[PATCH v2 1/3] xfs: use b_maps[] for discontiguous buffers

[Dave Chinner]

On Wed, Nov 28, 2012 at 04:23:10PM -0600, Mark Tinguely wrote:
> Commits starting at 77c1a08 introduced a multiple segment support
> to xfs_buf. xfs_trans_buf_item_match() could not find a multi-segment
> buffer in the transaction because it was looking at the single segment
> block number rather than the multi-segment b_maps[0].bm.bn. This
> results on a recursive buffer lock that can never be satisfied.
> 
> This patch:
>  1) Changed the remaining b_map accesses to be b_maps[0] accesses.
>  2) Renames the single segment b_map structure to __b_map to avoid
>     future confusion.
> 
> Signed-off-by: Mark Tinguely <tinguely at sgi.com>

Looks good.

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