X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/0a34b6fd2e5f8cabcaff493bdd094820e32c21a4..a937f8567ba9375553a85507f18042a6faaffaab:/usr/src/sys/kern/vfs_vnops.c

diff --git a/usr/src/sys/kern/vfs_vnops.c b/usr/src/sys/kern/vfs_vnops.c
index f527bcc629..53f12b312a 100644
--- a/usr/src/sys/kern/vfs_vnops.c
+++ b/usr/src/sys/kern/vfs_vnops.c
@@ -1,290 +1,583 @@
-/*	vfs_vnops.c	4.6	%G%	*/
-
-#include "../h/param.h"
-#include "../h/systm.h"
-#include "../h/dir.h"
-#include "../h/user.h"
-#include "../h/filsys.h"
-#include "../h/file.h"
-#include "../h/conf.h"
-#include "../h/inode.h"
-#include "../h/reg.h"
-#include "../h/acct.h"
-#include "../h/mount.h"
+/*
+ * 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.
+ *
+ *	@(#)vfs_vnops.c	7.9 (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 "uio.h"
+#include "socket.h"
+#include "socketvar.h"
+#include "mount.h"
+#include "vnode.h"
+#include "../ufs/inode.h"
+#include "../ufs/fs.h"
+#include "../ufs/quota.h"
+#include "ioctl.h"
+#include "tty.h"
+
+int	vn_read(), vn_write(), vn_ioctl(), vn_select(), vn_close();
+struct 	fileops vnops =
+	{ vn_read, vn_write, vn_ioctl, vn_select, vn_close };
 
 /*
- * Convert a user supplied
- * file descriptor into a pointer
- * to a file structure.
- * Only task is to check range
- * of the descriptor.
+ * Common code for vnode open operations.
+ * Check permissions, and call the VOP_OPEN or VOP_CREATE routine.
  */
-struct file *
-getf(f)
-register int f;
+vn_open(ndp, fmode, cmode)
+	register struct nameidata *ndp;
+	int fmode, cmode;
 {
-	register struct file *fp;
+	register struct vnode *vp;
+	struct vattr vat;
+	struct vattr *vap = &vat;
+	int error;
 
-	if ((unsigned)f >= NOFILE || (fp = u.u_ofile[f]) == NULL) {
-		u.u_error = EBADF;
-		return (NULL);
+	if (fmode & FCREAT) {
+		ndp->ni_nameiop = CREATE | LOCKPARENT | LOCKLEAF;
+		if ((fmode & FEXCL) == 0)
+			ndp->ni_nameiop |= FOLLOW;
+		if (error = namei(ndp))
+			return (error);
+		if (ndp->ni_vp == NULL) {
+			vattr_null(vap);
+			vap->va_type = VREG;
+			vap->va_mode = cmode;
+			if (error = VOP_CREATE(ndp, vap))
+				return (error);
+			fmode &= ~FTRUNC;
+			vp = ndp->ni_vp;
+		} else {
+			vp = ndp->ni_vp;
+			ndp->ni_vp = 0;
+			VOP_ABORTOP(ndp);
+			ndp->ni_vp = vp;
+			if (fmode & FEXCL) {
+				error = EEXIST;
+				goto bad;
+			}
+			fmode &= ~FCREAT;
+		}
+	} else {
+		ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
+		if (error = namei(ndp))
+			return (error);
+		vp = ndp->ni_vp;
 	}
-#ifdef UCBIPC
-	if (u.u_pofile[f] & ISPORT) {
-		u.u_error = EISPORT;
-		return (NULL);
+	if (vp->v_type == VSOCK) {
+		error = EOPNOTSUPP;
+		goto bad;
 	}
-#endif
-	return (fp);
+	if ((fmode & FCREAT) == 0) {
+		if (fmode & FREAD) {
+			if (error = VOP_ACCESS(vp, VREAD, ndp->ni_cred))
+				goto bad;
+		}
+		if (fmode & (FWRITE|FTRUNC)) {
+			if (vp->v_type == VDIR) {
+				error = EISDIR;
+				goto bad;
+			}
+			if ((error = vn_writechk(vp)) ||
+			    (error = VOP_ACCESS(vp, VWRITE, ndp->ni_cred)))
+				goto bad;
+		}
+	}
+	if (fmode & FTRUNC) {
+		vattr_null(vap);
+		vap->va_size = 0;
+		if (error = VOP_SETATTR(vp, vap, ndp->ni_cred))
+			goto bad;
+	}
+	VOP_UNLOCK(vp);
+	if (setjmp(&u.u_qsave)) {
+		if (error == 0)
+			error = EINTR;
+		return (error);
+	}
+	error = VOP_OPEN(vp, fmode, ndp->ni_cred);
+	if (error)
+		vrele(vp);
+	return (error);
+
+bad:
+	vput(vp);
+	return(error);
 }
 
 /*
- * Internal form of close.
- * Decrement reference count on
- * file structure.
- * Also make sure the pipe protocol
- * does not constipate.
- *
- * Decrement reference count on the inode following
- * removal to the referencing file structure.
- * Call device handler on last close.
+ * 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.
  */
-closef(fp)
-register struct file *fp;
+vn_writechk(vp)
+	register struct vnode *vp;
 {
-	register struct inode *ip;
-	register struct mount *mp;
-	int flag, mode;
-	dev_t dev;
-	register int (*cfunc)();
 
-	if(fp == NULL)
-		return;
-	if (fp->f_count > 1) {
-		fp->f_count--;
-		return;
-	}
-	ip = fp->f_inode;
-	flag = fp->f_flag;
-	dev = (dev_t)ip->i_un.i_rdev;
-	mode = ip->i_mode & IFMT;
-
-	plock(ip);
-	fp->f_count = 0;
-	if(flag & FPIPE) {
-		ip->i_mode &= ~(IREAD|IWRITE);
-		wakeup((caddr_t)ip+1);
-		wakeup((caddr_t)ip+2);
-	}
-	iput(ip);
+	/*
+	 * 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->m_flag & M_RDONLY) && vp->v_type != VCHR &&
+	    vp->v_type != VBLK && vp->v_type != VSOCK)
+		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)
+		xrele(vp);
+	if (vp->v_flag & VTEXT)
+		return (ETXTBSY);
+	return (0);
+}
 
-	switch(mode) {
+/*
+ * Vnode version of rdwri() for calls on file systems.
+ */
+vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid)
+	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 uio auio;
+	struct iovec aiov;
+	int error;
 
-	case IFCHR:
-	case IFMPC:
-		cfunc = cdevsw[major(dev)].d_close;
-		break;
+	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;
+	if (rw == UIO_READ)
+		error = VOP_READ(vp, &auio, &offset, ioflg, cred);
+	else
+		error = VOP_WRITE(vp, &auio, &offset, ioflg, cred);
+	if (aresid)
+		*aresid = auio.uio_resid;
+	else
+		if (auio.uio_resid && error == 0)
+			error = EIO;
+	return (error);
+}
 
-	case IFBLK:
-		/*
-		 * We don't want to really close the device if it is mounted
-		 */
-		for (mp = mount; mp < &mount[NMOUNT]; mp++)
-			if (mp->m_bufp != NULL && mp->m_dev == dev)
-				return;
-	case IFMPB:
-		cfunc = bdevsw[major(dev)].d_close;
+vn_read(fp, uio, cred)
+	struct file *fp;
+	struct uio *uio;
+	struct ucred *cred;
+{
+
+	return (VOP_READ((struct vnode *)fp->f_data, uio, &(fp->f_offset),
+		(fp->f_flag & FNDELAY) ? IO_NDELAY : 0, cred));
+}
+
+vn_write(fp, uio, cred)
+	struct file *fp;
+	struct uio *uio;
+	struct ucred *cred;
+{
+	register struct vnode *vp = (struct vnode *)fp->f_data;
+	int ioflag = 0;
+
+	if (vp->v_type == VREG && (fp->f_flag & FAPPEND))
+		ioflag |= IO_APPEND;
+	if (fp->f_flag & FNDELAY)
+		ioflag |= IO_NDELAY;
+	return (VOP_WRITE(vp, uio, &(fp->f_offset), ioflag, cred));
+}
+
+/*
+ * Get stat info for a vnode.
+ */
+vn_stat(vp, sb)
+	struct vnode *vp;
+	register struct stat *sb;
+{
+	struct vattr vattr;
+	register struct vattr *vap;
+	int error;
+	u_short mode;
+
+	vap = &vattr;
+	error = VOP_GETATTR(vp, vap, u.u_cred);
+	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 |= IFREG;
+		break;
+	case VDIR:
+		mode |= IFDIR;
+		break;
+	case VBLK:
+		mode |= IFBLK;
+		break;
+	case VCHR:
+		mode |= IFCHR;
+		break;
+	case VLNK:
+		mode |= IFLNK;
+		break;
+	case VSOCK:
+		mode |= IFSOCK;
 		break;
 	default:
-		return;
-	}
-
-	if ((flag & FMP) == 0) {
-		for(fp=file; fp < fileNFILE; fp++)
-			if (fp->f_count && (ip=fp->f_inode)->i_un.i_rdev==dev &&
-			    (ip->i_mode&IFMT) == mode)
-				return;
-		if (mode == IFBLK) {
-			/*
-			 * on last close of a block device (that isn't mounted)
-			 * we must invalidate any in core blocks
-			 */
-			bflush(dev);
-			binval(dev);
-		}
-	}
-	(*cfunc)(dev, flag, fp);
+		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_atime = vap->va_atime.tv_sec;
+	sb->st_spare1 = 0;
+	sb->st_mtime = vap->va_mtime.tv_sec;
+	sb->st_spare2 = 0;
+	sb->st_ctime = vap->va_ctime.tv_sec;
+	sb->st_spare3 = 0;
+	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);
 }
 
 /*
- * openi called to allow handler
- * of special files to initialize and
- * validate before actual IO.
+ * Vnode ioctl call
  */
-openi(ip, rw)
-register struct inode *ip;
+vn_ioctl(fp, com, data)
+	struct file *fp;
+	int com;
+	caddr_t data;
 {
-	dev_t dev;
-	register unsigned int maj;
+	register struct vnode *vp = ((struct vnode *)fp->f_data);
+	struct vattr vattr;
+	int error;
 
-	dev = (dev_t)ip->i_un.i_rdev;
-	maj = major(dev);
-	switch(ip->i_mode&IFMT) {
+	switch (vp->v_type) {
 
-	case IFCHR:
-	case IFMPC:
-		if(maj >= nchrdev)
-			goto bad;
-		(*cdevsw[maj].d_open)(dev, rw);
-		break;
+	case VREG:
+	case VDIR:
+		if (com == FIONREAD) {
+			if (error = VOP_GETATTR(vp, &vattr, u.u_cred))
+				return (error);
+			*(off_t *)data = vattr.va_size - fp->f_offset;
+			return (0);
+		}
+		if (com == FIONBIO || com == FIOASYNC)	/* XXX */
+			return (0);			/* XXX */
+		/* fall into ... */
 
-	case IFBLK:
-	case IFMPB:
-		if(maj >= nblkdev)
-			goto bad;
-		(*bdevsw[maj].d_open)(dev, rw);
+	default:
+		return (ENOTTY);
+
+	case VCHR:
+	case VBLK:
+		u.u_r.r_val1 = 0;
+		if (setjmp(&u.u_qsave)) {
+			if ((u.u_sigintr & sigmask(u.u_procp->p_cursig)) != 0)
+				return(EINTR);
+			u.u_eosys = RESTARTSYS;
+			return (0);
+		}
+		return (VOP_IOCTL(vp, com, data, fp->f_flag, u.u_cred));
 	}
-	return;
+}
 
-bad:
-	u.u_error = ENXIO;
+/*
+ * Vnode select call
+ */
+vn_select(fp, which)
+	struct file *fp;
+	int which;
+{
+	return(VOP_SELECT(((struct vnode *)fp->f_data), which, u.u_cred));
+}
+
+/*
+ * Vnode close call
+ */
+vn_close(fp)
+	register struct file *fp;
+{
+	struct vnode *vp = ((struct vnode *)fp->f_data);
+	int error;
+
+	if (fp->f_flag & (FSHLOCK|FEXLOCK))
+		vn_unlock(fp, FSHLOCK|FEXLOCK);
+	/*
+	 * Must delete vnode reference from this file entry
+	 * before VOP_CLOSE, so that only other references
+	 * will prevent close.
+	 */
+	fp->f_data = (caddr_t) 0;
+	error = VOP_CLOSE(vp, fp->f_flag, u.u_cred);
+	vrele(vp);
+	return (error);
 }
 
 /*
- * Check mode permission on inode pointer.
- * Mode is READ, WRITE or EXEC.
- * In the case of WRITE, the
- * read-only status of the file
- * system is checked.
- * Also in WRITE, prototype text
- * segments cannot be written.
- * The mode is shifted to select
- * the owner/group/other fields.
- * The super user is granted all
- * permissions.
+ * Place an advisory lock on a vnode.
+ * !! THIS IMPLIES THAT ALL STATEFUL FILE SERVERS WILL USE file table entries
  */
-access(ip, mode)
-register struct inode *ip;
+vn_lock(fp, cmd)
+	register struct file *fp;
+	int cmd;
 {
-	register m;
+	register int priority = PLOCK;
+	register struct vnode *vp = (struct vnode *)fp->f_data;
 
-	m = mode;
-	if(m == IWRITE) {
-		if(getfs(ip->i_dev)->s_ronly != 0) {
-			u.u_error = EROFS;
-			return(1);
+	if ((cmd & LOCK_EX) == 0)
+		priority += 4;
+	if (setjmp(&u.u_qsave)) {
+		if ((u.u_sigintr & sigmask(u.u_procp->p_cursig)) != 0)
+			return(EINTR);
+		u.u_eosys = RESTARTSYS;
+		return (0);
+	}
+	/*
+	 * If there's a exclusive lock currently applied
+	 * to the file, then we've gotta wait for the
+	 * lock with everyone else.
+	 */
+again:
+	while (vp->v_flag & VEXLOCK) {
+		/*
+		 * If we're holding an exclusive
+		 * lock, then release it.
+		 */
+		if (fp->f_flag & FEXLOCK) {
+			vn_unlock(fp, FEXLOCK);
+			continue;
 		}
-		if (ip->i_flag&ITEXT)		/* try to free text */
-			xrele(ip);
-		if(ip->i_flag & ITEXT) {
-			u.u_error = ETXTBSY;
-			return(1);
+		if (cmd & LOCK_NB)
+			return (EWOULDBLOCK);
+		vp->v_flag |= VLWAIT;
+		sleep((caddr_t)&vp->v_exlockc, priority);
+	}
+	if ((cmd & LOCK_EX) && (vp->v_flag & VSHLOCK)) {
+		/*
+		 * Must wait for any shared locks to finish
+		 * before we try to apply a exclusive lock.
+		 *
+		 * If we're holding a shared
+		 * lock, then release it.
+		 */
+		if (fp->f_flag & FSHLOCK) {
+			vn_unlock(fp, FSHLOCK);
+			goto again;
 		}
+		if (cmd & LOCK_NB)
+			return (EWOULDBLOCK);
+		vp->v_flag |= VLWAIT;
+		sleep((caddr_t)&vp->v_shlockc, PLOCK);
+		goto again;
 	}
-	if(u.u_uid == 0)
-		return(0);
-	if(u.u_uid != ip->i_uid) {
-		m >>= 3;
-		if(u.u_gid != ip->i_gid)
-			m >>= 3;
+	if (fp->f_flag & FEXLOCK)
+		panic("vn_lock");
+	if (cmd & LOCK_EX) {
+		cmd &= ~LOCK_SH;
+		vp->v_exlockc++;
+		vp->v_flag |= VEXLOCK;
+		fp->f_flag |= FEXLOCK;
 	}
-	if((ip->i_mode&m) != 0)
-		return(0);
+	if ((cmd & LOCK_SH) && (fp->f_flag & FSHLOCK) == 0) {
+		vp->v_shlockc++;
+		vp->v_flag |= VSHLOCK;
+		fp->f_flag |= FSHLOCK;
+	}
+	return (0);
+}
+
+/*
+ * Unlock a file.
+ */
+vn_unlock(fp, kind)
+	register struct file *fp;
+	int kind;
+{
+	register struct vnode *vp = (struct vnode *)fp->f_data;
+	int flags;
 
-	u.u_error = EACCES;
-	return(1);
+	kind &= fp->f_flag;
+	if (vp == NULL || kind == 0)
+		return;
+	flags = vp->v_flag;
+	if (kind & FSHLOCK) {
+		if ((flags & VSHLOCK) == 0)
+			panic("vn_unlock: SHLOCK");
+		if (--vp->v_shlockc == 0) {
+			vp->v_flag &= ~VSHLOCK;
+			if (flags & VLWAIT)
+				wakeup((caddr_t)&vp->v_shlockc);
+		}
+		fp->f_flag &= ~FSHLOCK;
+	}
+	if (kind & FEXLOCK) {
+		if ((flags & VEXLOCK) == 0)
+			panic("vn_unlock: EXLOCK");
+		if (--vp->v_exlockc == 0) {
+			vp->v_flag &= ~(VEXLOCK|VLWAIT);
+			if (flags & VLWAIT)
+				wakeup((caddr_t)&vp->v_exlockc);
+		}
+		fp->f_flag &= ~FEXLOCK;
+	}
 }
 
 /*
- * Look up a pathname and test if
- * the resultant inode is owned by the
- * current user.
- * If not, try for super-user.
- * If permission is granted,
- * return inode pointer.
+ * vn_fhtovp() - convert a fh to a vnode ptr (optionally locked)
+ * 	- look up fsid in mount list (if not found ret error)
+ *	- get vp by calling VFS_FHTOVP() macro
+ *	- if lockflag lock it with VOP_LOCK()
  */
-struct inode *
-owner()
+vn_fhtovp(fhp, lockflag, vpp)
+	fhandle_t *fhp;
+	int lockflag;
+	struct vnode **vpp;
 {
-	register struct inode *ip;
-
-	ip = namei(uchar, 0);
-	if(ip == NULL)
-		return(NULL);
-	if(u.u_uid == ip->i_uid)
-		return(ip);
-	if(suser())
-		return(ip);
-	iput(ip);
-	return(NULL);
+	register struct mount *mp;
+	int error;
+
+	if ((mp = getvfs(&fhp->fh_fsid)) == NULL)
+		return (ESTALE);
+	if (VFS_FHTOVP(mp, &fhp->fh_fid, vpp))
+		return (ESTALE);
+	if (!lockflag)
+		VOP_UNLOCK(*vpp);
+	return (0);
 }
 
 /*
- * Test if the current user is the
- * super user.
+ * Revoke access the current tty by all processes.
+ * Used only by the super-user in init
+ * to give ``clean'' terminals at login.
  */
-suser()
+vhangup()
 {
 
-	if(u.u_uid == 0) {
-		u.u_acflag |= ASU;
-		return(1);
+	if (u.u_error = suser(u.u_cred, &u.u_acflag))
+		return;
+	if (u.u_ttyp == NULL)
+		return;
+	forceclose(u.u_ttyd);
+	if ((u.u_ttyp->t_state) & TS_ISOPEN)
+		gsignal(u.u_ttyp->t_pgid, SIGHUP);
+	u.u_ttyp->t_session = 0;
+	u.u_ttyp->t_pgid = 0;
+}
+
+forceclose(dev)
+	dev_t dev;
+{
+	register struct file *fp;
+	register struct vnode *vp;
+
+	for (fp = file; fp < fileNFILE; fp++) {
+		if (fp->f_count == 0)
+			continue;
+		if (fp->f_type != DTYPE_VNODE)
+			continue;
+		vp = (struct vnode *)fp->f_data;
+		if (vp == 0)
+			continue;
+		if (vp->v_type != VCHR)
+			continue;
+		if (vp->v_rdev != dev)
+			continue;
+		fp->f_flag &= ~(FREAD|FWRITE);
 	}
-	u.u_error = EPERM;
-	return(0);
 }
 
 /*
- * Allocate a user file descriptor.
+ * Vnode reference, just increment the count
  */
-ufalloc()
+void vref(vp)
+	struct vnode *vp;
 {
-	register i;
 
-	for(i=0; i<NOFILE; i++)
-		if(u.u_ofile[i] == NULL) {
-			u.u_r.r_val1 = i;
-			u.u_pofile[i] = 0;
-			return(i);
-		}
-	u.u_error = EMFILE;
-	return(-1);
+	vp->v_count++;
 }
 
-struct	file *lastf;
 /*
- * Allocate a user file descriptor
- * and a file structure.
- * Initialize the descriptor
- * to point at the file structure.
- *
- * no file -- if there are no available
- * 	file structures.
+ * Vnode release, just decrement the count and call VOP_INACTIVE()
  */
-struct file *
-falloc()
+void vrele(vp)
+	register struct vnode *vp;
 {
-	register struct file *fp;
-	register i;
-
-	i = ufalloc();
-	if (i < 0)
-		return(NULL);
-	if (lastf == 0)
-		lastf = file;
-	for (fp = lastf; fp < fileNFILE; fp++)
-		if (fp->f_count == 0)
-			goto slot;
-	for (fp = file; fp < lastf; fp++)
-		if (fp->f_count == 0)
-			goto slot;
-	printf("no file\n");
-	u.u_error = ENFILE;
-	return (NULL);
-slot:
-	u.u_ofile[i] = fp;
-	fp->f_count++;
-	fp->f_un.f_offset = 0;
-	lastf = fp + 1;
-	return (fp);
+
+	if (vp == NULL)
+		return;
+	vp->v_count--;
+	if (vp->v_count < 0)
+		printf("inode %d, bad ref count %d\n",
+			VTOI(vp)->i_number, vp->v_count);
+	if (vp->v_count == 0)
+		VOP_INACTIVE(vp);
+}
+
+/*
+ * vput(), just unlock and vrele()
+ */
+vput(vp)
+	register struct vnode *vp;
+{
+	VOP_UNLOCK(vp);
+	vrele(vp);
+}
+
+/*
+ * Noop
+ */
+vfs_noop()
+{
+
+	return (ENXIO);
+}
+
+/*
+ * Null op
+ */
+vfs_nullop()
+{
+
+	return (0);
 }