qemu: Extract snapshot related code to a separate file

We've dumped all the snapshot helpers and related code into
qemu_driver.c. It accounted for ~10% of overal size of qemu_driver.c.

Separate the code to qemu_snapshot.c/h.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

po/POTFILES.in

@@ -172,6 +172,7 @@
 @SRCDIR@src/qemu/qemu_qapi.c
 @SRCDIR@src/qemu/qemu_saveimage.c
 @SRCDIR@src/qemu/qemu_slirp.c
+@SRCDIR@src/qemu/qemu_snapshot.c
 @SRCDIR@src/qemu/qemu_tpm.c
 @SRCDIR@src/qemu/qemu_validate.c
 @SRCDIR@src/qemu/qemu_vhost_user.c

src/qemu/meson.build

@@ -31,6 +31,7 @@ qemu_driver_sources = [
   'qemu_qapi.c',
   'qemu_saveimage.c',
   'qemu_security.c',
+  'qemu_snapshot.c',
   'qemu_slirp.c',
   'qemu_tpm.c',
   'qemu_validate.c',

src/qemu/qemu_snapshot.h

@@ -0,0 +1,55 @@
+/*
+ * qemu_snapshot.h: Implementation and handling of snapshots
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "virconftypes.h"
+#include "datatypes.h"
+#include "qemu_conf.h"
+
+virDomainMomentObjPtr
+qemuSnapObjFromName(virDomainObjPtr vm,
+                    const char *name);
+
+virDomainMomentObjPtr
+qemuSnapObjFromSnapshot(virDomainObjPtr vm,
+                        virDomainSnapshotPtr snapshot);
+
+int
+qemuSnapshotFSFreeze(virDomainObjPtr vm,
+                     const char **mountpoints,
+                     unsigned int nmountpoints);
+int
+qemuSnapshotFSThaw(virDomainObjPtr vm,
+                   bool report);
+
+virDomainSnapshotPtr
+qemuSnapshotCreateXML(virDomainPtr domain,
+                      virDomainObjPtr vm,
+                      const char *xmlDesc,
+                      unsigned int flags);
+
+int
+qemuSnapshotRevert(virDomainObjPtr vm,
+                   virDomainSnapshotPtr snapshot,
+                   unsigned int flags);
+
+int
+qemuSnapshotDelete(virDomainObjPtr vm,
+                   virDomainSnapshotPtr snapshot,
+                   unsigned int flags);