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authorStanislav Kinsburskiy <skinsbursky@virtuozzo.com>2015-12-15 18:41:31 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2016-01-09 10:55:37 +0300
commit0dbf5f20652108106cb822ad7662c786baaa03ff (patch)
treeb49fa7310ed588939e67ce97ed39fd9682da59e0
parent90330e689c32e5105265c461c54af6ecec3373fa (diff)
downloadlinux-0dbf5f20652108106cb822ad7662c786baaa03ff.tar.xz
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>
-rw-r--r--fs/fcntl.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c
index ee85cd4e136a..350a2c8cfd28 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 (!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;