1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 */ 7 8 #include <linux/buffer_head.h> 9 #include <linux/fs.h> 10 #include <linux/mpage.h> 11 #include <linux/namei.h> 12 #include <linux/nls.h> 13 #include <linux/uio.h> 14 #include <linux/writeback.h> 15 16 #include "debug.h" 17 #include "ntfs.h" 18 #include "ntfs_fs.h" 19 20 /* 21 * ntfs_read_mft - Read record and parses MFT. 22 */ 23 static struct inode *ntfs_read_mft(struct inode *inode, 24 const struct cpu_str *name, 25 const struct MFT_REF *ref) 26 { 27 int err = 0; 28 struct ntfs_inode *ni = ntfs_i(inode); 29 struct super_block *sb = inode->i_sb; 30 struct ntfs_sb_info *sbi = sb->s_fs_info; 31 mode_t mode = 0; 32 struct ATTR_STD_INFO5 *std5 = NULL; 33 struct ATTR_LIST_ENTRY *le; 34 struct ATTRIB *attr; 35 bool is_match = false; 36 bool is_root = false; 37 bool is_dir; 38 unsigned long ino = inode->i_ino; 39 u32 rp_fa = 0, asize, t32; 40 u16 roff, rsize, names = 0; 41 const struct ATTR_FILE_NAME *fname = NULL; 42 const struct INDEX_ROOT *root; 43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes 44 u64 t64; 45 struct MFT_REC *rec; 46 struct runs_tree *run; 47 struct timespec64 ts; 48 49 inode->i_op = NULL; 50 /* Setup 'uid' and 'gid' */ 51 inode->i_uid = sbi->options->fs_uid; 52 inode->i_gid = sbi->options->fs_gid; 53 54 err = mi_init(&ni->mi, sbi, ino); 55 if (err) 56 goto out; 57 58 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) { 59 t64 = sbi->mft.lbo >> sbi->cluster_bits; 60 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size); 61 sbi->mft.ni = ni; 62 init_rwsem(&ni->file.run_lock); 63 64 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) { 65 err = -ENOMEM; 66 goto out; 67 } 68 } 69 70 err = mi_read(&ni->mi, ino == MFT_REC_MFT); 71 72 if (err) 73 goto out; 74 75 rec = ni->mi.mrec; 76 77 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) { 78 ; 79 } else if (ref->seq != rec->seq) { 80 err = -EINVAL; 81 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino, 82 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq)); 83 goto out; 84 } else if (!is_rec_inuse(rec)) { 85 err = -ESTALE; 86 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino); 87 goto out; 88 } 89 90 if (le32_to_cpu(rec->total) != sbi->record_size) { 91 /* Bad inode? */ 92 err = -EINVAL; 93 goto out; 94 } 95 96 if (!is_rec_base(rec)) { 97 err = -EINVAL; 98 goto out; 99 } 100 101 /* Record should contain $I30 root. */ 102 is_dir = rec->flags & RECORD_FLAG_DIR; 103 104 /* MFT_REC_MFT is not a dir */ 105 if (is_dir && ino == MFT_REC_MFT) { 106 err = -EINVAL; 107 goto out; 108 } 109 110 inode->i_generation = le16_to_cpu(rec->seq); 111 112 /* Enumerate all struct Attributes MFT. */ 113 le = NULL; 114 attr = NULL; 115 116 /* 117 * To reduce tab pressure use goto instead of 118 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) )) 119 */ 120 next_attr: 121 run = NULL; 122 err = -EINVAL; 123 attr = ni_enum_attr_ex(ni, attr, &le, NULL); 124 if (!attr) 125 goto end_enum; 126 127 if (le && le->vcn) { 128 /* This is non primary attribute segment. Ignore if not MFT. */ 129 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA) 130 goto next_attr; 131 132 run = &ni->file.run; 133 asize = le32_to_cpu(attr->size); 134 goto attr_unpack_run; 135 } 136 137 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off); 138 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size); 139 asize = le32_to_cpu(attr->size); 140 141 /* 142 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'. 143 * There not critical to check this case again 144 */ 145 if (attr->name_len && 146 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) > 147 asize) 148 goto out; 149 150 if (attr->non_res) { 151 t64 = le64_to_cpu(attr->nres.alloc_size); 152 if (le64_to_cpu(attr->nres.data_size) > t64 || 153 le64_to_cpu(attr->nres.valid_size) > t64) 154 goto out; 155 } 156 157 switch (attr->type) { 158 case ATTR_STD: 159 if (attr->non_res || 160 asize < sizeof(struct ATTR_STD_INFO) + roff || 161 rsize < sizeof(struct ATTR_STD_INFO)) 162 goto out; 163 164 if (std5) 165 goto next_attr; 166 167 std5 = Add2Ptr(attr, roff); 168 169 #ifdef STATX_BTIME 170 nt2kernel(std5->cr_time, &ni->i_crtime); 171 #endif 172 nt2kernel(std5->a_time, &ts); 173 inode_set_atime_to_ts(inode, ts); 174 nt2kernel(std5->c_time, &ts); 175 inode_set_ctime_to_ts(inode, ts); 176 nt2kernel(std5->m_time, &ts); 177 inode_set_mtime_to_ts(inode, ts); 178 179 ni->std_fa = std5->fa; 180 181 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && 182 rsize >= sizeof(struct ATTR_STD_INFO5)) 183 ni->std_security_id = std5->security_id; 184 goto next_attr; 185 186 case ATTR_LIST: 187 if (attr->name_len || le || ino == MFT_REC_LOG) 188 goto out; 189 190 err = ntfs_load_attr_list(ni, attr); 191 if (err) 192 goto out; 193 194 le = NULL; 195 attr = NULL; 196 goto next_attr; 197 198 case ATTR_NAME: 199 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || 200 rsize < SIZEOF_ATTRIBUTE_FILENAME) 201 goto out; 202 203 fname = Add2Ptr(attr, roff); 204 if (fname->type == FILE_NAME_DOS) 205 goto next_attr; 206 207 names += 1; 208 if (name && name->len == fname->name_len && 209 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, 210 NULL, false)) 211 is_match = true; 212 213 goto next_attr; 214 215 case ATTR_DATA: 216 if (is_dir) { 217 /* Ignore data attribute in dir record. */ 218 goto next_attr; 219 } 220 221 if (ino == MFT_REC_BADCLUST && !attr->non_res) 222 goto next_attr; 223 224 if (attr->name_len && 225 ((ino != MFT_REC_BADCLUST || !attr->non_res || 226 attr->name_len != ARRAY_SIZE(BAD_NAME) || 227 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && 228 (ino != MFT_REC_SECURE || !attr->non_res || 229 attr->name_len != ARRAY_SIZE(SDS_NAME) || 230 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { 231 /* File contains stream attribute. Ignore it. */ 232 goto next_attr; 233 } 234 235 if (is_attr_sparsed(attr)) 236 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; 237 else 238 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; 239 240 if (is_attr_compressed(attr)) 241 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; 242 else 243 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; 244 245 if (is_attr_encrypted(attr)) 246 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; 247 else 248 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; 249 250 if (!attr->non_res) { 251 ni->i_valid = inode->i_size = rsize; 252 inode_set_bytes(inode, rsize); 253 } 254 255 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); 256 257 if (!attr->non_res) { 258 ni->ni_flags |= NI_FLAG_RESIDENT; 259 goto next_attr; 260 } 261 262 inode_set_bytes(inode, attr_ondisk_size(attr)); 263 264 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 265 inode->i_size = le64_to_cpu(attr->nres.data_size); 266 if (!attr->nres.alloc_size) 267 goto next_attr; 268 269 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run : 270 &ni->file.run; 271 break; 272 273 case ATTR_ROOT: 274 if (attr->non_res) 275 goto out; 276 277 root = Add2Ptr(attr, roff); 278 279 if (attr->name_len != ARRAY_SIZE(I30_NAME) || 280 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 281 goto next_attr; 282 283 if (root->type != ATTR_NAME || 284 root->rule != NTFS_COLLATION_TYPE_FILENAME) 285 goto out; 286 287 if (!is_dir) 288 goto next_attr; 289 290 is_root = true; 291 ni->ni_flags |= NI_FLAG_DIR; 292 293 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 294 if (err) 295 goto out; 296 297 mode = sb->s_root ? 298 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) : 299 (S_IFDIR | 0777); 300 goto next_attr; 301 302 case ATTR_ALLOC: 303 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || 304 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 305 goto next_attr; 306 307 inode->i_size = le64_to_cpu(attr->nres.data_size); 308 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 309 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); 310 311 run = &ni->dir.alloc_run; 312 break; 313 314 case ATTR_BITMAP: 315 if (ino == MFT_REC_MFT) { 316 if (!attr->non_res) 317 goto out; 318 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 319 /* 0x20000000 = 2^32 / 8 */ 320 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) 321 goto out; 322 #endif 323 run = &sbi->mft.bitmap.run; 324 break; 325 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && 326 !memcmp(attr_name(attr), I30_NAME, 327 sizeof(I30_NAME)) && 328 attr->non_res) { 329 run = &ni->dir.bitmap_run; 330 break; 331 } 332 goto next_attr; 333 334 case ATTR_REPARSE: 335 if (attr->name_len) 336 goto next_attr; 337 338 rp_fa = ni_parse_reparse(ni, attr, &rp); 339 switch (rp_fa) { 340 case REPARSE_LINK: 341 /* 342 * Normal symlink. 343 * Assume one unicode symbol == one utf8. 344 */ 345 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer 346 .PrintNameLength) / 347 sizeof(u16); 348 ni->i_valid = inode->i_size; 349 /* Clear directory bit. */ 350 if (ni->ni_flags & NI_FLAG_DIR) { 351 indx_clear(&ni->dir); 352 memset(&ni->dir, 0, sizeof(ni->dir)); 353 ni->ni_flags &= ~NI_FLAG_DIR; 354 } else { 355 run_close(&ni->file.run); 356 } 357 mode = S_IFLNK | 0777; 358 is_dir = false; 359 if (attr->non_res) { 360 run = &ni->file.run; 361 goto attr_unpack_run; // Double break. 362 } 363 break; 364 365 case REPARSE_COMPRESSED: 366 break; 367 368 case REPARSE_DEDUPLICATED: 369 break; 370 } 371 goto next_attr; 372 373 case ATTR_EA_INFO: 374 if (!attr->name_len && 375 resident_data_ex(attr, sizeof(struct EA_INFO))) { 376 ni->ni_flags |= NI_FLAG_EA; 377 /* 378 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode 379 */ 380 inode->i_mode = mode; 381 ntfs_get_wsl_perm(inode); 382 mode = inode->i_mode; 383 } 384 goto next_attr; 385 386 default: 387 goto next_attr; 388 } 389 390 attr_unpack_run: 391 roff = le16_to_cpu(attr->nres.run_off); 392 393 if (roff > asize) { 394 err = -EINVAL; 395 goto out; 396 } 397 398 t64 = le64_to_cpu(attr->nres.svcn); 399 400 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), 401 t64, Add2Ptr(attr, roff), asize - roff); 402 if (err < 0) 403 goto out; 404 err = 0; 405 goto next_attr; 406 407 end_enum: 408 409 if (!std5) 410 goto out; 411 412 if (!is_match && name) { 413 err = -ENOENT; 414 goto out; 415 } 416 417 if (std5->fa & FILE_ATTRIBUTE_READONLY) 418 mode &= ~0222; 419 420 if (!names) { 421 err = -EINVAL; 422 goto out; 423 } 424 425 if (names != le16_to_cpu(rec->hard_links)) { 426 /* Correct minor error on the fly. Do not mark inode as dirty. */ 427 ntfs_inode_warn(inode, "Correct links count -> %u.", names); 428 rec->hard_links = cpu_to_le16(names); 429 ni->mi.dirty = true; 430 } 431 432 set_nlink(inode, names); 433 434 if (S_ISDIR(mode)) { 435 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; 436 437 /* 438 * Dot and dot-dot should be included in count but was not 439 * included in enumeration. 440 * Usually a hard links to directories are disabled. 441 */ 442 inode->i_op = &ntfs_dir_inode_operations; 443 inode->i_fop = &ntfs_dir_operations; 444 ni->i_valid = 0; 445 } else if (S_ISLNK(mode)) { 446 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 447 inode->i_op = &ntfs_link_inode_operations; 448 inode->i_fop = NULL; 449 inode_nohighmem(inode); 450 } else if (S_ISREG(mode)) { 451 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 452 inode->i_op = &ntfs_file_inode_operations; 453 inode->i_fop = &ntfs_file_operations; 454 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 455 &ntfs_aops; 456 if (ino != MFT_REC_MFT) 457 init_rwsem(&ni->file.run_lock); 458 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || 459 S_ISSOCK(mode)) { 460 inode->i_op = &ntfs_special_inode_operations; 461 init_special_inode(inode, mode, inode->i_rdev); 462 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && 463 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { 464 /* Records in $Extend are not a files or general directories. */ 465 inode->i_op = &ntfs_file_inode_operations; 466 } else { 467 err = -EINVAL; 468 goto out; 469 } 470 471 if ((sbi->options->sys_immutable && 472 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 473 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 474 inode->i_flags |= S_IMMUTABLE; 475 } else { 476 inode->i_flags &= ~S_IMMUTABLE; 477 } 478 479 inode->i_mode = mode; 480 if (!(ni->ni_flags & NI_FLAG_EA)) { 481 /* If no xattr then no security (stored in xattr). */ 482 inode->i_flags |= S_NOSEC; 483 } 484 485 if (ino == MFT_REC_MFT && !sb->s_root) 486 sbi->mft.ni = NULL; 487 488 unlock_new_inode(inode); 489 490 return inode; 491 492 out: 493 if (ino == MFT_REC_MFT && !sb->s_root) 494 sbi->mft.ni = NULL; 495 496 iget_failed(inode); 497 return ERR_PTR(err); 498 } 499 500 /* 501 * ntfs_test_inode 502 * 503 * Return: 1 if match. 504 */ 505 static int ntfs_test_inode(struct inode *inode, void *data) 506 { 507 struct MFT_REF *ref = data; 508 509 return ino_get(ref) == inode->i_ino; 510 } 511 512 static int ntfs_set_inode(struct inode *inode, void *data) 513 { 514 const struct MFT_REF *ref = data; 515 516 inode->i_ino = ino_get(ref); 517 return 0; 518 } 519 520 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 521 const struct cpu_str *name) 522 { 523 struct inode *inode; 524 525 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 526 (void *)ref); 527 if (unlikely(!inode)) 528 return ERR_PTR(-ENOMEM); 529 530 /* If this is a freshly allocated inode, need to read it now. */ 531 if (inode->i_state & I_NEW) 532 inode = ntfs_read_mft(inode, name, ref); 533 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 534 /* Inode overlaps? */ 535 _ntfs_bad_inode(inode); 536 } 537 538 if (IS_ERR(inode) && name) 539 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR); 540 541 return inode; 542 } 543 544 enum get_block_ctx { 545 GET_BLOCK_GENERAL = 0, 546 GET_BLOCK_WRITE_BEGIN = 1, 547 GET_BLOCK_DIRECT_IO_R = 2, 548 GET_BLOCK_DIRECT_IO_W = 3, 549 GET_BLOCK_BMAP = 4, 550 }; 551 552 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 553 struct buffer_head *bh, int create, 554 enum get_block_ctx ctx) 555 { 556 struct super_block *sb = inode->i_sb; 557 struct ntfs_sb_info *sbi = sb->s_fs_info; 558 struct ntfs_inode *ni = ntfs_i(inode); 559 struct folio *folio = bh->b_folio; 560 u8 cluster_bits = sbi->cluster_bits; 561 u32 block_size = sb->s_blocksize; 562 u64 bytes, lbo, valid; 563 u32 off; 564 int err; 565 CLST vcn, lcn, len; 566 bool new; 567 568 /* Clear previous state. */ 569 clear_buffer_new(bh); 570 clear_buffer_uptodate(bh); 571 572 if (is_resident(ni)) { 573 ni_lock(ni); 574 err = attr_data_read_resident(ni, &folio->page); 575 ni_unlock(ni); 576 577 if (!err) 578 set_buffer_uptodate(bh); 579 bh->b_size = block_size; 580 return err; 581 } 582 583 vcn = vbo >> cluster_bits; 584 off = vbo & sbi->cluster_mask; 585 new = false; 586 587 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL, 588 create && sbi->cluster_size > PAGE_SIZE); 589 if (err) 590 goto out; 591 592 if (!len) 593 return 0; 594 595 bytes = ((u64)len << cluster_bits) - off; 596 597 if (lcn == SPARSE_LCN) { 598 if (!create) { 599 if (bh->b_size > bytes) 600 bh->b_size = bytes; 601 return 0; 602 } 603 WARN_ON(1); 604 } 605 606 if (new) 607 set_buffer_new(bh); 608 609 lbo = ((u64)lcn << cluster_bits) + off; 610 611 set_buffer_mapped(bh); 612 bh->b_bdev = sb->s_bdev; 613 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 614 615 valid = ni->i_valid; 616 617 if (ctx == GET_BLOCK_DIRECT_IO_W) { 618 /* ntfs_direct_IO will update ni->i_valid. */ 619 if (vbo >= valid) 620 set_buffer_new(bh); 621 } else if (create) { 622 /* Normal write. */ 623 if (bytes > bh->b_size) 624 bytes = bh->b_size; 625 626 if (vbo >= valid) 627 set_buffer_new(bh); 628 629 if (vbo + bytes > valid) { 630 ni->i_valid = vbo + bytes; 631 mark_inode_dirty(inode); 632 } 633 } else if (vbo >= valid) { 634 /* Read out of valid data. */ 635 clear_buffer_mapped(bh); 636 } else if (vbo + bytes <= valid) { 637 /* Normal read. */ 638 } else if (vbo + block_size <= valid) { 639 /* Normal short read. */ 640 bytes = block_size; 641 } else { 642 /* 643 * Read across valid size: vbo < valid && valid < vbo + block_size 644 */ 645 bytes = block_size; 646 647 if (folio) { 648 u32 voff = valid - vbo; 649 650 bh->b_size = block_size; 651 off = vbo & (PAGE_SIZE - 1); 652 folio_set_bh(bh, folio, off); 653 654 if (bh_read(bh, 0) < 0) { 655 err = -EIO; 656 goto out; 657 } 658 folio_zero_segment(folio, off + voff, off + block_size); 659 } 660 } 661 662 if (bh->b_size > bytes) 663 bh->b_size = bytes; 664 665 #ifndef __LP64__ 666 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 667 static_assert(sizeof(size_t) < sizeof(loff_t)); 668 if (bytes > 0x40000000u) 669 bh->b_size = 0x40000000u; 670 } 671 #endif 672 673 return 0; 674 675 out: 676 return err; 677 } 678 679 int ntfs_get_block(struct inode *inode, sector_t vbn, 680 struct buffer_head *bh_result, int create) 681 { 682 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 683 bh_result, create, GET_BLOCK_GENERAL); 684 } 685 686 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 687 struct buffer_head *bh_result, int create) 688 { 689 return ntfs_get_block_vbo(inode, 690 (u64)vsn << inode->i_sb->s_blocksize_bits, 691 bh_result, create, GET_BLOCK_BMAP); 692 } 693 694 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 695 { 696 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 697 } 698 699 static int ntfs_read_folio(struct file *file, struct folio *folio) 700 { 701 struct page *page = &folio->page; 702 int err; 703 struct address_space *mapping = page->mapping; 704 struct inode *inode = mapping->host; 705 struct ntfs_inode *ni = ntfs_i(inode); 706 707 if (is_resident(ni)) { 708 ni_lock(ni); 709 err = attr_data_read_resident(ni, page); 710 ni_unlock(ni); 711 if (err != E_NTFS_NONRESIDENT) { 712 unlock_page(page); 713 return err; 714 } 715 } 716 717 if (is_compressed(ni)) { 718 ni_lock(ni); 719 err = ni_readpage_cmpr(ni, page); 720 ni_unlock(ni); 721 return err; 722 } 723 724 /* Normal + sparse files. */ 725 return mpage_read_folio(folio, ntfs_get_block); 726 } 727 728 static void ntfs_readahead(struct readahead_control *rac) 729 { 730 struct address_space *mapping = rac->mapping; 731 struct inode *inode = mapping->host; 732 struct ntfs_inode *ni = ntfs_i(inode); 733 u64 valid; 734 loff_t pos; 735 736 if (is_resident(ni)) { 737 /* No readahead for resident. */ 738 return; 739 } 740 741 if (is_compressed(ni)) { 742 /* No readahead for compressed. */ 743 return; 744 } 745 746 valid = ni->i_valid; 747 pos = readahead_pos(rac); 748 749 if (valid < i_size_read(inode) && pos <= valid && 750 valid < pos + readahead_length(rac)) { 751 /* Range cross 'valid'. Read it page by page. */ 752 return; 753 } 754 755 mpage_readahead(rac, ntfs_get_block); 756 } 757 758 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 759 struct buffer_head *bh_result, int create) 760 { 761 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 762 bh_result, create, GET_BLOCK_DIRECT_IO_R); 763 } 764 765 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 766 struct buffer_head *bh_result, int create) 767 { 768 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 769 bh_result, create, GET_BLOCK_DIRECT_IO_W); 770 } 771 772 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 773 { 774 struct file *file = iocb->ki_filp; 775 struct address_space *mapping = file->f_mapping; 776 struct inode *inode = mapping->host; 777 struct ntfs_inode *ni = ntfs_i(inode); 778 loff_t vbo = iocb->ki_pos; 779 loff_t end; 780 int wr = iov_iter_rw(iter) & WRITE; 781 size_t iter_count = iov_iter_count(iter); 782 loff_t valid; 783 ssize_t ret; 784 785 if (is_resident(ni)) { 786 /* Switch to buffered write. */ 787 ret = 0; 788 goto out; 789 } 790 791 ret = blockdev_direct_IO(iocb, inode, iter, 792 wr ? ntfs_get_block_direct_IO_W : 793 ntfs_get_block_direct_IO_R); 794 795 if (ret > 0) 796 end = vbo + ret; 797 else if (wr && ret == -EIOCBQUEUED) 798 end = vbo + iter_count; 799 else 800 goto out; 801 802 valid = ni->i_valid; 803 if (wr) { 804 if (end > valid && !S_ISBLK(inode->i_mode)) { 805 ni->i_valid = end; 806 mark_inode_dirty(inode); 807 } 808 } else if (vbo < valid && valid < end) { 809 /* Fix page. */ 810 iov_iter_revert(iter, end - valid); 811 iov_iter_zero(end - valid, iter); 812 } 813 814 out: 815 return ret; 816 } 817 818 int ntfs_set_size(struct inode *inode, u64 new_size) 819 { 820 struct super_block *sb = inode->i_sb; 821 struct ntfs_sb_info *sbi = sb->s_fs_info; 822 struct ntfs_inode *ni = ntfs_i(inode); 823 int err; 824 825 /* Check for maximum file size. */ 826 if (is_sparsed(ni) || is_compressed(ni)) { 827 if (new_size > sbi->maxbytes_sparse) { 828 err = -EFBIG; 829 goto out; 830 } 831 } else if (new_size > sbi->maxbytes) { 832 err = -EFBIG; 833 goto out; 834 } 835 836 ni_lock(ni); 837 down_write(&ni->file.run_lock); 838 839 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 840 &ni->i_valid, true, NULL); 841 842 up_write(&ni->file.run_lock); 843 ni_unlock(ni); 844 845 mark_inode_dirty(inode); 846 847 out: 848 return err; 849 } 850 851 static int ntfs_resident_writepage(struct folio *folio, 852 struct writeback_control *wbc, void *data) 853 { 854 struct address_space *mapping = data; 855 struct inode *inode = mapping->host; 856 struct ntfs_inode *ni = ntfs_i(inode); 857 int ret; 858 859 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 860 return -EIO; 861 862 ni_lock(ni); 863 ret = attr_data_write_resident(ni, &folio->page); 864 ni_unlock(ni); 865 866 if (ret != E_NTFS_NONRESIDENT) 867 folio_unlock(folio); 868 mapping_set_error(mapping, ret); 869 return ret; 870 } 871 872 static int ntfs_writepages(struct address_space *mapping, 873 struct writeback_control *wbc) 874 { 875 struct inode *inode = mapping->host; 876 877 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 878 return -EIO; 879 880 if (is_resident(ntfs_i(inode))) 881 return write_cache_pages(mapping, wbc, ntfs_resident_writepage, 882 mapping); 883 return mpage_writepages(mapping, wbc, ntfs_get_block); 884 } 885 886 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 887 struct buffer_head *bh_result, int create) 888 { 889 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 890 bh_result, create, GET_BLOCK_WRITE_BEGIN); 891 } 892 893 int ntfs_write_begin(struct file *file, struct address_space *mapping, 894 loff_t pos, u32 len, struct page **pagep, void **fsdata) 895 { 896 int err; 897 struct inode *inode = mapping->host; 898 struct ntfs_inode *ni = ntfs_i(inode); 899 900 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 901 return -EIO; 902 903 *pagep = NULL; 904 if (is_resident(ni)) { 905 struct page *page = 906 grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT); 907 908 if (!page) { 909 err = -ENOMEM; 910 goto out; 911 } 912 913 ni_lock(ni); 914 err = attr_data_read_resident(ni, page); 915 ni_unlock(ni); 916 917 if (!err) { 918 *pagep = page; 919 goto out; 920 } 921 unlock_page(page); 922 put_page(page); 923 924 if (err != E_NTFS_NONRESIDENT) 925 goto out; 926 } 927 928 err = block_write_begin(mapping, pos, len, pagep, 929 ntfs_get_block_write_begin); 930 931 out: 932 return err; 933 } 934 935 /* 936 * ntfs_write_end - Address_space_operations::write_end. 937 */ 938 int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, 939 u32 len, u32 copied, struct page *page, void *fsdata) 940 { 941 struct inode *inode = mapping->host; 942 struct ntfs_inode *ni = ntfs_i(inode); 943 u64 valid = ni->i_valid; 944 bool dirty = false; 945 int err; 946 947 if (is_resident(ni)) { 948 ni_lock(ni); 949 err = attr_data_write_resident(ni, page); 950 ni_unlock(ni); 951 if (!err) { 952 dirty = true; 953 /* Clear any buffers in page. */ 954 if (page_has_buffers(page)) { 955 struct buffer_head *head, *bh; 956 957 bh = head = page_buffers(page); 958 do { 959 clear_buffer_dirty(bh); 960 clear_buffer_mapped(bh); 961 set_buffer_uptodate(bh); 962 } while (head != (bh = bh->b_this_page)); 963 } 964 SetPageUptodate(page); 965 err = copied; 966 } 967 unlock_page(page); 968 put_page(page); 969 } else { 970 err = generic_write_end(file, mapping, pos, len, copied, page, 971 fsdata); 972 } 973 974 if (err >= 0) { 975 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 976 inode_set_mtime_to_ts(inode, 977 inode_set_ctime_current(inode)); 978 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 979 dirty = true; 980 } 981 982 if (valid != ni->i_valid) { 983 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 984 dirty = true; 985 } 986 987 if (pos + err > inode->i_size) { 988 i_size_write(inode, pos + err); 989 dirty = true; 990 } 991 992 if (dirty) 993 mark_inode_dirty(inode); 994 } 995 996 return err; 997 } 998 999 int reset_log_file(struct inode *inode) 1000 { 1001 int err; 1002 loff_t pos = 0; 1003 u32 log_size = inode->i_size; 1004 struct address_space *mapping = inode->i_mapping; 1005 1006 for (;;) { 1007 u32 len; 1008 void *kaddr; 1009 struct page *page; 1010 1011 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 1012 1013 err = block_write_begin(mapping, pos, len, &page, 1014 ntfs_get_block_write_begin); 1015 if (err) 1016 goto out; 1017 1018 kaddr = kmap_atomic(page); 1019 memset(kaddr, -1, len); 1020 kunmap_atomic(kaddr); 1021 flush_dcache_page(page); 1022 1023 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 1024 if (err < 0) 1025 goto out; 1026 pos += len; 1027 1028 if (pos >= log_size) 1029 break; 1030 balance_dirty_pages_ratelimited(mapping); 1031 } 1032 out: 1033 mark_inode_dirty_sync(inode); 1034 1035 return err; 1036 } 1037 1038 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1039 { 1040 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1041 } 1042 1043 int ntfs_sync_inode(struct inode *inode) 1044 { 1045 return _ni_write_inode(inode, 1); 1046 } 1047 1048 /* 1049 * writeback_inode - Helper function for ntfs_flush_inodes(). 1050 * 1051 * This writes both the inode and the file data blocks, waiting 1052 * for in flight data blocks before the start of the call. It 1053 * does not wait for any io started during the call. 1054 */ 1055 static int writeback_inode(struct inode *inode) 1056 { 1057 int ret = sync_inode_metadata(inode, 0); 1058 1059 if (!ret) 1060 ret = filemap_fdatawrite(inode->i_mapping); 1061 return ret; 1062 } 1063 1064 /* 1065 * ntfs_flush_inodes 1066 * 1067 * Write data and metadata corresponding to i1 and i2. The io is 1068 * started but we do not wait for any of it to finish. 1069 * 1070 * filemap_flush() is used for the block device, so if there is a dirty 1071 * page for a block already in flight, we will not wait and start the 1072 * io over again. 1073 */ 1074 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1075 struct inode *i2) 1076 { 1077 int ret = 0; 1078 1079 if (i1) 1080 ret = writeback_inode(i1); 1081 if (!ret && i2) 1082 ret = writeback_inode(i2); 1083 if (!ret) 1084 ret = sync_blockdev_nowait(sb->s_bdev); 1085 return ret; 1086 } 1087 1088 int inode_write_data(struct inode *inode, const void *data, size_t bytes) 1089 { 1090 pgoff_t idx; 1091 1092 /* Write non resident data. */ 1093 for (idx = 0; bytes; idx++) { 1094 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1095 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1096 1097 if (IS_ERR(page)) 1098 return PTR_ERR(page); 1099 1100 lock_page(page); 1101 WARN_ON(!PageUptodate(page)); 1102 ClearPageUptodate(page); 1103 1104 memcpy(page_address(page), data, op); 1105 1106 flush_dcache_page(page); 1107 SetPageUptodate(page); 1108 unlock_page(page); 1109 1110 ntfs_unmap_page(page); 1111 1112 bytes -= op; 1113 data = Add2Ptr(data, PAGE_SIZE); 1114 } 1115 return 0; 1116 } 1117 1118 /* 1119 * ntfs_reparse_bytes 1120 * 1121 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1122 * for unicode string of @uni_len length. 1123 */ 1124 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1125 { 1126 /* Header + unicode string + decorated unicode string. */ 1127 return sizeof(short) * (2 * uni_len + 4) + 1128 offsetof(struct REPARSE_DATA_BUFFER, 1129 SymbolicLinkReparseBuffer.PathBuffer); 1130 } 1131 1132 static struct REPARSE_DATA_BUFFER * 1133 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1134 u32 size, u16 *nsize) 1135 { 1136 int i, err; 1137 struct REPARSE_DATA_BUFFER *rp; 1138 __le16 *rp_name; 1139 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1140 1141 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1142 if (!rp) 1143 return ERR_PTR(-ENOMEM); 1144 1145 rs = &rp->SymbolicLinkReparseBuffer; 1146 rp_name = rs->PathBuffer; 1147 1148 /* Convert link name to UTF-16. */ 1149 err = ntfs_nls_to_utf16(sbi, symname, size, 1150 (struct cpu_str *)(rp_name - 1), 2 * size, 1151 UTF16_LITTLE_ENDIAN); 1152 if (err < 0) 1153 goto out; 1154 1155 /* err = the length of unicode name of symlink. */ 1156 *nsize = ntfs_reparse_bytes(err); 1157 1158 if (*nsize > sbi->reparse.max_size) { 1159 err = -EFBIG; 1160 goto out; 1161 } 1162 1163 /* Translate Linux '/' into Windows '\'. */ 1164 for (i = 0; i < err; i++) { 1165 if (rp_name[i] == cpu_to_le16('/')) 1166 rp_name[i] = cpu_to_le16('\\'); 1167 } 1168 1169 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1170 rp->ReparseDataLength = 1171 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1172 SymbolicLinkReparseBuffer)); 1173 1174 /* PrintName + SubstituteName. */ 1175 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1176 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1177 rs->PrintNameLength = rs->SubstituteNameOffset; 1178 1179 /* 1180 * TODO: Use relative path if possible to allow Windows to 1181 * parse this path. 1182 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1183 */ 1184 rs->Flags = 0; 1185 1186 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1187 1188 /* Decorate SubstituteName. */ 1189 rp_name += err; 1190 rp_name[0] = cpu_to_le16('\\'); 1191 rp_name[1] = cpu_to_le16('?'); 1192 rp_name[2] = cpu_to_le16('?'); 1193 rp_name[3] = cpu_to_le16('\\'); 1194 1195 return rp; 1196 out: 1197 kfree(rp); 1198 return ERR_PTR(err); 1199 } 1200 1201 /* 1202 * ntfs_create_inode 1203 * 1204 * Helper function for: 1205 * - ntfs_create 1206 * - ntfs_mknod 1207 * - ntfs_symlink 1208 * - ntfs_mkdir 1209 * - ntfs_atomic_open 1210 * 1211 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked 1212 */ 1213 struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, 1214 struct dentry *dentry, 1215 const struct cpu_str *uni, umode_t mode, 1216 dev_t dev, const char *symname, u32 size, 1217 struct ntfs_fnd *fnd) 1218 { 1219 int err; 1220 struct super_block *sb = dir->i_sb; 1221 struct ntfs_sb_info *sbi = sb->s_fs_info; 1222 const struct qstr *name = &dentry->d_name; 1223 CLST ino = 0; 1224 struct ntfs_inode *dir_ni = ntfs_i(dir); 1225 struct ntfs_inode *ni = NULL; 1226 struct inode *inode = NULL; 1227 struct ATTRIB *attr; 1228 struct ATTR_STD_INFO5 *std5; 1229 struct ATTR_FILE_NAME *fname; 1230 struct MFT_REC *rec; 1231 u32 asize, dsize, sd_size; 1232 enum FILE_ATTRIBUTE fa; 1233 __le32 security_id = SECURITY_ID_INVALID; 1234 CLST vcn; 1235 const void *sd; 1236 u16 t16, nsize = 0, aid = 0; 1237 struct INDEX_ROOT *root, *dir_root; 1238 struct NTFS_DE *e, *new_de = NULL; 1239 struct REPARSE_DATA_BUFFER *rp = NULL; 1240 bool rp_inserted = false; 1241 1242 if (!fnd) 1243 ni_lock_dir(dir_ni); 1244 1245 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1246 if (!dir_root) { 1247 err = -EINVAL; 1248 goto out1; 1249 } 1250 1251 if (S_ISDIR(mode)) { 1252 /* Use parent's directory attributes. */ 1253 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1254 FILE_ATTRIBUTE_ARCHIVE; 1255 /* 1256 * By default child directory inherits parent attributes. 1257 * Root directory is hidden + system. 1258 * Make an exception for children in root. 1259 */ 1260 if (dir->i_ino == MFT_REC_ROOT) 1261 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1262 } else if (S_ISLNK(mode)) { 1263 /* It is good idea that link should be the same type (file/dir) as target */ 1264 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1265 1266 /* 1267 * Linux: there are dir/file/symlink and so on. 1268 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1269 * It is good idea to create: 1270 * dir + reparse if 'symname' points to directory 1271 * or 1272 * file + reparse if 'symname' points to file 1273 * Unfortunately kern_path hangs if symname contains 'dir'. 1274 */ 1275 1276 /* 1277 * struct path path; 1278 * 1279 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1280 * struct inode *target = d_inode(path.dentry); 1281 * 1282 * if (S_ISDIR(target->i_mode)) 1283 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1284 * // if ( target->i_sb == sb ){ 1285 * // use relative path? 1286 * // } 1287 * path_put(&path); 1288 * } 1289 */ 1290 } else if (S_ISREG(mode)) { 1291 if (sbi->options->sparse) { 1292 /* Sparsed regular file, cause option 'sparse'. */ 1293 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1294 FILE_ATTRIBUTE_ARCHIVE; 1295 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1296 /* Compressed regular file, if parent is compressed. */ 1297 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1298 } else { 1299 /* Regular file, default attributes. */ 1300 fa = FILE_ATTRIBUTE_ARCHIVE; 1301 } 1302 } else { 1303 fa = FILE_ATTRIBUTE_ARCHIVE; 1304 } 1305 1306 /* If option "hide_dot_files" then set hidden attribute for dot files. */ 1307 if (sbi->options->hide_dot_files && name->name[0] == '.') 1308 fa |= FILE_ATTRIBUTE_HIDDEN; 1309 1310 if (!(mode & 0222)) 1311 fa |= FILE_ATTRIBUTE_READONLY; 1312 1313 /* Allocate PATH_MAX bytes. */ 1314 new_de = __getname(); 1315 if (!new_de) { 1316 err = -ENOMEM; 1317 goto out1; 1318 } 1319 1320 if (unlikely(ntfs3_forced_shutdown(sb))) { 1321 err = -EIO; 1322 goto out2; 1323 } 1324 1325 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1326 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1327 1328 /* Step 1: allocate and fill new mft record. */ 1329 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1330 if (err) 1331 goto out2; 1332 1333 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); 1334 if (IS_ERR(ni)) { 1335 err = PTR_ERR(ni); 1336 ni = NULL; 1337 goto out3; 1338 } 1339 inode = &ni->vfs_inode; 1340 inode_init_owner(idmap, inode, dir, mode); 1341 mode = inode->i_mode; 1342 1343 ni->i_crtime = current_time(inode); 1344 1345 rec = ni->mi.mrec; 1346 rec->hard_links = cpu_to_le16(1); 1347 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1348 1349 /* Get default security id. */ 1350 sd = s_default_security; 1351 sd_size = sizeof(s_default_security); 1352 1353 if (is_ntfs3(sbi)) { 1354 security_id = dir_ni->std_security_id; 1355 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1356 security_id = sbi->security.def_security_id; 1357 1358 if (security_id == SECURITY_ID_INVALID && 1359 !ntfs_insert_security(sbi, sd, sd_size, 1360 &security_id, NULL)) 1361 sbi->security.def_security_id = security_id; 1362 } 1363 } 1364 1365 /* Insert standard info. */ 1366 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1367 1368 if (security_id == SECURITY_ID_INVALID) { 1369 dsize = sizeof(struct ATTR_STD_INFO); 1370 } else { 1371 dsize = sizeof(struct ATTR_STD_INFO5); 1372 std5->security_id = security_id; 1373 ni->std_security_id = security_id; 1374 } 1375 asize = SIZEOF_RESIDENT + dsize; 1376 1377 attr->type = ATTR_STD; 1378 attr->size = cpu_to_le32(asize); 1379 attr->id = cpu_to_le16(aid++); 1380 attr->res.data_off = SIZEOF_RESIDENT_LE; 1381 attr->res.data_size = cpu_to_le32(dsize); 1382 1383 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1384 kernel2nt(&ni->i_crtime); 1385 1386 std5->fa = ni->std_fa = fa; 1387 1388 attr = Add2Ptr(attr, asize); 1389 1390 /* Insert file name. */ 1391 err = fill_name_de(sbi, new_de, name, uni); 1392 if (err) 1393 goto out4; 1394 1395 mi_get_ref(&ni->mi, &new_de->ref); 1396 1397 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1398 1399 if (sbi->options->windows_names && 1400 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) { 1401 err = -EINVAL; 1402 goto out4; 1403 } 1404 1405 mi_get_ref(&dir_ni->mi, &fname->home); 1406 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1407 fname->dup.a_time = std5->cr_time; 1408 fname->dup.alloc_size = fname->dup.data_size = 0; 1409 fname->dup.fa = std5->fa; 1410 fname->dup.ea_size = fname->dup.reparse = 0; 1411 1412 dsize = le16_to_cpu(new_de->key_size); 1413 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1414 1415 attr->type = ATTR_NAME; 1416 attr->size = cpu_to_le32(asize); 1417 attr->res.data_off = SIZEOF_RESIDENT_LE; 1418 attr->res.flags = RESIDENT_FLAG_INDEXED; 1419 attr->id = cpu_to_le16(aid++); 1420 attr->res.data_size = cpu_to_le32(dsize); 1421 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1422 1423 attr = Add2Ptr(attr, asize); 1424 1425 if (security_id == SECURITY_ID_INVALID) { 1426 /* Insert security attribute. */ 1427 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1428 1429 attr->type = ATTR_SECURE; 1430 attr->size = cpu_to_le32(asize); 1431 attr->id = cpu_to_le16(aid++); 1432 attr->res.data_off = SIZEOF_RESIDENT_LE; 1433 attr->res.data_size = cpu_to_le32(sd_size); 1434 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1435 1436 attr = Add2Ptr(attr, asize); 1437 } 1438 1439 attr->id = cpu_to_le16(aid++); 1440 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1441 /* 1442 * Regular directory or symlink to directory. 1443 * Create root attribute. 1444 */ 1445 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1446 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1447 1448 attr->type = ATTR_ROOT; 1449 attr->size = cpu_to_le32(asize); 1450 1451 attr->name_len = ARRAY_SIZE(I30_NAME); 1452 attr->name_off = SIZEOF_RESIDENT_LE; 1453 attr->res.data_off = 1454 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1455 attr->res.data_size = cpu_to_le32(dsize); 1456 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1457 sizeof(I30_NAME)); 1458 1459 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1460 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1461 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); 1462 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1463 sizeof(struct NTFS_DE)); 1464 root->ihdr.total = root->ihdr.used; 1465 1466 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1467 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1468 e->flags = NTFS_IE_LAST; 1469 } else if (S_ISLNK(mode)) { 1470 /* 1471 * Symlink to file. 1472 * Create empty resident data attribute. 1473 */ 1474 asize = SIZEOF_RESIDENT; 1475 1476 /* Insert empty ATTR_DATA */ 1477 attr->type = ATTR_DATA; 1478 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1479 attr->name_off = SIZEOF_RESIDENT_LE; 1480 attr->res.data_off = SIZEOF_RESIDENT_LE; 1481 } else if (S_ISREG(mode)) { 1482 /* 1483 * Regular file. Create empty non resident data attribute. 1484 */ 1485 attr->type = ATTR_DATA; 1486 attr->non_res = 1; 1487 attr->nres.evcn = cpu_to_le64(-1ll); 1488 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1489 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1490 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1491 attr->flags = ATTR_FLAG_SPARSED; 1492 asize = SIZEOF_NONRESIDENT_EX + 8; 1493 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1494 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1495 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1496 attr->flags = ATTR_FLAG_COMPRESSED; 1497 attr->nres.c_unit = COMPRESSION_UNIT; 1498 asize = SIZEOF_NONRESIDENT_EX + 8; 1499 } else { 1500 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1501 attr->name_off = SIZEOF_NONRESIDENT_LE; 1502 asize = SIZEOF_NONRESIDENT + 8; 1503 } 1504 attr->nres.run_off = attr->name_off; 1505 } else { 1506 /* 1507 * Node. Create empty resident data attribute. 1508 */ 1509 attr->type = ATTR_DATA; 1510 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1511 attr->name_off = SIZEOF_RESIDENT_LE; 1512 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1513 attr->flags = ATTR_FLAG_SPARSED; 1514 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1515 attr->flags = ATTR_FLAG_COMPRESSED; 1516 attr->res.data_off = SIZEOF_RESIDENT_LE; 1517 asize = SIZEOF_RESIDENT; 1518 ni->ni_flags |= NI_FLAG_RESIDENT; 1519 } 1520 1521 if (S_ISDIR(mode)) { 1522 ni->ni_flags |= NI_FLAG_DIR; 1523 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1524 if (err) 1525 goto out4; 1526 } else if (S_ISLNK(mode)) { 1527 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1528 1529 if (IS_ERR(rp)) { 1530 err = PTR_ERR(rp); 1531 rp = NULL; 1532 goto out4; 1533 } 1534 1535 /* 1536 * Insert ATTR_REPARSE. 1537 */ 1538 attr = Add2Ptr(attr, asize); 1539 attr->type = ATTR_REPARSE; 1540 attr->id = cpu_to_le16(aid++); 1541 1542 /* Resident or non resident? */ 1543 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1544 t16 = PtrOffset(rec, attr); 1545 1546 /* 1547 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1548 * It is good idea to keep extened attributes resident. 1549 */ 1550 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1551 CLST alen; 1552 CLST clst = bytes_to_cluster(sbi, nsize); 1553 1554 /* Bytes per runs. */ 1555 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1556 1557 attr->non_res = 1; 1558 attr->nres.evcn = cpu_to_le64(clst - 1); 1559 attr->name_off = SIZEOF_NONRESIDENT_LE; 1560 attr->nres.run_off = attr->name_off; 1561 attr->nres.data_size = cpu_to_le64(nsize); 1562 attr->nres.valid_size = attr->nres.data_size; 1563 attr->nres.alloc_size = 1564 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1565 1566 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1567 clst, NULL, ALLOCATE_DEF, 1568 &alen, 0, NULL, NULL); 1569 if (err) 1570 goto out5; 1571 1572 err = run_pack(&ni->file.run, 0, clst, 1573 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1574 &vcn); 1575 if (err < 0) 1576 goto out5; 1577 1578 if (vcn != clst) { 1579 err = -EINVAL; 1580 goto out5; 1581 } 1582 1583 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1584 /* Write non resident data. */ 1585 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, 1586 nsize, 0); 1587 if (err) 1588 goto out5; 1589 } else { 1590 attr->res.data_off = SIZEOF_RESIDENT_LE; 1591 attr->res.data_size = cpu_to_le32(nsize); 1592 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1593 } 1594 /* Size of symlink equals the length of input string. */ 1595 inode->i_size = size; 1596 1597 attr->size = cpu_to_le32(asize); 1598 1599 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1600 &new_de->ref); 1601 if (err) 1602 goto out5; 1603 1604 rp_inserted = true; 1605 } 1606 1607 attr = Add2Ptr(attr, asize); 1608 attr->type = ATTR_END; 1609 1610 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1611 rec->next_attr_id = cpu_to_le16(aid); 1612 1613 inode->i_generation = le16_to_cpu(rec->seq); 1614 1615 if (S_ISDIR(mode)) { 1616 inode->i_op = &ntfs_dir_inode_operations; 1617 inode->i_fop = &ntfs_dir_operations; 1618 } else if (S_ISLNK(mode)) { 1619 inode->i_op = &ntfs_link_inode_operations; 1620 inode->i_fop = NULL; 1621 inode->i_mapping->a_ops = &ntfs_aops; 1622 inode->i_size = size; 1623 inode_nohighmem(inode); 1624 } else if (S_ISREG(mode)) { 1625 inode->i_op = &ntfs_file_inode_operations; 1626 inode->i_fop = &ntfs_file_operations; 1627 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 1628 &ntfs_aops; 1629 init_rwsem(&ni->file.run_lock); 1630 } else { 1631 inode->i_op = &ntfs_special_inode_operations; 1632 init_special_inode(inode, mode, dev); 1633 } 1634 1635 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1636 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1637 err = ntfs_init_acl(idmap, inode, dir); 1638 if (err) 1639 goto out5; 1640 } else 1641 #endif 1642 { 1643 inode->i_flags |= S_NOSEC; 1644 } 1645 1646 /* 1647 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. 1648 * The packed size of extended attribute is stored in direntry too. 1649 * 'fname' here points to inside new_de. 1650 */ 1651 ntfs_save_wsl_perm(inode, &fname->dup.ea_size); 1652 1653 /* 1654 * update ea_size in file_name attribute too. 1655 * Use ni_find_attr cause layout of MFT record may be changed 1656 * in ntfs_init_acl and ntfs_save_wsl_perm. 1657 */ 1658 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL); 1659 if (attr) { 1660 struct ATTR_FILE_NAME *fn; 1661 1662 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1663 if (fn) 1664 fn->dup.ea_size = fname->dup.ea_size; 1665 } 1666 1667 /* We do not need to update parent directory later */ 1668 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; 1669 1670 /* Step 2: Add new name in index. */ 1671 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1672 if (err) 1673 goto out6; 1674 1675 /* 1676 * Call 'd_instantiate' after inode->i_op is set 1677 * but before finish_open. 1678 */ 1679 d_instantiate(dentry, inode); 1680 1681 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ 1682 inode_set_atime_to_ts(inode, ni->i_crtime); 1683 inode_set_ctime_to_ts(inode, ni->i_crtime); 1684 inode_set_mtime_to_ts(inode, ni->i_crtime); 1685 inode_set_mtime_to_ts(dir, ni->i_crtime); 1686 inode_set_ctime_to_ts(dir, ni->i_crtime); 1687 1688 mark_inode_dirty(dir); 1689 mark_inode_dirty(inode); 1690 1691 /* Normal exit. */ 1692 goto out2; 1693 1694 out6: 1695 if (rp_inserted) 1696 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1697 1698 out5: 1699 if (!S_ISDIR(mode)) 1700 run_deallocate(sbi, &ni->file.run, false); 1701 1702 out4: 1703 clear_rec_inuse(rec); 1704 clear_nlink(inode); 1705 ni->mi.dirty = false; 1706 discard_new_inode(inode); 1707 out3: 1708 ntfs_mark_rec_free(sbi, ino, false); 1709 1710 out2: 1711 __putname(new_de); 1712 kfree(rp); 1713 1714 out1: 1715 if (!fnd) 1716 ni_unlock(dir_ni); 1717 1718 if (err) 1719 return ERR_PTR(err); 1720 1721 unlock_new_inode(inode); 1722 1723 return inode; 1724 } 1725 1726 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1727 { 1728 int err; 1729 struct ntfs_inode *ni = ntfs_i(inode); 1730 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1731 struct NTFS_DE *de; 1732 1733 /* Allocate PATH_MAX bytes. */ 1734 de = __getname(); 1735 if (!de) 1736 return -ENOMEM; 1737 1738 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1739 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1740 1741 /* Construct 'de'. */ 1742 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1743 if (err) 1744 goto out; 1745 1746 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1747 out: 1748 __putname(de); 1749 return err; 1750 } 1751 1752 /* 1753 * ntfs_unlink_inode 1754 * 1755 * inode_operations::unlink 1756 * inode_operations::rmdir 1757 */ 1758 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1759 { 1760 int err; 1761 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1762 struct inode *inode = d_inode(dentry); 1763 struct ntfs_inode *ni = ntfs_i(inode); 1764 struct ntfs_inode *dir_ni = ntfs_i(dir); 1765 struct NTFS_DE *de, *de2 = NULL; 1766 int undo_remove; 1767 1768 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1769 return -EINVAL; 1770 1771 /* Allocate PATH_MAX bytes. */ 1772 de = __getname(); 1773 if (!de) 1774 return -ENOMEM; 1775 1776 ni_lock(ni); 1777 1778 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1779 err = -ENOTEMPTY; 1780 goto out; 1781 } 1782 1783 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1784 if (err < 0) 1785 goto out; 1786 1787 undo_remove = 0; 1788 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1789 1790 if (!err) { 1791 drop_nlink(inode); 1792 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 1793 mark_inode_dirty(dir); 1794 inode_set_ctime_to_ts(inode, inode_get_ctime(dir)); 1795 if (inode->i_nlink) 1796 mark_inode_dirty(inode); 1797 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1798 _ntfs_bad_inode(inode); 1799 } else { 1800 if (ni_is_dirty(dir)) 1801 mark_inode_dirty(dir); 1802 if (ni_is_dirty(inode)) 1803 mark_inode_dirty(inode); 1804 } 1805 1806 out: 1807 ni_unlock(ni); 1808 __putname(de); 1809 return err; 1810 } 1811 1812 void ntfs_evict_inode(struct inode *inode) 1813 { 1814 truncate_inode_pages_final(&inode->i_data); 1815 1816 invalidate_inode_buffers(inode); 1817 clear_inode(inode); 1818 1819 ni_clear(ntfs_i(inode)); 1820 } 1821 1822 /* 1823 * ntfs_translate_junction 1824 * 1825 * Translate a Windows junction target to the Linux equivalent. 1826 * On junctions, targets are always absolute (they include the drive 1827 * letter). We have no way of knowing if the target is for the current 1828 * mounted device or not so we just assume it is. 1829 */ 1830 static int ntfs_translate_junction(const struct super_block *sb, 1831 const struct dentry *link_de, char *target, 1832 int target_len, int target_max) 1833 { 1834 int tl_len, err = target_len; 1835 char *link_path_buffer = NULL, *link_path; 1836 char *translated = NULL; 1837 char *target_start; 1838 int copy_len; 1839 1840 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); 1841 if (!link_path_buffer) { 1842 err = -ENOMEM; 1843 goto out; 1844 } 1845 /* Get link path, relative to mount point */ 1846 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); 1847 if (IS_ERR(link_path)) { 1848 ntfs_err(sb, "Error getting link path"); 1849 err = -EINVAL; 1850 goto out; 1851 } 1852 1853 translated = kmalloc(PATH_MAX, GFP_NOFS); 1854 if (!translated) { 1855 err = -ENOMEM; 1856 goto out; 1857 } 1858 1859 /* Make translated path a relative path to mount point */ 1860 strcpy(translated, "./"); 1861 ++link_path; /* Skip leading / */ 1862 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) { 1863 if (*link_path == '/') { 1864 if (PATH_MAX - tl_len < sizeof("../")) { 1865 ntfs_err(sb, 1866 "Link path %s has too many components", 1867 link_path); 1868 err = -EINVAL; 1869 goto out; 1870 } 1871 strcpy(translated + tl_len, "../"); 1872 tl_len += sizeof("../") - 1; 1873 } 1874 } 1875 1876 /* Skip drive letter */ 1877 target_start = target; 1878 while (*target_start && *target_start != ':') 1879 ++target_start; 1880 1881 if (!*target_start) { 1882 ntfs_err(sb, "Link target (%s) missing drive separator", 1883 target); 1884 err = -EINVAL; 1885 goto out; 1886 } 1887 1888 /* Skip drive separator and leading /, if exists */ 1889 target_start += 1 + (target_start[1] == '/'); 1890 copy_len = target_len - (target_start - target); 1891 1892 if (PATH_MAX - tl_len <= copy_len) { 1893 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)", 1894 target_start, PATH_MAX - tl_len, copy_len); 1895 err = -EINVAL; 1896 goto out; 1897 } 1898 1899 /* translated path has a trailing / and target_start does not */ 1900 strcpy(translated + tl_len, target_start); 1901 tl_len += copy_len; 1902 if (target_max <= tl_len) { 1903 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)", 1904 translated, target_max, tl_len); 1905 err = -EINVAL; 1906 goto out; 1907 } 1908 strcpy(target, translated); 1909 err = tl_len; 1910 1911 out: 1912 kfree(link_path_buffer); 1913 kfree(translated); 1914 return err; 1915 } 1916 1917 static noinline int ntfs_readlink_hlp(const struct dentry *link_de, 1918 struct inode *inode, char *buffer, 1919 int buflen) 1920 { 1921 int i, err = -EINVAL; 1922 struct ntfs_inode *ni = ntfs_i(inode); 1923 struct super_block *sb = inode->i_sb; 1924 struct ntfs_sb_info *sbi = sb->s_fs_info; 1925 u64 size; 1926 u16 ulen = 0; 1927 void *to_free = NULL; 1928 struct REPARSE_DATA_BUFFER *rp; 1929 const __le16 *uname; 1930 struct ATTRIB *attr; 1931 1932 /* Reparse data present. Try to parse it. */ 1933 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1934 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1935 1936 *buffer = 0; 1937 1938 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1939 if (!attr) 1940 goto out; 1941 1942 if (!attr->non_res) { 1943 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1944 if (!rp) 1945 goto out; 1946 size = le32_to_cpu(attr->res.data_size); 1947 } else { 1948 size = le64_to_cpu(attr->nres.data_size); 1949 rp = NULL; 1950 } 1951 1952 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1953 goto out; 1954 1955 if (!rp) { 1956 rp = kmalloc(size, GFP_NOFS); 1957 if (!rp) { 1958 err = -ENOMEM; 1959 goto out; 1960 } 1961 to_free = rp; 1962 /* Read into temporal buffer. */ 1963 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1964 if (err) 1965 goto out; 1966 } 1967 1968 /* Microsoft Tag. */ 1969 switch (rp->ReparseTag) { 1970 case IO_REPARSE_TAG_MOUNT_POINT: 1971 /* Mount points and junctions. */ 1972 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1973 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1974 MountPointReparseBuffer.PathBuffer)) 1975 goto out; 1976 uname = Add2Ptr(rp, 1977 offsetof(struct REPARSE_DATA_BUFFER, 1978 MountPointReparseBuffer.PathBuffer) + 1979 le16_to_cpu(rp->MountPointReparseBuffer 1980 .PrintNameOffset)); 1981 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1982 break; 1983 1984 case IO_REPARSE_TAG_SYMLINK: 1985 /* FolderSymbolicLink */ 1986 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1987 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1988 SymbolicLinkReparseBuffer.PathBuffer)) 1989 goto out; 1990 uname = Add2Ptr( 1991 rp, offsetof(struct REPARSE_DATA_BUFFER, 1992 SymbolicLinkReparseBuffer.PathBuffer) + 1993 le16_to_cpu(rp->SymbolicLinkReparseBuffer 1994 .PrintNameOffset)); 1995 ulen = le16_to_cpu( 1996 rp->SymbolicLinkReparseBuffer.PrintNameLength); 1997 break; 1998 1999 case IO_REPARSE_TAG_CLOUD: 2000 case IO_REPARSE_TAG_CLOUD_1: 2001 case IO_REPARSE_TAG_CLOUD_2: 2002 case IO_REPARSE_TAG_CLOUD_3: 2003 case IO_REPARSE_TAG_CLOUD_4: 2004 case IO_REPARSE_TAG_CLOUD_5: 2005 case IO_REPARSE_TAG_CLOUD_6: 2006 case IO_REPARSE_TAG_CLOUD_7: 2007 case IO_REPARSE_TAG_CLOUD_8: 2008 case IO_REPARSE_TAG_CLOUD_9: 2009 case IO_REPARSE_TAG_CLOUD_A: 2010 case IO_REPARSE_TAG_CLOUD_B: 2011 case IO_REPARSE_TAG_CLOUD_C: 2012 case IO_REPARSE_TAG_CLOUD_D: 2013 case IO_REPARSE_TAG_CLOUD_E: 2014 case IO_REPARSE_TAG_CLOUD_F: 2015 err = sizeof("OneDrive") - 1; 2016 if (err > buflen) 2017 err = buflen; 2018 memcpy(buffer, "OneDrive", err); 2019 goto out; 2020 2021 default: 2022 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 2023 /* Unknown Microsoft Tag. */ 2024 goto out; 2025 } 2026 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 2027 size <= sizeof(struct REPARSE_POINT)) { 2028 goto out; 2029 } 2030 2031 /* Users tag. */ 2032 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 2033 ulen = le16_to_cpu(rp->ReparseDataLength) - 2034 sizeof(struct REPARSE_POINT); 2035 } 2036 2037 /* Convert nlen from bytes to UNICODE chars. */ 2038 ulen >>= 1; 2039 2040 /* Check that name is available. */ 2041 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 2042 goto out; 2043 2044 /* If name is already zero terminated then truncate it now. */ 2045 if (!uname[ulen - 1]) 2046 ulen -= 1; 2047 2048 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 2049 2050 if (err < 0) 2051 goto out; 2052 2053 /* Translate Windows '\' into Linux '/'. */ 2054 for (i = 0; i < err; i++) { 2055 if (buffer[i] == '\\') 2056 buffer[i] = '/'; 2057 } 2058 2059 /* Always set last zero. */ 2060 buffer[err] = 0; 2061 2062 /* If this is a junction, translate the link target. */ 2063 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) 2064 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen); 2065 2066 out: 2067 kfree(to_free); 2068 return err; 2069 } 2070 2071 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 2072 struct delayed_call *done) 2073 { 2074 int err; 2075 char *ret; 2076 2077 if (!de) 2078 return ERR_PTR(-ECHILD); 2079 2080 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 2081 if (!ret) 2082 return ERR_PTR(-ENOMEM); 2083 2084 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE); 2085 if (err < 0) { 2086 kfree(ret); 2087 return ERR_PTR(err); 2088 } 2089 2090 set_delayed_call(done, kfree_link, ret); 2091 2092 return ret; 2093 } 2094 2095 // clang-format off 2096 const struct inode_operations ntfs_link_inode_operations = { 2097 .get_link = ntfs_get_link, 2098 .setattr = ntfs3_setattr, 2099 .listxattr = ntfs_listxattr, 2100 }; 2101 2102 const struct address_space_operations ntfs_aops = { 2103 .read_folio = ntfs_read_folio, 2104 .readahead = ntfs_readahead, 2105 .writepages = ntfs_writepages, 2106 .write_begin = ntfs_write_begin, 2107 .write_end = ntfs_write_end, 2108 .direct_IO = ntfs_direct_IO, 2109 .bmap = ntfs_bmap, 2110 .dirty_folio = block_dirty_folio, 2111 .migrate_folio = buffer_migrate_folio, 2112 .invalidate_folio = block_invalidate_folio, 2113 }; 2114 2115 const struct address_space_operations ntfs_aops_cmpr = { 2116 .read_folio = ntfs_read_folio, 2117 .readahead = ntfs_readahead, 2118 }; 2119 // clang-format on 2120