block: Add bdrv_next_monitor_owned()

Add a function for iterating over all monitor-owned BlockDriverStates so
the generic block layer can do so.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

4 files changed, 17 insertions, 0 deletions

diff --git a/blockdev.c b/blockdev.c
index b6d2444..a5df7e7 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -723,6 +723,13 @@ void blockdev_close_all_bdrv_states(void)
     }
 }
 
+/* Iterates over the list of monitor-owned BlockDriverStates */
+BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
+{
+    return bs ? QTAILQ_NEXT(bs, monitor_list)
+              : QTAILQ_FIRST(&monitor_bdrv_states);
+}
+
 static void qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
                             Error **errp)
 {
diff --git a/include/block/block.h b/include/block/block.h
index ea5be0f..09272c3 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -412,6 +412,7 @@ BlockDriverState *bdrv_lookup_bs(const char *device,
 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base);
 BlockDriverState *bdrv_next_node(BlockDriverState *bs);
 BlockDriverState *bdrv_next(BlockDriverState *bs);
+BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs);
 int bdrv_is_encrypted(BlockDriverState *bs);
 int bdrv_key_required(BlockDriverState *bs);
 int bdrv_set_key(BlockDriverState *bs, const char *key);
diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
index 9d9f1d0..b6d1e65 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -1,4 +1,5 @@
 stub-obj-y += arch-query-cpu-def.o
+stub-obj-y += bdrv-next-monitor-owned.o
 stub-obj-y += blk-commit-all.o
 stub-obj-y += blockdev-close-all-bdrv-states.o
 stub-obj-y += clock-warp.o
diff --git a/stubs/bdrv-next-monitor-owned.c b/stubs/bdrv-next-monitor-owned.c
new file mode 100644
index 0000000..2acf6c3
--- /dev/null
+++ b/stubs/bdrv-next-monitor-owned.c
@@ -0,0 +1,8 @@
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "block/block.h"
+
+BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
+{
+    return NULL;
+}