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block: helper function, to find the base image of a chain

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This is a simple helper function, that will return the base image
of a given image chain.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Jeff Cody 2012-09-27 13:29:15 -04:00 committed by Kevin Wolf
parent 9abf2dbaf6
commit 79fac5680d
2 changed files with 17 additions and 0 deletions
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16
block.c
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@ -3117,6 +3117,22 @@ int bdrv_get_backing_file_depth(BlockDriverState *bs)
return 1 + bdrv_get_backing_file_depth(bs->backing_hd); 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 #define NB_SUFFIXES 4
char *get_human_readable_size(char *buf, int buf_size, int64_t size) char *get_human_readable_size(char *buf, int buf_size, int64_t size)

1
block.h
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@ -207,6 +207,7 @@ int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
BlockDriverState *base); BlockDriverState *base);
BlockDriverState *bdrv_find_overlay(BlockDriverState *active, BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
BlockDriverState *bs); BlockDriverState *bs);
BlockDriverState *bdrv_find_base(BlockDriverState *bs);
typedef struct BdrvCheckResult { typedef struct BdrvCheckResult {