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