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From a77029a7a8885902edbc0034c15c2a609a1093ba Mon Sep 17 00:00:00 2001
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Message-Id: <a77029a7a8885902edbc0034c15c2a609a1093ba@dist-git>
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From: Peter Krempa <pkrempa@redhat.com>
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Date: Thu, 23 Nov 2017 19:02:18 +0100
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Subject: [PATCH] qemu: block: Add function to check if storage source allows
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concurrent access
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Storage source format backing a shared device (e.g. running a cluster
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filesystem) needs to support the sharing so that metadata are not
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corrupted. Add a central function for checking this.
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(cherry picked from commit 1fc3cd8731640aefc48bbd9fc489f21cb99c6f67)
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Conflicts:
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src/qemu/qemu_block.c: context of one of the blockdev-add saga
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refactors not being backported
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https://bugzilla.redhat.com/show_bug.cgi?id=1511480
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/qemu/qemu_block.c | 15 +++++++++++++++
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src/qemu/qemu_block.h | 3 +++
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2 files changed, 18 insertions(+)
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diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
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index 0761f89913..86fa565f39 100644
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--- a/src/qemu/qemu_block.c
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+++ b/src/qemu/qemu_block.c
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@@ -390,6 +390,21 @@ qemuBlockGetNodeData(virJSONValuePtr data)
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}
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+/**
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+ * qemuBlockStorageSourceSupportsConcurrentAccess:
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+ * @src: disk storage source
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+ *
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+ * Returns true if the given storage format supports concurrent access from two
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+ * separate processes.
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+ */
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+bool
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+qemuBlockStorageSourceSupportsConcurrentAccess(virStorageSourcePtr src)
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+{
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+ /* no need to check in backing chain since only RAW storage supports this */
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+ return src->format == VIR_STORAGE_FILE_RAW;
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+}
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+
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+
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/**
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* qemuBlockStorageSourceBuildJSONSocketAddress
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* @host: the virStorageNetHostDefPtr definition to build
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diff --git a/src/qemu/qemu_block.h b/src/qemu/qemu_block.h
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index f0a2c9aa7d..ebf3149ce8 100644
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--- a/src/qemu/qemu_block.h
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+++ b/src/qemu/qemu_block.h
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@@ -53,6 +53,9 @@ qemuBlockNodeNamesDetect(virQEMUDriverPtr driver,
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virHashTablePtr
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qemuBlockGetNodeData(virJSONValuePtr data);
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+bool
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+qemuBlockStorageSourceSupportsConcurrentAccess(virStorageSourcePtr src);
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+
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virJSONValuePtr
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qemuBlockStorageSourceGetBackendProps(virStorageSourcePtr src);
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--
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2.15.0
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