The locking/waiting hierarchy here is this:

 - lock scp's bufCreateLock

 - resv multiple simul. buffers reservation
 - lock buffer I/O flags
 - lock buffer's mutex

 - smb_fid_t mutex

 - scache flags (storing, fetching, etc); if set for more than one
	vnode in a volume, must be set in vnode order (see cm_Rename).

 - scache mutex

 - lock tran_globalLock
 - lock buf_globalLock

 - userp->mx

 - lock cm_scacheLock

 - volp->mx

 - cm_connLock	(locked before cm_userLock in cm_GCConnections)
 - cm_cellLock
 - cm_serverLock (locked after cm_cellLock in cm_IoctlGetCell)
 - other global locks
 - cm_aclLock (locked before cm_userLock throughout cm_aclent.c)
 - cm_userLock