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io_uring: disable io-wq execution of multishot NOWAIT requests

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Do the same check for direct io-wq execution for multishot requests that
commit 2a975d426c did for the inline execution, and disable multishot
mode (and revert to single shot) if the file type doesn't support NOWAIT,
and isn't opened in O_NONBLOCK mode. For multishot to work properly, it's
a requirement that nonblocking read attempts can be done.

Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-04-01 11:30:06 -06:00
parent 2a975d426c
commit bee1d5becd
1 changed files with 9 additions and 4 deletions
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13
io_uring/io_uring.c
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@ -1982,10 +1982,15 @@ void io_wq_submit_work(struct io_wq_work *work)
err = -EBADFD;
if (!io_file_can_poll(req))
goto fail;
err = -ECANCELED;
if (io_arm_poll_handler(req, issue_flags) != IO_APOLL_OK)
goto fail;
return;
if (req->file->f_flags & O_NONBLOCK ||
req->file->f_mode & FMODE_NOWAIT) {
err = -ECANCELED;
if (io_arm_poll_handler(req, issue_flags) != IO_APOLL_OK)
goto fail;
return;
} else {
req->flags &= ~REQ_F_APOLL_MULTISHOT;
}
}
if (req->flags & REQ_F_FORCE_ASYNC) {