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reactos/drivers/filesystems/btrfs/compress.c
Pierre Schweitzer 318da0c18c
[BTRFS] Upgrade to 1.4 
CORE-16354
2019-09-02 08:19:48 +02:00

1177 lines
35 KiB
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/* Copyright (c) Mark Harmstone 2016-17
* Copyright (c) Reimar Doeffinger 2006
* Copyright (c) Markus Oberhumer 1996
*
* This file is part of WinBtrfs.
*
* WinBtrfs is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public Licence as published by
* the Free Software Foundation, either version 3 of the Licence, or
* (at your option) any later version.
*
* WinBtrfs is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public Licence for more details.
*
* You should have received a copy of the GNU Lesser General Public Licence
* along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */
// Portions of the LZO decompression code here were cribbed from code in
// libavcodec, also under the LGPL. Thank you, Reimar Doeffinger.
// The LZO compression code comes from v0.22 of lzo, written way back in
// 1996, and available here:
// https://www.ibiblio.org/pub/historic-linux/ftp-archives/sunsite.unc.edu/Sep-29-1996/libs/lzo-0.22.tar.gz
// Modern versions of lzo are licensed under the GPL, but the very oldest
// versions are under the LGPL and hence okay to use here.
#include "btrfs_drv.h"
#define Z_SOLO
#define ZLIB_INTERNAL
#ifndef __REACTOS__
#include "zlib/zlib.h"
#include "zlib/inftrees.h"
#include "zlib/inflate.h"
#else
#include <zlib.h>
#endif
#define ZSTD_STATIC_LINKING_ONLY
#include "zstd/zstd.h"
#define LZO_PAGE_SIZE 4096
typedef struct {
uint8_t* in;
uint32_t inlen;
uint32_t inpos;
uint8_t* out;
uint32_t outlen;
uint32_t outpos;
bool error;
void* wrkmem;
} lzo_stream;
#define LZO1X_MEM_COMPRESS ((uint32_t) (16384L * sizeof(uint8_t*)))
#define M1_MAX_OFFSET 0x0400
#define M2_MAX_OFFSET 0x0800
#define M3_MAX_OFFSET 0x4000
#define M4_MAX_OFFSET 0xbfff
#define MX_MAX_OFFSET (M1_MAX_OFFSET + M2_MAX_OFFSET)
#define M1_MARKER 0
#define M2_MARKER 64
#define M3_MARKER 32
#define M4_MARKER 16
#define _DV2(p, shift1, shift2) (((( (uint32_t)(p[2]) << shift1) ^ p[1]) << shift2) ^ p[0])
#define DVAL_NEXT(dv, p) dv ^= p[-1]; dv = (((dv) >> 5) ^ ((uint32_t)(p[2]) << (2*5)))
#define _DV(p, shift) _DV2(p, shift, shift)
#define DVAL_FIRST(dv, p) dv = _DV((p), 5)
#define _DINDEX(dv, p) ((40799u * (dv)) >> 5)
#define DINDEX(dv, p) (((_DINDEX(dv, p)) & 0x3fff) << 0)
#define UPDATE_D(dict, cycle, dv, p) dict[DINDEX(dv, p)] = (p)
#define UPDATE_I(dict, cycle, index, p) dict[index] = (p)
#define LZO_CHECK_MPOS_NON_DET(m_pos, m_off, in, ip, max_offset) \
((void*) m_pos < (void*) in || \
(m_off = (uint8_t*) ip - (uint8_t*) m_pos) <= 0 || \
m_off > max_offset)
#define LZO_BYTE(x) ((unsigned char) (x))
#define ZSTD_ALLOC_TAG 0x6474737a // "zstd"
// needs to be the same as Linux (fs/btrfs/zstd.c)
#define ZSTD_BTRFS_MAX_WINDOWLOG 17
static void* zstd_malloc(void* opaque, size_t size);
static void zstd_free(void* opaque, void* address);
#ifndef __REACTOS__
ZSTD_customMem zstd_mem = { .customAlloc = zstd_malloc, .customFree = zstd_free, .opaque = NULL };
#else
ZSTD_customMem zstd_mem = { zstd_malloc, zstd_free, NULL };
#endif
static uint8_t lzo_nextbyte(lzo_stream* stream) {
uint8_t c;
if (stream->inpos >= stream->inlen) {
stream->error = true;
return 0;
}
c = stream->in[stream->inpos];
stream->inpos++;
return c;
}
static int lzo_len(lzo_stream* stream, int byte, int mask) {
int len = byte & mask;
if (len == 0) {
while (!(byte = lzo_nextbyte(stream))) {
if (stream->error) return 0;
len += 255;
}
len += mask + byte;
}
return len;
}
static void lzo_copy(lzo_stream* stream, int len) {
if (stream->inpos + len > stream->inlen) {
stream->error = true;
return;
}
if (stream->outpos + len > stream->outlen) {
stream->error = true;
return;
}
do {
stream->out[stream->outpos] = stream->in[stream->inpos];
stream->inpos++;
stream->outpos++;
len--;
} while (len > 0);
}
static void lzo_copyback(lzo_stream* stream, uint32_t back, int len) {
if (stream->outpos < back) {
stream->error = true;
return;
}
if (stream->outpos + len > stream->outlen) {
stream->error = true;
return;
}
do {
stream->out[stream->outpos] = stream->out[stream->outpos - back];
stream->outpos++;
len--;
} while (len > 0);
}
static NTSTATUS do_lzo_decompress(lzo_stream* stream) {
uint8_t byte;
uint32_t len, back;
bool backcopy = false;
stream->error = false;
byte = lzo_nextbyte(stream);
if (stream->error) return STATUS_INTERNAL_ERROR;
if (byte > 17) {
lzo_copy(stream, min((uint8_t)(byte - 17), (uint32_t)(stream->outlen - stream->outpos)));
if (stream->error) return STATUS_INTERNAL_ERROR;
if (stream->outlen == stream->outpos)
return STATUS_SUCCESS;
byte = lzo_nextbyte(stream);
if (stream->error) return STATUS_INTERNAL_ERROR;
if (byte < 16) return STATUS_INTERNAL_ERROR;
}
while (1) {
if (byte >> 4) {
backcopy = true;
if (byte >> 6) {
len = (byte >> 5) - 1;
back = (lzo_nextbyte(stream) << 3) + ((byte >> 2) & 7) + 1;
if (stream->error) return STATUS_INTERNAL_ERROR;
} else if (byte >> 5) {
len = lzo_len(stream, byte, 31);
if (stream->error) return STATUS_INTERNAL_ERROR;
byte = lzo_nextbyte(stream);
if (stream->error) return STATUS_INTERNAL_ERROR;
back = (lzo_nextbyte(stream) << 6) + (byte >> 2) + 1;
if (stream->error) return STATUS_INTERNAL_ERROR;
} else {
len = lzo_len(stream, byte, 7);
if (stream->error) return STATUS_INTERNAL_ERROR;
back = (1 << 14) + ((byte & 8) << 11);
byte = lzo_nextbyte(stream);
if (stream->error) return STATUS_INTERNAL_ERROR;
back += (lzo_nextbyte(stream) << 6) + (byte >> 2);
if (stream->error) return STATUS_INTERNAL_ERROR;
if (back == (1 << 14)) {
if (len != 1)
return STATUS_INTERNAL_ERROR;
break;
}
}
} else if (backcopy) {
len = 0;
back = (lzo_nextbyte(stream) << 2) + (byte >> 2) + 1;
if (stream->error) return STATUS_INTERNAL_ERROR;
} else {
len = lzo_len(stream, byte, 15);
if (stream->error) return STATUS_INTERNAL_ERROR;
lzo_copy(stream, min(len + 3, stream->outlen - stream->outpos));
if (stream->error) return STATUS_INTERNAL_ERROR;
if (stream->outlen == stream->outpos)
return STATUS_SUCCESS;
byte = lzo_nextbyte(stream);
if (stream->error) return STATUS_INTERNAL_ERROR;
if (byte >> 4)
continue;
len = 1;
back = (1 << 11) + (lzo_nextbyte(stream) << 2) + (byte >> 2) + 1;
if (stream->error) return STATUS_INTERNAL_ERROR;
break;
}
lzo_copyback(stream, back, min(len + 2, stream->outlen - stream->outpos));
if (stream->error) return STATUS_INTERNAL_ERROR;
if (stream->outlen == stream->outpos)
return STATUS_SUCCESS;
len = byte & 3;
if (len) {
lzo_copy(stream, min(len, stream->outlen - stream->outpos));
if (stream->error) return STATUS_INTERNAL_ERROR;
if (stream->outlen == stream->outpos)
return STATUS_SUCCESS;
} else
backcopy = !backcopy;
byte = lzo_nextbyte(stream);
if (stream->error) return STATUS_INTERNAL_ERROR;
}
return STATUS_SUCCESS;
}
NTSTATUS lzo_decompress(uint8_t* inbuf, uint32_t inlen, uint8_t* outbuf, uint32_t outlen, uint32_t inpageoff) {
NTSTATUS Status;
uint32_t partlen, inoff, outoff;
lzo_stream stream;
inoff = 0;
outoff = 0;
do {
partlen = *(uint32_t*)&inbuf[inoff];
if (partlen + inoff > inlen) {
ERR("overflow: %x + %x > %I64x\n", partlen, inoff, inlen);
return STATUS_INTERNAL_ERROR;
}
inoff += sizeof(uint32_t);
stream.in = &inbuf[inoff];
stream.inlen = partlen;
stream.inpos = 0;
stream.out = &outbuf[outoff];
stream.outlen = min(outlen, LZO_PAGE_SIZE);
stream.outpos = 0;
Status = do_lzo_decompress(&stream);
if (!NT_SUCCESS(Status)) {
ERR("do_lzo_decompress returned %08x\n", Status);
return Status;
}
if (stream.outpos < stream.outlen)
RtlZeroMemory(&stream.out[stream.outpos], stream.outlen - stream.outpos);
inoff += partlen;
outoff += stream.outlen;
if (LZO_PAGE_SIZE - ((inpageoff + inoff) % LZO_PAGE_SIZE) < sizeof(uint32_t))
inoff = ((((inpageoff + inoff) / LZO_PAGE_SIZE) + 1) * LZO_PAGE_SIZE) - inpageoff;
outlen -= stream.outlen;
} while (inoff < inlen && outlen > 0);
return STATUS_SUCCESS;
}
static void* zlib_alloc(void* opaque, unsigned int items, unsigned int size) {
UNUSED(opaque);
return ExAllocatePoolWithTag(PagedPool, items * size, ALLOC_TAG_ZLIB);
}
static void zlib_free(void* opaque, void* ptr) {
UNUSED(opaque);
ExFreePool(ptr);
}
NTSTATUS zlib_decompress(uint8_t* inbuf, uint32_t inlen, uint8_t* outbuf, uint32_t outlen) {
z_stream c_stream;
int ret;
c_stream.zalloc = zlib_alloc;
c_stream.zfree = zlib_free;
c_stream.opaque = (voidpf)0;
ret = inflateInit(&c_stream);
if (ret != Z_OK) {
ERR("inflateInit returned %08x\n", ret);
return STATUS_INTERNAL_ERROR;
}
c_stream.next_in = inbuf;
c_stream.avail_in = inlen;
c_stream.next_out = outbuf;
c_stream.avail_out = outlen;
do {
ret = inflate(&c_stream, Z_NO_FLUSH);
if (ret != Z_OK && ret != Z_STREAM_END) {
ERR("inflate returned %08x\n", ret);
inflateEnd(&c_stream);
return STATUS_INTERNAL_ERROR;
}
if (c_stream.avail_out == 0)
break;
} while (ret != Z_STREAM_END);
ret = inflateEnd(&c_stream);
if (ret != Z_OK) {
ERR("inflateEnd returned %08x\n", ret);
return STATUS_INTERNAL_ERROR;
}
// FIXME - if we're short, should we zero the end of outbuf so we don't leak information into userspace?
return STATUS_SUCCESS;
}
static NTSTATUS zlib_write_compressed_bit(fcb* fcb, uint64_t start_data, uint64_t end_data, void* data, bool* compressed, PIRP Irp, LIST_ENTRY* rollback) {
NTSTATUS Status;
uint8_t compression;
uint32_t comp_length;
uint8_t* comp_data;
uint32_t out_left;
LIST_ENTRY* le;
chunk* c;
z_stream c_stream;
int ret;
comp_data = ExAllocatePoolWithTag(PagedPool, (uint32_t)(end_data - start_data), ALLOC_TAG);
if (!comp_data) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = excise_extents(fcb->Vcb, fcb, start_data, end_data, Irp, rollback);
if (!NT_SUCCESS(Status)) {
ERR("excise_extents returned %08x\n", Status);
ExFreePool(comp_data);
return Status;
}
c_stream.zalloc = zlib_alloc;
c_stream.zfree = zlib_free;
c_stream.opaque = (voidpf)0;
ret = deflateInit(&c_stream, fcb->Vcb->options.zlib_level);
if (ret != Z_OK) {
ERR("deflateInit returned %08x\n", ret);
ExFreePool(comp_data);
return STATUS_INTERNAL_ERROR;
}
c_stream.avail_in = (uint32_t)(end_data - start_data);
c_stream.next_in = data;
c_stream.avail_out = (uint32_t)(end_data - start_data);
c_stream.next_out = comp_data;
do {
ret = deflate(&c_stream, Z_FINISH);
if (ret == Z_STREAM_ERROR) {
ERR("deflate returned %x\n", ret);
ExFreePool(comp_data);
return STATUS_INTERNAL_ERROR;
}
} while (c_stream.avail_in > 0 && c_stream.avail_out > 0);
out_left = c_stream.avail_out;
ret = deflateEnd(&c_stream);
if (ret != Z_OK) {
ERR("deflateEnd returned %08x\n", ret);
ExFreePool(comp_data);
return STATUS_INTERNAL_ERROR;
}
if (out_left < fcb->Vcb->superblock.sector_size) { // compressed extent would be larger than or same size as uncompressed extent
ExFreePool(comp_data);
comp_length = (uint32_t)(end_data - start_data);
comp_data = data;
compression = BTRFS_COMPRESSION_NONE;
*compressed = false;
} else {
uint32_t cl;
compression = BTRFS_COMPRESSION_ZLIB;
cl = (uint32_t)(end_data - start_data - out_left);
comp_length = (uint32_t)sector_align(cl, fcb->Vcb->superblock.sector_size);
RtlZeroMemory(comp_data + cl, comp_length - cl);
*compressed = true;
}
ExAcquireResourceSharedLite(&fcb->Vcb->chunk_lock, true);
le = fcb->Vcb->chunks.Flink;
while (le != &fcb->Vcb->chunks) {
c = CONTAINING_RECORD(le, chunk, list_entry);
if (!c->readonly && !c->reloc) {
acquire_chunk_lock(c, fcb->Vcb);
if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) {
if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, false, comp_data, Irp, rollback, compression, end_data - start_data, false, 0)) {
ExReleaseResourceLite(&fcb->Vcb->chunk_lock);
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return STATUS_SUCCESS;
}
}
release_chunk_lock(c, fcb->Vcb);
}
le = le->Flink;
}
ExReleaseResourceLite(&fcb->Vcb->chunk_lock);
ExAcquireResourceExclusiveLite(&fcb->Vcb->chunk_lock, true);
Status = alloc_chunk(fcb->Vcb, fcb->Vcb->data_flags, &c, false);
ExReleaseResourceLite(&fcb->Vcb->chunk_lock);
if (!NT_SUCCESS(Status)) {
ERR("alloc_chunk returned %08x\n", Status);
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return Status;
}
if (c) {
acquire_chunk_lock(c, fcb->Vcb);
if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) {
if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, false, comp_data, Irp, rollback, compression, end_data - start_data, false, 0)) {
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return STATUS_SUCCESS;
}
}
release_chunk_lock(c, fcb->Vcb);
}
WARN("couldn't find any data chunks with %I64x bytes free\n", comp_length);
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return STATUS_DISK_FULL;
}
static NTSTATUS lzo_do_compress(const uint8_t* in, uint32_t in_len, uint8_t* out, uint32_t* out_len, void* wrkmem) {
const uint8_t* ip;
uint32_t dv;
uint8_t* op;
const uint8_t* in_end = in + in_len;
const uint8_t* ip_end = in + in_len - 9 - 4;
const uint8_t* ii;
const uint8_t** dict = (const uint8_t**)wrkmem;
op = out;
ip = in;
ii = ip;
DVAL_FIRST(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++;
DVAL_NEXT(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++;
DVAL_NEXT(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++;
DVAL_NEXT(dv, ip); UPDATE_D(dict, cycle, dv, ip); ip++;
while (1) {
const uint8_t* m_pos;
uint32_t m_len;
ptrdiff_t m_off;
uint32_t lit, dindex;
dindex = DINDEX(dv, ip);
m_pos = dict[dindex];
UPDATE_I(dict, cycle, dindex, ip);
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]) {
lit = (uint32_t)(ip - ii);
m_pos += 3;
if (m_off <= M2_MAX_OFFSET)
goto match;
if (lit == 3) { /* better compression, but slower */
if (op - 2 <= out)
return STATUS_INTERNAL_ERROR;
op[-2] |= LZO_BYTE(3);
*op++ = *ii++; *op++ = *ii++; *op++ = *ii++;
goto code_match;
}
if (*m_pos == ip[3])
goto match;
}
/* a literal */
++ip;
if (ip >= ip_end)
break;
DVAL_NEXT(dv, ip);
continue;
/* a match */
match:
/* store current literal run */
if (lit > 0) {
uint32_t t = lit;
if (t <= 3) {
if (op - 2 <= out)
return STATUS_INTERNAL_ERROR;
op[-2] |= LZO_BYTE(t);
} else if (t <= 18)
*op++ = LZO_BYTE(t - 3);
else {
uint32_t tt = t - 18;
*op++ = 0;
while (tt > 255) {
tt -= 255;
*op++ = 0;
}
if (tt <= 0)
return STATUS_INTERNAL_ERROR;
*op++ = LZO_BYTE(tt);
}
do {
*op++ = *ii++;
} while (--t > 0);
}
/* code the match */
code_match:
if (ii != ip)
return STATUS_INTERNAL_ERROR;
ip += 3;
if (*m_pos++ != *ip++ || *m_pos++ != *ip++ || *m_pos++ != *ip++ ||
*m_pos++ != *ip++ || *m_pos++ != *ip++ || *m_pos++ != *ip++) {
--ip;
m_len = (uint32_t)(ip - ii);
if (m_len < 3 || m_len > 8)
return STATUS_INTERNAL_ERROR;
if (m_off <= M2_MAX_OFFSET) {
m_off -= 1;
*op++ = LZO_BYTE(((m_len - 1) << 5) | ((m_off & 7) << 2));
*op++ = LZO_BYTE(m_off >> 3);
} else if (m_off <= M3_MAX_OFFSET) {
m_off -= 1;
*op++ = LZO_BYTE(M3_MARKER | (m_len - 2));
goto m3_m4_offset;
} else {
m_off -= 0x4000;
if (m_off <= 0 || m_off > 0x7fff)
return STATUS_INTERNAL_ERROR;
*op++ = LZO_BYTE(M4_MARKER | ((m_off & 0x4000) >> 11) | (m_len - 2));
goto m3_m4_offset;
}
} else {
const uint8_t* end;
end = in_end;
while (ip < end && *m_pos == *ip)
m_pos++, ip++;
m_len = (uint32_t)(ip - ii);
if (m_len < 3)
return STATUS_INTERNAL_ERROR;
if (m_off <= M3_MAX_OFFSET) {
m_off -= 1;
if (m_len <= 33)
*op++ = LZO_BYTE(M3_MARKER | (m_len - 2));
else {
m_len -= 33;
*op++ = M3_MARKER | 0;
goto m3_m4_len;
}
} else {
m_off -= 0x4000;
if (m_off <= 0 || m_off > 0x7fff)
return STATUS_INTERNAL_ERROR;
if (m_len <= 9)
*op++ = LZO_BYTE(M4_MARKER | ((m_off & 0x4000) >> 11) | (m_len - 2));
else {
m_len -= 9;
*op++ = LZO_BYTE(M4_MARKER | ((m_off & 0x4000) >> 11));
m3_m4_len:
while (m_len > 255) {
m_len -= 255;
*op++ = 0;
}
if (m_len <= 0)
return STATUS_INTERNAL_ERROR;
*op++ = LZO_BYTE(m_len);
}
}
m3_m4_offset:
*op++ = LZO_BYTE((m_off & 63) << 2);
*op++ = LZO_BYTE(m_off >> 6);
}
ii = ip;
if (ip >= ip_end)
break;
DVAL_FIRST(dv, ip);
}
/* store final literal run */
if (in_end - ii > 0) {
uint32_t t = (uint32_t)(in_end - ii);
if (op == out && t <= 238)
*op++ = LZO_BYTE(17 + t);
else if (t <= 3)
op[-2] |= LZO_BYTE(t);
else if (t <= 18)
*op++ = LZO_BYTE(t - 3);
else {
uint32_t tt = t - 18;
*op++ = 0;
while (tt > 255) {
tt -= 255;
*op++ = 0;
}
if (tt <= 0)
return STATUS_INTERNAL_ERROR;
*op++ = LZO_BYTE(tt);
}
do {
*op++ = *ii++;
} while (--t > 0);
}
*out_len = (uint32_t)(op - out);
return STATUS_SUCCESS;
}
static NTSTATUS lzo1x_1_compress(lzo_stream* stream) {
uint8_t *op = stream->out;
NTSTATUS Status = STATUS_SUCCESS;
if (stream->inlen <= 0)
stream->outlen = 0;
else if (stream->inlen <= 9 + 4) {
*op++ = LZO_BYTE(17 + stream->inlen);
stream->inpos = 0;
do {
*op++ = stream->in[stream->inpos];
stream->inpos++;
} while (stream->inlen < stream->inpos);
stream->outlen = (uint32_t)(op - stream->out);
} else
Status = lzo_do_compress(stream->in, stream->inlen, stream->out, &stream->outlen, stream->wrkmem);
if (Status == STATUS_SUCCESS) {
op = stream->out + stream->outlen;
*op++ = M4_MARKER | 1;
*op++ = 0;
*op++ = 0;
stream->outlen += 3;
}
return Status;
}
static __inline uint32_t lzo_max_outlen(uint32_t inlen) {
return inlen + (inlen / 16) + 64 + 3; // formula comes from LZO.FAQ
}
static NTSTATUS lzo_write_compressed_bit(fcb* fcb, uint64_t start_data, uint64_t end_data, void* data, bool* compressed, PIRP Irp, LIST_ENTRY* rollback) {
NTSTATUS Status;
uint8_t compression;
uint64_t comp_length;
ULONG comp_data_len, num_pages, i;
uint8_t* comp_data;
bool skip_compression = false;
lzo_stream stream;
uint32_t* out_size;
LIST_ENTRY* le;
chunk* c;
num_pages = (ULONG)((sector_align(end_data - start_data, LZO_PAGE_SIZE)) / LZO_PAGE_SIZE);
// Four-byte overall header
// Another four-byte header page
// Each page has a maximum size of lzo_max_outlen(LZO_PAGE_SIZE)
// Plus another four bytes for possible padding
comp_data_len = sizeof(uint32_t) + ((lzo_max_outlen(LZO_PAGE_SIZE) + (2 * sizeof(uint32_t))) * num_pages);
comp_data = ExAllocatePoolWithTag(PagedPool, comp_data_len, ALLOC_TAG);
if (!comp_data) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
stream.wrkmem = ExAllocatePoolWithTag(PagedPool, LZO1X_MEM_COMPRESS, ALLOC_TAG);
if (!stream.wrkmem) {
ERR("out of memory\n");
ExFreePool(comp_data);
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = excise_extents(fcb->Vcb, fcb, start_data, end_data, Irp, rollback);
if (!NT_SUCCESS(Status)) {
ERR("excise_extents returned %08x\n", Status);
ExFreePool(comp_data);
ExFreePool(stream.wrkmem);
return Status;
}
out_size = (uint32_t*)comp_data;
*out_size = sizeof(uint32_t);
stream.in = data;
stream.out = comp_data + (2 * sizeof(uint32_t));
for (i = 0; i < num_pages; i++) {
uint32_t* pagelen = (uint32_t*)(stream.out - sizeof(uint32_t));
stream.inlen = (uint32_t)min(LZO_PAGE_SIZE, end_data - start_data - (i * LZO_PAGE_SIZE));
Status = lzo1x_1_compress(&stream);
if (!NT_SUCCESS(Status)) {
ERR("lzo1x_1_compress returned %08x\n", Status);
skip_compression = true;
break;
}
*pagelen = stream.outlen;
*out_size += stream.outlen + sizeof(uint32_t);
stream.in += LZO_PAGE_SIZE;
stream.out += stream.outlen + sizeof(uint32_t);
if (LZO_PAGE_SIZE - (*out_size % LZO_PAGE_SIZE) < sizeof(uint32_t)) {
RtlZeroMemory(stream.out, LZO_PAGE_SIZE - (*out_size % LZO_PAGE_SIZE));
stream.out += LZO_PAGE_SIZE - (*out_size % LZO_PAGE_SIZE);
*out_size += LZO_PAGE_SIZE - (*out_size % LZO_PAGE_SIZE);
}
}
ExFreePool(stream.wrkmem);
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
ExFreePool(comp_data);
comp_length = end_data - start_data;
comp_data = data;
compression = BTRFS_COMPRESSION_NONE;
*compressed = false;
} else {
compression = BTRFS_COMPRESSION_LZO;
comp_length = sector_align(*out_size, fcb->Vcb->superblock.sector_size);
RtlZeroMemory(comp_data + *out_size, (ULONG)(comp_length - *out_size));
*compressed = true;
}
ExAcquireResourceSharedLite(&fcb->Vcb->chunk_lock, true);
le = fcb->Vcb->chunks.Flink;
while (le != &fcb->Vcb->chunks) {
c = CONTAINING_RECORD(le, chunk, list_entry);
if (!c->readonly && !c->reloc) {
acquire_chunk_lock(c, fcb->Vcb);
if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) {
if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, false, comp_data, Irp, rollback, compression, end_data - start_data, false, 0)) {
ExReleaseResourceLite(&fcb->Vcb->chunk_lock);
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return STATUS_SUCCESS;
}
}
release_chunk_lock(c, fcb->Vcb);
}
le = le->Flink;
}
ExReleaseResourceLite(&fcb->Vcb->chunk_lock);
ExAcquireResourceExclusiveLite(&fcb->Vcb->chunk_lock, true);
Status = alloc_chunk(fcb->Vcb, fcb->Vcb->data_flags, &c, false);
ExReleaseResourceLite(&fcb->Vcb->chunk_lock);
if (!NT_SUCCESS(Status)) {
ERR("alloc_chunk returned %08x\n", Status);
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return Status;
}
if (c) {
acquire_chunk_lock(c, fcb->Vcb);
if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) {
if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, false, comp_data, Irp, rollback, compression, end_data - start_data, false, 0)) {
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return STATUS_SUCCESS;
}
}
release_chunk_lock(c, fcb->Vcb);
}
WARN("couldn't find any data chunks with %I64x bytes free\n", comp_length);
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return STATUS_DISK_FULL;
}
static NTSTATUS zstd_write_compressed_bit(fcb* fcb, uint64_t start_data, uint64_t end_data, void* data, bool* compressed, PIRP Irp, LIST_ENTRY* rollback) {
NTSTATUS Status;
uint8_t compression;
uint32_t comp_length;
uint8_t* comp_data;
uint32_t out_left;
LIST_ENTRY* le;
chunk* c;
ZSTD_CStream* stream;
size_t init_res, written;
ZSTD_inBuffer input;
ZSTD_outBuffer output;
ZSTD_parameters params;
comp_data = ExAllocatePoolWithTag(PagedPool, (uint32_t)(end_data - start_data), ALLOC_TAG);
if (!comp_data) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = excise_extents(fcb->Vcb, fcb, start_data, end_data, Irp, rollback);
if (!NT_SUCCESS(Status)) {
ERR("excise_extents returned %08x\n", Status);
ExFreePool(comp_data);
return Status;
}
stream = ZSTD_createCStream_advanced(zstd_mem);
if (!stream) {
ERR("ZSTD_createCStream failed.\n");
ExFreePool(comp_data);
return STATUS_INTERNAL_ERROR;
}
params = ZSTD_getParams(fcb->Vcb->options.zstd_level, (uint32_t)(end_data - start_data), 0);
if (params.cParams.windowLog > ZSTD_BTRFS_MAX_WINDOWLOG)
params.cParams.windowLog = ZSTD_BTRFS_MAX_WINDOWLOG;
init_res = ZSTD_initCStream_advanced(stream, NULL, 0, params, (uint32_t)(end_data - start_data));
if (ZSTD_isError(init_res)) {
ERR("ZSTD_initCStream_advanced failed: %s\n", ZSTD_getErrorName(init_res));
ZSTD_freeCStream(stream);
ExFreePool(comp_data);
return STATUS_INTERNAL_ERROR;
}
input.src = data;
input.size = (uint32_t)(end_data - start_data);
input.pos = 0;
output.dst = comp_data;
output.size = (uint32_t)(end_data - start_data);
output.pos = 0;
while (input.pos < input.size && output.pos < output.size) {
written = ZSTD_compressStream(stream, &output, &input);
if (ZSTD_isError(written)) {
ERR("ZSTD_compressStream failed: %s\n", ZSTD_getErrorName(written));
ZSTD_freeCStream(stream);
ExFreePool(comp_data);
return STATUS_INTERNAL_ERROR;
}
}
written = ZSTD_endStream(stream, &output);
if (ZSTD_isError(written)) {
ERR("ZSTD_endStream failed: %s\n", ZSTD_getErrorName(written));
ZSTD_freeCStream(stream);
ExFreePool(comp_data);
return STATUS_INTERNAL_ERROR;
}
ZSTD_freeCStream(stream);
out_left = output.size - output.pos;
if (out_left < fcb->Vcb->superblock.sector_size) { // compressed extent would be larger than or same size as uncompressed extent
ExFreePool(comp_data);
comp_length = (uint32_t)(end_data - start_data);
comp_data = data;
compression = BTRFS_COMPRESSION_NONE;
*compressed = false;
} else {
uint32_t cl;
compression = BTRFS_COMPRESSION_ZSTD;
cl = (uint32_t)(end_data - start_data - out_left);
comp_length = (uint32_t)sector_align(cl, fcb->Vcb->superblock.sector_size);
RtlZeroMemory(comp_data + cl, comp_length - cl);
*compressed = true;
}
ExAcquireResourceSharedLite(&fcb->Vcb->chunk_lock, true);
le = fcb->Vcb->chunks.Flink;
while (le != &fcb->Vcb->chunks) {
c = CONTAINING_RECORD(le, chunk, list_entry);
if (!c->readonly && !c->reloc) {
acquire_chunk_lock(c, fcb->Vcb);
if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) {
if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, false, comp_data, Irp, rollback, compression, end_data - start_data, false, 0)) {
ExReleaseResourceLite(&fcb->Vcb->chunk_lock);
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return STATUS_SUCCESS;
}
}
release_chunk_lock(c, fcb->Vcb);
}
le = le->Flink;
}
ExReleaseResourceLite(&fcb->Vcb->chunk_lock);
ExAcquireResourceExclusiveLite(&fcb->Vcb->chunk_lock, true);
Status = alloc_chunk(fcb->Vcb, fcb->Vcb->data_flags, &c, false);
ExReleaseResourceLite(&fcb->Vcb->chunk_lock);
if (!NT_SUCCESS(Status)) {
ERR("alloc_chunk returned %08x\n", Status);
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return Status;
}
if (c) {
acquire_chunk_lock(c, fcb->Vcb);
if (c->chunk_item->type == fcb->Vcb->data_flags && (c->chunk_item->size - c->used) >= comp_length) {
if (insert_extent_chunk(fcb->Vcb, fcb, c, start_data, comp_length, false, comp_data, Irp, rollback, compression, end_data - start_data, false, 0)) {
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return STATUS_SUCCESS;
}
}
release_chunk_lock(c, fcb->Vcb);
}
WARN("couldn't find any data chunks with %I64x bytes free\n", comp_length);
if (compression != BTRFS_COMPRESSION_NONE)
ExFreePool(comp_data);
return STATUS_DISK_FULL;
}
NTSTATUS write_compressed_bit(fcb* fcb, uint64_t start_data, uint64_t end_data, void* data, bool* compressed, PIRP Irp, LIST_ENTRY* rollback) {
uint8_t type;
if (fcb->Vcb->options.compress_type != 0 && fcb->prop_compression == PropCompression_None)
type = fcb->Vcb->options.compress_type;
else {
if (!(fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_ZSTD) && fcb->prop_compression == PropCompression_ZSTD)
type = BTRFS_COMPRESSION_ZSTD;
else if (fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_ZSTD && fcb->prop_compression != PropCompression_Zlib && fcb->prop_compression != PropCompression_LZO)
type = BTRFS_COMPRESSION_ZSTD;
else if (!(fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_LZO) && fcb->prop_compression == PropCompression_LZO)
type = BTRFS_COMPRESSION_LZO;
else if (fcb->Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_COMPRESS_LZO && fcb->prop_compression != PropCompression_Zlib)
type = BTRFS_COMPRESSION_LZO;
else
type = BTRFS_COMPRESSION_ZLIB;
}
if (type == BTRFS_COMPRESSION_ZSTD) {
fcb->Vcb->superblock.incompat_flags |= BTRFS_INCOMPAT_FLAGS_COMPRESS_ZSTD;
return zstd_write_compressed_bit(fcb, start_data, end_data, data, compressed, Irp, rollback);
} else if (type == BTRFS_COMPRESSION_LZO) {
fcb->Vcb->superblock.incompat_flags |= BTRFS_INCOMPAT_FLAGS_COMPRESS_LZO;
return lzo_write_compressed_bit(fcb, start_data, end_data, data, compressed, Irp, rollback);
} else
return zlib_write_compressed_bit(fcb, start_data, end_data, data, compressed, Irp, rollback);
}
static void* zstd_malloc(void* opaque, size_t size) {
UNUSED(opaque);
return ExAllocatePoolWithTag(PagedPool, size, ZSTD_ALLOC_TAG);
}
static void zstd_free(void* opaque, void* address) {
UNUSED(opaque);
ExFreePool(address);
}
NTSTATUS zstd_decompress(uint8_t* inbuf, uint32_t inlen, uint8_t* outbuf, uint32_t outlen) {
NTSTATUS Status;
ZSTD_DStream* stream;
size_t init_res, read;
ZSTD_inBuffer input;
ZSTD_outBuffer output;
stream = ZSTD_createDStream_advanced(zstd_mem);
if (!stream) {
ERR("ZSTD_createDStream failed.\n");
return STATUS_INTERNAL_ERROR;
}
init_res = ZSTD_initDStream(stream);
if (ZSTD_isError(init_res)) {
ERR("ZSTD_initDStream failed: %s\n", ZSTD_getErrorName(init_res));
Status = STATUS_INTERNAL_ERROR;
goto end;
}
input.src = inbuf;
input.size = inlen;
input.pos = 0;
output.dst = outbuf;
output.size = outlen;
output.pos = 0;
read = ZSTD_decompressStream(stream, &output, &input);
if (ZSTD_isError(read)) {
ERR("ZSTD_decompressStream failed: %s\n", ZSTD_getErrorName(read));
Status = STATUS_INTERNAL_ERROR;
goto end;
}
Status = STATUS_SUCCESS;
end:
ZSTD_freeDStream(stream);
return Status;
}
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