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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Don Zickus <dzickus@redhat.com>
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Date: Wed, 22 Jul 2015 13:59:55 -0400
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Subject: [PATCH] ppc64le sync mkconfig to disk (#1212114)
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If creating a new grub2 entry using grub2-mkconfig, the entry is not
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immediately sync'd to disk. If a crash happens before the writeback,
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the subsequent reboot fails because the grub2.cfg is corrupted.
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Address this by forcing all the changes (mainly the fs meta data) to disk
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before finishing the grub2 conf changes.
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Tested by 'grub2-mkconfig -o /etc/grub22.cfg; echo c > /proc/sysrq-trigger'.
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Before, the machine would panic and on reboot be stuck without a grub.cfg
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to read. After, works as expected.
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Resolves: rhbz#1212114
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---
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util/grub-mkconfig.in | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in
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index e029d0d5ea9..cf315e241f6 100644
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--- a/util/grub-mkconfig.in
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+++ b/util/grub-mkconfig.in
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@@ -290,3 +290,12 @@ fi
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gettext "done" >&2
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echo >&2
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+
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+# make sure changes make it to the disk.
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+# if /boot is a mountpoint, force the meta data on disk
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+# to by-pass writeback delay.
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+# PPC64LE-only to deal with Petitboot issues
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+ARCH=$(uname -m)
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+if [ "${ARCH}" = "ppc64le" ]; then
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+ sync && mountpoint -q /boot &&fsfreeze -f /boot && fsfreeze -u /boot
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+fi
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