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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2015, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/obdclass/lprocfs_status.c
  37  *
  38  * Author: Hariharan Thantry <thantry@users.sourceforge.net>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_CLASS
  42
  43 #include <obd_class.h>
  44 #include <lprocfs_status.h>
  45 #include <lustre/lustre_idl.h>
  46
  47 #ifdef CONFIG_PROC_FS
  48
  49 static int lprocfs_no_percpu_stats = 0;
  50 CFS_MODULE_PARM(lprocfs_no_percpu_stats, "i", int, 0644,
  51                 "Do not alloc percpu data for lprocfs stats");
  52
  53 #define MAX_STRING_SIZE 128
  54
  55 int lprocfs_single_release(struct inode *inode, struct file *file)
  56 {
  57         return single_release(inode, file);
  58 }
  59 EXPORT_SYMBOL(lprocfs_single_release);
  60
  61 int lprocfs_seq_release(struct inode *inode, struct file *file)
  62 {
  63         return seq_release(inode, file);
  64 }
  65 EXPORT_SYMBOL(lprocfs_seq_release);
  66
  67 struct proc_dir_entry *
  68 lprocfs_add_simple(struct proc_dir_entry *root, char *name,
  69                    void *data, const struct file_operations *fops)
  70 {
  71         struct proc_dir_entry *proc;
  72         mode_t mode = 0;
  73
  74         if (root == NULL || name == NULL || fops == NULL)
  75                 return ERR_PTR(-EINVAL);
  76
  77         if (fops->read)
  78                 mode = 0444;
  79         if (fops->write)
  80                 mode |= 0200;
  81         proc = proc_create_data(name, mode, root, fops, data);
  82         if (!proc) {
  83                 CERROR("LprocFS: No memory to create /proc entry %s\n",
  84                        name);
  85                 return ERR_PTR(-ENOMEM);
  86         }
  87         return proc;
  88 }
  89 EXPORT_SYMBOL(lprocfs_add_simple);
  90
  91 struct proc_dir_entry *lprocfs_add_symlink(const char *name,
  92                         struct proc_dir_entry *parent, const char *format, ...)
  93 {
  94         struct proc_dir_entry *entry;
  95         char *dest;
  96         va_list ap;
  97
  98         if (parent == NULL || format == NULL)
  99                 return NULL;
 100
 101         OBD_ALLOC_WAIT(dest, MAX_STRING_SIZE + 1);
 102         if (dest == NULL)
 103                 return NULL;
 104
 105         va_start(ap, format);
 106         vsnprintf(dest, MAX_STRING_SIZE, format, ap);
 107         va_end(ap);
 108
 109         entry = proc_symlink(name, parent, dest);
 110         if (entry == NULL)
 111                 CERROR("LprocFS: Could not create symbolic link from "
 112                        "%s to %s\n", name, dest);
 113
 114         OBD_FREE(dest, MAX_STRING_SIZE + 1);
 115         return entry;
 116 }
 117 EXPORT_SYMBOL(lprocfs_add_symlink);
 118
 119 static const struct file_operations lprocfs_generic_fops = { };
 120
 121 /**
 122  * Add /proc entries.
 123  *
 124  * \param root [in]  The parent proc entry on which new entry will be added.
 125  * \param list [in]  Array of proc entries to be added.
 126  * \param data [in]  The argument to be passed when entries read/write routines
 127  *                   are called through /proc file.
 128  *
 129  * \retval 0   on success
 130  *         < 0 on error
 131  */
 132 int
 133 lprocfs_add_vars(struct proc_dir_entry *root, struct lprocfs_vars *list,
 134                  void *data)
 135 {
 136         if (root == NULL || list == NULL)
 137                 return -EINVAL;
 138
 139         while (list->name != NULL) {
 140                 struct proc_dir_entry *proc;
 141                 mode_t mode = 0;
 142
 143                 if (list->proc_mode != 0000) {
 144                         mode = list->proc_mode;
 145                 } else if (list->fops) {
 146                         if (list->fops->read)
 147                                 mode = 0444;
 148                         if (list->fops->write)
 149                                 mode |= 0200;
 150                 }
 151                 proc = proc_create_data(list->name, mode, root,
 152                                         list->fops ?: &lprocfs_generic_fops,
 153                                         list->data ?: data);
 154                 if (proc == NULL)
 155                         return -ENOMEM;
 156                 list++;
 157         }
 158         return 0;
 159 }
 160 EXPORT_SYMBOL(lprocfs_add_vars);
 161
 162 #ifndef HAVE_REMOVE_PROC_SUBTREE
 163 /* for b=10866, global variable */
 164 DECLARE_RWSEM(_lprocfs_lock);
 165 EXPORT_SYMBOL(_lprocfs_lock);
 166
 167 static void lprocfs_remove_nolock(struct proc_dir_entry **proot)
 168 {
 169         struct proc_dir_entry *root = *proot;
 170         struct proc_dir_entry *temp = root;
 171         struct proc_dir_entry *rm_entry;
 172         struct proc_dir_entry *parent;
 173
 174         *proot = NULL;
 175         if (root == NULL || IS_ERR(root))
 176                 return;
 177
 178         parent = root->parent;
 179         LASSERT(parent != NULL);
 180
 181         while (1) {
 182                 while (temp->subdir != NULL)
 183                         temp = temp->subdir;
 184
 185                 rm_entry = temp;
 186                 temp = temp->parent;
 187
 188                 /* Memory corruption once caused this to fail, and
 189                    without this LASSERT we would loop here forever. */
 190                 LASSERTF(strlen(rm_entry->name) == rm_entry->namelen,
 191                          "0x%p  %s/%s len %d\n", rm_entry, temp->name,
 192                          rm_entry->name, (int)strlen(rm_entry->name));
 193
 194                 remove_proc_entry(rm_entry->name, temp);
 195                 if (temp == parent)
 196                         break;
 197         }
 198 }
 199
 200 int remove_proc_subtree(const char *name, struct proc_dir_entry *parent)
 201 {
 202         struct proc_dir_entry    *t = NULL;
 203         struct proc_dir_entry   **p;
 204         int                       len, busy = 0;
 205
 206         LASSERT(parent != NULL);
 207         len = strlen(name);
 208
 209         down_write(&_lprocfs_lock);
 210         /* lookup target name */
 211         for (p = &parent->subdir; *p; p = &(*p)->next) {
 212                 if ((*p)->namelen != len)
 213                         continue;
 214                 if (memcmp(name, (*p)->name, len))
 215                         continue;
 216                 t = *p;
 217                 break;
 218         }
 219
 220         if (t) {
 221                 /* verify it's empty: do not count "num_refs" */
 222                 for (p = &t->subdir; *p; p = &(*p)->next) {
 223                         if ((*p)->namelen != strlen("num_refs")) {
 224                                 busy = 1;
 225                                 break;
 226                         }
 227                         if (memcmp("num_refs", (*p)->name,
 228                                    strlen("num_refs"))) {
 229                                 busy = 1;
 230                                 break;
 231                         }
 232                 }
 233         }
 234
 235         if (busy == 0)
 236                 lprocfs_remove_nolock(&t);
 237
 238         up_write(&_lprocfs_lock);
 239         return 0;
 240 }
 241 #endif /* !HAVE_REMOVE_PROC_SUBTREE */
 242
 243 #ifndef HAVE_PROC_REMOVE
 244 void proc_remove(struct proc_dir_entry *de)
 245 {
 246 #ifndef HAVE_REMOVE_PROC_SUBTREE
 247         down_write(&_lprocfs_lock); /* search vs remove race */
 248         lprocfs_remove_nolock(&de);
 249         up_write(&_lprocfs_lock);
 250 #else
 251         if (de)
 252                 remove_proc_subtree(de->name, de->parent);
 253 #endif
 254 }
 255 #endif
 256
 257 void lprocfs_remove(struct proc_dir_entry **rooth)
 258 {
 259         proc_remove(*rooth);
 260         *rooth = NULL;
 261 }
 262 EXPORT_SYMBOL(lprocfs_remove);
 263
 264 void lprocfs_remove_proc_entry(const char *name, struct proc_dir_entry *parent)
 265 {
 266         LASSERT(parent != NULL);
 267         remove_proc_entry(name, parent);
 268 }
 269 EXPORT_SYMBOL(lprocfs_remove_proc_entry);
 270
 271 struct proc_dir_entry *
 272 lprocfs_register(const char *name, struct proc_dir_entry *parent,
 273                  struct lprocfs_vars *list, void *data)
 274 {
 275         struct proc_dir_entry *newchild;
 276
 277         newchild = proc_mkdir(name, parent);
 278         if (newchild == NULL)
 279                 return ERR_PTR(-ENOMEM);
 280
 281         if (list != NULL) {
 282                 int rc = lprocfs_add_vars(newchild, list, data);
 283                 if (rc) {
 284                         lprocfs_remove(&newchild);
 285                         return ERR_PTR(rc);
 286                 }
 287         }
 288         return newchild;
 289 }
 290 EXPORT_SYMBOL(lprocfs_register);
 291
 292 /* Generic callbacks */
 293 int lprocfs_uint_seq_show(struct seq_file *m, void *data)
 294 {
 295         return seq_printf(m, "%u\n", *(unsigned int *)data);
 296 }
 297 EXPORT_SYMBOL(lprocfs_uint_seq_show);
 298
 299 int lprocfs_wr_uint(struct file *file, const char __user *buffer,
 300                     unsigned long count, void *data)
 301 {
 302         unsigned *p = data;
 303         char dummy[MAX_STRING_SIZE + 1], *end;
 304         unsigned long tmp;
 305
 306         dummy[MAX_STRING_SIZE] = '\0';
 307         if (copy_from_user(dummy, buffer, MAX_STRING_SIZE))
 308                 return -EFAULT;
 309
 310         tmp = simple_strtoul(dummy, &end, 0);
 311         if (dummy == end)
 312                 return -EINVAL;
 313
 314         *p = (unsigned int)tmp;
 315         return count;
 316 }
 317 EXPORT_SYMBOL(lprocfs_wr_uint);
 318
 319 ssize_t lprocfs_uint_seq_write(struct file *file, const char __user *buffer,
 320                                size_t count, loff_t *off)
 321 {
 322         int *data = ((struct seq_file *)file->private_data)->private;
 323         int val = 0, rc;
 324
 325         rc = lprocfs_write_helper(buffer, count, &val);
 326         if (rc < 0)
 327                 return rc;
 328
 329         return lprocfs_wr_uint(file, buffer, count, data);
 330 }
 331 EXPORT_SYMBOL(lprocfs_uint_seq_write);
 332
 333 int lprocfs_u64_seq_show(struct seq_file *m, void *data)
 334 {
 335         LASSERT(data != NULL);
 336         return seq_printf(m, LPU64"\n", *(__u64 *)data);
 337 }
 338 EXPORT_SYMBOL(lprocfs_u64_seq_show);
 339
 340 int lprocfs_atomic_seq_show(struct seq_file *m, void *data)
 341 {
 342         atomic_t *atom = data;
 343         LASSERT(atom != NULL);
 344         return seq_printf(m, "%d\n", atomic_read(atom));
 345 }
 346 EXPORT_SYMBOL(lprocfs_atomic_seq_show);
 347
 348 ssize_t
 349 lprocfs_atomic_seq_write(struct file *file, const char __user *buffer,
 350                         size_t count, loff_t *off)
 351 {
 352         atomic_t *atm = ((struct seq_file *)file->private_data)->private;
 353         int val = 0;
 354         int rc;
 355
 356         rc = lprocfs_write_helper(buffer, count, &val);
 357         if (rc < 0)
 358                 return rc;
 359
 360         if (val <= 0)
 361                 return -ERANGE;
 362
 363         atomic_set(atm, val);
 364         return count;
 365 }
 366 EXPORT_SYMBOL(lprocfs_atomic_seq_write);
 367
 368 int lprocfs_uuid_seq_show(struct seq_file *m, void *data)
 369 {
 370         struct obd_device *obd = data;
 371
 372         LASSERT(obd != NULL);
 373         return seq_printf(m, "%s\n", obd->obd_uuid.uuid);
 374 }
 375 EXPORT_SYMBOL(lprocfs_uuid_seq_show);
 376
 377 int lprocfs_name_seq_show(struct seq_file *m, void *data)
 378 {
 379         struct obd_device *dev = data;
 380
 381         LASSERT(dev != NULL);
 382         return seq_printf(m, "%s\n", dev->obd_name);
 383 }
 384 EXPORT_SYMBOL(lprocfs_name_seq_show);
 385
 386 int lprocfs_blksize_seq_show(struct seq_file *m, void *data)
 387 {
 388         struct obd_device *obd = data;
 389         struct obd_statfs  osfs;
 390         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 391                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 392                             OBD_STATFS_NODELAY);
 393         if (!rc)
 394                 rc = seq_printf(m, "%u\n", osfs.os_bsize);
 395         return rc;
 396 }
 397 EXPORT_SYMBOL(lprocfs_blksize_seq_show);
 398
 399 int lprocfs_kbytestotal_seq_show(struct seq_file *m, void *data)
 400 {
 401         struct obd_device *obd = data;
 402         struct obd_statfs  osfs;
 403         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 404                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 405                             OBD_STATFS_NODELAY);
 406         if (!rc) {
 407                 __u32 blk_size = osfs.os_bsize >> 10;
 408                 __u64 result = osfs.os_blocks;
 409
 410                 while (blk_size >>= 1)
 411                         result <<= 1;
 412
 413                 rc = seq_printf(m, LPU64"\n", result);
 414         }
 415         return rc;
 416 }
 417 EXPORT_SYMBOL(lprocfs_kbytestotal_seq_show);
 418
 419 int lprocfs_kbytesfree_seq_show(struct seq_file *m, void *data)
 420 {
 421         struct obd_device *obd = data;
 422         struct obd_statfs  osfs;
 423         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 424                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 425                             OBD_STATFS_NODELAY);
 426         if (!rc) {
 427                 __u32 blk_size = osfs.os_bsize >> 10;
 428                 __u64 result = osfs.os_bfree;
 429
 430                 while (blk_size >>= 1)
 431                         result <<= 1;
 432
 433                 rc = seq_printf(m, LPU64"\n", result);
 434         }
 435         return rc;
 436 }
 437 EXPORT_SYMBOL(lprocfs_kbytesfree_seq_show);
 438
 439 int lprocfs_kbytesavail_seq_show(struct seq_file *m, void *data)
 440 {
 441         struct obd_device *obd = data;
 442         struct obd_statfs  osfs;
 443         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 444                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 445                             OBD_STATFS_NODELAY);
 446         if (!rc) {
 447                 __u32 blk_size = osfs.os_bsize >> 10;
 448                 __u64 result = osfs.os_bavail;
 449
 450                 while (blk_size >>= 1)
 451                         result <<= 1;
 452
 453                 rc = seq_printf(m, LPU64"\n", result);
 454         }
 455         return rc;
 456 }
 457 EXPORT_SYMBOL(lprocfs_kbytesavail_seq_show);
 458
 459 int lprocfs_filestotal_seq_show(struct seq_file *m, void *data)
 460 {
 461         struct obd_device *obd = data;
 462         struct obd_statfs  osfs;
 463         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 464                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 465                             OBD_STATFS_NODELAY);
 466         if (!rc)
 467                 rc = seq_printf(m, LPU64"\n", osfs.os_files);
 468         return rc;
 469 }
 470 EXPORT_SYMBOL(lprocfs_filestotal_seq_show);
 471
 472 int lprocfs_filesfree_seq_show(struct seq_file *m, void *data)
 473 {
 474         struct obd_device *obd = data;
 475         struct obd_statfs  osfs;
 476         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 477                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 478                             OBD_STATFS_NODELAY);
 479         if (!rc)
 480                 rc = seq_printf(m, LPU64"\n", osfs.os_ffree);
 481         return rc;
 482 }
 483 EXPORT_SYMBOL(lprocfs_filesfree_seq_show);
 484
 485 int lprocfs_server_uuid_seq_show(struct seq_file *m, void *data)
 486 {
 487         struct obd_device *obd = data;
 488         struct obd_import *imp;
 489         char *imp_state_name = NULL;
 490         int rc = 0;
 491
 492         LASSERT(obd != NULL);
 493         LPROCFS_CLIMP_CHECK(obd);
 494         imp = obd->u.cli.cl_import;
 495         imp_state_name = ptlrpc_import_state_name(imp->imp_state);
 496         rc = seq_printf(m, "%s\t%s%s\n", obd2cli_tgt(obd), imp_state_name,
 497                         imp->imp_deactive ? "\tDEACTIVATED" : "");
 498
 499         LPROCFS_CLIMP_EXIT(obd);
 500         return rc;
 501 }
 502 EXPORT_SYMBOL(lprocfs_server_uuid_seq_show);
 503
 504 int lprocfs_conn_uuid_seq_show(struct seq_file *m, void *data)
 505 {
 506         struct obd_device *obd = data;
 507         struct ptlrpc_connection *conn;
 508         int rc = 0;
 509
 510         LASSERT(obd != NULL);
 511
 512         LPROCFS_CLIMP_CHECK(obd);
 513         conn = obd->u.cli.cl_import->imp_connection;
 514         if (conn && obd->u.cli.cl_import)
 515                 rc = seq_printf(m, "%s\n", conn->c_remote_uuid.uuid);
 516         else
 517                 rc = seq_printf(m, "%s\n", "<none>");
 518
 519         LPROCFS_CLIMP_EXIT(obd);
 520         return rc;
 521 }
 522 EXPORT_SYMBOL(lprocfs_conn_uuid_seq_show);
 523
 524 /** add up per-cpu counters */
 525 void lprocfs_stats_collect(struct lprocfs_stats *stats, int idx,
 526                            struct lprocfs_counter *cnt)
 527 {
 528         unsigned int                    num_entry;
 529         struct lprocfs_counter          *percpu_cntr;
 530         int                             i;
 531         unsigned long                   flags = 0;
 532
 533         memset(cnt, 0, sizeof(*cnt));
 534
 535         if (stats == NULL) {
 536                 /* set count to 1 to avoid divide-by-zero errs in callers */
 537                 cnt->lc_count = 1;
 538                 return;
 539         }
 540
 541         cnt->lc_min = LC_MIN_INIT;
 542
 543         num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
 544
 545         for (i = 0; i < num_entry; i++) {
 546                 if (stats->ls_percpu[i] == NULL)
 547                         continue;
 548                 percpu_cntr = lprocfs_stats_counter_get(stats, i, idx);
 549
 550                 cnt->lc_count += percpu_cntr->lc_count;
 551                 cnt->lc_sum += percpu_cntr->lc_sum;
 552                 if (percpu_cntr->lc_min < cnt->lc_min)
 553                         cnt->lc_min = percpu_cntr->lc_min;
 554                 if (percpu_cntr->lc_max > cnt->lc_max)
 555                         cnt->lc_max = percpu_cntr->lc_max;
 556                 cnt->lc_sumsquare += percpu_cntr->lc_sumsquare;
 557         }
 558
 559         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
 560 }
 561
 562 /**
 563  * Append a space separated list of current set flags to str.
 564  */
 565 #define flag2str(flag)                                          \
 566         do {                                                            \
 567                 if (imp->imp_##flag) {                                  \
 568                         seq_printf(m, "%s" #flag, first ? "" : ", ");   \
 569                         first = false;                                  \
 570                 }                                                       \
 571         } while (0)
 572 static void obd_import_flags2str(struct obd_import *imp, struct seq_file *m)
 573 {
 574         bool first = true;
 575
 576         if (imp->imp_obd->obd_no_recov) {
 577                 seq_printf(m, "no_recov");
 578                 first = false;
 579         }
 580
 581         flag2str(invalid);
 582         flag2str(deactive);
 583         flag2str(replayable);
 584         flag2str(delayed_recovery);
 585         flag2str(no_lock_replay);
 586         flag2str(vbr_failed);
 587         flag2str(pingable);
 588         flag2str(resend_replay);
 589         flag2str(no_pinger_recover);
 590         flag2str(need_mne_swab);
 591         flag2str(connect_tried);
 592 }
 593 #undef flag2str
 594
 595 static const char *obd_connect_names[] = {
 596         "read_only",
 597         "lov_index",
 598         "connect_from_mds",
 599         "write_grant",
 600         "server_lock",
 601         "version",
 602         "request_portal",
 603         "acl",
 604         "xattr",
 605         "create_on_write",
 606         "truncate_lock",
 607         "initial_transno",
 608         "inode_bit_locks",
 609         "join_file(obsolete)",
 610         "getattr_by_fid",
 611         "no_oh_for_devices",
 612         "remote_client",
 613         "remote_client_by_force",
 614         "max_byte_per_rpc",
 615         "64bit_qdata",
 616         "mds_capability",
 617         "oss_capability",
 618         "early_lock_cancel",
 619         "som",
 620         "adaptive_timeouts",
 621         "lru_resize",
 622         "mds_mds_connection",
 623         "real_conn",
 624         "change_qunit_size",
 625         "alt_checksum_algorithm",
 626         "fid_is_enabled",
 627         "version_recovery",
 628         "pools",
 629         "grant_shrink",
 630         "skip_orphan",
 631         "large_ea",
 632         "full20",
 633         "layout_lock",
 634         "64bithash",
 635         "object_max_bytes",
 636         "imp_recov",
 637         "jobstats",
 638         "umask",
 639         "einprogress",
 640         "grant_param",
 641         "flock_owner",
 642         "lvb_type",
 643         "nanoseconds_times",
 644         "lightweight_conn",
 645         "short_io",
 646         "pingless",
 647         "flock_deadlock",
 648         "disp_stripe",
 649         "open_by_fid",
 650         "lfsck",
 651         "unknown",
 652         "unlink_close",
 653         "multi_mod_rpcs",
 654         "dir_stripe",
 655         "fileset_mount",
 656         "lock_ahead",
 657         "bulk_mbits",
 658         "compact_obdo",
 659         "second_flags",
 660         NULL
 661 };
 662
 663 static void obd_connect_seq_flags2str(struct seq_file *m, __u64 flags, char *sep)
 664 {
 665         bool first = true;
 666         __u64 mask = 1;
 667         int i;
 668
 669         for (i = 0; obd_connect_names[i] != NULL; i++, mask <<= 1) {
 670                 if (flags & mask) {
 671                         seq_printf(m, "%s%s",
 672                                    first ? "" : sep, obd_connect_names[i]);
 673                         first = false;
 674                 }
 675         }
 676         if (flags & ~(mask - 1))
 677                 seq_printf(m, "%sunknown_"LPX64,
 678                            first ? "" : sep, flags & ~(mask - 1));
 679 }
 680
 681 int obd_connect_flags2str(char *page, int count, __u64 flags, char *sep)
 682 {
 683         __u64 mask = 1;
 684         int i, ret = 0;
 685
 686         for (i = 0; obd_connect_names[i] != NULL; i++, mask <<= 1) {
 687                 if (flags & mask)
 688                         ret += snprintf(page + ret, count - ret, "%s%s",
 689                                         ret ? sep : "", obd_connect_names[i]);
 690         }
 691         if (flags & ~(mask - 1))
 692                 ret += snprintf(page + ret, count - ret,
 693                                 "%sunknown_"LPX64,
 694                                 ret ? sep : "", flags & ~(mask - 1));
 695         return ret;
 696 }
 697 EXPORT_SYMBOL(obd_connect_flags2str);
 698
 699 static void obd_connect_data_seqprint(struct seq_file *m,
 700                                       struct obd_connect_data *ocd)
 701 {
 702         __u64 flags;
 703
 704         LASSERT(ocd != NULL);
 705         flags = ocd->ocd_connect_flags;
 706
 707         seq_printf(m, "    connect_data:\n"
 708                       "       flags: "LPX64"\n"
 709                       "       instance: %u\n",
 710                       ocd->ocd_connect_flags,
 711                       ocd->ocd_instance);
 712         if (flags & OBD_CONNECT_VERSION)
 713                 seq_printf(m, "       target_version: %u.%u.%u.%u\n",
 714                               OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 715                               OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 716                               OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 717                               OBD_OCD_VERSION_FIX(ocd->ocd_version));
 718         if (flags & OBD_CONNECT_MDS)
 719                 seq_printf(m, "       mdt_index: %d\n", ocd->ocd_group);
 720         if (flags & OBD_CONNECT_GRANT)
 721                 seq_printf(m, "       initial_grant: %d\n", ocd->ocd_grant);
 722         if (flags & OBD_CONNECT_INDEX)
 723                 seq_printf(m, "       target_index: %u\n", ocd->ocd_index);
 724         if (flags & OBD_CONNECT_BRW_SIZE)
 725                 seq_printf(m, "       max_brw_size: %d\n", ocd->ocd_brw_size);
 726         if (flags & OBD_CONNECT_IBITS)
 727                 seq_printf(m, "       ibits_known: "LPX64"\n",
 728                                 ocd->ocd_ibits_known);
 729         if (flags & OBD_CONNECT_GRANT_PARAM)
 730                 seq_printf(m, "       grant_block_size: %d\n"
 731                               "       grant_inode_size: %d\n"
 732                               "       grant_extent_overhead: %d\n",
 733                               ocd->ocd_blocksize,
 734                               ocd->ocd_inodespace,
 735                               ocd->ocd_grant_extent);
 736         if (flags & OBD_CONNECT_TRANSNO)
 737                 seq_printf(m, "       first_transno: "LPX64"\n",
 738                                 ocd->ocd_transno);
 739         if (flags & OBD_CONNECT_CKSUM)
 740                 seq_printf(m, "       cksum_types: %#x\n",
 741                               ocd->ocd_cksum_types);
 742         if (flags & OBD_CONNECT_MAX_EASIZE)
 743                 seq_printf(m, "       max_easize: %d\n", ocd->ocd_max_easize);
 744         if (flags & OBD_CONNECT_MAXBYTES)
 745                 seq_printf(m, "       max_object_bytes: "LPU64"\n",
 746                               ocd->ocd_maxbytes);
 747         if (flags & OBD_CONNECT_MULTIMODRPCS)
 748                 seq_printf(m, "       max_mod_rpcs: %hu\n",
 749                               ocd->ocd_maxmodrpcs);
 750 }
 751
 752 int lprocfs_import_seq_show(struct seq_file *m, void *data)
 753 {
 754         char                            nidstr[LNET_NIDSTR_SIZE];
 755         struct lprocfs_counter          ret;
 756         struct lprocfs_counter_header   *header;
 757         struct obd_device               *obd    = (struct obd_device *)data;
 758         struct obd_import               *imp;
 759         struct obd_import_conn          *conn;
 760         struct obd_connect_data         *ocd;
 761         int                             j;
 762         int                             k;
 763         int                             rw      = 0;
 764
 765         LASSERT(obd != NULL);
 766         LPROCFS_CLIMP_CHECK(obd);
 767         imp = obd->u.cli.cl_import;
 768         ocd = &imp->imp_connect_data;
 769
 770         seq_printf(m, "import:\n"
 771                       "    name: %s\n"
 772                       "    target: %s\n"
 773                       "    state: %s\n"
 774                       "    connect_flags: [ ",
 775                       obd->obd_name,
 776                       obd2cli_tgt(obd),
 777                       ptlrpc_import_state_name(imp->imp_state));
 778         obd_connect_seq_flags2str(m, imp->imp_connect_data.ocd_connect_flags,
 779                                         ", ");
 780         seq_printf(m, " ]\n");
 781         obd_connect_data_seqprint(m, ocd);
 782         seq_printf(m, "    import_flags: [ ");
 783         obd_import_flags2str(imp, m);
 784
 785         seq_printf(m, " ]\n"
 786                       "    connection:\n"
 787                       "       failover_nids: [ ");
 788         spin_lock(&imp->imp_lock);
 789         j = 0;
 790         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 791                 libcfs_nid2str_r(conn->oic_conn->c_peer.nid,
 792                                  nidstr, sizeof(nidstr));
 793                 seq_printf(m, "%s%s", j ? ", " : "", nidstr);
 794                 j++;
 795         }
 796         if (imp->imp_connection != NULL)
 797                 libcfs_nid2str_r(imp->imp_connection->c_peer.nid,
 798                                  nidstr, sizeof(nidstr));
 799         else
 800                 strncpy(nidstr, "<none>", sizeof(nidstr));
 801         seq_printf(m, " ]\n"
 802                       "       current_connection: %s\n"
 803                       "       connection_attempts: %u\n"
 804                       "       generation: %u\n"
 805                       "       in-progress_invalidations: %u\n",
 806                       nidstr,
 807                       imp->imp_conn_cnt,
 808                       imp->imp_generation,
 809                       atomic_read(&imp->imp_inval_count));
 810         spin_unlock(&imp->imp_lock);
 811
 812         if (obd->obd_svc_stats == NULL)
 813                 goto out_climp;
 814
 815         header = &obd->obd_svc_stats->ls_cnt_header[PTLRPC_REQWAIT_CNTR];
 816         lprocfs_stats_collect(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR, &ret);
 817         if (ret.lc_count != 0) {
 818                 /* first argument to do_div MUST be __u64 */
 819                 __u64 sum = ret.lc_sum;
 820                 do_div(sum, ret.lc_count);
 821                 ret.lc_sum = sum;
 822         } else
 823                 ret.lc_sum = 0;
 824         seq_printf(m, "    rpcs:\n"
 825                       "       inflight: %u\n"
 826                       "       unregistering: %u\n"
 827                       "       timeouts: %u\n"
 828                       "       avg_waittime: "LPU64" %s\n",
 829                       atomic_read(&imp->imp_inflight),
 830                       atomic_read(&imp->imp_unregistering),
 831                       atomic_read(&imp->imp_timeouts),
 832                       ret.lc_sum, header->lc_units);
 833
 834         k = 0;
 835         for(j = 0; j < IMP_AT_MAX_PORTALS; j++) {
 836                 if (imp->imp_at.iat_portal[j] == 0)
 837                         break;
 838                 k = max_t(unsigned int, k,
 839                           at_get(&imp->imp_at.iat_service_estimate[j]));
 840         }
 841         seq_printf(m, "    service_estimates:\n"
 842                       "       services: %u sec\n"
 843                       "       network: %u sec\n",
 844                       k,
 845                       at_get(&imp->imp_at.iat_net_latency));
 846
 847         seq_printf(m, "    transactions:\n"
 848                       "       last_replay: "LPU64"\n"
 849                       "       peer_committed: "LPU64"\n"
 850                       "       last_checked: "LPU64"\n",
 851                       imp->imp_last_replay_transno,
 852                       imp->imp_peer_committed_transno,
 853                       imp->imp_last_transno_checked);
 854
 855         /* avg data rates */
 856         for (rw = 0; rw <= 1; rw++) {
 857                 lprocfs_stats_collect(obd->obd_svc_stats,
 858                                       PTLRPC_LAST_CNTR + BRW_READ_BYTES + rw,
 859                                       &ret);
 860                 if (ret.lc_sum > 0 && ret.lc_count > 0) {
 861                         /* first argument to do_div MUST be __u64 */
 862                         __u64 sum = ret.lc_sum;
 863                         do_div(sum, ret.lc_count);
 864                         ret.lc_sum = sum;
 865                         seq_printf(m, "    %s_data_averages:\n"
 866                                       "       bytes_per_rpc: "LPU64"\n",
 867                                       rw ? "write" : "read",
 868                                       ret.lc_sum);
 869                 }
 870                 k = (int)ret.lc_sum;
 871                 j = opcode_offset(OST_READ + rw) + EXTRA_MAX_OPCODES;
 872                 header = &obd->obd_svc_stats->ls_cnt_header[j];
 873                 lprocfs_stats_collect(obd->obd_svc_stats, j, &ret);
 874                 if (ret.lc_sum > 0 && ret.lc_count != 0) {
 875                         /* first argument to do_div MUST be __u64 */
 876                         __u64 sum = ret.lc_sum;
 877                         do_div(sum, ret.lc_count);
 878                         ret.lc_sum = sum;
 879                         seq_printf(m, "       %s_per_rpc: "LPU64"\n",
 880                                         header->lc_units, ret.lc_sum);
 881                         j = (int)ret.lc_sum;
 882                         if (j > 0)
 883                                 seq_printf(m, "       MB_per_sec: %u.%.02u\n",
 884                                                 k / j, (100 * k / j) % 100);
 885                 }
 886         }
 887
 888 out_climp:
 889         LPROCFS_CLIMP_EXIT(obd);
 890         return 0;
 891 }
 892 EXPORT_SYMBOL(lprocfs_import_seq_show);
 893
 894 int lprocfs_state_seq_show(struct seq_file *m, void *data)
 895 {
 896         struct obd_device *obd = (struct obd_device *)data;
 897         struct obd_import *imp;
 898         int j, k;
 899
 900         LASSERT(obd != NULL);
 901         LPROCFS_CLIMP_CHECK(obd);
 902         imp = obd->u.cli.cl_import;
 903
 904         seq_printf(m, "current_state: %s\n",
 905                    ptlrpc_import_state_name(imp->imp_state));
 906         seq_printf(m, "state_history:\n");
 907         k = imp->imp_state_hist_idx;
 908         for (j = 0; j < IMP_STATE_HIST_LEN; j++) {
 909                 struct import_state_hist *ish =
 910                         &imp->imp_state_hist[(k + j) % IMP_STATE_HIST_LEN];
 911                 if (ish->ish_state == 0)
 912                         continue;
 913                 seq_printf(m, " - [ "CFS_TIME_T", %s ]\n",
 914                            ish->ish_time,
 915                 ptlrpc_import_state_name(ish->ish_state));
 916         }
 917
 918         LPROCFS_CLIMP_EXIT(obd);
 919         return 0;
 920 }
 921 EXPORT_SYMBOL(lprocfs_state_seq_show);
 922
 923 int lprocfs_at_hist_helper(struct seq_file *m, struct adaptive_timeout *at)
 924 {
 925         int i;
 926         for (i = 0; i < AT_BINS; i++)
 927                 seq_printf(m, "%3u ", at->at_hist[i]);
 928         seq_printf(m, "\n");
 929         return 0;
 930 }
 931 EXPORT_SYMBOL(lprocfs_at_hist_helper);
 932
 933 /* See also ptlrpc_lprocfs_timeouts_show_seq */
 934 int lprocfs_timeouts_seq_show(struct seq_file *m, void *data)
 935 {
 936         struct obd_device *obd = (struct obd_device *)data;
 937         struct obd_import *imp;
 938         unsigned int cur, worst;
 939         time_t now, worstt;
 940         struct dhms ts;
 941         int i;
 942
 943         LASSERT(obd != NULL);
 944         LPROCFS_CLIMP_CHECK(obd);
 945         imp = obd->u.cli.cl_import;
 946
 947         now = cfs_time_current_sec();
 948
 949         /* Some network health info for kicks */
 950         s2dhms(&ts, now - imp->imp_last_reply_time);
 951         seq_printf(m, "%-10s : %ld, "DHMS_FMT" ago\n",
 952                    "last reply", imp->imp_last_reply_time, DHMS_VARS(&ts));
 953
 954         cur = at_get(&imp->imp_at.iat_net_latency);
 955         worst = imp->imp_at.iat_net_latency.at_worst_ever;
 956         worstt = imp->imp_at.iat_net_latency.at_worst_time;
 957         s2dhms(&ts, now - worstt);
 958         seq_printf(m, "%-10s : cur %3u  worst %3u (at %ld, "DHMS_FMT" ago) ",
 959                    "network", cur, worst, worstt, DHMS_VARS(&ts));
 960         lprocfs_at_hist_helper(m, &imp->imp_at.iat_net_latency);
 961
 962         for(i = 0; i < IMP_AT_MAX_PORTALS; i++) {
 963                 if (imp->imp_at.iat_portal[i] == 0)
 964                         break;
 965                 cur = at_get(&imp->imp_at.iat_service_estimate[i]);
 966                 worst = imp->imp_at.iat_service_estimate[i].at_worst_ever;
 967                 worstt = imp->imp_at.iat_service_estimate[i].at_worst_time;
 968                 s2dhms(&ts, now - worstt);
 969                 seq_printf(m, "portal %-2d  : cur %3u  worst %3u (at %ld, "
 970                            DHMS_FMT" ago) ", imp->imp_at.iat_portal[i],
 971                            cur, worst, worstt, DHMS_VARS(&ts));
 972                 lprocfs_at_hist_helper(m, &imp->imp_at.iat_service_estimate[i]);
 973         }
 974
 975         LPROCFS_CLIMP_EXIT(obd);
 976         return 0;
 977 }
 978 EXPORT_SYMBOL(lprocfs_timeouts_seq_show);
 979
 980 int lprocfs_connect_flags_seq_show(struct seq_file *m, void *data)
 981 {
 982         struct obd_device *obd = data;
 983         __u64 flags;
 984
 985         LPROCFS_CLIMP_CHECK(obd);
 986         flags = obd->u.cli.cl_import->imp_connect_data.ocd_connect_flags;
 987         seq_printf(m, "flags="LPX64"\n", flags);
 988         obd_connect_seq_flags2str(m, flags, "\n");
 989         seq_printf(m, "\n");
 990         LPROCFS_CLIMP_EXIT(obd);
 991         return 0;
 992 }
 993 EXPORT_SYMBOL(lprocfs_connect_flags_seq_show);
 994
 995 int
 996 lprocfs_obd_setup(struct obd_device *obd)
 997 {
 998         int rc = 0;
 999
1000         LASSERT(obd != NULL);
1001         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1002         LASSERT(obd->obd_type->typ_procroot != NULL);
1003
1004         obd->obd_proc_entry = lprocfs_register(obd->obd_name,
1005                                                obd->obd_type->typ_procroot,
1006                                                obd->obd_vars, obd);
1007         if (IS_ERR(obd->obd_proc_entry)) {
1008                 rc = PTR_ERR(obd->obd_proc_entry);
1009                 CERROR("error %d setting up lprocfs for %s\n",rc,obd->obd_name);
1010                 obd->obd_proc_entry = NULL;
1011         }
1012         return rc;
1013 }
1014 EXPORT_SYMBOL(lprocfs_obd_setup);
1015
1016 int lprocfs_obd_cleanup(struct obd_device *obd)
1017 {
1018         if (!obd)
1019                 return -EINVAL;
1020         if (obd->obd_proc_exports_entry) {
1021                 /* Should be no exports left */
1022                 lprocfs_remove(&obd->obd_proc_exports_entry);
1023                 obd->obd_proc_exports_entry = NULL;
1024         }
1025         if (obd->obd_proc_entry) {
1026                 lprocfs_remove(&obd->obd_proc_entry);
1027                 obd->obd_proc_entry = NULL;
1028         }
1029         return 0;
1030 }
1031 EXPORT_SYMBOL(lprocfs_obd_cleanup);
1032
1033 int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int cpuid)
1034 {
1035         struct lprocfs_counter  *cntr;
1036         unsigned int            percpusize;
1037         int                     rc = -ENOMEM;
1038         unsigned long           flags = 0;
1039         int                     i;
1040
1041         LASSERT(stats->ls_percpu[cpuid] == NULL);
1042         LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);
1043
1044         percpusize = lprocfs_stats_counter_size(stats);
1045         LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[cpuid], percpusize);
1046         if (stats->ls_percpu[cpuid] != NULL) {
1047                 rc = 0;
1048                 if (unlikely(stats->ls_biggest_alloc_num <= cpuid)) {
1049                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1050                                 spin_lock_irqsave(&stats->ls_lock, flags);
1051                         else
1052                                 spin_lock(&stats->ls_lock);
1053                         if (stats->ls_biggest_alloc_num <= cpuid)
1054                                 stats->ls_biggest_alloc_num = cpuid + 1;
1055                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) {
1056                                 spin_unlock_irqrestore(&stats->ls_lock, flags);
1057                         } else {
1058                                 spin_unlock(&stats->ls_lock);
1059                         }
1060                 }
1061                 /* initialize the ls_percpu[cpuid] non-zero counter */
1062                 for (i = 0; i < stats->ls_num; ++i) {
1063                         cntr = lprocfs_stats_counter_get(stats, cpuid, i);
1064                         cntr->lc_min = LC_MIN_INIT;
1065                 }
1066         }
1067         return rc;
1068 }
1069 EXPORT_SYMBOL(lprocfs_stats_alloc_one);
1070
1071 struct lprocfs_stats *lprocfs_alloc_stats(unsigned int num,
1072                                           enum lprocfs_stats_flags flags)
1073 {
1074         struct lprocfs_stats    *stats;
1075         unsigned int            num_entry;
1076         unsigned int            percpusize = 0;
1077         int                     i;
1078
1079         if (num == 0)
1080                 return NULL;
1081
1082         if (lprocfs_no_percpu_stats != 0)
1083                 flags |= LPROCFS_STATS_FLAG_NOPERCPU;
1084
1085         if (flags & LPROCFS_STATS_FLAG_NOPERCPU)
1086                 num_entry = 1;
1087         else
1088                 num_entry = num_possible_cpus();
1089
1090         /* alloc percpu pointers for all possible cpu slots */
1091         LIBCFS_ALLOC(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1092         if (stats == NULL)
1093                 return NULL;
1094
1095         stats->ls_num = num;
1096         stats->ls_flags = flags;
1097         spin_lock_init(&stats->ls_lock);
1098
1099         /* alloc num of counter headers */
1100         LIBCFS_ALLOC(stats->ls_cnt_header,
1101                      stats->ls_num * sizeof(struct lprocfs_counter_header));
1102         if (stats->ls_cnt_header == NULL)
1103                 goto fail;
1104
1105         if ((flags & LPROCFS_STATS_FLAG_NOPERCPU) != 0) {
1106                 /* contains only one set counters */
1107                 percpusize = lprocfs_stats_counter_size(stats);
1108                 LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[0], percpusize);
1109                 if (stats->ls_percpu[0] == NULL)
1110                         goto fail;
1111                 stats->ls_biggest_alloc_num = 1;
1112         } else if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0) {
1113                 /* alloc all percpu data, currently only obd_memory use this */
1114                 for (i = 0; i < num_entry; ++i)
1115                         if (lprocfs_stats_alloc_one(stats, i) < 0)
1116                                 goto fail;
1117         }
1118
1119         return stats;
1120
1121 fail:
1122         lprocfs_free_stats(&stats);
1123         return NULL;
1124 }
1125 EXPORT_SYMBOL(lprocfs_alloc_stats);
1126
1127 void lprocfs_free_stats(struct lprocfs_stats **statsh)
1128 {
1129         struct lprocfs_stats *stats = *statsh;
1130         unsigned int num_entry;
1131         unsigned int percpusize;
1132         unsigned int i;
1133
1134         if (stats == NULL || stats->ls_num == 0)
1135                 return;
1136         *statsh = NULL;
1137
1138         if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU)
1139                 num_entry = 1;
1140         else
1141                 num_entry = num_possible_cpus();
1142
1143         percpusize = lprocfs_stats_counter_size(stats);
1144         for (i = 0; i < num_entry; i++)
1145                 if (stats->ls_percpu[i] != NULL)
1146                         LIBCFS_FREE(stats->ls_percpu[i], percpusize);
1147         if (stats->ls_cnt_header != NULL)
1148                 LIBCFS_FREE(stats->ls_cnt_header, stats->ls_num *
1149                                         sizeof(struct lprocfs_counter_header));
1150         LIBCFS_FREE(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1151 }
1152 EXPORT_SYMBOL(lprocfs_free_stats);
1153
1154 void lprocfs_clear_stats(struct lprocfs_stats *stats)
1155 {
1156         struct lprocfs_counter          *percpu_cntr;
1157         int                             i;
1158         int                             j;
1159         unsigned int                    num_entry;
1160         unsigned long                   flags = 0;
1161
1162         num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1163
1164         for (i = 0; i < num_entry; i++) {
1165                 if (stats->ls_percpu[i] == NULL)
1166                         continue;
1167                 for (j = 0; j < stats->ls_num; j++) {
1168                         percpu_cntr = lprocfs_stats_counter_get(stats, i, j);
1169                         percpu_cntr->lc_count           = 0;
1170                         percpu_cntr->lc_min             = LC_MIN_INIT;
1171                         percpu_cntr->lc_max             = 0;
1172                         percpu_cntr->lc_sumsquare       = 0;
1173                         percpu_cntr->lc_sum             = 0;
1174                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1175                                 percpu_cntr->lc_sum_irq = 0;
1176                 }
1177         }
1178
1179         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1180 }
1181 EXPORT_SYMBOL(lprocfs_clear_stats);
1182
1183 static ssize_t lprocfs_stats_seq_write(struct file *file,
1184                                        const char __user *buf,
1185                                        size_t len, loff_t *off)
1186 {
1187         struct seq_file *seq = file->private_data;
1188         struct lprocfs_stats *stats = seq->private;
1189
1190         lprocfs_clear_stats(stats);
1191
1192         return len;
1193 }
1194
1195 static void *lprocfs_stats_seq_start(struct seq_file *p, loff_t *pos)
1196 {
1197         struct lprocfs_stats *stats = p->private;
1198
1199         return (*pos < stats->ls_num) ? pos : NULL;
1200 }
1201
1202 static void lprocfs_stats_seq_stop(struct seq_file *p, void *v)
1203 {
1204 }
1205
1206 static void *lprocfs_stats_seq_next(struct seq_file *p, void *v, loff_t *pos)
1207 {
1208         (*pos)++;
1209
1210         return lprocfs_stats_seq_start(p, pos);
1211 }
1212
1213 /* seq file export of one lprocfs counter */
1214 static int lprocfs_stats_seq_show(struct seq_file *p, void *v)
1215 {
1216         struct lprocfs_stats            *stats  = p->private;
1217         struct lprocfs_counter_header   *hdr;
1218         struct lprocfs_counter           ctr;
1219         int                              idx    = *(loff_t *)v;
1220         int                              rc     = 0;
1221
1222         if (idx == 0) {
1223                 struct timeval now;
1224
1225                 do_gettimeofday(&now);
1226                 rc = seq_printf(p, "%-25s %lu.%lu secs.usecs\n",
1227                                 "snapshot_time", now.tv_sec, now.tv_usec);
1228                 if (rc < 0)
1229                         return rc;
1230         }
1231
1232         hdr = &stats->ls_cnt_header[idx];
1233         lprocfs_stats_collect(stats, idx, &ctr);
1234
1235         if (ctr.lc_count == 0)
1236                 goto out;
1237
1238         rc = seq_printf(p, "%-25s "LPD64" samples [%s]", hdr->lc_name,
1239                         ctr.lc_count, hdr->lc_units);
1240         if (rc < 0)
1241                 goto out;
1242
1243         if ((hdr->lc_config & LPROCFS_CNTR_AVGMINMAX) && ctr.lc_count > 0) {
1244                 rc = seq_printf(p, " "LPD64" "LPD64" "LPD64,
1245                                 ctr.lc_min, ctr.lc_max, ctr.lc_sum);
1246                 if (rc < 0)
1247                         goto out;
1248                 if (hdr->lc_config & LPROCFS_CNTR_STDDEV)
1249                         rc = seq_printf(p, " "LPD64, ctr.lc_sumsquare);
1250                 if (rc < 0)
1251                         goto out;
1252         }
1253         rc = seq_printf(p, "\n");
1254 out:
1255         return (rc < 0) ? rc : 0;
1256 }
1257
1258 static const struct seq_operations lprocfs_stats_seq_sops = {
1259         .start  = lprocfs_stats_seq_start,
1260         .stop   = lprocfs_stats_seq_stop,
1261         .next   = lprocfs_stats_seq_next,
1262         .show   = lprocfs_stats_seq_show,
1263 };
1264
1265 static int lprocfs_stats_seq_open(struct inode *inode, struct file *file)
1266 {
1267         struct seq_file *seq;
1268         int rc;
1269
1270         rc = LPROCFS_ENTRY_CHECK(inode);
1271         if (rc < 0)
1272                 return rc;
1273
1274         rc = seq_open(file, &lprocfs_stats_seq_sops);
1275         if (rc)
1276                 return rc;
1277         seq = file->private_data;
1278         seq->private = PDE_DATA(inode);
1279         return 0;
1280 }
1281
1282 static const struct file_operations lprocfs_stats_seq_fops = {
1283         .owner   = THIS_MODULE,
1284         .open    = lprocfs_stats_seq_open,
1285         .read    = seq_read,
1286         .write   = lprocfs_stats_seq_write,
1287         .llseek  = seq_lseek,
1288         .release = lprocfs_seq_release,
1289 };
1290
1291 int lprocfs_register_stats(struct proc_dir_entry *root, const char *name,
1292                            struct lprocfs_stats *stats)
1293 {
1294         struct proc_dir_entry *entry;
1295         LASSERT(root != NULL);
1296
1297         entry = proc_create_data(name, 0644, root,
1298                                  &lprocfs_stats_seq_fops, stats);
1299         if (entry == NULL)
1300                 return -ENOMEM;
1301         return 0;
1302 }
1303 EXPORT_SYMBOL(lprocfs_register_stats);
1304
1305 void lprocfs_counter_init(struct lprocfs_stats *stats, int index,
1306                           unsigned conf, const char *name, const char *units)
1307 {
1308         struct lprocfs_counter_header   *header;
1309         struct lprocfs_counter          *percpu_cntr;
1310         unsigned long                   flags = 0;
1311         unsigned int                    i;
1312         unsigned int                    num_cpu;
1313
1314         LASSERT(stats != NULL);
1315
1316         header = &stats->ls_cnt_header[index];
1317         LASSERTF(header != NULL, "Failed to allocate stats header:[%d]%s/%s\n",
1318                  index, name, units);
1319
1320         header->lc_config = conf;
1321         header->lc_name   = name;
1322         header->lc_units  = units;
1323
1324         num_cpu = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1325         for (i = 0; i < num_cpu; ++i) {
1326                 if (stats->ls_percpu[i] == NULL)
1327                         continue;
1328                 percpu_cntr = lprocfs_stats_counter_get(stats, i, index);
1329                 percpu_cntr->lc_count           = 0;
1330                 percpu_cntr->lc_min             = LC_MIN_INIT;
1331                 percpu_cntr->lc_max             = 0;
1332                 percpu_cntr->lc_sumsquare       = 0;
1333                 percpu_cntr->lc_sum             = 0;
1334                 if ((stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1335                         percpu_cntr->lc_sum_irq = 0;
1336         }
1337         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1338 }
1339 EXPORT_SYMBOL(lprocfs_counter_init);
1340
1341 /* Note that we only init md counters for ops whose offset is less
1342  * than NUM_MD_STATS. This is explained in a comment in the definition
1343  * of struct md_ops. */
1344 #define LPROCFS_MD_OP_INIT(base, stats, op)                                    \
1345         do {                                                                   \
1346                 unsigned int _idx = base + MD_COUNTER_OFFSET(op);              \
1347                                                                                \
1348                 if (MD_COUNTER_OFFSET(op) < NUM_MD_STATS) {                    \
1349                         LASSERT(_idx < stats->ls_num);                         \
1350                         lprocfs_counter_init(stats, _idx, 0, #op, "reqs");     \
1351                 }                                                              \
1352         } while (0)
1353
1354 void lprocfs_init_mps_stats(int num_private_stats, struct lprocfs_stats *stats)
1355 {
1356         LPROCFS_MD_OP_INIT(num_private_stats, stats, getstatus);
1357         LPROCFS_MD_OP_INIT(num_private_stats, stats, null_inode);
1358         LPROCFS_MD_OP_INIT(num_private_stats, stats, find_cbdata);
1359         LPROCFS_MD_OP_INIT(num_private_stats, stats, close);
1360         LPROCFS_MD_OP_INIT(num_private_stats, stats, create);
1361         LPROCFS_MD_OP_INIT(num_private_stats, stats, enqueue);
1362         LPROCFS_MD_OP_INIT(num_private_stats, stats, getattr);
1363         LPROCFS_MD_OP_INIT(num_private_stats, stats, getattr_name);
1364         LPROCFS_MD_OP_INIT(num_private_stats, stats, intent_lock);
1365         LPROCFS_MD_OP_INIT(num_private_stats, stats, link);
1366         LPROCFS_MD_OP_INIT(num_private_stats, stats, rename);
1367         LPROCFS_MD_OP_INIT(num_private_stats, stats, setattr);
1368         LPROCFS_MD_OP_INIT(num_private_stats, stats, fsync);
1369         LPROCFS_MD_OP_INIT(num_private_stats, stats, read_page);
1370         LPROCFS_MD_OP_INIT(num_private_stats, stats, unlink);
1371         LPROCFS_MD_OP_INIT(num_private_stats, stats, setxattr);
1372         LPROCFS_MD_OP_INIT(num_private_stats, stats, getxattr);
1373         LPROCFS_MD_OP_INIT(num_private_stats, stats, init_ea_size);
1374         LPROCFS_MD_OP_INIT(num_private_stats, stats, get_lustre_md);
1375         LPROCFS_MD_OP_INIT(num_private_stats, stats, free_lustre_md);
1376         LPROCFS_MD_OP_INIT(num_private_stats, stats, merge_attr);
1377         LPROCFS_MD_OP_INIT(num_private_stats, stats, set_open_replay_data);
1378         LPROCFS_MD_OP_INIT(num_private_stats, stats, clear_open_replay_data);
1379         LPROCFS_MD_OP_INIT(num_private_stats, stats, set_lock_data);
1380         LPROCFS_MD_OP_INIT(num_private_stats, stats, lock_match);
1381         LPROCFS_MD_OP_INIT(num_private_stats, stats, cancel_unused);
1382         LPROCFS_MD_OP_INIT(num_private_stats, stats, get_remote_perm);
1383         LPROCFS_MD_OP_INIT(num_private_stats, stats, intent_getattr_async);
1384         LPROCFS_MD_OP_INIT(num_private_stats, stats, revalidate_lock);
1385 }
1386
1387 int lprocfs_alloc_md_stats(struct obd_device *obd,
1388                            unsigned int num_private_stats)
1389 {
1390         struct lprocfs_stats *stats;
1391         unsigned int num_stats;
1392         int rc, i;
1393
1394         CLASSERT(offsetof(struct md_ops, MD_STATS_FIRST_OP) == 0);
1395         CLASSERT(_MD_COUNTER_OFFSET(MD_STATS_FIRST_OP) == 0);
1396         CLASSERT(_MD_COUNTER_OFFSET(MD_STATS_LAST_OP) > 0);
1397
1398         /* TODO Ensure that this function is only used where
1399          * appropriate by adding an assertion to the effect that
1400          * obd->obd_type->typ_md_ops is not NULL. We can't do this now
1401          * because mdt_procfs_init() uses this function to allocate
1402          * the stats backing /proc/fs/lustre/mdt/.../md_stats but the
1403          * mdt layer does not use the md_ops interface. This is
1404          * confusing and a waste of memory. See LU-2484.
1405          */
1406         LASSERT(obd->obd_proc_entry != NULL);
1407         LASSERT(obd->obd_md_stats == NULL);
1408         LASSERT(obd->obd_md_cntr_base == 0);
1409
1410         num_stats = NUM_MD_STATS + num_private_stats;
1411         stats = lprocfs_alloc_stats(num_stats, 0);
1412         if (stats == NULL)
1413                 return -ENOMEM;
1414
1415         lprocfs_init_mps_stats(num_private_stats, stats);
1416
1417         for (i = num_private_stats; i < num_stats; i++) {
1418                 if (stats->ls_cnt_header[i].lc_name == NULL) {
1419                         CERROR("Missing md_stat initializer md_op "
1420                                "operation at offset %d. Aborting.\n",
1421                                i - num_private_stats);
1422                         LBUG();
1423                 }
1424         }
1425
1426         rc = lprocfs_register_stats(obd->obd_proc_entry, "md_stats", stats);
1427         if (rc < 0) {
1428                 lprocfs_free_stats(&stats);
1429         } else {
1430                 obd->obd_md_stats = stats;
1431                 obd->obd_md_cntr_base = num_private_stats;
1432         }
1433
1434         return rc;
1435 }
1436 EXPORT_SYMBOL(lprocfs_alloc_md_stats);
1437
1438 void lprocfs_free_md_stats(struct obd_device *obd)
1439 {
1440         struct lprocfs_stats *stats = obd->obd_md_stats;
1441
1442         if (stats != NULL) {
1443                 obd->obd_md_stats = NULL;
1444                 obd->obd_md_cntr_base = 0;
1445                 lprocfs_free_stats(&stats);
1446         }
1447 }
1448 EXPORT_SYMBOL(lprocfs_free_md_stats);
1449
1450 void lprocfs_init_ldlm_stats(struct lprocfs_stats *ldlm_stats)
1451 {
1452         lprocfs_counter_init(ldlm_stats,
1453                              LDLM_ENQUEUE - LDLM_FIRST_OPC,
1454                              0, "ldlm_enqueue", "reqs");
1455         lprocfs_counter_init(ldlm_stats,
1456                              LDLM_CONVERT - LDLM_FIRST_OPC,
1457                              0, "ldlm_convert", "reqs");
1458         lprocfs_counter_init(ldlm_stats,
1459                              LDLM_CANCEL - LDLM_FIRST_OPC,
1460                              0, "ldlm_cancel", "reqs");
1461         lprocfs_counter_init(ldlm_stats,
1462                              LDLM_BL_CALLBACK - LDLM_FIRST_OPC,
1463                              0, "ldlm_bl_callback", "reqs");
1464         lprocfs_counter_init(ldlm_stats,
1465                              LDLM_CP_CALLBACK - LDLM_FIRST_OPC,
1466                              0, "ldlm_cp_callback", "reqs");
1467         lprocfs_counter_init(ldlm_stats,
1468                              LDLM_GL_CALLBACK - LDLM_FIRST_OPC,
1469                              0, "ldlm_gl_callback", "reqs");
1470 }
1471 EXPORT_SYMBOL(lprocfs_init_ldlm_stats);
1472
1473 __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
1474                           struct lprocfs_counter_header *header,
1475                           enum lprocfs_stats_flags flags,
1476                           enum lprocfs_fields_flags field)
1477 {
1478         __s64 ret = 0;
1479
1480         if (lc == NULL || header == NULL)
1481                 RETURN(0);
1482
1483         switch (field) {
1484                 case LPROCFS_FIELDS_FLAGS_CONFIG:
1485                         ret = header->lc_config;
1486                         break;
1487                 case LPROCFS_FIELDS_FLAGS_SUM:
1488                         ret = lc->lc_sum;
1489                         if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1490                                 ret += lc->lc_sum_irq;
1491                         break;
1492                 case LPROCFS_FIELDS_FLAGS_MIN:
1493                         ret = lc->lc_min;
1494                         break;
1495                 case LPROCFS_FIELDS_FLAGS_MAX:
1496                         ret = lc->lc_max;
1497                         break;
1498                 case LPROCFS_FIELDS_FLAGS_AVG:
1499                         ret = (lc->lc_max - lc->lc_min) / 2;
1500                         break;
1501                 case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
1502                         ret = lc->lc_sumsquare;
1503                         break;
1504                 case LPROCFS_FIELDS_FLAGS_COUNT:
1505                         ret = lc->lc_count;
1506                         break;
1507                 default:
1508                         break;
1509         };
1510         RETURN(ret);
1511 }
1512 EXPORT_SYMBOL(lprocfs_read_helper);
1513
1514 int lprocfs_write_helper(const char __user *buffer, unsigned long count,
1515                          int *val)
1516 {
1517         return lprocfs_write_frac_helper(buffer, count, val, 1);
1518 }
1519 EXPORT_SYMBOL(lprocfs_write_helper);
1520
1521 int lprocfs_write_frac_helper(const char __user *buffer, unsigned long count,
1522                               int *val, int mult)
1523 {
1524         char kernbuf[20], *end, *pbuf;
1525
1526         if (count > (sizeof(kernbuf) - 1))
1527                 return -EINVAL;
1528
1529         if (copy_from_user(kernbuf, buffer, count))
1530                 return -EFAULT;
1531
1532         kernbuf[count] = '\0';
1533         pbuf = kernbuf;
1534         if (*pbuf == '-') {
1535                 mult = -mult;
1536                 pbuf++;
1537         }
1538
1539         *val = (int)simple_strtoul(pbuf, &end, 10) * mult;
1540         if (pbuf == end)
1541                 return -EINVAL;
1542
1543         if (end != NULL && *end == '.') {
1544                 int temp_val, pow = 1;
1545                 int i;
1546
1547                 pbuf = end + 1;
1548                 if (strlen(pbuf) > 5)
1549                         pbuf[5] = '\0'; /*only allow 5bits fractional*/
1550
1551                 temp_val = (int)simple_strtoul(pbuf, &end, 10) * mult;
1552
1553                 if (pbuf < end) {
1554                         for (i = 0; i < (end - pbuf); i++)
1555                                 pow *= 10;
1556
1557                         *val += temp_val / pow;
1558                 }
1559         }
1560         return 0;
1561 }
1562 EXPORT_SYMBOL(lprocfs_write_frac_helper);
1563
1564 int lprocfs_read_frac_helper(char *buffer, unsigned long count, long val,
1565                              int mult)
1566 {
1567         long decimal_val, frac_val;
1568         int prtn;
1569
1570         if (count < 10)
1571                 return -EINVAL;
1572
1573         decimal_val = val / mult;
1574         prtn = snprintf(buffer, count, "%ld", decimal_val);
1575         frac_val = val % mult;
1576
1577         if (prtn < (count - 4) && frac_val > 0) {
1578                 long temp_frac;
1579                 int i, temp_mult = 1, frac_bits = 0;
1580
1581                 temp_frac = frac_val * 10;
1582                 buffer[prtn++] = '.';
1583                 while (frac_bits < 2 && (temp_frac / mult) < 1 ) {
1584                         /* only reserved 2 bits fraction */
1585                         buffer[prtn++] ='0';
1586                         temp_frac *= 10;
1587                         frac_bits++;
1588                 }
1589                 /*
1590                  * Need to think these cases :
1591                  *      1. #echo x.00 > /proc/xxx       output result : x
1592                  *      2. #echo x.0x > /proc/xxx       output result : x.0x
1593                  *      3. #echo x.x0 > /proc/xxx       output result : x.x
1594                  *      4. #echo x.xx > /proc/xxx       output result : x.xx
1595                  *      Only reserved 2 bits fraction.
1596                  */
1597                 for (i = 0; i < (5 - prtn); i++)
1598                         temp_mult *= 10;
1599
1600                 frac_bits = min((int)count - prtn, 3 - frac_bits);
1601                 prtn += snprintf(buffer + prtn, frac_bits, "%ld",
1602                                  frac_val * temp_mult / mult);
1603
1604                 prtn--;
1605                 while(buffer[prtn] < '1' || buffer[prtn] > '9') {
1606                         prtn--;
1607                         if (buffer[prtn] == '.') {
1608                                 prtn--;
1609                                 break;
1610                         }
1611                 }
1612                 prtn++;
1613         }
1614         buffer[prtn++] ='\n';
1615         return prtn;
1616 }
1617
1618 int lprocfs_seq_read_frac_helper(struct seq_file *m, long val, int mult)
1619 {
1620         long decimal_val, frac_val;
1621
1622         decimal_val = val / mult;
1623         seq_printf(m, "%ld", decimal_val);
1624         frac_val = val % mult;
1625
1626         if (frac_val > 0) {
1627                 frac_val *= 100;
1628                 frac_val /= mult;
1629         }
1630         if (frac_val > 0) {
1631                 /* Three cases: x0, xx, 0x */
1632                 if ((frac_val % 10) != 0)
1633                         seq_printf(m, ".%ld", frac_val);
1634                 else
1635                         seq_printf(m, ".%ld", frac_val / 10);
1636         }
1637
1638         seq_printf(m, "\n");
1639         return 0;
1640 }
1641 EXPORT_SYMBOL(lprocfs_seq_read_frac_helper);
1642
1643 int lprocfs_write_u64_helper(const char __user *buffer, unsigned long count,
1644                              __u64 *val)
1645 {
1646         return lprocfs_write_frac_u64_helper(buffer, count, val, 1);
1647 }
1648 EXPORT_SYMBOL(lprocfs_write_u64_helper);
1649
1650 int lprocfs_write_frac_u64_helper(const char __user *buffer,
1651                                   unsigned long count,
1652                                   __u64 *val, int mult)
1653 {
1654         char kernbuf[22], *end, *pbuf;
1655         __u64 whole, frac = 0, units;
1656         unsigned frac_d = 1;
1657
1658         if (count > (sizeof(kernbuf) - 1))
1659                 return -EINVAL;
1660
1661         if (copy_from_user(kernbuf, buffer, count))
1662                 return -EFAULT;
1663
1664         kernbuf[count] = '\0';
1665         pbuf = kernbuf;
1666         if (*pbuf == '-') {
1667                 mult = -mult;
1668                 pbuf++;
1669         }
1670
1671         whole = simple_strtoull(pbuf, &end, 10);
1672         if (pbuf == end)
1673                 return -EINVAL;
1674
1675         if (end != NULL && *end == '.') {
1676                 int i;
1677                 pbuf = end + 1;
1678
1679                 /* need to limit frac_d to a __u32 */
1680                 if (strlen(pbuf) > 10)
1681                         pbuf[10] = '\0';
1682
1683                 frac = simple_strtoull(pbuf, &end, 10);
1684                 /* count decimal places */
1685                 for (i = 0; i < (end - pbuf); i++)
1686                         frac_d *= 10;
1687         }
1688
1689         units = 1;
1690         if (end != NULL) {
1691                 switch (*end) {
1692                 case 'p': case 'P':
1693                         units <<= 10;
1694                 case 't': case 'T':
1695                         units <<= 10;
1696                 case 'g': case 'G':
1697                         units <<= 10;
1698                 case 'm': case 'M':
1699                         units <<= 10;
1700                 case 'k': case 'K':
1701                         units <<= 10;
1702                 }
1703         }
1704         /* Specified units override the multiplier */
1705         if (units > 1)
1706                 mult = mult < 0 ? -units : units;
1707
1708         frac *= mult;
1709         do_div(frac, frac_d);
1710         *val = whole * mult + frac;
1711         return 0;
1712 }
1713 EXPORT_SYMBOL(lprocfs_write_frac_u64_helper);
1714
1715 static char *lprocfs_strnstr(const char *s1, const char *s2, size_t len)
1716 {
1717         size_t l2;
1718
1719         l2 = strlen(s2);
1720         if (!l2)
1721                 return (char *)s1;
1722         while (len >= l2) {
1723                 len--;
1724                 if (!memcmp(s1, s2, l2))
1725                         return (char *)s1;
1726                 s1++;
1727         }
1728         return NULL;
1729 }
1730
1731 /**
1732  * Find the string \a name in the input \a buffer, and return a pointer to the
1733  * value immediately following \a name, reducing \a count appropriately.
1734  * If \a name is not found the original \a buffer is returned.
1735  */
1736 char *lprocfs_find_named_value(const char *buffer, const char *name,
1737                                 size_t *count)
1738 {
1739         char *val;
1740         size_t buflen = *count;
1741
1742         /* there is no strnstr() in rhel5 and ubuntu kernels */
1743         val = lprocfs_strnstr(buffer, name, buflen);
1744         if (val == NULL)
1745                 return (char *)buffer;
1746
1747         val += strlen(name);                             /* skip prefix */
1748         while (val < buffer + buflen && isspace(*val)) /* skip separator */
1749                 val++;
1750
1751         *count = 0;
1752         while (val < buffer + buflen && isalnum(*val)) {
1753                 ++*count;
1754                 ++val;
1755         }
1756
1757         return val - *count;
1758 }
1759 EXPORT_SYMBOL(lprocfs_find_named_value);
1760
1761 int lprocfs_seq_create(struct proc_dir_entry *parent,
1762                        const char *name,
1763                        mode_t mode,
1764                        const struct file_operations *seq_fops,
1765                        void *data)
1766 {
1767         struct proc_dir_entry *entry;
1768         ENTRY;
1769
1770         /* Disallow secretly (un)writable entries. */
1771         LASSERT((seq_fops->write == NULL) == ((mode & 0222) == 0));
1772
1773         entry = proc_create_data(name, mode, parent, seq_fops, data);
1774
1775         if (entry == NULL)
1776                 RETURN(-ENOMEM);
1777
1778         RETURN(0);
1779 }
1780 EXPORT_SYMBOL(lprocfs_seq_create);
1781
1782 int lprocfs_obd_seq_create(struct obd_device *dev,
1783                            const char *name,
1784                            mode_t mode,
1785                            const struct file_operations *seq_fops,
1786                            void *data)
1787 {
1788         return (lprocfs_seq_create(dev->obd_proc_entry, name,
1789                                    mode, seq_fops, data));
1790 }
1791 EXPORT_SYMBOL(lprocfs_obd_seq_create);
1792
1793 void lprocfs_oh_tally(struct obd_histogram *oh, unsigned int value)
1794 {
1795         if (value >= OBD_HIST_MAX)
1796                 value = OBD_HIST_MAX - 1;
1797
1798         spin_lock(&oh->oh_lock);
1799         oh->oh_buckets[value]++;
1800         spin_unlock(&oh->oh_lock);
1801 }
1802 EXPORT_SYMBOL(lprocfs_oh_tally);
1803
1804 void lprocfs_oh_tally_log2(struct obd_histogram *oh, unsigned int value)
1805 {
1806         unsigned int val = 0;
1807
1808         if (likely(value != 0))
1809                 val = min(fls(value - 1), OBD_HIST_MAX);
1810
1811         lprocfs_oh_tally(oh, val);
1812 }
1813 EXPORT_SYMBOL(lprocfs_oh_tally_log2);
1814
1815 unsigned long lprocfs_oh_sum(struct obd_histogram *oh)
1816 {
1817         unsigned long ret = 0;
1818         int i;
1819
1820         for (i = 0; i < OBD_HIST_MAX; i++)
1821                 ret +=  oh->oh_buckets[i];
1822         return ret;
1823 }
1824 EXPORT_SYMBOL(lprocfs_oh_sum);
1825
1826 void lprocfs_oh_clear(struct obd_histogram *oh)
1827 {
1828         spin_lock(&oh->oh_lock);
1829         memset(oh->oh_buckets, 0, sizeof(oh->oh_buckets));
1830         spin_unlock(&oh->oh_lock);
1831 }
1832 EXPORT_SYMBOL(lprocfs_oh_clear);
1833
1834 int lprocfs_obd_rd_max_pages_per_rpc(char *page, char **start, off_t off,
1835                                      int count, int *eof, void *data)
1836 {
1837         struct obd_device *dev = data;
1838         struct client_obd *cli = &dev->u.cli;
1839         int rc;
1840
1841         spin_lock(&cli->cl_loi_list_lock);
1842         rc = snprintf(page, count, "%d\n", cli->cl_max_pages_per_rpc);
1843         spin_unlock(&cli->cl_loi_list_lock);
1844
1845         return rc;
1846 }
1847
1848 int lprocfs_obd_max_pages_per_rpc_seq_show(struct seq_file *m, void *data)
1849 {
1850         struct obd_device *dev = data;
1851         struct client_obd *cli = &dev->u.cli;
1852         int rc;
1853
1854         spin_lock(&cli->cl_loi_list_lock);
1855         rc = seq_printf(m, "%d\n", cli->cl_max_pages_per_rpc);
1856         spin_unlock(&cli->cl_loi_list_lock);
1857         return rc;
1858 }
1859 EXPORT_SYMBOL(lprocfs_obd_max_pages_per_rpc_seq_show);
1860
1861 int lprocfs_wr_root_squash(const char __user *buffer, unsigned long count,
1862                            struct root_squash_info *squash, char *name)
1863 {
1864         int rc;
1865         char kernbuf[64], *tmp, *errmsg;
1866         unsigned long uid, gid;
1867         ENTRY;
1868
1869         if (count >= sizeof(kernbuf)) {
1870                 errmsg = "string too long";
1871                 GOTO(failed_noprint, rc = -EINVAL);
1872         }
1873         if (copy_from_user(kernbuf, buffer, count)) {
1874                 errmsg = "bad address";
1875                 GOTO(failed_noprint, rc = -EFAULT);
1876         }
1877         kernbuf[count] = '\0';
1878
1879         /* look for uid gid separator */
1880         tmp = strchr(kernbuf, ':');
1881         if (tmp == NULL) {
1882                 errmsg = "needs uid:gid format";
1883                 GOTO(failed, rc = -EINVAL);
1884         }
1885         *tmp = '\0';
1886         tmp++;
1887
1888         /* parse uid */
1889         if (kstrtoul(kernbuf, 0, &uid) != 0) {
1890                 errmsg = "bad uid";
1891                 GOTO(failed, rc = -EINVAL);
1892         }
1893
1894         /* parse gid */
1895         if (kstrtoul(tmp, 0, &gid) != 0) {
1896                 errmsg = "bad gid";
1897                 GOTO(failed, rc = -EINVAL);
1898         }
1899
1900         squash->rsi_uid = uid;
1901         squash->rsi_gid = gid;
1902
1903         LCONSOLE_INFO("%s: root_squash is set to %u:%u\n",
1904                       name, squash->rsi_uid, squash->rsi_gid);
1905         RETURN(count);
1906
1907 failed:
1908         if (tmp != NULL) {
1909                 tmp--;
1910                 *tmp = ':';
1911         }
1912         CWARN("%s: failed to set root_squash to \"%s\", %s, rc = %d\n",
1913               name, kernbuf, errmsg, rc);
1914         RETURN(rc);
1915 failed_noprint:
1916         CWARN("%s: failed to set root_squash due to %s, rc = %d\n",
1917               name, errmsg, rc);
1918         RETURN(rc);
1919 }
1920 EXPORT_SYMBOL(lprocfs_wr_root_squash);
1921
1922
1923 int lprocfs_wr_nosquash_nids(const char __user *buffer, unsigned long count,
1924                              struct root_squash_info *squash, char *name)
1925 {
1926         int rc;
1927         char *kernbuf = NULL;
1928         char *errmsg;
1929         struct list_head tmp;
1930         int len = count;
1931         ENTRY;
1932
1933         if (count > 4096) {
1934                 errmsg = "string too long";
1935                 GOTO(failed, rc = -EINVAL);
1936         }
1937
1938         OBD_ALLOC(kernbuf, count + 1);
1939         if (kernbuf == NULL) {
1940                 errmsg = "no memory";
1941                 GOTO(failed, rc = -ENOMEM);
1942         }
1943         if (copy_from_user(kernbuf, buffer, count)) {
1944                 errmsg = "bad address";
1945                 GOTO(failed, rc = -EFAULT);
1946         }
1947         kernbuf[count] = '\0';
1948
1949         if (count > 0 && kernbuf[count - 1] == '\n')
1950                 len = count - 1;
1951
1952         if ((len == 4 && strncmp(kernbuf, "NONE", len) == 0) ||
1953             (len == 5 && strncmp(kernbuf, "clear", len) == 0)) {
1954                 /* empty string is special case */
1955                 down_write(&squash->rsi_sem);
1956                 if (!list_empty(&squash->rsi_nosquash_nids))
1957                         cfs_free_nidlist(&squash->rsi_nosquash_nids);
1958                 up_write(&squash->rsi_sem);
1959                 LCONSOLE_INFO("%s: nosquash_nids is cleared\n", name);
1960                 OBD_FREE(kernbuf, count + 1);
1961                 RETURN(count);
1962         }
1963
1964         INIT_LIST_HEAD(&tmp);
1965         if (cfs_parse_nidlist(kernbuf, count, &tmp) <= 0) {
1966                 errmsg = "can't parse";
1967                 GOTO(failed, rc = -EINVAL);
1968         }
1969         LCONSOLE_INFO("%s: nosquash_nids set to %s\n",
1970                       name, kernbuf);
1971         OBD_FREE(kernbuf, count + 1);
1972         kernbuf = NULL;
1973
1974         down_write(&squash->rsi_sem);
1975         if (!list_empty(&squash->rsi_nosquash_nids))
1976                 cfs_free_nidlist(&squash->rsi_nosquash_nids);
1977         list_splice(&tmp, &squash->rsi_nosquash_nids);
1978         up_write(&squash->rsi_sem);
1979
1980         RETURN(count);
1981
1982 failed:
1983         if (kernbuf) {
1984                 CWARN("%s: failed to set nosquash_nids to \"%s\", %s rc = %d\n",
1985                       name, kernbuf, errmsg, rc);
1986                 OBD_FREE(kernbuf, count + 1);
1987         } else {
1988                 CWARN("%s: failed to set nosquash_nids due to %s rc = %d\n",
1989                       name, errmsg, rc);
1990         }
1991         RETURN(rc);
1992 }
1993 EXPORT_SYMBOL(lprocfs_wr_nosquash_nids);
1994
1995 #endif /* CONFIG_PROC_FS*/