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         if (rc)
  73                 GOTO(out, rc);
  74
  75         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
  76         if (rc)
  77                 GOTO(out, rc);
  78         req->rq_repmsg->addr = conn.addr;
  79         req->rq_repmsg->cookie = conn.cookie;
  80
  81         export = class_conn2export(&conn);
  82         LASSERT(export);
  83
  84         req->rq_export = export;
  85         export->exp_connection = ptlrpc_get_connection(&req->rq_peer, cluuid);
  86         if (req->rq_connection != NULL)
  87                 ptlrpc_put_connection(req->rq_connection);
  88         req->rq_connection = ptlrpc_connection_addref(export->exp_connection);
  89
  90         spin_lock(&export->exp_connection->c_lock);
  91         list_add(&export->exp_conn_chain, &export->exp_connection->c_exports);
  92         spin_unlock(&export->exp_connection->c_lock);
  93
  94         dlmimp = &export->exp_ldlm_data.led_import;
  95         dlmimp->imp_connection = req->rq_connection;
  96         dlmimp->imp_client = &export->exp_obd->obd_ldlm_client;
  97         dlmimp->imp_handle.addr = req->rq_reqmsg->addr;
  98         dlmimp->imp_handle.cookie = req->rq_reqmsg->cookie;
  99         dlmimp->imp_obd = /* LDLM! */ NULL;
 100
 101 #warning Peter: is this the right place to upgrade the server connection level?
 102         req->rq_connection->c_level = LUSTRE_CONN_FULL;
 103 out:
 104         req->rq_status = rc;
 105         RETURN(rc);
 106 }
 107
 108 int target_handle_disconnect(struct ptlrpc_request *req)
 109 {
 110         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 111         int rc;
 112         ENTRY;
 113
 114         rc = lustre_pack_msg(0, NULL, NULL, &req->rq_replen, &req->rq_repmsg);
 115         if (rc)
 116                 RETURN(rc);
 117
 118         req->rq_status = obd_disconnect(conn);
 119
 120         RETURN(0);
 121 }
 122
 123 static int target_disconnect_client(struct ptlrpc_connection *conn)
 124 {
 125         struct list_head *expiter, *n;
 126         struct lustre_handle hdl;
 127         struct obd_export *exp;
 128         int rc;
 129         ENTRY;
 130
 131         list_for_each_safe(expiter, n, &conn->c_exports) {
 132                 exp = list_entry(expiter, struct obd_export, exp_conn_chain);
 133
 134                 hdl.addr = (__u64)(unsigned long)exp;
 135                 hdl.cookie = exp->exp_cookie;
 136                 rc = obd_disconnect(&hdl);
 137                 if (rc)
 138                         CERROR("disconnecting export %p failed: %d\n", exp, rc);
 139         }
 140         RETURN(0);
 141 }
 142
 143 static int target_fence_failed_connection(struct ptlrpc_connection *conn)
 144 {
 145         ENTRY;
 146
 147         conn->c_level = LUSTRE_CONN_RECOVD;
 148         conn->c_recovd_data.rd_phase = RD_PREPARED;
 149
 150         RETURN(0);
 151 }
 152
 153 int target_revoke_connection(struct recovd_data *rd, int phase)
 154 {
 155         struct ptlrpc_connection *conn = class_rd2conn(rd);
 156
 157         LASSERT(conn);
 158         ENTRY;
 159
 160         switch (phase) {
 161             case PTLRPC_RECOVD_PHASE_PREPARE:
 162                 RETURN(target_fence_failed_connection(conn));
 163             case PTLRPC_RECOVD_PHASE_RECOVER:
 164                 RETURN(target_disconnect_client(conn));
 165             case PTLRPC_RECOVD_PHASE_FAILURE:
 166                 LBUG();
 167                 RETURN(0);
 168         }
 169
 170         LBUG();
 171         RETURN(-ENOSYS);
 172 }