/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * Portal-RPC reconnection and replay operations, for use in recovery. * * This code is issued under the GNU General Public License. * See the file COPYING in this distribution * * Copyright (C) 1996 Peter J. Braam * Copyright (C) 1999 Stelias Computing Inc. * Copyright (C) 1999 Seagate Technology Inc. * Copyright (C) 2001 Mountain View Data, Inc. * Copyright (C) 2002 Cluster File Systems, Inc. * */ #include #include #include #define DEBUG_SUBSYSTEM S_RPC #include #include #include int ptlrpc_reconnect_import(struct obd_import *imp, int rq_opc, struct ptlrpc_request **reqptr) { struct obd_device *obd = imp->imp_obd; struct client_obd *cli = &obd->u.cli; int size[] = { sizeof(cli->cl_target_uuid), sizeof(obd->obd_uuid) }; char *tmp[] = {cli->cl_target_uuid, obd->obd_uuid }; struct ptlrpc_connection *conn = imp->imp_connection; struct lustre_handle old_hdl; struct ptlrpc_request *request; struct obd_export *ldlmexp; int rc; request = ptlrpc_prep_req(imp, rq_opc, 2, size, tmp); if (!request) RETURN(-ENOMEM); request->rq_level = LUSTRE_CONN_NEW; request->rq_replen = lustre_msg_size(0, NULL); /* * This address is the export that represents our client-side LDLM * service (for ASTs). We should only have one on this list, so we * just grab the first one. * * XXX tear down export, call class_obd_connect? */ ldlmexp = list_entry(obd->obd_exports.next, struct obd_export, exp_obd_chain); request->rq_reqmsg->addr = (__u64)(unsigned long)ldlmexp; request->rq_reqmsg->cookie = ldlmexp->exp_cookie; rc = ptlrpc_queue_wait(request); switch (rc) { case EALREADY: case -EALREADY: /* already connected! */ memset(&old_hdl, 0, sizeof(old_hdl)); if (!memcmp(&old_hdl.addr, &request->rq_repmsg->addr, sizeof (old_hdl.addr)) && !memcmp(&old_hdl.cookie, &request->rq_repmsg->cookie, sizeof (old_hdl.cookie))) { CERROR("%s@%s didn't like our handle "LPX64"/"LPX64", failed\n", cli->cl_target_uuid, conn->c_remote_uuid, (__u64)(unsigned long)ldlmexp, ldlmexp->exp_cookie); GOTO(out_disc, rc = -ENOTCONN); } old_hdl.addr = request->rq_repmsg->addr; old_hdl.cookie = request->rq_repmsg->cookie; if (memcmp(&imp->imp_handle, &old_hdl, sizeof(old_hdl))) { CERROR("%s@%s changed handle from "LPX64"/"LPX64" to "LPX64"/"LPX64"; " "copying, but this may foreshadow disaster\n", cli->cl_target_uuid, conn->c_remote_uuid, old_hdl.addr, old_hdl.cookie, imp->imp_handle.addr, imp->imp_handle.cookie); imp->imp_handle.addr = request->rq_repmsg->addr; imp->imp_handle.cookie = request->rq_repmsg->cookie; GOTO(out_disc, rc = EALREADY); } CERROR("reconnected to %s@%s after partition\n", cli->cl_target_uuid, conn->c_remote_uuid); GOTO(out_disc, rc = EALREADY); case 0: old_hdl = imp->imp_handle; imp->imp_handle.addr = request->rq_repmsg->addr; imp->imp_handle.cookie = request->rq_repmsg->cookie; CERROR("now connected to %s@%s ("LPX64"/"LPX64", was "LPX64"/"LPX64")!\n", cli->cl_target_uuid, conn->c_remote_uuid, imp->imp_handle.addr, imp->imp_handle.cookie, old_hdl.addr, old_hdl.cookie); GOTO(out_disc, rc = 0); default: CERROR("cannot connect to %s@%s: rc = %d\n", cli->cl_target_uuid, conn->c_remote_uuid, rc); GOTO(out_disc, rc = -ENOTCONN); /* XXX preserve rc? */ } out_disc: *reqptr = request; return rc; } int ptlrpc_run_recovery_upcall(struct ptlrpc_connection *conn) { char *argv[3]; char *envp[3]; int rc; ENTRY; 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; rc = call_usermodehelper(argv[0], argv, envp); if (rc < 0) { CERROR("Error invoking recovery upcall %s for %s: %d\n", argv[0], argv[1], rc); CERROR("Check /proc/sys/lustre/recovery_upcall?\n"); } else { CERROR("Invoked upcall %s for connection %s\n", argv[0], argv[1]); } /* * We don't want to make this a "failed" recovery, because the system * administrator -- or, perhaps, tester -- may well be able to rescue * things by running the correct upcall. */ RETURN(0); } int ptlrpc_replay(struct obd_import *imp) { int rc = 0; struct list_head *tmp, *pos; struct ptlrpc_request *req; unsigned long flags; __u64 committed = imp->imp_peer_committed_transno; ENTRY; /* It might have committed some after we last spoke, so make sure we * get rid of them now. */ spin_lock_irqsave(&imp->imp_lock, flags); ptlrpc_free_committed(imp); CDEBUG(D_HA, "import %p from %s has committed "LPD64"\n", imp, imp->imp_obd->u.cli.cl_target_uuid, committed); list_for_each(tmp, &imp->imp_replay_list) { req = list_entry(tmp, struct ptlrpc_request, rq_list); DEBUG_REQ(D_HA, req, "RETAINED: "); } list_for_each_safe(tmp, pos, &imp->imp_replay_list) { req = list_entry(tmp, struct ptlrpc_request, rq_list); DEBUG_REQ(D_HA, req, "REPLAY:"); /* XXX locking WRT failure during replay? */ rc = ptlrpc_replay_req(req); if (rc) { CERROR("recovery replay error %d for req "LPD64"\n", rc, req->rq_xid); GOTO(out, rc); } } out: spin_unlock_irqrestore(&imp->imp_lock, flags); return rc; } #define NO_RESEND 0 /* No action required. */ #define RESEND 1 /* Resend required. */ #define RESEND_IGNORE 2 /* Resend, ignore the reply (already saw it). */ #define RESTART 3 /* Have to restart the call, sorry! */ static int resend_type(struct ptlrpc_request *req, __u64 committed) { if (req->rq_transno && req->rq_transno < committed) { if (req->rq_flags & PTL_RPC_FL_REPLIED) { /* Saw the reply and it was committed, no biggie. */ DEBUG_REQ(D_HA, req, "NO_RESEND"); return NO_RESEND; } /* Request committed, but no reply: have to restart. */ return RESTART; } if (req->rq_flags & PTL_RPC_FL_REPLIED) { /* Saw reply, so resend and ignore new reply. */ return RESEND_IGNORE; } /* Didn't see reply either, so resend. */ return RESEND; } int ptlrpc_resend(struct obd_import *imp) { int rc = 0; struct list_head *tmp, *pos; struct ptlrpc_request *req; unsigned long flags; __u64 committed = imp->imp_peer_committed_transno; ENTRY; spin_lock_irqsave(&imp->imp_lock, flags); list_for_each(tmp, &imp->imp_sending_list) { req = list_entry(tmp, struct ptlrpc_request, rq_list); DEBUG_REQ(D_HA, req, "SENDING: "); } list_for_each_safe(tmp, pos, &imp->imp_sending_list) { req = list_entry(tmp, struct ptlrpc_request, rq_list); switch(resend_type(req, committed)) { case NO_RESEND: break; case RESTART: DEBUG_REQ(D_HA, req, "RESTART:"); ptlrpc_restart_req(req); break; case RESEND_IGNORE: DEBUG_REQ(D_HA, req, "RESEND_IGNORE:"); rc = ptlrpc_replay_req(req); if (rc) { DEBUG_REQ(D_ERROR, req, "error %d resending:", rc); ptlrpc_restart_req(req); /* might as well */ } break; case RESEND: DEBUG_REQ(D_HA, req, "RESEND:"); ptlrpc_resend_req(req); break; default: LBUG(); } } spin_unlock_irqrestore(&imp->imp_lock, flags); RETURN(rc); } void ptlrpc_wake_delayed(struct obd_import *imp) { unsigned long flags; struct list_head *tmp, *pos; struct ptlrpc_request *req; spin_lock_irqsave(&imp->imp_lock, flags); list_for_each_safe(tmp, pos, &imp->imp_delayed_list) { req = list_entry(tmp, struct ptlrpc_request, rq_list); DEBUG_REQ(D_HA, req, "waking:"); wake_up(&req->rq_wait_for_rep); } spin_unlock_irqrestore(&imp->imp_lock, flags); }