linux-kernel - Re: [PATCH v2 3/3] bio: convert get_user_pages_fast() --> pin_user_pages

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Message-ID: <20200829150223.GC12470@infradead.org>
Date:   Sat, 29 Aug 2020 16:02:23 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Ilya Dryomov <idryomov@...il.com>,
        Jens Axboe <axboe@...nel.dk>, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] bio: convert get_user_pages_fast() -->
 pin_user_pages_fast()

> -	size = iov_iter_get_pages(iter, pages, LONG_MAX, nr_pages, &offset);
> +	size = iov_iter_pin_user_pages(iter, pages, LONG_MAX, nr_pages, &offset);

This is really a comment to the previous patch, but I only spotted it
here:  I think the right name is iov_iter_pin_pages, as bvec, kvec and
pipe aren't usually user pages.  Same as iov_iter_get_pages vs
get_user_pages.  Same for the _alloc variant.

> + * here on.  It will run one unpin_user_page() against each page
> + * and will run one bio_put() against the BIO.

Nit: the ant and the will still fit on the previous line.