[apple/xnu.git] / bsd / miscfs / nullfs / null_vfsops.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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_vfsops.c	8.7 (Berkeley) 5/14/95
 *
 * @(#)lofs_vfsops.c	1.2 (Berkeley) 6/18/92
 */

/*
 * Null Layer
 * (See null_vnops.c for a description of what this does.)
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/vnode.h>
#include <sys/mount_internal.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <miscfs/nullfs/null.h>

/*
 * Mount null layer
 */
static int
nullfs_mount(mp, devvp, data, context)
	struct mount *mp;
	vnode_t devvp;
	user_addr_t data;
	vfs_context_t context;
{
	int error = 0;
	struct user_null_args args;
	struct vnode *lowerrootvp, *vp;
	struct vnode *nullm_rootvp;
	struct null_mount *xmp;
	u_int size;

#ifdef NULLFS_DIAGNOSTIC
	printf("nullfs_mount(mp = %x)\n", mp);
#endif

	/*
	 * Update is a no-op
	 */
	if (mp->mnt_flag & MNT_UPDATE) {
		return (ENOTSUP);
		/* return VFS_MOUNT(MOUNTTONULLMOUNT(mp)->nullm_vfs, devvp, data,  p);*/
	}

	/*
	 * Get argument
	 */
	if (vfs_context_is64bit(context)) {
		error = copyin(data, (caddr_t)&args, sizeof (args));
	}
	else {
		struct null_args temp;
		error = copyin(data, (caddr_t)&temp, sizeof (temp));
		args.target = CAST_USER_ADDR_T(temp.target);
	}
	if (error)
		return (error);

	/*
	 * Find lower node
	 */
	NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
		UIO_USERSPACE, args.target, context);
	if (error = namei(ndp))
		return (error);
	nameidone(ndp);
	/*
	 * Sanity check on lower vnode
	 */
	lowerrootvp = ndp->ni_vp;

	vnode_put(ndp->ni_dvp);
	ndp->ni_dvp = NULL;

	xmp = (struct null_mount *) _MALLOC(sizeof(struct null_mount),
				M_UFSMNT, M_WAITOK);	/* XXX */

	/*
	 * Save reference to underlying FS
	 */
	xmp->nullm_vfs = lowerrootvp->v_mount;

	/*
	 * Save reference.  Each mount also holds
	 * a reference on the root vnode.
	 */
	error = null_node_create(mp, lowerrootvp, &vp);
	/*
	 * Make sure the node alias worked
	 */
	if (error) {
		vnode_put(lowerrootvp);
		FREE(xmp, M_UFSMNT);	/* XXX */
		return (error);
	}

	/*
	 * Keep a held reference to the root vnode.
	 * It is vnode_put'd in nullfs_unmount.
	 */
	nullm_rootvp = vp;
	nullm_rootvp->v_flag |= VROOT;
	xmp->nullm_rootvp = nullm_rootvp;
	if (NULLVPTOLOWERVP(nullm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
		mp->mnt_flag |= MNT_LOCAL;
	mp->mnt_data = (qaddr_t) xmp;
	vfs_getnewfsid(mp);

	(void) copyinstr(args.target, mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN - 1, 
	    &size);
	bzero(mp->mnt_vfsstat.f_mntfromname + size, MNAMELEN - size);
#ifdef NULLFS_DIAGNOSTIC
	printf("nullfs_mount: lower %s, alias at %s\n",
		mp->mnt_vfsstat.f_mntfromname, mp->mnt_vfsstat.f_mntonname);
#endif
	return (0);
}

/*
 * VFS start.  Nothing needed here - the start routine
 * on the underlying filesystem will have been called
 * when that filesystem was mounted.
 */
static int
nullfs_start(mp, flags, context)
	struct mount *mp;
	int flags;
	vfs_context_t context;
{
	return (0);
	/* return VFS_START(MOUNTTONULLMOUNT(mp)->nullm_vfs, flags, context); */
}

/*
 * Free reference to null layer
 */
static int
nullfs_unmount(mp, mntflags, context)
	struct mount *mp;
	int mntflags;
	vfs_context_t context;
{
	struct vnode *nullm_rootvp = MOUNTTONULLMOUNT(mp)->nullm_rootvp;
	int error;
	int flags = 0;
	int force = 0;

#ifdef NULLFS_DIAGNOSTIC
	printf("nullfs_unmount(mp = %x)\n", mp);
#endif

	if (mntflags & MNT_FORCE) {
		flags |= FORCECLOSE;
		force = 1;
	}

	if ( (nullm_rootvp->v_usecount > 1) && !force )
		return (EBUSY);
	if ( (error = vflush(mp, nullm_rootvp, flags)) && !force )
		return (error);

#ifdef NULLFS_DIAGNOSTIC
	vprint("alias root of lower", nullm_rootvp);
#endif	 
	/*
	 * Release reference on underlying root vnode
	 */
	vnode_put(nullm_rootvp);
	/*
	 * And blow it away for future re-use
	 */
	vnode_reclaim(nullm_rootvp);
	/*
	 * Finally, throw away the null_mount structure
	 */
	FREE(mp->mnt_data, M_UFSMNT);	/* XXX */
	mp->mnt_data = 0;
	return 0;
}

static int
nullfs_root(mp, vpp, context)
	struct mount *mp;
	struct vnode **vpp;
	vfs_context_t context;
{
	struct proc *p = curproc;	/* XXX */
	struct vnode *vp;

#ifdef NULLFS_DIAGNOSTIC
	printf("nullfs_root(mp = %x, vp = %x->%x)\n", mp,
			MOUNTTONULLMOUNT(mp)->nullm_rootvp,
			NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp)
			);
#endif

	/*
	 * Return locked reference to root.
	 */
	vp = MOUNTTONULLMOUNT(mp)->nullm_rootvp;
	vnode_get(vp);
	*vpp = vp;
	return 0;
}

static int
nullfs_quotactl(mp, cmd, uid, datap, context)
	struct mount *mp;
	int cmd;
	uid_t uid;
	caddr_t datap;
	vfs_context_t context;
{
	return VFS_QUOTACTL(MOUNTTONULLMOUNT(mp)->nullm_vfs, cmd, uid, datap, context);
}

static int
nullfs_statfs(mp, sbp, context)
	struct mount *mp;
	struct vfsstatfs *sbp;
	vfs_context_t context;
{
	int error;
	struct vfsstatfs mstat;

#ifdef NULLFS_DIAGNOSTIC
	printf("nullfs_statfs(mp = %x, vp = %x->%x)\n", mp,
			MOUNTTONULLMOUNT(mp)->nullm_rootvp,
			NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp)
			);
#endif

	bzero(&mstat, sizeof(mstat));

	error = VFS_STATFS(MOUNTTONULLMOUNT(mp)->nullm_vfs, &mstat, context);
	if (error)
		return (error);

	/* now copy across the "interesting" information and fake the rest */
	//sbp->f_type = mstat.f_type;
	sbp->f_flags = mstat.f_flags;
	sbp->f_bsize = mstat.f_bsize;
	sbp->f_iosize = mstat.f_iosize;
	sbp->f_blocks = mstat.f_blocks;
	sbp->f_bfree = mstat.f_bfree;
	sbp->f_bavail = mstat.f_bavail;
	sbp->f_files = mstat.f_files;
	sbp->f_ffree = mstat.f_ffree;
	return (0);
}

static int
nullfs_sync(__unused struct mount *mp, __unused int waitfor,
	__unused kauth_cred_t cred, __unused vfs_context_t context)
{
	/*
	 * XXX - Assumes no data cached at null layer.
	 */
	return (0);
}

static int
nullfs_vget(mp, ino, vpp, context)
	struct mount *mp;
	ino64_t ino;
	struct vnode **vpp;
	vfs_context_t context;
{
	
	return VFS_VGET(MOUNTTONULLMOUNT(mp)->nullm_vfs, ino, vpp, context);
}

static int
nullfs_fhtovp(mp, fhlen, fhp, vpp, context)
	struct mount *mp;
	int fhlen;
	unsigned char *fhp;
	struct vnode **vpp;
	vfs_context_t context;
{

	return VFS_FHTOVP(MOUNTTONULLMOUNT(mp)->nullm_vfs, fhlen, fhp, vpp, context);
}

static int
nullfs_vptofh(vp, fhlenp, fhp, context)
	struct vnode *vp;
	int *fhlenp;
	unsigned char *fhp;
	vfs_context_t context;
{
	return VFS_VPTOFH(NULLVPTOLOWERVP(vp), fhlenp, fhp, context);
}

int nullfs_init (struct vfsconf *);

#define nullfs_sysctl (int (*) (int *, u_int, user_addr_t, size_t *, user_addr_t, size_t, proc_t))eopnotsupp

struct vfsops null_vfsops = {
	nullfs_mount,
	nullfs_start,
	nullfs_unmount,
	nullfs_root,
	nullfs_quotactl,
	nullfs_statfs,
	nullfs_sync,
	nullfs_vget,
	nullfs_fhtovp,
	nullfs_vptofh,
	nullfs_init,
	nullfs_sysctl
};
Commit	Line	Data
1c79356b	1	/*
5d5c5d0d A	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	29	/*
	30	* Copyright (c) 1992, 1993
	31	* The Regents of the University of California. All rights reserved.
	32	*
	33	* This code is derived from software donated to Berkeley by
	34	* Jan-Simon Pendry.
	35	*
	36	* Redistribution and use in source and binary forms, with or without
	37	* modification, are permitted provided that the following conditions
	38	* are met:
	39	* 1. Redistributions of source code must retain the above copyright
	40	* notice, this list of conditions and the following disclaimer.
	41	* 2. Redistributions in binary form must reproduce the above copyright
	42	* notice, this list of conditions and the following disclaimer in the
	43	* documentation and/or other materials provided with the distribution.
	44	* 3. All advertising materials mentioning features or use of this software
	45	* must display the following acknowledgement:
	46	* This product includes software developed by the University of
	47	* California, Berkeley and its contributors.
	48	* 4. Neither the name of the University nor the names of its contributors
	49	* may be used to endorse or promote products derived from this software
	50	* without specific prior written permission.
	51	*
	52	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	53	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	54	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	55	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	56	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	57	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	58	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	59	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	60	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	61	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	62	* SUCH DAMAGE.
	63	*
	64	* @(#)null_vfsops.c 8.7 (Berkeley) 5/14/95
	65	*
	66	* @(#)lofs_vfsops.c 1.2 (Berkeley) 6/18/92
	67	*/
	68
	69	/*
	70	* Null Layer
	71	* (See null_vnops.c for a description of what this does.)
	72	*/
	73
	74	#include <sys/param.h>
	75	#include <sys/systm.h>
	76	#include <sys/proc.h>
91447636	77	#include <sys/kauth.h>
1c79356b A	78	#include <sys/time.h>
	79	#include <sys/types.h>
	80	#include <sys/vnode.h>
91447636	81	#include <sys/mount_internal.h>
1c79356b A	82	#include <sys/namei.h>
	83	#include <sys/malloc.h>
	84	#include <miscfs/nullfs/null.h>
	85
	86	/*
	87	* Mount null layer
	88	*/
91447636 A	89	static int
91447636 A	90	nullfs_mount(mp, devvp, data, context)
1c79356b	91	struct mount *mp;
91447636 A	92	vnode_t devvp;
	93	user_addr_t data;
	94	vfs_context_t context;
1c79356b A	95	{
1c79356b A	96	int error = 0;
91447636	97	struct user_null_args args;
1c79356b A	98	struct vnode lowerrootvp, vp;
	99	struct vnode *nullm_rootvp;
	100	struct null_mount *xmp;
	101	u_int size;
	102
	103	#ifdef NULLFS_DIAGNOSTIC
	104	printf("nullfs_mount(mp = %x)\n", mp);
	105	#endif
	106
	107	/*
	108	* Update is a no-op
	109	*/
	110	if (mp->mnt_flag & MNT_UPDATE) {
91447636 A	111	return (ENOTSUP);
91447636 A	112	/* return VFS_MOUNT(MOUNTTONULLMOUNT(mp)->nullm_vfs, devvp, data, p);*/
1c79356b A	113	}
	114
	115	/*
	116	* Get argument
	117	*/
91447636 A	118	if (vfs_context_is64bit(context)) {
	119	error = copyin(data, (caddr_t)&args, sizeof (args));
	120	}
	121	else {
	122	struct null_args temp;
	123	error = copyin(data, (caddr_t)&temp, sizeof (temp));
	124	args.target = CAST_USER_ADDR_T(temp.target);
	125	}
	126	if (error)
1c79356b A	127	return (error);
	128
	129	/*
	130	* Find lower node
	131	*/
	132	NDINIT(ndp, LOOKUP, FOLLOW\|WANTPARENT\|LOCKLEAF,
91447636	133	UIO_USERSPACE, args.target, context);
1c79356b A	134	if (error = namei(ndp))
1c79356b A	135	return (error);
91447636	136	nameidone(ndp);
1c79356b A	137	/*
	138	* Sanity check on lower vnode
	139	*/
	140	lowerrootvp = ndp->ni_vp;
	141
91447636	142	vnode_put(ndp->ni_dvp);
1c79356b A	143	ndp->ni_dvp = NULL;
	144
	145	xmp = (struct null_mount *) _MALLOC(sizeof(struct null_mount),
	146	M_UFSMNT, M_WAITOK); /* XXX */
	147
	148	/*
	149	* Save reference to underlying FS
	150	*/
	151	xmp->nullm_vfs = lowerrootvp->v_mount;
	152
	153	/*
	154	* Save reference. Each mount also holds
	155	* a reference on the root vnode.
	156	*/
	157	error = null_node_create(mp, lowerrootvp, &vp);
1c79356b A	158	/*
	159	* Make sure the node alias worked
	160	*/
	161	if (error) {
91447636	162	vnode_put(lowerrootvp);
1c79356b A	163	FREE(xmp, M_UFSMNT); /* XXX */
	164	return (error);
	165	}
	166
	167	/*
	168	* Keep a held reference to the root vnode.
91447636	169	* It is vnode_put'd in nullfs_unmount.
1c79356b A	170	*/
	171	nullm_rootvp = vp;
	172	nullm_rootvp->v_flag \|= VROOT;
	173	xmp->nullm_rootvp = nullm_rootvp;
	174	if (NULLVPTOLOWERVP(nullm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
	175	mp->mnt_flag \|= MNT_LOCAL;
	176	mp->mnt_data = (qaddr_t) xmp;
	177	vfs_getnewfsid(mp);
	178
91447636	179	(void) copyinstr(args.target, mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN - 1,
1c79356b	180	&size);
91447636	181	bzero(mp->mnt_vfsstat.f_mntfromname + size, MNAMELEN - size);
1c79356b A	182	#ifdef NULLFS_DIAGNOSTIC
1c79356b A	183	printf("nullfs_mount: lower %s, alias at %s\n",
91447636	184	mp->mnt_vfsstat.f_mntfromname, mp->mnt_vfsstat.f_mntonname);
1c79356b A	185	#endif
	186	return (0);
	187	}
	188
	189	/*
	190	* VFS start. Nothing needed here - the start routine
	191	* on the underlying filesystem will have been called
	192	* when that filesystem was mounted.
	193	*/
91447636 A	194	static int
91447636 A	195	nullfs_start(mp, flags, context)
1c79356b A	196	struct mount *mp;
1c79356b A	197	int flags;
91447636	198	vfs_context_t context;
1c79356b A	199	{
1c79356b A	200	return (0);
91447636	201	/* return VFS_START(MOUNTTONULLMOUNT(mp)->nullm_vfs, flags, context); */
1c79356b A	202	}
	203
	204	/*
	205	* Free reference to null layer
	206	*/
91447636 A	207	static int
91447636 A	208	nullfs_unmount(mp, mntflags, context)
1c79356b A	209	struct mount *mp;
1c79356b A	210	int mntflags;
91447636	211	vfs_context_t context;
1c79356b A	212	{
	213	struct vnode *nullm_rootvp = MOUNTTONULLMOUNT(mp)->nullm_rootvp;
	214	int error;
	215	int flags = 0;
9bccf70c	216	int force = 0;
1c79356b A	217
	218	#ifdef NULLFS_DIAGNOSTIC
	219	printf("nullfs_unmount(mp = %x)\n", mp);
	220	#endif
	221
9bccf70c	222	if (mntflags & MNT_FORCE) {
1c79356b	223	flags \|= FORCECLOSE;
9bccf70c A	224	force = 1;
9bccf70c A	225	}
1c79356b	226
9bccf70c	227	if ( (nullm_rootvp->v_usecount > 1) && !force )
1c79356b	228	return (EBUSY);
9bccf70c	229	if ( (error = vflush(mp, nullm_rootvp, flags)) && !force )
1c79356b A	230	return (error);
	231
	232	#ifdef NULLFS_DIAGNOSTIC
	233	vprint("alias root of lower", nullm_rootvp);
	234	#endif
	235	/*
	236	* Release reference on underlying root vnode
	237	*/
91447636	238	vnode_put(nullm_rootvp);
1c79356b A	239	/*
	240	* And blow it away for future re-use
	241	*/
91447636	242	vnode_reclaim(nullm_rootvp);
1c79356b A	243	/*
	244	* Finally, throw away the null_mount structure
	245	*/
	246	FREE(mp->mnt_data, M_UFSMNT); /* XXX */
	247	mp->mnt_data = 0;
	248	return 0;
	249	}
	250
91447636 A	251	static int
91447636 A	252	nullfs_root(mp, vpp, context)
1c79356b A	253	struct mount *mp;
1c79356b A	254	struct vnode **vpp;
91447636	255	vfs_context_t context;
1c79356b A	256	{
	257	struct proc p = curproc; / XXX */
	258	struct vnode *vp;
	259
	260	#ifdef NULLFS_DIAGNOSTIC
	261	printf("nullfs_root(mp = %x, vp = %x->%x)\n", mp,
	262	MOUNTTONULLMOUNT(mp)->nullm_rootvp,
	263	NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp)
	264	);
	265	#endif
	266
	267	/*
	268	* Return locked reference to root.
	269	*/
	270	vp = MOUNTTONULLMOUNT(mp)->nullm_rootvp;
91447636	271	vnode_get(vp);
1c79356b A	272	*vpp = vp;
	273	return 0;
	274	}
	275
91447636 A	276	static int
91447636 A	277	nullfs_quotactl(mp, cmd, uid, datap, context)
1c79356b A	278	struct mount *mp;
	279	int cmd;
	280	uid_t uid;
91447636 A	281	caddr_t datap;
91447636 A	282	vfs_context_t context;
1c79356b	283	{
91447636	284	return VFS_QUOTACTL(MOUNTTONULLMOUNT(mp)->nullm_vfs, cmd, uid, datap, context);
1c79356b A	285	}
1c79356b A	286
91447636 A	287	static int
91447636 A	288	nullfs_statfs(mp, sbp, context)
1c79356b	289	struct mount *mp;
91447636 A	290	struct vfsstatfs *sbp;
91447636 A	291	vfs_context_t context;
1c79356b A	292	{
1c79356b A	293	int error;
91447636	294	struct vfsstatfs mstat;
1c79356b A	295
	296	#ifdef NULLFS_DIAGNOSTIC
	297	printf("nullfs_statfs(mp = %x, vp = %x->%x)\n", mp,
	298	MOUNTTONULLMOUNT(mp)->nullm_rootvp,
	299	NULLVPTOLOWERVP(MOUNTTONULLMOUNT(mp)->nullm_rootvp)
	300	);
	301	#endif
	302
	303	bzero(&mstat, sizeof(mstat));
	304
91447636	305	error = VFS_STATFS(MOUNTTONULLMOUNT(mp)->nullm_vfs, &mstat, context);
1c79356b A	306	if (error)
	307	return (error);
	308
	309	/* now copy across the "interesting" information and fake the rest */
91447636	310	//sbp->f_type = mstat.f_type;
1c79356b A	311	sbp->f_flags = mstat.f_flags;
	312	sbp->f_bsize = mstat.f_bsize;
	313	sbp->f_iosize = mstat.f_iosize;
	314	sbp->f_blocks = mstat.f_blocks;
	315	sbp->f_bfree = mstat.f_bfree;
	316	sbp->f_bavail = mstat.f_bavail;
	317	sbp->f_files = mstat.f_files;
	318	sbp->f_ffree = mstat.f_ffree;
1c79356b A	319	return (0);
	320	}
	321
91447636 A	322	static int
	323	nullfs_sync(__unused struct mount *mp, __unused int waitfor,
	324	__unused kauth_cred_t cred, __unused vfs_context_t context)
1c79356b A	325	{
	326	/*
	327	* XXX - Assumes no data cached at null layer.
	328	*/
	329	return (0);
	330	}
	331
91447636 A	332	static int
91447636 A	333	nullfs_vget(mp, ino, vpp, context)
1c79356b	334	struct mount *mp;
91447636	335	ino64_t ino;
1c79356b	336	struct vnode **vpp;
91447636	337	vfs_context_t context;
1c79356b A	338	{
1c79356b A	339
91447636	340	return VFS_VGET(MOUNTTONULLMOUNT(mp)->nullm_vfs, ino, vpp, context);
1c79356b A	341	}
1c79356b A	342
91447636 A	343	static int
91447636 A	344	nullfs_fhtovp(mp, fhlen, fhp, vpp, context)
1c79356b	345	struct mount *mp;
91447636 A	346	int fhlen;
91447636 A	347	unsigned char *fhp;
1c79356b	348	struct vnode **vpp;
91447636	349	vfs_context_t context;
1c79356b A	350	{
1c79356b A	351
91447636	352	return VFS_FHTOVP(MOUNTTONULLMOUNT(mp)->nullm_vfs, fhlen, fhp, vpp, context);
1c79356b A	353	}
1c79356b A	354
91447636 A	355	static int
91447636 A	356	nullfs_vptofh(vp, fhlenp, fhp, context)
1c79356b	357	struct vnode *vp;
91447636 A	358	int *fhlenp;
	359	unsigned char *fhp;
	360	vfs_context_t context;
1c79356b	361	{
91447636	362	return VFS_VPTOFH(NULLVPTOLOWERVP(vp), fhlenp, fhp, context);
1c79356b A	363	}
1c79356b A	364
91447636	365	int nullfs_init (struct vfsconf *);
1c79356b	366
91447636	367	#define nullfs_sysctl (int () (int , u_int, user_addr_t, size_t *, user_addr_t, size_t, proc_t))eopnotsupp
1c79356b A	368
	369	struct vfsops null_vfsops = {
	370	nullfs_mount,
	371	nullfs_start,
	372	nullfs_unmount,
	373	nullfs_root,
	374	nullfs_quotactl,
	375	nullfs_statfs,
	376	nullfs_sync,
	377	nullfs_vget,
	378	nullfs_fhtovp,
	379	nullfs_vptofh,
	380	nullfs_init,
91447636	381	nullfs_sysctl
1c79356b	382	};