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         { LDLM_ENQUEUE,     "ldlm_enqueue" },
  83         { LDLM_CONVERT,     "ldlm_convert" },
  84         { LDLM_CANCEL,      "ldlm_cancel" },
  85         { LDLM_BL_CALLBACK, "ldlm_bl_callback" },
  86         { LDLM_CP_CALLBACK, "ldlm_cp_callback" },
  87         { LDLM_GL_CALLBACK, "ldlm_gl_callback" },
  88         { MGS_CONNECT,      "mgs_connect" },
  89         { MGS_DISCONNECT,   "mgs_disconnect" },
  90         { MGS_EXCEPTION,    "mgs_exception" },
  91         { MGS_TARGET_REG,   "mgs_target_reg" },
  92         { MGS_TARGET_DEL,   "mgs_target_del" },
  93         { MGS_SET_INFO,     "mgs_set_info" },
  94         { OBD_PING,         "obd_ping" },
  95         { OBD_LOG_CANCEL,   "llog_origin_handle_cancel" },
  96         { OBD_QC_CALLBACK,  "obd_quota_callback" },
  97         { LLOG_ORIGIN_HANDLE_CREATE,     "llog_origin_handle_create" },
  98         { LLOG_ORIGIN_HANDLE_NEXT_BLOCK, "llog_origin_handle_next_block"},
  99         { LLOG_ORIGIN_HANDLE_READ_HEADER,"llog_origin_handle_read_header" },
 100         { LLOG_ORIGIN_HANDLE_WRITE_REC,  "llog_origin_handle_write_rec" },
 101         { LLOG_ORIGIN_HANDLE_CLOSE,      "llog_origin_handle_close" },
 102         { LLOG_ORIGIN_CONNECT,           "llog_origin_connect" },
 103         { LLOG_CATINFO,                  "llog_catinfo" },
 104         { LLOG_ORIGIN_HANDLE_PREV_BLOCK, "llog_origin_handle_prev_block" },
 105         { LLOG_ORIGIN_HANDLE_DESTROY,    "llog_origin_handle_destroy" },
 106 };
 107
 108 const char* ll_opcode2str(__u32 opcode)
 109 {
 110         /* When one of the assertions below fail, chances are that:
 111          *     1) A new opcode was added in lustre_idl.h, but was
 112          *        is missing from the table above.
 113          * or  2) The opcode space was renumbered or rearranged,
 114          *        and the opcode_offset() function in
 115          *        ptlrpc_internal.h needs to be modified.
 116          */
 117         __u32 offset = opcode_offset(opcode);
 118         LASSERT(offset < LUSTRE_MAX_OPCODES);
 119         LASSERT(ll_rpc_opcode_table[offset].opcode == opcode);
 120         return ll_rpc_opcode_table[offset].opname;
 121 }
 122
 123 #ifdef LPROCFS
 124 void ptlrpc_lprocfs_register(struct proc_dir_entry *root, char *dir,
 125                              char *name, struct proc_dir_entry **procroot_ret,
 126                              struct lprocfs_stats **stats_ret)
 127 {
 128         struct proc_dir_entry *svc_procroot;
 129         struct lprocfs_stats *svc_stats;
 130         int i, rc;
 131         unsigned int svc_counter_config = LPROCFS_CNTR_AVGMINMAX |
 132                                           LPROCFS_CNTR_STDDEV;
 133
 134         LASSERT(*procroot_ret == NULL);
 135         LASSERT(*stats_ret == NULL);
 136
 137         svc_stats = lprocfs_alloc_stats(PTLRPC_LAST_CNTR + LUSTRE_MAX_OPCODES, 0);
 138         if (svc_stats == NULL)
 139                 return;
 140
 141         if (dir) {
 142                 svc_procroot = lprocfs_register(dir, root, NULL, NULL);
 143                 if (IS_ERR(svc_procroot)) {
 144                         lprocfs_free_stats(&svc_stats);
 145                         return;
 146                 }
 147         } else {
 148                 svc_procroot = root;
 149         }
 150
 151         lprocfs_counter_init(svc_stats, PTLRPC_REQWAIT_CNTR,
 152                              svc_counter_config, "req_waittime", "usec");
 153         lprocfs_counter_init(svc_stats, PTLRPC_REQQDEPTH_CNTR,
 154                              svc_counter_config, "req_qdepth", "reqs");
 155         lprocfs_counter_init(svc_stats, PTLRPC_REQACTIVE_CNTR,
 156                              svc_counter_config, "req_active", "reqs");
 157         lprocfs_counter_init(svc_stats, PTLRPC_TIMEOUT,
 158                              svc_counter_config, "adaptive_timeout", "sec");
 159         lprocfs_counter_init(svc_stats, PTLRPC_REQBUF_AVAIL_CNTR,
 160                              svc_counter_config, "reqbuf_avail", "bufs");
 161         for (i = 0; i < LUSTRE_MAX_OPCODES; i++) {
 162                 __u32 opcode = ll_rpc_opcode_table[i].opcode;
 163                 lprocfs_counter_init(svc_stats, PTLRPC_LAST_CNTR + i,
 164                                      svc_counter_config, ll_opcode2str(opcode),
 165                                      "usec");
 166         }
 167
 168         rc = lprocfs_register_stats(svc_procroot, name, svc_stats);
 169         if (rc < 0) {
 170                 if (dir)
 171                         lprocfs_remove(&svc_procroot);
 172                 lprocfs_free_stats(&svc_stats);
 173         } else {
 174                 if (dir)
 175                         *procroot_ret = svc_procroot;
 176                 *stats_ret = svc_stats;
 177         }
 178 }
 179
 180 static int
 181 ptlrpc_lprocfs_read_req_history_len(char *page, char **start, off_t off,
 182                                     int count, int *eof, void *data)
 183 {
 184         struct ptlrpc_service *svc = data;
 185
 186         *eof = 1;
 187         return snprintf(page, count, "%d\n", svc->srv_n_history_rqbds);
 188 }
 189
 190 static int
 191 ptlrpc_lprocfs_read_req_history_max(char *page, char **start, off_t off,
 192                                     int count, int *eof, void *data)
 193 {
 194         struct ptlrpc_service *svc = data;
 195
 196         *eof = 1;
 197         return snprintf(page, count, "%d\n", svc->srv_max_history_rqbds);
 198 }
 199
 200 static int
 201 ptlrpc_lprocfs_write_req_history_max(struct file *file, const char *buffer,
 202                                      unsigned long count, void *data)
 203 {
 204         struct ptlrpc_service *svc = data;
 205         int                    bufpages;
 206         int                    val;
 207         int                    rc = lprocfs_write_helper(buffer, count, &val);
 208
 209         if (rc < 0)
 210                 return rc;
 211
 212         if (val < 0)
 213                 return -ERANGE;
 214
 215         /* This sanity check is more of an insanity check; we can still
 216          * hose a kernel by allowing the request history to grow too
 217          * far. */
 218         bufpages = (svc->srv_buf_size + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
 219         if (val > num_physpages/(2*bufpages))
 220                 return -ERANGE;
 221
 222         spin_lock(&svc->srv_lock);
 223         svc->srv_max_history_rqbds = val;
 224         spin_unlock(&svc->srv_lock);
 225
 226         return count;
 227 }
 228
 229 struct ptlrpc_srh_iterator {
 230         __u64                  srhi_seq;
 231         struct ptlrpc_request *srhi_req;
 232 };
 233
 234 int
 235 ptlrpc_lprocfs_svc_req_history_seek(struct ptlrpc_service *svc,
 236                                     struct ptlrpc_srh_iterator *srhi,
 237                                     __u64 seq)
 238 {
 239         struct list_head      *e;
 240         struct ptlrpc_request *req;
 241
 242         if (srhi->srhi_req != NULL &&
 243             srhi->srhi_seq > svc->srv_request_max_cull_seq &&
 244             srhi->srhi_seq <= seq) {
 245                 /* If srhi_req was set previously, hasn't been culled and
 246                  * we're searching for a seq on or after it (i.e. more
 247                  * recent), search from it onwards.
 248                  * Since the service history is LRU (i.e. culled reqs will
 249                  * be near the head), we shouldn't have to do long
 250                  * re-scans */
 251                 LASSERT (srhi->srhi_seq == srhi->srhi_req->rq_history_seq);
 252                 LASSERT (!list_empty(&svc->srv_request_history));
 253                 e = &srhi->srhi_req->rq_history_list;
 254         } else {
 255                 /* search from start */
 256                 e = svc->srv_request_history.next;
 257         }
 258
 259         while (e != &svc->srv_request_history) {
 260                 req = list_entry(e, struct ptlrpc_request, rq_history_list);
 261
 262                 if (req->rq_history_seq >= seq) {
 263                         srhi->srhi_seq = req->rq_history_seq;
 264                         srhi->srhi_req = req;
 265                         return 0;
 266                 }
 267                 e = e->next;
 268         }
 269
 270         return -ENOENT;
 271 }
 272
 273 static void *
 274 ptlrpc_lprocfs_svc_req_history_start(struct seq_file *s, loff_t *pos)
 275 {
 276         struct ptlrpc_service       *svc = s->private;
 277         struct ptlrpc_srh_iterator  *srhi;
 278         int                          rc;
 279
 280         OBD_ALLOC(srhi, sizeof(*srhi));
 281         if (srhi == NULL)
 282                 return NULL;
 283
 284         srhi->srhi_seq = 0;
 285         srhi->srhi_req = NULL;
 286
 287         spin_lock(&svc->srv_lock);
 288         rc = ptlrpc_lprocfs_svc_req_history_seek(svc, srhi, *pos);
 289         spin_unlock(&svc->srv_lock);
 290
 291         if (rc == 0) {
 292                 *pos = srhi->srhi_seq;
 293                 return srhi;
 294         }
 295
 296         OBD_FREE(srhi, sizeof(*srhi));
 297         return NULL;
 298 }
 299
 300 static void
 301 ptlrpc_lprocfs_svc_req_history_stop(struct seq_file *s, void *iter)
 302 {
 303         struct ptlrpc_srh_iterator *srhi = iter;
 304
 305         if (srhi != NULL)
 306                 OBD_FREE(srhi, sizeof(*srhi));
 307 }
 308
 309 static void *
 310 ptlrpc_lprocfs_svc_req_history_next(struct seq_file *s,
 311                                     void *iter, loff_t *pos)
 312 {
 313         struct ptlrpc_service       *svc = s->private;
 314         struct ptlrpc_srh_iterator  *srhi = iter;
 315         int                          rc;
 316
 317         spin_lock(&svc->srv_lock);
 318         rc = ptlrpc_lprocfs_svc_req_history_seek(svc, srhi, *pos + 1);
 319         spin_unlock(&svc->srv_lock);
 320
 321         if (rc != 0) {
 322                 OBD_FREE(srhi, sizeof(*srhi));
 323                 return NULL;
 324         }
 325
 326         *pos = srhi->srhi_seq;
 327         return srhi;
 328 }
 329
 330 /* common ost/mdt srv_request_history_print_fn */
 331 void target_print_req(void *seq_file, struct ptlrpc_request *req)
 332 {
 333         /* Called holding srv_lock with irqs disabled.
 334          * Print specific req contents and a newline.
 335          * CAVEAT EMPTOR: check request message length before printing!!!
 336          * You might have received any old crap so you must be just as
 337          * careful here as the service's request parser!!! */
 338         struct seq_file *sf = seq_file;
 339
 340         switch (req->rq_phase) {
 341         case RQ_PHASE_NEW:
 342                 /* still awaiting a service thread's attention, or rejected
 343                  * because the generic request message didn't unpack */
 344                 seq_printf(sf, "<not swabbed>\n");
 345                 break;
 346         case RQ_PHASE_INTERPRET:
 347                 /* being handled, so basic msg swabbed, and opc is valid
 348                  * but racing with mds_handle() */
 349         case RQ_PHASE_COMPLETE:
 350                 /* been handled by mds_handle() reply state possibly still
 351                  * volatile */
 352                 seq_printf(sf, "opc %d\n", lustre_msg_get_opc(req->rq_reqmsg));
 353                 break;
 354         default:
 355                 DEBUG_REQ(D_ERROR, req, "bad phase %d", req->rq_phase);
 356         }
 357 }
 358 EXPORT_SYMBOL(target_print_req);
 359
 360 static int ptlrpc_lprocfs_svc_req_history_show(struct seq_file *s, void *iter)
 361 {
 362         struct ptlrpc_service      *svc = s->private;
 363         struct ptlrpc_srh_iterator *srhi = iter;
 364         struct ptlrpc_request      *req;
 365         int                         rc;
 366
 367         spin_lock(&svc->srv_lock);
 368
 369         rc = ptlrpc_lprocfs_svc_req_history_seek(svc, srhi, srhi->srhi_seq);
 370
 371         if (rc == 0) {
 372                 req = srhi->srhi_req;
 373
 374                 /* Print common req fields.
 375                  * CAVEAT EMPTOR: we're racing with the service handler
 376                  * here.  The request could contain any old crap, so you
 377                  * must be just as careful as the service's request
 378                  * parser. Currently I only print stuff here I know is OK
 379                  * to look at coz it was set up in request_in_callback()!!! */
 380                 seq_printf(s, LPD64":%s:%s:x"LPD64":%d:%s:%ld:%lds(%+lds) ",
 381                            req->rq_history_seq, libcfs_nid2str(req->rq_self),
 382                            libcfs_id2str(req->rq_peer), req->rq_xid,
 383                            req->rq_reqlen, ptlrpc_rqphase2str(req),
 384                            req->rq_arrival_time.tv_sec,
 385                            req->rq_sent - req->rq_arrival_time.tv_sec,
 386                            req->rq_sent - req->rq_deadline);
 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 /* See also lprocfs_rd_timeouts */
 424 static int ptlrpc_lprocfs_rd_timeouts(char *page, char **start, off_t off,
 425                                       int count, int *eof, void *data)
 426 {
 427         struct ptlrpc_service *svc = data;
 428         unsigned int cur, worst;
 429         time_t worstt;
 430         struct dhms ts;
 431         int rc = 0;
 432
 433         *eof = 1;
 434         cur = at_get(&svc->srv_at_estimate);
 435         worst = svc->srv_at_estimate.at_worst_ever;
 436         worstt = svc->srv_at_estimate.at_worst_time;
 437         s2dhms(&ts, cfs_time_current_sec() - worstt);
 438         if (AT_OFF)
 439                 rc += snprintf(page + rc, count - rc,
 440                               "adaptive timeouts off, using obd_timeout %u\n",
 441                               obd_timeout);
 442         rc += snprintf(page + rc, count - rc,
 443                        "%10s : cur %3u  worst %3u (at %ld, "DHMS_FMT" ago) ",
 444                        "service", cur, worst, worstt,
 445                        DHMS_VARS(&ts));
 446         rc = lprocfs_at_hist_helper(page, count, rc,
 447                                     &svc->srv_at_estimate);
 448         return rc;
 449 }
 450
 451 void ptlrpc_lprocfs_register_service(struct proc_dir_entry *entry,
 452                                      struct ptlrpc_service *svc)
 453 {
 454         struct lprocfs_vars lproc_vars[] = {
 455                 {.name       = "req_buffer_history_len",
 456                  .write_fptr = NULL,
 457                  .read_fptr  = ptlrpc_lprocfs_read_req_history_len,
 458                  .data       = svc},
 459                 {.name       = "req_buffer_history_max",
 460                  .write_fptr = ptlrpc_lprocfs_write_req_history_max,
 461                  .read_fptr  = ptlrpc_lprocfs_read_req_history_max,
 462                  .data       = svc},
 463                 {.name       = "timeouts",
 464                  .read_fptr  = ptlrpc_lprocfs_rd_timeouts,
 465                  .data       = svc},
 466                 {NULL}
 467         };
 468         static struct file_operations req_history_fops = {
 469                 .owner       = THIS_MODULE,
 470                 .open        = ptlrpc_lprocfs_svc_req_history_open,
 471                 .read        = seq_read,
 472                 .llseek      = seq_lseek,
 473                 .release     = lprocfs_seq_release,
 474         };
 475         struct proc_dir_entry *req_history;
 476
 477         ptlrpc_lprocfs_register(entry, svc->srv_name,
 478                                 "stats", &svc->srv_procroot,
 479                                 &svc->srv_stats);
 480
 481         if (svc->srv_procroot == NULL)
 482                 return;
 483
 484         lprocfs_add_vars(svc->srv_procroot, lproc_vars, NULL);
 485
 486         req_history = create_proc_entry("req_history", 0400,
 487                                         svc->srv_procroot);
 488         if (req_history != NULL) {
 489                 req_history->data = svc;
 490                 req_history->proc_fops = &req_history_fops;
 491         }
 492 }
 493
 494 void ptlrpc_lprocfs_register_obd(struct obd_device *obddev)
 495 {
 496         ptlrpc_lprocfs_register(obddev->obd_proc_entry, NULL, "stats",
 497                                 &obddev->obd_svc_procroot,
 498                                 &obddev->obd_svc_stats);
 499 }
 500 EXPORT_SYMBOL(ptlrpc_lprocfs_register_obd);
 501
 502 void ptlrpc_lprocfs_rpc_sent(struct ptlrpc_request *req)
 503 {
 504         struct lprocfs_stats *svc_stats;
 505         int opc = opcode_offset(lustre_msg_get_opc(req->rq_reqmsg));
 506
 507         svc_stats = req->rq_import->imp_obd->obd_svc_stats;
 508         if (svc_stats == NULL || opc <= 0)
 509                 return;
 510         LASSERT(opc < LUSTRE_MAX_OPCODES);
 511         /* These two use the ptlrpc_lprocfs_brw below */
 512         if (!(opc == OST_WRITE || opc == OST_READ))
 513                 lprocfs_counter_add(svc_stats, opc + PTLRPC_LAST_CNTR, 0);
 514 }
 515
 516 void ptlrpc_lprocfs_brw(struct ptlrpc_request *req, int opc, int bytes)
 517 {
 518         struct lprocfs_stats *svc_stats;
 519         svc_stats = req->rq_import->imp_obd->obd_svc_stats;
 520         if (!svc_stats)
 521                 return;
 522         lprocfs_counter_add(svc_stats, opc + PTLRPC_LAST_CNTR, bytes);
 523 }
 524 EXPORT_SYMBOL(ptlrpc_lprocfs_brw);
 525
 526 void ptlrpc_lprocfs_unregister_service(struct ptlrpc_service *svc)
 527 {
 528         if (svc->srv_procroot != NULL)
 529                 lprocfs_remove(&svc->srv_procroot);
 530         if (svc->srv_stats)
 531                 lprocfs_free_stats(&svc->srv_stats);
 532 }
 533
 534 void ptlrpc_lprocfs_unregister_obd(struct obd_device *obd)
 535 {
 536         if (obd->obd_svc_procroot)
 537                 lprocfs_remove(&obd->obd_svc_procroot);
 538         if (obd->obd_svc_stats)
 539                 lprocfs_free_stats(&obd->obd_svc_stats);
 540 }
 541 EXPORT_SYMBOL(ptlrpc_lprocfs_unregister_obd);
 542
 543
 544 int lprocfs_wr_evict_client(struct file *file, const char *buffer,
 545                             unsigned long count, void *data)
 546 {
 547         struct obd_device *obd = data;
 548         char tmpbuf[sizeof(struct obd_uuid)];
 549
 550         /* Kludge code(deadlock situation): the lprocfs lock has been held
 551          * since the client is evicted by writting client's
 552          * uuid/nid to procfs "evict_client" entry. However,
 553          * obd_export_evict_by_uuid() will call lprocfs_remove() to destroy
 554          * the proc entries under the being destroyed export{}, so I have
 555          * to drop the lock at first here.
 556          * - jay, jxiong@clusterfs.com */
 557         class_incref(obd);
 558         LPROCFS_EXIT();
 559
 560         sscanf(buffer, "%40s", tmpbuf);
 561         if (strncmp(tmpbuf, "nid:", 4) == 0)
 562                 obd_export_evict_by_nid(obd, tmpbuf + 4);
 563         else if (strncmp(tmpbuf, "uuid:", 5) == 0)
 564                 obd_export_evict_by_uuid(obd, tmpbuf + 5);
 565         else
 566                 obd_export_evict_by_uuid(obd, tmpbuf);
 567
 568         LPROCFS_ENTRY();
 569         class_decref(obd);
 570
 571         return count;
 572 }
 573 EXPORT_SYMBOL(lprocfs_wr_evict_client);
 574
 575 int lprocfs_wr_ping(struct file *file, const char *buffer,
 576                     unsigned long count, void *data)
 577 {
 578         struct obd_device *obd = data;
 579         struct ptlrpc_request *req;
 580         int rc;
 581         ENTRY;
 582
 583         LPROCFS_CLIMP_CHECK(obd);
 584         req = ptlrpc_prep_req(obd->u.cli.cl_import, LUSTRE_OBD_VERSION,
 585                               OBD_PING, 1, NULL, NULL);
 586         LPROCFS_CLIMP_EXIT(obd);
 587         if (req == NULL)
 588                 RETURN(-ENOMEM);
 589
 590         ptlrpc_req_set_repsize(req, 1, NULL);
 591         req->rq_send_state = LUSTRE_IMP_FULL;
 592         req->rq_no_resend = 1;
 593
 594         rc = ptlrpc_queue_wait(req);
 595
 596         ptlrpc_req_finished(req);
 597         if (rc >= 0)
 598                 RETURN(count);
 599         RETURN(rc);
 600 }
 601 EXPORT_SYMBOL(lprocfs_wr_ping);
 602
 603 #endif /* LPROCFS */