ovl_ensure_verity_loaded(): constify datapath argument

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Author: Al Viro

fs/overlayfs/overlayfs.h

@@ -563,7 +563,7 @@ int ovl_set_metacopy_xattr(struct ovl_fs *ofs, struct dentry *d,
 			   struct ovl_metacopy *metacopy);
 bool ovl_is_metacopy_dentry(struct dentry *dentry);
 char *ovl_get_redirect_xattr(struct ovl_fs *ofs, const struct path *path, int padding);
-int ovl_ensure_verity_loaded(struct path *path);
+int ovl_ensure_verity_loaded(const struct path *path);
 int ovl_validate_verity(struct ovl_fs *ofs,
 			struct path *metapath,
 			struct path *datapath);

fs/overlayfs/util.c

@@ -1381,7 +1381,7 @@ char *ovl_get_redirect_xattr(struct ovl_fs *ofs, const struct path *path, int pa
 }
 
 /* Call with mounter creds as it may open the file */
-int ovl_ensure_verity_loaded(struct path *datapath)
+int ovl_ensure_verity_loaded(const struct path *datapath)
 {
 	struct inode *inode = d_inode(datapath->dentry);
 	struct file *filp;