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block: bdrv_get_full_backing_filename_from_...'s ret. val.

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Make bdrv_get_full_backing_filename_from_filename() return an allocated
string instead of placing the result in a caller-provided buffer.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190201192935.18394-11-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2019-02-01 20:29:14 +01:00
parent 009b03aaa2
commit 645ae7d88e
4 changed files with 49 additions and 33 deletions
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53
block.c
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@ -312,20 +312,29 @@ fail:
return -EACCES;
}
void bdrv_get_full_backing_filename_from_filename(const char *backed,
const char *backing,
char *dest, size_t sz,
Error **errp)
/*
* If @backing is empty, this function returns NULL without setting
* @errp. In all other cases, NULL will only be returned with @errp
* set.
*
* Therefore, a return value of NULL without @errp set means that
* there is no backing file; if @errp is set, there is one but its
* absolute filename cannot be generated.
*/
char *bdrv_get_full_backing_filename_from_filename(const char *backed,
const char *backing,
Error **errp)
{
if (backing[0] == '\0' || path_has_protocol(backing) ||
path_is_absolute(backing))
{
pstrcpy(dest, sz, backing);
if (backing[0] == '\0') {
return NULL;
} else if (path_has_protocol(backing) || path_is_absolute(backing)) {
return g_strdup(backing);
} else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) {
error_setg(errp, "Cannot use relative backing file names for '%s'",
backed);
return NULL;
} else {
path_combine_deprecated(dest, sz, backed, backing);
return path_combine(backed, backing);
}
}
@ -333,12 +342,24 @@ void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz,
Error **errp)
{
char *backed;
char *full_name;
Error *local_error = NULL;
bdrv_refresh_filename(bs);
backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename;
bdrv_get_full_backing_filename_from_filename(backed, bs->backing_file,
dest, sz, errp);
full_name = bdrv_get_full_backing_filename_from_filename(backed,
bs->backing_file,
&local_error);
if (full_name) {
pstrcpy(dest, sz, full_name);
g_free(full_name);
} else if (local_error) {
error_propagate(errp, local_error);
} else if (sz > 0) {
*dest = '\0';
}
}
void bdrv_register(BlockDriver *bdrv)
@ -5179,17 +5200,17 @@ void bdrv_img_create(const char *filename, const char *fmt,
size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, img_size);
if (backing_file && !(flags & BDRV_O_NO_BACKING)) {
BlockDriverState *bs;
char *full_backing = g_new0(char, PATH_MAX);
char *full_backing;
int back_flags;
QDict *backing_options = NULL;
bdrv_get_full_backing_filename_from_filename(filename, backing_file,
full_backing, PATH_MAX,
&local_err);
full_backing =
bdrv_get_full_backing_filename_from_filename(filename, backing_file,
&local_err);
if (local_err) {
g_free(full_backing);
goto out;
}
assert(full_backing);
/* backing files always opened read-only */
back_flags = flags;