[PATCH v2] xfs: improve xfs_iext_destroy() by freeing extent indirection array directly

[Dave Chinner]

On Tue, Sep 24, 2013 at 10:06:03PM +0800, Jeff Liu wrote:
> From: Jie Liu <jeff.liu at oracle.com>
> 
> To free the incore file extents stores at an indirection array, we
> call the common routine xfs_iext_irec_remove() to remove a record
> from the array one at a time in reverse order, which will resize an
> extent indirection array repeatedly according to the array size.
> 
> This is inefficient for dealing with a file with thousands of incore
> extent records stores at indirection arrays.
> 
> This patch improve this kind of things by freeing the extent records
> from the indirection array directly so that we can get benefits for
> reducing the overhead of alloc/free buffers which is depending on the
> number of extents records.
> 
> Signed-off-by: Jie Liu <jeff.liu at oracle.com>

Looks good.

Reviewed-by: Dave Chinner <dchinner at redhat.com>
-- 
Dave Chinner
david at fromorbit.com