linux-ext4 - Re: [PATCH 16/17] block: use iomap for writes to block devices

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Date:   Thu, 20 Jul 2023 14:09:10 +0200
From:   Christoph Hellwig <hch@....de>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Dave Chinner <david@...morbit.com>, Hannes Reinecke <hare@...e.de>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Miklos Szeredi <miklos@...redi.hu>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Howells <dhowells@...hat.com>,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        ceph-devel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-xfs@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/17] block: use iomap for writes to block devices

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.