linux-ext4 - Re: [PATCH v5 7/7] ext4: Add atomic block write documentation

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Message-ID: <20250516151005.GS25655@frogsfrogsfrogs>
Date: Fri, 16 May 2025 08:10:05 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: Theodore Ts'o <tytso@....edu>
Cc: Carlos Maiolino <cem@...nel.org>, John Garry <john.g.garry@...cle.com>,
	"Ritesh Harjani (IBM)" <ritesh.list@...il.com>,
	linux-ext4@...r.kernel.org, Jan Kara <jack@...e.cz>,
	Ojaswin Mujoo <ojaswin@...ux.ibm.com>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v5 7/7] ext4: Add atomic block write documentation

On Fri, May 16, 2025 at 10:48:17AM -0400, Theodore Ts'o wrote:
> On Fri, May 16, 2025 at 03:31:17PM +0200, Carlos Maiolino wrote:
> > 
> > This is likely the final state for XFS merge-window and I hope to
> > send it to Linus as soon as the merge window opens.
> 
> Very cool!
> 
> I've taken a quick peek, and it looks like the only XFS-specific
> atomic writes is an XFS mount option.  Am I missing anything?
> 
> I want to keep merging the ext4 and xfs atomic write patchsets simple,
> so I'd prefer not to have any git-level dependencies on the branches.
> If we're confident that the xfs changes are going to land at the next
> merge window,

/I/ for one hope that the xfs changes land this time around.

> given that the ext4 patch set is pretty much ready to
> land in the ext4 tree, how about updating the documentation in a
> follow-up patch.
> 
> I can either append the commit which generalizes the documentation to
> the ext4 tree, or if it turns out that there is a v6 needed of the
> ext4 atomic write patchset, we can fold the documentation update into
> the "ext4: add atomic block write documentation" commit and rename it
> to "Documentation: add atomic write block documentation."
> 
> Does that seem reasonable?

I think it's ok to combine them after the merge.  It would be useful to
have a single programmer's guide that takes a person through the whole
process of determining the block device's atomic write capabilities,
formatting either an XFS or ext4 filesystem appropriately, and then
presents a toy program to discover the atomic write limits on an open
file and uses that to queue a single IO.

--D

> 
> Cheers,
> 
> 					- Ted
>