Package: util-linux Version: 2.20.1-5.3 man mount shows under section 'FILESYSTEM INDEPENDENT MOUNT OPTIONS' :
keybits
Specifies the key size to use for an encryption algorithm. Used
in conjunction with the loop and encryption options.
nofail Do
not report errors for this device if it does not exist. iver-
sion Every time the inode is modified, the i_version
field will
be incremented.
The nofail and iversion options should be their own options, not a
continuation of 'keybits'.
