diff mbox series

[v3,2/4] bdi: add new bdi_get_dev_name()

Message ID 20200323132254.47157-3-yuyufen@huawei.com (mailing list archive)
State New, archived
Headers show
Series bdi: fix use-after-free for bdi device | expand

Commit Message

Yufen Yu March 23, 2020, 1:22 p.m. UTC 
We add this new function to copy device name into buffer.
This is prepare for following patch.

Signed-off-by: Yufen Yu <yuyufen@huawei.com>
---
 include/linux/backing-dev.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
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Patch

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index f88197c1ffc2..82d2401fec37 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -19,6 +19,8 @@ 
 #include <linux/backing-dev-defs.h>
 #include <linux/slab.h>
 
+#define BDI_DEV_NAME_LEN	32
+
 static inline struct backing_dev_info *bdi_get(struct backing_dev_info *bdi)
 {
 	kref_get(&bdi->refcnt);
@@ -514,4 +516,21 @@  static inline const char *bdi_dev_name(struct backing_dev_info *bdi)
 	return dev_name(bdi->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 char *bdi_get_dev_name(struct backing_dev_info *bdi,
+			char *dname, int len)
+{
+	if (!bdi || !bdi->dev) {
+		strlcpy(dname, bdi_unknown_name, len);
+		return NULL;
+	}
+
+	strlcpy(dname, dev_name(bdi->dev), len);
+	return dname;
+}
 #endif	/* _LINUX_BACKING_DEV_H */