[PATCH 22/30] db: add a special directory buffer verifier

[Christoph Hellwig]

On Wed, Oct 30, 2013 at 03:31:13PM +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner at redhat.com>
> 
> Because we only have a single directory type that is used for all
> the different buffer types, we need to provide a special verifier
> for the read code. That verifier needs to know all the directory
> types and when it find one it knows about, switch to the correct
> verifier and call it.
> 
> We already do this for certain readahead cases in the directory
> code, so there is precedence for this. If we don't find a magic
> number we recognise, the verifier fails...
> 
> Signed-off-by: Dave Chinner <dchinner at redhat.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch at lst.de>