lustre/ptlrpc/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 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #define EXPORT_SYMTAB
  24
  25 #include <linux/config.h>
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28
  29 #define DEBUG_SUBSYSTEM S_RPC
  30
  31 #include <linux/obd_support.h>
  32 #include <linux/obd_class.h>
  33 #include <linux/lustre_net.h>
  34
  35 int ptlrpc_enqueue(struct ptlrpc_client *peer, struct ptlrpc_request *req)
  36 {
  37         struct ptlrpc_request *srv_req;
  38
  39         if (!peer->cli_obd) {
  40                 EXIT;
  41                 return -1;
  42         }
  43
  44         OBD_ALLOC(srv_req, sizeof(*srv_req));
  45         if (!srv_req) {
  46                 EXIT;
  47                 return -ENOMEM;
  48         }
  49
  50         CDEBUG(0, "peer obd minor %d, incoming req %p, srv_req %p\n",
  51                peer->cli_obd->obd_minor, req, srv_req);
  52
  53         memset(srv_req, 0, sizeof(*req));
  54
  55         /* move the request buffer */
  56         srv_req->rq_reqbuf = req->rq_reqbuf;
  57         srv_req->rq_reqlen = req->rq_reqlen;
  58         srv_req->rq_obd = peer->cli_obd;
  59
  60         /* remember where it came from */
  61         srv_req->rq_reply_handle = req;
  62
  63         spin_lock(&peer->cli_lock);
  64         list_add(&srv_req->rq_list, &peer->cli_obd->obd_req_list);
  65         spin_unlock(&peer->cli_lock);
  66         wake_up(&peer->cli_obd->obd_req_waitq);
  67         return 0;
  68 }
  69
  70 int ptlrpc_connect_client(int dev, char *uuid, int req_portal, int rep_portal,
  71                           req_pack_t req_pack, rep_unpack_t rep_unpack,
  72                           struct ptlrpc_client *cl)
  73 {
  74         int err;
  75
  76         memset(cl, 0, sizeof(*cl));
  77         spin_lock_init(&cl->cli_lock);
  78         cl->cli_xid = 1;
  79         cl->cli_obd = NULL;
  80         cl->cli_request_portal = req_portal;
  81         cl->cli_reply_portal = rep_portal;
  82         cl->cli_rep_unpack = rep_unpack;
  83         cl->cli_req_pack = req_pack;
  84
  85         /* non networked client */
  86         if (dev >= 0 && dev < MAX_OBD_DEVICES) {
  87                 struct obd_device *obd = &obd_dev[dev];
  88
  89                 if ((!obd->obd_flags & OBD_ATTACHED) ||
  90                     (!obd->obd_flags & OBD_SET_UP)) {
  91                         CERROR("target device %d not att or setup\n", dev);
  92                         return -EINVAL;
  93                 }
  94                 if (strcmp(obd->obd_type->typ_name, "ost") &&
  95                     strcmp(obd->obd_type->typ_name, "mds")) {
  96                         return -EINVAL;
  97                 }
  98
  99                 cl->cli_obd = &obd_dev[dev];
 100                 return 0;
 101         }
 102
 103         /* networked */
 104         err = kportal_uuid_to_peer(uuid, &cl->cli_server);
 105         if (err != 0)
 106                 CERROR("cannot find peer %s!\n", uuid);
 107
 108         return err;
 109 }
 110
 111 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk(struct lustre_peer *peer)
 112 {
 113         struct ptlrpc_bulk_desc *bulk;
 114
 115         OBD_ALLOC(bulk, sizeof(*bulk));
 116         if (bulk != NULL) {
 117                 memset(bulk, 0, sizeof(*bulk));
 118                 memcpy(&bulk->b_peer, peer, sizeof(*peer));
 119                 init_waitqueue_head(&bulk->b_waitq);
 120         }
 121
 122         return bulk;
 123 }
 124
 125 struct ptlrpc_request *ptlrpc_prep_req(struct ptlrpc_client *cl,
 126                                        int opcode, int namelen, char *name,
 127                                        int tgtlen, char *tgt)
 128 {
 129         struct ptlrpc_request *request;
 130         int rc;
 131         ENTRY;
 132
 133         OBD_ALLOC(request, sizeof(*request));
 134         if (!request) {
 135                 CERROR("request allocation out of memory\n");
 136                 return NULL;
 137         }
 138
 139         memset(request, 0, sizeof(*request));
 140         //spin_lock_init(&request->rq_lock);
 141
 142         spin_lock(&cl->cli_lock);
 143         request->rq_xid = cl->cli_xid++;
 144         spin_unlock(&cl->cli_lock);
 145
 146         rc = cl->cli_req_pack(name, namelen, tgt, tgtlen,
 147                           &request->rq_reqhdr, &request->rq_req,
 148                           &request->rq_reqlen, &request->rq_reqbuf);
 149         if (rc) {
 150                 CERROR("cannot pack request %d\n", rc);
 151                 return NULL;
 152         }
 153         request->rq_reqhdr->opc = opcode;
 154         request->rq_reqhdr->xid = request->rq_xid;
 155
 156         EXIT;
 157         return request;
 158 }
 159
 160 void ptlrpc_free_req(struct ptlrpc_request *request)
 161 {
 162         if (request == NULL)
 163                 return;
 164
 165         if (request->rq_repbuf != NULL)
 166                 OBD_FREE(request->rq_repbuf, request->rq_replen);
 167         OBD_FREE(request, sizeof(*request));
 168 }
 169
 170 static int ptlrpc_check_reply(struct ptlrpc_request *req)
 171 {
 172         int rc = 0;
 173
 174         //spin_lock(&req->rq_lock);
 175         if (req->rq_repbuf != NULL) {
 176                 req->rq_flags = PTL_RPC_REPLY;
 177                 EXIT;
 178                 rc = 1;
 179                 goto out;
 180         }
 181
 182         if (sigismember(&(current->pending.signal), SIGKILL) ||
 183             sigismember(&(current->pending.signal), SIGTERM) ||
 184             sigismember(&(current->pending.signal), SIGSTOP) ||
 185             sigismember(&(current->pending.signal), SIGINT)) {
 186                 req->rq_flags = PTL_RPC_INTR;
 187                 EXIT;
 188                 rc = 1;
 189                 goto out;
 190         }
 191
 192  out:
 193         //spin_unlock(&req->rq_lock);
 194         return rc;
 195 }
 196
 197 int ptlrpc_check_status(struct ptlrpc_request *req, int err)
 198 {
 199         ENTRY;
 200
 201         if (err != 0) {
 202                 CERROR("err is %d\n", err);
 203                 EXIT;
 204                 return err;
 205         }
 206
 207         if (req == NULL) {
 208                 CERROR("req == NULL\n");
 209                 EXIT;
 210                 return -ENOMEM;
 211         }
 212
 213         if (req->rq_rephdr == NULL) {
 214                 CERROR("req->rq_rephdr == NULL\n");
 215                 EXIT;
 216                 return -ENOMEM;
 217         }
 218
 219         if (req->rq_rephdr->status != 0) {
 220                 CERROR("req->rq_rephdr->status is %d\n",
 221                        req->rq_rephdr->status);
 222                 EXIT;
 223                 /* XXX: translate this error from net to host */
 224                 return req->rq_rephdr->status;
 225         }
 226
 227         EXIT;
 228         return 0;
 229 }
 230
 231 /* Abort this request and cleanup any resources associated with it. */
 232 int ptlrpc_abort(struct ptlrpc_request *request)
 233 {
 234         /* First remove the ME for the reply; in theory, this means
 235          * that we can tear down the buffer safely. */
 236         //spin_lock(&request->rq_lock);
 237         PtlMEUnlink(request->rq_reply_me_h);
 238         OBD_FREE(request->rq_repbuf, request->rq_replen);
 239         request->rq_repbuf = NULL;
 240         request->rq_replen = 0;
 241         //spin_unlock(&request->rq_lock);
 242
 243         return 0;
 244 }
 245
 246
 247 int ptlrpc_queue_wait(struct ptlrpc_client *cl, struct ptlrpc_request *req)
 248
 249 {
 250         int rc = 0;
 251         ENTRY;
 252
 253         init_waitqueue_head(&req->rq_wait_for_rep);
 254
 255         if (cl->cli_obd) {
 256                 /* Local delivery */
 257                 ENTRY;
 258                 rc = ptlrpc_enqueue(cl, req);
 259         } else {
 260                 /* Remote delivery via portals. */
 261                 req->rq_req_portal = cl->cli_request_portal;
 262                 req->rq_reply_portal = cl->cli_reply_portal;
 263                 rc = ptl_send_rpc(req, &cl->cli_server);
 264         }
 265         if (rc) {
 266                 CERROR("error %d, opcode %d\n", rc, req->rq_reqhdr->opc);
 267                 return -rc;
 268         }
 269
 270         CDEBUG(D_OTHER, "-- sleeping\n");
 271         wait_event_interruptible(req->rq_wait_for_rep, ptlrpc_check_reply(req));
 272         CDEBUG(D_OTHER, "-- done\n");
 273         //spin_lock(&req->rq_lock);
 274         if (req->rq_flags == PTL_RPC_INTR) {
 275                 /* Clean up the dangling reply buffers */
 276                 ptlrpc_abort(req);
 277                 EXIT;
 278                 rc = -EINTR;
 279                 goto out;
 280         }
 281
 282         if (req->rq_flags != PTL_RPC_REPLY) {
 283                 CERROR("Unknown reason for wakeup\n");
 284                 /* XXX Phil - I end up here when I kill obdctl */
 285                 ptlrpc_abort(req);
 286                 //BUG();
 287                 EXIT;
 288                 rc = -EINTR;
 289                 goto out;
 290         }
 291
 292         rc = cl->cli_rep_unpack(req->rq_repbuf, req->rq_replen,
 293                                 &req->rq_rephdr, &req->rq_rep);
 294         if (rc) {
 295                 CERROR("unpack_rep failed: %d\n", rc);
 296                 goto out;
 297         }
 298         CDEBUG(D_NET, "got rep %d\n", req->rq_rephdr->xid);
 299
 300         if ( req->rq_rephdr->status == 0 )
 301                 CDEBUG(D_NET, "--> buf %p len %d status %d\n", req->rq_repbuf,
 302                        req->rq_replen, req->rq_rephdr->status);
 303
 304         EXIT;
 305  out:
 306         //spin_unlock(&req->rq_lock);
 307         return rc;
 308 }