From 16e2c85922848adb1c21a46a6cc23846ef94b951 Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Thu, 23 Jan 2014 07:40:58 +0100
Subject: Enable RAID root system.

Quoting /usr/share/doc/cryptsetup/README.keyctl :

    The current state for dm-crypt in Linux is that it is single threaded, thus
    every dm-crypt mapping only uses a single core for crypto operations.  To
    use the full power of your many-core processor it is thus necessary to
    split the dm-crypt device. For Linux software raid arrays the easiest
    segmentation is to just put the dm-crypt layer below the software raid
    layer.

However, this seems no longer true since 2.6.38, cf.

  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=714806
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c029772125594e31eb1a5ad9e0913724ed9891f2
  http://kernelnewbies.org/Linux_2_6_38#head-49f5f735853f8cc7c4d89e5c266fe07316b49f4c

Therefore encrypting the array (instead of assembling an array of encrypted
disks) shouldn't cause a performance cost. Also, it makes the ramdisk much
easier to configure :-)
---
 src/fripost-partman-udeb/base.sh | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src')

diff --git a/src/fripost-partman-udeb/base.sh b/src/fripost-partman-udeb/base.sh
index b6770f8..976cfb6 100644
--- a/src/fripost-partman-udeb/base.sh
+++ b/src/fripost-partman-udeb/base.sh
@@ -586,3 +586,19 @@ getIPv4() {
     $ip -4 address show dev "$if" scope global \
     | sed -nr '/^\s+inet\s([[:xdigit:].:]{3,39}).*/ {s//\1/p;q}'
 }
+
+
+
+##############################################################################
+# Remove a partition from a device
+#
+# Usage: fripost_rmpart device partition
+
+fripost_rmpart () {
+    local device="$1" part="$2"
+    n=$( /sbin/parted -sm "$device" p
+       | sed -nr "/^[0-9].*:$part:[^:]*;$/ s/:.*//p" )
+    [ "$n" ] || return
+    log "Removing partition $n ($part) from $device"
+    /sbin/parted -sm "$device" rm "$n"
+}
-- 
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