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null.h
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Editing: null.h
/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software donated to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)null.h 8.3 (Berkeley) 8/20/94 * * $FreeBSD$ */ #ifndef FS_NULL_H #define FS_NULL_H #define NULLM_CACHE 0x0001 struct null_mount { struct mount *nullm_vfs; struct vnode *nullm_lowerrootvp; /* Ref to lower root vnode */ uint64_t nullm_flags; }; #ifdef _KERNEL /* * A cache of vnode references */ struct null_node { LIST_ENTRY(null_node) null_hash; /* Hash list */ struct vnode *null_lowervp; /* VREFed once */ struct vnode *null_vnode; /* Back pointer */ u_int null_flags; }; #define NULLV_NOUNLOCK 0x0001 #define NULLV_DROP 0x0002 #define MOUNTTONULLMOUNT(mp) ((struct null_mount *)((mp)->mnt_data)) #define VTONULL(vp) ((struct null_node *)(vp)->v_data) #define NULLTOV(xp) ((xp)->null_vnode) int nullfs_init(struct vfsconf *vfsp); int nullfs_uninit(struct vfsconf *vfsp); int null_nodeget(struct mount *mp, struct vnode *target, struct vnode **vpp); struct vnode *null_hashget(struct mount *mp, struct vnode *lowervp); void null_hashrem(struct null_node *xp); int null_bypass(struct vop_generic_args *ap); #ifdef DIAGNOSTIC struct vnode *null_checkvp(struct vnode *vp, char *fil, int lno); #define NULLVPTOLOWERVP(vp) null_checkvp((vp), __FILE__, __LINE__) #else #define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp) #endif extern struct vop_vector null_vnodeops; #ifdef MALLOC_DECLARE MALLOC_DECLARE(M_NULLFSNODE); #endif #ifdef NULLFS_DEBUG #define NULLFSDEBUG(format, args...) printf(format ,## args) #else #define NULLFSDEBUG(format, args...) #endif /* NULLFS_DEBUG */ #endif /* _KERNEL */ #endif
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