kernel/drivers/staging/lustre/lustre/obdclass/lustre_peer.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_RPC
  38
  39 #include "../include/obd.h"
  40 #include "../include/obd_support.h"
  41 #include "../include/obd_class.h"
  42 #include "../include/lustre_lib.h"
  43 #include "../include/lustre_ha.h"
  44 #include "../include/lustre_net.h"
  45 #include "../include/lprocfs_status.h"
  46
  47 #define NIDS_MAX        32
  48
  49 struct uuid_nid_data {
  50         struct list_head       un_list;
  51         struct obd_uuid  un_uuid;
  52         int           un_nid_count;
  53         lnet_nid_t       un_nids[NIDS_MAX];
  54 };
  55
  56 /* FIXME: This should probably become more elegant than a global linked list */
  57 static struct list_head g_uuid_list;
  58 static spinlock_t       g_uuid_lock;
  59
  60 void class_init_uuidlist(void)
  61 {
  62         INIT_LIST_HEAD(&g_uuid_list);
  63         spin_lock_init(&g_uuid_lock);
  64 }
  65
  66 void class_exit_uuidlist(void)
  67 {
  68         /* delete all */
  69         class_del_uuid(NULL);
  70 }
  71
  72 int lustre_uuid_to_peer(const char *uuid, lnet_nid_t *peer_nid, int index)
  73 {
  74         struct uuid_nid_data *data;
  75         struct obd_uuid tmp;
  76         int rc = -ENOENT;
  77
  78         obd_str2uuid(&tmp, uuid);
  79         spin_lock(&g_uuid_lock);
  80         list_for_each_entry(data, &g_uuid_list, un_list) {
  81                 if (obd_uuid_equals(&data->un_uuid, &tmp)) {
  82                         if (index >= data->un_nid_count)
  83                                 break;
  84
  85                         rc = 0;
  86                         *peer_nid = data->un_nids[index];
  87                         break;
  88                 }
  89         }
  90         spin_unlock(&g_uuid_lock);
  91         return rc;
  92 }
  93 EXPORT_SYMBOL(lustre_uuid_to_peer);
  94
  95 /* Add a nid to a niduuid.  Multiple nids can be added to a single uuid;
  96    LNET will choose the best one. */
  97 int class_add_uuid(const char *uuid, __u64 nid)
  98 {
  99         struct uuid_nid_data *data, *entry;
 100         int found = 0;
 101
 102         LASSERT(nid != 0);  /* valid newconfig NID is never zero */
 103
 104         if (strlen(uuid) > UUID_MAX - 1)
 105                 return -EOVERFLOW;
 106
 107         OBD_ALLOC_PTR(data);
 108         if (data == NULL)
 109                 return -ENOMEM;
 110
 111         obd_str2uuid(&data->un_uuid, uuid);
 112         data->un_nids[0] = nid;
 113         data->un_nid_count = 1;
 114
 115         spin_lock(&g_uuid_lock);
 116         list_for_each_entry(entry, &g_uuid_list, un_list) {
 117                 if (obd_uuid_equals(&entry->un_uuid, &data->un_uuid)) {
 118                         int i;
 119
 120                         found = 1;
 121                         for (i = 0; i < entry->un_nid_count; i++)
 122                                 if (nid == entry->un_nids[i])
 123                                         break;
 124
 125                         if (i == entry->un_nid_count) {
 126                                 LASSERT(entry->un_nid_count < NIDS_MAX);
 127                                 entry->un_nids[entry->un_nid_count++] = nid;
 128                         }
 129                         break;
 130                 }
 131         }
 132         if (!found)
 133                 list_add(&data->un_list, &g_uuid_list);
 134         spin_unlock(&g_uuid_lock);
 135
 136         if (found) {
 137                 CDEBUG(D_INFO, "found uuid %s %s cnt=%d\n", uuid,
 138                        libcfs_nid2str(nid), entry->un_nid_count);
 139                 OBD_FREE(data, sizeof(*data));
 140         } else {
 141                 CDEBUG(D_INFO, "add uuid %s %s\n", uuid, libcfs_nid2str(nid));
 142         }
 143         return 0;
 144 }
 145 EXPORT_SYMBOL(class_add_uuid);
 146
 147 /* Delete the nids for one uuid if specified, otherwise delete all */
 148 int class_del_uuid(const char *uuid)
 149 {
 150         LIST_HEAD(deathrow);
 151         struct uuid_nid_data *data;
 152
 153         spin_lock(&g_uuid_lock);
 154         if (uuid != NULL) {
 155                 struct obd_uuid tmp;
 156
 157                 obd_str2uuid(&tmp, uuid);
 158                 list_for_each_entry(data, &g_uuid_list, un_list) {
 159                         if (obd_uuid_equals(&data->un_uuid, &tmp)) {
 160                                 list_move(&data->un_list, &deathrow);
 161                                 break;
 162                         }
 163                 }
 164         } else
 165                 list_splice_init(&g_uuid_list, &deathrow);
 166         spin_unlock(&g_uuid_lock);
 167
 168         if (uuid != NULL && list_empty(&deathrow)) {
 169                 CDEBUG(D_INFO, "Try to delete a non-existent uuid %s\n", uuid);
 170                 return -EINVAL;
 171         }
 172
 173         while (!list_empty(&deathrow)) {
 174                 data = list_entry(deathrow.next, struct uuid_nid_data,
 175                                       un_list);
 176                 list_del(&data->un_list);
 177
 178                 CDEBUG(D_INFO, "del uuid %s %s/%d\n",
 179                        obd_uuid2str(&data->un_uuid),
 180                        libcfs_nid2str(data->un_nids[0]),
 181                        data->un_nid_count);
 182
 183                 OBD_FREE(data, sizeof(*data));
 184         }
 185
 186         return 0;
 187 }
 188
 189 /* check if @nid exists in nid list of @uuid */
 190 int class_check_uuid(struct obd_uuid *uuid, __u64 nid)
 191 {
 192         struct uuid_nid_data *entry;
 193         int found = 0;
 194
 195         CDEBUG(D_INFO, "check if uuid %s has %s.\n",
 196                obd_uuid2str(uuid), libcfs_nid2str(nid));
 197
 198         spin_lock(&g_uuid_lock);
 199         list_for_each_entry(entry, &g_uuid_list, un_list) {
 200                 int i;
 201
 202                 if (!obd_uuid_equals(&entry->un_uuid, uuid))
 203                         continue;
 204
 205                 /* found the uuid, check if it has @nid */
 206                 for (i = 0; i < entry->un_nid_count; i++) {
 207                         if (entry->un_nids[i] == nid) {
 208                                 found = 1;
 209                                 break;
 210                         }
 211                 }
 212                 break;
 213         }
 214         spin_unlock(&g_uuid_lock);
 215         return found;
 216 }
 217 EXPORT_SYMBOL(class_check_uuid);