---1463799052-995404922-903881238=:316
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On Sat, 22 Aug 1998, Bill Hawes wrote:
> Steven N. Hirsch wrote:
>
> > I built and installed HJ's latest userland knfs utitilities in hopes that
> > file locking would work. No luck.
> Hi Steve,
>
> I'd like to track down the NFS locking problems you've reported, and wondered
> if you could send a copy of the script you're using for testing, or any other
> simple example to illustrate the problem.
>
> I don't use NFS locking for everyday work, but have tested it in the past
> with seeming success, so my assumption is that some recent change has caused
> (or simply revealed) the problem.
Hi Bill,
HJ Liu confirmed that things were, in fact, broken. I've attached his
kernel patch (modified slightly to apply against 2.1.117) which seems to
set things straight.
> Any idea which kernel release first showed the locking problems?
None whatever. I never even tried locking until 2.1.116!
It would be lovely if you, Alan and hj could pool your efforts towards
squashing the few remaining NFS bugs. Echoing the sentiments of others,
I'd say that the improved performance will be a major motivation behind
the typical Linux user upgrading to 2.2. I'd hate to see it get a bad rap
because of a few warts.
Alan had asked about repeatable bugs. The only ones that I've observed
across multiple kernel versions (~2.1.7x through present) are:
- Occasional file corruption and truncation when copying files from client
to server. This is incredibly rare, and I've found no good way to
reproduce it. Since it is never accompanied by error messages, I usually
find out later when, e.g. attempts at unpacking a downloaded tarball fail
with "tar archive truncated.." messages.
n.b. Alan: The Ooops's didn't appear until 2.1.117, AFAIK. They have not
been a longstanding issue.
- More commonly, a mass 'cp -a' of the entire kernel source tree from
server to client will result in one or more target directories being
completely empty. Again, not easily reproducible and no error messages.
- When building the kernel on an NFS mounted directory, a 'make mrproper'
will sometimes fail with numerous complaints about "files in use" when
trying to remove the linux/include/config hierarchy. Usually, the second
attempt succeeds.
I know this is not much to go on, but perhaps it may suggest a set of
functions to instrument? Again, these are quite rare but have persisted
over quite a number of kernel revs.
Steve
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