From: Ian Kent <raven@themaw.net>
To: David Howells <dhowells@redhat.com>, Miklos Szeredi <miklos@szeredi.hu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Casey Schaufler <casey@schaufler-ca.com>,
Stephen Smalley <sds@tycho.nsa.gov>,
Nicolas Dichtel <nicolas.dichtel@6wind.com>,
Christian Brauner <christian@brauner.io>,
andres@anarazel.de, Jeff Layton <jlayton@redhat.com>,
dray@redhat.com, Karel Zak <kzak@redhat.com>,
keyrings@vger.kernel.org, Linux API <linux-api@vger.kernel.org>,
linux-fsdevel@vger.kernel.org,
LSM <linux-security-module@vger.kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 13/17] watch_queue: Implement mount topology and attribute change notifications [ver #5]
Date: Mon, 03 Aug 2020 20:01:27 +0800 [thread overview]
Message-ID: <303106be4785135446e56cb606138a6e94885887.camel@themaw.net> (raw)
In-Reply-To: <1576646.1596455376@warthog.procyon.org.uk>
On Mon, 2020-08-03 at 12:49 +0100, David Howells wrote:
> Miklos Szeredi <miklos@szeredi.hu> wrote:
>
> > OTOH mount notification is way smaller and IMO a more mature
> > interface. So just picking the unique ID patch into this set might
> > make sense.
>
> But userspace can't retrieve the unique ID without fsinfo() as things
> stand.
>
> I'm changing it so that the fields are 64-bit, but initialised with
> the
> existing mount ID in the notifications set. The fsinfo set changes
> that to a
> unique ID. I'm tempted to make the unique IDs start at UINT_MAX+1 to
> disambiguate them.
Mmm ... so what would I use as a mount id that's not used, like NULL
for strings?
I'm using -1 now but changing this will mean I need something
different.
Could we set aside a mount id that will never be used so it can be
used for this case?
Maybe mount ids should start at 1 instead of zero ...
Ian
next prev parent reply other threads:[~2020-08-03 12:03 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-18 15:03 [PATCH 00/17] pipe: Keyrings, mount and superblock notifications [ver #5] David Howells
2020-03-18 15:03 ` [PATCH 01/17] uapi: General notification queue definitions " David Howells
2020-03-18 15:03 ` [PATCH 02/17] security: Add hooks to rule on setting a watch " David Howells
2020-03-18 18:56 ` James Morris
2020-03-18 15:03 ` [PATCH 03/17] security: Add a hook for the point of notification insertion " David Howells
2020-03-18 18:57 ` James Morris
2020-03-18 15:03 ` [PATCH 04/17] pipe: Add O_NOTIFICATION_PIPE " David Howells
2020-03-18 15:03 ` [PATCH 05/17] pipe: Add general notification queue support " David Howells
2020-03-18 15:04 ` [PATCH 06/17] watch_queue: Add a key/keyring notification facility " David Howells
2020-03-18 19:04 ` James Morris
2020-03-18 15:04 ` [PATCH 07/17] Add sample notification program " David Howells
2020-03-18 15:04 ` [PATCH 08/17] pipe: Allow buffers to be marked read-whole-or-error for notifications " David Howells
2020-03-18 15:04 ` [PATCH 09/17] pipe: Add notification lossage handling " David Howells
2020-03-18 15:04 ` [PATCH 10/17] selinux: Implement the watch_key security hook " David Howells
2020-03-18 19:06 ` James Morris
2020-03-18 15:04 ` [PATCH 11/17] smack: Implement the watch_key and post_notification hooks " David Howells
2020-03-18 15:05 ` [PATCH 12/17] watch_queue: Add security hooks to rule on setting mount and sb watches " David Howells
2020-03-18 19:07 ` James Morris
2020-03-18 15:05 ` [PATCH 13/17] watch_queue: Implement mount topology and attribute change notifications " David Howells
2020-04-02 15:19 ` Miklos Szeredi
2020-06-14 3:07 ` Ian Kent
2020-06-15 8:44 ` Miklos Szeredi
2020-07-23 10:48 ` David Howells
2020-08-03 9:29 ` Miklos Szeredi
2020-08-04 11:38 ` Ian Kent
2020-08-04 13:19 ` Miklos Szeredi
2020-08-05 1:53 ` Ian Kent
2020-08-05 7:43 ` Miklos Szeredi
2020-08-05 11:36 ` Ian Kent
2020-08-05 11:56 ` Miklos Szeredi
2020-07-24 10:19 ` David Howells
2020-07-24 10:44 ` Ian Kent
2020-07-24 11:36 ` David Howells
2020-08-03 10:02 ` Miklos Szeredi
2020-08-03 10:08 ` David Howells
2020-08-03 10:18 ` David Howells
2020-08-03 11:17 ` Miklos Szeredi
2020-08-03 11:49 ` David Howells
2020-08-03 12:01 ` Ian Kent [this message]
2020-08-03 12:31 ` David Howells
2020-08-03 14:30 ` Ian Kent
2020-03-18 15:05 ` [PATCH 14/17] watch_queue: sample: Display mount tree " David Howells
2020-03-18 15:05 ` [PATCH 15/17] watch_queue: Introduce a non-repeating system-unique superblock ID " David Howells
2020-03-18 15:05 ` [PATCH 16/17] watch_queue: Add superblock notifications " David Howells
2020-03-18 15:05 ` [PATCH 17/17] watch_queue: sample: Display " David Howells
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