lustre/lib/l_net.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2001, 2002 Cluster File Systems, Inc.
   5  *   Author: Peter J. Braam <braam@clusterfs.com>
   6  *   Author: Phil Schwan <phil@clusterfs.com>
   7  *
   8  *   This file is part of Lustre, http://www.lustre.org.
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  *  Storage Target Handling functions
  24  *  Lustre Object Server Module (OST)
  25  *
  26  *  This server is single threaded at present (but can easily be multi
  27  *  threaded). For testing and management it is treated as an
  28  *  obd_device, although it does not export a full OBD method table
  29  *  (the requests are coming in over the wire, so object target
  30  *  modules do not have a full method table.)
  31  */
  32
  33 #define EXPORT_SYMTAB
  34 #define DEBUG_SUBSYSTEM S_OST
  35
  36 #include <linux/module.h>
  37 #include <linux/obd_ost.h>
  38 #include <linux/lustre_net.h>
  39 #include <linux/lustre_dlm.h>
  40
  41 struct client_obd *client_conn2cli(struct lustre_handle *conn)
  42 {
  43         struct obd_export *export = class_conn2export(conn);
  44         if (!export)
  45                 LBUG();
  46         return &export->exp_obd->u.cli;
  47 }
  48
  49 int client_obd_setup(struct obd_device *obddev, obd_count len, void *buf)
  50 {
  51         struct obd_ioctl_data* data = buf;
  52         int rq_portal, rp_portal;
  53         char *name;
  54         struct client_obd *mdc = &obddev->u.cli;
  55         char server_uuid[37];
  56         ENTRY;
  57
  58         if (obddev->obd_type->typ_ops->o_brw) {
  59                 rq_portal = OST_REQUEST_PORTAL;
  60                 rp_portal = OSC_REPLY_PORTAL;
  61                 name = "osc";
  62         } else {
  63                 rq_portal = MDS_REQUEST_PORTAL;
  64                 rp_portal = MDC_REPLY_PORTAL;
  65                 name = "mdc";
  66         }
  67
  68         if (data->ioc_inllen1 < 1) {
  69                 CERROR("requires a TARGET UUID\n");
  70                 RETURN(-EINVAL);
  71         }
  72
  73         if (data->ioc_inllen1 > 37) {
  74                 CERROR("client UUID must be less than 38 characters\n");
  75                 RETURN(-EINVAL);
  76         }
  77
  78         if (data->ioc_inllen2 < 1) {
  79                 CERROR("setup requires a SERVER UUID\n");
  80                 RETURN(-EINVAL);
  81         }
  82
  83         if (data->ioc_inllen2 > 37) {
  84                 CERROR("target UUID must be less than 38 characters\n");
  85                 RETURN(-EINVAL);
  86         }
  87
  88         sema_init(&mdc->cl_sem, 1);
  89         mdc->cl_conn_count = 0;
  90         memcpy(mdc->cl_target_uuid, data->ioc_inlbuf1, data->ioc_inllen1);
  91         memcpy(server_uuid, data->ioc_inlbuf2, MIN(data->ioc_inllen2,
  92                                                    sizeof(server_uuid)));
  93
  94         mdc->cl_import.imp_connection = ptlrpc_uuid_to_connection(server_uuid);
  95         if (!mdc->cl_import.imp_connection)
  96                 RETURN(-ENOENT);
  97
  98         ptlrpc_init_client(rq_portal, rp_portal, name,
  99                            &obddev->obd_ldlm_client);
 100         mdc->cl_import.imp_client = &obddev->obd_ldlm_client;
 101
 102         mdc->cl_max_mdsize = sizeof(struct lov_mds_md);
 103
 104         MOD_INC_USE_COUNT;
 105         RETURN(0);
 106 }
 107
 108 int client_obd_cleanup(struct obd_device * obddev)
 109 {
 110         struct client_obd *mdc = &obddev->u.cli;
 111
 112         ptlrpc_cleanup_client(&mdc->cl_import);
 113         ptlrpc_put_connection(mdc->cl_import.imp_connection);
 114
 115         MOD_DEC_USE_COUNT;
 116         return 0;
 117 }
 118
 119 int client_obd_connect(struct lustre_handle *conn, struct obd_device *obd,
 120                        char *cluuid)
 121 {
 122         struct client_obd *cli = &obd->u.cli;
 123         struct ptlrpc_request *request;
 124         int rc, size[] = {sizeof(cli->cl_target_uuid),
 125                           sizeof(obd->obd_uuid) };
 126         char *tmp[] = {cli->cl_target_uuid, obd->obd_uuid};
 127         int rq_opc = (obd->obd_type->typ_ops->o_brw) ? OST_CONNECT :MDS_CONNECT;
 128
 129         ENTRY;
 130         down(&cli->cl_sem);
 131         MOD_INC_USE_COUNT;
 132         rc = class_connect(conn, obd, cluuid);
 133         if (rc) {
 134                 MOD_DEC_USE_COUNT;
 135                 GOTO(out_sem, rc);
 136         }
 137         cli->cl_conn_count++;
 138         if (cli->cl_conn_count > 1)
 139                 GOTO(out_sem, rc);
 140
 141         obd->obd_namespace = ldlm_namespace_new(obd->obd_name,
 142                                                 LDLM_NAMESPACE_CLIENT);
 143         if (obd->obd_namespace == NULL)
 144                 GOTO(out_disco, rc = -ENOMEM);
 145
 146         request = ptlrpc_prep_req(&cli->cl_import, rq_opc, 2, size, tmp);
 147         if (!request)
 148                 GOTO(out_ldlm, rc = -ENOMEM);
 149
 150         request->rq_level = LUSTRE_CONN_NEW;
 151         request->rq_replen = lustre_msg_size(0, NULL);
 152         //   This handle may be important if a callback needs
 153         //   to find the mdc/osc
 154         request->rq_reqmsg->addr = conn->addr;
 155         request->rq_reqmsg->cookie = conn->cookie;
 156         class_conn2export(conn)->exp_connection = request->rq_connection;
 157
 158         rc = ptlrpc_queue_wait(request);
 159         rc = ptlrpc_check_status(request, rc);
 160         if (rc)
 161                 GOTO(out_req, rc);
 162
 163         request->rq_connection->c_level = LUSTRE_CONN_FULL;
 164         cli->cl_import.imp_handle = *(struct lustre_handle *)request->rq_repmsg;
 165
 166         EXIT;
 167 out_req:
 168         ptlrpc_free_req(request);
 169         if (rc) {
 170 out_ldlm:
 171                 ldlm_namespace_free(obd->obd_namespace);
 172                 obd->obd_namespace = NULL;
 173 out_disco:
 174                 class_disconnect(conn);
 175                 MOD_DEC_USE_COUNT;
 176         }
 177 out_sem:
 178         up(&cli->cl_sem);
 179         return rc;
 180 }
 181
 182 int client_obd_disconnect(struct lustre_handle *conn)
 183 {
 184         struct obd_device *obd = class_conn2obd(conn);
 185         struct client_obd *cli = &obd->u.cli;
 186         int rq_opc = (obd->obd_type->typ_ops->o_brw) ? OST_DISCONNECT : MDS_DISCONNECT;
 187         struct ptlrpc_request *request = NULL;
 188         int rc, err;
 189         ENTRY;
 190
 191         down(&cli->cl_sem);
 192         if (!cli->cl_conn_count) {
 193                 CERROR("disconnecting disconnected device (%s)\n",
 194                        obd->obd_name);
 195                 GOTO(out_sem, rc = -EINVAL);
 196         }
 197
 198         cli->cl_conn_count--;
 199         if (cli->cl_conn_count)
 200                 GOTO(out_disco, rc = 0);
 201
 202         ldlm_namespace_free(obd->obd_namespace);
 203         obd->obd_namespace = NULL;
 204         request = ptlrpc_prep_req(&cli->cl_import, rq_opc, 0, NULL, NULL);
 205         if (!request)
 206                 GOTO(out_disco, rc = -ENOMEM);
 207
 208         request->rq_replen = lustre_msg_size(0, NULL);
 209
 210         rc = ptlrpc_queue_wait(request);
 211         if (rc)
 212                 GOTO(out_req, rc);
 213
 214         EXIT;
 215  out_req:
 216         if (request)
 217                 ptlrpc_free_req(request);
 218  out_disco:
 219         err = class_disconnect(conn);
 220         if (!rc && err)
 221                 rc = err;
 222         MOD_DEC_USE_COUNT;
 223  out_sem:
 224         up(&cli->cl_sem);
 225         RETURN(rc);
 226 }
 227
 228 int target_handle_connect(struct ptlrpc_request *req)
 229 {
 230         struct obd_device *target;
 231         struct obd_export *export;
 232         struct obd_import *dlmimp;
 233         struct lustre_handle conn;
 234         char *tgtuuid, *cluuid;
 235         int rc, i;
 236         ENTRY;
 237
 238         tgtuuid = lustre_msg_buf(req->rq_reqmsg, 0);
 239         if (req->rq_reqmsg->buflens[0] > 37) {
 240                 CERROR("bad target UUID for connect\n");
 241                 GOTO(out, rc = -EINVAL);
 242         }
 243
 244         cluuid = lustre_msg_buf(req->rq_reqmsg, 1);
 245         if (req->rq_reqmsg->buflens[1] > 37) {
 246                 CERROR("bad client UUID for connect\n");
 247                 GOTO(out, rc = -EINVAL);
 248         }
 249
 250         i = class_uuid2dev(tgtuuid);
 251         if (i == -1) {
 252                 CERROR("UUID '%s' not found for connect\n", tgtuuid);
 253                 GOTO(out, rc = -ENODEV);
 254         }
 255
 256         target = &obd_dev[i];
 257         if (!target)
 258                 GOTO(out, rc = -ENODEV);
 259
 260         conn.addr = req->rq_reqmsg->addr;
 261         conn.cookie = req->rq_reqmsg->cookie;
 262
 263         rc = obd_connect(&conn, target, cluuid);
 264         if (rc)
 265                 GOTO(out, rc);
 266
 267         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 268         if (rc)
 269                 GOTO(out, rc);
 270         req->rq_repmsg->addr = conn.addr;
 271         req->rq_repmsg->cookie = conn.cookie;
 272
 273         export = class_conn2export(&conn);
 274         LASSERT(export);
 275
 276         req->rq_export = export;
 277         export->exp_connection = ptlrpc_get_connection(&req->rq_peer, cluuid);
 278         req->rq_connection = export->exp_connection;
 279
 280         spin_lock(&export->exp_connection->c_lock);
 281         list_add(&export->exp_conn_chain, &export->exp_connection->c_exports);
 282         spin_unlock(&export->exp_connection->c_lock);
 283
 284         recovd_conn_manage(export->exp_connection, ptlrpc_recovd,
 285                            target_revoke_connection);
 286         dlmimp = &export->exp_ldlm_data.led_import;
 287         dlmimp->imp_connection = req->rq_connection;
 288         dlmimp->imp_client = &export->exp_obd->obd_ldlm_client;
 289         dlmimp->imp_handle.addr = req->rq_reqmsg->addr;
 290         dlmimp->imp_handle.cookie = req->rq_reqmsg->cookie;
 291
 292 #warning Peter: is this the right place to upgrade the server connection level?
 293         req->rq_connection->c_level = LUSTRE_CONN_FULL;
 294 out:
 295         req->rq_status = rc;
 296         RETURN(rc);
 297 }
 298
 299 int target_handle_disconnect(struct ptlrpc_request *req)
 300 {
 301         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 302         int rc;
 303         ENTRY;
 304
 305         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 306         if (rc)
 307                 RETURN(rc);
 308
 309         req->rq_status = obd_disconnect(conn);
 310         RETURN(0);
 311 }
 312
 313 static int target_revoke_client_resources(struct ptlrpc_connection *conn)
 314 {
 315         struct list_head *tmp, *pos;
 316
 317         ENTRY;
 318
 319         /* Cancel outstanding locks. */
 320         list_for_each_safe(tmp, pos, &conn->c_exports) {
 321         }
 322
 323         RETURN(0);
 324 }
 325
 326 static int target_fence_failed_connection(struct ptlrpc_connection *conn)
 327 {
 328         ENTRY;
 329
 330         conn->c_level = LUSTRE_CONN_RECOVD;
 331
 332         RETURN(0);
 333 }
 334
 335 int target_revoke_connection(struct recovd_data *rd, int phase)
 336 {
 337         struct ptlrpc_connection *conn = class_rd2conn(rd);
 338
 339         LASSERT(conn);
 340         ENTRY;
 341
 342         switch (phase) {
 343             case PTLRPC_RECOVD_PHASE_PREPARE:
 344                 RETURN(target_fence_failed_connection(conn));
 345             case PTLRPC_RECOVD_PHASE_RECOVER:
 346                 RETURN(target_revoke_client_resources(conn));
 347             case PTLRPC_RECOVD_PHASE_FAILURE:
 348                 LBUG();
 349                 RETURN(0);
 350         }
 351
 352         LBUG();
 353         RETURN(-ENOSYS);
 354 }