NFS-Ganesha: Volume set option for managing NFS-Ganesha exports.

A dummy translator has been introduced as a place
holder for functions related to managing NFS-Ganesha
exports. A volume set option is introduced to
manage volume level exports.

gluster vol set <volname> ganesha.enable ON/OFF

1. gluster volume set <volname> ganesha.enable ON

It creates the export config file with a unique export ID.
Sends a DBus signal to export this volume dynamically.

2. gluster vol set <volname> ganesha.enable OFF

Unexports the specific volume. Deletes the specfic
config file related to the volume.

This change also removes the handling of the older
keys "nfs-ganesha.enable" and "nfs-ganesha.host"

Change-Id: I8d4a0b542326a6a0c8e4711600b106274d666587
BUG: 1188184
Signed-off-by: Meghana Madhusudhan <mmadhusu@redhat.com>
Reviewed-on: http://review.gluster.org/9585
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>

1 files changed, 365 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-ganesha.c b/xlators/mgmt/glusterd/src/glusterd-ganesha.c
new file mode 100644
index 00000000000..267e4b995cd
--- /dev/null
+++ b/xlators/mgmt/glusterd/src/glusterd-ganesha.c
@@ -0,0 +1,365 @@
+/*
+   Copyright (c) 2015 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 "common-utils.h"
+#include "glusterd.h"
+#include "glusterd-op-sm.h"
+#include "glusterd-store.h"
+#include "glusterd-utils.h"
+#include "glusterd-nfs-svc.h"
+#define MAXBUF 1024
+#define DELIM "=\""
+
+/* Following 2 functions parses GANESHA_HA_CONF
+ * The sample file looks like below,
+ * HA_NAME="ganesha-ha-360"
+ * HA_VOL_NAME="ha-state"
+ * HA_VOL_MNT="/mount-point"
+ * HA_VOL_SERVER="server1"
+ * HA_CLUSTER_NODES="server1,server2"
+ * VIP_rhs_1="10.x.x.x"
+ * VIP_rhs_2="10.x.x.x." */
+
+gf_boolean_t
+is_ganesha_host (void)
+{
+        char    *host_from_file          = NULL;
+        FILE    *fp;
+        char    line[MAXBUF];
+        gf_boolean_t    ret              = _gf_false;
+        int     i                        = 1;
+        xlator_t        *this            = NULL;
+
+        this = THIS;
+
+        fp = fopen (GANESHA_HA_CONF, "r");
+
+        if (fp == NULL) {
+                gf_log (this->name, GF_LOG_INFO, "couldn't open the file %s",
+                        GANESHA_HA_CONF);
+                return _gf_false;
+        }
+
+         while (fgets (line, sizeof(line), fp) != NULL) {
+                /* Read GANESHA_HA_CONFIG till we find the HA VOL server */
+                host_from_file = strstr ((char *)line, "HA_VOL_SERVER");
+                if (host_from_file != NULL) {
+                        host_from_file = strstr (host_from_file, DELIM);
+                        host_from_file = host_from_file + strlen(DELIM);
+                        i = strlen(host_from_file);
+                        host_from_file[i - 2] = '\0';
+                        break;
+                }
+        }
+
+        ret = gf_is_local_addr (host_from_file);
+        if (ret) {
+                gf_log (this->name, GF_LOG_INFO, "ganesha host found "
+                        "Hostname is %s", host_from_file);
+        }
+
+        fclose (fp);
+        return ret;
+}
+
+/* Check if the localhost is listed as one of nfs-ganesha nodes */
+gf_boolean_t
+check_host_list (void)
+{
+
+        char    *host_from_file          = NULL;
+        glusterd_conf_t     *priv        = NULL;
+        char    *hostname                = NULL;
+        FILE    *fp;
+        char    line[MAXBUF];
+        int     ret                      = _gf_false;
+        int     i                        = 1;
+        xlator_t        *this            = NULL;
+
+        this = THIS;
+        priv =  THIS->private;
+        GF_ASSERT (priv);
+
+        fp = fopen (GANESHA_HA_CONF, "r");
+
+        if (fp == NULL) {
+                gf_log (this->name, GF_LOG_INFO, "couldn't open the file %s",
+                        GANESHA_HA_CONF);
+                return 0;
+        }
+
+       while (fgets (line, sizeof(line), fp) != NULL) {
+        /* Read GANESHA_HA_CONFIG till we find the list of HA_CLUSTER_NODES */
+                hostname = strstr ((char *)line, "HA_CLUSTER_NODES");
+                if (hostname != NULL) {
+                        hostname = strstr (hostname, DELIM);
+                        hostname = hostname + strlen(DELIM);
+                        i = strlen (hostname);
+                        hostname[i - 2] = '\0';
+                        break;
+                }
+        }
+
+        /* Hostname is a comma separated list now */
+        hostname = strtok (hostname, ",");
+        while (hostname != NULL) {
+                ret = gf_is_local_addr (hostname);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_INFO, "ganesha host found "
+                                "Hostname is %s", hostname);
+                        break;
+                }
+                hostname = strtok (NULL, ",");
+        }
+
+        fclose (fp);
+        return ret;
+
+}
+
+int
+create_export_config (char *volname, char **op_errstr)
+{
+        runner_t                runner                     = {0,};
+        int                     ret                        = -1;
+
+        GF_ASSERT(volname);
+        runinit (&runner);
+        runner_add_args (&runner, "sh",
+                        GANESHA_PREFIX"/create-export-ganesha.sh",
+                        CONFDIR, volname, NULL);
+        ret = runner_run(&runner);
+
+        if (ret)
+                gf_asprintf (op_errstr, "Failed to create"
+                            " NFS-Ganesha export config file.");
+
+        return ret;
+}
+
+int
+ganesha_manage_export (dict_t *dict, char *value, char **op_errstr)
+{
+        runner_t                 runner = {0,};
+        int                      ret = -1;
+        char                     str[1024];
+        glusterd_volinfo_t      *volinfo = NULL;
+        char                    *volname = NULL;
+        xlator_t                *this    = NULL;
+        int                     i = 1;
+
+        runinit (&runner);
+        this =  THIS;
+
+        GF_ASSERT (value);
+        GF_ASSERT (dict);
+
+        ret = dict_get_str (dict, "volname", &volname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to get volume name");
+                goto out;
+        }
+
+        ret = glusterd_volinfo_find (volname, &volinfo);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        FMTSTR_CHECK_VOL_EXISTS, volname);
+                goto out;
+        }
+
+        /* Create the export file only when ganesha.enable "on" is executed */
+         if (strcmp (value, "on") == 0) {
+                ret  =  create_export_config (volname, op_errstr);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to create"
+                                "export file for NFS-Ganesha\n");
+                        goto out;
+                }
+        }
+
+        if (check_host_list()) {
+                runner_add_args (&runner, "sh", GANESHA_PREFIX"/dbus-send.sh",
+                         CONFDIR, value, volname, NULL);
+                ret = runner_run (&runner);
+                if (ret)
+                        gf_asprintf(op_errstr, "Dynamic export"
+                                    " addition/deletion failed."
+                                    "Please see log file for details");
+        }
+out:
+        return ret;
+}
+
+int
+tear_down_cluster(void)
+{
+        int     ret     =       0;
+        runner_t runner =       {0,};
+
+        if (is_ganesha_host()) {
+                runinit (&runner);
+                runner_add_args (&runner, "sh", CONFDIR,
+                                GANESHA_PREFIX"/ganesha-ha.sh", "teardown",
+                                CONFDIR, NULL);
+                ret = runner_run(&runner);
+        }
+        return ret;
+}
+
+
+int
+setup_cluster(void)
+{
+        int ret         = 0;
+        runner_t runner = {0,};
+
+        if (is_ganesha_host()) {
+                runinit (&runner);
+                runner_add_args (&runner, "sh", GANESHA_PREFIX"/ganesha-ha.sh",
+                                 "setup", CONFDIR,  NULL);
+                ret =  runner_run (&runner);
+        }
+        return ret;
+}
+
+
+int
+stop_ganesha (char **op_errstr)
+{
+        runner_t                runner                     = {0,};
+        int                     ret                        = 1;
+
+        ret = tear_down_cluster();
+        if (ret == -1) {
+                gf_asprintf (op_errstr, "Cleanup of NFS-Ganesha"
+                             "HA config failed.");
+                goto out;
+        }
+
+        if (check_host_list ()) {
+                runinit (&runner);
+                runner_add_args (&runner, "service nfs-ganesha", "stop", NULL);
+                ret =  runner_run (&runner);
+        }
+out:
+        return ret;
+}
+
+int
+start_ganesha (char **op_errstr)
+{
+
+        runner_t                runner                     = {0,};
+        int                     ret                        = -1;
+        char                    key[1024]                  = {0,};
+        char                    *hostname                  = NULL;
+        dict_t *vol_opts                                   = NULL;
+        glusterd_volinfo_t *volinfo                        = NULL;
+        int count                                          = 0;
+        char *volname                                      = NULL;
+        glusterd_conf_t *priv                              = NULL;
+
+        priv =  THIS->private;
+        GF_ASSERT (priv);
+
+        cds_list_for_each_entry (volinfo, &priv->volumes, vol_list) {
+                vol_opts = volinfo->dict;
+                /* Gluster-nfs has to be disabled across the trusted pool */
+                /* before attempting to start nfs-ganesha */
+                ret = dict_set_str (vol_opts, "nfs.disable", "on");
+                if (ret)
+                        goto out;
+        }
+
+        ret = priv->nfs_svc.stop (&(priv->nfs_svc), SIGKILL);
+        if (ret) {
+                ret = -1;
+                gf_asprintf (op_errstr, "Gluster-NFS service could"
+                             "not be stopped, exiting.");
+                goto out;
+        }
+
+        if (check_host_list()) {
+                runinit(&runner);
+                runner_add_args (&runner, "service",
+                                 "nfs-ganesha", "start", NULL);
+
+                ret =  runner_run (&runner);
+                if (ret) {
+                        gf_asprintf (op_errstr, "NFS-Ganesha failed to start."
+                        "Please see log file for details");
+                        goto out;
+                }
+
+                ret = setup_cluster();
+                if (ret == -1) {
+                        gf_asprintf (op_errstr, "Failed to set up HA "
+                                     "config for NFS-Ganesha."
+                                     "Please check the log file for details");
+                        goto out;
+                }
+        }
+
+out:
+        return ret;
+}
+
+int
+glusterd_handle_ganesha_op (dict_t *dict, char **op_errstr,
+                            char *key, char *value)
+{
+
+        int32_t                 ret          = -1;
+        char                   *volname      = NULL;
+        xlator_t               *this         = NULL;
+        static int             export_id     = 1;
+        glusterd_volinfo_t     *volinfo      = NULL;
+        char *option                         = NULL;
+
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (key);
+        GF_ASSERT (value);
+
+        /* TODO: enable only if global option is set */
+        /* BUG ID : 1200265 */
+
+        if (strcmp (key, "ganesha.enable") == 0) {
+                ret =  ganesha_manage_export(dict, value, op_errstr);
+                if (ret < 0)
+                        goto out;
+        }
+
+        if (strcmp (key, "features.ganesha") == 0) {
+                if (strcmp (value, "enable") == 0) {
+                        ret = start_ganesha(op_errstr);
+                        if (ret < 0)
+                                goto out;
+                }
+
+        else if (strcmp (value, "disable") == 0) {
+                ret = stop_ganesha (op_errstr);
+                if (ret < 0)
+                        goto out;
+                }
+        }
+
+out:
+        return ret;
+}
+