linux-kernel - [PATCH 5.17 0102/1126] io_uring: ensure that fsnotify is always called

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Date:   Tue,  5 Apr 2022 09:14:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.17 0102/1126] io_uring: ensure that fsnotify is always called

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

commit f63cf5192fe3418ad5ae1a4412eba5694b145f79 upstream.

Ensure that we call fsnotify_modify() if we write a file, and that we
do fsnotify_access() if we read it. This enables anyone using inotify
on the file to get notified.

Ditto for fallocate, ensure that fsnotify_modify() is called.

Cc: stable@...r.kernel.org
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/io_uring.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2813,8 +2813,12 @@ static bool io_rw_should_reissue(struct
 
 static bool __io_complete_rw_common(struct io_kiocb *req, long res)
 {
-	if (req->rw.kiocb.ki_flags & IOCB_WRITE)
+	if (req->rw.kiocb.ki_flags & IOCB_WRITE) {
 		kiocb_end_write(req);
+		fsnotify_modify(req->file);
+	} else {
+		fsnotify_access(req->file);
+	}
 	if (unlikely(res != req->result)) {
 		if ((res == -EAGAIN || res == -EOPNOTSUPP) &&
 		    io_rw_should_reissue(req)) {
@@ -4301,6 +4305,8 @@ static int io_fallocate(struct io_kiocb
 				req->sync.len);
 	if (ret < 0)
 		req_set_fail(req);
+	else
+		fsnotify_modify(req->file);
 	io_req_complete(req, ret);
 	return 0;
 }