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storageVolCreateXMLFrom: Check if backend knows how to createVol

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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@redhat.com>
This commit is contained in:
Michal Privoznik 2016-02-10 17:17:00 +01:00
parent 78490acc39
commit 611a278fa4
1 changed files with 7 additions and 0 deletions
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7
src/storage/storage_driver.c
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@ -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"