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 inode->i_op = &ntfs_file_inode_operations; 434 } else { 435 err = -EINVAL; 436 goto out; 437 } 438 439 if ((sbi->options->sys_immutable && 440 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 441 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 442 inode->i_flags |= S_IMMUTABLE; 443 } else { 444 inode->i_flags &= ~S_IMMUTABLE; 445 } 446 447 inode->i_mode = mode; 448 if (!(ni->ni_flags & NI_FLAG_EA)) { 449 /* If no xattr then no security (stored in xattr). */ 450 inode->i_flags |= S_NOSEC; 451 } 452 453 Ok: 454 if (ino == MFT_REC_MFT && !sb->s_root) 455 sbi->mft.ni = NULL; 456 457 unlock_new_inode(inode); 458 459 return inode; 460 461 out: 462 if (ino == MFT_REC_MFT && !sb->s_root) 463 sbi->mft.ni = NULL; 464 465 iget_failed(inode); 466 return ERR_PTR(err); 467 } 468 469 /* 470 * ntfs_test_inode 471 * 472 * Return: 1 if match. 473 */ 474 static int ntfs_test_inode(struct inode *inode, void *data) 475 { 476 struct MFT_REF *ref = data; 477 478 return ino_get(ref) == inode->i_ino; 479 } 480 481 static int ntfs_set_inode(struct inode *inode, void *data) 482 { 483 const struct MFT_REF *ref = data; 484 485 inode->i_ino = ino_get(ref); 486 return 0; 487 } 488 489 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 490 const struct cpu_str *name) 491 { 492 struct inode *inode; 493 494 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 495 (void *)ref); 496 if (unlikely(!inode)) 497 return ERR_PTR(-ENOMEM); 498 499 /* If this is a freshly allocated inode, need to read it now. */ 500 if (inode->i_state & I_NEW) 501 inode = ntfs_read_mft(inode, name, ref); 502 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 503 /* Inode overlaps? */ 504 _ntfs_bad_inode(inode); 505 } 506 507 return inode; 508 } 509 510 enum get_block_ctx { 511 GET_BLOCK_GENERAL = 0, 512 GET_BLOCK_WRITE_BEGIN = 1, 513 GET_BLOCK_DIRECT_IO_R = 2, 514 GET_BLOCK_DIRECT_IO_W = 3, 515 GET_BLOCK_BMAP = 4, 516 }; 517 518 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 519 struct buffer_head *bh, int create, 520 enum get_block_ctx ctx) 521 { 522 struct super_block *sb = inode->i_sb; 523 struct ntfs_sb_info *sbi = sb->s_fs_info; 524 struct ntfs_inode *ni = ntfs_i(inode); 525 struct page *page = bh->b_page; 526 u8 cluster_bits = sbi->cluster_bits; 527 u32 block_size = sb->s_blocksize; 528 u64 bytes, lbo, valid; 529 u32 off; 530 int err; 531 CLST vcn, lcn, len; 532 bool new; 533 534 /* Clear previous state. */ 535 clear_buffer_new(bh); 536 clear_buffer_uptodate(bh); 537 538 /* Direct write uses 'create=0'. */ 539 if (!create && vbo >= ni->i_valid) { 540 /* Out of valid. */ 541 return 0; 542 } 543 544 if (vbo >= inode->i_size) { 545 /* Out of size. */ 546 return 0; 547 } 548 549 if (is_resident(ni)) { 550 ni_lock(ni); 551 err = attr_data_read_resident(ni, page); 552 ni_unlock(ni); 553 554 if (!err) 555 set_buffer_uptodate(bh); 556 bh->b_size = block_size; 557 return err; 558 } 559 560 vcn = vbo >> cluster_bits; 561 off = vbo & sbi->cluster_mask; 562 new = false; 563 564 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL); 565 if (err) 566 goto out; 567 568 if (!len) 569 return 0; 570 571 bytes = ((u64)len << cluster_bits) - off; 572 573 if (lcn == SPARSE_LCN) { 574 if (!create) { 575 if (bh->b_size > bytes) 576 bh->b_size = bytes; 577 return 0; 578 } 579 WARN_ON(1); 580 } 581 582 if (new) { 583 set_buffer_new(bh); 584 if ((len << cluster_bits) > block_size) 585 ntfs_sparse_cluster(inode, page, vcn, len); 586 } 587 588 lbo = ((u64)lcn << cluster_bits) + off; 589 590 set_buffer_mapped(bh); 591 bh->b_bdev = sb->s_bdev; 592 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 593 594 valid = ni->i_valid; 595 596 if (ctx == GET_BLOCK_DIRECT_IO_W) { 597 /* ntfs_direct_IO will update ni->i_valid. */ 598 if (vbo >= valid) 599 set_buffer_new(bh); 600 } else if (create) { 601 /* Normal write. */ 602 if (bytes > bh->b_size) 603 bytes = bh->b_size; 604 605 if (vbo >= valid) 606 set_buffer_new(bh); 607 608 if (vbo + bytes > valid) { 609 ni->i_valid = vbo + bytes; 610 mark_inode_dirty(inode); 611 } 612 } else if (vbo >= valid) { 613 /* Read out of valid data. */ 614 /* Should never be here 'cause already checked. */ 615 clear_buffer_mapped(bh); 616 } else if (vbo + bytes <= valid) { 617 /* Normal read. */ 618 } else if (vbo + block_size <= valid) { 619 /* Normal short read. */ 620 bytes = block_size; 621 } else { 622 /* 623 * Read across valid size: vbo < valid && valid < vbo + block_size 624 */ 625 bytes = block_size; 626 627 if (page) { 628 u32 voff = valid - vbo; 629 630 bh->b_size = block_size; 631 off = vbo & (PAGE_SIZE - 1); 632 set_bh_page(bh, page, off); 633 err = bh_read(bh, 0); 634 if (err < 0) 635 goto out; 636 zero_user_segment(page, off + voff, off + block_size); 637 } 638 } 639 640 if (bh->b_size > bytes) 641 bh->b_size = bytes; 642 643 #ifndef __LP64__ 644 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 645 static_assert(sizeof(size_t) < sizeof(loff_t)); 646 if (bytes > 0x40000000u) 647 bh->b_size = 0x40000000u; 648 } 649 #endif 650 651 return 0; 652 653 out: 654 return err; 655 } 656 657 int ntfs_get_block(struct inode *inode, sector_t vbn, 658 struct buffer_head *bh_result, int create) 659 { 660 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 661 bh_result, create, GET_BLOCK_GENERAL); 662 } 663 664 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 665 struct buffer_head *bh_result, int create) 666 { 667 return ntfs_get_block_vbo(inode, 668 (u64)vsn << inode->i_sb->s_blocksize_bits, 669 bh_result, create, GET_BLOCK_BMAP); 670 } 671 672 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 673 { 674 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 675 } 676 677 static int ntfs_read_folio(struct file *file, struct folio *folio) 678 { 679 struct page *page = &folio->page; 680 int err; 681 struct address_space *mapping = page->mapping; 682 struct inode *inode = mapping->host; 683 struct ntfs_inode *ni = ntfs_i(inode); 684 685 if (is_resident(ni)) { 686 ni_lock(ni); 687 err = attr_data_read_resident(ni, page); 688 ni_unlock(ni); 689 if (err != E_NTFS_NONRESIDENT) { 690 unlock_page(page); 691 return err; 692 } 693 } 694 695 if (is_compressed(ni)) { 696 ni_lock(ni); 697 err = ni_readpage_cmpr(ni, page); 698 ni_unlock(ni); 699 return err; 700 } 701 702 /* Normal + sparse files. */ 703 return mpage_read_folio(folio, ntfs_get_block); 704 } 705 706 static void ntfs_readahead(struct readahead_control *rac) 707 { 708 struct address_space *mapping = rac->mapping; 709 struct inode *inode = mapping->host; 710 struct ntfs_inode *ni = ntfs_i(inode); 711 u64 valid; 712 loff_t pos; 713 714 if (is_resident(ni)) { 715 /* No readahead for resident. */ 716 return; 717 } 718 719 if (is_compressed(ni)) { 720 /* No readahead for compressed. */ 721 return; 722 } 723 724 valid = ni->i_valid; 725 pos = readahead_pos(rac); 726 727 if (valid < i_size_read(inode) && pos <= valid && 728 valid < pos + readahead_length(rac)) { 729 /* Range cross 'valid'. Read it page by page. */ 730 return; 731 } 732 733 mpage_readahead(rac, ntfs_get_block); 734 } 735 736 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 737 struct buffer_head *bh_result, int create) 738 { 739 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 740 bh_result, create, GET_BLOCK_DIRECT_IO_R); 741 } 742 743 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 744 struct buffer_head *bh_result, int create) 745 { 746 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 747 bh_result, create, GET_BLOCK_DIRECT_IO_W); 748 } 749 750 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 751 { 752 struct file *file = iocb->ki_filp; 753 struct address_space *mapping = file->f_mapping; 754 struct inode *inode = mapping->host; 755 struct ntfs_inode *ni = ntfs_i(inode); 756 loff_t vbo = iocb->ki_pos; 757 loff_t end; 758 int wr = iov_iter_rw(iter) & WRITE; 759 size_t iter_count = iov_iter_count(iter); 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 end = vbo + ret; 775 else if (wr && ret == -EIOCBQUEUED) 776 end = vbo + iter_count; 777 else 778 goto out; 779 780 valid = ni->i_valid; 781 if (wr) { 782 if (end > valid && !S_ISBLK(inode->i_mode)) { 783 ni->i_valid = end; 784 mark_inode_dirty(inode); 785 } 786 } else if (vbo < valid && valid < end) { 787 /* Fix page. */ 788 iov_iter_revert(iter, end - valid); 789 iov_iter_zero(end - valid, iter); 790 } 791 792 out: 793 return ret; 794 } 795 796 int ntfs_set_size(struct inode *inode, u64 new_size) 797 { 798 struct super_block *sb = inode->i_sb; 799 struct ntfs_sb_info *sbi = sb->s_fs_info; 800 struct ntfs_inode *ni = ntfs_i(inode); 801 int err; 802 803 /* Check for maximum file size. */ 804 if (is_sparsed(ni) || is_compressed(ni)) { 805 if (new_size > sbi->maxbytes_sparse) { 806 err = -EFBIG; 807 goto out; 808 } 809 } else if (new_size > sbi->maxbytes) { 810 err = -EFBIG; 811 goto out; 812 } 813 814 ni_lock(ni); 815 down_write(&ni->file.run_lock); 816 817 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 818 &ni->i_valid, true, NULL); 819 820 up_write(&ni->file.run_lock); 821 ni_unlock(ni); 822 823 mark_inode_dirty(inode); 824 825 out: 826 return err; 827 } 828 829 static int ntfs_writepage(struct page *page, struct writeback_control *wbc) 830 { 831 struct address_space *mapping = page->mapping; 832 struct inode *inode = mapping->host; 833 struct ntfs_inode *ni = ntfs_i(inode); 834 int err; 835 836 if (is_resident(ni)) { 837 ni_lock(ni); 838 err = attr_data_write_resident(ni, page); 839 ni_unlock(ni); 840 if (err != E_NTFS_NONRESIDENT) { 841 unlock_page(page); 842 return err; 843 } 844 } 845 846 return block_write_full_page(page, ntfs_get_block, wbc); 847 } 848 849 static int ntfs_writepages(struct address_space *mapping, 850 struct writeback_control *wbc) 851 { 852 /* Redirect call to 'ntfs_writepage' for resident files. */ 853 if (is_resident(ntfs_i(mapping->host))) 854 return generic_writepages(mapping, wbc); 855 return mpage_writepages(mapping, wbc, ntfs_get_block); 856 } 857 858 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 859 struct buffer_head *bh_result, int create) 860 { 861 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 862 bh_result, create, GET_BLOCK_WRITE_BEGIN); 863 } 864 865 int ntfs_write_begin(struct file *file, struct address_space *mapping, 866 loff_t pos, u32 len, struct page **pagep, 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); 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, 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 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 struct inode *inode = mapping->host; 912 struct ntfs_inode *ni = ntfs_i(inode); 913 u64 valid = ni->i_valid; 914 bool dirty = false; 915 int err; 916 917 if (is_resident(ni)) { 918 ni_lock(ni); 919 err = attr_data_write_resident(ni, page); 920 ni_unlock(ni); 921 if (!err) { 922 dirty = true; 923 /* Clear any buffers in page. */ 924 if (page_has_buffers(page)) { 925 struct buffer_head *head, *bh; 926 927 bh = head = page_buffers(page); 928 do { 929 clear_buffer_dirty(bh); 930 clear_buffer_mapped(bh); 931 set_buffer_uptodate(bh); 932 } while (head != (bh = bh->b_this_page)); 933 } 934 SetPageUptodate(page); 935 err = copied; 936 } 937 unlock_page(page); 938 put_page(page); 939 } else { 940 err = generic_write_end(file, mapping, pos, len, copied, page, 941 fsdata); 942 } 943 944 if (err >= 0) { 945 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 946 inode->i_ctime = inode->i_mtime = current_time(inode); 947 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 948 dirty = true; 949 } 950 951 if (valid != ni->i_valid) { 952 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 953 dirty = true; 954 } 955 956 if (dirty) 957 mark_inode_dirty(inode); 958 } 959 960 return err; 961 } 962 963 int reset_log_file(struct inode *inode) 964 { 965 int err; 966 loff_t pos = 0; 967 u32 log_size = inode->i_size; 968 struct address_space *mapping = inode->i_mapping; 969 970 for (;;) { 971 u32 len; 972 void *kaddr; 973 struct page *page; 974 975 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 976 977 err = block_write_begin(mapping, pos, len, &page, 978 ntfs_get_block_write_begin); 979 if (err) 980 goto out; 981 982 kaddr = kmap_atomic(page); 983 memset(kaddr, -1, len); 984 kunmap_atomic(kaddr); 985 flush_dcache_page(page); 986 987 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 988 if (err < 0) 989 goto out; 990 pos += len; 991 992 if (pos >= log_size) 993 break; 994 balance_dirty_pages_ratelimited(mapping); 995 } 996 out: 997 mark_inode_dirty_sync(inode); 998 999 return err; 1000 } 1001 1002 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1003 { 1004 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1005 } 1006 1007 int ntfs_sync_inode(struct inode *inode) 1008 { 1009 return _ni_write_inode(inode, 1); 1010 } 1011 1012 /* 1013 * writeback_inode - Helper function for ntfs_flush_inodes(). 1014 * 1015 * This writes both the inode and the file data blocks, waiting 1016 * for in flight data blocks before the start of the call. It 1017 * does not wait for any io started during the call. 1018 */ 1019 static int writeback_inode(struct inode *inode) 1020 { 1021 int ret = sync_inode_metadata(inode, 0); 1022 1023 if (!ret) 1024 ret = filemap_fdatawrite(inode->i_mapping); 1025 return ret; 1026 } 1027 1028 /* 1029 * ntfs_flush_inodes 1030 * 1031 * Write data and metadata corresponding to i1 and i2. The io is 1032 * started but we do not wait for any of it to finish. 1033 * 1034 * filemap_flush() is used for the block device, so if there is a dirty 1035 * page for a block already in flight, we will not wait and start the 1036 * io over again. 1037 */ 1038 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1039 struct inode *i2) 1040 { 1041 int ret = 0; 1042 1043 if (i1) 1044 ret = writeback_inode(i1); 1045 if (!ret && i2) 1046 ret = writeback_inode(i2); 1047 if (!ret) 1048 ret = sync_blockdev_nowait(sb->s_bdev); 1049 return ret; 1050 } 1051 1052 int inode_write_data(struct inode *inode, const void *data, size_t bytes) 1053 { 1054 pgoff_t idx; 1055 1056 /* Write non resident data. */ 1057 for (idx = 0; bytes; idx++) { 1058 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1059 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1060 1061 if (IS_ERR(page)) 1062 return PTR_ERR(page); 1063 1064 lock_page(page); 1065 WARN_ON(!PageUptodate(page)); 1066 ClearPageUptodate(page); 1067 1068 memcpy(page_address(page), data, op); 1069 1070 flush_dcache_page(page); 1071 SetPageUptodate(page); 1072 unlock_page(page); 1073 1074 ntfs_unmap_page(page); 1075 1076 bytes -= op; 1077 data = Add2Ptr(data, PAGE_SIZE); 1078 } 1079 return 0; 1080 } 1081 1082 /* 1083 * ntfs_reparse_bytes 1084 * 1085 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1086 * for unicode string of @uni_len length. 1087 */ 1088 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1089 { 1090 /* Header + unicode string + decorated unicode string. */ 1091 return sizeof(short) * (2 * uni_len + 4) + 1092 offsetof(struct REPARSE_DATA_BUFFER, 1093 SymbolicLinkReparseBuffer.PathBuffer); 1094 } 1095 1096 static struct REPARSE_DATA_BUFFER * 1097 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1098 u32 size, u16 *nsize) 1099 { 1100 int i, err; 1101 struct REPARSE_DATA_BUFFER *rp; 1102 __le16 *rp_name; 1103 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1104 1105 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1106 if (!rp) 1107 return ERR_PTR(-ENOMEM); 1108 1109 rs = &rp->SymbolicLinkReparseBuffer; 1110 rp_name = rs->PathBuffer; 1111 1112 /* Convert link name to UTF-16. */ 1113 err = ntfs_nls_to_utf16(sbi, symname, size, 1114 (struct cpu_str *)(rp_name - 1), 2 * size, 1115 UTF16_LITTLE_ENDIAN); 1116 if (err < 0) 1117 goto out; 1118 1119 /* err = the length of unicode name of symlink. */ 1120 *nsize = ntfs_reparse_bytes(err); 1121 1122 if (*nsize > sbi->reparse.max_size) { 1123 err = -EFBIG; 1124 goto out; 1125 } 1126 1127 /* Translate Linux '/' into Windows '\'. */ 1128 for (i = 0; i < err; i++) { 1129 if (rp_name[i] == cpu_to_le16('/')) 1130 rp_name[i] = cpu_to_le16('\\'); 1131 } 1132 1133 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1134 rp->ReparseDataLength = 1135 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1136 SymbolicLinkReparseBuffer)); 1137 1138 /* PrintName + SubstituteName. */ 1139 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1140 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1141 rs->PrintNameLength = rs->SubstituteNameOffset; 1142 1143 /* 1144 * TODO: Use relative path if possible to allow Windows to 1145 * parse this path. 1146 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1147 */ 1148 rs->Flags = 0; 1149 1150 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1151 1152 /* Decorate SubstituteName. */ 1153 rp_name += err; 1154 rp_name[0] = cpu_to_le16('\\'); 1155 rp_name[1] = cpu_to_le16('?'); 1156 rp_name[2] = cpu_to_le16('?'); 1157 rp_name[3] = cpu_to_le16('\\'); 1158 1159 return rp; 1160 out: 1161 kfree(rp); 1162 return ERR_PTR(err); 1163 } 1164 1165 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns, 1166 struct inode *dir, struct dentry *dentry, 1167 const struct cpu_str *uni, umode_t mode, 1168 dev_t dev, const char *symname, u32 size, 1169 struct ntfs_fnd *fnd) 1170 { 1171 int err; 1172 struct super_block *sb = dir->i_sb; 1173 struct ntfs_sb_info *sbi = sb->s_fs_info; 1174 const struct qstr *name = &dentry->d_name; 1175 CLST ino = 0; 1176 struct ntfs_inode *dir_ni = ntfs_i(dir); 1177 struct ntfs_inode *ni = NULL; 1178 struct inode *inode = NULL; 1179 struct ATTRIB *attr; 1180 struct ATTR_STD_INFO5 *std5; 1181 struct ATTR_FILE_NAME *fname; 1182 struct MFT_REC *rec; 1183 u32 asize, dsize, sd_size; 1184 enum FILE_ATTRIBUTE fa; 1185 __le32 security_id = SECURITY_ID_INVALID; 1186 CLST vcn; 1187 const void *sd; 1188 u16 t16, nsize = 0, aid = 0; 1189 struct INDEX_ROOT *root, *dir_root; 1190 struct NTFS_DE *e, *new_de = NULL; 1191 struct REPARSE_DATA_BUFFER *rp = NULL; 1192 bool rp_inserted = false; 1193 1194 ni_lock_dir(dir_ni); 1195 1196 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1197 if (!dir_root) { 1198 err = -EINVAL; 1199 goto out1; 1200 } 1201 1202 if (S_ISDIR(mode)) { 1203 /* Use parent's directory attributes. */ 1204 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1205 FILE_ATTRIBUTE_ARCHIVE; 1206 /* 1207 * By default child directory inherits parent attributes. 1208 * Root directory is hidden + system. 1209 * Make an exception for children in root. 1210 */ 1211 if (dir->i_ino == MFT_REC_ROOT) 1212 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1213 } else if (S_ISLNK(mode)) { 1214 /* It is good idea that link should be the same type (file/dir) as target */ 1215 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1216 1217 /* 1218 * Linux: there are dir/file/symlink and so on. 1219 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1220 * It is good idea to create: 1221 * dir + reparse if 'symname' points to directory 1222 * or 1223 * file + reparse if 'symname' points to file 1224 * Unfortunately kern_path hangs if symname contains 'dir'. 1225 */ 1226 1227 /* 1228 * struct path path; 1229 * 1230 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1231 * struct inode *target = d_inode(path.dentry); 1232 * 1233 * if (S_ISDIR(target->i_mode)) 1234 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1235 * // if ( target->i_sb == sb ){ 1236 * // use relative path? 1237 * // } 1238 * path_put(&path); 1239 * } 1240 */ 1241 } else if (S_ISREG(mode)) { 1242 if (sbi->options->sparse) { 1243 /* Sparsed regular file, cause option 'sparse'. */ 1244 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1245 FILE_ATTRIBUTE_ARCHIVE; 1246 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1247 /* Compressed regular file, if parent is compressed. */ 1248 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1249 } else { 1250 /* Regular file, default attributes. */ 1251 fa = FILE_ATTRIBUTE_ARCHIVE; 1252 } 1253 } else { 1254 fa = FILE_ATTRIBUTE_ARCHIVE; 1255 } 1256 1257 if (!(mode & 0222)) 1258 fa |= FILE_ATTRIBUTE_READONLY; 1259 1260 /* Allocate PATH_MAX bytes. */ 1261 new_de = __getname(); 1262 if (!new_de) { 1263 err = -ENOMEM; 1264 goto out1; 1265 } 1266 1267 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1268 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1269 1270 /* Step 1: allocate and fill new mft record. */ 1271 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1272 if (err) 1273 goto out2; 1274 1275 ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY); 1276 if (IS_ERR(ni)) { 1277 err = PTR_ERR(ni); 1278 ni = NULL; 1279 goto out3; 1280 } 1281 inode = &ni->vfs_inode; 1282 inode_init_owner(mnt_userns, inode, dir, mode); 1283 mode = inode->i_mode; 1284 1285 inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime = 1286 current_time(inode); 1287 1288 rec = ni->mi.mrec; 1289 rec->hard_links = cpu_to_le16(1); 1290 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1291 1292 /* Get default security id. */ 1293 sd = s_default_security; 1294 sd_size = sizeof(s_default_security); 1295 1296 if (is_ntfs3(sbi)) { 1297 security_id = dir_ni->std_security_id; 1298 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1299 security_id = sbi->security.def_security_id; 1300 1301 if (security_id == SECURITY_ID_INVALID && 1302 !ntfs_insert_security(sbi, sd, sd_size, 1303 &security_id, NULL)) 1304 sbi->security.def_security_id = security_id; 1305 } 1306 } 1307 1308 /* Insert standard info. */ 1309 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1310 1311 if (security_id == SECURITY_ID_INVALID) { 1312 dsize = sizeof(struct ATTR_STD_INFO); 1313 } else { 1314 dsize = sizeof(struct ATTR_STD_INFO5); 1315 std5->security_id = security_id; 1316 ni->std_security_id = security_id; 1317 } 1318 asize = SIZEOF_RESIDENT + dsize; 1319 1320 attr->type = ATTR_STD; 1321 attr->size = cpu_to_le32(asize); 1322 attr->id = cpu_to_le16(aid++); 1323 attr->res.data_off = SIZEOF_RESIDENT_LE; 1324 attr->res.data_size = cpu_to_le32(dsize); 1325 1326 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1327 kernel2nt(&inode->i_atime); 1328 1329 ni->std_fa = fa; 1330 std5->fa = fa; 1331 1332 attr = Add2Ptr(attr, asize); 1333 1334 /* Insert file name. */ 1335 err = fill_name_de(sbi, new_de, name, uni); 1336 if (err) 1337 goto out4; 1338 1339 mi_get_ref(&ni->mi, &new_de->ref); 1340 1341 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1342 mi_get_ref(&dir_ni->mi, &fname->home); 1343 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1344 fname->dup.a_time = std5->cr_time; 1345 fname->dup.alloc_size = fname->dup.data_size = 0; 1346 fname->dup.fa = std5->fa; 1347 fname->dup.ea_size = fname->dup.reparse = 0; 1348 1349 dsize = le16_to_cpu(new_de->key_size); 1350 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1351 1352 attr->type = ATTR_NAME; 1353 attr->size = cpu_to_le32(asize); 1354 attr->res.data_off = SIZEOF_RESIDENT_LE; 1355 attr->res.flags = RESIDENT_FLAG_INDEXED; 1356 attr->id = cpu_to_le16(aid++); 1357 attr->res.data_size = cpu_to_le32(dsize); 1358 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1359 1360 attr = Add2Ptr(attr, asize); 1361 1362 if (security_id == SECURITY_ID_INVALID) { 1363 /* Insert security attribute. */ 1364 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1365 1366 attr->type = ATTR_SECURE; 1367 attr->size = cpu_to_le32(asize); 1368 attr->id = cpu_to_le16(aid++); 1369 attr->res.data_off = SIZEOF_RESIDENT_LE; 1370 attr->res.data_size = cpu_to_le32(sd_size); 1371 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1372 1373 attr = Add2Ptr(attr, asize); 1374 } 1375 1376 attr->id = cpu_to_le16(aid++); 1377 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1378 /* 1379 * Regular directory or symlink to directory. 1380 * Create root attribute. 1381 */ 1382 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1383 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1384 1385 attr->type = ATTR_ROOT; 1386 attr->size = cpu_to_le32(asize); 1387 1388 attr->name_len = ARRAY_SIZE(I30_NAME); 1389 attr->name_off = SIZEOF_RESIDENT_LE; 1390 attr->res.data_off = 1391 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1392 attr->res.data_size = cpu_to_le32(dsize); 1393 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1394 sizeof(I30_NAME)); 1395 1396 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1397 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1398 root->ihdr.de_off = 1399 cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10 1400 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1401 sizeof(struct NTFS_DE)); 1402 root->ihdr.total = root->ihdr.used; 1403 1404 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1405 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1406 e->flags = NTFS_IE_LAST; 1407 } else if (S_ISLNK(mode)) { 1408 /* 1409 * Symlink to file. 1410 * Create empty resident data attribute. 1411 */ 1412 asize = SIZEOF_RESIDENT; 1413 1414 /* Insert empty ATTR_DATA */ 1415 attr->type = ATTR_DATA; 1416 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1417 attr->name_off = SIZEOF_RESIDENT_LE; 1418 attr->res.data_off = SIZEOF_RESIDENT_LE; 1419 } else if (S_ISREG(mode)) { 1420 /* 1421 * Regular file. Create empty non resident data attribute. 1422 */ 1423 attr->type = ATTR_DATA; 1424 attr->non_res = 1; 1425 attr->nres.evcn = cpu_to_le64(-1ll); 1426 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1427 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1428 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1429 attr->flags = ATTR_FLAG_SPARSED; 1430 asize = SIZEOF_NONRESIDENT_EX + 8; 1431 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1432 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1433 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1434 attr->flags = ATTR_FLAG_COMPRESSED; 1435 attr->nres.c_unit = COMPRESSION_UNIT; 1436 asize = SIZEOF_NONRESIDENT_EX + 8; 1437 } else { 1438 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1439 attr->name_off = SIZEOF_NONRESIDENT_LE; 1440 asize = SIZEOF_NONRESIDENT + 8; 1441 } 1442 attr->nres.run_off = attr->name_off; 1443 } else { 1444 /* 1445 * Node. Create empty resident data attribute. 1446 */ 1447 attr->type = ATTR_DATA; 1448 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1449 attr->name_off = SIZEOF_RESIDENT_LE; 1450 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1451 attr->flags = ATTR_FLAG_SPARSED; 1452 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1453 attr->flags = ATTR_FLAG_COMPRESSED; 1454 attr->res.data_off = SIZEOF_RESIDENT_LE; 1455 asize = SIZEOF_RESIDENT; 1456 ni->ni_flags |= NI_FLAG_RESIDENT; 1457 } 1458 1459 if (S_ISDIR(mode)) { 1460 ni->ni_flags |= NI_FLAG_DIR; 1461 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1462 if (err) 1463 goto out4; 1464 } else if (S_ISLNK(mode)) { 1465 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1466 1467 if (IS_ERR(rp)) { 1468 err = PTR_ERR(rp); 1469 rp = NULL; 1470 goto out4; 1471 } 1472 1473 /* 1474 * Insert ATTR_REPARSE. 1475 */ 1476 attr = Add2Ptr(attr, asize); 1477 attr->type = ATTR_REPARSE; 1478 attr->id = cpu_to_le16(aid++); 1479 1480 /* Resident or non resident? */ 1481 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1482 t16 = PtrOffset(rec, attr); 1483 1484 /* 1485 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1486 * It is good idea to keep extened attributes resident. 1487 */ 1488 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1489 CLST alen; 1490 CLST clst = bytes_to_cluster(sbi, nsize); 1491 1492 /* Bytes per runs. */ 1493 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1494 1495 attr->non_res = 1; 1496 attr->nres.evcn = cpu_to_le64(clst - 1); 1497 attr->name_off = SIZEOF_NONRESIDENT_LE; 1498 attr->nres.run_off = attr->name_off; 1499 attr->nres.data_size = cpu_to_le64(nsize); 1500 attr->nres.valid_size = attr->nres.data_size; 1501 attr->nres.alloc_size = 1502 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1503 1504 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1505 clst, NULL, 0, &alen, 0, 1506 NULL); 1507 if (err) 1508 goto out5; 1509 1510 err = run_pack(&ni->file.run, 0, clst, 1511 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1512 &vcn); 1513 if (err < 0) 1514 goto out5; 1515 1516 if (vcn != clst) { 1517 err = -EINVAL; 1518 goto out5; 1519 } 1520 1521 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1522 } else { 1523 attr->res.data_off = SIZEOF_RESIDENT_LE; 1524 attr->res.data_size = cpu_to_le32(nsize); 1525 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1526 nsize = 0; 1527 } 1528 /* Size of symlink equals the length of input string. */ 1529 inode->i_size = size; 1530 1531 attr->size = cpu_to_le32(asize); 1532 1533 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1534 &new_de->ref); 1535 if (err) 1536 goto out5; 1537 1538 rp_inserted = true; 1539 } 1540 1541 attr = Add2Ptr(attr, asize); 1542 attr->type = ATTR_END; 1543 1544 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1545 rec->next_attr_id = cpu_to_le16(aid); 1546 1547 /* Step 2: Add new name in index. */ 1548 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1549 if (err) 1550 goto out6; 1551 1552 /* Unlock parent directory before ntfs_init_acl. */ 1553 ni_unlock(dir_ni); 1554 1555 inode->i_generation = le16_to_cpu(rec->seq); 1556 1557 dir->i_mtime = dir->i_ctime = inode->i_atime; 1558 1559 if (S_ISDIR(mode)) { 1560 inode->i_op = &ntfs_dir_inode_operations; 1561 inode->i_fop = &ntfs_dir_operations; 1562 } else if (S_ISLNK(mode)) { 1563 inode->i_op = &ntfs_link_inode_operations; 1564 inode->i_fop = NULL; 1565 inode->i_mapping->a_ops = &ntfs_aops; 1566 inode->i_size = size; 1567 inode_nohighmem(inode); 1568 } else if (S_ISREG(mode)) { 1569 inode->i_op = &ntfs_file_inode_operations; 1570 inode->i_fop = &ntfs_file_operations; 1571 inode->i_mapping->a_ops = 1572 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops; 1573 init_rwsem(&ni->file.run_lock); 1574 } else { 1575 inode->i_op = &ntfs_special_inode_operations; 1576 init_special_inode(inode, mode, dev); 1577 } 1578 1579 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1580 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1581 err = ntfs_init_acl(mnt_userns, inode, dir); 1582 if (err) 1583 goto out7; 1584 } else 1585 #endif 1586 { 1587 inode->i_flags |= S_NOSEC; 1588 } 1589 1590 /* Write non resident data. */ 1591 if (nsize) { 1592 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0); 1593 if (err) 1594 goto out7; 1595 } 1596 1597 /* 1598 * Call 'd_instantiate' after inode->i_op is set 1599 * but before finish_open. 1600 */ 1601 d_instantiate(dentry, inode); 1602 1603 ntfs_save_wsl_perm(inode); 1604 mark_inode_dirty(dir); 1605 mark_inode_dirty(inode); 1606 1607 /* Normal exit. */ 1608 goto out2; 1609 1610 out7: 1611 1612 /* Undo 'indx_insert_entry'. */ 1613 ni_lock_dir(dir_ni); 1614 indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1, 1615 le16_to_cpu(new_de->key_size), sbi); 1616 /* ni_unlock(dir_ni); will be called later. */ 1617 out6: 1618 if (rp_inserted) 1619 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1620 1621 out5: 1622 if (S_ISDIR(mode) || run_is_empty(&ni->file.run)) 1623 goto out4; 1624 1625 run_deallocate(sbi, &ni->file.run, false); 1626 1627 out4: 1628 clear_rec_inuse(rec); 1629 clear_nlink(inode); 1630 ni->mi.dirty = false; 1631 discard_new_inode(inode); 1632 out3: 1633 ntfs_mark_rec_free(sbi, ino, false); 1634 1635 out2: 1636 __putname(new_de); 1637 kfree(rp); 1638 1639 out1: 1640 if (err) { 1641 ni_unlock(dir_ni); 1642 return ERR_PTR(err); 1643 } 1644 1645 unlock_new_inode(inode); 1646 1647 return inode; 1648 } 1649 1650 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1651 { 1652 int err; 1653 struct ntfs_inode *ni = ntfs_i(inode); 1654 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1655 struct NTFS_DE *de; 1656 1657 /* Allocate PATH_MAX bytes. */ 1658 de = __getname(); 1659 if (!de) 1660 return -ENOMEM; 1661 1662 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1663 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1664 1665 /* Construct 'de'. */ 1666 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1667 if (err) 1668 goto out; 1669 1670 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1671 out: 1672 __putname(de); 1673 return err; 1674 } 1675 1676 /* 1677 * ntfs_unlink_inode 1678 * 1679 * inode_operations::unlink 1680 * inode_operations::rmdir 1681 */ 1682 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1683 { 1684 int err; 1685 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1686 struct inode *inode = d_inode(dentry); 1687 struct ntfs_inode *ni = ntfs_i(inode); 1688 struct ntfs_inode *dir_ni = ntfs_i(dir); 1689 struct NTFS_DE *de, *de2 = NULL; 1690 int undo_remove; 1691 1692 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1693 return -EINVAL; 1694 1695 /* Allocate PATH_MAX bytes. */ 1696 de = __getname(); 1697 if (!de) 1698 return -ENOMEM; 1699 1700 ni_lock(ni); 1701 1702 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1703 err = -ENOTEMPTY; 1704 goto out; 1705 } 1706 1707 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1708 if (err < 0) 1709 goto out; 1710 1711 undo_remove = 0; 1712 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1713 1714 if (!err) { 1715 drop_nlink(inode); 1716 dir->i_mtime = dir->i_ctime = current_time(dir); 1717 mark_inode_dirty(dir); 1718 inode->i_ctime = dir->i_ctime; 1719 if (inode->i_nlink) 1720 mark_inode_dirty(inode); 1721 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1722 _ntfs_bad_inode(inode); 1723 } else { 1724 if (ni_is_dirty(dir)) 1725 mark_inode_dirty(dir); 1726 if (ni_is_dirty(inode)) 1727 mark_inode_dirty(inode); 1728 } 1729 1730 out: 1731 ni_unlock(ni); 1732 __putname(de); 1733 return err; 1734 } 1735 1736 void ntfs_evict_inode(struct inode *inode) 1737 { 1738 truncate_inode_pages_final(&inode->i_data); 1739 1740 if (inode->i_nlink) 1741 _ni_write_inode(inode, inode_needs_sync(inode)); 1742 1743 invalidate_inode_buffers(inode); 1744 clear_inode(inode); 1745 1746 ni_clear(ntfs_i(inode)); 1747 } 1748 1749 static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer, 1750 int buflen) 1751 { 1752 int i, err = -EINVAL; 1753 struct ntfs_inode *ni = ntfs_i(inode); 1754 struct super_block *sb = inode->i_sb; 1755 struct ntfs_sb_info *sbi = sb->s_fs_info; 1756 u64 size; 1757 u16 ulen = 0; 1758 void *to_free = NULL; 1759 struct REPARSE_DATA_BUFFER *rp; 1760 const __le16 *uname; 1761 struct ATTRIB *attr; 1762 1763 /* Reparse data present. Try to parse it. */ 1764 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1765 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1766 1767 *buffer = 0; 1768 1769 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1770 if (!attr) 1771 goto out; 1772 1773 if (!attr->non_res) { 1774 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1775 if (!rp) 1776 goto out; 1777 size = le32_to_cpu(attr->res.data_size); 1778 } else { 1779 size = le64_to_cpu(attr->nres.data_size); 1780 rp = NULL; 1781 } 1782 1783 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1784 goto out; 1785 1786 if (!rp) { 1787 rp = kmalloc(size, GFP_NOFS); 1788 if (!rp) { 1789 err = -ENOMEM; 1790 goto out; 1791 } 1792 to_free = rp; 1793 /* Read into temporal buffer. */ 1794 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1795 if (err) 1796 goto out; 1797 } 1798 1799 /* Microsoft Tag. */ 1800 switch (rp->ReparseTag) { 1801 case IO_REPARSE_TAG_MOUNT_POINT: 1802 /* Mount points and junctions. */ 1803 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1804 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1805 MountPointReparseBuffer.PathBuffer)) 1806 goto out; 1807 uname = Add2Ptr(rp, 1808 offsetof(struct REPARSE_DATA_BUFFER, 1809 MountPointReparseBuffer.PathBuffer) + 1810 le16_to_cpu(rp->MountPointReparseBuffer 1811 .PrintNameOffset)); 1812 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1813 break; 1814 1815 case IO_REPARSE_TAG_SYMLINK: 1816 /* FolderSymbolicLink */ 1817 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1818 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1819 SymbolicLinkReparseBuffer.PathBuffer)) 1820 goto out; 1821 uname = Add2Ptr( 1822 rp, offsetof(struct REPARSE_DATA_BUFFER, 1823 SymbolicLinkReparseBuffer.PathBuffer) + 1824 le16_to_cpu(rp->SymbolicLinkReparseBuffer 1825 .PrintNameOffset)); 1826 ulen = le16_to_cpu( 1827 rp->SymbolicLinkReparseBuffer.PrintNameLength); 1828 break; 1829 1830 case IO_REPARSE_TAG_CLOUD: 1831 case IO_REPARSE_TAG_CLOUD_1: 1832 case IO_REPARSE_TAG_CLOUD_2: 1833 case IO_REPARSE_TAG_CLOUD_3: 1834 case IO_REPARSE_TAG_CLOUD_4: 1835 case IO_REPARSE_TAG_CLOUD_5: 1836 case IO_REPARSE_TAG_CLOUD_6: 1837 case IO_REPARSE_TAG_CLOUD_7: 1838 case IO_REPARSE_TAG_CLOUD_8: 1839 case IO_REPARSE_TAG_CLOUD_9: 1840 case IO_REPARSE_TAG_CLOUD_A: 1841 case IO_REPARSE_TAG_CLOUD_B: 1842 case IO_REPARSE_TAG_CLOUD_C: 1843 case IO_REPARSE_TAG_CLOUD_D: 1844 case IO_REPARSE_TAG_CLOUD_E: 1845 case IO_REPARSE_TAG_CLOUD_F: 1846 err = sizeof("OneDrive") - 1; 1847 if (err > buflen) 1848 err = buflen; 1849 memcpy(buffer, "OneDrive", err); 1850 goto out; 1851 1852 default: 1853 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 1854 /* Unknown Microsoft Tag. */ 1855 goto out; 1856 } 1857 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 1858 size <= sizeof(struct REPARSE_POINT)) { 1859 goto out; 1860 } 1861 1862 /* Users tag. */ 1863 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 1864 ulen = le16_to_cpu(rp->ReparseDataLength) - 1865 sizeof(struct REPARSE_POINT); 1866 } 1867 1868 /* Convert nlen from bytes to UNICODE chars. */ 1869 ulen >>= 1; 1870 1871 /* Check that name is available. */ 1872 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 1873 goto out; 1874 1875 /* If name is already zero terminated then truncate it now. */ 1876 if (!uname[ulen - 1]) 1877 ulen -= 1; 1878 1879 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 1880 1881 if (err < 0) 1882 goto out; 1883 1884 /* Translate Windows '\' into Linux '/'. */ 1885 for (i = 0; i < err; i++) { 1886 if (buffer[i] == '\\') 1887 buffer[i] = '/'; 1888 } 1889 1890 /* Always set last zero. */ 1891 buffer[err] = 0; 1892 out: 1893 kfree(to_free); 1894 return err; 1895 } 1896 1897 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 1898 struct delayed_call *done) 1899 { 1900 int err; 1901 char *ret; 1902 1903 if (!de) 1904 return ERR_PTR(-ECHILD); 1905 1906 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 1907 if (!ret) 1908 return ERR_PTR(-ENOMEM); 1909 1910 err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE); 1911 if (err < 0) { 1912 kfree(ret); 1913 return ERR_PTR(err); 1914 } 1915 1916 set_delayed_call(done, kfree_link, ret); 1917 1918 return ret; 1919 } 1920 1921 // clang-format off 1922 const struct inode_operations ntfs_link_inode_operations = { 1923 .get_link = ntfs_get_link, 1924 .setattr = ntfs3_setattr, 1925 .listxattr = ntfs_listxattr, 1926 .permission = ntfs_permission, 1927 }; 1928 1929 const struct address_space_operations ntfs_aops = { 1930 .read_folio = ntfs_read_folio, 1931 .readahead = ntfs_readahead, 1932 .writepage = ntfs_writepage, 1933 .writepages = ntfs_writepages, 1934 .write_begin = ntfs_write_begin, 1935 .write_end = ntfs_write_end, 1936 .direct_IO = ntfs_direct_IO, 1937 .bmap = ntfs_bmap, 1938 .dirty_folio = block_dirty_folio, 1939 .invalidate_folio = block_invalidate_folio, 1940 }; 1941 1942 const struct address_space_operations ntfs_aops_cmpr = { 1943 .read_folio = ntfs_read_folio, 1944 .readahead = ntfs_readahead, 1945 }; 1946 // clang-format on 1947