linux-kernel - Re: [PATCH 1/4] fs: replace FOP_DIO_PARALLEL

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Message-ID: <20251105140410.GA22325@lst.de>
Date: Wed, 5 Nov 2025 15:04:10 +0100
From: Christoph Hellwig <hch@....de>
To: "Nirjhar Roy (IBM)" <nirjhar.roy.lists@...il.com>
Cc: Christoph Hellwig <hch@....de>, Carlos Maiolino <cem@...nel.org>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-raid@...r.kernel.org,
	linux-block@...r.kernel.org
Subject: Re: [PATCH 1/4] fs: replace FOP_DIO_PARALLEL_WRITE with a fmode
 bits

On Tue, Nov 04, 2025 at 12:30:06PM +0530, Nirjhar Roy (IBM) wrote:
> On Wed, 2025-10-29 at 08:15 +0100, Christoph Hellwig wrote:
> > To properly handle the direct to buffered I/O fallback for devices that
> > require stable writes, we need to be able to set the DIO_PARALLEL_WRITE
> > on a per-file basis and no statically for a given file_operations
> > instance.
> So, is the fallback configurable(like we can turn it on/off)? Looking at
> the code it seems like it is not. Any reason for not making it
> configurable?

Please read the cover letter.