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Date: Wed, 23 Nov 2011 23:00:26 +0400
From: Lev Serebryakov <lev@FreeBSD.org>
Organization: FreeBSD
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Subject: Does UFS2 send BIO_FLUSH to GEOM when update metadata (with
	softupdates)?
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Hello, Freebsd-fs.

  Does UFS2 with softupdates (without journal) issues BIO_FLUSH to
GEOM layer when it need to ensure consistency on on-disk metadata?

  Does UFS2 with SU+J issues this command?

  geom_raid5 respects this command, but when write log is enabled, it
produces tons of "Unexpected softupate inconsistency" errors on crash.
It seems, that there is no BIO_FLUSH and writes, which should be
synchronous (metadata updates) isn't :(

--=20
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>