linux-kernel - [PATCH] fcntl: allow to set O

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Date:	Tue, 15 Dec 2015 19:14:04 +0400
From:	Stanislav Kinsburskiy <skinsbursky@...tuozzo.com>
To:	bfields@...ldses.org, jlayton@...chiereds.net,
	viro@...iv.linux.org.uk
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	devel@...u.org
Subject: [PATCH] fcntl: allow to set O_DIRECT flag on pipe

With packetized mode for pipes, it's not possible to set O_DIRECT on pipe file
via sys_fcntl, because of unsupported (by pipes) sanity checks.
Ability to set this flag will be used by CRIU to migrate packetized pipes.

Signed-off-by: Stanislav Kinsburskiy <skinsbursky@...tuozzo.com>
---
 fs/fcntl.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/fcntl.c b/fs/fcntl.c
index ee85cd4..4463a87 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -51,7 +51,8 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
 	       if (arg & O_NDELAY)
 		   arg |= O_NONBLOCK;
 
-	if (arg & O_DIRECT) {
+	/* Pipe packetized mode is controlled by O_DIRECT flag */
+	if (!IS_FIFO(f->f_mode) && (arg & O_DIRECT)) {
 		if (!filp->f_mapping || !filp->f_mapping->a_ops ||
 			!filp->f_mapping->a_ops->direct_IO)
 				return -EINVAL;

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