[Qemu-block] [PATCH 14/21] block: add bdrv_can_store_dirty_bitmap

[Vladimir Sementsov-Ogievskiy]

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 <address@hidden>
---
 block.c                   | 22 ++++++++++++++++++++++
 include/block/block.h     |  2 ++
 include/block/block_int.h |  2 ++
 3 files changed, 26 insertions(+)

diff --git a/block.c b/block.c
index 2429384..1570b15 100644
--- a/block.c
+++ b/block.c
@@ -4136,3 +4136,25 @@ void 
bdrv_store_persistent_dirty_bitmaps(BlockDriverState *bs, Error **errp)
 
     drv->bdrv_store_persistent_dirty_bitmaps(bs, errp);
 }
+
+bool bdrv_can_store_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_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_dirty_bitmap(bs, name, granularity, errp);
+}
diff --git a/include/block/block.h b/include/block/block.h
index d23133b..6084fb7 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -526,5 +526,7 @@ void bdrv_del_child(BlockDriverState *parent, BdrvChild 
*child, Error **errp);
 
 void bdrv_load_autoloading_dirty_bitmaps(BlockDriverState *bs, Error **errp);
 void bdrv_store_persistent_dirty_bitmaps(BlockDriverState *bs, Error **errp);
+bool bdrv_can_store_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 1adb699..f263b7e 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -326,6 +326,8 @@ struct BlockDriver {
                                                 Error **errp);
     void (*bdrv_store_persistent_dirty_bitmaps)(BlockDriverState *bs,
                                                 Error **errp);
+    bool (*bdrv_can_store_dirty_bitmap)(BlockDriverState *bs, const char *name,
+                                        uint32_t granularity, Error **errp);
 
     QLIST_ENTRY(BlockDriver) list;
 };
-- 
1.8.3.1