Re: [Qemu-devel] [PATCH v3 2/5] block: JSON filenames and relative backing files

[Eric Blake]

On 11/24/2014 02:43 AM, Max Reitz wrote:
> When using a relative backing file name, qemu needs to know the
> directory of the top image file. For JSON filenames, such a directory
> cannot be easily determined (e.g. how do you determine the directory of
> a qcow2 BDS directly on top of a quorum BDS?). Therefore, do not allow
> relative filenames for the backing file of BDSs only having a JSON
> filename.
> 
> Furthermore, BDS::exact_filename should be used whenever possible. If
> BDS::filename is not equal to BDS::exact_filename, the former will
> always be a JSON object.
> 
> Signed-off-by: Max Reitz <address@hidden>
> ---
>  block.c               | 27 +++++++++++++++++++++------
>  block/qapi.c          |  7 ++++++-
>  include/block/block.h |  5 +++--
>  3 files changed, 30 insertions(+), 9 deletions(-)
> 
> diff --git a/block.c b/block.c
> index 0c1be37..a0cddcd 100644
> --- a/block.c
> +++ b/block.c
> @@ -305,19 +305,28 @@ void path_combine(char *dest, int dest_size,
>  
>  void bdrv_get_full_backing_filename_from_filename(const char *backed,
>                                                    const char *backing,
> -                                                  char *dest, size_t sz)
> +                                                  char *dest, size_t sz,
> +                                                  Error **errp)
>  {
> -    if (backing[0] == '\0' || path_has_protocol(backing)) {
> +    if (backing[0] == '\0' || path_has_protocol(backing) ||
> +        path_is_absolute(backing))
> +    {

checkpatch.pl didn't complain about this?  The { should be on the
previous line.  With that fixed,
Reviewed-by: Eric Blake <address@hidden>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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