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| author | Stanislav Kinsburskiy <skinsbursky@virtuozzo.com> | 2015-12-15 18:41:31 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-01-09 10:55:37 +0300 |
| commit | 0dbf5f20652108106cb822ad7662c786baaa03ff (patch) | |
| tree | b49fa7310ed588939e67ce97ed39fd9682da59e0 | |
| parent | 90330e689c32e5105265c461c54af6ecec3373fa (diff) | |
| download | linux-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.c | 3 |
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; |