File 0216-imsm-correct-num_data_stripes-in-metadata-map-for-mi.patch of Package mdadm.7989

From 4a353e6ec48e35437b27978add6cd2cd015f2cfe Mon Sep 17 00:00:00 2001
From: Roman Sobanski <roman.sobanski@intel.com>
Date: Fri, 8 Jun 2018 12:34:18 +0200
Subject: [PATCH] imsm: correct num_data_stripes in metadata map for migration
Git-commit: 4a353e6ec48e35437b27978add6cd2cd015f2cfe
Patch-mainline: mdadm-4.0+
References: bsc#1101110

When migrating an array from R0 to R10 num_data_stripes in metadata map
will not be updated. Update it to allow correct migration process.
Changes in R10 to R0 migration for clarity of code.

Signed-off-by: Roman Sobanski <roman.sobanski@intel.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>
Signed-off-by: Coly Li <colyli@suse.de>
---
 super-intel.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/super-intel.c b/super-intel.c
index a01be13..f011a31 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -9543,12 +9543,6 @@ static int apply_takeover_update(struct imsm_update_takeover *u,
 	if (u->direction == R10_TO_R0) {
 		unsigned long long num_data_stripes;
 
-		map->num_domains = 1;
-		num_data_stripes = imsm_dev_size(dev) / 2;
-		num_data_stripes /= map->blocks_per_strip;
-		num_data_stripes /= map->num_domains;
-		set_num_data_stripes(map, num_data_stripes);
-
 		/* Number of failed disks must be half of initial disk number */
 		if (imsm_count_failed(super, dev, MAP_0) !=
 				(map->num_members / 2))
@@ -9574,10 +9568,15 @@ static int apply_takeover_update(struct imsm_update_takeover *u,
 		map->num_domains = 1;
 		map->raid_level = 0;
 		map->failed_disk_num = -1;
+		num_data_stripes = imsm_dev_size(dev) / 2;
+		num_data_stripes /= map->blocks_per_strip;
+		set_num_data_stripes(map, num_data_stripes);
 	}
 
 	if (u->direction == R0_TO_R10) {
 		void **space;
+		unsigned long long num_data_stripes;
+
 		/* update slots in current disk list */
 		for (dm = super->disks; dm; dm = dm->next) {
 			if (dm->index >= 0)
@@ -9615,6 +9614,11 @@ static int apply_takeover_update(struct imsm_update_takeover *u,
 		map->map_state = IMSM_T_STATE_DEGRADED;
 		map->num_domains = 2;
 		map->raid_level = 1;
+		num_data_stripes = imsm_dev_size(dev) / 2;
+		num_data_stripes /= map->blocks_per_strip;
+		num_data_stripes /= map->num_domains;
+		set_num_data_stripes(map, num_data_stripes);
+
 		/* replace dev<->dev_new */
 		dv->dev = dev_new;
 	}
-- 
2.18.0
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