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VHOLD(9)		   Kernel Developer's Manual		      VHOLD(9)

NAME
       vhold, vdrop, vdropl -- acquire/release a hold on a vnode

SYNOPSIS
       #include	<sys/param.h>
       #include	<sys/vnode.h>

       void
       vhold(struct vnode *vp);

       void
       vholdl(struct vnode *vp);

       void
       vdrop(struct vnode *vp);

       void
       vdropl(struct vnode *vp);

DESCRIPTION
       The vhold() and vholdl()	functions increment the	v_holdcnt of the given
       vnode.	If  the	 vnode	has already been added to the free list	and is
       still referenced, it will be removed.

       The vdrop() and vdropl()	functions decrement the	v_holdcnt of  the  vn-
       ode.   If  the holdcount	is less	than or	equal to zero prior to calling
       vdrop() or vdropl(), the	system will panic.  If the vnode is no	longer
       referenced, it will be freed.

       vhold()	and  vdrop()  lock  the	 vnode	interlock  while  vholdl() and
       vdropl()	expect the interlock to	already	be held.

SEE ALSO
       vnode(9)

AUTHORS
       This manual page	was written by Chad David <davidc@acns.ab.ca>.

FreeBSD	9.3			 April 1, 2007			      VHOLD(9)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=vhold&sektion=9&manpath=FreeBSD+9.3-RELEASE>

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