/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * Lustre Light Super operations * * This code is issued under the GNU General Public License. * See the file COPYING in this distribution * * Copryright (C) 1996 Peter J. Braam * Copryright (C) 1999 Stelias Computing Inc. * Copryright (C) 1999 Seagate Technology Inc. * Copryright (C) 2001 Mountain View Data, Inc. * Copryright (C) 2002 Cluster File Systems, Inc. * */ #include #include #include #define DEBUG_SUBSYSTEM S_LLITE #include #include int ll_reconnect(struct ptlrpc_connection *conn) { struct ptlrpc_request *request; struct list_head *tmp; int rc = -EINVAL; /* XXX c_lock semantics! */ conn->c_level = LUSTRE_CONN_CON; /* XXX this code MUST be shared with class_obd_connect! */ list_for_each(tmp, &conn->c_imports) { struct obd_import *imp = list_entry(tmp, struct obd_import, imp_chain); struct obd_device *obd = imp->imp_obd; struct client_obd *cli = &obd->u.cli; int rq_opc = (obd->obd_type->typ_ops->o_brw) ? OST_CONNECT : MDS_CONNECT; int size[] = { sizeof(cli->cl_target_uuid), sizeof(obd->obd_uuid) }; char *tmp[] = {cli->cl_target_uuid, obd->obd_uuid }; struct lustre_handle old_hdl; LASSERT(imp->imp_connection == conn); request = ptlrpc_prep_req(imp, rq_opc, 2, size, tmp); request->rq_level = LUSTRE_CONN_NEW; request->rq_replen = lustre_msg_size(0, NULL); /* XXX are (addr, cookie) right? */ request->rq_reqmsg->addr = imp->imp_handle.addr; request->rq_reqmsg->cookie = imp->imp_handle.cookie; rc = ptlrpc_queue_wait(request); rc = ptlrpc_check_status(request, rc); if (rc) { CERROR("cannot connect to %s@%s: rc = %d\n", cli->cl_target_uuid, conn->c_remote_uuid, rc); ptlrpc_free_req(request); GOTO(out_disc, rc = -ENOTCONN); } old_hdl = imp->imp_handle; imp->imp_handle.addr = request->rq_repmsg->addr; imp->imp_handle.cookie = request->rq_repmsg->cookie; CERROR("reconnected to %s@%s (%Lx/%Lx, was %Lx/%Lx)!\n", cli->cl_target_uuid, conn->c_remote_uuid, imp->imp_handle.addr, imp->imp_handle.cookie, old_hdl.addr, old_hdl.cookie); ptlrpc_free_req(request); } conn->c_level = LUSTRE_CONN_RECOVD; out_disc: return rc; } static int ll_recover_upcall(struct ptlrpc_connection *conn) { char *argv[3]; char *envp[3]; ENTRY; conn->c_level = LUSTRE_CONN_RECOVD; argv[0] = obd_recovery_upcall; argv[1] = conn->c_remote_uuid; argv[2] = NULL; envp[0] = "HOME=/"; envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; envp[2] = NULL; RETURN(call_usermodehelper(argv[0], argv, envp)); } static int ll_recover_reconnect(struct ptlrpc_connection *conn) { int rc = 0; struct list_head *tmp, *pos; struct ptlrpc_request *req; ENTRY; /* 1. reconnect */ rc = ll_reconnect(conn); if (rc) RETURN(rc); /* 2. walk the request list */ spin_lock(&conn->c_lock); list_for_each_safe(tmp, pos, &conn->c_sending_head) { req = list_entry(tmp, struct ptlrpc_request, rq_list); /* replay what needs to be replayed */ if (req->rq_flags & PTL_RPC_FL_REPLAY) { CDEBUG(D_INODE, "req %Ld needs replay [last rcvd %Ld]\n", req->rq_xid, conn->c_last_xid); rc = ptlrpc_replay_req(req); #if 0 #error We should not hold a spinlock over such a lengthy operation. #error If necessary, drop spinlock, do operation, re-get spinlock, restart loop. #error If we need to avoid re-processint items, then delete them from the list #error as they are replayed and re-add at the tail of this list, so the next #error item to process will always be at the head of the list. #endif if (rc) { CERROR("recovery replay error %d for req %Ld\n", rc, req->rq_xid); GOTO(out, rc); } } /* server has seen req, we have reply: skip */ if ((req->rq_flags & PTL_RPC_FL_REPLIED) && req->rq_xid <= conn->c_last_xid) { CDEBUG(D_INODE, "req %Ld was complete: skip [last rcvd %Ld]\n", req->rq_xid, conn->c_last_xid); continue; } /* server has lost req, we have reply: resend, ign reply */ if ((req->rq_flags & PTL_RPC_FL_REPLIED) && req->rq_xid > conn->c_last_xid) { CDEBUG(D_INODE, "lost req %Ld have rep: replay [last " "rcvd %Ld]\n", req->rq_xid, conn->c_last_xid); rc = ptlrpc_replay_req(req); if (rc) { CERROR("request resend error %d for req %Ld\n", rc, req->rq_xid); GOTO(out, rc); } } /* server has seen req, we have lost reply: -ERESTARTSYS */ if ( !(req->rq_flags & PTL_RPC_FL_REPLIED) && req->rq_xid <= conn->c_last_xid) { CDEBUG(D_INODE, "lost rep %Ld srv did req: restart " "[last rcvd %Ld]\n", req->rq_xid, conn->c_last_xid); ptlrpc_restart_req(req); } /* service has not seen req, no reply: resend */ if ( !(req->rq_flags & PTL_RPC_FL_REPLIED) && req->rq_xid > conn->c_last_xid) { CDEBUG(D_INODE, "lost rep/req %Ld: resend [last rcvd %Ld]\n", req->rq_xid, conn->c_last_xid); ptlrpc_resend_req(req); } } conn->c_level = LUSTRE_CONN_FULL; recovd_conn_fixed(conn); /* Finally, continue what we delayed since recovery started */ list_for_each_safe(tmp, pos, &conn->c_delayed_head) { req = list_entry(tmp, struct ptlrpc_request, rq_list); ptlrpc_continue_req(req); } EXIT; out: spin_unlock(&conn->c_lock); return rc; } int ll_recover(struct recovd_data *rd, int phase) { struct ptlrpc_connection *conn = class_rd2conn(rd); LASSERT(conn); ENTRY; switch (phase) { case PTLRPC_RECOVD_PHASE_PREPARE: RETURN(ll_recover_upcall(conn)); case PTLRPC_RECOVD_PHASE_RECOVER: RETURN(ll_recover_reconnect(conn)); case PTLRPC_RECOVD_PHASE_FAILURE: fixme(); RETURN(0); } LBUG(); RETURN(-ENOSYS); }