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, Whamcloud, Inc.
  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 #ifndef __KERNEL__
  40 # include <liblustre.h>
  41 #endif
  42 #include <obd.h>
  43 #include <obd_support.h>
  44 #include <obd_class.h>
  45 #include <lustre_lib.h>
  46 #include <lustre_ha.h>
  47 #include <lustre_net.h>
  48 #include <lprocfs_status.h>
  49
  50 #define NIDS_MAX        32
  51
  52 struct uuid_nid_data {
  53         cfs_list_t       un_list;
  54         struct obd_uuid  un_uuid;
  55         int              un_nid_count;
  56         lnet_nid_t       un_nids[NIDS_MAX];
  57 };
  58
  59 /* FIXME: This should probably become more elegant than a global linked list */
  60 static cfs_list_t       g_uuid_list;
  61 static spinlock_t       g_uuid_lock;
  62
  63 void class_init_uuidlist(void)
  64 {
  65         CFS_INIT_LIST_HEAD(&g_uuid_list);
  66         spin_lock_init(&g_uuid_lock);
  67 }
  68
  69 void class_exit_uuidlist(void)
  70 {
  71         /* delete all */
  72         class_del_uuid(NULL);
  73 }
  74
  75 int lustre_uuid_to_peer(const char *uuid, lnet_nid_t *peer_nid, int index)
  76 {
  77         struct uuid_nid_data *data;
  78         struct obd_uuid tmp;
  79         int rc = -ENOENT;
  80
  81         obd_str2uuid(&tmp, uuid);
  82         spin_lock(&g_uuid_lock);
  83         cfs_list_for_each_entry(data, &g_uuid_list, un_list) {
  84                 if (obd_uuid_equals(&data->un_uuid, &tmp)) {
  85                         if (index >= data->un_nid_count)
  86                                 break;
  87
  88                         rc = 0;
  89                         *peer_nid = data->un_nids[index];
  90                         break;
  91                 }
  92         }
  93         spin_unlock(&g_uuid_lock);
  94         return rc;
  95 }
  96 EXPORT_SYMBOL(lustre_uuid_to_peer);
  97
  98 /* Add a nid to a niduuid.  Multiple nids can be added to a single uuid;
  99    LNET will choose the best one. */
 100 int class_add_uuid(const char *uuid, __u64 nid)
 101 {
 102         struct uuid_nid_data *data, *entry;
 103         int found = 0;
 104
 105         LASSERT(nid != 0);  /* valid newconfig NID is never zero */
 106
 107         if (strlen(uuid) > UUID_MAX - 1)
 108                 return -EOVERFLOW;
 109
 110         OBD_ALLOC_PTR(data);
 111         if (data == NULL)
 112                 return -ENOMEM;
 113
 114         obd_str2uuid(&data->un_uuid, uuid);
 115         data->un_nids[0] = nid;
 116         data->un_nid_count = 1;
 117
 118         spin_lock(&g_uuid_lock);
 119         cfs_list_for_each_entry(entry, &g_uuid_list, un_list) {
 120                 if (obd_uuid_equals(&entry->un_uuid, &data->un_uuid)) {
 121                         int i;
 122
 123                         found = 1;
 124                         for (i = 0; i < entry->un_nid_count; i++)
 125                                 if (nid == entry->un_nids[i])
 126                                         break;
 127
 128                         if (i == entry->un_nid_count) {
 129                                 LASSERT(entry->un_nid_count < NIDS_MAX);
 130                                 entry->un_nids[entry->un_nid_count++] = nid;
 131                         }
 132                         break;
 133                 }
 134         }
 135         if (!found)
 136                 cfs_list_add(&data->un_list, &g_uuid_list);
 137         spin_unlock(&g_uuid_lock);
 138
 139         if (found) {
 140                 CDEBUG(D_INFO, "found uuid %s %s cnt=%d\n", uuid,
 141                        libcfs_nid2str(nid), entry->un_nid_count);
 142                 OBD_FREE(data, sizeof(*data));
 143         } else {
 144                 CDEBUG(D_INFO, "add uuid %s %s\n", uuid, libcfs_nid2str(nid));
 145         }
 146         return 0;
 147 }
 148 EXPORT_SYMBOL(class_add_uuid);
 149
 150 /* Delete the nids for one uuid if specified, otherwise delete all */
 151 int class_del_uuid(const char *uuid)
 152 {
 153         CFS_LIST_HEAD(deathrow);
 154         struct uuid_nid_data *data;
 155
 156         spin_lock(&g_uuid_lock);
 157         if (uuid != NULL) {
 158                 struct obd_uuid tmp;
 159
 160                 obd_str2uuid(&tmp, uuid);
 161                 cfs_list_for_each_entry(data, &g_uuid_list, un_list) {
 162                         if (obd_uuid_equals(&data->un_uuid, &tmp)) {
 163                                 cfs_list_move(&data->un_list, &deathrow);
 164                                 break;
 165                         }
 166                 }
 167         } else
 168                 cfs_list_splice_init(&g_uuid_list, &deathrow);
 169         spin_unlock(&g_uuid_lock);
 170
 171         if (uuid != NULL && cfs_list_empty(&deathrow)) {
 172                 CDEBUG(D_INFO, "Try to delete a non-existent uuid %s\n", uuid);
 173                 return -EINVAL;
 174         }
 175
 176         while (!cfs_list_empty(&deathrow)) {
 177                 data = cfs_list_entry(deathrow.next, struct uuid_nid_data,
 178                                       un_list);
 179                 cfs_list_del(&data->un_list);
 180
 181                 CDEBUG(D_INFO, "del uuid %s %s/%d\n",
 182                        obd_uuid2str(&data->un_uuid),
 183                        libcfs_nid2str(data->un_nids[0]),
 184                        data->un_nid_count);
 185
 186                 OBD_FREE(data, sizeof(*data));
 187         }
 188
 189         return 0;
 190 }
 191
 192 /* check if @nid exists in nid list of @uuid */
 193 int class_check_uuid(struct obd_uuid *uuid, __u64 nid)
 194 {
 195         struct uuid_nid_data *entry;
 196         int found = 0;
 197         ENTRY;
 198
 199         CDEBUG(D_INFO, "check if uuid %s has %s.\n",
 200                obd_uuid2str(uuid), libcfs_nid2str(nid));
 201
 202         spin_lock(&g_uuid_lock);
 203         cfs_list_for_each_entry(entry, &g_uuid_list, un_list) {
 204                 int i;
 205
 206                 if (!obd_uuid_equals(&entry->un_uuid, uuid))
 207                         continue;
 208
 209                 /* found the uuid, check if it has @nid */
 210                 for (i = 0; i < entry->un_nid_count; i++) {
 211                         if (entry->un_nids[i] == nid) {
 212                                 found = 1;
 213                                 break;
 214                         }
 215                 }
 216                 break;
 217         }
 218         spin_unlock(&g_uuid_lock);
 219         RETURN(found);
 220 }
 221 EXPORT_SYMBOL(class_check_uuid);