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/blkdev.h> 9 #include <linux/buffer_head.h> 10 #include <linux/fs.h> 11 #include <linux/iversion.h> 12 #include <linux/mpage.h> 13 #include <linux/namei.h> 14 #include <linux/nls.h> 15 #include <linux/uio.h> 16 #include <linux/writeback.h> 17 18 #include "debug.h" 19 #include "ntfs.h" 20 #include "ntfs_fs.h" 21 22 /* 23 * ntfs_read_mft 24 * 25 * reads record and parses MFT 26 */ 27 static struct inode *ntfs_read_mft(struct inode *inode, 28 const struct cpu_str *name, 29 const struct MFT_REF *ref) 30 { 31 int err = 0; 32 struct ntfs_inode *ni = ntfs_i(inode); 33 struct super_block *sb = inode->i_sb; 34 struct ntfs_sb_info *sbi = sb->s_fs_info; 35 mode_t mode = 0; 36 struct ATTR_STD_INFO5 *std5 = NULL; 37 struct ATTR_LIST_ENTRY *le; 38 struct ATTRIB *attr; 39 bool is_match = false; 40 bool is_root = false; 41 bool is_dir; 42 unsigned long ino = inode->i_ino; 43 u32 rp_fa = 0, asize, t32; 44 u16 roff, rsize, names = 0; 45 const struct ATTR_FILE_NAME *fname = NULL; 46 const struct INDEX_ROOT *root; 47 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes 48 u64 t64; 49 struct MFT_REC *rec; 50 struct runs_tree *run; 51 52 inode->i_op = NULL; 53 /* Setup 'uid' and 'gid' */ 54 inode->i_uid = sbi->options.fs_uid; 55 inode->i_gid = sbi->options.fs_gid; 56 57 err = mi_init(&ni->mi, sbi, ino); 58 if (err) 59 goto out; 60 61 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) { 62 t64 = sbi->mft.lbo >> sbi->cluster_bits; 63 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size); 64 sbi->mft.ni = ni; 65 init_rwsem(&ni->file.run_lock); 66 67 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) { 68 err = -ENOMEM; 69 goto out; 70 } 71 } 72 73 err = mi_read(&ni->mi, ino == MFT_REC_MFT); 74 75 if (err) 76 goto out; 77 78 rec = ni->mi.mrec; 79 80 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) { 81 ; 82 } else if (ref->seq != rec->seq) { 83 err = -EINVAL; 84 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino, 85 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq)); 86 goto out; 87 } else if (!is_rec_inuse(rec)) { 88 err = -EINVAL; 89 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino); 90 goto out; 91 } 92 93 if (le32_to_cpu(rec->total) != sbi->record_size) { 94 // bad inode? 95 err = -EINVAL; 96 goto out; 97 } 98 99 if (!is_rec_base(rec)) 100 goto Ok; 101 102 /* record should contain $I30 root */ 103 is_dir = rec->flags & RECORD_FLAG_DIR; 104 105 inode->i_generation = le16_to_cpu(rec->seq); 106 107 /* Enumerate all struct Attributes MFT */ 108 le = NULL; 109 attr = NULL; 110 111 /* 112 * to reduce tab pressure use goto instead of 113 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) )) 114 */ 115 next_attr: 116 run = NULL; 117 err = -EINVAL; 118 attr = ni_enum_attr_ex(ni, attr, &le, NULL); 119 if (!attr) 120 goto end_enum; 121 122 if (le && le->vcn) { 123 /* This is non primary attribute segment. Ignore if not MFT */ 124 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA) 125 goto next_attr; 126 127 run = &ni->file.run; 128 asize = le32_to_cpu(attr->size); 129 goto attr_unpack_run; 130 } 131 132 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off); 133 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size); 134 asize = le32_to_cpu(attr->size); 135 136 switch (attr->type) { 137 case ATTR_STD: 138 if (attr->non_res || 139 asize < sizeof(struct ATTR_STD_INFO) + roff || 140 rsize < sizeof(struct ATTR_STD_INFO)) 141 goto out; 142 143 if (std5) 144 goto next_attr; 145 146 std5 = Add2Ptr(attr, roff); 147 148 #ifdef STATX_BTIME 149 nt2kernel(std5->cr_time, &ni->i_crtime); 150 #endif 151 nt2kernel(std5->a_time, &inode->i_atime); 152 nt2kernel(std5->c_time, &inode->i_ctime); 153 nt2kernel(std5->m_time, &inode->i_mtime); 154 155 ni->std_fa = std5->fa; 156 157 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && 158 rsize >= sizeof(struct ATTR_STD_INFO5)) 159 ni->std_security_id = std5->security_id; 160 goto next_attr; 161 162 case ATTR_LIST: 163 if (attr->name_len || le || ino == MFT_REC_LOG) 164 goto out; 165 166 err = ntfs_load_attr_list(ni, attr); 167 if (err) 168 goto out; 169 170 le = NULL; 171 attr = NULL; 172 goto next_attr; 173 174 case ATTR_NAME: 175 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || 176 rsize < SIZEOF_ATTRIBUTE_FILENAME) 177 goto out; 178 179 fname = Add2Ptr(attr, roff); 180 if (fname->type == FILE_NAME_DOS) 181 goto next_attr; 182 183 names += 1; 184 if (name && name->len == fname->name_len && 185 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, 186 NULL, false)) 187 is_match = true; 188 189 goto next_attr; 190 191 case ATTR_DATA: 192 if (is_dir) { 193 /* ignore data attribute in dir record */ 194 goto next_attr; 195 } 196 197 if (ino == MFT_REC_BADCLUST && !attr->non_res) 198 goto next_attr; 199 200 if (attr->name_len && 201 ((ino != MFT_REC_BADCLUST || !attr->non_res || 202 attr->name_len != ARRAY_SIZE(BAD_NAME) || 203 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && 204 (ino != MFT_REC_SECURE || !attr->non_res || 205 attr->name_len != ARRAY_SIZE(SDS_NAME) || 206 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { 207 /* file contains stream attribute. ignore it */ 208 goto next_attr; 209 } 210 211 if (is_attr_sparsed(attr)) 212 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; 213 else 214 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; 215 216 if (is_attr_compressed(attr)) 217 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; 218 else 219 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; 220 221 if (is_attr_encrypted(attr)) 222 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; 223 else 224 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; 225 226 if (!attr->non_res) { 227 ni->i_valid = inode->i_size = rsize; 228 inode_set_bytes(inode, rsize); 229 t32 = asize; 230 } else { 231 t32 = le16_to_cpu(attr->nres.run_off); 232 } 233 234 mode = S_IFREG | (0777 & sbi->options.fs_fmask_inv); 235 236 if (!attr->non_res) { 237 ni->ni_flags |= NI_FLAG_RESIDENT; 238 goto next_attr; 239 } 240 241 inode_set_bytes(inode, attr_ondisk_size(attr)); 242 243 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 244 inode->i_size = le64_to_cpu(attr->nres.data_size); 245 if (!attr->nres.alloc_size) 246 goto next_attr; 247 248 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run 249 : &ni->file.run; 250 break; 251 252 case ATTR_ROOT: 253 if (attr->non_res) 254 goto out; 255 256 root = Add2Ptr(attr, roff); 257 is_root = true; 258 259 if (attr->name_len != ARRAY_SIZE(I30_NAME) || 260 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 261 goto next_attr; 262 263 if (root->type != ATTR_NAME || 264 root->rule != NTFS_COLLATION_TYPE_FILENAME) 265 goto out; 266 267 if (!is_dir) 268 goto next_attr; 269 270 ni->ni_flags |= NI_FLAG_DIR; 271 272 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 273 if (err) 274 goto out; 275 276 mode = sb->s_root 277 ? (S_IFDIR | (0777 & sbi->options.fs_dmask_inv)) 278 : (S_IFDIR | 0777); 279 goto next_attr; 280 281 case ATTR_ALLOC: 282 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || 283 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 284 goto next_attr; 285 286 inode->i_size = le64_to_cpu(attr->nres.data_size); 287 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 288 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); 289 290 run = &ni->dir.alloc_run; 291 break; 292 293 case ATTR_BITMAP: 294 if (ino == MFT_REC_MFT) { 295 if (!attr->non_res) 296 goto out; 297 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 298 /* 0x20000000 = 2^32 / 8 */ 299 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) 300 goto out; 301 #endif 302 run = &sbi->mft.bitmap.run; 303 break; 304 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && 305 !memcmp(attr_name(attr), I30_NAME, 306 sizeof(I30_NAME)) && 307 attr->non_res) { 308 run = &ni->dir.bitmap_run; 309 break; 310 } 311 goto next_attr; 312 313 case ATTR_REPARSE: 314 if (attr->name_len) 315 goto next_attr; 316 317 rp_fa = ni_parse_reparse(ni, attr, &rp); 318 switch (rp_fa) { 319 case REPARSE_LINK: 320 if (!attr->non_res) { 321 inode->i_size = rsize; 322 inode_set_bytes(inode, rsize); 323 t32 = asize; 324 } else { 325 inode->i_size = 326 le64_to_cpu(attr->nres.data_size); 327 t32 = le16_to_cpu(attr->nres.run_off); 328 } 329 330 /* Looks like normal symlink */ 331 ni->i_valid = inode->i_size; 332 333 /* Clear directory bit */ 334 if (ni->ni_flags & NI_FLAG_DIR) { 335 indx_clear(&ni->dir); 336 memset(&ni->dir, 0, sizeof(ni->dir)); 337 ni->ni_flags &= ~NI_FLAG_DIR; 338 } else { 339 run_close(&ni->file.run); 340 } 341 mode = S_IFLNK | 0777; 342 is_dir = false; 343 if (attr->non_res) { 344 run = &ni->file.run; 345 goto attr_unpack_run; // double break 346 } 347 break; 348 349 case REPARSE_COMPRESSED: 350 break; 351 352 case REPARSE_DEDUPLICATED: 353 break; 354 } 355 goto next_attr; 356 357 case ATTR_EA_INFO: 358 if (!attr->name_len && 359 resident_data_ex(attr, sizeof(struct EA_INFO))) { 360 ni->ni_flags |= NI_FLAG_EA; 361 /* 362 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode 363 */ 364 inode->i_mode = mode; 365 ntfs_get_wsl_perm(inode); 366 mode = inode->i_mode; 367 } 368 goto next_attr; 369 370 default: 371 goto next_attr; 372 } 373 374 attr_unpack_run: 375 roff = le16_to_cpu(attr->nres.run_off); 376 377 t64 = le64_to_cpu(attr->nres.svcn); 378 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), 379 t64, Add2Ptr(attr, roff), asize - roff); 380 if (err < 0) 381 goto out; 382 err = 0; 383 goto next_attr; 384 385 end_enum: 386 387 if (!std5) 388 goto out; 389 390 if (!is_match && name) { 391 /* reuse rec as buffer for ascii name */ 392 err = -ENOENT; 393 goto out; 394 } 395 396 if (std5->fa & FILE_ATTRIBUTE_READONLY) 397 mode &= ~0222; 398 399 if (!names) { 400 err = -EINVAL; 401 goto out; 402 } 403 404 set_nlink(inode, names); 405 406 if (S_ISDIR(mode)) { 407 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; 408 409 /* 410 * dot and dot-dot should be included in count but was not 411 * included in enumeration. 412 * Usually a hard links to directories are disabled 413 */ 414 inode->i_op = &ntfs_dir_inode_operations; 415 inode->i_fop = &ntfs_dir_operations; 416 ni->i_valid = 0; 417 } else if (S_ISLNK(mode)) { 418 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 419 inode->i_op = &ntfs_link_inode_operations; 420 inode->i_fop = NULL; 421 inode_nohighmem(inode); // ?? 422 } else if (S_ISREG(mode)) { 423 ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY; 424 inode->i_op = &ntfs_file_inode_operations; 425 inode->i_fop = &ntfs_file_operations; 426 inode->i_mapping->a_ops = 427 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops; 428 if (ino != MFT_REC_MFT) 429 init_rwsem(&ni->file.run_lock); 430 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || 431 S_ISSOCK(mode)) { 432 inode->i_op = &ntfs_special_inode_operations; 433 init_special_inode(inode, mode, inode->i_rdev); 434 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && 435 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { 436 /* Records in $Extend are not a files or general directories */ 437 } else { 438 err = -EINVAL; 439 goto out; 440 } 441 442 if ((sbi->options.sys_immutable && 443 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 444 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 445 inode->i_flags |= S_IMMUTABLE; 446 } else { 447 inode->i_flags &= ~S_IMMUTABLE; 448 } 449 450 inode->i_mode = mode; 451 if (!(ni->ni_flags & NI_FLAG_EA)) { 452 /* if no xattr then no security (stored in xattr) */ 453 inode->i_flags |= S_NOSEC; 454 } 455 456 Ok: 457 if (ino == MFT_REC_MFT && !sb->s_root) 458 sbi->mft.ni = NULL; 459 460 unlock_new_inode(inode); 461 462 return inode; 463 464 out: 465 if (ino == MFT_REC_MFT && !sb->s_root) 466 sbi->mft.ni = NULL; 467 468 iget_failed(inode); 469 return ERR_PTR(err); 470 } 471 472 /* returns 1 if match */ 473 static int ntfs_test_inode(struct inode *inode, void *data) 474 { 475 struct MFT_REF *ref = data; 476 477 return ino_get(ref) == inode->i_ino; 478 } 479 480 static int ntfs_set_inode(struct inode *inode, void *data) 481 { 482 const struct MFT_REF *ref = data; 483 484 inode->i_ino = ino_get(ref); 485 return 0; 486 } 487 488 struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 489 const struct cpu_str *name) 490 { 491 struct inode *inode; 492 493 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 494 (void *)ref); 495 if (unlikely(!inode)) 496 return ERR_PTR(-ENOMEM); 497 498 /* If this is a freshly allocated inode, need to read it now. */ 499 if (inode->i_state & I_NEW) 500 inode = ntfs_read_mft(inode, name, ref); 501 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 502 /* inode overlaps? */ 503 make_bad_inode(inode); 504 } 505 506 return inode; 507 } 508 509 enum get_block_ctx { 510 GET_BLOCK_GENERAL = 0, 511 GET_BLOCK_WRITE_BEGIN = 1, 512 GET_BLOCK_DIRECT_IO_R = 2, 513 GET_BLOCK_DIRECT_IO_W = 3, 514 GET_BLOCK_BMAP = 4, 515 }; 516 517 static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 518 struct buffer_head *bh, int create, 519 enum get_block_ctx ctx) 520 { 521 struct super_block *sb = inode->i_sb; 522 struct ntfs_sb_info *sbi = sb->s_fs_info; 523 struct ntfs_inode *ni = ntfs_i(inode); 524 struct page *page = bh->b_page; 525 u8 cluster_bits = sbi->cluster_bits; 526 u32 block_size = sb->s_blocksize; 527 u64 bytes, lbo, valid; 528 u32 off; 529 int err; 530 CLST vcn, lcn, len; 531 bool new; 532 533 /*clear previous state*/ 534 clear_buffer_new(bh); 535 clear_buffer_uptodate(bh); 536 537 /* direct write uses 'create=0'*/ 538 if (!create && vbo >= ni->i_valid) { 539 /* out of valid */ 540 return 0; 541 } 542 543 if (vbo >= inode->i_size) { 544 /* out of size */ 545 return 0; 546 } 547 548 if (is_resident(ni)) { 549 ni_lock(ni); 550 err = attr_data_read_resident(ni, page); 551 ni_unlock(ni); 552 553 if (!err) 554 set_buffer_uptodate(bh); 555 bh->b_size = block_size; 556 return err; 557 } 558 559 vcn = vbo >> cluster_bits; 560 off = vbo & sbi->cluster_mask; 561 new = false; 562 563 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL); 564 if (err) 565 goto out; 566 567 if (!len) 568 return 0; 569 570 bytes = ((u64)len << cluster_bits) - off; 571 572 if (lcn == SPARSE_LCN) { 573 if (!create) { 574 if (bh->b_size > bytes) 575 bh->b_size = bytes; 576 return 0; 577 } 578 WARN_ON(1); 579 } 580 581 if (new) { 582 set_buffer_new(bh); 583 if ((len << cluster_bits) > block_size) 584 ntfs_sparse_cluster(inode, page, vcn, len); 585 } 586 587 lbo = ((u64)lcn << cluster_bits) + off; 588 589 set_buffer_mapped(bh); 590 bh->b_bdev = sb->s_bdev; 591 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 592 593 valid = ni->i_valid; 594 595 if (ctx == GET_BLOCK_DIRECT_IO_W) { 596 /*ntfs_direct_IO will update ni->i_valid */ 597 if (vbo >= valid) 598 set_buffer_new(bh); 599 } else if (create) { 600 /*normal write*/ 601 if (bytes > bh->b_size) 602 bytes = bh->b_size; 603 604 if (vbo >= valid) 605 set_buffer_new(bh); 606 607 if (vbo + bytes > valid) { 608 ni->i_valid = vbo + bytes; 609 mark_inode_dirty(inode); 610 } 611 } else if (vbo >= valid) { 612 /* read out of valid data*/ 613 /* should never be here 'cause already checked */ 614 clear_buffer_mapped(bh); 615 } else if (vbo + bytes <= valid) { 616 /* normal read */ 617 } else if (vbo + block_size <= valid) { 618 /* normal short read */ 619 bytes = block_size; 620 } else { 621 /* 622 * read across valid size: vbo < valid && valid < vbo + block_size 623 */ 624 bytes = block_size; 625 626 if (page) { 627 u32 voff = valid - vbo; 628 629 bh->b_size = block_size; 630 off = vbo & (PAGE_SIZE - 1); 631 set_bh_page(bh, page, off); 632 ll_rw_block(REQ_OP_READ, 0, 1, &bh); 633 wait_on_buffer(bh); 634 if (!buffer_uptodate(bh)) { 635 err = -EIO; 636 goto out; 637 } 638 zero_user_segment(page, off + voff, off + block_size); 639 } 640 } 641 642 if (bh->b_size > bytes) 643 bh->b_size = bytes; 644 645 #ifndef __LP64__ 646 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 647 static_assert(sizeof(size_t) < sizeof(loff_t)); 648 if (bytes > 0x40000000u) 649 bh->b_size = 0x40000000u; 650 } 651 #endif 652 653 return 0; 654 655 out: 656 return err; 657 } 658 659 int ntfs_get_block(struct inode *inode, sector_t vbn, 660 struct buffer_head *bh_result, int create) 661 { 662 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 663 bh_result, create, GET_BLOCK_GENERAL); 664 } 665 666 static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 667 struct buffer_head *bh_result, int create) 668 { 669 return ntfs_get_block_vbo(inode, 670 (u64)vsn << inode->i_sb->s_blocksize_bits, 671 bh_result, create, GET_BLOCK_BMAP); 672 } 673 674 static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 675 { 676 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 677 } 678 679 static int ntfs_readpage(struct file *file, struct page *page) 680 { 681 int err; 682 struct address_space *mapping = page->mapping; 683 struct inode *inode = mapping->host; 684 struct ntfs_inode *ni = ntfs_i(inode); 685 686 if (is_resident(ni)) { 687 ni_lock(ni); 688 err = attr_data_read_resident(ni, page); 689 ni_unlock(ni); 690 if (err != E_NTFS_NONRESIDENT) { 691 unlock_page(page); 692 return err; 693 } 694 } 695 696 if (is_compressed(ni)) { 697 ni_lock(ni); 698 err = ni_readpage_cmpr(ni, page); 699 ni_unlock(ni); 700 return err; 701 } 702 703 /* normal + sparse files */ 704 return mpage_readpage(page, ntfs_get_block); 705 } 706 707 static void ntfs_readahead(struct readahead_control *rac) 708 { 709 struct address_space *mapping = rac->mapping; 710 struct inode *inode = mapping->host; 711 struct ntfs_inode *ni = ntfs_i(inode); 712 u64 valid; 713 loff_t pos; 714 715 if (is_resident(ni)) { 716 /* no readahead for resident */ 717 return; 718 } 719 720 if (is_compressed(ni)) { 721 /* no readahead for compressed */ 722 return; 723 } 724 725 valid = ni->i_valid; 726 pos = readahead_pos(rac); 727 728 if (valid < i_size_read(inode) && pos <= valid && 729 valid < pos + readahead_length(rac)) { 730 /* range cross 'valid'. read it page by page */ 731 return; 732 } 733 734 mpage_readahead(rac, ntfs_get_block); 735 } 736 737 static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 738 struct buffer_head *bh_result, int create) 739 { 740 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 741 bh_result, create, GET_BLOCK_DIRECT_IO_R); 742 } 743 744 static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 745 struct buffer_head *bh_result, int create) 746 { 747 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 748 bh_result, create, GET_BLOCK_DIRECT_IO_W); 749 } 750 751 static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 752 { 753 struct file *file = iocb->ki_filp; 754 struct address_space *mapping = file->f_mapping; 755 struct inode *inode = mapping->host; 756 struct ntfs_inode *ni = ntfs_i(inode); 757 loff_t vbo = iocb->ki_pos; 758 loff_t end; 759 int wr = iov_iter_rw(iter) & WRITE; 760 loff_t valid; 761 ssize_t ret; 762 763 if (is_resident(ni)) { 764 /*switch to buffered write*/ 765 ret = 0; 766 goto out; 767 } 768 769 ret = blockdev_direct_IO(iocb, inode, iter, 770 wr ? ntfs_get_block_direct_IO_W 771 : ntfs_get_block_direct_IO_R); 772 773 if (ret <= 0) 774 goto out; 775 776 end = vbo + ret; 777 valid = ni->i_valid; 778 if (wr) { 779 if (end > valid && !S_ISBLK(inode->i_mode)) { 780 ni->i_valid = end; 781 mark_inode_dirty(inode); 782 } 783 } else if (vbo < valid && valid < end) { 784 /* fix page */ 785 iov_iter_revert(iter, end - valid); 786 iov_iter_zero(end - valid, iter); 787 } 788 789 out: 790 return ret; 791 } 792 793 int ntfs_set_size(struct inode *inode, u64 new_size) 794 { 795 struct super_block *sb = inode->i_sb; 796 struct ntfs_sb_info *sbi = sb->s_fs_info; 797 struct ntfs_inode *ni = ntfs_i(inode); 798 int err; 799 800 /* Check for maximum file size */ 801 if (is_sparsed(ni) || is_compressed(ni)) { 802 if (new_size > sbi->maxbytes_sparse) { 803 err = -EFBIG; 804 goto out; 805 } 806 } else if (new_size > sbi->maxbytes) { 807 err = -EFBIG; 808 goto out; 809 } 810 811 ni_lock(ni); 812 down_write(&ni->file.run_lock); 813 814 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 815 &ni->i_valid, true, NULL); 816 817 up_write(&ni->file.run_lock); 818 ni_unlock(ni); 819 820 mark_inode_dirty(inode); 821 822 out: 823 return err; 824 } 825 826 static int ntfs_writepage(struct page *page, struct writeback_control *wbc) 827 { 828 struct address_space *mapping = page->mapping; 829 struct inode *inode = mapping->host; 830 struct ntfs_inode *ni = ntfs_i(inode); 831 int err; 832 833 if (is_resident(ni)) { 834 ni_lock(ni); 835 err = attr_data_write_resident(ni, page); 836 ni_unlock(ni); 837 if (err != E_NTFS_NONRESIDENT) { 838 unlock_page(page); 839 return err; 840 } 841 } 842 843 return block_write_full_page(page, ntfs_get_block, wbc); 844 } 845 846 static int ntfs_writepages(struct address_space *mapping, 847 struct writeback_control *wbc) 848 { 849 struct inode *inode = mapping->host; 850 struct ntfs_inode *ni = ntfs_i(inode); 851 /* redirect call to 'ntfs_writepage' for resident files*/ 852 get_block_t *get_block = is_resident(ni) ? NULL : &ntfs_get_block; 853 854 return mpage_writepages(mapping, wbc, get_block); 855 } 856 857 static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 858 struct buffer_head *bh_result, int create) 859 { 860 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 861 bh_result, create, GET_BLOCK_WRITE_BEGIN); 862 } 863 864 static int ntfs_write_begin(struct file *file, struct address_space *mapping, 865 loff_t pos, u32 len, u32 flags, struct page **pagep, 866 void **fsdata) 867 { 868 int err; 869 struct inode *inode = mapping->host; 870 struct ntfs_inode *ni = ntfs_i(inode); 871 872 *pagep = NULL; 873 if (is_resident(ni)) { 874 struct page *page = grab_cache_page_write_begin( 875 mapping, pos >> PAGE_SHIFT, flags); 876 877 if (!page) { 878 err = -ENOMEM; 879 goto out; 880 } 881 882 ni_lock(ni); 883 err = attr_data_read_resident(ni, page); 884 ni_unlock(ni); 885 886 if (!err) { 887 *pagep = page; 888 goto out; 889 } 890 unlock_page(page); 891 put_page(page); 892 893 if (err != E_NTFS_NONRESIDENT) 894 goto out; 895 } 896 897 err = block_write_begin(mapping, pos, len, flags, pagep, 898 ntfs_get_block_write_begin); 899 900 out: 901 return err; 902 } 903 904 /* address_space_operations::write_end */ 905 static int ntfs_write_end(struct file *file, struct address_space *mapping, 906 loff_t pos, u32 len, u32 copied, struct page *page, 907 void *fsdata) 908 909 { 910 struct inode *inode = mapping->host; 911 struct ntfs_inode *ni = ntfs_i(inode); 912 u64 valid = ni->i_valid; 913 bool dirty = false; 914 int err; 915 916 if (is_resident(ni)) { 917 ni_lock(ni); 918 err = attr_data_write_resident(ni, page); 919 ni_unlock(ni); 920 if (!err) { 921 dirty = true; 922 /* clear any buffers in page*/ 923 if (page_has_buffers(page)) { 924 struct buffer_head *head, *bh; 925 926 bh = head = page_buffers(page); 927 do { 928 clear_buffer_dirty(bh); 929 clear_buffer_mapped(bh); 930 set_buffer_uptodate(bh); 931 } while (head != (bh = bh->b_this_page)); 932 } 933 SetPageUptodate(page); 934 err = copied; 935 } 936 unlock_page(page); 937 put_page(page); 938 } else { 939 err = generic_write_end(file, mapping, pos, len, copied, page, 940 fsdata); 941 } 942 943 if (err >= 0) { 944 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 945 inode->i_ctime = inode->i_mtime = current_time(inode); 946 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 947 dirty = true; 948 } 949 950 if (valid != ni->i_valid) { 951 /* ni->i_valid is changed in ntfs_get_block_vbo */ 952 dirty = true; 953 } 954 955 if (dirty) 956 mark_inode_dirty(inode); 957 } 958 959 return err; 960 } 961 962 int reset_log_file(struct inode *inode) 963 { 964 int err; 965 loff_t pos = 0; 966 u32 log_size = inode->i_size; 967 struct address_space *mapping = inode->i_mapping; 968 969 for (;;) { 970 u32 len; 971 void *kaddr; 972 struct page *page; 973 974 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 975 976 err = block_write_begin(mapping, pos, len, 0, &page, 977 ntfs_get_block_write_begin); 978 if (err) 979 goto out; 980 981 kaddr = kmap_atomic(page); 982 memset(kaddr, -1, len); 983 kunmap_atomic(kaddr); 984 flush_dcache_page(page); 985 986 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 987 if (err < 0) 988 goto out; 989 pos += len; 990 991 if (pos >= log_size) 992 break; 993 balance_dirty_pages_ratelimited(mapping); 994 } 995 out: 996 mark_inode_dirty_sync(inode); 997 998 return err; 999 } 1000 1001 int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1002 { 1003 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1004 } 1005 1006 int ntfs_sync_inode(struct inode *inode) 1007 { 1008 return _ni_write_inode(inode, 1); 1009 } 1010 1011 /* 1012 * helper function for ntfs_flush_inodes. This writes both the inode 1013 * and the file data blocks, waiting for in flight data blocks before 1014 * the start of the call. It does not wait for any io started 1015 * during the call 1016 */ 1017 static int writeback_inode(struct inode *inode) 1018 { 1019 int ret = sync_inode_metadata(inode, 0); 1020 1021 if (!ret) 1022 ret = filemap_fdatawrite(inode->i_mapping); 1023 return ret; 1024 } 1025 1026 /* 1027 * write data and metadata corresponding to i1 and i2. The io is 1028 * started but we do not wait for any of it to finish. 1029 * 1030 * filemap_flush is used for the block device, so if there is a dirty 1031 * page for a block already in flight, we will not wait and start the 1032 * io over again 1033 */ 1034 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1035 struct inode *i2) 1036 { 1037 int ret = 0; 1038 1039 if (i1) 1040 ret = writeback_inode(i1); 1041 if (!ret && i2) 1042 ret = writeback_inode(i2); 1043 if (!ret) 1044 ret = filemap_flush(sb->s_bdev->bd_inode->i_mapping); 1045 return ret; 1046 } 1047 1048 int inode_write_data(struct inode *inode, const void *data, size_t bytes) 1049 { 1050 pgoff_t idx; 1051 1052 /* Write non resident data */ 1053 for (idx = 0; bytes; idx++) { 1054 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1055 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1056 1057 if (IS_ERR(page)) 1058 return PTR_ERR(page); 1059 1060 lock_page(page); 1061 WARN_ON(!PageUptodate(page)); 1062 ClearPageUptodate(page); 1063 1064 memcpy(page_address(page), data, op); 1065 1066 flush_dcache_page(page); 1067 SetPageUptodate(page); 1068 unlock_page(page); 1069 1070 ntfs_unmap_page(page); 1071 1072 bytes -= op; 1073 data = Add2Ptr(data, PAGE_SIZE); 1074 } 1075 return 0; 1076 } 1077 1078 /* 1079 * number of bytes to for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1080 * for unicode string of 'uni_len' length 1081 */ 1082 static inline u32 ntfs_reparse_bytes(u32 uni_len) 1083 { 1084 /* header + unicode string + decorated unicode string */ 1085 return sizeof(short) * (2 * uni_len + 4) + 1086 offsetof(struct REPARSE_DATA_BUFFER, 1087 SymbolicLinkReparseBuffer.PathBuffer); 1088 } 1089 1090 static struct REPARSE_DATA_BUFFER * 1091 ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1092 u32 size, u16 *nsize) 1093 { 1094 int i, err; 1095 struct REPARSE_DATA_BUFFER *rp; 1096 __le16 *rp_name; 1097 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1098 1099 rp = ntfs_zalloc(ntfs_reparse_bytes(2 * size + 2)); 1100 if (!rp) 1101 return ERR_PTR(-ENOMEM); 1102 1103 rs = &rp->SymbolicLinkReparseBuffer; 1104 rp_name = rs->PathBuffer; 1105 1106 /* Convert link name to utf16 */ 1107 err = ntfs_nls_to_utf16(sbi, symname, size, 1108 (struct cpu_str *)(rp_name - 1), 2 * size, 1109 UTF16_LITTLE_ENDIAN); 1110 if (err < 0) 1111 goto out; 1112 1113 /* err = the length of unicode name of symlink */ 1114 *nsize = ntfs_reparse_bytes(err); 1115 1116 if (*nsize > sbi->reparse.max_size) { 1117 err = -EFBIG; 1118 goto out; 1119 } 1120 1121 /* translate linux '/' into windows '\' */ 1122 for (i = 0; i < err; i++) { 1123 if (rp_name[i] == cpu_to_le16('/')) 1124 rp_name[i] = cpu_to_le16('\\'); 1125 } 1126 1127 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1128 rp->ReparseDataLength = 1129 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1130 SymbolicLinkReparseBuffer)); 1131 1132 /* PrintName + SubstituteName */ 1133 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1134 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1135 rs->PrintNameLength = rs->SubstituteNameOffset; 1136 1137 /* 1138 * TODO: use relative path if possible to allow windows to parse this path 1139 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE) 1140 */ 1141 rs->Flags = 0; 1142 1143 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1144 1145 /* decorate SubstituteName */ 1146 rp_name += err; 1147 rp_name[0] = cpu_to_le16('\\'); 1148 rp_name[1] = cpu_to_le16('?'); 1149 rp_name[2] = cpu_to_le16('?'); 1150 rp_name[3] = cpu_to_le16('\\'); 1151 1152 return rp; 1153 out: 1154 ntfs_free(rp); 1155 return ERR_PTR(err); 1156 } 1157 1158 struct inode *ntfs_create_inode(struct user_namespace *mnt_userns, 1159 struct inode *dir, struct dentry *dentry, 1160 const struct cpu_str *uni, umode_t mode, 1161 dev_t dev, const char *symname, u32 size, 1162 struct ntfs_fnd *fnd) 1163 { 1164 int err; 1165 struct super_block *sb = dir->i_sb; 1166 struct ntfs_sb_info *sbi = sb->s_fs_info; 1167 const struct qstr *name = &dentry->d_name; 1168 CLST ino = 0; 1169 struct ntfs_inode *dir_ni = ntfs_i(dir); 1170 struct ntfs_inode *ni = NULL; 1171 struct inode *inode = NULL; 1172 struct ATTRIB *attr; 1173 struct ATTR_STD_INFO5 *std5; 1174 struct ATTR_FILE_NAME *fname; 1175 struct MFT_REC *rec; 1176 u32 asize, dsize, sd_size; 1177 enum FILE_ATTRIBUTE fa; 1178 __le32 security_id = SECURITY_ID_INVALID; 1179 CLST vcn; 1180 const void *sd; 1181 u16 t16, nsize = 0, aid = 0; 1182 struct INDEX_ROOT *root, *dir_root; 1183 struct NTFS_DE *e, *new_de = NULL; 1184 struct REPARSE_DATA_BUFFER *rp = NULL; 1185 bool rp_inserted = false; 1186 1187 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1188 if (!dir_root) 1189 return ERR_PTR(-EINVAL); 1190 1191 if (S_ISDIR(mode)) { 1192 /* use parent's directory attributes */ 1193 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1194 FILE_ATTRIBUTE_ARCHIVE; 1195 /* 1196 * By default child directory inherits parent attributes 1197 * root directory is hidden + system 1198 * Make an exception for children in root 1199 */ 1200 if (dir->i_ino == MFT_REC_ROOT) 1201 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1202 } else if (S_ISLNK(mode)) { 1203 /* It is good idea that link should be the same type (file/dir) as target */ 1204 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1205 1206 /* 1207 * linux: there are dir/file/symlink and so on 1208 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1209 * It is good idea to create: 1210 * dir + reparse if 'symname' points to directory 1211 * or 1212 * file + reparse if 'symname' points to file 1213 * Unfortunately kern_path hangs if symname contains 'dir' 1214 */ 1215 1216 /* 1217 * struct path path; 1218 * 1219 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1220 * struct inode *target = d_inode(path.dentry); 1221 * 1222 * if (S_ISDIR(target->i_mode)) 1223 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1224 * // if ( target->i_sb == sb ){ 1225 * // use relative path? 1226 * // } 1227 * path_put(&path); 1228 * } 1229 */ 1230 } else if (S_ISREG(mode)) { 1231 if (sbi->options.sparse) { 1232 /* sparsed regular file, cause option 'sparse' */ 1233 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1234 FILE_ATTRIBUTE_ARCHIVE; 1235 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1236 /* compressed regular file, if parent is compressed */ 1237 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1238 } else { 1239 /* regular file, default attributes */ 1240 fa = FILE_ATTRIBUTE_ARCHIVE; 1241 } 1242 } else { 1243 fa = FILE_ATTRIBUTE_ARCHIVE; 1244 } 1245 1246 if (!(mode & 0222)) 1247 fa |= FILE_ATTRIBUTE_READONLY; 1248 1249 /* allocate PATH_MAX bytes */ 1250 new_de = __getname(); 1251 if (!new_de) { 1252 err = -ENOMEM; 1253 goto out1; 1254 } 1255 1256 /*mark rw ntfs as dirty. it will be cleared at umount*/ 1257 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1258 1259 /* Step 1: allocate and fill new mft record */ 1260 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1261 if (err) 1262 goto out2; 1263 1264 ni = ntfs_new_inode(sbi, ino, fa & FILE_ATTRIBUTE_DIRECTORY); 1265 if (IS_ERR(ni)) { 1266 err = PTR_ERR(ni); 1267 ni = NULL; 1268 goto out3; 1269 } 1270 inode = &ni->vfs_inode; 1271 inode_init_owner(mnt_userns, inode, dir, mode); 1272 1273 inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime = 1274 current_time(inode); 1275 1276 rec = ni->mi.mrec; 1277 rec->hard_links = cpu_to_le16(1); 1278 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1279 1280 /* Get default security id */ 1281 sd = s_default_security; 1282 sd_size = sizeof(s_default_security); 1283 1284 if (is_ntfs3(sbi)) { 1285 security_id = dir_ni->std_security_id; 1286 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1287 security_id = sbi->security.def_security_id; 1288 1289 if (security_id == SECURITY_ID_INVALID && 1290 !ntfs_insert_security(sbi, sd, sd_size, 1291 &security_id, NULL)) 1292 sbi->security.def_security_id = security_id; 1293 } 1294 } 1295 1296 /* Insert standard info */ 1297 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1298 1299 if (security_id == SECURITY_ID_INVALID) { 1300 dsize = sizeof(struct ATTR_STD_INFO); 1301 } else { 1302 dsize = sizeof(struct ATTR_STD_INFO5); 1303 std5->security_id = security_id; 1304 ni->std_security_id = security_id; 1305 } 1306 asize = SIZEOF_RESIDENT + dsize; 1307 1308 attr->type = ATTR_STD; 1309 attr->size = cpu_to_le32(asize); 1310 attr->id = cpu_to_le16(aid++); 1311 attr->res.data_off = SIZEOF_RESIDENT_LE; 1312 attr->res.data_size = cpu_to_le32(dsize); 1313 1314 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1315 kernel2nt(&inode->i_atime); 1316 1317 ni->std_fa = fa; 1318 std5->fa = fa; 1319 1320 attr = Add2Ptr(attr, asize); 1321 1322 /* Insert file name */ 1323 err = fill_name_de(sbi, new_de, name, uni); 1324 if (err) 1325 goto out4; 1326 1327 mi_get_ref(&ni->mi, &new_de->ref); 1328 1329 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1330 mi_get_ref(&dir_ni->mi, &fname->home); 1331 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1332 fname->dup.a_time = std5->cr_time; 1333 fname->dup.alloc_size = fname->dup.data_size = 0; 1334 fname->dup.fa = std5->fa; 1335 fname->dup.ea_size = fname->dup.reparse = 0; 1336 1337 dsize = le16_to_cpu(new_de->key_size); 1338 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1339 1340 attr->type = ATTR_NAME; 1341 attr->size = cpu_to_le32(asize); 1342 attr->res.data_off = SIZEOF_RESIDENT_LE; 1343 attr->res.flags = RESIDENT_FLAG_INDEXED; 1344 attr->id = cpu_to_le16(aid++); 1345 attr->res.data_size = cpu_to_le32(dsize); 1346 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1347 1348 attr = Add2Ptr(attr, asize); 1349 1350 if (security_id == SECURITY_ID_INVALID) { 1351 /* Insert security attribute */ 1352 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1353 1354 attr->type = ATTR_SECURE; 1355 attr->size = cpu_to_le32(asize); 1356 attr->id = cpu_to_le16(aid++); 1357 attr->res.data_off = SIZEOF_RESIDENT_LE; 1358 attr->res.data_size = cpu_to_le32(sd_size); 1359 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1360 1361 attr = Add2Ptr(attr, asize); 1362 } 1363 1364 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1365 /* 1366 * regular directory or symlink to directory 1367 * Create root attribute 1368 */ 1369 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1370 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1371 1372 attr->type = ATTR_ROOT; 1373 attr->size = cpu_to_le32(asize); 1374 attr->id = cpu_to_le16(aid++); 1375 1376 attr->name_len = ARRAY_SIZE(I30_NAME); 1377 attr->name_off = SIZEOF_RESIDENT_LE; 1378 attr->res.data_off = 1379 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1380 attr->res.data_size = cpu_to_le32(dsize); 1381 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1382 sizeof(I30_NAME)); 1383 1384 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1385 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1386 root->ihdr.de_off = 1387 cpu_to_le32(sizeof(struct INDEX_HDR)); // 0x10 1388 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1389 sizeof(struct NTFS_DE)); 1390 root->ihdr.total = root->ihdr.used; 1391 1392 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1393 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1394 e->flags = NTFS_IE_LAST; 1395 } else if (S_ISLNK(mode)) { 1396 /* 1397 * symlink to file 1398 * Create empty resident data attribute 1399 */ 1400 asize = SIZEOF_RESIDENT; 1401 1402 /* insert empty ATTR_DATA */ 1403 attr->type = ATTR_DATA; 1404 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1405 attr->id = cpu_to_le16(aid++); 1406 attr->name_off = SIZEOF_RESIDENT_LE; 1407 attr->res.data_off = SIZEOF_RESIDENT_LE; 1408 } else { 1409 /* 1410 * regular file or node 1411 */ 1412 attr->type = ATTR_DATA; 1413 attr->id = cpu_to_le16(aid++); 1414 1415 if (S_ISREG(mode)) { 1416 /* Create empty non resident data attribute */ 1417 attr->non_res = 1; 1418 attr->nres.evcn = cpu_to_le64(-1ll); 1419 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1420 attr->size = 1421 cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1422 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1423 attr->flags = ATTR_FLAG_SPARSED; 1424 asize = SIZEOF_NONRESIDENT_EX + 8; 1425 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1426 attr->size = 1427 cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1428 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1429 attr->flags = ATTR_FLAG_COMPRESSED; 1430 attr->nres.c_unit = COMPRESSION_UNIT; 1431 asize = SIZEOF_NONRESIDENT_EX + 8; 1432 } else { 1433 attr->size = 1434 cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1435 attr->name_off = SIZEOF_NONRESIDENT_LE; 1436 asize = SIZEOF_NONRESIDENT + 8; 1437 } 1438 attr->nres.run_off = attr->name_off; 1439 } else { 1440 /* Create empty resident data attribute */ 1441 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1442 attr->name_off = SIZEOF_RESIDENT_LE; 1443 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1444 attr->flags = ATTR_FLAG_SPARSED; 1445 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1446 attr->flags = ATTR_FLAG_COMPRESSED; 1447 attr->res.data_off = SIZEOF_RESIDENT_LE; 1448 asize = SIZEOF_RESIDENT; 1449 ni->ni_flags |= NI_FLAG_RESIDENT; 1450 } 1451 } 1452 1453 if (S_ISDIR(mode)) { 1454 ni->ni_flags |= NI_FLAG_DIR; 1455 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1456 if (err) 1457 goto out4; 1458 } else if (S_ISLNK(mode)) { 1459 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1460 1461 if (IS_ERR(rp)) { 1462 err = PTR_ERR(rp); 1463 rp = NULL; 1464 goto out4; 1465 } 1466 1467 /* 1468 * Insert ATTR_REPARSE 1469 */ 1470 attr = Add2Ptr(attr, asize); 1471 attr->type = ATTR_REPARSE; 1472 attr->id = cpu_to_le16(aid++); 1473 1474 /* resident or non resident? */ 1475 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1476 t16 = PtrOffset(rec, attr); 1477 1478 if (asize + t16 + 8 > sbi->record_size) { 1479 CLST alen; 1480 CLST clst = bytes_to_cluster(sbi, nsize); 1481 1482 /* bytes per runs */ 1483 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1484 1485 attr->non_res = 1; 1486 attr->nres.evcn = cpu_to_le64(clst - 1); 1487 attr->name_off = SIZEOF_NONRESIDENT_LE; 1488 attr->nres.run_off = attr->name_off; 1489 attr->nres.data_size = cpu_to_le64(nsize); 1490 attr->nres.valid_size = attr->nres.data_size; 1491 attr->nres.alloc_size = 1492 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1493 1494 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1495 clst, NULL, 0, &alen, 0, 1496 NULL); 1497 if (err) 1498 goto out5; 1499 1500 err = run_pack(&ni->file.run, 0, clst, 1501 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1502 &vcn); 1503 if (err < 0) 1504 goto out5; 1505 1506 if (vcn != clst) { 1507 err = -EINVAL; 1508 goto out5; 1509 } 1510 1511 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1512 inode->i_size = nsize; 1513 } else { 1514 attr->res.data_off = SIZEOF_RESIDENT_LE; 1515 attr->res.data_size = cpu_to_le32(nsize); 1516 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1517 inode->i_size = nsize; 1518 nsize = 0; 1519 } 1520 1521 attr->size = cpu_to_le32(asize); 1522 1523 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1524 &new_de->ref); 1525 if (err) 1526 goto out5; 1527 1528 rp_inserted = true; 1529 } 1530 1531 attr = Add2Ptr(attr, asize); 1532 attr->type = ATTR_END; 1533 1534 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1535 rec->next_attr_id = cpu_to_le16(aid); 1536 1537 /* Step 2: Add new name in index */ 1538 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd); 1539 if (err) 1540 goto out6; 1541 1542 /* Update current directory record */ 1543 mark_inode_dirty(dir); 1544 1545 inode->i_generation = le16_to_cpu(rec->seq); 1546 1547 dir->i_mtime = dir->i_ctime = inode->i_atime; 1548 1549 if (S_ISDIR(mode)) { 1550 if (dir->i_mode & S_ISGID) 1551 mode |= S_ISGID; 1552 inode->i_op = &ntfs_dir_inode_operations; 1553 inode->i_fop = &ntfs_dir_operations; 1554 } else if (S_ISLNK(mode)) { 1555 inode->i_op = &ntfs_link_inode_operations; 1556 inode->i_fop = NULL; 1557 inode->i_mapping->a_ops = &ntfs_aops; 1558 } else if (S_ISREG(mode)) { 1559 inode->i_op = &ntfs_file_inode_operations; 1560 inode->i_fop = &ntfs_file_operations; 1561 inode->i_mapping->a_ops = 1562 is_compressed(ni) ? &ntfs_aops_cmpr : &ntfs_aops; 1563 init_rwsem(&ni->file.run_lock); 1564 } else { 1565 inode->i_op = &ntfs_special_inode_operations; 1566 init_special_inode(inode, mode, dev); 1567 } 1568 1569 #ifdef CONFIG_NTFS3_FS_POSIX_ACL 1570 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1571 err = ntfs_init_acl(mnt_userns, inode, dir); 1572 if (err) 1573 goto out6; 1574 } else 1575 #endif 1576 { 1577 inode->i_flags |= S_NOSEC; 1578 } 1579 1580 /* Write non resident data */ 1581 if (nsize) { 1582 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, nsize); 1583 if (err) 1584 goto out7; 1585 } 1586 1587 /* call 'd_instantiate' after inode->i_op is set but before finish_open */ 1588 d_instantiate(dentry, inode); 1589 1590 ntfs_save_wsl_perm(inode); 1591 mark_inode_dirty(inode); 1592 mark_inode_dirty(dir); 1593 1594 /* normal exit */ 1595 goto out2; 1596 1597 out7: 1598 1599 /* undo 'indx_insert_entry' */ 1600 indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1, 1601 le16_to_cpu(new_de->key_size), sbi); 1602 out6: 1603 if (rp_inserted) 1604 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1605 1606 out5: 1607 if (S_ISDIR(mode) || run_is_empty(&ni->file.run)) 1608 goto out4; 1609 1610 run_deallocate(sbi, &ni->file.run, false); 1611 1612 out4: 1613 clear_rec_inuse(rec); 1614 clear_nlink(inode); 1615 ni->mi.dirty = false; 1616 discard_new_inode(inode); 1617 out3: 1618 ntfs_mark_rec_free(sbi, ino); 1619 1620 out2: 1621 __putname(new_de); 1622 ntfs_free(rp); 1623 1624 out1: 1625 if (err) 1626 return ERR_PTR(err); 1627 1628 unlock_new_inode(inode); 1629 1630 return inode; 1631 } 1632 1633 int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1634 { 1635 int err; 1636 struct inode *dir = d_inode(dentry->d_parent); 1637 struct ntfs_inode *dir_ni = ntfs_i(dir); 1638 struct ntfs_inode *ni = ntfs_i(inode); 1639 struct super_block *sb = inode->i_sb; 1640 struct ntfs_sb_info *sbi = sb->s_fs_info; 1641 const struct qstr *name = &dentry->d_name; 1642 struct NTFS_DE *new_de = NULL; 1643 struct ATTR_FILE_NAME *fname; 1644 struct ATTRIB *attr; 1645 u16 key_size; 1646 struct INDEX_ROOT *dir_root; 1647 1648 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1649 if (!dir_root) 1650 return -EINVAL; 1651 1652 /* allocate PATH_MAX bytes */ 1653 new_de = __getname(); 1654 if (!new_de) 1655 return -ENOMEM; 1656 1657 /*mark rw ntfs as dirty. it will be cleared at umount*/ 1658 ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_DIRTY); 1659 1660 // Insert file name 1661 err = fill_name_de(sbi, new_de, name, NULL); 1662 if (err) 1663 goto out; 1664 1665 key_size = le16_to_cpu(new_de->key_size); 1666 err = ni_insert_resident(ni, key_size, ATTR_NAME, NULL, 0, &attr, NULL); 1667 if (err) 1668 goto out; 1669 1670 mi_get_ref(&ni->mi, &new_de->ref); 1671 1672 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1673 mi_get_ref(&dir_ni->mi, &fname->home); 1674 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1675 fname->dup.a_time = kernel2nt(&inode->i_ctime); 1676 fname->dup.alloc_size = fname->dup.data_size = 0; 1677 fname->dup.fa = ni->std_fa; 1678 fname->dup.ea_size = fname->dup.reparse = 0; 1679 1680 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, key_size); 1681 1682 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, NULL); 1683 if (err) 1684 goto out; 1685 1686 le16_add_cpu(&ni->mi.mrec->hard_links, 1); 1687 ni->mi.dirty = true; 1688 1689 out: 1690 __putname(new_de); 1691 return err; 1692 } 1693 1694 /* 1695 * ntfs_unlink_inode 1696 * 1697 * inode_operations::unlink 1698 * inode_operations::rmdir 1699 */ 1700 int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1701 { 1702 int err; 1703 struct super_block *sb = dir->i_sb; 1704 struct ntfs_sb_info *sbi = sb->s_fs_info; 1705 struct inode *inode = d_inode(dentry); 1706 struct ntfs_inode *ni = ntfs_i(inode); 1707 const struct qstr *name = &dentry->d_name; 1708 struct ntfs_inode *dir_ni = ntfs_i(dir); 1709 struct ntfs_index *indx = &dir_ni->dir; 1710 struct cpu_str *uni = NULL; 1711 struct ATTR_FILE_NAME *fname; 1712 u8 name_type; 1713 struct ATTR_LIST_ENTRY *le; 1714 struct MFT_REF ref; 1715 bool is_dir = S_ISDIR(inode->i_mode); 1716 struct INDEX_ROOT *dir_root; 1717 1718 dir_root = indx_get_root(indx, dir_ni, NULL, NULL); 1719 if (!dir_root) 1720 return -EINVAL; 1721 1722 ni_lock(ni); 1723 1724 if (is_dir && !dir_is_empty(inode)) { 1725 err = -ENOTEMPTY; 1726 goto out1; 1727 } 1728 1729 if (ntfs_is_meta_file(sbi, inode->i_ino)) { 1730 err = -EINVAL; 1731 goto out1; 1732 } 1733 1734 /* allocate PATH_MAX bytes */ 1735 uni = __getname(); 1736 if (!uni) { 1737 err = -ENOMEM; 1738 goto out1; 1739 } 1740 1741 /* Convert input string to unicode */ 1742 err = ntfs_nls_to_utf16(sbi, name->name, name->len, uni, NTFS_NAME_LEN, 1743 UTF16_HOST_ENDIAN); 1744 if (err < 0) 1745 goto out2; 1746 1747 /*mark rw ntfs as dirty. it will be cleared at umount*/ 1748 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1749 1750 /* find name in record */ 1751 mi_get_ref(&dir_ni->mi, &ref); 1752 1753 le = NULL; 1754 fname = ni_fname_name(ni, uni, &ref, &le); 1755 if (!fname) { 1756 err = -ENOENT; 1757 goto out3; 1758 } 1759 1760 name_type = paired_name(fname->type); 1761 1762 err = indx_delete_entry(indx, dir_ni, fname, fname_full_size(fname), 1763 sbi); 1764 if (err) 1765 goto out3; 1766 1767 /* Then remove name from mft */ 1768 ni_remove_attr_le(ni, attr_from_name(fname), le); 1769 1770 le16_add_cpu(&ni->mi.mrec->hard_links, -1); 1771 ni->mi.dirty = true; 1772 1773 if (name_type != FILE_NAME_POSIX) { 1774 /* Now we should delete name by type */ 1775 fname = ni_fname_type(ni, name_type, &le); 1776 if (fname) { 1777 err = indx_delete_entry(indx, dir_ni, fname, 1778 fname_full_size(fname), sbi); 1779 if (err) 1780 goto out3; 1781 1782 ni_remove_attr_le(ni, attr_from_name(fname), le); 1783 1784 le16_add_cpu(&ni->mi.mrec->hard_links, -1); 1785 } 1786 } 1787 out3: 1788 switch (err) { 1789 case 0: 1790 drop_nlink(inode); 1791 break; 1792 case -ENOTEMPTY: 1793 case -ENOSPC: 1794 case -EROFS: 1795 break; 1796 default: 1797 make_bad_inode(inode); 1798 } 1799 1800 dir->i_mtime = dir->i_ctime = current_time(dir); 1801 mark_inode_dirty(dir); 1802 inode->i_ctime = dir->i_ctime; 1803 if (inode->i_nlink) 1804 mark_inode_dirty(inode); 1805 1806 out2: 1807 __putname(uni); 1808 out1: 1809 ni_unlock(ni); 1810 return err; 1811 } 1812 1813 void ntfs_evict_inode(struct inode *inode) 1814 { 1815 truncate_inode_pages_final(&inode->i_data); 1816 1817 if (inode->i_nlink) 1818 _ni_write_inode(inode, inode_needs_sync(inode)); 1819 1820 invalidate_inode_buffers(inode); 1821 clear_inode(inode); 1822 1823 ni_clear(ntfs_i(inode)); 1824 } 1825 1826 static noinline int ntfs_readlink_hlp(struct inode *inode, char *buffer, 1827 int buflen) 1828 { 1829 int i, err = 0; 1830 struct ntfs_inode *ni = ntfs_i(inode); 1831 struct super_block *sb = inode->i_sb; 1832 struct ntfs_sb_info *sbi = sb->s_fs_info; 1833 u64 i_size = inode->i_size; 1834 u16 nlen = 0; 1835 void *to_free = NULL; 1836 struct REPARSE_DATA_BUFFER *rp; 1837 struct le_str *uni; 1838 struct ATTRIB *attr; 1839 1840 /* Reparse data present. Try to parse it */ 1841 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1842 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1843 1844 *buffer = 0; 1845 1846 /* Read into temporal buffer */ 1847 if (i_size > sbi->reparse.max_size || i_size <= sizeof(u32)) { 1848 err = -EINVAL; 1849 goto out; 1850 } 1851 1852 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1853 if (!attr) { 1854 err = -EINVAL; 1855 goto out; 1856 } 1857 1858 if (!attr->non_res) { 1859 rp = resident_data_ex(attr, i_size); 1860 if (!rp) { 1861 err = -EINVAL; 1862 goto out; 1863 } 1864 } else { 1865 rp = ntfs_malloc(i_size); 1866 if (!rp) { 1867 err = -ENOMEM; 1868 goto out; 1869 } 1870 to_free = rp; 1871 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, i_size, NULL); 1872 if (err) 1873 goto out; 1874 } 1875 1876 err = -EINVAL; 1877 1878 /* Microsoft Tag */ 1879 switch (rp->ReparseTag) { 1880 case IO_REPARSE_TAG_MOUNT_POINT: 1881 /* Mount points and junctions */ 1882 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1883 if (i_size <= offsetof(struct REPARSE_DATA_BUFFER, 1884 MountPointReparseBuffer.PathBuffer)) 1885 goto out; 1886 uni = Add2Ptr(rp, 1887 offsetof(struct REPARSE_DATA_BUFFER, 1888 MountPointReparseBuffer.PathBuffer) + 1889 le16_to_cpu(rp->MountPointReparseBuffer 1890 .PrintNameOffset) - 1891 2); 1892 nlen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1893 break; 1894 1895 case IO_REPARSE_TAG_SYMLINK: 1896 /* FolderSymbolicLink */ 1897 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1898 if (i_size <= offsetof(struct REPARSE_DATA_BUFFER, 1899 SymbolicLinkReparseBuffer.PathBuffer)) 1900 goto out; 1901 uni = Add2Ptr(rp, 1902 offsetof(struct REPARSE_DATA_BUFFER, 1903 SymbolicLinkReparseBuffer.PathBuffer) + 1904 le16_to_cpu(rp->SymbolicLinkReparseBuffer 1905 .PrintNameOffset) - 1906 2); 1907 nlen = le16_to_cpu( 1908 rp->SymbolicLinkReparseBuffer.PrintNameLength); 1909 break; 1910 1911 case IO_REPARSE_TAG_CLOUD: 1912 case IO_REPARSE_TAG_CLOUD_1: 1913 case IO_REPARSE_TAG_CLOUD_2: 1914 case IO_REPARSE_TAG_CLOUD_3: 1915 case IO_REPARSE_TAG_CLOUD_4: 1916 case IO_REPARSE_TAG_CLOUD_5: 1917 case IO_REPARSE_TAG_CLOUD_6: 1918 case IO_REPARSE_TAG_CLOUD_7: 1919 case IO_REPARSE_TAG_CLOUD_8: 1920 case IO_REPARSE_TAG_CLOUD_9: 1921 case IO_REPARSE_TAG_CLOUD_A: 1922 case IO_REPARSE_TAG_CLOUD_B: 1923 case IO_REPARSE_TAG_CLOUD_C: 1924 case IO_REPARSE_TAG_CLOUD_D: 1925 case IO_REPARSE_TAG_CLOUD_E: 1926 case IO_REPARSE_TAG_CLOUD_F: 1927 err = sizeof("OneDrive") - 1; 1928 if (err > buflen) 1929 err = buflen; 1930 memcpy(buffer, "OneDrive", err); 1931 goto out; 1932 1933 default: 1934 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 1935 /* unknown Microsoft Tag */ 1936 goto out; 1937 } 1938 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 1939 i_size <= sizeof(struct REPARSE_POINT)) { 1940 goto out; 1941 } 1942 1943 /* Users tag */ 1944 uni = Add2Ptr(rp, sizeof(struct REPARSE_POINT) - 2); 1945 nlen = le16_to_cpu(rp->ReparseDataLength) - 1946 sizeof(struct REPARSE_POINT); 1947 } 1948 1949 /* Convert nlen from bytes to UNICODE chars */ 1950 nlen >>= 1; 1951 1952 /* Check that name is available */ 1953 if (!nlen || &uni->name[nlen] > (__le16 *)Add2Ptr(rp, i_size)) 1954 goto out; 1955 1956 /* If name is already zero terminated then truncate it now */ 1957 if (!uni->name[nlen - 1]) 1958 nlen -= 1; 1959 uni->len = nlen; 1960 1961 err = ntfs_utf16_to_nls(sbi, uni, buffer, buflen); 1962 1963 if (err < 0) 1964 goto out; 1965 1966 /* translate windows '\' into linux '/' */ 1967 for (i = 0; i < err; i++) { 1968 if (buffer[i] == '\\') 1969 buffer[i] = '/'; 1970 } 1971 1972 /* Always set last zero */ 1973 buffer[err] = 0; 1974 out: 1975 ntfs_free(to_free); 1976 return err; 1977 } 1978 1979 static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 1980 struct delayed_call *done) 1981 { 1982 int err; 1983 char *ret; 1984 1985 if (!de) 1986 return ERR_PTR(-ECHILD); 1987 1988 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 1989 if (!ret) 1990 return ERR_PTR(-ENOMEM); 1991 1992 err = ntfs_readlink_hlp(inode, ret, PAGE_SIZE); 1993 if (err < 0) { 1994 kfree(ret); 1995 return ERR_PTR(err); 1996 } 1997 1998 set_delayed_call(done, kfree_link, ret); 1999 2000 return ret; 2001 } 2002 2003 // clang-format off 2004 const struct inode_operations ntfs_link_inode_operations = { 2005 .get_link = ntfs_get_link, 2006 .setattr = ntfs3_setattr, 2007 .listxattr = ntfs_listxattr, 2008 .permission = ntfs_permission, 2009 .get_acl = ntfs_get_acl, 2010 .set_acl = ntfs_set_acl, 2011 }; 2012 2013 const struct address_space_operations ntfs_aops = { 2014 .readpage = ntfs_readpage, 2015 .readahead = ntfs_readahead, 2016 .writepage = ntfs_writepage, 2017 .writepages = ntfs_writepages, 2018 .write_begin = ntfs_write_begin, 2019 .write_end = ntfs_write_end, 2020 .direct_IO = ntfs_direct_IO, 2021 .bmap = ntfs_bmap, 2022 .set_page_dirty = __set_page_dirty_buffers, 2023 }; 2024 2025 const struct address_space_operations ntfs_aops_cmpr = { 2026 .readpage = ntfs_readpage, 2027 .readahead = ntfs_readahead, 2028 }; 2029 // clang-format on 2030