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Re: kern/38990: Unmounting a disk fails the first time
The following reply was made to PR kern/38990; it has been noted by GNATS.
From: David Holland <dholland-bugs%netbsd.org@localhost>
To: Christos Zoulas <christos%zoulas.com@localhost>
Cc: David Holland <dholland-bugs%netbsd.org@localhost>,
Subject: Re: kern/38990: Unmounting a disk fails the first time
Date: Sat, 21 Jun 2008 23:23:14 +0000
On Sat, Jun 21, 2008 at 05:38:48PM -0400, Christos Zoulas wrote:
> | > 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)?
> It is worth fixing the syscall :-)
Simplifying the locking isn't going to happen before branching.
Afterwards, though... maybe.
I was thinking that putting in a temporary hack of the form "sync();
sleep(1); retry" is a lot easier at userlevel, that's all.
David A. Holland
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