard = 1; 363 break; 364 case Opt_force: 365 opts->force = 1; 366 break; 367 case Opt_sparse: 368 opts->sparse = 1; 369 break; 370 case Opt_nohidden: 371 opts->nohidden = 1; 372 break; 373 case Opt_hide_dot_files: 374 opts->hide_dot_files = 1; 375 break; 376 case Opt_windows_names: 377 opts->windows_names = 1; 378 break; 379 case Opt_showmeta: 380 opts->showmeta = 1; 381 break; 382 case Opt_acl: 383 if (!result.negated) 384 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 385 fc->sb_flags |= SB_POSIXACL; 386 #else 387 return invalf( 388 fc, "ntfs3: Support for ACL not compiled in!"); 389 #endif 390 else 391 fc->sb_flags &= ~SB_POSIXACL; 392 break; 393 case Opt_iocharset: 394 kfree(opts->nls_name); 395 opts->nls_name = param->string; 396 param->string = NULL; 397 break; 398 case Opt_prealloc: 399 opts->prealloc = !result.negated; 400 break; 401 case Opt_nocase: 402 opts->nocase = 1; 403 break; 404 default: 405 /* Should not be here unless we forget add case. */ 406 return -EINVAL; 407 } 408 return 0; 409 } 410 411 static int ntfs_fs_reconfigure(struct fs_context *fc) 412 { 413 struct super_block *sb = fc->root->d_sb; 414 struct ntfs_sb_info *sbi = sb->s_fs_info; 415 struct ntfs_mount_options *new_opts = fc->fs_private; 416 int ro_rw; 417 418 /* If ntfs3 is used as legacy ntfs enforce read-only mode. */ 419 if (is_legacy_ntfs(sb)) { 420 fc->sb_flags |= SB_RDONLY; 421 goto out; 422 } 423 424 ro_rw = sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY); 425 if (ro_rw && (sbi->flags & NTFS_FLAGS_NEED_REPLAY)) { 426 errorf(fc, 427 "ntfs3: Couldn't remount rw because journal is not replayed. Please umount/remount instead\n"); 428 return -EINVAL; 429 } 430 431 new_opts->nls = ntfs_load_nls(new_opts->nls_name); 432 if (IS_ERR(new_opts->nls)) { 433 new_opts->nls = NULL; 434 errorf(fc, "ntfs3: Cannot load iocharset %s", 435 new_opts->nls_name); 436 return -EINVAL; 437 } 438 if (new_opts->nls != sbi->options->nls) 439 return invalf( 440 fc, 441 "ntfs3: Cannot use different iocharset when remounting!"); 442 443 if (ro_rw && (sbi->volume.flags & VOLUME_FLAG_DIRTY) && 444 !new_opts->force) { 445 errorf(fc, 446 "ntfs3: Volume is dirty and \"force\" flag is not set!"); 447 return -EINVAL; 448 } 449 450 out: 451 sync_filesystem(sb); 452 swap(sbi->options, fc->fs_private); 453 454 return 0; 455 } 456 457 #ifdef CONFIG_PROC_FS 458 static struct proc_dir_entry *proc_info_root; 459 460 /* 461 * ntfs3_volinfo: 462 * 463 * The content of /proc/fs/ntfs3/<dev>/volinfo 464 * 465 * ntfs3.1 466 * cluster size 467 * number of clusters 468 * total number of mft records 469 * number of used mft records ~= number of files + folders 470 * real state of ntfs "dirty"/"clean" 471 * current state of ntfs "dirty"/"clean" 472 */ 473 static int ntfs3_volinfo(struct seq_file *m, void *o) 474 { 475 struct super_block *sb = m->private; 476 struct ntfs_sb_info *sbi = sb->s_fs_info; 477 478 seq_printf(m, "ntfs%d.%d\n%u\n%zu\n%zu\n%zu\n%s\n%s\n", 479 sbi->volume.major_ver, sbi->volume.minor_ver, 480 sbi->cluster_size, sbi->used.bitmap.nbits, 481 sbi->mft.bitmap.nbits, 482 sbi->mft.bitmap.nbits - wnd_zeroes(&sbi->mft.bitmap), 483 sbi->volume.real_dirty ? "dirty" : "clean", 484 (sbi->volume.flags & VOLUME_FLAG_DIRTY) ? "dirty" : "clean"); 485 486 return 0; 487 } 488 489 static int ntfs3_volinfo_open(struct inode *inode, struct file *file) 490 { 491 return single_open(file, ntfs3_volinfo, pde_data(inode)); 492 } 493 494 /* read /proc/fs/ntfs3/<dev>/label */ 495 static int ntfs3_label_show(struct seq_file *m, void *o) 496 { 497 struct super_block *sb = m->private; 498 struct ntfs_sb_info *sbi = sb->s_fs_info; 499 500 seq_printf(m, "%s\n", sbi->volume.label); 501 502 return 0; 503 } 504 505 /* write /proc/fs/ntfs3/<dev>/label */ 506 static ssize_t ntfs3_label_write(struct file *file, const char __user *buffer, 507 size_t count, loff_t *ppos) 508 { 509 int err; 510 struct super_block *sb = pde_data(file_inode(file)); 511 ssize_t ret = count; 512 u8 *label; 513 514 if (sb_rdonly(sb)) 515 return -EROFS; 516 517 label = kmalloc(count, GFP_NOFS); 518 519 if (!label) 520 return -ENOMEM; 521 522 if (copy_from_user(label, buffer, ret)) { 523 ret = -EFAULT; 524 goto out; 525 } 526 while (ret > 0 && label[ret - 1] == '\n') 527 ret -= 1; 528 529 err = ntfs_set_label(sb->s_fs_info, label, ret); 530 531 if (err < 0) { 532 ntfs_err(sb, "failed (%d) to write label", err); 533 ret = err; 534 goto out; 535 } 536 537 *ppos += count; 538 ret = count; 539 out: 540 kfree(label); 541 return ret; 542 } 543 544 static int ntfs3_label_open(struct inode *inode, struct file *file) 545 { 546 return single_open(file, ntfs3_label_show, pde_data(inode)); 547 } 548 549 static const struct proc_ops ntfs3_volinfo_fops = { 550 .proc_read = seq_read, 551 .proc_lseek = seq_lseek, 552 .proc_release = single_release, 553 .proc_open = ntfs3_volinfo_open, 554 }; 555 556 static const struct proc_ops ntfs3_label_fops = { 557 .proc_read = seq_read, 558 .proc_lseek = seq_lseek, 559 .proc_release = single_release, 560 .proc_open = ntfs3_label_open, 561 .proc_write = ntfs3_label_write, 562 }; 563 564 static void ntfs_create_procdir(struct super_block *sb) 565 { 566 struct proc_dir_entry *e; 567 568 if (!proc_info_root) 569 return; 570 571 e = proc_mkdir(sb->s_id, proc_info_root); 572 if (e) { 573 struct ntfs_sb_info *sbi = sb->s_fs_info; 574 575 proc_create_data("volinfo", 0444, e, &ntfs3_volinfo_fops, sb); 576 proc_create_data("label", 0644, e, &ntfs3_label_fops, sb); 577 sbi->procdir = e; 578 } 579 } 580 581 static void ntfs_remove_procdir(struct super_block *sb) 582 { 583 struct ntfs_sb_info *sbi = sb->s_fs_info; 584 585 if (!sbi->procdir) 586 return; 587 588 remove_proc_entry("label", sbi->procdir); 589 remove_proc_entry("volinfo", sbi->procdir); 590 remove_proc_entry(sb->s_id, proc_info_root); 591 sbi->procdir = NULL; 592 } 593 594 static void ntfs_create_proc_root(void) 595 { 596 proc_info_root = proc_mkdir("fs/ntfs3", NULL); 597 } 598 599 static void ntfs_remove_proc_root(void) 600 { 601 if (proc_info_root) { 602 remove_proc_entry("fs/ntfs3", NULL); 603 proc_info_root = NULL; 604 } 605 } 606 #else 607 // clang-format off 608 static void ntfs_create_procdir(struct super_block *sb){} 609 static void ntfs_remove_procdir(struct super_block *sb){} 610 static void ntfs_create_proc_root(void){} 611 static void ntfs_remove_proc_root(void){} 612 // clang-format on 613 #endif 614 615 static struct kmem_cache *ntfs_inode_cachep; 616 617 static struct inode *ntfs_alloc_inode(struct super_block *sb) 618 { 619 struct ntfs_inode *ni = alloc_inode_sb(sb, ntfs_inode_cachep, GFP_NOFS); 620 621 if (!ni) 622 return NULL; 623 624 memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode)); 625 mutex_init(&ni->ni_lock); 626 return &ni->vfs_inode; 627 } 628 629 static void ntfs_free_inode(struct inode *inode) 630 { 631 struct ntfs_inode *ni = ntfs_i(inode); 632 633 mutex_destroy(&ni->ni_lock); 634 kmem_cache_free(ntfs_inode_cachep, ni); 635 } 636 637 static void init_once(void *foo) 638 { 639 struct ntfs_inode *ni = foo; 640 641 inode_init_once(&ni->vfs_inode); 642 } 643 644 /* 645 * Noinline to reduce binary size. 646 */ 647 static noinline void ntfs3_put_sbi(struct ntfs_sb_info *sbi) 648 { 649 wnd_close(&sbi->mft.bitmap); 650 wnd_close(&sbi->used.bitmap); 651 652 if (sbi->mft.ni) { 653 iput(&sbi->mft.ni->vfs_inode); 654 sbi->mft.ni = NULL; 655 } 656 657 if (sbi->security.ni) { 658 iput(&sbi->security.ni->vfs_inode); 659 sbi->security.ni = NULL; 660 } 661 662 if (sbi->reparse.ni) { 663 iput(&sbi->reparse.ni->vfs_inode); 664 sbi->reparse.ni = NULL; 665 } 666 667 if (sbi->objid.ni) { 668 iput(&sbi->objid.ni->vfs_inode); 669 sbi->objid.ni = NULL; 670 } 671 672 if (sbi->volume.ni) { 673 iput(&sbi->volume.ni->vfs_inode); 674 sbi->volume.ni = NULL; 675 } 676 677 ntfs_update_mftmirr(sbi, 0); 678 679 indx_clear(&sbi->security.index_sii); 680 indx_clear(&sbi->security.index_sdh); 681 indx_clear(&sbi->reparse.index_r); 682 indx_clear(&sbi->objid.index_o); 683 } 684 685 static void ntfs3_free_sbi(struct ntfs_sb_info *sbi) 686 { 687 kfree(sbi->new_rec); 688 kvfree(ntfs_put_shared(sbi->upcase)); 689 kvfree(sbi->def_table); 690 kfree(sbi->compress.lznt); 691 #ifdef CONFIG_NTFS3_LZX_XPRESS 692 xpress_free_decompressor(sbi->compress.xpress); 693 lzx_free_decompressor(sbi->compress.lzx); 694 #endif 695 kfree(sbi); 696 } 697 698 static void ntfs_put_super(struct super_block *sb) 699 { 700 struct ntfs_sb_info *sbi = sb->s_fs_info; 701 702 ntfs_remove_procdir(sb); 703 704 /* Mark rw ntfs as clear, if possible. */ 705 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 706 707 if (sbi->options) { 708 unload_nls(sbi->options->nls); 709 kfree(sbi->options->nls_name); 710 kfree(sbi->options); 711 sbi->options = NULL; 712 } 713 714 ntfs3_put_sbi(sbi); 715 } 716 717 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf) 718 { 719 struct super_block *sb = dentry->d_sb; 720 struct ntfs_sb_info *sbi = sb->s_fs_info; 721 struct wnd_bitmap *wnd = &sbi->used.bitmap; 722 723 buf->f_type = sb->s_magic; 724 buf->f_bsize = sbi->cluster_size; 725 buf->f_blocks = wnd->nbits; 726 727 buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd); 728 buf->f_fsid.val[0] = sbi->volume.ser_num; 729 buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32); 730 buf->f_namelen = NTFS_NAME_LEN; 731 732 return 0; 733 } 734 735 static int ntfs_show_options(struct seq_file *m, struct dentry *root) 736 { 737 struct super_block *sb = root->d_sb; 738 struct ntfs_sb_info *sbi = sb->s_fs_info; 739 struct ntfs_mount_options *opts = sbi->options; 740 struct user_namespace *user_ns = seq_user_ns(m); 741 742 seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid)); 743 seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid)); 744 if (opts->dmask) 745 seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff); 746 if (opts->fmask) 747 seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff); 748 if (opts->sys_immutable) 749 seq_puts(m, ",sys_immutable"); 750 if (opts->discard) 751 seq_puts(m, ",discard"); 752 if (opts->force) 753 seq_puts(m, ",force"); 754 if (opts->sparse) 755 seq_puts(m, ",sparse"); 756 if (opts->nohidden) 757 seq_puts(m, ",nohidden"); 758 if (opts->hide_dot_files) 759 seq_puts(m, ",hide_dot_files"); 760 if (opts->windows_names) 761 seq_puts(m, ",windows_names"); 762 if (opts->showmeta) 763 seq_puts(m, ",showmeta"); 764 if (sb->s_flags & SB_POSIXACL) 765 seq_puts(m, ",acl"); 766 if (opts->nls) 767 seq_printf(m, ",iocharset=%s", opts->nls->charset); 768 else 769 seq_puts(m, ",iocharset=utf8"); 770 if (opts->prealloc) 771 seq_puts(m, ",prealloc"); 772 if (opts->nocase) 773 seq_puts(m, ",nocase"); 774 775 return 0; 776 } 777 778 /* 779 * ntfs_shutdown - super_operations::shutdown 780 */ 781 static void ntfs_shutdown(struct super_block *sb) 782 { 783 set_bit(NTFS_FLAGS_SHUTDOWN_BIT, &ntfs_sb(sb)->flags); 784 } 785 786 /* 787 * ntfs_sync_fs - super_operations::sync_fs 788 */ 789 static int ntfs_sync_fs(struct super_block *sb, int wait) 790 { 791 int err = 0, err2; 792 struct ntfs_sb_info *sbi = sb->s_fs_info; 793 struct ntfs_inode *ni; 794 struct inode *inode; 795 796 if (unlikely(ntfs3_forced_shutdown(sb))) 797 return -EIO; 798 799 ni = sbi->security.ni; 800 if (ni) { 801 inode = &ni->vfs_inode; 802 err2 = _ni_write_inode(inode, wait); 803 if (err2 && !err) 804 err = err2; 805 } 806 807 ni = sbi->objid.ni; 808 if (ni) { 809 inode = &ni->vfs_inode; 810 err2 = _ni_write_inode(inode, wait); 811 if (err2 && !err) 812 err = err2; 813 } 814 815 ni = sbi->reparse.ni; 816 if (ni) { 817 inode = &ni->vfs_inode; 818 err2 = _ni_write_inode(inode, wait); 819 if (err2 && !err) 820 err = err2; 821 } 822 823 if (!err) 824 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 825 826 ntfs_update_mftmirr(sbi, wait); 827 828 return err; 829 } 830 831 static const struct super_operations ntfs_sops = { 832 .alloc_inode = ntfs_alloc_inode, 833 .free_inode = ntfs_free_inode, 834 .evict_inode = ntfs_evict_inode, 835 .put_super = ntfs_put_super, 836 .statfs = ntfs_statfs, 837 .show_options = ntfs_show_options, 838 .shutdown = ntfs_shutdown, 839 .sync_fs = ntfs_sync_fs, 840 .write_inode = ntfs3_write_inode, 841 }; 842 843 static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino, 844 u32 generation) 845 { 846 struct MFT_REF ref; 847 struct inode *inode; 848 849 ref.low = cpu_to_le32(ino); 850 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 851 ref.high = cpu_to_le16(ino >> 32); 852 #else 853 ref.high = 0; 854 #endif 855 ref.seq = cpu_to_le16(generation); 856 857 inode = ntfs_iget5(sb, &ref, NULL); 858 if (!IS_ERR(inode) && is_bad_inode(inode)) { 859 iput(inode); 860 inode = ERR_PTR(-ESTALE); 861 } 862 863 return inode; 864 } 865 866 static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid, 867 int fh_len, int fh_type) 868 { 869 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 870 ntfs_export_get_inode); 871 } 872 873 static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid, 874 int fh_len, int fh_type) 875 { 876 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 877 ntfs_export_get_inode); 878 } 879 880 /* TODO: == ntfs_sync_inode */ 881 static int ntfs_nfs_commit_metadata(struct inode *inode) 882 { 883 return _ni_write_inode(inode, 1); 884 } 885 886 static const struct export_operations ntfs_export_ops = { 887 .encode_fh = generic_encode_ino32_fh, 888 .fh_to_dentry = ntfs_fh_to_dentry, 889 .fh_to_parent = ntfs_fh_to_parent, 890 .get_parent = ntfs3_get_parent, 891 .commit_metadata = ntfs_nfs_commit_metadata, 892 }; 893 894 /* 895 * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb". 896 */ 897 static u32 format_size_gb(const u64 bytes, u32 *mb) 898 { 899 /* Do simple right 30 bit shift of 64 bit value. */ 900 u64 kbytes = bytes >> 10; 901 u32 kbytes32 = kbytes; 902 903 *mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20; 904 if (*mb >= 100) 905 *mb = 99; 906 907 return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12); 908 } 909 910 static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot) 911 { 912 if (boot->sectors_per_clusters <= 0x80) 913 return boot->sectors_per_clusters; 914 if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */ 915 return 1U << (-(s8)boot->sectors_per_clusters); 916 return -EINVAL; 917 } 918 919 /* 920 * ntfs_init_from_boot - Init internal info from on-disk boot sector. 921 * 922 * NTFS mount begins from boot - special formatted 512 bytes. 923 * There are two boots: the first and the last 512 bytes of volume. 924 * The content of boot is not changed during ntfs life. 925 * 926 * NOTE: ntfs.sys checks only first (primary) boot. 927 * chkdsk checks both boots. 928 */ 929 static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, 930 u64 dev_size, struct NTFS_BOOT **boot2) 931 { 932 struct ntfs_sb_info *sbi = sb->s_fs_info; 933 int err; 934 u32 mb, gb, boot_sector_size, sct_per_clst, record_size; 935 u64 sectors, clusters, mlcn, mlcn2, dev_size0; 936 struct NTFS_BOOT *boot; 937 struct buffer_head *bh; 938 struct MFT_REC *rec; 939 u16 fn, ao; 940 u8 cluster_bits; 941 u32 boot_off = 0; 942 sector_t boot_block = 0; 943 const char *hint = "Primary boot"; 944 945 /* Save original dev_size. Used with alternative boot. */ 946 dev_size0 = dev_size; 947 948 sbi->volume.blocks = dev_size >> PAGE_SHIFT; 949 950 /* Set dummy blocksize to read boot_block. */ 951 if (!sb_min_blocksize(sb, PAGE_SIZE)) { 952 return -EINVAL; 953 } 954 955 read_boot: 956 bh = ntfs_bread(sb, boot_block); 957 if (!bh) 958 return boot_block ? -EINVAL : -EIO; 959 960 err = -EINVAL; 961 962 /* Corrupted image; do not read OOB */ 963 if (bh->b_size - sizeof(*boot) < boot_off) 964 goto out; 965 966 boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off); 967 968 if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) { 969 ntfs_err(sb, "%s signature is not NTFS.", hint); 970 goto out; 971 } 972 973 /* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/ 974 /*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1]) 975 * goto out; 976 */ 977 978 boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) | 979 boot->bytes_per_sector[0]; 980 if (boot_sector_size < SECTOR_SIZE || 981 !is_power_of_2(boot_sector_size)) { 982 ntfs_err(sb, "%s: invalid bytes per sector %u.", hint, 983 boot_sector_size); 984 goto out; 985 } 986 987 /* cluster size: 512, 1K, 2K, 4K, ... 2M */ 988 sct_per_clst = true_sectors_per_clst(boot); 989 if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) { 990 ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint, 991 sct_per_clst); 992 goto out; 993 } 994 995 sbi->cluster_size = boot_sector_size * sct_per_clst; 996 sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size); 997 sbi->cluster_mask = sbi->cluster_size - 1; 998 sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask; 999 1000 mlcn = le64_to_cpu(boot->mft_clst); 1001 mlcn2 = le64_to_cpu(boot->mft2_clst); 1002 sectors = le64_to_cpu(boot->sectors_per_volume); 1003 1004 if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) { 1005 ntfs_err( 1006 sb, 1007 "%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.", 1008 hint, mlcn, mlcn2, sectors); 1009 goto out; 1010 } 1011 1012 if (boot->record_size >= 0) { 1013 record_size = (u32)boot->record_size << cluster_bits; 1014 } else if (-boot->record_size <= MAXIMUM_SHIFT_BYTES_PER_MFT) { 1015 record_size = 1u << (-boot->record_size); 1016 } else { 1017 ntfs_err(sb, "%s: invalid record size %d.", hint, 1018 boot->record_size); 1019 goto out; 1020 } 1021 1022 sbi->record_size = record_size; 1023 sbi->record_bits = blksize_bits(record_size); 1024 sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes 1025 1026 /* Check MFT record size. */ 1027 if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) { 1028 ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint, 1029 record_size, boot->record_size); 1030 goto out; 1031 } 1032 1033 if (record_size > MAXIMUM_BYTES_PER_MFT) { 1034 ntfs_err(sb, "Unsupported bytes per MFT record %u.", 1035 record_size); 1036 goto out; 1037 } 1038 1039 if (boot->index_size >= 0) { 1040 sbi->index_size = (u32)boot->index_size << cluster_bits; 1041 } else if (-boot->index_size <= MAXIMUM_SHIFT_BYTES_PER_INDEX) { 1042 sbi->index_size = 1u << (-boot->index_size); 1043 } else { 1044 ntfs_err(sb, "%s: invalid index size %d.", hint, 1045 boot->index_size); 1046 goto out; 1047 } 1048 1049 /* Check index record size. */ 1050 if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) { 1051 ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint, 1052 sbi->index_size, boot->index_size); 1053 goto out; 1054 } 1055 1056 if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) { 1057 ntfs_err(sb, "%s: unsupported bytes per index %u.", hint, 1058 sbi->index_size); 1059 goto out; 1060 } 1061 1062 sbi->volume.size = sectors * boot_sector_size; 1063 1064 gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb); 1065 1066 /* 1067 * - Volume formatted and mounted with the same sector size. 1068 * - Volume formatted 4K and mounted as 512. 1069 * - Volume formatted 512 and mounted as 4K. 1070 */ 1071 if (boot_sector_size != sector_size) { 1072 ntfs_warn( 1073 sb, 1074 "Different NTFS sector size (%u) and media sector size (%u).", 1075 boot_sector_size, sector_size); 1076 dev_size += sector_size - 1; 1077 } 1078 1079 sbi->bdev_blocksize_mask = max(boot_sector_size, sector_size) - 1; 1080 sbi->mft.lbo = mlcn << cluster_bits; 1081 sbi->mft.lbo2 = mlcn2 << cluster_bits; 1082 1083 /* Compare boot's cluster and sector. */ 1084 if (sbi->cluster_size < boot_sector_size) { 1085 ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint, 1086 sbi->cluster_size); 1087 goto out; 1088 } 1089 1090 /* Compare boot's cluster and media sector. */ 1091 if (sbi->cluster_size < sector_size) { 1092 /* No way to use ntfs_get_block in this case. */ 1093 ntfs_err( 1094 sb, 1095 "Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).", 1096 sbi->cluster_size, sector_size); 1097 goto out; 1098 } 1099 1100 sbi->max_bytes_per_attr = 1101 record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) - 1102 ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) - 1103 ALIGN(sizeof(enum ATTR_TYPE), 8); 1104 1105 sbi->volume.ser_num = le64_to_cpu(boot->serial_num); 1106 1107 /* Warning if RAW volume. */ 1108 if (dev_size < sbi->volume.size + boot_sector_size) { 1109 u32 mb0, gb0; 1110 1111 gb0 = format_size_gb(dev_size, &mb0); 1112 ntfs_warn( 1113 sb, 1114 "RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.", 1115 gb, mb, gb0, mb0); 1116 sb->s_flags |= SB_RDONLY; 1117 } 1118 1119 clusters = sbi->volume.size >> cluster_bits; 1120 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1121 /* 32 bits per cluster. */ 1122 if (clusters >> 32) { 1123 ntfs_notice( 1124 sb, 1125 "NTFS %u.%02u Gb is too big to use 32 bits per cluster.", 1126 gb, mb); 1127 goto out; 1128 } 1129 #elif BITS_PER_LONG < 64 1130 #error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS" 1131 #endif 1132 1133 sbi->used.bitmap.nbits = clusters; 1134 1135 rec = kzalloc(record_size, GFP_NOFS); 1136 if (!rec) { 1137 err = -ENOMEM; 1138 goto out; 1139 } 1140 1141 sbi->new_rec = rec; 1142 rec->rhdr.sign = NTFS_FILE_SIGNATURE; 1143 rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET); 1144 fn = (sbi->record_size >> SECTOR_SHIFT) + 1; 1145 rec->rhdr.fix_num = cpu_to_le16(fn); 1146 ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8); 1147 rec->attr_off = cpu_to_le16(ao); 1148 rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8)); 1149 rec->total = cpu_to_le32(sbi->record_size); 1150 ((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END; 1151 1152 sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE)); 1153 1154 sbi->block_mask = sb->s_blocksize - 1; 1155 sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits; 1156 sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits; 1157 1158 /* Maximum size for normal files. */ 1159 sbi->maxbytes = (clusters << cluster_bits) - 1; 1160 1161 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1162 if (clusters >= (1ull << (64 - cluster_bits))) 1163 sbi->maxbytes = -1; 1164 sbi->maxbytes_sparse = -1; 1165 sb->s_maxbytes = MAX_LFS_FILESIZE; 1166 #else 1167 /* Maximum size for sparse file. */ 1168 sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1; 1169 sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits; 1170 #endif 1171 1172 /* 1173 * Compute the MFT zone at two steps. 1174 * It would be nice if we are able to allocate 1/8 of 1175 * total clusters for MFT but not more then 512 MB. 1176 */ 1177 sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3); 1178 1179 err = 0; 1180 1181 if (bh->b_blocknr && !sb_rdonly(sb)) { 1182 /* 1183 * Alternative boot is ok but primary is not ok. 1184 * Do not update primary boot here 'cause it may be faked boot. 1185 * Let ntfs to be mounted and update boot later. 1186 */ 1187 *boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN); 1188 } 1189 1190 out: 1191 brelse(bh); 1192 1193 if (err == -EINVAL && !boot_block && dev_size0 > PAGE_SHIFT) { 1194 u32 block_size = min_t(u32, sector_size, PAGE_SIZE); 1195 u64 lbo = dev_size0 - sizeof(*boot); 1196 1197 boot_block = lbo >> blksize_bits(block_size); 1198 boot_off = lbo & (block_size - 1); 1199 if (boot_block && block_size >= boot_off + sizeof(*boot)) { 1200 /* 1201 * Try alternative boot (last sector) 1202 */ 1203 sb_set_blocksize(sb, block_size); 1204 hint = "Alternative boot"; 1205 dev_size = dev_size0; /* restore original size. */ 1206 goto read_boot; 1207 } 1208 } 1209 1210 return err; 1211 } 1212 1213 /* 1214 * ntfs_fill_super - Try to mount. 1215 */ 1216 static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc) 1217 { 1218 int err; 1219 struct ntfs_sb_info *sbi = sb->s_fs_info; 1220 struct block_device *bdev = sb->s_bdev; 1221 struct ntfs_mount_options *fc_opts; 1222 struct ntfs_mount_options *options = NULL; 1223 struct inode *inode; 1224 struct ntfs_inode *ni; 1225 size_t i, tt, bad_len, bad_frags; 1226 CLST vcn, lcn, len; 1227 struct ATTRIB *attr; 1228 const struct VOLUME_INFO *info; 1229 u32 done, bytes; 1230 struct ATTR_DEF_ENTRY *t; 1231 u16 *shared; 1232 struct MFT_REF ref; 1233 bool ro = sb_rdonly(sb); 1234 struct NTFS_BOOT *boot2 = NULL; 1235 1236 ref.high = 0; 1237 1238 sbi->sb = sb; 1239 fc_opts = fc->fs_private; 1240 if (!fc_opts) { 1241 errorf(fc, "missing mount options"); 1242 return -EINVAL; 1243 } 1244 options = kmemdup(fc_opts, sizeof(*fc_opts), GFP_KERNEL); 1245 if (!options) 1246 return -ENOMEM; 1247 1248 if (fc_opts->nls_name) { 1249 options->nls_name = kstrdup(fc_opts->nls_name, GFP_KERNEL); 1250 if (!options->nls_name) { 1251 kfree(options); 1252 return -ENOMEM; 1253 } 1254 } 1255 sbi->options = options; 1256 fc->fs_private = NULL; 1257 sb->s_flags |= SB_NODIRATIME; 1258 sb->s_magic = 0x7366746e; // "ntfs" 1259 sb->s_op = &ntfs_sops; 1260 sb->s_export_op = &ntfs_export_ops; 1261 sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec 1262 sb->s_xattr = ntfs_xattr_handlers; 1263 set_default_d_op(sb, options->nocase ? &ntfs_dentry_ops : NULL); 1264 1265 options->nls = ntfs_load_nls(options->nls_name); 1266 if (IS_ERR(options->nls)) { 1267 options->nls = NULL; 1268 errorf(fc, "Cannot load nls %s", options->nls_name); 1269 err = -EINVAL; 1270 goto out; 1271 } 1272 1273 if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) { 1274 sbi->discard_granularity = bdev_discard_granularity(bdev); 1275 sbi->discard_granularity_mask_inv = 1276 ~(u64)(sbi->discard_granularity - 1); 1277 } 1278 1279 /* Parse boot. */ 1280 err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev), 1281 bdev_nr_bytes(bdev), &boot2); 1282 if (err) 1283 goto out; 1284 1285 /* 1286 * Load $Volume. This should be done before $LogFile 1287 * 'cause 'sbi->volume.ni' is used in 'ntfs_set_state'. 1288 */ 1289 ref.low = cpu_to_le32(MFT_REC_VOL); 1290 ref.seq = cpu_to_le16(MFT_REC_VOL); 1291 inode = ntfs_iget5(sb, &ref, &NAME_VOLUME); 1292 if (IS_ERR(inode)) { 1293 err = PTR_ERR(inode); 1294 ntfs_err(sb, "Failed to load $Volume (%d).", err); 1295 goto out; 1296 } 1297 1298 ni = ntfs_i(inode); 1299 1300 /* Load and save label (not necessary). */ 1301 attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL); 1302 1303 if (!attr) { 1304 /* It is ok if no ATTR_LABEL */ 1305 } else if (!attr->non_res && !is_attr_ext(attr)) { 1306 /* $AttrDef allows labels to be up to 128 symbols. */ 1307 err = utf16s_to_utf8s(resident_data(attr), 1308 le32_to_cpu(attr->res.data_size) >> 1, 1309 UTF16_LITTLE_ENDIAN, sbi->volume.label, 1310 sizeof(sbi->volume.label)); 1311 if (err < 0) 1312 sbi->volume.label[0] = 0; 1313 } else { 1314 /* Should we break mounting here? */ 1315 //err = -EINVAL; 1316 //goto put_inode_out; 1317 } 1318 1319 attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL); 1320 if (!attr || is_attr_ext(attr) || 1321 !(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) { 1322 ntfs_err(sb, "$Volume is corrupted."); 1323 err = -EINVAL; 1324 goto put_inode_out; 1325 } 1326 1327 sbi->volume.major_ver = info->major_ver; 1328 sbi->volume.minor_ver = info->minor_ver; 1329 sbi->volume.flags = info->flags; 1330 sbi->volume.ni = ni; 1331 if (info->flags & VOLUME_FLAG_DIRTY) { 1332 sbi->volume.real_dirty = true; 1333 ntfs_info(sb, "It is recommended to use chkdsk."); 1334 } 1335 1336 /* Load $MFTMirr to estimate recs_mirr. */ 1337 ref.low = cpu_to_le32(MFT_REC_MIRR); 1338 ref.seq = cpu_to_le16(MFT_REC_MIRR); 1339 inode = ntfs_iget5(sb, &ref, &NAME_MIRROR); 1340 if (IS_ERR(inode)) { 1341 err = PTR_ERR(inode); 1342 ntfs_err(sb, "Failed to load $MFTMirr (%d).", err); 1343 goto out; 1344 } 1345 1346 sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >> 1347 sbi->record_bits; 1348 1349 iput(inode); 1350 1351 /* Load LogFile to replay. */ 1352 ref.low = cpu_to_le32(MFT_REC_LOG); 1353 ref.seq = cpu_to_le16(MFT_REC_LOG); 1354 inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE); 1355 if (IS_ERR(inode)) { 1356 err = PTR_ERR(inode); 1357 ntfs_err(sb, "Failed to load \x24LogFile (%d).", err); 1358 goto out; 1359 } 1360 1361 ni = ntfs_i(inode); 1362 1363 err = ntfs_loadlog_and_replay(ni, sbi); 1364 if (err) 1365 goto put_inode_out; 1366 1367 iput(inode); 1368 1369 if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) { 1370 ntfs_warn(sb, "failed to replay log file. Can't mount rw!"); 1371 err = -EINVAL; 1372 goto out; 1373 } 1374 1375 if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) { 1376 ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!"); 1377 err = -EINVAL; 1378 goto out; 1379 } 1380 1381 /* Load $MFT. */ 1382 ref.low = cpu_to_le32(MFT_REC_MFT); 1383 ref.seq = cpu_to_le16(1); 1384 1385 inode = ntfs_iget5(sb, &ref, &NAME_MFT); 1386 if (IS_ERR(inode)) { 1387 err = PTR_ERR(inode); 1388 ntfs_err(sb, "Failed to load $MFT (%d).", err); 1389 goto out; 1390 } 1391 1392 ni = ntfs_i(inode); 1393 1394 sbi->mft.used = ni->i_valid >> sbi->record_bits; 1395 tt = inode->i_size >> sbi->record_bits; 1396 sbi->mft.next_free = MFT_REC_USER; 1397 1398 err = wnd_init(&sbi->mft.bitmap, sb, tt); 1399 if (err) 1400 goto put_inode_out; 1401 1402 err = ni_load_all_mi(ni); 1403 if (err) { 1404 ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err); 1405 goto put_inode_out; 1406 } 1407 1408 sbi->mft.ni = ni; 1409 1410 /* Load $Bitmap. */ 1411 ref.low = cpu_to_le32(MFT_REC_BITMAP); 1412 ref.seq = cpu_to_le16(MFT_REC_BITMAP); 1413 inode = ntfs_iget5(sb, &ref, &NAME_BITMAP); 1414 if (IS_ERR(inode)) { 1415 err = PTR_ERR(inode); 1416 ntfs_err(sb, "Failed to load $Bitmap (%d).", err); 1417 goto out; 1418 } 1419 1420 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1421 if (inode->i_size >> 32) { 1422 err = -EINVAL; 1423 goto put_inode_out; 1424 } 1425 #endif 1426 1427 /* Check bitmap boundary. */ 1428 tt = sbi->used.bitmap.nbits; 1429 if (inode->i_size < ntfs3_bitmap_size(tt)) { 1430 ntfs_err(sb, "$Bitmap is corrupted."); 1431 err = -EINVAL; 1432 goto put_inode_out; 1433 } 1434 1435 err = wnd_init(&sbi->used.bitmap, sb, tt); 1436 if (err) { 1437 ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err); 1438 goto put_inode_out; 1439 } 1440 1441 iput(inode); 1442 1443 /* Compute the MFT zone. */ 1444 err = ntfs_refresh_zone(sbi); 1445 if (err) { 1446 ntfs_err(sb, "Failed to initialize MFT zone (%d).", err); 1447 goto out; 1448 } 1449 1450 /* Load $BadClus. */ 1451 ref.low = cpu_to_le32(MFT_REC_BADCLUST); 1452 ref.seq = cpu_to_le16(MFT_REC_BADCLUST); 1453 inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS); 1454 if (IS_ERR(inode)) { 1455 err = PTR_ERR(inode); 1456 ntfs_err(sb, "Failed to load $BadClus (%d).", err); 1457 goto out; 1458 } 1459 1460 ni = ntfs_i(inode); 1461 bad_len = bad_frags = 0; 1462 for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) { 1463 if (lcn == SPARSE_LCN) 1464 continue; 1465 1466 bad_len += len; 1467 bad_frags += 1; 1468 if (ro) 1469 continue; 1470 1471 if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) { 1472 /* Bad blocks marked as free in bitmap. */ 1473 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 1474 } 1475 } 1476 if (bad_len) { 1477 /* 1478 * Notice about bad blocks. 1479 * In normal cases these blocks are marked as used in bitmap. 1480 * And we never allocate space in it. 1481 */ 1482 ntfs_notice(sb, 1483 "Volume contains %zu bad blocks in %zu fragments.", 1484 bad_len, bad_frags); 1485 } 1486 iput(inode); 1487 1488 /* Load $AttrDef. */ 1489 ref.low = cpu_to_le32(MFT_REC_ATTR); 1490 ref.seq = cpu_to_le16(MFT_REC_ATTR); 1491 inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF); 1492 if (IS_ERR(inode)) { 1493 err = PTR_ERR(inode); 1494 ntfs_err(sb, "Failed to load $AttrDef (%d)", err); 1495 goto out; 1496 } 1497 1498 /* 1499 * Typical $AttrDef contains up to 20 entries. 1500 * Check for extremely large/small size. 1501 */ 1502 if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) || 1503 inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) { 1504 ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).", 1505 inode->i_size); 1506 err = -EINVAL; 1507 goto put_inode_out; 1508 } 1509 1510 bytes = inode->i_size; 1511 sbi->def_table = t = kvmalloc(bytes, GFP_KERNEL); 1512 if (!t) { 1513 err = -ENOMEM; 1514 goto put_inode_out; 1515 } 1516 1517 /* Read the entire file. */ 1518 err = inode_read_data(inode, sbi->def_table, bytes); 1519 if (err) { 1520 ntfs_err(sb, "Failed to read $AttrDef (%d).", err); 1521 goto put_inode_out; 1522 } 1523 1524 if (ATTR_STD != t->type) { 1525 ntfs_err(sb, "$AttrDef is corrupted."); 1526 err = -EINVAL; 1527 goto put_inode_out; 1528 } 1529 1530 t += 1; 1531 sbi->def_entries = 1; 1532 done = sizeof(struct ATTR_DEF_ENTRY); 1533 1534 while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) { 1535 u32 t32 = le32_to_cpu(t->type); 1536 u64 sz = le64_to_cpu(t->max_sz); 1537 1538 if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32) 1539 break; 1540 1541 if (t->type == ATTR_REPARSE) 1542 sbi->reparse.max_size = sz; 1543 else if (t->type == ATTR_EA) 1544 sbi->ea_max_size = sz; 1545 1546 done += sizeof(struct ATTR_DEF_ENTRY); 1547 t += 1; 1548 sbi->def_entries += 1; 1549 } 1550 iput(inode); 1551 1552 /* Load $UpCase. */ 1553 ref.low = cpu_to_le32(MFT_REC_UPCASE); 1554 ref.seq = cpu_to_le16(MFT_REC_UPCASE); 1555 inode = ntfs_iget5(sb, &ref, &NAME_UPCASE); 1556 if (IS_ERR(inode)) { 1557 err = PTR_ERR(inode); 1558 ntfs_err(sb, "Failed to load $UpCase (%d).", err); 1559 goto out; 1560 } 1561 1562 if (inode->i_size != 0x10000 * sizeof(short)) { 1563 err = -EINVAL; 1564 ntfs_err(sb, "$UpCase is corrupted."); 1565 goto put_inode_out; 1566 } 1567 1568 /* Read the entire file. */ 1569 err = inode_read_data(inode, sbi->upcase, 0x10000 * sizeof(short)); 1570 if (err) { 1571 ntfs_err(sb, "Failed to read $UpCase (%d).", err); 1572 goto put_inode_out; 1573 } 1574 1575 #ifdef __BIG_ENDIAN 1576 { 1577 u16 *dst = sbi->upcase; 1578 1579 for (i = 0; i < 0x10000; i++) 1580 __swab16s(dst++); 1581 } 1582 #endif 1583 1584 shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short)); 1585 if (shared && sbi->upcase != shared) { 1586 kvfree(sbi->upcase); 1587 sbi->upcase = shared; 1588 } 1589 1590 iput(inode); 1591 1592 if (is_ntfs3(sbi)) { 1593 /* Load $Secure. */ 1594 err = ntfs_security_init(sbi); 1595 if (err) { 1596 ntfs_err(sb, "Failed to initialize $Secure (%d).", err); 1597 goto out; 1598 } 1599 1600 /* Load $Extend. */ 1601 err = ntfs_extend_init(sbi); 1602 if (err) { 1603 ntfs_warn(sb, "Failed to initialize $Extend."); 1604 goto load_root; 1605 } 1606 1607 /* Load $Extend/$Reparse. */ 1608 err = ntfs_reparse_init(sbi); 1609 if (err) { 1610 ntfs_warn(sb, "Failed to initialize $Extend/$Reparse."); 1611 goto load_root; 1612 } 1613 1614 /* Load $Extend/$ObjId. */ 1615 err = ntfs_objid_init(sbi); 1616 if (err) { 1617 ntfs_warn(sb, "Failed to initialize $Extend/$ObjId."); 1618 goto load_root; 1619 } 1620 } 1621 1622 load_root: 1623 /* Load root. */ 1624 ref.low = cpu_to_le32(MFT_REC_ROOT); 1625 ref.seq = cpu_to_le16(MFT_REC_ROOT); 1626 inode = ntfs_iget5(sb, &ref, &NAME_ROOT); 1627 if (IS_ERR(inode)) { 1628 err = PTR_ERR(inode); 1629 ntfs_err(sb, "Failed to load root (%d).", err); 1630 goto out; 1631 } 1632 1633 /* 1634 * Final check. Looks like this case should never occurs. 1635 */ 1636 if (!inode->i_op) { 1637 err = -EINVAL; 1638 ntfs_err(sb, "Failed to load root (%d).", err); 1639 goto put_inode_out; 1640 } 1641 1642 sb->s_root = d_make_root(inode); 1643 if (!sb->s_root) { 1644 err = -ENOMEM; 1645 goto put_inode_out; 1646 } 1647 1648 if (boot2) { 1649 /* 1650 * Alternative boot is ok but primary is not ok. 1651 * Volume is recognized as NTFS. Update primary boot. 1652 */ 1653 struct buffer_head *bh0 = sb_getblk(sb, 0); 1654 if (bh0) { 1655 if (buffer_locked(bh0)) 1656 __wait_on_buffer(bh0); 1657 1658 lock_buffer(bh0); 1659 memcpy(bh0->b_data, boot2, sizeof(*boot2)); 1660 set_buffer_uptodate(bh0); 1661 mark_buffer_dirty(bh0); 1662 unlock_buffer(bh0); 1663 if (!sync_dirty_buffer(bh0)) 1664 ntfs_warn(sb, "primary boot is updated"); 1665 put_bh(bh0); 1666 } 1667 1668 kfree(boot2); 1669 } 1670 1671 ntfs_create_procdir(sb); 1672 1673 if (is_legacy_ntfs(sb)) 1674 sb->s_flags |= SB_RDONLY; 1675 return 0; 1676 1677 put_inode_out: 1678 iput(inode); 1679 out: 1680 /* sbi->options == options */ 1681 if (options) { 1682 unload_nls(options->nls); 1683 kfree(options->nls_name); 1684 kfree(options); 1685 sbi->options = NULL; 1686 } 1687 1688 ntfs3_put_sbi(sbi); 1689 kfree(boot2); 1690 return err; 1691 } 1692 1693 void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len) 1694 { 1695 struct ntfs_sb_info *sbi = sb->s_fs_info; 1696 struct block_device *bdev = sb->s_bdev; 1697 sector_t devblock = (u64)lcn * sbi->blocks_per_cluster; 1698 unsigned long blocks = (u64)len * sbi->blocks_per_cluster; 1699 unsigned long cnt = 0; 1700 unsigned long limit = global_zone_page_state(NR_FREE_PAGES) 1701 << (PAGE_SHIFT - sb->s_blocksize_bits); 1702 1703 if (limit >= 0x2000) 1704 limit -= 0x1000; 1705 else if (limit < 32) 1706 limit = 32; 1707 else 1708 limit >>= 1; 1709 1710 while (blocks--) { 1711 clean_bdev_aliases(bdev, devblock++, 1); 1712 if (cnt++ >= limit) { 1713 sync_blockdev(bdev); 1714 cnt = 0; 1715 } 1716 } 1717 } 1718 1719 /* 1720 * ntfs_discard - Issue a discard request (trim for SSD). 1721 */ 1722 int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len) 1723 { 1724 int err; 1725 u64 lbo, bytes, start, end; 1726 struct super_block *sb; 1727 1728 if (sbi->used.next_free_lcn == lcn + len) 1729 sbi->used.next_free_lcn = lcn; 1730 1731 if (sbi->flags & NTFS_FLAGS_NODISCARD) 1732 return -EOPNOTSUPP; 1733 1734 if (!sbi->options->discard) 1735 return -EOPNOTSUPP; 1736 1737 lbo = (u64)lcn << sbi->cluster_bits; 1738 bytes = (u64)len << sbi->cluster_bits; 1739 1740 /* Align up 'start' on discard_granularity. */ 1741 start = (lbo + sbi->discard_granularity - 1) & 1742 sbi->discard_granularity_mask_inv; 1743 /* Align down 'end' on discard_granularity. */ 1744 end = (lbo + bytes) & sbi->discard_granularity_mask_inv; 1745 1746 sb = sbi->sb; 1747 if (start >= end) 1748 return 0; 1749 1750 err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9, 1751 GFP_NOFS); 1752 1753 if (err == -EOPNOTSUPP) 1754 sbi->flags |= NTFS_FLAGS_NODISCARD; 1755 1756 return err; 1757 } 1758 1759 static int ntfs_fs_get_tree(struct fs_context *fc) 1760 { 1761 return get_tree_bdev(fc, ntfs_fill_super); 1762 } 1763 1764 /* 1765 * ntfs_fs_free - Free fs_context. 1766 * 1767 * Note that this will be called after fill_super and reconfigure 1768 * even when they pass. So they have to take pointers if they pass. 1769 */ 1770 static void ntfs_fs_free(struct fs_context *fc) 1771 { 1772 struct ntfs_mount_options *opts = fc->fs_private; 1773 struct ntfs_sb_info *sbi = fc->s_fs_info; 1774 1775 if (sbi) { 1776 ntfs3_put_sbi(sbi); 1777 ntfs3_free_sbi(sbi); 1778 } 1779 1780 if (opts) 1781 put_mount_options(opts); 1782 } 1783 1784 // clang-format off 1785 static const struct fs_context_operations ntfs_context_ops = { 1786 .parse_param = ntfs_fs_parse_param, 1787 .get_tree = ntfs_fs_get_tree, 1788 .reconfigure = ntfs_fs_reconfigure, 1789 .free = ntfs_fs_free, 1790 }; 1791 // clang-format on 1792 1793 /* 1794 * ntfs_init_fs_context - Initialize sbi and opts 1795 * 1796 * This will called when mount/remount. We will first initialize 1797 * options so that if remount we can use just that. 1798 */ 1799 static int __ntfs_init_fs_context(struct fs_context *fc) 1800 { 1801 struct ntfs_mount_options *opts; 1802 struct ntfs_sb_info *sbi; 1803 1804 opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS); 1805 if (!opts) 1806 return -ENOMEM; 1807 1808 /* Default options. */ 1809 opts->fs_uid = current_uid(); 1810 opts->fs_gid = current_gid(); 1811 opts->fs_fmask_inv = ~current_umask(); 1812 opts->fs_dmask_inv = ~current_umask(); 1813 opts->prealloc = 1; 1814 1815 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1816 /* Set the default value 'acl' */ 1817 fc->sb_flags |= SB_POSIXACL; 1818 #endif 1819 1820 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) 1821 goto ok; 1822 1823 sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS); 1824 if (!sbi) 1825 goto free_opts; 1826 1827 sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL); 1828 if (!sbi->upcase) 1829 goto free_sbi; 1830 1831 ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL, 1832 DEFAULT_RATELIMIT_BURST); 1833 1834 mutex_init(&sbi->compress.mtx_lznt); 1835 #ifdef CONFIG_NTFS3_LZX_XPRESS 1836 mutex_init(&sbi->compress.mtx_xpress); 1837 mutex_init(&sbi->compress.mtx_lzx); 1838 #endif 1839 1840 fc->s_fs_info = sbi; 1841 ok: 1842 fc->fs_private = opts; 1843 fc->ops = &ntfs_context_ops; 1844 1845 return 0; 1846 free_sbi: 1847 kfree(sbi); 1848 free_opts: 1849 kfree(opts); 1850 return -ENOMEM; 1851 } 1852 1853 static int ntfs_init_fs_context(struct fs_context *fc) 1854 { 1855 return __ntfs_init_fs_context(fc); 1856 } 1857 1858 static void ntfs3_kill_sb(struct super_block *sb) 1859 { 1860 struct ntfs_sb_info *sbi = sb->s_fs_info; 1861 1862 kill_block_super(sb); 1863 1864 if (sbi->options) 1865 put_mount_options(sbi->options); 1866 ntfs3_free_sbi(sbi); 1867 } 1868 1869 // clang-format off 1870 static struct file_system_type ntfs_fs_type = { 1871 .owner = THIS_MODULE, 1872 .name = "ntfs3", 1873 .init_fs_context = ntfs_init_fs_context, 1874 .parameters = ntfs_fs_parameters, 1875 .kill_sb = ntfs3_kill_sb, 1876 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1877 }; 1878 1879 #if IS_ENABLED(CONFIG_NTFS_FS) 1880 static int ntfs_legacy_init_fs_context(struct fs_context *fc) 1881 { 1882 int ret; 1883 1884 ret = __ntfs_init_fs_context(fc); 1885 /* If ntfs3 is used as legacy ntfs enforce read-only mode. */ 1886 fc->sb_flags |= SB_RDONLY; 1887 return ret; 1888 } 1889 1890 static struct file_system_type ntfs_legacy_fs_type = { 1891 .owner = THIS_MODULE, 1892 .name = "ntfs", 1893 .init_fs_context = ntfs_legacy_init_fs_context, 1894 .parameters = ntfs_fs_parameters, 1895 .kill_sb = ntfs3_kill_sb, 1896 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1897 }; 1898 MODULE_ALIAS_FS("ntfs"); 1899 1900 static inline void register_as_ntfs_legacy(void) 1901 { 1902 int err = register_filesystem(&ntfs_legacy_fs_type); 1903 if (err) 1904 pr_warn("ntfs3: Failed to register legacy ntfs filesystem driver: %d\n", err); 1905 } 1906 1907 static inline void unregister_as_ntfs_legacy(void) 1908 { 1909 unregister_filesystem(&ntfs_legacy_fs_type); 1910 } 1911 bool is_legacy_ntfs(struct super_block *sb) 1912 { 1913 return sb->s_type == &ntfs_legacy_fs_type; 1914 } 1915 #else 1916 static inline void register_as_ntfs_legacy(void) {} 1917 static inline void unregister_as_ntfs_legacy(void) {} 1918 #endif 1919 1920 // clang-format on 1921 1922 static int __init init_ntfs_fs(void) 1923 { 1924 int err; 1925 1926 if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL)) 1927 pr_info("ntfs3: Enabled Linux POSIX ACLs support\n"); 1928 if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER)) 1929 pr_notice( 1930 "ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n"); 1931 if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS)) 1932 pr_info("ntfs3: Read-only LZX/Xpress compression included\n"); 1933 1934 ntfs_create_proc_root(); 1935 1936 err = ntfs3_init_bitmap(); 1937 if (err) 1938 goto out2; 1939 1940 ntfs_inode_cachep = kmem_cache_create( 1941 "ntfs_inode_cache", sizeof(struct ntfs_inode), 0, 1942 (SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT), init_once); 1943 if (!ntfs_inode_cachep) { 1944 err = -ENOMEM; 1945 goto out1; 1946 } 1947 1948 register_as_ntfs_legacy(); 1949 err = register_filesystem(&ntfs_fs_type); 1950 if (err) 1951 goto out; 1952 1953 return 0; 1954 out: 1955 kmem_cache_destroy(ntfs_inode_cachep); 1956 out1: 1957 ntfs3_exit_bitmap(); 1958 out2: 1959 ntfs_remove_proc_root(); 1960 return err; 1961 } 1962 1963 static void __exit exit_ntfs_fs(void) 1964 { 1965 rcu_barrier(); 1966 kmem_cache_destroy(ntfs_inode_cachep); 1967 unregister_filesystem(&ntfs_fs_type); 1968 unregister_as_ntfs_legacy(); 1969 ntfs3_exit_bitmap(); 1970 ntfs_remove_proc_root(); 1971 } 1972 1973 MODULE_LICENSE("GPL"); 1974 MODULE_DESCRIPTION("ntfs3 read/write filesystem"); 1975 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1976 MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support"); 1977 #endif 1978 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1979 MODULE_INFO( 1980 cluster, 1981 "Warning: Activated 64 bits per cluster. Windows does not support this"); 1982 #endif 1983 #ifdef CONFIG_NTFS3_LZX_XPRESS 1984 MODULE_INFO(compression, "Read-only lzx/xpress compression included"); 1985 #endif 1986 1987 MODULE_AUTHOR("Konstantin Komarov"); 1988 MODULE_ALIAS_FS("ntfs3"); 1989 1990 module_init(init_ntfs_fs); 1991 module_exit(exit_ntfs_fs); 1992