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Date: Thu, 02 Apr 2009 15:19:47 -0400 From: Trond Myklebust <trond.myklebust@....uio.no> To: David Howells <dhowells@...hat.com> Cc: Nick Piggin <nickpiggin@...oo.com.au>, viro@...iv.linux.org.uk, nfsv4@...ux-nfs.org, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org Subject: Re: [PATCH 06/43] FS-Cache: Recruit a couple of page flags for cache management [ver #46] On Thu, 2009-04-02 at 18:40 +0100, David Howells wrote: > Nick Piggin <nickpiggin@...oo.com.au> wrote: > > > Well in theory I still think it would be cleanest to modify buffer to > > play more nicely with it. But maybe that ends up being harder to > > distinguish the 3 cases of attached metadata on the page. I don't know, > > you haven't posted any isofs code so either way it is inappropriate to > > use up this extra page flag here. > > > > Is isofs cache worth a page flag? > > Well, isofs was something I wanted at the time. > > Besides, as I said NFS uses PG_private for its own purposes, and entangling > the two wasn't the most fun I've had. Trond didn't like it either. We use it for exactly the same purpose as everyone else: to signal that we need a callback to ->releasepage() if the VM wants to truncate the page. Trond -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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