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Date:      Fri, 26 Sep 1997 17:33:00 +0900
From:      KATO Takenori <kato@migmatite.eps.nagoya-u.ac.jp>
To:        bde@zeta.org.au
Cc:        current@FreeBSD.ORG
Subject:   Re: Daily SNAPshots at current.freebsd.org shut down for now.
Message-ID:  <199709260833.RAA08732@gneiss.eps.nagoya-u.ac.jp>
In-Reply-To: Your message of "Fri, 26 Sep 1997 16:40:38 %2B1000"
References:  <199709260640.QAA23500@godzilla.zeta.org.au>

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> It doesn't yet.  It could look at a new flag (vp->v_flag & VNOCLUSTER)
> where vp is the vnode for the mount point.  The flag should be set in
> vnopen().  This seems to require using bdevvp() to find the vnode.

Each fs layer (e.g., ufs) can know both (1) special device requests to 
disable clustering I/O via bdevsw, and (2) the filesystem supports
clustering I/O or not.


> Right, except separate MNT_NOCLUSTER{READ,WRITE} flags are required to
> give the same functionality.

There is another reson separted options are required: if only cluster
write is unsafe, there is no reason disabling cluster read.


This is gzipped patch for 3.0-current:

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`
end
---------- END ----------

----
KATO Takenori <kato@ganko.eps.nagoya-u.ac.jp>
Dept. Earth Planet. Sci., Nagoya Univ.,  Nagoya, 464-01, Japan
PGP public key: finger kato@eclogite.eps.nagoya-u.ac.jp
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