linux-kernel - Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]

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Message-ID: <108165.1582908148@warthog.procyon.org.uk>
Date:   Fri, 28 Feb 2020 16:42:28 +0000
From:   David Howells <dhowells@...hat.com>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     dhowells@...hat.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ian Kent <raven@...maw.net>, Karel Zak <kzak@...hat.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Steven Whitehouse <swhiteho@...hat.com>,
        viro <viro@...iv.linux.org.uk>,
        Christian Brauner <christian@...uner.io>,
        Jann Horn <jannh@...gle.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Linux API <linux-api@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Lennart Poettering <lennart@...ttering.net>,
        Zbigniew Jędrzejewski-Szmek <zbyszek@...waw.pl>,
        util-linux@...r.kernel.org
Subject: Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]

Miklos Szeredi <miklos@...redi.hu> wrote:

>   children/$CHILD_ID -> ../../$CHILD_ID

This would really suck.  This bit would particularly affect rescanning time.

You also really want to read the entire child set atomically and, ideally,
include notification counters.

>  supers/$SUPER_ID/
>    type: fstype
>    source: mount source (devname)
>    options: csv of mount options

There's a lot more to fsinfo() than just this lot - and there's the
possibility that some of the values may change depending on exactly which file
you're looking at.

David