Messages in this thread Patch in this message | | | Subject | [PATCH] fcntl: allow to set O_DIRECT flag on pipe | From | Stanislav Kinsburskiy <> | Date | Tue, 15 Dec 2015 19:14:04 +0400 |
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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@virtuozzo.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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