vdrop man page on FreeBSD

vdrop man page on FreeBSD

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VHOLD(9)		 BSD 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 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 refer‐
     enced, 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⟩.

BSD				 April 1, 2007				   BSD

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