[Libguestfs] [nbdkit PATCH 2/4] filters: Utilize CLEANUP_EXTENTS_FREE

[Eric Blake]

On 4/23/19 2:06 PM, Eric Blake wrote:
> Now that cleanup.h is in common code, we can use it in our
> filters. The first round focuses just on places that called
> nbdkit_extents_free(), as all three callers had multiple exit paths
> that definitely benefit from the macro.
> 
> Signed-off-by: Eric Blake <eblake at redhat.com>
> ---
>  filters/offset/offset.c       | 13 +++++--------
>  filters/partition/partition.c | 12 ++++--------
>  filters/truncate/truncate.c   | 12 ++++--------
>  filters/offset/Makefile.am    |  5 ++++-
>  filters/partition/Makefile.am |  5 ++++-
>  filters/truncate/Makefile.am  |  5 ++++-
>  6 files changed, 25 insertions(+), 27 deletions(-)
> 


> @@ -322,20 +323,15 @@ truncate_extents (struct nbdkit_next_ops *next_ops, void *nxdata,
>      n = count;
>    else
>      n = real_size_copy - offset;
> -  if (next_ops->extents (nxdata, n, offset, flags, extents2, err) == -1) {
> -    nbdkit_extents_free (extents2);
> +  if (next_ops->extents (nxdata, n, offset, flags, extents2, err) == -1)
>      return -1;
> -  }
> 
>    for (i = 0; i < nbdkit_extents_count (extents2); ++i) {
>      struct nbdkit_extent e = nbdkit_get_extent (extents2, i);
> 
> -    if (nbdkit_add_extent (extents, e.offset, e.length, e.type) == -1) {
> -      nbdkit_extents_free (extents2);
> +    if (nbdkit_add_extent (extents, e.offset, e.length, e.type) == -1)
>        return -1;
> -    }

Of course, we have to re-add the {} if we fix nbdkit_add_extent() to set
reasonable errno so that we can '*err = errno' on failure...

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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