* [PATCH 1/1] io_uring: fix short read retries for non-reg files
@ 2021-01-20 23:09 Pavel Begunkov
2021-01-20 23:50 ` Pavel Begunkov
0 siblings, 1 reply; 2+ messages in thread
From: Pavel Begunkov @ 2021-01-20 23:09 UTC (permalink / raw)
To: Jens Axboe, io-uring; +Cc: stable
Sockets and other non-regular files may actually expect short reads to
happen, don't retry reads for them.
Cc: [email protected] # 5.9+
Suggested-by: Jens Axboe <[email protected]>
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 5f6f1e48954e..544d711b2ef0 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3557,6 +3557,9 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
io_size -= ret;
copy_iov:
+ if (!(req->flags & REQ_F_ISREG) && ret > 0)
+ goto done;
+
ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
if (ret2) {
ret = ret2;
--
2.24.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH 1/1] io_uring: fix short read retries for non-reg files
2021-01-20 23:09 [PATCH 1/1] io_uring: fix short read retries for non-reg files Pavel Begunkov
@ 2021-01-20 23:50 ` Pavel Begunkov
0 siblings, 0 replies; 2+ messages in thread
From: Pavel Begunkov @ 2021-01-20 23:50 UTC (permalink / raw)
To: Jens Axboe, io-uring; +Cc: stable
On 20/01/2021 23:09, Pavel Begunkov wrote:
> Sockets and other non-regular files may actually expect short reads to
> happen, don't retry reads for them.
Works well with a quick test, but I think I may have missed a case,
please don't take it yet
>
> Cc: [email protected] # 5.9+
> Suggested-by: Jens Axboe <[email protected]>
> Signed-off-by: Pavel Begunkov <[email protected]>
> ---
> fs/io_uring.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/fs/io_uring.c b/fs/io_uring.c
> index 5f6f1e48954e..544d711b2ef0 100644
> --- a/fs/io_uring.c
> +++ b/fs/io_uring.c
> @@ -3557,6 +3557,9 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
>
> io_size -= ret;
> copy_iov:
> + if (!(req->flags & REQ_F_ISREG) && ret > 0)
> + goto done;
> +
> ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
> if (ret2) {
> ret = ret2;
>
--
Pavel Begunkov
^ permalink raw reply [flat|nested] 2+ messages in thread
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