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

Greg Kroah-Hartman
2022-04-05T07:48:32Z

From: Jens Axboe <axboe@kernel.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@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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;
}