linux-kernel - Re: [PATCH v8 07/10] block: Switch to pinning pages.

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Message-ID: <874829.1674571671@warthog.procyon.org.uk>
Date:   Tue, 24 Jan 2023 14:47:51 +0000
From:   David Howells <dhowells@...hat.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        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, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v8 07/10] block: Switch to pinning pages.

David Hildenbrand <david@...hat.com> wrote:

> > +static inline void bio_set_cleanup_mode(struct bio *bio, struct iov_iter *iter)
> > +{
> > +	unsigned int cleanup_mode = iov_iter_extract_mode(iter);
> > +
> > +	if (cleanup_mode & FOLL_GET)
> > +		bio_set_flag(bio, BIO_PAGE_REFFED);
> > +	if (cleanup_mode & FOLL_PIN)
> > +		bio_set_flag(bio, BIO_PAGE_PINNED);
> 
> Can FOLL_GET ever happen?

Yes - unless patches 8 and 9 are merged.  I had them as one, but Christoph
split them up.

David