lustre/ptlrpc/recover.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Portal-RPC reconnection and replay operations, for use in recovery.
   5  *
   6  * This code is issued under the GNU General Public License.
   7  * See the file COPYING in this distribution
   8  *
   9  * Copyright (C) 1996 Peter J. Braam <braam@stelias.com>
  10  * Copyright (C) 1999 Stelias Computing Inc. <braam@stelias.com>
  11  * Copyright (C) 1999 Seagate Technology Inc.
  12  * Copyright (C) 2001 Mountain View Data, Inc.
  13  * Copyright (C) 2002 Cluster File Systems, Inc.
  14  *
  15  */
  16
  17 #include <linux/config.h>
  18 #include <linux/module.h>
  19 #include <linux/kmod.h>
  20
  21 #define DEBUG_SUBSYSTEM S_RPC
  22
  23 #include <linux/lustre_ha.h>
  24 #include <linux/lustre_net.h>
  25 #include <linux/obd.h>
  26
  27 int ptlrpc_reconnect_import(struct obd_import *imp, int rq_opc,
  28                             struct ptlrpc_request **reqptr)
  29 {
  30         struct obd_device *obd = imp->imp_obd;
  31         struct client_obd *cli = &obd->u.cli;
  32         int size[] = { sizeof(cli->cl_target_uuid), sizeof(obd->obd_uuid) };
  33         char *tmp[] = {cli->cl_target_uuid, obd->obd_uuid };
  34         struct ptlrpc_connection *conn = imp->imp_connection;
  35         struct lustre_handle old_hdl;
  36         struct ptlrpc_request *request;
  37         struct obd_export *ldlmexp;
  38         int rc;
  39
  40         request = ptlrpc_prep_req(imp, rq_opc, 2, size, tmp);
  41         if (!request)
  42                 RETURN(-ENOMEM);
  43         request->rq_level = LUSTRE_CONN_NEW;
  44         request->rq_replen = lustre_msg_size(0, NULL);
  45         /*
  46          * This address is the export that represents our client-side LDLM
  47          * service (for ASTs).  We should only have one on this list, so we
  48          * just grab the first one.
  49          *
  50          * XXX tear down export, call class_obd_connect?
  51          */
  52         ldlmexp = list_entry(obd->obd_exports.next, struct obd_export,
  53                              exp_obd_chain);
  54         request->rq_reqmsg->addr = (__u64)(unsigned long)ldlmexp;
  55         request->rq_reqmsg->cookie = ldlmexp->exp_cookie;
  56         rc = ptlrpc_queue_wait(request);
  57         switch (rc) {
  58             case EALREADY:
  59             case -EALREADY:
  60                 /* already connected! */
  61                 memset(&old_hdl, 0, sizeof(old_hdl));
  62                 if (!memcmp(&old_hdl.addr, &request->rq_repmsg->addr,
  63                             sizeof (old_hdl.addr)) &&
  64                     !memcmp(&old_hdl.cookie, &request->rq_repmsg->cookie,
  65                             sizeof (old_hdl.cookie))) {
  66                         CERROR("%s@%s didn't like our handle "LPX64"/"LPX64", failed\n",
  67                                cli->cl_target_uuid, conn->c_remote_uuid,
  68                                (__u64)(unsigned long)ldlmexp,
  69                                ldlmexp->exp_cookie);
  70                         GOTO(out_disc, rc = -ENOTCONN);
  71                 }
  72
  73                 old_hdl.addr = request->rq_repmsg->addr;
  74                 old_hdl.cookie = request->rq_repmsg->cookie;
  75                 if (memcmp(&imp->imp_handle, &old_hdl, sizeof(old_hdl))) {
  76                         CERROR("%s@%s changed handle from "LPX64"/"LPX64" to "LPX64"/"LPX64"; "
  77                                "copying, but this may foreshadow disaster\n",
  78                                cli->cl_target_uuid, conn->c_remote_uuid,
  79                                old_hdl.addr, old_hdl.cookie,
  80                                imp->imp_handle.addr, imp->imp_handle.cookie);
  81                         imp->imp_handle.addr = request->rq_repmsg->addr;
  82                         imp->imp_handle.cookie = request->rq_repmsg->cookie;
  83                         GOTO(out_disc, rc = EALREADY);
  84                 }
  85
  86                 CERROR("reconnected to %s@%s after partition\n",
  87                        cli->cl_target_uuid, conn->c_remote_uuid);
  88                 GOTO(out_disc, rc = EALREADY);
  89             case 0:
  90                 old_hdl = imp->imp_handle;
  91                 imp->imp_handle.addr = request->rq_repmsg->addr;
  92                 imp->imp_handle.cookie = request->rq_repmsg->cookie;
  93                 CERROR("now connected to %s@%s ("LPX64"/"LPX64", was "LPX64"/"LPX64")!\n",
  94                        cli->cl_target_uuid, conn->c_remote_uuid,
  95                        imp->imp_handle.addr, imp->imp_handle.cookie,
  96                        old_hdl.addr, old_hdl.cookie);
  97                 GOTO(out_disc, rc = 0);
  98             default:
  99                 CERROR("cannot connect to %s@%s: rc = %d\n",
 100                        cli->cl_target_uuid, conn->c_remote_uuid, rc);
 101                 GOTO(out_disc, rc = -ENOTCONN); /* XXX preserve rc? */
 102         }
 103
 104  out_disc:
 105         *reqptr = request;
 106         return rc;
 107 }
 108
 109 int ptlrpc_run_recovery_upcall(struct ptlrpc_connection *conn)
 110 {
 111         char *argv[3];
 112         char *envp[3];
 113         int rc;
 114
 115         ENTRY;
 116         argv[0] = obd_recovery_upcall;
 117         argv[1] = conn->c_remote_uuid;
 118         argv[2] = NULL;
 119
 120         envp[0] = "HOME=/";
 121         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 122         envp[2] = NULL;
 123
 124         rc = call_usermodehelper(argv[0], argv, envp);
 125         if (rc < 0) {
 126                 CERROR("Error invoking recovery upcall %s for %s: %d\n",
 127                        argv[0], argv[1], rc);
 128                 CERROR("Check /proc/sys/lustre/recovery_upcall?\n");
 129         } else {
 130                 CERROR("Invoked upcall %s for connection %s\n",
 131                        argv[0], argv[1]);
 132         }
 133
 134         /*
 135          * We don't want to make this a "failed" recovery, because the system
 136          * administrator -- or, perhaps, tester -- may well be able to rescue
 137          * things by running the correct upcall.
 138          */
 139         RETURN(0);
 140 }
 141
 142 int ptlrpc_replay(struct obd_import *imp)
 143 {
 144         int rc = 0;
 145         struct list_head *tmp, *pos;
 146         struct ptlrpc_request *req;
 147         unsigned long flags;
 148         __u64 committed = imp->imp_peer_committed_transno;
 149         ENTRY;
 150
 151         /* It might have committed some after we last spoke, so make sure we
 152          * get rid of them now.
 153          */
 154         spin_lock_irqsave(&imp->imp_lock, flags);
 155
 156         ptlrpc_free_committed(imp);
 157
 158         CDEBUG(D_HA, "import %p from %s has committed "LPD64"\n",
 159                imp, imp->imp_obd->u.cli.cl_target_uuid, committed);
 160
 161         list_for_each(tmp, &imp->imp_replay_list) {
 162                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 163                 DEBUG_REQ(D_HA, req, "RETAINED: ");
 164         }
 165
 166         list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
 167                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 168
 169                 DEBUG_REQ(D_HA, req, "REPLAY:");
 170
 171                 /* XXX locking WRT failure during replay? */
 172                 rc = ptlrpc_replay_req(req);
 173
 174                 if (rc) {
 175                         CERROR("recovery replay error %d for req "LPD64"\n",
 176                                rc, req->rq_xid);
 177                         GOTO(out, rc);
 178                 }
 179         }
 180
 181  out:
 182         spin_unlock_irqrestore(&imp->imp_lock, flags);
 183         return rc;
 184 }
 185
 186 #define NO_RESEND     0 /* No action required. */
 187 #define RESEND        1 /* Resend required. */
 188 #define RESEND_IGNORE 2 /* Resend, ignore the reply (already saw it). */
 189 #define RESTART       3 /* Have to restart the call, sorry! */
 190
 191 static int resend_type(struct ptlrpc_request *req, __u64 committed)
 192 {
 193         if (req->rq_transno && req->rq_transno < committed) {
 194                 if (req->rq_flags & PTL_RPC_FL_REPLIED) {
 195                         /* Saw the reply and it was committed, no biggie. */
 196                         DEBUG_REQ(D_HA, req, "NO_RESEND");
 197                         return NO_RESEND;
 198                 }
 199                 /* Request committed, but no reply: have to restart. */
 200                 return RESTART;
 201         }
 202
 203         if (req->rq_flags & PTL_RPC_FL_REPLIED) {
 204                 /* Saw reply, so resend and ignore new reply. */
 205                 return RESEND_IGNORE;
 206         }
 207
 208         /* Didn't see reply either, so resend. */
 209         return RESEND;
 210
 211 }
 212
 213 int ptlrpc_resend(struct obd_import *imp)
 214 {
 215         int rc = 0;
 216         struct list_head *tmp, *pos;
 217         struct ptlrpc_request *req;
 218         unsigned long flags;
 219         __u64 committed = imp->imp_peer_committed_transno;
 220
 221         ENTRY;
 222
 223         spin_lock_irqsave(&imp->imp_lock, flags);
 224         list_for_each(tmp, &imp->imp_sending_list) {
 225                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 226                 DEBUG_REQ(D_HA, req, "SENDING: ");
 227         }
 228
 229         list_for_each_safe(tmp, pos, &imp->imp_sending_list) {
 230                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 231
 232                 switch(resend_type(req, committed)) {
 233                     case NO_RESEND:
 234                         break;
 235
 236                     case RESTART:
 237                         DEBUG_REQ(D_HA, req, "RESTART:");
 238                         ptlrpc_restart_req(req);
 239                         break;
 240
 241                     case RESEND_IGNORE:
 242                         DEBUG_REQ(D_HA, req, "RESEND_IGNORE:");
 243                         rc = ptlrpc_replay_req(req);
 244                         if (rc) {
 245                                 DEBUG_REQ(D_ERROR, req, "error %d resending:",
 246                                           rc);
 247                                 ptlrpc_restart_req(req); /* might as well */
 248                         }
 249                         break;
 250
 251                     case RESEND:
 252                         DEBUG_REQ(D_HA, req, "RESEND:");
 253                         ptlrpc_resend_req(req);
 254                         break;
 255
 256                     default:
 257                         LBUG();
 258                 }
 259         }
 260
 261         spin_unlock_irqrestore(&imp->imp_lock, flags);
 262         RETURN(rc);
 263 }
 264
 265 void ptlrpc_wake_delayed(struct obd_import *imp)
 266 {
 267         unsigned long flags;
 268         struct list_head *tmp, *pos;
 269         struct ptlrpc_request *req;
 270
 271         spin_lock_irqsave(&imp->imp_lock, flags);
 272         list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
 273                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 274                 DEBUG_REQ(D_HA, req, "waking:");
 275                 wake_up(&req->rq_wait_for_rep);
 276         }
 277         spin_unlock_irqrestore(&imp->imp_lock, flags);
 278 }