lustre/ptlbd/client.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   5  *   Author: Zach Brown <zab@clusterfs.com>
   6  *
   7  *   This file is part of Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/version.h>
  24 #include <linux/module.h>
  25 #include <linux/fs.h>
  26
  27 #define DEBUG_SUBSYSTEM S_PTLBD
  28
  29 #include <linux/obd_support.h>
  30 #include <linux/obd_class.h>
  31 #include <linux/lustre_debug.h>
  32 #include <linux/lprocfs_status.h>
  33 #include <linux/obd_ptlbd.h>
  34
  35 static int ptlbd_cl_setup(struct obd_device *obd, obd_count len, void *buf)
  36 {
  37         struct ptlbd_obd *ptlbd = &obd->u.ptlbd;
  38         struct lprocfs_static_vars lvars;
  39         struct obd_import *imp;
  40         struct lustre_cfg* lcfg = buf;
  41         ENTRY;
  42
  43         if (ptlbd->bd_import != NULL)
  44                 RETURN(-EALREADY);
  45
  46         if (lcfg->lcfg_inllen1 < 1) {
  47                 CERROR("requires a PTLBD server UUID\n");
  48                 RETURN(-EINVAL);
  49         }
  50
  51         if (lcfg->lcfg_inllen1 > 37) {
  52                 CERROR("PTLBD server UUID must be less than 38 characters\n");
  53                 RETURN(-EINVAL);
  54         }
  55
  56         obd_str2uuid(&ptlbd->bd_server_uuid, lcfg->lcfg_inlbuf1);
  57
  58         /*
  59          * from client_obd_connect.. *shrug*
  60          */
  61         imp = ptlbd->bd_import = class_new_import();
  62         imp->imp_connection = ptlrpc_uuid_to_connection(&ptlbd->bd_server_uuid);
  63         if (!imp->imp_connection) {
  64                 class_destroy_import(imp);
  65                 class_import_put(imp);
  66                 RETURN(-ENOENT);
  67         }
  68         imp->imp_state = LUSTRE_IMP_FULL;
  69
  70         ptlrpc_init_client(PTLBD_REQUEST_PORTAL, PTLBD_REPLY_PORTAL,
  71                         "ptlbd", &ptlbd->bd_client);
  72         imp->imp_client = &ptlbd->bd_client;
  73         imp->imp_obd = obd;
  74         memcpy(imp->imp_target_uuid.uuid, lcfg->lcfg_inlbuf1,
  75                lcfg->lcfg_inllen1);
  76         ptlbd_blk_register(ptlbd);
  77
  78         lprocfs_init_vars(ptlbd_cl, &lvars);
  79         lprocfs_obd_setup(obd, lvars.obd_vars);
  80
  81         RETURN(0);
  82 }
  83
  84 static int ptlbd_cl_cleanup(struct obd_device *obd, int flags)
  85 {
  86         struct ptlbd_obd *ptlbd = &obd->u.ptlbd;
  87         struct obd_import *imp;
  88         ENTRY;
  89
  90         if ((!ptlbd) || (!(imp = ptlbd->bd_import)))
  91                 RETURN(-ENOENT);
  92
  93         if (!imp->imp_connection)
  94                 RETURN(-ENOENT);
  95
  96         lprocfs_obd_cleanup(obd);
  97
  98         ptlrpc_cleanup_client(imp);
  99         ptlrpc_put_connection(imp->imp_connection);
 100
 101         class_destroy_import(imp);
 102         class_import_put(imp);
 103
 104         RETURN(0);
 105 }
 106
 107
 108 /* modelled after ptlrpc_import_connect() */
 109 int ptlbd_cl_connect(struct lustre_handle *conn, struct obd_device *obd,
 110                      struct obd_uuid *target_uuid)
 111 {
 112         struct ptlbd_obd *ptlbd = &obd->u.ptlbd;
 113         struct obd_import *imp = ptlbd->bd_import;
 114         struct obd_export *exp;
 115         struct ptlrpc_request *request;
 116         int     rc, size[] = {sizeof(imp->imp_target_uuid),
 117                               sizeof(obd->obd_uuid),
 118                               sizeof(*conn)};
 119         char *tmp[] = {imp->imp_target_uuid.uuid,
 120                        obd->obd_uuid.uuid,
 121                        (char*)conn};
 122         ENTRY;
 123
 124         if (!conn || !obd || !target_uuid)
 125                 RETURN(-EINVAL);
 126
 127         rc = class_connect(conn, obd, target_uuid);
 128         if (rc)
 129                 RETURN(rc);
 130         exp = class_conn2export(conn);
 131
 132         request = ptlrpc_prep_req(imp, PTLBD_CONNECT, 3, size, tmp);
 133         if (!request)
 134                 GOTO(out_disco, rc = -ENOMEM);
 135         request->rq_send_state = LUSTRE_IMP_NEW;
 136         request->rq_replen = lustre_msg_size(0, NULL);
 137
 138         imp->imp_dlm_handle = *conn;
 139
 140         imp->imp_state = LUSTRE_IMP_NEW;
 141         rc = ptlrpc_queue_wait(request);
 142         if (rc)
 143                 GOTO(out_req, rc);
 144
 145         exp->exp_connection = ptlrpc_connection_addref(imp->imp_connection);
 146
 147         imp->imp_state = LUSTRE_IMP_FULL;
 148         imp->imp_remote_handle = request->rq_repmsg->handle;
 149
 150 out_req:
 151         ptlrpc_req_finished(request);
 152 out_disco:
 153         if (rc)
 154                 class_disconnect(exp, 0);
 155         class_export_put(exp);
 156         RETURN(rc);
 157 }
 158
 159
 160 /* modelled after ptlrpc_import_disconnect() */
 161 int ptlbd_cl_disconnect(struct obd_export *exp, int failover)
 162 {
 163         struct obd_device *obd = exp->exp_obd;
 164         struct ptlbd_obd *ptlbd = &obd->u.ptlbd;
 165         struct obd_import *imp = ptlbd->bd_import;
 166         struct ptlrpc_request *request;
 167         int     rc, err;
 168         ENTRY;
 169
 170         if (!obd)
 171                 RETURN(-EINVAL);
 172
 173         request = ptlrpc_prep_req(imp, PTLBD_DISCONNECT, 0, NULL, NULL);
 174         if (!request)
 175                 GOTO(out_req, rc = -ENOMEM);
 176
 177         request->rq_replen = lustre_msg_size(0, NULL);
 178         request->rq_send_state = LUSTRE_IMP_FULL;
 179
 180         rc = ptlrpc_queue_wait(request);
 181
 182 out_req:
 183         if (request)
 184                 ptlrpc_req_finished(request);
 185         err = class_disconnect(exp, 0);
 186         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
 187         if (!rc && err)
 188                 rc = err;
 189         RETURN(rc);
 190 }
 191
 192
 193 static struct obd_ops ptlbd_cl_obd_ops = {
 194         .o_owner        = THIS_MODULE,
 195         .o_setup        = ptlbd_cl_setup,
 196         .o_cleanup      = ptlbd_cl_cleanup,
 197         .o_connect      = ptlbd_cl_connect,
 198         .o_disconnect   = ptlbd_cl_disconnect,
 199 };
 200
 201 static struct lprocfs_vars lprocfs_obd_vars[] = { {0} };
 202 static struct lprocfs_vars lprocfs_module_vars[] = { {0} };
 203 LPROCFS_INIT_VARS(ptlbd_cl, lprocfs_module_vars, lprocfs_obd_vars)
 204
 205 int ptlbd_cl_init(void)
 206 {
 207         struct lprocfs_static_vars lvars;
 208
 209         lprocfs_init_vars(ptlbd_cl,&lvars);
 210         return class_register_type(&ptlbd_cl_obd_ops, lvars.module_vars,
 211                                    OBD_PTLBD_CL_DEVICENAME);
 212 }
 213
 214 void ptlbd_cl_exit(void)
 215 {
 216         class_unregister_type(OBD_PTLBD_CL_DEVICENAME);
 217 }
 218
 219
 220
 221 int ptlbd_do_connect(struct ptlbd_obd *ptlbd)
 222 {
 223         int     rc;
 224         struct obd_device       *obd = ptlbd->bd_import->imp_obd;
 225         struct lustre_handle conn;
 226         ENTRY;
 227
 228         memset(&conn, 0, sizeof(conn));
 229         rc = obd_connect(&conn, obd, &ptlbd->bd_server_uuid);
 230         if (rc < 0)
 231                 RETURN(rc);
 232         ptlbd->bd_exp = class_conn2export(&conn);
 233         RETURN(rc);
 234 }
 235
 236
 237 int ptlbd_do_disconnect(struct ptlbd_obd *ptlbd)
 238 {
 239         int     rc;
 240         ENTRY;
 241
 242         rc = obd_disconnect(ptlbd->bd_exp, 0);
 243         RETURN(rc);
 244 }
 245