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 folio **foliop, 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 if (is_resident(ni)) { 914 struct folio *folio = __filemap_get_folio( 915 mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN, 916 mapping_gfp_mask(mapping)); 917 918 if (IS_ERR(folio)) { 919 err = PTR_ERR(folio); 920 goto out; 921 } 922 923 ni_lock(ni); 924 err = attr_data_read_resident(ni, folio); 925 ni_unlock(ni); 926 927 if (!err) { 928 *foliop = folio; 929 goto out; 930 } 931 folio_unlock(folio); 932 folio_put(folio); 933 934 if (err != E_NTFS_NONRESIDENT) 935 goto out; 936 } 937 938 err = block_write_begin(mapping, pos, len, foliop, 939 ntfs_get_block_write_begin); 940 941 out: 942 return err; 943 } 944 945 /* 946 * ntfs_write_end - Address_space_operations::write_end. 947 */ 948 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, 949 u32 len, u32 copied, struct folio *folio, void *fsdata) 950 { 951 struct inode *inode = mapping->host; 952 struct ntfs_inode *ni = ntfs_i(inode); 953 u64 valid = ni->i_valid; 954 bool dirty = false; 955 int err; 956 957 if (is_resident(ni)) { 958 ni_lock(ni); 959 err = attr_data_write_resident(ni, folio); 960 ni_unlock(ni); 961 if (!err) { 962 struct buffer_head *head = folio_buffers(folio); 963 dirty = true; 964 /* Clear any buffers in folio. */ 965 if (head) { 966 struct buffer_head *bh = head; 967 968 do { 969 clear_buffer_dirty(bh); 970 clear_buffer_mapped(bh); 971 set_buffer_uptodate(bh); 972 } while (head != (bh = bh->b_this_page)); 973 } 974 folio_mark_uptodate(folio); 975 err = copied; 976 } 977 folio_unlock(folio); 978 folio_put(folio); 979 } else { 980 err = generic_write_end(file, mapping, pos, len, copied, folio, 981 fsdata); 982 } 983 984 if (err >= 0) { 985 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 986 inode_set_mtime_to_ts(inode, 987 inode_set_ctime_current(inode)); 988 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 989 dirty = true; 990 } 991 992 if (valid != ni->i_valid) { 993 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 994 dirty = true; 995 } 996 997 if (pos + err > inode->i_size) { 998 i_size_write(inode, pos + err); 999 dirty = true; 1000 } 1001 1002 if (dirty) 1003 mark_inode_dirty(inode); 1004 } 1005 1006 return err; 1007 } 1008 1009 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1010 { 1011 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1012 } 1013 1014 int ntfs_sync_inode(struct inode *inode) 1015 { 1016 return _ni_write_inode(inode, 1); 1017 } 1018 1019 /* 1020 * writeback_inode - Helper function for ntfs_flush_inodes(). 1021 * 1022 * This writes both the inode and the file data blocks, waiting 1023 * for in flight data blocks before the start of the call. It 1024 * does not wait for any io started during the call. 1025 */ 1026 static int writeback_inode(struct inode *inode) 1027 { 1028 int ret = sync_inode_metadata(inode, 0); 1029 1030 if (!ret) 1031 ret = filemap_fdatawrite(inode->i_mapping); 1032 return ret; 1033 } 1034 1035 /* 1036 * ntfs_flush_inodes 1037 * 1038 * Write data and metadata corresponding to i1 and i2. The io is 1039 * started but we do not wait for any of it to finish. 1040 * 1041 * filemap_flush() is used for the block device, so if there is a dirty 1042 * page for a block already in flight, we will not wait and start the 1043 * io over again. 1044 */ 1045 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1046 struct inode *i2) 1047 { 1048 int ret = 0; 1049 1050 if (i1) 1051 ret = writeback_inode(i1); 1052 if (!ret && i2) 1053 ret = writeback_inode(i2); 1054 if (!ret) 1055 ret = filemap_flush(sb->s_bdev_file->f_mapping); 1056 return ret; 1057 } 1058 1059 /* 1060 * Helper function to read file. 1061 */ 1062 int inode_read_data(struct inode *inode, void *data, size_t bytes) 1063 { 1064 pgoff_t idx; 1065 struct address_space *mapping = inode->i_mapping; 1066 1067 for (idx = 0; bytes; idx++) { 1068 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1069 struct page *page = read_mapping_page(mapping, idx, NULL); 1070 void *kaddr; 1071 1072 if (IS_ERR(page)) 1073 return PTR_ERR(page); 1074 1075 kaddr = kmap_atomic(page); 1076 memcpy(data, kaddr, op); 1077 kunmap_atomic(kaddr); 1078 1079 put_page(page); 1080 1081 bytes -= op; 1082 data = Add2Ptr(data, PAGE_SIZE); 1083 } 1084 return 0; 1085 } 1086 1087 /* 1088 * ntfs_reparse_bytes 1089 * 1090 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1091 * for unicode string of @uni_len length. 1092 */ 1093 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1094 { 1095 /* Header + unicode string + decorated unicode string. */ 1096 return sizeof(short) * (2 * uni_len + 4) + 1097 offsetof(struct REPARSE_DATA_BUFFER, 1098 SymbolicLinkReparseBuffer.PathBuffer); 1099 } 1100 1101 static struct REPARSE_DATA_BUFFER * 1102 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1103 u32 size, u16 *nsize) 1104 { 1105 int i, err; 1106 struct REPARSE_DATA_BUFFER *rp; 1107 __le16 *rp_name; 1108 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1109 1110 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1111 if (!rp) 1112 return ERR_PTR(-ENOMEM); 1113 1114 rs = &rp->SymbolicLinkReparseBuffer; 1115 rp_name = rs->PathBuffer; 1116 1117 /* Convert link name to UTF-16. */ 1118 err = ntfs_nls_to_utf16(sbi, symname, size, 1119 (struct cpu_str *)(rp_name - 1), 2 * size, 1120 UTF16_LITTLE_ENDIAN); 1121 if (err < 0) 1122 goto out; 1123 1124 /* err = the length of unicode name of symlink. */ 1125 *nsize = ntfs_reparse_bytes(err); 1126 1127 if (*nsize > sbi->reparse.max_size) { 1128 err = -EFBIG; 1129 goto out; 1130 } 1131 1132 /* Translate Linux '/' into Windows '\'. */ 1133 for (i = 0; i < err; i++) { 1134 if (rp_name[i] == cpu_to_le16('/')) 1135 rp_name[i] = cpu_to_le16('\\'); 1136 } 1137 1138 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1139 rp->ReparseDataLength = 1140 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1141 SymbolicLinkReparseBuffer)); 1142 1143 /* PrintName + SubstituteName. */ 1144 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1145 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1146 rs->PrintNameLength = rs->SubstituteNameOffset; 1147 1148 /* 1149 * TODO: Use relative path if possible to allow Windows to 1150 * parse this path. 1151 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1152 */ 1153 rs->Flags = 0; 1154 1155 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1156 1157 /* Decorate SubstituteName. */ 1158 rp_name += err; 1159 rp_name[0] = cpu_to_le16('\\'); 1160 rp_name[1] = cpu_to_le16('?'); 1161 rp_name[2] = cpu_to_le16('?'); 1162 rp_name[3] = cpu_to_le16('\\'); 1163 1164 return rp; 1165 out: 1166 kfree(rp); 1167 return ERR_PTR(err); 1168 } 1169 1170 /* 1171 * ntfs_create_inode 1172 * 1173 * Helper function for: 1174 * - ntfs_create 1175 * - ntfs_mknod 1176 * - ntfs_symlink 1177 * - ntfs_mkdir 1178 * - ntfs_atomic_open 1179 * 1180 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked 1181 */ 1182 int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, 1183 struct dentry *dentry, const struct cpu_str *uni, 1184 umode_t mode, dev_t dev, const char *symname, u32 size, 1185 struct ntfs_fnd *fnd) 1186 { 1187 int err; 1188 struct super_block *sb = dir->i_sb; 1189 struct ntfs_sb_info *sbi = sb->s_fs_info; 1190 const struct qstr *name = &dentry->d_name; 1191 CLST ino = 0; 1192 struct ntfs_inode *dir_ni = ntfs_i(dir); 1193 struct ntfs_inode *ni = NULL; 1194 struct inode *inode = NULL; 1195 struct ATTRIB *attr; 1196 struct ATTR_STD_INFO5 *std5; 1197 struct ATTR_FILE_NAME *fname; 1198 struct MFT_REC *rec; 1199 u32 asize, dsize, sd_size; 1200 enum FILE_ATTRIBUTE fa; 1201 __le32 security_id = SECURITY_ID_INVALID; 1202 CLST vcn; 1203 const void *sd; 1204 u16 t16, nsize = 0, aid = 0; 1205 struct INDEX_ROOT *root, *dir_root; 1206 struct NTFS_DE *e, *new_de = NULL; 1207 struct REPARSE_DATA_BUFFER *rp = NULL; 1208 bool rp_inserted = false; 1209 1210 /* New file will be resident or non resident. */ 1211 const bool new_file_resident = 1; 1212 1213 if (!fnd) 1214 ni_lock_dir(dir_ni); 1215 1216 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1217 if (!dir_root) { 1218 err = -EINVAL; 1219 goto out1; 1220 } 1221 1222 if (S_ISDIR(mode)) { 1223 /* Use parent's directory attributes. */ 1224 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1225 FILE_ATTRIBUTE_ARCHIVE; 1226 /* 1227 * By default child directory inherits parent attributes. 1228 * Root directory is hidden + system. 1229 * Make an exception for children in root. 1230 */ 1231 if (dir->i_ino == MFT_REC_ROOT) 1232 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1233 } else if (S_ISLNK(mode)) { 1234 /* It is good idea that link should be the same type (file/dir) as target */ 1235 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1236 1237 /* 1238 * Linux: there are dir/file/symlink and so on. 1239 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1240 * It is good idea to create: 1241 * dir + reparse if 'symname' points to directory 1242 * or 1243 * file + reparse if 'symname' points to file 1244 * Unfortunately kern_path hangs if symname contains 'dir'. 1245 */ 1246 1247 /* 1248 * struct path path; 1249 * 1250 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1251 * struct inode *target = d_inode(path.dentry); 1252 * 1253 * if (S_ISDIR(target->i_mode)) 1254 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1255 * // if ( target->i_sb == sb ){ 1256 * // use relative path? 1257 * // } 1258 * path_put(&path); 1259 * } 1260 */ 1261 } else if (S_ISREG(mode)) { 1262 if (sbi->options->sparse) { 1263 /* Sparsed regular file, cause option 'sparse'. */ 1264 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1265 FILE_ATTRIBUTE_ARCHIVE; 1266 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1267 /* Compressed regular file, if parent is compressed. */ 1268 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1269 } else { 1270 /* Regular file, default attributes. */ 1271 fa = FILE_ATTRIBUTE_ARCHIVE; 1272 } 1273 } else { 1274 fa = FILE_ATTRIBUTE_ARCHIVE; 1275 } 1276 1277 /* If option "hide_dot_files" then set hidden attribute for dot files. */ 1278 if (sbi->options->hide_dot_files && name->name[0] == '.') 1279 fa |= FILE_ATTRIBUTE_HIDDEN; 1280 1281 if (!(mode & 0222)) 1282 fa |= FILE_ATTRIBUTE_READONLY; 1283 1284 /* Allocate PATH_MAX bytes. */ 1285 new_de = __getname(); 1286 if (!new_de) { 1287 err = -ENOMEM; 1288 goto out1; 1289 } 1290 1291 if (unlikely(ntfs3_forced_shutdown(sb))) { 1292 err = -EIO; 1293 goto out2; 1294 } 1295 1296 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1297 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1298 1299 /* Step 1: allocate and fill new mft record. */ 1300 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1301 if (err) 1302 goto out2; 1303 1304 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); 1305 if (IS_ERR(ni)) { 1306 err = PTR_ERR(ni); 1307 ni = NULL; 1308 goto out3; 1309 } 1310 inode = &ni->vfs_inode; 1311 inode_init_owner(idmap, inode, dir, mode); 1312 mode = inode->i_mode; 1313 1314 ni->i_crtime = current_time(inode); 1315 1316 rec = ni->mi.mrec; 1317 rec->hard_links = cpu_to_le16(1); 1318 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1319 1320 /* Get default security id. */ 1321 sd = s_default_security; 1322 sd_size = sizeof(s_default_security); 1323 1324 if (is_ntfs3(sbi)) { 1325 security_id = dir_ni->std_security_id; 1326 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1327 security_id = sbi->security.def_security_id; 1328 1329 if (security_id == SECURITY_ID_INVALID && 1330 !ntfs_insert_security(sbi, sd, sd_size, 1331 &security_id, NULL)) 1332 sbi->security.def_security_id = security_id; 1333 } 1334 } 1335 1336 /* Insert standard info. */ 1337 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1338 1339 if (security_id == SECURITY_ID_INVALID) { 1340 dsize = sizeof(struct ATTR_STD_INFO); 1341 } else { 1342 dsize = sizeof(struct ATTR_STD_INFO5); 1343 std5->security_id = security_id; 1344 ni->std_security_id = security_id; 1345 } 1346 asize = SIZEOF_RESIDENT + dsize; 1347 1348 attr->type = ATTR_STD; 1349 attr->size = cpu_to_le32(asize); 1350 attr->id = cpu_to_le16(aid++); 1351 attr->res.data_off = SIZEOF_RESIDENT_LE; 1352 attr->res.data_size = cpu_to_le32(dsize); 1353 1354 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1355 kernel2nt(&ni->i_crtime); 1356 1357 std5->fa = ni->std_fa = fa; 1358 1359 attr = Add2Ptr(attr, asize); 1360 1361 /* Insert file name. */ 1362 err = fill_name_de(sbi, new_de, name, uni); 1363 if (err) 1364 goto out4; 1365 1366 mi_get_ref(&ni->mi, &new_de->ref); 1367 1368 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1369 1370 if (sbi->options->windows_names && 1371 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) { 1372 err = -EINVAL; 1373 goto out4; 1374 } 1375 1376 mi_get_ref(&dir_ni->mi, &fname->home); 1377 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1378 fname->dup.a_time = std5->cr_time; 1379 fname->dup.alloc_size = fname->dup.data_size = 0; 1380 fname->dup.fa = std5->fa; 1381 fname->dup.ea_size = fname->dup.reparse = 0; 1382 1383 dsize = le16_to_cpu(new_de->key_size); 1384 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1385 1386 attr->type = ATTR_NAME; 1387 attr->size = cpu_to_le32(asize); 1388 attr->res.data_off = SIZEOF_RESIDENT_LE; 1389 attr->res.flags = RESIDENT_FLAG_INDEXED; 1390 attr->id = cpu_to_le16(aid++); 1391 attr->res.data_size = cpu_to_le32(dsize); 1392 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1393 1394 attr = Add2Ptr(attr, asize); 1395 1396 if (security_id == SECURITY_ID_INVALID) { 1397 /* Insert security attribute. */ 1398 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1399 1400 attr->type = ATTR_SECURE; 1401 attr->size = cpu_to_le32(asize); 1402 attr->id = cpu_to_le16(aid++); 1403 attr->res.data_off = SIZEOF_RESIDENT_LE; 1404 attr->res.data_size = cpu_to_le32(sd_size); 1405 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1406 1407 attr = Add2Ptr(attr, asize); 1408 } 1409 1410 attr->id = cpu_to_le16(aid++); 1411 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1412 /* 1413 * Regular directory or symlink to directory. 1414 * Create root attribute. 1415 */ 1416 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1417 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1418 1419 attr->type = ATTR_ROOT; 1420 attr->size = cpu_to_le32(asize); 1421 1422 attr->name_len = ARRAY_SIZE(I30_NAME); 1423 attr->name_off = SIZEOF_RESIDENT_LE; 1424 attr->res.data_off = 1425 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1426 attr->res.data_size = cpu_to_le32(dsize); 1427 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1428 sizeof(I30_NAME)); 1429 1430 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1431 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1432 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); 1433 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1434 sizeof(struct NTFS_DE)); 1435 root->ihdr.total = root->ihdr.used; 1436 1437 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1438 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1439 e->flags = NTFS_IE_LAST; 1440 } else if (S_ISLNK(mode)) { 1441 /* 1442 * Symlink to file. 1443 * Create empty resident data attribute. 1444 */ 1445 asize = SIZEOF_RESIDENT; 1446 1447 /* Insert empty ATTR_DATA */ 1448 attr->type = ATTR_DATA; 1449 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1450 attr->name_off = SIZEOF_RESIDENT_LE; 1451 attr->res.data_off = SIZEOF_RESIDENT_LE; 1452 } else if (!new_file_resident && S_ISREG(mode)) { 1453 /* 1454 * Regular file. Create empty non resident data attribute. 1455 */ 1456 attr->type = ATTR_DATA; 1457 attr->non_res = 1; 1458 attr->nres.evcn = cpu_to_le64(-1ll); 1459 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1460 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1461 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1462 attr->flags = ATTR_FLAG_SPARSED; 1463 asize = SIZEOF_NONRESIDENT_EX + 8; 1464 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1465 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1466 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1467 attr->flags = ATTR_FLAG_COMPRESSED; 1468 attr->nres.c_unit = NTFS_LZNT_CUNIT; 1469 asize = SIZEOF_NONRESIDENT_EX + 8; 1470 } else { 1471 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1472 attr->name_off = SIZEOF_NONRESIDENT_LE; 1473 asize = SIZEOF_NONRESIDENT + 8; 1474 } 1475 attr->nres.run_off = attr->name_off; 1476 } else { 1477 /* 1478 * Node. Create empty resident data attribute. 1479 */ 1480 attr->type = ATTR_DATA; 1481 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1482 attr->name_off = SIZEOF_RESIDENT_LE; 1483 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1484 attr->flags = ATTR_FLAG_SPARSED; 1485 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1486 attr->flags = ATTR_FLAG_COMPRESSED; 1487 attr->res.data_off = SIZEOF_RESIDENT_LE; 1488 asize = SIZEOF_RESIDENT; 1489 ni->ni_flags |= NI_FLAG_RESIDENT; 1490 } 1491 1492 if (S_ISDIR(mode)) { 1493 ni->ni_flags |= NI_FLAG_DIR; 1494 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1495 if (err) 1496 goto out4; 1497 } else if (S_ISLNK(mode)) { 1498 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1499 1500 if (IS_ERR(rp)) { 1501 err = PTR_ERR(rp); 1502 rp = NULL; 1503 goto out4; 1504 } 1505 1506 /* 1507 * Insert ATTR_REPARSE. 1508 */ 1509 attr = Add2Ptr(attr, asize); 1510 attr->type = ATTR_REPARSE; 1511 attr->id = cpu_to_le16(aid++); 1512 1513 /* Resident or non resident? */ 1514 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1515 t16 = PtrOffset(rec, attr); 1516 1517 /* 1518 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1519 * It is good idea to keep extended attributes resident. 1520 */ 1521 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1522 CLST alen; 1523 CLST clst = bytes_to_cluster(sbi, nsize); 1524 1525 /* Bytes per runs. */ 1526 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1527 1528 attr->non_res = 1; 1529 attr->nres.evcn = cpu_to_le64(clst - 1); 1530 attr->name_off = SIZEOF_NONRESIDENT_LE; 1531 attr->nres.run_off = attr->name_off; 1532 attr->nres.data_size = cpu_to_le64(nsize); 1533 attr->nres.valid_size = attr->nres.data_size; 1534 attr->nres.alloc_size = 1535 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1536 1537 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1538 clst, NULL, ALLOCATE_DEF, 1539 &alen, 0, NULL, NULL); 1540 if (err) 1541 goto out5; 1542 1543 err = run_pack(&ni->file.run, 0, clst, 1544 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1545 &vcn); 1546 if (err < 0) 1547 goto out5; 1548 1549 if (vcn != clst) { 1550 err = -EINVAL; 1551 goto out5; 1552 } 1553 1554 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1555 /* Write non resident data. */ 1556 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, 1557 nsize, 0); 1558 if (err) 1559 goto out5; 1560 } else { 1561 attr->res.data_off = SIZEOF_RESIDENT_LE; 1562 attr->res.data_size = cpu_to_le32(nsize); 1563 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1564 } 1565 /* Size of symlink equals the length of input string. */ 1566 inode->i_size = size; 1567 1568 attr->size = cpu_to_le32(asize); 1569 1570 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1571 &new_de->ref); 1572 if (err) 1573 goto out5; 1574 1575 rp_inserted = true; 1576 } 1577 1578 attr = Add2Ptr(attr, asize); 1579 attr->type = ATTR_END; 1580 1581 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1582 rec->next_attr_id = cpu_to_le16(aid); 1583 1584 inode->i_generation = le16_to_cpu(rec->seq); 1585 1586 if (S_ISDIR(mode)) { 1587 inode->i_op = &ntfs_dir_inode_operations; 1588 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 1589 &ntfs_legacy_dir_operations : 1590 &ntfs_dir_operations; 1591 } else if (S_ISLNK(mode)) { 1592 inode->i_op = &ntfs_link_inode_operations; 1593 inode->i_fop = NULL; 1594 inode->i_mapping->a_ops = &ntfs_aops; 1595 inode->i_size = size; 1596 inode_nohighmem(inode); 1597 } else if (S_ISREG(mode)) { 1598 inode->i_op = &ntfs_file_inode_operations; 1599 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 1600 &ntfs_legacy_file_operations : 1601 &ntfs_file_operations; 1602 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 1603 &ntfs_aops; 1604 init_rwsem(&ni->file.run_lock); 1605 } else { 1606 inode->i_op = &ntfs_special_inode_operations; 1607 init_special_inode(inode, mode, dev); 1608 } 1609 1610 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1611 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1612 err = ntfs_init_acl(idmap, inode, dir); 1613 if (err) 1614 goto out5; 1615 } else 1616 #endif 1617 { 1618 inode->i_flags |= S_NOSEC; 1619 } 1620 1621 /* 1622 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. 1623 * The packed size of extended attribute is stored in direntry too. 1624 * 'fname' here points to inside new_de. 1625 */ 1626 err = ntfs_save_wsl_perm(inode, &fname->dup.ea_size); 1627 if (err) 1628 goto out6; 1629 1630 /* 1631 * update ea_size in file_name attribute too. 1632 * Use ni_find_attr cause layout of MFT record may be changed 1633 * in ntfs_init_acl and ntfs_save_wsl_perm. 1634 */ 1635 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL); 1636 if (attr) { 1637 struct ATTR_FILE_NAME *fn; 1638 1639 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1640 if (fn) 1641 fn->dup.ea_size = fname->dup.ea_size; 1642 } 1643 1644 /* We do not need to update parent directory later */ 1645 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; 1646 1647 /* Step 2: Add new name in index. */ 1648 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1649 if (err) 1650 goto out6; 1651 1652 /* 1653 * Call 'd_instantiate' after inode->i_op is set 1654 * but before finish_open. 1655 */ 1656 d_instantiate(dentry, inode); 1657 1658 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ 1659 inode_set_atime_to_ts(inode, ni->i_crtime); 1660 inode_set_ctime_to_ts(inode, ni->i_crtime); 1661 inode_set_mtime_to_ts(inode, ni->i_crtime); 1662 inode_set_mtime_to_ts(dir, ni->i_crtime); 1663 inode_set_ctime_to_ts(dir, ni->i_crtime); 1664 1665 mark_inode_dirty(dir); 1666 mark_inode_dirty(inode); 1667 1668 /* Normal exit. */ 1669 goto out2; 1670 1671 out6: 1672 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL); 1673 if (attr && attr->non_res) { 1674 /* Delete ATTR_EA, if non-resident. */ 1675 attr_set_size(ni, ATTR_EA, NULL, 0, NULL, 0, NULL, false, NULL); 1676 } 1677 1678 if (rp_inserted) 1679 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1680 1681 out5: 1682 if (!S_ISDIR(mode)) 1683 run_deallocate(sbi, &ni->file.run, false); 1684 1685 out4: 1686 clear_rec_inuse(rec); 1687 clear_nlink(inode); 1688 ni->mi.dirty = false; 1689 discard_new_inode(inode); 1690 out3: 1691 ntfs_mark_rec_free(sbi, ino, false); 1692 1693 out2: 1694 __putname(new_de); 1695 kfree(rp); 1696 1697 out1: 1698 if (!fnd) 1699 ni_unlock(dir_ni); 1700 1701 if (!err) 1702 unlock_new_inode(inode); 1703 1704 return err; 1705 } 1706 1707 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1708 { 1709 int err; 1710 struct ntfs_inode *ni = ntfs_i(inode); 1711 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1712 struct NTFS_DE *de; 1713 1714 /* Allocate PATH_MAX bytes. */ 1715 de = __getname(); 1716 if (!de) 1717 return -ENOMEM; 1718 1719 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1720 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1721 1722 /* Construct 'de'. */ 1723 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1724 if (err) 1725 goto out; 1726 1727 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1728 out: 1729 __putname(de); 1730 return err; 1731 } 1732 1733 /* 1734 * ntfs_unlink_inode 1735 * 1736 * inode_operations::unlink 1737 * inode_operations::rmdir 1738 */ 1739 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1740 { 1741 int err; 1742 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1743 struct inode *inode = d_inode(dentry); 1744 struct ntfs_inode *ni = ntfs_i(inode); 1745 struct ntfs_inode *dir_ni = ntfs_i(dir); 1746 struct NTFS_DE *de, *de2 = NULL; 1747 int undo_remove; 1748 1749 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1750 return -EINVAL; 1751 1752 /* Allocate PATH_MAX bytes. */ 1753 de = __getname(); 1754 if (!de) 1755 return -ENOMEM; 1756 1757 ni_lock(ni); 1758 1759 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1760 err = -ENOTEMPTY; 1761 goto out; 1762 } 1763 1764 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1765 if (err < 0) 1766 goto out; 1767 1768 undo_remove = 0; 1769 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1770 1771 if (!err) { 1772 drop_nlink(inode); 1773 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 1774 mark_inode_dirty(dir); 1775 inode_set_ctime_to_ts(inode, inode_get_ctime(dir)); 1776 if (inode->i_nlink) 1777 mark_inode_dirty(inode); 1778 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1779 _ntfs_bad_inode(inode); 1780 } else { 1781 if (ni_is_dirty(dir)) 1782 mark_inode_dirty(dir); 1783 if (ni_is_dirty(inode)) 1784 mark_inode_dirty(inode); 1785 } 1786 1787 out: 1788 ni_unlock(ni); 1789 __putname(de); 1790 return err; 1791 } 1792 1793 void ntfs_evict_inode(struct inode *inode) 1794 { 1795 truncate_inode_pages_final(&inode->i_data); 1796 1797 invalidate_inode_buffers(inode); 1798 clear_inode(inode); 1799 1800 ni_clear(ntfs_i(inode)); 1801 } 1802 1803 /* 1804 * ntfs_translate_junction 1805 * 1806 * Translate a Windows junction target to the Linux equivalent. 1807 * On junctions, targets are always absolute (they include the drive 1808 * letter). We have no way of knowing if the target is for the current 1809 * mounted device or not so we just assume it is. 1810 */ 1811 static int ntfs_translate_junction(const struct super_block *sb, 1812 const struct dentry *link_de, char *target, 1813 int target_len, int target_max) 1814 { 1815 int tl_len, err = target_len; 1816 char *link_path_buffer = NULL, *link_path; 1817 char *translated = NULL; 1818 char *target_start; 1819 int copy_len; 1820 1821 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); 1822 if (!link_path_buffer) { 1823 err = -ENOMEM; 1824 goto out; 1825 } 1826 /* Get link path, relative to mount point */ 1827 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); 1828 if (IS_ERR(link_path)) { 1829 ntfs_err(sb, "Error getting link path"); 1830 err = -EINVAL; 1831 goto out; 1832 } 1833 1834 translated = kmalloc(PATH_MAX, GFP_NOFS); 1835 if (!translated) { 1836 err = -ENOMEM; 1837 goto out; 1838 } 1839 1840 /* Make translated path a relative path to mount point */ 1841 strcpy(translated, "./"); 1842 ++link_path; /* Skip leading / */ 1843 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) { 1844 if (*link_path == '/') { 1845 if (PATH_MAX - tl_len < sizeof("../")) { 1846 ntfs_err(sb, 1847 "Link path %s has too many components", 1848 link_path); 1849 err = -EINVAL; 1850 goto out; 1851 } 1852 strcpy(translated + tl_len, "../"); 1853 tl_len += sizeof("../") - 1; 1854 } 1855 } 1856 1857 /* Skip drive letter */ 1858 target_start = target; 1859 while (*target_start && *target_start != ':') 1860 ++target_start; 1861 1862 if (!*target_start) { 1863 ntfs_err(sb, "Link target (%s) missing drive separator", 1864 target); 1865 err = -EINVAL; 1866 goto out; 1867 } 1868 1869 /* Skip drive separator and leading /, if exists */ 1870 target_start += 1 + (target_start[1] == '/'); 1871 copy_len = target_len - (target_start - target); 1872 1873 if (PATH_MAX - tl_len <= copy_len) { 1874 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)", 1875 target_start, PATH_MAX - tl_len, copy_len); 1876 err = -EINVAL; 1877 goto out; 1878 } 1879 1880 /* translated path has a trailing / and target_start does not */ 1881 strcpy(translated + tl_len, target_start); 1882 tl_len += copy_len; 1883 if (target_max <= tl_len) { 1884 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)", 1885 translated, target_max, tl_len); 1886 err = -EINVAL; 1887 goto out; 1888 } 1889 strcpy(target, translated); 1890 err = tl_len; 1891 1892 out: 1893 kfree(link_path_buffer); 1894 kfree(translated); 1895 return err; 1896 } 1897 1898 static noinline int ntfs_readlink_hlp(const struct dentry *link_de, 1899 struct inode *inode, char *buffer, 1900 int buflen) 1901 { 1902 int i, err = -EINVAL; 1903 struct ntfs_inode *ni = ntfs_i(inode); 1904 struct super_block *sb = inode->i_sb; 1905 struct ntfs_sb_info *sbi = sb->s_fs_info; 1906 u64 size; 1907 u16 ulen = 0; 1908 void *to_free = NULL; 1909 struct REPARSE_DATA_BUFFER *rp; 1910 const __le16 *uname; 1911 struct ATTRIB *attr; 1912 1913 /* Reparse data present. Try to parse it. */ 1914 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1915 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1916 1917 *buffer = 0; 1918 1919 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1920 if (!attr) 1921 goto out; 1922 1923 if (!attr->non_res) { 1924 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1925 if (!rp) 1926 goto out; 1927 size = le32_to_cpu(attr->res.data_size); 1928 } else { 1929 size = le64_to_cpu(attr->nres.data_size); 1930 rp = NULL; 1931 } 1932 1933 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1934 goto out; 1935 1936 if (!rp) { 1937 rp = kmalloc(size, GFP_NOFS); 1938 if (!rp) { 1939 err = -ENOMEM; 1940 goto out; 1941 } 1942 to_free = rp; 1943 /* Read into temporal buffer. */ 1944 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1945 if (err) 1946 goto out; 1947 } 1948 1949 /* Microsoft Tag. */ 1950 switch (rp->ReparseTag) { 1951 case IO_REPARSE_TAG_MOUNT_POINT: 1952 /* Mount points and junctions. */ 1953 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1954 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1955 MountPointReparseBuffer.PathBuffer)) 1956 goto out; 1957 uname = Add2Ptr(rp, 1958 offsetof(struct REPARSE_DATA_BUFFER, 1959 MountPointReparseBuffer.PathBuffer) + 1960 le16_to_cpu(rp->MountPointReparseBuffer 1961 .PrintNameOffset)); 1962 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1963 break; 1964 1965 case IO_REPARSE_TAG_SYMLINK: 1966 /* FolderSymbolicLink */ 1967 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1968 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1969 SymbolicLinkReparseBuffer.PathBuffer)) 1970 goto out; 1971 uname = Add2Ptr( 1972 rp, offsetof(struct REPARSE_DATA_BUFFER, 1973 SymbolicLinkReparseBuffer.PathBuffer) + 1974 le16_to_cpu(rp->SymbolicLinkReparseBuffer 1975 .PrintNameOffset)); 1976 ulen = le16_to_cpu( 1977 rp->SymbolicLinkReparseBuffer.PrintNameLength); 1978 break; 1979 1980 case IO_REPARSE_TAG_CLOUD: 1981 case IO_REPARSE_TAG_CLOUD_1: 1982 case IO_REPARSE_TAG_CLOUD_2: 1983 case IO_REPARSE_TAG_CLOUD_3: 1984 case IO_REPARSE_TAG_CLOUD_4: 1985 case IO_REPARSE_TAG_CLOUD_5: 1986 case IO_REPARSE_TAG_CLOUD_6: 1987 case IO_REPARSE_TAG_CLOUD_7: 1988 case IO_REPARSE_TAG_CLOUD_8: 1989 case IO_REPARSE_TAG_CLOUD_9: 1990 case IO_REPARSE_TAG_CLOUD_A: 1991 case IO_REPARSE_TAG_CLOUD_B: 1992 case IO_REPARSE_TAG_CLOUD_C: 1993 case IO_REPARSE_TAG_CLOUD_D: 1994 case IO_REPARSE_TAG_CLOUD_E: 1995 case IO_REPARSE_TAG_CLOUD_F: 1996 err = sizeof("OneDrive") - 1; 1997 if (err > buflen) 1998 err = buflen; 1999 memcpy(buffer, "OneDrive", err); 2000 goto out; 2001 2002 default: 2003 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 2004 /* Unknown Microsoft Tag. */ 2005 goto out; 2006 } 2007 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 2008 size <= sizeof(struct REPARSE_POINT)) { 2009 goto out; 2010 } 2011 2012 /* Users tag. */ 2013 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 2014 ulen = le16_to_cpu(rp->ReparseDataLength) - 2015 sizeof(struct REPARSE_POINT); 2016 } 2017 2018 /* Convert nlen from bytes to UNICODE chars. */ 2019 ulen >>= 1; 2020 2021 /* Check that name is available. */ 2022 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 2023 goto out; 2024 2025 /* If name is already zero terminated then truncate it now. */ 2026 if (!uname[ulen - 1]) 2027 ulen -= 1; 2028 2029 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 2030 2031 if (err < 0) 2032 goto out; 2033 2034 /* Translate Windows '\' into Linux '/'. */ 2035 for (i = 0; i < err; i++) { 2036 if (buffer[i] == '\\') 2037 buffer[i] = '/'; 2038 } 2039 2040 /* Always set last zero. */ 2041 buffer[err] = 0; 2042 2043 /* If this is a junction, translate the link target. */ 2044 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) 2045 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen); 2046 2047 out: 2048 kfree(to_free); 2049 return err; 2050 } 2051 2052 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 2053 struct delayed_call *done) 2054 { 2055 int err; 2056 char *ret; 2057 2058 if (!de) 2059 return ERR_PTR(-ECHILD); 2060 2061 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 2062 if (!ret) 2063 return ERR_PTR(-ENOMEM); 2064 2065 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE); 2066 if (err < 0) { 2067 kfree(ret); 2068 return ERR_PTR(err); 2069 } 2070 2071 set_delayed_call(done, kfree_link, ret); 2072 2073 return ret; 2074 } 2075 2076 // clang-format off 2077 const struct inode_operations ntfs_link_inode_operations = { 2078 .get_link = ntfs_get_link, 2079 .setattr = ntfs3_setattr, 2080 .listxattr = ntfs_listxattr, 2081 }; 2082 2083 const struct address_space_operations ntfs_aops = { 2084 .read_folio = ntfs_read_folio, 2085 .readahead = ntfs_readahead, 2086 .writepages = ntfs_writepages, 2087 .write_begin = ntfs_write_begin, 2088 .write_end = ntfs_write_end, 2089 .direct_IO = ntfs_direct_IO, 2090 .bmap = ntfs_bmap, 2091 .dirty_folio = block_dirty_folio, 2092 .migrate_folio = buffer_migrate_folio, 2093 .invalidate_folio = block_invalidate_folio, 2094 }; 2095 2096 const struct address_space_operations ntfs_aops_cmpr = { 2097 .read_folio = ntfs_read_folio, 2098 .readahead = ntfs_readahead, 2099 .dirty_folio = block_dirty_folio, 2100 }; 2101 // clang-format on 2102