[Qemu-devel] [PATCH v2 04/10] qcow2/bitmap: cache loaded bitmaps

[John Snow <jsnow@redhat.com>]

For bitmaps that we succeeded in loading, we can cache a reference
to that object. This will let us iterate over the more convenient
form of in-memory bitmaps for qemu-img bitmap manipulation tools.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 block/qcow2-bitmap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 5ae9b17928..d94b6bd5cf 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -981,6 +981,7 @@ bool qcow2_load_dirty_bitmaps(BlockDriverState *bs, Error **errp)
             if (bitmap == NULL) {
                 goto fail;
             }
+            bm->dirty_bitmap = bitmap;
 
             if (!(bm->flags & BME_FLAG_AUTO)) {
                 bdrv_disable_dirty_bitmap(bitmap);
@@ -1382,6 +1383,7 @@ void qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs, Error **errp)
             bm->name = g_strdup(name);
             QSIMPLEQ_INSERT_TAIL(bm_list, bm, entry);
         } else {
+            assert(bitmap == bm->dirty_bitmap);
             if (!(bm->flags & BME_FLAG_IN_USE)) {
                 error_setg(errp, "Bitmap '%s' already exists in the image",
                            name);
-- 
2.14.3