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/fiemap.h> 9 #include <linux/fs.h> 10 #include <linux/minmax.h> 11 #include <linux/vmalloc.h> 12 13 #include "debug.h" 14 #include "ntfs.h" 15 #include "ntfs_fs.h" 16 #ifdef CONFIG_NTFS3_LZX_XPRESS 17 #include "lib/lib.h" 18 #endif 19 20 static struct mft_inode *ni_ins_mi(struct ntfs_inode *ni, struct rb_root *tree, 21 CLST ino, struct rb_node *ins) 22 { 23 struct rb_node **p = &tree->rb_node; 24 struct rb_node *pr = NULL; 25 26 while (*p) { 27 struct mft_inode *mi; 28 29 pr = *p; 30 mi = rb_entry(pr, struct mft_inode, node); 31 if (mi->rno > ino) 32 p = &pr->rb_left; 33 else if (mi->rno < ino) 34 p = &pr->rb_right; 35 else 36 return mi; 37 } 38 39 if (!ins) 40 return NULL; 41 42 rb_link_node(ins, pr, p); 43 rb_insert_color(ins, tree); 44 return rb_entry(ins, struct mft_inode, node); 45 } 46 47 /* 48 * ni_find_mi - Find mft_inode by record number. 49 */ 50 static struct mft_inode *ni_find_mi(struct ntfs_inode *ni, CLST rno) 51 { 52 return ni_ins_mi(ni, &ni->mi_tree, rno, NULL); 53 } 54 55 /* 56 * ni_add_mi - Add new mft_inode into ntfs_inode. 57 */ 58 static void ni_add_mi(struct ntfs_inode *ni, struct mft_inode *mi) 59 { 60 ni_ins_mi(ni, &ni->mi_tree, mi->rno, &mi->node); 61 } 62 63 /* 64 * ni_remove_mi - Remove mft_inode from ntfs_inode. 65 */ 66 void ni_remove_mi(struct ntfs_inode *ni, struct mft_inode *mi) 67 { 68 rb_erase(&mi->node, &ni->mi_tree); 69 } 70 71 /* 72 * ni_std - Return: Pointer into std_info from primary record. 73 */ 74 struct ATTR_STD_INFO *ni_std(struct ntfs_inode *ni) 75 { 76 const struct ATTRIB *attr; 77 78 attr = mi_find_attr(&ni->mi, NULL, ATTR_STD, NULL, 0, NULL); 79 return attr ? resident_data_ex(attr, sizeof(struct ATTR_STD_INFO)) : 80 NULL; 81 } 82 83 /* 84 * ni_std5 85 * 86 * Return: Pointer into std_info from primary record. 87 */ 88 struct ATTR_STD_INFO5 *ni_std5(struct ntfs_inode *ni) 89 { 90 const struct ATTRIB *attr; 91 92 attr = mi_find_attr(&ni->mi, NULL, ATTR_STD, NULL, 0, NULL); 93 94 return attr ? resident_data_ex(attr, sizeof(struct ATTR_STD_INFO5)) : 95 NULL; 96 } 97 98 /* 99 * ni_clear - Clear resources allocated by ntfs_inode. 100 */ 101 void ni_clear(struct ntfs_inode *ni) 102 { 103 struct rb_node *node; 104 105 if (!ni->vfs_inode.i_nlink && ni->mi.mrec && is_rec_inuse(ni->mi.mrec)) 106 ni_delete_all(ni); 107 108 al_destroy(ni); 109 110 for (node = rb_first(&ni->mi_tree); node;) { 111 struct rb_node *next = rb_next(node); 112 struct mft_inode *mi = rb_entry(node, struct mft_inode, node); 113 114 rb_erase(node, &ni->mi_tree); 115 mi_put(mi); 116 node = next; 117 } 118 119 /* Bad inode always has mode == S_IFREG. */ 120 if (ni->ni_flags & NI_FLAG_DIR) 121 indx_clear(&ni->dir); 122 else { 123 run_close(&ni->file.run); 124 #ifdef CONFIG_NTFS3_LZX_XPRESS 125 if (ni->file.offs_page) { 126 /* On-demand allocated page for offsets. */ 127 put_page(ni->file.offs_page); 128 ni->file.offs_page = NULL; 129 } 130 #endif 131 } 132 133 mi_clear(&ni->mi); 134 } 135 136 /* 137 * ni_load_mi_ex - Find mft_inode by record number. 138 */ 139 int ni_load_mi_ex(struct ntfs_inode *ni, CLST rno, struct mft_inode **mi) 140 { 141 int err; 142 struct mft_inode *r; 143 144 r = ni_find_mi(ni, rno); 145 if (r) 146 goto out; 147 148 err = mi_get(ni->mi.sbi, rno, &r); 149 if (err) 150 return err; 151 152 ni_add_mi(ni, r); 153 154 out: 155 if (mi) 156 *mi = r; 157 return 0; 158 } 159 160 /* 161 * ni_load_mi - Load mft_inode corresponded list_entry. 162 */ 163 int ni_load_mi(struct ntfs_inode *ni, const struct ATTR_LIST_ENTRY *le, 164 struct mft_inode **mi) 165 { 166 CLST rno; 167 168 if (!le) { 169 *mi = &ni->mi; 170 return 0; 171 } 172 173 rno = ino_get(&le->ref); 174 if (rno == ni->mi.rno) { 175 *mi = &ni->mi; 176 return 0; 177 } 178 return ni_load_mi_ex(ni, rno, mi); 179 } 180 181 /* 182 * ni_find_attr 183 * 184 * Return: Attribute and record this attribute belongs to. 185 */ 186 struct ATTRIB *ni_find_attr(struct ntfs_inode *ni, struct ATTRIB *attr, 187 struct ATTR_LIST_ENTRY **le_o, enum ATTR_TYPE type, 188 const __le16 *name, u8 name_len, const CLST *vcn, 189 struct mft_inode **mi) 190 { 191 struct ATTR_LIST_ENTRY *le; 192 struct mft_inode *m; 193 194 if (!ni->attr_list.size || 195 (!name_len && (type == ATTR_LIST || type == ATTR_STD))) { 196 if (le_o) 197 *le_o = NULL; 198 if (mi) 199 *mi = &ni->mi; 200 201 /* Look for required attribute in primary record. */ 202 return mi_find_attr(&ni->mi, attr, type, name, name_len, NULL); 203 } 204 205 /* First look for list entry of required type. */ 206 le = al_find_ex(ni, le_o ? *le_o : NULL, type, name, name_len, vcn); 207 if (!le) 208 return NULL; 209 210 if (le_o) 211 *le_o = le; 212 213 /* Load record that contains this attribute. */ 214 if (ni_load_mi(ni, le, &m)) 215 return NULL; 216 217 /* Look for required attribute. */ 218 attr = mi_find_attr(m, NULL, type, name, name_len, &le->id); 219 220 if (!attr) 221 goto out; 222 223 if (!attr->non_res) { 224 if (vcn && *vcn) 225 goto out; 226 } else if (!vcn) { 227 if (attr->nres.svcn) 228 goto out; 229 } else if (le64_to_cpu(attr->nres.svcn) > *vcn || 230 *vcn > le64_to_cpu(attr->nres.evcn)) { 231 goto out; 232 } 233 234 if (mi) 235 *mi = m; 236 return attr; 237 238 out: 239 ntfs_inode_err(&ni->vfs_inode, "failed to parse mft record"); 240 ntfs_set_state(ni->mi.sbi, NTFS_DIRTY_ERROR); 241 return NULL; 242 } 243 244 /* 245 * ni_enum_attr_ex - Enumerates attributes in ntfs_inode. 246 */ 247 struct ATTRIB *ni_enum_attr_ex(struct ntfs_inode *ni, struct ATTRIB *attr, 248 struct ATTR_LIST_ENTRY **le, 249 struct mft_inode **mi) 250 { 251 struct mft_inode *mi2; 252 struct ATTR_LIST_ENTRY *le2; 253 254 /* Do we have an attribute list? */ 255 if (!ni->attr_list.size) { 256 *le = NULL; 257 if (mi) 258 *mi = &ni->mi; 259 /* Enum attributes in primary record. */ 260 return mi_enum_attr(&ni->mi, attr); 261 } 262 263 /* Get next list entry. */ 264 le2 = *le = al_enumerate(ni, attr ? *le : NULL); 265 if (!le2) 266 return NULL; 267 268 /* Load record that contains the required attribute. */ 269 if (ni_load_mi(ni, le2, &mi2)) 270 return NULL; 271 272 if (mi) 273 *mi = mi2; 274 275 /* Find attribute in loaded record. */ 276 return rec_find_attr_le(mi2, le2); 277 } 278 279 /* 280 * ni_load_attr - Load attribute that contains given VCN. 281 */ 282 struct ATTRIB *ni_load_attr(struct ntfs_inode *ni, enum ATTR_TYPE type, 283 const __le16 *name, u8 name_len, CLST vcn, 284 struct mft_inode **pmi) 285 { 286 struct ATTR_LIST_ENTRY *le; 287 struct ATTRIB *attr; 288 struct mft_inode *mi; 289 struct ATTR_LIST_ENTRY *next; 290 291 if (!ni->attr_list.size) { 292 if (pmi) 293 *pmi = &ni->mi; 294 return mi_find_attr(&ni->mi, NULL, type, name, name_len, NULL); 295 } 296 297 le = al_find_ex(ni, NULL, type, name, name_len, NULL); 298 if (!le) 299 return NULL; 300 301 /* 302 * Unfortunately ATTR_LIST_ENTRY contains only start VCN. 303 * So to find the ATTRIB segment that contains 'vcn' we should 304 * enumerate some entries. 305 */ 306 if (vcn) { 307 for (;; le = next) { 308 next = al_find_ex(ni, le, type, name, name_len, NULL); 309 if (!next || le64_to_cpu(next->vcn) > vcn) 310 break; 311 } 312 } 313 314 if (ni_load_mi(ni, le, &mi)) 315 return NULL; 316 317 if (pmi) 318 *pmi = mi; 319 320 attr = mi_find_attr(mi, NULL, type, name, name_len, &le->id); 321 if (!attr) 322 return NULL; 323 324 if (!attr->non_res) 325 return attr; 326 327 if (le64_to_cpu(attr->nres.svcn) <= vcn && 328 vcn <= le64_to_cpu(attr->nres.evcn)) 329 return attr; 330 331 return NULL; 332 } 333 334 /* 335 * ni_load_all_mi - Load all subrecords. 336 */ 337 int ni_load_all_mi(struct ntfs_inode *ni) 338 { 339 int err; 340 struct ATTR_LIST_ENTRY *le; 341 342 if (!ni->attr_list.size) 343 return 0; 344 345 le = NULL; 346 347 while ((le = al_enumerate(ni, le))) { 348 CLST rno = ino_get(&le->ref); 349 350 if (rno == ni->mi.rno) 351 continue; 352 353 err = ni_load_mi_ex(ni, rno, NULL); 354 if (err) 355 return err; 356 } 357 358 return 0; 359 } 360 361 /* 362 * ni_add_subrecord - Allocate + format + attach a new subrecord. 363 */ 364 bool ni_add_subrecord(struct ntfs_inode *ni, CLST rno, struct mft_inode **mi) 365 { 366 struct mft_inode *m; 367 368 m = kzalloc(sizeof(struct mft_inode), GFP_NOFS); 369 if (!m) 370 return false; 371 372 if (mi_format_new(m, ni->mi.sbi, rno, 0, ni->mi.rno == MFT_REC_MFT)) { 373 mi_put(m); 374 return false; 375 } 376 377 mi_get_ref(&ni->mi, &m->mrec->parent_ref); 378 379 ni_add_mi(ni, m); 380 *mi = m; 381 return true; 382 } 383 384 /* 385 * ni_remove_attr - Remove all attributes for the given type/name/id. 386 */ 387 int ni_remove_attr(struct ntfs_inode *ni, enum ATTR_TYPE type, 388 const __le16 *name, u8 name_len, bool base_only, 389 const __le16 *id) 390 { 391 int err; 392 struct ATTRIB *attr; 393 struct ATTR_LIST_ENTRY *le; 394 struct mft_inode *mi; 395 u32 type_in; 396 int diff; 397 398 if (base_only || type == ATTR_LIST || !ni->attr_list.size) { 399 attr = mi_find_attr(&ni->mi, NULL, type, name, name_len, id); 400 if (!attr) 401 return -ENOENT; 402 403 mi_remove_attr(ni, &ni->mi, attr); 404 return 0; 405 } 406 407 type_in = le32_to_cpu(type); 408 le = NULL; 409 410 for (;;) { 411 le = al_enumerate(ni, le); 412 if (!le) 413 return 0; 414 415 next_le2: 416 diff = le32_to_cpu(le->type) - type_in; 417 if (diff < 0) 418 continue; 419 420 if (diff > 0) 421 return 0; 422 423 if (le->name_len != name_len) 424 continue; 425 426 if (name_len && 427 memcmp(le_name(le), name, name_len * sizeof(short))) 428 continue; 429 430 if (id && le->id != *id) 431 continue; 432 err = ni_load_mi(ni, le, &mi); 433 if (err) 434 return err; 435 436 al_remove_le(ni, le); 437 438 attr = mi_find_attr(mi, NULL, type, name, name_len, id); 439 if (!attr) 440 return -ENOENT; 441 442 mi_remove_attr(ni, mi, attr); 443 444 if (PtrOffset(ni->attr_list.le, le) >= ni->attr_list.size) 445 return 0; 446 goto next_le2; 447 } 448 } 449 450 /* 451 * ni_ins_new_attr - Insert the attribute into record. 452 * 453 * Return: Not full constructed attribute or NULL if not possible to create. 454 */ 455 static struct ATTRIB * 456 ni_ins_new_attr(struct ntfs_inode *ni, struct mft_inode *mi, 457 struct ATTR_LIST_ENTRY *le, enum ATTR_TYPE type, 458 const __le16 *name, u8 name_len, u32 asize, u16 name_off, 459 CLST svcn, struct ATTR_LIST_ENTRY **ins_le) 460 { 461 int err; 462 struct ATTRIB *attr; 463 bool le_added = false; 464 struct MFT_REF ref; 465 466 mi_get_ref(mi, &ref); 467 468 if (type != ATTR_LIST && !le && ni->attr_list.size) { 469 err = al_add_le(ni, type, name, name_len, svcn, cpu_to_le16(-1), 470 &ref, &le); 471 if (err) { 472 /* No memory or no space. */ 473 return ERR_PTR(err); 474 } 475 le_added = true; 476 477 /* 478 * al_add_le -> attr_set_size (list) -> ni_expand_list 479 * which moves some attributes out of primary record 480 * this means that name may point into moved memory 481 * reinit 'name' from le. 482 */ 483 name = le->name; 484 } 485 486 attr = mi_insert_attr(mi, type, name, name_len, asize, name_off); 487 if (!attr) { 488 if (le_added) 489 al_remove_le(ni, le); 490 return NULL; 491 } 492 493 if (type == ATTR_LIST) { 494 /* Attr list is not in list entry array. */ 495 goto out; 496 } 497 498 if (!le) 499 goto out; 500 501 /* Update ATTRIB Id and record reference. */ 502 le->id = attr->id; 503 ni->attr_list.dirty = true; 504 le->ref = ref; 505 506 out: 507 if (ins_le) 508 *ins_le = le; 509 return attr; 510 } 511 512 /* 513 * ni_repack 514 * 515 * Random write access to sparsed or compressed file may result to 516 * not optimized packed runs. 517 * Here is the place to optimize it. 518 */ 519 static int ni_repack(struct ntfs_inode *ni) 520 { 521 #if 1 522 return 0; 523 #else 524 int err = 0; 525 struct ntfs_sb_info *sbi = ni->mi.sbi; 526 struct mft_inode *mi, *mi_p = NULL; 527 struct ATTRIB *attr = NULL, *attr_p; 528 struct ATTR_LIST_ENTRY *le = NULL, *le_p; 529 CLST alloc = 0; 530 u8 cluster_bits = sbi->cluster_bits; 531 CLST svcn, evcn = 0, svcn_p, evcn_p, next_svcn; 532 u32 roff, rs = sbi->record_size; 533 struct runs_tree run; 534 535 run_init(&run); 536 537 while ((attr = ni_enum_attr_ex(ni, attr, &le, &mi))) { 538 if (!attr->non_res) 539 continue; 540 541 svcn = le64_to_cpu(attr->nres.svcn); 542 if (svcn != le64_to_cpu(le->vcn)) { 543 err = -EINVAL; 544 break; 545 } 546 547 if (!svcn) { 548 alloc = le64_to_cpu(attr->nres.alloc_size) >> 549 cluster_bits; 550 mi_p = NULL; 551 } else if (svcn != evcn + 1) { 552 err = -EINVAL; 553 break; 554 } 555 556 evcn = le64_to_cpu(attr->nres.evcn); 557 558 if (svcn > evcn + 1) { 559 err = -EINVAL; 560 break; 561 } 562 563 if (!mi_p) { 564 /* Do not try if not enough free space. */ 565 if (le32_to_cpu(mi->mrec->used) + 8 >= rs) 566 continue; 567 568 /* Do not try if last attribute segment. */ 569 if (evcn + 1 == alloc) 570 continue; 571 run_close(&run); 572 } 573 574 roff = le16_to_cpu(attr->nres.run_off); 575 576 if (roff > le32_to_cpu(attr->size)) { 577 err = -EINVAL; 578 break; 579 } 580 581 err = run_unpack(&run, sbi, ni->mi.rno, svcn, evcn, svcn, 582 Add2Ptr(attr, roff), 583 le32_to_cpu(attr->size) - roff); 584 if (err < 0) 585 break; 586 587 if (!mi_p) { 588 mi_p = mi; 589 attr_p = attr; 590 svcn_p = svcn; 591 evcn_p = evcn; 592 le_p = le; 593 err = 0; 594 continue; 595 } 596 597 /* 598 * Run contains data from two records: mi_p and mi 599 * Try to pack in one. 600 */ 601 err = mi_pack_runs(mi_p, attr_p, &run, evcn + 1 - svcn_p); 602 if (err) 603 break; 604 605 next_svcn = le64_to_cpu(attr_p->nres.evcn) + 1; 606 607 if (next_svcn >= evcn + 1) { 608 /* We can remove this attribute segment. */ 609 al_remove_le(ni, le); 610 mi_remove_attr(NULL, mi, attr); 611 le = le_p; 612 continue; 613 } 614 615 attr->nres.svcn = le->vcn = cpu_to_le64(next_svcn); 616 mi->dirty = true; 617 ni->attr_list.dirty = true; 618 619 if (evcn + 1 == alloc) { 620 err = mi_pack_runs(mi, attr, &run, 621 evcn + 1 - next_svcn); 622 if (err) 623 break; 624 mi_p = NULL; 625 } else { 626 mi_p = mi; 627 attr_p = attr; 628 svcn_p = next_svcn; 629 evcn_p = evcn; 630 le_p = le; 631 run_truncate_head(&run, next_svcn); 632 } 633 } 634 635 if (err) { 636 ntfs_inode_warn(&ni->vfs_inode, "repack problem"); 637 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 638 639 /* Pack loaded but not packed runs. */ 640 if (mi_p) 641 mi_pack_runs(mi_p, attr_p, &run, evcn_p + 1 - svcn_p); 642 } 643 644 run_close(&run); 645 return err; 646 #endif 647 } 648 649 /* 650 * ni_try_remove_attr_list 651 * 652 * Can we remove attribute list? 653 * Check the case when primary record contains enough space for all attributes. 654 */ 655 static int ni_try_remove_attr_list(struct ntfs_inode *ni) 656 { 657 int err = 0; 658 struct ntfs_sb_info *sbi = ni->mi.sbi; 659 struct ATTRIB *attr, *attr_list, *attr_ins; 660 struct ATTR_LIST_ENTRY *le; 661 struct mft_inode *mi; 662 u32 asize, free; 663 struct MFT_REF ref; 664 struct MFT_REC *mrec; 665 __le16 id; 666 667 if (!ni->attr_list.dirty) 668 return 0; 669 670 err = ni_repack(ni); 671 if (err) 672 return err; 673 674 attr_list = mi_find_attr(&ni->mi, NULL, ATTR_LIST, NULL, 0, NULL); 675 if (!attr_list) 676 return 0; 677 678 asize = le32_to_cpu(attr_list->size); 679 680 /* Free space in primary record without attribute list. */ 681 free = sbi->record_size - le32_to_cpu(ni->mi.mrec->used) + asize; 682 mi_get_ref(&ni->mi, &ref); 683 684 le = NULL; 685 while ((le = al_enumerate(ni, le))) { 686 if (!memcmp(&le->ref, &ref, sizeof(ref))) 687 continue; 688 689 if (le->vcn) 690 return 0; 691 692 mi = ni_find_mi(ni, ino_get(&le->ref)); 693 if (!mi) 694 return 0; 695 696 attr = mi_find_attr(mi, NULL, le->type, le_name(le), 697 le->name_len, &le->id); 698 if (!attr) 699 return 0; 700 701 asize = le32_to_cpu(attr->size); 702 if (asize > free) 703 return 0; 704 705 free -= asize; 706 } 707 708 /* Make a copy of primary record to restore if error. */ 709 mrec = kmemdup(ni->mi.mrec, sbi->record_size, GFP_NOFS); 710 if (!mrec) 711 return 0; /* Not critical. */ 712 713 /* It seems that attribute list can be removed from primary record. */ 714 mi_remove_attr(NULL, &ni->mi, attr_list); 715 716 /* 717 * Repeat the cycle above and copy all attributes to primary record. 718 * Do not remove original attributes from subrecords! 719 * It should be success! 720 */ 721 le = NULL; 722 while ((le = al_enumerate(ni, le))) { 723 if (!memcmp(&le->ref, &ref, sizeof(ref))) 724 continue; 725 726 mi = ni_find_mi(ni, ino_get(&le->ref)); 727 if (!mi) { 728 /* Should never happened, 'cause already checked. */ 729 goto out; 730 } 731 732 attr = mi_find_attr(mi, NULL, le->type, le_name(le), 733 le->name_len, &le->id); 734 if (!attr) { 735 /* Should never happened, 'cause already checked. */ 736 goto out; 737 } 738 asize = le32_to_cpu(attr->size); 739 740 /* Insert into primary record. */ 741 attr_ins = mi_insert_attr(&ni->mi, le->type, le_name(le), 742 le->name_len, asize, 743 le16_to_cpu(attr->name_off)); 744 if (!attr_ins) { 745 /* 746 * No space in primary record (already checked). 747 */ 748 goto out; 749 } 750 751 /* Copy all except id. */ 752 id = attr_ins->id; 753 memcpy(attr_ins, attr, asize); 754 attr_ins->id = id; 755 } 756 757 /* 758 * Repeat the cycle above and remove all attributes from subrecords. 759 */ 760 le = NULL; 761 while ((le = al_enumerate(ni, le))) { 762 if (!memcmp(&le->ref, &ref, sizeof(ref))) 763 continue; 764 765 mi = ni_find_mi(ni, ino_get(&le->ref)); 766 if (!mi) 767 continue; 768 769 attr = mi_find_attr(mi, NULL, le->type, le_name(le), 770 le->name_len, &le->id); 771 if (!attr) 772 continue; 773 774 /* Remove from original record. */ 775 mi_remove_attr(NULL, mi, attr); 776 } 777 778 run_deallocate(sbi, &ni->attr_list.run, true); 779 run_close(&ni->attr_list.run); 780 ni->attr_list.size = 0; 781 kfree(ni->attr_list.le); 782 ni->attr_list.le = NULL; 783 ni->attr_list.dirty = false; 784 785 kfree(mrec); 786 return 0; 787 out: 788 /* Restore primary record. */ 789 swap(mrec, ni->mi.mrec); 790 kfree(mrec); 791 return 0; 792 } 793 794 /* 795 * ni_create_attr_list - Generates an attribute list for this primary record. 796 */ 797 int ni_create_attr_list(struct ntfs_inode *ni) 798 { 799 struct ntfs_sb_info *sbi = ni->mi.sbi; 800 int err; 801 u32 lsize; 802 struct ATTRIB *attr; 803 struct ATTRIB *arr_move[7]; 804 struct ATTR_LIST_ENTRY *le, *le_b[7]; 805 struct MFT_REC *rec; 806 bool is_mft; 807 CLST rno = 0; 808 struct mft_inode *mi; 809 u32 free_b, nb, to_free, rs; 810 u16 sz; 811 812 is_mft = ni->mi.rno == MFT_REC_MFT; 813 rec = ni->mi.mrec; 814 rs = sbi->record_size; 815 816 /* 817 * Skip estimating exact memory requirement. 818 * Looks like one record_size is always enough. 819 */ 820 le = kmalloc(al_aligned(rs), GFP_NOFS); 821 if (!le) 822 return -ENOMEM; 823 824 mi_get_ref(&ni->mi, &le->ref); 825 ni->attr_list.le = le; 826 827 attr = NULL; 828 nb = 0; 829 free_b = 0; 830 attr = NULL; 831 832 for (; (attr = mi_enum_attr(&ni->mi, attr)); le = Add2Ptr(le, sz)) { 833 sz = le_size(attr->name_len); 834 le->type = attr->type; 835 le->size = cpu_to_le16(sz); 836 le->name_len = attr->name_len; 837 le->name_off = offsetof(struct ATTR_LIST_ENTRY, name); 838 le->vcn = 0; 839 if (le != ni->attr_list.le) 840 le->ref = ni->attr_list.le->ref; 841 le->id = attr->id; 842 843 if (attr->name_len) 844 memcpy(le->name, attr_name(attr), 845 sizeof(short) * attr->name_len); 846 else if (attr->type == ATTR_STD) 847 continue; 848 else if (attr->type == ATTR_LIST) 849 continue; 850 else if (is_mft && attr->type == ATTR_DATA) 851 continue; 852 853 if (!nb || nb < ARRAY_SIZE(arr_move)) { 854 le_b[nb] = le; 855 arr_move[nb++] = attr; 856 free_b += le32_to_cpu(attr->size); 857 } 858 } 859 860 lsize = PtrOffset(ni->attr_list.le, le); 861 ni->attr_list.size = lsize; 862 863 to_free = le32_to_cpu(rec->used) + lsize + SIZEOF_RESIDENT; 864 if (to_free <= rs) { 865 to_free = 0; 866 } else { 867 to_free -= rs; 868 869 if (to_free > free_b) { 870 err = -EINVAL; 871 goto out; 872 } 873 } 874 875 /* Allocate child MFT. */ 876 err = ntfs_look_free_mft(sbi, &rno, is_mft, ni, &mi); 877 if (err) 878 goto out; 879 880 err = -EINVAL; 881 /* Call mi_remove_attr() in reverse order to keep pointers 'arr_move' valid. */ 882 while (to_free > 0) { 883 struct ATTRIB *b = arr_move[--nb]; 884 u32 asize = le32_to_cpu(b->size); 885 u16 name_off = le16_to_cpu(b->name_off); 886 887 attr = mi_insert_attr(mi, b->type, Add2Ptr(b, name_off), 888 b->name_len, asize, name_off); 889 if (!attr) 890 goto out; 891 892 mi_get_ref(mi, &le_b[nb]->ref); 893 le_b[nb]->id = attr->id; 894 895 /* Copy all except id. */ 896 memcpy(attr, b, asize); 897 attr->id = le_b[nb]->id; 898 899 /* Remove from primary record. */ 900 if (!mi_remove_attr(NULL, &ni->mi, b)) 901 goto out; 902 903 if (to_free <= asize) 904 break; 905 to_free -= asize; 906 if (!nb) 907 goto out; 908 } 909 910 attr = mi_insert_attr(&ni->mi, ATTR_LIST, NULL, 0, 911 lsize + SIZEOF_RESIDENT, SIZEOF_RESIDENT); 912 if (!attr) 913 goto out; 914 915 attr->non_res = 0; 916 attr->flags = 0; 917 attr->res.data_size = cpu_to_le32(lsize); 918 attr->res.data_off = SIZEOF_RESIDENT_LE; 919 attr->res.flags = 0; 920 attr->res.res = 0; 921 922 memcpy(resident_data_ex(attr, lsize), ni->attr_list.le, lsize); 923 924 ni->attr_list.dirty = false; 925 926 mark_inode_dirty(&ni->vfs_inode); 927 return 0; 928 929 out: 930 kfree(ni->attr_list.le); 931 ni->attr_list.le = NULL; 932 ni->attr_list.size = 0; 933 return err; 934 } 935 936 /* 937 * ni_ins_attr_ext - Add an external attribute to the ntfs_inode. 938 */ 939 static int ni_ins_attr_ext(struct ntfs_inode *ni, struct ATTR_LIST_ENTRY *le, 940 enum ATTR_TYPE type, const __le16 *name, u8 name_len, 941 u32 asize, CLST svcn, u16 name_off, bool force_ext, 942 struct ATTRIB **ins_attr, struct mft_inode **ins_mi, 943 struct ATTR_LIST_ENTRY **ins_le) 944 { 945 struct ATTRIB *attr; 946 struct mft_inode *mi; 947 CLST rno; 948 u64 vbo; 949 struct rb_node *node; 950 int err; 951 bool is_mft, is_mft_data; 952 struct ntfs_sb_info *sbi = ni->mi.sbi; 953 954 is_mft = ni->mi.rno == MFT_REC_MFT; 955 is_mft_data = is_mft && type == ATTR_DATA && !name_len; 956 957 if (asize > sbi->max_bytes_per_attr) { 958 err = -EINVAL; 959 goto out; 960 } 961 962 /* 963 * Standard information and attr_list cannot be made external. 964 * The Log File cannot have any external attributes. 965 */ 966 if (type == ATTR_STD || type == ATTR_LIST || 967 ni->mi.rno == MFT_REC_LOG) { 968 err = -EINVAL; 969 goto out; 970 } 971 972 /* Create attribute list if it is not already existed. */ 973 if (!ni->attr_list.size) { 974 err = ni_create_attr_list(ni); 975 if (err) 976 goto out; 977 } 978 979 vbo = is_mft_data ? ((u64)svcn << sbi->cluster_bits) : 0; 980 981 if (force_ext) 982 goto insert_ext; 983 984 /* Load all subrecords into memory. */ 985 err = ni_load_all_mi(ni); 986 if (err) 987 goto out; 988 989 /* Check each of loaded subrecord. */ 990 for (node = rb_first(&ni->mi_tree); node; node = rb_next(node)) { 991 mi = rb_entry(node, struct mft_inode, node); 992 993 if (is_mft_data && 994 (mi_enum_attr(mi, NULL) || 995 vbo <= ((u64)mi->rno << sbi->record_bits))) { 996 /* We can't accept this record 'cause MFT's bootstrapping. */ 997 continue; 998 } 999 if (is_mft && 1000 mi_find_attr(mi, NULL, ATTR_DATA, NULL, 0, NULL)) { 1001 /* 1002 * This child record already has a ATTR_DATA. 1003 * So it can't accept any other records. 1004 */ 1005 continue; 1006 } 1007 1008 if ((type != ATTR_NAME || name_len) && 1009 mi_find_attr(mi, NULL, type, name, name_len, NULL)) { 1010 /* Only indexed attributes can share same record. */ 1011 continue; 1012 } 1013 1014 /* 1015 * Do not try to insert this attribute 1016 * if there is no room in record. 1017 */ 1018 if (le32_to_cpu(mi->mrec->used) + asize > sbi->record_size) 1019 continue; 1020 1021 /* Try to insert attribute into this subrecord. */ 1022 attr = ni_ins_new_attr(ni, mi, le, type, name, name_len, asize, 1023 name_off, svcn, ins_le); 1024 if (!attr) 1025 continue; 1026 if (IS_ERR(attr)) 1027 return PTR_ERR(attr); 1028 1029 if (ins_attr) 1030 *ins_attr = attr; 1031 if (ins_mi) 1032 *ins_mi = mi; 1033 return 0; 1034 } 1035 1036 insert_ext: 1037 /* We have to allocate a new child subrecord. */ 1038 err = ntfs_look_free_mft(sbi, &rno, is_mft_data, ni, &mi); 1039 if (err) 1040 goto out; 1041 1042 if (is_mft_data && vbo <= ((u64)rno << sbi->record_bits)) { 1043 err = -EINVAL; 1044 goto out1; 1045 } 1046 1047 attr = ni_ins_new_attr(ni, mi, le, type, name, name_len, asize, 1048 name_off, svcn, ins_le); 1049 if (!attr) { 1050 err = -EINVAL; 1051 goto out2; 1052 } 1053 1054 if (IS_ERR(attr)) { 1055 err = PTR_ERR(attr); 1056 goto out2; 1057 } 1058 1059 if (ins_attr) 1060 *ins_attr = attr; 1061 if (ins_mi) 1062 *ins_mi = mi; 1063 1064 return 0; 1065 1066 out2: 1067 ni_remove_mi(ni, mi); 1068 mi_put(mi); 1069 1070 out1: 1071 ntfs_mark_rec_free(sbi, rno, is_mft); 1072 1073 out: 1074 return err; 1075 } 1076 1077 /* 1078 * ni_insert_attr - Insert an attribute into the file. 1079 * 1080 * If the primary record has room, it will just insert the attribute. 1081 * If not, it may make the attribute external. 1082 * For $MFT::Data it may make room for the attribute by 1083 * making other attributes external. 1084 * 1085 * NOTE: 1086 * The ATTR_LIST and ATTR_STD cannot be made external. 1087 * This function does not fill new attribute full. 1088 * It only fills 'size'/'type'/'id'/'name_len' fields. 1089 */ 1090 static int ni_insert_attr(struct ntfs_inode *ni, enum ATTR_TYPE type, 1091 const __le16 *name, u8 name_len, u32 asize, 1092 u16 name_off, CLST svcn, struct ATTRIB **ins_attr, 1093 struct mft_inode **ins_mi, 1094 struct ATTR_LIST_ENTRY **ins_le) 1095 { 1096 struct ntfs_sb_info *sbi = ni->mi.sbi; 1097 int err; 1098 struct ATTRIB *attr, *eattr; 1099 struct MFT_REC *rec; 1100 bool is_mft; 1101 struct ATTR_LIST_ENTRY *le; 1102 u32 list_reserve, max_free, free, used, t32; 1103 __le16 id; 1104 u16 t16; 1105 1106 is_mft = ni->mi.rno == MFT_REC_MFT; 1107 rec = ni->mi.mrec; 1108 1109 list_reserve = SIZEOF_NONRESIDENT + 3 * (1 + 2 * sizeof(u32)); 1110 used = le32_to_cpu(rec->used); 1111 free = sbi->record_size - used; 1112 1113 if (is_mft && type != ATTR_LIST) { 1114 /* Reserve space for the ATTRIB list. */ 1115 if (free < list_reserve) 1116 free = 0; 1117 else 1118 free -= list_reserve; 1119 } 1120 1121 if (asize <= free) { 1122 attr = ni_ins_new_attr(ni, &ni->mi, NULL, type, name, name_len, 1123 asize, name_off, svcn, ins_le); 1124 if (IS_ERR(attr)) { 1125 err = PTR_ERR(attr); 1126 goto out; 1127 } 1128 1129 if (attr) { 1130 if (ins_attr) 1131 *ins_attr = attr; 1132 if (ins_mi) 1133 *ins_mi = &ni->mi; 1134 err = 0; 1135 goto out; 1136 } 1137 } 1138 1139 if (!is_mft || type != ATTR_DATA || svcn) { 1140 /* This ATTRIB will be external. */ 1141 err = ni_ins_attr_ext(ni, NULL, type, name, name_len, asize, 1142 svcn, name_off, false, ins_attr, ins_mi, 1143 ins_le); 1144 goto out; 1145 } 1146 1147 /* 1148 * Here we have: "is_mft && type == ATTR_DATA && !svcn" 1149 * 1150 * The first chunk of the $MFT::Data ATTRIB must be the base record. 1151 * Evict as many other attributes as possible. 1152 */ 1153 max_free = free; 1154 1155 /* Estimate the result of moving all possible attributes away. */ 1156 attr = NULL; 1157 1158 while ((attr = mi_enum_attr(&ni->mi, attr))) { 1159 if (attr->type == ATTR_STD) 1160 continue; 1161 if (attr->type == ATTR_LIST) 1162 continue; 1163 max_free += le32_to_cpu(attr->size); 1164 } 1165 1166 if (max_free < asize + list_reserve) { 1167 /* Impossible to insert this attribute into primary record. */ 1168 err = -EINVAL; 1169 goto out; 1170 } 1171 1172 /* Start real attribute moving. */ 1173 attr = NULL; 1174 1175 for (;;) { 1176 attr = mi_enum_attr(&ni->mi, attr); 1177 if (!attr) { 1178 /* We should never be here 'cause we have already check this case. */ 1179 err = -EINVAL; 1180 goto out; 1181 } 1182 1183 /* Skip attributes that MUST be primary record. */ 1184 if (attr->type == ATTR_STD || attr->type == ATTR_LIST) 1185 continue; 1186 1187 le = NULL; 1188 if (ni->attr_list.size) { 1189 le = al_find_le(ni, NULL, attr); 1190 if (!le) { 1191 /* Really this is a serious bug. */ 1192 err = -EINVAL; 1193 goto out; 1194 } 1195 } 1196 1197 t32 = le32_to_cpu(attr->size); 1198 t16 = le16_to_cpu(attr->name_off); 1199 err = ni_ins_attr_ext(ni, le, attr->type, Add2Ptr(attr, t16), 1200 attr->name_len, t32, attr_svcn(attr), t16, 1201 false, &eattr, NULL, NULL); 1202 if (err) 1203 return err; 1204 1205 id = eattr->id; 1206 memcpy(eattr, attr, t32); 1207 eattr->id = id; 1208 1209 /* Remove from primary record. */ 1210 mi_remove_attr(NULL, &ni->mi, attr); 1211 1212 /* attr now points to next attribute. */ 1213 if (attr->type == ATTR_END) 1214 goto out; 1215 } 1216 while (asize + list_reserve > sbi->record_size - le32_to_cpu(rec->used)) 1217 ; 1218 1219 attr = ni_ins_new_attr(ni, &ni->mi, NULL, type, name, name_len, asize, 1220 name_off, svcn, ins_le); 1221 if (!attr) { 1222 err = -EINVAL; 1223 goto out; 1224 } 1225 1226 if (IS_ERR(attr)) { 1227 err = PTR_ERR(attr); 1228 goto out; 1229 } 1230 1231 if (ins_attr) 1232 *ins_attr = attr; 1233 if (ins_mi) 1234 *ins_mi = &ni->mi; 1235 1236 out: 1237 return err; 1238 } 1239 1240 /* ni_expand_mft_list - Split ATTR_DATA of $MFT. */ 1241 static int ni_expand_mft_list(struct ntfs_inode *ni) 1242 { 1243 int err = 0; 1244 struct runs_tree *run = &ni->file.run; 1245 u32 asize, run_size, done = 0; 1246 struct ATTRIB *attr; 1247 struct rb_node *node; 1248 CLST mft_min, mft_new, svcn, evcn, plen; 1249 struct mft_inode *mi, *mi_min, *mi_new; 1250 struct ntfs_sb_info *sbi = ni->mi.sbi; 1251 1252 /* Find the nearest MFT. */ 1253 mft_min = 0; 1254 mft_new = 0; 1255 mi_min = NULL; 1256 1257 for (node = rb_first(&ni->mi_tree); node; node = rb_next(node)) { 1258 mi = rb_entry(node, struct mft_inode, node); 1259 1260 attr = mi_enum_attr(mi, NULL); 1261 1262 if (!attr) { 1263 mft_min = mi->rno; 1264 mi_min = mi; 1265 break; 1266 } 1267 } 1268 1269 if (ntfs_look_free_mft(sbi, &mft_new, true, ni, &mi_new)) { 1270 mft_new = 0; 1271 /* Really this is not critical. */ 1272 } else if (mft_min > mft_new) { 1273 mft_min = mft_new; 1274 mi_min = mi_new; 1275 } else { 1276 ntfs_mark_rec_free(sbi, mft_new, true); 1277 mft_new = 0; 1278 ni_remove_mi(ni, mi_new); 1279 } 1280 1281 attr = mi_find_attr(&ni->mi, NULL, ATTR_DATA, NULL, 0, NULL); 1282 if (!attr) { 1283 err = -EINVAL; 1284 goto out; 1285 } 1286 1287 asize = le32_to_cpu(attr->size); 1288 1289 evcn = le64_to_cpu(attr->nres.evcn); 1290 svcn = bytes_to_cluster(sbi, (u64)(mft_min + 1) << sbi->record_bits); 1291 if (evcn + 1 >= svcn) { 1292 err = -EINVAL; 1293 goto out; 1294 } 1295 1296 /* 1297 * Split primary attribute [0 evcn] in two parts [0 svcn) + [svcn evcn]. 1298 * 1299 * Update first part of ATTR_DATA in 'primary MFT. 1300 */ 1301 err = run_pack(run, 0, svcn, Add2Ptr(attr, SIZEOF_NONRESIDENT), 1302 asize - SIZEOF_NONRESIDENT, &plen); 1303 if (err < 0) 1304 goto out; 1305 1306 run_size = ALIGN(err, 8); 1307 err = 0; 1308 1309 if (plen < svcn) { 1310 err = -EINVAL; 1311 goto out; 1312 } 1313 1314 attr->nres.evcn = cpu_to_le64(svcn - 1); 1315 attr->size = cpu_to_le32(run_size + SIZEOF_NONRESIDENT); 1316 /* 'done' - How many bytes of primary MFT becomes free. */ 1317 done = asize - run_size - SIZEOF_NONRESIDENT; 1318 le32_sub_cpu(&ni->mi.mrec->used, done); 1319 1320 /* Estimate packed size (run_buf=NULL). */ 1321 err = run_pack(run, svcn, evcn + 1 - svcn, NULL, sbi->record_size, 1322 &plen); 1323 if (err < 0) 1324 goto out; 1325 1326 run_size = ALIGN(err, 8); 1327 err = 0; 1328 1329 if (plen < evcn + 1 - svcn) { 1330 err = -EINVAL; 1331 goto out; 1332 } 1333 1334 /* 1335 * This function may implicitly call expand attr_list. 1336 * Insert second part of ATTR_DATA in 'mi_min'. 1337 */ 1338 attr = ni_ins_new_attr(ni, mi_min, NULL, ATTR_DATA, NULL, 0, 1339 SIZEOF_NONRESIDENT + run_size, 1340 SIZEOF_NONRESIDENT, svcn, NULL); 1341 if (!attr) { 1342 err = -EINVAL; 1343 goto out; 1344 } 1345 1346 if (IS_ERR(attr)) { 1347 err = PTR_ERR(attr); 1348 goto out; 1349 } 1350 1351 attr->non_res = 1; 1352 attr->name_off = SIZEOF_NONRESIDENT_LE; 1353 attr->flags = 0; 1354 1355 /* This function can't fail - cause already checked above. */ 1356 run_pack(run, svcn, evcn + 1 - svcn, Add2Ptr(attr, SIZEOF_NONRESIDENT), 1357 run_size, &plen); 1358 1359 attr->nres.svcn = cpu_to_le64(svcn); 1360 attr->nres.evcn = cpu_to_le64(evcn); 1361 attr->nres.run_off = cpu_to_le16(SIZEOF_NONRESIDENT); 1362 1363 out: 1364 if (mft_new) { 1365 ntfs_mark_rec_free(sbi, mft_new, true); 1366 ni_remove_mi(ni, mi_new); 1367 } 1368 1369 return !err && !done ? -EOPNOTSUPP : err; 1370 } 1371 1372 /* 1373 * ni_expand_list - Move all possible attributes out of primary record. 1374 */ 1375 int ni_expand_list(struct ntfs_inode *ni) 1376 { 1377 int err = 0; 1378 u32 asize, done = 0; 1379 struct ATTRIB *attr, *ins_attr; 1380 struct ATTR_LIST_ENTRY *le; 1381 bool is_mft = ni->mi.rno == MFT_REC_MFT; 1382 struct MFT_REF ref; 1383 1384 mi_get_ref(&ni->mi, &ref); 1385 le = NULL; 1386 1387 while ((le = al_enumerate(ni, le))) { 1388 if (le->type == ATTR_STD) 1389 continue; 1390 1391 if (memcmp(&ref, &le->ref, sizeof(struct MFT_REF))) 1392 continue; 1393 1394 if (is_mft && le->type == ATTR_DATA) 1395 continue; 1396 1397 /* Find attribute in primary record. */ 1398 attr = rec_find_attr_le(&ni->mi, le); 1399 if (!attr) { 1400 err = -EINVAL; 1401 goto out; 1402 } 1403 1404 asize = le32_to_cpu(attr->size); 1405 1406 /* Always insert into new record to avoid collisions (deep recursive). */ 1407 err = ni_ins_attr_ext(ni, le, attr->type, attr_name(attr), 1408 attr->name_len, asize, attr_svcn(attr), 1409 le16_to_cpu(attr->name_off), true, 1410 &ins_attr, NULL, NULL); 1411 1412 if (err) 1413 goto out; 1414 1415 memcpy(ins_attr, attr, asize); 1416 ins_attr->id = le->id; 1417 /* Remove from primary record. */ 1418 mi_remove_attr(NULL, &ni->mi, attr); 1419 1420 done += asize; 1421 goto out; 1422 } 1423 1424 if (!is_mft) { 1425 err = -EFBIG; /* Attr list is too big(?) */ 1426 goto out; 1427 } 1428 1429 /* Split MFT data as much as possible. */ 1430 err = ni_expand_mft_list(ni); 1431 1432 out: 1433 return !err && !done ? -EOPNOTSUPP : err; 1434 } 1435 1436 /* 1437 * ni_insert_nonresident - Insert new nonresident attribute. 1438 */ 1439 int ni_insert_nonresident(struct ntfs_inode *ni, enum ATTR_TYPE type, 1440 const __le16 *name, u8 name_len, 1441 const struct runs_tree *run, CLST svcn, CLST len, 1442 __le16 flags, struct ATTRIB **new_attr, 1443 struct mft_inode **mi, struct ATTR_LIST_ENTRY **le) 1444 { 1445 int err; 1446 CLST plen; 1447 struct ATTRIB *attr; 1448 bool is_ext = (flags & (ATTR_FLAG_SPARSED | ATTR_FLAG_COMPRESSED)) && 1449 !svcn; 1450 u32 name_size = ALIGN(name_len * sizeof(short), 8); 1451 u32 name_off = is_ext ? SIZEOF_NONRESIDENT_EX : SIZEOF_NONRESIDENT; 1452 u32 run_off = name_off + name_size; 1453 u32 run_size, asize; 1454 struct ntfs_sb_info *sbi = ni->mi.sbi; 1455 1456 /* Estimate packed size (run_buf=NULL). */ 1457 err = run_pack(run, svcn, len, NULL, sbi->max_bytes_per_attr - run_off, 1458 &plen); 1459 if (err < 0) 1460 goto out; 1461 1462 run_size = ALIGN(err, 8); 1463 1464 if (plen < len) { 1465 err = -EINVAL; 1466 goto out; 1467 } 1468 1469 asize = run_off + run_size; 1470 1471 if (asize > sbi->max_bytes_per_attr) { 1472 err = -EINVAL; 1473 goto out; 1474 } 1475 1476 err = ni_insert_attr(ni, type, name, name_len, asize, name_off, svcn, 1477 &attr, mi, le); 1478 1479 if (err) 1480 goto out; 1481 1482 attr->non_res = 1; 1483 attr->name_off = cpu_to_le16(name_off); 1484 attr->flags = flags; 1485 1486 /* This function can't fail - cause already checked above. */ 1487 run_pack(run, svcn, len, Add2Ptr(attr, run_off), run_size, &plen); 1488 1489 attr->nres.svcn = cpu_to_le64(svcn); 1490 attr->nres.evcn = cpu_to_le64((u64)svcn + len - 1); 1491 1492 if (new_attr) 1493 *new_attr = attr; 1494 1495 *(__le64 *)&attr->nres.run_off = cpu_to_le64(run_off); 1496 1497 attr->nres.alloc_size = 1498 svcn ? 0 : cpu_to_le64((u64)len << ni->mi.sbi->cluster_bits); 1499 attr->nres.data_size = attr->nres.alloc_size; 1500 attr->nres.valid_size = attr->nres.alloc_size; 1501 1502 if (is_ext) { 1503 if (flags & ATTR_FLAG_COMPRESSED) 1504 attr->nres.c_unit = COMPRESSION_UNIT; 1505 attr->nres.total_size = attr->nres.alloc_size; 1506 } 1507 1508 out: 1509 return err; 1510 } 1511 1512 /* 1513 * ni_insert_resident - Inserts new resident attribute. 1514 */ 1515 int ni_insert_resident(struct ntfs_inode *ni, u32 data_size, 1516 enum ATTR_TYPE type, const __le16 *name, u8 name_len, 1517 struct ATTRIB **new_attr, struct mft_inode **mi, 1518 struct ATTR_LIST_ENTRY **le) 1519 { 1520 int err; 1521 u32 name_size = ALIGN(name_len * sizeof(short), 8); 1522 u32 asize = SIZEOF_RESIDENT + name_size + ALIGN(data_size, 8); 1523 struct ATTRIB *attr; 1524 1525 err = ni_insert_attr(ni, type, name, name_len, asize, SIZEOF_RESIDENT, 1526 0, &attr, mi, le); 1527 if (err) 1528 return err; 1529 1530 attr->non_res = 0; 1531 attr->flags = 0; 1532 1533 attr->res.data_size = cpu_to_le32(data_size); 1534 attr->res.data_off = cpu_to_le16(SIZEOF_RESIDENT + name_size); 1535 if (type == ATTR_NAME) { 1536 attr->res.flags = RESIDENT_FLAG_INDEXED; 1537 1538 /* is_attr_indexed(attr)) == true */ 1539 le16_add_cpu(&ni->mi.mrec->hard_links, 1); 1540 ni->mi.dirty = true; 1541 } 1542 attr->res.res = 0; 1543 1544 if (new_attr) 1545 *new_attr = attr; 1546 1547 return 0; 1548 } 1549 1550 /* 1551 * ni_remove_attr_le - Remove attribute from record. 1552 */ 1553 void ni_remove_attr_le(struct ntfs_inode *ni, struct ATTRIB *attr, 1554 struct mft_inode *mi, struct ATTR_LIST_ENTRY *le) 1555 { 1556 mi_remove_attr(ni, mi, attr); 1557 1558 if (le) 1559 al_remove_le(ni, le); 1560 } 1561 1562 /* 1563 * ni_delete_all - Remove all attributes and frees allocates space. 1564 * 1565 * ntfs_evict_inode->ntfs_clear_inode->ni_delete_all (if no links). 1566 */ 1567 int ni_delete_all(struct ntfs_inode *ni) 1568 { 1569 int err; 1570 struct ATTR_LIST_ENTRY *le = NULL; 1571 struct ATTRIB *attr = NULL; 1572 struct rb_node *node; 1573 u16 roff; 1574 u32 asize; 1575 CLST svcn, evcn; 1576 struct ntfs_sb_info *sbi = ni->mi.sbi; 1577 bool nt3 = is_ntfs3(sbi); 1578 struct MFT_REF ref; 1579 1580 while ((attr = ni_enum_attr_ex(ni, attr, &le, NULL))) { 1581 if (!nt3 || attr->name_len) { 1582 ; 1583 } else if (attr->type == ATTR_REPARSE) { 1584 mi_get_ref(&ni->mi, &ref); 1585 ntfs_remove_reparse(sbi, 0, &ref); 1586 } else if (attr->type == ATTR_ID && !attr->non_res && 1587 le32_to_cpu(attr->res.data_size) >= 1588 sizeof(struct GUID)) { 1589 ntfs_objid_remove(sbi, resident_data(attr)); 1590 } 1591 1592 if (!attr->non_res) 1593 continue; 1594 1595 svcn = le64_to_cpu(attr->nres.svcn); 1596 evcn = le64_to_cpu(attr->nres.evcn); 1597 1598 if (evcn + 1 <= svcn) 1599 continue; 1600 1601 asize = le32_to_cpu(attr->size); 1602 roff = le16_to_cpu(attr->nres.run_off); 1603 1604 if (roff > asize) 1605 return -EINVAL; 1606 1607 /* run==1 means unpack and deallocate. */ 1608 run_unpack_ex(RUN_DEALLOCATE, sbi, ni->mi.rno, svcn, evcn, svcn, 1609 Add2Ptr(attr, roff), asize - roff); 1610 } 1611 1612 if (ni->attr_list.size) { 1613 run_deallocate(ni->mi.sbi, &ni->attr_list.run, true); 1614 al_destroy(ni); 1615 } 1616 1617 /* Free all subrecords. */ 1618 for (node = rb_first(&ni->mi_tree); node;) { 1619 struct rb_node *next = rb_next(node); 1620 struct mft_inode *mi = rb_entry(node, struct mft_inode, node); 1621 1622 clear_rec_inuse(mi->mrec); 1623 mi->dirty = true; 1624 mi_write(mi, 0); 1625 1626 ntfs_mark_rec_free(sbi, mi->rno, false); 1627 ni_remove_mi(ni, mi); 1628 mi_put(mi); 1629 node = next; 1630 } 1631 1632 /* Free base record. */ 1633 clear_rec_inuse(ni->mi.mrec); 1634 ni->mi.dirty = true; 1635 err = mi_write(&ni->mi, 0); 1636 1637 ntfs_mark_rec_free(sbi, ni->mi.rno, false); 1638 1639 return err; 1640 } 1641 1642 /* ni_fname_name 1643 * 1644 * Return: File name attribute by its value. 1645 */ 1646 struct ATTR_FILE_NAME *ni_fname_name(struct ntfs_inode *ni, 1647 const struct le_str *uni, 1648 const struct MFT_REF *home_dir, 1649 struct mft_inode **mi, 1650 struct ATTR_LIST_ENTRY **le) 1651 { 1652 struct ATTRIB *attr = NULL; 1653 struct ATTR_FILE_NAME *fname; 1654 1655 if (le) 1656 *le = NULL; 1657 1658 /* Enumerate all names. */ 1659 next: 1660 attr = ni_find_attr(ni, attr, le, ATTR_NAME, NULL, 0, NULL, mi); 1661 if (!attr) 1662 return NULL; 1663 1664 fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1665 if (!fname) 1666 goto next; 1667 1668 if (home_dir && memcmp(home_dir, &fname->home, sizeof(*home_dir))) 1669 goto next; 1670 1671 if (!uni) 1672 return fname; 1673 1674 if (uni->len != fname->name_len) 1675 goto next; 1676 1677 if (ntfs_cmp_names(uni->name, uni->len, fname->name, uni->len, NULL, 1678 false)) 1679 goto next; 1680 return fname; 1681 } 1682 1683 /* 1684 * ni_fname_type 1685 * 1686 * Return: File name attribute with given type. 1687 */ 1688 struct ATTR_FILE_NAME *ni_fname_type(struct ntfs_inode *ni, u8 name_type, 1689 struct mft_inode **mi, 1690 struct ATTR_LIST_ENTRY **le) 1691 { 1692 struct ATTRIB *attr = NULL; 1693 struct ATTR_FILE_NAME *fname; 1694 1695 *le = NULL; 1696 1697 if (name_type == FILE_NAME_POSIX) 1698 return NULL; 1699 1700 /* Enumerate all names. */ 1701 for (;;) { 1702 attr = ni_find_attr(ni, attr, le, ATTR_NAME, NULL, 0, NULL, mi); 1703 if (!attr) 1704 return NULL; 1705 1706 fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 1707 if (fname && name_type == fname->type) 1708 return fname; 1709 } 1710 } 1711 1712 /* 1713 * ni_new_attr_flags 1714 * 1715 * Process compressed/sparsed in special way. 1716 * NOTE: You need to set ni->std_fa = new_fa 1717 * after this function to keep internal structures in consistency. 1718 */ 1719 int ni_new_attr_flags(struct ntfs_inode *ni, enum FILE_ATTRIBUTE new_fa) 1720 { 1721 struct ATTRIB *attr; 1722 struct mft_inode *mi; 1723 __le16 new_aflags; 1724 u32 new_asize; 1725 1726 attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, &mi); 1727 if (!attr) 1728 return -EINVAL; 1729 1730 new_aflags = attr->flags; 1731 1732 if (new_fa & FILE_ATTRIBUTE_SPARSE_FILE) 1733 new_aflags |= ATTR_FLAG_SPARSED; 1734 else 1735 new_aflags &= ~ATTR_FLAG_SPARSED; 1736 1737 if (new_fa & FILE_ATTRIBUTE_COMPRESSED) 1738 new_aflags |= ATTR_FLAG_COMPRESSED; 1739 else 1740 new_aflags &= ~ATTR_FLAG_COMPRESSED; 1741 1742 if (new_aflags == attr->flags) 1743 return 0; 1744 1745 if ((new_aflags & (ATTR_FLAG_COMPRESSED | ATTR_FLAG_SPARSED)) == 1746 (ATTR_FLAG_COMPRESSED | ATTR_FLAG_SPARSED)) { 1747 ntfs_inode_warn(&ni->vfs_inode, 1748 "file can't be sparsed and compressed"); 1749 return -EOPNOTSUPP; 1750 } 1751 1752 if (!attr->non_res) 1753 goto out; 1754 1755 if (attr->nres.data_size) { 1756 ntfs_inode_warn( 1757 &ni->vfs_inode, 1758 "one can change sparsed/compressed only for empty files"); 1759 return -EOPNOTSUPP; 1760 } 1761 1762 /* Resize nonresident empty attribute in-place only. */ 1763 new_asize = (new_aflags & (ATTR_FLAG_COMPRESSED | ATTR_FLAG_SPARSED)) ? 1764 (SIZEOF_NONRESIDENT_EX + 8) : 1765 (SIZEOF_NONRESIDENT + 8); 1766 1767 if (!mi_resize_attr(mi, attr, new_asize - le32_to_cpu(attr->size))) 1768 return -EOPNOTSUPP; 1769 1770 if (new_aflags & ATTR_FLAG_SPARSED) { 1771 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1772 /* Windows uses 16 clusters per frame but supports one cluster per frame too. */ 1773 attr->nres.c_unit = 0; 1774 ni->vfs_inode.i_mapping->a_ops = &ntfs_aops; 1775 } else if (new_aflags & ATTR_FLAG_COMPRESSED) { 1776 attr->name_off = SIZEOF_NONRESIDENT_EX_LE; 1777 /* The only allowed: 16 clusters per frame. */ 1778 attr->nres.c_unit = NTFS_LZNT_CUNIT; 1779 ni->vfs_inode.i_mapping->a_ops = &ntfs_aops_cmpr; 1780 } else { 1781 attr->name_off = SIZEOF_NONRESIDENT_LE; 1782 /* Normal files. */ 1783 attr->nres.c_unit = 0; 1784 ni->vfs_inode.i_mapping->a_ops = &ntfs_aops; 1785 } 1786 attr->nres.run_off = attr->name_off; 1787 out: 1788 attr->flags = new_aflags; 1789 mi->dirty = true; 1790 1791 return 0; 1792 } 1793 1794 /* 1795 * ni_parse_reparse 1796 * 1797 * buffer - memory for reparse buffer header 1798 */ 1799 enum REPARSE_SIGN ni_parse_reparse(struct ntfs_inode *ni, struct ATTRIB *attr, 1800 struct REPARSE_DATA_BUFFER *buffer) 1801 { 1802 const struct REPARSE_DATA_BUFFER *rp = NULL; 1803 u8 bits; 1804 u16 len; 1805 typeof(rp->CompressReparseBuffer) *cmpr; 1806 1807 /* Try to estimate reparse point. */ 1808 if (!attr->non_res) { 1809 rp = resident_data_ex(attr, sizeof(struct REPARSE_DATA_BUFFER)); 1810 } else if (le64_to_cpu(attr->nres.data_size) >= 1811 sizeof(struct REPARSE_DATA_BUFFER)) { 1812 struct runs_tree run; 1813 1814 run_init(&run); 1815 1816 if (!attr_load_runs_vcn(ni, ATTR_REPARSE, NULL, 0, &run, 0) && 1817 !ntfs_read_run_nb(ni->mi.sbi, &run, 0, buffer, 1818 sizeof(struct REPARSE_DATA_BUFFER), 1819 NULL)) { 1820 rp = buffer; 1821 } 1822 1823 run_close(&run); 1824 } 1825 1826 if (!rp) 1827 return REPARSE_NONE; 1828 1829 len = le16_to_cpu(rp->ReparseDataLength); 1830 switch (rp->ReparseTag) { 1831 case (IO_REPARSE_TAG_MICROSOFT | IO_REPARSE_TAG_SYMBOLIC_LINK): 1832 break; /* Symbolic link. */ 1833 case IO_REPARSE_TAG_MOUNT_POINT: 1834 break; /* Mount points and junctions. */ 1835 case IO_REPARSE_TAG_SYMLINK: 1836 break; 1837 case IO_REPARSE_TAG_COMPRESS: 1838 /* 1839 * WOF - Windows Overlay Filter - Used to compress files with 1840 * LZX/Xpress. 1841 * 1842 * Unlike native NTFS file compression, the Windows 1843 * Overlay Filter supports only read operations. This means 1844 * that it doesn't need to sector-align each compressed chunk, 1845 * so the compressed data can be packed more tightly together. 1846 * If you open the file for writing, the WOF just decompresses 1847 * the entire file, turning it back into a plain file. 1848 * 1849 * Ntfs3 driver decompresses the entire file only on write or 1850 * change size requests. 1851 */ 1852 1853 cmpr = &rp->CompressReparseBuffer; 1854 if (len < sizeof(*cmpr) || 1855 cmpr->WofVersion != WOF_CURRENT_VERSION || 1856 cmpr->WofProvider != WOF_PROVIDER_SYSTEM || 1857 cmpr->ProviderVer != WOF_PROVIDER_CURRENT_VERSION) { 1858 return REPARSE_NONE; 1859 } 1860 1861 switch (cmpr->CompressionFormat) { 1862 case WOF_COMPRESSION_XPRESS4K: 1863 bits = 0xc; // 4k 1864 break; 1865 case WOF_COMPRESSION_XPRESS8K: 1866 bits = 0xd; // 8k 1867 break; 1868 case WOF_COMPRESSION_XPRESS16K: 1869 bits = 0xe; // 16k 1870 break; 1871 case WOF_COMPRESSION_LZX32K: 1872 bits = 0xf; // 32k 1873 break; 1874 default: 1875 bits = 0x10; // 64k 1876 break; 1877 } 1878 ni_set_ext_compress_bits(ni, bits); 1879 return REPARSE_COMPRESSED; 1880 1881 case IO_REPARSE_TAG_DEDUP: 1882 ni->ni_flags |= NI_FLAG_DEDUPLICATED; 1883 return REPARSE_DEDUPLICATED; 1884 1885 default: 1886 if (rp->ReparseTag & IO_REPARSE_TAG_NAME_SURROGATE) 1887 break; 1888 1889 return REPARSE_NONE; 1890 } 1891 1892 if (buffer != rp) 1893 memcpy(buffer, rp, sizeof(struct REPARSE_DATA_BUFFER)); 1894 1895 /* Looks like normal symlink. */ 1896 return REPARSE_LINK; 1897 } 1898 1899 /* 1900 * ni_fiemap - Helper for file_fiemap(). 1901 * 1902 * Assumed ni_lock. 1903 * TODO: Less aggressive locks. 1904 */ 1905 int ni_fiemap(struct ntfs_inode *ni, struct fiemap_extent_info *fieinfo, 1906 __u64 vbo, __u64 len) 1907 { 1908 int err = 0; 1909 struct ntfs_sb_info *sbi = ni->mi.sbi; 1910 u8 cluster_bits = sbi->cluster_bits; 1911 struct runs_tree *run; 1912 struct rw_semaphore *run_lock; 1913 struct ATTRIB *attr; 1914 CLST vcn = vbo >> cluster_bits; 1915 CLST lcn, clen; 1916 u64 valid = ni->i_valid; 1917 u64 lbo, bytes; 1918 u64 end, alloc_size; 1919 size_t idx = -1; 1920 u32 flags; 1921 bool ok; 1922 1923 if (S_ISDIR(ni->vfs_inode.i_mode)) { 1924 run = &ni->dir.alloc_run; 1925 attr = ni_find_attr(ni, NULL, NULL, ATTR_ALLOC, I30_NAME, 1926 ARRAY_SIZE(I30_NAME), NULL, NULL); 1927 run_lock = &ni->dir.run_lock; 1928 } else { 1929 run = &ni->file.run; 1930 attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, 1931 NULL); 1932 if (!attr) { 1933 err = -EINVAL; 1934 goto out; 1935 } 1936 if (is_attr_compressed(attr)) { 1937 /* Unfortunately cp -r incorrectly treats compressed clusters. */ 1938 err = -EOPNOTSUPP; 1939 ntfs_inode_warn( 1940 &ni->vfs_inode, 1941 "fiemap is not supported for compressed file (cp -r)"); 1942 goto out; 1943 } 1944 run_lock = &ni->file.run_lock; 1945 } 1946 1947 if (!attr || !attr->non_res) { 1948 err = fiemap_fill_next_extent( 1949 fieinfo, 0, 0, 1950 attr ? le32_to_cpu(attr->res.data_size) : 0, 1951 FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST | 1952 FIEMAP_EXTENT_MERGED); 1953 goto out; 1954 } 1955 1956 end = vbo + len; 1957 alloc_size = le64_to_cpu(attr->nres.alloc_size); 1958 if (end > alloc_size) 1959 end = alloc_size; 1960 1961 down_read(run_lock); 1962 1963 while (vbo < end) { 1964 if (idx == -1) { 1965 ok = run_lookup_entry(run, vcn, &lcn, &clen, &idx); 1966 } else { 1967 CLST vcn_next = vcn; 1968 1969 ok = run_get_entry(run, ++idx, &vcn, &lcn, &clen) && 1970 vcn == vcn_next; 1971 if (!ok) 1972 vcn = vcn_next; 1973 } 1974 1975 if (!ok) { 1976 up_read(run_lock); 1977 down_write(run_lock); 1978 1979 err = attr_load_runs_vcn(ni, attr->type, 1980 attr_name(attr), 1981 attr->name_len, run, vcn); 1982 1983 up_write(run_lock); 1984 down_read(run_lock); 1985 1986 if (err) 1987 break; 1988 1989 ok = run_lookup_entry(run, vcn, &lcn, &clen, &idx); 1990 1991 if (!ok) { 1992 err = -EINVAL; 1993 break; 1994 } 1995 } 1996 1997 if (!clen) { 1998 err = -EINVAL; // ? 1999 break; 2000 } 2001 2002 if (lcn == SPARSE_LCN) { 2003 vcn += clen; 2004 vbo = (u64)vcn << cluster_bits; 2005 continue; 2006 } 2007 2008 flags = FIEMAP_EXTENT_MERGED; 2009 if (S_ISDIR(ni->vfs_inode.i_mode)) { 2010 ; 2011 } else if (is_attr_compressed(attr)) { 2012 CLST clst_data; 2013 2014 err = attr_is_frame_compressed( 2015 ni, attr, vcn >> attr->nres.c_unit, &clst_data); 2016 if (err) 2017 break; 2018 if (clst_data < NTFS_LZNT_CLUSTERS) 2019 flags |= FIEMAP_EXTENT_ENCODED; 2020 } else if (is_attr_encrypted(attr)) { 2021 flags |= FIEMAP_EXTENT_DATA_ENCRYPTED; 2022 } 2023 2024 vbo = (u64)vcn << cluster_bits; 2025 bytes = (u64)clen << cluster_bits; 2026 lbo = (u64)lcn << cluster_bits; 2027 2028 vcn += clen; 2029 2030 if (vbo + bytes >= end) 2031 bytes = end - vbo; 2032 2033 if (vbo + bytes <= valid) { 2034 ; 2035 } else if (vbo >= valid) { 2036 flags |= FIEMAP_EXTENT_UNWRITTEN; 2037 } else { 2038 /* vbo < valid && valid < vbo + bytes */ 2039 u64 dlen = valid - vbo; 2040 2041 if (vbo + dlen >= end) 2042 flags |= FIEMAP_EXTENT_LAST; 2043 2044 err = fiemap_fill_next_extent(fieinfo, vbo, lbo, dlen, 2045 flags); 2046 if (err < 0) 2047 break; 2048 if (err == 1) { 2049 err = 0; 2050 break; 2051 } 2052 2053 vbo = valid; 2054 bytes -= dlen; 2055 if (!bytes) 2056 continue; 2057 2058 lbo += dlen; 2059 flags |= FIEMAP_EXTENT_UNWRITTEN; 2060 } 2061 2062 if (vbo + bytes >= end) 2063 flags |= FIEMAP_EXTENT_LAST; 2064 2065 err = fiemap_fill_next_extent(fieinfo, vbo, lbo, bytes, flags); 2066 if (err < 0) 2067 break; 2068 if (err == 1) { 2069 err = 0; 2070 break; 2071 } 2072 2073 vbo += bytes; 2074 } 2075 2076 up_read(run_lock); 2077 2078 out: 2079 return err; 2080 } 2081 2082 /* 2083 * ni_readpage_cmpr 2084 * 2085 * When decompressing, we typically obtain more than one page per reference. 2086 * We inject the additional pages into the page cache. 2087 */ 2088 int ni_readpage_cmpr(struct ntfs_inode *ni, struct page *page) 2089 { 2090 int err; 2091 struct ntfs_sb_info *sbi = ni->mi.sbi; 2092 struct address_space *mapping = page->mapping; 2093 pgoff_t index = page->index; 2094 u64 frame_vbo, vbo = (u64)index << PAGE_SHIFT; 2095 struct page **pages = NULL; /* Array of at most 16 pages. stack? */ 2096 u8 frame_bits; 2097 CLST frame; 2098 u32 i, idx, frame_size, pages_per_frame; 2099 gfp_t gfp_mask; 2100 struct page *pg; 2101 2102 if (vbo >= ni->vfs_inode.i_size) { 2103 SetPageUptodate(page); 2104 err = 0; 2105 goto out; 2106 } 2107 2108 if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) { 2109 /* Xpress or LZX. */ 2110 frame_bits = ni_ext_compress_bits(ni); 2111 } else { 2112 /* LZNT compression. */ 2113 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits; 2114 } 2115 frame_size = 1u << frame_bits; 2116 frame = vbo >> frame_bits; 2117 frame_vbo = (u64)frame << frame_bits; 2118 idx = (vbo - frame_vbo) >> PAGE_SHIFT; 2119 2120 pages_per_frame = frame_size >> PAGE_SHIFT; 2121 pages = kcalloc(pages_per_frame, sizeof(struct page *), GFP_NOFS); 2122 if (!pages) { 2123 err = -ENOMEM; 2124 goto out; 2125 } 2126 2127 pages[idx] = page; 2128 index = frame_vbo >> PAGE_SHIFT; 2129 gfp_mask = mapping_gfp_mask(mapping); 2130 2131 for (i = 0; i < pages_per_frame; i++, index++) { 2132 if (i == idx) 2133 continue; 2134 2135 pg = find_or_create_page(mapping, index, gfp_mask); 2136 if (!pg) { 2137 err = -ENOMEM; 2138 goto out1; 2139 } 2140 pages[i] = pg; 2141 } 2142 2143 err = ni_read_frame(ni, frame_vbo, pages, pages_per_frame); 2144 2145 out1: 2146 if (err) 2147 SetPageError(page); 2148 2149 for (i = 0; i < pages_per_frame; i++) { 2150 pg = pages[i]; 2151 if (i == idx) 2152 continue; 2153 unlock_page(pg); 2154 put_page(pg); 2155 } 2156 2157 out: 2158 /* At this point, err contains 0 or -EIO depending on the "critical" page. */ 2159 kfree(pages); 2160 unlock_page(page); 2161 2162 return err; 2163 } 2164 2165 #ifdef CONFIG_NTFS3_LZX_XPRESS 2166 /* 2167 * ni_decompress_file - Decompress LZX/Xpress compressed file. 2168 * 2169 * Remove ATTR_DATA::WofCompressedData. 2170 * Remove ATTR_REPARSE. 2171 */ 2172 int ni_decompress_file(struct ntfs_inode *ni) 2173 { 2174 struct ntfs_sb_info *sbi = ni->mi.sbi; 2175 struct inode *inode = &ni->vfs_inode; 2176 loff_t i_size = inode->i_size; 2177 struct address_space *mapping = inode->i_mapping; 2178 gfp_t gfp_mask = mapping_gfp_mask(mapping); 2179 struct page **pages = NULL; 2180 struct ATTR_LIST_ENTRY *le; 2181 struct ATTRIB *attr; 2182 CLST vcn, cend, lcn, clen, end; 2183 pgoff_t index; 2184 u64 vbo; 2185 u8 frame_bits; 2186 u32 i, frame_size, pages_per_frame, bytes; 2187 struct mft_inode *mi; 2188 int err; 2189 2190 /* Clusters for decompressed data. */ 2191 cend = bytes_to_cluster(sbi, i_size); 2192 2193 if (!i_size) 2194 goto remove_wof; 2195 2196 /* Check in advance. */ 2197 if (cend > wnd_zeroes(&sbi->used.bitmap)) { 2198 err = -ENOSPC; 2199 goto out; 2200 } 2201 2202 frame_bits = ni_ext_compress_bits(ni); 2203 frame_size = 1u << frame_bits; 2204 pages_per_frame = frame_size >> PAGE_SHIFT; 2205 pages = kcalloc(pages_per_frame, sizeof(struct page *), GFP_NOFS); 2206 if (!pages) { 2207 err = -ENOMEM; 2208 goto out; 2209 } 2210 2211 /* 2212 * Step 1: Decompress data and copy to new allocated clusters. 2213 */ 2214 index = 0; 2215 for (vbo = 0; vbo < i_size; vbo += bytes) { 2216 u32 nr_pages; 2217 bool new; 2218 2219 if (vbo + frame_size > i_size) { 2220 bytes = i_size - vbo; 2221 nr_pages = (bytes + PAGE_SIZE - 1) >> PAGE_SHIFT; 2222 } else { 2223 nr_pages = pages_per_frame; 2224 bytes = frame_size; 2225 } 2226 2227 end = bytes_to_cluster(sbi, vbo + bytes); 2228 2229 for (vcn = vbo >> sbi->cluster_bits; vcn < end; vcn += clen) { 2230 err = attr_data_get_block(ni, vcn, cend - vcn, &lcn, 2231 &clen, &new, false); 2232 if (err) 2233 goto out; 2234 } 2235 2236 for (i = 0; i < pages_per_frame; i++, index++) { 2237 struct page *pg; 2238 2239 pg = find_or_create_page(mapping, index, gfp_mask); 2240 if (!pg) { 2241 while (i--) { 2242 unlock_page(pages[i]); 2243 put_page(pages[i]); 2244 } 2245 err = -ENOMEM; 2246 goto out; 2247 } 2248 pages[i] = pg; 2249 } 2250 2251 err = ni_read_frame(ni, vbo, pages, pages_per_frame); 2252 2253 if (!err) { 2254 down_read(&ni->file.run_lock); 2255 err = ntfs_bio_pages(sbi, &ni->file.run, pages, 2256 nr_pages, vbo, bytes, 2257 REQ_OP_WRITE); 2258 up_read(&ni->file.run_lock); 2259 } 2260 2261 for (i = 0; i < pages_per_frame; i++) { 2262 unlock_page(pages[i]); 2263 put_page(pages[i]); 2264 } 2265 2266 if (err) 2267 goto out; 2268 2269 cond_resched(); 2270 } 2271 2272 remove_wof: 2273 /* 2274 * Step 2: Deallocate attributes ATTR_DATA::WofCompressedData 2275 * and ATTR_REPARSE. 2276 */ 2277 attr = NULL; 2278 le = NULL; 2279 while ((attr = ni_enum_attr_ex(ni, attr, &le, NULL))) { 2280 CLST svcn, evcn; 2281 u32 asize, roff; 2282 2283 if (attr->type == ATTR_REPARSE) { 2284 struct MFT_REF ref; 2285 2286 mi_get_ref(&ni->mi, &ref); 2287 ntfs_remove_reparse(sbi, 0, &ref); 2288 } 2289 2290 if (!attr->non_res) 2291 continue; 2292 2293 if (attr->type != ATTR_REPARSE && 2294 (attr->type != ATTR_DATA || 2295 attr->name_len != ARRAY_SIZE(WOF_NAME) || 2296 memcmp(attr_name(attr), WOF_NAME, sizeof(WOF_NAME)))) 2297 continue; 2298 2299 svcn = le64_to_cpu(attr->nres.svcn); 2300 evcn = le64_to_cpu(attr->nres.evcn); 2301 2302 if (evcn + 1 <= svcn) 2303 continue; 2304 2305 asize = le32_to_cpu(attr->size); 2306 roff = le16_to_cpu(attr->nres.run_off); 2307 2308 if (roff > asize) { 2309 err = -EINVAL; 2310 goto out; 2311 } 2312 2313 /*run==1 Means unpack and deallocate. */ 2314 run_unpack_ex(RUN_DEALLOCATE, sbi, ni->mi.rno, svcn, evcn, svcn, 2315 Add2Ptr(attr, roff), asize - roff); 2316 } 2317 2318 /* 2319 * Step 3: Remove attribute ATTR_DATA::WofCompressedData. 2320 */ 2321 err = ni_remove_attr(ni, ATTR_DATA, WOF_NAME, ARRAY_SIZE(WOF_NAME), 2322 false, NULL); 2323 if (err) 2324 goto out; 2325 2326 /* 2327 * Step 4: Remove ATTR_REPARSE. 2328 */ 2329 err = ni_remove_attr(ni, ATTR_REPARSE, NULL, 0, false, NULL); 2330 if (err) 2331 goto out; 2332 2333 /* 2334 * Step 5: Remove sparse flag from data attribute. 2335 */ 2336 attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, &mi); 2337 if (!attr) { 2338 err = -EINVAL; 2339 goto out; 2340 } 2341 2342 if (attr->non_res && is_attr_sparsed(attr)) { 2343 /* Sparsed attribute header is 8 bytes bigger than normal. */ 2344 struct MFT_REC *rec = mi->mrec; 2345 u32 used = le32_to_cpu(rec->used); 2346 u32 asize = le32_to_cpu(attr->size); 2347 u16 roff = le16_to_cpu(attr->nres.run_off); 2348 char *rbuf = Add2Ptr(attr, roff); 2349 2350 memmove(rbuf - 8, rbuf, used - PtrOffset(rec, rbuf)); 2351 attr->size = cpu_to_le32(asize - 8); 2352 attr->flags &= ~ATTR_FLAG_SPARSED; 2353 attr->nres.run_off = cpu_to_le16(roff - 8); 2354 attr->nres.c_unit = 0; 2355 rec->used = cpu_to_le32(used - 8); 2356 mi->dirty = true; 2357 ni->std_fa &= ~(FILE_ATTRIBUTE_SPARSE_FILE | 2358 FILE_ATTRIBUTE_REPARSE_POINT); 2359 2360 mark_inode_dirty(inode); 2361 } 2362 2363 /* Clear cached flag. */ 2364 ni->ni_flags &= ~NI_FLAG_COMPRESSED_MASK; 2365 if (ni->file.offs_page) { 2366 put_page(ni->file.offs_page); 2367 ni->file.offs_page = NULL; 2368 } 2369 mapping->a_ops = &ntfs_aops; 2370 2371 out: 2372 kfree(pages); 2373 if (err) 2374 _ntfs_bad_inode(inode); 2375 2376 return err; 2377 } 2378 2379 /* 2380 * decompress_lzx_xpress - External compression LZX/Xpress. 2381 */ 2382 static int decompress_lzx_xpress(struct ntfs_sb_info *sbi, const char *cmpr, 2383 size_t cmpr_size, void *unc, size_t unc_size, 2384 u32 frame_size) 2385 { 2386 int err; 2387 void *ctx; 2388 2389 if (cmpr_size == unc_size) { 2390 /* Frame not compressed. */ 2391 memcpy(unc, cmpr, unc_size); 2392 return 0; 2393 } 2394 2395 err = 0; 2396 if (frame_size == 0x8000) { 2397 mutex_lock(&sbi->compress.mtx_lzx); 2398 /* LZX: Frame compressed. */ 2399 ctx = sbi->compress.lzx; 2400 if (!ctx) { 2401 /* Lazy initialize LZX decompress context. */ 2402 ctx = lzx_allocate_decompressor(); 2403 if (!ctx) { 2404 err = -ENOMEM; 2405 goto out1; 2406 } 2407 2408 sbi->compress.lzx = ctx; 2409 } 2410 2411 if (lzx_decompress(ctx, cmpr, cmpr_size, unc, unc_size)) { 2412 /* Treat all errors as "invalid argument". */ 2413 err = -EINVAL; 2414 } 2415 out1: 2416 mutex_unlock(&sbi->compress.mtx_lzx); 2417 } else { 2418 /* XPRESS: Frame compressed. */ 2419 mutex_lock(&sbi->compress.mtx_xpress); 2420 ctx = sbi->compress.xpress; 2421 if (!ctx) { 2422 /* Lazy initialize Xpress decompress context. */ 2423 ctx = xpress_allocate_decompressor(); 2424 if (!ctx) { 2425 err = -ENOMEM; 2426 goto out2; 2427 } 2428 2429 sbi->compress.xpress = ctx; 2430 } 2431 2432 if (xpress_decompress(ctx, cmpr, cmpr_size, unc, unc_size)) { 2433 /* Treat all errors as "invalid argument". */ 2434 err = -EINVAL; 2435 } 2436 out2: 2437 mutex_unlock(&sbi->compress.mtx_xpress); 2438 } 2439 return err; 2440 } 2441 #endif 2442 2443 /* 2444 * ni_read_frame 2445 * 2446 * Pages - Array of locked pages. 2447 */ 2448 int ni_read_frame(struct ntfs_inode *ni, u64 frame_vbo, struct page **pages, 2449 u32 pages_per_frame) 2450 { 2451 int err; 2452 struct ntfs_sb_info *sbi = ni->mi.sbi; 2453 u8 cluster_bits = sbi->cluster_bits; 2454 char *frame_ondisk = NULL; 2455 char *frame_mem = NULL; 2456 struct page **pages_disk = NULL; 2457 struct ATTR_LIST_ENTRY *le = NULL; 2458 struct runs_tree *run = &ni->file.run; 2459 u64 valid_size = ni->i_valid; 2460 u64 vbo_disk; 2461 size_t unc_size; 2462 u32 frame_size, i, npages_disk, ondisk_size; 2463 struct page *pg; 2464 struct ATTRIB *attr; 2465 CLST frame, clst_data; 2466 2467 /* 2468 * To simplify decompress algorithm do vmap for source 2469 * and target pages. 2470 */ 2471 for (i = 0; i < pages_per_frame; i++) 2472 kmap(pages[i]); 2473 2474 frame_size = pages_per_frame << PAGE_SHIFT; 2475 frame_mem = vmap(pages, pages_per_frame, VM_MAP, PAGE_KERNEL); 2476 if (!frame_mem) { 2477 err = -ENOMEM; 2478 goto out; 2479 } 2480 2481 attr = ni_find_attr(ni, NULL, &le, ATTR_DATA, NULL, 0, NULL, NULL); 2482 if (!attr) { 2483 err = -ENOENT; 2484 goto out1; 2485 } 2486 2487 if (!attr->non_res) { 2488 u32 data_size = le32_to_cpu(attr->res.data_size); 2489 2490 memset(frame_mem, 0, frame_size); 2491 if (frame_vbo < data_size) { 2492 ondisk_size = data_size - frame_vbo; 2493 memcpy(frame_mem, resident_data(attr) + frame_vbo, 2494 min(ondisk_size, frame_size)); 2495 } 2496 err = 0; 2497 goto out1; 2498 } 2499 2500 if (frame_vbo >= valid_size) { 2501 memset(frame_mem, 0, frame_size); 2502 err = 0; 2503 goto out1; 2504 } 2505 2506 if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) { 2507 #ifndef CONFIG_NTFS3_LZX_XPRESS 2508 err = -EOPNOTSUPP; 2509 goto out1; 2510 #else 2511 u32 frame_bits = ni_ext_compress_bits(ni); 2512 u64 frame64 = frame_vbo >> frame_bits; 2513 u64 frames, vbo_data; 2514 2515 if (frame_size != (1u << frame_bits)) { 2516 err = -EINVAL; 2517 goto out1; 2518 } 2519 switch (frame_size) { 2520 case 0x1000: 2521 case 0x2000: 2522 case 0x4000: 2523 case 0x8000: 2524 break; 2525 default: 2526 /* Unknown compression. */ 2527 err = -EOPNOTSUPP; 2528 goto out1; 2529 } 2530 2531 attr = ni_find_attr(ni, attr, &le, ATTR_DATA, WOF_NAME, 2532 ARRAY_SIZE(WOF_NAME), NULL, NULL); 2533 if (!attr) { 2534 ntfs_inode_err( 2535 &ni->vfs_inode, 2536 "external compressed file should contains data attribute \"WofCompressedData\""); 2537 err = -EINVAL; 2538 goto out1; 2539 } 2540 2541 if (!attr->non_res) { 2542 run = NULL; 2543 } else { 2544 run = run_alloc(); 2545 if (!run) { 2546 err = -ENOMEM; 2547 goto out1; 2548 } 2549 } 2550 2551 frames = (ni->vfs_inode.i_size - 1) >> frame_bits; 2552 2553 err = attr_wof_frame_info(ni, attr, run, frame64, frames, 2554 frame_bits, &ondisk_size, &vbo_data); 2555 if (err) 2556 goto out2; 2557 2558 if (frame64 == frames) { 2559 unc_size = 1 + ((ni->vfs_inode.i_size - 1) & 2560 (frame_size - 1)); 2561 ondisk_size = attr_size(attr) - vbo_data; 2562 } else { 2563 unc_size = frame_size; 2564 } 2565 2566 if (ondisk_size > frame_size) { 2567 err = -EINVAL; 2568 goto out2; 2569 } 2570 2571 if (!attr->non_res) { 2572 if (vbo_data + ondisk_size > 2573 le32_to_cpu(attr->res.data_size)) { 2574 err = -EINVAL; 2575 goto out1; 2576 } 2577 2578 err = decompress_lzx_xpress( 2579 sbi, Add2Ptr(resident_data(attr), vbo_data), 2580 ondisk_size, frame_mem, unc_size, frame_size); 2581 goto out1; 2582 } 2583 vbo_disk = vbo_data; 2584 /* Load all runs to read [vbo_disk-vbo_to). */ 2585 err = attr_load_runs_range(ni, ATTR_DATA, WOF_NAME, 2586 ARRAY_SIZE(WOF_NAME), run, vbo_disk, 2587 vbo_data + ondisk_size); 2588 if (err) 2589 goto out2; 2590 npages_disk = (ondisk_size + (vbo_disk & (PAGE_SIZE - 1)) + 2591 PAGE_SIZE - 1) >> 2592 PAGE_SHIFT; 2593 #endif 2594 } else if (is_attr_compressed(attr)) { 2595 /* LZNT compression. */ 2596 if (sbi->cluster_size > NTFS_LZNT_MAX_CLUSTER) { 2597 err = -EOPNOTSUPP; 2598 goto out1; 2599 } 2600 2601 if (attr->nres.c_unit != NTFS_LZNT_CUNIT) { 2602 err = -EOPNOTSUPP; 2603 goto out1; 2604 } 2605 2606 down_write(&ni->file.run_lock); 2607 run_truncate_around(run, le64_to_cpu(attr->nres.svcn)); 2608 frame = frame_vbo >> (cluster_bits + NTFS_LZNT_CUNIT); 2609 err = attr_is_frame_compressed(ni, attr, frame, &clst_data); 2610 up_write(&ni->file.run_lock); 2611 if (err) 2612 goto out1; 2613 2614 if (!clst_data) { 2615 memset(frame_mem, 0, frame_size); 2616 goto out1; 2617 } 2618 2619 frame_size = sbi->cluster_size << NTFS_LZNT_CUNIT; 2620 ondisk_size = clst_data << cluster_bits; 2621 2622 if (clst_data >= NTFS_LZNT_CLUSTERS) { 2623 /* Frame is not compressed. */ 2624 down_read(&ni->file.run_lock); 2625 err = ntfs_bio_pages(sbi, run, pages, pages_per_frame, 2626 frame_vbo, ondisk_size, 2627 REQ_OP_READ); 2628 up_read(&ni->file.run_lock); 2629 goto out1; 2630 } 2631 vbo_disk = frame_vbo; 2632 npages_disk = (ondisk_size + PAGE_SIZE - 1) >> PAGE_SHIFT; 2633 } else { 2634 __builtin_unreachable(); 2635 err = -EINVAL; 2636 goto out1; 2637 } 2638 2639 pages_disk = kzalloc(npages_disk * sizeof(struct page *), GFP_NOFS); 2640 if (!pages_disk) { 2641 err = -ENOMEM; 2642 goto out2; 2643 } 2644 2645 for (i = 0; i < npages_disk; i++) { 2646 pg = alloc_page(GFP_KERNEL); 2647 if (!pg) { 2648 err = -ENOMEM; 2649 goto out3; 2650 } 2651 pages_disk[i] = pg; 2652 lock_page(pg); 2653 kmap(pg); 2654 } 2655 2656 /* Read 'ondisk_size' bytes from disk. */ 2657 down_read(&ni->file.run_lock); 2658 err = ntfs_bio_pages(sbi, run, pages_disk, npages_disk, vbo_disk, 2659 ondisk_size, REQ_OP_READ); 2660 up_read(&ni->file.run_lock); 2661 if (err) 2662 goto out3; 2663 2664 /* 2665 * To simplify decompress algorithm do vmap for source and target pages. 2666 */ 2667 frame_ondisk = vmap(pages_disk, npages_disk, VM_MAP, PAGE_KERNEL_RO); 2668 if (!frame_ondisk) { 2669 err = -ENOMEM; 2670 goto out3; 2671 } 2672 2673 /* Decompress: Frame_ondisk -> frame_mem. */ 2674 #ifdef CONFIG_NTFS3_LZX_XPRESS 2675 if (run != &ni->file.run) { 2676 /* LZX or XPRESS */ 2677 err = decompress_lzx_xpress( 2678 sbi, frame_ondisk + (vbo_disk & (PAGE_SIZE - 1)), 2679 ondisk_size, frame_mem, unc_size, frame_size); 2680 } else 2681 #endif 2682 { 2683 /* LZNT - Native NTFS compression. */ 2684 unc_size = decompress_lznt(frame_ondisk, ondisk_size, frame_mem, 2685 frame_size); 2686 if ((ssize_t)unc_size < 0) 2687 err = unc_size; 2688 else if (!unc_size || unc_size > frame_size) 2689 err = -EINVAL; 2690 } 2691 if (!err && valid_size < frame_vbo + frame_size) { 2692 size_t ok = valid_size - frame_vbo; 2693 2694 memset(frame_mem + ok, 0, frame_size - ok); 2695 } 2696 2697 vunmap(frame_ondisk); 2698 2699 out3: 2700 for (i = 0; i < npages_disk; i++) { 2701 pg = pages_disk[i]; 2702 if (pg) { 2703 kunmap(pg); 2704 unlock_page(pg); 2705 put_page(pg); 2706 } 2707 } 2708 kfree(pages_disk); 2709 2710 out2: 2711 #ifdef CONFIG_NTFS3_LZX_XPRESS 2712 if (run != &ni->file.run) 2713 run_free(run); 2714 #endif 2715 out1: 2716 vunmap(frame_mem); 2717 out: 2718 for (i = 0; i < pages_per_frame; i++) { 2719 pg = pages[i]; 2720 kunmap(pg); 2721 ClearPageError(pg); 2722 SetPageUptodate(pg); 2723 } 2724 2725 return err; 2726 } 2727 2728 /* 2729 * ni_write_frame 2730 * 2731 * Pages - Array of locked pages. 2732 */ 2733 int ni_write_frame(struct ntfs_inode *ni, struct page **pages, 2734 u32 pages_per_frame) 2735 { 2736 int err; 2737 struct ntfs_sb_info *sbi = ni->mi.sbi; 2738 u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits; 2739 u32 frame_size = sbi->cluster_size << NTFS_LZNT_CUNIT; 2740 u64 frame_vbo = (u64)pages[0]->index << PAGE_SHIFT; 2741 CLST frame = frame_vbo >> frame_bits; 2742 char *frame_ondisk = NULL; 2743 struct page **pages_disk = NULL; 2744 struct ATTR_LIST_ENTRY *le = NULL; 2745 char *frame_mem; 2746 struct ATTRIB *attr; 2747 struct mft_inode *mi; 2748 u32 i; 2749 struct page *pg; 2750 size_t compr_size, ondisk_size; 2751 struct lznt *lznt; 2752 2753 attr = ni_find_attr(ni, NULL, &le, ATTR_DATA, NULL, 0, NULL, &mi); 2754 if (!attr) { 2755 err = -ENOENT; 2756 goto out; 2757 } 2758 2759 if (WARN_ON(!is_attr_compressed(attr))) { 2760 err = -EINVAL; 2761 goto out; 2762 } 2763 2764 if (sbi->cluster_size > NTFS_LZNT_MAX_CLUSTER) { 2765 err = -EOPNOTSUPP; 2766 goto out; 2767 } 2768 2769 if (!attr->non_res) { 2770 down_write(&ni->file.run_lock); 2771 err = attr_make_nonresident(ni, attr, le, mi, 2772 le32_to_cpu(attr->res.data_size), 2773 &ni->file.run, &attr, pages[0]); 2774 up_write(&ni->file.run_lock); 2775 if (err) 2776 goto out; 2777 } 2778 2779 if (attr->nres.c_unit != NTFS_LZNT_CUNIT) { 2780 err = -EOPNOTSUPP; 2781 goto out; 2782 } 2783 2784 pages_disk = kcalloc(pages_per_frame, sizeof(struct page *), GFP_NOFS); 2785 if (!pages_disk) { 2786 err = -ENOMEM; 2787 goto out; 2788 } 2789 2790 for (i = 0; i < pages_per_frame; i++) { 2791 pg = alloc_page(GFP_KERNEL); 2792 if (!pg) { 2793 err = -ENOMEM; 2794 goto out1; 2795 } 2796 pages_disk[i] = pg; 2797 lock_page(pg); 2798 kmap(pg); 2799 } 2800 2801 /* To simplify compress algorithm do vmap for source and target pages. */ 2802 frame_ondisk = vmap(pages_disk, pages_per_frame, VM_MAP, PAGE_KERNEL); 2803 if (!frame_ondisk) { 2804 err = -ENOMEM; 2805 goto out1; 2806 } 2807 2808 for (i = 0; i < pages_per_frame; i++) 2809 kmap(pages[i]); 2810 2811 /* Map in-memory frame for read-only. */ 2812 frame_mem = vmap(pages, pages_per_frame, VM_MAP, PAGE_KERNEL_RO); 2813 if (!frame_mem) { 2814 err = -ENOMEM; 2815 goto out2; 2816 } 2817 2818 mutex_lock(&sbi->compress.mtx_lznt); 2819 lznt = NULL; 2820 if (!sbi->compress.lznt) { 2821 /* 2822 * LZNT implements two levels of compression: 2823 * 0 - Standard compression 2824 * 1 - Best compression, requires a lot of cpu 2825 * use mount option? 2826 */ 2827 lznt = get_lznt_ctx(0); 2828 if (!lznt) { 2829 mutex_unlock(&sbi->compress.mtx_lznt); 2830 err = -ENOMEM; 2831 goto out3; 2832 } 2833 2834 sbi->compress.lznt = lznt; 2835 lznt = NULL; 2836 } 2837 2838 /* Compress: frame_mem -> frame_ondisk */ 2839 compr_size = compress_lznt(frame_mem, frame_size, frame_ondisk, 2840 frame_size, sbi->compress.lznt); 2841 mutex_unlock(&sbi->compress.mtx_lznt); 2842 kfree(lznt); 2843 2844 if (compr_size + sbi->cluster_size > frame_size) { 2845 /* Frame is not compressed. */ 2846 compr_size = frame_size; 2847 ondisk_size = frame_size; 2848 } else if (compr_size) { 2849 /* Frame is compressed. */ 2850 ondisk_size = ntfs_up_cluster(sbi, compr_size); 2851 memset(frame_ondisk + compr_size, 0, ondisk_size - compr_size); 2852 } else { 2853 /* Frame is sparsed. */ 2854 ondisk_size = 0; 2855 } 2856 2857 down_write(&ni->file.run_lock); 2858 run_truncate_around(&ni->file.run, le64_to_cpu(attr->nres.svcn)); 2859 err = attr_allocate_frame(ni, frame, compr_size, ni->i_valid); 2860 up_write(&ni->file.run_lock); 2861 if (err) 2862 goto out2; 2863 2864 if (!ondisk_size) 2865 goto out2; 2866 2867 down_read(&ni->file.run_lock); 2868 err = ntfs_bio_pages(sbi, &ni->file.run, 2869 ondisk_size < frame_size ? pages_disk : pages, 2870 pages_per_frame, frame_vbo, ondisk_size, 2871 REQ_OP_WRITE); 2872 up_read(&ni->file.run_lock); 2873 2874 out3: 2875 vunmap(frame_mem); 2876 2877 out2: 2878 for (i = 0; i < pages_per_frame; i++) 2879 kunmap(pages[i]); 2880 2881 vunmap(frame_ondisk); 2882 out1: 2883 for (i = 0; i < pages_per_frame; i++) { 2884 pg = pages_disk[i]; 2885 if (pg) { 2886 kunmap(pg); 2887 unlock_page(pg); 2888 put_page(pg); 2889 } 2890 } 2891 kfree(pages_disk); 2892 out: 2893 return err; 2894 } 2895 2896 /* 2897 * ni_remove_name - Removes name 'de' from MFT and from directory. 2898 * 'de2' and 'undo_step' are used to restore MFT/dir, if error occurs. 2899 */ 2900 int ni_remove_name(struct ntfs_inode *dir_ni, struct ntfs_inode *ni, 2901 struct NTFS_DE *de, struct NTFS_DE **de2, int *undo_step) 2902 { 2903 int err; 2904 struct ntfs_sb_info *sbi = ni->mi.sbi; 2905 struct ATTR_FILE_NAME *de_name = (struct ATTR_FILE_NAME *)(de + 1); 2906 struct ATTR_FILE_NAME *fname; 2907 struct ATTR_LIST_ENTRY *le; 2908 struct mft_inode *mi; 2909 u16 de_key_size = le16_to_cpu(de->key_size); 2910 u8 name_type; 2911 2912 *undo_step = 0; 2913 2914 /* Find name in record. */ 2915 mi_get_ref(&dir_ni->mi, &de_name->home); 2916 2917 fname = ni_fname_name(ni, (struct le_str *)&de_name->name_len, 2918 &de_name->home, &mi, &le); 2919 if (!fname) 2920 return -ENOENT; 2921 2922 memcpy(&de_name->dup, &fname->dup, sizeof(struct NTFS_DUP_INFO)); 2923 name_type = paired_name(fname->type); 2924 2925 /* Mark ntfs as dirty. It will be cleared at umount. */ 2926 ntfs_set_state(sbi, NTFS_DIRTY_DIRTY); 2927 2928 /* Step 1: Remove name from directory. */ 2929 err = indx_delete_entry(&dir_ni->dir, dir_ni, fname, de_key_size, sbi); 2930 if (err) 2931 return err; 2932 2933 /* Step 2: Remove name from MFT. */ 2934 ni_remove_attr_le(ni, attr_from_name(fname), mi, le); 2935 2936 *undo_step = 2; 2937 2938 /* Get paired name. */ 2939 fname = ni_fname_type(ni, name_type, &mi, &le); 2940 if (fname) { 2941 u16 de2_key_size = fname_full_size(fname); 2942 2943 *de2 = Add2Ptr(de, 1024); 2944 (*de2)->key_size = cpu_to_le16(de2_key_size); 2945 2946 memcpy(*de2 + 1, fname, de2_key_size); 2947 2948 /* Step 3: Remove paired name from directory. */ 2949 err = indx_delete_entry(&dir_ni->dir, dir_ni, fname, 2950 de2_key_size, sbi); 2951 if (err) 2952 return err; 2953 2954 /* Step 4: Remove paired name from MFT. */ 2955 ni_remove_attr_le(ni, attr_from_name(fname), mi, le); 2956 2957 *undo_step = 4; 2958 } 2959 return 0; 2960 } 2961 2962 /* 2963 * ni_remove_name_undo - Paired function for ni_remove_name. 2964 * 2965 * Return: True if ok 2966 */ 2967 bool ni_remove_name_undo(struct ntfs_inode *dir_ni, struct ntfs_inode *ni, 2968 struct NTFS_DE *de, struct NTFS_DE *de2, int undo_step) 2969 { 2970 struct ntfs_sb_info *sbi = ni->mi.sbi; 2971 struct ATTRIB *attr; 2972 u16 de_key_size; 2973 2974 switch (undo_step) { 2975 case 4: 2976 de_key_size = le16_to_cpu(de2->key_size); 2977 if (ni_insert_resident(ni, de_key_size, ATTR_NAME, NULL, 0, 2978 &attr, NULL, NULL)) 2979 return false; 2980 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), de2 + 1, de_key_size); 2981 2982 mi_get_ref(&ni->mi, &de2->ref); 2983 de2->size = cpu_to_le16(ALIGN(de_key_size, 8) + 2984 sizeof(struct NTFS_DE)); 2985 de2->flags = 0; 2986 de2->res = 0; 2987 2988 if (indx_insert_entry(&dir_ni->dir, dir_ni, de2, sbi, NULL, 1)) 2989 return false; 2990 fallthrough; 2991 2992 case 2: 2993 de_key_size = le16_to_cpu(de->key_size); 2994 2995 if (ni_insert_resident(ni, de_key_size, ATTR_NAME, NULL, 0, 2996 &attr, NULL, NULL)) 2997 return false; 2998 2999 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), de + 1, de_key_size); 3000 mi_get_ref(&ni->mi, &de->ref); 3001 3002 if (indx_insert_entry(&dir_ni->dir, dir_ni, de, sbi, NULL, 1)) 3003 return false; 3004 } 3005 3006 return true; 3007 } 3008 3009 /* 3010 * ni_add_name - Add new name into MFT and into directory. 3011 */ 3012 int ni_add_name(struct ntfs_inode *dir_ni, struct ntfs_inode *ni, 3013 struct NTFS_DE *de) 3014 { 3015 int err; 3016 struct ntfs_sb_info *sbi = ni->mi.sbi; 3017 struct ATTRIB *attr; 3018 struct ATTR_LIST_ENTRY *le; 3019 struct mft_inode *mi; 3020 struct ATTR_FILE_NAME *fname; 3021 struct ATTR_FILE_NAME *de_name = (struct ATTR_FILE_NAME *)(de + 1); 3022 u16 de_key_size = le16_to_cpu(de->key_size); 3023 3024 if (sbi->options->windows_names && 3025 !valid_windows_name(sbi, (struct le_str *)&de_name->name_len)) 3026 return -EINVAL; 3027 3028 /* If option "hide_dot_files" then set hidden attribute for dot files. */ 3029 if (ni->mi.sbi->options->hide_dot_files) { 3030 if (de_name->name_len > 0 && 3031 le16_to_cpu(de_name->name[0]) == '.') 3032 ni->std_fa |= FILE_ATTRIBUTE_HIDDEN; 3033 else 3034 ni->std_fa &= ~FILE_ATTRIBUTE_HIDDEN; 3035 } 3036 3037 mi_get_ref(&ni->mi, &de->ref); 3038 mi_get_ref(&dir_ni->mi, &de_name->home); 3039 3040 /* Fill duplicate from any ATTR_NAME. */ 3041 fname = ni_fname_name(ni, NULL, NULL, NULL, NULL); 3042 if (fname) 3043 memcpy(&de_name->dup, &fname->dup, sizeof(fname->dup)); 3044 de_name->dup.fa = ni->std_fa; 3045 3046 /* Insert new name into MFT. */ 3047 err = ni_insert_resident(ni, de_key_size, ATTR_NAME, NULL, 0, &attr, 3048 &mi, &le); 3049 if (err) 3050 return err; 3051 3052 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), de_name, de_key_size); 3053 3054 /* Insert new name into directory. */ 3055 err = indx_insert_entry(&dir_ni->dir, dir_ni, de, sbi, NULL, 0); 3056 if (err) 3057 ni_remove_attr_le(ni, attr, mi, le); 3058 3059 return err; 3060 } 3061 3062 /* 3063 * ni_rename - Remove one name and insert new name. 3064 */ 3065 int ni_rename(struct ntfs_inode *dir_ni, struct ntfs_inode *new_dir_ni, 3066 struct ntfs_inode *ni, struct NTFS_DE *de, struct NTFS_DE *new_de, 3067 bool *is_bad) 3068 { 3069 int err; 3070 struct NTFS_DE *de2 = NULL; 3071 int undo = 0; 3072 3073 /* 3074 * There are two possible ways to rename: 3075 * 1) Add new name and remove old name. 3076 * 2) Remove old name and add new name. 3077 * 3078 * In most cases (not all!) adding new name into MFT and into directory can 3079 * allocate additional cluster(s). 3080 * Second way may result to bad inode if we can't add new name 3081 * and then can't restore (add) old name. 3082 */ 3083 3084 /* 3085 * Way 1 - Add new + remove old. 3086 */ 3087 err = ni_add_name(new_dir_ni, ni, new_de); 3088 if (!err) { 3089 err = ni_remove_name(dir_ni, ni, de, &de2, &undo); 3090 if (err && ni_remove_name(new_dir_ni, ni, new_de, &de2, &undo)) 3091 *is_bad = true; 3092 } 3093 3094 /* 3095 * Way 2 - Remove old + add new. 3096 */ 3097 /* 3098 * err = ni_remove_name(dir_ni, ni, de, &de2, &undo); 3099 * if (!err) { 3100 * err = ni_add_name(new_dir_ni, ni, new_de); 3101 * if (err && !ni_remove_name_undo(dir_ni, ni, de, de2, undo)) 3102 * *is_bad = true; 3103 * } 3104 */ 3105 3106 return err; 3107 } 3108 3109 /* 3110 * ni_is_dirty - Return: True if 'ni' requires ni_write_inode. 3111 */ 3112 bool ni_is_dirty(struct inode *inode) 3113 { 3114 struct ntfs_inode *ni = ntfs_i(inode); 3115 struct rb_node *node; 3116 3117 if (ni->mi.dirty || ni->attr_list.dirty || 3118 (ni->ni_flags & NI_FLAG_UPDATE_PARENT)) 3119 return true; 3120 3121 for (node = rb_first(&ni->mi_tree); node; node = rb_next(node)) { 3122 if (rb_entry(node, struct mft_inode, node)->dirty) 3123 return true; 3124 } 3125 3126 return false; 3127 } 3128 3129 /* 3130 * ni_update_parent 3131 * 3132 * Update duplicate info of ATTR_FILE_NAME in MFT and in parent directories. 3133 */ 3134 static bool ni_update_parent(struct ntfs_inode *ni, struct NTFS_DUP_INFO *dup, 3135 int sync) 3136 { 3137 struct ATTRIB *attr; 3138 struct mft_inode *mi; 3139 struct ATTR_LIST_ENTRY *le = NULL; 3140 struct ntfs_sb_info *sbi = ni->mi.sbi; 3141 struct super_block *sb = sbi->sb; 3142 bool re_dirty = false; 3143 3144 if (ni->mi.mrec->flags & RECORD_FLAG_DIR) { 3145 dup->fa |= FILE_ATTRIBUTE_DIRECTORY; 3146 attr = NULL; 3147 dup->alloc_size = 0; 3148 dup->data_size = 0; 3149 } else { 3150 dup->fa &= ~FILE_ATTRIBUTE_DIRECTORY; 3151 3152 attr = ni_find_attr(ni, NULL, &le, ATTR_DATA, NULL, 0, NULL, 3153 &mi); 3154 if (!attr) { 3155 dup->alloc_size = dup->data_size = 0; 3156 } else if (!attr->non_res) { 3157 u32 data_size = le32_to_cpu(attr->res.data_size); 3158 3159 dup->alloc_size = cpu_to_le64(ALIGN(data_size, 8)); 3160 dup->data_size = cpu_to_le64(data_size); 3161 } else { 3162 u64 new_valid = ni->i_valid; 3163 u64 data_size = le64_to_cpu(attr->nres.data_size); 3164 __le64 valid_le; 3165 3166 dup->alloc_size = is_attr_ext(attr) ? 3167 attr->nres.total_size : 3168 attr->nres.alloc_size; 3169 dup->data_size = attr->nres.data_size; 3170 3171 if (new_valid > data_size) 3172 new_valid = data_size; 3173 3174 valid_le = cpu_to_le64(new_valid); 3175 if (valid_le != attr->nres.valid_size) { 3176 attr->nres.valid_size = valid_le; 3177 mi->dirty = true; 3178 } 3179 } 3180 } 3181 3182 /* TODO: Fill reparse info. */ 3183 dup->reparse = 0; 3184 dup->ea_size = 0; 3185 3186 if (ni->ni_flags & NI_FLAG_EA) { 3187 attr = ni_find_attr(ni, attr, &le, ATTR_EA_INFO, NULL, 0, NULL, 3188 NULL); 3189 if (attr) { 3190 const struct EA_INFO *info; 3191 3192 info = resident_data_ex(attr, sizeof(struct EA_INFO)); 3193 /* If ATTR_EA_INFO exists 'info' can't be NULL. */ 3194 if (info) 3195 dup->ea_size = info->size_pack; 3196 } 3197 } 3198 3199 attr = NULL; 3200 le = NULL; 3201 3202 while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL, 3203 &mi))) { 3204 struct inode *dir; 3205 struct ATTR_FILE_NAME *fname; 3206 3207 fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 3208 if (!fname || !memcmp(&fname->dup, dup, sizeof(fname->dup))) 3209 continue; 3210 3211 /* ntfs_iget5 may sleep. */ 3212 dir = ntfs_iget5(sb, &fname->home, NULL); 3213 if (IS_ERR(dir)) { 3214 ntfs_inode_warn( 3215 &ni->vfs_inode, 3216 "failed to open parent directory r=%lx to update", 3217 (long)ino_get(&fname->home)); 3218 continue; 3219 } 3220 3221 if (!is_bad_inode(dir)) { 3222 struct ntfs_inode *dir_ni = ntfs_i(dir); 3223 3224 if (!ni_trylock(dir_ni)) { 3225 re_dirty = true; 3226 } else { 3227 indx_update_dup(dir_ni, sbi, fname, dup, sync); 3228 ni_unlock(dir_ni); 3229 memcpy(&fname->dup, dup, sizeof(fname->dup)); 3230 mi->dirty = true; 3231 } 3232 } 3233 iput(dir); 3234 } 3235 3236 return re_dirty; 3237 } 3238 3239 /* 3240 * ni_write_inode - Write MFT base record and all subrecords to disk. 3241 */ 3242 int ni_write_inode(struct inode *inode, int sync, const char *hint) 3243 { 3244 int err = 0, err2; 3245 struct ntfs_inode *ni = ntfs_i(inode); 3246 struct super_block *sb = inode->i_sb; 3247 struct ntfs_sb_info *sbi = sb->s_fs_info; 3248 bool re_dirty = false; 3249 struct ATTR_STD_INFO *std; 3250 struct rb_node *node, *next; 3251 struct NTFS_DUP_INFO dup; 3252 3253 if (is_bad_inode(inode) || sb_rdonly(sb)) 3254 return 0; 3255 3256 if (!ni_trylock(ni)) { 3257 /* 'ni' is under modification, skip for now. */ 3258 mark_inode_dirty_sync(inode); 3259 return 0; 3260 } 3261 3262 if (!ni->mi.mrec) 3263 goto out; 3264 3265 if (is_rec_inuse(ni->mi.mrec) && 3266 !(sbi->flags & NTFS_FLAGS_LOG_REPLAYING) && inode->i_nlink) { 3267 bool modified = false; 3268 3269 /* Update times in standard attribute. */ 3270 std = ni_std(ni); 3271 if (!std) { 3272 err = -EINVAL; 3273 goto out; 3274 } 3275 3276 /* Update the access times if they have changed. */ 3277 dup.m_time = kernel2nt(&inode->i_mtime); 3278 if (std->m_time != dup.m_time) { 3279 std->m_time = dup.m_time; 3280 modified = true; 3281 } 3282 3283 dup.c_time = kernel2nt(&inode->i_ctime); 3284 if (std->c_time != dup.c_time) { 3285 std->c_time = dup.c_time; 3286 modified = true; 3287 } 3288 3289 dup.a_time = kernel2nt(&inode->i_atime); 3290 if (std->a_time != dup.a_time) { 3291 std->a_time = dup.a_time; 3292 modified = true; 3293 } 3294 3295 dup.fa = ni->std_fa; 3296 if (std->fa != dup.fa) { 3297 std->fa = dup.fa; 3298 modified = true; 3299 } 3300 3301 /* std attribute is always in primary MFT record. */ 3302 if (modified) 3303 ni->mi.dirty = true; 3304 3305 if (!ntfs_is_meta_file(sbi, inode->i_ino) && 3306 (modified || (ni->ni_flags & NI_FLAG_UPDATE_PARENT)) 3307 /* Avoid __wait_on_freeing_inode(inode). */ 3308 && (sb->s_flags & SB_ACTIVE)) { 3309 dup.cr_time = std->cr_time; 3310 /* Not critical if this function fail. */ 3311 re_dirty = ni_update_parent(ni, &dup, sync); 3312 3313 if (re_dirty) 3314 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 3315 else 3316 ni->ni_flags &= ~NI_FLAG_UPDATE_PARENT; 3317 } 3318 3319 /* Update attribute list. */ 3320 if (ni->attr_list.size && ni->attr_list.dirty) { 3321 if (inode->i_ino != MFT_REC_MFT || sync) { 3322 err = ni_try_remove_attr_list(ni); 3323 if (err) 3324 goto out; 3325 } 3326 3327 err = al_update(ni, sync); 3328 if (err) 3329 goto out; 3330 } 3331 } 3332 3333 for (node = rb_first(&ni->mi_tree); node; node = next) { 3334 struct mft_inode *mi = rb_entry(node, struct mft_inode, node); 3335 bool is_empty; 3336 3337 next = rb_next(node); 3338 3339 if (!mi->dirty) 3340 continue; 3341 3342 is_empty = !mi_enum_attr(mi, NULL); 3343 3344 if (is_empty) 3345 clear_rec_inuse(mi->mrec); 3346 3347 err2 = mi_write(mi, sync); 3348 if (!err && err2) 3349 err = err2; 3350 3351 if (is_empty) { 3352 ntfs_mark_rec_free(sbi, mi->rno, false); 3353 rb_erase(node, &ni->mi_tree); 3354 mi_put(mi); 3355 } 3356 } 3357 3358 if (ni->mi.dirty) { 3359 err2 = mi_write(&ni->mi, sync); 3360 if (!err && err2) 3361 err = err2; 3362 } 3363 out: 3364 ni_unlock(ni); 3365 3366 if (err) { 3367 ntfs_inode_err(inode, "%s failed, %d.", hint, err); 3368 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 3369 return err; 3370 } 3371 3372 if (re_dirty) 3373 mark_inode_dirty_sync(inode); 3374 3375 return 0; 3376 } 3377