1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 */ 7 8 #include <linux/buffer_head.h> 9 #include <linux/fs.h> 10 #include <linux/mpage.h> 11 #include <linux/namei.h> 12 #include <linux/nls.h> 13 #include <linux/uio.h> 14 #include <linux/writeback.h> 15 16 #include "debug.h" 17 #include "ntfs.h" 18 #include "ntfs_fs.h" 19 20 /* 21 * ntfs_read_mft - Read record and parse MFT. 22 */ 23 static struct inode *ntfs_read_mft(struct inode *inode, 24 const struct cpu_str *name, 25 const struct MFT_REF *ref) 26 { 27 int err = 0; 28 struct ntfs_inode *ni = ntfs_i(inode); 29 struct super_block *sb = inode->i_sb; 30 struct ntfs_sb_info *sbi = sb->s_fs_info; 31 mode_t mode = 0; 32 struct ATTR_STD_INFO5 *std5 = NULL; 33 struct ATTR_LIST_ENTRY *le; 34 struct ATTRIB *attr; 35 bool is_match = false; 36 bool is_root = false; 37 bool is_dir; 38 unsigned long ino = inode->i_ino; 39 u32 rp_fa = 0, asize, t32; 40 u16 roff, rsize, names = 0, links = 0; 41 const struct ATTR_FILE_NAME *fname = NULL; 42 const struct INDEX_ROOT *root; 43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes 44 u64 t64; 45 struct MFT_REC *rec; 46 struct runs_tree *run; 47 struct timespec64 ts; 48 49 inode->i_op = NULL; 50 /* Setup 'uid' and 'gid' */ 51 inode->i_uid = sbi->options->fs_uid; 52 inode->i_gid = sbi->options->fs_gid; 53 54 err = mi_init(&ni->mi, sbi, ino); 55 if (err) 56 goto out; 57 58 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) { 59 t64 = sbi->mft.lbo >> sbi->cluster_bits; 60 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size); 61 sbi->mft.ni = ni; 62 init_rwsem(&ni->file.run_lock); 63 64 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) { 65 err = -ENOMEM; 66 goto out; 67 } 68 } 69 70 err = mi_read(&ni->mi, ino == MFT_REC_MFT); 71 72 if (err) 73 goto out; 74 75 rec = ni->mi.mrec; 76 77 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) { 78 ; 79 } else if (ref->seq != rec->seq) { 80 err = -EINVAL; 81 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino, 82 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq)); 83 goto out; 84 } else if (!is_rec_inuse(rec)) { 85 err = -ESTALE; 86 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino); 87 goto out; 88 } 89 90 if (le32_to_cpu(rec->total) != sbi->record_size) { 91 /* Bad inode? */ 92 err = -EINVAL; 93 goto out; 94 } 95 96 if (!is_rec_base(rec)) { 97 err = -EINVAL; 98 goto out; 99 } 100 101 /* Record should contain $I30 root. */ 102 is_dir = rec->flags & RECORD_FLAG_DIR; 103 104 /* MFT_REC_MFT is not a dir */ 105 if (is_dir && ino == MFT_REC_MFT) { 106 err = -EINVAL; 107 goto out; 108 } 109 110 inode->i_generation = le16_to_cpu(rec->seq); 111 112 /* Enumerate all struct Attributes MFT. */ 113 le = NULL; 114 attr = NULL; 115 116 /* 117 * To reduce tab pressure use goto instead of 118 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) )) 119 */ 120 next_attr: 121 run = NULL; 122 err = -EINVAL; 123 attr = ni_enum_attr_ex(ni, attr, &le, NULL); 124 if (!attr) 125 goto end_enum; 126 127 if (le && le->vcn) { 128 /* This is non primary attribute segment. Ignore if not MFT. */ 129 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA) 130 goto next_attr; 131 132 run = &ni->file.run; 133 asize = le32_to_cpu(attr->size); 134 goto attr_unpack_run; 135 } 136 137 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off); 138 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size); 139 asize = le32_to_cpu(attr->size); 140 141 /* 142 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'. 143 * There not critical to check this case again 144 */ 145 if (attr->name_len && 146 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) > 147 asize) 148 goto out; 149 150 if (attr->non_res) { 151 t64 = le64_to_cpu(attr->nres.alloc_size); 152 if (le64_to_cpu(attr->nres.data_size) > t64 || 153 le64_to_cpu(attr->nres.valid_size) > t64) 154 goto out; 155 } 156 157 switch (attr->type) { 158 case ATTR_STD: 159 if (attr->non_res || 160 asize < sizeof(struct ATTR_STD_INFO) + roff || 161 rsize < sizeof(struct ATTR_STD_INFO)) 162 goto out; 163 164 if (std5) 165 goto next_attr; 166 167 std5 = Add2Ptr(attr, roff); 168 169 #ifdef STATX_BTIME 170 nt2kernel(std5->cr_time, &ni->i_crtime); 171 #endif 172 nt2kernel(std5->a_time, &ts); 173 inode_set_atime_to_ts(inode, ts); 174 nt2kernel(std5->c_time, &ts); 175 inode_set_ctime_to_ts(inode, ts); 176 nt2kernel(std5->m_time, &ts); 177 inode_set_mtime_to_ts(inode, ts); 178 179 ni->std_fa = std5->fa; 180 181 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && 182 rsize >= sizeof(struct ATTR_STD_INFO5)) 183 ni->std_security_id = std5->security_id; 184 goto next_attr; 185 186 case ATTR_LIST: 187 if (attr->name_len || le || ino == MFT_REC_LOG) 188 goto out; 189 190 err = ntfs_load_attr_list(ni, attr); 191 if (err) 192 goto out; 193 194 le = NULL; 195 attr = NULL; 196 goto next_attr; 197 198 case ATTR_NAME: 199 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || 200 rsize < SIZEOF_ATTRIBUTE_FILENAME) 201 goto out; 202 203 names += 1; 204 fname = Add2Ptr(attr, roff); 205 if (fname->type == FILE_NAME_DOS) 206 goto next_attr; 207 208 links += 1; 209 if (name && name->len == fname->name_len && 210 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, 211 NULL, false)) 212 is_match = true; 213 214 goto next_attr; 215 216 case ATTR_DATA: 217 if (is_dir) { 218 /* Ignore data attribute in dir record. */ 219 goto next_attr; 220 } 221 222 if (ino == MFT_REC_BADCLUST && !attr->non_res) 223 goto next_attr; 224 225 if (attr->name_len && 226 ((ino != MFT_REC_BADCLUST || !attr->non_res || 227 attr->name_len != ARRAY_SIZE(BAD_NAME) || 228 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && 229 (ino != MFT_REC_SECURE || !attr->non_res || 230 attr->name_len != ARRAY_SIZE(SDS_NAME) || 231 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { 232 /* File contains stream attribute. Ignore it. */ 233 goto next_attr; 234 } 235 236 if (is_attr_sparsed(attr)) 237 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; 238 else 239 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; 240 241 if (is_attr_compressed(attr)) 242 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; 243 else 244 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; 245 246 if (is_attr_encrypted(attr)) 247 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; 248 else 249 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; 250 251 if (!attr->non_res) { 252 ni->i_valid = inode->i_size = rsize; 253 inode_set_bytes(inode, rsize); 254 } 255 256 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); 257 258 if (!attr->non_res) { 259 ni->ni_flags |= NI_FLAG_RESIDENT; 260 goto next_attr; 261 } 262 263 inode_set_bytes(inode, attr_ondisk_size(attr)); 264 265 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 266 inode->i_size = le64_to_cpu(attr->nres.data_size); 267 if (!attr->nres.alloc_size) 268 goto next_attr; 269 270 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run : 271 &ni->file.run; 272 break; 273 274 case ATTR_ROOT: 275 if (attr->non_res) 276 goto out; 277 278 root = Add2Ptr(attr, roff); 279 280 if (attr->name_len != ARRAY_SIZE(I30_NAME) || 281 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 282 goto next_attr; 283 284 if (root->type != ATTR_NAME || 285 root->rule != NTFS_COLLATION_TYPE_FILENAME) 286 goto out; 287 288 if (!is_dir) 289 goto next_attr; 290 291 is_root = true; 292 ni->ni_flags |= NI_FLAG_DIR; 293 294 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 295 if (err) 296 goto out; 297 298 mode = sb->s_root ? 299 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) : 300 (S_IFDIR | 0777); 301 goto next_attr; 302 303 case ATTR_ALLOC: 304 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || 305 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 306 goto next_attr; 307 308 inode->i_size = le64_to_cpu(attr->nres.data_size); 309 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 310 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); 311 312 run = &ni->dir.alloc_run; 313 break; 314 315 case ATTR_BITMAP: 316 if (ino == MFT_REC_MFT) { 317 if (!attr->non_res) 318 goto out; 319 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 320 /* 0x20000000 = 2^32 / 8 */ 321 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) 322 goto out; 323 #endif 324 run = &sbi->mft.bitmap.run; 325 break; 326 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && 327 !memcmp(attr_name(attr), I30_NAME, 328 sizeof(I30_NAME)) && 329 attr->non_res) { 330 run = &ni->dir.bitmap_run; 331 break; 332 } 333 goto next_attr; 334 335 case ATTR_REPARSE: 336 if (attr->name_len) 337 goto next_attr; 338 339 rp_fa = ni_parse_reparse(ni, attr, &rp); 340 switch (rp_fa) { 341 case REPARSE_LINK: 342 /* 343 * Normal symlink. 344 * Assume one unicode symbol == one utf8. 345 */ 346 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer 347 .PrintNameLength) / 348 sizeof(u16); 349 ni->i_valid = inode->i_size; 350 /* Clear directory bit. */ 351 if (ni->ni_flags & NI_FLAG_DIR) { 352 indx_clear(&ni->dir); 353 memset(&ni->dir, 0, sizeof(ni->dir)); 354 ni->ni_flags &= ~NI_FLAG_DIR; 355 } else { 356 run_close(&ni->file.run); 357 } 358 mode = S_IFLNK | 0777; 359 is_dir = false; 360 if (attr->non_res) { 361 run = &ni->file.run; 362 goto attr_unpack_run; // Double break. 363 } 364 break; 365 366 case REPARSE_COMPRESSED: 367 break; 368 369 case REPARSE_DEDUPLICATED: 370 break; 371 } 372 goto next_attr; 373 374 case ATTR_EA_INFO: 375 if (!attr->name_len && 376 resident_data_ex(attr, sizeof(struct EA_INFO))) { 377 ni->ni_flags |= NI_FLAG_EA; 378 /* 379 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode 380 */ 381 inode->i_mode = mode; 382 ntfs_get_wsl_perm(inode); 383 mode = inode->i_mode; 384 } 385 goto next_attr; 386 387 default: 388 goto next_attr; 389 } 390 391 attr_unpack_run: 392 roff = le16_to_cpu(attr->nres.run_off); 393 394 if (roff > asize) { 395 err = -EINVAL; 396 goto out; 397 } 398 399 t64 = le64_to_cpu(attr->nres.svcn); 400 401 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), 402 t64, Add2Ptr(attr, roff), asize - roff); 403 if (err < 0) 404 goto out; 405 err = 0; 406 goto next_attr; 407 408 end_enum: 409 410 if (!std5) 411 goto out; 412 413 if (is_bad_inode(inode)) 414 goto out; 415 416 if (!is_match && name) { 417 err = -ENOENT; 418 goto out; 419 } 420 421 if (std5->fa & FILE_ATTRIBUTE_READONLY) 422 mode &= ~0222; 423 424 if (!names) { 425 err = -EINVAL; 426 goto out; 427 } 428 429 if (names != le16_to_cpu(rec->hard_links)) { 430 /* Correct minor error on the fly. Do not mark inode as dirty. */ 431 ntfs_inode_warn(inode, "Correct links count -> %u.", names); 432 rec->hard_links = cpu_to_le16(names); 433 ni->mi.dirty = true; 434 } 435 436 set_nlink(inode, links); 437 438 if (S_ISDIR(mode)) { 439 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; 440 441 /* 442 * Dot and dot-dot should be included in count but was not 443 * included in enumeration. 444 * Usually a hard links to directories are disabled. 445 */ 446 inode->i_op = &ntfs_dir_inode_operations; 447 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 448 &ntfs_legacy_dir_operations : 449 &ntfs_dir_operations; 450 ni->i_valid = 0; 451 } else if (S_ISLNK(mode)) { 452 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 453 inode->i_op = &ntfs_link_inode_operations; 454 inode->i_fop = NULL; 455 inode_nohighmem(inode); 456 } else if (S_ISREG(mode)) { 457 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 458 inode->i_op = &ntfs_file_inode_operations; 459 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 460 &ntfs_legacy_file_operations : 461 &ntfs_file_operations; 462 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 463 &ntfs_aops; 464 if (ino != MFT_REC_MFT) 465 init_rwsem(&ni->file.run_lock); 466 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || 467 S_ISSOCK(mode)) { 468 inode->i_op = &ntfs_special_inode_operations; 469 init_special_inode(inode, mode, inode->i_rdev); 470 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && 471 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { 472 /* Records in $Extend are not a files or general directories. */ 473 inode->i_op = &ntfs_file_inode_operations; 474 mode = S_IFREG; 475 } else { 476 err = -EINVAL; 477 goto out; 478 } 479 480 if ((sbi->options->sys_immutable && 481 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 482 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 483 inode->i_flags |= S_IMMUTABLE; 484 } else { 485 inode->i_flags &= ~S_IMMUTABLE; 486 } 487 488 inode->i_mode = mode; 489 if (!(ni->ni_flags & NI_FLAG_EA)) { 490 /* If no xattr then no security (stored in xattr). */ 491 inode->i_flags |= S_NOSEC; 492 } 493 494 if (ino == MFT_REC_MFT && !sb->s_root) 495 sbi->mft.ni = NULL; 496 497 unlock_new_inode(inode); 498 499 return inode; 500 501 out: 502 if (ino == MFT_REC_MFT && !sb->s_root) 503 sbi->mft.ni = NULL; 504 505 iget_failed(inode); 506 return ERR_PTR(err); 507 } 508 509 /* 510 * ntfs_test_inode 511 * 512 * Return: 1 if match. 513 */ 514 static int ntfs_test_inode(struct inode *inode, void *data) 515 { 516 struct MFT_REF *ref = data; 517 518 return ino_get(ref) == inode->i_ino; 519 } 520 521 static int ntfs_set_inode(struct inode *inode, void *data) 522 { 523 const struct MFT_REF *ref = data; 524 525 inode->i_ino = ino_get(ref); 526 return 0; 527 } 528 529 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 530 const struct cpu_str *name) 531 { 532 struct inode *inode; 533 534 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 535 (void *)ref); 536 if (unlikely(!inode)) 537 return ERR_PTR(-ENOMEM); 538 539 /* If this is a freshly allocated inode, need to read it now. */ 540 if (inode->i_state & I_NEW) 541 inode = ntfs_read_mft(inode, name, ref); 542 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 543 /* 544 * Sequence number is not expected. 545 * Looks like inode was reused but caller uses the old reference 546 */ 547 iput(inode); 548 inode = ERR_PTR(-ESTALE); 549 } 550 551 if (IS_ERR(inode)) 552 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR); 553 554 return inode; 555 } 556 557 enum get_block_ctx { 558 GET_BLOCK_GENERAL = 0, 559 GET_BLOCK_WRITE_BEGIN = 1, 560 GET_BLOCK_DIRECT_IO_R = 2, 561 GET_BLOCK_DIRECT_IO_W = 3, 562 GET_BLOCK_BMAP = 4, 563 }; 564 565 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 566 struct buffer_head *bh, int create, 567 enum get_block_ctx ctx) 568 { 569 struct super_block *sb = inode->i_sb; 570 struct ntfs_sb_info *sbi = sb->s_fs_info; 571 struct ntfs_inode *ni = ntfs_i(inode); 572 struct folio *folio = bh->b_folio; 573 u8 cluster_bits = sbi->cluster_bits; 574 u32 block_size = sb->s_blocksize; 575 u64 bytes, lbo, valid; 576 u32 off; 577 int err; 578 CLST vcn, lcn, len; 579 bool new; 580 581 /* Clear previous state. */ 582 clear_buffer_new(bh); 583 clear_buffer_uptodate(bh); 584 585 if (is_resident(ni)) { 586 bh->b_blocknr = RESIDENT_LCN; 587 bh->b_size = block_size; 588 if (!folio) { 589 /* direct io (read) or bmap call */ 590 err = 0; 591 } else { 592 ni_lock(ni); 593 err = attr_data_read_resident(ni, folio); 594 ni_unlock(ni); 595 596 if (!err) 597 set_buffer_uptodate(bh); 598 } 599 return err; 600 } 601 602 vcn = vbo >> cluster_bits; 603 off = vbo & sbi->cluster_mask; 604 new = false; 605 606 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL, 607 create && sbi->cluster_size > PAGE_SIZE); 608 if (err) 609 goto out; 610 611 if (!len) 612 return 0; 613 614 bytes = ((u64)len << cluster_bits) - off; 615 616 if (lcn >= sbi->used.bitmap.nbits) { 617 /* This case includes resident/compressed/sparse. */ 618 if (!create) { 619 if (bh->b_size > bytes) 620 bh->b_size = bytes; 621 return 0; 622 } 623 WARN_ON(1); 624 } 625 626 if (new) 627 set_buffer_new(bh); 628 629 lbo = ((u64)lcn << cluster_bits) + off; 630 631 set_buffer_mapped(bh); 632 bh->b_bdev = sb->s_bdev; 633 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 634 635 valid = ni->i_valid; 636 637 if (ctx == GET_BLOCK_DIRECT_IO_W) { 638 /* ntfs_direct_IO will update ni->i_valid. */ 639 if (vbo >= valid) 640 set_buffer_new(bh); 641 } else if (create) { 642 /* Normal write. */ 643 if (bytes > bh->b_size) 644 bytes = bh->b_size; 645 646 if (vbo >= valid) 647 set_buffer_new(bh); 648 649 if (vbo + bytes > valid) { 650 ni->i_valid = vbo + bytes; 651 mark_inode_dirty(inode); 652 } 653 } else if (vbo >= valid) { 654 /* Read out of valid data. */ 655 clear_buffer_mapped(bh); 656 } else if (vbo + bytes <= valid) { 657 /* Normal read. */ 658 } else if (vbo + block_size <= valid) { 659 /* Normal short read. */ 660 bytes = block_size; 661 } else { 662 /* 663 * Read across valid size: vbo < valid && valid < vbo + block_size 664 */ 665 bytes = block_size; 666 667 if (folio) { 668 u32 voff = valid - vbo; 669 670 bh->b_size = block_size; 671 off = vbo & (PAGE_SIZE - 1); 672 folio_set_bh(bh, folio, off); 673 674 if (bh_read(bh, 0) < 0) { 675 err = -EIO; 676 goto out; 677 } 678 folio_zero_segment(folio, off + voff, off + block_size); 679 } 680 } 681 682 if (bh->b_size > bytes) 683 bh->b_size = bytes; 684 685 #ifndef __LP64__ 686 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 687 static_assert(sizeof(size_t) < sizeof(loff_t)); 688 if (bytes > 0x40000000u) 689 bh->b_size = 0x40000000u; 690 } 691 #endif 692 693 return 0; 694 695 out: 696 return err; 697 } 698 699 int ntfs_get_block(struct inode *inode, sector_t vbn, 700 struct buffer_head *bh_result, int create) 701 { 702 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 703 bh_result, create, GET_BLOCK_GENERAL); 704 } 705 706 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 707 struct buffer_head *bh_result, int create) 708 { 709 return ntfs_get_block_vbo(inode, 710 (u64)vsn << inode->i_sb->s_blocksize_bits, 711 bh_result, create, GET_BLOCK_BMAP); 712 } 713 714 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 715 { 716 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 717 } 718 719 static int ntfs_read_folio(struct file *file, struct folio *folio) 720 { 721 int err; 722 struct address_space *mapping = folio->mapping; 723 struct inode *inode = mapping->host; 724 struct ntfs_inode *ni = ntfs_i(inode); 725 726 if (is_resident(ni)) { 727 ni_lock(ni); 728 err = attr_data_read_resident(ni, folio); 729 ni_unlock(ni); 730 if (err != E_NTFS_NONRESIDENT) { 731 folio_unlock(folio); 732 return err; 733 } 734 } 735 736 if (is_compressed(ni)) { 737 ni_lock(ni); 738 err = ni_readpage_cmpr(ni, folio); 739 ni_unlock(ni); 740 return err; 741 } 742 743 /* Normal + sparse files. */ 744 return mpage_read_folio(folio, ntfs_get_block); 745 } 746 747 static void ntfs_readahead(struct readahead_control *rac) 748 { 749 struct address_space *mapping = rac->mapping; 750 struct inode *inode = mapping->host; 751 struct ntfs_inode *ni = ntfs_i(inode); 752 u64 valid; 753 loff_t pos; 754 755 if (is_resident(ni)) { 756 /* No readahead for resident. */ 757 return; 758 } 759 760 if (is_compressed(ni)) { 761 /* No readahead for compressed. */ 762 return; 763 } 764 765 valid = ni->i_valid; 766 pos = readahead_pos(rac); 767 768 if (valid < i_size_read(inode) && pos <= valid && 769 valid < pos + readahead_length(rac)) { 770 /* Range cross 'valid'. Read it page by page. */ 771 return; 772 } 773 774 mpage_readahead(rac, ntfs_get_block); 775 } 776 777 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 778 struct buffer_head *bh_result, int create) 779 { 780 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 781 bh_result, create, GET_BLOCK_DIRECT_IO_R); 782 } 783 784 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 785 struct buffer_head *bh_result, int create) 786 { 787 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 788 bh_result, create, GET_BLOCK_DIRECT_IO_W); 789 } 790 791 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 792 { 793 struct file *file = iocb->ki_filp; 794 struct address_space *mapping = file->f_mapping; 795 struct inode *inode = mapping->host; 796 struct ntfs_inode *ni = ntfs_i(inode); 797 loff_t vbo = iocb->ki_pos; 798 loff_t end; 799 int wr = iov_iter_rw(iter) & WRITE; 800 size_t iter_count = iov_iter_count(iter); 801 loff_t valid; 802 ssize_t ret; 803 804 if (is_resident(ni)) { 805 /* Switch to buffered write. */ 806 ret = 0; 807 goto out; 808 } 809 if (is_compressed(ni)) { 810 ret = 0; 811 goto out; 812 } 813 814 ret = blockdev_direct_IO(iocb, inode, iter, 815 wr ? ntfs_get_block_direct_IO_W : 816 ntfs_get_block_direct_IO_R); 817 818 if (ret > 0) 819 end = vbo + ret; 820 else if (wr && ret == -EIOCBQUEUED) 821 end = vbo + iter_count; 822 else 823 goto out; 824 825 valid = ni->i_valid; 826 if (wr) { 827 if (end > valid && !S_ISBLK(inode->i_mode)) { 828 ni->i_valid = end; 829 mark_inode_dirty(inode); 830 } 831 } else if (vbo < valid && valid < end) { 832 /* Fix page. */ 833 iov_iter_revert(iter, end - valid); 834 iov_iter_zero(end - valid, iter); 835 } 836 837 out: 838 return ret; 839 } 840 841 int ntfs_set_size(struct inode *inode, u64 new_size) 842 { 843 struct super_block *sb = inode->i_sb; 844 struct ntfs_sb_info *sbi = sb->s_fs_info; 845 struct ntfs_inode *ni = ntfs_i(inode); 846 int err; 847 848 /* Check for maximum file size. */ 849 if (is_sparsed(ni) || is_compressed(ni)) { 850 if (new_size > sbi->maxbytes_sparse) { 851 err = -EFBIG; 852 goto out; 853 } 854 } else if (new_size > sbi->maxbytes) { 855 err = -EFBIG; 856 goto out; 857 } 858 859 ni_lock(ni); 860 down_write(&ni->file.run_lock); 861 862 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 863 &ni->i_valid, true, NULL); 864 865 up_write(&ni->file.run_lock); 866 ni_unlock(ni); 867 868 mark_inode_dirty(inode); 869 870 out: 871 return err; 872 } 873 874 static int ntfs_resident_writepage(struct folio *folio, 875 struct writeback_control *wbc) 876 { 877 struct address_space *mapping = folio->mapping; 878 struct inode *inode = mapping->host; 879 struct ntfs_inode *ni = ntfs_i(inode); 880 int ret; 881 882 /* Avoid any operation if inode is bad. */ 883 if (unlikely(is_bad_ni(ni))) 884 return -EINVAL; 885 886 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 887 return -EIO; 888 889 ni_lock(ni); 890 ret = attr_data_write_resident(ni, folio); 891 ni_unlock(ni); 892 893 if (ret != E_NTFS_NONRESIDENT) 894 folio_unlock(folio); 895 mapping_set_error(mapping, ret); 896 return ret; 897 } 898 899 static int ntfs_writepages(struct address_space *mapping, 900 struct writeback_control *wbc) 901 { 902 struct inode *inode = mapping->host; 903 904 /* Avoid any operation if inode is bad. */ 905 if (unlikely(is_bad_ni(ntfs_i(inode)))) 906 return -EINVAL; 907 908 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 909 return -EIO; 910 911 if (is_resident(ntfs_i(inode))) { 912 struct folio *folio = NULL; 913 int error; 914 915 while ((folio = writeback_iter(mapping, wbc, folio, &error))) 916 error = ntfs_resident_writepage(folio, wbc); 917 return error; 918 } 919 return mpage_writepages(mapping, wbc, ntfs_get_block); 920 } 921 922 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 923 struct buffer_head *bh_result, int create) 924 { 925 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 926 bh_result, create, GET_BLOCK_WRITE_BEGIN); 927 } 928 929 int ntfs_write_begin(const struct kiocb *iocb, struct address_space *mapping, 930 loff_t pos, u32 len, struct folio **foliop, void **fsdata) 931 { 932 int err; 933 struct inode *inode = mapping->host; 934 struct ntfs_inode *ni = ntfs_i(inode); 935 936 /* Avoid any operation if inode is bad. */ 937 if (unlikely(is_bad_ni(ni))) 938 return -EINVAL; 939 940 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 941 return -EIO; 942 943 if (is_resident(ni)) { 944 struct folio *folio = __filemap_get_folio( 945 mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN, 946 mapping_gfp_mask(mapping)); 947 948 if (IS_ERR(folio)) { 949 err = PTR_ERR(folio); 950 goto out; 951 } 952 953 ni_lock(ni); 954 err = attr_data_read_resident(ni, folio); 955 ni_unlock(ni); 956 957 if (!err) { 958 *foliop = folio; 959 goto out; 960 } 961 folio_unlock(folio); 962 folio_put(folio); 963 964 if (err != E_NTFS_NONRESIDENT) 965 goto out; 966 } 967 968 err = block_write_begin(mapping, pos, len, foliop, 969 ntfs_get_block_write_begin); 970 971 out: 972 return err; 973 } 974 975 /* 976 * ntfs_write_end - Address_space_operations::write_end. 977 */ 978 int ntfs_write_end(const struct kiocb *iocb, 979 struct address_space *mapping, loff_t pos, 980 u32 len, u32 copied, struct folio *folio, void *fsdata) 981 { 982 struct inode *inode = mapping->host; 983 struct ntfs_inode *ni = ntfs_i(inode); 984 u64 valid = ni->i_valid; 985 bool dirty = false; 986 int err; 987 988 if (is_resident(ni)) { 989 ni_lock(ni); 990 err = attr_data_write_resident(ni, folio); 991 ni_unlock(ni); 992 if (!err) { 993 struct buffer_head *head = folio_buffers(folio); 994 dirty = true; 995 /* Clear any buffers in folio. */ 996 if (head) { 997 struct buffer_head *bh = head; 998 999 do { 1000 clear_buffer_dirty(bh); 1001 clear_buffer_mapped(bh); 1002 set_buffer_uptodate(bh); 1003 } while (head != (bh = bh->b_this_page)); 1004 } 1005 folio_mark_uptodate(folio); 1006 err = copied; 1007 } 1008 folio_unlock(folio); 1009 folio_put(folio); 1010 } else { 1011 err = generic_write_end(iocb, mapping, pos, len, copied, folio, 1012 fsdata); 1013 } 1014 1015 if (err >= 0) { 1016 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 1017 inode_set_mtime_to_ts(inode, 1018 inode_set_ctime_current(inode)); 1019 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 1020 dirty = true; 1021 } 1022 1023 if (valid != ni->i_valid) { 1024 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 1025 dirty = true; 1026 } 1027 1028 if (pos + err > inode->i_size) { 1029 i_size_write(inode, pos + err); 1030 dirty = true; 1031 } 1032 1033 if (dirty) 1034 mark_inode_dirty(inode); 1035 } 1036 1037 return err; 1038 } 1039 1040 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1041 { 1042 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1043 } 1044 1045 int ntfs_sync_inode(struct inode *inode) 1046 { 1047 return _ni_write_inode(inode, 1); 1048 } 1049 1050 /* 1051 * Helper function to read file. 1052 */ 1053 int inode_read_data(struct inode *inode, void *data, size_t bytes) 1054 { 1055 pgoff_t idx; 1056 struct address_space *mapping = inode->i_mapping; 1057 1058 for (idx = 0; bytes; idx++) { 1059 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1060 struct page *page = read_mapping_page(mapping, idx, NULL); 1061 void *kaddr; 1062 1063 if (IS_ERR(page)) 1064 return PTR_ERR(page); 1065 1066 kaddr = kmap_atomic(page); 1067 memcpy(data, kaddr, op); 1068 kunmap_atomic(kaddr); 1069 1070 put_page(page); 1071 1072 bytes -= op; 1073 data = Add2Ptr(data, PAGE_SIZE); 1074 } 1075 return 0; 1076 } 1077 1078 /* 1079 * ntfs_reparse_bytes 1080 * 1081 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1082 * for unicode string of @uni_len length. 1083 */ 1084 static inline u32 ntfs_reparse_bytes(u32 uni_len, bool is_absolute) 1085 { 1086 /* Header + unicode string + decorated unicode string. */ 1087 return sizeof(short) * (2 * uni_len + (is_absolute ? 4 : 0)) + 1088 offsetof(struct REPARSE_DATA_BUFFER, 1089 SymbolicLinkReparseBuffer.PathBuffer); 1090 } 1091 1092 static struct REPARSE_DATA_BUFFER * 1093 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1094 u32 size, u16 *nsize) 1095 { 1096 int i, err; 1097 struct REPARSE_DATA_BUFFER *rp; 1098 __le16 *rp_name; 1099 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1100 bool is_absolute; 1101 1102 is_absolute = (strlen(symname) > 1 && symname[1] == ':'); 1103 1104 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2, is_absolute), GFP_NOFS); 1105 if (!rp) 1106 return ERR_PTR(-ENOMEM); 1107 1108 rs = &rp->SymbolicLinkReparseBuffer; 1109 rp_name = rs->PathBuffer; 1110 1111 /* Convert link name to UTF-16. */ 1112 err = ntfs_nls_to_utf16(sbi, symname, size, 1113 (struct cpu_str *)(rp_name - 1), 2 * size, 1114 UTF16_LITTLE_ENDIAN); 1115 if (err < 0) 1116 goto out; 1117 1118 /* err = the length of unicode name of symlink. */ 1119 *nsize = ntfs_reparse_bytes(err, is_absolute); 1120 1121 if (*nsize > sbi->reparse.max_size) { 1122 err = -EFBIG; 1123 goto out; 1124 } 1125 1126 /* Translate Linux '/' into Windows '\'. */ 1127 for (i = 0; i < err; i++) { 1128 if (rp_name[i] == cpu_to_le16('/')) 1129 rp_name[i] = cpu_to_le16('\\'); 1130 } 1131 1132 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1133 rp->ReparseDataLength = 1134 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1135 SymbolicLinkReparseBuffer)); 1136 1137 /* PrintName + SubstituteName. */ 1138 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1139 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + (is_absolute ? 8 : 0)); 1140 rs->PrintNameLength = rs->SubstituteNameOffset; 1141 1142 /* 1143 * TODO: Use relative path if possible to allow Windows to 1144 * parse this path. 1145 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1146 */ 1147 rs->Flags = cpu_to_le32(is_absolute ? 0 : SYMLINK_FLAG_RELATIVE); 1148 1149 memmove(rp_name + err + (is_absolute ? 4 : 0), rp_name, sizeof(short) * err); 1150 1151 if (is_absolute) { 1152 /* Decorate SubstituteName. */ 1153 rp_name += err; 1154 rp_name[0] = cpu_to_le16('\\'); 1155 rp_name[1] = cpu_to_le16('?'); 1156 rp_name[2] = cpu_to_le16('?'); 1157 rp_name[3] = cpu_to_le16('\\'); 1158 } 1159 1160 return rp; 1161 out: 1162 kfree(rp); 1163 return ERR_PTR(err); 1164 } 1165 1166 /* 1167 * ntfs_create_inode 1168 * 1169 * Helper function for: 1170 * - ntfs_create 1171 * - ntfs_mknod 1172 * - ntfs_symlink 1173 * - ntfs_mkdir 1174 * - ntfs_atomic_open 1175 * 1176 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked 1177 */ 1178 int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, 1179 struct dentry *dentry, const struct cpu_str *uni, 1180 umode_t mode, dev_t dev, const char *symname, u32 size, 1181 struct ntfs_fnd *fnd) 1182 { 1183 int err; 1184 struct super_block *sb = dir->i_sb; 1185 struct ntfs_sb_info *sbi = sb->s_fs_info; 1186 const struct qstr *name = &dentry->d_name; 1187 CLST ino = 0; 1188 struct ntfs_inode *dir_ni = ntfs_i(dir); 1189 struct ntfs_inode *ni = NULL; 1190 struct inode *inode = NULL; 1191 struct ATTRIB *attr; 1192 struct ATTR_STD_INFO5 *std5; 1193 struct ATTR_FILE_NAME *fname; 1194 struct MFT_REC *rec; 1195 u32 asize, dsize, sd_size; 1196 enum FILE_ATTRIBUTE fa; 1197 __le32 security_id = SECURITY_ID_INVALID; 1198 CLST vcn; 1199 const void *sd; 1200 u16 t16, nsize = 0, aid = 0; 1201 struct INDEX_ROOT *root, *dir_root; 1202 struct NTFS_DE *e, *new_de = NULL; 1203 struct REPARSE_DATA_BUFFER *rp = NULL; 1204 bool rp_inserted = false; 1205 1206 /* New file will be resident or non resident. */ 1207 const bool new_file_resident = 1; 1208 1209 if (!fnd) 1210 ni_lock_dir(dir_ni); 1211 1212 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1213 if (!dir_root) { 1214 err = -EINVAL; 1215 goto out1; 1216 } 1217 1218 if (S_ISDIR(mode)) { 1219 /* Use parent's directory attributes. */ 1220 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1221 FILE_ATTRIBUTE_ARCHIVE; 1222 /* 1223 * By default child directory inherits parent attributes. 1224 * Root directory is hidden + system. 1225 * Make an exception for children in root. 1226 */ 1227 if (dir->i_ino == MFT_REC_ROOT) 1228 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1229 } else if (S_ISLNK(mode)) { 1230 /* It is good idea that link should be the same type (file/dir) as target */ 1231 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1232 1233 /* 1234 * Linux: there are dir/file/symlink and so on. 1235 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1236 * It is good idea to create: 1237 * dir + reparse if 'symname' points to directory 1238 * or 1239 * file + reparse if 'symname' points to file 1240 * Unfortunately kern_path hangs if symname contains 'dir'. 1241 */ 1242 1243 /* 1244 * struct path path; 1245 * 1246 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1247 * struct inode *target = d_inode(path.dentry); 1248 * 1249 * if (S_ISDIR(target->i_mode)) 1250 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1251 * // if ( target->i_sb == sb ){ 1252 * // use relative path? 1253 * // } 1254 * path_put(&path); 1255 * } 1256 */ 1257 } else if (S_ISREG(mode)) { 1258 if (sbi->options->sparse) { 1259 /* Sparsed regular file, cause option 'sparse'. */ 1260 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1261 FILE_ATTRIBUTE_ARCHIVE; 1262 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1263 /* Compressed regular file, if parent is compressed. */ 1264 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1265 } else { 1266 /* Regular file, default attributes. */ 1267 fa = FILE_ATTRIBUTE_ARCHIVE; 1268 } 1269 } else { 1270 fa = FILE_ATTRIBUTE_ARCHIVE; 1271 } 1272 1273 /* If option "hide_dot_files" then set hidden attribute for dot files. */ 1274 if (sbi->options->hide_dot_files && name->name[0] == '.') 1275 fa |= FILE_ATTRIBUTE_HIDDEN; 1276 1277 if (!(mode & 0222)) 1278 fa |= FILE_ATTRIBUTE_READONLY; 1279 1280 /* Allocate PATH_MAX bytes. */ 1281 new_de = __getname(); 1282 if (!new_de) { 1283 err = -ENOMEM; 1284 goto out1; 1285 } 1286 1287 /* Avoid any operation if inode is bad. */ 1288 if (unlikely(is_bad_ni(dir_ni))) { 1289 err = -EINVAL; 1290 goto out2; 1291 } 1292 1293 if (unlikely(ntfs3_forced_shutdown(sb))) { 1294 err = -EIO; 1295 goto out2; 1296 } 1297 1298 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1299 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1300 1301 /* Step 1: allocate and fill new mft record. */ 1302 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1303 if (err) 1304 goto out2; 1305 1306 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); 1307 if (IS_ERR(ni)) { 1308 err = PTR_ERR(ni); 1309 ni = NULL; 1310 goto out3; 1311 } 1312 inode = &ni->vfs_inode; 1313 inode_init_owner(idmap, inode, dir, mode); 1314 mode = inode->i_mode; 1315 1316 ni->i_crtime = current_time(inode); 1317 1318 rec = ni->mi.mrec; 1319 rec->hard_links = cpu_to_le16(1); 1320 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1321 1322 /* Get default security id. */ 1323 sd = s_default_security; 1324 sd_size = sizeof(s_default_security); 1325 1326 if (is_ntfs3(sbi)) { 1327 security_id = dir_ni->std_security_id; 1328 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1329 security_id = sbi->security.def_security_id; 1330 1331 if (security_id == SECURITY_ID_INVALID && 1332 !ntfs_insert_security(sbi, sd, sd_size, 1333 &security_id, NULL)) 1334 sbi->security.def_security_id = security_id; 1335 } 1336 } 1337 1338 /* Insert standard info. */ 1339 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1340 1341 if (security_id == SECURITY_ID_INVALID) { 1342 dsize = sizeof(struct ATTR_STD_INFO); 1343 } else { 1344 dsize = sizeof(struct ATTR_STD_INFO5); 1345 std5->security_id = security_id; 1346 ni->std_security_id = security_id; 1347 } 1348 asize = SIZEOF_RESIDENT + dsize; 1349 1350 attr->type = ATTR_STD; 1351 attr->size = cpu_to_le32(asize); 1352 attr->id = cpu_to_le16(aid++); 1353 attr->res.data_off = SIZEOF_RESIDENT_LE; 1354 attr->res.data_size = cpu_to_le32(dsize); 1355 1356 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1357 kernel2nt(&ni->i_crtime); 1358 1359 std5->fa = ni->std_fa = fa; 1360 1361 attr = Add2Ptr(attr, asize); 1362 1363 /* Insert file name. */ 1364 err = fill_name_de(sbi, new_de, name, uni); 1365 if (err) 1366 goto out4; 1367 1368 mi_get_ref(&ni->mi, &new_de->ref); 1369 1370 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1371 1372 if (sbi->options->windows_names && 1373 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) { 1374 err = -EINVAL; 1375 goto out4; 1376 } 1377 1378 mi_get_ref(&dir_ni->mi, &fname->home); 1379 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1380 fname->dup.a_time = std5->cr_time; 1381 fname->dup.alloc_size = fname->dup.data_size = 0; 1382 fname->dup.fa = std5->fa; 1383 fname->dup.extend_data = S_ISLNK(mode) ? IO_REPARSE_TAG_SYMLINK : 0; 1384 1385 dsize = le16_to_cpu(new_de->key_size); 1386 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1387 1388 attr->type = ATTR_NAME; 1389 attr->size = cpu_to_le32(asize); 1390 attr->res.data_off = SIZEOF_RESIDENT_LE; 1391 attr->res.flags = RESIDENT_FLAG_INDEXED; 1392 attr->id = cpu_to_le16(aid++); 1393 attr->res.data_size = cpu_to_le32(dsize); 1394 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1395 1396 attr = Add2Ptr(attr, asize); 1397 1398 if (security_id == SECURITY_ID_INVALID) { 1399 /* Insert security attribute. */ 1400 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1401 1402 attr->type = ATTR_SECURE; 1403 attr->size = cpu_to_le32(asize); 1404 attr->id = cpu_to_le16(aid++); 1405 attr->res.data_off = SIZEOF_RESIDENT_LE; 1406 attr->res.data_size = cpu_to_le32(sd_size); 1407 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1408 1409 attr = Add2Ptr(attr, asize); 1410 } 1411 1412 attr->id = cpu_to_le16(aid++); 1413 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1414 /* 1415 * Regular directory or symlink to directory. 1416 * Create root attribute. 1417 */ 1418 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1419 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1420 1421 attr->type = ATTR_ROOT; 1422 attr->size = cpu_to_le32(asize); 1423 1424 attr->name_len = ARRAY_SIZE(I30_NAME); 1425 attr->name_off = SIZEOF_RESIDENT_LE; 1426 attr->res.data_off = 1427 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1428 attr->res.data_size = cpu_to_le32(dsize); 1429 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1430 sizeof(I30_NAME)); 1431 1432 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1433 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1434 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); 1435 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1436 sizeof(struct NTFS_DE)); 1437 root->ihdr.total = root->ihdr.used; 1438 1439 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1440 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1441 e->flags = NTFS_IE_LAST; 1442 } else if (S_ISLNK(mode)) { 1443 /* 1444 * Symlink to file. 1445 * Create empty resident data attribute. 1446 */ 1447 asize = SIZEOF_RESIDENT; 1448 1449 /* Insert empty ATTR_DATA */ 1450 attr->type = ATTR_DATA; 1451 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1452 attr->name_off = SIZEOF_RESIDENT_LE; 1453 attr->res.data_off = SIZEOF_RESIDENT_LE; 1454 } else if (!new_file_resident && S_ISREG(mode)) { 1455 /* 1456 * Regular file. Create empty non resident data attribute. 1457 */ 1458 attr->type = ATTR_DATA; 1459 attr->non_res = 1; 1460 attr->nres.evcn = cpu_to_le64(-1ll); 1461 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1462 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1463 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1464 attr->flags = ATTR_FLAG_SPARSED; 1465 asize = SIZEOF_NONRESIDENT_EX + 8; 1466 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1467 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1468 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1469 attr->flags = ATTR_FLAG_COMPRESSED; 1470 attr->nres.c_unit = NTFS_LZNT_CUNIT; 1471 asize = SIZEOF_NONRESIDENT_EX + 8; 1472 } else { 1473 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1474 attr->name_off = SIZEOF_NONRESIDENT_LE; 1475 asize = SIZEOF_NONRESIDENT + 8; 1476 } 1477 attr->nres.run_off = attr->name_off; 1478 } else { 1479 /* 1480 * Node. Create empty resident data attribute. 1481 */ 1482 attr->type = ATTR_DATA; 1483 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1484 attr->name_off = SIZEOF_RESIDENT_LE; 1485 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1486 attr->flags = ATTR_FLAG_SPARSED; 1487 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1488 attr->flags = ATTR_FLAG_COMPRESSED; 1489 attr->res.data_off = SIZEOF_RESIDENT_LE; 1490 asize = SIZEOF_RESIDENT; 1491 ni->ni_flags |= NI_FLAG_RESIDENT; 1492 } 1493 1494 if (S_ISDIR(mode)) { 1495 ni->ni_flags |= NI_FLAG_DIR; 1496 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1497 if (err) 1498 goto out4; 1499 } else if (S_ISLNK(mode)) { 1500 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1501 1502 if (IS_ERR(rp)) { 1503 err = PTR_ERR(rp); 1504 rp = NULL; 1505 goto out4; 1506 } 1507 1508 /* 1509 * Insert ATTR_REPARSE. 1510 */ 1511 attr = Add2Ptr(attr, asize); 1512 attr->type = ATTR_REPARSE; 1513 attr->id = cpu_to_le16(aid++); 1514 1515 /* Resident or non resident? */ 1516 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1517 t16 = PtrOffset(rec, attr); 1518 1519 /* 1520 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1521 * It is good idea to keep extended attributes resident. 1522 */ 1523 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1524 CLST alen; 1525 CLST clst = bytes_to_cluster(sbi, nsize); 1526 1527 /* Bytes per runs. */ 1528 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1529 1530 attr->non_res = 1; 1531 attr->nres.evcn = cpu_to_le64(clst - 1); 1532 attr->name_off = SIZEOF_NONRESIDENT_LE; 1533 attr->nres.run_off = attr->name_off; 1534 attr->nres.data_size = cpu_to_le64(nsize); 1535 attr->nres.valid_size = attr->nres.data_size; 1536 attr->nres.alloc_size = 1537 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1538 1539 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1540 clst, NULL, ALLOCATE_DEF, 1541 &alen, 0, NULL, NULL); 1542 if (err) 1543 goto out5; 1544 1545 err = run_pack(&ni->file.run, 0, clst, 1546 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1547 &vcn); 1548 if (err < 0) 1549 goto out5; 1550 1551 if (vcn != clst) { 1552 err = -EINVAL; 1553 goto out5; 1554 } 1555 1556 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1557 /* Write non resident data. */ 1558 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, 1559 nsize, 0); 1560 if (err) 1561 goto out5; 1562 } else { 1563 attr->res.data_off = SIZEOF_RESIDENT_LE; 1564 attr->res.data_size = cpu_to_le32(nsize); 1565 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1566 } 1567 /* Size of symlink equals the length of input string. */ 1568 inode->i_size = size; 1569 1570 attr->size = cpu_to_le32(asize); 1571 1572 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1573 &new_de->ref); 1574 if (err) 1575 goto out5; 1576 1577 rp_inserted = true; 1578 } 1579 1580 attr = Add2Ptr(attr, asize); 1581 attr->type = ATTR_END; 1582 1583 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1584 rec->next_attr_id = cpu_to_le16(aid); 1585 1586 inode->i_generation = le16_to_cpu(rec->seq); 1587 1588 if (S_ISDIR(mode)) { 1589 inode->i_op = &ntfs_dir_inode_operations; 1590 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 1591 &ntfs_legacy_dir_operations : 1592 &ntfs_dir_operations; 1593 } else if (S_ISLNK(mode)) { 1594 inode->i_op = &ntfs_link_inode_operations; 1595 inode->i_fop = NULL; 1596 inode->i_mapping->a_ops = &ntfs_aops; 1597 inode->i_size = size; 1598 inode_nohighmem(inode); 1599 } else if (S_ISREG(mode)) { 1600 inode->i_op = &ntfs_file_inode_operations; 1601 inode->i_fop = unlikely(is_legacy_ntfs(sb)) ? 1602 &ntfs_legacy_file_operations : 1603 &ntfs_file_operations; 1604 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 1605 &ntfs_aops; 1606 init_rwsem(&ni->file.run_lock); 1607 } else { 1608 inode->i_op = &ntfs_special_inode_operations; 1609 init_special_inode(inode, mode, dev); 1610 } 1611 1612 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1613 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1614 err = ntfs_init_acl(idmap, inode, dir); 1615 if (err) 1616 goto out5; 1617 } else 1618 #endif 1619 { 1620 inode->i_flags |= S_NOSEC; 1621 } 1622 1623 if (!S_ISLNK(mode)) { 1624 /* 1625 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. 1626 * The packed size of extended attribute is stored in direntry too. 1627 * 'fname' here points to inside new_de. 1628 */ 1629 err = ntfs_save_wsl_perm(inode, &fname->dup.extend_data); 1630 if (err) 1631 goto out6; 1632 1633 /* 1634 * update ea_size in file_name attribute too. 1635 * Use ni_find_attr cause layout of MFT record may be changed 1636 * in ntfs_init_acl and ntfs_save_wsl_perm. 1637 */ 1638 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL); 1639 if (attr) { 1640 struct ATTR_FILE_NAME *fn; 1641 1642 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1643 if (fn) 1644 fn->dup.extend_data = fname->dup.extend_data; 1645 } 1646 } 1647 1648 /* We do not need to update parent directory later */ 1649 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; 1650 1651 /* Step 2: Add new name in index. */ 1652 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1653 if (err) 1654 goto out6; 1655 1656 /* 1657 * Call 'd_instantiate' after inode->i_op is set 1658 * but before finish_open. 1659 */ 1660 d_instantiate(dentry, inode); 1661 1662 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ 1663 inode_set_atime_to_ts(inode, ni->i_crtime); 1664 inode_set_ctime_to_ts(inode, ni->i_crtime); 1665 inode_set_mtime_to_ts(inode, ni->i_crtime); 1666 inode_set_mtime_to_ts(dir, ni->i_crtime); 1667 inode_set_ctime_to_ts(dir, ni->i_crtime); 1668 1669 mark_inode_dirty(dir); 1670 mark_inode_dirty(inode); 1671 1672 /* Normal exit. */ 1673 goto out2; 1674 1675 out6: 1676 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL); 1677 if (attr && attr->non_res) { 1678 /* Delete ATTR_EA, if non-resident. */ 1679 struct runs_tree run; 1680 run_init(&run); 1681 attr_set_size(ni, ATTR_EA, NULL, 0, &run, 0, NULL, false, NULL); 1682 run_close(&run); 1683 } 1684 1685 if (rp_inserted) 1686 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1687 1688 out5: 1689 if (!S_ISDIR(mode)) 1690 run_deallocate(sbi, &ni->file.run, false); 1691 1692 out4: 1693 clear_rec_inuse(rec); 1694 clear_nlink(inode); 1695 ni->mi.dirty = false; 1696 discard_new_inode(inode); 1697 out3: 1698 ntfs_mark_rec_free(sbi, ino, false); 1699 1700 out2: 1701 __putname(new_de); 1702 kfree(rp); 1703 1704 out1: 1705 if (!fnd) 1706 ni_unlock(dir_ni); 1707 1708 if (!err) 1709 unlock_new_inode(inode); 1710 1711 return err; 1712 } 1713 1714 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1715 { 1716 int err; 1717 struct ntfs_inode *ni = ntfs_i(inode); 1718 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1719 struct NTFS_DE *de; 1720 1721 /* Allocate PATH_MAX bytes. */ 1722 de = __getname(); 1723 if (!de) 1724 return -ENOMEM; 1725 1726 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1727 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1728 1729 /* Construct 'de'. */ 1730 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1731 if (err) 1732 goto out; 1733 1734 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1735 out: 1736 __putname(de); 1737 return err; 1738 } 1739 1740 /* 1741 * ntfs_unlink_inode 1742 * 1743 * inode_operations::unlink 1744 * inode_operations::rmdir 1745 */ 1746 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1747 { 1748 int err; 1749 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1750 struct inode *inode = d_inode(dentry); 1751 struct ntfs_inode *ni = ntfs_i(inode); 1752 struct ntfs_inode *dir_ni = ntfs_i(dir); 1753 struct NTFS_DE *de, *de2 = NULL; 1754 int undo_remove; 1755 1756 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1757 return -EINVAL; 1758 1759 /* Allocate PATH_MAX bytes. */ 1760 de = __getname(); 1761 if (!de) 1762 return -ENOMEM; 1763 1764 ni_lock(ni); 1765 1766 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1767 err = -ENOTEMPTY; 1768 goto out; 1769 } 1770 1771 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1772 if (err < 0) 1773 goto out; 1774 1775 undo_remove = 0; 1776 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1777 1778 if (!err) { 1779 drop_nlink(inode); 1780 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 1781 mark_inode_dirty(dir); 1782 inode_set_ctime_to_ts(inode, inode_get_ctime(dir)); 1783 if (inode->i_nlink) 1784 mark_inode_dirty(inode); 1785 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1786 _ntfs_bad_inode(inode); 1787 } else { 1788 if (ni_is_dirty(dir)) 1789 mark_inode_dirty(dir); 1790 if (ni_is_dirty(inode)) 1791 mark_inode_dirty(inode); 1792 } 1793 1794 out: 1795 ni_unlock(ni); 1796 __putname(de); 1797 return err; 1798 } 1799 1800 void ntfs_evict_inode(struct inode *inode) 1801 { 1802 truncate_inode_pages_final(&inode->i_data); 1803 1804 invalidate_inode_buffers(inode); 1805 clear_inode(inode); 1806 1807 ni_clear(ntfs_i(inode)); 1808 } 1809 1810 /* 1811 * ntfs_translate_junction 1812 * 1813 * Translate a Windows junction target to the Linux equivalent. 1814 * On junctions, targets are always absolute (they include the drive 1815 * letter). We have no way of knowing if the target is for the current 1816 * mounted device or not so we just assume it is. 1817 */ 1818 static int ntfs_translate_junction(const struct super_block *sb, 1819 const struct dentry *link_de, char *target, 1820 int target_len, int target_max) 1821 { 1822 int tl_len, err = target_len; 1823 char *link_path_buffer = NULL, *link_path; 1824 char *translated = NULL; 1825 char *target_start; 1826 int copy_len; 1827 1828 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); 1829 if (!link_path_buffer) { 1830 err = -ENOMEM; 1831 goto out; 1832 } 1833 /* Get link path, relative to mount point */ 1834 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); 1835 if (IS_ERR(link_path)) { 1836 ntfs_err(sb, "Error getting link path"); 1837 err = -EINVAL; 1838 goto out; 1839 } 1840 1841 translated = kmalloc(PATH_MAX, GFP_NOFS); 1842 if (!translated) { 1843 err = -ENOMEM; 1844 goto out; 1845 } 1846 1847 /* Make translated path a relative path to mount point */ 1848 strcpy(translated, "./"); 1849 ++link_path; /* Skip leading / */ 1850 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) { 1851 if (*link_path == '/') { 1852 if (PATH_MAX - tl_len < sizeof("../")) { 1853 ntfs_err(sb, 1854 "Link path %s has too many components", 1855 link_path); 1856 err = -EINVAL; 1857 goto out; 1858 } 1859 strcpy(translated + tl_len, "../"); 1860 tl_len += sizeof("../") - 1; 1861 } 1862 } 1863 1864 /* Skip drive letter */ 1865 target_start = target; 1866 while (*target_start && *target_start != ':') 1867 ++target_start; 1868 1869 if (!*target_start) { 1870 ntfs_err(sb, "Link target (%s) missing drive separator", 1871 target); 1872 err = -EINVAL; 1873 goto out; 1874 } 1875 1876 /* Skip drive separator and leading /, if exists */ 1877 target_start += 1 + (target_start[1] == '/'); 1878 copy_len = target_len - (target_start - target); 1879 1880 if (PATH_MAX - tl_len <= copy_len) { 1881 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)", 1882 target_start, PATH_MAX - tl_len, copy_len); 1883 err = -EINVAL; 1884 goto out; 1885 } 1886 1887 /* translated path has a trailing / and target_start does not */ 1888 strcpy(translated + tl_len, target_start); 1889 tl_len += copy_len; 1890 if (target_max <= tl_len) { 1891 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)", 1892 translated, target_max, tl_len); 1893 err = -EINVAL; 1894 goto out; 1895 } 1896 strcpy(target, translated); 1897 err = tl_len; 1898 1899 out: 1900 kfree(link_path_buffer); 1901 kfree(translated); 1902 return err; 1903 } 1904 1905 static noinline int ntfs_readlink_hlp(const struct dentry *link_de, 1906 struct inode *inode, char *buffer, 1907 int buflen) 1908 { 1909 int i, err = -EINVAL; 1910 struct ntfs_inode *ni = ntfs_i(inode); 1911 struct super_block *sb = inode->i_sb; 1912 struct ntfs_sb_info *sbi = sb->s_fs_info; 1913 u64 size; 1914 u16 ulen = 0; 1915 void *to_free = NULL; 1916 struct REPARSE_DATA_BUFFER *rp; 1917 const __le16 *uname; 1918 struct ATTRIB *attr; 1919 1920 /* Reparse data present. Try to parse it. */ 1921 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1922 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1923 1924 *buffer = 0; 1925 1926 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1927 if (!attr) 1928 goto out; 1929 1930 if (!attr->non_res) { 1931 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1932 if (!rp) 1933 goto out; 1934 size = le32_to_cpu(attr->res.data_size); 1935 } else { 1936 size = le64_to_cpu(attr->nres.data_size); 1937 rp = NULL; 1938 } 1939 1940 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1941 goto out; 1942 1943 if (!rp) { 1944 rp = kmalloc(size, GFP_NOFS); 1945 if (!rp) { 1946 err = -ENOMEM; 1947 goto out; 1948 } 1949 to_free = rp; 1950 /* Read into temporal buffer. */ 1951 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1952 if (err) 1953 goto out; 1954 } 1955 1956 /* Microsoft Tag. */ 1957 switch (rp->ReparseTag) { 1958 case IO_REPARSE_TAG_MOUNT_POINT: 1959 /* Mount points and junctions. */ 1960 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1961 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1962 MountPointReparseBuffer.PathBuffer)) 1963 goto out; 1964 uname = Add2Ptr(rp, 1965 offsetof(struct REPARSE_DATA_BUFFER, 1966 MountPointReparseBuffer.PathBuffer) + 1967 le16_to_cpu(rp->MountPointReparseBuffer 1968 .PrintNameOffset)); 1969 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1970 break; 1971 1972 case IO_REPARSE_TAG_SYMLINK: 1973 /* FolderSymbolicLink */ 1974 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1975 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1976 SymbolicLinkReparseBuffer.PathBuffer)) 1977 goto out; 1978 uname = Add2Ptr( 1979 rp, offsetof(struct REPARSE_DATA_BUFFER, 1980 SymbolicLinkReparseBuffer.PathBuffer) + 1981 le16_to_cpu(rp->SymbolicLinkReparseBuffer 1982 .PrintNameOffset)); 1983 ulen = le16_to_cpu( 1984 rp->SymbolicLinkReparseBuffer.PrintNameLength); 1985 break; 1986 1987 case IO_REPARSE_TAG_CLOUD: 1988 case IO_REPARSE_TAG_CLOUD_1: 1989 case IO_REPARSE_TAG_CLOUD_2: 1990 case IO_REPARSE_TAG_CLOUD_3: 1991 case IO_REPARSE_TAG_CLOUD_4: 1992 case IO_REPARSE_TAG_CLOUD_5: 1993 case IO_REPARSE_TAG_CLOUD_6: 1994 case IO_REPARSE_TAG_CLOUD_7: 1995 case IO_REPARSE_TAG_CLOUD_8: 1996 case IO_REPARSE_TAG_CLOUD_9: 1997 case IO_REPARSE_TAG_CLOUD_A: 1998 case IO_REPARSE_TAG_CLOUD_B: 1999 case IO_REPARSE_TAG_CLOUD_C: 2000 case IO_REPARSE_TAG_CLOUD_D: 2001 case IO_REPARSE_TAG_CLOUD_E: 2002 case IO_REPARSE_TAG_CLOUD_F: 2003 err = sizeof("OneDrive") - 1; 2004 if (err > buflen) 2005 err = buflen; 2006 memcpy(buffer, "OneDrive", err); 2007 goto out; 2008 2009 default: 2010 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 2011 /* Unknown Microsoft Tag. */ 2012 goto out; 2013 } 2014 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 2015 size <= sizeof(struct REPARSE_POINT)) { 2016 goto out; 2017 } 2018 2019 /* Users tag. */ 2020 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 2021 ulen = le16_to_cpu(rp->ReparseDataLength) - 2022 sizeof(struct REPARSE_POINT); 2023 } 2024 2025 /* Convert nlen from bytes to UNICODE chars. */ 2026 ulen >>= 1; 2027 2028 /* Check that name is available. */ 2029 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 2030 goto out; 2031 2032 /* If name is already zero terminated then truncate it now. */ 2033 if (!uname[ulen - 1]) 2034 ulen -= 1; 2035 2036 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 2037 2038 if (err < 0) 2039 goto out; 2040 2041 /* Translate Windows '\' into Linux '/'. */ 2042 for (i = 0; i < err; i++) { 2043 if (buffer[i] == '\\') 2044 buffer[i] = '/'; 2045 } 2046 2047 /* Always set last zero. */ 2048 buffer[err] = 0; 2049 2050 /* If this is a junction, translate the link target. */ 2051 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) 2052 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen); 2053 2054 out: 2055 kfree(to_free); 2056 return err; 2057 } 2058 2059 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 2060 struct delayed_call *done) 2061 { 2062 int err; 2063 char *ret; 2064 2065 if (!de) 2066 return ERR_PTR(-ECHILD); 2067 2068 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 2069 if (!ret) 2070 return ERR_PTR(-ENOMEM); 2071 2072 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE); 2073 if (err < 0) { 2074 kfree(ret); 2075 return ERR_PTR(err); 2076 } 2077 2078 set_delayed_call(done, kfree_link, ret); 2079 2080 return ret; 2081 } 2082 2083 // clang-format off 2084 const struct inode_operations ntfs_link_inode_operations = { 2085 .get_link = ntfs_get_link, 2086 .setattr = ntfs_setattr, 2087 .listxattr = ntfs_listxattr, 2088 }; 2089 2090 const struct address_space_operations ntfs_aops = { 2091 .read_folio = ntfs_read_folio, 2092 .readahead = ntfs_readahead, 2093 .writepages = ntfs_writepages, 2094 .write_begin = ntfs_write_begin, 2095 .write_end = ntfs_write_end, 2096 .direct_IO = ntfs_direct_IO, 2097 .bmap = ntfs_bmap, 2098 .dirty_folio = block_dirty_folio, 2099 .migrate_folio = buffer_migrate_folio, 2100 .invalidate_folio = block_invalidate_folio, 2101 }; 2102 2103 const struct address_space_operations ntfs_aops_cmpr = { 2104 .read_folio = ntfs_read_folio, 2105 .readahead = ntfs_readahead, 2106 .dirty_folio = block_dirty_folio, 2107 .direct_IO = ntfs_direct_IO, 2108 }; 2109 // clang-format on 2110