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Message-Id: <20090515163416M.fujita.tomonori@lab.ntt.co.jp>
Date: Fri, 15 May 2009 16:35:19 +0900
From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To: jens.axboe@...cle.com
Cc: linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
tj@...nel.org, James.Bottomley@...senPartnership.com,
bharrosh@...asas.com
Subject: [PATCH] block: remove blk_end_bidi_request and
__blk_end_bidi_request
The block core does:
- blk_end_request and blk_end_request_all calls blk_end_bidi_request.
- __blk_end_request and __blk_end_request_all calls __blk_end_bidi_request.
The bidi name is confusing since all the callers are generic
completion functions.
A bidi request must be completed as a whole so let's reorganize the
functions a bit:
- blk_end_request_all calls blk_end_request, __blk_end_request_all
calls __blk_end_request
- blk_end_request and __blk_end_request complete a bidi request as a
whole because we always have to complete a bidi request as a whole.
It might be better to change blk_update_bidi_request too since we
can't update a bidi request.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
---
block/blk-core.c | 94 +++++++++++++++---------------------------------------
1 files changed, 26 insertions(+), 68 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index a2d97de..2c6d0ec 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1972,7 +1972,6 @@ static bool blk_update_bidi_request(struct request *rq, int error,
if (blk_update_request(rq, error, nr_bytes))
return true;
- /* Bidi request must be completed as a whole */
if (unlikely(blk_bidi_rq(rq)) &&
blk_update_request(rq->next_rq, error, bidi_bytes))
return true;
@@ -2010,27 +2009,28 @@ static void blk_finish_request(struct request *req, int error)
}
/**
- * blk_end_bidi_request - Complete a bidi request
- * @rq: the request to complete
- * @error: %0 for success, < %0 for error
- * @nr_bytes: number of bytes to complete @rq
- * @bidi_bytes: number of bytes to complete @rq->next_rq
+ * blk_end_request - Helper function for drivers to complete the request.
+ * @rq: the request being processed
+ * @error: %0 for success, < %0 for error
+ * @nr_bytes: number of bytes to complete
*
* Description:
- * Ends I/O on a number of bytes attached to @rq and @rq->next_rq.
- * Drivers that supports bidi can safely call this member for any
- * type of request, bidi or uni. In the later case @bidi_bytes is
- * just ignored.
+ * Ends I/O on a number of bytes attached to @rq.
+ * If @rq has leftover, sets it up for the next range of segments.
*
* Return:
* %false - we are done with this request
* %true - still buffers pending for this request
**/
-static bool blk_end_bidi_request(struct request *rq, int error,
- unsigned int nr_bytes, unsigned int bidi_bytes)
+bool blk_end_request(struct request *rq, int error, unsigned int nr_bytes)
{
struct request_queue *q = rq->q;
unsigned long flags;
+ unsigned int bidi_bytes = 0;
+ bool pending;
+
+ if (unlikely(blk_bidi_rq(rq)))
+ bidi_bytes = blk_rq_bytes(rq->next_rq);
if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes))
return true;
@@ -2041,51 +2041,6 @@ static bool blk_end_bidi_request(struct request *rq, int error,
return false;
}
-
-/**
- * __blk_end_bidi_request - Complete a bidi request with queue lock held
- * @rq: the request to complete
- * @error: %0 for success, < %0 for error
- * @nr_bytes: number of bytes to complete @rq
- * @bidi_bytes: number of bytes to complete @rq->next_rq
- *
- * Description:
- * Identical to blk_end_bidi_request() except that queue lock is
- * assumed to be locked on entry and remains so on return.
- *
- * Return:
- * %false - we are done with this request
- * %true - still buffers pending for this request
- **/
-static bool __blk_end_bidi_request(struct request *rq, int error,
- unsigned int nr_bytes, unsigned int bidi_bytes)
-{
- if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes))
- return true;
-
- blk_finish_request(rq, error);
-
- return false;
-}
-
-/**
- * blk_end_request - Helper function for drivers to complete the request.
- * @rq: the request being processed
- * @error: %0 for success, < %0 for error
- * @nr_bytes: number of bytes to complete
- *
- * Description:
- * Ends I/O on a number of bytes attached to @rq.
- * If @rq has leftover, sets it up for the next range of segments.
- *
- * Return:
- * %false - we are done with this request
- * %true - still buffers pending for this request
- **/
-bool blk_end_request(struct request *rq, int error, unsigned int nr_bytes)
-{
- return blk_end_bidi_request(rq, error, nr_bytes, 0);
-}
EXPORT_SYMBOL_GPL(blk_end_request);
/**
@@ -2099,12 +2054,8 @@ EXPORT_SYMBOL_GPL(blk_end_request);
void blk_end_request_all(struct request *rq, int error)
{
bool pending;
- unsigned int bidi_bytes = 0;
-
- if (unlikely(blk_bidi_rq(rq)))
- bidi_bytes = blk_rq_bytes(rq->next_rq);
- pending = blk_end_bidi_request(rq, error, blk_rq_bytes(rq), bidi_bytes);
+ pending = blk_end_request(rq, error, blk_rq_bytes(rq));
BUG_ON(pending);
}
EXPORT_SYMBOL_GPL(blk_end_request_all);
@@ -2142,7 +2093,18 @@ EXPORT_SYMBOL_GPL(blk_end_request_cur);
**/
bool __blk_end_request(struct request *rq, int error, unsigned int nr_bytes)
{
- return __blk_end_bidi_request(rq, error, nr_bytes, 0);
+ bool pending;
+ unsigned int bidi_bytes = 0;
+
+ if (unlikely(blk_bidi_rq(rq)))
+ bidi_bytes = blk_rq_bytes(rq->next_rq);
+
+ if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes))
+ return true;
+
+ blk_finish_request(rq, error);
+
+ return false;
}
EXPORT_SYMBOL_GPL(__blk_end_request);
@@ -2157,12 +2119,8 @@ EXPORT_SYMBOL_GPL(__blk_end_request);
void __blk_end_request_all(struct request *rq, int error)
{
bool pending;
- unsigned int bidi_bytes = 0;
-
- if (unlikely(blk_bidi_rq(rq)))
- bidi_bytes = blk_rq_bytes(rq->next_rq);
- pending = __blk_end_bidi_request(rq, error, blk_rq_bytes(rq), bidi_bytes);
+ pending = __blk_end_request(rq, error, blk_rq_bytes(rq));
BUG_ON(pending);
}
EXPORT_SYMBOL_GPL(__blk_end_request_all);
--
1.6.0.6
--
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