From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@lst.de>
Date: Thu, 20 Jul 2023 14:09:10 +0200
Subject: [Cluster-devel] [PATCH 16/17] block: use iomap for writes to
 block devices
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 <ZG09wR4WOI8zDxJK@dread.disaster.area>
 <ZG4SGYOogQtEZrll@casper.infradead.org>
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On Wed, May 24, 2023 at 02:33:13PM +0100, Matthew Wilcox wrote:
> As you can see, do_page_cache_ra() does limit readahead to i_size.
> Is ractl->mapping->host the correct way to find the inode?  I always
> get confused.

As far as I can tell it is the right inode, the indirection through
file->f_mapping ensures it actually points to the backing inode.