[apple/xnu.git] / bsd / miscfs / devfs / devfs_vfsops.c

/*
 * Copyright (c) 2000-2002 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 1997,1998 Julian Elischer.  All rights reserved.
 * julian@freebsd.org
 * 
 * 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.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``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 HOLDER 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.
 * 
 * devfs_vfsops.c
 *
 */
/*
 * HISTORY
 *  Dieter Siegmund (dieter@apple.com) Wed Jul 14 13:37:59 PDT 1999
 *  - modified devfs_statfs() to use devfs_stats to calculate the
 *    amount of memory used by devfs
 */


#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/malloc.h>

#include "devfs.h"
#include "devfsdefs.h"

static int devfs_statfs( struct mount *mp, struct statfs *sbp, struct proc *p);

static struct vfsconf * devfs_vfsp = 0;
static int 		kernel_mount = 0;


/*-
 * Called from the generic VFS startups.
 * This is the second stage of DEVFS initialisation.
 * The probed devices have already been loaded and the 
 * basic structure of the DEVFS created.
 * We take the oportunity to mount the hidden DEVFS layer, so that
 * devices from devfs get sync'd.
 */
static int
devfs_init(struct vfsconf *vfsp)
{
    devfs_vfsp = vfsp; /* remember this for devfs_kernel_mount below */

    if (devfs_sinit())
	return (EOPNOTSUPP);
    devfs_make_node(makedev(0, 0), DEVFS_CHAR, 
		    UID_ROOT, GID_WHEEL, 0622, "console");
    devfs_make_node(makedev(2, 0), DEVFS_CHAR, 
		    UID_ROOT, GID_WHEEL, 0666, "tty");
    devfs_make_node(makedev(3, 0), DEVFS_CHAR, 
		    UID_ROOT, GID_KMEM, 0640, "mem");
    devfs_make_node(makedev(3, 1), DEVFS_CHAR, 
		    UID_ROOT, GID_KMEM, 0640, "kmem");
    devfs_make_node(makedev(3, 2), DEVFS_CHAR, 
		    UID_ROOT, GID_WHEEL, 0666, "null");
    devfs_make_node(makedev(3, 3), DEVFS_CHAR, 
		    UID_ROOT, GID_WHEEL, 0666, "zero");
    devfs_make_node(makedev(6, 0), DEVFS_CHAR, 
		    UID_ROOT, GID_WHEEL, 0600, "klog");
    return 0;
}

/*-
 *  mp	 - pointer to 'mount' structure
 *  path - addr in user space of mount point (ie /usr or whatever)
 *  data - addr in user space of mount params including the
 *         name of the block special file to treat as a filesystem.
 *         (NOT USED)
 *  ndp  - namei data pointer (NOT USED)
 *  p    - proc pointer
 * devfs is special in that it doesn't require any device to be mounted..
 * It makes up its data as it goes along.
 * it must be mounted during single user.. until it is, only std{in/out/err}
 * and the root filesystem are available.
 */
/*proto*/
int
devfs_mount(struct mount *mp, char *path, caddr_t data,
	    struct nameidata *ndp, struct proc *p)
{
	struct devfsmount *devfs_mp_p;	/* devfs specific mount info */
	int error;
	size_t size;

	/*-
	 *  If they just want to update, we don't need to do anything.
	 */
	if (mp->mnt_flag & MNT_UPDATE)
	{
		return 0;
	}

	/*-
	 *  Well, it's not an update, it's a real mount request.
	 *  Time to get dirty.
	 * HERE we should check to see if we are already mounted here.
	 */

	MALLOC(devfs_mp_p, struct devfsmount *, sizeof(struct devfsmount),
	       M_DEVFSMNT, M_WAITOK);
	if (devfs_mp_p == NULL)
		return (ENOMEM);
	bzero(devfs_mp_p,sizeof(*devfs_mp_p));
	devfs_mp_p->mount = mp;

	/*-
	 *  Fill out some fields
	 */
	mp->mnt_data = (qaddr_t)devfs_mp_p;
	mp->mnt_stat.f_type = mp->mnt_vfc->vfc_typenum;
	mp->mnt_stat.f_fsid.val[0] = (int32_t)(void *)devfs_mp_p;
	mp->mnt_stat.f_fsid.val[1] = mp->mnt_stat.f_type;
	mp->mnt_flag |= MNT_LOCAL;

	DEVFS_LOCK(p);
	error = dev_dup_plane(devfs_mp_p);
	DEVFS_UNLOCK(p);
	if (error) {
		mp->mnt_data = (qaddr_t)0;
		FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
		return (error);
	}

	/*-
	 *  Copy in the name of the directory the filesystem
	 *  is to be mounted on.
	 *  And we clear the remainder of the character strings
	 *  to be tidy.
	 */
	
	if (!kernel_mount) {
		copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname,
			sizeof(mp->mnt_stat.f_mntonname)-1, &size);
		bzero(mp->mnt_stat.f_mntonname + size,
			sizeof(mp->mnt_stat.f_mntonname) - size);
	}
	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
	bcopy("devfs",mp->mnt_stat.f_mntfromname, 5);
	DEVFS_INCR_MOUNTS();
	(void)devfs_statfs(mp, &mp->mnt_stat, p);
	return 0;
}


static int
devfs_start(struct mount *mp, int flags, struct proc *p)
{
	return 0;
}

/*-
 *  Unmount the filesystem described by mp.
 */
static int
devfs_unmount( struct mount *mp, int mntflags, struct proc *p)
{
	struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
	int flags = 0;
	int force = 0;
	int error;
	
	if (mntflags & MNT_FORCE) {
		flags |= FORCECLOSE;
		force = 1;
	}
	error = vflush(mp, NULLVP, flags);
	if (error && !force)
		return error;

	DEVFS_LOCK(p);
	devfs_free_plane(devfs_mp_p);
	DEVFS_UNLOCK(p);
	FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
	DEVFS_DECR_MOUNTS();
	mp->mnt_data = (qaddr_t)0;
	mp->mnt_flag &= ~MNT_LOCAL;

	return 0;
}

/* return the address of the root vnode  in *vpp */
static int
devfs_root(struct mount *mp, struct vnode **vpp)
{
	struct devfsmount *devfs_mp_p = (struct devfsmount *)(mp->mnt_data);
	int error;

	error = devfs_dntovn(devfs_mp_p->plane_root->de_dnp,vpp, 
			     current_proc());
	return error;
}

static int
devfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
	       struct proc *p)
{
	return EOPNOTSUPP;
}

static int
devfs_statfs( struct mount *mp, struct statfs *sbp, struct proc *p)
{
	struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;

	/*-
	 *  Fill in the stat block.
	 */
	sbp->f_type   = mp->mnt_stat.f_type;
	sbp->f_flags  = 0;		/* XXX */
	sbp->f_bsize  = 512;
	sbp->f_iosize = 512;
	sbp->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
			 + devfs_stats.nodes * sizeof(devnode_t)
			 + devfs_stats.entries * sizeof(devdirent_t)
			 + devfs_stats.stringspace
			 ) / sbp->f_bsize;
	sbp->f_bfree  = 0;
	sbp->f_bavail = 0;
	sbp->f_files  = devfs_stats.nodes;
	sbp->f_ffree  = 0;
	sbp->f_fsid.val[0] = (int32_t)(void *)devfs_mp_p;
	sbp->f_fsid.val[1] = mp->mnt_stat.f_type;

	/*-
	 *  Copy the mounted on and mounted from names into
	 *  the passed in stat block, if it is not the one
	 *  in the mount structure.
	 */
	if (sbp != &mp->mnt_stat) {
		bcopy((caddr_t)mp->mnt_stat.f_mntonname,
			(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
		bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
			(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
	}
	return 0;
}

static int
devfs_sync(struct mount *mp, int waitfor,struct ucred *cred,struct proc *p)
{
    return (0);
}


static int
devfs_vget(struct mount *mp, void * ino,struct vnode **vpp)
{
	return EOPNOTSUPP;
}

/*************************************************************
 * The concept of exporting a kernel generated devfs is stupid
 * So don't handle filehandles
 */

static int
devfs_fhtovp (struct mount *mp, struct fid *fhp, struct mbuf *nam,
	      struct vnode **vpp, int *exflagsp, struct ucred **credanonp)
{
	return (EINVAL);
}


static int
devfs_vptofh (struct vnode *vp, struct fid *fhp)
{
	return (EINVAL);
}

static int
devfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
	int *name;
	u_int namelen;
	void *oldp;
	size_t *oldlenp;
	void *newp;
	size_t newlen;
	struct proc *p;
{
    return (EOPNOTSUPP);
}

#include <sys/namei.h>

/*
 * Function: devfs_kernel_mount
 * Purpose:
 *   Mount devfs at the given mount point from within the kernel.
 */
int
devfs_kernel_mount(char * mntname)
{
	struct mount *mp;
	int error;
	struct proc *procp;
	struct nameidata nd;
	struct vnode  * vp;

	if (devfs_vfsp == NULL) {
	    printf("devfs_kernel_mount: devfs_vfsp is NULL\n");
	    return (EINVAL);
	}
	procp = current_proc();

	/*
	 * Get vnode to be covered
	 */
	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
	    mntname, procp);
	if ((error = namei(&nd))) {
	    printf("devfs_kernel_mount: failed to find directory '%s', %d", 
		   mntname, error);
	    return (error);
	}
	vp = nd.ni_vp;
	if ((error = vinvalbuf(vp, V_SAVE, procp->p_ucred, procp, 0, 0))) {
	    printf("devfs_kernel_mount: vinval failed: %d\n", error);
	    vput(vp);
	    return (error);
	}
	if (vp->v_type != VDIR) {
	    printf("devfs_kernel_mount: '%s' is not a directory\n", mntname);
	    vput(vp);
	    return (ENOTDIR);
	}
	if (vp->v_mountedhere != NULL) {
	    vput(vp);
	    return (EBUSY);
	}

	/*
	 * Allocate and initialize the filesystem.
	 */
	MALLOC_ZONE(mp, struct mount *, (u_long)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;

	lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
	(void)vfs_busy(mp, LK_NOWAIT, 0, procp);
	LIST_INIT(&mp->mnt_vnodelist);
	mp->mnt_op = devfs_vfsp->vfc_vfsops;
	mp->mnt_vfc = devfs_vfsp;
	devfs_vfsp->vfc_refcount++;
	mp->mnt_flag = 0;
	mp->mnt_flag |= devfs_vfsp->vfc_flags & MNT_VISFLAGMASK;
	strncpy(mp->mnt_stat.f_fstypename, devfs_vfsp->vfc_name, MFSNAMELEN);
	vp->v_mountedhere = mp;
	mp->mnt_vnodecovered = vp;
	mp->mnt_stat.f_owner = procp->p_ucred->cr_uid;
	(void) copystr(mntname, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0);

	kernel_mount = 1;
	error = devfs_mount(mp, mntname, NULL, NULL, procp);
	kernel_mount = 0;
	if (error) {
	    printf("devfs_kernel_mount: mount %s failed: %d", mntname, error);
	    mp->mnt_vfc->vfc_refcount--;

	    if (mp->mnt_kern_flag & MNTK_IO_XINFO)
	            FREE(mp->mnt_xinfo_ptr, M_TEMP);
	    vfs_unbusy(mp, procp);

	    FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
	    vput(vp);
	    return (error);
	}
	simple_lock(&mountlist_slock);
	CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
	simple_unlock(&mountlist_slock);
	VOP_UNLOCK(vp, 0, procp);
	vfs_unbusy(mp, procp);
	return (0);
}

struct vfsops devfs_vfsops = {
	devfs_mount,
	devfs_start,
	devfs_unmount,
	devfs_root,
	devfs_quotactl,
	devfs_statfs,
	devfs_sync,
	devfs_vget,
	devfs_fhtovp,
	devfs_vptofh,
	devfs_init,
	devfs_sysctl,
};
Commit	Line	Data
1c79356b	1	/*
55e303ae	2	* Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
1c79356b A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 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,
43866e37 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	/*-
	26	* Copyright 1997,1998 Julian Elischer. All rights reserved.
	27	* julian@freebsd.org
	28	*
	29	* Redistribution and use in source and binary forms, with or without
	30	* modification, are permitted provided that the following conditions are
	31	* met:
	32	* 1. Redistributions of source code must retain the above copyright
	33	* notice, this list of conditions and the following disclaimer.
	34	* 2. Redistributions in binary form must reproduce the above copyright notice,
	35	* this list of conditions and the following disclaimer in the documentation
	36	* and/or other materials provided with the distribution.
	37	*
	38	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY EXPRESS
	39	* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	40	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	41	* DISCLAIMED. IN NO EVENT SHALL THE HOLDER OR CONTRIBUTORS BE LIABLE FOR
	42	* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	43	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	44	* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	45	* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	46	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	47	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	48	* SUCH DAMAGE.
	49	*
	50	* devfs_vfsops.c
	51	*
	52	*/
	53	/*
	54	* HISTORY
	55	* Dieter Siegmund (dieter@apple.com) Wed Jul 14 13:37:59 PDT 1999
	56	* - modified devfs_statfs() to use devfs_stats to calculate the
	57	* amount of memory used by devfs
	58	*/
	59
	60
	61	#include <sys/param.h>
	62	#include <sys/systm.h>
	63	#include <sys/kernel.h>
	64	#include <sys/vnode.h>
	65	#include <sys/proc.h>
	66	#include <sys/mount.h>
	67	#include <sys/malloc.h>
	68
	69	#include "devfs.h"
	70	#include "devfsdefs.h"
	71
	72	static int devfs_statfs( struct mount mp, struct statfs sbp, struct proc *p);
	73
	74	static struct vfsconf * devfs_vfsp = 0;
	75	static int kernel_mount = 0;
	76
	77
	78	/*-
	79	* Called from the generic VFS startups.
	80	* This is the second stage of DEVFS initialisation.
	81	* The probed devices have already been loaded and the
	82	* basic structure of the DEVFS created.
	83	* We take the oportunity to mount the hidden DEVFS layer, so that
	84	* devices from devfs get sync'd.
	85	*/
86	static int
87	devfs_init(struct vfsconf *vfsp)
88	{
89	devfs_vfsp = vfsp; /* remember this for devfs_kernel_mount below */
90
91	if (devfs_sinit())
92	return (EOPNOTSUPP);
1c79356b A	93	devfs_make_node(makedev(0, 0), DEVFS_CHAR,
	94	UID_ROOT, GID_WHEEL, 0622, "console");
	95	devfs_make_node(makedev(2, 0), DEVFS_CHAR,
	96	UID_ROOT, GID_WHEEL, 0666, "tty");
	97	devfs_make_node(makedev(3, 0), DEVFS_CHAR,
	98	UID_ROOT, GID_KMEM, 0640, "mem");
	99	devfs_make_node(makedev(3, 1), DEVFS_CHAR,
	100	UID_ROOT, GID_KMEM, 0640, "kmem");
	101	devfs_make_node(makedev(3, 2), DEVFS_CHAR,
	102	UID_ROOT, GID_WHEEL, 0666, "null");
	103	devfs_make_node(makedev(3, 3), DEVFS_CHAR,
	104	UID_ROOT, GID_WHEEL, 0666, "zero");
	105	devfs_make_node(makedev(6, 0), DEVFS_CHAR,
	106	UID_ROOT, GID_WHEEL, 0600, "klog");
	107	return 0;
	108	}
	109
	110	/*-
	111	* mp - pointer to 'mount' structure
	112	* path - addr in user space of mount point (ie /usr or whatever)
	113	* data - addr in user space of mount params including the
	114	* name of the block special file to treat as a filesystem.
	115	* (NOT USED)
	116	* ndp - namei data pointer (NOT USED)
	117	* p - proc pointer
	118	* devfs is special in that it doesn't require any device to be mounted..
	119	* It makes up its data as it goes along.
	120	* it must be mounted during single user.. until it is, only std{in/out/err}
	121	* and the root filesystem are available.
	122	*/
	123	/proto/
	124	int
	125	devfs_mount(struct mount mp, char path, caddr_t data,
	126	struct nameidata ndp, struct proc p)
	127	{
	128	struct devfsmount devfs_mp_p; / devfs specific mount info */
	129	int error;
	130	size_t size;
	131
	132	/*-
	133	* If they just want to update, we don't need to do anything.
	134	*/
	135	if (mp->mnt_flag & MNT_UPDATE)
	136	{
	137	return 0;
	138	}
	139
	140	/*-
	141	* Well, it's not an update, it's a real mount request.
	142	* Time to get dirty.
	143	* HERE we should check to see if we are already mounted here.
	144	*/
	145
	146	MALLOC(devfs_mp_p, struct devfsmount *, sizeof(struct devfsmount),
	147	M_DEVFSMNT, M_WAITOK);
	148	if (devfs_mp_p == NULL)
	149	return (ENOMEM);
	150	bzero(devfs_mp_p,sizeof(*devfs_mp_p));
	151	devfs_mp_p->mount = mp;
	152
	153	/*-
	154	* Fill out some fields
	155	*/
	156	mp->mnt_data = (qaddr_t)devfs_mp_p;
157	mp->mnt_stat.f_type = mp->mnt_vfc->vfc_typenum;
158	mp->mnt_stat.f_fsid.val[0] = (int32_t)(void *)devfs_mp_p;
159	mp->mnt_stat.f_fsid.val[1] = mp->mnt_stat.f_type;
160	mp->mnt_flag \|= MNT_LOCAL;
161
162	DEVFS_LOCK(p);
163	error = dev_dup_plane(devfs_mp_p);
164	DEVFS_UNLOCK(p);
165	if (error) {
166	mp->mnt_data = (qaddr_t)0;
167	FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
168	return (error);
169	}
170
171	/*-
172	* Copy in the name of the directory the filesystem
173	* is to be mounted on.
174	* And we clear the remainder of the character strings
175	* to be tidy.
176	*/
177
178	if (!kernel_mount) {
179	copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname,
180	sizeof(mp->mnt_stat.f_mntonname)-1, &size);
181	bzero(mp->mnt_stat.f_mntonname + size,
182	sizeof(mp->mnt_stat.f_mntonname) - size);
183	}
184	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
185	bcopy("devfs",mp->mnt_stat.f_mntfromname, 5);
186	DEVFS_INCR_MOUNTS();
187	(void)devfs_statfs(mp, &mp->mnt_stat, p);
188	return 0;
189	}
190
191
192	static int
193	devfs_start(struct mount mp, int flags, struct proc p)
194	{
195	return 0;
196	}
197
198	/*-
199	* Unmount the filesystem described by mp.
200	*/
201	static int
202	devfs_unmount( struct mount mp, int mntflags, struct proc p)
203	{
204	struct devfsmount devfs_mp_p = (struct devfsmount )mp->mnt_data;
205	int flags = 0;
9bccf70c	206	int force = 0;
1c79356b A	207	int error;
	208
	209	if (mntflags & MNT_FORCE) {
	210	flags \|= FORCECLOSE;
9bccf70c	211	force = 1;
1c79356b A	212	}
1c79356b A	213	error = vflush(mp, NULLVP, flags);
9bccf70c	214	if (error && !force)
1c79356b A	215	return error;
	216
	217	DEVFS_LOCK(p);
	218	devfs_free_plane(devfs_mp_p);
	219	DEVFS_UNLOCK(p);
	220	FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
	221	DEVFS_DECR_MOUNTS();
	222	mp->mnt_data = (qaddr_t)0;
	223	mp->mnt_flag &= ~MNT_LOCAL;
	224
	225	return 0;
	226	}
	227
	228	/* return the address of the root vnode in vpp /
	229	static int
	230	devfs_root(struct mount mp, struct vnode *vpp)
	231	{
	232	struct devfsmount devfs_mp_p = (struct devfsmount )(mp->mnt_data);
	233	int error;
	234
	235	error = devfs_dntovn(devfs_mp_p->plane_root->de_dnp,vpp,
	236	current_proc());
	237	return error;
	238	}
	239
	240	static int
	241	devfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
	242	struct proc *p)
	243	{
	244	return EOPNOTSUPP;
	245	}
	246
	247	static int
	248	devfs_statfs( struct mount mp, struct statfs sbp, struct proc *p)
	249	{
	250	struct devfsmount devfs_mp_p = (struct devfsmount )mp->mnt_data;
	251
	252	/*-
	253	* Fill in the stat block.
	254	*/
	255	sbp->f_type = mp->mnt_stat.f_type;
	256	sbp->f_flags = 0; /* XXX */
	257	sbp->f_bsize = 512;
	258	sbp->f_iosize = 512;
	259	sbp->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
	260	+ devfs_stats.nodes * sizeof(devnode_t)
	261	+ devfs_stats.entries * sizeof(devdirent_t)
	262	+ devfs_stats.stringspace
	263	) / sbp->f_bsize;
	264	sbp->f_bfree = 0;
	265	sbp->f_bavail = 0;
	266	sbp->f_files = devfs_stats.nodes;
	267	sbp->f_ffree = 0;
	268	sbp->f_fsid.val[0] = (int32_t)(void *)devfs_mp_p;
	269	sbp->f_fsid.val[1] = mp->mnt_stat.f_type;
	270
	271	/*-
	272	* Copy the mounted on and mounted from names into
	273	* the passed in stat block, if it is not the one
	274	* in the mount structure.
	275	*/
	276	if (sbp != &mp->mnt_stat) {
	277	bcopy((caddr_t)mp->mnt_stat.f_mntonname,
	278	(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
279	bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
280	(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
281	}
282	return 0;
283	}
284
285	static int
286	devfs_sync(struct mount mp, int waitfor,struct ucred cred,struct proc *p)
287	{
288	return (0);
289	}
290
291
292	static int
293	devfs_vget(struct mount mp, void ino,struct vnode **vpp)
294	{
295	return EOPNOTSUPP;
296	}
297
298	/*************************************************************
299	* The concept of exporting a kernel generated devfs is stupid
300	* So don't handle filehandles
301	*/
302
303	static int
304	devfs_fhtovp (struct mount mp, struct fid fhp, struct mbuf *nam,
305	struct vnode *vpp, int exflagsp, struct ucred **credanonp)
306	{
307	return (EINVAL);
308	}
309
310
311	static int
312	devfs_vptofh (struct vnode vp, struct fid fhp)
313	{
314	return (EINVAL);
315	}
316
317	static int
318	devfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
319	int *name;
320	u_int namelen;
321	void *oldp;
322	size_t *oldlenp;
323	void *newp;
324	size_t newlen;
325	struct proc *p;
326	{
327	return (EOPNOTSUPP);
328	}
329
330	#include <sys/namei.h>
331
332	/*
333	* Function: devfs_kernel_mount
334	* Purpose:
335	* Mount devfs at the given mount point from within the kernel.
336	*/
337	int
338	devfs_kernel_mount(char * mntname)
339	{
340	struct mount *mp;
341	int error;
342	struct proc *procp;
343	struct nameidata nd;
344	struct vnode * vp;
345
346	if (devfs_vfsp == NULL) {
347	printf("devfs_kernel_mount: devfs_vfsp is NULL\n");
348	return (EINVAL);
349	}
350	procp = current_proc();
351
352	/*
353	* Get vnode to be covered
354	*/
355	NDINIT(&nd, LOOKUP, FOLLOW \| LOCKLEAF, UIO_SYSSPACE,
356	mntname, procp);
357	if ((error = namei(&nd))) {
358	printf("devfs_kernel_mount: failed to find directory '%s', %d",
359	mntname, error);
360	return (error);
361	}
362	vp = nd.ni_vp;
363	if ((error = vinvalbuf(vp, V_SAVE, procp->p_ucred, procp, 0, 0))) {
364	printf("devfs_kernel_mount: vinval failed: %d\n", error);
365	vput(vp);
366	return (error);
367	}
368	if (vp->v_type != VDIR) {
369	printf("devfs_kernel_mount: '%s' is not a directory\n", mntname);
370	vput(vp);
371	return (ENOTDIR);
372	}
373	if (vp->v_mountedhere != NULL) {
374	vput(vp);
375	return (EBUSY);
376	}
377
378	/*
379	* Allocate and initialize the filesystem.
380	*/
55e303ae A	381	MALLOC_ZONE(mp, struct mount *, (u_long)sizeof(struct mount),
55e303ae A	382	M_MOUNT, M_WAITOK);
1c79356b	383	bzero((char *)mp, (u_long)sizeof(struct mount));
0b4e3aa0 A	384
	385	/* Initialize the default IO constraints */
	386	mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
	387	mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
	388
1c79356b A	389	lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
	390	(void)vfs_busy(mp, LK_NOWAIT, 0, procp);
	391	LIST_INIT(&mp->mnt_vnodelist);
	392	mp->mnt_op = devfs_vfsp->vfc_vfsops;
	393	mp->mnt_vfc = devfs_vfsp;
	394	devfs_vfsp->vfc_refcount++;
	395	mp->mnt_flag = 0;
	396	mp->mnt_flag \|= devfs_vfsp->vfc_flags & MNT_VISFLAGMASK;
	397	strncpy(mp->mnt_stat.f_fstypename, devfs_vfsp->vfc_name, MFSNAMELEN);
	398	vp->v_mountedhere = mp;
	399	mp->mnt_vnodecovered = vp;
	400	mp->mnt_stat.f_owner = procp->p_ucred->cr_uid;
	401	(void) copystr(mntname, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0);
	402
	403	kernel_mount = 1;
	404	error = devfs_mount(mp, mntname, NULL, NULL, procp);
	405	kernel_mount = 0;
	406	if (error) {
	407	printf("devfs_kernel_mount: mount %s failed: %d", mntname, error);
	408	mp->mnt_vfc->vfc_refcount--;
55e303ae A	409
	410	if (mp->mnt_kern_flag & MNTK_IO_XINFO)
	411	FREE(mp->mnt_xinfo_ptr, M_TEMP);
1c79356b	412	vfs_unbusy(mp, procp);
55e303ae A	413
55e303ae A	414	FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
1c79356b A	415	vput(vp);
	416	return (error);
	417	}
1c79356b A	418	simple_lock(&mountlist_slock);
	419	CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
	420	simple_unlock(&mountlist_slock);
	421	VOP_UNLOCK(vp, 0, procp);
	422	vfs_unbusy(mp, procp);
	423	return (0);
	424	}
	425
	426	struct vfsops devfs_vfsops = {
	427	devfs_mount,
	428	devfs_start,
	429	devfs_unmount,
	430	devfs_root,
	431	devfs_quotactl,
	432	devfs_statfs,
	433	devfs_sync,
	434	devfs_vget,
	435	devfs_fhtovp,
	436	devfs_vptofh,
	437	devfs_init,
	438	devfs_sysctl,
	439	};