lustre/lib/target.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  * Target-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 int target_handle_connect(struct ptlrpc_request *req)
  36 {
  37         struct obd_device *target;
  38         struct obd_export *export;
  39         struct obd_import *dlmimp;
  40         struct lustre_handle conn;
  41         char *tgtuuid, *cluuid;
  42         int rc, i;
  43         ENTRY;
  44
  45         tgtuuid = lustre_msg_buf(req->rq_reqmsg, 0);
  46         if (req->rq_reqmsg->buflens[0] > 37) {
  47                 CERROR("bad target UUID for connect\n");
  48                 GOTO(out, rc = -EINVAL);
  49         }
  50
  51         cluuid = lustre_msg_buf(req->rq_reqmsg, 1);
  52         if (req->rq_reqmsg->buflens[1] > 37) {
  53                 CERROR("bad client UUID for connect\n");
  54                 GOTO(out, rc = -EINVAL);
  55         }
  56
  57         i = class_uuid2dev(tgtuuid);
  58         if (i == -1) {
  59                 CERROR("UUID '%s' not found for connect\n", tgtuuid);
  60                 GOTO(out, rc = -ENODEV);
  61         }
  62
  63         target = &obd_dev[i];
  64         if (!target)
  65                 GOTO(out, rc = -ENODEV);
  66
  67         conn.addr = req->rq_reqmsg->addr;
  68         conn.cookie = req->rq_reqmsg->cookie;
  69
  70         rc = obd_connect(&conn, target, cluuid, ptlrpc_recovd,
  71                          target_revoke_connection);
  72         /* EALREADY indicates a reconnection, send the reply normally. */
  73         if (rc && rc != EALREADY)
  74                 GOTO(out, rc);
  75
  76         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
  77         if (rc)
  78                 GOTO(out, rc);
  79         req->rq_repmsg->addr = conn.addr;
  80         req->rq_repmsg->cookie = conn.cookie;
  81
  82         export = class_conn2export(&conn);
  83         LASSERT(export);
  84
  85         req->rq_export = export;
  86         export->exp_connection = ptlrpc_get_connection(&req->rq_peer, cluuid);
  87         if (req->rq_connection != NULL)
  88                 ptlrpc_put_connection(req->rq_connection);
  89         req->rq_connection = ptlrpc_connection_addref(export->exp_connection);
  90
  91         spin_lock(&export->exp_connection->c_lock);
  92         list_add(&export->exp_conn_chain, &export->exp_connection->c_exports);
  93         spin_unlock(&export->exp_connection->c_lock);
  94         recovd_conn_manage(export->exp_connection, ptlrpc_recovd,
  95                            target_revoke_connection);
  96
  97         dlmimp = &export->exp_ldlm_data.led_import;
  98         dlmimp->imp_connection = req->rq_connection;
  99         dlmimp->imp_client = &export->exp_obd->obd_ldlm_client;
 100         dlmimp->imp_handle.addr = req->rq_reqmsg->addr;
 101         dlmimp->imp_handle.cookie = req->rq_reqmsg->cookie;
 102         dlmimp->imp_obd = /* LDLM! */ NULL;
 103         spin_lock_init(&dlmimp->imp_lock);
 104
 105         req->rq_connection->c_level = LUSTRE_CONN_FULL;
 106 out:
 107         req->rq_status = rc;
 108         RETURN(rc);
 109 }
 110
 111 int target_handle_disconnect(struct ptlrpc_request *req)
 112 {
 113         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 114         int rc;
 115         ENTRY;
 116
 117         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 118         if (rc)
 119                 RETURN(rc);
 120
 121         req->rq_status = obd_disconnect(conn);
 122
 123         RETURN(0);
 124 }
 125
 126 static int target_disconnect_client(struct ptlrpc_connection *conn)
 127 {
 128         struct list_head *expiter, *n;
 129         struct lustre_handle hdl;
 130         struct obd_export *exp;
 131         int rc;
 132         ENTRY;
 133
 134         list_for_each_safe(expiter, n, &conn->c_exports) {
 135                 exp = list_entry(expiter, struct obd_export, exp_conn_chain);
 136
 137                 hdl.addr = (__u64)(unsigned long)exp;
 138                 hdl.cookie = exp->exp_cookie;
 139                 rc = obd_disconnect(&hdl);
 140                 if (rc)
 141                         CERROR("disconnecting export %p failed: %d\n", exp, rc);
 142         }
 143
 144         /* XXX spank the connection (it's frozen in _RECOVD for now!) */
 145         RETURN(0);
 146 }
 147
 148 static int target_fence_failed_connection(struct ptlrpc_connection *conn)
 149 {
 150         ENTRY;
 151
 152         conn->c_level = LUSTRE_CONN_RECOVD;
 153         conn->c_recovd_data.rd_phase = RD_PREPARED;
 154
 155         RETURN(0);
 156 }
 157
 158 int target_revoke_connection(struct recovd_data *rd, int phase)
 159 {
 160         struct ptlrpc_connection *conn = class_rd2conn(rd);
 161
 162         LASSERT(conn);
 163         ENTRY;
 164
 165         switch (phase) {
 166             case PTLRPC_RECOVD_PHASE_PREPARE:
 167                 RETURN(target_fence_failed_connection(conn));
 168             case PTLRPC_RECOVD_PHASE_RECOVER:
 169                 RETURN(target_disconnect_client(conn));
 170             case PTLRPC_RECOVD_PHASE_FAILURE:
 171                 LBUG();
 172                 RETURN(0);
 173         }
 174
 175         LBUG();
 176         RETURN(-ENOSYS);
 177 }