qmp: Add dirty bitmap status field in query-block

Add the "frozen" status booleans, to inform clients
when a bitmap is occupied doing a task.
Signed-off-by: NFam Zheng <famz@redhat.com>
Signed-off-by: NJohn Snow <jsnow@redhat.com>
Reviewed-by: NMax Reitz <mreitz@redhat.com>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Message-id: 1429314609-29776-13-git-send-email-jsnow@redhat.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

block.c

@@ -5699,6 +5699,7 @@ BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
         info->granularity = bdrv_dirty_bitmap_granularity(bm);
         info->has_name = !!bm->name;
         info->name = g_strdup(bm->name);
+        info->frozen = bdrv_dirty_bitmap_frozen(bm);
         entry->value = info;
         *plist = entry;
         plist = &entry->next;

qapi/block-core.json

@@ -336,10 +336,13 @@
 #
 # @granularity: granularity of the dirty bitmap in bytes (since 1.4)
 #
+# @frozen: whether the dirty bitmap is frozen (Since 2.4)
+#
 # Since: 1.3
 ##
 { 'type': 'BlockDirtyInfo',
-  'data': {'*name': 'str', 'count': 'int', 'granularity': 'uint32'} }
+  'data': {'*name': 'str', 'count': 'int', 'granularity': 'uint32',
+           'frozen': 'bool'} }
 
 ##
 # @BlockInfo: