linux-kernel - Re: [PATCH 1/9]: introduce radix_tree_gang_lookup

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Date:	Mon, 26 Nov 2007 10:17:24 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	David Chinner <dgc@....com>
Cc:	xfs-oss <xfs@....sgi.com>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/9]: introduce radix_tree_gang_lookup_range

On Thursday 22 November 2007 11:32, David Chinner wrote:
> Introduce radix_tree_gang_lookup_range()
>
> The inode clustering in XFS requires a gang lookup on the radix tree to
> find all the inodes in the cluster.  The gang lookup has to set the
> maximum items to that of a fully populated cluster so we get all the
> inodes in the cluster, but we only populate the radix tree sparsely (on
> demand).
>
> As a result, the gang lookup can search way, way past the index of end
> of the cluster because it is looking for a fixed number of entries to
> return.
>
> We know we want to terminate the search at either a specific index or a
> maximum number of items, so we need to add a "last_index" parameter to
> the lookup.

Yeah, this fixes one downside of the gang lookup API. For consistency
it would be nice to do this for the tag lookup API as well...


> Furthermore, the existing radix_tree_gang_lookup() can use this same
> function if we define a RADIX_TREE_MAX_INDEX value so the search is not
> limited by the last_index.

Nit: should just define it to be ULONG_MAX.

>
> Signed-off-by: Dave Chinner <dgc@....com>

Otherwise, Acked-by: Nick Piggin <npiggin@...e.de>
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