Introduce bdrv_get_full_backing_filename_from_filename(), a function
which takes the name of the backed file and a potentially relative
backing filename to produce the full (absolute) backing filename.
Use this function from bdrv_get_full_backing_filename().
Signed-off-by: Max Reitz <mre...@redhat.com>
Reviewed-by: Kevin Wolf <kw...@redhat.com>
---
block.c | 16 ++++++++++++----
include/block/block.h | 3 +++
2 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/block.c b/block.c
index 866c8b4..0c1be37 100644
--- a/block.c
+++ b/block.c
@@ -303,15 +303,23 @@ void path_combine(char *dest, int dest_size,
}
}
-void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t
sz)
+void bdrv_get_full_backing_filename_from_filename(const char *backed,
+ const char *backing,
+ char *dest, size_t sz)
{
- if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) {
- pstrcpy(dest, sz, bs->backing_file);
+ if (backing[0] == '\0' || path_has_protocol(backing)) {
+ pstrcpy(dest, sz, backing);
} else {
- path_combine(dest, sz, bs->filename, bs->backing_file);
+ path_combine(dest, sz, backed, backing);
}
}
+void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t
sz)
+{
+ bdrv_get_full_backing_filename_from_filename(bs->filename,
bs->backing_file,
+ dest, sz);
+}
+
void bdrv_register(BlockDriver *bdrv)
{
/* Block drivers without coroutine functions need emulation */
diff --git a/include/block/block.h b/include/block/block.h
index 610be9f..1c7ecaa 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -399,6 +399,9 @@ void bdrv_get_backing_filename(BlockDriverState *bs,
char *filename, int filename_size);
void bdrv_get_full_backing_filename(BlockDriverState *bs,
char *dest, size_t sz);
+void bdrv_get_full_backing_filename_from_filename(const char *backed,
+ const char *backing,
+ char *dest, size_t sz);
int bdrv_is_snapshot(BlockDriverState *bs);
int path_is_absolute(const char *path);
--
1.9.3
