We prepare a new function bdi_get_dev_name() to copy device
kobj->name into buffer passed by caller. The function is covered
by RCU. Thus, caller can access ->dev and copy integral device name.
Signed-off-by: Yufen Yu <yuyufen@xxxxxxxxxx>
---
include/linux/backing-dev.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 67e429b203a1..89d1cb7923f5 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -514,4 +514,29 @@ static inline const char *bdi_dev_name(struct backing_dev_info *bdi)
return dev_name(&bdi->rcu_dev->dev);
}
+/**
+ * bdi_get_dev_name - copy bdi device name into buffer
+ * @bdi: target bdi
+ * @dname: Where to copy the device name to
+ * @len: size of destination buffer
+ */
+static inline void bdi_get_dev_name(struct backing_dev_info *bdi,
+ char *dname, int len)
+{
+ struct bdi_rcu_device *rcu_dev;
+
+ if (!bdi) {
+ strlcpy(dname, bdi_unknown_name, len);
+ return;
+ }
+
+ rcu_read_lock();
+
+ rcu_dev = rcu_dereference(bdi->rcu_dev);
+ strlcpy(dname, rcu_dev ? dev_name(&rcu_dev->dev) :
+ bdi_unknown_name, len);
+
+ rcu_read_unlock();
+}
+
#endif /* _LINUX_BACKING_DEV_H */
--
2.16.2.dirty
