Check whether a directory is still used as mount point before unlinking. This is done to prevent data loss when the device or resource is busy.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1377 3c3d7b80-5828-415e-9f61-280b98178fff
Check whether a directory is still used as mount point before unlinking. This is done to prevent data loss when the device or resource is busy.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1378 3c3d7b80-5828-415e-9f61-280b98178fff