Make bdrv_get_full_backing_filename() return an allocated string instead
of placing the result in a caller-provided buffer.
Signed-off-by: Max Reitz <mre...@redhat.com>
---
block.c | 26 +++++++++-----------------
block/qapi.c | 12 ++----------
include/block/block.h | 3 +--
3 files changed, 12 insertions(+), 29 deletions(-)
diff --git a/block.c b/block.c
index b02e492..58c7094 100644
--- a/block.c
+++ b/block.c
@@ -220,19 +220,13 @@ char *bdrv_get_full_backing_filename_from_filename(const
char *backed,
}
}
-void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t
sz,
- Error **errp)
+char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp)
{
char *backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename;
- char *full_name;
- full_name = bdrv_get_full_backing_filename_from_filename(backed,
- bs->backing_file,
- errp);
- if (full_name) {
- pstrcpy(dest, sz, full_name);
- g_free(full_name);
- }
+ return bdrv_get_full_backing_filename_from_filename(backed,
+ bs->backing_file,
+ errp);
}
void bdrv_register(BlockDriver *bdrv)
@@ -1484,7 +1478,7 @@ out:
int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
const char *bdref_key, Error **errp)
{
- char *backing_filename = g_malloc0(PATH_MAX);
+ char *backing_filename = NULL;
char *bdref_key_dot;
const char *reference = NULL;
int ret = 0;
@@ -1511,7 +1505,7 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict
*parent_options,
reference = qdict_get_try_str(parent_options, bdref_key);
if (reference || qdict_haskey(options, "file.filename")) {
- backing_filename[0] = '\0';
+ backing_filename = NULL;
/* FIXME: Should also be set to true if @options contains other runtime
* options which control the data that is read from the backing
@@ -1521,8 +1515,7 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict
*parent_options,
QDECREF(options);
goto free_exit;
} else {
- bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX,
- &local_err);
+ backing_filename = bdrv_get_full_backing_filename(bs, &local_err);
if (local_err) {
ret = -EINVAL;
error_propagate(errp, local_err);
@@ -1542,9 +1535,8 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict
*parent_options,
qdict_put(options, "driver", qstring_from_str(bs->backing_format));
}
- backing_hd = bdrv_open_inherit(*backing_filename ? backing_filename : NULL,
- reference, options, 0, bs, &child_backing,
- errp);
+ backing_hd = bdrv_open_inherit(backing_filename, reference, options, 0, bs,
+ &child_backing, errp);
if (!backing_hd) {
bs->open_flags |= BDRV_O_NO_BACKING;
error_prepend(errp, "Could not open backing file: ");
diff --git a/block/qapi.c b/block/qapi.c
index a62e862..1543dd6 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -265,18 +265,10 @@ void bdrv_query_image_info(BlockDriverState *bs,
backing_filename = bs->backing_file;
if (backing_filename[0] != '\0') {
- char *backing_filename2 = g_malloc0(PATH_MAX);
+ char *backing_filename2;
info->backing_filename = g_strdup(backing_filename);
info->has_backing_filename = true;
- bdrv_get_full_backing_filename(bs, backing_filename2, PATH_MAX, &err);
- if (err) {
- /* Can't reconstruct the full backing filename, so we must omit
- * this field and apply a Best Effort to this query. */
- g_free(backing_filename2);
- backing_filename2 = NULL;
- error_free(err);
- err = NULL;
- }
+ backing_filename2 = bdrv_get_full_backing_filename(bs, NULL);
/* Always report the full_backing_filename if present, even if it's the
* same as backing_filename. That they are same is useful info. */
diff --git a/include/block/block.h b/include/block/block.h
index fe16e45..eb41956 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -435,8 +435,7 @@ void bdrv_round_to_clusters(BlockDriverState *bs,
const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
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, Error **errp);
+char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp);
char *bdrv_get_full_backing_filename_from_filename(const char *backed,
const char *backing,
Error **errp);
--
2.10.2
