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 spin_lock(&de->d_lock); 128 snprintf(name, sizeof(s_name_buf), " \"%s\"", 129 de->d_name.name); 130 spin_unlock(&de->d_lock); 131 } else { 132 name[0] = 0; 133 } 134 dput(de); /* Cocci warns if placed in branch "if (de)" */ 135 } 136 137 va_start(args, fmt); 138 139 level = printk_get_level(fmt); 140 vaf.fmt = printk_skip_level(fmt); 141 vaf.va = &args; 142 143 printk("%c%cntfs3: %s: ino=%lx,%s %pV\n", KERN_SOH_ASCII, level, 144 sb->s_id, inode->i_ino, name ? name : "", &vaf); 145 146 va_end(args); 147 148 atomic_inc(&s_name_buf_cnt); 149 if (name != s_name_buf) 150 kfree(name); 151 } 152 #endif 153 154 /* 155 * Shared memory struct. 156 * 157 * On-disk ntfs's upcase table is created by ntfs formatter. 158 * 'upcase' table is 128K bytes of memory. 159 * We should read it into memory when mounting. 160 * Several ntfs volumes likely use the same 'upcase' table. 161 * It is good idea to share in-memory 'upcase' table between different volumes. 162 * Unfortunately winxp/vista/win7 use different upcase tables. 163 */ 164 static DEFINE_SPINLOCK(s_shared_lock); 165 166 static struct { 167 void *ptr; 168 u32 len; 169 int cnt; 170 } s_shared[8]; 171 172 /* 173 * ntfs_set_shared 174 * 175 * Return: 176 * * @ptr - If pointer was saved in shared memory. 177 * * NULL - If pointer was not shared. 178 */ 179 void *ntfs_set_shared(void *ptr, u32 bytes) 180 { 181 void *ret = NULL; 182 int i, j = -1; 183 184 spin_lock(&s_shared_lock); 185 for (i = 0; i < ARRAY_SIZE(s_shared); i++) { 186 if (!s_shared[i].cnt) { 187 j = i; 188 } else if (bytes == s_shared[i].len && 189 !memcmp(s_shared[i].ptr, ptr, bytes)) { 190 s_shared[i].cnt += 1; 191 ret = s_shared[i].ptr; 192 break; 193 } 194 } 195 196 if (!ret && j != -1) { 197 s_shared[j].ptr = ptr; 198 s_shared[j].len = bytes; 199 s_shared[j].cnt = 1; 200 ret = ptr; 201 } 202 spin_unlock(&s_shared_lock); 203 204 return ret; 205 } 206 207 /* 208 * ntfs_put_shared 209 * 210 * Return: 211 * * @ptr - If pointer is not shared anymore. 212 * * NULL - If pointer is still shared. 213 */ 214 void *ntfs_put_shared(void *ptr) 215 { 216 void *ret = ptr; 217 int i; 218 219 spin_lock(&s_shared_lock); 220 for (i = 0; i < ARRAY_SIZE(s_shared); i++) { 221 if (s_shared[i].cnt && s_shared[i].ptr == ptr) { 222 if (--s_shared[i].cnt) 223 ret = NULL; 224 break; 225 } 226 } 227 spin_unlock(&s_shared_lock); 228 229 return ret; 230 } 231 232 static inline void put_mount_options(struct ntfs_mount_options *options) 233 { 234 kfree(options->nls_name); 235 unload_nls(options->nls); 236 kfree(options); 237 } 238 239 enum Opt { 240 Opt_uid, 241 Opt_gid, 242 Opt_umask, 243 Opt_dmask, 244 Opt_fmask, 245 Opt_immutable, 246 Opt_discard, 247 Opt_force, 248 Opt_sparse, 249 Opt_nohidden, 250 Opt_hide_dot_files, 251 Opt_windows_names, 252 Opt_showmeta, 253 Opt_acl, 254 Opt_iocharset, 255 Opt_prealloc, 256 Opt_nocase, 257 Opt_err, 258 }; 259 260 // clang-format off 261 static const struct fs_parameter_spec ntfs_fs_parameters[] = { 262 fsparam_u32("uid", Opt_uid), 263 fsparam_u32("gid", Opt_gid), 264 fsparam_u32oct("umask", Opt_umask), 265 fsparam_u32oct("dmask", Opt_dmask), 266 fsparam_u32oct("fmask", Opt_fmask), 267 fsparam_flag_no("sys_immutable", Opt_immutable), 268 fsparam_flag_no("discard", Opt_discard), 269 fsparam_flag_no("force", Opt_force), 270 fsparam_flag_no("sparse", Opt_sparse), 271 fsparam_flag_no("hidden", Opt_nohidden), 272 fsparam_flag_no("hide_dot_files", Opt_hide_dot_files), 273 fsparam_flag_no("windows_names", Opt_windows_names), 274 fsparam_flag_no("showmeta", Opt_showmeta), 275 fsparam_flag_no("acl", Opt_acl), 276 fsparam_string("iocharset", Opt_iocharset), 277 fsparam_flag_no("prealloc", Opt_prealloc), 278 fsparam_flag_no("nocase", Opt_nocase), 279 {} 280 }; 281 // clang-format on 282 283 /* 284 * Load nls table or if @nls is utf8 then return NULL. 285 * 286 * It is good idea to use here "const char *nls". 287 * But load_nls accepts "char*". 288 */ 289 static struct nls_table *ntfs_load_nls(char *nls) 290 { 291 struct nls_table *ret; 292 293 if (!nls) 294 nls = CONFIG_NLS_DEFAULT; 295 296 if (strcmp(nls, "utf8") == 0) 297 return NULL; 298 299 if (strcmp(nls, CONFIG_NLS_DEFAULT) == 0) 300 return load_nls_default(); 301 302 ret = load_nls(nls); 303 if (ret) 304 return ret; 305 306 return ERR_PTR(-EINVAL); 307 } 308 309 static int ntfs_fs_parse_param(struct fs_context *fc, 310 struct fs_parameter *param) 311 { 312 struct ntfs_mount_options *opts = fc->fs_private; 313 struct fs_parse_result result; 314 int opt; 315 316 opt = fs_parse(fc, ntfs_fs_parameters, param, &result); 317 if (opt < 0) 318 return opt; 319 320 switch (opt) { 321 case Opt_uid: 322 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); 323 if (!uid_valid(opts->fs_uid)) 324 return invalf(fc, "ntfs3: Invalid value for uid."); 325 break; 326 case Opt_gid: 327 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); 328 if (!gid_valid(opts->fs_gid)) 329 return invalf(fc, "ntfs3: Invalid value for gid."); 330 break; 331 case Opt_umask: 332 if (result.uint_32 & ~07777) 333 return invalf(fc, "ntfs3: Invalid value for umask."); 334 opts->fs_fmask_inv = ~result.uint_32; 335 opts->fs_dmask_inv = ~result.uint_32; 336 opts->fmask = 1; 337 opts->dmask = 1; 338 break; 339 case Opt_dmask: 340 if (result.uint_32 & ~07777) 341 return invalf(fc, "ntfs3: Invalid value for dmask."); 342 opts->fs_dmask_inv = ~result.uint_32; 343 opts->dmask = 1; 344 break; 345 case Opt_fmask: 346 if (result.uint_32 & ~07777) 347 return invalf(fc, "ntfs3: Invalid value for fmask."); 348 opts->fs_fmask_inv = ~result.uint_32; 349 opts->fmask = 1; 350 break; 351 case Opt_immutable: 352 opts->sys_immutable = result.negated ? 0 : 1; 353 break; 354 case Opt_discard: 355 opts->discard = result.negated ? 0 : 1; 356 break; 357 case Opt_force: 358 opts->force = result.negated ? 0 : 1; 359 break; 360 case Opt_sparse: 361 opts->sparse = result.negated ? 0 : 1; 362 break; 363 case Opt_nohidden: 364 opts->nohidden = result.negated ? 1 : 0; 365 break; 366 case Opt_hide_dot_files: 367 opts->hide_dot_files = result.negated ? 0 : 1; 368 break; 369 case Opt_windows_names: 370 opts->windows_names = result.negated ? 0 : 1; 371 break; 372 case Opt_showmeta: 373 opts->showmeta = result.negated ? 0 : 1; 374 break; 375 case Opt_acl: 376 if (!result.negated) 377 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 378 fc->sb_flags |= SB_POSIXACL; 379 #else 380 return invalf( 381 fc, "ntfs3: Support for ACL not compiled in!"); 382 #endif 383 else 384 fc->sb_flags &= ~SB_POSIXACL; 385 break; 386 case Opt_iocharset: 387 kfree(opts->nls_name); 388 opts->nls_name = param->string; 389 param->string = NULL; 390 break; 391 case Opt_prealloc: 392 opts->prealloc = result.negated ? 0 : 1; 393 break; 394 case Opt_nocase: 395 opts->nocase = result.negated ? 1 : 0; 396 break; 397 default: 398 /* Should not be here unless we forget add case. */ 399 return -EINVAL; 400 } 401 return 0; 402 } 403 404 static int ntfs_fs_reconfigure(struct fs_context *fc) 405 { 406 struct super_block *sb = fc->root->d_sb; 407 struct ntfs_sb_info *sbi = sb->s_fs_info; 408 struct ntfs_mount_options *new_opts = fc->fs_private; 409 int ro_rw; 410 411 /* If ntfs3 is used as legacy ntfs enforce read-only mode. */ 412 if (is_legacy_ntfs(sb)) { 413 fc->sb_flags |= SB_RDONLY; 414 goto out; 415 } 416 417 ro_rw = sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY); 418 if (ro_rw && (sbi->flags & NTFS_FLAGS_NEED_REPLAY)) { 419 errorf(fc, 420 "ntfs3: Couldn't remount rw because journal is not replayed. Please umount/remount instead\n"); 421 return -EINVAL; 422 } 423 424 new_opts->nls = ntfs_load_nls(new_opts->nls_name); 425 if (IS_ERR(new_opts->nls)) { 426 new_opts->nls = NULL; 427 errorf(fc, "ntfs3: Cannot load iocharset %s", 428 new_opts->nls_name); 429 return -EINVAL; 430 } 431 if (new_opts->nls != sbi->options->nls) 432 return invalf( 433 fc, 434 "ntfs3: Cannot use different iocharset when remounting!"); 435 436 if (ro_rw && (sbi->volume.flags & VOLUME_FLAG_DIRTY) && 437 !new_opts->force) { 438 errorf(fc, 439 "ntfs3: Volume is dirty and \"force\" flag is not set!"); 440 return -EINVAL; 441 } 442 443 out: 444 sync_filesystem(sb); 445 swap(sbi->options, fc->fs_private); 446 447 return 0; 448 } 449 450 #ifdef CONFIG_PROC_FS 451 static struct proc_dir_entry *proc_info_root; 452 453 /* 454 * ntfs3_volinfo: 455 * 456 * The content of /proc/fs/ntfs3/<dev>/volinfo 457 * 458 * ntfs3.1 459 * cluster size 460 * number of clusters 461 * total number of mft records 462 * number of used mft records ~= number of files + folders 463 * real state of ntfs "dirty"/"clean" 464 * current state of ntfs "dirty"/"clean" 465 */ 466 static int ntfs3_volinfo(struct seq_file *m, void *o) 467 { 468 struct super_block *sb = m->private; 469 struct ntfs_sb_info *sbi = sb->s_fs_info; 470 471 seq_printf(m, "ntfs%d.%d\n%u\n%zu\n\%zu\n%zu\n%s\n%s\n", 472 sbi->volume.major_ver, sbi->volume.minor_ver, 473 sbi->cluster_size, sbi->used.bitmap.nbits, 474 sbi->mft.bitmap.nbits, 475 sbi->mft.bitmap.nbits - wnd_zeroes(&sbi->mft.bitmap), 476 sbi->volume.real_dirty ? "dirty" : "clean", 477 (sbi->volume.flags & VOLUME_FLAG_DIRTY) ? "dirty" : "clean"); 478 479 return 0; 480 } 481 482 static int ntfs3_volinfo_open(struct inode *inode, struct file *file) 483 { 484 return single_open(file, ntfs3_volinfo, pde_data(inode)); 485 } 486 487 /* read /proc/fs/ntfs3/<dev>/label */ 488 static int ntfs3_label_show(struct seq_file *m, void *o) 489 { 490 struct super_block *sb = m->private; 491 struct ntfs_sb_info *sbi = sb->s_fs_info; 492 493 seq_printf(m, "%s\n", sbi->volume.label); 494 495 return 0; 496 } 497 498 /* write /proc/fs/ntfs3/<dev>/label */ 499 static ssize_t ntfs3_label_write(struct file *file, const char __user *buffer, 500 size_t count, loff_t *ppos) 501 { 502 int err; 503 struct super_block *sb = pde_data(file_inode(file)); 504 ssize_t ret = count; 505 u8 *label; 506 507 if (sb_rdonly(sb)) 508 return -EROFS; 509 510 label = kmalloc(count, GFP_NOFS); 511 512 if (!label) 513 return -ENOMEM; 514 515 if (copy_from_user(label, buffer, ret)) { 516 ret = -EFAULT; 517 goto out; 518 } 519 while (ret > 0 && label[ret - 1] == '\n') 520 ret -= 1; 521 522 err = ntfs_set_label(sb->s_fs_info, label, ret); 523 524 if (err < 0) { 525 ntfs_err(sb, "failed (%d) to write label", err); 526 ret = err; 527 goto out; 528 } 529 530 *ppos += count; 531 ret = count; 532 out: 533 kfree(label); 534 return ret; 535 } 536 537 static int ntfs3_label_open(struct inode *inode, struct file *file) 538 { 539 return single_open(file, ntfs3_label_show, pde_data(inode)); 540 } 541 542 static const struct proc_ops ntfs3_volinfo_fops = { 543 .proc_read = seq_read, 544 .proc_lseek = seq_lseek, 545 .proc_release = single_release, 546 .proc_open = ntfs3_volinfo_open, 547 }; 548 549 static const struct proc_ops ntfs3_label_fops = { 550 .proc_read = seq_read, 551 .proc_lseek = seq_lseek, 552 .proc_release = single_release, 553 .proc_open = ntfs3_label_open, 554 .proc_write = ntfs3_label_write, 555 }; 556 557 #endif 558 559 static struct kmem_cache *ntfs_inode_cachep; 560 561 static struct inode *ntfs_alloc_inode(struct super_block *sb) 562 { 563 struct ntfs_inode *ni = alloc_inode_sb(sb, ntfs_inode_cachep, GFP_NOFS); 564 565 if (!ni) 566 return NULL; 567 568 memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode)); 569 mutex_init(&ni->ni_lock); 570 return &ni->vfs_inode; 571 } 572 573 static void ntfs_free_inode(struct inode *inode) 574 { 575 struct ntfs_inode *ni = ntfs_i(inode); 576 577 mutex_destroy(&ni->ni_lock); 578 kmem_cache_free(ntfs_inode_cachep, ni); 579 } 580 581 static void init_once(void *foo) 582 { 583 struct ntfs_inode *ni = foo; 584 585 inode_init_once(&ni->vfs_inode); 586 } 587 588 /* 589 * Noinline to reduce binary size. 590 */ 591 static noinline void ntfs3_put_sbi(struct ntfs_sb_info *sbi) 592 { 593 wnd_close(&sbi->mft.bitmap); 594 wnd_close(&sbi->used.bitmap); 595 596 if (sbi->mft.ni) { 597 iput(&sbi->mft.ni->vfs_inode); 598 sbi->mft.ni = NULL; 599 } 600 601 if (sbi->security.ni) { 602 iput(&sbi->security.ni->vfs_inode); 603 sbi->security.ni = NULL; 604 } 605 606 if (sbi->reparse.ni) { 607 iput(&sbi->reparse.ni->vfs_inode); 608 sbi->reparse.ni = NULL; 609 } 610 611 if (sbi->objid.ni) { 612 iput(&sbi->objid.ni->vfs_inode); 613 sbi->objid.ni = NULL; 614 } 615 616 if (sbi->volume.ni) { 617 iput(&sbi->volume.ni->vfs_inode); 618 sbi->volume.ni = NULL; 619 } 620 621 ntfs_update_mftmirr(sbi, 0); 622 623 indx_clear(&sbi->security.index_sii); 624 indx_clear(&sbi->security.index_sdh); 625 indx_clear(&sbi->reparse.index_r); 626 indx_clear(&sbi->objid.index_o); 627 } 628 629 static void ntfs3_free_sbi(struct ntfs_sb_info *sbi) 630 { 631 kfree(sbi->new_rec); 632 kvfree(ntfs_put_shared(sbi->upcase)); 633 kvfree(sbi->def_table); 634 kfree(sbi->compress.lznt); 635 #ifdef CONFIG_NTFS3_LZX_XPRESS 636 xpress_free_decompressor(sbi->compress.xpress); 637 lzx_free_decompressor(sbi->compress.lzx); 638 #endif 639 kfree(sbi); 640 } 641 642 static void ntfs_put_super(struct super_block *sb) 643 { 644 struct ntfs_sb_info *sbi = sb->s_fs_info; 645 646 #ifdef CONFIG_PROC_FS 647 // Remove /proc/fs/ntfs3/.. 648 if (sbi->procdir) { 649 remove_proc_entry("label", sbi->procdir); 650 remove_proc_entry("volinfo", sbi->procdir); 651 remove_proc_entry(sb->s_id, proc_info_root); 652 sbi->procdir = NULL; 653 } 654 #endif 655 656 /* Mark rw ntfs as clear, if possible. */ 657 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 658 ntfs3_put_sbi(sbi); 659 } 660 661 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf) 662 { 663 struct super_block *sb = dentry->d_sb; 664 struct ntfs_sb_info *sbi = sb->s_fs_info; 665 struct wnd_bitmap *wnd = &sbi->used.bitmap; 666 667 buf->f_type = sb->s_magic; 668 buf->f_bsize = sbi->cluster_size; 669 buf->f_blocks = wnd->nbits; 670 671 buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd); 672 buf->f_fsid.val[0] = sbi->volume.ser_num; 673 buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32); 674 buf->f_namelen = NTFS_NAME_LEN; 675 676 return 0; 677 } 678 679 static int ntfs_show_options(struct seq_file *m, struct dentry *root) 680 { 681 struct super_block *sb = root->d_sb; 682 struct ntfs_sb_info *sbi = sb->s_fs_info; 683 struct ntfs_mount_options *opts = sbi->options; 684 struct user_namespace *user_ns = seq_user_ns(m); 685 686 seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid)); 687 seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid)); 688 if (opts->dmask) 689 seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff); 690 if (opts->fmask) 691 seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff); 692 if (opts->sys_immutable) 693 seq_puts(m, ",sys_immutable"); 694 if (opts->discard) 695 seq_puts(m, ",discard"); 696 if (opts->force) 697 seq_puts(m, ",force"); 698 if (opts->sparse) 699 seq_puts(m, ",sparse"); 700 if (opts->nohidden) 701 seq_puts(m, ",nohidden"); 702 if (opts->hide_dot_files) 703 seq_puts(m, ",hide_dot_files"); 704 if (opts->windows_names) 705 seq_puts(m, ",windows_names"); 706 if (opts->showmeta) 707 seq_puts(m, ",showmeta"); 708 if (sb->s_flags & SB_POSIXACL) 709 seq_puts(m, ",acl"); 710 if (opts->nls) 711 seq_printf(m, ",iocharset=%s", opts->nls->charset); 712 else 713 seq_puts(m, ",iocharset=utf8"); 714 if (opts->prealloc) 715 seq_puts(m, ",prealloc"); 716 if (opts->nocase) 717 seq_puts(m, ",nocase"); 718 719 return 0; 720 } 721 722 /* 723 * ntfs_shutdown - super_operations::shutdown 724 */ 725 static void ntfs_shutdown(struct super_block *sb) 726 { 727 set_bit(NTFS_FLAGS_SHUTDOWN_BIT, &ntfs_sb(sb)->flags); 728 } 729 730 /* 731 * ntfs_sync_fs - super_operations::sync_fs 732 */ 733 static int ntfs_sync_fs(struct super_block *sb, int wait) 734 { 735 int err = 0, err2; 736 struct ntfs_sb_info *sbi = sb->s_fs_info; 737 struct ntfs_inode *ni; 738 struct inode *inode; 739 740 if (unlikely(ntfs3_forced_shutdown(sb))) 741 return -EIO; 742 743 ni = sbi->security.ni; 744 if (ni) { 745 inode = &ni->vfs_inode; 746 err2 = _ni_write_inode(inode, wait); 747 if (err2 && !err) 748 err = err2; 749 } 750 751 ni = sbi->objid.ni; 752 if (ni) { 753 inode = &ni->vfs_inode; 754 err2 = _ni_write_inode(inode, wait); 755 if (err2 && !err) 756 err = err2; 757 } 758 759 ni = sbi->reparse.ni; 760 if (ni) { 761 inode = &ni->vfs_inode; 762 err2 = _ni_write_inode(inode, wait); 763 if (err2 && !err) 764 err = err2; 765 } 766 767 if (!err) 768 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 769 770 ntfs_update_mftmirr(sbi, wait); 771 772 return err; 773 } 774 775 static const struct super_operations ntfs_sops = { 776 .alloc_inode = ntfs_alloc_inode, 777 .free_inode = ntfs_free_inode, 778 .evict_inode = ntfs_evict_inode, 779 .put_super = ntfs_put_super, 780 .statfs = ntfs_statfs, 781 .show_options = ntfs_show_options, 782 .shutdown = ntfs_shutdown, 783 .sync_fs = ntfs_sync_fs, 784 .write_inode = ntfs3_write_inode, 785 }; 786 787 static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino, 788 u32 generation) 789 { 790 struct MFT_REF ref; 791 struct inode *inode; 792 793 ref.low = cpu_to_le32(ino); 794 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 795 ref.high = cpu_to_le16(ino >> 32); 796 #else 797 ref.high = 0; 798 #endif 799 ref.seq = cpu_to_le16(generation); 800 801 inode = ntfs_iget5(sb, &ref, NULL); 802 if (!IS_ERR(inode) && is_bad_inode(inode)) { 803 iput(inode); 804 inode = ERR_PTR(-ESTALE); 805 } 806 807 return inode; 808 } 809 810 static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid, 811 int fh_len, int fh_type) 812 { 813 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 814 ntfs_export_get_inode); 815 } 816 817 static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid, 818 int fh_len, int fh_type) 819 { 820 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 821 ntfs_export_get_inode); 822 } 823 824 /* TODO: == ntfs_sync_inode */ 825 static int ntfs_nfs_commit_metadata(struct inode *inode) 826 { 827 return _ni_write_inode(inode, 1); 828 } 829 830 static const struct export_operations ntfs_export_ops = { 831 .encode_fh = generic_encode_ino32_fh, 832 .fh_to_dentry = ntfs_fh_to_dentry, 833 .fh_to_parent = ntfs_fh_to_parent, 834 .get_parent = ntfs3_get_parent, 835 .commit_metadata = ntfs_nfs_commit_metadata, 836 }; 837 838 /* 839 * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb". 840 */ 841 static u32 format_size_gb(const u64 bytes, u32 *mb) 842 { 843 /* Do simple right 30 bit shift of 64 bit value. */ 844 u64 kbytes = bytes >> 10; 845 u32 kbytes32 = kbytes; 846 847 *mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20; 848 if (*mb >= 100) 849 *mb = 99; 850 851 return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12); 852 } 853 854 static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot) 855 { 856 if (boot->sectors_per_clusters <= 0x80) 857 return boot->sectors_per_clusters; 858 if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */ 859 return 1U << (-(s8)boot->sectors_per_clusters); 860 return -EINVAL; 861 } 862 863 /* 864 * ntfs_init_from_boot - Init internal info from on-disk boot sector. 865 * 866 * NTFS mount begins from boot - special formatted 512 bytes. 867 * There are two boots: the first and the last 512 bytes of volume. 868 * The content of boot is not changed during ntfs life. 869 * 870 * NOTE: ntfs.sys checks only first (primary) boot. 871 * chkdsk checks both boots. 872 */ 873 static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, 874 u64 dev_size, struct NTFS_BOOT **boot2) 875 { 876 struct ntfs_sb_info *sbi = sb->s_fs_info; 877 int err; 878 u32 mb, gb, boot_sector_size, sct_per_clst, record_size; 879 u64 sectors, clusters, mlcn, mlcn2, dev_size0; 880 struct NTFS_BOOT *boot; 881 struct buffer_head *bh; 882 struct MFT_REC *rec; 883 u16 fn, ao; 884 u8 cluster_bits; 885 u32 boot_off = 0; 886 sector_t boot_block = 0; 887 const char *hint = "Primary boot"; 888 889 /* Save original dev_size. Used with alternative boot. */ 890 dev_size0 = dev_size; 891 892 sbi->volume.blocks = dev_size >> PAGE_SHIFT; 893 894 read_boot: 895 bh = ntfs_bread(sb, boot_block); 896 if (!bh) 897 return boot_block ? -EINVAL : -EIO; 898 899 err = -EINVAL; 900 901 /* Corrupted image; do not read OOB */ 902 if (bh->b_size - sizeof(*boot) < boot_off) 903 goto out; 904 905 boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off); 906 907 if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) { 908 ntfs_err(sb, "%s signature is not NTFS.", hint); 909 goto out; 910 } 911 912 /* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/ 913 /*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1]) 914 * goto out; 915 */ 916 917 boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) | 918 boot->bytes_per_sector[0]; 919 if (boot_sector_size < SECTOR_SIZE || 920 !is_power_of_2(boot_sector_size)) { 921 ntfs_err(sb, "%s: invalid bytes per sector %u.", hint, 922 boot_sector_size); 923 goto out; 924 } 925 926 /* cluster size: 512, 1K, 2K, 4K, ... 2M */ 927 sct_per_clst = true_sectors_per_clst(boot); 928 if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) { 929 ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint, 930 sct_per_clst); 931 goto out; 932 } 933 934 sbi->cluster_size = boot_sector_size * sct_per_clst; 935 sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size); 936 sbi->cluster_mask = sbi->cluster_size - 1; 937 sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask; 938 939 mlcn = le64_to_cpu(boot->mft_clst); 940 mlcn2 = le64_to_cpu(boot->mft2_clst); 941 sectors = le64_to_cpu(boot->sectors_per_volume); 942 943 if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) { 944 ntfs_err( 945 sb, 946 "%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.", 947 hint, mlcn, mlcn2, sectors); 948 goto out; 949 } 950 951 if (boot->record_size >= 0) { 952 record_size = (u32)boot->record_size << cluster_bits; 953 } else if (-boot->record_size <= MAXIMUM_SHIFT_BYTES_PER_MFT) { 954 record_size = 1u << (-boot->record_size); 955 } else { 956 ntfs_err(sb, "%s: invalid record size %d.", hint, 957 boot->record_size); 958 goto out; 959 } 960 961 sbi->record_size = record_size; 962 sbi->record_bits = blksize_bits(record_size); 963 sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes 964 965 /* Check MFT record size. */ 966 if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) { 967 ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint, 968 record_size, boot->record_size); 969 goto out; 970 } 971 972 if (record_size > MAXIMUM_BYTES_PER_MFT) { 973 ntfs_err(sb, "Unsupported bytes per MFT record %u.", 974 record_size); 975 goto out; 976 } 977 978 if (boot->index_size >= 0) { 979 sbi->index_size = (u32)boot->index_size << cluster_bits; 980 } else if (-boot->index_size <= MAXIMUM_SHIFT_BYTES_PER_INDEX) { 981 sbi->index_size = 1u << (-boot->index_size); 982 } else { 983 ntfs_err(sb, "%s: invalid index size %d.", hint, 984 boot->index_size); 985 goto out; 986 } 987 988 /* Check index record size. */ 989 if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) { 990 ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint, 991 sbi->index_size, boot->index_size); 992 goto out; 993 } 994 995 if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) { 996 ntfs_err(sb, "%s: unsupported bytes per index %u.", hint, 997 sbi->index_size); 998 goto out; 999 } 1000 1001 sbi->volume.size = sectors * boot_sector_size; 1002 1003 gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb); 1004 1005 /* 1006 * - Volume formatted and mounted with the same sector size. 1007 * - Volume formatted 4K and mounted as 512. 1008 * - Volume formatted 512 and mounted as 4K. 1009 */ 1010 if (boot_sector_size != sector_size) { 1011 ntfs_warn( 1012 sb, 1013 "Different NTFS sector size (%u) and media sector size (%u).", 1014 boot_sector_size, sector_size); 1015 dev_size += sector_size - 1; 1016 } 1017 1018 sbi->mft.lbo = mlcn << cluster_bits; 1019 sbi->mft.lbo2 = mlcn2 << cluster_bits; 1020 1021 /* Compare boot's cluster and sector. */ 1022 if (sbi->cluster_size < boot_sector_size) { 1023 ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint, 1024 sbi->cluster_size); 1025 goto out; 1026 } 1027 1028 /* Compare boot's cluster and media sector. */ 1029 if (sbi->cluster_size < sector_size) { 1030 /* No way to use ntfs_get_block in this case. */ 1031 ntfs_err( 1032 sb, 1033 "Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).", 1034 sbi->cluster_size, sector_size); 1035 goto out; 1036 } 1037 1038 sbi->max_bytes_per_attr = 1039 record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) - 1040 ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) - 1041 ALIGN(sizeof(enum ATTR_TYPE), 8); 1042 1043 sbi->volume.ser_num = le64_to_cpu(boot->serial_num); 1044 1045 /* Warning if RAW volume. */ 1046 if (dev_size < sbi->volume.size + boot_sector_size) { 1047 u32 mb0, gb0; 1048 1049 gb0 = format_size_gb(dev_size, &mb0); 1050 ntfs_warn( 1051 sb, 1052 "RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.", 1053 gb, mb, gb0, mb0); 1054 sb->s_flags |= SB_RDONLY; 1055 } 1056 1057 clusters = sbi->volume.size >> cluster_bits; 1058 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1059 /* 32 bits per cluster. */ 1060 if (clusters >> 32) { 1061 ntfs_notice( 1062 sb, 1063 "NTFS %u.%02u Gb is too big to use 32 bits per cluster.", 1064 gb, mb); 1065 goto out; 1066 } 1067 #elif BITS_PER_LONG < 64 1068 #error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS" 1069 #endif 1070 1071 sbi->used.bitmap.nbits = clusters; 1072 1073 rec = kzalloc(record_size, GFP_NOFS); 1074 if (!rec) { 1075 err = -ENOMEM; 1076 goto out; 1077 } 1078 1079 sbi->new_rec = rec; 1080 rec->rhdr.sign = NTFS_FILE_SIGNATURE; 1081 rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET); 1082 fn = (sbi->record_size >> SECTOR_SHIFT) + 1; 1083 rec->rhdr.fix_num = cpu_to_le16(fn); 1084 ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8); 1085 rec->attr_off = cpu_to_le16(ao); 1086 rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8)); 1087 rec->total = cpu_to_le32(sbi->record_size); 1088 ((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END; 1089 1090 sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE)); 1091 1092 sbi->block_mask = sb->s_blocksize - 1; 1093 sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits; 1094 sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits; 1095 1096 /* Maximum size for normal files. */ 1097 sbi->maxbytes = (clusters << cluster_bits) - 1; 1098 1099 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1100 if (clusters >= (1ull << (64 - cluster_bits))) 1101 sbi->maxbytes = -1; 1102 sbi->maxbytes_sparse = -1; 1103 sb->s_maxbytes = MAX_LFS_FILESIZE; 1104 #else 1105 /* Maximum size for sparse file. */ 1106 sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1; 1107 sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits; 1108 #endif 1109 1110 /* 1111 * Compute the MFT zone at two steps. 1112 * It would be nice if we are able to allocate 1/8 of 1113 * total clusters for MFT but not more then 512 MB. 1114 */ 1115 sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3); 1116 1117 err = 0; 1118 1119 if (bh->b_blocknr && !sb_rdonly(sb)) { 1120 /* 1121 * Alternative boot is ok but primary is not ok. 1122 * Do not update primary boot here 'cause it may be faked boot. 1123 * Let ntfs to be mounted and update boot later. 1124 */ 1125 *boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN); 1126 } 1127 1128 out: 1129 brelse(bh); 1130 1131 if (err == -EINVAL && !boot_block && dev_size0 > PAGE_SHIFT) { 1132 u32 block_size = min_t(u32, sector_size, PAGE_SIZE); 1133 u64 lbo = dev_size0 - sizeof(*boot); 1134 1135 boot_block = lbo >> blksize_bits(block_size); 1136 boot_off = lbo & (block_size - 1); 1137 if (boot_block && block_size >= boot_off + sizeof(*boot)) { 1138 /* 1139 * Try alternative boot (last sector) 1140 */ 1141 sb_set_blocksize(sb, block_size); 1142 hint = "Alternative boot"; 1143 dev_size = dev_size0; /* restore original size. */ 1144 goto read_boot; 1145 } 1146 } 1147 1148 return err; 1149 } 1150 1151 /* 1152 * ntfs_fill_super - Try to mount. 1153 */ 1154 static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc) 1155 { 1156 int err; 1157 struct ntfs_sb_info *sbi = sb->s_fs_info; 1158 struct block_device *bdev = sb->s_bdev; 1159 struct ntfs_mount_options *options; 1160 struct inode *inode; 1161 struct ntfs_inode *ni; 1162 size_t i, tt, bad_len, bad_frags; 1163 CLST vcn, lcn, len; 1164 struct ATTRIB *attr; 1165 const struct VOLUME_INFO *info; 1166 u32 idx, done, bytes; 1167 struct ATTR_DEF_ENTRY *t; 1168 u16 *shared; 1169 struct MFT_REF ref; 1170 bool ro = sb_rdonly(sb); 1171 struct NTFS_BOOT *boot2 = NULL; 1172 1173 ref.high = 0; 1174 1175 sbi->sb = sb; 1176 sbi->options = options = fc->fs_private; 1177 fc->fs_private = NULL; 1178 sb->s_flags |= SB_NODIRATIME; 1179 sb->s_magic = 0x7366746e; // "ntfs" 1180 sb->s_op = &ntfs_sops; 1181 sb->s_export_op = &ntfs_export_ops; 1182 sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec 1183 sb->s_xattr = ntfs_xattr_handlers; 1184 sb->s_d_op = options->nocase ? &ntfs_dentry_ops : NULL; 1185 1186 options->nls = ntfs_load_nls(options->nls_name); 1187 if (IS_ERR(options->nls)) { 1188 options->nls = NULL; 1189 errorf(fc, "Cannot load nls %s", options->nls_name); 1190 err = -EINVAL; 1191 goto out; 1192 } 1193 1194 if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) { 1195 sbi->discard_granularity = bdev_discard_granularity(bdev); 1196 sbi->discard_granularity_mask_inv = 1197 ~(u64)(sbi->discard_granularity - 1); 1198 } 1199 1200 /* Parse boot. */ 1201 err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev), 1202 bdev_nr_bytes(bdev), &boot2); 1203 if (err) 1204 goto out; 1205 1206 /* 1207 * Load $Volume. This should be done before $LogFile 1208 * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'. 1209 */ 1210 ref.low = cpu_to_le32(MFT_REC_VOL); 1211 ref.seq = cpu_to_le16(MFT_REC_VOL); 1212 inode = ntfs_iget5(sb, &ref, &NAME_VOLUME); 1213 if (IS_ERR(inode)) { 1214 err = PTR_ERR(inode); 1215 ntfs_err(sb, "Failed to load $Volume (%d).", err); 1216 goto out; 1217 } 1218 1219 ni = ntfs_i(inode); 1220 1221 /* Load and save label (not necessary). */ 1222 attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL); 1223 1224 if (!attr) { 1225 /* It is ok if no ATTR_LABEL */ 1226 } else if (!attr->non_res && !is_attr_ext(attr)) { 1227 /* $AttrDef allows labels to be up to 128 symbols. */ 1228 err = utf16s_to_utf8s(resident_data(attr), 1229 le32_to_cpu(attr->res.data_size) >> 1, 1230 UTF16_LITTLE_ENDIAN, sbi->volume.label, 1231 sizeof(sbi->volume.label)); 1232 if (err < 0) 1233 sbi->volume.label[0] = 0; 1234 } else { 1235 /* Should we break mounting here? */ 1236 //err = -EINVAL; 1237 //goto put_inode_out; 1238 } 1239 1240 attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL); 1241 if (!attr || is_attr_ext(attr) || 1242 !(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) { 1243 ntfs_err(sb, "$Volume is corrupted."); 1244 err = -EINVAL; 1245 goto put_inode_out; 1246 } 1247 1248 sbi->volume.major_ver = info->major_ver; 1249 sbi->volume.minor_ver = info->minor_ver; 1250 sbi->volume.flags = info->flags; 1251 sbi->volume.ni = ni; 1252 if (info->flags & VOLUME_FLAG_DIRTY) { 1253 sbi->volume.real_dirty = true; 1254 ntfs_info(sb, "It is recommened to use chkdsk."); 1255 } 1256 1257 /* Load $MFTMirr to estimate recs_mirr. */ 1258 ref.low = cpu_to_le32(MFT_REC_MIRR); 1259 ref.seq = cpu_to_le16(MFT_REC_MIRR); 1260 inode = ntfs_iget5(sb, &ref, &NAME_MIRROR); 1261 if (IS_ERR(inode)) { 1262 err = PTR_ERR(inode); 1263 ntfs_err(sb, "Failed to load $MFTMirr (%d).", err); 1264 goto out; 1265 } 1266 1267 sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >> 1268 sbi->record_bits; 1269 1270 iput(inode); 1271 1272 /* Load LogFile to replay. */ 1273 ref.low = cpu_to_le32(MFT_REC_LOG); 1274 ref.seq = cpu_to_le16(MFT_REC_LOG); 1275 inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE); 1276 if (IS_ERR(inode)) { 1277 err = PTR_ERR(inode); 1278 ntfs_err(sb, "Failed to load \x24LogFile (%d).", err); 1279 goto out; 1280 } 1281 1282 ni = ntfs_i(inode); 1283 1284 err = ntfs_loadlog_and_replay(ni, sbi); 1285 if (err) 1286 goto put_inode_out; 1287 1288 iput(inode); 1289 1290 if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) { 1291 ntfs_warn(sb, "failed to replay log file. Can't mount rw!"); 1292 err = -EINVAL; 1293 goto out; 1294 } 1295 1296 if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) { 1297 ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!"); 1298 err = -EINVAL; 1299 goto out; 1300 } 1301 1302 /* Load $MFT. */ 1303 ref.low = cpu_to_le32(MFT_REC_MFT); 1304 ref.seq = cpu_to_le16(1); 1305 1306 inode = ntfs_iget5(sb, &ref, &NAME_MFT); 1307 if (IS_ERR(inode)) { 1308 err = PTR_ERR(inode); 1309 ntfs_err(sb, "Failed to load $MFT (%d).", err); 1310 goto out; 1311 } 1312 1313 ni = ntfs_i(inode); 1314 1315 sbi->mft.used = ni->i_valid >> sbi->record_bits; 1316 tt = inode->i_size >> sbi->record_bits; 1317 sbi->mft.next_free = MFT_REC_USER; 1318 1319 err = wnd_init(&sbi->mft.bitmap, sb, tt); 1320 if (err) 1321 goto put_inode_out; 1322 1323 err = ni_load_all_mi(ni); 1324 if (err) { 1325 ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err); 1326 goto put_inode_out; 1327 } 1328 1329 sbi->mft.ni = ni; 1330 1331 /* Load $Bitmap. */ 1332 ref.low = cpu_to_le32(MFT_REC_BITMAP); 1333 ref.seq = cpu_to_le16(MFT_REC_BITMAP); 1334 inode = ntfs_iget5(sb, &ref, &NAME_BITMAP); 1335 if (IS_ERR(inode)) { 1336 err = PTR_ERR(inode); 1337 ntfs_err(sb, "Failed to load $Bitmap (%d).", err); 1338 goto out; 1339 } 1340 1341 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1342 if (inode->i_size >> 32) { 1343 err = -EINVAL; 1344 goto put_inode_out; 1345 } 1346 #endif 1347 1348 /* Check bitmap boundary. */ 1349 tt = sbi->used.bitmap.nbits; 1350 if (inode->i_size < ntfs3_bitmap_size(tt)) { 1351 ntfs_err(sb, "$Bitmap is corrupted."); 1352 err = -EINVAL; 1353 goto put_inode_out; 1354 } 1355 1356 err = wnd_init(&sbi->used.bitmap, sb, tt); 1357 if (err) { 1358 ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err); 1359 goto put_inode_out; 1360 } 1361 1362 iput(inode); 1363 1364 /* Compute the MFT zone. */ 1365 err = ntfs_refresh_zone(sbi); 1366 if (err) { 1367 ntfs_err(sb, "Failed to initialize MFT zone (%d).", err); 1368 goto out; 1369 } 1370 1371 /* Load $BadClus. */ 1372 ref.low = cpu_to_le32(MFT_REC_BADCLUST); 1373 ref.seq = cpu_to_le16(MFT_REC_BADCLUST); 1374 inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS); 1375 if (IS_ERR(inode)) { 1376 err = PTR_ERR(inode); 1377 ntfs_err(sb, "Failed to load $BadClus (%d).", err); 1378 goto out; 1379 } 1380 1381 ni = ntfs_i(inode); 1382 bad_len = bad_frags = 0; 1383 for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) { 1384 if (lcn == SPARSE_LCN) 1385 continue; 1386 1387 bad_len += len; 1388 bad_frags += 1; 1389 if (ro) 1390 continue; 1391 1392 if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) { 1393 /* Bad blocks marked as free in bitmap. */ 1394 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 1395 } 1396 } 1397 if (bad_len) { 1398 /* 1399 * Notice about bad blocks. 1400 * In normal cases these blocks are marked as used in bitmap. 1401 * And we never allocate space in it. 1402 */ 1403 ntfs_notice(sb, 1404 "Volume contains %zu bad blocks in %zu fragments.", 1405 bad_len, bad_frags); 1406 } 1407 iput(inode); 1408 1409 /* Load $AttrDef. */ 1410 ref.low = cpu_to_le32(MFT_REC_ATTR); 1411 ref.seq = cpu_to_le16(MFT_REC_ATTR); 1412 inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF); 1413 if (IS_ERR(inode)) { 1414 err = PTR_ERR(inode); 1415 ntfs_err(sb, "Failed to load $AttrDef (%d)", err); 1416 goto out; 1417 } 1418 1419 /* 1420 * Typical $AttrDef contains up to 20 entries. 1421 * Check for extremely large/small size. 1422 */ 1423 if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) || 1424 inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) { 1425 ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).", 1426 inode->i_size); 1427 err = -EINVAL; 1428 goto put_inode_out; 1429 } 1430 1431 bytes = inode->i_size; 1432 sbi->def_table = t = kvmalloc(bytes, GFP_KERNEL); 1433 if (!t) { 1434 err = -ENOMEM; 1435 goto put_inode_out; 1436 } 1437 1438 for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) { 1439 unsigned long tail = bytes - done; 1440 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1441 1442 if (IS_ERR(page)) { 1443 err = PTR_ERR(page); 1444 ntfs_err(sb, "Failed to read $AttrDef (%d).", err); 1445 goto put_inode_out; 1446 } 1447 memcpy(Add2Ptr(t, done), page_address(page), 1448 min(PAGE_SIZE, tail)); 1449 ntfs_unmap_page(page); 1450 1451 if (!idx && ATTR_STD != t->type) { 1452 ntfs_err(sb, "$AttrDef is corrupted."); 1453 err = -EINVAL; 1454 goto put_inode_out; 1455 } 1456 } 1457 1458 t += 1; 1459 sbi->def_entries = 1; 1460 done = sizeof(struct ATTR_DEF_ENTRY); 1461 sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE; 1462 sbi->ea_max_size = 0x10000; /* default formatter value */ 1463 1464 while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) { 1465 u32 t32 = le32_to_cpu(t->type); 1466 u64 sz = le64_to_cpu(t->max_sz); 1467 1468 if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32) 1469 break; 1470 1471 if (t->type == ATTR_REPARSE) 1472 sbi->reparse.max_size = sz; 1473 else if (t->type == ATTR_EA) 1474 sbi->ea_max_size = sz; 1475 1476 done += sizeof(struct ATTR_DEF_ENTRY); 1477 t += 1; 1478 sbi->def_entries += 1; 1479 } 1480 iput(inode); 1481 1482 /* Load $UpCase. */ 1483 ref.low = cpu_to_le32(MFT_REC_UPCASE); 1484 ref.seq = cpu_to_le16(MFT_REC_UPCASE); 1485 inode = ntfs_iget5(sb, &ref, &NAME_UPCASE); 1486 if (IS_ERR(inode)) { 1487 err = PTR_ERR(inode); 1488 ntfs_err(sb, "Failed to load $UpCase (%d).", err); 1489 goto out; 1490 } 1491 1492 if (inode->i_size != 0x10000 * sizeof(short)) { 1493 err = -EINVAL; 1494 ntfs_err(sb, "$UpCase is corrupted."); 1495 goto put_inode_out; 1496 } 1497 1498 for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) { 1499 const __le16 *src; 1500 u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT); 1501 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1502 1503 if (IS_ERR(page)) { 1504 err = PTR_ERR(page); 1505 ntfs_err(sb, "Failed to read $UpCase (%d).", err); 1506 goto put_inode_out; 1507 } 1508 1509 src = page_address(page); 1510 1511 #ifdef __BIG_ENDIAN 1512 for (i = 0; i < PAGE_SIZE / sizeof(u16); i++) 1513 *dst++ = le16_to_cpu(*src++); 1514 #else 1515 memcpy(dst, src, PAGE_SIZE); 1516 #endif 1517 ntfs_unmap_page(page); 1518 } 1519 1520 shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short)); 1521 if (shared && sbi->upcase != shared) { 1522 kvfree(sbi->upcase); 1523 sbi->upcase = shared; 1524 } 1525 1526 iput(inode); 1527 1528 if (is_ntfs3(sbi)) { 1529 /* Load $Secure. */ 1530 err = ntfs_security_init(sbi); 1531 if (err) { 1532 ntfs_err(sb, "Failed to initialize $Secure (%d).", err); 1533 goto out; 1534 } 1535 1536 /* Load $Extend. */ 1537 err = ntfs_extend_init(sbi); 1538 if (err) { 1539 ntfs_warn(sb, "Failed to initialize $Extend."); 1540 goto load_root; 1541 } 1542 1543 /* Load $Extend/$Reparse. */ 1544 err = ntfs_reparse_init(sbi); 1545 if (err) { 1546 ntfs_warn(sb, "Failed to initialize $Extend/$Reparse."); 1547 goto load_root; 1548 } 1549 1550 /* Load $Extend/$ObjId. */ 1551 err = ntfs_objid_init(sbi); 1552 if (err) { 1553 ntfs_warn(sb, "Failed to initialize $Extend/$ObjId."); 1554 goto load_root; 1555 } 1556 } 1557 1558 load_root: 1559 /* Load root. */ 1560 ref.low = cpu_to_le32(MFT_REC_ROOT); 1561 ref.seq = cpu_to_le16(MFT_REC_ROOT); 1562 inode = ntfs_iget5(sb, &ref, &NAME_ROOT); 1563 if (IS_ERR(inode)) { 1564 err = PTR_ERR(inode); 1565 ntfs_err(sb, "Failed to load root (%d).", err); 1566 goto out; 1567 } 1568 1569 /* 1570 * Final check. Looks like this case should never occurs. 1571 */ 1572 if (!inode->i_op) { 1573 err = -EINVAL; 1574 ntfs_err(sb, "Failed to load root (%d).", err); 1575 goto put_inode_out; 1576 } 1577 1578 sb->s_root = d_make_root(inode); 1579 if (!sb->s_root) { 1580 err = -ENOMEM; 1581 goto put_inode_out; 1582 } 1583 1584 if (boot2) { 1585 /* 1586 * Alternative boot is ok but primary is not ok. 1587 * Volume is recognized as NTFS. Update primary boot. 1588 */ 1589 struct buffer_head *bh0 = sb_getblk(sb, 0); 1590 if (bh0) { 1591 if (buffer_locked(bh0)) 1592 __wait_on_buffer(bh0); 1593 1594 lock_buffer(bh0); 1595 memcpy(bh0->b_data, boot2, sizeof(*boot2)); 1596 set_buffer_uptodate(bh0); 1597 mark_buffer_dirty(bh0); 1598 unlock_buffer(bh0); 1599 if (!sync_dirty_buffer(bh0)) 1600 ntfs_warn(sb, "primary boot is updated"); 1601 put_bh(bh0); 1602 } 1603 1604 kfree(boot2); 1605 } 1606 1607 #ifdef CONFIG_PROC_FS 1608 /* Create /proc/fs/ntfs3/.. */ 1609 if (proc_info_root) { 1610 struct proc_dir_entry *e = proc_mkdir(sb->s_id, proc_info_root); 1611 static_assert((S_IRUGO | S_IWUSR) == 0644); 1612 if (e) { 1613 proc_create_data("volinfo", S_IRUGO, e, 1614 &ntfs3_volinfo_fops, sb); 1615 proc_create_data("label", S_IRUGO | S_IWUSR, e, 1616 &ntfs3_label_fops, sb); 1617 sbi->procdir = e; 1618 } 1619 } 1620 #endif 1621 1622 if (is_legacy_ntfs(sb)) 1623 sb->s_flags |= SB_RDONLY; 1624 return 0; 1625 1626 put_inode_out: 1627 iput(inode); 1628 out: 1629 ntfs3_put_sbi(sbi); 1630 kfree(boot2); 1631 ntfs3_put_sbi(sbi); 1632 return err; 1633 } 1634 1635 void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len) 1636 { 1637 struct ntfs_sb_info *sbi = sb->s_fs_info; 1638 struct block_device *bdev = sb->s_bdev; 1639 sector_t devblock = (u64)lcn * sbi->blocks_per_cluster; 1640 unsigned long blocks = (u64)len * sbi->blocks_per_cluster; 1641 unsigned long cnt = 0; 1642 unsigned long limit = global_zone_page_state(NR_FREE_PAGES) 1643 << (PAGE_SHIFT - sb->s_blocksize_bits); 1644 1645 if (limit >= 0x2000) 1646 limit -= 0x1000; 1647 else if (limit < 32) 1648 limit = 32; 1649 else 1650 limit >>= 1; 1651 1652 while (blocks--) { 1653 clean_bdev_aliases(bdev, devblock++, 1); 1654 if (cnt++ >= limit) { 1655 sync_blockdev(bdev); 1656 cnt = 0; 1657 } 1658 } 1659 } 1660 1661 /* 1662 * ntfs_discard - Issue a discard request (trim for SSD). 1663 */ 1664 int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len) 1665 { 1666 int err; 1667 u64 lbo, bytes, start, end; 1668 struct super_block *sb; 1669 1670 if (sbi->used.next_free_lcn == lcn + len) 1671 sbi->used.next_free_lcn = lcn; 1672 1673 if (sbi->flags & NTFS_FLAGS_NODISCARD) 1674 return -EOPNOTSUPP; 1675 1676 if (!sbi->options->discard) 1677 return -EOPNOTSUPP; 1678 1679 lbo = (u64)lcn << sbi->cluster_bits; 1680 bytes = (u64)len << sbi->cluster_bits; 1681 1682 /* Align up 'start' on discard_granularity. */ 1683 start = (lbo + sbi->discard_granularity - 1) & 1684 sbi->discard_granularity_mask_inv; 1685 /* Align down 'end' on discard_granularity. */ 1686 end = (lbo + bytes) & sbi->discard_granularity_mask_inv; 1687 1688 sb = sbi->sb; 1689 if (start >= end) 1690 return 0; 1691 1692 err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9, 1693 GFP_NOFS); 1694 1695 if (err == -EOPNOTSUPP) 1696 sbi->flags |= NTFS_FLAGS_NODISCARD; 1697 1698 return err; 1699 } 1700 1701 static int ntfs_fs_get_tree(struct fs_context *fc) 1702 { 1703 return get_tree_bdev(fc, ntfs_fill_super); 1704 } 1705 1706 /* 1707 * ntfs_fs_free - Free fs_context. 1708 * 1709 * Note that this will be called after fill_super and reconfigure 1710 * even when they pass. So they have to take pointers if they pass. 1711 */ 1712 static void ntfs_fs_free(struct fs_context *fc) 1713 { 1714 struct ntfs_mount_options *opts = fc->fs_private; 1715 struct ntfs_sb_info *sbi = fc->s_fs_info; 1716 1717 if (sbi) { 1718 ntfs3_put_sbi(sbi); 1719 ntfs3_free_sbi(sbi); 1720 } 1721 1722 if (opts) 1723 put_mount_options(opts); 1724 } 1725 1726 // clang-format off 1727 static const struct fs_context_operations ntfs_context_ops = { 1728 .parse_param = ntfs_fs_parse_param, 1729 .get_tree = ntfs_fs_get_tree, 1730 .reconfigure = ntfs_fs_reconfigure, 1731 .free = ntfs_fs_free, 1732 }; 1733 // clang-format on 1734 1735 /* 1736 * ntfs_init_fs_context - Initialize sbi and opts 1737 * 1738 * This will called when mount/remount. We will first initialize 1739 * options so that if remount we can use just that. 1740 */ 1741 static int __ntfs_init_fs_context(struct fs_context *fc) 1742 { 1743 struct ntfs_mount_options *opts; 1744 struct ntfs_sb_info *sbi; 1745 1746 opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS); 1747 if (!opts) 1748 return -ENOMEM; 1749 1750 /* Default options. */ 1751 opts->fs_uid = current_uid(); 1752 opts->fs_gid = current_gid(); 1753 opts->fs_fmask_inv = ~current_umask(); 1754 opts->fs_dmask_inv = ~current_umask(); 1755 1756 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) 1757 goto ok; 1758 1759 sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS); 1760 if (!sbi) 1761 goto free_opts; 1762 1763 sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL); 1764 if (!sbi->upcase) 1765 goto free_sbi; 1766 1767 ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL, 1768 DEFAULT_RATELIMIT_BURST); 1769 1770 mutex_init(&sbi->compress.mtx_lznt); 1771 #ifdef CONFIG_NTFS3_LZX_XPRESS 1772 mutex_init(&sbi->compress.mtx_xpress); 1773 mutex_init(&sbi->compress.mtx_lzx); 1774 #endif 1775 1776 fc->s_fs_info = sbi; 1777 ok: 1778 fc->fs_private = opts; 1779 fc->ops = &ntfs_context_ops; 1780 1781 return 0; 1782 free_sbi: 1783 kfree(sbi); 1784 free_opts: 1785 kfree(opts); 1786 return -ENOMEM; 1787 } 1788 1789 static int ntfs_init_fs_context(struct fs_context *fc) 1790 { 1791 return __ntfs_init_fs_context(fc); 1792 } 1793 1794 static void ntfs3_kill_sb(struct super_block *sb) 1795 { 1796 struct ntfs_sb_info *sbi = sb->s_fs_info; 1797 1798 kill_block_super(sb); 1799 1800 if (sbi->options) 1801 put_mount_options(sbi->options); 1802 ntfs3_free_sbi(sbi); 1803 } 1804 1805 // clang-format off 1806 static struct file_system_type ntfs_fs_type = { 1807 .owner = THIS_MODULE, 1808 .name = "ntfs3", 1809 .init_fs_context = ntfs_init_fs_context, 1810 .parameters = ntfs_fs_parameters, 1811 .kill_sb = ntfs3_kill_sb, 1812 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1813 }; 1814 1815 #if IS_ENABLED(CONFIG_NTFS_FS) 1816 static int ntfs_legacy_init_fs_context(struct fs_context *fc) 1817 { 1818 int ret; 1819 1820 ret = __ntfs_init_fs_context(fc); 1821 /* If ntfs3 is used as legacy ntfs enforce read-only mode. */ 1822 fc->sb_flags |= SB_RDONLY; 1823 return ret; 1824 } 1825 1826 static struct file_system_type ntfs_legacy_fs_type = { 1827 .owner = THIS_MODULE, 1828 .name = "ntfs", 1829 .init_fs_context = ntfs_legacy_init_fs_context, 1830 .parameters = ntfs_fs_parameters, 1831 .kill_sb = ntfs3_kill_sb, 1832 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1833 }; 1834 MODULE_ALIAS_FS("ntfs"); 1835 1836 static inline void register_as_ntfs_legacy(void) 1837 { 1838 int err = register_filesystem(&ntfs_legacy_fs_type); 1839 if (err) 1840 pr_warn("ntfs3: Failed to register legacy ntfs filesystem driver: %d\n", err); 1841 } 1842 1843 static inline void unregister_as_ntfs_legacy(void) 1844 { 1845 unregister_filesystem(&ntfs_legacy_fs_type); 1846 } 1847 bool is_legacy_ntfs(struct super_block *sb) 1848 { 1849 return sb->s_type == &ntfs_legacy_fs_type; 1850 } 1851 #else 1852 static inline void register_as_ntfs_legacy(void) {} 1853 static inline void unregister_as_ntfs_legacy(void) {} 1854 bool is_legacy_ntfs(struct super_block *sb) { return false; } 1855 #endif 1856 1857 1858 // clang-format on 1859 1860 static int __init init_ntfs_fs(void) 1861 { 1862 int err; 1863 1864 if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL)) 1865 pr_info("ntfs3: Enabled Linux POSIX ACLs support\n"); 1866 if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER)) 1867 pr_notice( 1868 "ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n"); 1869 if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS)) 1870 pr_info("ntfs3: Read-only LZX/Xpress compression included\n"); 1871 1872 #ifdef CONFIG_PROC_FS 1873 /* Create "/proc/fs/ntfs3" */ 1874 proc_info_root = proc_mkdir("fs/ntfs3", NULL); 1875 #endif 1876 1877 err = ntfs3_init_bitmap(); 1878 if (err) 1879 return err; 1880 1881 ntfs_inode_cachep = kmem_cache_create( 1882 "ntfs_inode_cache", sizeof(struct ntfs_inode), 0, 1883 (SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT), 1884 init_once); 1885 if (!ntfs_inode_cachep) { 1886 err = -ENOMEM; 1887 goto out1; 1888 } 1889 1890 register_as_ntfs_legacy(); 1891 err = register_filesystem(&ntfs_fs_type); 1892 if (err) 1893 goto out; 1894 1895 return 0; 1896 out: 1897 kmem_cache_destroy(ntfs_inode_cachep); 1898 out1: 1899 ntfs3_exit_bitmap(); 1900 return err; 1901 } 1902 1903 static void __exit exit_ntfs_fs(void) 1904 { 1905 rcu_barrier(); 1906 kmem_cache_destroy(ntfs_inode_cachep); 1907 unregister_filesystem(&ntfs_fs_type); 1908 unregister_as_ntfs_legacy(); 1909 ntfs3_exit_bitmap(); 1910 1911 #ifdef CONFIG_PROC_FS 1912 if (proc_info_root) 1913 remove_proc_entry("fs/ntfs3", NULL); 1914 #endif 1915 } 1916 1917 MODULE_LICENSE("GPL"); 1918 MODULE_DESCRIPTION("ntfs3 read/write filesystem"); 1919 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1920 MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support"); 1921 #endif 1922 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1923 MODULE_INFO( 1924 cluster, 1925 "Warning: Activated 64 bits per cluster. Windows does not support this"); 1926 #endif 1927 #ifdef CONFIG_NTFS3_LZX_XPRESS 1928 MODULE_INFO(compression, "Read-only lzx/xpress compression included"); 1929 #endif 1930 1931 MODULE_AUTHOR("Konstantin Komarov"); 1932 MODULE_ALIAS_FS("ntfs3"); 1933 1934 module_init(init_ntfs_fs); 1935 module_exit(exit_ntfs_fs); 1936