On May 14, 2012, at 10:03 AM, Tommi Virtanen wrote:

> On Fri, May 11, 2012 at 6:21 PM, Noah Watkins <[email protected]> wrote:
>> Return an error rather than a segfault if a client uses the interface
>> when unmounted. The Java bindings were explicitly enforcing the
>> mounted state, but this was overly complicated, uncommon, and better
>> handled with a simple exception that can be checked at libcephfs level.
> ...
>> +  if (!cmount->is_mounted())
>> +    return -EDOM;
> 
> Noah, this is not really about your patch, as existing code already
> has return -EDOM, but... oh boy does the API abuse POSIX errors.
> 
> "Numerical argument out of domain".

:)   Yeh, i stared at errno.h for a while. Note that -EDOM is already returned 
by mount() when it is already mounted.

-Noah

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