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block: Add refcnt in BlockDriverAIOCB 

This will be useful in synchronous cancel emulation with
bdrv_aio_cancel_async.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Fam Zheng 2014-09-11 13:41:08 +08:00 committed by Stefan Hajnoczi
parent 0d910cfeaf
commit f197fe2b2c
2 changed files with 13 additions and 1 deletions
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10
block.c
View File

@ -4891,13 +4891,23 @@ void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs,
acb->bs = bs;
acb->cb = cb;
acb->opaque = opaque;
acb->refcnt = 1;
return acb;
}
void qemu_aio_ref(void *p)
{
BlockDriverAIOCB *acb = p;
acb->refcnt++;
}
void qemu_aio_release(void *p)
{
BlockDriverAIOCB *acb = p;
assert(acb->refcnt > 0);
if (--acb->refcnt == 0) {
g_slice_free1(acb->aiocb_info->aiocb_size, acb);
}
}
/**************************************************************/

2
include/block/aio.h
View File

@ -35,11 +35,13 @@ struct BlockDriverAIOCB {
BlockDriverState *bs;
BlockDriverCompletionFunc *cb;
void *opaque;
int refcnt;
};
void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque);
void qemu_aio_release(void *p);
void qemu_aio_ref(void *p);
typedef struct AioHandler AioHandler;
typedef void QEMUBHFunc(void *opaque);