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Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: <3490948.1704185806@warthog.procyon.org.uk> To: Matthew Wilcox Cc: dhowells@redhat.com, Christoph Hellwig , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: bio_vec, bv_page and folios MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <5778.1704189838.1@warthog.procyon.org.uk> Content-Transfer-Encoding: quoted-printable Date: Tue, 02 Jan 2024 10:03:58 +0000 Message-ID: <5779.1704189838@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 X-Rspamd-Queue-Id: 16FAC1A001D X-Rspam-User: X-Stat-Signature: jxgfz1prmkd46iiz9ti3nuokub61c4w8 X-Rspamd-Server: rspam03 X-HE-Tag: 1704189844-430082 X-HE-Meta: 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 ApmUkqI1 zSc8jvZYEwQ4sEGYRrCaIbJ3wCbF1HyUNiSk5PAEJjTPeIfjr3ZK0I6dwMsRg8+wkXlDdVOawA/At8tdFtpsHltRtX1pyDgiCsJfSOxNpvi6U8LOv85NnDY/lZsHxHcuBfQw6blsNCEHWeSWte1NyrGBHAzd6qL+VK8lAWoPACi0Wu24P9CSIiMvR+DBlSwS8r9I5LYEEovO4cwMCjDeG9/1TlixbvqbokI9KumEC+UN7ngpEBor2srF7+uX/YY9p98pa X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Matthew Wilcox wrote: > On Tue, Jan 02, 2024 at 08:56:46AM +0000, David Howells wrote: > > Hi Christoph, Willy, > > = > > Will bv_page in struct bio_vec ever become a folio pointer rather than= I page > > pointer? I'm guessing not as it still presumably needs to be able to = point to > > non-folio pages. > = > My plan for bio_vec is that it becomes phyr -- a physical address + > length. No more page or folio reference. Interesting... What does that mean for those places that currently use bv_page as a place to stash a pointer to the page and use it to clean up t= he page later? David