diff options
| author | Jens Axboe <axboe@kernel.dk> | 2020-06-10 04:23:05 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-06-10 04:38:24 +0300 |
| commit | c5b856255cbc3b664d686a83fa9397a835e063de (patch) | |
| tree | b07a4c3d289efb1e3963741f2a986dd1ca41a002 /fs | |
| parent | f5fa38c59cb0b40633dee5cdf7465801be3e4928 (diff) | |
| download | linux-c5b856255cbc3b664d686a83fa9397a835e063de.tar.xz | |
io_uring: allow O_NONBLOCK async retry
We can assume that O_NONBLOCK is always honored, even if we don't
have a ->read/write_iter() for the file type. Also unify the read/write
checking for allowing async punt, having the write side factoring in the
REQ_F_NOWAIT flag as well.
Cc: stable@vger.kernel.org
Fixes: 490e89676a52 ("io_uring: only force async punt if poll based retry can't handle it")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/io_uring.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 3ffe03194c1e..ebea82e09963 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2061,6 +2061,10 @@ static bool io_file_supports_async(struct file *file, int rw) if (S_ISREG(mode) && file->f_op != &io_uring_fops) return true; + /* any ->read/write should understand O_NONBLOCK */ + if (file->f_flags & O_NONBLOCK) + return true; + if (!(file->f_mode & FMODE_NOWAIT)) return false; @@ -2103,8 +2107,7 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, kiocb->ki_ioprio = get_current_ioprio(); /* don't allow async punt if RWF_NOWAIT was requested */ - if ((kiocb->ki_flags & IOCB_NOWAIT) || - (req->file->f_flags & O_NONBLOCK)) + if (kiocb->ki_flags & IOCB_NOWAIT) req->flags |= REQ_F_NOWAIT; if (force_nonblock) @@ -2745,7 +2748,8 @@ copy_iov: if (ret) goto out_free; /* any defer here is final, must blocking retry */ - if (!file_can_poll(req->file)) + if (!(req->flags & REQ_F_NOWAIT) && + !file_can_poll(req->file)) req->flags |= REQ_F_MUST_PUNT; return -EAGAIN; } |