linux-kernel - [PATCH] Allow O_SYNC to be set by fcntl(F

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Date:	Fri, 25 Feb 2011 16:52:36 -0500
From:	Steve Rago <sar@...-labs.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] Allow O_SYNC to be set by fcntl(F_SETFL)

This has probably been a problem since day 1 (I ran into this running the 2.4 kernel years ago; finally got around to 
fixing it).  The problem is that fcntl(fd, F_SETFL, flags|O_SYNC) appears to work, but silently ignores the O_SYNC flag. 
  Opening the file with O_SYNC works okay, but setting it later on via fcntl doesn't work.


Signed-off-by: Steve Rago <sar@...-labs.com>
---
  fs/fcntl.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/fcntl.c b/fs/fcntl.c
index cb10261..afd233a 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -143,7 +143,7 @@ SYSCALL_DEFINE1(dup, unsigned int, fildes)
         return ret;
  }

-#define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME)
+#define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME | O_SYNC)

  static int setfl(int fd, struct file * filp, unsigned long arg)
  {
--
1.7.2.1

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