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 // __REACTOS__ 41 42 #define ZSTD_STATIC_LINKING_ONLY 43 44 #include "zstd/zstd.h" 45 46 #define LZO_PAGE_SIZE 4096 47 48 typedef struct { 49 uint8_t* in; 50 uint32_t inlen; 51 uint32_t inpos; 52 uint8_t* out; 53 uint32_t outlen; 54 uint32_t outpos; 55 bool error; 56 void* wrkmem; 57 } lzo_stream; 58 59 #define LZO1X_MEM_COMPRESS ((uint32_t) (16384L * sizeof(uint8_t*))) 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_t)(p[2]) << shift1) ^ p[1]) << shift2) ^ p[0]) 74 #define DVAL_NEXT(dv, p) dv ^= p[-1]; dv = (((dv) >> 5) ^ ((uint32_t)(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_t*) ip - (uint8_t*) 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_t lzo_nextbyte(lzo_stream* stream) { 104 uint8_t 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_t 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_t byte; 172 uint32_t 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_t)(byte - 17), (uint32_t)(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_t* inbuf, uint32_t inlen, uint8_t* outbuf, uint32_t outlen, uint32_t inpageoff) { 279 NTSTATUS Status; 280 uint32_t partlen, inoff, outoff; 281 lzo_stream stream; 282 283 inoff = 0; 284 outoff = 0; 285 286 do { 287 partlen = *(uint32_t*)&inbuf[inoff]; 288 289 if (partlen + inoff > inlen) { 290 ERR("overflow: %x + %x > %x\n", partlen, inoff, inlen); 291 return STATUS_INTERNAL_ERROR; 292 } 293 294 inoff += sizeof(uint32_t); 295 296 stream.in = &inbuf[inoff]; 297 stream.inlen = partlen; 298 stream.inpos = 0; 299 stream.out = &outbuf[outoff]; 300 stream.outlen = min(outlen, LZO_PAGE_SIZE); 301 stream.outpos = 0; 302 303 Status = do_lzo_decompress(&stream); 304 if (!NT_SUCCESS(Status)) { 305 ERR("do_lzo_decompress returned %08lx\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 (LZO_PAGE_SIZE - ((inpageoff + inoff) % LZO_PAGE_SIZE) < sizeof(uint32_t)) 316 inoff = ((((inpageoff + inoff) / LZO_PAGE_SIZE) + 1) * LZO_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_compress(uint8_t* inbuf, uint32_t inlen, uint8_t* outbuf, uint32_t outlen, unsigned int level, unsigned int* space_left) { 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 = deflateInit(&c_stream, level); 345 346 if (ret != Z_OK) { 347 ERR("deflateInit returned %i\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 = deflate(&c_stream, Z_FINISH); 359 360 if (ret != Z_OK && ret != Z_STREAM_END) { 361 ERR("deflate returned %i\n", ret); 362 deflateEnd(&c_stream); 363 return STATUS_INTERNAL_ERROR; 364 } 365 366 if (c_stream.avail_in == 0 || c_stream.avail_out == 0) 367 break; 368 } while (ret != Z_STREAM_END); 369 370 deflateEnd(&c_stream); 371 372 *space_left = c_stream.avail_in > 0 ? 0 : c_stream.avail_out; 373 374 return STATUS_SUCCESS; 375 } 376 377 NTSTATUS zlib_decompress(uint8_t* inbuf, uint32_t inlen, uint8_t* outbuf, uint32_t outlen) { 378 z_stream c_stream; 379 int ret; 380 381 c_stream.zalloc = zlib_alloc; 382 c_stream.zfree = zlib_free; 383 c_stream.opaque = (voidpf)0; 384 385 ret = inflateInit(&c_stream); 386 387 if (ret != Z_OK) { 388 ERR("inflateInit returned %i\n", ret); 389 return STATUS_INTERNAL_ERROR; 390 } 391 392 c_stream.next_in = inbuf; 393 c_stream.avail_in = inlen; 394 395 c_stream.next_out = outbuf; 396 c_stream.avail_out = outlen; 397 398 do { 399 ret = inflate(&c_stream, Z_NO_FLUSH); 400 401 if (ret != Z_OK && ret != Z_STREAM_END) { 402 ERR("inflate returned %i\n", ret); 403 inflateEnd(&c_stream); 404 return STATUS_INTERNAL_ERROR; 405 } 406 407 if (c_stream.avail_out == 0) 408 break; 409 } while (ret != Z_STREAM_END); 410 411 ret = inflateEnd(&c_stream); 412 413 if (ret != Z_OK) { 414 ERR("inflateEnd returned %i\n", ret); 415 return STATUS_INTERNAL_ERROR; 416 } 417 418 // FIXME - if we're short, should we zero the end of outbuf so we don't leak information into userspace? 419 420 return STATUS_SUCCESS; 421 } 422 423 static NTSTATUS lzo_do_compress(const uint8_t* in, uint32_t in_len, uint8_t* out, uint32_t* out_len, void* wrkmem) { 424 const uint8_t* ip; 425 uint32_t dv; 426 uint8_t* op; 427 const uint8_t* in_end = in + in_len; 428 const uint8_t* ip_end = in + in_len - 9 - 4; 429 const uint8_t* ii; 430 const uint8_t** dict = (const uint8_t**)wrkmem; 431 432 op = out; 433 ip = in; 434 ii = ip; 435 436 DVAL_FIRST(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++; 437 DVAL_NEXT(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++; 438 DVAL_NEXT(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++; 439 DVAL_NEXT(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++; 440 441 while (1) { 442 const uint8_t* m_pos; 443 uint32_t m_len; 444 ptrdiff_t m_off; 445 uint32_t lit, dindex; 446 447 dindex = DINDEX(dv, ip); 448 m_pos = dict[dindex]; 449 UPDATE_I(dict, cycle, dindex, ip); 450 451 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]) { 452 lit = (uint32_t)(ip - ii); 453 m_pos += 3; 454 if (m_off <= M2_MAX_OFFSET) 455 goto match; 456 457 if (lit == 3) { /* better compression, but slower */ 458 if (op - 2 <= out) 459 return STATUS_INTERNAL_ERROR; 460 461 op[-2] |= LZO_BYTE(3); 462 *op++ = *ii++; *op++ = *ii++; *op++ = *ii++; 463 goto code_match; 464 } 465 466 if (*m_pos == ip[3]) 467 goto match; 468 } 469 470 /* a literal */ 471 ++ip; 472 if (ip >= ip_end) 473 break; 474 DVAL_NEXT(dv, ip); 475 continue; 476 477 /* a match */ 478 match: 479 /* store current literal run */ 480 if (lit > 0) { 481 uint32_t t = lit; 482 483 if (t <= 3) { 484 if (op - 2 <= out) 485 return STATUS_INTERNAL_ERROR; 486 487 op[-2] |= LZO_BYTE(t); 488 } else if (t <= 18) 489 *op++ = LZO_BYTE(t - 3); 490 else { 491 uint32_t tt = t - 18; 492 493 *op++ = 0; 494 while (tt > 255) { 495 tt -= 255; 496 *op++ = 0; 497 } 498 499 if (tt <= 0) 500 return STATUS_INTERNAL_ERROR; 501 502 *op++ = LZO_BYTE(tt); 503 } 504 505 do { 506 *op++ = *ii++; 507 } while (--t > 0); 508 } 509 510 511 /* code the match */ 512 code_match: 513 if (ii != ip) 514 return STATUS_INTERNAL_ERROR; 515 516 ip += 3; 517 if (*m_pos++ != *ip++ || *m_pos++ != *ip++ || *m_pos++ != *ip++ || 518 *m_pos++ != *ip++ || *m_pos++ != *ip++ || *m_pos++ != *ip++) { 519 --ip; 520 m_len = (uint32_t)(ip - ii); 521 522 if (m_len < 3 || m_len > 8) 523 return STATUS_INTERNAL_ERROR; 524 525 if (m_off <= M2_MAX_OFFSET) { 526 m_off -= 1; 527 *op++ = LZO_BYTE(((m_len - 1) << 5) | ((m_off & 7) << 2)); 528 *op++ = LZO_BYTE(m_off >> 3); 529 } else if (m_off <= M3_MAX_OFFSET) { 530 m_off -= 1; 531 *op++ = LZO_BYTE(M3_MARKER | (m_len - 2)); 532 goto m3_m4_offset; 533 } else { 534 m_off -= 0x4000; 535 536 if (m_off <= 0 || m_off > 0x7fff) 537 return STATUS_INTERNAL_ERROR; 538 539 *op++ = LZO_BYTE(M4_MARKER | ((m_off & 0x4000) >> 11) | (m_len - 2)); 540 goto m3_m4_offset; 541 } 542 } else { 543 const uint8_t* end; 544 end = in_end; 545 while (ip < end && *m_pos == *ip) 546 m_pos++, ip++; 547 m_len = (uint32_t)(ip - ii); 548 549 if (m_len < 3) 550 return STATUS_INTERNAL_ERROR; 551 552 if (m_off <= M3_MAX_OFFSET) { 553 m_off -= 1; 554 if (m_len <= 33) 555 *op++ = LZO_BYTE(M3_MARKER | (m_len - 2)); 556 else { 557 m_len -= 33; 558 *op++ = M3_MARKER | 0; 559 goto m3_m4_len; 560 } 561 } else { 562 m_off -= 0x4000; 563 564 if (m_off <= 0 || m_off > 0x7fff) 565 return STATUS_INTERNAL_ERROR; 566 567 if (m_len <= 9) 568 *op++ = LZO_BYTE(M4_MARKER | ((m_off & 0x4000) >> 11) | (m_len - 2)); 569 else { 570 m_len -= 9; 571 *op++ = LZO_BYTE(M4_MARKER | ((m_off & 0x4000) >> 11)); 572 m3_m4_len: 573 while (m_len > 255) { 574 m_len -= 255; 575 *op++ = 0; 576 } 577 578 if (m_len <= 0) 579 return STATUS_INTERNAL_ERROR; 580 581 *op++ = LZO_BYTE(m_len); 582 } 583 } 584 585 m3_m4_offset: 586 *op++ = LZO_BYTE((m_off & 63) << 2); 587 *op++ = LZO_BYTE(m_off >> 6); 588 } 589 590 ii = ip; 591 if (ip >= ip_end) 592 break; 593 DVAL_FIRST(dv, ip); 594 } 595 596 /* store final literal run */ 597 if (in_end - ii > 0) { 598 uint32_t t = (uint32_t)(in_end - ii); 599 600 if (op == out && t <= 238) 601 *op++ = LZO_BYTE(17 + t); 602 else if (t <= 3) 603 op[-2] |= LZO_BYTE(t); 604 else if (t <= 18) 605 *op++ = LZO_BYTE(t - 3); 606 else { 607 uint32_t tt = t - 18; 608 609 *op++ = 0; 610 while (tt > 255) { 611 tt -= 255; 612 *op++ = 0; 613 } 614 615 if (tt <= 0) 616 return STATUS_INTERNAL_ERROR; 617 618 *op++ = LZO_BYTE(tt); 619 } 620 621 do { 622 *op++ = *ii++; 623 } while (--t > 0); 624 } 625 626 *out_len = (uint32_t)(op - out); 627 628 return STATUS_SUCCESS; 629 } 630 631 static NTSTATUS lzo1x_1_compress(lzo_stream* stream) { 632 uint8_t *op = stream->out; 633 NTSTATUS Status = STATUS_SUCCESS; 634 635 if (stream->inlen <= 0) 636 stream->outlen = 0; 637 else if (stream->inlen <= 9 + 4) { 638 *op++ = LZO_BYTE(17 + stream->inlen); 639 640 stream->inpos = 0; 641 do { 642 *op++ = stream->in[stream->inpos]; 643 stream->inpos++; 644 } while (stream->inlen < stream->inpos); 645 stream->outlen = (uint32_t)(op - stream->out); 646 } else 647 Status = lzo_do_compress(stream->in, stream->inlen, stream->out, &stream->outlen, stream->wrkmem); 648 649 if (Status == STATUS_SUCCESS) { 650 op = stream->out + stream->outlen; 651 *op++ = M4_MARKER | 1; 652 *op++ = 0; 653 *op++ = 0; 654 stream->outlen += 3; 655 } 656 657 return Status; 658 } 659 660 static __inline uint32_t lzo_max_outlen(uint32_t inlen) { 661 return inlen + (inlen / 16) + 64 + 3; // formula comes from LZO.FAQ 662 } 663 664 static void* zstd_malloc(void* opaque, size_t size) { 665 UNUSED(opaque); 666 667 return ExAllocatePoolWithTag(PagedPool, size, ZSTD_ALLOC_TAG); 668 } 669 670 static void zstd_free(void* opaque, void* address) { 671 UNUSED(opaque); 672 673 ExFreePool(address); 674 } 675 676 NTSTATUS zstd_decompress(uint8_t* inbuf, uint32_t inlen, uint8_t* outbuf, uint32_t outlen) { 677 NTSTATUS Status; 678 ZSTD_DStream* stream; 679 size_t init_res, read; 680 ZSTD_inBuffer input; 681 ZSTD_outBuffer output; 682 683 stream = ZSTD_createDStream_advanced(zstd_mem); 684 685 if (!stream) { 686 ERR("ZSTD_createDStream failed.\n"); 687 return STATUS_INTERNAL_ERROR; 688 } 689 690 init_res = ZSTD_initDStream(stream); 691 692 if (ZSTD_isError(init_res)) { 693 ERR("ZSTD_initDStream failed: %s\n", ZSTD_getErrorName(init_res)); 694 Status = STATUS_INTERNAL_ERROR; 695 goto end; 696 } 697 698 input.src = inbuf; 699 input.size = inlen; 700 input.pos = 0; 701 702 output.dst = outbuf; 703 output.size = outlen; 704 output.pos = 0; 705 706 read = ZSTD_decompressStream(stream, &output, &input); 707 708 if (ZSTD_isError(read)) { 709 ERR("ZSTD_decompressStream failed: %s\n", ZSTD_getErrorName(read)); 710 Status = STATUS_INTERNAL_ERROR; 711 goto end; 712 } 713 714 Status = STATUS_SUCCESS; 715 716 end: 717 ZSTD_freeDStream(stream); 718 719 return Status; 720 } 721 722 NTSTATUS lzo_compress(uint8_t* inbuf, uint32_t inlen, uint8_t* outbuf, uint32_t outlen, unsigned int* space_left) { 723 NTSTATUS Status; 724 unsigned int num_pages; 725 unsigned int comp_data_len; 726 uint8_t* comp_data; 727 lzo_stream stream; 728 uint32_t* out_size; 729 #ifdef __REACTOS__ 730 unsigned int i; 731 #endif // __REACTOS__ 732 733 num_pages = (unsigned int)sector_align(inlen, LZO_PAGE_SIZE) / LZO_PAGE_SIZE; 734 735 // Four-byte overall header 736 // Another four-byte header page 737 // Each page has a maximum size of lzo_max_outlen(LZO_PAGE_SIZE) 738 // Plus another four bytes for possible padding 739 comp_data_len = sizeof(uint32_t) + ((lzo_max_outlen(LZO_PAGE_SIZE) + (2 * sizeof(uint32_t))) * num_pages); 740 741 // FIXME - can we write this so comp_data isn't necessary? 742 743 comp_data = ExAllocatePoolWithTag(PagedPool, comp_data_len, ALLOC_TAG); 744 if (!comp_data) { 745 ERR("out of memory\n"); 746 return STATUS_INSUFFICIENT_RESOURCES; 747 } 748 749 stream.wrkmem = ExAllocatePoolWithTag(PagedPool, LZO1X_MEM_COMPRESS, ALLOC_TAG); 750 if (!stream.wrkmem) { 751 ERR("out of memory\n"); 752 ExFreePool(comp_data); 753 return STATUS_INSUFFICIENT_RESOURCES; 754 } 755 756 out_size = (uint32_t*)comp_data; 757 *out_size = sizeof(uint32_t); 758 759 stream.in = inbuf; 760 stream.out = comp_data + (2 * sizeof(uint32_t)); 761 762 #ifndef __REACTOS__ 763 for (unsigned int i = 0; i < num_pages; i++) { 764 #else 765 for (i = 0; i < num_pages; i++) { 766 #endif // __REACTOS__ 767 uint32_t* pagelen = (uint32_t*)(stream.out - sizeof(uint32_t)); 768 769 stream.inlen = (uint32_t)min(LZO_PAGE_SIZE, outlen - (i * LZO_PAGE_SIZE)); 770 771 Status = lzo1x_1_compress(&stream); 772 if (!NT_SUCCESS(Status)) { 773 ERR("lzo1x_1_compress returned %08lx\n", Status); 774 ExFreePool(comp_data); 775 return Status; 776 } 777 778 *pagelen = stream.outlen; 779 *out_size += stream.outlen + sizeof(uint32_t); 780 781 stream.in += LZO_PAGE_SIZE; 782 stream.out += stream.outlen + sizeof(uint32_t); 783 784 // new page needs to start at a 32-bit boundary 785 if (LZO_PAGE_SIZE - (*out_size % LZO_PAGE_SIZE) < sizeof(uint32_t)) { 786 RtlZeroMemory(stream.out, LZO_PAGE_SIZE - (*out_size % LZO_PAGE_SIZE)); 787 stream.out += LZO_PAGE_SIZE - (*out_size % LZO_PAGE_SIZE); 788 *out_size += LZO_PAGE_SIZE - (*out_size % LZO_PAGE_SIZE); 789 } 790 } 791 792 ExFreePool(stream.wrkmem); 793 794 if (*out_size >= outlen) 795 *space_left = 0; 796 else { 797 *space_left = outlen - *out_size; 798 799 RtlCopyMemory(outbuf, comp_data, *out_size); 800 } 801 802 ExFreePool(comp_data); 803 804 return STATUS_SUCCESS; 805 } 806 807 NTSTATUS zstd_compress(uint8_t* inbuf, uint32_t inlen, uint8_t* outbuf, uint32_t outlen, uint32_t level, unsigned int* space_left) { 808 ZSTD_CStream* stream; 809 size_t init_res, written; 810 ZSTD_inBuffer input; 811 ZSTD_outBuffer output; 812 ZSTD_parameters params; 813 814 stream = ZSTD_createCStream_advanced(zstd_mem); 815 816 if (!stream) { 817 ERR("ZSTD_createCStream failed.\n"); 818 return STATUS_INTERNAL_ERROR; 819 } 820 821 params = ZSTD_getParams(level, inlen, 0); 822 823 if (params.cParams.windowLog > ZSTD_BTRFS_MAX_WINDOWLOG) 824 params.cParams.windowLog = ZSTD_BTRFS_MAX_WINDOWLOG; 825 826 init_res = ZSTD_initCStream_advanced(stream, NULL, 0, params, inlen); 827 828 if (ZSTD_isError(init_res)) { 829 ERR("ZSTD_initCStream_advanced failed: %s\n", ZSTD_getErrorName(init_res)); 830 ZSTD_freeCStream(stream); 831 return STATUS_INTERNAL_ERROR; 832 } 833 834 input.src = inbuf; 835 input.size = inlen; 836 input.pos = 0; 837 838 output.dst = outbuf; 839 output.size = outlen; 840 output.pos = 0; 841 842 while (input.pos < input.size && output.pos < output.size) { 843 written = ZSTD_compressStream(stream, &output, &input); 844 845 if (ZSTD_isError(written)) { 846 ERR("ZSTD_compressStream failed: %s\n", ZSTD_getErrorName(written)); 847 ZSTD_freeCStream(stream); 848 return STATUS_INTERNAL_ERROR; 849 } 850 } 851 852 written = ZSTD_endStream(stream, &output); 853 if (ZSTD_isError(written)) { 854 ERR("ZSTD_endStream failed: %s\n", ZSTD_getErrorName(written)); 855 ZSTD_freeCStream(stream); 856 return STATUS_INTERNAL_ERROR; 857 } 858 859 ZSTD_freeCStream(stream); 860 861 if (input.pos < input.size) // output would be larger than input 862 *space_left = 0; 863 else 864 *space_left = output.size - output.pos; 865 866 return STATUS_SUCCESS; 867 } 868 869 typedef struct { 870 uint8_t buf[COMPRESSED_EXTENT_SIZE]; 871 uint8_t compression_type; 872 unsigned int inlen; 873 unsigned int outlen; 874 calc_job* cj; 875 } comp_part; 876 877 NTSTATUS write_compressed(fcb* fcb, uint64_t start_data, uint64_t end_data, void* data, PIRP Irp, LIST_ENTRY* rollback) { 878 NTSTATUS Status; 879 uint64_t i; 880 unsigned int num_parts = (unsigned int)sector_align(end_data - start_data, COMPRESSED_EXTENT_SIZE) / COMPRESSED_EXTENT_SIZE; 881 uint8_t type; 882 comp_part* parts; 883 unsigned int buflen = 0; 884 uint8_t* buf; 885 chunk* c = NULL; 886 LIST_ENTRY* le; 887 uint64_t address, extaddr; 888 void* csum = NULL; 889 #ifdef __REACTOS__ 890 int32_t i2; 891 uint32_t i3, j; 892 #endif // __REACTOS__ 893 894 if (fcb->Vcb->options.compress_type != 0 && fcb->prop_compression == PropCompression_None) 895 type = fcb->Vcb->options.compress_type; 896 else { 897 if (!(fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_ZSTD) && fcb->prop_compression == PropCompression_ZSTD) 898 type = BTRFS_COMPRESSION_ZSTD; 899 else if (fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_ZSTD && fcb->prop_compression != PropCompression_Zlib && fcb->prop_compression != PropCompression_LZO) 900 type = BTRFS_COMPRESSION_ZSTD; 901 else if (!(fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_LZO) && fcb->prop_compression == PropCompression_LZO) 902 type = BTRFS_COMPRESSION_LZO; 903 else if (fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_LZO && fcb->prop_compression != PropCompression_Zlib) 904 type = BTRFS_COMPRESSION_LZO; 905 else 906 type = BTRFS_COMPRESSION_ZLIB; 907 } 908 909 Status = excise_extents(fcb->Vcb, fcb, start_data, end_data, Irp, rollback); 910 if (!NT_SUCCESS(Status)) { 911 ERR("excise_extents returned %08lx\n", Status); 912 return Status; 913 } 914 915 parts = ExAllocatePoolWithTag(PagedPool, sizeof(comp_part) * num_parts, ALLOC_TAG); 916 if (!parts) { 917 ERR("out of memory\n"); 918 return STATUS_INSUFFICIENT_RESOURCES; 919 } 920 921 for (i = 0; i < num_parts; i++) { 922 if (i == num_parts - 1) 923 parts[i].inlen = ((unsigned int)(end_data - start_data) - ((num_parts - 1) * COMPRESSED_EXTENT_SIZE)); 924 else 925 parts[i].inlen = COMPRESSED_EXTENT_SIZE; 926 927 Status = add_calc_job_comp(fcb->Vcb, type, (uint8_t*)data + (i * COMPRESSED_EXTENT_SIZE), parts[i].inlen, 928 parts[i].buf, parts[i].inlen, &parts[i].cj); 929 if (!NT_SUCCESS(Status)) { 930 ERR("add_calc_job_comp returned %08lx\n", Status); 931 932 #ifndef __REACTOS__ 933 for (unsigned int j = 0; j < i; j++) { 934 #else 935 for (j = 0; j < i; j++) { 936 #endif // __REACTOS__ 937 KeWaitForSingleObject(&parts[j].cj->event, Executive, KernelMode, false, NULL); 938 ExFreePool(parts[j].cj); 939 } 940 941 ExFreePool(parts); 942 return Status; 943 } 944 } 945 946 Status = STATUS_SUCCESS; 947 948 #ifndef __REACTOS__ 949 for (int i = num_parts - 1; i >= 0; i--) { 950 calc_thread_main(fcb->Vcb, parts[i].cj); 951 952 KeWaitForSingleObject(&parts[i].cj->event, Executive, KernelMode, false, NULL); 953 954 if (!NT_SUCCESS(parts[i].cj->Status)) 955 Status = parts[i].cj->Status; 956 } 957 #else 958 for (i2 = num_parts - 1; i2 >= 0; i2--) { 959 calc_thread_main(fcb->Vcb, parts[i].cj); 960 961 KeWaitForSingleObject(&parts[i2].cj->event, Executive, KernelMode, false, NULL); 962 963 if (!NT_SUCCESS(parts[i2].cj->Status)) 964 Status = parts[i2].cj->Status; 965 } 966 #endif // __REACTOS__ 967 968 if (!NT_SUCCESS(Status)) { 969 ERR("calc job returned %08lx\n", Status); 970 971 #ifndef __REACTOS__ 972 for (unsigned int i = 0; i < num_parts; i++) { 973 ExFreePool(parts[i].cj); 974 } 975 #else 976 for (i3 = 0; i3 < num_parts; i3++) { 977 ExFreePool(parts[i3].cj); 978 } 979 #endif // __REACTOS__ 980 981 ExFreePool(parts); 982 return Status; 983 } 984 985 #ifndef __REACTOS__ 986 for (unsigned int i = 0; i < num_parts; i++) { 987 if (parts[i].cj->space_left >= fcb->Vcb->superblock.sector_size) { 988 parts[i].compression_type = type; 989 parts[i].outlen = parts[i].inlen - parts[i].cj->space_left; 990 991 if (type == BTRFS_COMPRESSION_LZO) 992 fcb->Vcb->superblock.incompat_flags |= BTRFS_INCOMPAT_FLAGS_COMPRESS_LZO; 993 else if (type == BTRFS_COMPRESSION_ZSTD) 994 fcb->Vcb->superblock.incompat_flags |= BTRFS_INCOMPAT_FLAGS_COMPRESS_ZSTD; 995 996 if ((parts[i].outlen % fcb->Vcb->superblock.sector_size) != 0) { 997 unsigned int newlen = (unsigned int)sector_align(parts[i].outlen, fcb->Vcb->superblock.sector_size); 998 999 RtlZeroMemory(parts[i].buf + parts[i].outlen, newlen - parts[i].outlen); 1000 1001 parts[i].outlen = newlen; 1002 } 1003 } else { 1004 parts[i].compression_type = BTRFS_COMPRESSION_NONE; 1005 parts[i].outlen = (unsigned int)sector_align(parts[i].inlen, fcb->Vcb->superblock.sector_size); 1006 } 1007 1008 buflen += parts[i].outlen; 1009 ExFreePool(parts[i].cj); 1010 } 1011 #else 1012 for (i3 = 0; i3 < num_parts; i3++) { 1013 if (parts[i3].cj->space_left >= fcb->Vcb->superblock.sector_size) { 1014 parts[i3].compression_type = type; 1015 parts[i3].outlen = parts[i3].inlen - parts[i3].cj->space_left; 1016 1017 if (type == BTRFS_COMPRESSION_LZO) 1018 fcb->Vcb->superblock.incompat_flags |= BTRFS_INCOMPAT_FLAGS_COMPRESS_LZO; 1019 else if (type == BTRFS_COMPRESSION_ZSTD) 1020 fcb->Vcb->superblock.incompat_flags |= BTRFS_INCOMPAT_FLAGS_COMPRESS_ZSTD; 1021 1022 if ((parts[i3].outlen % fcb->Vcb->superblock.sector_size) != 0) { 1023 unsigned int newlen = (unsigned int)sector_align(parts[i3].outlen, fcb->Vcb->superblock.sector_size); 1024 1025 RtlZeroMemory(parts[i3].buf + parts[i3].outlen, newlen - parts[i3].outlen); 1026 1027 parts[i3].outlen = newlen; 1028 } 1029 } else { 1030 parts[i3].compression_type = BTRFS_COMPRESSION_NONE; 1031 parts[i3].outlen = (unsigned int)sector_align(parts[i3].inlen, fcb->Vcb->superblock.sector_size); 1032 } 1033 1034 buflen += parts[i3].outlen; 1035 ExFreePool(parts[i3].cj); 1036 } 1037 #endif // __REACTOS__ 1038 1039 // check if first 128 KB of file is incompressible 1040 1041 if (start_data == 0 && parts[0].compression_type == BTRFS_COMPRESSION_NONE && !fcb->Vcb->options.compress_force) { 1042 TRACE("adding nocompress flag to subvol %I64x, inode %I64x\n", fcb->subvol->id, fcb->inode); 1043 1044 fcb->inode_item.flags |= BTRFS_INODE_NOCOMPRESS; 1045 fcb->inode_item_changed = true; 1046 mark_fcb_dirty(fcb); 1047 } 1048 1049 // join together into continuous buffer 1050 1051 buf = ExAllocatePoolWithTag(PagedPool, buflen, ALLOC_TAG); 1052 if (!buf) { 1053 ERR("out of memory\n"); 1054 ExFreePool(parts); 1055 return STATUS_INSUFFICIENT_RESOURCES; 1056 } 1057 1058 { 1059 uint8_t* buf2 = buf; 1060 1061 for (i = 0; i < num_parts; i++) { 1062 if (parts[i].compression_type == BTRFS_COMPRESSION_NONE) 1063 RtlCopyMemory(buf2, (uint8_t*)data + (i * COMPRESSED_EXTENT_SIZE), parts[i].outlen); 1064 else 1065 RtlCopyMemory(buf2, parts[i].buf, parts[i].outlen); 1066 1067 buf2 += parts[i].outlen; 1068 } 1069 } 1070 1071 // find an address 1072 1073 ExAcquireResourceSharedLite(&fcb->Vcb->chunk_lock, true); 1074 1075 le = fcb->Vcb->chunks.Flink; 1076 while (le != &fcb->Vcb->chunks) { 1077 chunk* c2 = CONTAINING_RECORD(le, chunk, list_entry); 1078 1079 if (!c2->readonly && !c2->reloc) { 1080 acquire_chunk_lock(c2, fcb->Vcb); 1081 1082 if (c2->chunk_item->type == fcb->Vcb->data_flags && (c2->chunk_item->size - c2->used) >= buflen) { 1083 if (find_data_address_in_chunk(fcb->Vcb, c2, buflen, &address)) { 1084 c = c2; 1085 c->used += buflen; 1086 space_list_subtract(c, false, address, buflen, rollback); 1087 release_chunk_lock(c2, fcb->Vcb); 1088 break; 1089 } 1090 } 1091 1092 release_chunk_lock(c2, fcb->Vcb); 1093 } 1094 1095 le = le->Flink; 1096 } 1097 1098 ExReleaseResourceLite(&fcb->Vcb->chunk_lock); 1099 1100 if (!c) { 1101 chunk* c2; 1102 1103 ExAcquireResourceExclusiveLite(&fcb->Vcb->chunk_lock, true); 1104 1105 Status = alloc_chunk(fcb->Vcb, fcb->Vcb->data_flags, &c2, false); 1106 1107 ExReleaseResourceLite(&fcb->Vcb->chunk_lock); 1108 1109 if (!NT_SUCCESS(Status)) { 1110 ERR("alloc_chunk returned %08lx\n", Status); 1111 ExFreePool(buf); 1112 ExFreePool(parts); 1113 return Status; 1114 } 1115 1116 acquire_chunk_lock(c2, fcb->Vcb); 1117 1118 if (find_data_address_in_chunk(fcb->Vcb, c2, buflen, &address)) { 1119 c = c2; 1120 c->used += buflen; 1121 space_list_subtract(c, false, address, buflen, rollback); 1122 } 1123 1124 release_chunk_lock(c2, fcb->Vcb); 1125 } 1126 1127 if (!c) { 1128 WARN("couldn't find any data chunks with %x bytes free\n", buflen); 1129 ExFreePool(buf); 1130 ExFreePool(parts); 1131 return STATUS_DISK_FULL; 1132 } 1133 1134 // write to disk 1135 1136 TRACE("writing %x bytes to %I64x\n", buflen, address); 1137 1138 Status = write_data_complete(fcb->Vcb, address, buf, buflen, Irp, NULL, false, 0, 1139 fcb->Header.Flags2 & FSRTL_FLAG2_IS_PAGING_FILE ? HighPagePriority : NormalPagePriority); 1140 if (!NT_SUCCESS(Status)) { 1141 ERR("write_data_complete returned %08lx\n", Status); 1142 ExFreePool(buf); 1143 ExFreePool(parts); 1144 return Status; 1145 } 1146 1147 // FIXME - do rest of the function while we're waiting for I/O to finish? 1148 1149 // calculate csums if necessary 1150 1151 if (!(fcb->inode_item.flags & BTRFS_INODE_NODATASUM)) { 1152 unsigned int sl = buflen / fcb->Vcb->superblock.sector_size; 1153 1154 csum = ExAllocatePoolWithTag(PagedPool, sl * fcb->Vcb->csum_size, ALLOC_TAG); 1155 if (!csum) { 1156 ERR("out of memory\n"); 1157 ExFreePool(buf); 1158 ExFreePool(parts); 1159 return STATUS_INSUFFICIENT_RESOURCES; 1160 } 1161 1162 do_calc_job(fcb->Vcb, buf, sl, csum); 1163 } 1164 1165 ExFreePool(buf); 1166 1167 // add extents to fcb 1168 1169 extaddr = address; 1170 1171 for (i = 0; i < num_parts; i++) { 1172 EXTENT_DATA* ed; 1173 EXTENT_DATA2* ed2; 1174 void* csum2; 1175 1176 ed = ExAllocatePoolWithTag(PagedPool, offsetof(EXTENT_DATA, data[0]) + sizeof(EXTENT_DATA2), ALLOC_TAG); 1177 if (!ed) { 1178 ERR("out of memory\n"); 1179 ExFreePool(parts); 1180 1181 if (csum) 1182 ExFreePool(csum); 1183 1184 return STATUS_INSUFFICIENT_RESOURCES; 1185 } 1186 1187 ed->generation = fcb->Vcb->superblock.generation; 1188 ed->decoded_size = parts[i].inlen; 1189 ed->compression = parts[i].compression_type; 1190 ed->encryption = BTRFS_ENCRYPTION_NONE; 1191 ed->encoding = BTRFS_ENCODING_NONE; 1192 ed->type = EXTENT_TYPE_REGULAR; 1193 1194 ed2 = (EXTENT_DATA2*)ed->data; 1195 ed2->address = extaddr; 1196 ed2->size = parts[i].outlen; 1197 ed2->offset = 0; 1198 ed2->num_bytes = parts[i].inlen; 1199 1200 if (csum) { 1201 csum2 = ExAllocatePoolWithTag(PagedPool, parts[i].outlen * fcb->Vcb->csum_size / fcb->Vcb->superblock.sector_size, ALLOC_TAG); 1202 if (!csum2) { 1203 ERR("out of memory\n"); 1204 ExFreePool(ed); 1205 ExFreePool(parts); 1206 ExFreePool(csum); 1207 return STATUS_INSUFFICIENT_RESOURCES; 1208 } 1209 1210 RtlCopyMemory(csum2, (uint8_t*)csum + ((extaddr - address) * fcb->Vcb->csum_size / fcb->Vcb->superblock.sector_size), 1211 parts[i].outlen * fcb->Vcb->csum_size / fcb->Vcb->superblock.sector_size); 1212 } else 1213 csum2 = NULL; 1214 1215 Status = add_extent_to_fcb(fcb, start_data + (i * COMPRESSED_EXTENT_SIZE), ed, offsetof(EXTENT_DATA, data[0]) + sizeof(EXTENT_DATA2), 1216 true, csum2, rollback); 1217 if (!NT_SUCCESS(Status)) { 1218 ERR("add_extent_to_fcb returned %08lx\n", Status); 1219 ExFreePool(ed); 1220 ExFreePool(parts); 1221 1222 if (csum) 1223 ExFreePool(csum); 1224 1225 return Status; 1226 } 1227 1228 ExFreePool(ed); 1229 1230 fcb->inode_item.st_blocks += parts[i].inlen; 1231 1232 extaddr += parts[i].outlen; 1233 } 1234 1235 if (csum) 1236 ExFreePool(csum); 1237 1238 // update extent refcounts 1239 1240 ExAcquireResourceExclusiveLite(&c->changed_extents_lock, true); 1241 1242 extaddr = address; 1243 1244 for (i = 0; i < num_parts; i++) { 1245 add_changed_extent_ref(c, extaddr, parts[i].outlen, fcb->subvol->id, fcb->inode, 1246 start_data + (i * COMPRESSED_EXTENT_SIZE), 1, fcb->inode_item.flags & BTRFS_INODE_NODATASUM); 1247 1248 extaddr += parts[i].outlen; 1249 } 1250 1251 ExReleaseResourceLite(&c->changed_extents_lock); 1252 1253 fcb->extents_changed = true; 1254 fcb->inode_item_changed = true; 1255 mark_fcb_dirty(fcb); 1256 1257 ExFreePool(parts); 1258 1259 return STATUS_SUCCESS; 1260 } 1261