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 ll_rw_block(REQ_OP_READ, 1, &bh); 634 wait_on_buffer(bh); 635 if (!buffer_uptodate(bh)) { 636 err = -EIO; 637 goto out; 638 } 639 zero_user_segment(page, off + voff, off + block_size); 640 } 641 } 642 643 if (bh->b_size > bytes) 644 bh->b_size = bytes; 645 646 #ifndef __LP64__ 647 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 648 static_assert(sizeof(size_t) < sizeof(loff_t)); 649 if (bytes > 0x40000000u) 650 bh->b_size = 0x40000000u; 651 } 652 #endif 653 654 return 0; 655 656 out: 657 return err; 658 } 659 660 int ntfs_get_block(struct inode *inode, sector_t vbn, 661 struct buffer_head *bh_result, int create) 662 { 663 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 664 bh_result, create, GET_BLOCK_GENERAL); 665 } 666 667 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 668 struct buffer_head *bh_result, int create) 669 { 670 return ntfs_get_block_vbo(inode, 671 (u64)vsn << inode->i_sb->s_blocksize_bits, 672 bh_result, create, GET_BLOCK_BMAP); 673 } 674 675 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 676 { 677 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 678 } 679 680 static int ntfs_read_folio(struct file *file, struct folio *folio) 681 { 682 struct page *page = &folio->page; 683 int err; 684 struct address_space *mapping = page->mapping; 685 struct inode *inode = mapping->host; 686 struct ntfs_inode *ni = ntfs_i(inode); 687 688 if (is_resident(ni)) { 689 ni_lock(ni); 690 err = attr_data_read_resident(ni, page); 691 ni_unlock(ni); 692 if (err != E_NTFS_NONRESIDENT) { 693 unlock_page(page); 694 return err; 695 } 696 } 697 698 if (is_compressed(ni)) { 699 ni_lock(ni); 700 err = ni_readpage_cmpr(ni, page); 701 ni_unlock(ni); 702 return err; 703 } 704 705 /* Normal + sparse files. */ 706 return mpage_read_folio(folio, ntfs_get_block); 707 } 708 709 static void ntfs_readahead(struct readahead_control *rac) 710 { 711 struct address_space *mapping = rac->mapping; 712 struct inode *inode = mapping->host; 713 struct ntfs_inode *ni = ntfs_i(inode); 714 u64 valid; 715 loff_t pos; 716 717 if (is_resident(ni)) { 718 /* No readahead for resident. */ 719 return; 720 } 721 722 if (is_compressed(ni)) { 723 /* No readahead for compressed. */ 724 return; 725 } 726 727 valid = ni->i_valid; 728 pos = readahead_pos(rac); 729 730 if (valid < i_size_read(inode) && pos <= valid && 731 valid < pos + readahead_length(rac)) { 732 /* Range cross 'valid'. Read it page by page. */ 733 return; 734 } 735 736 mpage_readahead(rac, ntfs_get_block); 737 } 738 739 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 740 struct buffer_head *bh_result, int create) 741 { 742 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 743 bh_result, create, GET_BLOCK_DIRECT_IO_R); 744 } 745 746 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 747 struct buffer_head *bh_result, int create) 748 { 749 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 750 bh_result, create, GET_BLOCK_DIRECT_IO_W); 751 } 752 753 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 754 { 755 struct file *file = iocb->ki_filp; 756 struct address_space *mapping = file->f_mapping; 757 struct inode *inode = mapping->host; 758 struct ntfs_inode *ni = ntfs_i(inode); 759 loff_t vbo = iocb->ki_pos; 760 loff_t end; 761 int wr = iov_iter_rw(iter) & WRITE; 762 size_t iter_count = iov_iter_count(iter); 763 loff_t valid; 764 ssize_t ret; 765 766 if (is_resident(ni)) { 767 /* Switch to buffered write. */ 768 ret = 0; 769 goto out; 770 } 771 772 ret = blockdev_direct_IO(iocb, inode, iter, 773 wr ? ntfs_get_block_direct_IO_W 774 : ntfs_get_block_direct_IO_R); 775 776 if (ret > 0) 777 end = vbo + ret; 778 else if (wr && ret == -EIOCBQUEUED) 779 end = vbo + iter_count; 780 else 781 goto out; 782 783 valid = ni->i_valid; 784 if (wr) { 785 if (end > valid && !S_ISBLK(inode->i_mode)) { 786 ni->i_valid = end; 787 mark_inode_dirty(inode); 788 } 789 } else if (vbo < valid && valid < end) { 790 /* Fix page. */ 791 iov_iter_revert(iter, end - valid); 792 iov_iter_zero(end - valid, iter); 793 } 794 795 out: 796 return ret; 797 } 798 799 int ntfs_set_size(struct inode *inode, u64 new_size) 800 { 801 struct super_block *sb = inode->i_sb; 802 struct ntfs_sb_info *sbi = sb->s_fs_info; 803 struct ntfs_inode *ni = ntfs_i(inode); 804 int err; 805 806 /* Check for maximum file size. */ 807 if (is_sparsed(ni) || is_compressed(ni)) { 808 if (new_size > sbi->maxbytes_sparse) { 809 err = -EFBIG; 810 goto out; 811 } 812 } else if (new_size > sbi->maxbytes) { 813 err = -EFBIG; 814 goto out; 815 } 816 817 ni_lock(ni); 818 down_write(&ni->file.run_lock); 819 820 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 821 &ni->i_valid, true, NULL); 822 823 up_write(&ni->file.run_lock); 824 ni_unlock(ni); 825 826 mark_inode_dirty(inode); 827 828 out: 829 return err; 830 } 831 832 static int ntfs_writepage(struct page *page, struct writeback_control *wbc) 833 { 834 struct address_space *mapping = page->mapping; 835 struct inode *inode = mapping->host; 836 struct ntfs_inode *ni = ntfs_i(inode); 837 int err; 838 839 if (is_resident(ni)) { 840 ni_lock(ni); 841 err = attr_data_write_resident(ni, page); 842 ni_unlock(ni); 843 if (err != E_NTFS_NONRESIDENT) { 844 unlock_page(page); 845 return err; 846 } 847 } 848 849 return block_write_full_page(page, ntfs_get_block, wbc); 850 } 851 852 static int ntfs_writepages(struct address_space *mapping, 853 struct writeback_control *wbc) 854 { 855 /* Redirect call to 'ntfs_writepage' for resident files. */ 856 if (is_resident(ntfs_i(mapping->host))) 857 return generic_writepages(mapping, wbc); 858 return mpage_writepages(mapping, wbc, ntfs_get_block); 859 } 860 861 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 862 struct buffer_head *bh_result, int create) 863 { 864 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 865 bh_result, create, GET_BLOCK_WRITE_BEGIN); 866 } 867 868 int ntfs_write_begin(struct file *file, struct address_space *mapping, 869 loff_t pos, u32 len, struct page **pagep, void **fsdata) 870 { 871 int err; 872 struct inode *inode = mapping->host; 873 struct ntfs_inode *ni = ntfs_i(inode); 874 875 *pagep = NULL; 876 if (is_resident(ni)) { 877 struct page *page = grab_cache_page_write_begin( 878 mapping, pos >> PAGE_SHIFT); 879 880 if (!page) { 881 err = -ENOMEM; 882 goto out; 883 } 884 885 ni_lock(ni); 886 err = attr_data_read_resident(ni, page); 887 ni_unlock(ni); 888 889 if (!err) { 890 *pagep = page; 891 goto out; 892 } 893 unlock_page(page); 894 put_page(page); 895 896 if (err != E_NTFS_NONRESIDENT) 897 goto out; 898 } 899 900 err = block_write_begin(mapping, pos, len, pagep, 901 ntfs_get_block_write_begin); 902 903 out: 904 return err; 905 } 906 907 /* 908 * ntfs_write_end - Address_space_operations::write_end. 909 */ 910 int ntfs_write_end(struct file *file, struct address_space *mapping, 911 loff_t pos, u32 len, u32 copied, struct page *page, 912 void *fsdata) 913 { 914 struct inode *inode = mapping->host; 915 struct ntfs_inode *ni = ntfs_i(inode); 916 u64 valid = ni->i_valid; 917 bool dirty = false; 918 int err; 919 920 if (is_resident(ni)) { 921 ni_lock(ni); 922 err = attr_data_write_resident(ni, page); 923 ni_unlock(ni); 924 if (!err) { 925 dirty = true; 926 /* Clear any buffers in page. */ 927 if (page_has_buffers(page)) { 928 struct buffer_head *head, *bh; 929 930 bh = head = page_buffers(page); 931 do { 932 clear_buffer_dirty(bh); 933 clear_buffer_mapped(bh); 934 set_buffer_uptodate(bh); 935 } while (head != (bh = bh->b_this_page)); 936 } 937 SetPageUptodate(page); 938 err = copied; 939 } 940 unlock_page(page); 941 put_page(page); 942 } else { 943 err = generic_write_end(file, mapping, pos, len, copied, page, 944 fsdata); 945 } 946 947 if (err >= 0) { 948 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 949 inode->i_ctime = inode->i_mtime = current_time(inode); 950 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 951 dirty = true; 952 } 953 954 if (valid != ni->i_valid) { 955 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 956 dirty = true; 957 } 958 959 if (dirty) 960 mark_inode_dirty(inode); 961 } 962 963 return err; 964 } 965 966 int reset_log_file(struct inode *inode) 967 { 968 int err; 969 loff_t pos = 0; 970 u32 log_size = inode->i_size; 971 struct address_space *mapping = inode->i_mapping; 972 973 for (;;) { 974 u32 len; 975 void *kaddr; 976 struct page *page; 977 978 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 979 980 err = block_write_begin(mapping, pos, len, &page, 981 ntfs_get_block_write_begin); 982 if (err) 983 goto out; 984 985 kaddr = kmap_atomic(page); 986 memset(kaddr, -1, len); 987 kunmap_atomic(kaddr); 988 flush_dcache_page(page); 989 990 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 991 if (err < 0) 992 goto out; 993 pos += len; 994 995 if (pos >= log_size) 996 break; 997 balance_dirty_pages_ratelimited(mapping); 998 } 999 out: 1000 mark_inode_dirty_sync(inode); 1001 1002 return err; 1003 } 1004 1005 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1006 { 1007 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1008 } 1009 1010 int ntfs_sync_inode(struct inode *inode) 1011 { 1012 return _ni_write_inode(inode, 1); 1013 } 1014 1015 /* 1016 * writeback_inode - Helper function for ntfs_flush_inodes(). 1017 * 1018 * This writes both the inode and the file data blocks, waiting 1019 * for in flight data blocks before the start of the call. It 1020 * does not wait for any io started during the call. 1021 */ 1022 static int writeback_inode(struct inode *inode) 1023 { 1024 int ret = sync_inode_metadata(inode, 0); 1025 1026 if (!ret) 1027 ret = filemap_fdatawrite(inode->i_mapping); 1028 return ret; 1029 } 1030 1031 /* 1032 * ntfs_flush_inodes 1033 * 1034 * Write data and metadata corresponding to i1 and i2. The io is 1035 * started but we do not wait for any of it to finish. 1036 * 1037 * filemap_flush() is used for the block device, so if there is a dirty 1038 * page for a block already in flight, we will not wait and start the 1039 * io over again. 1040 */ 1041 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1042 struct inode *i2) 1043 { 1044 int ret = 0; 1045 1046 if (i1) 1047 ret = writeback_inode(i1); 1048 if (!ret && i2) 1049 ret = writeback_inode(i2); 1050 if (!ret) 1051 ret = sync_blockdev_nowait(sb->s_bdev); 1052 return ret; 1053 } 1054 1055 int inode_write_data(struct inode *inode, const void *data, size_t bytes) 1056 { 1057 pgoff_t idx; 1058 1059 /* Write non resident data. */ 1060 for (idx = 0; bytes; idx++) { 1061 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1062 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1063 1064 if (IS_ERR(page)) 1065 return PTR_ERR(page); 1066 1067 lock_page(page); 1068 WARN_ON(!PageUptodate(page)); 1069 ClearPageUptodate(page); 1070 1071 memcpy(page_address(page), data, op); 1072 1073 flush_dcache_page(page); 1074 SetPageUptodate(page); 1075 unlock_page(page); 1076 1077 ntfs_unmap_page(page); 1078 1079 bytes -= op; 1080 data = Add2Ptr(data, PAGE_SIZE); 1081 } 1082 return 0; 1083 } 1084 1085 /* 1086 * ntfs_reparse_bytes 1087 * 1088 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1089 * for unicode string of @uni_len length. 1090 */ 1091 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1092 { 1093 /* Header + unicode string + decorated unicode string. */ 1094 return sizeof(short) * (2 * uni_len + 4) + 1095 offsetof(struct REPARSE_DATA_BUFFER, 1096 SymbolicLinkReparseBuffer.PathBuffer); 1097 } 1098 1099 static struct REPARSE_DATA_BUFFER * 1100 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1101 u32 size, u16 *nsize) 1102 { 1103 int i, err; 1104 struct REPARSE_DATA_BUFFER *rp; 1105 __le16 *rp_name; 1106 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1107 1108 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1109 if (!rp) 1110 return ERR_PTR(-ENOMEM); 1111 1112 rs = &rp->SymbolicLinkReparseBuffer; 1113 rp_name = rs->PathBuffer; 1114 1115 /* Convert link name to UTF-16. */ 1116 err = ntfs_nls_to_utf16(sbi, symname, size, 1117 (struct cpu_str *)(rp_name - 1), 2 * size, 1118 UTF16_LITTLE_ENDIAN); 1119 if (err < 0) 1120 goto out; 1121 1122 /* err = the length of unicode name of symlink. */ 1123 *nsize = ntfs_reparse_bytes(err); 1124 1125 if (*nsize > sbi->reparse.max_size) { 1126 err = -EFBIG; 1127 goto out; 1128 } 1129 1130 /* Translate Linux '/' into Windows '\'. */ 1131 for (i = 0; i < err; i++) { 1132 if (rp_name[i] == cpu_to_le16('/')) 1133 rp_name[i] = cpu_to_le16('\\'); 1134 } 1135 1136 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1137 rp->ReparseDataLength = 1138 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1139 SymbolicLinkReparseBuffer)); 1140 1141 /* PrintName + SubstituteName. */ 1142 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1143 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1144 rs->PrintNameLength = rs->SubstituteNameOffset; 1145 1146 /* 1147 * TODO: Use relative path if possible to allow Windows to 1148 * parse this path. 1149 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1150 */ 1151 rs->Flags = 0; 1152 1153 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1154 1155 /* Decorate SubstituteName. */ 1156 rp_name += err; 1157 rp_name[0] = cpu_to_le16('\\'); 1158 rp_name[1] = cpu_to_le16('?'); 1159 rp_name[2] = cpu_to_le16('?'); 1160 rp_name[3] = cpu_to_le16('\\'); 1161 1162 return rp; 1163 out: 1164 kfree(rp); 1165 return ERR_PTR(err); 1166 } 1167 1168 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns, 1169 struct inode *dir, struct dentry *dentry, 1170 const struct cpu_str *uni, umode_t mode, 1171 dev_t dev, const char *symname, u32 size, 1172 struct ntfs_fnd *fnd) 1173 { 1174 int err; 1175 struct super_block *sb = dir->i_sb; 1176 struct ntfs_sb_info *sbi = sb->s_fs_info; 1177 const struct qstr *name = &dentry->d_name; 1178 CLST ino = 0; 1179 struct ntfs_inode *dir_ni = ntfs_i(dir); 1180 struct ntfs_inode *ni = NULL; 1181 struct inode *inode = NULL; 1182 struct ATTRIB *attr; 1183 struct ATTR_STD_INFO5 *std5; 1184 struct ATTR_FILE_NAME *fname; 1185 struct MFT_REC *rec; 1186 u32 asize, dsize, sd_size; 1187 enum FILE_ATTRIBUTE fa; 1188 __le32 security_id = SECURITY_ID_INVALID; 1189 CLST vcn; 1190 const void *sd; 1191 u16 t16, nsize = 0, aid = 0; 1192 struct INDEX_ROOT *root, *dir_root; 1193 struct NTFS_DE *e, *new_de = NULL; 1194 struct REPARSE_DATA_BUFFER *rp = NULL; 1195 bool rp_inserted = false; 1196 1197 ni_lock_dir(dir_ni); 1198 1199 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1200 if (!dir_root) { 1201 err = -EINVAL; 1202 goto out1; 1203 } 1204 1205 if (S_ISDIR(mode)) { 1206 /* Use parent's directory attributes. */ 1207 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1208 FILE_ATTRIBUTE_ARCHIVE; 1209 /* 1210 * By default child directory inherits parent attributes. 1211 * Root directory is hidden + system. 1212 * Make an exception for children in root. 1213 */ 1214 if (dir->i_ino == MFT_REC_ROOT) 1215 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1216 } else if (S_ISLNK(mode)) { 1217 /* It is good idea that link should be the same type (file/dir) as target */ 1218 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1219 1220 /* 1221 * Linux: there are dir/file/symlink and so on. 1222 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1223 * It is good idea to create: 1224 * dir + reparse if 'symname' points to directory 1225 * or 1226 * file + reparse if 'symname' points to file 1227 * Unfortunately kern_path hangs if symname contains 'dir'. 1228 */ 1229 1230 /* 1231 * struct path path; 1232 * 1233 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1234 * struct inode *target = d_inode(path.dentry); 1235 * 1236 * if (S_ISDIR(target->i_mode)) 1237 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1238 * // if ( target->i_sb == sb ){ 1239 * // use relative path? 1240 * // } 1241 * path_put(&path); 1242 * } 1243 */ 1244 } else if (S_ISREG(mode)) { 1245 if (sbi->options->sparse) { 1246 /* Sparsed regular file, cause option 'sparse'. */ 1247 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1248 FILE_ATTRIBUTE_ARCHIVE; 1249 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1250 /* Compressed regular file, if parent is compressed. */ 1251 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1252 } else { 1253 /* Regular file, default attributes. */ 1254 fa = FILE_ATTRIBUTE_ARCHIVE; 1255 } 1256 } else { 1257 fa = FILE_ATTRIBUTE_ARCHIVE; 1258 } 1259 1260 if (!(mode & 0222)) 1261 fa |= FILE_ATTRIBUTE_READONLY; 1262 1263 /* Allocate PATH_MAX bytes. */ 1264 new_de = __getname(); 1265 if (!new_de) { 1266 err = -ENOMEM; 1267 goto out1; 1268 } 1269 1270 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1271 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1272 1273 /* Step 1: allocate and fill new mft record. */ 1274 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1275 if (err) 1276 goto out2; 1277 1278 ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY); 1279 if (IS_ERR(ni)) { 1280 err = PTR_ERR(ni); 1281 ni = NULL; 1282 goto out3; 1283 } 1284 inode = &ni->vfs_inode; 1285 inode_init_owner(mnt_userns, inode, dir, mode); 1286 mode = inode->i_mode; 1287 1288 inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime = 1289 current_time(inode); 1290 1291 rec = ni->mi.mrec; 1292 rec->hard_links = cpu_to_le16(1); 1293 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1294 1295 /* Get default security id. */ 1296 sd = s_default_security; 1297 sd_size = sizeof(s_default_security); 1298 1299 if (is_ntfs3(sbi)) { 1300 security_id = dir_ni->std_security_id; 1301 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1302 security_id = sbi->security.def_security_id; 1303 1304 if (security_id == SECURITY_ID_INVALID && 1305 !ntfs_insert_security(sbi, sd, sd_size, 1306 &security_id, NULL)) 1307 sbi->security.def_security_id = security_id; 1308 } 1309 } 1310 1311 /* Insert standard info. */ 1312 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1313 1314 if (security_id == SECURITY_ID_INVALID) { 1315 dsize = sizeof(struct ATTR_STD_INFO); 1316 } else { 1317 dsize = sizeof(struct ATTR_STD_INFO5); 1318 std5->security_id = security_id; 1319 ni->std_security_id = security_id; 1320 } 1321 asize = SIZEOF_RESIDENT + dsize; 1322 1323 attr->type = ATTR_STD; 1324 attr->size = cpu_to_le32(asize); 1325 attr->id = cpu_to_le16(aid++); 1326 attr->res.data_off = SIZEOF_RESIDENT_LE; 1327 attr->res.data_size = cpu_to_le32(dsize); 1328 1329 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1330 kernel2nt(&inode->i_atime); 1331 1332 ni->std_fa = fa; 1333 std5->fa = fa; 1334 1335 attr = Add2Ptr(attr, asize); 1336 1337 /* Insert file name. */ 1338 err = fill_name_de(sbi, new_de, name, uni); 1339 if (err) 1340 goto out4; 1341 1342 mi_get_ref(&ni->mi, &new_de->ref); 1343 1344 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1345 mi_get_ref(&dir_ni->mi, &fname->home); 1346 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1347 fname->dup.a_time = std5->cr_time; 1348 fname->dup.alloc_size = fname->dup.data_size = 0; 1349 fname->dup.fa = std5->fa; 1350 fname->dup.ea_size = fname->dup.reparse = 0; 1351 1352 dsize = le16_to_cpu(new_de->key_size); 1353 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1354 1355 attr->type = ATTR_NAME; 1356 attr->size = cpu_to_le32(asize); 1357 attr->res.data_off = SIZEOF_RESIDENT_LE; 1358 attr->res.flags = RESIDENT_FLAG_INDEXED; 1359 attr->id = cpu_to_le16(aid++); 1360 attr->res.data_size = cpu_to_le32(dsize); 1361 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1362 1363 attr = Add2Ptr(attr, asize); 1364 1365 if (security_id == SECURITY_ID_INVALID) { 1366 /* Insert security attribute. */ 1367 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1368 1369 attr->type = ATTR_SECURE; 1370 attr->size = cpu_to_le32(asize); 1371 attr->id = cpu_to_le16(aid++); 1372 attr->res.data_off = SIZEOF_RESIDENT_LE; 1373 attr->res.data_size = cpu_to_le32(sd_size); 1374 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1375 1376 attr = Add2Ptr(attr, asize); 1377 } 1378 1379 attr->id = cpu_to_le16(aid++); 1380 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1381 /* 1382 * Regular directory or symlink to directory. 1383 * Create root attribute. 1384 */ 1385 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1386 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1387 1388 attr->type = ATTR_ROOT; 1389 attr->size = cpu_to_le32(asize); 1390 1391 attr->name_len = ARRAY_SIZE(I30_NAME); 1392 attr->name_off = SIZEOF_RESIDENT_LE; 1393 attr->res.data_off = 1394 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1395 attr->res.data_size = cpu_to_le32(dsize); 1396 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1397 sizeof(I30_NAME)); 1398 1399 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1400 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1401 root->ihdr.de_off = 1402 cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10 1403 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1404 sizeof(struct NTFS_DE)); 1405 root->ihdr.total = root->ihdr.used; 1406 1407 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1408 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1409 e->flags = NTFS_IE_LAST; 1410 } else if (S_ISLNK(mode)) { 1411 /* 1412 * Symlink to file. 1413 * Create empty resident data attribute. 1414 */ 1415 asize = SIZEOF_RESIDENT; 1416 1417 /* Insert empty ATTR_DATA */ 1418 attr->type = ATTR_DATA; 1419 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1420 attr->name_off = SIZEOF_RESIDENT_LE; 1421 attr->res.data_off = SIZEOF_RESIDENT_LE; 1422 } else if (S_ISREG(mode)) { 1423 /* 1424 * Regular file. Create empty non resident data attribute. 1425 */ 1426 attr->type = ATTR_DATA; 1427 attr->non_res = 1; 1428 attr->nres.evcn = cpu_to_le64(-1ll); 1429 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1430 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1431 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1432 attr->flags = ATTR_FLAG_SPARSED; 1433 asize = SIZEOF_NONRESIDENT_EX + 8; 1434 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1435 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1436 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1437 attr->flags = ATTR_FLAG_COMPRESSED; 1438 attr->nres.c_unit = COMPRESSION_UNIT; 1439 asize = SIZEOF_NONRESIDENT_EX + 8; 1440 } else { 1441 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1442 attr->name_off = SIZEOF_NONRESIDENT_LE; 1443 asize = SIZEOF_NONRESIDENT + 8; 1444 } 1445 attr->nres.run_off = attr->name_off; 1446 } else { 1447 /* 1448 * Node. Create empty resident data attribute. 1449 */ 1450 attr->type = ATTR_DATA; 1451 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1452 attr->name_off = SIZEOF_RESIDENT_LE; 1453 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1454 attr->flags = ATTR_FLAG_SPARSED; 1455 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1456 attr->flags = ATTR_FLAG_COMPRESSED; 1457 attr->res.data_off = SIZEOF_RESIDENT_LE; 1458 asize = SIZEOF_RESIDENT; 1459 ni->ni_flags |= NI_FLAG_RESIDENT; 1460 } 1461 1462 if (S_ISDIR(mode)) { 1463 ni->ni_flags |= NI_FLAG_DIR; 1464 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1465 if (err) 1466 goto out4; 1467 } else if (S_ISLNK(mode)) { 1468 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1469 1470 if (IS_ERR(rp)) { 1471 err = PTR_ERR(rp); 1472 rp = NULL; 1473 goto out4; 1474 } 1475 1476 /* 1477 * Insert ATTR_REPARSE. 1478 */ 1479 attr = Add2Ptr(attr, asize); 1480 attr->type = ATTR_REPARSE; 1481 attr->id = cpu_to_le16(aid++); 1482 1483 /* Resident or non resident? */ 1484 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1485 t16 = PtrOffset(rec, attr); 1486 1487 /* 1488 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1489 * It is good idea to keep extened attributes resident. 1490 */ 1491 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1492 CLST alen; 1493 CLST clst = bytes_to_cluster(sbi, nsize); 1494 1495 /* Bytes per runs. */ 1496 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1497 1498 attr->non_res = 1; 1499 attr->nres.evcn = cpu_to_le64(clst - 1); 1500 attr->name_off = SIZEOF_NONRESIDENT_LE; 1501 attr->nres.run_off = attr->name_off; 1502 attr->nres.data_size = cpu_to_le64(nsize); 1503 attr->nres.valid_size = attr->nres.data_size; 1504 attr->nres.alloc_size = 1505 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1506 1507 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1508 clst, NULL, 0, &alen, 0, 1509 NULL); 1510 if (err) 1511 goto out5; 1512 1513 err = run_pack(&ni->file.run, 0, clst, 1514 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1515 &vcn); 1516 if (err < 0) 1517 goto out5; 1518 1519 if (vcn != clst) { 1520 err = -EINVAL; 1521 goto out5; 1522 } 1523 1524 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1525 } else { 1526 attr->res.data_off = SIZEOF_RESIDENT_LE; 1527 attr->res.data_size = cpu_to_le32(nsize); 1528 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1529 nsize = 0; 1530 } 1531 /* Size of symlink equals the length of input string. */ 1532 inode->i_size = size; 1533 1534 attr->size = cpu_to_le32(asize); 1535 1536 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1537 &new_de->ref); 1538 if (err) 1539 goto out5; 1540 1541 rp_inserted = true; 1542 } 1543 1544 attr = Add2Ptr(attr, asize); 1545 attr->type = ATTR_END; 1546 1547 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1548 rec->next_attr_id = cpu_to_le16(aid); 1549 1550 /* Step 2: Add new name in index. */ 1551 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1552 if (err) 1553 goto out6; 1554 1555 /* Unlock parent directory before ntfs_init_acl. */ 1556 ni_unlock(dir_ni); 1557 1558 inode->i_generation = le16_to_cpu(rec->seq); 1559 1560 dir->i_mtime = dir->i_ctime = inode->i_atime; 1561 1562 if (S_ISDIR(mode)) { 1563 inode->i_op = &ntfs_dir_inode_operations; 1564 inode->i_fop = &ntfs_dir_operations; 1565 } else if (S_ISLNK(mode)) { 1566 inode->i_op = &ntfs_link_inode_operations; 1567 inode->i_fop = NULL; 1568 inode->i_mapping->a_ops = &ntfs_aops; 1569 inode->i_size = size; 1570 inode_nohighmem(inode); 1571 } else if (S_ISREG(mode)) { 1572 inode->i_op = &ntfs_file_inode_operations; 1573 inode->i_fop = &ntfs_file_operations; 1574 inode->i_mapping->a_ops = 1575 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops; 1576 init_rwsem(&ni->file.run_lock); 1577 } else { 1578 inode->i_op = &ntfs_special_inode_operations; 1579 init_special_inode(inode, mode, dev); 1580 } 1581 1582 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1583 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1584 err = ntfs_init_acl(mnt_userns, inode, dir); 1585 if (err) 1586 goto out7; 1587 } else 1588 #endif 1589 { 1590 inode->i_flags |= S_NOSEC; 1591 } 1592 1593 /* Write non resident data. */ 1594 if (nsize) { 1595 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize, 0); 1596 if (err) 1597 goto out7; 1598 } 1599 1600 /* 1601 * Call 'd_instantiate' after inode->i_op is set 1602 * but before finish_open. 1603 */ 1604 d_instantiate(dentry, inode); 1605 1606 ntfs_save_wsl_perm(inode); 1607 mark_inode_dirty(dir); 1608 mark_inode_dirty(inode); 1609 1610 /* Normal exit. */ 1611 goto out2; 1612 1613 out7: 1614 1615 /* Undo 'indx_insert_entry'. */ 1616 ni_lock_dir(dir_ni); 1617 indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1, 1618 le16_to_cpu(new_de->key_size), sbi); 1619 /* ni_unlock(dir_ni); will be called later. */ 1620 out6: 1621 if (rp_inserted) 1622 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1623 1624 out5: 1625 if (S_ISDIR(mode) || run_is_empty(&ni->file.run)) 1626 goto out4; 1627 1628 run_deallocate(sbi, &ni->file.run, false); 1629 1630 out4: 1631 clear_rec_inuse(rec); 1632 clear_nlink(inode); 1633 ni->mi.dirty = false; 1634 discard_new_inode(inode); 1635 out3: 1636 ntfs_mark_rec_free(sbi, ino, false); 1637 1638 out2: 1639 __putname(new_de); 1640 kfree(rp); 1641 1642 out1: 1643 if (err) { 1644 ni_unlock(dir_ni); 1645 return ERR_PTR(err); 1646 } 1647 1648 unlock_new_inode(inode); 1649 1650 return inode; 1651 } 1652 1653 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1654 { 1655 int err; 1656 struct ntfs_inode *ni = ntfs_i(inode); 1657 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1658 struct NTFS_DE *de; 1659 1660 /* Allocate PATH_MAX bytes. */ 1661 de = __getname(); 1662 if (!de) 1663 return -ENOMEM; 1664 1665 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1666 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1667 1668 /* Construct 'de'. */ 1669 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1670 if (err) 1671 goto out; 1672 1673 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1674 out: 1675 __putname(de); 1676 return err; 1677 } 1678 1679 /* 1680 * ntfs_unlink_inode 1681 * 1682 * inode_operations::unlink 1683 * inode_operations::rmdir 1684 */ 1685 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1686 { 1687 int err; 1688 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1689 struct inode *inode = d_inode(dentry); 1690 struct ntfs_inode *ni = ntfs_i(inode); 1691 struct ntfs_inode *dir_ni = ntfs_i(dir); 1692 struct NTFS_DE *de, *de2 = NULL; 1693 int undo_remove; 1694 1695 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1696 return -EINVAL; 1697 1698 /* Allocate PATH_MAX bytes. */ 1699 de = __getname(); 1700 if (!de) 1701 return -ENOMEM; 1702 1703 ni_lock(ni); 1704 1705 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1706 err = -ENOTEMPTY; 1707 goto out; 1708 } 1709 1710 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1711 if (err < 0) 1712 goto out; 1713 1714 undo_remove = 0; 1715 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1716 1717 if (!err) { 1718 drop_nlink(inode); 1719 dir->i_mtime = dir->i_ctime = current_time(dir); 1720 mark_inode_dirty(dir); 1721 inode->i_ctime = dir->i_ctime; 1722 if (inode->i_nlink) 1723 mark_inode_dirty(inode); 1724 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1725 _ntfs_bad_inode(inode); 1726 } else { 1727 if (ni_is_dirty(dir)) 1728 mark_inode_dirty(dir); 1729 if (ni_is_dirty(inode)) 1730 mark_inode_dirty(inode); 1731 } 1732 1733 out: 1734 ni_unlock(ni); 1735 __putname(de); 1736 return err; 1737 } 1738 1739 void ntfs_evict_inode(struct inode *inode) 1740 { 1741 truncate_inode_pages_final(&inode->i_data); 1742 1743 if (inode->i_nlink) 1744 _ni_write_inode(inode, inode_needs_sync(inode)); 1745 1746 invalidate_inode_buffers(inode); 1747 clear_inode(inode); 1748 1749 ni_clear(ntfs_i(inode)); 1750 } 1751 1752 static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer, 1753 int buflen) 1754 { 1755 int i, err = -EINVAL; 1756 struct ntfs_inode *ni = ntfs_i(inode); 1757 struct super_block *sb = inode->i_sb; 1758 struct ntfs_sb_info *sbi = sb->s_fs_info; 1759 u64 size; 1760 u16 ulen = 0; 1761 void *to_free = NULL; 1762 struct REPARSE_DATA_BUFFER *rp; 1763 const __le16 *uname; 1764 struct ATTRIB *attr; 1765 1766 /* Reparse data present. Try to parse it. */ 1767 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1768 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1769 1770 *buffer = 0; 1771 1772 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1773 if (!attr) 1774 goto out; 1775 1776 if (!attr->non_res) { 1777 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1778 if (!rp) 1779 goto out; 1780 size = le32_to_cpu(attr->res.data_size); 1781 } else { 1782 size = le64_to_cpu(attr->nres.data_size); 1783 rp = NULL; 1784 } 1785 1786 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1787 goto out; 1788 1789 if (!rp) { 1790 rp = kmalloc(size, GFP_NOFS); 1791 if (!rp) { 1792 err = -ENOMEM; 1793 goto out; 1794 } 1795 to_free = rp; 1796 /* Read into temporal buffer. */ 1797 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1798 if (err) 1799 goto out; 1800 } 1801 1802 /* Microsoft Tag. */ 1803 switch (rp->ReparseTag) { 1804 case IO_REPARSE_TAG_MOUNT_POINT: 1805 /* Mount points and junctions. */ 1806 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1807 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1808 MountPointReparseBuffer.PathBuffer)) 1809 goto out; 1810 uname = Add2Ptr(rp, 1811 offsetof(struct REPARSE_DATA_BUFFER, 1812 MountPointReparseBuffer.PathBuffer) + 1813 le16_to_cpu(rp->MountPointReparseBuffer 1814 .PrintNameOffset)); 1815 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1816 break; 1817 1818 case IO_REPARSE_TAG_SYMLINK: 1819 /* FolderSymbolicLink */ 1820 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1821 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1822 SymbolicLinkReparseBuffer.PathBuffer)) 1823 goto out; 1824 uname = Add2Ptr( 1825 rp, offsetof(struct REPARSE_DATA_BUFFER, 1826 SymbolicLinkReparseBuffer.PathBuffer) + 1827 le16_to_cpu(rp->SymbolicLinkReparseBuffer 1828 .PrintNameOffset)); 1829 ulen = le16_to_cpu( 1830 rp->SymbolicLinkReparseBuffer.PrintNameLength); 1831 break; 1832 1833 case IO_REPARSE_TAG_CLOUD: 1834 case IO_REPARSE_TAG_CLOUD_1: 1835 case IO_REPARSE_TAG_CLOUD_2: 1836 case IO_REPARSE_TAG_CLOUD_3: 1837 case IO_REPARSE_TAG_CLOUD_4: 1838 case IO_REPARSE_TAG_CLOUD_5: 1839 case IO_REPARSE_TAG_CLOUD_6: 1840 case IO_REPARSE_TAG_CLOUD_7: 1841 case IO_REPARSE_TAG_CLOUD_8: 1842 case IO_REPARSE_TAG_CLOUD_9: 1843 case IO_REPARSE_TAG_CLOUD_A: 1844 case IO_REPARSE_TAG_CLOUD_B: 1845 case IO_REPARSE_TAG_CLOUD_C: 1846 case IO_REPARSE_TAG_CLOUD_D: 1847 case IO_REPARSE_TAG_CLOUD_E: 1848 case IO_REPARSE_TAG_CLOUD_F: 1849 err = sizeof("OneDrive") - 1; 1850 if (err > buflen) 1851 err = buflen; 1852 memcpy(buffer, "OneDrive", err); 1853 goto out; 1854 1855 default: 1856 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 1857 /* Unknown Microsoft Tag. */ 1858 goto out; 1859 } 1860 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 1861 size <= sizeof(struct REPARSE_POINT)) { 1862 goto out; 1863 } 1864 1865 /* Users tag. */ 1866 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 1867 ulen = le16_to_cpu(rp->ReparseDataLength) - 1868 sizeof(struct REPARSE_POINT); 1869 } 1870 1871 /* Convert nlen from bytes to UNICODE chars. */ 1872 ulen >>= 1; 1873 1874 /* Check that name is available. */ 1875 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 1876 goto out; 1877 1878 /* If name is already zero terminated then truncate it now. */ 1879 if (!uname[ulen - 1]) 1880 ulen -= 1; 1881 1882 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 1883 1884 if (err < 0) 1885 goto out; 1886 1887 /* Translate Windows '\' into Linux '/'. */ 1888 for (i = 0; i < err; i++) { 1889 if (buffer[i] == '\\') 1890 buffer[i] = '/'; 1891 } 1892 1893 /* Always set last zero. */ 1894 buffer[err] = 0; 1895 out: 1896 kfree(to_free); 1897 return err; 1898 } 1899 1900 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 1901 struct delayed_call *done) 1902 { 1903 int err; 1904 char *ret; 1905 1906 if (!de) 1907 return ERR_PTR(-ECHILD); 1908 1909 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 1910 if (!ret) 1911 return ERR_PTR(-ENOMEM); 1912 1913 err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE); 1914 if (err < 0) { 1915 kfree(ret); 1916 return ERR_PTR(err); 1917 } 1918 1919 set_delayed_call(done, kfree_link, ret); 1920 1921 return ret; 1922 } 1923 1924 // clang-format off 1925 const struct inode_operations ntfs_link_inode_operations = { 1926 .get_link = ntfs_get_link, 1927 .setattr = ntfs3_setattr, 1928 .listxattr = ntfs_listxattr, 1929 .permission = ntfs_permission, 1930 .get_acl = ntfs_get_acl, 1931 .set_acl = ntfs_set_acl, 1932 }; 1933 1934 const struct address_space_operations ntfs_aops = { 1935 .read_folio = ntfs_read_folio, 1936 .readahead = ntfs_readahead, 1937 .writepage = ntfs_writepage, 1938 .writepages = ntfs_writepages, 1939 .write_begin = ntfs_write_begin, 1940 .write_end = ntfs_write_end, 1941 .direct_IO = ntfs_direct_IO, 1942 .bmap = ntfs_bmap, 1943 .dirty_folio = block_dirty_folio, 1944 .invalidate_folio = block_invalidate_folio, 1945 }; 1946 1947 const struct address_space_operations ntfs_aops_cmpr = { 1948 .read_folio = ntfs_read_folio, 1949 .readahead = ntfs_readahead, 1950 }; 1951 // clang-format on 1952