Create on Read breaks fs usage (fix proposed)

[joel-wright]

Create on read has conflicting requirements to usage as a filesystem. In order to allow create on read we have to also have getattr return something sensible for files not in the fs list. Unfortunately, this means that when we try to mkdir, getattr returns attributes that tell the system the file/directory already exists.

Will look into ways to fix it

[joel-wright]

The only thing I can come up with atm is to disallow folder names that match valid filenames.

[joel-wright]

The only other option I can come up with is to only allow folders at the root of the fs, and only files within the first level folders. This would allow me to distinguish between "getattr for file creation" and "getattr for mkdir".

[joel-wright]

Proposed fix pushed to alpha.

The only thing missing is create-on-read at the root level when mounted as a filesystem. Create on read within folders still works, and mkdir is working again.