[apple/xnu.git] / bsd / ufs / mfs / mfs_vnops.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*	$NetBSD: mfs_vnops.c,v 1.5 1994/12/14 13:03:52 mycroft Exp $	*/

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 *
 *	@(#)mfs_vnops.c	8.5 (Berkeley) 7/28/94
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/map.h>
#include <sys/vnode.h>
#include <sys/malloc.h>

#include <miscfs/specfs/specdev.h>

#include <machine/vmparam.h>

#include <ufs/mfs/mfsnode.h>
#include <ufs/mfs/mfsiom.h>
#include <ufs/mfs/mfs_extern.h>

/*
 * mfs vnode operations.
 */

#define VOPFUNC int (*)(void *)

int (**mfs_vnodeop_p)(void *);
struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
	{ &vop_default_desc, (VOPFUNC)vn_default_error },
	{ &vop_lookup_desc, (VOPFUNC)mfs_lookup },		/* lookup */
	{ &vop_create_desc, (VOPFUNC)mfs_create },		/* create */
	{ &vop_mknod_desc, (VOPFUNC)mfs_mknod },		/* mknod */
	{ &vop_open_desc, (VOPFUNC)mfs_open },			/* open */
	{ &vop_close_desc, (VOPFUNC)mfs_close },		/* close */
	{ &vop_access_desc, (VOPFUNC)mfs_access },		/* access */
	{ &vop_getattr_desc, (VOPFUNC)mfs_getattr },		/* getattr */
	{ &vop_setattr_desc, (VOPFUNC)mfs_setattr },		/* setattr */
	{ &vop_read_desc, (VOPFUNC)mfs_read },			/* read */
	{ &vop_write_desc, (VOPFUNC)mfs_write },		/* write */
	{ &vop_ioctl_desc, (VOPFUNC)mfs_ioctl },		/* ioctl */
	{ &vop_select_desc, (VOPFUNC)mfs_select },		/* select */
	{ &vop_mmap_desc, (VOPFUNC)mfs_mmap },			/* mmap */
	{ &vop_fsync_desc, (VOPFUNC)spec_fsync },		/* fsync */
	{ &vop_seek_desc, (VOPFUNC)mfs_seek },			/* seek */
	{ &vop_remove_desc, (VOPFUNC)mfs_remove },		/* remove */
	{ &vop_link_desc, (VOPFUNC)mfs_link },			/* link */
	{ &vop_rename_desc, (VOPFUNC)mfs_rename },		/* rename */
	{ &vop_mkdir_desc, (VOPFUNC)mfs_mkdir },		/* mkdir */
	{ &vop_rmdir_desc, (VOPFUNC)mfs_rmdir },		/* rmdir */
	{ &vop_symlink_desc, (VOPFUNC)mfs_symlink },		/* symlink */
	{ &vop_readdir_desc, (VOPFUNC)mfs_readdir },		/* readdir */
	{ &vop_readlink_desc, (VOPFUNC)mfs_readlink },		/* readlink */
	{ &vop_abortop_desc, (VOPFUNC)mfs_abortop },		/* abortop */
	{ &vop_inactive_desc, (VOPFUNC)mfs_inactive },		/* inactive */
	{ &vop_reclaim_desc, (VOPFUNC)mfs_reclaim },		/* reclaim */
	{ &vop_lock_desc, (VOPFUNC)mfs_lock },			/* lock */
	{ &vop_unlock_desc, (VOPFUNC)mfs_unlock },		/* unlock */
	{ &vop_bmap_desc, (VOPFUNC)mfs_bmap },			/* bmap */
	{ &vop_strategy_desc, (VOPFUNC)mfs_strategy },		/* strategy */
	{ &vop_print_desc, (VOPFUNC)mfs_print },		/* print */
	{ &vop_islocked_desc, (VOPFUNC)mfs_islocked },		/* islocked */
	{ &vop_pathconf_desc, (VOPFUNC)mfs_pathconf },		/* pathconf */
	{ &vop_advlock_desc, (VOPFUNC)mfs_advlock },		/* advlock */
	{ &vop_blkatoff_desc, (VOPFUNC)mfs_blkatoff },		/* blkatoff */
	{ &vop_valloc_desc, (VOPFUNC)mfs_valloc },		/* valloc */
	{ &vop_vfree_desc, (VOPFUNC)mfs_vfree },		/* vfree */
	{ &vop_truncate_desc, (VOPFUNC)mfs_truncate },		/* truncate */
	{ &vop_update_desc, (VOPFUNC)mfs_update },		/* update */
	{ &vop_bwrite_desc, (VOPFUNC)mfs_bwrite },		/* bwrite */
	{ &vop_pgrd_desc, (VOPFUNC)mfs_pgrg },			/* pager read */
	{ &vop_pgwr_desc, (VOPFUNC)mfs_pgwr },			/* pager write */
	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc mfs_vnodeop_opv_desc =
	{ &mfs_vnodeop_p, mfs_vnodeop_entries };

/*
 * Vnode Operations.
 *
 * Open called to allow memory filesystem to initialize and
 * validate before actual IO. Record our process identifier
 * so we can tell when we are doing I/O to ourself.
 */
/* ARGSUSED */
int
mfs_open(ap)
	struct vop_open_args /* {
		struct vnode *a_vp;
		int  a_mode;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{

	if (ap->a_vp->v_type != VBLK) {
		panic("mfs_ioctl not VBLK");
		/* NOTREACHED */
	}
	return (0);
}

/*
 * Ioctl operation.
 */
/* ARGSUSED */
int
mfs_ioctl(ap)
	struct vop_ioctl_args /* {
		struct vnode *a_vp;
		u_long a_command;
		caddr_t  a_data;
		int  a_fflag;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{

	return (ENOTTY);
}

/*
 * Pass I/O requests to the memory filesystem process.
 */
int
mfs_strategy(ap)
	struct vop_strategy_args /* {
		struct buf *a_bp;
	} */ *ap;
{
	register struct buf *bp = ap->a_bp;
	register struct mfsnode *mfsp;
	struct vnode *vp;
	struct proc *p = curproc;		/* XXX */

	if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0)
		panic("mfs_strategy: bad dev");
	mfsp = VTOMFS(vp);
	/* check for mini-root access */
	if (mfsp->mfs_pid == 0) {
		caddr_t base;

		base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
		if (bp->b_flags & B_READ)
			bcopy(base, bp->b_data, bp->b_bcount);
		else
			bcopy(bp->b_data, base, bp->b_bcount);
		biodone(bp);
	} else if (mfsp->mfs_pid == p->p_pid) {
		mfs_doio(bp, mfsp->mfs_baseoff);
	} else {
		bp->b_actf = mfsp->mfs_buflist;
		mfsp->mfs_buflist = bp;
		wakeup((caddr_t)vp);
	}
	return (0);
}

/*
 * Memory file system I/O.
 *
 * Trivial on the HP since buffer has already been mapping into KVA space.
 */
void
mfs_doio(bp, base)
	register struct buf *bp;
	caddr_t base;
{

	base += (bp->b_blkno << DEV_BSHIFT);
	if (bp->b_flags & B_READ)
		bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
	else
		bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
	if (bp->b_error)
		bp->b_flags |= B_ERROR;
	biodone(bp);
}

/*
 * This is a noop, simply returning what one has been given.
 */
int
mfs_bmap(ap)
	struct vop_bmap_args /* {
		struct vnode *a_vp;
		daddr_t  a_bn;
		struct vnode **a_vpp;
		daddr_t *a_bnp;
		int *a_runp;
	} */ *ap;
{

	if (ap->a_vpp != NULL)
		*ap->a_vpp = ap->a_vp;
	if (ap->a_bnp != NULL)
		*ap->a_bnp = ap->a_bn;
	return (0);
}

/*
 * Memory filesystem close routine
 */
/* ARGSUSED */
int
mfs_close(ap)
	struct vop_close_args /* {
		struct vnode *a_vp;
		int  a_fflag;
		struct ucred *a_cred;
		struct proc *a_p;
	} */ *ap;
{
	register struct vnode *vp = ap->a_vp;
	register struct mfsnode *mfsp = VTOMFS(vp);
	register struct buf *bp;
	int error;

	/*
	 * Finish any pending I/O requests.
	 */
	while (bp = mfsp->mfs_buflist) {
		mfsp->mfs_buflist = bp->b_actf;
		mfs_doio(bp, mfsp->mfs_baseoff);
		wakeup((caddr_t)bp);
	}
	/*
	 * On last close of a memory filesystem
	 * we must invalidate any in core blocks, so that
	 * we can, free up its vnode.
	 */
	if (error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0))
		return (error);
	/*
	 * There should be no way to have any more uses of this
	 * vnode, so if we find any other uses, it is a panic.
	 */
	if (vp->v_usecount > 1)
		printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
	if (vp->v_usecount > 1 || mfsp->mfs_buflist)
		panic("mfs_close");
	/*
	 * Send a request to the filesystem server to exit.
	 */
	mfsp->mfs_buflist = (struct buf *)(-1);
	wakeup((caddr_t)vp);
	return (0);
}

/*
 * Memory filesystem inactive routine
 */
/* ARGSUSED */
int
mfs_inactive(ap)
	struct vop_inactive_args /* {
		struct vnode *a_vp;
	} */ *ap;
{
	register struct mfsnode *mfsp = VTOMFS(ap->a_vp);

	if (mfsp->mfs_buflist && mfsp->mfs_buflist != (struct buf *)(-1))
		panic("mfs_inactive: not inactive (mfs_buflist %x)",
			mfsp->mfs_buflist);
	return (0);
}

/*
 * Reclaim a memory filesystem devvp so that it can be reused.
 */
int
mfs_reclaim(ap)
	struct vop_reclaim_args /* {
		struct vnode *a_vp;
	} */ *ap;
{
	register struct vnode *vp = ap->a_vp;

	FREE(vp->v_data, M_MFSNODE);
	vp->v_data = NULL;
	return (0);
}

/*
 * Print out the contents of an mfsnode.
 */
int
mfs_print(ap)
	struct vop_print_args /* {
		struct vnode *a_vp;
	} */ *ap;
{
	register struct mfsnode *mfsp = VTOMFS(ap->a_vp);

	printf("tag VT_MFS, pid %d, base %d, size %d\n", mfsp->mfs_pid,
		mfsp->mfs_baseoff, mfsp->mfs_size);
	return (0);
}

/*
 * Block device bad operation
 */
int
mfs_badop()
{

	panic("mfs_badop called\n");
	/* NOTREACHED */
}

/*
 * Memory based filesystem initialization.
 */
mfs_init()
{

}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* $NetBSD: mfs_vnops.c,v 1.5 1994/12/14 13:03:52 mycroft Exp $ */
	23
	24	/*
	25	* Copyright (c) 1989, 1993
	26	* The Regents of the University of California. All rights reserved.
	27	*
	28	* Redistribution and use in source and binary forms, with or without
	29	* modification, are permitted provided that the following conditions
	30	* are met:
	31	* 1. Redistributions of source code must retain the above copyright
	32	* notice, this list of conditions and the following disclaimer.
	33	* 2. Redistributions in binary form must reproduce the above copyright
	34	* notice, this list of conditions and the following disclaimer in the
	35	* documentation and/or other materials provided with the distribution.
	36	* 3. All advertising materials mentioning features or use of this software
	37	* must display the following acknowledgement:
	38	* This product includes software developed by the University of
	39	* California, Berkeley and its contributors.
	40	* 4. Neither the name of the University nor the names of its contributors
	41	* may be used to endorse or promote products derived from this software
	42	* without specific prior written permission.
	43	*
	44	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	45	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	46	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	47	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	48	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	49	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	50	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	51	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	52	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	53	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	54	* SUCH DAMAGE.
	55	*
	56	* @(#)mfs_vnops.c 8.5 (Berkeley) 7/28/94
	57	*/
	58
	59	#include <sys/param.h>
	60	#include <sys/systm.h>
	61	#include <sys/time.h>
	62	#include <sys/kernel.h>
	63	#include <sys/proc.h>
	64	#include <sys/buf.h>
65	#include <sys/map.h>
66	#include <sys/vnode.h>
67	#include <sys/malloc.h>
68
69	#include <miscfs/specfs/specdev.h>
70
71	#include <machine/vmparam.h>
72
73	#include <ufs/mfs/mfsnode.h>
74	#include <ufs/mfs/mfsiom.h>
75	#include <ufs/mfs/mfs_extern.h>
76
77	/*
78	* mfs vnode operations.
79	*/
80
81	#define VOPFUNC int ()(void )
82
83	int (*mfs_vnodeop_p)(void );
84	struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
85	{ &vop_default_desc, (VOPFUNC)vn_default_error },
86	{ &vop_lookup_desc, (VOPFUNC)mfs_lookup }, /* lookup */
87	{ &vop_create_desc, (VOPFUNC)mfs_create }, /* create */
88	{ &vop_mknod_desc, (VOPFUNC)mfs_mknod }, /* mknod */
89	{ &vop_open_desc, (VOPFUNC)mfs_open }, /* open */
90	{ &vop_close_desc, (VOPFUNC)mfs_close }, /* close */
91	{ &vop_access_desc, (VOPFUNC)mfs_access }, /* access */
92	{ &vop_getattr_desc, (VOPFUNC)mfs_getattr }, /* getattr */
93	{ &vop_setattr_desc, (VOPFUNC)mfs_setattr }, /* setattr */
94	{ &vop_read_desc, (VOPFUNC)mfs_read }, /* read */
95	{ &vop_write_desc, (VOPFUNC)mfs_write }, /* write */
96	{ &vop_ioctl_desc, (VOPFUNC)mfs_ioctl }, /* ioctl */
97	{ &vop_select_desc, (VOPFUNC)mfs_select }, /* select */
98	{ &vop_mmap_desc, (VOPFUNC)mfs_mmap }, /* mmap */
99	{ &vop_fsync_desc, (VOPFUNC)spec_fsync }, /* fsync */
100	{ &vop_seek_desc, (VOPFUNC)mfs_seek }, /* seek */
101	{ &vop_remove_desc, (VOPFUNC)mfs_remove }, /* remove */
102	{ &vop_link_desc, (VOPFUNC)mfs_link }, /* link */
103	{ &vop_rename_desc, (VOPFUNC)mfs_rename }, /* rename */
104	{ &vop_mkdir_desc, (VOPFUNC)mfs_mkdir }, /* mkdir */
105	{ &vop_rmdir_desc, (VOPFUNC)mfs_rmdir }, /* rmdir */
106	{ &vop_symlink_desc, (VOPFUNC)mfs_symlink }, /* symlink */
107	{ &vop_readdir_desc, (VOPFUNC)mfs_readdir }, /* readdir */
108	{ &vop_readlink_desc, (VOPFUNC)mfs_readlink }, /* readlink */
109	{ &vop_abortop_desc, (VOPFUNC)mfs_abortop }, /* abortop */
110	{ &vop_inactive_desc, (VOPFUNC)mfs_inactive }, /* inactive */
111	{ &vop_reclaim_desc, (VOPFUNC)mfs_reclaim }, /* reclaim */
112	{ &vop_lock_desc, (VOPFUNC)mfs_lock }, /* lock */
113	{ &vop_unlock_desc, (VOPFUNC)mfs_unlock }, /* unlock */
114	{ &vop_bmap_desc, (VOPFUNC)mfs_bmap }, /* bmap */
115	{ &vop_strategy_desc, (VOPFUNC)mfs_strategy }, /* strategy */
116	{ &vop_print_desc, (VOPFUNC)mfs_print }, /* print */
117	{ &vop_islocked_desc, (VOPFUNC)mfs_islocked }, /* islocked */
118	{ &vop_pathconf_desc, (VOPFUNC)mfs_pathconf }, /* pathconf */
119	{ &vop_advlock_desc, (VOPFUNC)mfs_advlock }, /* advlock */
120	{ &vop_blkatoff_desc, (VOPFUNC)mfs_blkatoff }, /* blkatoff */
121	{ &vop_valloc_desc, (VOPFUNC)mfs_valloc }, /* valloc */
122	{ &vop_vfree_desc, (VOPFUNC)mfs_vfree }, /* vfree */
123	{ &vop_truncate_desc, (VOPFUNC)mfs_truncate }, /* truncate */
124	{ &vop_update_desc, (VOPFUNC)mfs_update }, /* update */
125	{ &vop_bwrite_desc, (VOPFUNC)mfs_bwrite }, /* bwrite */
126	{ &vop_pgrd_desc, (VOPFUNC)mfs_pgrg }, /* pager read */
127	{ &vop_pgwr_desc, (VOPFUNC)mfs_pgwr }, /* pager write */
128	{ (struct vnodeop_desc)NULL, (int()())NULL }
129	};
130	struct vnodeopv_desc mfs_vnodeop_opv_desc =
131	{ &mfs_vnodeop_p, mfs_vnodeop_entries };
132
133	/*
134	* Vnode Operations.
135	*
136	* Open called to allow memory filesystem to initialize and
137	* validate before actual IO. Record our process identifier
138	* so we can tell when we are doing I/O to ourself.
139	*/
140	/* ARGSUSED */
141	int
142	mfs_open(ap)
143	struct vop_open_args /* {
144	struct vnode *a_vp;
145	int a_mode;
146	struct ucred *a_cred;
147	struct proc *a_p;
148	} / ap;
149	{
150
151	if (ap->a_vp->v_type != VBLK) {
152	panic("mfs_ioctl not VBLK");
153	/* NOTREACHED */
154	}
155	return (0);
156	}
157
158	/*
159	* Ioctl operation.
160	*/
161	/* ARGSUSED */
162	int
163	mfs_ioctl(ap)
164	struct vop_ioctl_args /* {
165	struct vnode *a_vp;
166	u_long a_command;
167	caddr_t a_data;
168	int a_fflag;
169	struct ucred *a_cred;
170	struct proc *a_p;
171	} / ap;
172	{
173
174	return (ENOTTY);
175	}
176
177	/*
178	* Pass I/O requests to the memory filesystem process.
179	*/
180	int
181	mfs_strategy(ap)
182	struct vop_strategy_args /* {
183	struct buf *a_bp;
184	} / ap;
185	{
186	register struct buf *bp = ap->a_bp;
187	register struct mfsnode *mfsp;
188	struct vnode *vp;
189	struct proc p = curproc; / XXX */
190
191	if (!vfinddev(bp->b_dev, VBLK, &vp) \|\| vp->v_usecount == 0)
192	panic("mfs_strategy: bad dev");
193	mfsp = VTOMFS(vp);
194	/* check for mini-root access */
195	if (mfsp->mfs_pid == 0) {
196	caddr_t base;
197
198	base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
199	if (bp->b_flags & B_READ)
200	bcopy(base, bp->b_data, bp->b_bcount);
201	else
202	bcopy(bp->b_data, base, bp->b_bcount);
203	biodone(bp);
204	} else if (mfsp->mfs_pid == p->p_pid) {
205	mfs_doio(bp, mfsp->mfs_baseoff);
206	} else {
207	bp->b_actf = mfsp->mfs_buflist;
208	mfsp->mfs_buflist = bp;
209	wakeup((caddr_t)vp);
210	}
211	return (0);
212	}
213
214	/*
215	* Memory file system I/O.
216	*
217	* Trivial on the HP since buffer has already been mapping into KVA space.
218	*/
219	void
220	mfs_doio(bp, base)
221	register struct buf *bp;
222	caddr_t base;
223	{
224
225	base += (bp->b_blkno << DEV_BSHIFT);
226	if (bp->b_flags & B_READ)
227	bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
228	else
229	bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
230	if (bp->b_error)
231	bp->b_flags \|= B_ERROR;
232	biodone(bp);
233	}
234
235	/*
236	* This is a noop, simply returning what one has been given.
237	*/
238	int
239	mfs_bmap(ap)
240	struct vop_bmap_args /* {
241	struct vnode *a_vp;
242	daddr_t a_bn;
243	struct vnode **a_vpp;
244	daddr_t *a_bnp;
245	int *a_runp;
246	} / ap;
247	{
248
249	if (ap->a_vpp != NULL)
250	*ap->a_vpp = ap->a_vp;
251	if (ap->a_bnp != NULL)
252	*ap->a_bnp = ap->a_bn;
253	return (0);
254	}
255
256	/*
257	* Memory filesystem close routine
258	*/
259	/* ARGSUSED */
260	int
261	mfs_close(ap)
262	struct vop_close_args /* {
263	struct vnode *a_vp;
264	int a_fflag;
265	struct ucred *a_cred;
266	struct proc *a_p;
267	} / ap;
268	{
269	register struct vnode *vp = ap->a_vp;
270	register struct mfsnode *mfsp = VTOMFS(vp);
271	register struct buf *bp;
272	int error;
273
274	/*
275	* Finish any pending I/O requests.
276	*/
277	while (bp = mfsp->mfs_buflist) {
278	mfsp->mfs_buflist = bp->b_actf;
279	mfs_doio(bp, mfsp->mfs_baseoff);
280	wakeup((caddr_t)bp);
281	}
282	/*
283	* On last close of a memory filesystem
284	* we must invalidate any in core blocks, so that
285	* we can, free up its vnode.
286	*/
287	if (error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0))
288	return (error);
289	/*
290	* There should be no way to have any more uses of this
291	* vnode, so if we find any other uses, it is a panic.
292	*/
293	if (vp->v_usecount > 1)
294	printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
295	if (vp->v_usecount > 1 \|\| mfsp->mfs_buflist)
296	panic("mfs_close");
297	/*
298	* Send a request to the filesystem server to exit.
299	*/
300	mfsp->mfs_buflist = (struct buf *)(-1);
301	wakeup((caddr_t)vp);
302	return (0);
303	}
304
305	/*
306	* Memory filesystem inactive routine
307	*/
308	/* ARGSUSED */
309	int
310	mfs_inactive(ap)
311	struct vop_inactive_args /* {
312	struct vnode *a_vp;
313	} / ap;
314	{
315	register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
316
317	if (mfsp->mfs_buflist && mfsp->mfs_buflist != (struct buf *)(-1))
318	panic("mfs_inactive: not inactive (mfs_buflist %x)",
319	mfsp->mfs_buflist);
320	return (0);
321	}
322
323	/*
324	* Reclaim a memory filesystem devvp so that it can be reused.
325	*/
326	int
327	mfs_reclaim(ap)
328	struct vop_reclaim_args /* {
329	struct vnode *a_vp;
330	} / ap;
331	{
332	register struct vnode *vp = ap->a_vp;
333
334	FREE(vp->v_data, M_MFSNODE);
335	vp->v_data = NULL;
336	return (0);
337	}
338
339	/*
340	* Print out the contents of an mfsnode.
341	*/
342	int
343	mfs_print(ap)
344	struct vop_print_args /* {
345	struct vnode *a_vp;
346	} / ap;
347	{
348	register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
349
350	printf("tag VT_MFS, pid %d, base %d, size %d\n", mfsp->mfs_pid,
351	mfsp->mfs_baseoff, mfsp->mfs_size);
352	return (0);
353	}
354
355	/*
356	* Block device bad operation
357	*/
358	int
359	mfs_badop()
360	{
361
362	panic("mfs_badop called\n");
363	/* NOTREACHED */
364	}
365
366	/*
367	* Memory based filesystem initialization.
368	*/
369	mfs_init()
370	{
371
372	}