linux-kernel - Re: [PATCH v5 03/10] xfs: Refactor xfs_reflink_end_cow

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Message-ID: <Z9E2kSQs-wL2a074@infradead.org>
Date: Wed, 12 Mar 2025 00:24:01 -0700
From: Christoph Hellwig <hch@...radead.org>
To: John Garry <john.g.garry@...cle.com>
Cc: brauner@...nel.org, djwong@...nel.org, cem@...nel.org,
	linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, ojaswin@...ux.ibm.com,
	ritesh.list@...il.com, martin.petersen@...cle.com
Subject: Re: [PATCH v5 03/10] xfs: Refactor xfs_reflink_end_cow_extent()

On Mon, Mar 10, 2025 at 06:39:39PM +0000, John Garry wrote:
> Refactor xfs_reflink_end_cow_extent() into separate parts which process
> the CoW range and commit the transaction.
> 
> This refactoring will be used in future for when it is required to commit
> a range of extents as a single transaction, similar to how it was done
> pre-commit d6f215f359637.

Darrick pointed out that if you do more than just a tiny number
of extents per transactions you run out of log reservations very
quickly here:

https://lore.kernel.org/all/20240329162936.GI6390@frogsfrogsfrogs/

how does your scheme deal with that?