diff options
| author | Jens Axboe <axboe@kernel.dk> | 2024-09-10 08:30:57 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-12-27 13:53:02 +0100 |
| commit | 57cd0416d4967ec87baa68f5a54bbe6c90fe7526 (patch) | |
| tree | 19df79e34cfb17f584fb9f84eb2dcd6277262df8 | |
| parent | 72060434a14caea20925e492310d6e680e3f9007 (diff) | |
io_uring/rw: treat -EOPNOTSUPP for IOCB_NOWAIT like -EAGAIN
Commit c0a9d496e0fece67db777bd48550376cf2960c47 upstream.
Some file systems, ocfs2 in this case, will return -EOPNOTSUPP for
an IOCB_NOWAIT read/write attempt. While this can be argued to be
correct, the usual return value for something that requires blocking
issue is -EAGAIN.
A refactoring io_uring commit dropped calling kiocb_done() for
negative return values, which is otherwise where we already do that
transformation. To ensure we catch it in both spots, check it in
__io_read() itself as well.
Reported-by: Robert Sander <r.sander@heinlein-support.de>
Link: https://fosstodon.org/@gurubert@mastodon.gurubert.de/113112431889638440
Cc: stable@vger.kernel.org
Fixes: a08d195b586a ("io_uring/rw: split io_read() into a helper")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | io_uring/rw.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/io_uring/rw.c b/io_uring/rw.c index d54f26db0135..b32395d872c6 100644 --- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -757,6 +757,14 @@ static int __io_read(struct io_kiocb *req, unsigned int issue_flags) ret = io_iter_do_read(rw, &s->iter); + /* + * Some file systems like to return -EOPNOTSUPP for an IOCB_NOWAIT + * issue, even though they should be returning -EAGAIN. To be safe, + * retry from blocking context for either. + */ + if (ret == -EOPNOTSUPP && force_nonblock) + ret = -EAGAIN; + if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { req->flags &= ~REQ_F_REISSUE; /* if we can poll, just do that */ |