Date: Fri, 26 Sep 1997 16:40:38 +1000 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, kato@migmatite.eps.nagoya-u.ac.jp Cc: current@FreeBSD.ORG Subject: Re: Daily SNAPshots at current.freebsd.org shut down for now. Message-ID: <199709260640.QAA23500@godzilla.zeta.org.au>
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>> clustering is 2 too many for a production system :-) (non-clustering for
>> /dev/vn must be forced independently of any mount options and sysctls,
>> except possibly for debugging).
>
>How does mount() in vfs_syscall.c know special device is /dev/vn?
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.
>When mount() can know specical device is /dev/vn, then
>
> if (special device is /dev/vn)
> mp->mnt_flag |= MNT_NOCLUSTER;
>
>works, and doclusterread and doclusterwrite can be eliminated.
Right, except separate MNT_NOCLUSTER{READ,WRITE} flags are required to
give the same functionality.
Bruce
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