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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>
This commit is contained in:
Stanislav Kinsburskiy 2015-12-15 19:41:31 +04:00 committed by Al Viro
parent 90330e689c
commit 0dbf5f2065
1 changed files with 2 additions and 1 deletions
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3
fs/fcntl.c
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@ -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;