We need to know the rbd options for a rbd device, such as whether lock_on_read
is true or false. then this patch introduce a rbd_options to show the rbd options in sysfs.
Signed-off-by: Dongsheng Yang <dongsheng.yang@xxxxxxxxxxxx>
---
drivers/block/rbd.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 50b9d0f..d56c250 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -4205,6 +4205,26 @@ static ssize_t rbd_image_refresh(struct device *dev,
return size;
}
+static ssize_t rbd_options_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
+ unsigned long long lock_timeout =
+ jiffies_to_msecs(rbd_dev->opts->lock_timeout) / 1000;
+ ssize_t len = 0;
+
+ len = sprintf(buf, "queue_depth=%llu",
+ (unsigned long long)rbd_dev->opts->queue_depth);
+ len += sprintf(buf + len, ",lock_timeout=%llu", lock_timeout);
+ len += sprintf(buf + len, ",read_only=%s",
+ rbd_dev->opts->read_only? "true" : "false");
+ len += sprintf(buf + len, ",lock_on_read=%s",
+ rbd_dev->opts->lock_on_read? "true" : "false");
+ len += sprintf(buf + len, ",exclusive=%s\n",
+ rbd_dev->opts->exclusive? "true" : "false");
+ return len;
+}
+
static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL);
static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL);
static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL);
@@ -4221,6 +4241,7 @@ static ssize_t rbd_image_refresh(struct device *dev,
static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL);
static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL);
static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL);
+static DEVICE_ATTR(rbd_options, S_IRUGO, rbd_options_show, NULL);
static struct attribute *rbd_attrs[] = {
&dev_attr_size.attr,
@@ -4239,6 +4260,7 @@ static ssize_t rbd_image_refresh(struct device *dev,
&dev_attr_snap_id.attr,
&dev_attr_parent.attr,
&dev_attr_refresh.attr,
+ &dev_attr_rbd_options.attr,
NULL
};
--
1.8.3.1
--
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