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         obd_uuid_t server_uuid;
  50         ENTRY;
  51
  52         if (obddev->obd_type->typ_ops->o_brw) {
  53                 rq_portal = OST_REQUEST_PORTAL;
  54                 rp_portal = OSC_REPLY_PORTAL;
  55                 name = "osc";
  56         } else {
  57                 rq_portal = MDS_REQUEST_PORTAL;
  58                 rp_portal = MDC_REPLY_PORTAL;
  59                 name = "mdc";
  60         }
  61
  62         if (data->ioc_inllen1 < 1) {
  63                 CERROR("requires a TARGET UUID\n");
  64                 RETURN(-EINVAL);
  65         }
  66
  67         if (data->ioc_inllen1 > 37) {
  68                 CERROR("client UUID must be less than 38 characters\n");
  69                 RETURN(-EINVAL);
  70         }
  71
  72         if (data->ioc_inllen2 < 1) {
  73                 CERROR("setup requires a SERVER UUID\n");
  74                 RETURN(-EINVAL);
  75         }
  76
  77         if (data->ioc_inllen2 > 37) {
  78                 CERROR("target UUID must be less than 38 characters\n");
  79                 RETURN(-EINVAL);
  80         }
  81
  82         sema_init(&cli->cl_sem, 1);
  83         cli->cl_conn_count = 0;
  84         memcpy(cli->cl_target_uuid, data->ioc_inlbuf1, data->ioc_inllen1);
  85         memcpy(server_uuid, data->ioc_inlbuf2, MIN(data->ioc_inllen2,
  86                                                    sizeof(server_uuid)));
  87
  88         cli->cl_import.imp_connection = ptlrpc_uuid_to_connection(server_uuid);
  89         if (!cli->cl_import.imp_connection)
  90                 RETURN(-ENOENT);
  91
  92         ptlrpc_init_client(rq_portal, rp_portal, name,
  93                            &obddev->obd_ldlm_client);
  94         cli->cl_import.imp_client = &obddev->obd_ldlm_client;
  95         cli->cl_import.imp_obd = obddev;
  96
  97         cli->cl_max_mds_easize = sizeof(struct lov_mds_md);
  98         cli->cl_max_ost_easize = sizeof(struct lov_stripe_md);
  99
 100         MOD_INC_USE_COUNT;
 101         RETURN(0);
 102 }
 103
 104 int client_obd_cleanup(struct obd_device * obddev)
 105 {
 106         struct client_obd *obd = &obddev->u.cli;
 107
 108         ptlrpc_cleanup_client(&obd->cl_import);
 109         ptlrpc_put_connection(obd->cl_import.imp_connection);
 110
 111         MOD_DEC_USE_COUNT;
 112         return 0;
 113 }
 114
 115 int client_obd_connect(struct lustre_handle *conn, struct obd_device *obd,
 116                        obd_uuid_t cluuid, struct recovd_obd *recovd,
 117                        ptlrpc_recovery_cb_t recover)
 118 {
 119         struct client_obd *cli = &obd->u.cli;
 120         struct ptlrpc_request *request;
 121         int rc, size[] = {sizeof(cli->cl_target_uuid),
 122                           sizeof(obd->obd_uuid) };
 123         char *tmp[] = {cli->cl_target_uuid, obd->obd_uuid};
 124         int rq_opc = (obd->obd_type->typ_ops->o_brw) ? OST_CONNECT :MDS_CONNECT;
 125         struct ptlrpc_connection *c;
 126
 127         ENTRY;
 128         down(&cli->cl_sem);
 129         MOD_INC_USE_COUNT;
 130         rc = class_connect(conn, obd, cluuid);
 131         if (rc) {
 132                 MOD_DEC_USE_COUNT;
 133                 GOTO(out_sem, rc);
 134         }
 135         cli->cl_conn_count++;
 136         if (cli->cl_conn_count > 1)
 137                 GOTO(out_sem, rc);
 138
 139         obd->obd_namespace = ldlm_namespace_new(obd->obd_name,
 140                                                 LDLM_NAMESPACE_CLIENT);
 141         if (obd->obd_namespace == NULL)
 142                 GOTO(out_disco, rc = -ENOMEM);
 143
 144         request = ptlrpc_prep_req(&cli->cl_import, rq_opc, 2, size, tmp);
 145         if (!request)
 146                 GOTO(out_ldlm, rc = -ENOMEM);
 147
 148         request->rq_level = LUSTRE_CONN_NEW;
 149         request->rq_replen = lustre_msg_size(0, NULL);
 150         request->rq_reqmsg->addr = conn->addr;
 151         request->rq_reqmsg->cookie = conn->cookie;
 152         c = class_conn2export(conn)->exp_connection =
 153                 ptlrpc_connection_addref(request->rq_connection);
 154         recovd_conn_manage(c, recovd, recover);
 155
 156         rc = ptlrpc_queue_wait(request);
 157         rc = ptlrpc_check_status(request, rc);
 158         if (rc)
 159                 GOTO(out_req, rc);
 160
 161         if (rq_opc == MDS_CONNECT)
 162                 cli->cl_import.imp_flags |= IMP_REPLAYABLE;
 163         list_add(&cli->cl_import.imp_chain, &c->c_imports);
 164         c->c_level = LUSTRE_CONN_FULL;
 165         cli->cl_import.imp_handle.addr = request->rq_repmsg->addr;
 166         cli->cl_import.imp_handle.cookie = request->rq_repmsg->cookie;
 167
 168         EXIT;
 169 out_req:
 170         ptlrpc_req_finished(request);
 171         if (rc) {
 172 out_ldlm:
 173                 ldlm_namespace_free(obd->obd_namespace);
 174                 obd->obd_namespace = NULL;
 175 out_disco:
 176                 class_disconnect(conn);
 177                 MOD_DEC_USE_COUNT;
 178         }
 179 out_sem:
 180         up(&cli->cl_sem);
 181         return rc;
 182 }
 183
 184 int client_obd_disconnect(struct lustre_handle *conn)
 185 {
 186         struct obd_device *obd = class_conn2obd(conn);
 187         struct client_obd *cli = &obd->u.cli;
 188         int rq_opc;
 189         struct ptlrpc_request *request = NULL;
 190         int rc, err;
 191         ENTRY;
 192
 193         if (!obd) {
 194                 CERROR("invalid connection for disconnect: addr "LPX64
 195                        ", cookie "LPX64"\n", conn ? conn->addr : -1UL,
 196                        conn ? conn->cookie : -1UL);
 197                 RETURN(-EINVAL);
 198         }
 199
 200         rq_opc = obd->obd_type->typ_ops->o_brw ? OST_DISCONNECT:MDS_DISCONNECT;
 201         down(&cli->cl_sem);
 202         if (!cli->cl_conn_count) {
 203                 CERROR("disconnecting disconnected device (%s)\n",
 204                        obd->obd_name);
 205                 GOTO(out_sem, rc = -EINVAL);
 206         }
 207
 208         cli->cl_conn_count--;
 209         if (cli->cl_conn_count)
 210                 GOTO(out_disco, rc = 0);
 211
 212         ldlm_namespace_free(obd->obd_namespace);
 213         obd->obd_namespace = NULL;
 214         request = ptlrpc_prep_req(&cli->cl_import, rq_opc, 0, NULL, NULL);
 215         if (!request)
 216                 GOTO(out_disco, rc = -ENOMEM);
 217
 218         request->rq_replen = lustre_msg_size(0, NULL);
 219
 220         rc = ptlrpc_queue_wait(request);
 221         if (rc)
 222                 GOTO(out_req, rc);
 223
 224         EXIT;
 225  out_req:
 226         if (request)
 227                 ptlrpc_req_finished(request);
 228  out_disco:
 229         err = class_disconnect(conn);
 230         if (!rc && err)
 231                 rc = err;
 232         list_del_init(&cli->cl_import.imp_chain);
 233         MOD_DEC_USE_COUNT;
 234  out_sem:
 235         up(&cli->cl_sem);
 236         RETURN(rc);
 237 }