linux-kernel - Re: [PATCH 01/12] iomap: check if folio size is equal to FS block size

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Message-ID: <ZwT9-eOVV7eGK_w1@infradead.org>
Date: Tue, 8 Oct 2024 02:40:09 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Goldwyn Rodrigues <rgoldwyn@...e.de>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Goldwyn Rodrigues <rgoldwyn@...e.com>
Subject: Re: [PATCH 01/12] iomap: check if folio size is equal to FS block
 size

On Fri, Oct 04, 2024 at 04:04:28PM -0400, Goldwyn Rodrigues wrote:
> From: Goldwyn Rodrigues <rgoldwyn@...e.com>
> 
> Filesystems such as BTRFS use folio->private so that they receive a
> callback while releasing folios. Add check if folio size is same as
> filesystem block size while evaluating iomap_folio_state from
> folio->private.
> 
> I am hoping this will be removed when all of btrfs code has moved to
> iomap and BTRFS uses iomap's subpage.

iomap owns folio->private, so please make sure this isn't
needed before moving out of RFC state.