linux-kernel - [PATCH] xen-blkfront: check feature-persitent on resume

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Date:	Thu, 22 May 2014 16:40:07 +0200
From:	Roger Pau Monne <roger.pau@...rix.com>
To:	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>
CC:	Roger Pau Monne <roger.pau@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>
Subject: [PATCH] xen-blkfront: check feature-persitent on resume

We are missing a check to see if the backend supports persistent
grants on resume, meaning we will always run with the value fetched
from the firsts host on which we run on.

Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: David Vrabel <david.vrabel@...rix.com>
---
 drivers/block/xen-blkfront.c |   23 ++++++++++++++++-------
 1 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index efe1b47..00ae36b 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1430,6 +1430,20 @@ static void split_bio_end(struct bio *bio, int error)
 	bio_put(bio);
 }
 
+static void blkfront_setup_persistent(struct blkfront_info *info)
+{
+	unsigned int persistent;
+	int err;
+
+	err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
+			    "feature-persistent", "%u", &persistent,
+			    NULL);
+	if (err)
+		info->feature_persistent = 0;
+	else
+		info->feature_persistent = persistent;
+}
+
 static int blkif_recover(struct blkfront_info *info)
 {
 	int i;
@@ -1456,6 +1470,7 @@ static int blkif_recover(struct blkfront_info *info)
 	info->shadow_free = info->ring.req_prod_pvt;
 	info->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff;
 
+	blkfront_setup_persistent(info);
 	rc = blkfront_setup_indirect(info);
 	if (rc) {
 		kfree(copy);
@@ -1851,13 +1866,7 @@ static void blkfront_connect(struct blkfront_info *info)
 	if (!err && discard)
 		blkfront_setup_discard(info);
 
-	err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
-			    "feature-persistent", "%u", &persistent,
-			    NULL);
-	if (err)
-		info->feature_persistent = 0;
-	else
-		info->feature_persistent = persistent;
+	blkfront_setup_persistent(info);
 
 	err = blkfront_setup_indirect(info);
 	if (err) {
-- 
1.7.7.5 (Apple Git-26)

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