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_NEVENTS     1024UL
  36 #define MGMT_NBUFS       128UL
  37 #define MGMT_BUFSIZE     8192
  38 #define MGMT_MAXREQSIZE  512
  39 #define MGMT_NUM_THREADS 4
  40 #define MGMT_DEVICE_NAME "mgmt"
  41
  42 static int mgmt_initialized;
  43 static struct ptlrpc_service *mgmt_service;
  44
  45 static int mgmt_ping(struct ptlrpc_request *req)
  46 {
  47         /* handle_incoming_request will have already updated the export's
  48          * last_request_time, so we don't need to do anything else.
  49          */
  50         return lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
  51 }
  52
  53 static int mgmt_handler(struct ptlrpc_request *req)
  54 {
  55         int rc;
  56         ENTRY;
  57
  58         switch (req->rq_reqmsg->opc) {
  59         case OBD_PING:
  60                 DEBUG_REQ(D_RPCTRACE, req, "ping");
  61                 rc = mgmt_ping(req);
  62                 break;
  63         case MGMT_CONNECT:
  64                 DEBUG_REQ(D_RPCTRACE, req, "connect");
  65                 rc = target_handle_connect(req, NULL /* no recovery handler */);
  66                 break;
  67         case MGMT_DISCONNECT:
  68                 DEBUG_REQ(D_RPCTRACE, req, "disconnect");
  69                 rc = target_handle_disconnect(req);
  70                 break;
  71         default:
  72                 DEBUG_REQ(D_RPCTRACE, req, "UNKNOWN OP");
  73                 rc = -EINVAL;
  74         }
  75
  76         if (rc)
  77                 ptlrpc_error(req);
  78         else
  79                 ptlrpc_reply(req);
  80
  81         RETURN(0);
  82 }
  83
  84 static int mgmt_setup(struct obd_device *obd, obd_count len, void *buf)
  85 {
  86         int i, rc;
  87         ENTRY;
  88
  89         if (mgmt_initialized)
  90                 RETURN(-EALREADY);
  91
  92         mgmt_service = ptlrpc_init_svc(MGMT_NEVENTS, MGMT_NBUFS, MGMT_BUFSIZE,
  93                                        MGMT_MAXREQSIZE, MGMT_REQUEST_PORTAL,
  94                                        MGMT_REPLY_PORTAL, mgmt_handler,
  95                                        "mgmt", obd->obd_proc_entry);
  96         if (!mgmt_service) {
  97                 CERROR("Failed to start mgmt service\n");
  98                 RETURN(-ENOMEM);
  99         }
 100
 101         rc = ptlrpc_start_n_threads(obd, mgmt_service, MGMT_NUM_THREADS,"mgmt");
 102         if (rc)
 103                 GOTO(err, rc);
 104
 105         mgmt_initialized = 1;
 106
 107         RETURN(0);
 108 err:
 109         ptlrpc_unregister_service(mgmt_service);
 110         RETURN(rc):
 111 }
 112
 113 static int mgmt_cleanup(struct obd_device *obd, int flags)
 114 {
 115         ENTRY;
 116
 117         if (!mgmt_initialized)
 118                 RETURN(-ENOENT);
 119
 120         ptlrpc_stop_all_threads(mgmt_service);
 121         ptlrpc_unregister_service(mgmt_service);
 122
 123         mgmt_initialized = 0;
 124         RETURN(0);
 125 }
 126
 127 static struct obd_ops mgmt_obd_ops = {
 128         o_owner:      THIS_MODULE,
 129         o_setup:      mgmt_setup,
 130         o_cleanup:    mgmt_cleanup,
 131         o_connect:    class_connect,
 132         o_disconnect: class_disconnect
 133 };
 134
 135 static int __init mgmt_init(void)
 136 {
 137         int rc = class_register_type(&mgmt_obd_ops, 0, MGMT_DEVICE_NAME);
 138
 139         return rc;
 140 }
 141
 142 static void __exit mgmt_exit(void)
 143 {
 144         class_unregister_type(MGMT_DEVICE_NAME);
 145 }
 146
 147 #ifdef __KERNEL__
 148 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 149 MODULE_DESCRIPTION("Lustre monitoring service v0.1");
 150 MODULE_LICENSE("GPL");
 151
 152 module_init(mgmt_init);
 153 module_exit(mgmt_exit);
 154 #endif