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 vnode.  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>.

Debian                                            April 1, 2007                                         VHOLD(9)