Re: Make libcephfs return error when unmounted?

[Noah Watkins <jayhawk@xxxxxxxxxxx>]

On Apr 11, 2012, at 3:13 PM, Greg Farnum wrote:

> On Wednesday, April 11, 2012 at 2:59 PM, Noah Watkins wrote:
>> 
>> On Apr 11, 2012, at 11:22 AM, Yehuda Sadeh Weinraub wrote:
>> 
>>> Also need to check that cmount is initialized. I'd add a helper:
>>> 
>>> Client *ceph_get_client(struct ceph_mount_info *cmont)
>>> {
>>> if (cmount && cmount->is_mounted())
>>> return cmount->get_client();
>>> 
>>> return NULL;
>>> }
>> 
>> 
>> 
>> How useful is checking cmount != NULL here? This defensive check depends on users initializing their cmount pointers to NULL, but the API doesn't do anything to require this initialization assumption.
>> 
>> - Noah 
> I had a whole email going until I realized you were just right. So, yeah, that wouldn't do anything since a cmount they forgot to have the API initialize is just going to hold random data. Urgh.

One could pair the pointer with a magic value in a separate structure, but even libc doesn't go to these lengths to protect users...--
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