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 <address@hidden>
---
include/block/block.h | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/include/block/block.h b/include/block/block.h
index 38963ef203..0f7e8caa5b 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -279,6 +279,33 @@ enum {
DEFAULT_PERM_UNCHANGED = BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH,
};
+typedef enum BdrvChildRole {
+ /* Child stores data */
+ BDRV_CHILD_DATA = (1 << 0),
+
+ /* Child stores metadata */
+ BDRV_CHILD_METADATA = (1 << 1),
+
+ /* Filtered child */
+ BDRV_CHILD_FILTERED = (1 << 2),
+
+ /* Child to COW from (backing child) */
+ BDRV_CHILD_COW = (1 << 3),
+
+ /*
+ * The primary child. For most drivers, this is the child whose
+ * filename applies best to the parent node.
+ * Each parent must give this flag to no more than one child at a
+ * time.
+ */
+ BDRV_CHILD_PRIMARY = (1 << 4),
+
+ /* Useful combination of flags */
+ BDRV_CHILD_IMAGE = BDRV_CHILD_DATA
+ | BDRV_CHILD_METADATA
+ | BDRV_CHILD_PRIMARY,
+} BdrvChildRole;
+
char *bdrv_perm_names(uint64_t perm);
uint64_t bdrv_qapi_perm_to_blk_perm(BlockPermission qapi_perm);