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Subject[PATCH] block: simplify queue_next_fseq
We need to call blk_rq_init and elv_insert for all cases in queue_next_fseq,
so take these calls into common code. Also move the end_io initialization
from queue_flush into queue_next_fseq and rename queue_flush to
init_flush_request now that it's old name doesn't apply anymore.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: linux-2.6/block/blk-flush.c
===================================================================
--- linux-2.6.orig/block/blk-flush.c 2010-08-17 15:34:27.864004351 +0200
+++ linux-2.6/block/blk-flush.c 2010-08-17 16:12:53.504253827 +0200
@@ -74,16 +74,11 @@ static void post_flush_end_io(struct req
blk_flush_complete_seq(rq->q, QUEUE_FSEQ_POSTFLUSH, error);
}

-static void queue_flush(struct request_queue *q, struct request *rq,
- rq_end_io_fn *end_io)
+static void init_flush_request(struct request *rq, struct gendisk *disk)
{
- blk_rq_init(q, rq);
rq->cmd_type = REQ_TYPE_FS;
rq->cmd_flags = REQ_FLUSH;
- rq->rq_disk = q->orig_flush_rq->rq_disk;
- rq->end_io = end_io;
-
- elv_insert(q, rq, ELEVATOR_INSERT_FRONT);
+ rq->rq_disk = disk;
}

static struct request *queue_next_fseq(struct request_queue *q)
@@ -91,29 +86,28 @@ static struct request *queue_next_fseq(s
struct request *orig_rq = q->orig_flush_rq;
struct request *rq = &q->flush_rq;

+ blk_rq_init(q, rq);
+
switch (blk_flush_cur_seq(q)) {
case QUEUE_FSEQ_PREFLUSH:
- queue_flush(q, rq, pre_flush_end_io);
+ init_flush_request(rq, orig_rq->rq_disk);
+ rq->end_io = pre_flush_end_io;
break;
-
case QUEUE_FSEQ_DATA:
- /* initialize proxy request, inherit FLUSH/FUA and queue it */
- blk_rq_init(q, rq);
init_request_from_bio(rq, orig_rq->bio);
rq->cmd_flags &= ~(REQ_FLUSH | REQ_FUA);
rq->cmd_flags |= orig_rq->cmd_flags & (REQ_FLUSH | REQ_FUA);
rq->end_io = flush_data_end_io;
-
- elv_insert(q, rq, ELEVATOR_INSERT_FRONT);
break;
-
case QUEUE_FSEQ_POSTFLUSH:
- queue_flush(q, rq, post_flush_end_io);
+ init_flush_request(rq, orig_rq->rq_disk);
+ rq->end_io = post_flush_end_io;
break;
-
default:
BUG();
}
+
+ elv_insert(q, rq, ELEVATOR_INSERT_FRONT);
return rq;
}


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