linux-kernel - Re: Upcoming: Notifications, FS notifications and fsinfo()

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Message-ID: <20200401090445.6t73dt7gz36bv4rh@ws.net.home>
Date:   Wed, 1 Apr 2020 11:04:45 +0200
From:   Karel Zak <kzak@...hat.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        torvalds@...ux-foundation.org, viro@...iv.linux.org.uk,
        dray@...hat.com, mszeredi@...hat.com, swhiteho@...hat.com,
        jlayton@...hat.com, raven@...maw.net, andres@...razel.de,
        keyrings@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, lennart@...ttering.net,
        cyphar@...har.com
Subject: Re: Upcoming: Notifications, FS notifications and fsinfo()

On Tue, Mar 31, 2020 at 10:52:52PM +0100, David Howells wrote:
> Christian Brauner <christian.brauner@...ntu.com> wrote:
> 
> > querying all properties of a mount atomically all-at-once,
> 
> I don't actually offer that, per se.
> 
> Having an atomic all-at-once query for a single mount is actually quite a
> burden on the system.  There's potentially a lot of state involved, much of
> which you don't necessarily need.

If all means "all possible attributes" than it is unnecessary, for
example ext4 timestamps or volume uuid/label are rarely necessary.
We usually need together (as consistent set):

    source
    mountpoint
    FS type
    FS root (FSINFO_ATTR_MOUNT_PATH)
    FS options (FSINFO_ATTR_CONFIGURATION)
    VFS attributes
    VFS propagation flags
    mount ID
    parent ID
    devno (or maj:min)

 Karel

-- 
 Karel Zak  <kzak@...hat.com>
 http://karelzak.blogspot.com