libdmmp/libdmmp_mp.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 <stdio.h>
  23 #include <inttypes.h>
  24 #include <string.h>
  25 #include <errno.h>
  26 #include <assert.h>
  27 #include <json.h>
  28
  29 #include "libdmmp/libdmmp.h"
  30 #include "libdmmp_private.h"
  31
  32 struct dmmp_mpath {
  33         char *wwid;
  34         char *alias;
  35         uint32_t dmmp_pg_count;
  36         struct dmmp_path_group **dmmp_pgs;
  37         char *kdev_name;
  38 };
  39
  40 _dmmp_getter_func_gen(dmmp_mpath_name_get, struct dmmp_mpath, dmmp_mp,
  41                       alias, const char *);
  42 _dmmp_getter_func_gen(dmmp_mpath_wwid_get, struct dmmp_mpath, dmmp_mp,
  43                       wwid, const char *);
  44 _dmmp_getter_func_gen(dmmp_mpath_kdev_name_get, struct dmmp_mpath, dmmp_mp,
  45                       kdev_name, const char *);
  46
  47 struct dmmp_mpath *_dmmp_mpath_new(void)
  48 {
  49         struct dmmp_mpath *dmmp_mp = NULL;
  50
  51         dmmp_mp = (struct dmmp_mpath *) malloc(sizeof(struct dmmp_mpath));
  52
  53         if (dmmp_mp != NULL) {
  54                 dmmp_mp->wwid = NULL;
  55                 dmmp_mp->alias = NULL;
  56                 dmmp_mp->dmmp_pg_count = 0;
  57                 dmmp_mp->dmmp_pgs = NULL;
  58         }
  59         return dmmp_mp;
  60 }
  61
  62 int _dmmp_mpath_update(struct dmmp_context *ctx, struct dmmp_mpath *dmmp_mp,
  63                        json_object *j_obj_map)
  64 {
  65         int rc = DMMP_OK;
  66         const char *wwid = NULL;
  67         const char *alias = NULL;
  68         struct array_list *ar_pgs = NULL;
  69         int ar_pgs_len = -1;
  70         uint32_t i = 0;
  71         struct dmmp_path_group *dmmp_pg = NULL;
  72         const char *kdev_name = NULL;
  73
  74         assert(ctx != NULL);
  75         assert(dmmp_mp != NULL);
  76         assert(j_obj_map != NULL);
  77
  78         _json_obj_get_value(ctx, j_obj_map, wwid, "uuid", json_type_string,
  79                             json_object_get_string, rc, out);
  80         _json_obj_get_value(ctx, j_obj_map, alias, "name", json_type_string,
  81                             json_object_get_string, rc, out);
  82         _json_obj_get_value(ctx, j_obj_map, kdev_name, "sysfs",
  83                             json_type_string, json_object_get_string, rc, out);
  84
  85         _dmmp_null_or_empty_str_check(ctx, wwid, rc, out);
  86         _dmmp_null_or_empty_str_check(ctx, alias, rc, out);
  87
  88         dmmp_mp->wwid = strdup(wwid);
  89         _dmmp_alloc_null_check(ctx, dmmp_mp->wwid, rc, out);
  90         dmmp_mp->alias = strdup(alias);
  91         _dmmp_alloc_null_check(ctx, dmmp_mp->alias, rc, out);
  92         dmmp_mp->kdev_name = strdup(kdev_name);
  93         _dmmp_alloc_null_check(ctx, dmmp_mp->kdev_name, rc, out);
  94
  95         _json_obj_get_value(ctx, j_obj_map, ar_pgs, "path_groups",
  96                             json_type_array, json_object_get_array, rc, out);
  97         ar_pgs_len = array_list_length(ar_pgs);
  98         if (ar_pgs_len < 0) {
  99                 rc = DMMP_ERR_BUG;
 100                 _error(ctx, "BUG: Got negative length for ar_pgs");
 101                 goto out;
 102         }
 103         else if (ar_pgs_len == 0)
 104                 goto out;
 105         else
 106                 dmmp_mp->dmmp_pg_count = ar_pgs_len & UINT32_MAX;
 107
 108         dmmp_mp->dmmp_pgs = (struct dmmp_path_group **)
 109                 malloc(sizeof(struct dmmp_path_group *) *
 110                        dmmp_mp->dmmp_pg_count);
 111         _dmmp_alloc_null_check(ctx, dmmp_mp->dmmp_pgs, rc, out);
 112         for (; i < dmmp_mp->dmmp_pg_count; ++i)
 113                 dmmp_mp->dmmp_pgs[i] = NULL;
 114
 115         for (i = 0; i < dmmp_mp->dmmp_pg_count; ++i) {
 116                 dmmp_pg = _dmmp_path_group_new();
 117                 _dmmp_alloc_null_check(ctx, dmmp_pg, rc, out);
 118                 dmmp_mp->dmmp_pgs[i] = dmmp_pg;
 119                 _good(_dmmp_path_group_update(ctx, dmmp_pg,
 120                                               array_list_get_idx(ar_pgs, i)),
 121                       rc, out);
 122         }
 123
 124         _debug(ctx, "Got mpath wwid: '%s', alias: '%s'", dmmp_mp->wwid,
 125                dmmp_mp->alias);
 126
 127 out:
 128         if (rc != DMMP_OK)
 129                 _dmmp_mpath_free(dmmp_mp);
 130         return rc;
 131 }
 132
 133 void _dmmp_mpath_free(struct dmmp_mpath *dmmp_mp)
 134 {
 135         if (dmmp_mp == NULL)
 136                 return ;
 137
 138         free((char *) dmmp_mp->alias);
 139         free((char *) dmmp_mp->wwid);
 140         free((char *) dmmp_mp->kdev_name);
 141
 142         if (dmmp_mp->dmmp_pgs != NULL)
 143                 _dmmp_path_group_array_free(dmmp_mp->dmmp_pgs,
 144                                             dmmp_mp->dmmp_pg_count);
 145
 146         free(dmmp_mp);
 147 }
 148
 149 void dmmp_path_group_array_get(struct dmmp_mpath *dmmp_mp,
 150                                struct dmmp_path_group ***dmmp_pgs,
 151                                uint32_t *dmmp_pg_count)
 152 {
 153         assert(dmmp_mp != NULL);
 154         assert(dmmp_pgs != NULL);
 155         assert(dmmp_pg_count != NULL);
 156
 157         *dmmp_pgs = dmmp_mp->dmmp_pgs;
 158         *dmmp_pg_count = dmmp_mp->dmmp_pg_count;
 159 }