linux-kernel - Re: [PATCH v8 00/10] iov_iter: Improve page extraction (pin or just list)

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Message-ID: <Y8/eAEfzOICZ+PSo@infradead.org>
Date:   Tue, 24 Jan 2023 05:32:48 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        David Howells <dhowells@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 00/10] iov_iter: Improve page extraction (pin or just
 list)

On Tue, Jan 24, 2023 at 02:22:36PM +0100, David Hildenbrand wrote:
> > Note that while these series coverts the two most commonly used
> > O_DIRECT implementations, there are various others ones that do not
> > pin the pages yet.
> 
> Thanks for the info ... I assume these are then for other filesystems,
> right? (such that we could adjust the tests to exercise these as well)

Yes.  There's the fs/direct-io.c code still used by a few block based
file systems, and then all the not block based file systems as well
(e.g. NFS, cifs).

> ... do we have a list (or is it easy to make one)? :)

fs/direct-io.c is easy, just grep for blockdev_direct_IO.

The others are more complicated to find, but a grep for
iov_iter_get_pages2 and iov_iter_get_pages_alloc2 in fs/ should be a
good approximation.