linux-kernel - [PATCH 1/2] lib/scatterlist: export sg_miter

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Message-Id: <1383062842-28453-1-git-send-email-ming.lei@canonical.com>
Date:	Wed, 30 Oct 2013 00:07:22 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Tejun Heo <tj@...nel.org>, Jens Axboe <axboe@...nel.dk>,
	Matthew Dharm <mdharm-usb@...-eyed-alien.net>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	USB list <linux-usb@...r.kernel.org>,
	Ming Lei <ming.lei@...onical.com>
Subject: [PATCH 1/2] 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.

Cc: Andrew Morton <akpm@...ux-foundation.org>,
Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Cc: Tejun Heo <tj@...nel.org>,
Cc: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Ming Lei <ming.lei@...onical.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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