1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 88a72e9c8beb..17f287decc36 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -22,6 +22,9 @@
 
 #include <linux/module.h>
 #include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/namei.h>
+#include <linux/fs.h>
 #include <asm/div64.h>
 #include "ubi.h"
 
@@ -280,6 +283,43 @@ struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
 EXPORT_SYMBOL_GPL(ubi_open_volume_nm);
 
 /**
+ * ubi_open_volume_path - open UBI volume by its character device node path.
+ * @pathname: volume character device node path
+ * @mode: open mode
+ *
+ * This function is similar to 'ubi_open_volume()', but opens a volume the path
+ * to its character device node.
+ */
+struct ubi_volume_desc *ubi_open_volume_path(const char *pathname, int mode)
+{
+        int error, ubi_num, vol_id, mod;
+        struct inode *inode;
+        struct path path;
+
+        dbg_gen("open volume %s, mode %d", pathname, mode);
+
+        if (!pathname || !*pathname)
+                return ERR_PTR(-EINVAL);
+
+        error = kern_path(pathname, LOOKUP_FOLLOW, &path);
+        if (error)
+                return ERR_PTR(error);
+
+        inode = path.dentry->d_inode;
+        mod = inode->i_mode;
+        ubi_num = ubi_major2num(imajor(inode));
+        vol_id = iminor(inode) - 1;
+        path_put(&path);
+
+        if (!S_ISCHR(mod))
+                return ERR_PTR(-EINVAL);
+        if (vol_id >= 0 && ubi_num >= 0)
+                return ubi_open_volume(ubi_num, vol_id, mode);
+        return ERR_PTR(-ENODEV);
+}
+EXPORT_SYMBOL_GPL(ubi_open_volume_path);
+
+/**
  * ubi_close_volume - close UBI volume.
  * @desc: volume descriptor
  */