[PATCH 1/9] virstoragefile: Add virStorageSourceGetBackingStore

[Matthias Gatto <matthias.gatto@xxxxxxxxxxxx>]

Create virStorageSourceGetBackingStore function in
preparation for quorum:
Actually, if we want to get a backing store inside a virStorageSource
we have to do it manually(src->backingStore = backingStore).
The problem is that with a quorum, a virStorageSource
can contain multiple backing stores, and src->backingStore can
be treated as a virStorageSourcePtr or a virStorageSourcePtrPtr.

Due to these reason, we need to simplify the manipulation of
virStorageSource, and create a function to get the asked
backingStore in a virStorageSource

For now, this function only return the backingStore field

Signed-off-by: Matthias Gatto <matthias.gatto@xxxxxxxxxxxx>
---
 src/libvirt_private.syms  | 1 +
 src/util/virstoragefile.c | 8 ++++++++
 src/util/virstoragefile.h | 3 +++
 3 files changed, 12 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 1853a9c..12dd399 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1992,6 +1992,7 @@ virStorageSourceClear;
 virStorageSourceCopy;
 virStorageSourceFree;
 virStorageSourceGetActualType;
+virStorageSourceGetBackingStore;
 virStorageSourceGetSecurityLabelDef;
 virStorageSourceInitChainElement;
 virStorageSourceIsEmpty;
diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index c424251..ebcf7c3 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -1814,6 +1814,14 @@ virStorageSourcePoolDefCopy(const virStorageSourcePoolDef *src)
 }
 
 
+virStorageSourcePtr
+virStorageSourceGetBackingStore(const virStorageSource *src,
+                                size_t pos ATTRIBUTE_UNUSED)
+{
+    return src->backingStore;
+}
+
+
 /**
  * virStorageSourcePtr:
  *
diff --git a/src/util/virstoragefile.h b/src/util/virstoragefile.h
index e05b843..fe07dde 100644
--- a/src/util/virstoragefile.h
+++ b/src/util/virstoragefile.h
@@ -288,6 +288,9 @@ struct _virStorageSource {
 #  define DEV_BSIZE 512
 # endif
 
+virStorageSourcePtr virStorageSourceGetBackingStore(const virStorageSource *src,
+                                                    size_t pos);
+
 int virStorageFileProbeFormat(const char *path, uid_t uid, gid_t gid);
 int virStorageFileProbeFormatFromBuf(const char *path,
                                      char *buf,
-- 
1.8.3.1

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