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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