linux-kernel - [PATCH v2 6/6] block: loop: don't handle REQ

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Message-Id: <1409414907-22238-7-git-send-email-ming.lei@canonical.com>
Date:	Sun, 31 Aug 2014 00:08:27 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	Dave Kleikamp <dave.kleikamp@...cle.com>
Cc:	Zach Brown <zab@...bo.net>, Christoph Hellwig <hch@...radead.org>,
	Maxim Patlasov <mpatlasov@...allels.com>,
	Ming Lei <ming.lei@...onical.com>
Subject: [PATCH v2 6/6] block: loop: don't handle REQ_FUA explicitly

block core handles REQ_FUA by its flush state machine, so
won't do it in loop explicitly.

Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
 drivers/block/loop.c |   14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index d7cdb60..74ad96b 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -457,23 +457,15 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq)
 	pos = ((loff_t) blk_rq_pos(rq) << 9) + lo->lo_offset;
 
 	if (rq->cmd_flags & REQ_WRITE) {
-
 		if (rq->cmd_flags & REQ_FLUSH)
 			ret = lo_req_flush(lo, rq);
-
-		if (rq->cmd_flags & REQ_DISCARD) {
+		else if (rq->cmd_flags & REQ_DISCARD)
 			ret = lo_discard(lo, rq, pos);
-			goto out;
-		}
-
-		ret = lo_send(lo, rq, pos);
-
-		if ((rq->cmd_flags & REQ_FUA) && !ret)
-			ret = lo_req_flush(lo, rq);
+		else
+			ret = lo_send(lo, rq, pos);
 	} else
 		ret = lo_receive(lo, rq, lo->lo_blocksize, pos);
 
-out:
 	return ret;
 }
 
-- 
1.7.9.5

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