1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 */ 7 8 #include <linux/buffer_head.h> 9 #include <linux/fs.h> 10 #include <linux/mpage.h> 11 #include <linux/namei.h> 12 #include <linux/nls.h> 13 #include <linux/uio.h> 14 #include <linux/writeback.h> 15 16 #include "debug.h" 17 #include "ntfs.h" 18 #include "ntfs_fs.h" 19 20 /* 21 * ntfs_read_mft - Read record and parses MFT. 22 */ 23 static struct inode *ntfs_read_mft(struct inode *inode, 24 const struct cpu_str *name, 25 const struct MFT_REF *ref) 26 { 27 int err = 0; 28 struct ntfs_inode *ni = ntfs_i(inode); 29 struct super_block *sb = inode->i_sb; 30 struct ntfs_sb_info *sbi = sb->s_fs_info; 31 mode_t mode = 0; 32 struct ATTR_STD_INFO5 *std5 = NULL; 33 struct ATTR_LIST_ENTRY *le; 34 struct ATTRIB *attr; 35 bool is_match = false; 36 bool is_root = false; 37 bool is_dir; 38 unsigned long ino = inode->i_ino; 39 u32 rp_fa = 0, asize, t32; 40 u16 roff, rsize, names = 0; 41 const struct ATTR_FILE_NAME *fname = NULL; 42 const struct INDEX_ROOT *root; 43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes 44 u64 t64; 45 struct MFT_REC *rec; 46 struct runs_tree *run; 47 48 inode->i_op = NULL; 49 /* Setup 'uid' and 'gid' */ 50 inode->i_uid = sbi->options->fs_uid; 51 inode->i_gid = sbi->options->fs_gid; 52 53 err = mi_init(&ni->mi, sbi, ino); 54 if (err) 55 goto out; 56 57 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) { 58 t64 = sbi->mft.lbo >> sbi->cluster_bits; 59 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size); 60 sbi->mft.ni = ni; 61 init_rwsem(&ni->file.run_lock); 62 63 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) { 64 err = -ENOMEM; 65 goto out; 66 } 67 } 68 69 err = mi_read(&ni->mi, ino == MFT_REC_MFT); 70 71 if (err) 72 goto out; 73 74 rec = ni->mi.mrec; 75 76 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) { 77 ; 78 } else if (ref->seq != rec->seq) { 79 err = -EINVAL; 80 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino, 81 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq)); 82 goto out; 83 } else if (!is_rec_inuse(rec)) { 84 err = -EINVAL; 85 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino); 86 goto out; 87 } 88 89 if (le32_to_cpu(rec->total) != sbi->record_size) { 90 /* Bad inode? */ 91 err = -EINVAL; 92 goto out; 93 } 94 95 if (!is_rec_base(rec)) 96 goto Ok; 97 98 /* Record should contain $I30 root. */ 99 is_dir = rec->flags & RECORD_FLAG_DIR; 100 101 inode->i_generation = le16_to_cpu(rec->seq); 102 103 /* Enumerate all struct Attributes MFT. */ 104 le = NULL; 105 attr = NULL; 106 107 /* 108 * To reduce tab pressure use goto instead of 109 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) )) 110 */ 111 next_attr: 112 run = NULL; 113 err = -EINVAL; 114 attr = ni_enum_attr_ex(ni, attr, &le, NULL); 115 if (!attr) 116 goto end_enum; 117 118 if (le && le->vcn) { 119 /* This is non primary attribute segment. Ignore if not MFT. */ 120 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA) 121 goto next_attr; 122 123 run = &ni->file.run; 124 asize = le32_to_cpu(attr->size); 125 goto attr_unpack_run; 126 } 127 128 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off); 129 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size); 130 asize = le32_to_cpu(attr->size); 131 132 switch (attr->type) { 133 case ATTR_STD: 134 if (attr->non_res || 135 asize < sizeof(struct ATTR_STD_INFO) + roff || 136 rsize < sizeof(struct ATTR_STD_INFO)) 137 goto out; 138 139 if (std5) 140 goto next_attr; 141 142 std5 = Add2Ptr(attr, roff); 143 144 #ifdef STATX_BTIME 145 nt2kernel(std5->cr_time, &ni->i_crtime); 146 #endif 147 nt2kernel(std5->a_time, &inode->i_atime); 148 nt2kernel(std5->c_time, &inode->i_ctime); 149 nt2kernel(std5->m_time, &inode->i_mtime); 150 151 ni->std_fa = std5->fa; 152 153 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && 154 rsize >= sizeof(struct ATTR_STD_INFO5)) 155 ni->std_security_id = std5->security_id; 156 goto next_attr; 157 158 case ATTR_LIST: 159 if (attr->name_len || le || ino == MFT_REC_LOG) 160 goto out; 161 162 err = ntfs_load_attr_list(ni, attr); 163 if (err) 164 goto out; 165 166 le = NULL; 167 attr = NULL; 168 goto next_attr; 169 170 case ATTR_NAME: 171 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || 172 rsize < SIZEOF_ATTRIBUTE_FILENAME) 173 goto out; 174 175 fname = Add2Ptr(attr, roff); 176 if (fname->type == FILE_NAME_DOS) 177 goto next_attr; 178 179 names += 1; 180 if (name && name->len == fname->name_len && 181 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, 182 NULL, false)) 183 is_match = true; 184 185 goto next_attr; 186 187 case ATTR_DATA: 188 if (is_dir) { 189 /* Ignore data attribute in dir record. */ 190 goto next_attr; 191 } 192 193 if (ino == MFT_REC_BADCLUST && !attr->non_res) 194 goto next_attr; 195 196 if (attr->name_len && 197 ((ino != MFT_REC_BADCLUST || !attr->non_res || 198 attr->name_len != ARRAY_SIZE(BAD_NAME) || 199 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && 200 (ino != MFT_REC_SECURE || !attr->non_res || 201 attr->name_len != ARRAY_SIZE(SDS_NAME) || 202 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { 203 /* File contains stream attribute. Ignore it. */ 204 goto next_attr; 205 } 206 207 if (is_attr_sparsed(attr)) 208 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; 209 else 210 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; 211 212 if (is_attr_compressed(attr)) 213 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; 214 else 215 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; 216 217 if (is_attr_encrypted(attr)) 218 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; 219 else 220 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; 221 222 if (!attr->non_res) { 223 ni->i_valid = inode->i_size = rsize; 224 inode_set_bytes(inode, rsize); 225 } 226 227 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); 228 229 if (!attr->non_res) { 230 ni->ni_flags |= NI_FLAG_RESIDENT; 231 goto next_attr; 232 } 233 234 inode_set_bytes(inode, attr_ondisk_size(attr)); 235 236 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 237 inode->i_size = le64_to_cpu(attr->nres.data_size); 238 if (!attr->nres.alloc_size) 239 goto next_attr; 240 241 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run 242 : &ni->file.run; 243 break; 244 245 case ATTR_ROOT: 246 if (attr->non_res) 247 goto out; 248 249 root = Add2Ptr(attr, roff); 250 is_root = true; 251 252 if (attr->name_len != ARRAY_SIZE(I30_NAME) || 253 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 254 goto next_attr; 255 256 if (root->type != ATTR_NAME || 257 root->rule != NTFS_COLLATION_TYPE_FILENAME) 258 goto out; 259 260 if (!is_dir) 261 goto next_attr; 262 263 ni->ni_flags |= NI_FLAG_DIR; 264 265 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 266 if (err) 267 goto out; 268 269 mode = sb->s_root 270 ? (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) 271 : (S_IFDIR | 0777); 272 goto next_attr; 273 274 case ATTR_ALLOC: 275 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || 276 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 277 goto next_attr; 278 279 inode->i_size = le64_to_cpu(attr->nres.data_size); 280 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 281 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); 282 283 run = &ni->dir.alloc_run; 284 break; 285 286 case ATTR_BITMAP: 287 if (ino == MFT_REC_MFT) { 288 if (!attr->non_res) 289 goto out; 290 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 291 /* 0x20000000 = 2^32 / 8 */ 292 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) 293 goto out; 294 #endif 295 run = &sbi->mft.bitmap.run; 296 break; 297 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && 298 !memcmp(attr_name(attr), I30_NAME, 299 sizeof(I30_NAME)) && 300 attr->non_res) { 301 run = &ni->dir.bitmap_run; 302 break; 303 } 304 goto next_attr; 305 306 case ATTR_REPARSE: 307 if (attr->name_len) 308 goto next_attr; 309 310 rp_fa = ni_parse_reparse(ni, attr, &rp); 311 switch (rp_fa) { 312 case REPARSE_LINK: 313 /* 314 * Normal symlink. 315 * Assume one unicode symbol == one utf8. 316 */ 317 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer 318 .PrintNameLength) / 319 sizeof(u16); 320 321 ni->i_valid = inode->i_size; 322 323 /* Clear directory bit. */ 324 if (ni->ni_flags & NI_FLAG_DIR) { 325 indx_clear(&ni->dir); 326 memset(&ni->dir, 0, sizeof(ni->dir)); 327 ni->ni_flags &= ~NI_FLAG_DIR; 328 } else { 329 run_close(&ni->file.run); 330 } 331 mode = S_IFLNK | 0777; 332 is_dir = false; 333 if (attr->non_res) { 334 run = &ni->file.run; 335 goto attr_unpack_run; // Double break. 336 } 337 break; 338 339 case REPARSE_COMPRESSED: 340 break; 341 342 case REPARSE_DEDUPLICATED: 343 break; 344 } 345 goto next_attr; 346 347 case ATTR_EA_INFO: 348 if (!attr->name_len && 349 resident_data_ex(attr, sizeof(struct EA_INFO))) { 350 ni->ni_flags |= NI_FLAG_EA; 351 /* 352 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode 353 */ 354 inode->i_mode = mode; 355 ntfs_get_wsl_perm(inode); 356 mode = inode->i_mode; 357 } 358 goto next_attr; 359 360 default: 361 goto next_attr; 362 } 363 364 attr_unpack_run: 365 roff = le16_to_cpu(attr->nres.run_off); 366 367 t64 = le64_to_cpu(attr->nres.svcn); 368 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), 369 t64, Add2Ptr(attr, roff), asize - roff); 370 if (err < 0) 371 goto out; 372 err = 0; 373 goto next_attr; 374 375 end_enum: 376 377 if (!std5) 378 goto out; 379 380 if (!is_match && name) { 381 /* Reuse rec as buffer for ascii name. */ 382 err = -ENOENT; 383 goto out; 384 } 385 386 if (std5->fa & FILE_ATTRIBUTE_READONLY) 387 mode &= ~0222; 388 389 if (!names) { 390 err = -EINVAL; 391 goto out; 392 } 393 394 if (names != le16_to_cpu(rec->hard_links)) { 395 /* Correct minor error on the fly. Do not mark inode as dirty. */ 396 rec->hard_links = cpu_to_le16(names); 397 ni->mi.dirty = true; 398 } 399 400 set_nlink(inode, names); 401 402 if (S_ISDIR(mode)) { 403 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; 404 405 /* 406 * Dot and dot-dot should be included in count but was not 407 * included in enumeration. 408 * Usually a hard links to directories are disabled. 409 */ 410 inode->i_op = &ntfs_dir_inode_operations; 411 inode->i_fop = &ntfs_dir_operations; 412 ni->i_valid = 0; 413 } else if (S_ISLNK(mode)) { 414 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 415 inode->i_op = &ntfs_link_inode_operations; 416 inode->i_fop = NULL; 417 inode_nohighmem(inode); 418 } else if (S_ISREG(mode)) { 419 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 420 inode->i_op = &ntfs_file_inode_operations; 421 inode->i_fop = &ntfs_file_operations; 422 inode->i_mapping->a_ops = 423 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops; 424 if (ino != MFT_REC_MFT) 425 init_rwsem(&ni->file.run_lock); 426 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || 427 S_ISSOCK(mode)) { 428 inode->i_op = &ntfs_special_inode_operations; 429 init_special_inode(inode, mode, inode->i_rdev); 430 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && 431 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { 432 /* Records in $Extend are not a files or general directories. */ 433 } else { 434 err = -EINVAL; 435 goto out; 436 } 437 438 if ((sbi->options->sys_immutable && 439 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 440 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 441 inode->i_flags |= S_IMMUTABLE; 442 } else { 443 inode->i_flags &= ~S_IMMUTABLE; 444 } 445 446 inode->i_mode = mode; 447 if (!(ni->ni_flags & NI_FLAG_EA)) { 448 /* If no xattr then no security (stored in xattr). */ 449 inode->i_flags |= S_NOSEC; 450 } 451 452 Ok: 453 if (ino == MFT_REC_MFT && !sb->s_root) 454 sbi->mft.ni = NULL; 455 456 unlock_new_inode(inode); 457 458 return inode; 459 460 out: 461 if (ino == MFT_REC_MFT && !sb->s_root) 462 sbi->mft.ni = NULL; 463 464 iget_failed(inode); 465 return ERR_PTR(err); 466 } 467 468 /* 469 * ntfs_test_inode 470 * 471 * Return: 1 if match. 472 */ 473 static int ntfs_test_inode(struct inode *inode, void *data) 474 { 475 struct MFT_REF *ref = data; 476 477 return ino_get(ref) == inode->i_ino; 478 } 479 480 static int ntfs_set_inode(struct inode *inode, void *data) 481 { 482 const struct MFT_REF *ref = data; 483 484 inode->i_ino = ino_get(ref); 485 return 0; 486 } 487 488 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 489 const struct cpu_str *name) 490 { 491 struct inode *inode; 492 493 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 494 (void *)ref); 495 if (unlikely(!inode)) 496 return ERR_PTR(-ENOMEM); 497 498 /* If this is a freshly allocated inode, need to read it now. */ 499 if (inode->i_state & I_NEW) 500 inode = ntfs_read_mft(inode, name, ref); 501 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 502 /* Inode overlaps? */ 503 make_bad_inode(inode); 504 } 505 506 return inode; 507 } 508 509 enum get_block_ctx { 510 GET_BLOCK_GENERAL = 0, 511 GET_BLOCK_WRITE_BEGIN = 1, 512 GET_BLOCK_DIRECT_IO_R = 2, 513 GET_BLOCK_DIRECT_IO_W = 3, 514 GET_BLOCK_BMAP = 4, 515 }; 516 517 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 518 struct buffer_head *bh, int create, 519 enum get_block_ctx ctx) 520 { 521 struct super_block *sb = inode->i_sb; 522 struct ntfs_sb_info *sbi = sb->s_fs_info; 523 struct ntfs_inode *ni = ntfs_i(inode); 524 struct page *page = bh->b_page; 525 u8 cluster_bits = sbi->cluster_bits; 526 u32 block_size = sb->s_blocksize; 527 u64 bytes, lbo, valid; 528 u32 off; 529 int err; 530 CLST vcn, lcn, len; 531 bool new; 532 533 /* Clear previous state. */ 534 clear_buffer_new(bh); 535 clear_buffer_uptodate(bh); 536 537 /* Direct write uses 'create=0'. */ 538 if (!create && vbo >= ni->i_valid) { 539 /* Out of valid. */ 540 return 0; 541 } 542 543 if (vbo >= inode->i_size) { 544 /* Out of size. */ 545 return 0; 546 } 547 548 if (is_resident(ni)) { 549 ni_lock(ni); 550 err = attr_data_read_resident(ni, page); 551 ni_unlock(ni); 552 553 if (!err) 554 set_buffer_uptodate(bh); 555 bh->b_size = block_size; 556 return err; 557 } 558 559 vcn = vbo >> cluster_bits; 560 off = vbo & sbi->cluster_mask; 561 new = false; 562 563 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL); 564 if (err) 565 goto out; 566 567 if (!len) 568 return 0; 569 570 bytes = ((u64)len << cluster_bits) - off; 571 572 if (lcn == SPARSE_LCN) { 573 if (!create) { 574 if (bh->b_size > bytes) 575 bh->b_size = bytes; 576 return 0; 577 } 578 WARN_ON(1); 579 } 580 581 if (new) { 582 set_buffer_new(bh); 583 if ((len << cluster_bits) > block_size) 584 ntfs_sparse_cluster(inode, page, vcn, len); 585 } 586 587 lbo = ((u64)lcn << cluster_bits) + off; 588 589 set_buffer_mapped(bh); 590 bh->b_bdev = sb->s_bdev; 591 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 592 593 valid = ni->i_valid; 594 595 if (ctx == GET_BLOCK_DIRECT_IO_W) { 596 /* ntfs_direct_IO will update ni->i_valid. */ 597 if (vbo >= valid) 598 set_buffer_new(bh); 599 } else if (create) { 600 /* Normal write. */ 601 if (bytes > bh->b_size) 602 bytes = bh->b_size; 603 604 if (vbo >= valid) 605 set_buffer_new(bh); 606 607 if (vbo + bytes > valid) { 608 ni->i_valid = vbo + bytes; 609 mark_inode_dirty(inode); 610 } 611 } else if (vbo >= valid) { 612 /* Read out of valid data. */ 613 /* Should never be here 'cause already checked. */ 614 clear_buffer_mapped(bh); 615 } else if (vbo + bytes <= valid) { 616 /* Normal read. */ 617 } else if (vbo + block_size <= valid) { 618 /* Normal short read. */ 619 bytes = block_size; 620 } else { 621 /* 622 * Read across valid size: vbo < valid && valid < vbo + block_size 623 */ 624 bytes = block_size; 625 626 if (page) { 627 u32 voff = valid - vbo; 628 629 bh->b_size = block_size; 630 off = vbo & (PAGE_SIZE - 1); 631 set_bh_page(bh, page, off); 632 ll_rw_block(REQ_OP_READ, 0, 1, &bh); 633 wait_on_buffer(bh); 634 if (!buffer_uptodate(bh)) { 635 err = -EIO; 636 goto out; 637 } 638 zero_user_segment(page, off + voff, off + block_size); 639 } 640 } 641 642 if (bh->b_size > bytes) 643 bh->b_size = bytes; 644 645 #ifndef __LP64__ 646 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 647 static_assert(sizeof(size_t) < sizeof(loff_t)); 648 if (bytes > 0x40000000u) 649 bh->b_size = 0x40000000u; 650 } 651 #endif 652 653 return 0; 654 655 out: 656 return err; 657 } 658 659 int ntfs_get_block(struct inode *inode, sector_t vbn, 660 struct buffer_head *bh_result, int create) 661 { 662 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 663 bh_result, create, GET_BLOCK_GENERAL); 664 } 665 666 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 667 struct buffer_head *bh_result, int create) 668 { 669 return ntfs_get_block_vbo(inode, 670 (u64)vsn << inode->i_sb->s_blocksize_bits, 671 bh_result, create, GET_BLOCK_BMAP); 672 } 673 674 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 675 { 676 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 677 } 678 679 static int ntfs_readpage(struct file *file, struct page *page) 680 { 681 int err; 682 struct address_space *mapping = page->mapping; 683 struct inode *inode = mapping->host; 684 struct ntfs_inode *ni = ntfs_i(inode); 685 686 if (is_resident(ni)) { 687 ni_lock(ni); 688 err = attr_data_read_resident(ni, page); 689 ni_unlock(ni); 690 if (err != E_NTFS_NONRESIDENT) { 691 unlock_page(page); 692 return err; 693 } 694 } 695 696 if (is_compressed(ni)) { 697 ni_lock(ni); 698 err = ni_readpage_cmpr(ni, page); 699 ni_unlock(ni); 700 return err; 701 } 702 703 /* Normal + sparse files. */ 704 return mpage_readpage(page, ntfs_get_block); 705 } 706 707 static void ntfs_readahead(struct readahead_control *rac) 708 { 709 struct address_space *mapping = rac->mapping; 710 struct inode *inode = mapping->host; 711 struct ntfs_inode *ni = ntfs_i(inode); 712 u64 valid; 713 loff_t pos; 714 715 if (is_resident(ni)) { 716 /* No readahead for resident. */ 717 return; 718 } 719 720 if (is_compressed(ni)) { 721 /* No readahead for compressed. */ 722 return; 723 } 724 725 valid = ni->i_valid; 726 pos = readahead_pos(rac); 727 728 if (valid < i_size_read(inode) && pos <= valid && 729 valid < pos + readahead_length(rac)) { 730 /* Range cross 'valid'. Read it page by page. */ 731 return; 732 } 733 734 mpage_readahead(rac, ntfs_get_block); 735 } 736 737 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 738 struct buffer_head *bh_result, int create) 739 { 740 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 741 bh_result, create, GET_BLOCK_DIRECT_IO_R); 742 } 743 744 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 745 struct buffer_head *bh_result, int create) 746 { 747 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 748 bh_result, create, GET_BLOCK_DIRECT_IO_W); 749 } 750 751 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 752 { 753 struct file *file = iocb->ki_filp; 754 struct address_space *mapping = file->f_mapping; 755 struct inode *inode = mapping->host; 756 struct ntfs_inode *ni = ntfs_i(inode); 757 loff_t vbo = iocb->ki_pos; 758 loff_t end; 759 int wr = iov_iter_rw(iter) & WRITE; 760 loff_t valid; 761 ssize_t ret; 762 763 if (is_resident(ni)) { 764 /* Switch to buffered write. */ 765 ret = 0; 766 goto out; 767 } 768 769 ret = blockdev_direct_IO(iocb, inode, iter, 770 wr ? ntfs_get_block_direct_IO_W 771 : ntfs_get_block_direct_IO_R); 772 773 if (ret <= 0) 774 goto out; 775 776 end = vbo + ret; 777 valid = ni->i_valid; 778 if (wr) { 779 if (end > valid && !S_ISBLK(inode->i_mode)) { 780 ni->i_valid = end; 781 mark_inode_dirty(inode); 782 } 783 } else if (vbo < valid && valid < end) { 784 /* Fix page. */ 785 iov_iter_revert(iter, end - valid); 786 iov_iter_zero(end - valid, iter); 787 } 788 789 out: 790 return ret; 791 } 792 793 int ntfs_set_size(struct inode *inode, u64 new_size) 794 { 795 struct super_block *sb = inode->i_sb; 796 struct ntfs_sb_info *sbi = sb->s_fs_info; 797 struct ntfs_inode *ni = ntfs_i(inode); 798 int err; 799 800 /* Check for maximum file size. */ 801 if (is_sparsed(ni) || is_compressed(ni)) { 802 if (new_size > sbi->maxbytes_sparse) { 803 err = -EFBIG; 804 goto out; 805 } 806 } else if (new_size > sbi->maxbytes) { 807 err = -EFBIG; 808 goto out; 809 } 810 811 ni_lock(ni); 812 down_write(&ni->file.run_lock); 813 814 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 815 &ni->i_valid, true, NULL); 816 817 up_write(&ni->file.run_lock); 818 ni_unlock(ni); 819 820 mark_inode_dirty(inode); 821 822 out: 823 return err; 824 } 825 826 static int ntfs_writepage(struct page *page, struct writeback_control *wbc) 827 { 828 struct address_space *mapping = page->mapping; 829 struct inode *inode = mapping->host; 830 struct ntfs_inode *ni = ntfs_i(inode); 831 int err; 832 833 if (is_resident(ni)) { 834 ni_lock(ni); 835 err = attr_data_write_resident(ni, page); 836 ni_unlock(ni); 837 if (err != E_NTFS_NONRESIDENT) { 838 unlock_page(page); 839 return err; 840 } 841 } 842 843 return block_write_full_page(page, ntfs_get_block, wbc); 844 } 845 846 static int ntfs_writepages(struct address_space *mapping, 847 struct writeback_control *wbc) 848 { 849 struct inode *inode = mapping->host; 850 struct ntfs_inode *ni = ntfs_i(inode); 851 /* Redirect call to 'ntfs_writepage' for resident files. */ 852 get_block_t *get_block = is_resident(ni) ? NULL : &ntfs_get_block; 853 854 return mpage_writepages(mapping, wbc, get_block); 855 } 856 857 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 858 struct buffer_head *bh_result, int create) 859 { 860 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 861 bh_result, create, GET_BLOCK_WRITE_BEGIN); 862 } 863 864 static int ntfs_write_begin(struct file *file, struct address_space *mapping, 865 loff_t pos, u32 len, u32 flags, struct page **pagep, 866 void **fsdata) 867 { 868 int err; 869 struct inode *inode = mapping->host; 870 struct ntfs_inode *ni = ntfs_i(inode); 871 872 *pagep = NULL; 873 if (is_resident(ni)) { 874 struct page *page = grab_cache_page_write_begin( 875 mapping, pos >> PAGE_SHIFT, flags); 876 877 if (!page) { 878 err = -ENOMEM; 879 goto out; 880 } 881 882 ni_lock(ni); 883 err = attr_data_read_resident(ni, page); 884 ni_unlock(ni); 885 886 if (!err) { 887 *pagep = page; 888 goto out; 889 } 890 unlock_page(page); 891 put_page(page); 892 893 if (err != E_NTFS_NONRESIDENT) 894 goto out; 895 } 896 897 err = block_write_begin(mapping, pos, len, flags, pagep, 898 ntfs_get_block_write_begin); 899 900 out: 901 return err; 902 } 903 904 /* 905 * ntfs_write_end - Address_space_operations::write_end. 906 */ 907 static int ntfs_write_end(struct file *file, struct address_space *mapping, 908 loff_t pos, u32 len, u32 copied, struct page *page, 909 void *fsdata) 910 911 { 912 struct inode *inode = mapping->host; 913 struct ntfs_inode *ni = ntfs_i(inode); 914 u64 valid = ni->i_valid; 915 bool dirty = false; 916 int err; 917 918 if (is_resident(ni)) { 919 ni_lock(ni); 920 err = attr_data_write_resident(ni, page); 921 ni_unlock(ni); 922 if (!err) { 923 dirty = true; 924 /* Clear any buffers in page. */ 925 if (page_has_buffers(page)) { 926 struct buffer_head *head, *bh; 927 928 bh = head = page_buffers(page); 929 do { 930 clear_buffer_dirty(bh); 931 clear_buffer_mapped(bh); 932 set_buffer_uptodate(bh); 933 } while (head != (bh = bh->b_this_page)); 934 } 935 SetPageUptodate(page); 936 err = copied; 937 } 938 unlock_page(page); 939 put_page(page); 940 } else { 941 err = generic_write_end(file, mapping, pos, len, copied, page, 942 fsdata); 943 } 944 945 if (err >= 0) { 946 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 947 inode->i_ctime = inode->i_mtime = current_time(inode); 948 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 949 dirty = true; 950 } 951 952 if (valid != ni->i_valid) { 953 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 954 dirty = true; 955 } 956 957 if (dirty) 958 mark_inode_dirty(inode); 959 } 960 961 return err; 962 } 963 964 int reset_log_file(struct inode *inode) 965 { 966 int err; 967 loff_t pos = 0; 968 u32 log_size = inode->i_size; 969 struct address_space *mapping = inode->i_mapping; 970 971 for (;;) { 972 u32 len; 973 void *kaddr; 974 struct page *page; 975 976 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 977 978 err = block_write_begin(mapping, pos, len, 0, &page, 979 ntfs_get_block_write_begin); 980 if (err) 981 goto out; 982 983 kaddr = kmap_atomic(page); 984 memset(kaddr, -1, len); 985 kunmap_atomic(kaddr); 986 flush_dcache_page(page); 987 988 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 989 if (err < 0) 990 goto out; 991 pos += len; 992 993 if (pos >= log_size) 994 break; 995 balance_dirty_pages_ratelimited(mapping); 996 } 997 out: 998 mark_inode_dirty_sync(inode); 999 1000 return err; 1001 } 1002 1003 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1004 { 1005 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1006 } 1007 1008 int ntfs_sync_inode(struct inode *inode) 1009 { 1010 return _ni_write_inode(inode, 1); 1011 } 1012 1013 /* 1014 * writeback_inode - Helper function for ntfs_flush_inodes(). 1015 * 1016 * This writes both the inode and the file data blocks, waiting 1017 * for in flight data blocks before the start of the call. It 1018 * does not wait for any io started during the call. 1019 */ 1020 static int writeback_inode(struct inode *inode) 1021 { 1022 int ret = sync_inode_metadata(inode, 0); 1023 1024 if (!ret) 1025 ret = filemap_fdatawrite(inode->i_mapping); 1026 return ret; 1027 } 1028 1029 /* 1030 * ntfs_flush_inodes 1031 * 1032 * Write data and metadata corresponding to i1 and i2. The io is 1033 * started but we do not wait for any of it to finish. 1034 * 1035 * filemap_flush() is used for the block device, so if there is a dirty 1036 * page for a block already in flight, we will not wait and start the 1037 * io over again. 1038 */ 1039 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1040 struct inode *i2) 1041 { 1042 int ret = 0; 1043 1044 if (i1) 1045 ret = writeback_inode(i1); 1046 if (!ret && i2) 1047 ret = writeback_inode(i2); 1048 if (!ret) 1049 ret = sync_blockdev_nowait(sb->s_bdev); 1050 return ret; 1051 } 1052 1053 int inode_write_data(struct inode *inode, const void *data, size_t bytes) 1054 { 1055 pgoff_t idx; 1056 1057 /* Write non resident data. */ 1058 for (idx = 0; bytes; idx++) { 1059 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1060 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1061 1062 if (IS_ERR(page)) 1063 return PTR_ERR(page); 1064 1065 lock_page(page); 1066 WARN_ON(!PageUptodate(page)); 1067 ClearPageUptodate(page); 1068 1069 memcpy(page_address(page), data, op); 1070 1071 flush_dcache_page(page); 1072 SetPageUptodate(page); 1073 unlock_page(page); 1074 1075 ntfs_unmap_page(page); 1076 1077 bytes -= op; 1078 data = Add2Ptr(data, PAGE_SIZE); 1079 } 1080 return 0; 1081 } 1082 1083 /* 1084 * ntfs_reparse_bytes 1085 * 1086 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1087 * for unicode string of @uni_len length. 1088 */ 1089 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1090 { 1091 /* Header + unicode string + decorated unicode string. */ 1092 return sizeof(short) * (2 * uni_len + 4) + 1093 offsetof(struct REPARSE_DATA_BUFFER, 1094 SymbolicLinkReparseBuffer.PathBuffer); 1095 } 1096 1097 static struct REPARSE_DATA_BUFFER * 1098 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1099 u32 size, u16 *nsize) 1100 { 1101 int i, err; 1102 struct REPARSE_DATA_BUFFER *rp; 1103 __le16 *rp_name; 1104 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1105 1106 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1107 if (!rp) 1108 return ERR_PTR(-ENOMEM); 1109 1110 rs = &rp->SymbolicLinkReparseBuffer; 1111 rp_name = rs->PathBuffer; 1112 1113 /* Convert link name to UTF-16. */ 1114 err = ntfs_nls_to_utf16(sbi, symname, size, 1115 (struct cpu_str *)(rp_name - 1), 2 * size, 1116 UTF16_LITTLE_ENDIAN); 1117 if (err < 0) 1118 goto out; 1119 1120 /* err = the length of unicode name of symlink. */ 1121 *nsize = ntfs_reparse_bytes(err); 1122 1123 if (*nsize > sbi->reparse.max_size) { 1124 err = -EFBIG; 1125 goto out; 1126 } 1127 1128 /* Translate Linux '/' into Windows '\'. */ 1129 for (i = 0; i < err; i++) { 1130 if (rp_name[i] == cpu_to_le16('/')) 1131 rp_name[i] = cpu_to_le16('\\'); 1132 } 1133 1134 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1135 rp->ReparseDataLength = 1136 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1137 SymbolicLinkReparseBuffer)); 1138 1139 /* PrintName + SubstituteName. */ 1140 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1141 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1142 rs->PrintNameLength = rs->SubstituteNameOffset; 1143 1144 /* 1145 * TODO: Use relative path if possible to allow Windows to 1146 * parse this path. 1147 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1148 */ 1149 rs->Flags = 0; 1150 1151 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1152 1153 /* Decorate SubstituteName. */ 1154 rp_name += err; 1155 rp_name[0] = cpu_to_le16('\\'); 1156 rp_name[1] = cpu_to_le16('?'); 1157 rp_name[2] = cpu_to_le16('?'); 1158 rp_name[3] = cpu_to_le16('\\'); 1159 1160 return rp; 1161 out: 1162 kfree(rp); 1163 return ERR_PTR(err); 1164 } 1165 1166 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns, 1167 struct inode *dir, struct dentry *dentry, 1168 const struct cpu_str *uni, umode_t mode, 1169 dev_t dev, const char *symname, u32 size, 1170 struct ntfs_fnd *fnd) 1171 { 1172 int err; 1173 struct super_block *sb = dir->i_sb; 1174 struct ntfs_sb_info *sbi = sb->s_fs_info; 1175 const struct qstr *name = &dentry->d_name; 1176 CLST ino = 0; 1177 struct ntfs_inode *dir_ni = ntfs_i(dir); 1178 struct ntfs_inode *ni = NULL; 1179 struct inode *inode = NULL; 1180 struct ATTRIB *attr; 1181 struct ATTR_STD_INFO5 *std5; 1182 struct ATTR_FILE_NAME *fname; 1183 struct MFT_REC *rec; 1184 u32 asize, dsize, sd_size; 1185 enum FILE_ATTRIBUTE fa; 1186 __le32 security_id = SECURITY_ID_INVALID; 1187 CLST vcn; 1188 const void *sd; 1189 u16 t16, nsize = 0, aid = 0; 1190 struct INDEX_ROOT *root, *dir_root; 1191 struct NTFS_DE *e, *new_de = NULL; 1192 struct REPARSE_DATA_BUFFER *rp = NULL; 1193 bool rp_inserted = false; 1194 1195 ni_lock_dir(dir_ni); 1196 1197 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1198 if (!dir_root) { 1199 err = -EINVAL; 1200 goto out1; 1201 } 1202 1203 if (S_ISDIR(mode)) { 1204 /* Use parent's directory attributes. */ 1205 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1206 FILE_ATTRIBUTE_ARCHIVE; 1207 /* 1208 * By default child directory inherits parent attributes. 1209 * Root directory is hidden + system. 1210 * Make an exception for children in root. 1211 */ 1212 if (dir->i_ino == MFT_REC_ROOT) 1213 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1214 } else if (S_ISLNK(mode)) { 1215 /* It is good idea that link should be the same type (file/dir) as target */ 1216 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1217 1218 /* 1219 * Linux: there are dir/file/symlink and so on. 1220 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1221 * It is good idea to create: 1222 * dir + reparse if 'symname' points to directory 1223 * or 1224 * file + reparse if 'symname' points to file 1225 * Unfortunately kern_path hangs if symname contains 'dir'. 1226 */ 1227 1228 /* 1229 * struct path path; 1230 * 1231 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1232 * struct inode *target = d_inode(path.dentry); 1233 * 1234 * if (S_ISDIR(target->i_mode)) 1235 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1236 * // if ( target->i_sb == sb ){ 1237 * // use relative path? 1238 * // } 1239 * path_put(&path); 1240 * } 1241 */ 1242 } else if (S_ISREG(mode)) { 1243 if (sbi->options->sparse) { 1244 /* Sparsed regular file, cause option 'sparse'. */ 1245 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1246 FILE_ATTRIBUTE_ARCHIVE; 1247 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1248 /* Compressed regular file, if parent is compressed. */ 1249 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1250 } else { 1251 /* Regular file, default attributes. */ 1252 fa = FILE_ATTRIBUTE_ARCHIVE; 1253 } 1254 } else { 1255 fa = FILE_ATTRIBUTE_ARCHIVE; 1256 } 1257 1258 if (!(mode & 0222)) 1259 fa |= FILE_ATTRIBUTE_READONLY; 1260 1261 /* Allocate PATH_MAX bytes. */ 1262 new_de = __getname(); 1263 if (!new_de) { 1264 err = -ENOMEM; 1265 goto out1; 1266 } 1267 1268 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1269 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1270 1271 /* Step 1: allocate and fill new mft record. */ 1272 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1273 if (err) 1274 goto out2; 1275 1276 ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY); 1277 if (IS_ERR(ni)) { 1278 err = PTR_ERR(ni); 1279 ni = NULL; 1280 goto out3; 1281 } 1282 inode = &ni->vfs_inode; 1283 inode_init_owner(mnt_userns, inode, dir, mode); 1284 mode = inode->i_mode; 1285 1286 inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime = 1287 current_time(inode); 1288 1289 rec = ni->mi.mrec; 1290 rec->hard_links = cpu_to_le16(1); 1291 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1292 1293 /* Get default security id. */ 1294 sd = s_default_security; 1295 sd_size = sizeof(s_default_security); 1296 1297 if (is_ntfs3(sbi)) { 1298 security_id = dir_ni->std_security_id; 1299 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1300 security_id = sbi->security.def_security_id; 1301 1302 if (security_id == SECURITY_ID_INVALID && 1303 !ntfs_insert_security(sbi, sd, sd_size, 1304 &security_id, NULL)) 1305 sbi->security.def_security_id = security_id; 1306 } 1307 } 1308 1309 /* Insert standard info. */ 1310 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1311 1312 if (security_id == SECURITY_ID_INVALID) { 1313 dsize = sizeof(struct ATTR_STD_INFO); 1314 } else { 1315 dsize = sizeof(struct ATTR_STD_INFO5); 1316 std5->security_id = security_id; 1317 ni->std_security_id = security_id; 1318 } 1319 asize = SIZEOF_RESIDENT + dsize; 1320 1321 attr->type = ATTR_STD; 1322 attr->size = cpu_to_le32(asize); 1323 attr->id = cpu_to_le16(aid++); 1324 attr->res.data_off = SIZEOF_RESIDENT_LE; 1325 attr->res.data_size = cpu_to_le32(dsize); 1326 1327 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1328 kernel2nt(&inode->i_atime); 1329 1330 ni->std_fa = fa; 1331 std5->fa = fa; 1332 1333 attr = Add2Ptr(attr, asize); 1334 1335 /* Insert file name. */ 1336 err = fill_name_de(sbi, new_de, name, uni); 1337 if (err) 1338 goto out4; 1339 1340 mi_get_ref(&ni->mi, &new_de->ref); 1341 1342 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1343 mi_get_ref(&dir_ni->mi, &fname->home); 1344 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1345 fname->dup.a_time = std5->cr_time; 1346 fname->dup.alloc_size = fname->dup.data_size = 0; 1347 fname->dup.fa = std5->fa; 1348 fname->dup.ea_size = fname->dup.reparse = 0; 1349 1350 dsize = le16_to_cpu(new_de->key_size); 1351 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1352 1353 attr->type = ATTR_NAME; 1354 attr->size = cpu_to_le32(asize); 1355 attr->res.data_off = SIZEOF_RESIDENT_LE; 1356 attr->res.flags = RESIDENT_FLAG_INDEXED; 1357 attr->id = cpu_to_le16(aid++); 1358 attr->res.data_size = cpu_to_le32(dsize); 1359 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1360 1361 attr = Add2Ptr(attr, asize); 1362 1363 if (security_id == SECURITY_ID_INVALID) { 1364 /* Insert security attribute. */ 1365 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1366 1367 attr->type = ATTR_SECURE; 1368 attr->size = cpu_to_le32(asize); 1369 attr->id = cpu_to_le16(aid++); 1370 attr->res.data_off = SIZEOF_RESIDENT_LE; 1371 attr->res.data_size = cpu_to_le32(sd_size); 1372 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1373 1374 attr = Add2Ptr(attr, asize); 1375 } 1376 1377 attr->id = cpu_to_le16(aid++); 1378 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1379 /* 1380 * Regular directory or symlink to directory. 1381 * Create root attribute. 1382 */ 1383 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1384 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1385 1386 attr->type = ATTR_ROOT; 1387 attr->size = cpu_to_le32(asize); 1388 1389 attr->name_len = ARRAY_SIZE(I30_NAME); 1390 attr->name_off = SIZEOF_RESIDENT_LE; 1391 attr->res.data_off = 1392 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1393 attr->res.data_size = cpu_to_le32(dsize); 1394 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1395 sizeof(I30_NAME)); 1396 1397 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1398 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1399 root->ihdr.de_off = 1400 cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10 1401 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1402 sizeof(struct NTFS_DE)); 1403 root->ihdr.total = root->ihdr.used; 1404 1405 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1406 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1407 e->flags = NTFS_IE_LAST; 1408 } else if (S_ISLNK(mode)) { 1409 /* 1410 * Symlink to file. 1411 * Create empty resident data attribute. 1412 */ 1413 asize = SIZEOF_RESIDENT; 1414 1415 /* Insert empty ATTR_DATA */ 1416 attr->type = ATTR_DATA; 1417 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1418 attr->name_off = SIZEOF_RESIDENT_LE; 1419 attr->res.data_off = SIZEOF_RESIDENT_LE; 1420 } else if (S_ISREG(mode)) { 1421 /* 1422 * Regular file. Create empty non resident data attribute. 1423 */ 1424 attr->type = ATTR_DATA; 1425 attr->non_res = 1; 1426 attr->nres.evcn = cpu_to_le64(-1ll); 1427 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1428 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1429 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1430 attr->flags = ATTR_FLAG_SPARSED; 1431 asize = SIZEOF_NONRESIDENT_EX + 8; 1432 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1433 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1434 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1435 attr->flags = ATTR_FLAG_COMPRESSED; 1436 attr->nres.c_unit = COMPRESSION_UNIT; 1437 asize = SIZEOF_NONRESIDENT_EX + 8; 1438 } else { 1439 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1440 attr->name_off = SIZEOF_NONRESIDENT_LE; 1441 asize = SIZEOF_NONRESIDENT + 8; 1442 } 1443 attr->nres.run_off = attr->name_off; 1444 } else { 1445 /* 1446 * Node. Create empty resident data attribute. 1447 */ 1448 attr->type = ATTR_DATA; 1449 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1450 attr->name_off = SIZEOF_RESIDENT_LE; 1451 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1452 attr->flags = ATTR_FLAG_SPARSED; 1453 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1454 attr->flags = ATTR_FLAG_COMPRESSED; 1455 attr->res.data_off = SIZEOF_RESIDENT_LE; 1456 asize = SIZEOF_RESIDENT; 1457 ni->ni_flags |= NI_FLAG_RESIDENT; 1458 } 1459 1460 if (S_ISDIR(mode)) { 1461 ni->ni_flags |= NI_FLAG_DIR; 1462 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1463 if (err) 1464 goto out4; 1465 } else if (S_ISLNK(mode)) { 1466 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1467 1468 if (IS_ERR(rp)) { 1469 err = PTR_ERR(rp); 1470 rp = NULL; 1471 goto out4; 1472 } 1473 1474 /* 1475 * Insert ATTR_REPARSE. 1476 */ 1477 attr = Add2Ptr(attr, asize); 1478 attr->type = ATTR_REPARSE; 1479 attr->id = cpu_to_le16(aid++); 1480 1481 /* Resident or non resident? */ 1482 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1483 t16 = PtrOffset(rec, attr); 1484 1485 /* 1486 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1487 * It is good idea to keep extened attributes resident. 1488 */ 1489 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1490 CLST alen; 1491 CLST clst = bytes_to_cluster(sbi, nsize); 1492 1493 /* Bytes per runs. */ 1494 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1495 1496 attr->non_res = 1; 1497 attr->nres.evcn = cpu_to_le64(clst - 1); 1498 attr->name_off = SIZEOF_NONRESIDENT_LE; 1499 attr->nres.run_off = attr->name_off; 1500 attr->nres.data_size = cpu_to_le64(nsize); 1501 attr->nres.valid_size = attr->nres.data_size; 1502 attr->nres.alloc_size = 1503 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1504 1505 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1506 clst, NULL, 0, &alen, 0, 1507 NULL); 1508 if (err) 1509 goto out5; 1510 1511 err = run_pack(&ni->file.run, 0, clst, 1512 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1513 &vcn); 1514 if (err < 0) 1515 goto out5; 1516 1517 if (vcn != clst) { 1518 err = -EINVAL; 1519 goto out5; 1520 } 1521 1522 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1523 } else { 1524 attr->res.data_off = SIZEOF_RESIDENT_LE; 1525 attr->res.data_size = cpu_to_le32(nsize); 1526 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1527 nsize = 0; 1528 } 1529 /* Size of symlink equals the length of input string. */ 1530 inode->i_size = size; 1531 1532 attr->size = cpu_to_le32(asize); 1533 1534 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1535 &new_de->ref); 1536 if (err) 1537 goto out5; 1538 1539 rp_inserted = true; 1540 } 1541 1542 attr = Add2Ptr(attr, asize); 1543 attr->type = ATTR_END; 1544 1545 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1546 rec->next_attr_id = cpu_to_le16(aid); 1547 1548 /* Step 2: Add new name in index. */ 1549 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1550 if (err) 1551 goto out6; 1552 1553 /* Unlock parent directory before ntfs_init_acl. */ 1554 ni_unlock(dir_ni); 1555 1556 inode->i_generation = le16_to_cpu(rec->seq); 1557 1558 dir->i_mtime = dir->i_ctime = inode->i_atime; 1559 1560 if (S_ISDIR(mode)) { 1561 inode->i_op = &ntfs_dir_inode_operations; 1562 inode->i_fop = &ntfs_dir_operations; 1563 } else if (S_ISLNK(mode)) { 1564 inode->i_op = &ntfs_link_inode_operations; 1565 inode->i_fop = NULL; 1566 inode->i_mapping->a_ops = &ntfs_aops; 1567 inode->i_size = size; 1568 inode_nohighmem(inode); 1569 } else if (S_ISREG(mode)) { 1570 inode->i_op = &ntfs_file_inode_operations; 1571 inode->i_fop = &ntfs_file_operations; 1572 inode->i_mapping->a_ops = 1573 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops; 1574 init_rwsem(&ni->file.run_lock); 1575 } else { 1576 inode->i_op = &ntfs_special_inode_operations; 1577 init_special_inode(inode, mode, dev); 1578 } 1579 1580 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1581 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1582 err = ntfs_init_acl(mnt_userns, inode, dir); 1583 if (err) 1584 goto out7; 1585 } else 1586 #endif 1587 { 1588 inode->i_flags |= S_NOSEC; 1589 } 1590 1591 /* Write non resident data. */ 1592 if (nsize) { 1593 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0); 1594 if (err) 1595 goto out7; 1596 } 1597 1598 /* 1599 * Call 'd_instantiate' after inode->i_op is set 1600 * but before finish_open. 1601 */ 1602 d_instantiate(dentry, inode); 1603 1604 ntfs_save_wsl_perm(inode); 1605 mark_inode_dirty(dir); 1606 mark_inode_dirty(inode); 1607 1608 /* Normal exit. */ 1609 goto out2; 1610 1611 out7: 1612 1613 /* Undo 'indx_insert_entry'. */ 1614 ni_lock_dir(dir_ni); 1615 indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1, 1616 le16_to_cpu(new_de->key_size), sbi); 1617 /* ni_unlock(dir_ni); will be called later. */ 1618 out6: 1619 if (rp_inserted) 1620 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1621 1622 out5: 1623 if (S_ISDIR(mode) || run_is_empty(&ni->file.run)) 1624 goto out4; 1625 1626 run_deallocate(sbi, &ni->file.run, false); 1627 1628 out4: 1629 clear_rec_inuse(rec); 1630 clear_nlink(inode); 1631 ni->mi.dirty = false; 1632 discard_new_inode(inode); 1633 out3: 1634 ntfs_mark_rec_free(sbi, ino); 1635 1636 out2: 1637 __putname(new_de); 1638 kfree(rp); 1639 1640 out1: 1641 if (err) { 1642 ni_unlock(dir_ni); 1643 return ERR_PTR(err); 1644 } 1645 1646 unlock_new_inode(inode); 1647 1648 return inode; 1649 } 1650 1651 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1652 { 1653 int err; 1654 struct ntfs_inode *ni = ntfs_i(inode); 1655 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1656 struct NTFS_DE *de; 1657 struct ATTR_FILE_NAME *de_name; 1658 1659 /* Allocate PATH_MAX bytes. */ 1660 de = __getname(); 1661 if (!de) 1662 return -ENOMEM; 1663 1664 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1665 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1666 1667 /* Construct 'de'. */ 1668 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1669 if (err) 1670 goto out; 1671 1672 de_name = (struct ATTR_FILE_NAME *)(de + 1); 1673 /* Fill duplicate info. */ 1674 de_name->dup.cr_time = de_name->dup.m_time = de_name->dup.c_time = 1675 de_name->dup.a_time = kernel2nt(&inode->i_ctime); 1676 de_name->dup.alloc_size = de_name->dup.data_size = 1677 cpu_to_le64(inode->i_size); 1678 de_name->dup.fa = ni->std_fa; 1679 de_name->dup.ea_size = de_name->dup.reparse = 0; 1680 1681 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1682 out: 1683 __putname(de); 1684 return err; 1685 } 1686 1687 /* 1688 * ntfs_unlink_inode 1689 * 1690 * inode_operations::unlink 1691 * inode_operations::rmdir 1692 */ 1693 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1694 { 1695 int err; 1696 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1697 struct inode *inode = d_inode(dentry); 1698 struct ntfs_inode *ni = ntfs_i(inode); 1699 struct ntfs_inode *dir_ni = ntfs_i(dir); 1700 struct NTFS_DE *de, *de2 = NULL; 1701 int undo_remove; 1702 1703 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1704 return -EINVAL; 1705 1706 /* Allocate PATH_MAX bytes. */ 1707 de = __getname(); 1708 if (!de) 1709 return -ENOMEM; 1710 1711 ni_lock(ni); 1712 1713 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1714 err = -ENOTEMPTY; 1715 goto out; 1716 } 1717 1718 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1719 if (err < 0) 1720 goto out; 1721 1722 undo_remove = 0; 1723 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1724 1725 if (!err) { 1726 drop_nlink(inode); 1727 dir->i_mtime = dir->i_ctime = current_time(dir); 1728 mark_inode_dirty(dir); 1729 inode->i_ctime = dir->i_ctime; 1730 if (inode->i_nlink) 1731 mark_inode_dirty(inode); 1732 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1733 make_bad_inode(inode); 1734 ntfs_inode_err(inode, "failed to undo unlink"); 1735 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 1736 } else { 1737 if (ni_is_dirty(dir)) 1738 mark_inode_dirty(dir); 1739 if (ni_is_dirty(inode)) 1740 mark_inode_dirty(inode); 1741 } 1742 1743 out: 1744 ni_unlock(ni); 1745 __putname(de); 1746 return err; 1747 } 1748 1749 void ntfs_evict_inode(struct inode *inode) 1750 { 1751 truncate_inode_pages_final(&inode->i_data); 1752 1753 if (inode->i_nlink) 1754 _ni_write_inode(inode, inode_needs_sync(inode)); 1755 1756 invalidate_inode_buffers(inode); 1757 clear_inode(inode); 1758 1759 ni_clear(ntfs_i(inode)); 1760 } 1761 1762 static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer, 1763 int buflen) 1764 { 1765 int i, err = -EINVAL; 1766 struct ntfs_inode *ni = ntfs_i(inode); 1767 struct super_block *sb = inode->i_sb; 1768 struct ntfs_sb_info *sbi = sb->s_fs_info; 1769 u64 size; 1770 u16 ulen = 0; 1771 void *to_free = NULL; 1772 struct REPARSE_DATA_BUFFER *rp; 1773 const __le16 *uname; 1774 struct ATTRIB *attr; 1775 1776 /* Reparse data present. Try to parse it. */ 1777 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1778 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1779 1780 *buffer = 0; 1781 1782 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1783 if (!attr) 1784 goto out; 1785 1786 if (!attr->non_res) { 1787 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1788 if (!rp) 1789 goto out; 1790 size = le32_to_cpu(attr->res.data_size); 1791 } else { 1792 size = le64_to_cpu(attr->nres.data_size); 1793 rp = NULL; 1794 } 1795 1796 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1797 goto out; 1798 1799 if (!rp) { 1800 rp = kmalloc(size, GFP_NOFS); 1801 if (!rp) { 1802 err = -ENOMEM; 1803 goto out; 1804 } 1805 to_free = rp; 1806 /* Read into temporal buffer. */ 1807 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1808 if (err) 1809 goto out; 1810 } 1811 1812 /* Microsoft Tag. */ 1813 switch (rp->ReparseTag) { 1814 case IO_REPARSE_TAG_MOUNT_POINT: 1815 /* Mount points and junctions. */ 1816 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1817 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1818 MountPointReparseBuffer.PathBuffer)) 1819 goto out; 1820 uname = Add2Ptr(rp, 1821 offsetof(struct REPARSE_DATA_BUFFER, 1822 MountPointReparseBuffer.PathBuffer) + 1823 le16_to_cpu(rp->MountPointReparseBuffer 1824 .PrintNameOffset)); 1825 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1826 break; 1827 1828 case IO_REPARSE_TAG_SYMLINK: 1829 /* FolderSymbolicLink */ 1830 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1831 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1832 SymbolicLinkReparseBuffer.PathBuffer)) 1833 goto out; 1834 uname = Add2Ptr( 1835 rp, offsetof(struct REPARSE_DATA_BUFFER, 1836 SymbolicLinkReparseBuffer.PathBuffer) + 1837 le16_to_cpu(rp->SymbolicLinkReparseBuffer 1838 .PrintNameOffset)); 1839 ulen = le16_to_cpu( 1840 rp->SymbolicLinkReparseBuffer.PrintNameLength); 1841 break; 1842 1843 case IO_REPARSE_TAG_CLOUD: 1844 case IO_REPARSE_TAG_CLOUD_1: 1845 case IO_REPARSE_TAG_CLOUD_2: 1846 case IO_REPARSE_TAG_CLOUD_3: 1847 case IO_REPARSE_TAG_CLOUD_4: 1848 case IO_REPARSE_TAG_CLOUD_5: 1849 case IO_REPARSE_TAG_CLOUD_6: 1850 case IO_REPARSE_TAG_CLOUD_7: 1851 case IO_REPARSE_TAG_CLOUD_8: 1852 case IO_REPARSE_TAG_CLOUD_9: 1853 case IO_REPARSE_TAG_CLOUD_A: 1854 case IO_REPARSE_TAG_CLOUD_B: 1855 case IO_REPARSE_TAG_CLOUD_C: 1856 case IO_REPARSE_TAG_CLOUD_D: 1857 case IO_REPARSE_TAG_CLOUD_E: 1858 case IO_REPARSE_TAG_CLOUD_F: 1859 err = sizeof("OneDrive") - 1; 1860 if (err > buflen) 1861 err = buflen; 1862 memcpy(buffer, "OneDrive", err); 1863 goto out; 1864 1865 default: 1866 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 1867 /* Unknown Microsoft Tag. */ 1868 goto out; 1869 } 1870 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 1871 size <= sizeof(struct REPARSE_POINT)) { 1872 goto out; 1873 } 1874 1875 /* Users tag. */ 1876 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 1877 ulen = le16_to_cpu(rp->ReparseDataLength) - 1878 sizeof(struct REPARSE_POINT); 1879 } 1880 1881 /* Convert nlen from bytes to UNICODE chars. */ 1882 ulen >>= 1; 1883 1884 /* Check that name is available. */ 1885 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 1886 goto out; 1887 1888 /* If name is already zero terminated then truncate it now. */ 1889 if (!uname[ulen - 1]) 1890 ulen -= 1; 1891 1892 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 1893 1894 if (err < 0) 1895 goto out; 1896 1897 /* Translate Windows '\' into Linux '/'. */ 1898 for (i = 0; i < err; i++) { 1899 if (buffer[i] == '\\') 1900 buffer[i] = '/'; 1901 } 1902 1903 /* Always set last zero. */ 1904 buffer[err] = 0; 1905 out: 1906 kfree(to_free); 1907 return err; 1908 } 1909 1910 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 1911 struct delayed_call *done) 1912 { 1913 int err; 1914 char *ret; 1915 1916 if (!de) 1917 return ERR_PTR(-ECHILD); 1918 1919 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 1920 if (!ret) 1921 return ERR_PTR(-ENOMEM); 1922 1923 err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE); 1924 if (err < 0) { 1925 kfree(ret); 1926 return ERR_PTR(err); 1927 } 1928 1929 set_delayed_call(done, kfree_link, ret); 1930 1931 return ret; 1932 } 1933 1934 // clang-format off 1935 const struct inode_operations ntfs_link_inode_operations = { 1936 .get_link = ntfs_get_link, 1937 .setattr = ntfs3_setattr, 1938 .listxattr = ntfs_listxattr, 1939 .permission = ntfs_permission, 1940 .get_acl = ntfs_get_acl, 1941 .set_acl = ntfs_set_acl, 1942 }; 1943 1944 const struct address_space_operations ntfs_aops = { 1945 .readpage = ntfs_readpage, 1946 .readahead = ntfs_readahead, 1947 .writepage = ntfs_writepage, 1948 .writepages = ntfs_writepages, 1949 .write_begin = ntfs_write_begin, 1950 .write_end = ntfs_write_end, 1951 .direct_IO = ntfs_direct_IO, 1952 .bmap = ntfs_bmap, 1953 .set_page_dirty = __set_page_dirty_buffers, 1954 }; 1955 1956 const struct address_space_operations ntfs_aops_cmpr = { 1957 .readpage = ntfs_readpage, 1958 .readahead = ntfs_readahead, 1959 }; 1960 // clang-format on 1961