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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2012, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_RPC
  34
  35 #include <obd.h>
  36 #include <obd_support.h>
  37 #include <obd_class.h>
  38 #include <lustre_lib.h>
  39 #include <lustre_ha.h>
  40 #include <lustre_net.h>
  41 #include <lprocfs_status.h>
  42
  43 #define NIDS_MAX        32
  44
  45 struct uuid_nid_data {
  46         struct list_head        un_list;
  47         struct obd_uuid         un_uuid;
  48         int                     un_nid_count;
  49         lnet_nid_t              un_nids[NIDS_MAX];
  50 };
  51
  52 /* FIXME: This should probably become more elegant than a global linked list */
  53 static LIST_HEAD(g_uuid_list);
  54 static DEFINE_SPINLOCK(g_uuid_lock);
  55
  56 int lustre_uuid_to_peer(const char *uuid, lnet_nid_t *peer_nid, int index)
  57 {
  58         struct uuid_nid_data *data;
  59         struct obd_uuid tmp;
  60         int rc = -ENOENT;
  61
  62         obd_str2uuid(&tmp, uuid);
  63         spin_lock(&g_uuid_lock);
  64         list_for_each_entry(data, &g_uuid_list, un_list) {
  65                 if (obd_uuid_equals(&data->un_uuid, &tmp)) {
  66                         if (index >= data->un_nid_count)
  67                                 break;
  68
  69                         rc = 0;
  70                         *peer_nid = data->un_nids[index];
  71                         break;
  72                 }
  73         }
  74         spin_unlock(&g_uuid_lock);
  75         return rc;
  76 }
  77 EXPORT_SYMBOL(lustre_uuid_to_peer);
  78
  79 /* Add a nid to a niduuid.  Multiple nids can be added to a single uuid;
  80    LNET will choose the best one. */
  81 int class_add_uuid(const char *uuid, __u64 nid)
  82 {
  83         struct uuid_nid_data *data, *entry;
  84         int found = 0;
  85
  86         LASSERT(nid != 0);  /* valid newconfig NID is never zero */
  87
  88         if (strlen(uuid) > UUID_MAX - 1)
  89                 return -EOVERFLOW;
  90
  91         OBD_ALLOC_PTR(data);
  92         if (data == NULL)
  93                 return -ENOMEM;
  94
  95         obd_str2uuid(&data->un_uuid, uuid);
  96         data->un_nids[0] = nid;
  97         data->un_nid_count = 1;
  98
  99         spin_lock(&g_uuid_lock);
 100         list_for_each_entry(entry, &g_uuid_list, un_list) {
 101                 if (obd_uuid_equals(&entry->un_uuid, &data->un_uuid)) {
 102                         int i;
 103
 104                         found = 1;
 105                         for (i = 0; i < entry->un_nid_count; i++)
 106                                 if (nid == entry->un_nids[i])
 107                                         break;
 108
 109                         if (i == entry->un_nid_count) {
 110                                 LASSERT(entry->un_nid_count < NIDS_MAX);
 111                                 entry->un_nids[entry->un_nid_count++] = nid;
 112                         }
 113                         break;
 114                 }
 115         }
 116         if (!found)
 117                 list_add(&data->un_list, &g_uuid_list);
 118         spin_unlock(&g_uuid_lock);
 119
 120         if (found) {
 121                 CDEBUG(D_INFO, "found uuid %s %s cnt=%d\n", uuid,
 122                        libcfs_nid2str(nid), entry->un_nid_count);
 123                 OBD_FREE(data, sizeof(*data));
 124         } else {
 125                 CDEBUG(D_INFO, "add uuid %s %s\n", uuid, libcfs_nid2str(nid));
 126         }
 127         return 0;
 128 }
 129
 130 /* Delete the nids for one uuid if specified, otherwise delete all */
 131 int class_del_uuid(const char *uuid)
 132 {
 133         struct uuid_nid_data *data;
 134         struct list_head deathrow;
 135
 136         INIT_LIST_HEAD(&deathrow);
 137
 138         spin_lock(&g_uuid_lock);
 139         if (uuid != NULL) {
 140                 struct obd_uuid tmp;
 141
 142                 obd_str2uuid(&tmp, uuid);
 143                 list_for_each_entry(data, &g_uuid_list, un_list) {
 144                         if (obd_uuid_equals(&data->un_uuid, &tmp)) {
 145                                 list_move(&data->un_list, &deathrow);
 146                                 break;
 147                         }
 148                 }
 149         } else
 150                 list_splice_init(&g_uuid_list, &deathrow);
 151         spin_unlock(&g_uuid_lock);
 152
 153         if (uuid != NULL && list_empty(&deathrow)) {
 154                 CDEBUG(D_INFO, "Try to delete a non-existent uuid %s\n", uuid);
 155                 return -EINVAL;
 156         }
 157
 158         while (!list_empty(&deathrow)) {
 159                 data = list_entry(deathrow.next, struct uuid_nid_data,
 160                                   un_list);
 161                 list_del(&data->un_list);
 162
 163                 CDEBUG(D_INFO, "del uuid %s %s/%d\n",
 164                        obd_uuid2str(&data->un_uuid),
 165                        libcfs_nid2str(data->un_nids[0]),
 166                        data->un_nid_count);
 167
 168                 OBD_FREE(data, sizeof(*data));
 169         }
 170         return 0;
 171 }
 172
 173 /* check if @nid exists in nid list of @uuid */
 174 int class_check_uuid(struct obd_uuid *uuid, __u64 nid)
 175 {
 176         struct uuid_nid_data *entry;
 177         int found = 0;
 178         ENTRY;
 179
 180         CDEBUG(D_INFO, "check if uuid %s has %s.\n",
 181                obd_uuid2str(uuid), libcfs_nid2str(nid));
 182
 183         spin_lock(&g_uuid_lock);
 184         list_for_each_entry(entry, &g_uuid_list, un_list) {
 185                 int i;
 186
 187                 if (!obd_uuid_equals(&entry->un_uuid, uuid))
 188                         continue;
 189
 190                 /* found the uuid, check if it has @nid */
 191                 for (i = 0; i < entry->un_nid_count; i++) {
 192                         if (entry->un_nids[i] == nid) {
 193                                 found = 1;
 194                                 break;
 195                         }
 196                 }
 197                 break;
 198         }
 199         spin_unlock(&g_uuid_lock);
 200         RETURN(found);
 201 }
 202 EXPORT_SYMBOL(class_check_uuid);