respective setter/getter methods to the KPartition class.
If a partition is mounted, the field will contain the cookie the
FS's mount() hook passed back to the VFS. This way the FS has
access to its internal data structures. We need the cooperation
of the VFS to get the cookie.
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4776 a95241bf-73f2-0310-859d-f6bbb57e9c96
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