Date: Mon, 10 Apr 2000 13:46:15 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: "David E. Cross" <crossd@cs.rpi.edu> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: NFS FHs, what are they (how are they made?) Message-ID: <200004102046.NAA27006@apollo.backplane.com> References: <200004102039.QAA32367@cs.rpi.edu>
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:I was previously under the impression that a NFS FH was basically a
:concatenation of a device # and an inode #. This was shot down earlier today.
:The problem was that a disk had failed and we where doing a replacement (the
:new disk was not identical to the old, it was substantially larger). I
:proceeded to format it so that the old fstab entry would work with the new
:drive (that is the NFS exported partition would be called /dev/wd1s1h --
:same device number, no?) I then used dump/restore to ensure that the
:inode numbers would remain the same. Making to further changes I shut down
:the machine, swapped in the new drive and brought the system back up. The
:new drive was mounted faithfully by the old fstab. Yet I now see
:"Stale NFS Handle"s on my clients. What did I do wrong?
:
:--
:David Cross | email: crossd@cs.rpi.edu
It's probably the file iteration number, which the NFS server uses
to detect when a file is destroyed (inode is freed), and then the inode
is reused for something else.
I think this case after dump/restore was written, so restore has no clue
about it.
/usr/include/ufs/ufs/dinode.h, I think it's the 'di_gen' field.
When you newfs a filesystem it's supposed to populate this field with
a random number also.
So short of doing a disk-to-disk image copy, there is no way you would
be able to maintain disk consistency from NFS's point of view.
-Matt
Matthew Dillon
<dillon@backplane.com>
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