[Qemu-devel] [PATCH v6 0/8] qcow2: encryption threads

[Qemu-devel] [PATCH v6 0/8] qcow2: encryption threads

[Vladimir Sementsov-Ogievskiy]

v6:
 - Rebase on master, so 02 changed to reflect changes in
   qcow2_compress(), keep r-b.
 - Rewrite 06 to even simpler locking [Max], drop r-b
   Drop following
   "qcow2: qcow2_co_preadv: skip using hd_qiov when possible", I'll do
   it in my other coming soon series, and it is actually unrelated to
   current.
 - Drop controversial perf test, hope I'll return to this topic, but not
   in context of these series.
 - Add Max's r-b's to all here, except 06

Vladimir Sementsov-Ogievskiy (8):
  qcow2.h: add missing include
  qcow2: add separate file for threaded data processing functions
  qcow2-threads: use thread_pool_submit_co
  qcow2-threads: qcow2_co_do_compress: protect queuing by mutex
  qcow2-threads: split out generic path
  qcow2: qcow2_co_preadv: improve locking
  qcow2: bdrv_co_pwritev: move encryption code out of the lock
  qcow2: do encryption in threads

 block/qcow2.h          |  20 ++-
 block/qcow2-bitmap.c   |   1 -
 block/qcow2-cache.c    |   1 -
 block/qcow2-cluster.c  |   8 +-
 block/qcow2-refcount.c |   1 -
 block/qcow2-snapshot.c |   1 -
 block/qcow2-threads.c  | 268 +++++++++++++++++++++++++++++++++++++++++
 block/qcow2.c          | 241 +++++-------------------------------
 block/Makefile.objs    |   2 +-
 9 files changed, 321 insertions(+), 222 deletions(-)
 create mode 100644 block/qcow2-threads.c

-- 
2.18.0

[Qemu-devel] [PATCH v6 1/8] qcow2.h: add missing include

[Vladimir Sementsov-Ogievskiy]

qcow2.h depends on block_int.h. Compilation isn't broken currently only
due to block_int.h always included before qcow2.h. Though, it seems
better to directly include block_int.h in qcow2.h.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2.h          | 1 +
 block/qcow2-bitmap.c   | 1 -
 block/qcow2-cache.c    | 1 -
 block/qcow2-cluster.c  | 1 -
 block/qcow2-refcount.c | 1 -
 block/qcow2-snapshot.c | 1 -
 block/qcow2.c          | 1 -
 7 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/block/qcow2.h b/block/qcow2.h
index fdee297f33..ecb026e19a 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -28,6 +28,7 @@
 #include "crypto/block.h"
 #include "qemu/coroutine.h"
 #include "qemu/units.h"
+#include "block/block_int.h"
 
 //#define DEBUG_ALLOC
 //#define DEBUG_ALLOC2
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index e53a1609d7..337c0ac680 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -29,7 +29,6 @@
 #include "qapi/error.h"
 #include "qemu/cutils.h"
 
-#include "block/block_int.h"
 #include "qcow2.h"
 
 /* NOTICE: BME here means Bitmaps Extension and used as a namespace for
diff --git a/block/qcow2-cache.c b/block/qcow2-cache.c
index df02e7b20a..b33bcbc984 100644
--- a/block/qcow2-cache.c
+++ b/block/qcow2-cache.c
@@ -23,7 +23,6 @@
  */
 
 #include "qemu/osdep.h"
-#include "block/block_int.h"
 #include "qemu-common.h"
 #include "qcow2.h"
 #include "trace.h"
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 974a4e8656..c4965479f6 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -27,7 +27,6 @@
 
 #include "qapi/error.h"
 #include "qemu-common.h"
-#include "block/block_int.h"
 #include "qcow2.h"
 #include "qemu/bswap.h"
 #include "trace.h"
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index e0fe322500..ff27b6afd3 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -25,7 +25,6 @@
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "qemu-common.h"
-#include "block/block_int.h"
 #include "qcow2.h"
 #include "qemu/range.h"
 #include "qemu/bswap.h"
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index a6ffae89a6..d0e7fa9311 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -24,7 +24,6 @@
 
 #include "qemu/osdep.h"
 #include "qapi/error.h"
-#include "block/block_int.h"
 #include "qcow2.h"
 #include "qemu/bswap.h"
 #include "qemu/error-report.h"
diff --git a/block/qcow2.c b/block/qcow2.c
index a520d116ef..ab231cbfe7 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -27,7 +27,6 @@
 #define ZLIB_CONST
 #include <zlib.h>
 
-#include "block/block_int.h"
 #include "block/qdict.h"
 #include "sysemu/block-backend.h"
 #include "qemu/module.h"
-- 
2.18.0

[Qemu-devel] [PATCH v6 2/8] qcow2: add separate file for threaded data processing functions

[Vladimir Sementsov-Ogievskiy]

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>
---
 block/qcow2.h         |   7 ++
 block/qcow2-threads.c | 201 ++++++++++++++++++++++++++++++++++++++++++
 block/qcow2.c         | 169 -----------------------------------
 block/Makefile.objs   |   2 +-
 4 files changed, 209 insertions(+), 170 deletions(-)
 create mode 100644 block/qcow2-threads.c

diff --git a/block/qcow2.h b/block/qcow2.h
index ecb026e19a..61079f7ee8 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -735,4 +735,11 @@ 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
diff --git a/block/qcow2-threads.c b/block/qcow2-threads.c
new file mode 100644
index 0000000000..85b8034fd2
--- /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 ab231cbfe7..facf8ab993 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:
@@ -3921,171 +3917,6 @@ 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/Makefile.objs b/block/Makefile.objs
index 7a81892a52..ae11605c9f 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
-- 
2.18.0

[Qemu-devel] [PATCH v6 3/8] qcow2-threads: use thread_pool_submit_co

[Vladimir Sementsov-Ogievskiy]

Use thread_pool_submit_co, instead of reinventing it here. Note, that
thread_pool_submit_aio() never returns NULL, so checking it was an
extra thing.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2-threads.c | 17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/block/qcow2-threads.c b/block/qcow2-threads.c
index 85b8034fd2..5a39fdac69 100644
--- a/block/qcow2-threads.c
+++ b/block/qcow2-threads.c
@@ -144,17 +144,11 @@ static int qcow2_compress_pool_func(void *opaque)
     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,
@@ -169,16 +163,9 @@ qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size,
     }
 
     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();
+    thread_pool_submit_co(pool, qcow2_compress_pool_func, &arg);
     s->nb_compress_threads--;
+
     qemu_co_queue_next(&s->compress_wait_queue);
 
     return arg.ret;
-- 
2.18.0

[Qemu-devel] [PATCH v6 4/8] qcow2-threads: qcow2_co_do_compress: protect queuing by mutex

[Vladimir Sementsov-Ogievskiy]

Drop dependence on AioContext lock.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2-threads.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/block/qcow2-threads.c b/block/qcow2-threads.c
index 5a39fdac69..50a9fdeec5 100644
--- a/block/qcow2-threads.c
+++ b/block/qcow2-threads.c
@@ -158,15 +158,19 @@ qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size,
         .func = func,
     };
 
+    qemu_co_mutex_lock(&s->lock);
     while (s->nb_compress_threads >= MAX_COMPRESS_THREADS) {
-        qemu_co_queue_wait(&s->compress_wait_queue, NULL);
+        qemu_co_queue_wait(&s->compress_wait_queue, &s->lock);
     }
-
     s->nb_compress_threads++;
+    qemu_co_mutex_unlock(&s->lock);
+
     thread_pool_submit_co(pool, qcow2_compress_pool_func, &arg);
-    s->nb_compress_threads--;
 
+    qemu_co_mutex_lock(&s->lock);
+    s->nb_compress_threads--;
     qemu_co_queue_next(&s->compress_wait_queue);
+    qemu_co_mutex_unlock(&s->lock);
 
     return arg.ret;
 }
-- 
2.18.0

[Qemu-devel] [PATCH v6 5/8] qcow2-threads: split out generic path

[Vladimir Sementsov-Ogievskiy]

Move generic part out of qcow2_co_do_compress, to reuse it for
encryption and rename things that would be shared with encryption path.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2.h         |  4 ++--
 block/qcow2-threads.c | 47 ++++++++++++++++++++++++++++---------------
 block/qcow2.c         |  2 +-
 3 files changed, 34 insertions(+), 19 deletions(-)

diff --git a/block/qcow2.h b/block/qcow2.h
index 61079f7ee8..3089e9a68b 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -347,8 +347,8 @@ typedef struct BDRVQcow2State {
     char *image_backing_format;
     char *image_data_file;
 
-    CoQueue compress_wait_queue;
-    int nb_compress_threads;
+    CoQueue thread_task_queue;
+    int nb_threads;
 
     BdrvChild *data_file;
 } BDRVQcow2State;
diff --git a/block/qcow2-threads.c b/block/qcow2-threads.c
index 50a9fdeec5..650aa2ed19 100644
--- a/block/qcow2-threads.c
+++ b/block/qcow2-threads.c
@@ -31,7 +31,36 @@
 #include "qcow2.h"
 #include "block/thread-pool.h"
 
-#define MAX_COMPRESS_THREADS 4
+#define QCOW2_MAX_THREADS 4
+
+static int coroutine_fn
+qcow2_co_process(BlockDriverState *bs, ThreadPoolFunc *func, void *arg)
+{
+    int ret;
+    BDRVQcow2State *s = bs->opaque;
+    ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
+
+    qemu_co_mutex_lock(&s->lock);
+    while (s->nb_threads >= QCOW2_MAX_THREADS) {
+        qemu_co_queue_wait(&s->thread_task_queue, &s->lock);
+    }
+    s->nb_threads++;
+    qemu_co_mutex_unlock(&s->lock);
+
+    ret = thread_pool_submit_co(pool, func, arg);
+
+    qemu_co_mutex_lock(&s->lock);
+    s->nb_threads--;
+    qemu_co_queue_next(&s->thread_task_queue);
+    qemu_co_mutex_unlock(&s->lock);
+
+    return ret;
+}
+
+
+/*
+ * Compression
+ */
 
 typedef ssize_t (*Qcow2CompressFunc)(void *dest, size_t dest_size,
                                      const void *src, size_t src_size);
@@ -148,8 +177,6 @@ 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;
-    ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
     Qcow2CompressData arg = {
         .dest = dest,
         .dest_size = dest_size,
@@ -158,19 +185,7 @@ qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size,
         .func = func,
     };
 
-    qemu_co_mutex_lock(&s->lock);
-    while (s->nb_compress_threads >= MAX_COMPRESS_THREADS) {
-        qemu_co_queue_wait(&s->compress_wait_queue, &s->lock);
-    }
-    s->nb_compress_threads++;
-    qemu_co_mutex_unlock(&s->lock);
-
-    thread_pool_submit_co(pool, qcow2_compress_pool_func, &arg);
-
-    qemu_co_mutex_lock(&s->lock);
-    s->nb_compress_threads--;
-    qemu_co_queue_next(&s->compress_wait_queue);
-    qemu_co_mutex_unlock(&s->lock);
+    qcow2_co_process(bs, qcow2_compress_pool_func, &arg);
 
     return arg.ret;
 }
diff --git a/block/qcow2.c b/block/qcow2.c
index facf8ab993..7970d0992a 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1694,7 +1694,7 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
     }
 #endif
 
-    qemu_co_queue_init(&s->compress_wait_queue);
+    qemu_co_queue_init(&s->thread_task_queue);
 
     return ret;
 
-- 
2.18.0

[Qemu-devel] [PATCH v6 6/8] qcow2: qcow2_co_preadv: improve locking

[Vladimir Sementsov-Ogievskiy]

Background: decryption will be done in threads, to take benefit of it,
we should move it out of the lock first.

But let's go further: it turns out, that only
qcow2_get_cluster_offset() needs locking, so reduce locking to it.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 block/qcow2.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/block/qcow2.c b/block/qcow2.c
index 7970d0992a..5954696245 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1970,8 +1970,6 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
 
     qemu_iovec_init(&hd_qiov, qiov->niov);
 
-    qemu_co_mutex_lock(&s->lock);
-
     while (bytes != 0) {
 
         /* prepare next request */
@@ -1981,7 +1979,9 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
                             QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size);
         }
 
+        qemu_co_mutex_lock(&s->lock);
         ret = qcow2_get_cluster_offset(bs, offset, &cur_bytes, &cluster_offset);
+        qemu_co_mutex_unlock(&s->lock);
         if (ret < 0) {
             goto fail;
         }
@@ -1996,10 +1996,8 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
 
             if (bs->backing) {
                 BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
-                qemu_co_mutex_unlock(&s->lock);
                 ret = bdrv_co_preadv(bs->backing, offset, cur_bytes,
                                      &hd_qiov, 0);
-                qemu_co_mutex_lock(&s->lock);
                 if (ret < 0) {
                     goto fail;
                 }
@@ -2015,11 +2013,9 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
             break;
 
         case QCOW2_CLUSTER_COMPRESSED:
-            qemu_co_mutex_unlock(&s->lock);
             ret = qcow2_co_preadv_compressed(bs, cluster_offset,
                                              offset, cur_bytes,
                                              &hd_qiov);
-            qemu_co_mutex_lock(&s->lock);
             if (ret < 0) {
                 goto fail;
             }
@@ -2056,11 +2052,9 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
             }
 
             BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
-            qemu_co_mutex_unlock(&s->lock);
             ret = bdrv_co_preadv(s->data_file,
                                  cluster_offset + offset_in_cluster,
                                  cur_bytes, &hd_qiov, 0);
-            qemu_co_mutex_lock(&s->lock);
             if (ret < 0) {
                 goto fail;
             }
@@ -2095,8 +2089,6 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
     ret = 0;
 
 fail:
-    qemu_co_mutex_unlock(&s->lock);
-
     qemu_iovec_destroy(&hd_qiov);
     qemu_vfree(cluster_data);
 
-- 
2.18.0

[Qemu-devel] [PATCH v6 7/8] qcow2: bdrv_co_pwritev: move encryption code out of the lock

[Vladimir Sementsov-Ogievskiy]

Encryption will be done in threads, to take benefit of it, we should
move it out of the lock first.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2.c | 35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/block/qcow2.c b/block/qcow2.c
index 5954696245..cba2328005 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2169,11 +2169,20 @@ static coroutine_fn int qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset,
         ret = qcow2_alloc_cluster_offset(bs, offset, &cur_bytes,
                                          &cluster_offset, &l2meta);
         if (ret < 0) {
-            goto fail;
+            goto out_locked;
         }
 
         assert((cluster_offset & 511) == 0);
 
+        ret = qcow2_pre_write_overlap_check(bs, 0,
+                                            cluster_offset + offset_in_cluster,
+                                            cur_bytes, true);
+        if (ret < 0) {
+            goto out_locked;
+        }
+
+        qemu_co_mutex_unlock(&s->lock);
+
         qemu_iovec_reset(&hd_qiov);
         qemu_iovec_concat(&hd_qiov, qiov, bytes_done, cur_bytes);
 
@@ -2185,7 +2194,7 @@ static coroutine_fn int qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset,
                                                    * s->cluster_size);
                 if (cluster_data == NULL) {
                     ret = -ENOMEM;
-                    goto fail;
+                    goto out_unlocked;
                 }
             }
 
@@ -2200,40 +2209,34 @@ static coroutine_fn int qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset,
                                       cluster_data,
                                       cur_bytes, NULL) < 0) {
                 ret = -EIO;
-                goto fail;
+                goto out_unlocked;
             }
 
             qemu_iovec_reset(&hd_qiov);
             qemu_iovec_add(&hd_qiov, cluster_data, cur_bytes);
         }
 
-        ret = qcow2_pre_write_overlap_check(bs, 0,
-                cluster_offset + offset_in_cluster, cur_bytes, true);
-        if (ret < 0) {
-            goto fail;
-        }
-
         /* If we need to do COW, check if it's possible to merge the
          * writing of the guest data together with that of the COW regions.
          * If it's not possible (or not necessary) then write the
          * guest data now. */
         if (!merge_cow(offset, cur_bytes, &hd_qiov, l2meta)) {
-            qemu_co_mutex_unlock(&s->lock);
             BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
             trace_qcow2_writev_data(qemu_coroutine_self(),
                                     cluster_offset + offset_in_cluster);
             ret = bdrv_co_pwritev(s->data_file,
                                   cluster_offset + offset_in_cluster,
                                   cur_bytes, &hd_qiov, 0);
-            qemu_co_mutex_lock(&s->lock);
             if (ret < 0) {
-                goto fail;
+                goto out_unlocked;
             }
         }
 
+        qemu_co_mutex_lock(&s->lock);
+
         ret = qcow2_handle_l2meta(bs, &l2meta, true);
         if (ret) {
-            goto fail;
+            goto out_locked;
         }
 
         bytes -= cur_bytes;
@@ -2242,8 +2245,12 @@ static coroutine_fn int qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset,
         trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_bytes);
     }
     ret = 0;
+    goto out_locked;
 
-fail:
+out_unlocked:
+    qemu_co_mutex_lock(&s->lock);
+
+out_locked:
     qcow2_handle_l2meta(bs, &l2meta, false);
 
     qemu_co_mutex_unlock(&s->lock);
-- 
2.18.0

[Qemu-devel] [PATCH v6 8/8] qcow2: do encryption in threads

[Vladimir Sementsov-Ogievskiy]

Do encryption/decryption in threads, like it is already done for
compression. This improves asynchronous encrypted io.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2.h         |  8 ++++++
 block/qcow2-cluster.c |  7 ++---
 block/qcow2-threads.c | 65 +++++++++++++++++++++++++++++++++++++++++--
 block/qcow2.c         | 22 +++++----------
 4 files changed, 81 insertions(+), 21 deletions(-)

diff --git a/block/qcow2.h b/block/qcow2.h
index 3089e9a68b..5169c0d8ab 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -264,6 +264,8 @@ typedef struct Qcow2BitmapHeaderExt {
     uint64_t bitmap_directory_offset;
 } QEMU_PACKED Qcow2BitmapHeaderExt;
 
+#define QCOW2_MAX_THREADS 4
+
 typedef struct BDRVQcow2State {
     int cluster_bits;
     int cluster_size;
@@ -741,5 +743,11 @@ qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size,
 ssize_t coroutine_fn
 qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size,
                     const void *src, size_t src_size);
+int coroutine_fn
+qcow2_co_encrypt(BlockDriverState *bs, uint64_t file_cluster_offset,
+                 uint64_t offset, void *buf, size_t len);
+int coroutine_fn
+qcow2_co_decrypt(BlockDriverState *bs, uint64_t file_cluster_offset,
+                 uint64_t offset, void *buf, size_t len);
 
 #endif
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index c4965479f6..e6624c6e4e 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -471,13 +471,12 @@ static bool coroutine_fn do_perform_cow_encrypt(BlockDriverState *bs,
 {
     if (bytes && bs->encrypted) {
         BDRVQcow2State *s = bs->opaque;
-        int64_t offset = (s->crypt_physical_offset ?
-                          (cluster_offset + offset_in_cluster) :
-                          (src_cluster_offset + offset_in_cluster));
         assert((offset_in_cluster & ~BDRV_SECTOR_MASK) == 0);
         assert((bytes & ~BDRV_SECTOR_MASK) == 0);
         assert(s->crypto);
-        if (qcrypto_block_encrypt(s->crypto, offset, buffer, bytes, NULL) < 0) {
+        if (qcow2_co_encrypt(bs, cluster_offset,
+                             src_cluster_offset + offset_in_cluster,
+                             buffer, bytes) < 0) {
             return false;
         }
     }
diff --git a/block/qcow2-threads.c b/block/qcow2-threads.c
index 650aa2ed19..3b1e63fe41 100644
--- a/block/qcow2-threads.c
+++ b/block/qcow2-threads.c
@@ -30,8 +30,7 @@
 
 #include "qcow2.h"
 #include "block/thread-pool.h"
-
-#define QCOW2_MAX_THREADS 4
+#include "crypto.h"
 
 static int coroutine_fn
 qcow2_co_process(BlockDriverState *bs, ThreadPoolFunc *func, void *arg)
@@ -205,3 +204,65 @@ qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size,
     return qcow2_co_do_compress(bs, dest, dest_size, src, src_size,
                                 qcow2_decompress);
 }
+
+
+/*
+ * Cryptography
+ */
+
+/*
+ * Qcow2EncDecFunc: common prototype of qcrypto_block_encrypt() and
+ * qcrypto_block_decrypt() functions.
+ */
+typedef int (*Qcow2EncDecFunc)(QCryptoBlock *block, uint64_t offset,
+                               uint8_t *buf, size_t len, Error **errp);
+
+typedef struct Qcow2EncDecData {
+    QCryptoBlock *block;
+    uint64_t offset;
+    uint8_t *buf;
+    size_t len;
+
+    Qcow2EncDecFunc func;
+} Qcow2EncDecData;
+
+static int qcow2_encdec_pool_func(void *opaque)
+{
+    Qcow2EncDecData *data = opaque;
+
+    return data->func(data->block, data->offset, data->buf, data->len, NULL);
+}
+
+static int coroutine_fn
+qcow2_co_encdec(BlockDriverState *bs, uint64_t file_cluster_offset,
+                  uint64_t offset, void *buf, size_t len, Qcow2EncDecFunc func)
+{
+    BDRVQcow2State *s = bs->opaque;
+    Qcow2EncDecData arg = {
+        .block = s->crypto,
+        .offset = s->crypt_physical_offset ?
+                      file_cluster_offset + offset_into_cluster(s, offset) :
+                      offset,
+        .buf = buf,
+        .len = len,
+        .func = func,
+    };
+
+    return qcow2_co_process(bs, qcow2_encdec_pool_func, &arg);
+}
+
+int coroutine_fn
+qcow2_co_encrypt(BlockDriverState *bs, uint64_t file_cluster_offset,
+                 uint64_t offset, void *buf, size_t len)
+{
+    return qcow2_co_encdec(bs, file_cluster_offset, offset, buf, len,
+                             qcrypto_block_encrypt);
+}
+
+int coroutine_fn
+qcow2_co_decrypt(BlockDriverState *bs, uint64_t file_cluster_offset,
+                 uint64_t offset, void *buf, size_t len)
+{
+    return qcow2_co_encdec(bs, file_cluster_offset, offset, buf, len,
+                             qcrypto_block_decrypt);
+}
diff --git a/block/qcow2.c b/block/qcow2.c
index cba2328005..dee3b8cca3 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -297,7 +297,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
             }
             s->crypto = qcrypto_block_open(s->crypto_opts, "encrypt.",
                                            qcow2_crypto_hdr_read_func,
-                                           bs, cflags, 1, errp);
+                                           bs, cflags, QCOW2_MAX_THREADS, errp);
             if (!s->crypto) {
                 return -EINVAL;
             }
@@ -1539,7 +1539,8 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
                 cflags |= QCRYPTO_BLOCK_OPEN_NO_IO;
             }
             s->crypto = qcrypto_block_open(s->crypto_opts, "encrypt.",
-                                           NULL, NULL, cflags, 1, errp);
+                                           NULL, NULL, cflags,
+                                           QCOW2_MAX_THREADS, errp);
             if (!s->crypto) {
                 ret = -EINVAL;
                 goto fail;
@@ -2062,13 +2063,8 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
                 assert(s->crypto);
                 assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
                 assert((cur_bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
-                if (qcrypto_block_decrypt(s->crypto,
-                                          (s->crypt_physical_offset ?
-                                           cluster_offset + offset_in_cluster :
-                                           offset),
-                                          cluster_data,
-                                          cur_bytes,
-                                          NULL) < 0) {
+                if (qcow2_co_decrypt(bs, cluster_offset, offset,
+                                     cluster_data, cur_bytes) < 0) {
                     ret = -EIO;
                     goto fail;
                 }
@@ -2202,12 +2198,8 @@ static coroutine_fn int qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset,
                    QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size);
             qemu_iovec_to_buf(&hd_qiov, 0, cluster_data, hd_qiov.size);
 
-            if (qcrypto_block_encrypt(s->crypto,
-                                      (s->crypt_physical_offset ?
-                                       cluster_offset + offset_in_cluster :
-                                       offset),
-                                      cluster_data,
-                                      cur_bytes, NULL) < 0) {
+            if (qcow2_co_encrypt(bs, cluster_offset, offset,
+                                 cluster_data, cur_bytes) < 0) {
                 ret = -EIO;
                 goto out_unlocked;
             }
-- 
2.18.0

Re: [Qemu-devel] [PATCH v6 6/8] qcow2: qcow2_co_preadv: improve locking

[Alberto Garcia]

On Mon 06 May 2019 04:27:39 PM CEST, Vladimir Sementsov-Ogievskiy wrote:
> Background: decryption will be done in threads, to take benefit of it,
> we should move it out of the lock first.
>
> But let's go further: it turns out, that only
> qcow2_get_cluster_offset() needs locking, so reduce locking to it.
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Reviewed-by: Alberto Garcia <berto@igalia.com>

Berto

Re: [Qemu-devel] [PATCH v6 0/8] qcow2: encryption threads

[Max Reitz]

[-- Attachment #1: Type: text/plain, Size: 1609 bytes --]

On 06.05.19 16:27, Vladimir Sementsov-Ogievskiy wrote:
> v6:
>  - Rebase on master, so 02 changed to reflect changes in
>    qcow2_compress(), keep r-b.
>  - Rewrite 06 to even simpler locking [Max], drop r-b
>    Drop following
>    "qcow2: qcow2_co_preadv: skip using hd_qiov when possible", I'll do
>    it in my other coming soon series, and it is actually unrelated to
>    current.
>  - Drop controversial perf test, hope I'll return to this topic, but not
>    in context of these series.
>  - Add Max's r-b's to all here, except 06
> 
> Vladimir Sementsov-Ogievskiy (8):
>   qcow2.h: add missing include
>   qcow2: add separate file for threaded data processing functions
>   qcow2-threads: use thread_pool_submit_co
>   qcow2-threads: qcow2_co_do_compress: protect queuing by mutex
>   qcow2-threads: split out generic path
>   qcow2: qcow2_co_preadv: improve locking
>   qcow2: bdrv_co_pwritev: move encryption code out of the lock
>   qcow2: do encryption in threads
> 
>  block/qcow2.h          |  20 ++-
>  block/qcow2-bitmap.c   |   1 -
>  block/qcow2-cache.c    |   1 -
>  block/qcow2-cluster.c  |   8 +-
>  block/qcow2-refcount.c |   1 -
>  block/qcow2-snapshot.c |   1 -
>  block/qcow2-threads.c  | 268 +++++++++++++++++++++++++++++++++++++++++
>  block/qcow2.c          | 241 +++++-------------------------------
>  block/Makefile.objs    |   2 +-
>  9 files changed, 321 insertions(+), 222 deletions(-)
>  create mode 100644 block/qcow2-threads.c

Thanks, applied to my block branch:

https://git.xanclic.moe/XanClic/qemu/commits/branch/block

Max


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Re: [Qemu-devel] [PATCH v6 0/8] qcow2: encryption threads

[Vladimir Sementsov-Ogievskiy]

09.05.2019 17:56, Max Reitz wrote:
> On 06.05.19 16:27, Vladimir Sementsov-Ogievskiy wrote:
>> v6:
>>   - Rebase on master, so 02 changed to reflect changes in
>>     qcow2_compress(), keep r-b.
>>   - Rewrite 06 to even simpler locking [Max], drop r-b
>>     Drop following
>>     "qcow2: qcow2_co_preadv: skip using hd_qiov when possible", I'll do
>>     it in my other coming soon series, and it is actually unrelated to
>>     current.
>>   - Drop controversial perf test, hope I'll return to this topic, but not
>>     in context of these series.
>>   - Add Max's r-b's to all here, except 06
>>
>> Vladimir Sementsov-Ogievskiy (8):
>>    qcow2.h: add missing include
>>    qcow2: add separate file for threaded data processing functions
>>    qcow2-threads: use thread_pool_submit_co
>>    qcow2-threads: qcow2_co_do_compress: protect queuing by mutex
>>    qcow2-threads: split out generic path
>>    qcow2: qcow2_co_preadv: improve locking
>>    qcow2: bdrv_co_pwritev: move encryption code out of the lock
>>    qcow2: do encryption in threads
>>
>>   block/qcow2.h          |  20 ++-
>>   block/qcow2-bitmap.c   |   1 -
>>   block/qcow2-cache.c    |   1 -
>>   block/qcow2-cluster.c  |   8 +-
>>   block/qcow2-refcount.c |   1 -
>>   block/qcow2-snapshot.c |   1 -
>>   block/qcow2-threads.c  | 268 +++++++++++++++++++++++++++++++++++++++++
>>   block/qcow2.c          | 241 +++++-------------------------------
>>   block/Makefile.objs    |   2 +-
>>   9 files changed, 321 insertions(+), 222 deletions(-)
>>   create mode 100644 block/qcow2-threads.c
> 
> Thanks, applied to my block branch:
> 
> https://git.xanclic.moe/XanClic/qemu/commits/branch/block
> 

Thank you!!


-- 
Best regards,
Vladimir