linux-kernel - Re: [PATCH] eventfs: Stop using dcache

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Message-ID: <CAHk-=wg=tnnsTjnzTs8xRQOBLvw4ceKe7=yxfzNtx4Z9gb-xJw@mail.gmail.com>
Date: Wed, 3 Jan 2024 11:57:14 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>, 
	Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Al Viro <viro@...iv.linux.org.uk>, 
	Christian Brauner <brauner@...nel.org>, linux-fsdevel@...r.kernel.org, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] eventfs: Stop using dcache_readdir() for getdents()

On Wed, 3 Jan 2024 at 11:52, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> This doesn't work because for tracefs (not eventfs) the dentries are
> created at boot up and before the file system is mounted. This means you
> can't even set a gid in /etc/fstab. This will cause a regression.

Which is why I suggested

   "I think the whole thing was triggered by commit 49d67e445742, and
    maybe the fix is to just revert that commit"

there was never any coherent reason for that commit, since the
permissions are dealt with at the mount point.

So this all was triggered by that original change that makes little
sense. The fact that you then apparently changed other things
afterwards too might need fixing.

Or, you know, you could do what I've told you to do at least TEN TIMES
already, which is to not mess with any of this, and just implement the
'->permission()' callback (and getattr() to just make 'ls' look sane
too, rather than silently saying "we'll act as if gid is set right,
but not show it").

Why do you keep bringing up things that I've told you solutions for many times?

                 Linus