[libvirt] [PATCH v3 08/18] qemu: Explicitly pass backing store to qemuBuildStorageSourceChainAttachPrepareBlockdevTop

[Peter Krempa]

In some cases we'll need to pass in a backing store which is not
recorded as the backing store of @src. Export backingStore as variable
and fix all callers to pass in the backing store. No semantic changes
for now.

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/qemu/qemu_command.c | 12 +++++++++---
 src/qemu/qemu_command.h |  1 +
 src/qemu/qemu_driver.c  |  1 +
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index fa8bf39359..9cd46e8ea7 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -10723,11 +10723,12 @@ qemuBuildStorageSourceChainAttachPrepareDrive(virDomainDiskDefPtr disk,
 static int
 qemuBuildStorageSourceChainAttachPrepareBlockdevOne(qemuBlockStorageSourceChainData *data,
                                                     virStorageSourcePtr src,
+                                                    virStorageSourcePtr backingStore,
                                                     virQEMUCapsPtr qemuCaps)
 {
     VIR_AUTOPTR(qemuBlockStorageSourceAttachData) elem = NULL;

-    if (!(elem = qemuBlockStorageSourceAttachPrepareBlockdev(src, src->backingStore, true)))
+    if (!(elem = qemuBlockStorageSourceAttachPrepareBlockdev(src, backingStore, true)))
         return -1;

     if (qemuBuildStorageSourceAttachPrepareCommon(src, elem, qemuCaps) < 0)
@@ -10759,7 +10760,9 @@ qemuBuildStorageSourceChainAttachPrepareBlockdev(virStorageSourcePtr top,
         return NULL;

     for (n = top; virStorageSourceIsBacking(n); n = n->backingStore) {
-        if (qemuBuildStorageSourceChainAttachPrepareBlockdevOne(data, n, qemuCaps) < 0)
+        if (qemuBuildStorageSourceChainAttachPrepareBlockdevOne(data, n,
+                                                                n->backingStore,
+                                                                qemuCaps) < 0)
             return NULL;
     }

@@ -10770,6 +10773,7 @@ qemuBuildStorageSourceChainAttachPrepareBlockdev(virStorageSourcePtr top,
 /**
  * qemuBuildStorageSourceChainAttachPrepareBlockdevTop:
  * @top: storage source chain
+ * @backingStore: a storage source to use as backing of @top
  * @qemuCaps: qemu capabilities object
  *
  * Prepares qemuBlockStorageSourceChainDataPtr for attaching of @top image only
@@ -10777,6 +10781,7 @@ qemuBuildStorageSourceChainAttachPrepareBlockdev(virStorageSourcePtr top,
  */
 qemuBlockStorageSourceChainDataPtr
 qemuBuildStorageSourceChainAttachPrepareBlockdevTop(virStorageSourcePtr top,
+                                                    virStorageSourcePtr backingStore,
                                                     virQEMUCapsPtr qemuCaps)
 {
     VIR_AUTOPTR(qemuBlockStorageSourceChainData) data = NULL;
@@ -10784,7 +10789,8 @@ qemuBuildStorageSourceChainAttachPrepareBlockdevTop(virStorageSourcePtr top,
     if (VIR_ALLOC(data) < 0)
         return NULL;

-    if (qemuBuildStorageSourceChainAttachPrepareBlockdevOne(data, top, qemuCaps) < 0)
+    if (qemuBuildStorageSourceChainAttachPrepareBlockdevOne(data, top, backingStore,
+                                                            qemuCaps) < 0)
         return NULL;

     VIR_RETURN_PTR(data);
diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h
index 6f97e7bc0c..60f9843b03 100644
--- a/src/qemu/qemu_command.h
+++ b/src/qemu/qemu_command.h
@@ -119,6 +119,7 @@ qemuBuildStorageSourceChainAttachPrepareBlockdev(virStorageSourcePtr top,

 qemuBlockStorageSourceChainDataPtr
 qemuBuildStorageSourceChainAttachPrepareBlockdevTop(virStorageSourcePtr top,
+                                                    virStorageSourcePtr backingStore,
                                                     virQEMUCapsPtr qemuCaps);

 char
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 78f5471b79..df677d8f4c 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -18547,6 +18547,7 @@ qemuDomainBlockCopyCommon(virDomainObjPtr vm,
             }

             if (!(crdata = qemuBuildStorageSourceChainAttachPrepareBlockdevTop(mirror,
+                                                                               mirror->backingStore,
                                                                                priv->qemuCaps)))
                 goto endjob;
         }
-- 
2.21.0