From patchwork Thu Dec 19 10:55:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksa Sarai X-Patchwork-Id: 11303275 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 81DC91580 for ; Thu, 19 Dec 2019 10:56:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5F4FC24676 for ; Thu, 19 Dec 2019 10:56:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726928AbfLSK4x (ORCPT ); Thu, 19 Dec 2019 05:56:53 -0500 Received: from mout-p-202.mailbox.org ([80.241.56.172]:29784 "EHLO mout-p-202.mailbox.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726702AbfLSK4x (ORCPT ); Thu, 19 Dec 2019 05:56:53 -0500 Received: from smtp1.mailbox.org (smtp1.mailbox.org [IPv6:2001:67c:2050:105:465:1:1:0]) (using TLSv1.2 with cipher ECDHE-RSA-CHACHA20-POLY1305 (256/256 bits)) (No client certificate requested) by mout-p-202.mailbox.org (Postfix) with ESMTPS id 47dpjG2rbczQlDD; Thu, 19 Dec 2019 11:56:50 +0100 (CET) X-Virus-Scanned: amavisd-new at heinlein-support.de Received: from smtp1.mailbox.org ([80.241.60.240]) by spamfilter02.heinlein-hosting.de (spamfilter02.heinlein-hosting.de [80.241.56.116]) (amavisd-new, port 10030) with ESMTP id 7vreqxoenpiV; Thu, 19 Dec 2019 11:56:45 +0100 (CET) From: Aleksa Sarai To: Alexander Viro , Jeff Layton , "J. Bruce Fields" , Shuah Khan Cc: Aleksa Sarai , Florian Weimer , David Laight , Christian Brauner , dev@opencontainers.org, containers@lists.linux-foundation.org, libc-alpha@sourceware.org, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH 1/2] uapi: split openat2(2) definitions from fcntl.h Date: Thu, 19 Dec 2019 21:55:32 +1100 Message-Id: <20191219105533.12508-5-cyphar@cyphar.com> In-Reply-To: <20191219105533.12508-1-cyphar@cyphar.com> References: <20191219105533.12508-1-cyphar@cyphar.com> MIME-Version: 1.0 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Florian mentioned that glibc doesn't use fcntl.h because it has some issues with namespace cleanliness, and that we should have a separate header for openat2(2) if possible. Suggested-by: Florian Weimer Signed-off-by: Aleksa Sarai --- MAINTAINERS | 1 + include/uapi/linux/fcntl.h | 37 +------------------------------- include/uapi/linux/openat2.h | 41 ++++++++++++++++++++++++++++++++++++ 3 files changed, 43 insertions(+), 36 deletions(-) create mode 100644 include/uapi/linux/openat2.h diff --git a/MAINTAINERS b/MAINTAINERS index bd5847e802de..737ada377ac3 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6397,6 +6397,7 @@ F: fs/* F: include/linux/fs.h F: include/linux/fs_types.h F: include/uapi/linux/fs.h +F: include/uapi/linux/openat2.h FINTEK F75375S HARDWARE MONITOR AND FAN CONTROLLER DRIVER M: Riku Voipio diff --git a/include/uapi/linux/fcntl.h b/include/uapi/linux/fcntl.h index d886bdb585e4..ca88b7bce553 100644 --- a/include/uapi/linux/fcntl.h +++ b/include/uapi/linux/fcntl.h @@ -3,6 +3,7 @@ #define _UAPI_LINUX_FCNTL_H #include +#include #define F_SETLEASE (F_LINUX_SPECIFIC_BASE + 0) #define F_GETLEASE (F_LINUX_SPECIFIC_BASE + 1) @@ -100,40 +101,4 @@ #define AT_RECURSIVE 0x8000 /* Apply to the entire subtree */ -/* - * Arguments for how openat2(2) should open the target path. If @resolve is - * zero, then openat2(2) operates very similarly to openat(2). - * - * However, unlike openat(2), unknown bits in @flags result in -EINVAL rather - * than being silently ignored. @mode must be zero unless one of {O_CREAT, - * O_TMPFILE} are set. - * - * @flags: O_* flags. - * @mode: O_CREAT/O_TMPFILE file mode. - * @resolve: RESOLVE_* flags. - */ -struct open_how { - __aligned_u64 flags; - __u16 mode; - __u16 __padding[3]; /* must be zeroed */ - __aligned_u64 resolve; -}; - -#define OPEN_HOW_SIZE_VER0 24 /* sizeof first published struct */ -#define OPEN_HOW_SIZE_LATEST OPEN_HOW_SIZE_VER0 - -/* how->resolve flags for openat2(2). */ -#define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings - (includes bind-mounts). */ -#define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style - "magic-links". */ -#define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks - (implies OEXT_NO_MAGICLINKS) */ -#define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like - "..", symlinks, and absolute - paths which escape the dirfd. */ -#define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".." - be scoped inside the dirfd - (similar to chroot(2)). */ - #endif /* _UAPI_LINUX_FCNTL_H */ diff --git a/include/uapi/linux/openat2.h b/include/uapi/linux/openat2.h new file mode 100644 index 000000000000..19ef775e8e5e --- /dev/null +++ b/include/uapi/linux/openat2.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI_LINUX_OPENAT2_H +#define _UAPI_LINUX_OPENAT2_H + +/* + * Arguments for how openat2(2) should open the target path. If @resolve is + * zero, then openat2(2) operates very similarly to openat(2). + * + * However, unlike openat(2), unknown bits in @flags result in -EINVAL rather + * than being silently ignored. @mode must be zero unless one of {O_CREAT, + * O_TMPFILE} are set. + * + * @flags: O_* flags. + * @mode: O_CREAT/O_TMPFILE file mode. + * @resolve: RESOLVE_* flags. + */ +struct open_how { + __aligned_u64 flags; + __u16 mode; + __u16 __padding[3]; /* must be zeroed */ + __aligned_u64 resolve; +}; + +#define OPEN_HOW_SIZE_VER0 24 /* sizeof first published struct */ +#define OPEN_HOW_SIZE_LATEST OPEN_HOW_SIZE_VER0 + +/* how->resolve flags for openat2(2). */ +#define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings + (includes bind-mounts). */ +#define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style + "magic-links". */ +#define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks + (implies OEXT_NO_MAGICLINKS) */ +#define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like + "..", symlinks, and absolute + paths which escape the dirfd. */ +#define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".." + be scoped inside the dirfd + (similar to chroot(2)). */ + +#endif /* _UAPI_LINUX_OPENAT2_H */