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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 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
 *
 *	History
 *	10-20-1997	Umesh Vaishampayan
 *		Fixed the count to be off_t rather than int.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/ubc.h>
#include <mach/kern_return.h>
#include <mach/memory_object_control.h>
#include <mach/vm_prot.h>

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

/*
 * Common code for vnode open operations.
 * Check permissions, and call the VOP_OPEN or VOP_CREATE routine.
 */
vn_open(ndp, fmode, cmode)
	register struct nameidata *ndp;
	int fmode, cmode;
{
	register struct vnode *vp;
	register struct proc *p = ndp->ni_cnd.cn_proc;
	register struct ucred *cred = p->p_ucred;
	struct vattr vat;
	struct vattr *vap = &vat;
	int error;

	if (fmode & O_CREAT) {
		ndp->ni_cnd.cn_nameiop = CREATE;
		ndp->ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF;
		if ((fmode & O_EXCL) == 0)
			ndp->ni_cnd.cn_flags |= FOLLOW;
		if (error = namei(ndp))
			return (error);
		if (ndp->ni_vp == NULL) {
			VATTR_NULL(vap);
			vap->va_type = VREG;
			vap->va_mode = cmode;
			if (fmode & O_EXCL)
				vap->va_vaflags |= VA_EXCLUSIVE;
			VOP_LEASE(ndp->ni_dvp, p, cred, LEASE_WRITE);
			if (error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
			    &ndp->ni_cnd, vap))
				return (error);
			fmode &= ~O_TRUNC;
			vp = ndp->ni_vp;
		} else {
			VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd);
			if (ndp->ni_dvp == ndp->ni_vp)
				vrele(ndp->ni_dvp);
			else
				vput(ndp->ni_dvp);
			ndp->ni_dvp = NULL;
			vp = ndp->ni_vp;
			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;
		if (error = namei(ndp))
			return (error);
		vp = ndp->ni_vp;
	}
	if (vp->v_type == VSOCK) {
		error = EOPNOTSUPP;
		goto bad;
	}
	if ((fmode & O_CREAT) == 0) {
		if (fmode & FREAD && fmode & (FWRITE | O_TRUNC)) {
			int err = 0;
			if (vp->v_type == VDIR)
				err = EISDIR;
			else
				err = vn_writechk(vp);
			if (err && !(error = VOP_ACCESS(vp, VREAD, cred, p)))
				error = err;
			if (error || (error = VOP_ACCESS(vp, VREAD|VWRITE,
							 cred, p)))
				goto bad;
		} else if (fmode & FREAD) {
			if ((error = VOP_ACCESS(vp, VREAD, cred, p)))
				goto bad;
		} else if (fmode & (FWRITE | O_TRUNC)) {
			if (vp->v_type == VDIR) {
				error = EISDIR;
				goto bad;
			}
			if ((error = vn_writechk(vp)) ||
			    (error = VOP_ACCESS(vp, VWRITE, cred, p)))
				goto bad;
		}
	}
	if (fmode & O_TRUNC) {
		VOP_UNLOCK(vp, 0, p);				/* XXX */
		VOP_LEASE(vp, p, cred, LEASE_WRITE);
		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);	/* XXX */
		VATTR_NULL(vap);
		vap->va_size = 0;
		if (error = VOP_SETATTR(vp, vap, cred, p))
			goto bad;
	}
	if (error = VOP_OPEN(vp, fmode, cred, p))
		goto bad;
	if (UBCINFOMISSING(vp))
			panic("vn_open: ubc_info_init");
	if (UBCINFOEXISTS(vp) && !ubc_hold(vp))
		panic("vn_open: hold");
	if (fmode & FWRITE)
		if (++vp->v_writecount <= 0)
			panic("vn_open: v_writecount");
	return (0);
bad:
	vput(vp);
	return (error);
}

/*
 * Check for write permissions on the specified vnode.
 * Prototype text segments cannot be written.
 */
vn_writechk(vp)
	register struct vnode *vp;
{

	/*
	 * If there's shared text associated with
	 * the vnode, try to free it up once.  If
	 * we fail, we can't allow writing.
	 */
#if 0
	/* XXXXX Not sure we need this */
	if (vp->v_flag & VTEXT)
		return (ETXTBSY);
#endif /* 0 */
	return (0);
}

/*
 * Vnode close call
 */
vn_close(vp, flags, cred, p)
	register struct vnode *vp;
	int flags;
	struct ucred *cred;
	struct proc *p;
{
	int error;
	vm_map_t user_map;
	vm_offset_t addr, addr1;
	vm_size_t size, pageoff;

	if (flags & FWRITE)
		vp->v_writecount--;
	error = VOP_CLOSE(vp, flags, cred, p);
	ubc_rele(vp);
	vrele(vp);
	return (error);
}

/*
 * Package up an I/O request on a vnode into a uio and do it.
 */
vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, p)
	enum uio_rw rw;
	struct vnode *vp;
	caddr_t base;
	int len;
	off_t offset;
	enum uio_seg segflg;
	int ioflg;
	struct ucred *cred;
	int *aresid;
	struct proc *p;
{
	struct uio auio;
	struct iovec aiov;
	int error=0;

	 /* FIXME XXX */
	if ((ioflg & IO_NODELOCKED) == 0)
			vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
	auio.uio_iov = &aiov;
	auio.uio_iovcnt = 1;
	aiov.iov_base = base;
	aiov.iov_len = len;
	auio.uio_resid = len;
	auio.uio_offset = offset;
	auio.uio_segflg = segflg;
	auio.uio_rw = rw;
	auio.uio_procp = p;

	if (rw == UIO_READ)
		error = VOP_READ(vp, &auio, ioflg, cred);
	 else 
		error = VOP_WRITE(vp, &auio, ioflg, cred);

	if (aresid)
		*aresid = auio.uio_resid;
	else
		if (auio.uio_resid && error == 0)
			error = EIO;
	if ((ioflg & IO_NODELOCKED) == 0)
		VOP_UNLOCK(vp, 0, p);
	return (error);
}

/*
 * File table vnode read routine.
 */
vn_read(fp, uio, cred)
	struct file *fp;
	struct uio *uio;
	struct ucred *cred;
{
	struct vnode *vp = (struct vnode *)fp->f_data;
	struct proc *p = uio->uio_procp;
	int error;
	off_t count;

	VOP_LEASE(vp, p, cred, LEASE_READ);
	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
	uio->uio_offset = fp->f_offset;
	count = uio->uio_resid;

	error = VOP_READ(vp, uio, (fp->f_flag & FNONBLOCK) ? IO_NDELAY : 0, cred);

	fp->f_offset += count - uio->uio_resid;
	VOP_UNLOCK(vp, 0, p);
	return (error);
}


/*
 * File table vnode write routine.
 */
vn_write(fp, uio, cred)
	struct file *fp;
	struct uio *uio;
	struct ucred *cred;
{
	struct vnode *vp = (struct vnode *)fp->f_data;
	struct proc *p = uio->uio_procp;
	int error, ioflag = IO_UNIT;
	off_t count;

	if (vp->v_type == VREG && (fp->f_flag & O_APPEND))
		ioflag |= IO_APPEND;
	if (fp->f_flag & FNONBLOCK)
		ioflag |= IO_NDELAY;
	if ((fp->f_flag & O_FSYNC) ||
		(vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)))
		ioflag |= IO_SYNC;
	VOP_LEASE(vp, p, cred, LEASE_WRITE);
	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
	uio->uio_offset = fp->f_offset;
	count = uio->uio_resid;

	error = VOP_WRITE(vp, uio, ioflag, cred);

	if (ioflag & IO_APPEND)
		fp->f_offset = uio->uio_offset;
	else
		fp->f_offset += count - uio->uio_resid;
	/*
	 * Set the credentials on successful writes
	 */
	if ((error == 0) && (vp->v_tag == VT_NFS) && (UBCINFOEXISTS(vp))) {
		ubc_setcred(vp, p);
	}

	VOP_UNLOCK(vp, 0, p);
	return (error);
}

/*
 * File table vnode stat routine.
 */
vn_stat(vp, sb, p)
	struct vnode *vp;
	register struct stat *sb;
	struct proc *p;
{
	struct vattr vattr;
	register struct vattr *vap;
	int error;
	u_short mode;

	vap = &vattr;
	error = VOP_GETATTR(vp, vap, p->p_ucred, p);
	if (error)
		return (error);
	/*
	 * Copy from vattr table
	 */
	sb->st_dev = vap->va_fsid;
	sb->st_ino = vap->va_fileid;
	mode = vap->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:
		return (EBADF);
	};
	sb->st_mode = mode;
	sb->st_nlink = vap->va_nlink;
	sb->st_uid = vap->va_uid;
	sb->st_gid = vap->va_gid;
	sb->st_rdev = vap->va_rdev;
	sb->st_size = vap->va_size;
	sb->st_atimespec = vap->va_atime;
	sb->st_mtimespec = vap->va_mtime;
	sb->st_ctimespec = vap->va_ctime;
	sb->st_blksize = vap->va_blocksize;
	sb->st_flags = vap->va_flags;
	/* Do not give the generation number out to unpriviledged users */
	if (suser(p->p_ucred, &p->p_acflag))
		sb->st_gen = 0; 
	else
		sb->st_gen = vap->va_gen;
	sb->st_blocks = vap->va_bytes / S_BLKSIZE;
	return (0);
}

/*
 * File table vnode ioctl routine.
 */
vn_ioctl(fp, com, data, p)
	struct file *fp;
	u_long com;
	caddr_t data;
	struct proc *p;
{
	register struct vnode *vp = ((struct vnode *)fp->f_data);
	struct vattr vattr;
	int error;

	switch (vp->v_type) {

	case VREG:
	case VDIR:
		if (com == FIONREAD) {
			if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p))
				return (error);
			*(int *)data = vattr.va_size - fp->f_offset;
			return (0);
		}
		if (com == FIONBIO || com == FIOASYNC)	/* XXX */
			return (0);			/* XXX */
		/* fall into ... */

	default:
		return (ENOTTY);

	case VFIFO:
	case VCHR:
	case VBLK:
		error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p);
		if (error == 0 && com == TIOCSCTTY) {
			if (p->p_session->s_ttyvp)
				vrele(p->p_session->s_ttyvp);
			p->p_session->s_ttyvp = vp;
			VREF(vp);
		}
		return (error);
	}
}

/*
 * File table vnode select routine.
 */
vn_select(fp, which, p)
	struct file *fp;
	int which;
	struct proc *p;
{

	return (VOP_SELECT(((struct vnode *)fp->f_data), which, fp->f_flag,
		fp->f_cred, p));
}

/*
 * Check that the vnode is still valid, and if so
 * acquire requested lock.
 */
int
vn_lock(vp, flags, p)
	struct vnode *vp;
	int flags;
	struct proc *p;
{
	int error;
	
	do {
		if ((flags & LK_INTERLOCK) == 0)
			simple_lock(&vp->v_interlock);
		if (vp->v_flag & VXLOCK) {
			while (vp->v_flag & VXLOCK) {
				vp->v_flag |= VXWANT;
				simple_unlock(&vp->v_interlock);
				tsleep((caddr_t)vp, PINOD, "vn_lock", 0);
			}
			error = ENOENT;
		} else {
			error = VOP_LOCK(vp, flags | LK_INTERLOCK, p);
			if (error == 0)
				return (error);
		}
		flags &= ~LK_INTERLOCK;
	} while (flags & LK_RETRY);
	return (error);
}

/*
 * File table vnode close routine.
 */
vn_closefile(fp, p)
	struct file *fp;
	struct proc *p;
{

	return (vn_close(((struct vnode *)fp->f_data), fp->f_flag,
		fp->f_cred, p));
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	23	/*
	24	* Copyright (c) 1982, 1986, 1989, 1993
	25	* The Regents of the University of California. All rights reserved.
	26	* (c) UNIX System Laboratories, Inc.
	27	* All or some portions of this file are derived from material licensed
	28	* to the University of California by American Telephone and Telegraph
	29	* Co. or Unix System Laboratories, Inc. and are reproduced herein with
	30	* the permission of UNIX System Laboratories, Inc.
	31	*
	32	* Redistribution and use in source and binary forms, with or without
	33	* modification, are permitted provided that the following conditions
	34	* are 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
	38	* notice, this list of conditions and the following disclaimer in the
	39	* documentation and/or other materials provided with the distribution.
	40	* 3. All advertising materials mentioning features or use of this software
	41	* must display the following acknowledgement:
	42	* This product includes software developed by the University of
	43	* California, Berkeley and its contributors.
	44	* 4. Neither the name of the University nor the names of its contributors
	45	* may be used to endorse or promote products derived from this software
	46	* without specific prior written permission.
	47	*
	48	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	49	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	50	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	51	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	52	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	53	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	54	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	55	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	56	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	57	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	58	* SUCH DAMAGE.
	59	*
	60	* @(#)vfs_vnops.c 8.14 (Berkeley) 6/15/95
	61	*
	62	* History
	63	* 10-20-1997 Umesh Vaishampayan
	64	* Fixed the count to be off_t rather than int.
65	*/
66
67	#include <sys/param.h>
68	#include <sys/systm.h>
69	#include <sys/kernel.h>
70	#include <sys/file.h>
71	#include <sys/stat.h>
72	#include <sys/buf.h>
73	#include <sys/proc.h>
74	#include <sys/mount.h>
75	#include <sys/namei.h>
76	#include <sys/vnode.h>
77	#include <sys/ioctl.h>
78	#include <sys/tty.h>
79	#include <sys/ubc.h>
80	#include <mach/kern_return.h>
81	#include <mach/memory_object_control.h>
82	#include <mach/vm_prot.h>
83
84	struct fileops vnops =
85	{ vn_read, vn_write, vn_ioctl, vn_select, vn_closefile };
86
87	/*
88	* Common code for vnode open operations.
89	* Check permissions, and call the VOP_OPEN or VOP_CREATE routine.
90	*/
91	vn_open(ndp, fmode, cmode)
92	register struct nameidata *ndp;
93	int fmode, cmode;
94	{
95	register struct vnode *vp;
96	register struct proc *p = ndp->ni_cnd.cn_proc;
97	register struct ucred *cred = p->p_ucred;
98	struct vattr vat;
99	struct vattr *vap = &vat;
100	int error;
101
102	if (fmode & O_CREAT) {
103	ndp->ni_cnd.cn_nameiop = CREATE;
104	ndp->ni_cnd.cn_flags = LOCKPARENT \| LOCKLEAF;
105	if ((fmode & O_EXCL) == 0)
106	ndp->ni_cnd.cn_flags \|= FOLLOW;
107	if (error = namei(ndp))
108	return (error);
109	if (ndp->ni_vp == NULL) {
110	VATTR_NULL(vap);
111	vap->va_type = VREG;
112	vap->va_mode = cmode;
113	if (fmode & O_EXCL)
114	vap->va_vaflags \|= VA_EXCLUSIVE;
115	VOP_LEASE(ndp->ni_dvp, p, cred, LEASE_WRITE);
116	if (error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
117	&ndp->ni_cnd, vap))
118	return (error);
119	fmode &= ~O_TRUNC;
120	vp = ndp->ni_vp;
121	} else {
122	VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd);
123	if (ndp->ni_dvp == ndp->ni_vp)
124	vrele(ndp->ni_dvp);
125	else
126	vput(ndp->ni_dvp);
127	ndp->ni_dvp = NULL;
128	vp = ndp->ni_vp;
129	if (fmode & O_EXCL) {
130	error = EEXIST;
131	goto bad;
132	}
133	fmode &= ~O_CREAT;
134	}
135	} else {
136	ndp->ni_cnd.cn_nameiop = LOOKUP;
137	ndp->ni_cnd.cn_flags = FOLLOW \| LOCKLEAF;
138	if (error = namei(ndp))
139	return (error);
140	vp = ndp->ni_vp;
141	}
142	if (vp->v_type == VSOCK) {
143	error = EOPNOTSUPP;
144	goto bad;
145	}
146	if ((fmode & O_CREAT) == 0) {
147	if (fmode & FREAD && fmode & (FWRITE \| O_TRUNC)) {
148	int err = 0;
149	if (vp->v_type == VDIR)
150	err = EISDIR;
151	else
152	err = vn_writechk(vp);
153	if (err && !(error = VOP_ACCESS(vp, VREAD, cred, p)))
154	error = err;
155	if (error \|\| (error = VOP_ACCESS(vp, VREAD\|VWRITE,
156	cred, p)))
157	goto bad;
158	} else if (fmode & FREAD) {
159	if ((error = VOP_ACCESS(vp, VREAD, cred, p)))
160	goto bad;
161	} else if (fmode & (FWRITE \| O_TRUNC)) {
162	if (vp->v_type == VDIR) {
163	error = EISDIR;
164	goto bad;
165	}
166	if ((error = vn_writechk(vp)) \|\|
167	(error = VOP_ACCESS(vp, VWRITE, cred, p)))
168	goto bad;
169	}
170	}
171	if (fmode & O_TRUNC) {
172	VOP_UNLOCK(vp, 0, p); /* XXX */
173	VOP_LEASE(vp, p, cred, LEASE_WRITE);
174	vn_lock(vp, LK_EXCLUSIVE \| LK_RETRY, p); /* XXX */
175	VATTR_NULL(vap);
176	vap->va_size = 0;
177	if (error = VOP_SETATTR(vp, vap, cred, p))
178	goto bad;
179	}
180	if (error = VOP_OPEN(vp, fmode, cred, p))
181	goto bad;
182	if (UBCINFOMISSING(vp))
183	panic("vn_open: ubc_info_init");
184	if (UBCINFOEXISTS(vp) && !ubc_hold(vp))
185	panic("vn_open: hold");
186	if (fmode & FWRITE)
187	if (++vp->v_writecount <= 0)
188	panic("vn_open: v_writecount");
189	return (0);
190	bad:
191	vput(vp);
192	return (error);
193	}
194
195	/*
196	* Check for write permissions on the specified vnode.
197	* Prototype text segments cannot be written.
198	*/
199	vn_writechk(vp)
200	register struct vnode *vp;
201	{
202
203	/*
204	* If there's shared text associated with
205	* the vnode, try to free it up once. If
206	* we fail, we can't allow writing.
207	*/
208	#if 0
209	/* XXXXX Not sure we need this */
210	if (vp->v_flag & VTEXT)
211	return (ETXTBSY);
212	#endif /* 0 */
213	return (0);
214	}
215
216	/*
217	* Vnode close call
218	*/
219	vn_close(vp, flags, cred, p)
220	register struct vnode *vp;
221	int flags;
222	struct ucred *cred;
223	struct proc *p;
224	{
225	int error;
226	vm_map_t user_map;
227	vm_offset_t addr, addr1;
228	vm_size_t size, pageoff;
229
230	if (flags & FWRITE)
231	vp->v_writecount--;
232	error = VOP_CLOSE(vp, flags, cred, p);
233	ubc_rele(vp);
234	vrele(vp);
235	return (error);
236	}
237
238	/*
239	* Package up an I/O request on a vnode into a uio and do it.
240	*/
241	vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, p)
242	enum uio_rw rw;
243	struct vnode *vp;
244	caddr_t base;
245	int len;
246	off_t offset;
247	enum uio_seg segflg;
248	int ioflg;
249	struct ucred *cred;
250	int *aresid;
251	struct proc *p;
252	{
253	struct uio auio;
254	struct iovec aiov;
255	int error=0;
256
257	/* FIXME XXX */
258	if ((ioflg & IO_NODELOCKED) == 0)
259	vn_lock(vp, LK_EXCLUSIVE \| LK_RETRY, p);
260	auio.uio_iov = &aiov;
261	auio.uio_iovcnt = 1;
262	aiov.iov_base = base;
263	aiov.iov_len = len;
264	auio.uio_resid = len;
265	auio.uio_offset = offset;
266	auio.uio_segflg = segflg;
267	auio.uio_rw = rw;
268	auio.uio_procp = p;
269
270	if (rw == UIO_READ)
271	error = VOP_READ(vp, &auio, ioflg, cred);
272	else
273	error = VOP_WRITE(vp, &auio, ioflg, cred);
274
275	if (aresid)
276	*aresid = auio.uio_resid;
277	else
278	if (auio.uio_resid && error == 0)
279	error = EIO;
280	if ((ioflg & IO_NODELOCKED) == 0)
281	VOP_UNLOCK(vp, 0, p);
282	return (error);
283	}
284
285	/*
286	* File table vnode read routine.
287	*/
288	vn_read(fp, uio, cred)
289	struct file *fp;
290	struct uio *uio;
291	struct ucred *cred;
292	{
293	struct vnode vp = (struct vnode )fp->f_data;
294	struct proc *p = uio->uio_procp;
295	int error;
296	off_t count;
297
298	VOP_LEASE(vp, p, cred, LEASE_READ);
299	vn_lock(vp, LK_EXCLUSIVE \| LK_RETRY, p);
300	uio->uio_offset = fp->f_offset;
301	count = uio->uio_resid;
302
303	error = VOP_READ(vp, uio, (fp->f_flag & FNONBLOCK) ? IO_NDELAY : 0, cred);
304
305	fp->f_offset += count - uio->uio_resid;
306	VOP_UNLOCK(vp, 0, p);
307	return (error);
308	}
309
310
311	/*
312	* File table vnode write routine.
313	*/
314	vn_write(fp, uio, cred)
315	struct file *fp;
316	struct uio *uio;
317	struct ucred *cred;
318	{
319	struct vnode vp = (struct vnode )fp->f_data;
320	struct proc *p = uio->uio_procp;
321	int error, ioflag = IO_UNIT;
322	off_t count;
323
324	if (vp->v_type == VREG && (fp->f_flag & O_APPEND))
325	ioflag \|= IO_APPEND;
326	if (fp->f_flag & FNONBLOCK)
327	ioflag \|= IO_NDELAY;
328	if ((fp->f_flag & O_FSYNC) \|\|
329	(vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)))
330	ioflag \|= IO_SYNC;
331	VOP_LEASE(vp, p, cred, LEASE_WRITE);
332	vn_lock(vp, LK_EXCLUSIVE \| LK_RETRY, p);
333	uio->uio_offset = fp->f_offset;
334	count = uio->uio_resid;
335
336	error = VOP_WRITE(vp, uio, ioflag, cred);
337
338	if (ioflag & IO_APPEND)
339	fp->f_offset = uio->uio_offset;
340	else
341	fp->f_offset += count - uio->uio_resid;
342	/*
343	* Set the credentials on successful writes
344	*/
345	if ((error == 0) && (vp->v_tag == VT_NFS) && (UBCINFOEXISTS(vp))) {
346	ubc_setcred(vp, p);
347	}
348
349	VOP_UNLOCK(vp, 0, p);
350	return (error);
351	}
352
353	/*
354	* File table vnode stat routine.
355	*/
356	vn_stat(vp, sb, p)
357	struct vnode *vp;
358	register struct stat *sb;
359	struct proc *p;
360	{
361	struct vattr vattr;
362	register struct vattr *vap;
363	int error;
364	u_short mode;
365
366	vap = &vattr;
367	error = VOP_GETATTR(vp, vap, p->p_ucred, p);
368	if (error)
369	return (error);
370	/*
371	* Copy from vattr table
372	*/
373	sb->st_dev = vap->va_fsid;
374	sb->st_ino = vap->va_fileid;
375	mode = vap->va_mode;
376	switch (vp->v_type) {
377	case VREG:
378	mode \|= S_IFREG;
379	break;
380	case VDIR:
381	mode \|= S_IFDIR;
382	break;
383	case VBLK:
384	mode \|= S_IFBLK;
385	break;
386	case VCHR:
387	mode \|= S_IFCHR;
388	break;
389	case VLNK:
390	mode \|= S_IFLNK;
391	break;
392	case VSOCK:
393	mode \|= S_IFSOCK;
394	break;
395	case VFIFO:
396	mode \|= S_IFIFO;
397	break;
398	default:
399	return (EBADF);
400	};
401	sb->st_mode = mode;
402	sb->st_nlink = vap->va_nlink;
403	sb->st_uid = vap->va_uid;
404	sb->st_gid = vap->va_gid;
405	sb->st_rdev = vap->va_rdev;
406	sb->st_size = vap->va_size;
407	sb->st_atimespec = vap->va_atime;
408	sb->st_mtimespec = vap->va_mtime;
409	sb->st_ctimespec = vap->va_ctime;
410	sb->st_blksize = vap->va_blocksize;
411	sb->st_flags = vap->va_flags;
412	/* Do not give the generation number out to unpriviledged users */
413	if (suser(p->p_ucred, &p->p_acflag))
414	sb->st_gen = 0;
415	else
416	sb->st_gen = vap->va_gen;
417	sb->st_blocks = vap->va_bytes / S_BLKSIZE;
418	return (0);
419	}
420
421	/*
422	* File table vnode ioctl routine.
423	*/
424	vn_ioctl(fp, com, data, p)
425	struct file *fp;
426	u_long com;
427	caddr_t data;
428	struct proc *p;
429	{
430	register struct vnode vp = ((struct vnode )fp->f_data);
431	struct vattr vattr;
432	int error;
433
434	switch (vp->v_type) {
435
436	case VREG:
437	case VDIR:
438	if (com == FIONREAD) {
439	if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p))
440	return (error);
441	(int )data = vattr.va_size - fp->f_offset;
442	return (0);
443	}
444	if (com == FIONBIO \|\| com == FIOASYNC) /* XXX */
445	return (0); /* XXX */
446	/* fall into ... */
447
448	default:
449	return (ENOTTY);
450
451	case VFIFO:
452	case VCHR:
453	case VBLK:
454	error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p);
455	if (error == 0 && com == TIOCSCTTY) {
456	if (p->p_session->s_ttyvp)
457	vrele(p->p_session->s_ttyvp);
458	p->p_session->s_ttyvp = vp;
459	VREF(vp);
460	}
461	return (error);
462	}
463	}
464
465	/*
466	* File table vnode select routine.
467	*/
468	vn_select(fp, which, p)
469	struct file *fp;
470	int which;
471	struct proc *p;
472	{
473
474	return (VOP_SELECT(((struct vnode *)fp->f_data), which, fp->f_flag,
475	fp->f_cred, p));
476	}
477
478	/*
479	* Check that the vnode is still valid, and if so
480	* acquire requested lock.
481	*/
482	int
483	vn_lock(vp, flags, p)
484	struct vnode *vp;
485	int flags;
486	struct proc *p;
487	{
488	int error;
489
490	do {
491	if ((flags & LK_INTERLOCK) == 0)
492	simple_lock(&vp->v_interlock);
493	if (vp->v_flag & VXLOCK) {
494	while (vp->v_flag & VXLOCK) {
495	vp->v_flag \|= VXWANT;
496	simple_unlock(&vp->v_interlock);
497	tsleep((caddr_t)vp, PINOD, "vn_lock", 0);
498	}
499	error = ENOENT;
500	} else {
501	error = VOP_LOCK(vp, flags \| LK_INTERLOCK, p);
502	if (error == 0)
503	return (error);
504	}
505	flags &= ~LK_INTERLOCK;
506	} while (flags & LK_RETRY);
507	return (error);
508	}
509
510	/*
511	* File table vnode close routine.
512	*/
513	vn_closefile(fp, p)
514	struct file *fp;
515	struct proc *p;
516	{
517
518	return (vn_close(((struct vnode *)fp->f_data), fp->f_flag,
519	fp->f_cred, p));
520	}