From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48895) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XM9vT-0006mR-0y for qemu-devel@nongnu.org; Tue, 26 Aug 2014 02:08:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XM9vM-0003IN-Sr for qemu-devel@nongnu.org; Tue, 26 Aug 2014 02:08:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39176) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XM9vM-0003IH-LA for qemu-devel@nongnu.org; Tue, 26 Aug 2014 02:08:08 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s7Q687MI005375 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Tue, 26 Aug 2014 02:08:08 -0400 From: Fam Zheng Date: Tue, 26 Aug 2014 14:08:11 +0800 Message-Id: <1409033298-5720-2-git-send-email-famz@redhat.com> In-Reply-To: <1409033298-5720-1-git-send-email-famz@redhat.com> References: <1409033298-5720-1-git-send-email-famz@redhat.com> Subject: [Qemu-devel] [RFC PATCH v2 1/8] block: Add refcnt in BlockDriverAIOCB List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Kevin Wolf , Paolo Bonzini , Stefan Hajnoczi This will be useful in situations like asynchronous cancel emulation. Signed-off-by: Fam Zheng --- 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