qemu

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
}
56