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⟩.