block/dirty-bitmap: add _locked version of bdrv_reclaim_dirty_bitmap
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20180207155837.92351-4-vsementsov@virtuozzo.com
Signed-off-by: John Snow <jsnow@redhat.com>
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 75435f6..ce00ff3 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -320,17 +320,13 @@
* In cases of failure where we can no longer safely delete the parent,
* we may wish to re-join the parent and child/successor.
* The merged parent will be un-frozen, but not explicitly re-enabled.
- * Called with BQL taken.
+ * Called within bdrv_dirty_bitmap_lock..unlock and with BQL taken.
*/
-BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,
- BdrvDirtyBitmap *parent,
- Error **errp)
+BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap_locked(BlockDriverState *bs,
+ BdrvDirtyBitmap *parent,
+ Error **errp)
{
- BdrvDirtyBitmap *successor;
-
- qemu_mutex_lock(parent->mutex);
-
- successor = parent->successor;
+ BdrvDirtyBitmap *successor = parent->successor;
if (!successor) {
error_setg(errp, "Cannot reclaim a successor when none is present");
@@ -344,9 +340,21 @@
bdrv_release_dirty_bitmap_locked(bs, successor);
parent->successor = NULL;
+ return parent;
+}
+
+/* Called with BQL taken. */
+BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,
+ BdrvDirtyBitmap *parent,
+ Error **errp)
+{
+ BdrvDirtyBitmap *ret;
+
+ qemu_mutex_lock(parent->mutex);
+ ret = bdrv_reclaim_dirty_bitmap_locked(bs, parent, errp);
qemu_mutex_unlock(parent->mutex);
- return parent;
+ return ret;
}
/**
