/*
   Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 2.1 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/*
 * High level api to nfs filesystems
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef AROS
#include "aros_compat.h"
#endif

#ifdef WIN32
#include "win32_compat.h"
#endif

#ifdef HAVE_UTIME_H
#include <utime.h>
#endif

#ifdef __ANDROID__
#define statvfs statfs
#endif

#define _GNU_SOURCE

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_SYS_VFS_H
#include <sys/vfs.h>
#endif

#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif

#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

#ifdef MAJOR_IN_MKDEV
#include <sys/mkdev.h>
#endif

#ifdef MAJOR_IN_SYSMACROS
#include <sys/sysmacros.h>
#endif

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "libnfs-zdr.h"
#include "slist.h"
#include "libnfs.h"
#include "libnfs-raw.h"
#include "libnfs-raw-mount.h"
#include "libnfs-raw-nfs.h"
#include "libnfs-raw-portmap.h"
#include "libnfs-private.h"

#define MAX_DIR_CACHE 128
#define MAX_LINK_COUNT 40

struct nfsdir {
       struct nfs_fh3 fh;
       fattr3 attr;
       struct nfsdir *next;

       struct nfsdirent *entries;
       struct nfsdirent *current;
};

struct nfs_readahead {
       uint64_t fh_offset;
       uint64_t last_offset;
       uint64_t buf_offset;
       uint64_t buf_count;
       time_t buf_ts;
       char *buf;
       uint32_t cur_ra;
};

struct nfsfh {
       struct nfs_fh3 fh;
       int is_sync;
       int is_append;
       uint64_t offset;
       struct nfs_readahead ra;
};

struct nested_mounts {
       struct nested_mounts *next;
       char *path;
       struct nfs_fh3 fh;
       fattr3 attr;
};

struct nfs_context {
       struct rpc_context *rpc;
       char *server;
       char *export;
       struct nfs_fh3 rootfh;
       uint64_t readmax;
       uint64_t writemax;
       char *cwd;
       struct nfsdir *dircache;
       uint16_t	mask;

       int auto_traverse_mounts;
       struct nested_mounts *nested_mounts;
};

void nfs_free_nfsdir(struct nfsdir *nfsdir)
{
	while (nfsdir->entries) {
		struct nfsdirent *dirent = nfsdir->entries->next;
		if (nfsdir->entries->name != NULL) {
			free(nfsdir->entries->name);
		}
		free(nfsdir->entries);
		nfsdir->entries = dirent;
	}
	free(nfsdir->fh.data.data_val);
	free(nfsdir);
}

static void nfs_dircache_add(struct nfs_context *nfs, struct nfsdir *nfsdir)
{
	int i;
	LIBNFS_LIST_ADD(&nfs->dircache, nfsdir);

	for (nfsdir = nfs->dircache, i = 0; nfsdir; nfsdir = nfsdir->next, i++) {
		if (i > MAX_DIR_CACHE) {
			LIBNFS_LIST_REMOVE(&nfs->dircache, nfsdir);
			nfs_free_nfsdir(nfsdir);
			break;
		}
	}
}

static struct nfsdir *nfs_dircache_find(struct nfs_context *nfs, struct nfs_fh3 *fh)
{
	struct nfsdir *nfsdir;

	for (nfsdir = nfs->dircache; nfsdir; nfsdir = nfsdir->next) {
		if (nfsdir->fh.data.data_len == fh->data.data_len &&
		    !memcmp(nfsdir->fh.data.data_val, fh->data.data_val, fh->data.data_len)) {
			LIBNFS_LIST_REMOVE(&nfs->dircache, nfsdir);
			return nfsdir;
		}
	}

	return NULL;
}

struct nfs_cb_data;
typedef int (*continue_func)(struct nfs_context *nfs, fattr3 *attr,
			     struct nfs_cb_data *data);

struct nfs_cb_data {
       struct nfs_context *nfs;
       struct nfsfh *nfsfh;
       char *saved_path, *path;
       int link_count, no_follow;

       nfs_cb cb;
       void *private_data;

       continue_func continue_cb;
       void *continue_data;
       void (*free_continue_data)(void *);
       uint64_t continue_int;

       struct nfs_fh3 fh;

       /* for multi-read/write calls. */
       int error;
       int cancel;
       int oom;
       int num_calls;
       uint64_t offset, count, max_offset, org_offset, org_count;
       char *buffer;
       char *usrbuf;
};

struct nfs_mcb_data {
       struct nfs_cb_data *data;
       uint64_t offset;
       uint64_t count;
       int update_pos;
};

static int nfs_lookup_path_async_internal(struct nfs_context *nfs, fattr3 *attr, struct nfs_cb_data *data, struct nfs_fh3 *fh);
static int nfs_normalize_path(struct nfs_context *nfs, char *path);

void nfs_set_auth(struct nfs_context *nfs, struct AUTH *auth)
{
	rpc_set_auth(nfs->rpc, auth);
}

int nfs_get_fd(struct nfs_context *nfs)
{
	return rpc_get_fd(nfs->rpc);
}

int nfs_queue_length(struct nfs_context *nfs)
{
	return rpc_queue_length(nfs->rpc);
}

int nfs_which_events(struct nfs_context *nfs)
{
	return rpc_which_events(nfs->rpc);
}

int nfs_service(struct nfs_context *nfs, int revents)
{
	return rpc_service(nfs->rpc, revents);
}

char *nfs_get_error(struct nfs_context *nfs)
{
	return rpc_get_error(nfs->rpc);
};

static int nfs_set_context_args(struct nfs_context *nfs, const char *arg, const char *val)
{
	if (!strcmp(arg, "tcp-syncnt")) {
		rpc_set_tcp_syncnt(nfs_get_rpc_context(nfs), atoi(val));
	} else if (!strcmp(arg, "uid")) {
		rpc_set_uid(nfs_get_rpc_context(nfs), atoi(val));
	} else if (!strcmp(arg, "gid")) {
		rpc_set_gid(nfs_get_rpc_context(nfs), atoi(val));
	} else if (!strcmp(arg, "readahead")) {
		rpc_set_readahead(nfs_get_rpc_context(nfs), atoi(val));
	} else if (!strcmp(arg, "debug")) {
		rpc_set_debug(nfs_get_rpc_context(nfs), atoi(val));
	} else if (!strcmp(arg, "auto-traverse-mounts")) {
		nfs->auto_traverse_mounts = atoi(val);
	}
	return 0;
}

static struct nfs_url *nfs_parse_url(struct nfs_context *nfs, const char *url, int dir, int incomplete)
{
	struct nfs_url *urls;
	char *strp, *flagsp, *strp2;

	if (strncmp(url, "nfs://", 6)) {
		rpc_set_error(nfs->rpc, "Invalid URL specified");
		return NULL;
	}

	urls = malloc(sizeof(struct nfs_url));
	if (urls == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory");
		return NULL;
	}

	memset(urls, 0x00, sizeof(struct nfs_url));
	urls->server = strdup(url + 6);
	if (urls->server == NULL) {
		nfs_destroy_url(urls);
		rpc_set_error(nfs->rpc, "Out of memory");
		return NULL;
	}

	if (urls->server[0] == '/' || urls->server[0] == '\0' ||
		urls->server[0] == '?') {
		if (incomplete) {
			flagsp = strchr(urls->server, '?');
			goto flags;
		}
		nfs_destroy_url(urls);
		rpc_set_error(nfs->rpc, "Invalid server string");
		return NULL;
	}

	strp = strchr(urls->server, '/');
	if (strp == NULL) {
		if (incomplete) {
			flagsp = strchr(urls->server, '?');
			goto flags;
		}
		nfs_destroy_url(urls);
		rpc_set_error(nfs->rpc, "Incomplete or invalid URL specified.");
		return NULL;
	}

	urls->path = strdup(strp);
	if (urls->path == NULL) {
		nfs_destroy_url(urls);
		rpc_set_error(nfs->rpc, "Out of memory");
		return NULL;
	}
	*strp = 0;

	if (dir) {
		flagsp = strchr(urls->path, '?');
		goto flags;
	}

	strp = strrchr(urls->path, '/');
	if (strp == NULL) {
		if (incomplete) {
			flagsp = strchr(urls->path, '?');
			goto flags;
		}
		nfs_destroy_url(urls);
		rpc_set_error(nfs->rpc, "Incomplete or invalid URL specified.");
		return NULL;
	}
	urls->file = strdup(strp);
	if (urls->path == NULL) {
		nfs_destroy_url(urls);
		rpc_set_error(nfs->rpc, "Out of memory");
		return NULL;
	}
	*strp = 0;
	flagsp = strchr(urls->file, '?');

flags:
	if (flagsp) {
		*flagsp = 0;
	}

	if (urls->file && !strlen(urls->file)) {
		free(urls->file);
		urls->file = NULL;
		if (!incomplete) {
			nfs_destroy_url(urls);
			rpc_set_error(nfs->rpc, "Incomplete or invalid URL specified.");
			return NULL;
		}
	}

	while (flagsp != NULL && *(flagsp+1) != 0) {
		strp = flagsp + 1;
		flagsp = strchr(strp, '&');
		if (flagsp) {
			*flagsp = 0;
		}
		strp2 = strchr(strp, '=');
		if (strp2) {
			*strp2 = 0;
			strp2++;
			nfs_set_context_args(nfs, strp, strp2);
		}
	}

	if (urls->server && strlen(urls->server) <= 1) {
		free(urls->server);
		urls->server = NULL;
	}

	return urls;
}

struct nfs_url *nfs_parse_url_full(struct nfs_context *nfs, const char *url)
{
	return nfs_parse_url(nfs, url, 0, 0);
}

struct nfs_url *nfs_parse_url_dir(struct nfs_context *nfs, const char *url)
{
	return nfs_parse_url(nfs, url, 1, 0);
}

struct nfs_url *nfs_parse_url_incomplete(struct nfs_context *nfs, const char *url)
{
	return nfs_parse_url(nfs, url, 0, 1);
}


void nfs_destroy_url(struct nfs_url *url)
{
	if (url) {
		free(url->server);
		free(url->path);
		free(url->file);
	}
	free(url);
}

struct nfs_context *nfs_init_context(void)
{
	struct nfs_context *nfs;

	nfs = malloc(sizeof(struct nfs_context));
	if (nfs == NULL) {
		return NULL;
	}
	memset(nfs, 0, sizeof(struct nfs_context));

	nfs->rpc = rpc_init_context();
	if (nfs->rpc == NULL) {
		free(nfs);
		return NULL;
	}

	nfs->cwd = strdup("/");
	nfs->mask = 022;
	nfs->auto_traverse_mounts = 1;
	return nfs;
}

void nfs_destroy_context(struct nfs_context *nfs)
{
	while (nfs->nested_mounts) {
		struct nested_mounts *mnt = nfs->nested_mounts;

		LIBNFS_LIST_REMOVE(&nfs->nested_mounts, mnt);
		free(mnt->path);
		free(mnt->fh.data.data_val);
	}

	rpc_destroy_context(nfs->rpc);
	nfs->rpc = NULL;

	if (nfs->server) {
		free(nfs->server);
		nfs->server = NULL;
	}

	if (nfs->export) {
		free(nfs->export);
		nfs->export = NULL;
	}

	if (nfs->cwd) {
		free(nfs->cwd);
		nfs->cwd = NULL;
	}

	if (nfs->rootfh.data.data_val != NULL) {
		free(nfs->rootfh.data.data_val);
		nfs->rootfh.data.data_val = NULL;
	}

	while (nfs->dircache) {
		struct nfsdir *nfsdir = nfs->dircache;
		LIBNFS_LIST_REMOVE(&nfs->dircache, nfsdir);
		nfs_free_nfsdir(nfsdir);
	}

	free(nfs);
}

struct rpc_cb_data {
       char *server;
       uint32_t program;
       uint32_t version;

       rpc_cb cb;
       void *private_data;
};

void free_rpc_cb_data(struct rpc_cb_data *data)
{
	free(data->server);
	data->server = NULL;
	free(data);
}

static void rpc_connect_program_5_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct rpc_cb_data *data = private_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	/* Dont want any more callbacks even if the socket is closed */
	rpc->connect_cb = NULL;

	if (status == RPC_STATUS_ERROR) {
		data->cb(rpc, status, command_data, data->private_data);
		free_rpc_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(rpc, status, "Command was cancelled", data->private_data);
		free_rpc_cb_data(data);
		return;
	}

	data->cb(rpc, status, NULL, data->private_data);
	free_rpc_cb_data(data);
}

static void rpc_connect_program_4_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct rpc_cb_data *data = private_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	/* Dont want any more callbacks even if the socket is closed */
	rpc->connect_cb = NULL;

	if (status == RPC_STATUS_ERROR) {
		data->cb(rpc, status, command_data, data->private_data);
		free_rpc_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(rpc, status, "Command was cancelled", data->private_data);
		free_rpc_cb_data(data);
		return;
	}

	switch (data->program) {
	case MOUNT_PROGRAM:
		if (rpc_mount3_null_async(rpc, rpc_connect_program_5_cb,
					data) != 0) {
			data->cb(rpc, status, command_data, data->private_data);
			free_rpc_cb_data(data);
			return;
		}
		return;
	case NFS_PROGRAM:
		if (rpc_nfs3_null_async(rpc, rpc_connect_program_5_cb,
					data) != 0) {
			data->cb(rpc, status, command_data, data->private_data);
			free_rpc_cb_data(data);
			return;
		}
		return;
	}

	data->cb(rpc, status, NULL, data->private_data);
	free_rpc_cb_data(data);
}

static void rpc_connect_program_3_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct rpc_cb_data *data = private_data;
	struct pmap3_string_result *gar;
	uint32_t rpc_port = 0;
	char *ptr;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(rpc, status, command_data, data->private_data);
		free_rpc_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(rpc, status, "Command was cancelled", data->private_data);
		free_rpc_cb_data(data);
		return;
	}

	switch (rpc->s.ss_family) {
	case AF_INET:
		rpc_port = *(uint32_t *)command_data;
		break;
	case AF_INET6:
		/* ouch. portmapper and ipv6 are not great */
		gar = command_data;
		if (gar->addr == NULL) {
			break;
		}
		ptr = strrchr(gar->addr, '.');
		if (ptr == NULL) {
			break;
		}
		rpc_port = atoi(ptr + 1);
		*ptr = 0;
		ptr = strrchr(gar->addr, '.');
		if (ptr == NULL) {
			break;
		}
		rpc_port += 256 * atoi(ptr + 1);
		break;
	}
	if (rpc_port == 0) {
		rpc_set_error(rpc, "RPC error. Program is not available on %s", data->server);
		data->cb(rpc, RPC_STATUS_ERROR, rpc_get_error(rpc), data->private_data);
		free_rpc_cb_data(data);
		return;
	}

	rpc_disconnect(rpc, "normal disconnect");
	if (rpc_connect_async(rpc, data->server, rpc_port, rpc_connect_program_4_cb, data) != 0) {
		data->cb(rpc, status, command_data, data->private_data);
		free_rpc_cb_data(data);
		return;
	}
}

static void rpc_connect_program_2_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct rpc_cb_data *data = private_data;
	struct pmap3_mapping map;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(rpc, status, command_data, data->private_data);
		free_rpc_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(rpc, status, "Command was cancelled", data->private_data);
		free_rpc_cb_data(data);
		return;
	}

	switch (rpc->s.ss_family) {
	case AF_INET:
		if (rpc_pmap2_getport_async(rpc, data->program, data->version, IPPROTO_TCP, rpc_connect_program_3_cb, private_data) != 0) {
			data->cb(rpc, status, command_data, data->private_data);
			free_rpc_cb_data(data);
			return;
		}
		break;
	case AF_INET6:
		map.prog=data->program;
		map.vers=data->version;
		map.netid="";
		map.addr="";
		map.owner="";
		if (rpc_pmap3_getaddr_async(rpc, &map, rpc_connect_program_3_cb, private_data) != 0) {
			data->cb(rpc, status, command_data, data->private_data);
			free_rpc_cb_data(data);
			return;
		}
		break;
	}
}

static void rpc_connect_program_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct rpc_cb_data *data = private_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	/* Dont want any more callbacks even if the socket is closed */
	rpc->connect_cb = NULL;

	if (status == RPC_STATUS_ERROR) {
		data->cb(rpc, status, command_data, data->private_data);
		free_rpc_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(rpc, status, "Command was cancelled", data->private_data);
		free_rpc_cb_data(data);
		return;
	}

	switch (rpc->s.ss_family) {
	case AF_INET:
		if (rpc_pmap2_null_async(rpc, rpc_connect_program_2_cb, data) != 0) {
			data->cb(rpc, status, command_data, data->private_data);
			free_rpc_cb_data(data);
			return;
		}
		break;
	case AF_INET6:
		if (rpc_pmap3_null_async(rpc, rpc_connect_program_2_cb, data) != 0) {
			data->cb(rpc, status, command_data, data->private_data);
			free_rpc_cb_data(data);
			return;
		}
		break;
	}
}

int rpc_connect_program_async(struct rpc_context *rpc, const char *server, int program, int version, rpc_cb cb, void *private_data)
{
	struct rpc_cb_data *data;

	data = malloc(sizeof(struct rpc_cb_data));
	if (data == NULL) {
		return -1;
	}
	memset(data, 0, sizeof(struct rpc_cb_data));
	data->server       = strdup(server);
	data->program      = program;
	data->version      = version;

	data->cb           = cb;
	data->private_data = private_data;

	if (rpc_connect_async(rpc, server, 111, rpc_connect_program_1_cb, data) != 0) {
		rpc_set_error(rpc, "Failed to start connection");
		free_rpc_cb_data(data);
		return -1;
	}
	return 0;
}

static void free_nfs_cb_data(struct nfs_cb_data *data)
{
	if (data->continue_data != NULL) {
		assert(data->free_continue_data);
		data->free_continue_data(data->continue_data);
	}

	free(data->saved_path);
	free(data->fh.data.data_val);
	free(data->buffer);

	free(data);
}

static void free_nfsfh(struct nfsfh *nfsfh)
{
	if (nfsfh->fh.data.data_val != NULL) {
		free(nfsfh->fh.data.data_val);
		nfsfh->fh.data.data_val = NULL;
	}
	free(nfsfh->ra.buf);
	free(nfsfh);
}


struct mount_attr_cb {
	int wait_count;
	struct nfs_cb_data *data;
};

struct mount_attr_item_cb {
	struct mount_attr_cb *ma;
	struct nested_mounts *mnt;
};

static void nfs_mount_12_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct mount_attr_item_cb *ma_item = private_data;
	struct mount_attr_cb *ma = ma_item->ma;
	struct nfs_cb_data *data = ma->data;
	struct nfs_context *nfs = data->nfs;
	GETATTR3res *res;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR)
		goto finished;
	if (status == RPC_STATUS_CANCEL)
		goto finished;

	res = command_data;
	if (res->status != NFS3_OK)
		goto finished;

	ma_item->mnt->attr = res->GETATTR3res_u.resok.obj_attributes;

finished:
	free(ma_item);
	ma->wait_count--;
	if (ma->wait_count > 0)
		return;

	free(ma);
	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static void nfs_mount_11_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct mount_attr_cb *ma = NULL;
	struct nested_mounts *mnt;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	if (!nfs->nested_mounts)
		goto finished;

	/* nested mount traversals are best-effort only, so any
	 * failures just means that we don't get traversal for that
	 * particular mount. We do not fail the call from the application.
	 */
	ma = malloc(sizeof(struct mount_attr_cb));
	if (ma == NULL)
		goto finished;
	memset(ma, 0, sizeof(struct mount_attr_cb));
	ma->data = data;

	for(mnt = nfs->nested_mounts; mnt; mnt = mnt->next) {
		struct mount_attr_item_cb *ma_item;
		struct GETATTR3args args;

		ma_item = malloc(sizeof(struct mount_attr_item_cb));
		if (ma_item == NULL)
			goto finished;
		ma_item->mnt = mnt;
		ma_item->ma = ma;

		memset(&args, 0, sizeof(GETATTR3args));
		args.object = mnt->fh;

		if (rpc_nfs3_getattr_async(rpc, nfs_mount_12_cb, &args,
					   ma_item) != 0) {
			free(ma_item);
			continue;
		}

		ma->wait_count++;
	}

finished:
	if (ma && ma->wait_count)
		return;

	free(ma);
	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static void nfs_mount_10_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	FSINFO3res *res = command_data;
	struct GETATTR3args args;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	nfs->readmax = res->FSINFO3res_u.resok.rtmax;
	nfs->writemax = res->FSINFO3res_u.resok.wtmax;

	if (nfs->readmax > NFS_MAX_XFER_SIZE) {
		rpc_set_error(rpc, "server max rsize of %lu is greater than libnfs supported %d bytes",
		              nfs->readmax, NFS_MAX_XFER_SIZE);
		data->cb(-EINVAL, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	if (nfs->writemax > NFS_MAX_XFER_SIZE) {
		rpc_set_error(rpc, "server max wsize of %lu is greater than libnfs supported %d bytes",
		              nfs->writemax, NFS_MAX_XFER_SIZE);
		data->cb(-EINVAL, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	memset(&args, 0, sizeof(GETATTR3args));
	args.object = nfs->rootfh;

	if (rpc_nfs3_getattr_async(rpc, nfs_mount_11_cb, &args, data) != 0) {
		data->cb(-ENOMEM, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
}

static void nfs_mount_9_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct FSINFO3args args;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	/* NFS TCP connections we want to autoreconnect after sessions are torn down (due to inactivity or error) */
	rpc_set_autoreconnect(rpc);

	args.fsroot = nfs->rootfh;
	if (rpc_nfs3_fsinfo_async(rpc, nfs_mount_10_cb, &args, data) != 0) {
		data->cb(-ENOMEM, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
}

struct mount_discovery_cb {
	int wait_count;
	struct nfs_cb_data *data;
};

struct mount_discovery_item_cb {
	struct mount_discovery_cb *md_cb;
	char *path;
};

static void nfs_mount_8_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct mount_discovery_item_cb *md_item_cb = private_data;
	struct mount_discovery_cb *md_cb = md_item_cb->md_cb;
	struct nfs_cb_data *data = md_cb->data;
	struct nfs_context *nfs = data->nfs;
	mountres3 *res;
	struct nested_mounts *mnt;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR)
		goto finished;
	if (status == RPC_STATUS_CANCEL)
		goto finished;

	res = command_data;
	if (res->fhs_status != MNT3_OK)
		goto finished;

	mnt = malloc(sizeof(*mnt));
	if (mnt == NULL)
		goto finished;
	memset(mnt, 0, sizeof(*mnt));

	mnt->fh.data.data_len = res->mountres3_u.mountinfo.fhandle.fhandle3_len;
	mnt->fh.data.data_val = malloc(mnt->fh.data.data_len);
	if (mnt->fh.data.data_val == NULL) {
		free(mnt);
		goto finished;
	}
	memcpy(mnt->fh.data.data_val,
	       res->mountres3_u.mountinfo.fhandle.fhandle3_val,
	       mnt->fh.data.data_len);

	mnt->path = md_item_cb->path;
	md_item_cb->path = NULL;

	LIBNFS_LIST_ADD(&nfs->nested_mounts, mnt);

finished:
	free(md_item_cb->path);
	free(md_item_cb);
	md_cb->wait_count--;
	if (md_cb->wait_count > 0)
		return;
	free(md_cb);

	rpc_disconnect(rpc, "normal disconnect");

	if (rpc_connect_program_async(nfs->rpc, nfs->server, NFS_PROGRAM, NFS_V3, nfs_mount_9_cb, data) != 0) {
		data->cb(-ENOMEM, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
}

static void nfs_mount_7_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	exports res;
	int len;
	struct mount_discovery_cb *md_cb = NULL;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	/* iterate over all exporst and check if we any exports nested
	 * below out mount.
	 */
	len = strlen(nfs->export);
	if (!len) {
		data->cb(-EFAULT, nfs, "Export is empty", data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	res = *(exports *)command_data;
	while (res) {
		struct mount_discovery_item_cb *md_item_cb;

		if (strncmp(nfs->export, res->ex_dir, len)) {
			res = res->ex_next;
			continue;
		}
		if (res->ex_dir[len - 1] != '/' && res->ex_dir[len] != '/') {
			res = res->ex_next;
			continue;
		}

		/* There is no need to fail the whole mount if anything
		 * below fails. Just clean up and continue. At worst it
		 * just mean that we might not be able to access any nested
		 * mounts.
		 */
		md_item_cb = malloc(sizeof(*md_item_cb));
		if (md_item_cb == NULL)
			continue;

		memset(md_item_cb, 0, sizeof(*md_item_cb));

		md_item_cb->path = strdup(res->ex_dir + len
					  - (nfs->export[len -1] == '/'));
		if (md_item_cb->path == NULL) {
			free(md_item_cb);
			continue;
		}

		if (md_cb == NULL) {
			md_cb = malloc(sizeof(*md_cb));
			if (md_cb == NULL) {
				free(md_item_cb->path);
				free(md_item_cb);
				continue;
			}
			memset(md_cb, 0, sizeof(*md_cb));
			md_cb->data = data;
		}
		md_item_cb->md_cb = md_cb;

		if (rpc_mount3_mnt_async(rpc, nfs_mount_8_cb,
					 res->ex_dir, md_item_cb) != 0) {
			if (md_cb->wait_count == 0) {
				free(md_cb);
				md_cb = NULL;
			}
			free(md_item_cb->path);
			free(md_item_cb);
			continue;
		}
		md_cb->wait_count++;

		res = res->ex_next;
	}

	if (md_cb)
		return;

	/* We did not have any nested mounts to check so we can proceed straight
	 * to reconnecting to NFSd.
	 */
	rpc_disconnect(rpc, "normal disconnect");

	if (rpc_connect_program_async(nfs->rpc, nfs->server, NFS_PROGRAM, NFS_V3, nfs_mount_9_cb, data) != 0) {
		data->cb(-ENOMEM, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
}

static void nfs_mount_6_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	mountres3 *res;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->fhs_status != MNT3_OK) {
		rpc_set_error(rpc, "RPC error: Mount failed with error %s(%d) %s(%d)", mountstat3_to_str(res->fhs_status), res->fhs_status, strerror(-mountstat3_to_errno(res->fhs_status)), -mountstat3_to_errno(res->fhs_status));
		data->cb(mountstat3_to_errno(res->fhs_status), nfs, rpc_get_error(rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	nfs->rootfh.data.data_len = res->mountres3_u.mountinfo.fhandle.fhandle3_len;
	nfs->rootfh.data.data_val = malloc(nfs->rootfh.data.data_len);
	if (nfs->rootfh.data.data_val == NULL) {
		rpc_set_error(rpc, "Out of memory. Could not allocate memory to store root filehandle");
		data->cb(-ENOMEM, nfs, rpc_get_error(rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	memcpy(nfs->rootfh.data.data_val, res->mountres3_u.mountinfo.fhandle.fhandle3_val, nfs->rootfh.data.data_len);

	if (nfs->auto_traverse_mounts) {
		if (rpc_mount3_export_async(rpc, nfs_mount_7_cb, data) != 0) {
			data->cb(-ENOMEM, nfs, command_data, data->private_data);
			free_nfs_cb_data(data);
			return;
		}
		return;
	}

	rpc_disconnect(rpc, "normal disconnect");

	if (rpc_connect_program_async(nfs->rpc, nfs->server, NFS_PROGRAM, NFS_V3, nfs_mount_9_cb, data) != 0) {
		data->cb(-ENOMEM, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
}


static void nfs_mount_5_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	if (rpc_mount3_mnt_async(rpc, nfs_mount_6_cb, nfs->export, data) != 0) {
		data->cb(-ENOMEM, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
}

/*
 * Async call for mounting an nfs share and geting the root filehandle
 */
int nfs_mount_async(struct nfs_context *nfs, const char *server, const char *export, nfs_cb cb, void *private_data)
{
	struct nfs_cb_data *data;
	char *new_server, *new_export;

	data = malloc(sizeof(struct nfs_cb_data));
	if (data == NULL) {
		rpc_set_error(nfs->rpc, "out of memory. failed to allocate memory for nfs mount data");
		return -1;
	}
	memset(data, 0, sizeof(struct nfs_cb_data));
	new_server = strdup(server);
	new_export = strdup(export);
	if (nfs->server != NULL) {
		free(nfs->server);
	}
	nfs->server        = new_server;
	if (nfs->export != NULL) {
		free(nfs->export);
	}
	nfs->export        = new_export;
	data->nfs          = nfs;
	data->cb           = cb;
	data->private_data = private_data;

	if (rpc_connect_program_async(nfs->rpc, server, MOUNT_PROGRAM, MOUNT_V3, nfs_mount_5_cb, data) != 0) {
		rpc_set_error(nfs->rpc, "Failed to start connection");
		free_nfs_cb_data(data);
		return -1;
	}

	return 0;
}



/*
 * Functions to first look up a path, component by component, and then finally call a specific function once
 * the filehandle for the final component is found.
 */
static void nfs_lookup_path_2_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	READLINK3res *res;
	char *path, *newpath;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: READLINK of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	path = res->READLINK3res_u.resok.data;

	/* Handle absolute paths, ensuring that the path lies within the
	 * export. */
	if (path[0] == '/') {
		if (strstr(path, nfs->export) == path) {
			char *ptr = path + strlen(nfs->export);
			if (*ptr == '/') {
				newpath = strdup(ptr);
			} else if (*ptr == '\0') {
				newpath = strdup("/");
			} else {
				data->cb(-ENOENT, nfs, "Symbolic link points outside export", data->private_data);
				free_nfs_cb_data(data);
				return;
			}
		} else {
			data->cb(-ENOENT, nfs, "Symbolic link points outside export", data->private_data);
			free_nfs_cb_data(data);
			return;
		}

		if (!newpath)
			goto nomem;
	} else {
		/* Handle relative paths, both the case where the current
		 * component is an intermediate component and when it is the
		 * final component. */
		if (data->path[0]) {
			/* Since path points to a component and saved_path
			 * always starts with '/', path[-1] is valid. */
			data->path[-1] = '\0';
			newpath = malloc(strlen(data->saved_path) + strlen(path) + strlen(data->path) + 6);
			if (!newpath)
				goto nomem;

			sprintf(newpath, "%s/../%s/%s", data->saved_path, path, data->path);
		} else {
			newpath = malloc(strlen(data->saved_path) + strlen(path) + 5);
			if (!newpath)
				goto nomem;

			sprintf(newpath, "%s/../%s", data->saved_path, path);
		}
	}
	free(data->saved_path);
	data->saved_path = newpath;

	if (nfs_normalize_path(nfs, data->saved_path) != 0) {
		data->cb(-ENOENT, nfs, "Symbolic link resolves to invalid path", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->path = data->saved_path;
	nfs_lookup_path_async_internal(nfs, NULL, data, &nfs->rootfh);
	return;

nomem:
	data->cb(-ENOMEM, nfs, "Failed to allocate memory for path", data->private_data);
	free_nfs_cb_data(data);
}

static void nfs_lookup_path_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	LOOKUP3res *res;
	fattr3 *attr;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: Lookup of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	attr = res->LOOKUP3res_u.resok.obj_attributes.attributes_follow ?
	  &res->LOOKUP3res_u.resok.obj_attributes.post_op_attr_u.attributes :
	  NULL;

	/* This function will always invoke the callback and cleanup
	 * for failures. So no need to check the return value.
	 */
	nfs_lookup_path_async_internal(nfs, attr, data, &res->LOOKUP3res_u.resok.object);
}

static int nfs_lookup_path_async_internal(struct nfs_context *nfs, fattr3 *attr, struct nfs_cb_data *data, struct nfs_fh3 *fh)
{
	char *path, *slash;
	LOOKUP3args args;

	while (*data->path == '/') {
	      data->path++;
	}

	path = data->path;
	slash = strchr(path, '/');

	if (attr && attr->type == NF3LNK && (!data->no_follow || *path != '\0')) {
		READLINK3args rl_args;

		if (data->link_count++ >= MAX_LINK_COUNT) {
			data->cb(-ELOOP, nfs, "Too many levels of symbolic links", data->private_data);
			free_nfs_cb_data(data);
			return -1;
		}

		rl_args.symlink = *fh;

		if (rpc_nfs3_readlink_async(nfs->rpc, nfs_lookup_path_2_cb, &rl_args, data) != 0) {
			rpc_set_error(nfs->rpc, "RPC error: Failed to send READLINK call for %s", data->path);
			data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
			free_nfs_cb_data(data);
			return -1;
		}

		if (slash != NULL) {
			*slash = '/';
		}
		return 0;
	}

	if (slash != NULL) {
		/* Clear slash so that path is a zero terminated string for
		 * the current path component. Set it back to '/' again later
		 * when we are finished referencing this component so that
		 * data->saved_path will still point to the full
		 * normalized path.
		 */
		*slash = 0;
		data->path = slash+1;
	} else {
		while (*data->path != 0) {
		      data->path++;
		}
	}

	if (*path == 0) {
		data->fh.data.data_len = fh->data.data_len;
		data->fh.data.data_val = malloc(data->fh.data.data_len);
		if (data->fh.data.data_val == NULL) {
			rpc_set_error(nfs->rpc, "Out of memory: Failed to allocate fh for %s", data->path);
			data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
			free_nfs_cb_data(data);
			return -1;
		}
		memcpy(data->fh.data.data_val, fh->data.data_val, data->fh.data.data_len);
		if (slash != NULL) {
			*slash = '/';
		}
		data->continue_cb(nfs, attr, data);
		return 0;
	}

	memset(&args, 0, sizeof(LOOKUP3args));
	args.what.dir = *fh;
	args.what.name = path;

	if (rpc_nfs3_lookup_async(nfs->rpc, nfs_lookup_path_1_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send lookup call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	if (slash != NULL) {
		*slash = '/';
	}
	return 0;
}

static int nfs_normalize_path(struct nfs_context *nfs, char *path)
{
	char *str;
	int len;

	/* // -> / */
	while ((str = strstr(path, "//"))) {
		while(*str) {
			*str = *(str + 1);
			str++;
		}
	}

	/* /./ -> / */
	while ((str = strstr(path, "/./"))) {
		while(*(str + 1)) {
			*str = *(str + 2);
			str++;
		}
	}

	/* ^/../ -> error */
	if (!strncmp(path, "/../", 4)) {
		rpc_set_error(nfs->rpc,
			"Absolute path starts with '/../' "
			"during normalization");
		return -1;
	}

	/* ^[^/] -> error */
	if (path[0] != '/') {
		rpc_set_error(nfs->rpc,
			"Absolute path does not start with '/'");
		return -1;
	}

	/* /string/../ -> / */
	while ((str = strstr(path, "/../"))) {
		char *tmp;

		if (!strncmp(path, "/../", 4)) {
			rpc_set_error(nfs->rpc,
				"Absolute path starts with '/../' "
				"during normalization");
			return -1;
		}

		tmp = str - 1;
		while (*tmp != '/') {
			tmp--;
		}
		str += 3;
		while((*(tmp++) = *(str++)) != '\0')
			;
	}

	/* /$ -> \0 */
	len = strlen(path);
	if (len > 1) {
		if (path[len - 1] == '/') {
			path[len - 1] = '\0';
			len--;
		}
	}
	if (path[0] == '\0') {
		rpc_set_error(nfs->rpc,
			"Absolute path became '' "
			"during normalization");
		return -1;
	}

	/* /.$ -> \0 */
	if (len >= 2) {
		if (!strcmp(&path[len - 2], "/.")) {
			path[len - 2] = '\0';
			len -= 2;
		}
	}

	/* ^/..$ -> error */
	if (!strcmp(path, "/..")) {
		rpc_set_error(nfs->rpc,
			"Absolute path is '/..' "
			"during normalization");
		return -1;
	}

	/* /string/..$ -> / */
	if (len >= 3) {
		if (!strcmp(&path[len - 3], "/..")) {
			char *tmp = &path[len - 3];
			while (*--tmp != '/')
				;
			*tmp = '\0';
		}
	}

	return 0;
}

static void nfs_lookup_path_getattr_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	GETATTR3res *res;
	fattr3 *attr;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: GETATTR of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	attr = &res->GETATTR3res_u.resok.obj_attributes;
	/* This function will always invoke the callback and cleanup
	 * for failures. So no need to check the return value.
	 */
	nfs_lookup_path_async_internal(nfs, attr, data, &nfs->rootfh);
}

static int nfs_lookuppath_async(struct nfs_context *nfs, const char *path, int no_follow, nfs_cb cb, void *private_data, continue_func continue_cb, void *continue_data, void (*free_continue_data)(void *), uint64_t continue_int)
{
	struct nfs_cb_data *data;
	struct GETATTR3args args;
	struct nfs_fh3 *fh;

	if (path[0] == '\0') {
		path = ".";
	}

	data = malloc(sizeof(struct nfs_cb_data));
	if (data == NULL) {
		rpc_set_error(nfs->rpc, "out of memory: failed to allocate "
			"nfs_cb_data structure");
		if (free_continue_data)
			free_continue_data(continue_data);
		return -1;
	}
	memset(data, 0, sizeof(struct nfs_cb_data));
	data->nfs                = nfs;
	data->cb                 = cb;
	data->continue_cb        = continue_cb;
	data->continue_data      = continue_data;
	data->free_continue_data = free_continue_data;
	data->continue_int       = continue_int;
	data->private_data       = private_data;
	data->no_follow          = no_follow;
	if (path[0] == '/') {
		data->saved_path = strdup(path);
	} else {
		data->saved_path = malloc(strlen(path) + strlen(nfs->cwd) + 2);
		if (data->saved_path == NULL) {
			rpc_set_error(nfs->rpc, "out of memory: failed to "
				"malloc path string");
			free_nfs_cb_data(data);
			return -1;
		}
		sprintf(data->saved_path, "%s/%s", nfs->cwd, path);
	}

	if (data->saved_path == NULL) {
		rpc_set_error(nfs->rpc, "out of memory: failed to copy path string");
		free_nfs_cb_data(data);
		return -1;
	}
	if (nfs_normalize_path(nfs, data->saved_path) != 0) {
		free_nfs_cb_data(data);
		return -1;
	}

	data->path = data->saved_path;
	fh = &nfs->rootfh;

	if (data->path[0]) {
		struct nested_mounts *mnt;
		/* Make sure we match on longest nested export.
		 * TODO: If we make sure the list is sorted we can skip this
		 * check and end the loop on first match.
		 */
		int max_match_len = 0;

		/* Do we need to switch to a different nested export ? */
		for (mnt = nfs->nested_mounts; mnt; mnt = mnt->next) {
			if (strlen(mnt->path) < max_match_len)
				continue;
			if (strncmp(mnt->path, data->saved_path,
				     strlen(mnt->path)))
				continue;
			if (data->saved_path[strlen(mnt->path)] != '\0'
			    && data->saved_path[strlen(mnt->path)] != '/')
				continue;

			data->saved_path = strdup(data->path
						  + strlen(mnt->path));
			free(data->path);
			data->path = data->saved_path;
			fh = &mnt->fh;
			max_match_len = strlen(mnt->path);
		}

		/* This function will always invoke the callback and cleanup
		 * for failures. So no need to check the return value.
		 */
		nfs_lookup_path_async_internal(nfs, NULL, data, fh);
		return 0;
	}

	/* We have a request for "", so just perform a GETATTR3 so we can
	 * return the attributes to the caller.
	 */
	memset(&args, 0, sizeof(GETATTR3args));
	args.object = *fh;
	if (rpc_nfs3_getattr_async(nfs->rpc, nfs_lookup_path_getattr_cb, &args, data) != 0) {
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}


/*
 * Async stat()
 */
static dev_t specdata3_to_rdev(struct specdata3 *rdev)
{
#ifdef makedev
	return makedev(rdev->specdata1, rdev->specdata2);
#else
	return 0;
#endif
}

static void nfs_stat_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	GETATTR3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
#ifdef WIN32
  struct __stat64 st;
#else
	struct stat st;
#endif

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: GETATTR of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	st.st_dev     = res->GETATTR3res_u.resok.obj_attributes.fsid;
        st.st_ino     = res->GETATTR3res_u.resok.obj_attributes.fileid;
        st.st_mode    = res->GETATTR3res_u.resok.obj_attributes.mode;
	switch (res->GETATTR3res_u.resok.obj_attributes.type) {
	case NF3REG:
		st.st_mode |= S_IFREG;
		break;
	case NF3DIR:
		st.st_mode |= S_IFDIR;
		break;
	case NF3BLK:
		st.st_mode |= S_IFBLK;
		break;
	case NF3CHR:
		st.st_mode |= S_IFCHR;
		break;
	case NF3LNK:
		st.st_mode |= S_IFLNK;
		break;
	case NF3SOCK:
		st.st_mode |= S_IFSOCK;
		break;
	case NF3FIFO:
		st.st_mode |= S_IFIFO;
		break;
	}
        st.st_nlink   = res->GETATTR3res_u.resok.obj_attributes.nlink;
        st.st_uid     = res->GETATTR3res_u.resok.obj_attributes.uid;
        st.st_gid     = res->GETATTR3res_u.resok.obj_attributes.gid;
	st.st_rdev    = specdata3_to_rdev(&res->GETATTR3res_u.resok.obj_attributes.rdev);
        st.st_size    = res->GETATTR3res_u.resok.obj_attributes.size;
#ifndef WIN32
        st.st_blksize = NFS_BLKSIZE;
	st.st_blocks  = (res->GETATTR3res_u.resok.obj_attributes.used + 512 - 1) / 512;
#endif//WIN32
        st.st_atime   = res->GETATTR3res_u.resok.obj_attributes.atime.seconds;
        st.st_mtime   = res->GETATTR3res_u.resok.obj_attributes.mtime.seconds;
        st.st_ctime   = res->GETATTR3res_u.resok.obj_attributes.ctime.seconds;
#ifdef HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
	st.st_atim.tv_nsec = res->GETATTR3res_u.resok.obj_attributes.atime.nseconds;
	st.st_mtim.tv_nsec = res->GETATTR3res_u.resok.obj_attributes.mtime.nseconds;
	st.st_ctim.tv_nsec = res->GETATTR3res_u.resok.obj_attributes.ctime.nseconds;
#endif

	data->cb(0, nfs, &st, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_stat_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	struct GETATTR3args args;

	memset(&args, 0, sizeof(GETATTR3args));
	args.object = data->fh;

	if (rpc_nfs3_getattr_async(nfs->rpc, nfs_stat_1_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send STAT GETATTR call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_stat_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data)
{
	if (nfs_lookuppath_async(nfs, path, 0, cb, private_data, nfs_stat_continue_internal, NULL, NULL, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}


/*
 * Async nfs_stat64()
 */
static void nfs_stat64_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	GETATTR3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct nfs_stat_64 st;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: GETATTR of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	st.nfs_dev     = res->GETATTR3res_u.resok.obj_attributes.fsid;
        st.nfs_ino     = res->GETATTR3res_u.resok.obj_attributes.fileid;
        st.nfs_mode    = res->GETATTR3res_u.resok.obj_attributes.mode;
	switch (res->GETATTR3res_u.resok.obj_attributes.type) {
	case NF3REG:
		st.nfs_mode |= S_IFREG;
		break;
	case NF3DIR:
		st.nfs_mode |= S_IFDIR;
		break;
	case NF3BLK:
		st.nfs_mode |= S_IFBLK;
		break;
	case NF3CHR:
		st.nfs_mode |= S_IFCHR;
		break;
	case NF3LNK:
		st.nfs_mode |= S_IFLNK;
		break;
	case NF3SOCK:
		st.nfs_mode |= S_IFSOCK;
		break;
	case NF3FIFO:
		st.nfs_mode |= S_IFIFO;
		break;
	}
        st.nfs_nlink   = res->GETATTR3res_u.resok.obj_attributes.nlink;
        st.nfs_uid     = res->GETATTR3res_u.resok.obj_attributes.uid;
        st.nfs_gid     = res->GETATTR3res_u.resok.obj_attributes.gid;
	st.nfs_rdev    = specdata3_to_rdev(&res->GETATTR3res_u.resok.obj_attributes.rdev);
        st.nfs_size    = res->GETATTR3res_u.resok.obj_attributes.size;
	st.nfs_blksize = NFS_BLKSIZE;
	st.nfs_blocks  = (res->GETATTR3res_u.resok.obj_attributes.used + 512 - 1) / 512;
        st.nfs_atime   = res->GETATTR3res_u.resok.obj_attributes.atime.seconds;
        st.nfs_mtime   = res->GETATTR3res_u.resok.obj_attributes.mtime.seconds;
        st.nfs_ctime   = res->GETATTR3res_u.resok.obj_attributes.ctime.seconds;
	st.nfs_atime_nsec = res->GETATTR3res_u.resok.obj_attributes.atime.nseconds;
	st.nfs_mtime_nsec = res->GETATTR3res_u.resok.obj_attributes.mtime.nseconds;
	st.nfs_ctime_nsec = res->GETATTR3res_u.resok.obj_attributes.ctime.nseconds;
	st.nfs_used    = res->GETATTR3res_u.resok.obj_attributes.used;

	data->cb(0, nfs, &st, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_stat64_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	struct GETATTR3args args;

	memset(&args, 0, sizeof(GETATTR3args));
	args.object = data->fh;

	if (rpc_nfs3_getattr_async(nfs->rpc, nfs_stat64_1_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send STAT GETATTR call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_stat64_async_internal(struct nfs_context *nfs, const char *path, int no_follow, nfs_cb cb, void *private_data)
{
	if (nfs_lookuppath_async(nfs, path, no_follow, cb, private_data, nfs_stat64_continue_internal, NULL, NULL, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}

int nfs_stat64_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data)
{
	return nfs_stat64_async_internal(nfs, path, 0, cb, private_data);
}

int nfs_lstat64_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data)
{
	return nfs_stat64_async_internal(nfs, path, 1, cb, private_data);
}

/*
 * Async open()
 */
static void nfs_open_trunc_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct nfsfh *nfsfh;
	SETATTR3res *res;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: Setattr failed with %s(%d)", nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	nfsfh = malloc(sizeof(struct nfsfh));
	if (nfsfh == NULL) {
		rpc_set_error(nfs->rpc, "NFS: Failed to allocate nfsfh structure");
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	memset(nfsfh, 0, sizeof(struct nfsfh));

	if (data->continue_int & O_SYNC) {
		nfsfh->is_sync = 1;
	}
	if (data->continue_int & O_APPEND) {
		nfsfh->is_append = 1;
	}

	/* steal the filehandle */
	nfsfh->fh = data->fh;
	data->fh.data.data_val = NULL;

	data->cb(0, nfs, nfsfh, data->private_data);
	free_nfs_cb_data(data);
}

static void nfs_open_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	ACCESS3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct nfsfh *nfsfh;
	unsigned int nfsmode = 0;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: ACCESS of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	if (data->continue_int & O_WRONLY) {
		nfsmode |= ACCESS3_MODIFY;
	}
	if (data->continue_int & O_RDWR) {
		nfsmode |= ACCESS3_READ|ACCESS3_MODIFY;
	}
	if (!(data->continue_int & (O_WRONLY|O_RDWR))) {
		nfsmode |= ACCESS3_READ;
	}


	if (res->ACCESS3res_u.resok.access != nfsmode) {
		rpc_set_error(nfs->rpc, "NFS: ACCESS denied. Required access %c%c%c. Allowed access %c%c%c",
					nfsmode&ACCESS3_READ?'r':'-',
					nfsmode&ACCESS3_MODIFY?'w':'-',
					nfsmode&ACCESS3_EXECUTE?'x':'-',
					res->ACCESS3res_u.resok.access&ACCESS3_READ?'r':'-',
					res->ACCESS3res_u.resok.access&ACCESS3_MODIFY?'w':'-',
					res->ACCESS3res_u.resok.access&ACCESS3_EXECUTE?'x':'-');
		data->cb(-EACCES, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	/* Try to truncate it if we were requested to */
	if ((data->continue_int & O_TRUNC) &&
	    (data->continue_int & (O_RDWR|O_WRONLY))) {
		SETATTR3args args;

		memset(&args, 0, sizeof(SETATTR3args));
		args.object = data->fh;
		args.new_attributes.size.set_it = 1;
		args.new_attributes.size.set_size3_u.size = 0;

		if (rpc_nfs3_setattr_async(nfs->rpc, nfs_open_trunc_cb, &args,
				data) != 0) {
			rpc_set_error(nfs->rpc, "RPC error: Failed to send "
				"SETATTR call for %s", data->path);
			data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc),
				data->private_data);
			free_nfs_cb_data(data);
			return;
		}
		return;
	}

	nfsfh = malloc(sizeof(struct nfsfh));
	if (nfsfh == NULL) {
		rpc_set_error(nfs->rpc, "NFS: Failed to allocate nfsfh structure");
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	memset(nfsfh, 0, sizeof(struct nfsfh));

	if (data->continue_int & O_SYNC) {
		nfsfh->is_sync = 1;
	}
	if (data->continue_int & O_APPEND) {
		nfsfh->is_append = 1;
	}

	/* steal the filehandle */
	nfsfh->fh = data->fh;
	data->fh.data.data_val = NULL;

	data->cb(0, nfs, nfsfh, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_open_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	int nfsmode = 0;
	ACCESS3args args;

	if (data->continue_int & O_WRONLY) {
		nfsmode |= ACCESS3_MODIFY;
	}
	if (data->continue_int & O_RDWR) {
		nfsmode |= ACCESS3_READ|ACCESS3_MODIFY;
	}
	if (!(data->continue_int & (O_WRONLY|O_RDWR))) {
		nfsmode |= ACCESS3_READ;
	}

	memset(&args, 0, sizeof(ACCESS3args));
	args.object = data->fh;
	args.access = nfsmode;

	if (rpc_nfs3_access_async(nfs->rpc, nfs_open_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send OPEN ACCESS "
				"call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc),
				data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_open_async(struct nfs_context *nfs, const char *path, int flags, nfs_cb cb, void *private_data)
{
	if (nfs_lookuppath_async(nfs, path, 0, cb, private_data, nfs_open_continue_internal, NULL, NULL, flags) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}


/*
 * Async chdir()
 */
static int nfs_chdir_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	/* steal saved_path */
	free(nfs->cwd);
	nfs->cwd = data->saved_path;
	data->saved_path = NULL;

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);

	return 0;
}

int nfs_chdir_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data)
{
	if (nfs_lookuppath_async(nfs, path, 0, cb, private_data, nfs_chdir_continue_internal, NULL, NULL, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}


/*
 * Async pread()
 */
static void nfs_fill_READ3args(READ3args *args, struct nfsfh *fh, uint64_t offset, uint64_t count)
{
	memset(args, 0, sizeof(READ3args));
	args->file = fh->fh;
	args->offset = offset;
	args->count = count;
}

static void nfs_pread_mcb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_mcb_data *mdata = private_data;
	struct nfs_cb_data *data = mdata->data;
	struct nfs_context *nfs = data->nfs;
	READ3res *res;
	int cb_err;
	void *cb_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	data->num_calls--;

	if (status == RPC_STATUS_ERROR) {
		/* flag the failure but do not invoke callback until we have received all responses */
		data->error = 1;
	}
	if (status == RPC_STATUS_CANCEL) {
		/* flag the cancellation but do not invoke callback until we have received all responses */
		data->cancel = 1;
	}

	if (status == RPC_STATUS_SUCCESS) {
		res = command_data;
		if (res->status != NFS3_OK) {
			rpc_set_error(nfs->rpc, "NFS: Read failed with %s(%d)", nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
			data->error = 1;
		} else {
			uint64_t count = res->READ3res_u.resok.count;

			if (mdata->update_pos)
				data->nfsfh->offset += count;

			/* if we have more than one call or we have received a short read we need a reassembly buffer */
			if (data->num_calls || (count < mdata->count && !res->READ3res_u.resok.eof)) {
				if (data->buffer == NULL) {
					data->buffer = 	malloc(data->count);
					if (data->buffer == NULL) {
						rpc_set_error(nfs->rpc, "Out-Of-Memory: Failed to allocate reassembly buffer for %d bytes", (int)data->count);
						data->oom = 1;
					}
				}
			}
			if (count > 0) {
				if (count <= mdata->count) {
					/* copy data into reassembly buffer if we have one */
					if (data->buffer != NULL) {
						memcpy(&data->buffer[mdata->offset - data->offset], res->READ3res_u.resok.data.data_val, count);
					}
					if (data->max_offset < mdata->offset + count) {
						data->max_offset = mdata->offset + count;
					}
				} else {
					rpc_set_error(nfs->rpc, "NFS: Read overflow. Server has sent more data than requested!");
					data->error = 1;
				}
			}
			/* check if we have received a short read */
			if (count < mdata->count && !res->READ3res_u.resok.eof) {
				if (count == 0) {
					rpc_set_error(nfs->rpc, "NFS: Read failed. No bytes read and not at EOF!");
					data->error = 1;
				} else {
					/* reissue reminder of this read request */
					READ3args args;
					mdata->offset += count;
					mdata->count -= count;
					nfs_fill_READ3args(&args, data->nfsfh, mdata->offset, mdata->count);
					if (rpc_nfs3_read_async(nfs->rpc, nfs_pread_mcb, &args, mdata) == 0) {
						data->num_calls++;
						return;
					} else {
						rpc_set_error(nfs->rpc, "RPC error: Failed to send READ call for %s", data->path);
						data->oom = 1;
					}
				}
			}
		}
	}

	free(mdata);

	if (data->num_calls > 0) {
		/* still waiting for more replies */
		return;
	}
	if (data->oom != 0) {
		data->cb(-ENOMEM, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (data->error != 0) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (data->cancel != 0) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	if (data->buffer) {
		if (data->max_offset > data->org_offset + data->org_count) {
			data->max_offset = data->org_offset + data->org_count;
		}
		cb_err = data->max_offset - data->org_offset;
		cb_data = data->buffer + (data->org_offset - data->offset);
	} else {
		res = command_data;
		cb_err = res->READ3res_u.resok.count;
		cb_data = res->READ3res_u.resok.data.data_val;
	}

	data->nfsfh->ra.fh_offset = data->max_offset;
	if (data->nfsfh->ra.cur_ra) {
		free(data->nfsfh->ra.buf);
		data->nfsfh->ra.buf = data->buffer;
		data->nfsfh->ra.buf_offset = data->offset;
		data->nfsfh->ra.buf_count = data->count;
		data->nfsfh->ra.buf_ts = time(NULL);
		data->buffer = NULL;
	}

	data->cb(cb_err, nfs, cb_data, data->private_data);
	free_nfs_cb_data(data);
}

static void nfs_ra_invalidate(struct nfsfh *nfsfh) {
	free(nfsfh->ra.buf);
	nfsfh->ra.buf = NULL;
	nfsfh->ra.buf_offset = 0;
	nfsfh->ra.buf_count = 0;
	nfsfh->ra.buf_ts = time(NULL);
	nfsfh->ra.cur_ra = NFS_BLKSIZE;
}

static int nfs_pread_async_internal(struct nfs_context *nfs, struct nfsfh *nfsfh, uint64_t offset, uint64_t count, nfs_cb cb, void *private_data, int update_pos)
{
	struct nfs_cb_data *data;

	data = malloc(sizeof(struct nfs_cb_data));
	if (data == NULL) {
		rpc_set_error(nfs->rpc, "out of memory: failed to allocate nfs_cb_data structure");
		return -1;
	}
	memset(data, 0, sizeof(struct nfs_cb_data));
	data->nfs          = nfs;
	data->cb           = cb;
	data->private_data = private_data;
	data->nfsfh        = nfsfh;
	data->org_offset   = offset;
	data->org_count    = count;

	assert(data->num_calls == 0);

	if (nfs->rpc->readahead && time(NULL) - nfsfh->ra.buf_ts > NFS_RA_TIMEOUT) {
		/* readahead cache timeout */
		nfs_ra_invalidate(nfsfh);
	}

	if (nfs->rpc->readahead) {
		if (offset >= nfsfh->ra.last_offset &&
			offset - NFS_BLKSIZE <= nfsfh->ra.fh_offset + nfsfh->ra.cur_ra) {
			if (nfs->rpc->readahead > nfsfh->ra.cur_ra) {
				nfsfh->ra.cur_ra <<= 1;
			}
		} else {
			nfsfh->ra.cur_ra = NFS_BLKSIZE;
		}

		nfsfh->ra.last_offset = offset;

		if (nfsfh->ra.buf_offset <= offset &&
			nfsfh->ra.buf_offset + nfsfh->ra.buf_count >= offset + count) {
			/* serve request completely from cache */
			data->buffer = malloc(count);
			if (data->buffer == NULL) {
				free_nfs_cb_data(data);
				return -ENOMEM;
			}
			memcpy(data->buffer, nfsfh->ra.buf + (offset - nfsfh->ra.buf_offset), count);
			data->cb(count, nfs, data->buffer, data->private_data);
			nfsfh->ra.fh_offset = offset + count;
			free_nfs_cb_data(data);
			return 0;
		}

		/* align start offset to blocksize */
		count += offset & (NFS_BLKSIZE - 1);
		offset &= ~(NFS_BLKSIZE - 1);

		/* align end offset to blocksize and add readahead */
		count += nfsfh->ra.cur_ra - 1;
		count &= ~(NFS_BLKSIZE - 1);

		data->buffer = malloc(count);
		if (data->buffer == NULL) {
			free_nfs_cb_data(data);
			return -ENOMEM;
		}
		data->offset = offset;
		data->count = count;

		if (nfsfh->ra.buf_count && nfsfh->ra.buf_offset <= offset &&
			nfsfh->ra.buf_offset + nfsfh->ra.buf_count >= offset) {
			/* serve request partially from cache */
			size_t overlap = (nfsfh->ra.buf_offset + nfsfh->ra.buf_count) - offset;
			if (overlap > count) count = overlap;
			memcpy(data->buffer, nfsfh->ra.buf + (offset - nfsfh->ra.buf_offset), overlap);
			offset += overlap;
			count -= overlap;
		}
	} else {
		data->offset = offset;
		data->count = count;
	}

	data->max_offset = offset;

	/* chop requests into chunks of at most READMAX bytes if necessary.
	 * we send all reads in parallel so that performance is still good.
	 */
	do {
		uint64_t readcount = count;
		struct nfs_mcb_data *mdata;
		READ3args args;

		if (readcount > nfs_get_readmax(nfs)) {
			readcount = nfs_get_readmax(nfs);
		}

		mdata = malloc(sizeof(struct nfs_mcb_data));
		if (mdata == NULL) {
			rpc_set_error(nfs->rpc, "out of memory: failed to allocate nfs_mcb_data structure");
			if (data->num_calls == 0) {
				free_nfs_cb_data(data);
				return -1;
			}
			data->oom = 1;
			break;
		}
		memset(mdata, 0, sizeof(struct nfs_mcb_data));
		mdata->data   = data;
		mdata->offset = offset;
		mdata->count  = readcount;
		mdata->update_pos = update_pos;

		nfs_fill_READ3args(&args, nfsfh, offset, readcount);

		if (rpc_nfs3_read_async(nfs->rpc, nfs_pread_mcb, &args, mdata) != 0) {
			rpc_set_error(nfs->rpc, "RPC error: Failed to send READ call for %s", data->path);
			free(mdata);
			if (data->num_calls == 0) {
				free_nfs_cb_data(data);
				return -1;
			}
			data->oom = 1;
			break;
		}

		count               -= readcount;
		offset              += readcount;
		data->num_calls++;
	 } while (count > 0);

	 return 0;
}

int nfs_pread_async(struct nfs_context *nfs, struct nfsfh *nfsfh, uint64_t offset, uint64_t count, nfs_cb cb, void *private_data)
{
	return nfs_pread_async_internal(nfs, nfsfh, offset, count, cb, private_data, 0);
}

/*
 * Async read()
 */
int nfs_read_async(struct nfs_context *nfs, struct nfsfh *nfsfh, uint64_t count, nfs_cb cb, void *private_data)
{
	return nfs_pread_async_internal(nfs, nfsfh, nfsfh->offset, count, cb, private_data, 1);
}



/*
 * Async pwrite()
 */
static void nfs_fill_WRITE3args (WRITE3args *args, struct nfsfh *fh, uint64_t offset, uint64_t count,
                                 void *buf)
{
	memset(args, 0, sizeof(WRITE3args));
	args->file = fh->fh;
	args->offset = offset;
	args->count  = count;
	args->stable = fh->is_sync ? FILE_SYNC : UNSTABLE;
	args->data.data_len = count;
	args->data.data_val = buf;
}

static void nfs_pwrite_mcb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_mcb_data *mdata = private_data;
	struct nfs_cb_data *data = mdata->data;
	struct nfs_context *nfs = data->nfs;
	WRITE3res *res;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	data->num_calls--;

	if (status == RPC_STATUS_ERROR) {
		/* flag the failure but do not invoke callback until we have received all responses */
		data->error = 1;
	}
	if (status == RPC_STATUS_CANCEL) {
		/* flag the cancellation but do not invoke callback until we have received all responses */
		data->cancel = 1;
	}

	if (status == RPC_STATUS_SUCCESS) {
		res = command_data;
		if (res->status != NFS3_OK) {
			rpc_set_error(nfs->rpc, "NFS: Write failed with %s(%d)", nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
			data->error = 1;
		} else  {
			uint64_t count = res->WRITE3res_u.resok.count;

			if (mdata->update_pos)
				data->nfsfh->offset += count;

			if (count < mdata->count) {
				if (count == 0) {
					rpc_set_error(nfs->rpc, "NFS: Write failed. No bytes written!");
					data->error = 1;
				} else {
					/* reissue reminder of this write request */
					WRITE3args args;
					mdata->offset += count;
					mdata->count -= count;

					nfs_fill_WRITE3args(&args, data->nfsfh, mdata->offset, mdata->count,
										&data->usrbuf[mdata->offset - data->offset]);
					if (rpc_nfs3_write_async(nfs->rpc, nfs_pwrite_mcb, &args, mdata) == 0) {
						data->num_calls++;
						return;
					} else {
						rpc_set_error(nfs->rpc, "RPC error: Failed to send WRITE call for %s", data->path);
						data->oom = 1;
					}
				}
			}
			if (count > 0) {
				if (data->max_offset < mdata->offset + count) {
					data->max_offset = mdata->offset + count;
				}
			}
		}
	}

	free(mdata);

	if (data->num_calls > 0) {
		/* still waiting for more replies */
		return;
	}
	if (data->oom != 0) {
		data->cb(-ENOMEM, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (data->error != 0) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (data->cancel != 0) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(data->max_offset - data->offset, nfs, NULL, data->private_data);

	free_nfs_cb_data(data);
}


static int nfs_pwrite_async_internal(struct nfs_context *nfs, struct nfsfh *nfsfh, uint64_t offset, uint64_t count, char *buf, nfs_cb cb, void *private_data, int update_pos)
{
	struct nfs_cb_data *data;

	data = malloc(sizeof(struct nfs_cb_data));
	if (data == NULL) {
		rpc_set_error(nfs->rpc, "out of memory: failed to allocate nfs_cb_data structure");
		return -1;
	}
	memset(data, 0, sizeof(struct nfs_cb_data));
	data->nfs          = nfs;
	data->cb           = cb;
	data->private_data = private_data;
	data->nfsfh        = nfsfh;
	data->usrbuf       = buf;

	/* hello, clang-analyzer */
	assert(data->num_calls == 0);

	/* chop requests into chunks of at most WRITEMAX bytes if necessary.
	 * we send all writes in parallel so that performance is still good.
	 */
	data->max_offset = offset;
	data->offset = offset;

	do {
		uint64_t writecount = count;
		struct nfs_mcb_data *mdata;
		WRITE3args args;

		if (writecount > nfs_get_writemax(nfs)) {
			writecount = nfs_get_writemax(nfs);
		}

		mdata = malloc(sizeof(struct nfs_mcb_data));
		if (mdata == NULL) {
			rpc_set_error(nfs->rpc, "out of memory: failed to allocate nfs_mcb_data structure");
			if (data->num_calls == 0) {
				free_nfs_cb_data(data);
				return -1;
			}
			data->oom = 1;
			break;
		}
		memset(mdata, 0, sizeof(struct nfs_mcb_data));
		mdata->data   = data;
		mdata->offset = offset;
		mdata->count  = writecount;
		mdata->update_pos = update_pos;

		nfs_fill_WRITE3args(&args, nfsfh, offset, writecount, &buf[offset - data->offset]);

		if (rpc_nfs3_write_async(nfs->rpc, nfs_pwrite_mcb, &args, mdata) != 0) {
			rpc_set_error(nfs->rpc, "RPC error: Failed to send WRITE call for %s", data->path);
			free(mdata);
			if (data->num_calls == 0) {
				free_nfs_cb_data(data);
				return -1;
			}
			data->oom = 1;
			break;
		}

		count               -= writecount;
		offset              += writecount;
		data->num_calls++;
	} while (count > 0);

	return 0;
}

int nfs_pwrite_async(struct nfs_context *nfs, struct nfsfh *nfsfh, uint64_t offset, uint64_t count, char *buf, nfs_cb cb, void *private_data)
{
	return nfs_pwrite_async_internal(nfs, nfsfh, offset, count, buf, cb, private_data, 0);
}

/*
 * Async write()
 */
static void nfs_write_append_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	GETATTR3res *res;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: GETATTR failed with %s(%d)", nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	if (nfs_pwrite_async_internal(nfs, data->nfsfh, res->GETATTR3res_u.resok.obj_attributes.size, data->count, data->usrbuf, data->cb, data->private_data, 1) != 0) {
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	free_nfs_cb_data(data);
}

int nfs_write_async(struct nfs_context *nfs, struct nfsfh *nfsfh, uint64_t count, char *buf, nfs_cb cb, void *private_data)
{
	nfs_ra_invalidate(nfsfh);
	if (nfsfh->is_append) {
		struct GETATTR3args args;
		struct nfs_cb_data *data;

		data = malloc(sizeof(struct nfs_cb_data));
		if (data == NULL) {
			rpc_set_error(nfs->rpc, "out of memory: failed to allocate nfs_cb_data structure");
			return -1;
		}
		memset(data, 0, sizeof(struct nfs_cb_data));
		data->nfs           = nfs;
		data->cb            = cb;
		data->private_data  = private_data;
		data->nfsfh         = nfsfh;
		data->usrbuf	    = buf;
		data->count         = count;

		memset(&args, 0, sizeof(GETATTR3args));
		args.object = nfsfh->fh;

		if (rpc_nfs3_getattr_async(nfs->rpc, nfs_write_append_cb, &args, data) != 0) {
			rpc_set_error(nfs->rpc, "out of memory: failed to send GETATTR");
			free_nfs_cb_data(data);
			return -1;
		}
		return 0;
	}
	return nfs_pwrite_async_internal(nfs, nfsfh, nfsfh->offset, count, buf, cb, private_data, 1);
}




/*
 * close
 */

int nfs_close_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb, void *private_data)
{
	free_nfsfh(nfsfh);
	cb(0, nfs, NULL, private_data);
	return 0;
};





/*
 * Async fstat()
 */
int nfs_fstat_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb, void *private_data)
{
	struct nfs_cb_data *data;
	struct GETATTR3args args;

	data = malloc(sizeof(struct nfs_cb_data));
	if (data == NULL) {
		rpc_set_error(nfs->rpc, "out of memory: failed to allocate nfs_cb_data structure");
		return -1;
	}
	memset(data, 0, sizeof(struct nfs_cb_data));
	data->nfs          = nfs;
	data->cb           = cb;
	data->private_data = private_data;

	memset(&args, 0, sizeof(GETATTR3args));
	args.object = nfsfh->fh;

	if (rpc_nfs3_getattr_async(nfs->rpc, nfs_stat_1_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send STAT GETATTR call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

/*
 * Async fstat64()
 */
int nfs_fstat64_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb, void *private_data)
{
	struct nfs_cb_data *data;
	struct GETATTR3args args;

	data = malloc(sizeof(struct nfs_cb_data));
	if (data == NULL) {
		rpc_set_error(nfs->rpc, "out of memory: failed to allocate nfs_cb_data structure");
		return -1;
	}
	memset(data, 0, sizeof(struct nfs_cb_data));
	data->nfs          = nfs;
	data->cb           = cb;
	data->private_data = private_data;

	memset(&args, 0, sizeof(GETATTR3args));
	args.object = nfsfh->fh;

	if (rpc_nfs3_getattr_async(nfs->rpc, nfs_stat64_1_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send STAT GETATTR call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}



/*
 * Async fsync()
 */
static void nfs_fsync_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	COMMIT3res *res;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: Commit failed with %s(%d)", nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

int nfs_fsync_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb, void *private_data)
{
	struct nfs_cb_data *data;
	struct COMMIT3args args;

	data = malloc(sizeof(struct nfs_cb_data));
	if (data == NULL) {
		rpc_set_error(nfs->rpc, "out of memory: failed to allocate nfs_cb_data structure");
		return -1;
	}
	memset(data, 0, sizeof(struct nfs_cb_data));
	data->nfs          = nfs;
	data->cb           = cb;
	data->private_data = private_data;

	args.file = nfsfh->fh;
	args.offset = 0;
	args.count = 0;
	if (rpc_nfs3_commit_async(nfs->rpc, nfs_fsync_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send COMMIT call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}




/*
 * Async ftruncate()
 */
static void nfs_ftruncate_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	SETATTR3res *res;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: Setattr failed with %s(%d)", nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

int nfs_ftruncate_async(struct nfs_context *nfs, struct nfsfh *nfsfh, uint64_t length, nfs_cb cb, void *private_data)
{
	struct nfs_cb_data *data;
	SETATTR3args args;

	data = malloc(sizeof(struct nfs_cb_data));
	if (data == NULL) {
		rpc_set_error(nfs->rpc, "out of memory: failed to allocate nfs_cb_data structure");
		return -1;
	}
	memset(data, 0, sizeof(struct nfs_cb_data));
	data->nfs          = nfs;
	data->cb           = cb;
	data->private_data = private_data;

	memset(&args, 0, sizeof(SETATTR3args));
	args.object = nfsfh->fh;
	args.new_attributes.size.set_it = 1;
	args.new_attributes.size.set_size3_u.size = length;

	if (rpc_nfs3_setattr_async(nfs->rpc, nfs_ftruncate_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send SETATTR call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}


/*
 * Async truncate()
 */
static int nfs_truncate_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	uint64_t offset = data->continue_int;
	struct nfsfh nfsfh;

	nfsfh.fh = data->fh;

	if (nfs_ftruncate_async(nfs, &nfsfh, offset, data->cb, data->private_data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send SETATTR call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	free_nfs_cb_data(data);
	return 0;
}

int nfs_truncate_async(struct nfs_context *nfs, const char *path, uint64_t length, nfs_cb cb, void *private_data)
{
	uint64_t offset;

	offset = length;

	if (nfs_lookuppath_async(nfs, path, 0, cb, private_data, nfs_truncate_continue_internal, NULL, NULL, offset) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}




/*
 * Async mkdir()
 */
static void nfs_mkdir_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	MKDIR3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	char *str = data->continue_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	str = &str[strlen(str) + 1];

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: MKDIR of %s/%s failed with %s(%d)", data->saved_path, str, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_mkdir_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	char *str = data->continue_data;
	MKDIR3args args;

	str = &str[strlen(str) + 1];

	memset(&args, 0, sizeof(MKDIR3args));
	args.where.dir = data->fh;
	args.where.name = str;
	args.attributes.mode.set_it = 1;
	args.attributes.mode.set_mode3_u.mode = 0755;

	if (rpc_nfs3_mkdir_async(nfs->rpc, nfs_mkdir_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send MKDIR call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_mkdir_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data)
{
	char *new_path;
	char *ptr;

	new_path = strdup(path);
	if (new_path == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate mode buffer for path");
		return -1;
	}

	ptr = strrchr(new_path, '/');
	if (ptr == NULL) {
		free(new_path);
		rpc_set_error(nfs->rpc, "Invalid path %s", path);
		return -1;
	}
	*ptr = 0;

	/* new_path now points to the parent directory,  and beyond the nul terminateor is the new directory to create */
	if (nfs_lookuppath_async(nfs, new_path, 0, cb, private_data, nfs_mkdir_continue_internal, new_path, free, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path component");
		return -1;
	}

	return 0;
}





/*
 * Async rmdir()
 */
static void nfs_rmdir_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	RMDIR3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	char *str = data->continue_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	str = &str[strlen(str) + 1];

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: RMDIR of %s/%s failed with %s(%d)", data->saved_path, str, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_rmdir_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	char *str = data->continue_data;
	RMDIR3args args;

	str = &str[strlen(str) + 1];

	args.object.dir = data->fh;
	args.object.name = str;
	if (rpc_nfs3_rmdir_async(nfs->rpc, nfs_rmdir_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send RMDIR call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_rmdir_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data)
{
	char *new_path;
	char *ptr;

	new_path = strdup(path);
	if (new_path == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate mode buffer for path");
		return -1;
	}

	ptr = strrchr(new_path, '/');
	if (ptr == NULL) {
		free(new_path);
		rpc_set_error(nfs->rpc, "Invalid path %s", path);
		return -1;
	}
	*ptr = 0;

	/* new_path now points to the parent directory,  and beyond the nul terminateor is the new directory to create */
	if (nfs_lookuppath_async(nfs, new_path, 0, cb, private_data, nfs_rmdir_continue_internal, new_path, free, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}




/*
 * Async creat()
 */
struct create_cb_data {
       char *path;
       int flags;
       int mode;
};

static void free_create_cb_data(void *ptr)
{
	struct create_cb_data *data = ptr;

	free(data->path);
	free(data);
}

static void nfs_create_trunc_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct nfsfh *nfsfh = data->nfsfh;
	SETATTR3res *res;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		free_nfsfh(nfsfh);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		free_nfsfh(nfsfh);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: Setattr failed with %s(%d)", nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		free_nfsfh(nfsfh);
		return;
	}

	data->cb(0, nfs, nfsfh, data->private_data);
	free_nfs_cb_data(data);
}

static void nfs_create_2_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	LOOKUP3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct nfsfh *nfsfh;
	struct create_cb_data *cb_data = data->continue_data;
	char *str = cb_data->path;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	str = &str[strlen(str) + 1];
	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: CREATE of %s/%s failed with %s(%d)", data->saved_path, str, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);

		return;
	}

	nfsfh = malloc(sizeof(struct nfsfh));
	if (nfsfh == NULL) {
		rpc_set_error(nfs->rpc, "NFS: Failed to allocate nfsfh structure");
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	memset(nfsfh, 0, sizeof(struct nfsfh));

	if (cb_data->flags & O_SYNC) {
		nfsfh->is_sync = 1;
	}
	if (cb_data->flags & O_APPEND) {
		nfsfh->is_append = 1;
	}

	/* copy the filehandle */
	nfsfh->fh.data.data_len = res->LOOKUP3res_u.resok.object.data.data_len;
	nfsfh->fh.data.data_val = malloc(nfsfh->fh.data.data_len);
	if (nfsfh->fh.data.data_val == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory: Failed to allocate fh structure");
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		free(nfsfh);
		return;
	}
	memcpy(nfsfh->fh.data.data_val, res->LOOKUP3res_u.resok.object.data.data_val, nfsfh->fh.data.data_len);

	/* Try to truncate it if we were requested to */
	if (cb_data->flags & O_TRUNC) {
		SETATTR3args args;

		data->nfsfh = nfsfh;

		memset(&args, 0, sizeof(SETATTR3args));
		args.object = nfsfh->fh;
		args.new_attributes.size.set_it = 1;
		args.new_attributes.size.set_size3_u.size = 0;

		if (rpc_nfs3_setattr_async(nfs->rpc, nfs_create_trunc_cb,
				&args, data) != 0) {
			rpc_set_error(nfs->rpc, "RPC error: Failed to send "
				"SETATTR call for %s", data->path);
			data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc),
				data->private_data);
			free_nfs_cb_data(data);
			free_nfsfh(nfsfh);
			return;
		}
		return;
	}

	data->cb(0, nfs, nfsfh, data->private_data);
	free_nfs_cb_data(data);
}



static void nfs_create_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	CREATE3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct create_cb_data *cb_data = data->continue_data;
	char *str = cb_data->path;
	LOOKUP3args args;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	str = &str[strlen(str) + 1];
	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: CREATE of %s/%s failed with %s(%d)", data->saved_path, str, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	memset(&args, 0, sizeof(LOOKUP3args));
	args.what.dir = data->fh;
	args.what.name = str;

	if (rpc_nfs3_lookup_async(nfs->rpc, nfs_create_2_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send lookup call for %s/%s", data->saved_path, str);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	return;
}

static int nfs_create_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	struct create_cb_data *cb_data = data->continue_data;
	char *str = cb_data->path;
	CREATE3args args;

	str = &str[strlen(str) + 1];

	memset(&args, 0, sizeof(CREATE3args));
	args.where.dir = data->fh;
	args.where.name = str;
	args.how.mode = (cb_data->flags & O_EXCL) ? GUARDED : UNCHECKED;
	args.how.createhow3_u.obj_attributes.mode.set_it = 1;
	args.how.createhow3_u.obj_attributes.mode.set_mode3_u.mode = cb_data->mode;

	if (rpc_nfs3_create_async(nfs->rpc, nfs_create_1_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send CREATE call for %s/%s", data->path, str);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_create_async(struct nfs_context *nfs, const char *path, int flags, int mode, nfs_cb cb, void *private_data)
{
	struct create_cb_data *cb_data;
	char *ptr;

	cb_data = malloc(sizeof(struct create_cb_data));
	if (cb_data == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate mode buffer for cb data");
		return -1;
	}

	cb_data->path = strdup(path);
	if (cb_data->path == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate mode buffer for path");
		free(cb_data);
		return -1;
	}

	ptr = strrchr(cb_data->path, '/');
	if (ptr == NULL) {
		rpc_set_error(nfs->rpc, "Invalid path %s", path);
		free_create_cb_data(cb_data);
		return -1;
	}
	*ptr = 0;

	cb_data->flags = flags;
	cb_data->mode = mode;

	/* new_path now points to the parent directory,  and beyond the nul terminator is the new directory to create */
	if (nfs_lookuppath_async(nfs, cb_data->path, 0, cb, private_data, nfs_create_continue_internal, cb_data, free_create_cb_data, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}

int nfs_creat_async(struct nfs_context *nfs, const char *path, int mode, nfs_cb cb, void *private_data)
{
	return nfs_create_async(nfs, path, 0, mode, cb, private_data);
}




/*
 * Async unlink()
 */
static void nfs_unlink_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	REMOVE3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	char *str = data->continue_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	str = &str[strlen(str) + 1];

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: REMOVE of %s/%s failed with %s(%d)", data->saved_path, str, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_unlink_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	char *str = data->continue_data;
	struct REMOVE3args args;

	str = &str[strlen(str) + 1];

	args.object.dir = data->fh;
	args.object.name = str;
	if (rpc_nfs3_remove_async(nfs->rpc, nfs_unlink_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send REMOVE call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_unlink_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data)
{
	char *new_path;
	char *ptr;

	new_path = strdup(path);
	if (new_path == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate mode buffer for path");
		return -1;
	}

	ptr = strrchr(new_path, '/');
	if (ptr == NULL) {
		free(new_path);
		rpc_set_error(nfs->rpc, "Invalid path %s", path);
		return -1;
	}
	*ptr = 0;

	/* new_path now points to the parent directory,  and beyond the nul terminateor is the new directory to create */
	if (nfs_lookuppath_async(nfs, new_path, 0, cb, private_data, nfs_unlink_continue_internal, new_path, free, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}


/*
 * Async mknod()
 */
struct mknod_cb_data {
       char *path;
       int mode;
       int major;
       int minor;
};

static void free_mknod_cb_data(void *ptr)
{
	struct mknod_cb_data *data = ptr;

	free(data->path);
	free(data);
}

static void nfs_mknod_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	MKNOD3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	char *str = data->continue_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	str = &str[strlen(str) + 1];

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: MKNOD of %s/%s failed with %s(%d)", data->saved_path, str, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_mknod_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	struct mknod_cb_data *cb_data = data->continue_data;
	char *str = cb_data->path;
	MKNOD3args args;

	str = &str[strlen(str) + 1];

	args.where.dir = data->fh;
	args.where.name = str;
	switch (cb_data->mode & S_IFMT) {
	case S_IFCHR:
		args.what.type = NF3CHR;
		args.what.mknoddata3_u.chr_device.dev_attributes.mode.set_it = 1;
		args.what.mknoddata3_u.chr_device.dev_attributes.mode.set_mode3_u.mode = cb_data->mode & (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
		args.what.mknoddata3_u.chr_device.spec.specdata1 = cb_data->major;
		args.what.mknoddata3_u.chr_device.spec.specdata2 = cb_data->minor;
		break;
	case S_IFBLK:
		args.what.type = NF3BLK;
		args.what.mknoddata3_u.blk_device.dev_attributes.mode.set_it = 1;
		args.what.mknoddata3_u.blk_device.dev_attributes.mode.set_mode3_u.mode = cb_data->mode & (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
		args.what.mknoddata3_u.blk_device.spec.specdata1 = cb_data->major;
		args.what.mknoddata3_u.blk_device.spec.specdata2 = cb_data->minor;
	case S_IFSOCK:
		args.what.type = NF3SOCK;
		args.what.mknoddata3_u.sock_attributes.mode.set_it = 1;
		args.what.mknoddata3_u.sock_attributes.mode.set_mode3_u.mode = cb_data->mode & (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
		break;
	case S_IFIFO:
		args.what.type = NF3FIFO;
		args.what.mknoddata3_u.pipe_attributes.mode.set_it = 1;
		args.what.mknoddata3_u.pipe_attributes.mode.set_mode3_u.mode = cb_data->mode & (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
		break;
	default:
		rpc_set_error(nfs->rpc, "Invalid file type for NFS3/MKNOD call");
		data->cb(-EINVAL, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}

	if (rpc_nfs3_mknod_async(nfs->rpc, nfs_mknod_cb, &args, data) != 0) {
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_mknod_async(struct nfs_context *nfs, const char *path, int mode, int dev, nfs_cb cb, void *private_data)
{
	char *ptr;
	struct mknod_cb_data *cb_data;

	cb_data = malloc(sizeof(struct mknod_cb_data));
	if (cb_data == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate mode buffer for cb data");
		return -1;
	}

	cb_data->path = strdup(path);
	if (cb_data->path == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate mode buffer for path");
		free(cb_data);
		return -1;
	}

	ptr = strrchr(cb_data->path, '/');
	if (ptr == NULL) {
		rpc_set_error(nfs->rpc, "Invalid path %s", path);
		free_mknod_cb_data(cb_data);
		return -1;
	}
	*ptr = 0;

	cb_data->mode = mode;
	cb_data->major = major(dev);
	cb_data->minor = minor(dev);

	/* data->path now points to the parent directory,  and beyond the nul terminateor is the new directory to create */
	if (nfs_lookuppath_async(nfs, cb_data->path, 0, cb, private_data, nfs_mknod_continue_internal, cb_data, free_mknod_cb_data, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}

/*
 * Async opendir()
 */

/* ReadDirPlus Emulation Callback data */
struct rdpe_cb_data {
	int getattrcount;
	int status;
	struct nfs_cb_data *data;
};

/* ReadDirPlus Emulation LOOKUP Callback data */
struct rdpe_lookup_cb_data {
	struct rdpe_cb_data *rdpe_cb_data;
	struct nfsdirent *nfsdirent;
};

/* Workaround for servers lacking READDIRPLUS, use READDIR instead and a GETATTR-loop */
static void nfs_opendir3_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	LOOKUP3res *res = command_data;
	struct rdpe_lookup_cb_data *rdpe_lookup_cb_data = private_data;
	struct rdpe_cb_data *rdpe_cb_data = rdpe_lookup_cb_data->rdpe_cb_data;
	struct nfs_cb_data *data = rdpe_cb_data->data;
	struct nfsdir *nfsdir = data->continue_data;
	struct nfs_context *nfs = data->nfs;
	struct nfsdirent *nfsdirent = rdpe_lookup_cb_data->nfsdirent;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	free(rdpe_lookup_cb_data);

	rdpe_cb_data->getattrcount--;

	if (status == RPC_STATUS_ERROR) {
		rpc_set_error(nfs->rpc, "LOOKUP during READDIRPLUS emulation "
			      "failed with RPC_STATUS_ERROR");
		rdpe_cb_data->status = RPC_STATUS_ERROR;
	}
	if (status == RPC_STATUS_CANCEL) {
		rpc_set_error(nfs->rpc, "LOOKUP during READDIRPLUS emulation "
			      "failed with RPC_STATUS_CANCEL");
		rdpe_cb_data->status = RPC_STATUS_CANCEL;
	}
	if (status == RPC_STATUS_SUCCESS && res->status == NFS3_OK) {
		if (res->LOOKUP3res_u.resok.obj_attributes.attributes_follow) {
			fattr3 *attributes = &res->LOOKUP3res_u.resok.obj_attributes.post_op_attr_u.attributes;

			nfsdirent->type = attributes->type;
			nfsdirent->mode = attributes->mode;
			switch (nfsdirent->type) {
			case NF3REG:  nfsdirent->mode |= S_IFREG; break;
			case NF3DIR:  nfsdirent->mode |= S_IFDIR; break;
			case NF3BLK:  nfsdirent->mode |= S_IFBLK; break;
			case NF3CHR:  nfsdirent->mode |= S_IFCHR; break;
			case NF3LNK:  nfsdirent->mode |= S_IFLNK; break;
			case NF3SOCK: nfsdirent->mode |= S_IFSOCK; break;
			case NF3FIFO: nfsdirent->mode |= S_IFIFO; break;
			};
			nfsdirent->size = attributes->size;

			nfsdirent->atime.tv_sec  = attributes->atime.seconds;
			nfsdirent->atime.tv_usec = attributes->atime.nseconds/1000;
			nfsdirent->atime_nsec = attributes->atime.nseconds;
			nfsdirent->mtime.tv_sec  = attributes->mtime.seconds;
			nfsdirent->mtime.tv_usec = attributes->mtime.nseconds/1000;
			nfsdirent->mtime_nsec = attributes->mtime.nseconds;
			nfsdirent->ctime.tv_sec  = attributes->ctime.seconds;
			nfsdirent->ctime.tv_usec = attributes->ctime.nseconds/1000;
			nfsdirent->ctime_nsec = attributes->ctime.nseconds;
			nfsdirent->uid = attributes->uid;
			nfsdirent->gid = attributes->gid;
			nfsdirent->nlink = attributes->nlink;
			nfsdirent->dev = attributes->fsid;
			nfsdirent->rdev = specdata3_to_rdev(&attributes->rdev);
			nfsdirent->blksize = NFS_BLKSIZE;
			nfsdirent->blocks = (attributes->used + 512 - 1) / 512;
			nfsdirent->used = attributes->used;
		}
	}

	if (rdpe_cb_data->getattrcount == 0) {
		if (rdpe_cb_data->status != RPC_STATUS_SUCCESS) {
			rpc_set_error(nfs->rpc, "READDIRPLUS emulation "
			      "failed: %s", rpc_get_error(rpc));
			data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc),
				data->private_data);
			nfs_free_nfsdir(nfsdir);
		} else {
			data->cb(0, nfs, nfsdir, data->private_data);
		}
		free(rdpe_cb_data);
		data->continue_data = NULL;
		free_nfs_cb_data(data);
	}
}

static int lookup_missing_attributes(struct nfs_context *nfs,
				     struct nfsdir *nfsdir,
				     struct nfs_cb_data *data)
{
	struct rdpe_cb_data *rdpe_cb_data = NULL;
	struct nfsdirent *nfsdirent;

	for (nfsdirent = nfsdir->entries;
	     nfsdirent;
	     nfsdirent = nfsdirent->next) {
		struct rdpe_lookup_cb_data *rdpe_lookup_cb_data;
		LOOKUP3args args;

		/* If type == 0 we assume it is a case of the server not
		 * giving us the attributes for this entry during READIR[PLUS]
		 * so we fallback to LOOKUP3
		 */
		if (nfsdirent->type != 0) {
			continue;
		}

		if (rdpe_cb_data == NULL) {
			rdpe_cb_data = malloc(sizeof(struct rdpe_cb_data));
			rdpe_cb_data->getattrcount = 0;
			rdpe_cb_data->status = RPC_STATUS_SUCCESS;
			rdpe_cb_data->data = data;
		}
		rdpe_lookup_cb_data = malloc(sizeof(struct rdpe_lookup_cb_data));
		rdpe_lookup_cb_data->rdpe_cb_data = rdpe_cb_data;
		rdpe_lookup_cb_data->nfsdirent = nfsdirent;

		memset(&args, 0, sizeof(LOOKUP3args));
		args.what.dir = data->fh;
		args.what.name = nfsdirent->name;

		if (rpc_nfs3_lookup_async(nfs->rpc, nfs_opendir3_cb, &args,
					  rdpe_lookup_cb_data) != 0) {
			rpc_set_error(nfs->rpc, "RPC error: Failed to send "
				      "READDIR LOOKUP call");

			/* if we have already commands in flight, we cant just
			 * stop, we have to wait for the commands in flight to
			 * complete
			 */
			continue;
		}
		rdpe_cb_data->getattrcount++;
	}
	if (rdpe_cb_data != NULL) {
		return rdpe_cb_data->getattrcount;
	}
	return 0;
}

static void nfs_opendir2_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	READDIR3res *res = command_data;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct nfsdir *nfsdir = data->continue_data;
	struct nfsdirent *nfsdirent;
	struct entry3 *entry;
	uint64_t cookie = 0;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		nfs_free_nfsdir(nfsdir);
		data->continue_data = NULL;
		free_nfs_cb_data(data);
		return;
	}

	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		nfs_free_nfsdir(nfsdir);
		data->continue_data = NULL;
		free_nfs_cb_data(data);
		return;
	}

	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: READDIR of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		nfs_free_nfsdir(nfsdir);
		data->continue_data = NULL;
		free_nfs_cb_data(data);
		return;
	}

	entry =res->READDIR3res_u.resok.reply.entries;
	while (entry != NULL) {
		nfsdirent = malloc(sizeof(struct nfsdirent));
		if (nfsdirent == NULL) {
			data->cb(-ENOMEM, nfs, "Failed to allocate dirent", data->private_data);
			nfs_free_nfsdir(nfsdir);
			data->continue_data = NULL;
			free_nfs_cb_data(data);
			return;
		}
		memset(nfsdirent, 0, sizeof(struct nfsdirent));
		nfsdirent->name = strdup(entry->name);
		if (nfsdirent->name == NULL) {
			data->cb(-ENOMEM, nfs, "Failed to allocate dirent->name", data->private_data);
			free(nfsdirent);
			nfs_free_nfsdir(nfsdir);
			data->continue_data = NULL;
			free_nfs_cb_data(data);
			return;
		}
		nfsdirent->inode = entry->fileid;

		nfsdirent->next  = nfsdir->entries;
		nfsdir->entries  = nfsdirent;

		cookie = entry->cookie;
		entry  = entry->nextentry;
	}

	if (res->READDIR3res_u.resok.reply.eof == 0) {
		READDIR3args args;

		args.dir = data->fh;
		args.cookie = cookie;
		memcpy(&args.cookieverf, res->READDIR3res_u.resok.cookieverf, sizeof(cookieverf3));
		args.count = 8192;

	     	if (rpc_nfs3_readdir_async(nfs->rpc, nfs_opendir2_cb, &args, data) != 0) {
			rpc_set_error(nfs->rpc, "RPC error: Failed to send READDIR call for %s", data->path);
			data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
			nfs_free_nfsdir(nfsdir);
			data->continue_data = NULL;
			free_nfs_cb_data(data);
			return;
		}
		return;
	}

	if (res->READDIR3res_u.resok.dir_attributes.attributes_follow)
		nfsdir->attr = res->READDIR3res_u.resok.dir_attributes.post_op_attr_u.attributes;

	/* steal the dirhandle */
	nfsdir->current = nfsdir->entries;

	if (lookup_missing_attributes(nfs, nfsdir, data) == 0) {
		data->cb(0, nfs, nfsdir, data->private_data);
		data->continue_data = NULL;
		free_nfs_cb_data(data);
		return;
	}
}

static void nfs_opendir_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	READDIRPLUS3res *res = command_data;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct nfsdir *nfsdir = data->continue_data;
	struct entryplus3 *entry;
	uint64_t cookie = 0;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR || (status == RPC_STATUS_SUCCESS && res->status == NFS3ERR_NOTSUPP)){
		READDIR3args args;

		args.dir = data->fh;
		args.cookie = cookie;
		memset(&args.cookieverf, 0, sizeof(cookieverf3));
		args.count = 8192;

		if (rpc_nfs3_readdir_async(nfs->rpc, nfs_opendir2_cb, &args, data) != 0) {
			rpc_set_error(nfs->rpc, "RPC error: Failed to send READDIR call for %s", data->path);
			data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
			nfs_free_nfsdir(nfsdir);
			data->continue_data = NULL;
			free_nfs_cb_data(data);
			return;
		}
		return;
	}

	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		nfs_free_nfsdir(nfsdir);
		data->continue_data = NULL;
		free_nfs_cb_data(data);
		return;
	}

	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: READDIRPLUS of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		nfs_free_nfsdir(nfsdir);
		data->continue_data = NULL;
		free_nfs_cb_data(data);
		return;
	}

	entry =res->READDIRPLUS3res_u.resok.reply.entries;
	while (entry != NULL) {
		struct nfsdirent *nfsdirent;
		fattr3 *attr = NULL;

		nfsdirent = malloc(sizeof(struct nfsdirent));
		if (nfsdirent == NULL) {
			data->cb(-ENOMEM, nfs, "Failed to allocate dirent", data->private_data);
			nfs_free_nfsdir(nfsdir);
			data->continue_data = NULL;
			free_nfs_cb_data(data);
			return;
		}
		memset(nfsdirent, 0, sizeof(struct nfsdirent));
		nfsdirent->name = strdup(entry->name);
		if (nfsdirent->name == NULL) {
			data->cb(-ENOMEM, nfs, "Failed to allocate dirent->name", data->private_data);
			free(nfsdirent);
			nfs_free_nfsdir(nfsdir);
			data->continue_data = NULL;
			free_nfs_cb_data(data);
			return;
		}
		nfsdirent->inode = entry->fileid;

		if (entry->name_attributes.attributes_follow)
			attr = &entry->name_attributes.post_op_attr_u.attributes;

		if (attr == NULL) {
			struct nested_mounts *mnt;
			int splen = strlen(data->saved_path);

			/* A single '/' is a special case, treat it as
			 * zero-length below. */
			if (splen == 1)
				splen = 0;

			/* No name attributes. Is it a nested mount then?*/
			for(mnt = nfs->nested_mounts; mnt; mnt = mnt->next) {
				if (strncmp(data->saved_path, mnt->path, splen))
					continue;
				if (mnt->path[splen] != '/')
					continue;
				if (strcmp(mnt->path + splen + 1, entry->name))
					continue;
				attr = &mnt->attr;
				break;
			}
		}
		if (attr) {
			nfsdirent->type = attr->type;
			nfsdirent->mode = attr->mode;
			switch (nfsdirent->type) {
			case NF3REG:  nfsdirent->mode |= S_IFREG; break;
			case NF3DIR:  nfsdirent->mode |= S_IFDIR; break;
			case NF3BLK:  nfsdirent->mode |= S_IFBLK; break;
			case NF3CHR:  nfsdirent->mode |= S_IFCHR; break;
			case NF3LNK:  nfsdirent->mode |= S_IFLNK; break;
			case NF3SOCK: nfsdirent->mode |= S_IFSOCK; break;
			case NF3FIFO: nfsdirent->mode |= S_IFIFO; break;
			};
			nfsdirent->size = attr->size;

			nfsdirent->atime.tv_sec  = attr->atime.seconds;
			nfsdirent->atime.tv_usec = attr->atime.nseconds/1000;
			nfsdirent->atime_nsec = attr->atime.nseconds;
			nfsdirent->mtime.tv_sec  = attr->mtime.seconds;
			nfsdirent->mtime.tv_usec = attr->mtime.nseconds/1000;
			nfsdirent->mtime_nsec = attr->mtime.nseconds;
			nfsdirent->ctime.tv_sec  = attr->ctime.seconds;
			nfsdirent->ctime.tv_usec = attr->ctime.nseconds/1000;
			nfsdirent->ctime_nsec = attr->ctime.nseconds;
			nfsdirent->uid = attr->uid;
			nfsdirent->gid = attr->gid;
			nfsdirent->nlink = attr->nlink;
			nfsdirent->dev = attr->fsid;
			nfsdirent->rdev = specdata3_to_rdev(&attr->rdev);
			nfsdirent->blksize = NFS_BLKSIZE;
			nfsdirent->blocks = (attr->used + 512 - 1) / 512;
			nfsdirent->used = attr->used;
		}

		nfsdirent->next  = nfsdir->entries;
		nfsdir->entries  = nfsdirent;

		cookie = entry->cookie;
		entry  = entry->nextentry;
	}

	if (res->READDIRPLUS3res_u.resok.reply.eof == 0) {
		READDIRPLUS3args args;

		args.dir = data->fh;
		args.cookie = cookie;
		memcpy(&args.cookieverf, res->READDIRPLUS3res_u.resok.cookieverf, sizeof(cookieverf3));
		args.dircount = 8192;
		args.maxcount = 8192;

	     	if (rpc_nfs3_readdirplus_async(nfs->rpc, nfs_opendir_cb, &args, data) != 0) {
			rpc_set_error(nfs->rpc, "RPC error: Failed to send READDIRPLUS call for %s", data->path);
			data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
			nfs_free_nfsdir(nfsdir);
			data->continue_data = NULL;
			free_nfs_cb_data(data);
			return;
		}
		return;
	}

	if (res->READDIRPLUS3res_u.resok.dir_attributes.attributes_follow)
		nfsdir->attr = res->READDIRPLUS3res_u.resok.dir_attributes.post_op_attr_u.attributes;

	/* steal the dirhandle */
	nfsdir->current = nfsdir->entries;

	if (lookup_missing_attributes(nfs, nfsdir, data) == 0) {
		data->cb(0, nfs, nfsdir, data->private_data);
		/* We can not free data->continue_data here */
		data->continue_data = NULL;
		free_nfs_cb_data(data);
		return;
	}
}

static int nfs_opendir_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	READDIRPLUS3args args;
	struct nfsdir *nfsdir = data->continue_data;;
	struct nfsdir *cached;

	cached = nfs_dircache_find(nfs, &data->fh);
	if (cached) {
		if (attr && attr->mtime.seconds == cached->attr.mtime.seconds) {
			cached->current = cached->entries;
			data->cb(0, nfs, cached, data->private_data);
			free_nfs_cb_data(data);
			return 0;
		} else {
			/* cache must be stale */
			nfs_free_nfsdir(cached);
		}
	}

	nfsdir->fh.data.data_len  = data->fh.data.data_len;
	nfsdir->fh.data.data_val = malloc(nfsdir->fh.data.data_len);
	if (nfsdir->fh.data.data_val == NULL) {
		rpc_set_error(nfs->rpc, "OOM when allocating fh for nfsdir");
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	memcpy(nfsdir->fh.data.data_val, data->fh.data.data_val, data->fh.data.data_len);

	args.dir = data->fh;
	args.cookie = 0;
	memset(&args.cookieverf, 0, sizeof(cookieverf3));
	args.dircount = 8192;
	args.maxcount = 8192;
	if (rpc_nfs3_readdirplus_async(nfs->rpc, nfs_opendir_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send READDIRPLUS call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_opendir_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data)
{
	struct nfsdir *nfsdir;

	nfsdir = malloc(sizeof(struct nfsdir));
	if (nfsdir == NULL) {
		rpc_set_error(nfs->rpc, "failed to allocate buffer for nfsdir");
		return -1;
	}
	memset(nfsdir, 0, sizeof(struct nfsdir));

	if (nfs_lookuppath_async(nfs, path, 0, cb, private_data, nfs_opendir_continue_internal, nfsdir, free, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}


struct nfsdirent *nfs_readdir(struct nfs_context *nfs _U_, struct nfsdir *nfsdir)
{
	struct nfsdirent *nfsdirent = nfsdir->current;

	if (nfsdir->current != NULL) {
		nfsdir->current = nfsdir->current->next;
	}
	return nfsdirent;
}


/*
 * closedir()
 */
void nfs_closedir(struct nfs_context *nfs, struct nfsdir *nfsdir)
{
	nfs_dircache_add(nfs, nfsdir);
}


/*
 * getcwd()
 */
void nfs_getcwd(struct nfs_context *nfs, const char **cwd)
{
	if (cwd) {
		*cwd = nfs->cwd;
	}
}


/*
 * Async lseek()
 */
struct lseek_cb_data {
       struct nfs_context *nfs;
       struct nfsfh *nfsfh;
       int64_t offset;
       nfs_cb cb;
       void *private_data;
};

static void nfs_lseek_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	GETATTR3res *res;
	struct lseek_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	uint64_t size = 0;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: GETATTR failed with %s(%d)", nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free(data);
		return;
	}

	size = res->GETATTR3res_u.resok.obj_attributes.size;

	if (data->offset < 0 &&
	    (uint64_t)(-data->offset) > size) {
		data->cb(-EINVAL, nfs, &data->nfsfh->offset, data->private_data);
	} else {
		data->nfsfh->offset = data->offset + size;
		data->cb(0, nfs, &data->nfsfh->offset, data->private_data);
	}

	free(data);
}

int nfs_lseek_async(struct nfs_context *nfs, struct nfsfh *nfsfh, int64_t offset, int whence, nfs_cb cb, void *private_data)
{
	struct lseek_cb_data *data;
	struct GETATTR3args args;

	if (whence == SEEK_SET) {
		if (offset < 0) {
			cb(-EINVAL, nfs, &nfsfh->offset, private_data);
		} else {
			nfsfh->offset = offset;
			cb(0, nfs, &nfsfh->offset, private_data);
		}
		return 0;
	}
	if (whence == SEEK_CUR) {
		if (offset < 0 &&
		    nfsfh->offset < (uint64_t)(-offset)) {
			cb(-EINVAL, nfs, &nfsfh->offset, private_data);
		} else {
			nfsfh->offset += offset;
			cb(0, nfs, &nfsfh->offset, private_data);
		}
		return 0;
	}

	data = malloc(sizeof(struct lseek_cb_data));
	if (data == NULL) {
		rpc_set_error(nfs->rpc, "Out Of Memory: Failed to malloc lseek cb data");
		return -1;
	}

	data->nfs          = nfs;
	data->nfsfh        = nfsfh;
	data->offset       = offset;
	data->cb           = cb;
	data->private_data = private_data;

	memset(&args, 0, sizeof(GETATTR3args));
	args.object = nfsfh->fh;

	if (rpc_nfs3_getattr_async(nfs->rpc, nfs_lseek_1_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send LSEEK GETATTR call");
		free(data);
		return -1;
	}
	return 0;
}




/*
 * Async statvfs()
 */
static void nfs_statvfs_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	FSSTAT3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct statvfs svfs;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: FSSTAT of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	svfs.f_bsize   = NFS_BLKSIZE;
	svfs.f_frsize  = NFS_BLKSIZE;
	svfs.f_blocks  = res->FSSTAT3res_u.resok.tbytes/NFS_BLKSIZE;
	svfs.f_bfree   = res->FSSTAT3res_u.resok.fbytes/NFS_BLKSIZE;
	svfs.f_bavail  = res->FSSTAT3res_u.resok.abytes/NFS_BLKSIZE;
	svfs.f_files   = res->FSSTAT3res_u.resok.tfiles;
	svfs.f_ffree   = res->FSSTAT3res_u.resok.ffiles;
#if !defined(__ANDROID__)
	svfs.f_favail  = res->FSSTAT3res_u.resok.afiles;
	svfs.f_fsid    = 0;
	svfs.f_flag    = 0;
	svfs.f_namemax = 256;
#endif

	data->cb(0, nfs, &svfs, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_statvfs_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	FSSTAT3args args;

	args.fsroot = data->fh;
	if (rpc_nfs3_fsstat_async(nfs->rpc, nfs_statvfs_1_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send FSSTAT call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_statvfs_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data)
{
	if (nfs_lookuppath_async(nfs, path, 0, cb, private_data, nfs_statvfs_continue_internal, NULL, NULL, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}




/*
 * Async readlink()
 */
static void nfs_readlink_1_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	READLINK3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: READLINK of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}


	data->cb(0, nfs, res->READLINK3res_u.resok.data, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_readlink_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	READLINK3args args;

	args.symlink = data->fh;

	if (rpc_nfs3_readlink_async(nfs->rpc, nfs_readlink_1_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send READLINK call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_readlink_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data)
{
	if (nfs_lookuppath_async(nfs, path, 1, cb, private_data, nfs_readlink_continue_internal, NULL, NULL, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}




/*
 * Async chmod()
 */
static void nfs_chmod_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	SETATTR3res *res;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: SETATTR failed with %s(%d)", nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_chmod_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	SETATTR3args args;

	memset(&args, 0, sizeof(SETATTR3args));
	args.object = data->fh;
	args.new_attributes.mode.set_it = 1;
	args.new_attributes.mode.set_mode3_u.mode = data->continue_int;

	if (rpc_nfs3_setattr_async(nfs->rpc, nfs_chmod_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send SETATTR call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}


int nfs_chmod_async_internal(struct nfs_context *nfs, const char *path, int no_follow, int mode, nfs_cb cb, void *private_data)
{
	if (nfs_lookuppath_async(nfs, path, no_follow, cb, private_data, nfs_chmod_continue_internal, NULL, NULL, mode) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}

int nfs_chmod_async(struct nfs_context *nfs, const char *path, int mode, nfs_cb cb, void *private_data)
{
	return nfs_chmod_async_internal(nfs, path, 0, mode, cb, private_data);
}

int nfs_lchmod_async(struct nfs_context *nfs, const char *path, int mode, nfs_cb cb, void *private_data)
{
	return nfs_chmod_async_internal(nfs, path, 1, mode, cb, private_data);
}

/*
 * Async fchmod()
 */
int nfs_fchmod_async(struct nfs_context *nfs, struct nfsfh *nfsfh, int mode, nfs_cb cb, void *private_data)
{
	struct nfs_cb_data *data;

	data = malloc(sizeof(struct nfs_cb_data));
	if (data == NULL) {
		rpc_set_error(nfs->rpc, "out of memory. failed to allocate memory for nfs mount data");
		return -1;
	}
	memset(data, 0, sizeof(struct nfs_cb_data));
	data->nfs          = nfs;
	data->cb           = cb;
	data->private_data = private_data;
	data->continue_int = mode;
	data->fh.data.data_len = nfsfh->fh.data.data_len;
	data->fh.data.data_val = malloc(data->fh.data.data_len);
	if (data->fh.data.data_val == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory: Failed to allocate fh");
		free_nfs_cb_data(data);
		return -1;
	}
	memcpy(data->fh.data.data_val, nfsfh->fh.data.data_val, data->fh.data.data_len);

	if (nfs_chmod_continue_internal(nfs, NULL, data) != 0) {
		return -1;
	}

	return 0;
}



/*
 * Async chown()
 */
static void nfs_chown_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	SETATTR3res *res;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: SETATTR failed with %s(%d)", nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

struct nfs_chown_data {
       uid_t uid;
       gid_t gid;
};

static int nfs_chown_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	SETATTR3args args;
	struct nfs_chown_data *chown_data = data->continue_data;

	memset(&args, 0, sizeof(SETATTR3args));
	args.object = data->fh;
	if (chown_data->uid != (uid_t)-1) {
		args.new_attributes.uid.set_it = 1;
		args.new_attributes.uid.set_uid3_u.uid = chown_data->uid;
	}
	if (chown_data->gid != (gid_t)-1) {
		args.new_attributes.gid.set_it = 1;
		args.new_attributes.gid.set_gid3_u.gid = chown_data->gid;
	}

	if (rpc_nfs3_setattr_async(nfs->rpc, nfs_chown_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send SETATTR call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}


int nfs_chown_async_internal(struct nfs_context *nfs, const char *path, int no_follow, int uid, int gid, nfs_cb cb, void *private_data)
{
	struct nfs_chown_data *chown_data;

	chown_data = malloc(sizeof(struct nfs_chown_data));
	if (chown_data == NULL) {
		rpc_set_error(nfs->rpc, "Failed to allocate memory for chown data structure");
		return -1;
	}

	chown_data->uid = uid;
	chown_data->gid = gid;

	if (nfs_lookuppath_async(nfs, path, no_follow, cb, private_data, nfs_chown_continue_internal, chown_data, free, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}

int nfs_chown_async(struct nfs_context *nfs, const char *path, int uid, int gid, nfs_cb cb, void *private_data)
{
	return nfs_chown_async_internal(nfs, path, 0, uid, gid, cb, private_data);
}

int nfs_lchown_async(struct nfs_context *nfs, const char *path, int uid, int gid, nfs_cb cb, void *private_data)
{
	return nfs_chown_async_internal(nfs, path, 1, uid, gid, cb, private_data);
}

/*
 * Async fchown()
 */
int nfs_fchown_async(struct nfs_context *nfs, struct nfsfh *nfsfh, int uid, int gid, nfs_cb cb, void *private_data)
{
	struct nfs_cb_data *data;
	struct nfs_chown_data *chown_data;

	chown_data = malloc(sizeof(struct nfs_chown_data));
	if (chown_data == NULL) {
		rpc_set_error(nfs->rpc, "Failed to allocate memory for chown data structure");
		return -1;
	}

	chown_data->uid = uid;
	chown_data->gid = gid;

	data = malloc(sizeof(struct nfs_cb_data));
	if (data == NULL) {
		rpc_set_error(nfs->rpc, "out of memory. failed to allocate memory for fchown data");
		free(chown_data);
		return -1;
	}
	memset(data, 0, sizeof(struct nfs_cb_data));
	data->nfs           = nfs;
	data->cb            = cb;
	data->private_data  = private_data;
	data->continue_data = chown_data;
	data->free_continue_data = free;
	data->fh.data.data_len = nfsfh->fh.data.data_len;
	data->fh.data.data_val = malloc(data->fh.data.data_len);
	if (data->fh.data.data_val == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory: Failed to allocate fh");
		free_nfs_cb_data(data);
		return -1;
	}
	memcpy(data->fh.data.data_val, nfsfh->fh.data.data_val, data->fh.data.data_len);

	if (nfs_chown_continue_internal(nfs, NULL, data) != 0) {
		return -1;
	}

	return 0;
}





/*
 * Async utimes()
 */
static void nfs_utimes_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	SETATTR3res *res;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: SETATTR failed with %s(%d)", nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_utimes_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	SETATTR3args args;
	struct timeval *utimes_data = data->continue_data;

	memset(&args, 0, sizeof(SETATTR3args));
	args.object = data->fh;
	if (utimes_data != NULL) {
		args.new_attributes.atime.set_it = SET_TO_CLIENT_TIME;
		args.new_attributes.atime.set_atime_u.atime.seconds  = utimes_data[0].tv_sec;
		args.new_attributes.atime.set_atime_u.atime.nseconds = utimes_data[0].tv_usec * 1000;
		args.new_attributes.mtime.set_it = SET_TO_CLIENT_TIME;
		args.new_attributes.mtime.set_mtime_u.mtime.seconds  = utimes_data[1].tv_sec;
		args.new_attributes.mtime.set_mtime_u.mtime.nseconds = utimes_data[1].tv_usec * 1000;
	} else {
		args.new_attributes.atime.set_it = SET_TO_SERVER_TIME;
		args.new_attributes.mtime.set_it = SET_TO_SERVER_TIME;
	}

	if (rpc_nfs3_setattr_async(nfs->rpc, nfs_utimes_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send SETATTR call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_utimes_async_internal(struct nfs_context *nfs, const char *path, int no_follow, struct timeval *times, nfs_cb cb, void *private_data)
{
	struct timeval *new_times = NULL;

	if (times != NULL) {
		new_times = malloc(sizeof(struct timeval)*2);
		if (new_times == NULL) {
			rpc_set_error(nfs->rpc, "Failed to allocate memory for timeval structure");
			return -1;
		}

		memcpy(new_times, times, sizeof(struct timeval)*2);
	}

	if (nfs_lookuppath_async(nfs, path, no_follow, cb, private_data, nfs_utimes_continue_internal, new_times, free, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}

int nfs_utimes_async(struct nfs_context *nfs, const char *path, struct timeval *times, nfs_cb cb, void *private_data)
{
	return nfs_utimes_async_internal(nfs, path, 0, times, cb, private_data);
}

int nfs_lutimes_async(struct nfs_context *nfs, const char *path, struct timeval *times, nfs_cb cb, void *private_data)
{
	return nfs_utimes_async_internal(nfs, path, 1, times, cb, private_data);
}

/*
 * Async utime()
 */
int nfs_utime_async(struct nfs_context *nfs, const char *path, struct utimbuf *times, nfs_cb cb, void *private_data)
{
	struct timeval *new_times = NULL;

	if (times != NULL) {
		new_times = malloc(sizeof(struct timeval)*2);
		if (new_times == NULL) {
			rpc_set_error(nfs->rpc, "Failed to allocate memory for timeval structure");
			return -1;
		}

		new_times[0].tv_sec  = times->actime;
		new_times[0].tv_usec = 0;
		new_times[1].tv_sec  = times->modtime;
		new_times[1].tv_usec = 0;
	}

	if (nfs_lookuppath_async(nfs, path, 0, cb, private_data, nfs_utimes_continue_internal, new_times, free, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}


/*
 * Async access()
 */
static void nfs_access_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	ACCESS3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	unsigned int mode = 0;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: ACCESS of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	if ((data->continue_int & R_OK) && (res->ACCESS3res_u.resok.access & ACCESS3_READ)) {
		mode |= R_OK;
	}
	if ((data->continue_int & W_OK) && (res->ACCESS3res_u.resok.access & (ACCESS3_MODIFY | ACCESS3_EXTEND | ACCESS3_DELETE))) {
		mode |= W_OK;
	}
	if ((data->continue_int & X_OK) && (res->ACCESS3res_u.resok.access & (ACCESS3_LOOKUP | ACCESS3_EXECUTE))) {
		mode |= X_OK;
	}

	if (data->continue_int != mode) {
		rpc_set_error(nfs->rpc, "NFS: ACCESS denied. Required access %c%c%c. Allowed access %c%c%c",
					data->continue_int&R_OK?'r':'-',
					data->continue_int&W_OK?'w':'-',
					data->continue_int&X_OK?'x':'-',
					mode&R_OK?'r':'-',
					mode&W_OK?'w':'-',
					mode&X_OK?'x':'-');
		data->cb(-EACCES, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_access_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	int nfsmode = 0;
	ACCESS3args args;

	if (data->continue_int & R_OK) {
		nfsmode |= ACCESS3_READ;
	}
	if (data->continue_int & W_OK) {
		nfsmode |= ACCESS3_MODIFY | ACCESS3_EXTEND | ACCESS3_DELETE;
	}
	if (data->continue_int & X_OK) {
		nfsmode |= ACCESS3_LOOKUP | ACCESS3_EXECUTE;
	}

	memset(&args, 0, sizeof(ACCESS3args));
	args.object = data->fh;
	args.access = nfsmode;

	if (rpc_nfs3_access_async(nfs->rpc, nfs_access_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send OPEN ACCESS call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_access_async(struct nfs_context *nfs, const char *path, int mode, nfs_cb cb, void *private_data)
{
	if (nfs_lookuppath_async(nfs, path, 0, cb, private_data, nfs_access_continue_internal, NULL, NULL, mode & (R_OK | W_OK | X_OK)) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}



/*
 * Async access2()
 */
static void nfs_access2_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	ACCESS3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	unsigned int result = 0;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: ACCESS of %s failed with %s(%d)", data->saved_path, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	if (res->ACCESS3res_u.resok.access & ACCESS3_READ) {
		result |= R_OK;
	}
	if (res->ACCESS3res_u.resok.access & (ACCESS3_MODIFY | ACCESS3_EXTEND | ACCESS3_DELETE)) {
		result |= W_OK;
	}
	if (res->ACCESS3res_u.resok.access & (ACCESS3_LOOKUP | ACCESS3_EXECUTE)) {
		result |= X_OK;
	}

	data->cb(result, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_access2_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	ACCESS3args args;

	memset(&args, 0, sizeof(ACCESS3args));
	args.object = data->fh;
	args.access = ACCESS3_READ | ACCESS3_LOOKUP | ACCESS3_MODIFY | ACCESS3_EXTEND | ACCESS3_DELETE | ACCESS3_EXECUTE;

	if (rpc_nfs3_access_async(nfs->rpc, nfs_access2_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send OPEN ACCESS call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_access2_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data)
{
	if (nfs_lookuppath_async(nfs, path, 0, cb, private_data, nfs_access2_continue_internal, NULL, NULL, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}



/*
 * Async symlink()
 */
struct nfs_symlink_data {
       char *oldpath;
       char *newpathparent;
       char *newpathobject;
};

static void free_nfs_symlink_data(void *mem)
{
	struct nfs_symlink_data *data = mem;

	if (data->oldpath != NULL) {
		free(data->oldpath);
	}
	if (data->newpathparent != NULL) {
		free(data->newpathparent);
	}
	if (data->newpathobject != NULL) {
		free(data->newpathobject);
	}
	free(data);
}

static void nfs_symlink_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	SYMLINK3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct nfs_symlink_data *symlink_data = data->continue_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: SYMLINK %s/%s -> %s failed with %s(%d)", symlink_data->newpathparent, symlink_data->newpathobject, symlink_data->oldpath, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_symlink_continue_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	struct nfs_symlink_data *symlink_data = data->continue_data;
	SYMLINK3args args;

	memset(&args, 0, sizeof(SYMLINK3args));
	args.where.dir = data->fh;
	args.where.name = symlink_data->newpathobject;
	args.symlink.symlink_attributes.mode.set_it = 1;
	args.symlink.symlink_attributes.mode.set_mode3_u.mode = S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH;
	args.symlink.symlink_data = symlink_data->oldpath;

	if (rpc_nfs3_symlink_async(nfs->rpc, nfs_symlink_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send SYMLINK call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}

int nfs_symlink_async(struct nfs_context *nfs, const char *oldpath, const char *newpath, nfs_cb cb, void *private_data)
{
	char *ptr;
	struct nfs_symlink_data *symlink_data;

	symlink_data = malloc(sizeof(struct nfs_symlink_data));
	if (symlink_data == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate buffer for symlink data");
		return -1;
	}
	memset(symlink_data, 0, sizeof(struct nfs_symlink_data));

	symlink_data->oldpath = strdup(oldpath);
	if (symlink_data->oldpath == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate buffer for oldpath");
		free_nfs_symlink_data(symlink_data);
		return -1;
	}

	symlink_data->newpathparent = strdup(newpath);
	if (symlink_data->newpathparent == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate mode buffer for new path");
		free_nfs_symlink_data(symlink_data);
		return -1;
	}

	ptr = strrchr(symlink_data->newpathparent, '/');
	if (ptr == NULL) {
		rpc_set_error(nfs->rpc, "Invalid path %s", oldpath);
		free_nfs_symlink_data(symlink_data);
		return -1;
	}
	*ptr = 0;
	ptr++;

	symlink_data->newpathobject = strdup(ptr);
	if (symlink_data->newpathobject == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate mode buffer for new path");
		free_nfs_symlink_data(symlink_data);
		return -1;
	}

	if (nfs_lookuppath_async(nfs, symlink_data->newpathparent, 0, cb, private_data, nfs_symlink_continue_internal, symlink_data, free_nfs_symlink_data, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}



/*
 * Async rename()
 */
struct nfs_rename_data {
       char *oldpath;
       char *oldobject;
       struct nfs_fh3 olddir;
       char *newpath;
       char *newobject;
       struct nfs_fh3 newdir;
};

static void free_nfs_rename_data(void *mem)
{
	struct nfs_rename_data *data = mem;

	if (data->oldpath != NULL) {
		free(data->oldpath);
	}
	if (data->olddir.data.data_val != NULL) {
		free(data->olddir.data.data_val);
	}
	if (data->newpath != NULL) {
		free(data->newpath);
	}
	if (data->newdir.data.data_val != NULL) {
		free(data->newdir.data.data_val);
	}
	free(data);
}

static void nfs_rename_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	RENAME3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct nfs_rename_data *rename_data = data->continue_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: RENAME %s/%s -> %s/%s failed with %s(%d)", rename_data->oldpath, rename_data->oldobject, rename_data->newpath, rename_data->newobject, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_rename_continue_2_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	struct nfs_rename_data *rename_data = data->continue_data;
	RENAME3args args;

	/* steal the filehandle */
	rename_data->newdir = data->fh;
	data->fh.data.data_val = NULL;

	args.from.dir = rename_data->olddir;
	args.from.name = rename_data->oldobject;
	args.to.dir = rename_data->newdir;
	args.to.name = rename_data->newobject;
	if (rpc_nfs3_rename_async(nfs->rpc, nfs_rename_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send RENAME call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}


static int nfs_rename_continue_1_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	struct nfs_rename_data *rename_data = data->continue_data;
	char* newpath = strdup(rename_data->newpath);
	if (!newpath) {
		rpc_set_error(nfs->rpc, "Out of memory. Could not allocate memory to store target path for rename");
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}

	/* steal the filehandle */
	rename_data->olddir = data->fh;
	data->fh.data.data_val = NULL;

	if (nfs_lookuppath_async(nfs, rename_data->newpath, 0, data->cb, data->private_data, nfs_rename_continue_2_internal, rename_data, free_nfs_rename_data, 0) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send LOOKUP call for %s", newpath);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		free(newpath);
		return -1;
	}
	data->continue_data = NULL;
	free_nfs_cb_data(data);
	free(newpath);

	return 0;
}


int nfs_rename_async(struct nfs_context *nfs, const char *oldpath, const char *newpath, nfs_cb cb, void *private_data)
{
	char *ptr;
	struct nfs_rename_data *rename_data;

	rename_data = malloc(sizeof(struct nfs_rename_data));
	if (rename_data == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate buffer for rename data");
		return -1;
	}
	memset(rename_data, 0, sizeof(struct nfs_rename_data));

	rename_data->oldpath = strdup(oldpath);
	if (rename_data->oldpath == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate buffer for oldpath");
		free_nfs_rename_data(rename_data);
		return -1;
	}
	ptr = strrchr(rename_data->oldpath, '/');
	if (ptr == NULL) {
		rpc_set_error(nfs->rpc, "Invalid path %s", oldpath);
		free_nfs_rename_data(rename_data);
		return -1;
	}
	*ptr = 0;
	ptr++;
	rename_data->oldobject = ptr;


	rename_data->newpath = strdup(newpath);
	if (rename_data->newpath == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate buffer for newpath");
		free_nfs_rename_data(rename_data);
		return -1;
	}
	ptr = strrchr(rename_data->newpath, '/');
	if (ptr == NULL) {
		rpc_set_error(nfs->rpc, "Invalid path %s", newpath);
		free_nfs_rename_data(rename_data);
		return -1;
	}
	*ptr = 0;
	ptr++;
	rename_data->newobject = ptr;


	if (nfs_lookuppath_async(nfs, rename_data->oldpath, 0, cb, private_data, nfs_rename_continue_1_internal, rename_data, free_nfs_rename_data, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}


/*
 * Async link()
 */
struct nfs_link_data {
       char *oldpath;
       struct nfs_fh3 oldfh;
       char *newpath;
       char *newobject;
       struct nfs_fh3 newdir;
};

static void free_nfs_link_data(void *mem)
{
	struct nfs_link_data *data = mem;

	if (data->oldpath != NULL) {
		free(data->oldpath);
	}
	if (data->oldfh.data.data_val != NULL) {
		free(data->oldfh.data.data_val);
	}
	if (data->newpath != NULL) {
		free(data->newpath);
	}
	if (data->newdir.data.data_val != NULL) {
		free(data->newdir.data.data_val);
	}
	free(data);
}

static void nfs_link_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	LINK3res *res;
	struct nfs_cb_data *data = private_data;
	struct nfs_context *nfs = data->nfs;
	struct nfs_link_data *link_data = data->continue_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(-EFAULT, nfs, command_data, data->private_data);
		free_nfs_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(-EINTR, nfs, "Command was cancelled", data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	res = command_data;
	if (res->status != NFS3_OK) {
		rpc_set_error(nfs->rpc, "NFS: LINK %s -> %s/%s failed with %s(%d)", link_data->oldpath, link_data->newpath, link_data->newobject, nfsstat3_to_str(res->status), nfsstat3_to_errno(res->status));
		data->cb(nfsstat3_to_errno(res->status), nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return;
	}

	data->cb(0, nfs, NULL, data->private_data);
	free_nfs_cb_data(data);
}

static int nfs_link_continue_2_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	struct nfs_link_data *link_data = data->continue_data;
	LINK3args args;

	/* steal the filehandle */
	link_data->newdir = data->fh;
	data->fh.data.data_val = NULL;

	memset(&args, 0, sizeof(LINK3args));
	args.file = link_data->oldfh;
	args.link.dir = link_data->newdir;
	args.link.name = link_data->newobject;
	if (rpc_nfs3_link_async(nfs->rpc, nfs_link_cb, &args, data) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send LINK call for %s", data->path);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	return 0;
}


static int nfs_link_continue_1_internal(struct nfs_context *nfs, fattr3 *attr _U_, struct nfs_cb_data *data)
{
	struct nfs_link_data *link_data = data->continue_data;

	/* steal the filehandle */
	link_data->oldfh = data->fh;
	data->fh.data.data_val = NULL;

	if (nfs_lookuppath_async(nfs, link_data->newpath, 0, data->cb, data->private_data, nfs_link_continue_2_internal, link_data, free_nfs_link_data, 0) != 0) {
		rpc_set_error(nfs->rpc, "RPC error: Failed to send LOOKUP call for %s", link_data->newpath);
		data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
		free_nfs_cb_data(data);
		return -1;
	}
	data->continue_data = NULL;
	free_nfs_cb_data(data);

	return 0;
}


int nfs_link_async(struct nfs_context *nfs, const char *oldpath, const char *newpath, nfs_cb cb, void *private_data)
{
	char *ptr;
	struct nfs_link_data *link_data;

	link_data = malloc(sizeof(struct nfs_link_data));
	if (link_data == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate buffer for link data");
		return -1;
	}
	memset(link_data, 0, sizeof(struct nfs_link_data));

	link_data->oldpath = strdup(oldpath);
	if (link_data->oldpath == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate buffer for oldpath");
		free_nfs_link_data(link_data);
		return -1;
	}

	link_data->newpath = strdup(newpath);
	if (link_data->newpath == NULL) {
		rpc_set_error(nfs->rpc, "Out of memory, failed to allocate buffer for newpath");
		free_nfs_link_data(link_data);
		return -1;
	}
	ptr = strrchr(link_data->newpath, '/');
	if (ptr == NULL) {
		rpc_set_error(nfs->rpc, "Invalid path %s", newpath);
		free_nfs_link_data(link_data);
		return -1;
	}
	*ptr = 0;
	ptr++;
	link_data->newobject = ptr;


	if (nfs_lookuppath_async(nfs, link_data->oldpath, 0, cb, private_data, nfs_link_continue_1_internal, link_data, free_nfs_link_data, 0) != 0) {
		rpc_set_error(nfs->rpc, "Out of memory: failed to start parsing the path components");
		return -1;
	}

	return 0;
}



/*
 * Get the maximum supported READ3 size by the server
 */
uint64_t nfs_get_readmax(struct nfs_context *nfs)
{
	return nfs->readmax;
}

/*
 * Get the maximum supported WRITE3 size by the server
 */
uint64_t nfs_get_writemax(struct nfs_context *nfs)
{
	return nfs->writemax;
}

void nfs_set_tcp_syncnt(struct nfs_context *nfs, int v) {
	rpc_set_tcp_syncnt(nfs->rpc, v);
}

void nfs_set_uid(struct nfs_context *nfs, int uid) {
	rpc_set_uid(nfs->rpc, uid);
}

void nfs_set_gid(struct nfs_context *nfs, int gid) {
	rpc_set_gid(nfs->rpc, gid);
}

void nfs_set_readahead(struct nfs_context *nfs, uint32_t v) {
	rpc_set_readahead(nfs->rpc, v);
}

void nfs_set_debug(struct nfs_context *nfs, int level) {
	rpc_set_debug(nfs->rpc, level);
}

void nfs_set_error(struct nfs_context *nfs, char *error_string, ...)
{
        va_list ap;
	char *str = NULL;

        va_start(ap, error_string);
	str = malloc(1024);
	vsnprintf(str, 1024, error_string, ap);
	if (nfs->rpc->error_string != NULL) {
		free(nfs->rpc->error_string);
	}
	nfs->rpc->error_string = str;
	va_end(ap);
}



struct mount_cb_data {
       rpc_cb cb;
       void *private_data;
       char *server;
};

static void free_mount_cb_data(struct mount_cb_data *data)
{
	if (data->server != NULL) {
		free(data->server);
		data->server = NULL;
	}

	free(data);
}

static void mount_export_5_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct mount_cb_data *data = private_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status == RPC_STATUS_ERROR) {
		data->cb(rpc, -EFAULT, command_data, data->private_data);
		free_mount_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(rpc, -EINTR, "Command was cancelled", data->private_data);
		free_mount_cb_data(data);
		return;
	}

	data->cb(rpc, 0, command_data, data->private_data);
	if (rpc_disconnect(rpc, "normal disconnect") != 0) {
		rpc_set_error(rpc, "Failed to disconnect\n");
	}
	free_mount_cb_data(data);
}

static void mount_export_4_cb(struct rpc_context *rpc, int status, void *command_data, void *private_data)
{
	struct mount_cb_data *data = private_data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	/* Dont want any more callbacks even if the socket is closed */
	rpc->connect_cb = NULL;

	if (status == RPC_STATUS_ERROR) {
		data->cb(rpc, -EFAULT, command_data, data->private_data);
		free_mount_cb_data(data);
		return;
	}
	if (status == RPC_STATUS_CANCEL) {
		data->cb(rpc, -EINTR, "Command was cancelled", data->private_data);
		free_mount_cb_data(data);
		return;
	}

	if (rpc_mount3_export_async(rpc, mount_export_5_cb, data) != 0) {
		data->cb(rpc, -ENOMEM, command_data, data->private_data);
		free_mount_cb_data(data);
		return;
	}
}

int mount_getexports_async(struct rpc_context *rpc, const char *server, rpc_cb cb, void *private_data)
{
	struct mount_cb_data *data;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	data = malloc(sizeof(struct mount_cb_data));
	if (data == NULL) {
		return -1;
	}
	memset(data, 0, sizeof(struct mount_cb_data));
	data->cb           = cb;
	data->private_data = private_data;
	data->server       = strdup(server);
	if (data->server == NULL) {
		free_mount_cb_data(data);
		return -1;
	}
	if (rpc_connect_program_async(rpc, data->server, MOUNT_PROGRAM, MOUNT_V3, mount_export_4_cb, data) != 0) {
		rpc_set_error(rpc, "Failed to start connection");
		free_mount_cb_data(data);
		return -1;
	}

	return 0;
}

struct rpc_context *nfs_get_rpc_context(struct nfs_context *nfs)
{
	assert(nfs->rpc->magic == RPC_CONTEXT_MAGIC);
	return nfs->rpc;
}

const char *nfs_get_server(struct nfs_context *nfs) {
	return nfs->server;
}

const char *nfs_get_export(struct nfs_context *nfs) {
	return nfs->export;
}

const struct nfs_fh3 *nfs_get_rootfh(struct nfs_context *nfs) {
      return &nfs->rootfh;
}

struct nfs_fh3 *nfs_get_fh(struct nfsfh *nfsfh) {
       return &nfsfh->fh;
}

uint16_t nfs_umask(struct nfs_context *nfs, uint16_t mask) {
	 uint16_t tmp = nfs->mask;
	 nfs->mask = mask;
	 return tmp;
}