[bug #32472] GRUB2 does not flush data correctly after installing

[КоренбергМарк]

Follow-up Comment #7, bug #32472 (project grub):

> Sync is still needed
No, it's not true.

sync() will sync all data on all (including innocent) filesystems. 

So, if someone writes to another disk (suppose dropbox, email server, other
disk-heavy apps), sync() never complete, and grub hang (for the time)!

fsync() is always sufficient, even without BLKFLSBUF, but BLKFLSBUF guarantee
that data is flushed from disk hardware buffers to disk.

Never use sync() in any program. Also, sync() force kernel to allocate ALL
blocks marked for delayed allocation....

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