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Date:   Mon, 29 Jul 2019 16:57:21 -0400
From:   Jerome Glisse <jglisse@redhat.com>
To:     Christoph Hellwig <hch@infradead.org>
Cc:     john.hubbard@gmail.com, Andrew Morton <akpm@linux-foundation.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Anna Schumaker <anna.schumaker@netapp.com>,
        "David S . Miller" <davem@davemloft.net>,
        Dominique Martinet <asmadeus@codewreck.org>,
        Eric Van Hensbergen <ericvh@gmail.com>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Jason Wang <jasowang@redhat.com>, Jens Axboe <axboe@kernel.dk>,
        Latchesar Ionkov <lucho@ionkov.net>,
        "Michael S . Tsirkin" <mst@redhat.com>,
        Miklos Szeredi <miklos@szeredi.hu>,
        Trond Myklebust <trond.myklebust@hammerspace.com>,
        Christoph Hellwig <hch@lst.de>,
        Matthew Wilcox <willy@infradead.org>, linux-mm@kvack.org,
        LKML <linux-kernel@vger.kernel.org>, ceph-devel@vger.kernel.org,
        kvm@vger.kernel.org, linux-block@vger.kernel.org,
        linux-cifs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
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        netdev@vger.kernel.org, samba-technical@lists.samba.org,
        v9fs-developer@lists.sourceforge.net,
        virtualization@lists.linux-foundation.org,
        John Hubbard <jhubbard@nvidia.com>,
        Minwoo Im <minwoo.im.dev@gmail.com>
Subject: Re: [PATCH 03/12] block: bio_release_pages: use flags arg instead of
 bool
Message-ID: <20190729205721.GB3760@redhat.com>
References: <20190724042518.14363-1-jhubbard@nvidia.com>
 <20190724042518.14363-4-jhubbard@nvidia.com>
 <20190724053053.GA18330@infradead.org>
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On Tue, Jul 23, 2019 at 10:30:53PM -0700, Christoph Hellwig wrote:
> On Tue, Jul 23, 2019 at 09:25:09PM -0700, john.hubbard@gmail.com wrote:
> > From: John Hubbard <jhubbard@nvidia.com>
> > 
> > In commit d241a95f3514 ("block: optionally mark pages dirty in
> > bio_release_pages"), new "bool mark_dirty" argument was added to
> > bio_release_pages.
> > 
> > In upcoming work, another bool argument (to indicate that the pages came
> > from get_user_pages) is going to be added. That's one bool too many,
> > because it's not desirable have calls of the form:
> 
> All pages releases by bio_release_pages should come from
> get_get_user_pages, so I don't really see the point here.

No they do not all comes from GUP for see various callers
of bio_check_pages_dirty() for instance iomap_dio_zero()

I have carefully tracked down all this and i did not do
anyconvertion just for the fun of it :)

Cheers,
J?r?me