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Commit 0d6077f8 authored by Ming Lei's avatar Ming Lei Committed by Greg Kroah-Hartman
Browse files

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: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarMing Lei <ming.lei@canonical.com>
Reviewed-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e05a1fd9

include/linux/scatterlist.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

lib/scatterlist.c

+2 −1
Original line number Diff line number Diff line
@@ -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