From: Dan Magenheimer <dan.magenheimer@oracle.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: chris.mason@oracle.com, akpm@linux-foundation.org,
adilger@sun.com, tytso@mit.edu, mfasheh@suse.com,
joel.becker@oracle.com, matthew@wil.cx,
linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
ocfs2-devel@oss.oracle.com, linux-mm@kvack.org,
ngupta@vflare.org, jeremy@goop.org, JBeulich@novell.com,
kurt.hackel@oracle.com, npiggin@suse.de,
dave.mccracken@oracle.com, riel@redhat.com
Subject: RE: Cleancache [PATCH 2/7] (was Transcendent Memory): core files
Date: Mon, 24 May 2010 19:15:59 -0700 (PDT) [thread overview]
Message-ID: <c5c17e83-a21c-4360-a201-3bb865062961@default> (raw)
In-Reply-To: <1b84523f-a7df-4d6a-870f-b684bd012230@default>
> > The third one is pgoff_t; again, use sane types, _if_ you actually
> want
> > the argument #3 at all - it can be derived from struct page you are
> > passing there as well.
>=20
> I thought it best to declare the _ops so that the struct page
> is opaque to the "backend" (driver). The kernel-side ("frontend")
> defines the handle and ensures coherency, so the backend shouldn't
> be allowed to derive or muck with the three-tuple passed by the
> kernel. In the existing (Xen tmem) driver, the only operation
> performed on the struct page parameter is page_to_pfn(). OTOH,
> I could go one step further and pass a pfn_t instead of a
> struct page, since it is really only the physical page frame that
> the backend needs to know about and (synchronously) read/write from/to.
>=20
> Thoughts?
Silly me. pfn_t is a Xen/KVM type not otherwise used in the
kernel AFAICT. Please ignore...
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next prev parent reply other threads:[~2010-05-25 2:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100422132809.GA27302@ca-server1.us.oracle.com>
2010-05-14 23:18 ` Cleancache [PATCH 2/7] (was Transcendent Memory): core files Al Viro
2010-05-24 20:02 ` Dan Magenheimer
2010-05-25 2:15 ` Dan Magenheimer [this message]
2010-04-22 13:28 Dan Magenheimer
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