[v6,1/3] tcm_vhost: Introduce tcm_vhost_check_feature()

Commit Message

Asias He April 13, 2013, 3:20 a.m. UTC

This helper is useful to check if a feature is supported.

Signed-off-by: Asias He <[e-mail]>
Reviewed-by: Stefan Hajnoczi <[e-mail]>
---
 drivers/vhost/tcm_vhost.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Patch

diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
index 957a0b9..88ebb79 100644
--- a/drivers/vhost/tcm_vhost.c
+++ b/drivers/vhost/tcm_vhost.c
@@ -99,6 +99,18 @@  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 int tcm_vhost_check_true(struct se_portal_group *se_tpg)
 {
 	return 1;