1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 */ 7 8 #include <linux/buffer_head.h> 9 #include <linux/fs.h> 10 #include <linux/mpage.h> 11 #include <linux/namei.h> 12 #include <linux/nls.h> 13 #include <linux/uio.h> 14 #include <linux/writeback.h> 15 16 #include "debug.h" 17 #include "ntfs.h" 18 #include "ntfs_fs.h" 19 20 /* 21 * ntfs_read_mft - Read record and parses MFT. 22 */ 23 static struct inode *ntfs_read_mft(struct inode *inode, 24 const struct cpu_str *name, 25 const struct MFT_REF *ref) 26 { 27 int err = 0; 28 struct ntfs_inode *ni = ntfs_i(inode); 29 struct super_block *sb = inode->i_sb; 30 struct ntfs_sb_info *sbi = sb->s_fs_info; 31 mode_t mode = 0; 32 struct ATTR_STD_INFO5 *std5 = NULL; 33 struct ATTR_LIST_ENTRY *le; 34 struct ATTRIB *attr; 35 bool is_match = false; 36 bool is_root = false; 37 bool is_dir; 38 unsigned long ino = inode->i_ino; 39 u32 rp_fa = 0, asize, t32; 40 u16 roff, rsize, names = 0, links = 0; 41 const struct ATTR_FILE_NAME *fname = NULL; 42 const struct INDEX_ROOT *root; 43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes 44 u64 t64; 45 struct MFT_REC *rec; 46 struct runs_tree *run; 47 struct timespec64 ctime; 48 49 inode->i_op = NULL; 50 /* Setup 'uid' and 'gid' */ 51 inode->i_uid = sbi->options->fs_uid; 52 inode->i_gid = sbi->options->fs_gid; 53 54 err = mi_init(&ni->mi, sbi, ino); 55 if (err) 56 goto out; 57 58 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) { 59 t64 = sbi->mft.lbo >> sbi->cluster_bits; 60 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size); 61 sbi->mft.ni = ni; 62 init_rwsem(&ni->file.run_lock); 63 64 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) { 65 err = -ENOMEM; 66 goto out; 67 } 68 } 69 70 err = mi_read(&ni->mi, ino == MFT_REC_MFT); 71 72 if (err) 73 goto out; 74 75 rec = ni->mi.mrec; 76 77 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) { 78 ; 79 } else if (ref->seq != rec->seq) { 80 err = -EINVAL; 81 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino, 82 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq)); 83 goto out; 84 } else if (!is_rec_inuse(rec)) { 85 err = -ESTALE; 86 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino); 87 goto out; 88 } 89 90 if (le32_to_cpu(rec->total) != sbi->record_size) { 91 /* Bad inode? */ 92 err = -EINVAL; 93 goto out; 94 } 95 96 if (!is_rec_base(rec)) { 97 err = -EINVAL; 98 goto out; 99 } 100 101 /* Record should contain $I30 root. */ 102 is_dir = rec->flags & RECORD_FLAG_DIR; 103 104 /* MFT_REC_MFT is not a dir */ 105 if (is_dir && ino == MFT_REC_MFT) { 106 err = -EINVAL; 107 goto out; 108 } 109 110 inode->i_generation = le16_to_cpu(rec->seq); 111 112 /* Enumerate all struct Attributes MFT. */ 113 le = NULL; 114 attr = NULL; 115 116 /* 117 * To reduce tab pressure use goto instead of 118 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) )) 119 */ 120 next_attr: 121 run = NULL; 122 err = -EINVAL; 123 attr = ni_enum_attr_ex(ni, attr, &le, NULL); 124 if (!attr) 125 goto end_enum; 126 127 if (le && le->vcn) { 128 /* This is non primary attribute segment. Ignore if not MFT. */ 129 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA) 130 goto next_attr; 131 132 run = &ni->file.run; 133 asize = le32_to_cpu(attr->size); 134 goto attr_unpack_run; 135 } 136 137 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off); 138 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size); 139 asize = le32_to_cpu(attr->size); 140 141 /* 142 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'. 143 * There not critical to check this case again 144 */ 145 if (attr->name_len && 146 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) > 147 asize) 148 goto out; 149 150 if (attr->non_res) { 151 t64 = le64_to_cpu(attr->nres.alloc_size); 152 if (le64_to_cpu(attr->nres.data_size) > t64 || 153 le64_to_cpu(attr->nres.valid_size) > t64) 154 goto out; 155 } 156 157 switch (attr->type) { 158 case ATTR_STD: 159 if (attr->non_res || 160 asize < sizeof(struct ATTR_STD_INFO) + roff || 161 rsize < sizeof(struct ATTR_STD_INFO)) 162 goto out; 163 164 if (std5) 165 goto next_attr; 166 167 std5 = Add2Ptr(attr, roff); 168 169 #ifdef STATX_BTIME 170 nt2kernel(std5->cr_time, &ni->i_crtime); 171 #endif 172 nt2kernel(std5->a_time, &inode->i_atime); 173 nt2kernel(std5->c_time, &ctime); 174 inode_set_ctime_to_ts(inode, ctime); 175 nt2kernel(std5->m_time, &inode->i_mtime); 176 177 ni->std_fa = std5->fa; 178 179 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && 180 rsize >= sizeof(struct ATTR_STD_INFO5)) 181 ni->std_security_id = std5->security_id; 182 goto next_attr; 183 184 case ATTR_LIST: 185 if (attr->name_len || le || ino == MFT_REC_LOG) 186 goto out; 187 188 err = ntfs_load_attr_list(ni, attr); 189 if (err) 190 goto out; 191 192 le = NULL; 193 attr = NULL; 194 goto next_attr; 195 196 case ATTR_NAME: 197 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || 198 rsize < SIZEOF_ATTRIBUTE_FILENAME) 199 goto out; 200 201 names += 1; 202 fname = Add2Ptr(attr, roff); 203 if (fname->type == FILE_NAME_DOS) 204 goto next_attr; 205 206 links += 1; 207 if (name && name->len == fname->name_len && 208 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, 209 NULL, false)) 210 is_match = true; 211 212 goto next_attr; 213 214 case ATTR_DATA: 215 if (is_dir) { 216 /* Ignore data attribute in dir record. */ 217 goto next_attr; 218 } 219 220 if (ino == MFT_REC_BADCLUST && !attr->non_res) 221 goto next_attr; 222 223 if (attr->name_len && 224 ((ino != MFT_REC_BADCLUST || !attr->non_res || 225 attr->name_len != ARRAY_SIZE(BAD_NAME) || 226 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && 227 (ino != MFT_REC_SECURE || !attr->non_res || 228 attr->name_len != ARRAY_SIZE(SDS_NAME) || 229 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { 230 /* File contains stream attribute. Ignore it. */ 231 goto next_attr; 232 } 233 234 if (is_attr_sparsed(attr)) 235 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; 236 else 237 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; 238 239 if (is_attr_compressed(attr)) 240 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; 241 else 242 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; 243 244 if (is_attr_encrypted(attr)) 245 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; 246 else 247 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; 248 249 if (!attr->non_res) { 250 ni->i_valid = inode->i_size = rsize; 251 inode_set_bytes(inode, rsize); 252 } 253 254 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); 255 256 if (!attr->non_res) { 257 ni->ni_flags |= NI_FLAG_RESIDENT; 258 goto next_attr; 259 } 260 261 inode_set_bytes(inode, attr_ondisk_size(attr)); 262 263 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 264 inode->i_size = le64_to_cpu(attr->nres.data_size); 265 if (!attr->nres.alloc_size) 266 goto next_attr; 267 268 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run : 269 &ni->file.run; 270 break; 271 272 case ATTR_ROOT: 273 if (attr->non_res) 274 goto out; 275 276 root = Add2Ptr(attr, roff); 277 278 if (attr->name_len != ARRAY_SIZE(I30_NAME) || 279 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 280 goto next_attr; 281 282 if (root->type != ATTR_NAME || 283 root->rule != NTFS_COLLATION_TYPE_FILENAME) 284 goto out; 285 286 if (!is_dir) 287 goto next_attr; 288 289 is_root = true; 290 ni->ni_flags |= NI_FLAG_DIR; 291 292 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 293 if (err) 294 goto out; 295 296 mode = sb->s_root ? 297 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) : 298 (S_IFDIR | 0777); 299 goto next_attr; 300 301 case ATTR_ALLOC: 302 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || 303 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 304 goto next_attr; 305 306 inode->i_size = le64_to_cpu(attr->nres.data_size); 307 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 308 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); 309 310 run = &ni->dir.alloc_run; 311 break; 312 313 case ATTR_BITMAP: 314 if (ino == MFT_REC_MFT) { 315 if (!attr->non_res) 316 goto out; 317 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 318 /* 0x20000000 = 2^32 / 8 */ 319 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) 320 goto out; 321 #endif 322 run = &sbi->mft.bitmap.run; 323 break; 324 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && 325 !memcmp(attr_name(attr), I30_NAME, 326 sizeof(I30_NAME)) && 327 attr->non_res) { 328 run = &ni->dir.bitmap_run; 329 break; 330 } 331 goto next_attr; 332 333 case ATTR_REPARSE: 334 if (attr->name_len) 335 goto next_attr; 336 337 rp_fa = ni_parse_reparse(ni, attr, &rp); 338 switch (rp_fa) { 339 case REPARSE_LINK: 340 /* 341 * Normal symlink. 342 * Assume one unicode symbol == one utf8. 343 */ 344 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer 345 .PrintNameLength) / 346 sizeof(u16); 347 348 ni->i_valid = inode->i_size; 349 350 /* Clear directory bit. */ 351 if (ni->ni_flags & NI_FLAG_DIR) { 352 indx_clear(&ni->dir); 353 memset(&ni->dir, 0, sizeof(ni->dir)); 354 ni->ni_flags &= ~NI_FLAG_DIR; 355 } else { 356 run_close(&ni->file.run); 357 } 358 mode = S_IFLNK | 0777; 359 is_dir = false; 360 if (attr->non_res) { 361 run = &ni->file.run; 362 goto attr_unpack_run; // Double break. 363 } 364 break; 365 366 case REPARSE_COMPRESSED: 367 break; 368 369 case REPARSE_DEDUPLICATED: 370 break; 371 } 372 goto next_attr; 373 374 case ATTR_EA_INFO: 375 if (!attr->name_len && 376 resident_data_ex(attr, sizeof(struct EA_INFO))) { 377 ni->ni_flags |= NI_FLAG_EA; 378 /* 379 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode 380 */ 381 inode->i_mode = mode; 382 ntfs_get_wsl_perm(inode); 383 mode = inode->i_mode; 384 } 385 goto next_attr; 386 387 default: 388 goto next_attr; 389 } 390 391 attr_unpack_run: 392 roff = le16_to_cpu(attr->nres.run_off); 393 394 if (roff > asize) { 395 err = -EINVAL; 396 goto out; 397 } 398 399 t64 = le64_to_cpu(attr->nres.svcn); 400 401 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), 402 t64, Add2Ptr(attr, roff), asize - roff); 403 if (err < 0) 404 goto out; 405 err = 0; 406 goto next_attr; 407 408 end_enum: 409 410 if (!std5) 411 goto out; 412 413 if (!is_match && name) { 414 err = -ENOENT; 415 goto out; 416 } 417 418 if (std5->fa & FILE_ATTRIBUTE_READONLY) 419 mode &= ~0222; 420 421 if (!names) { 422 err = -EINVAL; 423 goto out; 424 } 425 426 if (names != le16_to_cpu(rec->hard_links)) { 427 /* Correct minor error on the fly. Do not mark inode as dirty. */ 428 ntfs_inode_warn(inode, "Correct links count -> %u.", names); 429 rec->hard_links = cpu_to_le16(names); 430 ni->mi.dirty = true; 431 } 432 433 set_nlink(inode, links); 434 435 if (S_ISDIR(mode)) { 436 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; 437 438 /* 439 * Dot and dot-dot should be included in count but was not 440 * included in enumeration. 441 * Usually a hard links to directories are disabled. 442 */ 443 inode->i_op = &ntfs_dir_inode_operations; 444 inode->i_fop = &ntfs_dir_operations; 445 ni->i_valid = 0; 446 } else if (S_ISLNK(mode)) { 447 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 448 inode->i_op = &ntfs_link_inode_operations; 449 inode->i_fop = NULL; 450 inode_nohighmem(inode); 451 } else if (S_ISREG(mode)) { 452 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 453 inode->i_op = &ntfs_file_inode_operations; 454 inode->i_fop = &ntfs_file_operations; 455 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 456 &ntfs_aops; 457 if (ino != MFT_REC_MFT) 458 init_rwsem(&ni->file.run_lock); 459 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || 460 S_ISSOCK(mode)) { 461 inode->i_op = &ntfs_special_inode_operations; 462 init_special_inode(inode, mode, inode->i_rdev); 463 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && 464 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { 465 /* Records in $Extend are not a files or general directories. */ 466 inode->i_op = &ntfs_file_inode_operations; 467 } else { 468 err = -EINVAL; 469 goto out; 470 } 471 472 if ((sbi->options->sys_immutable && 473 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 474 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 475 inode->i_flags |= S_IMMUTABLE; 476 } else { 477 inode->i_flags &= ~S_IMMUTABLE; 478 } 479 480 inode->i_mode = mode; 481 if (!(ni->ni_flags & NI_FLAG_EA)) { 482 /* If no xattr then no security (stored in xattr). */ 483 inode->i_flags |= S_NOSEC; 484 } 485 486 if (ino == MFT_REC_MFT && !sb->s_root) 487 sbi->mft.ni = NULL; 488 489 unlock_new_inode(inode); 490 491 return inode; 492 493 out: 494 if (ino == MFT_REC_MFT && !sb->s_root) 495 sbi->mft.ni = NULL; 496 497 iget_failed(inode); 498 return ERR_PTR(err); 499 } 500 501 /* 502 * ntfs_test_inode 503 * 504 * Return: 1 if match. 505 */ 506 static int ntfs_test_inode(struct inode *inode, void *data) 507 { 508 struct MFT_REF *ref = data; 509 510 return ino_get(ref) == inode->i_ino; 511 } 512 513 static int ntfs_set_inode(struct inode *inode, void *data) 514 { 515 const struct MFT_REF *ref = data; 516 517 inode->i_ino = ino_get(ref); 518 return 0; 519 } 520 521 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 522 const struct cpu_str *name) 523 { 524 struct inode *inode; 525 526 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 527 (void *)ref); 528 if (unlikely(!inode)) 529 return ERR_PTR(-ENOMEM); 530 531 /* If this is a freshly allocated inode, need to read it now. */ 532 if (inode->i_state & I_NEW) 533 inode = ntfs_read_mft(inode, name, ref); 534 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 535 /* Inode overlaps? */ 536 _ntfs_bad_inode(inode); 537 } 538 539 if (IS_ERR(inode) && name) 540 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR); 541 542 return inode; 543 } 544 545 enum get_block_ctx { 546 GET_BLOCK_GENERAL = 0, 547 GET_BLOCK_WRITE_BEGIN = 1, 548 GET_BLOCK_DIRECT_IO_R = 2, 549 GET_BLOCK_DIRECT_IO_W = 3, 550 GET_BLOCK_BMAP = 4, 551 }; 552 553 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 554 struct buffer_head *bh, int create, 555 enum get_block_ctx ctx) 556 { 557 struct super_block *sb = inode->i_sb; 558 struct ntfs_sb_info *sbi = sb->s_fs_info; 559 struct ntfs_inode *ni = ntfs_i(inode); 560 struct folio *folio = bh->b_folio; 561 u8 cluster_bits = sbi->cluster_bits; 562 u32 block_size = sb->s_blocksize; 563 u64 bytes, lbo, valid; 564 u32 off; 565 int err; 566 CLST vcn, lcn, len; 567 bool new; 568 569 /* Clear previous state. */ 570 clear_buffer_new(bh); 571 clear_buffer_uptodate(bh); 572 573 if (is_resident(ni)) { 574 bh->b_blocknr = RESIDENT_LCN; 575 bh->b_size = block_size; 576 if (!folio) { 577 err = 0; 578 } else { 579 ni_lock(ni); 580 err = attr_data_read_resident(ni, &folio->page); 581 ni_unlock(ni); 582 583 if (!err) 584 set_buffer_uptodate(bh); 585 } 586 return err; 587 } 588 589 vcn = vbo >> cluster_bits; 590 off = vbo & sbi->cluster_mask; 591 new = false; 592 593 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL, 594 create && sbi->cluster_size > PAGE_SIZE); 595 if (err) 596 goto out; 597 598 if (!len) 599 return 0; 600 601 bytes = ((u64)len << cluster_bits) - off; 602 603 if (lcn == SPARSE_LCN) { 604 if (!create) { 605 if (bh->b_size > bytes) 606 bh->b_size = bytes; 607 return 0; 608 } 609 WARN_ON(1); 610 } 611 612 if (new) 613 set_buffer_new(bh); 614 615 lbo = ((u64)lcn << cluster_bits) + off; 616 617 set_buffer_mapped(bh); 618 bh->b_bdev = sb->s_bdev; 619 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 620 621 valid = ni->i_valid; 622 623 if (ctx == GET_BLOCK_DIRECT_IO_W) { 624 /* ntfs_direct_IO will update ni->i_valid. */ 625 if (vbo >= valid) 626 set_buffer_new(bh); 627 } else if (create) { 628 /* Normal write. */ 629 if (bytes > bh->b_size) 630 bytes = bh->b_size; 631 632 if (vbo >= valid) 633 set_buffer_new(bh); 634 635 if (vbo + bytes > valid) { 636 ni->i_valid = vbo + bytes; 637 mark_inode_dirty(inode); 638 } 639 } else if (vbo >= valid) { 640 /* Read out of valid data. */ 641 clear_buffer_mapped(bh); 642 } else if (vbo + bytes <= valid) { 643 /* Normal read. */ 644 } else if (vbo + block_size <= valid) { 645 /* Normal short read. */ 646 bytes = block_size; 647 } else { 648 /* 649 * Read across valid size: vbo < valid && valid < vbo + block_size 650 */ 651 bytes = block_size; 652 653 if (folio) { 654 u32 voff = valid - vbo; 655 656 bh->b_size = block_size; 657 off = vbo & (PAGE_SIZE - 1); 658 folio_set_bh(bh, folio, off); 659 660 err = bh_read(bh, 0); 661 if (err < 0) 662 goto out; 663 folio_zero_segment(folio, off + voff, off + block_size); 664 } 665 } 666 667 if (bh->b_size > bytes) 668 bh->b_size = bytes; 669 670 #ifndef __LP64__ 671 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 672 static_assert(sizeof(size_t) < sizeof(loff_t)); 673 if (bytes > 0x40000000u) 674 bh->b_size = 0x40000000u; 675 } 676 #endif 677 678 return 0; 679 680 out: 681 return err; 682 } 683 684 int ntfs_get_block(struct inode *inode, sector_t vbn, 685 struct buffer_head *bh_result, int create) 686 { 687 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 688 bh_result, create, GET_BLOCK_GENERAL); 689 } 690 691 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 692 struct buffer_head *bh_result, int create) 693 { 694 return ntfs_get_block_vbo(inode, 695 (u64)vsn << inode->i_sb->s_blocksize_bits, 696 bh_result, create, GET_BLOCK_BMAP); 697 } 698 699 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 700 { 701 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 702 } 703 704 static int ntfs_read_folio(struct file *file, struct folio *folio) 705 { 706 struct page *page = &folio->page; 707 int err; 708 struct address_space *mapping = page->mapping; 709 struct inode *inode = mapping->host; 710 struct ntfs_inode *ni = ntfs_i(inode); 711 712 if (is_resident(ni)) { 713 ni_lock(ni); 714 err = attr_data_read_resident(ni, page); 715 ni_unlock(ni); 716 if (err != E_NTFS_NONRESIDENT) { 717 unlock_page(page); 718 return err; 719 } 720 } 721 722 if (is_compressed(ni)) { 723 ni_lock(ni); 724 err = ni_readpage_cmpr(ni, page); 725 ni_unlock(ni); 726 return err; 727 } 728 729 /* Normal + sparse files. */ 730 return mpage_read_folio(folio, ntfs_get_block); 731 } 732 733 static void ntfs_readahead(struct readahead_control *rac) 734 { 735 struct address_space *mapping = rac->mapping; 736 struct inode *inode = mapping->host; 737 struct ntfs_inode *ni = ntfs_i(inode); 738 u64 valid; 739 loff_t pos; 740 741 if (is_resident(ni)) { 742 /* No readahead for resident. */ 743 return; 744 } 745 746 if (is_compressed(ni)) { 747 /* No readahead for compressed. */ 748 return; 749 } 750 751 valid = ni->i_valid; 752 pos = readahead_pos(rac); 753 754 if (valid < i_size_read(inode) && pos <= valid && 755 valid < pos + readahead_length(rac)) { 756 /* Range cross 'valid'. Read it page by page. */ 757 return; 758 } 759 760 mpage_readahead(rac, ntfs_get_block); 761 } 762 763 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 764 struct buffer_head *bh_result, int create) 765 { 766 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 767 bh_result, create, GET_BLOCK_DIRECT_IO_R); 768 } 769 770 static int ntfs_get_block_direct_IO_W(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_W); 775 } 776 777 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 778 { 779 struct file *file = iocb->ki_filp; 780 struct address_space *mapping = file->f_mapping; 781 struct inode *inode = mapping->host; 782 struct ntfs_inode *ni = ntfs_i(inode); 783 loff_t vbo = iocb->ki_pos; 784 loff_t end; 785 int wr = iov_iter_rw(iter) & WRITE; 786 size_t iter_count = iov_iter_count(iter); 787 loff_t valid; 788 ssize_t ret; 789 790 if (is_resident(ni)) { 791 /* Switch to buffered write. */ 792 ret = 0; 793 goto out; 794 } 795 796 ret = blockdev_direct_IO(iocb, inode, iter, 797 wr ? ntfs_get_block_direct_IO_W : 798 ntfs_get_block_direct_IO_R); 799 800 if (ret > 0) 801 end = vbo + ret; 802 else if (wr && ret == -EIOCBQUEUED) 803 end = vbo + iter_count; 804 else 805 goto out; 806 807 valid = ni->i_valid; 808 if (wr) { 809 if (end > valid && !S_ISBLK(inode->i_mode)) { 810 ni->i_valid = end; 811 mark_inode_dirty(inode); 812 } 813 } else if (vbo < valid && valid < end) { 814 /* Fix page. */ 815 iov_iter_revert(iter, end - valid); 816 iov_iter_zero(end - valid, iter); 817 } 818 819 out: 820 return ret; 821 } 822 823 int ntfs_set_size(struct inode *inode, u64 new_size) 824 { 825 struct super_block *sb = inode->i_sb; 826 struct ntfs_sb_info *sbi = sb->s_fs_info; 827 struct ntfs_inode *ni = ntfs_i(inode); 828 int err; 829 830 /* Check for maximum file size. */ 831 if (is_sparsed(ni) || is_compressed(ni)) { 832 if (new_size > sbi->maxbytes_sparse) { 833 err = -EFBIG; 834 goto out; 835 } 836 } else if (new_size > sbi->maxbytes) { 837 err = -EFBIG; 838 goto out; 839 } 840 841 ni_lock(ni); 842 down_write(&ni->file.run_lock); 843 844 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 845 &ni->i_valid, true, NULL); 846 847 up_write(&ni->file.run_lock); 848 ni_unlock(ni); 849 850 mark_inode_dirty(inode); 851 852 out: 853 return err; 854 } 855 856 static int ntfs_resident_writepage(struct folio *folio, 857 struct writeback_control *wbc, void *data) 858 { 859 struct address_space *mapping = data; 860 struct inode *inode = mapping->host; 861 struct ntfs_inode *ni = ntfs_i(inode); 862 int ret; 863 864 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 865 return -EIO; 866 867 ni_lock(ni); 868 ret = attr_data_write_resident(ni, &folio->page); 869 ni_unlock(ni); 870 871 if (ret != E_NTFS_NONRESIDENT) 872 folio_unlock(folio); 873 mapping_set_error(mapping, ret); 874 return ret; 875 } 876 877 static int ntfs_writepages(struct address_space *mapping, 878 struct writeback_control *wbc) 879 { 880 struct inode *inode = mapping->host; 881 882 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 883 return -EIO; 884 885 if (is_resident(ntfs_i(inode))) 886 return write_cache_pages(mapping, wbc, ntfs_resident_writepage, 887 mapping); 888 return mpage_writepages(mapping, wbc, ntfs_get_block); 889 } 890 891 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 892 struct buffer_head *bh_result, int create) 893 { 894 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 895 bh_result, create, GET_BLOCK_WRITE_BEGIN); 896 } 897 898 int ntfs_write_begin(struct file *file, struct address_space *mapping, 899 loff_t pos, u32 len, struct page **pagep, void **fsdata) 900 { 901 int err; 902 struct inode *inode = mapping->host; 903 struct ntfs_inode *ni = ntfs_i(inode); 904 905 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 906 return -EIO; 907 908 *pagep = NULL; 909 if (is_resident(ni)) { 910 struct page *page = 911 grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT); 912 913 if (!page) { 914 err = -ENOMEM; 915 goto out; 916 } 917 918 ni_lock(ni); 919 err = attr_data_read_resident(ni, page); 920 ni_unlock(ni); 921 922 if (!err) { 923 *pagep = page; 924 goto out; 925 } 926 unlock_page(page); 927 put_page(page); 928 929 if (err != E_NTFS_NONRESIDENT) 930 goto out; 931 } 932 933 err = block_write_begin(mapping, pos, len, pagep, 934 ntfs_get_block_write_begin); 935 936 out: 937 return err; 938 } 939 940 /* 941 * ntfs_write_end - Address_space_operations::write_end. 942 */ 943 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, 944 u32 len, u32 copied, struct page *page, void *fsdata) 945 { 946 struct inode *inode = mapping->host; 947 struct ntfs_inode *ni = ntfs_i(inode); 948 u64 valid = ni->i_valid; 949 bool dirty = false; 950 int err; 951 952 if (is_resident(ni)) { 953 ni_lock(ni); 954 err = attr_data_write_resident(ni, page); 955 ni_unlock(ni); 956 if (!err) { 957 dirty = true; 958 /* Clear any buffers in page. */ 959 if (page_has_buffers(page)) { 960 struct buffer_head *head, *bh; 961 962 bh = head = page_buffers(page); 963 do { 964 clear_buffer_dirty(bh); 965 clear_buffer_mapped(bh); 966 set_buffer_uptodate(bh); 967 } while (head != (bh = bh->b_this_page)); 968 } 969 SetPageUptodate(page); 970 err = copied; 971 } 972 unlock_page(page); 973 put_page(page); 974 } else { 975 err = generic_write_end(file, mapping, pos, len, copied, page, 976 fsdata); 977 } 978 979 if (err >= 0) { 980 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 981 inode->i_mtime = inode_set_ctime_current(inode); 982 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 983 dirty = true; 984 } 985 986 if (valid != ni->i_valid) { 987 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 988 dirty = true; 989 } 990 991 if (pos + err > inode->i_size) { 992 i_size_write(inode, pos + err); 993 dirty = true; 994 } 995 996 if (dirty) 997 mark_inode_dirty(inode); 998 } 999 1000 return err; 1001 } 1002 1003 int reset_log_file(struct inode *inode) 1004 { 1005 int err; 1006 loff_t pos = 0; 1007 u32 log_size = inode->i_size; 1008 struct address_space *mapping = inode->i_mapping; 1009 1010 for (;;) { 1011 u32 len; 1012 void *kaddr; 1013 struct page *page; 1014 1015 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 1016 1017 err = block_write_begin(mapping, pos, len, &page, 1018 ntfs_get_block_write_begin); 1019 if (err) 1020 goto out; 1021 1022 kaddr = kmap_atomic(page); 1023 memset(kaddr, -1, len); 1024 kunmap_atomic(kaddr); 1025 flush_dcache_page(page); 1026 1027 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 1028 if (err < 0) 1029 goto out; 1030 pos += len; 1031 1032 if (pos >= log_size) 1033 break; 1034 balance_dirty_pages_ratelimited(mapping); 1035 } 1036 out: 1037 mark_inode_dirty_sync(inode); 1038 1039 return err; 1040 } 1041 1042 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1043 { 1044 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1045 } 1046 1047 int ntfs_sync_inode(struct inode *inode) 1048 { 1049 return _ni_write_inode(inode, 1); 1050 } 1051 1052 /* 1053 * writeback_inode - Helper function for ntfs_flush_inodes(). 1054 * 1055 * This writes both the inode and the file data blocks, waiting 1056 * for in flight data blocks before the start of the call. It 1057 * does not wait for any io started during the call. 1058 */ 1059 static int writeback_inode(struct inode *inode) 1060 { 1061 int ret = sync_inode_metadata(inode, 0); 1062 1063 if (!ret) 1064 ret = filemap_fdatawrite(inode->i_mapping); 1065 return ret; 1066 } 1067 1068 /* 1069 * ntfs_flush_inodes 1070 * 1071 * Write data and metadata corresponding to i1 and i2. The io is 1072 * started but we do not wait for any of it to finish. 1073 * 1074 * filemap_flush() is used for the block device, so if there is a dirty 1075 * page for a block already in flight, we will not wait and start the 1076 * io over again. 1077 */ 1078 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1079 struct inode *i2) 1080 { 1081 int ret = 0; 1082 1083 if (i1) 1084 ret = writeback_inode(i1); 1085 if (!ret && i2) 1086 ret = writeback_inode(i2); 1087 if (!ret) 1088 ret = sync_blockdev_nowait(sb->s_bdev); 1089 return ret; 1090 } 1091 1092 int inode_write_data(struct inode *inode, const void *data, size_t bytes) 1093 { 1094 pgoff_t idx; 1095 1096 /* Write non resident data. */ 1097 for (idx = 0; bytes; idx++) { 1098 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1099 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1100 1101 if (IS_ERR(page)) 1102 return PTR_ERR(page); 1103 1104 lock_page(page); 1105 WARN_ON(!PageUptodate(page)); 1106 ClearPageUptodate(page); 1107 1108 memcpy(page_address(page), data, op); 1109 1110 flush_dcache_page(page); 1111 SetPageUptodate(page); 1112 unlock_page(page); 1113 1114 ntfs_unmap_page(page); 1115 1116 bytes -= op; 1117 data = Add2Ptr(data, PAGE_SIZE); 1118 } 1119 return 0; 1120 } 1121 1122 /* 1123 * ntfs_reparse_bytes 1124 * 1125 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1126 * for unicode string of @uni_len length. 1127 */ 1128 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1129 { 1130 /* Header + unicode string + decorated unicode string. */ 1131 return sizeof(short) * (2 * uni_len + 4) + 1132 offsetof(struct REPARSE_DATA_BUFFER, 1133 SymbolicLinkReparseBuffer.PathBuffer); 1134 } 1135 1136 static struct REPARSE_DATA_BUFFER * 1137 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1138 u32 size, u16 *nsize) 1139 { 1140 int i, err; 1141 struct REPARSE_DATA_BUFFER *rp; 1142 __le16 *rp_name; 1143 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1144 1145 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1146 if (!rp) 1147 return ERR_PTR(-ENOMEM); 1148 1149 rs = &rp->SymbolicLinkReparseBuffer; 1150 rp_name = rs->PathBuffer; 1151 1152 /* Convert link name to UTF-16. */ 1153 err = ntfs_nls_to_utf16(sbi, symname, size, 1154 (struct cpu_str *)(rp_name - 1), 2 * size, 1155 UTF16_LITTLE_ENDIAN); 1156 if (err < 0) 1157 goto out; 1158 1159 /* err = the length of unicode name of symlink. */ 1160 *nsize = ntfs_reparse_bytes(err); 1161 1162 if (*nsize > sbi->reparse.max_size) { 1163 err = -EFBIG; 1164 goto out; 1165 } 1166 1167 /* Translate Linux '/' into Windows '\'. */ 1168 for (i = 0; i < err; i++) { 1169 if (rp_name[i] == cpu_to_le16('/')) 1170 rp_name[i] = cpu_to_le16('\\'); 1171 } 1172 1173 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1174 rp->ReparseDataLength = 1175 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1176 SymbolicLinkReparseBuffer)); 1177 1178 /* PrintName + SubstituteName. */ 1179 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1180 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1181 rs->PrintNameLength = rs->SubstituteNameOffset; 1182 1183 /* 1184 * TODO: Use relative path if possible to allow Windows to 1185 * parse this path. 1186 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1187 */ 1188 rs->Flags = 0; 1189 1190 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1191 1192 /* Decorate SubstituteName. */ 1193 rp_name += err; 1194 rp_name[0] = cpu_to_le16('\\'); 1195 rp_name[1] = cpu_to_le16('?'); 1196 rp_name[2] = cpu_to_le16('?'); 1197 rp_name[3] = cpu_to_le16('\\'); 1198 1199 return rp; 1200 out: 1201 kfree(rp); 1202 return ERR_PTR(err); 1203 } 1204 1205 /* 1206 * ntfs_create_inode 1207 * 1208 * Helper function for: 1209 * - ntfs_create 1210 * - ntfs_mknod 1211 * - ntfs_symlink 1212 * - ntfs_mkdir 1213 * - ntfs_atomic_open 1214 * 1215 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked 1216 */ 1217 struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, 1218 struct dentry *dentry, 1219 const struct cpu_str *uni, umode_t mode, 1220 dev_t dev, const char *symname, u32 size, 1221 struct ntfs_fnd *fnd) 1222 { 1223 int err; 1224 struct super_block *sb = dir->i_sb; 1225 struct ntfs_sb_info *sbi = sb->s_fs_info; 1226 const struct qstr *name = &dentry->d_name; 1227 CLST ino = 0; 1228 struct ntfs_inode *dir_ni = ntfs_i(dir); 1229 struct ntfs_inode *ni = NULL; 1230 struct inode *inode = NULL; 1231 struct ATTRIB *attr; 1232 struct ATTR_STD_INFO5 *std5; 1233 struct ATTR_FILE_NAME *fname; 1234 struct MFT_REC *rec; 1235 u32 asize, dsize, sd_size; 1236 enum FILE_ATTRIBUTE fa; 1237 __le32 security_id = SECURITY_ID_INVALID; 1238 CLST vcn; 1239 const void *sd; 1240 u16 t16, nsize = 0, aid = 0; 1241 struct INDEX_ROOT *root, *dir_root; 1242 struct NTFS_DE *e, *new_de = NULL; 1243 struct REPARSE_DATA_BUFFER *rp = NULL; 1244 bool rp_inserted = false; 1245 1246 if (!fnd) 1247 ni_lock_dir(dir_ni); 1248 1249 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1250 if (!dir_root) { 1251 err = -EINVAL; 1252 goto out1; 1253 } 1254 1255 if (S_ISDIR(mode)) { 1256 /* Use parent's directory attributes. */ 1257 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1258 FILE_ATTRIBUTE_ARCHIVE; 1259 /* 1260 * By default child directory inherits parent attributes. 1261 * Root directory is hidden + system. 1262 * Make an exception for children in root. 1263 */ 1264 if (dir->i_ino == MFT_REC_ROOT) 1265 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1266 } else if (S_ISLNK(mode)) { 1267 /* It is good idea that link should be the same type (file/dir) as target */ 1268 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1269 1270 /* 1271 * Linux: there are dir/file/symlink and so on. 1272 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1273 * It is good idea to create: 1274 * dir + reparse if 'symname' points to directory 1275 * or 1276 * file + reparse if 'symname' points to file 1277 * Unfortunately kern_path hangs if symname contains 'dir'. 1278 */ 1279 1280 /* 1281 * struct path path; 1282 * 1283 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1284 * struct inode *target = d_inode(path.dentry); 1285 * 1286 * if (S_ISDIR(target->i_mode)) 1287 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1288 * // if ( target->i_sb == sb ){ 1289 * // use relative path? 1290 * // } 1291 * path_put(&path); 1292 * } 1293 */ 1294 } else if (S_ISREG(mode)) { 1295 if (sbi->options->sparse) { 1296 /* Sparsed regular file, cause option 'sparse'. */ 1297 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1298 FILE_ATTRIBUTE_ARCHIVE; 1299 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1300 /* Compressed regular file, if parent is compressed. */ 1301 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1302 } else { 1303 /* Regular file, default attributes. */ 1304 fa = FILE_ATTRIBUTE_ARCHIVE; 1305 } 1306 } else { 1307 fa = FILE_ATTRIBUTE_ARCHIVE; 1308 } 1309 1310 /* If option "hide_dot_files" then set hidden attribute for dot files. */ 1311 if (sbi->options->hide_dot_files && name->name[0] == '.') 1312 fa |= FILE_ATTRIBUTE_HIDDEN; 1313 1314 if (!(mode & 0222)) 1315 fa |= FILE_ATTRIBUTE_READONLY; 1316 1317 /* Allocate PATH_MAX bytes. */ 1318 new_de = __getname(); 1319 if (!new_de) { 1320 err = -ENOMEM; 1321 goto out1; 1322 } 1323 1324 if (unlikely(ntfs3_forced_shutdown(sb))) { 1325 err = -EIO; 1326 goto out2; 1327 } 1328 1329 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1330 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1331 1332 /* Step 1: allocate and fill new mft record. */ 1333 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1334 if (err) 1335 goto out2; 1336 1337 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); 1338 if (IS_ERR(ni)) { 1339 err = PTR_ERR(ni); 1340 ni = NULL; 1341 goto out3; 1342 } 1343 inode = &ni->vfs_inode; 1344 inode_init_owner(idmap, inode, dir, mode); 1345 mode = inode->i_mode; 1346 1347 ni->i_crtime = current_time(inode); 1348 1349 rec = ni->mi.mrec; 1350 rec->hard_links = cpu_to_le16(1); 1351 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1352 1353 /* Get default security id. */ 1354 sd = s_default_security; 1355 sd_size = sizeof(s_default_security); 1356 1357 if (is_ntfs3(sbi)) { 1358 security_id = dir_ni->std_security_id; 1359 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1360 security_id = sbi->security.def_security_id; 1361 1362 if (security_id == SECURITY_ID_INVALID && 1363 !ntfs_insert_security(sbi, sd, sd_size, 1364 &security_id, NULL)) 1365 sbi->security.def_security_id = security_id; 1366 } 1367 } 1368 1369 /* Insert standard info. */ 1370 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1371 1372 if (security_id == SECURITY_ID_INVALID) { 1373 dsize = sizeof(struct ATTR_STD_INFO); 1374 } else { 1375 dsize = sizeof(struct ATTR_STD_INFO5); 1376 std5->security_id = security_id; 1377 ni->std_security_id = security_id; 1378 } 1379 asize = SIZEOF_RESIDENT + dsize; 1380 1381 attr->type = ATTR_STD; 1382 attr->size = cpu_to_le32(asize); 1383 attr->id = cpu_to_le16(aid++); 1384 attr->res.data_off = SIZEOF_RESIDENT_LE; 1385 attr->res.data_size = cpu_to_le32(dsize); 1386 1387 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1388 kernel2nt(&ni->i_crtime); 1389 1390 std5->fa = ni->std_fa = fa; 1391 1392 attr = Add2Ptr(attr, asize); 1393 1394 /* Insert file name. */ 1395 err = fill_name_de(sbi, new_de, name, uni); 1396 if (err) 1397 goto out4; 1398 1399 mi_get_ref(&ni->mi, &new_de->ref); 1400 1401 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1402 1403 if (sbi->options->windows_names && 1404 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) { 1405 err = -EINVAL; 1406 goto out4; 1407 } 1408 1409 mi_get_ref(&dir_ni->mi, &fname->home); 1410 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1411 fname->dup.a_time = std5->cr_time; 1412 fname->dup.alloc_size = fname->dup.data_size = 0; 1413 fname->dup.fa = std5->fa; 1414 fname->dup.ea_size = fname->dup.reparse = 0; 1415 1416 dsize = le16_to_cpu(new_de->key_size); 1417 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1418 1419 attr->type = ATTR_NAME; 1420 attr->size = cpu_to_le32(asize); 1421 attr->res.data_off = SIZEOF_RESIDENT_LE; 1422 attr->res.flags = RESIDENT_FLAG_INDEXED; 1423 attr->id = cpu_to_le16(aid++); 1424 attr->res.data_size = cpu_to_le32(dsize); 1425 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1426 1427 attr = Add2Ptr(attr, asize); 1428 1429 if (security_id == SECURITY_ID_INVALID) { 1430 /* Insert security attribute. */ 1431 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1432 1433 attr->type = ATTR_SECURE; 1434 attr->size = cpu_to_le32(asize); 1435 attr->id = cpu_to_le16(aid++); 1436 attr->res.data_off = SIZEOF_RESIDENT_LE; 1437 attr->res.data_size = cpu_to_le32(sd_size); 1438 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1439 1440 attr = Add2Ptr(attr, asize); 1441 } 1442 1443 attr->id = cpu_to_le16(aid++); 1444 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1445 /* 1446 * Regular directory or symlink to directory. 1447 * Create root attribute. 1448 */ 1449 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1450 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1451 1452 attr->type = ATTR_ROOT; 1453 attr->size = cpu_to_le32(asize); 1454 1455 attr->name_len = ARRAY_SIZE(I30_NAME); 1456 attr->name_off = SIZEOF_RESIDENT_LE; 1457 attr->res.data_off = 1458 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1459 attr->res.data_size = cpu_to_le32(dsize); 1460 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1461 sizeof(I30_NAME)); 1462 1463 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1464 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1465 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); 1466 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1467 sizeof(struct NTFS_DE)); 1468 root->ihdr.total = root->ihdr.used; 1469 1470 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1471 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1472 e->flags = NTFS_IE_LAST; 1473 } else if (S_ISLNK(mode)) { 1474 /* 1475 * Symlink to file. 1476 * Create empty resident data attribute. 1477 */ 1478 asize = SIZEOF_RESIDENT; 1479 1480 /* Insert empty ATTR_DATA */ 1481 attr->type = ATTR_DATA; 1482 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1483 attr->name_off = SIZEOF_RESIDENT_LE; 1484 attr->res.data_off = SIZEOF_RESIDENT_LE; 1485 } else if (S_ISREG(mode)) { 1486 /* 1487 * Regular file. Create empty non resident data attribute. 1488 */ 1489 attr->type = ATTR_DATA; 1490 attr->non_res = 1; 1491 attr->nres.evcn = cpu_to_le64(-1ll); 1492 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1493 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1494 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1495 attr->flags = ATTR_FLAG_SPARSED; 1496 asize = SIZEOF_NONRESIDENT_EX + 8; 1497 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1498 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1499 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1500 attr->flags = ATTR_FLAG_COMPRESSED; 1501 attr->nres.c_unit = NTFS_LZNT_CUNIT; 1502 asize = SIZEOF_NONRESIDENT_EX + 8; 1503 } else { 1504 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1505 attr->name_off = SIZEOF_NONRESIDENT_LE; 1506 asize = SIZEOF_NONRESIDENT + 8; 1507 } 1508 attr->nres.run_off = attr->name_off; 1509 } else { 1510 /* 1511 * Node. Create empty resident data attribute. 1512 */ 1513 attr->type = ATTR_DATA; 1514 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1515 attr->name_off = SIZEOF_RESIDENT_LE; 1516 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1517 attr->flags = ATTR_FLAG_SPARSED; 1518 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1519 attr->flags = ATTR_FLAG_COMPRESSED; 1520 attr->res.data_off = SIZEOF_RESIDENT_LE; 1521 asize = SIZEOF_RESIDENT; 1522 ni->ni_flags |= NI_FLAG_RESIDENT; 1523 } 1524 1525 if (S_ISDIR(mode)) { 1526 ni->ni_flags |= NI_FLAG_DIR; 1527 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1528 if (err) 1529 goto out4; 1530 } else if (S_ISLNK(mode)) { 1531 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1532 1533 if (IS_ERR(rp)) { 1534 err = PTR_ERR(rp); 1535 rp = NULL; 1536 goto out4; 1537 } 1538 1539 /* 1540 * Insert ATTR_REPARSE. 1541 */ 1542 attr = Add2Ptr(attr, asize); 1543 attr->type = ATTR_REPARSE; 1544 attr->id = cpu_to_le16(aid++); 1545 1546 /* Resident or non resident? */ 1547 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1548 t16 = PtrOffset(rec, attr); 1549 1550 /* 1551 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1552 * It is good idea to keep extened attributes resident. 1553 */ 1554 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1555 CLST alen; 1556 CLST clst = bytes_to_cluster(sbi, nsize); 1557 1558 /* Bytes per runs. */ 1559 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1560 1561 attr->non_res = 1; 1562 attr->nres.evcn = cpu_to_le64(clst - 1); 1563 attr->name_off = SIZEOF_NONRESIDENT_LE; 1564 attr->nres.run_off = attr->name_off; 1565 attr->nres.data_size = cpu_to_le64(nsize); 1566 attr->nres.valid_size = attr->nres.data_size; 1567 attr->nres.alloc_size = 1568 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1569 1570 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1571 clst, NULL, ALLOCATE_DEF, 1572 &alen, 0, NULL, NULL); 1573 if (err) 1574 goto out5; 1575 1576 err = run_pack(&ni->file.run, 0, clst, 1577 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1578 &vcn); 1579 if (err < 0) 1580 goto out5; 1581 1582 if (vcn != clst) { 1583 err = -EINVAL; 1584 goto out5; 1585 } 1586 1587 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1588 /* Write non resident data. */ 1589 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, 1590 nsize, 0); 1591 if (err) 1592 goto out5; 1593 } else { 1594 attr->res.data_off = SIZEOF_RESIDENT_LE; 1595 attr->res.data_size = cpu_to_le32(nsize); 1596 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1597 } 1598 /* Size of symlink equals the length of input string. */ 1599 inode->i_size = size; 1600 1601 attr->size = cpu_to_le32(asize); 1602 1603 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1604 &new_de->ref); 1605 if (err) 1606 goto out5; 1607 1608 rp_inserted = true; 1609 } 1610 1611 attr = Add2Ptr(attr, asize); 1612 attr->type = ATTR_END; 1613 1614 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1615 rec->next_attr_id = cpu_to_le16(aid); 1616 1617 inode->i_generation = le16_to_cpu(rec->seq); 1618 1619 if (S_ISDIR(mode)) { 1620 inode->i_op = &ntfs_dir_inode_operations; 1621 inode->i_fop = &ntfs_dir_operations; 1622 } else if (S_ISLNK(mode)) { 1623 inode->i_op = &ntfs_link_inode_operations; 1624 inode->i_fop = NULL; 1625 inode->i_mapping->a_ops = &ntfs_aops; 1626 inode->i_size = size; 1627 inode_nohighmem(inode); 1628 } else if (S_ISREG(mode)) { 1629 inode->i_op = &ntfs_file_inode_operations; 1630 inode->i_fop = &ntfs_file_operations; 1631 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 1632 &ntfs_aops; 1633 init_rwsem(&ni->file.run_lock); 1634 } else { 1635 inode->i_op = &ntfs_special_inode_operations; 1636 init_special_inode(inode, mode, dev); 1637 } 1638 1639 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1640 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1641 err = ntfs_init_acl(idmap, inode, dir); 1642 if (err) 1643 goto out5; 1644 } else 1645 #endif 1646 { 1647 inode->i_flags |= S_NOSEC; 1648 } 1649 1650 /* 1651 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. 1652 * The packed size of extended attribute is stored in direntry too. 1653 * 'fname' here points to inside new_de. 1654 */ 1655 err = ntfs_save_wsl_perm(inode, &fname->dup.ea_size); 1656 if (err) 1657 goto out6; 1658 1659 /* 1660 * update ea_size in file_name attribute too. 1661 * Use ni_find_attr cause layout of MFT record may be changed 1662 * in ntfs_init_acl and ntfs_save_wsl_perm. 1663 */ 1664 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL); 1665 if (attr) { 1666 struct ATTR_FILE_NAME *fn; 1667 1668 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1669 if (fn) 1670 fn->dup.ea_size = fname->dup.ea_size; 1671 } 1672 1673 /* We do not need to update parent directory later */ 1674 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; 1675 1676 /* Step 2: Add new name in index. */ 1677 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1678 if (err) 1679 goto out6; 1680 1681 /* 1682 * Call 'd_instantiate' after inode->i_op is set 1683 * but before finish_open. 1684 */ 1685 d_instantiate(dentry, inode); 1686 1687 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ 1688 inode->i_atime = inode->i_mtime = 1689 inode_set_ctime_to_ts(inode, ni->i_crtime); 1690 dir->i_mtime = inode_set_ctime_to_ts(dir, ni->i_crtime); 1691 1692 mark_inode_dirty(dir); 1693 mark_inode_dirty(inode); 1694 1695 /* Normal exit. */ 1696 goto out2; 1697 1698 out6: 1699 attr = ni_find_attr(ni, NULL, NULL, ATTR_EA, NULL, 0, NULL, NULL); 1700 if (attr && attr->non_res) { 1701 /* Delete ATTR_EA, if non-resident. */ 1702 attr_set_size(ni, ATTR_EA, NULL, 0, NULL, 0, NULL, false, NULL); 1703 } 1704 1705 if (rp_inserted) 1706 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1707 1708 out5: 1709 if (!S_ISDIR(mode)) 1710 run_deallocate(sbi, &ni->file.run, false); 1711 1712 out4: 1713 clear_rec_inuse(rec); 1714 clear_nlink(inode); 1715 ni->mi.dirty = false; 1716 discard_new_inode(inode); 1717 out3: 1718 ntfs_mark_rec_free(sbi, ino, false); 1719 1720 out2: 1721 __putname(new_de); 1722 kfree(rp); 1723 1724 out1: 1725 if (!fnd) 1726 ni_unlock(dir_ni); 1727 1728 if (err) 1729 return ERR_PTR(err); 1730 1731 unlock_new_inode(inode); 1732 1733 return inode; 1734 } 1735 1736 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1737 { 1738 int err; 1739 struct ntfs_inode *ni = ntfs_i(inode); 1740 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1741 struct NTFS_DE *de; 1742 1743 /* Allocate PATH_MAX bytes. */ 1744 de = __getname(); 1745 if (!de) 1746 return -ENOMEM; 1747 1748 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1749 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1750 1751 /* Construct 'de'. */ 1752 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1753 if (err) 1754 goto out; 1755 1756 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1757 out: 1758 __putname(de); 1759 return err; 1760 } 1761 1762 /* 1763 * ntfs_unlink_inode 1764 * 1765 * inode_operations::unlink 1766 * inode_operations::rmdir 1767 */ 1768 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1769 { 1770 int err; 1771 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1772 struct inode *inode = d_inode(dentry); 1773 struct ntfs_inode *ni = ntfs_i(inode); 1774 struct ntfs_inode *dir_ni = ntfs_i(dir); 1775 struct NTFS_DE *de, *de2 = NULL; 1776 int undo_remove; 1777 1778 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1779 return -EINVAL; 1780 1781 /* Allocate PATH_MAX bytes. */ 1782 de = __getname(); 1783 if (!de) 1784 return -ENOMEM; 1785 1786 ni_lock(ni); 1787 1788 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1789 err = -ENOTEMPTY; 1790 goto out; 1791 } 1792 1793 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1794 if (err < 0) 1795 goto out; 1796 1797 undo_remove = 0; 1798 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1799 1800 if (!err) { 1801 drop_nlink(inode); 1802 dir->i_mtime = inode_set_ctime_current(dir); 1803 mark_inode_dirty(dir); 1804 inode_set_ctime_to_ts(inode, inode_get_ctime(dir)); 1805 if (inode->i_nlink) 1806 mark_inode_dirty(inode); 1807 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1808 _ntfs_bad_inode(inode); 1809 } else { 1810 if (ni_is_dirty(dir)) 1811 mark_inode_dirty(dir); 1812 if (ni_is_dirty(inode)) 1813 mark_inode_dirty(inode); 1814 } 1815 1816 out: 1817 ni_unlock(ni); 1818 __putname(de); 1819 return err; 1820 } 1821 1822 void ntfs_evict_inode(struct inode *inode) 1823 { 1824 truncate_inode_pages_final(&inode->i_data); 1825 1826 invalidate_inode_buffers(inode); 1827 clear_inode(inode); 1828 1829 ni_clear(ntfs_i(inode)); 1830 } 1831 1832 /* 1833 * ntfs_translate_junction 1834 * 1835 * Translate a Windows junction target to the Linux equivalent. 1836 * On junctions, targets are always absolute (they include the drive 1837 * letter). We have no way of knowing if the target is for the current 1838 * mounted device or not so we just assume it is. 1839 */ 1840 static int ntfs_translate_junction(const struct super_block *sb, 1841 const struct dentry *link_de, char *target, 1842 int target_len, int target_max) 1843 { 1844 int tl_len, err = target_len; 1845 char *link_path_buffer = NULL, *link_path; 1846 char *translated = NULL; 1847 char *target_start; 1848 int copy_len; 1849 1850 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); 1851 if (!link_path_buffer) { 1852 err = -ENOMEM; 1853 goto out; 1854 } 1855 /* Get link path, relative to mount point */ 1856 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); 1857 if (IS_ERR(link_path)) { 1858 ntfs_err(sb, "Error getting link path"); 1859 err = -EINVAL; 1860 goto out; 1861 } 1862 1863 translated = kmalloc(PATH_MAX, GFP_NOFS); 1864 if (!translated) { 1865 err = -ENOMEM; 1866 goto out; 1867 } 1868 1869 /* Make translated path a relative path to mount point */ 1870 strcpy(translated, "./"); 1871 ++link_path; /* Skip leading / */ 1872 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) { 1873 if (*link_path == '/') { 1874 if (PATH_MAX - tl_len < sizeof("../")) { 1875 ntfs_err(sb, 1876 "Link path %s has too many components", 1877 link_path); 1878 err = -EINVAL; 1879 goto out; 1880 } 1881 strcpy(translated + tl_len, "../"); 1882 tl_len += sizeof("../") - 1; 1883 } 1884 } 1885 1886 /* Skip drive letter */ 1887 target_start = target; 1888 while (*target_start && *target_start != ':') 1889 ++target_start; 1890 1891 if (!*target_start) { 1892 ntfs_err(sb, "Link target (%s) missing drive separator", 1893 target); 1894 err = -EINVAL; 1895 goto out; 1896 } 1897 1898 /* Skip drive separator and leading /, if exists */ 1899 target_start += 1 + (target_start[1] == '/'); 1900 copy_len = target_len - (target_start - target); 1901 1902 if (PATH_MAX - tl_len <= copy_len) { 1903 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)", 1904 target_start, PATH_MAX - tl_len, copy_len); 1905 err = -EINVAL; 1906 goto out; 1907 } 1908 1909 /* translated path has a trailing / and target_start does not */ 1910 strcpy(translated + tl_len, target_start); 1911 tl_len += copy_len; 1912 if (target_max <= tl_len) { 1913 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)", 1914 translated, target_max, tl_len); 1915 err = -EINVAL; 1916 goto out; 1917 } 1918 strcpy(target, translated); 1919 err = tl_len; 1920 1921 out: 1922 kfree(link_path_buffer); 1923 kfree(translated); 1924 return err; 1925 } 1926 1927 static noinline int ntfs_readlink_hlp(const struct dentry *link_de, 1928 struct inode *inode, char *buffer, 1929 int buflen) 1930 { 1931 int i, err = -EINVAL; 1932 struct ntfs_inode *ni = ntfs_i(inode); 1933 struct super_block *sb = inode->i_sb; 1934 struct ntfs_sb_info *sbi = sb->s_fs_info; 1935 u64 size; 1936 u16 ulen = 0; 1937 void *to_free = NULL; 1938 struct REPARSE_DATA_BUFFER *rp; 1939 const __le16 *uname; 1940 struct ATTRIB *attr; 1941 1942 /* Reparse data present. Try to parse it. */ 1943 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1944 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1945 1946 *buffer = 0; 1947 1948 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1949 if (!attr) 1950 goto out; 1951 1952 if (!attr->non_res) { 1953 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1954 if (!rp) 1955 goto out; 1956 size = le32_to_cpu(attr->res.data_size); 1957 } else { 1958 size = le64_to_cpu(attr->nres.data_size); 1959 rp = NULL; 1960 } 1961 1962 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1963 goto out; 1964 1965 if (!rp) { 1966 rp = kmalloc(size, GFP_NOFS); 1967 if (!rp) { 1968 err = -ENOMEM; 1969 goto out; 1970 } 1971 to_free = rp; 1972 /* Read into temporal buffer. */ 1973 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1974 if (err) 1975 goto out; 1976 } 1977 1978 /* Microsoft Tag. */ 1979 switch (rp->ReparseTag) { 1980 case IO_REPARSE_TAG_MOUNT_POINT: 1981 /* Mount points and junctions. */ 1982 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1983 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1984 MountPointReparseBuffer.PathBuffer)) 1985 goto out; 1986 uname = Add2Ptr(rp, 1987 offsetof(struct REPARSE_DATA_BUFFER, 1988 MountPointReparseBuffer.PathBuffer) + 1989 le16_to_cpu(rp->MountPointReparseBuffer 1990 .PrintNameOffset)); 1991 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1992 break; 1993 1994 case IO_REPARSE_TAG_SYMLINK: 1995 /* FolderSymbolicLink */ 1996 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1997 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1998 SymbolicLinkReparseBuffer.PathBuffer)) 1999 goto out; 2000 uname = Add2Ptr( 2001 rp, offsetof(struct REPARSE_DATA_BUFFER, 2002 SymbolicLinkReparseBuffer.PathBuffer) + 2003 le16_to_cpu(rp->SymbolicLinkReparseBuffer 2004 .PrintNameOffset)); 2005 ulen = le16_to_cpu( 2006 rp->SymbolicLinkReparseBuffer.PrintNameLength); 2007 break; 2008 2009 case IO_REPARSE_TAG_CLOUD: 2010 case IO_REPARSE_TAG_CLOUD_1: 2011 case IO_REPARSE_TAG_CLOUD_2: 2012 case IO_REPARSE_TAG_CLOUD_3: 2013 case IO_REPARSE_TAG_CLOUD_4: 2014 case IO_REPARSE_TAG_CLOUD_5: 2015 case IO_REPARSE_TAG_CLOUD_6: 2016 case IO_REPARSE_TAG_CLOUD_7: 2017 case IO_REPARSE_TAG_CLOUD_8: 2018 case IO_REPARSE_TAG_CLOUD_9: 2019 case IO_REPARSE_TAG_CLOUD_A: 2020 case IO_REPARSE_TAG_CLOUD_B: 2021 case IO_REPARSE_TAG_CLOUD_C: 2022 case IO_REPARSE_TAG_CLOUD_D: 2023 case IO_REPARSE_TAG_CLOUD_E: 2024 case IO_REPARSE_TAG_CLOUD_F: 2025 err = sizeof("OneDrive") - 1; 2026 if (err > buflen) 2027 err = buflen; 2028 memcpy(buffer, "OneDrive", err); 2029 goto out; 2030 2031 default: 2032 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 2033 /* Unknown Microsoft Tag. */ 2034 goto out; 2035 } 2036 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 2037 size <= sizeof(struct REPARSE_POINT)) { 2038 goto out; 2039 } 2040 2041 /* Users tag. */ 2042 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 2043 ulen = le16_to_cpu(rp->ReparseDataLength) - 2044 sizeof(struct REPARSE_POINT); 2045 } 2046 2047 /* Convert nlen from bytes to UNICODE chars. */ 2048 ulen >>= 1; 2049 2050 /* Check that name is available. */ 2051 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 2052 goto out; 2053 2054 /* If name is already zero terminated then truncate it now. */ 2055 if (!uname[ulen - 1]) 2056 ulen -= 1; 2057 2058 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 2059 2060 if (err < 0) 2061 goto out; 2062 2063 /* Translate Windows '\' into Linux '/'. */ 2064 for (i = 0; i < err; i++) { 2065 if (buffer[i] == '\\') 2066 buffer[i] = '/'; 2067 } 2068 2069 /* Always set last zero. */ 2070 buffer[err] = 0; 2071 2072 /* If this is a junction, translate the link target. */ 2073 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) 2074 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen); 2075 2076 out: 2077 kfree(to_free); 2078 return err; 2079 } 2080 2081 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 2082 struct delayed_call *done) 2083 { 2084 int err; 2085 char *ret; 2086 2087 if (!de) 2088 return ERR_PTR(-ECHILD); 2089 2090 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 2091 if (!ret) 2092 return ERR_PTR(-ENOMEM); 2093 2094 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE); 2095 if (err < 0) { 2096 kfree(ret); 2097 return ERR_PTR(err); 2098 } 2099 2100 set_delayed_call(done, kfree_link, ret); 2101 2102 return ret; 2103 } 2104 2105 // clang-format off 2106 const struct inode_operations ntfs_link_inode_operations = { 2107 .get_link = ntfs_get_link, 2108 .setattr = ntfs3_setattr, 2109 .listxattr = ntfs_listxattr, 2110 }; 2111 2112 const struct address_space_operations ntfs_aops = { 2113 .read_folio = ntfs_read_folio, 2114 .readahead = ntfs_readahead, 2115 .writepages = ntfs_writepages, 2116 .write_begin = ntfs_write_begin, 2117 .write_end = ntfs_write_end, 2118 .direct_IO = ntfs_direct_IO, 2119 .bmap = ntfs_bmap, 2120 .dirty_folio = block_dirty_folio, 2121 .migrate_folio = buffer_migrate_folio, 2122 .invalidate_folio = block_invalidate_folio, 2123 }; 2124 2125 const struct address_space_operations ntfs_aops_cmpr = { 2126 .read_folio = ntfs_read_folio, 2127 .readahead = ntfs_readahead, 2128 .dirty_folio = block_dirty_folio, 2129 }; 2130 // clang-format on 2131