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Jori KoolstraandChristian Brauner
0da79c259a
A recent build failure[1] exposed the diffculty of working with the
current octal and hex definitions of O_ flags when trying to find a gap
for a new flag. This difficulty is compounded by the fact that O_ flags
may have architectural specific values.
Replace the hex/octal #defines, which are hard to parse when looking for
free bits, with explicit bit shifts like (1 << 11). Also, add comments
that identify which architectures redefine some of the seemingly free
("cursed") bits in uapi/asm-generic/fcntl.h. These should not be used to
define new O_ flags (for now, at least).
The translastion was done with Claude Opus 4.8, and verified with a
(non-AI) gawk script. The accounting of which architectures claim
which bit-gaps in uapi/asm-generic/fcntl.h is also done by hand.
[1]: https://lore.kernel.org/all/agruPPybCx8q2XcJ@sirena.org.uk/
Assisted-by: Claude:Opus 4.8
Signed-off-by: Jori Koolstra <jkoolstra@xs4all.nl>
Link: https://patch.msgid.link/20260604222405.5382-1-jkoolstra@xs4all.nl
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995, 96, 97, 98, 99, 2003, 05 Ralf Baechle
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*/
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#ifndef _UAPI_ASM_FCNTL_H
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#define _UAPI_ASM_FCNTL_H
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#include <asm/sgidefs.h>
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#define O_APPEND (1 << 3)
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#define O_DSYNC (1 << 4) /* used to be O_SYNC, see below */
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#define O_NONBLOCK (1 << 7)
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#define O_CREAT (1 << 8) /* not fcntl */
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#define O_TRUNC (1 << 9) /* not fcntl */
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#define O_EXCL (1 << 10) /* not fcntl */
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#define O_NOCTTY (1 << 11) /* not fcntl */
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#define FASYNC (1 << 12) /* fcntl, for BSD compatibility */
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#define O_LARGEFILE (1 << 13) /* allow large file opens */
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/*
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* Before Linux 2.6.33 only O_DSYNC semantics were implemented, but using
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* the O_SYNC flag. We continue to use the existing numerical value
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* for O_DSYNC semantics now, but using the correct symbolic name for it.
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* This new value is used to request true Posix O_SYNC semantics. It is
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* defined in this strange way to make sure applications compiled against
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* new headers get at least O_DSYNC semantics on older kernels.
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*
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* This has the nice side-effect that we can simply test for O_DSYNC
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* wherever we do not care if O_DSYNC or O_SYNC is used.
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*
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* Note: __O_SYNC must never be used directly.
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*/
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#define __O_SYNC (1 << 14)
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#define O_SYNC (__O_SYNC|O_DSYNC)
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#define O_DIRECT (1 << 15) /* direct disk access hint */
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#define F_GETLK 14
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#define F_SETLK 6
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#define F_SETLKW 7
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#define F_SETOWN 24 /* for sockets. */
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#define F_GETOWN 23 /* for sockets. */
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#if __BITS_PER_LONG == 32 || defined(__KERNEL__)
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#define F_GETLK64 33 /* using 'struct flock64' */
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#define F_SETLK64 34
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#define F_SETLKW64 35
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#endif /* __BITS_PER_LONG == 32 || defined(__KERNEL__) */
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#if _MIPS_SIM != _MIPS_SIM_ABI64
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#define __ARCH_FLOCK_EXTRA_SYSID long l_sysid;
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#define __ARCH_FLOCK_PAD long pad[4];
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#endif
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#include <asm-generic/fcntl.h>
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#endif /* _UAPI_ASM_FCNTL_H */
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