[OpenAFS-devel] 1.3.86 LINUX largefile-support broken

[Rainer Toebbicke]

Hartmut Reuter wrote:

> 
> Well, I have now after Rainer's patch been able to write and read a 5 gb 
> file and it seems to work. But I am not sure that all kernel versions 
> support this. Therefor 5 years ago I chose this - may be ugly or 
> complicated - code to have large file support under linux which always 
> worked.
> 


OK, I can confirm that once page_offset got defined correctly (but the 
latest version of the patch using just the loff_t cast should solve this 
just fine) I was able to copy an ~8G file (actually, a software library 
volume dump with lots of entropy) into AFS and read it back via 'cksum'.

The good news: the cksum of the original and the file in AFS match!

Performance was lousy, though. Every now and then during the write the 
client would hammer the fileserver for almost a half a minute with 
zero-length FetchData RPCs (!), confirmed by fstrace on the client. I 
vaguely remember having already seen this, though.

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Rainer Toebbicke
European Laboratory for Particle Physics(CERN) - Geneva, Switzerland
Phone: +41 22 767 8985       Fax: +41 22 767 7155