diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/Makefile.objs | 2 | ||||
| -rw-r--r-- | block/qcow2-threads.c | 201 | ||||
| -rw-r--r-- | block/qcow2.c | 169 | ||||
| -rw-r--r-- | block/qcow2.h | 7 |
4 files changed, 209 insertions, 170 deletions
diff --git a/block/Makefile.objs b/block/Makefile.objs index 7a81892..ae11605 100644 --- a/block/Makefile.objs +++ b/block/Makefile.objs @@ -6,7 +6,7 @@ block-obj-$(CONFIG_BOCHS) += bochs.o block-obj-$(CONFIG_VVFAT) += vvfat.o block-obj-$(CONFIG_DMG) += dmg.o -block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o qcow2-bitmap.o +block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o qcow2-bitmap.o qcow2-threads.o block-obj-$(CONFIG_QED) += qed.o qed-l2-cache.o qed-table.o qed-cluster.o block-obj-$(CONFIG_QED) += qed-check.o block-obj-y += vhdx.o vhdx-endian.o vhdx-log.o diff --git a/block/qcow2-threads.c b/block/qcow2-threads.c new file mode 100644 index 0000000..85b8034 --- /dev/null +++ b/block/qcow2-threads.c @@ -0,0 +1,201 @@ +/* + * Threaded data processing for Qcow2: compression, encryption + * + * Copyright (c) 2004-2006 Fabrice Bellard + * Copyright (c) 2018 Virtuozzo International GmbH. All rights reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "qemu/osdep.h" + +#define ZLIB_CONST +#include <zlib.h> + +#include "qcow2.h" +#include "block/thread-pool.h" + +#define MAX_COMPRESS_THREADS 4 + +typedef ssize_t (*Qcow2CompressFunc)(void *dest, size_t dest_size, + const void *src, size_t src_size); +typedef struct Qcow2CompressData { + void *dest; + size_t dest_size; + const void *src; + size_t src_size; + ssize_t ret; + + Qcow2CompressFunc func; +} Qcow2CompressData; + +/* + * qcow2_compress() + * + * @dest - destination buffer, @dest_size bytes + * @src - source buffer, @src_size bytes + * + * Returns: compressed size on success + * -ENOMEM destination buffer is not enough to store compressed data + * -EIO on any other error + */ +static ssize_t qcow2_compress(void *dest, size_t dest_size, + const void *src, size_t src_size) +{ + ssize_t ret; + z_stream strm; + + /* best compression, small window, no zlib header */ + memset(&strm, 0, sizeof(strm)); + ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, + -12, 9, Z_DEFAULT_STRATEGY); + if (ret != Z_OK) { + return -EIO; + } + + /* + * strm.next_in is not const in old zlib versions, such as those used on + * OpenBSD/NetBSD, so cast the const away + */ + strm.avail_in = src_size; + strm.next_in = (void *) src; + strm.avail_out = dest_size; + strm.next_out = dest; + + ret = deflate(&strm, Z_FINISH); + if (ret == Z_STREAM_END) { + ret = dest_size - strm.avail_out; + } else { + ret = (ret == Z_OK ? -ENOMEM : -EIO); + } + + deflateEnd(&strm); + + return ret; +} + +/* + * qcow2_decompress() + * + * Decompress some data (not more than @src_size bytes) to produce exactly + * @dest_size bytes. + * + * @dest - destination buffer, @dest_size bytes + * @src - source buffer, @src_size bytes + * + * Returns: 0 on success + * -1 on fail + */ +static ssize_t qcow2_decompress(void *dest, size_t dest_size, + const void *src, size_t src_size) +{ + int ret = 0; + z_stream strm; + + memset(&strm, 0, sizeof(strm)); + strm.avail_in = src_size; + strm.next_in = (void *) src; + strm.avail_out = dest_size; + strm.next_out = dest; + + ret = inflateInit2(&strm, -12); + if (ret != Z_OK) { + return -1; + } + + ret = inflate(&strm, Z_FINISH); + if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || strm.avail_out != 0) { + /* + * We approve Z_BUF_ERROR because we need @dest buffer to be filled, but + * @src buffer may be processed partly (because in qcow2 we know size of + * compressed data with precision of one sector) + */ + ret = -1; + } + + inflateEnd(&strm); + + return ret; +} + +static int qcow2_compress_pool_func(void *opaque) +{ + Qcow2CompressData *data = opaque; + + data->ret = data->func(data->dest, data->dest_size, + data->src, data->src_size); + + return 0; +} + +static void qcow2_compress_complete(void *opaque, int ret) +{ + qemu_coroutine_enter(opaque); +} + +static ssize_t coroutine_fn +qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size, + const void *src, size_t src_size, Qcow2CompressFunc func) +{ + BDRVQcow2State *s = bs->opaque; + BlockAIOCB *acb; + ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs)); + Qcow2CompressData arg = { + .dest = dest, + .dest_size = dest_size, + .src = src, + .src_size = src_size, + .func = func, + }; + + while (s->nb_compress_threads >= MAX_COMPRESS_THREADS) { + qemu_co_queue_wait(&s->compress_wait_queue, NULL); + } + + s->nb_compress_threads++; + acb = thread_pool_submit_aio(pool, qcow2_compress_pool_func, &arg, + qcow2_compress_complete, + qemu_coroutine_self()); + + if (!acb) { + s->nb_compress_threads--; + return -EINVAL; + } + qemu_coroutine_yield(); + s->nb_compress_threads--; + qemu_co_queue_next(&s->compress_wait_queue); + + return arg.ret; +} + +ssize_t coroutine_fn +qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size, + const void *src, size_t src_size) +{ + return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, + qcow2_compress); +} + +ssize_t coroutine_fn +qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size, + const void *src, size_t src_size) +{ + return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, + qcow2_decompress); +} diff --git a/block/qcow2.c b/block/qcow2.c index 38bf729..a8c4b11 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -24,9 +24,6 @@ #include "qemu/osdep.h" -#define ZLIB_CONST -#include <zlib.h> - #include "block/qdict.h" #include "sysemu/block-backend.h" #include "qemu/module.h" @@ -43,7 +40,6 @@ #include "qapi/qobject-input-visitor.h" #include "qapi/qapi-visit-block-core.h" #include "crypto.h" -#include "block/thread-pool.h" /* Differences with QCOW: @@ -3920,171 +3916,6 @@ fail: return ret; } -/* - * qcow2_compress() - * - * @dest - destination buffer, @dest_size bytes - * @src - source buffer, @src_size bytes - * - * Returns: compressed size on success - * -ENOMEM destination buffer is not enough to store compressed data - * -EIO on any other error - */ -static ssize_t qcow2_compress(void *dest, size_t dest_size, - const void *src, size_t src_size) -{ - ssize_t ret; - z_stream strm; - - /* best compression, small window, no zlib header */ - memset(&strm, 0, sizeof(strm)); - ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, - -12, 9, Z_DEFAULT_STRATEGY); - if (ret != Z_OK) { - return -EIO; - } - - /* strm.next_in is not const in old zlib versions, such as those used on - * OpenBSD/NetBSD, so cast the const away */ - strm.avail_in = src_size; - strm.next_in = (void *) src; - strm.avail_out = dest_size; - strm.next_out = dest; - - ret = deflate(&strm, Z_FINISH); - if (ret == Z_STREAM_END) { - ret = dest_size - strm.avail_out; - } else { - ret = (ret == Z_OK ? -ENOMEM : -EIO); - } - - deflateEnd(&strm); - - return ret; -} - -/* - * qcow2_decompress() - * - * Decompress some data (not more than @src_size bytes) to produce exactly - * @dest_size bytes. - * - * @dest - destination buffer, @dest_size bytes - * @src - source buffer, @src_size bytes - * - * Returns: 0 on success - * -1 on fail - */ -static ssize_t qcow2_decompress(void *dest, size_t dest_size, - const void *src, size_t src_size) -{ - int ret = 0; - z_stream strm; - - memset(&strm, 0, sizeof(strm)); - strm.avail_in = src_size; - strm.next_in = (void *) src; - strm.avail_out = dest_size; - strm.next_out = dest; - - ret = inflateInit2(&strm, -12); - if (ret != Z_OK) { - return -1; - } - - ret = inflate(&strm, Z_FINISH); - if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || strm.avail_out != 0) { - /* We approve Z_BUF_ERROR because we need @dest buffer to be filled, but - * @src buffer may be processed partly (because in qcow2 we know size of - * compressed data with precision of one sector) */ - ret = -1; - } - - inflateEnd(&strm); - - return ret; -} - -#define MAX_COMPRESS_THREADS 4 - -typedef ssize_t (*Qcow2CompressFunc)(void *dest, size_t dest_size, - const void *src, size_t src_size); -typedef struct Qcow2CompressData { - void *dest; - size_t dest_size; - const void *src; - size_t src_size; - ssize_t ret; - - Qcow2CompressFunc func; -} Qcow2CompressData; - -static int qcow2_compress_pool_func(void *opaque) -{ - Qcow2CompressData *data = opaque; - - data->ret = data->func(data->dest, data->dest_size, - data->src, data->src_size); - - return 0; -} - -static void qcow2_compress_complete(void *opaque, int ret) -{ - qemu_coroutine_enter(opaque); -} - -static ssize_t coroutine_fn -qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size, - const void *src, size_t src_size, Qcow2CompressFunc func) -{ - BDRVQcow2State *s = bs->opaque; - BlockAIOCB *acb; - ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs)); - Qcow2CompressData arg = { - .dest = dest, - .dest_size = dest_size, - .src = src, - .src_size = src_size, - .func = func, - }; - - while (s->nb_compress_threads >= MAX_COMPRESS_THREADS) { - qemu_co_queue_wait(&s->compress_wait_queue, NULL); - } - - s->nb_compress_threads++; - acb = thread_pool_submit_aio(pool, qcow2_compress_pool_func, &arg, - qcow2_compress_complete, - qemu_coroutine_self()); - - if (!acb) { - s->nb_compress_threads--; - return -EINVAL; - } - qemu_coroutine_yield(); - s->nb_compress_threads--; - qemu_co_queue_next(&s->compress_wait_queue); - - return arg.ret; -} - -static ssize_t coroutine_fn -qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size, - const void *src, size_t src_size) -{ - return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, - qcow2_compress); -} - -static ssize_t coroutine_fn -qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size, - const void *src, size_t src_size) -{ - return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, - qcow2_decompress); -} - /* XXX: put compressed sectors first, then all the cluster aligned tables to avoid losing bytes in alignment */ static coroutine_fn int diff --git a/block/qcow2.h b/block/qcow2.h index c2b0e95..8207ed3 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -738,4 +738,11 @@ void qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs, const char *name, Error **errp); +ssize_t coroutine_fn +qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size, + const void *src, size_t src_size); +ssize_t coroutine_fn +qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size, + const void *src, size_t src_size); + #endif |