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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Pavel Begunkov <asml.silence@gmail.com>,
        Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 5.10 19/63] io_uring: add a helper for setting a ref node
Date:   Mon,  4 Jan 2021 16:57:12 +0100
Message-Id: <20210104155709.749086373@linuxfoundation.org>
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From: Pavel Begunkov <asml.silence@gmail.com>

commit 1642b4450d20e31439c80c28256c8eee08684698 upstream.

Setting a new reference node to a file data is not trivial, don't repeat
it, add and use a helper.

Cc: stable@vger.kernel.org # 5.6+
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/io_uring.c |   22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6991,6 +6991,16 @@ static void io_file_ref_kill(struct perc
 	complete(&data->done);
 }
 
+static void io_sqe_files_set_node(struct fixed_file_data *file_data,
+				  struct fixed_file_ref_node *ref_node)
+{
+	spin_lock_bh(&file_data->lock);
+	file_data->node = ref_node;
+	list_add_tail(&ref_node->node, &file_data->ref_list);
+	spin_unlock_bh(&file_data->lock);
+	percpu_ref_get(&file_data->refs);
+}
+
 static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
 {
 	struct fixed_file_data *data = ctx->file_data;
@@ -7519,11 +7529,7 @@ static int io_sqe_files_register(struct
 		return PTR_ERR(ref_node);
 	}
 
-	file_data->node = ref_node;
-	spin_lock_bh(&file_data->lock);
-	list_add_tail(&ref_node->node, &file_data->ref_list);
-	spin_unlock_bh(&file_data->lock);
-	percpu_ref_get(&file_data->refs);
+	io_sqe_files_set_node(file_data, ref_node);
 	return ret;
 out_fput:
 	for (i = 0; i < ctx->nr_user_files; i++) {
@@ -7679,11 +7685,7 @@ static int __io_sqe_files_update(struct
 
 	if (needs_switch) {
 		percpu_ref_kill(&data->node->refs);
-		spin_lock_bh(&data->lock);
-		list_add_tail(&ref_node->node, &data->ref_list);
-		data->node = ref_node;
-		spin_unlock_bh(&data->lock);
-		percpu_ref_get(&ctx->file_data->refs);
+		io_sqe_files_set_node(data, ref_node);
 	} else
 		destroy_fixed_file_ref_node(ref_node);