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_attach(struct obd_device *obd, obd_count len, void *buf)
  36 {
  37         struct lprocfs_static_vars lvars;
  38
  39         lprocfs_init_vars(ptlbd_cl, &lvars);
  40         return lprocfs_obd_attach(obd, lvars.obd_vars);
  41 }
  42
  43 static int ptlbd_cl_detach(struct obd_device *obd)
  44 {
  45         return lprocfs_obd_detach(obd);
  46 }
  47
  48 static int ptlbd_cl_setup(struct obd_device *obd, obd_count len, void *buf)
  49 {
  50         struct ptlbd_obd *ptlbd = &obd->u.ptlbd;
  51         struct lustre_cfg* lcfg = buf;
  52         struct obd_import *imp;
  53         ENTRY;
  54
  55         if (ptlbd->bd_import != NULL)
  56                 RETURN(-EALREADY);
  57
  58         if (lcfg->lcfg_inllen1 < 1) {
  59                 CERROR("requires a PTLBD server UUID\n");
  60                 RETURN(-EINVAL);
  61         }
  62
  63         if (lcfg->lcfg_inllen1 > 37) {
  64                 CERROR("PTLBD server UUID must be less than 38 characters\n");
  65                 RETURN(-EINVAL);
  66         }
  67
  68         obd_str2uuid(&ptlbd->bd_server_uuid, lcfg->lcfg_inlbuf1);
  69
  70         /*
  71          * from client_obd_connect.. *shrug*
  72          */
  73         imp = ptlbd->bd_import = class_new_import();
  74         imp->imp_connection = ptlrpc_uuid_to_connection(&ptlbd->bd_server_uuid);
  75         if (!imp->imp_connection) {
  76                 class_destroy_import(imp);
  77                 class_import_put(imp);
  78                 RETURN(-ENOENT);
  79         }
  80         imp->imp_state = LUSTRE_IMP_FULL;
  81
  82         ptlrpc_init_client(PTLBD_REQUEST_PORTAL, PTLBD_REPLY_PORTAL,
  83                         "ptlbd", &ptlbd->bd_client);
  84         imp->imp_client = &ptlbd->bd_client;
  85         imp->imp_obd = obd;
  86         memcpy(imp->imp_target_uuid.uuid, lcfg->lcfg_inlbuf1,
  87                lcfg->lcfg_inllen1);
  88         ptlbd_blk_register(ptlbd);
  89
  90         RETURN(0);
  91 }
  92
  93 static int ptlbd_cl_cleanup(struct obd_device *obd, int flags)
  94 {
  95         struct ptlbd_obd *ptlbd = &obd->u.ptlbd;
  96         struct obd_import *imp;
  97         ENTRY;
  98
  99         if ((!ptlbd) || (!(imp = ptlbd->bd_import)))
 100                 RETURN(-ENOENT);
 101
 102         if (!imp->imp_connection)
 103                 RETURN(-ENOENT);
 104
 105         ptlrpc_cleanup_client(imp);
 106         ptlrpc_put_connection(imp->imp_connection);
 107
 108         class_destroy_import(imp);
 109         class_import_put(imp);
 110
 111         RETURN(0);
 112 }
 113
 114 /* modelled after ptlrpc_import_connect() */
 115 int ptlbd_cl_connect(struct lustre_handle *conn, struct obd_device *obd,
 116                      struct obd_uuid *target_uuid, unsigned long connect_flags)
 117 {
 118         struct ptlbd_obd *ptlbd = &obd->u.ptlbd;
 119         struct obd_import *imp = ptlbd->bd_import;
 120         struct obd_export *exp;
 121         struct ptlrpc_request *request;
 122         int     rc, size[] = {sizeof(imp->imp_target_uuid),
 123                               sizeof(obd->obd_uuid),
 124                               sizeof(*conn)};
 125         char *tmp[] = {imp->imp_target_uuid.uuid,
 126                        obd->obd_uuid.uuid,
 127                        (char*)conn};
 128         ENTRY;
 129
 130         if (!conn || !obd || !target_uuid)
 131                 RETURN(-EINVAL);
 132
 133         rc = class_connect(conn, obd, target_uuid);
 134         if (rc)
 135                 RETURN(rc);
 136         exp = class_conn2export(conn);
 137
 138         request = ptlrpc_prep_req(imp, PTLBD_CONNECT, 3, size, tmp);
 139         if (!request)
 140                 GOTO(out_disco, rc = -ENOMEM);
 141         request->rq_send_state = LUSTRE_IMP_NEW;
 142         request->rq_replen = lustre_msg_size(0, NULL);
 143
 144         imp->imp_dlm_handle = *conn;
 145
 146         imp->imp_state = LUSTRE_IMP_NEW;
 147         rc = ptlrpc_queue_wait(request);
 148         if (rc)
 149                 GOTO(out_req, rc);
 150
 151         exp->exp_connection = ptlrpc_connection_addref(imp->imp_connection);
 152
 153         imp->imp_state = LUSTRE_IMP_FULL;
 154         imp->imp_remote_handle = request->rq_repmsg->handle;
 155
 156 out_req:
 157         ptlrpc_req_finished(request);
 158 out_disco:
 159         if (rc)
 160                 class_disconnect(exp, 0);
 161         class_export_put(exp);
 162         RETURN(rc);
 163 }
 164
 165
 166 /* modelled after ptlrpc_import_disconnect() */
 167 int ptlbd_cl_disconnect(struct obd_export *exp, int failover)
 168 {
 169         struct obd_device *obd = exp->exp_obd;
 170         struct ptlbd_obd *ptlbd = &obd->u.ptlbd;
 171         struct obd_import *imp = ptlbd->bd_import;
 172         struct ptlrpc_request *request;
 173         int     rc, err;
 174         ENTRY;
 175
 176         if (!obd)
 177                 RETURN(-EINVAL);
 178
 179         request = ptlrpc_prep_req(imp, PTLBD_DISCONNECT, 0, NULL, NULL);
 180         if (!request)
 181                 GOTO(out_req, rc = -ENOMEM);
 182
 183         request->rq_replen = lustre_msg_size(0, NULL);
 184         request->rq_send_state = LUSTRE_IMP_FULL;
 185
 186         rc = ptlrpc_queue_wait(request);
 187
 188 out_req:
 189         if (request)
 190                 ptlrpc_req_finished(request);
 191         err = class_disconnect(exp, 0);
 192         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
 193         if (!rc && err)
 194                 rc = err;
 195         RETURN(rc);
 196 }
 197
 198
 199 static struct obd_ops ptlbd_cl_obd_ops = {
 200         .o_owner        = THIS_MODULE,
 201         .o_attach       = ptlbd_cl_attach,
 202         .o_detach       = ptlbd_cl_detach,
 203         .o_setup        = ptlbd_cl_setup,
 204         .o_cleanup      = ptlbd_cl_cleanup,
 205         .o_connect      = ptlbd_cl_connect,
 206         .o_disconnect   = ptlbd_cl_disconnect,
 207 };
 208
 209 static struct lprocfs_vars lprocfs_obd_vars[] = { {0} };
 210 static struct lprocfs_vars lprocfs_module_vars[] = { {0} };
 211 LPROCFS_INIT_VARS(ptlbd_cl, lprocfs_module_vars, lprocfs_obd_vars)
 212
 213 int ptlbd_cl_init(void)
 214 {
 215         struct lprocfs_static_vars lvars;
 216
 217         lprocfs_init_vars(ptlbd_cl,&lvars);
 218         return class_register_type(&ptlbd_cl_obd_ops, NULL, lvars.module_vars,
 219                                    OBD_PTLBD_CL_DEVICENAME);
 220 }
 221
 222 void ptlbd_cl_exit(void)
 223 {
 224         class_unregister_type(OBD_PTLBD_CL_DEVICENAME);
 225 }
 226
 227 int ptlbd_do_connect(struct ptlbd_obd *ptlbd)
 228 {
 229         int     rc;
 230         struct obd_device       *obd = ptlbd->bd_import->imp_obd;
 231         struct lustre_handle conn;
 232         ENTRY;
 233
 234         memset(&conn, 0, sizeof(conn));
 235         rc = obd_connect(&conn, obd, &ptlbd->bd_server_uuid, 0);
 236         if (rc < 0)
 237                 RETURN(rc);
 238         ptlbd->bd_exp = class_conn2export(&conn);
 239         RETURN(rc);
 240 }
 241
 242
 243 int ptlbd_do_disconnect(struct ptlbd_obd *ptlbd)
 244 {
 245         int     rc;
 246         ENTRY;
 247
 248         rc = obd_disconnect(ptlbd->bd_exp, 0);
 249         RETURN(rc);
 250 }
 251