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

/*
 * Copyright (c) 2000-2010 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);

#if !defined(SECURE_KERNEL)
extern int setup_kmem;
__private_extern__ void devfs_setup_kmem(void);
#endif

/*-
 * 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 !defined(SECURE_KERNEL)
    if (setup_kmem) {
    	devfs_setup_kmem();
    }
#endif
    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;
}

#if !defined(SECURE_KERNEL)
__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");
}
#endif


/*-
 *  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, OP_MOUNT, 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	/*
6d2010ae	2	* Copyright (c) 2000-2010 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
6d2010ae	96	#if !defined(SECURE_KERNEL)
0c530ab8	97	extern int setup_kmem;
2d21ac55	98	__private_extern__ void devfs_setup_kmem(void);
6d2010ae	99	#endif
1c79356b A	100
	101	/*-
	102	* Called from the generic VFS startups.
	103	* This is the second stage of DEVFS initialisation.
	104	* The probed devices have already been loaded and the
	105	* basic structure of the DEVFS created.
	106	* We take the oportunity to mount the hidden DEVFS layer, so that
	107	* devices from devfs get sync'd.
	108	*/
	109	static int
b0d623f7	110	devfs_init(__unused struct vfsconf *vfsp)
1c79356b	111	{
1c79356b	112	if (devfs_sinit())
91447636	113	return (ENOTSUP);
1c79356b A	114	devfs_make_node(makedev(0, 0), DEVFS_CHAR,
	115	UID_ROOT, GID_WHEEL, 0622, "console");
	116	devfs_make_node(makedev(2, 0), DEVFS_CHAR,
	117	UID_ROOT, GID_WHEEL, 0666, "tty");
6d2010ae	118	#if !defined(SECURE_KERNEL)
0c530ab8 A	119	if (setup_kmem) {
	120	devfs_setup_kmem();
	121	}
6d2010ae	122	#endif
1c79356b A	123	devfs_make_node(makedev(3, 2), DEVFS_CHAR,
	124	UID_ROOT, GID_WHEEL, 0666, "null");
	125	devfs_make_node(makedev(3, 3), DEVFS_CHAR,
	126	UID_ROOT, GID_WHEEL, 0666, "zero");
	127	devfs_make_node(makedev(6, 0), DEVFS_CHAR,
	128	UID_ROOT, GID_WHEEL, 0600, "klog");
b0d623f7 A	129
	130	#if FDESC
	131	devfs_fdesc_init();
	132	#endif
	133
1c79356b A	134	return 0;
	135	}
	136
6d2010ae	137	#if !defined(SECURE_KERNEL)
0c530ab8 A	138	__private_extern__ void
	139	devfs_setup_kmem(void)
	140	{
	141	devfs_make_node(makedev(3, 0), DEVFS_CHAR,
	142	UID_ROOT, GID_KMEM, 0640, "mem");
	143	devfs_make_node(makedev(3, 1), DEVFS_CHAR,
	144	UID_ROOT, GID_KMEM, 0640, "kmem");
	145	}
6d2010ae	146	#endif
0c530ab8 A	147
0c530ab8 A	148
1c79356b A	149	/*-
	150	* mp - pointer to 'mount' structure
	151	* path - addr in user space of mount point (ie /usr or whatever)
	152	* data - addr in user space of mount params including the
	153	* name of the block special file to treat as a filesystem.
	154	* (NOT USED)
	155	* ndp - namei data pointer (NOT USED)
	156	* p - proc pointer
	157	* devfs is special in that it doesn't require any device to be mounted..
	158	* It makes up its data as it goes along.
	159	* it must be mounted during single user.. until it is, only std{in/out/err}
	160	* and the root filesystem are available.
	161	*/
	162	/proto/
	163	int
2d21ac55	164	devfs_mount(struct mount *mp, __unused vnode_t devvp, __unused user_addr_t data, vfs_context_t ctx)
1c79356b A	165	{
	166	struct devfsmount devfs_mp_p; / devfs specific mount info */
	167	int error;
1c79356b A	168
	169	/*-
	170	* If they just want to update, we don't need to do anything.
	171	*/
	172	if (mp->mnt_flag & MNT_UPDATE)
	173	{
	174	return 0;
	175	}
	176
91447636 A	177	/* Advisory locking should be handled at the VFS layer */
	178	vfs_setlocklocal(mp);
	179
1c79356b A	180	/*-
	181	* Well, it's not an update, it's a real mount request.
	182	* Time to get dirty.
	183	* HERE we should check to see if we are already mounted here.
	184	*/
	185
	186	MALLOC(devfs_mp_p, struct devfsmount *, sizeof(struct devfsmount),
	187	M_DEVFSMNT, M_WAITOK);
	188	if (devfs_mp_p == NULL)
	189	return (ENOMEM);
	190	bzero(devfs_mp_p,sizeof(*devfs_mp_p));
	191	devfs_mp_p->mount = mp;
	192
	193	/*-
	194	* Fill out some fields
	195	*/
	196	mp->mnt_data = (qaddr_t)devfs_mp_p;
b0d623f7	197	mp->mnt_vfsstat.f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p;
91447636	198	mp->mnt_vfsstat.f_fsid.val[1] = vfs_typenum(mp);
1c79356b A	199	mp->mnt_flag \|= MNT_LOCAL;
1c79356b A	200
91447636	201	DEVFS_LOCK();
1c79356b	202	error = dev_dup_plane(devfs_mp_p);
91447636 A	203	DEVFS_UNLOCK();
91447636 A	204
1c79356b A	205	if (error) {
	206	mp->mnt_data = (qaddr_t)0;
	207	FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
	208	return (error);
91447636 A	209	} else
91447636 A	210	DEVFS_INCR_MOUNTS();
1c79356b A	211
	212	/*-
	213	* Copy in the name of the directory the filesystem
	214	* is to be mounted on.
	215	* And we clear the remainder of the character strings
	216	* to be tidy.
	217	*/
	218
91447636 A	219	bzero(mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN);
91447636 A	220	bcopy("devfs",mp->mnt_vfsstat.f_mntfromname, 5);
2d21ac55	221	(void)devfs_statfs(mp, &mp->mnt_vfsstat, ctx);
91447636	222
1c79356b A	223	return 0;
	224	}
	225
	226
	227	static int
2d21ac55	228	devfs_start(__unused struct mount *mp, __unused int flags, __unused vfs_context_t ctx)
1c79356b A	229	{
	230	return 0;
	231	}
	232
	233	/*-
	234	* Unmount the filesystem described by mp.
	235	*/
	236	static int
2d21ac55	237	devfs_unmount( struct mount *mp, int mntflags, __unused vfs_context_t ctx)
1c79356b A	238	{
	239	struct devfsmount devfs_mp_p = (struct devfsmount )mp->mnt_data;
	240	int flags = 0;
9bccf70c	241	int force = 0;
1c79356b A	242	int error;
	243
	244	if (mntflags & MNT_FORCE) {
	245	flags \|= FORCECLOSE;
9bccf70c	246	force = 1;
1c79356b A	247	}
1c79356b A	248	error = vflush(mp, NULLVP, flags);
9bccf70c	249	if (error && !force)
1c79356b A	250	return error;
1c79356b A	251
91447636	252	DEVFS_LOCK();
1c79356b	253	devfs_free_plane(devfs_mp_p);
91447636 A	254	DEVFS_UNLOCK();
91447636 A	255
1c79356b	256	DEVFS_DECR_MOUNTS();
91447636 A	257
91447636 A	258	FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
1c79356b A	259	mp->mnt_data = (qaddr_t)0;
	260	mp->mnt_flag &= ~MNT_LOCAL;
	261
	262	return 0;
	263	}
	264
	265	/* return the address of the root vnode in vpp /
	266	static int
2d21ac55	267	devfs_root(struct mount mp, struct vnode *vpp, __unused vfs_context_t ctx)
1c79356b A	268	{
	269	struct devfsmount devfs_mp_p = (struct devfsmount )(mp->mnt_data);
	270	int error;
	271
91447636	272	DEVFS_LOCK();
2d21ac55 A	273	/* last parameter to devfs_dntovn() is ignored */
2d21ac55 A	274	error = devfs_dntovn(devfs_mp_p->plane_root->de_dnp, vpp, NULL);
91447636	275	DEVFS_UNLOCK();
1c79356b	276
91447636	277	return error;
1c79356b A	278	}
	279
	280	static int
2d21ac55	281	devfs_statfs( struct mount mp, struct vfsstatfs sbp, __unused vfs_context_t ctx)
1c79356b A	282	{
	283	struct devfsmount devfs_mp_p = (struct devfsmount )mp->mnt_data;
	284
	285	/*-
	286	* Fill in the stat block.
	287	*/
91447636	288	//sbp->f_type = mp->mnt_vfsstat.f_type;
1c79356b A	289	sbp->f_flags = 0; /* XXX */
	290	sbp->f_bsize = 512;
	291	sbp->f_iosize = 512;
	292	sbp->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
	293	+ devfs_stats.nodes * sizeof(devnode_t)
	294	+ devfs_stats.entries * sizeof(devdirent_t)
	295	+ devfs_stats.stringspace
	296	) / sbp->f_bsize;
	297	sbp->f_bfree = 0;
	298	sbp->f_bavail = 0;
	299	sbp->f_files = devfs_stats.nodes;
	300	sbp->f_ffree = 0;
b0d623f7	301	sbp->f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p;
91447636	302	sbp->f_fsid.val[1] = vfs_typenum(mp);
1c79356b	303
91447636 A	304	return 0;
	305	}
	306
	307	static int
2d21ac55	308	devfs_vfs_getattr(__unused mount_t mp, struct vfs_attr *fsap, __unused vfs_context_t ctx)
91447636 A	309	{
	310	VFSATTR_RETURN(fsap, f_objcount, devfs_stats.nodes);
	311	VFSATTR_RETURN(fsap, f_maxobjcount, devfs_stats.nodes);
	312	VFSATTR_RETURN(fsap, f_bsize, 512);
	313	VFSATTR_RETURN(fsap, f_iosize, 512);
	314	if (VFSATTR_IS_ACTIVE(fsap, f_blocks) \|\| VFSATTR_IS_ACTIVE(fsap, f_bused)) {
	315	fsap->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
	316	+ devfs_stats.nodes * sizeof(devnode_t)
	317	+ devfs_stats.entries * sizeof(devdirent_t)
	318	+ devfs_stats.stringspace
	319	) / fsap->f_bsize;
	320	fsap->f_bused = fsap->f_blocks;
	321	VFSATTR_SET_SUPPORTED(fsap, f_blocks);
	322	VFSATTR_SET_SUPPORTED(fsap, f_bused);
1c79356b	323	}
91447636 A	324	VFSATTR_RETURN(fsap, f_bfree, 0);
	325	VFSATTR_RETURN(fsap, f_bavail, 0);
	326	VFSATTR_RETURN(fsap, f_files, devfs_stats.nodes);
	327	VFSATTR_RETURN(fsap, f_ffree, 0);
	328	VFSATTR_RETURN(fsap, f_fssubtype, 0);
	329
b0d623f7 A	330	if (VFSATTR_IS_ACTIVE(fsap, f_capabilities)) {
	331	fsap->f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] =
	332	VOL_CAP_FMT_SYMBOLICLINKS \|
	333	VOL_CAP_FMT_HARDLINKS \|
	334	VOL_CAP_FMT_NO_ROOT_TIMES \|
	335	VOL_CAP_FMT_CASE_SENSITIVE \|
	336	VOL_CAP_FMT_CASE_PRESERVING \|
	337	VOL_CAP_FMT_FAST_STATFS \|
	338	VOL_CAP_FMT_2TB_FILESIZE \|
	339	VOL_CAP_FMT_HIDDEN_FILES;
	340	fsap->f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] =
	341	VOL_CAP_INT_ATTRLIST ;
	342	fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED1] = 0;
	343	fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED2] = 0;
	344
	345	fsap->f_capabilities.valid[VOL_CAPABILITIES_FORMAT] =
	346	VOL_CAP_FMT_PERSISTENTOBJECTIDS \|
	347	VOL_CAP_FMT_SYMBOLICLINKS \|
	348	VOL_CAP_FMT_HARDLINKS \|
	349	VOL_CAP_FMT_JOURNAL \|
	350	VOL_CAP_FMT_JOURNAL_ACTIVE \|
	351	VOL_CAP_FMT_NO_ROOT_TIMES \|
	352	VOL_CAP_FMT_SPARSE_FILES \|
	353	VOL_CAP_FMT_ZERO_RUNS \|
	354	VOL_CAP_FMT_CASE_SENSITIVE \|
	355	VOL_CAP_FMT_CASE_PRESERVING \|
	356	VOL_CAP_FMT_FAST_STATFS \|
	357	VOL_CAP_FMT_2TB_FILESIZE \|
	358	VOL_CAP_FMT_OPENDENYMODES \|
	359	VOL_CAP_FMT_HIDDEN_FILES \|
	360	VOL_CAP_FMT_PATH_FROM_ID \|
	361	VOL_CAP_FMT_NO_VOLUME_SIZES;
	362	fsap->f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] =
	363	VOL_CAP_INT_SEARCHFS \|
	364	VOL_CAP_INT_ATTRLIST \|
	365	VOL_CAP_INT_NFSEXPORT \|
	366	VOL_CAP_INT_READDIRATTR \|
	367	VOL_CAP_INT_EXCHANGEDATA \|
	368	VOL_CAP_INT_COPYFILE \|
	369	VOL_CAP_INT_ALLOCATE \|
	370	VOL_CAP_INT_VOL_RENAME \|
	371	VOL_CAP_INT_ADVLOCK \|
	372	VOL_CAP_INT_FLOCK \|
	373	VOL_CAP_INT_EXTENDED_SECURITY \|
	374	VOL_CAP_INT_USERACCESS \|
	375	VOL_CAP_INT_MANLOCK \|
	376	VOL_CAP_INT_EXTENDED_ATTR \|
	377	VOL_CAP_INT_NAMEDSTREAMS;
	378	fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED1] = 0;
	379	fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED2] = 0;
	380
	381	VFSATTR_SET_SUPPORTED(fsap, f_capabilities);
	382	}
	383
	384	if (VFSATTR_IS_ACTIVE(fsap, f_attributes)) {
	385	fsap->f_attributes.validattr.commonattr =
	386	ATTR_CMN_NAME \| ATTR_CMN_DEVID \| ATTR_CMN_FSID \|
	387	ATTR_CMN_OBJTYPE \| ATTR_CMN_OBJTAG \| ATTR_CMN_OBJID \|
	388	ATTR_CMN_PAROBJID \|
	389	ATTR_CMN_MODTIME \| ATTR_CMN_CHGTIME \| ATTR_CMN_ACCTIME \|
	390	ATTR_CMN_OWNERID \| ATTR_CMN_GRPID \| ATTR_CMN_ACCESSMASK \|
	391	ATTR_CMN_FLAGS \| ATTR_CMN_USERACCESS \| ATTR_CMN_FILEID;
	392	fsap->f_attributes.validattr.volattr =
	393	ATTR_VOL_FSTYPE \| ATTR_VOL_SIZE \| ATTR_VOL_SPACEFREE \|
394	ATTR_VOL_SPACEAVAIL \| ATTR_VOL_MINALLOCATION \|
395	ATTR_VOL_OBJCOUNT \| ATTR_VOL_MAXOBJCOUNT \|
396	ATTR_VOL_MOUNTPOINT \| ATTR_VOL_MOUNTFLAGS \|
397	ATTR_VOL_MOUNTEDDEVICE \| ATTR_VOL_CAPABILITIES \|
398	ATTR_VOL_ATTRIBUTES;
399	fsap->f_attributes.validattr.dirattr =
400	ATTR_DIR_LINKCOUNT \| ATTR_DIR_MOUNTSTATUS;
401	fsap->f_attributes.validattr.fileattr =
402	ATTR_FILE_LINKCOUNT \| ATTR_FILE_TOTALSIZE \|
403	ATTR_FILE_IOBLOCKSIZE \| ATTR_FILE_DEVTYPE \|
404	ATTR_FILE_DATALENGTH;
405	fsap->f_attributes.validattr.forkattr = 0;
406
407	fsap->f_attributes.nativeattr.commonattr =
408	ATTR_CMN_NAME \| ATTR_CMN_DEVID \| ATTR_CMN_FSID \|
409	ATTR_CMN_OBJTYPE \| ATTR_CMN_OBJTAG \| ATTR_CMN_OBJID \|
410	ATTR_CMN_PAROBJID \|
411	ATTR_CMN_MODTIME \| ATTR_CMN_CHGTIME \| ATTR_CMN_ACCTIME \|
412	ATTR_CMN_OWNERID \| ATTR_CMN_GRPID \| ATTR_CMN_ACCESSMASK \|
413	ATTR_CMN_FLAGS \| ATTR_CMN_USERACCESS \| ATTR_CMN_FILEID;
414	fsap->f_attributes.nativeattr.volattr =
415	ATTR_VOL_FSTYPE \| ATTR_VOL_SIZE \| ATTR_VOL_SPACEFREE \|
416	ATTR_VOL_SPACEAVAIL \| ATTR_VOL_MINALLOCATION \|
417	ATTR_VOL_OBJCOUNT \| ATTR_VOL_MAXOBJCOUNT \|
418	ATTR_VOL_MOUNTPOINT \| ATTR_VOL_MOUNTFLAGS \|
419	ATTR_VOL_MOUNTEDDEVICE \| ATTR_VOL_CAPABILITIES \|
420	ATTR_VOL_ATTRIBUTES;
421	fsap->f_attributes.nativeattr.dirattr =
422	ATTR_DIR_MOUNTSTATUS;
423	fsap->f_attributes.nativeattr.fileattr =
424	ATTR_FILE_LINKCOUNT \| ATTR_FILE_TOTALSIZE \|
425	ATTR_FILE_IOBLOCKSIZE \| ATTR_FILE_DEVTYPE \|
426	ATTR_FILE_DATALENGTH;
427	fsap->f_attributes.nativeattr.forkattr = 0;
428
429	VFSATTR_SET_SUPPORTED(fsap, f_attributes);
430	}
431
1c79356b A	432	return 0;
	433	}
	434
	435	static int
2d21ac55	436	devfs_sync(__unused struct mount *mp, __unused int waitfor, __unused vfs_context_t ctx)
1c79356b A	437	{
	438	return (0);
	439	}
	440
	441
	442	static int
2d21ac55	443	devfs_vget(__unused struct mount mp, __unused ino64_t ino, __unused struct vnode *vpp, __unused vfs_context_t ctx)
1c79356b	444	{
91447636	445	return ENOTSUP;
1c79356b A	446	}
	447
	448	/*************************************************************
	449	* The concept of exporting a kernel generated devfs is stupid
	450	* So don't handle filehandles
	451	*/
	452
	453	static int
2d21ac55	454	devfs_fhtovp (__unused struct mount mp, __unused int fhlen, __unused unsigned char fhp, __unused struct vnode **vpp, __unused vfs_context_t ctx)
1c79356b A	455	{
	456	return (EINVAL);
	457	}
	458
	459
	460	static int
2d21ac55	461	devfs_vptofh (__unused struct vnode vp, __unused int fhlenp, __unused unsigned char *fhp, __unused vfs_context_t ctx)
1c79356b A	462	{
	463	return (EINVAL);
	464	}
	465
	466	static int
91447636 A	467	devfs_sysctl(__unused int *name, __unused u_int namelen, __unused user_addr_t oldp,
91447636 A	468	__unused size_t *oldlenp, __unused user_addr_t newp,
2d21ac55	469	__unused size_t newlen, __unused vfs_context_t ctx)
1c79356b	470	{
91447636	471	return (ENOTSUP);
1c79356b A	472	}
	473
	474	#include <sys/namei.h>
	475
	476	/*
	477	* Function: devfs_kernel_mount
	478	* Purpose:
	479	* Mount devfs at the given mount point from within the kernel.
	480	*/
	481	int
	482	devfs_kernel_mount(char * mntname)
	483	{
	484	struct mount *mp;
	485	int error;
1c79356b A	486	struct nameidata nd;
1c79356b A	487	struct vnode * vp;
2d21ac55	488	vfs_context_t ctx = vfs_context_kernel();
b0d623f7	489	struct vfstable *vfsp;
1c79356b	490
b0d623f7 A	491	/* Find our vfstable entry */
	492	for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
	493	if (!strncmp(vfsp->vfc_name, "devfs", sizeof(vfsp->vfc_name)))
	494	break;
	495
	496	if (!vfsp) {
	497	panic("Could not find entry in vfsconf for devfs.\n");
	498	}
1c79356b A	499
	500	/*
	501	* Get vnode to be covered
	502	*/
6d2010ae	503	NDINIT(&nd, LOOKUP, OP_MOUNT, FOLLOW \| LOCKLEAF, UIO_SYSSPACE,
2d21ac55	504	CAST_USER_ADDR_T(mntname), ctx);
1c79356b A	505	if ((error = namei(&nd))) {
	506	printf("devfs_kernel_mount: failed to find directory '%s', %d",
	507	mntname, error);
	508	return (error);
	509	}
91447636	510	nameidone(&nd);
1c79356b	511	vp = nd.ni_vp;
91447636	512
2d21ac55	513	if ((error = VNOP_FSYNC(vp, MNT_WAIT, ctx))) {
91447636 A	514	printf("devfs_kernel_mount: vnop_fsync failed: %d\n", error);
91447636 A	515	vnode_put(vp);
1c79356b A	516	return (error);
1c79356b A	517	}
91447636 A	518	if ((error = buf_invalidateblks(vp, BUF_WRITE_DATA, 0, 0))) {
	519	printf("devfs_kernel_mount: buf_invalidateblks failed: %d\n", error);
	520	vnode_put(vp);
	521	return (error);
	522	}
	523	if (vnode_isdir(vp) == 0) {
1c79356b	524	printf("devfs_kernel_mount: '%s' is not a directory\n", mntname);
91447636	525	vnode_put(vp);
1c79356b A	526	return (ENOTDIR);
1c79356b A	527	}
91447636 A	528	if ((vnode_mountedhere(vp))) {
91447636 A	529	vnode_put(vp);
1c79356b A	530	return (EBUSY);
	531	}
	532
	533	/*
	534	* Allocate and initialize the filesystem.
	535	*/
b0d623f7	536	MALLOC_ZONE(mp, struct mount *, sizeof(struct mount),
55e303ae	537	M_MOUNT, M_WAITOK);
b0d623f7	538	bzero((char *)mp, sizeof(struct mount));
0b4e3aa0	539
91447636 A	540	/* Initialize the default IO constraints */
	541	mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
	542	mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
2d21ac55 A	543	mp->mnt_ioflags = 0;
	544	mp->mnt_realrootvp = NULLVP;
	545	mp->mnt_authcache_ttl = CACHED_LOOKUP_RIGHT_TTL;
91447636 A	546
	547	mount_lock_init(mp);
	548	TAILQ_INIT(&mp->mnt_vnodelist);
	549	TAILQ_INIT(&mp->mnt_workerqueue);
	550	TAILQ_INIT(&mp->mnt_newvnodes);
0b4e3aa0	551
91447636	552	(void)vfs_busy(mp, LK_NOWAIT);
b0d623f7 A	553	mp->mnt_op = &devfs_vfsops;
b0d623f7 A	554	mp->mnt_vtable = vfsp;
1c79356b	555	mp->mnt_flag = 0;
b0d623f7 A	556	mp->mnt_flag \|= vfsp->vfc_flags & MNT_VISFLAGMASK;
b0d623f7 A	557	strlcpy(mp->mnt_vfsstat.f_fstypename, vfsp->vfc_name, MFSTYPENAMELEN);
1c79356b A	558	vp->v_mountedhere = mp;
1c79356b A	559	mp->mnt_vnodecovered = vp;
91447636 A	560	mp->mnt_vfsstat.f_owner = kauth_cred_getuid(kauth_cred_get());
91447636 A	561	(void) copystr(mntname, mp->mnt_vfsstat.f_mntonname, MAXPATHLEN - 1, 0);
2d21ac55 A	562	#if CONFIG_MACF
	563	mac_mount_label_init(mp);
	564	mac_mount_label_associate(ctx, mp);
	565	#endif
91447636	566
2d21ac55	567	error = devfs_mount(mp, NULL, USER_ADDR_NULL, ctx);
1c79356b	568
1c79356b A	569	if (error) {
1c79356b A	570	printf("devfs_kernel_mount: mount %s failed: %d", mntname, error);
91447636	571	mp->mnt_vtable->vfc_refcount--;
55e303ae	572
91447636	573	vfs_unbusy(mp);
55e303ae	574
91447636	575	mount_lock_destroy(mp);
2d21ac55 A	576	#if CONFIG_MACF
	577	mac_mount_label_destroy(mp);
	578	#endif
55e303ae	579	FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
91447636	580	vnode_put(vp);
1c79356b A	581	return (error);
1c79356b A	582	}
91447636 A	583	vnode_ref(vp);
	584	vnode_put(vp);
	585	vfs_unbusy(mp);
	586	mount_list_add(mp);
1c79356b A	587	return (0);
	588	}
	589
	590	struct vfsops devfs_vfsops = {
	591	devfs_mount,
	592	devfs_start,
	593	devfs_unmount,
	594	devfs_root,
91447636 A	595	NULL, /* quotactl */
91447636 A	596	devfs_vfs_getattr,
1c79356b A	597	devfs_sync,
	598	devfs_vget,
	599	devfs_fhtovp,
	600	devfs_vptofh,
	601	devfs_init,
2d21ac55 A	602	devfs_sysctl,
	603	NULL,
	604	{NULL}
1c79356b	605	};