renamed xlator/protocol to xlator/protocol/legacy

Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Raghavendra G <raghavendra@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 875 (Implement a new protocol to provide proper backward/forward compatibility)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=875

1 files changed, 6737 insertions, 0 deletions

diff --git a/xlators/protocol/legacy/client/src/client-protocol.c b/xlators/protocol/legacy/client/src/client-protocol.c
new file mode 100644
index 00000000000..50030f8cf78
--- /dev/null
+++ b/xlators/protocol/legacy/client/src/client-protocol.c
@@ -0,0 +1,6737 @@
+/*
+  Copyright (c) 2006-2009 Gluster, Inc. <http://www.gluster.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+#include <inttypes.h>
+
+
+#include "glusterfs.h"
+#include "client-protocol.h"
+#include "compat.h"
+#include "dict.h"
+#include "protocol.h"
+#include "transport.h"
+#include "xlator.h"
+#include "logging.h"
+#include "timer.h"
+#include "defaults.h"
+#include "compat.h"
+#include "compat-errno.h"
+#include "statedump.h"
+#include "client-mem-types.h"
+
+#include <sys/resource.h>
+#include <inttypes.h>
+
+/* for default_*_cbk functions */
+#include "defaults.c"
+#include "saved-frames.h"
+#include "common-utils.h"
+
+int protocol_client_cleanup (transport_t *trans);
+int protocol_client_interpret (xlator_t *this, transport_t *trans,
+                               char *hdr_p, size_t hdrlen,
+                               struct iobuf *iobuf);
+int
+protocol_client_xfer (call_frame_t *frame, xlator_t *this, transport_t *trans,
+                      int type, int op,
+                      gf_hdr_common_t *hdr, size_t hdrlen,
+                      struct iovec *vector, int count,
+                      struct iobref *iobref);
+
+int
+protocol_client_post_handshake (call_frame_t *frame, xlator_t *this);
+
+static gf_op_t gf_fops[GF_PROTO_FOP_MAXVALUE];
+static gf_op_t gf_mops[GF_MOP_MAXVALUE];
+static gf_op_t gf_cbks[GF_CBK_MAXVALUE];
+
+
+transport_t *
+client_channel (xlator_t *this, int id)
+{
+        transport_t              *trans = NULL;
+        client_conf_t            *conf = NULL;
+        int                       i = 0;
+        struct client_connection *conn = NULL;
+
+        conf = this->private;
+
+        trans = conf->transport[id];
+        conn = trans->xl_private;
+
+        if (conn->connected == 1)
+                goto ret;
+
+        for (i = 0; i < CHANNEL_MAX; i++) {
+                trans = conf->transport[i];
+                conn = trans->xl_private;
+                if (conn->connected == 1)
+                        break;
+        }
+
+ret:
+        return trans;
+}
+
+
+client_fd_ctx_t *
+this_fd_del_ctx (fd_t *file, xlator_t *this)
+{
+        int         dict_ret = -1;
+        uint64_t    ctxaddr  = 0;
+
+        GF_VALIDATE_OR_GOTO ("client", this, out);
+        GF_VALIDATE_OR_GOTO (this->name, file, out);
+
+        dict_ret = fd_ctx_del (file, this, &ctxaddr);
+
+        if (dict_ret < 0) {
+                ctxaddr = 0;
+        }
+
+out:
+        return (client_fd_ctx_t *)(unsigned long)ctxaddr;
+}
+
+
+client_fd_ctx_t *
+this_fd_get_ctx (fd_t *file, xlator_t *this)
+{
+        int         dict_ret = -1;
+        uint64_t    ctxaddr = 0;
+
+        GF_VALIDATE_OR_GOTO ("client", this, out);
+        GF_VALIDATE_OR_GOTO (this->name, file, out);
+
+        dict_ret = fd_ctx_get (file, this, &ctxaddr);
+
+        if (dict_ret < 0) {
+                ctxaddr = 0;
+        }
+
+out:
+        return (client_fd_ctx_t *)(unsigned long)ctxaddr;
+}
+
+
+static void
+this_fd_set_ctx (fd_t *file, xlator_t *this, loc_t *loc, client_fd_ctx_t *ctx)
+{
+        uint64_t oldaddr = 0;
+        int32_t  ret = -1;
+
+        GF_VALIDATE_OR_GOTO ("client", this, out);
+        GF_VALIDATE_OR_GOTO (this->name, file, out);
+
+        ret = fd_ctx_get (file, this, &oldaddr);
+        if (ret >= 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "%s (%"PRId64"): trying duplicate remote fd set. ",
+                        loc->path, loc->inode->ino);
+        }
+
+        ret = fd_ctx_set (file, this, (uint64_t)(unsigned long)ctx);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "%s (%"PRId64"): failed to set remote fd",
+                        loc->path, loc->inode->ino);
+        }
+out:
+        return;
+}
+
+
+static int
+client_local_wipe (client_local_t *local)
+{
+        if (local) {
+                loc_wipe (&local->loc);
+
+                if (local->fd)
+                        fd_unref (local->fd);
+
+                GF_FREE (local);
+        }
+
+        return 0;
+}
+
+/*
+ * lookup_frame - lookup call frame corresponding to a given callid
+ * @trans: transport object
+ * @callid: call id of the frame
+ *
+ * not for external reference
+ */
+
+static call_frame_t *
+lookup_frame (transport_t *trans, int32_t op, int8_t type, int64_t callid)
+{
+        client_connection_t *conn = NULL;
+        call_frame_t        *frame = NULL;
+
+        conn = trans->xl_private;
+
+        pthread_mutex_lock (&conn->lock);
+        {
+                frame = saved_frames_get (conn->saved_frames,
+                                          op, type, callid);
+        }
+        pthread_mutex_unlock (&conn->lock);
+
+        return frame;
+}
+
+
+static void
+call_bail (void *data)
+{
+        client_connection_t  *conn = NULL;
+        struct timeval        current;
+        transport_t          *trans = NULL;
+        struct list_head      list;
+        struct saved_frame   *saved_frame = NULL;
+        struct saved_frame   *trav = NULL;
+        struct saved_frame   *tmp = NULL;
+        call_frame_t         *frame = NULL;
+        gf_hdr_common_t       hdr = {0, };
+        char                **gf_op_list = NULL;
+        gf_op_t              *gf_ops = NULL;
+        struct tm             frame_sent_tm;
+        char                  frame_sent[32] = {0,};
+        struct timeval        timeout = {0,};
+        gf_timer_cbk_t        timer_cbk = NULL;
+
+        GF_VALIDATE_OR_GOTO ("client", data, out);
+        trans = data;
+
+        conn = trans->xl_private;
+
+        gettimeofday (&current, NULL);
+        INIT_LIST_HEAD (&list);
+
+        pthread_mutex_lock (&conn->lock);
+        {
+                /* Chaining to get call-always functionality from
+                   call-once timer */
+                if (conn->timer) {
+                        timer_cbk = conn->timer->callbk;
+
+                        timeout.tv_sec = 10;
+                        timeout.tv_usec = 0;
+
+                        gf_timer_call_cancel (trans->xl->ctx, conn->timer);
+                        conn->timer = gf_timer_call_after (trans->xl->ctx,
+                                                           timeout,
+                                                           timer_cbk,
+                                                           trans);
+                        if (conn->timer == NULL) {
+                                gf_log (trans->xl->name, GF_LOG_DEBUG,
+                                        "Cannot create bailout timer");
+                        }
+                }
+
+                do {
+                        saved_frame =
+                                saved_frames_get_timedout (conn->saved_frames,
+                                                           GF_OP_TYPE_MOP_REQUEST,
+                                                           conn->frame_timeout,
+                                                           &current);
+                        if (saved_frame)
+                                list_add (&saved_frame->list, &list);
+
+                } while (saved_frame);
+
+                do {
+                        saved_frame =
+                                saved_frames_get_timedout (conn->saved_frames,
+                                                           GF_OP_TYPE_FOP_REQUEST,
+                                                           conn->frame_timeout,
+                                                           &current);
+                        if (saved_frame)
+                                list_add (&saved_frame->list, &list);
+                } while (saved_frame);
+
+                do {
+                        saved_frame =
+                                saved_frames_get_timedout (conn->saved_frames,
+                                                           GF_OP_TYPE_CBK_REQUEST,
+                                                           conn->frame_timeout,
+                                                           &current);
+                        if (saved_frame)
+                                list_add (&saved_frame->list, &list);
+                } while (saved_frame);
+        }
+        pthread_mutex_unlock (&conn->lock);
+
+        hdr.rsp.op_ret   = hton32 (-1);
+        hdr.rsp.op_errno = hton32 (ENOTCONN);
+
+        list_for_each_entry_safe (trav, tmp, &list, list) {
+                switch (trav->type)
+                {
+                case GF_OP_TYPE_FOP_REQUEST:
+                        gf_ops = gf_fops;
+                        gf_op_list = gf_fop_list;
+                        break;
+                case GF_OP_TYPE_MOP_REQUEST:
+                        gf_ops = gf_mops;
+                        gf_op_list = gf_mop_list;
+                        break;
+                case GF_OP_TYPE_CBK_REQUEST:
+                        gf_ops = gf_cbks;
+                        gf_op_list = gf_cbk_list;
+                        break;
+                }
+
+                localtime_r (&trav->saved_at.tv_sec, &frame_sent_tm);
+                strftime (frame_sent, 32, "%Y-%m-%d %H:%M:%S", &frame_sent_tm);
+
+                gf_log (trans->xl->name, GF_LOG_ERROR,
+                        "bailing out frame %s(%d) "
+                        "frame sent = %s. frame-timeout = %d",
+                        gf_op_list[trav->op], trav->op,
+                        frame_sent, conn->frame_timeout);
+
+                hdr.type = hton32 (trav->type);
+                hdr.op   = hton32 (trav->op);
+
+                frame = trav->frame;
+
+                gf_ops[trav->op] (frame, &hdr, sizeof (hdr), NULL);
+
+                list_del_init (&trav->list);
+                GF_FREE (trav);
+        }
+out:
+        return;
+}
+
+
+void
+save_frame (transport_t *trans, call_frame_t *frame,
+            int32_t op, int8_t type, uint64_t callid)
+{
+        client_connection_t *conn = NULL;
+        struct timeval       timeout = {0, };
+
+
+        conn = trans->xl_private;
+
+        saved_frames_put (conn->saved_frames, frame, op, type, callid);
+
+        if (conn->timer == NULL && conn->frame_timeout) {
+                timeout.tv_sec  = 10;
+                timeout.tv_usec = 0;
+                conn->timer = gf_timer_call_after (trans->xl->ctx, timeout,
+                                                   call_bail, (void *) trans);
+        }
+}
+
+
+
+void
+client_ping_timer_expired (void *data)
+{
+        xlator_t            *this = NULL;
+        transport_t         *trans = NULL;
+        client_conf_t       *conf = NULL;
+        client_connection_t *conn = NULL;
+        int                  disconnect = 0;
+        int                  transport_activity = 0;
+        struct timeval       timeout = {0, };
+        struct timeval       current = {0, };
+
+        trans = data;
+        this  = trans->xl;
+        conf  = this->private;
+        conn  = trans->xl_private;
+
+        pthread_mutex_lock (&conn->lock);
+        {
+                if (conn->ping_timer)
+                        gf_timer_call_cancel (trans->xl->ctx,
+                                              conn->ping_timer);
+                gettimeofday (&current, NULL);
+
+                pthread_mutex_lock (&conf->mutex);
+                {
+                        if (((current.tv_sec - conf->last_received.tv_sec) <
+                             conn->ping_timeout)
+                            || ((current.tv_sec - conf->last_sent.tv_sec) <
+                                conn->ping_timeout)) {
+                                transport_activity = 1;
+                        }
+                }
+                pthread_mutex_unlock (&conf->mutex);
+
+                if (transport_activity) {
+                        gf_log (this->name, GF_LOG_TRACE,
+                                "ping timer expired but transport activity "
+                                "detected - not bailing transport");
+                        conn->transport_activity = 0;
+                        timeout.tv_sec = conn->ping_timeout;
+                        timeout.tv_usec = 0;
+
+                        conn->ping_timer =
+                                gf_timer_call_after (trans->xl->ctx, timeout,
+                                                     client_ping_timer_expired,
+                                                     (void *) trans);
+                        if (conn->ping_timer == NULL)
+                                gf_log (this->name, GF_LOG_DEBUG,
+                                        "unable to setup timer");
+
+                } else {
+                        conn->ping_started = 0;
+                        conn->ping_timer = NULL;
+                        disconnect = 1;
+                }
+        }
+        pthread_mutex_unlock (&conn->lock);
+        if (disconnect) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Server %s has not responded in the last %d "
+                        "seconds, disconnecting.",
+                        conf->transport[0]->peerinfo.identifier,
+                        conn->ping_timeout);
+
+                transport_disconnect (conf->transport[0]);
+                transport_disconnect (conf->transport[1]);
+        }
+}
+
+
+void
+client_start_ping (void *data)
+{
+        xlator_t            *this = NULL;
+        transport_t         *trans = NULL;
+        client_conf_t       *conf = NULL;
+        client_connection_t *conn = NULL;
+        int32_t              ret = -1;
+        gf_hdr_common_t     *hdr = NULL;
+        struct timeval       timeout = {0, };
+        call_frame_t        *dummy_frame = NULL;
+        size_t               hdrlen = -1;
+        gf_mop_ping_req_t   *req = NULL;
+        int                  frame_count = 0;
+
+
+        trans = data;
+        this  = trans->xl;
+        conf  = this->private;
+        conn  = trans->xl_private;
+
+        if (!conn->ping_timeout)
+                return;
+
+        pthread_mutex_lock (&conn->lock);
+        {
+                if (conn->ping_timer)
+                        gf_timer_call_cancel (trans->xl->ctx, conn->ping_timer);
+
+                conn->ping_timer = NULL;
+                conn->ping_started = 0;
+
+                if (conn->saved_frames)
+                        /* treat the case where conn->saved_frames is NULL
+                           as no pending frames */
+                        frame_count = conn->saved_frames->count;
+
+                if ((frame_count == 0) || !conn->connected) {
+                        /* using goto looked ugly here,
+                         * hence getting out this way */
+                        /* unlock */
+                        pthread_mutex_unlock (&conn->lock);
+                        return;
+                }
+
+                if (frame_count < 0) {
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "saved_frames->count is %"PRId64,
+                                conn->saved_frames->count);
+                        conn->saved_frames->count = 0;
+                }
+
+                timeout.tv_sec = conn->ping_timeout;
+                timeout.tv_usec = 0;
+
+                conn->ping_timer =
+                        gf_timer_call_after (trans->xl->ctx, timeout,
+                                             client_ping_timer_expired,
+                                             (void *) trans);
+
+                if (conn->ping_timer == NULL) {
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "unable to setup timer");
+                } else {
+                        conn->ping_started = 1;
+                }
+        }
+        pthread_mutex_unlock (&conn->lock);
+
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        if (!hdr)
+                goto err;
+
+        dummy_frame = create_frame (this, this->ctx->pool);
+
+        if (!dummy_frame)
+                goto err;
+
+        dummy_frame->local = trans;
+
+        ret = protocol_client_xfer (dummy_frame, this, trans,
+                                    GF_OP_TYPE_MOP_REQUEST, GF_MOP_PING,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return;
+err:
+        if (hdr)
+                GF_FREE (hdr);
+
+        if (dummy_frame)
+                STACK_DESTROY (dummy_frame->root);
+
+        return;
+}
+
+
+int
+client_ping_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                 struct iobuf *iobuf)
+{
+        xlator_t            *this = NULL;
+        transport_t         *trans = NULL;
+        client_connection_t *conn = NULL;
+        struct timeval       timeout = {0, };
+        int                  op_ret = 0;
+
+        trans  = frame->local; frame->local = NULL;
+        this   = trans->xl;
+        conn   = trans->xl_private;
+
+        op_ret = ntoh32 (hdr->rsp.op_ret);
+
+        if (op_ret == -1) {
+                /* timer expired and transport bailed out */
+                gf_log (this->name, GF_LOG_DEBUG, "timer must have expired");
+                goto out;
+        }
+
+        pthread_mutex_lock (&conn->lock);
+        {
+                timeout.tv_sec  = conn->ping_timeout;
+                timeout.tv_usec = 0;
+
+                gf_timer_call_cancel (trans->xl->ctx,
+                                      conn->ping_timer);
+
+                conn->ping_timer =
+                        gf_timer_call_after (trans->xl->ctx, timeout,
+                                             client_start_ping, (void *)trans);
+                if (conn->ping_timer == NULL)
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "gf_timer_call_after() returned NULL");
+        }
+        pthread_mutex_unlock (&conn->lock);
+out:
+        STACK_DESTROY (frame->root);
+        return 0;
+}
+
+int
+client_encode_groups (call_frame_t *frame, gf_hdr_common_t *hdr)
+{
+        int     i = 0;
+        if ((!frame) || (!hdr))
+                return -1;
+
+        hdr->req.ngrps = hton32 (frame->root->ngrps);
+        if (frame->root->ngrps == 0)
+                return 0;
+
+        for (; i < frame->root->ngrps; ++i)
+                hdr->req.groups[i] = hton32 (frame->root->groups[i]);
+
+        return 0;
+}
+
+
+int
+protocol_client_xfer (call_frame_t *frame, xlator_t *this, transport_t *trans,
+                      int type, int op,
+                      gf_hdr_common_t *hdr, size_t hdrlen,
+                      struct iovec *vector, int count,
+                      struct iobref *iobref)
+{
+        client_conf_t        *conf = NULL;
+        client_connection_t  *conn = NULL;
+        uint64_t              callid = 0;
+        int32_t               ret = -1;
+        int                   start_ping = 0;
+        gf_hdr_common_t       rsphdr = {0, };
+
+        conf  = this->private;
+
+        if (!trans) {
+                /* default to bulk op since it is 'safer' */
+                trans = conf->transport[CHANNEL_BULK];
+        }
+        conn  = trans->xl_private;
+
+        pthread_mutex_lock (&conn->lock);
+        {
+                callid = ++conn->callid;
+
+                hdr->callid = hton64 (callid);
+                hdr->op     = hton32 (op);
+                hdr->type   = hton32 (type);
+
+                if (frame) {
+                        hdr->req.uid = hton32 (frame->root->uid);
+                        hdr->req.gid = hton32 (frame->root->gid);
+                        hdr->req.pid = hton32 (frame->root->pid);
+                        hdr->req.lk_owner = hton64 (frame->root->lk_owner);
+                        client_encode_groups (frame, hdr);
+                }
+
+                if (conn->connected == 0)
+                        transport_connect (trans);
+
+                ret = -1;
+
+                if (conn->connected ||
+                    ((type == GF_OP_TYPE_MOP_REQUEST) &&
+                     (op == GF_MOP_SETVOLUME))) {
+                        ret = transport_submit (trans, (char *)hdr, hdrlen,
+                                                vector, count, iobref);
+                }
+
+                if ((ret >= 0) && frame) {
+                        pthread_mutex_lock (&conf->mutex);
+                        {
+                                gettimeofday (&conf->last_sent, NULL);
+                        }
+                        pthread_mutex_unlock (&conf->mutex);
+                        save_frame (trans, frame, op, type, callid);
+                }
+
+                if (!conn->ping_started && (ret >= 0)) {
+                        start_ping = 1;
+                }
+        }
+        pthread_mutex_unlock (&conn->lock);
+
+        if (start_ping)
+                client_start_ping ((void *) trans);
+
+        if (frame && (ret < 0)) {
+                rsphdr.op = op;
+                rsphdr.rsp.op_ret   = hton32 (-1);
+                rsphdr.rsp.op_errno = hton32 (ENOTCONN);
+
+                if (type == GF_OP_TYPE_FOP_REQUEST) {
+                        rsphdr.type = GF_OP_TYPE_FOP_REPLY;
+                        gf_fops[op] (frame, &rsphdr, sizeof (rsphdr), NULL);
+                } else if (type == GF_OP_TYPE_MOP_REQUEST) {
+                        rsphdr.type = GF_OP_TYPE_MOP_REPLY;
+                        gf_mops[op] (frame, &rsphdr, sizeof (rsphdr), NULL);
+                } else {
+                        rsphdr.type = GF_OP_TYPE_CBK_REPLY;
+                        gf_cbks[op] (frame, &rsphdr, sizeof (rsphdr), NULL);
+                }
+
+                GF_FREE (hdr);
+        }
+
+        return ret;
+}
+
+
+
+/**
+ * client_create - create function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @path: complete path to file
+ * @flags: create flags
+ * @mode: create mode
+ *
+ * external reference through client_protocol_xlator->fops->create
+ */
+
+int
+client_create (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
+               mode_t mode, fd_t *fd)
+{
+        gf_hdr_common_t     *hdr = NULL;
+        gf_fop_create_req_t *req = NULL;
+        size_t               hdrlen = 0;
+        size_t               pathlen = 0;
+        size_t               baselen = 0;
+        int32_t              ret = -1;
+        ino_t                par = 0;
+        uint64_t             gen = 0;
+        client_local_t      *local = NULL;
+
+
+        local = GF_CALLOC (1, sizeof (*local), gf_client_mt_client_local_t);
+        GF_VALIDATE_OR_GOTO (this->name, local, unwind);
+
+        local->fd = fd_ref (fd);
+        loc_copy (&local->loc, loc);
+        local->flags = flags;
+
+        frame->local = local;
+
+        pathlen = STRLEN_0 (loc->path);
+        baselen = STRLEN_0 (loc->name);
+
+        ret = inode_ctx_get2 (loc->parent, this, &par, &gen);
+        if (loc->parent->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "CREATE %"PRId64"/%s (%s): failed to get remote inode "
+                        "number for parent inode",
+                        loc->parent->ino, loc->name, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen + baselen);
+        hdr    = gf_hdr_new (req, pathlen + baselen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->flags   = hton32 (gf_flags_from_flags (flags));
+        req->mode    = hton32 (mode);
+        req->par     = hton64 (par);
+        req->gen     = hton64 (gen);
+        strcpy (req->path, loc->path);
+        strcpy (req->bname + pathlen, loc->name);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_CREATE,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, fd, NULL, NULL);
+        return 0;
+
+}
+
+/**
+ * client_open - open function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location of file
+ * @flags: open flags
+ * @mode: open modes
+ *
+ * external reference through client_protocol_xlator->fops->open
+ */
+
+int
+client_open (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
+             fd_t *fd, int32_t wbflags)
+{
+        int                 ret = -1;
+        gf_hdr_common_t    *hdr = NULL;
+        size_t              hdrlen = 0;
+        gf_fop_open_req_t  *req = NULL;
+        size_t              pathlen = 0;
+        ino_t               ino = 0;
+        uint64_t            gen = 0;
+        client_local_t     *local = NULL;
+
+        local = GF_CALLOC (1, sizeof (*local), gf_client_mt_client_local_t);
+        GF_VALIDATE_OR_GOTO (this->name, local, unwind);
+
+        local->fd = fd_ref (fd);
+        loc_copy (&local->loc, loc);
+        local->flags = flags;
+        local->wbflags = wbflags;
+
+        frame->local = local;
+
+        pathlen = STRLEN_0 (loc->path);
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "OPEN %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen);
+        hdr    = gf_hdr_new (req, pathlen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino   = hton64 (ino);
+        req->gen   = hton64 (gen);
+        req->flags = hton32 (gf_flags_from_flags (flags));
+        req->wbflags = hton32 (wbflags);
+        strcpy (req->path, loc->path);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_OPEN,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, fd);
+        return 0;
+
+}
+
+
+/**
+ * client_stat - stat function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location
+ *
+ * external reference through client_protocol_xlator->fops->stat
+ */
+
+int
+client_stat (call_frame_t *frame, xlator_t *this, loc_t *loc)
+{
+        gf_hdr_common_t   *hdr = NULL;
+        gf_fop_stat_req_t *req = NULL;
+        size_t             hdrlen = -1;
+        int32_t            ret = -1;
+        size_t             pathlen = 0;
+        ino_t              ino = 0;
+        ino_t              gen = 0;
+
+        pathlen = STRLEN_0 (loc->path);
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "STAT %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen);
+        hdr    = gf_hdr_new (req, pathlen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino  = hton64 (ino);
+        req->gen  = hton64 (gen);
+        strcpy (req->path, loc->path);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_STAT,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+
+}
+
+
+/**
+ * client_readlink - readlink function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location
+ * @size:
+ *
+ * external reference through client_protocol_xlator->fops->readlink
+ */
+int
+client_readlink (call_frame_t *frame, xlator_t *this, loc_t *loc, size_t size)
+{
+        gf_hdr_common_t       *hdr = NULL;
+        gf_fop_readlink_req_t *req = NULL;
+        size_t                 hdrlen = -1;
+        int                    ret = -1;
+        size_t                 pathlen = 0;
+        ino_t                  ino = 0;
+        uint64_t               gen = 0;
+
+        pathlen = STRLEN_0 (loc->path);
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "READLINK %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen);
+        hdr    = gf_hdr_new (req, pathlen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino  = hton64 (ino);
+        req->gen  = hton64 (gen);
+        req->size = hton32 (size);
+        strcpy (req->path, loc->path);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_READLINK,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND_STRICT (readlink, frame, -1, EINVAL,
+                             NULL, NULL);
+        return 0;
+
+}
+
+
+/**
+ * client_mknod - mknod function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @path: pathname of node
+ * @mode:
+ * @dev:
+ *
+ * external reference through client_protocol_xlator->fops->mknod
+ */
+int
+client_mknod (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode,
+              dev_t dev)
+{
+        gf_hdr_common_t    *hdr = NULL;
+        gf_fop_mknod_req_t *req = NULL;
+        size_t              hdrlen = -1;
+        int                 ret = -1;
+        size_t              pathlen = 0;
+        size_t              baselen = 0;
+        ino_t               par = 0;
+        uint64_t            gen = 0;
+        client_local_t     *local = NULL;
+
+        local = GF_CALLOC (1, sizeof (*local), gf_client_mt_client_local_t);
+        GF_VALIDATE_OR_GOTO (this->name, local, unwind);
+
+        loc_copy (&local->loc, loc);
+
+        frame->local = local;
+
+        pathlen = STRLEN_0 (loc->path);
+        baselen = STRLEN_0 (loc->name);
+        ret = inode_ctx_get2 (loc->parent, this, &par, &gen);
+        if (loc->parent->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "MKNOD %"PRId64"/%s (%s): failed to get remote inode "
+                        "number for parent",
+                        loc->parent->ino, loc->name, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen + baselen);
+        hdr    = gf_hdr_new (req, pathlen + baselen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->par  = hton64 (par);
+        req->gen  = hton64 (gen);
+        req->mode = hton32 (mode);
+        req->dev  = hton64 (dev);
+        strcpy (req->path, loc->path);
+        strcpy (req->bname + pathlen, loc->name);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_MKNOD,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, loc->inode, NULL);
+        return 0;
+
+}
+
+
+/**
+ * client_mkdir - mkdir function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @path: pathname of directory
+ * @mode:
+ *
+ * external reference through client_protocol_xlator->fops->mkdir
+ */
+int
+client_mkdir (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode)
+{
+        gf_hdr_common_t    *hdr = NULL;
+        gf_fop_mkdir_req_t *req = NULL;
+        size_t              hdrlen = -1;
+        int                 ret = -1;
+        size_t              pathlen = 0;
+        size_t              baselen = 0;
+        ino_t               par = 0;
+        uint64_t            gen = 0;
+        client_local_t     *local = NULL;
+
+        local = GF_CALLOC (1, sizeof (*local), gf_client_mt_client_local_t);
+        GF_VALIDATE_OR_GOTO (this->name, local, unwind);
+
+        loc_copy (&local->loc, loc);
+
+        frame->local = local;
+
+        pathlen = STRLEN_0 (loc->path);
+        baselen = STRLEN_0 (loc->name);
+        ret = inode_ctx_get2 (loc->parent, this, &par, &gen);
+        if (loc->parent->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "MKDIR %"PRId64"/%s (%s): failed to get remote inode "
+                        "number for parent",
+                        loc->parent->ino, loc->name, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen + baselen);
+        hdr    = gf_hdr_new (req, pathlen + baselen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->par  = hton64 (par);
+        req->gen  = hton64 (gen);
+        req->mode = hton32 (mode);
+        strcpy (req->path, loc->path);
+        strcpy (req->bname + pathlen, loc->name);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_MKDIR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, loc->inode, NULL);
+        return 0;
+
+}
+
+/**
+ * client_unlink - unlink function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location of file
+ *
+ * external reference through client_protocol_xlator->fops->unlink
+ */
+
+int
+client_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc)
+{
+        gf_hdr_common_t     *hdr = NULL;
+        gf_fop_unlink_req_t *req = NULL;
+        size_t               hdrlen = -1;
+        int                  ret = -1;
+        size_t               pathlen = 0;
+        size_t               baselen = 0;
+        ino_t                par = 0;
+        uint64_t             gen = 0;
+
+        pathlen = STRLEN_0 (loc->path);
+        baselen = STRLEN_0 (loc->name);
+        ret = inode_ctx_get2 (loc->parent, this, &par, &gen);
+        if (loc->parent->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "UNLINK %"PRId64"/%s (%s): failed to get remote inode "
+                        "number for parent",
+                        loc->parent->ino, loc->name, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen + baselen);
+        hdr    = gf_hdr_new (req, pathlen + baselen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->par  = hton64 (par);
+        req->gen  = hton64 (gen);
+        strcpy (req->path, loc->path);
+        strcpy (req->bname + pathlen, loc->name);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_UNLINK,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+
+}
+
+/**
+ * client_rmdir - rmdir function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location
+ *
+ * external reference through client_protocol_xlator->fops->rmdir
+ */
+
+int
+client_rmdir (call_frame_t *frame, xlator_t *this, loc_t *loc)
+{
+        gf_hdr_common_t    *hdr = NULL;
+        gf_fop_rmdir_req_t *req = NULL;
+        size_t              hdrlen = -1;
+        int                 ret = -1;
+        size_t              pathlen = 0;
+        size_t              baselen = 0;
+        ino_t               par = 0;
+        uint64_t            gen = 0;
+
+        pathlen = STRLEN_0 (loc->path);
+        baselen = STRLEN_0 (loc->name);
+        ret = inode_ctx_get2 (loc->parent, this, &par, &gen);
+        if (loc->parent->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "RMDIR %"PRId64"/%s (%s): failed to get remote inode "
+                        "number for parent",
+                        loc->parent->ino, loc->name, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen + baselen);
+        hdr    = gf_hdr_new (req, pathlen + baselen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->par  = hton64 (par);
+        req->gen  = hton64 (gen);
+        strcpy (req->path, loc->path);
+        strcpy (req->bname + pathlen, loc->name);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_RMDIR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+
+}
+
+
+/**
+ * client_symlink - symlink function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @oldpath: pathname of target
+ * @newpath: pathname of symlink
+ *
+ * external reference through client_protocol_xlator->fops->symlink
+ */
+
+int
+client_symlink (call_frame_t *frame, xlator_t *this, const char *linkname,
+                loc_t *loc)
+{
+        int                   ret = -1;
+        gf_hdr_common_t      *hdr = NULL;
+        gf_fop_symlink_req_t *req = NULL;
+        size_t                hdrlen  = 0;
+        size_t                pathlen = 0;
+        size_t                newlen  = 0;
+        size_t                baselen = 0;
+        ino_t                 par = 0;
+        uint64_t              gen = 0;
+        client_local_t       *local = NULL;
+
+        local = GF_CALLOC (1, sizeof (*local), gf_client_mt_client_local_t);
+        GF_VALIDATE_OR_GOTO (this->name, local, unwind);
+
+        loc_copy (&local->loc, loc);
+
+        frame->local = local;
+
+        pathlen = STRLEN_0 (loc->path);
+        baselen = STRLEN_0 (loc->name);
+        newlen = STRLEN_0 (linkname);
+        ret = inode_ctx_get2 (loc->parent, this, &par, &gen);
+        if (loc->parent->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "SYMLINK %"PRId64"/%s (%s): failed to get remote inode"
+                        " number parent",
+                        loc->parent->ino, loc->name, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen + baselen + newlen);
+        hdr    = gf_hdr_new (req, pathlen + baselen + newlen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->par =  hton64 (par);
+        req->gen =  hton64 (gen);
+        strcpy (req->path, loc->path);
+        strcpy (req->bname + pathlen, loc->name);
+        strcpy (req->linkname + pathlen + baselen, linkname);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_SYMLINK,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, loc->inode, NULL);
+        return 0;
+
+}
+
+/**
+ * client_rename - rename function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @oldloc: location of old pathname
+ * @newloc: location of new pathname
+ *
+ * external reference through client_protocol_xlator->fops->rename
+ */
+
+int
+client_rename (call_frame_t *frame, xlator_t *this, loc_t *oldloc,
+               loc_t *newloc)
+{
+        int                  ret = -1;
+        gf_hdr_common_t     *hdr = NULL;
+        gf_fop_rename_req_t *req = NULL;
+        size_t               hdrlen = 0;
+        size_t               oldpathlen = 0;
+        size_t               oldbaselen = 0;
+        size_t               newpathlen = 0;
+        size_t               newbaselen = 0;
+        ino_t                oldpar = 0;
+        uint64_t             oldgen = 0;
+        ino_t                newpar = 0;
+        uint64_t             newgen = 0;
+
+        oldpathlen = STRLEN_0 (oldloc->path);
+        oldbaselen = STRLEN_0 (oldloc->name);
+        newpathlen = STRLEN_0 (newloc->path);
+        newbaselen = STRLEN_0 (newloc->name);
+        ret = inode_ctx_get2 (oldloc->parent, this, &oldpar, &oldgen);
+        if (oldloc->parent->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "RENAME %"PRId64"/%s (%s): failed to get remote inode "
+                        "number for source parent",
+                        oldloc->parent->ino, oldloc->name, oldloc->path);
+                goto unwind;
+        }
+
+        ret = inode_ctx_get2 (newloc->parent, this, &newpar, &newgen);
+        if (newloc->parent->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "CREATE %"PRId64"/%s (%s): failed to get remote inode "
+                        "number for destination parent",
+                        newloc->parent->ino, newloc->name, newloc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, (oldpathlen + oldbaselen +
+                                   newpathlen + newbaselen));
+        hdr    = gf_hdr_new (req, (oldpathlen + oldbaselen +
+                                   newpathlen + newbaselen));
+
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->oldpar = hton64 (oldpar);
+        req->oldgen = hton64 (oldgen);
+        req->newpar = hton64 (newpar);
+        req->newgen = hton64 (newgen);
+
+        strcpy (req->oldpath, oldloc->path);
+        strcpy (req->oldbname + oldpathlen, oldloc->name);
+        strcpy (req->newpath  + oldpathlen + oldbaselen, newloc->path);
+        strcpy (req->newbname + oldpathlen + oldbaselen + newpathlen,
+                newloc->name);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_RENAME,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+
+}
+
+/**
+ * client_link - link function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @oldloc: location of old pathname
+ * @newpath: new pathname
+ *
+ * external reference through client_protocol_xlator->fops->link
+ */
+
+int
+client_link (call_frame_t *frame, xlator_t *this, loc_t *oldloc, loc_t *newloc)
+{
+        int                ret = -1;
+        gf_hdr_common_t   *hdr = NULL;
+        gf_fop_link_req_t *req = NULL;
+        size_t             hdrlen = 0;
+        size_t             oldpathlen = 0;
+        size_t             newpathlen = 0;
+        size_t             newbaselen = 0;
+        ino_t              oldino = 0;
+        uint64_t           oldgen = 0;
+        ino_t              newpar = 0;
+        uint64_t           newgen = 0;
+        client_local_t    *local = NULL;
+
+        local = GF_CALLOC (1, sizeof (*local), gf_client_mt_client_local_t);
+        GF_VALIDATE_OR_GOTO (this->name, local, unwind);
+
+        loc_copy (&local->loc, oldloc);
+
+        frame->local = local;
+
+        oldpathlen = STRLEN_0 (oldloc->path);
+        newpathlen = STRLEN_0 (newloc->path);
+        newbaselen = STRLEN_0 (newloc->name);
+
+        ret = inode_ctx_get2 (oldloc->inode, this, &oldino, &oldgen);
+        if (oldloc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "LINK %"PRId64"/%s (%s) ==> %"PRId64" (%s): "
+                        "failed to get remote inode number for source inode",
+                        newloc->parent->ino, newloc->name, newloc->path,
+                        oldloc->ino, oldloc->path);
+                goto unwind;
+        }
+
+        ret = inode_ctx_get2 (newloc->parent, this, &newpar, &newgen);
+        if (newloc->parent->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "LINK %"PRId64"/%s (%s) ==> %"PRId64" (%s): "
+                        "failed to get remote inode number destination parent",
+                        newloc->parent->ino, newloc->name, newloc->path,
+                        oldloc->ino, oldloc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, oldpathlen + newpathlen + newbaselen);
+        hdr    = gf_hdr_new (req, oldpathlen + newpathlen + newbaselen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        strcpy (req->oldpath, oldloc->path);
+        strcpy (req->newpath  + oldpathlen, newloc->path);
+        strcpy (req->newbname + oldpathlen + newpathlen, newloc->name);
+
+        req->oldino = hton64 (oldino);
+        req->oldgen = hton64 (oldgen);
+        req->newpar = hton64 (newpar);
+        req->newgen = hton64 (newgen);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_LINK,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, oldloc->inode, NULL);
+        return 0;
+}
+
+
+/**
+ * client_truncate - truncate function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location
+ * @offset:
+ *
+ * external reference through client_protocol_xlator->fops->truncate
+ */
+
+int
+client_truncate (call_frame_t *frame, xlator_t *this, loc_t *loc, off_t offset)
+{
+        gf_hdr_common_t       *hdr = NULL;
+        gf_fop_truncate_req_t *req = NULL;
+        size_t                 hdrlen = -1;
+        int                    ret = -1;
+        size_t                 pathlen = 0;
+        ino_t                  ino = 0;
+        uint64_t               gen = 0;
+
+        pathlen = STRLEN_0 (loc->path);
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "TRUNCATE %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen);
+        hdr    = gf_hdr_new (req, pathlen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino    = hton64 (ino);
+        req->gen    = hton64 (gen);
+        req->offset = hton64 (offset);
+        strcpy (req->path, loc->path);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_TRUNCATE,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+
+}
+
+
+/**
+ * client_readv - readv function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @fd: file descriptor structure
+ * @size:
+ * @offset:
+ *
+ * external reference through client_protocol_xlator->fops->readv
+ */
+
+int
+client_readv (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
+              off_t offset)
+{
+        gf_hdr_common_t    *hdr = NULL;
+        gf_fop_read_req_t  *req = NULL;
+        size_t              hdrlen = 0;
+        int64_t             remote_fd = -1;
+        int                 ret = -1;
+        client_fd_ctx_t    *fdctx = NULL;
+        client_conf_t      *conf = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx, EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, NULL, 0, NULL);
+                return 0;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx, EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, NULL, 0, NULL);
+                return 0;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->fd     = hton64 (remote_fd);
+        req->size   = hton32 (size);
+        req->offset = hton64 (offset);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_READ,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return 0;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, NULL, 0, NULL);
+        return 0;
+
+}
+
+/**
+ * client_writev - writev function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @fd: file descriptor structure
+ * @vector:
+ * @count:
+ * @offset:
+ *
+ * external reference through client_protocol_xlator->fops->writev
+ */
+
+int
+client_writev (call_frame_t *frame, xlator_t *this, fd_t *fd,
+               struct iovec *vector, int32_t count, off_t offset,
+               struct iobref *iobref)
+{
+        gf_hdr_common_t    *hdr = NULL;
+        gf_fop_write_req_t *req = NULL;
+        size_t              hdrlen = 0;
+        int64_t             remote_fd = -1;
+        int                 ret = -1;
+        client_fd_ctx_t    *fdctx = NULL;
+        client_conf_t      *conf = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, NULL);
+                return 0;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, NULL);
+                return 0;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->fd     = hton64 (remote_fd);
+        req->size   = hton32 (iov_length (vector, count));
+        req->offset = hton64 (offset);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_WRITE,
+                                    hdr, hdrlen, vector, count, iobref);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+
+}
+
+
+/**
+ * client_statfs - statfs function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location
+ *
+ * external reference through client_protocol_xlator->fops->statfs
+ */
+
+int
+client_statfs (call_frame_t *frame, xlator_t *this, loc_t *loc)
+{
+        gf_hdr_common_t     *hdr = NULL;
+        gf_fop_statfs_req_t *req = NULL;
+        size_t               hdrlen = -1;
+        int                  ret = -1;
+        size_t               pathlen = 0;
+        ino_t                ino = 0;
+        ino_t                gen = 0;
+
+        pathlen = STRLEN_0 (loc->path);
+
+        if (loc->inode) {
+                ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+                if (loc->inode->ino && ret < 0) {
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "STATFS %"PRId64" (%s): "
+                                "failed to get remote inode number",
+                                loc->inode->ino, loc->path);
+                        goto unwind;
+                }
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen);
+        hdr    = gf_hdr_new (req, pathlen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino = hton64 (ino);
+        req->gen = hton64 (gen);
+        strcpy (req->path, loc->path);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_STATFS,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+
+}
+
+
+/**
+ * client_flush - flush function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @fd: file descriptor structure
+ *
+ * external reference through client_protocol_xlator->fops->flush
+ */
+
+int
+client_flush (call_frame_t *frame, xlator_t *this, fd_t *fd)
+{
+        gf_hdr_common_t     *hdr = NULL;
+        gf_fop_flush_req_t  *req = NULL;
+        size_t               hdrlen = 0;
+        int64_t              remote_fd = -1;
+        int                  ret = -1;
+        client_fd_ctx_t     *fdctx = NULL;
+        client_conf_t       *conf = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD);
+                return 0;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD);
+                return 0;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->fd = hton64 (remote_fd);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_FLUSH,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return 0;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+
+}
+
+/**
+ * client_fsync - fsync function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @fd: file descriptor structure
+ * @flags:
+ *
+ * external reference through client_protocol_xlator->fops->fsync
+ */
+
+int
+client_fsync (call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t flags)
+{
+        gf_hdr_common_t    *hdr = NULL;
+        gf_fop_fsync_req_t *req = NULL;
+        size_t              hdrlen = 0;
+        int64_t             remote_fd = -1;
+        int32_t             ret = -1;
+        client_fd_ctx_t    *fdctx = NULL;
+        client_conf_t      *conf = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD);
+                return 0;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD);
+                return 0;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->fd   = hton64 (remote_fd);
+        req->data = hton32 (flags);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_FSYNC,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+
+}
+
+int
+client_xattrop (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                gf_xattrop_flags_t flags, dict_t *dict)
+{
+        gf_hdr_common_t      *hdr = NULL;
+        gf_fop_xattrop_req_t *req = NULL;
+        size_t                hdrlen = 0;
+        size_t                dict_len = 0;
+        int32_t               ret = -1;
+        size_t                pathlen = 0;
+        ino_t                 ino = 0;
+        uint64_t              gen = 0;
+        char                 *buf = NULL;
+
+        GF_VALIDATE_OR_GOTO ("client", this, unwind);
+
+        GF_VALIDATE_OR_GOTO (this->name, loc, unwind);
+
+        if (dict) {
+                ret = dict_allocate_and_serialize (dict, &buf, &dict_len);
+                if (ret < 0) {
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "failed to get serialized length of dict(%p)",
+                                dict);
+                        goto unwind;
+                }
+        }
+
+        pathlen = STRLEN_0 (loc->path);
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "XATTROP %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, dict_len + pathlen);
+        hdr    = gf_hdr_new (req, dict_len + pathlen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->flags = hton32 (flags);
+        req->dict_len = hton32 (dict_len);
+        if (dict) {
+                memcpy (req->dict, buf, dict_len);
+                GF_FREE (buf);
+        }
+
+        req->ino = hton64 (ino);
+        req->gen = hton64 (gen);
+        strcpy (req->path + dict_len, loc->path);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_XATTROP,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+}
+
+
+int
+client_fxattrop (call_frame_t *frame, xlator_t *this, fd_t *fd,
+                 gf_xattrop_flags_t flags, dict_t *dict)
+{
+        gf_hdr_common_t       *hdr = NULL;
+        gf_fop_fxattrop_req_t *req = NULL;
+        size_t                 hdrlen = 0;
+        size_t                 dict_len = 0;
+        int64_t                remote_fd = -1;
+        int32_t                ret = -1;
+        ino_t                  ino = 0;
+        client_fd_ctx_t       *fdctx = NULL;
+        client_conf_t         *conf  = NULL;
+
+        conf = this->private;
+
+        if (dict) {
+                dict_len = dict_serialized_length (dict);
+                if (dict_len < 0) {
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "failed to get serialized length of dict(%p)",
+                                dict);
+                        goto unwind;
+                }
+        }
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. "
+                        "returning EBADFD",
+                        fd->inode->ino);
+                goto unwind;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                goto unwind;
+        }
+
+        ino = fd->inode->ino;
+        remote_fd = fdctx->remote_fd;
+
+        hdrlen = gf_hdr_len (req, dict_len);
+        hdr    = gf_hdr_new (req, dict_len);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->flags = hton32 (flags);
+        req->dict_len = hton32 (dict_len);
+        if (dict) {
+                ret = dict_serialize (dict, req->dict);
+                if (ret < 0) {
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "failed to serialize dictionary(%p)",
+                                dict);
+                        goto unwind;
+                }
+        }
+        req->fd = hton64 (remote_fd);
+        req->ino = hton64 (ino);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_FXATTROP,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EBADFD, NULL);
+        return 0;
+
+}
+
+/**
+ * client_setxattr - setxattr function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location
+ * @dict: dictionary which contains key:value to be set.
+ * @flags:
+ *
+ * external reference through client_protocol_xlator->fops->setxattr
+ */
+
+int
+client_setxattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                 dict_t *dict, int32_t flags)
+{
+        gf_hdr_common_t       *hdr = NULL;
+        gf_fop_setxattr_req_t *req = NULL;
+        size_t                 hdrlen = 0;
+        size_t                 dict_len = 0;
+        int                    ret = -1;
+        size_t                 pathlen = 0;
+        ino_t                  ino = 0;
+        uint64_t               gen = 0;
+
+        dict_len = dict_serialized_length (dict);
+        if (dict_len < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to get serialized length of dict(%p)",
+                        dict);
+                goto unwind;
+        }
+
+        pathlen = STRLEN_0 (loc->path);
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "SETXATTR %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, dict_len + pathlen);
+        hdr    = gf_hdr_new (req, dict_len + pathlen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino   = hton64 (ino);
+        req->gen   = hton64 (gen);
+        req->flags = hton32 (flags);
+        req->dict_len = hton32 (dict_len);
+
+        ret = dict_serialize (dict, req->dict);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to serialize dictionary(%p)",
+                        dict);
+                goto unwind;
+        }
+
+        strcpy (req->path + dict_len, loc->path);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_SETXATTR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+}
+
+/**
+ * client_fsetxattr - fsetxattr function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @fd: fd
+ * @dict: dictionary which contains key:value to be set.
+ * @flags:
+ *
+ * external reference through client_protocol_xlator->fops->fsetxattr
+ */
+
+int
+client_fsetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
+                  dict_t *dict, int32_t flags)
+{
+        gf_hdr_common_t        *hdr = NULL;
+        gf_fop_fsetxattr_req_t *req = NULL;
+        size_t                  hdrlen = 0;
+        size_t                  dict_len = 0;
+        ino_t                   ino;
+        int                     ret = -1;
+        int64_t                 remote_fd = -1;
+        client_fd_ctx_t        *fdctx = NULL;
+        client_conf_t          *conf  = NULL;
+
+        conf = this->private;
+
+        dict_len = dict_serialized_length (dict);
+        if (dict_len < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to get serialized length of dict(%p)",
+                        dict);
+                goto unwind;
+        }
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                goto unwind;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                goto unwind;
+        }
+
+        ino = fd->inode->ino;
+        remote_fd = fdctx->remote_fd;
+
+        hdrlen = gf_hdr_len (req, dict_len);
+        hdr    = gf_hdr_new (req, dict_len);
+
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino   = hton64 (ino);
+        req->fd    = hton64 (remote_fd);
+        req->flags = hton32 (flags);
+        req->dict_len = hton32 (dict_len);
+
+        ret = dict_serialize (dict, req->dict);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to serialize dictionary(%p)",
+                        dict);
+                goto unwind;
+        }
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_FSETXATTR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+}
+
+/**
+ * client_getxattr - getxattr function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location structure
+ *
+ * external reference through client_protocol_xlator->fops->getxattr
+ */
+
+int
+client_getxattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                 const char *name)
+{
+        int                    ret = -1;
+        gf_hdr_common_t       *hdr = NULL;
+        gf_fop_getxattr_req_t *req = NULL;
+        size_t                 hdrlen = 0;
+        size_t                 pathlen = 0;
+        size_t                 namelen = 0;
+        ino_t                  ino = 0;
+        uint64_t               gen = 0;
+
+        pathlen = STRLEN_0 (loc->path);
+        if (name)
+                namelen = STRLEN_0 (name);
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "GETXATTR %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen + namelen);
+        hdr    = gf_hdr_new (req, pathlen + namelen);
+        GF_VALIDATE_OR_GOTO (frame->this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino   = hton64 (ino);
+        req->gen   = hton64 (gen);
+        req->namelen = hton32 (namelen);
+        strcpy (req->path, loc->path);
+        if (name)
+                strcpy (req->name + pathlen, name);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_GETXATTR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+}
+
+
+/**
+ * client_fgetxattr - fgetxattr function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @fd: fd
+ *
+ * external reference through client_protocol_xlator->fops->fgetxattr
+ */
+
+int
+client_fgetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
+                  const char *name)
+{
+        int                     ret = -1;
+        gf_hdr_common_t        *hdr = NULL;
+        gf_fop_fgetxattr_req_t *req = NULL;
+        size_t                  hdrlen = 0;
+        int64_t                 remote_fd = -1;
+        size_t                  namelen = 0;
+        ino_t                   ino = 0;
+        client_fd_ctx_t        *fdctx = NULL;
+        client_conf_t          *conf  = NULL;
+
+        if (name)
+                namelen = STRLEN_0 (name);
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get remote fd. EBADFD",
+                        fd->inode->ino);
+                goto unwind;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                goto unwind;
+        }
+
+        ino = fd->inode->ino;
+        remote_fd = fdctx->remote_fd;
+
+        hdrlen = gf_hdr_len (req, namelen);
+        hdr    = gf_hdr_new (req, namelen);
+
+        GF_VALIDATE_OR_GOTO (frame->this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino   = hton64 (ino);
+        req->fd    = hton64 (remote_fd);
+        req->namelen = hton32 (namelen);
+
+        if (name)
+                strcpy (req->name, name);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_FGETXATTR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+}
+
+
+/**
+ * client_removexattr - removexattr function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location structure
+ * @name:
+ *
+ * external reference through client_protocol_xlator->fops->removexattr
+ */
+
+int
+client_removexattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                    const char *name)
+{
+        int                       ret = -1;
+        gf_hdr_common_t          *hdr = NULL;
+        gf_fop_removexattr_req_t *req = NULL;
+        size_t                    hdrlen = 0;
+        size_t                    namelen = 0;
+        size_t                    pathlen = 0;
+        ino_t                     ino = 0;
+        uint64_t                  gen = 0;
+
+        pathlen = STRLEN_0 (loc->path);
+        namelen = STRLEN_0 (name);
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "REMOVEXATTR %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen + namelen);
+        hdr    = gf_hdr_new (req, pathlen + namelen);
+        GF_VALIDATE_OR_GOTO (frame->this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino   = hton64 (ino);
+        req->gen   = hton64 (gen);
+        strcpy (req->path, loc->path);
+        strcpy (req->name + pathlen, name);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_REMOVEXATTR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+}
+
+/**
+ * client_opendir - opendir function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location structure
+ *
+ * external reference through client_protocol_xlator->fops->opendir
+ */
+
+int
+client_opendir (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                fd_t *fd)
+{
+        gf_fop_opendir_req_t *req = NULL;
+        gf_hdr_common_t      *hdr = NULL;
+        size_t                hdrlen = 0;
+        int                   ret = -1;
+        ino_t                 ino = 0;
+        uint64_t              gen = 0;
+        size_t                pathlen = 0;
+        client_local_t       *local = NULL;
+
+        local = GF_CALLOC (1, sizeof (*local), gf_client_mt_client_local_t);
+        GF_VALIDATE_OR_GOTO (this->name, local, unwind);
+
+        loc_copy (&local->loc, loc);
+        local->fd = fd_ref (fd);
+
+        frame->local = local;
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "OPENDIR %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        pathlen = STRLEN_0 (loc->path);
+
+        hdrlen = gf_hdr_len (req, pathlen);
+        hdr    = gf_hdr_new (req, pathlen);
+        GF_VALIDATE_OR_GOTO (frame->this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino = hton64 (ino);
+        req->gen = hton64 (gen);
+        strcpy (req->path, loc->path);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_OPENDIR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, fd);
+        return 0;
+
+}
+
+/**
+ * client_readdirp - readdirp function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ *
+ * external reference through client_protocol_xlator->fops->readdirp
+ */
+
+int
+client_readdirp (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
+                 off_t offset)
+{
+        gf_hdr_common_t         *hdr = NULL;
+        gf_fop_readdirp_req_t   *req = NULL;
+        size_t                  hdrlen = 0;
+        int64_t                 remote_fd = -1;
+        int                     ret = -1;
+        client_fd_ctx_t         *fdctx = NULL;
+        client_conf_t           *conf  = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE, "(%"PRId64"): failed to get"
+                        " fd ctx. EBADFD", fd->inode->ino);
+                goto unwind;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE, "(%"PRId64"): failed to get"
+                        " fd ctx. EBADFD", fd->inode->ino);
+                goto unwind;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req->fd     = hton64 (remote_fd);
+        req->size   = hton32 (size);
+        req->offset = hton64 (offset);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_READDIRP,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return 0;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EBADFD, NULL);
+        return 0;
+
+}
+
+
+/**
+ * client_readdir - readdir function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ *
+ * external reference through client_protocol_xlator->fops->readdir
+ */
+
+int
+client_readdir (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
+                off_t offset)
+{
+        gf_hdr_common_t       *hdr = NULL;
+        gf_fop_readdir_req_t  *req = NULL;
+        size_t                 hdrlen = 0;
+        int64_t                remote_fd = -1;
+        int                    ret = -1;
+        client_fd_ctx_t       *fdctx = NULL;
+        client_conf_t         *conf  = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                goto unwind;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE, "(%"PRId64"): failed to get"
+                        " fd ctx. EBADFD", fd->inode->ino);
+                goto unwind;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req->fd     = hton64 (remote_fd);
+        req->size   = hton32 (size);
+        req->offset = hton64 (offset);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_READDIR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return 0;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EBADFD, NULL);
+        return 0;
+
+}
+
+/**
+ * client_fsyncdir - fsyncdir function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @fd: file descriptor structure
+ * @flags:
+ *
+ * external reference through client_protocol_xlator->fops->fsyncdir
+ */
+
+int
+client_fsyncdir (call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t flags)
+{
+        gf_hdr_common_t       *hdr = NULL;
+        gf_fop_fsyncdir_req_t *req = NULL;
+        size_t                 hdrlen = 0;
+        int64_t                remote_fd = -1;
+        int32_t                ret = -1;
+        client_fd_ctx_t       *fdctx = NULL;
+        client_conf_t         *conf  = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                goto unwind;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE, "(%"PRId64"): failed to get"
+                        " fd ctx. EBADFD", fd->inode->ino);
+                goto unwind;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->data = hton32 (flags);
+        req->fd   = hton64 (remote_fd);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_FSYNCDIR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        STACK_UNWIND (frame, -1, EBADFD);
+        return 0;
+}
+
+/**
+ * client_access - access function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @loc: location structure
+ * @mode:
+ *
+ * external reference through client_protocol_xlator->fops->access
+ */
+
+int
+client_access (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t mask)
+{
+        gf_hdr_common_t     *hdr = NULL;
+        gf_fop_access_req_t *req = NULL;
+        size_t               hdrlen = -1;
+        int                  ret = -1;
+        ino_t                ino = 0;
+        uint64_t             gen = 0;
+        size_t               pathlen = 0;
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "ACCESS %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        pathlen = STRLEN_0 (loc->path);
+
+        hdrlen = gf_hdr_len (req, pathlen);
+        hdr    = gf_hdr_new (req, pathlen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino  = hton64 (ino);
+        req->gen  = hton64 (gen);
+        req->mask = hton32 (mask);
+        strcpy (req->path, loc->path);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_ACCESS,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+
+}
+
+/**
+ * client_ftrucate - ftruncate function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @fd: file descriptor structure
+ * @offset: offset to truncate to
+ *
+ * external reference through client_protocol_xlator->fops->ftruncate
+ */
+
+int
+client_ftruncate (call_frame_t *frame, xlator_t *this, fd_t *fd,
+                  off_t offset)
+{
+        gf_hdr_common_t        *hdr = NULL;
+        gf_fop_ftruncate_req_t *req = NULL;
+        int64_t                 remote_fd = -1;
+        size_t                  hdrlen = -1;
+        int                     ret = -1;
+        client_fd_ctx_t        *fdctx = NULL;
+        client_conf_t          *conf  = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, NULL);
+                return 0;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE, "(%"PRId64"): failed to get"
+                        " fd ctx. EBADFD", fd->inode->ino);
+                goto unwind;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->fd     = hton64 (remote_fd);
+        req->offset = hton64 (offset);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_FTRUNCATE,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+
+}
+
+/**
+ * client_fstat - fstat function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @fd: file descriptor structure
+ *
+ * external reference through client_protocol_xlator->fops->fstat
+ */
+
+int
+client_fstat (call_frame_t *frame, xlator_t *this, fd_t *fd)
+{
+        gf_hdr_common_t    *hdr = NULL;
+        gf_fop_fstat_req_t *req = NULL;
+        int64_t             remote_fd = -1;
+        size_t              hdrlen = -1;
+        int                 ret = -1;
+        client_fd_ctx_t    *fdctx = NULL;
+        client_conf_t      *conf  = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, NULL);
+                return 0;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE, "(%"PRId64"): failed to get"
+                        " fd ctx. EBADFD", fd->inode->ino);
+                goto unwind;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->fd = hton64 (remote_fd);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_FSTAT,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+
+}
+
+/**
+ * client_lk - lk function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @fd: file descriptor structure
+ * @cmd: lock command
+ * @lock:
+ *
+ * external reference through client_protocol_xlator->fops->lk
+ */
+
+int
+client_lk (call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t cmd,
+           struct flock *flock)
+{
+        int              ret = -1;
+        gf_hdr_common_t *hdr = NULL;
+        gf_fop_lk_req_t *req = NULL;
+        size_t           hdrlen = 0;
+        int64_t          remote_fd = -1;
+        int32_t          gf_cmd = 0;
+        int32_t          gf_type = 0;
+        client_fd_ctx_t *fdctx = NULL;
+        client_conf_t   *conf  = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, NULL);
+                return 0;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE, "(%"PRId64"): failed to get"
+                        " fd ctx. EBADFD", fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, NULL);
+                return 0;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        if (cmd == F_GETLK || cmd == F_GETLK64)
+                gf_cmd = GF_LK_GETLK;
+        else if (cmd == F_SETLK || cmd == F_SETLK64)
+                gf_cmd = GF_LK_SETLK;
+        else if (cmd == F_SETLKW || cmd == F_SETLKW64)
+                gf_cmd = GF_LK_SETLKW;
+        else {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Unknown cmd (%d)!", gf_cmd);
+                goto unwind;
+        }
+
+        switch (flock->l_type) {
+        case F_RDLCK:
+                gf_type = GF_LK_F_RDLCK;
+                break;
+        case F_WRLCK:
+                gf_type = GF_LK_F_WRLCK;
+                break;
+        case F_UNLCK:
+                gf_type = GF_LK_F_UNLCK;
+                break;
+        }
+
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->fd   = hton64 (remote_fd);
+        req->cmd  = hton32 (gf_cmd);
+        req->type = hton32 (gf_type);
+        gf_flock_from_flock (&req->flock, flock);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_LK,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+}
+
+/**
+ * client_inodelk - inodelk function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @inode: inode structure
+ * @cmd: lock command
+ * @lock: flock struct
+ *
+ * external reference through client_protocol_xlator->fops->inodelk
+ */
+
+int
+client_inodelk (call_frame_t *frame, xlator_t *this, const char *volume,
+                loc_t *loc, int32_t cmd, struct flock *flock)
+{
+        int                   ret = -1;
+        gf_hdr_common_t      *hdr = NULL;
+        gf_fop_inodelk_req_t *req = NULL;
+        size_t                hdrlen = 0;
+        int32_t               gf_cmd = 0;
+        int32_t               gf_type = 0;
+        ino_t                 ino  = 0;
+        uint64_t              gen  = 0;
+        size_t                pathlen = 0;
+        size_t                vollen  = 0;
+
+        pathlen = STRLEN_0 (loc->path);
+        vollen  = STRLEN_0 (volume);
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "INODELK %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        if (cmd == F_GETLK || cmd == F_GETLK64)
+                gf_cmd = GF_LK_GETLK;
+        else if (cmd == F_SETLK || cmd == F_SETLK64)
+                gf_cmd = GF_LK_SETLK;
+        else if (cmd == F_SETLKW || cmd == F_SETLKW64)
+                gf_cmd = GF_LK_SETLKW;
+        else {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Unknown cmd (%d)!", gf_cmd);
+                goto unwind;
+        }
+
+        switch (flock->l_type) {
+        case F_RDLCK:
+                gf_type = GF_LK_F_RDLCK;
+                break;
+        case F_WRLCK:
+                gf_type = GF_LK_F_WRLCK;
+                break;
+        case F_UNLCK:
+                gf_type = GF_LK_F_UNLCK;
+                break;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen + vollen);
+        hdr    = gf_hdr_new (req, pathlen + vollen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        strcpy (req->path, loc->path);
+        strcpy (req->path + pathlen, volume);
+
+        req->ino  = hton64 (ino);
+        req->gen  = hton64 (gen);
+
+        req->cmd  = hton32 (gf_cmd);
+        req->type = hton32 (gf_type);
+        gf_flock_from_flock (&req->flock, flock);
+
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST,
+                                    GF_PROTO_FOP_INODELK,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+
+}
+
+
+/**
+ * client_finodelk - finodelk function for client protocol
+ * @frame: call frame
+ * @this: this translator structure
+ * @inode: inode structure
+ * @cmd: lock command
+ * @lock: flock struct
+ *
+ * external reference through client_protocol_xlator->fops->finodelk
+ */
+
+int
+client_finodelk (call_frame_t *frame, xlator_t *this, const char *volume,
+                 fd_t *fd, int32_t cmd, struct flock *flock)
+{
+        int                    ret = -1;
+        gf_hdr_common_t       *hdr = NULL;
+        gf_fop_finodelk_req_t *req = NULL;
+        size_t                 hdrlen = 0;
+        size_t                 vollen = 0;
+        int32_t                gf_cmd = 0;
+        int32_t                gf_type = 0;
+        int64_t                remote_fd = -1;
+        client_fd_ctx_t       *fdctx = NULL;
+        client_conf_t         *conf  = NULL;
+
+        vollen = STRLEN_0 (volume);
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD);
+                return 0;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD);
+                return 0;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        if (cmd == F_GETLK || cmd == F_GETLK64)
+                gf_cmd = GF_LK_GETLK;
+        else if (cmd == F_SETLK || cmd == F_SETLK64)
+                gf_cmd = GF_LK_SETLK;
+        else if (cmd == F_SETLKW || cmd == F_SETLKW64)
+                gf_cmd = GF_LK_SETLKW;
+        else {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Unknown cmd (%d)!", gf_cmd);
+                goto unwind;
+        }
+
+        switch (flock->l_type) {
+        case F_RDLCK:
+                gf_type = GF_LK_F_RDLCK;
+                break;
+        case F_WRLCK:
+                gf_type = GF_LK_F_WRLCK;
+                break;
+        case F_UNLCK:
+                gf_type = GF_LK_F_UNLCK;
+                break;
+        }
+
+        hdrlen = gf_hdr_len (req, vollen);
+        hdr    = gf_hdr_new (req, vollen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        strcpy (req->volume, volume);
+
+        req->fd = hton64 (remote_fd);
+
+        req->cmd  = hton32 (gf_cmd);
+        req->type = hton32 (gf_type);
+        gf_flock_from_flock (&req->flock, flock);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST,
+                                    GF_PROTO_FOP_FINODELK,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+}
+
+
+int
+client_entrylk (call_frame_t *frame, xlator_t *this, const char *volume,
+                loc_t *loc, const char *name, entrylk_cmd cmd,
+                entrylk_type type)
+{
+        gf_hdr_common_t      *hdr = NULL;
+        gf_fop_entrylk_req_t *req = NULL;
+        size_t                pathlen = 0;
+        size_t                vollen  = 0;
+        size_t                hdrlen = -1;
+        int                   ret = -1;
+        ino_t                 ino = 0;
+        uint64_t              gen = 0;
+        size_t                namelen = 0;
+
+        pathlen = STRLEN_0 (loc->path);
+        vollen  = STRLEN_0 (volume);
+
+        if (name)
+                namelen = STRLEN_0 (name);
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "ENTRYLK %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen + vollen + namelen);
+        hdr    = gf_hdr_new (req, pathlen + vollen + namelen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino  = hton64 (ino);
+        req->gen  = hton64 (gen);
+        req->namelen = hton64 (namelen);
+
+        strcpy (req->path, loc->path);
+        if (name)
+                strcpy (req->name + pathlen, name);
+        strcpy (req->volume + pathlen + namelen, volume);
+
+        req->cmd  = hton32 (cmd);
+        req->type = hton32 (type);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_ENTRYLK,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+
+}
+
+
+int
+client_fentrylk (call_frame_t *frame, xlator_t *this, const char *volume,
+                 fd_t *fd, const char *name, entrylk_cmd cmd,
+                 entrylk_type type)
+{
+        gf_hdr_common_t        *hdr = NULL;
+        gf_fop_fentrylk_req_t  *req = NULL;
+        int64_t                 remote_fd = -1;
+        size_t                  vollen  = 0;
+        size_t                  namelen = 0;
+        size_t                  hdrlen = -1;
+        int                     ret = -1;
+        client_fd_ctx_t        *fdctx = NULL;
+        client_conf_t          *conf  = NULL;
+
+        if (name)
+                namelen = STRLEN_0 (name);
+
+        conf = this->private;
+
+        vollen = STRLEN_0 (volume);
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD);
+                return 0;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD);
+                return 0;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        hdrlen = gf_hdr_len (req, namelen + vollen);
+        hdr    = gf_hdr_new (req, namelen + vollen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->fd = hton64 (remote_fd);
+        req->namelen = hton64 (namelen);
+
+        if (name)
+                strcpy (req->name, name);
+
+        strcpy (req->volume + namelen, volume);
+
+        req->cmd  = hton32 (cmd);
+        req->type = hton32 (type);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_FENTRYLK,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+
+        STACK_UNWIND (frame, -1, EINVAL);
+        return 0;
+}
+
+/*
+ * client_lookup - lookup function for client protocol
+ * @frame: call frame
+ * @this:
+ * @loc: location
+ *
+ * not for external reference
+ */
+
+int
+client_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc,
+               dict_t *xattr_req)
+{
+        gf_hdr_common_t     *hdr = NULL;
+        gf_fop_lookup_req_t *req = NULL;
+        size_t               hdrlen = -1;
+        int                  ret = -1;
+        ino_t                ino = 0;
+        ino_t                par = 0;
+        uint64_t             gen = 0;
+        size_t               dictlen = 0;
+        size_t               pathlen = 0;
+        size_t               baselen = 0;
+        int32_t              op_ret = -1;
+        int32_t              op_errno = EINVAL;
+        client_local_t      *local = NULL;
+        char                *buf = NULL;
+
+        local = GF_CALLOC (1, sizeof (*local), gf_client_mt_client_local_t);
+        GF_VALIDATE_OR_GOTO (this->name, local, unwind);
+
+        loc_copy (&local->loc, loc);
+
+        frame->local = local;
+
+        GF_VALIDATE_OR_GOTO (this->name, loc, unwind);
+        GF_VALIDATE_OR_GOTO (this->name, loc->path, unwind);
+
+        if (loc->ino != 1 && loc->parent) {
+                ret = inode_ctx_get2 (loc->parent, this, &par, &gen);
+                if (loc->parent->ino && ret < 0) {
+                        gf_log (this->name, GF_LOG_TRACE,
+                                "LOOKUP %"PRId64"/%s (%s): failed to get "
+                                "remote inode number for parent",
+                                loc->parent->ino, loc->name, loc->path);
+                        goto unwind;
+                }
+                GF_VALIDATE_OR_GOTO (this->name, loc->name, unwind);
+                baselen = STRLEN_0 (loc->name);
+        } else {
+                ino = 1;
+        }
+
+        pathlen = STRLEN_0 (loc->path);
+
+        if (xattr_req) {
+                ret = dict_allocate_and_serialize (xattr_req, &buf, &dictlen);
+                if (ret < 0) {
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "failed to get serialized length of dict(%p)",
+                                xattr_req);
+                        goto unwind;
+                }
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen + baselen + dictlen);
+        hdr    = gf_hdr_new (req, pathlen + baselen + dictlen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino   = hton64 (ino);
+        req->gen   = hton64 (gen);
+        req->par   = hton64 (par);
+        strcpy (req->path, loc->path);
+        if (baselen)
+                strcpy (req->path + pathlen, loc->name);
+
+        if (dictlen > 0) {
+                memcpy (req->dict + pathlen + baselen, buf, dictlen);
+                GF_FREE (buf);
+        }
+
+        req->dictlen = hton32 (dictlen);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_LOOKUP,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+
+unwind:
+        STACK_UNWIND (frame, op_ret, op_errno, loc->inode, NULL, NULL);
+        return ret;
+}
+
+
+int
+client_setattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                struct iatt *stbuf, int32_t valid)
+{
+        gf_hdr_common_t      *hdr = NULL;
+        gf_fop_setattr_req_t *req = NULL;
+        size_t                hdrlen = 0;
+        size_t                pathlen = 0;
+        ino_t                 ino = 0;
+        uint64_t              gen = 0;
+        int                   ret = -1;
+
+        GF_VALIDATE_OR_GOTO ("client", this, unwind);
+        GF_VALIDATE_OR_GOTO (this->name, frame, unwind);
+
+        pathlen = STRLEN_0 (loc->path);
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "SETATTR %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                goto unwind;
+        }
+
+        hdrlen = gf_hdr_len (req, pathlen);
+        hdr    = gf_hdr_new (req, pathlen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->ino  = hton64 (ino);
+        req->gen  = hton64 (gen);
+        strcpy (req->path, loc->path);
+
+        gf_stat_from_iatt (&req->stbuf, stbuf);
+        req->valid = hton32 (valid);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_SETATTR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+}
+
+
+int
+client_fsetattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
+                 struct iatt *stbuf, int32_t valid)
+{
+        gf_hdr_common_t       *hdr = NULL;
+        gf_fop_fsetattr_req_t *req = NULL;
+        size_t                 hdrlen = 0;
+        int                    ret = -1;
+        client_fd_ctx_t       *fdctx = NULL;
+        int64_t                remote_fd = -1;
+        client_conf_t         *conf  = NULL;
+
+        GF_VALIDATE_OR_GOTO ("client", this, unwind);
+        GF_VALIDATE_OR_GOTO (this->name, frame, unwind);
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, NULL, NULL);
+                return 0;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, NULL, NULL);
+                return 0;
+        }
+
+        remote_fd = fdctx->remote_fd;
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req    = gf_param (hdr);
+
+        req->fd = hton64 (remote_fd);
+
+        gf_stat_from_iatt (&req->stbuf, stbuf);
+        req->valid = hton32 (valid);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_FSETATTR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        STACK_UNWIND (frame, -1, EINVAL, NULL, NULL);
+        return 0;
+}
+
+
+int
+client_fdctx_destroy (xlator_t *this, client_fd_ctx_t *fdctx)
+{
+        call_frame_t             *fr = NULL;
+        int32_t                   ret = -1;
+        gf_hdr_common_t          *hdr = NULL;
+        size_t                    hdrlen = 0;
+        gf_cbk_release_req_t     *req = NULL;
+        gf_cbk_releasedir_req_t  *reqdir = NULL;
+        int64_t                   remote_fd = -1;
+        int                       op = 0;
+
+        remote_fd = fdctx->remote_fd;
+
+        if (remote_fd == -1)
+                goto out;
+
+        if (fdctx->is_dir) {
+                hdrlen     = gf_hdr_len (reqdir, 0);
+                hdr        = gf_hdr_new (reqdir, 0);
+                op         = GF_CBK_RELEASEDIR;
+                reqdir     = gf_param (hdr);
+                reqdir->fd = hton64 (remote_fd);
+        } else {
+                hdrlen  = gf_hdr_len (req, 0);
+                hdr     = gf_hdr_new (req, 0);
+                op      = GF_CBK_RELEASE;
+                req     = gf_param (hdr);
+                req->fd = hton64 (remote_fd);
+        }
+
+        fr = create_frame (this, this->ctx->pool);
+
+        ret = protocol_client_xfer (fr, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_CBK_REQUEST, op,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+out:
+        inode_unref (fdctx->inode);
+        GF_FREE (fdctx);
+
+        return ret;
+}
+
+
+/**
+ * client_releasedir - releasedir function for client protocol
+ * @this: this translator structure
+ * @fd: file descriptor structure
+ *
+ * external reference through client_protocol_xlator->cbks->releasedir
+ */
+
+int
+client_releasedir (xlator_t *this, fd_t *fd)
+{
+        int64_t                remote_fd = -1;
+        client_conf_t         *conf = NULL;
+        client_fd_ctx_t       *fdctx = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_del_ctx (fd, this);
+                if (fdctx != NULL) {
+                        remote_fd = fdctx->remote_fd;
+
+                        /* fdctx->remote_fd == -1 indicates a reopen attempt
+                           in progress. Just mark ->released = 1 and let
+                           reopen_cbk handle releasing
+                        */
+
+                        if (remote_fd != -1)
+                                list_del_init (&fdctx->sfd_pos);
+
+                        fdctx->released = 1;
+                }
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (remote_fd != -1)
+                client_fdctx_destroy (this, fdctx);
+
+        return 0;
+}
+
+
+/**
+ * client_release - release function for client protocol
+ * @this: this translator structure
+ * @fd: file descriptor structure
+ *
+ * external reference through client_protocol_xlator->cbks->release
+ *
+ */
+int
+client_release (xlator_t *this, fd_t *fd)
+{
+        int64_t                remote_fd = -1;
+        client_conf_t         *conf = NULL;
+        client_fd_ctx_t       *fdctx = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_del_ctx (fd, this);
+                if (fdctx != NULL) {
+                        remote_fd = fdctx->remote_fd;
+
+                        /* fdctx->remote_fd == -1 indicates a reopen attempt
+                           in progress. Just mark ->released = 1 and let
+                           reopen_cbk handle releasing
+                        */
+
+                        if (remote_fd != -1)
+                                list_del_init (&fdctx->sfd_pos);
+
+                        fdctx->released = 1;
+                }
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (remote_fd != -1)
+                client_fdctx_destroy (this, fdctx);
+
+        return 0;
+}
+
+/*
+ * MGMT_OPS
+ */
+
+/* Callbacks */
+
+int
+client_fxattrop_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                     struct iobuf *iobuf)
+{
+        gf_fop_xattrop_rsp_t *rsp = NULL;
+        int32_t               op_ret   = 0;
+        int32_t               gf_errno = 0;
+        int32_t               op_errno = 0;
+        int32_t               dict_len = 0;
+        dict_t               *dict = NULL;
+        int32_t               ret = -1;
+        char                 *dictbuf = NULL;
+
+        rsp = gf_param (hdr);
+        GF_VALIDATE_OR_GOTO (frame->this->name, rsp, fail);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+
+        if (op_ret >= 0) {
+                op_ret = -1;
+                dict_len = ntoh32 (rsp->dict_len);
+
+                if (dict_len > 0) {
+                        dictbuf = memdup (rsp->dict, dict_len);
+                        GF_VALIDATE_OR_GOTO (frame->this->name, dictbuf, fail);
+
+                        dict = dict_new();
+                        GF_VALIDATE_OR_GOTO (frame->this->name, dict, fail);
+
+                        ret = dict_unserialize (dictbuf, dict_len, &dict);
+                        if (ret < 0) {
+                                gf_log (frame->this->name, GF_LOG_DEBUG,
+                                        "failed to serialize dictionary(%p)",
+                                        dict);
+                                op_errno = -ret;
+                                goto fail;
+                        } else {
+                                dict->extra_free = dictbuf;
+                                dictbuf = NULL;
+                        }
+                }
+                op_ret = 0;
+        }
+        gf_errno = ntoh32 (hdr->rsp.op_errno);
+        op_errno = gf_error_to_errno (gf_errno);
+
+fail:
+        STACK_UNWIND (frame, op_ret, op_errno, dict);
+
+        if (dictbuf)
+                GF_FREE (dictbuf);
+
+        if (dict)
+                dict_unref (dict);
+
+        return 0;
+}
+
+
+int
+client_xattrop_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                    struct iobuf *iobuf)
+{
+        gf_fop_xattrop_rsp_t *rsp = NULL;
+        int32_t               op_ret   = -1;
+        int32_t               gf_errno = EINVAL;
+        int32_t               op_errno = 0;
+        int32_t               dict_len = 0;
+        dict_t               *dict = NULL;
+        int32_t               ret = -1;
+        char                 *dictbuf = NULL;
+
+        rsp = gf_param (hdr);
+        GF_VALIDATE_OR_GOTO (frame->this->name, rsp, fail);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        if (op_ret >= 0) {
+                op_ret = -1;
+                dict_len = ntoh32 (rsp->dict_len);
+
+                if (dict_len > 0) {
+                        dictbuf = memdup (rsp->dict, dict_len);
+                        GF_VALIDATE_OR_GOTO (frame->this->name, dictbuf, fail);
+
+                        dict = get_new_dict();
+                        GF_VALIDATE_OR_GOTO (frame->this->name, dict, fail);
+                        dict_ref (dict);
+
+                        ret = dict_unserialize (dictbuf, dict_len, &dict);
+                        if (ret < 0) {
+                                gf_log (frame->this->name, GF_LOG_DEBUG,
+                                        "failed to serialize dictionary(%p)",
+                                        dict);
+                                goto fail;
+                        } else {
+                                dict->extra_free = dictbuf;
+                                dictbuf = NULL;
+                        }
+                }
+                op_ret = 0;
+        }
+        gf_errno = ntoh32 (hdr->rsp.op_errno);
+        op_errno = gf_error_to_errno (gf_errno);
+
+
+fail:
+        STACK_UNWIND (frame, op_ret, op_errno, dict);
+
+        if (dictbuf)
+                GF_FREE (dictbuf);
+        if (dict)
+                dict_unref (dict);
+
+        return 0;
+}
+
+/*
+ * client_create_cbk - create callback function for client protocol
+ * @frame: call frame
+ * @args: arguments in dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_create_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                   struct iobuf *iobuf)
+{
+        gf_fop_create_rsp_t  *rsp = NULL;
+        int32_t               op_ret = 0;
+        int32_t               op_errno = 0;
+        fd_t                 *fd = NULL;
+        inode_t              *inode = NULL;
+        struct iatt           stbuf = {0, };
+        struct iatt           preparent = {0, };
+        struct iatt           postparent = {0, };
+        int64_t               remote_fd = 0;
+        int32_t               ret = -1;
+        client_local_t       *local = NULL;
+        client_conf_t        *conf = NULL;
+        client_fd_ctx_t      *fdctx = NULL;
+        ino_t                 ino = 0;
+        uint64_t              gen = 0;
+
+        local = frame->local; frame->local = NULL;
+        conf  = frame->this->private;
+        fd    = local->fd;
+        inode = local->loc.inode;
+
+        rsp = gf_param (hdr);
+
+        op_ret    = ntoh32 (hdr->rsp.op_ret);
+        op_errno  = ntoh32 (hdr->rsp.op_errno);
+
+        if (op_ret >= 0) {
+                remote_fd = ntoh64 (rsp->fd);
+                gf_stat_to_iatt (&rsp->stat, &stbuf);
+
+                gf_stat_to_iatt (&rsp->preparent, &preparent);
+                gf_stat_to_iatt (&rsp->postparent, &postparent);
+
+                ino = stbuf.ia_ino;
+                gen = stbuf.ia_gen;
+        }
+
+        if (op_ret >= 0) {
+                ret = inode_ctx_put2 (local->loc.inode, frame->this, ino, gen);
+
+                if (ret < 0) {
+                        gf_log (frame->this->name, GF_LOG_DEBUG,
+                                "CREATE %"PRId64"/%s (%s): failed to set "
+                                "remote inode number to inode ctx",
+                                local->loc.parent->ino, local->loc.name,
+                                local->loc.path);
+                        op_ret = -1;
+                        op_errno = EINVAL;
+                        goto unwind_out;
+                }
+
+                fdctx = GF_CALLOC (1, sizeof (*fdctx),
+                                   gf_client_mt_client_fd_ctx_t);
+                if (!fdctx) {
+                        op_ret = -1;
+                        op_errno = ENOMEM;
+                        goto unwind_out;
+                }
+
+                fdctx->remote_fd = remote_fd;
+                fdctx->inode     = inode_ref (fd->inode);
+                fdctx->ino       = ino;
+                fdctx->gen       = gen;
+                fdctx->flags     = local->flags;
+
+                INIT_LIST_HEAD (&fdctx->sfd_pos);
+
+                this_fd_set_ctx (fd, frame->this, &local->loc, fdctx);
+
+                pthread_mutex_lock (&conf->mutex);
+                {
+                        list_add_tail (&fdctx->sfd_pos, &conf->saved_fds);
+                }
+                pthread_mutex_unlock (&conf->mutex);
+        }
+unwind_out:
+        STACK_UNWIND (frame, op_ret, op_errno, fd, inode, &stbuf,
+                      &preparent, &postparent);
+
+        client_local_wipe (local);
+
+        return 0;
+}
+
+
+/*
+ * client_open_cbk - open callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+int
+client_open_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                 struct iobuf *iobuf)
+{
+        int32_t              op_ret = -1;
+        int32_t              op_errno = ENOTCONN;
+        fd_t                *fd = NULL;
+        int64_t              remote_fd = 0;
+        gf_fop_open_rsp_t   *rsp = NULL;
+        client_local_t      *local = NULL;
+        client_conf_t       *conf = NULL;
+        client_fd_ctx_t     *fdctx = NULL;
+        ino_t                ino = 0;
+        uint64_t             gen = 0;
+
+
+        local = frame->local;
+
+        if (local->op) {
+                local->op (frame, hdr, hdrlen, iobuf);
+                return 0;
+        }
+
+        frame->local = NULL;
+        conf  = frame->this->private;
+        fd    = local->fd;
+
+        rsp = gf_param (hdr);
+
+        op_ret    = ntoh32 (hdr->rsp.op_ret);
+        op_errno  = ntoh32 (hdr->rsp.op_errno);
+
+        if (op_ret >= 0) {
+                remote_fd = ntoh64 (rsp->fd);
+        }
+
+        if (op_ret >= 0) {
+                fdctx = GF_CALLOC (1, sizeof (*fdctx),
+                                   gf_client_mt_client_fd_ctx_t);
+                if (!fdctx) {
+                        op_ret = -1;
+                        op_errno = ENOMEM;
+                        goto unwind_out;
+                }
+
+                inode_ctx_get2 (fd->inode, frame->this, &ino, &gen);
+
+                fdctx->remote_fd = remote_fd;
+                fdctx->inode     = inode_ref (fd->inode);
+                fdctx->ino       = ino;
+                fdctx->gen       = gen;
+                fdctx->flags     = local->flags;
+                fdctx->wbflags   = local->wbflags;
+
+                INIT_LIST_HEAD (&fdctx->sfd_pos);
+
+                this_fd_set_ctx (fd, frame->this, &local->loc, fdctx);
+
+                pthread_mutex_lock (&conf->mutex);
+                {
+                        list_add_tail (&fdctx->sfd_pos, &conf->saved_fds);
+                }
+                pthread_mutex_unlock (&conf->mutex);
+        }
+unwind_out:
+        STACK_UNWIND (frame, op_ret, op_errno, fd);
+
+        client_local_wipe (local);
+
+        return 0;
+}
+
+/*
+ * client_stat_cbk - stat callback for client protocol
+ * @frame: call frame
+ * @args: arguments dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_stat_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                 struct iobuf *iobuf)
+{
+        struct iatt        stbuf = {0, };
+        gf_fop_stat_rsp_t *rsp = NULL;
+        int32_t            op_ret = 0;
+        int32_t            op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret == 0) {
+                gf_stat_to_iatt (&rsp->stat, &stbuf);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &stbuf);
+
+        return 0;
+}
+
+
+/*
+ * client_mknod_cbk - mknod callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_mknod_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                  struct iobuf *iobuf)
+{
+        gf_fop_mknod_rsp_t *rsp = NULL;
+        int32_t             op_ret = 0;
+        int32_t             op_errno = 0;
+        struct iatt         stbuf = {0, };
+        inode_t            *inode = NULL;
+        client_local_t     *local = NULL;
+        int                 ret = 0;
+        struct iatt         preparent = {0,};
+        struct iatt         postparent = {0,};
+
+        local = frame->local;
+        frame->local = NULL;
+        inode = local->loc.inode;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret >= 0) {
+                gf_stat_to_iatt (&rsp->stat, &stbuf);
+
+                ret = inode_ctx_put2 (local->loc.inode, frame->this,
+                                      stbuf.ia_ino, stbuf.ia_gen);
+                if (ret < 0) {
+                        gf_log (frame->this->name, GF_LOG_DEBUG,
+                                "MKNOD %"PRId64"/%s (%s): failed to set remote"
+                                " inode number to inode ctx",
+                                local->loc.parent->ino, local->loc.name,
+                                local->loc.path);
+
+                        STACK_UNWIND (frame, -1, EINVAL, inode, NULL,
+                                      NULL, NULL);
+                        return 0;
+                }
+
+                gf_stat_to_iatt (&rsp->preparent, &preparent);
+                gf_stat_to_iatt (&rsp->postparent, &postparent);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, inode, &stbuf,
+                      &preparent, &postparent);
+
+        client_local_wipe (local);
+
+        return 0;
+}
+
+/*
+ * client_symlink_cbk - symlink callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_symlink_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                    struct iobuf *iobuf)
+{
+        gf_fop_symlink_rsp_t *rsp = NULL;
+        int32_t               op_ret = 0;
+        int32_t               op_errno = 0;
+        struct iatt           stbuf = {0, };
+        struct iatt           preparent = {0,};
+        struct iatt           postparent = {0,};
+        inode_t              *inode = NULL;
+        client_local_t       *local = NULL;
+        int                   ret = 0;
+
+        local = frame->local;
+        frame->local = NULL;
+        inode = local->loc.inode;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret >= 0) {
+                gf_stat_to_iatt (&rsp->stat, &stbuf);
+
+                ret = inode_ctx_put2 (inode, frame->this,
+                                      stbuf.ia_ino, stbuf.ia_gen);
+                if (ret < 0) {
+                        gf_log (frame->this->name, GF_LOG_DEBUG,
+                                "SYMLINK %"PRId64"/%s (%s): failed to set "
+                                "remote inode number to inode ctx",
+                                local->loc.parent->ino, local->loc.name,
+                                local->loc.path);
+                        STACK_UNWIND (frame, -1, EINVAL, inode, NULL,
+                                      NULL, NULL);
+                        return 0;
+                }
+                gf_stat_to_iatt (&rsp->preparent, &preparent);
+                gf_stat_to_iatt (&rsp->postparent, &postparent);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, inode, &stbuf,
+                      &preparent, &postparent);
+
+        client_local_wipe (local);
+
+        return 0;
+}
+
+/*
+ * client_link_cbk - link callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_link_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                 struct iobuf *iobuf)
+{
+        gf_fop_link_rsp_t *rsp = NULL;
+        int32_t            op_ret = 0;
+        int32_t            op_errno = 0;
+        struct iatt        stbuf = {0, };
+        inode_t           *inode = NULL;
+        client_local_t    *local = NULL;
+        struct iatt        preparent = {0,};
+        struct iatt        postparent = {0,};
+
+        local = frame->local;
+        frame->local = NULL;
+        inode = local->loc.inode;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret >= 0) {
+                gf_stat_to_iatt (&rsp->stat, &stbuf);
+
+                gf_stat_to_iatt (&rsp->preparent, &preparent);
+                gf_stat_to_iatt (&rsp->postparent, &postparent);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, inode, &stbuf,
+                      &preparent, &postparent);
+
+        client_local_wipe (local);
+
+        return 0;
+}
+
+/*
+ * client_truncate_cbk - truncate callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_truncate_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                     struct iobuf *iobuf)
+{
+        gf_fop_truncate_rsp_t *rsp = NULL;
+        int32_t                op_ret = 0;
+        int32_t                op_errno = 0;
+        struct iatt         prestat = {0, };
+        struct iatt         poststat = {0, };
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret == 0) {
+                gf_stat_to_iatt (&rsp->prestat, &prestat);
+                gf_stat_to_iatt (&rsp->poststat, &poststat);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &prestat, &poststat);
+
+        return 0;
+}
+
+/* client_fstat_cbk - fstat callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_fstat_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                  struct iobuf *iobuf)
+{
+        struct iatt         stbuf = {0, };
+        gf_fop_fstat_rsp_t *rsp = NULL;
+        int32_t             op_ret = 0;
+        int32_t             op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret == 0) {
+                gf_stat_to_iatt (&rsp->stat, &stbuf);
+
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &stbuf);
+
+        return 0;
+}
+
+/*
+ * client_ftruncate_cbk - ftruncate callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+int
+client_ftruncate_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                      struct iobuf *iobuf)
+{
+        gf_fop_ftruncate_rsp_t *rsp = NULL;
+        int32_t                 op_ret = 0;
+        int32_t                 op_errno = 0;
+        struct iatt             prestat = {0, };
+        struct iatt             poststat = {0, };
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret == 0) {
+                gf_stat_to_iatt (&rsp->prestat, &prestat);
+                gf_stat_to_iatt (&rsp->poststat, &poststat);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &prestat, &poststat);
+
+        return 0;
+}
+
+
+/* client_readv_cbk - readv callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external referece
+ */
+
+int
+client_readv_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                  struct iobuf *iobuf)
+{
+        gf_fop_read_rsp_t  *rsp = NULL;
+        int32_t             op_ret = 0;
+        int32_t             op_errno = 0;
+        struct iovec        vector = {0, };
+        struct iatt         stbuf = {0, };
+        struct iobref      *iobref = NULL;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret != -1) {
+                iobref = iobref_new ();
+                gf_stat_to_iatt (&rsp->stat, &stbuf);
+                vector.iov_len  = op_ret;
+
+                if (op_ret > 0) {
+                        vector.iov_base = iobuf->ptr;
+                        iobref_add (iobref, iobuf);
+                }
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &vector, 1, &stbuf, iobref);
+
+        if (iobref)
+                iobref_unref (iobref);
+
+        if (iobuf)
+                iobuf_unref (iobuf);
+
+        return 0;
+}
+
+/*
+ * client_write_cbk - write callback for client protocol
+ * @frame: cal frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_write_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                  struct iobuf *iobuf)
+{
+        gf_fop_write_rsp_t *rsp = NULL;
+        int32_t             op_ret = 0;
+        int32_t             op_errno = 0;
+        struct iatt         prestat = {0, };
+        struct iatt         poststat = {0, };
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret >= 0) {
+                gf_stat_to_iatt (&rsp->prestat, &prestat);
+                gf_stat_to_iatt (&rsp->poststat, &poststat);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &prestat, &poststat);
+
+        return 0;
+}
+
+
+int
+client_readdirp_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                     struct iobuf *iobuf)
+{
+        gf_fop_readdirp_rsp_t   *rsp = NULL;
+        int32_t                 op_ret = 0;
+        int32_t                 op_errno = 0;
+        uint32_t                buf_size = 0;
+        gf_dirent_t             entries;
+
+        rsp = gf_param (hdr);
+
+        op_ret    = ntoh32 (hdr->rsp.op_ret);
+        op_errno  = ntoh32 (hdr->rsp.op_errno);
+
+        INIT_LIST_HEAD (&entries.list);
+        if (op_ret > 0) {
+                buf_size = ntoh32 (rsp->size);
+                gf_dirent_unserialize (&entries, rsp->buf, buf_size);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &entries);
+
+        gf_dirent_free (&entries);
+
+        return 0;
+}
+
+
+int
+client_readdir_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                    struct iobuf *iobuf)
+{
+        gf_fop_readdir_rsp_t *rsp = NULL;
+        int32_t               op_ret = 0;
+        int32_t               op_errno = 0;
+        uint32_t              buf_size = 0;
+        gf_dirent_t           entries;
+
+        rsp = gf_param (hdr);
+
+        op_ret    = ntoh32 (hdr->rsp.op_ret);
+        op_errno  = ntoh32 (hdr->rsp.op_errno);
+
+        INIT_LIST_HEAD (&entries.list);
+        if (op_ret > 0) {
+                buf_size = ntoh32 (rsp->size);
+                gf_dirent_unserialize (&entries, rsp->buf, buf_size);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &entries);
+
+        gf_dirent_free (&entries);
+
+        return 0;
+}
+
+/*
+ * client_fsync_cbk - fsync callback for client protocol
+ *
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_fsync_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                  struct iobuf *iobuf)
+{
+        struct iatt         prestat = {0, };
+        struct iatt         poststat = {0,};
+        gf_fop_fsync_rsp_t *rsp = NULL;
+        int32_t             op_ret = 0;
+        int32_t             op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret == 0) {
+                gf_stat_to_iatt (&rsp->prestat, &prestat);
+                gf_stat_to_iatt (&rsp->poststat, &poststat);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &prestat, &poststat);
+
+        return 0;
+}
+
+/*
+ * client_unlink_cbk - unlink callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_unlink_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                   struct iobuf *iobuf)
+{
+        gf_fop_unlink_rsp_t *rsp = NULL;
+        int32_t              op_ret = 0;
+        int32_t              op_errno = 0;
+        struct iatt          preparent = {0,};
+        struct iatt          postparent = {0,};
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret == 0) {
+                gf_stat_to_iatt (&rsp->preparent, &preparent);
+                gf_stat_to_iatt (&rsp->postparent, &postparent);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &preparent, &postparent);
+
+        return 0;
+}
+
+/*
+ * client_rename_cbk - rename callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_rename_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                   struct iobuf *iobuf)
+{
+        struct iatt          stbuf = {0, };
+        gf_fop_rename_rsp_t *rsp = NULL;
+        int32_t              op_ret = 0;
+        int32_t              op_errno = 0;
+        struct iatt          preoldparent = {0, };
+        struct iatt          postoldparent = {0, };
+        struct iatt          prenewparent = {0, };
+        struct iatt          postnewparent = {0, };
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret == 0) {
+                gf_stat_to_iatt (&rsp->stat, &stbuf);
+                gf_stat_to_iatt (&rsp->preoldparent, &preoldparent);
+                gf_stat_to_iatt (&rsp->postoldparent, &postoldparent);
+                gf_stat_to_iatt (&rsp->prenewparent, &prenewparent);
+                gf_stat_to_iatt (&rsp->postnewparent, &postnewparent);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &stbuf, &preoldparent,
+                      &postoldparent, &prenewparent, &postnewparent);
+
+        return 0;
+}
+
+
+/*
+ * client_readlink_cbk - readlink callback for client protocol
+ *
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+int
+client_readlink_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                     struct iobuf *iobuf)
+{
+        gf_fop_readlink_rsp_t *rsp = NULL;
+        int32_t                op_ret = 0;
+        int32_t                op_errno = 0;
+        char                  *link = NULL;
+        struct iatt            stbuf = {0,};
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret > 0) {
+                link = rsp->path;
+                gf_stat_to_iatt (&rsp->buf, &stbuf);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, link, &stbuf);
+        return 0;
+}
+
+/*
+ * client_mkdir_cbk - mkdir callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_mkdir_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                  struct iobuf *iobuf)
+{
+        gf_fop_mkdir_rsp_t *rsp = NULL;
+        int32_t             op_ret = 0;
+        int32_t             op_errno = 0;
+        struct iatt         stbuf = {0, };
+        inode_t            *inode = NULL;
+        client_local_t     *local = NULL;
+        int                 ret = 0;
+        struct iatt         preparent = {0,};
+        struct iatt         postparent = {0,};
+
+        local = frame->local;
+        inode = local->loc.inode;
+        frame->local = NULL;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret >= 0) {
+                gf_stat_to_iatt (&rsp->stat, &stbuf);
+
+                ret = inode_ctx_put2 (inode, frame->this, stbuf.ia_ino,
+                                      stbuf.ia_gen);
+                if (ret < 0) {
+                        gf_log (frame->this->name, GF_LOG_DEBUG,
+                                "MKDIR %"PRId64"/%s (%s): failed to set "
+                                "remote inode number to inode ctx",
+                                local->loc.parent->ino, local->loc.name,
+                                local->loc.path);
+                        STACK_UNWIND (frame, -1, EINVAL, inode, NULL,
+                                      NULL, NULL);
+                        return 0;
+                }
+
+                gf_stat_to_iatt (&rsp->preparent, &preparent);
+                gf_stat_to_iatt (&rsp->postparent, &postparent);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, inode, &stbuf,
+                      &preparent, &postparent);
+
+        client_local_wipe (local);
+
+        return 0;
+}
+
+/*
+ * client_flush_cbk - flush callback for client protocol
+ *
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_flush_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                  struct iobuf *iobuf)
+{
+        int32_t op_ret = 0;
+        int32_t op_errno = 0;
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        STACK_UNWIND (frame, op_ret, op_errno);
+
+        return 0;
+}
+
+/*
+ * client_opendir_cbk - opendir callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_opendir_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                    struct iobuf *iobuf)
+{
+        int32_t               op_ret   = -1;
+        int32_t               op_errno = ENOTCONN;
+        fd_t                 *fd       = NULL;
+        int64_t               remote_fd = 0;
+        gf_fop_opendir_rsp_t *rsp       = NULL;
+        client_local_t       *local = NULL;
+        client_conf_t        *conf = NULL;
+        client_fd_ctx_t      *fdctx = NULL;
+        ino_t                 ino = 0;
+        uint64_t              gen = 0;
+
+
+        local = frame->local;
+
+        if (local->op) {
+                local->op (frame, hdr, hdrlen, iobuf);
+                return 0;
+        }
+
+        frame->local = NULL;
+        conf  = frame->this->private;
+        fd    = local->fd;
+
+        rsp = gf_param (hdr);
+
+        op_ret    = ntoh32 (hdr->rsp.op_ret);
+        op_errno  = ntoh32 (hdr->rsp.op_errno);
+
+        if (op_ret >= 0) {
+                remote_fd = ntoh64 (rsp->fd);
+        }
+
+        if (op_ret >= 0) {
+                fdctx = GF_CALLOC (1, sizeof (*fdctx),
+                                   gf_client_mt_client_fd_ctx_t);
+                if (!fdctx) {
+                        op_ret = -1;
+                        op_errno = ENOMEM;
+                        goto unwind_out;
+                }
+
+                inode_ctx_get2 (fd->inode, frame->this, &ino, &gen);
+
+                fdctx->remote_fd = remote_fd;
+                fdctx->inode     = inode_ref (fd->inode);
+                fdctx->ino       = ino;
+                fdctx->gen       = gen;
+
+                fdctx->is_dir    = 1;
+
+                INIT_LIST_HEAD (&fdctx->sfd_pos);
+
+                this_fd_set_ctx (fd, frame->this, &local->loc, fdctx);
+
+                pthread_mutex_lock (&conf->mutex);
+                {
+                        list_add_tail (&fdctx->sfd_pos, &conf->saved_fds);
+                }
+                pthread_mutex_unlock (&conf->mutex);
+        }
+unwind_out:
+        STACK_UNWIND (frame, op_ret, op_errno, fd);
+
+        client_local_wipe (local);
+
+        return 0;
+}
+
+/*
+ * client_rmdir_cbk - rmdir callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_rmdir_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                  struct iobuf *iobuf)
+{
+        gf_fop_rmdir_rsp_t *rsp = NULL;
+        int32_t             op_ret = 0;
+        int32_t             op_errno = 0;
+        struct iatt         preparent = {0,};
+        struct iatt         postparent = {0,};
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret == 0) {
+                gf_stat_to_iatt (&rsp->preparent, &preparent);
+                gf_stat_to_iatt (&rsp->postparent, &postparent);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &preparent, &postparent);
+
+        return 0;
+}
+
+/*
+ * client_access_cbk - access callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_access_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                   struct iobuf *iobuf)
+{
+        gf_fop_access_rsp_t *rsp = NULL;
+        int32_t              op_ret = 0;
+        int32_t              op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        STACK_UNWIND (frame, op_ret, op_errno);
+
+        return 0;
+}
+
+/*
+ * client_lookup_cbk - lookup callback for client protocol
+ *
+ * @frame: call frame
+ * @args: arguments dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_lookup_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                   struct iobuf *iobuf)
+{
+        struct iatt          stbuf = {0, };
+        struct iatt          postparent = {0, };
+        inode_t             *inode = NULL;
+        dict_t              *xattr = NULL;
+        gf_fop_lookup_rsp_t *rsp = NULL;
+        int32_t              op_ret = 0;
+        int32_t              op_errno = 0;
+        size_t               dict_len = 0;
+        char                *dictbuf = NULL;
+        int32_t              ret = -1;
+        int32_t              gf_errno = 0;
+        client_local_t      *local = NULL;
+        ino_t                oldino = 0;
+        uint64_t             oldgen = 0;
+
+        local = frame->local;
+        inode = local->loc.inode;
+        frame->local = NULL;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+
+        gf_stat_to_iatt (&rsp->postparent, &postparent);
+
+        if (op_ret == 0) {
+                op_ret = -1;
+                gf_stat_to_iatt (&rsp->stat, &stbuf);
+
+                ret = inode_ctx_get2 (inode, frame->this, &oldino, &oldgen);
+                if (oldino != stbuf.ia_ino || oldgen != stbuf.ia_gen) {
+                        if (oldino) {
+                                gf_log (frame->this->name, GF_LOG_DEBUG,
+                                        "LOOKUP %"PRId64"/%s (%s): "
+                                        "inode number changed from "
+                                        "{%"PRId64",%"PRId64"} to {%"PRId64",%"PRId64"}",
+                                        local->loc.parent ?
+                                        local->loc.parent->ino : (uint64_t) 0,
+                                        local->loc.name,
+                                        local->loc.path,
+                                        oldgen, oldino, stbuf.ia_gen, stbuf.ia_ino);
+                                op_errno = ESTALE;
+                                goto fail;
+                        }
+
+                        ret = inode_ctx_put2 (inode, frame->this,
+                                              stbuf.ia_ino, stbuf.ia_gen);
+                        if (ret < 0) {
+                                gf_log (frame->this->name, GF_LOG_DEBUG,
+                                        "LOOKUP %"PRId64"/%s (%s) : "
+                                        "failed to set remote inode "
+                                        "number to inode ctx",
+                                        local->loc.parent ?
+                                        local->loc.parent->ino : (uint64_t) 0,
+                                        local->loc.name,
+                                        local->loc.path);
+                                op_errno = EINVAL;
+                                goto fail;
+                        }
+                }
+
+                dict_len = ntoh32 (rsp->dict_len);
+
+                if (dict_len > 0) {
+                        dictbuf = memdup (rsp->dict, dict_len);
+                        GF_VALIDATE_OR_GOTO (frame->this->name, dictbuf, fail);
+
+                        xattr = dict_new();
+                        GF_VALIDATE_OR_GOTO (frame->this->name, xattr, fail);
+
+                        ret = dict_unserialize (dictbuf, dict_len, &xattr);
+                        if (ret < 0) {
+                                gf_log (frame->this->name, GF_LOG_DEBUG,
+                                        "%s (%"PRId64"): failed to "
+                                        "unserialize dictionary",
+                                        local->loc.path, inode->ino);
+                                goto fail;
+                        } else {
+                                xattr->extra_free = dictbuf;
+                                dictbuf = NULL;
+                        }
+                }
+                op_ret = 0;
+        }
+        gf_errno = ntoh32 (hdr->rsp.op_errno);
+        op_errno = gf_error_to_errno (gf_errno);
+
+fail:
+        STACK_UNWIND (frame, op_ret, op_errno, inode, &stbuf, xattr,
+                      &postparent);
+
+        client_local_wipe (local);
+
+        if (dictbuf)
+                GF_FREE (dictbuf);
+
+        if (xattr)
+                dict_unref (xattr);
+
+        return 0;
+}
+
+static int32_t
+client_setattr_cbk (call_frame_t *frame,gf_hdr_common_t *hdr, size_t hdrlen,
+                    struct iobuf *iobuf)
+{
+        struct iatt           statpre = {0, };
+        struct iatt           statpost = {0, };
+        gf_fop_setattr_rsp_t *rsp = NULL;
+        int32_t               op_ret = 0;
+        int32_t               op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret == 0) {
+                gf_stat_to_iatt (&rsp->statpre, &statpre);
+                gf_stat_to_iatt (&rsp->statpost, &statpost);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &statpre, &statpost);
+
+        return 0;
+}
+
+static int32_t
+client_fsetattr_cbk (call_frame_t *frame,gf_hdr_common_t *hdr, size_t hdrlen,
+                     struct iobuf *iobuf)
+{
+        struct iatt           statpre = {0, };
+        struct iatt           statpost = {0, };
+        gf_fop_setattr_rsp_t *rsp = NULL;
+        int32_t               op_ret = 0;
+        int32_t               op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret == 0) {
+                gf_stat_to_iatt (&rsp->statpre, &statpre);
+                gf_stat_to_iatt (&rsp->statpost, &statpost);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &statpre, &statpost);
+
+        return 0;
+}
+
+
+int
+gf_free_direntry (dir_entry_t *head)
+{
+        dir_entry_t *prev = NULL;
+        dir_entry_t *trav = NULL;
+
+        prev = head;
+        GF_VALIDATE_OR_GOTO ("client-protocol", prev, fail);
+
+        trav = head->next;
+        while (trav) {
+                prev->next = trav->next;
+                GF_FREE (trav->name);
+                if (IA_ISLNK (trav->buf.ia_type))
+                        GF_FREE (trav->link);
+                GF_FREE (trav);
+                trav = prev->next;
+        }
+        GF_FREE (head);
+fail:
+        return 0;
+}
+
+/*
+ * client_statfs_cbk - statfs callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_statfs_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                   struct iobuf *iobuf)
+{
+        struct statvfs       stbuf = {0, };
+        gf_fop_statfs_rsp_t *rsp = NULL;
+        int32_t              op_ret = 0;
+        int32_t              op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret == 0) {
+                gf_statfs_to_statfs (&rsp->statfs, &stbuf);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &stbuf);
+
+        return 0;
+}
+
+/*
+ * client_fsyncdir_cbk - fsyncdir callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_fsyncdir_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                     struct iobuf *iobuf)
+{
+        int32_t op_ret = 0;
+        int32_t op_errno = 0;
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        STACK_UNWIND (frame, op_ret, op_errno);
+
+        return 0;
+}
+
+/*
+ * client_setxattr_cbk - setxattr callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_setxattr_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                     struct iobuf *iobuf)
+{
+        gf_fop_setxattr_rsp_t *rsp = NULL;
+        int32_t                op_ret = 0;
+        int32_t                op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        STACK_UNWIND (frame, op_ret, op_errno);
+
+        return 0;
+}
+
+/*
+ * client_getxattr_cbk - getxattr callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_getxattr_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                     struct iobuf *iobuf)
+{
+        gf_fop_getxattr_rsp_t *rsp = NULL;
+        int32_t                op_ret   = 0;
+        int32_t                gf_errno = 0;
+        int32_t                op_errno = 0;
+        int32_t                dict_len = 0;
+        dict_t                *dict = NULL;
+        int32_t                ret = -1;
+        char                  *dictbuf = NULL;
+        client_local_t        *local = NULL;
+
+        local = frame->local;
+        frame->local = NULL;
+
+        rsp = gf_param (hdr);
+        GF_VALIDATE_OR_GOTO (frame->this->name, rsp, fail);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+
+        if (op_ret >= 0) {
+                op_ret = -1;
+                dict_len = ntoh32 (rsp->dict_len);
+
+                if (dict_len > 0) {
+                        dictbuf = memdup (rsp->dict, dict_len);
+                        GF_VALIDATE_OR_GOTO (frame->this->name, dictbuf, fail);
+
+                        dict = dict_new();
+                        GF_VALIDATE_OR_GOTO (frame->this->name, dict, fail);
+
+                        ret = dict_unserialize (dictbuf, dict_len, &dict);
+                        if (ret < 0) {
+                                gf_log (frame->this->name, GF_LOG_DEBUG,
+                                        "%s (%"PRId64"): failed to "
+                                        "unserialize xattr dictionary",
+                                        local->loc.path,
+                                        local->loc.inode->ino);
+                                goto fail;
+                        } else {
+                                dict->extra_free = dictbuf;
+                                dictbuf = NULL;
+                        }
+                }
+                op_ret = 0;
+        }
+        gf_errno = ntoh32 (hdr->rsp.op_errno);
+        op_errno = gf_error_to_errno (gf_errno);
+fail:
+        STACK_UNWIND (frame, op_ret, op_errno, dict);
+
+        client_local_wipe (local);
+
+        if (dictbuf)
+                GF_FREE (dictbuf);
+
+        if (dict)
+                dict_unref (dict);
+
+        return 0;
+}
+
+/*
+ * client_removexattr_cbk - removexattr callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_removexattr_cbk (call_frame_t *frame, gf_hdr_common_t *hdr,
+                        size_t hdrlen, struct iobuf *iobuf)
+{
+        int32_t op_ret = 0;
+        int32_t op_errno = 0;
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        STACK_UNWIND (frame, op_ret, op_errno);
+
+        return 0;
+}
+
+/*
+ * client_lk_cbk - lk callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_lk_common_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                      struct iobuf *iobuf)
+{
+        struct flock     lock = {0,};
+        gf_fop_lk_rsp_t *rsp = NULL;
+        int32_t          op_ret = 0;
+        int32_t          op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret >= 0) {
+                gf_flock_to_flock (&rsp->flock, &lock);
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, &lock);
+        return 0;
+}
+
+/*
+ * client_gf_file_lk_cbk - gf_file_lk callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_inodelk_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                    struct iobuf *iobuf)
+{
+        gf_fop_inodelk_rsp_t *rsp = NULL;
+        int32_t               op_ret = 0;
+        int32_t               op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        STACK_UNWIND (frame, op_ret, op_errno);
+        return 0;
+}
+
+
+int
+client_finodelk_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                     struct iobuf *iobuf)
+{
+        gf_fop_finodelk_rsp_t *rsp = NULL;
+        int32_t                op_ret = 0;
+        int32_t                op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        STACK_UNWIND (frame, op_ret, op_errno);
+        return 0;
+}
+
+/*
+ * client_entrylk_cbk - entrylk callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_entrylk_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                    struct iobuf *iobuf)
+{
+        gf_fop_entrylk_rsp_t *rsp = NULL;
+        int32_t               op_ret = 0;
+        int32_t               op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        STACK_UNWIND (frame, op_ret, op_errno);
+        return 0;
+}
+
+int
+client_fentrylk_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                     struct iobuf *iobuf)
+{
+        gf_fop_fentrylk_rsp_t *rsp = NULL;
+        int32_t                op_ret = 0;
+        int32_t                op_errno = 0;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        STACK_UNWIND (frame, op_ret, op_errno);
+        return 0;
+}
+
+
+
+/*
+ * client_getspec - getspec function for client protocol
+ * @frame: call frame
+ * @this: client protocol xlator structure
+ * @flag:
+ *
+ * external reference through client_protocol_xlator->fops->getspec
+ */
+
+int
+client_getspec (call_frame_t *frame, xlator_t *this, const char *key,
+                int32_t flag)
+{
+        gf_hdr_common_t      *hdr = NULL;
+        gf_mop_getspec_req_t *req = NULL;
+        size_t                hdrlen = -1;
+        int                   keylen = 0;
+        int                   ret = -1;
+
+        if (key)
+                keylen = STRLEN_0 (key);
+
+        hdrlen = gf_hdr_len (req, keylen);
+        hdr    = gf_hdr_new (req, keylen);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, unwind);
+
+        req        = gf_param (hdr);
+        req->flags = hton32 (flag);
+        req->keylen = hton32 (keylen);
+        if (keylen)
+                strcpy (req->key, key);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_MOP_REQUEST, GF_MOP_GETSPEC,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+unwind:
+        if (hdr)
+                GF_FREE (hdr);
+        STACK_UNWIND (frame, -1, EINVAL, NULL);
+        return 0;
+}
+
+/*
+ * client_getspec_cbk - getspec callback for client protocol
+ *
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_getspec_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                    struct iobuf *iobuf)
+{
+        gf_mop_getspec_rsp_t  *rsp = NULL;
+        char                  *spec_data = NULL;
+        int32_t                op_ret = 0;
+        int32_t                op_errno = 0;
+        int32_t                gf_errno = 0;
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        gf_errno = ntoh32 (hdr->rsp.op_errno);
+        op_errno = gf_error_to_errno (gf_errno);
+        rsp = gf_param (hdr);
+
+        if (op_ret >= 0) {
+                spec_data = rsp->spec;
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, spec_data);
+        return 0;
+}
+
+int
+client_checksum (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flag)
+{
+        gf_hdr_common_t       *hdr = NULL;
+        gf_fop_checksum_req_t *req = NULL;
+        size_t                 hdrlen = -1;
+        int                    ret = -1;
+        ino_t                  ino = 0;
+        uint64_t               gen = 0;
+
+        hdrlen = gf_hdr_len (req, strlen (loc->path) + 1);
+        hdr    = gf_hdr_new (req, strlen (loc->path) + 1);
+        req    = gf_param (hdr);
+
+        ret = inode_ctx_get2 (loc->inode, this, &ino, &gen);
+        if (loc->inode->ino && ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "CHECKSUM %"PRId64" (%s): "
+                        "failed to get remote inode number",
+                        loc->inode->ino, loc->path);
+                STACK_UNWIND (frame, -1, EINVAL, NULL, NULL);
+                return 0;
+
+        }
+
+        req->ino  = hton64 (ino);
+        req->gen  = hton64 (gen);
+        req->flag = hton32 (flag);
+        strcpy (req->path, loc->path);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_CHECKSUM,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+}
+
+
+int
+client_checksum_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                     struct iobuf *iobuf)
+{
+        gf_fop_checksum_rsp_t *rsp = NULL;
+        int32_t                op_ret = 0;
+        int32_t                op_errno = 0;
+        int32_t                gf_errno = 0;
+        unsigned char         *fchecksum = NULL;
+        unsigned char         *dchecksum = NULL;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        gf_errno = ntoh32 (hdr->rsp.op_errno);
+        op_errno = gf_error_to_errno (gf_errno);
+
+        if (op_ret >= 0) {
+                fchecksum = rsp->fchecksum;
+                dchecksum = rsp->dchecksum + NAME_MAX;
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, fchecksum, dchecksum);
+        return 0;
+}
+
+
+int
+client_rchecksum (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+                  int32_t len)
+{
+        gf_hdr_common_t        *hdr = NULL;
+        gf_fop_rchecksum_req_t *req = NULL;
+        size_t                  hdrlen = -1;
+        int                     ret = -1;
+
+        int64_t                remote_fd = -1;
+        client_fd_ctx_t       *fdctx     = NULL;
+        client_conf_t         *conf = NULL;
+
+        hdrlen = gf_hdr_len (req, 0);
+        hdr    = gf_hdr_new (req, 0);
+        req    = gf_param (hdr);
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx = this_fd_get_ctx (fd, this);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx == NULL) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, 0, NULL);
+                return 0;
+        }
+
+        if (fdctx->remote_fd == -1) {
+                gf_log (this->name, GF_LOG_TRACE,
+                        "(%"PRId64"): failed to get fd ctx. EBADFD",
+                        fd->inode->ino);
+                STACK_UNWIND (frame, -1, EBADFD, 0, NULL);
+                return 0;
+        }
+
+        remote_fd = fdctx->remote_fd;
+
+        req->fd     = hton64 (remote_fd);
+        req->offset = hton64 (offset);
+        req->len    = hton32 (len);
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_BULK),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_RCHECKSUM,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+}
+
+
+int
+client_rchecksum_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                      struct iobuf *iobuf)
+{
+        gf_fop_rchecksum_rsp_t *rsp = NULL;
+
+        int32_t                op_ret = 0;
+        int32_t                op_errno = 0;
+        int32_t                gf_errno = 0;
+        uint32_t               weak_checksum = 0;
+        unsigned char         *strong_checksum = NULL;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        gf_errno = ntoh32 (hdr->rsp.op_errno);
+        op_errno = gf_error_to_errno (gf_errno);
+
+        if (op_ret >= 0) {
+                weak_checksum   = rsp->weak_checksum;
+                strong_checksum = rsp->strong_checksum;
+        }
+
+        STACK_UNWIND (frame, op_ret, op_errno, weak_checksum, strong_checksum);
+
+        return 0;
+}
+
+
+/*
+ * client_setspec_cbk - setspec callback for client protocol
+ * @frame: call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_setspec_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                    struct iobuf *iobuf)
+{
+        int32_t op_ret = 0;
+        int32_t op_errno = 0;
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        STACK_UNWIND (frame, op_ret, op_errno);
+
+        return 0;
+}
+
+
+
+int
+protocol_client_reopendir_cbk (call_frame_t *frame, gf_hdr_common_t *hdr,
+                               size_t hdrlen, struct iobuf *iobuf)
+{
+        int32_t              op_ret = -1;
+        int32_t              op_errno = ENOTCONN;
+        int64_t              remote_fd = -1;
+        gf_fop_open_rsp_t   *rsp = NULL;
+        client_local_t      *local = NULL;
+        client_conf_t       *conf = NULL;
+        client_fd_ctx_t     *fdctx = NULL;
+
+
+        local = frame->local; frame->local = NULL;
+        conf  = frame->this->private;
+        fdctx = local->fdctx;
+
+        rsp = gf_param (hdr);
+
+        op_ret    = ntoh32 (hdr->rsp.op_ret);
+        op_errno  = ntoh32 (hdr->rsp.op_errno);
+
+        if (op_ret >= 0)
+                remote_fd = ntoh64 (rsp->fd);
+
+        gf_log (frame->this->name, GF_LOG_DEBUG,
+                "reopendir on %s returned %d (%"PRId64")",
+                local->loc.path, op_ret, remote_fd);
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx->remote_fd = remote_fd;
+
+                if (!fdctx->released) {
+                        list_add_tail (&fdctx->sfd_pos, &conf->saved_fds);
+                        fdctx = NULL;
+                }
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx)
+                client_fdctx_destroy (frame->this, fdctx);
+
+        STACK_DESTROY (frame->root);
+
+        client_local_wipe (local);
+
+        return 0;
+}
+
+
+
+int
+protocol_client_reopendir (xlator_t *this, client_fd_ctx_t *fdctx)
+{
+        int                    ret = -1;
+        gf_hdr_common_t       *hdr = NULL;
+        size_t                 hdrlen = 0;
+        gf_fop_opendir_req_t  *req = NULL;
+        size_t                 pathlen = 0;
+        client_local_t        *local = NULL;
+        inode_t               *inode = NULL;
+        char                  *path = NULL;
+        call_frame_t          *frame = NULL;
+
+        inode = fdctx->inode;
+
+        ret = inode_path (inode, NULL, &path);
+        if (ret < 0) {
+                goto out;
+        }
+
+        local = GF_CALLOC (1, sizeof (*local), gf_client_mt_client_local_t);
+        if (!local) {
+                goto out;
+        }
+
+        local->fdctx = fdctx;
+        local->op = protocol_client_reopendir_cbk;
+        local->loc.path = path; path = NULL;
+
+        frame = create_frame (this, this->ctx->pool);
+        if (!frame) {
+                goto out;
+        }
+
+        pathlen = STRLEN_0 (local->loc.path);
+
+        hdrlen = gf_hdr_len (req, pathlen);
+        hdr    = gf_hdr_new (req, pathlen);
+
+        req    = gf_param (hdr);
+
+        req->ino   = hton64 (fdctx->ino);
+        req->gen   = hton64 (fdctx->gen);
+
+        strcpy (req->path, local->loc.path);
+
+        gf_log (frame->this->name, GF_LOG_DEBUG,
+                "attempting reopendir on %s", local->loc.path);
+
+        frame->local = local; local = NULL;
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_OPENDIR,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+
+out:
+        if (frame)
+                STACK_DESTROY (frame->root);
+
+        if (local)
+                client_local_wipe (local);
+
+        if (path)
+                GF_FREE (path);
+
+        return 0;
+}
+
+
+int
+protocol_client_reopen_cbk (call_frame_t *frame, gf_hdr_common_t *hdr,
+                            size_t hdrlen, struct iobuf *iobuf)
+{
+        int32_t              op_ret = -1;
+        int32_t              op_errno = ENOTCONN;
+        int64_t              remote_fd = -1;
+        gf_fop_open_rsp_t   *rsp = NULL;
+        client_local_t      *local = NULL;
+        client_conf_t       *conf = NULL;
+        client_fd_ctx_t     *fdctx = NULL;
+
+
+        local = frame->local; frame->local = NULL;
+        conf  = frame->this->private;
+        fdctx = local->fdctx;
+
+        rsp = gf_param (hdr);
+
+        op_ret    = ntoh32 (hdr->rsp.op_ret);
+        op_errno  = ntoh32 (hdr->rsp.op_errno);
+
+        if (op_ret >= 0)
+                remote_fd = ntoh64 (rsp->fd);
+
+        gf_log (frame->this->name, GF_LOG_DEBUG,
+                "reopen on %s returned %d (%"PRId64")",
+                local->loc.path, op_ret, remote_fd);
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                fdctx->remote_fd = remote_fd;
+
+                if (!fdctx->released) {
+                        list_add_tail (&fdctx->sfd_pos, &conf->saved_fds);
+                        fdctx = NULL;
+                }
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        if (fdctx)
+                client_fdctx_destroy (frame->this, fdctx);
+
+        STACK_DESTROY (frame->root);
+
+        client_local_wipe (local);
+
+        return 0;
+}
+
+
+int
+protocol_client_reopen (xlator_t *this, client_fd_ctx_t *fdctx)
+{
+        int                 ret = -1;
+        gf_hdr_common_t    *hdr = NULL;
+        size_t              hdrlen = 0;
+        gf_fop_open_req_t  *req = NULL;
+        size_t              pathlen = 0;
+        client_local_t     *local = NULL;
+        inode_t            *inode = NULL;
+        char               *path = NULL;
+        call_frame_t       *frame = NULL;
+
+        inode = fdctx->inode;
+
+        ret = inode_path (inode, NULL, &path);
+        if (ret < 0) {
+                goto out;
+        }
+
+        local = GF_CALLOC (1, sizeof (*local), gf_client_mt_client_local_t);
+        if (!local) {
+                goto out;
+        }
+
+        local->fdctx = fdctx;
+        local->op = protocol_client_reopen_cbk;
+        local->loc.path = path; path = NULL;
+
+        frame = create_frame (this, this->ctx->pool);
+        if (!frame) {
+                goto out;
+        }
+
+        pathlen = STRLEN_0 (local->loc.path);
+
+        hdrlen = gf_hdr_len (req, pathlen);
+        hdr    = gf_hdr_new (req, pathlen);
+
+        req    = gf_param (hdr);
+
+        req->ino   = hton64 (fdctx->ino);
+        req->gen   = hton64 (fdctx->gen);
+        req->flags = hton32 (gf_flags_from_flags (fdctx->flags));
+        req->wbflags = hton32 (fdctx->wbflags);
+        strcpy (req->path, local->loc.path);
+
+        gf_log (frame->this->name, GF_LOG_DEBUG,
+                "attempting reopen on %s", local->loc.path);
+
+        frame->local = local; local = NULL;
+
+        ret = protocol_client_xfer (frame, this,
+                                    CLIENT_CHANNEL (this, CHANNEL_LOWLAT),
+                                    GF_OP_TYPE_FOP_REQUEST, GF_PROTO_FOP_OPEN,
+                                    hdr, hdrlen, NULL, 0, NULL);
+
+        return ret;
+
+out:
+        if (frame)
+                STACK_DESTROY (frame->root);
+
+        if (local)
+                client_local_wipe (local);
+
+        if (path)
+                GF_FREE (path);
+
+        return 0;
+
+}
+
+
+int
+protocol_client_post_handshake (call_frame_t *frame, xlator_t *this)
+{
+        client_conf_t            *conf = NULL;
+        client_fd_ctx_t          *tmp = NULL;
+        client_fd_ctx_t          *fdctx = NULL;
+        xlator_list_t            *parent = NULL;
+        struct list_head          reopen_head;
+
+        conf = this->private;
+        INIT_LIST_HEAD (&reopen_head);
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                list_for_each_entry_safe (fdctx, tmp, &conf->saved_fds,
+                                          sfd_pos) {
+                        if (fdctx->remote_fd != -1)
+                                continue;
+
+                        list_del (&fdctx->sfd_pos);
+                        list_add_tail (&fdctx->sfd_pos, &reopen_head);
+                }
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        list_for_each_entry_safe (fdctx, tmp, &reopen_head, sfd_pos) {
+                list_del_init (&fdctx->sfd_pos);
+
+                if (fdctx->is_dir)
+                        protocol_client_reopendir (this, fdctx);
+                else
+                        protocol_client_reopen (this, fdctx);
+        }
+
+        parent = this->parents;
+
+        while (parent) {
+                xlator_notify (parent->xlator, GF_EVENT_CHILD_UP,
+                               this);
+                parent = parent->next;
+        }
+
+        return 0;
+}
+
+/*
+ * client_setvolume_cbk - setvolume callback for client protocol
+ * @frame:  call frame
+ * @args: argument dictionary
+ *
+ * not for external reference
+ */
+
+int
+client_setvolume_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                      struct iobuf *iobuf)
+{
+        client_conf_t          *conf = NULL;
+        gf_mop_setvolume_rsp_t *rsp = NULL;
+        client_connection_t    *conn = NULL;
+        glusterfs_ctx_t        *ctx = NULL;
+        xlator_t               *this = NULL;
+        xlator_list_t          *parent = NULL;
+        transport_t            *trans = NULL;
+        dict_t                 *reply = NULL;
+        char                   *remote_subvol = NULL;
+        char                   *remote_error = NULL;
+        char                   *process_uuid = NULL;
+        int32_t                 ret = -1;
+        int32_t                 op_ret   = -1;
+        int32_t                 op_errno = EINVAL;
+        int32_t                 dict_len = 0;
+        transport_t            *peer_trans = NULL;
+        uint64_t                peer_trans_int = 0;
+
+        trans = frame->local; frame->local = NULL;
+        this  = frame->this;
+        conn  = trans->xl_private;
+        conf  = this->private;
+
+        rsp = gf_param (hdr);
+
+        op_ret   = ntoh32 (hdr->rsp.op_ret);
+        op_errno = gf_error_to_errno (ntoh32 (hdr->rsp.op_errno));
+
+        if (op_ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "setvolume failed (%s)",
+                        strerror (op_errno));
+                goto out;
+        }
+
+        reply = dict_new ();
+        GF_VALIDATE_OR_GOTO (this->name, reply, out);
+
+        dict_len = ntoh32 (rsp->dict_len);
+        ret = dict_unserialize (rsp->buf, dict_len, &reply);
+        if (ret < 0) {
+                gf_log (frame->this->name, GF_LOG_DEBUG,
+                        "failed to unserialize buffer(%p) to dictionary",
+                        rsp->buf);
+                goto out;
+        }
+
+        ret = dict_get_str (reply, "ERROR", &remote_error);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to get ERROR string from reply dictionary");
+        }
+
+        ret = dict_get_str (reply, "process-uuid", &process_uuid);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to get 'process-uuid' from reply dictionary");
+        }
+
+        if (op_ret < 0) {
+                gf_log (trans->xl->name, GF_LOG_ERROR,
+                        "SETVOLUME on remote-host failed: %s",
+                        remote_error ? remote_error : strerror (op_errno));
+                errno = op_errno;
+                if (op_errno == ESTALE) {
+                        parent = trans->xl->parents;
+                        while (parent) {
+                                xlator_notify (parent->xlator,
+                                               GF_EVENT_VOLFILE_MODIFIED,
+                                               trans->xl);
+                                parent = parent->next;
+                        }
+                }
+
+        } else {
+                ret = dict_get_str (this->options, "remote-subvolume",
+                                    &remote_subvol);
+                if (!remote_subvol)
+                        goto out;
+
+                ctx = this->ctx;
+
+                if (process_uuid && !strcmp (ctx->process_uuid,process_uuid)) {
+                        ret = dict_get_uint64 (reply, "transport-ptr",
+                                               &peer_trans_int);
+
+                        peer_trans = (void *) (long) (peer_trans_int);
+
+                        gf_log (this->name, GF_LOG_WARNING,
+                                "attaching to the local volume '%s'",
+                                remote_subvol);
+
+                        transport_setpeer (trans, peer_trans);
+
+                }
+
+                gf_log (trans->xl->name, GF_LOG_NORMAL,
+                        "Connected to %s, attached "
+                        "to remote volume '%s'.",
+                        trans->peerinfo.identifier, remote_subvol);
+
+                pthread_mutex_lock (&(conn->lock));
+                {
+                        conn->connected = 1;
+                }
+                pthread_mutex_unlock (&(conn->lock));
+
+                protocol_client_post_handshake (frame, frame->this);
+        }
+
+        conf->connecting = 0;
+out:
+
+        if (-1 == op_ret) {
+                /* Let the connection/re-connection happen in
+                 * background, for now, don't hang here,
+                 * tell the parents that i am all ok..
+                 */
+                parent = trans->xl->parents;
+                while (parent) {
+                        xlator_notify (parent->xlator,
+                                       GF_EVENT_CHILD_CONNECTING, trans->xl);
+                        parent = parent->next;
+                }
+                conf->connecting= 1;
+        }
+
+        STACK_DESTROY (frame->root);
+
+        if (reply)
+                dict_unref (reply);
+
+        return op_ret;
+}
+
+/*
+ * client_enosys_cbk -
+ * @frame: call frame
+ *
+ * not for external reference
+ */
+
+int
+client_enosys_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                   struct iobuf *iobuf)
+{
+        STACK_DESTROY (frame->root);
+        return 0;
+}
+
+
+void
+client_protocol_reconnect (void *trans_ptr)
+{
+        transport_t         *trans = NULL;
+        client_connection_t *conn = NULL;
+        struct timeval       tv = {0, 0};
+        int32_t              ret = 0;
+
+        trans = trans_ptr;
+        conn  = trans->xl_private;
+        pthread_mutex_lock (&conn->lock);
+        {
+                if (conn->reconnect)
+                        gf_timer_call_cancel (trans->xl->ctx,
+                                              conn->reconnect);
+                conn->reconnect = 0;
+
+                if (conn->connected == 0) {
+                        tv.tv_sec = 10;
+
+                        gf_log (trans->xl->name, GF_LOG_TRACE,
+                                "attempting reconnect");
+                        ret = transport_connect (trans);
+
+                        conn->reconnect =
+                                gf_timer_call_after (trans->xl->ctx, tv,
+                                                     client_protocol_reconnect,
+                                                     trans);
+                } else {
+                        gf_log (trans->xl->name, GF_LOG_TRACE,
+                                "breaking reconnect chain");
+                }
+        }
+        pthread_mutex_unlock (&conn->lock);
+
+        if (ret == -1 && errno != EINPROGRESS) {
+                default_notify (trans->xl, GF_EVENT_CHILD_DOWN, NULL);
+        }
+}
+
+int
+protocol_client_mark_fd_bad (xlator_t *this)
+{
+        client_conf_t            *conf = NULL;
+        client_fd_ctx_t          *tmp = NULL;
+        client_fd_ctx_t          *fdctx = NULL;
+
+        conf = this->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                list_for_each_entry_safe (fdctx, tmp, &conf->saved_fds,
+                                          sfd_pos) {
+                        fdctx->remote_fd = -1;
+                }
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        return 0;
+}
+
+/*
+ * client_protocol_cleanup - cleanup function
+ * @trans: transport object
+ *
+ */
+
+int
+protocol_client_cleanup (transport_t *trans)
+{
+        client_connection_t    *conn = NULL;
+        struct saved_frames    *saved_frames = NULL;
+
+        conn = trans->xl_private;
+
+        gf_log (trans->xl->name, GF_LOG_TRACE,
+                "cleaning up state in transport object %p", trans);
+
+        pthread_mutex_lock (&conn->lock);
+        {
+                saved_frames = conn->saved_frames;
+                conn->saved_frames = saved_frames_new ();
+
+                /* bailout logic cleanup */
+                if (conn->timer) {
+                        gf_timer_call_cancel (trans->xl->ctx, conn->timer);
+                        conn->timer = NULL;
+                }
+
+                if (conn->reconnect == NULL) {
+                        /* :O This part is empty.. any thing missing? */
+                }
+        }
+        pthread_mutex_unlock (&conn->lock);
+
+        saved_frames_destroy (trans->xl, saved_frames,
+                              gf_fops, gf_mops, gf_cbks);
+
+        return 0;
+}
+
+
+/* cbk callbacks */
+int
+client_releasedir_cbk (call_frame_t *frame, gf_hdr_common_t *hdr,
+                       size_t hdrlen, struct iobuf *iobuf)
+{
+        STACK_DESTROY (frame->root);
+        return 0;
+}
+
+
+int
+client_release_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                    struct iobuf *iobuf)
+{
+        STACK_DESTROY (frame->root);
+        return 0;
+}
+
+
+int
+client_forget_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                   struct iobuf *iobuf)
+{
+        gf_log ("", GF_LOG_CRITICAL, "fop not implemented");
+        return 0;
+}
+
+
+int
+client_log_cbk (call_frame_t *frame, gf_hdr_common_t *hdr, size_t hdrlen,
+                struct iobuf *iobuf)
+{
+        gf_log ("", GF_LOG_CRITICAL, "fop not implemented");
+        return 0;
+}
+
+
+static gf_op_t gf_fops[] = {
+        [GF_PROTO_FOP_STAT]           =  client_stat_cbk,
+        [GF_PROTO_FOP_READLINK]       =  client_readlink_cbk,
+        [GF_PROTO_FOP_MKNOD]          =  client_mknod_cbk,
+        [GF_PROTO_FOP_MKDIR]          =  client_mkdir_cbk,
+        [GF_PROTO_FOP_UNLINK]         =  client_unlink_cbk,
+        [GF_PROTO_FOP_RMDIR]          =  client_rmdir_cbk,
+        [GF_PROTO_FOP_SYMLINK]        =  client_symlink_cbk,
+        [GF_PROTO_FOP_RENAME]         =  client_rename_cbk,
+        [GF_PROTO_FOP_LINK]           =  client_link_cbk,
+        [GF_PROTO_FOP_TRUNCATE]       =  client_truncate_cbk,
+        [GF_PROTO_FOP_OPEN]           =  client_open_cbk,
+        [GF_PROTO_FOP_READ]           =  client_readv_cbk,
+        [GF_PROTO_FOP_WRITE]          =  client_write_cbk,
+        [GF_PROTO_FOP_STATFS]         =  client_statfs_cbk,
+        [GF_PROTO_FOP_FLUSH]          =  client_flush_cbk,
+        [GF_PROTO_FOP_FSYNC]          =  client_fsync_cbk,
+        [GF_PROTO_FOP_SETXATTR]       =  client_setxattr_cbk,
+        [GF_PROTO_FOP_GETXATTR]       =  client_getxattr_cbk,
+        [GF_PROTO_FOP_REMOVEXATTR]    =  client_removexattr_cbk,
+        [GF_PROTO_FOP_OPENDIR]        =  client_opendir_cbk,
+        [GF_PROTO_FOP_FSYNCDIR]       =  client_fsyncdir_cbk,
+        [GF_PROTO_FOP_ACCESS]         =  client_access_cbk,
+        [GF_PROTO_FOP_CREATE]         =  client_create_cbk,
+        [GF_PROTO_FOP_FTRUNCATE]      =  client_ftruncate_cbk,
+        [GF_PROTO_FOP_FSTAT]          =  client_fstat_cbk,
+        [GF_PROTO_FOP_LK]             =  client_lk_common_cbk,
+        [GF_PROTO_FOP_LOOKUP]         =  client_lookup_cbk,
+        [GF_PROTO_FOP_READDIR]        =  client_readdir_cbk,
+        [GF_PROTO_FOP_READDIRP]       =  client_readdirp_cbk,
+        [GF_PROTO_FOP_INODELK]        =  client_inodelk_cbk,
+        [GF_PROTO_FOP_FINODELK]       =  client_finodelk_cbk,
+        [GF_PROTO_FOP_ENTRYLK]        =  client_entrylk_cbk,
+        [GF_PROTO_FOP_FENTRYLK]       =  client_fentrylk_cbk,
+        [GF_PROTO_FOP_CHECKSUM]       =  client_checksum_cbk,
+        [GF_PROTO_FOP_RCHECKSUM]      =  client_rchecksum_cbk,
+        [GF_PROTO_FOP_XATTROP]        =  client_xattrop_cbk,
+        [GF_PROTO_FOP_FXATTROP]       =  client_fxattrop_cbk,
+        [GF_PROTO_FOP_SETATTR]        =  client_setattr_cbk,
+        [GF_PROTO_FOP_FSETATTR]       =  client_fsetattr_cbk
+};
+
+static gf_op_t gf_mops[] = {
+        [GF_MOP_SETVOLUME]        =  client_setvolume_cbk,
+        [GF_MOP_GETVOLUME]        =  client_enosys_cbk,
+        [GF_MOP_SETSPEC]          =  client_setspec_cbk,
+        [GF_MOP_GETSPEC]          =  client_getspec_cbk,
+        [GF_MOP_PING]             =  client_ping_cbk,
+        [GF_MOP_LOG]              =  client_log_cbk
+};
+
+static gf_op_t gf_cbks[] = {
+        [GF_CBK_FORGET]           = client_forget_cbk,
+        [GF_CBK_RELEASE]          = client_release_cbk,
+        [GF_CBK_RELEASEDIR]       = client_releasedir_cbk
+};
+
+/*
+ * client_protocol_interpret - protocol interpreter
+ * @trans: transport object
+ * @blk: data block
+ *
+ */
+int
+protocol_client_interpret (xlator_t *this, transport_t *trans,
+                           char *hdr_p, size_t hdrlen, struct iobuf *iobuf)
+{
+        int                  ret = -1;
+        call_frame_t        *frame = NULL;
+        gf_hdr_common_t     *hdr = NULL;
+        uint64_t             callid = 0;
+        int                  type = -1;
+        int                  op = -1;
+        client_connection_t *conn = NULL;
+
+        conn  = trans->xl_private;
+
+        hdr  = (gf_hdr_common_t *)hdr_p;
+
+        type   = ntoh32 (hdr->type);
+        op     = ntoh32 (hdr->op);
+        callid = ntoh64 (hdr->callid);
+
+        frame  = lookup_frame (trans, op, type, callid);
+        if (frame == NULL) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "no frame for callid=%"PRId64" type=%d op=%d",
+                        callid, type, op);
+                return 0;
+        }
+
+        switch (type) {
+        case GF_OP_TYPE_FOP_REPLY:
+                if ((op > GF_PROTO_FOP_MAXVALUE) ||
+                    (op < 0)) {
+                        gf_log (trans->xl->name, GF_LOG_WARNING,
+                                "invalid fop '%d'", op);
+                } else {
+                        ret = gf_fops[op] (frame, hdr, hdrlen, iobuf);
+                }
+                break;
+        case GF_OP_TYPE_MOP_REPLY:
+                if ((op > GF_MOP_MAXVALUE) ||
+                    (op < 0)) {
+                        gf_log (trans->xl->name, GF_LOG_WARNING,
+                                "invalid fop '%d'", op);
+                } else {
+                        ret = gf_mops[op] (frame, hdr, hdrlen, iobuf);
+                }
+                break;
+        case GF_OP_TYPE_CBK_REPLY:
+                if ((op > GF_CBK_MAXVALUE) ||
+                    (op < 0)) {
+                        gf_log (trans->xl->name, GF_LOG_WARNING,
+                                "invalid cbk '%d'", op);
+                } else {
+                        ret = gf_cbks[op] (frame, hdr, hdrlen, iobuf);
+                }
+                break;
+        default:
+                gf_log (trans->xl->name, GF_LOG_DEBUG,
+                        "invalid packet type: %d", type);
+                break;
+        }
+
+        return ret;
+}
+
+int32_t
+mem_acct_init (xlator_t *this)
+{
+        int     ret = -1;
+
+        if (!this)
+                return ret;
+
+        ret = xlator_mem_acct_init (this, gf_client_mt_end + 1);
+
+        if (ret != 0) {
+                gf_log (this->name, GF_LOG_ERROR, "Memory accounting init"
+                                "failed");
+                return ret;
+        }
+
+        return ret;
+}
+
+
+/*
+ * init - initiliazation function. called during loading of client protocol
+ * @this:
+ *
+ */
+
+int
+init (xlator_t *this)
+{
+        transport_t               *trans = NULL;
+        client_conf_t             *conf = NULL;
+        client_connection_t       *conn = NULL;
+        int32_t                    frame_timeout = 0;
+        int32_t                    ping_timeout = 0;
+        data_t                    *remote_subvolume = NULL;
+        int32_t                    ret = -1;
+        int                        i = 0;
+
+        if (this->children) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "FATAL: client protocol translator cannot have any "
+                        "subvolumes");
+                goto out;
+        }
+
+        if (!this->parents) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "Volume is dangling. ");
+        }
+
+        remote_subvolume = dict_get (this->options, "remote-subvolume");
+        if (remote_subvolume == NULL) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Option 'remote-subvolume' is not specified.");
+                goto out;
+        }
+
+        ret = dict_get_int32 (this->options, "frame-timeout",
+                              &frame_timeout);
+        if (ret >= 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "setting frame-timeout to %d", frame_timeout);
+        } else {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "defaulting frame-timeout to 30mins");
+                frame_timeout = 1800;
+        }
+
+        ret = dict_get_int32 (this->options, "ping-timeout",
+                              &ping_timeout);
+        if (ret >= 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "setting ping-timeout to %d", ping_timeout);
+        } else {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "defaulting ping-timeout to 42");
+                ping_timeout = GF_UNIVERSAL_ANSWER;
+        }
+
+        conf = GF_CALLOC (1, sizeof (client_conf_t),
+                          gf_client_mt_client_conf_t);
+
+        protocol_common_init ();
+
+        pthread_mutex_init (&conf->mutex, NULL);
+        INIT_LIST_HEAD (&conf->saved_fds);
+
+        this->private = conf;
+
+        for (i = 0; i < CHANNEL_MAX; i++) {
+                if (CHANNEL_LOWLAT == i) {
+                        dict_set (this->options, "transport.socket.lowlat",
+                                  data_from_dynstr (gf_strdup ("true")));
+                }
+                trans = transport_load (this->options, this);
+                if (trans == NULL) {
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "Failed to load transport");
+                        ret = -1;
+                        goto out;
+                }
+
+                conn = GF_CALLOC (1, sizeof (*conn),
+                                  gf_client_mt_client_connection_t);
+
+                conn->saved_frames = saved_frames_new ();
+
+                conn->callid = 1;
+
+                conn->frame_timeout = frame_timeout;
+                conn->ping_timeout = ping_timeout;
+
+                pthread_mutex_init (&conn->lock, NULL);
+
+                trans->xl_private = conn;
+                conf->transport[i] = transport_ref (trans);
+        }
+
+#ifndef GF_DARWIN_HOST_OS
+        {
+                struct rlimit lim;
+
+                lim.rlim_cur = 1048576;
+                lim.rlim_max = 1048576;
+
+                ret = setrlimit (RLIMIT_NOFILE, &lim);
+                if (ret == -1) {
+                        gf_log (this->name, GF_LOG_WARNING,
+                                "WARNING: Failed to set 'ulimit -n 1M': %s",
+                                strerror(errno));
+                        lim.rlim_cur = 65536;
+                        lim.rlim_max = 65536;
+
+                        ret = setrlimit (RLIMIT_NOFILE, &lim);
+                        if (ret == -1) {
+                                gf_log (this->name, GF_LOG_DEBUG,
+                                        "Failed to set max open fd to 64k: %s",
+                                        strerror(errno));
+                        } else {
+                                gf_log (this->name, GF_LOG_DEBUG,
+                                        "max open fd set to 64k");
+                        }
+
+                }
+        }
+#endif
+        ret = 0;
+out:
+        return ret;
+}
+
+/*
+ * fini - finish function called during unloading of client protocol
+ * @this:
+ *
+ */
+void
+fini (xlator_t *this)
+{
+        /* TODO: Check if its enough.. how to call transport's fini () */
+        client_conf_t *conf = NULL;
+
+        conf = this->private;
+        this->private = NULL;
+
+        if (conf) {
+                GF_FREE (conf);
+        }
+        return;
+}
+
+
+int
+protocol_client_handshake (xlator_t *this, transport_t *trans)
+{
+        gf_hdr_common_t        *hdr = NULL;
+        gf_mop_setvolume_req_t *req = NULL;
+        dict_t                 *options = NULL;
+        int32_t                 ret = -1;
+        int                     hdrlen = 0;
+        int                     dict_len = 0;
+        call_frame_t           *fr = NULL;
+        char                   *process_uuid_xl;
+
+        options = this->options;
+        ret = dict_set_str (options, "protocol-version", GF_PROTOCOL_VERSION);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to set protocol version(%s) in handshake msg",
+                        GF_PROTOCOL_VERSION);
+        }
+
+        ret = gf_asprintf (&process_uuid_xl, "%s-%s", this->ctx->process_uuid,
+                           this->name);
+        if (-1 == ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "asprintf failed while setting process_uuid");
+                goto fail;
+        }
+        ret = dict_set_dynstr (options, "process-uuid",
+                               process_uuid_xl);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to set process-uuid(%s) in handshake msg",
+                        process_uuid_xl);
+        }
+
+        if (this->ctx->cmd_args.volfile_server) {
+                if (this->ctx->cmd_args.volfile_id)
+                        ret = dict_set_str (options, "volfile-key",
+                                            this->ctx->cmd_args.volfile_id);
+                ret = dict_set_uint32 (options, "volfile-checksum",
+                                       this->graph->volfile_checksum);
+        }
+
+        dict_len = dict_serialized_length (options);
+        if (dict_len < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to get serialized length of dict(%p)",
+                        options);
+                ret = dict_len;
+                goto fail;
+        }
+
+        hdrlen = gf_hdr_len (req, dict_len);
+        hdr    = gf_hdr_new (req, dict_len);
+        GF_VALIDATE_OR_GOTO (this->name, hdr, fail);
+
+        req    = gf_param (hdr);
+
+        ret = dict_serialize (options, req->buf);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to serialize dictionary(%p)",
+                        options);
+                goto fail;
+        }
+
+        req->dict_len = hton32 (dict_len);
+        fr  = create_frame (this, this->ctx->pool);
+        GF_VALIDATE_OR_GOTO (this->name, fr, fail);
+
+        fr->local = trans;
+        ret = protocol_client_xfer (fr, this, trans,
+                                    GF_OP_TYPE_MOP_REQUEST, GF_MOP_SETVOLUME,
+                                    hdr, hdrlen, NULL, 0, NULL);
+        return ret;
+fail:
+        if (hdr)
+                GF_FREE (hdr);
+        return ret;
+}
+
+
+int
+protocol_client_pollout (xlator_t *this, transport_t *trans)
+{
+        client_conf_t *conf = NULL;
+
+        conf = trans->xl->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                gettimeofday (&conf->last_sent, NULL);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        return 0;
+}
+
+
+int
+protocol_client_pollin (xlator_t *this, transport_t *trans)
+{
+        client_conf_t *conf = NULL;
+        int            ret = -1;
+        struct iobuf  *iobuf = NULL;
+        char          *hdr = NULL;
+        size_t         hdrlen = 0;
+
+        conf = trans->xl->private;
+
+        pthread_mutex_lock (&conf->mutex);
+        {
+                gettimeofday (&conf->last_received, NULL);
+        }
+        pthread_mutex_unlock (&conf->mutex);
+
+        ret = transport_receive (trans, &hdr, &hdrlen, &iobuf);
+
+        if (ret == 0)
+        {
+                ret = protocol_client_interpret (this, trans, hdr, hdrlen,
+                                                 iobuf);
+        }
+
+        /* TODO: use mem-pool */
+        GF_FREE (hdr);
+
+        return ret;
+}
+
+int
+client_priv_dump (xlator_t *this)
+{
+        client_conf_t   *conf = NULL;
+        int             ret   = -1;
+        client_fd_ctx_t *tmp = NULL;
+        int             i = 0;
+        char            key[GF_DUMP_MAX_BUF_LEN];
+        char            key_prefix[GF_DUMP_MAX_BUF_LEN];
+
+        if (!this)
+                return -1;
+
+        conf = this->private;
+        if (!conf) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "conf null in xlator");
+                return -1;
+        }
+
+        ret = pthread_mutex_trylock(&conf->mutex);
+        if (ret) {
+                gf_log("", GF_LOG_WARNING, "Unable to lock client %s"
+                       " errno: %d", this->name, errno);
+                return -1;
+        }
+
+        gf_proc_dump_build_key(key_prefix, "xlator.protocol.client",
+                               "%s.priv", this->name);
+
+        gf_proc_dump_add_section(key_prefix);
+
+        list_for_each_entry(tmp, &conf->saved_fds, sfd_pos) {
+                gf_proc_dump_build_key(key, key_prefix,
+                                       "fd.%d.remote_fd", ++i);
+                gf_proc_dump_write(key, "%d", tmp->remote_fd);
+        }
+
+        gf_proc_dump_build_key(key, key_prefix, "connecting");
+        gf_proc_dump_write(key, "%d", conf->connecting);
+        gf_proc_dump_build_key(key, key_prefix, "last_sent");
+        gf_proc_dump_write(key, "%s", ctime(&conf->last_sent.tv_sec));
+        gf_proc_dump_build_key(key, key_prefix, "last_received");
+        gf_proc_dump_write(key, "%s", ctime(&conf->last_received.tv_sec));
+
+        pthread_mutex_unlock(&conf->mutex);
+
+        return 0;
+
+}
+
+int32_t
+client_inodectx_dump (xlator_t *this, inode_t *inode)
+{
+        ino_t   par = 0;
+        int     ret = -1;
+        char    key[GF_DUMP_MAX_BUF_LEN];
+
+        if (!inode)
+                return -1;
+
+        if (!this)
+                return -1;
+
+        ret = inode_ctx_get (inode, this, &par);
+
+        if (ret != 0)
+                return ret;
+
+        gf_proc_dump_build_key(key, "xlator.protocol.client",
+                               "%s.inode.%ld.par",
+                               this->name,inode->ino);
+        gf_proc_dump_write(key, "%ld", par);
+
+        return 0;
+}
+
+/*
+ * client_protocol_notify - notify function for client protocol
+ * @this:
+ * @trans: transport object
+ * @event
+ *
+ */
+
+int
+notify (xlator_t *this, int32_t event, void *data, ...)
+{
+        int                  i          = 0;
+        int                  ret        = -1;
+        int                  child_down = 1;
+        int                  was_not_down = 0;
+        transport_t         *trans      = NULL;
+        client_connection_t *conn       = NULL;
+        client_conf_t       *conf       = NULL;
+        xlator_list_t       *parent = NULL;
+
+        conf = this->private;
+        trans = data;
+
+        switch (event) {
+        case GF_EVENT_POLLOUT:
+        {
+                ret = protocol_client_pollout (this, trans);
+
+                break;
+        }
+        case GF_EVENT_POLLIN:
+        {
+                ret = protocol_client_pollin (this, trans);
+
+                break;
+        }
+        /* no break for ret check to happen below */
+        case GF_EVENT_POLLERR:
+        {
+                ret = -1;
+                protocol_client_cleanup (trans);
+
+                if (conf->connecting == 0) {
+                        /* Let the connection/re-connection happen in
+                         * background, for now, don't hang here,
+                         * tell the parents that i am all ok..
+                         */
+                        parent = trans->xl->parents;
+                        while (parent) {
+                                parent->xlator->notify (parent->xlator,
+                                                        GF_EVENT_CHILD_CONNECTING,
+                                                        trans->xl);
+                                parent = parent->next;
+                        }
+                        conf->connecting = 1;
+                }
+
+                was_not_down = 0;
+                for (i = 0; i < CHANNEL_MAX; i++) {
+                        conn = conf->transport[i]->xl_private;
+                        if (conn->connected == 1)
+                                was_not_down = 1;
+                }
+
+                conn = trans->xl_private;
+                if (conn->connected) {
+                        conn->connected = 0;
+                        if (conn->reconnect == 0)
+                                client_protocol_reconnect (trans);
+                }
+
+                child_down = 1;
+                for (i = 0; i < CHANNEL_MAX; i++) {
+                        trans = conf->transport[i];
+                        conn = trans->xl_private;
+                        if (conn->connected == 1)
+                                child_down = 0;
+                }
+
+                if (child_down && was_not_down) {
+                        gf_log (this->name, GF_LOG_INFO, "disconnected");
+
+                        protocol_client_mark_fd_bad (this);
+
+                        parent = this->parents;
+                        while (parent) {
+                                xlator_notify (parent->xlator,
+                                               GF_EVENT_CHILD_DOWN, this);
+                                parent = parent->next;
+                        }
+                }
+        }
+        break;
+
+        case GF_EVENT_PARENT_UP:
+        {
+                client_conf_t *conf = NULL;
+                int            i = 0;
+                transport_t   *trans = NULL;
+
+                conf = this->private;
+                for (i = 0; i < CHANNEL_MAX; i++) {
+                        trans = conf->transport[i];
+                        if (!trans) {
+                                gf_log (this->name, GF_LOG_DEBUG,
+                                        "transport init failed");
+                                return -1;
+                        }
+
+                        conn = trans->xl_private;
+
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "got GF_EVENT_PARENT_UP, attempting connect "
+                                "on transport");
+
+                        client_protocol_reconnect (trans);
+                }
+        }
+        break;
+
+        case GF_EVENT_CHILD_UP:
+        {
+                char *handshake = NULL;
+
+                ret = dict_get_str (this->options, "disable-handshake",
+                                    &handshake);
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "got GF_EVENT_CHILD_UP");
+                if ((ret < 0) ||
+                    (strcasecmp (handshake, "on"))) {
+                        ret = protocol_client_handshake (this, trans);
+                } else {
+                        conn = trans->xl_private;
+                        conn->connected = 1;
+                        ret = default_notify (this, event, trans);
+                }
+
+                if (ret)
+                        transport_disconnect (trans);
+
+        }
+        break;
+
+        default:
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "got %d, calling default_notify ()", event);
+
+                default_notify (this, event, data);
+                break;
+        }
+
+        return ret;
+}
+
+
+struct xlator_fops fops = {
+        .stat        = client_stat,
+        .readlink    = client_readlink,
+        .mknod       = client_mknod,
+        .mkdir       = client_mkdir,
+        .unlink      = client_unlink,
+        .rmdir       = client_rmdir,
+        .symlink     = client_symlink,
+        .rename      = client_rename,
+        .link        = client_link,
+        .truncate    = client_truncate,
+        .open        = client_open,
+        .readv       = client_readv,
+        .writev      = client_writev,
+        .statfs      = client_statfs,
+        .flush       = client_flush,
+        .fsync       = client_fsync,
+        .setxattr    = client_setxattr,
+        .getxattr    = client_getxattr,
+        .fsetxattr   = client_fsetxattr,
+        .fgetxattr   = client_fgetxattr,
+        .removexattr = client_removexattr,
+        .opendir     = client_opendir,
+        .readdir     = client_readdir,
+        .readdirp    = client_readdirp,
+        .fsyncdir    = client_fsyncdir,
+        .access      = client_access,
+        .ftruncate   = client_ftruncate,
+        .fstat       = client_fstat,
+        .create      = client_create,
+        .lk          = client_lk,
+        .inodelk     = client_inodelk,
+        .finodelk    = client_finodelk,
+        .entrylk     = client_entrylk,
+        .fentrylk    = client_fentrylk,
+        .lookup      = client_lookup,
+        .checksum    = client_checksum,
+        .rchecksum   = client_rchecksum,
+        .xattrop     = client_xattrop,
+        .fxattrop    = client_fxattrop,
+        .setattr     = client_setattr,
+        .fsetattr    = client_fsetattr,
+        .getspec   = client_getspec,
+};
+
+struct xlator_cbks cbks = {
+        .release    = client_release,
+        .releasedir = client_releasedir
+};
+
+
+struct xlator_dumpops dumpops = {
+        .priv      =  client_priv_dump,
+        .inodectx  =  client_inodectx_dump,
+};
+
+struct volume_options options[] = {
+        { .key   = {"username"},
+          .type  = GF_OPTION_TYPE_ANY
+        },
+        { .key   = {"password"},
+          .type  = GF_OPTION_TYPE_ANY
+        },
+        { .key   = {"transport-type"},
+          .value = {"tcp", "socket", "ib-verbs", "unix", "ib-sdp",
+                    "tcp/client", "ib-verbs/client"},
+          .type  = GF_OPTION_TYPE_STR
+        },
+        { .key   = {"remote-host"},
+          .type  = GF_OPTION_TYPE_INTERNET_ADDRESS
+        },
+        { .key   = {"remote-subvolume"},
+          .type  = GF_OPTION_TYPE_ANY
+        },
+        { .key   = {"frame-timeout"},
+          .type  = GF_OPTION_TYPE_TIME,
+          .min   = 0,
+          .max   = 86400,
+        },
+        { .key   = {"ping-timeout"},
+          .type  = GF_OPTION_TYPE_TIME,
+          .min   = 1,
+          .max   = 1013,
+        },
+        { .key   = {NULL} },
+};