Re: kern/38990: Unmounting a disk fails the first time

[David Holland <dholland-bugs%netbsd.org@localhost>]

On Fri, Jun 20, 2008 at 09:30:02AM +0000, Andrew Doran wrote:
 >>     $ sudo mount -t ffs /dev/sd0e /mnt
 >>     $ rsync /something/ /mnt/something/ # a large directory tree
 >>     $ sudo umount /mnt
 >>     umount: /mnt: Device busy
 >>     $ sync ; sleep 1 ; sync ; sleep 1 ; sync
 >>     $ sudo umount /mnt
 >>     [ no error ]
 >  
 >  It's due to the kernel's 'vrele' thread. Sometimes we have to defer
 >  VOP_INACTIVE because of the horrible locking requirements. It always
 >  gets done for layered file systems. The delay is about one second.

Is it worth installing a workaround into umount(8)?

-- 
David A. Holland
dholland%netbsd.org@localhost