lustre/mgmt/mgmt_svc.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Implementation of the management/health monitoring service.
   5  *
   6  *  Copyright (c) 2003 Cluster File Systems, Inc.
   7  *   Author: Mike Shaver <shaver@clusterfs.com>
   8  *
   9  *   This file is part of Lustre, http://www.lustre.org.
  10  *
  11  *   Lustre is free software; you can redistribute it and/or
  12  *   modify it under the terms of version 2 of the GNU General Public
  13  *   License as published by the Free Software Foundation.
  14  *
  15  *   Lustre is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with Lustre; if not, write to the Free Software
  22  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #ifndef EXPORT_SYMTAB
  26 # define EXPORT_SYMTAB
  27 #endif
  28 #define DEBUG_SUBSYSTEM S_MGMT
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31
  32 #include <linux/obd_class.h>
  33 #include <linux/lustre_net.h>
  34
  35 #define MGMT_NBUFS       128UL
  36 #define MGMT_BUFSIZE     8192
  37 #define MGMT_MAXREQSIZE  512
  38 #define MGMT_NUM_THREADS 4
  39 #define MGMT_DEVICE_NAME "mgmt"
  40
  41 static int mgmt_initialized;
  42 static struct ptlrpc_service *mgmt_service;
  43
  44 static int mgmt_ping(struct ptlrpc_request *req)
  45 {
  46         /* handle_incoming_request will have already updated the export's
  47          * last_request_time, so we don't need to do anything else.
  48          */
  49         return lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
  50 }
  51
  52 static int mgmt_msg_check_version(struct lustre_msg *msg)
  53 {
  54         if (lustre_msg_check_version(msg, LUSTRE_OBD_VERSION)) {
  55                 CERROR("bad opc %u version %08x, expecting %08x\n",
  56                        msg->opc, msg->version, LUSTRE_OBD_VERSION);
  57                 return -EINVAL;
  58         }
  59
  60         return 0;
  61 }
  62
  63 static int mgmt_handler(struct ptlrpc_request *req)
  64 {
  65         int rc;
  66         ENTRY;
  67
  68         rc = mgmt_msg_check_version(req->rq_reqmsg);
  69         if (rc) {
  70                 CERROR("MGMT drop mal-formed request\n");
  71                 RETURN(rc);
  72         }
  73
  74         switch (req->rq_reqmsg->opc) {
  75         case OBD_PING:
  76                 DEBUG_REQ(D_RPCTRACE, req, "ping");
  77                 rc = mgmt_ping(req);
  78                 break;
  79         case MGMT_CONNECT:
  80                 DEBUG_REQ(D_RPCTRACE, req, "connect");
  81                 rc = target_handle_connect(req);
  82                 break;
  83         case MGMT_DISCONNECT:
  84                 DEBUG_REQ(D_RPCTRACE, req, "disconnect");
  85                 rc = target_handle_disconnect(req);
  86                 break;
  87         default:
  88                 DEBUG_REQ(D_RPCTRACE, req, "UNKNOWN OP");
  89                 rc = -EINVAL;
  90         }
  91
  92         if (rc)
  93                 ptlrpc_error(req);
  94         else
  95                 ptlrpc_reply(req);
  96
  97         RETURN(0);
  98 }
  99
 100 static int mgmt_setup(struct obd_device *obd, obd_count len, void *buf)
 101 {
 102         int i, rc;
 103         ENTRY;
 104
 105         if (mgmt_initialized)
 106                 RETURN(-EALREADY);
 107
 108         mgmt_service =
 109                 ptlrpc_init_svc(MGMT_NBUFS, MGMT_BUFSIZE, MGMT_MAXREQSIZE,
 110                                 MGMT_REQUEST_PORTAL, MGMT_REPLY_PORTAL, 30000,
 111                                 mgmt_handler, "mgmt", obd->obd_proc_entry);
 112         if (!mgmt_service) {
 113                 CERROR("Failed to start mgmt service\n");
 114                 RETURN(-ENOMEM);
 115         }
 116
 117         rc = ptlrpc_start_n_threads(obd, mgmt_service, MGMT_NUM_THREADS,"mgmt");
 118         if (rc)
 119                 GOTO(err, rc);
 120
 121         mgmt_initialized = 1;
 122
 123         RETURN(0);
 124 err:
 125         ptlrpc_unregister_service(mgmt_service);
 126         RETURN(rc):
 127 }
 128
 129 static int mgmt_cleanup(struct obd_device *obd, int flags)
 130 {
 131         ENTRY;
 132
 133         if (!mgmt_initialized)
 134                 RETURN(-ENOENT);
 135
 136         ptlrpc_stop_all_threads(mgmt_service);
 137         ptlrpc_unregister_service(mgmt_service);
 138
 139         mgmt_initialized = 0;
 140         RETURN(0);
 141 }
 142
 143 static struct obd_ops mgmt_obd_ops = {
 144         .o_owner      = THIS_MODULE,
 145         .o_setup      = mgmt_setup,
 146         .o_cleanup    = mgmt_cleanup,
 147         .o_connect    = class_connect,
 148         .o_disconnect = class_disconnect
 149 };
 150
 151 static int __init mgmt_init(void)
 152 {
 153         int rc = class_register_type(&mgmt_obd_ops, NULL,
 154                                      0, MGMT_DEVICE_NAME);
 155
 156         return rc;
 157 }
 158
 159 static void __exit mgmt_exit(void)
 160 {
 161         class_unregister_type(MGMT_DEVICE_NAME);
 162 }
 163
 164 #ifdef __KERNEL__
 165 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 166 MODULE_DESCRIPTION("Lustre monitoring service v0.1");
 167 MODULE_LICENSE("GPL");
 168
 169 module_init(mgmt_init);
 170 module_exit(mgmt_exit);
 171 #endif