[Qemu-block] [PATCH 3/9] block: Add blk_commit_all() and blk_invalidate_cache_all()

[Max Reitz]

These functions will be changed to iterate through the BDS trees as
defined by the BlockBackends instead of the list of root BDS, therefore
prepare moving their code to the BlockBackend level.

Signed-off-by: Max Reitz <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
---
 block/block-backend.c          | 10 ++++++++++
 include/sysemu/block-backend.h |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/block/block-backend.c b/block/block-backend.c
index ab3affa..2550ee0 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1251,3 +1251,13 @@ BlockBackendRootState *blk_get_root_state(BlockBackend 
*blk)
 {
     return &blk->root_state;
 }
+
+int blk_commit_all(void)
+{
+    return bdrv_commit_all();
+}
+
+void blk_invalidate_cache_all(Error **errp)
+{
+    bdrv_invalidate_cache_all(errp);
+}
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 8b4a9ec..2400a7e 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -126,7 +126,9 @@ int blk_co_discard(BlockBackend *blk, int64_t sector_num, 
int nb_sectors);
 int blk_co_flush(BlockBackend *blk);
 int blk_flush(BlockBackend *blk);
 int blk_flush_all(void);
+int blk_commit_all(void);
 void blk_drain_all(void);
+void blk_invalidate_cache_all(Error **errp);
 void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error,
                       BlockdevOnError on_write_error);
 BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read);
-- 
2.1.0