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qcow2: add separate file for threaded data processing functions
Move compression-on-threads to separate file. Encryption will be in it too. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 20190506142741.41731-3-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy
Max Reitz
parent
9353db47c5
commit
56e2f1d898
@ -6,7 +6,7 @@ block-obj-$(CONFIG_BOCHS) += bochs.o
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block-obj-$(CONFIG_VVFAT) += vvfat.o
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block-obj-$(CONFIG_DMG) += dmg.o
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block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o qcow2-bitmap.o
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block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o qcow2-bitmap.o qcow2-threads.o
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block-obj-$(CONFIG_QED) += qed.o qed-l2-cache.o qed-table.o qed-cluster.o
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block-obj-$(CONFIG_QED) += qed-check.o
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block-obj-y += vhdx.o vhdx-endian.o vhdx-log.o
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201
block/qcow2-threads.c
Normal file
201
block/qcow2-threads.c
Normal file
@ -0,0 +1,201 @@
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/*
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* Threaded data processing for Qcow2: compression, encryption
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*
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* Copyright (c) 2004-2006 Fabrice Bellard
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* Copyright (c) 2018 Virtuozzo International GmbH. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#define ZLIB_CONST
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#include <zlib.h>
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#include "qcow2.h"
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#include "block/thread-pool.h"
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#define MAX_COMPRESS_THREADS 4
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typedef ssize_t (*Qcow2CompressFunc)(void *dest, size_t dest_size,
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const void *src, size_t src_size);
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typedef struct Qcow2CompressData {
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void *dest;
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size_t dest_size;
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const void *src;
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size_t src_size;
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ssize_t ret;
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Qcow2CompressFunc func;
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} Qcow2CompressData;
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/*
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* qcow2_compress()
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*
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* @dest - destination buffer, @dest_size bytes
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* @src - source buffer, @src_size bytes
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*
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* Returns: compressed size on success
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* -ENOMEM destination buffer is not enough to store compressed data
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* -EIO on any other error
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*/
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static ssize_t qcow2_compress(void *dest, size_t dest_size,
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const void *src, size_t src_size)
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{
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ssize_t ret;
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z_stream strm;
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/* best compression, small window, no zlib header */
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memset(&strm, 0, sizeof(strm));
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ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
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-12, 9, Z_DEFAULT_STRATEGY);
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if (ret != Z_OK) {
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return -EIO;
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}
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/*
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* strm.next_in is not const in old zlib versions, such as those used on
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* OpenBSD/NetBSD, so cast the const away
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*/
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strm.avail_in = src_size;
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strm.next_in = (void *) src;
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strm.avail_out = dest_size;
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strm.next_out = dest;
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ret = deflate(&strm, Z_FINISH);
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if (ret == Z_STREAM_END) {
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ret = dest_size - strm.avail_out;
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} else {
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ret = (ret == Z_OK ? -ENOMEM : -EIO);
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}
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deflateEnd(&strm);
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return ret;
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}
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/*
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* qcow2_decompress()
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*
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* Decompress some data (not more than @src_size bytes) to produce exactly
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* @dest_size bytes.
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*
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* @dest - destination buffer, @dest_size bytes
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* @src - source buffer, @src_size bytes
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*
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* Returns: 0 on success
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* -1 on fail
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*/
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static ssize_t qcow2_decompress(void *dest, size_t dest_size,
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const void *src, size_t src_size)
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{
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int ret = 0;
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z_stream strm;
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memset(&strm, 0, sizeof(strm));
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strm.avail_in = src_size;
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strm.next_in = (void *) src;
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strm.avail_out = dest_size;
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strm.next_out = dest;
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ret = inflateInit2(&strm, -12);
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if (ret != Z_OK) {
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return -1;
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}
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ret = inflate(&strm, Z_FINISH);
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if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || strm.avail_out != 0) {
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/*
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* We approve Z_BUF_ERROR because we need @dest buffer to be filled, but
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* @src buffer may be processed partly (because in qcow2 we know size of
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* compressed data with precision of one sector)
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*/
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ret = -1;
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}
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inflateEnd(&strm);
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return ret;
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}
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static int qcow2_compress_pool_func(void *opaque)
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{
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Qcow2CompressData *data = opaque;
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data->ret = data->func(data->dest, data->dest_size,
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data->src, data->src_size);
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return 0;
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}
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static void qcow2_compress_complete(void *opaque, int ret)
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{
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qemu_coroutine_enter(opaque);
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}
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static ssize_t coroutine_fn
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qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size,
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const void *src, size_t src_size, Qcow2CompressFunc func)
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{
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BDRVQcow2State *s = bs->opaque;
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BlockAIOCB *acb;
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ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
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Qcow2CompressData arg = {
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.dest = dest,
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.dest_size = dest_size,
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.src = src,
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.src_size = src_size,
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.func = func,
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};
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while (s->nb_compress_threads >= MAX_COMPRESS_THREADS) {
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qemu_co_queue_wait(&s->compress_wait_queue, NULL);
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}
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s->nb_compress_threads++;
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acb = thread_pool_submit_aio(pool, qcow2_compress_pool_func, &arg,
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qcow2_compress_complete,
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qemu_coroutine_self());
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if (!acb) {
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s->nb_compress_threads--;
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return -EINVAL;
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}
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qemu_coroutine_yield();
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s->nb_compress_threads--;
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qemu_co_queue_next(&s->compress_wait_queue);
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return arg.ret;
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}
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ssize_t coroutine_fn
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qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size,
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const void *src, size_t src_size)
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{
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return qcow2_co_do_compress(bs, dest, dest_size, src, src_size,
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qcow2_compress);
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}
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ssize_t coroutine_fn
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qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size,
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const void *src, size_t src_size)
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{
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return qcow2_co_do_compress(bs, dest, dest_size, src, src_size,
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qcow2_decompress);
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}
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169
block/qcow2.c
169
block/qcow2.c
@ -24,9 +24,6 @@
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#include "qemu/osdep.h"
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#define ZLIB_CONST
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#include <zlib.h>
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#include "block/qdict.h"
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#include "sysemu/block-backend.h"
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#include "qemu/module.h"
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@ -43,7 +40,6 @@
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#include "qapi/qobject-input-visitor.h"
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#include "qapi/qapi-visit-block-core.h"
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#include "crypto.h"
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#include "block/thread-pool.h"
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/*
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Differences with QCOW:
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@ -3920,171 +3916,6 @@ fail:
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return ret;
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}
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/*
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* qcow2_compress()
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*
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* @dest - destination buffer, @dest_size bytes
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* @src - source buffer, @src_size bytes
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*
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* Returns: compressed size on success
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* -ENOMEM destination buffer is not enough to store compressed data
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* -EIO on any other error
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*/
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static ssize_t qcow2_compress(void *dest, size_t dest_size,
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const void *src, size_t src_size)
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{
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ssize_t ret;
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z_stream strm;
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/* best compression, small window, no zlib header */
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memset(&strm, 0, sizeof(strm));
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ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
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-12, 9, Z_DEFAULT_STRATEGY);
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if (ret != Z_OK) {
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return -EIO;
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}
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/* strm.next_in is not const in old zlib versions, such as those used on
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* OpenBSD/NetBSD, so cast the const away */
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strm.avail_in = src_size;
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strm.next_in = (void *) src;
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strm.avail_out = dest_size;
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strm.next_out = dest;
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ret = deflate(&strm, Z_FINISH);
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if (ret == Z_STREAM_END) {
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ret = dest_size - strm.avail_out;
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} else {
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ret = (ret == Z_OK ? -ENOMEM : -EIO);
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}
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deflateEnd(&strm);
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return ret;
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}
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/*
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* qcow2_decompress()
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*
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* Decompress some data (not more than @src_size bytes) to produce exactly
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* @dest_size bytes.
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*
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* @dest - destination buffer, @dest_size bytes
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* @src - source buffer, @src_size bytes
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*
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* Returns: 0 on success
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* -1 on fail
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*/
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static ssize_t qcow2_decompress(void *dest, size_t dest_size,
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const void *src, size_t src_size)
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{
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int ret = 0;
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z_stream strm;
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memset(&strm, 0, sizeof(strm));
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strm.avail_in = src_size;
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strm.next_in = (void *) src;
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strm.avail_out = dest_size;
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strm.next_out = dest;
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ret = inflateInit2(&strm, -12);
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if (ret != Z_OK) {
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return -1;
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}
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ret = inflate(&strm, Z_FINISH);
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if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || strm.avail_out != 0) {
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/* We approve Z_BUF_ERROR because we need @dest buffer to be filled, but
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* @src buffer may be processed partly (because in qcow2 we know size of
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* compressed data with precision of one sector) */
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ret = -1;
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}
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inflateEnd(&strm);
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return ret;
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}
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#define MAX_COMPRESS_THREADS 4
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typedef ssize_t (*Qcow2CompressFunc)(void *dest, size_t dest_size,
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const void *src, size_t src_size);
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typedef struct Qcow2CompressData {
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void *dest;
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size_t dest_size;
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const void *src;
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size_t src_size;
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ssize_t ret;
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Qcow2CompressFunc func;
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} Qcow2CompressData;
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static int qcow2_compress_pool_func(void *opaque)
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{
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Qcow2CompressData *data = opaque;
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data->ret = data->func(data->dest, data->dest_size,
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data->src, data->src_size);
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return 0;
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}
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static void qcow2_compress_complete(void *opaque, int ret)
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{
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qemu_coroutine_enter(opaque);
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}
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static ssize_t coroutine_fn
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qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size,
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const void *src, size_t src_size, Qcow2CompressFunc func)
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{
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BDRVQcow2State *s = bs->opaque;
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BlockAIOCB *acb;
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ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
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Qcow2CompressData arg = {
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.dest = dest,
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.dest_size = dest_size,
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.src = src,
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.src_size = src_size,
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.func = func,
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};
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while (s->nb_compress_threads >= MAX_COMPRESS_THREADS) {
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qemu_co_queue_wait(&s->compress_wait_queue, NULL);
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}
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s->nb_compress_threads++;
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acb = thread_pool_submit_aio(pool, qcow2_compress_pool_func, &arg,
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qcow2_compress_complete,
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qemu_coroutine_self());
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if (!acb) {
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s->nb_compress_threads--;
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return -EINVAL;
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}
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qemu_coroutine_yield();
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s->nb_compress_threads--;
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qemu_co_queue_next(&s->compress_wait_queue);
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return arg.ret;
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}
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static ssize_t coroutine_fn
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qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size,
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const void *src, size_t src_size)
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{
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return qcow2_co_do_compress(bs, dest, dest_size, src, src_size,
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qcow2_compress);
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}
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static ssize_t coroutine_fn
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qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size,
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const void *src, size_t src_size)
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{
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return qcow2_co_do_compress(bs, dest, dest_size, src, src_size,
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qcow2_decompress);
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}
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/* XXX: put compressed sectors first, then all the cluster aligned
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tables to avoid losing bytes in alignment */
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static coroutine_fn int
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@ -738,4 +738,11 @@ void qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs,
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const char *name,
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Error **errp);
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ssize_t coroutine_fn
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qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size,
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const void *src, size_t src_size);
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ssize_t coroutine_fn
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qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size,
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const void *src, size_t src_size);
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#endif
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