mirror of https://gitee.com/openkylin/qemu.git
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
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/*
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* Quorum Block filter
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*
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* Copyright (C) 2012-2014 Nodalink, EURL.
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*
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* Author:
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* Benoît Canet <benoit.canet@irqsave.net>
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*
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* Based on the design and code of blkverify.c (Copyright (C) 2010 IBM, Corp)
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* and blkmirror.c (Copyright (C) 2011 Red Hat, Inc).
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "block/block_int.h"
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typedef struct QuorumAIOCB QuorumAIOCB;
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/* Quorum will create one instance of the following structure per operation it
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* performs on its children.
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* So for each read/write operation coming from the upper layer there will be
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* $children_count QuorumChildRequest.
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*/
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typedef struct QuorumChildRequest {
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BlockDriverAIOCB *aiocb;
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QEMUIOVector qiov;
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uint8_t *buf;
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int ret;
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QuorumAIOCB *parent;
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} QuorumChildRequest;
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/* Quorum will use the following structure to track progress of each read/write
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* operation received by the upper layer.
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* This structure hold pointers to the QuorumChildRequest structures instances
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* used to do operations on each children and track overall progress.
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*/
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struct QuorumAIOCB {
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BlockDriverAIOCB common;
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/* Request metadata */
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uint64_t sector_num;
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int nb_sectors;
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QEMUIOVector *qiov; /* calling IOV */
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QuorumChildRequest *qcrs; /* individual child requests */
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int count; /* number of completed AIOCB */
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int success_count; /* number of successfully completed AIOCB */
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bool is_read;
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int vote_ret;
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};
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