linux-kernel - [PATCH 01/17] blk-map: move blk_rq_map_user() below blk_rq_map_user

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Date:	Wed,  1 Apr 2009 22:44:16 +0900
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk, bharrosh@...asas.com,
	linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp
Cc:	Tejun Heo <tj@...nel.org>
Subject: [PATCH 01/17] blk-map: move blk_rq_map_user() below blk_rq_map_user_iov()

Impact: code reorganization

blk_rq_map_user() is about to be reimplemented using
blk_rq_map_user_iov().  Move it below blk_rq_map_user_iov() so that
the actual conversion patch is easier to read.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 block/blk-map.c |   70 +++++++++++++++++++++++++++---------------------------
 1 files changed, 35 insertions(+), 35 deletions(-)

diff --git a/block/blk-map.c b/block/blk-map.c
index a43c93c..fdef591 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -41,41 +41,6 @@ static int __blk_rq_unmap_user(struct bio *bio)
 }
 
 /**
- * blk_rq_map_user - map user data to a request, for REQ_TYPE_BLOCK_PC usage
- * @q:		request queue where request should be inserted
- * @rq:		request structure to fill
- * @map_data:   pointer to the rq_map_data holding pages (if necessary)
- * @ubuf:	the user buffer
- * @len:	length of user data
- * @gfp_mask:	memory allocation flags
- *
- * Description:
- *    Data will be mapped directly for zero copy I/O, if possible. Otherwise
- *    a kernel bounce buffer is used.
- *
- *    A matching blk_rq_unmap_user() must be issued at the end of I/O, while
- *    still in process context.
- *
- *    Note: The mapped bio may need to be bounced through blk_queue_bounce()
- *    before being submitted to the device, as pages mapped may be out of
- *    reach. It's the callers responsibility to make sure this happens. The
- *    original bio must be passed back in to blk_rq_unmap_user() for proper
- *    unmapping.
- */
-int blk_rq_map_user(struct request_queue *q, struct request *rq,
-		    struct rq_map_data *map_data, void __user *ubuf,
-		    unsigned long len, gfp_t gfp_mask)
-{
-	struct sg_iovec iov;
-
-	iov.iov_base = ubuf;
-	iov.iov_len = len;
-
-	return blk_rq_map_user_iov(q, rq, map_data, &iov, 1, len, gfp_mask);
-}
-EXPORT_SYMBOL(blk_rq_map_user);
-
-/**
  * blk_rq_map_user_iov - map user data to a request, for REQ_TYPE_BLOCK_PC usage
  * @q:		request queue where request should be inserted
  * @rq:		request to map data to
@@ -151,6 +116,41 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
 EXPORT_SYMBOL(blk_rq_map_user_iov);
 
 /**
+ * blk_rq_map_user - map user data to a request, for REQ_TYPE_BLOCK_PC usage
+ * @q:		request queue where request should be inserted
+ * @rq:		request structure to fill
+ * @map_data:   pointer to the rq_map_data holding pages (if necessary)
+ * @ubuf:	the user buffer
+ * @len:	length of user data
+ * @gfp_mask:	memory allocation flags
+ *
+ * Description:
+ *    Data will be mapped directly for zero copy I/O, if possible. Otherwise
+ *    a kernel bounce buffer is used.
+ *
+ *    A matching blk_rq_unmap_user() must be issued at the end of I/O, while
+ *    still in process context.
+ *
+ *    Note: The mapped bio may need to be bounced through blk_queue_bounce()
+ *    before being submitted to the device, as pages mapped may be out of
+ *    reach. It's the callers responsibility to make sure this happens. The
+ *    original bio must be passed back in to blk_rq_unmap_user() for proper
+ *    unmapping.
+ */
+int blk_rq_map_user(struct request_queue *q, struct request *rq,
+		    struct rq_map_data *map_data, void __user *ubuf,
+		    unsigned long len, gfp_t gfp_mask)
+{
+	struct sg_iovec iov;
+
+	iov.iov_base = ubuf;
+	iov.iov_len = len;
+
+	return blk_rq_map_user_iov(q, rq, map_data, &iov, 1, len, gfp_mask);
+}
+EXPORT_SYMBOL(blk_rq_map_user);
+
+/**
  * blk_rq_unmap_user - unmap a request with user data
  * @bio:	       start of bio list
  *
-- 
1.6.0.2

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