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| author | Jens Axboe <axboe@kernel.dk> | 2024-09-10 16:30:57 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-09-10 17:34:41 +0200 |
| commit | c0a9d496e0fece67db777bd48550376cf2960c47 (patch) | |
| tree | 8e28049a1c91d18299f41d35b9bc75230c76f785 /io_uring/rw.c | |
| parent | io_uring/sqpoll: do not allow pinning outside of cpuset (diff) | |
| download | linux-c0a9d496e0fece67db777bd48550376cf2960c47.tar.xz linux-c0a9d496e0fece67db777bd48550376cf2960c47.zip | |
io_uring/rw: treat -EOPNOTSUPP for IOCB_NOWAIT like -EAGAIN
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>
Diffstat (limited to 'io_uring/rw.c')
| -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 f5e0694538b9..f4d885b7c2d2 100644 --- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -855,6 +855,14 @@ static int __io_read(struct io_kiocb *req, unsigned int issue_flags) ret = io_iter_do_read(rw, &io->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. */ |