libdmmp/libdmmp_pg.c

   1 /*
   2  * Copyright (C) 2015 - 2016 Red Hat, Inc.
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  *
  17  * Author: Gris Ge <fge@redhat.com>
  18  *         Todd Gill <tgill@redhat.com>
  19  */
  20
  21 #include <stdlib.h>
  22 #include <stdint.h>
  23 #include <inttypes.h>
  24 #include <string.h>
  25 #include <assert.h>
  26 #include <json.h>
  27
  28 #include "libdmmp/libdmmp.h"
  29 #include "libdmmp_private.h"
  30
  31 #define _DMMP_SHOW_PGS_CMD "show groups raw format %w|%g|%p|%t|%s"
  32 #define _DMMP_SHOW_PG_INDEX_WWID        0
  33 #define _DMMP_SHOW_PG_INDEX_PG_ID       1
  34 #define _DMMP_SHOW_PG_INDEX_PRI         2
  35 #define _DMMP_SHOW_PG_INDEX_STATUS      3
  36 #define _DMMP_SHOW_PG_INDEX_SELECTOR    4
  37
  38 struct dmmp_path_group {
  39         uint32_t id;
  40         /* ^ pgindex of struct path, will be used for path group switch */
  41         uint32_t status;
  42         uint32_t priority;
  43         char *selector;
  44         uint32_t dmmp_p_count;
  45         struct dmmp_path **dmmp_ps;
  46 };
  47
  48 static const struct _num_str_conv _DMMP_PATH_GROUP_STATUS_CONV[] = {
  49         {DMMP_PATH_GROUP_STATUS_UNKNOWN, "undef"},
  50         {DMMP_PATH_GROUP_STATUS_ACTIVE, "active"},
  51         {DMMP_PATH_GROUP_STATUS_DISABLED, "disabled"},
  52         {DMMP_PATH_GROUP_STATUS_ENABLED, "enabled"},
  53 };
  54
  55 _dmmp_str_func_gen(dmmp_path_group_status_str, uint32_t, pg_status,
  56                    _DMMP_PATH_GROUP_STATUS_CONV);
  57 _dmmp_str_conv_func_gen(_dmmp_path_group_status_str_conv, ctx, pg_status_str,
  58                         uint32_t, DMMP_PATH_GROUP_STATUS_UNKNOWN,
  59                         _DMMP_PATH_GROUP_STATUS_CONV);
  60
  61 _dmmp_getter_func_gen(dmmp_path_group_id_get, struct dmmp_path_group, dmmp_pg,
  62                       id, uint32_t);
  63 _dmmp_getter_func_gen(dmmp_path_group_status_get, struct dmmp_path_group,
  64                       dmmp_pg, status, uint32_t);
  65 _dmmp_getter_func_gen(dmmp_path_group_priority_get, struct dmmp_path_group,
  66                       dmmp_pg, priority, uint32_t);
  67 _dmmp_getter_func_gen(dmmp_path_group_selector_get, struct dmmp_path_group,
  68                       dmmp_pg, selector, const char *);
  69 _dmmp_array_free_func_gen(_dmmp_path_group_array_free, struct dmmp_path_group,
  70                           _dmmp_path_group_free);
  71
  72
  73 struct dmmp_path_group *_dmmp_path_group_new(void)
  74 {
  75         struct dmmp_path_group *dmmp_pg = NULL;
  76
  77         dmmp_pg = (struct dmmp_path_group *)
  78                 malloc(sizeof(struct dmmp_path_group));
  79
  80         if (dmmp_pg != NULL) {
  81                 dmmp_pg->id = _DMMP_PATH_GROUP_ID_UNKNOWN;
  82                 dmmp_pg->status = DMMP_PATH_GROUP_STATUS_UNKNOWN;
  83                 dmmp_pg->priority = 0;
  84                 dmmp_pg->selector = NULL;
  85                 dmmp_pg->dmmp_p_count = 0;
  86                 dmmp_pg->dmmp_ps = NULL;
  87         }
  88         return dmmp_pg;
  89 }
  90 int _dmmp_path_group_update(struct dmmp_context *ctx,
  91                             struct dmmp_path_group *dmmp_pg,
  92                             json_object *j_obj_pg)
  93 {
  94         int rc = DMMP_OK;
  95         uint32_t id = 0;
  96         int priority_int = -1 ;
  97         const char *status_str = NULL;
  98         const char *selector = NULL;
  99         struct array_list *ar_ps = NULL;
 100         int ar_ps_len = -1;
 101         uint32_t i = 0;
 102         struct dmmp_path *dmmp_p = NULL;
 103
 104         assert(ctx != NULL);
 105         assert(dmmp_pg != NULL);
 106         assert(j_obj_pg != NULL);
 107
 108         _json_obj_get_value(ctx, j_obj_pg, status_str, "dm_st",
 109                             json_type_string, json_object_get_string, rc, out);
 110
 111         _json_obj_get_value(ctx, j_obj_pg, selector, "selector",
 112                             json_type_string, json_object_get_string, rc, out);
 113
 114         _json_obj_get_value(ctx, j_obj_pg, priority_int, "pri",
 115                             json_type_int, json_object_get_int, rc, out);
 116
 117         _json_obj_get_value(ctx, j_obj_pg, id, "group",
 118                             json_type_int, json_object_get_int, rc, out);
 119
 120         dmmp_pg->priority = (priority_int <= 0) ? 0 : priority_int & UINT32_MAX;
 121
 122         _dmmp_null_or_empty_str_check(ctx, status_str, rc, out);
 123         _dmmp_null_or_empty_str_check(ctx, selector, rc, out);
 124
 125         dmmp_pg->selector = strdup(selector);
 126         _dmmp_alloc_null_check(ctx, dmmp_pg->selector, rc, out);
 127
 128         dmmp_pg->id = id;
 129
 130         if (dmmp_pg->id == _DMMP_PATH_GROUP_ID_UNKNOWN) {
 131                 rc = DMMP_ERR_BUG;
 132                 _error(ctx, "BUG: Got unknown(%d) path group ID",
 133                        _DMMP_PATH_GROUP_ID_UNKNOWN);
 134                 goto out;
 135         }
 136
 137         dmmp_pg->status = _dmmp_path_group_status_str_conv(ctx, status_str);
 138
 139         _json_obj_get_value(ctx, j_obj_pg, ar_ps, "paths",
 140                             json_type_array, json_object_get_array, rc, out);
 141
 142         ar_ps_len = array_list_length(ar_ps);
 143         if (ar_ps_len < 0) {
 144                 rc = DMMP_ERR_BUG;
 145                 _error(ctx, "BUG: Got negative length for ar_ps");
 146                 goto out;
 147         }
 148         else if (ar_ps_len == 0)
 149                 goto out;
 150         else
 151                 dmmp_pg->dmmp_p_count = ar_ps_len & UINT32_MAX;
 152
 153         dmmp_pg->dmmp_ps = (struct dmmp_path **)
 154                 malloc(sizeof(struct dmmp_path *) * dmmp_pg->dmmp_p_count);
 155         _dmmp_alloc_null_check(ctx, dmmp_pg->dmmp_ps, rc, out);
 156         for (; i < dmmp_pg->dmmp_p_count; ++i)
 157                 dmmp_pg->dmmp_ps[i] = NULL;
 158
 159         for (i = 0; i < dmmp_pg->dmmp_p_count; ++i) {
 160                 dmmp_p = _dmmp_path_new();
 161                 _dmmp_alloc_null_check(ctx, dmmp_p, rc, out);
 162                 dmmp_pg->dmmp_ps[i] = dmmp_p;
 163                 _good(_dmmp_path_update(ctx, dmmp_p,
 164                                         array_list_get_idx(ar_ps, i)),
 165                       rc, out);
 166         }
 167
 168         _debug(ctx, "Got path group id: %" PRIu32 "", dmmp_pg->id);
 169         _debug(ctx, "Got path group priority: %" PRIu32 "", dmmp_pg->priority);
 170         _debug(ctx, "Got path group status: %s(%" PRIu32 ")",
 171                dmmp_path_group_status_str(dmmp_pg->status), dmmp_pg->status);
 172         _debug(ctx, "Got path group selector: '%s'", dmmp_pg->selector);
 173
 174 out:
 175         if (rc != DMMP_OK)
 176                 _dmmp_path_group_free(dmmp_pg);
 177         return rc;
 178 }
 179
 180 void _dmmp_path_group_free(struct dmmp_path_group *dmmp_pg)
 181 {
 182         uint32_t i = 0;
 183
 184         if (dmmp_pg == NULL)
 185                 return;
 186
 187         free((char *) dmmp_pg->selector);
 188
 189         if (dmmp_pg->dmmp_ps != NULL) {
 190                 for (i = 0; i < dmmp_pg->dmmp_p_count; ++i) {
 191                         _dmmp_path_free(dmmp_pg->dmmp_ps[i]);
 192                 }
 193                 free(dmmp_pg->dmmp_ps);
 194         }
 195         free(dmmp_pg);
 196 }
 197
 198 void dmmp_path_array_get(struct dmmp_path_group *mp_pg,
 199                          struct dmmp_path ***mp_paths,
 200                          uint32_t *dmmp_p_count)
 201 {
 202         assert(mp_pg != NULL);
 203         assert(mp_paths != NULL);
 204         assert(dmmp_p_count != NULL);
 205
 206         *mp_paths = mp_pg->dmmp_ps;
 207         *dmmp_p_count = mp_pg->dmmp_p_count;
 208 }