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[Qemu-devel] [PATCH v3 1/8] block: Add refcnt in BlockDriverAIOCB
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH v3 1/8] block: Add refcnt in BlockDriverAIOCB |
Date: |
Wed, 27 Aug 2014 10:49:09 +0800 |
This will be useful in situations like asynchronous cancel emulation.
Signed-off-by: Fam Zheng <address@hidden>
---
block.c | 12 +++++++++++-
include/block/aio.h | 2 ++
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/block.c b/block.c
index e9380f6..f8e342f 100644
--- a/block.c
+++ b/block.c
@@ -4860,13 +4860,23 @@ 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;
- g_slice_free1(acb->aiocb_info->aiocb_size, acb);
+ assert(acb->refcnt > 0);
+ if (--acb->refcnt == 0) {
+ g_slice_free1(acb->aiocb_info->aiocb_size, acb);
+ }
}
/**************************************************************/
diff --git a/include/block/aio.h b/include/block/aio.h
index c23de3c..8c216f6 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -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);
--
2.1.0
- [Qemu-devel] [PATCH v3 0/8] block: Asynchronous request cancellation, Fam Zheng, 2014/08/26
- [Qemu-devel] [PATCH v3 1/8] block: Add refcnt in BlockDriverAIOCB,
Fam Zheng <=
- [Qemu-devel] [PATCH v3 2/8] block: Add bdrv_aio_cancel_async, Fam Zheng, 2014/08/26
- [Qemu-devel] [PATCH v3 3/8] tests: Add testing code for bdrv_aio_cancel_async, Fam Zheng, 2014/08/26
- [Qemu-devel] [PATCH v3 5/8] thread-pool: Implement .cancel_async, Fam Zheng, 2014/08/26
- [Qemu-devel] [PATCH v3 4/8] linux-aio: Implement .cancel_async, Fam Zheng, 2014/08/26
- [Qemu-devel] [PATCH v3 6/8] dma: Implement .cancel_async, Fam Zheng, 2014/08/26
- [Qemu-devel] [PATCH v3 7/8] block: Implement bdrv_em_co_aiocb_info.cancel_async, Fam Zheng, 2014/08/26
- [Qemu-devel] [PATCH v3 8/8] iscsi: Implement .cancel_async in acb info, Fam Zheng, 2014/08/26