linux-kernel - Re: [PATCH v3 2/4] iov_iter: Add a function to extract a page list from an iterator

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Date:   Tue, 06 Dec 2022 18:35:37 +0000
From:   David Howells <dhowells@...hat.com>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Christoph Hellwig <hch@...radead.org>,
        Jeff Layton <jlayton@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] iov_iter: Add a function to extract a page list from an iterator

Logan Gunthorpe <logang@...tatee.com> wrote:

> If this is going to be a general replacement for iov_iter_get_pages()
> it's going to need to pass through gup_flags. My recent patchset added
> versions with these and I think it should be in during the next merge
> cycle. [1]

Cool.  Note that the current iov_iter_get_pages2() is broken, which is why Al
wanted a replacement.  It should not be taking a ref on the pages in an
XARRAY, BVEC or PIPE - and it should be pinning rather than getting a ref on
pages in IOVEC or UBUF if the buffer is being read into.  I'm guessing that
your changes move the latter decision to the caller?

David