svn commit: r222466 - head/sbin/umount

[Kostik Belousov]

On Mon, May 30, 2011 at 01:48:53PM +0100, Robert Watson wrote:
> On Sun, 29 May 2011, Rick Macklem wrote:
> 
> > Modify the umount(8) command so that it doesn't do
> > a sync(2) syscall before unmount(2) for the "-f" case.
> > This avoids a forced dismount from getting stuck for
> > an NFS mountpoint in sync() when the server is not
> > responsive. With this commit, forced dismounts should
> > normally work for the NFS clients, but can take up to
> > about 1minute to complete.
> 
> I'm actually a bit confused about why umount(8) calls sync(2) at all: 
> surely it's the responsibility of the file system, rather than the userland 
> tool, to ensure consistency subject to file system configuration and 
> unmount-time flags?
This call is from the same department as triple-sync before reboot, IMO.
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