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From: Neil Brown <neilb@cse.unsw.edu.au>
To: "=?iso-8859-1?Q?Augusto_C=E9sar_Radtke?="
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Cc: ext3-users@redhat.com, nfs@lists.sourceforge.net
Subject: Re: [NFS] Re: Is ext3 kernel nfsd friendly?
In-Reply-To: message from =?iso-8859-1?Q?Augusto_C=E9sar_Radtke?= on Monday
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Date: Wed, 31 Jan 2001 11:10:35 +1100 (EST)
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On Monday January 29, radtke@conectiva.com wrote:> Andreas Dilger wrote:
>
> > I've been using knfsd on ext3 (2.2.17 kernel) for quite some time
without
> > problems. However, this is the older NFS code, and not the major
changes
> > that went into NFS for 2.2.18, so YMMV.
>
> I'm using NFS with 2.2.19pre7 + ext3 without any problems yet, quite
stable.
Ofcourse, "apparently stable" is quite different from "absolutely
reliable"...
I haven't looked at ext3 or played with it but in order for a
filesystem to work with knfsd (in it's current form) it must:
Support the read_inode super_operation and
1/ recognise if the inode number refers to a currently active inode
or not
2a/ if not, must return an is_bad_inode() inode.
2b/ if so must provide a completely filled-in inode (nfs doesn't for
example.
ext2 does, ext3 almost certainly does).
3/ The "delete_inode" super_operation must cope gracefully with
being given an is_bad_inode.
4/ Should keep a "generation" number in the inode-on-disk, should
assigned a "new" value to this when the inode is allocated, and
should store this value in the i_generation field of the "struct
inode".
Before I started looking at knfsd, ext2 did not do 1 (or 2a) or 3, and
I think there was something funny with 4, but I'm not sure.
If ext3 does all these, it should work fine. If not, I suspect they
would be fairly straight forward to add.
NeilBrown
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