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btrfs trim erases bootloader area

From: Andrei Borzenkov
Subject: btrfs trim erases bootloader area
Date: Thu, 7 Jan 2016 22:11:43 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0

As discussed on opensuse-factory list, running fstrim on btrfs erases
bootloader area, rendering system unbootable. See

and follow-ups that demonstrate that beginning of device gets zeroed out.

Not sure what we can do, but from GRUB side I can only see disabling
embedding support on btrfs entirely.

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