From owner-freebsd-bugs  Sun Oct 25 06:52:06 1998
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To: Love <lha@s3.kth.se>
Cc: freebsd-fs@FreeBSD.ORG, freebsd-bugs@FreeBSD.ORG, kom-arla@stacken.kth.se
Subject: Re: deadfs in FreeBSD 3.0/current ?
References: <199810250912.JAA05540@nutcracker.e.kth.se>
From: Artur Grabowski <art@stacken.kth.se>
Date: 25 Oct 1998 15:51:52 +0100
In-Reply-To: Love's message of "Sun, 25 Oct 1998 09:12:55 GMT"
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Love <lha@s3.kth.se> writes:

> Hello
> 
> kern/vfs_subr.c:vclean() does a vp->v_flag |= VXLOCK; and after that
> "calls" VOP_LOCK().
> 
> Now when the filesystem is deadfs (we use it in arla[1]), the call
> ends up in miscfs/deadfs/dead_vnops.c:dead_lock() that calls
> chkvnlock(). Now chkvnlock() sleeps when VXLOCK is set.

As a horrible workaround in OpenBSD I noted that LK_DRAIN is set in the
VOP_LOCK call in vclean. (The code is not checked in, our tree is locked).
And when the LK_DRAIN is set I don't do the chkvnlock().

//art

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