linux-kernel - [PATCH 4/5] io_uring: add missing io_req

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Message-Id: <0a34342f63cd7a535cc54e5e1fe3ab73907a7da9.1581450491.git.asml.silence@gmail.com>
Date:   Tue, 11 Feb 2020 23:01:57 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] io_uring: add missing io_req_cancelled()

fallocate_finish() is missing cancellation check. Add it.
It's safe to do that, as only flags setup and sqe fields copy are done
before it gets into __io_fallocate().

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 fs/io_uring.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index f3108bce4afe..b33f2521040e 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2529,6 +2529,8 @@ static void io_fallocate_finish(struct io_wq_work **workptr)
 	struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
 	struct io_kiocb *nxt = NULL;
 
+	if (io_req_cancelled(req))
+		return;
 	__io_fallocate(req, &nxt);
 	if (nxt)
 		io_wq_assign_next(workptr, nxt);
@@ -2905,6 +2907,7 @@ static void io_close_finish(struct io_wq_work **workptr)
 	struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
 	struct io_kiocb *nxt = NULL;
 
+	/* not cancellable, don't io_req_cancelled() */
 	__io_close_finish(req, &nxt);
 	if (nxt)
 		io_wq_assign_next(workptr, nxt);
-- 
2.24.0