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