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

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Message-ID: <20181122121642.GB17424@yury-thinkpad>
Date:   Thu, 22 Nov 2018 12:16:54 +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

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On Wed, Nov 14, 2018 at 07:26:07AM +0000, Yury Norov wrote:
> 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