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block: add bdrv_find_backing_image

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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>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Marcelo Tosatti 2012-01-18 14:40:51 +00:00 committed by Kevin Wolf
parent aa398a5c3a
commit e8a6bb9caa
2 changed files with 20 additions and 0 deletions
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18
block.c
View File

@ -2595,6 +2595,24 @@ int bdrv_snapshot_load_tmp(BlockDriverState *bs,
return -ENOTSUP;
}
BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
const char *backing_file)
{
if (!bs->drv) {
return NULL;
}
if (bs->backing_hd) {
if (strcmp(bs->backing_file, backing_file) == 0) {
return bs->backing_hd;
} else {
return bdrv_find_backing_image(bs->backing_hd, backing_file);
}
}
return NULL;
}
#define NB_SUFFIXES 4
char *get_human_readable_size(char *buf, int buf_size, int64_t size)

2
block.h
View File

@ -148,6 +148,8 @@ int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
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 *backing_file);
int bdrv_truncate(BlockDriverState *bs, int64_t offset);
int64_t bdrv_getlength(BlockDriverState *bs);
int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);