We add this new function to copy device name into buffer. This is prepare for following patch. Signed-off-by: Yufen Yu <yuyufen@xxxxxxxxxx> --- include/linux/backing-dev.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) 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 */ -- 2.17.2