[PATCH 4/5] qemu: capabilities: Introduce QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY

[Peter Krempa]

The capability is based on qemu's support of using blockdev-snapshot to
install backing chain also for images which are in use by a block-copy
job.

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/qemu/qemu_capabilities.c                     | 2 ++
 src/qemu/qemu_capabilities.h                     | 1 +
 tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml | 1 +
 3 files changed, 4 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index a75ca0574d..25a77c24af 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -565,6 +565,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
               /* 355 */
               "vhost-user-fs",
               "query-named-block-nodes.flat",
+              "blockdev-snapshot.allow-write-only-overlay",
     );


@@ -1442,6 +1443,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsQMPSchemaQueries[] = {
     { "human-monitor-command/$savevm-monitor-nodes", QEMU_CAPS_SAVEVM_MONITOR_NODES },
     { "blockdev-add/arg-type/+nvme", QEMU_CAPS_DRIVE_NVME },
     { "query-named-block-nodes/arg-type/flat", QEMU_CAPS_QMP_QUERY_NAMED_BLOCK_NODES_FLAT },
+    { "blockdev-snapshot/$allow-write-only-overlay", QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY },
 };

 typedef struct _virQEMUCapsObjectTypeProps virQEMUCapsObjectTypeProps;
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 8b6145c327..e952fcb6b8 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -546,6 +546,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     /* 355 */
     QEMU_CAPS_DEVICE_VHOST_USER_FS, /* -device vhost-user-fs */
     QEMU_CAPS_QMP_QUERY_NAMED_BLOCK_NODES_FLAT, /* query-named-block-nodes supports the 'flat' option */
+    QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY, /* blockdev-snapshot has the 'allow-write-only-overlay' feature */

     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
index 5b8005dd16..3a3c9b1363 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
@@ -225,6 +225,7 @@
   <flag name='virtio-net.failover'/>
   <flag name='vhost-user-fs'/>
   <flag name='query-named-block-nodes.flat'/>
+  <flag name='blockdev-snapshot.allow-write-only-overlay'/>
   <version>4002050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100241</microcodeVersion>
-- 
2.24.1