diff options
| author | Dylan Yudaken <dylany@meta.com> | 2023-01-27 05:52:25 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-01-29 15:18:26 -0700 |
| commit | aebb224fd4fc7352cd839ad90414c548387142fd (patch) | |
| tree | 8f209de8d9e8eec51774f27764dd5229d0a2d463 /io_uring/splice.c | |
| parent | 6bb30855560e6343e7b88595d7c3159d0f848a04 (diff) | |
| download | lwn-aebb224fd4fc7352cd839ad90414c548387142fd.tar.gz lwn-aebb224fd4fc7352cd839ad90414c548387142fd.zip | |
io_uring: for requests that require async, force it
Some requests require being run async as they do not support
non-blocking. Instead of trying to issue these requests, getting -EAGAIN
and then queueing them for async issue, rather just force async upfront.
Add WARN_ON_ONCE to make sure surprising code paths do not come up,
however in those cases the bug would end up being a blocking
io_uring_enter(2) which should not be critical.
Signed-off-by: Dylan Yudaken <dylany@meta.com>
Link: https://lore.kernel.org/r/20230127135227.3646353-3-dylany@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/splice.c')
| -rw-r--r-- | io_uring/splice.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/io_uring/splice.c b/io_uring/splice.c index 53e4232d0866..2a4bbb719531 100644 --- a/io_uring/splice.c +++ b/io_uring/splice.c @@ -34,6 +34,7 @@ static int __io_splice_prep(struct io_kiocb *req, if (unlikely(sp->flags & ~valid_flags)) return -EINVAL; sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in); + req->flags |= REQ_F_FORCE_ASYNC; return 0; } @@ -52,8 +53,7 @@ int io_tee(struct io_kiocb *req, unsigned int issue_flags) struct file *in; long ret = 0; - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; + WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); if (sp->flags & SPLICE_F_FD_IN_FIXED) in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags); @@ -94,8 +94,7 @@ int io_splice(struct io_kiocb *req, unsigned int issue_flags) struct file *in; long ret = 0; - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; + WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); if (sp->flags & SPLICE_F_FD_IN_FIXED) in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags); |