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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH v2 04/13] io_uring: refactor io_read for unsupported nowait
Date: Thu,  4 Feb 2021 13:51:59 +0000	[thread overview]
Message-ID: <08a95dbcc8a60003e8b8900e194d3ec4fb59188e.1612446019.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

!io_file_supports_async() case of io_read() is hard to read, it jumps
somewhere in the middle of the function just to do async setup and fail
on a similar check. Call io_setup_async_rw() directly for this case,
it's much easier to follow.

Signed-off-by: Pavel Begunkov <[email protected]>
---
 fs/io_uring.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index dcb9e937daa3..866e0ea83dbe 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3506,7 +3506,6 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
 	struct iov_iter __iter, *iter = &__iter;
 	struct io_async_rw *rw = req->async_data;
 	ssize_t io_size, ret, ret2;
-	bool no_async;
 
 	if (rw) {
 		iter = &rw->iter;
@@ -3527,9 +3526,12 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
 		kiocb->ki_flags |= IOCB_NOWAIT;
 
 	/* If the file doesn't support async, just async punt */
-	no_async = force_nonblock && !io_file_supports_async(req->file, READ);
-	if (no_async)
-		goto copy_iov;
+	if (force_nonblock && !io_file_supports_async(req->file, READ)) {
+		ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
+		if (!ret)
+			return -EAGAIN;
+		goto out_free;
+	}
 
 	ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size);
 	if (unlikely(ret))
@@ -3568,8 +3570,6 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
 		ret = ret2;
 		goto out_free;
 	}
-	if (no_async)
-		return -EAGAIN;
 	rw = req->async_data;
 	/* it's copied and will be cleaned with ->io */
 	iovec = NULL;
-- 
2.24.0


  parent reply	other threads:[~2021-02-04 13:59 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-04 13:51 [PATCH v2 5.12 00/13] a second pack of 5.12 cleanups Pavel Begunkov
2021-02-04 13:51 ` [PATCH v2 01/13] io_uring: deduplicate core cancellations sequence Pavel Begunkov
2021-02-04 13:51 ` [PATCH v2 02/13] io_uring: refactor scheduling in io_cqring_wait Pavel Begunkov
2021-02-04 13:51 ` [PATCH v2 03/13] io_uring: refactor io_cqring_wait Pavel Begunkov
2021-02-04 13:51 ` Pavel Begunkov [this message]
2021-02-04 13:52 ` [PATCH v2 05/13] io_uring: further simplify do_read error parsing Pavel Begunkov
2021-02-04 13:52 ` [PATCH v2 06/13] io_uring: let io_setup_async_rw take care of iovec Pavel Begunkov
2021-02-04 13:52 ` [PATCH v2 07/13] io_uring: don't forget to adjust io_size Pavel Begunkov
2021-02-04 13:52 ` [PATCH v2 08/13] io_uring: inline io_read()'s iovec freeing Pavel Begunkov
2021-02-04 13:52 ` [PATCH v2 09/13] io_uring: highlight read-retry loop Pavel Begunkov
2021-02-04 13:52 ` [PATCH v2 10/13] io_uring: treat NONBLOCK and RWF_NOWAIT similarly Pavel Begunkov
2021-02-04 13:52 ` [PATCH v2 11/13] io_uring: io_import_iovec return type cleanup Pavel Begunkov
2021-02-04 13:52 ` [PATCH v2 12/13] io_uring: deduplicate file table slot calculation Pavel Begunkov
2021-02-04 13:52 ` [PATCH v2 13/13] io_uring/io-wq: return 2-step work swap scheme Pavel Begunkov
2021-02-04 14:52   ` Jens Axboe
2021-02-04 14:56     ` Pavel Begunkov
2021-02-04 15:05       ` Jens Axboe
2021-02-04 15:07 ` [PATCH v2 5.12 00/13] a second pack of 5.12 cleanups Jens Axboe

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