mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 15:43:59 +08:00
6b2f3d1f76
While Linux provided an O_SYNC flag basically since day 1, it took until Linux 2.4.0-test12pre2 to actually get it implemented for filesystems, since that day we had generic_osync_around with only minor changes and the great "For now, when the user asks for O_SYNC, we'll actually give O_DSYNC" comment. This patch intends to actually give us real O_SYNC semantics in addition to the O_DSYNC semantics. After Jan's O_SYNC patches which are required before this patch it's actually surprisingly simple, we just need to figure out when to set the datasync flag to vfs_fsync_range and when not. This patch renames the existing O_SYNC flag to O_DSYNC while keeping it's numerical value to keep binary compatibility, and adds a new real O_SYNC flag. To guarantee backwards compatiblity it is defined as expanding to both the O_DSYNC and the new additional binary flag (__O_SYNC) to make sure we are backwards-compatible when compiled against the new headers. This also means that all places that don't care about the differences can just check O_DSYNC and get the right behaviour for O_SYNC, too - only places that actuall care need to check __O_SYNC in addition. Drivers and network filesystems have been updated in a fail safe way to always do the full sync magic if O_DSYNC is set. The few places setting O_SYNC for lower layers are kept that way for now to stay failsafe. We enforce that O_DSYNC is set when __O_SYNC is set early in the open path to make sure we always get these sane options. Note that parisc really screwed up their headers as they already define a O_DSYNC that has always been a no-op. We try to repair it by using it for the new O_DSYNC and redefinining O_SYNC to send both the traditional O_SYNC numerical value _and_ the O_DSYNC one. Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Grant Grundler <grundler@parisc-linux.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andreas Dilger <adilger@sun.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Acked-by: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jan Kara <jack@suse.cz>
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1995, 96, 97, 98, 99, 2003, 05 Ralf Baechle
|
|
*/
|
|
#ifndef _ASM_FCNTL_H
|
|
#define _ASM_FCNTL_H
|
|
|
|
|
|
#define O_APPEND 0x0008
|
|
#define O_DSYNC 0x0010 /* used to be O_SYNC, see below */
|
|
#define O_NONBLOCK 0x0080
|
|
#define O_CREAT 0x0100 /* not fcntl */
|
|
#define O_TRUNC 0x0200 /* not fcntl */
|
|
#define O_EXCL 0x0400 /* not fcntl */
|
|
#define O_NOCTTY 0x0800 /* not fcntl */
|
|
#define FASYNC 0x1000 /* fcntl, for BSD compatibility */
|
|
#define O_LARGEFILE 0x2000 /* allow large file opens */
|
|
/*
|
|
* Before Linux 2.6.32 only O_DSYNC semantics were implemented, but using
|
|
* the O_SYNC flag. We continue to use the existing numerical value
|
|
* for O_DSYNC semantics now, but using the correct symbolic name for it.
|
|
* This new value is used to request true Posix O_SYNC semantics. It is
|
|
* defined in this strange way to make sure applications compiled against
|
|
* new headers get at least O_DSYNC semantics on older kernels.
|
|
*
|
|
* This has the nice side-effect that we can simply test for O_DSYNC
|
|
* wherever we do not care if O_DSYNC or O_SYNC is used.
|
|
*
|
|
* Note: __O_SYNC must never be used directly.
|
|
*/
|
|
#define __O_SYNC 0x4000
|
|
#define O_SYNC (__O_SYNC|O_DSYNC)
|
|
#define O_DIRECT 0x8000 /* direct disk access hint */
|
|
|
|
#define F_GETLK 14
|
|
#define F_SETLK 6
|
|
#define F_SETLKW 7
|
|
|
|
#define F_SETOWN 24 /* for sockets. */
|
|
#define F_GETOWN 23 /* for sockets. */
|
|
|
|
#ifndef __mips64
|
|
#define F_GETLK64 33 /* using 'struct flock64' */
|
|
#define F_SETLK64 34
|
|
#define F_SETLKW64 35
|
|
#endif
|
|
|
|
/*
|
|
* The flavours of struct flock. "struct flock" is the ABI compliant
|
|
* variant. Finally struct flock64 is the LFS variant of struct flock. As
|
|
* a historic accident and inconsistence with the ABI definition it doesn't
|
|
* contain all the same fields as struct flock.
|
|
*/
|
|
|
|
#ifdef CONFIG_32BIT
|
|
|
|
struct flock {
|
|
short l_type;
|
|
short l_whence;
|
|
off_t l_start;
|
|
off_t l_len;
|
|
long l_sysid;
|
|
__kernel_pid_t l_pid;
|
|
long pad[4];
|
|
};
|
|
|
|
#define HAVE_ARCH_STRUCT_FLOCK
|
|
|
|
#endif /* CONFIG_32BIT */
|
|
|
|
#include <asm-generic/fcntl.h>
|
|
|
|
#endif /* _ASM_FCNTL_H */
|