[Qemu-devel] [PATCH 16/25] block: add bdrv_can_store_new_dirty_bitmap

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

This will be needed to check some restrictions before making bitmap
persistent in qmp-block-dirty-bitmap-add (this functionality will be
added by future patch)

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
---
 block.c                   | 22 ++++++++++++++++++++++
 include/block/block.h     |  3 +++
 include/block/block_int.h |  5 +++++
 3 files changed, 30 insertions(+)

diff --git a/block.c b/block.c
index 96816658bd..f7712c4136 100644
--- a/block.c
+++ b/block.c
@@ -4889,3 +4889,25 @@ void bdrv_del_child(BlockDriverState *parent_bs, BdrvChild *child, Error **errp)
 
     parent_bs->drv->bdrv_del_child(parent_bs, child, errp);
 }
+
+bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name,
+                                     uint32_t granularity, Error **errp)
+{
+    BlockDriver *drv = bs->drv;
+
+    if (!drv) {
+        error_setg_errno(errp, ENOMEDIUM,
+                         "Can't store persistent bitmaps to %s",
+                         bdrv_get_device_or_node_name(bs));
+        return false;
+    }
+
+    if (!drv->bdrv_can_store_new_dirty_bitmap) {
+        error_setg_errno(errp, ENOTSUP,
+                         "Can't store persistent bitmaps to %s",
+                         bdrv_get_device_or_node_name(bs));
+        return false;
+    }
+
+    return drv->bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp);
+}
diff --git a/include/block/block.h b/include/block/block.h
index 9b355e92d8..ee320db909 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -629,4 +629,7 @@ void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child,
                     Error **errp);
 void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp);
 
+bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name,
+                                     uint32_t granularity, Error **errp);
+
 #endif
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 8d3724cce6..70b73a98a8 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -380,6 +380,11 @@ struct BlockDriver {
                              uint64_t parent_perm, uint64_t parent_shared,
                              uint64_t *nperm, uint64_t *nshared);
 
+    bool (*bdrv_can_store_new_dirty_bitmap)(BlockDriverState *bs,
+                                            const char *name,
+                                            uint32_t granularity,
+                                            Error **errp);
+
     QLIST_ENTRY(BlockDriver) list;
 };
 
-- 
2.11.1