linux-kernel - [PATCH 5.8 04/70] io_uring: move dropping of files into separate helper

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Date:   Sat, 31 Oct 2020 12:35:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pavel Begunkov <asml.silence@...il.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.8 04/70] io_uring: move dropping of files into separate helper

From: Jens Axboe <axboe@...nel.dk>

commit f573d384456b3025d3f8e58b3eafaeeb0f510784 upstream.

No functional changes in this patch, prep patch for grabbing references
to the files_struct.

Reviewed-by: Pavel Begunkov <asml.silence@...il.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/io_uring.c |   26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1424,6 +1424,20 @@ static inline void io_put_file(struct io
 		fput(file);
 }
 
+static void io_req_drop_files(struct io_kiocb *req)
+{
+	struct io_ring_ctx *ctx = req->ctx;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ctx->inflight_lock, flags);
+	list_del(&req->inflight_entry);
+	if (waitqueue_active(&ctx->inflight_wait))
+		wake_up(&ctx->inflight_wait);
+	spin_unlock_irqrestore(&ctx->inflight_lock, flags);
+	req->flags &= ~REQ_F_INFLIGHT;
+	req->work.files = NULL;
+}
+
 static void __io_req_aux_free(struct io_kiocb *req)
 {
 	if (req->flags & REQ_F_NEED_CLEANUP)
@@ -1440,16 +1454,8 @@ static void __io_free_req(struct io_kioc
 {
 	__io_req_aux_free(req);
 
-	if (req->flags & REQ_F_INFLIGHT) {
-		struct io_ring_ctx *ctx = req->ctx;
-		unsigned long flags;
-
-		spin_lock_irqsave(&ctx->inflight_lock, flags);
-		list_del(&req->inflight_entry);
-		if (waitqueue_active(&ctx->inflight_wait))
-			wake_up(&ctx->inflight_wait);
-		spin_unlock_irqrestore(&ctx->inflight_lock, flags);
-	}
+	if (req->flags & REQ_F_INFLIGHT)
+		io_req_drop_files(req);
 
 	percpu_ref_put(&req->ctx->refs);
 	if (likely(!io_is_fallback_req(req)))