From: NeilBrown <neilb@suse.de>
Date: Fri, 25 Sep 2009 07:23:33 +0000 (+1000)
Subject: Fix raid6 error recovery in 'restripe' code.
X-Git-Tag: mdadm-3.1~22
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e38cc2d87b319572fe7ff08be5657f563b1ef9e7;p=thirdparty%2Fmdadm.git

Fix raid6 error recovery in 'restripe' code.

Thanks to Matthias Urlichs for discovering and reporting this.

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

diff --git a/restripe.c b/restripe.c
index 9a70cd09..33548e91 100644
--- a/restripe.c
+++ b/restripe.c
@@ -477,8 +477,8 @@ int save_stripes(int *source, unsigned long long *offsets,
 				for (i = 0; i < data_disks; i++)
 					bufs[i] = (uint8_t*)buf + chunk_size * ((qdisk+1+i) % raid_disks);
 
-				fdisk[0] = (qdisk + 1 + fdisk[0]) * raid_disks;
-				fdisk[1] = (qdisk + 1 + fdisk[1]) * raid_disks;
+				fdisk[0] = (qdisk + 1 + fdisk[0]) % raid_disks;
+				fdisk[1] = (qdisk + 1 + fdisk[1]) % raid_disks;
 				syndrome_disks = data_disks;
 			}
 			bufs[syndrome_disks] = (uint8_t*)buf + chunk_size * disk;