diff options
Diffstat (limited to 'arch/alpha/include/asm/fcntl.h')
| -rw-r--r-- | arch/alpha/include/asm/fcntl.h | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/arch/alpha/include/asm/fcntl.h b/arch/alpha/include/asm/fcntl.h index 25da0017ec87..21b1117a0c61 100644 --- a/arch/alpha/include/asm/fcntl.h +++ b/arch/alpha/include/asm/fcntl.h @@ -1,8 +1,6 @@ #ifndef _ALPHA_FCNTL_H #define _ALPHA_FCNTL_H -/* open/fcntl - O_SYNC is only implemented on blocks devices and on files - located on an ext2 file system */ #define O_CREAT 01000 /* not fcntl */ #define O_TRUNC 02000 /* not fcntl */ #define O_EXCL 04000 /* not fcntl */ @@ -10,13 +8,28 @@ #define O_NONBLOCK 00004 #define O_APPEND 00010 -#define O_SYNC 040000 +#define O_DSYNC 040000 /* used to be O_SYNC, see below */ #define O_DIRECTORY 0100000 /* must be a directory */ #define O_NOFOLLOW 0200000 /* don't follow links */ #define O_LARGEFILE 0400000 /* will be set by the kernel on every open */ #define O_DIRECT 02000000 /* direct disk access - should check with OSF/1 */ #define O_NOATIME 04000000 #define O_CLOEXEC 010000000 /* set close_on_exec */ +/* + * 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 020000000 +#define O_SYNC (__O_SYNC|O_DSYNC) #define F_GETLK 7 #define F_SETLK 8 |