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 const u32 name_len = ARRAY_SIZE(s_name_buf) - 1; 126 127 if (de) { 128 spin_lock(&de->d_lock); 129 snprintf(name, name_len, " \"%s\"", de->d_name.name); 130 spin_unlock(&de->d_lock); 131 name[name_len] = 0; /* To be sure. */ 132 } else { 133 name[0] = 0; 134 } 135 dput(de); /* Cocci warns if placed in branch "if (de)" */ 136 } 137 138 va_start(args, fmt); 139 140 level = printk_get_level(fmt); 141 vaf.fmt = printk_skip_level(fmt); 142 vaf.va = &args; 143 144 printk("%c%cntfs3: %s: ino=%lx,%s %pV\n", KERN_SOH_ASCII, level, 145 sb->s_id, inode->i_ino, name ? name : "", &vaf); 146 147 va_end(args); 148 149 atomic_inc(&s_name_buf_cnt); 150 if (name != s_name_buf) 151 kfree(name); 152 } 153 #endif 154 155 /* 156 * Shared memory struct. 157 * 158 * On-disk ntfs's upcase table is created by ntfs formatter. 159 * 'upcase' table is 128K bytes of memory. 160 * We should read it into memory when mounting. 161 * Several ntfs volumes likely use the same 'upcase' table. 162 * It is good idea to share in-memory 'upcase' table between different volumes. 163 * Unfortunately winxp/vista/win7 use different upcase tables. 164 */ 165 static DEFINE_SPINLOCK(s_shared_lock); 166 167 static struct { 168 void *ptr; 169 u32 len; 170 int cnt; 171 } s_shared[8]; 172 173 /* 174 * ntfs_set_shared 175 * 176 * Return: 177 * * @ptr - If pointer was saved in shared memory. 178 * * NULL - If pointer was not shared. 179 */ 180 void *ntfs_set_shared(void *ptr, u32 bytes) 181 { 182 void *ret = NULL; 183 int i, j = -1; 184 185 spin_lock(&s_shared_lock); 186 for (i = 0; i < ARRAY_SIZE(s_shared); i++) { 187 if (!s_shared[i].cnt) { 188 j = i; 189 } else if (bytes == s_shared[i].len && 190 !memcmp(s_shared[i].ptr, ptr, bytes)) { 191 s_shared[i].cnt += 1; 192 ret = s_shared[i].ptr; 193 break; 194 } 195 } 196 197 if (!ret && j != -1) { 198 s_shared[j].ptr = ptr; 199 s_shared[j].len = bytes; 200 s_shared[j].cnt = 1; 201 ret = ptr; 202 } 203 spin_unlock(&s_shared_lock); 204 205 return ret; 206 } 207 208 /* 209 * ntfs_put_shared 210 * 211 * Return: 212 * * @ptr - If pointer is not shared anymore. 213 * * NULL - If pointer is still shared. 214 */ 215 void *ntfs_put_shared(void *ptr) 216 { 217 void *ret = ptr; 218 int i; 219 220 spin_lock(&s_shared_lock); 221 for (i = 0; i < ARRAY_SIZE(s_shared); i++) { 222 if (s_shared[i].cnt && s_shared[i].ptr == ptr) { 223 if (--s_shared[i].cnt) 224 ret = NULL; 225 break; 226 } 227 } 228 spin_unlock(&s_shared_lock); 229 230 return ret; 231 } 232 233 static inline void put_mount_options(struct ntfs_mount_options *options) 234 { 235 kfree(options->nls_name); 236 unload_nls(options->nls); 237 kfree(options); 238 } 239 240 enum Opt { 241 Opt_uid, 242 Opt_gid, 243 Opt_umask, 244 Opt_dmask, 245 Opt_fmask, 246 Opt_immutable, 247 Opt_discard, 248 Opt_force, 249 Opt_sparse, 250 Opt_nohidden, 251 Opt_hide_dot_files, 252 Opt_windows_names, 253 Opt_showmeta, 254 Opt_acl, 255 Opt_iocharset, 256 Opt_prealloc, 257 Opt_nocase, 258 Opt_err, 259 }; 260 261 // clang-format off 262 static const struct fs_parameter_spec ntfs_fs_parameters[] = { 263 fsparam_u32("uid", Opt_uid), 264 fsparam_u32("gid", Opt_gid), 265 fsparam_u32oct("umask", Opt_umask), 266 fsparam_u32oct("dmask", Opt_dmask), 267 fsparam_u32oct("fmask", Opt_fmask), 268 fsparam_flag_no("sys_immutable", Opt_immutable), 269 fsparam_flag_no("discard", Opt_discard), 270 fsparam_flag_no("force", Opt_force), 271 fsparam_flag_no("sparse", Opt_sparse), 272 fsparam_flag_no("hidden", Opt_nohidden), 273 fsparam_flag_no("hide_dot_files", Opt_hide_dot_files), 274 fsparam_flag_no("windows_names", Opt_windows_names), 275 fsparam_flag_no("showmeta", Opt_showmeta), 276 fsparam_flag_no("acl", Opt_acl), 277 fsparam_string("iocharset", Opt_iocharset), 278 fsparam_flag_no("prealloc", Opt_prealloc), 279 fsparam_flag_no("nocase", Opt_nocase), 280 {} 281 }; 282 // clang-format on 283 284 /* 285 * Load nls table or if @nls is utf8 then return NULL. 286 * 287 * It is good idea to use here "const char *nls". 288 * But load_nls accepts "char*". 289 */ 290 static struct nls_table *ntfs_load_nls(char *nls) 291 { 292 struct nls_table *ret; 293 294 if (!nls) 295 nls = CONFIG_NLS_DEFAULT; 296 297 if (strcmp(nls, "utf8") == 0) 298 return NULL; 299 300 if (strcmp(nls, CONFIG_NLS_DEFAULT) == 0) 301 return load_nls_default(); 302 303 ret = load_nls(nls); 304 if (ret) 305 return ret; 306 307 return ERR_PTR(-EINVAL); 308 } 309 310 static int ntfs_fs_parse_param(struct fs_context *fc, 311 struct fs_parameter *param) 312 { 313 struct ntfs_mount_options *opts = fc->fs_private; 314 struct fs_parse_result result; 315 int opt; 316 317 opt = fs_parse(fc, ntfs_fs_parameters, param, &result); 318 if (opt < 0) 319 return opt; 320 321 switch (opt) { 322 case Opt_uid: 323 opts->fs_uid = make_kuid(current_user_ns(), result.uint_32); 324 if (!uid_valid(opts->fs_uid)) 325 return invalf(fc, "ntfs3: Invalid value for uid."); 326 break; 327 case Opt_gid: 328 opts->fs_gid = make_kgid(current_user_ns(), result.uint_32); 329 if (!gid_valid(opts->fs_gid)) 330 return invalf(fc, "ntfs3: Invalid value for 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 = result.negated ? 0 : 1; 354 break; 355 case Opt_discard: 356 opts->discard = result.negated ? 0 : 1; 357 break; 358 case Opt_force: 359 opts->force = result.negated ? 0 : 1; 360 break; 361 case Opt_sparse: 362 opts->sparse = result.negated ? 0 : 1; 363 break; 364 case Opt_nohidden: 365 opts->nohidden = result.negated ? 1 : 0; 366 break; 367 case Opt_hide_dot_files: 368 opts->hide_dot_files = result.negated ? 0 : 1; 369 break; 370 case Opt_windows_names: 371 opts->windows_names = result.negated ? 0 : 1; 372 break; 373 case Opt_showmeta: 374 opts->showmeta = result.negated ? 0 : 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 = result.negated ? 0 : 1; 394 break; 395 case Opt_nocase: 396 opts->nocase = result.negated ? 1 : 0; 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 ro_rw = sb_rdonly(sb) && !(fc->sb_flags & SB_RDONLY); 413 if (ro_rw && (sbi->flags & NTFS_FLAGS_NEED_REPLAY)) { 414 errorf(fc, 415 "ntfs3: Couldn't remount rw because journal is not replayed. Please umount/remount instead\n"); 416 return -EINVAL; 417 } 418 419 new_opts->nls = ntfs_load_nls(new_opts->nls_name); 420 if (IS_ERR(new_opts->nls)) { 421 new_opts->nls = NULL; 422 errorf(fc, "ntfs3: Cannot load iocharset %s", 423 new_opts->nls_name); 424 return -EINVAL; 425 } 426 if (new_opts->nls != sbi->options->nls) 427 return invalf( 428 fc, 429 "ntfs3: Cannot use different iocharset when remounting!"); 430 431 sync_filesystem(sb); 432 433 if (ro_rw && (sbi->volume.flags & VOLUME_FLAG_DIRTY) && 434 !new_opts->force) { 435 errorf(fc, 436 "ntfs3: Volume is dirty and \"force\" flag is not set!"); 437 return -EINVAL; 438 } 439 440 swap(sbi->options, fc->fs_private); 441 442 return 0; 443 } 444 445 #ifdef CONFIG_PROC_FS 446 static struct proc_dir_entry *proc_info_root; 447 448 /* 449 * ntfs3_volinfo: 450 * 451 * The content of /proc/fs/ntfs3/<dev>/volinfo 452 * 453 * ntfs3.1 454 * cluster size 455 * number of clusters 456 * total number of mft records 457 * number of used mft records ~= number of files + folders 458 * real state of ntfs "dirty"/"clean" 459 * current state of ntfs "dirty"/"clean" 460 */ 461 static int ntfs3_volinfo(struct seq_file *m, void *o) 462 { 463 struct super_block *sb = m->private; 464 struct ntfs_sb_info *sbi = sb->s_fs_info; 465 466 seq_printf(m, "ntfs%d.%d\n%u\n%zu\n\%zu\n%zu\n%s\n%s\n", 467 sbi->volume.major_ver, sbi->volume.minor_ver, 468 sbi->cluster_size, sbi->used.bitmap.nbits, 469 sbi->mft.bitmap.nbits, 470 sbi->mft.bitmap.nbits - wnd_zeroes(&sbi->mft.bitmap), 471 sbi->volume.real_dirty ? "dirty" : "clean", 472 (sbi->volume.flags & VOLUME_FLAG_DIRTY) ? "dirty" : "clean"); 473 474 return 0; 475 } 476 477 static int ntfs3_volinfo_open(struct inode *inode, struct file *file) 478 { 479 return single_open(file, ntfs3_volinfo, pde_data(inode)); 480 } 481 482 /* read /proc/fs/ntfs3/<dev>/label */ 483 static int ntfs3_label_show(struct seq_file *m, void *o) 484 { 485 struct super_block *sb = m->private; 486 struct ntfs_sb_info *sbi = sb->s_fs_info; 487 488 seq_printf(m, "%s\n", sbi->volume.label); 489 490 return 0; 491 } 492 493 /* write /proc/fs/ntfs3/<dev>/label */ 494 static ssize_t ntfs3_label_write(struct file *file, const char __user *buffer, 495 size_t count, loff_t *ppos) 496 { 497 int err; 498 struct super_block *sb = pde_data(file_inode(file)); 499 ssize_t ret = count; 500 u8 *label; 501 502 if (sb_rdonly(sb)) 503 return -EROFS; 504 505 label = kmalloc(count, GFP_NOFS); 506 507 if (!label) 508 return -ENOMEM; 509 510 if (copy_from_user(label, buffer, ret)) { 511 ret = -EFAULT; 512 goto out; 513 } 514 while (ret > 0 && label[ret - 1] == '\n') 515 ret -= 1; 516 517 err = ntfs_set_label(sb->s_fs_info, label, ret); 518 519 if (err < 0) { 520 ntfs_err(sb, "failed (%d) to write label", err); 521 ret = err; 522 goto out; 523 } 524 525 *ppos += count; 526 ret = count; 527 out: 528 kfree(label); 529 return ret; 530 } 531 532 static int ntfs3_label_open(struct inode *inode, struct file *file) 533 { 534 return single_open(file, ntfs3_label_show, pde_data(inode)); 535 } 536 537 static const struct proc_ops ntfs3_volinfo_fops = { 538 .proc_read = seq_read, 539 .proc_lseek = seq_lseek, 540 .proc_release = single_release, 541 .proc_open = ntfs3_volinfo_open, 542 }; 543 544 static const struct proc_ops ntfs3_label_fops = { 545 .proc_read = seq_read, 546 .proc_lseek = seq_lseek, 547 .proc_release = single_release, 548 .proc_open = ntfs3_label_open, 549 .proc_write = ntfs3_label_write, 550 }; 551 552 #endif 553 554 static struct kmem_cache *ntfs_inode_cachep; 555 556 static struct inode *ntfs_alloc_inode(struct super_block *sb) 557 { 558 struct ntfs_inode *ni = alloc_inode_sb(sb, ntfs_inode_cachep, GFP_NOFS); 559 560 if (!ni) 561 return NULL; 562 563 memset(ni, 0, offsetof(struct ntfs_inode, vfs_inode)); 564 mutex_init(&ni->ni_lock); 565 return &ni->vfs_inode; 566 } 567 568 static void ntfs_free_inode(struct inode *inode) 569 { 570 struct ntfs_inode *ni = ntfs_i(inode); 571 572 mutex_destroy(&ni->ni_lock); 573 kmem_cache_free(ntfs_inode_cachep, ni); 574 } 575 576 static void init_once(void *foo) 577 { 578 struct ntfs_inode *ni = foo; 579 580 inode_init_once(&ni->vfs_inode); 581 } 582 583 /* 584 * Noinline to reduce binary size. 585 */ 586 static noinline void ntfs3_put_sbi(struct ntfs_sb_info *sbi) 587 { 588 wnd_close(&sbi->mft.bitmap); 589 wnd_close(&sbi->used.bitmap); 590 591 if (sbi->mft.ni) { 592 iput(&sbi->mft.ni->vfs_inode); 593 sbi->mft.ni = NULL; 594 } 595 596 if (sbi->security.ni) { 597 iput(&sbi->security.ni->vfs_inode); 598 sbi->security.ni = NULL; 599 } 600 601 if (sbi->reparse.ni) { 602 iput(&sbi->reparse.ni->vfs_inode); 603 sbi->reparse.ni = NULL; 604 } 605 606 if (sbi->objid.ni) { 607 iput(&sbi->objid.ni->vfs_inode); 608 sbi->objid.ni = NULL; 609 } 610 611 if (sbi->volume.ni) { 612 iput(&sbi->volume.ni->vfs_inode); 613 sbi->volume.ni = NULL; 614 } 615 616 ntfs_update_mftmirr(sbi, 0); 617 618 indx_clear(&sbi->security.index_sii); 619 indx_clear(&sbi->security.index_sdh); 620 indx_clear(&sbi->reparse.index_r); 621 indx_clear(&sbi->objid.index_o); 622 } 623 624 static void ntfs3_free_sbi(struct ntfs_sb_info *sbi) 625 { 626 kfree(sbi->new_rec); 627 kvfree(ntfs_put_shared(sbi->upcase)); 628 kfree(sbi->def_table); 629 kfree(sbi->compress.lznt); 630 #ifdef CONFIG_NTFS3_LZX_XPRESS 631 xpress_free_decompressor(sbi->compress.xpress); 632 lzx_free_decompressor(sbi->compress.lzx); 633 #endif 634 kfree(sbi); 635 } 636 637 static void ntfs_put_super(struct super_block *sb) 638 { 639 struct ntfs_sb_info *sbi = sb->s_fs_info; 640 641 #ifdef CONFIG_PROC_FS 642 // Remove /proc/fs/ntfs3/.. 643 if (sbi->procdir) { 644 remove_proc_entry("label", sbi->procdir); 645 remove_proc_entry("volinfo", sbi->procdir); 646 remove_proc_entry(sb->s_id, proc_info_root); 647 sbi->procdir = NULL; 648 } 649 #endif 650 651 /* Mark rw ntfs as clear, if possible. */ 652 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 653 ntfs3_put_sbi(sbi); 654 } 655 656 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf) 657 { 658 struct super_block *sb = dentry->d_sb; 659 struct ntfs_sb_info *sbi = sb->s_fs_info; 660 struct wnd_bitmap *wnd = &sbi->used.bitmap; 661 662 buf->f_type = sb->s_magic; 663 buf->f_bsize = sbi->cluster_size; 664 buf->f_blocks = wnd->nbits; 665 666 buf->f_bfree = buf->f_bavail = wnd_zeroes(wnd); 667 buf->f_fsid.val[0] = sbi->volume.ser_num; 668 buf->f_fsid.val[1] = (sbi->volume.ser_num >> 32); 669 buf->f_namelen = NTFS_NAME_LEN; 670 671 return 0; 672 } 673 674 static int ntfs_show_options(struct seq_file *m, struct dentry *root) 675 { 676 struct super_block *sb = root->d_sb; 677 struct ntfs_sb_info *sbi = sb->s_fs_info; 678 struct ntfs_mount_options *opts = sbi->options; 679 struct user_namespace *user_ns = seq_user_ns(m); 680 681 seq_printf(m, ",uid=%u", from_kuid_munged(user_ns, opts->fs_uid)); 682 seq_printf(m, ",gid=%u", from_kgid_munged(user_ns, opts->fs_gid)); 683 if (opts->dmask) 684 seq_printf(m, ",dmask=%04o", opts->fs_dmask_inv ^ 0xffff); 685 if (opts->fmask) 686 seq_printf(m, ",fmask=%04o", opts->fs_fmask_inv ^ 0xffff); 687 if (opts->sys_immutable) 688 seq_puts(m, ",sys_immutable"); 689 if (opts->discard) 690 seq_puts(m, ",discard"); 691 if (opts->force) 692 seq_puts(m, ",force"); 693 if (opts->sparse) 694 seq_puts(m, ",sparse"); 695 if (opts->nohidden) 696 seq_puts(m, ",nohidden"); 697 if (opts->hide_dot_files) 698 seq_puts(m, ",hide_dot_files"); 699 if (opts->windows_names) 700 seq_puts(m, ",windows_names"); 701 if (opts->showmeta) 702 seq_puts(m, ",showmeta"); 703 if (sb->s_flags & SB_POSIXACL) 704 seq_puts(m, ",acl"); 705 if (opts->nls) 706 seq_printf(m, ",iocharset=%s", opts->nls->charset); 707 else 708 seq_puts(m, ",iocharset=utf8"); 709 if (opts->prealloc) 710 seq_puts(m, ",prealloc"); 711 if (opts->nocase) 712 seq_puts(m, ",nocase"); 713 714 return 0; 715 } 716 717 /* 718 * ntfs_sync_fs - super_operations::sync_fs 719 */ 720 static int ntfs_sync_fs(struct super_block *sb, int wait) 721 { 722 int err = 0, err2; 723 struct ntfs_sb_info *sbi = sb->s_fs_info; 724 struct ntfs_inode *ni; 725 struct inode *inode; 726 727 ni = sbi->security.ni; 728 if (ni) { 729 inode = &ni->vfs_inode; 730 err2 = _ni_write_inode(inode, wait); 731 if (err2 && !err) 732 err = err2; 733 } 734 735 ni = sbi->objid.ni; 736 if (ni) { 737 inode = &ni->vfs_inode; 738 err2 = _ni_write_inode(inode, wait); 739 if (err2 && !err) 740 err = err2; 741 } 742 743 ni = sbi->reparse.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 if (!err) 752 ntfs_set_state(sbi, NTFS_DIRTY_CLEAR); 753 754 ntfs_update_mftmirr(sbi, wait); 755 756 return err; 757 } 758 759 static const struct super_operations ntfs_sops = { 760 .alloc_inode = ntfs_alloc_inode, 761 .free_inode = ntfs_free_inode, 762 .evict_inode = ntfs_evict_inode, 763 .put_super = ntfs_put_super, 764 .statfs = ntfs_statfs, 765 .show_options = ntfs_show_options, 766 .sync_fs = ntfs_sync_fs, 767 .write_inode = ntfs3_write_inode, 768 }; 769 770 static struct inode *ntfs_export_get_inode(struct super_block *sb, u64 ino, 771 u32 generation) 772 { 773 struct MFT_REF ref; 774 struct inode *inode; 775 776 ref.low = cpu_to_le32(ino); 777 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 778 ref.high = cpu_to_le16(ino >> 32); 779 #else 780 ref.high = 0; 781 #endif 782 ref.seq = cpu_to_le16(generation); 783 784 inode = ntfs_iget5(sb, &ref, NULL); 785 if (!IS_ERR(inode) && is_bad_inode(inode)) { 786 iput(inode); 787 inode = ERR_PTR(-ESTALE); 788 } 789 790 return inode; 791 } 792 793 static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid, 794 int fh_len, int fh_type) 795 { 796 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 797 ntfs_export_get_inode); 798 } 799 800 static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid, 801 int fh_len, int fh_type) 802 { 803 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 804 ntfs_export_get_inode); 805 } 806 807 /* TODO: == ntfs_sync_inode */ 808 static int ntfs_nfs_commit_metadata(struct inode *inode) 809 { 810 return _ni_write_inode(inode, 1); 811 } 812 813 static const struct export_operations ntfs_export_ops = { 814 .fh_to_dentry = ntfs_fh_to_dentry, 815 .fh_to_parent = ntfs_fh_to_parent, 816 .get_parent = ntfs3_get_parent, 817 .commit_metadata = ntfs_nfs_commit_metadata, 818 }; 819 820 /* 821 * format_size_gb - Return Gb,Mb to print with "%u.%02u Gb". 822 */ 823 static u32 format_size_gb(const u64 bytes, u32 *mb) 824 { 825 /* Do simple right 30 bit shift of 64 bit value. */ 826 u64 kbytes = bytes >> 10; 827 u32 kbytes32 = kbytes; 828 829 *mb = (100 * (kbytes32 & 0xfffff) + 0x7ffff) >> 20; 830 if (*mb >= 100) 831 *mb = 99; 832 833 return (kbytes32 >> 20) | (((u32)(kbytes >> 32)) << 12); 834 } 835 836 static u32 true_sectors_per_clst(const struct NTFS_BOOT *boot) 837 { 838 if (boot->sectors_per_clusters <= 0x80) 839 return boot->sectors_per_clusters; 840 if (boot->sectors_per_clusters >= 0xf4) /* limit shift to 2MB max */ 841 return 1U << (-(s8)boot->sectors_per_clusters); 842 return -EINVAL; 843 } 844 845 /* 846 * ntfs_init_from_boot - Init internal info from on-disk boot sector. 847 * 848 * NTFS mount begins from boot - special formatted 512 bytes. 849 * There are two boots: the first and the last 512 bytes of volume. 850 * The content of boot is not changed during ntfs life. 851 * 852 * NOTE: ntfs.sys checks only first (primary) boot. 853 * chkdsk checks both boots. 854 */ 855 static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, 856 u64 dev_size, struct NTFS_BOOT **boot2) 857 { 858 struct ntfs_sb_info *sbi = sb->s_fs_info; 859 int err; 860 u32 mb, gb, boot_sector_size, sct_per_clst, record_size; 861 u64 sectors, clusters, mlcn, mlcn2, dev_size0; 862 struct NTFS_BOOT *boot; 863 struct buffer_head *bh; 864 struct MFT_REC *rec; 865 u16 fn, ao; 866 u8 cluster_bits; 867 u32 boot_off = 0; 868 const char *hint = "Primary boot"; 869 870 /* Save original dev_size. Used with alternative boot. */ 871 dev_size0 = dev_size; 872 873 sbi->volume.blocks = dev_size >> PAGE_SHIFT; 874 875 bh = ntfs_bread(sb, 0); 876 if (!bh) 877 return -EIO; 878 879 check_boot: 880 err = -EINVAL; 881 882 /* Corrupted image; do not read OOB */ 883 if (bh->b_size - sizeof(*boot) < boot_off) 884 goto out; 885 886 boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off); 887 888 if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) { 889 ntfs_err(sb, "%s signature is not NTFS.", hint); 890 goto out; 891 } 892 893 /* 0x55AA is not mandaroty. Thanks Maxim Suhanov*/ 894 /*if (0x55 != boot->boot_magic[0] || 0xAA != boot->boot_magic[1]) 895 * goto out; 896 */ 897 898 boot_sector_size = ((u32)boot->bytes_per_sector[1] << 8) | 899 boot->bytes_per_sector[0]; 900 if (boot_sector_size < SECTOR_SIZE || 901 !is_power_of_2(boot_sector_size)) { 902 ntfs_err(sb, "%s: invalid bytes per sector %u.", hint, 903 boot_sector_size); 904 goto out; 905 } 906 907 /* cluster size: 512, 1K, 2K, 4K, ... 2M */ 908 sct_per_clst = true_sectors_per_clst(boot); 909 if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) { 910 ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint, 911 sct_per_clst); 912 goto out; 913 } 914 915 sbi->cluster_size = boot_sector_size * sct_per_clst; 916 sbi->cluster_bits = cluster_bits = blksize_bits(sbi->cluster_size); 917 sbi->cluster_mask = sbi->cluster_size - 1; 918 sbi->cluster_mask_inv = ~(u64)sbi->cluster_mask; 919 920 mlcn = le64_to_cpu(boot->mft_clst); 921 mlcn2 = le64_to_cpu(boot->mft2_clst); 922 sectors = le64_to_cpu(boot->sectors_per_volume); 923 924 if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) { 925 ntfs_err( 926 sb, 927 "%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.", 928 hint, mlcn, mlcn2, sectors); 929 goto out; 930 } 931 932 if (boot->record_size >= 0) { 933 record_size = (u32)boot->record_size << cluster_bits; 934 } else if (-boot->record_size <= MAXIMUM_SHIFT_BYTES_PER_MFT) { 935 record_size = 1u << (-boot->record_size); 936 } else { 937 ntfs_err(sb, "%s: invalid record size %d.", hint, 938 boot->record_size); 939 goto out; 940 } 941 942 sbi->record_size = record_size; 943 sbi->record_bits = blksize_bits(record_size); 944 sbi->attr_size_tr = (5 * record_size >> 4); // ~320 bytes 945 946 /* Check MFT record size. */ 947 if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) { 948 ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint, 949 record_size, boot->record_size); 950 goto out; 951 } 952 953 if (record_size > MAXIMUM_BYTES_PER_MFT) { 954 ntfs_err(sb, "Unsupported bytes per MFT record %u.", 955 record_size); 956 goto out; 957 } 958 959 if (boot->index_size >= 0) { 960 sbi->index_size = (u32)boot->index_size << cluster_bits; 961 } else if (-boot->index_size <= MAXIMUM_SHIFT_BYTES_PER_INDEX) { 962 sbi->index_size = 1u << (-boot->index_size); 963 } else { 964 ntfs_err(sb, "%s: invalid index size %d.", hint, 965 boot->index_size); 966 goto out; 967 } 968 969 /* Check index record size. */ 970 if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) { 971 ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint, 972 sbi->index_size, boot->index_size); 973 goto out; 974 } 975 976 if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) { 977 ntfs_err(sb, "%s: unsupported bytes per index %u.", hint, 978 sbi->index_size); 979 goto out; 980 } 981 982 sbi->volume.size = sectors * boot_sector_size; 983 984 gb = format_size_gb(sbi->volume.size + boot_sector_size, &mb); 985 986 /* 987 * - Volume formatted and mounted with the same sector size. 988 * - Volume formatted 4K and mounted as 512. 989 * - Volume formatted 512 and mounted as 4K. 990 */ 991 if (boot_sector_size != sector_size) { 992 ntfs_warn( 993 sb, 994 "Different NTFS sector size (%u) and media sector size (%u).", 995 boot_sector_size, sector_size); 996 dev_size += sector_size - 1; 997 } 998 999 sbi->mft.lbo = mlcn << cluster_bits; 1000 sbi->mft.lbo2 = mlcn2 << cluster_bits; 1001 1002 /* Compare boot's cluster and sector. */ 1003 if (sbi->cluster_size < boot_sector_size) { 1004 ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint, 1005 sbi->cluster_size); 1006 goto out; 1007 } 1008 1009 /* Compare boot's cluster and media sector. */ 1010 if (sbi->cluster_size < sector_size) { 1011 /* No way to use ntfs_get_block in this case. */ 1012 ntfs_err( 1013 sb, 1014 "Failed to mount 'cause NTFS's cluster size (%u) is less than media sector size (%u).", 1015 sbi->cluster_size, sector_size); 1016 goto out; 1017 } 1018 1019 sbi->max_bytes_per_attr = 1020 record_size - ALIGN(MFTRECORD_FIXUP_OFFSET, 8) - 1021 ALIGN(((record_size >> SECTOR_SHIFT) * sizeof(short)), 8) - 1022 ALIGN(sizeof(enum ATTR_TYPE), 8); 1023 1024 sbi->volume.ser_num = le64_to_cpu(boot->serial_num); 1025 1026 /* Warning if RAW volume. */ 1027 if (dev_size < sbi->volume.size + boot_sector_size) { 1028 u32 mb0, gb0; 1029 1030 gb0 = format_size_gb(dev_size, &mb0); 1031 ntfs_warn( 1032 sb, 1033 "RAW NTFS volume: Filesystem size %u.%02u Gb > volume size %u.%02u Gb. Mount in read-only.", 1034 gb, mb, gb0, mb0); 1035 sb->s_flags |= SB_RDONLY; 1036 } 1037 1038 clusters = sbi->volume.size >> cluster_bits; 1039 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1040 /* 32 bits per cluster. */ 1041 if (clusters >> 32) { 1042 ntfs_notice( 1043 sb, 1044 "NTFS %u.%02u Gb is too big to use 32 bits per cluster.", 1045 gb, mb); 1046 goto out; 1047 } 1048 #elif BITS_PER_LONG < 64 1049 #error "CONFIG_NTFS3_64BIT_CLUSTER incompatible in 32 bit OS" 1050 #endif 1051 1052 sbi->used.bitmap.nbits = clusters; 1053 1054 rec = kzalloc(record_size, GFP_NOFS); 1055 if (!rec) { 1056 err = -ENOMEM; 1057 goto out; 1058 } 1059 1060 sbi->new_rec = rec; 1061 rec->rhdr.sign = NTFS_FILE_SIGNATURE; 1062 rec->rhdr.fix_off = cpu_to_le16(MFTRECORD_FIXUP_OFFSET); 1063 fn = (sbi->record_size >> SECTOR_SHIFT) + 1; 1064 rec->rhdr.fix_num = cpu_to_le16(fn); 1065 ao = ALIGN(MFTRECORD_FIXUP_OFFSET + sizeof(short) * fn, 8); 1066 rec->attr_off = cpu_to_le16(ao); 1067 rec->used = cpu_to_le32(ao + ALIGN(sizeof(enum ATTR_TYPE), 8)); 1068 rec->total = cpu_to_le32(sbi->record_size); 1069 ((struct ATTRIB *)Add2Ptr(rec, ao))->type = ATTR_END; 1070 1071 sb_set_blocksize(sb, min_t(u32, sbi->cluster_size, PAGE_SIZE)); 1072 1073 sbi->block_mask = sb->s_blocksize - 1; 1074 sbi->blocks_per_cluster = sbi->cluster_size >> sb->s_blocksize_bits; 1075 sbi->volume.blocks = sbi->volume.size >> sb->s_blocksize_bits; 1076 1077 /* Maximum size for normal files. */ 1078 sbi->maxbytes = (clusters << cluster_bits) - 1; 1079 1080 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1081 if (clusters >= (1ull << (64 - cluster_bits))) 1082 sbi->maxbytes = -1; 1083 sbi->maxbytes_sparse = -1; 1084 sb->s_maxbytes = MAX_LFS_FILESIZE; 1085 #else 1086 /* Maximum size for sparse file. */ 1087 sbi->maxbytes_sparse = (1ull << (cluster_bits + 32)) - 1; 1088 sb->s_maxbytes = 0xFFFFFFFFull << cluster_bits; 1089 #endif 1090 1091 /* 1092 * Compute the MFT zone at two steps. 1093 * It would be nice if we are able to allocate 1/8 of 1094 * total clusters for MFT but not more then 512 MB. 1095 */ 1096 sbi->zone_max = min_t(CLST, 0x20000000 >> cluster_bits, clusters >> 3); 1097 1098 err = 0; 1099 1100 if (bh->b_blocknr && !sb_rdonly(sb)) { 1101 /* 1102 * Alternative boot is ok but primary is not ok. 1103 * Do not update primary boot here 'cause it may be faked boot. 1104 * Let ntfs to be mounted and update boot later. 1105 */ 1106 *boot2 = kmemdup(boot, sizeof(*boot), GFP_NOFS | __GFP_NOWARN); 1107 } 1108 1109 out: 1110 if (err == -EINVAL && !bh->b_blocknr && dev_size0 > PAGE_SHIFT) { 1111 u32 block_size = min_t(u32, sector_size, PAGE_SIZE); 1112 u64 lbo = dev_size0 - sizeof(*boot); 1113 1114 /* 1115 * Try alternative boot (last sector) 1116 */ 1117 brelse(bh); 1118 1119 sb_set_blocksize(sb, block_size); 1120 bh = ntfs_bread(sb, lbo >> blksize_bits(block_size)); 1121 if (!bh) 1122 return -EINVAL; 1123 1124 boot_off = lbo & (block_size - 1); 1125 hint = "Alternative boot"; 1126 dev_size = dev_size0; /* restore original size. */ 1127 goto check_boot; 1128 } 1129 brelse(bh); 1130 1131 return err; 1132 } 1133 1134 /* 1135 * ntfs_fill_super - Try to mount. 1136 */ 1137 static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc) 1138 { 1139 int err; 1140 struct ntfs_sb_info *sbi = sb->s_fs_info; 1141 struct block_device *bdev = sb->s_bdev; 1142 struct ntfs_mount_options *options; 1143 struct inode *inode; 1144 struct ntfs_inode *ni; 1145 size_t i, tt, bad_len, bad_frags; 1146 CLST vcn, lcn, len; 1147 struct ATTRIB *attr; 1148 const struct VOLUME_INFO *info; 1149 u32 idx, done, bytes; 1150 struct ATTR_DEF_ENTRY *t; 1151 u16 *shared; 1152 struct MFT_REF ref; 1153 bool ro = sb_rdonly(sb); 1154 struct NTFS_BOOT *boot2 = NULL; 1155 1156 ref.high = 0; 1157 1158 sbi->sb = sb; 1159 sbi->options = options = fc->fs_private; 1160 fc->fs_private = NULL; 1161 sb->s_flags |= SB_NODIRATIME; 1162 sb->s_magic = 0x7366746e; // "ntfs" 1163 sb->s_op = &ntfs_sops; 1164 sb->s_export_op = &ntfs_export_ops; 1165 sb->s_time_gran = NTFS_TIME_GRAN; // 100 nsec 1166 sb->s_xattr = ntfs_xattr_handlers; 1167 sb->s_d_op = options->nocase ? &ntfs_dentry_ops : NULL; 1168 1169 options->nls = ntfs_load_nls(options->nls_name); 1170 if (IS_ERR(options->nls)) { 1171 options->nls = NULL; 1172 errorf(fc, "Cannot load nls %s", options->nls_name); 1173 err = -EINVAL; 1174 goto out; 1175 } 1176 1177 if (bdev_max_discard_sectors(bdev) && bdev_discard_granularity(bdev)) { 1178 sbi->discard_granularity = bdev_discard_granularity(bdev); 1179 sbi->discard_granularity_mask_inv = 1180 ~(u64)(sbi->discard_granularity - 1); 1181 } 1182 1183 /* Parse boot. */ 1184 err = ntfs_init_from_boot(sb, bdev_logical_block_size(bdev), 1185 bdev_nr_bytes(bdev), &boot2); 1186 if (err) 1187 goto out; 1188 1189 /* 1190 * Load $Volume. This should be done before $LogFile 1191 * 'cause 'sbi->volume.ni' is used 'ntfs_set_state'. 1192 */ 1193 ref.low = cpu_to_le32(MFT_REC_VOL); 1194 ref.seq = cpu_to_le16(MFT_REC_VOL); 1195 inode = ntfs_iget5(sb, &ref, &NAME_VOLUME); 1196 if (IS_ERR(inode)) { 1197 err = PTR_ERR(inode); 1198 ntfs_err(sb, "Failed to load $Volume (%d).", err); 1199 goto out; 1200 } 1201 1202 ni = ntfs_i(inode); 1203 1204 /* Load and save label (not necessary). */ 1205 attr = ni_find_attr(ni, NULL, NULL, ATTR_LABEL, NULL, 0, NULL, NULL); 1206 1207 if (!attr) { 1208 /* It is ok if no ATTR_LABEL */ 1209 } else if (!attr->non_res && !is_attr_ext(attr)) { 1210 /* $AttrDef allows labels to be up to 128 symbols. */ 1211 err = utf16s_to_utf8s(resident_data(attr), 1212 le32_to_cpu(attr->res.data_size) >> 1, 1213 UTF16_LITTLE_ENDIAN, sbi->volume.label, 1214 sizeof(sbi->volume.label)); 1215 if (err < 0) 1216 sbi->volume.label[0] = 0; 1217 } else { 1218 /* Should we break mounting here? */ 1219 //err = -EINVAL; 1220 //goto put_inode_out; 1221 } 1222 1223 attr = ni_find_attr(ni, attr, NULL, ATTR_VOL_INFO, NULL, 0, NULL, NULL); 1224 if (!attr || is_attr_ext(attr) || 1225 !(info = resident_data_ex(attr, SIZEOF_ATTRIBUTE_VOLUME_INFO))) { 1226 ntfs_err(sb, "$Volume is corrupted."); 1227 err = -EINVAL; 1228 goto put_inode_out; 1229 } 1230 1231 sbi->volume.major_ver = info->major_ver; 1232 sbi->volume.minor_ver = info->minor_ver; 1233 sbi->volume.flags = info->flags; 1234 sbi->volume.ni = ni; 1235 if (info->flags & VOLUME_FLAG_DIRTY) { 1236 sbi->volume.real_dirty = true; 1237 ntfs_info(sb, "It is recommened to use chkdsk."); 1238 } 1239 1240 /* Load $MFTMirr to estimate recs_mirr. */ 1241 ref.low = cpu_to_le32(MFT_REC_MIRR); 1242 ref.seq = cpu_to_le16(MFT_REC_MIRR); 1243 inode = ntfs_iget5(sb, &ref, &NAME_MIRROR); 1244 if (IS_ERR(inode)) { 1245 err = PTR_ERR(inode); 1246 ntfs_err(sb, "Failed to load $MFTMirr (%d).", err); 1247 goto out; 1248 } 1249 1250 sbi->mft.recs_mirr = ntfs_up_cluster(sbi, inode->i_size) >> 1251 sbi->record_bits; 1252 1253 iput(inode); 1254 1255 /* Load LogFile to replay. */ 1256 ref.low = cpu_to_le32(MFT_REC_LOG); 1257 ref.seq = cpu_to_le16(MFT_REC_LOG); 1258 inode = ntfs_iget5(sb, &ref, &NAME_LOGFILE); 1259 if (IS_ERR(inode)) { 1260 err = PTR_ERR(inode); 1261 ntfs_err(sb, "Failed to load \x24LogFile (%d).", err); 1262 goto out; 1263 } 1264 1265 ni = ntfs_i(inode); 1266 1267 err = ntfs_loadlog_and_replay(ni, sbi); 1268 if (err) 1269 goto put_inode_out; 1270 1271 iput(inode); 1272 1273 if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) { 1274 ntfs_warn(sb, "failed to replay log file. Can't mount rw!"); 1275 err = -EINVAL; 1276 goto out; 1277 } 1278 1279 if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) { 1280 ntfs_warn(sb, "volume is dirty and \"force\" flag is not set!"); 1281 err = -EINVAL; 1282 goto out; 1283 } 1284 1285 /* Load $MFT. */ 1286 ref.low = cpu_to_le32(MFT_REC_MFT); 1287 ref.seq = cpu_to_le16(1); 1288 1289 inode = ntfs_iget5(sb, &ref, &NAME_MFT); 1290 if (IS_ERR(inode)) { 1291 err = PTR_ERR(inode); 1292 ntfs_err(sb, "Failed to load $MFT (%d).", err); 1293 goto out; 1294 } 1295 1296 ni = ntfs_i(inode); 1297 1298 sbi->mft.used = ni->i_valid >> sbi->record_bits; 1299 tt = inode->i_size >> sbi->record_bits; 1300 sbi->mft.next_free = MFT_REC_USER; 1301 1302 err = wnd_init(&sbi->mft.bitmap, sb, tt); 1303 if (err) 1304 goto put_inode_out; 1305 1306 err = ni_load_all_mi(ni); 1307 if (err) { 1308 ntfs_err(sb, "Failed to load $MFT's subrecords (%d).", err); 1309 goto put_inode_out; 1310 } 1311 1312 sbi->mft.ni = ni; 1313 1314 /* Load $Bitmap. */ 1315 ref.low = cpu_to_le32(MFT_REC_BITMAP); 1316 ref.seq = cpu_to_le16(MFT_REC_BITMAP); 1317 inode = ntfs_iget5(sb, &ref, &NAME_BITMAP); 1318 if (IS_ERR(inode)) { 1319 err = PTR_ERR(inode); 1320 ntfs_err(sb, "Failed to load $Bitmap (%d).", err); 1321 goto out; 1322 } 1323 1324 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 1325 if (inode->i_size >> 32) { 1326 err = -EINVAL; 1327 goto put_inode_out; 1328 } 1329 #endif 1330 1331 /* Check bitmap boundary. */ 1332 tt = sbi->used.bitmap.nbits; 1333 if (inode->i_size < bitmap_size(tt)) { 1334 ntfs_err(sb, "$Bitmap is corrupted."); 1335 err = -EINVAL; 1336 goto put_inode_out; 1337 } 1338 1339 err = wnd_init(&sbi->used.bitmap, sb, tt); 1340 if (err) { 1341 ntfs_err(sb, "Failed to initialize $Bitmap (%d).", err); 1342 goto put_inode_out; 1343 } 1344 1345 iput(inode); 1346 1347 /* Compute the MFT zone. */ 1348 err = ntfs_refresh_zone(sbi); 1349 if (err) { 1350 ntfs_err(sb, "Failed to initialize MFT zone (%d).", err); 1351 goto out; 1352 } 1353 1354 /* Load $BadClus. */ 1355 ref.low = cpu_to_le32(MFT_REC_BADCLUST); 1356 ref.seq = cpu_to_le16(MFT_REC_BADCLUST); 1357 inode = ntfs_iget5(sb, &ref, &NAME_BADCLUS); 1358 if (IS_ERR(inode)) { 1359 err = PTR_ERR(inode); 1360 ntfs_err(sb, "Failed to load $BadClus (%d).", err); 1361 goto out; 1362 } 1363 1364 ni = ntfs_i(inode); 1365 bad_len = bad_frags = 0; 1366 for (i = 0; run_get_entry(&ni->file.run, i, &vcn, &lcn, &len); i++) { 1367 if (lcn == SPARSE_LCN) 1368 continue; 1369 1370 bad_len += len; 1371 bad_frags += 1; 1372 if (ro) 1373 continue; 1374 1375 if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) { 1376 /* Bad blocks marked as free in bitmap. */ 1377 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 1378 } 1379 } 1380 if (bad_len) { 1381 /* 1382 * Notice about bad blocks. 1383 * In normal cases these blocks are marked as used in bitmap. 1384 * And we never allocate space in it. 1385 */ 1386 ntfs_notice(sb, 1387 "Volume contains %zu bad blocks in %zu fragments.", 1388 bad_len, bad_frags); 1389 } 1390 iput(inode); 1391 1392 /* Load $AttrDef. */ 1393 ref.low = cpu_to_le32(MFT_REC_ATTR); 1394 ref.seq = cpu_to_le16(MFT_REC_ATTR); 1395 inode = ntfs_iget5(sb, &ref, &NAME_ATTRDEF); 1396 if (IS_ERR(inode)) { 1397 err = PTR_ERR(inode); 1398 ntfs_err(sb, "Failed to load $AttrDef (%d)", err); 1399 goto out; 1400 } 1401 1402 /* 1403 * Typical $AttrDef contains up to 20 entries. 1404 * Check for extremely large/small size. 1405 */ 1406 if (inode->i_size < sizeof(struct ATTR_DEF_ENTRY) || 1407 inode->i_size > 100 * sizeof(struct ATTR_DEF_ENTRY)) { 1408 ntfs_err(sb, "Looks like $AttrDef is corrupted (size=%llu).", 1409 inode->i_size); 1410 err = -EINVAL; 1411 goto put_inode_out; 1412 } 1413 1414 bytes = inode->i_size; 1415 sbi->def_table = t = kvmalloc(bytes, GFP_KERNEL); 1416 if (!t) { 1417 err = -ENOMEM; 1418 goto put_inode_out; 1419 } 1420 1421 for (done = idx = 0; done < bytes; done += PAGE_SIZE, idx++) { 1422 unsigned long tail = bytes - done; 1423 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1424 1425 if (IS_ERR(page)) { 1426 err = PTR_ERR(page); 1427 ntfs_err(sb, "Failed to read $AttrDef (%d).", err); 1428 goto put_inode_out; 1429 } 1430 memcpy(Add2Ptr(t, done), page_address(page), 1431 min(PAGE_SIZE, tail)); 1432 ntfs_unmap_page(page); 1433 1434 if (!idx && ATTR_STD != t->type) { 1435 ntfs_err(sb, "$AttrDef is corrupted."); 1436 err = -EINVAL; 1437 goto put_inode_out; 1438 } 1439 } 1440 1441 t += 1; 1442 sbi->def_entries = 1; 1443 done = sizeof(struct ATTR_DEF_ENTRY); 1444 sbi->reparse.max_size = MAXIMUM_REPARSE_DATA_BUFFER_SIZE; 1445 sbi->ea_max_size = 0x10000; /* default formatter value */ 1446 1447 while (done + sizeof(struct ATTR_DEF_ENTRY) <= bytes) { 1448 u32 t32 = le32_to_cpu(t->type); 1449 u64 sz = le64_to_cpu(t->max_sz); 1450 1451 if ((t32 & 0xF) || le32_to_cpu(t[-1].type) >= t32) 1452 break; 1453 1454 if (t->type == ATTR_REPARSE) 1455 sbi->reparse.max_size = sz; 1456 else if (t->type == ATTR_EA) 1457 sbi->ea_max_size = sz; 1458 1459 done += sizeof(struct ATTR_DEF_ENTRY); 1460 t += 1; 1461 sbi->def_entries += 1; 1462 } 1463 iput(inode); 1464 1465 /* Load $UpCase. */ 1466 ref.low = cpu_to_le32(MFT_REC_UPCASE); 1467 ref.seq = cpu_to_le16(MFT_REC_UPCASE); 1468 inode = ntfs_iget5(sb, &ref, &NAME_UPCASE); 1469 if (IS_ERR(inode)) { 1470 err = PTR_ERR(inode); 1471 ntfs_err(sb, "Failed to load $UpCase (%d).", err); 1472 goto out; 1473 } 1474 1475 if (inode->i_size != 0x10000 * sizeof(short)) { 1476 err = -EINVAL; 1477 ntfs_err(sb, "$UpCase is corrupted."); 1478 goto put_inode_out; 1479 } 1480 1481 for (idx = 0; idx < (0x10000 * sizeof(short) >> PAGE_SHIFT); idx++) { 1482 const __le16 *src; 1483 u16 *dst = Add2Ptr(sbi->upcase, idx << PAGE_SHIFT); 1484 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1485 1486 if (IS_ERR(page)) { 1487 err = PTR_ERR(page); 1488 ntfs_err(sb, "Failed to read $UpCase (%d).", err); 1489 goto put_inode_out; 1490 } 1491 1492 src = page_address(page); 1493 1494 #ifdef __BIG_ENDIAN 1495 for (i = 0; i < PAGE_SIZE / sizeof(u16); i++) 1496 *dst++ = le16_to_cpu(*src++); 1497 #else 1498 memcpy(dst, src, PAGE_SIZE); 1499 #endif 1500 ntfs_unmap_page(page); 1501 } 1502 1503 shared = ntfs_set_shared(sbi->upcase, 0x10000 * sizeof(short)); 1504 if (shared && sbi->upcase != shared) { 1505 kvfree(sbi->upcase); 1506 sbi->upcase = shared; 1507 } 1508 1509 iput(inode); 1510 1511 if (is_ntfs3(sbi)) { 1512 /* Load $Secure. */ 1513 err = ntfs_security_init(sbi); 1514 if (err) { 1515 ntfs_err(sb, "Failed to initialize $Secure (%d).", err); 1516 goto out; 1517 } 1518 1519 /* Load $Extend. */ 1520 err = ntfs_extend_init(sbi); 1521 if (err) { 1522 ntfs_warn(sb, "Failed to initialize $Extend."); 1523 goto load_root; 1524 } 1525 1526 /* Load $Extend/$Reparse. */ 1527 err = ntfs_reparse_init(sbi); 1528 if (err) { 1529 ntfs_warn(sb, "Failed to initialize $Extend/$Reparse."); 1530 goto load_root; 1531 } 1532 1533 /* Load $Extend/$ObjId. */ 1534 err = ntfs_objid_init(sbi); 1535 if (err) { 1536 ntfs_warn(sb, "Failed to initialize $Extend/$ObjId."); 1537 goto load_root; 1538 } 1539 } 1540 1541 load_root: 1542 /* Load root. */ 1543 ref.low = cpu_to_le32(MFT_REC_ROOT); 1544 ref.seq = cpu_to_le16(MFT_REC_ROOT); 1545 inode = ntfs_iget5(sb, &ref, &NAME_ROOT); 1546 if (IS_ERR(inode)) { 1547 err = PTR_ERR(inode); 1548 ntfs_err(sb, "Failed to load root (%d).", err); 1549 goto out; 1550 } 1551 1552 /* 1553 * Final check. Looks like this case should never occurs. 1554 */ 1555 if (!inode->i_op) { 1556 err = -EINVAL; 1557 ntfs_err(sb, "Failed to load root (%d).", err); 1558 goto put_inode_out; 1559 } 1560 1561 sb->s_root = d_make_root(inode); 1562 if (!sb->s_root) { 1563 err = -ENOMEM; 1564 goto put_inode_out; 1565 } 1566 1567 if (boot2) { 1568 /* 1569 * Alternative boot is ok but primary is not ok. 1570 * Volume is recognized as NTFS. Update primary boot. 1571 */ 1572 struct buffer_head *bh0 = sb_getblk(sb, 0); 1573 if (bh0) { 1574 if (buffer_locked(bh0)) 1575 __wait_on_buffer(bh0); 1576 1577 lock_buffer(bh0); 1578 memcpy(bh0->b_data, boot2, sizeof(*boot2)); 1579 set_buffer_uptodate(bh0); 1580 mark_buffer_dirty(bh0); 1581 unlock_buffer(bh0); 1582 if (!sync_dirty_buffer(bh0)) 1583 ntfs_warn(sb, "primary boot is updated"); 1584 put_bh(bh0); 1585 } 1586 1587 kfree(boot2); 1588 } 1589 1590 #ifdef CONFIG_PROC_FS 1591 /* Create /proc/fs/ntfs3/.. */ 1592 if (proc_info_root) { 1593 struct proc_dir_entry *e = proc_mkdir(sb->s_id, proc_info_root); 1594 static_assert((S_IRUGO | S_IWUSR) == 0644); 1595 if (e) { 1596 proc_create_data("volinfo", S_IRUGO, e, 1597 &ntfs3_volinfo_fops, sb); 1598 proc_create_data("label", S_IRUGO | S_IWUSR, e, 1599 &ntfs3_label_fops, sb); 1600 sbi->procdir = e; 1601 } 1602 } 1603 #endif 1604 1605 return 0; 1606 1607 put_inode_out: 1608 iput(inode); 1609 out: 1610 ntfs3_put_sbi(sbi); 1611 kfree(boot2); 1612 ntfs3_put_sbi(sbi); 1613 return err; 1614 } 1615 1616 void ntfs_unmap_meta(struct super_block *sb, CLST lcn, CLST len) 1617 { 1618 struct ntfs_sb_info *sbi = sb->s_fs_info; 1619 struct block_device *bdev = sb->s_bdev; 1620 sector_t devblock = (u64)lcn * sbi->blocks_per_cluster; 1621 unsigned long blocks = (u64)len * sbi->blocks_per_cluster; 1622 unsigned long cnt = 0; 1623 unsigned long limit = global_zone_page_state(NR_FREE_PAGES) 1624 << (PAGE_SHIFT - sb->s_blocksize_bits); 1625 1626 if (limit >= 0x2000) 1627 limit -= 0x1000; 1628 else if (limit < 32) 1629 limit = 32; 1630 else 1631 limit >>= 1; 1632 1633 while (blocks--) { 1634 clean_bdev_aliases(bdev, devblock++, 1); 1635 if (cnt++ >= limit) { 1636 sync_blockdev(bdev); 1637 cnt = 0; 1638 } 1639 } 1640 } 1641 1642 /* 1643 * ntfs_discard - Issue a discard request (trim for SSD). 1644 */ 1645 int ntfs_discard(struct ntfs_sb_info *sbi, CLST lcn, CLST len) 1646 { 1647 int err; 1648 u64 lbo, bytes, start, end; 1649 struct super_block *sb; 1650 1651 if (sbi->used.next_free_lcn == lcn + len) 1652 sbi->used.next_free_lcn = lcn; 1653 1654 if (sbi->flags & NTFS_FLAGS_NODISCARD) 1655 return -EOPNOTSUPP; 1656 1657 if (!sbi->options->discard) 1658 return -EOPNOTSUPP; 1659 1660 lbo = (u64)lcn << sbi->cluster_bits; 1661 bytes = (u64)len << sbi->cluster_bits; 1662 1663 /* Align up 'start' on discard_granularity. */ 1664 start = (lbo + sbi->discard_granularity - 1) & 1665 sbi->discard_granularity_mask_inv; 1666 /* Align down 'end' on discard_granularity. */ 1667 end = (lbo + bytes) & sbi->discard_granularity_mask_inv; 1668 1669 sb = sbi->sb; 1670 if (start >= end) 1671 return 0; 1672 1673 err = blkdev_issue_discard(sb->s_bdev, start >> 9, (end - start) >> 9, 1674 GFP_NOFS); 1675 1676 if (err == -EOPNOTSUPP) 1677 sbi->flags |= NTFS_FLAGS_NODISCARD; 1678 1679 return err; 1680 } 1681 1682 static int ntfs_fs_get_tree(struct fs_context *fc) 1683 { 1684 return get_tree_bdev(fc, ntfs_fill_super); 1685 } 1686 1687 /* 1688 * ntfs_fs_free - Free fs_context. 1689 * 1690 * Note that this will be called after fill_super and reconfigure 1691 * even when they pass. So they have to take pointers if they pass. 1692 */ 1693 static void ntfs_fs_free(struct fs_context *fc) 1694 { 1695 struct ntfs_mount_options *opts = fc->fs_private; 1696 struct ntfs_sb_info *sbi = fc->s_fs_info; 1697 1698 if (sbi) { 1699 ntfs3_put_sbi(sbi); 1700 ntfs3_free_sbi(sbi); 1701 } 1702 1703 if (opts) 1704 put_mount_options(opts); 1705 } 1706 1707 // clang-format off 1708 static const struct fs_context_operations ntfs_context_ops = { 1709 .parse_param = ntfs_fs_parse_param, 1710 .get_tree = ntfs_fs_get_tree, 1711 .reconfigure = ntfs_fs_reconfigure, 1712 .free = ntfs_fs_free, 1713 }; 1714 // clang-format on 1715 1716 /* 1717 * ntfs_init_fs_context - Initialize sbi and opts 1718 * 1719 * This will called when mount/remount. We will first initialize 1720 * options so that if remount we can use just that. 1721 */ 1722 static int ntfs_init_fs_context(struct fs_context *fc) 1723 { 1724 struct ntfs_mount_options *opts; 1725 struct ntfs_sb_info *sbi; 1726 1727 opts = kzalloc(sizeof(struct ntfs_mount_options), GFP_NOFS); 1728 if (!opts) 1729 return -ENOMEM; 1730 1731 /* Default options. */ 1732 opts->fs_uid = current_uid(); 1733 opts->fs_gid = current_gid(); 1734 opts->fs_fmask_inv = ~current_umask(); 1735 opts->fs_dmask_inv = ~current_umask(); 1736 1737 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) 1738 goto ok; 1739 1740 sbi = kzalloc(sizeof(struct ntfs_sb_info), GFP_NOFS); 1741 if (!sbi) 1742 goto free_opts; 1743 1744 sbi->upcase = kvmalloc(0x10000 * sizeof(short), GFP_KERNEL); 1745 if (!sbi->upcase) 1746 goto free_sbi; 1747 1748 ratelimit_state_init(&sbi->msg_ratelimit, DEFAULT_RATELIMIT_INTERVAL, 1749 DEFAULT_RATELIMIT_BURST); 1750 1751 mutex_init(&sbi->compress.mtx_lznt); 1752 #ifdef CONFIG_NTFS3_LZX_XPRESS 1753 mutex_init(&sbi->compress.mtx_xpress); 1754 mutex_init(&sbi->compress.mtx_lzx); 1755 #endif 1756 1757 fc->s_fs_info = sbi; 1758 ok: 1759 fc->fs_private = opts; 1760 fc->ops = &ntfs_context_ops; 1761 1762 return 0; 1763 free_sbi: 1764 kfree(sbi); 1765 free_opts: 1766 kfree(opts); 1767 return -ENOMEM; 1768 } 1769 1770 static void ntfs3_kill_sb(struct super_block *sb) 1771 { 1772 struct ntfs_sb_info *sbi = sb->s_fs_info; 1773 1774 kill_block_super(sb); 1775 1776 if (sbi->options) 1777 put_mount_options(sbi->options); 1778 ntfs3_free_sbi(sbi); 1779 } 1780 1781 // clang-format off 1782 static struct file_system_type ntfs_fs_type = { 1783 .owner = THIS_MODULE, 1784 .name = "ntfs3", 1785 .init_fs_context = ntfs_init_fs_context, 1786 .parameters = ntfs_fs_parameters, 1787 .kill_sb = ntfs3_kill_sb, 1788 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, 1789 }; 1790 // clang-format on 1791 1792 static int __init init_ntfs_fs(void) 1793 { 1794 int err; 1795 1796 pr_info("ntfs3: Max link count %u\n", NTFS_LINK_MAX); 1797 1798 if (IS_ENABLED(CONFIG_NTFS3_FS_POSIX_ACL)) 1799 pr_info("ntfs3: Enabled Linux POSIX ACLs support\n"); 1800 if (IS_ENABLED(CONFIG_NTFS3_64BIT_CLUSTER)) 1801 pr_notice( 1802 "ntfs3: Warning: Activated 64 bits per cluster. Windows does not support this\n"); 1803 if (IS_ENABLED(CONFIG_NTFS3_LZX_XPRESS)) 1804 pr_info("ntfs3: Read-only LZX/Xpress compression included\n"); 1805 1806 #ifdef CONFIG_PROC_FS 1807 /* Create "/proc/fs/ntfs3" */ 1808 proc_info_root = proc_mkdir("fs/ntfs3", NULL); 1809 #endif 1810 1811 err = ntfs3_init_bitmap(); 1812 if (err) 1813 return err; 1814 1815 ntfs_inode_cachep = kmem_cache_create( 1816 "ntfs_inode_cache", sizeof(struct ntfs_inode), 0, 1817 (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT), 1818 init_once); 1819 if (!ntfs_inode_cachep) { 1820 err = -ENOMEM; 1821 goto out1; 1822 } 1823 1824 err = register_filesystem(&ntfs_fs_type); 1825 if (err) 1826 goto out; 1827 1828 return 0; 1829 out: 1830 kmem_cache_destroy(ntfs_inode_cachep); 1831 out1: 1832 ntfs3_exit_bitmap(); 1833 return err; 1834 } 1835 1836 static void __exit exit_ntfs_fs(void) 1837 { 1838 rcu_barrier(); 1839 kmem_cache_destroy(ntfs_inode_cachep); 1840 unregister_filesystem(&ntfs_fs_type); 1841 ntfs3_exit_bitmap(); 1842 1843 #ifdef CONFIG_PROC_FS 1844 if (proc_info_root) 1845 remove_proc_entry("fs/ntfs3", NULL); 1846 #endif 1847 } 1848 1849 MODULE_LICENSE("GPL"); 1850 MODULE_DESCRIPTION("ntfs3 read/write filesystem"); 1851 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1852 MODULE_INFO(behaviour, "Enabled Linux POSIX ACLs support"); 1853 #endif 1854 #ifdef CONFIG_NTFS3_64BIT_CLUSTER 1855 MODULE_INFO( 1856 cluster, 1857 "Warning: Activated 64 bits per cluster. Windows does not support this"); 1858 #endif 1859 #ifdef CONFIG_NTFS3_LZX_XPRESS 1860 MODULE_INFO(compression, "Read-only lzx/xpress compression included"); 1861 #endif 1862 1863 MODULE_AUTHOR("Konstantin Komarov"); 1864 MODULE_ALIAS_FS("ntfs3"); 1865 1866 module_init(init_ntfs_fs); 1867 module_exit(exit_ntfs_fs); 1868