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

/*
 * Copyright (c) 2000-2007 Apple 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 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
 *
 */
/*
 * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
 * support for mandatory and extensible security protections.  This notice
 * is included in support of clause 2.2 (b) of the Apple Public License,
 * Version 2.0.
 */
/*
 * 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_internal.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <sys/mount_internal.h>
#include <sys/malloc.h>

#include <libkern/OSAtomic.h>

#if CONFIG_MACF
#include <security/mac_framework.h>
#endif

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

#if FDESC
#include "fdesc.h"
#endif /* FDESC */


static int devfs_statfs( struct mount *mp, struct vfsstatfs *sbp, vfs_context_t ctx);
static int devfs_vfs_getattr(mount_t mp, struct vfs_attr *fsap, vfs_context_t ctx);

extern int setup_kmem;
__private_extern__ void devfs_setup_kmem(void);


/*-
 * 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(__unused struct vfsconf *vfsp)
{
    if (devfs_sinit())
	return (ENOTSUP);
    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");
    if (setup_kmem) {
    	devfs_setup_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");

#if  FDESC
    devfs_fdesc_init();
#endif

    return 0;
}

__private_extern__ void
devfs_setup_kmem(void)
{
    	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");
}


/*-
 *  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, __unused vnode_t devvp, __unused user_addr_t data, vfs_context_t ctx)
{
	struct devfsmount *devfs_mp_p;	/* devfs specific mount info */
	int error;

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

	/* Advisory locking should be handled at the VFS layer */
	vfs_setlocklocal(mp);

	/*-
	 *  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_vfsstat.f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p;
	mp->mnt_vfsstat.f_fsid.val[1] = vfs_typenum(mp);
	mp->mnt_flag |= MNT_LOCAL;

	DEVFS_LOCK();
	error = dev_dup_plane(devfs_mp_p);
	DEVFS_UNLOCK();

	if (error) {
		mp->mnt_data = (qaddr_t)0;
		FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
		return (error);
	} else
	        DEVFS_INCR_MOUNTS();

	/*-
	 *  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.
	 */
	
	bzero(mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN);
	bcopy("devfs",mp->mnt_vfsstat.f_mntfromname, 5);
	(void)devfs_statfs(mp, &mp->mnt_vfsstat, ctx);

	return 0;
}


static int
devfs_start(__unused struct mount *mp, __unused int flags, __unused vfs_context_t ctx)
{
	return 0;
}

/*-
 *  Unmount the filesystem described by mp.
 */
static int
devfs_unmount( struct mount *mp, int mntflags, __unused vfs_context_t ctx)
{
	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();
	devfs_free_plane(devfs_mp_p);
	DEVFS_UNLOCK();

	DEVFS_DECR_MOUNTS();

	FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
	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, __unused vfs_context_t ctx)
{
	struct devfsmount *devfs_mp_p = (struct devfsmount *)(mp->mnt_data);
	int error;

	DEVFS_LOCK();
	/* last parameter to devfs_dntovn() is ignored */
	error = devfs_dntovn(devfs_mp_p->plane_root->de_dnp, vpp, NULL);
	DEVFS_UNLOCK();

	return error;
}

static int
devfs_statfs( struct mount *mp, struct vfsstatfs *sbp, __unused vfs_context_t ctx)
{
	struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;

	/*-
	 *  Fill in the stat block.
	 */
	//sbp->f_type   = mp->mnt_vfsstat.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)(uintptr_t)devfs_mp_p;
	sbp->f_fsid.val[1] = vfs_typenum(mp);

	return 0;
}

static int
devfs_vfs_getattr(__unused mount_t mp, struct vfs_attr *fsap, __unused vfs_context_t ctx)
{
	VFSATTR_RETURN(fsap, f_objcount, devfs_stats.nodes);
	VFSATTR_RETURN(fsap, f_maxobjcount, devfs_stats.nodes);
	VFSATTR_RETURN(fsap, f_bsize, 512);
	VFSATTR_RETURN(fsap, f_iosize, 512);
	if (VFSATTR_IS_ACTIVE(fsap, f_blocks) || VFSATTR_IS_ACTIVE(fsap, f_bused)) {
		fsap->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
			 + devfs_stats.nodes * sizeof(devnode_t)
			 + devfs_stats.entries * sizeof(devdirent_t)
			 + devfs_stats.stringspace
			 ) / fsap->f_bsize;
		fsap->f_bused = fsap->f_blocks;
		VFSATTR_SET_SUPPORTED(fsap, f_blocks);
		VFSATTR_SET_SUPPORTED(fsap, f_bused);
	}
	VFSATTR_RETURN(fsap, f_bfree, 0);
	VFSATTR_RETURN(fsap, f_bavail, 0);
	VFSATTR_RETURN(fsap, f_files, devfs_stats.nodes);
	VFSATTR_RETURN(fsap, f_ffree, 0);
	VFSATTR_RETURN(fsap, f_fssubtype, 0);
	
	if (VFSATTR_IS_ACTIVE(fsap, f_capabilities)) {
		fsap->f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] =
			VOL_CAP_FMT_SYMBOLICLINKS |
			VOL_CAP_FMT_HARDLINKS |
			VOL_CAP_FMT_NO_ROOT_TIMES |
			VOL_CAP_FMT_CASE_SENSITIVE |
			VOL_CAP_FMT_CASE_PRESERVING |
			VOL_CAP_FMT_FAST_STATFS |
			VOL_CAP_FMT_2TB_FILESIZE |
			VOL_CAP_FMT_HIDDEN_FILES;
		fsap->f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] =
			VOL_CAP_INT_ATTRLIST ;
		fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED1] = 0;
		fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED2] = 0;
		
		fsap->f_capabilities.valid[VOL_CAPABILITIES_FORMAT] =
			VOL_CAP_FMT_PERSISTENTOBJECTIDS |
			VOL_CAP_FMT_SYMBOLICLINKS |
			VOL_CAP_FMT_HARDLINKS |
			VOL_CAP_FMT_JOURNAL |
			VOL_CAP_FMT_JOURNAL_ACTIVE |
			VOL_CAP_FMT_NO_ROOT_TIMES |
			VOL_CAP_FMT_SPARSE_FILES |
			VOL_CAP_FMT_ZERO_RUNS |
			VOL_CAP_FMT_CASE_SENSITIVE |
			VOL_CAP_FMT_CASE_PRESERVING |
			VOL_CAP_FMT_FAST_STATFS |
			VOL_CAP_FMT_2TB_FILESIZE |
			VOL_CAP_FMT_OPENDENYMODES |
			VOL_CAP_FMT_HIDDEN_FILES |
			VOL_CAP_FMT_PATH_FROM_ID |
			VOL_CAP_FMT_NO_VOLUME_SIZES;
		fsap->f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] =
			VOL_CAP_INT_SEARCHFS |
			VOL_CAP_INT_ATTRLIST |
			VOL_CAP_INT_NFSEXPORT |
			VOL_CAP_INT_READDIRATTR |
			VOL_CAP_INT_EXCHANGEDATA |
			VOL_CAP_INT_COPYFILE |
			VOL_CAP_INT_ALLOCATE |
			VOL_CAP_INT_VOL_RENAME |
			VOL_CAP_INT_ADVLOCK |
			VOL_CAP_INT_FLOCK |
			VOL_CAP_INT_EXTENDED_SECURITY |
			VOL_CAP_INT_USERACCESS |
			VOL_CAP_INT_MANLOCK |
			VOL_CAP_INT_EXTENDED_ATTR |
			VOL_CAP_INT_NAMEDSTREAMS;
		fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED1] = 0;
		fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED2] = 0;
		
		VFSATTR_SET_SUPPORTED(fsap, f_capabilities);
	}
	
	if (VFSATTR_IS_ACTIVE(fsap, f_attributes)) {
		fsap->f_attributes.validattr.commonattr =
			ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_FSID |
			ATTR_CMN_OBJTYPE | ATTR_CMN_OBJTAG | ATTR_CMN_OBJID |
			ATTR_CMN_PAROBJID |
			ATTR_CMN_MODTIME | ATTR_CMN_CHGTIME | ATTR_CMN_ACCTIME |
			ATTR_CMN_OWNERID | ATTR_CMN_GRPID | ATTR_CMN_ACCESSMASK |
			ATTR_CMN_FLAGS | ATTR_CMN_USERACCESS | ATTR_CMN_FILEID;
		fsap->f_attributes.validattr.volattr =
			ATTR_VOL_FSTYPE | ATTR_VOL_SIZE | ATTR_VOL_SPACEFREE |
			ATTR_VOL_SPACEAVAIL | ATTR_VOL_MINALLOCATION |
			ATTR_VOL_OBJCOUNT | ATTR_VOL_MAXOBJCOUNT |
			ATTR_VOL_MOUNTPOINT | ATTR_VOL_MOUNTFLAGS |
			ATTR_VOL_MOUNTEDDEVICE | ATTR_VOL_CAPABILITIES |
			ATTR_VOL_ATTRIBUTES;
		fsap->f_attributes.validattr.dirattr =
			ATTR_DIR_LINKCOUNT | ATTR_DIR_MOUNTSTATUS;
		fsap->f_attributes.validattr.fileattr =
			ATTR_FILE_LINKCOUNT | ATTR_FILE_TOTALSIZE |
			ATTR_FILE_IOBLOCKSIZE | ATTR_FILE_DEVTYPE |
			ATTR_FILE_DATALENGTH;
		fsap->f_attributes.validattr.forkattr = 0;
		
		fsap->f_attributes.nativeattr.commonattr =
			ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_FSID |
			ATTR_CMN_OBJTYPE | ATTR_CMN_OBJTAG | ATTR_CMN_OBJID |
			ATTR_CMN_PAROBJID |
			ATTR_CMN_MODTIME | ATTR_CMN_CHGTIME | ATTR_CMN_ACCTIME |
			ATTR_CMN_OWNERID | ATTR_CMN_GRPID | ATTR_CMN_ACCESSMASK |
			ATTR_CMN_FLAGS | ATTR_CMN_USERACCESS | ATTR_CMN_FILEID;
		fsap->f_attributes.nativeattr.volattr =
			ATTR_VOL_FSTYPE | ATTR_VOL_SIZE | ATTR_VOL_SPACEFREE |
			ATTR_VOL_SPACEAVAIL | ATTR_VOL_MINALLOCATION |
			ATTR_VOL_OBJCOUNT | ATTR_VOL_MAXOBJCOUNT |
			ATTR_VOL_MOUNTPOINT | ATTR_VOL_MOUNTFLAGS |
			ATTR_VOL_MOUNTEDDEVICE | ATTR_VOL_CAPABILITIES |
			ATTR_VOL_ATTRIBUTES;
		fsap->f_attributes.nativeattr.dirattr =
			ATTR_DIR_MOUNTSTATUS;
		fsap->f_attributes.nativeattr.fileattr =
			ATTR_FILE_LINKCOUNT | ATTR_FILE_TOTALSIZE |
			ATTR_FILE_IOBLOCKSIZE | ATTR_FILE_DEVTYPE |
			ATTR_FILE_DATALENGTH;
		fsap->f_attributes.nativeattr.forkattr = 0;

		VFSATTR_SET_SUPPORTED(fsap, f_attributes);
	}
	
	return 0;
}

static int
devfs_sync(__unused struct mount *mp, __unused int waitfor, __unused vfs_context_t ctx)
{
    return (0);
}


static int
devfs_vget(__unused struct mount *mp, __unused ino64_t ino, __unused struct vnode **vpp, __unused vfs_context_t ctx)
{
	return ENOTSUP;
}

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

static int
devfs_fhtovp (__unused struct mount *mp, __unused int fhlen, __unused unsigned char *fhp, __unused struct vnode **vpp, __unused vfs_context_t ctx)
{
	return (EINVAL);
}


static int
devfs_vptofh (__unused struct vnode *vp, __unused int *fhlenp, __unused unsigned char *fhp, __unused vfs_context_t ctx)
{
	return (EINVAL);
}

static int
devfs_sysctl(__unused int *name, __unused u_int namelen, __unused user_addr_t oldp, 
             __unused size_t *oldlenp, __unused user_addr_t newp, 
             __unused size_t newlen, __unused vfs_context_t ctx)
{
    return (ENOTSUP);
}

#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 nameidata nd;
	struct vnode  * vp;
	vfs_context_t ctx = vfs_context_kernel();
	struct vfstable *vfsp;

	/* Find our vfstable entry */
	for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
		if (!strncmp(vfsp->vfc_name, "devfs", sizeof(vfsp->vfc_name)))
			break;
	
	if (!vfsp) {
		panic("Could not find entry in vfsconf for devfs.\n");
	} 

	/*
	 * Get vnode to be covered
	 */
	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
	    CAST_USER_ADDR_T(mntname), ctx);
	if ((error = namei(&nd))) {
	    printf("devfs_kernel_mount: failed to find directory '%s', %d", 
		   mntname, error);
	    return (error);
	}
	nameidone(&nd);
	vp = nd.ni_vp;

	if ((error = VNOP_FSYNC(vp, MNT_WAIT, ctx))) {
	    printf("devfs_kernel_mount: vnop_fsync failed: %d\n", error);
	    vnode_put(vp);
	    return (error);
	}
	if ((error = buf_invalidateblks(vp, BUF_WRITE_DATA, 0, 0))) {
	    printf("devfs_kernel_mount: buf_invalidateblks failed: %d\n", error);
	    vnode_put(vp);
	    return (error);
	}
	if (vnode_isdir(vp) == 0) {
	    printf("devfs_kernel_mount: '%s' is not a directory\n", mntname);
	    vnode_put(vp);
	    return (ENOTDIR);
	}
	if ((vnode_mountedhere(vp))) {
	    vnode_put(vp);
	    return (EBUSY);
	}

	/*
	 * Allocate and initialize the filesystem.
	 */
	MALLOC_ZONE(mp, struct mount *, sizeof(struct mount),
		M_MOUNT, M_WAITOK);
	bzero((char *)mp, sizeof(struct mount));

	/* Initialize the default IO constraints */
	mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
	mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
	mp->mnt_ioflags = 0;
	mp->mnt_realrootvp = NULLVP;
	mp->mnt_authcache_ttl = CACHED_LOOKUP_RIGHT_TTL;

	mount_lock_init(mp);
	TAILQ_INIT(&mp->mnt_vnodelist);
	TAILQ_INIT(&mp->mnt_workerqueue);
	TAILQ_INIT(&mp->mnt_newvnodes);

	(void)vfs_busy(mp, LK_NOWAIT);
	mp->mnt_op = &devfs_vfsops;
	mp->mnt_vtable = vfsp;
	mp->mnt_flag = 0;
	mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
	strlcpy(mp->mnt_vfsstat.f_fstypename, vfsp->vfc_name, MFSTYPENAMELEN);
	vp->v_mountedhere = mp;
	mp->mnt_vnodecovered = vp;
	mp->mnt_vfsstat.f_owner = kauth_cred_getuid(kauth_cred_get());
	(void) copystr(mntname, mp->mnt_vfsstat.f_mntonname, MAXPATHLEN - 1, 0);
#if CONFIG_MACF
	mac_mount_label_init(mp);
	mac_mount_label_associate(ctx, mp);
#endif

	error = devfs_mount(mp, NULL, USER_ADDR_NULL, ctx);

	if (error) {
	    printf("devfs_kernel_mount: mount %s failed: %d", mntname, error);
	    mp->mnt_vtable->vfc_refcount--;

	    vfs_unbusy(mp);

	    mount_lock_destroy(mp);
#if CONFIG_MACF
	    mac_mount_label_destroy(mp);
#endif
	    FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
	    vnode_put(vp);
	    return (error);
	}
	vnode_ref(vp);
	vnode_put(vp);
	vfs_unbusy(mp);
	mount_list_add(mp);
	return (0);
}

struct vfsops devfs_vfsops = {
	devfs_mount,
	devfs_start,
	devfs_unmount,
	devfs_root,
	NULL,				/* quotactl */
	devfs_vfs_getattr,
	devfs_sync,
	devfs_vget,
	devfs_fhtovp,
	devfs_vptofh,
	devfs_init,
	devfs_sysctl,
	NULL,
	{NULL}
};
Commit	Line	Data
1c79356b	1	/*
2d21ac55	2	* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
5d5c5d0d	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	/*-
	29	* Copyright 1997,1998 Julian Elischer. All rights reserved.
	30	* julian@freebsd.org
	31	*
	32	* Redistribution and use in source and binary forms, with or without
	33	* modification, are permitted provided that the following conditions are
	34	* met:
	35	* 1. Redistributions of source code must retain the above copyright
	36	* notice, this list of conditions and the following disclaimer.
	37	* 2. Redistributions in binary form must reproduce the above copyright notice,
	38	* this list of conditions and the following disclaimer in the documentation
	39	* and/or other materials provided with the distribution.
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY EXPRESS
	42	* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	43	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	44	* DISCLAIMED. IN NO EVENT SHALL THE HOLDER OR CONTRIBUTORS BE LIABLE FOR
	45	* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	47	* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	48	* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* devfs_vfsops.c
	54	*
	55	*/
2d21ac55 A	56	/*
	57	* NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
	58	* support for mandatory and extensible security protections. This notice
	59	* is included in support of clause 2.2 (b) of the Apple Public License,
	60	* Version 2.0.
	61	*/
1c79356b A	62	/*
	63	* HISTORY
	64	* Dieter Siegmund (dieter@apple.com) Wed Jul 14 13:37:59 PDT 1999
	65	* - modified devfs_statfs() to use devfs_stats to calculate the
	66	* amount of memory used by devfs
	67	*/
	68
	69
	70	#include <sys/param.h>
	71	#include <sys/systm.h>
	72	#include <sys/kernel.h>
91447636	73	#include <sys/vnode_internal.h>
1c79356b	74	#include <sys/proc.h>
91447636 A	75	#include <sys/kauth.h>
91447636 A	76	#include <sys/mount_internal.h>
1c79356b A	77	#include <sys/malloc.h>
1c79356b A	78
2d21ac55 A	79	#include <libkern/OSAtomic.h>
	80
	81	#if CONFIG_MACF
	82	#include <security/mac_framework.h>
	83	#endif
	84
1c79356b A	85	#include "devfs.h"
	86	#include "devfsdefs.h"
	87
b0d623f7 A	88	#if FDESC
	89	#include "fdesc.h"
	90	#endif /* FDESC */
	91
	92
2d21ac55 A	93	static int devfs_statfs( struct mount mp, struct vfsstatfs sbp, vfs_context_t ctx);
2d21ac55 A	94	static int devfs_vfs_getattr(mount_t mp, struct vfs_attr *fsap, vfs_context_t ctx);
1c79356b	95
0c530ab8	96	extern int setup_kmem;
2d21ac55	97	__private_extern__ void devfs_setup_kmem(void);
1c79356b A	98
	99
	100	/*-
	101	* Called from the generic VFS startups.
	102	* This is the second stage of DEVFS initialisation.
	103	* The probed devices have already been loaded and the
	104	* basic structure of the DEVFS created.
	105	* We take the oportunity to mount the hidden DEVFS layer, so that
	106	* devices from devfs get sync'd.
	107	*/
	108	static int
b0d623f7	109	devfs_init(__unused struct vfsconf *vfsp)
1c79356b	110	{
1c79356b	111	if (devfs_sinit())
91447636	112	return (ENOTSUP);
1c79356b A	113	devfs_make_node(makedev(0, 0), DEVFS_CHAR,
	114	UID_ROOT, GID_WHEEL, 0622, "console");
	115	devfs_make_node(makedev(2, 0), DEVFS_CHAR,
	116	UID_ROOT, GID_WHEEL, 0666, "tty");
0c530ab8 A	117	if (setup_kmem) {
	118	devfs_setup_kmem();
	119	}
1c79356b A	120	devfs_make_node(makedev(3, 2), DEVFS_CHAR,
	121	UID_ROOT, GID_WHEEL, 0666, "null");
	122	devfs_make_node(makedev(3, 3), DEVFS_CHAR,
	123	UID_ROOT, GID_WHEEL, 0666, "zero");
	124	devfs_make_node(makedev(6, 0), DEVFS_CHAR,
	125	UID_ROOT, GID_WHEEL, 0600, "klog");
b0d623f7 A	126
	127	#if FDESC
	128	devfs_fdesc_init();
	129	#endif
	130
1c79356b A	131	return 0;
	132	}
	133
0c530ab8 A	134	__private_extern__ void
	135	devfs_setup_kmem(void)
	136	{
	137	devfs_make_node(makedev(3, 0), DEVFS_CHAR,
	138	UID_ROOT, GID_KMEM, 0640, "mem");
	139	devfs_make_node(makedev(3, 1), DEVFS_CHAR,
	140	UID_ROOT, GID_KMEM, 0640, "kmem");
	141	}
	142
	143
1c79356b A	144	/*-
	145	* mp - pointer to 'mount' structure
	146	* path - addr in user space of mount point (ie /usr or whatever)
	147	* data - addr in user space of mount params including the
	148	* name of the block special file to treat as a filesystem.
	149	* (NOT USED)
	150	* ndp - namei data pointer (NOT USED)
	151	* p - proc pointer
	152	* devfs is special in that it doesn't require any device to be mounted..
	153	* It makes up its data as it goes along.
	154	* it must be mounted during single user.. until it is, only std{in/out/err}
	155	* and the root filesystem are available.
	156	*/
	157	/proto/
	158	int
2d21ac55	159	devfs_mount(struct mount *mp, __unused vnode_t devvp, __unused user_addr_t data, vfs_context_t ctx)
1c79356b A	160	{
	161	struct devfsmount devfs_mp_p; / devfs specific mount info */
	162	int error;
1c79356b A	163
	164	/*-
	165	* If they just want to update, we don't need to do anything.
	166	*/
	167	if (mp->mnt_flag & MNT_UPDATE)
	168	{
	169	return 0;
	170	}
	171
91447636 A	172	/* Advisory locking should be handled at the VFS layer */
	173	vfs_setlocklocal(mp);
	174
1c79356b A	175	/*-
	176	* Well, it's not an update, it's a real mount request.
	177	* Time to get dirty.
	178	* HERE we should check to see if we are already mounted here.
	179	*/
	180
	181	MALLOC(devfs_mp_p, struct devfsmount *, sizeof(struct devfsmount),
	182	M_DEVFSMNT, M_WAITOK);
	183	if (devfs_mp_p == NULL)
	184	return (ENOMEM);
	185	bzero(devfs_mp_p,sizeof(*devfs_mp_p));
	186	devfs_mp_p->mount = mp;
	187
	188	/*-
	189	* Fill out some fields
	190	*/
	191	mp->mnt_data = (qaddr_t)devfs_mp_p;
b0d623f7	192	mp->mnt_vfsstat.f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p;
91447636	193	mp->mnt_vfsstat.f_fsid.val[1] = vfs_typenum(mp);
1c79356b A	194	mp->mnt_flag \|= MNT_LOCAL;
1c79356b A	195
91447636	196	DEVFS_LOCK();
1c79356b	197	error = dev_dup_plane(devfs_mp_p);
91447636 A	198	DEVFS_UNLOCK();
91447636 A	199
1c79356b A	200	if (error) {
	201	mp->mnt_data = (qaddr_t)0;
	202	FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
	203	return (error);
91447636 A	204	} else
91447636 A	205	DEVFS_INCR_MOUNTS();
1c79356b A	206
	207	/*-
	208	* Copy in the name of the directory the filesystem
	209	* is to be mounted on.
	210	* And we clear the remainder of the character strings
	211	* to be tidy.
	212	*/
	213
91447636 A	214	bzero(mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN);
91447636 A	215	bcopy("devfs",mp->mnt_vfsstat.f_mntfromname, 5);
2d21ac55	216	(void)devfs_statfs(mp, &mp->mnt_vfsstat, ctx);
91447636	217
1c79356b A	218	return 0;
	219	}
	220
	221
	222	static int
2d21ac55	223	devfs_start(__unused struct mount *mp, __unused int flags, __unused vfs_context_t ctx)
1c79356b A	224	{
	225	return 0;
	226	}
	227
	228	/*-
	229	* Unmount the filesystem described by mp.
	230	*/
	231	static int
2d21ac55	232	devfs_unmount( struct mount *mp, int mntflags, __unused vfs_context_t ctx)
1c79356b A	233	{
	234	struct devfsmount devfs_mp_p = (struct devfsmount )mp->mnt_data;
	235	int flags = 0;
9bccf70c	236	int force = 0;
1c79356b A	237	int error;
	238
	239	if (mntflags & MNT_FORCE) {
	240	flags \|= FORCECLOSE;
9bccf70c	241	force = 1;
1c79356b A	242	}
1c79356b A	243	error = vflush(mp, NULLVP, flags);
9bccf70c	244	if (error && !force)
1c79356b A	245	return error;
1c79356b A	246
91447636	247	DEVFS_LOCK();
1c79356b	248	devfs_free_plane(devfs_mp_p);
91447636 A	249	DEVFS_UNLOCK();
91447636 A	250
1c79356b	251	DEVFS_DECR_MOUNTS();
91447636 A	252
91447636 A	253	FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
1c79356b A	254	mp->mnt_data = (qaddr_t)0;
	255	mp->mnt_flag &= ~MNT_LOCAL;
	256
	257	return 0;
	258	}
	259
	260	/* return the address of the root vnode in vpp /
	261	static int
2d21ac55	262	devfs_root(struct mount mp, struct vnode *vpp, __unused vfs_context_t ctx)
1c79356b A	263	{
	264	struct devfsmount devfs_mp_p = (struct devfsmount )(mp->mnt_data);
	265	int error;
	266
91447636	267	DEVFS_LOCK();
2d21ac55 A	268	/* last parameter to devfs_dntovn() is ignored */
2d21ac55 A	269	error = devfs_dntovn(devfs_mp_p->plane_root->de_dnp, vpp, NULL);
91447636	270	DEVFS_UNLOCK();
1c79356b	271
91447636	272	return error;
1c79356b A	273	}
	274
	275	static int
2d21ac55	276	devfs_statfs( struct mount mp, struct vfsstatfs sbp, __unused vfs_context_t ctx)
1c79356b A	277	{
	278	struct devfsmount devfs_mp_p = (struct devfsmount )mp->mnt_data;
	279
	280	/*-
	281	* Fill in the stat block.
	282	*/
91447636	283	//sbp->f_type = mp->mnt_vfsstat.f_type;
1c79356b A	284	sbp->f_flags = 0; /* XXX */
	285	sbp->f_bsize = 512;
	286	sbp->f_iosize = 512;
	287	sbp->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
	288	+ devfs_stats.nodes * sizeof(devnode_t)
	289	+ devfs_stats.entries * sizeof(devdirent_t)
	290	+ devfs_stats.stringspace
	291	) / sbp->f_bsize;
	292	sbp->f_bfree = 0;
	293	sbp->f_bavail = 0;
	294	sbp->f_files = devfs_stats.nodes;
	295	sbp->f_ffree = 0;
b0d623f7	296	sbp->f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p;
91447636	297	sbp->f_fsid.val[1] = vfs_typenum(mp);
1c79356b	298
91447636 A	299	return 0;
	300	}
	301
	302	static int
2d21ac55	303	devfs_vfs_getattr(__unused mount_t mp, struct vfs_attr *fsap, __unused vfs_context_t ctx)
91447636 A	304	{
	305	VFSATTR_RETURN(fsap, f_objcount, devfs_stats.nodes);
	306	VFSATTR_RETURN(fsap, f_maxobjcount, devfs_stats.nodes);
	307	VFSATTR_RETURN(fsap, f_bsize, 512);
	308	VFSATTR_RETURN(fsap, f_iosize, 512);
	309	if (VFSATTR_IS_ACTIVE(fsap, f_blocks) \|\| VFSATTR_IS_ACTIVE(fsap, f_bused)) {
	310	fsap->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
	311	+ devfs_stats.nodes * sizeof(devnode_t)
	312	+ devfs_stats.entries * sizeof(devdirent_t)
	313	+ devfs_stats.stringspace
	314	) / fsap->f_bsize;
	315	fsap->f_bused = fsap->f_blocks;
	316	VFSATTR_SET_SUPPORTED(fsap, f_blocks);
	317	VFSATTR_SET_SUPPORTED(fsap, f_bused);
1c79356b	318	}
91447636 A	319	VFSATTR_RETURN(fsap, f_bfree, 0);
	320	VFSATTR_RETURN(fsap, f_bavail, 0);
	321	VFSATTR_RETURN(fsap, f_files, devfs_stats.nodes);
	322	VFSATTR_RETURN(fsap, f_ffree, 0);
	323	VFSATTR_RETURN(fsap, f_fssubtype, 0);
	324
b0d623f7 A	325	if (VFSATTR_IS_ACTIVE(fsap, f_capabilities)) {
	326	fsap->f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] =
	327	VOL_CAP_FMT_SYMBOLICLINKS \|
	328	VOL_CAP_FMT_HARDLINKS \|
	329	VOL_CAP_FMT_NO_ROOT_TIMES \|
	330	VOL_CAP_FMT_CASE_SENSITIVE \|
	331	VOL_CAP_FMT_CASE_PRESERVING \|
	332	VOL_CAP_FMT_FAST_STATFS \|
	333	VOL_CAP_FMT_2TB_FILESIZE \|
	334	VOL_CAP_FMT_HIDDEN_FILES;
	335	fsap->f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] =
	336	VOL_CAP_INT_ATTRLIST ;
	337	fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED1] = 0;
	338	fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED2] = 0;
	339
	340	fsap->f_capabilities.valid[VOL_CAPABILITIES_FORMAT] =
	341	VOL_CAP_FMT_PERSISTENTOBJECTIDS \|
	342	VOL_CAP_FMT_SYMBOLICLINKS \|
	343	VOL_CAP_FMT_HARDLINKS \|
	344	VOL_CAP_FMT_JOURNAL \|
	345	VOL_CAP_FMT_JOURNAL_ACTIVE \|
	346	VOL_CAP_FMT_NO_ROOT_TIMES \|
	347	VOL_CAP_FMT_SPARSE_FILES \|
	348	VOL_CAP_FMT_ZERO_RUNS \|
	349	VOL_CAP_FMT_CASE_SENSITIVE \|
	350	VOL_CAP_FMT_CASE_PRESERVING \|
	351	VOL_CAP_FMT_FAST_STATFS \|
	352	VOL_CAP_FMT_2TB_FILESIZE \|
	353	VOL_CAP_FMT_OPENDENYMODES \|
	354	VOL_CAP_FMT_HIDDEN_FILES \|
	355	VOL_CAP_FMT_PATH_FROM_ID \|
	356	VOL_CAP_FMT_NO_VOLUME_SIZES;
	357	fsap->f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] =
	358	VOL_CAP_INT_SEARCHFS \|
	359	VOL_CAP_INT_ATTRLIST \|
	360	VOL_CAP_INT_NFSEXPORT \|
	361	VOL_CAP_INT_READDIRATTR \|
	362	VOL_CAP_INT_EXCHANGEDATA \|
	363	VOL_CAP_INT_COPYFILE \|
	364	VOL_CAP_INT_ALLOCATE \|
	365	VOL_CAP_INT_VOL_RENAME \|
	366	VOL_CAP_INT_ADVLOCK \|
	367	VOL_CAP_INT_FLOCK \|
	368	VOL_CAP_INT_EXTENDED_SECURITY \|
	369	VOL_CAP_INT_USERACCESS \|
	370	VOL_CAP_INT_MANLOCK \|
	371	VOL_CAP_INT_EXTENDED_ATTR \|
	372	VOL_CAP_INT_NAMEDSTREAMS;
	373	fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED1] = 0;
	374	fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED2] = 0;
	375
	376	VFSATTR_SET_SUPPORTED(fsap, f_capabilities);
	377	}
	378
	379	if (VFSATTR_IS_ACTIVE(fsap, f_attributes)) {
	380	fsap->f_attributes.validattr.commonattr =
	381	ATTR_CMN_NAME \| ATTR_CMN_DEVID \| ATTR_CMN_FSID \|
	382	ATTR_CMN_OBJTYPE \| ATTR_CMN_OBJTAG \| ATTR_CMN_OBJID \|
	383	ATTR_CMN_PAROBJID \|
	384	ATTR_CMN_MODTIME \| ATTR_CMN_CHGTIME \| ATTR_CMN_ACCTIME \|
	385	ATTR_CMN_OWNERID \| ATTR_CMN_GRPID \| ATTR_CMN_ACCESSMASK \|
	386	ATTR_CMN_FLAGS \| ATTR_CMN_USERACCESS \| ATTR_CMN_FILEID;
	387	fsap->f_attributes.validattr.volattr =
	388	ATTR_VOL_FSTYPE \| ATTR_VOL_SIZE \| ATTR_VOL_SPACEFREE \|
389	ATTR_VOL_SPACEAVAIL \| ATTR_VOL_MINALLOCATION \|
390	ATTR_VOL_OBJCOUNT \| ATTR_VOL_MAXOBJCOUNT \|
391	ATTR_VOL_MOUNTPOINT \| ATTR_VOL_MOUNTFLAGS \|
392	ATTR_VOL_MOUNTEDDEVICE \| ATTR_VOL_CAPABILITIES \|
393	ATTR_VOL_ATTRIBUTES;
394	fsap->f_attributes.validattr.dirattr =
395	ATTR_DIR_LINKCOUNT \| ATTR_DIR_MOUNTSTATUS;
396	fsap->f_attributes.validattr.fileattr =
397	ATTR_FILE_LINKCOUNT \| ATTR_FILE_TOTALSIZE \|
398	ATTR_FILE_IOBLOCKSIZE \| ATTR_FILE_DEVTYPE \|
399	ATTR_FILE_DATALENGTH;
400	fsap->f_attributes.validattr.forkattr = 0;
401
402	fsap->f_attributes.nativeattr.commonattr =
403	ATTR_CMN_NAME \| ATTR_CMN_DEVID \| ATTR_CMN_FSID \|
404	ATTR_CMN_OBJTYPE \| ATTR_CMN_OBJTAG \| ATTR_CMN_OBJID \|
405	ATTR_CMN_PAROBJID \|
406	ATTR_CMN_MODTIME \| ATTR_CMN_CHGTIME \| ATTR_CMN_ACCTIME \|
407	ATTR_CMN_OWNERID \| ATTR_CMN_GRPID \| ATTR_CMN_ACCESSMASK \|
408	ATTR_CMN_FLAGS \| ATTR_CMN_USERACCESS \| ATTR_CMN_FILEID;
409	fsap->f_attributes.nativeattr.volattr =
410	ATTR_VOL_FSTYPE \| ATTR_VOL_SIZE \| ATTR_VOL_SPACEFREE \|
411	ATTR_VOL_SPACEAVAIL \| ATTR_VOL_MINALLOCATION \|
412	ATTR_VOL_OBJCOUNT \| ATTR_VOL_MAXOBJCOUNT \|
413	ATTR_VOL_MOUNTPOINT \| ATTR_VOL_MOUNTFLAGS \|
414	ATTR_VOL_MOUNTEDDEVICE \| ATTR_VOL_CAPABILITIES \|
415	ATTR_VOL_ATTRIBUTES;
416	fsap->f_attributes.nativeattr.dirattr =
417	ATTR_DIR_MOUNTSTATUS;
418	fsap->f_attributes.nativeattr.fileattr =
419	ATTR_FILE_LINKCOUNT \| ATTR_FILE_TOTALSIZE \|
420	ATTR_FILE_IOBLOCKSIZE \| ATTR_FILE_DEVTYPE \|
421	ATTR_FILE_DATALENGTH;
422	fsap->f_attributes.nativeattr.forkattr = 0;
423
424	VFSATTR_SET_SUPPORTED(fsap, f_attributes);
425	}
426
1c79356b A	427	return 0;
	428	}
	429
	430	static int
2d21ac55	431	devfs_sync(__unused struct mount *mp, __unused int waitfor, __unused vfs_context_t ctx)
1c79356b A	432	{
	433	return (0);
	434	}
	435
	436
	437	static int
2d21ac55	438	devfs_vget(__unused struct mount mp, __unused ino64_t ino, __unused struct vnode *vpp, __unused vfs_context_t ctx)
1c79356b	439	{
91447636	440	return ENOTSUP;
1c79356b A	441	}
	442
	443	/*************************************************************
	444	* The concept of exporting a kernel generated devfs is stupid
	445	* So don't handle filehandles
	446	*/
	447
	448	static int
2d21ac55	449	devfs_fhtovp (__unused struct mount mp, __unused int fhlen, __unused unsigned char fhp, __unused struct vnode **vpp, __unused vfs_context_t ctx)
1c79356b A	450	{
	451	return (EINVAL);
	452	}
	453
	454
	455	static int
2d21ac55	456	devfs_vptofh (__unused struct vnode vp, __unused int fhlenp, __unused unsigned char *fhp, __unused vfs_context_t ctx)
1c79356b A	457	{
	458	return (EINVAL);
	459	}
	460
	461	static int
91447636 A	462	devfs_sysctl(__unused int *name, __unused u_int namelen, __unused user_addr_t oldp,
91447636 A	463	__unused size_t *oldlenp, __unused user_addr_t newp,
2d21ac55	464	__unused size_t newlen, __unused vfs_context_t ctx)
1c79356b	465	{
91447636	466	return (ENOTSUP);
1c79356b A	467	}
	468
	469	#include <sys/namei.h>
	470
	471	/*
	472	* Function: devfs_kernel_mount
	473	* Purpose:
	474	* Mount devfs at the given mount point from within the kernel.
	475	*/
	476	int
	477	devfs_kernel_mount(char * mntname)
	478	{
	479	struct mount *mp;
	480	int error;
1c79356b A	481	struct nameidata nd;
1c79356b A	482	struct vnode * vp;
2d21ac55	483	vfs_context_t ctx = vfs_context_kernel();
b0d623f7	484	struct vfstable *vfsp;
1c79356b	485
b0d623f7 A	486	/* Find our vfstable entry */
	487	for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
	488	if (!strncmp(vfsp->vfc_name, "devfs", sizeof(vfsp->vfc_name)))
	489	break;
	490
	491	if (!vfsp) {
	492	panic("Could not find entry in vfsconf for devfs.\n");
	493	}
1c79356b A	494
	495	/*
	496	* Get vnode to be covered
	497	*/
b0d623f7	498	NDINIT(&nd, LOOKUP, FOLLOW \| LOCKLEAF, UIO_SYSSPACE,
2d21ac55	499	CAST_USER_ADDR_T(mntname), ctx);
1c79356b A	500	if ((error = namei(&nd))) {
	501	printf("devfs_kernel_mount: failed to find directory '%s', %d",
	502	mntname, error);
	503	return (error);
	504	}
91447636	505	nameidone(&nd);
1c79356b	506	vp = nd.ni_vp;
91447636	507
2d21ac55	508	if ((error = VNOP_FSYNC(vp, MNT_WAIT, ctx))) {
91447636 A	509	printf("devfs_kernel_mount: vnop_fsync failed: %d\n", error);
91447636 A	510	vnode_put(vp);
1c79356b A	511	return (error);
1c79356b A	512	}
91447636 A	513	if ((error = buf_invalidateblks(vp, BUF_WRITE_DATA, 0, 0))) {
	514	printf("devfs_kernel_mount: buf_invalidateblks failed: %d\n", error);
	515	vnode_put(vp);
	516	return (error);
	517	}
	518	if (vnode_isdir(vp) == 0) {
1c79356b	519	printf("devfs_kernel_mount: '%s' is not a directory\n", mntname);
91447636	520	vnode_put(vp);
1c79356b A	521	return (ENOTDIR);
1c79356b A	522	}
91447636 A	523	if ((vnode_mountedhere(vp))) {
91447636 A	524	vnode_put(vp);
1c79356b A	525	return (EBUSY);
	526	}
	527
	528	/*
	529	* Allocate and initialize the filesystem.
	530	*/
b0d623f7	531	MALLOC_ZONE(mp, struct mount *, sizeof(struct mount),
55e303ae	532	M_MOUNT, M_WAITOK);
b0d623f7	533	bzero((char *)mp, sizeof(struct mount));
0b4e3aa0	534
91447636 A	535	/* Initialize the default IO constraints */
	536	mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
	537	mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
2d21ac55 A	538	mp->mnt_ioflags = 0;
	539	mp->mnt_realrootvp = NULLVP;
	540	mp->mnt_authcache_ttl = CACHED_LOOKUP_RIGHT_TTL;
91447636 A	541
	542	mount_lock_init(mp);
	543	TAILQ_INIT(&mp->mnt_vnodelist);
	544	TAILQ_INIT(&mp->mnt_workerqueue);
	545	TAILQ_INIT(&mp->mnt_newvnodes);
0b4e3aa0	546
91447636	547	(void)vfs_busy(mp, LK_NOWAIT);
b0d623f7 A	548	mp->mnt_op = &devfs_vfsops;
b0d623f7 A	549	mp->mnt_vtable = vfsp;
1c79356b	550	mp->mnt_flag = 0;
b0d623f7 A	551	mp->mnt_flag \|= vfsp->vfc_flags & MNT_VISFLAGMASK;
b0d623f7 A	552	strlcpy(mp->mnt_vfsstat.f_fstypename, vfsp->vfc_name, MFSTYPENAMELEN);
1c79356b A	553	vp->v_mountedhere = mp;
1c79356b A	554	mp->mnt_vnodecovered = vp;
91447636 A	555	mp->mnt_vfsstat.f_owner = kauth_cred_getuid(kauth_cred_get());
91447636 A	556	(void) copystr(mntname, mp->mnt_vfsstat.f_mntonname, MAXPATHLEN - 1, 0);
2d21ac55 A	557	#if CONFIG_MACF
	558	mac_mount_label_init(mp);
	559	mac_mount_label_associate(ctx, mp);
	560	#endif
91447636	561
2d21ac55	562	error = devfs_mount(mp, NULL, USER_ADDR_NULL, ctx);
1c79356b	563
1c79356b A	564	if (error) {
1c79356b A	565	printf("devfs_kernel_mount: mount %s failed: %d", mntname, error);
91447636	566	mp->mnt_vtable->vfc_refcount--;
55e303ae	567
91447636	568	vfs_unbusy(mp);
55e303ae	569
91447636	570	mount_lock_destroy(mp);
2d21ac55 A	571	#if CONFIG_MACF
	572	mac_mount_label_destroy(mp);
	573	#endif
55e303ae	574	FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
91447636	575	vnode_put(vp);
1c79356b A	576	return (error);
1c79356b A	577	}
91447636 A	578	vnode_ref(vp);
	579	vnode_put(vp);
	580	vfs_unbusy(mp);
	581	mount_list_add(mp);
1c79356b A	582	return (0);
	583	}
	584
	585	struct vfsops devfs_vfsops = {
	586	devfs_mount,
	587	devfs_start,
	588	devfs_unmount,
	589	devfs_root,
91447636 A	590	NULL, /* quotactl */
91447636 A	591	devfs_vfs_getattr,
1c79356b A	592	devfs_sync,
	593	devfs_vget,
	594	devfs_fhtovp,
	595	devfs_vptofh,
	596	devfs_init,
2d21ac55 A	597	devfs_sysctl,
	598	NULL,
	599	{NULL}
1c79356b	600	};