lustre/ptlrpc/lproc_ptlrpc.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2002 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of the Lustre file system, http://www.lustre.org
   7  *   Lustre is a trademark of Cluster File Systems, Inc.
   8  *
   9  *   You may have signed or agreed to another license before downloading
  10  *   this software.  If so, you are bound by the terms and conditions
  11  *   of that agreement, and the following does not apply to you.  See the
  12  *   LICENSE file included with this distribution for more information.
  13  *
  14  *   If you did not agree to a different license, then this copy of Lustre
  15  *   is open source software; you can redistribute it and/or modify it
  16  *   under the terms of version 2 of the GNU General Public License as
  17  *   published by the Free Software Foundation.
  18  *
  19  *   In either case, Lustre is distributed in the hope that it will be
  20  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  21  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *   license text for more details.
  23  *
  24  */
  25 #define DEBUG_SUBSYSTEM S_CLASS
  26
  27 #ifndef __KERNEL__
  28 # include <liblustre.h>
  29 #endif
  30
  31 #include <obd_support.h>
  32 #include <obd.h>
  33 #include <lprocfs_status.h>
  34 #include <lustre/lustre_idl.h>
  35 #include <lustre_net.h>
  36 #include <obd_class.h>
  37 #include "ptlrpc_internal.h"
  38
  39
  40 struct ll_rpc_opcode {
  41      __u32       opcode;
  42      const char *opname;
  43 } ll_rpc_opcode_table[LUSTRE_MAX_OPCODES] = {
  44         { OST_REPLY,        "ost_reply" },
  45         { OST_GETATTR,      "ost_getattr" },
  46         { OST_SETATTR,      "ost_setattr" },
  47         { OST_READ,         "ost_read" },
  48         { OST_WRITE,        "ost_write" },
  49         { OST_CREATE ,      "ost_create" },
  50         { OST_DESTROY,      "ost_destroy" },
  51         { OST_GET_INFO,     "ost_get_info" },
  52         { OST_CONNECT,      "ost_connect" },
  53         { OST_DISCONNECT,   "ost_disconnect" },
  54         { OST_PUNCH,        "ost_punch" },
  55         { OST_OPEN,         "ost_open" },
  56         { OST_CLOSE,        "ost_close" },
  57         { OST_STATFS,       "ost_statfs" },
  58         { 14,                NULL },    /* formerly OST_SAN_READ */
  59         { 15,                NULL },    /* formerly OST_SAN_WRITE */
  60         { OST_SYNC,         "ost_sync" },
  61         { OST_SET_INFO,     "ost_set_info" },
  62         { OST_QUOTACHECK,   "ost_quotacheck" },
  63         { OST_QUOTACTL,     "ost_quotactl" },
  64         { MDS_GETATTR,      "mds_getattr" },
  65         { MDS_GETATTR_NAME, "mds_getattr_lock" },
  66         { MDS_CLOSE,        "mds_close" },
  67         { MDS_REINT,        "mds_reint" },
  68         { MDS_READPAGE,     "mds_readpage" },
  69         { MDS_CONNECT,      "mds_connect" },
  70         { MDS_DISCONNECT,   "mds_disconnect" },
  71         { MDS_GETSTATUS,    "mds_getstatus" },
  72         { MDS_STATFS,       "mds_statfs" },
  73         { MDS_PIN,          "mds_pin" },
  74         { MDS_UNPIN,        "mds_unpin" },
  75         { MDS_SYNC,         "mds_sync" },
  76         { MDS_DONE_WRITING, "mds_done_writing" },
  77         { MDS_SET_INFO,     "mds_set_info" },
  78         { MDS_QUOTACHECK,   "mds_quotacheck" },
  79         { MDS_QUOTACTL,     "mds_quotactl" },
  80         { MDS_GETXATTR,     "mds_getxattr" },
  81         { MDS_SETXATTR,     "mds_setxattr" },
  82         { MDS_WRITEPAGE,    "mds_writepage" },
  83         { MDS_IS_SUBDIR,    "mds_is_subdir" },
  84         { LDLM_ENQUEUE,     "ldlm_enqueue" },
  85         { LDLM_CONVERT,     "ldlm_convert" },
  86         { LDLM_CANCEL,      "ldlm_cancel" },
  87         { LDLM_BL_CALLBACK, "ldlm_bl_callback" },
  88         { LDLM_CP_CALLBACK, "ldlm_cp_callback" },
  89         { LDLM_GL_CALLBACK, "ldlm_gl_callback" },
  90         { MGS_CONNECT,      "mgs_connect" },
  91         { MGS_DISCONNECT,   "mgs_disconnect" },
  92         { MGS_EXCEPTION,    "mgs_exception" },
  93         { MGS_TARGET_REG,   "mgs_target_reg" },
  94         { MGS_TARGET_DEL,   "mgs_target_del" },
  95         { MGS_SET_INFO,     "mgs_set_info" },
  96         { OBD_PING,         "obd_ping" },
  97         { OBD_LOG_CANCEL,   "llog_origin_handle_cancel" },
  98         { OBD_QC_CALLBACK,  "obd_qc_callback" },
  99         { LLOG_ORIGIN_HANDLE_CREATE,     "llog_origin_handle_create" },
 100         { LLOG_ORIGIN_HANDLE_NEXT_BLOCK, "llog_origin_handle_next_block" },
 101         { LLOG_ORIGIN_HANDLE_READ_HEADER,"llog_origin_handle_read_header" },
 102         { LLOG_ORIGIN_HANDLE_WRITE_REC,  "llog_origin_handle_write_rec" },
 103         { LLOG_ORIGIN_HANDLE_CLOSE,      "llog_origin_handle_close" },
 104         { LLOG_ORIGIN_CONNECT,           "llog_origin_connect" },
 105         { LLOG_CATINFO,                  "llog_catinfo" },
 106         { LLOG_ORIGIN_HANDLE_PREV_BLOCK, "llog_origin_handle_prev_block" },
 107         { LLOG_ORIGIN_HANDLE_DESTROY,    "llog_origin_handle_destroy" },
 108         { FLD_QUERY,        "fld_query" },
 109         { SEQ_QUERY,        "seq_query" },
 110         { SEC_CTX_INIT,     "sec_ctx_init" },
 111         { SEC_CTX_INIT_CONT,"sec_ctx_init_cont" },
 112         { SEC_CTX_FINI,     "sec_ctx_fini" }
 113 };
 114
 115 struct ll_eopcode {
 116      __u32       opcode;
 117      const char *opname;
 118 } ll_eopcode_table[EXTRA_LAST_OPC] = {
 119         { LDLM_GLIMPSE_ENQUEUE, "ldlm_glimpse_enqueue" },
 120         { LDLM_PLAIN_ENQUEUE,   "ldlm_plain_enqueue" },
 121         { LDLM_EXTENT_ENQUEUE,  "ldlm_extent_enqueue" },
 122         { LDLM_FLOCK_ENQUEUE,   "ldlm_flock_enqueue" },
 123         { LDLM_IBITS_ENQUEUE,   "ldlm_ibits_enqueue" },
 124         { MDS_REINT_CREATE,     "mds_reint_create" },
 125         { MDS_REINT_LINK,       "mds_reint_link" },
 126         { MDS_REINT_OPEN,       "mds_reint_open" },
 127         { MDS_REINT_SETATTR,    "mds_reint_setattr" },
 128         { MDS_REINT_RENAME,     "mds_reint_rename" },
 129         { MDS_REINT_UNLINK,     "mds_reint_unlink" }
 130 };
 131
 132 const char *ll_opcode2str(__u32 opcode)
 133 {
 134         /* When one of the assertions below fail, chances are that:
 135          *     1) A new opcode was added in lustre_idl.h, but was
 136          *        is missing from the table above.
 137          * or  2) The opcode space was renumbered or rearranged,
 138          *        and the opcode_offset() function in
 139          *        ptlrpc_internal.h needs to be modified.
 140          */
 141         __u32 offset = opcode_offset(opcode);
 142         LASSERT(offset < LUSTRE_MAX_OPCODES);
 143         LASSERT(ll_rpc_opcode_table[offset].opcode == opcode);
 144         return ll_rpc_opcode_table[offset].opname;
 145 }
 146
 147 const char* ll_eopcode2str(__u32 opcode)
 148 {
 149         LASSERT(ll_eopcode_table[opcode].opcode == opcode);
 150         return ll_eopcode_table[opcode].opname;
 151 }
 152 #ifdef LPROCFS
 153 void ptlrpc_lprocfs_register(struct proc_dir_entry *root, char *dir,
 154                              char *name, struct proc_dir_entry **procroot_ret,
 155                              struct lprocfs_stats **stats_ret)
 156 {
 157         struct proc_dir_entry *svc_procroot;
 158         struct lprocfs_stats *svc_stats;
 159         int i, rc;
 160         unsigned int svc_counter_config = LPROCFS_CNTR_AVGMINMAX |
 161                                           LPROCFS_CNTR_STDDEV;
 162
 163         LASSERT(*procroot_ret == NULL);
 164         LASSERT(*stats_ret == NULL);
 165
 166         svc_stats = lprocfs_alloc_stats(EXTRA_MAX_OPCODES + LUSTRE_MAX_OPCODES, 0);
 167         if (svc_stats == NULL)
 168                 return;
 169
 170         if (dir) {
 171                 svc_procroot = lprocfs_register(dir, root, NULL, NULL);
 172                 if (IS_ERR(svc_procroot)) {
 173                         lprocfs_free_stats(&svc_stats);
 174                         return;
 175                 }
 176         } else {
 177                 svc_procroot = root;
 178         }
 179
 180         lprocfs_counter_init(svc_stats, PTLRPC_REQWAIT_CNTR,
 181                              svc_counter_config, "req_waittime", "usec");
 182         lprocfs_counter_init(svc_stats, PTLRPC_REQQDEPTH_CNTR,
 183                              svc_counter_config, "req_qdepth", "reqs");
 184         lprocfs_counter_init(svc_stats, PTLRPC_REQACTIVE_CNTR,
 185                              svc_counter_config, "req_active", "reqs");
 186         lprocfs_counter_init(svc_stats, PTLRPC_REQBUF_AVAIL_CNTR,
 187                              svc_counter_config, "reqbuf_avail", "bufs");
 188         for (i = 0; i < EXTRA_LAST_OPC; i++) {
 189                 lprocfs_counter_init(svc_stats, PTLRPC_LAST_CNTR + i,
 190                                      svc_counter_config,
 191                                      ll_eopcode2str(i), "reqs");
 192         }
 193         for (i = 0; i < LUSTRE_MAX_OPCODES; i++) {
 194                 __u32 opcode = ll_rpc_opcode_table[i].opcode;
 195                 lprocfs_counter_init(svc_stats,
 196                                      EXTRA_MAX_OPCODES + i, svc_counter_config,
 197                                      ll_opcode2str(opcode), "usec");
 198         }
 199
 200         rc = lprocfs_register_stats(svc_procroot, name, svc_stats);
 201         if (rc < 0) {
 202                 if (dir)
 203                         lprocfs_remove(&svc_procroot);
 204                 lprocfs_free_stats(&svc_stats);
 205         } else {
 206                 if (dir)
 207                         *procroot_ret = svc_procroot;
 208                 *stats_ret = svc_stats;
 209         }
 210 }
 211
 212 static int
 213 ptlrpc_lprocfs_read_req_history_len(char *page, char **start, off_t off,
 214                                     int count, int *eof, void *data)
 215 {
 216         struct ptlrpc_service *svc = data;
 217
 218         *eof = 1;
 219         return snprintf(page, count, "%d\n", svc->srv_n_history_rqbds);
 220 }
 221
 222 static int
 223 ptlrpc_lprocfs_read_req_history_max(char *page, char **start, off_t off,
 224                                     int count, int *eof, void *data)
 225 {
 226         struct ptlrpc_service *svc = data;
 227
 228         *eof = 1;
 229         return snprintf(page, count, "%d\n", svc->srv_max_history_rqbds);
 230 }
 231
 232 static int
 233 ptlrpc_lprocfs_write_req_history_max(struct file *file, const char *buffer,
 234                                      unsigned long count, void *data)
 235 {
 236         struct ptlrpc_service *svc = data;
 237         int                    bufpages;
 238         int                    val;
 239         int                    rc = lprocfs_write_helper(buffer, count, &val);
 240
 241         if (rc < 0)
 242                 return rc;
 243
 244         if (val < 0)
 245                 return -ERANGE;
 246
 247         /* This sanity check is more of an insanity check; we can still
 248          * hose a kernel by allowing the request history to grow too
 249          * far. */
 250         bufpages = (svc->srv_buf_size + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
 251         if (val > num_physpages/(2 * bufpages))
 252                 return -ERANGE;
 253
 254         spin_lock(&svc->srv_lock);
 255         svc->srv_max_history_rqbds = val;
 256         spin_unlock(&svc->srv_lock);
 257
 258         return count;
 259 }
 260
 261 struct ptlrpc_srh_iterator {
 262         __u64                  srhi_seq;
 263         struct ptlrpc_request *srhi_req;
 264 };
 265
 266 int
 267 ptlrpc_lprocfs_svc_req_history_seek(struct ptlrpc_service *svc,
 268                                     struct ptlrpc_srh_iterator *srhi,
 269                                     __u64 seq)
 270 {
 271         struct list_head      *e;
 272         struct ptlrpc_request *req;
 273
 274         if (srhi->srhi_req != NULL &&
 275             srhi->srhi_seq > svc->srv_request_max_cull_seq &&
 276             srhi->srhi_seq <= seq) {
 277                 /* If srhi_req was set previously, hasn't been culled and
 278                  * we're searching for a seq on or after it (i.e. more
 279                  * recent), search from it onwards.
 280                  * Since the service history is LRU (i.e. culled reqs will
 281                  * be near the head), we shouldn't have to do long
 282                  * re-scans */
 283                 LASSERT (srhi->srhi_seq == srhi->srhi_req->rq_history_seq);
 284                 LASSERT (!list_empty(&svc->srv_request_history));
 285                 e = &srhi->srhi_req->rq_history_list;
 286         } else {
 287                 /* search from start */
 288                 e = svc->srv_request_history.next;
 289         }
 290
 291         while (e != &svc->srv_request_history) {
 292                 req = list_entry(e, struct ptlrpc_request, rq_history_list);
 293
 294                 if (req->rq_history_seq >= seq) {
 295                         srhi->srhi_seq = req->rq_history_seq;
 296                         srhi->srhi_req = req;
 297                         return 0;
 298                 }
 299                 e = e->next;
 300         }
 301
 302         return -ENOENT;
 303 }
 304
 305 static void *
 306 ptlrpc_lprocfs_svc_req_history_start(struct seq_file *s, loff_t *pos)
 307 {
 308         struct ptlrpc_service       *svc = s->private;
 309         struct ptlrpc_srh_iterator  *srhi;
 310         int                          rc;
 311
 312         OBD_ALLOC(srhi, sizeof(*srhi));
 313         if (srhi == NULL)
 314                 return NULL;
 315
 316         srhi->srhi_seq = 0;
 317         srhi->srhi_req = NULL;
 318
 319         spin_lock(&svc->srv_lock);
 320         rc = ptlrpc_lprocfs_svc_req_history_seek(svc, srhi, *pos);
 321         spin_unlock(&svc->srv_lock);
 322
 323         if (rc == 0) {
 324                 *pos = srhi->srhi_seq;
 325                 return srhi;
 326         }
 327
 328         OBD_FREE(srhi, sizeof(*srhi));
 329         return NULL;
 330 }
 331
 332 static void
 333 ptlrpc_lprocfs_svc_req_history_stop(struct seq_file *s, void *iter)
 334 {
 335         struct ptlrpc_srh_iterator *srhi = iter;
 336
 337         if (srhi != NULL)
 338                 OBD_FREE(srhi, sizeof(*srhi));
 339 }
 340
 341 static void *
 342 ptlrpc_lprocfs_svc_req_history_next(struct seq_file *s,
 343                                     void *iter, loff_t *pos)
 344 {
 345         struct ptlrpc_service       *svc = s->private;
 346         struct ptlrpc_srh_iterator  *srhi = iter;
 347         int                          rc;
 348
 349         spin_lock(&svc->srv_lock);
 350         rc = ptlrpc_lprocfs_svc_req_history_seek(svc, srhi, *pos + 1);
 351         spin_unlock(&svc->srv_lock);
 352
 353         if (rc != 0) {
 354                 OBD_FREE(srhi, sizeof(*srhi));
 355                 return NULL;
 356         }
 357
 358         *pos = srhi->srhi_seq;
 359         return srhi;
 360 }
 361
 362 static int ptlrpc_lprocfs_svc_req_history_show(struct seq_file *s, void *iter)
 363 {
 364         struct ptlrpc_service      *svc = s->private;
 365         struct ptlrpc_srh_iterator *srhi = iter;
 366         struct ptlrpc_request      *req;
 367         int                         rc;
 368
 369         spin_lock(&svc->srv_lock);
 370
 371         rc = ptlrpc_lprocfs_svc_req_history_seek(svc, srhi, srhi->srhi_seq);
 372
 373         if (rc == 0) {
 374                 req = srhi->srhi_req;
 375
 376                 /* Print common req fields.
 377                  * CAVEAT EMPTOR: we're racing with the service handler
 378                  * here.  The request could contain any old crap, so you
 379                  * must be just as careful as the service's request
 380                  * parser. Currently I only print stuff here I know is OK
 381                  * to look at coz it was set up in request_in_callback()!!! */
 382                 seq_printf(s, LPD64":%s:%s:"LPD64":%d:%s ",
 383                            req->rq_history_seq, libcfs_nid2str(req->rq_self),
 384                            libcfs_id2str(req->rq_peer), req->rq_xid,
 385                            req->rq_reqlen,ptlrpc_rqphase2str(req));
 386
 387                 if (svc->srv_request_history_print_fn == NULL)
 388                         seq_printf(s, "\n");
 389                 else
 390                         svc->srv_request_history_print_fn(s, srhi->srhi_req);
 391         }
 392
 393         spin_unlock(&svc->srv_lock);
 394
 395         return rc;
 396 }
 397
 398 static int
 399 ptlrpc_lprocfs_svc_req_history_open(struct inode *inode, struct file *file)
 400 {
 401         static struct seq_operations sops = {
 402                 .start = ptlrpc_lprocfs_svc_req_history_start,
 403                 .stop  = ptlrpc_lprocfs_svc_req_history_stop,
 404                 .next  = ptlrpc_lprocfs_svc_req_history_next,
 405                 .show  = ptlrpc_lprocfs_svc_req_history_show,
 406         };
 407         struct proc_dir_entry *dp = PDE(inode);
 408         struct seq_file       *seqf;
 409         int                    rc;
 410
 411         LPROCFS_ENTRY_AND_CHECK(dp);
 412         rc = seq_open(file, &sops);
 413         if (rc) {
 414                 LPROCFS_EXIT();
 415                 return rc;
 416         }
 417
 418         seqf = file->private_data;
 419         seqf->private = dp->data;
 420         return 0;
 421 }
 422
 423 void ptlrpc_lprocfs_register_service(struct proc_dir_entry *entry,
 424                                      struct ptlrpc_service *svc)
 425 {
 426         struct lprocfs_vars lproc_vars[] = {
 427                 {.name       = "req_buffer_history_len",
 428                  .write_fptr = NULL,
 429                  .read_fptr  = ptlrpc_lprocfs_read_req_history_len,
 430                  .data       = svc},
 431                 {.name       = "req_buffer_history_max",
 432                  .write_fptr = ptlrpc_lprocfs_write_req_history_max,
 433                  .read_fptr  = ptlrpc_lprocfs_read_req_history_max,
 434                  .data       = svc},
 435                 {NULL}
 436         };
 437         static struct file_operations req_history_fops = {
 438                 .owner       = THIS_MODULE,
 439                 .open        = ptlrpc_lprocfs_svc_req_history_open,
 440                 .read        = seq_read,
 441                 .llseek      = seq_lseek,
 442                 .release     = lprocfs_seq_release,
 443         };
 444         struct proc_dir_entry *req_history;
 445
 446         ptlrpc_lprocfs_register(entry, svc->srv_name,
 447                                 "stats", &svc->srv_procroot,
 448                                 &svc->srv_stats);
 449
 450         if (svc->srv_procroot == NULL)
 451                 return;
 452
 453         lprocfs_add_vars(svc->srv_procroot, lproc_vars, NULL);
 454
 455         req_history = create_proc_entry("req_history", 0400,
 456                                         svc->srv_procroot);
 457         if (req_history != NULL) {
 458                 req_history->data = svc;
 459                 req_history->proc_fops = &req_history_fops;
 460         }
 461 }
 462
 463 void ptlrpc_lprocfs_register_obd(struct obd_device *obddev)
 464 {
 465         ptlrpc_lprocfs_register(obddev->obd_proc_entry, NULL, "stats",
 466                                 &obddev->obd_svc_procroot,
 467                                 &obddev->obd_svc_stats);
 468 }
 469 EXPORT_SYMBOL(ptlrpc_lprocfs_register_obd);
 470
 471 void ptlrpc_lprocfs_rpc_sent(struct ptlrpc_request *req)
 472 {
 473         struct lprocfs_stats *svc_stats;
 474         __u32 op = lustre_msg_get_opc(req->rq_reqmsg);
 475         int opc = opcode_offset(op);
 476
 477         svc_stats = req->rq_import->imp_obd->obd_svc_stats;
 478         if (svc_stats == NULL || opc <= 0)
 479                 return;
 480         LASSERT(opc < LUSTRE_MAX_OPCODES);
 481         /* These two use the ptlrpc_lprocfs_brw below */
 482         if (!(opc == OST_WRITE || opc == OST_READ || op == LDLM_ENQUEUE
 483               || op == MDS_REINT))
 484                 lprocfs_counter_add(svc_stats, opc + EXTRA_MAX_OPCODES, 0);
 485 }
 486
 487 void ptlrpc_lprocfs_brw(struct ptlrpc_request *req, int opc, int bytes)
 488 {
 489         struct lprocfs_stats *svc_stats;
 490         svc_stats = req->rq_import->imp_obd->obd_svc_stats;
 491         if (!svc_stats)
 492                 return;
 493         lprocfs_counter_add(svc_stats, opc + EXTRA_MAX_OPCODES, bytes);
 494 }
 495 EXPORT_SYMBOL(ptlrpc_lprocfs_brw);
 496
 497 void ptlrpc_lprocfs_unregister_service(struct ptlrpc_service *svc)
 498 {
 499         if (svc->srv_procroot != NULL)
 500                 lprocfs_remove(&svc->srv_procroot);
 501
 502         if (svc->srv_stats)
 503                 lprocfs_free_stats(&svc->srv_stats);
 504 }
 505
 506 void ptlrpc_lprocfs_unregister_obd(struct obd_device *obd)
 507 {
 508         if (obd->obd_svc_procroot)
 509                 lprocfs_remove(&obd->obd_svc_procroot);
 510
 511         if (obd->obd_svc_stats)
 512                 lprocfs_free_stats(&obd->obd_svc_stats);
 513 }
 514 EXPORT_SYMBOL(ptlrpc_lprocfs_unregister_obd);
 515
 516
 517 int lprocfs_wr_evict_client(struct file *file, const char *buffer,
 518                             unsigned long count, void *data)
 519 {
 520         struct obd_device *obd = data;
 521         char tmpbuf[sizeof(struct obd_uuid)];
 522
 523         /* Kludge code(deadlock situation): the lprocfs lock has been held
 524          * since the client is evicted by writting client's
 525          * uuid/nid to procfs "evict_client" entry. However,
 526          * obd_export_evict_by_uuid() will call lprocfs_remove() to destroy
 527          * the proc entries under the being destroyed export{}, so I have
 528          * to drop the lock at first here.
 529          * - jay, jxiong@clusterfs.com */
 530         class_incref(obd);
 531         LPROCFS_EXIT();
 532
 533         sscanf(buffer, "%40s", tmpbuf);
 534         if (strncmp(tmpbuf, "nid:", 4) == 0)
 535                 obd_export_evict_by_nid(obd, tmpbuf + 4);
 536         else if (strncmp(tmpbuf, "uuid:", 5) == 0)
 537                 obd_export_evict_by_uuid(obd, tmpbuf + 5);
 538         else
 539                 obd_export_evict_by_uuid(obd, tmpbuf);
 540
 541         LPROCFS_ENTRY();
 542         class_decref(obd);
 543
 544         return count;
 545 }
 546 EXPORT_SYMBOL(lprocfs_wr_evict_client);
 547
 548 int lprocfs_wr_ping(struct file *file, const char *buffer,
 549                     unsigned long count, void *data)
 550 {
 551         struct obd_device     *obd = data;
 552         struct ptlrpc_request *req;
 553         int                    rc;
 554         ENTRY;
 555
 556         LPROCFS_CLIMP_CHECK(obd);
 557         req = ptlrpc_request_alloc_pack(obd->u.cli.cl_import, &RQF_OBD_PING,
 558                                         LUSTRE_OBD_VERSION, OBD_PING);
 559
 560         LPROCFS_CLIMP_EXIT(obd);
 561         if (req == NULL)
 562                 RETURN(-ENOMEM);
 563
 564         ptlrpc_request_set_replen(req);
 565         req->rq_send_state = LUSTRE_IMP_FULL;
 566         req->rq_no_resend = 1;
 567         req->rq_no_delay = 1;
 568
 569         rc = ptlrpc_queue_wait(req);
 570
 571         ptlrpc_req_finished(req);
 572         if (rc >= 0)
 573                 RETURN(count);
 574         RETURN(rc);
 575 }
 576 EXPORT_SYMBOL(lprocfs_wr_ping);
 577
 578 #endif /* LPROCFS */