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_read_folio(struct file *file, struct folio *folio) 680 { 681 struct page *page = &folio->page; 682 int err; 683 struct address_space *mapping = page->mapping; 684 struct inode *inode = mapping->host; 685 struct ntfs_inode *ni = ntfs_i(inode); 686 687 if (is_resident(ni)) { 688 ni_lock(ni); 689 err = attr_data_read_resident(ni, page); 690 ni_unlock(ni); 691 if (err != E_NTFS_NONRESIDENT) { 692 unlock_page(page); 693 return err; 694 } 695 } 696 697 if (is_compressed(ni)) { 698 ni_lock(ni); 699 err = ni_readpage_cmpr(ni, page); 700 ni_unlock(ni); 701 return err; 702 } 703 704 /* Normal + sparse files. */ 705 return mpage_read_folio(folio, ntfs_get_block); 706 } 707 708 static void ntfs_readahead(struct readahead_control *rac) 709 { 710 struct address_space *mapping = rac->mapping; 711 struct inode *inode = mapping->host; 712 struct ntfs_inode *ni = ntfs_i(inode); 713 u64 valid; 714 loff_t pos; 715 716 if (is_resident(ni)) { 717 /* No readahead for resident. */ 718 return; 719 } 720 721 if (is_compressed(ni)) { 722 /* No readahead for compressed. */ 723 return; 724 } 725 726 valid = ni->i_valid; 727 pos = readahead_pos(rac); 728 729 if (valid < i_size_read(inode) && pos <= valid && 730 valid < pos + readahead_length(rac)) { 731 /* Range cross 'valid'. Read it page by page. */ 732 return; 733 } 734 735 mpage_readahead(rac, ntfs_get_block); 736 } 737 738 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 739 struct buffer_head *bh_result, int create) 740 { 741 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 742 bh_result, create, GET_BLOCK_DIRECT_IO_R); 743 } 744 745 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 746 struct buffer_head *bh_result, int create) 747 { 748 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 749 bh_result, create, GET_BLOCK_DIRECT_IO_W); 750 } 751 752 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 753 { 754 struct file *file = iocb->ki_filp; 755 struct address_space *mapping = file->f_mapping; 756 struct inode *inode = mapping->host; 757 struct ntfs_inode *ni = ntfs_i(inode); 758 loff_t vbo = iocb->ki_pos; 759 loff_t end; 760 int wr = iov_iter_rw(iter) & WRITE; 761 size_t iter_count = iov_iter_count(iter); 762 loff_t valid; 763 ssize_t ret; 764 765 if (is_resident(ni)) { 766 /* Switch to buffered write. */ 767 ret = 0; 768 goto out; 769 } 770 771 ret = blockdev_direct_IO(iocb, inode, iter, 772 wr ? ntfs_get_block_direct_IO_W 773 : ntfs_get_block_direct_IO_R); 774 775 if (ret > 0) 776 end = vbo + ret; 777 else if (wr && ret == -EIOCBQUEUED) 778 end = vbo + iter_count; 779 else 780 goto out; 781 782 valid = ni->i_valid; 783 if (wr) { 784 if (end > valid && !S_ISBLK(inode->i_mode)) { 785 ni->i_valid = end; 786 mark_inode_dirty(inode); 787 } 788 } else if (vbo < valid && valid < end) { 789 /* Fix page. */ 790 iov_iter_revert(iter, end - valid); 791 iov_iter_zero(end - valid, iter); 792 } 793 794 out: 795 return ret; 796 } 797 798 int ntfs_set_size(struct inode *inode, u64 new_size) 799 { 800 struct super_block *sb = inode->i_sb; 801 struct ntfs_sb_info *sbi = sb->s_fs_info; 802 struct ntfs_inode *ni = ntfs_i(inode); 803 int err; 804 805 /* Check for maximum file size. */ 806 if (is_sparsed(ni) || is_compressed(ni)) { 807 if (new_size > sbi->maxbytes_sparse) { 808 err = -EFBIG; 809 goto out; 810 } 811 } else if (new_size > sbi->maxbytes) { 812 err = -EFBIG; 813 goto out; 814 } 815 816 ni_lock(ni); 817 down_write(&ni->file.run_lock); 818 819 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 820 &ni->i_valid, true, NULL); 821 822 up_write(&ni->file.run_lock); 823 ni_unlock(ni); 824 825 mark_inode_dirty(inode); 826 827 out: 828 return err; 829 } 830 831 static int ntfs_writepage(struct page *page, struct writeback_control *wbc) 832 { 833 struct address_space *mapping = page->mapping; 834 struct inode *inode = mapping->host; 835 struct ntfs_inode *ni = ntfs_i(inode); 836 int err; 837 838 if (is_resident(ni)) { 839 ni_lock(ni); 840 err = attr_data_write_resident(ni, page); 841 ni_unlock(ni); 842 if (err != E_NTFS_NONRESIDENT) { 843 unlock_page(page); 844 return err; 845 } 846 } 847 848 return block_write_full_page(page, ntfs_get_block, wbc); 849 } 850 851 static int ntfs_writepages(struct address_space *mapping, 852 struct writeback_control *wbc) 853 { 854 struct inode *inode = mapping->host; 855 struct ntfs_inode *ni = ntfs_i(inode); 856 /* Redirect call to 'ntfs_writepage' for resident files. */ 857 get_block_t *get_block = is_resident(ni) ? NULL : &ntfs_get_block; 858 859 return mpage_writepages(mapping, wbc, get_block); 860 } 861 862 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 863 struct buffer_head *bh_result, int create) 864 { 865 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 866 bh_result, create, GET_BLOCK_WRITE_BEGIN); 867 } 868 869 int ntfs_write_begin(struct file *file, struct address_space *mapping, 870 loff_t pos, u32 len, struct page **pagep, void **fsdata) 871 { 872 int err; 873 struct inode *inode = mapping->host; 874 struct ntfs_inode *ni = ntfs_i(inode); 875 876 *pagep = NULL; 877 if (is_resident(ni)) { 878 struct page *page = grab_cache_page_write_begin( 879 mapping, pos >> PAGE_SHIFT); 880 881 if (!page) { 882 err = -ENOMEM; 883 goto out; 884 } 885 886 ni_lock(ni); 887 err = attr_data_read_resident(ni, page); 888 ni_unlock(ni); 889 890 if (!err) { 891 *pagep = page; 892 goto out; 893 } 894 unlock_page(page); 895 put_page(page); 896 897 if (err != E_NTFS_NONRESIDENT) 898 goto out; 899 } 900 901 err = block_write_begin(mapping, pos, len, pagep, 902 ntfs_get_block_write_begin); 903 904 out: 905 return err; 906 } 907 908 /* 909 * ntfs_write_end - Address_space_operations::write_end. 910 */ 911 int ntfs_write_end(struct file *file, struct address_space *mapping, 912 loff_t pos, u32 len, u32 copied, struct page *page, 913 void *fsdata) 914 { 915 struct inode *inode = mapping->host; 916 struct ntfs_inode *ni = ntfs_i(inode); 917 u64 valid = ni->i_valid; 918 bool dirty = false; 919 int err; 920 921 if (is_resident(ni)) { 922 ni_lock(ni); 923 err = attr_data_write_resident(ni, page); 924 ni_unlock(ni); 925 if (!err) { 926 dirty = true; 927 /* Clear any buffers in page. */ 928 if (page_has_buffers(page)) { 929 struct buffer_head *head, *bh; 930 931 bh = head = page_buffers(page); 932 do { 933 clear_buffer_dirty(bh); 934 clear_buffer_mapped(bh); 935 set_buffer_uptodate(bh); 936 } while (head != (bh = bh->b_this_page)); 937 } 938 SetPageUptodate(page); 939 err = copied; 940 } 941 unlock_page(page); 942 put_page(page); 943 } else { 944 err = generic_write_end(file, mapping, pos, len, copied, page, 945 fsdata); 946 } 947 948 if (err >= 0) { 949 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 950 inode->i_ctime = inode->i_mtime = current_time(inode); 951 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 952 dirty = true; 953 } 954 955 if (valid != ni->i_valid) { 956 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 957 dirty = true; 958 } 959 960 if (dirty) 961 mark_inode_dirty(inode); 962 } 963 964 return err; 965 } 966 967 int reset_log_file(struct inode *inode) 968 { 969 int err; 970 loff_t pos = 0; 971 u32 log_size = inode->i_size; 972 struct address_space *mapping = inode->i_mapping; 973 974 for (;;) { 975 u32 len; 976 void *kaddr; 977 struct page *page; 978 979 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 980 981 err = block_write_begin(mapping, pos, len, &page, 982 ntfs_get_block_write_begin); 983 if (err) 984 goto out; 985 986 kaddr = kmap_atomic(page); 987 memset(kaddr, -1, len); 988 kunmap_atomic(kaddr); 989 flush_dcache_page(page); 990 991 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 992 if (err < 0) 993 goto out; 994 pos += len; 995 996 if (pos >= log_size) 997 break; 998 balance_dirty_pages_ratelimited(mapping); 999 } 1000 out: 1001 mark_inode_dirty_sync(inode); 1002 1003 return err; 1004 } 1005 1006 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1007 { 1008 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1009 } 1010 1011 int ntfs_sync_inode(struct inode *inode) 1012 { 1013 return _ni_write_inode(inode, 1); 1014 } 1015 1016 /* 1017 * writeback_inode - Helper function for ntfs_flush_inodes(). 1018 * 1019 * This writes both the inode and the file data blocks, waiting 1020 * for in flight data blocks before the start of the call. It 1021 * does not wait for any io started during the call. 1022 */ 1023 static int writeback_inode(struct inode *inode) 1024 { 1025 int ret = sync_inode_metadata(inode, 0); 1026 1027 if (!ret) 1028 ret = filemap_fdatawrite(inode->i_mapping); 1029 return ret; 1030 } 1031 1032 /* 1033 * ntfs_flush_inodes 1034 * 1035 * Write data and metadata corresponding to i1 and i2. The io is 1036 * started but we do not wait for any of it to finish. 1037 * 1038 * filemap_flush() is used for the block device, so if there is a dirty 1039 * page for a block already in flight, we will not wait and start the 1040 * io over again. 1041 */ 1042 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1043 struct inode *i2) 1044 { 1045 int ret = 0; 1046 1047 if (i1) 1048 ret = writeback_inode(i1); 1049 if (!ret && i2) 1050 ret = writeback_inode(i2); 1051 if (!ret) 1052 ret = sync_blockdev_nowait(sb->s_bdev); 1053 return ret; 1054 } 1055 1056 int inode_write_data(struct inode *inode, const void *data, size_t bytes) 1057 { 1058 pgoff_t idx; 1059 1060 /* Write non resident data. */ 1061 for (idx = 0; bytes; idx++) { 1062 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1063 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1064 1065 if (IS_ERR(page)) 1066 return PTR_ERR(page); 1067 1068 lock_page(page); 1069 WARN_ON(!PageUptodate(page)); 1070 ClearPageUptodate(page); 1071 1072 memcpy(page_address(page), data, op); 1073 1074 flush_dcache_page(page); 1075 SetPageUptodate(page); 1076 unlock_page(page); 1077 1078 ntfs_unmap_page(page); 1079 1080 bytes -= op; 1081 data = Add2Ptr(data, PAGE_SIZE); 1082 } 1083 return 0; 1084 } 1085 1086 /* 1087 * ntfs_reparse_bytes 1088 * 1089 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1090 * for unicode string of @uni_len length. 1091 */ 1092 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1093 { 1094 /* Header + unicode string + decorated unicode string. */ 1095 return sizeof(short) * (2 * uni_len + 4) + 1096 offsetof(struct REPARSE_DATA_BUFFER, 1097 SymbolicLinkReparseBuffer.PathBuffer); 1098 } 1099 1100 static struct REPARSE_DATA_BUFFER * 1101 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1102 u32 size, u16 *nsize) 1103 { 1104 int i, err; 1105 struct REPARSE_DATA_BUFFER *rp; 1106 __le16 *rp_name; 1107 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1108 1109 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1110 if (!rp) 1111 return ERR_PTR(-ENOMEM); 1112 1113 rs = &rp->SymbolicLinkReparseBuffer; 1114 rp_name = rs->PathBuffer; 1115 1116 /* Convert link name to UTF-16. */ 1117 err = ntfs_nls_to_utf16(sbi, symname, size, 1118 (struct cpu_str *)(rp_name - 1), 2 * size, 1119 UTF16_LITTLE_ENDIAN); 1120 if (err < 0) 1121 goto out; 1122 1123 /* err = the length of unicode name of symlink. */ 1124 *nsize = ntfs_reparse_bytes(err); 1125 1126 if (*nsize > sbi->reparse.max_size) { 1127 err = -EFBIG; 1128 goto out; 1129 } 1130 1131 /* Translate Linux '/' into Windows '\'. */ 1132 for (i = 0; i < err; i++) { 1133 if (rp_name[i] == cpu_to_le16('/')) 1134 rp_name[i] = cpu_to_le16('\\'); 1135 } 1136 1137 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1138 rp->ReparseDataLength = 1139 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1140 SymbolicLinkReparseBuffer)); 1141 1142 /* PrintName + SubstituteName. */ 1143 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1144 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1145 rs->PrintNameLength = rs->SubstituteNameOffset; 1146 1147 /* 1148 * TODO: Use relative path if possible to allow Windows to 1149 * parse this path. 1150 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1151 */ 1152 rs->Flags = 0; 1153 1154 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1155 1156 /* Decorate SubstituteName. */ 1157 rp_name += err; 1158 rp_name[0] = cpu_to_le16('\\'); 1159 rp_name[1] = cpu_to_le16('?'); 1160 rp_name[2] = cpu_to_le16('?'); 1161 rp_name[3] = cpu_to_le16('\\'); 1162 1163 return rp; 1164 out: 1165 kfree(rp); 1166 return ERR_PTR(err); 1167 } 1168 1169 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns, 1170 struct inode *dir, struct dentry *dentry, 1171 const struct cpu_str *uni, umode_t mode, 1172 dev_t dev, const char *symname, u32 size, 1173 struct ntfs_fnd *fnd) 1174 { 1175 int err; 1176 struct super_block *sb = dir->i_sb; 1177 struct ntfs_sb_info *sbi = sb->s_fs_info; 1178 const struct qstr *name = &dentry->d_name; 1179 CLST ino = 0; 1180 struct ntfs_inode *dir_ni = ntfs_i(dir); 1181 struct ntfs_inode *ni = NULL; 1182 struct inode *inode = NULL; 1183 struct ATTRIB *attr; 1184 struct ATTR_STD_INFO5 *std5; 1185 struct ATTR_FILE_NAME *fname; 1186 struct MFT_REC *rec; 1187 u32 asize, dsize, sd_size; 1188 enum FILE_ATTRIBUTE fa; 1189 __le32 security_id = SECURITY_ID_INVALID; 1190 CLST vcn; 1191 const void *sd; 1192 u16 t16, nsize = 0, aid = 0; 1193 struct INDEX_ROOT *root, *dir_root; 1194 struct NTFS_DE *e, *new_de = NULL; 1195 struct REPARSE_DATA_BUFFER *rp = NULL; 1196 bool rp_inserted = false; 1197 1198 ni_lock_dir(dir_ni); 1199 1200 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1201 if (!dir_root) { 1202 err = -EINVAL; 1203 goto out1; 1204 } 1205 1206 if (S_ISDIR(mode)) { 1207 /* Use parent's directory attributes. */ 1208 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1209 FILE_ATTRIBUTE_ARCHIVE; 1210 /* 1211 * By default child directory inherits parent attributes. 1212 * Root directory is hidden + system. 1213 * Make an exception for children in root. 1214 */ 1215 if (dir->i_ino == MFT_REC_ROOT) 1216 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1217 } else if (S_ISLNK(mode)) { 1218 /* It is good idea that link should be the same type (file/dir) as target */ 1219 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1220 1221 /* 1222 * Linux: there are dir/file/symlink and so on. 1223 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1224 * It is good idea to create: 1225 * dir + reparse if 'symname' points to directory 1226 * or 1227 * file + reparse if 'symname' points to file 1228 * Unfortunately kern_path hangs if symname contains 'dir'. 1229 */ 1230 1231 /* 1232 * struct path path; 1233 * 1234 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1235 * struct inode *target = d_inode(path.dentry); 1236 * 1237 * if (S_ISDIR(target->i_mode)) 1238 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1239 * // if ( target->i_sb == sb ){ 1240 * // use relative path? 1241 * // } 1242 * path_put(&path); 1243 * } 1244 */ 1245 } else if (S_ISREG(mode)) { 1246 if (sbi->options->sparse) { 1247 /* Sparsed regular file, cause option 'sparse'. */ 1248 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1249 FILE_ATTRIBUTE_ARCHIVE; 1250 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1251 /* Compressed regular file, if parent is compressed. */ 1252 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1253 } else { 1254 /* Regular file, default attributes. */ 1255 fa = FILE_ATTRIBUTE_ARCHIVE; 1256 } 1257 } else { 1258 fa = FILE_ATTRIBUTE_ARCHIVE; 1259 } 1260 1261 if (!(mode & 0222)) 1262 fa |= FILE_ATTRIBUTE_READONLY; 1263 1264 /* Allocate PATH_MAX bytes. */ 1265 new_de = __getname(); 1266 if (!new_de) { 1267 err = -ENOMEM; 1268 goto out1; 1269 } 1270 1271 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1272 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1273 1274 /* Step 1: allocate and fill new mft record. */ 1275 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1276 if (err) 1277 goto out2; 1278 1279 ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY); 1280 if (IS_ERR(ni)) { 1281 err = PTR_ERR(ni); 1282 ni = NULL; 1283 goto out3; 1284 } 1285 inode = &ni->vfs_inode; 1286 inode_init_owner(mnt_userns, inode, dir, mode); 1287 mode = inode->i_mode; 1288 1289 inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime = 1290 current_time(inode); 1291 1292 rec = ni->mi.mrec; 1293 rec->hard_links = cpu_to_le16(1); 1294 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1295 1296 /* Get default security id. */ 1297 sd = s_default_security; 1298 sd_size = sizeof(s_default_security); 1299 1300 if (is_ntfs3(sbi)) { 1301 security_id = dir_ni->std_security_id; 1302 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1303 security_id = sbi->security.def_security_id; 1304 1305 if (security_id == SECURITY_ID_INVALID && 1306 !ntfs_insert_security(sbi, sd, sd_size, 1307 &security_id, NULL)) 1308 sbi->security.def_security_id = security_id; 1309 } 1310 } 1311 1312 /* Insert standard info. */ 1313 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1314 1315 if (security_id == SECURITY_ID_INVALID) { 1316 dsize = sizeof(struct ATTR_STD_INFO); 1317 } else { 1318 dsize = sizeof(struct ATTR_STD_INFO5); 1319 std5->security_id = security_id; 1320 ni->std_security_id = security_id; 1321 } 1322 asize = SIZEOF_RESIDENT + dsize; 1323 1324 attr->type = ATTR_STD; 1325 attr->size = cpu_to_le32(asize); 1326 attr->id = cpu_to_le16(aid++); 1327 attr->res.data_off = SIZEOF_RESIDENT_LE; 1328 attr->res.data_size = cpu_to_le32(dsize); 1329 1330 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1331 kernel2nt(&inode->i_atime); 1332 1333 ni->std_fa = fa; 1334 std5->fa = fa; 1335 1336 attr = Add2Ptr(attr, asize); 1337 1338 /* Insert file name. */ 1339 err = fill_name_de(sbi, new_de, name, uni); 1340 if (err) 1341 goto out4; 1342 1343 mi_get_ref(&ni->mi, &new_de->ref); 1344 1345 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1346 mi_get_ref(&dir_ni->mi, &fname->home); 1347 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1348 fname->dup.a_time = std5->cr_time; 1349 fname->dup.alloc_size = fname->dup.data_size = 0; 1350 fname->dup.fa = std5->fa; 1351 fname->dup.ea_size = fname->dup.reparse = 0; 1352 1353 dsize = le16_to_cpu(new_de->key_size); 1354 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1355 1356 attr->type = ATTR_NAME; 1357 attr->size = cpu_to_le32(asize); 1358 attr->res.data_off = SIZEOF_RESIDENT_LE; 1359 attr->res.flags = RESIDENT_FLAG_INDEXED; 1360 attr->id = cpu_to_le16(aid++); 1361 attr->res.data_size = cpu_to_le32(dsize); 1362 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1363 1364 attr = Add2Ptr(attr, asize); 1365 1366 if (security_id == SECURITY_ID_INVALID) { 1367 /* Insert security attribute. */ 1368 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1369 1370 attr->type = ATTR_SECURE; 1371 attr->size = cpu_to_le32(asize); 1372 attr->id = cpu_to_le16(aid++); 1373 attr->res.data_off = SIZEOF_RESIDENT_LE; 1374 attr->res.data_size = cpu_to_le32(sd_size); 1375 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1376 1377 attr = Add2Ptr(attr, asize); 1378 } 1379 1380 attr->id = cpu_to_le16(aid++); 1381 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1382 /* 1383 * Regular directory or symlink to directory. 1384 * Create root attribute. 1385 */ 1386 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1387 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1388 1389 attr->type = ATTR_ROOT; 1390 attr->size = cpu_to_le32(asize); 1391 1392 attr->name_len = ARRAY_SIZE(I30_NAME); 1393 attr->name_off = SIZEOF_RESIDENT_LE; 1394 attr->res.data_off = 1395 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1396 attr->res.data_size = cpu_to_le32(dsize); 1397 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1398 sizeof(I30_NAME)); 1399 1400 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1401 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1402 root->ihdr.de_off = 1403 cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10 1404 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1405 sizeof(struct NTFS_DE)); 1406 root->ihdr.total = root->ihdr.used; 1407 1408 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1409 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1410 e->flags = NTFS_IE_LAST; 1411 } else if (S_ISLNK(mode)) { 1412 /* 1413 * Symlink to file. 1414 * Create empty resident data attribute. 1415 */ 1416 asize = SIZEOF_RESIDENT; 1417 1418 /* Insert empty ATTR_DATA */ 1419 attr->type = ATTR_DATA; 1420 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1421 attr->name_off = SIZEOF_RESIDENT_LE; 1422 attr->res.data_off = SIZEOF_RESIDENT_LE; 1423 } else if (S_ISREG(mode)) { 1424 /* 1425 * Regular file. Create empty non resident data attribute. 1426 */ 1427 attr->type = ATTR_DATA; 1428 attr->non_res = 1; 1429 attr->nres.evcn = cpu_to_le64(-1ll); 1430 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1431 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1432 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1433 attr->flags = ATTR_FLAG_SPARSED; 1434 asize = SIZEOF_NONRESIDENT_EX + 8; 1435 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1436 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1437 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1438 attr->flags = ATTR_FLAG_COMPRESSED; 1439 attr->nres.c_unit = COMPRESSION_UNIT; 1440 asize = SIZEOF_NONRESIDENT_EX + 8; 1441 } else { 1442 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1443 attr->name_off = SIZEOF_NONRESIDENT_LE; 1444 asize = SIZEOF_NONRESIDENT + 8; 1445 } 1446 attr->nres.run_off = attr->name_off; 1447 } else { 1448 /* 1449 * Node. Create empty resident data attribute. 1450 */ 1451 attr->type = ATTR_DATA; 1452 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1453 attr->name_off = SIZEOF_RESIDENT_LE; 1454 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1455 attr->flags = ATTR_FLAG_SPARSED; 1456 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1457 attr->flags = ATTR_FLAG_COMPRESSED; 1458 attr->res.data_off = SIZEOF_RESIDENT_LE; 1459 asize = SIZEOF_RESIDENT; 1460 ni->ni_flags |= NI_FLAG_RESIDENT; 1461 } 1462 1463 if (S_ISDIR(mode)) { 1464 ni->ni_flags |= NI_FLAG_DIR; 1465 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1466 if (err) 1467 goto out4; 1468 } else if (S_ISLNK(mode)) { 1469 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1470 1471 if (IS_ERR(rp)) { 1472 err = PTR_ERR(rp); 1473 rp = NULL; 1474 goto out4; 1475 } 1476 1477 /* 1478 * Insert ATTR_REPARSE. 1479 */ 1480 attr = Add2Ptr(attr, asize); 1481 attr->type = ATTR_REPARSE; 1482 attr->id = cpu_to_le16(aid++); 1483 1484 /* Resident or non resident? */ 1485 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1486 t16 = PtrOffset(rec, attr); 1487 1488 /* 1489 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1490 * It is good idea to keep extened attributes resident. 1491 */ 1492 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1493 CLST alen; 1494 CLST clst = bytes_to_cluster(sbi, nsize); 1495 1496 /* Bytes per runs. */ 1497 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1498 1499 attr->non_res = 1; 1500 attr->nres.evcn = cpu_to_le64(clst - 1); 1501 attr->name_off = SIZEOF_NONRESIDENT_LE; 1502 attr->nres.run_off = attr->name_off; 1503 attr->nres.data_size = cpu_to_le64(nsize); 1504 attr->nres.valid_size = attr->nres.data_size; 1505 attr->nres.alloc_size = 1506 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1507 1508 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1509 clst, NULL, 0, &alen, 0, 1510 NULL); 1511 if (err) 1512 goto out5; 1513 1514 err = run_pack(&ni->file.run, 0, clst, 1515 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1516 &vcn); 1517 if (err < 0) 1518 goto out5; 1519 1520 if (vcn != clst) { 1521 err = -EINVAL; 1522 goto out5; 1523 } 1524 1525 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1526 } else { 1527 attr->res.data_off = SIZEOF_RESIDENT_LE; 1528 attr->res.data_size = cpu_to_le32(nsize); 1529 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1530 nsize = 0; 1531 } 1532 /* Size of symlink equals the length of input string. */ 1533 inode->i_size = size; 1534 1535 attr->size = cpu_to_le32(asize); 1536 1537 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1538 &new_de->ref); 1539 if (err) 1540 goto out5; 1541 1542 rp_inserted = true; 1543 } 1544 1545 attr = Add2Ptr(attr, asize); 1546 attr->type = ATTR_END; 1547 1548 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1549 rec->next_attr_id = cpu_to_le16(aid); 1550 1551 /* Step 2: Add new name in index. */ 1552 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1553 if (err) 1554 goto out6; 1555 1556 /* Unlock parent directory before ntfs_init_acl. */ 1557 ni_unlock(dir_ni); 1558 1559 inode->i_generation = le16_to_cpu(rec->seq); 1560 1561 dir->i_mtime = dir->i_ctime = inode->i_atime; 1562 1563 if (S_ISDIR(mode)) { 1564 inode->i_op = &ntfs_dir_inode_operations; 1565 inode->i_fop = &ntfs_dir_operations; 1566 } else if (S_ISLNK(mode)) { 1567 inode->i_op = &ntfs_link_inode_operations; 1568 inode->i_fop = NULL; 1569 inode->i_mapping->a_ops = &ntfs_aops; 1570 inode->i_size = size; 1571 inode_nohighmem(inode); 1572 } else if (S_ISREG(mode)) { 1573 inode->i_op = &ntfs_file_inode_operations; 1574 inode->i_fop = &ntfs_file_operations; 1575 inode->i_mapping->a_ops = 1576 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops; 1577 init_rwsem(&ni->file.run_lock); 1578 } else { 1579 inode->i_op = &ntfs_special_inode_operations; 1580 init_special_inode(inode, mode, dev); 1581 } 1582 1583 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1584 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1585 err = ntfs_init_acl(mnt_userns, inode, dir); 1586 if (err) 1587 goto out7; 1588 } else 1589 #endif 1590 { 1591 inode->i_flags |= S_NOSEC; 1592 } 1593 1594 /* Write non resident data. */ 1595 if (nsize) { 1596 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0); 1597 if (err) 1598 goto out7; 1599 } 1600 1601 /* 1602 * Call 'd_instantiate' after inode->i_op is set 1603 * but before finish_open. 1604 */ 1605 d_instantiate(dentry, inode); 1606 1607 ntfs_save_wsl_perm(inode); 1608 mark_inode_dirty(dir); 1609 mark_inode_dirty(inode); 1610 1611 /* Normal exit. */ 1612 goto out2; 1613 1614 out7: 1615 1616 /* Undo 'indx_insert_entry'. */ 1617 ni_lock_dir(dir_ni); 1618 indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1, 1619 le16_to_cpu(new_de->key_size), sbi); 1620 /* ni_unlock(dir_ni); will be called later. */ 1621 out6: 1622 if (rp_inserted) 1623 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1624 1625 out5: 1626 if (S_ISDIR(mode) || run_is_empty(&ni->file.run)) 1627 goto out4; 1628 1629 run_deallocate(sbi, &ni->file.run, false); 1630 1631 out4: 1632 clear_rec_inuse(rec); 1633 clear_nlink(inode); 1634 ni->mi.dirty = false; 1635 discard_new_inode(inode); 1636 out3: 1637 ntfs_mark_rec_free(sbi, ino); 1638 1639 out2: 1640 __putname(new_de); 1641 kfree(rp); 1642 1643 out1: 1644 if (err) { 1645 ni_unlock(dir_ni); 1646 return ERR_PTR(err); 1647 } 1648 1649 unlock_new_inode(inode); 1650 1651 return inode; 1652 } 1653 1654 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1655 { 1656 int err; 1657 struct ntfs_inode *ni = ntfs_i(inode); 1658 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1659 struct NTFS_DE *de; 1660 struct ATTR_FILE_NAME *de_name; 1661 1662 /* Allocate PATH_MAX bytes. */ 1663 de = __getname(); 1664 if (!de) 1665 return -ENOMEM; 1666 1667 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1668 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1669 1670 /* Construct 'de'. */ 1671 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1672 if (err) 1673 goto out; 1674 1675 de_name = (struct ATTR_FILE_NAME *)(de + 1); 1676 /* Fill duplicate info. */ 1677 de_name->dup.cr_time = de_name->dup.m_time = de_name->dup.c_time = 1678 de_name->dup.a_time = kernel2nt(&inode->i_ctime); 1679 de_name->dup.alloc_size = de_name->dup.data_size = 1680 cpu_to_le64(inode->i_size); 1681 de_name->dup.fa = ni->std_fa; 1682 de_name->dup.ea_size = de_name->dup.reparse = 0; 1683 1684 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1685 out: 1686 __putname(de); 1687 return err; 1688 } 1689 1690 /* 1691 * ntfs_unlink_inode 1692 * 1693 * inode_operations::unlink 1694 * inode_operations::rmdir 1695 */ 1696 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1697 { 1698 int err; 1699 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1700 struct inode *inode = d_inode(dentry); 1701 struct ntfs_inode *ni = ntfs_i(inode); 1702 struct ntfs_inode *dir_ni = ntfs_i(dir); 1703 struct NTFS_DE *de, *de2 = NULL; 1704 int undo_remove; 1705 1706 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1707 return -EINVAL; 1708 1709 /* Allocate PATH_MAX bytes. */ 1710 de = __getname(); 1711 if (!de) 1712 return -ENOMEM; 1713 1714 ni_lock(ni); 1715 1716 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1717 err = -ENOTEMPTY; 1718 goto out; 1719 } 1720 1721 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1722 if (err < 0) 1723 goto out; 1724 1725 undo_remove = 0; 1726 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1727 1728 if (!err) { 1729 drop_nlink(inode); 1730 dir->i_mtime = dir->i_ctime = current_time(dir); 1731 mark_inode_dirty(dir); 1732 inode->i_ctime = dir->i_ctime; 1733 if (inode->i_nlink) 1734 mark_inode_dirty(inode); 1735 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1736 make_bad_inode(inode); 1737 ntfs_inode_err(inode, "failed to undo unlink"); 1738 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 1739 } else { 1740 if (ni_is_dirty(dir)) 1741 mark_inode_dirty(dir); 1742 if (ni_is_dirty(inode)) 1743 mark_inode_dirty(inode); 1744 } 1745 1746 out: 1747 ni_unlock(ni); 1748 __putname(de); 1749 return err; 1750 } 1751 1752 void ntfs_evict_inode(struct inode *inode) 1753 { 1754 truncate_inode_pages_final(&inode->i_data); 1755 1756 if (inode->i_nlink) 1757 _ni_write_inode(inode, inode_needs_sync(inode)); 1758 1759 invalidate_inode_buffers(inode); 1760 clear_inode(inode); 1761 1762 ni_clear(ntfs_i(inode)); 1763 } 1764 1765 static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer, 1766 int buflen) 1767 { 1768 int i, err = -EINVAL; 1769 struct ntfs_inode *ni = ntfs_i(inode); 1770 struct super_block *sb = inode->i_sb; 1771 struct ntfs_sb_info *sbi = sb->s_fs_info; 1772 u64 size; 1773 u16 ulen = 0; 1774 void *to_free = NULL; 1775 struct REPARSE_DATA_BUFFER *rp; 1776 const __le16 *uname; 1777 struct ATTRIB *attr; 1778 1779 /* Reparse data present. Try to parse it. */ 1780 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1781 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1782 1783 *buffer = 0; 1784 1785 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1786 if (!attr) 1787 goto out; 1788 1789 if (!attr->non_res) { 1790 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1791 if (!rp) 1792 goto out; 1793 size = le32_to_cpu(attr->res.data_size); 1794 } else { 1795 size = le64_to_cpu(attr->nres.data_size); 1796 rp = NULL; 1797 } 1798 1799 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1800 goto out; 1801 1802 if (!rp) { 1803 rp = kmalloc(size, GFP_NOFS); 1804 if (!rp) { 1805 err = -ENOMEM; 1806 goto out; 1807 } 1808 to_free = rp; 1809 /* Read into temporal buffer. */ 1810 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1811 if (err) 1812 goto out; 1813 } 1814 1815 /* Microsoft Tag. */ 1816 switch (rp->ReparseTag) { 1817 case IO_REPARSE_TAG_MOUNT_POINT: 1818 /* Mount points and junctions. */ 1819 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1820 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1821 MountPointReparseBuffer.PathBuffer)) 1822 goto out; 1823 uname = Add2Ptr(rp, 1824 offsetof(struct REPARSE_DATA_BUFFER, 1825 MountPointReparseBuffer.PathBuffer) + 1826 le16_to_cpu(rp->MountPointReparseBuffer 1827 .PrintNameOffset)); 1828 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1829 break; 1830 1831 case IO_REPARSE_TAG_SYMLINK: 1832 /* FolderSymbolicLink */ 1833 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1834 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1835 SymbolicLinkReparseBuffer.PathBuffer)) 1836 goto out; 1837 uname = Add2Ptr( 1838 rp, offsetof(struct REPARSE_DATA_BUFFER, 1839 SymbolicLinkReparseBuffer.PathBuffer) + 1840 le16_to_cpu(rp->SymbolicLinkReparseBuffer 1841 .PrintNameOffset)); 1842 ulen = le16_to_cpu( 1843 rp->SymbolicLinkReparseBuffer.PrintNameLength); 1844 break; 1845 1846 case IO_REPARSE_TAG_CLOUD: 1847 case IO_REPARSE_TAG_CLOUD_1: 1848 case IO_REPARSE_TAG_CLOUD_2: 1849 case IO_REPARSE_TAG_CLOUD_3: 1850 case IO_REPARSE_TAG_CLOUD_4: 1851 case IO_REPARSE_TAG_CLOUD_5: 1852 case IO_REPARSE_TAG_CLOUD_6: 1853 case IO_REPARSE_TAG_CLOUD_7: 1854 case IO_REPARSE_TAG_CLOUD_8: 1855 case IO_REPARSE_TAG_CLOUD_9: 1856 case IO_REPARSE_TAG_CLOUD_A: 1857 case IO_REPARSE_TAG_CLOUD_B: 1858 case IO_REPARSE_TAG_CLOUD_C: 1859 case IO_REPARSE_TAG_CLOUD_D: 1860 case IO_REPARSE_TAG_CLOUD_E: 1861 case IO_REPARSE_TAG_CLOUD_F: 1862 err = sizeof("OneDrive") - 1; 1863 if (err > buflen) 1864 err = buflen; 1865 memcpy(buffer, "OneDrive", err); 1866 goto out; 1867 1868 default: 1869 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 1870 /* Unknown Microsoft Tag. */ 1871 goto out; 1872 } 1873 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 1874 size <= sizeof(struct REPARSE_POINT)) { 1875 goto out; 1876 } 1877 1878 /* Users tag. */ 1879 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 1880 ulen = le16_to_cpu(rp->ReparseDataLength) - 1881 sizeof(struct REPARSE_POINT); 1882 } 1883 1884 /* Convert nlen from bytes to UNICODE chars. */ 1885 ulen >>= 1; 1886 1887 /* Check that name is available. */ 1888 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 1889 goto out; 1890 1891 /* If name is already zero terminated then truncate it now. */ 1892 if (!uname[ulen - 1]) 1893 ulen -= 1; 1894 1895 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 1896 1897 if (err < 0) 1898 goto out; 1899 1900 /* Translate Windows '\' into Linux '/'. */ 1901 for (i = 0; i < err; i++) { 1902 if (buffer[i] == '\\') 1903 buffer[i] = '/'; 1904 } 1905 1906 /* Always set last zero. */ 1907 buffer[err] = 0; 1908 out: 1909 kfree(to_free); 1910 return err; 1911 } 1912 1913 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 1914 struct delayed_call *done) 1915 { 1916 int err; 1917 char *ret; 1918 1919 if (!de) 1920 return ERR_PTR(-ECHILD); 1921 1922 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 1923 if (!ret) 1924 return ERR_PTR(-ENOMEM); 1925 1926 err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE); 1927 if (err < 0) { 1928 kfree(ret); 1929 return ERR_PTR(err); 1930 } 1931 1932 set_delayed_call(done, kfree_link, ret); 1933 1934 return ret; 1935 } 1936 1937 // clang-format off 1938 const struct inode_operations ntfs_link_inode_operations = { 1939 .get_link = ntfs_get_link, 1940 .setattr = ntfs3_setattr, 1941 .listxattr = ntfs_listxattr, 1942 .permission = ntfs_permission, 1943 .get_acl = ntfs_get_acl, 1944 .set_acl = ntfs_set_acl, 1945 }; 1946 1947 const struct address_space_operations ntfs_aops = { 1948 .read_folio = ntfs_read_folio, 1949 .readahead = ntfs_readahead, 1950 .writepage = ntfs_writepage, 1951 .writepages = ntfs_writepages, 1952 .write_begin = ntfs_write_begin, 1953 .write_end = ntfs_write_end, 1954 .direct_IO = ntfs_direct_IO, 1955 .bmap = ntfs_bmap, 1956 .dirty_folio = block_dirty_folio, 1957 .invalidate_folio = block_invalidate_folio, 1958 }; 1959 1960 const struct address_space_operations ntfs_aops_cmpr = { 1961 .read_folio = ntfs_read_folio, 1962 .readahead = ntfs_readahead, 1963 }; 1964 // clang-format on 1965