===================================================================
@@ -2580,6 +2580,24 @@ int bdrv_snapshot_load_tmp(BlockDriverSt
return -ENOTSUP;
}
+BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, const char *id)
+{
+ if (!bs->drv) {
+ return NULL;
+ }
+
+ if (bs->backing_hd) {
+ if (strncmp(bs->backing_file, id, sizeof(bs->backing_file)) == 0) {
+ return bs->backing_hd;
+ } else {
+ return bdrv_find_backing_image(bs->backing_hd, id);
+ }
+ }
+
+ return NULL;
+}
+
+
#define NB_SUFFIXES 4
char *get_human_readable_size(char *buf, int buf_size, int64_t size)
===================================================================
@@ -146,6 +146,7 @@ int coroutine_fn bdrv_co_writev(BlockDri
int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum);
+BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, const char *id);
int bdrv_truncate(BlockDriverState *bs, int64_t offset);
int64_t bdrv_getlength(BlockDriverState *bs);
int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
Add bdrv_find_backing_image: given a BlockDriverState pointer, and an id, traverse the backing image chain to locate the id. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>