xnu-792.22.5.tar.gz

[apple/xnu.git] / bsd / vfs / vfs_vnops.c

/*
 * Copyright (c) 2000-2004 Apple Computer, 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 (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1982, 1986, 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)vfs_vnops.c	8.14 (Berkeley) 6/15/95
 *
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/file_internal.h>
#include <sys/stat.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/mount_internal.h>
#include <sys/namei.h>
#include <sys/vnode_internal.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/ubc.h>
#include <sys/conf.h>
#include <sys/disk.h>
#include <sys/fsevents.h>
#include <sys/kdebug.h>
#include <sys/xattr.h>
#include <sys/ubc_internal.h>
#include <sys/uio_internal.h>
#include <sys/resourcevar.h>

#include <vm/vm_kern.h>
#include <vm/vm_map.h>

#include <miscfs/specfs/specdev.h>



static int vn_closefile(struct fileglob *fp, struct proc *p);
static int vn_ioctl(struct fileproc *fp, u_long com, caddr_t data, struct proc *p);
static int vn_read(struct fileproc *fp, struct uio *uio,
		kauth_cred_t cred, int flags, struct proc *p);
static int vn_write(struct fileproc *fp, struct uio *uio,
		kauth_cred_t cred, int flags, struct proc *p);
static int vn_select( struct fileproc *fp, int which, void * wql, struct proc *p);
static int vn_kqfilt_add(struct fileproc *fp, struct knote *kn, struct proc *p);
#if 0
static int vn_kqfilt_remove(struct vnode *vp, uintptr_t ident, struct proc *p);
#endif

struct 	fileops vnops =
	{ vn_read, vn_write, vn_ioctl, vn_select, vn_closefile, vn_kqfilt_add, 0 };

/*
 * Common code for vnode open operations.
 * Check permissions, and call the VNOP_OPEN or VNOP_CREATE routine.
 *
 * XXX the profusion of interfaces here is probably a bad thing.
 */
int
vn_open(struct nameidata *ndp, int fmode, int cmode)
{
	return(vn_open_modflags(ndp, &fmode, cmode));
}

int
vn_open_modflags(struct nameidata *ndp, int *fmodep, int cmode)
{
	struct vnode_attr va;

	VATTR_INIT(&va);
	VATTR_SET(&va, va_mode, cmode);
	
	return(vn_open_auth(ndp, fmodep, &va));
}

/*
 * Open a file with authorization, updating the contents of the structures
 * pointed to by ndp, fmodep, and vap as necessary to perform the requested
 * operation.  This function is used for both opens of existing files, and
 * creation of new files.
 *
 * Parameters:	ndp			The nami data pointer describing the
 *					file
 *		fmodep			A pointer to an int containg the mode
 *					information to be used for the open
 *		vap			A pointer to the vnode attribute
 *					descriptor to be used for the open
 *
 * Indirect:	*			Contents of the data structures pointed
 *					to by the parameters are modified as
 *					necessary to the requested operation.
 *
 * Returns:	0			Success
 *		!0			errno value
 *
 * Notes:	The kauth_filesec_t in 'vap', if any, is in host byte order.
 *
 *		The contents of '*ndp' will be modified, based on the other
 *		arguments to this function, and to return file and directory
 *		data necessary to satisfy the requested operation.
 *
 *		If the file does not exist and we are creating it, then the
 *		O_TRUNC flag will be cleared in '*fmodep' to indicate to the
 *		caller that the file was not truncated.
 *
 *		If the file exists and the O_EXCL flag was not specified, then
 *		the O_CREAT flag will be cleared in '*fmodep' to indicate to
 *		the caller that the existing file was merely opened rather
 *		than created.
 *
 *		The contents of '*vap' will be modified as necessary to
 *		complete the operation, including setting of supported
 *		attribute, clearing of fields containing unsupported attributes
 *		in the request, if the request proceeds without them, etc..
 *
 * XXX:		This function is too complicated in actings on its arguments
 *
 * XXX:		We should enummerate the possible errno values here, and where
 *		in the code they originated.
 */
int
vn_open_auth(struct nameidata *ndp, int *fmodep, struct vnode_attr *vap)
{
	struct vnode *vp;
	struct vnode *dvp;
	vfs_context_t ctx = ndp->ni_cnd.cn_context;
	int error;
	int fmode;
	kauth_action_t action;

again:
	vp = NULL;
	dvp = NULL;
	fmode = *fmodep;
	if (fmode & O_CREAT) {
	        if ( (fmode & O_DIRECTORY) ) {
		        error = EINVAL;
			goto out;
		}
		ndp->ni_cnd.cn_nameiop = CREATE;
		ndp->ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | AUDITVNPATH1;

		if ((fmode & O_EXCL) == 0)
			ndp->ni_cnd.cn_flags |= FOLLOW;
		if ( (error = namei(ndp)) )
			goto out;
		dvp = ndp->ni_dvp;
		vp = ndp->ni_vp;

 		/* not found, create */
		if (vp == NULL) {
 			/* must have attributes for a new file */
 			if (vap == NULL) {
 				error = EINVAL;
				goto badcreate;
 			}

			/* authorize before creating */
 			if ((error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx)) != 0)
				goto badcreate;

			VATTR_SET(vap, va_type, VREG);
			if (fmode & O_EXCL)
				vap->va_vaflags |= VA_EXCLUSIVE;

			if ((error = vn_create(dvp, &ndp->ni_vp, &ndp->ni_cnd, vap, 0, ctx)) != 0)
				goto badcreate;
			
			vp = ndp->ni_vp;

			if (vp) {
				int	update_flags = 0;

			        // Make sure the name & parent pointers are hooked up
			        if (vp->v_name == NULL)
					update_flags |= VNODE_UPDATE_NAME;
				if (vp->v_parent == NULLVP)
				        update_flags |= VNODE_UPDATE_PARENT;

				if (update_flags)
				        vnode_update_identity(vp, dvp, ndp->ni_cnd.cn_nameptr, ndp->ni_cnd.cn_namelen, ndp->ni_cnd.cn_hash, update_flags);

				if (need_fsevent(FSE_CREATE_FILE, vp)) {
				        add_fsevent(FSE_CREATE_FILE, ctx,
						    FSE_ARG_VNODE, vp,
						    FSE_ARG_DONE);
				}
			}
			/*
			 * nameidone has to happen before we vnode_put(dvp)
			 * and clear the ni_dvp field, since it may need
			 * to release the fs_nodelock on the dvp
			 */
badcreate:
			nameidone(ndp);
			ndp->ni_dvp = NULL;
			vnode_put(dvp);

			if (error) {
				/*
				 * Check for a creation race.
				 */
				if ((error == EEXIST) && !(fmode & O_EXCL)) {
					goto again;
				}
				goto bad;
			}
			fmode &= ~O_TRUNC;
		} else {
			nameidone(ndp);
			ndp->ni_dvp = NULL;
			vnode_put(dvp);

			if (fmode & O_EXCL) {
				error = EEXIST;
				goto bad;
			}
			fmode &= ~O_CREAT;
		}
	} else {
		ndp->ni_cnd.cn_nameiop = LOOKUP;
		ndp->ni_cnd.cn_flags = FOLLOW | LOCKLEAF | AUDITVNPATH1;
		if ( (error = namei(ndp)) )
			goto out;
		vp = ndp->ni_vp;
		nameidone(ndp);
		ndp->ni_dvp = NULL;

		if ( (fmode & O_DIRECTORY) && vp->v_type != VDIR ) {
		        error = ENOTDIR;
			goto bad;
		}
	}
	if (vp->v_type == VSOCK && vp->v_tag != VT_FDESC) {
		error = EOPNOTSUPP;	/* Operation not supported on socket */
		goto bad;
	}

#if DIAGNOSTIC
	if (UBCINFOMISSING(vp))
		panic("vn_open: ubc_info_init");
#endif /* DIAGNOSTIC */

	/* authorize open of an existing file */
	if ((fmode & O_CREAT) == 0) {

		/* disallow write operations on directories */
		if (vnode_isdir(vp) && (fmode & (FWRITE | O_TRUNC))) {
			error = EISDIR;
			goto bad;
		}

		/* compute action to be authorized */
		action = 0;
		if (fmode & FREAD)
			action |= KAUTH_VNODE_READ_DATA;
		if (fmode & (FWRITE | O_TRUNC))
			action |= KAUTH_VNODE_WRITE_DATA;
		if ((error = vnode_authorize(vp, NULL, action, ctx)) != 0)
			goto bad;
		
	}

	if ( (error = VNOP_OPEN(vp, fmode, ctx)) ) {
		goto bad;
	}
	if ( (error = vnode_ref_ext(vp, fmode)) )
		goto bad;

	/* call out to allow 3rd party notification of open. 
	 * Ignore result of kauth_authorize_fileop call.
	 */
	kauth_authorize_fileop(vfs_context_ucred(ctx), KAUTH_FILEOP_OPEN, 
						   (uintptr_t)vp, 0);

	*fmodep = fmode;
	return (0);
bad:
	ndp->ni_vp = NULL;
	if (vp) {
	        vnode_put(vp);
		/*
		 * Check for a race against unlink.  We had a vnode
		 * but according to vnode_authorize or VNOP_OPEN it
		 * no longer exists.
		 */
		if ((error == ENOENT) && (*fmodep & O_CREAT)) {
			goto again;
		}
	}
out:
	return (error);
}

/*
 * Authorize an action against a vnode.  This has been the canonical way to
 * ensure that the credential/process/etc. referenced by a vfs_context
 * is granted the rights called out in 'mode' against the vnode 'vp'.
 *
 * Unfortunately, the use of VREAD/VWRITE/VEXEC makes it very difficult
 * to add support for more rights.  As such, this interface will be deprecated
 * and callers will use vnode_authorize instead.
 */
#warning vn_access is deprecated
int
vn_access(vnode_t vp, int mode, vfs_context_t context)
{
 	kauth_action_t	action;
  
  	action = 0;
 	if (mode & VREAD)
 		action |= KAUTH_VNODE_READ_DATA;
 	if (mode & VWRITE)
		action |= KAUTH_VNODE_WRITE_DATA;
  	if (mode & VEXEC)
  		action |= KAUTH_VNODE_EXECUTE;
  
 	return(vnode_authorize(vp, NULL, action, context));
}

/*
 * Vnode close call
 */
int
vn_close(struct vnode *vp, int flags, kauth_cred_t cred, struct proc *p)
{
	struct vfs_context context;
	int error;

	context.vc_proc = p;
	context.vc_ucred = cred;

	if (flags & FWASWRITTEN) {
	        if (need_fsevent(FSE_CONTENT_MODIFIED, vp)) {
		        add_fsevent(FSE_CONTENT_MODIFIED, &context,
				    FSE_ARG_VNODE, vp,
				    FSE_ARG_DONE);
		}
	}

	error = VNOP_CLOSE(vp, flags, &context);
	(void)vnode_rele_ext(vp, flags, 0);

	return (error);
}

static int
vn_read_swapfile(
	struct vnode	*vp,
	uio_t		uio)
{
	static char *swap_read_zero_page = NULL;
	int	error;
	off_t	swap_count, this_count;
	off_t	file_end, read_end;
	off_t	prev_resid;

	/*
	 * Reading from a swap file will get you all zeroes.
	 */
	error = 0;
	swap_count = uio_resid(uio);

	file_end = ubc_getsize(vp);
	read_end = uio->uio_offset + uio_resid(uio);
	if (uio->uio_offset >= file_end) {
		/* uio starts after end of file: nothing to read */
		swap_count = 0;
	} else if (read_end > file_end) {
		/* uio extends beyond end of file: stop before that */
		swap_count -= (read_end - file_end);
	}

	while (swap_count > 0) {
		if (swap_read_zero_page == NULL) {
			char *my_zero_page;
			int funnel_state;

			/*
			 * Take kernel funnel so that only one thread
			 * sets up "swap_read_zero_page".
			 */
			funnel_state = thread_funnel_set(kernel_flock, TRUE);

			if (swap_read_zero_page == NULL) {
				MALLOC(my_zero_page, char *, PAGE_SIZE,
				       M_TEMP, M_WAITOK);
				memset(my_zero_page, '?', PAGE_SIZE);
				/*
				 * Adding a newline character here
				 * and there prevents "less(1)", for
				 * example, from getting too confused
				 * about a file with one really really
				 * long line.
				 */
				my_zero_page[PAGE_SIZE-1] = '\n';
				if (swap_read_zero_page == NULL) {
					swap_read_zero_page = my_zero_page;
				} else {
					FREE(my_zero_page, M_TEMP);
				}
			} else {
				/*
				 * Someone else raced us here and won;
				 * just use their page.
				 */
			}
			thread_funnel_set(kernel_flock, funnel_state);
		}

		this_count = swap_count;
		if (this_count > PAGE_SIZE) {
			this_count = PAGE_SIZE;
		}

		prev_resid = uio_resid(uio);
		error = uiomove((caddr_t) swap_read_zero_page,
				this_count,
				uio);
		if (error) {
			break;
		}
		swap_count -= (prev_resid - uio_resid(uio));
	}

	return error;
}
/*
 * Package up an I/O request on a vnode into a uio and do it.
 */
int
vn_rdwr(
	enum uio_rw rw,
	struct vnode *vp,
	caddr_t base,
	int len,
	off_t offset,
	enum uio_seg segflg,
	int ioflg,
	kauth_cred_t cred,
	int *aresid,
	struct proc *p)
{
	return vn_rdwr_64(rw,
			vp,
			(uint64_t)(uintptr_t)base,
			(int64_t)len,
			offset,
			segflg,
			ioflg,
			cred,
			aresid,
			p);
}


int
vn_rdwr_64(
	enum uio_rw rw,
	struct vnode *vp,
	uint64_t base,
	int64_t len,
	off_t offset,
	enum uio_seg segflg,
	int ioflg,
	kauth_cred_t cred,
	int *aresid,
	struct proc *p)
{
	uio_t auio;
	int spacetype;
	struct vfs_context context;
	int error=0;
	char uio_buf[ UIO_SIZEOF(1) ];

	context.vc_proc = p;
	context.vc_ucred = cred;

	if (UIO_SEG_IS_USER_SPACE(segflg)) {
		spacetype = proc_is64bit(p) ? UIO_USERSPACE64 : UIO_USERSPACE32;
	}
	else {
		spacetype = UIO_SYSSPACE;
	}
	auio = uio_createwithbuffer(1, offset, spacetype, rw, 
								  &uio_buf[0], sizeof(uio_buf));
	uio_addiov(auio, base, len);

	if (rw == UIO_READ) {
		if (vp->v_flag & VSWAP) {
			error = vn_read_swapfile(vp, auio);
		} else {
			error = VNOP_READ(vp, auio, ioflg, &context);
		}
	} else {
		error = VNOP_WRITE(vp, auio, ioflg, &context);
	}

	if (aresid)
		// LP64todo - fix this
		*aresid = uio_resid(auio);
	else
		if (uio_resid(auio) && error == 0)
			error = EIO;
	return (error);
}

/*
 * File table vnode read routine.
 */
static int
vn_read(struct fileproc *fp, struct uio *uio, kauth_cred_t cred,
	int flags, struct proc *p)
{
	struct vnode *vp;
	int error, ioflag;
	off_t count;
	struct vfs_context context;

	context.vc_proc = p;
	context.vc_ucred = cred;

	vp = (struct vnode *)fp->f_fglob->fg_data;
	if ( (error = vnode_getwithref(vp)) ) {
		return(error);
	}
	ioflag = 0;
	if (fp->f_fglob->fg_flag & FNONBLOCK)
		ioflag |= IO_NDELAY;

	if ((flags & FOF_OFFSET) == 0)
		uio->uio_offset = fp->f_fglob->fg_offset;
	count = uio_resid(uio);

	if (vp->v_flag & VSWAP) {
		/* special case for swap files */
		error = vn_read_swapfile(vp, uio);
	} else {
		error = VNOP_READ(vp, uio, ioflag, &context);
	}
	if ((flags & FOF_OFFSET) == 0)
		fp->f_fglob->fg_offset += count - uio_resid(uio);

	(void)vnode_put(vp);
	return (error);
}


/*
 * File table vnode write routine.
 */
static int
vn_write(struct fileproc *fp, struct uio *uio, kauth_cred_t cred,
	int flags, struct proc *p)
{
	struct vnode *vp;
	int error, ioflag;
	off_t count;
	struct vfs_context context;

	context.vc_proc = p;
	context.vc_ucred = cred;
	count = 0;
	vp = (struct vnode *)fp->f_fglob->fg_data;
	if ( (error = vnode_getwithref(vp)) ) {
		return(error);
	}
	ioflag = IO_UNIT;
	if (vp->v_type == VREG && (fp->f_fglob->fg_flag & O_APPEND))
		ioflag |= IO_APPEND;
	if (fp->f_fglob->fg_flag & FNONBLOCK)
		ioflag |= IO_NDELAY;
	if ((fp->f_fglob->fg_flag & O_FSYNC) ||
		(vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)))
		ioflag |= IO_SYNC;

	if ((flags & FOF_OFFSET) == 0) {
		uio->uio_offset = fp->f_fglob->fg_offset;
		count = uio_resid(uio);
	}
	if (p && (vp->v_type == VREG) &&
            (((uio->uio_offset + uio_uio_resid(uio)) > p->p_rlimit[RLIMIT_FSIZE].rlim_cur) ||
             (uio_uio_resid(uio) > (p->p_rlimit[RLIMIT_FSIZE].rlim_cur - uio->uio_offset)))) {
		psignal(p, SIGXFSZ);
		vnode_put(vp);
		return (EFBIG);
	}

	error = VNOP_WRITE(vp, uio, ioflag, &context);

	if ((flags & FOF_OFFSET) == 0) {
		if (ioflag & IO_APPEND)
			fp->f_fglob->fg_offset = uio->uio_offset;
		else
			fp->f_fglob->fg_offset += count - uio_resid(uio);
	}

	/*
	 * Set the credentials on successful writes
	 */
	if ((error == 0) && (vp->v_tag == VT_NFS) && (UBCINFOEXISTS(vp))) {
		/* 
		 * When called from aio subsystem, we only have the proc from
		 * which to get the credential, at this point, so use that
		 * instead.  This means aio functions are incompatible with
		 * per-thread credentials (aio operations are proxied).  We
		 * can't easily correct the aio vs. settid race in this case
		 * anyway, so we disallow it.
		 */
		if ((flags & FOF_PCRED) == 0) {
			ubc_setthreadcred(vp, p, current_thread());
		} else {
			ubc_setcred(vp, p);
		}
	}
	(void)vnode_put(vp);
	return (error);
}

/*
 * File table vnode stat routine.
 */
int
vn_stat_noauth(struct vnode *vp, struct stat *sb, kauth_filesec_t *xsec, vfs_context_t ctx)
{
	struct vnode_attr va;
	int error;
	u_short mode;
	kauth_filesec_t fsec;

	VATTR_INIT(&va);
	VATTR_WANTED(&va, va_fsid);
	VATTR_WANTED(&va, va_fileid);
	VATTR_WANTED(&va, va_mode);
	VATTR_WANTED(&va, va_type);
	VATTR_WANTED(&va, va_nlink);
	VATTR_WANTED(&va, va_uid);
	VATTR_WANTED(&va, va_gid);
	VATTR_WANTED(&va, va_rdev);
	VATTR_WANTED(&va, va_data_size);
	VATTR_WANTED(&va, va_access_time);
	VATTR_WANTED(&va, va_modify_time);
	VATTR_WANTED(&va, va_change_time);
	VATTR_WANTED(&va, va_flags);
	VATTR_WANTED(&va, va_gen);
	VATTR_WANTED(&va, va_iosize);
	/* lower layers will synthesise va_total_alloc from va_data_size if required */
	VATTR_WANTED(&va, va_total_alloc);
	if (xsec != NULL) {
		VATTR_WANTED(&va, va_uuuid);
		VATTR_WANTED(&va, va_guuid);
		VATTR_WANTED(&va, va_acl);
	}
	error = vnode_getattr(vp, &va, ctx);
	if (error)
		goto out;
	/*
	 * Copy from vattr table
	 */
	sb->st_dev = va.va_fsid;
	sb->st_ino = (ino_t)va.va_fileid;
	mode = va.va_mode;
	switch (vp->v_type) {
	case VREG:
		mode |= S_IFREG;
		break;
	case VDIR:
		mode |= S_IFDIR;
		break;
	case VBLK:
		mode |= S_IFBLK;
		break;
	case VCHR:
		mode |= S_IFCHR;
		break;
	case VLNK:
		mode |= S_IFLNK;
		break;
	case VSOCK:
		mode |= S_IFSOCK;
		break;
	case VFIFO:
		mode |= S_IFIFO;
		break;
	default:
		error = EBADF;
		goto out;
	};
	sb->st_mode = mode;
	sb->st_nlink = VATTR_IS_SUPPORTED(&va, va_nlink) ? (u_int16_t)va.va_nlink : 1;
	sb->st_uid = va.va_uid;
	sb->st_gid = va.va_gid;
	sb->st_rdev = va.va_rdev;
	sb->st_size = va.va_data_size;
	sb->st_atimespec = va.va_access_time;
	sb->st_mtimespec = va.va_modify_time;
	sb->st_ctimespec = va.va_change_time;
	sb->st_blksize = va.va_iosize;
	sb->st_flags = va.va_flags;
	sb->st_blocks = roundup(va.va_total_alloc, 512) / 512;

	/* if we're interested in exended security data and we got an ACL */
	if (xsec != NULL) {
		if (!VATTR_IS_SUPPORTED(&va, va_acl) &&
		    !VATTR_IS_SUPPORTED(&va, va_uuuid) &&
		    !VATTR_IS_SUPPORTED(&va, va_guuid)) {
			*xsec = KAUTH_FILESEC_NONE;
		} else {
		
			if (VATTR_IS_SUPPORTED(&va, va_acl) && (va.va_acl != NULL)) {
				fsec = kauth_filesec_alloc(va.va_acl->acl_entrycount);
			} else {
				fsec = kauth_filesec_alloc(0);
			}
			if (fsec == NULL) {
				error = ENOMEM;
				goto out;
			}
			fsec->fsec_magic = KAUTH_FILESEC_MAGIC;
			if (VATTR_IS_SUPPORTED(&va, va_uuuid)) {
				fsec->fsec_owner = va.va_uuuid;
			} else {
				fsec->fsec_owner = kauth_null_guid;
			}
			if (VATTR_IS_SUPPORTED(&va, va_guuid)) {
				fsec->fsec_group = va.va_guuid;
			} else {
				fsec->fsec_group = kauth_null_guid;
			}
			if (VATTR_IS_SUPPORTED(&va, va_acl) && (va.va_acl != NULL)) {
				bcopy(va.va_acl, &(fsec->fsec_acl), KAUTH_ACL_COPYSIZE(va.va_acl));
			} else {
				fsec->fsec_acl.acl_entrycount = KAUTH_FILESEC_NOACL;
			}
			*xsec = fsec;
		}
	}
	
	/* Do not give the generation number out to unpriviledged users */
	if (va.va_gen && !vfs_context_issuser(ctx))
		sb->st_gen = 0; 
	else
		sb->st_gen = va.va_gen;

	error = 0;
out:
	if (VATTR_IS_SUPPORTED(&va, va_acl) && va.va_acl != NULL)
		kauth_acl_free(va.va_acl);
	return (error);
}

int
vn_stat(struct vnode *vp, struct stat *sb, kauth_filesec_t *xsec, vfs_context_t ctx)
{
	int error;

	/* authorize */
	if ((error = vnode_authorize(vp, NULL, KAUTH_VNODE_READ_ATTRIBUTES | KAUTH_VNODE_READ_SECURITY, ctx)) != 0)
		return(error);

	/* actual stat */
	return(vn_stat_noauth(vp, sb, xsec, ctx));
}


/*
 * File table vnode ioctl routine.
 */
static int
vn_ioctl(fp, com, data, p)
	struct fileproc *fp;
	u_long com;
	caddr_t data;
	struct proc *p;
{
	register struct vnode *vp = ((struct vnode *)fp->f_fglob->fg_data);
	struct vfs_context context;
	off_t file_size;
	int error;
	struct vnode *ttyvp;
	int funnel_state;
	
	if ( (error = vnode_getwithref(vp)) ) {
		return(error);
	}
	context.vc_proc = p;
	context.vc_ucred = kauth_cred_proc_ref(p);	/* XXX kauth_cred_get() ??? */

	switch (vp->v_type) {

	case VREG:
	case VDIR:
		if (com == FIONREAD) {
			if ((error = vnode_size(vp, &file_size, &context)) != 0)
				goto out;
			*(int *)data = file_size - fp->f_fglob->fg_offset;
			goto out;
		}
		if (com == FIONBIO || com == FIOASYNC) {	/* XXX */
			goto out;
		}
		/* fall into ... */

	default:
		error = ENOTTY;
		goto out;

	case VFIFO:
	case VCHR:
	case VBLK:

		/* Should not be able to set block size from user space */
		if (com == DKIOCSETBLOCKSIZE) {
			error = EPERM;
			goto out;
		}

		if (com == FIODTYPE) {
			if (vp->v_type == VBLK) {
				if (major(vp->v_rdev) >= nblkdev) {
					error = ENXIO;
					goto out;
				}
				*(int *)data = bdevsw[major(vp->v_rdev)].d_type;

			} else if (vp->v_type == VCHR) {
				if (major(vp->v_rdev) >= nchrdev) {
					error = ENXIO;
					goto out;
				}
				*(int *)data = cdevsw[major(vp->v_rdev)].d_type;
			} else {
				error = ENOTTY;
				goto out;
			}
			goto out;
		}
		error = VNOP_IOCTL(vp, com, data, fp->f_fglob->fg_flag, &context);

		if (error == 0 && com == TIOCSCTTY) {
			vnode_ref(vp);

			funnel_state = thread_funnel_set(kernel_flock, TRUE);
			ttyvp = p->p_session->s_ttyvp;
			p->p_session->s_ttyvp = vp;
			thread_funnel_set(kernel_flock, funnel_state);

			if (ttyvp)
				vnode_rele(ttyvp);
		}
	}
out:
	(void)vnode_put(vp);
	kauth_cred_unref(&context.vc_ucred);
	return(error);
}

/*
 * File table vnode select routine.
 */
static int
vn_select(fp, which, wql, p)
	struct fileproc *fp;
	int which;
	void * wql;
	struct proc *p;
{
	int error;
	struct vnode * vp = (struct vnode *)fp->f_fglob->fg_data;
	struct vfs_context context;

	if ( (error = vnode_getwithref(vp)) == 0 ) {
	        context.vc_proc = p;
		context.vc_ucred = fp->f_fglob->fg_cred;

	        error = VNOP_SELECT(vp, which, fp->f_fglob->fg_flag, wql, &context);

		(void)vnode_put(vp);
	}
	return(error);
	
}

/*
 * Check that the vnode is still valid, and if so
 * acquire requested lock.
 */
int
vn_lock(__unused vnode_t vp, __unused int flags, __unused proc_t p)
{
	return (0);
}

/*
 * File table vnode close routine.
 */
static int
vn_closefile(fg, p)
	struct fileglob *fg;
	struct proc *p;
{
	struct vnode *vp = (struct vnode *)fg->fg_data;
	int error;

	if ( (error = vnode_getwithref(vp)) == 0 ) {
	        error = vn_close(vp, fg->fg_flag, fg->fg_cred, p);

		(void)vnode_put(vp);
	}
	return(error);
}

int
vn_pathconf(vnode_t vp, int name, register_t *retval, vfs_context_t ctx)
{
	int	error = 0;

	switch(name) {
	case _PC_EXTENDED_SECURITY_NP:
		*retval = vfs_extendedsecurity(vnode_mount(vp));
		break;
	case _PC_AUTH_OPAQUE_NP:
		*retval = vfs_authopaque(vnode_mount(vp));
		break;
	default:
		error = VNOP_PATHCONF(vp, name, retval, ctx);
		break;
	}

	return (error);
}

static int
vn_kqfilt_add(fp, kn, p)
	struct fileproc *fp;
	struct knote *kn;
	struct proc *p;
{
	struct vnode *vp = (struct vnode *)fp->f_fglob->fg_data;
	struct vfs_context context;
	int error;
	int funnel_state;
	
	if ( (error = vnode_getwithref(vp)) == 0 ) {
		context.vc_proc = p;
		context.vc_ucred = kauth_cred_proc_ref(p);	/* XXX kauth_cred_get() ??? */

	        funnel_state = thread_funnel_set(kernel_flock, TRUE);
		error = VNOP_KQFILT_ADD(vp, kn, &context);
		thread_funnel_set(kernel_flock, funnel_state);

		(void)vnode_put(vp);
		kauth_cred_unref(&context.vc_ucred);
	}
	return (error);
}

#if 0
/* No one calls this yet. */
static int
vn_kqfilt_remove(vp, ident, p)
	struct vnode *vp;
	uintptr_t ident;
	struct proc *p;
{
	struct vfs_context context;
	int error;
	int funnel_state;
	
	if ( (error = vnode_getwithref(vp)) == 0 ) {
	        context.vc_proc = p;
		context.vc_ucred = kauth_cred_proc_ref(p);	/* XXX kauth_cred_get() ??? */

		funnel_state = thread_funnel_set(kernel_flock, TRUE);
		error = VNOP_KQFILT_REMOVE(vp, ident, &context);
		thread_funnel_set(kernel_flock, funnel_state);

		(void)vnode_put(vp);
		kauth_cred_unref(&context.vc_ucred);
	}
	return (error);
}
#endif