linux-kernel - Re: [PATCH 2/3] fd/locks: allow get the lock owner by F_OFD

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Message-ID: <5f644a24-90b5-a02f-b593-49336e8e0f5a@yandex.ru>
Date:   Tue, 20 Jun 2023 16:45:16 +0500
From:   stsp <stsp2@...dex.ru>
To:     Jeff Layton <jlayton@...nel.org>, linux-kernel@...r.kernel.org
Cc:     Chuck Lever <chuck.lever@...cle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 2/3] fd/locks: allow get the lock owner by F_OFD_GETLK

20.06.2023 16:12, Jeff Layton пишет:
> Multithreaded processes are also a bit of a gray area here: Suppose I
> open a file and set an OFD lock on it in one task, and then let that
> task exit while the file is still open. What should l_pid say in that
> case?

If by the "task" you mean a process, then
the result should be no lock at all.
If you mean the thread exit, then I would
expect l_pid to contain tgid, in which case
it will still point to the valid pid.
Or do you mean l_pid contains tid?
Checking... no, l_pid contains tgid.
So I don't really see the problem you are
pointing with the above example, could
you please clarify?