On Wed, Dec 16, 2015 at 12:14 AM, John Ferlan <jferlan@xxxxxxxxxx> wrote:
> From: Matthias Gatto <matthias.gatto@xxxxxxxxxxxx>
>
> Add a new helper - virStorageSourceGetBackingStore - to fetch the storage
> source backingStore pointer in order to make it easier to change the
> future format of the data.
>
> A future patch will adjust the backingStore pointer to become a table or
> array of backingStorePtr's accessible by the argument 'pos'.
>
> For now, if 'pos' > 0, the code will return NULL as if the backingStore
> pointer didn't exist. All callers in subsequent patches will start by
> passing a 0 as the parameter.
>
> Signed-off-by: Matthias Gatto <matthias.gatto@xxxxxxxxxxxx>
> Signed-off-by: John Ferlan <jferlan@xxxxxxxxxx>
> ---
> src/libvirt_private.syms | 1 +
> src/util/virstoragefile.c | 23 +++++++++++++++++++++++
> src/util/virstoragefile.h | 3 +++
> 3 files changed, 27 insertions(+)
>
> diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
> index 55822ae..1c55370 100644
> --- a/src/libvirt_private.syms
> +++ b/src/libvirt_private.syms
> @@ -2196,6 +2196,7 @@ virStorageSourceClear;
> virStorageSourceCopy;
> virStorageSourceFree;
> virStorageSourceGetActualType;
> +virStorageSourceGetBackingStore;
> virStorageSourceGetSecurityLabelDef;
> virStorageSourceInitChainElement;
> virStorageSourceIsEmpty;
> diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
> index 2aa1d90..2771c95 100644
> --- a/src/util/virstoragefile.c
> +++ b/src/util/virstoragefile.c
> @@ -1810,6 +1810,29 @@ virStorageSourcePoolDefCopy(const virStorageSourcePoolDef *src)
>
>
> /**
> + * virStorageSourceGetBackingStore:
> + * @src: virStorageSourcePtr containing the backing stores
> + * @pos: presently unused
> + *
> + * Return the @src backingStore pointer at @pos. For now, @pos is
> + * expected to be 0. A future patch will use @pos index into an array
> + * of storage backingStore pointers
> + *
> + * Returns:
> + * A pointer to the storage source backingStore @pos or
> + * NULL if the backingStore pointer cannot be found
> + */
> +virStorageSourcePtr
> +virStorageSourceGetBackingStore(const virStorageSource *src,
> + size_t pos)
> +{
> + if (!src || pos > 0)
> + return NULL;
> + return src->backingStore;
> +}
> +
> +
> +/**
> * virStorageSourcePtr:
> *
> * Deep-copies a virStorageSource structure. If @backing chain is true
> diff --git a/src/util/virstoragefile.h b/src/util/virstoragefile.h
> index b98fe25..8cd4854 100644
> --- a/src/util/virstoragefile.h
> +++ b/src/util/virstoragefile.h
> @@ -289,6 +289,9 @@ struct _virStorageSource {
> # define DEV_BSIZE 512
> # endif
>
> +virStorageSourcePtr virStorageSourceGetBackingStore(const virStorageSource *src,
> + size_t pos);
> +
> int virStorageFileProbeFormat(const char *path, uid_t uid, gid_t gid);
> int virStorageFileProbeFormatFromBuf(const char *path,
> char *buf,
> --
> 2.5.0
>
ping
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