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, 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 ctime; 48 49 inode->i_op = NULL; 50 /* Setup 'uid' and 'gid' */ 51 inode->i_uid = sbi->options->fs_uid; 52 inode->i_gid = sbi->options->fs_gid; 53 54 err = mi_init(&ni->mi, sbi, ino); 55 if (err) 56 goto out; 57 58 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) { 59 t64 = sbi->mft.lbo >> sbi->cluster_bits; 60 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size); 61 sbi->mft.ni = ni; 62 init_rwsem(&ni->file.run_lock); 63 64 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) { 65 err = -ENOMEM; 66 goto out; 67 } 68 } 69 70 err = mi_read(&ni->mi, ino == MFT_REC_MFT); 71 72 if (err) 73 goto out; 74 75 rec = ni->mi.mrec; 76 77 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) { 78 ; 79 } else if (ref->seq != rec->seq) { 80 err = -EINVAL; 81 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino, 82 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq)); 83 goto out; 84 } else if (!is_rec_inuse(rec)) { 85 err = -ESTALE; 86 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino); 87 goto out; 88 } 89 90 if (le32_to_cpu(rec->total) != sbi->record_size) { 91 /* Bad inode? */ 92 err = -EINVAL; 93 goto out; 94 } 95 96 if (!is_rec_base(rec)) { 97 err = -EINVAL; 98 goto out; 99 } 100 101 /* Record should contain $I30 root. */ 102 is_dir = rec->flags & RECORD_FLAG_DIR; 103 104 /* MFT_REC_MFT is not a dir */ 105 if (is_dir && ino == MFT_REC_MFT) { 106 err = -EINVAL; 107 goto out; 108 } 109 110 inode->i_generation = le16_to_cpu(rec->seq); 111 112 /* Enumerate all struct Attributes MFT. */ 113 le = NULL; 114 attr = NULL; 115 116 /* 117 * To reduce tab pressure use goto instead of 118 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) )) 119 */ 120 next_attr: 121 run = NULL; 122 err = -EINVAL; 123 attr = ni_enum_attr_ex(ni, attr, &le, NULL); 124 if (!attr) 125 goto end_enum; 126 127 if (le && le->vcn) { 128 /* This is non primary attribute segment. Ignore if not MFT. */ 129 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA) 130 goto next_attr; 131 132 run = &ni->file.run; 133 asize = le32_to_cpu(attr->size); 134 goto attr_unpack_run; 135 } 136 137 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off); 138 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size); 139 asize = le32_to_cpu(attr->size); 140 141 /* 142 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'. 143 * There not critical to check this case again 144 */ 145 if (attr->name_len && 146 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) > 147 asize) 148 goto out; 149 150 if (attr->non_res) { 151 t64 = le64_to_cpu(attr->nres.alloc_size); 152 if (le64_to_cpu(attr->nres.data_size) > t64 || 153 le64_to_cpu(attr->nres.valid_size) > t64) 154 goto out; 155 } 156 157 switch (attr->type) { 158 case ATTR_STD: 159 if (attr->non_res || 160 asize < sizeof(struct ATTR_STD_INFO) + roff || 161 rsize < sizeof(struct ATTR_STD_INFO)) 162 goto out; 163 164 if (std5) 165 goto next_attr; 166 167 std5 = Add2Ptr(attr, roff); 168 169 #ifdef STATX_BTIME 170 nt2kernel(std5->cr_time, &ni->i_crtime); 171 #endif 172 nt2kernel(std5->a_time, &inode->i_atime); 173 nt2kernel(std5->c_time, &ctime); 174 inode_set_ctime_to_ts(inode, ctime); 175 nt2kernel(std5->m_time, &inode->i_mtime); 176 177 ni->std_fa = std5->fa; 178 179 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && 180 rsize >= sizeof(struct ATTR_STD_INFO5)) 181 ni->std_security_id = std5->security_id; 182 goto next_attr; 183 184 case ATTR_LIST: 185 if (attr->name_len || le || ino == MFT_REC_LOG) 186 goto out; 187 188 err = ntfs_load_attr_list(ni, attr); 189 if (err) 190 goto out; 191 192 le = NULL; 193 attr = NULL; 194 goto next_attr; 195 196 case ATTR_NAME: 197 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || 198 rsize < SIZEOF_ATTRIBUTE_FILENAME) 199 goto out; 200 201 names += 1; 202 fname = Add2Ptr(attr, roff); 203 if (fname->type == FILE_NAME_DOS) 204 goto next_attr; 205 206 links += 1; 207 if (name && name->len == fname->name_len && 208 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, 209 NULL, false)) 210 is_match = true; 211 212 goto next_attr; 213 214 case ATTR_DATA: 215 if (is_dir) { 216 /* Ignore data attribute in dir record. */ 217 goto next_attr; 218 } 219 220 if (ino == MFT_REC_BADCLUST && !attr->non_res) 221 goto next_attr; 222 223 if (attr->name_len && 224 ((ino != MFT_REC_BADCLUST || !attr->non_res || 225 attr->name_len != ARRAY_SIZE(BAD_NAME) || 226 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && 227 (ino != MFT_REC_SECURE || !attr->non_res || 228 attr->name_len != ARRAY_SIZE(SDS_NAME) || 229 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { 230 /* File contains stream attribute. Ignore it. */ 231 goto next_attr; 232 } 233 234 if (is_attr_sparsed(attr)) 235 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; 236 else 237 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; 238 239 if (is_attr_compressed(attr)) 240 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; 241 else 242 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; 243 244 if (is_attr_encrypted(attr)) 245 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; 246 else 247 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; 248 249 if (!attr->non_res) { 250 ni->i_valid = inode->i_size = rsize; 251 inode_set_bytes(inode, rsize); 252 } 253 254 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); 255 256 if (!attr->non_res) { 257 ni->ni_flags |= NI_FLAG_RESIDENT; 258 goto next_attr; 259 } 260 261 inode_set_bytes(inode, attr_ondisk_size(attr)); 262 263 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 264 inode->i_size = le64_to_cpu(attr->nres.data_size); 265 if (!attr->nres.alloc_size) 266 goto next_attr; 267 268 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run : 269 &ni->file.run; 270 break; 271 272 case ATTR_ROOT: 273 if (attr->non_res) 274 goto out; 275 276 root = Add2Ptr(attr, roff); 277 278 if (attr->name_len != ARRAY_SIZE(I30_NAME) || 279 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 280 goto next_attr; 281 282 if (root->type != ATTR_NAME || 283 root->rule != NTFS_COLLATION_TYPE_FILENAME) 284 goto out; 285 286 if (!is_dir) 287 goto next_attr; 288 289 is_root = true; 290 ni->ni_flags |= NI_FLAG_DIR; 291 292 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 293 if (err) 294 goto out; 295 296 mode = sb->s_root ? 297 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) : 298 (S_IFDIR | 0777); 299 goto next_attr; 300 301 case ATTR_ALLOC: 302 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || 303 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 304 goto next_attr; 305 306 inode->i_size = le64_to_cpu(attr->nres.data_size); 307 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 308 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); 309 310 run = &ni->dir.alloc_run; 311 break; 312 313 case ATTR_BITMAP: 314 if (ino == MFT_REC_MFT) { 315 if (!attr->non_res) 316 goto out; 317 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 318 /* 0x20000000 = 2^32 / 8 */ 319 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) 320 goto out; 321 #endif 322 run = &sbi->mft.bitmap.run; 323 break; 324 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && 325 !memcmp(attr_name(attr), I30_NAME, 326 sizeof(I30_NAME)) && 327 attr->non_res) { 328 run = &ni->dir.bitmap_run; 329 break; 330 } 331 goto next_attr; 332 333 case ATTR_REPARSE: 334 if (attr->name_len) 335 goto next_attr; 336 337 rp_fa = ni_parse_reparse(ni, attr, &rp); 338 switch (rp_fa) { 339 case REPARSE_LINK: 340 /* 341 * Normal symlink. 342 * Assume one unicode symbol == one utf8. 343 */ 344 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer 345 .PrintNameLength) / 346 sizeof(u16); 347 348 ni->i_valid = inode->i_size; 349 350 /* Clear directory bit. */ 351 if (ni->ni_flags & NI_FLAG_DIR) { 352 indx_clear(&ni->dir); 353 memset(&ni->dir, 0, sizeof(ni->dir)); 354 ni->ni_flags &= ~NI_FLAG_DIR; 355 } else { 356 run_close(&ni->file.run); 357 } 358 mode = S_IFLNK | 0777; 359 is_dir = false; 360 if (attr->non_res) { 361 run = &ni->file.run; 362 goto attr_unpack_run; // Double break. 363 } 364 break; 365 366 case REPARSE_COMPRESSED: 367 break; 368 369 case REPARSE_DEDUPLICATED: 370 break; 371 } 372 goto next_attr; 373 374 case ATTR_EA_INFO: 375 if (!attr->name_len && 376 resident_data_ex(attr, sizeof(struct EA_INFO))) { 377 ni->ni_flags |= NI_FLAG_EA; 378 /* 379 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode 380 */ 381 inode->i_mode = mode; 382 ntfs_get_wsl_perm(inode); 383 mode = inode->i_mode; 384 } 385 goto next_attr; 386 387 default: 388 goto next_attr; 389 } 390 391 attr_unpack_run: 392 roff = le16_to_cpu(attr->nres.run_off); 393 394 if (roff > asize) { 395 err = -EINVAL; 396 goto out; 397 } 398 399 t64 = le64_to_cpu(attr->nres.svcn); 400 401 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), 402 t64, Add2Ptr(attr, roff), asize - roff); 403 if (err < 0) 404 goto out; 405 err = 0; 406 goto next_attr; 407 408 end_enum: 409 410 if (!std5) 411 goto out; 412 413 if (!is_match && name) { 414 err = -ENOENT; 415 goto out; 416 } 417 418 if (std5->fa & FILE_ATTRIBUTE_READONLY) 419 mode &= ~0222; 420 421 if (!names) { 422 err = -EINVAL; 423 goto out; 424 } 425 426 if (names != le16_to_cpu(rec->hard_links)) { 427 /* Correct minor error on the fly. Do not mark inode as dirty. */ 428 ntfs_inode_warn(inode, "Correct links count -> %u.", names); 429 rec->hard_links = cpu_to_le16(names); 430 ni->mi.dirty = true; 431 } 432 433 set_nlink(inode, links); 434 435 if (S_ISDIR(mode)) { 436 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; 437 438 /* 439 * Dot and dot-dot should be included in count but was not 440 * included in enumeration. 441 * Usually a hard links to directories are disabled. 442 */ 443 inode->i_op = &ntfs_dir_inode_operations; 444 inode->i_fop = &ntfs_dir_operations; 445 ni->i_valid = 0; 446 } else if (S_ISLNK(mode)) { 447 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 448 inode->i_op = &ntfs_link_inode_operations; 449 inode->i_fop = NULL; 450 inode_nohighmem(inode); 451 } else if (S_ISREG(mode)) { 452 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 453 inode->i_op = &ntfs_file_inode_operations; 454 inode->i_fop = &ntfs_file_operations; 455 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 456 &ntfs_aops; 457 if (ino != MFT_REC_MFT) 458 init_rwsem(&ni->file.run_lock); 459 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || 460 S_ISSOCK(mode)) { 461 inode->i_op = &ntfs_special_inode_operations; 462 init_special_inode(inode, mode, inode->i_rdev); 463 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && 464 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { 465 /* Records in $Extend are not a files or general directories. */ 466 inode->i_op = &ntfs_file_inode_operations; 467 } else { 468 err = -EINVAL; 469 goto out; 470 } 471 472 if ((sbi->options->sys_immutable && 473 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 474 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 475 inode->i_flags |= S_IMMUTABLE; 476 } else { 477 inode->i_flags &= ~S_IMMUTABLE; 478 } 479 480 inode->i_mode = mode; 481 if (!(ni->ni_flags & NI_FLAG_EA)) { 482 /* If no xattr then no security (stored in xattr). */ 483 inode->i_flags |= S_NOSEC; 484 } 485 486 if (ino == MFT_REC_MFT && !sb->s_root) 487 sbi->mft.ni = NULL; 488 489 unlock_new_inode(inode); 490 491 return inode; 492 493 out: 494 if (ino == MFT_REC_MFT && !sb->s_root) 495 sbi->mft.ni = NULL; 496 497 iget_failed(inode); 498 return ERR_PTR(err); 499 } 500 501 /* 502 * ntfs_test_inode 503 * 504 * Return: 1 if match. 505 */ 506 static int ntfs_test_inode(struct inode *inode, void *data) 507 { 508 struct MFT_REF *ref = data; 509 510 return ino_get(ref) == inode->i_ino; 511 } 512 513 static int ntfs_set_inode(struct inode *inode, void *data) 514 { 515 const struct MFT_REF *ref = data; 516 517 inode->i_ino = ino_get(ref); 518 return 0; 519 } 520 521 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 522 const struct cpu_str *name) 523 { 524 struct inode *inode; 525 526 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 527 (void *)ref); 528 if (unlikely(!inode)) 529 return ERR_PTR(-ENOMEM); 530 531 /* If this is a freshly allocated inode, need to read it now. */ 532 if (inode->i_state & I_NEW) 533 inode = ntfs_read_mft(inode, name, ref); 534 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 535 /* 536 * Sequence number is not expected. 537 * Looks like inode was reused but caller uses the old reference 538 */ 539 iput(inode); 540 inode = ERR_PTR(-ESTALE); 541 } 542 543 if (IS_ERR(inode)) 544 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR); 545 546 return inode; 547 } 548 549 enum get_block_ctx { 550 GET_BLOCK_GENERAL = 0, 551 GET_BLOCK_WRITE_BEGIN = 1, 552 GET_BLOCK_DIRECT_IO_R = 2, 553 GET_BLOCK_DIRECT_IO_W = 3, 554 GET_BLOCK_BMAP = 4, 555 }; 556 557 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 558 struct buffer_head *bh, int create, 559 enum get_block_ctx ctx) 560 { 561 struct super_block *sb = inode->i_sb; 562 struct ntfs_sb_info *sbi = sb->s_fs_info; 563 struct ntfs_inode *ni = ntfs_i(inode); 564 struct folio *folio = bh->b_folio; 565 u8 cluster_bits = sbi->cluster_bits; 566 u32 block_size = sb->s_blocksize; 567 u64 bytes, lbo, valid; 568 u32 off; 569 int err; 570 CLST vcn, lcn, len; 571 bool new; 572 573 /* Clear previous state. */ 574 clear_buffer_new(bh); 575 clear_buffer_uptodate(bh); 576 577 if (is_resident(ni)) { 578 bh->b_blocknr = RESIDENT_LCN; 579 bh->b_size = block_size; 580 if (!folio) { 581 err = 0; 582 } else { 583 ni_lock(ni); 584 err = attr_data_read_resident(ni, &folio->page); 585 ni_unlock(ni); 586 587 if (!err) 588 set_buffer_uptodate(bh); 589 } 590 return err; 591 } 592 593 vcn = vbo >> cluster_bits; 594 off = vbo & sbi->cluster_mask; 595 new = false; 596 597 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL, 598 create && sbi->cluster_size > PAGE_SIZE); 599 if (err) 600 goto out; 601 602 if (!len) 603 return 0; 604 605 bytes = ((u64)len << cluster_bits) - off; 606 607 if (lcn == SPARSE_LCN) { 608 if (!create) { 609 if (bh->b_size > bytes) 610 bh->b_size = bytes; 611 return 0; 612 } 613 WARN_ON(1); 614 } 615 616 if (new) 617 set_buffer_new(bh); 618 619 lbo = ((u64)lcn << cluster_bits) + off; 620 621 set_buffer_mapped(bh); 622 bh->b_bdev = sb->s_bdev; 623 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 624 625 valid = ni->i_valid; 626 627 if (ctx == GET_BLOCK_DIRECT_IO_W) { 628 /* ntfs_direct_IO will update ni->i_valid. */ 629 if (vbo >= valid) 630 set_buffer_new(bh); 631 } else if (create) { 632 /* Normal write. */ 633 if (bytes > bh->b_size) 634 bytes = bh->b_size; 635 636 if (vbo >= valid) 637 set_buffer_new(bh); 638 639 if (vbo + bytes > valid) { 640 ni->i_valid = vbo + bytes; 641 mark_inode_dirty(inode); 642 } 643 } else if (vbo >= valid) { 644 /* Read out of valid data. */ 645 clear_buffer_mapped(bh); 646 } else if (vbo + bytes <= valid) { 647 /* Normal read. */ 648 } else if (vbo + block_size <= valid) { 649 /* Normal short read. */ 650 bytes = block_size; 651 } else { 652 /* 653 * Read across valid size: vbo < valid && valid < vbo + block_size 654 */ 655 bytes = block_size; 656 657 if (folio) { 658 u32 voff = valid - vbo; 659 660 bh->b_size = block_size; 661 off = vbo & (PAGE_SIZE - 1); 662 folio_set_bh(bh, folio, off); 663 664 err = bh_read(bh, 0); 665 if (err < 0) 666 goto out; 667 folio_zero_segment(folio, off + voff, off + block_size); 668 } 669 } 670 671 if (bh->b_size > bytes) 672 bh->b_size = bytes; 673 674 #ifndef __LP64__ 675 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 676 static_assert(sizeof(size_t) < sizeof(loff_t)); 677 if (bytes > 0x40000000u) 678 bh->b_size = 0x40000000u; 679 } 680 #endif 681 682 return 0; 683 684 out: 685 return err; 686 } 687 688 int ntfs_get_block(struct inode *inode, sector_t vbn, 689 struct buffer_head *bh_result, int create) 690 { 691 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 692 bh_result, create, GET_BLOCK_GENERAL); 693 } 694 695 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 696 struct buffer_head *bh_result, int create) 697 { 698 return ntfs_get_block_vbo(inode, 699 (u64)vsn << inode->i_sb->s_blocksize_bits, 700 bh_result, create, GET_BLOCK_BMAP); 701 } 702 703 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 704 { 705 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 706 } 707 708 static int ntfs_read_folio(struct file *file, struct folio *folio) 709 { 710 struct page *page = &folio->page; 711 int err; 712 struct address_space *mapping = page->mapping; 713 struct inode *inode = mapping->host; 714 struct ntfs_inode *ni = ntfs_i(inode); 715 716 if (is_resident(ni)) { 717 ni_lock(ni); 718 err = attr_data_read_resident(ni, page); 719 ni_unlock(ni); 720 if (err != E_NTFS_NONRESIDENT) { 721 unlock_page(page); 722 return err; 723 } 724 } 725 726 if (is_compressed(ni)) { 727 ni_lock(ni); 728 err = ni_readpage_cmpr(ni, page); 729 ni_unlock(ni); 730 return err; 731 } 732 733 /* Normal + sparse files. */ 734 return mpage_read_folio(folio, ntfs_get_block); 735 } 736 737 static void ntfs_readahead(struct readahead_control *rac) 738 { 739 struct address_space *mapping = rac->mapping; 740 struct inode *inode = mapping->host; 741 struct ntfs_inode *ni = ntfs_i(inode); 742 u64 valid; 743 loff_t pos; 744 745 if (is_resident(ni)) { 746 /* No readahead for resident. */ 747 return; 748 } 749 750 if (is_compressed(ni)) { 751 /* No readahead for compressed. */ 752 return; 753 } 754 755 valid = ni->i_valid; 756 pos = readahead_pos(rac); 757 758 if (valid < i_size_read(inode) && pos <= valid && 759 valid < pos + readahead_length(rac)) { 760 /* Range cross 'valid'. Read it page by page. */ 761 return; 762 } 763 764 mpage_readahead(rac, ntfs_get_block); 765 } 766 767 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 768 struct buffer_head *bh_result, int create) 769 { 770 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 771 bh_result, create, GET_BLOCK_DIRECT_IO_R); 772 } 773 774 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 775 struct buffer_head *bh_result, int create) 776 { 777 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 778 bh_result, create, GET_BLOCK_DIRECT_IO_W); 779 } 780 781 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 782 { 783 struct file *file = iocb->ki_filp; 784 struct address_space *mapping = file->f_mapping; 785 struct inode *inode = mapping->host; 786 struct ntfs_inode *ni = ntfs_i(inode); 787 loff_t vbo = iocb->ki_pos; 788 loff_t end; 789 int wr = iov_iter_rw(iter) & WRITE; 790 size_t iter_count = iov_iter_count(iter); 791 loff_t valid; 792 ssize_t ret; 793 794 if (is_resident(ni)) { 795 /* Switch to buffered write. */ 796 ret = 0; 797 goto out; 798 } 799 800 ret = blockdev_direct_IO(iocb, inode, iter, 801 wr ? ntfs_get_block_direct_IO_W : 802 ntfs_get_block_direct_IO_R); 803 804 if (ret > 0) 805 end = vbo + ret; 806 else if (wr && ret == -EIOCBQUEUED) 807 end = vbo + iter_count; 808 else 809 goto out; 810 811 valid = ni->i_valid; 812 if (wr) { 813 if (end > valid && !S_ISBLK(inode->i_mode)) { 814 ni->i_valid = end; 815 mark_inode_dirty(inode); 816 } 817 } else if (vbo < valid && valid < end) { 818 /* Fix page. */ 819 iov_iter_revert(iter, end - valid); 820 iov_iter_zero(end - valid, iter); 821 } 822 823 out: 824 return ret; 825 } 826 827 int ntfs_set_size(struct inode *inode, u64 new_size) 828 { 829 struct super_block *sb = inode->i_sb; 830 struct ntfs_sb_info *sbi = sb->s_fs_info; 831 struct ntfs_inode *ni = ntfs_i(inode); 832 int err; 833 834 /* Check for maximum file size. */ 835 if (is_sparsed(ni) || is_compressed(ni)) { 836 if (new_size > sbi->maxbytes_sparse) { 837 err = -EFBIG; 838 goto out; 839 } 840 } else if (new_size > sbi->maxbytes) { 841 err = -EFBIG; 842 goto out; 843 } 844 845 ni_lock(ni); 846 down_write(&ni->file.run_lock); 847 848 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 849 &ni->i_valid, true, NULL); 850 851 up_write(&ni->file.run_lock); 852 ni_unlock(ni); 853 854 mark_inode_dirty(inode); 855 856 out: 857 return err; 858 } 859 860 static int ntfs_resident_writepage(struct folio *folio, 861 struct writeback_control *wbc, void *data) 862 { 863 struct address_space *mapping = data; 864 struct inode *inode = mapping->host; 865 struct ntfs_inode *ni = ntfs_i(inode); 866 int ret; 867 868 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 869 return -EIO; 870 871 ni_lock(ni); 872 ret = attr_data_write_resident(ni, &folio->page); 873 ni_unlock(ni); 874 875 if (ret != E_NTFS_NONRESIDENT) 876 folio_unlock(folio); 877 mapping_set_error(mapping, ret); 878 return ret; 879 } 880 881 static int ntfs_writepages(struct address_space *mapping, 882 struct writeback_control *wbc) 883 { 884 struct inode *inode = mapping->host; 885 886 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 887 return -EIO; 888 889 if (is_resident(ntfs_i(inode))) 890 return write_cache_pages(mapping, wbc, ntfs_resident_writepage, 891 mapping); 892 return mpage_writepages(mapping, wbc, ntfs_get_block); 893 } 894 895 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 896 struct buffer_head *bh_result, int create) 897 { 898 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 899 bh_result, create, GET_BLOCK_WRITE_BEGIN); 900 } 901 902 int ntfs_write_begin(struct file *file, struct address_space *mapping, 903 loff_t pos, u32 len, struct page **pagep, void **fsdata) 904 { 905 int err; 906 struct inode *inode = mapping->host; 907 struct ntfs_inode *ni = ntfs_i(inode); 908 909 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 910 return -EIO; 911 912 *pagep = NULL; 913 if (is_resident(ni)) { 914 struct page *page = 915 grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT); 916 917 if (!page) { 918 err = -ENOMEM; 919 goto out; 920 } 921 922 ni_lock(ni); 923 err = attr_data_read_resident(ni, page); 924 ni_unlock(ni); 925 926 if (!err) { 927 *pagep = page; 928 goto out; 929 } 930 unlock_page(page); 931 put_page(page); 932 933 if (err != E_NTFS_NONRESIDENT) 934 goto out; 935 } 936 937 err = block_write_begin(mapping, pos, len, pagep, 938 ntfs_get_block_write_begin); 939 940 out: 941 return err; 942 } 943 944 /* 945 * ntfs_write_end - Address_space_operations::write_end. 946 */ 947 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, 948 u32 len, u32 copied, struct page *page, void *fsdata) 949 { 950 struct inode *inode = mapping->host; 951 struct ntfs_inode *ni = ntfs_i(inode); 952 u64 valid = ni->i_valid; 953 bool dirty = false; 954 int err; 955 956 if (is_resident(ni)) { 957 ni_lock(ni); 958 err = attr_data_write_resident(ni, page); 959 ni_unlock(ni); 960 if (!err) { 961 dirty = true; 962 /* Clear any buffers in page. */ 963 if (page_has_buffers(page)) { 964 struct buffer_head *head, *bh; 965 966 bh = head = page_buffers(page); 967 do { 968 clear_buffer_dirty(bh); 969 clear_buffer_mapped(bh); 970 set_buffer_uptodate(bh); 971 } while (head != (bh = bh->b_this_page)); 972 } 973 SetPageUptodate(page); 974 err = copied; 975 } 976 unlock_page(page); 977 put_page(page); 978 } else { 979 err = generic_write_end(file, mapping, pos, len, copied, page, 980 fsdata); 981 } 982 983 if (err >= 0) { 984 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 985 inode->i_mtime = inode_set_ctime_current(inode); 986 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 987 dirty = true; 988 } 989 990 if (valid != ni->i_valid) { 991 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 992 dirty = true; 993 } 994 995 if (pos + err > inode->i_size) { 996 i_size_write(inode, pos + err); 997 dirty = true; 998 } 999 1000 if (dirty) 1001 mark_inode_dirty(inode); 1002 } 1003 1004 return err; 1005 } 1006 1007 int reset_log_file(struct inode *inode) 1008 { 1009 int err; 1010 loff_t pos = 0; 1011 u32 log_size = inode->i_size; 1012 struct address_space *mapping = inode->i_mapping; 1013 1014 for (;;) { 1015 u32 len; 1016 void *kaddr; 1017 struct page *page; 1018 1019 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 1020 1021 err = block_write_begin(mapping, pos, len, &page, 1022 ntfs_get_block_write_begin); 1023 if (err) 1024 goto out; 1025 1026 kaddr = kmap_atomic(page); 1027 memset(kaddr, -1, len); 1028 kunmap_atomic(kaddr); 1029 flush_dcache_page(page); 1030 1031 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 1032 if (err < 0) 1033 goto out; 1034 pos += len; 1035 1036 if (pos >= log_size) 1037 break; 1038 balance_dirty_pages_ratelimited(mapping); 1039 } 1040 out: 1041 mark_inode_dirty_sync(inode); 1042 1043 return err; 1044 } 1045 1046 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1047 { 1048 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1049 } 1050 1051 int ntfs_sync_inode(struct inode *inode) 1052 { 1053 return _ni_write_inode(inode, 1); 1054 } 1055 1056 /* 1057 * writeback_inode - Helper function for ntfs_flush_inodes(). 1058 * 1059 * This writes both the inode and the file data blocks, waiting 1060 * for in flight data blocks before the start of the call. It 1061 * does not wait for any io started during the call. 1062 */ 1063 static int writeback_inode(struct inode *inode) 1064 { 1065 int ret = sync_inode_metadata(inode, 0); 1066 1067 if (!ret) 1068 ret = filemap_fdatawrite(inode->i_mapping); 1069 return ret; 1070 } 1071 1072 /* 1073 * ntfs_flush_inodes 1074 * 1075 * Write data and metadata corresponding to i1 and i2. The io is 1076 * started but we do not wait for any of it to finish. 1077 * 1078 * filemap_flush() is used for the block device, so if there is a dirty 1079 * page for a block already in flight, we will not wait and start the 1080 * io over again. 1081 */ 1082 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1083 struct inode *i2) 1084 { 1085 int ret = 0; 1086 1087 if (i1) 1088 ret = writeback_inode(i1); 1089 if (!ret && i2) 1090 ret = writeback_inode(i2); 1091 if (!ret) 1092 ret = sync_blockdev_nowait(sb->s_bdev); 1093 return ret; 1094 } 1095 1096 int inode_write_data(struct inode *inode, const void *data, size_t bytes) 1097 { 1098 pgoff_t idx; 1099 1100 /* Write non resident data. */ 1101 for (idx = 0; bytes; idx++) { 1102 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1103 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1104 1105 if (IS_ERR(page)) 1106 return PTR_ERR(page); 1107 1108 lock_page(page); 1109 WARN_ON(!PageUptodate(page)); 1110 ClearPageUptodate(page); 1111 1112 memcpy(page_address(page), data, op); 1113 1114 flush_dcache_page(page); 1115 SetPageUptodate(page); 1116 unlock_page(page); 1117 1118 ntfs_unmap_page(page); 1119 1120 bytes -= op; 1121 data = Add2Ptr(data, PAGE_SIZE); 1122 } 1123 return 0; 1124 } 1125 1126 /* 1127 * ntfs_reparse_bytes 1128 * 1129 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1130 * for unicode string of @uni_len length. 1131 */ 1132 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1133 { 1134 /* Header + unicode string + decorated unicode string. */ 1135 return sizeof(short) * (2 * uni_len + 4) + 1136 offsetof(struct REPARSE_DATA_BUFFER, 1137 SymbolicLinkReparseBuffer.PathBuffer); 1138 } 1139 1140 static struct REPARSE_DATA_BUFFER * 1141 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1142 u32 size, u16 *nsize) 1143 { 1144 int i, err; 1145 struct REPARSE_DATA_BUFFER *rp; 1146 __le16 *rp_name; 1147 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1148 1149 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1150 if (!rp) 1151 return ERR_PTR(-ENOMEM); 1152 1153 rs = &rp->SymbolicLinkReparseBuffer; 1154 rp_name = rs->PathBuffer; 1155 1156 /* Convert link name to UTF-16. */ 1157 err = ntfs_nls_to_utf16(sbi, symname, size, 1158 (struct cpu_str *)(rp_name - 1), 2 * size, 1159 UTF16_LITTLE_ENDIAN); 1160 if (err < 0) 1161 goto out; 1162 1163 /* err = the length of unicode name of symlink. */ 1164 *nsize = ntfs_reparse_bytes(err); 1165 1166 if (*nsize > sbi->reparse.max_size) { 1167 err = -EFBIG; 1168 goto out; 1169 } 1170 1171 /* Translate Linux '/' into Windows '\'. */ 1172 for (i = 0; i < err; i++) { 1173 if (rp_name[i] == cpu_to_le16('/')) 1174 rp_name[i] = cpu_to_le16('\\'); 1175 } 1176 1177 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1178 rp->ReparseDataLength = 1179 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1180 SymbolicLinkReparseBuffer)); 1181 1182 /* PrintName + SubstituteName. */ 1183 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1184 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1185 rs->PrintNameLength = rs->SubstituteNameOffset; 1186 1187 /* 1188 * TODO: Use relative path if possible to allow Windows to 1189 * parse this path. 1190 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1191 */ 1192 rs->Flags = 0; 1193 1194 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1195 1196 /* Decorate SubstituteName. */ 1197 rp_name += err; 1198 rp_name[0] = cpu_to_le16('\\'); 1199 rp_name[1] = cpu_to_le16('?'); 1200 rp_name[2] = cpu_to_le16('?'); 1201 rp_name[3] = cpu_to_le16('\\'); 1202 1203 return rp; 1204 out: 1205 kfree(rp); 1206 return ERR_PTR(err); 1207 } 1208 1209 /* 1210 * ntfs_create_inode 1211 * 1212 * Helper function for: 1213 * - ntfs_create 1214 * - ntfs_mknod 1215 * - ntfs_symlink 1216 * - ntfs_mkdir 1217 * - ntfs_atomic_open 1218 * 1219 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked 1220 */ 1221 struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, 1222 struct dentry *dentry, 1223 const struct cpu_str *uni, umode_t mode, 1224 dev_t dev, const char *symname, u32 size, 1225 struct ntfs_fnd *fnd) 1226 { 1227 int err; 1228 struct super_block *sb = dir->i_sb; 1229 struct ntfs_sb_info *sbi = sb->s_fs_info; 1230 const struct qstr *name = &dentry->d_name; 1231 CLST ino = 0; 1232 struct ntfs_inode *dir_ni = ntfs_i(dir); 1233 struct ntfs_inode *ni = NULL; 1234 struct inode *inode = NULL; 1235 struct ATTRIB *attr; 1236 struct ATTR_STD_INFO5 *std5; 1237 struct ATTR_FILE_NAME *fname; 1238 struct MFT_REC *rec; 1239 u32 asize, dsize, sd_size; 1240 enum FILE_ATTRIBUTE fa; 1241 __le32 security_id = SECURITY_ID_INVALID; 1242 CLST vcn; 1243 const void *sd; 1244 u16 t16, nsize = 0, aid = 0; 1245 struct INDEX_ROOT *root, *dir_root; 1246 struct NTFS_DE *e, *new_de = NULL; 1247 struct REPARSE_DATA_BUFFER *rp = NULL; 1248 bool rp_inserted = false; 1249 1250 if (!fnd) 1251 ni_lock_dir(dir_ni); 1252 1253 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1254 if (!dir_root) { 1255 err = -EINVAL; 1256 goto out1; 1257 } 1258 1259 if (S_ISDIR(mode)) { 1260 /* Use parent's directory attributes. */ 1261 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1262 FILE_ATTRIBUTE_ARCHIVE; 1263 /* 1264 * By default child directory inherits parent attributes. 1265 * Root directory is hidden + system. 1266 * Make an exception for children in root. 1267 */ 1268 if (dir->i_ino == MFT_REC_ROOT) 1269 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1270 } else if (S_ISLNK(mode)) { 1271 /* It is good idea that link should be the same type (file/dir) as target */ 1272 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1273 1274 /* 1275 * Linux: there are dir/file/symlink and so on. 1276 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1277 * It is good idea to create: 1278 * dir + reparse if 'symname' points to directory 1279 * or 1280 * file + reparse if 'symname' points to file 1281 * Unfortunately kern_path hangs if symname contains 'dir'. 1282 */ 1283 1284 /* 1285 * struct path path; 1286 * 1287 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1288 * struct inode *target = d_inode(path.dentry); 1289 * 1290 * if (S_ISDIR(target->i_mode)) 1291 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1292 * // if ( target->i_sb == sb ){ 1293 * // use relative path? 1294 * // } 1295 * path_put(&path); 1296 * } 1297 */ 1298 } else if (S_ISREG(mode)) { 1299 if (sbi->options->sparse) { 1300 /* Sparsed regular file, cause option 'sparse'. */ 1301 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1302 FILE_ATTRIBUTE_ARCHIVE; 1303 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1304 /* Compressed regular file, if parent is compressed. */ 1305 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1306 } else { 1307 /* Regular file, default attributes. */ 1308 fa = FILE_ATTRIBUTE_ARCHIVE; 1309 } 1310 } else { 1311 fa = FILE_ATTRIBUTE_ARCHIVE; 1312 } 1313 1314 /* If option "hide_dot_files" then set hidden attribute for dot files. */ 1315 if (sbi->options->hide_dot_files && name->name[0] == '.') 1316 fa |= FILE_ATTRIBUTE_HIDDEN; 1317 1318 if (!(mode & 0222)) 1319 fa |= FILE_ATTRIBUTE_READONLY; 1320 1321 /* Allocate PATH_MAX bytes. */ 1322 new_de = __getname(); 1323 if (!new_de) { 1324 err = -ENOMEM; 1325 goto out1; 1326 } 1327 1328 if (unlikely(ntfs3_forced_shutdown(sb))) { 1329 err = -EIO; 1330 goto out2; 1331 } 1332 1333 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1334 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1335 1336 /* Step 1: allocate and fill new mft record. */ 1337 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1338 if (err) 1339 goto out2; 1340 1341 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); 1342 if (IS_ERR(ni)) { 1343 err = PTR_ERR(ni); 1344 ni = NULL; 1345 goto out3; 1346 } 1347 inode = &ni->vfs_inode; 1348 inode_init_owner(idmap, inode, dir, mode); 1349 mode = inode->i_mode; 1350 1351 ni->i_crtime = current_time(inode); 1352 1353 rec = ni->mi.mrec; 1354 rec->hard_links = cpu_to_le16(1); 1355 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1356 1357 /* Get default security id. */ 1358 sd = s_default_security; 1359 sd_size = sizeof(s_default_security); 1360 1361 if (is_ntfs3(sbi)) { 1362 security_id = dir_ni->std_security_id; 1363 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1364 security_id = sbi->security.def_security_id; 1365 1366 if (security_id == SECURITY_ID_INVALID && 1367 !ntfs_insert_security(sbi, sd, sd_size, 1368 &security_id, NULL)) 1369 sbi->security.def_security_id = security_id; 1370 } 1371 } 1372 1373 /* Insert standard info. */ 1374 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1375 1376 if (security_id == SECURITY_ID_INVALID) { 1377 dsize = sizeof(struct ATTR_STD_INFO); 1378 } else { 1379 dsize = sizeof(struct ATTR_STD_INFO5); 1380 std5->security_id = security_id; 1381 ni->std_security_id = security_id; 1382 } 1383 asize = SIZEOF_RESIDENT + dsize; 1384 1385 attr->type = ATTR_STD; 1386 attr->size = cpu_to_le32(asize); 1387 attr->id = cpu_to_le16(aid++); 1388 attr->res.data_off = SIZEOF_RESIDENT_LE; 1389 attr->res.data_size = cpu_to_le32(dsize); 1390 1391 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1392 kernel2nt(&ni->i_crtime); 1393 1394 std5->fa = ni->std_fa = fa; 1395 1396 attr = Add2Ptr(attr, asize); 1397 1398 /* Insert file name. */ 1399 err = fill_name_de(sbi, new_de, name, uni); 1400 if (err) 1401 goto out4; 1402 1403 mi_get_ref(&ni->mi, &new_de->ref); 1404 1405 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1406 1407 if (sbi->options->windows_names && 1408 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) { 1409 err = -EINVAL; 1410 goto out4; 1411 } 1412 1413 mi_get_ref(&dir_ni->mi, &fname->home); 1414 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1415 fname->dup.a_time = std5->cr_time; 1416 fname->dup.alloc_size = fname->dup.data_size = 0; 1417 fname->dup.fa = std5->fa; 1418 fname->dup.ea_size = fname->dup.reparse = 0; 1419 1420 dsize = le16_to_cpu(new_de->key_size); 1421 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1422 1423 attr->type = ATTR_NAME; 1424 attr->size = cpu_to_le32(asize); 1425 attr->res.data_off = SIZEOF_RESIDENT_LE; 1426 attr->res.flags = RESIDENT_FLAG_INDEXED; 1427 attr->id = cpu_to_le16(aid++); 1428 attr->res.data_size = cpu_to_le32(dsize); 1429 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1430 1431 attr = Add2Ptr(attr, asize); 1432 1433 if (security_id == SECURITY_ID_INVALID) { 1434 /* Insert security attribute. */ 1435 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1436 1437 attr->type = ATTR_SECURE; 1438 attr->size = cpu_to_le32(asize); 1439 attr->id = cpu_to_le16(aid++); 1440 attr->res.data_off = SIZEOF_RESIDENT_LE; 1441 attr->res.data_size = cpu_to_le32(sd_size); 1442 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1443 1444 attr = Add2Ptr(attr, asize); 1445 } 1446 1447 attr->id = cpu_to_le16(aid++); 1448 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1449 /* 1450 * Regular directory or symlink to directory. 1451 * Create root attribute. 1452 */ 1453 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1454 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1455 1456 attr->type = ATTR_ROOT; 1457 attr->size = cpu_to_le32(asize); 1458 1459 attr->name_len = ARRAY_SIZE(I30_NAME); 1460 attr->name_off = SIZEOF_RESIDENT_LE; 1461 attr->res.data_off = 1462 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1463 attr->res.data_size = cpu_to_le32(dsize); 1464 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1465 sizeof(I30_NAME)); 1466 1467 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1468 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1469 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); 1470 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1471 sizeof(struct NTFS_DE)); 1472 root->ihdr.total = root->ihdr.used; 1473 1474 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1475 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1476 e->flags = NTFS_IE_LAST; 1477 } else if (S_ISLNK(mode)) { 1478 /* 1479 * Symlink to file. 1480 * Create empty resident data attribute. 1481 */ 1482 asize = SIZEOF_RESIDENT; 1483 1484 /* Insert empty ATTR_DATA */ 1485 attr->type = ATTR_DATA; 1486 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1487 attr->name_off = SIZEOF_RESIDENT_LE; 1488 attr->res.data_off = SIZEOF_RESIDENT_LE; 1489 } else if (S_ISREG(mode)) { 1490 /* 1491 * Regular file. Create empty non resident data attribute. 1492 */ 1493 attr->type = ATTR_DATA; 1494 attr->non_res = 1; 1495 attr->nres.evcn = cpu_to_le64(-1ll); 1496 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1497 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1498 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1499 attr->flags = ATTR_FLAG_SPARSED; 1500 asize = SIZEOF_NONRESIDENT_EX + 8; 1501 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1502 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1503 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1504 attr->flags = ATTR_FLAG_COMPRESSED; 1505 attr->nres.c_unit = NTFS_LZNT_CUNIT; 1506 asize = SIZEOF_NONRESIDENT_EX + 8; 1507 } else { 1508 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1509 attr->name_off = SIZEOF_NONRESIDENT_LE; 1510 asize = SIZEOF_NONRESIDENT + 8; 1511 } 1512 attr->nres.run_off = attr->name_off; 1513 } else { 1514 /* 1515 * Node. Create empty resident data attribute. 1516 */ 1517 attr->type = ATTR_DATA; 1518 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1519 attr->name_off = SIZEOF_RESIDENT_LE; 1520 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1521 attr->flags = ATTR_FLAG_SPARSED; 1522 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1523 attr->flags = ATTR_FLAG_COMPRESSED; 1524 attr->res.data_off = SIZEOF_RESIDENT_LE; 1525 asize = SIZEOF_RESIDENT; 1526 ni->ni_flags |= NI_FLAG_RESIDENT; 1527 } 1528 1529 if (S_ISDIR(mode)) { 1530 ni->ni_flags |= NI_FLAG_DIR; 1531 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1532 if (err) 1533 goto out4; 1534 } else if (S_ISLNK(mode)) { 1535 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1536 1537 if (IS_ERR(rp)) { 1538 err = PTR_ERR(rp); 1539 rp = NULL; 1540 goto out4; 1541 } 1542 1543 /* 1544 * Insert ATTR_REPARSE. 1545 */ 1546 attr = Add2Ptr(attr, asize); 1547 attr->type = ATTR_REPARSE; 1548 attr->id = cpu_to_le16(aid++); 1549 1550 /* Resident or non resident? */ 1551 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1552 t16 = PtrOffset(rec, attr); 1553 1554 /* 1555 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1556 * It is good idea to keep extened attributes resident. 1557 */ 1558 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1559 CLST alen; 1560 CLST clst = bytes_to_cluster(sbi, nsize); 1561 1562 /* Bytes per runs. */ 1563 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1564 1565 attr->non_res = 1; 1566 attr->nres.evcn = cpu_to_le64(clst - 1); 1567 attr->name_off = SIZEOF_NONRESIDENT_LE; 1568 attr->nres.run_off = attr->name_off; 1569 attr->nres.data_size = cpu_to_le64(nsize); 1570 attr->nres.valid_size = attr->nres.data_size; 1571 attr->nres.alloc_size = 1572 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1573 1574 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1575 clst, NULL, ALLOCATE_DEF, 1576 &alen, 0, NULL, NULL); 1577 if (err) 1578 goto out5; 1579 1580 err = run_pack(&ni->file.run, 0, clst, 1581 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1582 &vcn); 1583 if (err < 0) 1584 goto out5; 1585 1586 if (vcn != clst) { 1587 err = -EINVAL; 1588 goto out5; 1589 } 1590 1591 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1592 /* Write non resident data. */ 1593 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, 1594 nsize, 0); 1595 if (err) 1596 goto out5; 1597 } else { 1598 attr->res.data_off = SIZEOF_RESIDENT_LE; 1599 attr->res.data_size = cpu_to_le32(nsize); 1600 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1601 } 1602 /* Size of symlink equals the length of input string. */ 1603 inode->i_size = size; 1604 1605 attr->size = cpu_to_le32(asize); 1606 1607 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1608 &new_de->ref); 1609 if (err) 1610 goto out5; 1611 1612 rp_inserted = true; 1613 } 1614 1615 attr = Add2Ptr(attr, asize); 1616 attr->type = ATTR_END; 1617 1618 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1619 rec->next_attr_id = cpu_to_le16(aid); 1620 1621 inode->i_generation = le16_to_cpu(rec->seq); 1622 1623 if (S_ISDIR(mode)) { 1624 inode->i_op = &ntfs_dir_inode_operations; 1625 inode->i_fop = &ntfs_dir_operations; 1626 } else if (S_ISLNK(mode)) { 1627 inode->i_op = &ntfs_link_inode_operations; 1628 inode->i_fop = NULL; 1629 inode->i_mapping->a_ops = &ntfs_aops; 1630 inode->i_size = size; 1631 inode_nohighmem(inode); 1632 } else if (S_ISREG(mode)) { 1633 inode->i_op = &ntfs_file_inode_operations; 1634 inode->i_fop = &ntfs_file_operations; 1635 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 1636 &ntfs_aops; 1637 init_rwsem(&ni->file.run_lock); 1638 } else { 1639 inode->i_op = &ntfs_special_inode_operations; 1640 init_special_inode(inode, mode, dev); 1641 } 1642 1643 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1644 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1645 err = ntfs_init_acl(idmap, inode, dir); 1646 if (err) 1647 goto out5; 1648 } else 1649 #endif 1650 { 1651 inode->i_flags |= S_NOSEC; 1652 } 1653 1654 /* 1655 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. 1656 * The packed size of extended attribute is stored in direntry too. 1657 * 'fname' here points to inside new_de. 1658 */ 1659 err = ntfs_save_wsl_perm(inode, &fname->dup.ea_size); 1660 if (err) 1661 goto out6; 1662 1663 /* 1664 * update ea_size in file_name attribute too. 1665 * Use ni_find_attr cause layout of MFT record may be changed 1666 * in ntfs_init_acl and ntfs_save_wsl_perm. 1667 */ 1668 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL); 1669 if (attr) { 1670 struct ATTR_FILE_NAME *fn; 1671 1672 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1673 if (fn) 1674 fn->dup.ea_size = fname->dup.ea_size; 1675 } 1676 1677 /* We do not need to update parent directory later */ 1678 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; 1679 1680 /* Step 2: Add new name in index. */ 1681 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1682 if (err) 1683 goto out6; 1684 1685 /* 1686 * Call 'd_instantiate' after inode->i_op is set 1687 * but before finish_open. 1688 */ 1689 d_instantiate(dentry, inode); 1690 1691 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ 1692 inode->i_atime = inode->i_mtime = 1693 inode_set_ctime_to_ts(inode, ni->i_crtime); 1694 dir->i_mtime = inode_set_ctime_to_ts(dir, ni->i_crtime); 1695 1696 mark_inode_dirty(dir); 1697 mark_inode_dirty(inode); 1698 1699 /* Normal exit. */ 1700 goto out2; 1701 1702 out6: 1703 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL); 1704 if (attr && attr->non_res) { 1705 /* Delete ATTR_EA, if non-resident. */ 1706 struct runs_tree run; 1707 run_init(&run); 1708 attr_set_size(ni, ATTR_EA, NULL, 0, &run, 0, NULL, false, NULL); 1709 run_close(&run); 1710 } 1711 1712 if (rp_inserted) 1713 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1714 1715 out5: 1716 if (!S_ISDIR(mode)) 1717 run_deallocate(sbi, &ni->file.run, false); 1718 1719 out4: 1720 clear_rec_inuse(rec); 1721 clear_nlink(inode); 1722 ni->mi.dirty = false; 1723 discard_new_inode(inode); 1724 out3: 1725 ntfs_mark_rec_free(sbi, ino, false); 1726 1727 out2: 1728 __putname(new_de); 1729 kfree(rp); 1730 1731 out1: 1732 if (!fnd) 1733 ni_unlock(dir_ni); 1734 1735 if (err) 1736 return ERR_PTR(err); 1737 1738 unlock_new_inode(inode); 1739 1740 return inode; 1741 } 1742 1743 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1744 { 1745 int err; 1746 struct ntfs_inode *ni = ntfs_i(inode); 1747 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1748 struct NTFS_DE *de; 1749 1750 /* Allocate PATH_MAX bytes. */ 1751 de = __getname(); 1752 if (!de) 1753 return -ENOMEM; 1754 1755 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1756 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1757 1758 /* Construct 'de'. */ 1759 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1760 if (err) 1761 goto out; 1762 1763 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1764 out: 1765 __putname(de); 1766 return err; 1767 } 1768 1769 /* 1770 * ntfs_unlink_inode 1771 * 1772 * inode_operations::unlink 1773 * inode_operations::rmdir 1774 */ 1775 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1776 { 1777 int err; 1778 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1779 struct inode *inode = d_inode(dentry); 1780 struct ntfs_inode *ni = ntfs_i(inode); 1781 struct ntfs_inode *dir_ni = ntfs_i(dir); 1782 struct NTFS_DE *de, *de2 = NULL; 1783 int undo_remove; 1784 1785 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1786 return -EINVAL; 1787 1788 /* Allocate PATH_MAX bytes. */ 1789 de = __getname(); 1790 if (!de) 1791 return -ENOMEM; 1792 1793 ni_lock(ni); 1794 1795 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1796 err = -ENOTEMPTY; 1797 goto out; 1798 } 1799 1800 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1801 if (err < 0) 1802 goto out; 1803 1804 undo_remove = 0; 1805 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1806 1807 if (!err) { 1808 drop_nlink(inode); 1809 dir->i_mtime = inode_set_ctime_current(dir); 1810 mark_inode_dirty(dir); 1811 inode_set_ctime_to_ts(inode, inode_get_ctime(dir)); 1812 if (inode->i_nlink) 1813 mark_inode_dirty(inode); 1814 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1815 _ntfs_bad_inode(inode); 1816 } else { 1817 if (ni_is_dirty(dir)) 1818 mark_inode_dirty(dir); 1819 if (ni_is_dirty(inode)) 1820 mark_inode_dirty(inode); 1821 } 1822 1823 out: 1824 ni_unlock(ni); 1825 __putname(de); 1826 return err; 1827 } 1828 1829 void ntfs_evict_inode(struct inode *inode) 1830 { 1831 truncate_inode_pages_final(&inode->i_data); 1832 1833 invalidate_inode_buffers(inode); 1834 clear_inode(inode); 1835 1836 ni_clear(ntfs_i(inode)); 1837 } 1838 1839 /* 1840 * ntfs_translate_junction 1841 * 1842 * Translate a Windows junction target to the Linux equivalent. 1843 * On junctions, targets are always absolute (they include the drive 1844 * letter). We have no way of knowing if the target is for the current 1845 * mounted device or not so we just assume it is. 1846 */ 1847 static int ntfs_translate_junction(const struct super_block *sb, 1848 const struct dentry *link_de, char *target, 1849 int target_len, int target_max) 1850 { 1851 int tl_len, err = target_len; 1852 char *link_path_buffer = NULL, *link_path; 1853 char *translated = NULL; 1854 char *target_start; 1855 int copy_len; 1856 1857 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); 1858 if (!link_path_buffer) { 1859 err = -ENOMEM; 1860 goto out; 1861 } 1862 /* Get link path, relative to mount point */ 1863 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); 1864 if (IS_ERR(link_path)) { 1865 ntfs_err(sb, "Error getting link path"); 1866 err = -EINVAL; 1867 goto out; 1868 } 1869 1870 translated = kmalloc(PATH_MAX, GFP_NOFS); 1871 if (!translated) { 1872 err = -ENOMEM; 1873 goto out; 1874 } 1875 1876 /* Make translated path a relative path to mount point */ 1877 strcpy(translated, "./"); 1878 ++link_path; /* Skip leading / */ 1879 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) { 1880 if (*link_path == '/') { 1881 if (PATH_MAX - tl_len < sizeof("../")) { 1882 ntfs_err(sb, 1883 "Link path %s has too many components", 1884 link_path); 1885 err = -EINVAL; 1886 goto out; 1887 } 1888 strcpy(translated + tl_len, "../"); 1889 tl_len += sizeof("../") - 1; 1890 } 1891 } 1892 1893 /* Skip drive letter */ 1894 target_start = target; 1895 while (*target_start && *target_start != ':') 1896 ++target_start; 1897 1898 if (!*target_start) { 1899 ntfs_err(sb, "Link target (%s) missing drive separator", 1900 target); 1901 err = -EINVAL; 1902 goto out; 1903 } 1904 1905 /* Skip drive separator and leading /, if exists */ 1906 target_start += 1 + (target_start[1] == '/'); 1907 copy_len = target_len - (target_start - target); 1908 1909 if (PATH_MAX - tl_len <= copy_len) { 1910 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)", 1911 target_start, PATH_MAX - tl_len, copy_len); 1912 err = -EINVAL; 1913 goto out; 1914 } 1915 1916 /* translated path has a trailing / and target_start does not */ 1917 strcpy(translated + tl_len, target_start); 1918 tl_len += copy_len; 1919 if (target_max <= tl_len) { 1920 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)", 1921 translated, target_max, tl_len); 1922 err = -EINVAL; 1923 goto out; 1924 } 1925 strcpy(target, translated); 1926 err = tl_len; 1927 1928 out: 1929 kfree(link_path_buffer); 1930 kfree(translated); 1931 return err; 1932 } 1933 1934 static noinline int ntfs_readlink_hlp(const struct dentry *link_de, 1935 struct inode *inode, char *buffer, 1936 int buflen) 1937 { 1938 int i, err = -EINVAL; 1939 struct ntfs_inode *ni = ntfs_i(inode); 1940 struct super_block *sb = inode->i_sb; 1941 struct ntfs_sb_info *sbi = sb->s_fs_info; 1942 u64 size; 1943 u16 ulen = 0; 1944 void *to_free = NULL; 1945 struct REPARSE_DATA_BUFFER *rp; 1946 const __le16 *uname; 1947 struct ATTRIB *attr; 1948 1949 /* Reparse data present. Try to parse it. */ 1950 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1951 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1952 1953 *buffer = 0; 1954 1955 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1956 if (!attr) 1957 goto out; 1958 1959 if (!attr->non_res) { 1960 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1961 if (!rp) 1962 goto out; 1963 size = le32_to_cpu(attr->res.data_size); 1964 } else { 1965 size = le64_to_cpu(attr->nres.data_size); 1966 rp = NULL; 1967 } 1968 1969 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1970 goto out; 1971 1972 if (!rp) { 1973 rp = kmalloc(size, GFP_NOFS); 1974 if (!rp) { 1975 err = -ENOMEM; 1976 goto out; 1977 } 1978 to_free = rp; 1979 /* Read into temporal buffer. */ 1980 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1981 if (err) 1982 goto out; 1983 } 1984 1985 /* Microsoft Tag. */ 1986 switch (rp->ReparseTag) { 1987 case IO_REPARSE_TAG_MOUNT_POINT: 1988 /* Mount points and junctions. */ 1989 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1990 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1991 MountPointReparseBuffer.PathBuffer)) 1992 goto out; 1993 uname = Add2Ptr(rp, 1994 offsetof(struct REPARSE_DATA_BUFFER, 1995 MountPointReparseBuffer.PathBuffer) + 1996 le16_to_cpu(rp->MountPointReparseBuffer 1997 .PrintNameOffset)); 1998 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1999 break; 2000 2001 case IO_REPARSE_TAG_SYMLINK: 2002 /* FolderSymbolicLink */ 2003 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 2004 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 2005 SymbolicLinkReparseBuffer.PathBuffer)) 2006 goto out; 2007 uname = Add2Ptr( 2008 rp, offsetof(struct REPARSE_DATA_BUFFER, 2009 SymbolicLinkReparseBuffer.PathBuffer) + 2010 le16_to_cpu(rp->SymbolicLinkReparseBuffer 2011 .PrintNameOffset)); 2012 ulen = le16_to_cpu( 2013 rp->SymbolicLinkReparseBuffer.PrintNameLength); 2014 break; 2015 2016 case IO_REPARSE_TAG_CLOUD: 2017 case IO_REPARSE_TAG_CLOUD_1: 2018 case IO_REPARSE_TAG_CLOUD_2: 2019 case IO_REPARSE_TAG_CLOUD_3: 2020 case IO_REPARSE_TAG_CLOUD_4: 2021 case IO_REPARSE_TAG_CLOUD_5: 2022 case IO_REPARSE_TAG_CLOUD_6: 2023 case IO_REPARSE_TAG_CLOUD_7: 2024 case IO_REPARSE_TAG_CLOUD_8: 2025 case IO_REPARSE_TAG_CLOUD_9: 2026 case IO_REPARSE_TAG_CLOUD_A: 2027 case IO_REPARSE_TAG_CLOUD_B: 2028 case IO_REPARSE_TAG_CLOUD_C: 2029 case IO_REPARSE_TAG_CLOUD_D: 2030 case IO_REPARSE_TAG_CLOUD_E: 2031 case IO_REPARSE_TAG_CLOUD_F: 2032 err = sizeof("OneDrive") - 1; 2033 if (err > buflen) 2034 err = buflen; 2035 memcpy(buffer, "OneDrive", err); 2036 goto out; 2037 2038 default: 2039 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 2040 /* Unknown Microsoft Tag. */ 2041 goto out; 2042 } 2043 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 2044 size <= sizeof(struct REPARSE_POINT)) { 2045 goto out; 2046 } 2047 2048 /* Users tag. */ 2049 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 2050 ulen = le16_to_cpu(rp->ReparseDataLength) - 2051 sizeof(struct REPARSE_POINT); 2052 } 2053 2054 /* Convert nlen from bytes to UNICODE chars. */ 2055 ulen >>= 1; 2056 2057 /* Check that name is available. */ 2058 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 2059 goto out; 2060 2061 /* If name is already zero terminated then truncate it now. */ 2062 if (!uname[ulen - 1]) 2063 ulen -= 1; 2064 2065 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 2066 2067 if (err < 0) 2068 goto out; 2069 2070 /* Translate Windows '\' into Linux '/'. */ 2071 for (i = 0; i < err; i++) { 2072 if (buffer[i] == '\\') 2073 buffer[i] = '/'; 2074 } 2075 2076 /* Always set last zero. */ 2077 buffer[err] = 0; 2078 2079 /* If this is a junction, translate the link target. */ 2080 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) 2081 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen); 2082 2083 out: 2084 kfree(to_free); 2085 return err; 2086 } 2087 2088 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 2089 struct delayed_call *done) 2090 { 2091 int err; 2092 char *ret; 2093 2094 if (!de) 2095 return ERR_PTR(-ECHILD); 2096 2097 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 2098 if (!ret) 2099 return ERR_PTR(-ENOMEM); 2100 2101 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE); 2102 if (err < 0) { 2103 kfree(ret); 2104 return ERR_PTR(err); 2105 } 2106 2107 set_delayed_call(done, kfree_link, ret); 2108 2109 return ret; 2110 } 2111 2112 // clang-format off 2113 const struct inode_operations ntfs_link_inode_operations = { 2114 .get_link = ntfs_get_link, 2115 .setattr = ntfs3_setattr, 2116 .listxattr = ntfs_listxattr, 2117 }; 2118 2119 const struct address_space_operations ntfs_aops = { 2120 .read_folio = ntfs_read_folio, 2121 .readahead = ntfs_readahead, 2122 .writepages = ntfs_writepages, 2123 .write_begin = ntfs_write_begin, 2124 .write_end = ntfs_write_end, 2125 .direct_IO = ntfs_direct_IO, 2126 .bmap = ntfs_bmap, 2127 .dirty_folio = block_dirty_folio, 2128 .migrate_folio = buffer_migrate_folio, 2129 .invalidate_folio = block_invalidate_folio, 2130 }; 2131 2132 const struct address_space_operations ntfs_aops_cmpr = { 2133 .read_folio = ntfs_read_folio, 2134 .readahead = ntfs_readahead, 2135 .dirty_folio = block_dirty_folio, 2136 }; 2137 // clang-format on 2138