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 == NULL || name == NULL || fops == NULL)
  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, const char *format, ...)
 111 {
 112         struct proc_dir_entry *entry;
 113         char *dest;
 114         va_list ap;
 115
 116         if (parent == NULL || format == NULL)
 117                 return NULL;
 118
 119         OBD_ALLOC_WAIT(dest, MAX_STRING_SIZE + 1);
 120         if (dest == NULL)
 121                 return NULL;
 122
 123         va_start(ap, format);
 124         vsnprintf(dest, MAX_STRING_SIZE, format, ap);
 125         va_end(ap);
 126
 127         entry = proc_symlink(name, parent, dest);
 128         if (entry == NULL)
 129                 CERROR("LprocFS: Could not create symbolic link from "
 130                        "%s to %s\n", name, dest);
 131
 132         OBD_FREE(dest, MAX_STRING_SIZE + 1);
 133         return entry;
 134 }
 135 EXPORT_SYMBOL(lprocfs_add_symlink);
 136
 137 static const struct file_operations lprocfs_generic_fops = { };
 138
 139 int ldebugfs_add_vars(struct dentry *parent, struct lprocfs_vars *list,
 140                       void *data)
 141 {
 142         if (IS_ERR_OR_NULL(parent) || IS_ERR_OR_NULL(list))
 143                 return -EINVAL;
 144
 145         while (list->name) {
 146                 struct dentry *entry;
 147                 umode_t mode = 0;
 148
 149                 if (list->proc_mode != 0000) {
 150                         mode = list->proc_mode;
 151                 } else if (list->fops) {
 152                         if (list->fops->read)
 153                                 mode = 0444;
 154                         if (list->fops->write)
 155                                 mode |= 0200;
 156                 }
 157                 entry = debugfs_create_file(list->name, mode, parent,
 158                                             list->data ? : data,
 159                                             list->fops ? : &lprocfs_generic_fops);
 160                 if (IS_ERR_OR_NULL(entry))
 161                         return entry ? PTR_ERR(entry) : -ENOMEM;
 162                 list++;
 163         }
 164         return 0;
 165 }
 166 EXPORT_SYMBOL_GPL(ldebugfs_add_vars);
 167
 168 /**
 169  * Add /proc entries.
 170  *
 171  * \param root [in]  The parent proc entry on which new entry will be added.
 172  * \param list [in]  Array of proc entries to be added.
 173  * \param data [in]  The argument to be passed when entries read/write routines
 174  *                   are called through /proc file.
 175  *
 176  * \retval 0   on success
 177  *         < 0 on error
 178  */
 179 int
 180 lprocfs_add_vars(struct proc_dir_entry *root, struct lprocfs_vars *list,
 181                  void *data)
 182 {
 183         if (root == NULL || list == NULL)
 184                 return -EINVAL;
 185
 186         while (list->name != NULL) {
 187                 struct proc_dir_entry *proc;
 188                 mode_t mode = 0;
 189
 190                 if (list->proc_mode != 0000) {
 191                         mode = list->proc_mode;
 192                 } else if (list->fops) {
 193                         if (list->fops->read)
 194                                 mode = 0444;
 195                         if (list->fops->write)
 196                                 mode |= 0200;
 197                 }
 198                 proc = proc_create_data(list->name, mode, root,
 199                                         list->fops ?: &lprocfs_generic_fops,
 200                                         list->data ?: data);
 201                 if (proc == NULL)
 202                         return -ENOMEM;
 203                 list++;
 204         }
 205         return 0;
 206 }
 207 EXPORT_SYMBOL(lprocfs_add_vars);
 208
 209 void ldebugfs_remove(struct dentry **entryp)
 210 {
 211         debugfs_remove_recursive(*entryp);
 212         *entryp = NULL;
 213 }
 214 EXPORT_SYMBOL_GPL(ldebugfs_remove);
 215
 216 #ifndef HAVE_REMOVE_PROC_SUBTREE
 217 /* for b=10866, global variable */
 218 DECLARE_RWSEM(_lprocfs_lock);
 219 EXPORT_SYMBOL(_lprocfs_lock);
 220
 221 static void lprocfs_remove_nolock(struct proc_dir_entry **proot)
 222 {
 223         struct proc_dir_entry *root = *proot;
 224         struct proc_dir_entry *temp = root;
 225         struct proc_dir_entry *rm_entry;
 226         struct proc_dir_entry *parent;
 227
 228         *proot = NULL;
 229         if (root == NULL || IS_ERR(root))
 230                 return;
 231
 232         parent = root->parent;
 233         LASSERT(parent != NULL);
 234
 235         while (1) {
 236                 while (temp->subdir != NULL)
 237                         temp = temp->subdir;
 238
 239                 rm_entry = temp;
 240                 temp = temp->parent;
 241
 242                 /* Memory corruption once caused this to fail, and
 243                    without this LASSERT we would loop here forever. */
 244                 LASSERTF(strlen(rm_entry->name) == rm_entry->namelen,
 245                          "0x%p  %s/%s len %d\n", rm_entry, temp->name,
 246                          rm_entry->name, (int)strlen(rm_entry->name));
 247
 248                 remove_proc_entry(rm_entry->name, temp);
 249                 if (temp == parent)
 250                         break;
 251         }
 252 }
 253
 254 int remove_proc_subtree(const char *name, struct proc_dir_entry *parent)
 255 {
 256         struct proc_dir_entry    *t = NULL;
 257         struct proc_dir_entry   **p;
 258         int                       len, busy = 0;
 259
 260         LASSERT(parent != NULL);
 261         len = strlen(name);
 262
 263         down_write(&_lprocfs_lock);
 264         /* lookup target name */
 265         for (p = &parent->subdir; *p; p = &(*p)->next) {
 266                 if ((*p)->namelen != len)
 267                         continue;
 268                 if (memcmp(name, (*p)->name, len))
 269                         continue;
 270                 t = *p;
 271                 break;
 272         }
 273
 274         if (t) {
 275                 /* verify it's empty: do not count "num_refs" */
 276                 for (p = &t->subdir; *p; p = &(*p)->next) {
 277                         if ((*p)->namelen != strlen("num_refs")) {
 278                                 busy = 1;
 279                                 break;
 280                         }
 281                         if (memcmp("num_refs", (*p)->name,
 282                                    strlen("num_refs"))) {
 283                                 busy = 1;
 284                                 break;
 285                         }
 286                 }
 287         }
 288
 289         if (busy == 0)
 290                 lprocfs_remove_nolock(&t);
 291
 292         up_write(&_lprocfs_lock);
 293         return 0;
 294 }
 295 #endif /* !HAVE_REMOVE_PROC_SUBTREE */
 296
 297 #ifndef HAVE_PROC_REMOVE
 298 void proc_remove(struct proc_dir_entry *de)
 299 {
 300 #ifndef HAVE_REMOVE_PROC_SUBTREE
 301         down_write(&_lprocfs_lock); /* search vs remove race */
 302         lprocfs_remove_nolock(&de);
 303         up_write(&_lprocfs_lock);
 304 #else
 305         if (de)
 306                 remove_proc_subtree(de->name, de->parent);
 307 #endif
 308 }
 309 #endif
 310
 311 void lprocfs_remove(struct proc_dir_entry **rooth)
 312 {
 313         proc_remove(*rooth);
 314         *rooth = NULL;
 315 }
 316 EXPORT_SYMBOL(lprocfs_remove);
 317
 318 void lprocfs_remove_proc_entry(const char *name, struct proc_dir_entry *parent)
 319 {
 320         LASSERT(parent != NULL);
 321         remove_proc_entry(name, parent);
 322 }
 323 EXPORT_SYMBOL(lprocfs_remove_proc_entry);
 324
 325 struct dentry *ldebugfs_register(const char *name, struct dentry *parent,
 326                                  struct lprocfs_vars *list, void *data)
 327 {
 328         struct dentry *entry;
 329
 330         entry = debugfs_create_dir(name, parent);
 331         if (IS_ERR_OR_NULL(entry)) {
 332                 entry = entry ?: ERR_PTR(-ENOMEM);
 333                 goto out;
 334         }
 335
 336         if (!IS_ERR_OR_NULL(list)) {
 337                 int rc;
 338
 339                 rc = ldebugfs_add_vars(entry, list, data);
 340                 if (rc) {
 341                         debugfs_remove(entry);
 342                         entry = ERR_PTR(rc);
 343                 }
 344         }
 345 out:
 346         return entry;
 347 }
 348 EXPORT_SYMBOL_GPL(ldebugfs_register);
 349
 350 struct proc_dir_entry *
 351 lprocfs_register(const char *name, struct proc_dir_entry *parent,
 352                  struct lprocfs_vars *list, void *data)
 353 {
 354         struct proc_dir_entry *newchild;
 355
 356         newchild = proc_mkdir(name, parent);
 357         if (newchild == NULL)
 358                 return ERR_PTR(-ENOMEM);
 359
 360         if (list != NULL) {
 361                 int rc = lprocfs_add_vars(newchild, list, data);
 362                 if (rc) {
 363                         lprocfs_remove(&newchild);
 364                         return ERR_PTR(rc);
 365                 }
 366         }
 367         return newchild;
 368 }
 369 EXPORT_SYMBOL(lprocfs_register);
 370
 371 /* Generic callbacks */
 372 int lprocfs_uuid_seq_show(struct seq_file *m, void *data)
 373 {
 374         struct obd_device *obd = data;
 375
 376         LASSERT(obd != NULL);
 377         seq_printf(m, "%s\n", obd->obd_uuid.uuid);
 378         return 0;
 379 }
 380 EXPORT_SYMBOL(lprocfs_uuid_seq_show);
 381
 382 static ssize_t uuid_show(struct kobject *kobj, struct attribute *attr,
 383                          char *buf)
 384 {
 385         struct obd_device *obd = container_of(kobj, struct obd_device,
 386                                               obd_kset.kobj);
 387
 388         return sprintf(buf, "%s\n", obd->obd_uuid.uuid);
 389 }
 390 LUSTRE_RO_ATTR(uuid);
 391
 392 int lprocfs_name_seq_show(struct seq_file *m, void *data)
 393 {
 394         struct obd_device *dev = data;
 395
 396         LASSERT(dev != NULL);
 397         seq_printf(m, "%s\n", dev->obd_name);
 398         return 0;
 399 }
 400 EXPORT_SYMBOL(lprocfs_name_seq_show);
 401
 402 static ssize_t blocksize_show(struct kobject *kobj, struct attribute *attr,
 403                               char *buf)
 404 {
 405         struct obd_device *obd = container_of(kobj, struct obd_device,
 406                                               obd_kset.kobj);
 407         struct obd_statfs osfs;
 408         int rc;
 409
 410         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 411                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 412                         OBD_STATFS_NODELAY);
 413         if (!rc)
 414                 return sprintf(buf, "%u\n", osfs.os_bsize);
 415
 416         return rc;
 417 }
 418 LUSTRE_RO_ATTR(blocksize);
 419
 420 static ssize_t kbytestotal_show(struct kobject *kobj, struct attribute *attr,
 421                                 char *buf)
 422 {
 423         struct obd_device *obd = container_of(kobj, struct obd_device,
 424                                               obd_kset.kobj);
 425         struct obd_statfs osfs;
 426         int rc;
 427
 428         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 429                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 430                         OBD_STATFS_NODELAY);
 431         if (!rc) {
 432                 u32 blk_size = osfs.os_bsize >> 10;
 433                 u64 result = osfs.os_blocks;
 434
 435                 while (blk_size >>= 1)
 436                         result <<= 1;
 437
 438                 return sprintf(buf, "%llu\n", result);
 439         }
 440
 441         return rc;
 442 }
 443 LUSTRE_RO_ATTR(kbytestotal);
 444
 445 static ssize_t kbytesfree_show(struct kobject *kobj, struct attribute *attr,
 446                                char *buf)
 447 {
 448         struct obd_device *obd = container_of(kobj, struct obd_device,
 449                                               obd_kset.kobj);
 450         struct obd_statfs osfs;
 451         int rc;
 452
 453         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 454                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 455                         OBD_STATFS_NODELAY);
 456         if (!rc) {
 457                 u32 blk_size = osfs.os_bsize >> 10;
 458                 u64 result = osfs.os_bfree;
 459
 460                 while (blk_size >>= 1)
 461                         result <<= 1;
 462
 463                 return sprintf(buf, "%llu\n", result);
 464         }
 465
 466         return rc;
 467 }
 468 LUSTRE_RO_ATTR(kbytesfree);
 469
 470 static ssize_t kbytesavail_show(struct kobject *kobj, struct attribute *attr,
 471                                 char *buf)
 472 {
 473         struct obd_device *obd = container_of(kobj, struct obd_device,
 474                                               obd_kset.kobj);
 475         struct obd_statfs osfs;
 476         int rc;
 477
 478         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 479                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 480                         OBD_STATFS_NODELAY);
 481         if (!rc) {
 482                 u32 blk_size = osfs.os_bsize >> 10;
 483                 u64 result = osfs.os_bavail;
 484
 485                 while (blk_size >>= 1)
 486                         result <<= 1;
 487
 488                 return sprintf(buf, "%llu\n", result);
 489         }
 490
 491         return rc;
 492 }
 493 LUSTRE_RO_ATTR(kbytesavail);
 494
 495 static ssize_t filestotal_show(struct kobject *kobj, struct attribute *attr,
 496                                char *buf)
 497 {
 498         struct obd_device *obd = container_of(kobj, struct obd_device,
 499                                               obd_kset.kobj);
 500         struct obd_statfs osfs;
 501         int rc;
 502
 503         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 504                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 505                         OBD_STATFS_NODELAY);
 506         if (!rc)
 507                 return sprintf(buf, "%llu\n", osfs.os_files);
 508
 509         return rc;
 510 }
 511 LUSTRE_RO_ATTR(filestotal);
 512
 513 static ssize_t filesfree_show(struct kobject *kobj, struct attribute *attr,
 514                               char *buf)
 515 {
 516         struct obd_device *obd = container_of(kobj, struct obd_device,
 517                                               obd_kset.kobj);
 518         struct obd_statfs osfs;
 519         int rc;
 520
 521         rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 522                         ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 523                         OBD_STATFS_NODELAY);
 524         if (!rc)
 525                 return sprintf(buf, "%llu\n", osfs.os_ffree);
 526
 527         return rc;
 528 }
 529 LUSTRE_RO_ATTR(filesfree);
 530
 531 ssize_t conn_uuid_show(struct kobject *kobj, struct attribute *attr, char *buf)
 532 {
 533         struct obd_device *obd = container_of(kobj, struct obd_device,
 534                                               obd_kset.kobj);
 535         struct ptlrpc_connection *conn;
 536         ssize_t count;
 537
 538         LPROCFS_CLIMP_CHECK(obd);
 539         conn = obd->u.cli.cl_import->imp_connection;
 540         if (conn && obd->u.cli.cl_import)
 541                 count = sprintf(buf, "%s\n", conn->c_remote_uuid.uuid);
 542         else
 543                 count = sprintf(buf, "%s\n", "<none>");
 544
 545         LPROCFS_CLIMP_EXIT(obd);
 546         return count;
 547 }
 548 EXPORT_SYMBOL(conn_uuid_show);
 549
 550 int lprocfs_server_uuid_seq_show(struct seq_file *m, void *data)
 551 {
 552         struct obd_device *obd = data;
 553         struct obd_import *imp;
 554         char *imp_state_name = NULL;
 555         int rc = 0;
 556
 557         LASSERT(obd != NULL);
 558         LPROCFS_CLIMP_CHECK(obd);
 559         imp = obd->u.cli.cl_import;
 560         imp_state_name = ptlrpc_import_state_name(imp->imp_state);
 561         seq_printf(m, "%s\t%s%s\n", obd2cli_tgt(obd), imp_state_name,
 562                    imp->imp_deactive ? "\tDEACTIVATED" : "");
 563
 564         LPROCFS_CLIMP_EXIT(obd);
 565         return rc;
 566 }
 567 EXPORT_SYMBOL(lprocfs_server_uuid_seq_show);
 568
 569 int lprocfs_conn_uuid_seq_show(struct seq_file *m, void *data)
 570 {
 571         struct obd_device *obd = data;
 572         struct ptlrpc_connection *conn;
 573         int rc = 0;
 574
 575         LASSERT(obd != NULL);
 576
 577         LPROCFS_CLIMP_CHECK(obd);
 578         conn = obd->u.cli.cl_import->imp_connection;
 579         if (conn && obd->u.cli.cl_import)
 580                 seq_printf(m, "%s\n", conn->c_remote_uuid.uuid);
 581         else
 582                 seq_printf(m, "%s\n", "<none>");
 583
 584         LPROCFS_CLIMP_EXIT(obd);
 585         return rc;
 586 }
 587 EXPORT_SYMBOL(lprocfs_conn_uuid_seq_show);
 588
 589 /** add up per-cpu counters */
 590
 591 /**
 592  * Lock statistics structure for access, possibly only on this CPU.
 593  *
 594  * The statistics struct may be allocated with per-CPU structures for
 595  * efficient concurrent update (usually only on server-wide stats), or
 596  * as a single global struct (e.g. for per-client or per-job statistics),
 597  * so the required locking depends on the type of structure allocated.
 598  *
 599  * For per-CPU statistics, pin the thread to the current cpuid so that
 600  * will only access the statistics for that CPU.  If the stats structure
 601  * for the current CPU has not been allocated (or previously freed),
 602  * allocate it now.  The per-CPU statistics do not need locking since
 603  * the thread is pinned to the CPU during update.
 604  *
 605  * For global statistics, lock the stats structure to prevent concurrent update.
 606  *
 607  * \param[in] stats     statistics structure to lock
 608  * \param[in] opc       type of operation:
 609  *                      LPROCFS_GET_SMP_ID: "lock" and return current CPU index
 610  *                              for incrementing statistics for that CPU
 611  *                      LPROCFS_GET_NUM_CPU: "lock" and return number of used
 612  *                              CPU indices to iterate over all indices
 613  * \param[out] flags    CPU interrupt saved state for IRQ-safe locking
 614  *
 615  * \retval cpuid of current thread or number of allocated structs
 616  * \retval negative on error (only for opc LPROCFS_GET_SMP_ID + per-CPU stats)
 617  */
 618 int lprocfs_stats_lock(struct lprocfs_stats *stats,
 619                        enum lprocfs_stats_lock_ops opc,
 620                        unsigned long *flags)
 621 {
 622         if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) {
 623                 if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
 624                         spin_lock_irqsave(&stats->ls_lock, *flags);
 625                 else
 626                         spin_lock(&stats->ls_lock);
 627                 return opc == LPROCFS_GET_NUM_CPU ? 1 : 0;
 628         }
 629
 630         switch (opc) {
 631         case LPROCFS_GET_SMP_ID: {
 632                 unsigned int cpuid = get_cpu();
 633
 634                 if (unlikely(!stats->ls_percpu[cpuid])) {
 635                         int rc = lprocfs_stats_alloc_one(stats, cpuid);
 636
 637                         if (rc < 0) {
 638                                 put_cpu();
 639                                 return rc;
 640                         }
 641                 }
 642                 return cpuid;
 643         }
 644         case LPROCFS_GET_NUM_CPU:
 645                 return stats->ls_biggest_alloc_num;
 646         default:
 647                 LBUG();
 648         }
 649 }
 650
 651 /**
 652  * Unlock statistics structure after access.
 653  *
 654  * Unlock the lock acquired via lprocfs_stats_lock() for global statistics,
 655  * or unpin this thread from the current cpuid for per-CPU statistics.
 656  *
 657  * This function must be called using the same arguments as used when calling
 658  * lprocfs_stats_lock() so that the correct operation can be performed.
 659  *
 660  * \param[in] stats     statistics structure to unlock
 661  * \param[in] opc       type of operation (current cpuid or number of structs)
 662  * \param[in] flags     CPU interrupt saved state for IRQ-safe locking
 663  */
 664 void lprocfs_stats_unlock(struct lprocfs_stats *stats,
 665                           enum lprocfs_stats_lock_ops opc,
 666                           unsigned long *flags)
 667 {
 668         if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) {
 669                 if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
 670                         spin_unlock_irqrestore(&stats->ls_lock, *flags);
 671                 else
 672                         spin_unlock(&stats->ls_lock);
 673         } else if (opc == LPROCFS_GET_SMP_ID) {
 674                 put_cpu();
 675         }
 676 }
 677
 678 /** add up per-cpu counters */
 679 void lprocfs_stats_collect(struct lprocfs_stats *stats, int idx,
 680                            struct lprocfs_counter *cnt)
 681 {
 682         unsigned int                    num_entry;
 683         struct lprocfs_counter          *percpu_cntr;
 684         int                             i;
 685         unsigned long                   flags = 0;
 686
 687         memset(cnt, 0, sizeof(*cnt));
 688
 689         if (stats == NULL) {
 690                 /* set count to 1 to avoid divide-by-zero errs in callers */
 691                 cnt->lc_count = 1;
 692                 return;
 693         }
 694
 695         cnt->lc_min = LC_MIN_INIT;
 696
 697         num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
 698
 699         for (i = 0; i < num_entry; i++) {
 700                 if (stats->ls_percpu[i] == NULL)
 701                         continue;
 702                 percpu_cntr = lprocfs_stats_counter_get(stats, i, idx);
 703
 704                 cnt->lc_count += percpu_cntr->lc_count;
 705                 cnt->lc_sum += percpu_cntr->lc_sum;
 706                 if (percpu_cntr->lc_min < cnt->lc_min)
 707                         cnt->lc_min = percpu_cntr->lc_min;
 708                 if (percpu_cntr->lc_max > cnt->lc_max)
 709                         cnt->lc_max = percpu_cntr->lc_max;
 710                 cnt->lc_sumsquare += percpu_cntr->lc_sumsquare;
 711         }
 712
 713         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
 714 }
 715
 716 static void obd_import_flags2str(struct obd_import *imp, struct seq_file *m)
 717 {
 718         bool first = true;
 719
 720         if (imp->imp_obd->obd_no_recov) {
 721                 seq_printf(m, "no_recov");
 722                 first = false;
 723         }
 724
 725         flag2str(imp, invalid);
 726         flag2str(imp, deactive);
 727         flag2str(imp, replayable);
 728         flag2str(imp, delayed_recovery);
 729         flag2str(imp, vbr_failed);
 730         flag2str(imp, pingable);
 731         flag2str(imp, resend_replay);
 732         flag2str(imp, no_pinger_recover);
 733         flag2str(imp, connect_tried);
 734 }
 735
 736 static const char *obd_connect_names[] = {
 737         /* flags names  */
 738         "read_only",
 739         "lov_index",
 740         "connect_from_mds",
 741         "write_grant",
 742         "server_lock",
 743         "version",
 744         "request_portal",
 745         "acl",
 746         "xattr",
 747         "create_on_write",
 748         "truncate_lock",
 749         "initial_transno",
 750         "inode_bit_locks",
 751         "barrier",
 752         "getattr_by_fid",
 753         "no_oh_for_devices",
 754         "remote_client",
 755         "remote_client_by_force",
 756         "max_byte_per_rpc",
 757         "64bit_qdata",
 758         "mds_capability",
 759         "oss_capability",
 760         "early_lock_cancel",
 761         "som",
 762         "adaptive_timeouts",
 763         "lru_resize",
 764         "mds_mds_connection",
 765         "real_conn",
 766         "change_qunit_size",
 767         "alt_checksum_algorithm",
 768         "fid_is_enabled",
 769         "version_recovery",
 770         "pools",
 771         "grant_shrink",
 772         "skip_orphan",
 773         "large_ea",
 774         "full20",
 775         "layout_lock",
 776         "64bithash",
 777         "object_max_bytes",
 778         "imp_recov",
 779         "jobstats",
 780         "umask",
 781         "einprogress",
 782         "grant_param",
 783         "flock_owner",
 784         "lvb_type",
 785         "nanoseconds_times",
 786         "lightweight_conn",
 787         "short_io",
 788         "pingless",
 789         "flock_deadlock",
 790         "disp_stripe",
 791         "open_by_fid",
 792         "lfsck",
 793         "unknown",
 794         "unlink_close",
 795         "multi_mod_rpcs",
 796         "dir_stripe",
 797         "subtree",
 798         "lockahead",
 799         "bulk_mbits",
 800         "compact_obdo",
 801         "second_flags",
 802         /* flags2 names */
 803         "file_secctx",  /* 0x01 */
 804         "lockaheadv2",  /* 0x02 */
 805         "dir_migrate",  /* 0x04 */
 806         "unknown",      /* 0x08 */
 807         "unknown",      /* 0x10 */
 808         "flr",          /* 0x20 */
 809         "wbc",          /* 0x40 */
 810         NULL
 811 };
 812
 813 void obd_connect_seq_flags2str(struct seq_file *m, __u64 flags, __u64 flags2,
 814                                const char *sep)
 815 {
 816         bool first = true;
 817         __u64 mask;
 818         int i;
 819
 820         for (i = 0, mask = 1; i < 64; i++, mask <<= 1) {
 821                 if (flags & mask) {
 822                         seq_printf(m, "%s%s",
 823                                    first ? "" : sep, obd_connect_names[i]);
 824                         first = false;
 825                 }
 826         }
 827
 828         if (flags & ~(mask - 1)) {
 829                 seq_printf(m, "%sunknown_%#llx",
 830                            first ? "" : sep, flags & ~(mask - 1));
 831                 first = false;
 832         }
 833
 834         if (!(flags & OBD_CONNECT_FLAGS2) || flags2 == 0)
 835                 return;
 836
 837         for (i = 64, mask = 1; obd_connect_names[i] != NULL; i++, mask <<= 1) {
 838                 if (flags2 & mask) {
 839                         seq_printf(m, "%s%s",
 840                                    first ? "" : sep, obd_connect_names[i]);
 841                         first = false;
 842                 }
 843         }
 844
 845         if (flags2 & ~(mask - 1)) {
 846                 seq_printf(m, "%sunknown2_%#llx",
 847                            first ? "" : sep, flags2 & ~(mask - 1));
 848                 first = false;
 849         }
 850 }
 851 EXPORT_SYMBOL(obd_connect_seq_flags2str);
 852
 853 int obd_connect_flags2str(char *page, int count, __u64 flags, __u64 flags2,
 854                           const char *sep)
 855 {
 856         __u64 mask;
 857         int i, ret = 0;
 858
 859         for (i = 0, mask = 1; i < 64; i++, mask <<= 1) {
 860                 if (flags & mask)
 861                         ret += snprintf(page + ret, count - ret, "%s%s",
 862                                         ret ? sep : "", obd_connect_names[i]);
 863         }
 864
 865         if (flags & ~(mask - 1))
 866                 ret += snprintf(page + ret, count - ret,
 867                                 "%sunknown_%#llx",
 868                                 ret ? sep : "", flags & ~(mask - 1));
 869
 870         if (!(flags & OBD_CONNECT_FLAGS2) || flags2 == 0)
 871                 return ret;
 872
 873         for (i = 64, mask = 1; obd_connect_names[i] != NULL; i++, mask <<= 1) {
 874                 if (flags2 & mask)
 875                         ret += snprintf(page + ret, count - ret, "%s%s",
 876                                         ret ? sep : "", obd_connect_names[i]);
 877         }
 878
 879         if (flags2 & ~(mask - 1))
 880                 ret += snprintf(page + ret, count - ret,
 881                                 "%sunknown2_%#llx",
 882                                 ret ? sep : "", flags2 & ~(mask - 1));
 883
 884         return ret;
 885 }
 886 EXPORT_SYMBOL(obd_connect_flags2str);
 887
 888 void
 889 obd_connect_data_seqprint(struct seq_file *m, struct obd_connect_data *ocd)
 890 {
 891         __u64 flags;
 892
 893         LASSERT(ocd != NULL);
 894         flags = ocd->ocd_connect_flags;
 895
 896         seq_printf(m, "    connect_data:\n"
 897                    "       flags: %#llx\n"
 898                    "       instance: %u\n",
 899                    ocd->ocd_connect_flags,
 900                    ocd->ocd_instance);
 901         if (flags & OBD_CONNECT_VERSION)
 902                 seq_printf(m, "       target_version: %u.%u.%u.%u\n",
 903                            OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 904                            OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 905                            OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 906                            OBD_OCD_VERSION_FIX(ocd->ocd_version));
 907         if (flags & OBD_CONNECT_MDS)
 908                 seq_printf(m, "       mdt_index: %d\n", ocd->ocd_group);
 909         if (flags & OBD_CONNECT_GRANT)
 910                 seq_printf(m, "       initial_grant: %d\n", ocd->ocd_grant);
 911         if (flags & OBD_CONNECT_INDEX)
 912                 seq_printf(m, "       target_index: %u\n", ocd->ocd_index);
 913         if (flags & OBD_CONNECT_BRW_SIZE)
 914                 seq_printf(m, "       max_brw_size: %d\n", ocd->ocd_brw_size);
 915         if (flags & OBD_CONNECT_IBITS)
 916                 seq_printf(m, "       ibits_known: %#llx\n",
 917                            ocd->ocd_ibits_known);
 918         if (flags & OBD_CONNECT_GRANT_PARAM)
 919                 seq_printf(m, "       grant_block_size: %d\n"
 920                            "       grant_inode_size: %d\n"
 921                            "       grant_max_extent_size: %d\n"
 922                            "       grant_extent_tax: %d\n",
 923                            1 << ocd->ocd_grant_blkbits,
 924                            1 << ocd->ocd_grant_inobits,
 925                            ocd->ocd_grant_max_blks << ocd->ocd_grant_blkbits,
 926                            ocd->ocd_grant_tax_kb << 10);
 927         if (flags & OBD_CONNECT_TRANSNO)
 928                 seq_printf(m, "       first_transno: %#llx\n",
 929                            ocd->ocd_transno);
 930         if (flags & OBD_CONNECT_CKSUM)
 931                 seq_printf(m, "       cksum_types: %#x\n",
 932                            ocd->ocd_cksum_types);
 933         if (flags & OBD_CONNECT_MAX_EASIZE)
 934                 seq_printf(m, "       max_easize: %d\n", ocd->ocd_max_easize);
 935         if (flags & OBD_CONNECT_MAXBYTES)
 936                 seq_printf(m, "       max_object_bytes: %llu\n",
 937                            ocd->ocd_maxbytes);
 938         if (flags & OBD_CONNECT_MULTIMODRPCS)
 939                 seq_printf(m, "       max_mod_rpcs: %hu\n",
 940                            ocd->ocd_maxmodrpcs);
 941 }
 942
 943 int lprocfs_import_seq_show(struct seq_file *m, void *data)
 944 {
 945         char                            nidstr[LNET_NIDSTR_SIZE];
 946         struct lprocfs_counter          ret;
 947         struct lprocfs_counter_header   *header;
 948         struct obd_device               *obd    = (struct obd_device *)data;
 949         struct obd_import               *imp;
 950         struct obd_import_conn          *conn;
 951         struct obd_connect_data         *ocd;
 952         int                             j;
 953         int                             k;
 954         int                             rw      = 0;
 955
 956         LASSERT(obd != NULL);
 957         LPROCFS_CLIMP_CHECK(obd);
 958         imp = obd->u.cli.cl_import;
 959         ocd = &imp->imp_connect_data;
 960
 961         seq_printf(m, "import:\n"
 962                    "    name: %s\n"
 963                    "    target: %s\n"
 964                    "    state: %s\n"
 965                    "    connect_flags: [ ",
 966                    obd->obd_name,
 967                    obd2cli_tgt(obd),
 968                    ptlrpc_import_state_name(imp->imp_state));
 969         obd_connect_seq_flags2str(m, imp->imp_connect_data.ocd_connect_flags,
 970                                   imp->imp_connect_data.ocd_connect_flags2,
 971                                   ", ");
 972         seq_printf(m, " ]\n");
 973         obd_connect_data_seqprint(m, ocd);
 974         seq_printf(m, "    import_flags: [ ");
 975         obd_import_flags2str(imp, m);
 976
 977         seq_printf(m, " ]\n"
 978                    "    connection:\n"
 979                    "       failover_nids: [ ");
 980         spin_lock(&imp->imp_lock);
 981         j = 0;
 982         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 983                 libcfs_nid2str_r(conn->oic_conn->c_peer.nid,
 984                                  nidstr, sizeof(nidstr));
 985                 seq_printf(m, "%s%s", j ? ", " : "", nidstr);
 986                 j++;
 987         }
 988         if (imp->imp_connection != NULL)
 989                 libcfs_nid2str_r(imp->imp_connection->c_peer.nid,
 990                                  nidstr, sizeof(nidstr));
 991         else
 992                 strncpy(nidstr, "<none>", sizeof(nidstr));
 993         seq_printf(m, " ]\n"
 994                    "       current_connection: %s\n"
 995                    "       connection_attempts: %u\n"
 996                    "       generation: %u\n"
 997                    "       in-progress_invalidations: %u\n",
 998                    nidstr,
 999                    imp->imp_conn_cnt,
1000                    imp->imp_generation,
1001                    atomic_read(&imp->imp_inval_count));
1002         spin_unlock(&imp->imp_lock);
1003
1004         if (obd->obd_svc_stats == NULL)
1005                 goto out_climp;
1006
1007         header = &obd->obd_svc_stats->ls_cnt_header[PTLRPC_REQWAIT_CNTR];
1008         lprocfs_stats_collect(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR, &ret);
1009         if (ret.lc_count != 0) {
1010                 /* first argument to do_div MUST be __u64 */
1011                 __u64 sum = ret.lc_sum;
1012                 do_div(sum, ret.lc_count);
1013                 ret.lc_sum = sum;
1014         } else
1015                 ret.lc_sum = 0;
1016         seq_printf(m, "    rpcs:\n"
1017                    "       inflight: %u\n"
1018                    "       unregistering: %u\n"
1019                    "       timeouts: %u\n"
1020                    "       avg_waittime: %llu %s\n",
1021                    atomic_read(&imp->imp_inflight),
1022                    atomic_read(&imp->imp_unregistering),
1023                    atomic_read(&imp->imp_timeouts),
1024                    ret.lc_sum, header->lc_units);
1025
1026         k = 0;
1027         for(j = 0; j < IMP_AT_MAX_PORTALS; j++) {
1028                 if (imp->imp_at.iat_portal[j] == 0)
1029                         break;
1030                 k = max_t(unsigned int, k,
1031                           at_get(&imp->imp_at.iat_service_estimate[j]));
1032         }
1033         seq_printf(m, "    service_estimates:\n"
1034                    "       services: %u sec\n"
1035                    "       network: %u sec\n",
1036                    k,
1037                    at_get(&imp->imp_at.iat_net_latency));
1038
1039         seq_printf(m, "    transactions:\n"
1040                    "       last_replay: %llu\n"
1041                    "       peer_committed: %llu\n"
1042                    "       last_checked: %llu\n",
1043                    imp->imp_last_replay_transno,
1044                    imp->imp_peer_committed_transno,
1045                    imp->imp_last_transno_checked);
1046
1047         /* avg data rates */
1048         for (rw = 0; rw <= 1; rw++) {
1049                 lprocfs_stats_collect(obd->obd_svc_stats,
1050                                       PTLRPC_LAST_CNTR + BRW_READ_BYTES + rw,
1051                                       &ret);
1052                 if (ret.lc_sum > 0 && ret.lc_count > 0) {
1053                         /* first argument to do_div MUST be __u64 */
1054                         __u64 sum = ret.lc_sum;
1055                         do_div(sum, ret.lc_count);
1056                         ret.lc_sum = sum;
1057                         seq_printf(m, "    %s_data_averages:\n"
1058                                    "       bytes_per_rpc: %llu\n",
1059                                    rw ? "write" : "read",
1060                                    ret.lc_sum);
1061                 }
1062                 k = (int)ret.lc_sum;
1063                 j = opcode_offset(OST_READ + rw) + EXTRA_MAX_OPCODES;
1064                 header = &obd->obd_svc_stats->ls_cnt_header[j];
1065                 lprocfs_stats_collect(obd->obd_svc_stats, j, &ret);
1066                 if (ret.lc_sum > 0 && ret.lc_count != 0) {
1067                         /* first argument to do_div MUST be __u64 */
1068                         __u64 sum = ret.lc_sum;
1069                         do_div(sum, ret.lc_count);
1070                         ret.lc_sum = sum;
1071                         seq_printf(m, "       %s_per_rpc: %llu\n",
1072                                    header->lc_units, ret.lc_sum);
1073                         j = (int)ret.lc_sum;
1074                         if (j > 0)
1075                                 seq_printf(m, "       MB_per_sec: %u.%.02u\n",
1076                                            k / j, (100 * k / j) % 100);
1077                 }
1078         }
1079
1080 out_climp:
1081         LPROCFS_CLIMP_EXIT(obd);
1082         return 0;
1083 }
1084 EXPORT_SYMBOL(lprocfs_import_seq_show);
1085
1086 int lprocfs_state_seq_show(struct seq_file *m, void *data)
1087 {
1088         struct obd_device *obd = (struct obd_device *)data;
1089         struct obd_import *imp;
1090         int j, k;
1091
1092         LASSERT(obd != NULL);
1093         LPROCFS_CLIMP_CHECK(obd);
1094         imp = obd->u.cli.cl_import;
1095
1096         seq_printf(m, "current_state: %s\n",
1097                    ptlrpc_import_state_name(imp->imp_state));
1098         seq_printf(m, "state_history:\n");
1099         k = imp->imp_state_hist_idx;
1100         for (j = 0; j < IMP_STATE_HIST_LEN; j++) {
1101                 struct import_state_hist *ish =
1102                         &imp->imp_state_hist[(k + j) % IMP_STATE_HIST_LEN];
1103                 if (ish->ish_state == 0)
1104                         continue;
1105                 seq_printf(m, " - [ %lld, %s ]\n", (s64)ish->ish_time,
1106                            ptlrpc_import_state_name(ish->ish_state));
1107         }
1108
1109         LPROCFS_CLIMP_EXIT(obd);
1110         return 0;
1111 }
1112 EXPORT_SYMBOL(lprocfs_state_seq_show);
1113
1114 int lprocfs_at_hist_helper(struct seq_file *m, struct adaptive_timeout *at)
1115 {
1116         int i;
1117         for (i = 0; i < AT_BINS; i++)
1118                 seq_printf(m, "%3u ", at->at_hist[i]);
1119         seq_printf(m, "\n");
1120         return 0;
1121 }
1122 EXPORT_SYMBOL(lprocfs_at_hist_helper);
1123
1124 /* See also ptlrpc_lprocfs_timeouts_show_seq */
1125 int lprocfs_timeouts_seq_show(struct seq_file *m, void *data)
1126 {
1127         struct obd_device *obd = (struct obd_device *)data;
1128         struct obd_import *imp;
1129         unsigned int cur, worst;
1130         time64_t now, worstt;
1131         int i;
1132
1133         LASSERT(obd != NULL);
1134         LPROCFS_CLIMP_CHECK(obd);
1135         imp = obd->u.cli.cl_import;
1136
1137         now = ktime_get_real_seconds();
1138
1139         /* Some network health info for kicks */
1140         seq_printf(m, "%-10s : %lld, %llds ago\n",
1141                    "last reply", (s64)imp->imp_last_reply_time,
1142                    (s64)(now - imp->imp_last_reply_time));
1143
1144         cur = at_get(&imp->imp_at.iat_net_latency);
1145         worst = imp->imp_at.iat_net_latency.at_worst_ever;
1146         worstt = imp->imp_at.iat_net_latency.at_worst_time;
1147         seq_printf(m, "%-10s : cur %3u  worst %3u (at %lld, %llds ago) ",
1148                    "network", cur, worst, (s64)worstt, (s64)(now - worstt));
1149         lprocfs_at_hist_helper(m, &imp->imp_at.iat_net_latency);
1150
1151         for(i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1152                 if (imp->imp_at.iat_portal[i] == 0)
1153                         break;
1154                 cur = at_get(&imp->imp_at.iat_service_estimate[i]);
1155                 worst = imp->imp_at.iat_service_estimate[i].at_worst_ever;
1156                 worstt = imp->imp_at.iat_service_estimate[i].at_worst_time;
1157                 seq_printf(m, "portal %-2d  : cur %3u  worst %3u (at %lld, %llds ago) ",
1158                            imp->imp_at.iat_portal[i], cur, worst, (s64)worstt,
1159                            (s64)(now - worstt));
1160                 lprocfs_at_hist_helper(m, &imp->imp_at.iat_service_estimate[i]);
1161         }
1162
1163         LPROCFS_CLIMP_EXIT(obd);
1164         return 0;
1165 }
1166 EXPORT_SYMBOL(lprocfs_timeouts_seq_show);
1167
1168 int lprocfs_connect_flags_seq_show(struct seq_file *m, void *data)
1169 {
1170         struct obd_device *obd = data;
1171         __u64 flags;
1172         __u64 flags2;
1173
1174         LPROCFS_CLIMP_CHECK(obd);
1175         flags = obd->u.cli.cl_import->imp_connect_data.ocd_connect_flags;
1176         flags2 = obd->u.cli.cl_import->imp_connect_data.ocd_connect_flags2;
1177         seq_printf(m, "flags=%#llx\n", flags);
1178         seq_printf(m, "flags2=%#llx\n", flags2);
1179         obd_connect_seq_flags2str(m, flags, flags2, "\n");
1180         seq_printf(m, "\n");
1181         LPROCFS_CLIMP_EXIT(obd);
1182         return 0;
1183 }
1184 EXPORT_SYMBOL(lprocfs_connect_flags_seq_show);
1185
1186 static struct attribute *obd_def_uuid_attrs[] = {
1187         &lustre_attr_uuid.attr,
1188         NULL,
1189 };
1190
1191 static struct attribute *obd_def_attrs[] = {
1192         &lustre_attr_blocksize.attr,
1193         &lustre_attr_kbytestotal.attr,
1194         &lustre_attr_kbytesfree.attr,
1195         &lustre_attr_kbytesavail.attr,
1196         &lustre_attr_filestotal.attr,
1197         &lustre_attr_filesfree.attr,
1198         &lustre_attr_uuid.attr,
1199         NULL,
1200 };
1201
1202 static void obd_sysfs_release(struct kobject *kobj)
1203 {
1204         struct obd_device *obd = container_of(kobj, struct obd_device,
1205                                               obd_kset.kobj);
1206
1207         complete(&obd->obd_kobj_unregister);
1208 }
1209
1210 int lprocfs_obd_setup(struct obd_device *obd, bool uuid_only)
1211 {
1212         struct lprocfs_vars *debugfs_vars = NULL;
1213         int rc;
1214
1215         if (!obd || obd->obd_magic != OBD_DEVICE_MAGIC)
1216                 return -ENODEV;
1217
1218         rc = kobject_set_name(&obd->obd_kset.kobj, "%s", obd->obd_name);
1219         if (rc)
1220                 return rc;
1221
1222         obd->obd_ktype.sysfs_ops = &lustre_sysfs_ops;
1223         obd->obd_ktype.release = obd_sysfs_release;
1224         if (obd->obd_attrs)
1225                 obd->obd_ktype.default_attrs = obd->obd_attrs;
1226
1227         obd->obd_kset.kobj.parent = obd->obd_type->typ_kobj;
1228         obd->obd_kset.kobj.ktype = &obd->obd_ktype;
1229         init_completion(&obd->obd_kobj_unregister);
1230         rc = kset_register(&obd->obd_kset);
1231         if (rc)
1232                 return rc;
1233
1234         if (uuid_only)
1235                 obd->obd_attrs_group.attrs = obd_def_uuid_attrs;
1236         else
1237                 obd->obd_attrs_group.attrs = obd_def_attrs;
1238
1239         rc = sysfs_create_group(&obd->obd_kset.kobj, &obd->obd_attrs_group);
1240         if (rc) {
1241                 kset_unregister(&obd->obd_kset);
1242                 return rc;
1243         }
1244
1245         if (!obd->obd_type->typ_procroot)
1246                 debugfs_vars = obd->obd_vars;
1247         obd->obd_debugfs_entry = ldebugfs_register(obd->obd_name,
1248                                                    obd->obd_type->typ_debugfs_entry,
1249                                                    debugfs_vars, obd);
1250         if (IS_ERR_OR_NULL(obd->obd_debugfs_entry)) {
1251                 rc = obd->obd_debugfs_entry ? PTR_ERR(obd->obd_debugfs_entry)
1252                                             : -ENOMEM;
1253                 CERROR("error %d setting up debugfs for %s\n",
1254                        rc, obd->obd_name);
1255                 obd->obd_debugfs_entry = NULL;
1256                 lprocfs_obd_cleanup(obd);
1257                 return rc;
1258         }
1259
1260         if (obd->obd_proc_entry || !obd->obd_type->typ_procroot)
1261                 GOTO(already_registered, rc);
1262
1263         obd->obd_proc_entry = lprocfs_register(obd->obd_name,
1264                                                obd->obd_type->typ_procroot,
1265                                                obd->obd_vars, obd);
1266         if (IS_ERR(obd->obd_proc_entry)) {
1267                 rc = PTR_ERR(obd->obd_proc_entry);
1268                 CERROR("error %d setting up lprocfs for %s\n",rc,obd->obd_name);
1269                 obd->obd_proc_entry = NULL;
1270                 lprocfs_obd_cleanup(obd);
1271         }
1272 already_registered:
1273         return rc;
1274 }
1275 EXPORT_SYMBOL(lprocfs_obd_setup);
1276
1277 int lprocfs_obd_cleanup(struct obd_device *obd)
1278 {
1279         if (!obd)
1280                 return -EINVAL;
1281
1282         if (obd->obd_proc_exports_entry) {
1283                 /* Should be no exports left */
1284                 lprocfs_remove(&obd->obd_proc_exports_entry);
1285                 obd->obd_proc_exports_entry = NULL;
1286         }
1287
1288         if (obd->obd_proc_entry) {
1289                 lprocfs_remove(&obd->obd_proc_entry);
1290                 obd->obd_proc_entry = NULL;
1291         }
1292
1293         if (!IS_ERR_OR_NULL(obd->obd_debugfs_entry))
1294                 ldebugfs_remove(&obd->obd_debugfs_entry);
1295
1296         sysfs_remove_group(&obd->obd_kset.kobj, &obd->obd_attrs_group);
1297         kset_unregister(&obd->obd_kset);
1298         wait_for_completion(&obd->obd_kobj_unregister);
1299
1300         return 0;
1301 }
1302 EXPORT_SYMBOL(lprocfs_obd_cleanup);
1303
1304 int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int cpuid)
1305 {
1306         struct lprocfs_counter  *cntr;
1307         unsigned int            percpusize;
1308         int                     rc = -ENOMEM;
1309         unsigned long           flags = 0;
1310         int                     i;
1311
1312         LASSERT(stats->ls_percpu[cpuid] == NULL);
1313         LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);
1314
1315         percpusize = lprocfs_stats_counter_size(stats);
1316         LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[cpuid], percpusize);
1317         if (stats->ls_percpu[cpuid] != NULL) {
1318                 rc = 0;
1319                 if (unlikely(stats->ls_biggest_alloc_num <= cpuid)) {
1320                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1321                                 spin_lock_irqsave(&stats->ls_lock, flags);
1322                         else
1323                                 spin_lock(&stats->ls_lock);
1324                         if (stats->ls_biggest_alloc_num <= cpuid)
1325                                 stats->ls_biggest_alloc_num = cpuid + 1;
1326                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) {
1327                                 spin_unlock_irqrestore(&stats->ls_lock, flags);
1328                         } else {
1329                                 spin_unlock(&stats->ls_lock);
1330                         }
1331                 }
1332                 /* initialize the ls_percpu[cpuid] non-zero counter */
1333                 for (i = 0; i < stats->ls_num; ++i) {
1334                         cntr = lprocfs_stats_counter_get(stats, cpuid, i);
1335                         cntr->lc_min = LC_MIN_INIT;
1336                 }
1337         }
1338         return rc;
1339 }
1340
1341 struct lprocfs_stats *lprocfs_alloc_stats(unsigned int num,
1342                                           enum lprocfs_stats_flags flags)
1343 {
1344         struct lprocfs_stats    *stats;
1345         unsigned int            num_entry;
1346         unsigned int            percpusize = 0;
1347         int                     i;
1348
1349         if (num == 0)
1350                 return NULL;
1351
1352         if (lprocfs_no_percpu_stats != 0)
1353                 flags |= LPROCFS_STATS_FLAG_NOPERCPU;
1354
1355         if (flags & LPROCFS_STATS_FLAG_NOPERCPU)
1356                 num_entry = 1;
1357         else
1358                 num_entry = num_possible_cpus();
1359
1360         /* alloc percpu pointers for all possible cpu slots */
1361         LIBCFS_ALLOC(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1362         if (stats == NULL)
1363                 return NULL;
1364
1365         stats->ls_num = num;
1366         stats->ls_flags = flags;
1367         spin_lock_init(&stats->ls_lock);
1368
1369         /* alloc num of counter headers */
1370         LIBCFS_ALLOC(stats->ls_cnt_header,
1371                      stats->ls_num * sizeof(struct lprocfs_counter_header));
1372         if (stats->ls_cnt_header == NULL)
1373                 goto fail;
1374
1375         if ((flags & LPROCFS_STATS_FLAG_NOPERCPU) != 0) {
1376                 /* contains only one set counters */
1377                 percpusize = lprocfs_stats_counter_size(stats);
1378                 LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[0], percpusize);
1379                 if (stats->ls_percpu[0] == NULL)
1380                         goto fail;
1381                 stats->ls_biggest_alloc_num = 1;
1382         } else if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0) {
1383                 /* alloc all percpu data, currently only obd_memory use this */
1384                 for (i = 0; i < num_entry; ++i)
1385                         if (lprocfs_stats_alloc_one(stats, i) < 0)
1386                                 goto fail;
1387         }
1388
1389         return stats;
1390
1391 fail:
1392         lprocfs_free_stats(&stats);
1393         return NULL;
1394 }
1395 EXPORT_SYMBOL(lprocfs_alloc_stats);
1396
1397 void lprocfs_free_stats(struct lprocfs_stats **statsh)
1398 {
1399         struct lprocfs_stats *stats = *statsh;
1400         unsigned int num_entry;
1401         unsigned int percpusize;
1402         unsigned int i;
1403
1404         if (stats == NULL || stats->ls_num == 0)
1405                 return;
1406         *statsh = NULL;
1407
1408         if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU)
1409                 num_entry = 1;
1410         else
1411                 num_entry = num_possible_cpus();
1412
1413         percpusize = lprocfs_stats_counter_size(stats);
1414         for (i = 0; i < num_entry; i++)
1415                 if (stats->ls_percpu[i] != NULL)
1416                         LIBCFS_FREE(stats->ls_percpu[i], percpusize);
1417         if (stats->ls_cnt_header != NULL)
1418                 LIBCFS_FREE(stats->ls_cnt_header, stats->ls_num *
1419                                         sizeof(struct lprocfs_counter_header));
1420         LIBCFS_FREE(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1421 }
1422 EXPORT_SYMBOL(lprocfs_free_stats);
1423
1424 u64 lprocfs_stats_collector(struct lprocfs_stats *stats, int idx,
1425                             enum lprocfs_fields_flags field)
1426 {
1427         unsigned long flags = 0;
1428         unsigned int num_cpu;
1429         unsigned int i;
1430         u64 ret = 0;
1431
1432         LASSERT(stats);
1433
1434         num_cpu = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1435         for (i = 0; i < num_cpu; i++) {
1436                 struct lprocfs_counter *cntr;
1437
1438                 if (!stats->ls_percpu[i])
1439                         continue;
1440
1441                 cntr = lprocfs_stats_counter_get(stats, i, idx);
1442                 ret += lprocfs_read_helper(cntr, &stats->ls_cnt_header[idx],
1443                                            stats->ls_flags, field);
1444         }
1445         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1446         return ret;
1447 }
1448 EXPORT_SYMBOL(lprocfs_stats_collector);
1449
1450 void lprocfs_clear_stats(struct lprocfs_stats *stats)
1451 {
1452         struct lprocfs_counter          *percpu_cntr;
1453         int                             i;
1454         int                             j;
1455         unsigned int                    num_entry;
1456         unsigned long                   flags = 0;
1457
1458         num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1459
1460         for (i = 0; i < num_entry; i++) {
1461                 if (stats->ls_percpu[i] == NULL)
1462                         continue;
1463                 for (j = 0; j < stats->ls_num; j++) {
1464                         percpu_cntr = lprocfs_stats_counter_get(stats, i, j);
1465                         percpu_cntr->lc_count           = 0;
1466                         percpu_cntr->lc_min             = LC_MIN_INIT;
1467                         percpu_cntr->lc_max             = 0;
1468                         percpu_cntr->lc_sumsquare       = 0;
1469                         percpu_cntr->lc_sum             = 0;
1470                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1471                                 percpu_cntr->lc_sum_irq = 0;
1472                 }
1473         }
1474
1475         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1476 }
1477 EXPORT_SYMBOL(lprocfs_clear_stats);
1478
1479 static ssize_t lprocfs_stats_seq_write(struct file *file,
1480                                        const char __user *buf,
1481                                        size_t len, loff_t *off)
1482 {
1483         struct seq_file *seq = file->private_data;
1484         struct lprocfs_stats *stats = seq->private;
1485
1486         lprocfs_clear_stats(stats);
1487
1488         return len;
1489 }
1490
1491 static void *lprocfs_stats_seq_start(struct seq_file *p, loff_t *pos)
1492 {
1493         struct lprocfs_stats *stats = p->private;
1494
1495         return (*pos < stats->ls_num) ? pos : NULL;
1496 }
1497
1498 static void lprocfs_stats_seq_stop(struct seq_file *p, void *v)
1499 {
1500 }
1501
1502 static void *lprocfs_stats_seq_next(struct seq_file *p, void *v, loff_t *pos)
1503 {
1504         (*pos)++;
1505
1506         return lprocfs_stats_seq_start(p, pos);
1507 }
1508
1509 /* seq file export of one lprocfs counter */
1510 static int lprocfs_stats_seq_show(struct seq_file *p, void *v)
1511 {
1512         struct lprocfs_stats            *stats  = p->private;
1513         struct lprocfs_counter_header   *hdr;
1514         struct lprocfs_counter           ctr;
1515         int                              idx    = *(loff_t *)v;
1516
1517         if (idx == 0) {
1518                 struct timespec64 now;
1519
1520                 ktime_get_real_ts64(&now);
1521                 seq_printf(p, "%-25s %llu.%09lu secs.nsecs\n",
1522                            "snapshot_time", (s64)now.tv_sec, now.tv_nsec);
1523         }
1524
1525         hdr = &stats->ls_cnt_header[idx];
1526         lprocfs_stats_collect(stats, idx, &ctr);
1527
1528         if (ctr.lc_count == 0)
1529                 return 0;
1530
1531         seq_printf(p, "%-25s %lld samples [%s]", hdr->lc_name,
1532                    ctr.lc_count, hdr->lc_units);
1533
1534         if ((hdr->lc_config & LPROCFS_CNTR_AVGMINMAX) && ctr.lc_count > 0) {
1535                 seq_printf(p, " %lld %lld %lld",
1536                            ctr.lc_min, ctr.lc_max, ctr.lc_sum);
1537                 if (hdr->lc_config & LPROCFS_CNTR_STDDEV)
1538                         seq_printf(p, " %llu", ctr.lc_sumsquare);
1539         }
1540         seq_putc(p, '\n');
1541         return 0;
1542 }
1543
1544 static const struct seq_operations lprocfs_stats_seq_sops = {
1545         .start  = lprocfs_stats_seq_start,
1546         .stop   = lprocfs_stats_seq_stop,
1547         .next   = lprocfs_stats_seq_next,
1548         .show   = lprocfs_stats_seq_show,
1549 };
1550
1551 static int lprocfs_stats_seq_open(struct inode *inode, struct file *file)
1552 {
1553         struct seq_file *seq;
1554         int rc;
1555
1556         rc = LPROCFS_ENTRY_CHECK(inode);
1557         if (rc < 0)
1558                 return rc;
1559
1560         rc = seq_open(file, &lprocfs_stats_seq_sops);
1561         if (rc)
1562                 return rc;
1563         seq = file->private_data;
1564         seq->private = inode->i_private ? inode->i_private : PDE_DATA(inode);
1565         return 0;
1566 }
1567
1568 static const struct file_operations lprocfs_stats_seq_fops = {
1569         .owner   = THIS_MODULE,
1570         .open    = lprocfs_stats_seq_open,
1571         .read    = seq_read,
1572         .write   = lprocfs_stats_seq_write,
1573         .llseek  = seq_lseek,
1574         .release = lprocfs_seq_release,
1575 };
1576
1577 int ldebugfs_register_stats(struct dentry *parent, const char *name,
1578                             struct lprocfs_stats *stats)
1579 {
1580         struct dentry *entry;
1581
1582         LASSERT(!IS_ERR_OR_NULL(parent));
1583
1584         entry = debugfs_create_file(name, 0644, parent, stats,
1585                                     &lprocfs_stats_seq_fops);
1586         if (IS_ERR_OR_NULL(entry))
1587                 return entry ? PTR_ERR(entry) : -ENOMEM;
1588
1589         return 0;
1590 }
1591 EXPORT_SYMBOL_GPL(ldebugfs_register_stats);
1592
1593 int lprocfs_register_stats(struct proc_dir_entry *root, const char *name,
1594                            struct lprocfs_stats *stats)
1595 {
1596         struct proc_dir_entry *entry;
1597         LASSERT(root != NULL);
1598
1599         entry = proc_create_data(name, 0644, root,
1600                                  &lprocfs_stats_seq_fops, stats);
1601         if (entry == NULL)
1602                 return -ENOMEM;
1603         return 0;
1604 }
1605 EXPORT_SYMBOL(lprocfs_register_stats);
1606
1607 void lprocfs_counter_init(struct lprocfs_stats *stats, int index,
1608                           unsigned conf, const char *name, const char *units)
1609 {
1610         struct lprocfs_counter_header   *header;
1611         struct lprocfs_counter          *percpu_cntr;
1612         unsigned long                   flags = 0;
1613         unsigned int                    i;
1614         unsigned int                    num_cpu;
1615
1616         LASSERT(stats != NULL);
1617
1618         header = &stats->ls_cnt_header[index];
1619         LASSERTF(header != NULL, "Failed to allocate stats header:[%d]%s/%s\n",
1620                  index, name, units);
1621
1622         header->lc_config = conf;
1623         header->lc_name   = name;
1624         header->lc_units  = units;
1625
1626         num_cpu = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1627         for (i = 0; i < num_cpu; ++i) {
1628                 if (stats->ls_percpu[i] == NULL)
1629                         continue;
1630                 percpu_cntr = lprocfs_stats_counter_get(stats, i, index);
1631                 percpu_cntr->lc_count           = 0;
1632                 percpu_cntr->lc_min             = LC_MIN_INIT;
1633                 percpu_cntr->lc_max             = 0;
1634                 percpu_cntr->lc_sumsquare       = 0;
1635                 percpu_cntr->lc_sum             = 0;
1636                 if ((stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1637                         percpu_cntr->lc_sum_irq = 0;
1638         }
1639         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1640 }
1641 EXPORT_SYMBOL(lprocfs_counter_init);
1642
1643 /* Note that we only init md counters for ops whose offset is less
1644  * than NUM_MD_STATS. This is explained in a comment in the definition
1645  * of struct md_ops. */
1646 #define LPROCFS_MD_OP_INIT(base, stats, op)                                    \
1647         do {                                                                   \
1648                 unsigned int _idx = base + MD_COUNTER_OFFSET(op);              \
1649                                                                                \
1650                 if (MD_COUNTER_OFFSET(op) < NUM_MD_STATS) {                    \
1651                         LASSERT(_idx < stats->ls_num);                         \
1652                         lprocfs_counter_init(stats, _idx, 0, #op, "reqs");     \
1653                 }                                                              \
1654         } while (0)
1655
1656 void lprocfs_init_mps_stats(int num_private_stats, struct lprocfs_stats *stats)
1657 {
1658         LPROCFS_MD_OP_INIT(num_private_stats, stats, get_root);
1659         LPROCFS_MD_OP_INIT(num_private_stats, stats, null_inode);
1660         LPROCFS_MD_OP_INIT(num_private_stats, stats, close);
1661         LPROCFS_MD_OP_INIT(num_private_stats, stats, create);
1662         LPROCFS_MD_OP_INIT(num_private_stats, stats, enqueue);
1663         LPROCFS_MD_OP_INIT(num_private_stats, stats, getattr);
1664         LPROCFS_MD_OP_INIT(num_private_stats, stats, getattr_name);
1665         LPROCFS_MD_OP_INIT(num_private_stats, stats, intent_lock);
1666         LPROCFS_MD_OP_INIT(num_private_stats, stats, link);
1667         LPROCFS_MD_OP_INIT(num_private_stats, stats, rename);
1668         LPROCFS_MD_OP_INIT(num_private_stats, stats, setattr);
1669         LPROCFS_MD_OP_INIT(num_private_stats, stats, fsync);
1670         LPROCFS_MD_OP_INIT(num_private_stats, stats, read_page);
1671         LPROCFS_MD_OP_INIT(num_private_stats, stats, unlink);
1672         LPROCFS_MD_OP_INIT(num_private_stats, stats, setxattr);
1673         LPROCFS_MD_OP_INIT(num_private_stats, stats, getxattr);
1674         LPROCFS_MD_OP_INIT(num_private_stats, stats, init_ea_size);
1675         LPROCFS_MD_OP_INIT(num_private_stats, stats, get_lustre_md);
1676         LPROCFS_MD_OP_INIT(num_private_stats, stats, free_lustre_md);
1677         LPROCFS_MD_OP_INIT(num_private_stats, stats, merge_attr);
1678         LPROCFS_MD_OP_INIT(num_private_stats, stats, set_open_replay_data);
1679         LPROCFS_MD_OP_INIT(num_private_stats, stats, clear_open_replay_data);
1680         LPROCFS_MD_OP_INIT(num_private_stats, stats, set_lock_data);
1681         LPROCFS_MD_OP_INIT(num_private_stats, stats, lock_match);
1682         LPROCFS_MD_OP_INIT(num_private_stats, stats, cancel_unused);
1683         LPROCFS_MD_OP_INIT(num_private_stats, stats, intent_getattr_async);
1684         LPROCFS_MD_OP_INIT(num_private_stats, stats, revalidate_lock);
1685 }
1686
1687 int lprocfs_alloc_md_stats(struct obd_device *obd,
1688                            unsigned int num_private_stats)
1689 {
1690         struct lprocfs_stats *stats;
1691         unsigned int num_stats;
1692         int rc, i;
1693
1694         CLASSERT(offsetof(struct md_ops, MD_STATS_FIRST_OP) == 0);
1695         CLASSERT(_MD_COUNTER_OFFSET(MD_STATS_FIRST_OP) == 0);
1696         CLASSERT(_MD_COUNTER_OFFSET(MD_STATS_LAST_OP) > 0);
1697
1698         /* TODO Ensure that this function is only used where
1699          * appropriate by adding an assertion to the effect that
1700          * obd->obd_type->typ_md_ops is not NULL. We can't do this now
1701          * because mdt_procfs_init() uses this function to allocate
1702          * the stats backing /proc/fs/lustre/mdt/.../md_stats but the
1703          * mdt layer does not use the md_ops interface. This is
1704          * confusing and a waste of memory. See LU-2484.
1705          */
1706         LASSERT(obd->obd_proc_entry != NULL);
1707         LASSERT(obd->obd_md_stats == NULL);
1708         LASSERT(obd->obd_md_cntr_base == 0);
1709
1710         num_stats = NUM_MD_STATS + num_private_stats;
1711         stats = lprocfs_alloc_stats(num_stats, 0);
1712         if (stats == NULL)
1713                 return -ENOMEM;
1714
1715         lprocfs_init_mps_stats(num_private_stats, stats);
1716
1717         for (i = num_private_stats; i < num_stats; i++) {
1718                 if (stats->ls_cnt_header[i].lc_name == NULL) {
1719                         CERROR("Missing md_stat initializer md_op "
1720                                "operation at offset %d. Aborting.\n",
1721                                i - num_private_stats);
1722                         LBUG();
1723                 }
1724         }
1725
1726         rc = lprocfs_register_stats(obd->obd_proc_entry, "md_stats", stats);
1727         if (rc < 0) {
1728                 lprocfs_free_stats(&stats);
1729         } else {
1730                 obd->obd_md_stats = stats;
1731                 obd->obd_md_cntr_base = num_private_stats;
1732         }
1733
1734         return rc;
1735 }
1736 EXPORT_SYMBOL(lprocfs_alloc_md_stats);
1737
1738 void lprocfs_free_md_stats(struct obd_device *obd)
1739 {
1740         struct lprocfs_stats *stats = obd->obd_md_stats;
1741
1742         if (stats != NULL) {
1743                 obd->obd_md_stats = NULL;
1744                 obd->obd_md_cntr_base = 0;
1745                 lprocfs_free_stats(&stats);
1746         }
1747 }
1748 EXPORT_SYMBOL(lprocfs_free_md_stats);
1749
1750 void lprocfs_init_ldlm_stats(struct lprocfs_stats *ldlm_stats)
1751 {
1752         lprocfs_counter_init(ldlm_stats,
1753                              LDLM_ENQUEUE - LDLM_FIRST_OPC,
1754                              0, "ldlm_enqueue", "reqs");
1755         lprocfs_counter_init(ldlm_stats,
1756                              LDLM_CONVERT - LDLM_FIRST_OPC,
1757                              0, "ldlm_convert", "reqs");
1758         lprocfs_counter_init(ldlm_stats,
1759                              LDLM_CANCEL - LDLM_FIRST_OPC,
1760                              0, "ldlm_cancel", "reqs");
1761         lprocfs_counter_init(ldlm_stats,
1762                              LDLM_BL_CALLBACK - LDLM_FIRST_OPC,
1763                              0, "ldlm_bl_callback", "reqs");
1764         lprocfs_counter_init(ldlm_stats,
1765                              LDLM_CP_CALLBACK - LDLM_FIRST_OPC,
1766                              0, "ldlm_cp_callback", "reqs");
1767         lprocfs_counter_init(ldlm_stats,
1768                              LDLM_GL_CALLBACK - LDLM_FIRST_OPC,
1769                              0, "ldlm_gl_callback", "reqs");
1770 }
1771 EXPORT_SYMBOL(lprocfs_init_ldlm_stats);
1772
1773 __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
1774                           struct lprocfs_counter_header *header,
1775                           enum lprocfs_stats_flags flags,
1776                           enum lprocfs_fields_flags field)
1777 {
1778         __s64 ret = 0;
1779
1780         if (lc == NULL || header == NULL)
1781                 RETURN(0);
1782
1783         switch (field) {
1784                 case LPROCFS_FIELDS_FLAGS_CONFIG:
1785                         ret = header->lc_config;
1786                         break;
1787                 case LPROCFS_FIELDS_FLAGS_SUM:
1788                         ret = lc->lc_sum;
1789                         if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1790                                 ret += lc->lc_sum_irq;
1791                         break;
1792                 case LPROCFS_FIELDS_FLAGS_MIN:
1793                         ret = lc->lc_min;
1794                         break;
1795                 case LPROCFS_FIELDS_FLAGS_MAX:
1796                         ret = lc->lc_max;
1797                         break;
1798                 case LPROCFS_FIELDS_FLAGS_AVG:
1799                         ret = (lc->lc_max - lc->lc_min) / 2;
1800                         break;
1801                 case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
1802                         ret = lc->lc_sumsquare;
1803                         break;
1804                 case LPROCFS_FIELDS_FLAGS_COUNT:
1805                         ret = lc->lc_count;
1806                         break;
1807                 default:
1808                         break;
1809         };
1810         RETURN(ret);
1811 }
1812 EXPORT_SYMBOL(lprocfs_read_helper);
1813
1814 int lprocfs_read_frac_helper(char *buffer, unsigned long count, long val,
1815                              int mult)
1816 {
1817         long decimal_val, frac_val;
1818         int prtn;
1819
1820         if (count < 10)
1821                 return -EINVAL;
1822
1823         decimal_val = val / mult;
1824         prtn = snprintf(buffer, count, "%ld", decimal_val);
1825         frac_val = val % mult;
1826
1827         if (prtn < (count - 4) && frac_val > 0) {
1828                 long temp_frac;
1829                 int i, temp_mult = 1, frac_bits = 0;
1830
1831                 temp_frac = frac_val * 10;
1832                 buffer[prtn++] = '.';
1833                 while (frac_bits < 2 && (temp_frac / mult) < 1 ) {
1834                         /* only reserved 2 bits fraction */
1835                         buffer[prtn++] ='0';
1836                         temp_frac *= 10;
1837                         frac_bits++;
1838                 }
1839                 /*
1840                  * Need to think these cases :
1841                  *      1. #echo x.00 > /proc/xxx       output result : x
1842                  *      2. #echo x.0x > /proc/xxx       output result : x.0x
1843                  *      3. #echo x.x0 > /proc/xxx       output result : x.x
1844                  *      4. #echo x.xx > /proc/xxx       output result : x.xx
1845                  *      Only reserved 2 bits fraction.
1846                  */
1847                 for (i = 0; i < (5 - prtn); i++)
1848                         temp_mult *= 10;
1849
1850                 frac_bits = min((int)count - prtn, 3 - frac_bits);
1851                 prtn += snprintf(buffer + prtn, frac_bits, "%ld",
1852                                  frac_val * temp_mult / mult);
1853
1854                 prtn--;
1855                 while(buffer[prtn] < '1' || buffer[prtn] > '9') {
1856                         prtn--;
1857                         if (buffer[prtn] == '.') {
1858                                 prtn--;
1859                                 break;
1860                         }
1861                 }
1862                 prtn++;
1863         }
1864         buffer[prtn++] ='\n';
1865         return prtn;
1866 }
1867 EXPORT_SYMBOL(lprocfs_read_frac_helper);
1868
1869 int lprocfs_seq_read_frac_helper(struct seq_file *m, long val, int mult)
1870 {
1871         long decimal_val, frac_val;
1872
1873         decimal_val = val / mult;
1874         seq_printf(m, "%ld", decimal_val);
1875         frac_val = val % mult;
1876
1877         if (frac_val > 0) {
1878                 frac_val *= 100;
1879                 frac_val /= mult;
1880         }
1881         if (frac_val > 0) {
1882                 /* Three cases: x0, xx, 0x */
1883                 if ((frac_val % 10) != 0)
1884                         seq_printf(m, ".%ld", frac_val);
1885                 else
1886                         seq_printf(m, ".%ld", frac_val / 10);
1887         }
1888
1889         seq_printf(m, "\n");
1890         return 0;
1891 }
1892 EXPORT_SYMBOL(lprocfs_seq_read_frac_helper);
1893
1894 /* Obtains the conversion factor for the unit specified */
1895 static int get_mult(char unit, __u64 *mult)
1896 {
1897         __u64 units = 1;
1898
1899         switch (unit) {
1900         /* peta, tera, giga, mega, and kilo */
1901         case 'p':
1902         case 'P':
1903                 units <<= 10;
1904         case 't':
1905         case 'T':
1906                 units <<= 10;
1907         case 'g':
1908         case 'G':
1909                 units <<= 10;
1910         case 'm':
1911         case 'M':
1912                 units <<= 10;
1913         case 'k':
1914         case 'K':
1915                 units <<= 10;
1916                 break;
1917         /* some tests expect % to be accepted */
1918         case '%':
1919                 units = 1;
1920                 break;
1921         default:
1922                 return -EINVAL;
1923         }
1924
1925         *mult = units;
1926
1927         return 0;
1928 }
1929
1930 /*
1931  * Ensures the numeric string is valid. The function provides the final
1932  * multiplier in the case a unit exists at the end of the string. It also
1933  * locates the start of the whole and fractional parts (if any). This
1934  * function modifies the string so kstrtoull can be used to parse both
1935  * the whole and fraction portions. This function also figures out
1936  * the base of the number.
1937  */
1938 static int preprocess_numeric_str(char *buffer, __u64 *mult, __u64 def_mult,
1939                                   bool allow_units, char **whole, char **frac,
1940                                   unsigned int *base)
1941 {
1942         bool hit_decimal = false;
1943         bool hit_unit = false;
1944         int rc = 0;
1945         char *start;
1946         *mult = def_mult;
1947         *whole = NULL;
1948         *frac = NULL;
1949         *base = 10;
1950
1951         /* a hex string if it starts with "0x" */
1952         if (buffer[0] == '0' && tolower(buffer[1]) == 'x') {
1953                 *base = 16;
1954                 buffer += 2;
1955         }
1956
1957         start = buffer;
1958
1959         while (*buffer) {
1960                 /* allow for a single new line before the null terminator */
1961                 if (*buffer == '\n') {
1962                         *buffer = '\0';
1963                         buffer++;
1964
1965                         if (*buffer)
1966                                 return -EINVAL;
1967
1968                         break;
1969                 }
1970
1971                 /* any chars after our unit indicates a malformed string */
1972                 if (hit_unit)
1973                         return -EINVAL;
1974
1975                 /* ensure we only hit one decimal */
1976                 if (*buffer == '.') {
1977                         if (hit_decimal)
1978                                 return -EINVAL;
1979
1980                         /* if past start, there's a whole part */
1981                         if (start != buffer)
1982                                 *whole = start;
1983
1984                         *buffer = '\0';
1985                         start = buffer + 1;
1986                         hit_decimal = true;
1987                 } else if (!isdigit(*buffer) &&
1988                            !(*base == 16 && isxdigit(*buffer))) {
1989                         if (allow_units) {
1990                                 /* if we allow units, attempt to get mult */
1991                                 hit_unit = true;
1992                                 rc = get_mult(*buffer, mult);
1993                                 if (rc)
1994                                         return rc;
1995
1996                                 /* string stops here, but keep processing */
1997                                 *buffer = '\0';
1998                         } else {
1999                                 /* bad string */
2000                                 return -EINVAL;
2001                         }
2002                 }
2003
2004                 buffer++;
2005         }
2006
2007         if (hit_decimal) {
2008                 /* hit a decimal, make sure there's a fractional part */
2009                 if (!*start)
2010                         return -EINVAL;
2011
2012                 *frac = start;
2013         } else {
2014                 /* didn't hit a decimal, but may have a whole part */
2015                 if (start != buffer && *start)
2016                         *whole = start;
2017         }
2018
2019         /* malformed string if we didn't get anything */
2020         if (!*frac && !*whole)
2021                 return -EINVAL;
2022
2023         return 0;
2024 }
2025
2026 /*
2027  * Parses a numeric string which can contain a whole and fraction portion
2028  * into a __u64. Accepts a multiplier to apply to the value parsed. Also
2029  * allows the string to have a unit at the end. The function handles
2030  * wrapping of the final unsigned value.
2031  */
2032 static int str_to_u64_parse(char *buffer, unsigned long count,
2033                             __u64 *val, __u64 def_mult, bool allow_units)
2034 {
2035         __u64 whole = 0;
2036         __u64 frac = 0;
2037         unsigned int frac_d = 1;
2038         __u64 wrap_indicator = ULLONG_MAX;
2039         int rc = 0;
2040         __u64 mult;
2041         char *strwhole;
2042         char *strfrac;
2043         unsigned int base = 10;
2044
2045         rc = preprocess_numeric_str(buffer, &mult, def_mult, allow_units,
2046                                     &strwhole, &strfrac, &base);
2047
2048         if (rc)
2049                 return rc;
2050
2051         if (mult == 0) {
2052                 *val = 0;
2053                 return 0;
2054         }
2055
2056         /* the multiplier limits how large the value can be */
2057         wrap_indicator = div64_u64(wrap_indicator, mult);
2058
2059         if (strwhole) {
2060                 rc = kstrtoull(strwhole, base, &whole);
2061                 if (rc)
2062                         return rc;
2063
2064                 if (whole > wrap_indicator)
2065                         return -ERANGE;
2066
2067                 whole *= mult;
2068         }
2069
2070         if (strfrac) {
2071                 if (strlen(strfrac) > 10)
2072                         strfrac[10] = '\0';
2073
2074                 rc = kstrtoull(strfrac, base, &frac);
2075                 if (rc)
2076                         return rc;
2077
2078                 /* determine power of fractional portion */
2079                 while (*strfrac) {
2080                         frac_d *= base;
2081                         strfrac++;
2082                 }
2083
2084                 /* fractional portion is too large to perform calculation */
2085                 if (frac > wrap_indicator)
2086                         return -ERANGE;
2087
2088                 frac *= mult;
2089                 do_div(frac, frac_d);
2090         }
2091
2092         /* check that the sum of whole and fraction fits in u64 */
2093         if (whole > (ULLONG_MAX - frac))
2094                 return -ERANGE;
2095
2096         *val = whole + frac;
2097
2098         return 0;
2099 }
2100
2101 /*
2102  * This function parses numeric/hex strings into __s64. It accepts a multiplier
2103  * which will apply to the value parsed. It also can allow the string to
2104  * have a unit as the last character. The function handles overflow/underflow
2105  * of the signed integer.
2106  */
2107 static int str_to_s64_internal(const char __user *buffer, unsigned long count,
2108                                __s64 *val, __u64 def_mult, bool allow_units)
2109 {
2110         char kernbuf[22];
2111         __u64 tmp;
2112         unsigned int offset = 0;
2113         int signed sign = 1;
2114         __u64 max = LLONG_MAX;
2115         int rc = 0;
2116
2117         if (count > (sizeof(kernbuf) - 1))
2118                 return -EINVAL;
2119
2120         if (copy_from_user(kernbuf, buffer, count))
2121                 return -EFAULT;
2122
2123         kernbuf[count] = '\0';
2124
2125         /* keep track of our sign */
2126         if (*kernbuf == '-') {
2127                 sign = -1;
2128                 offset++;
2129                 /* equivalent to max = -LLONG_MIN, avoids overflow */
2130                 max++;
2131         }
2132
2133         rc = str_to_u64_parse(kernbuf + offset, count - offset,
2134                               &tmp, def_mult, allow_units);
2135         if (rc)
2136                 return rc;
2137
2138         /* check for overflow/underflow */
2139         if (max < tmp)
2140                 return -ERANGE;
2141
2142         *val = (__s64)tmp * sign;
2143
2144         return 0;
2145 }
2146
2147 /**
2148  * Convert a user string into a signed 64 bit number. This function produces
2149  * an error when the value parsed from the string times multiplier underflows or
2150  * overflows. This function only accepts strings that contains digits, an
2151  * optional decimal, and a char representing a unit at the end. If a unit is
2152  * specified in the string, the multiplier provided by the caller is ignored.
2153  * This function can also accept hexadecimal strings which are prefixed with
2154  * "0x".
2155  *
2156  * \param[in] buffer    string consisting of numbers, a decimal, and a unit
2157  * \param[in] count     buffer length
2158  * \param[in] val       if successful, the value represented by the string
2159  * \param[in] defunit   default unit if string doesn't contain one
2160  *
2161  * \retval              0 on success
2162  * \retval              negative number on error
2163  */
2164 int lprocfs_str_with_units_to_s64(const char __user *buffer,
2165                                   unsigned long count, __s64 *val, char defunit)
2166 {
2167         __u64 mult = 1;
2168         int rc;
2169
2170         if (defunit != '1') {
2171                 rc = get_mult(defunit, &mult);
2172                 if (rc)
2173                         return rc;
2174         }
2175
2176         return str_to_s64_internal(buffer, count, val, mult, true);
2177 }
2178 EXPORT_SYMBOL(lprocfs_str_with_units_to_s64);
2179
2180 char *lprocfs_strnstr(const char *s1, const char *s2, size_t len)
2181 {
2182         size_t l2;
2183
2184         l2 = strlen(s2);
2185         if (!l2)
2186                 return (char *)s1;
2187         while (len >= l2) {
2188                 len--;
2189                 if (!memcmp(s1, s2, l2))
2190                         return (char *)s1;
2191                 s1++;
2192         }
2193         return NULL;
2194 }
2195 EXPORT_SYMBOL(lprocfs_strnstr);
2196
2197 /**
2198  * Find the string \a name in the input \a buffer, and return a pointer to the
2199  * value immediately following \a name, reducing \a count appropriately.
2200  * If \a name is not found the original \a buffer is returned.
2201  */
2202 char *lprocfs_find_named_value(const char *buffer, const char *name,
2203                                 size_t *count)
2204 {
2205         char *val;
2206         size_t buflen = *count;
2207
2208         /* there is no strnstr() in rhel5 and ubuntu kernels */
2209         val = lprocfs_strnstr(buffer, name, buflen);
2210         if (val == NULL)
2211                 return (char *)buffer;
2212
2213         val += strlen(name);                             /* skip prefix */
2214         while (val < buffer + buflen && isspace(*val)) /* skip separator */
2215                 val++;
2216
2217         *count = 0;
2218         while (val < buffer + buflen && isalnum(*val)) {
2219                 ++*count;
2220                 ++val;
2221         }
2222
2223         return val - *count;
2224 }
2225 EXPORT_SYMBOL(lprocfs_find_named_value);
2226
2227 int ldebugfs_seq_create(struct dentry *parent, const char *name, umode_t mode,
2228                         const struct file_operations *seq_fops, void *data)
2229 {
2230         struct dentry *entry;
2231
2232         /* Disallow secretly (un)writable entries. */
2233         LASSERT((!seq_fops->write) == (!(mode & 0222)));
2234
2235         entry = debugfs_create_file(name, mode, parent, data, seq_fops);
2236         if (IS_ERR_OR_NULL(entry))
2237                 return entry ? PTR_ERR(entry) : -ENOMEM;
2238
2239         return 0;
2240 }
2241 EXPORT_SYMBOL_GPL(ldebugfs_seq_create);
2242
2243 int lprocfs_seq_create(struct proc_dir_entry *parent,
2244                        const char *name,
2245                        mode_t mode,
2246                        const struct file_operations *seq_fops,
2247                        void *data)
2248 {
2249         struct proc_dir_entry *entry;
2250         ENTRY;
2251
2252         /* Disallow secretly (un)writable entries. */
2253         LASSERT((seq_fops->write == NULL) == ((mode & 0222) == 0));
2254
2255         entry = proc_create_data(name, mode, parent, seq_fops, data);
2256
2257         if (entry == NULL)
2258                 RETURN(-ENOMEM);
2259
2260         RETURN(0);
2261 }
2262 EXPORT_SYMBOL(lprocfs_seq_create);
2263
2264 int lprocfs_obd_seq_create(struct obd_device *dev,
2265                            const char *name,
2266                            mode_t mode,
2267                            const struct file_operations *seq_fops,
2268                            void *data)
2269 {
2270         return (lprocfs_seq_create(dev->obd_proc_entry, name,
2271                                    mode, seq_fops, data));
2272 }
2273 EXPORT_SYMBOL(lprocfs_obd_seq_create);
2274
2275 void lprocfs_oh_tally(struct obd_histogram *oh, unsigned int value)
2276 {
2277         if (value >= OBD_HIST_MAX)
2278                 value = OBD_HIST_MAX - 1;
2279
2280         spin_lock(&oh->oh_lock);
2281         oh->oh_buckets[value]++;
2282         spin_unlock(&oh->oh_lock);
2283 }
2284 EXPORT_SYMBOL(lprocfs_oh_tally);
2285
2286 void lprocfs_oh_tally_log2(struct obd_histogram *oh, unsigned int value)
2287 {
2288         unsigned int val = 0;
2289
2290         if (likely(value != 0))
2291                 val = min(fls(value - 1), OBD_HIST_MAX);
2292
2293         lprocfs_oh_tally(oh, val);
2294 }
2295 EXPORT_SYMBOL(lprocfs_oh_tally_log2);
2296
2297 unsigned long lprocfs_oh_sum(struct obd_histogram *oh)
2298 {
2299         unsigned long ret = 0;
2300         int i;
2301
2302         for (i = 0; i < OBD_HIST_MAX; i++)
2303                 ret +=  oh->oh_buckets[i];
2304         return ret;
2305 }
2306 EXPORT_SYMBOL(lprocfs_oh_sum);
2307
2308 void lprocfs_oh_clear(struct obd_histogram *oh)
2309 {
2310         spin_lock(&oh->oh_lock);
2311         memset(oh->oh_buckets, 0, sizeof(oh->oh_buckets));
2312         spin_unlock(&oh->oh_lock);
2313 }
2314 EXPORT_SYMBOL(lprocfs_oh_clear);
2315
2316 ssize_t lustre_attr_show(struct kobject *kobj,
2317                          struct attribute *attr, char *buf)
2318 {
2319         struct lustre_attr *a = container_of(attr, struct lustre_attr, attr);
2320
2321         return a->show ? a->show(kobj, attr, buf) : 0;
2322 }
2323 EXPORT_SYMBOL_GPL(lustre_attr_show);
2324
2325 ssize_t lustre_attr_store(struct kobject *kobj, struct attribute *attr,
2326                           const char *buf, size_t len)
2327 {
2328         struct lustre_attr *a = container_of(attr, struct lustre_attr, attr);
2329
2330         return a->store ? a->store(kobj, attr, buf, len) : len;
2331 }
2332 EXPORT_SYMBOL_GPL(lustre_attr_store);
2333
2334 const struct sysfs_ops lustre_sysfs_ops = {
2335         .show  = lustre_attr_show,
2336         .store = lustre_attr_store,
2337 };
2338 EXPORT_SYMBOL_GPL(lustre_sysfs_ops);
2339
2340 int lprocfs_obd_max_pages_per_rpc_seq_show(struct seq_file *m, void *data)
2341 {
2342         struct obd_device *dev = data;
2343         struct client_obd *cli = &dev->u.cli;
2344
2345         spin_lock(&cli->cl_loi_list_lock);
2346         seq_printf(m, "%d\n", cli->cl_max_pages_per_rpc);
2347         spin_unlock(&cli->cl_loi_list_lock);
2348         return 0;
2349 }
2350 EXPORT_SYMBOL(lprocfs_obd_max_pages_per_rpc_seq_show);
2351
2352 ssize_t lprocfs_obd_max_pages_per_rpc_seq_write(struct file *file,
2353                                                 const char __user *buffer,
2354                                                 size_t count, loff_t *off)
2355 {
2356         struct obd_device *dev =
2357                 ((struct seq_file *)file->private_data)->private;
2358         struct client_obd *cli = &dev->u.cli;
2359         struct obd_connect_data *ocd = &cli->cl_import->imp_connect_data;
2360         int chunk_mask, rc;
2361         s64 val;
2362
2363         rc = lprocfs_str_with_units_to_s64(buffer, count, &val, '1');
2364         if (rc)
2365                 return rc;
2366         if (val < 0)
2367                 return -ERANGE;
2368
2369         /* if the max_pages is specified in bytes, convert to pages */
2370         if (val >= ONE_MB_BRW_SIZE)
2371                 val >>= PAGE_SHIFT;
2372
2373         LPROCFS_CLIMP_CHECK(dev);
2374
2375         chunk_mask = ~((1 << (cli->cl_chunkbits - PAGE_SHIFT)) - 1);
2376         /* max_pages_per_rpc must be chunk aligned */
2377         val = (val + ~chunk_mask) & chunk_mask;
2378         if (val == 0 || (ocd->ocd_brw_size != 0 &&
2379                          val > ocd->ocd_brw_size >> PAGE_SHIFT)) {
2380                 LPROCFS_CLIMP_EXIT(dev);
2381                 return -ERANGE;
2382         }
2383         spin_lock(&cli->cl_loi_list_lock);
2384         cli->cl_max_pages_per_rpc = val;
2385         client_adjust_max_dirty(cli);
2386         spin_unlock(&cli->cl_loi_list_lock);
2387
2388         LPROCFS_CLIMP_EXIT(dev);
2389         return count;
2390 }
2391 EXPORT_SYMBOL(lprocfs_obd_max_pages_per_rpc_seq_write);
2392
2393 ssize_t short_io_bytes_show(struct kobject *kobj, struct attribute *attr,
2394                             char *buf)
2395 {
2396         struct obd_device *dev = container_of(kobj, struct obd_device,
2397                                               obd_kset.kobj);
2398         struct client_obd *cli = &dev->u.cli;
2399         int rc;
2400
2401         spin_lock(&cli->cl_loi_list_lock);
2402         rc = sprintf(buf, "%d\n", cli->cl_short_io_bytes);
2403         spin_unlock(&cli->cl_loi_list_lock);
2404         return rc;
2405 }
2406 EXPORT_SYMBOL(short_io_bytes_show);
2407
2408 /* Used to catch people who think they're specifying pages. */
2409 #define MIN_SHORT_IO_BYTES 64
2410
2411 ssize_t short_io_bytes_store(struct kobject *kobj, struct attribute *attr,
2412                              const char *buffer, size_t count)
2413 {
2414         struct obd_device *dev = container_of(kobj, struct obd_device,
2415                                               obd_kset.kobj);
2416         struct client_obd *cli = &dev->u.cli;
2417         u32 val;
2418         int rc;
2419
2420         LPROCFS_CLIMP_CHECK(dev);
2421
2422         rc = kstrtouint(buffer, 0, &val);
2423         if (rc)
2424                 GOTO(out, rc);
2425
2426         if (val < MIN_SHORT_IO_BYTES || val > OBD_MAX_SHORT_IO_BYTES)
2427                 GOTO(out, rc = -ERANGE);
2428
2429         rc = count;
2430
2431         spin_lock(&cli->cl_loi_list_lock);
2432         if (val > (cli->cl_max_pages_per_rpc << PAGE_SHIFT))
2433                 rc = -ERANGE;
2434         else
2435                 cli->cl_short_io_bytes = val;
2436         spin_unlock(&cli->cl_loi_list_lock);
2437
2438 out:
2439         LPROCFS_CLIMP_EXIT(dev);
2440         return rc;
2441 }
2442 EXPORT_SYMBOL(short_io_bytes_store);
2443
2444 int lprocfs_wr_root_squash(const char __user *buffer, unsigned long count,
2445                            struct root_squash_info *squash, char *name)
2446 {
2447         int rc;
2448         char kernbuf[64], *tmp, *errmsg;
2449         unsigned long uid, gid;
2450         ENTRY;
2451
2452         if (count >= sizeof(kernbuf)) {
2453                 errmsg = "string too long";
2454                 GOTO(failed_noprint, rc = -EINVAL);
2455         }
2456         if (copy_from_user(kernbuf, buffer, count)) {
2457                 errmsg = "bad address";
2458                 GOTO(failed_noprint, rc = -EFAULT);
2459         }
2460         kernbuf[count] = '\0';
2461
2462         /* look for uid gid separator */
2463         tmp = strchr(kernbuf, ':');
2464         if (tmp == NULL) {
2465                 errmsg = "needs uid:gid format";
2466                 GOTO(failed, rc = -EINVAL);
2467         }
2468         *tmp = '\0';
2469         tmp++;
2470
2471         /* parse uid */
2472         if (kstrtoul(kernbuf, 0, &uid) != 0) {
2473                 errmsg = "bad uid";
2474                 GOTO(failed, rc = -EINVAL);
2475         }
2476
2477         /* parse gid */
2478         if (kstrtoul(tmp, 0, &gid) != 0) {
2479                 errmsg = "bad gid";
2480                 GOTO(failed, rc = -EINVAL);
2481         }
2482
2483         squash->rsi_uid = uid;
2484         squash->rsi_gid = gid;
2485
2486         LCONSOLE_INFO("%s: root_squash is set to %u:%u\n",
2487                       name, squash->rsi_uid, squash->rsi_gid);
2488         RETURN(count);
2489
2490 failed:
2491         if (tmp != NULL) {
2492                 tmp--;
2493                 *tmp = ':';
2494         }
2495         CWARN("%s: failed to set root_squash to \"%s\", %s, rc = %d\n",
2496               name, kernbuf, errmsg, rc);
2497         RETURN(rc);
2498 failed_noprint:
2499         CWARN("%s: failed to set root_squash due to %s, rc = %d\n",
2500               name, errmsg, rc);
2501         RETURN(rc);
2502 }
2503 EXPORT_SYMBOL(lprocfs_wr_root_squash);
2504
2505
2506 int lprocfs_wr_nosquash_nids(const char __user *buffer, unsigned long count,
2507                              struct root_squash_info *squash, char *name)
2508 {
2509         int rc;
2510         char *kernbuf = NULL;
2511         char *errmsg;
2512         struct list_head tmp;
2513         int len = count;
2514         ENTRY;
2515
2516         if (count > 4096) {
2517                 errmsg = "string too long";
2518                 GOTO(failed, rc = -EINVAL);
2519         }
2520
2521         OBD_ALLOC(kernbuf, count + 1);
2522         if (kernbuf == NULL) {
2523                 errmsg = "no memory";
2524                 GOTO(failed, rc = -ENOMEM);
2525         }
2526         if (copy_from_user(kernbuf, buffer, count)) {
2527                 errmsg = "bad address";
2528                 GOTO(failed, rc = -EFAULT);
2529         }
2530         kernbuf[count] = '\0';
2531
2532         if (count > 0 && kernbuf[count - 1] == '\n')
2533                 len = count - 1;
2534
2535         if ((len == 4 && strncmp(kernbuf, "NONE", len) == 0) ||
2536             (len == 5 && strncmp(kernbuf, "clear", len) == 0)) {
2537                 /* empty string is special case */
2538                 down_write(&squash->rsi_sem);
2539                 if (!list_empty(&squash->rsi_nosquash_nids))
2540                         cfs_free_nidlist(&squash->rsi_nosquash_nids);
2541                 up_write(&squash->rsi_sem);
2542                 LCONSOLE_INFO("%s: nosquash_nids is cleared\n", name);
2543                 OBD_FREE(kernbuf, count + 1);
2544                 RETURN(count);
2545         }
2546
2547         INIT_LIST_HEAD(&tmp);
2548         if (cfs_parse_nidlist(kernbuf, count, &tmp) <= 0) {
2549                 errmsg = "can't parse";
2550                 GOTO(failed, rc = -EINVAL);
2551         }
2552         LCONSOLE_INFO("%s: nosquash_nids set to %s\n",
2553                       name, kernbuf);
2554         OBD_FREE(kernbuf, count + 1);
2555         kernbuf = NULL;
2556
2557         down_write(&squash->rsi_sem);
2558         if (!list_empty(&squash->rsi_nosquash_nids))
2559                 cfs_free_nidlist(&squash->rsi_nosquash_nids);
2560         list_splice(&tmp, &squash->rsi_nosquash_nids);
2561         up_write(&squash->rsi_sem);
2562
2563         RETURN(count);
2564
2565 failed:
2566         if (kernbuf) {
2567                 CWARN("%s: failed to set nosquash_nids to \"%s\", %s rc = %d\n",
2568                       name, kernbuf, errmsg, rc);
2569                 OBD_FREE(kernbuf, count + 1);
2570         } else {
2571                 CWARN("%s: failed to set nosquash_nids due to %s rc = %d\n",
2572                       name, errmsg, rc);
2573         }
2574         RETURN(rc);
2575 }
2576 EXPORT_SYMBOL(lprocfs_wr_nosquash_nids);
2577
2578 #endif /* CONFIG_PROC_FS*/