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lvchange/vgchange/lvconvert: prevent raid4 creation/activation/conversion on non-supporting raid targets

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Check for dm-raid target version with non-standard raid4 mapping expecting the dedicated
parity device in the last rather than the first slot and prohibit to create, activate or
convert to such LVs from striped/raid0* or vice-versa in order to avoid data corruption.

Add related tests to lvconvert-raid-takeover.sh

Resolves: rhbz1388962
This commit is contained in:
Heinz Mauelshagen
2016-10-27 11:38:16 +02:00
parent e84f527cd3
commit ff05ed7afd
9 changed files with 97 additions and 5 deletions
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10
lib/raid/raid.c
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@@ -1,5 +1,5 @@
/*
* Copyright (C) 2011-2013 Red Hat, Inc. All rights reserved.
* Copyright (C) 2011-2016 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
@@ -366,7 +366,7 @@ static int _raid_target_present(struct cmd_context *cmd,
static int _raid_checked = 0;
static int _raid_present = 0;
static int _raid_attrs = 0;
static unsigned _raid_attrs = 0;
uint32_t maj, min, patchlevel;
unsigned i;
@@ -389,6 +389,12 @@ static int _raid_target_present(struct cmd_context *cmd,
else
log_very_verbose("Target raid does not support %s.",
_features[i].feature);
if (!(maj == 1 && (min == 8 || (min == 9 && patchlevel == 0))))
_raid_attrs |= RAID_FEATURE_RAID4;
else
log_very_verbose("Target raid does not support %s.",
SEG_TYPE_NAME_RAID4);
}
if (attributes)