ovl_validate_verity(): constify {meta,data}path arguments

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

Author: Al Viro

fs/overlayfs/overlayfs.h

@@ -565,8 +565,8 @@ 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(const struct path *path);
 int ovl_validate_verity(struct ovl_fs *ofs,
-			struct path *metapath,
-			struct path *datapath);
+			const struct path *metapath,
+			const struct path *datapath);
 int ovl_get_verity_digest(struct ovl_fs *ofs, struct path *src,
 			  struct ovl_metacopy *metacopy);
 int ovl_sync_status(struct ovl_fs *ofs);

fs/overlayfs/util.c

@@ -1401,8 +1401,8 @@ int ovl_ensure_verity_loaded(const struct path *datapath)
 }
 
 int ovl_validate_verity(struct ovl_fs *ofs,
-			struct path *metapath,
-			struct path *datapath)
+			const struct path *metapath,
+			const struct path *datapath)
 {
 	struct ovl_metacopy metacopy_data;
 	u8 actual_digest[FS_VERITY_MAX_DIGEST_SIZE];