From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Pavel Begunkov <asml.silence@gmail.com>,
Jens Axboe <axboe@kernel.dk>, Sasha Levin <sashal@kernel.org>,
linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org
Subject: [PATCH AUTOSEL 5.7 258/274] io_uring: fix overflowed reqs cancellation
Date: Mon, 8 Jun 2020 19:05:51 -0400 [thread overview]
Message-ID: <20200608230607.3361041-258-sashal@kernel.org> (raw)
In-Reply-To: <20200608230607.3361041-1-sashal@kernel.org>
From: Pavel Begunkov <asml.silence@gmail.com>
[ Upstream commit 7b53d59859bc932b37895d2d37388e7fa29af7a5 ]
Overflowed requests in io_uring_cancel_files() should be shed only of
inflight and overflowed refs. All other left references are owned by
someone else.
If refcount_sub_and_test() fails, it will go further and put put extra
ref, don't do that. Also, don't need to do io_wq_cancel_work()
for overflowed reqs, they will be let go shortly anyway.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/io_uring.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index dd90c3fcd4f5..4038ed0a5c39 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -7467,10 +7467,11 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx,
finish_wait(&ctx->inflight_wait, &wait);
continue;
}
+ } else {
+ io_wq_cancel_work(ctx->io_wq, &cancel_req->work);
+ io_put_req(cancel_req);
}
- io_wq_cancel_work(ctx->io_wq, &cancel_req->work);
- io_put_req(cancel_req);
schedule();
finish_wait(&ctx->inflight_wait, &wait);
}
--
2.25.1
prev parent reply other threads:[~2020-06-09 0:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200608230607.3361041-1-sashal@kernel.org>
2020-06-08 23:02 ` [PATCH AUTOSEL 5.7 052/274] io_uring: cleanup io_poll_remove_one() logic Sasha Levin
2020-06-08 23:04 ` [PATCH AUTOSEL 5.7 206/274] io_uring: allow POLL_ADD with double poll_wait() users Sasha Levin
2020-06-08 23:05 ` Sasha Levin [this message]
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