From: David Howells <dhowells@redhat.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: dhowells@redhat.com, nickpiggin@yahoo.com.au,
nfsv4@linux-nfs.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 1/4] CacheFiles: Use the ->write() file op rather than a special kernel aop
Date: Fri, 03 Apr 2009 14:57:19 +0100 [thread overview]
Message-ID: <11023.1238767039@redhat.com> (raw)
In-Reply-To: <20090403134927.GA31907@infradead.org>
Christoph Hellwig <hch@infradead.org> wrote:
> > + if (!aops->bmap)
> > goto check_error;
>
> What are you doing using bmap? You really shouldn't call into it from
> anywhere but FIBMAP. Yes, swap currently does but it's a major pain
> in the neck and Peter has been working on a proper interface for swap
> for a while.
Checking to see whether there's a hole in the file. If there's a hole, that
represents data I need to fetch; if there isn't that represents data I have in
the cache. I don't care _where_ the data is, only whether it exists or not.
David
prev parent reply other threads:[~2009-04-03 13:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-03 9:41 [PATCH 1/4] CacheFiles: Use the ->write() file op rather than a special kernel aop David Howells
2009-04-03 9:41 ` [PATCH 2/4] CacheFiles: Revert the addition of write_one_page() David Howells
2009-04-03 13:50 ` Christoph Hellwig
2009-04-03 13:53 ` David Howells
2009-04-04 5:55 ` Nick Piggin
2009-04-03 9:41 ` [PATCH 3/4] FS-Cache: Use a radix tree to track pages being written rather than a page flag David Howells
2009-04-03 9:41 ` [PATCH 4/4] FS-Cache: Revert the addition of PG_owner_priv2/PG_fscache_write David Howells
2009-04-03 9:51 ` [PATCH 1/4] CacheFiles: Use the ->write() file op rather than a special kernel aop David Howells
2009-04-03 13:49 ` Christoph Hellwig
2009-04-03 13:57 ` David Howells [this message]
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