[Qemu-devel] [PATCH V14 01/13] quorum: Create quorum.c, add QuorumSingleAIOCB and QuorumAIOCB.

["Benoît Canet" <benoit.canet@irqsave.net>]

From: Benoît Canet <benoit@irqsave.net>

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/Makefile.objs |  1 +
 block/quorum.c      | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 block/quorum.c

diff --git a/block/Makefile.objs b/block/Makefile.objs
index 4e8c91e..a2650b9 100644
--- a/block/Makefile.objs
+++ b/block/Makefile.objs
@@ -3,6 +3,7 @@ block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-c
 block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o
 block-obj-y += qed-check.o
 block-obj-$(CONFIG_VHDX) += vhdx.o vhdx-endian.o vhdx-log.o
+block-obj-y += quorum.o
 block-obj-y += parallels.o blkdebug.o blkverify.o
 block-obj-y += snapshot.o qapi.o
 block-obj-$(CONFIG_WIN32) += raw-win32.o win32-aio.o
diff --git a/block/quorum.c b/block/quorum.c
new file mode 100644
index 0000000..17695d6
--- /dev/null
+++ b/block/quorum.c
@@ -0,0 +1,54 @@
+/*
+ * Quorum Block filter
+ *
+ * Copyright (C) 2012-2014 Nodalink, EURL.
+ *
+ * Author:
+ *   Benoît Canet <benoit.canet@irqsave.net>
+ *
+ * Based on the design and code of blkverify.c (Copyright (C) 2010 IBM, Corp)
+ * and blkmirror.c (Copyright (C) 2011 Red Hat, Inc).
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "block/block_int.h"
+
+typedef struct QuorumAIOCB QuorumAIOCB;
+
+/* Quorum will create one instance of the following structure per operation it
+ * performs on its children.
+ * So for each read/write operation coming from the upper layer there will be
+ * $children_count QuorumSingleAIOCB.
+ */
+typedef struct QuorumSingleAIOCB {
+    BlockDriverAIOCB *aiocb;
+    QEMUIOVector qiov;
+    uint8_t *buf;
+    int ret;
+    QuorumAIOCB *parent;
+} QuorumSingleAIOCB;
+
+/* Quorum will use the following structure to track progress of each read/write
+ * operation received by the upper layer.
+ * This structure hold pointers to the QuorumSingleAIOCB structures instances
+ * used to do operations on each children and track overall progress.
+ */
+struct QuorumAIOCB {
+    BlockDriverAIOCB common;
+
+    /* Request metadata */
+    uint64_t sector_num;
+    int nb_sectors;
+
+    QEMUIOVector *qiov;         /* calling IOV */
+
+    QuorumSingleAIOCB *aios;    /* individual AIOs */
+    int count;                  /* number of completed AIOCB */
+    int success_count;          /* number of successfully completed AIOCB */
+    bool *finished;             /* completion signal for cancel */
+
+    bool is_read;
+    int vote_ret;
+};
-- 
1.8.3.2