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[dm-devel] RE: [PATCH 6/7] blk_end_request: remove/unexport end_that_request_*



Boaz raised my attention to this patchset today...
We suspect we'll still need the extern entry points for handling the bidi 
request in the scsi_io_completion() path as we only want to call
end_that_request_chunk on req->next_rq and never
end_that_request_last.
 
(see 
http://www.bhalevy.com/open-osd/download/linux-2.6.23-rc2_and_iscsi-iscsi-2007_08_09/0005-SCSI-bidi-support.patch)
 
If this is ok with you I'd leave these entry points in place rather than
taking them out and putting them back in later.
 
Benny

________________________________

From: linux-scsi-owner vger kernel org on behalf of Kiyoshi Ueda
Sent: Sat 2007-09-01 01:43
To: linux-kernel vger kernel org; linux-scsi vger kernel org; linux-ide vger kernel org; jens axboe oracle com; mike miller hp com; grant likely secretlab ca
Cc: dm-devel redhat com; j-nomura ce jp nec com; k-ueda ct jp nec com
Subject: [PATCH 6/7] blk_end_request: remove/unexport end_that_request_*



This patch removes the following functions:
  o end_that_request_first()
  o end_that_request_chunk()
and stops exporting the functions below:
  o end_that_request_last()

Signed-off-by: Kiyoshi Ueda <k-ueda ct jp nec com>
Signed-off-by: Jun'ichi Nomura <j-nomura ce jp nec com>
---
 block/ll_rw_blk.c      |   61 ++++++++++++------------------------------------- include/linux/blkdev.h |   15 ++++--------
 2 files changed, 21 insertions(+), 55 deletions(-)

diff -rupN 05-ide-cd-change/block/ll_rw_blk.c 06-remove-old-interface/block/ll_rw_blk.c
--- 05-ide-cd-change/block/ll_rw_blk.c  2007-08-24 12:11:02.000000000 -0400
+++ 06-remove-old-interface/block/ll_rw_blk.c   2007-08-24 12:19:02.000000000 -0400
@@ -3388,6 +3388,20 @@ static void blk_recalc_rq_sectors(struct
        }
 }

+/**
+ * __end_that_request_first - end I/O on a request
+ * @req:      the request being processed
+ * @uptodate: 1 for success, 0 for I/O error, < 0 for specific error
+ * @nr_bytes: number of bytes to complete
+ *
+ * Description:
+ *     Ends I/O on a number of bytes attached to @req, and sets it up
+ *     for the next range of segments (if any) in the cluster.
+ *
+ * Return:
+ *     0 - we are done with this request, call end_that_request_last()
+ *     1 - still buffers pending for this request
+ **/
 static int __end_that_request_first(struct request *req, int uptodate,
                                    int nr_bytes)
 {
@@ -3498,49 +3512,6 @@ static int __end_that_request_first(stru
        return 1;
 }

-/**
- * end_that_request_first - end I/O on a request
- * @req:      the request being processed
- * @uptodate: 1 for success, 0 for I/O error, < 0 for specific error
- * @nr_sectors: number of sectors to end I/O on
- *
- * Description:
- *     Ends I/O on a number of sectors attached to @req, and sets it up
- *     for the next range of segments (if any) in the cluster.
- *
- * Return:
- *     0 - we are done with this request, call end_that_request_last()
- *     1 - still buffers pending for this request
- **/
-int end_that_request_first(struct request *req, int uptodate, int nr_sectors)
-{
-       return __end_that_request_first(req, uptodate, nr_sectors << 9);
-}
-
-EXPORT_SYMBOL(end_that_request_first);
-
-/**
- * end_that_request_chunk - end I/O on a request
- * @req:      the request being processed
- * @uptodate: 1 for success, 0 for I/O error, < 0 for specific error
- * @nr_bytes: number of bytes to complete
- *
- * Description:
- *     Ends I/O on a number of bytes attached to @req, and sets it up
- *     for the next range of segments (if any). Like end_that_request_first(),
- *     but deals with bytes instead of sectors.
- *
- * Return:
- *     0 - we are done with this request, call end_that_request_last()
- *     1 - still buffers pending for this request
- **/
-int end_that_request_chunk(struct request *req, int uptodate, int nr_bytes)
-{
-       return __end_that_request_first(req, uptodate, nr_bytes);
-}
-
-EXPORT_SYMBOL(end_that_request_chunk);
-
 /*
  * splice the completion data to a local structure and hand off to
  * process_completion_queue() to complete the requests
@@ -3620,7 +3591,7 @@ EXPORT_SYMBOL(blk_complete_request);
 /*
  * queue lock must be held
  */
-void end_that_request_last(struct request *req, int uptodate)
+static void end_that_request_last(struct request *req, int uptodate)
 {
        struct gendisk *disk = req->rq_disk;
        int error;
@@ -3655,8 +3626,6 @@ void end_that_request_last(struct reques
                __blk_put_request(req->q, req);
 }

-EXPORT_SYMBOL(end_that_request_last);
-
 void end_request(struct request *req, int uptodate)
 {
        __blk_end_request(req, uptodate, sect2byte(req->hard_cur_sectors));
diff -rupN 05-ide-cd-change/include/linux/blkdev.h 06-remove-old-interface/include/linux/blkdev.h
--- 05-ide-cd-change/include/linux/blkdev.h     2007-08-24 12:21:45.000000000 -0400
+++ 06-remove-old-interface/include/linux/blkdev.h      2007-08-24 12:21:15.000000000 -0400
@@ -720,19 +720,16 @@ static inline void blk_run_address_space
 }

 /*
- * end_request() and friends. Must be called with the request queue spinlock
- * acquired. All functions called within end_request() _must_be_ atomic.
+ * blk_end_request() and friends.
+ * __blk_end_request() and end_request() must be called with
+ * the request queue spinlock acquired.
  *
  * Several drivers define their own end_request and call
- * end_that_request_first() and end_that_request_last()
- * for parts of the original function. This prevents
- * code duplication in drivers.
+ * blk_end_request() for parts of the original function.
+ * This prevents code duplication in drivers.
  */
 extern int blk_end_request(struct request *rq, int uptodate, int nr_bytes);
 extern int __blk_end_request(struct request *rq, int uptodate, int nr_bytes);
-extern int end_that_request_first(struct request *, int, int);
-extern int end_that_request_chunk(struct request *, int, int);
-extern void end_that_request_last(struct request *, int);
 extern void end_request(struct request *req, int uptodate);
 extern int blk_end_request_callback(struct request *rq, int uptodate,
                                    int nr_bytes,
@@ -749,7 +746,7 @@ extern void blk_complete_request(struct
 #define blk_rq_cur_size(rq) (sect2byte((rq)->current_nr_sectors))

 /*
- * end_that_request_first/chunk() takes an uptodate argument. we account
+ * blk_end_request() takes an uptodate argument. we account
  * any value <= as an io error. 0 means -EIO for compatability reasons,
  * any other < 0 value is the direct error type. An uptodate value of
  * 1 indicates successful io completion
-
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