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path: root/xlators/mgmt/glusterd/src/glusterd-snapshot.c
blob: 82335e892581a8ae8383b19a3f0febf792e4fca8 (plain)
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/*
   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.

   This file is licensed to you under your choice of the GNU Lesser
   General Public License, version 3 or any later version (LGPLv3 or
   later), or the GNU General Public License, version 2 (GPLv2), in all
   cases as published by the Free Software Foundation.
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif

#include <inttypes.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/resource.h>
#include <sys/statvfs.h>
#include <sys/mount.h>

#include "globals.h"
#include "compat.h"
#include "protocol-common.h"
#include "xlator.h"
#include "logging.h"
#include "timer.h"
#include "glusterd-mem-types.h"
#include "glusterd.h"
#include "glusterd-sm.h"
#include "glusterd-op-sm.h"
#include "glusterd-utils.h"
#include "glusterd-store.h"
#include "run.h"
#include "glusterd-volgen.h"
#include "glusterd-mgmt.h"

#include "syscall.h"
#include "cli1-xdr.h"
#include "xdr-generic.h"

#ifdef GF_LINUX_HOST_OS
#include <mntent.h>
#endif



/* This function will do the actual snapshot restore on the brick.
 *
 * @param brickinfo     brickinfo structure
 * @param snapname      name of the snap which will be restored
 *
 * @return              Negative value on Failure and 0 in success
 */
int
glusterd_snapshot_restore_brick_snap (glusterd_brickinfo_t *brickinfo,
                                      char *snapname)
{
        int             ret             = -1;
        char            *device         = NULL;
        xlator_t        *this           = NULL;
        runner_t        runner          = {0,};
        glusterd_conf_t *conf           = NULL;
        char            msg[PATH_MAX]   = {0,};

        this = THIS;
        GF_ASSERT (this);
        conf = this->private;

        GF_ASSERT (conf);
        GF_ASSERT (brickinfo);
        GF_ASSERT (snapname);

        /* Using the brickinfo get the actual device name */
        device = glusterd_get_brick_mount_details (brickinfo);

        runinit (&runner);
        snprintf (msg, sizeof (msg), "Restoring snapshot of the brick %s:%s "
                  "to %s snap", brickinfo->hostname, brickinfo->path, snapname);

        /* Command for restoring the snapshot */
        runner_add_args (&runner, "/sbin/lvconvert", "--merge", device, NULL);
        runner_log (&runner, "", GF_LOG_DEBUG, msg);

        synclock_unlock (&conf->big_lock);
        /* Run the actual command */
        ret = runner_run (&runner);
        synclock_lock (&conf->big_lock);

        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "snapshot restore of the "
                        "brick (%s:%s) of device %s failed",
                        brickinfo->hostname, brickinfo->path, device);
                goto out;
        }

out:
        return ret;
}

/* This function will restore the snapshot for the entire volume.
 *
 * @param snap          snap object which needs to be restored
 * @param op_errstr     In case of any failure error message will be returned
 *                      in this variable
 * @return              Negative value on Failure and 0 in success
 */
int
glusterd_snapshot_restore_snap (glusterd_snap_t *snap, char **op_errstr)
{
        int                     ret             = -1;
        xlator_t                *this           = NULL;
        glusterd_volinfo_t      *volinfo        = NULL;
        glusterd_brickinfo_t    *brickinfo      = NULL;

        this = THIS;

        GF_ASSERT (this);
        GF_ASSERT (snap);
        GF_ASSERT (snap->snap_volume);
        GF_ASSERT (op_errstr);

        /* For restore always take volinfo stored in snap. Do not use
         * volinfo of the original volume*/
        volinfo = snap->snap_volume;

        list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
                /* This code is executed on each node of the volume. We need
                 * to run the restore only on those bricks which are present
                 * in this node. Therefore check if node belongs to this node
                 * or not.
                 */
                if (uuid_compare (brickinfo->uuid, MY_UUID)) {
                        continue; /* Bricks not present in this node */
                }

                /* This case should never occur as volume is already stopped.
                 * Just to avoid a case where the brick is explicitly started
                 * by the user we have this check here.
                 */
                if (glusterd_is_brick_started (brickinfo)) {
                        ret = gf_asprintf (op_errstr, "Brick (%s: %s) is "
                                           "running therefore snapshot cannot "
                                           "be restored", brickinfo->hostname,
                                           brickinfo->path);
                        if (ret < 0) {
                                goto out;
                        }

                        gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
                        ret = -1;
                        goto out;
                }

                /* Do the actual snapshot restore */
                ret = glusterd_snapshot_restore_brick_snap (brickinfo,
                                                            snap->snap_name);
                if (ret) {
                        ret = gf_asprintf (op_errstr, "Snapshot restore failed"
                                           " for %s:%s", brickinfo->hostname,
                                           brickinfo->path);
                        if (ret < 0) {
                                goto out;
                        }

                        gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
                        ret = -1;
                        goto out;
                }

        }

        /* TODO: Move this code to postvalidate */
        snap->snap_restored = _gf_true;
        /* TODO: persist the change in store */

out:
        return ret;
}

/* This function will restore a snapshot for the entire
 * volume or the entire CG (Consistency Group)
 *
 * @param dict          dictionary containing snapshot restore request
 * @param op_errstr     In case of any failure error message will be returned
 *                      in this variable
 * @return              Negative value on Failure and 0 in success
 */
int
glusterd_snapshot_restore (dict_t *dict, char **op_errstr)
{
        int                     ret             = -1;
        int64_t                 i               = 0;
        int64_t                 volcount        = 0;
        char                    *volname        = NULL;
        char                    *snapname       = NULL;
        xlator_t                *this           = NULL;
        glusterd_volinfo_t      *volinfo        = NULL;
        glusterd_snap_t         *snap           = NULL;
        char                    key[PATH_MAX]   = {0,};

        this = THIS;

        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (op_errstr);

        ret = dict_get_int64 (dict, "volcount", &volcount);

        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to get volume count");
                goto out;
        }

        /* If we are performing snapshot restore of a CG then volcount will be
         * greater than 1 else volcount will be 1.
         */
        for (i = 0; i < volcount; ++i) {
                /* TODO: Start the index from 0 when Jarvis code is fixed */
                snprintf (key, sizeof (key), "volname%ld", i+1);
                ret = dict_get_str (dict, key, &volname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
                                        "get volume name");
                        goto out;
                }

                ret = glusterd_volinfo_find (volname, &volinfo);
                if (ret) {
                        ret = gf_asprintf (op_errstr, "Volume (%s) not found",
                                                volname);
                        if (ret < 0) {
                                goto out;
                        }
                        gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
                        ret = -1;
                        goto out;
                }

                ret = dict_get_str (dict, "snapname", &snapname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
                                        "snap name");
                        goto out;
                }

                snap = glusterd_find_snap_by_name (volinfo, snapname);
                if (NULL == snap) {
                        ret = gf_asprintf (op_errstr, "Snap (%s) not found",
                                                snapname);
                        if (ret < 0) {
                                goto out;
                        }
                        gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
                        ret = -1;
                        goto out;
                }

                /* Restore the snap for the entire volume */
                ret = glusterd_snapshot_restore_snap (snap, op_errstr);
                if (ret) {
                        /* No need to update op_errstr because it is assumed
                         * that the called function will do that in case of
                         * failure.
                         */
                        gf_log (this->name, GF_LOG_ERROR, "Failed to restore "
                                "snap for %s volume", volname);
                        goto out;
                }
        }

        ret = 0; /* Success */

        /* TODO: Need to check if we need to delete the snap after the
         * operation is successful or not. Also need to persist the state
         * of restore operation in the store.
         */
out:
        return ret;
}

/* This function is called before actual restore is taken place. This
 * function will validate whether the volume or CG is ready to be restored
 * or not.
 *
 * @param dict          dictionary containing snapshot restore request
 * @param op_errstr     In case of any failure error message will be returned
 *                      in this variable
 * @return              Negative value on Failure and 0 in success
 */
int
glusterd_snapshot_restore_prevalidate (dict_t *dict, char **op_errstr)
{
        int                     ret             = -1;
        int64_t                 i               = 0;
        int64_t                 volcount        = 0;
        gf_boolean_t            snap_restored   = _gf_false;
        char                    *volname        = NULL;
        char                    *snapname       = NULL;
        glusterd_volinfo_t      *volinfo        = NULL;
        glusterd_snap_t         *snap           = NULL;
        xlator_t                *this           = NULL;
        char                    key[PATH_MAX]   = {0, };

        this = THIS;

        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (op_errstr);

        ret = dict_get_int64 (dict, "volcount", &volcount);

        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to get volume count");
                goto out;
        }

        /* Snapshot restore will only work if the volume is stopped.
         * If volume is running then snapshot restore will fail. In
         * case of CG if any of the volume in the CG is running then
         * snapshot restore for the entire CG will fail
         */
        for (i = 0; i < volcount; ++i) {
                /* TODO: Start the index from 0 when Jarvis code is fixed */
                snprintf (key, sizeof (key), "volname%ld", i+1);
                ret = dict_get_str (dict, key, &volname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
                                        "get volume name");
                        goto out;
                }

                ret = glusterd_volinfo_find (volname, &volinfo);
                if (ret) {
                        ret = gf_asprintf (op_errstr, "Volume (%s) not found",
                                                volname);
                        if (ret < 0) {
                                goto out;
                        }
                        gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
                        ret = -1;
                        goto out;
                }

                if (glusterd_is_volume_started (volinfo)) {
                        ret = gf_asprintf (op_errstr, "Volume (%s) is running",
                                                volname);
                        if (ret < 0) {
                                goto out;
                        }
                        gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
                        ret = -1;
                        goto out;
                }

                ret = dict_get_str (dict, "snapname", &snapname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
                                        "snap name");
                        goto out;
                }

                snap = glusterd_find_snap_by_name (volinfo, snapname);
                if (NULL == snap) {
                        ret = gf_asprintf (op_errstr, "Snap (%s) not found",
                                                snapname);
                        if (ret < 0) {
                                goto out;
                        }
                        gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
                        ret = -1;
                        goto out;
                }

                snap_restored = snap->snap_restored;

                if (snap_restored) {
                        ret = gf_asprintf (op_errstr, "Snap (%s) already "
                                        "restored", snapname);
                        if (ret < 0) {
                                goto out;
                        }
                        gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
                        ret = -1;
                        goto out;
                }
        }

        ret = 0;
out:
        return ret;
}


int
glusterd_snapshot_config_limit_prevalidate (dict_t *dict, char **op_errstr,
                                            int config_command)
{
        char               *volname              = NULL;
        glusterd_volinfo_t *volinfo              = NULL;
        uint64_t            limit                = 0;
        xlator_t           *this                 = NULL;
        int                 ret                  = -1;
        char                err_str[PATH_MAX]    = {0,};
        glusterd_conf_t    *conf                 = NULL;

        this = THIS;

        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (op_errstr);

        conf = this->private;

        GF_ASSERT (conf);

        switch (config_command) {

        case GF_SNAP_CONFIG_SYS_MAX:
                ret = dict_get_uint64 (dict, "limit", &limit);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " snapshot limit");
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                if (limit < 0 || limit > GLUSTERD_SNAPS_MAX_LIMIT) {
                        ret = -1;
                        snprintf (err_str, PATH_MAX,"Invalid max snap limit "
                                   "%"PRIu64 ". Expected range 0 - %"PRIu64,
                                   limit, conf->snap_max_limit);
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                break;

        case GF_SNAP_CONFIG_VOL_MAX:
                // volume wide limit
                ret = dict_get_str (dict, "volname", &volname);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " volume name");
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                ret = glusterd_volinfo_find (volname, &volinfo);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " volinfo for volume %s", volname);
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                ret = dict_get_uint64 (dict, "limit", &limit);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " snapshot limit volinfo for volume %s",
                                   volname);
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                if (limit < 0 || limit > conf->snap_max_limit) {
                        ret = -1;
                        snprintf (err_str, PATH_MAX,"Invalid max snap limit "
                                   "%"PRIu64 " for volume %s. Expected range"
                                   " 0 - %"PRIu64, limit, volname,
                                   conf->snap_max_limit);
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                break;

        case GF_SNAP_CONFIG_CG_MAX:
                break;

        case GF_SNAP_CONFIG_DISPLAY:
                ret = dict_get_str (dict, "volname", &volname);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " volume name");
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                if (!strncmp (volname, "all", 3)) {
                        ret = 0;
                        goto out;
                }
                ret = glusterd_volinfo_find (volname, &volinfo);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " volinfo for volume %s", volname);
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                break;
        default:
                break;
        }
out:
        return ret;
}

int
glusterd_snapshot_config_prevalidate (dict_t *dict, char **op_errstr)
{
        int                config_command        = 0;
        xlator_t           *this                 = NULL;
        int                ret                   = -1;

        this = THIS;
        ret = dict_get_int32 (dict, "config-command", &config_command);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR,
                        "failed to get config-command type");
                goto out;
        }

        switch (config_command) {
        case GF_SNAP_CONFIG_SYS_MAX:
        case GF_SNAP_CONFIG_VOL_MAX:
        case GF_SNAP_CONFIG_CG_MAX:
        case GF_SNAP_CONFIG_DISPLAY:
                ret = glusterd_snapshot_config_limit_prevalidate (dict,
                                                                  op_errstr,
                                                                config_command);
                break;
        default:
                ret = -1;
                gf_log (this->name, GF_LOG_ERROR, "Incorrect config op");
                break;
        }
out:
        return ret;
}

int
glusterd_snapshot_create_prevalidate (dict_t *dict, char **op_errstr,
                               dict_t *rsp_dict)
{
        char               *volname              = NULL;
        glusterd_volinfo_t *volinfo              = NULL;
        int64_t            volume_count          = 0;
        char               volname_buf[PATH_MAX] = {0, };
        int64_t            i                     = 0;
        xlator_t           *this                 = NULL;
        int                ret                   = -1;

        this = THIS;

        ret = dict_get_int64 (dict, "volcount", &volume_count);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "failed to "
                        "get the volume count");
                goto out;
        }
        for (i = 0; i < volume_count; i++) {
                snprintf (volname_buf, sizeof (volname_buf),
                          "volname%ld", i+1);
                ret = dict_get_str (dict, volname_buf,
                                    &volname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR,
                                "failed to get volume name");
                        goto out;
                }
                ret = glusterd_volinfo_find (volname, &volinfo);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR,
                                "failed to get the volinfo for "
                                "the volume %s", volname);
                        goto out;
                }
                if (glusterd_is_defrag_on (volinfo)) {
                        ret = -1;
                        gf_log (this->name, GF_LOG_WARNING,
                                "rebalance process is running "
                                "for the volume %s", volname);
                        goto out;
                }
                //Also check whether geo replication is running
        }
out:
        return ret;
}

int
glusterd_snapshot_prevalidate (dict_t *dict, char **op_errstr,
                               dict_t *rsp_dict)
{
        int                snap_command          = 0;
        xlator_t           *this                 = NULL;
        int                ret                   = -1;

        this = THIS;

        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (rsp_dict); //not sure if this is needed, verify.

        ret = dict_get_int32 (dict, "type", &snap_command);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "unable to get the type of "
                        "the snapshot command");
                goto out;
        }

        switch (snap_command) {
        case (GF_SNAP_OPTION_TYPE_CREATE):
                ret = glusterd_snapshot_create_prevalidate (dict, op_errstr,
                                                            rsp_dict);
                break;

        case (GF_SNAP_OPTION_TYPE_CONFIG):
                ret = glusterd_snapshot_config_prevalidate (dict, op_errstr);
                break;

        case GF_SNAP_OPTION_TYPE_RESTORE:
                ret = glusterd_snapshot_restore_prevalidate (dict, op_errstr);
                if (ret) {
                        gf_log (this->name, GF_LOG_WARNING, "Snapshot restore "
                                        "validation failed");
                        goto out;
                }
                break;
        default:
                gf_log (this->name, GF_LOG_WARNING, "invalid snap command");
                goto out;
        }
out:
        return ret;
}

glusterd_snap_t*
glusterd_new_snap_object()
{
        glusterd_snap_t        *snap    = NULL;

        snap = GF_CALLOC (1, sizeof (*snap), gf_gld_mt_snap_t);

        if (snap) {
                LOCK_INIT (&snap->lock);
                INIT_LIST_HEAD (&snap->snap_list);
                snap->snap_status = GD_SNAP_STATUS_INIT;
        }

        return snap;

};

glusterd_snap_cg_t*
glusterd_new_snap_cg_object(int64_t volume_count)
{
        glusterd_snap_cg_t      *cg     = NULL;
        glusterd_volinfo_t      *volinfo = NULL;

        if (volume_count < 0) {
                gf_log (THIS->name, GF_LOG_ERROR, "Volume count < 0");
                return NULL;
        }

        cg = GF_CALLOC (1, (sizeof (*cg) +
                        (volume_count * sizeof (*volinfo))),
                        gf_gld_mt_snap_cg_t);

        if (cg) {
                LOCK_INIT (&cg->lock);
                INIT_LIST_HEAD (&cg->cg_list);
                cg->cg_status = GD_SNAP_STATUS_INIT;
                cg->volume_count = volume_count;
        }

        return cg;
}

int32_t
glusterd_add_snap (glusterd_volinfo_t *volinfo, glusterd_snap_t *snap)
{
        int              ret    = -1;
        uint64_t         count  = -1;
        glusterd_snap_t *entry  = NULL;
        glusterd_snap_t *last   = NULL;
        glusterd_snap_t *tmp    = NULL;

        GF_VALIDATE_OR_GOTO ("glusterd", volinfo, out);
        GF_VALIDATE_OR_GOTO ("glusterd", snap, out);

        LOCK (&volinfo->lock);
        {
                list_for_each_entry_safe (entry, tmp, &volinfo->snaps,
                                          snap_list) {
                        count++;
                        if (!strcmp (entry->snap_name, snap->snap_name) ||
                            !uuid_compare (entry->snap_id, snap->snap_id)) {
                                gf_log (THIS->name, GF_LOG_ERROR, "Found "
                                        "duplicate snap %s (%s)",
                                        entry->snap_name,
                                        uuid_utoa (entry->snap_id));
                                goto unlock;
                        }
                        last = entry;
                }
                list_add_tail (&snap->snap_list, &volinfo->snaps);
                volinfo->snap_count++;
                gf_log (THIS->name, GF_LOG_DEBUG, "Snap %s added @ %"PRIu64,
                        snap->snap_name, count);
                ret = 0;
        }
unlock:
        UNLOCK (&volinfo->lock);
out:
        gf_log ("", GF_LOG_TRACE, "Returning %d", ret);
        return ret;
}

glusterd_snap_t*
glusterd_find_snap_by_index (glusterd_volinfo_t *volinfo, uint64_t index)
{
        uint64_t         count  = 0;
        glusterd_snap_t *entry  = NULL;
        glusterd_snap_t *tmp    = NULL;

        GF_VALIDATE_OR_GOTO ("glusterd", volinfo, out);

        LOCK (&volinfo->lock);
        {
                list_for_each_entry_safe (entry, tmp, &volinfo->snaps,
                                          snap_list) {
                        if (index == count) {
                                gf_log (THIS->name, GF_LOG_DEBUG, "Found "
                                        "snap %s (%s)", entry->snap_name,
                                        uuid_utoa (entry->snap_id));
                                break;
                        }
                        ++count;
                }
        }
        UNLOCK (&volinfo->lock);
out:
        return entry;
}

glusterd_snap_t*
glusterd_find_snap_by_name (glusterd_volinfo_t *volinfo, char *snap_name)
{
        uint64_t         count  = -1;
        glusterd_snap_t *entry  = NULL;
        glusterd_snap_t *dup    = NULL;
        glusterd_snap_t *tmp    = NULL;

        GF_VALIDATE_OR_GOTO ("glusterd", volinfo, out);
        GF_VALIDATE_OR_GOTO ("glusterd", snap_name, out);

        LOCK (&volinfo->lock);
        {
                list_for_each_entry_safe (entry, tmp, &volinfo->snaps,
                                          snap_list) {
                        count++;
                        if (!strcmp (entry->snap_name, snap_name)) {
                                gf_log (THIS->name, GF_LOG_DEBUG, "Found "
                                        "snap %s (%s)", entry->snap_name,
                                        uuid_utoa (entry->snap_id));
                                dup = entry;
                                break;
                        }
                }
        }
        UNLOCK (&volinfo->lock);
out:
        return dup;
}

glusterd_snap_t*
glusterd_find_snap_by_id (glusterd_volinfo_t *volinfo, uuid_t snap_id)
{
        uint64_t         count  = -1;
        glusterd_snap_t *entry  = NULL;
        glusterd_snap_t *dup    = NULL;
        glusterd_snap_t *tmp    = NULL;

        GF_VALIDATE_OR_GOTO ("glusterd", volinfo, out);
        if (uuid_is_null(snap_id))
                goto out;

        LOCK (&volinfo->lock);
        {
                list_for_each_entry_safe (entry, tmp, &volinfo->snaps,
                                          snap_list) {
                        count++;
                        if (!uuid_compare (entry->snap_id, snap_id)) {
                                gf_log (THIS->name, GF_LOG_DEBUG, "Found "
                                        "snap %s (%s)", entry->snap_name,
                                        uuid_utoa (entry->snap_id));
                                dup = entry;
                                break;
                        }
                }
        }
        UNLOCK (&volinfo->lock);
out:
        return dup;
}

glusterd_snap_t*
glusterd_remove_snap_by_id (glusterd_volinfo_t *volinfo, uuid_t snap_id)
{
        glusterd_snap_t *entry  = NULL;

        GF_VALIDATE_OR_GOTO ("glusterd", volinfo, out);
        if (uuid_is_null(snap_id))
                goto out;

        entry = glusterd_find_snap_by_id (volinfo, snap_id);

        if (entry) {
                LOCK (&volinfo->lock);
                {
                        entry->snap_status = GD_SNAP_STATUS_DECOMMISSION;
                        list_del_init (&entry->snap_list);
                }
                UNLOCK (&volinfo->lock);
        }
out:
        return entry;
}

glusterd_snap_t*
glusterd_remove_snap_by_name (glusterd_volinfo_t *volinfo, char *snap_name)
{
        glusterd_snap_t *entry  = NULL;

        GF_VALIDATE_OR_GOTO ("glusterd", volinfo, out);
        GF_VALIDATE_OR_GOTO ("glusterd", snap_name, out);

        entry = glusterd_find_snap_by_name (volinfo, snap_name);

        if (entry) {
                LOCK (&volinfo->lock);
                {
                        entry->snap_status = GD_SNAP_STATUS_DECOMMISSION;
                        list_del_init (&entry->snap_list);
                }
                UNLOCK (&volinfo->lock);
        }
out:
        return entry;
}

// Big lock should already acquired before this is called
int32_t
glusterd_add_snap_cg (glusterd_conf_t *conf, glusterd_snap_cg_t *cg)
{
        int                     ret     = -1;
        uint64_t                count   = -1;
        glusterd_snap_cg_t     *entry   = NULL;
        glusterd_snap_cg_t     *last    = NULL;
        glusterd_snap_cg_t     *tmp     = NULL;

        GF_VALIDATE_OR_GOTO (THIS->name, conf, out);
        GF_VALIDATE_OR_GOTO (THIS->name, cg, out);

        list_for_each_entry_safe (entry, tmp, &conf->snap_cg, cg_list) {
                count++;
                if (!strcmp (entry->cg_name, cg->cg_name) ||
                    !uuid_compare (entry->cg_id, cg->cg_id)) {
                        gf_log (THIS->name, GF_LOG_ERROR, "Found duplicate "
                                "CG %s(%s)", entry->cg_name,
                                uuid_utoa(entry->cg_id));
                        goto out;
                }
                last = entry;
        }
        list_add_tail (&cg->cg_list, &conf->snap_cg);

        gf_log (THIS->name, GF_LOG_DEBUG, "Added CG %s (%s) @ %"PRIu64,
                cg->cg_name, uuid_utoa(cg->cg_id), count);
        ret = 0;
out:
        gf_log ("", GF_LOG_TRACE, "Returning %d", ret);
        return ret;
}

glusterd_snap_cg_t*
glusterd_find_snap_cg_by_name (glusterd_conf_t *conf, char *cg_name)
{
        glusterd_snap_cg_t     *entry   = NULL;
        glusterd_snap_cg_t     *dup     = NULL;
        glusterd_snap_cg_t     *tmp     = NULL;

        GF_VALIDATE_OR_GOTO (THIS->name, conf, out);
        GF_VALIDATE_OR_GOTO (THIS->name, cg_name, out);

        list_for_each_entry_safe (entry, tmp, &conf->snap_cg, cg_list) {
                if (!strcmp (entry->cg_name, cg_name)) {
                        gf_log (THIS->name, GF_LOG_DEBUG, "Found CG %s(%s)",
                                entry->cg_name, uuid_utoa(entry->cg_id));
                        dup = entry;
                        break;
                }
        }
out:
        return dup;
}

glusterd_snap_cg_t*
glusterd_find_snap_cg_by_id (glusterd_conf_t *conf, uuid_t cg_id)
{
        glusterd_snap_cg_t     *entry   = NULL;
        glusterd_snap_cg_t     *dup     = NULL;
        glusterd_snap_cg_t     *tmp     = NULL;

        GF_VALIDATE_OR_GOTO (THIS->name, conf, out);
        if (uuid_is_null (cg_id))
                goto out;

        list_for_each_entry_safe (entry, tmp, &conf->snap_cg, cg_list) {
                if (!uuid_compare (entry->cg_id, cg_id)) {
                        gf_log (THIS->name, GF_LOG_DEBUG, "Found CG %s(%s)",
                                entry->cg_name, uuid_utoa(entry->cg_id));
                        dup = entry;
                        break;
                }
        }
out:
        return dup;
}

glusterd_snap_cg_t*
glusterd_remove_snap_cg_by_name (glusterd_conf_t *conf, char *cg_name)
{
        glusterd_snap_cg_t      *entry  = NULL;

        GF_VALIDATE_OR_GOTO (THIS->name, conf, out);
        GF_VALIDATE_OR_GOTO (THIS->name, cg_name, out);

        entry = glusterd_find_snap_cg_by_name(conf, cg_name);
        if (entry) {
                entry->cg_status = GD_SNAP_STATUS_DECOMMISSION;
                list_del_init (&entry->cg_list);
        }
out:
        return entry;
}

glusterd_snap_cg_t*
glusterd_remove_snap_cg_by_id (glusterd_conf_t *conf, uuid_t cg_id)
{
        glusterd_snap_cg_t      *entry  = NULL;

        GF_VALIDATE_OR_GOTO (THIS->name, conf, out);
        if (uuid_is_null (cg_id))
                goto out;

        entry = glusterd_find_snap_cg_by_id (conf, cg_id);
        if (entry) {
                entry->cg_status = GD_SNAP_STATUS_DECOMMISSION;
                list_del_init (&entry->cg_list);
        }
out:
        return entry;
}

int32_t
glusterd_delete_snap_volume (glusterd_volinfo_t *volinfo,
                             glusterd_volinfo_t *snapinfo)
{
        int             ret = -1;
        GF_ASSERT (volinfo);

        ret = glusterd_store_delete_volume (volinfo, snapinfo);

        if (ret)
                goto out;

        ret = glusterd_volinfo_delete (snapinfo);
out:
        gf_log (THIS->name, GF_LOG_DEBUG, "returning %d", ret);
        return ret;
}

/* This function will retrieve the details of a single snap
 * and then serialize them to dictionary (dict)
 * This function is called under snap lock
 *
 * @param dict          dictionary where response should be serialized
 * @param keyprefix     Prefix used for all the keys for rspdict dictionary
 * @param entry         Snap object
 * @param detail        if 1 then more details will be added for snap list
 *
 * @return      -1 on failure and 0 on success.
 */
static int
glusterd_snapshot_get_snapdetail_lk (dict_t *dict, char *keyprefix,
                                  glusterd_snap_t *entry,
                                  int8_t detail)
{
        int             ret             = -1; /* Failure */
        const int       maxstrlen       = 256;
        char            *value          = NULL;
        char            *timestr        = NULL;
        struct tm       *tmptr          = NULL;
        xlator_t        *this           = NULL;
        char            key[maxstrlen];

        this = THIS;

        /* General parameter validation */
        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (keyprefix);
        GF_ASSERT (entry);

        /* Snap Name */
        value = gf_strdup (entry->snap_name);
        if (NULL == value) {
                goto out;
        }

        snprintf (key, sizeof (key), "%s.snapname", keyprefix);
        ret = dict_set_dynstr (dict, key, value);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                        "snap name in dictionary");
                goto out;
        }

        /* Snap ID */
        value = gf_strdup (uuid_utoa (entry->snap_id));
        if (NULL == value) {
                ret = -1;
                goto out;
        }

        ret = snprintf (key, sizeof (key), "%s.snap-id", keyprefix);
        if (ret < 0) { /* Only negative value is error */
                goto out;
        }

        ret = dict_set_dynstr (dict, key, value);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                                "snap id in dictionary");
                goto out;
        }

        /* Ownership of value transferred to dict. Therefore we must initalize
         * it to NULL */
        value = NULL;

        /* Snap Timestamp */

        /* convert time_t to tm struct. */
        tmptr = localtime (&(entry->time_stamp));
        if (NULL == tmptr) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to convert "
                                "time_t to *tm");
                ret = -1;
                goto out;
        }

        timestr = GF_CALLOC (1, maxstrlen, gf_gld_mt_char);
        if (NULL == timestr) {
                ret = -1;
                goto out;
        }

        /* Format time into string */
        ret = strftime (timestr, maxstrlen, "%Y-%m-%d %H:%M:%S", tmptr);
        if (0 == ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to convert time_t "
                        "to string");
                ret = -1;
                goto out;
        }

        ret = snprintf (key, sizeof (key), "%s.snap-time", keyprefix);
        if (ret < 0) { /* Only negative value is error */
                goto out;
        }

        ret = dict_set_dynstr (dict, key, timestr);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                                "snap time stamp in dictionary");
                goto out;
        }

        /* Ownership of timestr transferred to dict. Therefore we must initalize
         * it to NULL */
        timestr = NULL;

        if (!detail) {
                /* If detail is not needed then return from here */
                goto out;
        }

        /* Add detail */

        /* If CG name is set the add the details in the dictionary */
        if (0 != entry->cg_name[0] ) {
                /* CG name */
                value = gf_strdup (entry->cg_name);
                if (NULL == value) {
                        ret = -1;
                        goto out;
                }

                ret = snprintf (key, sizeof (key), "%s.cg-name", keyprefix);
                if (ret < 0) { /* Only negative value is error */
                        goto out;
                }

                ret = dict_set_dynstr (dict, key, value);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                                "snap name in dictionary");
                        goto out;
                }

                /* CG ID */
                value = gf_strdup (uuid_utoa (entry->cg_id));
                if (NULL == value) {
                        ret = -1;
                        goto out;
                }

                ret = snprintf (key, sizeof (key), "%s.cg-id", keyprefix);
                if (ret < 0) { /* Only negative value is error */
                        goto out;
                }

                ret = dict_set_dynstr (dict, key, value);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                                        "cg id in dictionary");
                        goto out;
                }

                /* Ownership of value transferred to dict. Therefore we must initalize
                * it to NULL */
                value = NULL;
        }

        /* If snap description is provided then add that into dictionary */
        if (NULL != entry->description) {
                /* Snap Description */
                value = gf_strdup (entry->description);
                if (NULL == value) {
                        ret = -1;
                        goto out;
                }

                ret = snprintf (key, sizeof (key), "%s.snap-desc", keyprefix);
                if (ret < 0) { /* Only negative value is error */
                        goto out;
                }

                ret = dict_set_dynstr (dict, key, value);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                                        "snap description in dictionary");
                        goto out;
                }
                /* Ownership of value transferred to dict. Therefore we must initalize
                * it to NULL */
                value = NULL;
        }

        /* Snap status */
        ret = snprintf (key, sizeof (key), "%s.snap-status", keyprefix);
        if (ret < 0) { /* Only negative value is error */
                goto out;
        }

        switch (entry->snap_status) {
                case GD_SNAP_STATUS_INIT:
                        ret = dict_set_str (dict, key, "Init");
                        break;
                case GD_SNAP_STATUS_IN_USE:
                        ret = dict_set_str (dict, key, "In-use");
                        break;
                case GD_SNAP_STATUS_DECOMMISSION:
                        ret = dict_set_str (dict, key, "Decommisioned");
                        break;
                case GD_SNAP_STATUS_RESTORED:
                        ret = dict_set_str (dict, key, "Restored");
                        break;
                case GD_SNAP_STATUS_NONE:
                        ret = dict_set_str (dict, key, "None");
                        break;
                default:
                        gf_log (this->name, GF_LOG_ERROR, "Invalid snap "
                                        "status");
                        ret = -1;
                        goto out;
        }

        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                                "snap status in dictionary");
                goto out;
        }

        ret = 0; /* Success */
out:
        if (NULL != value) {
                GF_FREE (value);
        }

        if (NULL != timestr) {
                GF_FREE(timestr);
        }
        return ret;
}

/* This function will retrieve the details of a single snap
 * and then serialize them to dictionary (dict)
 *
 * @param dict          dictionary where response should be serialized
 * @param keyprefix     Prefix used for all the keys for rspdict dictionary
 * @param entry         Snap object
 * @param detail        if 1 then more details will be added for snap list
 *
 * @return      -1 on failure and 0 on success.
 */
static int
glusterd_snapshot_get_snapdetail (dict_t *dict, char *keyprefix,
                                  glusterd_snap_t *entry,
                                  int8_t detail)
{
        int             ret     = -1;
        xlator_t        *this   = NULL;

        this = THIS;
        GF_ASSERT (this);

        /* General parameter validation */
        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (keyprefix);
        GF_ASSERT (entry);

        /* Acquire snap lock */
        LOCK (&(entry->lock));
        {
                ret = glusterd_snapshot_get_snapdetail_lk (dict, keyprefix,
                                entry, detail);
        }
        UNLOCK (&(entry->lock));

        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to get snap detail");
        }

        return ret;
}


/* This function will retrieve snap list for the given volume
 * and then serialize them to dict.
 * This function is called under volinfo lock.
 *
 * @param dict          dictionary where response should be serialized
 * @param keyprefix     Prefix used for all the keys for rspdict dictionary
 * @param volinfo       Volinfo object of the volume
 * @param snapname      snap name. This field can be NULL
 * @param detail        if 1 then more details will be added for snap list
 *
 * @return      -1 on failure and 0 on success.
 */
static int
glusterd_snapshot_vol_get_snaplist_lk (dict_t *dict, char *keyprefix,
                                    glusterd_volinfo_t *volinfo,
                                    char *snapname, int8_t detail)
{
        int                     ret     = -1;
        ssize_t                 index   = -1;
        glusterd_snap_t         *entry  = NULL;
        glusterd_snap_t         *tmp    = NULL;
        xlator_t                *this   = NULL;
        char                    *value  = NULL;
        char                    key[256];

        this = THIS;

        /* General parameter validation */
        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (keyprefix);
        GF_ASSERT (volinfo);

        value = gf_strdup (volinfo->volname);
        if (NULL == value) {
                goto out;
        }

        /* First set the volume name */
        ret = snprintf (key, sizeof (key), "%s.volname", keyprefix);
        if (ret < 0) { /* Only negative value is error */
                goto out;
        }

        ret = dict_set_dynstr (dict, key, value);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set volume name");
                goto out;
        }

        ret = snprintf (key, sizeof (key), "%s.snap-count-total", keyprefix);
        if (ret < 0) {
                goto out;
        }

        ret = dict_set_int64 (dict, key, volinfo->snap_count);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set total snap count");
                goto out;
        }
        /* Ownership of value transferred to dict. Therefore we must initalize
         * it to NULL */
        value = NULL;

        /* snapshot taken first should be displayed first */
        list_for_each_entry_safe (entry, tmp, &volinfo->snaps,
                                  snap_list) {
                ++index;
                ret = snprintf (key, sizeof (key), "%s.snap-%ld", keyprefix, index);
                if (ret < 0) { /* Only negative value is error */
                        goto out;
                }

                /* If snapname is NULL then get all the snaps
                 * for the given volume */
                if (NULL == snapname) {
                        ret = glusterd_snapshot_get_snapdetail (dict, key,
                                        entry, detail);
                        if (ret) {
                                gf_log (this->name, GF_LOG_ERROR, "Failed to "
                                                "get snap detail for %s snap",
                                                snapname);
                                goto out; /* something wrong */
                        }
                        continue; /* Get the next entry */
                }

                /* If snapname is provided then get snap detail
                 * for only that snap */
                if (strncmp (entry->snap_name, snapname,
                                        sizeof (entry->snap_name))) {
                        /* Entry not yet found.*/
                        ret = -1;
                        continue; /* Check the next entry */
                }

                /* snap found */
                ret = snprintf (key, sizeof (key), "%s.snap-0", keyprefix);
                if (ret < 0) { /* Only negative value is error */
                        goto out;
                }

                ret = glusterd_snapshot_get_snapdetail (dict,
                                key, entry, detail);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get snap "
                                        "detail for %s snap", snapname);
                        goto out;
                }

                /* Index is used to identify how many snap objects are
                 * added to the dictionary. If snapshot name is passed
                 * as argument then we would send only one snap object.
                 * Therefore index should be reset to 0. */
                index = 0;
                break; /* Found the snap */
        }

        /* If all the snap is written into the dictionary then write the
         * snap count into the dictionary */
        if (0 == ret) {
                ++index; /* To get count increment index by 1*/
                ret = snprintf (key, sizeof (key), "%s.snap-count", keyprefix);
                if (ret < 0) { /* Only negative value is error */
                        goto out;
                }

                ret = dict_set_int64 (dict, key, index);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                                "snap count");
                        goto out;

                }
        } else if (NULL != snapname) {
                gf_log (this->name, GF_LOG_ERROR, "Snap (%s) not found",
                                snapname);
        }

out:
        if (NULL != value) {
                GF_FREE (value);
        }

        return ret;
}

/* This function will retrieve snap list for the given volume
 * and then serialize them to dict.
 *
 * @param dict          dictionary where response should be serialized
 * @param keyprefix     Prefix used for all the keys for rspdict dictionary
 * @param volinfo       Volinfo object of the volume
 * @param snapname      snap name. This field can be NULL
 * @param detail        if 1 then more details will be added for snap list
 *
 * @return      -1 on failure and 0 on success.
 */
static int
glusterd_snapshot_vol_get_snaplist (dict_t *dict, char *keyprefix,
                                    glusterd_volinfo_t *volinfo,
                                    char *snapname, int8_t detail)
{
        int                     ret      = -1; /* Failure */
        xlator_t                *this    = NULL;

        this = THIS;

        /* General parameter validation */
        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (keyprefix);
        GF_ASSERT (volinfo);

        /* Acquire the volinfo lock before proceeding */
        LOCK (&(volinfo->lock));
        {
                ret = glusterd_snapshot_vol_get_snaplist_lk (dict, keyprefix,
                                        volinfo, snapname, detail);
        }
        UNLOCK (&(volinfo->lock));

        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to get snap list for"
                                " %s volume", volinfo->volname);
        }

        return ret;
}


/* This function will retrieve snap list for the given volume
 * and then serialize them to dict.
 *
 * @param dict          dictionary where response should be serialized
 * @param keyprefix     Prefix used for all the keys for rspdict dictionary
 * @param volname       Volname whose snap list is requested
 * @param snapname      snap name. This field can be NULL.
 * @param detail        if 1 then more details will be added for snap list
 *
 * @return      -1 on failure and 0 on success.
 */
static int
glusterd_snapshot_vol_get_snaplist_by_name (dict_t *dict, char *keyprefix,
                                            char *volname, char *snapname,
                                            int8_t detail)
{
        int                     ret      = -1;
        glusterd_volinfo_t      *volinfo = NULL;
        xlator_t                *this    = NULL;

        this = THIS;

        /* General parameter validation */
        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (keyprefix);
        GF_ASSERT (volname);

        /* Find te volinfo from the volname */
        ret = glusterd_volinfo_find (volname, &volinfo);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to get volinfo for "
                                "%s volume", volname);
                goto out;
        }

        /* Now using the volinfo object get the snap list */
        ret = glusterd_snapshot_vol_get_snaplist (dict, keyprefix, volinfo,
                                                snapname, detail);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to get snaplist for "
                                "%s volume", volname);
                goto out;
        }

out:
        return ret;
}



/* This function will retrieve snap list for all the volumes
 * present in a given CG and then serialize them to dict.
 * This function is called under CG lock.
 *
 * @param dict          dictionary where response should be serialized
 * @param cg            CG object which need to be written into dictionary
 * @param keyprefix     Prefix used for all the keys for rspdict dictionary
 * @param cgname        CG name.
 * @param detail        if 1 then more details will be added for snap list
 *
 * @return      -1 on failure and 0 on success.
 */
static int
glusterd_snapshot_cg_get_snaplist_lk (dict_t *dict, glusterd_snap_cg_t *cg,
                                      char *keyprefix, char *cgname,
                                      int8_t detail)
{
        int                     ret     = -1; /* Failure */
        glusterd_conf_t         *conf   = NULL;
        char                    *value  = NULL;
        xlator_t                *this   = NULL;
        int64_t                 i       = 0;
        char                    key[256]= {0,};

        this = THIS;

        /* General parameter validation */
        GF_ASSERT (this);
        conf = this->private;

        GF_ASSERT (conf);
        GF_ASSERT (dict);
        GF_ASSERT (cg);
        GF_ASSERT (keyprefix);
        GF_ASSERT (cgname);

        /* CG Name */
        value = gf_strdup (cg->cg_name);
        if (NULL == value) {
                goto out;
        }

        ret = snprintf (key, sizeof (key), "%s.cgname", keyprefix);
        if (ret < 0) { /* Only negative value is error */
                goto out;
        }

        ret = dict_set_dynstr (dict, key, value);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                        "cg name in dictionary");
                goto out;
        }

        /* CG ID */
        value = gf_strdup (uuid_utoa (cg->cg_id));
        if (NULL == value) {
                ret = -1;
                goto out;
        }

        ret = snprintf (key, sizeof (key), "%s.cg-id", keyprefix);
        if (ret < 0) { /* Only negative value is error */
                goto out;
        }

        ret = dict_set_dynstr (dict, key, value);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                                "cg id in dictionary");
                goto out;
        }

        /* Ownership of value transferred to dict. Therefore we must initalize
         * it to NULL */
        value = NULL;

        /* Volume count */
        ret = snprintf (key, sizeof (key), "%s.vol-count", keyprefix);
        if (ret < 0) { /* Only negative value is error */
                goto out;
        }

        ret = dict_set_int64 (dict, key, cg->volume_count);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                        "volume count in dictionary");
                goto out;
        }

        /* Get snap list for all volumes present in the CG */
        for (i = 0; i < cg->volume_count; ++i) {
                ret = snprintf (key, sizeof (key), "%s.vol%ld", keyprefix, i);
                if (ret < 0) { /* Only negative value is error */
                        goto out;
                }

                ret = glusterd_snapshot_vol_get_snaplist (dict, key,
                                &(cg->volumes[i]), NULL, detail);
                if (ret) {
                       gf_log (this->name, GF_LOG_ERROR, "Failed to get "
                                       "snaplist for %s volume",
                                       cg->volumes[i].volname);
                       goto out;
                }
        }

        if (!detail) {
                /* If detail is not needed then return from here */
                goto out;
        }

        /* If CG description is provided then add that into dictionary */
        if (NULL != cg->description) {
                /* CG Description */
                value = gf_strdup (cg->description);
                if (NULL == value) {
                        ret = -1;
                        goto out;
                }

                ret = snprintf (key, sizeof (key), "%s.cg-desc", keyprefix);
                if (ret < 0) { /* Only negative value is error */
                        goto out;
                }

                ret = dict_set_dynstr (dict, key, value);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                                        "cg description in dictionary");
                        goto out;
                }

                /* Ownership of value transferred to dict. Therefore we must initalize
                 * it to NULL */
                value = NULL;
        }


        /* CG status */
        ret = snprintf (key, sizeof (key), "%s.cg-status", keyprefix);
        if (ret < 0) { /* Only negative value is error */
                goto out;
        }

        switch (cg->cg_status) {
                case GD_SNAP_STATUS_INIT:
                        ret = dict_set_str (dict, key, "Init");
                        break;
                case GD_SNAP_STATUS_IN_USE:
                        ret = dict_set_str (dict, key, "In-use");
                        break;
                case GD_SNAP_STATUS_DECOMMISSION:
                        ret = dict_set_str (dict, key, "Decommisioned");
                        break;
                case GD_SNAP_STATUS_RESTORED:
                        ret = dict_set_str (dict, key, "Restored");
                        break;
                case GD_SNAP_STATUS_NONE:
                        ret = dict_set_str (dict, key, "None");
                        break;
                default:
                        gf_log (this->name, GF_LOG_ERROR, "Invalid snap "
                                        "status");
                        ret = -1; /* Failure */
                        goto out;
        }

        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                                "snap status in dictionary");
                goto out;
        }

        ret = 0;
out:
        if (NULL != value) {
                GF_FREE (value);
        }

        return ret;
}

/* This function will retrieve snap list for all the volumes
 * present in a given CG and then serialize them to dict.
 *
 * @param dict          dictionary where response should be serialized
 * @param keyprefix     Prefix used for all the keys for rspdict dictionary
 * @param cgname        CG name.
 * @param detail        if 1 then more details will be added for snap list
 *
 * @return      -1 on failure and 0 on success.
 */
static int
glusterd_snapshot_cg_get_snaplist (dict_t *dict, char *keyprefix,
                                   char *cgname, int8_t detail)
{
        int                     ret     = -1; /* Failure */
        glusterd_conf_t         *conf   = NULL;
        glusterd_snap_cg_t      *cg     = NULL;
        xlator_t                *this   = NULL;

        this = THIS;

        /* General parameter validation */
        GF_ASSERT (this);
        conf = this->private;

        GF_ASSERT (conf);
        GF_ASSERT (dict);
        GF_ASSERT (keyprefix);
        GF_ASSERT (cgname);

        /* Find the CG object from CG name */
        cg = glusterd_find_snap_cg_by_name (conf, cgname);

        if (NULL == cg) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to get "
                                "%s CG", cgname);
                goto out;
        }

        /* Got CG. Now serialize the CG content to dictionary */

        LOCK (&(cg->lock));
        {
                ret = glusterd_snapshot_cg_get_snaplist_lk (dict, cg, keyprefix,
                                                            cgname, detail);
        }
        UNLOCK (&(cg->lock));

        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to get CG details");
        }

        ret = 0; /* Success */
out:
        return ret;
}


/* This function will retrieve snap list for all the volumes
 * present in voldict dictionary. And then serialize them to
 * rspdict.
 *
 * @param voldict       dictionary containing volumes
 * @param rspdict       dictionary where response should be serialized
 * @param volcount      Total volume count
 * @param keyprefix     Prefix used for all the keys for rspdict dictionary
 * @param snapname      snap name. This field can be NULL.
 * @param detail        if 1 then more details will be added for snap list
 *
 * @return      -1 on failure and 0 on success.
 */
static int
glusterd_snapshot_get_snaplist (dict_t *voldict, dict_t *rspdict,
                                int64_t volcount, char* keyprefix,
                                char *snapname, int8_t detail)
{
        int             ret      = -1; /* Failure */
        int64_t         i        = 0;
        char            *volname = NULL;
        xlator_t        *this    = NULL;
        char            key[256] = {0,};
        gf_boolean_t    exist    = _gf_false;
        char           *err_str  = NULL;
        char            err_prefix[PATH_MAX] = "";

        this = THIS;

        /* General parameter validation */
        GF_ASSERT (this);
        GF_ASSERT (voldict);
        GF_ASSERT (rspdict);
        GF_ASSERT (keyprefix);

        /* Write the total volume count into the rspdict */
        ret = snprintf (key, sizeof (key), "%s.vol-count", keyprefix);
        if (ret < 0) { /* Only negative value is error */
                goto out;
        }

        ret = dict_set_int64 (rspdict, key, volcount);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
                        "volume count in dictionary");
                goto out;
        }

        /* For each volume add all the snap list to rspdict dictionary */
        for (i = 0; i < volcount; ++i) {
                /* This key is used to get the volume name from voldict
                 * dictionary. Therefore do not use keyprefix here
                 */
                ret = snprintf (key, sizeof (key), "vol%ld", i);
                if (ret < 0) { /* Only negative value is error */
                        goto out;
                }

                ret = dict_get_str (voldict, key, &volname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get"
                                "volname for %s", key);
                        goto out;
                }

                ret = snprintf (key, sizeof (key), "%s.vol%ld", keyprefix, i);
                if (ret < 0) { /* Only negative value is error */
                        goto out;
                }

                exist = glusterd_check_volume_exists (volname);
                if (!exist) {
                        err_str = (char *) GF_CALLOC(1, PATH_MAX, sizeof(char));
                        gf_log ("", GF_LOG_ERROR,
                                "Volume %s Does not exist", volname);
                        ret = snprintf (err_str, PATH_MAX,
                                        "Volume %s Does not exist",volname);
                        if (ret < 0) {
                                goto out;
                        }
                        ret = snprintf (err_prefix, sizeof (err_prefix),
                                        "%s.err_str", key);
                        if (ret < 0) {
                                goto out;
                        }
                        ret = dict_set_str (rspdict, err_prefix, err_str);
                        if (ret < 0 ) {
                                gf_log ("", GF_LOG_ERROR, "Could not"
                                        "save the err_str");
                                goto out;
                        }
                        continue;
                }

                /* Now for each volume get the snap list */
                ret = glusterd_snapshot_vol_get_snaplist_by_name (rspdict, key,
                                                volname, snapname, detail);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
                                "snapshot list for %s volume", volname);
                        goto out;
                }
        }

        ret = 0; /* Success */
out:
        return ret;
}



/* This function will be called from RPC handler routine.
 * This function is responsible for getting the requested
 * snapshot list into the dictionary.
 *
 * @param req   RPC request object. Required for sending a response back.
 * @param op    glusterd operation. Required for sending a response back.
 * @param dict  pointer to dictionary which will contain both
 *              request and response key-pair values.
 * @return -1 on error and 0 on success
 */
int
glusterd_handle_snapshot_list (rpcsvc_request_t *req, glusterd_op_t op,
                               dict_t *dict)
{
        int             ret        = -1;
        int64_t         volcount   = 0;
        int             vol_count  = 0;
        int8_t          detail     = 0;
        char            *keyprefix = "snaplist";
        char            *cgname    = NULL;
        char            *snapname  = NULL;
        char            *err_str   = "Operation failed";
        dict_t          *voldict   = NULL;
        xlator_t        *this      = NULL;
        char            key[256]   = {0,};

        this = THIS;
        GF_ASSERT (this);

        GF_VALIDATE_OR_GOTO (this->name, req, out);
        GF_VALIDATE_OR_GOTO (this->name, dict, out);

        /* Get the request key-pair from the dictionary */

        /* All these options are optonal. Therefore ignore
         * error returned by following dictionary operations
         */
        ret = dict_get_str (dict, "snapname", &snapname);
        /* Ignore error */
        ret = dict_get_int8 (dict, "snap-details", &detail);

        ret = dict_get_int64 (dict, "vol-count", &volcount);
        if (ret) {
                /* Ignore error */
                ret = dict_get_str (dict, "cgname", &cgname);
        }


        /* If volume names are passed as argument then we should
         * get all the snapshots for the said volumes.
         */
        if (volcount > 0) {
                ret = glusterd_snapshot_get_snaplist (dict, dict, volcount,
                                                      keyprefix, snapname,
                                                      detail);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
                                        "snapshot list");
                        goto out;
                }
        } else if (NULL != cgname) {
                /* If CG (Consistency Group) name is passed as argument then
                 * we should get snapshots of all the volumes present in the
                 * said CG
                 */

                /* TODO: Handle multiple CG if needed   */
                ret = snprintf (key, sizeof (key), "%s.cg-0", keyprefix);
                if (ret < 0) { /* Only negative value is error */
                        goto out;
                }

                ret = glusterd_snapshot_cg_get_snaplist (dict, key,
                                                         cgname, detail);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
                                        "snapshot list for %s CG", cgname);
                        goto out;
                }
        } else {
                /* If no argument is provided then we should get snapshots of
                 * all the volumes managed by this server
                 */

                /* Create a dictionary to hold all the volumes retrieved from
                 * glusterd
                 */
                voldict = dict_new ();
                if (NULL == voldict) {
                        ret = -1;
                        goto out;
                }

                /* Get all the volumes from glusterd */
                ret = glusterd_get_all_volnames (voldict);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get all "
                                        "volume names");
                        goto out;
                }

                /* Get the volume count */
                ret = dict_get_int32 (voldict, "vol_count", &vol_count);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get volume"
                                        " count");
                        goto out;
                }

                volcount = vol_count;
                /* Get snap list for all the volumes*/
                ret = glusterd_snapshot_get_snaplist (voldict, dict, volcount,
                                                      keyprefix, NULL, detail);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
                                        "snapshot list");
                        goto out;
                }
        }

        /* If everything is successful then send the response back to cli.
         * In case of failure the caller of this function will take of response.*/
        ret = glusterd_op_send_cli_response (op, 0, 0,
                                             req, dict, err_str);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to send cli "
                                "response");
                goto out;
        }

        ret = 0; /* Success */

out:
        if (voldict) {
                dict_unref (voldict);
        }
        return ret;
}

/* TODO: This function needs a revisit.
 *
 * As of now only one snap is supported per CG. This function will
 * retrieve the snap name which bleongs to the CG and put it in the
 * dictionary.
 *
 * @param dict          dictionary containing snapshot restore request
 * @param cg            CG object.
 *                      in this variable
 * @return              Negative value on Failure and 0 in success
 */
int
glusterd_get_cg_snap_name_lk (dict_t *dict, glusterd_snap_cg_t *cg)
{
        int             ret             = -1;
        uint64_t        snap_count      = 0;
        char            *snapname       = NULL;
        glusterd_snap_t *snap           = NULL;
        xlator_t        *this           = NULL;

        this = THIS;

        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (cg);
        /* CG should have at least one volume*/
        GF_ASSERT (cg->volume_count > 0);

        /* TODO: As of now only one snap is supported per CG When CG
         * management module comes in then this restriction can be removed.
         */
        snap_count = cg->volumes[0].snap_count;
        if (1 != snap_count) {
                gf_log (this->name, GF_LOG_ERROR, "More than one snap is "
                                "associated with the cg (%s)", cg->cg_name);
                ret = -1;
                goto out;
        }

        snap = glusterd_find_snap_by_index (&(cg->volumes[0]), 0);
        if (NULL == snap) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to get snap for "
                                "%s CG", cg->cg_name);
                ret = -1;
                goto out;
        }

        snapname = gf_strdup (snap->snap_name);
        if (NULL == snapname) {
                ret = -1;
                goto out;
        }

        ret = dict_set_dynstr (dict, "snapname", snapname);
        if (ret) {
                GF_FREE (snapname);
                gf_log (this->name, GF_LOG_ERROR, "Failed to "
                                "set snap name");
                goto out;
        }

out:
        return ret;
}

/* This is a helper function will get all the volume names present in CG
 * and write into dictionary.
 *
 * @param dict          dictionary where volume names should be written
 * @param cg            CG object.
 *                      in this variable
 * @return              Negative value on Failure and 0 in success
 */
int
glusterd_get_cg_volume_names_lk (dict_t *dict, glusterd_snap_cg_t *cg)
{
        int             ret             = -1;
        int64_t         i               = 0;
        char            *volname        = NULL;
        xlator_t        *this           = NULL;
        char            key[PATH_MAX]   = {0,};

        this = THIS;

        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (cg);

        ret = dict_set_int64 (dict, "volcount", cg->volume_count);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to "
                                "set volume count");
                goto out;
        }

        /* Set volume name of all the volumes present in CG in dict so that
         * Jarvis can use this to acquire volume locks on all the volume
         * present in the CG.
         */
        for (i = 0; i < cg->volume_count; ++i) {
                /* TODO: When Jarvis framework is fixed change the index
                 * to start from 0 instead of 1
                 */
                snprintf (key, sizeof (key), "volname%ld", i+1);
                volname = gf_strdup (cg->volumes[i].volname);
                if (NULL == volname) {
                        ret = -1;
                        goto out;
                }

                ret = dict_set_dynstr (dict, key, volname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR,
                                        "Failed to set volname");
                        GF_FREE (volname);
                        volname = NULL;
                        goto out;
                }
        }
        ret = 0;
out:
        return ret;
}

/* This is a snapshot restore handler function. This function will be
 * executed in the originator node. This function is responsible for
 * calling mgmt_v3 framework to do the actual restore on all the bricks
 *
 * @param req           RPC request object
 * @param op            gluster operation
 * @param dict          dictionary containing snapshot restore request
 * @param err_str       In case of an err this string should be populated
 * @param len           length of err_str buffer
 *
 * @return              Negative value on Failure and 0 in success
 */
int
glusterd_handle_snapshot_restore (rpcsvc_request_t *req, glusterd_op_t op,
                               dict_t *dict, char *err_str, size_t len)
{
        int                     ret             = -1;
        int64_t                 vol_count       = 0;
        char                    *volname        = NULL;
        char                    *snapname       = NULL;
        char                    *cgname         = NULL;
        glusterd_conf_t         *conf           = NULL;
        glusterd_snap_cg_t      *cg             = NULL;
        xlator_t                *this           = NULL;

        this = THIS;
        GF_ASSERT (this);
        conf = this->private;

        GF_ASSERT (conf);
        GF_ASSERT (req);
        GF_ASSERT (dict);
        GF_ASSERT (err_str);

        /* If volume name is provided then volcount will be set */
        ret = dict_get_int64 (dict, "volcount", &vol_count);
        if (ret) {
                /* If volcount is not provided then cgname must be there */
                ret = dict_get_str (dict, "cgname", &cgname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
                                        "get neither volcount nor cgname");
                        goto out;
                }
        } else {
                /* TODO: Change the index to 0 when Jarvis code is fixed */
                ret = dict_get_str (dict, "volname1", &volname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
                                        "get volname");
                        goto out;
                }
                ret = dict_get_str (dict, "snapname", &snapname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
                                        "get snapname");
                        goto out;
                }
        }

        if (NULL != cgname) { /* Snapshot restore of CG */
                cg = glusterd_find_snap_cg_by_name (conf, cgname);

                if (NULL == cg) {
                        snprintf (err_str, len, "CG %s not found", cgname);
                        gf_log (this->name, GF_LOG_WARNING, "%s", err_str);
                        ret = -1;
                        goto out;
                }

                LOCK (&cg->lock);
                {
                        /* First get the snap name of the CG */
                        ret = glusterd_get_cg_snap_name_lk (dict, cg);
                        if (ret) {
                                goto unlock;
                        }

                        /* Then get the volumes belong to CG */
                        ret = glusterd_get_cg_volume_names_lk (dict, cg);
                }
unlock:
                UNLOCK (&cg->lock);

                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
                                "volume names or snap name of %s CG", cgname);
                        goto out;
                }
        }

        ret = glusterd_mgmt_v3_initiate_snap_phases (req, op, dict);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to initiate snap "
                                "phases");
                goto out;
        }

        ret = 0; /* Success */
out:
        return ret;
}

/* this should be the last thing to be done.
   1. Do op stage related checks such as whether volume is there or not etc
   2. Do quorum checks.
   3. Then do this and take the snapshot OR take the snapshot and build the
      snap object (Can be decided later)
*/
int32_t
glusterd_snap_create (glusterd_volinfo_t *volinfo,
                      glusterd_volinfo_t *snap_volinfo,
                      char *description, uuid_t cg_id)
{
        glusterd_snap_t   *snap = NULL;
        xlator_t          *this = NULL;
        glusterd_conf_t   *priv = NULL;
        int               ret   = -1;
        uuid_t            snap_uuid;

        this = THIS;
        priv = this->private;

        if (!volinfo) {
                gf_log (this->name, GF_LOG_ERROR, "volinfo is NULL");
                goto out;
        }

        snap = glusterd_new_snap_object ();
        if (!snap) {
                gf_log (this->name, GF_LOG_ERROR, "could not create "
                        "the snap object fot the volume %s (snap: %s)",
                        volinfo->volname, snap_volinfo->volname);
                goto out;
        }


        // for now ignore if description is not strduped
        if (description)
                snap->description = gf_strdup (description);
        snap->time_stamp = time (NULL);
        uuid_generate (snap_uuid);
        uuid_copy (snap->snap_id, snap_uuid);
        if (!uuid_is_null (cg_id))
                uuid_copy (snap->cg_id, cg_id);
        snap->snap_volume = snap_volinfo;
        uuid_copy (snap_volinfo->volume_id, snap_uuid);
        strcpy (snap->snap_name, snap_volinfo->volname);
        //TODO: replace strcpy with strncpy

        ret = glusterd_add_snap (volinfo, snap);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "could not add the snap "
                        "object %s to the snap list of the volume %s",
                        snap_volinfo->volname, volinfo->volname);
                goto out;
        }

        snap->snap_status = GD_SNAP_STATUS_IN_USE;
out:
        if (ret) {
                if (snap) {
                        list_del_init (&snap->snap_list);
                        LOCK_DESTROY (&snap->lock);
                        GF_FREE (snap->description);
                        GF_FREE (snap->snap_volume);
                        GF_FREE (snap);
                }
        }

        gf_log ("", GF_LOG_TRACE, "Returning %d", ret);
        return ret;
}

int
glusterd_remove_snapshot (glusterd_brickinfo_t *brickinfo, char *volname,
                          char *snapname, const char *snap_device)
{
        int ret = -1;
        xlator_t *this = NULL;
        glusterd_conf_t *priv = NULL;
        runner_t                runner = {0,};
        char   msg[1024] = {0, };

        this = THIS;
        priv = this->private;

        if (!brickinfo) {
                gf_log (this->name, GF_LOG_ERROR, "brickinfo NULL");
                goto out;
        }

        snprintf (msg, sizeof(msg), "remove snapshot of the brick %s:%s, "
                  "device: %s", brickinfo->hostname, brickinfo->path,
                  snap_device);
        runner_add_args (&runner, "/sbin/lvmremove", snap_device, NULL);
        runner_log (&runner, "", GF_LOG_DEBUG, msg);

        //let glusterd get blocked till snapshot is over
        synclock_unlock (&priv->big_lock);
        ret = runner_run (&runner);
        synclock_lock (&priv->big_lock);

        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "removing snapshot of the "
                        "brick (%s:%s) of device %s failed",
                        brickinfo->hostname, brickinfo->path, snap_device);
                goto out;
        }

out:
        return ret;
}

int32_t
glusterd_brick_snapshot_remove (glusterd_volinfo_t *snap_volinfo,
                                glusterd_volinfo_t *actual_volinfo, char *name)
{
        char *mnt_pt = NULL;
        struct mntent *entry = NULL;
        int32_t  ret = -1;
        glusterd_brickinfo_t *brickinfo = NULL;
        xlator_t *this = NULL;
        FILE *mtab = NULL;

        this = THIS;
        GF_ASSERT (this);

        if (!snap_volinfo) {
                gf_log (this->name, GF_LOG_ERROR, "snap volinfo is NULL");
                goto out;
        }

        if (!actual_volinfo) {
                gf_log (this->name, GF_LOG_ERROR, "volinfo for the volume "
                        "is NULL");
                goto out;
        }

        if (!name) {
                gf_log (this->name, GF_LOG_ERROR, "snapname is NULL "
                        "(volume: %s)", actual_volinfo->volname);
                goto out;
        }

        list_for_each_entry (brickinfo, &snap_volinfo->bricks, brick_list) {
                ret = glusterd_get_brick_root (brickinfo->path, &mnt_pt);
                if (ret)
                        goto out;

                entry = glusterd_get_mnt_entry_info (mnt_pt, mtab);
                if (!entry) {
                        ret = -1;
                        goto out;
                }
                ret = glusterd_remove_snapshot (brickinfo,
                                                actual_volinfo->volname,
                                                name, entry->mnt_fsname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "failed to "
                                "remove the snapshot %s (%s)",
                                brickinfo->path, entry->mnt_fsname);
                        goto out;
                }
        }

        ret = 0;

out:
        if (mtab)
                endmntent (mtab);
        return ret;
}

/* This function is called to get the device path of the snap lvm. Usually
   if /dev/<group-name>/<group-name>-<lvm-name> is the device for the lvm,
   then the snap device will be /dev/<group-name>/<group-name>-<snap-name>.
   This function takes care of building the path for the snap device.
*/
char *
glusterd_build_snap_device_path (char *device, char *snapname)
{
        char   *tmp = NULL;
        char   snap[PATH_MAX] = {0, };
        char   msg[1024] = {0, };
        char   *str = NULL;
        int    device_len = 0;
        int    tmp_len = 0;
        int    var = 0;
        char   *snap_device = NULL;
        xlator_t *this = NULL;

        this = THIS;
        GF_ASSERT (this);
        if (!device) {
                gf_log (this->name, GF_LOG_ERROR, "device is NULL");
                goto out;
        }

        device_len = strlen (device);

        tmp = strrchr (device, '/');
        if (tmp)
                tmp++;
        str = gf_strdup (tmp);
        if (!str) {
                goto out;
        }

        tmp_len = strlen (str);
        var = device_len - tmp_len;
        device[var] = '\0';
        tmp = strchr (str, '-');
        if (tmp)
                tmp++;
        device_len = tmp_len;
        tmp_len = strlen (tmp);
        var = device_len - tmp_len;
        str[var] = '\0';
        msg[0] = '\0';
        strcpy (msg, str);
        strcat (msg, snapname);
        strcpy (snap, device);
        strcat (snap, msg);
        snap_device = gf_strdup (snap);
        if (!snap_device) {
                gf_log (this->name, GF_LOG_WARNING, "cannot copy the "
                        "snapshot device name "
                        "snapname: %s)", snapname);
                goto out;
        }

out:
        GF_FREE (str);
        return snap_device;
}

/* This function actually calls the command (or the API) for taking the
   snapshot of the backend brick filesystem. If this is successful,
   then call the glusterd_snap_create function to create the snap object
   for glusterd
*/
int
glusterd_take_snapshot (glusterd_brickinfo_t *brickinfo, char *volname,
                        char *snapname, dict_t *dict, char **snap_device)
{
        int ret = -1;
        xlator_t *this = NULL;
        glusterd_conf_t *priv = NULL;
        runner_t                runner = {0,};
        char   *device = NULL;
        char   msg[1024] = {0, };
        char  *tmp = NULL;

        this = THIS;
        priv = this->private;

        if (!brickinfo) {
                gf_log (this->name, GF_LOG_ERROR, "brickinfo NULL");
                goto out;
        }

        device = glusterd_get_brick_mount_details (brickinfo);
        if (!device) {
                gf_log (this->name, GF_LOG_ERROR, "getting device name for "
                        "the brick %s:%s failed", brickinfo->hostname,
                        brickinfo->path);
                goto out;
        }

        runinit (&runner);
        snprintf (msg, sizeof (msg), "taking snapshot of the brick %s:%s",
                  brickinfo->hostname, brickinfo->path);
        runner_add_args (&runner, "/sbin/lvcreate", "-s", device, "--name",
                         snapname, NULL);
        runner_log (&runner, "", GF_LOG_DEBUG, msg);

        //let glusterd get blocked till snapshot is over
        synclock_unlock (&priv->big_lock);
        ret = runner_run (&runner);
        synclock_lock (&priv->big_lock);

        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "taking snapshot of the "
                        "brick (%s:%s) of device %s failed",
                        brickinfo->hostname, brickinfo->path, device);
                goto out;
        }

        gf_log (this->name, GF_LOG_INFO, "device: %s", device);
        if (device) {
                tmp = glusterd_build_snap_device_path (device, snapname);
                *snap_device = tmp;
                if (!*snap_device) {
                        gf_log (this->name, GF_LOG_WARNING, "cannot copy the "
                                "snapshot device name (volname: %s, "
                                "snapname: %s)", volname, snapname);
                        ret = -1;
                        goto out;
                }
        }

out:
        gf_log ("", GF_LOG_TRACE, "Returning %d", ret);
        return ret;
}

int32_t
glusterd_snap_brick_create (char *device, glusterd_volinfo_t *snap_volinfo,
                            glusterd_brickinfo_t *original_brickinfo)
{
        int32_t   ret = -1;
        xlator_t  *this = NULL;
        glusterd_conf_t *priv = NULL;
        glusterd_brickinfo_t *snap_brickinfo = NULL;
        char      snap_brick_mount_path[PATH_MAX] = {0, };
        char      *tmp = NULL;
        char      *mnt_pt = NULL;
        struct mntent  *entry                = NULL;
        FILE *mtab = NULL;
        char *snap_brick_dir = NULL;
        char snap_brick_path[PATH_MAX] = {0, };

        this = THIS;
        priv = this->private;

        if (!device) {
                gf_log (this->name, GF_LOG_ERROR, "device is NULL");
                goto out;
        }

        if (!snap_volinfo) {
                gf_log (this->name, GF_LOG_ERROR, "snap volinfo is NULL");
                goto out;
        }

        if (!original_brickinfo) {
                gf_log (this->name, GF_LOG_ERROR, "original brickinfo is NULL"
                        "(snap: %s)", snap_volinfo->volname);
                goto out;
        }

        tmp = gf_strdup (device);
        if (!tmp) {
                gf_log (this->name, GF_LOG_INFO, "out of memory");
                goto out;
        }

        glusterd_replace_slash_with_hyphen (tmp);
        if (tmp[0] == '-')
                tmp[0] = '/';

        ret = glusterd_get_brick_root (original_brickinfo->path, &mnt_pt);
        if (ret) {
                gf_log (this->name, GF_LOG_WARNING, "could not get the root of"
                        "the brick path %s", original_brickinfo->path);
                goto out;
        }

        if (strncmp (original_brickinfo->path, mnt_pt, strlen (mnt_pt))) {
                gf_log (this->name, GF_LOG_WARNING, "brick: %s brick mount: %s",
                        original_brickinfo->path, mnt_pt);
                goto out;
        }

        snap_brick_dir = &original_brickinfo->path[strlen (mnt_pt)];
        if (snap_brick_dir)
                snap_brick_dir++;

        snprintf (snap_brick_mount_path, sizeof (snap_brick_mount_path),
                  "%s/%s%s-brick",  GLUSTERD_DEFAULT_SNAPS_BRICK_DIR,
                  snap_volinfo->volname, tmp);

        snprintf (snap_brick_path, sizeof (snap_brick_path), "%s/%s",
                  snap_brick_mount_path, snap_brick_dir);


        entry = glusterd_get_mnt_entry_info (mnt_pt, mtab);
        if (!entry) {
                ret = -1;
                goto out;
        }

        ret = mkdir_p (snap_brick_mount_path, 0777, _gf_true);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "creating the brick directory"
                        " %s for the snapshot %s(device: %s) failed",
                        snap_brick_mount_path, snap_volinfo->volname, device);
                goto out;
        }
        /* mount the snap logical device on the directory inside
           /var/run/gluster/snaps/<snapname>/@snap_brick_mount_path
        */
        ret = mount (device, snap_brick_mount_path, entry->mnt_type, MS_MGC_VAL,
                     "nouuid");
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "mounting the snapshot "
                        "logical device %s failed (error: %s)", device,
                        strerror (errno));
                goto out;
        }

        ret = glusterd_brickinfo_new (&snap_brickinfo);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR,
                        "initializing the brick for the snap "
                        "volume failed (snapname: %s)", snap_volinfo->volname);
                goto out;
        }

        strcpy (snap_brickinfo->hostname, original_brickinfo->hostname);
        strcpy (snap_brickinfo->path, snap_brick_path);
        LOCK (&snap_volinfo->lock);
        {
                list_add_tail (&snap_brickinfo->brick_list,
                               &snap_volinfo->bricks);
        }
        UNLOCK (&snap_volinfo->lock);
out:
        GF_FREE (tmp);
        if (ret) {
                umount (snap_brick_mount_path);
                if (snap_brickinfo)
                        glusterd_brickinfo_delete (snap_brickinfo);
        }
        if (mtab)
                endmntent (mtab);

        gf_log ("", GF_LOG_TRACE, "Returning %d", ret);
        GF_FREE (mnt_pt);
        return ret;
}

/* TODO: lvm uses '-' as the delimter for differentiating the logical volume
   name and the volume group name. So as of now, if the snapname given from
   cli contains '-', it confuses lvm. Handle it.
*/
int32_t
glusterd_do_snap (glusterd_volinfo_t *volinfo, char *name, dict_t *dict,
                  gf_boolean_t cg, uuid_t cg_id)
{
        int32_t                 ret = -1;
        xlator_t                *this = NULL;
        glusterd_conf_t         *priv = NULL;
        glusterd_brickinfo_t    *brickinfo = NULL;
        char *device = NULL;
        char snapname[PATH_MAX] = {0, };
        char tmp[2046] = {0, };
        glusterd_volinfo_t *snap_volume = NULL;
        char *description = NULL;

        this = THIS;
        GF_ASSERT (this);

        priv = this->private;
        GF_ASSERT (priv);

        if (cg) {
                snprintf (tmp, sizeof (tmp), "%s_snap", volinfo->volname);
                snprintf (snapname, sizeof (snapname), "%s_%s", name, tmp);
        } else {
                snprintf (snapname, sizeof (snapname), "%s", name);
        }

        ret = glusterd_volinfo_dup (volinfo, &snap_volume);
        strcpy (snap_volume->volname, snapname);
        snap_volume->is_snap_volume = _gf_true;

        list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
                if (uuid_compare (brickinfo->uuid, MY_UUID)) {
                        continue;
                }

                if (!glusterd_is_brick_started (brickinfo)) {
                        gf_log (this->name, GF_LOG_WARNING, "brick %s:%s is not"
                                " started (volume: %s snap: %s)",
                                brickinfo->hostname, brickinfo->path,
                                volinfo->volname, snapname);
                        continue;
                }

                ret = glusterd_take_snapshot (brickinfo,
                                              volinfo->volname,
                                              snapname, dict, &device);
                /* continue with the snapshot even though snapshot
                   on one of the bricks fails. At the end check
                   whether the snapshot volume meets quorum or not.
                   If so, then the snapshot can be treated as success.
                   If not, undo the changes and return failure to cli.
                */
                if (ret)
                        continue;

                /*create the complete brick here and add it to the
                  volinfo
                        */
                ret = glusterd_snap_brick_create (device, snap_volume,
                                                  brickinfo);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "not able to"
                                " create the brickinfo for the snap %s"
                                ", volume %s", snapname,
                                        volinfo->volname);
                        goto out;
                }
        }

        //TODO: the quorum check of the snap volume here

        ret = dict_get_str (dict, "snap-description", &description);
        // for now continue the snap, if getting description fails.

        ret = glusterd_snap_create (volinfo, snap_volume, description, cg_id);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "creating the"
                        "snap object failed for the volume %s",
                        volinfo->volname);
                goto out;
        }

        ret = glusterd_store_perform_snap_store (volinfo);
        if (ret) {
                gf_log (this->name, GF_LOG_WARNING, "could not do volume store"
                        " after taking the snapshot (volume: %s)",
                        volinfo->volname);
                goto out;
        }

        ret = generate_snap_brick_volfiles (volinfo, snap_volume);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "generating the brick "
                        "volfiles for the snap %s (volume: %s) failed",
                        snapname, volinfo->volname);
                goto out;
        }

        ret = generate_snap_client_volfiles (volinfo, snap_volume,
                                            GF_CLIENT_TRUSTED);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "generating the trusted "
                        "client volfiles for the snap %s (volume: %s) failed",
                        snapname, volinfo->volname);
                goto out;
        }

        ret = generate_snap_client_volfiles (volinfo, snap_volume,
                                            GF_CLIENT_OTHER);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "generating the client "
                        "volfiles for the snap %s (volume: %s) failed",
                        snapname, volinfo->volname);
                goto out;
        }

        //check whether this is needed or not
        list_add_tail (&snap_volume->vol_list, &priv->volumes);

        list_for_each_entry (brickinfo, &snap_volume->bricks, brick_list) {
                ret = glusterd_snap_brick_start (volinfo, snap_volume, brickinfo,
                                                 _gf_true);
                if (ret) {
                        gf_log (this->name, GF_LOG_WARNING, "starting the "
                                "brick %s:%s for the snap %s (volume: %s) "
                                "failed", brickinfo->hostname,
                                brickinfo->path, snapname, volinfo->volname);
                        goto out;
                }
        }

        snap_volume->status = GLUSTERD_STATUS_STARTED;

out:
        if (ret)
                glusterd_volinfo_delete (snap_volume);

        gf_log ("", GF_LOG_TRACE, "Returning %d", ret);
        return ret;
}

int32_t
glusterd_do_snap_remove (glusterd_volinfo_t *volinfo, char *name, dict_t *dict)
{
        int32_t  ret = -1;
        xlator_t *this = NULL;
        glusterd_conf_t *priv = NULL;
        glusterd_snap_t *snap = NULL;
        glusterd_snap_cg_t *cg = NULL;
        int i = 0;

        this = THIS;
        priv = this->private;

        if (!volinfo) {
                gf_log (this->name, GF_LOG_ERROR, "volinfo NULL");
                goto out;
        }

        if (!name) {
                gf_log (this->name, GF_LOG_ERROR, "name is NULL (volume: %s)",
                        volinfo->volname);
                goto out;
        }

        snap = glusterd_find_snap_by_name (volinfo, name);
        if (!snap) {
                cg = glusterd_find_snap_cg_by_name (priv, volinfo->volname);
                if (!cg) {
                        gf_log (this->name, GF_LOG_ERROR, "could not find "
                                "the snap or the cg object by the name %s",
                                name);
                        goto out;
                }
        }

        if (snap) {
                ret = glusterd_brick_snapshot_remove (snap->snap_volume,
                                                      volinfo, name);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "removing the bricks"
                                " snapshots for the snap %s (volume: %s) "
                                "failed", name, volinfo->volname);
                        goto out;
                }
        }

        if (cg) {
                for (i = 0; i < cg->volume_count ; i++) {
                        ret = glusterd_brick_snapshot_remove (&cg->volumes[i],
                                                              volinfo, name);
                        if (ret) {
                                gf_log (this->name, GF_LOG_ERROR, "removing the"
                                        " bricks snapshots for the snap %s "
                                        "(volume: %s) failed", name,
                                        volinfo->volname);
                                goto out;
                        }
                }
        }

        ret = 0;
out:
        return ret;
}


/* This function helps in generating the names for either the snapshot
   (if only one volume name is given in the snap create command) or
   the consistency group (if multiple volume names are given in the snaap
   create command). Apart from that, it also helps in generating the names
   for the snaps of the individual volumes in a consistency group.
*/
char *
generate_snapname (char *volname, char *name, gf_boolean_t volume_from_cg)
{
        char internal_snapname[PATH_MAX] = {0, };
        char timestr[256] = {0, };
        int ret = -1;
        char *snapname = NULL;
        struct timeval tv = {0, };
        xlator_t *this = NULL;
        int      i = 0;

        this = THIS;
        GF_ASSERT (this);

        if (name) {
                GF_ASSERT (volname);
                if (volume_from_cg) {
                        snprintf (internal_snapname, sizeof (internal_snapname),
                                  "%s_%s", volname, name);
                } else {
                        snprintf (internal_snapname, sizeof (internal_snapname),
                                  "%s", name);
                }
        } else {
                ret = gettimeofday (&tv, NULL);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR,
                                "getting time failed. snapname is not given via"
                                "cli. ");
                        goto out;
                }
                gf_time_fmt (timestr, sizeof (timestr),
                             tv.tv_sec, gf_timefmt_FT);
                snprintf (timestr + strlen (timestr),
                          sizeof timestr - strlen (timestr),
                          ".%"GF_PRI_SUSECONDS,
                          tv.tv_usec);

                for (i = 0; i < strlen (timestr); i++) {
                        if (timestr[i] == ' ' || timestr[i] == ':' ||
                            timestr[i] == '.' || timestr[i] == '-')
                                timestr[i] = '_';
                }

                snprintf (internal_snapname,
                          sizeof (internal_snapname), "%s%s",
                          (volume_from_cg)?"cg_":"",
                          timestr);
        }

        snapname = gf_strdup (internal_snapname);
out:
        return snapname;
}

/* name can be either the snapname if @volnames contains only one volume or
   cg name if there are multiple volume names in volnames string
*/

int32_t
glusterd_snapshot_create_commit (dict_t *dict, char **op_errstr,
                                 dict_t *rsp_dict)
{
        int                     ret                     = -1;
        int                     i                       = 0;
        int64_t                 volume_count            = 0;
        gf_boolean_t            is_cg                   = _gf_false;
        char                    *name                   = NULL;
        char                    *volname                = NULL;
        char                    *tmp                    = NULL;
        char                    volname_buf[PATH_MAX]   = {0, };
        xlator_t                *this                   = NULL;
        glusterd_volinfo_t      *volinfo                = NULL;
        glusterd_snap_cg_t      *cg                     = NULL;
        glusterd_conf_t         *priv                   = NULL;
        uuid_t cg_id;
        glusterd_snap_t         *snap                   = NULL;
        char                    err_str[PATH_MAX]       = {0, };

        this = THIS;

        ret = dict_get_int64 (dict, "volcount", &volume_count);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "failed to "
                        "get the volume count");
                goto out;
        }

        //snap-name should not be set if volume_count > 1
        ret = dict_get_str (dict, "snap-name", &name);
        if (volume_count > 1 && !ret)
                GF_ASSERT (0);

        if (volume_count > 1) {
                is_cg = _gf_true;
                ret = dict_get_str (dict, "cg-name", &name);
                uuid_generate (cg_id);
        } else if (volume_count == 1) {
                ret = dict_get_str (dict, "snap-name", &name);
        }

        if (!name) {
                name = generate_snapname (volname, NULL, is_cg);
                if (!name) {
                        gf_log (this->name, GF_LOG_ERROR,
                                "strdup of internal snapname"
                                " ((%s) failed for the "
                                "volume %s", name,
                                volname);
                        goto out;
                }
        }

        for (i = 1; i < volume_count + 1; i++) {
                snprintf (volname_buf, sizeof (volname_buf),
                          "volname%d", i);
                ret = dict_get_str (dict, volname_buf,
                                    &volname);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR,
                                "failed to get volume name");
                        goto out;
                }

                ret = glusterd_volinfo_find (volname, &volinfo);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR,
                                "failed to get the volinfo for "
                                "the volume %s", volname);
                        goto out;
                }

                tmp = generate_snapname (volname, name, is_cg);
                if (!tmp) {
                        gf_log (this->name,
                                GF_LOG_ERROR, "strdup "
                                "failed (%s)", name);
                        goto out;
                }

                list_for_each_entry (snap, &volinfo->snaps, snap_list) {
                        if (!strcmp (snap->snap_name, tmp)) {
                                snprintf (err_str, sizeof (err_str), "snap "
                                          "with name %s already exists", tmp);
                                gf_log (this->name, GF_LOG_ERROR, "%s",
                                        err_str);
                                ret = -1;
                                *op_errstr = gf_strdup (err_str);
                                goto out;
                        }
                }

                /* TODO: Create a stub where the bricks are
                   added parallely by worker threads so that
                   the snap creating happens parallely.
                */
                ret = glusterd_do_snap (volinfo, tmp, dict, is_cg, cg_id);
                if (ret) {
                        gf_log (this->name, GF_LOG_WARNING, "taking the "
                                "snapshot of the volume %s failed", volname);
                        goto out;
                }
        }

        if (volume_count > 1) {
                cg = glusterd_new_snap_cg_object (volume_count);
                if (!cg) {
                        gf_log (this->name, GF_LOG_ERROR, "cannot create the "
                                "consistency group %s", name);
                        goto out;
                }

                uuid_copy (cg->cg_id, cg_id);
                strncpy (cg->cg_name, name, sizeof (cg->cg_name));
                ret = glusterd_add_snap_cg (priv, cg);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "could not add the"
                                " consistency group %s to the glusterd list ",
                                name);
                        cg = glusterd_remove_snap_cg_by_name (priv, name);
                        if (!cg)
                                gf_log (this->name, GF_LOG_WARNING, "cannot "
                                        "find the consistency group %s", name);
                        goto out;
                }
        }
out:
        gf_log ("", GF_LOG_TRACE, "Returning %d", ret);
        return ret;
}

int
glusterd_snapshot_config_commit (dict_t *dict, char **op_errstr,
                                 dict_t *rsp_dict)
{
        char               *volname              = NULL;
        glusterd_volinfo_t *volinfo              = NULL;
        uint64_t            limit                = 0;
        xlator_t           *this                 = NULL;
        int                 ret                  = -1;
        char                err_str[PATH_MAX]    = {0,};
        glusterd_conf_t    *conf                 = NULL;
        int                 config_command       = 0;

        this = THIS;

        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (rsp_dict);
        GF_ASSERT (op_errstr);

        conf = this->private;

        GF_ASSERT (conf);

        ret = dict_get_int32 (dict, "config-command", &config_command);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR,
                        "failed to get config-command type");
                goto out;
        }

        switch (config_command) {

        case GF_SNAP_CONFIG_SYS_MAX:
                ret = dict_get_uint64 (dict, "limit", &limit);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " snapshot limit");
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                conf->snap_max_limit = limit;
                ret = glusterd_store_global_info (this);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to store the"
                                   " snapshot limit volinfo for system");
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                break;

        case GF_SNAP_CONFIG_VOL_MAX:
                // volume wide limit
                ret = dict_get_str (dict, "volname", &volname);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " volume name");
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                ret = glusterd_volinfo_find (volname, &volinfo);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " volinfo for volume %s", volname);
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                ret = dict_get_uint64 (dict, "limit", &limit);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " snapshot limit volinfo for volume %s",
                                   volname);
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                volinfo->snap_max_limit = limit;
                ret = glusterd_store_volinfo (volinfo,
                                             GLUSTERD_VOLINFO_VER_AC_INCREMENT);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to store the"
                                   " snapshot limit volinfo for volume %s",
                                   volname);
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                break;

        case GF_SNAP_CONFIG_CG_MAX:
                break;
        case GF_SNAP_CONFIG_DISPLAY:
                ret = dict_get_str (dict, "volname", &volname);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " volume name");
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                if (!strncmp (volname, "all", 3)) {
                        limit = conf->snap_max_limit;
                } else {
                        ret = glusterd_volinfo_find (volname, &volinfo);
                        if (ret) {
                                snprintf (err_str, PATH_MAX,"Failed to get the"
                                           " volinfo for volume %s", volname);
                                *op_errstr = gf_strdup (err_str);
                                gf_log (this->name, GF_LOG_ERROR, "%s",
                                        err_str);
                                goto out;
                        }
                        limit = volinfo->snap_max_limit;
                }

                ret = dict_set_uint64 (rsp_dict, "limit", limit);
                if (ret) {
                        snprintf (err_str, PATH_MAX,"Failed to get the"
                                   " set limit for volume %s",
                                   volname);
                        *op_errstr = gf_strdup (err_str);
                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                        goto out;
                }
                break;

        default:
                break;
        }

        ret = dict_set_str (rsp_dict, "volname", volname);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "Failed to set the"
                        " volume name");
                goto out;
        }

        ret = dict_set_int32 (dict, "config-command", config_command);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR,
                        "failed to set config-command type");
                goto out;
        }
out:
        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
        return ret;
}

int32_t
glusterd_snapshot (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
{

        xlator_t        *this           = NULL;
        glusterd_conf_t *priv           = NULL;
        int32_t          snap_command   = 0;
        int              ret            = -1;

        this = THIS;

        GF_ASSERT (this);
        GF_ASSERT (dict);
        GF_ASSERT (rsp_dict); //not sure if this is needed, verify.

        priv = this->private;
        GF_ASSERT (priv);

        ret = dict_get_int32 (dict, "type", &snap_command);
        if (ret) {
                gf_log (this->name, GF_LOG_ERROR, "unable to get the type of "
                        "the snapshot command");
                goto out;
        }

        switch (snap_command) {
        case (GF_SNAP_OPTION_TYPE_CREATE):
                ret = glusterd_snapshot_create_commit (dict, op_errstr,
                                                       rsp_dict);
                if (ret) {
                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
                                "create snapshot");
                        goto out;
                }
                break;

        case GF_SNAP_OPTION_TYPE_CONFIG:
                ret = glusterd_snapshot_config_commit (dict, op_errstr,
                                                       rsp_dict);
                break;

        case GF_SNAP_OPTION_TYPE_RESTORE:
                ret = glusterd_snapshot_restore (dict, op_errstr);
                if (ret) {
                        gf_log (this->name, GF_LOG_WARNING, "Failed to "
                                "restore snapshot");
                        goto out;
                }

                break;

        default:
                gf_log (this->name, GF_LOG_WARNING, "invalid snap command");
                goto out;
                break;
        }

        ret = 0;
out:
        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
        return ret;
}

int
glusterd_handle_snapshot_fn (rpcsvc_request_t *req)
{
        int32_t               ret            = 0;
        dict_t               *dict           = NULL;
        gf_cli_req            cli_req        = {{0},};
        glusterd_op_t         cli_op         = GD_OP_SNAP;
        int                   type           = 0;
        glusterd_conf_t      *conf           = NULL;
        char                 *host_uuid      = NULL;
        char                  err_str[2048]  = {0,};
        xlator_t             *this           = NULL;

        GF_ASSERT (req);

        this = THIS;
        GF_ASSERT (this);
        conf = this->private;
        GF_ASSERT (conf);

        ret = xdr_to_generic (req->msg[0], &cli_req,
                              (xdrproc_t)xdr_gf_cli_req);
        if (ret < 0) {
                req->rpc_err = GARBAGE_ARGS;
                goto out;
        }

        if (cli_req.dict.dict_len > 0) {
                dict = dict_new ();
                if (!dict)
                        goto out;

                ret = dict_unserialize (cli_req.dict.dict_val,
                                        cli_req.dict.dict_len,
                                        &dict);
                if (ret < 0) {
                        gf_log (this->name, GF_LOG_ERROR, "failed to "
                                "unserialize req-buffer to dictionary");
                        snprintf (err_str, sizeof (err_str), "Unable to decode "
                                  "the command");
                        goto out;
                }

                dict->extra_stdfree = cli_req.dict.dict_val;

                host_uuid = gf_strdup (uuid_utoa(MY_UUID));
                if (host_uuid == NULL) {
                        snprintf (err_str, sizeof (err_str), "Failed to get "
                                  "the uuid of local glusterd");
                        ret = -1;
                        goto out;
                }
                ret = dict_set_dynstr (dict, "host-uuid", host_uuid);
                if (ret) {
                        GF_FREE (host_uuid);
                        goto out;
                }


        } else {
                gf_log (this->name, GF_LOG_ERROR, "request dict length is %d",
                        cli_req.dict.dict_len);
                goto out;
        }

        ret = dict_get_int32 (dict, "type", &type);
        if (ret < 0) {
                snprintf (err_str, sizeof (err_str), "Command type not found");
                gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                goto out;
        }

        switch (type) {
        case GF_SNAP_OPTION_TYPE_CREATE:
                ret = glusterd_mgmt_v3_initiate_snap_phases (req, cli_op, dict);
                break;
        case GF_SNAP_OPTION_TYPE_RESTORE:
                ret = glusterd_handle_snapshot_restore (req, cli_op, dict,
                                                err_str, sizeof (err_str));
                if (ret) {
                        gf_log (this->name, GF_LOG_WARNING, "Snapshot restore "
                                        "failed: %s", err_str);
                }

                break;
        case GF_SNAP_OPTION_TYPE_LIST:
                ret = glusterd_handle_snapshot_list (req, cli_op, dict);
                if (ret) {
                        gf_log (this->name, GF_LOG_WARNING, "Snapshot list "
                                        "failed");
                }
                break;
        case GF_SNAP_OPTION_TYPE_CONFIG:
                ret = glusterd_mgmt_v3_initiate_all_phases (req, cli_op, dict);
                break;
        case GF_SNAP_OPTION_TYPE_DELETE:
        case GF_SNAP_OPTION_TYPE_START:
        case GF_SNAP_OPTION_TYPE_STOP:
        case GF_SNAP_OPTION_TYPE_STATUS:
                gf_log (this->name, GF_LOG_ERROR, "Operation (%d) not "
                                "supported ", type);

                ret = -1; /* Failure */
                break;

        default:
                gf_log (this->name, GF_LOG_ERROR, "Unkown snapshot request "
                        "type (%d)", type);
                ret = -1; /* Failure */
        }

out:
        if (ret) {
                if (err_str[0] == '\0')
                        snprintf (err_str, sizeof (err_str),
                                  "Operation failed");
                ret = glusterd_op_send_cli_response (cli_op, ret, 0, req,
                                                     dict, err_str);
        }

        return ret;
}

int
glusterd_handle_snapshot (rpcsvc_request_t *req)
{
        return glusterd_big_locked_handler (req, glusterd_handle_snapshot_fn);
}