df -h on Mac OS X shows webdav mounted but at 100% capacity

[jerry57]

poplar:~ jerry$ df -h
Filesystem Size Used Avail Capacity iused ifree %iused Mounted on
/dev/disk1 465Gi 409Gi 55Gi 89% 107351394 14486204 88% /
devfs 184Ki 184Ki 0Bi 100% 638 0 100% /dev
map -hosts 0Bi 0Bi 0Bi 100% 0 0 100% /net
map auto_home 0Bi 0Bi 0Bi 100% 0 0 100% /home
https://qadataweb.iplantcollaborative.org/ 0Bi 0Bi 0Bi 100% 0 0 100% /Users/jerry/webdav_mount
poplar:~ jerry$ du -sh /Users/jerry/webdav_mou*
22G /Users/jerry/webdav_mount

I only have 22GB stored in the irods mount and my quota is 100GB.

[michael-conway]

may be related to #35