From fce3bb9a1bd492793170e117c60d5718b7896af4 Mon Sep 17 00:00:00 2001
From: Li Dongyang <lidongyang@novell.com>
Date: Thu, 24 Mar 2011 10:24:26 +0000
Subject: [PATCH] Btrfs: make btrfs_map_block() return entire free extent for
 each device of RAID0/1/10/DUP

btrfs_map_block() will only return a single stripe length, but we want the
full extent be mapped to each disk when we are trimming the extent,
so we add length to btrfs_bio_stripe and fill it if we are mapping for REQ_DISCARD.

Signed-off-by: Li Dongyang <lidongyang@novell.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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