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io_uring: mark reissue requests with REQ_F_PARTIAL_IO 

If we mark for reissue, we assume that the buffer will remain stable.
Hence if are using a provided buffer, we need to ensure that we stick
with it for the duration of that request.

This only affects block devices that use provided buffers, as those are
the only ones that get marked with REQ_F_REISSUE.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-06-20 06:39:27 -06:00
parent 6436c770f1
commit 1bacd264d3
1 changed files with 2 additions and 2 deletions
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4
fs/io_uring.c
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@ -3437,7 +3437,7 @@ static bool __io_complete_rw_common(struct io_kiocb *req, long res)
if (unlikely(res != req->cqe.res)) {
if ((res == -EAGAIN || res == -EOPNOTSUPP) &&
io_rw_should_reissue(req)) {
req->flags |= REQ_F_REISSUE;
req->flags |= REQ_F_REISSUE | REQ_F_PARTIAL_IO;
return true;
}
req_set_fail(req);
@ -3487,7 +3487,7 @@ static void io_complete_rw_iopoll(struct kiocb *kiocb, long res)
kiocb_end_write(req);
if (unlikely(res != req->cqe.res)) {
if (res == -EAGAIN && io_rw_should_reissue(req)) {
req->flags |= REQ_F_REISSUE;
req->flags |= REQ_F_REISSUE | REQ_F_PARTIAL_IO;
return;
}
req->cqe.res = res;