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 struct obd_device *client_tgtuuid2obd(char *tgtuuid)
  44 {
  45         int i;
  46
  47         for (i=0; i < MAX_OBD_DEVICES; i++) {
  48                 struct obd_device *obd = &obd_dev[i];
  49                 if ((strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) == 0) ||
  50                     (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0)) {
  51                         struct client_obd *cli = &obd->u.cli;
  52                         if (strncmp(tgtuuid, cli->cl_target_uuid,
  53                                     sizeof(cli->cl_target_uuid)) == 0)
  54                                 return obd;
  55                 }
  56         }
  57
  58         return NULL;
  59 }
  60
  61 int client_obd_setup(struct obd_device *obddev, obd_count len, void *buf)
  62 {
  63         struct obd_ioctl_data* data = buf;
  64         int rq_portal, rp_portal;
  65         char *name;
  66         struct client_obd *cli = &obddev->u.cli;
  67         struct obd_import *imp = &cli->cl_import;
  68         obd_uuid_t server_uuid;
  69         ENTRY;
  70
  71         if (obddev->obd_type->typ_ops->o_brw) {
  72                 rq_portal = OST_REQUEST_PORTAL;
  73                 rp_portal = OSC_REPLY_PORTAL;
  74                 name = "osc";
  75         } else {
  76                 rq_portal = MDS_REQUEST_PORTAL;
  77                 rp_portal = MDC_REPLY_PORTAL;
  78                 name = "mdc";
  79         }
  80
  81         if (data->ioc_inllen1 < 1) {
  82                 CERROR("requires a TARGET UUID\n");
  83                 RETURN(-EINVAL);
  84         }
  85
  86         if (data->ioc_inllen1 > 37) {
  87                 CERROR("client UUID must be less than 38 characters\n");
  88                 RETURN(-EINVAL);
  89         }
  90
  91         if (data->ioc_inllen2 < 1) {
  92                 CERROR("setup requires a SERVER UUID\n");
  93                 RETURN(-EINVAL);
  94         }
  95
  96         if (data->ioc_inllen2 > 37) {
  97                 CERROR("target UUID must be less than 38 characters\n");
  98                 RETURN(-EINVAL);
  99         }
 100
 101         sema_init(&cli->cl_sem, 1);
 102         cli->cl_conn_count = 0;
 103         memcpy(cli->cl_target_uuid, data->ioc_inlbuf1, data->ioc_inllen1);
 104         memcpy(server_uuid, data->ioc_inlbuf2, MIN(data->ioc_inllen2,
 105                                                    sizeof(server_uuid)));
 106
 107         imp->imp_connection = ptlrpc_uuid_to_connection(server_uuid);
 108         if (!imp->imp_connection)
 109                 RETURN(-ENOENT);
 110
 111         INIT_LIST_HEAD(&imp->imp_replay_list);
 112         INIT_LIST_HEAD(&imp->imp_sending_list);
 113         INIT_LIST_HEAD(&imp->imp_delayed_list);
 114         spin_lock_init(&imp->imp_lock);
 115
 116         ptlrpc_init_client(rq_portal, rp_portal, name,
 117                            &obddev->obd_ldlm_client);
 118         imp->imp_client = &obddev->obd_ldlm_client;
 119         imp->imp_obd = obddev;
 120
 121         cli->cl_max_mds_easize = sizeof(struct lov_mds_md);
 122
 123         MOD_INC_USE_COUNT;
 124         RETURN(0);
 125 }
 126
 127 int client_obd_cleanup(struct obd_device * obddev)
 128 {
 129         struct client_obd *obd = &obddev->u.cli;
 130
 131         ptlrpc_cleanup_client(&obd->cl_import);
 132         ptlrpc_put_connection(obd->cl_import.imp_connection);
 133
 134         MOD_DEC_USE_COUNT;
 135         return 0;
 136 }
 137
 138 int client_obd_connect(struct lustre_handle *conn, struct obd_device *obd,
 139                        obd_uuid_t cluuid, struct recovd_obd *recovd,
 140                        ptlrpc_recovery_cb_t recover)
 141 {
 142         struct client_obd *cli = &obd->u.cli;
 143         struct ptlrpc_request *request;
 144         int rc, size[] = {sizeof(cli->cl_target_uuid),
 145                           sizeof(obd->obd_uuid) };
 146         char *tmp[] = {cli->cl_target_uuid, obd->obd_uuid};
 147         int rq_opc = (obd->obd_type->typ_ops->o_brw) ? OST_CONNECT :MDS_CONNECT;
 148         struct ptlrpc_connection *c;
 149         struct obd_import *imp = &cli->cl_import;
 150
 151         ENTRY;
 152         down(&cli->cl_sem);
 153         MOD_INC_USE_COUNT;
 154         rc = class_connect(conn, obd, cluuid);
 155         if (rc) {
 156                 MOD_DEC_USE_COUNT;
 157                 GOTO(out_sem, rc);
 158         }
 159         cli->cl_conn_count++;
 160         if (cli->cl_conn_count > 1)
 161                 GOTO(out_sem, rc);
 162
 163         if (obd->obd_namespace != NULL)
 164                 CERROR("already have namespace!\n");
 165         obd->obd_namespace = ldlm_namespace_new(obd->obd_name,
 166                                                 LDLM_NAMESPACE_CLIENT);
 167         if (obd->obd_namespace == NULL)
 168                 GOTO(out_disco, rc = -ENOMEM);
 169
 170         INIT_LIST_HEAD(&imp->imp_chain);
 171         imp->imp_last_xid = 0;
 172         imp->imp_max_transno = 0;
 173         imp->imp_peer_last_xid = 0;
 174         imp->imp_peer_committed_transno = 0;
 175
 176         request = ptlrpc_prep_req(&cli->cl_import, rq_opc, 2, size, tmp);
 177         if (!request)
 178                 GOTO(out_ldlm, rc = -ENOMEM);
 179
 180         request->rq_level = LUSTRE_CONN_NEW;
 181         request->rq_replen = lustre_msg_size(0, NULL);
 182         request->rq_reqmsg->addr = conn->addr;
 183         request->rq_reqmsg->cookie = conn->cookie;
 184         c = class_conn2export(conn)->exp_connection =
 185                 ptlrpc_connection_addref(request->rq_connection);
 186         list_add(&imp->imp_chain, &c->c_imports);
 187         recovd_conn_manage(c, recovd, recover);
 188
 189         imp->imp_level = LUSTRE_CONN_CON;
 190         rc = ptlrpc_queue_wait(request);
 191         if (rc)
 192                 GOTO(out_req, rc);
 193
 194         if (rq_opc == MDS_CONNECT)
 195                 imp->imp_flags |= IMP_REPLAYABLE;
 196         imp->imp_level = LUSTRE_CONN_FULL;
 197         imp->imp_handle.addr = request->rq_repmsg->addr;
 198         imp->imp_handle.cookie = request->rq_repmsg->cookie;
 199
 200         EXIT;
 201 out_req:
 202         ptlrpc_req_finished(request);
 203         if (rc) {
 204 out_ldlm:
 205                 ldlm_namespace_free(obd->obd_namespace);
 206                 obd->obd_namespace = NULL;
 207                 if (rq_opc == MDS_CONNECT) {
 208                         /* Don't class_disconnect OSCs, because the LOV
 209                          * cares about them even if they can't connect to the
 210                          * OST.
 211                          *
 212                          * This is leak-bait, but without either a way to
 213                          * operate on the osc without an export or separate
 214                          * methods for connect-to-osc and connect-osc-to-ost
 215                          * it's not clear what else to do.
 216                          */
 217 out_disco:
 218                         cli->cl_conn_count--;
 219                         class_disconnect(conn);
 220                         MOD_DEC_USE_COUNT;
 221                 }
 222         }
 223 out_sem:
 224         up(&cli->cl_sem);
 225         return rc;
 226 }
 227
 228 int client_obd_disconnect(struct lustre_handle *conn)
 229 {
 230         struct obd_device *obd = class_conn2obd(conn);
 231         struct client_obd *cli = &obd->u.cli;
 232         int rq_opc;
 233         struct ptlrpc_request *request = NULL;
 234         int rc, err;
 235         ENTRY;
 236
 237         if (!obd) {
 238                 CERROR("invalid connection for disconnect: addr "LPX64
 239                        ", cookie "LPX64"\n", conn ? conn->addr : -1UL,
 240                        conn ? conn->cookie : -1UL);
 241                 RETURN(-EINVAL);
 242         }
 243
 244         rq_opc = obd->obd_type->typ_ops->o_brw ? OST_DISCONNECT:MDS_DISCONNECT;
 245         down(&cli->cl_sem);
 246         if (!cli->cl_conn_count) {
 247                 CERROR("disconnecting disconnected device (%s)\n",
 248                        obd->obd_name);
 249                 GOTO(out_sem, rc = -EINVAL);
 250         }
 251
 252         cli->cl_conn_count--;
 253         if (cli->cl_conn_count)
 254                 GOTO(out_disco, rc = 0);
 255
 256         ldlm_namespace_free(obd->obd_namespace);
 257         obd->obd_namespace = NULL;
 258         request = ptlrpc_prep_req(&cli->cl_import, rq_opc, 0, NULL,
 259                                   NULL);
 260         if (!request)
 261                 GOTO(out_disco, rc = -ENOMEM);
 262
 263         request->rq_replen = lustre_msg_size(0, NULL);
 264
 265         /* Process disconnects even if we're waiting for recovery. */
 266         request->rq_level = LUSTRE_CONN_RECOVD;
 267
 268         rc = ptlrpc_queue_wait(request);
 269         if (rc)
 270                 GOTO(out_req, rc);
 271
 272         EXIT;
 273  out_req:
 274         if (request)
 275                 ptlrpc_req_finished(request);
 276  out_disco:
 277         err = class_disconnect(conn);
 278         if (!rc && err)
 279                 rc = err;
 280         list_del_init(&cli->cl_import.imp_chain);
 281         MOD_DEC_USE_COUNT;
 282  out_sem:
 283         up(&cli->cl_sem);
 284         RETURN(rc);
 285 }