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authorJan Beulich <JBeulich@suse.com>2017-01-23 08:12:19 -0700
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2017-01-23 13:27:41 -0500
commitb32728ffef7f233dbdabb3f11814bdf692aaf501 (patch)
tree5bf0326545d0c4525a43f3c50cfcdef09f0baa88 /drivers/block/xen-blkfront.c
parentd61b7f972dab2a7d187c38254845546dfc8eed85 (diff)
downloadlinux-b32728ffef7f233dbdabb3f11814bdf692aaf501.tar.bz2
xen-blkfront: feature flags handling adjustments
Don't truncate the "feature-persistent" value read from xenstore: Any non-zero value is supposed to enable the feature, just like is already being done for feature_secdiscard. Just like the other feature_* fields, feature_flush and feature_fua are boolean flags, and hence fit well into a single bit. Keep all bit fields together to limit gaps. Signed-off-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/block/xen-blkfront.c')
-rw-r--r--drivers/block/xen-blkfront.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index b2bdfa81f929..386b17208605 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -197,13 +197,13 @@ struct blkfront_info
/* Number of pages per ring buffer. */
unsigned int nr_ring_pages;
struct request_queue *rq;
- unsigned int feature_flush;
- unsigned int feature_fua;
+ unsigned int feature_flush:1;
+ unsigned int feature_fua:1;
unsigned int feature_discard:1;
unsigned int feature_secdiscard:1;
+ unsigned int feature_persistent:1;
unsigned int discard_granularity;
unsigned int discard_alignment;
- unsigned int feature_persistent:1;
/* Number of 4KB segments handled */
unsigned int max_indirect_segments;
int is_ready;
@@ -2323,8 +2323,8 @@ static void blkfront_gather_backend_features(struct blkfront_info *info)
blkfront_setup_discard(info);
info->feature_persistent =
- xenbus_read_unsigned(info->xbdev->otherend,
- "feature-persistent", 0);
+ !!xenbus_read_unsigned(info->xbdev->otherend,
+ "feature-persistent", 0);
indirect_segments = xenbus_read_unsigned(info->xbdev->otherend,
"feature-max-indirect-segments", 0);