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qemu: snapshot: Mark file becoming backingStore as read-only

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For any backing file we set 'read-only' to true, but didn't do this when
modifying the recorded backing store when creating external snapshots.

This meant that qemu would attempt to open the backing-file read-write.
This would fail for example when selinux is used as qemu doesn't have
write permission for the backing file.

https://bugzilla.redhat.com/show_bug.cgi?id=1781079

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2019-12-09 12:44:41 +01:00
parent 35614b6022
commit 6f6a1763a1
1 changed files with 2 additions and 0 deletions
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2
src/qemu/qemu_driver.c
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@ -14606,6 +14606,7 @@ qemuDomainSnapshotCreateInactiveExternal(virQEMUDriverPtr driver,
goto cleanup;
if (virStorageSourceHasBacking(defdisk->src)) {
defdisk->src->readonly = true;
newsrc->backingStore = g_steal_pointer(&defdisk->src);
} else {
virObjectUnref(defdisk->src);
@ -15457,6 +15458,7 @@ qemuDomainSnapshotDiskUpdateSource(virQEMUDriverPtr driver,
qemuDomainSnapshotDiskUpdateSourceRenumber(dd->disk->src);
if (dd->persistdisk) {
dd->persistdisk->src->readonly = true;
dd->persistsrc->backingStore = g_steal_pointer(&dd->persistdisk->src);
dd->persistdisk->src = g_steal_pointer(&dd->persistsrc);
}