Subject: Re: problems unmounting an apparently non-busy filesystem
To: NetBSD-current Discussion List <current-users@NetBSD.ORG>
From: Greg A. Woods <firstname.lastname@example.org>
Date: 04/09/2001 17:36:20
[ On , April 9, 2001 at 13:20:23 (-0700), Chris G. Demetriou wrote: ]
> Subject: Re: problems unmounting an apparently non-busy filesystem
> email@example.com (Greg A. Woods) writes:
> > [ On , April 9, 2001 at 13:06:40 (-0700), Chris G. Demetriou wrote: ]
> > > Subject: Re: problems unmounting an apparently non-busy filesystem
> > >
> > > For things like this, i often find that a culprit is a device alias.
> > Indeed there's been a full /altroot/dev directory on that partition, however
> however what? 8-)
nothing's supposed to be using that directory.... :-)
> usually, when i recognize the symptoms (basically, a vnd that i just
> created and populated has a busy file system when i bloody well _know_
> that it shouldn't be busy), i just umount -f the file system.
> "pstat -v" may help.
Ah ha! I hadn't used "pstat -v" in some time and forgot that it would
sort by device:
*** MOUNT ffs /dev/sd1a on /altroot (local)
ADDR TYP VFLAG USE HOLD TAG FILEID IFLAG RDEV|SZ
d0a8a380 dir R 0 1 1 2 - 512
d0ab56f4 non O 1 0 21
d0be2ac8 reg - 4 0 1 61969 - 445249
d0be2180 reg - 4 0 1 62294 - 8538
d0a2a990 reg - 4 0 1 64801 - 53248
Now silly me I've done an "rm -rf *" in there already because the reason
I'd wanted to unmount it was to do a newfs, so now I can't find those
inode numbers any more....
However the use count of '4' makes it sound suspiciously like one of the
NFS processes still has some reference even though I've "un-exported"
the filesystem and restarted mountd.
I guess I'll just have to reboot to see if they stay away.... :-)
(or if anything really was legitimately using it)
(but not right away.... other things to do first....)
Greg A. Woods
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