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null_subr.c (33134) null_subr.c (33181)
1/*
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without

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30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)null_subr.c 8.7 (Berkeley) 5/14/95
37 *
1/*
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without

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30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)null_subr.c 8.7 (Berkeley) 5/14/95
37 *
38 * $Id: null_subr.c,v 1.15 1998/02/04 22:32:46 eivind Exp $
38 * $Id: null_subr.c,v 1.16 1998/02/06 12:13:36 eivind Exp $
39 */
40
41#include "opt_debug_nullfs.h"
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/proc.h>
46#include <sys/vnode.h>

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56 * Each cache entry holds a reference to the lower vnode
57 * along with a pointer to the alias vnode. When an
58 * entry is added the lower vnode is VREF'd. When the
59 * alias is removed the lower vnode is vrele'd.
60 */
61
62#define NULL_NHASH(vp) \
63 (&null_node_hashtbl[(((u_long)vp)>>LOG2_SIZEVNODE) & null_node_hash])
39 */
40
41#include "opt_debug_nullfs.h"
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/proc.h>
46#include <sys/vnode.h>

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56 * Each cache entry holds a reference to the lower vnode
57 * along with a pointer to the alias vnode. When an
58 * entry is added the lower vnode is VREF'd. When the
59 * alias is removed the lower vnode is vrele'd.
60 */
61
62#define NULL_NHASH(vp) \
63 (&null_node_hashtbl[(((u_long)vp)>>LOG2_SIZEVNODE) & null_node_hash])
64LIST_HEAD(null_node_hashhead, null_node) *null_node_hashtbl;
65u_long null_node_hash;
64static LIST_HEAD(null_node_hashhead, null_node) *null_node_hashtbl;
65static u_long null_node_hash;
66
67static int null_node_alloc __P((struct mount *mp, struct vnode *lowervp,
68 struct vnode **vpp));
69static struct vnode *
70 null_node_find __P((struct mount *mp, struct vnode *lowervp));
71
72/*
73 * Initialise cache headers

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66
67static int null_node_alloc __P((struct mount *mp, struct vnode *lowervp,
68 struct vnode **vpp));
69static struct vnode *
70 null_node_find __P((struct mount *mp, struct vnode *lowervp));
71
72/*
73 * Initialise cache headers

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