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Date:   Sat, 20 Feb 2021 03:40:13 +0000
From:   Matthew Wilcox <willy@infradead.org>
To:     Erik Jensen <erikjensen@rkjnsn.net>
Cc:     Theodore Ts'o <tytso@mit.edu>, Qu Wenruo <quwenruo.btrfs@gmx.com>,
        Linux FS Devel <linux-fsdevel@vger.kernel.org>,
        "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: page->index limitation on 32bit system?
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On Fri, Feb 19, 2021 at 06:20:43PM -0800, Erik Jensen wrote:
> I assume the 4KiB entry size in the page cache is fundamental, and can't be,
> e.g., increased to 16KiB to allow addressing up to 64TiB of storage?

The bootlin link i sent in the other email does exactly that.