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From: Miklos Szeredi <miklos@szeredi.hu>
To: Amir Goldstein <amir73il@gmail.com>
Cc: Alexander Larsson <alexl@redhat.com>,
	overlayfs <linux-unionfs@vger.kernel.org>
Subject: Re: Lazy lowerdata lookup and data-only layers (Was: Re: Composefs:)
Date: Wed, 12 Apr 2023 16:20:50 +0200	[thread overview]
Message-ID: <CAJfpegtb4q+Oeqq8w6SpajX_YoVeJwkb1Frz+6Urwy6MXwg2sQ@mail.gmail.com> (raw)
In-Reply-To: <CAOQ4uxjhtwXfqfCeRRp2QW=NaxvVFjo2of1X95gEazV=1-x6wQ@mail.gmail.com>

On Wed, 12 Apr 2023 at 16:07, Amir Goldstein <amir73il@gmail.com> wrote:

> To elaborate:
>
> lowerdir="lo1:lo2:lo3::do1:do2:do3" is allowed
>
> :: must have non-zero lower layers on the left side
> and non-zero data-only layers on the right side.

Okay.   Can you please add this to the documentation?

>
> Actually, this feature originates from a request from Alexander to
> respect opaque root dir in lower layers, but I preferred to make this
> change of behavior opt-in so it can be tested by userspace.

Not sure I get that.  Does "opaque root dir" mean that only absolute
redirects can access layers below such a layer?

I guess that's not something that works today.  Or am I mistaken?

I also don't get what you mean by testing in userspace.  Can you ellaborate?

>
> I took it one step further than the opaque root dir request -
> the lookup in data-only is a generic vfs_path_lookup() of an
> absolute path redirect from one of the lowerdirs, with no
> checking of redirect/metacopy/opque xattrs.
>
> And then I only implemented lazy lookup for the lookup
> in those new data-only layers, which made things simpler.

Okay, makes sense.  If someone hits this limitation, then we can
always start thinking about generalizing this feature.

> Please see the patches I just posted for details [1].

Will do.

Thanks,
Miklos

  reply	other threads:[~2023-04-12 14:21 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-20 15:23 [PATCH v3 0/6] Composefs: an opportunistically sharing verified image filesystem Alexander Larsson
2023-01-20 15:23 ` [PATCH v3 1/6] fsverity: Export fsverity_get_digest Alexander Larsson
2023-01-20 15:23 ` [PATCH v3 2/6] composefs: Add on-disk layout header Alexander Larsson
2023-01-20 15:23 ` [PATCH v3 3/6] composefs: Add descriptor parsing code Alexander Larsson
2023-01-20 15:23 ` [PATCH v3 4/6] composefs: Add filesystem implementation Alexander Larsson
2023-01-20 15:23 ` [PATCH v3 5/6] composefs: Add documentation Alexander Larsson
2023-01-21  2:19   ` Bagas Sanjaya
2023-01-20 15:23 ` [PATCH v3 6/6] composefs: Add kconfig and build support Alexander Larsson
2023-01-20 19:44 ` [PATCH v3 0/6] Composefs: an opportunistically sharing verified image filesystem Amir Goldstein
2023-01-20 22:18   ` Giuseppe Scrivano
2023-01-21  3:08     ` Gao Xiang
2023-01-21 16:19       ` Giuseppe Scrivano
2023-01-21 17:15         ` Gao Xiang
2023-01-21 22:34           ` Giuseppe Scrivano
2023-01-22  0:39             ` Gao Xiang
2023-01-22  9:01               ` Giuseppe Scrivano
2023-01-22  9:32                 ` Giuseppe Scrivano
2023-01-24  0:08                   ` Gao Xiang
2023-01-21 10:57     ` Amir Goldstein
2023-01-21 15:01       ` Giuseppe Scrivano
2023-01-21 15:54         ` Amir Goldstein
2023-01-21 16:26           ` Gao Xiang
2023-01-23 17:56   ` Alexander Larsson
2023-01-23 23:59     ` Gao Xiang
2023-01-24  3:24     ` Amir Goldstein
2023-01-24 13:10       ` Alexander Larsson
2023-01-24 14:40         ` Gao Xiang
2023-01-24 19:06         ` Amir Goldstein
2023-01-25  4:18           ` Dave Chinner
2023-01-25  8:32             ` Amir Goldstein
2023-01-25 10:08               ` Alexander Larsson
2023-01-25 10:43                 ` Amir Goldstein
2023-01-25 10:39               ` Giuseppe Scrivano
2023-01-25 11:17                 ` Amir Goldstein
2023-01-25 12:30                   ` Giuseppe Scrivano
2023-01-25 12:46                     ` Amir Goldstein
2023-01-25 13:10                       ` Giuseppe Scrivano
2023-01-25 18:07                         ` Amir Goldstein
2023-01-25 19:45                           ` Giuseppe Scrivano
2023-01-25 20:23                             ` Amir Goldstein
2023-01-25 20:29                               ` Amir Goldstein
2023-01-26  5:26                                 ` userns mount and metacopy redirects (Was: Re: [PATCH v3 0/6] Composefs: an opportunistically sharing verified image filesystem) Amir Goldstein
2023-01-26  8:22                                   ` Christian Brauner
2023-01-27 15:57                               ` [PATCH v3 0/6] Composefs: an opportunistically sharing verified image filesystem Vivek Goyal
2023-01-25 15:24                       ` Christian Brauner
2023-01-25 16:05                         ` Giuseppe Scrivano
2023-01-25  9:37           ` Alexander Larsson
2023-01-25 10:05             ` Gao Xiang
2023-01-25 10:15               ` Alexander Larsson
2023-01-27 10:24                 ` Gao Xiang
2023-02-01  4:28                   ` Jingbo Xu
2023-02-01  7:44                     ` Amir Goldstein
2023-02-01  8:59                       ` Jingbo Xu
2023-02-01  9:52                         ` Alexander Larsson
2023-02-01 12:39                           ` Jingbo Xu
2023-02-01  9:46                     ` Alexander Larsson
2023-02-01 10:01                       ` Gao Xiang
2023-02-01 11:22                         ` Gao Xiang
2023-02-02  6:37                           ` Amir Goldstein
2023-02-02  7:17                             ` Gao Xiang
2023-02-02  7:37                               ` Gao Xiang
2023-02-03 11:32                                 ` Alexander Larsson
2023-02-03 12:46                                   ` Amir Goldstein
2023-02-03 15:09                                     ` Gao Xiang
2023-02-05 19:06                                       ` Amir Goldstein
2023-02-06  7:59                                         ` Amir Goldstein
2023-02-06 10:35                                         ` Miklos Szeredi
2023-02-06 13:30                                           ` Amir Goldstein
2023-02-06 16:34                                             ` Miklos Szeredi
2023-02-06 17:16                                               ` Amir Goldstein
2023-02-06 18:17                                                 ` Amir Goldstein
2023-02-06 19:32                                                 ` Miklos Szeredi
2023-02-06 20:06                                                   ` Amir Goldstein
2023-02-07  8:12                                                     ` Alexander Larsson
2023-04-03 19:00                                                 ` Lazy lowerdata lookup and data-only layers (Was: Re: Composefs:) Amir Goldstein
2023-04-11 15:50                                                   ` Miklos Szeredi
2023-04-12 14:06                                                     ` Amir Goldstein
2023-04-12 14:20                                                       ` Miklos Szeredi [this message]
2023-04-12 15:41                                                         ` Amir Goldstein
2023-02-06 12:51                                         ` [PATCH v3 0/6] Composefs: an opportunistically sharing verified image filesystem Alexander Larsson
2023-02-07  8:12                                         ` Jingbo Xu
2023-02-06 12:43                                     ` Alexander Larsson
2023-02-06 13:27                                       ` Gao Xiang
2023-02-06 15:31                                         ` Alexander Larsson
2023-02-01 12:06                       ` Jingbo Xu
2023-02-02  4:57                       ` Jingbo Xu
2023-02-02  4:59                         ` Jingbo Xu

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