decrement the use count for a
Decrement the v_usecount field of the vnode specified by vp.
Any code in the system which uses a vnode should call
it is finished with the vnode. If the v_usecount field
of the vnode reaches zero, the vnode will be placed on the free list.
vrele() returns 0 if it can guarantee that
it did not sleep.
vget(9), vnode(9), vput(9), vref(9)
This man page was originally written by Doug Rabson for FreeBSD.