[libvirt] [PATCH 4/4] storageVolCreateXMLFrom: Check if backend knows how to createVol
It is highly unlikely that a backend will know how to create a
volume from a different volume (buildVolFrom) and not know how to
create an empty volume (createVol). But:
1) we call the function without any prior check so if that's the
case we would SIGSEGV immediatelly
2) it's better to be safe than sorry.
Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com>
---
src/storage/storage_driver.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/storage/storage_driver.c b/src/storage/storage_driver.c
index e0ded01..81b1584 100644
--- a/src/storage/storage_driver.c
+++ b/src/storage/storage_driver.c
@@ -2037,6 +2037,13 @@ storageVolCreateXMLFrom(virStoragePoolPtr obj,
if (newvol->target.capacity < origvol->target.capacity)
newvol->target.capacity = origvol->target.capacity;
+ if (!backend->createVol) {
+ virReportError(VIR_ERR_NO_SUPPORT,
+ "%s", _("storage pool does not support volume
"
+ "creation"));
+ goto cleanup;
+ }
+
if (!backend->buildVolFrom) {
virReportError(VIR_ERR_NO_SUPPORT,
"%s", _("storage pool does not support"
--
2.4.10