Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging
[qemu.git] / util / aiocb.c
1 /*
2 * BlockAIOCB allocation
3 *
4 * Copyright (c) 2003-2017 Fabrice Bellard and other QEMU contributors
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "block/aio.h"
27
28 void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs,
29 BlockCompletionFunc *cb, void *opaque)
30 {
31 BlockAIOCB *acb;
32
33 acb = g_malloc(aiocb_info->aiocb_size);
34 acb->aiocb_info = aiocb_info;
35 acb->bs = bs;
36 acb->cb = cb;
37 acb->opaque = opaque;
38 acb->refcnt = 1;
39 return acb;
40 }
41
42 void qemu_aio_ref(void *p)
43 {
44 BlockAIOCB *acb = p;
45 acb->refcnt++;
46 }
47
48 void qemu_aio_unref(void *p)
49 {
50 BlockAIOCB *acb = p;
51 assert(acb->refcnt > 0);
52 if (--acb->refcnt == 0) {
53 g_free(acb);
54 }
55 }