From 27cec15e4ed4e69155f2499ceb46d22d8425102a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Beno=C3=AEt=20Canet?= Date: Fri, 21 Feb 2014 22:21:10 +0100 Subject: quorum: Create quorum.c, add QuorumChildRequest and QuorumAIOCB. Quorum is a block filter mirroring writes to num_children children. For reads quorum reads each children and does a vote. If more than vote_threshold versions are identical the quorum is reached and this winning version is returned to the guest. So quorum prevents bit corruption. For high availability purpose minority errors are reported via QMP but the guest does not see them. This patch creates the driver C source file and introduces the structures that will be used in asynchronous reads and writes. Signed-off-by: Benoit Canet Reviewed-by: Max Reitz Signed-off-by: Kevin Wolf --- block/Makefile.objs | 1 + 1 file changed, 1 insertion(+) (limited to 'block/Makefile.objs') diff --git a/block/Makefile.objs b/block/Makefile.objs index e254a2180a..716556f6ec 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 -- cgit v1.2.1 From 95c6bff3561eedaf7c7de287bc4a002720605a8d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Beno=C3=AEt=20Canet?= Date: Fri, 21 Feb 2014 22:21:15 +0100 Subject: quorum: Add quorum mechanism. This patchset enables the core of the quorum mechanism. The num_children reads are compared to get the majority version and if this version exists more than threshold times the guest won't see the error at all. If a block is corrupted or if an error occurs during an IO or if the quorum cannot be established QMP events are used to report to the management. Use gnutls's SHA-256 to compare versions. --enable-quorum must be used to enable the feature. Signed-off-by: Benoit Canet Reviewed-by: Max Reitz Signed-off-by: Kevin Wolf --- block/Makefile.objs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'block/Makefile.objs') diff --git a/block/Makefile.objs b/block/Makefile.objs index 716556f6ec..425d7fbb59 100644 --- a/block/Makefile.objs +++ b/block/Makefile.objs @@ -3,7 +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-$(CONFIG_VHDX) += vhdx.o vhdx-endian.o vhdx-log.o -block-obj-y += quorum.o +block-obj-$(CONFIG_QUORUM) += 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 -- cgit v1.2.1