[apple/xnu.git] / bsd / ufs / mfs / mfs_vfsops.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@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1989, 1990, 1993, 1994
 *	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_vfsops.c	8.4 (Berkeley) 4/16/94
 */

#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/mount.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <sys/malloc.h>

#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>

#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>

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

caddr_t	mfs_rootbase;	/* address of mini-root in kernel virtual memory */
u_long	mfs_rootsize;	/* size of mini-root in bytes */

static	int mfs_minor;	/* used for building internal dev_t */

extern int (**mfs_vnodeop_p)(void *);

/*
 * mfs vfs operations.
 */
struct vfsops mfs_vfsops = {
	MOUNT_MFS,
	mfs_mount,
	mfs_start,
	ffs_unmount,
	ufs_root,
	ufs_quotactl,
	mfs_statfs,
	ffs_sync,
	ffs_vget,
	ffs_fhtovp,
	ffs_vptofh,
	mfs_init,
};

/*
 * Called by main() when mfs is going to be mounted as root.
 *
 * Name is updated by mount(8) after booting.
 */
#define ROOTNAME	"mfs_root"

mfs_mountroot()
{
	extern struct vnode *rootvp;
	register struct fs *fs;
	register struct mount *mp;
	struct proc *p = kernel_proc;	/* XXX - WMG*/
	struct ufsmount *ump;
	struct mfsnode *mfsp;
	size_t size;
	int error;

	/*
	 * Get vnodes for swapdev and rootdev.
	 */
#if 0
	if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
		panic("mfs_mountroot: can't setup bdevvp's");
#else
	if ( bdevvp(rootdev, &rootvp))
		panic("mfs_mountroot: can't setup bdevvp's");

#endif
	MALLOC_ZONE(mp, struct mount *,
			sizeof(struct mount), M_MOUNT, M_WAITOK);
	bzero((char *)mp, (u_long)sizeof(struct mount));

    /* Initialize the default IO constraints */
    mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
    mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;

	mp->mnt_op = &mfs_vfsops;
	mp->mnt_flag = MNT_RDONLY;
	MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
	rootvp->v_data = mfsp;
	rootvp->v_op = mfs_vnodeop_p;
	rootvp->v_tag = VT_MFS;
	mfsp->mfs_baseoff = mfs_rootbase;
	mfsp->mfs_size = mfs_rootsize;
	mfsp->mfs_vnode = rootvp;
	mfsp->mfs_pid = p->p_pid;
	mfsp->mfs_buflist = (struct buf *)0;
	if (error = ffs_mountfs(rootvp, mp, p)) {
		vrele(rootvp); /* release the reference from bdevvp() */
		_FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
		_FREE(mfsp, M_MFSNODE);
		return (error);
	}
	if (error = vfs_lock(mp)) {
		(void)ffs_unmount(mp, 0, p);
		_FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
		_FREE(mfsp, M_MFSNODE);
		return (error);
	}
	CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
	mp->mnt_vnodecovered = NULLVP;
	ump = VFSTOUFS(mp);
	fs = ump->um_fs;
	bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
	fs->fs_fsmnt[0] = '/';
	bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
	(void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
	    &size);
	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
	(void)ffs_statfs(mp, &mp->mnt_stat, p);
	vfs_unlock(mp);
	inittodr((time_t)0);
	return (0);
}

/*
 * This is called early in boot to set the base address and size
 * of the mini-root.
 */
mfs_initminiroot(base)
	caddr_t base;
{
	struct fs *fs = (struct fs *)(base + SBOFF);
	extern int (*mountroot)();

	/* check for valid super block */
	if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
	    fs->fs_bsize < sizeof(struct fs))
		return (0);
	mountroot = mfs_mountroot;
	mfs_rootbase = base;
	mfs_rootsize = fs->fs_fsize * fs->fs_size;
	rootdev = makedev(255, mfs_minor++);
	return (mfs_rootsize);
}

/*
 * VFS Operations.
 *
 * mount system call
 */
/* ARGSUSED */
int
mfs_mount(mp, path, data, ndp, p)
	register struct mount *mp;
	char *path;
	caddr_t data;
	struct nameidata *ndp;
	struct proc *p;
{
	struct vnode *devvp;
	struct mfs_args args;
	struct ufsmount *ump;
	register struct fs *fs;
	register struct mfsnode *mfsp;
	size_t size;
	int flags, error;

	if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
		return (error);

	/*
	 * If updating, check whether changing from read-only to
	 * read/write; if there is no device name, that's all we do.
	 */
	if (mp->mnt_flag & MNT_UPDATE) {
		ump = VFSTOUFS(mp);
		fs = ump->um_fs;
		if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
			flags = WRITECLOSE;
			if (mp->mnt_flag & MNT_FORCE)
				flags |= FORCECLOSE;
			if (vfs_busy(mp))
				return (EBUSY);
			error = ffs_flushfiles(mp, flags, p);
			vfs_unbusy(mp);
			if (error)
				return (error);
		}
		if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
			fs->fs_ronly = 0;
#ifdef EXPORTMFS
		if (args.fspec == 0)
			return (vfs_export(mp, &ump->um_export, &args.export));
#endif
		return (0);
	}
	MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
	error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
	if (error) {
		FREE(mfsp, M_MFSNODE);
		return (error);
	}
	devvp->v_type = VBLK;
	if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
		panic("mfs_mount: dup dev");
	devvp->v_data = mfsp;
	mfsp->mfs_baseoff = args.base;
	mfsp->mfs_size = args.size;
	mfsp->mfs_vnode = devvp;
	mfsp->mfs_pid = p->p_pid;
	mfsp->mfs_buflist = (struct buf *)0;
	if (error = ffs_mountfs(devvp, mp, p)) {
		mfsp->mfs_buflist = (struct buf *)-1;
		vrele(devvp);
		return (error);
	}
	ump = VFSTOUFS(mp);
	fs = ump->um_fs;
	(void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
	bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
	bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
	(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
	    &size);
	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
	return (0);
}

int	mfs_pri = PWAIT | PCATCH;		/* XXX prob. temp */

/*
 * Used to grab the process and keep it in the kernel to service
 * memory filesystem I/O requests.
 *
 * Loop servicing I/O requests.
 * Copy the requested data into or out of the memory filesystem
 * address space.
 */
/* ARGSUSED */
int
mfs_start(mp, flags, p)
	struct mount *mp;
	int flags;
	struct proc *p;
{
	register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
	register struct mfsnode *mfsp = VTOMFS(vp);
	register struct buf *bp;
	register caddr_t base;
	int error = 0;

	base = mfsp->mfs_baseoff;
	while (mfsp->mfs_buflist != (struct buf *)(-1)) {
		while (bp = mfsp->mfs_buflist) {
			mfsp->mfs_buflist = bp->b_actf;
			mfs_doio(bp, base);
			wakeup((caddr_t)bp);
		}
		/*
		 * If a non-ignored signal is received, try to unmount.
		 * If that fails, clear the signal (it has been "processed"),
		 * otherwise we will loop here, as tsleep will always return
		 * EINTR/ERESTART.
		 */
		if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
			if (dounmount(mp, 0, p) != 0)
				CLRSIG(p, CURSIG(p));
	}
	return (error);
}

/*
 * Get file system statistics.
 */
mfs_statfs(mp, sbp, p)
	struct mount *mp;
	struct statfs *sbp;
	struct proc *p;
{
	int error;

	error = ffs_statfs(mp, sbp, p);
#ifdef COMPAT_09
	sbp->f_type = 3;
#else
	sbp->f_type = 0;
#endif
	strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN);
	sbp->f_fstypename[MFSNAMELEN] = '\0';
	return (error);
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
de355530 A	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.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 A	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.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	23	/*
	24	* Copyright (c) 1989, 1990, 1993, 1994
	25	* The Regents of the University of California. All rights reserved.
	26	*
	27	* Redistribution and use in source and binary forms, with or without
	28	* modification, are permitted provided that the following conditions
	29	* are met:
	30	* 1. Redistributions of source code must retain the above copyright
	31	* notice, this list of conditions and the following disclaimer.
	32	* 2. Redistributions in binary form must reproduce the above copyright
	33	* notice, this list of conditions and the following disclaimer in the
	34	* documentation and/or other materials provided with the distribution.
	35	* 3. All advertising materials mentioning features or use of this software
	36	* must display the following acknowledgement:
	37	* This product includes software developed by the University of
	38	* California, Berkeley and its contributors.
	39	* 4. Neither the name of the University nor the names of its contributors
	40	* may be used to endorse or promote products derived from this software
	41	* without specific prior written permission.
	42	*
	43	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	44	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	45	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	46	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	47	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	48	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	49	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	50	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	51	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	52	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	53	* SUCH DAMAGE.
	54	*
	55	* @(#)mfs_vfsops.c 8.4 (Berkeley) 4/16/94
	56	*/
	57
	58	#include <sys/param.h>
	59	#include <sys/systm.h>
	60	#include <sys/time.h>
	61	#include <sys/kernel.h>
	62	#include <sys/proc.h>
	63	#include <sys/buf.h>
	64	#include <sys/mount.h>
	65	#include <sys/signalvar.h>
	66	#include <sys/vnode.h>
	67	#include <sys/malloc.h>
	68
	69	#include <ufs/ufs/quota.h>
	70	#include <ufs/ufs/inode.h>
	71	#include <ufs/ufs/ufsmount.h>
	72	#include <ufs/ufs/ufs_extern.h>
	73
	74	#include <ufs/ffs/fs.h>
	75	#include <ufs/ffs/ffs_extern.h>
	76
	77	#include <ufs/mfs/mfsnode.h>
	78	#include <ufs/mfs/mfs_extern.h>
	79
	80	caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */
	81	u_long mfs_rootsize; /* size of mini-root in bytes */
	82
83	static int mfs_minor; /* used for building internal dev_t */
84
85	extern int (*mfs_vnodeop_p)(void );
86
87	/*
88	* mfs vfs operations.
89	*/
90	struct vfsops mfs_vfsops = {
91	MOUNT_MFS,
92	mfs_mount,
93	mfs_start,
94	ffs_unmount,
95	ufs_root,
96	ufs_quotactl,
97	mfs_statfs,
98	ffs_sync,
99	ffs_vget,
100	ffs_fhtovp,
101	ffs_vptofh,
102	mfs_init,
103	};
104
105	/*
106	* Called by main() when mfs is going to be mounted as root.
107	*
108	* Name is updated by mount(8) after booting.
109	*/
110	#define ROOTNAME "mfs_root"
111
112	mfs_mountroot()
113	{
114	extern struct vnode *rootvp;
115	register struct fs *fs;
116	register struct mount *mp;
117	struct proc p = kernel_proc; / XXX - WMG*/
118	struct ufsmount *ump;
119	struct mfsnode *mfsp;
120	size_t size;
121	int error;
122
123	/*
124	* Get vnodes for swapdev and rootdev.
125	*/
126	#if 0
127	if (bdevvp(swapdev, &swapdev_vp) \|\| bdevvp(rootdev, &rootvp))
128	panic("mfs_mountroot: can't setup bdevvp's");
129	#else
130	if ( bdevvp(rootdev, &rootvp))
131	panic("mfs_mountroot: can't setup bdevvp's");
132
133	#endif
134	MALLOC_ZONE(mp, struct mount *,
135	sizeof(struct mount), M_MOUNT, M_WAITOK);
136	bzero((char *)mp, (u_long)sizeof(struct mount));
0b4e3aa0 A	137
	138	/* Initialize the default IO constraints */
	139	mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
	140	mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
	141
1c79356b A	142	mp->mnt_op = &mfs_vfsops;
	143	mp->mnt_flag = MNT_RDONLY;
	144	MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
	145	rootvp->v_data = mfsp;
	146	rootvp->v_op = mfs_vnodeop_p;
	147	rootvp->v_tag = VT_MFS;
	148	mfsp->mfs_baseoff = mfs_rootbase;
	149	mfsp->mfs_size = mfs_rootsize;
	150	mfsp->mfs_vnode = rootvp;
	151	mfsp->mfs_pid = p->p_pid;
	152	mfsp->mfs_buflist = (struct buf *)0;
	153	if (error = ffs_mountfs(rootvp, mp, p)) {
9bccf70c	154	vrele(rootvp); /* release the reference from bdevvp() */
1c79356b A	155	_FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
	156	_FREE(mfsp, M_MFSNODE);
	157	return (error);
	158	}
	159	if (error = vfs_lock(mp)) {
	160	(void)ffs_unmount(mp, 0, p);
	161	_FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
	162	_FREE(mfsp, M_MFSNODE);
	163	return (error);
	164	}
	165	CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
	166	mp->mnt_vnodecovered = NULLVP;
	167	ump = VFSTOUFS(mp);
	168	fs = ump->um_fs;
	169	bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
	170	fs->fs_fsmnt[0] = '/';
	171	bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
	172	(void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
	173	&size);
	174	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
	175	(void)ffs_statfs(mp, &mp->mnt_stat, p);
	176	vfs_unlock(mp);
	177	inittodr((time_t)0);
	178	return (0);
	179	}
	180
	181	/*
	182	* This is called early in boot to set the base address and size
	183	* of the mini-root.
	184	*/
	185	mfs_initminiroot(base)
	186	caddr_t base;
	187	{
	188	struct fs fs = (struct fs )(base + SBOFF);
	189	extern int (*mountroot)();
	190
	191	/* check for valid super block */
	192	if (fs->fs_magic != FS_MAGIC \|\| fs->fs_bsize > MAXBSIZE \|\|
	193	fs->fs_bsize < sizeof(struct fs))
	194	return (0);
	195	mountroot = mfs_mountroot;
	196	mfs_rootbase = base;
	197	mfs_rootsize = fs->fs_fsize * fs->fs_size;
	198	rootdev = makedev(255, mfs_minor++);
	199	return (mfs_rootsize);
	200	}
	201
	202	/*
	203	* VFS Operations.
	204	*
	205	* mount system call
	206	*/
	207	/* ARGSUSED */
	208	int
	209	mfs_mount(mp, path, data, ndp, p)
	210	register struct mount *mp;
	211	char *path;
	212	caddr_t data;
	213	struct nameidata *ndp;
	214	struct proc *p;
	215	{
	216	struct vnode *devvp;
	217	struct mfs_args args;
	218	struct ufsmount *ump;
219	register struct fs *fs;
220	register struct mfsnode *mfsp;
221	size_t size;
222	int flags, error;
223
224	if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
225	return (error);
226
227	/*
228	* If updating, check whether changing from read-only to
229	* read/write; if there is no device name, that's all we do.
230	*/
231	if (mp->mnt_flag & MNT_UPDATE) {
232	ump = VFSTOUFS(mp);
233	fs = ump->um_fs;
234	if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
235	flags = WRITECLOSE;
236	if (mp->mnt_flag & MNT_FORCE)
237	flags \|= FORCECLOSE;
238	if (vfs_busy(mp))
239	return (EBUSY);
240	error = ffs_flushfiles(mp, flags, p);
241	vfs_unbusy(mp);
242	if (error)
243	return (error);
244	}
245	if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
246	fs->fs_ronly = 0;
247	#ifdef EXPORTMFS
248	if (args.fspec == 0)
249	return (vfs_export(mp, &ump->um_export, &args.export));
250	#endif
251	return (0);
252	}
253	MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
254	error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
255	if (error) {
256	FREE(mfsp, M_MFSNODE);
257	return (error);
258	}
259	devvp->v_type = VBLK;
260	if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
261	panic("mfs_mount: dup dev");
262	devvp->v_data = mfsp;
263	mfsp->mfs_baseoff = args.base;
264	mfsp->mfs_size = args.size;
265	mfsp->mfs_vnode = devvp;
266	mfsp->mfs_pid = p->p_pid;
267	mfsp->mfs_buflist = (struct buf *)0;
268	if (error = ffs_mountfs(devvp, mp, p)) {
269	mfsp->mfs_buflist = (struct buf *)-1;
270	vrele(devvp);
271	return (error);
272	}
273	ump = VFSTOUFS(mp);
274	fs = ump->um_fs;
275	(void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
276	bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
277	bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
278	(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
279	&size);
280	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
281	return (0);
282	}
283
284	int mfs_pri = PWAIT \| PCATCH; /* XXX prob. temp */
285
286	/*
287	* Used to grab the process and keep it in the kernel to service
288	* memory filesystem I/O requests.
289	*
290	* Loop servicing I/O requests.
291	* Copy the requested data into or out of the memory filesystem
292	* address space.
293	*/
294	/* ARGSUSED */
295	int
296	mfs_start(mp, flags, p)
297	struct mount *mp;
298	int flags;
299	struct proc *p;
300	{
301	register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
302	register struct mfsnode *mfsp = VTOMFS(vp);
303	register struct buf *bp;
304	register caddr_t base;
305	int error = 0;
306
307	base = mfsp->mfs_baseoff;
308	while (mfsp->mfs_buflist != (struct buf *)(-1)) {
309	while (bp = mfsp->mfs_buflist) {
310	mfsp->mfs_buflist = bp->b_actf;
311	mfs_doio(bp, base);
312	wakeup((caddr_t)bp);
313	}
314	/*
315	* If a non-ignored signal is received, try to unmount.
316	* If that fails, clear the signal (it has been "processed"),
317	* otherwise we will loop here, as tsleep will always return
318	* EINTR/ERESTART.
319	*/
320	if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
321	if (dounmount(mp, 0, p) != 0)
322	CLRSIG(p, CURSIG(p));
323	}
324	return (error);
325	}
326
327	/*
328	* Get file system statistics.
329	*/
330	mfs_statfs(mp, sbp, p)
331	struct mount *mp;
332	struct statfs *sbp;
333	struct proc *p;
334	{
335	int error;
336
337	error = ffs_statfs(mp, sbp, p);
338	#ifdef COMPAT_09
339	sbp->f_type = 3;
340	#else
341	sbp->f_type = 0;
342	#endif
343	strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN);
344	sbp->f_fstypename[MFSNAMELEN] = '\0';
345	return (error);
346	}