lustre/lib/client.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  *   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  * Client-common OBD method implementations and utility functions.
  25  */
  26
  27 #define EXPORT_SYMTAB
  28 #define DEBUG_SUBSYSTEM S_OST /* XXX WRONG */
  29
  30 #include <linux/module.h>
  31 #include <linux/obd_ost.h>
  32 #include <linux/lustre_net.h>
  33 #include <linux/lustre_dlm.h>
  34
  35 struct client_obd *client_conn2cli(struct lustre_handle *conn)
  36 {
  37         struct obd_export *export = class_conn2export(conn);
  38         if (!export)
  39                 LBUG();
  40         return &export->exp_obd->u.cli;
  41 }
  42
  43 int client_obd_setup(struct obd_device *obddev, obd_count len, void *buf)
  44 {
  45         struct obd_ioctl_data* data = buf;
  46         int rq_portal, rp_portal;
  47         char *name;
  48         struct client_obd *cli = &obddev->u.cli;
  49         struct obd_import *imp = &cli->cl_import;
  50         obd_uuid_t server_uuid;
  51         ENTRY;
  52
  53         if (obddev->obd_type->typ_ops->o_brw) {
  54                 rq_portal = OST_REQUEST_PORTAL;
  55                 rp_portal = OSC_REPLY_PORTAL;
  56                 name = "osc";
  57         } else {
  58                 rq_portal = MDS_REQUEST_PORTAL;
  59                 rp_portal = MDC_REPLY_PORTAL;
  60                 name = "mdc";
  61         }
  62
  63         if (data->ioc_inllen1 < 1) {
  64                 CERROR("requires a TARGET UUID\n");
  65                 RETURN(-EINVAL);
  66         }
  67
  68         if (data->ioc_inllen1 > 37) {
  69                 CERROR("client UUID must be less than 38 characters\n");
  70                 RETURN(-EINVAL);
  71         }
  72
  73         if (data->ioc_inllen2 < 1) {
  74                 CERROR("setup requires a SERVER UUID\n");
  75                 RETURN(-EINVAL);
  76         }
  77
  78         if (data->ioc_inllen2 > 37) {
  79                 CERROR("target UUID must be less than 38 characters\n");
  80                 RETURN(-EINVAL);
  81         }
  82
  83         sema_init(&cli->cl_sem, 1);
  84         cli->cl_conn_count = 0;
  85         memcpy(cli->cl_target_uuid, data->ioc_inlbuf1, data->ioc_inllen1);
  86         memcpy(server_uuid, data->ioc_inlbuf2, MIN(data->ioc_inllen2,
  87                                                    sizeof(server_uuid)));
  88
  89         imp->imp_connection = ptlrpc_uuid_to_connection(server_uuid);
  90         if (!imp->imp_connection)
  91                 RETURN(-ENOENT);
  92
  93         INIT_LIST_HEAD(&imp->imp_replay_list);
  94         INIT_LIST_HEAD(&imp->imp_sending_list);
  95         INIT_LIST_HEAD(&imp->imp_delayed_list);
  96         spin_lock_init(&imp->imp_lock);
  97
  98         ptlrpc_init_client(rq_portal, rp_portal, name,
  99                            &obddev->obd_ldlm_client);
 100         imp->imp_client = &obddev->obd_ldlm_client;
 101         imp->imp_obd = obddev;
 102
 103         cli->cl_max_mds_easize = sizeof(struct lov_mds_md);
 104
 105         MOD_INC_USE_COUNT;
 106         RETURN(0);
 107 }
 108
 109 int client_obd_cleanup(struct obd_device * obddev)
 110 {
 111         struct client_obd *obd = &obddev->u.cli;
 112
 113         ptlrpc_cleanup_client(&obd->cl_import);
 114         ptlrpc_put_connection(obd->cl_import.imp_connection);
 115
 116         MOD_DEC_USE_COUNT;
 117         return 0;
 118 }
 119
 120 int client_obd_connect(struct lustre_handle *conn, struct obd_device *obd,
 121                        obd_uuid_t cluuid, struct recovd_obd *recovd,
 122                        ptlrpc_recovery_cb_t recover)
 123 {
 124         struct client_obd *cli = &obd->u.cli;
 125         struct ptlrpc_request *request;
 126         int rc, size[] = {sizeof(cli->cl_target_uuid),
 127                           sizeof(obd->obd_uuid) };
 128         char *tmp[] = {cli->cl_target_uuid, obd->obd_uuid};
 129         int rq_opc = (obd->obd_type->typ_ops->o_brw) ? OST_CONNECT :MDS_CONNECT;
 130         struct ptlrpc_connection *c;
 131         struct obd_import *imp = &cli->cl_import;
 132
 133         ENTRY;
 134         down(&cli->cl_sem);
 135         MOD_INC_USE_COUNT;
 136         rc = class_connect(conn, obd, cluuid);
 137         if (rc) {
 138                 MOD_DEC_USE_COUNT;
 139                 GOTO(out_sem, rc);
 140         }
 141         cli->cl_conn_count++;
 142         if (cli->cl_conn_count > 1)
 143                 GOTO(out_sem, rc);
 144
 145         if (obd->obd_namespace != NULL)
 146                 CERROR("already have namespace!\n");
 147         obd->obd_namespace = ldlm_namespace_new(obd->obd_name,
 148                                                 LDLM_NAMESPACE_CLIENT);
 149         if (obd->obd_namespace == NULL)
 150                 GOTO(out_disco, rc = -ENOMEM);
 151
 152         INIT_LIST_HEAD(&imp->imp_chain);
 153         imp->imp_last_xid = 0;
 154         imp->imp_max_transno = 0;
 155         imp->imp_peer_last_xid = 0;
 156         imp->imp_peer_committed_transno = 0;
 157
 158         request = ptlrpc_prep_req(&cli->cl_import, rq_opc, 2, size, tmp);
 159         if (!request)
 160                 GOTO(out_ldlm, rc = -ENOMEM);
 161
 162         request->rq_level = LUSTRE_CONN_NEW;
 163         request->rq_replen = lustre_msg_size(0, NULL);
 164         request->rq_reqmsg->addr = conn->addr;
 165         request->rq_reqmsg->cookie = conn->cookie;
 166         c = class_conn2export(conn)->exp_connection =
 167                 ptlrpc_connection_addref(request->rq_connection);
 168         list_add(&imp->imp_chain, &c->c_imports);
 169         recovd_conn_manage(c, recovd, recover);
 170
 171         imp->imp_level = LUSTRE_CONN_CON;
 172         rc = ptlrpc_queue_wait(request);
 173         if (rc)
 174                 GOTO(out_req, rc);
 175
 176         if (rq_opc == MDS_CONNECT)
 177                 imp->imp_flags |= IMP_REPLAYABLE;
 178         imp->imp_level = LUSTRE_CONN_FULL;
 179         imp->imp_handle.addr = request->rq_repmsg->addr;
 180         imp->imp_handle.cookie = request->rq_repmsg->cookie;
 181
 182         EXIT;
 183 out_req:
 184         ptlrpc_req_finished(request);
 185         if (rc) {
 186 out_ldlm:
 187                 ldlm_namespace_free(obd->obd_namespace);
 188                 obd->obd_namespace = NULL;
 189                 if (rq_opc == MDS_CONNECT) {
 190                         /* Don't class_disconnect OSCs, because the LOV
 191                          * cares about them even if they can't connect to the
 192                          * OST.
 193                          *
 194                          * This is leak-bait, but without either a way to
 195                          * operate on the osc without an export or separate
 196                          * methods for connect-to-osc and connect-osc-to-ost
 197                          * it's not clear what else to do.
 198                          */
 199 out_disco:
 200                         cli->cl_conn_count--;
 201                         class_disconnect(conn);
 202                         MOD_DEC_USE_COUNT;
 203                 }
 204         }
 205 out_sem:
 206         up(&cli->cl_sem);
 207         return rc;
 208 }
 209
 210 int client_obd_disconnect(struct lustre_handle *conn)
 211 {
 212         struct obd_device *obd = class_conn2obd(conn);
 213         struct client_obd *cli = &obd->u.cli;
 214         int rq_opc;
 215         struct ptlrpc_request *request = NULL;
 216         int rc, err;
 217         ENTRY;
 218
 219         if (!obd) {
 220                 CERROR("invalid connection for disconnect: addr "LPX64
 221                        ", cookie "LPX64"\n", conn ? conn->addr : -1UL,
 222                        conn ? conn->cookie : -1UL);
 223                 RETURN(-EINVAL);
 224         }
 225
 226         rq_opc = obd->obd_type->typ_ops->o_brw ? OST_DISCONNECT:MDS_DISCONNECT;
 227         down(&cli->cl_sem);
 228         if (!cli->cl_conn_count) {
 229                 CERROR("disconnecting disconnected device (%s)\n",
 230                        obd->obd_name);
 231                 GOTO(out_sem, rc = -EINVAL);
 232         }
 233
 234         cli->cl_conn_count--;
 235         if (cli->cl_conn_count)
 236                 GOTO(out_disco, rc = 0);
 237
 238         ldlm_namespace_free(obd->obd_namespace);
 239         obd->obd_namespace = NULL;
 240         request = ptlrpc_prep_req(&cli->cl_import, rq_opc, 0, NULL,
 241                                   NULL);
 242         if (!request)
 243                 GOTO(out_disco, rc = -ENOMEM);
 244
 245         request->rq_replen = lustre_msg_size(0, NULL);
 246
 247         /* Process disconnects even if we're waiting for recovery. */
 248         request->rq_level = LUSTRE_CONN_RECOVD;
 249
 250         rc = ptlrpc_queue_wait(request);
 251         if (rc)
 252                 GOTO(out_req, rc);
 253
 254         EXIT;
 255  out_req:
 256         if (request)
 257                 ptlrpc_req_finished(request);
 258  out_disco:
 259         err = class_disconnect(conn);
 260         if (!rc && err)
 261                 rc = err;
 262         list_del_init(&cli->cl_import.imp_chain);
 263         MOD_DEC_USE_COUNT;
 264  out_sem:
 265         up(&cli->cl_sem);
 266         RETURN(rc);
 267 }