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Set up d_fsdata on the root dentry. This fixes a NULL pointer dereference in ceph_d_prune on umount. It also means we can eventually strip out all of the conditional checks on d_fsdata because it is now set unconditionally (prior to setting up the d_ops). Fix the ceph_d_prune debug print while we're here. Signed-off-by: Sage Weil <sage@newdream.net>