Re: [NFS] blocks of zeros (NULLs) in NFS files in kernels >= 2.6.20

From: Aaron Straus
Date: Thu Sep 11 2008 - 13:19:21 EST


On Sep 11 12:55 PM, Chuck Lever wrote:
> A more thorough review of the NFS write and flush logic that exists in
> 2.6.27 is needed if we choose to recognize this issue as a real
> problem.


Sorry. I didn't mean we should revert the hunk. I was just trying to
help identify the cause of the new behavior.

I think this is a real problem albeit not a "serious" one. Network
file-systems usually try to avoid readers seeing blocks of zeros in
files, especially in this simple writer/reader case.

It wouldn't be bad if the file is written out of order occasionally, but
we see this constantly now.

We cannot write/read log files to NFS mounts reliably any more. That
seems like a valid use case which no longer works?

Anyway, thanks for your time!


Aaron Straus
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