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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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. 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_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	*
d7e50217	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
d7e50217 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
d7e50217 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	26	/*
	27	* Copyright (c) 1989, 1990, 1993, 1994
	28	* The Regents of the University of California. All rights reserved.
	29	*
	30	* Redistribution and use in source and binary forms, with or without
	31	* modification, are permitted provided that the following conditions
	32	* are met:
	33	* 1. Redistributions of source code must retain the above copyright
	34	* notice, this list of conditions and the following disclaimer.
	35	* 2. Redistributions in binary form must reproduce the above copyright
	36	* notice, this list of conditions and the following disclaimer in the
	37	* documentation and/or other materials provided with the distribution.
	38	* 3. All advertising materials mentioning features or use of this software
	39	* must display the following acknowledgement:
	40	* This product includes software developed by the University of
	41	* California, Berkeley and its contributors.
	42	* 4. Neither the name of the University nor the names of its contributors
	43	* may be used to endorse or promote products derived from this software
	44	* without specific prior written permission.
	45	*
	46	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	47	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	48	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	49	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	50	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	51	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	52	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	53	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	54	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	55	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	56	* SUCH DAMAGE.
	57	*
	58	* @(#)mfs_vfsops.c 8.4 (Berkeley) 4/16/94
	59	*/
	60
	61	#include <sys/param.h>
	62	#include <sys/systm.h>
	63	#include <sys/time.h>
	64	#include <sys/kernel.h>
	65	#include <sys/proc.h>
	66	#include <sys/buf.h>
	67	#include <sys/mount.h>
	68	#include <sys/signalvar.h>
	69	#include <sys/vnode.h>
	70	#include <sys/malloc.h>
	71
	72	#include <ufs/ufs/quota.h>
	73	#include <ufs/ufs/inode.h>
	74	#include <ufs/ufs/ufsmount.h>
	75	#include <ufs/ufs/ufs_extern.h>
	76
	77	#include <ufs/ffs/fs.h>
	78	#include <ufs/ffs/ffs_extern.h>
	79
	80	#include <ufs/mfs/mfsnode.h>
	81	#include <ufs/mfs/mfs_extern.h>
	82
	83	caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */
	84	u_long mfs_rootsize; /* size of mini-root in bytes */
	85
86	static int mfs_minor; /* used for building internal dev_t */
87
88	extern int (*mfs_vnodeop_p)(void );
89
90	/*
91	* mfs vfs operations.
92	*/
93	struct vfsops mfs_vfsops = {
94	MOUNT_MFS,
95	mfs_mount,
96	mfs_start,
97	ffs_unmount,
98	ufs_root,
99	ufs_quotactl,
100	mfs_statfs,
101	ffs_sync,
102	ffs_vget,
103	ffs_fhtovp,
104	ffs_vptofh,
105	mfs_init,
106	};
107
108	/*
109	* Called by main() when mfs is going to be mounted as root.
110	*
111	* Name is updated by mount(8) after booting.
112	*/
113	#define ROOTNAME "mfs_root"
114
115	mfs_mountroot()
116	{
117	extern struct vnode *rootvp;
118	register struct fs *fs;
119	register struct mount *mp;
120	struct proc p = kernel_proc; / XXX - WMG*/
121	struct ufsmount *ump;
122	struct mfsnode *mfsp;
123	size_t size;
124	int error;
125
126	/*
127	* Get vnodes for swapdev and rootdev.
128	*/
129	#if 0
130	if (bdevvp(swapdev, &swapdev_vp) \|\| bdevvp(rootdev, &rootvp))
131	panic("mfs_mountroot: can't setup bdevvp's");
132	#else
133	if ( bdevvp(rootdev, &rootvp))
134	panic("mfs_mountroot: can't setup bdevvp's");
135
136	#endif
137	MALLOC_ZONE(mp, struct mount *,
138	sizeof(struct mount), M_MOUNT, M_WAITOK);
139	bzero((char *)mp, (u_long)sizeof(struct mount));
0b4e3aa0 A	140
	141	/* Initialize the default IO constraints */
	142	mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
	143	mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
	144
1c79356b A	145	mp->mnt_op = &mfs_vfsops;
	146	mp->mnt_flag = MNT_RDONLY;
	147	MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
	148	rootvp->v_data = mfsp;
	149	rootvp->v_op = mfs_vnodeop_p;
	150	rootvp->v_tag = VT_MFS;
	151	mfsp->mfs_baseoff = mfs_rootbase;
	152	mfsp->mfs_size = mfs_rootsize;
	153	mfsp->mfs_vnode = rootvp;
	154	mfsp->mfs_pid = p->p_pid;
	155	mfsp->mfs_buflist = (struct buf *)0;
	156	if (error = ffs_mountfs(rootvp, mp, p)) {
9bccf70c	157	vrele(rootvp); /* release the reference from bdevvp() */
1c79356b A	158	_FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
	159	_FREE(mfsp, M_MFSNODE);
	160	return (error);
	161	}
	162	if (error = vfs_lock(mp)) {
	163	(void)ffs_unmount(mp, 0, p);
	164	_FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
	165	_FREE(mfsp, M_MFSNODE);
	166	return (error);
	167	}
	168	CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
	169	mp->mnt_vnodecovered = NULLVP;
	170	ump = VFSTOUFS(mp);
	171	fs = ump->um_fs;
	172	bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
	173	fs->fs_fsmnt[0] = '/';
	174	bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
	175	(void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
	176	&size);
	177	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
	178	(void)ffs_statfs(mp, &mp->mnt_stat, p);
	179	vfs_unlock(mp);
	180	inittodr((time_t)0);
	181	return (0);
	182	}
	183
	184	/*
	185	* This is called early in boot to set the base address and size
	186	* of the mini-root.
	187	*/
	188	mfs_initminiroot(base)
	189	caddr_t base;
	190	{
	191	struct fs fs = (struct fs )(base + SBOFF);
	192	extern int (*mountroot)();
	193
	194	/* check for valid super block */
	195	if (fs->fs_magic != FS_MAGIC \|\| fs->fs_bsize > MAXBSIZE \|\|
	196	fs->fs_bsize < sizeof(struct fs))
	197	return (0);
	198	mountroot = mfs_mountroot;
	199	mfs_rootbase = base;
	200	mfs_rootsize = fs->fs_fsize * fs->fs_size;
	201	rootdev = makedev(255, mfs_minor++);
	202	return (mfs_rootsize);
	203	}
	204
	205	/*
	206	* VFS Operations.
	207	*
	208	* mount system call
	209	*/
	210	/* ARGSUSED */
	211	int
	212	mfs_mount(mp, path, data, ndp, p)
	213	register struct mount *mp;
	214	char *path;
	215	caddr_t data;
	216	struct nameidata *ndp;
	217	struct proc *p;
	218	{
	219	struct vnode *devvp;
	220	struct mfs_args args;
	221	struct ufsmount *ump;
222	register struct fs *fs;
223	register struct mfsnode *mfsp;
224	size_t size;
225	int flags, error;
226
227	if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
228	return (error);
229
230	/*
231	* If updating, check whether changing from read-only to
232	* read/write; if there is no device name, that's all we do.
233	*/
234	if (mp->mnt_flag & MNT_UPDATE) {
235	ump = VFSTOUFS(mp);
236	fs = ump->um_fs;
237	if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
238	flags = WRITECLOSE;
239	if (mp->mnt_flag & MNT_FORCE)
240	flags \|= FORCECLOSE;
241	if (vfs_busy(mp))
242	return (EBUSY);
243	error = ffs_flushfiles(mp, flags, p);
244	vfs_unbusy(mp);
245	if (error)
246	return (error);
247	}
248	if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
249	fs->fs_ronly = 0;
250	#ifdef EXPORTMFS
251	if (args.fspec == 0)
252	return (vfs_export(mp, &ump->um_export, &args.export));
253	#endif
254	return (0);
255	}
256	MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
257	error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
258	if (error) {
259	FREE(mfsp, M_MFSNODE);
260	return (error);
261	}
262	devvp->v_type = VBLK;
263	if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
264	panic("mfs_mount: dup dev");
265	devvp->v_data = mfsp;
266	mfsp->mfs_baseoff = args.base;
267	mfsp->mfs_size = args.size;
268	mfsp->mfs_vnode = devvp;
269	mfsp->mfs_pid = p->p_pid;
270	mfsp->mfs_buflist = (struct buf *)0;
271	if (error = ffs_mountfs(devvp, mp, p)) {
272	mfsp->mfs_buflist = (struct buf *)-1;
273	vrele(devvp);
274	return (error);
275	}
276	ump = VFSTOUFS(mp);
277	fs = ump->um_fs;
278	(void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
279	bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
280	bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
281	(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
282	&size);
283	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
284	return (0);
285	}
286
287	int mfs_pri = PWAIT \| PCATCH; /* XXX prob. temp */
288
289	/*
290	* Used to grab the process and keep it in the kernel to service
291	* memory filesystem I/O requests.
292	*
293	* Loop servicing I/O requests.
294	* Copy the requested data into or out of the memory filesystem
295	* address space.
296	*/
297	/* ARGSUSED */
298	int
299	mfs_start(mp, flags, p)
300	struct mount *mp;
301	int flags;
302	struct proc *p;
303	{
304	register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
305	register struct mfsnode *mfsp = VTOMFS(vp);
306	register struct buf *bp;
307	register caddr_t base;
308	int error = 0;
309
310	base = mfsp->mfs_baseoff;
311	while (mfsp->mfs_buflist != (struct buf *)(-1)) {
312	while (bp = mfsp->mfs_buflist) {
313	mfsp->mfs_buflist = bp->b_actf;
314	mfs_doio(bp, base);
315	wakeup((caddr_t)bp);
316	}
317	/*
318	* If a non-ignored signal is received, try to unmount.
319	* If that fails, clear the signal (it has been "processed"),
320	* otherwise we will loop here, as tsleep will always return
321	* EINTR/ERESTART.
322	*/
323	if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
324	if (dounmount(mp, 0, p) != 0)
325	CLRSIG(p, CURSIG(p));
326	}
327	return (error);
328	}
329
330	/*
331	* Get file system statistics.
332	*/
333	mfs_statfs(mp, sbp, p)
334	struct mount *mp;
335	struct statfs *sbp;
336	struct proc *p;
337	{
338	int error;
339
340	error = ffs_statfs(mp, sbp, p);
341	#ifdef COMPAT_09
342	sbp->f_type = 3;
343	#else
344	sbp->f_type = 0;
345	#endif
346	strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN);
347	sbp->f_fstypename[MFSNAMELEN] = '\0';
348	return (error);
349	}