From: Zhao Lei <zhaolei@cn.fujitsu.com>
Date: Thu, 13 Nov 2014 03:45:40 +0000 (+0800)
Subject: Btrfs: remove unnecessary code of stripe_index assignment in __btrfs_map_block
X-Git-Tag: firefly_0821_release~176^2~2414^2~18^2~8
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6de65650758e819d3dfdc621010dcd6117e8d186;p=firefly-linux-kernel-4.4.55.git

Btrfs: remove unnecessary code of stripe_index assignment in __btrfs_map_block

stripe_index's value was set again in latter line:
stripe_index = 0;

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
---

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 20160aa44655..6f5b302a08cf 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5166,9 +5166,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
 
 			/* push stripe_nr back to the start of the full stripe */
 			stripe_nr = raid56_full_stripe_start;
-			do_div(stripe_nr, stripe_len);
-
-			stripe_index = do_div(stripe_nr, nr_data_stripes(map));
+			do_div(stripe_nr, stripe_len * nr_data_stripes(map));
 
 			/* RAID[56] write or recovery. Return all stripes */
 			num_stripes = map->num_stripes;