linux-kernel - Re: [PATCH v2] UAPI: move RENAME_* definitions to separated file

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Date:   Wed, 14 Nov 2018 07:26:07 +0000
From:   Yury Norov <ynorov@...iumnetworks.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Florian Weimer <fweimer@...hat.com>
CC:     "Norov, Yuri" <Yuri.Norov@...ium.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "libc-alpha@...rceware.org" <libc-alpha@...rceware.org>
Subject: Re: [PATCH v2] UAPI: move RENAME_* definitions to separated file

Hi all, 

It seems that I forgot to rename guards in v2. This is the correct
version. My apologize for noise.

Yury

>From 61215b1cb559e69fb57f2a82864e72e3a1ef4b12 Mon Sep 17 00:00:00 2001
From: Yury Norov <ynorov@...iumnetworks.com>
Date: Wed, 14 Nov 2018 09:51:49 +0300
To: Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Florian Weimer <fweimer@...hat.com>
CC: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-api@...r.kernel.org, libc-alpha@...rceware.org
Subject: [PATCH v2] UAPI: move RENAME_* definitions to separated file

Discussion:
https://lore.kernel.org/lkml/20180702084622.GA15274@yury-thinkpad/

Although RENAME_* macros are exposed in kernel headers, they are not
used by glibc. That's because linux/fs.h which hosts RENAME_* is
considered unsuitable by glibc developers:

As Florian Weimer wrote:

> <linux/fs.h> undefines and defines macros not mentioned in the standards
> (and it even contains a few unrelated structs), so we cannot include it
> without _GNU_SOURCE.
>
> It might be possible to include it only for _GNU_SOURCE, but there are a
> lot of things in <linux/fs.h>, so that does not seem to be particularly
> advisable.

In this patch RENAME_* is removed to a separated header file that
conforms the standards and therefore is suitable for inclusion by glibc.

v2:
 - rename dedicated file to 'rename-flags.h', as requested by Florian.

Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
---
 include/uapi/linux/fs.h           |  4 +---
 include/uapi/linux/rename-flags.h | 12 ++++++++++++
 2 files changed, 13 insertions(+), 3 deletions(-)
 create mode 100644 include/uapi/linux/rename-flags.h

diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 73e01918f996..34c308203746 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -39,9 +39,7 @@
 #define SEEK_HOLE	4	/* seek to the next hole */
 #define SEEK_MAX	SEEK_HOLE
 
-#define RENAME_NOREPLACE	(1 << 0)	/* Don't overwrite target */
-#define RENAME_EXCHANGE		(1 << 1)	/* Exchange source and dest */
-#define RENAME_WHITEOUT		(1 << 2)	/* Whiteout source */
+#include <linux/rename-flags.h>
 
 struct file_clone_range {
 	__s64 src_fd;
diff --git a/include/uapi/linux/rename-flags.h b/include/uapi/linux/rename-flags.h
new file mode 100644
index 000000000000..7178f0565657
--- /dev/null
+++ b/include/uapi/linux/rename-flags.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_LINUX_RENAME_FLAGS_H
+#define _UAPI_LINUX_RENAME_FLAGS_H
+
+/*
+ * Definitions for rename syscall family.
+ */
+#define RENAME_NOREPLACE	(1 << 0)	/* Don't overwrite target */
+#define RENAME_EXCHANGE		(1 << 1)	/* Exchange source and dest */
+#define RENAME_WHITEOUT		(1 << 2)	/* Whiteout source */
+
+#endif /* _UAPI_LINUX_RENAME_FLAGS_H */
-- 
2.17.1