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lib/scatterlist: export sg_miter_skip() 

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.

Acked-by: Andrew Morton <akpm@linux-foundation.org>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ming Lei 2013-11-26 12:43:37 +08:00 committed by Greg Kroah-Hartman
parent e05a1fd946
commit 0d6077f8b4
2 changed files with 3 additions and 1 deletions
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1
include/linux/scatterlist.h
View File

@ -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);

3
lib/scatterlist.c
View File

@ -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