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From 2167de78aab599e7a7a8d057ef04bf18527bc129 Mon Sep 17 00:00:00 2001
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From: Pawel Baldysiak <pawel.baldysiak@intel.com>
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Date: Thu, 6 Mar 2014 15:51:44 +0100
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Subject: [PATCH] mdmon@.service: Change type of process start-up to 'forking'.
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Mdadm does not wait enough time when mdmon is started by systemd.
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It causes various problems with behaviour of a RAID volume with external metadata.
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For example: mdmon does not update a value of checkpoint during migration
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and second RAID5 volume is read-only after reboot done during
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container reshape (both problems occur with IMSM matadata).
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If a type of process start-up is changed to 'forking', systemctl will
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wait until mdmon (parent) process exits after calling fork.
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This way mdmon will always be fully initialized after start_mdmon
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and these problems will not occur.
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In this case it is recommended to add a path to PIDFile, so that systemd
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does not have to guess a PID of the mdmon process.
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Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
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Reviewed-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
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Reviewed-by: Lukasz Dorau <lukasz.dorau@intel.com>
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Signed-off-by: NeilBrown <neilb@suse.de>
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---
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systemd/mdmon@.service | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/systemd/mdmon@.service b/systemd/mdmon@.service
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index 5520cd0..304b26e 100644
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--- a/systemd/mdmon@.service
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+++ b/systemd/mdmon@.service
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@@ -11,7 +11,10 @@
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Before=initrd-switch-root.target
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[Service]
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-ExecStart=/sbin/mdmon --foreground %I
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+Environment=IMSM_NO_PLATFORM=1
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+ExecStart=/sbin/mdmon %I
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+Type=forking
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+PIDFile=/run/mdadm/%I.pid
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StandardInput=null
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StandardOutput=null
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StandardError=null
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