linux-kernel - Re: [PATCH 08/11] fs: add support for non-blocking timestamp updates

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Message-ID: <37febb65-038e-47a7-9a5b-3b4c2773994f@gmail.com>
Date: Mon, 22 Dec 2025 21:38:29 -0800
From: Chaitanya Kulkarni <ckulkarnilinux@...il.com>
To: Christoph Hellwig <hch@....de>, Christian Brauner <brauner@...nel.org>
Cc: Al Viro <viro@...iv.linux.org.uk>, David Sterba <dsterba@...e.com>,
 Jan Kara <jack@...e.cz>, Mike Marshall <hubcap@...ibond.com>,
 Martin Brandenburg <martin@...ibond.com>, Carlos Maiolino <cem@...nel.org>,
 Stefan Roesch <shr@...com>, Jeff Layton <jlayton@...nel.org>,
 linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, gfs2@...ts.linux.dev,
 io-uring@...r.kernel.org, devel@...ts.orangefs.org,
 linux-unionfs@...r.kernel.org, linux-mtd@...ts.infradead.org,
 linux-xfs@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: [PATCH 08/11] fs: add support for non-blocking timestamp updates

On 12/22/25 16:37, Christoph Hellwig wrote:
> Currently file_update_time_flags unconditionally returns -EAGAIN if any
> timestamp needs to be updated and IOCB_NOWAIT is passed.  This makes
> non-blocking direct writes impossible on file systems with granular
> enough timestamps.
>
> Add a S_NOWAIT to ask for timestamps to not block, and return -EAGAIN in
> all methods for now.
>
> Signed-off-by: Christoph Hellwig<hch@....de>
> Reviewed-by: Jeff Layton<jlayton@...nel.org>

Looks good.

Reviewed-by: Chaitanya Kulkarni <kch@...dia.com>

-ck