linux-kernel - Re: [PATCH] 9p/virtio: restrict page pinning to user_backed

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Message-ID: <814008.1766143582@warthog.procyon.org.uk>
Date: Fri, 19 Dec 2025 11:26:22 +0000
From: David Howells <dhowells@...hat.com>
To: asmadeus@...ewreck.org
Cc: dhowells@...hat.com, Christoph Hellwig <hch@...radead.org>,
    Eric Van Hensbergen <ericvh@...nel.org>,
    Latchesar Ionkov <lucho@...kov.net>,
    Christian Schoenebeck <linux_oss@...debyte.com>,
    v9fs@...ts.linux.dev, linux-kernel@...r.kernel.org,
    Matthew Wilcox <willy@...radead.org>, linux-fsdevel@...r.kernel.org,
    Chris Arges <carges@...udflare.com>
Subject: Re: [PATCH] 9p/virtio: restrict page pinning to user_backed_iter() iovec

asmadeus@...ewreck.org wrote:

> FWIW, the comment at the top of extract_iter_to_sg() says:
> > The iov_iter_extract_mode() function should be used to query how cleanup
> but I couldn't find any such function (even back when this comment was
> added to netfs code in 2023...), the two copies of this comment probably
> could use updating... David?

Ah, the function got renamed to iov_iter_extract_will_pin() instead.  I need
to fix the comment.

David