1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 */ 7 8 #include <linux/buffer_head.h> 9 #include <linux/fs.h> 10 #include <linux/mpage.h> 11 #include <linux/namei.h> 12 #include <linux/nls.h> 13 #include <linux/uio.h> 14 #include <linux/writeback.h> 15 16 #include "debug.h" 17 #include "ntfs.h" 18 #include "ntfs_fs.h" 19 20 /* 21 * ntfs_read_mft - Read record and parses MFT. 22 */ 23 static struct inode *ntfs_read_mft(struct inode *inode, 24 const struct cpu_str *name, 25 const struct MFT_REF *ref) 26 { 27 int err = 0; 28 struct ntfs_inode *ni = ntfs_i(inode); 29 struct super_block *sb = inode->i_sb; 30 struct ntfs_sb_info *sbi = sb->s_fs_info; 31 mode_t mode = 0; 32 struct ATTR_STD_INFO5 *std5 = NULL; 33 struct ATTR_LIST_ENTRY *le; 34 struct ATTRIB *attr; 35 bool is_match = false; 36 bool is_root = false; 37 bool is_dir; 38 unsigned long ino = inode->i_ino; 39 u32 rp_fa = 0, asize, t32; 40 u16 roff, rsize, names = 0; 41 const struct ATTR_FILE_NAME *fname = NULL; 42 const struct INDEX_ROOT *root; 43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes 44 u64 t64; 45 struct MFT_REC *rec; 46 struct runs_tree *run; 47 48 inode->i_op = NULL; 49 /* Setup 'uid' and 'gid' */ 50 inode->i_uid = sbi->options->fs_uid; 51 inode->i_gid = sbi->options->fs_gid; 52 53 err = mi_init(&ni->mi, sbi, ino); 54 if (err) 55 goto out; 56 57 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) { 58 t64 = sbi->mft.lbo >> sbi->cluster_bits; 59 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size); 60 sbi->mft.ni = ni; 61 init_rwsem(&ni->file.run_lock); 62 63 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) { 64 err = -ENOMEM; 65 goto out; 66 } 67 } 68 69 err = mi_read(&ni->mi, ino == MFT_REC_MFT); 70 71 if (err) 72 goto out; 73 74 rec = ni->mi.mrec; 75 76 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) { 77 ; 78 } else if (ref->seq != rec->seq) { 79 err = -EINVAL; 80 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino, 81 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq)); 82 goto out; 83 } else if (!is_rec_inuse(rec)) { 84 err = -ESTALE; 85 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino); 86 goto out; 87 } 88 89 if (le32_to_cpu(rec->total) != sbi->record_size) { 90 /* Bad inode? */ 91 err = -EINVAL; 92 goto out; 93 } 94 95 if (!is_rec_base(rec)) { 96 err = -EINVAL; 97 goto out; 98 } 99 100 /* Record should contain $I30 root. */ 101 is_dir = rec->flags & RECORD_FLAG_DIR; 102 103 /* MFT_REC_MFT is not a dir */ 104 if (is_dir && ino == MFT_REC_MFT) { 105 err = -EINVAL; 106 goto out; 107 } 108 109 inode->i_generation = le16_to_cpu(rec->seq); 110 111 /* Enumerate all struct Attributes MFT. */ 112 le = NULL; 113 attr = NULL; 114 115 /* 116 * To reduce tab pressure use goto instead of 117 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) )) 118 */ 119 next_attr: 120 run = NULL; 121 err = -EINVAL; 122 attr = ni_enum_attr_ex(ni, attr, &le, NULL); 123 if (!attr) 124 goto end_enum; 125 126 if (le && le->vcn) { 127 /* This is non primary attribute segment. Ignore if not MFT. */ 128 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA) 129 goto next_attr; 130 131 run = &ni->file.run; 132 asize = le32_to_cpu(attr->size); 133 goto attr_unpack_run; 134 } 135 136 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off); 137 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size); 138 asize = le32_to_cpu(attr->size); 139 140 /* 141 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'. 142 * There not critical to check this case again 143 */ 144 if (attr->name_len && 145 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) > 146 asize) 147 goto out; 148 149 if (attr->non_res) { 150 t64 = le64_to_cpu(attr->nres.alloc_size); 151 if (le64_to_cpu(attr->nres.data_size) > t64 || 152 le64_to_cpu(attr->nres.valid_size) > t64) 153 goto out; 154 } 155 156 switch (attr->type) { 157 case ATTR_STD: 158 if (attr->non_res || 159 asize < sizeof(struct ATTR_STD_INFO) + roff || 160 rsize < sizeof(struct ATTR_STD_INFO)) 161 goto out; 162 163 if (std5) 164 goto next_attr; 165 166 std5 = Add2Ptr(attr, roff); 167 168 #ifdef STATX_BTIME 169 nt2kernel(std5->cr_time, &ni->i_crtime); 170 #endif 171 nt2kernel(std5->a_time, &inode->i_atime); 172 nt2kernel(std5->c_time, &inode->i_ctime); 173 nt2kernel(std5->m_time, &inode->i_mtime); 174 175 ni->std_fa = std5->fa; 176 177 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && 178 rsize >= sizeof(struct ATTR_STD_INFO5)) 179 ni->std_security_id = std5->security_id; 180 goto next_attr; 181 182 case ATTR_LIST: 183 if (attr->name_len || le || ino == MFT_REC_LOG) 184 goto out; 185 186 err = ntfs_load_attr_list(ni, attr); 187 if (err) 188 goto out; 189 190 le = NULL; 191 attr = NULL; 192 goto next_attr; 193 194 case ATTR_NAME: 195 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || 196 rsize < SIZEOF_ATTRIBUTE_FILENAME) 197 goto out; 198 199 fname = Add2Ptr(attr, roff); 200 if (fname->type == FILE_NAME_DOS) 201 goto next_attr; 202 203 names += 1; 204 if (name && name->len == fname->name_len && 205 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, 206 NULL, false)) 207 is_match = true; 208 209 goto next_attr; 210 211 case ATTR_DATA: 212 if (is_dir) { 213 /* Ignore data attribute in dir record. */ 214 goto next_attr; 215 } 216 217 if (ino == MFT_REC_BADCLUST && !attr->non_res) 218 goto next_attr; 219 220 if (attr->name_len && 221 ((ino != MFT_REC_BADCLUST || !attr->non_res || 222 attr->name_len != ARRAY_SIZE(BAD_NAME) || 223 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && 224 (ino != MFT_REC_SECURE || !attr->non_res || 225 attr->name_len != ARRAY_SIZE(SDS_NAME) || 226 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { 227 /* File contains stream attribute. Ignore it. */ 228 goto next_attr; 229 } 230 231 if (is_attr_sparsed(attr)) 232 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; 233 else 234 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; 235 236 if (is_attr_compressed(attr)) 237 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; 238 else 239 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; 240 241 if (is_attr_encrypted(attr)) 242 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; 243 else 244 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; 245 246 if (!attr->non_res) { 247 ni->i_valid = inode->i_size = rsize; 248 inode_set_bytes(inode, rsize); 249 } 250 251 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); 252 253 if (!attr->non_res) { 254 ni->ni_flags |= NI_FLAG_RESIDENT; 255 goto next_attr; 256 } 257 258 inode_set_bytes(inode, attr_ondisk_size(attr)); 259 260 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 261 inode->i_size = le64_to_cpu(attr->nres.data_size); 262 if (!attr->nres.alloc_size) 263 goto next_attr; 264 265 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run : 266 &ni->file.run; 267 break; 268 269 case ATTR_ROOT: 270 if (attr->non_res) 271 goto out; 272 273 root = Add2Ptr(attr, roff); 274 275 if (attr->name_len != ARRAY_SIZE(I30_NAME) || 276 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 277 goto next_attr; 278 279 if (root->type != ATTR_NAME || 280 root->rule != NTFS_COLLATION_TYPE_FILENAME) 281 goto out; 282 283 if (!is_dir) 284 goto next_attr; 285 286 is_root = true; 287 ni->ni_flags |= NI_FLAG_DIR; 288 289 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 290 if (err) 291 goto out; 292 293 mode = sb->s_root ? 294 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) : 295 (S_IFDIR | 0777); 296 goto next_attr; 297 298 case ATTR_ALLOC: 299 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || 300 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 301 goto next_attr; 302 303 inode->i_size = le64_to_cpu(attr->nres.data_size); 304 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 305 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); 306 307 run = &ni->dir.alloc_run; 308 break; 309 310 case ATTR_BITMAP: 311 if (ino == MFT_REC_MFT) { 312 if (!attr->non_res) 313 goto out; 314 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 315 /* 0x20000000 = 2^32 / 8 */ 316 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) 317 goto out; 318 #endif 319 run = &sbi->mft.bitmap.run; 320 break; 321 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && 322 !memcmp(attr_name(attr), I30_NAME, 323 sizeof(I30_NAME)) && 324 attr->non_res) { 325 run = &ni->dir.bitmap_run; 326 break; 327 } 328 goto next_attr; 329 330 case ATTR_REPARSE: 331 if (attr->name_len) 332 goto next_attr; 333 334 rp_fa = ni_parse_reparse(ni, attr, &rp); 335 switch (rp_fa) { 336 case REPARSE_LINK: 337 /* 338 * Normal symlink. 339 * Assume one unicode symbol == one utf8. 340 */ 341 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer 342 .PrintNameLength) / 343 sizeof(u16); 344 345 ni->i_valid = inode->i_size; 346 347 /* Clear directory bit. */ 348 if (ni->ni_flags & NI_FLAG_DIR) { 349 indx_clear(&ni->dir); 350 memset(&ni->dir, 0, sizeof(ni->dir)); 351 ni->ni_flags &= ~NI_FLAG_DIR; 352 } else { 353 run_close(&ni->file.run); 354 } 355 mode = S_IFLNK | 0777; 356 is_dir = false; 357 if (attr->non_res) { 358 run = &ni->file.run; 359 goto attr_unpack_run; // Double break. 360 } 361 break; 362 363 case REPARSE_COMPRESSED: 364 break; 365 366 case REPARSE_DEDUPLICATED: 367 break; 368 } 369 goto next_attr; 370 371 case ATTR_EA_INFO: 372 if (!attr->name_len && 373 resident_data_ex(attr, sizeof(struct EA_INFO))) { 374 ni->ni_flags |= NI_FLAG_EA; 375 /* 376 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode 377 */ 378 inode->i_mode = mode; 379 ntfs_get_wsl_perm(inode); 380 mode = inode->i_mode; 381 } 382 goto next_attr; 383 384 default: 385 goto next_attr; 386 } 387 388 attr_unpack_run: 389 roff = le16_to_cpu(attr->nres.run_off); 390 391 if (roff > asize) { 392 err = -EINVAL; 393 goto out; 394 } 395 396 t64 = le64_to_cpu(attr->nres.svcn); 397 398 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), 399 t64, Add2Ptr(attr, roff), asize - roff); 400 if (err < 0) 401 goto out; 402 err = 0; 403 goto next_attr; 404 405 end_enum: 406 407 if (!std5) 408 goto out; 409 410 if (!is_match && name) { 411 /* Reuse rec as buffer for ascii name. */ 412 err = -ENOENT; 413 goto out; 414 } 415 416 if (std5->fa & FILE_ATTRIBUTE_READONLY) 417 mode &= ~0222; 418 419 if (!names) { 420 err = -EINVAL; 421 goto out; 422 } 423 424 if (names != le16_to_cpu(rec->hard_links)) { 425 /* Correct minor error on the fly. Do not mark inode as dirty. */ 426 rec->hard_links = cpu_to_le16(names); 427 ni->mi.dirty = true; 428 } 429 430 set_nlink(inode, names); 431 432 if (S_ISDIR(mode)) { 433 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; 434 435 /* 436 * Dot and dot-dot should be included in count but was not 437 * included in enumeration. 438 * Usually a hard links to directories are disabled. 439 */ 440 inode->i_op = &ntfs_dir_inode_operations; 441 inode->i_fop = &ntfs_dir_operations; 442 ni->i_valid = 0; 443 } else if (S_ISLNK(mode)) { 444 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 445 inode->i_op = &ntfs_link_inode_operations; 446 inode->i_fop = NULL; 447 inode_nohighmem(inode); 448 } else if (S_ISREG(mode)) { 449 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 450 inode->i_op = &ntfs_file_inode_operations; 451 inode->i_fop = &ntfs_file_operations; 452 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 453 &ntfs_aops; 454 if (ino != MFT_REC_MFT) 455 init_rwsem(&ni->file.run_lock); 456 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || 457 S_ISSOCK(mode)) { 458 inode->i_op = &ntfs_special_inode_operations; 459 init_special_inode(inode, mode, inode->i_rdev); 460 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && 461 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { 462 /* Records in $Extend are not a files or general directories. */ 463 inode->i_op = &ntfs_file_inode_operations; 464 } else { 465 err = -EINVAL; 466 goto out; 467 } 468 469 if ((sbi->options->sys_immutable && 470 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 471 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 472 inode->i_flags |= S_IMMUTABLE; 473 } else { 474 inode->i_flags &= ~S_IMMUTABLE; 475 } 476 477 inode->i_mode = mode; 478 if (!(ni->ni_flags & NI_FLAG_EA)) { 479 /* If no xattr then no security (stored in xattr). */ 480 inode->i_flags |= S_NOSEC; 481 } 482 483 if (ino == MFT_REC_MFT && !sb->s_root) 484 sbi->mft.ni = NULL; 485 486 unlock_new_inode(inode); 487 488 return inode; 489 490 out: 491 if (ino == MFT_REC_MFT && !sb->s_root) 492 sbi->mft.ni = NULL; 493 494 iget_failed(inode); 495 return ERR_PTR(err); 496 } 497 498 /* 499 * ntfs_test_inode 500 * 501 * Return: 1 if match. 502 */ 503 static int ntfs_test_inode(struct inode *inode, void *data) 504 { 505 struct MFT_REF *ref = data; 506 507 return ino_get(ref) == inode->i_ino; 508 } 509 510 static int ntfs_set_inode(struct inode *inode, void *data) 511 { 512 const struct MFT_REF *ref = data; 513 514 inode->i_ino = ino_get(ref); 515 return 0; 516 } 517 518 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 519 const struct cpu_str *name) 520 { 521 struct inode *inode; 522 523 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 524 (void *)ref); 525 if (unlikely(!inode)) 526 return ERR_PTR(-ENOMEM); 527 528 /* If this is a freshly allocated inode, need to read it now. */ 529 if (inode->i_state & I_NEW) 530 inode = ntfs_read_mft(inode, name, ref); 531 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 532 /* Inode overlaps? */ 533 _ntfs_bad_inode(inode); 534 } 535 536 if (IS_ERR(inode) && name) 537 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR); 538 539 return inode; 540 } 541 542 enum get_block_ctx { 543 GET_BLOCK_GENERAL = 0, 544 GET_BLOCK_WRITE_BEGIN = 1, 545 GET_BLOCK_DIRECT_IO_R = 2, 546 GET_BLOCK_DIRECT_IO_W = 3, 547 GET_BLOCK_BMAP = 4, 548 }; 549 550 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 551 struct buffer_head *bh, int create, 552 enum get_block_ctx ctx) 553 { 554 struct super_block *sb = inode->i_sb; 555 struct ntfs_sb_info *sbi = sb->s_fs_info; 556 struct ntfs_inode *ni = ntfs_i(inode); 557 struct page *page = bh->b_page; 558 u8 cluster_bits = sbi->cluster_bits; 559 u32 block_size = sb->s_blocksize; 560 u64 bytes, lbo, valid; 561 u32 off; 562 int err; 563 CLST vcn, lcn, len; 564 bool new; 565 566 /* Clear previous state. */ 567 clear_buffer_new(bh); 568 clear_buffer_uptodate(bh); 569 570 if (is_resident(ni)) { 571 ni_lock(ni); 572 err = attr_data_read_resident(ni, page); 573 ni_unlock(ni); 574 575 if (!err) 576 set_buffer_uptodate(bh); 577 bh->b_size = block_size; 578 return err; 579 } 580 581 vcn = vbo >> cluster_bits; 582 off = vbo & sbi->cluster_mask; 583 new = false; 584 585 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL, 586 create && sbi->cluster_size > PAGE_SIZE); 587 if (err) 588 goto out; 589 590 if (!len) 591 return 0; 592 593 bytes = ((u64)len << cluster_bits) - off; 594 595 if (lcn == SPARSE_LCN) { 596 if (!create) { 597 if (bh->b_size > bytes) 598 bh->b_size = bytes; 599 return 0; 600 } 601 WARN_ON(1); 602 } 603 604 if (new) 605 set_buffer_new(bh); 606 607 lbo = ((u64)lcn << cluster_bits) + off; 608 609 set_buffer_mapped(bh); 610 bh->b_bdev = sb->s_bdev; 611 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 612 613 valid = ni->i_valid; 614 615 if (ctx == GET_BLOCK_DIRECT_IO_W) { 616 /* ntfs_direct_IO will update ni->i_valid. */ 617 if (vbo >= valid) 618 set_buffer_new(bh); 619 } else if (create) { 620 /* Normal write. */ 621 if (bytes > bh->b_size) 622 bytes = bh->b_size; 623 624 if (vbo >= valid) 625 set_buffer_new(bh); 626 627 if (vbo + bytes > valid) { 628 ni->i_valid = vbo + bytes; 629 mark_inode_dirty(inode); 630 } 631 } else if (vbo >= valid) { 632 /* Read out of valid data. */ 633 clear_buffer_mapped(bh); 634 } else if (vbo + bytes <= valid) { 635 /* Normal read. */ 636 } else if (vbo + block_size <= valid) { 637 /* Normal short read. */ 638 bytes = block_size; 639 } else { 640 /* 641 * Read across valid size: vbo < valid && valid < vbo + block_size 642 */ 643 bytes = block_size; 644 645 if (page) { 646 u32 voff = valid - vbo; 647 648 bh->b_size = block_size; 649 off = vbo & (PAGE_SIZE - 1); 650 set_bh_page(bh, page, off); 651 652 err = bh_read(bh, 0); 653 if (err < 0) 654 goto out; 655 zero_user_segment(page, off + voff, off + block_size); 656 } 657 } 658 659 if (bh->b_size > bytes) 660 bh->b_size = bytes; 661 662 #ifndef __LP64__ 663 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 664 static_assert(sizeof(size_t) < sizeof(loff_t)); 665 if (bytes > 0x40000000u) 666 bh->b_size = 0x40000000u; 667 } 668 #endif 669 670 return 0; 671 672 out: 673 return err; 674 } 675 676 int ntfs_get_block(struct inode *inode, sector_t vbn, 677 struct buffer_head *bh_result, int create) 678 { 679 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 680 bh_result, create, GET_BLOCK_GENERAL); 681 } 682 683 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 684 struct buffer_head *bh_result, int create) 685 { 686 return ntfs_get_block_vbo(inode, 687 (u64)vsn << inode->i_sb->s_blocksize_bits, 688 bh_result, create, GET_BLOCK_BMAP); 689 } 690 691 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 692 { 693 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 694 } 695 696 static int ntfs_read_folio(struct file *file, struct folio *folio) 697 { 698 struct page *page = &folio->page; 699 int err; 700 struct address_space *mapping = page->mapping; 701 struct inode *inode = mapping->host; 702 struct ntfs_inode *ni = ntfs_i(inode); 703 704 if (is_resident(ni)) { 705 ni_lock(ni); 706 err = attr_data_read_resident(ni, page); 707 ni_unlock(ni); 708 if (err != E_NTFS_NONRESIDENT) { 709 unlock_page(page); 710 return err; 711 } 712 } 713 714 if (is_compressed(ni)) { 715 ni_lock(ni); 716 err = ni_readpage_cmpr(ni, page); 717 ni_unlock(ni); 718 return err; 719 } 720 721 /* Normal + sparse files. */ 722 return mpage_read_folio(folio, ntfs_get_block); 723 } 724 725 static void ntfs_readahead(struct readahead_control *rac) 726 { 727 struct address_space *mapping = rac->mapping; 728 struct inode *inode = mapping->host; 729 struct ntfs_inode *ni = ntfs_i(inode); 730 u64 valid; 731 loff_t pos; 732 733 if (is_resident(ni)) { 734 /* No readahead for resident. */ 735 return; 736 } 737 738 if (is_compressed(ni)) { 739 /* No readahead for compressed. */ 740 return; 741 } 742 743 valid = ni->i_valid; 744 pos = readahead_pos(rac); 745 746 if (valid < i_size_read(inode) && pos <= valid && 747 valid < pos + readahead_length(rac)) { 748 /* Range cross 'valid'. Read it page by page. */ 749 return; 750 } 751 752 mpage_readahead(rac, ntfs_get_block); 753 } 754 755 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 756 struct buffer_head *bh_result, int create) 757 { 758 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 759 bh_result, create, GET_BLOCK_DIRECT_IO_R); 760 } 761 762 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 763 struct buffer_head *bh_result, int create) 764 { 765 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 766 bh_result, create, GET_BLOCK_DIRECT_IO_W); 767 } 768 769 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 770 { 771 struct file *file = iocb->ki_filp; 772 struct address_space *mapping = file->f_mapping; 773 struct inode *inode = mapping->host; 774 struct ntfs_inode *ni = ntfs_i(inode); 775 loff_t vbo = iocb->ki_pos; 776 loff_t end; 777 int wr = iov_iter_rw(iter) & WRITE; 778 size_t iter_count = iov_iter_count(iter); 779 loff_t valid; 780 ssize_t ret; 781 782 if (is_resident(ni)) { 783 /* Switch to buffered write. */ 784 ret = 0; 785 goto out; 786 } 787 788 ret = blockdev_direct_IO(iocb, inode, iter, 789 wr ? ntfs_get_block_direct_IO_W : 790 ntfs_get_block_direct_IO_R); 791 792 if (ret > 0) 793 end = vbo + ret; 794 else if (wr && ret == -EIOCBQUEUED) 795 end = vbo + iter_count; 796 else 797 goto out; 798 799 valid = ni->i_valid; 800 if (wr) { 801 if (end > valid && !S_ISBLK(inode->i_mode)) { 802 ni->i_valid = end; 803 mark_inode_dirty(inode); 804 } 805 } else if (vbo < valid && valid < end) { 806 /* Fix page. */ 807 iov_iter_revert(iter, end - valid); 808 iov_iter_zero(end - valid, iter); 809 } 810 811 out: 812 return ret; 813 } 814 815 int ntfs_set_size(struct inode *inode, u64 new_size) 816 { 817 struct super_block *sb = inode->i_sb; 818 struct ntfs_sb_info *sbi = sb->s_fs_info; 819 struct ntfs_inode *ni = ntfs_i(inode); 820 int err; 821 822 /* Check for maximum file size. */ 823 if (is_sparsed(ni) || is_compressed(ni)) { 824 if (new_size > sbi->maxbytes_sparse) { 825 err = -EFBIG; 826 goto out; 827 } 828 } else if (new_size > sbi->maxbytes) { 829 err = -EFBIG; 830 goto out; 831 } 832 833 ni_lock(ni); 834 down_write(&ni->file.run_lock); 835 836 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 837 &ni->i_valid, true, NULL); 838 839 up_write(&ni->file.run_lock); 840 ni_unlock(ni); 841 842 mark_inode_dirty(inode); 843 844 out: 845 return err; 846 } 847 848 static int ntfs_resident_writepage(struct folio *folio, 849 struct writeback_control *wbc, void *data) 850 { 851 struct address_space *mapping = data; 852 struct ntfs_inode *ni = ntfs_i(mapping->host); 853 int ret; 854 855 ni_lock(ni); 856 ret = attr_data_write_resident(ni, &folio->page); 857 ni_unlock(ni); 858 859 if (ret != E_NTFS_NONRESIDENT) 860 folio_unlock(folio); 861 mapping_set_error(mapping, ret); 862 return ret; 863 } 864 865 static int ntfs_writepages(struct address_space *mapping, 866 struct writeback_control *wbc) 867 { 868 if (is_resident(ntfs_i(mapping->host))) 869 return write_cache_pages(mapping, wbc, ntfs_resident_writepage, 870 mapping); 871 return mpage_writepages(mapping, wbc, ntfs_get_block); 872 } 873 874 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 875 struct buffer_head *bh_result, int create) 876 { 877 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 878 bh_result, create, GET_BLOCK_WRITE_BEGIN); 879 } 880 881 int ntfs_write_begin(struct file *file, struct address_space *mapping, 882 loff_t pos, u32 len, struct page **pagep, void **fsdata) 883 { 884 int err; 885 struct inode *inode = mapping->host; 886 struct ntfs_inode *ni = ntfs_i(inode); 887 888 *pagep = NULL; 889 if (is_resident(ni)) { 890 struct page *page = 891 grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT); 892 893 if (!page) { 894 err = -ENOMEM; 895 goto out; 896 } 897 898 ni_lock(ni); 899 err = attr_data_read_resident(ni, page); 900 ni_unlock(ni); 901 902 if (!err) { 903 *pagep = page; 904 goto out; 905 } 906 unlock_page(page); 907 put_page(page); 908 909 if (err != E_NTFS_NONRESIDENT) 910 goto out; 911 } 912 913 err = block_write_begin(mapping, pos, len, pagep, 914 ntfs_get_block_write_begin); 915 916 out: 917 return err; 918 } 919 920 /* 921 * ntfs_write_end - Address_space_operations::write_end. 922 */ 923 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, 924 u32 len, u32 copied, struct page *page, void *fsdata) 925 { 926 struct inode *inode = mapping->host; 927 struct ntfs_inode *ni = ntfs_i(inode); 928 u64 valid = ni->i_valid; 929 bool dirty = false; 930 int err; 931 932 if (is_resident(ni)) { 933 ni_lock(ni); 934 err = attr_data_write_resident(ni, page); 935 ni_unlock(ni); 936 if (!err) { 937 dirty = true; 938 /* Clear any buffers in page. */ 939 if (page_has_buffers(page)) { 940 struct buffer_head *head, *bh; 941 942 bh = head = page_buffers(page); 943 do { 944 clear_buffer_dirty(bh); 945 clear_buffer_mapped(bh); 946 set_buffer_uptodate(bh); 947 } while (head != (bh = bh->b_this_page)); 948 } 949 SetPageUptodate(page); 950 err = copied; 951 } 952 unlock_page(page); 953 put_page(page); 954 } else { 955 err = generic_write_end(file, mapping, pos, len, copied, page, 956 fsdata); 957 } 958 959 if (err >= 0) { 960 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 961 inode->i_ctime = inode->i_mtime = current_time(inode); 962 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 963 dirty = true; 964 } 965 966 if (valid != ni->i_valid) { 967 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 968 dirty = true; 969 } 970 971 if (pos + err > inode->i_size) { 972 inode->i_size = pos + err; 973 dirty = true; 974 } 975 976 if (dirty) 977 mark_inode_dirty(inode); 978 } 979 980 return err; 981 } 982 983 int reset_log_file(struct inode *inode) 984 { 985 int err; 986 loff_t pos = 0; 987 u32 log_size = inode->i_size; 988 struct address_space *mapping = inode->i_mapping; 989 990 for (;;) { 991 u32 len; 992 void *kaddr; 993 struct page *page; 994 995 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 996 997 err = block_write_begin(mapping, pos, len, &page, 998 ntfs_get_block_write_begin); 999 if (err) 1000 goto out; 1001 1002 kaddr = kmap_atomic(page); 1003 memset(kaddr, -1, len); 1004 kunmap_atomic(kaddr); 1005 flush_dcache_page(page); 1006 1007 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 1008 if (err < 0) 1009 goto out; 1010 pos += len; 1011 1012 if (pos >= log_size) 1013 break; 1014 balance_dirty_pages_ratelimited(mapping); 1015 } 1016 out: 1017 mark_inode_dirty_sync(inode); 1018 1019 return err; 1020 } 1021 1022 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1023 { 1024 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1025 } 1026 1027 int ntfs_sync_inode(struct inode *inode) 1028 { 1029 return _ni_write_inode(inode, 1); 1030 } 1031 1032 /* 1033 * writeback_inode - Helper function for ntfs_flush_inodes(). 1034 * 1035 * This writes both the inode and the file data blocks, waiting 1036 * for in flight data blocks before the start of the call. It 1037 * does not wait for any io started during the call. 1038 */ 1039 static int writeback_inode(struct inode *inode) 1040 { 1041 int ret = sync_inode_metadata(inode, 0); 1042 1043 if (!ret) 1044 ret = filemap_fdatawrite(inode->i_mapping); 1045 return ret; 1046 } 1047 1048 /* 1049 * ntfs_flush_inodes 1050 * 1051 * Write data and metadata corresponding to i1 and i2. The io is 1052 * started but we do not wait for any of it to finish. 1053 * 1054 * filemap_flush() is used for the block device, so if there is a dirty 1055 * page for a block already in flight, we will not wait and start the 1056 * io over again. 1057 */ 1058 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1059 struct inode *i2) 1060 { 1061 int ret = 0; 1062 1063 if (i1) 1064 ret = writeback_inode(i1); 1065 if (!ret && i2) 1066 ret = writeback_inode(i2); 1067 if (!ret) 1068 ret = sync_blockdev_nowait(sb->s_bdev); 1069 return ret; 1070 } 1071 1072 int inode_write_data(struct inode *inode, const void *data, size_t bytes) 1073 { 1074 pgoff_t idx; 1075 1076 /* Write non resident data. */ 1077 for (idx = 0; bytes; idx++) { 1078 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1079 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1080 1081 if (IS_ERR(page)) 1082 return PTR_ERR(page); 1083 1084 lock_page(page); 1085 WARN_ON(!PageUptodate(page)); 1086 ClearPageUptodate(page); 1087 1088 memcpy(page_address(page), data, op); 1089 1090 flush_dcache_page(page); 1091 SetPageUptodate(page); 1092 unlock_page(page); 1093 1094 ntfs_unmap_page(page); 1095 1096 bytes -= op; 1097 data = Add2Ptr(data, PAGE_SIZE); 1098 } 1099 return 0; 1100 } 1101 1102 /* 1103 * ntfs_reparse_bytes 1104 * 1105 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1106 * for unicode string of @uni_len length. 1107 */ 1108 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1109 { 1110 /* Header + unicode string + decorated unicode string. */ 1111 return sizeof(short) * (2 * uni_len + 4) + 1112 offsetof(struct REPARSE_DATA_BUFFER, 1113 SymbolicLinkReparseBuffer.PathBuffer); 1114 } 1115 1116 static struct REPARSE_DATA_BUFFER * 1117 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1118 u32 size, u16 *nsize) 1119 { 1120 int i, err; 1121 struct REPARSE_DATA_BUFFER *rp; 1122 __le16 *rp_name; 1123 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1124 1125 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1126 if (!rp) 1127 return ERR_PTR(-ENOMEM); 1128 1129 rs = &rp->SymbolicLinkReparseBuffer; 1130 rp_name = rs->PathBuffer; 1131 1132 /* Convert link name to UTF-16. */ 1133 err = ntfs_nls_to_utf16(sbi, symname, size, 1134 (struct cpu_str *)(rp_name - 1), 2 * size, 1135 UTF16_LITTLE_ENDIAN); 1136 if (err < 0) 1137 goto out; 1138 1139 /* err = the length of unicode name of symlink. */ 1140 *nsize = ntfs_reparse_bytes(err); 1141 1142 if (*nsize > sbi->reparse.max_size) { 1143 err = -EFBIG; 1144 goto out; 1145 } 1146 1147 /* Translate Linux '/' into Windows '\'. */ 1148 for (i = 0; i < err; i++) { 1149 if (rp_name[i] == cpu_to_le16('/')) 1150 rp_name[i] = cpu_to_le16('\\'); 1151 } 1152 1153 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1154 rp->ReparseDataLength = 1155 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1156 SymbolicLinkReparseBuffer)); 1157 1158 /* PrintName + SubstituteName. */ 1159 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1160 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1161 rs->PrintNameLength = rs->SubstituteNameOffset; 1162 1163 /* 1164 * TODO: Use relative path if possible to allow Windows to 1165 * parse this path. 1166 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1167 */ 1168 rs->Flags = 0; 1169 1170 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1171 1172 /* Decorate SubstituteName. */ 1173 rp_name += err; 1174 rp_name[0] = cpu_to_le16('\\'); 1175 rp_name[1] = cpu_to_le16('?'); 1176 rp_name[2] = cpu_to_le16('?'); 1177 rp_name[3] = cpu_to_le16('\\'); 1178 1179 return rp; 1180 out: 1181 kfree(rp); 1182 return ERR_PTR(err); 1183 } 1184 1185 /* 1186 * ntfs_create_inode 1187 * 1188 * Helper function for: 1189 * - ntfs_create 1190 * - ntfs_mknod 1191 * - ntfs_symlink 1192 * - ntfs_mkdir 1193 * - ntfs_atomic_open 1194 * 1195 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked 1196 */ 1197 struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, 1198 struct dentry *dentry, 1199 const struct cpu_str *uni, umode_t mode, 1200 dev_t dev, const char *symname, u32 size, 1201 struct ntfs_fnd *fnd) 1202 { 1203 int err; 1204 struct super_block *sb = dir->i_sb; 1205 struct ntfs_sb_info *sbi = sb->s_fs_info; 1206 const struct qstr *name = &dentry->d_name; 1207 CLST ino = 0; 1208 struct ntfs_inode *dir_ni = ntfs_i(dir); 1209 struct ntfs_inode *ni = NULL; 1210 struct inode *inode = NULL; 1211 struct ATTRIB *attr; 1212 struct ATTR_STD_INFO5 *std5; 1213 struct ATTR_FILE_NAME *fname; 1214 struct MFT_REC *rec; 1215 u32 asize, dsize, sd_size; 1216 enum FILE_ATTRIBUTE fa; 1217 __le32 security_id = SECURITY_ID_INVALID; 1218 CLST vcn; 1219 const void *sd; 1220 u16 t16, nsize = 0, aid = 0; 1221 struct INDEX_ROOT *root, *dir_root; 1222 struct NTFS_DE *e, *new_de = NULL; 1223 struct REPARSE_DATA_BUFFER *rp = NULL; 1224 bool rp_inserted = false; 1225 1226 if (!fnd) 1227 ni_lock_dir(dir_ni); 1228 1229 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1230 if (!dir_root) { 1231 err = -EINVAL; 1232 goto out1; 1233 } 1234 1235 if (S_ISDIR(mode)) { 1236 /* Use parent's directory attributes. */ 1237 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1238 FILE_ATTRIBUTE_ARCHIVE; 1239 /* 1240 * By default child directory inherits parent attributes. 1241 * Root directory is hidden + system. 1242 * Make an exception for children in root. 1243 */ 1244 if (dir->i_ino == MFT_REC_ROOT) 1245 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1246 } else if (S_ISLNK(mode)) { 1247 /* It is good idea that link should be the same type (file/dir) as target */ 1248 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1249 1250 /* 1251 * Linux: there are dir/file/symlink and so on. 1252 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1253 * It is good idea to create: 1254 * dir + reparse if 'symname' points to directory 1255 * or 1256 * file + reparse if 'symname' points to file 1257 * Unfortunately kern_path hangs if symname contains 'dir'. 1258 */ 1259 1260 /* 1261 * struct path path; 1262 * 1263 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1264 * struct inode *target = d_inode(path.dentry); 1265 * 1266 * if (S_ISDIR(target->i_mode)) 1267 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1268 * // if ( target->i_sb == sb ){ 1269 * // use relative path? 1270 * // } 1271 * path_put(&path); 1272 * } 1273 */ 1274 } else if (S_ISREG(mode)) { 1275 if (sbi->options->sparse) { 1276 /* Sparsed regular file, cause option 'sparse'. */ 1277 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1278 FILE_ATTRIBUTE_ARCHIVE; 1279 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1280 /* Compressed regular file, if parent is compressed. */ 1281 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1282 } else { 1283 /* Regular file, default attributes. */ 1284 fa = FILE_ATTRIBUTE_ARCHIVE; 1285 } 1286 } else { 1287 fa = FILE_ATTRIBUTE_ARCHIVE; 1288 } 1289 1290 /* If option "hide_dot_files" then set hidden attribute for dot files. */ 1291 if (sbi->options->hide_dot_files && name->name[0] == '.') 1292 fa |= FILE_ATTRIBUTE_HIDDEN; 1293 1294 if (!(mode & 0222)) 1295 fa |= FILE_ATTRIBUTE_READONLY; 1296 1297 /* Allocate PATH_MAX bytes. */ 1298 new_de = __getname(); 1299 if (!new_de) { 1300 err = -ENOMEM; 1301 goto out1; 1302 } 1303 1304 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1305 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1306 1307 /* Step 1: allocate and fill new mft record. */ 1308 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1309 if (err) 1310 goto out2; 1311 1312 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); 1313 if (IS_ERR(ni)) { 1314 err = PTR_ERR(ni); 1315 ni = NULL; 1316 goto out3; 1317 } 1318 inode = &ni->vfs_inode; 1319 inode_init_owner(idmap, inode, dir, mode); 1320 mode = inode->i_mode; 1321 1322 ni->i_crtime = current_time(inode); 1323 1324 rec = ni->mi.mrec; 1325 rec->hard_links = cpu_to_le16(1); 1326 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1327 1328 /* Get default security id. */ 1329 sd = s_default_security; 1330 sd_size = sizeof(s_default_security); 1331 1332 if (is_ntfs3(sbi)) { 1333 security_id = dir_ni->std_security_id; 1334 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1335 security_id = sbi->security.def_security_id; 1336 1337 if (security_id == SECURITY_ID_INVALID && 1338 !ntfs_insert_security(sbi, sd, sd_size, 1339 &security_id, NULL)) 1340 sbi->security.def_security_id = security_id; 1341 } 1342 } 1343 1344 /* Insert standard info. */ 1345 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1346 1347 if (security_id == SECURITY_ID_INVALID) { 1348 dsize = sizeof(struct ATTR_STD_INFO); 1349 } else { 1350 dsize = sizeof(struct ATTR_STD_INFO5); 1351 std5->security_id = security_id; 1352 ni->std_security_id = security_id; 1353 } 1354 asize = SIZEOF_RESIDENT + dsize; 1355 1356 attr->type = ATTR_STD; 1357 attr->size = cpu_to_le32(asize); 1358 attr->id = cpu_to_le16(aid++); 1359 attr->res.data_off = SIZEOF_RESIDENT_LE; 1360 attr->res.data_size = cpu_to_le32(dsize); 1361 1362 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1363 kernel2nt(&ni->i_crtime); 1364 1365 std5->fa = ni->std_fa = fa; 1366 1367 attr = Add2Ptr(attr, asize); 1368 1369 /* Insert file name. */ 1370 err = fill_name_de(sbi, new_de, name, uni); 1371 if (err) 1372 goto out4; 1373 1374 mi_get_ref(&ni->mi, &new_de->ref); 1375 1376 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1377 1378 if (sbi->options->windows_names && 1379 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) { 1380 err = -EINVAL; 1381 goto out4; 1382 } 1383 1384 mi_get_ref(&dir_ni->mi, &fname->home); 1385 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1386 fname->dup.a_time = std5->cr_time; 1387 fname->dup.alloc_size = fname->dup.data_size = 0; 1388 fname->dup.fa = std5->fa; 1389 fname->dup.ea_size = fname->dup.reparse = 0; 1390 1391 dsize = le16_to_cpu(new_de->key_size); 1392 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1393 1394 attr->type = ATTR_NAME; 1395 attr->size = cpu_to_le32(asize); 1396 attr->res.data_off = SIZEOF_RESIDENT_LE; 1397 attr->res.flags = RESIDENT_FLAG_INDEXED; 1398 attr->id = cpu_to_le16(aid++); 1399 attr->res.data_size = cpu_to_le32(dsize); 1400 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1401 1402 attr = Add2Ptr(attr, asize); 1403 1404 if (security_id == SECURITY_ID_INVALID) { 1405 /* Insert security attribute. */ 1406 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1407 1408 attr->type = ATTR_SECURE; 1409 attr->size = cpu_to_le32(asize); 1410 attr->id = cpu_to_le16(aid++); 1411 attr->res.data_off = SIZEOF_RESIDENT_LE; 1412 attr->res.data_size = cpu_to_le32(sd_size); 1413 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1414 1415 attr = Add2Ptr(attr, asize); 1416 } 1417 1418 attr->id = cpu_to_le16(aid++); 1419 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1420 /* 1421 * Regular directory or symlink to directory. 1422 * Create root attribute. 1423 */ 1424 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1425 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1426 1427 attr->type = ATTR_ROOT; 1428 attr->size = cpu_to_le32(asize); 1429 1430 attr->name_len = ARRAY_SIZE(I30_NAME); 1431 attr->name_off = SIZEOF_RESIDENT_LE; 1432 attr->res.data_off = 1433 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1434 attr->res.data_size = cpu_to_le32(dsize); 1435 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1436 sizeof(I30_NAME)); 1437 1438 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1439 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1440 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); 1441 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1442 sizeof(struct NTFS_DE)); 1443 root->ihdr.total = root->ihdr.used; 1444 1445 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1446 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1447 e->flags = NTFS_IE_LAST; 1448 } else if (S_ISLNK(mode)) { 1449 /* 1450 * Symlink to file. 1451 * Create empty resident data attribute. 1452 */ 1453 asize = SIZEOF_RESIDENT; 1454 1455 /* Insert empty ATTR_DATA */ 1456 attr->type = ATTR_DATA; 1457 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1458 attr->name_off = SIZEOF_RESIDENT_LE; 1459 attr->res.data_off = SIZEOF_RESIDENT_LE; 1460 } else if (S_ISREG(mode)) { 1461 /* 1462 * Regular file. Create empty non resident data attribute. 1463 */ 1464 attr->type = ATTR_DATA; 1465 attr->non_res = 1; 1466 attr->nres.evcn = cpu_to_le64(-1ll); 1467 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1468 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1469 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1470 attr->flags = ATTR_FLAG_SPARSED; 1471 asize = SIZEOF_NONRESIDENT_EX + 8; 1472 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1473 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1474 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1475 attr->flags = ATTR_FLAG_COMPRESSED; 1476 attr->nres.c_unit = COMPRESSION_UNIT; 1477 asize = SIZEOF_NONRESIDENT_EX + 8; 1478 } else { 1479 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1480 attr->name_off = SIZEOF_NONRESIDENT_LE; 1481 asize = SIZEOF_NONRESIDENT + 8; 1482 } 1483 attr->nres.run_off = attr->name_off; 1484 } else { 1485 /* 1486 * Node. Create empty resident data attribute. 1487 */ 1488 attr->type = ATTR_DATA; 1489 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1490 attr->name_off = SIZEOF_RESIDENT_LE; 1491 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1492 attr->flags = ATTR_FLAG_SPARSED; 1493 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1494 attr->flags = ATTR_FLAG_COMPRESSED; 1495 attr->res.data_off = SIZEOF_RESIDENT_LE; 1496 asize = SIZEOF_RESIDENT; 1497 ni->ni_flags |= NI_FLAG_RESIDENT; 1498 } 1499 1500 if (S_ISDIR(mode)) { 1501 ni->ni_flags |= NI_FLAG_DIR; 1502 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1503 if (err) 1504 goto out4; 1505 } else if (S_ISLNK(mode)) { 1506 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1507 1508 if (IS_ERR(rp)) { 1509 err = PTR_ERR(rp); 1510 rp = NULL; 1511 goto out4; 1512 } 1513 1514 /* 1515 * Insert ATTR_REPARSE. 1516 */ 1517 attr = Add2Ptr(attr, asize); 1518 attr->type = ATTR_REPARSE; 1519 attr->id = cpu_to_le16(aid++); 1520 1521 /* Resident or non resident? */ 1522 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1523 t16 = PtrOffset(rec, attr); 1524 1525 /* 1526 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1527 * It is good idea to keep extened attributes resident. 1528 */ 1529 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1530 CLST alen; 1531 CLST clst = bytes_to_cluster(sbi, nsize); 1532 1533 /* Bytes per runs. */ 1534 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1535 1536 attr->non_res = 1; 1537 attr->nres.evcn = cpu_to_le64(clst - 1); 1538 attr->name_off = SIZEOF_NONRESIDENT_LE; 1539 attr->nres.run_off = attr->name_off; 1540 attr->nres.data_size = cpu_to_le64(nsize); 1541 attr->nres.valid_size = attr->nres.data_size; 1542 attr->nres.alloc_size = 1543 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1544 1545 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1546 clst, NULL, ALLOCATE_DEF, 1547 &alen, 0, NULL, NULL); 1548 if (err) 1549 goto out5; 1550 1551 err = run_pack(&ni->file.run, 0, clst, 1552 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1553 &vcn); 1554 if (err < 0) 1555 goto out5; 1556 1557 if (vcn != clst) { 1558 err = -EINVAL; 1559 goto out5; 1560 } 1561 1562 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1563 /* Write non resident data. */ 1564 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, 1565 nsize, 0); 1566 if (err) 1567 goto out5; 1568 } else { 1569 attr->res.data_off = SIZEOF_RESIDENT_LE; 1570 attr->res.data_size = cpu_to_le32(nsize); 1571 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1572 } 1573 /* Size of symlink equals the length of input string. */ 1574 inode->i_size = size; 1575 1576 attr->size = cpu_to_le32(asize); 1577 1578 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1579 &new_de->ref); 1580 if (err) 1581 goto out5; 1582 1583 rp_inserted = true; 1584 } 1585 1586 attr = Add2Ptr(attr, asize); 1587 attr->type = ATTR_END; 1588 1589 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1590 rec->next_attr_id = cpu_to_le16(aid); 1591 1592 inode->i_generation = le16_to_cpu(rec->seq); 1593 1594 if (S_ISDIR(mode)) { 1595 inode->i_op = &ntfs_dir_inode_operations; 1596 inode->i_fop = &ntfs_dir_operations; 1597 } else if (S_ISLNK(mode)) { 1598 inode->i_op = &ntfs_link_inode_operations; 1599 inode->i_fop = NULL; 1600 inode->i_mapping->a_ops = &ntfs_aops; 1601 inode->i_size = size; 1602 inode_nohighmem(inode); 1603 } else if (S_ISREG(mode)) { 1604 inode->i_op = &ntfs_file_inode_operations; 1605 inode->i_fop = &ntfs_file_operations; 1606 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 1607 &ntfs_aops; 1608 init_rwsem(&ni->file.run_lock); 1609 } else { 1610 inode->i_op = &ntfs_special_inode_operations; 1611 init_special_inode(inode, mode, dev); 1612 } 1613 1614 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1615 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1616 err = ntfs_init_acl(idmap, inode, dir); 1617 if (err) 1618 goto out5; 1619 } else 1620 #endif 1621 { 1622 inode->i_flags |= S_NOSEC; 1623 } 1624 1625 /* 1626 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. 1627 * The packed size of extended attribute is stored in direntry too. 1628 * 'fname' here points to inside new_de. 1629 */ 1630 ntfs_save_wsl_perm(inode, &fname->dup.ea_size); 1631 1632 /* 1633 * update ea_size in file_name attribute too. 1634 * Use ni_find_attr cause layout of MFT record may be changed 1635 * in ntfs_init_acl and ntfs_save_wsl_perm. 1636 */ 1637 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL); 1638 if (attr) { 1639 struct ATTR_FILE_NAME *fn; 1640 1641 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1642 if (fn) 1643 fn->dup.ea_size = fname->dup.ea_size; 1644 } 1645 1646 /* We do not need to update parent directory later */ 1647 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; 1648 1649 /* Step 2: Add new name in index. */ 1650 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1651 if (err) 1652 goto out6; 1653 1654 /* 1655 * Call 'd_instantiate' after inode->i_op is set 1656 * but before finish_open. 1657 */ 1658 d_instantiate(dentry, inode); 1659 1660 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ 1661 inode->i_atime = inode->i_mtime = inode->i_ctime = dir->i_mtime = 1662 dir->i_ctime = ni->i_crtime; 1663 1664 mark_inode_dirty(dir); 1665 mark_inode_dirty(inode); 1666 1667 /* Normal exit. */ 1668 goto out2; 1669 1670 out6: 1671 if (rp_inserted) 1672 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1673 1674 out5: 1675 if (!S_ISDIR(mode)) 1676 run_deallocate(sbi, &ni->file.run, false); 1677 1678 out4: 1679 clear_rec_inuse(rec); 1680 clear_nlink(inode); 1681 ni->mi.dirty = false; 1682 discard_new_inode(inode); 1683 out3: 1684 ntfs_mark_rec_free(sbi, ino, false); 1685 1686 out2: 1687 __putname(new_de); 1688 kfree(rp); 1689 1690 out1: 1691 if (!fnd) 1692 ni_unlock(dir_ni); 1693 1694 if (err) 1695 return ERR_PTR(err); 1696 1697 unlock_new_inode(inode); 1698 1699 return inode; 1700 } 1701 1702 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1703 { 1704 int err; 1705 struct ntfs_inode *ni = ntfs_i(inode); 1706 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1707 struct NTFS_DE *de; 1708 1709 /* Allocate PATH_MAX bytes. */ 1710 de = __getname(); 1711 if (!de) 1712 return -ENOMEM; 1713 1714 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1715 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1716 1717 /* Construct 'de'. */ 1718 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1719 if (err) 1720 goto out; 1721 1722 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1723 out: 1724 __putname(de); 1725 return err; 1726 } 1727 1728 /* 1729 * ntfs_unlink_inode 1730 * 1731 * inode_operations::unlink 1732 * inode_operations::rmdir 1733 */ 1734 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1735 { 1736 int err; 1737 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1738 struct inode *inode = d_inode(dentry); 1739 struct ntfs_inode *ni = ntfs_i(inode); 1740 struct ntfs_inode *dir_ni = ntfs_i(dir); 1741 struct NTFS_DE *de, *de2 = NULL; 1742 int undo_remove; 1743 1744 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1745 return -EINVAL; 1746 1747 /* Allocate PATH_MAX bytes. */ 1748 de = __getname(); 1749 if (!de) 1750 return -ENOMEM; 1751 1752 ni_lock(ni); 1753 1754 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1755 err = -ENOTEMPTY; 1756 goto out; 1757 } 1758 1759 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1760 if (err < 0) 1761 goto out; 1762 1763 undo_remove = 0; 1764 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1765 1766 if (!err) { 1767 drop_nlink(inode); 1768 dir->i_mtime = dir->i_ctime = current_time(dir); 1769 mark_inode_dirty(dir); 1770 inode->i_ctime = dir->i_ctime; 1771 if (inode->i_nlink) 1772 mark_inode_dirty(inode); 1773 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1774 _ntfs_bad_inode(inode); 1775 } else { 1776 if (ni_is_dirty(dir)) 1777 mark_inode_dirty(dir); 1778 if (ni_is_dirty(inode)) 1779 mark_inode_dirty(inode); 1780 } 1781 1782 out: 1783 ni_unlock(ni); 1784 __putname(de); 1785 return err; 1786 } 1787 1788 void ntfs_evict_inode(struct inode *inode) 1789 { 1790 truncate_inode_pages_final(&inode->i_data); 1791 1792 invalidate_inode_buffers(inode); 1793 clear_inode(inode); 1794 1795 ni_clear(ntfs_i(inode)); 1796 } 1797 1798 /* 1799 * ntfs_translate_junction 1800 * 1801 * Translate a Windows junction target to the Linux equivalent. 1802 * On junctions, targets are always absolute (they include the drive 1803 * letter). We have no way of knowing if the target is for the current 1804 * mounted device or not so we just assume it is. 1805 */ 1806 static int ntfs_translate_junction(const struct super_block *sb, 1807 const struct dentry *link_de, char *target, 1808 int target_len, int target_max) 1809 { 1810 int tl_len, err = target_len; 1811 char *link_path_buffer = NULL, *link_path; 1812 char *translated = NULL; 1813 char *target_start; 1814 int copy_len; 1815 1816 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); 1817 if (!link_path_buffer) { 1818 err = -ENOMEM; 1819 goto out; 1820 } 1821 /* Get link path, relative to mount point */ 1822 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); 1823 if (IS_ERR(link_path)) { 1824 ntfs_err(sb, "Error getting link path"); 1825 err = -EINVAL; 1826 goto out; 1827 } 1828 1829 translated = kmalloc(PATH_MAX, GFP_NOFS); 1830 if (!translated) { 1831 err = -ENOMEM; 1832 goto out; 1833 } 1834 1835 /* Make translated path a relative path to mount point */ 1836 strcpy(translated, "./"); 1837 ++link_path; /* Skip leading / */ 1838 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) { 1839 if (*link_path == '/') { 1840 if (PATH_MAX - tl_len < sizeof("../")) { 1841 ntfs_err(sb, 1842 "Link path %s has too many components", 1843 link_path); 1844 err = -EINVAL; 1845 goto out; 1846 } 1847 strcpy(translated + tl_len, "../"); 1848 tl_len += sizeof("../") - 1; 1849 } 1850 } 1851 1852 /* Skip drive letter */ 1853 target_start = target; 1854 while (*target_start && *target_start != ':') 1855 ++target_start; 1856 1857 if (!*target_start) { 1858 ntfs_err(sb, "Link target (%s) missing drive separator", 1859 target); 1860 err = -EINVAL; 1861 goto out; 1862 } 1863 1864 /* Skip drive separator and leading /, if exists */ 1865 target_start += 1 + (target_start[1] == '/'); 1866 copy_len = target_len - (target_start - target); 1867 1868 if (PATH_MAX - tl_len <= copy_len) { 1869 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)", 1870 target_start, PATH_MAX - tl_len, copy_len); 1871 err = -EINVAL; 1872 goto out; 1873 } 1874 1875 /* translated path has a trailing / and target_start does not */ 1876 strcpy(translated + tl_len, target_start); 1877 tl_len += copy_len; 1878 if (target_max <= tl_len) { 1879 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)", 1880 translated, target_max, tl_len); 1881 err = -EINVAL; 1882 goto out; 1883 } 1884 strcpy(target, translated); 1885 err = tl_len; 1886 1887 out: 1888 kfree(link_path_buffer); 1889 kfree(translated); 1890 return err; 1891 } 1892 1893 static noinline int ntfs_readlink_hlp(const struct dentry *link_de, 1894 struct inode *inode, char *buffer, 1895 int buflen) 1896 { 1897 int i, err = -EINVAL; 1898 struct ntfs_inode *ni = ntfs_i(inode); 1899 struct super_block *sb = inode->i_sb; 1900 struct ntfs_sb_info *sbi = sb->s_fs_info; 1901 u64 size; 1902 u16 ulen = 0; 1903 void *to_free = NULL; 1904 struct REPARSE_DATA_BUFFER *rp; 1905 const __le16 *uname; 1906 struct ATTRIB *attr; 1907 1908 /* Reparse data present. Try to parse it. */ 1909 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1910 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1911 1912 *buffer = 0; 1913 1914 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1915 if (!attr) 1916 goto out; 1917 1918 if (!attr->non_res) { 1919 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1920 if (!rp) 1921 goto out; 1922 size = le32_to_cpu(attr->res.data_size); 1923 } else { 1924 size = le64_to_cpu(attr->nres.data_size); 1925 rp = NULL; 1926 } 1927 1928 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1929 goto out; 1930 1931 if (!rp) { 1932 rp = kmalloc(size, GFP_NOFS); 1933 if (!rp) { 1934 err = -ENOMEM; 1935 goto out; 1936 } 1937 to_free = rp; 1938 /* Read into temporal buffer. */ 1939 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1940 if (err) 1941 goto out; 1942 } 1943 1944 /* Microsoft Tag. */ 1945 switch (rp->ReparseTag) { 1946 case IO_REPARSE_TAG_MOUNT_POINT: 1947 /* Mount points and junctions. */ 1948 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1949 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1950 MountPointReparseBuffer.PathBuffer)) 1951 goto out; 1952 uname = Add2Ptr(rp, 1953 offsetof(struct REPARSE_DATA_BUFFER, 1954 MountPointReparseBuffer.PathBuffer) + 1955 le16_to_cpu(rp->MountPointReparseBuffer 1956 .PrintNameOffset)); 1957 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1958 break; 1959 1960 case IO_REPARSE_TAG_SYMLINK: 1961 /* FolderSymbolicLink */ 1962 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1963 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1964 SymbolicLinkReparseBuffer.PathBuffer)) 1965 goto out; 1966 uname = Add2Ptr( 1967 rp, offsetof(struct REPARSE_DATA_BUFFER, 1968 SymbolicLinkReparseBuffer.PathBuffer) + 1969 le16_to_cpu(rp->SymbolicLinkReparseBuffer 1970 .PrintNameOffset)); 1971 ulen = le16_to_cpu( 1972 rp->SymbolicLinkReparseBuffer.PrintNameLength); 1973 break; 1974 1975 case IO_REPARSE_TAG_CLOUD: 1976 case IO_REPARSE_TAG_CLOUD_1: 1977 case IO_REPARSE_TAG_CLOUD_2: 1978 case IO_REPARSE_TAG_CLOUD_3: 1979 case IO_REPARSE_TAG_CLOUD_4: 1980 case IO_REPARSE_TAG_CLOUD_5: 1981 case IO_REPARSE_TAG_CLOUD_6: 1982 case IO_REPARSE_TAG_CLOUD_7: 1983 case IO_REPARSE_TAG_CLOUD_8: 1984 case IO_REPARSE_TAG_CLOUD_9: 1985 case IO_REPARSE_TAG_CLOUD_A: 1986 case IO_REPARSE_TAG_CLOUD_B: 1987 case IO_REPARSE_TAG_CLOUD_C: 1988 case IO_REPARSE_TAG_CLOUD_D: 1989 case IO_REPARSE_TAG_CLOUD_E: 1990 case IO_REPARSE_TAG_CLOUD_F: 1991 err = sizeof("OneDrive") - 1; 1992 if (err > buflen) 1993 err = buflen; 1994 memcpy(buffer, "OneDrive", err); 1995 goto out; 1996 1997 default: 1998 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 1999 /* Unknown Microsoft Tag. */ 2000 goto out; 2001 } 2002 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 2003 size <= sizeof(struct REPARSE_POINT)) { 2004 goto out; 2005 } 2006 2007 /* Users tag. */ 2008 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 2009 ulen = le16_to_cpu(rp->ReparseDataLength) - 2010 sizeof(struct REPARSE_POINT); 2011 } 2012 2013 /* Convert nlen from bytes to UNICODE chars. */ 2014 ulen >>= 1; 2015 2016 /* Check that name is available. */ 2017 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 2018 goto out; 2019 2020 /* If name is already zero terminated then truncate it now. */ 2021 if (!uname[ulen - 1]) 2022 ulen -= 1; 2023 2024 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 2025 2026 if (err < 0) 2027 goto out; 2028 2029 /* Translate Windows '\' into Linux '/'. */ 2030 for (i = 0; i < err; i++) { 2031 if (buffer[i] == '\\') 2032 buffer[i] = '/'; 2033 } 2034 2035 /* Always set last zero. */ 2036 buffer[err] = 0; 2037 2038 /* If this is a junction, translate the link target. */ 2039 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) 2040 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen); 2041 2042 out: 2043 kfree(to_free); 2044 return err; 2045 } 2046 2047 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 2048 struct delayed_call *done) 2049 { 2050 int err; 2051 char *ret; 2052 2053 if (!de) 2054 return ERR_PTR(-ECHILD); 2055 2056 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 2057 if (!ret) 2058 return ERR_PTR(-ENOMEM); 2059 2060 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE); 2061 if (err < 0) { 2062 kfree(ret); 2063 return ERR_PTR(err); 2064 } 2065 2066 set_delayed_call(done, kfree_link, ret); 2067 2068 return ret; 2069 } 2070 2071 // clang-format off 2072 const struct inode_operations ntfs_link_inode_operations = { 2073 .get_link = ntfs_get_link, 2074 .setattr = ntfs3_setattr, 2075 .listxattr = ntfs_listxattr, 2076 }; 2077 2078 const struct address_space_operations ntfs_aops = { 2079 .read_folio = ntfs_read_folio, 2080 .readahead = ntfs_readahead, 2081 .writepages = ntfs_writepages, 2082 .write_begin = ntfs_write_begin, 2083 .write_end = ntfs_write_end, 2084 .direct_IO = ntfs_direct_IO, 2085 .bmap = ntfs_bmap, 2086 .dirty_folio = block_dirty_folio, 2087 .migrate_folio = buffer_migrate_folio, 2088 .invalidate_folio = block_invalidate_folio, 2089 }; 2090 2091 const struct address_space_operations ntfs_aops_cmpr = { 2092 .read_folio = ntfs_read_folio, 2093 .readahead = ntfs_readahead, 2094 }; 2095 // clang-format on 2096