linux-kernel - Re: [PATCH 15/18] fsinfo: Add an attribute that lists all the visible mounts in a namespace [ver #21]

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Date:   Wed, 05 Aug 2020 17:44:12 +0100
From:   David Howells <dhowells@...hat.com>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     dhowells@...hat.com, viro@...iv.linux.org.uk,
        torvalds@...ux-foundation.org, raven@...maw.net,
        mszeredi@...hat.com, christian@...uner.io, jannh@...gle.com,
        darrick.wong@...cle.com, kzak@...hat.com, jlayton@...hat.com,
        linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/18] fsinfo: Add an attribute that lists all the visible mounts in a namespace [ver #21]

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

> > where each element contains a once-in-a-system-lifetime unique ID, the
> > mount ID (which may get reused), the parent mount ID and sums of the
> > notification/change counters for the mount and its superblock.
> 
> The change counters are currently conditional on CONFIG_MOUNT_NOTIFICATIONS.
> Is this is intentional?

Yeah - the counters aren't driven unless CONFIG_MOUNT_NOTIFICATIONS=y.

I could perhaps make it so they're driven in both cases, but driving the
in-subtree counter is somewhat tied up in the notification posting.

This is something that can be fixed after this patchset is taken - if it is
taken since that doesn't change the UAPI.

David