xref: /src/lib/libperfuse/ops.c

/*  $NetBSD: ops.c,v 1.5 2010/09/01 14:57:24 manu Exp $ */

/*-
 *  Copyright (c) 2010 Emmanuel Dreyfus. All rights reserved.
 *
 *  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.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 *  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 *  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 *  PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION 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 <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <libgen.h>
#include <errno.h>
#include <err.h>
#include <sysexits.h>
#include <syslog.h>
#include <puffs.h>
#include <sys/vnode.h>
#include <sys/socket.h>
#include <machine/vmparam.h>

#include "perfuse_priv.h"
#include "fuse.h"

static int no_access(puffs_cookie_t, const struct puffs_cred *, mode_t);
static void fuse_attr_to_vap(struct perfuse_state *,
    struct vattr *, struct fuse_attr *);
static int node_lookup_dir_nodot(struct puffs_usermount *,
    puffs_cookie_t, char *, size_t, struct puffs_node **);
static int node_lookup_common(struct puffs_usermount *, puffs_cookie_t,
    const char*, struct puffs_node **);
static int node_mk_common(struct puffs_usermount *, puffs_cookie_t,
    struct puffs_newinfo *, const struct puffs_cn *pcn,
    const struct vattr *, perfuse_msg_t *);
static const char *basename_r(const char *);
static ssize_t fuse_to_dirent(struct puffs_usermount *, puffs_cookie_t,
    struct fuse_dirent *, size_t);
static int readdir_buffered(struct perfuse_state *, puffs_cookie_t,
    struct dirent *, off_t *, size_t *, const struct puffs_cred *,
    int *, off_t *, size_t *);
static void requeue_request(struct puffs_usermount *,
    puffs_cookie_t opc, enum perfuse_qtype);
static void dequeue_requests(struct perfuse_state *,
     puffs_cookie_t opc, enum perfuse_qtype, int);
#define DEQUEUE_ALL 0

/*
 *  From <sys/vnode>, inside #ifdef _KERNEL section
 */
#define IO_SYNC		(0x40|IO_DSYNC)
#define IO_DSYNC	0x00200
#define IO_DIRECT	0x02000

/*
 *  From <fcntl>, inside #ifdef _KERNEL section
 */
#define F_WAIT		0x010
#define F_FLOCK		0x020

/*
 * Borrowed from src/sys/kern/vfs_subr.c and src/sys/sys/vnode.h
 */
const enum vtype iftovt_tab[16] = {
	VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
        VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
};
const int vttoif_tab[9] = {
	0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK,
        S_IFSOCK, S_IFIFO, S_IFMT,
};

#define IFTOVT(mode) (iftovt_tab[((mode) & S_IFMT) >> 12])
#define VTTOIF(indx) (vttoif_tab[(int)(indx)])


static int
no_access(opc, pcr, mode)
	puffs_cookie_t opc;
	const struct puffs_cred *pcr;
	mode_t mode;
{
	struct puffs_node *pn;
	struct vattr *va;

	pn = (struct puffs_node *)opc;
	va = puffs_pn_getvap(pn);

	return puffs_access(va->va_type, va->va_mode,
			    va->va_uid, va->va_gid,
			    mode, pcr);
}

static void
fuse_attr_to_vap(ps, vap, fa)
	struct perfuse_state *ps;
	struct vattr *vap;
	struct fuse_attr *fa;
{
	vap->va_type = IFTOVT(fa->mode);
	vap->va_mode = fa->mode;
	vap->va_nlink = fa->nlink;
	vap->va_uid = fa->uid;
	vap->va_gid = fa->gid;
	vap->va_fsid = ps->ps_fsid;
	vap->va_fileid = fa->ino;
	vap->va_size = fa->size;
	vap->va_blocksize = fa->blksize;
	vap->va_atime.tv_sec = (time_t)fa->atime;
	vap->va_atime.tv_nsec = (long) fa->atimensec;
	vap->va_mtime.tv_sec = (time_t)fa->mtime;
	vap->va_mtime.tv_nsec = (long)fa->mtimensec;
	vap->va_ctime.tv_sec = (time_t)fa->ctime;
	vap->va_ctime.tv_nsec = (long)fa->ctimensec;
	vap->va_birthtime.tv_sec = 0;
	vap->va_birthtime.tv_nsec = 0;
	vap->va_gen = 0;
	vap->va_flags = 0;
	vap->va_rdev = fa->rdev;
	vap->va_bytes = fa->size;
	vap->va_filerev = 0;
	vap->va_vaflags = 0;

	if (vap->va_blocksize == 0)
		vap->va_blocksize = DEV_BSIZE;

	if (vap->va_size == (size_t)-1) /* XXX */
		vap->va_size = 0;

	return;
}


/*
 * Lookup name in directory opc
 * We take special care of name being . or ..
 * These are returned by readdir and deserve tweaks.
 */
static int
node_lookup_dir_nodot(pu, opc, name, namelen, pnp)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	char *name;
	size_t namelen;
	struct puffs_node **pnp;
{
	char *path;
	struct puffs_node *dpn = (struct puffs_node *)opc;
	int error;

	/*
	 *  is easy as we already know it
	 */
	if (strncmp(name, ".", namelen) == 0) {
		*pnp = (struct puffs_node *)opc;
		return 0;
	}

	/*
	 * For .. we just forget the name part
	 */
	if (strncmp(name, "..", namelen) == 0)
		namelen = 0;

	namelen = PNPLEN(dpn) + 1 + namelen + 1;
	if ((path = malloc(namelen)) == NULL)
		DERR(EX_OSERR, "malloc failed");
	(void)snprintf(path, namelen, "%s/%s", (char *)PNPATH(dpn), name);

	error = node_lookup_common(pu, opc, path, pnp);

	free(path);

	return error;
}

static int
node_lookup_common(pu, opc, path, pnp)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	const char *path;
	struct puffs_node **pnp;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	struct fuse_entry_out *feo;
	struct puffs_node *pn;
	size_t len;
	int error;

	ps = puffs_getspecific(pu);

	path = basename_r(path);
	len = strlen(path) + 1;

	pm = ps->ps_new_msg(pu, opc, FUSE_LOOKUP, len, NULL);
	(void)strlcpy(_GET_INPAYLOAD(ps, pm, char *), path, len);

	if ((error = XCHG_MSG(ps, pu, pm, sizeof(*feo))) != 0)
		goto out;

	feo = GET_OUTPAYLOAD(ps, pm, fuse_entry_out);

	pn = perfuse_new_pn(pu, opc);
	PERFUSE_NODE_DATA(pn)->pnd_ino = feo->nodeid;

	fuse_attr_to_vap(ps, &pn->pn_va, &feo->attr);

	if (pnp != NULL)
		*pnp = pn;

out:
	ps->ps_destroy_msg(pm);

	return error;
}


/*
 * Common final code for methods that create objects:
 * perfuse_node_mkdir
 * perfuse_node_mknod
 * perfuse_node_symlink
 */
static int
node_mk_common(pu, opc, pni, pcn, vap, pm)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	struct puffs_newinfo *pni;
	const struct puffs_cn *pcn;
	const struct vattr *vap;
	perfuse_msg_t *pm;
{
	struct perfuse_state *ps;
	struct puffs_node *pn;
	struct fuse_entry_out *feo;
	struct fuse_setattr_in *fsi;
	int error;

	ps =  puffs_getspecific(pu);

	if ((error = XCHG_MSG(ps, pu, pm, sizeof(*feo))) != 0)
		goto out;

	feo = GET_OUTPAYLOAD(ps, pm, fuse_entry_out);
	if (feo->nodeid == PERFUSE_UNKNOWN_INO)
		DERRX(EX_SOFTWARE, "%s: no ino", __func__);

	pn = perfuse_new_pn(pu, opc);
	PERFUSE_NODE_DATA(pn)->pnd_ino = feo->nodeid;

	fuse_attr_to_vap(ps, &pn->pn_va, &feo->attr);
	puffs_newinfo_setcookie(pni, pn);
	ps->ps_destroy_msg(pm);

	/*
	 * Set owner and group
	 */
	(void)puffs_cred_getuid(pcn->pcn_cred, &pn->pn_va.va_uid);
	(void)puffs_cred_getgid(pcn->pcn_cred, &pn->pn_va.va_gid);

	pm = ps->ps_new_msg(pu, (puffs_cookie_t)pn,
			    FUSE_SETATTR, sizeof(*fsi), NULL);
	fsi = GET_INPAYLOAD(ps, pm, fuse_setattr_in);
	fsi->uid = pn->pn_va.va_uid;
	fsi->gid = pn->pn_va.va_gid;
	fsi->valid = FUSE_FATTR_UID|FUSE_FATTR_GID;

	/*
	 * A fuse_attr_out is returned, but we ignore it.
	 */
	error = XCHG_MSG(ps, pu, pm, sizeof(struct fuse_attr_out));

out:
	ps->ps_destroy_msg(pm);

	return error;
}

static const char *
basename_r(string)
	const char *string;
{
	char *result;

	if ((result = rindex(string, '/')) == NULL)
		return string;

	/*
	 * We are finished if this is not a trailing /
	 */
	if (result[1] != '\0')
		return result + 1;


	/*
	 * Go back until we found something else than a /
	 */
	while (result != string) {
		result--;
		if (result[0] != '/')
			break;
	}

	if (result == string)
		return string;

	if ((result = rindex(string, '/')) == NULL)
		return string;

	return result + 1;

}

static ssize_t
fuse_to_dirent(pu, opc, fd, fd_len)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	struct fuse_dirent *fd;
	size_t fd_len;
{
	struct dirent *dents;
	size_t dents_len;
	ssize_t written;
	uint64_t fd_offset;
	struct fuse_dirent *fd_base;
	size_t len;

	fd_base = fd;
	fd_offset = 0;
	written = 0;
	dents = PERFUSE_NODE_DATA(opc)->pnd_dirent;
	dents_len = PERFUSE_NODE_DATA(opc)->pnd_dirent_len;

	do {
		char *ndp;
		size_t reclen;

		reclen = _DIRENT_RECLEN(dents, fd->namelen);

		/*
		 * Check we do not overflow the output buffer
		 * struct fuse_dirent is bigger than struct dirent,
		 * so we should always use fd_len and never reallocate
		 * later.
		 * If we have to reallocate,try to double the buffer
		 * each time so that we do not have to do it too often.
		 */
		if (written + reclen > dents_len) {
			if (dents_len == 0)
				dents_len = fd_len;
			else
				dents_len =
				   MAX(2 * dents_len, written + reclen);

			dents = PERFUSE_NODE_DATA(opc)->pnd_dirent;
			if ((dents = realloc(dents, dents_len)) == NULL)
				DERR(EX_OSERR, "malloc failed");

			PERFUSE_NODE_DATA(opc)->pnd_dirent = dents;
			PERFUSE_NODE_DATA(opc)->pnd_dirent_len = dents_len;

			/*
			 * (void *) for delint
			 */
			ndp = (char *)(void *)dents + written;
			dents = (struct dirent *)(void *)ndp;
		}



		/*
		 * Filesystem was mounted without -o use_ino
		 * Perform a lookup to find it.
		 * XXX still broken
		 */
		if (fd->ino == PERFUSE_UNKNOWN_INO) {
			struct puffs_node *pn;

			if (node_lookup_dir_nodot(pu, opc, fd->name,
						  fd->namelen, &pn) != 0)
				DERRX(EX_SOFTWARE,
				     "node_lookup_dir_nodot failed");

			fd->ino = PERFUSE_NODE_DATA(pn)->pnd_ino;
		}

		dents->d_fileno = fd->ino;
		dents->d_reclen = (unsigned short)reclen;
		dents->d_namlen = fd->namelen;
		dents->d_type = fd->type;
		strlcpy(dents->d_name, fd->name, fd->namelen + 1);

#ifdef PERFUSE_DEBUG
		if (perfuse_diagflags & PDF_READDIR)
			DPRINTF("%s: translated \"%s\" ino = %"PRId64"\n",
				__func__, dents->d_name, dents->d_fileno);
#endif

		dents = _DIRENT_NEXT(dents);
		written += reclen;

		/*
		 * Move to the next record.
		 * fd->off seems unreliable, for instance, flusterfs
		 * does not clear the unused bits, and we get
		 * 0xffffffffb9b95040 instead of just 0x40. Use
		 * record alignement instead.
		 */
		len = FUSE_DIRENT_ALIGN(sizeof(*fd) + fd->namelen);
#ifdef PERFUSE_DEBUG
		if (perfuse_diagflags & PDF_READDIR)
			DPRINTF("%s: record at %"PRId64"/0x%"PRIx64" "
				"length = %zd/0x%zx. "
				"next record at %"PRId64"/0x%"PRIx64" "
				"max %zd/0x%zx\n",
				__func__, fd_offset, fd_offset, len, len,
				fd_offset + len, fd_offset + len,
				fd_len, fd_len);
#endif
		fd_offset += len;

		/*
		 * Check if next record is still within the packet
		 * If it is not, we reached the end of the buffer.
		 */
		if (fd_offset >= fd_len)
			break;

		/*
		 * (void *) for delint
		 */
		ndp = (char *)(void *)fd_base + (size_t)fd_offset;
		fd = (struct fuse_dirent *)(void *)ndp;

	} while (1 /* CONSTCOND */);

	/*
	 * Adjust the dirent output length
	 */
	if (written != -1)
		PERFUSE_NODE_DATA(opc)->pnd_dirent_len = written;

	return written;
}

/* ARGSUSED0 */
static int
readdir_buffered(ps, opc, dent, readoff,
		     reslen, pcr, eofflag, cookies, ncookies)
	struct perfuse_state *ps;
	puffs_cookie_t opc;
	struct dirent *dent;
	off_t *readoff;
	size_t *reslen;
	const struct puffs_cred *pcr;
	int *eofflag;
	off_t *cookies;
	size_t *ncookies;
{
	struct dirent *fromdent;
	struct perfuse_node_data *pnd;
	char *ndp;

	pnd = PERFUSE_NODE_DATA(opc);

	while (*readoff < pnd->pnd_dirent_len) {
		/*
		 * (void *) for delint
		 */
		ndp = (char *)(void *)pnd->pnd_dirent + (size_t)*readoff;
		fromdent = (struct dirent *)(void *)ndp;

		if (*reslen < _DIRENT_SIZE(fromdent))
			break;

		memcpy(dent, fromdent, _DIRENT_SIZE(fromdent));
		*readoff += _DIRENT_SIZE(fromdent);
		*reslen -= _DIRENT_SIZE(fromdent);

		dent = _DIRENT_NEXT(dent);
	}

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_READDIR)
		DPRINTF("%s: readoff = %"PRId64",  pnd->pnd_dirent_len = %zd\n",
			__func__, *readoff, pnd->pnd_dirent_len);
#endif
	if (*readoff >=  pnd->pnd_dirent_len) {
		free(pnd->pnd_dirent);
		pnd->pnd_dirent = NULL;
		pnd->pnd_dirent_len = 0;
		*eofflag = 1;
	}

	return 0;
}

/* ARGSUSED0 */
static void
requeue_request(pu, opc, type)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	enum perfuse_qtype type;
{
	struct perfuse_cc_queue pcq;
	struct perfuse_node_data *pnd;
#ifdef PERFUSE_DEBUG
	struct perfuse_state *ps;

	ps = perfuse_getspecific(pu);
#endif

	/*
	 * XXX Add a lock he day we go multithreaded
	 */
	pnd = PERFUSE_NODE_DATA(opc);
	pcq.pcq_type = type;
	pcq.pcq_cc = puffs_cc_getcc(pu);
	TAILQ_INSERT_TAIL(&pnd->pnd_pcq, &pcq, pcq_next);

#ifdef PERFUSE_DEBUG

	if (perfuse_diagflags & PDF_REQUEUE)
		DPRINTF("%s: REQUEUE opc = %p, pcc = %p\n",
		       __func__, (void *)opc, pcq.pcq_cc);
#endif

	puffs_cc_yield(pcq.pcq_cc);

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_REQUEUE)
		DPRINTF("%s: RESUME opc = %p, pcc = %p\n",
		        __func__, (void *)opc, pcq.pcq_cc);
#endif

	return;
}

/* ARGSUSED0 */
static void
dequeue_requests(ps, opc, type, max)
	struct perfuse_state *ps;
	puffs_cookie_t opc;
	enum perfuse_qtype type;
	int max;
{
	struct perfuse_cc_queue *pcq;
	struct perfuse_node_data *pnd;
	int dequeued;

	/*
	 * XXX Add a lock he day we go multithreaded
	 */
	pnd = PERFUSE_NODE_DATA(opc);
	dequeued = 0;
	TAILQ_FOREACH(pcq, &pnd->pnd_pcq, pcq_next) {
		if (pcq->pcq_type != type)
			continue;

		puffs_cc_schedule(pcq->pcq_cc);
		TAILQ_REMOVE(&pnd->pnd_pcq, pcq, pcq_next);

#ifdef PERFUSE_DEBUG
		if (perfuse_diagflags & PDF_REQUEUE)
			DPRINTF("%s: SCHEDULE opc = %p, pcc = %p\n",
				__func__, (void *)opc, pcq->pcq_cc);
#endif

		if (++dequeued == max)
			break;
	}

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_REQUEUE)
		DPRINTF("%s: DONE  opc = %p\n", __func__, (void *)opc);
#endif

	return;
}

void
perfuse_fs_init(pu)
	struct puffs_usermount *pu;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	struct fuse_init_in *fii;
	struct fuse_init_out *fio;
	int error;

	ps = puffs_getspecific(pu);

        if (puffs_mount(pu, ps->ps_target, ps->ps_mountflags, ps->ps_root) != 0)
                DERR(EX_OSERR, "puffs_mount failed");

	/*
	 * Linux 2.6.34.1 sends theses flags:
	 * FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC
	 * FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK
	 *
	 * Linux also sets max_readahead at 32 pages (128 kB)
	 */
	pm = ps->ps_new_msg(pu, 0, FUSE_INIT, sizeof(*fii), NULL);
	fii = GET_INPAYLOAD(ps, pm, fuse_init_in);
	fii->major = FUSE_KERNEL_VERSION;
	fii->minor = FUSE_KERNEL_MINOR_VERSION;
	fii->max_readahead = 32 * PAGE_SIZE;
	fii->flags = (FUSE_ASYNC_READ|FUSE_POSIX_LOCKS|FUSE_ATOMIC_O_TRUNC);

	if ((error = XCHG_MSG(ps, pu, pm, sizeof(*fio))) != 0)
		DERRX(EX_SOFTWARE, "init message exchange failed (%d)", error);

	fio = GET_OUTPAYLOAD(ps, pm, fuse_init_out);
	ps->ps_max_readahead = fio->max_readahead;
	ps->ps_max_write = fio->max_write;

	ps->ps_destroy_msg(pm);

	return;
}

int
perfuse_fs_unmount(pu, flags)
	struct puffs_usermount *pu;
	int flags;
{
	perfuse_msg_t *pm;
	struct perfuse_state *ps;
	puffs_cookie_t opc;
	int error;

	ps = puffs_getspecific(pu);

	opc = (puffs_cookie_t)puffs_getroot(pu);
	pm = ps->ps_new_msg(pu, opc, FUSE_DESTROY, 0, NULL);

	if ((error = XCHG_MSG(ps, pu, pm, UNSPEC_REPLY_LEN)) != 0) {
		DWARN("unmount %s", ps->ps_target);
		if (!(flags & MNT_FORCE))
			goto out;
	}

	DPRINTF("%s unmounted, exit\n", ps->ps_target);

	exit(0);
out:
	ps->ps_destroy_msg(pm);

	return error;
}

int
perfuse_fs_statvfs(pu, svfsb)
	struct puffs_usermount *pu;
	struct statvfs *svfsb;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	puffs_cookie_t opc;
	struct fuse_statfs_out *fso;
	int error;

	ps = puffs_getspecific(pu);
	opc = (puffs_cookie_t)puffs_getroot(pu);
	pm = ps->ps_new_msg(pu, opc, FUSE_STATFS, 0, NULL);

	if ((error = XCHG_MSG(ps, pu, pm, sizeof(*fso))) != 0)
		goto out;

	fso = GET_OUTPAYLOAD(ps, pm, fuse_statfs_out);
	svfsb->f_flag = ps->ps_mountflags;
	svfsb->f_bsize = fso->st.bsize;
	svfsb->f_frsize = fso->st.frsize;
	svfsb->f_iosize = ((struct puffs_node *)opc)->pn_va.va_blocksize;
	svfsb->f_blocks = fso->st.blocks;
	svfsb->f_bfree = fso->st.bfree;
	svfsb->f_bavail = fso->st.bavail;
	svfsb->f_bresvd = fso->st.bfree - fso->st.bavail;
	svfsb->f_files = fso->st.files;
	svfsb->f_ffree = fso->st.ffree;
	svfsb->f_favail = fso->st.ffree;/* files not reserved for root */
	svfsb->f_fresvd = 0;		/* files reserved for root */

	svfsb->f_syncreads = ps->ps_syncreads;
	svfsb->f_syncwrites = ps->ps_syncwrites;

	svfsb->f_asyncreads = ps->ps_asyncreads;
	svfsb->f_asyncwrites = ps->ps_asyncwrites;

	svfsb->f_fsidx.__fsid_val[0] = (int32_t)ps->ps_fsid;
	svfsb->f_fsidx.__fsid_val[1] = 0;
	svfsb->f_fsid = ps->ps_fsid;
	svfsb->f_namemax = MAXPATHLEN;	/* XXX */
	svfsb->f_owner = ps->ps_owner_uid;

	(void)strlcpy(svfsb->f_mntonname, ps->ps_target, _VFS_NAMELEN);

	if (ps->ps_filesystemtype != NULL)
		(void)strlcpy(svfsb->f_fstypename,
			      ps->ps_filesystemtype, _VFS_NAMELEN);
	else
		(void)strlcpy(svfsb->f_fstypename, "fuse", _VFS_NAMELEN);

	if (ps->ps_source != NULL)
		strlcpy(svfsb->f_mntfromname, ps->ps_source, _VFS_NAMELEN);
	else
		strlcpy(svfsb->f_mntfromname, _PATH_FUSE, _VFS_NAMELEN);
out:
	ps->ps_destroy_msg(pm);

	return error;
}

int
perfuse_fs_sync(pu, waitfor, pcr)
	struct puffs_usermount *pu;
	int waitfor;
	const struct puffs_cred *pcr;
{
	/*
	 * FUSE does not seem to have a FS sync callback.
	 * Maybe do not even register this callback
	 */
	return puffs_fsnop_sync(pu, waitfor, pcr);
}

/* ARGSUSED0 */
int
perfuse_fs_fhtonode(pu, fid, fidsize, pni)
	struct puffs_usermount *pu;
	void *fid;
	size_t fidsize;
	struct puffs_newinfo *pni;
{
	DERRX(EX_SOFTWARE, "%s: UNIMPLEMENTED (FATAL)", __func__);
	return 0;
}

/* ARGSUSED0 */
int
perfuse_fs_nodetofh(pu, cookie, fid, fidsize)
	struct puffs_usermount *pu;
	puffs_cookie_t cookie;
	void *fid;
	size_t *fidsize;
{
	DERRX(EX_SOFTWARE, "%s: UNIMPLEMENTED (FATAL)", __func__);
	return 0;
}

#if 0
/* ARGSUSED0 */
void
perfuse_fs_extattrctl(pu, cmd, cookie, flags, namespace, attrname)
	struct puffs_usermount *pu;
	int cmd,
	puffs_cookie_t *cookie;
	int flags;
	int namespace;
	const char *attrname;
{
	DERRX(EX_SOFTWARE, "%s: UNIMPLEMENTED (FATAL)", __func__);
	return 0;
}
#endif /* 0 */

/* ARGSUSED0 */
void
perfuse_fs_suspend(pu, status)
	struct puffs_usermount *pu;
	int status;
{
	return;
}



int
perfuse_node_lookup(pu, opc, pni, pcn)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	struct puffs_newinfo *pni;
	const struct puffs_cn *pcn;
{
	struct puffs_node *pn;
	int error;

	/*
	 * XXX This is borrowed from librefuse,
	 * and __UNCONST is said to be fixed.
	 */
        pn = puffs_pn_nodewalk(pu, puffs_path_walkcmp,
        		       __UNCONST(&pcn->pcn_po_full));

	if (pn == NULL) {
		error = node_lookup_common(pu, opc, (char *)PCNPATH(pcn), &pn);
		if (error != 0)
			return error;
	}

	/*
	 * If that node had a pending reclaim, wipe it out.
	 */
	PERFUSE_NODE_DATA(pn)->pnd_flags &= ~PND_RECLAIMED;

	puffs_newinfo_setcookie(pni, pn);
	puffs_newinfo_setvtype(pni, pn->pn_va.va_type);
	puffs_newinfo_setsize(pni, (voff_t)pn->pn_va.va_size);
	puffs_newinfo_setrdev(pni, pn->pn_va.va_rdev);

	return 0;
}

int
perfuse_node_create(pu, opc, pni, pcn, vap)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	struct puffs_newinfo *pni;
	const struct puffs_cn *pcn;
	const struct vattr *vap;
{
	perfuse_msg_t *pm;
	struct perfuse_state *ps;
	struct fuse_create_in *fci;
	struct fuse_entry_out *feo;
	struct fuse_open_out *foo;
	struct puffs_node *pn;
	const char *name;
	size_t namelen;
	size_t len;
	int error;

	/*
	 * Create an object require -WX permission in the parent directory
	 */
	if (no_access(opc, pcn->pcn_cred, PUFFS_VWRITE|PUFFS_VEXEC))
		return EACCES;

	/*
	 * If create is unimplemented: Check that it does not
	 * already exists, and if not, do mknod and open
	 */
	ps = puffs_getspecific(pu);
	if (ps->ps_flags & PS_NO_CREAT) {
		error = node_lookup_common(pu, opc, (char*)PCNPATH(pcn), &pn);
		if (error == 0)
			return EEXIST;

		error = perfuse_node_mknod(pu, opc, pni, pcn, vap);
		if (error != 0)
			return error;

		error = perfuse_node_open(pu, opc, FREAD|FWRITE, pcn->pcn_cred);
		if (error != 0)
			return error;

		return 0;
	}

	name = basename_r((char *)PCNPATH(pcn));
	namelen = strlen(name) + 1;
	len = sizeof(*fci) + namelen;

	pm = ps->ps_new_msg(pu, opc, FUSE_CREATE, len, pcn->pcn_cred);
	fci = GET_INPAYLOAD(ps, pm, fuse_create_in);
	fci->flags = 0; 	/* No flags seems available */
	fci->mode = vap->va_mode;
	fci->umask = 0; 	/* Seems unused bu libfuse */
	(void)strlcpy((char*)(void *)(fci + 1), name, namelen);

	len = sizeof(*feo) + sizeof(*foo);
	if ((error = XCHG_MSG(ps, pu, pm, len)) != 0)
		goto out;

	feo = GET_OUTPAYLOAD(ps, pm, fuse_entry_out);
	foo = (struct fuse_open_out *)(void *)(feo + 1);
	if (feo->nodeid == PERFUSE_UNKNOWN_INO)
		DERRX(EX_SOFTWARE, "%s: no ino", __func__);

	/*
	 * Save the file handle and inode in node private data
	 * so that we can reuse it later
	 */
	pn = perfuse_new_pn(pu, opc);
	perfuse_new_fh((puffs_cookie_t)pn, foo->fh);
	PERFUSE_NODE_DATA(pn)->pnd_ino = feo->nodeid;

	fuse_attr_to_vap(ps, &pn->pn_va, &feo->attr);
	puffs_newinfo_setcookie(pni, pn);

out:
	ps->ps_destroy_msg(pm);

	/*
	 * create is unimplmented, remember it for later,
	 * and start over using mknod and open instead.
	 */
	if (error == ENOSYS) {
		ps->ps_flags |= PS_NO_CREAT;
		return perfuse_node_create(pu, opc, pni, pcn, vap);
	}

	return error;
}


int
perfuse_node_mknod(pu, opc, pni, pcn, vap)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	struct puffs_newinfo *pni;
	const struct puffs_cn *pcn;
	const struct vattr *vap;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	struct fuse_mknod_in *fmi;
	const char* path;
	size_t len;

	/*
	 * Only superuser can mknod objects other than
	 * directories, files, socks, fifo and links.
	 *
	 * Create an object require -WX permission in the parent directory
	 */
	switch (vap->va_type) {
	case VDIR:	/* FALLTHROUGH */
	case VREG:	/* FALLTHROUGH */
	case VFIFO:	/* FALLTHROUGH */
	case VSOCK:	/* FALLTHROUGH */
	case VLNK:
		if (no_access(opc, pcn->pcn_cred, PUFFS_VWRITE|PUFFS_VEXEC))
			return EACCES;
		break;
	default:	/* VNON, VBLK, VCHR, VBAD */
		if (!puffs_cred_isjuggernaut(pcn->pcn_cred))
			return EACCES;
		break;
	}


	ps = puffs_getspecific(pu);
	path = basename_r((char *)PCNPATH(pcn));
	len = sizeof(*fmi) + strlen(path) + 1;

	pm = ps->ps_new_msg(pu, opc, FUSE_MKNOD, len, pcn->pcn_cred);
	fmi = GET_INPAYLOAD(ps, pm, fuse_mknod_in);
	fmi->mode = vap->va_mode | VTTOIF(vap->va_type);
	fmi->rdev = vap->va_rdev;
	fmi->umask = 0; 	/* Seems unused bu libfuse */
	(void)strlcpy((char *)(void *)(fmi + 1), path, len - sizeof(*fmi));

	return node_mk_common(pu, opc, pni, pcn, vap, pm);
}


int
perfuse_node_open(pu, opc, mode, pcr)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	int mode;
	const struct puffs_cred *pcr;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	mode_t pmode;
	int op;
	struct fuse_open_in *foi;
	struct fuse_open_out *foo;
	struct puffs_node *pn;
	int error;

	ps = puffs_getspecific(pu);

	pn = (struct puffs_node *)opc;
	if (puffs_pn_getvap(pn)->va_type == VDIR) {
		op = FUSE_OPENDIR;
		pmode = PUFFS_VREAD|PUFFS_VEXEC;
	} else {
		op = FUSE_OPEN;
		if (mode & (O_RDWR|O_WRONLY))
			pmode = PUFFS_VWRITE;
		else
			pmode = PUFFS_VREAD;
	}

	/*
	 * Opening a directory require R-X on the directory
	 * Opening a file requires R-- for reading, -W- for writing
	 * In both cases, --X is required on the parent.
	 */
	if (no_access((puffs_cookie_t)PERFUSE_NODE_DATA(opc)->pnd_parent,
	    pcr, PUFFS_VEXEC))
		return EACCES;

	if (no_access(opc, pcr, pmode))
		return EACCES;

	/*
	 * libfuse docs say O_CREAT should not be set.
	 */
	mode &= ~O_CREAT;

	pm = ps->ps_new_msg(pu, opc, op, sizeof(*foi), pcr);
	foi = GET_INPAYLOAD(ps, pm, fuse_open_in);
	foi->flags = mode & ~O_ACCMODE;
	switch (mode & (FREAD|FWRITE)) {
	case FREAD|FWRITE:
		foi->flags |= O_RDWR;
		break;
	case FREAD:
		foi->flags |= O_RDONLY;
		break;
	case FWRITE:
		foi->flags |= O_WRONLY;
		break;
	default:
		break;
	}
	foi->unused = 0;

	if ((error = XCHG_MSG(ps, pu, pm, sizeof(*foo))) != 0)
		goto out;

	foo = GET_OUTPAYLOAD(ps, pm, fuse_open_out);

	/*
	 * Save the file handle in node private data
	 * so that we can reuse it later
	 */
	perfuse_new_fh((puffs_cookie_t)pn, foo->fh);

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_FH)
		DPRINTF("%s: opc = %p, file = \"%s\", "
			"ino = %"PRId64", fh = 0x%"PRIx64"\n",
			__func__, (void *)opc,
			(char *)PNPATH((struct puffs_node *)opc),
			PERFUSE_NODE_DATA(opc)->pnd_ino, foo->fh);
#endif
out:
	ps->ps_destroy_msg(pm);

	return error;
}

/* ARGSUSED2 */
int
perfuse_node_close(pu, opc, flags, pcr)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	int flags;
	const struct puffs_cred *pcr;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	int op;
	uint64_t fh;
	struct perfuse_node_data *pnd;
	struct fuse_release_in *fri;
	struct puffs_node *pn;
	int error;

	ps = puffs_getspecific(pu);
	pn = (struct puffs_node *)opc;
	pnd = PERFUSE_NODE_DATA(pn);

	if (puffs_pn_getvap(pn)->va_type == VDIR)
		op = FUSE_RELEASEDIR;
	else
		op = FUSE_RELEASE;

	if (!(pnd->pnd_flags & PND_OPEN))
		return EBADF;

	fh = perfuse_get_fh(opc);

	/*
	 * Sync before close for files
	 */
	if ((op == FUSE_RELEASE) && (pnd->pnd_flags & PND_DIRTY)) {
#ifdef PERFUSE_DEBUG
		if (perfuse_diagflags & PDF_SYNC)
			DPRINTF("%s: SYNC opc = %p, file = \"%s\"\n",
				__func__, (void*)opc, (char *)PNPATH(pn));
#endif
		if ((error = perfuse_node_fsync(pu, opc, pcr, 0, 0, 0)) != 0)
			return error;

		pnd->pnd_flags &= ~PND_DIRTY;

#ifdef PERFUSE_DEBUG
		if (perfuse_diagflags & PDF_SYNC)
			DPRINTF("%s: CLEAR opc = %p, file = \"%s\"\n",
				__func__, (void*)opc, (char *)PNPATH((pn)));
#endif
	}

	/*
	 * Destroy the filehandle before sending the
	 * request to the FUSE filesystem, otherwise
	 * we may get a second close() while we wait
	 * for the reply, and we would end up closing
	 * the same fh twice instead of closng both.
	 */
	perfuse_destroy_fh(pn, fh);

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_FH)
		DPRINTF("%s: opc = %p, ino = %"PRId64", fh = 0x%"PRIx64"\n",
			__func__, (void *)opc, pnd->pnd_ino, fh);
#endif

	/*
	 * release_flags may be set to FUSE_RELEASE_FLUSH
	 * to flush locks. lock_owner must be set in that case
	 */
	pm = ps->ps_new_msg(pu, opc, op, sizeof(*fri), NULL);
	fri = GET_INPAYLOAD(ps, pm, fuse_release_in);
	fri->fh = fh;
	fri->flags = 0;
	fri->release_flags = 0;
	fri->lock_owner = PERFUSE_NODE_DATA(pn)->pnd_lock_owner;
	fri->flags = (fri->lock_owner != 0) ? FUSE_RELEASE_FLUSH : 0;

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_FH)
		DPRINTF("%s: opc = %p, ino = %"PRId64", fh = 0x%"PRIx64"\n",
			 __func__, (void *)opc, pnd->pnd_ino, fri->fh);
#endif

	if ((error = XCHG_MSG(ps, pu, pm, NO_PAYLOAD_REPLY_LEN)) != 0)
		goto out;

out:
	if (error != 0)
		DWARNX("%s: freed fh = 0x%"PRIx64" but filesystem "
		       "returned error = %d",
		       __func__, fh, error);

	ps->ps_destroy_msg(pm);

	return error;
}

int
perfuse_node_access(pu, opc, mode, pcr)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	int mode;
	const struct puffs_cred *pcr;
{
	perfuse_msg_t *pm;
	struct perfuse_state *ps;
	struct fuse_access_in *fai;
	int error;

	/*
	 * If we previously detected the filesystem does not
	 * implement access(), short-circuit the call and skip
	 * to libpffs access() emulation.
	 */
	ps = puffs_getspecific(pu);
	if (ps->ps_flags & PS_NO_ACCESS) {
		error = ENOSYS;
	} else {
		pm = ps->ps_new_msg(pu, opc, FUSE_ACCESS, sizeof(*fai), pcr);
		fai = GET_INPAYLOAD(ps, pm, fuse_access_in);
		fai->mask = mode;

		error = XCHG_MSG(ps, pu, pm, NO_PAYLOAD_REPLY_LEN);
		ps->ps_destroy_msg(pm);
	}

	if (error == ENOSYS) {
		struct fuse_getattr_in *fgi;
		struct fuse_attr_out *fao;

		ps->ps_flags |= PS_NO_ACCESS;

		pm = ps->ps_new_msg(pu, opc, FUSE_GETATTR,
			      sizeof(*fgi), NULL);
		fgi = GET_INPAYLOAD(ps, pm, fuse_getattr_in);
		fgi->getattr_flags = 0;
		fgi->dummy = 0;
		fgi->fh = perfuse_get_fh(opc);

#ifdef PERFUSE_DEBUG
		if (perfuse_diagflags & PDF_FH)
			DPRINTF("%s: opc = %p, ino = %"PRId64", "
				"fh = 0x%"PRIx64"\n", __func__, (void *)opc,
				PERFUSE_NODE_DATA(opc)->pnd_ino, fgi->fh);
#endif
		if ((error = XCHG_MSG(ps, pu, pm, sizeof(*fao))) != 0) {
			ps->ps_destroy_msg(pm);
			goto out;
		}

		fao = GET_OUTPAYLOAD(ps, pm, fuse_attr_out);

		error = puffs_access(VREG, fao->attr.mode, fao->attr.uid,
				     fao->attr.gid, (mode_t)mode, pcr);

		ps->ps_destroy_msg(pm);
	}

out:
	return error;
}

int
perfuse_node_getattr(pu, opc, vap, pcr)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	struct vattr *vap;
	const struct puffs_cred *pcr;
{
	perfuse_msg_t *pm;
	struct perfuse_state *ps;
	struct fuse_getattr_in *fgi;
	struct fuse_attr_out *fao;
	int error;

	/*
	 * getattr requires --X on the parent directory
	 */
	if (no_access((puffs_cookie_t)PERFUSE_NODE_DATA(opc)->pnd_parent,
	    pcr, PUFFS_VEXEC))
		return EACCES;

	ps = puffs_getspecific(pu);

	/*
	 * FUSE_GETATTR_FH must be set in fgi->flags
	 * if we use for fgi->fh, but we do not.
	 */
	pm = ps->ps_new_msg(pu, opc, FUSE_GETATTR, sizeof(*fgi), pcr);
	fgi = GET_INPAYLOAD(ps, pm, fuse_getattr_in);
	fgi->getattr_flags = 0;
	fgi->dummy = 0;
	fgi->fh = 0;

	if ((error = XCHG_MSG(ps, pu, pm, sizeof(*fao))) != 0)
		goto out;

	fao = GET_OUTPAYLOAD(ps, pm, fuse_attr_out);

	/*
	 * The message from filesystem has a cache timeout
	 * XXX this is ignored yet, is that right?
	 *
	 * We also set birthtime, flags, filerev,vaflags to 0.
	 * This seems the best bet, since the information is
	 * not available from filesystem.
	 */
	fuse_attr_to_vap(ps, vap, &fao->attr);

out:
	ps->ps_destroy_msg(pm);

	return error;
}

int
perfuse_node_setattr(pu, opc, vap, pcr)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	const struct vattr *vap;
	const struct puffs_cred *pcr;
{
	perfuse_msg_t *pm;
	uint64_t fh;
	struct perfuse_state *ps;
	struct fuse_setattr_in *fsi;
	int error;
	struct vattr *old_va;

	/*
	 * setattr requires --X on the parent directory
	 */
	if (no_access((puffs_cookie_t)PERFUSE_NODE_DATA(opc)->pnd_parent,
	    pcr, PUFFS_VEXEC))
		return EACCES;

	old_va = puffs_pn_getvap((struct puffs_node *)opc);

	/*
	 * Check for permission to change size
	 */
	if ((vap->va_size != (u_quad_t)PUFFS_VNOVAL) &&
	    no_access(opc, pcr, PUFFS_VWRITE))
		return EACCES;

	/*
	 * Check for permission to change dates
	 */
	if (((vap->va_atime.tv_sec != (time_t)PUFFS_VNOVAL) ||
	     (vap->va_mtime.tv_sec != (time_t)PUFFS_VNOVAL)) &&
	    (puffs_access_times(old_va->va_uid, old_va->va_gid,
				old_va->va_mode, 0, pcr) != 0))
		return EACCES;

	/*
	 * Check for permission to change owner and group
	 */
	if (((vap->va_uid != (uid_t)PUFFS_VNOVAL) ||
	     (vap->va_gid != (gid_t)PUFFS_VNOVAL)) &&
	    (puffs_access_chown(old_va->va_uid, old_va->va_gid,
				vap->va_uid, vap->va_gid, pcr)) != 0)
		return EACCES;

	/*
	 * Check for permission to change permissions
	 */
	if ((vap->va_mode != (mode_t)PUFFS_VNOVAL) &&
	    (puffs_access_chmod(old_va->va_uid, old_va->va_gid,
				 old_va->va_type, vap->va_mode, pcr)) != 0)
		return EACCES;


	ps = puffs_getspecific(pu);

	pm = ps->ps_new_msg(pu, opc, FUSE_SETATTR, sizeof(*fsi), pcr);
	fsi = GET_INPAYLOAD(ps, pm, fuse_setattr_in);
	fsi->valid = 0;

	if (PERFUSE_NODE_DATA(opc)->pnd_flags & PND_OPEN) {
		fh = perfuse_get_fh(opc);
		fsi->fh = fh;
		if (fh != FUSE_UNKNOWN_FH)
			fsi->valid |= FUSE_FATTR_FH;
	}

	if (vap->va_size != (u_quad_t)PUFFS_VNOVAL) {
		fsi->size = vap->va_size;
		fsi->valid |= FUSE_FATTR_SIZE;
	}

	if (vap->va_atime.tv_sec != (time_t)PUFFS_VNOVAL) {
		fsi->atime = vap->va_atime.tv_sec;;
		fsi->atimensec = (uint32_t)vap->va_atime.tv_nsec;;
		fsi->valid |= (FUSE_FATTR_ATIME|FUSE_FATTR_ATIME_NOW);
	}

	if (vap->va_mtime.tv_sec != (time_t)PUFFS_VNOVAL) {
		fsi->mtime = vap->va_mtime.tv_sec;;
		fsi->mtimensec = (uint32_t)vap->va_mtime.tv_nsec;;
		fsi->valid |= (FUSE_FATTR_MTIME|FUSE_FATTR_MTIME_NOW);
	}

	if (vap->va_mode != (mode_t)PUFFS_VNOVAL) {
		fsi->mode = vap->va_mode;
		fsi->valid |= FUSE_FATTR_MODE;
	}

	if (vap->va_uid != (uid_t)PUFFS_VNOVAL) {
		fsi->uid = vap->va_uid;
		fsi->valid |= FUSE_FATTR_UID;
	}

	if (vap->va_gid != (gid_t)PUFFS_VNOVAL) {
		fsi->gid = vap->va_gid;
		fsi->valid |= FUSE_FATTR_GID;
	}

	if (PERFUSE_NODE_DATA(opc)->pnd_lock_owner != 0) {
		fsi->lock_owner = PERFUSE_NODE_DATA(opc)->pnd_lock_owner;
		fsi->valid |= FUSE_FATTR_LOCKOWNER;
	}

	/*
	 * A fuse_attr_out is returned, but we ignore it.
	 */
	error = XCHG_MSG(ps, pu, pm, sizeof(struct fuse_attr_out));

	ps->ps_destroy_msg(pm);

	return error;
}

int
perfuse_node_poll(pu, opc, events)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	int *events;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	struct fuse_poll_in *fpi;
	struct fuse_poll_out *fpo;
	int error;

	ps = puffs_getspecific(pu);
	/*
	 * kh is set if FUSE_POLL_SCHEDULE_NOTIFY is set.
 	 */
	pm = ps->ps_new_msg(pu, opc, FUSE_POLL, sizeof(*fpi), NULL);
	fpi = GET_INPAYLOAD(ps, pm, fuse_poll_in);
	fpi->fh = perfuse_get_fh(opc);
	fpi->kh = 0;
	fpi->flags = 0;

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_FH)
		DPRINTF("%s: opc = %p, ino = %"PRId64", fh = 0x%"PRIx64"\n",
			__func__, (void *)opc,
			PERFUSE_NODE_DATA(opc)->pnd_ino, fpi->fh);
#endif
	if ((error = XCHG_MSG(ps, pu, pm, sizeof(*fpo))) != 0)
		goto out;

	fpo = GET_OUTPAYLOAD(ps, pm, fuse_poll_out);
	*events = fpo->revents;
out:
	ps->ps_destroy_msg(pm);

	return error;
}

/* ARGSUSED0 */
int
perfuse_node_mmap(pu, opc, flags, pcr)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	int flags;
	const struct puffs_cred *pcr;
{
	/*
	 * Not implemented anymore in libfuse
	 */
	return ENOSYS;
}

/* ARGSUSED2 */
int
perfuse_node_fsync(pu, opc, pcr, flags, offlo, offhi)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	const struct puffs_cred *pcr;
	int flags;
	off_t offlo;
	off_t offhi;
{
	perfuse_msg_t *pm;
	struct perfuse_state *ps;
	struct perfuse_node_data *pnd;
	struct fuse_fsync_in *ffi;
	uint64_t fh;
	int open_self;
	int error;

	pm = NULL;
	open_self = 0;

	/*
	 * If we previously detected it as unimplemented,
	 * skip the call to the filesystem.
	 */
	ps = puffs_getspecific(pu);
	if (ps->ps_flags == PS_NO_FSYNC)
		return ENOSYS;

	/*
	 * Do not sync if there are no change to sync
	 * XXX remove that testif we implement mmap
	 */
	pnd = PERFUSE_NODE_DATA(opc);
#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_SYNC)
		DPRINTF("%s: TEST opc = %p, file = \"%s\" is %sdirty\n",
			__func__, (void*)opc,
			(char *)PNPATH((struct puffs_node *)opc),
			pnd->pnd_flags & PND_DIRTY ? "" : "not ");
#endif
	if (!(pnd->pnd_flags & PND_DIRTY))
		return 0;

	/*
	 * It seems NetBSD can call fsync without open first
	 * glusterfs complain in such a situation:
	 * "FSYNC() ERR => -1 (Invalid argument)"
	 */
	if (!(pnd->pnd_flags & PND_OPEN)) {
		if ((error = perfuse_node_open(pu, opc, FREAD, pcr)) != 0)
			goto out;
		open_self = 1;
	}

	fh = perfuse_get_fh(opc);

	/*
	 * If fsync_flags  is set, meta data should not be flushed.
	 */
	pm = ps->ps_new_msg(pu, opc, FUSE_FSYNC, sizeof(*ffi), NULL);
	ffi = GET_INPAYLOAD(ps, pm, fuse_fsync_in);
	ffi->fh = fh;
	ffi->fsync_flags = (flags & FFILESYNC) ? 0 : 1;

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_FH)
		DPRINTF("%s: opc = %p, ino = %"PRId64", fh = 0x%"PRIx64"\n",
			__func__, (void *)opc,
			PERFUSE_NODE_DATA(opc)->pnd_ino, ffi->fh);
#endif

	if ((error = XCHG_MSG(ps, pu, pm, NO_PAYLOAD_REPLY_LEN)) != 0)
		goto out;

	/*
	 * No reply beyond fuse_out_header: nothing to do on success
	 * just clear the dirty flag
	 */
	pnd->pnd_flags &= ~PND_DIRTY;

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_SYNC)
		DPRINTF("%s: CLEAR opc = %p, file = \"%s\"\n",
			__func__, (void*)opc,
			(char *)PNPATH((struct puffs_node *)opc));
#endif

out:
	if (error == ENOSYS)
		ps->ps_flags |= PS_NO_FSYNC;

	if (pm != NULL)
		ps->ps_destroy_msg(pm);

	if (open_self)
		(void)perfuse_node_close(pu, opc, 0, pcr);

	return error;
}

/* ARGSUSED0 */
int
perfuse_node_seek(pu, opc, oldoff, newoff,  pcr)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	off_t oldoff;
	off_t newoff;
	const struct puffs_cred *pcr;
{
	/*
	 * XXX what should I do with oldoff?
	 * XXX where is the newoffset returned?
	 * XXX the held seek pointer seems just unused
	 */
	PERFUSE_NODE_DATA(opc)->pnd_offset = newoff;

	return 0;
}

int
perfuse_node_remove(pu, opc, targ, pcn)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	puffs_cookie_t targ;
	const struct puffs_cn *pcn;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	struct puffs_node *pn;
	char *path;
	const char *name;
	size_t len;
	int error;

	/*
	 * remove requires -WX on the parent directory
	 * no right required on the object.
	 */
	if (no_access((puffs_cookie_t)PERFUSE_NODE_DATA(opc)->pnd_parent,
	    pcn->pcn_cred, PUFFS_VWRITE|PUFFS_VEXEC))
		return EACCES;

	ps = puffs_getspecific(pu);

	if (targ == NULL)
		DERRX(EX_SOFTWARE, "%s: targ is NULL", __func__);

	pn = (struct puffs_node *)targ;
	name = basename_r((char *)PNPATH(pn));
	len = strlen(name) + 1;

	pm = ps->ps_new_msg(pu, opc, FUSE_UNLINK, len, pcn->pcn_cred);
	path = _GET_INPAYLOAD(ps, pm, char *);
	(void)strlcpy(path, name, len);

	if ((error = XCHG_MSG(ps, pu, pm, UNSPEC_REPLY_LEN)) != 0)
		goto out;

	if (puffs_inval_namecache_dir(pu, opc) != 0)
		DERR(EX_OSERR, "puffs_inval_namecache_dir failed");

	if (puffs_inval_pagecache_node(pu, (puffs_cookie_t)pn) != 0)
		DERR(EX_OSERR, "puffs_inval_namecache_node failed");

	puffs_setback(puffs_cc_getcc(pu), PUFFS_SETBACK_NOREF_N2);

	/*
	 * Reclaim should take care of decreasing pnd_childcount
	 */
out:
	ps->ps_destroy_msg(pm);

	return error;
}

int
perfuse_node_link(pu, opc, targ, pcn)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	puffs_cookie_t targ;
	const struct puffs_cn *pcn;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	const char *name;
	size_t len;
	struct puffs_node *pn;
	struct fuse_link_in *fli;
	int error;

	/*
	 * Create an object require -WX permission in the parent directory
	 */
	if (no_access(opc, pcn->pcn_cred, PUFFS_VWRITE|PUFFS_VEXEC))
		return EACCES;


	ps = puffs_getspecific(pu);
	pn = (struct puffs_node *)targ;
	name = basename_r((char *)PCNPATH(pcn));
	len =  sizeof(*fli) + strlen(name) + 1;

	pm = ps->ps_new_msg(pu, opc, FUSE_LINK, len, pcn->pcn_cred);
	fli = GET_INPAYLOAD(ps, pm, fuse_link_in);
	fli->oldnodeid = PERFUSE_NODE_DATA(pn)->pnd_ino;
	(void)strlcpy((char *)(void *)(fli + 1), name, len - sizeof(*fli));

	error = XCHG_MSG(ps, pu, pm, UNSPEC_REPLY_LEN);

	ps->ps_destroy_msg(pm);

	return error;
}

/* targ is unused since the name is in pcn_targ */
/* ARGSUSED5 */
int
perfuse_node_rename(pu, opc, src, pcn_src, targ_dir, targ, pcn_targ)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	puffs_cookie_t src;
	const struct puffs_cn *pcn_src;
	puffs_cookie_t targ_dir;
	puffs_cookie_t targ;
	const struct puffs_cn *pcn_targ;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	struct fuse_rename_in *fri;
	const char *newname;
	const char *oldname;
	char *np;
	int error;
	size_t len;
	size_t newname_len;
	size_t oldname_len;

	/*
	 * move requires -WX on source and destination directory
	 */
	if (no_access(src, pcn_src->pcn_cred, PUFFS_VWRITE|PUFFS_VEXEC) ||
	    no_access(targ,  pcn_targ->pcn_cred, PUFFS_VWRITE|PUFFS_VEXEC))
		return EACCES;

	ps = puffs_getspecific(pu);
	newname =  basename_r((char *)PCNPATH(pcn_targ));
	newname_len = strlen(newname) + 1;
	oldname =  basename_r((char *)PCNPATH(pcn_src));
	oldname_len = strlen(oldname) + 1;

	len = sizeof(*fri) + oldname_len + newname_len;
	pm = ps->ps_new_msg(pu, opc, FUSE_RENAME, len, pcn_src->pcn_cred);
	fri = GET_INPAYLOAD(ps, pm, fuse_rename_in);
	fri->newdir = PERFUSE_NODE_DATA(targ_dir)->pnd_ino;
	np = (char *)(void *)(fri + 1);
	(void)strlcpy(np, oldname, oldname_len);
	np += oldname_len;
	(void)strlcpy(np, newname, newname_len);

	if ((error = XCHG_MSG(ps, pu, pm, UNSPEC_REPLY_LEN)) != 0)
		goto out;

	/*
	 * Update source and destination directories child count
	 * Update moved object parent directory
	 */
	PERFUSE_NODE_DATA(opc)->pnd_childcount--;
	PERFUSE_NODE_DATA(targ_dir)->pnd_childcount++;
	PERFUSE_NODE_DATA(src)->pnd_parent = targ_dir;

out:
	ps->ps_destroy_msg(pm);

	return error;
}

int
perfuse_node_mkdir(pu, opc, pni, pcn, vap)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	struct puffs_newinfo *pni;
	const struct puffs_cn *pcn;
	const struct vattr *vap;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	struct fuse_mkdir_in *fmi;
	const char *path;
	size_t len;

	/*
	 * Create an object require -WX permission in the parent directory
	 */
	if (no_access(opc, pcn->pcn_cred, PUFFS_VWRITE|PUFFS_VEXEC))
		return EACCES;

	ps = puffs_getspecific(pu);
	path = basename_r((char *)PCNPATH(pcn));
	len = sizeof(*fmi) + strlen(path) + 1;

	pm = ps->ps_new_msg(pu, opc, FUSE_MKDIR, len, pcn->pcn_cred);
	fmi = GET_INPAYLOAD(ps, pm, fuse_mkdir_in);
	fmi->mode = vap->va_mode | VTTOIF(vap->va_type);
	fmi->umask = 0; 	/* Seems unused bu libfuse? */
	(void)strlcpy((char *)(void *)(fmi + 1), path, len - sizeof(*fmi));

	return node_mk_common(pu, opc, pni, pcn, vap, pm);
}


int
perfuse_node_rmdir(pu, opc, targ, pcn)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	puffs_cookie_t targ;
	const struct puffs_cn *pcn;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	struct puffs_node *pn;
	char *path;
	const char *name;
	size_t len;
	int error;

	/*
	 * remove requires -WX on the parent directory
	 * no right required on the object.
	 */
	if (no_access((puffs_cookie_t)PERFUSE_NODE_DATA(opc)->pnd_parent,
	    pcn->pcn_cred, PUFFS_VWRITE|PUFFS_VEXEC))
		return EACCES;

	ps = puffs_getspecific(pu);
	pn = (struct puffs_node *)targ;
	name = basename_r((char *)PNPATH(pn));
	len = strlen(name) + 1;

	pm = ps->ps_new_msg(pu, opc, FUSE_RMDIR, len, pcn->pcn_cred);
	path = _GET_INPAYLOAD(ps, pm, char *);
	(void)strlcpy(path, name, len);

	if ((error = XCHG_MSG(ps, pu, pm, UNSPEC_REPLY_LEN)) != 0)
		goto out;

	if (puffs_inval_namecache_dir(pu, opc) != 0)
		DERR(EX_OSERR, "puffs_inval_namecache_dir failed");

	if (puffs_inval_pagecache_node(pu, (puffs_cookie_t)pn) != 0)
		DERR(EX_OSERR, "puffs_inval_namecache_node failed");

	puffs_setback(puffs_cc_getcc(pu), PUFFS_SETBACK_NOREF_N2);

out:
	ps->ps_destroy_msg(pm);

	return error;
}

/* vap is unused */
/* ARGSUSED4 */
int
perfuse_node_symlink(pu, opc, pni, pcn_src, vap, link_target)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	struct puffs_newinfo *pni;
	const struct puffs_cn *pcn_src;
	const struct vattr *vap;
	const char *link_target;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	char *np;
	const char *path;
	size_t path_len;
	size_t linkname_len;
	size_t len;

	/*
	 * Create an object require -WX permission in the parent directory
	 */
	if (no_access(opc, pcn_src->pcn_cred, PUFFS_VWRITE|PUFFS_VEXEC))
		return EACCES;

	ps = puffs_getspecific(pu);
	path = basename_r((char *)PCNPATH(pcn_src));
	path_len = strlen(path) + 1;
	linkname_len = strlen(link_target) + 1;
	len = path_len + linkname_len;

	pm = ps->ps_new_msg(pu, opc, FUSE_SYMLINK, len, pcn_src->pcn_cred);
	np = _GET_INPAYLOAD(ps, pm, char *);
	(void)strlcpy(np, path, path_len);
	np += path_len;
	(void)strlcpy(np, link_target, linkname_len);

	return node_mk_common(pu, opc, pni, pcn_src, vap, pm);
}

int
perfuse_node_readdir(pu, opc, dent, readoff,
		     reslen, pcr, eofflag, cookies, ncookies)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	struct dirent *dent;
	off_t *readoff;
	size_t *reslen;
	const struct puffs_cred *pcr;
	int *eofflag;
	off_t *cookies;
	size_t *ncookies;
{
	perfuse_msg_t *pm;
	uint64_t fh;
	struct perfuse_state *ps;
	struct perfuse_node_data *pnd;
	struct fuse_read_in *fri;
	struct fuse_out_header *foh;
	struct fuse_dirent *fd;
	size_t foh_len;
	int error;
	int open_self;
	uint64_t fd_offset;

	pm = NULL;
	error = 0;
	open_self = 0;
	ps = puffs_getspecific(pu);

	/*
	 * readdir state is kept at node level, and several readdir
	 * requests can be issued at the same time on the same node.
	 * We need to queue requests so that only one is in readdir
	 * code at the same time.
	 */
	pnd = PERFUSE_NODE_DATA(opc);
	while (pnd->pnd_flags & PND_INREADDIR)
		requeue_request(pu, opc, PCQ_READDIR);
	pnd->pnd_flags |= PND_INREADDIR;

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_READDIR)
		DPRINTF("%s: READDIR opc = %p enter critical section\n",
			__func__, (void *)opc);
#endif
	/*
	 * Do we already have the data bufered?
	 */
	if (pnd->pnd_dirent != NULL)
		goto out;
	pnd->pnd_dirent_len = 0;

	/*
	 * It seems NetBSD can call readdir without open first
	 * libfuse will crash if it is done that way, hence open first.
	 */
	if (!(PERFUSE_NODE_DATA(opc)->pnd_flags & PND_OPEN)) {
		if ((error = perfuse_node_open(pu, opc, FREAD, pcr)) != 0)
			goto out;
		open_self = 1;
	}

	fh = perfuse_get_fh(opc);

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_FH)
		DPRINTF("%s: opc = %p, ino = %"PRId64", fh = 0x%"PRIx64"\n",
			__func__, (void *)opc,
			PERFUSE_NODE_DATA(opc)->pnd_ino, fh);
#endif

	pnd->pnd_all_fd = NULL;
	pnd->pnd_all_fd_len = 0;
	fd_offset = 0;

	do {
		size_t fd_len;
		char *afdp;

		pm = ps->ps_new_msg(pu, opc, FUSE_READDIR, sizeof(*fri), pcr);

		/*
		 * read_flags, lock_owner and flags are unused in libfuse
		 *
		 * XXX if fri->size is too big (bigger than PAGE_SIZE?), 			 * we get strange bugs. ktrace shows 16 bytes or garbage
		 * at the end of sent frames, but perfused does not receive
		 * that data. The data length is hoverver the same, which
		 * cause perfused to use the last 16 bytes of the frame
		 * as the frame header of the next frame.
		 *
		 * This may be a kernel bug.
		 */
		fri = GET_INPAYLOAD(ps, pm, fuse_read_in);
		fri->fh = fh;
		fri->offset = fd_offset;
		fri->size = PAGE_SIZE - sizeof(struct fuse_out_header);
		fri->read_flags = 0;
		fri->lock_owner = 0;
		fri->flags = 0;

		if ((error = XCHG_MSG(ps, pu, pm, UNSPEC_REPLY_LEN)) != 0)
			goto out;

		/*
		 * There are many puffs_framebufs calls later,
		 * therefore foh will not be valid for a long time.
		 * Just get the length and forget it.
		 */
		foh = GET_OUTHDR(ps, pm);
		foh_len = foh->len;

		/*
		 * It seems that the only way to discover the end
		 * of the buffer is to get an empty read
		 */
		if (foh_len == sizeof(*foh))
			break;

		/*
		 * Corrupted message.
		 */
		if (foh_len < sizeof(*foh) + sizeof(*fd)) {
			DWARNX("readdir reply too short");
			error = EIO;
			goto out;
		}


		fd = GET_OUTPAYLOAD(ps, pm, fuse_dirent);
		fd_len = foh_len - sizeof(*foh);

		pnd->pnd_all_fd = realloc(pnd->pnd_all_fd,
					  pnd->pnd_all_fd_len + fd_len);
		if (pnd->pnd_all_fd  == NULL)
			DERR(EX_OSERR, "malloc failed");

		afdp = (char *)(void *)pnd->pnd_all_fd + pnd->pnd_all_fd_len;
		(void)memcpy(afdp, fd, fd_len);

		pnd->pnd_all_fd_len += fd_len;
		fd_offset += fd_len;

		ps->ps_destroy_msg(pm);
		pm = NULL;
	} while (1 /* CONSTCOND */);

	if (fuse_to_dirent(pu, opc, pnd->pnd_all_fd, pnd->pnd_all_fd_len) == -1)
		error = EIO;

out:
	if (pnd->pnd_all_fd != NULL) {
		free(pnd->pnd_all_fd);
		pnd->pnd_all_fd = NULL;
		pnd->pnd_all_fd_len = 0;
	}

	if (pm != NULL)
		ps->ps_destroy_msg(pm);

	/*
	 * If we opened the directory ourselves, close now
	 * errors are ignored.
	 */
	if (open_self)
		(void)perfuse_node_close(pu, opc, 0, pcr);

	if (error == 0)
		error = readdir_buffered(ps, opc, dent, readoff,
			reslen, pcr, eofflag, cookies, ncookies);

	/*
	 * Schedule queued readdir requests
	 */
	dequeue_requests(ps, opc, PCQ_READDIR, DEQUEUE_ALL);
	pnd->pnd_flags &= ~PND_INREADDIR;

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_READDIR)
		DPRINTF("%s: READDIR opc = %p exit critical section\n",
			__func__, (void *)opc);
#endif

	return error;
}

int
perfuse_node_readlink(pu, opc, pcr, linkname, linklen)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	const struct puffs_cred *pcr;
	char *linkname;
	size_t *linklen;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	int error;
	size_t len;
	struct fuse_out_header *foh;

	/*
	 * --X required on parent, R-- required on link
	 */
	if (no_access((puffs_cookie_t)PERFUSE_NODE_DATA(opc)->pnd_parent,
	    pcr, PUFFS_VEXEC) ||
	   no_access(opc, pcr, PUFFS_VREAD))
		return EACCES;

	ps = puffs_getspecific(pu);

	pm = ps->ps_new_msg(pu, opc, FUSE_READLINK, 0, pcr);

	if ((error = XCHG_MSG(ps, pu, pm, UNSPEC_REPLY_LEN)) != 0)
		goto out;

	foh = GET_OUTHDR(ps, pm);
	len = foh->len - sizeof(*foh) + 1;
	if (len > *linklen)
		DERRX(EX_PROTOCOL, "path len = %zd too long", len);

	*linklen = len;
	(void)strlcpy(linkname, _GET_OUTPAYLOAD(ps, pm, char *), len);
out:
	ps->ps_destroy_msg(pm);

	return error;
}

int
perfuse_node_reclaim(pu, opc)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	struct perfuse_node_data *pnd;
	struct fuse_forget_in *ffi;
	struct puffs_node *pn;
	struct puffs_node *pn_root;

	ps = puffs_getspecific(pu);
	pnd = PERFUSE_NODE_DATA(opc);

	/*
	 * Make sure open files are properly closed when reclaimed.
	 */
	while (pnd->pnd_flags & PND_OPEN)
		(void)perfuse_node_close(pu, opc, 0, NULL);

	/*
	 * Never forget the root.
	 */
	if (pnd->pnd_ino == FUSE_ROOT_ID)
		return 0;

	pnd->pnd_flags |= PND_RECLAIMED;

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_RECLAIM)
		DPRINTF("%s (nodeid %"PRId64") reclaimed\n",
		       (char *)PNPATH((struct puffs_node *)opc), pnd->pnd_ino);
#endif

	pn_root = puffs_getroot(pu);
	pn = (struct puffs_node *)opc;
	while (pn != pn_root) {
		struct puffs_node *parent_pn;

		pnd = PERFUSE_NODE_DATA(pn);

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_RECLAIM)
		DPRINTF("%s (nodeid %"PRId64") is %sreclaimed, "
			"has childcount %d, %sopen\n",
		        (char *)PNPATH(pn), pnd->pnd_ino,
		        pnd->pnd_flags & PND_RECLAIMED ? "" : "not ",
		        pnd->pnd_childcount,
			pnd->pnd_flags & PND_OPEN ? "" : "not ");

	if (pnd->pnd_flags & PND_OPEN)
		DWARNX("%s: (nodeid %"PRId64") %s is still open",
		       __func__, pnd->pnd_ino, (char *)PNPATH(pn));
#endif

		if (!(pnd->pnd_flags & PND_RECLAIMED) ||
		    (pnd->pnd_childcount != 0))
			return 0;

		/*
		 * If the file is still open, close all file handles
		 * XXX no pcr arguement to send.
		 */
		while(pnd->pnd_flags & PND_OPEN)
			(void)perfuse_node_close(pu, opc, 0, NULL);

		pm = ps->ps_new_msg(pu, (puffs_cookie_t)pn, FUSE_FORGET,
			      sizeof(*ffi), NULL);
		ffi = GET_INPAYLOAD(ps, pm, fuse_forget_in);
		ffi->nlookup = pnd->pnd_nlookup;

		/*
		 * No reply is expected, pm is freed in XCHG_MSG
		 */
		(void)XCHG_MSG_NOREPLY(ps, pu, pm, UNSPEC_REPLY_LEN);

		parent_pn = pnd->pnd_parent;

		perfuse_destroy_pn(pn);
		puffs_pn_put(pn);

		pn = parent_pn;
	}

	return 0;
}

/* ARGSUSED0 */
int
perfuse_node_inactive(pu, opc)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
{
	return 0;
}


/* ARGSUSED0 */
int
perfuse_node_print(pu, opc)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
{
	DERRX(EX_SOFTWARE, "%s: UNIMPLEMENTED (FATAL)", __func__);
	return 0;
}

/* ARGSUSED0 */
int
perfuse_node_pathconf(pu, opc, name, retval)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	int name;
	int *retval;
{
	DERRX(EX_SOFTWARE, "%s: UNIMPLEMENTED (FATAL)", __func__);
	return 0;
}

/* id is unused */
/* ARGSUSED2 */
int
perfuse_node_advlock(pu, opc, id, op, fl, flags)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	void *id;
	int op;
	struct flock *fl;
	int flags;
{
	struct perfuse_state *ps;
	int fop;
	perfuse_msg_t *pm;
	struct fuse_lk_in *fli;
	struct fuse_lk_out *flo;
	int error;

	ps = puffs_getspecific(pu);

	if (op == F_GETLK)
		fop = FUSE_GETLK;
	else
		fop = (flags & F_WAIT) ? FUSE_SETLKW : FUSE_SETLK;

	pm = ps->ps_new_msg(pu, opc, fop, sizeof(*fli), NULL);
	fli = GET_INPAYLOAD(ps, pm, fuse_lk_in);
	fli->fh = perfuse_get_fh(opc);
	fli->owner = fl->l_pid;
	fli->lk.start = fl->l_start;
	fli->lk.end = fl->l_start + fl->l_len;
	fli->lk.type = fl->l_type;
	fli->lk.pid = fl->l_pid;
	fli->lk_flags = (flags & F_FLOCK) ? FUSE_LK_FLOCK : 0;

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_FH)
		DPRINTF("%s: opc = %p, ino = %"PRId64", fh = 0x%"PRIx64"\n",
			__func__, (void *)opc,
			PERFUSE_NODE_DATA(opc)->pnd_ino, fli->fh);
#endif

	if ((error = XCHG_MSG(ps, pu, pm, sizeof(*flo))) != 0)
		goto out;

	flo = GET_OUTPAYLOAD(ps, pm, fuse_lk_out);
	fl->l_start = flo->lk.start;
	fl->l_len = flo->lk.end - flo->lk.start;
	fl->l_pid = flo->lk.pid;
	fl->l_type = flo->lk.type;
	fl->l_whence = SEEK_SET;	/* libfuse hardcodes it */

	/*
	 * Save or clear the lock
	 */
	switch (op) {
	case F_SETLK:
		PERFUSE_NODE_DATA(opc)->pnd_lock_owner = flo->lk.pid;
		break;
	case F_UNLCK:
		PERFUSE_NODE_DATA(opc)->pnd_lock_owner = 0;
		break;
	default:
		break;
	}

out:
	ps->ps_destroy_msg(pm);

	return error;
}

int
perfuse_node_read(pu, opc, buf, offset, resid, pcr, ioflag)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	uint8_t *buf;
	off_t offset;
	size_t *resid;
	const struct puffs_cred *pcr;
	int ioflag;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	struct fuse_read_in *fri;
	struct fuse_out_header *foh;
	size_t readen;
	size_t requested;
	int error;

	ps = puffs_getspecific(pu);
	pm = NULL;

	requested = *resid;
	if ((ps->ps_readahead + requested) > ps->ps_max_readahead) {
		if (perfuse_diagflags & PDF_REQUEUE)
			DPRINTF("readahead = %zd\n", ps->ps_readahead);
		requeue_request(pu, opc, PCQ_READ);
	}
	ps->ps_readahead += requested;

	do {
		/*
		 * flags may be set to FUSE_READ_LOCKOWNER
		 * if lock_owner is provided.
		 *
		 * XXX See comment about fri->size in perfuse_node_readdir
		 * We encounter the same bug here.
		 */
		pm = ps->ps_new_msg(pu, opc, FUSE_READ, sizeof(*fri), pcr);
		fri = GET_INPAYLOAD(ps, pm, fuse_read_in);
		fri->fh = perfuse_get_fh(opc);
		fri->offset = offset;
		fri->size = (uint32_t)MIN(*resid, PAGE_SIZE - sizeof(*foh));
		fri->read_flags = 0; /* XXX Unused by libfuse? */
		fri->lock_owner = PERFUSE_NODE_DATA(opc)->pnd_lock_owner;
		fri->flags = 0;
		fri->flags |= (fri->lock_owner != 0) ? FUSE_READ_LOCKOWNER : 0;

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_FH)
		DPRINTF("%s: opc = %p, ino = %"PRId64", fh = 0x%"PRIx64"\n",
			__func__, (void *)opc,
			PERFUSE_NODE_DATA(opc)->pnd_ino, fri->fh);
#endif
		error = XCHG_MSG(ps, pu, pm, UNSPEC_REPLY_LEN);

		if (error  != 0)
			goto out;

		foh = GET_OUTHDR(ps, pm);
		readen = foh->len - sizeof(*foh);

		(void)memcpy(buf,  _GET_OUTPAYLOAD(ps, pm, char *), readen);

		buf += readen;
		offset += readen;
		*resid -= readen;

		ps->ps_destroy_msg(pm);
		pm = NULL;
	} while ((*resid != 0) && (readen != 0));

	if (ioflag & (IO_SYNC|IO_DSYNC))
		ps->ps_syncreads++;
	else
		ps->ps_asyncreads++;

out:
	if (pm != NULL)
		ps->ps_destroy_msg(pm);

	ps->ps_readahead -= requested;
	dequeue_requests(ps, opc, PCQ_READ, 1);

	return error;
}

int
perfuse_node_write(pu, opc, buf, offset, resid, pcr, ioflag)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	uint8_t *buf;
	off_t offset;
	size_t *resid;
	const struct puffs_cred *pcr;
	int ioflag;
{
	struct perfuse_state *ps;
	perfuse_msg_t *pm;
	struct fuse_write_in *fwi;
	struct fuse_write_out *fwo;
	size_t data_len;
	size_t payload_len;
	size_t written;
	size_t requested;
	int error;

	ps = puffs_getspecific(pu);
	pm = NULL;
	written = 0;

	requested = *resid;
	if ((ps->ps_write + requested) > ps->ps_max_write) {
		if (perfuse_diagflags & PDF_REQUEUE)
			DPRINTF("write = %zd\n", ps->ps_write);
		requeue_request(pu, opc, PCQ_WRITE);
	}
	ps->ps_write += requested;

	do {
		/*
		 * It seems libfuse does not expects big chunks, so
		 * send it page per page. The writepage feature is
		 * probably there to minmize data movement.
		 * XXX use ps->ps_maxwrite?
		 */
		data_len = MIN(*resid, PAGE_SIZE);
		payload_len = data_len + sizeof(*fwi);

		/*
		 * flags may be set to FUSE_WRITE_CACHE (XXX usage?)
		 * or FUSE_WRITE_LOCKOWNER, if lock_owner is provided.
		 * write_flags is set to 1 for writepage.
		 */
		pm = ps->ps_new_msg(pu, opc, FUSE_WRITE, payload_len, pcr);
		fwi = GET_INPAYLOAD(ps, pm, fuse_write_in);
		fwi->fh = perfuse_get_fh(opc);
		fwi->offset = offset;
		fwi->size = (uint32_t)data_len;
		fwi->write_flags = (fwi->size % PAGE_SIZE) ? 0 : 1;
		fwi->lock_owner = PERFUSE_NODE_DATA(opc)->pnd_lock_owner;
		fwi->flags = 0;
		fwi->flags |= (fwi->lock_owner != 0) ? FUSE_WRITE_LOCKOWNER : 0;
		fwi->flags |= (ioflag & IO_DIRECT) ? 0 : FUSE_WRITE_CACHE;
		(void)memcpy((fwi + 1), buf + written, data_len);

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_FH)
		DPRINTF("%s: opc = %p, ino = %"PRId64", fh = 0x%"PRIx64"\n",
			__func__, (void *)opc,
			PERFUSE_NODE_DATA(opc)->pnd_ino, fwi->fh);
#endif
		if ((error = XCHG_MSG(ps, pu, pm, sizeof(*fwo))) != 0)
			goto out;

		fwo = GET_OUTPAYLOAD(ps, pm, fuse_write_out);
		written = fwo->size;
		*resid -= written;
		offset += written;
		buf += written;

		ps->ps_destroy_msg(pm);
		pm = NULL;
	} while (*resid != 0);

	/*
	 * puffs_ops(3) says
	 *  "everything must be written or an error will be generated"
	 */
	if (*resid != 0)
		error = EFBIG;

	if (ioflag & (IO_SYNC|IO_DSYNC))
		ps->ps_syncwrites++;
	else
		ps->ps_asyncwrites++;

	/*
	 * Remember to sync the file
	 */
	PERFUSE_NODE_DATA(opc)->pnd_flags |= PND_DIRTY;

#ifdef PERFUSE_DEBUG
	if (perfuse_diagflags & PDF_SYNC)
		DPRINTF("%s: DIRTY opc = %p, file = \"%s\"\n",
			__func__, (void*)opc,
			(char *)PNPATH((struct puffs_node *)opc));
#endif
out:
	if (pm != NULL)
		ps->ps_destroy_msg(pm);

	ps->ps_write -= requested;
	dequeue_requests(ps, opc, PCQ_WRITE, 1);

	return error;
}

/* ARGSUSED0 */
void
perfuse_cache_write(pu, opc, size, runs)
	struct puffs_usermount *pu;
	puffs_cookie_t opc;
	size_t size;
	struct puffs_cacherun *runs;
{
	return;
}