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List:       linux-keyrings
Subject:    Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2]
From:       David Howells <dhowells () redhat ! com>
Date:       2019-10-31 15:15:53
Message-ID: 17311.1572534953 () warthog ! procyon ! org ! uk
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Konstantin Khlebnikov <khlebnikov@yandex-team.ru> wrote:

> Similar synchronization is required for reusing memory after vmsplice()?
> I don't see other way how sender could safely change these pages.

Sounds like a point - if you have multiple parallel contributors to the pip=
e
via vmsplice(), then FIONREAD is of no use.  To use use FIONREAD, you have =
to
let the pipe become empty before you can be sure.

David

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