[Ocfs2-devel] [PATCH 3/5] ocfs2: use allocation reservations for directory data

[Joel Becker]

On Tue, Mar 16, 2010 at 11:59:12PM -0700, Mark Fasheh wrote:
> Use the reservations system for unindexed dir tree allocations. We
> don't bother with the indexed tree as reads from it are mostly random
> anyway. By default this behavior is turned off and can be turned on
> via mount option 'dir_resv'. Workloads which create many large
> directories will want to turn it on.
> 
> A future improvement will be to use a different window size for
> directory inodes. Once done, we should change the default for this
> feature to be enabled.

	Why can't we turn this on and avoid a mount option?  Sure, the
reservation holds out some space, but it will be cannibalized if
the directory doesn't grow, right?

Joel

-- 

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Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker at oracle.com
Phone: (650) 506-8127