This enum will supplement BdrvChildClass when it comes to what role (or
combination of roles) a child takes for its parent.
Because empty enums are not allowed, let us just start with it filled.
Signed-off-by: Max Reitz <mre...@redhat.com>
---
include/block/block.h | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/include/block/block.h b/include/block/block.h
index 38963ef203..36817d5689 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -279,6 +279,44 @@ enum {
DEFAULT_PERM_UNCHANGED = BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH,
};
+typedef enum BdrvChildRole {
+ /*
+ * If present, bdrv_replace_node() will not change the node this
+ * BdrvChild points to.
+ */
+ BDRV_CHILD_STAY_AT_NODE = (1 << 0),
+
+ /* Child stores data */
+ BDRV_CHILD_DATA = (1 << 1),
+
+ /* Child stores metadata */
+ BDRV_CHILD_METADATA = (1 << 2),
+
+ /* Filtered child */
+ BDRV_CHILD_FILTERED = (1 << 3),
+
+ /* Child to COW from (backing child) */
+ BDRV_CHILD_COW = (1 << 4),
+
+ /* Child is expected to be a protocol node */
+ BDRV_CHILD_PROTOCOL = (1 << 5),
+
+ /* Child is expected to be a format node */
+ BDRV_CHILD_FORMAT = (1 << 6),
+
+ /*
+ * The primary child. For most drivers, this is the child whose
+ * filename applies best to the parent node.
+ */
+ BDRV_CHILD_PRIMARY = (1 << 7),
+
+ /* Useful combination of flags */
+ BDRV_CHILD_IMAGE = BDRV_CHILD_DATA
+ | BDRV_CHILD_METADATA
+ | BDRV_CHILD_PROTOCOL
+ | BDRV_CHILD_PRIMARY,
+} BdrvChildRole;
+
char *bdrv_perm_names(uint64_t perm);
uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm);
--
2.23.0
