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