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 static void ntfs_create_procdir(struct super_block *sb) 559 { 560 struct proc_dir_entry *e; 561 562 if (!proc_info_root) 563 return; 564 565 e = proc_mkdir(sb->s_id, proc_info_root); 566 if (e) { 567 struct ntfs_sb_info *sbi = sb->s_fs_info; 568 569 proc_create_data("volinfo", 0444, e, 570 &ntfs3_volinfo_fops, sb); 571 proc_create_data("label", 0644, e, 572 &ntfs3_label_fops, sb); 573 sbi->procdir = e; 574 } 575 } 576 577 static void ntfs_remove_procdir(struct super_block *sb) 578 { 579 struct ntfs_sb_info *sbi = sb->s_fs_info; 580 581 if (!sbi->procdir) 582 return; 583 584 remove_proc_entry("label", sbi->procdir); 585 remove_proc_entry("volinfo", sbi->procdir); 586 remove_proc_entry(sb->s_id, proc_info_root); 587 sbi->procdir = NULL; 588 } 589 590 static void ntfs_create_proc_root(void) 591 { 592 proc_info_root = proc_mkdir("fs/ntfs3", NULL); 593 } 594 595 static void ntfs_remove_proc_root(void) 596 { 597 if (proc_info_root) { 598 remove_proc_entry("fs/ntfs3", NULL); 599 proc_info_root = NULL; 600 } 601 } 602 #else 603 static void ntfs_create_procdir(struct super_block *sb) {} 604 static void ntfs_remove_procdir(struct super_block *sb) {} 605 static void ntfs_create_proc_root(void) {} 606 static void ntfs_remove_proc_root(void) {} 607 #endif 608 609 static struct kmem_cache *ntfs_inode_cachep; 610 611 static struct inode *ntfs_alloc_inode(struct super_block *sb) 612 { 613 struct ntfs_inode *ni = alloc_inode_sb(sb, ntfs_inode_cachep, GFP_NOFS); 614 615 if (!ni) 616 return NULL; 617 618 memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode)); 619 mutex_init(&ni->ni_lock); 620 return &ni->vfs_inode; 621 } 622 623 static void ntfs_free_inode(struct inode *inode) 624 { 625 struct ntfs_inode *ni = ntfs_i(inode); 626 627 mutex_destroy(&ni->ni_lock); 628 kmem_cache_free(ntfs_inode_cachep, ni); 629 } 630 631 static void init_once(void *foo) 632 { 633 struct ntfs_inode *ni = foo; 634 635 inode_init_once(&ni->vfs_inode); 636 } 637 638 /* 639 * Noinline to reduce binary size. 640 */ 641 static noinline void ntfs3_put_sbi(struct ntfs_sb_info *sbi) 642 { 643 wnd_close(&sbi->mft.bitmap); 644 wnd_close(&sbi->used.bitmap); 645 646 if (sbi->mft.ni) { 647 iput(&sbi->mft.ni->vfs_inode); 648 sbi->mft.ni = NULL; 649 } 650 651 if (sbi->security.ni) { 652 iput(&sbi->security.ni->vfs_inode); 653 sbi->security.ni = NULL; 654 } 655 656 if (sbi->reparse.ni) { 657 iput(&sbi->reparse.ni->vfs_inode); 658 sbi->reparse.ni = NULL; 659 } 660 661 if (sbi->objid.ni) { 662 iput(&sbi->objid.ni->vfs_inode); 663 sbi->objid.ni = NULL; 664 } 665 666 if (sbi->volume.ni) { 667 iput(&sbi->volume.ni->vfs_inode); 668 sbi->volume.ni = NULL; 669 } 670 671 ntfs_update_mftmirr(sbi, 0); 672 673 indx_clear(&sbi->security.index_sii); 674 indx_clear(&sbi->security.index_sdh); 675 indx_clear(&sbi->reparse.index_r); 676 indx_clear(&sbi->objid.index_o); 677 } 678 679 static void ntfs3_free_sbi(struct ntfs_sb_info *sbi) 680 { 681 kfree(sbi->new_rec); 682 kvfree(ntfs_put_shared(sbi->upcase)); 683 kvfree(sbi->def_table); 684 kfree(sbi->compress.lznt); 685 #ifdef CONFIG_NTFS3_LZX_XPRESS 686 xpress_free_decompressor(sbi->compress.xpress); 687 lzx_free_decompressor(sbi->compress.lzx); 688 #endif 689 kfree(sbi); 690 } 691 692 static void ntfs_put_super(struct super_block *sb) 693 { 694 struct ntfs_sb_info *sbi = sb->s_fs_info; 695 696 ntfs_remove_procdir(sb); 697 698 /* Mark rw ntfs as clear, if possible. */ 699 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 700 ntfs3_put_sbi(sbi); 701 } 702 703 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf) 704 { 705 struct super_block *sb = dentry->d_sb; 706 struct ntfs_sb_info *sbi = sb->s_fs_info; 707 struct wnd_bitmap *wnd = &sbi->used.bitmap; 708 709 buf->f_type = sb->s_magic; 710 buf->f_bsize = sbi->cluster_size; 711 buf->f_blocks = wnd->nbits; 712 713 buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd); 714 buf->f_fsid.val[0] = sbi->volume.ser_num; 715 buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32); 716 buf->f_namelen = NTFS_NAME_LEN; 717 718 return 0; 719 } 720 721 static int ntfs_show_options(struct seq_file *m, struct dentry *root) 722 { 723 struct super_block *sb = root->d_sb; 724 struct ntfs_sb_info *sbi = sb->s_fs_info; 725 struct ntfs_mount_options *opts = sbi->options; 726 struct user_namespace *user_ns = seq_user_ns(m); 727 728 seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid)); 729 seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid)); 730 if (opts->dmask) 731 seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff); 732 if (opts->fmask) 733 seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff); 734 if (opts->sys_immutable) 735 seq_puts(m, ",sys_immutable"); 736 if (opts->discard) 737 seq_puts(m, ",discard"); 738 if (opts->force) 739 seq_puts(m, ",force"); 740 if (opts->sparse) 741 seq_puts(m, ",sparse"); 742 if (opts->nohidden) 743 seq_puts(m, ",nohidden"); 744 if (opts->hide_dot_files) 745 seq_puts(m, ",hide_dot_files"); 746 if (opts->windows_names) 747 seq_puts(m, ",windows_names"); 748 if (opts->showmeta) 749 seq_puts(m, ",showmeta"); 750 if (sb->s_flags & SB_POSIXACL) 751 seq_puts(m, ",acl"); 752 if (opts->nls) 753 seq_printf(m, ",iocharset=%s", opts->nls->charset); 754 else 755 seq_puts(m, ",iocharset=utf8"); 756 if (opts->prealloc) 757 seq_puts(m, ",prealloc"); 758 if (opts->nocase) 759 seq_puts(m, ",nocase"); 760 761 return 0; 762 } 763 764 /* 765 * ntfs_shutdown - super_operations::shutdown 766 */ 767 static void ntfs_shutdown(struct super_block *sb) 768 { 769 set_bit(NTFS_FLAGS_SHUTDOWN_BIT, &ntfs_sb(sb)->flags); 770 } 771 772 /* 773 * ntfs_sync_fs - super_operations::sync_fs 774 */ 775 static int ntfs_sync_fs(struct super_block *sb, int wait) 776 { 777 int err = 0, err2; 778 struct ntfs_sb_info *sbi = sb->s_fs_info; 779 struct ntfs_inode *ni; 780 struct inode *inode; 781 782 if (unlikely(ntfs3_forced_shutdown(sb))) 783 return -EIO; 784 785 ni = sbi->security.ni; 786 if (ni) { 787 inode = &ni->vfs_inode; 788 err2 = _ni_write_inode(inode, wait); 789 if (err2 && !err) 790 err = err2; 791 } 792 793 ni = sbi->objid.ni; 794 if (ni) { 795 inode = &ni->vfs_inode; 796 err2 = _ni_write_inode(inode, wait); 797 if (err2 && !err) 798 err = err2; 799 } 800 801 ni = sbi->reparse.ni; 802 if (ni) { 803 inode = &ni->vfs_inode; 804 err2 = _ni_write_inode(inode, wait); 805 if (err2 && !err) 806 err = err2; 807 } 808 809 if (!err) 810 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 811 812 ntfs_update_mftmirr(sbi, wait); 813 814 return err; 815 } 816 817 static const struct super_operations ntfs_sops = { 818 .alloc_inode = ntfs_alloc_inode, 819 .free_inode = ntfs_free_inode, 820 .evict_inode = ntfs_evict_inode, 821 .put_super = ntfs_put_super, 822 .statfs = ntfs_statfs, 823 .show_options = ntfs_show_options, 824 .shutdown = ntfs_shutdown, 825 .sync_fs = ntfs_sync_fs, 826 .write_inode = ntfs3_write_inode, 827 }; 828 829 static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino, 830 u32 generation) 831 { 832 struct MFT_REF ref; 833 struct inode *inode; 834 835 ref.low = cpu_to_le32(ino); 836 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 837 ref.high = cpu_to_le16(ino >> 32); 838 #else 839 ref.high = 0; 840 #endif 841 ref.seq = cpu_to_le16(generation); 842 843 inode = ntfs_iget5(sb, &ref, NULL); 844 if (!IS_ERR(inode) && is_bad_inode(inode)) { 845 iput(inode); 846 inode = ERR_PTR(-ESTALE); 847 } 848 849 return inode; 850 } 851 852 static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid, 853 int fh_len, int fh_type) 854 { 855 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 856 ntfs_export_get_inode); 857 } 858 859 static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid, 860 int fh_len, int fh_type) 861 { 862 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 863 ntfs_export_get_inode); 864 } 865 866 /* TODO: == ntfs_sync_inode */ 867 static int ntfs_nfs_commit_metadata(struct inode *inode) 868 { 869 return _ni_write_inode(inode, 1); 870 } 871 872 static const struct export_operations ntfs_export_ops = { 873 .encode_fh = generic_encode_ino32_fh, 874 .fh_to_dentry = ntfs_fh_to_dentry, 875 .fh_to_parent = ntfs_fh_to_parent, 876 .get_parent = ntfs3_get_parent, 877 .commit_metadata = ntfs_nfs_commit_metadata, 878 }; 879 880 /* 881 * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb". 882 */ 883 static u32 format_size_gb(const u64 bytes, u32 *mb) 884 { 885 /* Do simple right 30 bit shift of 64 bit value. */ 886 u64 kbytes = bytes >> 10; 887 u32 kbytes32 = kbytes; 888 889 *mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20; 890 if (*mb >= 100) 891 *mb = 99; 892 893 return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12); 894 } 895 896 static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot) 897 { 898 if (boot->sectors_per_clusters <= 0x80) 899 return boot->sectors_per_clusters; 900 if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */ 901 return 1U << (-(s8)boot->sectors_per_clusters); 902 return -EINVAL; 903 } 904 905 /* 906 * ntfs_init_from_boot - Init internal info from on-disk boot sector. 907 * 908 * NTFS mount begins from boot - special formatted 512 bytes. 909 * There are two boots: the first and the last 512 bytes of volume. 910 * The content of boot is not changed during ntfs life. 911 * 912 * NOTE: ntfs.sys checks only first (primary) boot. 913 * chkdsk checks both boots. 914 */ 915 static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, 916 u64 dev_size, struct NTFS_BOOT **boot2) 917 { 918 struct ntfs_sb_info *sbi = sb->s_fs_info; 919 int err; 920 u32 mb, gb, boot_sector_size, sct_per_clst, record_size; 921 u64 sectors, clusters, mlcn, mlcn2, dev_size0; 922 struct NTFS_BOOT *boot; 923 struct buffer_head *bh; 924 struct MFT_REC *rec; 925 u16 fn, ao; 926 u8 cluster_bits; 927 u32 boot_off = 0; 928 sector_t boot_block = 0; 929 const char *hint = "Primary boot"; 930 931 /* Save original dev_size. Used with alternative boot. */ 932 dev_size0 = dev_size; 933 934 sbi->volume.blocks = dev_size >> PAGE_SHIFT; 935 936 read_boot: 937 bh = ntfs_bread(sb, boot_block); 938 if (!bh) 939 return boot_block ? -EINVAL : -EIO; 940 941 err = -EINVAL; 942 943 /* Corrupted image; do not read OOB */ 944 if (bh->b_size - sizeof(*boot) < boot_off) 945 goto out; 946 947 boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off); 948 949 if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) { 950 ntfs_err(sb, "%s signature is not NTFS.", hint); 951 goto out; 952 } 953 954 /* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/ 955 /*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1]) 956 * goto out; 957 */ 958 959 boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) | 960 boot->bytes_per_sector[0]; 961 if (boot_sector_size < SECTOR_SIZE || 962 !is_power_of_2(boot_sector_size)) { 963 ntfs_err(sb, "%s: invalid bytes per sector %u.", hint, 964 boot_sector_size); 965 goto out; 966 } 967 968 /* cluster size: 512, 1K, 2K, 4K, ... 2M */ 969 sct_per_clst = true_sectors_per_clst(boot); 970 if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) { 971 ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint, 972 sct_per_clst); 973 goto out; 974 } 975 976 sbi->cluster_size = boot_sector_size * sct_per_clst; 977 sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size); 978 sbi->cluster_mask = sbi->cluster_size - 1; 979 sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask; 980 981 mlcn = le64_to_cpu(boot->mft_clst); 982 mlcn2 = le64_to_cpu(boot->mft2_clst); 983 sectors = le64_to_cpu(boot->sectors_per_volume); 984 985 if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) { 986 ntfs_err( 987 sb, 988 "%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.", 989 hint, mlcn, mlcn2, sectors); 990 goto out; 991 } 992 993 if (boot->record_size >= 0) { 994 record_size = (u32)boot->record_size << cluster_bits; 995 } else if (-boot->record_size <= MAXIMUM_SHIFT_BYTES_PER_MFT) { 996 record_size = 1u << (-boot->record_size); 997 } else { 998 ntfs_err(sb, "%s: invalid record size %d.", hint, 999 boot->record_size); 1000 goto out; 1001 } 1002 1003 sbi->record_size = record_size; 1004 sbi->record_bits = blksize_bits(record_size); 1005 sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes 1006 1007 /* Check MFT record size. */ 1008 if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) { 1009 ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint, 1010 record_size, boot->record_size); 1011 goto out; 1012 } 1013 1014 if (record_size > MAXIMUM_BYTES_PER_MFT) { 1015 ntfs_err(sb, "Unsupported bytes per MFT record %u.", 1016 record_size); 1017 goto out; 1018 } 1019 1020 if (boot->index_size >= 0) { 1021 sbi->index_size = (u32)boot->index_size << cluster_bits; 1022 } else if (-boot->index_size <= MAXIMUM_SHIFT_BYTES_PER_INDEX) { 1023 sbi->index_size = 1u << (-boot->index_size); 1024 } else { 1025 ntfs_err(sb, "%s: invalid index size %d.", hint, 1026 boot->index_size); 1027 goto out; 1028 } 1029 1030 /* Check index record size. */ 1031 if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) { 1032 ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint, 1033 sbi->index_size, boot->index_size); 1034 goto out; 1035 } 1036 1037 if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) { 1038 ntfs_err(sb, "%s: unsupported bytes per index %u.", hint, 1039 sbi->index_size); 1040 goto out; 1041 } 1042 1043 sbi->volume.size = sectors * boot_sector_size; 1044 1045 gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb); 1046 1047 /* 1048 * - Volume formatted and mounted with the same sector size. 1049 * - Volume formatted 4K and mounted as 512. 1050 * - Volume formatted 512 and mounted as 4K. 1051 */ 1052 if (boot_sector_size != sector_size) { 1053 ntfs_warn( 1054 sb, 1055 "Different NTFS sector size (%u) and media sector size (%u).", 1056 boot_sector_size, sector_size); 1057 dev_size += sector_size - 1; 1058 } 1059 1060 sbi->mft.lbo = mlcn << cluster_bits; 1061 sbi->mft.lbo2 = mlcn2 << cluster_bits; 1062 1063 /* Compare boot's cluster and sector. */ 1064 if (sbi->cluster_size < boot_sector_size) { 1065 ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint, 1066 sbi->cluster_size); 1067 goto out; 1068 } 1069 1070 /* Compare boot's cluster and media sector. */ 1071 if (sbi->cluster_size < sector_size) { 1072 /* No way to use ntfs_get_block in this case. */ 1073 ntfs_err( 1074 sb, 1075 "Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).", 1076 sbi->cluster_size, sector_size); 1077 goto out; 1078 } 1079 1080 sbi->max_bytes_per_attr = 1081 record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) - 1082 ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) - 1083 ALIGN(sizeof(enum ATTR_TYPE), 8); 1084 1085 sbi->volume.ser_num = le64_to_cpu(boot->serial_num); 1086 1087 /* Warning if RAW volume. */ 1088 if (dev_size < sbi->volume.size + boot_sector_size) { 1089 u32 mb0, gb0; 1090 1091 gb0 = format_size_gb(dev_size, &mb0); 1092 ntfs_warn( 1093 sb, 1094 "RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.", 1095 gb, mb, gb0, mb0); 1096 sb->s_flags |= SB_RDONLY; 1097 } 1098 1099 clusters = sbi->volume.size >> cluster_bits; 1100 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1101 /* 32 bits per cluster. */ 1102 if (clusters >> 32) { 1103 ntfs_notice( 1104 sb, 1105 "NTFS %u.%02u Gb is too big to use 32 bits per cluster.", 1106 gb, mb); 1107 goto out; 1108 } 1109 #elif BITS_PER_LONG < 64 1110 #error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS" 1111 #endif 1112 1113 sbi->used.bitmap.nbits = clusters; 1114 1115 rec = kzalloc(record_size, GFP_NOFS); 1116 if (!rec) { 1117 err = -ENOMEM; 1118 goto out; 1119 } 1120 1121 sbi->new_rec = rec; 1122 rec->rhdr.sign = NTFS_FILE_SIGNATURE; 1123 rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET); 1124 fn = (sbi->record_size >> SECTOR_SHIFT) + 1; 1125 rec->rhdr.fix_num = cpu_to_le16(fn); 1126 ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8); 1127 rec->attr_off = cpu_to_le16(ao); 1128 rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8)); 1129 rec->total = cpu_to_le32(sbi->record_size); 1130 ((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END; 1131 1132 sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE)); 1133 1134 sbi->block_mask = sb->s_blocksize - 1; 1135 sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits; 1136 sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits; 1137 1138 /* Maximum size for normal files. */ 1139 sbi->maxbytes = (clusters << cluster_bits) - 1; 1140 1141 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1142 if (clusters >= (1ull << (64 - cluster_bits))) 1143 sbi->maxbytes = -1; 1144 sbi->maxbytes_sparse = -1; 1145 sb->s_maxbytes = MAX_LFS_FILESIZE; 1146 #else 1147 /* Maximum size for sparse file. */ 1148 sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1; 1149 sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits; 1150 #endif 1151 1152 /* 1153 * Compute the MFT zone at two steps. 1154 * It would be nice if we are able to allocate 1/8 of 1155 * total clusters for MFT but not more then 512 MB. 1156 */ 1157 sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3); 1158 1159 err = 0; 1160 1161 if (bh->b_blocknr && !sb_rdonly(sb)) { 1162 /* 1163 * Alternative boot is ok but primary is not ok. 1164 * Do not update primary boot here 'cause it may be faked boot. 1165 * Let ntfs to be mounted and update boot later. 1166 */ 1167 *boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN); 1168 } 1169 1170 out: 1171 brelse(bh); 1172 1173 if (err == -EINVAL && !boot_block && dev_size0 > PAGE_SHIFT) { 1174 u32 block_size = min_t(u32, sector_size, PAGE_SIZE); 1175 u64 lbo = dev_size0 - sizeof(*boot); 1176 1177 boot_block = lbo >> blksize_bits(block_size); 1178 boot_off = lbo & (block_size - 1); 1179 if (boot_block && block_size >= boot_off + sizeof(*boot)) { 1180 /* 1181 * Try alternative boot (last sector) 1182 */ 1183 sb_set_blocksize(sb, block_size); 1184 hint = "Alternative boot"; 1185 dev_size = dev_size0; /* restore original size. */ 1186 goto read_boot; 1187 } 1188 } 1189 1190 return err; 1191 } 1192 1193 /* 1194 * ntfs_fill_super - Try to mount. 1195 */ 1196 static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc) 1197 { 1198 int err; 1199 struct ntfs_sb_info *sbi = sb->s_fs_info; 1200 struct block_device *bdev = sb->s_bdev; 1201 struct ntfs_mount_options *options; 1202 struct inode *inode; 1203 struct ntfs_inode *ni; 1204 size_t i, tt, bad_len, bad_frags; 1205 CLST vcn, lcn, len; 1206 struct ATTRIB *attr; 1207 const struct VOLUME_INFO *info; 1208 u32 done, bytes; 1209 struct ATTR_DEF_ENTRY *t; 1210 u16 *shared; 1211 struct MFT_REF ref; 1212 bool ro = sb_rdonly(sb); 1213 struct NTFS_BOOT *boot2 = NULL; 1214 1215 ref.high = 0; 1216 1217 sbi->sb = sb; 1218 sbi->options = options = fc->fs_private; 1219 fc->fs_private = NULL; 1220 sb->s_flags |= SB_NODIRATIME; 1221 sb->s_magic = 0x7366746e; // "ntfs" 1222 sb->s_op = &ntfs_sops; 1223 sb->s_export_op = &ntfs_export_ops; 1224 sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec 1225 sb->s_xattr = ntfs_xattr_handlers; 1226 sb->s_d_op = options->nocase ? &ntfs_dentry_ops : NULL; 1227 1228 options->nls = ntfs_load_nls(options->nls_name); 1229 if (IS_ERR(options->nls)) { 1230 options->nls = NULL; 1231 errorf(fc, "Cannot load nls %s", options->nls_name); 1232 err = -EINVAL; 1233 goto out; 1234 } 1235 1236 if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) { 1237 sbi->discard_granularity = bdev_discard_granularity(bdev); 1238 sbi->discard_granularity_mask_inv = 1239 ~(u64)(sbi->discard_granularity - 1); 1240 } 1241 1242 /* Parse boot. */ 1243 err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev), 1244 bdev_nr_bytes(bdev), &boot2); 1245 if (err) 1246 goto out; 1247 1248 /* 1249 * Load $Volume. This should be done before $LogFile 1250 * 'cause 'sbi->volume.ni' is used in 'ntfs_set_state'. 1251 */ 1252 ref.low = cpu_to_le32(MFT_REC_VOL); 1253 ref.seq = cpu_to_le16(MFT_REC_VOL); 1254 inode = ntfs_iget5(sb, &ref, &NAME_VOLUME); 1255 if (IS_ERR(inode)) { 1256 err = PTR_ERR(inode); 1257 ntfs_err(sb, "Failed to load $Volume (%d).", err); 1258 goto out; 1259 } 1260 1261 ni = ntfs_i(inode); 1262 1263 /* Load and save label (not necessary). */ 1264 attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL); 1265 1266 if (!attr) { 1267 /* It is ok if no ATTR_LABEL */ 1268 } else if (!attr->non_res && !is_attr_ext(attr)) { 1269 /* $AttrDef allows labels to be up to 128 symbols. */ 1270 err = utf16s_to_utf8s(resident_data(attr), 1271 le32_to_cpu(attr->res.data_size) >> 1, 1272 UTF16_LITTLE_ENDIAN, sbi->volume.label, 1273 sizeof(sbi->volume.label)); 1274 if (err < 0) 1275 sbi->volume.label[0] = 0; 1276 } else { 1277 /* Should we break mounting here? */ 1278 //err = -EINVAL; 1279 //goto put_inode_out; 1280 } 1281 1282 attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL); 1283 if (!attr || is_attr_ext(attr) || 1284 !(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) { 1285 ntfs_err(sb, "$Volume is corrupted."); 1286 err = -EINVAL; 1287 goto put_inode_out; 1288 } 1289 1290 sbi->volume.major_ver = info->major_ver; 1291 sbi->volume.minor_ver = info->minor_ver; 1292 sbi->volume.flags = info->flags; 1293 sbi->volume.ni = ni; 1294 if (info->flags & VOLUME_FLAG_DIRTY) { 1295 sbi->volume.real_dirty = true; 1296 ntfs_info(sb, "It is recommened to use chkdsk."); 1297 } 1298 1299 /* Load $MFTMirr to estimate recs_mirr. */ 1300 ref.low = cpu_to_le32(MFT_REC_MIRR); 1301 ref.seq = cpu_to_le16(MFT_REC_MIRR); 1302 inode = ntfs_iget5(sb, &ref, &NAME_MIRROR); 1303 if (IS_ERR(inode)) { 1304 err = PTR_ERR(inode); 1305 ntfs_err(sb, "Failed to load $MFTMirr (%d).", err); 1306 goto out; 1307 } 1308 1309 sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >> 1310 sbi->record_bits; 1311 1312 iput(inode); 1313 1314 /* Load LogFile to replay. */ 1315 ref.low = cpu_to_le32(MFT_REC_LOG); 1316 ref.seq = cpu_to_le16(MFT_REC_LOG); 1317 inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE); 1318 if (IS_ERR(inode)) { 1319 err = PTR_ERR(inode); 1320 ntfs_err(sb, "Failed to load \x24LogFile (%d).", err); 1321 goto out; 1322 } 1323 1324 ni = ntfs_i(inode); 1325 1326 err = ntfs_loadlog_and_replay(ni, sbi); 1327 if (err) 1328 goto put_inode_out; 1329 1330 iput(inode); 1331 1332 if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) { 1333 ntfs_warn(sb, "failed to replay log file. Can't mount rw!"); 1334 err = -EINVAL; 1335 goto out; 1336 } 1337 1338 if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) { 1339 ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!"); 1340 err = -EINVAL; 1341 goto out; 1342 } 1343 1344 /* Load $MFT. */ 1345 ref.low = cpu_to_le32(MFT_REC_MFT); 1346 ref.seq = cpu_to_le16(1); 1347 1348 inode = ntfs_iget5(sb, &ref, &NAME_MFT); 1349 if (IS_ERR(inode)) { 1350 err = PTR_ERR(inode); 1351 ntfs_err(sb, "Failed to load $MFT (%d).", err); 1352 goto out; 1353 } 1354 1355 ni = ntfs_i(inode); 1356 1357 sbi->mft.used = ni->i_valid >> sbi->record_bits; 1358 tt = inode->i_size >> sbi->record_bits; 1359 sbi->mft.next_free = MFT_REC_USER; 1360 1361 err = wnd_init(&sbi->mft.bitmap, sb, tt); 1362 if (err) 1363 goto put_inode_out; 1364 1365 err = ni_load_all_mi(ni); 1366 if (err) { 1367 ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err); 1368 goto put_inode_out; 1369 } 1370 1371 sbi->mft.ni = ni; 1372 1373 /* Load $Bitmap. */ 1374 ref.low = cpu_to_le32(MFT_REC_BITMAP); 1375 ref.seq = cpu_to_le16(MFT_REC_BITMAP); 1376 inode = ntfs_iget5(sb, &ref, &NAME_BITMAP); 1377 if (IS_ERR(inode)) { 1378 err = PTR_ERR(inode); 1379 ntfs_err(sb, "Failed to load $Bitmap (%d).", err); 1380 goto out; 1381 } 1382 1383 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1384 if (inode->i_size >> 32) { 1385 err = -EINVAL; 1386 goto put_inode_out; 1387 } 1388 #endif 1389 1390 /* Check bitmap boundary. */ 1391 tt = sbi->used.bitmap.nbits; 1392 if (inode->i_size < ntfs3_bitmap_size(tt)) { 1393 ntfs_err(sb, "$Bitmap is corrupted."); 1394 err = -EINVAL; 1395 goto put_inode_out; 1396 } 1397 1398 err = wnd_init(&sbi->used.bitmap, sb, tt); 1399 if (err) { 1400 ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err); 1401 goto put_inode_out; 1402 } 1403 1404 iput(inode); 1405 1406 /* Compute the MFT zone. */ 1407 err = ntfs_refresh_zone(sbi); 1408 if (err) { 1409 ntfs_err(sb, "Failed to initialize MFT zone (%d).", err); 1410 goto out; 1411 } 1412 1413 /* Load $BadClus. */ 1414 ref.low = cpu_to_le32(MFT_REC_BADCLUST); 1415 ref.seq = cpu_to_le16(MFT_REC_BADCLUST); 1416 inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS); 1417 if (IS_ERR(inode)) { 1418 err = PTR_ERR(inode); 1419 ntfs_err(sb, "Failed to load $BadClus (%d).", err); 1420 goto out; 1421 } 1422 1423 ni = ntfs_i(inode); 1424 bad_len = bad_frags = 0; 1425 for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) { 1426 if (lcn == SPARSE_LCN) 1427 continue; 1428 1429 bad_len += len; 1430 bad_frags += 1; 1431 if (ro) 1432 continue; 1433 1434 if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) { 1435 /* Bad blocks marked as free in bitmap. */ 1436 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 1437 } 1438 } 1439 if (bad_len) { 1440 /* 1441 * Notice about bad blocks. 1442 * In normal cases these blocks are marked as used in bitmap. 1443 * And we never allocate space in it. 1444 */ 1445 ntfs_notice(sb, 1446 "Volume contains %zu bad blocks in %zu fragments.", 1447 bad_len, bad_frags); 1448 } 1449 iput(inode); 1450 1451 /* Load $AttrDef. */ 1452 ref.low = cpu_to_le32(MFT_REC_ATTR); 1453 ref.seq = cpu_to_le16(MFT_REC_ATTR); 1454 inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF); 1455 if (IS_ERR(inode)) { 1456 err = PTR_ERR(inode); 1457 ntfs_err(sb, "Failed to load $AttrDef (%d)", err); 1458 goto out; 1459 } 1460 1461 /* 1462 * Typical $AttrDef contains up to 20 entries. 1463 * Check for extremely large/small size. 1464 */ 1465 if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) || 1466 inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) { 1467 ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).", 1468 inode->i_size); 1469 err = -EINVAL; 1470 goto put_inode_out; 1471 } 1472 1473 bytes = inode->i_size; 1474 sbi->def_table = t = kvmalloc(bytes, GFP_KERNEL); 1475 if (!t) { 1476 err = -ENOMEM; 1477 goto put_inode_out; 1478 } 1479 1480 /* Read the entire file. */ 1481 err = inode_read_data(inode, sbi->def_table, bytes); 1482 if (err) { 1483 ntfs_err(sb, "Failed to read $AttrDef (%d).", err); 1484 goto put_inode_out; 1485 } 1486 1487 if (ATTR_STD != t->type) { 1488 ntfs_err(sb, "$AttrDef is corrupted."); 1489 err = -EINVAL; 1490 goto put_inode_out; 1491 } 1492 1493 t += 1; 1494 sbi->def_entries = 1; 1495 done = sizeof(struct ATTR_DEF_ENTRY); 1496 1497 while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) { 1498 u32 t32 = le32_to_cpu(t->type); 1499 u64 sz = le64_to_cpu(t->max_sz); 1500 1501 if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32) 1502 break; 1503 1504 if (t->type == ATTR_REPARSE) 1505 sbi->reparse.max_size = sz; 1506 else if (t->type == ATTR_EA) 1507 sbi->ea_max_size = sz; 1508 1509 done += sizeof(struct ATTR_DEF_ENTRY); 1510 t += 1; 1511 sbi->def_entries += 1; 1512 } 1513 iput(inode); 1514 1515 /* Load $UpCase. */ 1516 ref.low = cpu_to_le32(MFT_REC_UPCASE); 1517 ref.seq = cpu_to_le16(MFT_REC_UPCASE); 1518 inode = ntfs_iget5(sb, &ref, &NAME_UPCASE); 1519 if (IS_ERR(inode)) { 1520 err = PTR_ERR(inode); 1521 ntfs_err(sb, "Failed to load $UpCase (%d).", err); 1522 goto out; 1523 } 1524 1525 if (inode->i_size != 0x10000 * sizeof(short)) { 1526 err = -EINVAL; 1527 ntfs_err(sb, "$UpCase is corrupted."); 1528 goto put_inode_out; 1529 } 1530 1531 /* Read the entire file. */ 1532 err = inode_read_data(inode, sbi->upcase, 0x10000 * sizeof(short)); 1533 if (err) { 1534 ntfs_err(sb, "Failed to read $UpCase (%d).", err); 1535 goto put_inode_out; 1536 } 1537 1538 #ifdef __BIG_ENDIAN 1539 { 1540 u16 *dst = sbi->upcase; 1541 1542 for (i = 0; i < 0x10000; i++) 1543 __swab16s(dst++); 1544 } 1545 #endif 1546 1547 shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short)); 1548 if (shared && sbi->upcase != shared) { 1549 kvfree(sbi->upcase); 1550 sbi->upcase = shared; 1551 } 1552 1553 iput(inode); 1554 1555 if (is_ntfs3(sbi)) { 1556 /* Load $Secure. */ 1557 err = ntfs_security_init(sbi); 1558 if (err) { 1559 ntfs_err(sb, "Failed to initialize $Secure (%d).", err); 1560 goto out; 1561 } 1562 1563 /* Load $Extend. */ 1564 err = ntfs_extend_init(sbi); 1565 if (err) { 1566 ntfs_warn(sb, "Failed to initialize $Extend."); 1567 goto load_root; 1568 } 1569 1570 /* Load $Extend/$Reparse. */ 1571 err = ntfs_reparse_init(sbi); 1572 if (err) { 1573 ntfs_warn(sb, "Failed to initialize $Extend/$Reparse."); 1574 goto load_root; 1575 } 1576 1577 /* Load $Extend/$ObjId. */ 1578 err = ntfs_objid_init(sbi); 1579 if (err) { 1580 ntfs_warn(sb, "Failed to initialize $Extend/$ObjId."); 1581 goto load_root; 1582 } 1583 } 1584 1585 load_root: 1586 /* Load root. */ 1587 ref.low = cpu_to_le32(MFT_REC_ROOT); 1588 ref.seq = cpu_to_le16(MFT_REC_ROOT); 1589 inode = ntfs_iget5(sb, &ref, &NAME_ROOT); 1590 if (IS_ERR(inode)) { 1591 err = PTR_ERR(inode); 1592 ntfs_err(sb, "Failed to load root (%d).", err); 1593 goto out; 1594 } 1595 1596 /* 1597 * Final check. Looks like this case should never occurs. 1598 */ 1599 if (!inode->i_op) { 1600 err = -EINVAL; 1601 ntfs_err(sb, "Failed to load root (%d).", err); 1602 goto put_inode_out; 1603 } 1604 1605 sb->s_root = d_make_root(inode); 1606 if (!sb->s_root) { 1607 err = -ENOMEM; 1608 goto put_inode_out; 1609 } 1610 1611 if (boot2) { 1612 /* 1613 * Alternative boot is ok but primary is not ok. 1614 * Volume is recognized as NTFS. Update primary boot. 1615 */ 1616 struct buffer_head *bh0 = sb_getblk(sb, 0); 1617 if (bh0) { 1618 if (buffer_locked(bh0)) 1619 __wait_on_buffer(bh0); 1620 1621 lock_buffer(bh0); 1622 memcpy(bh0->b_data, boot2, sizeof(*boot2)); 1623 set_buffer_uptodate(bh0); 1624 mark_buffer_dirty(bh0); 1625 unlock_buffer(bh0); 1626 if (!sync_dirty_buffer(bh0)) 1627 ntfs_warn(sb, "primary boot is updated"); 1628 put_bh(bh0); 1629 } 1630 1631 kfree(boot2); 1632 } 1633 1634 ntfs_create_procdir(sb); 1635 1636 if (is_legacy_ntfs(sb)) 1637 sb->s_flags |= SB_RDONLY; 1638 return 0; 1639 1640 put_inode_out: 1641 iput(inode); 1642 out: 1643 ntfs3_put_sbi(sbi); 1644 kfree(boot2); 1645 ntfs3_put_sbi(sbi); 1646 return err; 1647 } 1648 1649 void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len) 1650 { 1651 struct ntfs_sb_info *sbi = sb->s_fs_info; 1652 struct block_device *bdev = sb->s_bdev; 1653 sector_t devblock = (u64)lcn * sbi->blocks_per_cluster; 1654 unsigned long blocks = (u64)len * sbi->blocks_per_cluster; 1655 unsigned long cnt = 0; 1656 unsigned long limit = global_zone_page_state(NR_FREE_PAGES) 1657 << (PAGE_SHIFT - sb->s_blocksize_bits); 1658 1659 if (limit >= 0x2000) 1660 limit -= 0x1000; 1661 else if (limit < 32) 1662 limit = 32; 1663 else 1664 limit >>= 1; 1665 1666 while (blocks--) { 1667 clean_bdev_aliases(bdev, devblock++, 1); 1668 if (cnt++ >= limit) { 1669 sync_blockdev(bdev); 1670 cnt = 0; 1671 } 1672 } 1673 } 1674 1675 /* 1676 * ntfs_discard - Issue a discard request (trim for SSD). 1677 */ 1678 int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len) 1679 { 1680 int err; 1681 u64 lbo, bytes, start, end; 1682 struct super_block *sb; 1683 1684 if (sbi->used.next_free_lcn == lcn + len) 1685 sbi->used.next_free_lcn = lcn; 1686 1687 if (sbi->flags & NTFS_FLAGS_NODISCARD) 1688 return -EOPNOTSUPP; 1689 1690 if (!sbi->options->discard) 1691 return -EOPNOTSUPP; 1692 1693 lbo = (u64)lcn << sbi->cluster_bits; 1694 bytes = (u64)len << sbi->cluster_bits; 1695 1696 /* Align up 'start' on discard_granularity. */ 1697 start = (lbo + sbi->discard_granularity - 1) & 1698 sbi->discard_granularity_mask_inv; 1699 /* Align down 'end' on discard_granularity. */ 1700 end = (lbo + bytes) & sbi->discard_granularity_mask_inv; 1701 1702 sb = sbi->sb; 1703 if (start >= end) 1704 return 0; 1705 1706 err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9, 1707 GFP_NOFS); 1708 1709 if (err == -EOPNOTSUPP) 1710 sbi->flags |= NTFS_FLAGS_NODISCARD; 1711 1712 return err; 1713 } 1714 1715 static int ntfs_fs_get_tree(struct fs_context *fc) 1716 { 1717 return get_tree_bdev(fc, ntfs_fill_super); 1718 } 1719 1720 /* 1721 * ntfs_fs_free - Free fs_context. 1722 * 1723 * Note that this will be called after fill_super and reconfigure 1724 * even when they pass. So they have to take pointers if they pass. 1725 */ 1726 static void ntfs_fs_free(struct fs_context *fc) 1727 { 1728 struct ntfs_mount_options *opts = fc->fs_private; 1729 struct ntfs_sb_info *sbi = fc->s_fs_info; 1730 1731 if (sbi) { 1732 ntfs3_put_sbi(sbi); 1733 ntfs3_free_sbi(sbi); 1734 } 1735 1736 if (opts) 1737 put_mount_options(opts); 1738 } 1739 1740 // clang-format off 1741 static const struct fs_context_operations ntfs_context_ops = { 1742 .parse_param = ntfs_fs_parse_param, 1743 .get_tree = ntfs_fs_get_tree, 1744 .reconfigure = ntfs_fs_reconfigure, 1745 .free = ntfs_fs_free, 1746 }; 1747 // clang-format on 1748 1749 /* 1750 * ntfs_init_fs_context - Initialize sbi and opts 1751 * 1752 * This will called when mount/remount. We will first initialize 1753 * options so that if remount we can use just that. 1754 */ 1755 static int __ntfs_init_fs_context(struct fs_context *fc) 1756 { 1757 struct ntfs_mount_options *opts; 1758 struct ntfs_sb_info *sbi; 1759 1760 opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS); 1761 if (!opts) 1762 return -ENOMEM; 1763 1764 /* Default options. */ 1765 opts->fs_uid = current_uid(); 1766 opts->fs_gid = current_gid(); 1767 opts->fs_fmask_inv = ~current_umask(); 1768 opts->fs_dmask_inv = ~current_umask(); 1769 1770 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) 1771 goto ok; 1772 1773 sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS); 1774 if (!sbi) 1775 goto free_opts; 1776 1777 sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL); 1778 if (!sbi->upcase) 1779 goto free_sbi; 1780 1781 ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL, 1782 DEFAULT_RATELIMIT_BURST); 1783 1784 mutex_init(&sbi->compress.mtx_lznt); 1785 #ifdef CONFIG_NTFS3_LZX_XPRESS 1786 mutex_init(&sbi->compress.mtx_xpress); 1787 mutex_init(&sbi->compress.mtx_lzx); 1788 #endif 1789 1790 fc->s_fs_info = sbi; 1791 ok: 1792 fc->fs_private = opts; 1793 fc->ops = &ntfs_context_ops; 1794 1795 return 0; 1796 free_sbi: 1797 kfree(sbi); 1798 free_opts: 1799 kfree(opts); 1800 return -ENOMEM; 1801 } 1802 1803 static int ntfs_init_fs_context(struct fs_context *fc) 1804 { 1805 return __ntfs_init_fs_context(fc); 1806 } 1807 1808 static void ntfs3_kill_sb(struct super_block *sb) 1809 { 1810 struct ntfs_sb_info *sbi = sb->s_fs_info; 1811 1812 kill_block_super(sb); 1813 1814 if (sbi->options) 1815 put_mount_options(sbi->options); 1816 ntfs3_free_sbi(sbi); 1817 } 1818 1819 // clang-format off 1820 static struct file_system_type ntfs_fs_type = { 1821 .owner = THIS_MODULE, 1822 .name = "ntfs3", 1823 .init_fs_context = ntfs_init_fs_context, 1824 .parameters = ntfs_fs_parameters, 1825 .kill_sb = ntfs3_kill_sb, 1826 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1827 }; 1828 1829 #if IS_ENABLED(CONFIG_NTFS_FS) 1830 static int ntfs_legacy_init_fs_context(struct fs_context *fc) 1831 { 1832 int ret; 1833 1834 ret = __ntfs_init_fs_context(fc); 1835 /* If ntfs3 is used as legacy ntfs enforce read-only mode. */ 1836 fc->sb_flags |= SB_RDONLY; 1837 return ret; 1838 } 1839 1840 static struct file_system_type ntfs_legacy_fs_type = { 1841 .owner = THIS_MODULE, 1842 .name = "ntfs", 1843 .init_fs_context = ntfs_legacy_init_fs_context, 1844 .parameters = ntfs_fs_parameters, 1845 .kill_sb = ntfs3_kill_sb, 1846 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1847 }; 1848 MODULE_ALIAS_FS("ntfs"); 1849 1850 static inline void register_as_ntfs_legacy(void) 1851 { 1852 int err = register_filesystem(&ntfs_legacy_fs_type); 1853 if (err) 1854 pr_warn("ntfs3: Failed to register legacy ntfs filesystem driver: %d\n", err); 1855 } 1856 1857 static inline void unregister_as_ntfs_legacy(void) 1858 { 1859 unregister_filesystem(&ntfs_legacy_fs_type); 1860 } 1861 bool is_legacy_ntfs(struct super_block *sb) 1862 { 1863 return sb->s_type == &ntfs_legacy_fs_type; 1864 } 1865 #else 1866 static inline void register_as_ntfs_legacy(void) {} 1867 static inline void unregister_as_ntfs_legacy(void) {} 1868 #endif 1869 1870 // clang-format on 1871 1872 static int __init init_ntfs_fs(void) 1873 { 1874 int err; 1875 1876 if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL)) 1877 pr_info("ntfs3: Enabled Linux POSIX ACLs support\n"); 1878 if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER)) 1879 pr_notice( 1880 "ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n"); 1881 if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS)) 1882 pr_info("ntfs3: Read-only LZX/Xpress compression included\n"); 1883 1884 ntfs_create_proc_root(); 1885 1886 err = ntfs3_init_bitmap(); 1887 if (err) 1888 goto out2; 1889 1890 ntfs_inode_cachep = kmem_cache_create( 1891 "ntfs_inode_cache", sizeof(struct ntfs_inode), 0, 1892 (SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT), init_once); 1893 if (!ntfs_inode_cachep) { 1894 err = -ENOMEM; 1895 goto out1; 1896 } 1897 1898 register_as_ntfs_legacy(); 1899 err = register_filesystem(&ntfs_fs_type); 1900 if (err) 1901 goto out; 1902 1903 return 0; 1904 out: 1905 kmem_cache_destroy(ntfs_inode_cachep); 1906 out1: 1907 ntfs3_exit_bitmap(); 1908 out2: 1909 ntfs_remove_proc_root(); 1910 return err; 1911 } 1912 1913 static void __exit exit_ntfs_fs(void) 1914 { 1915 rcu_barrier(); 1916 kmem_cache_destroy(ntfs_inode_cachep); 1917 unregister_filesystem(&ntfs_fs_type); 1918 unregister_as_ntfs_legacy(); 1919 ntfs3_exit_bitmap(); 1920 ntfs_remove_proc_root(); 1921 } 1922 1923 MODULE_LICENSE("GPL"); 1924 MODULE_DESCRIPTION("ntfs3 read/write filesystem"); 1925 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1926 MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support"); 1927 #endif 1928 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1929 MODULE_INFO( 1930 cluster, 1931 "Warning: Activated 64 bits per cluster. Windows does not support this"); 1932 #endif 1933 #ifdef CONFIG_NTFS3_LZX_XPRESS 1934 MODULE_INFO(compression, "Read-only lzx/xpress compression included"); 1935 #endif 1936 1937 MODULE_AUTHOR("Konstantin Komarov"); 1938 MODULE_ALIAS_FS("ntfs3"); 1939 1940 module_init(init_ntfs_fs); 1941 module_exit(exit_ntfs_fs); 1942