aiocb.c (1782B)
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 }