linux-kernel - Re: [PATCH 5.15] fuse: Fix race condition in writethrough path A race

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Message-ID: <aO54nHhk_R1rs6X8@bfoster>
Date: Tue, 14 Oct 2025 12:21:48 -0400
From: Brian Foster <bfoster@...hat.com>
To: Miklos Szeredi <miklos@...redi.hu>
Cc: lu gu <giveme.gulu@...il.com>, Joanne Koong <joannelkoong@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bernd Schubert <bernd@...ernd.com>
Subject: Re: [PATCH 5.15] fuse: Fix race condition in writethrough path A race

On Tue, Oct 14, 2025 at 06:10:45PM +0200, Miklos Szeredi wrote:
> On Tue, 14 Oct 2025 at 15:57, Brian Foster <bfoster@...hat.com> wrote:
> 
> > But TBH, if the writeback thing or something similarly simple works for
> > resolving the immediate bug, I wouldnt worry too much about it
> > until/unless there are userspace fs' explicitly looking for that sort of
> > behavior. Just my .02.
> 
> Agreed.
> 
> I just feel it unfortunate that this is default in libfuse and so many
> filesystems will have auto_inval_data enabled which don't even need
> it, and some mixed read-write workloads suffering badly as a
> consequence.
> 

Maybe it didnt really need to be on by default? I don't recall caring
much about that (but again, long time ago) as long as the fs that wants
it can enable it.

Brian

> Thanks,
> Miklos
>