On Aug 26, 2009, at 1:08 PM, Steve Dickson wrote:
On 08/26/2009 12:35 PM, Chuck Lever wrote:
On Aug 26, 2009, at 11:07 AM, Steve Dickson wrote:
I think that would be a much better approach. If nfs4 goes away
someday, for example, it will be completely transparent to the
mount
command if we've already pushed "-t nfs, vers=4" conversion into
the
kernel.
Well when/if that day comes, we can easily pull the patches from the
mount
command.
You know it's never that easy. The mount command has to keep legacy
logic for older kernels. I'm just saying that the less the mount
command has to worry about what kernel version is running, the
cleaner
the mount command will be.
Well with this patch, since we are only concentrating on text mounts,
we are already breaking with the tradition of keeping legacy logic...
And again as long as the nfs4 file system exists this approach will
work...
We are pushing all of the details of NFS mounting into the kernel
anyway, over time.
Which I've never been a fan of... Again it's much easier change user
level code (and more people can do it) than kernel code...
especially
with things of this nature...
People can continue to change the mount command all they want. In
fact
the user space text-based option parsing code is pretty darn
flexible as
it is now.
Yes... the user space parsing code is very well written...
I don't think we're denying that your proposal is expedient. The
question I think is where we want to be in the long run,
NFS v4 as the default protocol version followed by NFS V4.1 becoming
the
default protocol version.
and if your proposed method to handle -t nfs -o vers=4 will make
it more complicated to get there.
No. I'm proposing a simple shorthand patch that will make mounting
nfs4
file systems easier in hope of moving the technology forward by making
it more accessible... What I believe you are proposing is architecture
change to hide the fact nfs and nfs4 are separate file systems...
Nope, we're proposing doing the simple method in the kernel instead of
in the mount command.
But in the end, if we do the simple shorthand patch (making the
technology
available today) or the major architecture change (making the
technology
available the distant future) with both approaches 'mount -o v4'
will do the exact same thing...
I for moving the technology today...
steved.
--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com
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