linux-kernel - Re: [GIT PULL] Filesystem Information

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Message-ID: <CAJfpegunY3fuxh486x9ysKtXbhTE0745ZCVHcaqs9Gww9RV2CQ@mail.gmail.com>
Date:   Mon, 3 Aug 2020 18:42:41 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     David Howells <dhowells@...hat.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>, Ian Kent <raven@...maw.net>,
        Karel Zak <kzak@...hat.com>, Jeff Layton <jlayton@...hat.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Christian Brauner <christian@...uner.io>,
        Lennart Poettering <lennart@...ttering.net>,
        Linux API <linux-api@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org,
        LSM <linux-security-module@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] Filesystem Information

On Mon, Aug 3, 2020 at 5:50 PM David Howells <dhowells@...hat.com> wrote:
>
>
> Hi Linus,
>
> Here's a set of patches that adds a system call, fsinfo(), that allows
> information about the VFS, mount topology, superblock and files to be
> retrieved.
>
> The patchset is based on top of the mount notifications patchset so that
> the mount notification mechanism can be hooked to provide event counters
> that can be retrieved with fsinfo(), thereby making it a lot faster to work
> out which mounts have changed.
>
> Note that there was a last minute change requested by Miklós: the event
> counter bits got moved from the mount notification patchset to this one.
> The counters got made atomic_long_t inside the kernel and __u64 in the
> UAPI.  The aggregate changes can be assessed by comparing pre-change tag,
> fsinfo-core-20200724 to the requested pull tag.
>
> Karel Zak has created preliminary patches that add support to libmount[*]
> and Ian Kent has started working on making systemd use these and mount
> notifications[**].

So why are you asking to pull at this stage?

Has anyone done a review of the patchset?

I think it's obvious that this API needs more work.  The integration
work done by Ian is a good direction, but it's not quite the full
validation and review that a complex new API needs.

At least that's my opinion.

Thanks,
Miklos