linux-kernel - [PATCH 1/4] xen/blkfront: map REQ

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Date:	Tue,  2 Nov 2010 12:20:44 -0400
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Christoph Hellwig <hch@....de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Daniel Stodden <daniel.stodden@...rix.com>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 1/4] xen/blkfront: map REQ_FLUSH into a full barrier

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

Implement a flush as a full barrier, since we have nothing weaker.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Acked-by: Christoph Hellwig <hch@....de>
---
 drivers/block/xen-blkfront.c |   19 +++++--------------
 1 files changed, 5 insertions(+), 14 deletions(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 06e2812..3a318d8 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -245,14 +245,11 @@ static int blkif_ioctl(struct block_device *bdev, fmode_t mode,
 }
 
 /*
- * blkif_queue_request
+ * Generate a Xen blkfront IO request from a blk layer request.  Reads
+ * and writes are handled as expected.  Since we lack a loose flush
+ * request, we map flushes into a full ordered barrier.
  *
- * request block io
- *
- * id: for guest use only.
- * operation: BLKIF_OP_{READ,WRITE,PROBE}
- * buffer: buffer to read/write into. this should be a
- *   virtual address in the guest os.
+ * @req: a request struct
  */
 static int blkif_queue_request(struct request *req)
 {
@@ -289,7 +286,7 @@ static int blkif_queue_request(struct request *req)
 
 	ring_req->operation = rq_data_dir(req) ?
 		BLKIF_OP_WRITE : BLKIF_OP_READ;
-	if (req->cmd_flags & REQ_HARDBARRIER)
+	if (req->cmd_flags & REQ_FLUSH)
 		ring_req->operation = BLKIF_OP_WRITE_BARRIER;
 
 	ring_req->nr_segments = blk_rq_map_sg(req->q, req, info->sg);
@@ -1069,14 +1066,8 @@ static void blkfront_connect(struct blkfront_info *info)
 	 */
 	info->feature_flush = 0;
 
-	/*
-	 * The driver doesn't properly handled empty flushes, so
-	 * lets disable barrier support for now.
-	 */
-#if 0
 	if (!err && barrier)
 		info->feature_flush = REQ_FLUSH;
-#endif
 
 	err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size);
 	if (err) {
-- 
1.7.2.3

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