On Wed, 30 Oct 2013 00:07:22 +0800 Ming Lei <ming.lei@xxxxxxxxxxxxx> wrote:
> sg_copy_buffer() can't meet demand for some drrivers(such usb
> mass storage), so we have to use the sg_miter_* APIs to access
> sg buffer, then need export sg_miter_skip() for these drivers.
>
> The API is needed for converting to sg_miter_* APIs in USB storage
> driver for accessing sg buffer.
>
> ...
>
> --- a/include/linux/scatterlist.h
> +++ b/include/linux/scatterlist.h
> @@ -345,6 +345,7 @@ struct sg_mapping_iter {
>
> void sg_miter_start(struct sg_mapping_iter *miter, struct scatterlist *sgl,
> unsigned int nents, unsigned int flags);
> +bool sg_miter_skip(struct sg_mapping_iter *miter, off_t offset);
> bool sg_miter_next(struct sg_mapping_iter *miter);
> void sg_miter_stop(struct sg_mapping_iter *miter);
>
> diff --git a/lib/scatterlist.c b/lib/scatterlist.c
> index d16fa29..3a8e8e8 100644
> --- a/lib/scatterlist.c
> +++ b/lib/scatterlist.c
> @@ -495,7 +495,7 @@ static bool sg_miter_get_next_page(struct sg_mapping_iter *miter)
> * true if @miter contains the valid mapping. false if end of sg
> * list is reached.
> */
> -static bool sg_miter_skip(struct sg_mapping_iter *miter, off_t offset)
> +bool sg_miter_skip(struct sg_mapping_iter *miter, off_t offset)
> {
> sg_miter_stop(miter);
>
> @@ -513,6 +513,7 @@ static bool sg_miter_skip(struct sg_mapping_iter *miter, off_t offset)
>
> return true;
> }
> +EXPORT_SYMBOL(sg_miter_skip);
>
> /**
> * sg_miter_next - proceed mapping iterator to the next mapping
Looks OK to me. Please include this in whatever tree is used to merge
"[PATCH 2/2] USB: storage: use sg_miter_* APIs to access scsi buffer".
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