text: /*
   *             Coda: an Experimental Distributed File System
   *                              Release 3.1
   * 
   *           Copyright (c) 1987-1998 Carnegie Mellon University
   *                          All Rights Reserved
   * 
   * Permission  to  use, copy, modify and distribute this software and its
   * documentation is hereby granted,  provided  that  both  the  copyright
   * notice  and  this  permission  notice  appear  in  all  copies  of the
   * software, derivative works or  modified  versions,  and  any  portions
   * thereof, and that both notices appear in supporting documentation, and
   * that credit is given to Carnegie Mellon University  in  all  documents
   * and publicity pertaining to direct or indirect use of this code or its
   * derivatives.
   * 
   * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS  KNOWN  TO  HAVE  BUGS,
   * SOME  OF  WHICH MAY HAVE SERIOUS CONSEQUENCES.  CARNEGIE MELLON ALLOWS
   * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION.   CARNEGIE  MELLON
   * DISCLAIMS  ANY  LIABILITY  OF  ANY  KIND  FOR  ANY  DAMAGES WHATSOEVER
   * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE  OR  OF
   * ANY DERIVATIVE WORK.
   * 
   * Carnegie  Mellon  encourages  users  of  this  software  to return any
   * improvements or extensions that  they  make,  and  to  grant  Carnegie
   * Mellon the rights to redistribute these changes without encumbrance.
   * 
   *  	@(#) src/sys/coda/coda_vnops.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
   */
  /* 
   * Mach Operating System
   * Copyright (c) 1990 Carnegie-Mellon University
   * Copyright (c) 1989 Carnegie-Mellon University
   * All rights reserved.  The CMU software License Agreement specifies
   * the terms and conditions for use and redistribution.
   */
  
  /*
   * This code was written for the Coda filesystem at Carnegie Mellon
   * University.  Contributers include David Steere, James Kistler, and
   * M. Satyanarayanan.  
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: src/sys/coda/coda_vnops.c,v 1.51 2003/09/07 07:43:09 tjr Exp $");
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/acct.h>
  #include <sys/errno.h>
  #include <sys/fcntl.h>
  #include <sys/kernel.h>
  #include <sys/lock.h>
  #include <sys/malloc.h>
  #include <sys/file.h>		/* Must come after sys/malloc.h */
  #include <sys/mount.h>
  #include <sys/mutex.h>
  #include <sys/namei.h>
  #include <sys/proc.h>
  #include <sys/uio.h>
  #include <sys/unistd.h>
  
  #include <vm/vm.h>
  #include <vm/vm_object.h>
  #include <vm/vm_extern.h>
  
  #include <coda/coda.h>
  #include <coda/cnode.h>
  #include <coda/coda_vnops.h>
  #include <coda/coda_venus.h>
  #include <coda/coda_opstats.h>
  #include <coda/coda_subr.h>
  #include <coda/coda_namecache.h>
  #include <coda/coda_pioctl.h>
  
  /* 
   * These flags select various performance enhancements.
   */
  int coda_attr_cache  = 1;       /* Set to cache attributes in the kernel */
  int coda_symlink_cache = 1;     /* Set to cache symbolic link information */
  int coda_access_cache = 1;      /* Set to handle some access checks directly */
  
  /* structure to keep track of vfs calls */
  
  struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE];
  
  #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++)
  #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++)
  #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++)
  #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++)
  
  /* What we are delaying for in printf */
  int coda_printf_delay = 0;  /* in microseconds */
  int coda_vnop_print_entry = 0;
  static int coda_lockdebug = 0;
  
  /* Definition of the vfs operation vector */
  static int (**coda_vnodeop_p)(void *);
  
  /*
   * Some NetBSD details:
   * 
   *   coda_start is called at the end of the mount syscall.
   *   coda_init is called at boot time.
   */
  
  #define ENTRY  if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__))
  
  /* Definition of the vnode operation vector */
  
  struct vnodeopv_entry_desc coda_vnodeop_entries[] = {
      { &vop_default_desc, coda_vop_error },
      { &vop_lookup_desc, coda_lookup },		/* lookup */
      { &vop_create_desc, coda_create },		/* create */
      { &vop_mknod_desc, coda_vop_error },	/* mknod */
      { &vop_open_desc, coda_open },		/* open */
      { &vop_close_desc, coda_close },		/* close */
      { &vop_access_desc, coda_access },		/* access */
      { &vop_getattr_desc, coda_getattr },	/* getattr */
      { &vop_setattr_desc, coda_setattr },	/* setattr */
      { &vop_read_desc, coda_read },		/* read */
      { &vop_write_desc, coda_write },		/* write */
      { &vop_ioctl_desc, coda_ioctl },		/* ioctl */
      { &vop_fsync_desc, coda_fsync },		/* fsync */
      { &vop_remove_desc, coda_remove },		/* remove */
      { &vop_link_desc, coda_link },		/* link */
      { &vop_rename_desc, coda_rename },		/* rename */
      { &vop_mkdir_desc, coda_mkdir },		/* mkdir */
      { &vop_rmdir_desc, coda_rmdir },		/* rmdir */
      { &vop_symlink_desc, coda_symlink },	/* symlink */
      { &vop_readdir_desc, coda_readdir },	/* readdir */
      { &vop_readlink_desc, coda_readlink },	/* readlink */
      { &vop_inactive_desc, coda_inactive },	/* inactive */
      { &vop_reclaim_desc, coda_reclaim },	/* reclaim */
      { &vop_lock_desc, coda_lock },		/* lock */
      { &vop_unlock_desc, coda_unlock },		/* unlock */
      { &vop_bmap_desc, coda_bmap },		/* bmap */
      { &vop_print_desc, coda_vop_error },	/* print */
      { &vop_islocked_desc, coda_islocked },	/* islocked */
      { &vop_pathconf_desc, coda_pathconf },	/* pathconf */
      { &vop_advlock_desc, coda_vop_nop },	/* advlock */
      { &vop_lease_desc, coda_vop_nop },		/* lease */
      { &vop_poll_desc, (vop_t *) vop_stdpoll },
      { &vop_getpages_desc, (vop_t*)vop_stdgetpages },	/* pager intf.*/
      { &vop_putpages_desc, (vop_t*)vop_stdputpages },	/* pager intf.*/
      { &vop_createvobject_desc, (vop_t*)vop_stdcreatevobject },
      { &vop_destroyvobject_desc, (vop_t*)vop_stddestroyvobject },
      { &vop_getvobject_desc, (vop_t*)vop_stdgetvobject },
  
  #if	0
  
      we need to define these someday
  #define UFS_BLKATOFF(aa, bb, cc, dd) VFSTOUFS((aa)->v_mount)->um_blkatoff(aa, bb, cc, dd)
  #define UFS_VALLOC(aa, bb, cc, dd) VFSTOUFS((aa)->v_mount)->um_valloc(aa, bb, cc, dd)
  #define UFS_VFREE(aa, bb, cc) VFSTOUFS((aa)->v_mount)->um_vfree(aa, bb, cc)
  #define UFS_TRUNCATE(aa, bb, cc, dd, ee) VFSTOUFS((aa)->v_mount)->um_truncate(aa, bb, cc, dd, ee)
  #define UFS_UPDATE(aa, bb) VFSTOUFS((aa)->v_mount)->um_update(aa, bb)
  
      missing
      { &vop_reallocblks_desc,	(vop_t *) ufs_missingop },
      { &vop_cachedlookup_desc,	(vop_t *) ufs_lookup },
      { &vop_whiteout_desc,	(vop_t *) ufs_whiteout },
  #endif
  
      { &vop_createvobject_desc,	(vop_t *) vop_stdcreatevobject },
      { &vop_destroyvobject_desc,	(vop_t *) vop_stddestroyvobject },
      { &vop_getvobject_desc,     (vop_t *) vop_stdgetvobject },	
      { &vop_getwritemount_desc,	(vop_t *) vop_stdgetwritemount },
      { (struct vnodeop_desc*)NULL, (int(*)(void *))NULL }
  };
  
  static struct vnodeopv_desc coda_vnodeop_opv_desc =
  		{ &coda_vnodeop_p, coda_vnodeop_entries };
  
  VNODEOP_SET(coda_vnodeop_opv_desc);
  
  /* A generic panic: we were called with something we didn't define yet */
  int
  coda_vop_error(void *anon) {
      struct vnodeop_desc **desc = (struct vnodeop_desc **)anon;
  
      myprintf(("coda_vop_error: Vnode operation %s called, but not defined.\n",
  	      (*desc)->vdesc_name));
      /*
      panic("coda_vop_error");
      */
      return EIO;
  }
  
  /* A generic do-nothing.  For lease_check, advlock */
  int
  coda_vop_nop(void *anon) {
      struct vnodeop_desc **desc = (struct vnodeop_desc **)anon;
  
      if (codadebug) {
  	myprintf(("Vnode operation %s called, but unsupported\n",
  		  (*desc)->vdesc_name));
      } 
     return (0);
  }
  
  int
  coda_vnodeopstats_init(void)
  {
  	register int i;
  	
  	for(i=0;i<CODA_VNODEOPS_SIZE;i++) {
  		coda_vnodeopstats[i].opcode = i;
  		coda_vnodeopstats[i].entries = 0;
  		coda_vnodeopstats[i].sat_intrn = 0;
  		coda_vnodeopstats[i].unsat_intrn = 0;
  		coda_vnodeopstats[i].gen_intrn = 0;
  	}
  	return 0;
  }
  		
  /* 
   * coda_open calls Venus to return the device, inode pair of the cache
   * file holding the data. Using iget, coda_open finds the vnode of the
   * cache file, and then opens it.
   */
  int
  coda_open(v)
      void *v;
  {
      /* 
       * NetBSD can pass the O_EXCL flag in mode, even though the check
       * has already happened.  Venus defensively assumes that if open
       * is passed the EXCL, it must be a bug.  We strip the flag here.
       */
  /* true args */
      struct vop_open_args *ap = v;
      register struct vnode **vpp = &(ap->a_vp);
      struct cnode *cp = VTOC(*vpp);
      int flag = ap->a_mode & (~O_EXCL);
      struct ucred *cred = ap->a_cred;
      struct thread *td = ap->a_td;
  /* locals */
      int error;
      struct vnode *vp;
      dev_t dev;
      ino_t inode;
  
      MARK_ENTRY(CODA_OPEN_STATS);
  
      /* Check for open of control file. */
      if (IS_CTL_VP(*vpp)) {
  	/* XXX */
  	/* if (WRITEABLE(flag)) */ 
  	if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) {
  	    MARK_INT_FAIL(CODA_OPEN_STATS);
  	    return(EACCES);
  	}
  	MARK_INT_SAT(CODA_OPEN_STATS);
  	return(0);
      }
  
      error = venus_open(vtomi((*vpp)), &cp->c_fid, flag, cred, td->td_proc, &dev, &inode);
      if (error)
  	return (error);
      if (!error) {
  	CODADEBUG( CODA_OPEN,myprintf(("open: dev %#lx inode %lu result %d\n",
  				       (u_long)dev2udev(dev), (u_long)inode,
  				       error)); )
      }
  
      /* Translate the <device, inode> pair for the cache file into
         an inode pointer. */
      error = coda_grab_vnode(dev, inode, &vp);
      if (error)
  	return (error);
  
      /* We get the vnode back locked.  Needs unlocked */
      VOP_UNLOCK(vp, 0, td);
      /* Keep a reference until the close comes in. */
      vref(*vpp);                
  
      /* Save the vnode pointer for the cache file. */
      if (cp->c_ovp == NULL) {
  	cp->c_ovp = vp;
      } else {
  	if (cp->c_ovp != vp)
  	    panic("coda_open:  cp->c_ovp != ITOV(ip)");
      }
      cp->c_ocount++;
  
      /* Flush the attribute cached if writing the file. */
      if (flag & FWRITE) {
  	cp->c_owrite++;
  	cp->c_flags &= ~C_VATTR;
      }
  
      /* Save the <device, inode> pair for the cache file to speed
         up subsequent page_read's. */
      cp->c_device = dev;
      cp->c_inode = inode;
  
      /* Open the cache file. */
      error = VOP_OPEN(vp, flag, cred, td, -1); 
      if (error) {
      	printf("coda_open: VOP_OPEN on container failed %d\n", error);
  	return (error);
      }
  /* grab (above) does this when it calls newvnode unless it's in the cache*/
      if (vp->v_type == VREG) {
      	error = vfs_object_create(vp, td, cred);
  	if (error != 0) {
  	    printf("coda_open: vfs_object_create() returns %d\n", error);
  	    vput(vp);
  	}
      }
  
      return(error);
  }
  
  /*
   * Close the cache file used for I/O and notify Venus.
   */
  int
  coda_close(v)
      void *v;
  {
  /* true args */
      struct vop_close_args *ap = v;
      struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
      int flag = ap->a_fflag;
      struct ucred *cred = ap->a_cred;
      struct thread *td = ap->a_td;
  /* locals */
      int error;
  
      MARK_ENTRY(CODA_CLOSE_STATS);
  
      /* Check for close of control file. */
      if (IS_CTL_VP(vp)) {
  	MARK_INT_SAT(CODA_CLOSE_STATS);
  	return(0);
      }
  
      if (IS_UNMOUNTING(cp)) {
  	if (cp->c_ovp) {
  #ifdef	CODA_VERBOSE
  	    printf("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n",
  		    vrefcnt(vp), cp->c_ovp, vp, cp);
  #endif
  #ifdef	hmm
  	    vgone(cp->c_ovp);
  #else
  	    VOP_CLOSE(cp->c_ovp, flag, cred, td); /* Do errors matter here? */
  	    vrele(cp->c_ovp);
  #endif
  	} else {
  #ifdef	CODA_VERBOSE
  	    printf("coda_close: NO container vp %p/cp %p\n", vp, cp);
  #endif
  	}
  	return ENODEV;
      } else {
  	VOP_CLOSE(cp->c_ovp, flag, cred, td); /* Do errors matter here? */
  	vrele(cp->c_ovp);
      }
  
      if (--cp->c_ocount == 0)
  	cp->c_ovp = NULL;
  
      if (flag & FWRITE)                    /* file was opened for write */
  	--cp->c_owrite;
  
      error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, td->td_proc);
      vrele(CTOV(cp));
  
      CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); )
      return(error);
  }
  
  int
  coda_read(v)
      void *v;
  {
      struct vop_read_args *ap = v;
  
      ENTRY;
      return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ,
  		    ap->a_ioflag, ap->a_cred, ap->a_uio->uio_td));
  }
  
  int
  coda_write(v)
      void *v;
  {
      struct vop_write_args *ap = v;
  
      ENTRY;
      return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE,
  		    ap->a_ioflag, ap->a_cred, ap->a_uio->uio_td));
  }
  
  int
  coda_rdwr(vp, uiop, rw, ioflag, cred, td)
      struct vnode *vp;
      struct uio *uiop;
      enum uio_rw rw;
      int ioflag;
      struct ucred *cred;
      struct thread *td;
  { 
  /* upcall decl */
    /* NOTE: container file operation!!! */
  /* locals */
      struct cnode *cp = VTOC(vp);
      struct vnode *cfvp = cp->c_ovp;
      struct proc *p = td->td_proc;
      struct thread *ltd = td;
      int igot_internally = 0;
      int opened_internally = 0;
      int error = 0;
      int iscore = 0;
  
      MARK_ENTRY(CODA_RDWR_STATS);
  
      CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %d, %lld, %d)\n", rw, 
  			      (void *)uiop->uio_iov->iov_base, uiop->uio_resid, 
  			      (long long)uiop->uio_offset, uiop->uio_segflg)); )
  	
      /* Check for rdwr of control object. */
      if (IS_CTL_VP(vp)) {
  	MARK_INT_FAIL(CODA_RDWR_STATS);
  	return(EINVAL);
      }
  
      /* 
       * If file is not already open this must be a page
       * {read,write} request.  Iget the cache file's inode
       * pointer if we still have its <device, inode> pair.
       * Otherwise, we must do an internal open to derive the
       * pair. 
       */
      if (cfvp == NULL) {
  	/* 
  	 * If we're dumping core, do the internal open. Otherwise
  	 * venus won't have the correct size of the core when
  	 * it's completely written.
  	 */
  	if (p) {
  	    PROC_LOCK(p);
  	    iscore = (p->p_acflag & ACORE);
  	    PROC_UNLOCK(p);
  	}
  	else
  	    ltd = curthread; 
  
  	if (cp->c_inode != 0 && !iscore) {
  	    igot_internally = 1;
  	    error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp);
  	    if (error) {
  		MARK_INT_FAIL(CODA_RDWR_STATS);
  		return(error);
  	    }
  	    /* 
  	     * We get the vnode back locked by curthread in both Mach and
  	     * NetBSD.  Needs unlocked 
  	     */
  	    VOP_UNLOCK(cfvp, 0, ltd);
  	}
  	else {
  	    opened_internally = 1;
  	    MARK_INT_GEN(CODA_OPEN_STATS);
  	    error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), 
  			     cred, td, -1);
  printf("coda_rdwr: Internally Opening %p\n", vp);
  	    if (error) {
  		printf("coda_rdwr: VOP_OPEN on container failed %d\n", error);
  		return (error);
  	    }
  	    if (vp->v_type == VREG) {
  		error = vfs_object_create(vp, td, cred);
  		if (error != 0) {
  		    printf("coda_rdwr: vfs_object_create() returns %d\n", error);
  		    vput(vp);
  		}
  	    }
  	    if (error) {
  		MARK_INT_FAIL(CODA_RDWR_STATS);
  		return(error);
  	    }
  	    cfvp = cp->c_ovp;
  	}
      }
  
      /* Have UFS handle the call. */
      CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = %d\n",
  			     coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); )
      if (rw == UIO_READ) {
  	error = VOP_READ(cfvp, uiop, ioflag, cred);
      } else {
  	error = VOP_WRITE(cfvp, uiop, ioflag, cred);
  	/* ufs_write updates the vnode_pager_setsize for the vnode/object */
  
  	{   struct vattr attr;
  
  	    if (VOP_GETATTR(cfvp, &attr, cred, td) == 0) {
  		vnode_pager_setsize(vp, attr.va_size);
  	    }
  	}
      }
  
      if (error)
  	MARK_INT_FAIL(CODA_RDWR_STATS);
      else
  	MARK_INT_SAT(CODA_RDWR_STATS);
  
      /* Do an internal close if necessary. */
      if (opened_internally) {
  	MARK_INT_GEN(CODA_CLOSE_STATS);
  	(void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred, td);
      }
  
      /* Invalidate cached attributes if writing. */
      if (rw == UIO_WRITE)
  	cp->c_flags &= ~C_VATTR;
      return(error);
  }
  
  
  
  int
  coda_ioctl(v)
      void *v;
  {
  /* true args */
      struct vop_ioctl_args *ap = v;
      struct vnode *vp = ap->a_vp;
      int com = ap->a_command;
      caddr_t data = ap->a_data;
      int flag = ap->a_fflag;
      struct ucred *cred = ap->a_cred;
      struct thread *td = ap->a_td;
  /* locals */
      int error;
      struct vnode *tvp;
      struct nameidata ndp;
      struct PioctlData *iap = (struct PioctlData *)data;
  
      MARK_ENTRY(CODA_IOCTL_STATS);
  
      CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));)
  	
      /* Don't check for operation on a dying object, for ctlvp it
         shouldn't matter */
  	
      /* Must be control object to succeed. */
      if (!IS_CTL_VP(vp)) {
  	MARK_INT_FAIL(CODA_IOCTL_STATS);
  	CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != ctlvp"));)
  	    return (EOPNOTSUPP);
      }
      /* Look up the pathname. */
  
      /* Should we use the name cache here? It would get it from
         lookupname sooner or later anyway, right? */
  
      NDINIT(&ndp, LOOKUP, (iap->follow ? FOLLOW : NOFOLLOW), UIO_USERSPACE, iap->path, td);
      error = namei(&ndp);
      tvp = ndp.ni_vp;
  
      if (error) {
  	MARK_INT_FAIL(CODA_IOCTL_STATS);
  	CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup returns %d\n",
  				   error));)
  	return(error);
      }
  
      /* 
       * Make sure this is a coda style cnode, but it may be a
       * different vfsp 
       */
      if (tvp->v_op != coda_vnodeop_p) {
  	vrele(tvp);
  	NDFREE(&ndp, NDF_ONLY_PNBUF);
  	MARK_INT_FAIL(CODA_IOCTL_STATS);
  	CODADEBUG(CODA_IOCTL, 
  		 myprintf(("coda_ioctl error: %s not a coda object\n", 
  			iap->path));)
  	return(EINVAL);
      }
  
      if (iap->vi.in_size > VC_MAXDATASIZE) {
  	NDFREE(&ndp, 0);
  	return(EINVAL);
      }
      error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, cred, td->td_proc);
  
      if (error)
  	MARK_INT_FAIL(CODA_IOCTL_STATS);
      else
  	CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); )
  
      vrele(tvp);
      NDFREE(&ndp, NDF_ONLY_PNBUF);
      return(error);
  }
  
  /*
   * To reduce the cost of a user-level venus;we cache attributes in
   * the kernel.  Each cnode has storage allocated for an attribute. If
   * c_vattr is valid, return a reference to it. Otherwise, get the
   * attributes from venus and store them in the cnode.  There is some
   * question if this method is a security leak. But I think that in
   * order to make this call, the user must have done a lookup and
   * opened the file, and therefore should already have access.  
   */
  int
  coda_getattr(v)
      void *v;
  {
  /* true args */
      struct vop_getattr_args *ap = v;
      struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
      struct vattr *vap = ap->a_vap;
      struct ucred *cred = ap->a_cred;
      struct thread *td = ap->a_td;
  /* locals */
      int error;
  
      MARK_ENTRY(CODA_GETATTR_STATS);
  
      if (IS_UNMOUNTING(cp))
  	return ENODEV;
  
      /* Check for getattr of control object. */
      if (IS_CTL_VP(vp)) {
  	MARK_INT_FAIL(CODA_GETATTR_STATS);
  	return(ENOENT);
      }
  
      /* Check to see if the attributes have already been cached */
      if (VALID_VATTR(cp)) { 
  	CODADEBUG(CODA_GETATTR, { myprintf(("attr cache hit: %s\n",
  					coda_f2s(&cp->c_fid)));});
  	CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR))
  		 print_vattr(&cp->c_vattr); );
  	
  	*vap = cp->c_vattr;
  	MARK_INT_SAT(CODA_GETATTR_STATS);
  	return(0);
      }
  
      error = venus_getattr(vtomi(vp), &cp->c_fid, cred, td->td_proc, vap);
  
      if (!error) {
  	CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result %d\n",
  				     coda_f2s(&cp->c_fid), error)); )	       
  	    
  	CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR))
  		 print_vattr(vap);	);
  	
      {	int size = vap->va_size;
      	struct vnode *convp = cp->c_ovp;
  	if (convp != (struct vnode *)0) {
  	    vnode_pager_setsize(convp, size);
  	}
      }
  	/* If not open for write, store attributes in cnode */   
  	if ((cp->c_owrite == 0) && (coda_attr_cache)) {  
  	    cp->c_vattr = *vap;
  	    cp->c_flags |= C_VATTR; 
  	}
  	
      }
      return(error);
  }
  
  int
  coda_setattr(v)
      void *v;
  {
  /* true args */
      struct vop_setattr_args *ap = v;
      register struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
      register struct vattr *vap = ap->a_vap;
      struct ucred *cred = ap->a_cred;
      struct thread *td = ap->a_td;
  /* locals */
      int error;
  
      MARK_ENTRY(CODA_SETATTR_STATS);
  
      /* Check for setattr of control object. */
      if (IS_CTL_VP(vp)) {
  	MARK_INT_FAIL(CODA_SETATTR_STATS);
  	return(ENOENT);
      }
  
      if (codadebug & CODADBGMSK(CODA_SETATTR)) {
  	print_vattr(vap);
      }
      error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, td->td_proc);
  
      if (!error)
  	cp->c_flags &= ~C_VATTR;
  
      {	int size = vap->va_size;
      	struct vnode *convp = cp->c_ovp;
  	if (size != VNOVAL && convp != (struct vnode *)0) {
  	    vnode_pager_setsize(convp, size);
  	}
      }
      CODADEBUG(CODA_SETATTR,	myprintf(("setattr %d\n", error)); )
      return(error);
  }
  
  int
  coda_access(v)
      void *v;
  {
  /* true args */
      struct vop_access_args *ap = v;
      struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
      int mode = ap->a_mode;
      struct ucred *cred = ap->a_cred;
      struct thread *td = ap->a_td;
  /* locals */
      int error;
  
      MARK_ENTRY(CODA_ACCESS_STATS);
  
      /* Check for access of control object.  Only read access is
         allowed on it. */
      if (IS_CTL_VP(vp)) {
  	/* bogus hack - all will be marked as successes */
  	MARK_INT_SAT(CODA_ACCESS_STATS);
  	return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 
  	       ? 0 : EACCES);
      }
  
      /*
       * if the file is a directory, and we are checking exec (eg lookup) 
       * access, and the file is in the namecache, then the user must have 
       * lookup access to it.
       */
      if (coda_access_cache) {
  	if ((vp->v_type == VDIR) && (mode & VEXEC)) {
  	    if (coda_nc_lookup(cp, ".", 1, cred)) {
  		MARK_INT_SAT(CODA_ACCESS_STATS);
  		return(0);                     /* it was in the cache */
  	    }
  	}
      }
  
      error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, td->td_proc);
  
      return(error);
  }
  
  int
  coda_readlink(v)
      void *v;
  {
  /* true args */
      struct vop_readlink_args *ap = v;
      struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
      struct uio *uiop = ap->a_uio;
      struct ucred *cred = ap->a_cred;
      struct thread *td = ap->a_uio->uio_td;
  /* locals */
      int error;
      char *str;
      int len;
  
      MARK_ENTRY(CODA_READLINK_STATS);
  
      /* Check for readlink of control object. */
      if (IS_CTL_VP(vp)) {
  	MARK_INT_FAIL(CODA_READLINK_STATS);
  	return(ENOENT);
      }
  
      if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */
  	uiop->uio_rw = UIO_READ;
  	error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop);
  	if (error)
  	    MARK_INT_FAIL(CODA_READLINK_STATS);
  	else
  	    MARK_INT_SAT(CODA_READLINK_STATS);
  	return(error);
      }
  
      error = venus_readlink(vtomi(vp), &cp->c_fid, cred,
          td != NULL ? td->td_proc : NULL, &str, &len);
  
      if (!error) {
  	uiop->uio_rw = UIO_READ;
  	error = uiomove(str, len, uiop);
  
  	if (coda_symlink_cache) {
  	    cp->c_symlink = str;
  	    cp->c_symlen = len;
  	    cp->c_flags |= C_SYMLINK;
  	} else
  	    CODA_FREE(str, len);
      }
  
      CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));)
      return(error);
  }
  
  int
  coda_fsync(v)
      void *v;
  {
  /* true args */
      struct vop_fsync_args *ap = v;
      struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
      struct ucred *cred = ap->a_cred;
      struct thread *td = ap->a_td;
  /* locals */
      struct vnode *convp = cp->c_ovp;
      int error;
     
      MARK_ENTRY(CODA_FSYNC_STATS);
  
      /* Check for fsync on an unmounting object */
      /* The NetBSD kernel, in it's infinite wisdom, can try to fsync
       * after an unmount has been initiated.  This is a Bad Thing,
       * which we have to avoid.  Not a legitimate failure for stats.
       */
      if (IS_UNMOUNTING(cp)) {
  	return(ENODEV);
      }
  
      /* Check for fsync of control object. */
      if (IS_CTL_VP(vp)) {
  	MARK_INT_SAT(CODA_FSYNC_STATS);
  	return(0);
      }
  
      if (convp)
      	VOP_FSYNC(convp, cred, MNT_WAIT, td);
  
      /*
       * We see fsyncs with usecount == 1 then usecount == 0.
       * For now we ignore them.
       */
      /*
      VI_LOCK(vp);
      if (!vp->v_usecount) {
      	printf("coda_fsync on vnode %p with %d usecount.  c_flags = %x (%x)\n",
  		vp, vp->v_usecount, cp->c_flags, cp->c_flags&C_PURGING);
      }
      VI_UNLOCK(vp);
      */
  
      /*
       * We can expect fsync on any vnode at all if venus is pruging it.
       * Venus can't very well answer the fsync request, now can it?
       * Hopefully, it won't have to, because hopefully, venus preserves
       * the (possibly untrue) invariant that it never purges an open
       * vnode.  Hopefully.
       */
      if (cp->c_flags & C_PURGING) {
  	return(0);
      }
  
      /* needs research */
      return 0;
      error = venus_fsync(vtomi(vp), &cp->c_fid, cred, td->td_proc);
  
      CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); );
      return(error);
  }
  
  int
  coda_inactive(v)
      void *v;
  {
      /* XXX - at the moment, inactive doesn't look at cred, and doesn't
         have a proc pointer.  Oops. */
  /* true args */
      struct vop_inactive_args *ap = v;
      struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
      struct ucred *cred __attribute__((unused)) = NULL;
      struct thread *td __attribute__((unused)) = curthread;
  /* upcall decl */
  /* locals */
  
      /* We don't need to send inactive to venus - DCS */
      MARK_ENTRY(CODA_INACTIVE_STATS);
  
      if (IS_CTL_VP(vp)) {
  	MARK_INT_SAT(CODA_INACTIVE_STATS);
  	return 0;
      }
  
      CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n",
  				  coda_f2s(&cp->c_fid), vp->v_mount));)
   
      /* If an array has been allocated to hold the symlink, deallocate it */
      if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) {
  	if (cp->c_symlink == NULL)
  	    panic("coda_inactive: null symlink pointer in cnode");
  	
  	CODA_FREE(cp->c_symlink, cp->c_symlen);
  	cp->c_flags &= ~C_SYMLINK;
  	cp->c_symlen = 0;
      }
  
      /* Remove it from the table so it can't be found. */
      coda_unsave(cp);
      if ((struct coda_mntinfo *)(vp->v_mount->mnt_data) == NULL) {
  	myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp));
  	panic("badness in coda_inactive\n");
      }
  
      if (IS_UNMOUNTING(cp)) {
  #ifdef	DEBUG
  	printf("coda_inactive: IS_UNMOUNTING use %d: vp %p, cp %p\n", vrefcnt(vp), vp, cp);
  	if (cp->c_ovp != NULL)
  	    printf("coda_inactive: cp->ovp != NULL use %d: vp %p, cp %p\n",
  	    	   vrefcnt(vp), vp, cp);
  #endif
  	lockmgr(&cp->c_lock, LK_RELEASE, &vp->v_interlock, td);
      } else {
  #ifdef OLD_DIAGNOSTIC
  	if (vrefcnt(CTOV(cp))) {
  	    panic("coda_inactive: nonzero reference count");
  	}
  	if (cp->c_ovp != NULL) {
  	    panic("coda_inactive:  cp->ovp != NULL");
  	}
  #endif
  	VOP_UNLOCK(vp, 0, td);
  	vgone(vp);
      }
  
      MARK_INT_SAT(CODA_INACTIVE_STATS);
      return(0);
  }
  
  /*
   * Remote filesystem operations having to do with directory manipulation.
   */
  
  /* 
   * It appears that in NetBSD, lookup is supposed to return the vnode locked
   */
  int
  coda_lookup(v)
      void *v;
  {
  /* true args */
      struct vop_lookup_args *ap = v;
      struct vnode *dvp = ap->a_dvp;
      struct cnode *dcp = VTOC(dvp);
      struct vnode **vpp = ap->a_vpp;
      /* 
       * It looks as though ap->a_cnp->ni_cnd->cn_nameptr holds the rest
       * of the string to xlate, and that we must try to get at least
       * ap->a_cnp->ni_cnd->cn_namelen of those characters to macth.  I
       * could be wrong. 
       */
      struct componentname  *cnp = ap->a_cnp;
      struct ucred *cred = cnp->cn_cred;
      struct thread *td = cnp->cn_thread;
  /* locals */
      struct cnode *cp;
      const char *nm = cnp->cn_nameptr;
      int len = cnp->cn_namelen;
      CodaFid VFid;
      int	vtype;
      int error = 0;
  
      MARK_ENTRY(CODA_LOOKUP_STATS);
  
      CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n",
  				   nm, coda_f2s(&dcp->c_fid))););
  
      /* Check for lookup of control object. */
      if (IS_CTL_NAME(dvp, nm, len)) {
  	*vpp = coda_ctlvp;
  	vref(*vpp);
  	MARK_INT_SAT(CODA_LOOKUP_STATS);
  	goto exit;
      }
  
      if (len+1 > CODA_MAXNAMLEN) {
  	MARK_INT_FAIL(CODA_LOOKUP_STATS);
  
  	CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %s (%s)\n",
  					 coda_f2s(&dcp->c_fid), nm)););
  	*vpp = (struct vnode *)0;
  	error = EINVAL;
  	goto exit;
      }
      /* First try to look the file up in the cfs name cache */
      /* lock the parent vnode? */
      cp = coda_nc_lookup(dcp, nm, len, cred);
      if (cp) {
  	*vpp = CTOV(cp);
  	vref(*vpp);
  	CODADEBUG(CODA_LOOKUP, 
  		 myprintf(("lookup result %d vpp %p\n",error,*vpp));)
      } else {
  	
  	/* The name wasn't cached, so we need to contact Venus */
  	error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, td->td_proc, &VFid, &vtype);
  	
  	if (error) {
  	    MARK_INT_FAIL(CODA_LOOKUP_STATS);
  
  	    CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n",
  					     coda_f2s(&dcp->c_fid), nm, error));)
  	    *vpp = (struct vnode *)0;
  	} else {
  	    MARK_INT_SAT(CODA_LOOKUP_STATS);
  	    CODADEBUG(CODA_LOOKUP, 
  		     myprintf(("lookup: %s type %o result %d\n",
  			       coda_f2s(&VFid), vtype, error)); )
  	    cp = make_coda_node(&VFid, dvp->v_mount, vtype);
  	    *vpp = CTOV(cp);
  	    
  	    /* enter the new vnode in the Name Cache only if the top bit isn't set */
  	    /* And don't enter a new vnode for an invalid one! */
  	    if (!(vtype & CODA_NOCACHE))
  		coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
  	}
      }
  
   exit:
      /* 
       * If we are creating, and this was the last name to be looked up,
       * and the error was ENOENT, then there really shouldn't be an
       * error and we can make the leaf NULL and return success.  Since
       * this is supposed to work under Mach as well as NetBSD, we're
       * leaving this fn wrapped.  We also must tell lookup/namei that
       * we need to save the last component of the name.  (Create will
       * have to free the name buffer later...lucky us...)
       */
      if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME))
  	&& (cnp->cn_flags & ISLASTCN)
  	&& (error == ENOENT))
      {
  	error = EJUSTRETURN;
  	cnp->cn_flags |= SAVENAME;
  	*ap->a_vpp = NULL;
      }
  
      /* 
       * If we are removing, and we are at the last element, and we
       * found it, then we need to keep the name around so that the
       * removal will go ahead as planned.  Unfortunately, this will
       * probably also lock the to-be-removed vnode, which may or may
       * not be a good idea.  I'll have to look at the bits of
       * coda_remove to make sure.  We'll only save the name if we did in
       * fact find the name, otherwise coda_remove won't have a chance
       * to free the pathname.  
       */
      if ((cnp->cn_nameiop == DELETE)
  	&& (cnp->cn_flags & ISLASTCN)
  	&& !error)
      {
  	cnp->cn_flags |= SAVENAME;
      }
  
      /* 
       * If the lookup went well, we need to (potentially?) unlock the
       * parent, and lock the child.  We are only responsible for
       * checking to see if the parent is supposed to be unlocked before
       * we return.  We must always lock the child (provided there is
       * one, and (the parent isn't locked or it isn't the same as the
       * parent.)  Simple, huh?  We can never leave the parent locked unless
       * we are ISLASTCN
       */
      if (!error || (error == EJUSTRETURN)) {
  	if (!(cnp->cn_flags & LOCKPARENT) || !(cnp->cn_flags & ISLASTCN)) {
  	    if ((error = VOP_UNLOCK(dvp, 0, td))) {
  		return error; 
  	    }	    
  	    /* 
  	     * The parent is unlocked.  As long as there is a child,
  	     * lock it without bothering to check anything else. 
  	     */
  	    if (*ap->a_vpp) {
  		if ((error = VOP_LOCK(*ap->a_vpp, LK_EXCLUSIVE, td))) {
  		    printf("coda_lookup: ");
  		    panic("unlocked parent but couldn't lock child");
  		}
  	    }
  	} else {
  	    /* The parent is locked, and may be the same as the child */
  	    if (*ap->a_vpp && (*ap->a_vpp != dvp)) {
  		/* Different, go ahead and lock it. */
  		if ((error = VOP_LOCK(*ap->a_vpp, LK_EXCLUSIVE, td))) {
  		    printf("coda_lookup: ");
  		    panic("unlocked parent but couldn't lock child");
  		}
  	    }
  	}
      } else {
  	/* If the lookup failed, we need to ensure that the leaf is NULL */
  	/* Don't change any locking? */
  	*ap->a_vpp = NULL;
      }
      return(error);
  }
  
  /*ARGSUSED*/
  int
  coda_create(v)
      void *v;
  {
  /* true args */
      struct vop_create_args *ap = v;
      struct vnode *dvp = ap->a_dvp;
      struct cnode *dcp = VTOC(dvp);
      struct vattr *va = ap->a_vap;
      int exclusive = 1;
      int mode = ap->a_vap->va_mode;
      struct vnode **vpp = ap->a_vpp;
      struct componentname  *cnp = ap->a_cnp;
      struct ucred *cred = cnp->cn_cred;
      struct thread *td = cnp->cn_thread;
  /* locals */
      int error;
      struct cnode *cp;
      const char *nm = cnp->cn_nameptr;
      int len = cnp->cn_namelen;
      CodaFid VFid;
      struct vattr attr;
  
      MARK_ENTRY(CODA_CREATE_STATS);
  
      /* All creates are exclusive XXX */
      /* I'm assuming the 'mode' argument is the file mode bits XXX */
  
      /* Check for create of control object. */
      if (IS_CTL_NAME(dvp, nm, len)) {
  	*vpp = (struct vnode *)0;
  	MARK_INT_FAIL(CODA_CREATE_STATS);
  	return(EACCES);
      }
  
      error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, td->td_proc, &VFid, &attr);
  
      if (!error) {
  	
  	/* If this is an exclusive create, panic if the file already exists. */
  	/* Venus should have detected the file and reported EEXIST. */
  
  	if ((exclusive == 1) &&
  	    (coda_find(&VFid) != NULL))
  	    panic("cnode existed for newly created file!");
  	
  	cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type);
  	*vpp = CTOV(cp);
  	
  	/* Update va to reflect the new attributes. */
  	(*va) = attr;
  	
  	/* Update the attribute cache and mark it as valid */
  	if (coda_attr_cache) {
  	    VTOC(*vpp)->c_vattr = attr;
  	    VTOC(*vpp)->c_flags |= C_VATTR;       
  	}
  
  	/* Invalidate the parent's attr cache, the modification time has changed */
  	VTOC(dvp)->c_flags &= ~C_VATTR;
  	
  	/* enter the new vnode in the Name Cache */
  	coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
  	
  	CODADEBUG(CODA_CREATE, 
  		  myprintf(("create: %s, result %d\n",
  			   coda_f2s(&VFid), error)); )
      } else {
  	*vpp = (struct vnode *)0;
  	CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));)
      }
  
      if (!error) {
  	if (cnp->cn_flags & LOCKLEAF) {
  	    if ((error = VOP_LOCK(*ap->a_vpp, LK_EXCLUSIVE, td))) {
  		printf("coda_create: ");
  		panic("unlocked parent but couldn't lock child");
  	    }
  	}
  #ifdef OLD_DIAGNOSTIC
  	else {
  	    printf("coda_create: LOCKLEAF not set!\n");
  	}
  #endif
      }
      return(error);
  }
  
  int
  coda_remove(v)
      void *v;
  {
  /* true args */
      struct vop_remove_args *ap = v;
      struct vnode *dvp = ap->a_dvp;
      struct cnode *cp = VTOC(dvp);
      struct componentname  *cnp = ap->a_cnp;
      struct ucred *cred = cnp->cn_cred;
      struct thread *td = cnp->cn_thread;
  /* locals */
      int error;
      const char *nm = cnp->cn_nameptr;
      int len = cnp->cn_namelen;
      struct cnode *tp;
  
      MARK_ENTRY(CODA_REMOVE_STATS);
  
      CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n",
  				     nm, coda_f2s(&cp->c_fid))););
      /* Remove the file's entry from the CODA Name Cache */
      /* We're being conservative here, it might be that this person
       * doesn't really have sufficient access to delete the file
       * but we feel zapping the entry won't really hurt anyone -- dcs
       */
      /* I'm gonna go out on a limb here. If a file and a hardlink to it
       * exist, and one is removed, the link count on the other will be
       * off by 1. We could either invalidate the attrs if cached, or
       * fix them. I'll try to fix them. DCS 11/8/94
       */
      tp = coda_nc_lookup(VTOC(dvp), nm, len, cred);
      if (tp) {
  	if (VALID_VATTR(tp)) {	/* If attrs are cached */
  	    if (tp->c_vattr.va_nlink > 1) {	/* If it's a hard link */
  		tp->c_vattr.va_nlink--;
  	    }
  	}
  	
  	coda_nc_zapfile(VTOC(dvp), nm, len); 
  	/* No need to flush it if it doesn't exist! */
      }
      /* Invalidate the parent's attr cache, the modification time has changed */
      VTOC(dvp)->c_flags &= ~C_VATTR;
  
      /* Check for remove of control object. */
      if (IS_CTL_NAME(dvp, nm, len)) {
  	MARK_INT_FAIL(CODA_REMOVE_STATS);
  	return(ENOENT);
      }
  
      error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, td->td_proc);
  
      CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); )
  
      return(error);
  }
  
  int
  coda_link(v)
      void *v;
  {
  /* true args */
      struct vop_link_args *ap = v;
      struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
      struct vnode *tdvp = ap->a_tdvp;
      struct cnode *tdcp = VTOC(tdvp);
      struct componentname *cnp = ap->a_cnp;
      struct ucred *cred = cnp->cn_cred;
      struct thread *td = cnp->cn_thread;
  /* locals */
      int error;
      const char *nm = cnp->cn_nameptr;
      int len = cnp->cn_namelen;
  
      MARK_ENTRY(CODA_LINK_STATS);
  
      if (codadebug & CODADBGMSK(CODA_LINK)) {
  	myprintf(("nb_link:   vp fid: %s\n",
  		  coda_f2s(&cp->c_fid)));
  	myprintf(("nb_link: tdvp fid: %s)\n",
  		  coda_f2s(&tdcp->c_fid)));	
      }
      if (codadebug & CODADBGMSK(CODA_LINK)) {
  	myprintf(("link:   vp fid: %s\n",
  		  coda_f2s(&cp->c_fid)));
  	myprintf(("link: tdvp fid: %s\n",
  		  coda_f2s(&tdcp->c_fid)));
      }
  
      /* Check for link to/from control object. */
      if (IS_CTL_NAME(tdvp, nm, len) || IS_CTL_VP(vp)) {
  	MARK_INT_FAIL(CODA_LINK_STATS);
  	return(EACCES);
      }
  
      error = venus_link(vtomi(vp), &cp->c_fid, &tdcp->c_fid, nm, len, cred, td->td_proc);
  
      /* Invalidate the parent's attr cache, the modification time has changed */
      VTOC(tdvp)->c_flags &= ~C_VATTR;
      VTOC(vp)->c_flags &= ~C_VATTR;
  
      CODADEBUG(CODA_LINK,	myprintf(("in link result %d\n",error)); )
  
      return(error);
  }
  
  int
  coda_rename(v)
      void *v;
  {
  /* true args */
      struct vop_rename_args *ap = v;
      struct vnode *odvp = ap->a_fdvp;
      struct cnode *odcp = VTOC(odvp);
      struct componentname  *fcnp = ap->a_fcnp;
      struct vnode *ndvp = ap->a_tdvp;
      struct cnode *ndcp = VTOC(ndvp);
      struct componentname  *tcnp = ap->a_tcnp;
      struct ucred *cred = fcnp->cn_cred;
      struct thread *td = fcnp->cn_thread;
  /* true args */
      int error;
      const char *fnm = fcnp->cn_nameptr;
      int flen = fcnp->cn_namelen;
      const char *tnm = tcnp->cn_nameptr;
      int tlen = tcnp->cn_namelen;
  
      MARK_ENTRY(CODA_RENAME_STATS);
  
      /* Hmmm.  The vnodes are already looked up.  Perhaps they are locked?
         This could be Bad. XXX */
  #ifdef OLD_DIAGNOSTIC
      if ((fcnp->cn_cred != tcnp->cn_cred)
  	|| (fcnp->cn_thread != tcnp->cn_thread))
      {
  	panic("coda_rename: component names don't agree");
      }
  #endif
  
      /* Check for rename involving control object. */ 
      if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) {
  	MARK_INT_FAIL(CODA_RENAME_STATS);
  	return(EACCES);
      }
  
      /* Problem with moving directories -- need to flush entry for .. */
      if (odvp != ndvp) {
  	struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred);
  	if (ovcp) {
  	    struct vnode *ovp = CTOV(ovcp);
  	    if ((ovp) &&
  		(ovp->v_type == VDIR)) /* If it's a directory */
  		coda_nc_zapfile(VTOC(ovp),"..", 2);
  	}
      }
  
      /* Remove the entries for both source and target files */
      coda_nc_zapfile(VTOC(odvp), fnm, flen);
      coda_nc_zapfile(VTOC(ndvp), tnm, tlen);
  
      /* Invalidate the parent's attr cache, the modification time has changed */
      VTOC(odvp)->c_flags &= ~C_VATTR;
      VTOC(ndvp)->c_flags &= ~C_VATTR;
  
      if (flen+1 > CODA_MAXNAMLEN) {
  	MARK_INT_FAIL(CODA_RENAME_STATS);
  	error = EINVAL;
  	goto exit;
      }
  
      if (tlen+1 > CODA_MAXNAMLEN) {
  	MARK_INT_FAIL(CODA_RENAME_STATS);
  	error = EINVAL;
  	goto exit;
      }
  
      error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, td->td_proc);
  
   exit:
      CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));)
      /* XXX - do we need to call cache pureg on the moved vnode? */
      cache_purge(ap->a_fvp);
  
      /* It seems to be incumbent on us to drop locks on all four vnodes */
      /* From-vnodes are not locked, only ref'd.  To-vnodes are locked. */
  
      vrele(ap->a_fvp);
      vrele(odvp);
  
      if (ap->a_tvp) {
  	if (ap->a_tvp == ndvp) {
  	    vrele(ap->a_tvp);
  	} else {
  	    vput(ap->a_tvp);
  	}
      }
  
      vput(ndvp);
      return(error);
  }
  
  int
  coda_mkdir(v)
      void *v;
  {
  /* true args */
      struct vop_mkdir_args *ap = v;
      struct vnode *dvp = ap->a_dvp;
      struct cnode *dcp = VTOC(dvp);	
      struct componentname  *cnp = ap->a_cnp;
      register struct vattr *va = ap->a_vap;
      struct vnode **vpp = ap->a_vpp;
      struct ucred *cred = cnp->cn_cred;
      struct thread *td = cnp->cn_thread;
  /* locals */
      int error;
      const char *nm = cnp->cn_nameptr;
      int len = cnp->cn_namelen;
      struct cnode *cp;
      CodaFid VFid;
      struct vattr ova;
  
      MARK_ENTRY(CODA_MKDIR_STATS);
  
      /* Check for mkdir of target object. */
      if (IS_CTL_NAME(dvp, nm, len)) {
  	*vpp = (struct vnode *)0;
  	MARK_INT_FAIL(CODA_MKDIR_STATS);
  	return(EACCES);
      }
  
      if (len+1 > CODA_MAXNAMLEN) {
  	*vpp = (struct vnode *)0;
  	MARK_INT_FAIL(CODA_MKDIR_STATS);
  	return(EACCES);
      }
  
      error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, td->td_proc, &VFid, &ova);
  
      if (!error) {
  	if (coda_find(&VFid) != NULL)
  	    panic("cnode existed for newly created directory!");
  	
  	
  	cp =  make_coda_node(&VFid, dvp->v_mount, va->va_type);
  	*vpp = CTOV(cp);
  	
  	/* enter the new vnode in the Name Cache */
  	coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
  
  	/* as a side effect, enter "." and ".." for the directory */
  	coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp));
  	coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp));
  
  	if (coda_attr_cache) {
  	    VTOC(*vpp)->c_vattr = ova;		/* update the attr cache */
  	    VTOC(*vpp)->c_flags |= C_VATTR;	/* Valid attributes in cnode */
  	}
  
  	/* Invalidate the parent's attr cache, the modification time has changed */
  	VTOC(dvp)->c_flags &= ~C_VATTR;
  	
  	CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n",
  					 coda_f2s(&VFid), error)); )
  	} else {
  	*vpp = (struct vnode *)0;
  	CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));)
      }
  
      return(error);
  }
  
  int
  coda_rmdir(v)
      void *v;
  {
  /* true args */
      struct vop_rmdir_args *ap = v;
      struct vnode *dvp = ap->a_dvp;
      struct cnode *dcp = VTOC(dvp);
      struct componentname  *cnp = ap->a_cnp;
      struct ucred *cred = cnp->cn_cred;
      struct thread *td = cnp->cn_thread;
  /* true args */
      int error;
      const char *nm = cnp->cn_nameptr;
      int len = cnp->cn_namelen;
      struct cnode *cp;
     
      MARK_ENTRY(CODA_RMDIR_STATS);
  
      /* Check for rmdir of control object. */
      if (IS_CTL_NAME(dvp, nm, len)) {
  	MARK_INT_FAIL(CODA_RMDIR_STATS);
  	return(ENOENT);
      }
  
      /* We're being conservative here, it might be that this person
       * doesn't really have sufficient access to delete the file
       * but we feel zapping the entry won't really hurt anyone -- dcs
       */
      /*
       * As a side effect of the rmdir, remove any entries for children of
       * the directory, especially "." and "..".
       */
      cp = coda_nc_lookup(dcp, nm, len, cred);
      if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL);
  
      /* Remove the file's entry from the CODA Name Cache */
      coda_nc_zapfile(dcp, nm, len);
  
      /* Invalidate the parent's attr cache, the modification time has changed */
      dcp->c_flags &= ~C_VATTR;
  
      error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, td->td_proc);
  
      CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); )
  
      return(error);
  }
  
  int
  coda_symlink(v)
      void *v;
  {
  /* true args */
      struct vop_symlink_args *ap = v;
      struct vnode *tdvp = ap->a_dvp;
      struct cnode *tdcp = VTOC(tdvp);	
      struct componentname *cnp = ap->a_cnp;
      struct vattr *tva = ap->a_vap;
      char *path = ap->a_target;
      struct ucred *cred = cnp->cn_cred;
      struct thread *td = cnp->cn_thread;
      struct vnode **vpp = ap->a_vpp;
  /* locals */
      int error;
      /* 
       * XXX I'm assuming the following things about coda_symlink's
       * arguments: 
       *       t(foo) is the new name/parent/etc being created.
       *       lname is the contents of the new symlink. 
       */
      char *nm = cnp->cn_nameptr;
      int len = cnp->cn_namelen;
      int plen = strlen(path);
  
      /* 
       * Here's the strategy for the moment: perform the symlink, then
       * do a lookup to grab the resulting vnode.  I know this requires
       * two communications with Venus for a new sybolic link, but
       * that's the way the ball bounces.  I don't yet want to change
       * the way the Mach symlink works.  When Mach support is
       * deprecated, we should change symlink so that the common case
       * returns the resultant vnode in a vpp argument.
       */
  
      MARK_ENTRY(CODA_SYMLINK_STATS);
  
      /* Check for symlink of control object. */
      if (IS_CTL_NAME(tdvp, nm, len)) {
  	MARK_INT_FAIL(CODA_SYMLINK_STATS);
  	return(EACCES);
      }
  
      if (plen+1 > CODA_MAXPATHLEN) {
  	MARK_INT_FAIL(CODA_SYMLINK_STATS);
  	return(EINVAL);
      }
  
      if (len+1 > CODA_MAXNAMLEN) {
  	MARK_INT_FAIL(CODA_SYMLINK_STATS);
  	error = EINVAL;
  	goto exit;
      }
  
      error = venus_symlink(vtomi(tdvp), &tdcp->c_fid, path, plen, nm, len, tva, cred, td->td_proc);
  
      /* Invalidate the parent's attr cache, the modification time has changed */
      tdcp->c_flags &= ~C_VATTR;
  
      if (error == 0)
  	error = VOP_LOOKUP(tdvp, vpp, cnp);
  
   exit:    
      CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); )
      return(error);
  }
  
  /*
   * Read directory entries.
   */
  int
  coda_readdir(v)
      void *v;
  {
  /* true args */
      struct vop_readdir_args *ap = v;
      struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
      register struct uio *uiop = ap->a_uio;
      struct ucred *cred = ap->a_cred;
      int *eofflag = ap->a_eofflag;
      u_long **cookies = ap->a_cookies;
      int *ncookies = ap->a_ncookies;
      struct thread *td = ap->a_uio->uio_td;
  /* upcall decl */
  /* locals */
      int error = 0;
  
      MARK_ENTRY(CODA_READDIR_STATS);
  
      CODADEBUG(CODA_READDIR, myprintf(("coda_readdir(%p, %d, %lld, %d)\n",
  				      (void *)uiop->uio_iov->iov_base,
  				      uiop->uio_resid,
  				      (long long)uiop->uio_offset,
  				      uiop->uio_segflg)); )
  	
      /* Check for readdir of control object. */
      if (IS_CTL_VP(vp)) {
  	MARK_INT_FAIL(CODA_READDIR_STATS);
  	return(ENOENT);
      }
  
      {
  	/* If directory is not already open do an "internal open" on it. */
  	int opened_internally = 0;
  	if (cp->c_ovp == NULL) {
  	    opened_internally = 1;
  	    MARK_INT_GEN(CODA_OPEN_STATS);
  	    error = VOP_OPEN(vp, FREAD, cred, td, -1);
  printf("coda_readdir: Internally Opening %p\n", vp);
  	    if (error) {
  		printf("coda_readdir: VOP_OPEN on container failed %d\n", error);
  		return (error);
  	    }
  	    if (vp->v_type == VREG) {
  		error = vfs_object_create(vp, td, cred);
  		if (error != 0) {
  		    printf("coda_readdir: vfs_object_create() returns %d\n", error);
  		    vput(vp);
  		}
  	    }
  	    if (error) return(error);
  	}
  	
  	/* Have UFS handle the call. */
  	CODADEBUG(CODA_READDIR, myprintf(("indirect readdir: fid = %s, refcnt = %d\n", coda_f2s(&cp->c_fid), vp->v_usecount)); )
  	error = VOP_READDIR(cp->c_ovp, uiop, cred, eofflag, ncookies,
  			       cookies);
  	
  	if (error)
  	    MARK_INT_FAIL(CODA_READDIR_STATS);
  	else
  	    MARK_INT_SAT(CODA_READDIR_STATS);
  	
  	/* Do an "internal close" if necessary. */ 
  	if (opened_internally) {
  	    MARK_INT_GEN(CODA_CLOSE_STATS);
  	    (void)VOP_CLOSE(vp, FREAD, cred, td);
  	}
      }
  
      return(error);
  }
  
  /*
   * Convert from filesystem blocks to device blocks
   */
  int
  coda_bmap(v)
      void *v;
  {
      /* XXX on the global proc */
  /* true args */
      struct vop_bmap_args *ap = v;
      struct vnode *vp __attribute__((unused)) = ap->a_vp;	/* file's vnode */
      daddr_t bn __attribute__((unused)) = ap->a_bn;	/* fs block number */
      struct vnode **vpp = ap->a_vpp;			/* RETURN vp of device */
      daddr_t *bnp __attribute__((unused)) = ap->a_bnp;	/* RETURN device block number */
      struct thread *td __attribute__((unused)) = curthread;
  /* upcall decl */
  /* locals */
  
  	int ret = 0;
  	struct cnode *cp;
  
  	cp = VTOC(vp);
  	if (cp->c_ovp) {
  		return EINVAL;
  		ret =  VOP_BMAP(cp->c_ovp, bn, vpp, bnp, ap->a_runp, ap->a_runb);
  #if	0
  		printf("VOP_BMAP(cp->c_ovp %p, bn %p, vpp %p, bnp %lld, ap->a_runp %p, ap->a_runb %p) = %d\n",
  			cp->c_ovp, bn, vpp, bnp, ap->a_runp, ap->a_runb, ret);
  #endif
  		return ret;
  	} else {
  #if	0
  		printf("coda_bmap: no container\n");
  #endif
  		return(EOPNOTSUPP);
  	}
  }
  
  int
  coda_reclaim(v) 
      void *v;
  {
  /* true args */
      struct vop_reclaim_args *ap = v;
      struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
  /* upcall decl */
  /* locals */
  
  /*
   * Forced unmount/flush will let vnodes with non zero use be destroyed!
   */
      ENTRY;
  
      if (IS_UNMOUNTING(cp)) {
  #ifdef	DEBUG
  	if (VTOC(vp)->c_ovp) {
  	    if (IS_UNMOUNTING(cp))
  		printf("coda_reclaim: c_ovp not void: vp %p, cp %p\n", vp, cp);
  	}
  #endif
      } else {
  #ifdef OLD_DIAGNOSTIC
  	if (vrefcnt(vp) != 0) 
  	    print("coda_reclaim: pushing active %p\n", vp);
  	if (VTOC(vp)->c_ovp) {
  	    panic("coda_reclaim: c_ovp not void");
      }
  #endif
      }	
      cache_purge(vp);
      lockdestroy(&(VTOC(vp)->c_lock));
      coda_free(VTOC(vp));
      VTOC(vp) = NULL;
      return (0);
  }
  
  int
  coda_lock(v)
      void *v;
  {
  /* true args */
      struct vop_lock_args *ap = v;
      struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
      struct thread *td = ap->a_td;
  /* upcall decl */
  /* locals */
  
      ENTRY;
  
      if (coda_lockdebug) {
  	myprintf(("Attempting lock on %s\n",
  		  coda_f2s(&cp->c_fid)));
      }
  
  #ifndef	DEBUG_LOCKS
      return (lockmgr(&cp->c_lock, ap->a_flags, &vp->v_interlock, td));
  #else
      return (debuglockmgr(&cp->c_lock, ap->a_flags, &vp->v_interlock, td,
  			 "coda_lock", vp->filename, vp->line));
  #endif
  }
  
  int
  coda_unlock(v)
      void *v;
  {
  /* true args */
      struct vop_unlock_args *ap = v;
      struct vnode *vp = ap->a_vp;
      struct cnode *cp = VTOC(vp);
      struct thread *td = ap->a_td;
  /* upcall decl */
  /* locals */
  
      ENTRY;
      if (coda_lockdebug) {
  	myprintf(("Attempting unlock on %s\n",
  		  coda_f2s(&cp->c_fid)));
      }
  
      return (lockmgr(&cp->c_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock, td));
  }
  
  int
  coda_islocked(v)
      void *v;
  {
  /* true args */
      struct vop_islocked_args *ap = v;
      struct cnode *cp = VTOC(ap->a_vp);
      ENTRY;
  
      return (lockstatus(&cp->c_lock, ap->a_td));
  }
  
  /* How one looks up a vnode given a device/inode pair: */
  int
  coda_grab_vnode(dev_t dev, ino_t ino, struct vnode **vpp)
  {
      /* This is like VFS_VGET() or igetinode()! */
      int           error;
      struct mount *mp;
  
      if (!(mp = devtomp(dev))) {
  	myprintf(("coda_grab_vnode: devtomp(%#lx) returns NULL\n",
  		  (u_long)dev2udev(dev)));
  	return(ENXIO);
      }
  
      /* XXX - ensure that nonzero-return means failure */
      error = VFS_VGET(mp,ino,LK_EXCLUSIVE,vpp);
      if (error) {
  	myprintf(("coda_grab_vnode: iget/vget(%lx, %lu) returns %p, err %d\n", 
  		  (u_long)dev2udev(dev), (u_long)ino, (void *)*vpp, error));
  	return(ENOENT);
      }
      return(0);
  }
  
  void
  print_vattr( attr )
  	struct vattr *attr;
  {
      char *typestr;
  
      switch (attr->va_type) {
      case VNON:
  	typestr = "VNON";
  	break;
      case VREG:
  	typestr = "VREG";
  	break;
      case VDIR:
  	typestr = "VDIR";
  	break;
      case VBLK:
  	typestr = "VBLK";
  	break;
      case VCHR:
  	typestr = "VCHR";
  	break;
      case VLNK:
  	typestr = "VLNK";
  	break;
      case VSOCK:
  	typestr = "VSCK";
  	break;
      case VFIFO:
  	typestr = "VFFO";
  	break;
      case VBAD:
  	typestr = "VBAD";
  	break;
      default:
  	typestr = "????";
  	break;
      }
  
  
      myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n",
  	      typestr, (int)attr->va_mode, (int)attr->va_uid,
  	      (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev));
  
      myprintf(("      fileid %d nlink %d size %d blocksize %d bytes %d\n",
  	      (int)attr->va_fileid, (int)attr->va_nlink, 
  	      (int)attr->va_size,
  	      (int)attr->va_blocksize,(int)attr->va_bytes));
      myprintf(("      gen %ld flags %ld vaflags %d\n",
  	      attr->va_gen, attr->va_flags, attr->va_vaflags));
      myprintf(("      atime sec %d nsec %d\n",
  	      (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec));
      myprintf(("      mtime sec %d nsec %d\n",
  	      (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec));
      myprintf(("      ctime sec %d nsec %d\n",
  	      (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec));
  }
  
  /* How to print a ucred */
  void
  print_cred(cred)
  	struct ucred *cred;
  {
  
  	int i;
  
  	myprintf(("ref %d\tuid %d\n",cred->cr_ref,cred->cr_uid));
  
  	for (i=0; i < cred->cr_ngroups; i++)
  		myprintf(("\tgroup %d: (%d)\n",i,cred->cr_groups[i]));
  	myprintf(("\n"));
  
  }
  
  /*
   * Return a vnode for the given fid.
   * If no cnode exists for this fid create one and put it
   * in a table hashed by coda_f2i().  If the cnode for
   * this fid is already in the table return it (ref count is
   * incremented by coda_find.  The cnode will be flushed from the
   * table when coda_inactive calls coda_unsave.
   */
  struct cnode *
  make_coda_node(fid, vfsp, type)
       CodaFid *fid; struct mount *vfsp; short type;
  {
      struct cnode *cp;
      int          err;
  
      if ((cp = coda_find(fid)) == NULL) {
  	struct vnode *vp;
  	
  	cp = coda_alloc();
  	lockinit(&cp->c_lock, PINOD, "cnode", 0, 0);
  	cp->c_fid = *fid;
  	
  	err = getnewvnode("coda", vfsp, coda_vnodeop_p, &vp);  
  	if (err) {                                                
  	    panic("coda: getnewvnode returned error %d\n", err);   
  	}                                                         
  	vp->v_data = cp;                                          
  	vp->v_type = type;                                      
  	cp->c_vnode = vp;                                         
  	coda_save(cp);
  	
      } else {
  	vref(CTOV(cp));
      }
  
      return cp;
  }
  
  int
  coda_pathconf(v)
  	void *v;
  {
  	struct vop_pathconf_args *ap;
  	int error;
  	register_t *retval;
  
  	ap = v;
  	retval = ap->a_retval;
  	error = 0;
  
  	switch (ap->a_name) {
  	case _PC_NAME_MAX:
  		*retval = CODA_MAXNAMLEN;
  		break;
  	case _PC_PATH_MAX:
  		*retval = CODA_MAXPATHLEN;
  		break;
  	default:
  		error = vop_stdpathconf(ap);
  		break;
  	}
  
  	return (error);
  }
  