1 /* Copyright (c) Mark Harmstone 2016-17 2 * Copyright (c) Reimar Doeffinger 2006 3 * Copyright (c) Markus Oberhumer 1996 4 * 5 * This file is part of WinBtrfs. 6 * 7 * WinBtrfs is free software: you can redistribute it and/or modify 8 * it under the terms of the GNU Lesser General Public Licence as published by 9 * the Free Software Foundation, either version 3 of the Licence, or 10 * (at your option) any later version. 11 * 12 * WinBtrfs is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU Lesser General Public Licence for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public Licence 18 * along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */ 19 20 // Portions of the LZO decompression code here were cribbed from code in 21 // libavcodec, also under the LGPL. Thank you, Reimar Doeffinger. 22 23 // The LZO compression code comes from v0.22 of lzo, written way back in 24 // 1996, and available here: 25 // https://www.ibiblio.org/pub/historic-linux/ftp-archives/sunsite.unc.edu/Sep-29-1996/libs/lzo-0.22.tar.gz 26 // Modern versions of lzo are licensed under the GPL, but the very oldest 27 // versions are under the LGPL and hence okay to use here. 28 29 #include "btrfs_drv.h" 30 31 #define Z_SOLO 32 #define ZLIB_INTERNAL 33 34 #ifndef __REACTOS__ 35 #include "zlib/zlib.h" 36 #include "zlib/inftrees.h" 37 #include "zlib/inflate.h" 38 #else 39 #include <zlib.h> 40 #endif 41 42 #define ZSTD_STATIC_LINKING_ONLY 43 44 #include "zstd/zstd.h" 45 46 #define LINUX_PAGE_SIZE 4096 47 48 typedef struct { 49 UINT8* in; 50 UINT32 inlen; 51 UINT32 inpos; 52 UINT8* out; 53 UINT32 outlen; 54 UINT32 outpos; 55 BOOL error; 56 void* wrkmem; 57 } lzo_stream; 58 59 #define LZO1X_MEM_COMPRESS ((UINT32) (16384L * sizeof(UINT8*))) 60 61 #define M1_MAX_OFFSET 0x0400 62 #define M2_MAX_OFFSET 0x0800 63 #define M3_MAX_OFFSET 0x4000 64 #define M4_MAX_OFFSET 0xbfff 65 66 #define MX_MAX_OFFSET (M1_MAX_OFFSET + M2_MAX_OFFSET) 67 68 #define M1_MARKER 0 69 #define M2_MARKER 64 70 #define M3_MARKER 32 71 #define M4_MARKER 16 72 73 #define _DV2(p, shift1, shift2) (((( (UINT32)(p[2]) << shift1) ^ p[1]) << shift2) ^ p[0]) 74 #define DVAL_NEXT(dv, p) dv ^= p[-1]; dv = (((dv) >> 5) ^ ((UINT32)(p[2]) << (2*5))) 75 #define _DV(p, shift) _DV2(p, shift, shift) 76 #define DVAL_FIRST(dv, p) dv = _DV((p), 5) 77 #define _DINDEX(dv, p) ((40799u * (dv)) >> 5) 78 #define DINDEX(dv, p) (((_DINDEX(dv, p)) & 0x3fff) << 0) 79 #define UPDATE_D(dict, cycle, dv, p) dict[DINDEX(dv, p)] = (p) 80 #define UPDATE_I(dict, cycle, index, p) dict[index] = (p) 81 82 #define LZO_CHECK_MPOS_NON_DET(m_pos, m_off, in, ip, max_offset) \ 83 ((void*) m_pos < (void*) in || \ 84 (m_off = (UINT8*) ip - (UINT8*) m_pos) <= 0 || \ 85 m_off > max_offset) 86 87 #define LZO_BYTE(x) ((unsigned char) (x)) 88 89 #define ZSTD_ALLOC_TAG 0x6474737a // "zstd" 90 91 // needs to be the same as Linux (fs/btrfs/zstd.c) 92 #define ZSTD_BTRFS_MAX_WINDOWLOG 17 93 94 static void* zstd_malloc(void* opaque, size_t size); 95 static void zstd_free(void* opaque, void* address); 96 97 #ifndef __REACTOS__ 98 ZSTD_customMem zstd_mem = { .customAlloc = zstd_malloc, .customFree = zstd_free, .opaque = NULL }; 99 #else 100 ZSTD_customMem zstd_mem = { zstd_malloc, zstd_free, NULL }; 101 #endif 102 103 static UINT8 lzo_nextbyte(lzo_stream* stream) { 104 UINT8 c; 105 106 if (stream->inpos >= stream->inlen) { 107 stream->error = TRUE; 108 return 0; 109 } 110 111 c = stream->in[stream->inpos]; 112 stream->inpos++; 113 114 return c; 115 } 116 117 static int lzo_len(lzo_stream* stream, int byte, int mask) { 118 int len = byte & mask; 119 120 if (len == 0) { 121 while (!(byte = lzo_nextbyte(stream))) { 122 if (stream->error) return 0; 123 124 len += 255; 125 } 126 127 len += mask + byte; 128 } 129 130 return len; 131 } 132 133 static void lzo_copy(lzo_stream* stream, int len) { 134 if (stream->inpos + len > stream->inlen) { 135 stream->error = TRUE; 136 return; 137 } 138 139 if (stream->outpos + len > stream->outlen) { 140 stream->error = TRUE; 141 return; 142 } 143 144 do { 145 stream->out[stream->outpos] = stream->in[stream->inpos]; 146 stream->inpos++; 147 stream->outpos++; 148 len--; 149 } while (len > 0); 150 } 151 152 static void lzo_copyback(lzo_stream* stream, UINT32 back, int len) { 153 if (stream->outpos < back) { 154 stream->error = TRUE; 155 return; 156 } 157 158 if (stream->outpos + len > stream->outlen) { 159 stream->error = TRUE; 160 return; 161 } 162 163 do { 164 stream->out[stream->outpos] = stream->out[stream->outpos - back]; 165 stream->outpos++; 166 len--; 167 } while (len > 0); 168 } 169 170 static NTSTATUS do_lzo_decompress(lzo_stream* stream) { 171 UINT8 byte; 172 UINT32 len, back; 173 BOOL backcopy = FALSE; 174 175 stream->error = FALSE; 176 177 byte = lzo_nextbyte(stream); 178 if (stream->error) return STATUS_INTERNAL_ERROR; 179 180 if (byte > 17) { 181 lzo_copy(stream, min((UINT8)(byte - 17), (UINT32)(stream->outlen - stream->outpos))); 182 if (stream->error) return STATUS_INTERNAL_ERROR; 183 184 if (stream->outlen == stream->outpos) 185 return STATUS_SUCCESS; 186 187 byte = lzo_nextbyte(stream); 188 if (stream->error) return STATUS_INTERNAL_ERROR; 189 190 if (byte < 16) return STATUS_INTERNAL_ERROR; 191 } 192 193 while (1) { 194 if (byte >> 4) { 195 backcopy = TRUE; 196 if (byte >> 6) { 197 len = (byte >> 5) - 1; 198 back = (lzo_nextbyte(stream) << 3) + ((byte >> 2) & 7) + 1; 199 if (stream->error) return STATUS_INTERNAL_ERROR; 200 } else if (byte >> 5) { 201 len = lzo_len(stream, byte, 31); 202 if (stream->error) return STATUS_INTERNAL_ERROR; 203 204 byte = lzo_nextbyte(stream); 205 if (stream->error) return STATUS_INTERNAL_ERROR; 206 207 back = (lzo_nextbyte(stream) << 6) + (byte >> 2) + 1; 208 if (stream->error) return STATUS_INTERNAL_ERROR; 209 } else { 210 len = lzo_len(stream, byte, 7); 211 if (stream->error) return STATUS_INTERNAL_ERROR; 212 213 back = (1 << 14) + ((byte & 8) << 11); 214 215 byte = lzo_nextbyte(stream); 216 if (stream->error) return STATUS_INTERNAL_ERROR; 217 218 back += (lzo_nextbyte(stream) << 6) + (byte >> 2); 219 if (stream->error) return STATUS_INTERNAL_ERROR; 220 221 if (back == (1 << 14)) { 222 if (len != 1) 223 return STATUS_INTERNAL_ERROR; 224 break; 225 } 226 } 227 } else if (backcopy) { 228 len = 0; 229 back = (lzo_nextbyte(stream) << 2) + (byte >> 2) + 1; 230 if (stream->error) return STATUS_INTERNAL_ERROR; 231 } else { 232 len = lzo_len(stream, byte, 15); 233 if (stream->error) return STATUS_INTERNAL_ERROR; 234 235 lzo_copy(stream, min(len + 3, stream->outlen - stream->outpos)); 236 if (stream->error) return STATUS_INTERNAL_ERROR; 237 238 if (stream->outlen == stream->outpos) 239 return STATUS_SUCCESS; 240 241 byte = lzo_nextbyte(stream); 242 if (stream->error) return STATUS_INTERNAL_ERROR; 243 244 if (byte >> 4) 245 continue; 246 247 len = 1; 248 back = (1 << 11) + (lzo_nextbyte(stream) << 2) + (byte >> 2) + 1; 249 if (stream->error) return STATUS_INTERNAL_ERROR; 250 251 break; 252 } 253 254 lzo_copyback(stream, back, min(len + 2, stream->outlen - stream->outpos)); 255 if (stream->error) return STATUS_INTERNAL_ERROR; 256 257 if (stream->outlen == stream->outpos) 258 return STATUS_SUCCESS; 259 260 len = byte & 3; 261 262 if (len) { 263 lzo_copy(stream, min(len, stream->outlen - stream->outpos)); 264 if (stream->error) return STATUS_INTERNAL_ERROR; 265 266 if (stream->outlen == stream->outpos) 267 return STATUS_SUCCESS; 268 } else 269 backcopy = !backcopy; 270 271 byte = lzo_nextbyte(stream); 272 if (stream->error) return STATUS_INTERNAL_ERROR; 273 } 274 275 return STATUS_SUCCESS; 276 } 277 278 NTSTATUS lzo_decompress(UINT8* inbuf, UINT32 inlen, UINT8* outbuf, UINT32 outlen, UINT32 inpageoff) { 279 NTSTATUS Status; 280 UINT32 partlen, inoff, outoff; 281 lzo_stream stream; 282 283 inoff = 0; 284 outoff = 0; 285 286 do { 287 partlen = *(UINT32*)&inbuf[inoff]; 288 289 if (partlen + inoff > inlen) { 290 ERR("overflow: %x + %x > %llx\n", partlen, inoff, inlen); 291 return STATUS_INTERNAL_ERROR; 292 } 293 294 inoff += sizeof(UINT32); 295 296 stream.in = &inbuf[inoff]; 297 stream.inlen = partlen; 298 stream.inpos = 0; 299 stream.out = &outbuf[outoff]; 300 stream.outlen = min(outlen, LINUX_PAGE_SIZE); 301 stream.outpos = 0; 302 303 Status = do_lzo_decompress(&stream); 304 if (!NT_SUCCESS(Status)) { 305 ERR("do_lzo_decompress returned %08x\n", Status); 306 return Status; 307 } 308 309 if (stream.outpos < stream.outlen) 310 RtlZeroMemory(&stream.out[stream.outpos], stream.outlen - stream.outpos); 311 312 inoff += partlen; 313 outoff += stream.outlen; 314 315 if (LINUX_PAGE_SIZE - ((inpageoff + inoff) % LINUX_PAGE_SIZE) < sizeof(UINT32)) 316 inoff = ((((inpageoff + inoff) / LINUX_PAGE_SIZE) + 1) * LINUX_PAGE_SIZE) - inpageoff; 317 318 outlen -= stream.outlen; 319 } while (inoff < inlen && outlen > 0); 320 321 return STATUS_SUCCESS; 322 } 323 324 static void* zlib_alloc(void* opaque, unsigned int items, unsigned int size) { 325 UNUSED(opaque); 326 327 return ExAllocatePoolWithTag(PagedPool, items * size, ALLOC_TAG_ZLIB); 328 } 329 330 static void zlib_free(void* opaque, void* ptr) { 331 UNUSED(opaque); 332 333 ExFreePool(ptr); 334 } 335 336 NTSTATUS zlib_decompress(UINT8* inbuf, UINT32 inlen, UINT8* outbuf, UINT32 outlen) { 337 z_stream c_stream; 338 int ret; 339 340 c_stream.zalloc = zlib_alloc; 341 c_stream.zfree = zlib_free; 342 c_stream.opaque = (voidpf)0; 343 344 ret = inflateInit(&c_stream); 345 346 if (ret != Z_OK) { 347 ERR("inflateInit returned %08x\n", ret); 348 return STATUS_INTERNAL_ERROR; 349 } 350 351 c_stream.next_in = inbuf; 352 c_stream.avail_in = inlen; 353 354 c_stream.next_out = outbuf; 355 c_stream.avail_out = outlen; 356 357 do { 358 ret = inflate(&c_stream, Z_NO_FLUSH); 359 360 if (ret != Z_OK && ret != Z_STREAM_END) { 361 ERR("inflate returned %08x\n", ret); 362 inflateEnd(&c_stream); 363 return STATUS_INTERNAL_ERROR; 364 } 365 366 if (c_stream.avail_out == 0) 367 break; 368 } while (ret != Z_STREAM_END); 369 370 ret = inflateEnd(&c_stream); 371 372 if (ret != Z_OK) { 373 ERR("inflateEnd returned %08x\n", ret); 374 return STATUS_INTERNAL_ERROR; 375 } 376 377 // FIXME - if we're short, should we zero the end of outbuf so we don't leak information into userspace? 378 379 return STATUS_SUCCESS; 380 } 381 382 static NTSTATUS zlib_write_compressed_bit(fcb* fcb, UINT64 start_data, UINT64 end_data, void* data, BOOL* compressed, PIRP Irp, LIST_ENTRY* rollback) { 383 NTSTATUS Status; 384 UINT8 compression; 385 UINT32 comp_length; 386 UINT8* comp_data; 387 UINT32 out_left; 388 LIST_ENTRY* le; 389 chunk* c; 390 z_stream c_stream; 391 int ret; 392 393 comp_data = ExAllocatePoolWithTag(PagedPool, (UINT32)(end_data - start_data), ALLOC_TAG); 394 if (!comp_data) { 395 ERR("out of memory\n"); 396 return STATUS_INSUFFICIENT_RESOURCES; 397 } 398 399 Status = excise_extents(fcb->Vcb, fcb, start_data, end_data, Irp, rollback); 400 if (!NT_SUCCESS(Status)) { 401 ERR("excise_extents returned %08x\n", Status); 402 ExFreePool(comp_data); 403 return Status; 404 } 405 406 c_stream.zalloc = zlib_alloc; 407 c_stream.zfree = zlib_free; 408 c_stream.opaque = (voidpf)0; 409 410 ret = deflateInit(&c_stream, fcb->Vcb->options.zlib_level); 411 412 if (ret != Z_OK) { 413 ERR("deflateInit returned %08x\n", ret); 414 ExFreePool(comp_data); 415 return STATUS_INTERNAL_ERROR; 416 } 417 418 c_stream.avail_in = (UINT32)(end_data - start_data); 419 c_stream.next_in = data; 420 c_stream.avail_out = (UINT32)(end_data - start_data); 421 c_stream.next_out = comp_data; 422 423 do { 424 ret = deflate(&c_stream, Z_FINISH); 425 426 if (ret == Z_STREAM_ERROR) { 427 ERR("deflate returned %x\n", ret); 428 ExFreePool(comp_data); 429 return STATUS_INTERNAL_ERROR; 430 } 431 } while (c_stream.avail_in > 0 && c_stream.avail_out > 0); 432 433 out_left = c_stream.avail_out; 434 435 ret = deflateEnd(&c_stream); 436 437 if (ret != Z_OK) { 438 ERR("deflateEnd returned %08x\n", ret); 439 ExFreePool(comp_data); 440 return STATUS_INTERNAL_ERROR; 441 } 442 443 if (out_left < fcb->Vcb->superblock.sector_size) { // compressed extent would be larger than or same size as uncompressed extent 444 ExFreePool(comp_data); 445 446 comp_length = (UINT32)(end_data - start_data); 447 comp_data = data; 448 compression = BTRFS_COMPRESSION_NONE; 449 450 *compressed = FALSE; 451 } else { 452 UINT32 cl; 453 454 compression = BTRFS_COMPRESSION_ZLIB; 455 cl = (UINT32)(end_data - start_data - out_left); 456 comp_length = (UINT32)sector_align(cl, fcb->Vcb->superblock.sector_size); 457 458 RtlZeroMemory(comp_data + cl, comp_length - cl); 459 460 *compressed = TRUE; 461 } 462 463 ExAcquireResourceSharedLite(&fcb->Vcb->chunk_lock, TRUE); 464 465 le = fcb->Vcb->chunks.Flink; 466 while (le != &fcb->Vcb->chunks) { 467 c = CONTAINING_RECORD(le, chunk, list_entry); 468 469 if (!c->readonly && !c->reloc) { 470 acquire_chunk_lock(c, fcb->Vcb); 471 472 if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) { 473 if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, FALSE, comp_data, Irp, rollback, compression, end_data - start_data, FALSE, 0)) { 474 ExReleaseResourceLite(&fcb->Vcb->chunk_lock); 475 476 if (compression != BTRFS_COMPRESSION_NONE) 477 ExFreePool(comp_data); 478 479 return STATUS_SUCCESS; 480 } 481 } 482 483 release_chunk_lock(c, fcb->Vcb); 484 } 485 486 le = le->Flink; 487 } 488 489 ExReleaseResourceLite(&fcb->Vcb->chunk_lock); 490 491 ExAcquireResourceExclusiveLite(&fcb->Vcb->chunk_lock, TRUE); 492 493 Status = alloc_chunk(fcb->Vcb, fcb->Vcb->data_flags, &c, FALSE); 494 495 ExReleaseResourceLite(&fcb->Vcb->chunk_lock); 496 497 if (!NT_SUCCESS(Status)) { 498 ERR("alloc_chunk returned %08x\n", Status); 499 500 if (compression != BTRFS_COMPRESSION_NONE) 501 ExFreePool(comp_data); 502 503 return Status; 504 } 505 506 if (c) { 507 acquire_chunk_lock(c, fcb->Vcb); 508 509 if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) { 510 if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, FALSE, comp_data, Irp, rollback, compression, end_data - start_data, FALSE, 0)) { 511 if (compression != BTRFS_COMPRESSION_NONE) 512 ExFreePool(comp_data); 513 514 return STATUS_SUCCESS; 515 } 516 } 517 518 release_chunk_lock(c, fcb->Vcb); 519 } 520 521 WARN("couldn't find any data chunks with %llx bytes free\n", comp_length); 522 523 if (compression != BTRFS_COMPRESSION_NONE) 524 ExFreePool(comp_data); 525 526 return STATUS_DISK_FULL; 527 } 528 529 static NTSTATUS lzo_do_compress(const UINT8* in, UINT32 in_len, UINT8* out, UINT32* out_len, void* wrkmem) { 530 const UINT8* ip; 531 UINT32 dv; 532 UINT8* op; 533 const UINT8* in_end = in + in_len; 534 const UINT8* ip_end = in + in_len - 9 - 4; 535 const UINT8* ii; 536 const UINT8** dict = (const UINT8**)wrkmem; 537 538 op = out; 539 ip = in; 540 ii = ip; 541 542 DVAL_FIRST(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++; 543 DVAL_NEXT(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++; 544 DVAL_NEXT(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++; 545 DVAL_NEXT(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++; 546 547 while (1) { 548 const UINT8* m_pos; 549 UINT32 m_len; 550 ptrdiff_t m_off; 551 UINT32 lit, dindex; 552 553 dindex = DINDEX(dv, ip); 554 m_pos = dict[dindex]; 555 UPDATE_I(dict, cycle, dindex, ip); 556 557 if (!LZO_CHECK_MPOS_NON_DET(m_pos, m_off, in, ip, M4_MAX_OFFSET) && m_pos[0] == ip[0] && m_pos[1] == ip[1] && m_pos[2] == ip[2]) { 558 lit = (UINT32)(ip - ii); 559 m_pos += 3; 560 if (m_off <= M2_MAX_OFFSET) 561 goto match; 562 563 if (lit == 3) { /* better compression, but slower */ 564 if (op - 2 <= out) 565 return STATUS_INTERNAL_ERROR; 566 567 op[-2] |= LZO_BYTE(3); 568 *op++ = *ii++; *op++ = *ii++; *op++ = *ii++; 569 goto code_match; 570 } 571 572 if (*m_pos == ip[3]) 573 goto match; 574 } 575 576 /* a literal */ 577 ++ip; 578 if (ip >= ip_end) 579 break; 580 DVAL_NEXT(dv, ip); 581 continue; 582 583 /* a match */ 584 match: 585 /* store current literal run */ 586 if (lit > 0) { 587 UINT32 t = lit; 588 589 if (t <= 3) { 590 if (op - 2 <= out) 591 return STATUS_INTERNAL_ERROR; 592 593 op[-2] |= LZO_BYTE(t); 594 } else if (t <= 18) 595 *op++ = LZO_BYTE(t - 3); 596 else { 597 UINT32 tt = t - 18; 598 599 *op++ = 0; 600 while (tt > 255) { 601 tt -= 255; 602 *op++ = 0; 603 } 604 605 if (tt <= 0) 606 return STATUS_INTERNAL_ERROR; 607 608 *op++ = LZO_BYTE(tt); 609 } 610 611 do { 612 *op++ = *ii++; 613 } while (--t > 0); 614 } 615 616 617 /* code the match */ 618 code_match: 619 if (ii != ip) 620 return STATUS_INTERNAL_ERROR; 621 622 ip += 3; 623 if (*m_pos++ != *ip++ || *m_pos++ != *ip++ || *m_pos++ != *ip++ || 624 *m_pos++ != *ip++ || *m_pos++ != *ip++ || *m_pos++ != *ip++) { 625 --ip; 626 m_len = (UINT32)(ip - ii); 627 628 if (m_len < 3 || m_len > 8) 629 return STATUS_INTERNAL_ERROR; 630 631 if (m_off <= M2_MAX_OFFSET) { 632 m_off -= 1; 633 *op++ = LZO_BYTE(((m_len - 1) << 5) | ((m_off & 7) << 2)); 634 *op++ = LZO_BYTE(m_off >> 3); 635 } else if (m_off <= M3_MAX_OFFSET) { 636 m_off -= 1; 637 *op++ = LZO_BYTE(M3_MARKER | (m_len - 2)); 638 goto m3_m4_offset; 639 } else { 640 m_off -= 0x4000; 641 642 if (m_off <= 0 || m_off > 0x7fff) 643 return STATUS_INTERNAL_ERROR; 644 645 *op++ = LZO_BYTE(M4_MARKER | ((m_off & 0x4000) >> 11) | (m_len - 2)); 646 goto m3_m4_offset; 647 } 648 } else { 649 const UINT8* end; 650 end = in_end; 651 while (ip < end && *m_pos == *ip) 652 m_pos++, ip++; 653 m_len = (UINT32)(ip - ii); 654 655 if (m_len < 3) 656 return STATUS_INTERNAL_ERROR; 657 658 if (m_off <= M3_MAX_OFFSET) { 659 m_off -= 1; 660 if (m_len <= 33) 661 *op++ = LZO_BYTE(M3_MARKER | (m_len - 2)); 662 else { 663 m_len -= 33; 664 *op++ = M3_MARKER | 0; 665 goto m3_m4_len; 666 } 667 } else { 668 m_off -= 0x4000; 669 670 if (m_off <= 0 || m_off > 0x7fff) 671 return STATUS_INTERNAL_ERROR; 672 673 if (m_len <= 9) 674 *op++ = LZO_BYTE(M4_MARKER | ((m_off & 0x4000) >> 11) | (m_len - 2)); 675 else { 676 m_len -= 9; 677 *op++ = LZO_BYTE(M4_MARKER | ((m_off & 0x4000) >> 11)); 678 m3_m4_len: 679 while (m_len > 255) { 680 m_len -= 255; 681 *op++ = 0; 682 } 683 684 if (m_len <= 0) 685 return STATUS_INTERNAL_ERROR; 686 687 *op++ = LZO_BYTE(m_len); 688 } 689 } 690 691 m3_m4_offset: 692 *op++ = LZO_BYTE((m_off & 63) << 2); 693 *op++ = LZO_BYTE(m_off >> 6); 694 } 695 696 ii = ip; 697 if (ip >= ip_end) 698 break; 699 DVAL_FIRST(dv, ip); 700 } 701 702 /* store final literal run */ 703 if (in_end - ii > 0) { 704 UINT32 t = (UINT32)(in_end - ii); 705 706 if (op == out && t <= 238) 707 *op++ = LZO_BYTE(17 + t); 708 else if (t <= 3) 709 op[-2] |= LZO_BYTE(t); 710 else if (t <= 18) 711 *op++ = LZO_BYTE(t - 3); 712 else { 713 UINT32 tt = t - 18; 714 715 *op++ = 0; 716 while (tt > 255) { 717 tt -= 255; 718 *op++ = 0; 719 } 720 721 if (tt <= 0) 722 return STATUS_INTERNAL_ERROR; 723 724 *op++ = LZO_BYTE(tt); 725 } 726 727 do { 728 *op++ = *ii++; 729 } while (--t > 0); 730 } 731 732 *out_len = (UINT32)(op - out); 733 734 return STATUS_SUCCESS; 735 } 736 737 static NTSTATUS lzo1x_1_compress(lzo_stream* stream) { 738 UINT8 *op = stream->out; 739 NTSTATUS Status = STATUS_SUCCESS; 740 741 if (stream->inlen <= 0) 742 stream->outlen = 0; 743 else if (stream->inlen <= 9 + 4) { 744 *op++ = LZO_BYTE(17 + stream->inlen); 745 746 stream->inpos = 0; 747 do { 748 *op++ = stream->in[stream->inpos]; 749 stream->inpos++; 750 } while (stream->inlen < stream->inpos); 751 stream->outlen = (UINT32)(op - stream->out); 752 } else 753 Status = lzo_do_compress(stream->in, stream->inlen, stream->out, &stream->outlen, stream->wrkmem); 754 755 if (Status == STATUS_SUCCESS) { 756 op = stream->out + stream->outlen; 757 *op++ = M4_MARKER | 1; 758 *op++ = 0; 759 *op++ = 0; 760 stream->outlen += 3; 761 } 762 763 return Status; 764 } 765 766 static __inline UINT32 lzo_max_outlen(UINT32 inlen) { 767 return inlen + (inlen / 16) + 64 + 3; // formula comes from LZO.FAQ 768 } 769 770 static NTSTATUS lzo_write_compressed_bit(fcb* fcb, UINT64 start_data, UINT64 end_data, void* data, BOOL* compressed, PIRP Irp, LIST_ENTRY* rollback) { 771 NTSTATUS Status; 772 UINT8 compression; 773 UINT64 comp_length; 774 ULONG comp_data_len, num_pages, i; 775 UINT8* comp_data; 776 BOOL skip_compression = FALSE; 777 lzo_stream stream; 778 UINT32* out_size; 779 LIST_ENTRY* le; 780 chunk* c; 781 782 num_pages = (ULONG)((sector_align(end_data - start_data, LINUX_PAGE_SIZE)) / LINUX_PAGE_SIZE); 783 784 // Four-byte overall header 785 // Another four-byte header page 786 // Each page has a maximum size of lzo_max_outlen(LINUX_PAGE_SIZE) 787 // Plus another four bytes for possible padding 788 comp_data_len = sizeof(UINT32) + ((lzo_max_outlen(LINUX_PAGE_SIZE) + (2 * sizeof(UINT32))) * num_pages); 789 790 comp_data = ExAllocatePoolWithTag(PagedPool, comp_data_len, ALLOC_TAG); 791 if (!comp_data) { 792 ERR("out of memory\n"); 793 return STATUS_INSUFFICIENT_RESOURCES; 794 } 795 796 stream.wrkmem = ExAllocatePoolWithTag(PagedPool, LZO1X_MEM_COMPRESS, ALLOC_TAG); 797 if (!stream.wrkmem) { 798 ERR("out of memory\n"); 799 ExFreePool(comp_data); 800 return STATUS_INSUFFICIENT_RESOURCES; 801 } 802 803 Status = excise_extents(fcb->Vcb, fcb, start_data, end_data, Irp, rollback); 804 if (!NT_SUCCESS(Status)) { 805 ERR("excise_extents returned %08x\n", Status); 806 ExFreePool(comp_data); 807 ExFreePool(stream.wrkmem); 808 return Status; 809 } 810 811 out_size = (UINT32*)comp_data; 812 *out_size = sizeof(UINT32); 813 814 stream.in = data; 815 stream.out = comp_data + (2 * sizeof(UINT32)); 816 817 for (i = 0; i < num_pages; i++) { 818 UINT32* pagelen = (UINT32*)(stream.out - sizeof(UINT32)); 819 820 stream.inlen = (UINT32)min(LINUX_PAGE_SIZE, end_data - start_data - (i * LINUX_PAGE_SIZE)); 821 822 Status = lzo1x_1_compress(&stream); 823 if (!NT_SUCCESS(Status)) { 824 ERR("lzo1x_1_compress returned %08x\n", Status); 825 skip_compression = TRUE; 826 break; 827 } 828 829 *pagelen = stream.outlen; 830 *out_size += stream.outlen + sizeof(UINT32); 831 832 stream.in += LINUX_PAGE_SIZE; 833 stream.out += stream.outlen + sizeof(UINT32); 834 835 if (LINUX_PAGE_SIZE - (*out_size % LINUX_PAGE_SIZE) < sizeof(UINT32)) { 836 RtlZeroMemory(stream.out, LINUX_PAGE_SIZE - (*out_size % LINUX_PAGE_SIZE)); 837 stream.out += LINUX_PAGE_SIZE - (*out_size % LINUX_PAGE_SIZE); 838 *out_size += LINUX_PAGE_SIZE - (*out_size % LINUX_PAGE_SIZE); 839 } 840 } 841 842 ExFreePool(stream.wrkmem); 843 844 if (skip_compression || *out_size >= end_data - start_data - fcb->Vcb->superblock.sector_size) { // compressed extent would be larger than or same size as uncompressed extent 845 ExFreePool(comp_data); 846 847 comp_length = end_data - start_data; 848 comp_data = data; 849 compression = BTRFS_COMPRESSION_NONE; 850 851 *compressed = FALSE; 852 } else { 853 compression = BTRFS_COMPRESSION_LZO; 854 comp_length = sector_align(*out_size, fcb->Vcb->superblock.sector_size); 855 856 RtlZeroMemory(comp_data + *out_size, (ULONG)(comp_length - *out_size)); 857 858 *compressed = TRUE; 859 } 860 861 ExAcquireResourceSharedLite(&fcb->Vcb->chunk_lock, TRUE); 862 863 le = fcb->Vcb->chunks.Flink; 864 while (le != &fcb->Vcb->chunks) { 865 c = CONTAINING_RECORD(le, chunk, list_entry); 866 867 if (!c->readonly && !c->reloc) { 868 acquire_chunk_lock(c, fcb->Vcb); 869 870 if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) { 871 if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, FALSE, comp_data, Irp, rollback, compression, end_data - start_data, FALSE, 0)) { 872 ExReleaseResourceLite(&fcb->Vcb->chunk_lock); 873 874 if (compression != BTRFS_COMPRESSION_NONE) 875 ExFreePool(comp_data); 876 877 return STATUS_SUCCESS; 878 } 879 } 880 881 release_chunk_lock(c, fcb->Vcb); 882 } 883 884 le = le->Flink; 885 } 886 887 ExReleaseResourceLite(&fcb->Vcb->chunk_lock); 888 889 ExAcquireResourceExclusiveLite(&fcb->Vcb->chunk_lock, TRUE); 890 891 Status = alloc_chunk(fcb->Vcb, fcb->Vcb->data_flags, &c, FALSE); 892 893 ExReleaseResourceLite(&fcb->Vcb->chunk_lock); 894 895 if (!NT_SUCCESS(Status)) { 896 ERR("alloc_chunk returned %08x\n", Status); 897 898 if (compression != BTRFS_COMPRESSION_NONE) 899 ExFreePool(comp_data); 900 901 return Status; 902 } 903 904 if (c) { 905 acquire_chunk_lock(c, fcb->Vcb); 906 907 if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) { 908 if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, FALSE, comp_data, Irp, rollback, compression, end_data - start_data, FALSE, 0)) { 909 if (compression != BTRFS_COMPRESSION_NONE) 910 ExFreePool(comp_data); 911 912 return STATUS_SUCCESS; 913 } 914 } 915 916 release_chunk_lock(c, fcb->Vcb); 917 } 918 919 WARN("couldn't find any data chunks with %llx bytes free\n", comp_length); 920 921 if (compression != BTRFS_COMPRESSION_NONE) 922 ExFreePool(comp_data); 923 924 return STATUS_DISK_FULL; 925 } 926 927 static NTSTATUS zstd_write_compressed_bit(fcb* fcb, UINT64 start_data, UINT64 end_data, void* data, BOOL* compressed, PIRP Irp, LIST_ENTRY* rollback) { 928 NTSTATUS Status; 929 UINT8 compression; 930 UINT32 comp_length; 931 UINT8* comp_data; 932 UINT32 out_left; 933 LIST_ENTRY* le; 934 chunk* c; 935 ZSTD_CStream* stream; 936 size_t init_res, written; 937 ZSTD_inBuffer input; 938 ZSTD_outBuffer output; 939 ZSTD_parameters params; 940 941 comp_data = ExAllocatePoolWithTag(PagedPool, (UINT32)(end_data - start_data), ALLOC_TAG); 942 if (!comp_data) { 943 ERR("out of memory\n"); 944 return STATUS_INSUFFICIENT_RESOURCES; 945 } 946 947 Status = excise_extents(fcb->Vcb, fcb, start_data, end_data, Irp, rollback); 948 if (!NT_SUCCESS(Status)) { 949 ERR("excise_extents returned %08x\n", Status); 950 ExFreePool(comp_data); 951 return Status; 952 } 953 954 stream = ZSTD_createCStream_advanced(zstd_mem); 955 956 if (!stream) { 957 ERR("ZSTD_createCStream failed.\n"); 958 ExFreePool(comp_data); 959 return STATUS_INTERNAL_ERROR; 960 } 961 962 params = ZSTD_getParams(fcb->Vcb->options.zstd_level, (UINT32)(end_data - start_data), 0); 963 964 if (params.cParams.windowLog > ZSTD_BTRFS_MAX_WINDOWLOG) 965 params.cParams.windowLog = ZSTD_BTRFS_MAX_WINDOWLOG; 966 967 init_res = ZSTD_initCStream_advanced(stream, NULL, 0, params, (UINT32)(end_data - start_data)); 968 969 if (ZSTD_isError(init_res)) { 970 ERR("ZSTD_initCStream_advanced failed: %s\n", ZSTD_getErrorName(init_res)); 971 ZSTD_freeCStream(stream); 972 ExFreePool(comp_data); 973 return STATUS_INTERNAL_ERROR; 974 } 975 976 input.src = data; 977 input.size = (UINT32)(end_data - start_data); 978 input.pos = 0; 979 980 output.dst = comp_data; 981 output.size = (UINT32)(end_data - start_data); 982 output.pos = 0; 983 984 while (input.pos < input.size && output.pos < output.size) { 985 written = ZSTD_compressStream(stream, &output, &input); 986 987 if (ZSTD_isError(written)) { 988 ERR("ZSTD_compressStream failed: %s\n", ZSTD_getErrorName(written)); 989 ZSTD_freeCStream(stream); 990 ExFreePool(comp_data); 991 return STATUS_INTERNAL_ERROR; 992 } 993 } 994 995 written = ZSTD_endStream(stream, &output); 996 if (ZSTD_isError(written)) { 997 ERR("ZSTD_endStream failed: %s\n", ZSTD_getErrorName(written)); 998 ZSTD_freeCStream(stream); 999 ExFreePool(comp_data); 1000 return STATUS_INTERNAL_ERROR; 1001 } 1002 1003 ZSTD_freeCStream(stream); 1004 1005 out_left = output.size - output.pos; 1006 1007 if (out_left < fcb->Vcb->superblock.sector_size) { // compressed extent would be larger than or same size as uncompressed extent 1008 ExFreePool(comp_data); 1009 1010 comp_length = (UINT32)(end_data - start_data); 1011 comp_data = data; 1012 compression = BTRFS_COMPRESSION_NONE; 1013 1014 *compressed = FALSE; 1015 } else { 1016 UINT32 cl; 1017 1018 compression = BTRFS_COMPRESSION_ZSTD; 1019 cl = (UINT32)(end_data - start_data - out_left); 1020 comp_length = (UINT32)sector_align(cl, fcb->Vcb->superblock.sector_size); 1021 1022 RtlZeroMemory(comp_data + cl, comp_length - cl); 1023 1024 *compressed = TRUE; 1025 } 1026 1027 ExAcquireResourceSharedLite(&fcb->Vcb->chunk_lock, TRUE); 1028 1029 le = fcb->Vcb->chunks.Flink; 1030 while (le != &fcb->Vcb->chunks) { 1031 c = CONTAINING_RECORD(le, chunk, list_entry); 1032 1033 if (!c->readonly && !c->reloc) { 1034 acquire_chunk_lock(c, fcb->Vcb); 1035 1036 if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) { 1037 if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, FALSE, comp_data, Irp, rollback, compression, end_data - start_data, FALSE, 0)) { 1038 ExReleaseResourceLite(&fcb->Vcb->chunk_lock); 1039 1040 if (compression != BTRFS_COMPRESSION_NONE) 1041 ExFreePool(comp_data); 1042 1043 return STATUS_SUCCESS; 1044 } 1045 } 1046 1047 release_chunk_lock(c, fcb->Vcb); 1048 } 1049 1050 le = le->Flink; 1051 } 1052 1053 ExReleaseResourceLite(&fcb->Vcb->chunk_lock); 1054 1055 ExAcquireResourceExclusiveLite(&fcb->Vcb->chunk_lock, TRUE); 1056 1057 Status = alloc_chunk(fcb->Vcb, fcb->Vcb->data_flags, &c, FALSE); 1058 1059 ExReleaseResourceLite(&fcb->Vcb->chunk_lock); 1060 1061 if (!NT_SUCCESS(Status)) { 1062 ERR("alloc_chunk returned %08x\n", Status); 1063 1064 if (compression != BTRFS_COMPRESSION_NONE) 1065 ExFreePool(comp_data); 1066 1067 return Status; 1068 } 1069 1070 if (c) { 1071 acquire_chunk_lock(c, fcb->Vcb); 1072 1073 if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) { 1074 if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, FALSE, comp_data, Irp, rollback, compression, end_data - start_data, FALSE, 0)) { 1075 if (compression != BTRFS_COMPRESSION_NONE) 1076 ExFreePool(comp_data); 1077 1078 return STATUS_SUCCESS; 1079 } 1080 } 1081 1082 release_chunk_lock(c, fcb->Vcb); 1083 } 1084 1085 WARN("couldn't find any data chunks with %llx bytes free\n", comp_length); 1086 1087 if (compression != BTRFS_COMPRESSION_NONE) 1088 ExFreePool(comp_data); 1089 1090 return STATUS_DISK_FULL; 1091 } 1092 1093 NTSTATUS write_compressed_bit(fcb* fcb, UINT64 start_data, UINT64 end_data, void* data, BOOL* compressed, PIRP Irp, LIST_ENTRY* rollback) { 1094 UINT8 type; 1095 1096 if (fcb->Vcb->options.compress_type != 0 && fcb->prop_compression == PropCompression_None) 1097 type = fcb->Vcb->options.compress_type; 1098 else { 1099 if (!(fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_ZSTD) && fcb->prop_compression == PropCompression_ZSTD) 1100 type = BTRFS_COMPRESSION_ZSTD; 1101 else if (fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_ZSTD && fcb->prop_compression != PropCompression_Zlib && fcb->prop_compression != PropCompression_LZO) 1102 type = BTRFS_COMPRESSION_ZSTD; 1103 else if (!(fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_LZO) && fcb->prop_compression == PropCompression_LZO) 1104 type = BTRFS_COMPRESSION_LZO; 1105 else if (fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_LZO && fcb->prop_compression != PropCompression_Zlib) 1106 type = BTRFS_COMPRESSION_LZO; 1107 else 1108 type = BTRFS_COMPRESSION_ZLIB; 1109 } 1110 1111 if (type == BTRFS_COMPRESSION_ZSTD) { 1112 fcb->Vcb->superblock.incompat_flags |= BTRFS_INCOMPAT_FLAGS_COMPRESS_ZSTD; 1113 return zstd_write_compressed_bit(fcb, start_data, end_data, data, compressed, Irp, rollback); 1114 } else if (type == BTRFS_COMPRESSION_LZO) { 1115 fcb->Vcb->superblock.incompat_flags |= BTRFS_INCOMPAT_FLAGS_COMPRESS_LZO; 1116 return lzo_write_compressed_bit(fcb, start_data, end_data, data, compressed, Irp, rollback); 1117 } else 1118 return zlib_write_compressed_bit(fcb, start_data, end_data, data, compressed, Irp, rollback); 1119 } 1120 1121 static void* zstd_malloc(void* opaque, size_t size) { 1122 UNUSED(opaque); 1123 1124 return ExAllocatePoolWithTag(PagedPool, size, ZSTD_ALLOC_TAG); 1125 } 1126 1127 static void zstd_free(void* opaque, void* address) { 1128 UNUSED(opaque); 1129 1130 ExFreePool(address); 1131 } 1132 1133 NTSTATUS zstd_decompress(UINT8* inbuf, UINT32 inlen, UINT8* outbuf, UINT32 outlen) { 1134 NTSTATUS Status; 1135 ZSTD_DStream* stream; 1136 size_t init_res, read; 1137 ZSTD_inBuffer input; 1138 ZSTD_outBuffer output; 1139 1140 stream = ZSTD_createDStream_advanced(zstd_mem); 1141 1142 if (!stream) { 1143 ERR("ZSTD_createDStream failed.\n"); 1144 return STATUS_INTERNAL_ERROR; 1145 } 1146 1147 init_res = ZSTD_initDStream(stream); 1148 1149 if (ZSTD_isError(init_res)) { 1150 ERR("ZSTD_initDStream failed: %s\n", ZSTD_getErrorName(init_res)); 1151 Status = STATUS_INTERNAL_ERROR; 1152 goto end; 1153 } 1154 1155 input.src = inbuf; 1156 input.size = inlen; 1157 input.pos = 0; 1158 1159 output.dst = outbuf; 1160 output.size = outlen; 1161 output.pos = 0; 1162 1163 read = ZSTD_decompressStream(stream, &output, &input); 1164 1165 if (ZSTD_isError(read)) { 1166 ERR("ZSTD_decompressStream failed: %s\n", ZSTD_getErrorName(read)); 1167 Status = STATUS_INTERNAL_ERROR; 1168 goto end; 1169 } 1170 1171 Status = STATUS_SUCCESS; 1172 1173 end: 1174 ZSTD_freeDStream(stream); 1175 1176 return Status; 1177 } 1178