1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 * TODO: Merge attr_set_size/attr_data_get_block/attr_allocate_frame? 7 */ 8 9 #include <linux/fs.h> 10 #include <linux/slab.h> 11 #include <linux/kernel.h> 12 13 #include "debug.h" 14 #include "ntfs.h" 15 #include "ntfs_fs.h" 16 17 /* 18 * You can set external NTFS_MIN_LOG2_OF_CLUMP/NTFS_MAX_LOG2_OF_CLUMP to manage 19 * preallocate algorithm. 20 */ 21 #ifndef NTFS_MIN_LOG2_OF_CLUMP 22 #define NTFS_MIN_LOG2_OF_CLUMP 16 23 #endif 24 25 #ifndef NTFS_MAX_LOG2_OF_CLUMP 26 #define NTFS_MAX_LOG2_OF_CLUMP 26 27 #endif 28 29 // 16M 30 #define NTFS_CLUMP_MIN (1 << (NTFS_MIN_LOG2_OF_CLUMP + 8)) 31 // 16G 32 #define NTFS_CLUMP_MAX (1ull << (NTFS_MAX_LOG2_OF_CLUMP + 8)) 33 34 static inline u64 get_pre_allocated(u64 size) 35 { 36 u32 clump; 37 u8 align_shift; 38 u64 ret; 39 40 if (size <= NTFS_CLUMP_MIN) { 41 clump = 1 << NTFS_MIN_LOG2_OF_CLUMP; 42 align_shift = NTFS_MIN_LOG2_OF_CLUMP; 43 } else if (size >= NTFS_CLUMP_MAX) { 44 clump = 1 << NTFS_MAX_LOG2_OF_CLUMP; 45 align_shift = NTFS_MAX_LOG2_OF_CLUMP; 46 } else { 47 align_shift = NTFS_MIN_LOG2_OF_CLUMP - 1 + 48 __ffs(size >> (8 + NTFS_MIN_LOG2_OF_CLUMP)); 49 clump = 1u << align_shift; 50 } 51 52 ret = (((size + clump - 1) >> align_shift)) << align_shift; 53 54 return ret; 55 } 56 57 /* 58 * attr_load_runs - Load all runs stored in @attr. 59 */ 60 static int attr_load_runs(struct ATTRIB *attr, struct ntfs_inode *ni, 61 struct runs_tree *run, const CLST *vcn) 62 { 63 int err; 64 CLST svcn = le64_to_cpu(attr->nres.svcn); 65 CLST evcn = le64_to_cpu(attr->nres.evcn); 66 u32 asize; 67 u16 run_off; 68 69 if (svcn >= evcn + 1 || run_is_mapped_full(run, svcn, evcn)) 70 return 0; 71 72 if (vcn && (evcn < *vcn || *vcn < svcn)) 73 return -EINVAL; 74 75 asize = le32_to_cpu(attr->size); 76 run_off = le16_to_cpu(attr->nres.run_off); 77 78 if (run_off > asize) 79 return -EINVAL; 80 81 err = run_unpack_ex(run, ni->mi.sbi, ni->mi.rno, svcn, evcn, 82 vcn ? *vcn : svcn, Add2Ptr(attr, run_off), 83 asize - run_off); 84 if (err < 0) 85 return err; 86 87 return 0; 88 } 89 90 /* 91 * run_deallocate_ex - Deallocate clusters. 92 */ 93 static int run_deallocate_ex(struct ntfs_sb_info *sbi, struct runs_tree *run, 94 CLST vcn, CLST len, CLST *done, bool trim) 95 { 96 int err = 0; 97 CLST vcn_next, vcn0 = vcn, lcn, clen, dn = 0; 98 size_t idx; 99 100 if (!len) 101 goto out; 102 103 if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) { 104 failed: 105 run_truncate(run, vcn0); 106 err = -EINVAL; 107 goto out; 108 } 109 110 for (;;) { 111 if (clen > len) 112 clen = len; 113 114 if (!clen) { 115 err = -EINVAL; 116 goto out; 117 } 118 119 if (lcn != SPARSE_LCN) { 120 if (sbi) { 121 /* mark bitmap range [lcn + clen) as free and trim clusters. */ 122 mark_as_free_ex(sbi, lcn, clen, trim); 123 } 124 dn += clen; 125 } 126 127 len -= clen; 128 if (!len) 129 break; 130 131 vcn_next = vcn + clen; 132 if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) || 133 vcn != vcn_next) { 134 /* Save memory - don't load entire run. */ 135 goto failed; 136 } 137 } 138 139 out: 140 if (done) 141 *done += dn; 142 143 return err; 144 } 145 146 /* 147 * attr_allocate_clusters - Find free space, mark it as used and store in @run. 148 */ 149 int attr_allocate_clusters(struct ntfs_sb_info *sbi, struct runs_tree *run, 150 CLST vcn, CLST lcn, CLST len, CLST *pre_alloc, 151 enum ALLOCATE_OPT opt, CLST *alen, const size_t fr, 152 CLST *new_lcn, CLST *new_len) 153 { 154 int err; 155 CLST flen, vcn0 = vcn, pre = pre_alloc ? *pre_alloc : 0; 156 size_t cnt = run->count; 157 158 for (;;) { 159 err = ntfs_look_for_free_space(sbi, lcn, len + pre, &lcn, &flen, 160 opt); 161 162 if (err == -ENOSPC && pre) { 163 pre = 0; 164 if (*pre_alloc) 165 *pre_alloc = 0; 166 continue; 167 } 168 169 if (err) 170 goto out; 171 172 if (vcn == vcn0) { 173 /* Return the first fragment. */ 174 if (new_lcn) 175 *new_lcn = lcn; 176 if (new_len) 177 *new_len = flen; 178 } 179 180 /* Add new fragment into run storage. */ 181 if (!run_add_entry(run, vcn, lcn, flen, opt & ALLOCATE_MFT)) { 182 /* Undo last 'ntfs_look_for_free_space' */ 183 mark_as_free_ex(sbi, lcn, len, false); 184 err = -ENOMEM; 185 goto out; 186 } 187 188 if (opt & ALLOCATE_ZERO) { 189 u8 shift = sbi->cluster_bits - SECTOR_SHIFT; 190 191 err = blkdev_issue_zeroout(sbi->sb->s_bdev, 192 (sector_t)lcn << shift, 193 (sector_t)flen << shift, 194 GFP_NOFS, 0); 195 if (err) 196 goto out; 197 } 198 199 vcn += flen; 200 201 if (flen >= len || (opt & ALLOCATE_MFT) || 202 (fr && run->count - cnt >= fr)) { 203 *alen = vcn - vcn0; 204 return 0; 205 } 206 207 len -= flen; 208 } 209 210 out: 211 /* Undo 'ntfs_look_for_free_space' */ 212 if (vcn - vcn0) { 213 run_deallocate_ex(sbi, run, vcn0, vcn - vcn0, NULL, false); 214 run_truncate(run, vcn0); 215 } 216 217 return err; 218 } 219 220 /* 221 * attr_make_nonresident 222 * 223 * If page is not NULL - it is already contains resident data 224 * and locked (called from ni_write_frame()). 225 */ 226 int attr_make_nonresident(struct ntfs_inode *ni, struct ATTRIB *attr, 227 struct ATTR_LIST_ENTRY *le, struct mft_inode *mi, 228 u64 new_size, struct runs_tree *run, 229 struct ATTRIB **ins_attr, struct page *page) 230 { 231 struct ntfs_sb_info *sbi; 232 struct ATTRIB *attr_s; 233 struct MFT_REC *rec; 234 u32 used, asize, rsize, aoff, align; 235 bool is_data; 236 CLST len, alen; 237 char *next; 238 int err; 239 240 if (attr->non_res) { 241 *ins_attr = attr; 242 return 0; 243 } 244 245 sbi = mi->sbi; 246 rec = mi->mrec; 247 attr_s = NULL; 248 used = le32_to_cpu(rec->used); 249 asize = le32_to_cpu(attr->size); 250 next = Add2Ptr(attr, asize); 251 aoff = PtrOffset(rec, attr); 252 rsize = le32_to_cpu(attr->res.data_size); 253 is_data = attr->type == ATTR_DATA && !attr->name_len; 254 255 align = sbi->cluster_size; 256 if (is_attr_compressed(attr)) 257 align <<= COMPRESSION_UNIT; 258 len = (rsize + align - 1) >> sbi->cluster_bits; 259 260 run_init(run); 261 262 /* Make a copy of original attribute. */ 263 attr_s = kmemdup(attr, asize, GFP_NOFS); 264 if (!attr_s) { 265 err = -ENOMEM; 266 goto out; 267 } 268 269 if (!len) { 270 /* Empty resident -> Empty nonresident. */ 271 alen = 0; 272 } else { 273 const char *data = resident_data(attr); 274 275 err = attr_allocate_clusters(sbi, run, 0, 0, len, NULL, 276 ALLOCATE_DEF, &alen, 0, NULL, 277 NULL); 278 if (err) 279 goto out1; 280 281 if (!rsize) { 282 /* Empty resident -> Non empty nonresident. */ 283 } else if (!is_data) { 284 err = ntfs_sb_write_run(sbi, run, 0, data, rsize, 0); 285 if (err) 286 goto out2; 287 } else if (!page) { 288 char *kaddr; 289 290 page = grab_cache_page(ni->vfs_inode.i_mapping, 0); 291 if (!page) { 292 err = -ENOMEM; 293 goto out2; 294 } 295 kaddr = kmap_atomic(page); 296 memcpy(kaddr, data, rsize); 297 memset(kaddr + rsize, 0, PAGE_SIZE - rsize); 298 kunmap_atomic(kaddr); 299 flush_dcache_page(page); 300 SetPageUptodate(page); 301 set_page_dirty(page); 302 unlock_page(page); 303 put_page(page); 304 } 305 } 306 307 /* Remove original attribute. */ 308 used -= asize; 309 memmove(attr, Add2Ptr(attr, asize), used - aoff); 310 rec->used = cpu_to_le32(used); 311 mi->dirty = true; 312 if (le) 313 al_remove_le(ni, le); 314 315 err = ni_insert_nonresident(ni, attr_s->type, attr_name(attr_s), 316 attr_s->name_len, run, 0, alen, 317 attr_s->flags, &attr, NULL, NULL); 318 if (err) 319 goto out3; 320 321 kfree(attr_s); 322 attr->nres.data_size = cpu_to_le64(rsize); 323 attr->nres.valid_size = attr->nres.data_size; 324 325 *ins_attr = attr; 326 327 if (is_data) 328 ni->ni_flags &= ~NI_FLAG_RESIDENT; 329 330 /* Resident attribute becomes non resident. */ 331 return 0; 332 333 out3: 334 attr = Add2Ptr(rec, aoff); 335 memmove(next, attr, used - aoff); 336 memcpy(attr, attr_s, asize); 337 rec->used = cpu_to_le32(used + asize); 338 mi->dirty = true; 339 out2: 340 /* Undo: do not trim new allocated clusters. */ 341 run_deallocate(sbi, run, false); 342 run_close(run); 343 out1: 344 kfree(attr_s); 345 out: 346 return err; 347 } 348 349 /* 350 * attr_set_size_res - Helper for attr_set_size(). 351 */ 352 static int attr_set_size_res(struct ntfs_inode *ni, struct ATTRIB *attr, 353 struct ATTR_LIST_ENTRY *le, struct mft_inode *mi, 354 u64 new_size, struct runs_tree *run, 355 struct ATTRIB **ins_attr) 356 { 357 struct ntfs_sb_info *sbi = mi->sbi; 358 struct MFT_REC *rec = mi->mrec; 359 u32 used = le32_to_cpu(rec->used); 360 u32 asize = le32_to_cpu(attr->size); 361 u32 aoff = PtrOffset(rec, attr); 362 u32 rsize = le32_to_cpu(attr->res.data_size); 363 u32 tail = used - aoff - asize; 364 char *next = Add2Ptr(attr, asize); 365 s64 dsize = ALIGN(new_size, 8) - ALIGN(rsize, 8); 366 367 if (dsize < 0) { 368 memmove(next + dsize, next, tail); 369 } else if (dsize > 0) { 370 if (used + dsize > sbi->max_bytes_per_attr) 371 return attr_make_nonresident(ni, attr, le, mi, new_size, 372 run, ins_attr, NULL); 373 374 memmove(next + dsize, next, tail); 375 memset(next, 0, dsize); 376 } 377 378 if (new_size > rsize) 379 memset(Add2Ptr(resident_data(attr), rsize), 0, 380 new_size - rsize); 381 382 rec->used = cpu_to_le32(used + dsize); 383 attr->size = cpu_to_le32(asize + dsize); 384 attr->res.data_size = cpu_to_le32(new_size); 385 mi->dirty = true; 386 *ins_attr = attr; 387 388 return 0; 389 } 390 391 /* 392 * attr_set_size - Change the size of attribute. 393 * 394 * Extend: 395 * - Sparse/compressed: No allocated clusters. 396 * - Normal: Append allocated and preallocated new clusters. 397 * Shrink: 398 * - No deallocate if @keep_prealloc is set. 399 */ 400 int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type, 401 const __le16 *name, u8 name_len, struct runs_tree *run, 402 u64 new_size, const u64 *new_valid, bool keep_prealloc, 403 struct ATTRIB **ret) 404 { 405 int err = 0; 406 struct ntfs_sb_info *sbi = ni->mi.sbi; 407 u8 cluster_bits = sbi->cluster_bits; 408 bool is_mft = ni->mi.rno == MFT_REC_MFT && type == ATTR_DATA && 409 !name_len; 410 u64 old_valid, old_size, old_alloc, new_alloc, new_alloc_tmp; 411 struct ATTRIB *attr = NULL, *attr_b; 412 struct ATTR_LIST_ENTRY *le, *le_b; 413 struct mft_inode *mi, *mi_b; 414 CLST alen, vcn, lcn, new_alen, old_alen, svcn, evcn; 415 CLST next_svcn, pre_alloc = -1, done = 0; 416 bool is_ext, is_bad = false; 417 bool dirty = false; 418 u32 align; 419 struct MFT_REC *rec; 420 421 again: 422 alen = 0; 423 le_b = NULL; 424 attr_b = ni_find_attr(ni, NULL, &le_b, type, name, name_len, NULL, 425 &mi_b); 426 if (!attr_b) { 427 err = -ENOENT; 428 goto bad_inode; 429 } 430 431 if (!attr_b->non_res) { 432 err = attr_set_size_res(ni, attr_b, le_b, mi_b, new_size, run, 433 &attr_b); 434 if (err) 435 return err; 436 437 /* Return if file is still resident. */ 438 if (!attr_b->non_res) { 439 dirty = true; 440 goto ok1; 441 } 442 443 /* Layout of records may be changed, so do a full search. */ 444 goto again; 445 } 446 447 is_ext = is_attr_ext(attr_b); 448 align = sbi->cluster_size; 449 if (is_ext) 450 align <<= attr_b->nres.c_unit; 451 452 old_valid = le64_to_cpu(attr_b->nres.valid_size); 453 old_size = le64_to_cpu(attr_b->nres.data_size); 454 old_alloc = le64_to_cpu(attr_b->nres.alloc_size); 455 456 again_1: 457 old_alen = old_alloc >> cluster_bits; 458 459 new_alloc = (new_size + align - 1) & ~(u64)(align - 1); 460 new_alen = new_alloc >> cluster_bits; 461 462 if (keep_prealloc && new_size < old_size) { 463 attr_b->nres.data_size = cpu_to_le64(new_size); 464 mi_b->dirty = dirty = true; 465 goto ok; 466 } 467 468 vcn = old_alen - 1; 469 470 svcn = le64_to_cpu(attr_b->nres.svcn); 471 evcn = le64_to_cpu(attr_b->nres.evcn); 472 473 if (svcn <= vcn && vcn <= evcn) { 474 attr = attr_b; 475 le = le_b; 476 mi = mi_b; 477 } else if (!le_b) { 478 err = -EINVAL; 479 goto bad_inode; 480 } else { 481 le = le_b; 482 attr = ni_find_attr(ni, attr_b, &le, type, name, name_len, &vcn, 483 &mi); 484 if (!attr) { 485 err = -EINVAL; 486 goto bad_inode; 487 } 488 489 next_le_1: 490 svcn = le64_to_cpu(attr->nres.svcn); 491 evcn = le64_to_cpu(attr->nres.evcn); 492 } 493 /* 494 * Here we have: 495 * attr,mi,le - last attribute segment (containing 'vcn'). 496 * attr_b,mi_b,le_b - base (primary) attribute segment. 497 */ 498 next_le: 499 rec = mi->mrec; 500 err = attr_load_runs(attr, ni, run, NULL); 501 if (err) 502 goto out; 503 504 if (new_size > old_size) { 505 CLST to_allocate; 506 size_t free; 507 508 if (new_alloc <= old_alloc) { 509 attr_b->nres.data_size = cpu_to_le64(new_size); 510 mi_b->dirty = dirty = true; 511 goto ok; 512 } 513 514 /* 515 * Add clusters. In simple case we have to: 516 * - allocate space (vcn, lcn, len) 517 * - update packed run in 'mi' 518 * - update attr->nres.evcn 519 * - update attr_b->nres.data_size/attr_b->nres.alloc_size 520 */ 521 to_allocate = new_alen - old_alen; 522 add_alloc_in_same_attr_seg: 523 lcn = 0; 524 if (is_mft) { 525 /* MFT allocates clusters from MFT zone. */ 526 pre_alloc = 0; 527 } else if (is_ext) { 528 /* No preallocate for sparse/compress. */ 529 pre_alloc = 0; 530 } else if (pre_alloc == -1) { 531 pre_alloc = 0; 532 if (type == ATTR_DATA && !name_len && 533 sbi->options->prealloc) { 534 pre_alloc = bytes_to_cluster( 535 sbi, get_pre_allocated( 536 new_size)) - 537 new_alen; 538 } 539 540 /* Get the last LCN to allocate from. */ 541 if (old_alen && 542 !run_lookup_entry(run, vcn, &lcn, NULL, NULL)) { 543 lcn = SPARSE_LCN; 544 } 545 546 if (lcn == SPARSE_LCN) 547 lcn = 0; 548 else if (lcn) 549 lcn += 1; 550 551 free = wnd_zeroes(&sbi->used.bitmap); 552 if (to_allocate > free) { 553 err = -ENOSPC; 554 goto out; 555 } 556 557 if (pre_alloc && to_allocate + pre_alloc > free) 558 pre_alloc = 0; 559 } 560 561 vcn = old_alen; 562 563 if (is_ext) { 564 if (!run_add_entry(run, vcn, SPARSE_LCN, to_allocate, 565 false)) { 566 err = -ENOMEM; 567 goto out; 568 } 569 alen = to_allocate; 570 } else { 571 /* ~3 bytes per fragment. */ 572 err = attr_allocate_clusters( 573 sbi, run, vcn, lcn, to_allocate, &pre_alloc, 574 is_mft ? ALLOCATE_MFT : ALLOCATE_DEF, &alen, 575 is_mft ? 0 : 576 (sbi->record_size - 577 le32_to_cpu(rec->used) + 8) / 578 3 + 579 1, 580 NULL, NULL); 581 if (err) 582 goto out; 583 } 584 585 done += alen; 586 vcn += alen; 587 if (to_allocate > alen) 588 to_allocate -= alen; 589 else 590 to_allocate = 0; 591 592 pack_runs: 593 err = mi_pack_runs(mi, attr, run, vcn - svcn); 594 if (err) 595 goto undo_1; 596 597 next_svcn = le64_to_cpu(attr->nres.evcn) + 1; 598 new_alloc_tmp = (u64)next_svcn << cluster_bits; 599 attr_b->nres.alloc_size = cpu_to_le64(new_alloc_tmp); 600 mi_b->dirty = dirty = true; 601 602 if (next_svcn >= vcn && !to_allocate) { 603 /* Normal way. Update attribute and exit. */ 604 attr_b->nres.data_size = cpu_to_le64(new_size); 605 goto ok; 606 } 607 608 /* At least two MFT to avoid recursive loop. */ 609 if (is_mft && next_svcn == vcn && 610 ((u64)done << sbi->cluster_bits) >= 2 * sbi->record_size) { 611 new_size = new_alloc_tmp; 612 attr_b->nres.data_size = attr_b->nres.alloc_size; 613 goto ok; 614 } 615 616 if (le32_to_cpu(rec->used) < sbi->record_size) { 617 old_alen = next_svcn; 618 evcn = old_alen - 1; 619 goto add_alloc_in_same_attr_seg; 620 } 621 622 attr_b->nres.data_size = attr_b->nres.alloc_size; 623 if (new_alloc_tmp < old_valid) 624 attr_b->nres.valid_size = attr_b->nres.data_size; 625 626 if (type == ATTR_LIST) { 627 err = ni_expand_list(ni); 628 if (err) 629 goto undo_2; 630 if (next_svcn < vcn) 631 goto pack_runs; 632 633 /* Layout of records is changed. */ 634 goto again; 635 } 636 637 if (!ni->attr_list.size) { 638 err = ni_create_attr_list(ni); 639 /* In case of error layout of records is not changed. */ 640 if (err) 641 goto undo_2; 642 /* Layout of records is changed. */ 643 } 644 645 if (next_svcn >= vcn) { 646 /* This is MFT data, repeat. */ 647 goto again; 648 } 649 650 /* Insert new attribute segment. */ 651 err = ni_insert_nonresident(ni, type, name, name_len, run, 652 next_svcn, vcn - next_svcn, 653 attr_b->flags, &attr, &mi, NULL); 654 655 /* 656 * Layout of records maybe changed. 657 * Find base attribute to update. 658 */ 659 le_b = NULL; 660 attr_b = ni_find_attr(ni, NULL, &le_b, type, name, name_len, 661 NULL, &mi_b); 662 if (!attr_b) { 663 err = -EINVAL; 664 goto bad_inode; 665 } 666 667 if (err) { 668 /* ni_insert_nonresident failed. */ 669 attr = NULL; 670 goto undo_2; 671 } 672 673 if (!is_mft) 674 run_truncate_head(run, evcn + 1); 675 676 svcn = le64_to_cpu(attr->nres.svcn); 677 evcn = le64_to_cpu(attr->nres.evcn); 678 679 /* 680 * Attribute is in consistency state. 681 * Save this point to restore to if next steps fail. 682 */ 683 old_valid = old_size = old_alloc = (u64)vcn << cluster_bits; 684 attr_b->nres.valid_size = attr_b->nres.data_size = 685 attr_b->nres.alloc_size = cpu_to_le64(old_size); 686 mi_b->dirty = dirty = true; 687 goto again_1; 688 } 689 690 if (new_size != old_size || 691 (new_alloc != old_alloc && !keep_prealloc)) { 692 /* 693 * Truncate clusters. In simple case we have to: 694 * - update packed run in 'mi' 695 * - update attr->nres.evcn 696 * - update attr_b->nres.data_size/attr_b->nres.alloc_size 697 * - mark and trim clusters as free (vcn, lcn, len) 698 */ 699 CLST dlen = 0; 700 701 vcn = max(svcn, new_alen); 702 new_alloc_tmp = (u64)vcn << cluster_bits; 703 704 if (vcn > svcn) { 705 err = mi_pack_runs(mi, attr, run, vcn - svcn); 706 if (err) 707 goto out; 708 } else if (le && le->vcn) { 709 u16 le_sz = le16_to_cpu(le->size); 710 711 /* 712 * NOTE: List entries for one attribute are always 713 * the same size. We deal with last entry (vcn==0) 714 * and it is not first in entries array 715 * (list entry for std attribute always first). 716 * So it is safe to step back. 717 */ 718 mi_remove_attr(NULL, mi, attr); 719 720 if (!al_remove_le(ni, le)) { 721 err = -EINVAL; 722 goto bad_inode; 723 } 724 725 le = (struct ATTR_LIST_ENTRY *)((u8 *)le - le_sz); 726 } else { 727 attr->nres.evcn = cpu_to_le64((u64)vcn - 1); 728 mi->dirty = true; 729 } 730 731 attr_b->nres.alloc_size = cpu_to_le64(new_alloc_tmp); 732 733 if (vcn == new_alen) { 734 attr_b->nres.data_size = cpu_to_le64(new_size); 735 if (new_size < old_valid) 736 attr_b->nres.valid_size = 737 attr_b->nres.data_size; 738 } else { 739 if (new_alloc_tmp <= 740 le64_to_cpu(attr_b->nres.data_size)) 741 attr_b->nres.data_size = 742 attr_b->nres.alloc_size; 743 if (new_alloc_tmp < 744 le64_to_cpu(attr_b->nres.valid_size)) 745 attr_b->nres.valid_size = 746 attr_b->nres.alloc_size; 747 } 748 mi_b->dirty = dirty = true; 749 750 err = run_deallocate_ex(sbi, run, vcn, evcn - vcn + 1, &dlen, 751 true); 752 if (err) 753 goto out; 754 755 if (is_ext) { 756 /* dlen - really deallocated clusters. */ 757 le64_sub_cpu(&attr_b->nres.total_size, 758 ((u64)dlen << cluster_bits)); 759 } 760 761 run_truncate(run, vcn); 762 763 if (new_alloc_tmp <= new_alloc) 764 goto ok; 765 766 old_size = new_alloc_tmp; 767 vcn = svcn - 1; 768 769 if (le == le_b) { 770 attr = attr_b; 771 mi = mi_b; 772 evcn = svcn - 1; 773 svcn = 0; 774 goto next_le; 775 } 776 777 if (le->type != type || le->name_len != name_len || 778 memcmp(le_name(le), name, name_len * sizeof(short))) { 779 err = -EINVAL; 780 goto bad_inode; 781 } 782 783 err = ni_load_mi(ni, le, &mi); 784 if (err) 785 goto out; 786 787 attr = mi_find_attr(mi, NULL, type, name, name_len, &le->id); 788 if (!attr) { 789 err = -EINVAL; 790 goto bad_inode; 791 } 792 goto next_le_1; 793 } 794 795 ok: 796 if (new_valid) { 797 __le64 valid = cpu_to_le64(min(*new_valid, new_size)); 798 799 if (attr_b->nres.valid_size != valid) { 800 attr_b->nres.valid_size = valid; 801 mi_b->dirty = true; 802 } 803 } 804 805 ok1: 806 if (ret) 807 *ret = attr_b; 808 809 if (((type == ATTR_DATA && !name_len) || 810 (type == ATTR_ALLOC && name == I30_NAME))) { 811 /* Update inode_set_bytes. */ 812 if (attr_b->non_res) { 813 new_alloc = le64_to_cpu(attr_b->nres.alloc_size); 814 if (inode_get_bytes(&ni->vfs_inode) != new_alloc) { 815 inode_set_bytes(&ni->vfs_inode, new_alloc); 816 dirty = true; 817 } 818 } 819 820 /* Don't forget to update duplicate information in parent. */ 821 if (dirty) { 822 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 823 mark_inode_dirty(&ni->vfs_inode); 824 } 825 } 826 827 return 0; 828 829 undo_2: 830 vcn -= alen; 831 attr_b->nres.data_size = cpu_to_le64(old_size); 832 attr_b->nres.valid_size = cpu_to_le64(old_valid); 833 attr_b->nres.alloc_size = cpu_to_le64(old_alloc); 834 835 /* Restore 'attr' and 'mi'. */ 836 if (attr) 837 goto restore_run; 838 839 if (le64_to_cpu(attr_b->nres.svcn) <= svcn && 840 svcn <= le64_to_cpu(attr_b->nres.evcn)) { 841 attr = attr_b; 842 le = le_b; 843 mi = mi_b; 844 } else if (!le_b) { 845 err = -EINVAL; 846 goto bad_inode; 847 } else { 848 le = le_b; 849 attr = ni_find_attr(ni, attr_b, &le, type, name, name_len, 850 &svcn, &mi); 851 if (!attr) 852 goto bad_inode; 853 } 854 855 restore_run: 856 if (mi_pack_runs(mi, attr, run, evcn - svcn + 1)) 857 is_bad = true; 858 859 undo_1: 860 run_deallocate_ex(sbi, run, vcn, alen, NULL, false); 861 862 run_truncate(run, vcn); 863 out: 864 if (is_bad) { 865 bad_inode: 866 _ntfs_bad_inode(&ni->vfs_inode); 867 } 868 return err; 869 } 870 871 /* 872 * attr_data_get_block - Returns 'lcn' and 'len' for given 'vcn'. 873 * 874 * @new == NULL means just to get current mapping for 'vcn' 875 * @new != NULL means allocate real cluster if 'vcn' maps to hole 876 * @zero - zeroout new allocated clusters 877 * 878 * NOTE: 879 * - @new != NULL is called only for sparsed or compressed attributes. 880 * - new allocated clusters are zeroed via blkdev_issue_zeroout. 881 */ 882 int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn, 883 CLST *len, bool *new, bool zero) 884 { 885 int err = 0; 886 struct runs_tree *run = &ni->file.run; 887 struct ntfs_sb_info *sbi; 888 u8 cluster_bits; 889 struct ATTRIB *attr, *attr_b; 890 struct ATTR_LIST_ENTRY *le, *le_b; 891 struct mft_inode *mi, *mi_b; 892 CLST hint, svcn, to_alloc, evcn1, next_svcn, asize, end, vcn0, alen; 893 CLST alloc, evcn; 894 unsigned fr; 895 u64 total_size, total_size0; 896 int step = 0; 897 898 if (new) 899 *new = false; 900 901 /* Try to find in cache. */ 902 down_read(&ni->file.run_lock); 903 if (!run_lookup_entry(run, vcn, lcn, len, NULL)) 904 *len = 0; 905 up_read(&ni->file.run_lock); 906 907 if (*len && (*lcn != SPARSE_LCN || !new)) 908 return 0; /* Fast normal way without allocation. */ 909 910 /* No cluster in cache or we need to allocate cluster in hole. */ 911 sbi = ni->mi.sbi; 912 cluster_bits = sbi->cluster_bits; 913 914 ni_lock(ni); 915 down_write(&ni->file.run_lock); 916 917 /* Repeat the code above (under write lock). */ 918 if (!run_lookup_entry(run, vcn, lcn, len, NULL)) 919 *len = 0; 920 921 if (*len) { 922 if (*lcn != SPARSE_LCN || !new) 923 goto out; /* normal way without allocation. */ 924 if (clen > *len) 925 clen = *len; 926 } 927 928 le_b = NULL; 929 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b); 930 if (!attr_b) { 931 err = -ENOENT; 932 goto out; 933 } 934 935 if (!attr_b->non_res) { 936 *lcn = RESIDENT_LCN; 937 *len = 1; 938 goto out; 939 } 940 941 asize = le64_to_cpu(attr_b->nres.alloc_size) >> cluster_bits; 942 if (vcn >= asize) { 943 if (new) { 944 err = -EINVAL; 945 } else { 946 *len = 1; 947 *lcn = SPARSE_LCN; 948 } 949 goto out; 950 } 951 952 svcn = le64_to_cpu(attr_b->nres.svcn); 953 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1; 954 955 attr = attr_b; 956 le = le_b; 957 mi = mi_b; 958 959 if (le_b && (vcn < svcn || evcn1 <= vcn)) { 960 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn, 961 &mi); 962 if (!attr) { 963 err = -EINVAL; 964 goto out; 965 } 966 svcn = le64_to_cpu(attr->nres.svcn); 967 evcn1 = le64_to_cpu(attr->nres.evcn) + 1; 968 } 969 970 /* Load in cache actual information. */ 971 err = attr_load_runs(attr, ni, run, NULL); 972 if (err) 973 goto out; 974 975 if (!*len) { 976 if (run_lookup_entry(run, vcn, lcn, len, NULL)) { 977 if (*lcn != SPARSE_LCN || !new) 978 goto ok; /* Slow normal way without allocation. */ 979 980 if (clen > *len) 981 clen = *len; 982 } else if (!new) { 983 /* Here we may return -ENOENT. 984 * In any case caller gets zero length. */ 985 goto ok; 986 } 987 } 988 989 if (!is_attr_ext(attr_b)) { 990 /* The code below only for sparsed or compressed attributes. */ 991 err = -EINVAL; 992 goto out; 993 } 994 995 vcn0 = vcn; 996 to_alloc = clen; 997 fr = (sbi->record_size - le32_to_cpu(mi->mrec->used) + 8) / 3 + 1; 998 /* Allocate frame aligned clusters. 999 * ntfs.sys usually uses 16 clusters per frame for sparsed or compressed. 1000 * ntfs3 uses 1 cluster per frame for new created sparsed files. */ 1001 if (attr_b->nres.c_unit) { 1002 CLST clst_per_frame = 1u << attr_b->nres.c_unit; 1003 CLST cmask = ~(clst_per_frame - 1); 1004 1005 /* Get frame aligned vcn and to_alloc. */ 1006 vcn = vcn0 & cmask; 1007 to_alloc = ((vcn0 + clen + clst_per_frame - 1) & cmask) - vcn; 1008 if (fr < clst_per_frame) 1009 fr = clst_per_frame; 1010 zero = true; 1011 1012 /* Check if 'vcn' and 'vcn0' in different attribute segments. */ 1013 if (vcn < svcn || evcn1 <= vcn) { 1014 /* Load attribute for truncated vcn. */ 1015 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, 1016 &vcn, &mi); 1017 if (!attr) { 1018 err = -EINVAL; 1019 goto out; 1020 } 1021 svcn = le64_to_cpu(attr->nres.svcn); 1022 evcn1 = le64_to_cpu(attr->nres.evcn) + 1; 1023 err = attr_load_runs(attr, ni, run, NULL); 1024 if (err) 1025 goto out; 1026 } 1027 } 1028 1029 if (vcn + to_alloc > asize) 1030 to_alloc = asize - vcn; 1031 1032 /* Get the last LCN to allocate from. */ 1033 hint = 0; 1034 1035 if (vcn > evcn1) { 1036 if (!run_add_entry(run, evcn1, SPARSE_LCN, vcn - evcn1, 1037 false)) { 1038 err = -ENOMEM; 1039 goto out; 1040 } 1041 } else if (vcn && !run_lookup_entry(run, vcn - 1, &hint, NULL, NULL)) { 1042 hint = -1; 1043 } 1044 1045 /* Allocate and zeroout new clusters. */ 1046 err = attr_allocate_clusters(sbi, run, vcn, hint + 1, to_alloc, NULL, 1047 zero ? ALLOCATE_ZERO : ALLOCATE_DEF, &alen, 1048 fr, lcn, len); 1049 if (err) 1050 goto out; 1051 *new = true; 1052 step = 1; 1053 1054 end = vcn + alen; 1055 /* Save 'total_size0' to restore if error. */ 1056 total_size0 = le64_to_cpu(attr_b->nres.total_size); 1057 total_size = total_size0 + ((u64)alen << cluster_bits); 1058 1059 if (vcn != vcn0) { 1060 if (!run_lookup_entry(run, vcn0, lcn, len, NULL)) { 1061 err = -EINVAL; 1062 goto out; 1063 } 1064 if (*lcn == SPARSE_LCN) { 1065 /* Internal error. Should not happened. */ 1066 WARN_ON(1); 1067 err = -EINVAL; 1068 goto out; 1069 } 1070 /* Check case when vcn0 + len overlaps new allocated clusters. */ 1071 if (vcn0 + *len > end) 1072 *len = end - vcn0; 1073 } 1074 1075 repack: 1076 err = mi_pack_runs(mi, attr, run, max(end, evcn1) - svcn); 1077 if (err) 1078 goto out; 1079 1080 attr_b->nres.total_size = cpu_to_le64(total_size); 1081 inode_set_bytes(&ni->vfs_inode, total_size); 1082 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 1083 1084 mi_b->dirty = true; 1085 mark_inode_dirty(&ni->vfs_inode); 1086 1087 /* Stored [vcn : next_svcn) from [vcn : end). */ 1088 next_svcn = le64_to_cpu(attr->nres.evcn) + 1; 1089 1090 if (end <= evcn1) { 1091 if (next_svcn == evcn1) { 1092 /* Normal way. Update attribute and exit. */ 1093 goto ok; 1094 } 1095 /* Add new segment [next_svcn : evcn1 - next_svcn). */ 1096 if (!ni->attr_list.size) { 1097 err = ni_create_attr_list(ni); 1098 if (err) 1099 goto undo1; 1100 /* Layout of records is changed. */ 1101 le_b = NULL; 1102 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 1103 0, NULL, &mi_b); 1104 if (!attr_b) { 1105 err = -ENOENT; 1106 goto out; 1107 } 1108 1109 attr = attr_b; 1110 le = le_b; 1111 mi = mi_b; 1112 goto repack; 1113 } 1114 } 1115 1116 /* 1117 * The code below may require additional cluster (to extend attribute list) 1118 * and / or one MFT record 1119 * It is too complex to undo operations if -ENOSPC occurs deep inside 1120 * in 'ni_insert_nonresident'. 1121 * Return in advance -ENOSPC here if there are no free cluster and no free MFT. 1122 */ 1123 if (!ntfs_check_for_free_space(sbi, 1, 1)) { 1124 /* Undo step 1. */ 1125 err = -ENOSPC; 1126 goto undo1; 1127 } 1128 1129 step = 2; 1130 svcn = evcn1; 1131 1132 /* Estimate next attribute. */ 1133 attr = ni_find_attr(ni, attr, &le, ATTR_DATA, NULL, 0, &svcn, &mi); 1134 1135 if (!attr) { 1136 /* Insert new attribute segment. */ 1137 goto ins_ext; 1138 } 1139 1140 /* Try to update existed attribute segment. */ 1141 alloc = bytes_to_cluster(sbi, le64_to_cpu(attr_b->nres.alloc_size)); 1142 evcn = le64_to_cpu(attr->nres.evcn); 1143 1144 if (end < next_svcn) 1145 end = next_svcn; 1146 while (end > evcn) { 1147 /* Remove segment [svcn : evcn). */ 1148 mi_remove_attr(NULL, mi, attr); 1149 1150 if (!al_remove_le(ni, le)) { 1151 err = -EINVAL; 1152 goto out; 1153 } 1154 1155 if (evcn + 1 >= alloc) { 1156 /* Last attribute segment. */ 1157 evcn1 = evcn + 1; 1158 goto ins_ext; 1159 } 1160 1161 if (ni_load_mi(ni, le, &mi)) { 1162 attr = NULL; 1163 goto out; 1164 } 1165 1166 attr = mi_find_attr(mi, NULL, ATTR_DATA, NULL, 0, &le->id); 1167 if (!attr) { 1168 err = -EINVAL; 1169 goto out; 1170 } 1171 svcn = le64_to_cpu(attr->nres.svcn); 1172 evcn = le64_to_cpu(attr->nres.evcn); 1173 } 1174 1175 if (end < svcn) 1176 end = svcn; 1177 1178 err = attr_load_runs(attr, ni, run, &end); 1179 if (err) 1180 goto out; 1181 1182 evcn1 = evcn + 1; 1183 attr->nres.svcn = cpu_to_le64(next_svcn); 1184 err = mi_pack_runs(mi, attr, run, evcn1 - next_svcn); 1185 if (err) 1186 goto out; 1187 1188 le->vcn = cpu_to_le64(next_svcn); 1189 ni->attr_list.dirty = true; 1190 mi->dirty = true; 1191 next_svcn = le64_to_cpu(attr->nres.evcn) + 1; 1192 1193 ins_ext: 1194 if (evcn1 > next_svcn) { 1195 err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run, 1196 next_svcn, evcn1 - next_svcn, 1197 attr_b->flags, &attr, &mi, NULL); 1198 if (err) 1199 goto out; 1200 } 1201 ok: 1202 run_truncate_around(run, vcn); 1203 out: 1204 if (err && step > 1) { 1205 /* Too complex to restore. */ 1206 _ntfs_bad_inode(&ni->vfs_inode); 1207 } 1208 up_write(&ni->file.run_lock); 1209 ni_unlock(ni); 1210 1211 return err; 1212 1213 undo1: 1214 /* Undo step1. */ 1215 attr_b->nres.total_size = cpu_to_le64(total_size0); 1216 inode_set_bytes(&ni->vfs_inode, total_size0); 1217 1218 if (run_deallocate_ex(sbi, run, vcn, alen, NULL, false) || 1219 !run_add_entry(run, vcn, SPARSE_LCN, alen, false) || 1220 mi_pack_runs(mi, attr, run, max(end, evcn1) - svcn)) { 1221 _ntfs_bad_inode(&ni->vfs_inode); 1222 } 1223 goto out; 1224 } 1225 1226 int attr_data_read_resident(struct ntfs_inode *ni, struct page *page) 1227 { 1228 u64 vbo; 1229 struct ATTRIB *attr; 1230 u32 data_size; 1231 1232 attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, NULL); 1233 if (!attr) 1234 return -EINVAL; 1235 1236 if (attr->non_res) 1237 return E_NTFS_NONRESIDENT; 1238 1239 vbo = page->index << PAGE_SHIFT; 1240 data_size = le32_to_cpu(attr->res.data_size); 1241 if (vbo < data_size) { 1242 const char *data = resident_data(attr); 1243 char *kaddr = kmap_atomic(page); 1244 u32 use = data_size - vbo; 1245 1246 if (use > PAGE_SIZE) 1247 use = PAGE_SIZE; 1248 1249 memcpy(kaddr, data + vbo, use); 1250 memset(kaddr + use, 0, PAGE_SIZE - use); 1251 kunmap_atomic(kaddr); 1252 flush_dcache_page(page); 1253 SetPageUptodate(page); 1254 } else if (!PageUptodate(page)) { 1255 zero_user_segment(page, 0, PAGE_SIZE); 1256 SetPageUptodate(page); 1257 } 1258 1259 return 0; 1260 } 1261 1262 int attr_data_write_resident(struct ntfs_inode *ni, struct page *page) 1263 { 1264 u64 vbo; 1265 struct mft_inode *mi; 1266 struct ATTRIB *attr; 1267 u32 data_size; 1268 1269 attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, &mi); 1270 if (!attr) 1271 return -EINVAL; 1272 1273 if (attr->non_res) { 1274 /* Return special error code to check this case. */ 1275 return E_NTFS_NONRESIDENT; 1276 } 1277 1278 vbo = page->index << PAGE_SHIFT; 1279 data_size = le32_to_cpu(attr->res.data_size); 1280 if (vbo < data_size) { 1281 char *data = resident_data(attr); 1282 char *kaddr = kmap_atomic(page); 1283 u32 use = data_size - vbo; 1284 1285 if (use > PAGE_SIZE) 1286 use = PAGE_SIZE; 1287 memcpy(data + vbo, kaddr, use); 1288 kunmap_atomic(kaddr); 1289 mi->dirty = true; 1290 } 1291 ni->i_valid = data_size; 1292 1293 return 0; 1294 } 1295 1296 /* 1297 * attr_load_runs_vcn - Load runs with VCN. 1298 */ 1299 int attr_load_runs_vcn(struct ntfs_inode *ni, enum ATTR_TYPE type, 1300 const __le16 *name, u8 name_len, struct runs_tree *run, 1301 CLST vcn) 1302 { 1303 struct ATTRIB *attr; 1304 int err; 1305 CLST svcn, evcn; 1306 u16 ro; 1307 1308 if (!ni) { 1309 /* Is record corrupted? */ 1310 return -ENOENT; 1311 } 1312 1313 attr = ni_find_attr(ni, NULL, NULL, type, name, name_len, &vcn, NULL); 1314 if (!attr) { 1315 /* Is record corrupted? */ 1316 return -ENOENT; 1317 } 1318 1319 svcn = le64_to_cpu(attr->nres.svcn); 1320 evcn = le64_to_cpu(attr->nres.evcn); 1321 1322 if (evcn < vcn || vcn < svcn) { 1323 /* Is record corrupted? */ 1324 return -EINVAL; 1325 } 1326 1327 ro = le16_to_cpu(attr->nres.run_off); 1328 1329 if (ro > le32_to_cpu(attr->size)) 1330 return -EINVAL; 1331 1332 err = run_unpack_ex(run, ni->mi.sbi, ni->mi.rno, svcn, evcn, svcn, 1333 Add2Ptr(attr, ro), le32_to_cpu(attr->size) - ro); 1334 if (err < 0) 1335 return err; 1336 return 0; 1337 } 1338 1339 /* 1340 * attr_load_runs_range - Load runs for given range [from to). 1341 */ 1342 int attr_load_runs_range(struct ntfs_inode *ni, enum ATTR_TYPE type, 1343 const __le16 *name, u8 name_len, struct runs_tree *run, 1344 u64 from, u64 to) 1345 { 1346 struct ntfs_sb_info *sbi = ni->mi.sbi; 1347 u8 cluster_bits = sbi->cluster_bits; 1348 CLST vcn; 1349 CLST vcn_last = (to - 1) >> cluster_bits; 1350 CLST lcn, clen; 1351 int err; 1352 1353 for (vcn = from >> cluster_bits; vcn <= vcn_last; vcn += clen) { 1354 if (!run_lookup_entry(run, vcn, &lcn, &clen, NULL)) { 1355 err = attr_load_runs_vcn(ni, type, name, name_len, run, 1356 vcn); 1357 if (err) 1358 return err; 1359 clen = 0; /* Next run_lookup_entry(vcn) must be success. */ 1360 } 1361 } 1362 1363 return 0; 1364 } 1365 1366 #ifdef CONFIG_NTFS3_LZX_XPRESS 1367 /* 1368 * attr_wof_frame_info 1369 * 1370 * Read header of Xpress/LZX file to get info about frame. 1371 */ 1372 int attr_wof_frame_info(struct ntfs_inode *ni, struct ATTRIB *attr, 1373 struct runs_tree *run, u64 frame, u64 frames, 1374 u8 frame_bits, u32 *ondisk_size, u64 *vbo_data) 1375 { 1376 struct ntfs_sb_info *sbi = ni->mi.sbi; 1377 u64 vbo[2], off[2], wof_size; 1378 u32 voff; 1379 u8 bytes_per_off; 1380 char *addr; 1381 struct page *page; 1382 int i, err; 1383 __le32 *off32; 1384 __le64 *off64; 1385 1386 if (ni->vfs_inode.i_size < 0x100000000ull) { 1387 /* File starts with array of 32 bit offsets. */ 1388 bytes_per_off = sizeof(__le32); 1389 vbo[1] = frame << 2; 1390 *vbo_data = frames << 2; 1391 } else { 1392 /* File starts with array of 64 bit offsets. */ 1393 bytes_per_off = sizeof(__le64); 1394 vbo[1] = frame << 3; 1395 *vbo_data = frames << 3; 1396 } 1397 1398 /* 1399 * Read 4/8 bytes at [vbo - 4(8)] == offset where compressed frame starts. 1400 * Read 4/8 bytes at [vbo] == offset where compressed frame ends. 1401 */ 1402 if (!attr->non_res) { 1403 if (vbo[1] + bytes_per_off > le32_to_cpu(attr->res.data_size)) { 1404 ntfs_inode_err(&ni->vfs_inode, "is corrupted"); 1405 return -EINVAL; 1406 } 1407 addr = resident_data(attr); 1408 1409 if (bytes_per_off == sizeof(__le32)) { 1410 off32 = Add2Ptr(addr, vbo[1]); 1411 off[0] = vbo[1] ? le32_to_cpu(off32[-1]) : 0; 1412 off[1] = le32_to_cpu(off32[0]); 1413 } else { 1414 off64 = Add2Ptr(addr, vbo[1]); 1415 off[0] = vbo[1] ? le64_to_cpu(off64[-1]) : 0; 1416 off[1] = le64_to_cpu(off64[0]); 1417 } 1418 1419 *vbo_data += off[0]; 1420 *ondisk_size = off[1] - off[0]; 1421 return 0; 1422 } 1423 1424 wof_size = le64_to_cpu(attr->nres.data_size); 1425 down_write(&ni->file.run_lock); 1426 page = ni->file.offs_page; 1427 if (!page) { 1428 page = alloc_page(GFP_KERNEL); 1429 if (!page) { 1430 err = -ENOMEM; 1431 goto out; 1432 } 1433 page->index = -1; 1434 ni->file.offs_page = page; 1435 } 1436 lock_page(page); 1437 addr = page_address(page); 1438 1439 if (vbo[1]) { 1440 voff = vbo[1] & (PAGE_SIZE - 1); 1441 vbo[0] = vbo[1] - bytes_per_off; 1442 i = 0; 1443 } else { 1444 voff = 0; 1445 vbo[0] = 0; 1446 off[0] = 0; 1447 i = 1; 1448 } 1449 1450 do { 1451 pgoff_t index = vbo[i] >> PAGE_SHIFT; 1452 1453 if (index != page->index) { 1454 u64 from = vbo[i] & ~(u64)(PAGE_SIZE - 1); 1455 u64 to = min(from + PAGE_SIZE, wof_size); 1456 1457 err = attr_load_runs_range(ni, ATTR_DATA, WOF_NAME, 1458 ARRAY_SIZE(WOF_NAME), run, 1459 from, to); 1460 if (err) 1461 goto out1; 1462 1463 err = ntfs_bio_pages(sbi, run, &page, 1, from, 1464 to - from, REQ_OP_READ); 1465 if (err) { 1466 page->index = -1; 1467 goto out1; 1468 } 1469 page->index = index; 1470 } 1471 1472 if (i) { 1473 if (bytes_per_off == sizeof(__le32)) { 1474 off32 = Add2Ptr(addr, voff); 1475 off[1] = le32_to_cpu(*off32); 1476 } else { 1477 off64 = Add2Ptr(addr, voff); 1478 off[1] = le64_to_cpu(*off64); 1479 } 1480 } else if (!voff) { 1481 if (bytes_per_off == sizeof(__le32)) { 1482 off32 = Add2Ptr(addr, PAGE_SIZE - sizeof(u32)); 1483 off[0] = le32_to_cpu(*off32); 1484 } else { 1485 off64 = Add2Ptr(addr, PAGE_SIZE - sizeof(u64)); 1486 off[0] = le64_to_cpu(*off64); 1487 } 1488 } else { 1489 /* Two values in one page. */ 1490 if (bytes_per_off == sizeof(__le32)) { 1491 off32 = Add2Ptr(addr, voff); 1492 off[0] = le32_to_cpu(off32[-1]); 1493 off[1] = le32_to_cpu(off32[0]); 1494 } else { 1495 off64 = Add2Ptr(addr, voff); 1496 off[0] = le64_to_cpu(off64[-1]); 1497 off[1] = le64_to_cpu(off64[0]); 1498 } 1499 break; 1500 } 1501 } while (++i < 2); 1502 1503 *vbo_data += off[0]; 1504 *ondisk_size = off[1] - off[0]; 1505 1506 out1: 1507 unlock_page(page); 1508 out: 1509 up_write(&ni->file.run_lock); 1510 return err; 1511 } 1512 #endif 1513 1514 /* 1515 * attr_is_frame_compressed - Used to detect compressed frame. 1516 */ 1517 int attr_is_frame_compressed(struct ntfs_inode *ni, struct ATTRIB *attr, 1518 CLST frame, CLST *clst_data) 1519 { 1520 int err; 1521 u32 clst_frame; 1522 CLST clen, lcn, vcn, alen, slen, vcn_next; 1523 size_t idx; 1524 struct runs_tree *run; 1525 1526 *clst_data = 0; 1527 1528 if (!is_attr_compressed(attr)) 1529 return 0; 1530 1531 if (!attr->non_res) 1532 return 0; 1533 1534 clst_frame = 1u << attr->nres.c_unit; 1535 vcn = frame * clst_frame; 1536 run = &ni->file.run; 1537 1538 if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) { 1539 err = attr_load_runs_vcn(ni, attr->type, attr_name(attr), 1540 attr->name_len, run, vcn); 1541 if (err) 1542 return err; 1543 1544 if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) 1545 return -EINVAL; 1546 } 1547 1548 if (lcn == SPARSE_LCN) { 1549 /* Sparsed frame. */ 1550 return 0; 1551 } 1552 1553 if (clen >= clst_frame) { 1554 /* 1555 * The frame is not compressed 'cause 1556 * it does not contain any sparse clusters. 1557 */ 1558 *clst_data = clst_frame; 1559 return 0; 1560 } 1561 1562 alen = bytes_to_cluster(ni->mi.sbi, le64_to_cpu(attr->nres.alloc_size)); 1563 slen = 0; 1564 *clst_data = clen; 1565 1566 /* 1567 * The frame is compressed if *clst_data + slen >= clst_frame. 1568 * Check next fragments. 1569 */ 1570 while ((vcn += clen) < alen) { 1571 vcn_next = vcn; 1572 1573 if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) || 1574 vcn_next != vcn) { 1575 err = attr_load_runs_vcn(ni, attr->type, 1576 attr_name(attr), 1577 attr->name_len, run, vcn_next); 1578 if (err) 1579 return err; 1580 vcn = vcn_next; 1581 1582 if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) 1583 return -EINVAL; 1584 } 1585 1586 if (lcn == SPARSE_LCN) { 1587 slen += clen; 1588 } else { 1589 if (slen) { 1590 /* 1591 * Data_clusters + sparse_clusters = 1592 * not enough for frame. 1593 */ 1594 return -EINVAL; 1595 } 1596 *clst_data += clen; 1597 } 1598 1599 if (*clst_data + slen >= clst_frame) { 1600 if (!slen) { 1601 /* 1602 * There is no sparsed clusters in this frame 1603 * so it is not compressed. 1604 */ 1605 *clst_data = clst_frame; 1606 } else { 1607 /* Frame is compressed. */ 1608 } 1609 break; 1610 } 1611 } 1612 1613 return 0; 1614 } 1615 1616 /* 1617 * attr_allocate_frame - Allocate/free clusters for @frame. 1618 * 1619 * Assumed: down_write(&ni->file.run_lock); 1620 */ 1621 int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size, 1622 u64 new_valid) 1623 { 1624 int err = 0; 1625 struct runs_tree *run = &ni->file.run; 1626 struct ntfs_sb_info *sbi = ni->mi.sbi; 1627 struct ATTRIB *attr = NULL, *attr_b; 1628 struct ATTR_LIST_ENTRY *le, *le_b; 1629 struct mft_inode *mi, *mi_b; 1630 CLST svcn, evcn1, next_svcn, len; 1631 CLST vcn, end, clst_data; 1632 u64 total_size, valid_size, data_size; 1633 1634 le_b = NULL; 1635 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b); 1636 if (!attr_b) 1637 return -ENOENT; 1638 1639 if (!is_attr_ext(attr_b)) 1640 return -EINVAL; 1641 1642 vcn = frame << NTFS_LZNT_CUNIT; 1643 total_size = le64_to_cpu(attr_b->nres.total_size); 1644 1645 svcn = le64_to_cpu(attr_b->nres.svcn); 1646 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1; 1647 data_size = le64_to_cpu(attr_b->nres.data_size); 1648 1649 if (svcn <= vcn && vcn < evcn1) { 1650 attr = attr_b; 1651 le = le_b; 1652 mi = mi_b; 1653 } else if (!le_b) { 1654 err = -EINVAL; 1655 goto out; 1656 } else { 1657 le = le_b; 1658 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn, 1659 &mi); 1660 if (!attr) { 1661 err = -EINVAL; 1662 goto out; 1663 } 1664 svcn = le64_to_cpu(attr->nres.svcn); 1665 evcn1 = le64_to_cpu(attr->nres.evcn) + 1; 1666 } 1667 1668 err = attr_load_runs(attr, ni, run, NULL); 1669 if (err) 1670 goto out; 1671 1672 err = attr_is_frame_compressed(ni, attr_b, frame, &clst_data); 1673 if (err) 1674 goto out; 1675 1676 total_size -= (u64)clst_data << sbi->cluster_bits; 1677 1678 len = bytes_to_cluster(sbi, compr_size); 1679 1680 if (len == clst_data) 1681 goto out; 1682 1683 if (len < clst_data) { 1684 err = run_deallocate_ex(sbi, run, vcn + len, clst_data - len, 1685 NULL, true); 1686 if (err) 1687 goto out; 1688 1689 if (!run_add_entry(run, vcn + len, SPARSE_LCN, clst_data - len, 1690 false)) { 1691 err = -ENOMEM; 1692 goto out; 1693 } 1694 end = vcn + clst_data; 1695 /* Run contains updated range [vcn + len : end). */ 1696 } else { 1697 CLST alen, hint = 0; 1698 /* Get the last LCN to allocate from. */ 1699 if (vcn + clst_data && 1700 !run_lookup_entry(run, vcn + clst_data - 1, &hint, NULL, 1701 NULL)) { 1702 hint = -1; 1703 } 1704 1705 err = attr_allocate_clusters(sbi, run, vcn + clst_data, 1706 hint + 1, len - clst_data, NULL, 1707 ALLOCATE_DEF, &alen, 0, NULL, 1708 NULL); 1709 if (err) 1710 goto out; 1711 1712 end = vcn + len; 1713 /* Run contains updated range [vcn + clst_data : end). */ 1714 } 1715 1716 total_size += (u64)len << sbi->cluster_bits; 1717 1718 repack: 1719 err = mi_pack_runs(mi, attr, run, max(end, evcn1) - svcn); 1720 if (err) 1721 goto out; 1722 1723 attr_b->nres.total_size = cpu_to_le64(total_size); 1724 inode_set_bytes(&ni->vfs_inode, total_size); 1725 1726 mi_b->dirty = true; 1727 mark_inode_dirty(&ni->vfs_inode); 1728 1729 /* Stored [vcn : next_svcn) from [vcn : end). */ 1730 next_svcn = le64_to_cpu(attr->nres.evcn) + 1; 1731 1732 if (end <= evcn1) { 1733 if (next_svcn == evcn1) { 1734 /* Normal way. Update attribute and exit. */ 1735 goto ok; 1736 } 1737 /* Add new segment [next_svcn : evcn1 - next_svcn). */ 1738 if (!ni->attr_list.size) { 1739 err = ni_create_attr_list(ni); 1740 if (err) 1741 goto out; 1742 /* Layout of records is changed. */ 1743 le_b = NULL; 1744 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 1745 0, NULL, &mi_b); 1746 if (!attr_b) { 1747 err = -ENOENT; 1748 goto out; 1749 } 1750 1751 attr = attr_b; 1752 le = le_b; 1753 mi = mi_b; 1754 goto repack; 1755 } 1756 } 1757 1758 svcn = evcn1; 1759 1760 /* Estimate next attribute. */ 1761 attr = ni_find_attr(ni, attr, &le, ATTR_DATA, NULL, 0, &svcn, &mi); 1762 1763 if (attr) { 1764 CLST alloc = bytes_to_cluster( 1765 sbi, le64_to_cpu(attr_b->nres.alloc_size)); 1766 CLST evcn = le64_to_cpu(attr->nres.evcn); 1767 1768 if (end < next_svcn) 1769 end = next_svcn; 1770 while (end > evcn) { 1771 /* Remove segment [svcn : evcn). */ 1772 mi_remove_attr(NULL, mi, attr); 1773 1774 if (!al_remove_le(ni, le)) { 1775 err = -EINVAL; 1776 goto out; 1777 } 1778 1779 if (evcn + 1 >= alloc) { 1780 /* Last attribute segment. */ 1781 evcn1 = evcn + 1; 1782 goto ins_ext; 1783 } 1784 1785 if (ni_load_mi(ni, le, &mi)) { 1786 attr = NULL; 1787 goto out; 1788 } 1789 1790 attr = mi_find_attr(mi, NULL, ATTR_DATA, NULL, 0, 1791 &le->id); 1792 if (!attr) { 1793 err = -EINVAL; 1794 goto out; 1795 } 1796 svcn = le64_to_cpu(attr->nres.svcn); 1797 evcn = le64_to_cpu(attr->nres.evcn); 1798 } 1799 1800 if (end < svcn) 1801 end = svcn; 1802 1803 err = attr_load_runs(attr, ni, run, &end); 1804 if (err) 1805 goto out; 1806 1807 evcn1 = evcn + 1; 1808 attr->nres.svcn = cpu_to_le64(next_svcn); 1809 err = mi_pack_runs(mi, attr, run, evcn1 - next_svcn); 1810 if (err) 1811 goto out; 1812 1813 le->vcn = cpu_to_le64(next_svcn); 1814 ni->attr_list.dirty = true; 1815 mi->dirty = true; 1816 1817 next_svcn = le64_to_cpu(attr->nres.evcn) + 1; 1818 } 1819 ins_ext: 1820 if (evcn1 > next_svcn) { 1821 err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run, 1822 next_svcn, evcn1 - next_svcn, 1823 attr_b->flags, &attr, &mi, NULL); 1824 if (err) 1825 goto out; 1826 } 1827 ok: 1828 run_truncate_around(run, vcn); 1829 out: 1830 if (attr_b) { 1831 if (new_valid > data_size) 1832 new_valid = data_size; 1833 1834 valid_size = le64_to_cpu(attr_b->nres.valid_size); 1835 if (new_valid != valid_size) { 1836 attr_b->nres.valid_size = cpu_to_le64(valid_size); 1837 mi_b->dirty = true; 1838 } 1839 } 1840 1841 return err; 1842 } 1843 1844 /* 1845 * attr_collapse_range - Collapse range in file. 1846 */ 1847 int attr_collapse_range(struct ntfs_inode *ni, u64 vbo, u64 bytes) 1848 { 1849 int err = 0; 1850 struct runs_tree *run = &ni->file.run; 1851 struct ntfs_sb_info *sbi = ni->mi.sbi; 1852 struct ATTRIB *attr = NULL, *attr_b; 1853 struct ATTR_LIST_ENTRY *le, *le_b; 1854 struct mft_inode *mi, *mi_b; 1855 CLST svcn, evcn1, len, dealloc, alen; 1856 CLST vcn, end; 1857 u64 valid_size, data_size, alloc_size, total_size; 1858 u32 mask; 1859 __le16 a_flags; 1860 1861 if (!bytes) 1862 return 0; 1863 1864 le_b = NULL; 1865 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b); 1866 if (!attr_b) 1867 return -ENOENT; 1868 1869 if (!attr_b->non_res) { 1870 /* Attribute is resident. Nothing to do? */ 1871 return 0; 1872 } 1873 1874 data_size = le64_to_cpu(attr_b->nres.data_size); 1875 alloc_size = le64_to_cpu(attr_b->nres.alloc_size); 1876 a_flags = attr_b->flags; 1877 1878 if (is_attr_ext(attr_b)) { 1879 total_size = le64_to_cpu(attr_b->nres.total_size); 1880 mask = (sbi->cluster_size << attr_b->nres.c_unit) - 1; 1881 } else { 1882 total_size = alloc_size; 1883 mask = sbi->cluster_mask; 1884 } 1885 1886 if ((vbo & mask) || (bytes & mask)) { 1887 /* Allow to collapse only cluster aligned ranges. */ 1888 return -EINVAL; 1889 } 1890 1891 if (vbo > data_size) 1892 return -EINVAL; 1893 1894 down_write(&ni->file.run_lock); 1895 1896 if (vbo + bytes >= data_size) { 1897 u64 new_valid = min(ni->i_valid, vbo); 1898 1899 /* Simple truncate file at 'vbo'. */ 1900 truncate_setsize(&ni->vfs_inode, vbo); 1901 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, vbo, 1902 &new_valid, true, NULL); 1903 1904 if (!err && new_valid < ni->i_valid) 1905 ni->i_valid = new_valid; 1906 1907 goto out; 1908 } 1909 1910 /* 1911 * Enumerate all attribute segments and collapse. 1912 */ 1913 alen = alloc_size >> sbi->cluster_bits; 1914 vcn = vbo >> sbi->cluster_bits; 1915 len = bytes >> sbi->cluster_bits; 1916 end = vcn + len; 1917 dealloc = 0; 1918 1919 svcn = le64_to_cpu(attr_b->nres.svcn); 1920 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1; 1921 1922 if (svcn <= vcn && vcn < evcn1) { 1923 attr = attr_b; 1924 le = le_b; 1925 mi = mi_b; 1926 } else if (!le_b) { 1927 err = -EINVAL; 1928 goto out; 1929 } else { 1930 le = le_b; 1931 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn, 1932 &mi); 1933 if (!attr) { 1934 err = -EINVAL; 1935 goto out; 1936 } 1937 1938 svcn = le64_to_cpu(attr->nres.svcn); 1939 evcn1 = le64_to_cpu(attr->nres.evcn) + 1; 1940 } 1941 1942 for (;;) { 1943 if (svcn >= end) { 1944 /* Shift VCN- */ 1945 attr->nres.svcn = cpu_to_le64(svcn - len); 1946 attr->nres.evcn = cpu_to_le64(evcn1 - 1 - len); 1947 if (le) { 1948 le->vcn = attr->nres.svcn; 1949 ni->attr_list.dirty = true; 1950 } 1951 mi->dirty = true; 1952 } else if (svcn < vcn || end < evcn1) { 1953 CLST vcn1, eat, next_svcn; 1954 1955 /* Collapse a part of this attribute segment. */ 1956 err = attr_load_runs(attr, ni, run, &svcn); 1957 if (err) 1958 goto out; 1959 vcn1 = max(vcn, svcn); 1960 eat = min(end, evcn1) - vcn1; 1961 1962 err = run_deallocate_ex(sbi, run, vcn1, eat, &dealloc, 1963 true); 1964 if (err) 1965 goto out; 1966 1967 if (!run_collapse_range(run, vcn1, eat)) { 1968 err = -ENOMEM; 1969 goto out; 1970 } 1971 1972 if (svcn >= vcn) { 1973 /* Shift VCN */ 1974 attr->nres.svcn = cpu_to_le64(vcn); 1975 if (le) { 1976 le->vcn = attr->nres.svcn; 1977 ni->attr_list.dirty = true; 1978 } 1979 } 1980 1981 err = mi_pack_runs(mi, attr, run, evcn1 - svcn - eat); 1982 if (err) 1983 goto out; 1984 1985 next_svcn = le64_to_cpu(attr->nres.evcn) + 1; 1986 if (next_svcn + eat < evcn1) { 1987 err = ni_insert_nonresident( 1988 ni, ATTR_DATA, NULL, 0, run, next_svcn, 1989 evcn1 - eat - next_svcn, a_flags, &attr, 1990 &mi, &le); 1991 if (err) 1992 goto out; 1993 1994 /* Layout of records maybe changed. */ 1995 attr_b = NULL; 1996 } 1997 1998 /* Free all allocated memory. */ 1999 run_truncate(run, 0); 2000 } else { 2001 u16 le_sz; 2002 u16 roff = le16_to_cpu(attr->nres.run_off); 2003 2004 if (roff > le32_to_cpu(attr->size)) { 2005 err = -EINVAL; 2006 goto out; 2007 } 2008 2009 run_unpack_ex(RUN_DEALLOCATE, sbi, ni->mi.rno, svcn, 2010 evcn1 - 1, svcn, Add2Ptr(attr, roff), 2011 le32_to_cpu(attr->size) - roff); 2012 2013 /* Delete this attribute segment. */ 2014 mi_remove_attr(NULL, mi, attr); 2015 if (!le) 2016 break; 2017 2018 le_sz = le16_to_cpu(le->size); 2019 if (!al_remove_le(ni, le)) { 2020 err = -EINVAL; 2021 goto out; 2022 } 2023 2024 if (evcn1 >= alen) 2025 break; 2026 2027 if (!svcn) { 2028 /* Load next record that contains this attribute. */ 2029 if (ni_load_mi(ni, le, &mi)) { 2030 err = -EINVAL; 2031 goto out; 2032 } 2033 2034 /* Look for required attribute. */ 2035 attr = mi_find_attr(mi, NULL, ATTR_DATA, NULL, 2036 0, &le->id); 2037 if (!attr) { 2038 err = -EINVAL; 2039 goto out; 2040 } 2041 goto next_attr; 2042 } 2043 le = (struct ATTR_LIST_ENTRY *)((u8 *)le - le_sz); 2044 } 2045 2046 if (evcn1 >= alen) 2047 break; 2048 2049 attr = ni_enum_attr_ex(ni, attr, &le, &mi); 2050 if (!attr) { 2051 err = -EINVAL; 2052 goto out; 2053 } 2054 2055 next_attr: 2056 svcn = le64_to_cpu(attr->nres.svcn); 2057 evcn1 = le64_to_cpu(attr->nres.evcn) + 1; 2058 } 2059 2060 if (!attr_b) { 2061 le_b = NULL; 2062 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, 2063 &mi_b); 2064 if (!attr_b) { 2065 err = -ENOENT; 2066 goto out; 2067 } 2068 } 2069 2070 data_size -= bytes; 2071 valid_size = ni->i_valid; 2072 if (vbo + bytes <= valid_size) 2073 valid_size -= bytes; 2074 else if (vbo < valid_size) 2075 valid_size = vbo; 2076 2077 attr_b->nres.alloc_size = cpu_to_le64(alloc_size - bytes); 2078 attr_b->nres.data_size = cpu_to_le64(data_size); 2079 attr_b->nres.valid_size = cpu_to_le64(min(valid_size, data_size)); 2080 total_size -= (u64)dealloc << sbi->cluster_bits; 2081 if (is_attr_ext(attr_b)) 2082 attr_b->nres.total_size = cpu_to_le64(total_size); 2083 mi_b->dirty = true; 2084 2085 /* Update inode size. */ 2086 ni->i_valid = valid_size; 2087 i_size_write(&ni->vfs_inode, data_size); 2088 inode_set_bytes(&ni->vfs_inode, total_size); 2089 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 2090 mark_inode_dirty(&ni->vfs_inode); 2091 2092 out: 2093 up_write(&ni->file.run_lock); 2094 if (err) 2095 _ntfs_bad_inode(&ni->vfs_inode); 2096 2097 return err; 2098 } 2099 2100 /* 2101 * attr_punch_hole 2102 * 2103 * Not for normal files. 2104 */ 2105 int attr_punch_hole(struct ntfs_inode *ni, u64 vbo, u64 bytes, u32 *frame_size) 2106 { 2107 int err = 0; 2108 struct runs_tree *run = &ni->file.run; 2109 struct ntfs_sb_info *sbi = ni->mi.sbi; 2110 struct ATTRIB *attr = NULL, *attr_b; 2111 struct ATTR_LIST_ENTRY *le, *le_b; 2112 struct mft_inode *mi, *mi_b; 2113 CLST svcn, evcn1, vcn, len, end, alen, hole, next_svcn; 2114 u64 total_size, alloc_size; 2115 u32 mask; 2116 __le16 a_flags; 2117 struct runs_tree run2; 2118 2119 if (!bytes) 2120 return 0; 2121 2122 le_b = NULL; 2123 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b); 2124 if (!attr_b) 2125 return -ENOENT; 2126 2127 if (!attr_b->non_res) { 2128 u32 data_size = le32_to_cpu(attr_b->res.data_size); 2129 u32 from, to; 2130 2131 if (vbo > data_size) 2132 return 0; 2133 2134 from = vbo; 2135 to = min_t(u64, vbo + bytes, data_size); 2136 memset(Add2Ptr(resident_data(attr_b), from), 0, to - from); 2137 return 0; 2138 } 2139 2140 if (!is_attr_ext(attr_b)) 2141 return -EOPNOTSUPP; 2142 2143 alloc_size = le64_to_cpu(attr_b->nres.alloc_size); 2144 total_size = le64_to_cpu(attr_b->nres.total_size); 2145 2146 if (vbo >= alloc_size) { 2147 /* NOTE: It is allowed. */ 2148 return 0; 2149 } 2150 2151 mask = (sbi->cluster_size << attr_b->nres.c_unit) - 1; 2152 2153 bytes += vbo; 2154 if (bytes > alloc_size) 2155 bytes = alloc_size; 2156 bytes -= vbo; 2157 2158 if ((vbo & mask) || (bytes & mask)) { 2159 /* We have to zero a range(s). */ 2160 if (frame_size == NULL) { 2161 /* Caller insists range is aligned. */ 2162 return -EINVAL; 2163 } 2164 *frame_size = mask + 1; 2165 return E_NTFS_NOTALIGNED; 2166 } 2167 2168 down_write(&ni->file.run_lock); 2169 run_init(&run2); 2170 run_truncate(run, 0); 2171 2172 /* 2173 * Enumerate all attribute segments and punch hole where necessary. 2174 */ 2175 alen = alloc_size >> sbi->cluster_bits; 2176 vcn = vbo >> sbi->cluster_bits; 2177 len = bytes >> sbi->cluster_bits; 2178 end = vcn + len; 2179 hole = 0; 2180 2181 svcn = le64_to_cpu(attr_b->nres.svcn); 2182 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1; 2183 a_flags = attr_b->flags; 2184 2185 if (svcn <= vcn && vcn < evcn1) { 2186 attr = attr_b; 2187 le = le_b; 2188 mi = mi_b; 2189 } else if (!le_b) { 2190 err = -EINVAL; 2191 goto bad_inode; 2192 } else { 2193 le = le_b; 2194 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn, 2195 &mi); 2196 if (!attr) { 2197 err = -EINVAL; 2198 goto bad_inode; 2199 } 2200 2201 svcn = le64_to_cpu(attr->nres.svcn); 2202 evcn1 = le64_to_cpu(attr->nres.evcn) + 1; 2203 } 2204 2205 while (svcn < end) { 2206 CLST vcn1, zero, hole2 = hole; 2207 2208 err = attr_load_runs(attr, ni, run, &svcn); 2209 if (err) 2210 goto done; 2211 vcn1 = max(vcn, svcn); 2212 zero = min(end, evcn1) - vcn1; 2213 2214 /* 2215 * Check range [vcn1 + zero). 2216 * Calculate how many clusters there are. 2217 * Don't do any destructive actions. 2218 */ 2219 err = run_deallocate_ex(NULL, run, vcn1, zero, &hole2, false); 2220 if (err) 2221 goto done; 2222 2223 /* Check if required range is already hole. */ 2224 if (hole2 == hole) 2225 goto next_attr; 2226 2227 /* Make a clone of run to undo. */ 2228 err = run_clone(run, &run2); 2229 if (err) 2230 goto done; 2231 2232 /* Make a hole range (sparse) [vcn1 + zero). */ 2233 if (!run_add_entry(run, vcn1, SPARSE_LCN, zero, false)) { 2234 err = -ENOMEM; 2235 goto done; 2236 } 2237 2238 /* Update run in attribute segment. */ 2239 err = mi_pack_runs(mi, attr, run, evcn1 - svcn); 2240 if (err) 2241 goto done; 2242 next_svcn = le64_to_cpu(attr->nres.evcn) + 1; 2243 if (next_svcn < evcn1) { 2244 /* Insert new attribute segment. */ 2245 err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run, 2246 next_svcn, 2247 evcn1 - next_svcn, a_flags, 2248 &attr, &mi, &le); 2249 if (err) 2250 goto undo_punch; 2251 2252 /* Layout of records maybe changed. */ 2253 attr_b = NULL; 2254 } 2255 2256 /* Real deallocate. Should not fail. */ 2257 run_deallocate_ex(sbi, &run2, vcn1, zero, &hole, true); 2258 2259 next_attr: 2260 /* Free all allocated memory. */ 2261 run_truncate(run, 0); 2262 2263 if (evcn1 >= alen) 2264 break; 2265 2266 /* Get next attribute segment. */ 2267 attr = ni_enum_attr_ex(ni, attr, &le, &mi); 2268 if (!attr) { 2269 err = -EINVAL; 2270 goto bad_inode; 2271 } 2272 2273 svcn = le64_to_cpu(attr->nres.svcn); 2274 evcn1 = le64_to_cpu(attr->nres.evcn) + 1; 2275 } 2276 2277 done: 2278 if (!hole) 2279 goto out; 2280 2281 if (!attr_b) { 2282 attr_b = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, 2283 &mi_b); 2284 if (!attr_b) { 2285 err = -EINVAL; 2286 goto bad_inode; 2287 } 2288 } 2289 2290 total_size -= (u64)hole << sbi->cluster_bits; 2291 attr_b->nres.total_size = cpu_to_le64(total_size); 2292 mi_b->dirty = true; 2293 2294 /* Update inode size. */ 2295 inode_set_bytes(&ni->vfs_inode, total_size); 2296 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 2297 mark_inode_dirty(&ni->vfs_inode); 2298 2299 out: 2300 run_close(&run2); 2301 up_write(&ni->file.run_lock); 2302 return err; 2303 2304 bad_inode: 2305 _ntfs_bad_inode(&ni->vfs_inode); 2306 goto out; 2307 2308 undo_punch: 2309 /* 2310 * Restore packed runs. 2311 * 'mi_pack_runs' should not fail, cause we restore original. 2312 */ 2313 if (mi_pack_runs(mi, attr, &run2, evcn1 - svcn)) 2314 goto bad_inode; 2315 2316 goto done; 2317 } 2318 2319 /* 2320 * attr_insert_range - Insert range (hole) in file. 2321 * Not for normal files. 2322 */ 2323 int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes) 2324 { 2325 int err = 0; 2326 struct runs_tree *run = &ni->file.run; 2327 struct ntfs_sb_info *sbi = ni->mi.sbi; 2328 struct ATTRIB *attr = NULL, *attr_b; 2329 struct ATTR_LIST_ENTRY *le, *le_b; 2330 struct mft_inode *mi, *mi_b; 2331 CLST vcn, svcn, evcn1, len, next_svcn; 2332 u64 data_size, alloc_size; 2333 u32 mask; 2334 __le16 a_flags; 2335 2336 if (!bytes) 2337 return 0; 2338 2339 le_b = NULL; 2340 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b); 2341 if (!attr_b) 2342 return -ENOENT; 2343 2344 if (!is_attr_ext(attr_b)) { 2345 /* It was checked above. See fallocate. */ 2346 return -EOPNOTSUPP; 2347 } 2348 2349 if (!attr_b->non_res) { 2350 data_size = le32_to_cpu(attr_b->res.data_size); 2351 alloc_size = data_size; 2352 mask = sbi->cluster_mask; /* cluster_size - 1 */ 2353 } else { 2354 data_size = le64_to_cpu(attr_b->nres.data_size); 2355 alloc_size = le64_to_cpu(attr_b->nres.alloc_size); 2356 mask = (sbi->cluster_size << attr_b->nres.c_unit) - 1; 2357 } 2358 2359 if (vbo > data_size) { 2360 /* Insert range after the file size is not allowed. */ 2361 return -EINVAL; 2362 } 2363 2364 if ((vbo & mask) || (bytes & mask)) { 2365 /* Allow to insert only frame aligned ranges. */ 2366 return -EINVAL; 2367 } 2368 2369 /* 2370 * valid_size <= data_size <= alloc_size 2371 * Check alloc_size for maximum possible. 2372 */ 2373 if (bytes > sbi->maxbytes_sparse - alloc_size) 2374 return -EFBIG; 2375 2376 vcn = vbo >> sbi->cluster_bits; 2377 len = bytes >> sbi->cluster_bits; 2378 2379 down_write(&ni->file.run_lock); 2380 2381 if (!attr_b->non_res) { 2382 err = attr_set_size(ni, ATTR_DATA, NULL, 0, run, 2383 data_size + bytes, NULL, false, NULL); 2384 2385 le_b = NULL; 2386 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, 2387 &mi_b); 2388 if (!attr_b) { 2389 err = -EINVAL; 2390 goto bad_inode; 2391 } 2392 2393 if (err) 2394 goto out; 2395 2396 if (!attr_b->non_res) { 2397 /* Still resident. */ 2398 char *data = Add2Ptr(attr_b, 2399 le16_to_cpu(attr_b->res.data_off)); 2400 2401 memmove(data + bytes, data, bytes); 2402 memset(data, 0, bytes); 2403 goto done; 2404 } 2405 2406 /* Resident files becomes nonresident. */ 2407 data_size = le64_to_cpu(attr_b->nres.data_size); 2408 alloc_size = le64_to_cpu(attr_b->nres.alloc_size); 2409 } 2410 2411 /* 2412 * Enumerate all attribute segments and shift start vcn. 2413 */ 2414 a_flags = attr_b->flags; 2415 svcn = le64_to_cpu(attr_b->nres.svcn); 2416 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1; 2417 2418 if (svcn <= vcn && vcn < evcn1) { 2419 attr = attr_b; 2420 le = le_b; 2421 mi = mi_b; 2422 } else if (!le_b) { 2423 err = -EINVAL; 2424 goto bad_inode; 2425 } else { 2426 le = le_b; 2427 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn, 2428 &mi); 2429 if (!attr) { 2430 err = -EINVAL; 2431 goto bad_inode; 2432 } 2433 2434 svcn = le64_to_cpu(attr->nres.svcn); 2435 evcn1 = le64_to_cpu(attr->nres.evcn) + 1; 2436 } 2437 2438 run_truncate(run, 0); /* clear cached values. */ 2439 err = attr_load_runs(attr, ni, run, NULL); 2440 if (err) 2441 goto out; 2442 2443 if (!run_insert_range(run, vcn, len)) { 2444 err = -ENOMEM; 2445 goto out; 2446 } 2447 2448 /* Try to pack in current record as much as possible. */ 2449 err = mi_pack_runs(mi, attr, run, evcn1 + len - svcn); 2450 if (err) 2451 goto out; 2452 2453 next_svcn = le64_to_cpu(attr->nres.evcn) + 1; 2454 2455 while ((attr = ni_enum_attr_ex(ni, attr, &le, &mi)) && 2456 attr->type == ATTR_DATA && !attr->name_len) { 2457 le64_add_cpu(&attr->nres.svcn, len); 2458 le64_add_cpu(&attr->nres.evcn, len); 2459 if (le) { 2460 le->vcn = attr->nres.svcn; 2461 ni->attr_list.dirty = true; 2462 } 2463 mi->dirty = true; 2464 } 2465 2466 if (next_svcn < evcn1 + len) { 2467 err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run, 2468 next_svcn, evcn1 + len - next_svcn, 2469 a_flags, NULL, NULL, NULL); 2470 2471 le_b = NULL; 2472 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, 2473 &mi_b); 2474 if (!attr_b) { 2475 err = -EINVAL; 2476 goto bad_inode; 2477 } 2478 2479 if (err) { 2480 /* ni_insert_nonresident failed. Try to undo. */ 2481 goto undo_insert_range; 2482 } 2483 } 2484 2485 /* 2486 * Update primary attribute segment. 2487 */ 2488 if (vbo <= ni->i_valid) 2489 ni->i_valid += bytes; 2490 2491 attr_b->nres.data_size = cpu_to_le64(data_size + bytes); 2492 attr_b->nres.alloc_size = cpu_to_le64(alloc_size + bytes); 2493 2494 /* ni->valid may be not equal valid_size (temporary). */ 2495 if (ni->i_valid > data_size + bytes) 2496 attr_b->nres.valid_size = attr_b->nres.data_size; 2497 else 2498 attr_b->nres.valid_size = cpu_to_le64(ni->i_valid); 2499 mi_b->dirty = true; 2500 2501 done: 2502 i_size_write(&ni->vfs_inode, ni->vfs_inode.i_size + bytes); 2503 ni->ni_flags |= NI_FLAG_UPDATE_PARENT; 2504 mark_inode_dirty(&ni->vfs_inode); 2505 2506 out: 2507 run_truncate(run, 0); /* clear cached values. */ 2508 2509 up_write(&ni->file.run_lock); 2510 2511 return err; 2512 2513 bad_inode: 2514 _ntfs_bad_inode(&ni->vfs_inode); 2515 goto out; 2516 2517 undo_insert_range: 2518 svcn = le64_to_cpu(attr_b->nres.svcn); 2519 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1; 2520 2521 if (svcn <= vcn && vcn < evcn1) { 2522 attr = attr_b; 2523 le = le_b; 2524 mi = mi_b; 2525 } else if (!le_b) { 2526 goto bad_inode; 2527 } else { 2528 le = le_b; 2529 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn, 2530 &mi); 2531 if (!attr) { 2532 goto bad_inode; 2533 } 2534 2535 svcn = le64_to_cpu(attr->nres.svcn); 2536 evcn1 = le64_to_cpu(attr->nres.evcn) + 1; 2537 } 2538 2539 if (attr_load_runs(attr, ni, run, NULL)) 2540 goto bad_inode; 2541 2542 if (!run_collapse_range(run, vcn, len)) 2543 goto bad_inode; 2544 2545 if (mi_pack_runs(mi, attr, run, evcn1 + len - svcn)) 2546 goto bad_inode; 2547 2548 while ((attr = ni_enum_attr_ex(ni, attr, &le, &mi)) && 2549 attr->type == ATTR_DATA && !attr->name_len) { 2550 le64_sub_cpu(&attr->nres.svcn, len); 2551 le64_sub_cpu(&attr->nres.evcn, len); 2552 if (le) { 2553 le->vcn = attr->nres.svcn; 2554 ni->attr_list.dirty = true; 2555 } 2556 mi->dirty = true; 2557 } 2558 2559 goto out; 2560 } 2561