linux-kernel - Question: Why is there no notification when a file is opened using filp

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Message-ID: <25817189-49a7-c64f-26ee-78d4a27496b6@huawei.com>
Date:   Tue, 8 Sep 2020 16:01:48 +0800
From:   Xiaoming Ni <nixiaoming@...wei.com>
To:     <jack@...e.cz>, <amir73il@...il.com>
CC:     <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        <wangle6@...wei.com>
Subject: Question: Why is there no notification when a file is opened using
 filp_open()?

The file opening action on the system may be from user-mode sys_open() 
or kernel-mode filp_open().
Currently, fsnotify_open() is invoked in do_sys_openat2().
But filp_open() is not notified. Why? Is this an omission?

Do we need to call fsnotify_open() in filp_open() or  do_filp_open() to 
ensure that both user-mode and kernel-mode file opening operations can 
be notified?

Thanks
Xiaoming Ni