1// SPDX-License-Identifier: GPL-2.0 2/* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 */ 7 8#include <linux/buffer_head.h> 9#include <linux/fs.h> 10#include <linux/mpage.h> 11#include <linux/namei.h> 12#include <linux/nls.h> 13#include <linux/uio.h> 14#include <linux/writeback.h> 15 16#include "debug.h" 17#include "ntfs.h" 18#include "ntfs_fs.h" 19 20/* 21 * ntfs_read_mft - Read record and parses MFT. 22 */ 23static struct inode *ntfs_read_mft(struct inode *inode, 24 const struct cpu_str *name, 25 const struct MFT_REF *ref) 26{ 27 int err = 0; 28 struct ntfs_inode *ni = ntfs_i(inode); 29 struct super_block *sb = inode->i_sb; 30 struct ntfs_sb_info *sbi = sb->s_fs_info; 31 mode_t mode = 0; 32 struct ATTR_STD_INFO5 *std5 = NULL; 33 struct ATTR_LIST_ENTRY *le; 34 struct ATTRIB *attr; 35 bool is_match = false; 36 bool is_root = false; 37 bool is_dir; 38 unsigned long ino = inode->i_ino; 39 u32 rp_fa = 0, asize, t32; 40 u16 roff, rsize, names = 0; 41 const struct ATTR_FILE_NAME *fname = NULL; 42 const struct INDEX_ROOT *root; 43 struct REPARSE_DATA_BUFFER rp; // 0x18 bytes 44 u64 t64; 45 struct MFT_REC *rec; 46 struct runs_tree *run; 47 struct timespec64 ts; 48 49 inode->i_op = NULL; 50 /* Setup 'uid' and 'gid' */ 51 inode->i_uid = sbi->options->fs_uid; 52 inode->i_gid = sbi->options->fs_gid; 53 54 err = mi_init(&ni->mi, sbi, ino); 55 if (err) 56 goto out; 57 58 if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) { 59 t64 = sbi->mft.lbo >> sbi->cluster_bits; 60 t32 = bytes_to_cluster(sbi, MFT_REC_VOL * sbi->record_size); 61 sbi->mft.ni = ni; 62 init_rwsem(&ni->file.run_lock); 63 64 if (!run_add_entry(&ni->file.run, 0, t64, t32, true)) { 65 err = -ENOMEM; 66 goto out; 67 } 68 } 69 70 err = mi_read(&ni->mi, ino == MFT_REC_MFT); 71 72 if (err) 73 goto out; 74 75 rec = ni->mi.mrec; 76 77 if (sbi->flags & NTFS_FLAGS_LOG_REPLAYING) { 78 ; 79 } else if (ref->seq != rec->seq) { 80 err = -EINVAL; 81 ntfs_err(sb, "MFT: r=%lx, expect seq=%x instead of %x!", ino, 82 le16_to_cpu(ref->seq), le16_to_cpu(rec->seq)); 83 goto out; 84 } else if (!is_rec_inuse(rec)) { 85 err = -ESTALE; 86 ntfs_err(sb, "Inode r=%x is not in use!", (u32)ino); 87 goto out; 88 } 89 90 if (le32_to_cpu(rec->total) != sbi->record_size) { 91 /* Bad inode? */ 92 err = -EINVAL; 93 goto out; 94 } 95 96 if (!is_rec_base(rec)) { 97 err = -EINVAL; 98 goto out; 99 } 100 101 /* Record should contain $I30 root. */ 102 is_dir = rec->flags & RECORD_FLAG_DIR; 103 104 /* MFT_REC_MFT is not a dir */ 105 if (is_dir && ino == MFT_REC_MFT) { 106 err = -EINVAL; 107 goto out; 108 } 109 110 inode->i_generation = le16_to_cpu(rec->seq); 111 112 /* Enumerate all struct Attributes MFT. */ 113 le = NULL; 114 attr = NULL; 115 116 /* 117 * To reduce tab pressure use goto instead of 118 * while( (attr = ni_enum_attr_ex(ni, attr, &le, NULL) )) 119 */ 120next_attr: 121 run = NULL; 122 err = -EINVAL; 123 attr = ni_enum_attr_ex(ni, attr, &le, NULL); 124 if (!attr) 125 goto end_enum; 126 127 if (le && le->vcn) { 128 /* This is non primary attribute segment. Ignore if not MFT. */ 129 if (ino != MFT_REC_MFT || attr->type != ATTR_DATA) 130 goto next_attr; 131 132 run = &ni->file.run; 133 asize = le32_to_cpu(attr->size); 134 goto attr_unpack_run; 135 } 136 137 roff = attr->non_res ? 0 : le16_to_cpu(attr->res.data_off); 138 rsize = attr->non_res ? 0 : le32_to_cpu(attr->res.data_size); 139 asize = le32_to_cpu(attr->size); 140 141 /* 142 * Really this check was done in 'ni_enum_attr_ex' -> ... 'mi_enum_attr'. 143 * There not critical to check this case again 144 */ 145 if (attr->name_len && 146 sizeof(short) * attr->name_len + le16_to_cpu(attr->name_off) > 147 asize) 148 goto out; 149 150 if (attr->non_res) { 151 t64 = le64_to_cpu(attr->nres.alloc_size); 152 if (le64_to_cpu(attr->nres.data_size) > t64 || 153 le64_to_cpu(attr->nres.valid_size) > t64) 154 goto out; 155 } 156 157 switch (attr->type) { 158 case ATTR_STD: 159 if (attr->non_res || 160 asize < sizeof(struct ATTR_STD_INFO) + roff || 161 rsize < sizeof(struct ATTR_STD_INFO)) 162 goto out; 163 164 if (std5) 165 goto next_attr; 166 167 std5 = Add2Ptr(attr, roff); 168 169#ifdef STATX_BTIME 170 nt2kernel(std5->cr_time, &ni->i_crtime); 171#endif 172 nt2kernel(std5->a_time, &ts); 173 inode_set_atime_to_ts(inode, ts); 174 nt2kernel(std5->c_time, &ts); 175 inode_set_ctime_to_ts(inode, ts); 176 nt2kernel(std5->m_time, &ts); 177 inode_set_mtime_to_ts(inode, ts); 178 179 ni->std_fa = std5->fa; 180 181 if (asize >= sizeof(struct ATTR_STD_INFO5) + roff && 182 rsize >= sizeof(struct ATTR_STD_INFO5)) 183 ni->std_security_id = std5->security_id; 184 goto next_attr; 185 186 case ATTR_LIST: 187 if (attr->name_len || le || ino == MFT_REC_LOG) 188 goto out; 189 190 err = ntfs_load_attr_list(ni, attr); 191 if (err) 192 goto out; 193 194 le = NULL; 195 attr = NULL; 196 goto next_attr; 197 198 case ATTR_NAME: 199 if (attr->non_res || asize < SIZEOF_ATTRIBUTE_FILENAME + roff || 200 rsize < SIZEOF_ATTRIBUTE_FILENAME) 201 goto out; 202 203 fname = Add2Ptr(attr, roff); 204 if (fname->type == FILE_NAME_DOS) 205 goto next_attr; 206 207 names += 1; 208 if (name && name->len == fname->name_len && 209 !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, 210 NULL, false)) 211 is_match = true; 212 213 goto next_attr; 214 215 case ATTR_DATA: 216 if (is_dir) { 217 /* Ignore data attribute in dir record. */ 218 goto next_attr; 219 } 220 221 if (ino == MFT_REC_BADCLUST && !attr->non_res) 222 goto next_attr; 223 224 if (attr->name_len && 225 ((ino != MFT_REC_BADCLUST || !attr->non_res || 226 attr->name_len != ARRAY_SIZE(BAD_NAME) || 227 memcmp(attr_name(attr), BAD_NAME, sizeof(BAD_NAME))) && 228 (ino != MFT_REC_SECURE || !attr->non_res || 229 attr->name_len != ARRAY_SIZE(SDS_NAME) || 230 memcmp(attr_name(attr), SDS_NAME, sizeof(SDS_NAME))))) { 231 /* File contains stream attribute. Ignore it. */ 232 goto next_attr; 233 } 234 235 if (is_attr_sparsed(attr)) 236 ni->std_fa |= FILE_ATTRIBUTE_SPARSE_FILE; 237 else 238 ni->std_fa &= ~FILE_ATTRIBUTE_SPARSE_FILE; 239 240 if (is_attr_compressed(attr)) 241 ni->std_fa |= FILE_ATTRIBUTE_COMPRESSED; 242 else 243 ni->std_fa &= ~FILE_ATTRIBUTE_COMPRESSED; 244 245 if (is_attr_encrypted(attr)) 246 ni->std_fa |= FILE_ATTRIBUTE_ENCRYPTED; 247 else 248 ni->std_fa &= ~FILE_ATTRIBUTE_ENCRYPTED; 249 250 if (!attr->non_res) { 251 ni->i_valid = inode->i_size = rsize; 252 inode_set_bytes(inode, rsize); 253 } 254 255 mode = S_IFREG | (0777 & sbi->options->fs_fmask_inv); 256 257 if (!attr->non_res) { 258 ni->ni_flags |= NI_FLAG_RESIDENT; 259 goto next_attr; 260 } 261 262 inode_set_bytes(inode, attr_ondisk_size(attr)); 263 264 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 265 inode->i_size = le64_to_cpu(attr->nres.data_size); 266 if (!attr->nres.alloc_size) 267 goto next_attr; 268 269 run = ino == MFT_REC_BITMAP ? &sbi->used.bitmap.run : 270 &ni->file.run; 271 break; 272 273 case ATTR_ROOT: 274 if (attr->non_res) 275 goto out; 276 277 root = Add2Ptr(attr, roff); 278 279 if (attr->name_len != ARRAY_SIZE(I30_NAME) || 280 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 281 goto next_attr; 282 283 if (root->type != ATTR_NAME || 284 root->rule != NTFS_COLLATION_TYPE_FILENAME) 285 goto out; 286 287 if (!is_dir) 288 goto next_attr; 289 290 is_root = true; 291 ni->ni_flags |= NI_FLAG_DIR; 292 293 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 294 if (err) 295 goto out; 296 297 mode = sb->s_root ? 298 (S_IFDIR | (0777 & sbi->options->fs_dmask_inv)) : 299 (S_IFDIR | 0777); 300 goto next_attr; 301 302 case ATTR_ALLOC: 303 if (!is_root || attr->name_len != ARRAY_SIZE(I30_NAME) || 304 memcmp(attr_name(attr), I30_NAME, sizeof(I30_NAME))) 305 goto next_attr; 306 307 inode->i_size = le64_to_cpu(attr->nres.data_size); 308 ni->i_valid = le64_to_cpu(attr->nres.valid_size); 309 inode_set_bytes(inode, le64_to_cpu(attr->nres.alloc_size)); 310 311 run = &ni->dir.alloc_run; 312 break; 313 314 case ATTR_BITMAP: 315 if (ino == MFT_REC_MFT) { 316 if (!attr->non_res) 317 goto out; 318#ifndef CONFIG_NTFS3_64BIT_CLUSTER 319 /* 0x20000000 = 2^32 / 8 */ 320 if (le64_to_cpu(attr->nres.alloc_size) >= 0x20000000) 321 goto out; 322#endif 323 run = &sbi->mft.bitmap.run; 324 break; 325 } else if (is_dir && attr->name_len == ARRAY_SIZE(I30_NAME) && 326 !memcmp(attr_name(attr), I30_NAME, 327 sizeof(I30_NAME)) && 328 attr->non_res) { 329 run = &ni->dir.bitmap_run; 330 break; 331 } 332 goto next_attr; 333 334 case ATTR_REPARSE: 335 if (attr->name_len) 336 goto next_attr; 337 338 rp_fa = ni_parse_reparse(ni, attr, &rp); 339 switch (rp_fa) { 340 case REPARSE_LINK: 341 /* 342 * Normal symlink. 343 * Assume one unicode symbol == one utf8. 344 */ 345 inode->i_size = le16_to_cpu(rp.SymbolicLinkReparseBuffer 346 .PrintNameLength) / 347 sizeof(u16); 348 ni->i_valid = inode->i_size; 349 /* Clear directory bit. */ 350 if (ni->ni_flags & NI_FLAG_DIR) { 351 indx_clear(&ni->dir); 352 memset(&ni->dir, 0, sizeof(ni->dir)); 353 ni->ni_flags &= ~NI_FLAG_DIR; 354 } else { 355 run_close(&ni->file.run); 356 } 357 mode = S_IFLNK | 0777; 358 is_dir = false; 359 if (attr->non_res) { 360 run = &ni->file.run; 361 goto attr_unpack_run; // Double break. 362 } 363 break; 364 365 case REPARSE_COMPRESSED: 366 break; 367 368 case REPARSE_DEDUPLICATED: 369 break; 370 } 371 goto next_attr; 372 373 case ATTR_EA_INFO: 374 if (!attr->name_len && 375 resident_data_ex(attr, sizeof(struct EA_INFO))) { 376 ni->ni_flags |= NI_FLAG_EA; 377 /* 378 * ntfs_get_wsl_perm updates inode->i_uid, inode->i_gid, inode->i_mode 379 */ 380 inode->i_mode = mode; 381 ntfs_get_wsl_perm(inode); 382 mode = inode->i_mode; 383 } 384 goto next_attr; 385 386 default: 387 goto next_attr; 388 } 389 390attr_unpack_run: 391 roff = le16_to_cpu(attr->nres.run_off); 392 393 if (roff > asize) { 394 err = -EINVAL; 395 goto out; 396 } 397 398 t64 = le64_to_cpu(attr->nres.svcn); 399 400 err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), 401 t64, Add2Ptr(attr, roff), asize - roff); 402 if (err < 0) 403 goto out; 404 err = 0; 405 goto next_attr; 406 407end_enum: 408 409 if (!std5) 410 goto out; 411 412 if (!is_match && name) { 413 err = -ENOENT; 414 goto out; 415 } 416 417 if (std5->fa & FILE_ATTRIBUTE_READONLY) 418 mode &= ~0222; 419 420 if (!names) { 421 err = -EINVAL; 422 goto out; 423 } 424 425 if (names != le16_to_cpu(rec->hard_links)) { 426 /* Correct minor error on the fly. Do not mark inode as dirty. */ 427 ntfs_inode_warn(inode, "Correct links count -> %u.", names); 428 rec->hard_links = cpu_to_le16(names); 429 ni->mi.dirty = true; 430 } 431 432 set_nlink(inode, names); 433 434 if (S_ISDIR(mode)) { 435 ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; 436 437 /* 438 * Dot and dot-dot should be included in count but was not 439 * included in enumeration. 440 * Usually a hard links to directories are disabled. 441 */ 442 inode->i_op = &ntfs_dir_inode_operations; 443 if (is_legacy_ntfs(inode->i_sb)) 444 inode->i_fop = &ntfs_legacy_dir_operations; 445 else 446 inode->i_fop = &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 if (is_legacy_ntfs(inode->i_sb)) 457 inode->i_fop = &ntfs_legacy_file_operations; 458 else 459 inode->i_fop = &ntfs_file_operations; 460 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 461 &ntfs_aops; 462 if (ino != MFT_REC_MFT) 463 init_rwsem(&ni->file.run_lock); 464 } else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) || 465 S_ISSOCK(mode)) { 466 inode->i_op = &ntfs_special_inode_operations; 467 init_special_inode(inode, mode, inode->i_rdev); 468 } else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) && 469 fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) { 470 /* Records in $Extend are not a files or general directories. */ 471 inode->i_op = &ntfs_file_inode_operations; 472 } else { 473 err = -EINVAL; 474 goto out; 475 } 476 477 if ((sbi->options->sys_immutable && 478 (std5->fa & FILE_ATTRIBUTE_SYSTEM)) && 479 !S_ISFIFO(mode) && !S_ISSOCK(mode) && !S_ISLNK(mode)) { 480 inode->i_flags |= S_IMMUTABLE; 481 } else { 482 inode->i_flags &= ~S_IMMUTABLE; 483 } 484 485 inode->i_mode = mode; 486 if (!(ni->ni_flags & NI_FLAG_EA)) { 487 /* If no xattr then no security (stored in xattr). */ 488 inode->i_flags |= S_NOSEC; 489 } 490 491 if (ino == MFT_REC_MFT && !sb->s_root) 492 sbi->mft.ni = NULL; 493 494 unlock_new_inode(inode); 495 496 return inode; 497 498out: 499 if (ino == MFT_REC_MFT && !sb->s_root) 500 sbi->mft.ni = NULL; 501 502 iget_failed(inode); 503 return ERR_PTR(err); 504} 505 506/* 507 * ntfs_test_inode 508 * 509 * Return: 1 if match. 510 */ 511static int ntfs_test_inode(struct inode *inode, void *data) 512{ 513 struct MFT_REF *ref = data; 514 515 return ino_get(ref) == inode->i_ino; 516} 517 518static int ntfs_set_inode(struct inode *inode, void *data) 519{ 520 const struct MFT_REF *ref = data; 521 522 inode->i_ino = ino_get(ref); 523 return 0; 524} 525 526struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref, 527 const struct cpu_str *name) 528{ 529 struct inode *inode; 530 531 inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode, 532 (void *)ref); 533 if (unlikely(!inode)) 534 return ERR_PTR(-ENOMEM); 535 536 /* If this is a freshly allocated inode, need to read it now. */ 537 if (inode->i_state & I_NEW) 538 inode = ntfs_read_mft(inode, name, ref); 539 else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) { 540 /* Inode overlaps? */ 541 _ntfs_bad_inode(inode); 542 } 543 544 if (IS_ERR(inode) && name) 545 ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR); 546 547 return inode; 548} 549 550enum get_block_ctx { 551 GET_BLOCK_GENERAL = 0, 552 GET_BLOCK_WRITE_BEGIN = 1, 553 GET_BLOCK_DIRECT_IO_R = 2, 554 GET_BLOCK_DIRECT_IO_W = 3, 555 GET_BLOCK_BMAP = 4, 556}; 557 558static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo, 559 struct buffer_head *bh, int create, 560 enum get_block_ctx ctx) 561{ 562 struct super_block *sb = inode->i_sb; 563 struct ntfs_sb_info *sbi = sb->s_fs_info; 564 struct ntfs_inode *ni = ntfs_i(inode); 565 struct folio *folio = bh->b_folio; 566 u8 cluster_bits = sbi->cluster_bits; 567 u32 block_size = sb->s_blocksize; 568 u64 bytes, lbo, valid; 569 u32 off; 570 int err; 571 CLST vcn, lcn, len; 572 bool new; 573 574 /* Clear previous state. */ 575 clear_buffer_new(bh); 576 clear_buffer_uptodate(bh); 577 578 if (is_resident(ni)) { 579 ni_lock(ni); 580 err = attr_data_read_resident(ni, &folio->page); 581 ni_unlock(ni); 582 583 if (!err) 584 set_buffer_uptodate(bh); 585 bh->b_size = block_size; 586 return err; 587 } 588 589 vcn = vbo >> cluster_bits; 590 off = vbo & sbi->cluster_mask; 591 new = false; 592 593 err = attr_data_get_block(ni, vcn, 1, &lcn, &len, create ? &new : NULL, 594 create && sbi->cluster_size > PAGE_SIZE); 595 if (err) 596 goto out; 597 598 if (!len) 599 return 0; 600 601 bytes = ((u64)len << cluster_bits) - off; 602 603 if (lcn == SPARSE_LCN) { 604 if (!create) { 605 if (bh->b_size > bytes) 606 bh->b_size = bytes; 607 return 0; 608 } 609 WARN_ON(1); 610 } 611 612 if (new) 613 set_buffer_new(bh); 614 615 lbo = ((u64)lcn << cluster_bits) + off; 616 617 set_buffer_mapped(bh); 618 bh->b_bdev = sb->s_bdev; 619 bh->b_blocknr = lbo >> sb->s_blocksize_bits; 620 621 valid = ni->i_valid; 622 623 if (ctx == GET_BLOCK_DIRECT_IO_W) { 624 /* ntfs_direct_IO will update ni->i_valid. */ 625 if (vbo >= valid) 626 set_buffer_new(bh); 627 } else if (create) { 628 /* Normal write. */ 629 if (bytes > bh->b_size) 630 bytes = bh->b_size; 631 632 if (vbo >= valid) 633 set_buffer_new(bh); 634 635 if (vbo + bytes > valid) { 636 ni->i_valid = vbo + bytes; 637 mark_inode_dirty(inode); 638 } 639 } else if (vbo >= valid) { 640 /* Read out of valid data. */ 641 clear_buffer_mapped(bh); 642 } else if (vbo + bytes <= valid) { 643 /* Normal read. */ 644 } else if (vbo + block_size <= valid) { 645 /* Normal short read. */ 646 bytes = block_size; 647 } else { 648 /* 649 * Read across valid size: vbo < valid && valid < vbo + block_size 650 */ 651 bytes = block_size; 652 653 if (folio) { 654 u32 voff = valid - vbo; 655 656 bh->b_size = block_size; 657 off = vbo & (PAGE_SIZE - 1); 658 folio_set_bh(bh, folio, off); 659 660 if (bh_read(bh, 0) < 0) { 661 err = -EIO; 662 goto out; 663 } 664 folio_zero_segment(folio, off + voff, off + block_size); 665 } 666 } 667 668 if (bh->b_size > bytes) 669 bh->b_size = bytes; 670 671#ifndef __LP64__ 672 if (ctx == GET_BLOCK_DIRECT_IO_W || ctx == GET_BLOCK_DIRECT_IO_R) { 673 static_assert(sizeof(size_t) < sizeof(loff_t)); 674 if (bytes > 0x40000000u) 675 bh->b_size = 0x40000000u; 676 } 677#endif 678 679 return 0; 680 681out: 682 return err; 683} 684 685int ntfs_get_block(struct inode *inode, sector_t vbn, 686 struct buffer_head *bh_result, int create) 687{ 688 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 689 bh_result, create, GET_BLOCK_GENERAL); 690} 691 692static int ntfs_get_block_bmap(struct inode *inode, sector_t vsn, 693 struct buffer_head *bh_result, int create) 694{ 695 return ntfs_get_block_vbo(inode, 696 (u64)vsn << inode->i_sb->s_blocksize_bits, 697 bh_result, create, GET_BLOCK_BMAP); 698} 699 700static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) 701{ 702 return generic_block_bmap(mapping, block, ntfs_get_block_bmap); 703} 704 705static int ntfs_read_folio(struct file *file, struct folio *folio) 706{ 707 struct page *page = &folio->page; 708 int err; 709 struct address_space *mapping = page->mapping; 710 struct inode *inode = mapping->host; 711 struct ntfs_inode *ni = ntfs_i(inode); 712 713 if (is_resident(ni)) { 714 ni_lock(ni); 715 err = attr_data_read_resident(ni, page); 716 ni_unlock(ni); 717 if (err != E_NTFS_NONRESIDENT) { 718 unlock_page(page); 719 return err; 720 } 721 } 722 723 if (is_compressed(ni)) { 724 ni_lock(ni); 725 err = ni_readpage_cmpr(ni, page); 726 ni_unlock(ni); 727 return err; 728 } 729 730 /* Normal + sparse files. */ 731 return mpage_read_folio(folio, ntfs_get_block); 732} 733 734static void ntfs_readahead(struct readahead_control *rac) 735{ 736 struct address_space *mapping = rac->mapping; 737 struct inode *inode = mapping->host; 738 struct ntfs_inode *ni = ntfs_i(inode); 739 u64 valid; 740 loff_t pos; 741 742 if (is_resident(ni)) { 743 /* No readahead for resident. */ 744 return; 745 } 746 747 if (is_compressed(ni)) { 748 /* No readahead for compressed. */ 749 return; 750 } 751 752 valid = ni->i_valid; 753 pos = readahead_pos(rac); 754 755 if (valid < i_size_read(inode) && pos <= valid && 756 valid < pos + readahead_length(rac)) { 757 /* Range cross 'valid'. Read it page by page. */ 758 return; 759 } 760 761 mpage_readahead(rac, ntfs_get_block); 762} 763 764static int ntfs_get_block_direct_IO_R(struct inode *inode, sector_t iblock, 765 struct buffer_head *bh_result, int create) 766{ 767 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 768 bh_result, create, GET_BLOCK_DIRECT_IO_R); 769} 770 771static int ntfs_get_block_direct_IO_W(struct inode *inode, sector_t iblock, 772 struct buffer_head *bh_result, int create) 773{ 774 return ntfs_get_block_vbo(inode, (u64)iblock << inode->i_blkbits, 775 bh_result, create, GET_BLOCK_DIRECT_IO_W); 776} 777 778static ssize_t ntfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 779{ 780 struct file *file = iocb->ki_filp; 781 struct address_space *mapping = file->f_mapping; 782 struct inode *inode = mapping->host; 783 struct ntfs_inode *ni = ntfs_i(inode); 784 loff_t vbo = iocb->ki_pos; 785 loff_t end; 786 int wr = iov_iter_rw(iter) & WRITE; 787 size_t iter_count = iov_iter_count(iter); 788 loff_t valid; 789 ssize_t ret; 790 791 if (is_resident(ni)) { 792 /* Switch to buffered write. */ 793 ret = 0; 794 goto out; 795 } 796 797 ret = blockdev_direct_IO(iocb, inode, iter, 798 wr ? ntfs_get_block_direct_IO_W : 799 ntfs_get_block_direct_IO_R); 800 801 if (ret > 0) 802 end = vbo + ret; 803 else if (wr && ret == -EIOCBQUEUED) 804 end = vbo + iter_count; 805 else 806 goto out; 807 808 valid = ni->i_valid; 809 if (wr) { 810 if (end > valid && !S_ISBLK(inode->i_mode)) { 811 ni->i_valid = end; 812 mark_inode_dirty(inode); 813 } 814 } else if (vbo < valid && valid < end) { 815 /* Fix page. */ 816 iov_iter_revert(iter, end - valid); 817 iov_iter_zero(end - valid, iter); 818 } 819 820out: 821 return ret; 822} 823 824int ntfs_set_size(struct inode *inode, u64 new_size) 825{ 826 struct super_block *sb = inode->i_sb; 827 struct ntfs_sb_info *sbi = sb->s_fs_info; 828 struct ntfs_inode *ni = ntfs_i(inode); 829 int err; 830 831 /* Check for maximum file size. */ 832 if (is_sparsed(ni) || is_compressed(ni)) { 833 if (new_size > sbi->maxbytes_sparse) { 834 err = -EFBIG; 835 goto out; 836 } 837 } else if (new_size > sbi->maxbytes) { 838 err = -EFBIG; 839 goto out; 840 } 841 842 ni_lock(ni); 843 down_write(&ni->file.run_lock); 844 845 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, 846 &ni->i_valid, true, NULL); 847 848 up_write(&ni->file.run_lock); 849 ni_unlock(ni); 850 851 mark_inode_dirty(inode); 852 853out: 854 return err; 855} 856 857static int ntfs_resident_writepage(struct folio *folio, 858 struct writeback_control *wbc, void *data) 859{ 860 struct address_space *mapping = data; 861 struct inode *inode = mapping->host; 862 struct ntfs_inode *ni = ntfs_i(inode); 863 int ret; 864 865 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 866 return -EIO; 867 868 ni_lock(ni); 869 ret = attr_data_write_resident(ni, &folio->page); 870 ni_unlock(ni); 871 872 if (ret != E_NTFS_NONRESIDENT) 873 folio_unlock(folio); 874 mapping_set_error(mapping, ret); 875 return ret; 876} 877 878static int ntfs_writepages(struct address_space *mapping, 879 struct writeback_control *wbc) 880{ 881 struct inode *inode = mapping->host; 882 883 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 884 return -EIO; 885 886 if (is_resident(ntfs_i(inode))) 887 return write_cache_pages(mapping, wbc, ntfs_resident_writepage, 888 mapping); 889 return mpage_writepages(mapping, wbc, ntfs_get_block); 890} 891 892static int ntfs_get_block_write_begin(struct inode *inode, sector_t vbn, 893 struct buffer_head *bh_result, int create) 894{ 895 return ntfs_get_block_vbo(inode, (u64)vbn << inode->i_blkbits, 896 bh_result, create, GET_BLOCK_WRITE_BEGIN); 897} 898 899int ntfs_write_begin(struct file *file, struct address_space *mapping, 900 loff_t pos, u32 len, struct page **pagep, void **fsdata) 901{ 902 int err; 903 struct inode *inode = mapping->host; 904 struct ntfs_inode *ni = ntfs_i(inode); 905 906 if (unlikely(ntfs3_forced_shutdown(inode->i_sb))) 907 return -EIO; 908 909 *pagep = NULL; 910 if (is_resident(ni)) { 911 struct page *page = 912 grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT); 913 914 if (!page) { 915 err = -ENOMEM; 916 goto out; 917 } 918 919 ni_lock(ni); 920 err = attr_data_read_resident(ni, page); 921 ni_unlock(ni); 922 923 if (!err) { 924 *pagep = page; 925 goto out; 926 } 927 unlock_page(page); 928 put_page(page); 929 930 if (err != E_NTFS_NONRESIDENT) 931 goto out; 932 } 933 934 err = block_write_begin(mapping, pos, len, pagep, 935 ntfs_get_block_write_begin); 936 937out: 938 return err; 939} 940 941/* 942 * ntfs_write_end - Address_space_operations::write_end. 943 */ 944int ntfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, 945 u32 len, u32 copied, struct page *page, void *fsdata) 946{ 947 struct inode *inode = mapping->host; 948 struct ntfs_inode *ni = ntfs_i(inode); 949 u64 valid = ni->i_valid; 950 bool dirty = false; 951 int err; 952 953 if (is_resident(ni)) { 954 ni_lock(ni); 955 err = attr_data_write_resident(ni, page); 956 ni_unlock(ni); 957 if (!err) { 958 dirty = true; 959 /* Clear any buffers in page. */ 960 if (page_has_buffers(page)) { 961 struct buffer_head *head, *bh; 962 963 bh = head = page_buffers(page); 964 do { 965 clear_buffer_dirty(bh); 966 clear_buffer_mapped(bh); 967 set_buffer_uptodate(bh); 968 } while (head != (bh = bh->b_this_page)); 969 } 970 SetPageUptodate(page); 971 err = copied; 972 } 973 unlock_page(page); 974 put_page(page); 975 } else { 976 err = generic_write_end(file, mapping, pos, len, copied, page, 977 fsdata); 978 } 979 980 if (err >= 0) { 981 if (!(ni->std_fa & FILE_ATTRIBUTE_ARCHIVE)) { 982 inode_set_mtime_to_ts(inode, 983 inode_set_ctime_current(inode)); 984 ni->std_fa |= FILE_ATTRIBUTE_ARCHIVE; 985 dirty = true; 986 } 987 988 if (valid != ni->i_valid) { 989 /* ni->i_valid is changed in ntfs_get_block_vbo. */ 990 dirty = true; 991 } 992 993 if (pos + err > inode->i_size) { 994 i_size_write(inode, pos + err); 995 dirty = true; 996 } 997 998 if (dirty) 999 mark_inode_dirty(inode); 1000 } 1001 1002 return err; 1003} 1004 1005int reset_log_file(struct inode *inode) 1006{ 1007 int err; 1008 loff_t pos = 0; 1009 u32 log_size = inode->i_size; 1010 struct address_space *mapping = inode->i_mapping; 1011 1012 for (;;) { 1013 u32 len; 1014 void *kaddr; 1015 struct page *page; 1016 1017 len = pos + PAGE_SIZE > log_size ? (log_size - pos) : PAGE_SIZE; 1018 1019 err = block_write_begin(mapping, pos, len, &page, 1020 ntfs_get_block_write_begin); 1021 if (err) 1022 goto out; 1023 1024 kaddr = kmap_atomic(page); 1025 memset(kaddr, -1, len); 1026 kunmap_atomic(kaddr); 1027 flush_dcache_page(page); 1028 1029 err = block_write_end(NULL, mapping, pos, len, len, page, NULL); 1030 if (err < 0) 1031 goto out; 1032 pos += len; 1033 1034 if (pos >= log_size) 1035 break; 1036 balance_dirty_pages_ratelimited(mapping); 1037 } 1038out: 1039 mark_inode_dirty_sync(inode); 1040 1041 return err; 1042} 1043 1044int ntfs3_write_inode(struct inode *inode, struct writeback_control *wbc) 1045{ 1046 return _ni_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 1047} 1048 1049int ntfs_sync_inode(struct inode *inode) 1050{ 1051 return _ni_write_inode(inode, 1); 1052} 1053 1054/* 1055 * writeback_inode - Helper function for ntfs_flush_inodes(). 1056 * 1057 * This writes both the inode and the file data blocks, waiting 1058 * for in flight data blocks before the start of the call. It 1059 * does not wait for any io started during the call. 1060 */ 1061static int writeback_inode(struct inode *inode) 1062{ 1063 int ret = sync_inode_metadata(inode, 0); 1064 1065 if (!ret) 1066 ret = filemap_fdatawrite(inode->i_mapping); 1067 return ret; 1068} 1069 1070/* 1071 * ntfs_flush_inodes 1072 * 1073 * Write data and metadata corresponding to i1 and i2. The io is 1074 * started but we do not wait for any of it to finish. 1075 * 1076 * filemap_flush() is used for the block device, so if there is a dirty 1077 * page for a block already in flight, we will not wait and start the 1078 * io over again. 1079 */ 1080int ntfs_flush_inodes(struct super_block *sb, struct inode *i1, 1081 struct inode *i2) 1082{ 1083 int ret = 0; 1084 1085 if (i1) 1086 ret = writeback_inode(i1); 1087 if (!ret && i2) 1088 ret = writeback_inode(i2); 1089 if (!ret) 1090 ret = sync_blockdev_nowait(sb->s_bdev); 1091 return ret; 1092} 1093 1094int inode_write_data(struct inode *inode, const void *data, size_t bytes) 1095{ 1096 pgoff_t idx; 1097 1098 /* Write non resident data. */ 1099 for (idx = 0; bytes; idx++) { 1100 size_t op = bytes > PAGE_SIZE ? PAGE_SIZE : bytes; 1101 struct page *page = ntfs_map_page(inode->i_mapping, idx); 1102 1103 if (IS_ERR(page)) 1104 return PTR_ERR(page); 1105 1106 lock_page(page); 1107 WARN_ON(!PageUptodate(page)); 1108 ClearPageUptodate(page); 1109 1110 memcpy(page_address(page), data, op); 1111 1112 flush_dcache_page(page); 1113 SetPageUptodate(page); 1114 unlock_page(page); 1115 1116 ntfs_unmap_page(page); 1117 1118 bytes -= op; 1119 data = Add2Ptr(data, PAGE_SIZE); 1120 } 1121 return 0; 1122} 1123 1124/* 1125 * ntfs_reparse_bytes 1126 * 1127 * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) 1128 * for unicode string of @uni_len length. 1129 */ 1130static inline u32 ntfs_reparse_bytes(u32 uni_len) 1131{ 1132 /* Header + unicode string + decorated unicode string. */ 1133 return sizeof(short) * (2 * uni_len + 4) + 1134 offsetof(struct REPARSE_DATA_BUFFER, 1135 SymbolicLinkReparseBuffer.PathBuffer); 1136} 1137 1138static struct REPARSE_DATA_BUFFER * 1139ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, 1140 u32 size, u16 *nsize) 1141{ 1142 int i, err; 1143 struct REPARSE_DATA_BUFFER *rp; 1144 __le16 *rp_name; 1145 typeof(rp->SymbolicLinkReparseBuffer) *rs; 1146 1147 rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); 1148 if (!rp) 1149 return ERR_PTR(-ENOMEM); 1150 1151 rs = &rp->SymbolicLinkReparseBuffer; 1152 rp_name = rs->PathBuffer; 1153 1154 /* Convert link name to UTF-16. */ 1155 err = ntfs_nls_to_utf16(sbi, symname, size, 1156 (struct cpu_str *)(rp_name - 1), 2 * size, 1157 UTF16_LITTLE_ENDIAN); 1158 if (err < 0) 1159 goto out; 1160 1161 /* err = the length of unicode name of symlink. */ 1162 *nsize = ntfs_reparse_bytes(err); 1163 1164 if (*nsize > sbi->reparse.max_size) { 1165 err = -EFBIG; 1166 goto out; 1167 } 1168 1169 /* Translate Linux '/' into Windows '\'. */ 1170 for (i = 0; i < err; i++) { 1171 if (rp_name[i] == cpu_to_le16('/')) 1172 rp_name[i] = cpu_to_le16('\\'); 1173 } 1174 1175 rp->ReparseTag = IO_REPARSE_TAG_SYMLINK; 1176 rp->ReparseDataLength = 1177 cpu_to_le16(*nsize - offsetof(struct REPARSE_DATA_BUFFER, 1178 SymbolicLinkReparseBuffer)); 1179 1180 /* PrintName + SubstituteName. */ 1181 rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); 1182 rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); 1183 rs->PrintNameLength = rs->SubstituteNameOffset; 1184 1185 /* 1186 * TODO: Use relative path if possible to allow Windows to 1187 * parse this path. 1188 * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). 1189 */ 1190 rs->Flags = 0; 1191 1192 memmove(rp_name + err + 4, rp_name, sizeof(short) * err); 1193 1194 /* Decorate SubstituteName. */ 1195 rp_name += err; 1196 rp_name[0] = cpu_to_le16('\\'); 1197 rp_name[1] = cpu_to_le16('?'); 1198 rp_name[2] = cpu_to_le16('?'); 1199 rp_name[3] = cpu_to_le16('\\'); 1200 1201 return rp; 1202out: 1203 kfree(rp); 1204 return ERR_PTR(err); 1205} 1206 1207/* 1208 * ntfs_create_inode 1209 * 1210 * Helper function for: 1211 * - ntfs_create 1212 * - ntfs_mknod 1213 * - ntfs_symlink 1214 * - ntfs_mkdir 1215 * - ntfs_atomic_open 1216 * 1217 * NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked 1218 */ 1219struct inode *ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir, 1220 struct dentry *dentry, 1221 const struct cpu_str *uni, umode_t mode, 1222 dev_t dev, const char *symname, u32 size, 1223 struct ntfs_fnd *fnd) 1224{ 1225 int err; 1226 struct super_block *sb = dir->i_sb; 1227 struct ntfs_sb_info *sbi = sb->s_fs_info; 1228 const struct qstr *name = &dentry->d_name; 1229 CLST ino = 0; 1230 struct ntfs_inode *dir_ni = ntfs_i(dir); 1231 struct ntfs_inode *ni = NULL; 1232 struct inode *inode = NULL; 1233 struct ATTRIB *attr; 1234 struct ATTR_STD_INFO5 *std5; 1235 struct ATTR_FILE_NAME *fname; 1236 struct MFT_REC *rec; 1237 u32 asize, dsize, sd_size; 1238 enum FILE_ATTRIBUTE fa; 1239 __le32 security_id = SECURITY_ID_INVALID; 1240 CLST vcn; 1241 const void *sd; 1242 u16 t16, nsize = 0, aid = 0; 1243 struct INDEX_ROOT *root, *dir_root; 1244 struct NTFS_DE *e, *new_de = NULL; 1245 struct REPARSE_DATA_BUFFER *rp = NULL; 1246 bool rp_inserted = false; 1247 1248 if (!fnd) 1249 ni_lock_dir(dir_ni); 1250 1251 dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL); 1252 if (!dir_root) { 1253 err = -EINVAL; 1254 goto out1; 1255 } 1256 1257 if (S_ISDIR(mode)) { 1258 /* Use parent's directory attributes. */ 1259 fa = dir_ni->std_fa | FILE_ATTRIBUTE_DIRECTORY | 1260 FILE_ATTRIBUTE_ARCHIVE; 1261 /* 1262 * By default child directory inherits parent attributes. 1263 * Root directory is hidden + system. 1264 * Make an exception for children in root. 1265 */ 1266 if (dir->i_ino == MFT_REC_ROOT) 1267 fa &= ~(FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM); 1268 } else if (S_ISLNK(mode)) { 1269 /* It is good idea that link should be the same type (file/dir) as target */ 1270 fa = FILE_ATTRIBUTE_REPARSE_POINT; 1271 1272 /* 1273 * Linux: there are dir/file/symlink and so on. 1274 * NTFS: symlinks are "dir + reparse" or "file + reparse" 1275 * It is good idea to create: 1276 * dir + reparse if 'symname' points to directory 1277 * or 1278 * file + reparse if 'symname' points to file 1279 * Unfortunately kern_path hangs if symname contains 'dir'. 1280 */ 1281 1282 /* 1283 * struct path path; 1284 * 1285 * if (!kern_path(symname, LOOKUP_FOLLOW, &path)){ 1286 * struct inode *target = d_inode(path.dentry); 1287 * 1288 * if (S_ISDIR(target->i_mode)) 1289 * fa |= FILE_ATTRIBUTE_DIRECTORY; 1290 * // if ( target->i_sb == sb ){ 1291 * // use relative path? 1292 * // } 1293 * path_put(&path); 1294 * } 1295 */ 1296 } else if (S_ISREG(mode)) { 1297 if (sbi->options->sparse) { 1298 /* Sparsed regular file, cause option 'sparse'. */ 1299 fa = FILE_ATTRIBUTE_SPARSE_FILE | 1300 FILE_ATTRIBUTE_ARCHIVE; 1301 } else if (dir_ni->std_fa & FILE_ATTRIBUTE_COMPRESSED) { 1302 /* Compressed regular file, if parent is compressed. */ 1303 fa = FILE_ATTRIBUTE_COMPRESSED | FILE_ATTRIBUTE_ARCHIVE; 1304 } else { 1305 /* Regular file, default attributes. */ 1306 fa = FILE_ATTRIBUTE_ARCHIVE; 1307 } 1308 } else { 1309 fa = FILE_ATTRIBUTE_ARCHIVE; 1310 } 1311 1312 /* If option "hide_dot_files" then set hidden attribute for dot files. */ 1313 if (sbi->options->hide_dot_files && name->name[0] == '.') 1314 fa |= FILE_ATTRIBUTE_HIDDEN; 1315 1316 if (!(mode & 0222)) 1317 fa |= FILE_ATTRIBUTE_READONLY; 1318 1319 /* Allocate PATH_MAX bytes. */ 1320 new_de = __getname(); 1321 if (!new_de) { 1322 err = -ENOMEM; 1323 goto out1; 1324 } 1325 1326 if (unlikely(ntfs3_forced_shutdown(sb))) { 1327 err = -EIO; 1328 goto out2; 1329 } 1330 1331 /* Mark rw ntfs as dirty. it will be cleared at umount. */ 1332 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1333 1334 /* Step 1: allocate and fill new mft record. */ 1335 err = ntfs_look_free_mft(sbi, &ino, false, NULL, NULL); 1336 if (err) 1337 goto out2; 1338 1339 ni = ntfs_new_inode(sbi, ino, S_ISDIR(mode) ? RECORD_FLAG_DIR : 0); 1340 if (IS_ERR(ni)) { 1341 err = PTR_ERR(ni); 1342 ni = NULL; 1343 goto out3; 1344 } 1345 inode = &ni->vfs_inode; 1346 inode_init_owner(idmap, inode, dir, mode); 1347 mode = inode->i_mode; 1348 1349 ni->i_crtime = current_time(inode); 1350 1351 rec = ni->mi.mrec; 1352 rec->hard_links = cpu_to_le16(1); 1353 attr = Add2Ptr(rec, le16_to_cpu(rec->attr_off)); 1354 1355 /* Get default security id. */ 1356 sd = s_default_security; 1357 sd_size = sizeof(s_default_security); 1358 1359 if (is_ntfs3(sbi)) { 1360 security_id = dir_ni->std_security_id; 1361 if (le32_to_cpu(security_id) < SECURITY_ID_FIRST) { 1362 security_id = sbi->security.def_security_id; 1363 1364 if (security_id == SECURITY_ID_INVALID && 1365 !ntfs_insert_security(sbi, sd, sd_size, 1366 &security_id, NULL)) 1367 sbi->security.def_security_id = security_id; 1368 } 1369 } 1370 1371 /* Insert standard info. */ 1372 std5 = Add2Ptr(attr, SIZEOF_RESIDENT); 1373 1374 if (security_id == SECURITY_ID_INVALID) { 1375 dsize = sizeof(struct ATTR_STD_INFO); 1376 } else { 1377 dsize = sizeof(struct ATTR_STD_INFO5); 1378 std5->security_id = security_id; 1379 ni->std_security_id = security_id; 1380 } 1381 asize = SIZEOF_RESIDENT + dsize; 1382 1383 attr->type = ATTR_STD; 1384 attr->size = cpu_to_le32(asize); 1385 attr->id = cpu_to_le16(aid++); 1386 attr->res.data_off = SIZEOF_RESIDENT_LE; 1387 attr->res.data_size = cpu_to_le32(dsize); 1388 1389 std5->cr_time = std5->m_time = std5->c_time = std5->a_time = 1390 kernel2nt(&ni->i_crtime); 1391 1392 std5->fa = ni->std_fa = fa; 1393 1394 attr = Add2Ptr(attr, asize); 1395 1396 /* Insert file name. */ 1397 err = fill_name_de(sbi, new_de, name, uni); 1398 if (err) 1399 goto out4; 1400 1401 mi_get_ref(&ni->mi, &new_de->ref); 1402 1403 fname = (struct ATTR_FILE_NAME *)(new_de + 1); 1404 1405 if (sbi->options->windows_names && 1406 !valid_windows_name(sbi, (struct le_str *)&fname->name_len)) { 1407 err = -EINVAL; 1408 goto out4; 1409 } 1410 1411 mi_get_ref(&dir_ni->mi, &fname->home); 1412 fname->dup.cr_time = fname->dup.m_time = fname->dup.c_time = 1413 fname->dup.a_time = std5->cr_time; 1414 fname->dup.alloc_size = fname->dup.data_size = 0; 1415 fname->dup.fa = std5->fa; 1416 fname->dup.ea_size = fname->dup.reparse = 0; 1417 1418 dsize = le16_to_cpu(new_de->key_size); 1419 asize = ALIGN(SIZEOF_RESIDENT + dsize, 8); 1420 1421 attr->type = ATTR_NAME; 1422 attr->size = cpu_to_le32(asize); 1423 attr->res.data_off = SIZEOF_RESIDENT_LE; 1424 attr->res.flags = RESIDENT_FLAG_INDEXED; 1425 attr->id = cpu_to_le16(aid++); 1426 attr->res.data_size = cpu_to_le32(dsize); 1427 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), fname, dsize); 1428 1429 attr = Add2Ptr(attr, asize); 1430 1431 if (security_id == SECURITY_ID_INVALID) { 1432 /* Insert security attribute. */ 1433 asize = SIZEOF_RESIDENT + ALIGN(sd_size, 8); 1434 1435 attr->type = ATTR_SECURE; 1436 attr->size = cpu_to_le32(asize); 1437 attr->id = cpu_to_le16(aid++); 1438 attr->res.data_off = SIZEOF_RESIDENT_LE; 1439 attr->res.data_size = cpu_to_le32(sd_size); 1440 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), sd, sd_size); 1441 1442 attr = Add2Ptr(attr, asize); 1443 } 1444 1445 attr->id = cpu_to_le16(aid++); 1446 if (fa & FILE_ATTRIBUTE_DIRECTORY) { 1447 /* 1448 * Regular directory or symlink to directory. 1449 * Create root attribute. 1450 */ 1451 dsize = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); 1452 asize = sizeof(I30_NAME) + SIZEOF_RESIDENT + dsize; 1453 1454 attr->type = ATTR_ROOT; 1455 attr->size = cpu_to_le32(asize); 1456 1457 attr->name_len = ARRAY_SIZE(I30_NAME); 1458 attr->name_off = SIZEOF_RESIDENT_LE; 1459 attr->res.data_off = 1460 cpu_to_le16(sizeof(I30_NAME) + SIZEOF_RESIDENT); 1461 attr->res.data_size = cpu_to_le32(dsize); 1462 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), I30_NAME, 1463 sizeof(I30_NAME)); 1464 1465 root = Add2Ptr(attr, sizeof(I30_NAME) + SIZEOF_RESIDENT); 1466 memcpy(root, dir_root, offsetof(struct INDEX_ROOT, ihdr)); 1467 root->ihdr.de_off = cpu_to_le32(sizeof(struct INDEX_HDR)); 1468 root->ihdr.used = cpu_to_le32(sizeof(struct INDEX_HDR) + 1469 sizeof(struct NTFS_DE)); 1470 root->ihdr.total = root->ihdr.used; 1471 1472 e = Add2Ptr(root, sizeof(struct INDEX_ROOT)); 1473 e->size = cpu_to_le16(sizeof(struct NTFS_DE)); 1474 e->flags = NTFS_IE_LAST; 1475 } else if (S_ISLNK(mode)) { 1476 /* 1477 * Symlink to file. 1478 * Create empty resident data attribute. 1479 */ 1480 asize = SIZEOF_RESIDENT; 1481 1482 /* Insert empty ATTR_DATA */ 1483 attr->type = ATTR_DATA; 1484 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1485 attr->name_off = SIZEOF_RESIDENT_LE; 1486 attr->res.data_off = SIZEOF_RESIDENT_LE; 1487 } else if (S_ISREG(mode)) { 1488 /* 1489 * Regular file. Create empty non resident data attribute. 1490 */ 1491 attr->type = ATTR_DATA; 1492 attr->non_res = 1; 1493 attr->nres.evcn = cpu_to_le64(-1ll); 1494 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) { 1495 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1496 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1497 attr->flags = ATTR_FLAG_SPARSED; 1498 asize = SIZEOF_NONRESIDENT_EX + 8; 1499 } else if (fa & FILE_ATTRIBUTE_COMPRESSED) { 1500 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT_EX + 8); 1501 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1502 attr->flags = ATTR_FLAG_COMPRESSED; 1503 attr->nres.c_unit = COMPRESSION_UNIT; 1504 asize = SIZEOF_NONRESIDENT_EX + 8; 1505 } else { 1506 attr->size = cpu_to_le32(SIZEOF_NONRESIDENT + 8); 1507 attr->name_off = SIZEOF_NONRESIDENT_LE; 1508 asize = SIZEOF_NONRESIDENT + 8; 1509 } 1510 attr->nres.run_off = attr->name_off; 1511 } else { 1512 /* 1513 * Node. Create empty resident data attribute. 1514 */ 1515 attr->type = ATTR_DATA; 1516 attr->size = cpu_to_le32(SIZEOF_RESIDENT); 1517 attr->name_off = SIZEOF_RESIDENT_LE; 1518 if (fa & FILE_ATTRIBUTE_SPARSE_FILE) 1519 attr->flags = ATTR_FLAG_SPARSED; 1520 else if (fa & FILE_ATTRIBUTE_COMPRESSED) 1521 attr->flags = ATTR_FLAG_COMPRESSED; 1522 attr->res.data_off = SIZEOF_RESIDENT_LE; 1523 asize = SIZEOF_RESIDENT; 1524 ni->ni_flags |= NI_FLAG_RESIDENT; 1525 } 1526 1527 if (S_ISDIR(mode)) { 1528 ni->ni_flags |= NI_FLAG_DIR; 1529 err = indx_init(&ni->dir, sbi, attr, INDEX_MUTEX_I30); 1530 if (err) 1531 goto out4; 1532 } else if (S_ISLNK(mode)) { 1533 rp = ntfs_create_reparse_buffer(sbi, symname, size, &nsize); 1534 1535 if (IS_ERR(rp)) { 1536 err = PTR_ERR(rp); 1537 rp = NULL; 1538 goto out4; 1539 } 1540 1541 /* 1542 * Insert ATTR_REPARSE. 1543 */ 1544 attr = Add2Ptr(attr, asize); 1545 attr->type = ATTR_REPARSE; 1546 attr->id = cpu_to_le16(aid++); 1547 1548 /* Resident or non resident? */ 1549 asize = ALIGN(SIZEOF_RESIDENT + nsize, 8); 1550 t16 = PtrOffset(rec, attr); 1551 1552 /* 1553 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes. 1554 * It is good idea to keep extened attributes resident. 1555 */ 1556 if (asize + t16 + 0x78 + 8 > sbi->record_size) { 1557 CLST alen; 1558 CLST clst = bytes_to_cluster(sbi, nsize); 1559 1560 /* Bytes per runs. */ 1561 t16 = sbi->record_size - t16 - SIZEOF_NONRESIDENT; 1562 1563 attr->non_res = 1; 1564 attr->nres.evcn = cpu_to_le64(clst - 1); 1565 attr->name_off = SIZEOF_NONRESIDENT_LE; 1566 attr->nres.run_off = attr->name_off; 1567 attr->nres.data_size = cpu_to_le64(nsize); 1568 attr->nres.valid_size = attr->nres.data_size; 1569 attr->nres.alloc_size = 1570 cpu_to_le64(ntfs_up_cluster(sbi, nsize)); 1571 1572 err = attr_allocate_clusters(sbi, &ni->file.run, 0, 0, 1573 clst, NULL, ALLOCATE_DEF, 1574 &alen, 0, NULL, NULL); 1575 if (err) 1576 goto out5; 1577 1578 err = run_pack(&ni->file.run, 0, clst, 1579 Add2Ptr(attr, SIZEOF_NONRESIDENT), t16, 1580 &vcn); 1581 if (err < 0) 1582 goto out5; 1583 1584 if (vcn != clst) { 1585 err = -EINVAL; 1586 goto out5; 1587 } 1588 1589 asize = SIZEOF_NONRESIDENT + ALIGN(err, 8); 1590 /* Write non resident data. */ 1591 err = ntfs_sb_write_run(sbi, &ni->file.run, 0, rp, 1592 nsize, 0); 1593 if (err) 1594 goto out5; 1595 } else { 1596 attr->res.data_off = SIZEOF_RESIDENT_LE; 1597 attr->res.data_size = cpu_to_le32(nsize); 1598 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize); 1599 } 1600 /* Size of symlink equals the length of input string. */ 1601 inode->i_size = size; 1602 1603 attr->size = cpu_to_le32(asize); 1604 1605 err = ntfs_insert_reparse(sbi, IO_REPARSE_TAG_SYMLINK, 1606 &new_de->ref); 1607 if (err) 1608 goto out5; 1609 1610 rp_inserted = true; 1611 } 1612 1613 attr = Add2Ptr(attr, asize); 1614 attr->type = ATTR_END; 1615 1616 rec->used = cpu_to_le32(PtrOffset(rec, attr) + 8); 1617 rec->next_attr_id = cpu_to_le16(aid); 1618 1619 inode->i_generation = le16_to_cpu(rec->seq); 1620 1621 if (S_ISDIR(mode)) { 1622 inode->i_op = &ntfs_dir_inode_operations; 1623 if (is_legacy_ntfs(inode->i_sb)) 1624 inode->i_fop = &ntfs_legacy_dir_operations; 1625 else 1626 inode->i_fop = &ntfs_dir_operations; 1627 } else if (S_ISLNK(mode)) { 1628 inode->i_op = &ntfs_link_inode_operations; 1629 inode->i_fop = NULL; 1630 inode->i_mapping->a_ops = &ntfs_aops; 1631 inode->i_size = size; 1632 inode_nohighmem(inode); 1633 } else if (S_ISREG(mode)) { 1634 inode->i_op = &ntfs_file_inode_operations; 1635 if (is_legacy_ntfs(inode->i_sb)) 1636 inode->i_fop = &ntfs_legacy_file_operations; 1637 else 1638 inode->i_fop = &ntfs_file_operations; 1639 inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr : 1640 &ntfs_aops; 1641 init_rwsem(&ni->file.run_lock); 1642 } else { 1643 inode->i_op = &ntfs_special_inode_operations; 1644 init_special_inode(inode, mode, dev); 1645 } 1646 1647#ifdef CONFIG_NTFS3_FS_POSIX_ACL 1648 if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) { 1649 err = ntfs_init_acl(idmap, inode, dir); 1650 if (err) 1651 goto out5; 1652 } else 1653#endif 1654 { 1655 inode->i_flags |= S_NOSEC; 1656 } 1657 1658 /* 1659 * ntfs_init_acl and ntfs_save_wsl_perm update extended attribute. 1660 * The packed size of extended attribute is stored in direntry too. 1661 * 'fname' here points to inside new_de. 1662 */ 1663 ntfs_save_wsl_perm(inode, &fname->dup.ea_size); 1664 1665 /* 1666 * update ea_size in file_name attribute too. 1667 * Use ni_find_attr cause layout of MFT record may be changed 1668 * in ntfs_init_acl and ntfs_save_wsl_perm. 1669 */ 1670 attr = ni_find_attr(ni, NULL, NULL, ATTR_NAME, NULL, 0, NULL, NULL); 1671 if (attr) { 1672 struct ATTR_FILE_NAME *fn; 1673 1674 fn = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1675 if (fn) 1676 fn->dup.ea_size = fname->dup.ea_size; 1677 } 1678 1679 /* We do not need to update parent directory later */ 1680 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; 1681 1682 /* Step 2: Add new name in index. */ 1683 err = indx_insert_entry(&dir_ni->dir, dir_ni, new_de, sbi, fnd, 0); 1684 if (err) 1685 goto out6; 1686 1687 /* 1688 * Call 'd_instantiate' after inode->i_op is set 1689 * but before finish_open. 1690 */ 1691 d_instantiate(dentry, inode); 1692 1693 /* Set original time. inode times (i_ctime) may be changed in ntfs_init_acl. */ 1694 inode_set_atime_to_ts(inode, ni->i_crtime); 1695 inode_set_ctime_to_ts(inode, ni->i_crtime); 1696 inode_set_mtime_to_ts(inode, ni->i_crtime); 1697 inode_set_mtime_to_ts(dir, ni->i_crtime); 1698 inode_set_ctime_to_ts(dir, ni->i_crtime); 1699 1700 mark_inode_dirty(dir); 1701 mark_inode_dirty(inode); 1702 1703 /* Normal exit. */ 1704 goto out2; 1705 1706out6: 1707 if (rp_inserted) 1708 ntfs_remove_reparse(sbi, IO_REPARSE_TAG_SYMLINK, &new_de->ref); 1709 1710out5: 1711 if (!S_ISDIR(mode)) 1712 run_deallocate(sbi, &ni->file.run, false); 1713 1714out4: 1715 clear_rec_inuse(rec); 1716 clear_nlink(inode); 1717 ni->mi.dirty = false; 1718 discard_new_inode(inode); 1719out3: 1720 ntfs_mark_rec_free(sbi, ino, false); 1721 1722out2: 1723 __putname(new_de); 1724 kfree(rp); 1725 1726out1: 1727 if (!fnd) 1728 ni_unlock(dir_ni); 1729 1730 if (err) 1731 return ERR_PTR(err); 1732 1733 unlock_new_inode(inode); 1734 1735 return inode; 1736} 1737 1738int ntfs_link_inode(struct inode *inode, struct dentry *dentry) 1739{ 1740 int err; 1741 struct ntfs_inode *ni = ntfs_i(inode); 1742 struct ntfs_sb_info *sbi = inode->i_sb->s_fs_info; 1743 struct NTFS_DE *de; 1744 1745 /* Allocate PATH_MAX bytes. */ 1746 de = __getname(); 1747 if (!de) 1748 return -ENOMEM; 1749 1750 /* Mark rw ntfs as dirty. It will be cleared at umount. */ 1751 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 1752 1753 /* Construct 'de'. */ 1754 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1755 if (err) 1756 goto out; 1757 1758 err = ni_add_name(ntfs_i(d_inode(dentry->d_parent)), ni, de); 1759out: 1760 __putname(de); 1761 return err; 1762} 1763 1764/* 1765 * ntfs_unlink_inode 1766 * 1767 * inode_operations::unlink 1768 * inode_operations::rmdir 1769 */ 1770int ntfs_unlink_inode(struct inode *dir, const struct dentry *dentry) 1771{ 1772 int err; 1773 struct ntfs_sb_info *sbi = dir->i_sb->s_fs_info; 1774 struct inode *inode = d_inode(dentry); 1775 struct ntfs_inode *ni = ntfs_i(inode); 1776 struct ntfs_inode *dir_ni = ntfs_i(dir); 1777 struct NTFS_DE *de, *de2 = NULL; 1778 int undo_remove; 1779 1780 if (ntfs_is_meta_file(sbi, ni->mi.rno)) 1781 return -EINVAL; 1782 1783 /* Allocate PATH_MAX bytes. */ 1784 de = __getname(); 1785 if (!de) 1786 return -ENOMEM; 1787 1788 ni_lock(ni); 1789 1790 if (S_ISDIR(inode->i_mode) && !dir_is_empty(inode)) { 1791 err = -ENOTEMPTY; 1792 goto out; 1793 } 1794 1795 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 1796 if (err < 0) 1797 goto out; 1798 1799 undo_remove = 0; 1800 err = ni_remove_name(dir_ni, ni, de, &de2, &undo_remove); 1801 1802 if (!err) { 1803 drop_nlink(inode); 1804 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 1805 mark_inode_dirty(dir); 1806 inode_set_ctime_to_ts(inode, inode_get_ctime(dir)); 1807 if (inode->i_nlink) 1808 mark_inode_dirty(inode); 1809 } else if (!ni_remove_name_undo(dir_ni, ni, de, de2, undo_remove)) { 1810 _ntfs_bad_inode(inode); 1811 } else { 1812 if (ni_is_dirty(dir)) 1813 mark_inode_dirty(dir); 1814 if (ni_is_dirty(inode)) 1815 mark_inode_dirty(inode); 1816 } 1817 1818out: 1819 ni_unlock(ni); 1820 __putname(de); 1821 return err; 1822} 1823 1824void ntfs_evict_inode(struct inode *inode) 1825{ 1826 truncate_inode_pages_final(&inode->i_data); 1827 1828 invalidate_inode_buffers(inode); 1829 clear_inode(inode); 1830 1831 ni_clear(ntfs_i(inode)); 1832} 1833 1834/* 1835 * ntfs_translate_junction 1836 * 1837 * Translate a Windows junction target to the Linux equivalent. 1838 * On junctions, targets are always absolute (they include the drive 1839 * letter). We have no way of knowing if the target is for the current 1840 * mounted device or not so we just assume it is. 1841 */ 1842static int ntfs_translate_junction(const struct super_block *sb, 1843 const struct dentry *link_de, char *target, 1844 int target_len, int target_max) 1845{ 1846 int tl_len, err = target_len; 1847 char *link_path_buffer = NULL, *link_path; 1848 char *translated = NULL; 1849 char *target_start; 1850 int copy_len; 1851 1852 link_path_buffer = kmalloc(PATH_MAX, GFP_NOFS); 1853 if (!link_path_buffer) { 1854 err = -ENOMEM; 1855 goto out; 1856 } 1857 /* Get link path, relative to mount point */ 1858 link_path = dentry_path_raw(link_de, link_path_buffer, PATH_MAX); 1859 if (IS_ERR(link_path)) { 1860 ntfs_err(sb, "Error getting link path"); 1861 err = -EINVAL; 1862 goto out; 1863 } 1864 1865 translated = kmalloc(PATH_MAX, GFP_NOFS); 1866 if (!translated) { 1867 err = -ENOMEM; 1868 goto out; 1869 } 1870 1871 /* Make translated path a relative path to mount point */ 1872 strcpy(translated, "./"); 1873 ++link_path; /* Skip leading / */ 1874 for (tl_len = sizeof("./") - 1; *link_path; ++link_path) { 1875 if (*link_path == '/') { 1876 if (PATH_MAX - tl_len < sizeof("../")) { 1877 ntfs_err(sb, 1878 "Link path %s has too many components", 1879 link_path); 1880 err = -EINVAL; 1881 goto out; 1882 } 1883 strcpy(translated + tl_len, "../"); 1884 tl_len += sizeof("../") - 1; 1885 } 1886 } 1887 1888 /* Skip drive letter */ 1889 target_start = target; 1890 while (*target_start && *target_start != ':') 1891 ++target_start; 1892 1893 if (!*target_start) { 1894 ntfs_err(sb, "Link target (%s) missing drive separator", 1895 target); 1896 err = -EINVAL; 1897 goto out; 1898 } 1899 1900 /* Skip drive separator and leading /, if exists */ 1901 target_start += 1 + (target_start[1] == '/'); 1902 copy_len = target_len - (target_start - target); 1903 1904 if (PATH_MAX - tl_len <= copy_len) { 1905 ntfs_err(sb, "Link target %s too large for buffer (%d <= %d)", 1906 target_start, PATH_MAX - tl_len, copy_len); 1907 err = -EINVAL; 1908 goto out; 1909 } 1910 1911 /* translated path has a trailing / and target_start does not */ 1912 strcpy(translated + tl_len, target_start); 1913 tl_len += copy_len; 1914 if (target_max <= tl_len) { 1915 ntfs_err(sb, "Target path %s too large for buffer (%d <= %d)", 1916 translated, target_max, tl_len); 1917 err = -EINVAL; 1918 goto out; 1919 } 1920 strcpy(target, translated); 1921 err = tl_len; 1922 1923out: 1924 kfree(link_path_buffer); 1925 kfree(translated); 1926 return err; 1927} 1928 1929static noinline int ntfs_readlink_hlp(const struct dentry *link_de, 1930 struct inode *inode, char *buffer, 1931 int buflen) 1932{ 1933 int i, err = -EINVAL; 1934 struct ntfs_inode *ni = ntfs_i(inode); 1935 struct super_block *sb = inode->i_sb; 1936 struct ntfs_sb_info *sbi = sb->s_fs_info; 1937 u64 size; 1938 u16 ulen = 0; 1939 void *to_free = NULL; 1940 struct REPARSE_DATA_BUFFER *rp; 1941 const __le16 *uname; 1942 struct ATTRIB *attr; 1943 1944 /* Reparse data present. Try to parse it. */ 1945 static_assert(!offsetof(struct REPARSE_DATA_BUFFER, ReparseTag)); 1946 static_assert(sizeof(u32) == sizeof(rp->ReparseTag)); 1947 1948 *buffer = 0; 1949 1950 attr = ni_find_attr(ni, NULL, NULL, ATTR_REPARSE, NULL, 0, NULL, NULL); 1951 if (!attr) 1952 goto out; 1953 1954 if (!attr->non_res) { 1955 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1956 if (!rp) 1957 goto out; 1958 size = le32_to_cpu(attr->res.data_size); 1959 } else { 1960 size = le64_to_cpu(attr->nres.data_size); 1961 rp = NULL; 1962 } 1963 1964 if (size > sbi->reparse.max_size || size <= sizeof(u32)) 1965 goto out; 1966 1967 if (!rp) { 1968 rp = kmalloc(size, GFP_NOFS); 1969 if (!rp) { 1970 err = -ENOMEM; 1971 goto out; 1972 } 1973 to_free = rp; 1974 /* Read into temporal buffer. */ 1975 err = ntfs_read_run_nb(sbi, &ni->file.run, 0, rp, size, NULL); 1976 if (err) 1977 goto out; 1978 } 1979 1980 /* Microsoft Tag. */ 1981 switch (rp->ReparseTag) { 1982 case IO_REPARSE_TAG_MOUNT_POINT: 1983 /* Mount points and junctions. */ 1984 /* Can we use 'Rp->MountPointReparseBuffer.PrintNameLength'? */ 1985 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 1986 MountPointReparseBuffer.PathBuffer)) 1987 goto out; 1988 uname = Add2Ptr(rp, 1989 offsetof(struct REPARSE_DATA_BUFFER, 1990 MountPointReparseBuffer.PathBuffer) + 1991 le16_to_cpu(rp->MountPointReparseBuffer 1992 .PrintNameOffset)); 1993 ulen = le16_to_cpu(rp->MountPointReparseBuffer.PrintNameLength); 1994 break; 1995 1996 case IO_REPARSE_TAG_SYMLINK: 1997 /* FolderSymbolicLink */ 1998 /* Can we use 'Rp->SymbolicLinkReparseBuffer.PrintNameLength'? */ 1999 if (size <= offsetof(struct REPARSE_DATA_BUFFER, 2000 SymbolicLinkReparseBuffer.PathBuffer)) 2001 goto out; 2002 uname = Add2Ptr( 2003 rp, offsetof(struct REPARSE_DATA_BUFFER, 2004 SymbolicLinkReparseBuffer.PathBuffer) + 2005 le16_to_cpu(rp->SymbolicLinkReparseBuffer 2006 .PrintNameOffset)); 2007 ulen = le16_to_cpu( 2008 rp->SymbolicLinkReparseBuffer.PrintNameLength); 2009 break; 2010 2011 case IO_REPARSE_TAG_CLOUD: 2012 case IO_REPARSE_TAG_CLOUD_1: 2013 case IO_REPARSE_TAG_CLOUD_2: 2014 case IO_REPARSE_TAG_CLOUD_3: 2015 case IO_REPARSE_TAG_CLOUD_4: 2016 case IO_REPARSE_TAG_CLOUD_5: 2017 case IO_REPARSE_TAG_CLOUD_6: 2018 case IO_REPARSE_TAG_CLOUD_7: 2019 case IO_REPARSE_TAG_CLOUD_8: 2020 case IO_REPARSE_TAG_CLOUD_9: 2021 case IO_REPARSE_TAG_CLOUD_A: 2022 case IO_REPARSE_TAG_CLOUD_B: 2023 case IO_REPARSE_TAG_CLOUD_C: 2024 case IO_REPARSE_TAG_CLOUD_D: 2025 case IO_REPARSE_TAG_CLOUD_E: 2026 case IO_REPARSE_TAG_CLOUD_F: 2027 err = sizeof("OneDrive") - 1; 2028 if (err > buflen) 2029 err = buflen; 2030 memcpy(buffer, "OneDrive", err); 2031 goto out; 2032 2033 default: 2034 if (IsReparseTagMicrosoft(rp->ReparseTag)) { 2035 /* Unknown Microsoft Tag. */ 2036 goto out; 2037 } 2038 if (!IsReparseTagNameSurrogate(rp->ReparseTag) || 2039 size <= sizeof(struct REPARSE_POINT)) { 2040 goto out; 2041 } 2042 2043 /* Users tag. */ 2044 uname = Add2Ptr(rp, sizeof(struct REPARSE_POINT)); 2045 ulen = le16_to_cpu(rp->ReparseDataLength) - 2046 sizeof(struct REPARSE_POINT); 2047 } 2048 2049 /* Convert nlen from bytes to UNICODE chars. */ 2050 ulen >>= 1; 2051 2052 /* Check that name is available. */ 2053 if (!ulen || uname + ulen > (__le16 *)Add2Ptr(rp, size)) 2054 goto out; 2055 2056 /* If name is already zero terminated then truncate it now. */ 2057 if (!uname[ulen - 1]) 2058 ulen -= 1; 2059 2060 err = ntfs_utf16_to_nls(sbi, uname, ulen, buffer, buflen); 2061 2062 if (err < 0) 2063 goto out; 2064 2065 /* Translate Windows '\' into Linux '/'. */ 2066 for (i = 0; i < err; i++) { 2067 if (buffer[i] == '\\') 2068 buffer[i] = '/'; 2069 } 2070 2071 /* Always set last zero. */ 2072 buffer[err] = 0; 2073 2074 /* If this is a junction, translate the link target. */ 2075 if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) 2076 err = ntfs_translate_junction(sb, link_de, buffer, err, buflen); 2077 2078out: 2079 kfree(to_free); 2080 return err; 2081} 2082 2083static const char *ntfs_get_link(struct dentry *de, struct inode *inode, 2084 struct delayed_call *done) 2085{ 2086 int err; 2087 char *ret; 2088 2089 if (!de) 2090 return ERR_PTR(-ECHILD); 2091 2092 ret = kmalloc(PAGE_SIZE, GFP_NOFS); 2093 if (!ret) 2094 return ERR_PTR(-ENOMEM); 2095 2096 err = ntfs_readlink_hlp(de, inode, ret, PAGE_SIZE); 2097 if (err < 0) { 2098 kfree(ret); 2099 return ERR_PTR(err); 2100 } 2101 2102 set_delayed_call(done, kfree_link, ret); 2103 2104 return ret; 2105} 2106 2107// clang-format off 2108const struct inode_operations ntfs_link_inode_operations = { 2109 .get_link = ntfs_get_link, 2110 .setattr = ntfs3_setattr, 2111 .listxattr = ntfs_listxattr, 2112}; 2113 2114const struct address_space_operations ntfs_aops = { 2115 .read_folio = ntfs_read_folio, 2116 .readahead = ntfs_readahead, 2117 .writepages = ntfs_writepages, 2118 .write_begin = ntfs_write_begin, 2119 .write_end = ntfs_write_end, 2120 .direct_IO = ntfs_direct_IO, 2121 .bmap = ntfs_bmap, 2122 .dirty_folio = block_dirty_folio, 2123 .migrate_folio = buffer_migrate_folio, 2124 .invalidate_folio = block_invalidate_folio, 2125}; 2126 2127const struct address_space_operations ntfs_aops_cmpr = { 2128 .read_folio = ntfs_read_folio, 2129 .readahead = ntfs_readahead, 2130}; 2131// clang-format on 2132