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block: create bdrv_get_backing_file_depth()

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Create bdrv_get_backing_file_depth() in order to be able to show
in QMP and HMP how many ancestors backing an image a block device
have.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Benoît Canet 2012-08-02 10:22:47 +02:00 committed by Luiz Capitulino
parent e0d45df7a5
commit f198fd1c9a
2 changed files with 14 additions and 0 deletions
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13
block.c
View File

@ -2754,6 +2754,19 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
return NULL;
}
int bdrv_get_backing_file_depth(BlockDriverState *bs)
{
if (!bs->drv) {
return 0;
}
if (!bs->backing_hd) {
return 0;
}
return 1 + bdrv_get_backing_file_depth(bs->backing_hd);
}
#define NB_SUFFIXES 4
char *get_human_readable_size(char *buf, int buf_size, int64_t size)

1
block.h
View File

@ -174,6 +174,7 @@ int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top,
int nb_sectors, int *pnum);
BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
const char *backing_file);
int bdrv_get_backing_file_depth(BlockDriverState *bs);
int bdrv_truncate(BlockDriverState *bs, int64_t offset);
int64_t bdrv_getlength(BlockDriverState *bs);
int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);