Re: cp failure to NetApp directory with CIFS security model

[Eric Blake]

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According to Paul Eggert on 11/1/2007 2:27 PM:
> Clarence Donath <address@hidden> writes:
> 
>> open("/p/inet/cron", O_WRONLY|O_CREAT|O_EXCL|O_LARGEFILE, 0644) = -1
>> EPERM (Operation not permitted)
> 
>> The resultant destination file is created, but left empty by 'cp'.
> 
> Wow, open() creates the file but then returns -1?  That's a serious
> bug in the OS or the filer.

FWIW, CVS cygwin had a similar bug for about a one month window a while
ago: http://cygwin.com/ml/cygwin/2007-09/msg00407.html
I found it very annoying when using cygwin snapshots where mv would fail
but cp succeed, all because open was creating the file while returning -1.
 Fortunately, current cygwin snapshots no longer have this bug.

> 
> I don't offhand see an easy way to work around this bug in coreutils,
> without introducing some performance problems (or security holes) on
> non-buggy systems.

Agreed.  I would push back on the CIFS people to fix their bug.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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