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block-copy: atomic .cancelled and .finished fields in BlockCopyCallState

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By adding acquire/release pairs, we ensure that .ret and .error_is_read
fields are written by block_copy_dirty_clusters before .finished is true,
and that they are read by API user after .finished is true.

The atomic here are necessary because the fields are concurrently modified
in coroutines, and read outside.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20210624072043.180494-6-eesposit@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2021-06-24 09:20:43 +02:00 • committed by Vladimir Sementsov-Ogievskiy
parent d0c389d2ce
commit 149009bef4
2 changed files with 24 additions and 15 deletions
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2
include/block/block-copy.h
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@ -18,6 +18,8 @@
#include "block/block.h"
#include "qemu/co-shared-resource.h"
/* All APIs are thread-safe */
typedef void (*BlockCopyAsyncCallbackFunc)(void *opaque);
typedef struct BlockCopyState BlockCopyState;
typedef struct BlockCopyCallState BlockCopyCallState;