linux-kernel - [PATCH 17/41] block: use REQ_FLUSH in blkdev_issue

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Message-Id: <1283509796-1510-18-git-send-email-tj@kernel.org>
Date:	Fri,  3 Sep 2010 12:29:32 +0200
From:	Tejun Heo <tj@...nel.org>
To:	jaxboe@...ionio.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-raid@...r.kernel.org,
	dm-devel@...hat.com, hch@....de, konishi.ryusuke@....ntt.co.jp,
	James.Bottomley@...e.de, tytso@....edu, chris.mason@...cle.com,
	swhiteho@...hat.com, vst@...b.net, jack@...e.cz,
	rwheeler@...hat.com, hare@...e.de, neilb@...e.de,
	rusty@...tcorp.com.au, mst@...hat.com, snitzer@...hat.com,
	k-ueda@...jp.nec.com, mpatocka@...hat.com
Cc:	Tejun Heo <tj@...nel.org>, Christoph Hellwig <hch@...radead.org>
Subject: [PATCH 17/41] block: use REQ_FLUSH in blkdev_issue_flush()

Update blkdev_issue_flush() to use new REQ_FLUSH interface.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Christoph Hellwig <hch@...radead.org>
---
 block/blk-flush.c |   17 ++++++-----------
 1 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/block/blk-flush.c b/block/blk-flush.c
index 7d1fc98..62b7df9 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -191,13 +191,10 @@ struct request *blk_do_flush(struct request_queue *q, struct request *rq)
 	return blk_flush_complete_seq(q, skip, 0);
 }
 
-static void bio_end_empty_barrier(struct bio *bio, int err)
+static void bio_end_flush(struct bio *bio, int err)
 {
-	if (err) {
-		if (err == -EOPNOTSUPP)
-			set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
+	if (err)
 		clear_bit(BIO_UPTODATE, &bio->bi_flags);
-	}
 	if (bio->bi_private)
 		complete(bio->bi_private);
 	bio_put(bio);
@@ -235,19 +232,19 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
 	 * some block devices may not have their queue correctly set up here
 	 * (e.g. loop device without a backing file) and so issuing a flush
 	 * here will panic. Ensure there is a request function before issuing
-	 * the barrier.
+	 * the flush.
 	 */
 	if (!q->make_request_fn)
 		return -ENXIO;
 
 	bio = bio_alloc(gfp_mask, 0);
-	bio->bi_end_io = bio_end_empty_barrier;
+	bio->bi_end_io = bio_end_flush;
 	bio->bi_bdev = bdev;
 	if (test_bit(BLKDEV_WAIT, &flags))
 		bio->bi_private = &wait;
 
 	bio_get(bio);
-	submit_bio(WRITE_BARRIER, bio);
+	submit_bio(WRITE_FLUSH, bio);
 	if (test_bit(BLKDEV_WAIT, &flags)) {
 		wait_for_completion(&wait);
 		/*
@@ -259,9 +256,7 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
 			*error_sector = bio->bi_sector;
 	}
 
-	if (bio_flagged(bio, BIO_EOPNOTSUPP))
-		ret = -EOPNOTSUPP;
-	else if (!bio_flagged(bio, BIO_UPTODATE))
+	if (!bio_flagged(bio, BIO_UPTODATE))
 		ret = -EIO;
 
 	bio_put(bio);
-- 
1.7.1

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