dm-raid-add-md-raid1-support-2.patch
 

Correct number of allowed "rebuild" devices in dm-raid

The number of devices that are allowed to be rebuilt in a RAID1
array is n - 1. It is not limited by 'parity_devs' like the
other RAIDs.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>

Index: linux-2.6/drivers/md/dm-raid.c
================================================== =================
--- linux-2.6.orig/drivers/md/dm-raid.c
+++ linux-2.6/drivers/md/dm-raid.c
@@ -428,8 +428,12 @@ static int parse_raid_params(struct raid
}

if (!strcasecmp(key, "rebuild")) {
- if (++rebuild_cnt > rs->raid_type->parity_devs) {
- rs->ti->error = "Too many rebuild drives given";
+ rebuild_cnt++;
+ if (((rs->raid_type->level != 1) &&
+ (rebuild_cnt > rs->raid_type->parity_devs)) ||
+ ((rs->raid_type->level == 1) &&
+ (rebuild_cnt > (rs->md.raid_disks - 1)))) {
+ rs->ti->error = "Too many rebuild devices specified for given RAID type";
return -EINVAL;
}
if (value > rs->md.raid_disks) {


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