05-20-2008
it says ranges must be increasing..you mean you can't do a decrement?
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LEARN ABOUT FREEBSD
vrele
VRELE(9) BSD Kernel Developer's Manual VRELE(9)
NAME
vput, vrele, vunref -- decrement the use count for a vnode
SYNOPSIS
#include <sys/param.h>
#include <sys/vnode.h>
void
vput(struct vnode *vp);
void
vrele(struct vnode *vp);
void
vunref(struct vnode *vp);
DESCRIPTION
Decrement the v_usecount field of a vnode.
vp the vnode to decrement
The vrele() function takes an unlocked vnode and returns with the vnode unlocked.
The vput() function should be given a locked vnode as argument, the vnode is unlocked after the function returned. The vput() is opera-
tionally equivalent to calling VOP_UNLOCK(9) followed by vrele(9), with less overhead.
The vunref() function takes a locked vnode as argument, and returns with the vnode locked.
Any code in the system which signified its use of a vnode by usecount should call one of the listed function to decrement use counter. If
the v_usecount field of the non-doomed vnode reaches zero, then it will be inactivated and placed on the free list. Since the functions
might need to call VOPs for the vnode, the Giant mutex should be conditionally locked around the call.
The hold count for the vnode is always greater or equal to the usecount. Non-forced unmount fails when mount point owns a vnode that has
non-zero usecount, see vflush(9).
SEE ALSO
vget(9), vnode(9), vref(9), vrefcnt(9)
AUTHORS
This manual page was written by Doug Rabson and
Konstantin Belousov.
BSD
November 20, 2010 BSD