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Add puffs_setback(), which can be used to set setbacks for nodes before
the call returns to the kernel.  Currently it can be called only from
open(), mmap(), remove() and rmdir().  (But that might change)

/*	$NetBSD: puffs.c,v 1.40 2007/05/07 17:16:07 pooka Exp $	*/

/*
 * Copyright (c) 2005, 2006  Antti Kantee.  All Rights Reserved.
 *
 * Development of this software was supported by the
 * Google Summer of Code program and the Ulla Tuominen Foundation.
 * The Google SoC project was mentored by Bill Studenmund.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the company nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#if !defined(lint)
__RCSID("$NetBSD: puffs.c,v 1.40 2007/05/07 17:16:07 pooka Exp $");
#endif /* !lint */

#include <sys/param.h>
#include <sys/mount.h>

#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <mntopts.h>
#include <puffs.h>
#include <puffsdump.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

#include "puffs_priv.h"

/* Most file systems want this for opts, so just give it to them */
const struct mntopt puffsmopts[] = {
	MOPT_STDOPTS,
	PUFFSMOPT_STD,
	MOPT_NULL,
};

#define FILLOP(lower, upper)						\
do {									\
	if (pops->puffs_node_##lower)					\
		opmask[PUFFS_VN_##upper] = 1;				\
} while (/*CONSTCOND*/0)
static void
fillvnopmask(struct puffs_ops *pops, uint8_t *opmask)
{

	memset(opmask, 0, PUFFS_VN_MAX);

	FILLOP(create,   CREATE);
	FILLOP(mknod,    MKNOD);
	FILLOP(open,     OPEN);
	FILLOP(close,    CLOSE);
	FILLOP(access,   ACCESS);
	FILLOP(getattr,  GETATTR);
	FILLOP(setattr,  SETATTR);
	FILLOP(poll,     POLL); /* XXX: not ready in kernel */
	FILLOP(mmap,     MMAP);
	FILLOP(fsync,    FSYNC);
	FILLOP(seek,     SEEK);
	FILLOP(remove,   REMOVE);
	FILLOP(link,     LINK);
	FILLOP(rename,   RENAME);
	FILLOP(mkdir,    MKDIR);
	FILLOP(rmdir,    RMDIR);
	FILLOP(symlink,  SYMLINK);
	FILLOP(readdir,  READDIR);
	FILLOP(readlink, READLINK);
	FILLOP(reclaim,  RECLAIM);
	FILLOP(inactive, INACTIVE);
	FILLOP(print,    PRINT);
	FILLOP(read,     READ);
	FILLOP(write,    WRITE);

	/* XXX: not implemented in the kernel */
	FILLOP(getextattr, GETEXTATTR);
	FILLOP(setextattr, SETEXTATTR);
	FILLOP(listextattr, LISTEXTATTR);
}
#undef FILLOP

int
puffs_getselectable(struct puffs_usermount *pu)
{

	return pu->pu_kargs.pa_fd;
}

int
puffs_setblockingmode(struct puffs_usermount *pu, int mode)
{
	int x;

	x = mode;
	return ioctl(pu->pu_kargs.pa_fd, FIONBIO, &x);
}

int
puffs_getstate(struct puffs_usermount *pu)
{

	return pu->pu_state;
}

void
puffs_setstacksize(struct puffs_usermount *pu, size_t ss)
{

	pu->pu_cc_stacksize = ss;
}

struct puffs_pathobj *
puffs_getrootpathobj(struct puffs_usermount *pu)
{
	struct puffs_node *pnr;

	pnr = pu->pu_pn_root;
	if (pnr == NULL) {
		errno = ENOENT;
		return NULL;
	}

	return &pnr->pn_po;
}

void
puffs_setroot(struct puffs_usermount *pu, struct puffs_node *pn)
{

	pu->pu_pn_root = pn;
}

struct puffs_node *
puffs_getroot(struct puffs_usermount *pu)
{

	return pu->pu_pn_root;
}

void *
puffs_getspecific(struct puffs_usermount *pu)
{

	return pu->pu_privdata;
}

size_t
puffs_getmaxreqlen(struct puffs_usermount *pu)
{

	return pu->pu_kargs.pa_maxreqlen;
}

void
puffs_setmaxreqlen(struct puffs_usermount *pu, size_t reqlen)
{

	if (pu->pu_state != PUFFS_STATE_BEFOREMOUNT)
		warnx("puffs_setmaxreqlen: call has effect only "
		    "before mount\n");

	pu->pu_kargs.pa_maxreqlen = reqlen;
}

void
puffs_setfhsize(struct puffs_usermount *pu, size_t fhsize, int flags)
{

	if (pu->pu_state != PUFFS_STATE_BEFOREMOUNT)
		warnx("puffs_setfhsize: call has effect only before mount\n");

	pu->pu_kargs.pa_fhsize = fhsize;
	pu->pu_kargs.pa_fhflags = flags;
}

void
puffs_setncookiehash(struct puffs_usermount *pu, int nhash)
{

	if (pu->pu_state != PUFFS_STATE_BEFOREMOUNT)
		warnx("puffs_setfhsize: call has effect only before mount\n");

	pu->pu_kargs.pa_nhashbuckets = nhash;
}

void
puffs_set_pathbuild(struct puffs_usermount *pu, pu_pathbuild_fn fn)
{

	pu->pu_pathbuild = fn;
}

void
puffs_set_pathtransform(struct puffs_usermount *pu, pu_pathtransform_fn fn)
{

	pu->pu_pathtransform = fn;
}

void
puffs_set_pathcmp(struct puffs_usermount *pu, pu_pathcmp_fn fn)
{

	pu->pu_pathcmp = fn;
}

void
puffs_set_pathfree(struct puffs_usermount *pu, pu_pathfree_fn fn)
{

	pu->pu_pathfree = fn;
}

void
puffs_set_namemod(struct puffs_usermount *pu, pu_namemod_fn fn)
{

	pu->pu_namemod = fn;
}

void
puffs_setback(struct puffs_cc *pcc, int whatback)
{
	struct puffs_req *preq = pcc->pcc_preq;

	assert(PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_VN && (
	    preq->preq_optype == PUFFS_VN_OPEN ||
	    preq->preq_optype == PUFFS_VN_MMAP ||
	    preq->preq_optype == PUFFS_VN_REMOVE ||
	    preq->preq_optype == PUFFS_VN_RMDIR));

	preq->preq_setbacks |= whatback & PUFFS_SETBACK_MASK;
}

int
puffs_domount(struct puffs_usermount *pu, const char *dir, int mntflags)
{

#if 1
	/* XXXkludgehere */
	/* kauth doesn't provide this service any longer */
	if (geteuid() != 0)
		mntflags |= MNT_NOSUID | MNT_NODEV;
#endif

	if (mount(MOUNT_PUFFS, dir, mntflags, &pu->pu_kargs) == -1)
		return -1;
	pu->pu_state = PUFFS_STATE_MOUNTING;

	return 0;
}

struct puffs_usermount *
_puffs_init(int develv, struct puffs_ops *pops, const char *puffsname,
	void *priv, uint32_t pflags)
{
	struct puffs_usermount *pu;
	struct puffs_kargs *pargs;
	int fd;

	if (develv != PUFFS_DEVEL_LIBVERSION) {
		warnx("puffs_mount: mounting with lib version %d, need %d",
		    develv, PUFFS_DEVEL_LIBVERSION);
		errno = EINVAL;
		return NULL;
	}

	fd = open("/dev/puffs", O_RDONLY);
	if (fd == -1)
		return NULL;
	if (fd <= 2)
		warnx("puffs_mount: device fd %d (<= 2), sure this is "
		    "what you want?", fd);

	pu = malloc(sizeof(struct puffs_usermount));
	if (pu == NULL)
		goto failfree;

	pargs = &pu->pu_kargs;
	memset(pargs, 0, sizeof(struct puffs_kargs));
	pargs->pa_vers = PUFFSDEVELVERS | PUFFSVERSION;
	pargs->pa_flags = PUFFS_FLAG_KERN(pflags);
	pargs->pa_fd = fd;
	fillvnopmask(pops, pargs->pa_vnopmask);
	(void)strlcpy(pargs->pa_name, puffsname, sizeof(pargs->pa_name));

	pu->pu_flags = pflags;
	pu->pu_ops = *pops;
	free(pops); /* XXX */

	pu->pu_privdata = priv;
	pu->pu_cc_stacksize = PUFFS_CC_STACKSIZE_DEFAULT;
	LIST_INIT(&pu->pu_pnodelst);

	/* defaults for some user-settable translation functions */
	pu->pu_cmap = NULL; /* identity translation */

	pu->pu_pathbuild = puffs_stdpath_buildpath;
	pu->pu_pathfree = puffs_stdpath_freepath;
	pu->pu_pathcmp = puffs_stdpath_cmppath;
	pu->pu_pathtransform = NULL;
	pu->pu_namemod = NULL;

	pu->pu_state = PUFFS_STATE_BEFOREMOUNT;

	return pu;

 failfree:
	/* can't unmount() from here for obvious reasons */
	close(fd);
	free(pu);
	return NULL;
}

struct puffs_usermount *
_puffs_mount(int develv, struct puffs_ops *pops, const char *dir, int mntflags,
	const char *puffsname, void *priv, uint32_t pflags)
{
	struct puffs_usermount *pu;
	int sverrno;

	pu = _puffs_init(develv, pops, puffsname, priv, pflags);
	if (pu == NULL)
		return NULL;

	if (puffs_domount(pu, dir, mntflags) == -1) {
		sverrno = errno;
		puffs_exit(pu, 1);
		errno = sverrno;
		return NULL;
	}

	return pu;
}

int
puffs_start(struct puffs_usermount *pu, void *rootcookie, struct statvfs *sbp)
{
	struct puffs_startreq sreq;

	memset(&sreq, 0, sizeof(struct puffs_startreq));
	sreq.psr_cookie = rootcookie;
	sreq.psr_sb = *sbp;

	/* tell kernel we're flying */
	if (ioctl(pu->pu_kargs.pa_fd, PUFFSSTARTOP, &sreq) == -1)
		return -1;

	pu->pu_state = PUFFS_STATE_RUNNING;

	return 0;
}

/*
 * XXX: there's currently no clean way to request unmount from
 * within the user server, so be very brutal about it.
 */
/*ARGSUSED1*/
int
puffs_exit(struct puffs_usermount *pu, int force)
{
	struct puffs_node *pn, *pn_next;

	force = 1; /* currently */

	if (pu->pu_kargs.pa_fd)
		close(pu->pu_kargs.pa_fd);

	pn = LIST_FIRST(&pu->pu_pnodelst);
	while (pn) {
		pn_next = LIST_NEXT(pn, pn_entries);
		puffs_pn_put(pn);
		pn = pn_next;
	}
	free(pu);

	return 0; /* always succesful for now, WILL CHANGE */
}

int
puffs_mainloop(struct puffs_usermount *pu, int flags)
{
	struct puffs_getreq *pgr;
	struct puffs_putreq *ppr;
	int rv;

	rv = -1;
	pgr = puffs_req_makeget(pu, puffs_getmaxreqlen(pu), 0);
	if (pgr == NULL)
		return -1;

	ppr = puffs_req_makeput(pu);
	if (ppr == NULL) {
		puffs_req_destroyget(pgr);
		return -1;
	}

	if ((flags & PUFFSLOOP_NODAEMON) == 0)
		if (daemon(1, 0) == -1)
			goto out;

	/* XXX: should be a bit more robust with errors here */
	while (puffs_getstate(pu) == PUFFS_STATE_RUNNING
	    || puffs_getstate(pu) == PUFFS_STATE_UNMOUNTING) {
		puffs_req_resetput(ppr);

		if (puffs_req_handle(pu, pgr, ppr, 0) == -1) {
			rv = -1;
			break;
		}
		if (puffs_req_putput(ppr) == -1) {
			rv = -1;
			break;
		}
	}

 out:
	puffs_req_destroyput(ppr);
	puffs_req_destroyget(pgr);
	return rv;
}

int
puffs_dopreq(struct puffs_usermount *pu, struct puffs_req *preq,
	struct puffs_putreq *ppr)
{
	struct puffs_cc *pcc;
	int rv;

	/*
	 * XXX: the structure is currently a mess.  anyway, trap
	 * the cacheops here already, since they don't need a cc.
	 * I really should get around to revamping the operation
	 * dispatching code one of these days.
	 */
	if (PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_CACHE) {
		struct puffs_cacheinfo *pci = (void *)preq;

		if (pu->pu_ops.puffs_cache_write == NULL)
			return 0;

		pu->pu_ops.puffs_cache_write(pu, preq->preq_cookie,
		    pci->pcache_nruns, pci->pcache_runs);
	}

	if (pu->pu_flags & PUFFS_FLAG_OPDUMP)
		puffsdump_req(preq);

	pcc = puffs_cc_create(pu);

	/* XXX: temporary kludging */
	pcc->pcc_preq = malloc(preq->preq_buflen);
	if (pcc->pcc_preq == NULL)
		return -1;
	(void) memcpy(pcc->pcc_preq, preq, preq->preq_buflen);

	rv = puffs_docc(pcc, ppr);

	if ((pcc->pcc_flags & PCC_DONE) == 0)
		return 0;

	return rv;
}

enum {PUFFCALL_ANSWER, PUFFCALL_IGNORE, PUFFCALL_AGAIN};

int
puffs_docc(struct puffs_cc *pcc, struct puffs_putreq *ppr)
{
	struct puffs_usermount *pu = pcc->pcc_pu;
	int rv;

	assert((pcc->pcc_flags & PCC_DONE) == 0);

	puffs_cc_continue(pcc);
	rv = pcc->pcc_rv;

	if ((pcc->pcc_flags & PCC_DONE) == 0)
		rv = PUFFCALL_AGAIN;

	/* check if we need to store this reply */
	switch (rv) {
	case PUFFCALL_ANSWER:
		if (pu->pu_flags & PUFFS_FLAG_OPDUMP)
			puffsdump_rv(pcc->pcc_preq);

		puffs_req_putcc(ppr, pcc);
		break;
	case PUFFCALL_IGNORE:
		puffs_cc_destroy(pcc);
		break;
	case PUFFCALL_AGAIN:
		break;
	default:
		assert(/*CONSTCOND*/0);
	}

	return 0;
}

/* library private, but linked from callcontext.c */

void
puffs_calldispatcher(struct puffs_cc *pcc)
{
	struct puffs_usermount *pu = pcc->pcc_pu;
	struct puffs_ops *pops = &pu->pu_ops;
	struct puffs_req *preq = pcc->pcc_preq;
	void *auxbuf = preq; /* help with typecasting */
	void *opcookie = preq->preq_cookie;
	int error, rv, buildpath;

	assert(pcc->pcc_flags & (PCC_ONCE | PCC_REALCC));

	if (PUFFSOP_WANTREPLY(preq->preq_opclass))
		rv = PUFFCALL_ANSWER;
	else
		rv = PUFFCALL_IGNORE;

	buildpath = pu->pu_flags & PUFFS_FLAG_BUILDPATH;
	preq->preq_setbacks = 0;

	if (PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_VFS) {
		switch (preq->preq_optype) {
		case PUFFS_VFS_UNMOUNT:
		{
			struct puffs_vfsreq_unmount *auxt = auxbuf;

			pu->pu_state = PUFFS_STATE_UNMOUNTING;
			error = pops->puffs_fs_unmount(pcc,
			    auxt->pvfsr_flags, auxt->pvfsr_pid);
			if (!error)
				pu->pu_state = PUFFS_STATE_UNMOUNTED;
			else
				pu->pu_state = PUFFS_STATE_RUNNING;
			break;
		}

		case PUFFS_VFS_STATVFS:
		{
			struct puffs_vfsreq_statvfs *auxt = auxbuf;

			error = pops->puffs_fs_statvfs(pcc,
			    &auxt->pvfsr_sb, auxt->pvfsr_pid);
			break;
		}

		case PUFFS_VFS_SYNC:
		{
			struct puffs_vfsreq_sync *auxt = auxbuf;

			error = pops->puffs_fs_sync(pcc,
			    auxt->pvfsr_waitfor, &auxt->pvfsr_cred,
			    auxt->pvfsr_pid);
			break;
		}

		case PUFFS_VFS_FHTOVP:
		{
			struct puffs_vfsreq_fhtonode *auxt = auxbuf;

			error = pops->puffs_fs_fhtonode(pcc, auxt->pvfsr_data,
			    auxt->pvfsr_dsize, &auxt->pvfsr_fhcookie,
			    &auxt->pvfsr_vtype, &auxt->pvfsr_size,
			    &auxt->pvfsr_rdev);

			break;
		}

		case PUFFS_VFS_VPTOFH:
		{
			struct puffs_vfsreq_nodetofh *auxt = auxbuf;

			error = pops->puffs_fs_nodetofh(pcc,
			    auxt->pvfsr_fhcookie, auxt->pvfsr_data,
			    &auxt->pvfsr_dsize);

			break;
		}

		case PUFFS_VFS_SUSPEND:
		{
			struct puffs_vfsreq_suspend *auxt = auxbuf;

			error = 0;
			if (pops->puffs_fs_suspend == NULL)
				break;

			pops->puffs_fs_suspend(pcc, auxt->pvfsr_status);
			break;
		}

		default:
			/*
			 * I guess the kernel sees this one coming
			 */
			error = EINVAL;
			break;
		}

	/* XXX: audit return values */
	/* XXX: sync with kernel */
	} else if (PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_VN) {
		switch (preq->preq_optype) {
		case PUFFS_VN_LOOKUP:
		{
			struct puffs_vnreq_lookup *auxt = auxbuf;
			struct puffs_cn pcn;

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			/* lookup *must* be present */
			error = pops->puffs_node_lookup(pcc, opcookie,
			    &auxt->pvnr_newnode, &auxt->pvnr_vtype,
			    &auxt->pvnr_size, &auxt->pvnr_rdev, &pcn);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu, &pcn.pcn_po_full);
				} else {
					struct puffs_node *pn;

					/*
					 * did we get a new node or a
					 * recycled node?
					 */
					pn = PU_CMAP(pu, auxt->pvnr_newnode);
					if (pn->pn_po.po_path == NULL)
						pn->pn_po = pcn.pcn_po_full;
					else
						pu->pu_pathfree(pu,
						    &pcn.pcn_po_full);
				}
			}

			break;
		}

		case PUFFS_VN_CREATE:
		{
			struct puffs_vnreq_create *auxt = auxbuf;
			struct puffs_cn pcn;
			if (pops->puffs_node_create == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			error = pops->puffs_node_create(pcc,
			    opcookie, &auxt->pvnr_newnode,
			    &pcn, &auxt->pvnr_va);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu, &pcn.pcn_po_full);
				} else {
					struct puffs_node *pn;

					pn = PU_CMAP(pu, auxt->pvnr_newnode);
					pn->pn_po = pcn.pcn_po_full;
				}
			}

			break;
		}

		case PUFFS_VN_MKNOD:
		{
			struct puffs_vnreq_mknod *auxt = auxbuf;
			struct puffs_cn pcn;
			if (pops->puffs_node_mknod == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			error = pops->puffs_node_mknod(pcc,
			    opcookie, &auxt->pvnr_newnode,
			    &pcn, &auxt->pvnr_va);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu, &pcn.pcn_po_full);
				} else {
					struct puffs_node *pn;

					pn = PU_CMAP(pu, auxt->pvnr_newnode);
					pn->pn_po = pcn.pcn_po_full;
				}
			}

			break;
		}

		case PUFFS_VN_OPEN:
		{
			struct puffs_vnreq_open *auxt = auxbuf;
			if (pops->puffs_node_open == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_open(pcc,
			    opcookie, auxt->pvnr_mode,
			    &auxt->pvnr_cred, auxt->pvnr_pid);
			break;
		}

		case PUFFS_VN_CLOSE:
		{
			struct puffs_vnreq_close *auxt = auxbuf;
			if (pops->puffs_node_close == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_close(pcc,
			    opcookie, auxt->pvnr_fflag,
			    &auxt->pvnr_cred, auxt->pvnr_pid);
			break;
		}

		case PUFFS_VN_ACCESS:
		{
			struct puffs_vnreq_access *auxt = auxbuf;
			if (pops->puffs_node_access == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_access(pcc,
			    opcookie, auxt->pvnr_mode,
			    &auxt->pvnr_cred, auxt->pvnr_pid);
			break;
		}

		case PUFFS_VN_GETATTR:
		{
			struct puffs_vnreq_getattr *auxt = auxbuf;
			if (pops->puffs_node_getattr == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			error = pops->puffs_node_getattr(pcc,
			    opcookie, &auxt->pvnr_va,
			    &auxt->pvnr_cred, auxt->pvnr_pid);
			break;
		}

		case PUFFS_VN_SETATTR:
		{
			struct puffs_vnreq_setattr *auxt = auxbuf;
			if (pops->puffs_node_setattr == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			error = pops->puffs_node_setattr(pcc,
			    opcookie, &auxt->pvnr_va,
			    &auxt->pvnr_cred, auxt->pvnr_pid);
			break;
		}

		case PUFFS_VN_MMAP:
		{
			struct puffs_vnreq_mmap *auxt = auxbuf;
			if (pops->puffs_node_mmap == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_mmap(pcc,
			    opcookie, auxt->pvnr_fflags,
			    &auxt->pvnr_cred, auxt->pvnr_pid);
			break;
		}

		case PUFFS_VN_FSYNC:
		{
			struct puffs_vnreq_fsync *auxt = auxbuf;
			if (pops->puffs_node_fsync == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_fsync(pcc,
			    opcookie, &auxt->pvnr_cred,
			    auxt->pvnr_flags, auxt->pvnr_offlo,
			    auxt->pvnr_offhi, auxt->pvnr_pid);
			break;
		}

		case PUFFS_VN_SEEK:
		{
			struct puffs_vnreq_seek *auxt = auxbuf;
			if (pops->puffs_node_seek == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_seek(pcc,
			    opcookie, auxt->pvnr_oldoff,
			    auxt->pvnr_newoff, &auxt->pvnr_cred);
			break;
		}

		case PUFFS_VN_REMOVE:
		{
			struct puffs_vnreq_remove *auxt = auxbuf;
			struct puffs_cn pcn;
			if (pops->puffs_node_remove == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;

			error = pops->puffs_node_remove(pcc,
			    opcookie, auxt->pvnr_cookie_targ, &pcn);
			break;
		}

		case PUFFS_VN_LINK:
		{
			struct puffs_vnreq_link *auxt = auxbuf;
			struct puffs_cn pcn;
			if (pops->puffs_node_link == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			error = pops->puffs_node_link(pcc,
			    opcookie, auxt->pvnr_cookie_targ, &pcn);
			if (buildpath)
				pu->pu_pathfree(pu, &pcn.pcn_po_full);

			break;
		}

		case PUFFS_VN_RENAME:
		{
			struct puffs_vnreq_rename *auxt = auxbuf;
			struct puffs_cn pcn_src, pcn_targ;
			struct puffs_node *pn_src;

			if (pops->puffs_node_rename == NULL) {
				error = 0;
				break;
			}

			pcn_src.pcn_pkcnp = &auxt->pvnr_cn_src;
			pcn_targ.pcn_pkcnp = &auxt->pvnr_cn_targ;
			if (buildpath) {
				pn_src = auxt->pvnr_cookie_src;
				pcn_src.pcn_po_full = pn_src->pn_po;

				error = puffs_path_pcnbuild(pu, &pcn_targ,
				    auxt->pvnr_cookie_targdir);
				if (error)
					break;
			}

			error = pops->puffs_node_rename(pcc,
			    opcookie, auxt->pvnr_cookie_src,
			    &pcn_src, auxt->pvnr_cookie_targdir,
			    auxt->pvnr_cookie_targ, &pcn_targ);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu,
					    &pcn_targ.pcn_po_full);
				} else {
					struct puffs_pathinfo pi;
					struct puffs_pathobj po_old;

					/* handle this node */
					po_old = pn_src->pn_po;
					pn_src->pn_po = pcn_targ.pcn_po_full;

					if (pn_src->pn_va.va_type != VDIR) {
						pu->pu_pathfree(pu, &po_old);
						break;
					}

					/* handle all child nodes for DIRs */
					pi.pi_old = &pcn_src.pcn_po_full;
					pi.pi_new = &pcn_targ.pcn_po_full;

					if (puffs_pn_nodewalk(pu,
					    puffs_path_prefixadj, &pi) != NULL)
						error = ENOMEM;
					pu->pu_pathfree(pu, &po_old);
				}
			}
			break;
		}

		case PUFFS_VN_MKDIR:
		{
			struct puffs_vnreq_mkdir *auxt = auxbuf;
			struct puffs_cn pcn;
			if (pops->puffs_node_mkdir == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			error = pops->puffs_node_mkdir(pcc,
			    opcookie, &auxt->pvnr_newnode,
			    &pcn, &auxt->pvnr_va);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu, &pcn.pcn_po_full);
				} else {
					struct puffs_node *pn;

					pn = PU_CMAP(pu, auxt->pvnr_newnode);
					pn->pn_po = pcn.pcn_po_full;
				}
			}

			break;
		}

		case PUFFS_VN_RMDIR:
		{
			struct puffs_vnreq_rmdir *auxt = auxbuf;
			struct puffs_cn pcn;
			if (pops->puffs_node_rmdir == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;

			error = pops->puffs_node_rmdir(pcc,
			    opcookie, auxt->pvnr_cookie_targ, &pcn);
			break;
		}

		case PUFFS_VN_SYMLINK:
		{
			struct puffs_vnreq_symlink *auxt = auxbuf;
			struct puffs_cn pcn;
			if (pops->puffs_node_symlink == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			error = pops->puffs_node_symlink(pcc,
			    opcookie, &auxt->pvnr_newnode,
			    &pcn, &auxt->pvnr_va, auxt->pvnr_link);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu, &pcn.pcn_po_full);
				} else {
					struct puffs_node *pn;

					pn = PU_CMAP(pu, auxt->pvnr_newnode);
					pn->pn_po = pcn.pcn_po_full;
				}
			}

			break;
		}

		case PUFFS_VN_READDIR:
		{
			struct puffs_vnreq_readdir *auxt = auxbuf;
			struct dirent *dent;
			off_t *cookies;
			size_t res, origcookies;

			if (pops->puffs_node_readdir == NULL) {
				error = 0;
				break;
			}

			if (auxt->pvnr_ncookies) {
				/* LINTED: pvnr_data is __aligned() */
				cookies = (off_t *)auxt->pvnr_data;
				origcookies = auxt->pvnr_ncookies;
			} else {
				cookies = NULL;
				origcookies = 0;
			}
			/* LINTED: dentoff is aligned in the kernel */
			dent = (struct dirent *)
			    (auxt->pvnr_data + auxt->pvnr_dentoff);

			res = auxt->pvnr_resid;
			error = pops->puffs_node_readdir(pcc,
			    opcookie, dent, &auxt->pvnr_offset,
			    &auxt->pvnr_resid, &auxt->pvnr_cred,
			    &auxt->pvnr_eofflag, cookies, &auxt->pvnr_ncookies);

			/* much easier to track non-working NFS */
			assert(auxt->pvnr_ncookies <= origcookies);

			/* need to move a bit more */
			preq->preq_buflen = sizeof(struct puffs_vnreq_readdir) 
			    + auxt->pvnr_dentoff + (res - auxt->pvnr_resid);
			break;
		}

		case PUFFS_VN_READLINK:
		{
			struct puffs_vnreq_readlink *auxt = auxbuf;
			if (pops->puffs_node_readlink == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			error = pops->puffs_node_readlink(pcc,
			    opcookie, &auxt->pvnr_cred,
			    auxt->pvnr_link, &auxt->pvnr_linklen);
			break;
		}

		case PUFFS_VN_RECLAIM:
		{
			struct puffs_vnreq_reclaim *auxt = auxbuf;
			if (pops->puffs_node_reclaim == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_reclaim(pcc,
			    opcookie, auxt->pvnr_pid);
			break;
		}

		case PUFFS_VN_INACTIVE:
		{
			struct puffs_vnreq_inactive *auxt = auxbuf;
			if (pops->puffs_node_inactive == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			error = pops->puffs_node_inactive(pcc,
			    opcookie, auxt->pvnr_pid,
			    &auxt->pvnr_backendrefs);
			break;
		}

		case PUFFS_VN_PATHCONF:
		{
			struct puffs_vnreq_pathconf *auxt = auxbuf;
			if (pops->puffs_node_pathconf == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_pathconf(pcc,
			    opcookie, auxt->pvnr_name,
			    &auxt->pvnr_retval);
			break;
		}

		case PUFFS_VN_ADVLOCK:
		{
			struct puffs_vnreq_advlock *auxt = auxbuf;
			if (pops->puffs_node_advlock == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_advlock(pcc,
			    opcookie, auxt->pvnr_id, auxt->pvnr_op,
			    &auxt->pvnr_fl, auxt->pvnr_flags);
			break;
		}

		case PUFFS_VN_PRINT:
		{
			if (pops->puffs_node_print == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_print(pcc,
			    opcookie);
			break;
		}

		case PUFFS_VN_READ:
		{
			struct puffs_vnreq_read *auxt = auxbuf;
			size_t res;

			if (pops->puffs_node_read == NULL) {
				error = EIO;
				break;
			}

			res = auxt->pvnr_resid;
			error = pops->puffs_node_read(pcc,
			    opcookie, auxt->pvnr_data,
			    auxt->pvnr_offset, &auxt->pvnr_resid,
			    &auxt->pvnr_cred, auxt->pvnr_ioflag);

			/* need to move a bit more */
			preq->preq_buflen = sizeof(struct puffs_vnreq_read)
			    + (res - auxt->pvnr_resid);
			break;
		}

		case PUFFS_VN_WRITE:
		{
			struct puffs_vnreq_write *auxt = auxbuf;

			if (pops->puffs_node_write == NULL) {
				error = EIO;
				break;
			}

			error = pops->puffs_node_write(pcc,
			    opcookie, auxt->pvnr_data,
			    auxt->pvnr_offset, &auxt->pvnr_resid,
			    &auxt->pvnr_cred, auxt->pvnr_ioflag);

			/* don't need to move data back to the kernel */
			preq->preq_buflen = sizeof(struct puffs_vnreq_write);
			break;
		}

/* holy bitrot, ryydman! */
#if 0
		case PUFFS_VN_IOCTL:
			error = pops->puffs_node_ioctl1(pcc, opcookie,
			     (struct puffs_vnreq_ioctl *)auxbuf, &pop);
			if (error != 0)
				break;
			pop.pso_reqid = preq->preq_id;

			/* let the kernel do it's intermediate duty */
			error = ioctl(pu->pu_kargs.pa_fd, PUFFSSIZEOP, &pop);
			/*
			 * XXX: I don't actually know what the correct
			 * thing to do in case of an error is, so I'll
			 * just ignore it for the time being.
			 */
			error = pops->puffs_node_ioctl2(pcc, opcookie,
			    (struct puffs_vnreq_ioctl *)auxbuf, &pop);
			break;

		case PUFFS_VN_FCNTL:
			error = pops->puffs_node_fcntl1(pcc, opcookie,
			     (struct puffs_vnreq_fcntl *)auxbuf, &pop);
			if (error != 0)
				break;
			pop.pso_reqid = preq->preq_id;

			/* let the kernel do it's intermediate duty */
			error = ioctl(pu->pu_kargs.pa_fd, PUFFSSIZEOP, &pop);
			/*
			 * XXX: I don't actually know what the correct
			 * thing to do in case of an error is, so I'll
			 * just ignore it for the time being.
			 */
			error = pops->puffs_node_fcntl2(pcc, opcookie,
			    (struct puffs_vnreq_fcntl *)auxbuf, &pop);
			break;
#endif

		default:
			printf("inval op %d\n", preq->preq_optype);
			error = EINVAL;
			break;
		}
	} else {
		/*
		 * this one also
		 */
		error = EINVAL;
	}

	preq->preq_rv = error;

	pcc->pcc_rv = rv;
	pcc->pcc_flags |= PCC_DONE;
}


#if 0
		case PUFFS_VN_POLL:
		{
			struct puffs_vnreq_poll *auxt = auxbuf;
			if (pops->puffs_node_poll == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_poll(pcc,
			    opcookie, preq-);
			break;
		}

		case PUFFS_VN_KQFILTER:
		{
			struct puffs_vnreq_kqfilter *auxt = auxbuf;
			if (pops->puffs_node_kqfilter == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_kqfilter(pcc,
			    opcookie, );
			break;
		}

		case PUFFS_VN_CLOSEEXTATTR:
		{
			struct puffs_vnreq_closeextattr *auxt = auxbuf;
			if (pops->puffs_closeextattr == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_closeextattr(pcc,
			    opcookie, );
			break;
		}

		case PUFFS_VN_GETEXTATTR:
		{
			struct puffs_vnreq_getextattr *auxt = auxbuf;
			if (pops->puffs_getextattr == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_getextattr(pcc,
			    opcookie, );
			break;
		}

		case PUFFS_VN_LISTEXTATTR:
		{
			struct puffs_vnreq_listextattr *auxt = auxbuf;
			if (pops->puffs_listextattr == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_listextattr(pcc,
			    opcookie, );
			break;
		}

		case PUFFS_VN_OPENEXTATTR:
		{
			struct puffs_vnreq_openextattr *auxt = auxbuf;
			if (pops->puffs_openextattr == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_openextattr(pcc,
			    opcookie, );
			break;
		}

		case PUFFS_VN_DELETEEXTATTR:
		{
			struct puffs_vnreq_deleteextattr *auxt = auxbuf;
			if (pops->puffs_deleteextattr == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_deleteextattr(pcc,
			    opcookie, );
			break;
		}

		case PUFFS_VN_SETEXTATTR:
		{
			struct puffs_vnreq_setextattr *auxt = auxbuf;
			if (pops->puffs_setextattr == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_setextattr(pcc,
			    opcookie, );
			break;
		}

#endif