1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 */ 7 8 #include <linux/buffer_head.h> 9 #include <linux/fs.h> 10 #include <linux/mpage.h> 11 #include <linux/namei.h> 12 #include <linux/nls.h> 13 #include <linux/uio.h> 14 #include <linux/writeback.h> 15 16 #include "debug.h" 17 #include "ntfs.h" 18 #include "ntfs_fs.h" 19 20 /* 21 * ntfs_read_mft - Read record and parses MFT. 22 */ 23 static struct inode *ntfs_read_mft(struct inode *inode, 24 const struct cpu_str *name, 25 const struct MFT_REF *ref) 26 { 27 int err = 0; 28 struct ntfs_inode *ni = ntfs_i(inode); 29 struct super_block *sb = inode->i_sb; 30 struct ntfs_sb_info *sbi = sb->s_fs_info; 31 mode_t mode = 0; 32 struct ATTR_STD_INFO5 *std5 = NULL; 33 struct ATTR_LIST_ENTRY *le; 34 struct ATTRIB *attr; 35 bool is_match = false; 36 bool is_root = false; 37 bool is_dir; 38 unsigned long ino = inode->i_ino; 39 u32 rp_fa = 0, asize, t32; 40 u16 roff, rsize, names = 0; 41 const struct ATTR_FILE_NAME *fname = NULL; 42 const struct INDEX_ROOT *root; 43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes 44 u64 t64; 45 struct MFT_REC *rec; 46 struct runs_tree *run; 47 struct timespec64 ctime; 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, &inode->i_atime); 173 nt2kernel(std5->c_time, &ctime); 174 inode_set_ctime_to_ts(inode, ctime); 175 nt2kernel(std5->m_time, &inode->i_mtime); 176 177 ni->std_fa = std5->fa; 178 179 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && 180 rsize >= sizeof(struct ATTR_STD_INFO5)) 181 ni->std_security_id = std5->security_id; 182 goto next_attr; 183 184 case ATTR_LIST: 185 if (attr->name_len || le || ino == MFT_REC_LOG) 186 goto out; 187 188 err = ntfs_load_attr_list(ni, attr); 189 if (err) 190 goto out; 191 192 le = NULL; 193 attr = NULL; 194 goto next_attr; 195 196 case ATTR_NAME: 197 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || 198 rsize < SIZEOF_ATTRIBUTE_FILENAME) 199 goto out; 200 201 fname = Add2Ptr(attr, roff); 202 if (fname->type == FILE_NAME_DOS) 203 goto next_attr; 204 205 names += 1; 206 if (name && name->len == fname->name_len && 207 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, 208 NULL, false)) 209 is_match = true; 210 211 goto next_attr; 212 213 case ATTR_DATA: 214 if (is_dir) { 215 /* Ignore data attribute in dir record. */ 216 goto next_attr; 217 } 218 219 if (ino == MFT_REC_BADCLUST && !attr->non_res) 220 goto next_attr; 221 222 if (attr->name_len && 223 ((ino != MFT_REC_BADCLUST || !attr->non_res || 224 attr->name_len != ARRAY_SIZE(BAD_NAME) || 225 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && 226 (ino != MFT_REC_SECURE || !attr->non_res || 227 attr->name_len != ARRAY_SIZE(SDS_NAME) || 228 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { 229 /* File contains stream attribute. Ignore it. */ 230 goto next_attr; 231 } 232 233 if (is_attr_sparsed(attr)) 234 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; 235 else 236 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; 237 238 if (is_attr_compressed(attr)) 239 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; 240 else 241 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; 242 243 if (is_attr_encrypted(attr)) 244 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; 245 else 246 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; 247 248 if (!attr->non_res) { 249 ni->i_valid = inode->i_size = rsize; 250 inode_set_bytes(inode, rsize); 251 } 252 253 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); 254 255 if (!attr->non_res) { 256 ni->ni_flags |= NI_FLAG_RESIDENT; 257 goto next_attr; 258 } 259 260 inode_set_bytes(inode, attr_ondisk_size(attr)); 261 262 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 263 inode->i_size = le64_to_cpu(attr->nres.data_size); 264 if (!attr->nres.alloc_size) 265 goto next_attr; 266 267 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run : 268 &ni->file.run; 269 break; 270 271 case ATTR_ROOT: 272 if (attr->non_res) 273 goto out; 274 275 root = Add2Ptr(attr, roff); 276 277 if (attr->name_len != ARRAY_SIZE(I30_NAME) || 278 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 279 goto next_attr; 280 281 if (root->type != ATTR_NAME || 282 root->rule != NTFS_COLLATION_TYPE_FILENAME) 283 goto out; 284 285 if (!is_dir) 286 goto next_attr; 287 288 is_root = true; 289 ni->ni_flags |= NI_FLAG_DIR; 290 291 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 292 if (err) 293 goto out; 294 295 mode = sb->s_root ? 296 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) : 297 (S_IFDIR | 0777); 298 goto next_attr; 299 300 case ATTR_ALLOC: 301 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || 302 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 303 goto next_attr; 304 305 inode->i_size = le64_to_cpu(attr->nres.data_size); 306 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 307 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); 308 309 run = &ni->dir.alloc_run; 310 break; 311 312 case ATTR_BITMAP: 313 if (ino == MFT_REC_MFT) { 314 if (!attr->non_res) 315 goto out; 316 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 317 /* 0x20000000 = 2^32 / 8 */ 318 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) 319 goto out; 320 #endif 321 run = &sbi->mft.bitmap.run; 322 break; 323 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && 324 !memcmp(attr_name(attr), I30_NAME, 325 sizeof(I30_NAME)) && 326 attr->non_res) { 327 run = &ni->dir.bitmap_run; 328 break; 329 } 330 goto next_attr; 331 332 case ATTR_REPARSE: 333 if (attr->name_len) 334 goto next_attr; 335 336 rp_fa = ni_parse_reparse(ni, attr, &rp); 337 switch (rp_fa) { 338 case REPARSE_LINK: 339 /* 340 * Normal symlink. 341 * Assume one unicode symbol == one utf8. 342 */ 343 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer 344 .PrintNameLength) / 345 sizeof(u16); 346 347 ni->i_valid = inode->i_size; 348 349 /* Clear directory bit. */ 350 if (ni->ni_flags & NI_FLAG_DIR) { 351 indx_clear(&ni->dir); 352 memset(&ni->dir, 0, sizeof(ni->dir)); 353 ni->ni_flags &= ~NI_FLAG_DIR; 354 } else { 355 run_close(&ni->file.run); 356 } 357 mode = S_IFLNK | 0777; 358 is_dir = false; 359 if (attr->non_res) { 360 run = &ni->file.run; 361 goto attr_unpack_run; // Double break. 362 } 363 break; 364 365 case REPARSE_COMPRESSED: 366 break; 367 368 case REPARSE_DEDUPLICATED: 369 break; 370 } 371 goto next_attr; 372 373 case ATTR_EA_INFO: 374 if (!attr->name_len && 375 resident_data_ex(attr, sizeof(struct EA_INFO))) { 376 ni->ni_flags |= NI_FLAG_EA; 377 /* 378 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode 379 */ 380 inode->i_mode = mode; 381 ntfs_get_wsl_perm(inode); 382 mode = inode->i_mode; 383 } 384 goto next_attr; 385 386 default: 387 goto next_attr; 388 } 389 390 attr_unpack_run: 391 roff = le16_to_cpu(attr->nres.run_off); 392 393 if (roff > asize) { 394 err = -EINVAL; 395 goto out; 396 } 397 398 t64 = le64_to_cpu(attr->nres.svcn); 399 400 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), 401 t64, Add2Ptr(attr, roff), asize - roff); 402 if (err < 0) 403 goto out; 404 err = 0; 405 goto next_attr; 406 407 end_enum: 408 409 if (!std5) 410 goto out; 411 412 if (!is_match && name) { 413 err = -ENOENT; 414 goto out; 415 } 416 417 if (std5->fa & FILE_ATTRIBUTE_READONLY) 418 mode &= ~0222; 419 420 if (!names) { 421 err = -EINVAL; 422 goto out; 423 } 424 425 if (names != le16_to_cpu(rec->hard_links)) { 426 /* Correct minor error on the fly. Do not mark inode as dirty. */ 427 ntfs_inode_warn(inode, "Correct links count -> %u.", names); 428 rec->hard_links = cpu_to_le16(names); 429 ni->mi.dirty = true; 430 } 431 432 set_nlink(inode, names); 433 434 if (S_ISDIR(mode)) { 435 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; 436 437 /* 438 * Dot and dot-dot should be included in count but was not 439 * included in enumeration. 440 * Usually a hard links to directories are disabled. 441 */ 442 inode->i_op = &ntfs_dir_inode_operations; 443 inode->i_fop = &ntfs_dir_operations; 444 ni->i_valid = 0; 445 } else if (S_ISLNK(mode)) { 446 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 447 inode->i_op = &ntfs_link_inode_operations; 448 inode->i_fop = NULL; 449 inode_nohighmem(inode); 450 } else if (S_ISREG(mode)) { 451 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 452 inode->i_op = &ntfs_file_inode_operations; 453 inode->i_fop = &ntfs_file_operations; 454 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 455 &ntfs_aops; 456 if (ino != MFT_REC_MFT) 457 init_rwsem(&ni->file.run_lock); 458 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || 459 S_ISSOCK(mode)) { 460 inode->i_op = &ntfs_special_inode_operations; 461 init_special_inode(inode, mode, inode->i_rdev); 462 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && 463 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { 464 /* Records in $Extend are not a files or general directories. */ 465 inode->i_op = &ntfs_file_inode_operations; 466 } else { 467 err = -EINVAL; 468 goto out; 469 } 470 471 if ((sbi->options->sys_immutable && 472 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 473 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 474 inode->i_flags |= S_IMMUTABLE; 475 } else { 476 inode->i_flags &= ~S_IMMUTABLE; 477 } 478 479 inode->i_mode = mode; 480 if (!(ni->ni_flags & NI_FLAG_EA)) { 481 /* If no xattr then no security (stored in xattr). */ 482 inode->i_flags |= S_NOSEC; 483 } 484 485 if (ino == MFT_REC_MFT && !sb->s_root) 486 sbi->mft.ni = NULL; 487 488 unlock_new_inode(inode); 489 490 return inode; 491 492 out: 493 if (ino == MFT_REC_MFT && !sb->s_root) 494 sbi->mft.ni = NULL; 495 496 iget_failed(inode); 497 return ERR_PTR(err); 498 } 499 500 /* 501 * ntfs_test_inode 502 * 503 * Return: 1 if match. 504 */ 505 static int ntfs_test_inode(struct inode *inode, void *data) 506 { 507 struct MFT_REF *ref = data; 508 509 return ino_get(ref) == inode->i_ino; 510 } 511 512 static int ntfs_set_inode(struct inode *inode, void *data) 513 { 514 const struct MFT_REF *ref = data; 515 516 inode->i_ino = ino_get(ref); 517 return 0; 518 } 519 520 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 521 const struct cpu_str *name) 522 { 523 struct inode *inode; 524 525 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 526 (void *)ref); 527 if (unlikely(!inode)) 528 return ERR_PTR(-ENOMEM); 529 530 /* If this is a freshly allocated inode, need to read it now. */ 531 if (inode->i_state & I_NEW) 532 inode = ntfs_read_mft(inode, name, ref); 533 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 534 /* Inode overlaps? */ 535 _ntfs_bad_inode(inode); 536 } 537 538 if (IS_ERR(inode) && name) 539 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR); 540 541 return inode; 542 } 543 544 enum get_block_ctx { 545 GET_BLOCK_GENERAL = 0, 546 GET_BLOCK_WRITE_BEGIN = 1, 547 GET_BLOCK_DIRECT_IO_R = 2, 548 GET_BLOCK_DIRECT_IO_W = 3, 549 GET_BLOCK_BMAP = 4, 550 }; 551 552 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 553 struct buffer_head *bh, int create, 554 enum get_block_ctx ctx) 555 { 556 struct super_block *sb = inode->i_sb; 557 struct ntfs_sb_info *sbi = sb->s_fs_info; 558 struct ntfs_inode *ni = ntfs_i(inode); 559 struct folio *folio = bh->b_folio; 560 u8 cluster_bits = sbi->cluster_bits; 561 u32 block_size = sb->s_blocksize; 562 u64 bytes, lbo, valid; 563 u32 off; 564 int err; 565 CLST vcn, lcn, len; 566 bool new; 567 568 /* Clear previous state. */ 569 clear_buffer_new(bh); 570 clear_buffer_uptodate(bh); 571 572 if (is_resident(ni)) { 573 ni_lock(ni); 574 err = attr_data_read_resident(ni, &folio->page); 575 ni_unlock(ni); 576 577 if (!err) 578 set_buffer_uptodate(bh); 579 bh->b_size = block_size; 580 return err; 581 } 582 583 vcn = vbo >> cluster_bits; 584 off = vbo & sbi->cluster_mask; 585 new = false; 586 587 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL, 588 create && sbi->cluster_size > PAGE_SIZE); 589 if (err) 590 goto out; 591 592 if (!len) 593 return 0; 594 595 bytes = ((u64)len << cluster_bits) - off; 596 597 if (lcn == SPARSE_LCN) { 598 if (!create) { 599 if (bh->b_size > bytes) 600 bh->b_size = bytes; 601 return 0; 602 } 603 WARN_ON(1); 604 } 605 606 if (new) 607 set_buffer_new(bh); 608 609 lbo = ((u64)lcn << cluster_bits) + off; 610 611 set_buffer_mapped(bh); 612 bh->b_bdev = sb->s_bdev; 613 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 614 615 valid = ni->i_valid; 616 617 if (ctx == GET_BLOCK_DIRECT_IO_W) { 618 /* ntfs_direct_IO will update ni->i_valid. */ 619 if (vbo >= valid) 620 set_buffer_new(bh); 621 } else if (create) { 622 /* Normal write. */ 623 if (bytes > bh->b_size) 624 bytes = bh->b_size; 625 626 if (vbo >= valid) 627 set_buffer_new(bh); 628 629 if (vbo + bytes > valid) { 630 ni->i_valid = vbo + bytes; 631 mark_inode_dirty(inode); 632 } 633 } else if (vbo >= valid) { 634 /* Read out of valid data. */ 635 clear_buffer_mapped(bh); 636 } else if (vbo + bytes <= valid) { 637 /* Normal read. */ 638 } else if (vbo + block_size <= valid) { 639 /* Normal short read. */ 640 bytes = block_size; 641 } else { 642 /* 643 * Read across valid size: vbo < valid && valid < vbo + block_size 644 */ 645 bytes = block_size; 646 647 if (folio) { 648 u32 voff = valid - vbo; 649 650 bh->b_size = block_size; 651 off = vbo & (PAGE_SIZE - 1); 652 folio_set_bh(bh, folio, off); 653 654 err = bh_read(bh, 0); 655 if (err < 0) 656 goto out; 657 folio_zero_segment(folio, off + voff, off + block_size); 658 } 659 } 660 661 if (bh->b_size > bytes) 662 bh->b_size = bytes; 663 664 #ifndef __LP64__ 665 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 666 static_assert(sizeof(size_t) < sizeof(loff_t)); 667 if (bytes > 0x40000000u) 668 bh->b_size = 0x40000000u; 669 } 670 #endif 671 672 return 0; 673 674 out: 675 return err; 676 } 677 678 int ntfs_get_block(struct inode *inode, sector_t vbn, 679 struct buffer_head *bh_result, int create) 680 { 681 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 682 bh_result, create, GET_BLOCK_GENERAL); 683 } 684 685 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 686 struct buffer_head *bh_result, int create) 687 { 688 return ntfs_get_block_vbo(inode, 689 (u64)vsn << inode->i_sb->s_blocksize_bits, 690 bh_result, create, GET_BLOCK_BMAP); 691 } 692 693 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 694 { 695 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 696 } 697 698 static int ntfs_read_folio(struct file *file, struct folio *folio) 699 { 700 struct page *page = &folio->page; 701 int err; 702 struct address_space *mapping = page->mapping; 703 struct inode *inode = mapping->host; 704 struct ntfs_inode *ni = ntfs_i(inode); 705 706 if (is_resident(ni)) { 707 ni_lock(ni); 708 err = attr_data_read_resident(ni, page); 709 ni_unlock(ni); 710 if (err != E_NTFS_NONRESIDENT) { 711 unlock_page(page); 712 return err; 713 } 714 } 715 716 if (is_compressed(ni)) { 717 ni_lock(ni); 718 err = ni_readpage_cmpr(ni, page); 719 ni_unlock(ni); 720 return err; 721 } 722 723 /* Normal + sparse files. */ 724 return mpage_read_folio(folio, ntfs_get_block); 725 } 726 727 static void ntfs_readahead(struct readahead_control *rac) 728 { 729 struct address_space *mapping = rac->mapping; 730 struct inode *inode = mapping->host; 731 struct ntfs_inode *ni = ntfs_i(inode); 732 u64 valid; 733 loff_t pos; 734 735 if (is_resident(ni)) { 736 /* No readahead for resident. */ 737 return; 738 } 739 740 if (is_compressed(ni)) { 741 /* No readahead for compressed. */ 742 return; 743 } 744 745 valid = ni->i_valid; 746 pos = readahead_pos(rac); 747 748 if (valid < i_size_read(inode) && pos <= valid && 749 valid < pos + readahead_length(rac)) { 750 /* Range cross 'valid'. Read it page by page. */ 751 return; 752 } 753 754 mpage_readahead(rac, ntfs_get_block); 755 } 756 757 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 758 struct buffer_head *bh_result, int create) 759 { 760 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 761 bh_result, create, GET_BLOCK_DIRECT_IO_R); 762 } 763 764 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 765 struct buffer_head *bh_result, int create) 766 { 767 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 768 bh_result, create, GET_BLOCK_DIRECT_IO_W); 769 } 770 771 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 772 { 773 struct file *file = iocb->ki_filp; 774 struct address_space *mapping = file->f_mapping; 775 struct inode *inode = mapping->host; 776 struct ntfs_inode *ni = ntfs_i(inode); 777 loff_t vbo = iocb->ki_pos; 778 loff_t end; 779 int wr = iov_iter_rw(iter) & WRITE; 780 size_t iter_count = iov_iter_count(iter); 781 loff_t valid; 782 ssize_t ret; 783 784 if (is_resident(ni)) { 785 /* Switch to buffered write. */ 786 ret = 0; 787 goto out; 788 } 789 790 ret = blockdev_direct_IO(iocb, inode, iter, 791 wr ? ntfs_get_block_direct_IO_W : 792 ntfs_get_block_direct_IO_R); 793 794 if (ret > 0) 795 end = vbo + ret; 796 else if (wr && ret == -EIOCBQUEUED) 797 end = vbo + iter_count; 798 else 799 goto out; 800 801 valid = ni->i_valid; 802 if (wr) { 803 if (end > valid && !S_ISBLK(inode->i_mode)) { 804 ni->i_valid = end; 805 mark_inode_dirty(inode); 806 } 807 } else if (vbo < valid && valid < end) { 808 /* Fix page. */ 809 iov_iter_revert(iter, end - valid); 810 iov_iter_zero(end - valid, iter); 811 } 812 813 out: 814 return ret; 815 } 816 817 int ntfs_set_size(struct inode *inode, u64 new_size) 818 { 819 struct super_block *sb = inode->i_sb; 820 struct ntfs_sb_info *sbi = sb->s_fs_info; 821 struct ntfs_inode *ni = ntfs_i(inode); 822 int err; 823 824 /* Check for maximum file size. */ 825 if (is_sparsed(ni) || is_compressed(ni)) { 826 if (new_size > sbi->maxbytes_sparse) { 827 err = -EFBIG; 828 goto out; 829 } 830 } else if (new_size > sbi->maxbytes) { 831 err = -EFBIG; 832 goto out; 833 } 834 835 ni_lock(ni); 836 down_write(&ni->file.run_lock); 837 838 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 839 &ni->i_valid, true, NULL); 840 841 up_write(&ni->file.run_lock); 842 ni_unlock(ni); 843 844 mark_inode_dirty(inode); 845 846 out: 847 return err; 848 } 849 850 static int ntfs_resident_writepage(struct folio *folio, 851 struct writeback_control *wbc, void *data) 852 { 853 struct address_space *mapping = data; 854 struct inode *inode = mapping->host; 855 struct ntfs_inode *ni = ntfs_i(inode); 856 int ret; 857 858 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 859 return -EIO; 860 861 ni_lock(ni); 862 ret = attr_data_write_resident(ni, &folio->page); 863 ni_unlock(ni); 864 865 if (ret != E_NTFS_NONRESIDENT) 866 folio_unlock(folio); 867 mapping_set_error(mapping, ret); 868 return ret; 869 } 870 871 static int ntfs_writepages(struct address_space *mapping, 872 struct writeback_control *wbc) 873 { 874 struct inode *inode = mapping->host; 875 876 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 877 return -EIO; 878 879 if (is_resident(ntfs_i(inode))) 880 return write_cache_pages(mapping, wbc, ntfs_resident_writepage, 881 mapping); 882 return mpage_writepages(mapping, wbc, ntfs_get_block); 883 } 884 885 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 886 struct buffer_head *bh_result, int create) 887 { 888 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 889 bh_result, create, GET_BLOCK_WRITE_BEGIN); 890 } 891 892 int ntfs_write_begin(struct file *file, struct address_space *mapping, 893 loff_t pos, u32 len, struct page **pagep, void **fsdata) 894 { 895 int err; 896 struct inode *inode = mapping->host; 897 struct ntfs_inode *ni = ntfs_i(inode); 898 899 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 900 return -EIO; 901 902 *pagep = NULL; 903 if (is_resident(ni)) { 904 struct page *page = 905 grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT); 906 907 if (!page) { 908 err = -ENOMEM; 909 goto out; 910 } 911 912 ni_lock(ni); 913 err = attr_data_read_resident(ni, page); 914 ni_unlock(ni); 915 916 if (!err) { 917 *pagep = page; 918 goto out; 919 } 920 unlock_page(page); 921 put_page(page); 922 923 if (err != E_NTFS_NONRESIDENT) 924 goto out; 925 } 926 927 err = block_write_begin(mapping, pos, len, pagep, 928 ntfs_get_block_write_begin); 929 930 out: 931 return err; 932 } 933 934 /* 935 * ntfs_write_end - Address_space_operations::write_end. 936 */ 937 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, 938 u32 len, u32 copied, struct page *page, void *fsdata) 939 { 940 struct inode *inode = mapping->host; 941 struct ntfs_inode *ni = ntfs_i(inode); 942 u64 valid = ni->i_valid; 943 bool dirty = false; 944 int err; 945 946 if (is_resident(ni)) { 947 ni_lock(ni); 948 err = attr_data_write_resident(ni, page); 949 ni_unlock(ni); 950 if (!err) { 951 dirty = true; 952 /* Clear any buffers in page. */ 953 if (page_has_buffers(page)) { 954 struct buffer_head *head, *bh; 955 956 bh = head = page_buffers(page); 957 do { 958 clear_buffer_dirty(bh); 959 clear_buffer_mapped(bh); 960 set_buffer_uptodate(bh); 961 } while (head != (bh = bh->b_this_page)); 962 } 963 SetPageUptodate(page); 964 err = copied; 965 } 966 unlock_page(page); 967 put_page(page); 968 } else { 969 err = generic_write_end(file, mapping, pos, len, copied, page, 970 fsdata); 971 } 972 973 if (err >= 0) { 974 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 975 inode->i_mtime = inode_set_ctime_current(inode); 976 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 977 dirty = true; 978 } 979 980 if (valid != ni->i_valid) { 981 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 982 dirty = true; 983 } 984 985 if (pos + err > inode->i_size) { 986 i_size_write(inode, pos + err); 987 dirty = true; 988 } 989 990 if (dirty) 991 mark_inode_dirty(inode); 992 } 993 994 return err; 995 } 996 997 int reset_log_file(struct inode *inode) 998 { 999 int err; 1000 loff_t pos = 0; 1001 u32 log_size = inode->i_size; 1002 struct address_space *mapping = inode->i_mapping; 1003 1004 for (;;) { 1005 u32 len; 1006 void *kaddr; 1007 struct page *page; 1008 1009 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 1010 1011 err = block_write_begin(mapping, pos, len, &page, 1012 ntfs_get_block_write_begin); 1013 if (err) 1014 goto out; 1015 1016 kaddr = kmap_atomic(page); 1017 memset(kaddr, -1, len); 1018 kunmap_atomic(kaddr); 1019 flush_dcache_page(page); 1020 1021 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 1022 if (err < 0) 1023 goto out; 1024 pos += len; 1025 1026 if (pos >= log_size) 1027 break; 1028 balance_dirty_pages_ratelimited(mapping); 1029 } 1030 out: 1031 mark_inode_dirty_sync(inode); 1032 1033 return err; 1034 } 1035 1036 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1037 { 1038 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1039 } 1040 1041 int ntfs_sync_inode(struct inode *inode) 1042 { 1043 return _ni_write_inode(inode, 1); 1044 } 1045 1046 /* 1047 * writeback_inode - Helper function for ntfs_flush_inodes(). 1048 * 1049 * This writes both the inode and the file data blocks, waiting 1050 * for in flight data blocks before the start of the call. It 1051 * does not wait for any io started during the call. 1052 */ 1053 static int writeback_inode(struct inode *inode) 1054 { 1055 int ret = sync_inode_metadata(inode, 0); 1056 1057 if (!ret) 1058 ret = filemap_fdatawrite(inode->i_mapping); 1059 return ret; 1060 } 1061 1062 /* 1063 * ntfs_flush_inodes 1064 * 1065 * Write data and metadata corresponding to i1 and i2. The io is 1066 * started but we do not wait for any of it to finish. 1067 * 1068 * filemap_flush() is used for the block device, so if there is a dirty 1069 * page for a block already in flight, we will not wait and start the 1070 * io over again. 1071 */ 1072 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1073 struct inode *i2) 1074 { 1075 int ret = 0; 1076 1077 if (i1) 1078 ret = writeback_inode(i1); 1079 if (!ret && i2) 1080 ret = writeback_inode(i2); 1081 if (!ret) 1082 ret = sync_blockdev_nowait(sb->s_bdev); 1083 return ret; 1084 } 1085 1086 int inode_write_data(struct inode *inode, const void *data, size_t bytes) 1087 { 1088 pgoff_t idx; 1089 1090 /* Write non resident data. */ 1091 for (idx = 0; bytes; idx++) { 1092 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1093 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1094 1095 if (IS_ERR(page)) 1096 return PTR_ERR(page); 1097 1098 lock_page(page); 1099 WARN_ON(!PageUptodate(page)); 1100 ClearPageUptodate(page); 1101 1102 memcpy(page_address(page), data, op); 1103 1104 flush_dcache_page(page); 1105 SetPageUptodate(page); 1106 unlock_page(page); 1107 1108 ntfs_unmap_page(page); 1109 1110 bytes -= op; 1111 data = Add2Ptr(data, PAGE_SIZE); 1112 } 1113 return 0; 1114 } 1115 1116 /* 1117 * ntfs_reparse_bytes 1118 * 1119 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1120 * for unicode string of @uni_len length. 1121 */ 1122 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1123 { 1124 /* Header + unicode string + decorated unicode string. */ 1125 return sizeof(short) * (2 * uni_len + 4) + 1126 offsetof(struct REPARSE_DATA_BUFFER, 1127 SymbolicLinkReparseBuffer.PathBuffer); 1128 } 1129 1130 static struct REPARSE_DATA_BUFFER * 1131 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1132 u32 size, u16 *nsize) 1133 { 1134 int i, err; 1135 struct REPARSE_DATA_BUFFER *rp; 1136 __le16 *rp_name; 1137 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1138 1139 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1140 if (!rp) 1141 return ERR_PTR(-ENOMEM); 1142 1143 rs = &rp->SymbolicLinkReparseBuffer; 1144 rp_name = rs->PathBuffer; 1145 1146 /* Convert link name to UTF-16. */ 1147 err = ntfs_nls_to_utf16(sbi, symname, size, 1148 (struct cpu_str *)(rp_name - 1), 2 * size, 1149 UTF16_LITTLE_ENDIAN); 1150 if (err < 0) 1151 goto out; 1152 1153 /* err = the length of unicode name of symlink. */ 1154 *nsize = ntfs_reparse_bytes(err); 1155 1156 if (*nsize > sbi->reparse.max_size) { 1157 err = -EFBIG; 1158 goto out; 1159 } 1160 1161 /* Translate Linux '/' into Windows '\'. */ 1162 for (i = 0; i < err; i++) { 1163 if (rp_name[i] == cpu_to_le16('/')) 1164 rp_name[i] = cpu_to_le16('\\'); 1165 } 1166 1167 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1168 rp->ReparseDataLength = 1169 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1170 SymbolicLinkReparseBuffer)); 1171 1172 /* PrintName + SubstituteName. */ 1173 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1174 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1175 rs->PrintNameLength = rs->SubstituteNameOffset; 1176 1177 /* 1178 * TODO: Use relative path if possible to allow Windows to 1179 * parse this path. 1180 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1181 */ 1182 rs->Flags = 0; 1183 1184 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1185 1186 /* Decorate SubstituteName. */ 1187 rp_name += err; 1188 rp_name[0] = cpu_to_le16('\\'); 1189 rp_name[1] = cpu_to_le16('?'); 1190 rp_name[2] = cpu_to_le16('?'); 1191 rp_name[3] = cpu_to_le16('\\'); 1192 1193 return rp; 1194 out: 1195 kfree(rp); 1196 return ERR_PTR(err); 1197 } 1198 1199 /* 1200 * ntfs_create_inode 1201 * 1202 * Helper function for: 1203 * - ntfs_create 1204 * - ntfs_mknod 1205 * - ntfs_symlink 1206 * - ntfs_mkdir 1207 * - ntfs_atomic_open 1208 * 1209 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked 1210 */ 1211 struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, 1212 struct dentry *dentry, 1213 const struct cpu_str *uni, umode_t mode, 1214 dev_t dev, const char *symname, u32 size, 1215 struct ntfs_fnd *fnd) 1216 { 1217 int err; 1218 struct super_block *sb = dir->i_sb; 1219 struct ntfs_sb_info *sbi = sb->s_fs_info; 1220 const struct qstr *name = &dentry->d_name; 1221 CLST ino = 0; 1222 struct ntfs_inode *dir_ni = ntfs_i(dir); 1223 struct ntfs_inode *ni = NULL; 1224 struct inode *inode = NULL; 1225 struct ATTRIB *attr; 1226 struct ATTR_STD_INFO5 *std5; 1227 struct ATTR_FILE_NAME *fname; 1228 struct MFT_REC *rec; 1229 u32 asize, dsize, sd_size; 1230 enum FILE_ATTRIBUTE fa; 1231 __le32 security_id = SECURITY_ID_INVALID; 1232 CLST vcn; 1233 const void *sd; 1234 u16 t16, nsize = 0, aid = 0; 1235 struct INDEX_ROOT *root, *dir_root; 1236 struct NTFS_DE *e, *new_de = NULL; 1237 struct REPARSE_DATA_BUFFER *rp = NULL; 1238 bool rp_inserted = false; 1239 1240 if (!fnd) 1241 ni_lock_dir(dir_ni); 1242 1243 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1244 if (!dir_root) { 1245 err = -EINVAL; 1246 goto out1; 1247 } 1248 1249 if (S_ISDIR(mode)) { 1250 /* Use parent's directory attributes. */ 1251 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1252 FILE_ATTRIBUTE_ARCHIVE; 1253 /* 1254 * By default child directory inherits parent attributes. 1255 * Root directory is hidden + system. 1256 * Make an exception for children in root. 1257 */ 1258 if (dir->i_ino == MFT_REC_ROOT) 1259 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1260 } else if (S_ISLNK(mode)) { 1261 /* It is good idea that link should be the same type (file/dir) as target */ 1262 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1263 1264 /* 1265 * Linux: there are dir/file/symlink and so on. 1266 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1267 * It is good idea to create: 1268 * dir + reparse if 'symname' points to directory 1269 * or 1270 * file + reparse if 'symname' points to file 1271 * Unfortunately kern_path hangs if symname contains 'dir'. 1272 */ 1273 1274 /* 1275 * struct path path; 1276 * 1277 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1278 * struct inode *target = d_inode(path.dentry); 1279 * 1280 * if (S_ISDIR(target->i_mode)) 1281 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1282 * // if ( target->i_sb == sb ){ 1283 * // use relative path? 1284 * // } 1285 * path_put(&path); 1286 * } 1287 */ 1288 } else if (S_ISREG(mode)) { 1289 if (sbi->options->sparse) { 1290 /* Sparsed regular file, cause option 'sparse'. */ 1291 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1292 FILE_ATTRIBUTE_ARCHIVE; 1293 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1294 /* Compressed regular file, if parent is compressed. */ 1295 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1296 } else { 1297 /* Regular file, default attributes. */ 1298 fa = FILE_ATTRIBUTE_ARCHIVE; 1299 } 1300 } else { 1301 fa = FILE_ATTRIBUTE_ARCHIVE; 1302 } 1303 1304 /* If option "hide_dot_files" then set hidden attribute for dot files. */ 1305 if (sbi->options->hide_dot_files && name->name[0] == '.') 1306 fa |= FILE_ATTRIBUTE_HIDDEN; 1307 1308 if (!(mode & 0222)) 1309 fa |= FILE_ATTRIBUTE_READONLY; 1310 1311 /* Allocate PATH_MAX bytes. */ 1312 new_de = __getname(); 1313 if (!new_de) { 1314 err = -ENOMEM; 1315 goto out1; 1316 } 1317 1318 if (unlikely(ntfs3_forced_shutdown(sb))) { 1319 err = -EIO; 1320 goto out2; 1321 } 1322 1323 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1324 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1325 1326 /* Step 1: allocate and fill new mft record. */ 1327 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1328 if (err) 1329 goto out2; 1330 1331 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); 1332 if (IS_ERR(ni)) { 1333 err = PTR_ERR(ni); 1334 ni = NULL; 1335 goto out3; 1336 } 1337 inode = &ni->vfs_inode; 1338 inode_init_owner(idmap, inode, dir, mode); 1339 mode = inode->i_mode; 1340 1341 ni->i_crtime = current_time(inode); 1342 1343 rec = ni->mi.mrec; 1344 rec->hard_links = cpu_to_le16(1); 1345 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1346 1347 /* Get default security id. */ 1348 sd = s_default_security; 1349 sd_size = sizeof(s_default_security); 1350 1351 if (is_ntfs3(sbi)) { 1352 security_id = dir_ni->std_security_id; 1353 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1354 security_id = sbi->security.def_security_id; 1355 1356 if (security_id == SECURITY_ID_INVALID && 1357 !ntfs_insert_security(sbi, sd, sd_size, 1358 &security_id, NULL)) 1359 sbi->security.def_security_id = security_id; 1360 } 1361 } 1362 1363 /* Insert standard info. */ 1364 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1365 1366 if (security_id == SECURITY_ID_INVALID) { 1367 dsize = sizeof(struct ATTR_STD_INFO); 1368 } else { 1369 dsize = sizeof(struct ATTR_STD_INFO5); 1370 std5->security_id = security_id; 1371 ni->std_security_id = security_id; 1372 } 1373 asize = SIZEOF_RESIDENT + dsize; 1374 1375 attr->type = ATTR_STD; 1376 attr->size = cpu_to_le32(asize); 1377 attr->id = cpu_to_le16(aid++); 1378 attr->res.data_off = SIZEOF_RESIDENT_LE; 1379 attr->res.data_size = cpu_to_le32(dsize); 1380 1381 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1382 kernel2nt(&ni->i_crtime); 1383 1384 std5->fa = ni->std_fa = fa; 1385 1386 attr = Add2Ptr(attr, asize); 1387 1388 /* Insert file name. */ 1389 err = fill_name_de(sbi, new_de, name, uni); 1390 if (err) 1391 goto out4; 1392 1393 mi_get_ref(&ni->mi, &new_de->ref); 1394 1395 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1396 1397 if (sbi->options->windows_names && 1398 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) { 1399 err = -EINVAL; 1400 goto out4; 1401 } 1402 1403 mi_get_ref(&dir_ni->mi, &fname->home); 1404 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1405 fname->dup.a_time = std5->cr_time; 1406 fname->dup.alloc_size = fname->dup.data_size = 0; 1407 fname->dup.fa = std5->fa; 1408 fname->dup.ea_size = fname->dup.reparse = 0; 1409 1410 dsize = le16_to_cpu(new_de->key_size); 1411 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1412 1413 attr->type = ATTR_NAME; 1414 attr->size = cpu_to_le32(asize); 1415 attr->res.data_off = SIZEOF_RESIDENT_LE; 1416 attr->res.flags = RESIDENT_FLAG_INDEXED; 1417 attr->id = cpu_to_le16(aid++); 1418 attr->res.data_size = cpu_to_le32(dsize); 1419 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1420 1421 attr = Add2Ptr(attr, asize); 1422 1423 if (security_id == SECURITY_ID_INVALID) { 1424 /* Insert security attribute. */ 1425 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1426 1427 attr->type = ATTR_SECURE; 1428 attr->size = cpu_to_le32(asize); 1429 attr->id = cpu_to_le16(aid++); 1430 attr->res.data_off = SIZEOF_RESIDENT_LE; 1431 attr->res.data_size = cpu_to_le32(sd_size); 1432 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1433 1434 attr = Add2Ptr(attr, asize); 1435 } 1436 1437 attr->id = cpu_to_le16(aid++); 1438 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1439 /* 1440 * Regular directory or symlink to directory. 1441 * Create root attribute. 1442 */ 1443 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1444 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1445 1446 attr->type = ATTR_ROOT; 1447 attr->size = cpu_to_le32(asize); 1448 1449 attr->name_len = ARRAY_SIZE(I30_NAME); 1450 attr->name_off = SIZEOF_RESIDENT_LE; 1451 attr->res.data_off = 1452 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1453 attr->res.data_size = cpu_to_le32(dsize); 1454 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1455 sizeof(I30_NAME)); 1456 1457 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1458 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1459 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); 1460 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1461 sizeof(struct NTFS_DE)); 1462 root->ihdr.total = root->ihdr.used; 1463 1464 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1465 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1466 e->flags = NTFS_IE_LAST; 1467 } else if (S_ISLNK(mode)) { 1468 /* 1469 * Symlink to file. 1470 * Create empty resident data attribute. 1471 */ 1472 asize = SIZEOF_RESIDENT; 1473 1474 /* Insert empty ATTR_DATA */ 1475 attr->type = ATTR_DATA; 1476 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1477 attr->name_off = SIZEOF_RESIDENT_LE; 1478 attr->res.data_off = SIZEOF_RESIDENT_LE; 1479 } else if (S_ISREG(mode)) { 1480 /* 1481 * Regular file. Create empty non resident data attribute. 1482 */ 1483 attr->type = ATTR_DATA; 1484 attr->non_res = 1; 1485 attr->nres.evcn = cpu_to_le64(-1ll); 1486 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1487 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1488 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1489 attr->flags = ATTR_FLAG_SPARSED; 1490 asize = SIZEOF_NONRESIDENT_EX + 8; 1491 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1492 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1493 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1494 attr->flags = ATTR_FLAG_COMPRESSED; 1495 attr->nres.c_unit = COMPRESSION_UNIT; 1496 asize = SIZEOF_NONRESIDENT_EX + 8; 1497 } else { 1498 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1499 attr->name_off = SIZEOF_NONRESIDENT_LE; 1500 asize = SIZEOF_NONRESIDENT + 8; 1501 } 1502 attr->nres.run_off = attr->name_off; 1503 } else { 1504 /* 1505 * Node. Create empty resident data attribute. 1506 */ 1507 attr->type = ATTR_DATA; 1508 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1509 attr->name_off = SIZEOF_RESIDENT_LE; 1510 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1511 attr->flags = ATTR_FLAG_SPARSED; 1512 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1513 attr->flags = ATTR_FLAG_COMPRESSED; 1514 attr->res.data_off = SIZEOF_RESIDENT_LE; 1515 asize = SIZEOF_RESIDENT; 1516 ni->ni_flags |= NI_FLAG_RESIDENT; 1517 } 1518 1519 if (S_ISDIR(mode)) { 1520 ni->ni_flags |= NI_FLAG_DIR; 1521 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1522 if (err) 1523 goto out4; 1524 } else if (S_ISLNK(mode)) { 1525 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1526 1527 if (IS_ERR(rp)) { 1528 err = PTR_ERR(rp); 1529 rp = NULL; 1530 goto out4; 1531 } 1532 1533 /* 1534 * Insert ATTR_REPARSE. 1535 */ 1536 attr = Add2Ptr(attr, asize); 1537 attr->type = ATTR_REPARSE; 1538 attr->id = cpu_to_le16(aid++); 1539 1540 /* Resident or non resident? */ 1541 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1542 t16 = PtrOffset(rec, attr); 1543 1544 /* 1545 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1546 * It is good idea to keep extened attributes resident. 1547 */ 1548 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1549 CLST alen; 1550 CLST clst = bytes_to_cluster(sbi, nsize); 1551 1552 /* Bytes per runs. */ 1553 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1554 1555 attr->non_res = 1; 1556 attr->nres.evcn = cpu_to_le64(clst - 1); 1557 attr->name_off = SIZEOF_NONRESIDENT_LE; 1558 attr->nres.run_off = attr->name_off; 1559 attr->nres.data_size = cpu_to_le64(nsize); 1560 attr->nres.valid_size = attr->nres.data_size; 1561 attr->nres.alloc_size = 1562 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1563 1564 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1565 clst, NULL, ALLOCATE_DEF, 1566 &alen, 0, NULL, NULL); 1567 if (err) 1568 goto out5; 1569 1570 err = run_pack(&ni->file.run, 0, clst, 1571 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1572 &vcn); 1573 if (err < 0) 1574 goto out5; 1575 1576 if (vcn != clst) { 1577 err = -EINVAL; 1578 goto out5; 1579 } 1580 1581 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1582 /* Write non resident data. */ 1583 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, 1584 nsize, 0); 1585 if (err) 1586 goto out5; 1587 } else { 1588 attr->res.data_off = SIZEOF_RESIDENT_LE; 1589 attr->res.data_size = cpu_to_le32(nsize); 1590 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1591 } 1592 /* Size of symlink equals the length of input string. */ 1593 inode->i_size = size; 1594 1595 attr->size = cpu_to_le32(asize); 1596 1597 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1598 &new_de->ref); 1599 if (err) 1600 goto out5; 1601 1602 rp_inserted = true; 1603 } 1604 1605 attr = Add2Ptr(attr, asize); 1606 attr->type = ATTR_END; 1607 1608 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1609 rec->next_attr_id = cpu_to_le16(aid); 1610 1611 inode->i_generation = le16_to_cpu(rec->seq); 1612 1613 if (S_ISDIR(mode)) { 1614 inode->i_op = &ntfs_dir_inode_operations; 1615 inode->i_fop = &ntfs_dir_operations; 1616 } else if (S_ISLNK(mode)) { 1617 inode->i_op = &ntfs_link_inode_operations; 1618 inode->i_fop = NULL; 1619 inode->i_mapping->a_ops = &ntfs_aops; 1620 inode->i_size = size; 1621 inode_nohighmem(inode); 1622 } else if (S_ISREG(mode)) { 1623 inode->i_op = &ntfs_file_inode_operations; 1624 inode->i_fop = &ntfs_file_operations; 1625 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 1626 &ntfs_aops; 1627 init_rwsem(&ni->file.run_lock); 1628 } else { 1629 inode->i_op = &ntfs_special_inode_operations; 1630 init_special_inode(inode, mode, dev); 1631 } 1632 1633 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1634 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1635 err = ntfs_init_acl(idmap, inode, dir); 1636 if (err) 1637 goto out5; 1638 } else 1639 #endif 1640 { 1641 inode->i_flags |= S_NOSEC; 1642 } 1643 1644 /* 1645 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. 1646 * The packed size of extended attribute is stored in direntry too. 1647 * 'fname' here points to inside new_de. 1648 */ 1649 ntfs_save_wsl_perm(inode, &fname->dup.ea_size); 1650 1651 /* 1652 * update ea_size in file_name attribute too. 1653 * Use ni_find_attr cause layout of MFT record may be changed 1654 * in ntfs_init_acl and ntfs_save_wsl_perm. 1655 */ 1656 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL); 1657 if (attr) { 1658 struct ATTR_FILE_NAME *fn; 1659 1660 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1661 if (fn) 1662 fn->dup.ea_size = fname->dup.ea_size; 1663 } 1664 1665 /* We do not need to update parent directory later */ 1666 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; 1667 1668 /* Step 2: Add new name in index. */ 1669 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1670 if (err) 1671 goto out6; 1672 1673 /* 1674 * Call 'd_instantiate' after inode->i_op is set 1675 * but before finish_open. 1676 */ 1677 d_instantiate(dentry, inode); 1678 1679 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ 1680 inode->i_atime = inode->i_mtime = 1681 inode_set_ctime_to_ts(inode, ni->i_crtime); 1682 dir->i_mtime = inode_set_ctime_to_ts(dir, ni->i_crtime); 1683 1684 mark_inode_dirty(dir); 1685 mark_inode_dirty(inode); 1686 1687 /* Normal exit. */ 1688 goto out2; 1689 1690 out6: 1691 if (rp_inserted) 1692 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1693 1694 out5: 1695 if (!S_ISDIR(mode)) 1696 run_deallocate(sbi, &ni->file.run, false); 1697 1698 out4: 1699 clear_rec_inuse(rec); 1700 clear_nlink(inode); 1701 ni->mi.dirty = false; 1702 discard_new_inode(inode); 1703 out3: 1704 ntfs_mark_rec_free(sbi, ino, false); 1705 1706 out2: 1707 __putname(new_de); 1708 kfree(rp); 1709 1710 out1: 1711 if (!fnd) 1712 ni_unlock(dir_ni); 1713 1714 if (err) 1715 return ERR_PTR(err); 1716 1717 unlock_new_inode(inode); 1718 1719 return inode; 1720 } 1721 1722 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1723 { 1724 int err; 1725 struct ntfs_inode *ni = ntfs_i(inode); 1726 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1727 struct NTFS_DE *de; 1728 1729 /* Allocate PATH_MAX bytes. */ 1730 de = __getname(); 1731 if (!de) 1732 return -ENOMEM; 1733 1734 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1735 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1736 1737 /* Construct 'de'. */ 1738 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1739 if (err) 1740 goto out; 1741 1742 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1743 out: 1744 __putname(de); 1745 return err; 1746 } 1747 1748 /* 1749 * ntfs_unlink_inode 1750 * 1751 * inode_operations::unlink 1752 * inode_operations::rmdir 1753 */ 1754 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1755 { 1756 int err; 1757 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1758 struct inode *inode = d_inode(dentry); 1759 struct ntfs_inode *ni = ntfs_i(inode); 1760 struct ntfs_inode *dir_ni = ntfs_i(dir); 1761 struct NTFS_DE *de, *de2 = NULL; 1762 int undo_remove; 1763 1764 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1765 return -EINVAL; 1766 1767 /* Allocate PATH_MAX bytes. */ 1768 de = __getname(); 1769 if (!de) 1770 return -ENOMEM; 1771 1772 ni_lock(ni); 1773 1774 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1775 err = -ENOTEMPTY; 1776 goto out; 1777 } 1778 1779 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1780 if (err < 0) 1781 goto out; 1782 1783 undo_remove = 0; 1784 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1785 1786 if (!err) { 1787 drop_nlink(inode); 1788 dir->i_mtime = inode_set_ctime_current(dir); 1789 mark_inode_dirty(dir); 1790 inode_set_ctime_to_ts(inode, inode_get_ctime(dir)); 1791 if (inode->i_nlink) 1792 mark_inode_dirty(inode); 1793 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1794 _ntfs_bad_inode(inode); 1795 } else { 1796 if (ni_is_dirty(dir)) 1797 mark_inode_dirty(dir); 1798 if (ni_is_dirty(inode)) 1799 mark_inode_dirty(inode); 1800 } 1801 1802 out: 1803 ni_unlock(ni); 1804 __putname(de); 1805 return err; 1806 } 1807 1808 void ntfs_evict_inode(struct inode *inode) 1809 { 1810 truncate_inode_pages_final(&inode->i_data); 1811 1812 invalidate_inode_buffers(inode); 1813 clear_inode(inode); 1814 1815 ni_clear(ntfs_i(inode)); 1816 } 1817 1818 /* 1819 * ntfs_translate_junction 1820 * 1821 * Translate a Windows junction target to the Linux equivalent. 1822 * On junctions, targets are always absolute (they include the drive 1823 * letter). We have no way of knowing if the target is for the current 1824 * mounted device or not so we just assume it is. 1825 */ 1826 static int ntfs_translate_junction(const struct super_block *sb, 1827 const struct dentry *link_de, char *target, 1828 int target_len, int target_max) 1829 { 1830 int tl_len, err = target_len; 1831 char *link_path_buffer = NULL, *link_path; 1832 char *translated = NULL; 1833 char *target_start; 1834 int copy_len; 1835 1836 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); 1837 if (!link_path_buffer) { 1838 err = -ENOMEM; 1839 goto out; 1840 } 1841 /* Get link path, relative to mount point */ 1842 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); 1843 if (IS_ERR(link_path)) { 1844 ntfs_err(sb, "Error getting link path"); 1845 err = -EINVAL; 1846 goto out; 1847 } 1848 1849 translated = kmalloc(PATH_MAX, GFP_NOFS); 1850 if (!translated) { 1851 err = -ENOMEM; 1852 goto out; 1853 } 1854 1855 /* Make translated path a relative path to mount point */ 1856 strcpy(translated, "./"); 1857 ++link_path; /* Skip leading / */ 1858 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) { 1859 if (*link_path == '/') { 1860 if (PATH_MAX - tl_len < sizeof("../")) { 1861 ntfs_err(sb, 1862 "Link path %s has too many components", 1863 link_path); 1864 err = -EINVAL; 1865 goto out; 1866 } 1867 strcpy(translated + tl_len, "../"); 1868 tl_len += sizeof("../") - 1; 1869 } 1870 } 1871 1872 /* Skip drive letter */ 1873 target_start = target; 1874 while (*target_start && *target_start != ':') 1875 ++target_start; 1876 1877 if (!*target_start) { 1878 ntfs_err(sb, "Link target (%s) missing drive separator", 1879 target); 1880 err = -EINVAL; 1881 goto out; 1882 } 1883 1884 /* Skip drive separator and leading /, if exists */ 1885 target_start += 1 + (target_start[1] == '/'); 1886 copy_len = target_len - (target_start - target); 1887 1888 if (PATH_MAX - tl_len <= copy_len) { 1889 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)", 1890 target_start, PATH_MAX - tl_len, copy_len); 1891 err = -EINVAL; 1892 goto out; 1893 } 1894 1895 /* translated path has a trailing / and target_start does not */ 1896 strcpy(translated + tl_len, target_start); 1897 tl_len += copy_len; 1898 if (target_max <= tl_len) { 1899 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)", 1900 translated, target_max, tl_len); 1901 err = -EINVAL; 1902 goto out; 1903 } 1904 strcpy(target, translated); 1905 err = tl_len; 1906 1907 out: 1908 kfree(link_path_buffer); 1909 kfree(translated); 1910 return err; 1911 } 1912 1913 static noinline int ntfs_readlink_hlp(const struct dentry *link_de, 1914 struct inode *inode, char *buffer, 1915 int buflen) 1916 { 1917 int i, err = -EINVAL; 1918 struct ntfs_inode *ni = ntfs_i(inode); 1919 struct super_block *sb = inode->i_sb; 1920 struct ntfs_sb_info *sbi = sb->s_fs_info; 1921 u64 size; 1922 u16 ulen = 0; 1923 void *to_free = NULL; 1924 struct REPARSE_DATA_BUFFER *rp; 1925 const __le16 *uname; 1926 struct ATTRIB *attr; 1927 1928 /* Reparse data present. Try to parse it. */ 1929 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1930 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1931 1932 *buffer = 0; 1933 1934 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1935 if (!attr) 1936 goto out; 1937 1938 if (!attr->non_res) { 1939 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1940 if (!rp) 1941 goto out; 1942 size = le32_to_cpu(attr->res.data_size); 1943 } else { 1944 size = le64_to_cpu(attr->nres.data_size); 1945 rp = NULL; 1946 } 1947 1948 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1949 goto out; 1950 1951 if (!rp) { 1952 rp = kmalloc(size, GFP_NOFS); 1953 if (!rp) { 1954 err = -ENOMEM; 1955 goto out; 1956 } 1957 to_free = rp; 1958 /* Read into temporal buffer. */ 1959 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1960 if (err) 1961 goto out; 1962 } 1963 1964 /* Microsoft Tag. */ 1965 switch (rp->ReparseTag) { 1966 case IO_REPARSE_TAG_MOUNT_POINT: 1967 /* Mount points and junctions. */ 1968 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1969 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1970 MountPointReparseBuffer.PathBuffer)) 1971 goto out; 1972 uname = Add2Ptr(rp, 1973 offsetof(struct REPARSE_DATA_BUFFER, 1974 MountPointReparseBuffer.PathBuffer) + 1975 le16_to_cpu(rp->MountPointReparseBuffer 1976 .PrintNameOffset)); 1977 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1978 break; 1979 1980 case IO_REPARSE_TAG_SYMLINK: 1981 /* FolderSymbolicLink */ 1982 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1983 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1984 SymbolicLinkReparseBuffer.PathBuffer)) 1985 goto out; 1986 uname = Add2Ptr( 1987 rp, offsetof(struct REPARSE_DATA_BUFFER, 1988 SymbolicLinkReparseBuffer.PathBuffer) + 1989 le16_to_cpu(rp->SymbolicLinkReparseBuffer 1990 .PrintNameOffset)); 1991 ulen = le16_to_cpu( 1992 rp->SymbolicLinkReparseBuffer.PrintNameLength); 1993 break; 1994 1995 case IO_REPARSE_TAG_CLOUD: 1996 case IO_REPARSE_TAG_CLOUD_1: 1997 case IO_REPARSE_TAG_CLOUD_2: 1998 case IO_REPARSE_TAG_CLOUD_3: 1999 case IO_REPARSE_TAG_CLOUD_4: 2000 case IO_REPARSE_TAG_CLOUD_5: 2001 case IO_REPARSE_TAG_CLOUD_6: 2002 case IO_REPARSE_TAG_CLOUD_7: 2003 case IO_REPARSE_TAG_CLOUD_8: 2004 case IO_REPARSE_TAG_CLOUD_9: 2005 case IO_REPARSE_TAG_CLOUD_A: 2006 case IO_REPARSE_TAG_CLOUD_B: 2007 case IO_REPARSE_TAG_CLOUD_C: 2008 case IO_REPARSE_TAG_CLOUD_D: 2009 case IO_REPARSE_TAG_CLOUD_E: 2010 case IO_REPARSE_TAG_CLOUD_F: 2011 err = sizeof("OneDrive") - 1; 2012 if (err > buflen) 2013 err = buflen; 2014 memcpy(buffer, "OneDrive", err); 2015 goto out; 2016 2017 default: 2018 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 2019 /* Unknown Microsoft Tag. */ 2020 goto out; 2021 } 2022 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 2023 size <= sizeof(struct REPARSE_POINT)) { 2024 goto out; 2025 } 2026 2027 /* Users tag. */ 2028 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 2029 ulen = le16_to_cpu(rp->ReparseDataLength) - 2030 sizeof(struct REPARSE_POINT); 2031 } 2032 2033 /* Convert nlen from bytes to UNICODE chars. */ 2034 ulen >>= 1; 2035 2036 /* Check that name is available. */ 2037 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 2038 goto out; 2039 2040 /* If name is already zero terminated then truncate it now. */ 2041 if (!uname[ulen - 1]) 2042 ulen -= 1; 2043 2044 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 2045 2046 if (err < 0) 2047 goto out; 2048 2049 /* Translate Windows '\' into Linux '/'. */ 2050 for (i = 0; i < err; i++) { 2051 if (buffer[i] == '\\') 2052 buffer[i] = '/'; 2053 } 2054 2055 /* Always set last zero. */ 2056 buffer[err] = 0; 2057 2058 /* If this is a junction, translate the link target. */ 2059 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) 2060 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen); 2061 2062 out: 2063 kfree(to_free); 2064 return err; 2065 } 2066 2067 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 2068 struct delayed_call *done) 2069 { 2070 int err; 2071 char *ret; 2072 2073 if (!de) 2074 return ERR_PTR(-ECHILD); 2075 2076 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 2077 if (!ret) 2078 return ERR_PTR(-ENOMEM); 2079 2080 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE); 2081 if (err < 0) { 2082 kfree(ret); 2083 return ERR_PTR(err); 2084 } 2085 2086 set_delayed_call(done, kfree_link, ret); 2087 2088 return ret; 2089 } 2090 2091 // clang-format off 2092 const struct inode_operations ntfs_link_inode_operations = { 2093 .get_link = ntfs_get_link, 2094 .setattr = ntfs3_setattr, 2095 .listxattr = ntfs_listxattr, 2096 }; 2097 2098 const struct address_space_operations ntfs_aops = { 2099 .read_folio = ntfs_read_folio, 2100 .readahead = ntfs_readahead, 2101 .writepages = ntfs_writepages, 2102 .write_begin = ntfs_write_begin, 2103 .write_end = ntfs_write_end, 2104 .direct_IO = ntfs_direct_IO, 2105 .bmap = ntfs_bmap, 2106 .dirty_folio = block_dirty_folio, 2107 .migrate_folio = buffer_migrate_folio, 2108 .invalidate_folio = block_invalidate_folio, 2109 }; 2110 2111 const struct address_space_operations ntfs_aops_cmpr = { 2112 .read_folio = ntfs_read_folio, 2113 .readahead = ntfs_readahead, 2114 }; 2115 // clang-format on 2116