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From: Miklos Szeredi <miklos@szeredi.hu>
To: Ian Kent <raven@themaw.net>
Cc: Miklos Szeredi <mszeredi@redhat.com>,
	James Bottomley <James.Bottomley@hansenpartnership.com>,
	Steven Whitehouse <swhiteho@redhat.com>,
	David Howells <dhowells@redhat.com>,
	viro <viro@zeniv.linux.org.uk>,
	Christian Brauner <christian@brauner.io>,
	Jann Horn <jannh@google.com>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	Linux API <linux-api@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]
Date: Thu, 27 Feb 2020 10:36:38 +0100	[thread overview]
Message-ID: <CAJfpegtRoXnPm5_sMYPL2L6FCZU52Tn8wk7NcW-dm4_2x=dD3Q@mail.gmail.com> (raw)
In-Reply-To: <1c8db4e2b707f958316941d8edd2073ee7e7b22c.camel@themaw.net>

On Thu, Feb 27, 2020 at 6:06 AM Ian Kent <raven@themaw.net> wrote:

> At the least the question of "do we need a highly efficient way
> to query the superblock parameters all at once" needs to be
> extended to include mount table enumeration as well as getting
> the info.
>
> But this is just me thinking about mount table handling and the
> quite significant problem we now have with user space scanning
> the proc mount tables to get this information.

Right.

So the problem is that currently autofs needs to rescan the proc mount
table on every change.   The solution to that is to

 - add a notification mechanism
 - and a way to selectively query mount/superblock information

right?

For the notification we have uevents in sysfs, which also supplies the
changed parameters.  Taking aside namespace issues and addressing
mounts would this work for autofs?

Thanks,
Miklos

  reply	other threads:[~2020-02-27  9:36 UTC|newest]

Thread overview: 117+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-21 18:01 [PATCH 00/17] VFS: Filesystem information and notifications [ver #17] David Howells
2020-02-21 18:01 ` [PATCH 01/17] watch_queue: Add security hooks to rule on setting mount and sb watches " David Howells
2020-02-21 18:02 ` [PATCH 02/17] watch_queue: Implement mount topology and attribute change notifications " David Howells
2020-02-21 18:02 ` [PATCH 03/17] watch_queue: sample: Display mount tree " David Howells
2020-02-21 18:02 ` [PATCH 04/17] watch_queue: Introduce a non-repeating system-unique superblock ID " David Howells
2020-02-21 18:02 ` [PATCH 05/17] watch_queue: Add superblock notifications " David Howells
2020-02-21 18:02 ` [PATCH 06/17] watch_queue: sample: Display " David Howells
2020-02-21 18:02 ` [PATCH 07/17] fsinfo: Add fsinfo() syscall to query filesystem information " David Howells
2020-02-26  2:29   ` Aleksa Sarai
2020-02-28 14:44   ` David Howells
2020-02-21 18:02 ` [PATCH 08/17] fsinfo: Provide a bitmap of supported features " David Howells
2020-02-21 18:03 ` [PATCH 09/17] fsinfo: Allow fsinfo() to look up a mount object by ID " David Howells
2020-02-21 18:03 ` [PATCH 10/17] fsinfo: Allow mount information to be queried " David Howells
2020-03-04 14:58   ` Miklos Szeredi
2020-03-04 16:10   ` Miklos Szeredi
2020-02-21 18:03 ` [PATCH 11/17] fsinfo: sample: Mount listing program " David Howells
2020-02-21 18:03 ` [PATCH 12/17] fsinfo: Allow the mount topology propogation flags to be retrieved " David Howells
2020-02-21 18:03 ` [PATCH 13/17] fsinfo: Query superblock unique ID and notification counter " David Howells
2020-02-21 18:03 ` [PATCH 14/17] fsinfo: Add API documentation " David Howells
2020-02-21 18:03 ` [PATCH 15/17] fsinfo: Add support for AFS " David Howells
2020-02-21 18:03 ` [PATCH 16/17] fsinfo: Add example support for Ext4 " David Howells
2020-02-21 18:04 ` [PATCH 17/17] fsinfo: Add example support for NFS " David Howells
2020-02-21 20:21 ` [PATCH 00/17] VFS: Filesystem information and notifications " James Bottomley
2020-02-24 10:24   ` Miklos Szeredi
2020-02-24 14:55     ` James Bottomley
2020-02-24 15:28       ` Miklos Szeredi
2020-02-25 12:13         ` Steven Whitehouse
2020-02-25 15:28           ` James Bottomley
2020-02-25 15:47             ` Steven Whitehouse
2020-02-26  9:11             ` Miklos Szeredi
2020-02-26 10:51               ` Steven Whitehouse
2020-02-27  5:06               ` Ian Kent
2020-02-27  9:36                 ` Miklos Szeredi [this message]
2020-02-27 11:34                   ` Ian Kent
2020-02-27 13:45                     ` Miklos Szeredi
2020-02-27 15:14                       ` Karel Zak
2020-02-28  0:43                         ` Ian Kent
2020-02-28  8:35                           ` Miklos Szeredi
2020-02-28 12:27                             ` Greg Kroah-Hartman
2020-02-28 16:24                               ` Miklos Szeredi
2020-02-28 17:15                                 ` Al Viro
2020-03-02  8:43                                   ` Miklos Szeredi
2020-03-02 10:34                                 ` Karel Zak
2020-02-28 16:42                               ` David Howells
2020-02-28 15:08                             ` James Bottomley
2020-02-28 15:40                               ` Miklos Szeredi
2020-02-28  0:12                       ` Ian Kent
2020-02-28 15:52             ` Christian Brauner
2020-02-28 16:36             ` David Howells
2020-03-02  9:09               ` Miklos Szeredi
2020-03-02  9:38                 ` Greg Kroah-Hartman
2020-03-03  5:27                 ` Ian Kent
2020-03-03  7:46                   ` Miklos Szeredi
2020-03-06 16:25                     ` Miklos Szeredi
2020-03-06 19:43                       ` Al Viro
2020-03-06 19:54                         ` Miklos Szeredi
2020-03-06 19:58                         ` Al Viro
2020-03-06 20:05                           ` Al Viro
2020-03-06 20:11                             ` Miklos Szeredi
2020-03-06 20:37                             ` Al Viro
2020-03-06 20:38                               ` Al Viro
2020-03-06 20:45                                 ` Al Viro
2020-03-06 20:49                                   ` Al Viro
2020-03-06 20:51                                     ` Miklos Szeredi
2020-03-06 21:28                                       ` Al Viro
2020-03-06 20:56                                     ` Al Viro
2020-03-06 20:51                                   ` Miklos Szeredi
2020-03-07  9:48                       ` Greg Kroah-Hartman
2020-03-07 20:48                         ` Miklos Szeredi
2020-03-03  9:12                   ` David Howells
2020-03-03  9:26                     ` Miklos Szeredi
2020-03-03  9:48                       ` Miklos Szeredi
2020-03-03 10:21                         ` Steven Whitehouse
2020-03-03 10:32                           ` Miklos Szeredi
2020-03-03 11:09                             ` Ian Kent
2020-03-03 10:00                       ` Christian Brauner
2020-03-03 10:13                         ` Miklos Szeredi
2020-03-03 10:25                           ` Christian Brauner
2020-03-03 11:33                             ` Miklos Szeredi
2020-03-03 11:56                               ` Christian Brauner
2020-03-03 11:38                       ` Karel Zak
2020-03-03 13:03                         ` Greg Kroah-Hartman
2020-03-03 13:14                           ` Greg Kroah-Hartman
2020-03-03 13:34                             ` Miklos Szeredi
2020-03-03 13:43                               ` Greg Kroah-Hartman
2020-03-03 14:10                                 ` Greg Kroah-Hartman
2020-03-03 14:13                                   ` Jann Horn
2020-03-03 14:24                                     ` Greg Kroah-Hartman
2020-03-03 15:44                                       ` Jens Axboe
2020-03-03 16:37                                         ` Greg Kroah-Hartman
2020-03-03 16:51                                         ` Jeff Layton
2020-03-03 16:55                                           ` Jens Axboe
2020-03-03 19:02                                             ` Jeff Layton
2020-03-03 19:07                                               ` Jens Axboe
2020-03-03 19:23                                               ` Jens Axboe
2020-03-03 19:43                                                 ` Jeff Layton
2020-03-03 20:33                                                   ` Jens Axboe
2020-03-03 21:03                                                     ` Jeff Layton
2020-03-03 21:20                                                       ` Jens Axboe
2020-03-03 14:10                                 ` Miklos Szeredi
2020-03-03 14:29                                   ` Greg Kroah-Hartman
2020-03-03 14:40                                     ` Jann Horn
2020-03-03 16:51                                       ` Greg Kroah-Hartman
2020-03-03 16:57                                         ` Jann Horn
2020-03-03 20:15                                         ` Greg Kroah-Hartman
2020-03-03 14:40                                   ` David Howells
2020-03-04  4:20                                   ` Ian Kent
2020-03-03 14:19                                 ` David Howells
2020-03-03 16:59                                   ` Greg Kroah-Hartman
2020-03-03 14:23                               ` Christian Brauner
2020-03-03 15:23                                 ` Greg Kroah-Hartman
2020-03-03 15:53                                 ` David Howells
2020-03-04  2:01                           ` Ian Kent
2020-03-04 15:22                             ` Karel Zak
2020-03-04 16:49                               ` Greg Kroah-Hartman
2020-03-04 17:55                                 ` Karel Zak
2020-03-03 14:09                         ` David Howells

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