[PATCH] tun: honor IOCB_NOWAIT flag

[Jens Axboe]

tun only checks the file O_NONBLOCK flag, but it should also be checking
the iocb IOCB_NOWAIT flag. Any fops using ->read/write_iter() should check
both, otherwise it breaks users that correctly expect O_NONBLOCK semantics
if IOCB_NOWAIT is set.

Cc: sta...@vger.kernel.org
Signed-off-by: Jens Axboe <ax...@kernel.dk>

---

Had a bug report on io_uring, and it's due to tun not honoring
IOCB_NOWAIT. Let's get this fixed.

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index be69d272052f..cd06cae76035 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1961,12 +1961,15 @@ static ssize_t tun_chr_write_iter(struct kiocb *iocb, 
struct iov_iter *from)
        struct tun_file *tfile = file->private_data;
        struct tun_struct *tun = tun_get(tfile);
        ssize_t result;
+       int noblock = 0;
 
        if (!tun)
                return -EBADFD;
 
-       result = tun_get_user(tun, tfile, NULL, from,
-                             file->f_flags & O_NONBLOCK, false);
+       if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT))
+               noblock = 1;
+
+       result = tun_get_user(tun, tfile, NULL, from, noblock, false);
 
        tun_put(tun);
        return result;
@@ -2185,10 +2188,15 @@ static ssize_t tun_chr_read_iter(struct kiocb *iocb, 
struct iov_iter *to)
        struct tun_file *tfile = file->private_data;
        struct tun_struct *tun = tun_get(tfile);
        ssize_t len = iov_iter_count(to), ret;
+       int noblock = 0;
 
        if (!tun)
                return -EBADFD;
-       ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK, NULL);
+
+       if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT))
+               noblock = 1;
+
+       ret = tun_do_read(tun, tfile, to, noblock, NULL);
        ret = min_t(ssize_t, ret, len);
        if (ret > 0)
                iocb->ki_pos = ret;

-- 
Jens Axboe