X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/2c3059b12521d35820e41bed7b6b9322bb45a87c..4f1ff4751928a7b15018da94731705d3f421ee6e:/usr/src/sys/ufs/ffs/ffs_vnops.c

diff --git a/usr/src/sys/ufs/ffs/ffs_vnops.c b/usr/src/sys/ufs/ffs/ffs_vnops.c
index 707108bc9f..9c9015f74b 100644
--- a/usr/src/sys/ufs/ffs/ffs_vnops.c
+++ b/usr/src/sys/ufs/ffs/ffs_vnops.c
@@ -1,276 +1,1716 @@
-/*	ffs_vnops.c	4.4	%G%	*/
-
-#include "../h/param.h"
-#include "../h/systm.h"
-#include "../h/mount.h"
-#include "../h/ino.h"
-#include "../h/reg.h"
-#include "../h/buf.h"
-#include "../h/filsys.h"
-#include "../h/dir.h"
-#include "../h/user.h"
-#include "../h/inode.h"
-#include "../h/file.h"
-#include "../h/conf.h"
-#include "../h/stat.h"
-#include "../h/inline.h"
-
-/*
- * the fstat system call.
- */
-fstat()
-{
-	register struct file *fp;
-	register struct a {
-		int	fdes;
-		struct stat *sb;
-	} *uap;
-
-	uap = (struct a *)u.u_ap;
-	fp = getf(uap->fdes);
-	if(fp == NULL)
-		return;
-	stat1(fp->f_inode, uap->sb, fp->f_flag&FPIPE? fp->f_un.f_offset: 0);
+/*
+ * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *	@(#)ffs_vnops.c	7.39 (Berkeley) %G%
+ */
+
+#include "param.h"
+#include "systm.h"
+#include "user.h"
+#include "kernel.h"
+#include "file.h"
+#include "stat.h"
+#include "buf.h"
+#include "proc.h"
+#include "socket.h"
+#include "socketvar.h"
+#include "conf.h"
+#include "mount.h"
+#include "vnode.h"
+#include "specdev.h"
+#include "../ufs/quota.h"
+#include "../ufs/inode.h"
+#include "../ufs/fs.h"
+
+/*
+ * Global vfs data structures for ufs
+ */
+
+int	ufs_lookup(),
+	ufs_create(),
+	ufs_mknod(),
+	ufs_open(),
+	ufs_close(),
+	ufs_access(),
+	ufs_getattr(),
+	ufs_setattr(),
+	ufs_read(),
+	ufs_write(),
+	ufs_ioctl(),
+	ufs_select(),
+	ufs_mmap(),
+	ufs_fsync(),
+	ufs_seek(),
+	ufs_remove(),
+	ufs_link(),
+	ufs_rename(),
+	ufs_mkdir(),
+	ufs_rmdir(),
+	ufs_symlink(),
+	ufs_readdir(),
+	ufs_readlink(),
+	ufs_abortop(),
+	ufs_inactive(),
+	ufs_reclaim(),
+	ufs_lock(),
+	ufs_unlock(),
+	ufs_bmap(),
+	ufs_strategy(),
+	ufs_print(),
+	ufs_islocked();
+
+struct vnodeops ufs_vnodeops = {
+	ufs_lookup,		/* lookup */
+	ufs_create,		/* create */
+	ufs_mknod,		/* mknod */
+	ufs_open,		/* open */
+	ufs_close,		/* close */
+	ufs_access,		/* access */
+	ufs_getattr,		/* getattr */
+	ufs_setattr,		/* setattr */
+	ufs_read,		/* read */
+	ufs_write,		/* write */
+	ufs_ioctl,		/* ioctl */
+	ufs_select,		/* select */
+	ufs_mmap,		/* mmap */
+	ufs_fsync,		/* fsync */
+	ufs_seek,		/* seek */
+	ufs_remove,		/* remove */
+	ufs_link,		/* link */
+	ufs_rename,		/* rename */
+	ufs_mkdir,		/* mkdir */
+	ufs_rmdir,		/* rmdir */
+	ufs_symlink,		/* symlink */
+	ufs_readdir,		/* readdir */
+	ufs_readlink,		/* readlink */
+	ufs_abortop,		/* abortop */
+	ufs_inactive,		/* inactive */
+	ufs_reclaim,		/* reclaim */
+	ufs_lock,		/* lock */
+	ufs_unlock,		/* unlock */
+	ufs_bmap,		/* bmap */
+	ufs_strategy,		/* strategy */
+	ufs_print,		/* print */
+	ufs_islocked,		/* islocked */
+};
+
+int	spec_lookup(),
+	spec_open(),
+	ufsspec_read(),
+	ufsspec_write(),
+	spec_strategy(),
+	spec_bmap(),
+	spec_ioctl(),
+	spec_select(),
+	ufsspec_close(),
+	spec_badop(),
+	spec_nullop();
+
+struct vnodeops spec_inodeops = {
+	spec_lookup,		/* lookup */
+	spec_badop,		/* create */
+	spec_badop,		/* mknod */
+	spec_open,		/* open */
+	ufsspec_close,		/* close */
+	ufs_access,		/* access */
+	ufs_getattr,		/* getattr */
+	ufs_setattr,		/* setattr */
+	ufsspec_read,		/* read */
+	ufsspec_write,		/* write */
+	spec_ioctl,		/* ioctl */
+	spec_select,		/* select */
+	spec_badop,		/* mmap */
+	spec_nullop,		/* fsync */
+	spec_badop,		/* seek */
+	spec_badop,		/* remove */
+	spec_badop,		/* link */
+	spec_badop,		/* rename */
+	spec_badop,		/* mkdir */
+	spec_badop,		/* rmdir */
+	spec_badop,		/* symlink */
+	spec_badop,		/* readdir */
+	spec_badop,		/* readlink */
+	spec_badop,		/* abortop */
+	ufs_inactive,		/* inactive */
+	ufs_reclaim,		/* reclaim */
+	ufs_lock,		/* lock */
+	ufs_unlock,		/* unlock */
+	spec_bmap,		/* bmap */
+	spec_strategy,		/* strategy */
+	ufs_print,		/* print */
+	ufs_islocked,		/* islocked */
+};
+
+#ifdef FIFO
+int	fifo_lookup(),
+	fifo_open(),
+	ufsfifo_read(),
+	ufsfifo_write(),
+	fifo_bmap(),
+	fifo_ioctl(),
+	fifo_select(),
+	ufsfifo_close(),
+	fifo_print(),
+	fifo_badop(),
+	fifo_nullop();
+
+struct vnodeops fifo_inodeops = {
+	fifo_lookup,		/* lookup */
+	fifo_badop,		/* create */
+	fifo_badop,		/* mknod */
+	fifo_open,		/* open */
+	ufsfifo_close,		/* close */
+	ufs_access,		/* access */
+	ufs_getattr,		/* getattr */
+	ufs_setattr,		/* setattr */
+	ufsfifo_read,		/* read */
+	ufsfifo_write,		/* write */
+	fifo_ioctl,		/* ioctl */
+	fifo_select,		/* select */
+	fifo_badop,		/* mmap */
+	fifo_nullop,		/* fsync */
+	fifo_badop,		/* seek */
+	fifo_badop,		/* remove */
+	fifo_badop,		/* link */
+	fifo_badop,		/* rename */
+	fifo_badop,		/* mkdir */
+	fifo_badop,		/* rmdir */
+	fifo_badop,		/* symlink */
+	fifo_badop,		/* readdir */
+	fifo_badop,		/* readlink */
+	fifo_badop,		/* abortop */
+	ufs_inactive,		/* inactive */
+	ufs_reclaim,		/* reclaim */
+	ufs_lock,		/* lock */
+	ufs_unlock,		/* unlock */
+	fifo_bmap,		/* bmap */
+	fifo_badop,		/* strategy */
+	ufs_print,		/* print */
+	ufs_islocked,		/* islocked */
+};
+#endif /* FIFO */
+
+enum vtype iftovt_tab[16] = {
+	VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
+	VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
+};
+int	vttoif_tab[9] = {
+	0, IFREG, IFDIR, IFBLK, IFCHR, IFLNK, IFSOCK, IFIFO, IFMT,
+};
+
+/*
+ * Create a regular file
+ */
+ufs_create(ndp, vap)
+	struct nameidata *ndp;
+	struct vattr *vap;
+{
+	struct inode *ip;
+	int error;
+
+	if (error = maknode(MAKEIMODE(vap->va_type, vap->va_mode), ndp, &ip))
+		return (error);
+	ndp->ni_vp = ITOV(ip);
+	return (0);
 }
 
 /*
- * the stat system call.
+ * Mknod vnode call
  */
-stat()
+/* ARGSUSED */
+ufs_mknod(ndp, vap, cred)
+	struct nameidata *ndp;
+	struct ucred *cred;
+	struct vattr *vap;
 {
-	register struct inode *ip;
-	register struct a {
-		char	*fname;
-		struct stat *sb;
-	} *uap;
-
-	uap = (struct a *)u.u_ap;
-	ip = namei(uchar, 0);
-	if(ip == NULL)
-		return;
-	stat1(ip, uap->sb, (off_t)0);
-	iput(ip);
+	register struct vnode *vp;
+	struct inode *ip;
+	int error;
+
+	if (error = maknode(MAKEIMODE(vap->va_type, vap->va_mode), ndp, &ip))
+		return (error);
+	ip->i_flag |= IACC|IUPD|ICHG;
+	if (vap->va_rdev != VNOVAL) {
+		/*
+		 * Want to be able to use this to make badblock
+		 * inodes, so don't truncate the dev number.
+		 */
+		ip->i_rdev = vap->va_rdev;
+	}
+	/*
+	 * Remove inode so that it will be reloaded by iget and
+	 * checked to see if it is an alias of an existing entry
+	 * in the inode cache.
+	 */
+	vp = ITOV(ip);
+	vput(vp);
+	vp->v_type = VNON;
+	vgone(vp);
+	return (0);
 }
 
 /*
- * The basic routine for fstat and stat:
- * get the inode and pass appropriate parts back.
+ * Open called.
+ *
+ * Nothing to do.
  */
-stat1(ip, ub, pipeadj)
-register struct inode *ip;
-struct stat *ub;
-off_t pipeadj;
+/* ARGSUSED */
+ufs_open(vp, mode, cred)
+	struct vnode *vp;
+	int mode;
+	struct ucred *cred;
 {
-	register struct dinode *dp;
-	register struct buf *bp;
-	struct stat ds;
 
-	IUPDAT(ip, &time, &time, 0);
+	return (0);
+}
+
+/*
+ * Close called
+ *
+ * Update the times on the inode.
+ */
+/* ARGSUSED */
+ufs_close(vp, fflag, cred)
+	struct vnode *vp;
+	int fflag;
+	struct ucred *cred;
+{
+	register struct inode *ip = VTOI(vp);
+
+	if (vp->v_usecount > 1 && !(ip->i_flag & ILOCKED))
+		ITIMES(ip, &time, &time);
+	return (0);
+}
+
+/*
+ * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
+ * The mode is shifted to select the owner/group/other fields. The
+ * super user is granted all permissions.
+ */
+ufs_access(vp, mode, cred)
+	struct vnode *vp;
+	register int mode;
+	struct ucred *cred;
+{
+	register struct inode *ip = VTOI(vp);
+	register gid_t *gp;
+	int i, error;
+
+#ifdef DIAGNOSTIC
+	if (!VOP_ISLOCKED(vp)) {
+		vprint("ufs_access: not locked", vp);
+		panic("ufs_access: not locked");
+	}
+#endif
+#ifdef QUOTA
+	if (mode & VWRITE) {
+		switch (vp->v_type) {
+		case VREG: case VDIR: case VLNK:
+			if (error = getinoquota(ip))
+				return (error);
+		}
+	}
+#endif /* QUOTA */
 	/*
-	 * first copy from inode table
+	 * If you're the super-user, you always get access.
 	 */
-	ds.st_dev = ip->i_dev;
-	ds.st_ino = ip->i_number;
-	ds.st_mode = ip->i_mode;
-	ds.st_nlink = ip->i_nlink;
-	ds.st_uid = ip->i_uid;
-	ds.st_gid = ip->i_gid;
-	ds.st_rdev = (dev_t)ip->i_un.i_rdev;
-	ds.st_size = ip->i_size - pipeadj;
+	if (cred->cr_uid == 0)
+		return (0);
 	/*
-	 * next the dates in the disk
+	 * Access check is based on only one of owner, group, public.
+	 * If not owner, then check group. If not a member of the
+	 * group, then check public access.
 	 */
-	bp = bread(ip->i_dev, itod(ip->i_number));
-	dp = bp->b_un.b_dino;
-	dp += itoo(ip->i_number);
-	ds.st_atime = dp->di_atime;
-	ds.st_mtime = dp->di_mtime;
-	ds.st_ctime = dp->di_ctime;
-	brelse(bp);
-	if (copyout((caddr_t)&ds, (caddr_t)ub, sizeof(ds)) < 0)
-		u.u_error = EFAULT;
-}
-
-/*
- * the dup system call.
- */
-dup()
-{
-	register struct file *fp;
-	register struct a {
-		int	fdes;
-		int	fdes2;
-	} *uap;
-	register i, m;
-
-	uap = (struct a *)u.u_ap;
-	m = uap->fdes & ~077;
-	uap->fdes &= 077;
-	fp = getf(uap->fdes);
-	if(fp == NULL)
-		return;
-	if ((m&0100) == 0) {
-		if ((i = ufalloc()) < 0)
-			return;
-	} else {
-		i = uap->fdes2;
-		if (i<0 || i>=NOFILE) {
-			u.u_error = EBADF;
-			return;
+	if (cred->cr_uid != ip->i_uid) {
+		mode >>= 3;
+		gp = cred->cr_groups;
+		for (i = 0; i < cred->cr_ngroups; i++, gp++)
+			if (ip->i_gid == *gp)
+				goto found;
+		mode >>= 3;
+found:
+		;
+	}
+	if ((ip->i_mode & mode) != 0)
+		return (0);
+	return (EACCES);
+}
+
+/* ARGSUSED */
+ufs_getattr(vp, vap, cred)
+	struct vnode *vp;
+	register struct vattr *vap;
+	struct ucred *cred;
+{
+	register struct inode *ip = VTOI(vp);
+
+	ITIMES(ip, &time, &time);
+	/*
+	 * Copy from inode table
+	 */
+	vap->va_fsid = ip->i_dev;
+	vap->va_fileid = ip->i_number;
+	vap->va_mode = ip->i_mode & ~IFMT;
+	vap->va_nlink = ip->i_nlink;
+	vap->va_uid = ip->i_uid;
+	vap->va_gid = ip->i_gid;
+	vap->va_rdev = (dev_t)ip->i_rdev;
+#ifdef tahoe
+	vap->va_size = ip->i_size;
+	vap->va_size_rsv = 0;
+#else
+	vap->va_qsize = ip->i_din.di_qsize;
+#endif
+	vap->va_atime.tv_sec = ip->i_atime;
+	vap->va_atime.tv_usec = 0;
+	vap->va_mtime.tv_sec = ip->i_mtime;
+	vap->va_mtime.tv_usec = 0;
+	vap->va_ctime.tv_sec = ip->i_ctime;
+	vap->va_ctime.tv_usec = 0;
+	vap->va_flags = ip->i_flags;
+	vap->va_gen = ip->i_gen;
+	/* this doesn't belong here */
+	if (vp->v_type == VBLK)
+		vap->va_blocksize = BLKDEV_IOSIZE;
+	else if (vp->v_type == VCHR)
+		vap->va_blocksize = MAXBSIZE;
+	else
+		vap->va_blocksize = ip->i_fs->fs_bsize;
+	vap->va_bytes = dbtob(ip->i_blocks);
+	vap->va_bytes_rsv = 0;
+	vap->va_type = vp->v_type;
+	return (0);
+}
+
+/*
+ * Set attribute vnode op. called from several syscalls
+ */
+ufs_setattr(vp, vap, cred)
+	register struct vnode *vp;
+	register struct vattr *vap;
+	register struct ucred *cred;
+{
+	register struct inode *ip = VTOI(vp);
+	int error = 0;
+
+	/*
+	 * Check for unsetable attributes.
+	 */
+	if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
+	    (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
+	    (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
+	    ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
+		return (EINVAL);
+	}
+	/*
+	 * Go through the fields and update iff not VNOVAL.
+	 */
+	if (vap->va_uid != (u_short)VNOVAL || vap->va_gid != (u_short)VNOVAL)
+		if (error = chown1(vp, vap->va_uid, vap->va_gid, cred))
+			return (error);
+	if (vap->va_size != VNOVAL) {
+		if (vp->v_type == VDIR)
+			return (EISDIR);
+		if (error = itrunc(ip, vap->va_size, 0)) /* XXX IO_SYNC? */
+			return (error);
+	}
+	if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
+		if (cred->cr_uid != ip->i_uid &&
+		    (error = suser(cred, &u.u_acflag)))
+			return (error);
+		if (vap->va_atime.tv_sec != VNOVAL)
+			ip->i_flag |= IACC;
+		if (vap->va_mtime.tv_sec != VNOVAL)
+			ip->i_flag |= IUPD;
+		ip->i_flag |= ICHG;
+		if (error = iupdat(ip, &vap->va_atime, &vap->va_mtime, 1))
+			return (error);
+	}
+	if (vap->va_mode != (u_short)VNOVAL)
+		error = chmod1(vp, (int)vap->va_mode, cred);
+	if (vap->va_flags != VNOVAL) {
+		if (cred->cr_uid != ip->i_uid &&
+		    (error = suser(cred, &u.u_acflag)))
+			return (error);
+		if (cred->cr_uid == 0) {
+			ip->i_flags = vap->va_flags;
+		} else {
+			ip->i_flags &= 0xffff0000;
+			ip->i_flags |= (vap->va_flags & 0xffff);
 		}
-		if (u.u_vrpages[i]) {
-			u.u_error = ETXTBSY;
-			return;
+		ip->i_flag |= ICHG;
+	}
+	return (error);
+}
+
+/*
+ * Change the mode on a file.
+ * Inode must be locked before calling.
+ */
+chmod1(vp, mode, cred)
+	register struct vnode *vp;
+	register int mode;
+	struct ucred *cred;
+{
+	register struct inode *ip = VTOI(vp);
+	int error;
+
+	if (cred->cr_uid != ip->i_uid &&
+	    (error = suser(cred, &u.u_acflag)))
+		return (error);
+	ip->i_mode &= ~07777;
+	if (cred->cr_uid) {
+		if (vp->v_type != VDIR)
+			mode &= ~ISVTX;
+		if (!groupmember(ip->i_gid, cred))
+			mode &= ~ISGID;
+	}
+	ip->i_mode |= mode & 07777;
+	ip->i_flag |= ICHG;
+	if ((vp->v_flag & VTEXT) && (ip->i_mode & ISVTX) == 0)
+		xrele(vp);
+	return (0);
+}
+
+/*
+ * Perform chown operation on inode ip;
+ * inode must be locked prior to call.
+ */
+chown1(vp, uid, gid, cred)
+	register struct vnode *vp;
+	uid_t uid;
+	gid_t gid;
+	struct ucred *cred;
+{
+	register struct inode *ip = VTOI(vp);
+	uid_t ouid;
+	gid_t ogid;
+	int error = 0;
+#ifdef QUOTA
+	register int i;
+	long change;
+#endif
+
+	if (uid == (u_short)VNOVAL)
+		uid = ip->i_uid;
+	if (gid == (u_short)VNOVAL)
+		gid = ip->i_gid;
+	/*
+	 * If we don't own the file, are trying to change the owner
+	 * of the file, or are not a member of the target group,
+	 * the caller must be superuser or the call fails.
+	 */
+	if ((cred->cr_uid != ip->i_uid || uid != ip->i_uid ||
+	    !groupmember((gid_t)gid, cred)) &&
+	    (error = suser(cred, &u.u_acflag)))
+		return (error);
+	ouid = ip->i_uid;
+	ogid = ip->i_gid;
+#ifdef QUOTA
+	if (error = getinoquota(ip))
+		return (error);
+	if (ouid == uid) {
+		dqrele(vp, ip->i_dquot[USRQUOTA]);
+		ip->i_dquot[USRQUOTA] = NODQUOT;
+	}
+	if (ogid == gid) {
+		dqrele(vp, ip->i_dquot[GRPQUOTA]);
+		ip->i_dquot[GRPQUOTA] = NODQUOT;
+	}
+	change = ip->i_blocks;
+	(void) chkdq(ip, -change, cred, CHOWN);
+	(void) chkiq(ip, -1, cred, CHOWN);
+	for (i = 0; i < MAXQUOTAS; i++) {
+		dqrele(vp, ip->i_dquot[i]);
+		ip->i_dquot[i] = NODQUOT;
+	}
+#endif
+	ip->i_uid = uid;
+	ip->i_gid = gid;
+#ifdef QUOTA
+	if ((error = getinoquota(ip)) == 0) {
+		if (ouid == uid) {
+			dqrele(vp, ip->i_dquot[USRQUOTA]);
+			ip->i_dquot[USRQUOTA] = NODQUOT;
+		}
+		if (ogid == gid) {
+			dqrele(vp, ip->i_dquot[GRPQUOTA]);
+			ip->i_dquot[GRPQUOTA] = NODQUOT;
+		}
+		if ((error = chkdq(ip, change, cred, CHOWN)) == 0) {
+			if ((error = chkiq(ip, 1, cred, CHOWN)) == 0)
+				return (0);
+			else
+				(void) chkdq(ip, -change, cred, CHOWN|FORCE);
+		}
+		for (i = 0; i < MAXQUOTAS; i++) {
+			dqrele(vp, ip->i_dquot[i]);
+			ip->i_dquot[i] = NODQUOT;
 		}
-		u.u_r.r_val1 = i;
 	}
-	if (i!=uap->fdes) {
-		if (u.u_ofile[i]!=NULL)
-			closef(u.u_ofile[i]);
-		u.u_ofile[i] = fp;
-		fp->f_count++;
+	ip->i_uid = ouid;
+	ip->i_gid = ogid;
+	if (getinoquota(ip) == 0) {
+		if (ouid == uid) {
+			dqrele(vp, ip->i_dquot[USRQUOTA]);
+			ip->i_dquot[USRQUOTA] = NODQUOT;
+		}
+		if (ogid == gid) {
+			dqrele(vp, ip->i_dquot[GRPQUOTA]);
+			ip->i_dquot[GRPQUOTA] = NODQUOT;
+		}
+		(void) chkdq(ip, change, cred, FORCE);
+		(void) chkiq(ip, 1, cred, FORCE);
 	}
+	if (error)
+		return (error);
+#endif
+	if (ouid != uid || ogid != gid)
+		ip->i_flag |= ICHG;
+	if (ouid != uid && cred->cr_uid != 0)
+		ip->i_mode &= ~ISUID;
+	if (ogid != gid && cred->cr_uid != 0)
+		ip->i_mode &= ~ISGID;
+	return (0);
 }
 
 /*
- * the mount system call.
+ * Vnode op for reading.
  */
-smount()
+/* ARGSUSED */
+ufs_read(vp, uio, ioflag, cred)
+	struct vnode *vp;
+	register struct uio *uio;
+	int ioflag;
+	struct ucred *cred;
 {
-	dev_t dev;
-	register struct inode *ip;
-	register struct mount *mp;
-	struct mount *smp;
-	register struct filsys *fp;
+	register struct inode *ip = VTOI(vp);
+	register struct fs *fs;
 	struct buf *bp;
-	register struct a {
-		char	*fspec;
-		char	*freg;
-		int	ronly;
-	} *uap;
-
-	uap = (struct a *)u.u_ap;
-	dev = getmdev();
-	if(u.u_error)
-		return;
-	u.u_dirp = (caddr_t)uap->freg;
-	ip = namei(uchar, 0);
-	if(ip == NULL)
-		return;
-	if(ip->i_count!=1 || (ip->i_mode&(IFBLK&IFCHR))!=0)
+	daddr_t lbn, bn, rablock;
+	int size, diff, error = 0;
+	long n, on, type;
+
+	if (uio->uio_rw != UIO_READ)
+		panic("ufs_read mode");
+	type = ip->i_mode & IFMT;
+	if (type != IFDIR && type != IFREG && type != IFLNK)
+		panic("ufs_read type");
+	if (uio->uio_resid == 0)
+		return (0);
+	if (uio->uio_offset < 0)
+		return (EINVAL);
+	ip->i_flag |= IACC;
+	fs = ip->i_fs;
+	do {
+		lbn = lblkno(fs, uio->uio_offset);
+		on = blkoff(fs, uio->uio_offset);
+		n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid);
+		diff = ip->i_size - uio->uio_offset;
+		if (diff <= 0)
+			return (0);
+		if (diff < n)
+			n = diff;
+		size = blksize(fs, ip, lbn);
+		rablock = lbn + 1;
+		if (vp->v_lastr + 1 == lbn &&
+		    lblktosize(fs, rablock) < ip->i_size)
+			error = breada(ITOV(ip), lbn, size, rablock,
+				blksize(fs, ip, rablock), NOCRED, &bp);
+		else
+			error = bread(ITOV(ip), lbn, size, NOCRED, &bp);
+		vp->v_lastr = lbn;
+		n = MIN(n, size - bp->b_resid);
+		if (error) {
+			brelse(bp);
+			return (error);
+		}
+		error = uiomove(bp->b_un.b_addr + on, (int)n, uio);
+		if (n + on == fs->fs_bsize || uio->uio_offset == ip->i_size)
+			bp->b_flags |= B_AGE;
+		brelse(bp);
+	} while (error == 0 && uio->uio_resid > 0 && n != 0);
+	return (error);
+}
+
+/*
+ * Vnode op for writing.
+ */
+ufs_write(vp, uio, ioflag, cred)
+	register struct vnode *vp;
+	struct uio *uio;
+	int ioflag;
+	struct ucred *cred;
+{
+	register struct inode *ip = VTOI(vp);
+	register struct fs *fs;
+	struct buf *bp;
+	daddr_t lbn, bn;
+	u_long osize;
+	int i, n, on, flags;
+	int count, size, resid, error = 0;
+
+	if (uio->uio_rw != UIO_WRITE)
+		panic("ufs_write mode");
+	switch (vp->v_type) {
+	case VREG:
+		if (ioflag & IO_APPEND)
+			uio->uio_offset = ip->i_size;
+		/* fall through */
+	case VLNK:
+		break;
+
+	case VDIR:
+		if ((ioflag & IO_SYNC) == 0)
+			panic("ufs_write nonsync dir write");
+		break;
+
+	default:
+		panic("ufs_write type");
+	}
+	if (uio->uio_offset < 0)
+		return (EINVAL);
+	if (uio->uio_resid == 0)
+		return (0);
+	/*
+	 * Maybe this should be above the vnode op call, but so long as
+	 * file servers have no limits, i don't think it matters
+	 */
+	if (vp->v_type == VREG &&
+	    uio->uio_offset + uio->uio_resid >
+	      u.u_rlimit[RLIMIT_FSIZE].rlim_cur) {
+		psignal(u.u_procp, SIGXFSZ);
+		return (EFBIG);
+	}
+	resid = uio->uio_resid;
+	osize = ip->i_size;
+	fs = ip->i_fs;
+	flags = 0;
+	if (ioflag & IO_SYNC)
+		flags = B_SYNC;
+	do {
+		lbn = lblkno(fs, uio->uio_offset);
+		on = blkoff(fs, uio->uio_offset);
+		n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid);
+		if (n < fs->fs_bsize)
+			flags |= B_CLRBUF;
+		else
+			flags &= ~B_CLRBUF;
+		if (error = balloc(ip, lbn, (int)(on + n), &bp, flags))
+			break;
+		bn = bp->b_blkno;
+		if (uio->uio_offset + n > ip->i_size)
+			ip->i_size = uio->uio_offset + n;
+		size = blksize(fs, ip, lbn);
+		count = howmany(size, CLBYTES);
+		for (i = 0; i < count; i++)
+			munhash(ip->i_devvp, bn + i * CLBYTES / DEV_BSIZE);
+		n = MIN(n, size - bp->b_resid);
+		error = uiomove(bp->b_un.b_addr + on, n, uio);
+		if (ioflag & IO_SYNC)
+			(void) bwrite(bp);
+		else if (n + on == fs->fs_bsize) {
+			bp->b_flags |= B_AGE;
+			bawrite(bp);
+		} else
+			bdwrite(bp);
+		ip->i_flag |= IUPD|ICHG;
+		if (cred->cr_uid != 0)
+			ip->i_mode &= ~(ISUID|ISGID);
+	} while (error == 0 && uio->uio_resid > 0 && n != 0);
+	if (error && (ioflag & IO_UNIT)) {
+		(void) itrunc(ip, osize, ioflag & IO_SYNC);
+		uio->uio_offset -= resid - uio->uio_resid;
+		uio->uio_resid = resid;
+	}
+	return (error);
+}
+
+/* ARGSUSED */
+ufs_ioctl(vp, com, data, fflag, cred)
+	struct vnode *vp;
+	int com;
+	caddr_t data;
+	int fflag;
+	struct ucred *cred;
+{
+
+	return (ENOTTY);
+}
+
+/* ARGSUSED */
+ufs_select(vp, which, fflags, cred)
+	struct vnode *vp;
+	int which, fflags;
+	struct ucred *cred;
+{
+
+	return (1);		/* XXX */
+}
+
+/*
+ * Mmap a file
+ *
+ * NB Currently unsupported.
+ */
+/* ARGSUSED */
+ufs_mmap(vp, fflags, cred)
+	struct vnode *vp;
+	int fflags;
+	struct ucred *cred;
+{
+
+	return (EINVAL);
+}
+
+/*
+ * Synch an open file.
+ */
+/* ARGSUSED */
+ufs_fsync(vp, fflags, cred, waitfor)
+	struct vnode *vp;
+	int fflags;
+	struct ucred *cred;
+	int waitfor;
+{
+	struct inode *ip = VTOI(vp);
+
+	if (fflags&FWRITE)
+		ip->i_flag |= ICHG;
+	vflushbuf(vp, waitfor == MNT_WAIT ? B_SYNC : 0);
+	return (iupdat(ip, &time, &time, waitfor == MNT_WAIT));
+}
+
+/*
+ * Seek on a file
+ *
+ * Nothing to do, so just return.
+ */
+/* ARGSUSED */
+ufs_seek(vp, oldoff, newoff, cred)
+	struct vnode *vp;
+	off_t oldoff, newoff;
+	struct ucred *cred;
+{
+
+	return (0);
+}
+
+/*
+ * ufs remove
+ * Hard to avoid races here, especially
+ * in unlinking directories.
+ */
+ufs_remove(ndp)
+	struct nameidata *ndp;
+{
+	register struct inode *ip, *dp;
+	int error;
+
+	ip = VTOI(ndp->ni_vp);
+	dp = VTOI(ndp->ni_dvp);
+	error = dirremove(ndp);
+	if (!error) {
+		ip->i_nlink--;
+		ip->i_flag |= ICHG;
+	}
+	if (dp == ip)
+		vrele(ITOV(ip));
+	else
+		iput(ip);
+	iput(dp);
+	return (error);
+}
+
+/*
+ * link vnode call
+ */
+ufs_link(vp, ndp)
+	register struct vnode *vp;
+	register struct nameidata *ndp;
+{
+	register struct inode *ip = VTOI(vp);
+	int error;
+
+	if (ndp->ni_dvp != vp)
+		ILOCK(ip);
+	if (ip->i_nlink == LINK_MAX - 1) {
+		error = EMLINK;
 		goto out;
-	smp = NULL;
-	for(mp = &mount[0]; mp < &mount[NMOUNT]; mp++) {
-		if(mp->m_bufp != NULL) {
-			if(dev == mp->m_dev)
+	}
+	ip->i_nlink++;
+	ip->i_flag |= ICHG;
+	error = iupdat(ip, &time, &time, 1);
+	if (!error)
+		error = direnter(ip, ndp);
+out:
+	if (ndp->ni_dvp != vp)
+		IUNLOCK(ip);
+	if (error) {
+		ip->i_nlink--;
+		ip->i_flag |= ICHG;
+	}
+	return (error);
+}
+
+/*
+ * Rename system call.
+ * 	rename("foo", "bar");
+ * is essentially
+ *	unlink("bar");
+ *	link("foo", "bar");
+ *	unlink("foo");
+ * but ``atomically''.  Can't do full commit without saving state in the
+ * inode on disk which isn't feasible at this time.  Best we can do is
+ * always guarantee the target exists.
+ *
+ * Basic algorithm is:
+ *
+ * 1) Bump link count on source while we're linking it to the
+ *    target.  This also ensure the inode won't be deleted out
+ *    from underneath us while we work (it may be truncated by
+ *    a concurrent `trunc' or `open' for creation).
+ * 2) Link source to destination.  If destination already exists,
+ *    delete it first.
+ * 3) Unlink source reference to inode if still around. If a
+ *    directory was moved and the parent of the destination
+ *    is different from the source, patch the ".." entry in the
+ *    directory.
+ */
+ufs_rename(fndp, tndp)
+	register struct nameidata *fndp, *tndp;
+{
+	register struct inode *ip, *xp, *dp;
+	struct dirtemplate dirbuf;
+	int doingdirectory = 0, oldparent = 0, newparent = 0;
+	int error = 0;
+
+	dp = VTOI(fndp->ni_dvp);
+	ip = VTOI(fndp->ni_vp);
+	ILOCK(ip);
+	if ((ip->i_mode&IFMT) == IFDIR) {
+		register struct direct *d = &fndp->ni_dent;
+
+		/*
+		 * Avoid ".", "..", and aliases of "." for obvious reasons.
+		 */
+		if ((d->d_namlen == 1 && d->d_name[0] == '.') || dp == ip ||
+		    fndp->ni_isdotdot || (ip->i_flag & IRENAME)) {
+			IUNLOCK(ip);
+			ufs_abortop(fndp);
+			ufs_abortop(tndp);
+			return (EINVAL);
+		}
+		ip->i_flag |= IRENAME;
+		oldparent = dp->i_number;
+		doingdirectory++;
+	}
+	vrele(fndp->ni_dvp);
+
+	/*
+	 * 1) Bump link count while we're moving stuff
+	 *    around.  If we crash somewhere before
+	 *    completing our work, the link count
+	 *    may be wrong, but correctable.
+	 */
+	ip->i_nlink++;
+	ip->i_flag |= ICHG;
+	error = iupdat(ip, &time, &time, 1);
+	IUNLOCK(ip);
+
+	/*
+	 * When the target exists, both the directory
+	 * and target vnodes are returned locked.
+	 */
+	dp = VTOI(tndp->ni_dvp);
+	xp = NULL;
+	if (tndp->ni_vp)
+		xp = VTOI(tndp->ni_vp);
+	/*
+	 * If ".." must be changed (ie the directory gets a new
+	 * parent) then the source directory must not be in the
+	 * directory heirarchy above the target, as this would
+	 * orphan everything below the source directory. Also
+	 * the user must have write permission in the source so
+	 * as to be able to change "..". We must repeat the call 
+	 * to namei, as the parent directory is unlocked by the
+	 * call to checkpath().
+	 */
+	if (oldparent != dp->i_number)
+		newparent = dp->i_number;
+	if (doingdirectory && newparent) {
+		VOP_LOCK(fndp->ni_vp);
+		error = ufs_access(fndp->ni_vp, VWRITE, tndp->ni_cred);
+		VOP_UNLOCK(fndp->ni_vp);
+		if (error)
+			goto bad;
+		tndp->ni_nameiop = RENAME | LOCKPARENT | LOCKLEAF | NOCACHE;
+		do {
+			dp = VTOI(tndp->ni_dvp);
+			if (xp != NULL)
+				iput(xp);
+			if (error = checkpath(ip, dp, tndp->ni_cred))
 				goto out;
-		} else
-		if(smp == NULL)
-			smp = mp;
+			if (error = namei(tndp))
+				goto out;
+			xp = NULL;
+			if (tndp->ni_vp)
+				xp = VTOI(tndp->ni_vp);
+		} while (dp != VTOI(tndp->ni_dvp));
+	}
+	/*
+	 * 2) If target doesn't exist, link the target
+	 *    to the source and unlink the source. 
+	 *    Otherwise, rewrite the target directory
+	 *    entry to reference the source inode and
+	 *    expunge the original entry's existence.
+	 */
+	if (xp == NULL) {
+		if (dp->i_dev != ip->i_dev)
+			panic("rename: EXDEV");
+		/*
+		 * Account for ".." in new directory.
+		 * When source and destination have the same
+		 * parent we don't fool with the link count.
+		 */
+		if (doingdirectory && newparent) {
+			dp->i_nlink++;
+			dp->i_flag |= ICHG;
+			error = iupdat(dp, &time, &time, 1);
+		}
+		if (error = direnter(ip, tndp))
+			goto out;
+	} else {
+		if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
+			panic("rename: EXDEV");
+		/*
+		 * Short circuit rename(foo, foo).
+		 */
+		if (xp->i_number == ip->i_number)
+			panic("rename: same file");
+		/*
+		 * If the parent directory is "sticky", then the user must
+		 * own the parent directory, or the destination of the rename,
+		 * otherwise the destination may not be changed (except by
+		 * root). This implements append-only directories.
+		 */
+		if ((dp->i_mode & ISVTX) && tndp->ni_cred->cr_uid != 0 &&
+		    tndp->ni_cred->cr_uid != dp->i_uid &&
+		    xp->i_uid != tndp->ni_cred->cr_uid) {
+			error = EPERM;
+			goto bad;
+		}
+		/*
+		 * Target must be empty if a directory
+		 * and have no links to it.
+		 * Also, insure source and target are
+		 * compatible (both directories, or both
+		 * not directories).
+		 */
+		if ((xp->i_mode&IFMT) == IFDIR) {
+			if (!dirempty(xp, dp->i_number, tndp->ni_cred) || 
+			    xp->i_nlink > 2) {
+				error = ENOTEMPTY;
+				goto bad;
+			}
+			if (!doingdirectory) {
+				error = ENOTDIR;
+				goto bad;
+			}
+			cache_purge(ITOV(dp));
+		} else if (doingdirectory) {
+			error = EISDIR;
+			goto bad;
+		}
+		if (error = dirrewrite(dp, ip, tndp))
+			goto bad;
+		vput(ITOV(dp));
+		/*
+		 * Adjust the link count of the target to
+		 * reflect the dirrewrite above.  If this is
+		 * a directory it is empty and there are
+		 * no links to it, so we can squash the inode and
+		 * any space associated with it.  We disallowed
+		 * renaming over top of a directory with links to
+		 * it above, as the remaining link would point to
+		 * a directory without "." or ".." entries.
+		 */
+		xp->i_nlink--;
+		if (doingdirectory) {
+			if (--xp->i_nlink != 0)
+				panic("rename: linked directory");
+			error = itrunc(xp, (u_long)0, IO_SYNC);
+		}
+		xp->i_flag |= ICHG;
+		iput(xp);
+		xp = NULL;
 	}
-	mp = smp;
-	if(mp == NULL)
+
+	/*
+	 * 3) Unlink the source.
+	 */
+	fndp->ni_nameiop = DELETE | LOCKPARENT | LOCKLEAF;
+	(void)namei(fndp);
+	if (fndp->ni_vp != NULL) {
+		xp = VTOI(fndp->ni_vp);
+		dp = VTOI(fndp->ni_dvp);
+	} else {
+		if (fndp->ni_dvp != NULL)
+			vput(fndp->ni_dvp);
+		xp = NULL;
+		dp = NULL;
+	}
+	/*
+	 * Ensure that the directory entry still exists and has not
+	 * changed while the new name has been entered. If the source is
+	 * a file then the entry may have been unlinked or renamed. In
+	 * either case there is no further work to be done. If the source
+	 * is a directory then it cannot have been rmdir'ed; its link
+	 * count of three would cause a rmdir to fail with ENOTEMPTY.
+	 * The IRENAME flag ensures that it cannot be moved by another
+	 * rename.
+	 */
+	if (xp != ip) {
+		if (doingdirectory)
+			panic("rename: lost dir entry");
+	} else {
+		/*
+		 * If the source is a directory with a
+		 * new parent, the link count of the old
+		 * parent directory must be decremented
+		 * and ".." set to point to the new parent.
+		 */
+		if (doingdirectory && newparent) {
+			dp->i_nlink--;
+			dp->i_flag |= ICHG;
+			error = vn_rdwr(UIO_READ, ITOV(xp), (caddr_t)&dirbuf,
+				sizeof (struct dirtemplate), (off_t)0,
+				UIO_SYSSPACE, IO_NODELOCKED, 
+				tndp->ni_cred, (int *)0);
+			if (error == 0) {
+				if (dirbuf.dotdot_namlen != 2 ||
+				    dirbuf.dotdot_name[0] != '.' ||
+				    dirbuf.dotdot_name[1] != '.') {
+					dirbad(xp, 12, "rename: mangled dir");
+				} else {
+					dirbuf.dotdot_ino = newparent;
+					(void) vn_rdwr(UIO_WRITE, ITOV(xp),
+					    (caddr_t)&dirbuf,
+					    sizeof (struct dirtemplate),
+					    (off_t)0, UIO_SYSSPACE,
+					    IO_NODELOCKED|IO_SYNC,
+					    tndp->ni_cred, (int *)0);
+					cache_purge(ITOV(dp));
+				}
+			}
+		}
+		error = dirremove(fndp);
+		if (!error) {
+			xp->i_nlink--;
+			xp->i_flag |= ICHG;
+		}
+		xp->i_flag &= ~IRENAME;
+	}
+	if (dp)
+		vput(ITOV(dp));
+	if (xp)
+		vput(ITOV(xp));
+	vrele(ITOV(ip));
+	return (error);
+
+bad:
+	if (xp)
+		vput(ITOV(xp));
+	vput(ITOV(dp));
+out:
+	ip->i_nlink--;
+	ip->i_flag |= ICHG;
+	vrele(ITOV(ip));
+	return (error);
+}
+
+/*
+ * A virgin directory (no blushing please).
+ */
+struct dirtemplate mastertemplate = {
+	0, 12, 1, ".",
+	0, DIRBLKSIZ - 12, 2, ".."
+};
+
+/*
+ * Mkdir system call
+ */
+ufs_mkdir(ndp, vap)
+	struct nameidata *ndp;
+	struct vattr *vap;
+{
+	register struct inode *ip, *dp;
+	struct inode *tip;
+	struct vnode *dvp;
+	struct dirtemplate dirtemplate;
+	int error;
+	int dmode;
+
+	dvp = ndp->ni_dvp;
+	dp = VTOI(dvp);
+	dmode = vap->va_mode&0777;
+	dmode |= IFDIR;
+	/*
+	 * Must simulate part of maknode here
+	 * in order to acquire the inode, but
+	 * not have it entered in the parent
+	 * directory.  The entry is made later
+	 * after writing "." and ".." entries out.
+	 */
+	if (error = ialloc(dp, dirpref(dp->i_fs), dmode, ndp->ni_cred, &tip)) {
+		iput(dp);
+		return (error);
+	}
+	ip = tip;
+	ip->i_uid = ndp->ni_cred->cr_uid;
+	ip->i_gid = dp->i_gid;
+#ifdef QUOTA
+	if ((error = getinoquota(ip)) ||
+	    (error = chkiq(ip, 1, ndp->ni_cred, 0))) {
+		ifree(ip, ip->i_number, dmode);
+		iput(ip);
+		iput(dp);
+		return (error);
+	}
+#endif
+	ip->i_flag |= IACC|IUPD|ICHG;
+	ip->i_mode = dmode;
+	ITOV(ip)->v_type = VDIR;	/* Rest init'd in iget() */
+	ip->i_nlink = 2;
+	error = iupdat(ip, &time, &time, 1);
+
+	/*
+	 * Bump link count in parent directory
+	 * to reflect work done below.  Should
+	 * be done before reference is created
+	 * so reparation is possible if we crash.
+	 */
+	dp->i_nlink++;
+	dp->i_flag |= ICHG;
+	error = iupdat(dp, &time, &time, 1);
+
+	/*
+	 * Initialize directory with "."
+	 * and ".." from static template.
+	 */
+	dirtemplate = mastertemplate;
+	dirtemplate.dot_ino = ip->i_number;
+	dirtemplate.dotdot_ino = dp->i_number;
+	error = vn_rdwr(UIO_WRITE, ITOV(ip), (caddr_t)&dirtemplate,
+		sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE,
+		IO_NODELOCKED|IO_SYNC, ndp->ni_cred, (int *)0);
+	if (error) {
+		dp->i_nlink--;
+		dp->i_flag |= ICHG;
+		goto bad;
+	}
+	if (DIRBLKSIZ > dp->i_fs->fs_fsize)
+		panic("mkdir: blksize");     /* XXX - should grow w/balloc() */
+	else
+		ip->i_size = DIRBLKSIZ;
+	/*
+	 * Directory all set up, now
+	 * install the entry for it in
+	 * the parent directory.
+	 */
+	error = direnter(ip, ndp);
+	dp = NULL;
+	if (error) {
+		ndp->ni_nameiop = LOOKUP | NOCACHE;
+		error = namei(ndp);
+		if (!error) {
+			dp = VTOI(ndp->ni_vp);
+			dp->i_nlink--;
+			dp->i_flag |= ICHG;
+		}
+	}
+bad:
+	/*
+	 * No need to do an explicit itrunc here,
+	 * vrele will do this for us because we set
+	 * the link count to 0.
+	 */
+	if (error) {
+		ip->i_nlink = 0;
+		ip->i_flag |= ICHG;
+		iput(ip);
+	} else
+		ndp->ni_vp = ITOV(ip);
+	if (dp)
+		iput(dp);
+	return (error);
+}
+
+/*
+ * Rmdir system call.
+ */
+ufs_rmdir(ndp)
+	register struct nameidata *ndp;
+{
+	register struct inode *ip, *dp;
+	int error = 0;
+
+	ip = VTOI(ndp->ni_vp);
+	dp = VTOI(ndp->ni_dvp);
+	/*
+	 * No rmdir "." please.
+	 */
+	if (dp == ip) {
+		vrele(ITOV(dp));
+		iput(ip);
+		return (EINVAL);
+	}
+	/*
+	 * Verify the directory is empty (and valid).
+	 * (Rmdir ".." won't be valid since
+	 *  ".." will contain a reference to
+	 *  the current directory and thus be
+	 *  non-empty.)
+	 */
+	if (ip->i_nlink != 2 || !dirempty(ip, dp->i_number, ndp->ni_cred)) {
+		error = ENOTEMPTY;
 		goto out;
-	(*bdevsw[major(dev)].d_open)(dev, !uap->ronly);
-	if(u.u_error)
+	}
+	/*
+	 * Delete reference to directory before purging
+	 * inode.  If we crash in between, the directory
+	 * will be reattached to lost+found,
+	 */
+	if (error = dirremove(ndp))
 		goto out;
-	bp = bread(dev, SUPERB);
-	if(u.u_error) {
-		brelse(bp);
-		goto out1;
-	}
-	mp->m_inodp = ip;
-	mp->m_dev = dev;
-	bp->b_flags |= B_LOCKED;
-	mp->m_bufp = bp;
-	fp = bp->b_un.b_filsys;
-	fp->s_ilock = 0;
-	fp->s_flock = 0;
-	fp->s_ronly = uap->ronly & 1;
-	fp->s_nbehind = 0;
-	fp->s_lasti = 1;
-	brelse(bp);
-	ip->i_flag |= IMOUNT;
-	prele(ip);
-	return;
-
+	dp->i_nlink--;
+	dp->i_flag |= ICHG;
+	cache_purge(ITOV(dp));
+	iput(dp);
+	ndp->ni_dvp = NULL;
+	/*
+	 * Truncate inode.  The only stuff left
+	 * in the directory is "." and "..".  The
+	 * "." reference is inconsequential since
+	 * we're quashing it.  The ".." reference
+	 * has already been adjusted above.  We've
+	 * removed the "." reference and the reference
+	 * in the parent directory, but there may be
+	 * other hard links so decrement by 2 and
+	 * worry about them later.
+	 */
+	ip->i_nlink -= 2;
+	error = itrunc(ip, (u_long)0, IO_SYNC);
+	cache_purge(ITOV(ip));
 out:
-	u.u_error = EBUSY;
-out1:
+	if (ndp->ni_dvp)
+		iput(dp);
 	iput(ip);
+	return (error);
 }
 
 /*
- * the umount system call.
+ * symlink -- make a symbolic link
  */
-sumount()
+ufs_symlink(ndp, vap, target)
+	struct nameidata *ndp;
+	struct vattr *vap;
+	char *target;
 {
-	dev_t dev;
-	register struct inode *ip;
-	register struct mount *mp;
-	struct buf *bp;
-	int stillopen, flag;
-	register struct a {
-		char	*fspec;
-	};
+	struct inode *ip;
+	int error;
 
-	dev = getmdev();
-	if(u.u_error)
-		return;
-	xumount(dev);	/* remove unused sticky files from text table */
-	update();
-	for(mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
-		if(mp->m_bufp != NULL && dev == mp->m_dev)
-			goto found;
-	u.u_error = EINVAL;
+	error = maknode(IFLNK | vap->va_mode, ndp, &ip);
+	if (error)
+		return (error);
+	error = vn_rdwr(UIO_WRITE, ITOV(ip), target, strlen(target), (off_t)0,
+		UIO_SYSSPACE, IO_NODELOCKED, ndp->ni_cred, (int *)0);
+	iput(ip);
+	return (error);
+}
+
+/*
+ * Vnode op for read and write
+ */
+ufs_readdir(vp, uio, cred, eofflagp)
+	struct vnode *vp;
+	register struct uio *uio;
+	struct ucred *cred;
+	int *eofflagp;
+{
+	int count, lost, error;
+
+	count = uio->uio_resid;
+	count &= ~(DIRBLKSIZ - 1);
+	lost = uio->uio_resid - count;
+	if (count < DIRBLKSIZ || (uio->uio_offset & (DIRBLKSIZ -1)))
+		return (EINVAL);
+	uio->uio_resid = count;
+	uio->uio_iov->iov_len = count;
+	error = ufs_read(vp, uio, 0, cred);
+	uio->uio_resid += lost;
+	if ((VTOI(vp)->i_size - uio->uio_offset) <= 0)
+		*eofflagp = 1;
+	else
+		*eofflagp = 0;
+	return (error);
+}
+
+/*
+ * Return target name of a symbolic link
+ */
+ufs_readlink(vp, uiop, cred)
+	struct vnode *vp;
+	struct uio *uiop;
+	struct ucred *cred;
+{
+
+	return (ufs_read(vp, uiop, 0, cred));
+}
+
+/*
+ * Ufs abort op, called after namei() when a CREATE/DELETE isn't actually
+ * done. Iff ni_vp/ni_dvp not null and locked, unlock.
+ */
+ufs_abortop(ndp)
+	register struct nameidata *ndp;
+{
+
+	if (ndp->ni_dvp) {
+		if (VOP_ISLOCKED(ndp->ni_dvp))
+			VOP_UNLOCK(ndp->ni_dvp);
+		vrele(ndp->ni_dvp);
+	}
+	if (ndp->ni_vp) {
+		if (VOP_ISLOCKED(ndp->ni_vp))
+			VOP_UNLOCK(ndp->ni_vp);
+		vrele(ndp->ni_vp);
+	}
 	return;
+}
 
-found:
-	for(ip = &inode[0]; ip < &inode[NINODE]; ip++)
-		if (ip->i_number != 0 && dev == ip->i_dev) {
-			u.u_error = EBUSY;
-			return;
-		} else if (ip->i_number != 0 && (ip->i_mode&IFMT) == IFBLK &&
-		    ip->i_un.i_rdev == dev)
-			stillopen++;
-	ip = mp->m_inodp;
-	ip->i_flag &= ~IMOUNT;
-	plock(ip);
-	iput(ip);
-	if ((bp = getblk(dev, SUPERB)) != mp->m_bufp)
-		panic("umount");
-	bp->b_flags &= ~B_LOCKED;
-	flag = !bp->b_un.b_filsys->s_ronly;
-	mp->m_bufp = NULL;
-	brelse(bp);
-	if (!stillopen) {
-		mpurge(mp - &mount[0]);
-		(*bdevsw[major(dev)].d_close)(dev, flag);
-		binval(dev);
+/*
+ * Lock an inode.
+ */
+ufs_lock(vp)
+	struct vnode *vp;
+{
+	register struct inode *ip = VTOI(vp);
+
+	ILOCK(ip);
+	return (0);
+}
+
+/*
+ * Unlock an inode.
+ */
+ufs_unlock(vp)
+	struct vnode *vp;
+{
+	register struct inode *ip = VTOI(vp);
+
+	if (!(ip->i_flag & ILOCKED))
+		panic("ufs_unlock NOT LOCKED");
+	IUNLOCK(ip);
+	return (0);
+}
+
+/*
+ * Check for a locked inode.
+ */
+ufs_islocked(vp)
+	struct vnode *vp;
+{
+
+	if (VTOI(vp)->i_flag & ILOCKED)
+		return (1);
+	return (0);
+}
+
+/*
+ * Get access to bmap
+ */
+ufs_bmap(vp, bn, vpp, bnp)
+	struct vnode *vp;
+	daddr_t bn;
+	struct vnode **vpp;
+	daddr_t *bnp;
+{
+	struct inode *ip = VTOI(vp);
+
+	if (vpp != NULL)
+		*vpp = ip->i_devvp;
+	if (bnp == NULL)
+		return (0);
+	return (bmap(ip, bn, bnp));
+}
+
+/*
+ * Calculate the logical to physical mapping if not done already,
+ * then call the device strategy routine.
+ */
+int checkoverlap = 0;
+
+ufs_strategy(bp)
+	register struct buf *bp;
+{
+	register struct inode *ip = VTOI(bp->b_vp);
+	struct vnode *vp;
+	int error;
+
+	if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR)
+		panic("ufs_strategy: spec");
+	if (bp->b_blkno == bp->b_lblkno) {
+		if (error = bmap(ip, bp->b_lblkno, &bp->b_blkno))
+			return (error);
+		if ((long)bp->b_blkno == -1)
+			clrbuf(bp);
+	}
+	if ((long)bp->b_blkno == -1) {
+		biodone(bp);
+		return (0);
+	}
+#ifdef DIAGNOSTIC
+	if (checkoverlap) {
+		register struct buf *ep;
+		struct buf *ebp;
+		daddr_t start, last;
+
+		ebp = &buf[nbuf];
+		start = bp->b_blkno;
+		last = start + btodb(bp->b_bcount) - 1;
+		for (ep = buf; ep < ebp; ep++) {
+			if (ep == bp || (ep->b_flags & B_INVAL) ||
+			    ep->b_vp == NULLVP)
+				continue;
+			if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0))
+				continue;
+			if (vp != ip->i_devvp)
+				continue;
+			/* look for overlap */
+			if (ep->b_bcount == 0 || ep->b_blkno > last ||
+			    ep->b_blkno + btodb(ep->b_bcount) <= start)
+				continue;
+			vprint("Disk overlap", vp);
+			printf("\tstart %d, end %d overlap start %d, end %d\n",
+				start, last, ep->b_blkno,
+				ep->b_blkno + btodb(ep->b_bcount) - 1);
+			panic("Disk buffer overlap");
+		}
 	}
+#endif /* DIAGNOSTIC */
+	vp = ip->i_devvp;
+	bp->b_dev = vp->v_rdev;
+	(*(vp->v_op->vn_strategy))(bp);
+	return (0);
+}
+
+/*
+ * Print out the contents of an inode.
+ */
+ufs_print(vp)
+	struct vnode *vp;
+{
+	register struct inode *ip = VTOI(vp);
+
+	printf("tag VT_UFS, ino %d, on dev %d, %d", ip->i_number,
+		major(ip->i_dev), minor(ip->i_dev));
+#ifdef FIFO
+	if (vp->v_type == VFIFO)
+		fifo_printinfo(vp);
+#endif /* FIFO */
+	printf("%s\n", (ip->i_flag & ILOCKED) ? " (LOCKED)" : "");
+	if (ip->i_spare0 == 0)
+		return;
+	printf("\towner pid %d", ip->i_spare0);
+	if (ip->i_spare1)
+		printf(" waiting pid %d", ip->i_spare1);
+	printf("\n");
 }
 
 /*
- * Common code for mount and umount.
- * Check that the user's argument is a reasonable
- * thing on which to mount, and return the device number if so.
+ * Read wrapper for special devices.
  */
-dev_t
-getmdev()
+ufsspec_read(vp, uio, ioflag, cred)
+	struct vnode *vp;
+	struct uio *uio;
+	int ioflag;
+	struct ucred *cred;
+{
+
+	/*
+	 * Set access flag.
+	 */
+	VTOI(vp)->i_flag |= IACC;
+	return (spec_read(vp, uio, ioflag, cred));
+}
+
+/*
+ * Write wrapper for special devices.
+ */
+ufsspec_write(vp, uio, ioflag, cred)
+	struct vnode *vp;
+	struct uio *uio;
+	int ioflag;
+	struct ucred *cred;
+{
+
+	/*
+	 * Set update and change flags.
+	 */
+	VTOI(vp)->i_flag |= IUPD|ICHG;
+	return (spec_write(vp, uio, ioflag, cred));
+}
+
+/*
+ * Close wrapper for special devices.
+ *
+ * Update the times on the inode then do device close.
+ */
+ufsspec_close(vp, fflag, cred)
+	struct vnode *vp;
+	int fflag;
+	struct ucred *cred;
+{
+	register struct inode *ip = VTOI(vp);
+
+	if (vp->v_usecount > 1 && !(ip->i_flag & ILOCKED))
+		ITIMES(ip, &time, &time);
+	return (spec_close(vp, fflag, cred));
+}
+
+#ifdef FIFO
+/*
+ * Read wrapper for fifo's
+ */
+ufsfifo_read(vp, uio, ioflag, cred)
+	struct vnode *vp;
+	struct uio *uio;
+	int ioflag;
+	struct ucred *cred;
+{
+
+	/*
+	 * Set access flag.
+	 */
+	VTOI(vp)->i_flag |= IACC;
+	return (fifo_read(vp, uio, ioflag, cred));
+}
+
+/*
+ * Write wrapper for fifo's.
+ */
+ufsfifo_write(vp, uio, ioflag, cred)
+	struct vnode *vp;
+	struct uio *uio;
+	int ioflag;
+	struct ucred *cred;
+{
+
+	/*
+	 * Set update and change flags.
+	 */
+	VTOI(vp)->i_flag |= IUPD|ICHG;
+	return (fifo_write(vp, uio, ioflag, cred));
+}
+
+/*
+ * Close wrapper for fifo's.
+ *
+ * Update the times on the inode then do device close.
+ */
+ufsfifo_close(vp, fflag, cred)
+	struct vnode *vp;
+	int fflag;
+	struct ucred *cred;
+{
+	register struct inode *ip = VTOI(vp);
+
+	if (vp->v_usecount > 1 && !(ip->i_flag & ILOCKED))
+		ITIMES(ip, &time, &time);
+	return (fifo_close(vp, fflag, cred));
+}
+#endif /* FIFO */
+
+/*
+ * Make a new file.
+ */
+maknode(mode, ndp, ipp)
+	int mode;
+	register struct nameidata *ndp;
+	struct inode **ipp;
 {
-	dev_t dev;
 	register struct inode *ip;
+	struct inode *tip;
+	register struct inode *pdir = VTOI(ndp->ni_dvp);
+	ino_t ipref;
+	int error;
+
+	*ipp = 0;
+	if ((mode & IFMT) == 0)
+		mode |= IFREG;
+	if ((mode & IFMT) == IFDIR)
+		ipref = dirpref(pdir->i_fs);
+	else
+		ipref = pdir->i_number;
+	if (error = ialloc(pdir, ipref, mode, ndp->ni_cred, &tip)) {
+		iput(pdir);
+		return (error);
+	}
+	ip = tip;
+	ip->i_uid = ndp->ni_cred->cr_uid;
+	ip->i_gid = pdir->i_gid;
+#ifdef QUOTA
+	if ((error = getinoquota(ip)) ||
+	    (error = chkiq(ip, 1, ndp->ni_cred, 0))) {
+		ifree(ip, ip->i_number, mode);
+		iput(ip);
+		iput(pdir);
+		return (error);
+	}
+#endif
+	ip->i_flag |= IACC|IUPD|ICHG;
+	ip->i_mode = mode;
+	ITOV(ip)->v_type = IFTOVT(mode);	/* Rest init'd in iget() */
+	ip->i_nlink = 1;
+	if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, ndp->ni_cred) &&
+	    suser(ndp->ni_cred, NULL))
+		ip->i_mode &= ~ISGID;
 
-	if (!suser())
-		return(NODEV);
-	ip = namei(uchar, 0);
-	if(ip == NULL)
-		return(NODEV);
-	if((ip->i_mode&IFMT) != IFBLK)
-		u.u_error = ENOTBLK;
-	dev = (dev_t)ip->i_un.i_rdev;
-	if(major(dev) >= nblkdev)
-		u.u_error = ENXIO;
+	/*
+	 * Make sure inode goes to disk before directory entry.
+	 */
+	if (error = iupdat(ip, &time, &time, 1))
+		goto bad;
+	if (error = direnter(ip, ndp)) {
+		pdir = NULL;
+		goto bad;
+	}
+	*ipp = ip;
+	return (0);
+
+bad:
+	/*
+	 * Write error occurred trying to update the inode
+	 * or the directory so must deallocate the inode.
+	 */
+	if (pdir)
+		iput(pdir);
+	ip->i_nlink = 0;
+	ip->i_flag |= ICHG;
 	iput(ip);
-	return(dev);
+	return (error);
 }