In some cases, we want to take a quorum child offline, and take
another child online.
Signed-off-by: Wen Congyang <we...@cn.fujitsu.com>
Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com>
Signed-off-by: Gonglei <arei.gong...@huawei.com>
Reviewed-by: Eric Blake <ebl...@redhat.com>
---
block.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++
include/block/block.h | 5 +++++
include/block/block_int.h | 5 +++++
3 files changed, 60 insertions(+)
diff --git a/block.c b/block.c
index e815d73..1b25e43 100644
--- a/block.c
+++ b/block.c
@@ -4265,3 +4265,53 @@ BlockAcctStats *bdrv_get_stats(BlockDriverState *bs)
{
return &bs->stats;
}
+
+/*
+ * Hot add/remove a BDS's child. So the user can take a child offline when
+ * it is broken and take a new child online
+ */
+void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs,
+ Error **errp)
+{
+
+ if (!parent_bs->drv || !parent_bs->drv->bdrv_add_child) {
+ error_setg(errp, "The BDS %s doesn't support adding a child",
+ bdrv_get_device_or_node_name(parent_bs));
+ return;
+ }
+
+ if (!QLIST_EMPTY(&child_bs->parents)) {
+ error_setg(errp, "The BDS %s already has parent",
+ child_bs->node_name);
+ return;
+ }
+
+ parent_bs->drv->bdrv_add_child(parent_bs, child_bs, errp);
+}
+
+void bdrv_del_child(BlockDriverState *parent_bs, BlockDriverState *child_bs,
+ Error **errp)
+{
+ BdrvChild *child;
+
+ if (!parent_bs->drv || !parent_bs->drv->bdrv_del_child) {
+ error_setg(errp, "The BDS %s doesn't support removing a child",
+ bdrv_get_device_or_node_name(parent_bs));
+ return;
+ }
+
+ QLIST_FOREACH(child, &parent_bs->children, next) {
+ if (child->bs == child_bs) {
+ break;
+ }
+ }
+
+ if (!child) {
+ error_setg(errp, "BDS %s is not a child of %s",
+ bdrv_get_device_or_node_name(child_bs),
+ bdrv_get_device_or_node_name(parent_bs));
+ return;
+ }
+
+ parent_bs->drv->bdrv_del_child(parent_bs, child_bs, errp);
+}
diff --git a/include/block/block.h b/include/block/block.h
index ef67353..665c56f 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -616,4 +616,9 @@ void bdrv_flush_io_queue(BlockDriverState *bs);
BlockAcctStats *bdrv_get_stats(BlockDriverState *bs);
+void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child,
+ Error **errp);
+void bdrv_del_child(BlockDriverState *parent, BlockDriverState *child,
+ Error **errp);
+
#endif
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 2f2c47b..64cbc55 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -288,6 +288,11 @@ struct BlockDriver {
*/
int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo);
+ void (*bdrv_add_child)(BlockDriverState *parent, BlockDriverState *child,
+ Error **errp);
+ void (*bdrv_del_child)(BlockDriverState *parent, BlockDriverState *child,
+ Error **errp);
+
QLIST_ENTRY(BlockDriver) list;
};
--
2.4.3
