Date: Wed, 2 Jul 2003 20:15:37 -0700 From: "David O'Brien" <obrien@freebsd.org> To: Ian Dowse <iedowse@maths.tcd.ie> Cc: freebsd-arch@freebsd.org Subject: Re: Unmounting by filesystem ID Message-ID: <20030703031537.GD18897@dragon.nuxi.com> In-Reply-To: <200306282254.aa83607@salmon.maths.tcd.ie> References: <200306282254.aa83607@salmon.maths.tcd.ie>
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On Sat, Jun 28, 2003 at 10:54:04PM +0100, Ian Dowse wrote: > The patch below adds a new mount flag MNT_BYFSID that can be used > to unmount a filesystem by specifying its filesystem ID instead of > a path. The umount utility is changed to use this mechanism by > default. This approach has a number of advantages: > > - It avoids any lookup operations that could potentially block > forever, so filesystems such as NFS can be reliably unmounted > even if the server is not responding but looking up the root node > would require an RPC (maybe to an underlying filesystem). VERY nice.
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