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 parse 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, links = 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 struct timespec64 ts; 48 49 inode->i_op = NULL; 50 /* Setup 'uid' and 'gid' */ 51 inode->i_uid = sbi->options->fs_uid; 52 inode->i_gid = sbi->options->fs_gid; 53 54 err = mi_init(&ni->mi, sbi, ino); 55 if (err) 56 goto out; 57 58 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) { 59 t64 = sbi->mft.lbo >> sbi->cluster_bits; 60 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size); 61 sbi->mft.ni = ni; 62 init_rwsem(&ni->file.run_lock); 63 64 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) { 65 err = -ENOMEM; 66 goto out; 67 } 68 } 69 70 err = mi_read(&ni->mi, ino == MFT_REC_MFT); 71 72 if (err) 73 goto out; 74 75 rec = ni->mi.mrec; 76 77 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) { 78 ; 79 } else if (ref->seq != rec->seq) { 80 err = -EINVAL; 81 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino, 82 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq)); 83 goto out; 84 } else if (!is_rec_inuse(rec)) { 85 err = -ESTALE; 86 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino); 87 goto out; 88 } 89 90 if (le32_to_cpu(rec->total) != sbi->record_size) { 91 /* Bad inode? */ 92 err = -EINVAL; 93 goto out; 94 } 95 96 if (!is_rec_base(rec)) { 97 err = -EINVAL; 98 goto out; 99 } 100 101 /* Record should contain $I30 root. */ 102 is_dir = rec->flags & RECORD_FLAG_DIR; 103 104 /* MFT_REC_MFT is not a dir */ 105 if (is_dir && ino == MFT_REC_MFT) { 106 err = -EINVAL; 107 goto out; 108 } 109 110 inode->i_generation = le16_to_cpu(rec->seq); 111 112 /* Enumerate all struct Attributes MFT. */ 113 le = NULL; 114 attr = NULL; 115 116 /* 117 * To reduce tab pressure use goto instead of 118 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) )) 119 */ 120 next_attr: 121 run = NULL; 122 err = -EINVAL; 123 attr = ni_enum_attr_ex(ni, attr, &le, NULL); 124 if (!attr) 125 goto end_enum; 126 127 if (le && le->vcn) { 128 /* This is non primary attribute segment. Ignore if not MFT. */ 129 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA) 130 goto next_attr; 131 132 run = &ni->file.run; 133 asize = le32_to_cpu(attr->size); 134 goto attr_unpack_run; 135 } 136 137 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off); 138 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size); 139 asize = le32_to_cpu(attr->size); 140 141 /* 142 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'. 143 * There not critical to check this case again 144 */ 145 if (attr->name_len && 146 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) > 147 asize) 148 goto out; 149 150 if (attr->non_res) { 151 t64 = le64_to_cpu(attr->nres.alloc_size); 152 if (le64_to_cpu(attr->nres.data_size) > t64 || 153 le64_to_cpu(attr->nres.valid_size) > t64) 154 goto out; 155 } 156 157 switch (attr->type) { 158 case ATTR_STD: 159 if (attr->non_res || 160 asize < sizeof(struct ATTR_STD_INFO) + roff || 161 rsize < sizeof(struct ATTR_STD_INFO)) 162 goto out; 163 164 if (std5) 165 goto next_attr; 166 167 std5 = Add2Ptr(attr, roff); 168 169 #ifdef STATX_BTIME 170 nt2kernel(std5->cr_time, &ni->i_crtime); 171 #endif 172 nt2kernel(std5->a_time, &ts); 173 inode_set_atime_to_ts(inode, ts); 174 nt2kernel(std5->c_time, &ts); 175 inode_set_ctime_to_ts(inode, ts); 176 nt2kernel(std5->m_time, &ts); 177 inode_set_mtime_to_ts(inode, ts); 178 179 ni->std_fa = std5->fa; 180 181 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && 182 rsize >= sizeof(struct ATTR_STD_INFO5)) 183 ni->std_security_id = std5->security_id; 184 goto next_attr; 185 186 case ATTR_LIST: 187 if (attr->name_len || le || ino == MFT_REC_LOG) 188 goto out; 189 190 err = ntfs_load_attr_list(ni, attr); 191 if (err) 192 goto out; 193 194 le = NULL; 195 attr = NULL; 196 goto next_attr; 197 198 case ATTR_NAME: 199 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || 200 rsize < SIZEOF_ATTRIBUTE_FILENAME) 201 goto out; 202 203 names += 1; 204 fname = Add2Ptr(attr, roff); 205 if (fname->type == FILE_NAME_DOS) 206 goto next_attr; 207 208 links += 1; 209 if (name && name->len == fname->name_len && 210 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, 211 NULL, false)) 212 is_match = true; 213 214 goto next_attr; 215 216 case ATTR_DATA: 217 if (is_dir) { 218 /* Ignore data attribute in dir record. */ 219 goto next_attr; 220 } 221 222 if (ino == MFT_REC_BADCLUST && !attr->non_res) 223 goto next_attr; 224 225 if (attr->name_len && 226 ((ino != MFT_REC_BADCLUST || !attr->non_res || 227 attr->name_len != ARRAY_SIZE(BAD_NAME) || 228 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && 229 (ino != MFT_REC_SECURE || !attr->non_res || 230 attr->name_len != ARRAY_SIZE(SDS_NAME) || 231 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { 232 /* File contains stream attribute. Ignore it. */ 233 goto next_attr; 234 } 235 236 if (is_attr_sparsed(attr)) 237 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; 238 else 239 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; 240 241 if (is_attr_compressed(attr)) 242 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; 243 else 244 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; 245 246 if (is_attr_encrypted(attr)) 247 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; 248 else 249 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; 250 251 if (!attr->non_res) { 252 ni->i_valid = inode->i_size = rsize; 253 inode_set_bytes(inode, rsize); 254 } 255 256 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); 257 258 if (!attr->non_res) { 259 ni->ni_flags |= NI_FLAG_RESIDENT; 260 goto next_attr; 261 } 262 263 inode_set_bytes(inode, attr_ondisk_size(attr)); 264 265 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 266 inode->i_size = le64_to_cpu(attr->nres.data_size); 267 if (!attr->nres.alloc_size) 268 goto next_attr; 269 270 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run : 271 &ni->file.run; 272 break; 273 274 case ATTR_ROOT: 275 if (attr->non_res) 276 goto out; 277 278 root = Add2Ptr(attr, roff); 279 280 if (attr->name_len != ARRAY_SIZE(I30_NAME) || 281 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 282 goto next_attr; 283 284 if (root->type != ATTR_NAME || 285 root->rule != NTFS_COLLATION_TYPE_FILENAME) 286 goto out; 287 288 if (!is_dir) 289 goto next_attr; 290 291 is_root = true; 292 ni->ni_flags |= NI_FLAG_DIR; 293 294 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 295 if (err) 296 goto out; 297 298 mode = sb->s_root ? 299 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) : 300 (S_IFDIR | 0777); 301 goto next_attr; 302 303 case ATTR_ALLOC: 304 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || 305 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 306 goto next_attr; 307 308 inode->i_size = le64_to_cpu(attr->nres.data_size); 309 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 310 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); 311 312 run = &ni->dir.alloc_run; 313 break; 314 315 case ATTR_BITMAP: 316 if (ino == MFT_REC_MFT) { 317 if (!attr->non_res) 318 goto out; 319 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 320 /* 0x20000000 = 2^32 / 8 */ 321 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) 322 goto out; 323 #endif 324 run = &sbi->mft.bitmap.run; 325 break; 326 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && 327 !memcmp(attr_name(attr), I30_NAME, 328 sizeof(I30_NAME)) && 329 attr->non_res) { 330 run = &ni->dir.bitmap_run; 331 break; 332 } 333 goto next_attr; 334 335 case ATTR_REPARSE: 336 if (attr->name_len) 337 goto next_attr; 338 339 rp_fa = ni_parse_reparse(ni, attr, &rp); 340 switch (rp_fa) { 341 case REPARSE_LINK: 342 /* 343 * Normal symlink. 344 * Assume one unicode symbol == one utf8. 345 */ 346 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer 347 .PrintNameLength) / 348 sizeof(u16); 349 ni->i_valid = inode->i_size; 350 /* Clear directory bit. */ 351 if (ni->ni_flags & NI_FLAG_DIR) { 352 indx_clear(&ni->dir); 353 memset(&ni->dir, 0, sizeof(ni->dir)); 354 ni->ni_flags &= ~NI_FLAG_DIR; 355 } else { 356 run_close(&ni->file.run); 357 } 358 mode = S_IFLNK | 0777; 359 is_dir = false; 360 if (attr->non_res) { 361 run = &ni->file.run; 362 goto attr_unpack_run; // Double break. 363 } 364 break; 365 366 case REPARSE_COMPRESSED: 367 break; 368 369 case REPARSE_DEDUPLICATED: 370 break; 371 } 372 goto next_attr; 373 374 case ATTR_EA_INFO: 375 if (!attr->name_len && 376 resident_data_ex(attr, sizeof(struct EA_INFO))) { 377 ni->ni_flags |= NI_FLAG_EA; 378 /* 379 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode 380 */ 381 inode->i_mode = mode; 382 ntfs_get_wsl_perm(inode); 383 mode = inode->i_mode; 384 } 385 goto next_attr; 386 387 default: 388 goto next_attr; 389 } 390 391 attr_unpack_run: 392 roff = le16_to_cpu(attr->nres.run_off); 393 394 if (roff > asize) { 395 err = -EINVAL; 396 goto out; 397 } 398 399 t64 = le64_to_cpu(attr->nres.svcn); 400 401 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), 402 t64, Add2Ptr(attr, roff), asize - roff); 403 if (err < 0) 404 goto out; 405 err = 0; 406 goto next_attr; 407 408 end_enum: 409 410 if (!std5) 411 goto out; 412 413 if (!is_match && name) { 414 err = -ENOENT; 415 goto out; 416 } 417 418 if (std5->fa & FILE_ATTRIBUTE_READONLY) 419 mode &= ~0222; 420 421 if (!names) { 422 err = -EINVAL; 423 goto out; 424 } 425 426 if (names != le16_to_cpu(rec->hard_links)) { 427 /* Correct minor error on the fly. Do not mark inode as dirty. */ 428 ntfs_inode_warn(inode, "Correct links count -> %u.", names); 429 rec->hard_links = cpu_to_le16(names); 430 ni->mi.dirty = true; 431 } 432 433 set_nlink(inode, links); 434 435 if (S_ISDIR(mode)) { 436 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; 437 438 /* 439 * Dot and dot-dot should be included in count but was not 440 * included in enumeration. 441 * Usually a hard links to directories are disabled. 442 */ 443 inode->i_op = &ntfs_dir_inode_operations; 444 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 445 &ntfs_legacy_dir_operations : 446 &ntfs_dir_operations; 447 ni->i_valid = 0; 448 } else if (S_ISLNK(mode)) { 449 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 450 inode->i_op = &ntfs_link_inode_operations; 451 inode->i_fop = NULL; 452 inode_nohighmem(inode); 453 } else if (S_ISREG(mode)) { 454 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 455 inode->i_op = &ntfs_file_inode_operations; 456 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 457 &ntfs_legacy_file_operations : 458 &ntfs_file_operations; 459 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 460 &ntfs_aops; 461 if (ino != MFT_REC_MFT) 462 init_rwsem(&ni->file.run_lock); 463 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || 464 S_ISSOCK(mode)) { 465 inode->i_op = &ntfs_special_inode_operations; 466 init_special_inode(inode, mode, inode->i_rdev); 467 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && 468 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { 469 /* Records in $Extend are not a files or general directories. */ 470 inode->i_op = &ntfs_file_inode_operations; 471 } else { 472 err = -EINVAL; 473 goto out; 474 } 475 476 if ((sbi->options->sys_immutable && 477 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 478 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 479 inode->i_flags |= S_IMMUTABLE; 480 } else { 481 inode->i_flags &= ~S_IMMUTABLE; 482 } 483 484 inode->i_mode = mode; 485 if (!(ni->ni_flags & NI_FLAG_EA)) { 486 /* If no xattr then no security (stored in xattr). */ 487 inode->i_flags |= S_NOSEC; 488 } 489 490 if (ino == MFT_REC_MFT && !sb->s_root) 491 sbi->mft.ni = NULL; 492 493 unlock_new_inode(inode); 494 495 return inode; 496 497 out: 498 if (ino == MFT_REC_MFT && !sb->s_root) 499 sbi->mft.ni = NULL; 500 501 iget_failed(inode); 502 return ERR_PTR(err); 503 } 504 505 /* 506 * ntfs_test_inode 507 * 508 * Return: 1 if match. 509 */ 510 static int ntfs_test_inode(struct inode *inode, void *data) 511 { 512 struct MFT_REF *ref = data; 513 514 return ino_get(ref) == inode->i_ino; 515 } 516 517 static int ntfs_set_inode(struct inode *inode, void *data) 518 { 519 const struct MFT_REF *ref = data; 520 521 inode->i_ino = ino_get(ref); 522 return 0; 523 } 524 525 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 526 const struct cpu_str *name) 527 { 528 struct inode *inode; 529 530 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 531 (void *)ref); 532 if (unlikely(!inode)) 533 return ERR_PTR(-ENOMEM); 534 535 /* If this is a freshly allocated inode, need to read it now. */ 536 if (inode->i_state & I_NEW) 537 inode = ntfs_read_mft(inode, name, ref); 538 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 539 /* Inode overlaps? */ 540 _ntfs_bad_inode(inode); 541 } 542 543 if (IS_ERR(inode) && name) 544 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR); 545 546 return inode; 547 } 548 549 enum get_block_ctx { 550 GET_BLOCK_GENERAL = 0, 551 GET_BLOCK_WRITE_BEGIN = 1, 552 GET_BLOCK_DIRECT_IO_R = 2, 553 GET_BLOCK_DIRECT_IO_W = 3, 554 GET_BLOCK_BMAP = 4, 555 }; 556 557 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 558 struct buffer_head *bh, int create, 559 enum get_block_ctx ctx) 560 { 561 struct super_block *sb = inode->i_sb; 562 struct ntfs_sb_info *sbi = sb->s_fs_info; 563 struct ntfs_inode *ni = ntfs_i(inode); 564 struct folio *folio = bh->b_folio; 565 u8 cluster_bits = sbi->cluster_bits; 566 u32 block_size = sb->s_blocksize; 567 u64 bytes, lbo, valid; 568 u32 off; 569 int err; 570 CLST vcn, lcn, len; 571 bool new; 572 573 /* Clear previous state. */ 574 clear_buffer_new(bh); 575 clear_buffer_uptodate(bh); 576 577 if (is_resident(ni)) { 578 bh->b_blocknr = RESIDENT_LCN; 579 bh->b_size = block_size; 580 if (!folio) { 581 /* direct io (read) or bmap call */ 582 err = 0; 583 } else { 584 ni_lock(ni); 585 err = attr_data_read_resident(ni, folio); 586 ni_unlock(ni); 587 588 if (!err) 589 set_buffer_uptodate(bh); 590 } 591 return err; 592 } 593 594 vcn = vbo >> cluster_bits; 595 off = vbo & sbi->cluster_mask; 596 new = false; 597 598 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL, 599 create && sbi->cluster_size > PAGE_SIZE); 600 if (err) 601 goto out; 602 603 if (!len) 604 return 0; 605 606 bytes = ((u64)len << cluster_bits) - off; 607 608 if (lcn == SPARSE_LCN) { 609 if (!create) { 610 if (bh->b_size > bytes) 611 bh->b_size = bytes; 612 return 0; 613 } 614 WARN_ON(1); 615 } 616 617 if (new) 618 set_buffer_new(bh); 619 620 lbo = ((u64)lcn << cluster_bits) + off; 621 622 set_buffer_mapped(bh); 623 bh->b_bdev = sb->s_bdev; 624 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 625 626 valid = ni->i_valid; 627 628 if (ctx == GET_BLOCK_DIRECT_IO_W) { 629 /* ntfs_direct_IO will update ni->i_valid. */ 630 if (vbo >= valid) 631 set_buffer_new(bh); 632 } else if (create) { 633 /* Normal write. */ 634 if (bytes > bh->b_size) 635 bytes = bh->b_size; 636 637 if (vbo >= valid) 638 set_buffer_new(bh); 639 640 if (vbo + bytes > valid) { 641 ni->i_valid = vbo + bytes; 642 mark_inode_dirty(inode); 643 } 644 } else if (vbo >= valid) { 645 /* Read out of valid data. */ 646 clear_buffer_mapped(bh); 647 } else if (vbo + bytes <= valid) { 648 /* Normal read. */ 649 } else if (vbo + block_size <= valid) { 650 /* Normal short read. */ 651 bytes = block_size; 652 } else { 653 /* 654 * Read across valid size: vbo < valid && valid < vbo + block_size 655 */ 656 bytes = block_size; 657 658 if (folio) { 659 u32 voff = valid - vbo; 660 661 bh->b_size = block_size; 662 off = vbo & (PAGE_SIZE - 1); 663 folio_set_bh(bh, folio, off); 664 665 if (bh_read(bh, 0) < 0) { 666 err = -EIO; 667 goto out; 668 } 669 folio_zero_segment(folio, off + voff, off + block_size); 670 } 671 } 672 673 if (bh->b_size > bytes) 674 bh->b_size = bytes; 675 676 #ifndef __LP64__ 677 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 678 static_assert(sizeof(size_t) < sizeof(loff_t)); 679 if (bytes > 0x40000000u) 680 bh->b_size = 0x40000000u; 681 } 682 #endif 683 684 return 0; 685 686 out: 687 return err; 688 } 689 690 int ntfs_get_block(struct inode *inode, sector_t vbn, 691 struct buffer_head *bh_result, int create) 692 { 693 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 694 bh_result, create, GET_BLOCK_GENERAL); 695 } 696 697 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 698 struct buffer_head *bh_result, int create) 699 { 700 return ntfs_get_block_vbo(inode, 701 (u64)vsn << inode->i_sb->s_blocksize_bits, 702 bh_result, create, GET_BLOCK_BMAP); 703 } 704 705 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 706 { 707 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 708 } 709 710 static int ntfs_read_folio(struct file *file, struct folio *folio) 711 { 712 int err; 713 struct address_space *mapping = folio->mapping; 714 struct inode *inode = mapping->host; 715 struct ntfs_inode *ni = ntfs_i(inode); 716 717 if (is_resident(ni)) { 718 ni_lock(ni); 719 err = attr_data_read_resident(ni, folio); 720 ni_unlock(ni); 721 if (err != E_NTFS_NONRESIDENT) { 722 folio_unlock(folio); 723 return err; 724 } 725 } 726 727 if (is_compressed(ni)) { 728 ni_lock(ni); 729 err = ni_readpage_cmpr(ni, folio); 730 ni_unlock(ni); 731 return err; 732 } 733 734 /* Normal + sparse files. */ 735 return mpage_read_folio(folio, ntfs_get_block); 736 } 737 738 static void ntfs_readahead(struct readahead_control *rac) 739 { 740 struct address_space *mapping = rac->mapping; 741 struct inode *inode = mapping->host; 742 struct ntfs_inode *ni = ntfs_i(inode); 743 u64 valid; 744 loff_t pos; 745 746 if (is_resident(ni)) { 747 /* No readahead for resident. */ 748 return; 749 } 750 751 if (is_compressed(ni)) { 752 /* No readahead for compressed. */ 753 return; 754 } 755 756 valid = ni->i_valid; 757 pos = readahead_pos(rac); 758 759 if (valid < i_size_read(inode) && pos <= valid && 760 valid < pos + readahead_length(rac)) { 761 /* Range cross 'valid'. Read it page by page. */ 762 return; 763 } 764 765 mpage_readahead(rac, ntfs_get_block); 766 } 767 768 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 769 struct buffer_head *bh_result, int create) 770 { 771 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 772 bh_result, create, GET_BLOCK_DIRECT_IO_R); 773 } 774 775 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 776 struct buffer_head *bh_result, int create) 777 { 778 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 779 bh_result, create, GET_BLOCK_DIRECT_IO_W); 780 } 781 782 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 783 { 784 struct file *file = iocb->ki_filp; 785 struct address_space *mapping = file->f_mapping; 786 struct inode *inode = mapping->host; 787 struct ntfs_inode *ni = ntfs_i(inode); 788 loff_t vbo = iocb->ki_pos; 789 loff_t end; 790 int wr = iov_iter_rw(iter) & WRITE; 791 size_t iter_count = iov_iter_count(iter); 792 loff_t valid; 793 ssize_t ret; 794 795 if (is_resident(ni)) { 796 /* Switch to buffered write. */ 797 ret = 0; 798 goto out; 799 } 800 801 ret = blockdev_direct_IO(iocb, inode, iter, 802 wr ? ntfs_get_block_direct_IO_W : 803 ntfs_get_block_direct_IO_R); 804 805 if (ret > 0) 806 end = vbo + ret; 807 else if (wr && ret == -EIOCBQUEUED) 808 end = vbo + iter_count; 809 else 810 goto out; 811 812 valid = ni->i_valid; 813 if (wr) { 814 if (end > valid && !S_ISBLK(inode->i_mode)) { 815 ni->i_valid = end; 816 mark_inode_dirty(inode); 817 } 818 } else if (vbo < valid && valid < end) { 819 /* Fix page. */ 820 iov_iter_revert(iter, end - valid); 821 iov_iter_zero(end - valid, iter); 822 } 823 824 out: 825 return ret; 826 } 827 828 int ntfs_set_size(struct inode *inode, u64 new_size) 829 { 830 struct super_block *sb = inode->i_sb; 831 struct ntfs_sb_info *sbi = sb->s_fs_info; 832 struct ntfs_inode *ni = ntfs_i(inode); 833 int err; 834 835 /* Check for maximum file size. */ 836 if (is_sparsed(ni) || is_compressed(ni)) { 837 if (new_size > sbi->maxbytes_sparse) { 838 err = -EFBIG; 839 goto out; 840 } 841 } else if (new_size > sbi->maxbytes) { 842 err = -EFBIG; 843 goto out; 844 } 845 846 ni_lock(ni); 847 down_write(&ni->file.run_lock); 848 849 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 850 &ni->i_valid, true, NULL); 851 852 up_write(&ni->file.run_lock); 853 ni_unlock(ni); 854 855 mark_inode_dirty(inode); 856 857 out: 858 return err; 859 } 860 861 static int ntfs_resident_writepage(struct folio *folio, 862 struct writeback_control *wbc, void *data) 863 { 864 struct address_space *mapping = data; 865 struct inode *inode = mapping->host; 866 struct ntfs_inode *ni = ntfs_i(inode); 867 int ret; 868 869 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 870 return -EIO; 871 872 ni_lock(ni); 873 ret = attr_data_write_resident(ni, folio); 874 ni_unlock(ni); 875 876 if (ret != E_NTFS_NONRESIDENT) 877 folio_unlock(folio); 878 mapping_set_error(mapping, ret); 879 return ret; 880 } 881 882 static int ntfs_writepages(struct address_space *mapping, 883 struct writeback_control *wbc) 884 { 885 struct inode *inode = mapping->host; 886 887 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 888 return -EIO; 889 890 if (is_resident(ntfs_i(inode))) 891 return write_cache_pages(mapping, wbc, ntfs_resident_writepage, 892 mapping); 893 return mpage_writepages(mapping, wbc, ntfs_get_block); 894 } 895 896 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 897 struct buffer_head *bh_result, int create) 898 { 899 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 900 bh_result, create, GET_BLOCK_WRITE_BEGIN); 901 } 902 903 int ntfs_write_begin(struct file *file, struct address_space *mapping, 904 loff_t pos, u32 len, struct page **pagep, void **fsdata) 905 { 906 int err; 907 struct inode *inode = mapping->host; 908 struct ntfs_inode *ni = ntfs_i(inode); 909 910 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 911 return -EIO; 912 913 *pagep = NULL; 914 if (is_resident(ni)) { 915 struct folio *folio = __filemap_get_folio( 916 mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN, 917 mapping_gfp_mask(mapping)); 918 919 if (IS_ERR(folio)) { 920 err = PTR_ERR(folio); 921 goto out; 922 } 923 924 ni_lock(ni); 925 err = attr_data_read_resident(ni, folio); 926 ni_unlock(ni); 927 928 if (!err) { 929 *pagep = &folio->page; 930 goto out; 931 } 932 folio_unlock(folio); 933 folio_put(folio); 934 935 if (err != E_NTFS_NONRESIDENT) 936 goto out; 937 } 938 939 err = block_write_begin(mapping, pos, len, pagep, 940 ntfs_get_block_write_begin); 941 942 out: 943 return err; 944 } 945 946 /* 947 * ntfs_write_end - Address_space_operations::write_end. 948 */ 949 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, 950 u32 len, u32 copied, struct page *page, void *fsdata) 951 { 952 struct folio *folio = page_folio(page); 953 struct inode *inode = mapping->host; 954 struct ntfs_inode *ni = ntfs_i(inode); 955 u64 valid = ni->i_valid; 956 bool dirty = false; 957 int err; 958 959 if (is_resident(ni)) { 960 ni_lock(ni); 961 err = attr_data_write_resident(ni, folio); 962 ni_unlock(ni); 963 if (!err) { 964 struct buffer_head *head = folio_buffers(folio); 965 dirty = true; 966 /* Clear any buffers in folio. */ 967 if (head) { 968 struct buffer_head *bh = head; 969 970 do { 971 clear_buffer_dirty(bh); 972 clear_buffer_mapped(bh); 973 set_buffer_uptodate(bh); 974 } while (head != (bh = bh->b_this_page)); 975 } 976 folio_mark_uptodate(folio); 977 err = copied; 978 } 979 folio_unlock(folio); 980 folio_put(folio); 981 } else { 982 err = generic_write_end(file, mapping, pos, len, copied, page, 983 fsdata); 984 } 985 986 if (err >= 0) { 987 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 988 inode_set_mtime_to_ts(inode, 989 inode_set_ctime_current(inode)); 990 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 991 dirty = true; 992 } 993 994 if (valid != ni->i_valid) { 995 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 996 dirty = true; 997 } 998 999 if (pos + err > inode->i_size) { 1000 i_size_write(inode, pos + err); 1001 dirty = true; 1002 } 1003 1004 if (dirty) 1005 mark_inode_dirty(inode); 1006 } 1007 1008 return err; 1009 } 1010 1011 int reset_log_file(struct inode *inode) 1012 { 1013 int err; 1014 loff_t pos = 0; 1015 u32 log_size = inode->i_size; 1016 struct address_space *mapping = inode->i_mapping; 1017 1018 for (;;) { 1019 u32 len; 1020 void *kaddr; 1021 struct page *page; 1022 1023 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 1024 1025 err = block_write_begin(mapping, pos, len, &page, 1026 ntfs_get_block_write_begin); 1027 if (err) 1028 goto out; 1029 1030 kaddr = kmap_atomic(page); 1031 memset(kaddr, -1, len); 1032 kunmap_atomic(kaddr); 1033 flush_dcache_page(page); 1034 1035 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 1036 if (err < 0) 1037 goto out; 1038 pos += len; 1039 1040 if (pos >= log_size) 1041 break; 1042 balance_dirty_pages_ratelimited(mapping); 1043 } 1044 out: 1045 mark_inode_dirty_sync(inode); 1046 1047 return err; 1048 } 1049 1050 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1051 { 1052 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1053 } 1054 1055 int ntfs_sync_inode(struct inode *inode) 1056 { 1057 return _ni_write_inode(inode, 1); 1058 } 1059 1060 /* 1061 * writeback_inode - Helper function for ntfs_flush_inodes(). 1062 * 1063 * This writes both the inode and the file data blocks, waiting 1064 * for in flight data blocks before the start of the call. It 1065 * does not wait for any io started during the call. 1066 */ 1067 static int writeback_inode(struct inode *inode) 1068 { 1069 int ret = sync_inode_metadata(inode, 0); 1070 1071 if (!ret) 1072 ret = filemap_fdatawrite(inode->i_mapping); 1073 return ret; 1074 } 1075 1076 /* 1077 * ntfs_flush_inodes 1078 * 1079 * Write data and metadata corresponding to i1 and i2. The io is 1080 * started but we do not wait for any of it to finish. 1081 * 1082 * filemap_flush() is used for the block device, so if there is a dirty 1083 * page for a block already in flight, we will not wait and start the 1084 * io over again. 1085 */ 1086 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1087 struct inode *i2) 1088 { 1089 int ret = 0; 1090 1091 if (i1) 1092 ret = writeback_inode(i1); 1093 if (!ret && i2) 1094 ret = writeback_inode(i2); 1095 if (!ret) 1096 ret = filemap_flush(sb->s_bdev_file->f_mapping); 1097 return ret; 1098 } 1099 1100 /* 1101 * Helper function to read file. 1102 */ 1103 int inode_read_data(struct inode *inode, void *data, size_t bytes) 1104 { 1105 pgoff_t idx; 1106 struct address_space *mapping = inode->i_mapping; 1107 1108 for (idx = 0; bytes; idx++) { 1109 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1110 struct page *page = read_mapping_page(mapping, idx, NULL); 1111 void *kaddr; 1112 1113 if (IS_ERR(page)) 1114 return PTR_ERR(page); 1115 1116 kaddr = kmap_atomic(page); 1117 memcpy(data, kaddr, op); 1118 kunmap_atomic(kaddr); 1119 1120 put_page(page); 1121 1122 bytes -= op; 1123 data = Add2Ptr(data, PAGE_SIZE); 1124 } 1125 return 0; 1126 } 1127 1128 /* 1129 * ntfs_reparse_bytes 1130 * 1131 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1132 * for unicode string of @uni_len length. 1133 */ 1134 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1135 { 1136 /* Header + unicode string + decorated unicode string. */ 1137 return sizeof(short) * (2 * uni_len + 4) + 1138 offsetof(struct REPARSE_DATA_BUFFER, 1139 SymbolicLinkReparseBuffer.PathBuffer); 1140 } 1141 1142 static struct REPARSE_DATA_BUFFER * 1143 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1144 u32 size, u16 *nsize) 1145 { 1146 int i, err; 1147 struct REPARSE_DATA_BUFFER *rp; 1148 __le16 *rp_name; 1149 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1150 1151 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1152 if (!rp) 1153 return ERR_PTR(-ENOMEM); 1154 1155 rs = &rp->SymbolicLinkReparseBuffer; 1156 rp_name = rs->PathBuffer; 1157 1158 /* Convert link name to UTF-16. */ 1159 err = ntfs_nls_to_utf16(sbi, symname, size, 1160 (struct cpu_str *)(rp_name - 1), 2 * size, 1161 UTF16_LITTLE_ENDIAN); 1162 if (err < 0) 1163 goto out; 1164 1165 /* err = the length of unicode name of symlink. */ 1166 *nsize = ntfs_reparse_bytes(err); 1167 1168 if (*nsize > sbi->reparse.max_size) { 1169 err = -EFBIG; 1170 goto out; 1171 } 1172 1173 /* Translate Linux '/' into Windows '\'. */ 1174 for (i = 0; i < err; i++) { 1175 if (rp_name[i] == cpu_to_le16('/')) 1176 rp_name[i] = cpu_to_le16('\\'); 1177 } 1178 1179 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1180 rp->ReparseDataLength = 1181 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1182 SymbolicLinkReparseBuffer)); 1183 1184 /* PrintName + SubstituteName. */ 1185 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1186 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1187 rs->PrintNameLength = rs->SubstituteNameOffset; 1188 1189 /* 1190 * TODO: Use relative path if possible to allow Windows to 1191 * parse this path. 1192 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1193 */ 1194 rs->Flags = 0; 1195 1196 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1197 1198 /* Decorate SubstituteName. */ 1199 rp_name += err; 1200 rp_name[0] = cpu_to_le16('\\'); 1201 rp_name[1] = cpu_to_le16('?'); 1202 rp_name[2] = cpu_to_le16('?'); 1203 rp_name[3] = cpu_to_le16('\\'); 1204 1205 return rp; 1206 out: 1207 kfree(rp); 1208 return ERR_PTR(err); 1209 } 1210 1211 /* 1212 * ntfs_create_inode 1213 * 1214 * Helper function for: 1215 * - ntfs_create 1216 * - ntfs_mknod 1217 * - ntfs_symlink 1218 * - ntfs_mkdir 1219 * - ntfs_atomic_open 1220 * 1221 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked 1222 */ 1223 int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, 1224 struct dentry *dentry, const struct cpu_str *uni, 1225 umode_t mode, dev_t dev, const char *symname, u32 size, 1226 struct ntfs_fnd *fnd) 1227 { 1228 int err; 1229 struct super_block *sb = dir->i_sb; 1230 struct ntfs_sb_info *sbi = sb->s_fs_info; 1231 const struct qstr *name = &dentry->d_name; 1232 CLST ino = 0; 1233 struct ntfs_inode *dir_ni = ntfs_i(dir); 1234 struct ntfs_inode *ni = NULL; 1235 struct inode *inode = NULL; 1236 struct ATTRIB *attr; 1237 struct ATTR_STD_INFO5 *std5; 1238 struct ATTR_FILE_NAME *fname; 1239 struct MFT_REC *rec; 1240 u32 asize, dsize, sd_size; 1241 enum FILE_ATTRIBUTE fa; 1242 __le32 security_id = SECURITY_ID_INVALID; 1243 CLST vcn; 1244 const void *sd; 1245 u16 t16, nsize = 0, aid = 0; 1246 struct INDEX_ROOT *root, *dir_root; 1247 struct NTFS_DE *e, *new_de = NULL; 1248 struct REPARSE_DATA_BUFFER *rp = NULL; 1249 bool rp_inserted = false; 1250 1251 /* New file will be resident or non resident. */ 1252 const bool new_file_resident = 1; 1253 1254 if (!fnd) 1255 ni_lock_dir(dir_ni); 1256 1257 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1258 if (!dir_root) { 1259 err = -EINVAL; 1260 goto out1; 1261 } 1262 1263 if (S_ISDIR(mode)) { 1264 /* Use parent's directory attributes. */ 1265 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1266 FILE_ATTRIBUTE_ARCHIVE; 1267 /* 1268 * By default child directory inherits parent attributes. 1269 * Root directory is hidden + system. 1270 * Make an exception for children in root. 1271 */ 1272 if (dir->i_ino == MFT_REC_ROOT) 1273 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1274 } else if (S_ISLNK(mode)) { 1275 /* It is good idea that link should be the same type (file/dir) as target */ 1276 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1277 1278 /* 1279 * Linux: there are dir/file/symlink and so on. 1280 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1281 * It is good idea to create: 1282 * dir + reparse if 'symname' points to directory 1283 * or 1284 * file + reparse if 'symname' points to file 1285 * Unfortunately kern_path hangs if symname contains 'dir'. 1286 */ 1287 1288 /* 1289 * struct path path; 1290 * 1291 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1292 * struct inode *target = d_inode(path.dentry); 1293 * 1294 * if (S_ISDIR(target->i_mode)) 1295 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1296 * // if ( target->i_sb == sb ){ 1297 * // use relative path? 1298 * // } 1299 * path_put(&path); 1300 * } 1301 */ 1302 } else if (S_ISREG(mode)) { 1303 if (sbi->options->sparse) { 1304 /* Sparsed regular file, cause option 'sparse'. */ 1305 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1306 FILE_ATTRIBUTE_ARCHIVE; 1307 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1308 /* Compressed regular file, if parent is compressed. */ 1309 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1310 } else { 1311 /* Regular file, default attributes. */ 1312 fa = FILE_ATTRIBUTE_ARCHIVE; 1313 } 1314 } else { 1315 fa = FILE_ATTRIBUTE_ARCHIVE; 1316 } 1317 1318 /* If option "hide_dot_files" then set hidden attribute for dot files. */ 1319 if (sbi->options->hide_dot_files && name->name[0] == '.') 1320 fa |= FILE_ATTRIBUTE_HIDDEN; 1321 1322 if (!(mode & 0222)) 1323 fa |= FILE_ATTRIBUTE_READONLY; 1324 1325 /* Allocate PATH_MAX bytes. */ 1326 new_de = __getname(); 1327 if (!new_de) { 1328 err = -ENOMEM; 1329 goto out1; 1330 } 1331 1332 if (unlikely(ntfs3_forced_shutdown(sb))) { 1333 err = -EIO; 1334 goto out2; 1335 } 1336 1337 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1338 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1339 1340 /* Step 1: allocate and fill new mft record. */ 1341 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1342 if (err) 1343 goto out2; 1344 1345 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); 1346 if (IS_ERR(ni)) { 1347 err = PTR_ERR(ni); 1348 ni = NULL; 1349 goto out3; 1350 } 1351 inode = &ni->vfs_inode; 1352 inode_init_owner(idmap, inode, dir, mode); 1353 mode = inode->i_mode; 1354 1355 ni->i_crtime = current_time(inode); 1356 1357 rec = ni->mi.mrec; 1358 rec->hard_links = cpu_to_le16(1); 1359 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1360 1361 /* Get default security id. */ 1362 sd = s_default_security; 1363 sd_size = sizeof(s_default_security); 1364 1365 if (is_ntfs3(sbi)) { 1366 security_id = dir_ni->std_security_id; 1367 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1368 security_id = sbi->security.def_security_id; 1369 1370 if (security_id == SECURITY_ID_INVALID && 1371 !ntfs_insert_security(sbi, sd, sd_size, 1372 &security_id, NULL)) 1373 sbi->security.def_security_id = security_id; 1374 } 1375 } 1376 1377 /* Insert standard info. */ 1378 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1379 1380 if (security_id == SECURITY_ID_INVALID) { 1381 dsize = sizeof(struct ATTR_STD_INFO); 1382 } else { 1383 dsize = sizeof(struct ATTR_STD_INFO5); 1384 std5->security_id = security_id; 1385 ni->std_security_id = security_id; 1386 } 1387 asize = SIZEOF_RESIDENT + dsize; 1388 1389 attr->type = ATTR_STD; 1390 attr->size = cpu_to_le32(asize); 1391 attr->id = cpu_to_le16(aid++); 1392 attr->res.data_off = SIZEOF_RESIDENT_LE; 1393 attr->res.data_size = cpu_to_le32(dsize); 1394 1395 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1396 kernel2nt(&ni->i_crtime); 1397 1398 std5->fa = ni->std_fa = fa; 1399 1400 attr = Add2Ptr(attr, asize); 1401 1402 /* Insert file name. */ 1403 err = fill_name_de(sbi, new_de, name, uni); 1404 if (err) 1405 goto out4; 1406 1407 mi_get_ref(&ni->mi, &new_de->ref); 1408 1409 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1410 1411 if (sbi->options->windows_names && 1412 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) { 1413 err = -EINVAL; 1414 goto out4; 1415 } 1416 1417 mi_get_ref(&dir_ni->mi, &fname->home); 1418 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1419 fname->dup.a_time = std5->cr_time; 1420 fname->dup.alloc_size = fname->dup.data_size = 0; 1421 fname->dup.fa = std5->fa; 1422 fname->dup.ea_size = fname->dup.reparse = 0; 1423 1424 dsize = le16_to_cpu(new_de->key_size); 1425 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1426 1427 attr->type = ATTR_NAME; 1428 attr->size = cpu_to_le32(asize); 1429 attr->res.data_off = SIZEOF_RESIDENT_LE; 1430 attr->res.flags = RESIDENT_FLAG_INDEXED; 1431 attr->id = cpu_to_le16(aid++); 1432 attr->res.data_size = cpu_to_le32(dsize); 1433 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1434 1435 attr = Add2Ptr(attr, asize); 1436 1437 if (security_id == SECURITY_ID_INVALID) { 1438 /* Insert security attribute. */ 1439 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1440 1441 attr->type = ATTR_SECURE; 1442 attr->size = cpu_to_le32(asize); 1443 attr->id = cpu_to_le16(aid++); 1444 attr->res.data_off = SIZEOF_RESIDENT_LE; 1445 attr->res.data_size = cpu_to_le32(sd_size); 1446 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1447 1448 attr = Add2Ptr(attr, asize); 1449 } 1450 1451 attr->id = cpu_to_le16(aid++); 1452 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1453 /* 1454 * Regular directory or symlink to directory. 1455 * Create root attribute. 1456 */ 1457 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1458 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1459 1460 attr->type = ATTR_ROOT; 1461 attr->size = cpu_to_le32(asize); 1462 1463 attr->name_len = ARRAY_SIZE(I30_NAME); 1464 attr->name_off = SIZEOF_RESIDENT_LE; 1465 attr->res.data_off = 1466 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1467 attr->res.data_size = cpu_to_le32(dsize); 1468 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1469 sizeof(I30_NAME)); 1470 1471 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1472 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1473 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); 1474 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1475 sizeof(struct NTFS_DE)); 1476 root->ihdr.total = root->ihdr.used; 1477 1478 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1479 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1480 e->flags = NTFS_IE_LAST; 1481 } else if (S_ISLNK(mode)) { 1482 /* 1483 * Symlink to file. 1484 * Create empty resident data attribute. 1485 */ 1486 asize = SIZEOF_RESIDENT; 1487 1488 /* Insert empty ATTR_DATA */ 1489 attr->type = ATTR_DATA; 1490 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1491 attr->name_off = SIZEOF_RESIDENT_LE; 1492 attr->res.data_off = SIZEOF_RESIDENT_LE; 1493 } else if (!new_file_resident && S_ISREG(mode)) { 1494 /* 1495 * Regular file. Create empty non resident data attribute. 1496 */ 1497 attr->type = ATTR_DATA; 1498 attr->non_res = 1; 1499 attr->nres.evcn = cpu_to_le64(-1ll); 1500 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1501 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1502 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1503 attr->flags = ATTR_FLAG_SPARSED; 1504 asize = SIZEOF_NONRESIDENT_EX + 8; 1505 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1506 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1507 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1508 attr->flags = ATTR_FLAG_COMPRESSED; 1509 attr->nres.c_unit = NTFS_LZNT_CUNIT; 1510 asize = SIZEOF_NONRESIDENT_EX + 8; 1511 } else { 1512 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1513 attr->name_off = SIZEOF_NONRESIDENT_LE; 1514 asize = SIZEOF_NONRESIDENT + 8; 1515 } 1516 attr->nres.run_off = attr->name_off; 1517 } else { 1518 /* 1519 * Node. Create empty resident data attribute. 1520 */ 1521 attr->type = ATTR_DATA; 1522 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1523 attr->name_off = SIZEOF_RESIDENT_LE; 1524 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1525 attr->flags = ATTR_FLAG_SPARSED; 1526 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1527 attr->flags = ATTR_FLAG_COMPRESSED; 1528 attr->res.data_off = SIZEOF_RESIDENT_LE; 1529 asize = SIZEOF_RESIDENT; 1530 ni->ni_flags |= NI_FLAG_RESIDENT; 1531 } 1532 1533 if (S_ISDIR(mode)) { 1534 ni->ni_flags |= NI_FLAG_DIR; 1535 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1536 if (err) 1537 goto out4; 1538 } else if (S_ISLNK(mode)) { 1539 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1540 1541 if (IS_ERR(rp)) { 1542 err = PTR_ERR(rp); 1543 rp = NULL; 1544 goto out4; 1545 } 1546 1547 /* 1548 * Insert ATTR_REPARSE. 1549 */ 1550 attr = Add2Ptr(attr, asize); 1551 attr->type = ATTR_REPARSE; 1552 attr->id = cpu_to_le16(aid++); 1553 1554 /* Resident or non resident? */ 1555 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1556 t16 = PtrOffset(rec, attr); 1557 1558 /* 1559 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1560 * It is good idea to keep extended attributes resident. 1561 */ 1562 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1563 CLST alen; 1564 CLST clst = bytes_to_cluster(sbi, nsize); 1565 1566 /* Bytes per runs. */ 1567 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1568 1569 attr->non_res = 1; 1570 attr->nres.evcn = cpu_to_le64(clst - 1); 1571 attr->name_off = SIZEOF_NONRESIDENT_LE; 1572 attr->nres.run_off = attr->name_off; 1573 attr->nres.data_size = cpu_to_le64(nsize); 1574 attr->nres.valid_size = attr->nres.data_size; 1575 attr->nres.alloc_size = 1576 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1577 1578 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1579 clst, NULL, ALLOCATE_DEF, 1580 &alen, 0, NULL, NULL); 1581 if (err) 1582 goto out5; 1583 1584 err = run_pack(&ni->file.run, 0, clst, 1585 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1586 &vcn); 1587 if (err < 0) 1588 goto out5; 1589 1590 if (vcn != clst) { 1591 err = -EINVAL; 1592 goto out5; 1593 } 1594 1595 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1596 /* Write non resident data. */ 1597 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, 1598 nsize, 0); 1599 if (err) 1600 goto out5; 1601 } else { 1602 attr->res.data_off = SIZEOF_RESIDENT_LE; 1603 attr->res.data_size = cpu_to_le32(nsize); 1604 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1605 } 1606 /* Size of symlink equals the length of input string. */ 1607 inode->i_size = size; 1608 1609 attr->size = cpu_to_le32(asize); 1610 1611 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1612 &new_de->ref); 1613 if (err) 1614 goto out5; 1615 1616 rp_inserted = true; 1617 } 1618 1619 attr = Add2Ptr(attr, asize); 1620 attr->type = ATTR_END; 1621 1622 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1623 rec->next_attr_id = cpu_to_le16(aid); 1624 1625 inode->i_generation = le16_to_cpu(rec->seq); 1626 1627 if (S_ISDIR(mode)) { 1628 inode->i_op = &ntfs_dir_inode_operations; 1629 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 1630 &ntfs_legacy_dir_operations : 1631 &ntfs_dir_operations; 1632 } else if (S_ISLNK(mode)) { 1633 inode->i_op = &ntfs_link_inode_operations; 1634 inode->i_fop = NULL; 1635 inode->i_mapping->a_ops = &ntfs_aops; 1636 inode->i_size = size; 1637 inode_nohighmem(inode); 1638 } else if (S_ISREG(mode)) { 1639 inode->i_op = &ntfs_file_inode_operations; 1640 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 1641 &ntfs_legacy_file_operations : 1642 &ntfs_file_operations; 1643 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 1644 &ntfs_aops; 1645 init_rwsem(&ni->file.run_lock); 1646 } else { 1647 inode->i_op = &ntfs_special_inode_operations; 1648 init_special_inode(inode, mode, dev); 1649 } 1650 1651 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1652 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1653 err = ntfs_init_acl(idmap, inode, dir); 1654 if (err) 1655 goto out5; 1656 } else 1657 #endif 1658 { 1659 inode->i_flags |= S_NOSEC; 1660 } 1661 1662 /* 1663 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. 1664 * The packed size of extended attribute is stored in direntry too. 1665 * 'fname' here points to inside new_de. 1666 */ 1667 err = ntfs_save_wsl_perm(inode, &fname->dup.ea_size); 1668 if (err) 1669 goto out6; 1670 1671 /* 1672 * update ea_size in file_name attribute too. 1673 * Use ni_find_attr cause layout of MFT record may be changed 1674 * in ntfs_init_acl and ntfs_save_wsl_perm. 1675 */ 1676 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL); 1677 if (attr) { 1678 struct ATTR_FILE_NAME *fn; 1679 1680 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1681 if (fn) 1682 fn->dup.ea_size = fname->dup.ea_size; 1683 } 1684 1685 /* We do not need to update parent directory later */ 1686 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; 1687 1688 /* Step 2: Add new name in index. */ 1689 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1690 if (err) 1691 goto out6; 1692 1693 /* 1694 * Call 'd_instantiate' after inode->i_op is set 1695 * but before finish_open. 1696 */ 1697 d_instantiate(dentry, inode); 1698 1699 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ 1700 inode_set_atime_to_ts(inode, ni->i_crtime); 1701 inode_set_ctime_to_ts(inode, ni->i_crtime); 1702 inode_set_mtime_to_ts(inode, ni->i_crtime); 1703 inode_set_mtime_to_ts(dir, ni->i_crtime); 1704 inode_set_ctime_to_ts(dir, ni->i_crtime); 1705 1706 mark_inode_dirty(dir); 1707 mark_inode_dirty(inode); 1708 1709 /* Normal exit. */ 1710 goto out2; 1711 1712 out6: 1713 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL); 1714 if (attr && attr->non_res) { 1715 /* Delete ATTR_EA, if non-resident. */ 1716 attr_set_size(ni, ATTR_EA, NULL, 0, NULL, 0, NULL, false, NULL); 1717 } 1718 1719 if (rp_inserted) 1720 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1721 1722 out5: 1723 if (!S_ISDIR(mode)) 1724 run_deallocate(sbi, &ni->file.run, false); 1725 1726 out4: 1727 clear_rec_inuse(rec); 1728 clear_nlink(inode); 1729 ni->mi.dirty = false; 1730 discard_new_inode(inode); 1731 out3: 1732 ntfs_mark_rec_free(sbi, ino, false); 1733 1734 out2: 1735 __putname(new_de); 1736 kfree(rp); 1737 1738 out1: 1739 if (!fnd) 1740 ni_unlock(dir_ni); 1741 1742 if (!err) 1743 unlock_new_inode(inode); 1744 1745 return err; 1746 } 1747 1748 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1749 { 1750 int err; 1751 struct ntfs_inode *ni = ntfs_i(inode); 1752 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1753 struct NTFS_DE *de; 1754 1755 /* Allocate PATH_MAX bytes. */ 1756 de = __getname(); 1757 if (!de) 1758 return -ENOMEM; 1759 1760 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1761 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1762 1763 /* Construct 'de'. */ 1764 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1765 if (err) 1766 goto out; 1767 1768 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1769 out: 1770 __putname(de); 1771 return err; 1772 } 1773 1774 /* 1775 * ntfs_unlink_inode 1776 * 1777 * inode_operations::unlink 1778 * inode_operations::rmdir 1779 */ 1780 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1781 { 1782 int err; 1783 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1784 struct inode *inode = d_inode(dentry); 1785 struct ntfs_inode *ni = ntfs_i(inode); 1786 struct ntfs_inode *dir_ni = ntfs_i(dir); 1787 struct NTFS_DE *de, *de2 = NULL; 1788 int undo_remove; 1789 1790 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1791 return -EINVAL; 1792 1793 /* Allocate PATH_MAX bytes. */ 1794 de = __getname(); 1795 if (!de) 1796 return -ENOMEM; 1797 1798 ni_lock(ni); 1799 1800 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1801 err = -ENOTEMPTY; 1802 goto out; 1803 } 1804 1805 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1806 if (err < 0) 1807 goto out; 1808 1809 undo_remove = 0; 1810 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1811 1812 if (!err) { 1813 drop_nlink(inode); 1814 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 1815 mark_inode_dirty(dir); 1816 inode_set_ctime_to_ts(inode, inode_get_ctime(dir)); 1817 if (inode->i_nlink) 1818 mark_inode_dirty(inode); 1819 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1820 _ntfs_bad_inode(inode); 1821 } else { 1822 if (ni_is_dirty(dir)) 1823 mark_inode_dirty(dir); 1824 if (ni_is_dirty(inode)) 1825 mark_inode_dirty(inode); 1826 } 1827 1828 out: 1829 ni_unlock(ni); 1830 __putname(de); 1831 return err; 1832 } 1833 1834 void ntfs_evict_inode(struct inode *inode) 1835 { 1836 truncate_inode_pages_final(&inode->i_data); 1837 1838 invalidate_inode_buffers(inode); 1839 clear_inode(inode); 1840 1841 ni_clear(ntfs_i(inode)); 1842 } 1843 1844 /* 1845 * ntfs_translate_junction 1846 * 1847 * Translate a Windows junction target to the Linux equivalent. 1848 * On junctions, targets are always absolute (they include the drive 1849 * letter). We have no way of knowing if the target is for the current 1850 * mounted device or not so we just assume it is. 1851 */ 1852 static int ntfs_translate_junction(const struct super_block *sb, 1853 const struct dentry *link_de, char *target, 1854 int target_len, int target_max) 1855 { 1856 int tl_len, err = target_len; 1857 char *link_path_buffer = NULL, *link_path; 1858 char *translated = NULL; 1859 char *target_start; 1860 int copy_len; 1861 1862 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); 1863 if (!link_path_buffer) { 1864 err = -ENOMEM; 1865 goto out; 1866 } 1867 /* Get link path, relative to mount point */ 1868 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); 1869 if (IS_ERR(link_path)) { 1870 ntfs_err(sb, "Error getting link path"); 1871 err = -EINVAL; 1872 goto out; 1873 } 1874 1875 translated = kmalloc(PATH_MAX, GFP_NOFS); 1876 if (!translated) { 1877 err = -ENOMEM; 1878 goto out; 1879 } 1880 1881 /* Make translated path a relative path to mount point */ 1882 strcpy(translated, "./"); 1883 ++link_path; /* Skip leading / */ 1884 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) { 1885 if (*link_path == '/') { 1886 if (PATH_MAX - tl_len < sizeof("../")) { 1887 ntfs_err(sb, 1888 "Link path %s has too many components", 1889 link_path); 1890 err = -EINVAL; 1891 goto out; 1892 } 1893 strcpy(translated + tl_len, "../"); 1894 tl_len += sizeof("../") - 1; 1895 } 1896 } 1897 1898 /* Skip drive letter */ 1899 target_start = target; 1900 while (*target_start && *target_start != ':') 1901 ++target_start; 1902 1903 if (!*target_start) { 1904 ntfs_err(sb, "Link target (%s) missing drive separator", 1905 target); 1906 err = -EINVAL; 1907 goto out; 1908 } 1909 1910 /* Skip drive separator and leading /, if exists */ 1911 target_start += 1 + (target_start[1] == '/'); 1912 copy_len = target_len - (target_start - target); 1913 1914 if (PATH_MAX - tl_len <= copy_len) { 1915 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)", 1916 target_start, PATH_MAX - tl_len, copy_len); 1917 err = -EINVAL; 1918 goto out; 1919 } 1920 1921 /* translated path has a trailing / and target_start does not */ 1922 strcpy(translated + tl_len, target_start); 1923 tl_len += copy_len; 1924 if (target_max <= tl_len) { 1925 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)", 1926 translated, target_max, tl_len); 1927 err = -EINVAL; 1928 goto out; 1929 } 1930 strcpy(target, translated); 1931 err = tl_len; 1932 1933 out: 1934 kfree(link_path_buffer); 1935 kfree(translated); 1936 return err; 1937 } 1938 1939 static noinline int ntfs_readlink_hlp(const struct dentry *link_de, 1940 struct inode *inode, char *buffer, 1941 int buflen) 1942 { 1943 int i, err = -EINVAL; 1944 struct ntfs_inode *ni = ntfs_i(inode); 1945 struct super_block *sb = inode->i_sb; 1946 struct ntfs_sb_info *sbi = sb->s_fs_info; 1947 u64 size; 1948 u16 ulen = 0; 1949 void *to_free = NULL; 1950 struct REPARSE_DATA_BUFFER *rp; 1951 const __le16 *uname; 1952 struct ATTRIB *attr; 1953 1954 /* Reparse data present. Try to parse it. */ 1955 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1956 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1957 1958 *buffer = 0; 1959 1960 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1961 if (!attr) 1962 goto out; 1963 1964 if (!attr->non_res) { 1965 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1966 if (!rp) 1967 goto out; 1968 size = le32_to_cpu(attr->res.data_size); 1969 } else { 1970 size = le64_to_cpu(attr->nres.data_size); 1971 rp = NULL; 1972 } 1973 1974 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1975 goto out; 1976 1977 if (!rp) { 1978 rp = kmalloc(size, GFP_NOFS); 1979 if (!rp) { 1980 err = -ENOMEM; 1981 goto out; 1982 } 1983 to_free = rp; 1984 /* Read into temporal buffer. */ 1985 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1986 if (err) 1987 goto out; 1988 } 1989 1990 /* Microsoft Tag. */ 1991 switch (rp->ReparseTag) { 1992 case IO_REPARSE_TAG_MOUNT_POINT: 1993 /* Mount points and junctions. */ 1994 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1995 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1996 MountPointReparseBuffer.PathBuffer)) 1997 goto out; 1998 uname = Add2Ptr(rp, 1999 offsetof(struct REPARSE_DATA_BUFFER, 2000 MountPointReparseBuffer.PathBuffer) + 2001 le16_to_cpu(rp->MountPointReparseBuffer 2002 .PrintNameOffset)); 2003 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 2004 break; 2005 2006 case IO_REPARSE_TAG_SYMLINK: 2007 /* FolderSymbolicLink */ 2008 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 2009 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 2010 SymbolicLinkReparseBuffer.PathBuffer)) 2011 goto out; 2012 uname = Add2Ptr( 2013 rp, offsetof(struct REPARSE_DATA_BUFFER, 2014 SymbolicLinkReparseBuffer.PathBuffer) + 2015 le16_to_cpu(rp->SymbolicLinkReparseBuffer 2016 .PrintNameOffset)); 2017 ulen = le16_to_cpu( 2018 rp->SymbolicLinkReparseBuffer.PrintNameLength); 2019 break; 2020 2021 case IO_REPARSE_TAG_CLOUD: 2022 case IO_REPARSE_TAG_CLOUD_1: 2023 case IO_REPARSE_TAG_CLOUD_2: 2024 case IO_REPARSE_TAG_CLOUD_3: 2025 case IO_REPARSE_TAG_CLOUD_4: 2026 case IO_REPARSE_TAG_CLOUD_5: 2027 case IO_REPARSE_TAG_CLOUD_6: 2028 case IO_REPARSE_TAG_CLOUD_7: 2029 case IO_REPARSE_TAG_CLOUD_8: 2030 case IO_REPARSE_TAG_CLOUD_9: 2031 case IO_REPARSE_TAG_CLOUD_A: 2032 case IO_REPARSE_TAG_CLOUD_B: 2033 case IO_REPARSE_TAG_CLOUD_C: 2034 case IO_REPARSE_TAG_CLOUD_D: 2035 case IO_REPARSE_TAG_CLOUD_E: 2036 case IO_REPARSE_TAG_CLOUD_F: 2037 err = sizeof("OneDrive") - 1; 2038 if (err > buflen) 2039 err = buflen; 2040 memcpy(buffer, "OneDrive", err); 2041 goto out; 2042 2043 default: 2044 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 2045 /* Unknown Microsoft Tag. */ 2046 goto out; 2047 } 2048 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 2049 size <= sizeof(struct REPARSE_POINT)) { 2050 goto out; 2051 } 2052 2053 /* Users tag. */ 2054 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 2055 ulen = le16_to_cpu(rp->ReparseDataLength) - 2056 sizeof(struct REPARSE_POINT); 2057 } 2058 2059 /* Convert nlen from bytes to UNICODE chars. */ 2060 ulen >>= 1; 2061 2062 /* Check that name is available. */ 2063 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 2064 goto out; 2065 2066 /* If name is already zero terminated then truncate it now. */ 2067 if (!uname[ulen - 1]) 2068 ulen -= 1; 2069 2070 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 2071 2072 if (err < 0) 2073 goto out; 2074 2075 /* Translate Windows '\' into Linux '/'. */ 2076 for (i = 0; i < err; i++) { 2077 if (buffer[i] == '\\') 2078 buffer[i] = '/'; 2079 } 2080 2081 /* Always set last zero. */ 2082 buffer[err] = 0; 2083 2084 /* If this is a junction, translate the link target. */ 2085 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) 2086 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen); 2087 2088 out: 2089 kfree(to_free); 2090 return err; 2091 } 2092 2093 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 2094 struct delayed_call *done) 2095 { 2096 int err; 2097 char *ret; 2098 2099 if (!de) 2100 return ERR_PTR(-ECHILD); 2101 2102 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 2103 if (!ret) 2104 return ERR_PTR(-ENOMEM); 2105 2106 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE); 2107 if (err < 0) { 2108 kfree(ret); 2109 return ERR_PTR(err); 2110 } 2111 2112 set_delayed_call(done, kfree_link, ret); 2113 2114 return ret; 2115 } 2116 2117 // clang-format off 2118 const struct inode_operations ntfs_link_inode_operations = { 2119 .get_link = ntfs_get_link, 2120 .setattr = ntfs3_setattr, 2121 .listxattr = ntfs_listxattr, 2122 }; 2123 2124 const struct address_space_operations ntfs_aops = { 2125 .read_folio = ntfs_read_folio, 2126 .readahead = ntfs_readahead, 2127 .writepages = ntfs_writepages, 2128 .write_begin = ntfs_write_begin, 2129 .write_end = ntfs_write_end, 2130 .direct_IO = ntfs_direct_IO, 2131 .bmap = ntfs_bmap, 2132 .dirty_folio = block_dirty_folio, 2133 .migrate_folio = buffer_migrate_folio, 2134 .invalidate_folio = block_invalidate_folio, 2135 }; 2136 2137 const struct address_space_operations ntfs_aops_cmpr = { 2138 .read_folio = ntfs_read_folio, 2139 .readahead = ntfs_readahead, 2140 .dirty_folio = block_dirty_folio, 2141 }; 2142 // clang-format on 2143