1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 */ 7 8 #include <linux/buffer_head.h> 9 #include <linux/fs.h> 10 #include <linux/mpage.h> 11 #include <linux/namei.h> 12 #include <linux/nls.h> 13 #include <linux/uio.h> 14 #include <linux/writeback.h> 15 16 #include "debug.h" 17 #include "ntfs.h" 18 #include "ntfs_fs.h" 19 20 /* 21 * ntfs_read_mft - Read record and parse MFT. 22 */ 23 static struct inode *ntfs_read_mft(struct inode *inode, 24 const struct cpu_str *name, 25 const struct MFT_REF *ref) 26 { 27 int err = 0; 28 struct ntfs_inode *ni = ntfs_i(inode); 29 struct super_block *sb = inode->i_sb; 30 struct ntfs_sb_info *sbi = sb->s_fs_info; 31 mode_t mode = 0; 32 struct ATTR_STD_INFO5 *std5 = NULL; 33 struct ATTR_LIST_ENTRY *le; 34 struct ATTRIB *attr; 35 bool is_match = false; 36 bool is_root = false; 37 bool is_dir; 38 unsigned long ino = inode->i_ino; 39 u32 rp_fa = 0, asize, t32; 40 u16 roff, rsize, names = 0, links = 0; 41 const struct ATTR_FILE_NAME *fname = NULL; 42 const struct INDEX_ROOT *root; 43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes 44 u64 t64; 45 struct MFT_REC *rec; 46 struct runs_tree *run; 47 struct timespec64 ts; 48 49 inode->i_op = NULL; 50 /* Setup 'uid' and 'gid' */ 51 inode->i_uid = sbi->options->fs_uid; 52 inode->i_gid = sbi->options->fs_gid; 53 54 err = mi_init(&ni->mi, sbi, ino); 55 if (err) 56 goto out; 57 58 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) { 59 t64 = sbi->mft.lbo >> sbi->cluster_bits; 60 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size); 61 sbi->mft.ni = ni; 62 init_rwsem(&ni->file.run_lock); 63 64 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) { 65 err = -ENOMEM; 66 goto out; 67 } 68 } 69 70 err = mi_read(&ni->mi, ino == MFT_REC_MFT); 71 72 if (err) 73 goto out; 74 75 rec = ni->mi.mrec; 76 77 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) { 78 ; 79 } else if (ref->seq != rec->seq) { 80 err = -EINVAL; 81 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino, 82 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq)); 83 goto out; 84 } else if (!is_rec_inuse(rec)) { 85 err = -ESTALE; 86 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino); 87 goto out; 88 } 89 90 if (le32_to_cpu(rec->total) != sbi->record_size) { 91 /* Bad inode? */ 92 err = -EINVAL; 93 goto out; 94 } 95 96 if (!is_rec_base(rec)) { 97 err = -EINVAL; 98 goto out; 99 } 100 101 /* Record should contain $I30 root. */ 102 is_dir = rec->flags & RECORD_FLAG_DIR; 103 104 /* MFT_REC_MFT is not a dir */ 105 if (is_dir && ino == MFT_REC_MFT) { 106 err = -EINVAL; 107 goto out; 108 } 109 110 inode->i_generation = le16_to_cpu(rec->seq); 111 112 /* Enumerate all struct Attributes MFT. */ 113 le = NULL; 114 attr = NULL; 115 116 /* 117 * To reduce tab pressure use goto instead of 118 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) )) 119 */ 120 next_attr: 121 run = NULL; 122 err = -EINVAL; 123 attr = ni_enum_attr_ex(ni, attr, &le, NULL); 124 if (!attr) 125 goto end_enum; 126 127 if (le && le->vcn) { 128 /* This is non primary attribute segment. Ignore if not MFT. */ 129 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA) 130 goto next_attr; 131 132 run = &ni->file.run; 133 asize = le32_to_cpu(attr->size); 134 goto attr_unpack_run; 135 } 136 137 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off); 138 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size); 139 asize = le32_to_cpu(attr->size); 140 141 /* 142 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'. 143 * There not critical to check this case again 144 */ 145 if (attr->name_len && 146 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) > 147 asize) 148 goto out; 149 150 if (attr->non_res) { 151 t64 = le64_to_cpu(attr->nres.alloc_size); 152 if (le64_to_cpu(attr->nres.data_size) > t64 || 153 le64_to_cpu(attr->nres.valid_size) > t64) 154 goto out; 155 } 156 157 switch (attr->type) { 158 case ATTR_STD: 159 if (attr->non_res || 160 asize < sizeof(struct ATTR_STD_INFO) + roff || 161 rsize < sizeof(struct ATTR_STD_INFO)) 162 goto out; 163 164 if (std5) 165 goto next_attr; 166 167 std5 = Add2Ptr(attr, roff); 168 169 #ifdef STATX_BTIME 170 nt2kernel(std5->cr_time, &ni->i_crtime); 171 #endif 172 nt2kernel(std5->a_time, &ts); 173 inode_set_atime_to_ts(inode, ts); 174 nt2kernel(std5->c_time, &ts); 175 inode_set_ctime_to_ts(inode, ts); 176 nt2kernel(std5->m_time, &ts); 177 inode_set_mtime_to_ts(inode, ts); 178 179 ni->std_fa = std5->fa; 180 181 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && 182 rsize >= sizeof(struct ATTR_STD_INFO5)) 183 ni->std_security_id = std5->security_id; 184 goto next_attr; 185 186 case ATTR_LIST: 187 if (attr->name_len || le || ino == MFT_REC_LOG) 188 goto out; 189 190 err = ntfs_load_attr_list(ni, attr); 191 if (err) 192 goto out; 193 194 le = NULL; 195 attr = NULL; 196 goto next_attr; 197 198 case ATTR_NAME: 199 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || 200 rsize < SIZEOF_ATTRIBUTE_FILENAME) 201 goto out; 202 203 names += 1; 204 fname = Add2Ptr(attr, roff); 205 if (fname->type == FILE_NAME_DOS) 206 goto next_attr; 207 208 links += 1; 209 if (name && name->len == fname->name_len && 210 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, 211 NULL, false)) 212 is_match = true; 213 214 goto next_attr; 215 216 case ATTR_DATA: 217 if (is_dir) { 218 /* Ignore data attribute in dir record. */ 219 goto next_attr; 220 } 221 222 if (ino == MFT_REC_BADCLUST && !attr->non_res) 223 goto next_attr; 224 225 if (attr->name_len && 226 ((ino != MFT_REC_BADCLUST || !attr->non_res || 227 attr->name_len != ARRAY_SIZE(BAD_NAME) || 228 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && 229 (ino != MFT_REC_SECURE || !attr->non_res || 230 attr->name_len != ARRAY_SIZE(SDS_NAME) || 231 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { 232 /* File contains stream attribute. Ignore it. */ 233 goto next_attr; 234 } 235 236 if (is_attr_sparsed(attr)) 237 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; 238 else 239 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; 240 241 if (is_attr_compressed(attr)) 242 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; 243 else 244 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; 245 246 if (is_attr_encrypted(attr)) 247 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; 248 else 249 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; 250 251 if (!attr->non_res) { 252 ni->i_valid = inode->i_size = rsize; 253 inode_set_bytes(inode, rsize); 254 } 255 256 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); 257 258 if (!attr->non_res) { 259 ni->ni_flags |= NI_FLAG_RESIDENT; 260 goto next_attr; 261 } 262 263 inode_set_bytes(inode, attr_ondisk_size(attr)); 264 265 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 266 inode->i_size = le64_to_cpu(attr->nres.data_size); 267 if (!attr->nres.alloc_size) 268 goto next_attr; 269 270 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run : 271 &ni->file.run; 272 break; 273 274 case ATTR_ROOT: 275 if (attr->non_res) 276 goto out; 277 278 root = Add2Ptr(attr, roff); 279 280 if (attr->name_len != ARRAY_SIZE(I30_NAME) || 281 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 282 goto next_attr; 283 284 if (root->type != ATTR_NAME || 285 root->rule != NTFS_COLLATION_TYPE_FILENAME) 286 goto out; 287 288 if (!is_dir) 289 goto next_attr; 290 291 is_root = true; 292 ni->ni_flags |= NI_FLAG_DIR; 293 294 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 295 if (err) 296 goto out; 297 298 mode = sb->s_root ? 299 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) : 300 (S_IFDIR | 0777); 301 goto next_attr; 302 303 case ATTR_ALLOC: 304 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || 305 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 306 goto next_attr; 307 308 inode->i_size = le64_to_cpu(attr->nres.data_size); 309 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 310 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); 311 312 run = &ni->dir.alloc_run; 313 break; 314 315 case ATTR_BITMAP: 316 if (ino == MFT_REC_MFT) { 317 if (!attr->non_res) 318 goto out; 319 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 320 /* 0x20000000 = 2^32 / 8 */ 321 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) 322 goto out; 323 #endif 324 run = &sbi->mft.bitmap.run; 325 break; 326 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && 327 !memcmp(attr_name(attr), I30_NAME, 328 sizeof(I30_NAME)) && 329 attr->non_res) { 330 run = &ni->dir.bitmap_run; 331 break; 332 } 333 goto next_attr; 334 335 case ATTR_REPARSE: 336 if (attr->name_len) 337 goto next_attr; 338 339 rp_fa = ni_parse_reparse(ni, attr, &rp); 340 switch (rp_fa) { 341 case REPARSE_LINK: 342 /* 343 * Normal symlink. 344 * Assume one unicode symbol == one utf8. 345 */ 346 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer 347 .PrintNameLength) / 348 sizeof(u16); 349 ni->i_valid = inode->i_size; 350 /* Clear directory bit. */ 351 if (ni->ni_flags & NI_FLAG_DIR) { 352 indx_clear(&ni->dir); 353 memset(&ni->dir, 0, sizeof(ni->dir)); 354 ni->ni_flags &= ~NI_FLAG_DIR; 355 } else { 356 run_close(&ni->file.run); 357 } 358 mode = S_IFLNK | 0777; 359 is_dir = false; 360 if (attr->non_res) { 361 run = &ni->file.run; 362 goto attr_unpack_run; // Double break. 363 } 364 break; 365 366 case REPARSE_COMPRESSED: 367 break; 368 369 case REPARSE_DEDUPLICATED: 370 break; 371 } 372 goto next_attr; 373 374 case ATTR_EA_INFO: 375 if (!attr->name_len && 376 resident_data_ex(attr, sizeof(struct EA_INFO))) { 377 ni->ni_flags |= NI_FLAG_EA; 378 /* 379 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode 380 */ 381 inode->i_mode = mode; 382 ntfs_get_wsl_perm(inode); 383 mode = inode->i_mode; 384 } 385 goto next_attr; 386 387 default: 388 goto next_attr; 389 } 390 391 attr_unpack_run: 392 roff = le16_to_cpu(attr->nres.run_off); 393 394 if (roff > asize) { 395 err = -EINVAL; 396 goto out; 397 } 398 399 t64 = le64_to_cpu(attr->nres.svcn); 400 401 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), 402 t64, Add2Ptr(attr, roff), asize - roff); 403 if (err < 0) 404 goto out; 405 err = 0; 406 goto next_attr; 407 408 end_enum: 409 410 if (!std5) 411 goto out; 412 413 if (is_bad_inode(inode)) 414 goto out; 415 416 if (!is_match && name) { 417 err = -ENOENT; 418 goto out; 419 } 420 421 if (std5->fa & FILE_ATTRIBUTE_READONLY) 422 mode &= ~0222; 423 424 if (!names) { 425 err = -EINVAL; 426 goto out; 427 } 428 429 if (names != le16_to_cpu(rec->hard_links)) { 430 /* Correct minor error on the fly. Do not mark inode as dirty. */ 431 ntfs_inode_warn(inode, "Correct links count -> %u.", names); 432 rec->hard_links = cpu_to_le16(names); 433 ni->mi.dirty = true; 434 } 435 436 set_nlink(inode, links); 437 438 if (S_ISDIR(mode)) { 439 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; 440 441 /* 442 * Dot and dot-dot should be included in count but was not 443 * included in enumeration. 444 * Usually a hard links to directories are disabled. 445 */ 446 inode->i_op = &ntfs_dir_inode_operations; 447 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 448 &ntfs_legacy_dir_operations : 449 &ntfs_dir_operations; 450 ni->i_valid = 0; 451 } else if (S_ISLNK(mode)) { 452 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 453 inode->i_op = &ntfs_link_inode_operations; 454 inode->i_fop = NULL; 455 inode_nohighmem(inode); 456 } else if (S_ISREG(mode)) { 457 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 458 inode->i_op = &ntfs_file_inode_operations; 459 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 460 &ntfs_legacy_file_operations : 461 &ntfs_file_operations; 462 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 463 &ntfs_aops; 464 if (ino != MFT_REC_MFT) 465 init_rwsem(&ni->file.run_lock); 466 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || 467 S_ISSOCK(mode)) { 468 inode->i_op = &ntfs_special_inode_operations; 469 init_special_inode(inode, mode, inode->i_rdev); 470 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && 471 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { 472 /* Records in $Extend are not a files or general directories. */ 473 inode->i_op = &ntfs_file_inode_operations; 474 } else { 475 err = -EINVAL; 476 goto out; 477 } 478 479 if ((sbi->options->sys_immutable && 480 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 481 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 482 inode->i_flags |= S_IMMUTABLE; 483 } else { 484 inode->i_flags &= ~S_IMMUTABLE; 485 } 486 487 inode->i_mode = mode; 488 if (!(ni->ni_flags & NI_FLAG_EA)) { 489 /* If no xattr then no security (stored in xattr). */ 490 inode->i_flags |= S_NOSEC; 491 } 492 493 if (ino == MFT_REC_MFT && !sb->s_root) 494 sbi->mft.ni = NULL; 495 496 unlock_new_inode(inode); 497 498 return inode; 499 500 out: 501 if (ino == MFT_REC_MFT && !sb->s_root) 502 sbi->mft.ni = NULL; 503 504 iget_failed(inode); 505 return ERR_PTR(err); 506 } 507 508 /* 509 * ntfs_test_inode 510 * 511 * Return: 1 if match. 512 */ 513 static int ntfs_test_inode(struct inode *inode, void *data) 514 { 515 struct MFT_REF *ref = data; 516 517 return ino_get(ref) == inode->i_ino; 518 } 519 520 static int ntfs_set_inode(struct inode *inode, void *data) 521 { 522 const struct MFT_REF *ref = data; 523 524 inode->i_ino = ino_get(ref); 525 return 0; 526 } 527 528 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 529 const struct cpu_str *name) 530 { 531 struct inode *inode; 532 533 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 534 (void *)ref); 535 if (unlikely(!inode)) 536 return ERR_PTR(-ENOMEM); 537 538 /* If this is a freshly allocated inode, need to read it now. */ 539 if (inode->i_state & I_NEW) 540 inode = ntfs_read_mft(inode, name, ref); 541 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 542 /* 543 * Sequence number is not expected. 544 * Looks like inode was reused but caller uses the old reference 545 */ 546 iput(inode); 547 inode = ERR_PTR(-ESTALE); 548 } 549 550 if (IS_ERR(inode)) 551 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR); 552 553 return inode; 554 } 555 556 enum get_block_ctx { 557 GET_BLOCK_GENERAL = 0, 558 GET_BLOCK_WRITE_BEGIN = 1, 559 GET_BLOCK_DIRECT_IO_R = 2, 560 GET_BLOCK_DIRECT_IO_W = 3, 561 GET_BLOCK_BMAP = 4, 562 }; 563 564 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 565 struct buffer_head *bh, int create, 566 enum get_block_ctx ctx) 567 { 568 struct super_block *sb = inode->i_sb; 569 struct ntfs_sb_info *sbi = sb->s_fs_info; 570 struct ntfs_inode *ni = ntfs_i(inode); 571 struct folio *folio = bh->b_folio; 572 u8 cluster_bits = sbi->cluster_bits; 573 u32 block_size = sb->s_blocksize; 574 u64 bytes, lbo, valid; 575 u32 off; 576 int err; 577 CLST vcn, lcn, len; 578 bool new; 579 580 /* Clear previous state. */ 581 clear_buffer_new(bh); 582 clear_buffer_uptodate(bh); 583 584 if (is_resident(ni)) { 585 bh->b_blocknr = RESIDENT_LCN; 586 bh->b_size = block_size; 587 if (!folio) { 588 /* direct io (read) or bmap call */ 589 err = 0; 590 } else { 591 ni_lock(ni); 592 err = attr_data_read_resident(ni, folio); 593 ni_unlock(ni); 594 595 if (!err) 596 set_buffer_uptodate(bh); 597 } 598 return err; 599 } 600 601 vcn = vbo >> cluster_bits; 602 off = vbo & sbi->cluster_mask; 603 new = false; 604 605 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL, 606 create && sbi->cluster_size > PAGE_SIZE); 607 if (err) 608 goto out; 609 610 if (!len) 611 return 0; 612 613 bytes = ((u64)len << cluster_bits) - off; 614 615 if (lcn >= sbi->used.bitmap.nbits) { 616 /* This case includes resident/compressed/sparse. */ 617 if (!create) { 618 if (bh->b_size > bytes) 619 bh->b_size = bytes; 620 return 0; 621 } 622 WARN_ON(1); 623 } 624 625 if (new) 626 set_buffer_new(bh); 627 628 lbo = ((u64)lcn << cluster_bits) + off; 629 630 set_buffer_mapped(bh); 631 bh->b_bdev = sb->s_bdev; 632 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 633 634 valid = ni->i_valid; 635 636 if (ctx == GET_BLOCK_DIRECT_IO_W) { 637 /* ntfs_direct_IO will update ni->i_valid. */ 638 if (vbo >= valid) 639 set_buffer_new(bh); 640 } else if (create) { 641 /* Normal write. */ 642 if (bytes > bh->b_size) 643 bytes = bh->b_size; 644 645 if (vbo >= valid) 646 set_buffer_new(bh); 647 648 if (vbo + bytes > valid) { 649 ni->i_valid = vbo + bytes; 650 mark_inode_dirty(inode); 651 } 652 } else if (vbo >= valid) { 653 /* Read out of valid data. */ 654 clear_buffer_mapped(bh); 655 } else if (vbo + bytes <= valid) { 656 /* Normal read. */ 657 } else if (vbo + block_size <= valid) { 658 /* Normal short read. */ 659 bytes = block_size; 660 } else { 661 /* 662 * Read across valid size: vbo < valid && valid < vbo + block_size 663 */ 664 bytes = block_size; 665 666 if (folio) { 667 u32 voff = valid - vbo; 668 669 bh->b_size = block_size; 670 off = vbo & (PAGE_SIZE - 1); 671 folio_set_bh(bh, folio, off); 672 673 if (bh_read(bh, 0) < 0) { 674 err = -EIO; 675 goto out; 676 } 677 folio_zero_segment(folio, off + voff, off + block_size); 678 } 679 } 680 681 if (bh->b_size > bytes) 682 bh->b_size = bytes; 683 684 #ifndef __LP64__ 685 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 686 static_assert(sizeof(size_t) < sizeof(loff_t)); 687 if (bytes > 0x40000000u) 688 bh->b_size = 0x40000000u; 689 } 690 #endif 691 692 return 0; 693 694 out: 695 return err; 696 } 697 698 int ntfs_get_block(struct inode *inode, sector_t vbn, 699 struct buffer_head *bh_result, int create) 700 { 701 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 702 bh_result, create, GET_BLOCK_GENERAL); 703 } 704 705 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 706 struct buffer_head *bh_result, int create) 707 { 708 return ntfs_get_block_vbo(inode, 709 (u64)vsn << inode->i_sb->s_blocksize_bits, 710 bh_result, create, GET_BLOCK_BMAP); 711 } 712 713 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 714 { 715 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 716 } 717 718 static int ntfs_read_folio(struct file *file, struct folio *folio) 719 { 720 int err; 721 struct address_space *mapping = folio->mapping; 722 struct inode *inode = mapping->host; 723 struct ntfs_inode *ni = ntfs_i(inode); 724 725 if (is_resident(ni)) { 726 ni_lock(ni); 727 err = attr_data_read_resident(ni, folio); 728 ni_unlock(ni); 729 if (err != E_NTFS_NONRESIDENT) { 730 folio_unlock(folio); 731 return err; 732 } 733 } 734 735 if (is_compressed(ni)) { 736 ni_lock(ni); 737 err = ni_readpage_cmpr(ni, folio); 738 ni_unlock(ni); 739 return err; 740 } 741 742 /* Normal + sparse files. */ 743 return mpage_read_folio(folio, ntfs_get_block); 744 } 745 746 static void ntfs_readahead(struct readahead_control *rac) 747 { 748 struct address_space *mapping = rac->mapping; 749 struct inode *inode = mapping->host; 750 struct ntfs_inode *ni = ntfs_i(inode); 751 u64 valid; 752 loff_t pos; 753 754 if (is_resident(ni)) { 755 /* No readahead for resident. */ 756 return; 757 } 758 759 if (is_compressed(ni)) { 760 /* No readahead for compressed. */ 761 return; 762 } 763 764 valid = ni->i_valid; 765 pos = readahead_pos(rac); 766 767 if (valid < i_size_read(inode) && pos <= valid && 768 valid < pos + readahead_length(rac)) { 769 /* Range cross 'valid'. Read it page by page. */ 770 return; 771 } 772 773 mpage_readahead(rac, ntfs_get_block); 774 } 775 776 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 777 struct buffer_head *bh_result, int create) 778 { 779 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 780 bh_result, create, GET_BLOCK_DIRECT_IO_R); 781 } 782 783 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 784 struct buffer_head *bh_result, int create) 785 { 786 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 787 bh_result, create, GET_BLOCK_DIRECT_IO_W); 788 } 789 790 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 791 { 792 struct file *file = iocb->ki_filp; 793 struct address_space *mapping = file->f_mapping; 794 struct inode *inode = mapping->host; 795 struct ntfs_inode *ni = ntfs_i(inode); 796 loff_t vbo = iocb->ki_pos; 797 loff_t end; 798 int wr = iov_iter_rw(iter) & WRITE; 799 size_t iter_count = iov_iter_count(iter); 800 loff_t valid; 801 ssize_t ret; 802 803 if (is_resident(ni)) { 804 /* Switch to buffered write. */ 805 ret = 0; 806 goto out; 807 } 808 809 ret = blockdev_direct_IO(iocb, inode, iter, 810 wr ? ntfs_get_block_direct_IO_W : 811 ntfs_get_block_direct_IO_R); 812 813 if (ret > 0) 814 end = vbo + ret; 815 else if (wr && ret == -EIOCBQUEUED) 816 end = vbo + iter_count; 817 else 818 goto out; 819 820 valid = ni->i_valid; 821 if (wr) { 822 if (end > valid && !S_ISBLK(inode->i_mode)) { 823 ni->i_valid = end; 824 mark_inode_dirty(inode); 825 } 826 } else if (vbo < valid && valid < end) { 827 /* Fix page. */ 828 iov_iter_revert(iter, end - valid); 829 iov_iter_zero(end - valid, iter); 830 } 831 832 out: 833 return ret; 834 } 835 836 int ntfs_set_size(struct inode *inode, u64 new_size) 837 { 838 struct super_block *sb = inode->i_sb; 839 struct ntfs_sb_info *sbi = sb->s_fs_info; 840 struct ntfs_inode *ni = ntfs_i(inode); 841 int err; 842 843 /* Check for maximum file size. */ 844 if (is_sparsed(ni) || is_compressed(ni)) { 845 if (new_size > sbi->maxbytes_sparse) { 846 err = -EFBIG; 847 goto out; 848 } 849 } else if (new_size > sbi->maxbytes) { 850 err = -EFBIG; 851 goto out; 852 } 853 854 ni_lock(ni); 855 down_write(&ni->file.run_lock); 856 857 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 858 &ni->i_valid, true, NULL); 859 860 up_write(&ni->file.run_lock); 861 ni_unlock(ni); 862 863 mark_inode_dirty(inode); 864 865 out: 866 return err; 867 } 868 869 static int ntfs_resident_writepage(struct folio *folio, 870 struct writeback_control *wbc, void *data) 871 { 872 struct address_space *mapping = data; 873 struct inode *inode = mapping->host; 874 struct ntfs_inode *ni = ntfs_i(inode); 875 int ret; 876 877 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 878 return -EIO; 879 880 ni_lock(ni); 881 ret = attr_data_write_resident(ni, folio); 882 ni_unlock(ni); 883 884 if (ret != E_NTFS_NONRESIDENT) 885 folio_unlock(folio); 886 mapping_set_error(mapping, ret); 887 return ret; 888 } 889 890 static int ntfs_writepages(struct address_space *mapping, 891 struct writeback_control *wbc) 892 { 893 struct inode *inode = mapping->host; 894 895 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 896 return -EIO; 897 898 if (is_resident(ntfs_i(inode))) 899 return write_cache_pages(mapping, wbc, ntfs_resident_writepage, 900 mapping); 901 return mpage_writepages(mapping, wbc, ntfs_get_block); 902 } 903 904 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 905 struct buffer_head *bh_result, int create) 906 { 907 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 908 bh_result, create, GET_BLOCK_WRITE_BEGIN); 909 } 910 911 int ntfs_write_begin(struct file *file, struct address_space *mapping, 912 loff_t pos, u32 len, struct folio **foliop, void **fsdata) 913 { 914 int err; 915 struct inode *inode = mapping->host; 916 struct ntfs_inode *ni = ntfs_i(inode); 917 918 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 919 return -EIO; 920 921 if (is_resident(ni)) { 922 struct folio *folio = __filemap_get_folio( 923 mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN, 924 mapping_gfp_mask(mapping)); 925 926 if (IS_ERR(folio)) { 927 err = PTR_ERR(folio); 928 goto out; 929 } 930 931 ni_lock(ni); 932 err = attr_data_read_resident(ni, folio); 933 ni_unlock(ni); 934 935 if (!err) { 936 *foliop = folio; 937 goto out; 938 } 939 folio_unlock(folio); 940 folio_put(folio); 941 942 if (err != E_NTFS_NONRESIDENT) 943 goto out; 944 } 945 946 err = block_write_begin(mapping, pos, len, foliop, 947 ntfs_get_block_write_begin); 948 949 out: 950 return err; 951 } 952 953 /* 954 * ntfs_write_end - Address_space_operations::write_end. 955 */ 956 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, 957 u32 len, u32 copied, struct folio *folio, void *fsdata) 958 { 959 struct inode *inode = mapping->host; 960 struct ntfs_inode *ni = ntfs_i(inode); 961 u64 valid = ni->i_valid; 962 bool dirty = false; 963 int err; 964 965 if (is_resident(ni)) { 966 ni_lock(ni); 967 err = attr_data_write_resident(ni, folio); 968 ni_unlock(ni); 969 if (!err) { 970 struct buffer_head *head = folio_buffers(folio); 971 dirty = true; 972 /* Clear any buffers in folio. */ 973 if (head) { 974 struct buffer_head *bh = head; 975 976 do { 977 clear_buffer_dirty(bh); 978 clear_buffer_mapped(bh); 979 set_buffer_uptodate(bh); 980 } while (head != (bh = bh->b_this_page)); 981 } 982 folio_mark_uptodate(folio); 983 err = copied; 984 } 985 folio_unlock(folio); 986 folio_put(folio); 987 } else { 988 err = generic_write_end(file, mapping, pos, len, copied, folio, 989 fsdata); 990 } 991 992 if (err >= 0) { 993 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 994 inode_set_mtime_to_ts(inode, 995 inode_set_ctime_current(inode)); 996 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 997 dirty = true; 998 } 999 1000 if (valid != ni->i_valid) { 1001 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 1002 dirty = true; 1003 } 1004 1005 if (pos + err > inode->i_size) { 1006 i_size_write(inode, pos + err); 1007 dirty = true; 1008 } 1009 1010 if (dirty) 1011 mark_inode_dirty(inode); 1012 } 1013 1014 return err; 1015 } 1016 1017 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1018 { 1019 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1020 } 1021 1022 int ntfs_sync_inode(struct inode *inode) 1023 { 1024 return _ni_write_inode(inode, 1); 1025 } 1026 1027 /* 1028 * Helper function to read file. 1029 */ 1030 int inode_read_data(struct inode *inode, void *data, size_t bytes) 1031 { 1032 pgoff_t idx; 1033 struct address_space *mapping = inode->i_mapping; 1034 1035 for (idx = 0; bytes; idx++) { 1036 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1037 struct page *page = read_mapping_page(mapping, idx, NULL); 1038 void *kaddr; 1039 1040 if (IS_ERR(page)) 1041 return PTR_ERR(page); 1042 1043 kaddr = kmap_atomic(page); 1044 memcpy(data, kaddr, op); 1045 kunmap_atomic(kaddr); 1046 1047 put_page(page); 1048 1049 bytes -= op; 1050 data = Add2Ptr(data, PAGE_SIZE); 1051 } 1052 return 0; 1053 } 1054 1055 /* 1056 * ntfs_reparse_bytes 1057 * 1058 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1059 * for unicode string of @uni_len length. 1060 */ 1061 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1062 { 1063 /* Header + unicode string + decorated unicode string. */ 1064 return sizeof(short) * (2 * uni_len + 4) + 1065 offsetof(struct REPARSE_DATA_BUFFER, 1066 SymbolicLinkReparseBuffer.PathBuffer); 1067 } 1068 1069 static struct REPARSE_DATA_BUFFER * 1070 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1071 u32 size, u16 *nsize) 1072 { 1073 int i, err; 1074 struct REPARSE_DATA_BUFFER *rp; 1075 __le16 *rp_name; 1076 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1077 1078 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1079 if (!rp) 1080 return ERR_PTR(-ENOMEM); 1081 1082 rs = &rp->SymbolicLinkReparseBuffer; 1083 rp_name = rs->PathBuffer; 1084 1085 /* Convert link name to UTF-16. */ 1086 err = ntfs_nls_to_utf16(sbi, symname, size, 1087 (struct cpu_str *)(rp_name - 1), 2 * size, 1088 UTF16_LITTLE_ENDIAN); 1089 if (err < 0) 1090 goto out; 1091 1092 /* err = the length of unicode name of symlink. */ 1093 *nsize = ntfs_reparse_bytes(err); 1094 1095 if (*nsize > sbi->reparse.max_size) { 1096 err = -EFBIG; 1097 goto out; 1098 } 1099 1100 /* Translate Linux '/' into Windows '\'. */ 1101 for (i = 0; i < err; i++) { 1102 if (rp_name[i] == cpu_to_le16('/')) 1103 rp_name[i] = cpu_to_le16('\\'); 1104 } 1105 1106 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1107 rp->ReparseDataLength = 1108 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1109 SymbolicLinkReparseBuffer)); 1110 1111 /* PrintName + SubstituteName. */ 1112 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1113 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1114 rs->PrintNameLength = rs->SubstituteNameOffset; 1115 1116 /* 1117 * TODO: Use relative path if possible to allow Windows to 1118 * parse this path. 1119 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1120 */ 1121 rs->Flags = 0; 1122 1123 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1124 1125 /* Decorate SubstituteName. */ 1126 rp_name += err; 1127 rp_name[0] = cpu_to_le16('\\'); 1128 rp_name[1] = cpu_to_le16('?'); 1129 rp_name[2] = cpu_to_le16('?'); 1130 rp_name[3] = cpu_to_le16('\\'); 1131 1132 return rp; 1133 out: 1134 kfree(rp); 1135 return ERR_PTR(err); 1136 } 1137 1138 /* 1139 * ntfs_create_inode 1140 * 1141 * Helper function for: 1142 * - ntfs_create 1143 * - ntfs_mknod 1144 * - ntfs_symlink 1145 * - ntfs_mkdir 1146 * - ntfs_atomic_open 1147 * 1148 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked 1149 */ 1150 int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, 1151 struct dentry *dentry, const struct cpu_str *uni, 1152 umode_t mode, dev_t dev, const char *symname, u32 size, 1153 struct ntfs_fnd *fnd) 1154 { 1155 int err; 1156 struct super_block *sb = dir->i_sb; 1157 struct ntfs_sb_info *sbi = sb->s_fs_info; 1158 const struct qstr *name = &dentry->d_name; 1159 CLST ino = 0; 1160 struct ntfs_inode *dir_ni = ntfs_i(dir); 1161 struct ntfs_inode *ni = NULL; 1162 struct inode *inode = NULL; 1163 struct ATTRIB *attr; 1164 struct ATTR_STD_INFO5 *std5; 1165 struct ATTR_FILE_NAME *fname; 1166 struct MFT_REC *rec; 1167 u32 asize, dsize, sd_size; 1168 enum FILE_ATTRIBUTE fa; 1169 __le32 security_id = SECURITY_ID_INVALID; 1170 CLST vcn; 1171 const void *sd; 1172 u16 t16, nsize = 0, aid = 0; 1173 struct INDEX_ROOT *root, *dir_root; 1174 struct NTFS_DE *e, *new_de = NULL; 1175 struct REPARSE_DATA_BUFFER *rp = NULL; 1176 bool rp_inserted = false; 1177 1178 /* New file will be resident or non resident. */ 1179 const bool new_file_resident = 1; 1180 1181 if (!fnd) 1182 ni_lock_dir(dir_ni); 1183 1184 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1185 if (!dir_root) { 1186 err = -EINVAL; 1187 goto out1; 1188 } 1189 1190 if (S_ISDIR(mode)) { 1191 /* Use parent's directory attributes. */ 1192 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1193 FILE_ATTRIBUTE_ARCHIVE; 1194 /* 1195 * By default child directory inherits parent attributes. 1196 * Root directory is hidden + system. 1197 * Make an exception for children in root. 1198 */ 1199 if (dir->i_ino == MFT_REC_ROOT) 1200 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1201 } else if (S_ISLNK(mode)) { 1202 /* It is good idea that link should be the same type (file/dir) as target */ 1203 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1204 1205 /* 1206 * Linux: there are dir/file/symlink and so on. 1207 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1208 * It is good idea to create: 1209 * dir + reparse if 'symname' points to directory 1210 * or 1211 * file + reparse if 'symname' points to file 1212 * Unfortunately kern_path hangs if symname contains 'dir'. 1213 */ 1214 1215 /* 1216 * struct path path; 1217 * 1218 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1219 * struct inode *target = d_inode(path.dentry); 1220 * 1221 * if (S_ISDIR(target->i_mode)) 1222 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1223 * // if ( target->i_sb == sb ){ 1224 * // use relative path? 1225 * // } 1226 * path_put(&path); 1227 * } 1228 */ 1229 } else if (S_ISREG(mode)) { 1230 if (sbi->options->sparse) { 1231 /* Sparsed regular file, cause option 'sparse'. */ 1232 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1233 FILE_ATTRIBUTE_ARCHIVE; 1234 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1235 /* Compressed regular file, if parent is compressed. */ 1236 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1237 } else { 1238 /* Regular file, default attributes. */ 1239 fa = FILE_ATTRIBUTE_ARCHIVE; 1240 } 1241 } else { 1242 fa = FILE_ATTRIBUTE_ARCHIVE; 1243 } 1244 1245 /* If option "hide_dot_files" then set hidden attribute for dot files. */ 1246 if (sbi->options->hide_dot_files && name->name[0] == '.') 1247 fa |= FILE_ATTRIBUTE_HIDDEN; 1248 1249 if (!(mode & 0222)) 1250 fa |= FILE_ATTRIBUTE_READONLY; 1251 1252 /* Allocate PATH_MAX bytes. */ 1253 new_de = __getname(); 1254 if (!new_de) { 1255 err = -ENOMEM; 1256 goto out1; 1257 } 1258 1259 if (unlikely(ntfs3_forced_shutdown(sb))) { 1260 err = -EIO; 1261 goto out2; 1262 } 1263 1264 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1265 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1266 1267 /* Step 1: allocate and fill new mft record. */ 1268 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1269 if (err) 1270 goto out2; 1271 1272 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); 1273 if (IS_ERR(ni)) { 1274 err = PTR_ERR(ni); 1275 ni = NULL; 1276 goto out3; 1277 } 1278 inode = &ni->vfs_inode; 1279 inode_init_owner(idmap, inode, dir, mode); 1280 mode = inode->i_mode; 1281 1282 ni->i_crtime = current_time(inode); 1283 1284 rec = ni->mi.mrec; 1285 rec->hard_links = cpu_to_le16(1); 1286 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1287 1288 /* Get default security id. */ 1289 sd = s_default_security; 1290 sd_size = sizeof(s_default_security); 1291 1292 if (is_ntfs3(sbi)) { 1293 security_id = dir_ni->std_security_id; 1294 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1295 security_id = sbi->security.def_security_id; 1296 1297 if (security_id == SECURITY_ID_INVALID && 1298 !ntfs_insert_security(sbi, sd, sd_size, 1299 &security_id, NULL)) 1300 sbi->security.def_security_id = security_id; 1301 } 1302 } 1303 1304 /* Insert standard info. */ 1305 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1306 1307 if (security_id == SECURITY_ID_INVALID) { 1308 dsize = sizeof(struct ATTR_STD_INFO); 1309 } else { 1310 dsize = sizeof(struct ATTR_STD_INFO5); 1311 std5->security_id = security_id; 1312 ni->std_security_id = security_id; 1313 } 1314 asize = SIZEOF_RESIDENT + dsize; 1315 1316 attr->type = ATTR_STD; 1317 attr->size = cpu_to_le32(asize); 1318 attr->id = cpu_to_le16(aid++); 1319 attr->res.data_off = SIZEOF_RESIDENT_LE; 1320 attr->res.data_size = cpu_to_le32(dsize); 1321 1322 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1323 kernel2nt(&ni->i_crtime); 1324 1325 std5->fa = ni->std_fa = fa; 1326 1327 attr = Add2Ptr(attr, asize); 1328 1329 /* Insert file name. */ 1330 err = fill_name_de(sbi, new_de, name, uni); 1331 if (err) 1332 goto out4; 1333 1334 mi_get_ref(&ni->mi, &new_de->ref); 1335 1336 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1337 1338 if (sbi->options->windows_names && 1339 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) { 1340 err = -EINVAL; 1341 goto out4; 1342 } 1343 1344 mi_get_ref(&dir_ni->mi, &fname->home); 1345 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1346 fname->dup.a_time = std5->cr_time; 1347 fname->dup.alloc_size = fname->dup.data_size = 0; 1348 fname->dup.fa = std5->fa; 1349 fname->dup.ea_size = fname->dup.reparse = 0; 1350 1351 dsize = le16_to_cpu(new_de->key_size); 1352 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1353 1354 attr->type = ATTR_NAME; 1355 attr->size = cpu_to_le32(asize); 1356 attr->res.data_off = SIZEOF_RESIDENT_LE; 1357 attr->res.flags = RESIDENT_FLAG_INDEXED; 1358 attr->id = cpu_to_le16(aid++); 1359 attr->res.data_size = cpu_to_le32(dsize); 1360 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1361 1362 attr = Add2Ptr(attr, asize); 1363 1364 if (security_id == SECURITY_ID_INVALID) { 1365 /* Insert security attribute. */ 1366 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1367 1368 attr->type = ATTR_SECURE; 1369 attr->size = cpu_to_le32(asize); 1370 attr->id = cpu_to_le16(aid++); 1371 attr->res.data_off = SIZEOF_RESIDENT_LE; 1372 attr->res.data_size = cpu_to_le32(sd_size); 1373 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1374 1375 attr = Add2Ptr(attr, asize); 1376 } 1377 1378 attr->id = cpu_to_le16(aid++); 1379 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1380 /* 1381 * Regular directory or symlink to directory. 1382 * Create root attribute. 1383 */ 1384 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1385 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1386 1387 attr->type = ATTR_ROOT; 1388 attr->size = cpu_to_le32(asize); 1389 1390 attr->name_len = ARRAY_SIZE(I30_NAME); 1391 attr->name_off = SIZEOF_RESIDENT_LE; 1392 attr->res.data_off = 1393 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1394 attr->res.data_size = cpu_to_le32(dsize); 1395 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1396 sizeof(I30_NAME)); 1397 1398 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1399 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1400 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); 1401 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1402 sizeof(struct NTFS_DE)); 1403 root->ihdr.total = root->ihdr.used; 1404 1405 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1406 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1407 e->flags = NTFS_IE_LAST; 1408 } else if (S_ISLNK(mode)) { 1409 /* 1410 * Symlink to file. 1411 * Create empty resident data attribute. 1412 */ 1413 asize = SIZEOF_RESIDENT; 1414 1415 /* Insert empty ATTR_DATA */ 1416 attr->type = ATTR_DATA; 1417 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1418 attr->name_off = SIZEOF_RESIDENT_LE; 1419 attr->res.data_off = SIZEOF_RESIDENT_LE; 1420 } else if (!new_file_resident && S_ISREG(mode)) { 1421 /* 1422 * Regular file. Create empty non resident data attribute. 1423 */ 1424 attr->type = ATTR_DATA; 1425 attr->non_res = 1; 1426 attr->nres.evcn = cpu_to_le64(-1ll); 1427 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1428 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1429 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1430 attr->flags = ATTR_FLAG_SPARSED; 1431 asize = SIZEOF_NONRESIDENT_EX + 8; 1432 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1433 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1434 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1435 attr->flags = ATTR_FLAG_COMPRESSED; 1436 attr->nres.c_unit = NTFS_LZNT_CUNIT; 1437 asize = SIZEOF_NONRESIDENT_EX + 8; 1438 } else { 1439 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1440 attr->name_off = SIZEOF_NONRESIDENT_LE; 1441 asize = SIZEOF_NONRESIDENT + 8; 1442 } 1443 attr->nres.run_off = attr->name_off; 1444 } else { 1445 /* 1446 * Node. Create empty resident data attribute. 1447 */ 1448 attr->type = ATTR_DATA; 1449 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1450 attr->name_off = SIZEOF_RESIDENT_LE; 1451 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1452 attr->flags = ATTR_FLAG_SPARSED; 1453 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1454 attr->flags = ATTR_FLAG_COMPRESSED; 1455 attr->res.data_off = SIZEOF_RESIDENT_LE; 1456 asize = SIZEOF_RESIDENT; 1457 ni->ni_flags |= NI_FLAG_RESIDENT; 1458 } 1459 1460 if (S_ISDIR(mode)) { 1461 ni->ni_flags |= NI_FLAG_DIR; 1462 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1463 if (err) 1464 goto out4; 1465 } else if (S_ISLNK(mode)) { 1466 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1467 1468 if (IS_ERR(rp)) { 1469 err = PTR_ERR(rp); 1470 rp = NULL; 1471 goto out4; 1472 } 1473 1474 /* 1475 * Insert ATTR_REPARSE. 1476 */ 1477 attr = Add2Ptr(attr, asize); 1478 attr->type = ATTR_REPARSE; 1479 attr->id = cpu_to_le16(aid++); 1480 1481 /* Resident or non resident? */ 1482 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1483 t16 = PtrOffset(rec, attr); 1484 1485 /* 1486 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1487 * It is good idea to keep extended attributes resident. 1488 */ 1489 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1490 CLST alen; 1491 CLST clst = bytes_to_cluster(sbi, nsize); 1492 1493 /* Bytes per runs. */ 1494 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1495 1496 attr->non_res = 1; 1497 attr->nres.evcn = cpu_to_le64(clst - 1); 1498 attr->name_off = SIZEOF_NONRESIDENT_LE; 1499 attr->nres.run_off = attr->name_off; 1500 attr->nres.data_size = cpu_to_le64(nsize); 1501 attr->nres.valid_size = attr->nres.data_size; 1502 attr->nres.alloc_size = 1503 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1504 1505 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1506 clst, NULL, ALLOCATE_DEF, 1507 &alen, 0, NULL, NULL); 1508 if (err) 1509 goto out5; 1510 1511 err = run_pack(&ni->file.run, 0, clst, 1512 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1513 &vcn); 1514 if (err < 0) 1515 goto out5; 1516 1517 if (vcn != clst) { 1518 err = -EINVAL; 1519 goto out5; 1520 } 1521 1522 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1523 /* Write non resident data. */ 1524 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, 1525 nsize, 0); 1526 if (err) 1527 goto out5; 1528 } else { 1529 attr->res.data_off = SIZEOF_RESIDENT_LE; 1530 attr->res.data_size = cpu_to_le32(nsize); 1531 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1532 } 1533 /* Size of symlink equals the length of input string. */ 1534 inode->i_size = size; 1535 1536 attr->size = cpu_to_le32(asize); 1537 1538 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1539 &new_de->ref); 1540 if (err) 1541 goto out5; 1542 1543 rp_inserted = true; 1544 } 1545 1546 attr = Add2Ptr(attr, asize); 1547 attr->type = ATTR_END; 1548 1549 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1550 rec->next_attr_id = cpu_to_le16(aid); 1551 1552 inode->i_generation = le16_to_cpu(rec->seq); 1553 1554 if (S_ISDIR(mode)) { 1555 inode->i_op = &ntfs_dir_inode_operations; 1556 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 1557 &ntfs_legacy_dir_operations : 1558 &ntfs_dir_operations; 1559 } else if (S_ISLNK(mode)) { 1560 inode->i_op = &ntfs_link_inode_operations; 1561 inode->i_fop = NULL; 1562 inode->i_mapping->a_ops = &ntfs_aops; 1563 inode->i_size = size; 1564 inode_nohighmem(inode); 1565 } else if (S_ISREG(mode)) { 1566 inode->i_op = &ntfs_file_inode_operations; 1567 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 1568 &ntfs_legacy_file_operations : 1569 &ntfs_file_operations; 1570 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 1571 &ntfs_aops; 1572 init_rwsem(&ni->file.run_lock); 1573 } else { 1574 inode->i_op = &ntfs_special_inode_operations; 1575 init_special_inode(inode, mode, dev); 1576 } 1577 1578 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1579 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1580 err = ntfs_init_acl(idmap, inode, dir); 1581 if (err) 1582 goto out5; 1583 } else 1584 #endif 1585 { 1586 inode->i_flags |= S_NOSEC; 1587 } 1588 1589 /* 1590 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. 1591 * The packed size of extended attribute is stored in direntry too. 1592 * 'fname' here points to inside new_de. 1593 */ 1594 err = ntfs_save_wsl_perm(inode, &fname->dup.ea_size); 1595 if (err) 1596 goto out6; 1597 1598 /* 1599 * update ea_size in file_name attribute too. 1600 * Use ni_find_attr cause layout of MFT record may be changed 1601 * in ntfs_init_acl and ntfs_save_wsl_perm. 1602 */ 1603 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL); 1604 if (attr) { 1605 struct ATTR_FILE_NAME *fn; 1606 1607 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1608 if (fn) 1609 fn->dup.ea_size = fname->dup.ea_size; 1610 } 1611 1612 /* We do not need to update parent directory later */ 1613 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; 1614 1615 /* Step 2: Add new name in index. */ 1616 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1617 if (err) 1618 goto out6; 1619 1620 /* 1621 * Call 'd_instantiate' after inode->i_op is set 1622 * but before finish_open. 1623 */ 1624 d_instantiate(dentry, inode); 1625 1626 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ 1627 inode_set_atime_to_ts(inode, ni->i_crtime); 1628 inode_set_ctime_to_ts(inode, ni->i_crtime); 1629 inode_set_mtime_to_ts(inode, ni->i_crtime); 1630 inode_set_mtime_to_ts(dir, ni->i_crtime); 1631 inode_set_ctime_to_ts(dir, ni->i_crtime); 1632 1633 mark_inode_dirty(dir); 1634 mark_inode_dirty(inode); 1635 1636 /* Normal exit. */ 1637 goto out2; 1638 1639 out6: 1640 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL); 1641 if (attr && attr->non_res) { 1642 /* Delete ATTR_EA, if non-resident. */ 1643 struct runs_tree run; 1644 run_init(&run); 1645 attr_set_size(ni, ATTR_EA, NULL, 0, &run, 0, NULL, false, NULL); 1646 run_close(&run); 1647 } 1648 1649 if (rp_inserted) 1650 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1651 1652 out5: 1653 if (!S_ISDIR(mode)) 1654 run_deallocate(sbi, &ni->file.run, false); 1655 1656 out4: 1657 clear_rec_inuse(rec); 1658 clear_nlink(inode); 1659 ni->mi.dirty = false; 1660 discard_new_inode(inode); 1661 out3: 1662 ntfs_mark_rec_free(sbi, ino, false); 1663 1664 out2: 1665 __putname(new_de); 1666 kfree(rp); 1667 1668 out1: 1669 if (!fnd) 1670 ni_unlock(dir_ni); 1671 1672 if (!err) 1673 unlock_new_inode(inode); 1674 1675 return err; 1676 } 1677 1678 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1679 { 1680 int err; 1681 struct ntfs_inode *ni = ntfs_i(inode); 1682 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1683 struct NTFS_DE *de; 1684 1685 /* Allocate PATH_MAX bytes. */ 1686 de = __getname(); 1687 if (!de) 1688 return -ENOMEM; 1689 1690 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1691 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1692 1693 /* Construct 'de'. */ 1694 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1695 if (err) 1696 goto out; 1697 1698 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1699 out: 1700 __putname(de); 1701 return err; 1702 } 1703 1704 /* 1705 * ntfs_unlink_inode 1706 * 1707 * inode_operations::unlink 1708 * inode_operations::rmdir 1709 */ 1710 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1711 { 1712 int err; 1713 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1714 struct inode *inode = d_inode(dentry); 1715 struct ntfs_inode *ni = ntfs_i(inode); 1716 struct ntfs_inode *dir_ni = ntfs_i(dir); 1717 struct NTFS_DE *de, *de2 = NULL; 1718 int undo_remove; 1719 1720 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1721 return -EINVAL; 1722 1723 /* Allocate PATH_MAX bytes. */ 1724 de = __getname(); 1725 if (!de) 1726 return -ENOMEM; 1727 1728 ni_lock(ni); 1729 1730 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1731 err = -ENOTEMPTY; 1732 goto out; 1733 } 1734 1735 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1736 if (err < 0) 1737 goto out; 1738 1739 undo_remove = 0; 1740 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1741 1742 if (!err) { 1743 drop_nlink(inode); 1744 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 1745 mark_inode_dirty(dir); 1746 inode_set_ctime_to_ts(inode, inode_get_ctime(dir)); 1747 if (inode->i_nlink) 1748 mark_inode_dirty(inode); 1749 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1750 _ntfs_bad_inode(inode); 1751 } else { 1752 if (ni_is_dirty(dir)) 1753 mark_inode_dirty(dir); 1754 if (ni_is_dirty(inode)) 1755 mark_inode_dirty(inode); 1756 } 1757 1758 out: 1759 ni_unlock(ni); 1760 __putname(de); 1761 return err; 1762 } 1763 1764 void ntfs_evict_inode(struct inode *inode) 1765 { 1766 truncate_inode_pages_final(&inode->i_data); 1767 1768 invalidate_inode_buffers(inode); 1769 clear_inode(inode); 1770 1771 ni_clear(ntfs_i(inode)); 1772 } 1773 1774 /* 1775 * ntfs_translate_junction 1776 * 1777 * Translate a Windows junction target to the Linux equivalent. 1778 * On junctions, targets are always absolute (they include the drive 1779 * letter). We have no way of knowing if the target is for the current 1780 * mounted device or not so we just assume it is. 1781 */ 1782 static int ntfs_translate_junction(const struct super_block *sb, 1783 const struct dentry *link_de, char *target, 1784 int target_len, int target_max) 1785 { 1786 int tl_len, err = target_len; 1787 char *link_path_buffer = NULL, *link_path; 1788 char *translated = NULL; 1789 char *target_start; 1790 int copy_len; 1791 1792 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); 1793 if (!link_path_buffer) { 1794 err = -ENOMEM; 1795 goto out; 1796 } 1797 /* Get link path, relative to mount point */ 1798 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); 1799 if (IS_ERR(link_path)) { 1800 ntfs_err(sb, "Error getting link path"); 1801 err = -EINVAL; 1802 goto out; 1803 } 1804 1805 translated = kmalloc(PATH_MAX, GFP_NOFS); 1806 if (!translated) { 1807 err = -ENOMEM; 1808 goto out; 1809 } 1810 1811 /* Make translated path a relative path to mount point */ 1812 strcpy(translated, "./"); 1813 ++link_path; /* Skip leading / */ 1814 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) { 1815 if (*link_path == '/') { 1816 if (PATH_MAX - tl_len < sizeof("../")) { 1817 ntfs_err(sb, 1818 "Link path %s has too many components", 1819 link_path); 1820 err = -EINVAL; 1821 goto out; 1822 } 1823 strcpy(translated + tl_len, "../"); 1824 tl_len += sizeof("../") - 1; 1825 } 1826 } 1827 1828 /* Skip drive letter */ 1829 target_start = target; 1830 while (*target_start && *target_start != ':') 1831 ++target_start; 1832 1833 if (!*target_start) { 1834 ntfs_err(sb, "Link target (%s) missing drive separator", 1835 target); 1836 err = -EINVAL; 1837 goto out; 1838 } 1839 1840 /* Skip drive separator and leading /, if exists */ 1841 target_start += 1 + (target_start[1] == '/'); 1842 copy_len = target_len - (target_start - target); 1843 1844 if (PATH_MAX - tl_len <= copy_len) { 1845 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)", 1846 target_start, PATH_MAX - tl_len, copy_len); 1847 err = -EINVAL; 1848 goto out; 1849 } 1850 1851 /* translated path has a trailing / and target_start does not */ 1852 strcpy(translated + tl_len, target_start); 1853 tl_len += copy_len; 1854 if (target_max <= tl_len) { 1855 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)", 1856 translated, target_max, tl_len); 1857 err = -EINVAL; 1858 goto out; 1859 } 1860 strcpy(target, translated); 1861 err = tl_len; 1862 1863 out: 1864 kfree(link_path_buffer); 1865 kfree(translated); 1866 return err; 1867 } 1868 1869 static noinline int ntfs_readlink_hlp(const struct dentry *link_de, 1870 struct inode *inode, char *buffer, 1871 int buflen) 1872 { 1873 int i, err = -EINVAL; 1874 struct ntfs_inode *ni = ntfs_i(inode); 1875 struct super_block *sb = inode->i_sb; 1876 struct ntfs_sb_info *sbi = sb->s_fs_info; 1877 u64 size; 1878 u16 ulen = 0; 1879 void *to_free = NULL; 1880 struct REPARSE_DATA_BUFFER *rp; 1881 const __le16 *uname; 1882 struct ATTRIB *attr; 1883 1884 /* Reparse data present. Try to parse it. */ 1885 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1886 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1887 1888 *buffer = 0; 1889 1890 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1891 if (!attr) 1892 goto out; 1893 1894 if (!attr->non_res) { 1895 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1896 if (!rp) 1897 goto out; 1898 size = le32_to_cpu(attr->res.data_size); 1899 } else { 1900 size = le64_to_cpu(attr->nres.data_size); 1901 rp = NULL; 1902 } 1903 1904 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1905 goto out; 1906 1907 if (!rp) { 1908 rp = kmalloc(size, GFP_NOFS); 1909 if (!rp) { 1910 err = -ENOMEM; 1911 goto out; 1912 } 1913 to_free = rp; 1914 /* Read into temporal buffer. */ 1915 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1916 if (err) 1917 goto out; 1918 } 1919 1920 /* Microsoft Tag. */ 1921 switch (rp->ReparseTag) { 1922 case IO_REPARSE_TAG_MOUNT_POINT: 1923 /* Mount points and junctions. */ 1924 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1925 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1926 MountPointReparseBuffer.PathBuffer)) 1927 goto out; 1928 uname = Add2Ptr(rp, 1929 offsetof(struct REPARSE_DATA_BUFFER, 1930 MountPointReparseBuffer.PathBuffer) + 1931 le16_to_cpu(rp->MountPointReparseBuffer 1932 .PrintNameOffset)); 1933 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1934 break; 1935 1936 case IO_REPARSE_TAG_SYMLINK: 1937 /* FolderSymbolicLink */ 1938 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1939 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1940 SymbolicLinkReparseBuffer.PathBuffer)) 1941 goto out; 1942 uname = Add2Ptr( 1943 rp, offsetof(struct REPARSE_DATA_BUFFER, 1944 SymbolicLinkReparseBuffer.PathBuffer) + 1945 le16_to_cpu(rp->SymbolicLinkReparseBuffer 1946 .PrintNameOffset)); 1947 ulen = le16_to_cpu( 1948 rp->SymbolicLinkReparseBuffer.PrintNameLength); 1949 break; 1950 1951 case IO_REPARSE_TAG_CLOUD: 1952 case IO_REPARSE_TAG_CLOUD_1: 1953 case IO_REPARSE_TAG_CLOUD_2: 1954 case IO_REPARSE_TAG_CLOUD_3: 1955 case IO_REPARSE_TAG_CLOUD_4: 1956 case IO_REPARSE_TAG_CLOUD_5: 1957 case IO_REPARSE_TAG_CLOUD_6: 1958 case IO_REPARSE_TAG_CLOUD_7: 1959 case IO_REPARSE_TAG_CLOUD_8: 1960 case IO_REPARSE_TAG_CLOUD_9: 1961 case IO_REPARSE_TAG_CLOUD_A: 1962 case IO_REPARSE_TAG_CLOUD_B: 1963 case IO_REPARSE_TAG_CLOUD_C: 1964 case IO_REPARSE_TAG_CLOUD_D: 1965 case IO_REPARSE_TAG_CLOUD_E: 1966 case IO_REPARSE_TAG_CLOUD_F: 1967 err = sizeof("OneDrive") - 1; 1968 if (err > buflen) 1969 err = buflen; 1970 memcpy(buffer, "OneDrive", err); 1971 goto out; 1972 1973 default: 1974 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 1975 /* Unknown Microsoft Tag. */ 1976 goto out; 1977 } 1978 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 1979 size <= sizeof(struct REPARSE_POINT)) { 1980 goto out; 1981 } 1982 1983 /* Users tag. */ 1984 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 1985 ulen = le16_to_cpu(rp->ReparseDataLength) - 1986 sizeof(struct REPARSE_POINT); 1987 } 1988 1989 /* Convert nlen from bytes to UNICODE chars. */ 1990 ulen >>= 1; 1991 1992 /* Check that name is available. */ 1993 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 1994 goto out; 1995 1996 /* If name is already zero terminated then truncate it now. */ 1997 if (!uname[ulen - 1]) 1998 ulen -= 1; 1999 2000 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 2001 2002 if (err < 0) 2003 goto out; 2004 2005 /* Translate Windows '\' into Linux '/'. */ 2006 for (i = 0; i < err; i++) { 2007 if (buffer[i] == '\\') 2008 buffer[i] = '/'; 2009 } 2010 2011 /* Always set last zero. */ 2012 buffer[err] = 0; 2013 2014 /* If this is a junction, translate the link target. */ 2015 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) 2016 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen); 2017 2018 out: 2019 kfree(to_free); 2020 return err; 2021 } 2022 2023 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 2024 struct delayed_call *done) 2025 { 2026 int err; 2027 char *ret; 2028 2029 if (!de) 2030 return ERR_PTR(-ECHILD); 2031 2032 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 2033 if (!ret) 2034 return ERR_PTR(-ENOMEM); 2035 2036 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE); 2037 if (err < 0) { 2038 kfree(ret); 2039 return ERR_PTR(err); 2040 } 2041 2042 set_delayed_call(done, kfree_link, ret); 2043 2044 return ret; 2045 } 2046 2047 // clang-format off 2048 const struct inode_operations ntfs_link_inode_operations = { 2049 .get_link = ntfs_get_link, 2050 .setattr = ntfs_setattr, 2051 .listxattr = ntfs_listxattr, 2052 }; 2053 2054 const struct address_space_operations ntfs_aops = { 2055 .read_folio = ntfs_read_folio, 2056 .readahead = ntfs_readahead, 2057 .writepages = ntfs_writepages, 2058 .write_begin = ntfs_write_begin, 2059 .write_end = ntfs_write_end, 2060 .direct_IO = ntfs_direct_IO, 2061 .bmap = ntfs_bmap, 2062 .dirty_folio = block_dirty_folio, 2063 .migrate_folio = buffer_migrate_folio, 2064 .invalidate_folio = block_invalidate_folio, 2065 }; 2066 2067 const struct address_space_operations ntfs_aops_cmpr = { 2068 .read_folio = ntfs_read_folio, 2069 .readahead = ntfs_readahead, 2070 .dirty_folio = block_dirty_folio, 2071 }; 2072 // clang-format on 2073