From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Fri, 30 Sep 2016 05:04:57 +0000 (+0800)
Subject: btrfs-progs: volumes: Use new raid5_gen_result to calculate raid5 parity
X-Git-Tag: upstream/4.16.1~956
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c00278a9e8c72583105a29409809d43ca425dd00;p=platform%2Fupstream%2Fbtrfs-progs.git

btrfs-progs: volumes: Use new raid5_gen_result to calculate raid5 parity

Use thew raid5_gen_result() function to calculate raid5 parity.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/volumes.c b/volumes.c
index e39f21e..5d770e5 100644
--- a/volumes.c
+++ b/volumes.c
@@ -2136,7 +2136,6 @@ int write_raid56_with_parity(struct btrfs_fs_info *info,
 {
 	struct extent_buffer **ebs, *p_eb = NULL, *q_eb = NULL;
 	int i;
-	int j;
 	int ret;
 	int alloc_size = eb->len;
 	void **pointers;
@@ -2194,18 +2193,12 @@ int write_raid56_with_parity(struct btrfs_fs_info *info,
 		raid6_gen_syndrome(multi->num_stripes, stripe_len, pointers);
 	} else {
 		ebs[multi->num_stripes - 1] = p_eb;
-		memcpy(p_eb->data, ebs[0]->data, stripe_len);
-		for (j = 1; j < multi->num_stripes - 1; j++) {
-			for (i = 0; i < stripe_len; i += sizeof(u64)) {
-				u64 p_eb_data;
-				u64 ebs_data;
-
-				p_eb_data = get_unaligned_64(p_eb->data + i);
-				ebs_data = get_unaligned_64(ebs[j]->data + i);
-				p_eb_data ^= ebs_data;
-				put_unaligned_64(p_eb_data, p_eb->data + i);
-			}
-		}
+		for (i = 0; i < multi->num_stripes; i++)
+			pointers[i] = ebs[i]->data;
+		ret = raid5_gen_result(multi->num_stripes, stripe_len,
+				       multi->num_stripes - 1, pointers);
+		if (ret < 0)
+			goto out_free_split;
 	}
 
 	for (i = 0; i < multi->num_stripes; i++) {