Messages in this thread Patch in this message | | | From | Ming Lei <> | Subject | [PATCH 1/2] lib/scatterlist: export sg_miter_skip() | Date | Wed, 30 Oct 2013 00:07:22 +0800 |
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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.
Cc: Andrew Morton <akpm@linux-foundation.org>, Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>, Cc: Tejun Heo <tj@kernel.org>, Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Ming Lei <ming.lei@canonical.com> --- include/linux/scatterlist.h | 1 + lib/scatterlist.c | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index adae88f..a964f72 100644 --- 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 -- 1.7.9.5
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