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[V3,1/2] tcm_vhost: Introduce tcm_vhost_check_feature()

Message ID 1363056339-6061-2-git-send-email-asias@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Asias He March 12, 2013, 2:45 a.m. UTC 
This helper is useful to check if a feature is supported.

Signed-off-by: Asias He <asias@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 drivers/vhost/tcm_vhost.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
index c5157cd..ee6dc47 100644
--- a/drivers/vhost/tcm_vhost.c
+++ b/drivers/vhost/tcm_vhost.c
@@ -91,6 +91,18 @@  static int iov_num_pages(struct iovec *iov)
 	       ((unsigned long)iov->iov_base & PAGE_MASK)) >> PAGE_SHIFT;
 }
 
+static bool tcm_vhost_check_feature(struct vhost_scsi *vs, int feature)
+{
+	bool ret = false;
+
+	mutex_lock(&vs->dev.mutex);
+	if (vhost_has_feature(&vs->dev, feature))
+		ret = true;
+	mutex_unlock(&vs->dev.mutex);
+
+	return ret;
+}
+
 static bool tcm_vhost_check_endpoint(struct vhost_scsi *vs)
 {
 	bool ret = false;