This is a simple helper function, that will return the base image of a given image chain.
Signed-off-by: Jeff Cody <jc...@redhat.com> --- block.c | 16 ++++++++++++++++ block.h | 1 + 2 files changed, 17 insertions(+) diff --git a/block.c b/block.c index 11e275c..5f58600 100644 --- a/block.c +++ b/block.c @@ -3137,6 +3137,22 @@ int bdrv_get_backing_file_depth(BlockDriverState *bs) return 1 + bdrv_get_backing_file_depth(bs->backing_hd); } +BlockDriverState *bdrv_find_base(BlockDriverState *bs) +{ + BlockDriverState *curr_bs = NULL; + + if (!bs) { + return NULL; + } + + curr_bs = bs; + + while (curr_bs->backing_hd) { + curr_bs = curr_bs->backing_hd; + } + return curr_bs; +} + #define NB_SUFFIXES 4 char *get_human_readable_size(char *buf, int buf_size, int64_t size) diff --git a/block.h b/block.h index ee76869..376cc50 100644 --- a/block.h +++ b/block.h @@ -201,6 +201,7 @@ int bdrv_commit_all(void); int bdrv_change_backing_file(BlockDriverState *bs, const char *backing_file, const char *backing_fmt); void bdrv_register(BlockDriver *bdrv); +BlockDriverState *bdrv_find_base(BlockDriverState *bs); int bdrv_delete_intermediate(BlockDriverState *active, BlockDriverState *top, BlockDriverState *base); BlockDriverState *bdrv_find_child(BlockDriverState *active, -- 1.7.11.2