linux-kernel - Re: [PATCH] iomap: use largest_zero_folio() in iomap_dio

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Message-ID: <20250815-gauner-brokkoli-1855864a9dff@brauner>
Date: Fri, 15 Aug 2025 16:02:58 +0200
From: Christian Brauner <brauner@...nel.org>
To: "Darrick J . Wong" <djwong@...nel.org>,
	"Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
Cc: Christian Brauner <brauner@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	mcgrof@...nel.org,
	gost.dev@...sung.com,
	linux-xfs@...r.kernel.org,
	Pankaj Raghav <p.raghav@...sung.com>
Subject: Re: [PATCH] iomap: use largest_zero_folio() in iomap_dio_zero()

On Thu, 14 Aug 2025 16:21:37 +0200, Pankaj Raghav (Samsung) wrote:
> iomap_dio_zero() uses a custom allocated memory of zeroes for padding
> zeroes. This was a temporary solution until there was a way to request a
> zero folio that was greater than the PAGE_SIZE.
> 
> Use largest_zero_folio() function instead of using the custom allocated
> memory of zeroes. There is no guarantee from largest_zero_folio()
> function that it will always return a PMD sized folio. Adapt the code so
> that it can also work if largest_zero_folio() returns a ZERO_PAGE.
> 
> [...]

Applied to the vfs-6.18.iomap branch of the vfs/vfs.git tree.
Patches in the vfs-6.18.iomap branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs-6.18.iomap

[1/1] iomap: use largest_zero_folio() in iomap_dio_zero()
      https://git.kernel.org/vfs/vfs/c/5589673e8d8d