lustre/obdclass/lprocfs_status.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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/obdclass/lprocfs_status.c
  33  *
  34  * Author: Hariharan Thantry <thantry@users.sourceforge.net>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_CLASS
  38
  39 #include <obd_class.h>
  40 #include <lprocfs_status.h>
  41
  42 #ifdef CONFIG_PROC_FS
  43
  44 static int lprocfs_no_percpu_stats = 0;
  45 module_param(lprocfs_no_percpu_stats, int, 0644);
  46 MODULE_PARM_DESC(lprocfs_no_percpu_stats, "Do not alloc percpu data for lprocfs stats");
  47
  48 #define MAX_STRING_SIZE 128
  49
  50 int lprocfs_single_release(struct inode *inode, struct file *file)
  51 {
  52         return single_release(inode, file);
  53 }
  54 EXPORT_SYMBOL(lprocfs_single_release);
  55
  56 int lprocfs_seq_release(struct inode *inode, struct file *file)
  57 {
  58         return seq_release(inode, file);
  59 }
  60 EXPORT_SYMBOL(lprocfs_seq_release);
  61
  62 struct dentry *ldebugfs_add_simple(struct dentry *root,
  63                                    char *name, void *data,
  64                                    const struct file_operations *fops)
  65 {
  66         struct dentry *entry;
  67         umode_t mode = 0;
  68
  69         if (!root || !name || !fops)
  70                 return ERR_PTR(-EINVAL);
  71
  72         if (fops->read)
  73                 mode = 0444;
  74         if (fops->write)
  75                 mode |= 0200;
  76         entry = debugfs_create_file(name, mode, root, data, fops);
  77         if (IS_ERR_OR_NULL(entry)) {
  78                 CERROR("LprocFS: No memory to create <debugfs> entry %s", name);
  79                 return entry ?: ERR_PTR(-ENOMEM);
  80         }
  81         return entry;
  82 }
  83 EXPORT_SYMBOL(ldebugfs_add_simple);
  84
  85 struct proc_dir_entry *
  86 lprocfs_add_simple(struct proc_dir_entry *root, char *name,
  87                    void *data, const struct file_operations *fops)
  88 {
  89         struct proc_dir_entry *proc;
  90         mode_t mode = 0;
  91
  92         if (!root || !name || !fops)
  93                 return ERR_PTR(-EINVAL);
  94
  95         if (fops->read)
  96                 mode = 0444;
  97         if (fops->write)
  98                 mode |= 0200;
  99         proc = proc_create_data(name, mode, root, fops, data);
 100         if (!proc) {
 101                 CERROR("LprocFS: No memory to create /proc entry %s\n",
 102                        name);
 103                 return ERR_PTR(-ENOMEM);
 104         }
 105         return proc;
 106 }
 107 EXPORT_SYMBOL(lprocfs_add_simple);
 108
 109 struct proc_dir_entry *lprocfs_add_symlink(const char *name,
 110                                            struct proc_dir_entry *parent,
 111                                            const char *format, ...)
 112 {
 113         struct proc_dir_entry *entry;
 114         char *dest;
 115         va_list ap;
 116
 117         if (!parent || !format)
 118                 return NULL;
 119
 120         OBD_ALLOC_WAIT(dest, MAX_STRING_SIZE + 1);
 121         if (!dest)
 122                 return NULL;
 123
 124         va_start(ap, format);
 125         vsnprintf(dest, MAX_STRING_SIZE, format, ap);
 126         va_end(ap);
 127
 128         entry = proc_symlink(name, parent, dest);
 129         if (!entry)
 130                 CERROR("LprocFS: Could not create symbolic link from "
 131                        "%s to %s\n", name, dest);
 132
 133         OBD_FREE(dest, MAX_STRING_SIZE + 1);
 134         return entry;
 135 }
 136 EXPORT_SYMBOL(lprocfs_add_symlink);
 137
 138 static const struct file_operations lprocfs_generic_fops = { };
 139
 140 int ldebugfs_add_vars(struct dentry *parent, struct lprocfs_vars *list,
 141                       void *data)
 142 {
 143         if (IS_ERR_OR_NULL(parent) || IS_ERR_OR_NULL(list))
 144                 return -EINVAL;
 145
 146         while (list->name) {
 147                 struct dentry *entry;
 148                 umode_t mode = 0;
 149
 150                 if (list->proc_mode != 0000) {
 151                         mode = list->proc_mode;
 152                 } else if (list->fops) {
 153                         if (list->fops->read)
 154                                 mode = 0444;
 155                         if (list->fops->write)
 156                                 mode |= 0200;
 157                 }
 158                 entry = debugfs_create_file(list->name, mode, parent,
 159                                             list->data ? : data,
 160                                             list->fops ? : &lprocfs_generic_fops);
 161                 if (IS_ERR_OR_NULL(entry))
 162                         return entry ? PTR_ERR(entry) : -ENOMEM;
 163                 list++;
 164         }
 165         return 0;
 166 }
 167 EXPORT_SYMBOL_GPL(ldebugfs_add_vars);
 168
 169 /**
 170  * Add /proc entries.
 171  *
 172  * \param root [in]  The parent proc entry on which new entry will be added.
 173  * \param list [in]  Array of proc entries to be added.
 174  * \param data [in]  The argument to be passed when entries read/write routines
 175  *                   are called through /proc file.
 176  *
 177  * \retval 0   on success
 178  *         < 0 on error
 179  */
 180 int
 181 lprocfs_add_vars(struct proc_dir_entry *root, struct lprocfs_vars *list,
 182                  void *data)
 183 {
 184         if (!root || !list)
 185                 return -EINVAL;
 186
 187         while (list->name) {
 188                 struct proc_dir_entry *proc;
 189                 mode_t mode = 0;
 190
 191                 if (list->proc_mode != 0000) {
 192                         mode = list->proc_mode;
 193                 } else if (list->fops) {
 194                         if (list->fops->read)
 195                                 mode = 0444;
 196                         if (list->fops->write)
 197                                 mode |= 0200;
 198                 }
 199                 proc = proc_create_data(list->name, mode, root,
 200                                         list->fops ?: &lprocfs_generic_fops,
 201                                         list->data ?: data);
 202                 if (!proc)
 203                         return -ENOMEM;
 204                 list++;
 205         }
 206         return 0;
 207 }
 208 EXPORT_SYMBOL(lprocfs_add_vars);
 209
 210 void ldebugfs_remove(struct dentry **entryp)
 211 {
 212         debugfs_remove_recursive(*entryp);
 213         *entryp = NULL;
 214 }
 215 EXPORT_SYMBOL_GPL(ldebugfs_remove);
 216
 217 #ifndef HAVE_REMOVE_PROC_SUBTREE
 218 /* for b=10866, global variable */
 219 DECLARE_RWSEM(_lprocfs_lock);
 220 EXPORT_SYMBOL(_lprocfs_lock);
 221
 222 static void lprocfs_remove_nolock(struct proc_dir_entry **proot)
 223 {
 224         struct proc_dir_entry *root = *proot;
 225         struct proc_dir_entry *temp = root;
 226         struct proc_dir_entry *rm_entry;
 227         struct proc_dir_entry *parent;
 228
 229         *proot = NULL;
 230         if (!root || IS_ERR(root))
 231                 return;
 232
 233         parent = root->parent;
 234         LASSERT(parent != NULL);
 235
 236         while (1) {
 237                 while (temp->subdir)
 238                         temp = temp->subdir;
 239
 240                 rm_entry = temp;
 241                 temp = temp->parent;
 242
 243                 /*
 244                  * Memory corruption once caused this to fail, and
 245                  * without this LASSERT we would loop here forever.
 246                  */
 247                 LASSERTF(strlen(rm_entry->name) == rm_entry->namelen,
 248                          "0x%p  %s/%s len %d\n", rm_entry, temp->name,
 249                          rm_entry->name, (int)strlen(rm_entry->name));
 250
 251                 remove_proc_entry(rm_entry->name, temp);
 252                 if (temp == parent)
 253                         break;
 254         }
 255 }
 256
 257 int remove_proc_subtree(const char *name, struct proc_dir_entry *parent)
 258 {
 259         struct proc_dir_entry *t = NULL;
 260         struct proc_dir_entry **p;
 261         int len, busy = 0;
 262
 263         LASSERT(parent != NULL);
 264         len = strlen(name);
 265
 266         down_write(&_lprocfs_lock);
 267         /* lookup target name */
 268         for (p = &parent->subdir; *p; p = &(*p)->next) {
 269                 if ((*p)->namelen != len)
 270                         continue;
 271                 if (memcmp(name, (*p)->name, len))
 272                         continue;
 273                 t = *p;
 274                 break;
 275         }
 276
 277         if (t) {
 278                 /* verify it's empty: do not count "num_refs" */
 279                 for (p = &t->subdir; *p; p = &(*p)->next) {
 280                         if ((*p)->namelen != strlen("num_refs")) {
 281                                 busy = 1;
 282                                 break;
 283                         }
 284                         if (memcmp("num_refs", (*p)->name,
 285                                    strlen("num_refs"))) {
 286                                 busy = 1;
 287                                 break;
 288                         }
 289                 }
 290         }
 291
 292         if (busy == 0)
 293                 lprocfs_remove_nolock(&t);
 294
 295         up_write(&_lprocfs_lock);
 296         return 0;
 297 }
 298 #endif /* !HAVE_REMOVE_PROC_SUBTREE */
 299
 300 #ifndef HAVE_PROC_REMOVE
 301 void proc_remove(struct proc_dir_entry *de)
 302 {
 303 #ifndef HAVE_REMOVE_PROC_SUBTREE
 304         down_write(&_lprocfs_lock); /* search vs remove race */
 305         lprocfs_remove_nolock(&de);
 306         up_write(&_lprocfs_lock);
 307 #else
 308         if (de)
 309                 remove_proc_subtree(de->name, de->parent);
 310 #endif
 311 }
 312 #endif
 313
 314 void lprocfs_remove(struct proc_dir_entry **rooth)
 315 {
 316         proc_remove(*rooth);
 317         *rooth = NULL;
 318 }
 319 EXPORT_SYMBOL(lprocfs_remove);
 320
 321 void lprocfs_remove_proc_entry(const char *name, struct proc_dir_entry *parent)
 322 {
 323         LASSERT(parent != NULL);
 324         remove_proc_entry(name, parent);
 325 }
 326 EXPORT_SYMBOL(lprocfs_remove_proc_entry);
 327
 328 struct dentry *ldebugfs_register(const char *name, struct dentry *parent,
 329                                  struct lprocfs_vars *list, void *data)
 330 {
 331         struct dentry *entry;
 332
 333         entry = debugfs_create_dir(name, parent);
 334         if (IS_ERR_OR_NULL(entry)) {
 335                 entry = entry ?: ERR_PTR(-ENOMEM);
 336                 goto out;
 337         }
 338
 339         if (!IS_ERR_OR_NULL(list)) {
 340                 int rc;
 341
 342                 rc = ldebugfs_add_vars(entry, list, data);
 343                 if (rc) {
 344                         debugfs_remove(entry);
 345                         entry = ERR_PTR(rc);
 346                 }
 347         }
 348 out:
 349         return entry;
 350 }
 351 EXPORT_SYMBOL_GPL(ldebugfs_register);
 352
 353 struct proc_dir_entry *
 354 lprocfs_register(const char *name, struct proc_dir_entry *parent,
 355                  struct lprocfs_vars *list, void *data)
 356 {
 357         struct proc_dir_entry *newchild;
 358
 359         newchild = proc_mkdir(name, parent);
 360         if (!newchild)
 361                 return ERR_PTR(-ENOMEM);
 362
 363         if (list) {
 364                 int rc = lprocfs_add_vars(newchild, list, data);
 365                 if (rc) {
 366                         lprocfs_remove(&newchild);
 367                         return ERR_PTR(rc);
 368                 }
 369         }
 370         return newchild;
 371 }
 372 EXPORT_SYMBOL(lprocfs_register);
 373
 374 /* Generic callbacks */
 375 int lprocfs_uuid_seq_show(struct seq_file *m, void *data)
 376 {
 377         struct obd_device *obd = data;
 378
 379         LASSERT(obd != NULL);
 380         seq_printf(m, "%s\n", obd->obd_uuid.uuid);
 381         return 0;
 382 }
 383 EXPORT_SYMBOL(lprocfs_uuid_seq_show);
 384
 385 static ssize_t uuid_show(struct kobject *kobj, struct attribute *attr,
 386                          char *buf)
 387 {
 388         struct obd_device *obd = container_of(kobj, struct obd_device,
 389                                               obd_kset.kobj);
 390
 391         return sprintf(buf, "%s\n", obd->obd_uuid.uuid);
 392 }
 393 LUSTRE_RO_ATTR(uuid);
 394
 395 static ssize_t blocksize_show(struct kobject *kobj, struct attribute *attr,
 396                               char *buf)
 397 {
 398         struct obd_device *obd = container_of(kobj, struct obd_device,
 399                                               obd_kset.kobj);
 400         struct obd_statfs osfs;
 401         int rc;
 402
 403         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 404                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 405                         OBD_STATFS_NODELAY);
 406         if (!rc)
 407                 return sprintf(buf, "%u\n", osfs.os_bsize);
 408
 409         return rc;
 410 }
 411 LUSTRE_RO_ATTR(blocksize);
 412
 413 static ssize_t kbytestotal_show(struct kobject *kobj, struct attribute *attr,
 414                                 char *buf)
 415 {
 416         struct obd_device *obd = container_of(kobj, struct obd_device,
 417                                               obd_kset.kobj);
 418         struct obd_statfs osfs;
 419         int rc;
 420
 421         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 422                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 423                         OBD_STATFS_NODELAY);
 424         if (!rc) {
 425                 u32 blk_size = osfs.os_bsize >> 10;
 426                 u64 result = osfs.os_blocks;
 427
 428                 while (blk_size >>= 1)
 429                         result <<= 1;
 430
 431                 return sprintf(buf, "%llu\n", result);
 432         }
 433
 434         return rc;
 435 }
 436 LUSTRE_RO_ATTR(kbytestotal);
 437
 438 static ssize_t kbytesfree_show(struct kobject *kobj, struct attribute *attr,
 439                                char *buf)
 440 {
 441         struct obd_device *obd = container_of(kobj, struct obd_device,
 442                                               obd_kset.kobj);
 443         struct obd_statfs osfs;
 444         int rc;
 445
 446         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 447                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 448                         OBD_STATFS_NODELAY);
 449         if (!rc) {
 450                 u32 blk_size = osfs.os_bsize >> 10;
 451                 u64 result = osfs.os_bfree;
 452
 453                 while (blk_size >>= 1)
 454                         result <<= 1;
 455
 456                 return sprintf(buf, "%llu\n", result);
 457         }
 458
 459         return rc;
 460 }
 461 LUSTRE_RO_ATTR(kbytesfree);
 462
 463 static ssize_t kbytesavail_show(struct kobject *kobj, struct attribute *attr,
 464                                 char *buf)
 465 {
 466         struct obd_device *obd = container_of(kobj, struct obd_device,
 467                                               obd_kset.kobj);
 468         struct obd_statfs osfs;
 469         int rc;
 470
 471         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 472                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 473                         OBD_STATFS_NODELAY);
 474         if (!rc) {
 475                 u32 blk_size = osfs.os_bsize >> 10;
 476                 u64 result = osfs.os_bavail;
 477
 478                 while (blk_size >>= 1)
 479                         result <<= 1;
 480
 481                 return sprintf(buf, "%llu\n", result);
 482         }
 483
 484         return rc;
 485 }
 486 LUSTRE_RO_ATTR(kbytesavail);
 487
 488 static ssize_t filestotal_show(struct kobject *kobj, struct attribute *attr,
 489                                char *buf)
 490 {
 491         struct obd_device *obd = container_of(kobj, struct obd_device,
 492                                               obd_kset.kobj);
 493         struct obd_statfs osfs;
 494         int rc;
 495
 496         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 497                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 498                         OBD_STATFS_NODELAY);
 499         if (!rc)
 500                 return sprintf(buf, "%llu\n", osfs.os_files);
 501
 502         return rc;
 503 }
 504 LUSTRE_RO_ATTR(filestotal);
 505
 506 static ssize_t filesfree_show(struct kobject *kobj, struct attribute *attr,
 507                               char *buf)
 508 {
 509         struct obd_device *obd = container_of(kobj, struct obd_device,
 510                                               obd_kset.kobj);
 511         struct obd_statfs osfs;
 512         int rc;
 513
 514         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 515                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 516                         OBD_STATFS_NODELAY);
 517         if (!rc)
 518                 return sprintf(buf, "%llu\n", osfs.os_ffree);
 519
 520         return rc;
 521 }
 522 LUSTRE_RO_ATTR(filesfree);
 523
 524 ssize_t conn_uuid_show(struct kobject *kobj, struct attribute *attr, char *buf)
 525 {
 526         struct obd_device *obd = container_of(kobj, struct obd_device,
 527                                               obd_kset.kobj);
 528         struct ptlrpc_connection *conn;
 529         ssize_t count;
 530
 531         LPROCFS_CLIMP_CHECK(obd);
 532         conn = obd->u.cli.cl_import->imp_connection;
 533         if (conn && obd->u.cli.cl_import)
 534                 count = sprintf(buf, "%s\n", conn->c_remote_uuid.uuid);
 535         else
 536                 count = sprintf(buf, "%s\n", "<none>");
 537
 538         LPROCFS_CLIMP_EXIT(obd);
 539         return count;
 540 }
 541 EXPORT_SYMBOL(conn_uuid_show);
 542
 543 int lprocfs_server_uuid_seq_show(struct seq_file *m, void *data)
 544 {
 545         struct obd_device *obd = data;
 546         struct obd_import *imp;
 547         char *imp_state_name = NULL;
 548         int rc = 0;
 549
 550         LASSERT(obd != NULL);
 551         LPROCFS_CLIMP_CHECK(obd);
 552         imp = obd->u.cli.cl_import;
 553         imp_state_name = ptlrpc_import_state_name(imp->imp_state);
 554         seq_printf(m, "%s\t%s%s\n", obd2cli_tgt(obd), imp_state_name,
 555                    imp->imp_deactive ? "\tDEACTIVATED" : "");
 556
 557         LPROCFS_CLIMP_EXIT(obd);
 558         return rc;
 559 }
 560 EXPORT_SYMBOL(lprocfs_server_uuid_seq_show);
 561
 562 /** add up per-cpu counters */
 563
 564 /**
 565  * Lock statistics structure for access, possibly only on this CPU.
 566  *
 567  * The statistics struct may be allocated with per-CPU structures for
 568  * efficient concurrent update (usually only on server-wide stats), or
 569  * as a single global struct (e.g. for per-client or per-job statistics),
 570  * so the required locking depends on the type of structure allocated.
 571  *
 572  * For per-CPU statistics, pin the thread to the current cpuid so that
 573  * will only access the statistics for that CPU.  If the stats structure
 574  * for the current CPU has not been allocated (or previously freed),
 575  * allocate it now.  The per-CPU statistics do not need locking since
 576  * the thread is pinned to the CPU during update.
 577  *
 578  * For global statistics, lock the stats structure to prevent concurrent update.
 579  *
 580  * \param[in] stats     statistics structure to lock
 581  * \param[in] opc       type of operation:
 582  *                      LPROCFS_GET_SMP_ID: "lock" and return current CPU index
 583  *                              for incrementing statistics for that CPU
 584  *                      LPROCFS_GET_NUM_CPU: "lock" and return number of used
 585  *                              CPU indices to iterate over all indices
 586  * \param[out] flags    CPU interrupt saved state for IRQ-safe locking
 587  *
 588  * \retval cpuid of current thread or number of allocated structs
 589  * \retval negative on error (only for opc LPROCFS_GET_SMP_ID + per-CPU stats)
 590  */
 591 int lprocfs_stats_lock(struct lprocfs_stats *stats,
 592                        enum lprocfs_stats_lock_ops opc,
 593                        unsigned long *flags)
 594 {
 595         if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) {
 596                 if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
 597                         spin_lock_irqsave(&stats->ls_lock, *flags);
 598                 else
 599                         spin_lock(&stats->ls_lock);
 600                 return opc == LPROCFS_GET_NUM_CPU ? 1 : 0;
 601         }
 602
 603         switch (opc) {
 604         case LPROCFS_GET_SMP_ID: {
 605                 unsigned int cpuid = get_cpu();
 606
 607                 if (unlikely(!stats->ls_percpu[cpuid])) {
 608                         int rc = lprocfs_stats_alloc_one(stats, cpuid);
 609
 610                         if (rc < 0) {
 611                                 put_cpu();
 612                                 return rc;
 613                         }
 614                 }
 615                 return cpuid;
 616         }
 617         case LPROCFS_GET_NUM_CPU:
 618                 return stats->ls_biggest_alloc_num;
 619         default:
 620                 LBUG();
 621         }
 622 }
 623
 624 /**
 625  * Unlock statistics structure after access.
 626  *
 627  * Unlock the lock acquired via lprocfs_stats_lock() for global statistics,
 628  * or unpin this thread from the current cpuid for per-CPU statistics.
 629  *
 630  * This function must be called using the same arguments as used when calling
 631  * lprocfs_stats_lock() so that the correct operation can be performed.
 632  *
 633  * \param[in] stats     statistics structure to unlock
 634  * \param[in] opc       type of operation (current cpuid or number of structs)
 635  * \param[in] flags     CPU interrupt saved state for IRQ-safe locking
 636  */
 637 void lprocfs_stats_unlock(struct lprocfs_stats *stats,
 638                           enum lprocfs_stats_lock_ops opc,
 639                           unsigned long *flags)
 640 {
 641         if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) {
 642                 if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
 643                         spin_unlock_irqrestore(&stats->ls_lock, *flags);
 644                 else
 645                         spin_unlock(&stats->ls_lock);
 646         } else if (opc == LPROCFS_GET_SMP_ID) {
 647                 put_cpu();
 648         }
 649 }
 650
 651 /** add up per-cpu counters */
 652 void lprocfs_stats_collect(struct lprocfs_stats *stats, int idx,
 653                            struct lprocfs_counter *cnt)
 654 {
 655         unsigned int num_entry;
 656         struct lprocfs_counter *percpu_cntr;
 657         int i;
 658         unsigned long flags = 0;
 659
 660         memset(cnt, 0, sizeof(*cnt));
 661
 662         if (!stats) {
 663                 /* set count to 1 to avoid divide-by-zero errs in callers */
 664                 cnt->lc_count = 1;
 665                 return;
 666         }
 667
 668         cnt->lc_min = LC_MIN_INIT;
 669
 670         num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
 671
 672         for (i = 0; i < num_entry; i++) {
 673                 if (!stats->ls_percpu[i])
 674                         continue;
 675                 percpu_cntr = lprocfs_stats_counter_get(stats, i, idx);
 676
 677                 cnt->lc_count += percpu_cntr->lc_count;
 678                 cnt->lc_sum += percpu_cntr->lc_sum;
 679                 if (percpu_cntr->lc_min < cnt->lc_min)
 680                         cnt->lc_min = percpu_cntr->lc_min;
 681                 if (percpu_cntr->lc_max > cnt->lc_max)
 682                         cnt->lc_max = percpu_cntr->lc_max;
 683                 cnt->lc_sumsquare += percpu_cntr->lc_sumsquare;
 684         }
 685
 686         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
 687 }
 688
 689 static void obd_import_flags2str(struct obd_import *imp, struct seq_file *m)
 690 {
 691         bool first = true;
 692
 693         if (imp->imp_obd->obd_no_recov) {
 694                 seq_printf(m, "no_recov");
 695                 first = false;
 696         }
 697
 698         flag2str(imp, invalid);
 699         flag2str(imp, deactive);
 700         flag2str(imp, replayable);
 701         flag2str(imp, delayed_recovery);
 702         flag2str(imp, vbr_failed);
 703         flag2str(imp, pingable);
 704         flag2str(imp, resend_replay);
 705         flag2str(imp, no_pinger_recover);
 706         flag2str(imp, connect_tried);
 707 }
 708
 709 static const char *obd_connect_names[] = {
 710         /* flags names  */
 711         "read_only",
 712         "lov_index",
 713         "connect_from_mds",
 714         "write_grant",
 715         "server_lock",
 716         "version",
 717         "request_portal",
 718         "acl",
 719         "xattr",
 720         "create_on_write",
 721         "truncate_lock",
 722         "initial_transno",
 723         "inode_bit_locks",
 724         "barrier",
 725         "getattr_by_fid",
 726         "no_oh_for_devices",
 727         "remote_client",
 728         "remote_client_by_force",
 729         "max_byte_per_rpc",
 730         "64bit_qdata",
 731         "mds_capability",
 732         "oss_capability",
 733         "early_lock_cancel",
 734         "som",
 735         "adaptive_timeouts",
 736         "lru_resize",
 737         "mds_mds_connection",
 738         "real_conn",
 739         "change_qunit_size",
 740         "alt_checksum_algorithm",
 741         "fid_is_enabled",
 742         "version_recovery",
 743         "pools",
 744         "grant_shrink",
 745         "skip_orphan",
 746         "large_ea",
 747         "full20",
 748         "layout_lock",
 749         "64bithash",
 750         "object_max_bytes",
 751         "imp_recov",
 752         "jobstats",
 753         "umask",
 754         "einprogress",
 755         "grant_param",
 756         "flock_owner",
 757         "lvb_type",
 758         "nanoseconds_times",
 759         "lightweight_conn",
 760         "short_io",
 761         "pingless",
 762         "flock_deadlock",
 763         "disp_stripe",
 764         "open_by_fid",
 765         "lfsck",
 766         "unknown",
 767         "unlink_close",
 768         "multi_mod_rpcs",
 769         "dir_stripe",
 770         "subtree",
 771         "lockahead",
 772         "bulk_mbits",
 773         "compact_obdo",
 774         "second_flags",
 775         /* flags2 names */
 776         "file_secctx",  /* 0x01 */
 777         "lockaheadv2",  /* 0x02 */
 778         "dir_migrate",  /* 0x04 */
 779         "unknown",      /* 0x08 */
 780         "unknown",      /* 0x10 */
 781         "flr",          /* 0x20 */
 782         "wbc",          /* 0x40 */
 783         "lock_convert",  /* 0x80 */
 784         "archive_id_array",     /* 0x100 */
 785         "unknown",              /* 0x200 */
 786         "selinux_policy",       /* 0x400 */
 787         "lsom",                 /* 0x800 */
 788         "pcc",                  /* 0x1000 */
 789         NULL
 790 };
 791
 792 void obd_connect_seq_flags2str(struct seq_file *m, __u64 flags, __u64 flags2,
 793                                const char *sep)
 794 {
 795         bool first = true;
 796         __u64 mask;
 797         int i;
 798
 799         for (i = 0, mask = 1; i < 64; i++, mask <<= 1) {
 800                 if (flags & mask) {
 801                         seq_printf(m, "%s%s",
 802                                    first ? "" : sep, obd_connect_names[i]);
 803                         first = false;
 804                 }
 805         }
 806
 807         if (flags & ~(mask - 1)) {
 808                 seq_printf(m, "%sunknown_%#llx",
 809                            first ? "" : sep, flags & ~(mask - 1));
 810                 first = false;
 811         }
 812
 813         if (!(flags & OBD_CONNECT_FLAGS2) || flags2 == 0)
 814                 return;
 815
 816         for (i = 64, mask = 1; obd_connect_names[i] != NULL; i++, mask <<= 1) {
 817                 if (flags2 & mask) {
 818                         seq_printf(m, "%s%s",
 819                                    first ? "" : sep, obd_connect_names[i]);
 820                         first = false;
 821                 }
 822         }
 823
 824         if (flags2 & ~(mask - 1)) {
 825                 seq_printf(m, "%sunknown2_%#llx",
 826                            first ? "" : sep, flags2 & ~(mask - 1));
 827                 first = false;
 828         }
 829 }
 830 EXPORT_SYMBOL(obd_connect_seq_flags2str);
 831
 832 int obd_connect_flags2str(char *page, int count, __u64 flags, __u64 flags2,
 833                           const char *sep)
 834 {
 835         __u64 mask;
 836         int i, ret = 0;
 837
 838         for (i = 0, mask = 1; i < 64; i++, mask <<= 1) {
 839                 if (flags & mask)
 840                         ret += snprintf(page + ret, count - ret, "%s%s",
 841                                         ret ? sep : "", obd_connect_names[i]);
 842         }
 843
 844         if (flags & ~(mask - 1))
 845                 ret += snprintf(page + ret, count - ret,
 846                                 "%sunknown_%#llx",
 847                                 ret ? sep : "", flags & ~(mask - 1));
 848
 849         if (!(flags & OBD_CONNECT_FLAGS2) || flags2 == 0)
 850                 return ret;
 851
 852         for (i = 64, mask = 1; obd_connect_names[i] != NULL; i++, mask <<= 1) {
 853                 if (flags2 & mask)
 854                         ret += snprintf(page + ret, count - ret, "%s%s",
 855                                         ret ? sep : "", obd_connect_names[i]);
 856         }
 857
 858         if (flags2 & ~(mask - 1))
 859                 ret += snprintf(page + ret, count - ret,
 860                                 "%sunknown2_%#llx",
 861                                 ret ? sep : "", flags2 & ~(mask - 1));
 862
 863         return ret;
 864 }
 865 EXPORT_SYMBOL(obd_connect_flags2str);
 866
 867 void
 868 obd_connect_data_seqprint(struct seq_file *m, struct obd_connect_data *ocd)
 869 {
 870         __u64 flags;
 871
 872         LASSERT(ocd != NULL);
 873         flags = ocd->ocd_connect_flags;
 874
 875         seq_printf(m, "    connect_data:\n"
 876                    "       flags: %#llx\n"
 877                    "       instance: %u\n",
 878                    ocd->ocd_connect_flags,
 879                    ocd->ocd_instance);
 880         if (flags & OBD_CONNECT_VERSION)
 881                 seq_printf(m, "       target_version: %u.%u.%u.%u\n",
 882                            OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 883                            OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 884                            OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 885                            OBD_OCD_VERSION_FIX(ocd->ocd_version));
 886         if (flags & OBD_CONNECT_MDS)
 887                 seq_printf(m, "       mdt_index: %d\n", ocd->ocd_group);
 888         if (flags & OBD_CONNECT_GRANT)
 889                 seq_printf(m, "       initial_grant: %d\n", ocd->ocd_grant);
 890         if (flags & OBD_CONNECT_INDEX)
 891                 seq_printf(m, "       target_index: %u\n", ocd->ocd_index);
 892         if (flags & OBD_CONNECT_BRW_SIZE)
 893                 seq_printf(m, "       max_brw_size: %d\n", ocd->ocd_brw_size);
 894         if (flags & OBD_CONNECT_IBITS)
 895                 seq_printf(m, "       ibits_known: %#llx\n",
 896                            ocd->ocd_ibits_known);
 897         if (flags & OBD_CONNECT_GRANT_PARAM)
 898                 seq_printf(m, "       grant_block_size: %d\n"
 899                            "       grant_inode_size: %d\n"
 900                            "       grant_max_extent_size: %d\n"
 901                            "       grant_extent_tax: %d\n",
 902                            1 << ocd->ocd_grant_blkbits,
 903                            1 << ocd->ocd_grant_inobits,
 904                            ocd->ocd_grant_max_blks << ocd->ocd_grant_blkbits,
 905                            ocd->ocd_grant_tax_kb << 10);
 906         if (flags & OBD_CONNECT_TRANSNO)
 907                 seq_printf(m, "       first_transno: %#llx\n",
 908                            ocd->ocd_transno);
 909         if (flags & OBD_CONNECT_CKSUM)
 910                 seq_printf(m, "       cksum_types: %#x\n",
 911                            ocd->ocd_cksum_types);
 912         if (flags & OBD_CONNECT_MAX_EASIZE)
 913                 seq_printf(m, "       max_easize: %d\n", ocd->ocd_max_easize);
 914         if (flags & OBD_CONNECT_MAXBYTES)
 915                 seq_printf(m, "       max_object_bytes: %llu\n",
 916                            ocd->ocd_maxbytes);
 917         if (flags & OBD_CONNECT_MULTIMODRPCS)
 918                 seq_printf(m, "       max_mod_rpcs: %hu\n",
 919                            ocd->ocd_maxmodrpcs);
 920 }
 921
 922 int lprocfs_import_seq_show(struct seq_file *m, void *data)
 923 {
 924         char nidstr[LNET_NIDSTR_SIZE];
 925         struct lprocfs_counter ret;
 926         struct lprocfs_counter_header *header;
 927         struct obd_device *obd = (struct obd_device *)data;
 928         struct obd_import *imp;
 929         struct obd_import_conn *conn;
 930         struct obd_connect_data *ocd;
 931         int j;
 932         int k;
 933         int rw = 0;
 934
 935         LASSERT(obd != NULL);
 936         LPROCFS_CLIMP_CHECK(obd);
 937         imp = obd->u.cli.cl_import;
 938         ocd = &imp->imp_connect_data;
 939
 940         seq_printf(m, "import:\n"
 941                    "    name: %s\n"
 942                    "    target: %s\n"
 943                    "    state: %s\n"
 944                    "    connect_flags: [ ",
 945                    obd->obd_name,
 946                    obd2cli_tgt(obd),
 947                    ptlrpc_import_state_name(imp->imp_state));
 948         obd_connect_seq_flags2str(m, imp->imp_connect_data.ocd_connect_flags,
 949                                   imp->imp_connect_data.ocd_connect_flags2,
 950                                   ", ");
 951         seq_printf(m, " ]\n");
 952         obd_connect_data_seqprint(m, ocd);
 953         seq_printf(m, "    import_flags: [ ");
 954         obd_import_flags2str(imp, m);
 955
 956         seq_printf(m, " ]\n"
 957                    "    connection:\n"
 958                    "       failover_nids: [ ");
 959         spin_lock(&imp->imp_lock);
 960         j = 0;
 961         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 962                 libcfs_nid2str_r(conn->oic_conn->c_peer.nid,
 963                                  nidstr, sizeof(nidstr));
 964                 seq_printf(m, "%s%s", j ? ", " : "", nidstr);
 965                 j++;
 966         }
 967         if (imp->imp_connection)
 968                 libcfs_nid2str_r(imp->imp_connection->c_peer.nid,
 969                                  nidstr, sizeof(nidstr));
 970         else
 971                 strncpy(nidstr, "<none>", sizeof(nidstr));
 972         seq_printf(m, " ]\n"
 973                    "       current_connection: %s\n"
 974                    "       connection_attempts: %u\n"
 975                    "       generation: %u\n"
 976                    "       in-progress_invalidations: %u\n"
 977                    "       idle: %lld sec\n",
 978                    nidstr,
 979                    imp->imp_conn_cnt,
 980                    imp->imp_generation,
 981                    atomic_read(&imp->imp_inval_count),
 982                    ktime_get_real_seconds() - imp->imp_last_reply_time);
 983         spin_unlock(&imp->imp_lock);
 984
 985         if (!obd->obd_svc_stats)
 986                 goto out_climp;
 987
 988         header = &obd->obd_svc_stats->ls_cnt_header[PTLRPC_REQWAIT_CNTR];
 989         lprocfs_stats_collect(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR, &ret);
 990         if (ret.lc_count != 0) {
 991                 /* first argument to do_div MUST be __u64 */
 992                 __u64 sum = ret.lc_sum;
 993                 do_div(sum, ret.lc_count);
 994                 ret.lc_sum = sum;
 995         } else
 996                 ret.lc_sum = 0;
 997         seq_printf(m, "    rpcs:\n"
 998                    "       inflight: %u\n"
 999                    "       unregistering: %u\n"
1000                    "       timeouts: %u\n"
1001                    "       avg_waittime: %llu %s\n",
1002                    atomic_read(&imp->imp_inflight),
1003                    atomic_read(&imp->imp_unregistering),
1004                    atomic_read(&imp->imp_timeouts),
1005                    ret.lc_sum, header->lc_units);
1006
1007         k = 0;
1008         for(j = 0; j < IMP_AT_MAX_PORTALS; j++) {
1009                 if (imp->imp_at.iat_portal[j] == 0)
1010                         break;
1011                 k = max_t(unsigned int, k,
1012                           at_get(&imp->imp_at.iat_service_estimate[j]));
1013         }
1014         seq_printf(m, "    service_estimates:\n"
1015                    "       services: %u sec\n"
1016                    "       network: %u sec\n",
1017                    k,
1018                    at_get(&imp->imp_at.iat_net_latency));
1019
1020         seq_printf(m, "    transactions:\n"
1021                    "       last_replay: %llu\n"
1022                    "       peer_committed: %llu\n"
1023                    "       last_checked: %llu\n",
1024                    imp->imp_last_replay_transno,
1025                    imp->imp_peer_committed_transno,
1026                    imp->imp_last_transno_checked);
1027
1028         /* avg data rates */
1029         for (rw = 0; rw <= 1; rw++) {
1030                 lprocfs_stats_collect(obd->obd_svc_stats,
1031                                       PTLRPC_LAST_CNTR + BRW_READ_BYTES + rw,
1032                                       &ret);
1033                 if (ret.lc_sum > 0 && ret.lc_count > 0) {
1034                         /* first argument to do_div MUST be __u64 */
1035                         __u64 sum = ret.lc_sum;
1036                         do_div(sum, ret.lc_count);
1037                         ret.lc_sum = sum;
1038                         seq_printf(m, "    %s_data_averages:\n"
1039                                    "       bytes_per_rpc: %llu\n",
1040                                    rw ? "write" : "read",
1041                                    ret.lc_sum);
1042                 }
1043                 k = (int)ret.lc_sum;
1044                 j = opcode_offset(OST_READ + rw) + EXTRA_MAX_OPCODES;
1045                 header = &obd->obd_svc_stats->ls_cnt_header[j];
1046                 lprocfs_stats_collect(obd->obd_svc_stats, j, &ret);
1047                 if (ret.lc_sum > 0 && ret.lc_count != 0) {
1048                         /* first argument to do_div MUST be __u64 */
1049                         __u64 sum = ret.lc_sum;
1050                         do_div(sum, ret.lc_count);
1051                         ret.lc_sum = sum;
1052                         seq_printf(m, "       %s_per_rpc: %llu\n",
1053                                    header->lc_units, ret.lc_sum);
1054                         j = (int)ret.lc_sum;
1055                         if (j > 0)
1056                                 seq_printf(m, "       MB_per_sec: %u.%.02u\n",
1057                                            k / j, (100 * k / j) % 100);
1058                 }
1059         }
1060
1061 out_climp:
1062         LPROCFS_CLIMP_EXIT(obd);
1063         return 0;
1064 }
1065 EXPORT_SYMBOL(lprocfs_import_seq_show);
1066
1067 int lprocfs_state_seq_show(struct seq_file *m, void *data)
1068 {
1069         struct obd_device *obd = (struct obd_device *)data;
1070         struct obd_import *imp;
1071         int j, k;
1072
1073         LASSERT(obd != NULL);
1074         LPROCFS_CLIMP_CHECK(obd);
1075         imp = obd->u.cli.cl_import;
1076
1077         seq_printf(m, "current_state: %s\n",
1078                    ptlrpc_import_state_name(imp->imp_state));
1079         seq_printf(m, "state_history:\n");
1080         k = imp->imp_state_hist_idx;
1081         for (j = 0; j < IMP_STATE_HIST_LEN; j++) {
1082                 struct import_state_hist *ish =
1083                         &imp->imp_state_hist[(k + j) % IMP_STATE_HIST_LEN];
1084                 if (ish->ish_state == 0)
1085                         continue;
1086                 seq_printf(m, " - [ %lld, %s ]\n", (s64)ish->ish_time,
1087                            ptlrpc_import_state_name(ish->ish_state));
1088         }
1089
1090         LPROCFS_CLIMP_EXIT(obd);
1091         return 0;
1092 }
1093 EXPORT_SYMBOL(lprocfs_state_seq_show);
1094
1095 int lprocfs_at_hist_helper(struct seq_file *m, struct adaptive_timeout *at)
1096 {
1097         int i;
1098         for (i = 0; i < AT_BINS; i++)
1099                 seq_printf(m, "%3u ", at->at_hist[i]);
1100         seq_printf(m, "\n");
1101         return 0;
1102 }
1103 EXPORT_SYMBOL(lprocfs_at_hist_helper);
1104
1105 /* See also ptlrpc_lprocfs_timeouts_show_seq */
1106 int lprocfs_timeouts_seq_show(struct seq_file *m, void *data)
1107 {
1108         struct obd_device *obd = (struct obd_device *)data;
1109         struct obd_import *imp;
1110         unsigned int cur, worst;
1111         time64_t now, worstt;
1112         int i;
1113
1114         LASSERT(obd != NULL);
1115         LPROCFS_CLIMP_CHECK(obd);
1116         imp = obd->u.cli.cl_import;
1117
1118         now = ktime_get_real_seconds();
1119
1120         /* Some network health info for kicks */
1121         seq_printf(m, "%-10s : %lld, %llds ago\n",
1122                    "last reply", (s64)imp->imp_last_reply_time,
1123                    (s64)(now - imp->imp_last_reply_time));
1124
1125         cur = at_get(&imp->imp_at.iat_net_latency);
1126         worst = imp->imp_at.iat_net_latency.at_worst_ever;
1127         worstt = imp->imp_at.iat_net_latency.at_worst_time;
1128         seq_printf(m, "%-10s : cur %3u  worst %3u (at %lld, %llds ago) ",
1129                    "network", cur, worst, (s64)worstt, (s64)(now - worstt));
1130         lprocfs_at_hist_helper(m, &imp->imp_at.iat_net_latency);
1131
1132         for(i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1133                 if (imp->imp_at.iat_portal[i] == 0)
1134                         break;
1135                 cur = at_get(&imp->imp_at.iat_service_estimate[i]);
1136                 worst = imp->imp_at.iat_service_estimate[i].at_worst_ever;
1137                 worstt = imp->imp_at.iat_service_estimate[i].at_worst_time;
1138                 seq_printf(m, "portal %-2d  : cur %3u  worst %3u (at %lld, %llds ago) ",
1139                            imp->imp_at.iat_portal[i], cur, worst, (s64)worstt,
1140                            (s64)(now - worstt));
1141                 lprocfs_at_hist_helper(m, &imp->imp_at.iat_service_estimate[i]);
1142         }
1143
1144         LPROCFS_CLIMP_EXIT(obd);
1145         return 0;
1146 }
1147 EXPORT_SYMBOL(lprocfs_timeouts_seq_show);
1148
1149 int lprocfs_connect_flags_seq_show(struct seq_file *m, void *data)
1150 {
1151         struct obd_device *obd = data;
1152         __u64 flags;
1153         __u64 flags2;
1154
1155         LPROCFS_CLIMP_CHECK(obd);
1156         flags = obd->u.cli.cl_import->imp_connect_data.ocd_connect_flags;
1157         flags2 = obd->u.cli.cl_import->imp_connect_data.ocd_connect_flags2;
1158         seq_printf(m, "flags=%#llx\n", flags);
1159         seq_printf(m, "flags2=%#llx\n", flags2);
1160         obd_connect_seq_flags2str(m, flags, flags2, "\n");
1161         seq_printf(m, "\n");
1162         LPROCFS_CLIMP_EXIT(obd);
1163         return 0;
1164 }
1165 EXPORT_SYMBOL(lprocfs_connect_flags_seq_show);
1166
1167 static const struct attribute *obd_def_uuid_attrs[] = {
1168         &lustre_attr_uuid.attr,
1169         NULL,
1170 };
1171
1172 static const struct attribute *obd_def_attrs[] = {
1173         &lustre_attr_blocksize.attr,
1174         &lustre_attr_kbytestotal.attr,
1175         &lustre_attr_kbytesfree.attr,
1176         &lustre_attr_kbytesavail.attr,
1177         &lustre_attr_filestotal.attr,
1178         &lustre_attr_filesfree.attr,
1179         &lustre_attr_uuid.attr,
1180         NULL,
1181 };
1182
1183 static void obd_sysfs_release(struct kobject *kobj)
1184 {
1185         struct obd_device *obd = container_of(kobj, struct obd_device,
1186                                               obd_kset.kobj);
1187
1188         complete(&obd->obd_kobj_unregister);
1189 }
1190
1191 int lprocfs_obd_setup(struct obd_device *obd, bool uuid_only)
1192 {
1193         struct lprocfs_vars *debugfs_vars = NULL;
1194         int rc;
1195
1196         if (!obd || obd->obd_magic != OBD_DEVICE_MAGIC)
1197                 return -ENODEV;
1198
1199         rc = kobject_set_name(&obd->obd_kset.kobj, "%s", obd->obd_name);
1200         if (rc)
1201                 return rc;
1202
1203         obd->obd_ktype.sysfs_ops = &lustre_sysfs_ops;
1204         obd->obd_ktype.release = obd_sysfs_release;
1205
1206         obd->obd_kset.kobj.parent = obd->obd_type->typ_kobj;
1207         obd->obd_kset.kobj.ktype = &obd->obd_ktype;
1208         init_completion(&obd->obd_kobj_unregister);
1209         rc = kset_register(&obd->obd_kset);
1210         if (rc)
1211                 return rc;
1212
1213         if (uuid_only)
1214                 obd->obd_attrs = obd_def_uuid_attrs;
1215         else
1216                 obd->obd_attrs = obd_def_attrs;
1217
1218         rc = sysfs_create_files(&obd->obd_kset.kobj, obd->obd_attrs);
1219         if (rc) {
1220                 kset_unregister(&obd->obd_kset);
1221                 return rc;
1222         }
1223
1224         if (!obd->obd_type->typ_procroot)
1225                 debugfs_vars = obd->obd_vars;
1226         obd->obd_debugfs_entry = ldebugfs_register(obd->obd_name,
1227                                                    obd->obd_type->typ_debugfs_entry,
1228                                                    debugfs_vars, obd);
1229         if (IS_ERR_OR_NULL(obd->obd_debugfs_entry)) {
1230                 rc = obd->obd_debugfs_entry ? PTR_ERR(obd->obd_debugfs_entry)
1231                                             : -ENOMEM;
1232                 CERROR("error %d setting up debugfs for %s\n",
1233                        rc, obd->obd_name);
1234                 obd->obd_debugfs_entry = NULL;
1235
1236                 sysfs_remove_files(&obd->obd_kset.kobj, obd->obd_attrs);
1237                 obd->obd_attrs = NULL;
1238                 kset_unregister(&obd->obd_kset);
1239                 return rc;
1240         }
1241
1242         if (obd->obd_proc_entry || !obd->obd_type->typ_procroot)
1243                 GOTO(already_registered, rc);
1244
1245         obd->obd_proc_entry = lprocfs_register(obd->obd_name,
1246                                                obd->obd_type->typ_procroot,
1247                                                obd->obd_vars, obd);
1248         if (IS_ERR(obd->obd_proc_entry)) {
1249                 rc = PTR_ERR(obd->obd_proc_entry);
1250                 CERROR("error %d setting up lprocfs for %s\n",rc,obd->obd_name);
1251                 obd->obd_proc_entry = NULL;
1252
1253                 ldebugfs_remove(&obd->obd_debugfs_entry);
1254                 sysfs_remove_files(&obd->obd_kset.kobj, obd->obd_attrs);
1255                 obd->obd_attrs = NULL;
1256                 kset_unregister(&obd->obd_kset);
1257                 return rc;
1258         }
1259 already_registered:
1260         return rc;
1261 }
1262 EXPORT_SYMBOL(lprocfs_obd_setup);
1263
1264 int lprocfs_obd_cleanup(struct obd_device *obd)
1265 {
1266         if (!obd)
1267                 return -EINVAL;
1268
1269         if (obd->obd_proc_exports_entry) {
1270                 /* Should be no exports left */
1271                 lprocfs_remove(&obd->obd_proc_exports_entry);
1272                 obd->obd_proc_exports_entry = NULL;
1273         }
1274
1275         if (obd->obd_proc_entry) {
1276                 lprocfs_remove(&obd->obd_proc_entry);
1277                 obd->obd_proc_entry = NULL;
1278         }
1279
1280         if (!IS_ERR_OR_NULL(obd->obd_debugfs_entry))
1281                 ldebugfs_remove(&obd->obd_debugfs_entry);
1282
1283         /* obd device never allocated a kset */
1284         if (!obd->obd_kset.kobj.state_initialized)
1285                 return 0;
1286
1287         if (obd->obd_attrs) {
1288                 sysfs_remove_files(&obd->obd_kset.kobj, obd->obd_attrs);
1289                 obd->obd_attrs = NULL;
1290         }
1291
1292         kset_unregister(&obd->obd_kset);
1293         wait_for_completion(&obd->obd_kobj_unregister);
1294         return 0;
1295 }
1296 EXPORT_SYMBOL(lprocfs_obd_cleanup);
1297
1298 int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int cpuid)
1299 {
1300         struct lprocfs_counter *cntr;
1301         unsigned int percpusize;
1302         int rc = -ENOMEM;
1303         unsigned long flags = 0;
1304         int i;
1305
1306         LASSERT(stats->ls_percpu[cpuid] == NULL);
1307         LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);
1308
1309         percpusize = lprocfs_stats_counter_size(stats);
1310         LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[cpuid], percpusize);
1311         if (stats->ls_percpu[cpuid]) {
1312                 rc = 0;
1313                 if (unlikely(stats->ls_biggest_alloc_num <= cpuid)) {
1314                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1315                                 spin_lock_irqsave(&stats->ls_lock, flags);
1316                         else
1317                                 spin_lock(&stats->ls_lock);
1318                         if (stats->ls_biggest_alloc_num <= cpuid)
1319                                 stats->ls_biggest_alloc_num = cpuid + 1;
1320                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) {
1321                                 spin_unlock_irqrestore(&stats->ls_lock, flags);
1322                         } else {
1323                                 spin_unlock(&stats->ls_lock);
1324                         }
1325                 }
1326                 /* initialize the ls_percpu[cpuid] non-zero counter */
1327                 for (i = 0; i < stats->ls_num; ++i) {
1328                         cntr = lprocfs_stats_counter_get(stats, cpuid, i);
1329                         cntr->lc_min = LC_MIN_INIT;
1330                 }
1331         }
1332         return rc;
1333 }
1334
1335 struct lprocfs_stats *lprocfs_alloc_stats(unsigned int num,
1336                                           enum lprocfs_stats_flags flags)
1337 {
1338         struct lprocfs_stats *stats;
1339         unsigned int num_entry;
1340         unsigned int percpusize = 0;
1341         int i;
1342
1343         if (num == 0)
1344                 return NULL;
1345
1346         if (lprocfs_no_percpu_stats != 0)
1347                 flags |= LPROCFS_STATS_FLAG_NOPERCPU;
1348
1349         if (flags & LPROCFS_STATS_FLAG_NOPERCPU)
1350                 num_entry = 1;
1351         else
1352                 num_entry = num_possible_cpus();
1353
1354         /* alloc percpu pointers for all possible cpu slots */
1355         LIBCFS_ALLOC(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1356         if (!stats)
1357                 return NULL;
1358
1359         stats->ls_num = num;
1360         stats->ls_flags = flags;
1361         spin_lock_init(&stats->ls_lock);
1362
1363         /* alloc num of counter headers */
1364         LIBCFS_ALLOC(stats->ls_cnt_header,
1365                      stats->ls_num * sizeof(struct lprocfs_counter_header));
1366         if (!stats->ls_cnt_header)
1367                 goto fail;
1368
1369         if ((flags & LPROCFS_STATS_FLAG_NOPERCPU) != 0) {
1370                 /* contains only one set counters */
1371                 percpusize = lprocfs_stats_counter_size(stats);
1372                 LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[0], percpusize);
1373                 if (!stats->ls_percpu[0])
1374                         goto fail;
1375                 stats->ls_biggest_alloc_num = 1;
1376         } else if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0) {
1377                 /* alloc all percpu data, currently only obd_memory use this */
1378                 for (i = 0; i < num_entry; ++i)
1379                         if (lprocfs_stats_alloc_one(stats, i) < 0)
1380                                 goto fail;
1381         }
1382
1383         return stats;
1384
1385 fail:
1386         lprocfs_free_stats(&stats);
1387         return NULL;
1388 }
1389 EXPORT_SYMBOL(lprocfs_alloc_stats);
1390
1391 void lprocfs_free_stats(struct lprocfs_stats **statsh)
1392 {
1393         struct lprocfs_stats *stats = *statsh;
1394         unsigned int num_entry;
1395         unsigned int percpusize;
1396         unsigned int i;
1397
1398         if (!stats || stats->ls_num == 0)
1399                 return;
1400         *statsh = NULL;
1401
1402         if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU)
1403                 num_entry = 1;
1404         else
1405                 num_entry = num_possible_cpus();
1406
1407         percpusize = lprocfs_stats_counter_size(stats);
1408         for (i = 0; i < num_entry; i++)
1409                 if (stats->ls_percpu[i])
1410                         LIBCFS_FREE(stats->ls_percpu[i], percpusize);
1411         if (stats->ls_cnt_header)
1412                 LIBCFS_FREE(stats->ls_cnt_header, stats->ls_num *
1413                                         sizeof(struct lprocfs_counter_header));
1414         LIBCFS_FREE(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1415 }
1416 EXPORT_SYMBOL(lprocfs_free_stats);
1417
1418 u64 lprocfs_stats_collector(struct lprocfs_stats *stats, int idx,
1419                             enum lprocfs_fields_flags field)
1420 {
1421         unsigned long flags = 0;
1422         unsigned int num_cpu;
1423         unsigned int i;
1424         u64 ret = 0;
1425
1426         LASSERT(stats);
1427
1428         num_cpu = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1429         for (i = 0; i < num_cpu; i++) {
1430                 struct lprocfs_counter *cntr;
1431
1432                 if (!stats->ls_percpu[i])
1433                         continue;
1434
1435                 cntr = lprocfs_stats_counter_get(stats, i, idx);
1436                 ret += lprocfs_read_helper(cntr, &stats->ls_cnt_header[idx],
1437                                            stats->ls_flags, field);
1438         }
1439         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1440         return ret;
1441 }
1442 EXPORT_SYMBOL(lprocfs_stats_collector);
1443
1444 void lprocfs_clear_stats(struct lprocfs_stats *stats)
1445 {
1446         struct lprocfs_counter *percpu_cntr;
1447         int i;
1448         int j;
1449         unsigned int num_entry;
1450         unsigned long flags = 0;
1451
1452         num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1453
1454         for (i = 0; i < num_entry; i++) {
1455                 if (!stats->ls_percpu[i])
1456                         continue;
1457                 for (j = 0; j < stats->ls_num; j++) {
1458                         percpu_cntr = lprocfs_stats_counter_get(stats, i, j);
1459                         percpu_cntr->lc_count           = 0;
1460                         percpu_cntr->lc_min             = LC_MIN_INIT;
1461                         percpu_cntr->lc_max             = 0;
1462                         percpu_cntr->lc_sumsquare       = 0;
1463                         percpu_cntr->lc_sum             = 0;
1464                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1465                                 percpu_cntr->lc_sum_irq = 0;
1466                 }
1467         }
1468
1469         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1470 }
1471 EXPORT_SYMBOL(lprocfs_clear_stats);
1472
1473 static ssize_t lprocfs_stats_seq_write(struct file *file,
1474                                        const char __user *buf,
1475                                        size_t len, loff_t *off)
1476 {
1477         struct seq_file *seq = file->private_data;
1478         struct lprocfs_stats *stats = seq->private;
1479
1480         lprocfs_clear_stats(stats);
1481
1482         return len;
1483 }
1484
1485 static void *lprocfs_stats_seq_start(struct seq_file *p, loff_t *pos)
1486 {
1487         struct lprocfs_stats *stats = p->private;
1488
1489         return (*pos < stats->ls_num) ? pos : NULL;
1490 }
1491
1492 static void lprocfs_stats_seq_stop(struct seq_file *p, void *v)
1493 {
1494 }
1495
1496 static void *lprocfs_stats_seq_next(struct seq_file *p, void *v, loff_t *pos)
1497 {
1498         (*pos)++;
1499
1500         return lprocfs_stats_seq_start(p, pos);
1501 }
1502
1503 /* seq file export of one lprocfs counter */
1504 static int lprocfs_stats_seq_show(struct seq_file *p, void *v)
1505 {
1506         struct lprocfs_stats *stats = p->private;
1507         struct lprocfs_counter_header *hdr;
1508         struct lprocfs_counter ctr;
1509         int idx = *(loff_t *)v;
1510
1511         if (idx == 0) {
1512                 struct timespec64 now;
1513
1514                 ktime_get_real_ts64(&now);
1515                 seq_printf(p, "%-25s %llu.%09lu secs.nsecs\n",
1516                            "snapshot_time", (s64)now.tv_sec, now.tv_nsec);
1517         }
1518
1519         hdr = &stats->ls_cnt_header[idx];
1520         lprocfs_stats_collect(stats, idx, &ctr);
1521
1522         if (ctr.lc_count == 0)
1523                 return 0;
1524
1525         seq_printf(p, "%-25s %lld samples [%s]", hdr->lc_name,
1526                    ctr.lc_count, hdr->lc_units);
1527
1528         if ((hdr->lc_config & LPROCFS_CNTR_AVGMINMAX) && ctr.lc_count > 0) {
1529                 seq_printf(p, " %lld %lld %lld",
1530                            ctr.lc_min, ctr.lc_max, ctr.lc_sum);
1531                 if (hdr->lc_config & LPROCFS_CNTR_STDDEV)
1532                         seq_printf(p, " %llu", ctr.lc_sumsquare);
1533         }
1534         seq_putc(p, '\n');
1535         return 0;
1536 }
1537
1538 static const struct seq_operations lprocfs_stats_seq_sops = {
1539         .start  = lprocfs_stats_seq_start,
1540         .stop   = lprocfs_stats_seq_stop,
1541         .next   = lprocfs_stats_seq_next,
1542         .show   = lprocfs_stats_seq_show,
1543 };
1544
1545 static int lprocfs_stats_seq_open(struct inode *inode, struct file *file)
1546 {
1547         struct seq_file *seq;
1548         int rc;
1549
1550         rc = LPROCFS_ENTRY_CHECK(inode);
1551         if (rc < 0)
1552                 return rc;
1553
1554         rc = seq_open(file, &lprocfs_stats_seq_sops);
1555         if (rc)
1556                 return rc;
1557         seq = file->private_data;
1558         seq->private = inode->i_private ? inode->i_private : PDE_DATA(inode);
1559         return 0;
1560 }
1561
1562 static const struct file_operations lprocfs_stats_seq_fops = {
1563         .owner   = THIS_MODULE,
1564         .open    = lprocfs_stats_seq_open,
1565         .read    = seq_read,
1566         .write   = lprocfs_stats_seq_write,
1567         .llseek  = seq_lseek,
1568         .release = lprocfs_seq_release,
1569 };
1570
1571 int ldebugfs_register_stats(struct dentry *parent, const char *name,
1572                             struct lprocfs_stats *stats)
1573 {
1574         struct dentry *entry;
1575
1576         LASSERT(!IS_ERR_OR_NULL(parent));
1577
1578         entry = debugfs_create_file(name, 0644, parent, stats,
1579                                     &lprocfs_stats_seq_fops);
1580         if (IS_ERR_OR_NULL(entry))
1581                 return entry ? PTR_ERR(entry) : -ENOMEM;
1582
1583         return 0;
1584 }
1585 EXPORT_SYMBOL_GPL(ldebugfs_register_stats);
1586
1587 int lprocfs_register_stats(struct proc_dir_entry *root, const char *name,
1588                            struct lprocfs_stats *stats)
1589 {
1590         struct proc_dir_entry *entry;
1591         LASSERT(root != NULL);
1592
1593         entry = proc_create_data(name, 0644, root,
1594                                  &lprocfs_stats_seq_fops, stats);
1595         if (!entry)
1596                 return -ENOMEM;
1597         return 0;
1598 }
1599 EXPORT_SYMBOL(lprocfs_register_stats);
1600
1601 void lprocfs_counter_init(struct lprocfs_stats *stats, int index,
1602                           unsigned conf, const char *name, const char *units)
1603 {
1604         struct lprocfs_counter_header *header;
1605         struct lprocfs_counter *percpu_cntr;
1606         unsigned long flags = 0;
1607         unsigned int i;
1608         unsigned int num_cpu;
1609
1610         LASSERT(stats != NULL);
1611
1612         header = &stats->ls_cnt_header[index];
1613         LASSERTF(header != NULL, "Failed to allocate stats header:[%d]%s/%s\n",
1614                  index, name, units);
1615
1616         header->lc_config = conf;
1617         header->lc_name   = name;
1618         header->lc_units  = units;
1619
1620         num_cpu = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1621         for (i = 0; i < num_cpu; ++i) {
1622                 if (!stats->ls_percpu[i])
1623                         continue;
1624                 percpu_cntr = lprocfs_stats_counter_get(stats, i, index);
1625                 percpu_cntr->lc_count           = 0;
1626                 percpu_cntr->lc_min             = LC_MIN_INIT;
1627                 percpu_cntr->lc_max             = 0;
1628                 percpu_cntr->lc_sumsquare       = 0;
1629                 percpu_cntr->lc_sum             = 0;
1630                 if ((stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1631                         percpu_cntr->lc_sum_irq = 0;
1632         }
1633         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1634 }
1635 EXPORT_SYMBOL(lprocfs_counter_init);
1636
1637 static const char * const mps_stats[] = {
1638         [LPROC_MD_CLOSE]                = "close",
1639         [LPROC_MD_CREATE]               = "create",
1640         [LPROC_MD_ENQUEUE]              = "enqueue",
1641         [LPROC_MD_GETATTR]              = "getattr",
1642         [LPROC_MD_INTENT_LOCK]          = "intent_lock",
1643         [LPROC_MD_LINK]                 = "link",
1644         [LPROC_MD_RENAME]               = "rename",
1645         [LPROC_MD_SETATTR]              = "setattr",
1646         [LPROC_MD_FSYNC]                = "fsync",
1647         [LPROC_MD_READ_PAGE]            = "read_page",
1648         [LPROC_MD_UNLINK]               = "unlink",
1649         [LPROC_MD_SETXATTR]             = "setxattr",
1650         [LPROC_MD_GETXATTR]             = "getxattr",
1651         [LPROC_MD_INTENT_GETATTR_ASYNC] = "intent_getattr_async",
1652         [LPROC_MD_REVALIDATE_LOCK]      = "revalidate_lock",
1653 };
1654
1655 int lprocfs_alloc_md_stats(struct obd_device *obd,
1656                            unsigned int num_private_stats)
1657 {
1658         struct lprocfs_stats *stats;
1659         unsigned int num_stats;
1660         int rc, i;
1661
1662         /*
1663          * TODO Ensure that this function is only used where
1664          * appropriate by adding an assertion to the effect that
1665          * obd->obd_type->typ_md_ops is not NULL. We can't do this now
1666          * because mdt_procfs_init() uses this function to allocate
1667          * the stats backing /proc/fs/lustre/mdt/.../md_stats but the
1668          * mdt layer does not use the md_ops interface. This is
1669          * confusing and a waste of memory. See LU-2484.
1670          */
1671         LASSERT(obd->obd_proc_entry != NULL);
1672         LASSERT(obd->obd_md_stats == NULL);
1673
1674         num_stats = ARRAY_SIZE(mps_stats) + num_private_stats;
1675         stats = lprocfs_alloc_stats(num_stats, 0);
1676         if (!stats)
1677                 return -ENOMEM;
1678
1679         for (i = 0; i < ARRAY_SIZE(mps_stats); i++) {
1680                 lprocfs_counter_init(stats, i, 0, mps_stats[i], "reqs");
1681                 if (!stats->ls_cnt_header[i].lc_name) {
1682                         CERROR("Missing md_stat initializer md_op operation at offset %d. Aborting.\n",
1683                                i);
1684                         LBUG();
1685                 }
1686         }
1687
1688         rc = lprocfs_register_stats(obd->obd_proc_entry, "md_stats", stats);
1689         if (rc < 0) {
1690                 lprocfs_free_stats(&stats);
1691         } else {
1692                 obd->obd_md_stats = stats;
1693         }
1694
1695         return rc;
1696 }
1697 EXPORT_SYMBOL(lprocfs_alloc_md_stats);
1698
1699 void lprocfs_free_md_stats(struct obd_device *obd)
1700 {
1701         struct lprocfs_stats *stats = obd->obd_md_stats;
1702
1703         if (stats) {
1704                 obd->obd_md_stats = NULL;
1705                 lprocfs_free_stats(&stats);
1706         }
1707 }
1708 EXPORT_SYMBOL(lprocfs_free_md_stats);
1709
1710 void lprocfs_init_ldlm_stats(struct lprocfs_stats *ldlm_stats)
1711 {
1712         lprocfs_counter_init(ldlm_stats,
1713                              LDLM_ENQUEUE - LDLM_FIRST_OPC,
1714                              0, "ldlm_enqueue", "reqs");
1715         lprocfs_counter_init(ldlm_stats,
1716                              LDLM_CONVERT - LDLM_FIRST_OPC,
1717                              0, "ldlm_convert", "reqs");
1718         lprocfs_counter_init(ldlm_stats,
1719                              LDLM_CANCEL - LDLM_FIRST_OPC,
1720                              0, "ldlm_cancel", "reqs");
1721         lprocfs_counter_init(ldlm_stats,
1722                              LDLM_BL_CALLBACK - LDLM_FIRST_OPC,
1723                              0, "ldlm_bl_callback", "reqs");
1724         lprocfs_counter_init(ldlm_stats,
1725                              LDLM_CP_CALLBACK - LDLM_FIRST_OPC,
1726                              0, "ldlm_cp_callback", "reqs");
1727         lprocfs_counter_init(ldlm_stats,
1728                              LDLM_GL_CALLBACK - LDLM_FIRST_OPC,
1729                              0, "ldlm_gl_callback", "reqs");
1730 }
1731 EXPORT_SYMBOL(lprocfs_init_ldlm_stats);
1732
1733 __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
1734                           struct lprocfs_counter_header *header,
1735                           enum lprocfs_stats_flags flags,
1736                           enum lprocfs_fields_flags field)
1737 {
1738         __s64 ret = 0;
1739
1740         if (!lc || !header)
1741                 RETURN(0);
1742
1743         switch (field) {
1744                 case LPROCFS_FIELDS_FLAGS_CONFIG:
1745                         ret = header->lc_config;
1746                         break;
1747                 case LPROCFS_FIELDS_FLAGS_SUM:
1748                         ret = lc->lc_sum;
1749                         if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1750                                 ret += lc->lc_sum_irq;
1751                         break;
1752                 case LPROCFS_FIELDS_FLAGS_MIN:
1753                         ret = lc->lc_min;
1754                         break;
1755                 case LPROCFS_FIELDS_FLAGS_MAX:
1756                         ret = lc->lc_max;
1757                         break;
1758                 case LPROCFS_FIELDS_FLAGS_AVG:
1759                         ret = (lc->lc_max - lc->lc_min) / 2;
1760                         break;
1761                 case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
1762                         ret = lc->lc_sumsquare;
1763                         break;
1764                 case LPROCFS_FIELDS_FLAGS_COUNT:
1765                         ret = lc->lc_count;
1766                         break;
1767                 default:
1768                         break;
1769         };
1770         RETURN(ret);
1771 }
1772 EXPORT_SYMBOL(lprocfs_read_helper);
1773
1774 int lprocfs_read_frac_helper(char *buffer, unsigned long count, long val,
1775                              int mult)
1776 {
1777         long decimal_val, frac_val;
1778         int prtn;
1779
1780         if (count < 10)
1781                 return -EINVAL;
1782
1783         decimal_val = val / mult;
1784         prtn = snprintf(buffer, count, "%ld", decimal_val);
1785         frac_val = val % mult;
1786
1787         if (prtn < (count - 4) && frac_val > 0) {
1788                 long temp_frac;
1789                 int i, temp_mult = 1, frac_bits = 0;
1790
1791                 temp_frac = frac_val * 10;
1792                 buffer[prtn++] = '.';
1793                 while (frac_bits < 2 && (temp_frac / mult) < 1) {
1794                         /* only reserved 2 bits fraction */
1795                         buffer[prtn++] = '0';
1796                         temp_frac *= 10;
1797                         frac_bits++;
1798                 }
1799                 /*
1800                  * Need to think these cases :
1801                  *      1. #echo x.00 > /proc/xxx       output result : x
1802                  *      2. #echo x.0x > /proc/xxx       output result : x.0x
1803                  *      3. #echo x.x0 > /proc/xxx       output result : x.x
1804                  *      4. #echo x.xx > /proc/xxx       output result : x.xx
1805                  *      Only reserved 2 bits fraction.
1806                  */
1807                 for (i = 0; i < (5 - prtn); i++)
1808                         temp_mult *= 10;
1809
1810                 frac_bits = min((int)count - prtn, 3 - frac_bits);
1811                 prtn += snprintf(buffer + prtn, frac_bits, "%ld",
1812                                  frac_val * temp_mult / mult);
1813
1814                 prtn--;
1815                 while (buffer[prtn] < '1' || buffer[prtn] > '9') {
1816                         prtn--;
1817                         if (buffer[prtn] == '.') {
1818                                 prtn--;
1819                                 break;
1820                         }
1821                 }
1822                 prtn++;
1823         }
1824         buffer[prtn++] = '\n';
1825         return prtn;
1826 }
1827 EXPORT_SYMBOL(lprocfs_read_frac_helper);
1828
1829 int lprocfs_seq_read_frac_helper(struct seq_file *m, long val, int mult)
1830 {
1831         long decimal_val, frac_val;
1832
1833         decimal_val = val / mult;
1834         seq_printf(m, "%ld", decimal_val);
1835         frac_val = val % mult;
1836
1837         if (frac_val > 0) {
1838                 frac_val *= 100;
1839                 frac_val /= mult;
1840         }
1841         if (frac_val > 0) {
1842                 /* Three cases: x0, xx, 0x */
1843                 if ((frac_val % 10) != 0)
1844                         seq_printf(m, ".%ld", frac_val);
1845                 else
1846                         seq_printf(m, ".%ld", frac_val / 10);
1847         }
1848
1849         seq_printf(m, "\n");
1850         return 0;
1851 }
1852 EXPORT_SYMBOL(lprocfs_seq_read_frac_helper);
1853
1854 /* Obtains the conversion factor for the unit specified */
1855 static int get_mult(char unit, __u64 *mult)
1856 {
1857         __u64 units = 1;
1858
1859         switch (unit) {
1860         /* peta, tera, giga, mega, and kilo */
1861         case 'p':
1862         case 'P':
1863                 units <<= 10;
1864         case 't':
1865         case 'T':
1866                 units <<= 10;
1867         case 'g':
1868         case 'G':
1869                 units <<= 10;
1870         case 'm':
1871         case 'M':
1872                 units <<= 10;
1873         case 'k':
1874         case 'K':
1875                 units <<= 10;
1876                 break;
1877         /* some tests expect % to be accepted */
1878         case '%':
1879                 units = 1;
1880                 break;
1881         default:
1882                 return -EINVAL;
1883         }
1884
1885         *mult = units;
1886
1887         return 0;
1888 }
1889
1890 /*
1891  * Ensures the numeric string is valid. The function provides the final
1892  * multiplier in the case a unit exists at the end of the string. It also
1893  * locates the start of the whole and fractional parts (if any). This
1894  * function modifies the string so kstrtoull can be used to parse both
1895  * the whole and fraction portions. This function also figures out
1896  * the base of the number.
1897  */
1898 static int preprocess_numeric_str(char *buffer, __u64 *mult, __u64 def_mult,
1899                                   bool allow_units, char **whole, char **frac,
1900                                   unsigned int *base)
1901 {
1902         bool hit_decimal = false;
1903         bool hit_unit = false;
1904         int rc = 0;
1905         char *start;
1906         *mult = def_mult;
1907         *whole = NULL;
1908         *frac = NULL;
1909         *base = 10;
1910
1911         /* a hex string if it starts with "0x" */
1912         if (buffer[0] == '0' && tolower(buffer[1]) == 'x') {
1913                 *base = 16;
1914                 buffer += 2;
1915         }
1916
1917         start = buffer;
1918
1919         while (*buffer) {
1920                 /* allow for a single new line before the null terminator */
1921                 if (*buffer == '\n') {
1922                         *buffer = '\0';
1923                         buffer++;
1924
1925                         if (*buffer)
1926                                 return -EINVAL;
1927
1928                         break;
1929                 }
1930
1931                 /* any chars after our unit indicates a malformed string */
1932                 if (hit_unit)
1933                         return -EINVAL;
1934
1935                 /* ensure we only hit one decimal */
1936                 if (*buffer == '.') {
1937                         if (hit_decimal)
1938                                 return -EINVAL;
1939
1940                         /* if past start, there's a whole part */
1941                         if (start != buffer)
1942                                 *whole = start;
1943
1944                         *buffer = '\0';
1945                         start = buffer + 1;
1946                         hit_decimal = true;
1947                 } else if (!isdigit(*buffer) &&
1948                            !(*base == 16 && isxdigit(*buffer))) {
1949                         if (allow_units) {
1950                                 /* if we allow units, attempt to get mult */
1951                                 hit_unit = true;
1952                                 rc = get_mult(*buffer, mult);
1953                                 if (rc)
1954                                         return rc;
1955
1956                                 /* string stops here, but keep processing */
1957                                 *buffer = '\0';
1958                         } else {
1959                                 /* bad string */
1960                                 return -EINVAL;
1961                         }
1962                 }
1963
1964                 buffer++;
1965         }
1966
1967         if (hit_decimal) {
1968                 /* hit a decimal, make sure there's a fractional part */
1969                 if (!*start)
1970                         return -EINVAL;
1971
1972                 *frac = start;
1973         } else {
1974                 /* didn't hit a decimal, but may have a whole part */
1975                 if (start != buffer && *start)
1976                         *whole = start;
1977         }
1978
1979         /* malformed string if we didn't get anything */
1980         if (!*frac && !*whole)
1981                 return -EINVAL;
1982
1983         return 0;
1984 }
1985
1986 /*
1987  * Parses a numeric string which can contain a whole and fraction portion
1988  * into a __u64. Accepts a multiplier to apply to the value parsed. Also
1989  * allows the string to have a unit at the end. The function handles
1990  * wrapping of the final unsigned value.
1991  */
1992 static int str_to_u64_parse(char *buffer, unsigned long count,
1993                             __u64 *val, __u64 def_mult, bool allow_units)
1994 {
1995         __u64 whole = 0;
1996         __u64 frac = 0;
1997         unsigned int frac_d = 1;
1998         __u64 wrap_indicator = ULLONG_MAX;
1999         int rc = 0;
2000         __u64 mult;
2001         char *strwhole;
2002         char *strfrac;
2003         unsigned int base = 10;
2004
2005         rc = preprocess_numeric_str(buffer, &mult, def_mult, allow_units,
2006                                     &strwhole, &strfrac, &base);
2007
2008         if (rc)
2009                 return rc;
2010
2011         if (mult == 0) {
2012                 *val = 0;
2013                 return 0;
2014         }
2015
2016         /* the multiplier limits how large the value can be */
2017         wrap_indicator = div64_u64(wrap_indicator, mult);
2018
2019         if (strwhole) {
2020                 rc = kstrtoull(strwhole, base, &whole);
2021                 if (rc)
2022                         return rc;
2023
2024                 if (whole > wrap_indicator)
2025                         return -ERANGE;
2026
2027                 whole *= mult;
2028         }
2029
2030         if (strfrac) {
2031                 if (strlen(strfrac) > 10)
2032                         strfrac[10] = '\0';
2033
2034                 rc = kstrtoull(strfrac, base, &frac);
2035                 if (rc)
2036                         return rc;
2037
2038                 /* determine power of fractional portion */
2039                 while (*strfrac) {
2040                         frac_d *= base;
2041                         strfrac++;
2042                 }
2043
2044                 /* fractional portion is too large to perform calculation */
2045                 if (frac > wrap_indicator)
2046                         return -ERANGE;
2047
2048                 frac *= mult;
2049                 do_div(frac, frac_d);
2050         }
2051
2052         /* check that the sum of whole and fraction fits in u64 */
2053         if (whole > (ULLONG_MAX - frac))
2054                 return -ERANGE;
2055
2056         *val = whole + frac;
2057
2058         return 0;
2059 }
2060
2061 /*
2062  * This function parses numeric/hex strings into __s64. It accepts a multiplier
2063  * which will apply to the value parsed. It also can allow the string to
2064  * have a unit as the last character. The function handles overflow/underflow
2065  * of the signed integer.
2066  */
2067 static int str_to_s64_internal(const char __user *buffer, unsigned long count,
2068                                __s64 *val, __u64 def_mult, bool allow_units)
2069 {
2070         char kernbuf[22];
2071         __u64 tmp;
2072         unsigned int offset = 0;
2073         int signed sign = 1;
2074         __u64 max = LLONG_MAX;
2075         int rc = 0;
2076
2077         if (count > (sizeof(kernbuf) - 1))
2078                 return -EINVAL;
2079
2080         if (copy_from_user(kernbuf, buffer, count))
2081                 return -EFAULT;
2082
2083         kernbuf[count] = '\0';
2084
2085         /* keep track of our sign */
2086         if (*kernbuf == '-') {
2087                 sign = -1;
2088                 offset++;
2089                 /* equivalent to max = -LLONG_MIN, avoids overflow */
2090                 max++;
2091         }
2092
2093         rc = str_to_u64_parse(kernbuf + offset, count - offset,
2094                               &tmp, def_mult, allow_units);
2095         if (rc)
2096                 return rc;
2097
2098         /* check for overflow/underflow */
2099         if (max < tmp)
2100                 return -ERANGE;
2101
2102         *val = (__s64)tmp * sign;
2103
2104         return 0;
2105 }
2106
2107 /**
2108  * Convert a user string into a signed 64 bit number. This function produces
2109  * an error when the value parsed from the string times multiplier underflows or
2110  * overflows. This function only accepts strings that contains digits, an
2111  * optional decimal, and a char representing a unit at the end. If a unit is
2112  * specified in the string, the multiplier provided by the caller is ignored.
2113  * This function can also accept hexadecimal strings which are prefixed with
2114  * "0x".
2115  *
2116  * \param[in] buffer    string consisting of numbers, a decimal, and a unit
2117  * \param[in] count     buffer length
2118  * \param[in] val       if successful, the value represented by the string
2119  * \param[in] defunit   default unit if string doesn't contain one
2120  *
2121  * \retval              0 on success
2122  * \retval              negative number on error
2123  */
2124 int lprocfs_str_with_units_to_s64(const char __user *buffer,
2125                                   unsigned long count, __s64 *val, char defunit)
2126 {
2127         __u64 mult = 1;
2128         int rc;
2129
2130         if (defunit != '1') {
2131                 rc = get_mult(defunit, &mult);
2132                 if (rc)
2133                         return rc;
2134         }
2135
2136         return str_to_s64_internal(buffer, count, val, mult, true);
2137 }
2138 EXPORT_SYMBOL(lprocfs_str_with_units_to_s64);
2139
2140 char *lprocfs_strnstr(const char *s1, const char *s2, size_t len)
2141 {
2142         size_t l2;
2143
2144         l2 = strlen(s2);
2145         if (!l2)
2146                 return (char *)s1;
2147         while (len >= l2) {
2148                 len--;
2149                 if (!memcmp(s1, s2, l2))
2150                         return (char *)s1;
2151                 s1++;
2152         }
2153         return NULL;
2154 }
2155 EXPORT_SYMBOL(lprocfs_strnstr);
2156
2157 /**
2158  * Find the string \a name in the input \a buffer, and return a pointer to the
2159  * value immediately following \a name, reducing \a count appropriately.
2160  * If \a name is not found the original \a buffer is returned.
2161  */
2162 char *lprocfs_find_named_value(const char *buffer, const char *name,
2163                                 size_t *count)
2164 {
2165         char *val;
2166         size_t buflen = *count;
2167
2168         /* there is no strnstr() in rhel5 and ubuntu kernels */
2169         val = lprocfs_strnstr(buffer, name, buflen);
2170         if (!val)
2171                 return (char *)buffer;
2172
2173         val += strlen(name);                             /* skip prefix */
2174         while (val < buffer + buflen && isspace(*val)) /* skip separator */
2175                 val++;
2176
2177         *count = 0;
2178         while (val < buffer + buflen && isalnum(*val)) {
2179                 ++*count;
2180                 ++val;
2181         }
2182
2183         return val - *count;
2184 }
2185 EXPORT_SYMBOL(lprocfs_find_named_value);
2186
2187 int ldebugfs_seq_create(struct dentry *parent, const char *name, umode_t mode,
2188                         const struct file_operations *seq_fops, void *data)
2189 {
2190         struct dentry *entry;
2191
2192         /* Disallow secretly (un)writable entries. */
2193         LASSERT((!seq_fops->write) == (!(mode & 0222)));
2194
2195         entry = debugfs_create_file(name, mode, parent, data, seq_fops);
2196         if (IS_ERR_OR_NULL(entry))
2197                 return entry ? PTR_ERR(entry) : -ENOMEM;
2198
2199         return 0;
2200 }
2201 EXPORT_SYMBOL_GPL(ldebugfs_seq_create);
2202
2203 int lprocfs_seq_create(struct proc_dir_entry *parent,
2204                        const char *name,
2205                        mode_t mode,
2206                        const struct file_operations *seq_fops,
2207                        void *data)
2208 {
2209         struct proc_dir_entry *entry;
2210         ENTRY;
2211
2212         /* Disallow secretly (un)writable entries. */
2213         LASSERT((seq_fops->write == NULL) == ((mode & 0222) == 0));
2214
2215         entry = proc_create_data(name, mode, parent, seq_fops, data);
2216
2217         if (!entry)
2218                 RETURN(-ENOMEM);
2219
2220         RETURN(0);
2221 }
2222 EXPORT_SYMBOL(lprocfs_seq_create);
2223
2224 int lprocfs_obd_seq_create(struct obd_device *dev,
2225                            const char *name,
2226                            mode_t mode,
2227                            const struct file_operations *seq_fops,
2228                            void *data)
2229 {
2230         return (lprocfs_seq_create(dev->obd_proc_entry, name,
2231                                    mode, seq_fops, data));
2232 }
2233 EXPORT_SYMBOL(lprocfs_obd_seq_create);
2234
2235 void lprocfs_oh_tally(struct obd_histogram *oh, unsigned int value)
2236 {
2237         if (value >= OBD_HIST_MAX)
2238                 value = OBD_HIST_MAX - 1;
2239
2240         spin_lock(&oh->oh_lock);
2241         oh->oh_buckets[value]++;
2242         spin_unlock(&oh->oh_lock);
2243 }
2244 EXPORT_SYMBOL(lprocfs_oh_tally);
2245
2246 void lprocfs_oh_tally_log2(struct obd_histogram *oh, unsigned int value)
2247 {
2248         unsigned int val = 0;
2249
2250         if (likely(value != 0))
2251                 val = min(fls(value - 1), OBD_HIST_MAX);
2252
2253         lprocfs_oh_tally(oh, val);
2254 }
2255 EXPORT_SYMBOL(lprocfs_oh_tally_log2);
2256
2257 unsigned long lprocfs_oh_sum(struct obd_histogram *oh)
2258 {
2259         unsigned long ret = 0;
2260         int i;
2261
2262         for (i = 0; i < OBD_HIST_MAX; i++)
2263                 ret +=  oh->oh_buckets[i];
2264         return ret;
2265 }
2266 EXPORT_SYMBOL(lprocfs_oh_sum);
2267
2268 void lprocfs_oh_clear(struct obd_histogram *oh)
2269 {
2270         spin_lock(&oh->oh_lock);
2271         memset(oh->oh_buckets, 0, sizeof(oh->oh_buckets));
2272         spin_unlock(&oh->oh_lock);
2273 }
2274 EXPORT_SYMBOL(lprocfs_oh_clear);
2275
2276 ssize_t lustre_attr_show(struct kobject *kobj,
2277                          struct attribute *attr, char *buf)
2278 {
2279         struct lustre_attr *a = container_of(attr, struct lustre_attr, attr);
2280
2281         return a->show ? a->show(kobj, attr, buf) : 0;
2282 }
2283 EXPORT_SYMBOL_GPL(lustre_attr_show);
2284
2285 ssize_t lustre_attr_store(struct kobject *kobj, struct attribute *attr,
2286                           const char *buf, size_t len)
2287 {
2288         struct lustre_attr *a = container_of(attr, struct lustre_attr, attr);
2289
2290         return a->store ? a->store(kobj, attr, buf, len) : len;
2291 }
2292 EXPORT_SYMBOL_GPL(lustre_attr_store);
2293
2294 const struct sysfs_ops lustre_sysfs_ops = {
2295         .show  = lustre_attr_show,
2296         .store = lustre_attr_store,
2297 };
2298 EXPORT_SYMBOL_GPL(lustre_sysfs_ops);
2299
2300 int lprocfs_obd_max_pages_per_rpc_seq_show(struct seq_file *m, void *data)
2301 {
2302         struct obd_device *dev = data;
2303         struct client_obd *cli = &dev->u.cli;
2304
2305         spin_lock(&cli->cl_loi_list_lock);
2306         seq_printf(m, "%d\n", cli->cl_max_pages_per_rpc);
2307         spin_unlock(&cli->cl_loi_list_lock);
2308         return 0;
2309 }
2310 EXPORT_SYMBOL(lprocfs_obd_max_pages_per_rpc_seq_show);
2311
2312 ssize_t lprocfs_obd_max_pages_per_rpc_seq_write(struct file *file,
2313                                                 const char __user *buffer,
2314                                                 size_t count, loff_t *off)
2315 {
2316         struct obd_device *dev =
2317                 ((struct seq_file *)file->private_data)->private;
2318         struct client_obd *cli = &dev->u.cli;
2319         struct obd_connect_data *ocd = &cli->cl_import->imp_connect_data;
2320         int chunk_mask, rc;
2321         s64 val;
2322
2323         rc = lprocfs_str_with_units_to_s64(buffer, count, &val, '1');
2324         if (rc)
2325                 return rc;
2326         if (val < 0)
2327                 return -ERANGE;
2328
2329         /* if the max_pages is specified in bytes, convert to pages */
2330         if (val >= ONE_MB_BRW_SIZE)
2331                 val >>= PAGE_SHIFT;
2332
2333         LPROCFS_CLIMP_CHECK(dev);
2334
2335         chunk_mask = ~((1 << (cli->cl_chunkbits - PAGE_SHIFT)) - 1);
2336         /* max_pages_per_rpc must be chunk aligned */
2337         val = (val + ~chunk_mask) & chunk_mask;
2338         if (val == 0 || (ocd->ocd_brw_size != 0 &&
2339                          val > ocd->ocd_brw_size >> PAGE_SHIFT)) {
2340                 LPROCFS_CLIMP_EXIT(dev);
2341                 return -ERANGE;
2342         }
2343         spin_lock(&cli->cl_loi_list_lock);
2344         cli->cl_max_pages_per_rpc = val;
2345         client_adjust_max_dirty(cli);
2346         spin_unlock(&cli->cl_loi_list_lock);
2347
2348         LPROCFS_CLIMP_EXIT(dev);
2349         return count;
2350 }
2351 EXPORT_SYMBOL(lprocfs_obd_max_pages_per_rpc_seq_write);
2352
2353 ssize_t short_io_bytes_show(struct kobject *kobj, struct attribute *attr,
2354                             char *buf)
2355 {
2356         struct obd_device *dev = container_of(kobj, struct obd_device,
2357                                               obd_kset.kobj);
2358         struct client_obd *cli = &dev->u.cli;
2359         int rc;
2360
2361         spin_lock(&cli->cl_loi_list_lock);
2362         rc = sprintf(buf, "%d\n", cli->cl_max_short_io_bytes);
2363         spin_unlock(&cli->cl_loi_list_lock);
2364         return rc;
2365 }
2366 EXPORT_SYMBOL(short_io_bytes_show);
2367
2368 /* Used to catch people who think they're specifying pages. */
2369 #define MIN_SHORT_IO_BYTES 64U
2370
2371 ssize_t short_io_bytes_store(struct kobject *kobj, struct attribute *attr,
2372                              const char *buffer, size_t count)
2373 {
2374         struct obd_device *dev = container_of(kobj, struct obd_device,
2375                                               obd_kset.kobj);
2376         struct client_obd *cli = &dev->u.cli;
2377         u32 val;
2378         int rc;
2379
2380         LPROCFS_CLIMP_CHECK(dev);
2381
2382         rc = kstrtouint(buffer, 0, &val);
2383         if (rc)
2384                 GOTO(out, rc);
2385
2386         if (val && (val < MIN_SHORT_IO_BYTES || val > OBD_MAX_SHORT_IO_BYTES))
2387                 GOTO(out, rc = -ERANGE);
2388
2389         rc = count;
2390
2391         spin_lock(&cli->cl_loi_list_lock);
2392         if (val > (cli->cl_max_pages_per_rpc << PAGE_SHIFT))
2393                 rc = -ERANGE;
2394         else
2395                 cli->cl_max_short_io_bytes = val;
2396         spin_unlock(&cli->cl_loi_list_lock);
2397
2398 out:
2399         LPROCFS_CLIMP_EXIT(dev);
2400         return rc;
2401 }
2402 EXPORT_SYMBOL(short_io_bytes_store);
2403
2404 int lprocfs_wr_root_squash(const char __user *buffer, unsigned long count,
2405                            struct root_squash_info *squash, char *name)
2406 {
2407         int rc;
2408         char kernbuf[64], *tmp, *errmsg;
2409         unsigned long uid, gid;
2410         ENTRY;
2411
2412         if (count >= sizeof(kernbuf)) {
2413                 errmsg = "string too long";
2414                 GOTO(failed_noprint, rc = -EINVAL);
2415         }
2416         if (copy_from_user(kernbuf, buffer, count)) {
2417                 errmsg = "bad address";
2418                 GOTO(failed_noprint, rc = -EFAULT);
2419         }
2420         kernbuf[count] = '\0';
2421
2422         /* look for uid gid separator */
2423         tmp = strchr(kernbuf, ':');
2424         if (!tmp) {
2425                 errmsg = "needs uid:gid format";
2426                 GOTO(failed, rc = -EINVAL);
2427         }
2428         *tmp = '\0';
2429         tmp++;
2430
2431         /* parse uid */
2432         if (kstrtoul(kernbuf, 0, &uid) != 0) {
2433                 errmsg = "bad uid";
2434                 GOTO(failed, rc = -EINVAL);
2435         }
2436
2437         /* parse gid */
2438         if (kstrtoul(tmp, 0, &gid) != 0) {
2439                 errmsg = "bad gid";
2440                 GOTO(failed, rc = -EINVAL);
2441         }
2442
2443         squash->rsi_uid = uid;
2444         squash->rsi_gid = gid;
2445
2446         LCONSOLE_INFO("%s: root_squash is set to %u:%u\n",
2447                       name, squash->rsi_uid, squash->rsi_gid);
2448         RETURN(count);
2449
2450 failed:
2451         if (tmp) {
2452                 tmp--;
2453                 *tmp = ':';
2454         }
2455         CWARN("%s: failed to set root_squash to \"%s\", %s, rc = %d\n",
2456               name, kernbuf, errmsg, rc);
2457         RETURN(rc);
2458 failed_noprint:
2459         CWARN("%s: failed to set root_squash due to %s, rc = %d\n",
2460               name, errmsg, rc);
2461         RETURN(rc);
2462 }
2463 EXPORT_SYMBOL(lprocfs_wr_root_squash);
2464
2465
2466 int lprocfs_wr_nosquash_nids(const char __user *buffer, unsigned long count,
2467                              struct root_squash_info *squash, char *name)
2468 {
2469         int rc;
2470         char *kernbuf = NULL;
2471         char *errmsg;
2472         struct list_head tmp;
2473         int len = count;
2474         ENTRY;
2475
2476         if (count > 4096) {
2477                 errmsg = "string too long";
2478                 GOTO(failed, rc = -EINVAL);
2479         }
2480
2481         OBD_ALLOC(kernbuf, count + 1);
2482         if (!kernbuf) {
2483                 errmsg = "no memory";
2484                 GOTO(failed, rc = -ENOMEM);
2485         }
2486         if (copy_from_user(kernbuf, buffer, count)) {
2487                 errmsg = "bad address";
2488                 GOTO(failed, rc = -EFAULT);
2489         }
2490         kernbuf[count] = '\0';
2491
2492         if (count > 0 && kernbuf[count - 1] == '\n')
2493                 len = count - 1;
2494
2495         if ((len == 4 && strncmp(kernbuf, "NONE", len) == 0) ||
2496             (len == 5 && strncmp(kernbuf, "clear", len) == 0)) {
2497                 /* empty string is special case */
2498                 down_write(&squash->rsi_sem);
2499                 if (!list_empty(&squash->rsi_nosquash_nids))
2500                         cfs_free_nidlist(&squash->rsi_nosquash_nids);
2501                 up_write(&squash->rsi_sem);
2502                 LCONSOLE_INFO("%s: nosquash_nids is cleared\n", name);
2503                 OBD_FREE(kernbuf, count + 1);
2504                 RETURN(count);
2505         }
2506
2507         INIT_LIST_HEAD(&tmp);
2508         if (cfs_parse_nidlist(kernbuf, count, &tmp) <= 0) {
2509                 errmsg = "can't parse";
2510                 GOTO(failed, rc = -EINVAL);
2511         }
2512         LCONSOLE_INFO("%s: nosquash_nids set to %s\n",
2513                       name, kernbuf);
2514         OBD_FREE(kernbuf, count + 1);
2515         kernbuf = NULL;
2516
2517         down_write(&squash->rsi_sem);
2518         if (!list_empty(&squash->rsi_nosquash_nids))
2519                 cfs_free_nidlist(&squash->rsi_nosquash_nids);
2520         list_splice(&tmp, &squash->rsi_nosquash_nids);
2521         up_write(&squash->rsi_sem);
2522
2523         RETURN(count);
2524
2525 failed:
2526         if (kernbuf) {
2527                 CWARN("%s: failed to set nosquash_nids to \"%s\", %s rc = %d\n",
2528                       name, kernbuf, errmsg, rc);
2529                 OBD_FREE(kernbuf, count + 1);
2530         } else {
2531                 CWARN("%s: failed to set nosquash_nids due to %s rc = %d\n",
2532                       name, errmsg, rc);
2533         }
2534         RETURN(rc);
2535 }
2536 EXPORT_SYMBOL(lprocfs_wr_nosquash_nids);
2537
2538 #endif /* CONFIG_PROC_FS*/