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RE: recent nfs change causes autofs regression

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To: Hua Zhong <hzhong@...>
Cc: 'Linux Kernel Mailing List' <linux-kernel@...>, 'Linus Torvalds' <torvalds@...>, <akpm@...>
Date: Thursday, August 30, 2007 - 7:22 pm

On Thu, 2007-08-30 at 15:47 -0700, Hua Zhong wrote:

"better" as in: "I now have a chance to notice, when my 'read-only
mount' is actually 'read-write'".


Yes. The default values for acregmin, acregmax, acdirmin, acdirmax are
not 600. If /a/tools and /a/share are on the same filesystem on the
server, then the NFS client should warn you that you are about to do
something that may result in cache coherency problems instead of
silently allowing it, and then leaving you to debug the coherency issue.

If you know what you are doing, then there is an option which allows you
to override the default behaviour.


Your turn to define what you mean by "working"? In my book that means "a
setup that doesn't include unexpected or unintended behaviour".

Not being able to notice cache coherency failures on a file that is
mounted in two different places with two different sets of mount options
counts as "unexpected behaviour".

Not being able to notice that your mount options have been overridden by
the kernel also counts as "unexpected behaviour".

Trond

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Messages in current thread:
recent nfs change causes autofs regression, Hua Zhong, (Thu Aug 30, 5:07 pm)
Re: recent nfs change causes autofs regression, Frank van Maarseveen, (Fri Aug 31, 4:14 am)
Re: recent nfs change causes autofs regression, Ian Kent, (Fri Aug 31, 5:05 am)
Re: recent nfs change causes autofs regression, Trond Myklebust, (Thu Aug 30, 6:37 pm)
Re: recent nfs change causes autofs regression, Linus Torvalds, (Thu Aug 30, 11:49 pm)
Re: recent nfs change causes autofs regression, Trond Myklebust, (Fri Aug 31, 12:21 pm)
Re: recent nfs change causes autofs regression, Bill Davidsen, (Sat Sep 1, 8:58 pm)
Re: recent nfs change causes autofs regression, David Howells, (Tue Sep 4, 3:54 am)
Re: recent nfs change causes autofs regression, Ian Kent, (Wed Sep 5, 8:44 am)
Re: recent nfs change causes autofs regression, Trond Myklebust, (Wed Sep 5, 12:26 pm)
Re: recent nfs change causes autofs regression, David Howells, (Wed Sep 5, 11:37 am)
Re: recent nfs change causes autofs regression, Trond Myklebust, (Wed Sep 5, 11:50 am)
Re: recent nfs change causes autofs regression, Ian Kent, (Thu Sep 6, 1:23 am)
Re: recent nfs change causes autofs regression, Bill Davidsen, (Wed Sep 5, 8:35 am)
Re: recent nfs change causes autofs regression, David Howells, (Wed Sep 5, 11:34 am)
RE: recent nfs change causes autofs regression, Hua Zhong, (Fri Aug 31, 2:47 pm)
RE: recent nfs change causes autofs regression, Trond Myklebust, (Fri Aug 31, 3:13 pm)
RE: recent nfs change causes autofs regression, Hua Zhong, (Fri Aug 31, 3:35 pm)
Re: recent nfs change causes autofs regression, Linus Torvalds, (Fri Aug 31, 1:01 pm)
Re: recent nfs change causes autofs regression, David Howells, (Tue Sep 4, 4:35 am)
Re: recent nfs change causes autofs regression, Linus Torvalds, (Tue Sep 4, 5:04 am)
Re: recent nfs change causes autofs regression, David Howells, (Tue Sep 4, 4:02 am)
Re: recent nfs change causes autofs regression, Trond Myklebust, (Fri Aug 31, 3:03 pm)
Re: recent nfs change causes autofs regression, Trond Myklebust, (Fri Aug 31, 12:44 am)
Re: recent nfs change causes autofs regression, Linus Torvalds, (Fri Aug 31, 12:59 am)
Re: recent nfs change causes autofs regression, Ian Kent, (Fri Aug 31, 1:38 am)
Re: recent nfs change causes autofs regression, Martin Knoblauch, (Fri Aug 31, 4:54 am)
Re: recent nfs change causes autofs regression, Trond Myklebust, (Fri Aug 31, 1:04 am)
RE: recent nfs change causes autofs regression, Hua Zhong, (Fri Aug 31, 1:24 am)
Re: recent nfs change causes autofs regression, Linus Torvalds, (Fri Aug 31, 1:16 am)
Re: recent nfs change causes autofs regression, Jakob Oestergaard, (Fri Aug 31, 3:40 am)
Re: recent nfs change causes autofs regression, Frank van Maarseveen, (Fri Aug 31, 4:28 am)
Re: recent nfs change causes autofs regression, Linus Torvalds, (Fri Aug 31, 4:07 am)
Re: recent nfs change causes autofs regression, Trond Myklebust, (Fri Aug 31, 8:11 am)
Re: recent nfs change causes autofs regression, David Howells, (Tue Sep 4, 3:51 am)
Re: recent nfs change causes autofs regression, Frank van Maarseveen, (Fri Aug 31, 9:12 am)
Re: recent nfs change causes autofs regression, Trond Myklebust, (Fri Aug 31, 9:50 am)
Re: recent nfs change causes autofs regression, Frank van Maarseveen, (Fri Aug 31, 10:42 am)
Re: recent nfs change causes autofs regression, Jakob Oestergaard, (Fri Aug 31, 4:51 am)
Re: recent nfs change causes autofs regression, Linus Torvalds, (Fri Aug 31, 12:43 pm)
Re: recent nfs change causes autofs regression, Jakob Oestergaard, (Mon Sep 3, 9:20 am)
Re: recent nfs change causes autofs regression, Martin Knoblauch, (Mon Sep 3, 9:43 am)
RE: recent nfs change causes autofs regression, Hua Zhong, (Thu Aug 30, 11:57 pm)
Re: recent nfs change causes autofs regression, Andrew Morton, (Thu Aug 30, 9:24 pm)
Re: recent nfs change causes autofs regression, Trond Myklebust, (Fri Aug 31, 12:33 am)
RE: recent nfs change causes autofs regression, Hua Zhong, (Thu Aug 30, 6:47 pm)
RE: recent nfs change causes autofs regression, Trond Myklebust, (Thu Aug 30, 7:22 pm)
RE: recent nfs change causes autofs regression, Hua Zhong, (Thu Aug 30, 7:30 pm)
RE: recent nfs change causes autofs regression, Trond Myklebust, (Thu Aug 30, 7:37 pm)
RE: recent nfs change causes autofs regression, Hua Zhong, (Thu Aug 30, 7:44 pm)
RE: recent nfs change causes autofs regression, Trond Myklebust, (Fri Aug 31, 12:31 am)
Re: recent nfs change causes autofs regression, Matthias Schniedermeyer, (Fri Aug 31, 3:50 am)
RE: recent nfs change causes autofs regression, Ian Kent, (Fri Aug 31, 1:09 am)
RE: recent nfs change causes autofs regression, Linus Torvalds, (Fri Aug 31, 12:38 am)
RE: recent nfs change causes autofs regression, Trond Myklebust, (Fri Aug 31, 12:57 am)
RE: recent nfs change causes autofs regression, Hua Zhong, (Fri Aug 31, 12:47 am)
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