They will be used for backup.
Signed-off-by: Vladimir Sementsov-Ogievskiy <[email protected]>
---
include/block/block-copy.h | 5 +++++
block/block-copy.c | 10 ++++++++--
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/include/block/block-copy.h b/include/block/block-copy.h
index ada0d99566..600984c733 100644
--- a/include/block/block-copy.h
+++ b/include/block/block-copy.h
@@ -47,6 +47,11 @@ int coroutine_fn block_copy(BlockCopyState *s, int64_t
offset, int64_t bytes,
/*
* Run block-copy in a coroutine, return state pointer. If finished early
* returns NULL (@cb is called anyway).
+ *
+ * @max_workers means maximum of parallel coroutines to execute sub-requests,
+ * must be > 0.
+ *
+ * @max_chunk means maximum length for one IO operation. Zero means unlimited.
*/
BlockCopyCallState *block_copy_async(BlockCopyState *s,
int64_t offset, int64_t bytes,
diff --git a/block/block-copy.c b/block/block-copy.c
index a0477d90f3..4114d1fd25 100644
--- a/block/block-copy.c
+++ b/block/block-copy.c
@@ -34,6 +34,8 @@ typedef struct BlockCopyCallState {
BlockCopyState *s;
int64_t offset;
int64_t bytes;
+ int max_workers;
+ int64_t max_chunk;
BlockCopyAsyncCallbackFunc cb;
/* State */
@@ -144,10 +146,11 @@ static BlockCopyTask
*block_copy_task_create(BlockCopyState *s,
int64_t offset, int64_t bytes)
{
BlockCopyTask *task;
+ int64_t max_chunk = MIN_NON_ZERO(s->copy_size, call_state->max_chunk);
if (!bdrv_dirty_bitmap_next_dirty_area(s->copy_bitmap,
offset, offset + bytes,
- s->copy_size, &offset, &bytes))
+ max_chunk, &offset, &bytes))
{
return NULL;
}
@@ -616,7 +619,7 @@ block_copy_dirty_clusters(BlockCopyCallState *call_state)
bytes = end - offset;
if (!aio && bytes) {
- aio = aio_task_pool_new(BLOCK_COPY_MAX_WORKERS);
+ aio = aio_task_pool_new(call_state->max_workers);
}
ret = block_copy_task_run(aio, task);
@@ -695,6 +698,7 @@ int coroutine_fn block_copy(BlockCopyState *s, int64_t
start, int64_t bytes,
.s = s,
.offset = start,
.bytes = bytes,
+ .max_workers = BLOCK_COPY_MAX_WORKERS,
};
int ret = block_copy_common(&call_state);
@@ -726,6 +730,8 @@ BlockCopyCallState *block_copy_async(BlockCopyState *s,
.offset = offset,
.bytes = bytes,
.cb = cb,
+ .max_workers = max_workers ?: BLOCK_COPY_MAX_WORKERS,
+ .max_chunk = max_chunk,
};
qemu_coroutine_enter(co);
--
2.21.0
