netdev - [PATCH 6/8] move dropping ->ki_eventfd into iocb

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Message-Id: <20190310070822.11564-6-viro@ZenIV.linux.org.uk>
Date:   Sun, 10 Mar 2019 07:08:20 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>,
        Jason Baron <jbaron@...mai.com>, kgraul@...ux.ibm.com,
        ktkhai@...tuozzo.com, kyeongdon.kim@....com,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com, xiyou.wangcong@...il.com,
        Christoph Hellwig <hch@....de>,
        zhengbin <zhengbin13@...wei.com>, bcrl@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
        houtao1@...wei.com, yi.zhang@...wei.com
Subject: [PATCH 6/8] move dropping ->ki_eventfd into iocb_destroy()

From: Al Viro <viro@...iv.linux.org.uk>

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/aio.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index f9e8f1edfe36..595c19965a8b 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1071,6 +1071,8 @@ static struct kioctx *lookup_ioctx(unsigned long ctx_id)
 
 static inline void iocb_destroy(struct aio_kiocb *iocb)
 {
+	if (iocb->ki_eventfd)
+		eventfd_ctx_put(iocb->ki_eventfd);
 	if (iocb->ki_filp)
 		fput(iocb->ki_filp);
 	percpu_ref_put(&iocb->ki_ctx->reqs);
@@ -1138,10 +1140,8 @@ static void aio_complete(struct aio_kiocb *iocb)
 	 * eventfd. The eventfd_signal() function is safe to be called
 	 * from IRQ context.
 	 */
-	if (iocb->ki_eventfd) {
+	if (iocb->ki_eventfd)
 		eventfd_signal(iocb->ki_eventfd, 1);
-		eventfd_ctx_put(iocb->ki_eventfd);
-	}
 
 	/*
 	 * We have to order our ring_info tail store above and test
@@ -1810,18 +1810,19 @@ static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb,
 		goto out_put_req;
 
 	if (iocb->aio_flags & IOCB_FLAG_RESFD) {
+		struct eventfd_ctx *eventfd;
 		/*
 		 * If the IOCB_FLAG_RESFD flag of aio_flags is set, get an
 		 * instance of the file* now. The file descriptor must be
 		 * an eventfd() fd, and will be signaled for each completed
 		 * event using the eventfd_signal() function.
 		 */
-		req->ki_eventfd = eventfd_ctx_fdget((int) iocb->aio_resfd);
-		if (IS_ERR(req->ki_eventfd)) {
-			ret = PTR_ERR(req->ki_eventfd);
-			req->ki_eventfd = NULL;
+		eventfd = eventfd_ctx_fdget((int) iocb->aio_resfd);
+		if (IS_ERR(eventfd)) {
+			ret = PTR_ERR(eventfd);
 			goto out_put_req;
 		}
+		req->ki_eventfd = eventfd;
 	}
 
 	ret = put_user(KIOCB_KEY, &user_iocb->aio_key);
@@ -1875,8 +1876,6 @@ static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb,
 		return 0;
 
 out_put_req:
-	if (req->ki_eventfd)
-		eventfd_ctx_put(req->ki_eventfd);
 	iocb_destroy(req);
 out_put_reqs_available:
 	put_reqs_available(ctx, 1);
-- 
2.11.0