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From: Miklos Szeredi <miklos@szeredi.hu>
To: David Howells <dhowells@redhat.com>
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>,
	Ian Kent <raven@themaw.net>,
	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, 3 Aug 2020 11:29:27 +0200	[thread overview]
Message-ID: <CAJfpeguvLMCw1H8+DPsfZE_k0sEiRtA17pD9HjnceSsAvqqAZw@mail.gmail.com> (raw)
In-Reply-To: <1293241.1595501326@warthog.procyon.org.uk>

On Thu, Jul 23, 2020 at 12:48 PM David Howells <dhowells@redhat.com> wrote:

>
> > >                 __u32   topology_changes;
> > >                 __u32   attr_changes;
> > >                 __u32   aux_topology_changes;
> >
> > Being 32bit this introduces wraparound effects.  Is that really worth it?
>
> You'd have to make 2 billion changes without whoever's monitoring getting a
> chance to update their counters.  But maybe it's not worth it putting them
> here.  If you'd prefer, I can make the counters all 64-bit and just retrieve
> them with fsinfo().

Yes, I think that would be preferable.

> > >         n->watch.info & NOTIFY_MOUNT_IS_RECURSIVE if true indicates that
> > >         the notifcation was generated by an event (eg. SETATTR) that was
> > >         applied recursively.  The notification is only generated for the
> > >         object that initially triggered it.
> >
> > Unused in this patchset.  Please don't add things to the API which are not
> > used.
>
> Christian Brauner has patches for mount_setattr() that will need to use this.

Fine, then that patch can add the flag.

Thanks,
Miklos

  reply	other threads:[~2020-08-03  9:30 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 " 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 [this message]
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
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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