1 files changed, 422 insertions, 0 deletions

diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
new file mode 100644
index 0000000..d104bb9
--- /dev/null
+++ b/sys/kern/vfs_vnops.c
@@ -0,0 +1,422 @@
+/*
+ * 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	8.2 (Berkeley) 1/21/94
+ */
+
+#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 <vm/vm.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;
+			LEASE_CHECK(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) {
+			if (error = VOP_ACCESS(vp, VREAD, cred, p))
+				goto bad;
+		}
+		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);				/* XXX */
+		LEASE_CHECK(vp, p, cred, LEASE_WRITE);
+		VOP_LOCK(vp);				/* 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 (fmode & FWRITE)
+		vp->v_writecount++;
+	return (0);
+bad:
+	vput(vp);
+	return (error);
+}
+
+/*
+ * Check for write permissions on the specified vnode.
+ * The read-only status of the file system is checked.
+ * Also, prototype text segments cannot be written.
+ */
+vn_writechk(vp)
+	register struct vnode *vp;
+{
+
+	/*
+	 * Disallow write attempts on read-only file systems;
+	 * unless the file is a socket or a block or character
+	 * device resident on the file system.
+	 */
+	if (vp->v_mount->mnt_flag & MNT_RDONLY) {
+		switch (vp->v_type) {
+		case VREG: case VDIR: case VLNK:
+			return (EROFS);
+		}
+	}
+	/*
+	 * If there's shared text associated with
+	 * the vnode, try to free it up once.  If
+	 * we fail, we can't allow writing.
+	 */
+	if ((vp->v_flag & VTEXT) && !vnode_pager_uncache(vp))
+		return (ETXTBSY);
+	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;
+
+	if (flags & FWRITE)
+		vp->v_writecount--;
+	error = VOP_CLOSE(vp, flags, cred, p);
+	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;
+
+	if ((ioflg & IO_NODELOCKED) == 0)
+		VOP_LOCK(vp);
+	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);
+	return (error);
+}
+
+/*
+ * File table vnode read routine.
+ */
+vn_read(fp, uio, cred)
+	struct file *fp;
+	struct uio *uio;
+	struct ucred *cred;
+{
+	register struct vnode *vp = (struct vnode *)fp->f_data;
+	int count, error;
+
+	LEASE_CHECK(vp, uio->uio_procp, cred, LEASE_READ);
+	VOP_LOCK(vp);
+	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);
+	return (error);
+}
+
+/*
+ * File table vnode write routine.
+ */
+vn_write(fp, uio, cred)
+	struct file *fp;
+	struct uio *uio;
+	struct ucred *cred;
+{
+	register struct vnode *vp = (struct vnode *)fp->f_data;
+	int count, error, ioflag = 0;
+
+	if (vp->v_type == VREG && (fp->f_flag & O_APPEND))
+		ioflag |= IO_APPEND;
+	if (fp->f_flag & FNONBLOCK)
+		ioflag |= IO_NDELAY;
+	LEASE_CHECK(vp, uio->uio_procp, cred, LEASE_WRITE);
+	VOP_LOCK(vp);
+	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;
+	VOP_UNLOCK(vp);
+	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;
+	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;
+	int 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) {
+			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));
+}
+
+/*
+ * 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));
+}