From owner-freebsd-hackers  Thu Oct 22 16:40:17 1998
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To: Don Lewis <Don.Lewis@tsc.tdk.com>
Subject: Re: softupdates and sync 
cc: dag-erli@ifi.uio.no, hackers@FreeBSD.ORG
In-reply-to: Your message of "Thu, 22 Oct 1998 15:37:38 PDT."
             <199810222237.PAA17114@salsa.gv.tsc.tdk.com> 
Date: Thu, 22 Oct 1998 15:54:18 -0700
From: Kirk McKusick <mckusick@McKusick.COM>
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	From: Don Lewis <Don.Lewis@tsc.tdk.com>
	Date: Thu, 22 Oct 1998 15:37:38 -0700
	In-Reply-To: Kirk McKusick <mckusick@McKusick.COM>
	       "Re: softupdates and sync" (Oct 19,  8:42pm)
	To: Kirk McKusick <mckusick@McKusick.COM>, dag-erli@ifi.uio.no
	Subject: Re: softupdates and sync
	Cc: hackers@FreeBSD.ORG

	I wonder if this is related to:

	On Oct 14,  5:06pm, Dag-Erling C. =?iso-8859-1?Q?Sm=F8rgrav?= wrote:
	} Subject: SoftUpdates anomaly: what happens when you 'mount -u -o ro /usr'?

	...

Down-grading to read-only goes through the same process as unmounting.
In particular it calls softdep_flushfiles which sync's the filesystem
and flushes all the related background jobs from the work queue. If the
deleted files had been on the work queue, they would have been flushed.
That implies to me that they had not gotten to the work queue. Something
very fishy is going on here, because this behavior does not show up in
any of the other soft updates ports. My guess is that if you remove a
bunch of files, then downgrade the filesystem, and finally run fsck -f
(or whatever your option is to force it to run in the face of the clean
flag being set), that you will have lost files. You will likely get the
same effect if you do an unmount rather than a downgrade.

	Kirk McKusick

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