linux-kernel - Re: [LSF/MM/BPF TOPIC] Enabling change notification for network and cluster fs

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Message-ID: <YhjeX0HvXbED65IM@casper.infradead.org>
Date:   Fri, 25 Feb 2022 13:49:19 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Vivek Goyal <vgoyal@...hat.com>
Cc:     Steve French <smfrench@...il.com>,
        lsf-pc@...ts.linux-foundation.org,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ioannis Angelakopoulos <jaggel@...edu>
Subject: Re: [LSF/MM/BPF TOPIC] Enabling change notification for network and
 cluster fs

On Fri, Feb 25, 2022 at 08:23:20AM -0500, Vivek Goyal wrote:
> What about local events. I am assuming you want to supress local events
> and only deliver remote events. Because having both local and remote
> events delivered at the same time will be just confusing at best.

This paragraph confuses me.  If I'm writing, for example, a file manager
and I want it to update its display automatically when another task alters
the contents of a directory, I don't care whether the modification was
done locally or remotely.

If I understand the SMB protocol correctly, it allows the client to take
out a lease on a directory and not send its modifications back to the
server until the client chooses to (or the server breaks the lease).
So you wouldn't get any remote notifications because the client hasn't
told the server.