block/dirty-bitmaps: fix merge permissions

In prior commits that made merge transactionable, we removed the
assertion that merge cannot operate on disabled bitmaps. In addition,
we want to make sure that we are prohibiting merges to "locked" bitmaps.

Use the new user_locked function to check.

Reported-by: Eric Blake <eblake@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20181002230218.13949-3-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>

diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 9603cdd29bf3437354d49cd4a7c7cd8ffc504bce..bfccb0ea15e18f8f28ff8af2c68207209292059b 100644 (file)
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -806,9 +806,9 @@ void bdrv_merge_dirty_bitmap(BdrvDirtyBitmap *dest, const BdrvDirtyBitmap *src,
 
     qemu_mutex_lock(dest->mutex);
 
-    if (bdrv_dirty_bitmap_frozen(dest)) {
-        error_setg(errp, "Bitmap '%s' is frozen and cannot be modified",
-                   dest->name);
+    if (bdrv_dirty_bitmap_user_locked(dest)) {
+        error_setg(errp, "Bitmap '%s' is currently in use by another"
+        " operation and cannot be modified", dest->name);
         goto out;
     }