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