[PATCH 3/5] xfs: exact busy extent tracking

[Alex Elder]

On Mon, 2011-03-28 at 17:06 -0400, Christoph Hellwig wrote:
> Update the extent tree in case we have to reuse a busy extent, so that it
> always is kept uptodate.  This is done by replacing the busy list searches
> with a new xfs_alloc_busy_reuse helper, which updates the busy extent tree
> in case of a reuse.   Also replace setting transactions to sync with forcing
> the log out in case we found a busy extent to reuse.  This makes the code a
> lot more simple, and is required for discard support later on.  While it
> will cause performance regressios with just this patch applied, the impact
> is more than mitigated by the next patch in the series.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Looks good.  xfs_alloc_busy_update_extent() is a better name
than xfs_alloc_buisy_try_reuse() was.

Reviewed-by: Alex Elder <aelder at sgi.com>