[PATCH 3/8] block: realize BlockParentClass for BlockDriverState
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov(a)virtuozzo.com>
---
block.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/block.c b/block.c
index e97ce0b1c8..449f933661 100644
--- a/block.c
+++ b/block.c
@@ -26,6 +26,7 @@
#include "qemu/osdep.h"
#include "block/trace.h"
#include "block/block_int.h"
+#include "block/block-parent.h"
#include "block/blockjob.h"
#include "block/fuse.h"
#include "block/nbd.h"
@@ -7501,6 +7502,47 @@ int bdrv_make_empty(BdrvChild *c, Error **errp)
return 0;
}
+static int bdrv_find_child(const char *parent_id, const char *child_name,
+ BlockDriverState *child_bs, BdrvChild **child,
+ Error **errp)
+{
+ BdrvChild *c, *found = NULL;
+ BlockDriverState *bs;
+
+ bs = bdrv_find_node(parent_id);
+ if (!bs) {
+ return 0;
+ }
+
+ QLIST_FOREACH(c, &bs->children, next) {
+ if ((!child_name || strcmp(c->name, child_name) == 0) &&
+ (!child_bs || child_bs == c->bs))
+ {
+ if (found) {
+ error_setg(errp, "node '%s' has more than one matching
child",
+ parent_id);
+ return -EINVAL;
+ } else {
+ found = c;
+ }
+ }
+ }
+
+ if (!found) {
+ error_setg(errp, "node '%s' exists but it doesn't have matching
child",
+ parent_id);
+ return -EINVAL;
+ }
+
+ *child = found;
+ return 1;
+}
+
+BlockParentClass block_parent_bdrv = {
+ .name = "block driver",
+ .find_child = bdrv_find_child,
+};
+
/*
* Return the child that @bs acts as an overlay for, and from which data may be
* copied in COW or COR operations. Usually this is the backing file.
@@ -7653,3 +7695,10 @@ BlockDriverState *bdrv_backing_chain_next(BlockDriverState *bs)
{
return bdrv_skip_filters(bdrv_cow_bs(bdrv_skip_filters(bs)));
}
+
+static void block_c_init(void)
+{
+ block_parent_class_register(&block_parent_bdrv);
+}
+
+block_init(block_c_init);
--
2.29.2