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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 12-11-2007, 09:41 PM
Kiyoshi Ueda
 
Default blk_end_request: changing block layer core (take 4)

This patch converts core parts of block layer to use blk_end_request
interfaces. Related 'uptodate' arguments are converted to 'error'.

'dequeue' argument was originally introduced for end_dequeued_request(),
where no attempt should be made to dequeue the request as it's already
dequeued.
However, it's not necessary as it can be checked with
list_empty(&rq->queuelist).
(Dequeued request has empty list and queued request doesn't.)
And it has been done in blk_end_request interfaces.

As a result of this patch, end_queued_request() and
end_dequeued_request() become identical. A future patch will merge
and rename them and change users of those functions.

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 | 35 +++++++++++++++--------------------
1 files changed, 15 insertions(+), 20 deletions(-)

Index: 2.6.24-rc4/block/ll_rw_blk.c
================================================== =================
--- 2.6.24-rc4.orig/block/ll_rw_blk.c
+++ 2.6.24-rc4/block/ll_rw_blk.c
@@ -347,7 +347,6 @@ unsigned blk_ordered_req_seq(struct requ
void blk_ordered_complete_seq(struct request_queue *q, unsigned seq, int error)
{
struct request *rq;
- int uptodate;

if (error && !q->orderr)
q->orderr = error;
@@ -361,15 +360,11 @@ void blk_ordered_complete_seq(struct req
/*
* Okay, sequence complete.
*/
- uptodate = 1;
- if (q->orderr)
- uptodate = q->orderr;
-
q->ordseq = 0;
rq = q->orig_bar_rq;

- end_that_request_first(rq, uptodate, rq->hard_nr_sectors);
- end_that_request_last(rq, uptodate);
+ if (__blk_end_request(rq, q->orderr, blk_rq_bytes(rq)))
+ BUG();
}

static void pre_flush_end_io(struct request *rq, int error)
@@ -486,9 +481,9 @@ int blk_do_ordered(struct request_queue
* ORDERED_NONE while this request is on it.
*/
blkdev_dequeue_request(rq);
- end_that_request_first(rq, -EOPNOTSUPP,
- rq->hard_nr_sectors);
- end_that_request_last(rq, -EOPNOTSUPP);
+ if (__blk_end_request(rq, -EOPNOTSUPP,
+ blk_rq_bytes(rq)))
+ BUG();
*rqp = NULL;
return 0;
}
@@ -3691,14 +3686,14 @@ void end_that_request_last(struct reques
EXPORT_SYMBOL(end_that_request_last);

static inline void __end_request(struct request *rq, int uptodate,
- unsigned int nr_bytes, int dequeue)
+ unsigned int nr_bytes)
{
- if (!end_that_request_chunk(rq, uptodate, nr_bytes)) {
- if (dequeue)
- blkdev_dequeue_request(rq);
- add_disk_randomness(rq->rq_disk);
- end_that_request_last(rq, uptodate);
- }
+ int error = 0;
+
+ if (uptodate <= 0)
+ error = uptodate ? uptodate : -EIO;
+
+ __blk_end_request(rq, error, nr_bytes);
}

/**
@@ -3741,7 +3736,7 @@ EXPORT_SYMBOL_GPL(blk_rq_cur_bytes);
**/
void end_queued_request(struct request *rq, int uptodate)
{
- __end_request(rq, uptodate, blk_rq_bytes(rq), 1);
+ __end_request(rq, uptodate, blk_rq_bytes(rq));
}
EXPORT_SYMBOL(end_queued_request);

@@ -3758,7 +3753,7 @@ EXPORT_SYMBOL(end_queued_request);
**/
void end_dequeued_request(struct request *rq, int uptodate)
{
- __end_request(rq, uptodate, blk_rq_bytes(rq), 0);
+ __end_request(rq, uptodate, blk_rq_bytes(rq));
}
EXPORT_SYMBOL(end_dequeued_request);

@@ -3784,7 +3779,7 @@ EXPORT_SYMBOL(end_dequeued_request);
**/
void end_request(struct request *req, int uptodate)
{
- __end_request(req, uptodate, req->hard_cur_sectors << 9, 1);
+ __end_request(req, uptodate, req->hard_cur_sectors << 9);
}
EXPORT_SYMBOL(end_request);


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