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[bug #46691] grub-install always fail when installing into unpartitioned

From: Andrei Borzenkov
Subject: [bug #46691] grub-install always fail when installing into unpartitioned filesystem using blocklist
Date: Sat, 26 Dec 2015 07:54:06 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/47.0.2526.73 Chrome/47.0.2526.73 Safari/537.36

Follow-up Comment #3, bug #46691 (project grub):

> anyone opening file without O_DIRECT could grab stale data 
> when someone else writes beneath. 

That's very strong statement. It may be true, but I would like to see
reference to either kernel discussion or kernel source code.

> grub-install purges its disk cache before core.img verification,
> but this isn't effective since stale data is returned by kernel
> itself. 

GRUB also performs fsync() which should synchronize filesystem and block
device state. What you describe sounds more like broken filsystem which fails
to properly implement fsync(). Now, *that* was known and I won't mind adding
workaround for this but I want to understand what we are trying to fix.


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