LXR qemu/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
  28void *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
  42void qemu_aio_ref(void *p)
  43{
  44    BlockAIOCB *acb = p;
  45    acb->refcnt++;
  46}
  47
  48void 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