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[fs/lustre-release.git] / lustre / ptlrpc / lproc_ptlrpc.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2011, 2014, Intel Corporation.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  */
36 #define DEBUG_SUBSYSTEM S_CLASS
37
38
39 #include <obd_support.h>
40 #include <obd.h>
41 #include <lprocfs_status.h>
42 #include <lustre/lustre_idl.h>
43 #include <lustre_net.h>
44 #include <obd_class.h>
45 #include "ptlrpc_internal.h"
46
47
48 static struct ll_rpc_opcode {
49      __u32       opcode;
50      const char *opname;
51 } ll_rpc_opcode_table[LUSTRE_MAX_OPCODES] = {
52         { OST_REPLY,        "ost_reply" },
53         { OST_GETATTR,      "ost_getattr" },
54         { OST_SETATTR,      "ost_setattr" },
55         { OST_READ,         "ost_read" },
56         { OST_WRITE,        "ost_write" },
57         { OST_CREATE ,      "ost_create" },
58         { OST_DESTROY,      "ost_destroy" },
59         { OST_GET_INFO,     "ost_get_info" },
60         { OST_CONNECT,      "ost_connect" },
61         { OST_DISCONNECT,   "ost_disconnect" },
62         { OST_PUNCH,        "ost_punch" },
63         { OST_OPEN,         "ost_open" },
64         { OST_CLOSE,        "ost_close" },
65         { OST_STATFS,       "ost_statfs" },
66         { 14,                NULL },    /* formerly OST_SAN_READ */
67         { 15,                NULL },    /* formerly OST_SAN_WRITE */
68         { OST_SYNC,         "ost_sync" },
69         { OST_SET_INFO,     "ost_set_info" },
70         { OST_QUOTACHECK,   "ost_quotacheck" },
71         { OST_QUOTACTL,     "ost_quotactl" },
72         { OST_QUOTA_ADJUST_QUNIT, "ost_quota_adjust_qunit" },
73         { MDS_GETATTR,      "mds_getattr" },
74         { MDS_GETATTR_NAME, "mds_getattr_lock" },
75         { MDS_CLOSE,        "mds_close" },
76         { MDS_REINT,        "mds_reint" },
77         { MDS_READPAGE,     "mds_readpage" },
78         { MDS_CONNECT,      "mds_connect" },
79         { MDS_DISCONNECT,   "mds_disconnect" },
80         { MDS_GETSTATUS,    "mds_getstatus" },
81         { MDS_STATFS,       "mds_statfs" },
82         { MDS_PIN,          "mds_pin" },
83         { MDS_UNPIN,        "mds_unpin" },
84         { MDS_SYNC,         "mds_sync" },
85         { MDS_DONE_WRITING, "mds_done_writing" },
86         { MDS_SET_INFO,     "mds_set_info" },
87         { MDS_QUOTACHECK,   "mds_quotacheck" },
88         { MDS_QUOTACTL,     "mds_quotactl" },
89         { MDS_GETXATTR,     "mds_getxattr" },
90         { MDS_SETXATTR,     "mds_setxattr" },
91         { MDS_WRITEPAGE,    "mds_writepage" },
92         { MDS_IS_SUBDIR,    "mds_is_subdir" },
93         { MDS_GET_INFO,     "mds_get_info" },
94         { MDS_HSM_STATE_GET, "mds_hsm_state_get" },
95         { MDS_HSM_STATE_SET, "mds_hsm_state_set" },
96         { MDS_HSM_ACTION,   "mds_hsm_action" },
97         { MDS_HSM_PROGRESS, "mds_hsm_progress" },
98         { MDS_HSM_REQUEST,  "mds_hsm_request" },
99         { MDS_HSM_CT_REGISTER, "mds_hsm_ct_register" },
100         { MDS_HSM_CT_UNREGISTER, "mds_hsm_ct_unregister" },
101         { MDS_SWAP_LAYOUTS,     "mds_swap_layouts" },
102         { LDLM_ENQUEUE,     "ldlm_enqueue" },
103         { LDLM_CONVERT,     "ldlm_convert" },
104         { LDLM_CANCEL,      "ldlm_cancel" },
105         { LDLM_BL_CALLBACK, "ldlm_bl_callback" },
106         { LDLM_CP_CALLBACK, "ldlm_cp_callback" },
107         { LDLM_GL_CALLBACK, "ldlm_gl_callback" },
108         { LDLM_SET_INFO,    "ldlm_set_info" },
109         { MGS_CONNECT,      "mgs_connect" },
110         { MGS_DISCONNECT,   "mgs_disconnect" },
111         { MGS_EXCEPTION,    "mgs_exception" },
112         { MGS_TARGET_REG,   "mgs_target_reg" },
113         { MGS_TARGET_DEL,   "mgs_target_del" },
114         { MGS_SET_INFO,     "mgs_set_info" },
115         { MGS_CONFIG_READ,  "mgs_config_read" },
116         { OBD_PING,         "obd_ping" },
117         { OBD_LOG_CANCEL,       "llog_cancel" },
118         { OBD_QC_CALLBACK,  "obd_quota_callback" },
119         { OBD_IDX_READ,     "dt_index_read" },
120         { LLOG_ORIGIN_HANDLE_CREATE,     "llog_origin_handle_open" },
121         { LLOG_ORIGIN_HANDLE_NEXT_BLOCK, "llog_origin_handle_next_block" },
122         { LLOG_ORIGIN_HANDLE_READ_HEADER,"llog_origin_handle_read_header" },
123         { LLOG_ORIGIN_HANDLE_WRITE_REC,  "llog_origin_handle_write_rec" },
124         { LLOG_ORIGIN_HANDLE_CLOSE,      "llog_origin_handle_close" },
125         { LLOG_ORIGIN_CONNECT,           "llog_origin_connect" },
126         { LLOG_CATINFO,                  "llog_catinfo" },
127         { LLOG_ORIGIN_HANDLE_PREV_BLOCK, "llog_origin_handle_prev_block" },
128         { LLOG_ORIGIN_HANDLE_DESTROY,    "llog_origin_handle_destroy" },
129         { QUOTA_DQACQ,      "quota_acquire" },
130         { QUOTA_DQREL,      "quota_release" },
131         { SEQ_QUERY,        "seq_query" },
132         { SEC_CTX_INIT,     "sec_ctx_init" },
133         { SEC_CTX_INIT_CONT,"sec_ctx_init_cont" },
134         { SEC_CTX_FINI,     "sec_ctx_fini" },
135         { FLD_QUERY,        "fld_query" },
136         { FLD_READ,         "fld_read" },
137         { OUT_UPDATE,       "out_update" },
138         { LFSCK_NOTIFY,     "lfsck_notify" },
139         { LFSCK_QUERY,      "lfsck_query" },
140 };
141
142 static struct ll_eopcode {
143      __u32       opcode;
144      const char *opname;
145 } ll_eopcode_table[EXTRA_LAST_OPC] = {
146         { LDLM_GLIMPSE_ENQUEUE, "ldlm_glimpse_enqueue" },
147         { LDLM_PLAIN_ENQUEUE,   "ldlm_plain_enqueue" },
148         { LDLM_EXTENT_ENQUEUE,  "ldlm_extent_enqueue" },
149         { LDLM_FLOCK_ENQUEUE,   "ldlm_flock_enqueue" },
150         { LDLM_IBITS_ENQUEUE,   "ldlm_ibits_enqueue" },
151         { MDS_REINT_SETATTR,    "mds_reint_setattr" },
152         { MDS_REINT_CREATE,     "mds_reint_create" },
153         { MDS_REINT_LINK,       "mds_reint_link" },
154         { MDS_REINT_UNLINK,     "mds_reint_unlink" },
155         { MDS_REINT_RENAME,     "mds_reint_rename" },
156         { MDS_REINT_OPEN,       "mds_reint_open" },
157         { MDS_REINT_SETXATTR,   "mds_reint_setxattr" },
158         { BRW_READ_BYTES,       "read_bytes" },
159         { BRW_WRITE_BYTES,      "write_bytes" },
160 };
161
162 const char *ll_opcode2str(__u32 opcode)
163 {
164         /* When one of the assertions below fail, chances are that:
165          *     1) A new opcode was added in include/lustre/lustre_idl.h,
166          *        but is missing from the table above.
167          * or  2) The opcode space was renumbered or rearranged,
168          *        and the opcode_offset() function in
169          *        ptlrpc_internal.h needs to be modified.
170          */
171         __u32 offset = opcode_offset(opcode);
172         LASSERTF(offset < LUSTRE_MAX_OPCODES,
173                  "offset %u >= LUSTRE_MAX_OPCODES %u\n",
174                  offset, LUSTRE_MAX_OPCODES);
175         LASSERTF(ll_rpc_opcode_table[offset].opcode == opcode,
176                  "ll_rpc_opcode_table[%u].opcode %u != opcode %u\n",
177                  offset, ll_rpc_opcode_table[offset].opcode, opcode);
178         return ll_rpc_opcode_table[offset].opname;
179 }
180
181 static const char *ll_eopcode2str(__u32 opcode)
182 {
183         LASSERT(ll_eopcode_table[opcode].opcode == opcode);
184         return ll_eopcode_table[opcode].opname;
185 }
186
187 #ifdef LPROCFS
188 static void ptlrpc_lprocfs_register(struct proc_dir_entry *root, char *dir,
189                              char *name, struct proc_dir_entry **procroot_ret,
190                              struct lprocfs_stats **stats_ret)
191 {
192         struct proc_dir_entry *svc_procroot;
193         struct lprocfs_stats *svc_stats;
194         int i, rc;
195         unsigned int svc_counter_config = LPROCFS_CNTR_AVGMINMAX |
196                                           LPROCFS_CNTR_STDDEV;
197
198         LASSERT(*procroot_ret == NULL);
199         LASSERT(*stats_ret == NULL);
200
201         svc_stats = lprocfs_alloc_stats(EXTRA_MAX_OPCODES+LUSTRE_MAX_OPCODES,0);
202         if (svc_stats == NULL)
203                 return;
204
205         if (dir) {
206                 svc_procroot = lprocfs_seq_register(dir, root, NULL, NULL);
207                 if (IS_ERR(svc_procroot)) {
208                         lprocfs_free_stats(&svc_stats);
209                         return;
210                 }
211         } else {
212                 svc_procroot = root;
213         }
214
215         lprocfs_counter_init(svc_stats, PTLRPC_REQWAIT_CNTR,
216                              svc_counter_config, "req_waittime", "usec");
217         lprocfs_counter_init(svc_stats, PTLRPC_REQQDEPTH_CNTR,
218                              svc_counter_config, "req_qdepth", "reqs");
219         lprocfs_counter_init(svc_stats, PTLRPC_REQACTIVE_CNTR,
220                              svc_counter_config, "req_active", "reqs");
221         lprocfs_counter_init(svc_stats, PTLRPC_TIMEOUT,
222                              svc_counter_config, "req_timeout", "sec");
223         lprocfs_counter_init(svc_stats, PTLRPC_REQBUF_AVAIL_CNTR,
224                              svc_counter_config, "reqbuf_avail", "bufs");
225         for (i = 0; i < EXTRA_LAST_OPC; i++) {
226                 char *units;
227
228                 switch(i) {
229                 case BRW_WRITE_BYTES:
230                 case BRW_READ_BYTES:
231                         units = "bytes";
232                         break;
233                 default:
234                         units = "reqs";
235                         break;
236                 }
237                 lprocfs_counter_init(svc_stats, PTLRPC_LAST_CNTR + i,
238                                      svc_counter_config,
239                                      ll_eopcode2str(i), units);
240         }
241         for (i = 0; i < LUSTRE_MAX_OPCODES; i++) {
242                 __u32 opcode = ll_rpc_opcode_table[i].opcode;
243                 lprocfs_counter_init(svc_stats,
244                                      EXTRA_MAX_OPCODES + i, svc_counter_config,
245                                      ll_opcode2str(opcode), "usec");
246         }
247
248         rc = lprocfs_register_stats(svc_procroot, name, svc_stats);
249         if (rc < 0) {
250                 if (dir)
251                         lprocfs_remove(&svc_procroot);
252                 lprocfs_free_stats(&svc_stats);
253         } else {
254                 if (dir)
255                         *procroot_ret = svc_procroot;
256                 *stats_ret = svc_stats;
257         }
258 }
259
260 static int
261 ptlrpc_lprocfs_req_history_len_seq_show(struct seq_file *m, void *v)
262 {
263         struct ptlrpc_service *svc = m->private;
264         struct ptlrpc_service_part *svcpt;
265         int     total = 0;
266         int     i;
267
268         ptlrpc_service_for_each_part(svcpt, i, svc)
269                 total += svcpt->scp_hist_nrqbds;
270
271         return seq_printf(m, "%d\n", total);
272 }
273 LPROC_SEQ_FOPS_RO(ptlrpc_lprocfs_req_history_len);
274
275 static int
276 ptlrpc_lprocfs_req_history_max_seq_show(struct seq_file *m, void *n)
277 {
278         struct ptlrpc_service *svc = m->private;
279         struct ptlrpc_service_part *svcpt;
280         int     total = 0;
281         int     i;
282
283         ptlrpc_service_for_each_part(svcpt, i, svc)
284                 total += svc->srv_hist_nrqbds_cpt_max;
285
286         return seq_printf(m, "%d\n", total);
287 }
288
289 static ssize_t
290 ptlrpc_lprocfs_req_history_max_seq_write(struct file *file,
291                                          const char __user *buffer,
292                                          size_t count, loff_t *off)
293 {
294         struct seq_file         *m = file->private_data;
295         struct ptlrpc_service   *svc = m->private;
296         int                     bufpages;
297         int                     val;
298         int                     rc;
299
300         rc = lprocfs_write_helper(buffer, count, &val);
301         if (rc < 0)
302                 return rc;
303
304         if (val < 0)
305                 return -ERANGE;
306
307         /* This sanity check is more of an insanity check; we can still
308          * hose a kernel by allowing the request history to grow too
309          * far. */
310         bufpages = (svc->srv_buf_size + PAGE_CACHE_SIZE - 1) >>
311                                                         PAGE_CACHE_SHIFT;
312         if (val > totalram_pages/(2 * bufpages))
313                 return -ERANGE;
314
315         spin_lock(&svc->srv_lock);
316
317         if (val == 0)
318                 svc->srv_hist_nrqbds_cpt_max = 0;
319         else
320                 svc->srv_hist_nrqbds_cpt_max = max(1, (val / svc->srv_ncpts));
321
322         spin_unlock(&svc->srv_lock);
323
324         return count;
325 }
326 LPROC_SEQ_FOPS(ptlrpc_lprocfs_req_history_max);
327
328 static int
329 ptlrpc_lprocfs_threads_min_seq_show(struct seq_file *m, void *n)
330 {
331         struct ptlrpc_service *svc = m->private;
332
333         return seq_printf(m, "%d\n",
334                           svc->srv_nthrs_cpt_init * svc->srv_ncpts);
335 }
336
337 static ssize_t
338 ptlrpc_lprocfs_threads_min_seq_write(struct file *file,
339                                      const char __user *buffer,
340                                      size_t count, loff_t *off)
341 {
342         struct seq_file         *m = file->private_data;
343         struct ptlrpc_service   *svc = m->private;
344         int     val;
345         int     rc = lprocfs_write_helper(buffer, count, &val);
346
347         if (rc < 0)
348                 return rc;
349
350         if (val / svc->srv_ncpts < PTLRPC_NTHRS_INIT)
351                 return -ERANGE;
352
353         spin_lock(&svc->srv_lock);
354         if (val > svc->srv_nthrs_cpt_limit * svc->srv_ncpts) {
355                 spin_unlock(&svc->srv_lock);
356                 return -ERANGE;
357         }
358
359         svc->srv_nthrs_cpt_init = val / svc->srv_ncpts;
360
361         spin_unlock(&svc->srv_lock);
362
363         return count;
364 }
365 LPROC_SEQ_FOPS(ptlrpc_lprocfs_threads_min);
366
367 static int
368 ptlrpc_lprocfs_threads_started_seq_show(struct seq_file *m, void *n)
369 {
370         struct ptlrpc_service           *svc = m->private;
371         struct ptlrpc_service_part      *svcpt;
372         int     total = 0;
373         int     i;
374
375         ptlrpc_service_for_each_part(svcpt, i, svc)
376                 total += svcpt->scp_nthrs_running;
377
378         return seq_printf(m, "%d\n", total);
379 }
380 LPROC_SEQ_FOPS_RO(ptlrpc_lprocfs_threads_started);
381
382 static int
383 ptlrpc_lprocfs_threads_max_seq_show(struct seq_file *m, void *n)
384 {
385         struct ptlrpc_service *svc = m->private;
386
387         return seq_printf(m, "%d\n",
388                           svc->srv_nthrs_cpt_limit * svc->srv_ncpts);
389 }
390
391 static ssize_t
392 ptlrpc_lprocfs_threads_max_seq_write(struct file *file,
393                                      const char __user *buffer,
394                                      size_t count, loff_t *off)
395 {
396         struct seq_file         *m = file->private_data;
397         struct ptlrpc_service   *svc = m->private;
398         int     val;
399         int     rc = lprocfs_write_helper(buffer, count, &val);
400
401         if (rc < 0)
402                 return rc;
403
404         if (val / svc->srv_ncpts < PTLRPC_NTHRS_INIT)
405                 return -ERANGE;
406
407         spin_lock(&svc->srv_lock);
408         if (val < svc->srv_nthrs_cpt_init * svc->srv_ncpts) {
409                 spin_unlock(&svc->srv_lock);
410                 return -ERANGE;
411         }
412
413         svc->srv_nthrs_cpt_limit = val / svc->srv_ncpts;
414
415         spin_unlock(&svc->srv_lock);
416
417         return count;
418 }
419 LPROC_SEQ_FOPS(ptlrpc_lprocfs_threads_max);
420
421 /**
422  * Translates \e ptlrpc_nrs_pol_state values to human-readable strings.
423  *
424  * \param[in] state The policy state
425  */
426 static const char *nrs_state2str(enum ptlrpc_nrs_pol_state state)
427 {
428         switch (state) {
429         default:
430                 LBUG();
431         case NRS_POL_STATE_INVALID:
432                 return "invalid";
433         case NRS_POL_STATE_STOPPED:
434                 return "stopped";
435         case NRS_POL_STATE_STOPPING:
436                 return "stopping";
437         case NRS_POL_STATE_STARTING:
438                 return "starting";
439         case NRS_POL_STATE_STARTED:
440                 return "started";
441         }
442 }
443
444 /**
445  * Obtains status information for \a policy.
446  *
447  * Information is copied in \a info.
448  *
449  * \param[in] policy The policy
450  * \param[out] info  Holds returned status information
451  */
452 void nrs_policy_get_info_locked(struct ptlrpc_nrs_policy *policy,
453                                 struct ptlrpc_nrs_pol_info *info)
454 {
455         LASSERT(policy != NULL);
456         LASSERT(info != NULL);
457         assert_spin_locked(&policy->pol_nrs->nrs_lock);
458
459         memcpy(info->pi_name, policy->pol_desc->pd_name, NRS_POL_NAME_MAX);
460
461         info->pi_fallback    = !!(policy->pol_flags & PTLRPC_NRS_FL_FALLBACK);
462         info->pi_state       = policy->pol_state;
463         /**
464          * XXX: These are accessed without holding
465          * ptlrpc_service_part::scp_req_lock.
466          */
467         info->pi_req_queued  = policy->pol_req_queued;
468         info->pi_req_started = policy->pol_req_started;
469 }
470
471 /**
472  * Reads and prints policy status information for all policies of a PTLRPC
473  * service.
474  */
475 static int ptlrpc_lprocfs_nrs_seq_show(struct seq_file *m, void *n)
476 {
477         struct ptlrpc_service          *svc = m->private;
478         struct ptlrpc_service_part     *svcpt;
479         struct ptlrpc_nrs              *nrs;
480         struct ptlrpc_nrs_policy       *policy;
481         struct ptlrpc_nrs_pol_info     *infos;
482         struct ptlrpc_nrs_pol_info      tmp;
483         unsigned                        num_pols;
484         unsigned                        pol_idx = 0;
485         bool                            hp = false;
486         int                             i;
487         int                             rc = 0;
488         ENTRY;
489
490         /**
491          * Serialize NRS core lprocfs operations with policy registration/
492          * unregistration.
493          */
494         mutex_lock(&nrs_core.nrs_mutex);
495
496         /**
497          * Use the first service partition's regular NRS head in order to obtain
498          * the number of policies registered with NRS heads of this service. All
499          * service partitions will have the same number of policies.
500          */
501         nrs = nrs_svcpt2nrs(svc->srv_parts[0], false);
502
503         spin_lock(&nrs->nrs_lock);
504         num_pols = svc->srv_parts[0]->scp_nrs_reg.nrs_num_pols;
505         spin_unlock(&nrs->nrs_lock);
506
507         OBD_ALLOC(infos, num_pols * sizeof(*infos));
508         if (infos == NULL)
509                 GOTO(out, rc = -ENOMEM);
510 again:
511
512         ptlrpc_service_for_each_part(svcpt, i, svc) {
513                 nrs = nrs_svcpt2nrs(svcpt, hp);
514                 spin_lock(&nrs->nrs_lock);
515
516                 pol_idx = 0;
517
518                 list_for_each_entry(policy, &nrs->nrs_policy_list,
519                                     pol_list) {
520                         LASSERT(pol_idx < num_pols);
521
522                         nrs_policy_get_info_locked(policy, &tmp);
523                         /**
524                          * Copy values when handling the first service
525                          * partition.
526                          */
527                         if (i == 0) {
528                                 memcpy(infos[pol_idx].pi_name, tmp.pi_name,
529                                        NRS_POL_NAME_MAX);
530                                 memcpy(&infos[pol_idx].pi_state, &tmp.pi_state,
531                                        sizeof(tmp.pi_state));
532                                 infos[pol_idx].pi_fallback = tmp.pi_fallback;
533                                 /**
534                                  * For the rest of the service partitions
535                                  * sanity-check the values we get.
536                                  */
537                         } else {
538                                 LASSERT(strncmp(infos[pol_idx].pi_name,
539                                                 tmp.pi_name,
540                                                 NRS_POL_NAME_MAX) == 0);
541                                 /**
542                                  * Not asserting ptlrpc_nrs_pol_info::pi_state,
543                                  * because it may be different between
544                                  * instances of the same policy in different
545                                  * service partitions.
546                                  */
547                                 LASSERT(infos[pol_idx].pi_fallback ==
548                                         tmp.pi_fallback);
549                         }
550
551                         infos[pol_idx].pi_req_queued += tmp.pi_req_queued;
552                         infos[pol_idx].pi_req_started += tmp.pi_req_started;
553
554                         pol_idx++;
555                 }
556                 spin_unlock(&nrs->nrs_lock);
557         }
558
559         /**
560          * Policy status information output is in YAML format.
561          * For example:
562          *
563          *      regular_requests:
564          *        - name: fifo
565          *          state: started
566          *          fallback: yes
567          *          queued: 0
568          *          active: 0
569          *
570          *        - name: crrn
571          *          state: started
572          *          fallback: no
573          *          queued: 2015
574          *          active: 384
575          *
576          *      high_priority_requests:
577          *        - name: fifo
578          *          state: started
579          *          fallback: yes
580          *          queued: 0
581          *          active: 2
582          *
583          *        - name: crrn
584          *          state: stopped
585          *          fallback: no
586          *          queued: 0
587          *          active: 0
588          */
589         seq_printf(m, "%s\n", !hp ? "\nregular_requests:" :
590                    "high_priority_requests:");
591
592         for (pol_idx = 0; pol_idx < num_pols; pol_idx++) {
593                 seq_printf(m, "  - name: %s\n"
594                               "    state: %s\n"
595                               "    fallback: %s\n"
596                               "    queued: %-20d\n"
597                               "    active: %-20d\n\n",
598                               infos[pol_idx].pi_name,
599                               nrs_state2str(infos[pol_idx].pi_state),
600                               infos[pol_idx].pi_fallback ? "yes" : "no",
601                               (int)infos[pol_idx].pi_req_queued,
602                               (int)infos[pol_idx].pi_req_started);
603         }
604
605         if (!hp && nrs_svc_has_hp(svc)) {
606                 memset(infos, 0, num_pols * sizeof(*infos));
607
608                 /**
609                  * Redo the processing for the service's HP NRS heads' policies.
610                  */
611                 hp = true;
612                 goto again;
613         }
614
615 out:
616         if (infos)
617                 OBD_FREE(infos, num_pols * sizeof(*infos));
618
619         mutex_unlock(&nrs_core.nrs_mutex);
620
621         RETURN(rc);
622 }
623
624
625 #define LPROCFS_NRS_WR_MAX_ARG (1024)
626 /**
627  * The longest valid command string is the maxium policy name size, plus the
628  * length of the " reg" substring, plus the lenght of argument
629  */
630 #define LPROCFS_NRS_WR_MAX_CMD  (NRS_POL_NAME_MAX + sizeof(" reg") - 1 \
631                                  + LPROCFS_NRS_WR_MAX_ARG)
632
633 /**
634  * Starts and stops a given policy on a PTLRPC service.
635  *
636  * Commands consist of the policy name, followed by an optional [reg|hp] token;
637  * if the optional token is omitted, the operation is performed on both the
638  * regular and high-priority (if the service has one) NRS head.
639  */
640 static ssize_t
641 ptlrpc_lprocfs_nrs_seq_write(struct file *file, const char __user *buffer,
642                              size_t count, loff_t *off)
643 {
644         struct seq_file                *m = file->private_data;
645         struct ptlrpc_service          *svc = m->private;
646         enum ptlrpc_nrs_queue_type      queue = PTLRPC_NRS_QUEUE_BOTH;
647         char                           *cmd;
648         char                           *cmd_copy = NULL;
649         char                           *policy_name;
650         char                           *queue_name;
651         int                             rc = 0;
652         ENTRY;
653
654         if (count >= LPROCFS_NRS_WR_MAX_CMD)
655                 GOTO(out, rc = -EINVAL);
656
657         OBD_ALLOC(cmd, LPROCFS_NRS_WR_MAX_CMD);
658         if (cmd == NULL)
659                 GOTO(out, rc = -ENOMEM);
660         /**
661          * strsep() modifies its argument, so keep a copy
662          */
663         cmd_copy = cmd;
664
665         if (copy_from_user(cmd, buffer, count))
666                 GOTO(out, rc = -EFAULT);
667
668         cmd[count] = '\0';
669
670         policy_name = strsep(&cmd, " ");
671
672         if (strlen(policy_name) > NRS_POL_NAME_MAX - 1)
673                 GOTO(out, rc = -EINVAL);
674
675         /**
676          * No [reg|hp] token has been specified
677          */
678         if (cmd == NULL)
679                 goto default_queue;
680
681         queue_name = strsep(&cmd, " ");
682         /**
683          * The second token is either an optional [reg|hp] string,
684          * or arguments
685          */
686         if (strcmp(queue_name, "reg") == 0)
687                 queue = PTLRPC_NRS_QUEUE_REG;
688         else if (strcmp(queue_name, "hp") == 0)
689                 queue = PTLRPC_NRS_QUEUE_HP;
690         else {
691                 if (cmd != NULL)
692                         *(cmd - 1) = ' ';
693                 cmd = queue_name;
694         }
695
696 default_queue:
697
698         if (queue == PTLRPC_NRS_QUEUE_HP && !nrs_svc_has_hp(svc))
699                 GOTO(out, rc = -ENODEV);
700         else if (queue == PTLRPC_NRS_QUEUE_BOTH && !nrs_svc_has_hp(svc))
701                 queue = PTLRPC_NRS_QUEUE_REG;
702
703         /**
704          * Serialize NRS core lprocfs operations with policy registration/
705          * unregistration.
706          */
707         mutex_lock(&nrs_core.nrs_mutex);
708
709         rc = ptlrpc_nrs_policy_control(svc, queue, policy_name,
710                                        PTLRPC_NRS_CTL_START,
711                                        false, cmd);
712
713         mutex_unlock(&nrs_core.nrs_mutex);
714 out:
715         if (cmd_copy)
716                 OBD_FREE(cmd_copy, LPROCFS_NRS_WR_MAX_CMD);
717
718         RETURN(rc < 0 ? rc : count);
719 }
720 LPROC_SEQ_FOPS(ptlrpc_lprocfs_nrs);
721
722 /** @} nrs */
723
724 struct ptlrpc_srh_iterator {
725         int                     srhi_idx;
726         __u64                   srhi_seq;
727         struct ptlrpc_request   *srhi_req;
728 };
729
730 static int
731 ptlrpc_lprocfs_svc_req_history_seek(struct ptlrpc_service_part *svcpt,
732                                     struct ptlrpc_srh_iterator *srhi,
733                                     __u64 seq)
734 {
735         struct list_head        *e;
736         struct ptlrpc_request   *req;
737
738         if (srhi->srhi_req != NULL &&
739             srhi->srhi_seq > svcpt->scp_hist_seq_culled &&
740             srhi->srhi_seq <= seq) {
741                 /* If srhi_req was set previously, hasn't been culled and
742                  * we're searching for a seq on or after it (i.e. more
743                  * recent), search from it onwards.
744                  * Since the service history is LRU (i.e. culled reqs will
745                  * be near the head), we shouldn't have to do long
746                  * re-scans */
747                 LASSERTF(srhi->srhi_seq == srhi->srhi_req->rq_history_seq,
748                          "%s:%d: seek seq "LPU64", request seq "LPU64"\n",
749                          svcpt->scp_service->srv_name, svcpt->scp_cpt,
750                          srhi->srhi_seq, srhi->srhi_req->rq_history_seq);
751                 LASSERTF(!list_empty(&svcpt->scp_hist_reqs),
752                          "%s:%d: seek offset "LPU64", request seq "LPU64", "
753                          "last culled "LPU64"\n",
754                          svcpt->scp_service->srv_name, svcpt->scp_cpt,
755                          seq, srhi->srhi_seq, svcpt->scp_hist_seq_culled);
756                 e = &srhi->srhi_req->rq_history_list;
757         } else {
758                 /* search from start */
759                 e = svcpt->scp_hist_reqs.next;
760         }
761
762         while (e != &svcpt->scp_hist_reqs) {
763                 req = list_entry(e, struct ptlrpc_request, rq_history_list);
764
765                 if (req->rq_history_seq >= seq) {
766                         srhi->srhi_seq = req->rq_history_seq;
767                         srhi->srhi_req = req;
768                         return 0;
769                 }
770                 e = e->next;
771         }
772
773         return -ENOENT;
774 }
775
776 /*
777  * ptlrpc history sequence is used as "position" of seq_file, in some case,
778  * seq_read() will increase "position" to indicate reading the next
779  * element, however, low bits of history sequence are reserved for CPT id
780  * (check the details from comments before ptlrpc_req_add_history), which
781  * means seq_read() might change CPT id of history sequence and never
782  * finish reading of requests on a CPT. To make it work, we have to shift
783  * CPT id to high bits and timestamp to low bits, so seq_read() will only
784  * increase timestamp which can correctly indicate the next position.
785  */
786
787 /* convert seq_file pos to cpt */
788 #define PTLRPC_REQ_POS2CPT(svc, pos)                    \
789         ((svc)->srv_cpt_bits == 0 ? 0 :                 \
790          (__u64)(pos) >> (64 - (svc)->srv_cpt_bits))
791
792 /* make up seq_file pos from cpt */
793 #define PTLRPC_REQ_CPT2POS(svc, cpt)                    \
794         ((svc)->srv_cpt_bits == 0 ? 0 :                 \
795          (cpt) << (64 - (svc)->srv_cpt_bits))
796
797 /* convert sequence to position */
798 #define PTLRPC_REQ_SEQ2POS(svc, seq)                    \
799         ((svc)->srv_cpt_bits == 0 ? (seq) :             \
800          ((seq) >> (svc)->srv_cpt_bits) |               \
801          ((seq) << (64 - (svc)->srv_cpt_bits)))
802
803 /* convert position to sequence */
804 #define PTLRPC_REQ_POS2SEQ(svc, pos)                    \
805         ((svc)->srv_cpt_bits == 0 ? (pos) :             \
806          ((__u64)(pos) << (svc)->srv_cpt_bits) |        \
807          ((__u64)(pos) >> (64 - (svc)->srv_cpt_bits)))
808
809 static void *
810 ptlrpc_lprocfs_svc_req_history_start(struct seq_file *s, loff_t *pos)
811 {
812         struct ptlrpc_service           *svc = s->private;
813         struct ptlrpc_service_part      *svcpt;
814         struct ptlrpc_srh_iterator      *srhi;
815         unsigned int                    cpt;
816         int                             rc;
817         int                             i;
818
819         if (sizeof(loff_t) != sizeof(__u64)) { /* can't support */
820                 CWARN("Failed to read request history because size of loff_t "
821                       "%d can't match size of u64\n", (int)sizeof(loff_t));
822                 return NULL;
823         }
824
825         OBD_ALLOC(srhi, sizeof(*srhi));
826         if (srhi == NULL)
827                 return NULL;
828
829         srhi->srhi_seq = 0;
830         srhi->srhi_req = NULL;
831
832         cpt = PTLRPC_REQ_POS2CPT(svc, *pos);
833
834         ptlrpc_service_for_each_part(svcpt, i, svc) {
835                 if (i < cpt) /* skip */
836                         continue;
837                 if (i > cpt) /* make up the lowest position for this CPT */
838                         *pos = PTLRPC_REQ_CPT2POS(svc, i);
839
840                 spin_lock(&svcpt->scp_lock);
841                 rc = ptlrpc_lprocfs_svc_req_history_seek(svcpt, srhi,
842                                 PTLRPC_REQ_POS2SEQ(svc, *pos));
843                 spin_unlock(&svcpt->scp_lock);
844                 if (rc == 0) {
845                         *pos = PTLRPC_REQ_SEQ2POS(svc, srhi->srhi_seq);
846                         srhi->srhi_idx = i;
847                         return srhi;
848                 }
849         }
850
851         OBD_FREE(srhi, sizeof(*srhi));
852         return NULL;
853 }
854
855 static void
856 ptlrpc_lprocfs_svc_req_history_stop(struct seq_file *s, void *iter)
857 {
858         struct ptlrpc_srh_iterator *srhi = iter;
859
860         if (srhi != NULL)
861                 OBD_FREE(srhi, sizeof(*srhi));
862 }
863
864 static void *
865 ptlrpc_lprocfs_svc_req_history_next(struct seq_file *s,
866                                     void *iter, loff_t *pos)
867 {
868         struct ptlrpc_service           *svc = s->private;
869         struct ptlrpc_srh_iterator      *srhi = iter;
870         struct ptlrpc_service_part      *svcpt;
871         __u64                           seq;
872         int                             rc;
873         int                             i;
874
875         for (i = srhi->srhi_idx; i < svc->srv_ncpts; i++) {
876                 svcpt = svc->srv_parts[i];
877
878                 if (i > srhi->srhi_idx) { /* reset iterator for a new CPT */
879                         srhi->srhi_req = NULL;
880                         seq = srhi->srhi_seq = 0;
881                 } else { /* the next sequence */
882                         seq = srhi->srhi_seq + (1 << svc->srv_cpt_bits);
883                 }
884
885                 spin_lock(&svcpt->scp_lock);
886                 rc = ptlrpc_lprocfs_svc_req_history_seek(svcpt, srhi, seq);
887                 spin_unlock(&svcpt->scp_lock);
888                 if (rc == 0) {
889                         *pos = PTLRPC_REQ_SEQ2POS(svc, srhi->srhi_seq);
890                         srhi->srhi_idx = i;
891                         return srhi;
892                 }
893         }
894
895         OBD_FREE(srhi, sizeof(*srhi));
896         return NULL;
897 }
898
899 /* common ost/mdt so_req_printer */
900 void target_print_req(void *seq_file, struct ptlrpc_request *req)
901 {
902         /* Called holding srv_lock with irqs disabled.
903          * Print specific req contents and a newline.
904          * CAVEAT EMPTOR: check request message length before printing!!!
905          * You might have received any old crap so you must be just as
906          * careful here as the service's request parser!!! */
907         struct seq_file *sf = seq_file;
908
909         switch (req->rq_phase) {
910         case RQ_PHASE_NEW:
911                 /* still awaiting a service thread's attention, or rejected
912                  * because the generic request message didn't unpack */
913                 seq_printf(sf, "<not swabbed>\n");
914                 break;
915         case RQ_PHASE_INTERPRET:
916                 /* being handled, so basic msg swabbed, and opc is valid
917                  * but racing with mds_handle() */
918         case RQ_PHASE_COMPLETE:
919                 /* been handled by mds_handle() reply state possibly still
920                  * volatile */
921                 seq_printf(sf, "opc %d\n", lustre_msg_get_opc(req->rq_reqmsg));
922                 break;
923         default:
924                 DEBUG_REQ(D_ERROR, req, "bad phase %d", req->rq_phase);
925         }
926 }
927 EXPORT_SYMBOL(target_print_req);
928
929 static int ptlrpc_lprocfs_svc_req_history_show(struct seq_file *s, void *iter)
930 {
931         struct ptlrpc_service           *svc = s->private;
932         struct ptlrpc_srh_iterator      *srhi = iter;
933         struct ptlrpc_service_part      *svcpt;
934         struct ptlrpc_request           *req;
935         int                             rc;
936
937         LASSERT(srhi->srhi_idx < svc->srv_ncpts);
938
939         svcpt = svc->srv_parts[srhi->srhi_idx];
940
941         spin_lock(&svcpt->scp_lock);
942
943         rc = ptlrpc_lprocfs_svc_req_history_seek(svcpt, srhi, srhi->srhi_seq);
944
945         if (rc == 0) {
946                 req = srhi->srhi_req;
947
948                 /* Print common req fields.
949                  * CAVEAT EMPTOR: we're racing with the service handler
950                  * here.  The request could contain any old crap, so you
951                  * must be just as careful as the service's request
952                  * parser. Currently I only print stuff here I know is OK
953                  * to look at coz it was set up in request_in_callback()!!! */
954                 seq_printf(s, LPD64":%s:%s:x"LPU64":%d:%s:%ld:%lds(%+lds) ",
955                            req->rq_history_seq, libcfs_nid2str(req->rq_self),
956                            libcfs_id2str(req->rq_peer), req->rq_xid,
957                            req->rq_reqlen, ptlrpc_rqphase2str(req),
958                            req->rq_arrival_time.tv_sec,
959                            req->rq_sent - req->rq_arrival_time.tv_sec,
960                            req->rq_sent - req->rq_deadline);
961                 if (svc->srv_ops.so_req_printer == NULL)
962                         seq_printf(s, "\n");
963                 else
964                         svc->srv_ops.so_req_printer(s, srhi->srhi_req);
965         }
966
967         spin_unlock(&svcpt->scp_lock);
968         return rc;
969 }
970
971 static int
972 ptlrpc_lprocfs_svc_req_history_open(struct inode *inode, struct file *file)
973 {
974         static struct seq_operations sops = {
975                 .start = ptlrpc_lprocfs_svc_req_history_start,
976                 .stop  = ptlrpc_lprocfs_svc_req_history_stop,
977                 .next  = ptlrpc_lprocfs_svc_req_history_next,
978                 .show  = ptlrpc_lprocfs_svc_req_history_show,
979         };
980         struct seq_file *seqf;
981         int             rc;
982
983         LPROCFS_ENTRY_CHECK(PDE(inode));
984         rc = seq_open(file, &sops);
985         if (rc)
986                 return rc;
987
988         seqf = file->private_data;
989         seqf->private = PDE_DATA(inode);
990         return 0;
991 }
992
993 /* See also lprocfs_rd_timeouts */
994 static int ptlrpc_lprocfs_timeouts_seq_show(struct seq_file *m, void *n)
995 {
996         struct ptlrpc_service           *svc = m->private;
997         struct ptlrpc_service_part      *svcpt;
998         struct dhms                     ts;
999         time_t                          worstt;
1000         unsigned int                    cur;
1001         unsigned int                    worst;
1002         int                             i;
1003
1004         if (AT_OFF) {
1005                 seq_printf(m, "adaptive timeouts off, using obd_timeout %u\n",
1006                            obd_timeout);
1007                 return 0;
1008         }
1009
1010         ptlrpc_service_for_each_part(svcpt, i, svc) {
1011                 cur     = at_get(&svcpt->scp_at_estimate);
1012                 worst   = svcpt->scp_at_estimate.at_worst_ever;
1013                 worstt  = svcpt->scp_at_estimate.at_worst_time;
1014                 s2dhms(&ts, cfs_time_current_sec() - worstt);
1015
1016                 seq_printf(m, "%10s : cur %3u  worst %3u (at %ld, "
1017                            DHMS_FMT" ago) ", "service",
1018                            cur, worst, worstt, DHMS_VARS(&ts));
1019
1020                 lprocfs_seq_at_hist_helper(m, &svcpt->scp_at_estimate);
1021         }
1022
1023         return 0;
1024 }
1025 LPROC_SEQ_FOPS_RO(ptlrpc_lprocfs_timeouts);
1026
1027 static int ptlrpc_lprocfs_hp_ratio_seq_show(struct seq_file *m, void *v)
1028 {
1029         struct ptlrpc_service *svc = m->private;
1030         return seq_printf(m, "%d\n", svc->srv_hpreq_ratio);
1031 }
1032
1033 static ssize_t
1034 ptlrpc_lprocfs_hp_ratio_seq_write(struct file *file, const char __user *buffer,
1035                                   size_t count, loff_t *off)
1036 {
1037         struct seq_file         *m = file->private_data;
1038         struct ptlrpc_service   *svc = m->private;
1039         int     rc;
1040         int     val;
1041
1042         rc = lprocfs_write_helper(buffer, count, &val);
1043         if (rc < 0)
1044                 return rc;
1045
1046         if (val < 0)
1047                 return -ERANGE;
1048
1049         spin_lock(&svc->srv_lock);
1050         svc->srv_hpreq_ratio = val;
1051         spin_unlock(&svc->srv_lock);
1052
1053         return count;
1054 }
1055 LPROC_SEQ_FOPS(ptlrpc_lprocfs_hp_ratio);
1056
1057 void ptlrpc_lprocfs_register_service(struct proc_dir_entry *entry,
1058                                      struct ptlrpc_service *svc)
1059 {
1060         struct lprocfs_seq_vars lproc_vars[] = {
1061                 { .name = "high_priority_ratio",
1062                   .fops = &ptlrpc_lprocfs_hp_ratio_fops,
1063                   .data = svc },
1064                 { .name = "req_buffer_history_len",
1065                   .fops = &ptlrpc_lprocfs_req_history_len_fops,
1066                   .data = svc },
1067                 { .name = "req_buffer_history_max",
1068                   .fops = &ptlrpc_lprocfs_req_history_max_fops,
1069                   .data = svc },
1070                 { .name = "threads_min",
1071                   .fops = &ptlrpc_lprocfs_threads_min_fops,
1072                   .data = svc },
1073                 { .name = "threads_max",
1074                   .fops = &ptlrpc_lprocfs_threads_max_fops,
1075                   .data = svc },
1076                 { .name = "threads_started",
1077                   .fops = &ptlrpc_lprocfs_threads_started_fops,
1078                   .data = svc },
1079                 { .name = "timeouts",
1080                   .fops = &ptlrpc_lprocfs_timeouts_fops,
1081                   .data = svc },
1082                 { .name = "nrs_policies",
1083                   .fops = &ptlrpc_lprocfs_nrs_fops,
1084                   .data = svc },
1085                 { NULL }
1086         };
1087         static struct file_operations req_history_fops = {
1088                 .owner       = THIS_MODULE,
1089                 .open        = ptlrpc_lprocfs_svc_req_history_open,
1090                 .read        = seq_read,
1091                 .llseek      = seq_lseek,
1092                 .release     = lprocfs_seq_release,
1093         };
1094
1095         int rc;
1096
1097         ptlrpc_lprocfs_register(entry, svc->srv_name,
1098                                 "stats", &svc->srv_procroot,
1099                                 &svc->srv_stats);
1100         if (svc->srv_procroot == NULL)
1101                 return;
1102
1103         lprocfs_seq_add_vars(svc->srv_procroot, lproc_vars, NULL);
1104
1105         rc = lprocfs_seq_create(svc->srv_procroot, "req_history",
1106                                 0400, &req_history_fops, svc);
1107         if (rc)
1108                 CWARN("Error adding the req_history file\n");
1109 }
1110
1111 void ptlrpc_lprocfs_register_obd(struct obd_device *obddev)
1112 {
1113         ptlrpc_lprocfs_register(obddev->obd_proc_entry, NULL, "stats",
1114                                 &obddev->obd_svc_procroot,
1115                                 &obddev->obd_svc_stats);
1116 }
1117 EXPORT_SYMBOL(ptlrpc_lprocfs_register_obd);
1118
1119 void ptlrpc_lprocfs_rpc_sent(struct ptlrpc_request *req, long amount)
1120 {
1121         struct lprocfs_stats *svc_stats;
1122         __u32 op = lustre_msg_get_opc(req->rq_reqmsg);
1123         int opc = opcode_offset(op);
1124
1125         svc_stats = req->rq_import->imp_obd->obd_svc_stats;
1126         if (svc_stats == NULL || opc <= 0)
1127                 return;
1128         LASSERT(opc < LUSTRE_MAX_OPCODES);
1129         if (!(op == LDLM_ENQUEUE || op == MDS_REINT))
1130                 lprocfs_counter_add(svc_stats, opc + EXTRA_MAX_OPCODES, amount);
1131 }
1132
1133 void ptlrpc_lprocfs_brw(struct ptlrpc_request *req, int bytes)
1134 {
1135         struct lprocfs_stats *svc_stats;
1136         int idx;
1137
1138         if (!req->rq_import)
1139                 return;
1140         svc_stats = req->rq_import->imp_obd->obd_svc_stats;
1141         if (!svc_stats)
1142                 return;
1143         idx = lustre_msg_get_opc(req->rq_reqmsg);
1144         switch (idx) {
1145         case OST_READ:
1146                 idx = BRW_READ_BYTES + PTLRPC_LAST_CNTR;
1147                 break;
1148         case OST_WRITE:
1149                 idx = BRW_WRITE_BYTES + PTLRPC_LAST_CNTR;
1150                 break;
1151         default:
1152                 LASSERTF(0, "unsupported opcode %u\n", idx);
1153                 break;
1154         }
1155
1156         lprocfs_counter_add(svc_stats, idx, bytes);
1157 }
1158
1159 EXPORT_SYMBOL(ptlrpc_lprocfs_brw);
1160
1161 void ptlrpc_lprocfs_unregister_service(struct ptlrpc_service *svc)
1162 {
1163         if (svc->srv_procroot != NULL)
1164                 lprocfs_remove(&svc->srv_procroot);
1165
1166         if (svc->srv_stats)
1167                 lprocfs_free_stats(&svc->srv_stats);
1168 }
1169
1170 void ptlrpc_lprocfs_unregister_obd(struct obd_device *obd)
1171 {
1172         if (obd->obd_svc_procroot)
1173                 lprocfs_remove(&obd->obd_svc_procroot);
1174
1175         if (obd->obd_svc_stats)
1176                 lprocfs_free_stats(&obd->obd_svc_stats);
1177 }
1178 EXPORT_SYMBOL(ptlrpc_lprocfs_unregister_obd);
1179
1180 ssize_t
1181 lprocfs_ping_seq_write(struct file *file, const char *buffer,
1182                        size_t count, loff_t *off)
1183 {
1184         struct seq_file         *m = file->private_data;
1185         struct obd_device       *obd = m->private;
1186         struct ptlrpc_request   *req;
1187         int                     rc;
1188         ENTRY;
1189
1190         LPROCFS_CLIMP_CHECK(obd);
1191         req = ptlrpc_prep_ping(obd->u.cli.cl_import);
1192         LPROCFS_CLIMP_EXIT(obd);
1193         if (req == NULL)
1194                 RETURN(-ENOMEM);
1195
1196         req->rq_send_state = LUSTRE_IMP_FULL;
1197
1198         rc = ptlrpc_queue_wait(req);
1199
1200         ptlrpc_req_finished(req);
1201         if (rc >= 0)
1202                 RETURN(count);
1203         RETURN(rc);
1204 }
1205 EXPORT_SYMBOL(lprocfs_ping_seq_write);
1206
1207 /* Write the connection UUID to this file to attempt to connect to that node.
1208  * The connection UUID is a node's primary NID. For example,
1209  * "echo connection=192.168.0.1@tcp0::instance > .../import".
1210  */
1211 ssize_t
1212 lprocfs_import_seq_write(struct file *file, const char __user *buffer,
1213                          size_t count, loff_t *off)
1214 {
1215         struct seq_file   *m    = file->private_data;
1216         struct obd_device *obd  = m->private;
1217         struct obd_import *imp  = obd->u.cli.cl_import;
1218         char *kbuf = NULL;
1219         char *uuid;
1220         char *ptr;
1221         int do_reconn = 1;
1222         const char prefix[] = "connection=";
1223         const int prefix_len = sizeof(prefix) - 1;
1224
1225         if (count > PAGE_CACHE_SIZE - 1 || count <= prefix_len)
1226                 return -EINVAL;
1227
1228         OBD_ALLOC(kbuf, count + 1);
1229         if (kbuf == NULL)
1230                 return -ENOMEM;
1231
1232         if (copy_from_user(kbuf, buffer, count))
1233                 GOTO(out, count = -EFAULT);
1234
1235         kbuf[count] = 0;
1236
1237         /* only support connection=uuid::instance now */
1238         if (strncmp(prefix, kbuf, prefix_len) != 0)
1239                 GOTO(out, count = -EINVAL);
1240
1241         uuid = kbuf + prefix_len;
1242         ptr = strstr(uuid, "::");
1243         if (ptr) {
1244                 __u32 inst;
1245                 char *endptr;
1246
1247                 *ptr = 0;
1248                 do_reconn = 0;
1249                 ptr += 2; /* Skip :: */
1250                 inst = simple_strtol(ptr, &endptr, 10);
1251                 if (*endptr) {
1252                         CERROR("config: wrong instance # %s\n", ptr);
1253                 } else if (inst != imp->imp_connect_data.ocd_instance) {
1254                         CDEBUG(D_INFO, "IR: %s is connecting to an obsoleted "
1255                                "target(%u/%u), reconnecting...\n",
1256                                imp->imp_obd->obd_name,
1257                                imp->imp_connect_data.ocd_instance, inst);
1258                         do_reconn = 1;
1259                 } else {
1260                         CDEBUG(D_INFO, "IR: %s has already been connecting to "
1261                                "new target(%u)\n",
1262                                imp->imp_obd->obd_name, inst);
1263                 }
1264         }
1265
1266         if (do_reconn)
1267                 ptlrpc_recover_import(imp, uuid, 1);
1268
1269 out:
1270         OBD_FREE(kbuf, count + 1);
1271         return count;
1272 }
1273 EXPORT_SYMBOL(lprocfs_import_seq_write);
1274
1275 int lprocfs_pinger_recov_seq_show(struct seq_file *m, void *n)
1276 {
1277         struct obd_device *obd = m->private;
1278         struct obd_import *imp = obd->u.cli.cl_import;
1279         int rc;
1280
1281         LPROCFS_CLIMP_CHECK(obd);
1282         rc = seq_printf(m, "%d\n", !imp->imp_no_pinger_recover);
1283         LPROCFS_CLIMP_EXIT(obd);
1284         return rc;
1285 }
1286 EXPORT_SYMBOL(lprocfs_pinger_recov_seq_show);
1287
1288 ssize_t
1289 lprocfs_pinger_recov_seq_write(struct file *file, const char *buffer,
1290                                size_t count, loff_t *off)
1291 {
1292         struct seq_file   *m    = file->private_data;
1293         struct obd_device *obd  = m->private;
1294         struct client_obd *cli  = &obd->u.cli;
1295         struct obd_import *imp  = cli->cl_import;
1296         int rc, val;
1297
1298         rc = lprocfs_write_helper(buffer, count, &val);
1299         if (rc < 0)
1300                 return rc;
1301
1302         if (val != 0 && val != 1)
1303                 return -ERANGE;
1304
1305         LPROCFS_CLIMP_CHECK(obd);
1306         spin_lock(&imp->imp_lock);
1307         imp->imp_no_pinger_recover = !val;
1308         spin_unlock(&imp->imp_lock);
1309         LPROCFS_CLIMP_EXIT(obd);
1310         return count;
1311 }
1312 EXPORT_SYMBOL(lprocfs_pinger_recov_seq_write);
1313
1314 #endif /* LPROCFS */