qcow2: add .bdrv_can_store_new_dirty_bitmap
Realize .bdrv_can_store_new_dirty_bitmap interface.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20170628120530.31251-23-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index f82478c..a8c7e1d 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -1388,3 +1388,54 @@
return 0;
}
+
+bool qcow2_can_store_new_dirty_bitmap(BlockDriverState *bs,
+ const char *name,
+ uint32_t granularity,
+ Error **errp)
+{
+ BDRVQcow2State *s = bs->opaque;
+ bool found;
+ Qcow2BitmapList *bm_list;
+
+ if (check_constraints_on_bitmap(bs, name, granularity, errp) != 0) {
+ goto fail;
+ }
+
+ if (s->nb_bitmaps == 0) {
+ return true;
+ }
+
+ if (s->nb_bitmaps >= QCOW2_MAX_BITMAPS) {
+ error_setg(errp,
+ "Maximum number of persistent bitmaps is already reached");
+ goto fail;
+ }
+
+ if (s->bitmap_directory_size + calc_dir_entry_size(strlen(name), 0) >
+ QCOW2_MAX_BITMAP_DIRECTORY_SIZE)
+ {
+ error_setg(errp, "Not enough space in the bitmap directory");
+ goto fail;
+ }
+
+ bm_list = bitmap_list_load(bs, s->bitmap_directory_offset,
+ s->bitmap_directory_size, errp);
+ if (bm_list == NULL) {
+ goto fail;
+ }
+
+ found = find_bitmap_by_name(bm_list, name);
+ bitmap_list_free(bm_list);
+ if (found) {
+ error_setg(errp, "Bitmap with the same name is already stored");
+ goto fail;
+ }
+
+ return true;
+
+fail:
+ error_prepend(errp, "Can't make bitmap '%s' persistent in '%s': ",
+ name, bdrv_get_device_or_node_name(bs));
+ return false;
+}
