Commit 0dbf5f20 authored Dec 15, 2015 by Stanislav Kinsburskiy Committed by Al Viro Jan 09, 2016

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 sanity checks.
Ability to set this flag will be used by CRIU to migrate packetized pipes.

v2:
Fixed typos and mode variable to check.

Signed-off-by: Stanislav Kinsburskiy <skinsbursky@virtuozzo.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

parent 90330e68

fs/fcntl.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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 (!S_ISFIFO(filp->f_inode->i_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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