This commit reports whether a virtio-blk device
support cache flush command to user space
Signed-off-by: Zhu Lingshan <lingshan.zhu@xxxxxxxxx>
---
drivers/vdpa/vdpa.c | 14 ++++++++++++++
include/uapi/linux/vdpa.h | 1 +
2 files changed, 15 insertions(+)
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index d6fd3cadc44f..95e1440dbfaa 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -1095,6 +1095,17 @@ static int vdpa_dev_blk_ro_config_fill(struct sk_buff *msg, u64 features)
return 0;
}
+static int vdpa_dev_blk_flush_config_fill(struct sk_buff *msg, u64 features)
+{
+ u8 flush;
+
+ flush = ((features & BIT_ULL(VIRTIO_BLK_F_FLUSH)) == 0) ? 0 : 1;
+ if (nla_put_u8(msg, VDPA_ATTR_DEV_BLK_CFG_FLUSH, flush))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
struct sk_buff *msg)
{
@@ -1136,6 +1147,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
if (vdpa_dev_blk_ro_config_fill(msg, features_device))
return -EMSGSIZE;
+ if (vdpa_dev_blk_flush_config_fill(msg, features_device))
+ return -EMSGSIZE;
+
return 0;
}
diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
index 4be8e3a15874..43c51698195c 100644
--- a/include/uapi/linux/vdpa.h
+++ b/include/uapi/linux/vdpa.h
@@ -71,6 +71,7 @@ enum vdpa_attr {
VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEC, /* u32 */
VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEG, /* u32 */
VDPA_ATTR_DEV_BLK_CFG_READ_ONLY, /* u8 */
+ VDPA_ATTR_DEV_BLK_CFG_FLUSH, /* u8 */
/* new attributes must be added above here */
VDPA_ATTR_MAX,
--
2.39.3
