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io_uring/rw: ensure reissue path is correctly handled for IOPOLL 

The IOPOLL path posts CQEs when the io_kiocb is marked as completed,
so it cannot rely on the usual retry that non-IOPOLL requests do for
read/write requests.

If -EAGAIN is received and the request should be retried, go through
the normal completion path and let the normal flush logic catch it and
reissue it, like what is done for !IOPOLL reads or writes.

Fixes: d803d12394 ("io_uring/rw: handle -EAGAIN retry at IO completion time")
Reported-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/io-uring/2b43ccfa-644d-4a09-8f8f-39ad71810f41@oracle.com/
Signed-off-by: Jens Axboe <axboe@kernel.dk>
pull/1172/head
Jens Axboe 2025-03-05 14:03:34 -07:00
parent 6ebf05189d
commit bcb0fda3c2
1 changed files with 3 additions and 4 deletions
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7
io_uring/rw.c
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@ -560,11 +560,10 @@ static void io_complete_rw_iopoll(struct kiocb *kiocb, long res)
if (kiocb->ki_flags & IOCB_WRITE)
io_req_end_write(req);
if (unlikely(res != req->cqe.res)) {
if (res == -EAGAIN && io_rw_should_reissue(req)) {
if (res == -EAGAIN && io_rw_should_reissue(req))
req->flags |= REQ_F_REISSUE | REQ_F_BL_NO_RECYCLE;
return;
}
req->cqe.res = res;
else
req->cqe.res = res;
}
/* order with io_iopoll_complete() checking ->iopoll_completed */