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

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Message-ID: <CAOQ4uxhejJzjKLZCt=b87KAX0sC3RAZ2FHEZbu4188Ar-bkmOg@mail.gmail.com>
Date:   Tue, 8 Sep 2020 13:06:53 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Xiaoming Ni <nixiaoming@...wei.com>
Cc:     Jan Kara <jack@...e.cz>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        wangle6@...wei.com
Subject: Re: Question: Why is there no notification when a file is opened
 using filp_open()?

On Tue, Sep 8, 2020 at 11:02 AM Xiaoming Ni <nixiaoming@...wei.com> wrote:
>
> 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?
>

Do you have a specific use case of kernel filp_open() in mind?

Thanks,
Amir.