From: NeilBrown <neilb@suse.de>
Date: Tue, 3 May 2011 05:57:34 +0000 (+1000)
Subject: FORMAT CHANGE use crc32 for cluster head rather than toy checksum
X-Git-Url: http://git.neil.brown.name/?a=commitdiff_plain;h=56906eb2f8639dc0a83c8b89fcc2b4ef3bb26ff1;p=lafs-utils.git

FORMAT CHANGE use crc32 for cluster head rather than toy checksum

Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/lib/lafs_cluster_flush.c b/lib/lafs_cluster_flush.c
index 63d34f0..ac31718 100644
--- a/lib/lafs_cluster_flush.c
+++ b/lib/lafs_cluster_flush.c
@@ -224,15 +224,10 @@ static void cluster_incdesc(struct lafs_cluster *wc, struct descriptor *desc_sta
 int lafs_calc_cluster_csum(struct cluster_head *head)
 {
 	unsigned int oldcsum = head->checksum;
-	unsigned long long newcsum = 0;
 	unsigned long csum;
-	int i;
-	unsigned int *superc = (unsigned int *) head;
-	head->checksum = 0;
 
-	for (i = 0; i < __le16_to_cpu(head->Hlength)/4; i++)
-		newcsum += __le32_to_cpu(superc[i]);
-	csum = (newcsum & 0xffffffff) + (newcsum>>32);
+	head->checksum = 0;
+	csum = crc32(0, (uint32_t *)head, __le16_to_cpu(head->Hlength));
 	head->checksum = oldcsum;
 	return __cpu_to_le32(csum);
 }