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, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * 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         "unknown",
 654         "dir_stripe",
 655         "unknown",
 656         NULL
 657 };
 658
 659 static void obd_connect_seq_flags2str(struct seq_file *m, __u64 flags, char *sep)
 660 {
 661         bool first = true;
 662         __u64 mask = 1;
 663         int i;
 664
 665         for (i = 0; obd_connect_names[i] != NULL; i++, mask <<= 1) {
 666                 if (flags & mask) {
 667                         seq_printf(m, "%s%s",
 668                                    first ? "" : sep, obd_connect_names[i]);
 669                         first = false;
 670                 }
 671         }
 672         if (flags & ~(mask - 1))
 673                 seq_printf(m, "%sunknown_"LPX64,
 674                            first ? "" : sep, flags & ~(mask - 1));
 675 }
 676
 677 int obd_connect_flags2str(char *page, int count, __u64 flags, char *sep)
 678 {
 679         __u64 mask = 1;
 680         int i, ret = 0;
 681
 682         for (i = 0; obd_connect_names[i] != NULL; i++, mask <<= 1) {
 683                 if (flags & mask)
 684                         ret += snprintf(page + ret, count - ret, "%s%s",
 685                                         ret ? sep : "", obd_connect_names[i]);
 686         }
 687         if (flags & ~(mask - 1))
 688                 ret += snprintf(page + ret, count - ret,
 689                                 "%sunknown_"LPX64,
 690                                 ret ? sep : "", flags & ~(mask - 1));
 691         return ret;
 692 }
 693 EXPORT_SYMBOL(obd_connect_flags2str);
 694
 695 static void obd_connect_data_seqprint(struct seq_file *m,
 696                                       struct obd_connect_data *ocd)
 697 {
 698         int flags;
 699
 700         LASSERT(ocd != NULL);
 701         flags = ocd->ocd_connect_flags;
 702
 703         seq_printf(m, "    connect_data:\n"
 704                       "       flags: "LPX64"\n"
 705                       "       instance: %u\n",
 706                       ocd->ocd_connect_flags,
 707                       ocd->ocd_instance);
 708         if (flags & OBD_CONNECT_VERSION)
 709                 seq_printf(m, "       target_version: %u.%u.%u.%u\n",
 710                               OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 711                               OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 712                               OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 713                               OBD_OCD_VERSION_FIX(ocd->ocd_version));
 714         if (flags & OBD_CONNECT_MDS)
 715                 seq_printf(m, "       mdt_index: %d\n", ocd->ocd_group);
 716         if (flags & OBD_CONNECT_GRANT)
 717                 seq_printf(m, "       initial_grant: %d\n", ocd->ocd_grant);
 718         if (flags & OBD_CONNECT_INDEX)
 719                 seq_printf(m, "       target_index: %u\n", ocd->ocd_index);
 720         if (flags & OBD_CONNECT_BRW_SIZE)
 721                 seq_printf(m, "       max_brw_size: %d\n", ocd->ocd_brw_size);
 722         if (flags & OBD_CONNECT_IBITS)
 723                 seq_printf(m, "       ibits_known: "LPX64"\n",
 724                                 ocd->ocd_ibits_known);
 725         if (flags & OBD_CONNECT_GRANT_PARAM)
 726                 seq_printf(m, "       grant_block_size: %d\n"
 727                               "       grant_inode_size: %d\n"
 728                               "       grant_extent_overhead: %d\n",
 729                               ocd->ocd_blocksize,
 730                               ocd->ocd_inodespace,
 731                               ocd->ocd_grant_extent);
 732         if (flags & OBD_CONNECT_TRANSNO)
 733                 seq_printf(m, "       first_transno: "LPX64"\n",
 734                                 ocd->ocd_transno);
 735         if (flags & OBD_CONNECT_CKSUM)
 736                 seq_printf(m, "       cksum_types: %#x\n",
 737                               ocd->ocd_cksum_types);
 738         if (flags & OBD_CONNECT_MAX_EASIZE)
 739                 seq_printf(m, "       max_easize: %d\n", ocd->ocd_max_easize);
 740         if (flags & OBD_CONNECT_MAXBYTES)
 741                 seq_printf(m, "       max_object_bytes: "LPU64"\n",
 742                               ocd->ocd_maxbytes);
 743 }
 744
 745 int lprocfs_import_seq_show(struct seq_file *m, void *data)
 746 {
 747         char                            nidstr[LNET_NIDSTR_SIZE];
 748         struct lprocfs_counter          ret;
 749         struct lprocfs_counter_header   *header;
 750         struct obd_device               *obd    = (struct obd_device *)data;
 751         struct obd_import               *imp;
 752         struct obd_import_conn          *conn;
 753         struct obd_connect_data         *ocd;
 754         int                             j;
 755         int                             k;
 756         int                             rw      = 0;
 757
 758         LASSERT(obd != NULL);
 759         LPROCFS_CLIMP_CHECK(obd);
 760         imp = obd->u.cli.cl_import;
 761         ocd = &imp->imp_connect_data;
 762
 763         seq_printf(m, "import:\n"
 764                       "    name: %s\n"
 765                       "    target: %s\n"
 766                       "    state: %s\n"
 767                       "    connect_flags: [ ",
 768                       obd->obd_name,
 769                       obd2cli_tgt(obd),
 770                       ptlrpc_import_state_name(imp->imp_state));
 771         obd_connect_seq_flags2str(m, imp->imp_connect_data.ocd_connect_flags,
 772                                         ", ");
 773         seq_printf(m, " ]\n");
 774         obd_connect_data_seqprint(m, ocd);
 775         seq_printf(m, "    import_flags: [ ");
 776         obd_import_flags2str(imp, m);
 777
 778         seq_printf(m, " ]\n"
 779                       "    connection:\n"
 780                       "       failover_nids: [ ");
 781         spin_lock(&imp->imp_lock);
 782         j = 0;
 783         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 784                 libcfs_nid2str_r(conn->oic_conn->c_peer.nid,
 785                                  nidstr, sizeof(nidstr));
 786                 seq_printf(m, "%s%s", j ? ", " : "", nidstr);
 787                 j++;
 788         }
 789         libcfs_nid2str_r(imp->imp_connection->c_peer.nid,
 790                          nidstr, sizeof(nidstr));
 791         seq_printf(m, " ]\n"
 792                       "       current_connection: %s\n"
 793                       "       connection_attempts: %u\n"
 794                       "       generation: %u\n"
 795                       "       in-progress_invalidations: %u\n",
 796                       imp->imp_connection == NULL ? "<none>" : nidstr,
 797                       imp->imp_conn_cnt,
 798                       imp->imp_generation,
 799                       atomic_read(&imp->imp_inval_count));
 800         spin_unlock(&imp->imp_lock);
 801
 802         if (obd->obd_svc_stats == NULL)
 803                 goto out_climp;
 804
 805         header = &obd->obd_svc_stats->ls_cnt_header[PTLRPC_REQWAIT_CNTR];
 806         lprocfs_stats_collect(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR, &ret);
 807         if (ret.lc_count != 0) {
 808                 /* first argument to do_div MUST be __u64 */
 809                 __u64 sum = ret.lc_sum;
 810                 do_div(sum, ret.lc_count);
 811                 ret.lc_sum = sum;
 812         } else
 813                 ret.lc_sum = 0;
 814         seq_printf(m, "    rpcs:\n"
 815                       "       inflight: %u\n"
 816                       "       unregistering: %u\n"
 817                       "       timeouts: %u\n"
 818                       "       avg_waittime: "LPU64" %s\n",
 819                       atomic_read(&imp->imp_inflight),
 820                       atomic_read(&imp->imp_unregistering),
 821                       atomic_read(&imp->imp_timeouts),
 822                       ret.lc_sum, header->lc_units);
 823
 824         k = 0;
 825         for(j = 0; j < IMP_AT_MAX_PORTALS; j++) {
 826                 if (imp->imp_at.iat_portal[j] == 0)
 827                         break;
 828                 k = max_t(unsigned int, k,
 829                           at_get(&imp->imp_at.iat_service_estimate[j]));
 830         }
 831         seq_printf(m, "    service_estimates:\n"
 832                       "       services: %u sec\n"
 833                       "       network: %u sec\n",
 834                       k,
 835                       at_get(&imp->imp_at.iat_net_latency));
 836
 837         seq_printf(m, "    transactions:\n"
 838                       "       last_replay: "LPU64"\n"
 839                       "       peer_committed: "LPU64"\n"
 840                       "       last_checked: "LPU64"\n",
 841                       imp->imp_last_replay_transno,
 842                       imp->imp_peer_committed_transno,
 843                       imp->imp_last_transno_checked);
 844
 845         /* avg data rates */
 846         for (rw = 0; rw <= 1; rw++) {
 847                 lprocfs_stats_collect(obd->obd_svc_stats,
 848                                       PTLRPC_LAST_CNTR + BRW_READ_BYTES + rw,
 849                                       &ret);
 850                 if (ret.lc_sum > 0 && ret.lc_count > 0) {
 851                         /* first argument to do_div MUST be __u64 */
 852                         __u64 sum = ret.lc_sum;
 853                         do_div(sum, ret.lc_count);
 854                         ret.lc_sum = sum;
 855                         seq_printf(m, "    %s_data_averages:\n"
 856                                       "       bytes_per_rpc: "LPU64"\n",
 857                                       rw ? "write" : "read",
 858                                       ret.lc_sum);
 859                 }
 860                 k = (int)ret.lc_sum;
 861                 j = opcode_offset(OST_READ + rw) + EXTRA_MAX_OPCODES;
 862                 header = &obd->obd_svc_stats->ls_cnt_header[j];
 863                 lprocfs_stats_collect(obd->obd_svc_stats, j, &ret);
 864                 if (ret.lc_sum > 0 && ret.lc_count != 0) {
 865                         /* first argument to do_div MUST be __u64 */
 866                         __u64 sum = ret.lc_sum;
 867                         do_div(sum, ret.lc_count);
 868                         ret.lc_sum = sum;
 869                         seq_printf(m, "       %s_per_rpc: "LPU64"\n",
 870                                         header->lc_units, ret.lc_sum);
 871                         j = (int)ret.lc_sum;
 872                         if (j > 0)
 873                                 seq_printf(m, "       MB_per_sec: %u.%.02u\n",
 874                                                 k / j, (100 * k / j) % 100);
 875                 }
 876         }
 877
 878 out_climp:
 879         LPROCFS_CLIMP_EXIT(obd);
 880         return 0;
 881 }
 882 EXPORT_SYMBOL(lprocfs_import_seq_show);
 883
 884 int lprocfs_state_seq_show(struct seq_file *m, void *data)
 885 {
 886         struct obd_device *obd = (struct obd_device *)data;
 887         struct obd_import *imp;
 888         int j, k;
 889
 890         LASSERT(obd != NULL);
 891         LPROCFS_CLIMP_CHECK(obd);
 892         imp = obd->u.cli.cl_import;
 893
 894         seq_printf(m, "current_state: %s\n",
 895                    ptlrpc_import_state_name(imp->imp_state));
 896         seq_printf(m, "state_history:\n");
 897         k = imp->imp_state_hist_idx;
 898         for (j = 0; j < IMP_STATE_HIST_LEN; j++) {
 899                 struct import_state_hist *ish =
 900                         &imp->imp_state_hist[(k + j) % IMP_STATE_HIST_LEN];
 901                 if (ish->ish_state == 0)
 902                         continue;
 903                 seq_printf(m, " - [ "CFS_TIME_T", %s ]\n",
 904                            ish->ish_time,
 905                 ptlrpc_import_state_name(ish->ish_state));
 906         }
 907
 908         LPROCFS_CLIMP_EXIT(obd);
 909         return 0;
 910 }
 911 EXPORT_SYMBOL(lprocfs_state_seq_show);
 912
 913 int lprocfs_at_hist_helper(struct seq_file *m, struct adaptive_timeout *at)
 914 {
 915         int i;
 916         for (i = 0; i < AT_BINS; i++)
 917                 seq_printf(m, "%3u ", at->at_hist[i]);
 918         seq_printf(m, "\n");
 919         return 0;
 920 }
 921 EXPORT_SYMBOL(lprocfs_at_hist_helper);
 922
 923 /* See also ptlrpc_lprocfs_timeouts_show_seq */
 924 int lprocfs_timeouts_seq_show(struct seq_file *m, void *data)
 925 {
 926         struct obd_device *obd = (struct obd_device *)data;
 927         struct obd_import *imp;
 928         unsigned int cur, worst;
 929         time_t now, worstt;
 930         struct dhms ts;
 931         int i;
 932
 933         LASSERT(obd != NULL);
 934         LPROCFS_CLIMP_CHECK(obd);
 935         imp = obd->u.cli.cl_import;
 936
 937         now = cfs_time_current_sec();
 938
 939         /* Some network health info for kicks */
 940         s2dhms(&ts, now - imp->imp_last_reply_time);
 941         seq_printf(m, "%-10s : %ld, "DHMS_FMT" ago\n",
 942                    "last reply", imp->imp_last_reply_time, DHMS_VARS(&ts));
 943
 944         cur = at_get(&imp->imp_at.iat_net_latency);
 945         worst = imp->imp_at.iat_net_latency.at_worst_ever;
 946         worstt = imp->imp_at.iat_net_latency.at_worst_time;
 947         s2dhms(&ts, now - worstt);
 948         seq_printf(m, "%-10s : cur %3u  worst %3u (at %ld, "DHMS_FMT" ago) ",
 949                    "network", cur, worst, worstt, DHMS_VARS(&ts));
 950         lprocfs_at_hist_helper(m, &imp->imp_at.iat_net_latency);
 951
 952         for(i = 0; i < IMP_AT_MAX_PORTALS; i++) {
 953                 if (imp->imp_at.iat_portal[i] == 0)
 954                         break;
 955                 cur = at_get(&imp->imp_at.iat_service_estimate[i]);
 956                 worst = imp->imp_at.iat_service_estimate[i].at_worst_ever;
 957                 worstt = imp->imp_at.iat_service_estimate[i].at_worst_time;
 958                 s2dhms(&ts, now - worstt);
 959                 seq_printf(m, "portal %-2d  : cur %3u  worst %3u (at %ld, "
 960                            DHMS_FMT" ago) ", imp->imp_at.iat_portal[i],
 961                            cur, worst, worstt, DHMS_VARS(&ts));
 962                 lprocfs_at_hist_helper(m, &imp->imp_at.iat_service_estimate[i]);
 963         }
 964
 965         LPROCFS_CLIMP_EXIT(obd);
 966         return 0;
 967 }
 968 EXPORT_SYMBOL(lprocfs_timeouts_seq_show);
 969
 970 int lprocfs_connect_flags_seq_show(struct seq_file *m, void *data)
 971 {
 972         struct obd_device *obd = data;
 973         __u64 flags;
 974
 975         LPROCFS_CLIMP_CHECK(obd);
 976         flags = obd->u.cli.cl_import->imp_connect_data.ocd_connect_flags;
 977         seq_printf(m, "flags="LPX64"\n", flags);
 978         obd_connect_seq_flags2str(m, flags, "\n");
 979         seq_printf(m, "\n");
 980         LPROCFS_CLIMP_EXIT(obd);
 981         return 0;
 982 }
 983 EXPORT_SYMBOL(lprocfs_connect_flags_seq_show);
 984
 985 int
 986 lprocfs_obd_setup(struct obd_device *obd)
 987 {
 988         int rc = 0;
 989
 990         LASSERT(obd != NULL);
 991         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 992         LASSERT(obd->obd_type->typ_procroot != NULL);
 993
 994         obd->obd_proc_entry = lprocfs_register(obd->obd_name,
 995                                                obd->obd_type->typ_procroot,
 996                                                obd->obd_vars, obd);
 997         if (IS_ERR(obd->obd_proc_entry)) {
 998                 rc = PTR_ERR(obd->obd_proc_entry);
 999                 CERROR("error %d setting up lprocfs for %s\n",rc,obd->obd_name);
1000                 obd->obd_proc_entry = NULL;
1001         }
1002         return rc;
1003 }
1004 EXPORT_SYMBOL(lprocfs_obd_setup);
1005
1006 int lprocfs_obd_cleanup(struct obd_device *obd)
1007 {
1008         if (!obd)
1009                 return -EINVAL;
1010         if (obd->obd_proc_exports_entry) {
1011                 /* Should be no exports left */
1012                 lprocfs_remove(&obd->obd_proc_exports_entry);
1013                 obd->obd_proc_exports_entry = NULL;
1014         }
1015         if (obd->obd_proc_entry) {
1016                 lprocfs_remove(&obd->obd_proc_entry);
1017                 obd->obd_proc_entry = NULL;
1018         }
1019         return 0;
1020 }
1021 EXPORT_SYMBOL(lprocfs_obd_cleanup);
1022
1023 int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int cpuid)
1024 {
1025         struct lprocfs_counter  *cntr;
1026         unsigned int            percpusize;
1027         int                     rc = -ENOMEM;
1028         unsigned long           flags = 0;
1029         int                     i;
1030
1031         LASSERT(stats->ls_percpu[cpuid] == NULL);
1032         LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);
1033
1034         percpusize = lprocfs_stats_counter_size(stats);
1035         LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[cpuid], percpusize);
1036         if (stats->ls_percpu[cpuid] != NULL) {
1037                 rc = 0;
1038                 if (unlikely(stats->ls_biggest_alloc_num <= cpuid)) {
1039                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1040                                 spin_lock_irqsave(&stats->ls_lock, flags);
1041                         else
1042                                 spin_lock(&stats->ls_lock);
1043                         if (stats->ls_biggest_alloc_num <= cpuid)
1044                                 stats->ls_biggest_alloc_num = cpuid + 1;
1045                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) {
1046                                 spin_unlock_irqrestore(&stats->ls_lock, flags);
1047                         } else {
1048                                 spin_unlock(&stats->ls_lock);
1049                         }
1050                 }
1051                 /* initialize the ls_percpu[cpuid] non-zero counter */
1052                 for (i = 0; i < stats->ls_num; ++i) {
1053                         cntr = lprocfs_stats_counter_get(stats, cpuid, i);
1054                         cntr->lc_min = LC_MIN_INIT;
1055                 }
1056         }
1057         return rc;
1058 }
1059
1060 struct lprocfs_stats *lprocfs_alloc_stats(unsigned int num,
1061                                           enum lprocfs_stats_flags flags)
1062 {
1063         struct lprocfs_stats    *stats;
1064         unsigned int            num_entry;
1065         unsigned int            percpusize = 0;
1066         int                     i;
1067
1068         if (num == 0)
1069                 return NULL;
1070
1071         if (lprocfs_no_percpu_stats != 0)
1072                 flags |= LPROCFS_STATS_FLAG_NOPERCPU;
1073
1074         if (flags & LPROCFS_STATS_FLAG_NOPERCPU)
1075                 num_entry = 1;
1076         else
1077                 num_entry = num_possible_cpus();
1078
1079         /* alloc percpu pointers for all possible cpu slots */
1080         LIBCFS_ALLOC(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1081         if (stats == NULL)
1082                 return NULL;
1083
1084         stats->ls_num = num;
1085         stats->ls_flags = flags;
1086         spin_lock_init(&stats->ls_lock);
1087
1088         /* alloc num of counter headers */
1089         LIBCFS_ALLOC(stats->ls_cnt_header,
1090                      stats->ls_num * sizeof(struct lprocfs_counter_header));
1091         if (stats->ls_cnt_header == NULL)
1092                 goto fail;
1093
1094         if ((flags & LPROCFS_STATS_FLAG_NOPERCPU) != 0) {
1095                 /* contains only one set counters */
1096                 percpusize = lprocfs_stats_counter_size(stats);
1097                 LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[0], percpusize);
1098                 if (stats->ls_percpu[0] == NULL)
1099                         goto fail;
1100                 stats->ls_biggest_alloc_num = 1;
1101         } else if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0) {
1102                 /* alloc all percpu data, currently only obd_memory use this */
1103                 for (i = 0; i < num_entry; ++i)
1104                         if (lprocfs_stats_alloc_one(stats, i) < 0)
1105                                 goto fail;
1106         }
1107
1108         return stats;
1109
1110 fail:
1111         lprocfs_free_stats(&stats);
1112         return NULL;
1113 }
1114 EXPORT_SYMBOL(lprocfs_alloc_stats);
1115
1116 void lprocfs_free_stats(struct lprocfs_stats **statsh)
1117 {
1118         struct lprocfs_stats *stats = *statsh;
1119         unsigned int num_entry;
1120         unsigned int percpusize;
1121         unsigned int i;
1122
1123         if (stats == NULL || stats->ls_num == 0)
1124                 return;
1125         *statsh = NULL;
1126
1127         if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU)
1128                 num_entry = 1;
1129         else
1130                 num_entry = num_possible_cpus();
1131
1132         percpusize = lprocfs_stats_counter_size(stats);
1133         for (i = 0; i < num_entry; i++)
1134                 if (stats->ls_percpu[i] != NULL)
1135                         LIBCFS_FREE(stats->ls_percpu[i], percpusize);
1136         if (stats->ls_cnt_header != NULL)
1137                 LIBCFS_FREE(stats->ls_cnt_header, stats->ls_num *
1138                                         sizeof(struct lprocfs_counter_header));
1139         LIBCFS_FREE(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1140 }
1141 EXPORT_SYMBOL(lprocfs_free_stats);
1142
1143 void lprocfs_clear_stats(struct lprocfs_stats *stats)
1144 {
1145         struct lprocfs_counter          *percpu_cntr;
1146         int                             i;
1147         int                             j;
1148         unsigned int                    num_entry;
1149         unsigned long                   flags = 0;
1150
1151         num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1152
1153         for (i = 0; i < num_entry; i++) {
1154                 if (stats->ls_percpu[i] == NULL)
1155                         continue;
1156                 for (j = 0; j < stats->ls_num; j++) {
1157                         percpu_cntr = lprocfs_stats_counter_get(stats, i, j);
1158                         percpu_cntr->lc_count           = 0;
1159                         percpu_cntr->lc_min             = LC_MIN_INIT;
1160                         percpu_cntr->lc_max             = 0;
1161                         percpu_cntr->lc_sumsquare       = 0;
1162                         percpu_cntr->lc_sum             = 0;
1163                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1164                                 percpu_cntr->lc_sum_irq = 0;
1165                 }
1166         }
1167
1168         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1169 }
1170 EXPORT_SYMBOL(lprocfs_clear_stats);
1171
1172 static ssize_t lprocfs_stats_seq_write(struct file *file,
1173                                        const char __user *buf,
1174                                        size_t len, loff_t *off)
1175 {
1176         struct seq_file *seq = file->private_data;
1177         struct lprocfs_stats *stats = seq->private;
1178
1179         lprocfs_clear_stats(stats);
1180
1181         return len;
1182 }
1183
1184 static void *lprocfs_stats_seq_start(struct seq_file *p, loff_t *pos)
1185 {
1186         struct lprocfs_stats *stats = p->private;
1187
1188         return (*pos < stats->ls_num) ? pos : NULL;
1189 }
1190
1191 static void lprocfs_stats_seq_stop(struct seq_file *p, void *v)
1192 {
1193 }
1194
1195 static void *lprocfs_stats_seq_next(struct seq_file *p, void *v, loff_t *pos)
1196 {
1197         (*pos)++;
1198
1199         return lprocfs_stats_seq_start(p, pos);
1200 }
1201
1202 /* seq file export of one lprocfs counter */
1203 static int lprocfs_stats_seq_show(struct seq_file *p, void *v)
1204 {
1205         struct lprocfs_stats            *stats  = p->private;
1206         struct lprocfs_counter_header   *hdr;
1207         struct lprocfs_counter           ctr;
1208         int                              idx    = *(loff_t *)v;
1209         int                              rc     = 0;
1210
1211         if (idx == 0) {
1212                 struct timeval now;
1213
1214                 do_gettimeofday(&now);
1215                 rc = seq_printf(p, "%-25s %lu.%lu secs.usecs\n",
1216                                 "snapshot_time", now.tv_sec, now.tv_usec);
1217                 if (rc < 0)
1218                         return rc;
1219         }
1220
1221         hdr = &stats->ls_cnt_header[idx];
1222         lprocfs_stats_collect(stats, idx, &ctr);
1223
1224         if (ctr.lc_count == 0)
1225                 goto out;
1226
1227         rc = seq_printf(p, "%-25s "LPD64" samples [%s]", hdr->lc_name,
1228                         ctr.lc_count, hdr->lc_units);
1229         if (rc < 0)
1230                 goto out;
1231
1232         if ((hdr->lc_config & LPROCFS_CNTR_AVGMINMAX) && ctr.lc_count > 0) {
1233                 rc = seq_printf(p, " "LPD64" "LPD64" "LPD64,
1234                                 ctr.lc_min, ctr.lc_max, ctr.lc_sum);
1235                 if (rc < 0)
1236                         goto out;
1237                 if (hdr->lc_config & LPROCFS_CNTR_STDDEV)
1238                         rc = seq_printf(p, " "LPD64, ctr.lc_sumsquare);
1239                 if (rc < 0)
1240                         goto out;
1241         }
1242         rc = seq_printf(p, "\n");
1243 out:
1244         return (rc < 0) ? rc : 0;
1245 }
1246
1247 static const struct seq_operations lprocfs_stats_seq_sops = {
1248         .start  = lprocfs_stats_seq_start,
1249         .stop   = lprocfs_stats_seq_stop,
1250         .next   = lprocfs_stats_seq_next,
1251         .show   = lprocfs_stats_seq_show,
1252 };
1253
1254 static int lprocfs_stats_seq_open(struct inode *inode, struct file *file)
1255 {
1256         struct seq_file *seq;
1257         int rc;
1258
1259         rc = LPROCFS_ENTRY_CHECK(inode);
1260         if (rc < 0)
1261                 return rc;
1262
1263         rc = seq_open(file, &lprocfs_stats_seq_sops);
1264         if (rc)
1265                 return rc;
1266         seq = file->private_data;
1267         seq->private = PDE_DATA(inode);
1268         return 0;
1269 }
1270
1271 static const struct file_operations lprocfs_stats_seq_fops = {
1272         .owner   = THIS_MODULE,
1273         .open    = lprocfs_stats_seq_open,
1274         .read    = seq_read,
1275         .write   = lprocfs_stats_seq_write,
1276         .llseek  = seq_lseek,
1277         .release = lprocfs_seq_release,
1278 };
1279
1280 int lprocfs_register_stats(struct proc_dir_entry *root, const char *name,
1281                            struct lprocfs_stats *stats)
1282 {
1283         struct proc_dir_entry *entry;
1284         LASSERT(root != NULL);
1285
1286         entry = proc_create_data(name, 0644, root,
1287                                  &lprocfs_stats_seq_fops, stats);
1288         if (entry == NULL)
1289                 return -ENOMEM;
1290         return 0;
1291 }
1292 EXPORT_SYMBOL(lprocfs_register_stats);
1293
1294 void lprocfs_counter_init(struct lprocfs_stats *stats, int index,
1295                           unsigned conf, const char *name, const char *units)
1296 {
1297         struct lprocfs_counter_header   *header;
1298         struct lprocfs_counter          *percpu_cntr;
1299         unsigned long                   flags = 0;
1300         unsigned int                    i;
1301         unsigned int                    num_cpu;
1302
1303         LASSERT(stats != NULL);
1304
1305         header = &stats->ls_cnt_header[index];
1306         LASSERTF(header != NULL, "Failed to allocate stats header:[%d]%s/%s\n",
1307                  index, name, units);
1308
1309         header->lc_config = conf;
1310         header->lc_name   = name;
1311         header->lc_units  = units;
1312
1313         num_cpu = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1314         for (i = 0; i < num_cpu; ++i) {
1315                 if (stats->ls_percpu[i] == NULL)
1316                         continue;
1317                 percpu_cntr = lprocfs_stats_counter_get(stats, i, index);
1318                 percpu_cntr->lc_count           = 0;
1319                 percpu_cntr->lc_min             = LC_MIN_INIT;
1320                 percpu_cntr->lc_max             = 0;
1321                 percpu_cntr->lc_sumsquare       = 0;
1322                 percpu_cntr->lc_sum             = 0;
1323                 if ((stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1324                         percpu_cntr->lc_sum_irq = 0;
1325         }
1326         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1327 }
1328 EXPORT_SYMBOL(lprocfs_counter_init);
1329
1330 /* Note that we only init md counters for ops whose offset is less
1331  * than NUM_MD_STATS. This is explained in a comment in the definition
1332  * of struct md_ops. */
1333 #define LPROCFS_MD_OP_INIT(base, stats, op)                                    \
1334         do {                                                                   \
1335                 unsigned int _idx = base + MD_COUNTER_OFFSET(op);              \
1336                                                                                \
1337                 if (MD_COUNTER_OFFSET(op) < NUM_MD_STATS) {                    \
1338                         LASSERT(_idx < stats->ls_num);                         \
1339                         lprocfs_counter_init(stats, _idx, 0, #op, "reqs");     \
1340                 }                                                              \
1341         } while (0)
1342
1343 void lprocfs_init_mps_stats(int num_private_stats, struct lprocfs_stats *stats)
1344 {
1345         LPROCFS_MD_OP_INIT(num_private_stats, stats, getstatus);
1346         LPROCFS_MD_OP_INIT(num_private_stats, stats, null_inode);
1347         LPROCFS_MD_OP_INIT(num_private_stats, stats, find_cbdata);
1348         LPROCFS_MD_OP_INIT(num_private_stats, stats, close);
1349         LPROCFS_MD_OP_INIT(num_private_stats, stats, create);
1350         LPROCFS_MD_OP_INIT(num_private_stats, stats, done_writing);
1351         LPROCFS_MD_OP_INIT(num_private_stats, stats, enqueue);
1352         LPROCFS_MD_OP_INIT(num_private_stats, stats, getattr);
1353         LPROCFS_MD_OP_INIT(num_private_stats, stats, getattr_name);
1354         LPROCFS_MD_OP_INIT(num_private_stats, stats, intent_lock);
1355         LPROCFS_MD_OP_INIT(num_private_stats, stats, link);
1356         LPROCFS_MD_OP_INIT(num_private_stats, stats, rename);
1357         LPROCFS_MD_OP_INIT(num_private_stats, stats, setattr);
1358         LPROCFS_MD_OP_INIT(num_private_stats, stats, fsync);
1359         LPROCFS_MD_OP_INIT(num_private_stats, stats, read_page);
1360         LPROCFS_MD_OP_INIT(num_private_stats, stats, unlink);
1361         LPROCFS_MD_OP_INIT(num_private_stats, stats, setxattr);
1362         LPROCFS_MD_OP_INIT(num_private_stats, stats, getxattr);
1363         LPROCFS_MD_OP_INIT(num_private_stats, stats, init_ea_size);
1364         LPROCFS_MD_OP_INIT(num_private_stats, stats, get_lustre_md);
1365         LPROCFS_MD_OP_INIT(num_private_stats, stats, free_lustre_md);
1366         LPROCFS_MD_OP_INIT(num_private_stats, stats, merge_attr);
1367         LPROCFS_MD_OP_INIT(num_private_stats, stats, set_open_replay_data);
1368         LPROCFS_MD_OP_INIT(num_private_stats, stats, clear_open_replay_data);
1369         LPROCFS_MD_OP_INIT(num_private_stats, stats, set_lock_data);
1370         LPROCFS_MD_OP_INIT(num_private_stats, stats, lock_match);
1371         LPROCFS_MD_OP_INIT(num_private_stats, stats, cancel_unused);
1372         LPROCFS_MD_OP_INIT(num_private_stats, stats, renew_capa);
1373         LPROCFS_MD_OP_INIT(num_private_stats, stats, unpack_capa);
1374         LPROCFS_MD_OP_INIT(num_private_stats, stats, get_remote_perm);
1375         LPROCFS_MD_OP_INIT(num_private_stats, stats, intent_getattr_async);
1376         LPROCFS_MD_OP_INIT(num_private_stats, stats, revalidate_lock);
1377 }
1378
1379 int lprocfs_alloc_md_stats(struct obd_device *obd,
1380                            unsigned int num_private_stats)
1381 {
1382         struct lprocfs_stats *stats;
1383         unsigned int num_stats;
1384         int rc, i;
1385
1386         CLASSERT(offsetof(struct md_ops, MD_STATS_FIRST_OP) == 0);
1387         CLASSERT(_MD_COUNTER_OFFSET(MD_STATS_FIRST_OP) == 0);
1388         CLASSERT(_MD_COUNTER_OFFSET(MD_STATS_LAST_OP) > 0);
1389
1390         /* TODO Ensure that this function is only used where
1391          * appropriate by adding an assertion to the effect that
1392          * obd->obd_type->typ_md_ops is not NULL. We can't do this now
1393          * because mdt_procfs_init() uses this function to allocate
1394          * the stats backing /proc/fs/lustre/mdt/.../md_stats but the
1395          * mdt layer does not use the md_ops interface. This is
1396          * confusing and a waste of memory. See LU-2484.
1397          */
1398         LASSERT(obd->obd_proc_entry != NULL);
1399         LASSERT(obd->obd_md_stats == NULL);
1400         LASSERT(obd->obd_md_cntr_base == 0);
1401
1402         num_stats = NUM_MD_STATS + num_private_stats;
1403         stats = lprocfs_alloc_stats(num_stats, 0);
1404         if (stats == NULL)
1405                 return -ENOMEM;
1406
1407         lprocfs_init_mps_stats(num_private_stats, stats);
1408
1409         for (i = num_private_stats; i < num_stats; i++) {
1410                 if (stats->ls_cnt_header[i].lc_name == NULL) {
1411                         CERROR("Missing md_stat initializer md_op "
1412                                "operation at offset %d. Aborting.\n",
1413                                i - num_private_stats);
1414                         LBUG();
1415                 }
1416         }
1417
1418         rc = lprocfs_register_stats(obd->obd_proc_entry, "md_stats", stats);
1419         if (rc < 0) {
1420                 lprocfs_free_stats(&stats);
1421         } else {
1422                 obd->obd_md_stats = stats;
1423                 obd->obd_md_cntr_base = num_private_stats;
1424         }
1425
1426         return rc;
1427 }
1428 EXPORT_SYMBOL(lprocfs_alloc_md_stats);
1429
1430 void lprocfs_free_md_stats(struct obd_device *obd)
1431 {
1432         struct lprocfs_stats *stats = obd->obd_md_stats;
1433
1434         if (stats != NULL) {
1435                 obd->obd_md_stats = NULL;
1436                 obd->obd_md_cntr_base = 0;
1437                 lprocfs_free_stats(&stats);
1438         }
1439 }
1440 EXPORT_SYMBOL(lprocfs_free_md_stats);
1441
1442 void lprocfs_init_ldlm_stats(struct lprocfs_stats *ldlm_stats)
1443 {
1444         lprocfs_counter_init(ldlm_stats,
1445                              LDLM_ENQUEUE - LDLM_FIRST_OPC,
1446                              0, "ldlm_enqueue", "reqs");
1447         lprocfs_counter_init(ldlm_stats,
1448                              LDLM_CONVERT - LDLM_FIRST_OPC,
1449                              0, "ldlm_convert", "reqs");
1450         lprocfs_counter_init(ldlm_stats,
1451                              LDLM_CANCEL - LDLM_FIRST_OPC,
1452                              0, "ldlm_cancel", "reqs");
1453         lprocfs_counter_init(ldlm_stats,
1454                              LDLM_BL_CALLBACK - LDLM_FIRST_OPC,
1455                              0, "ldlm_bl_callback", "reqs");
1456         lprocfs_counter_init(ldlm_stats,
1457                              LDLM_CP_CALLBACK - LDLM_FIRST_OPC,
1458                              0, "ldlm_cp_callback", "reqs");
1459         lprocfs_counter_init(ldlm_stats,
1460                              LDLM_GL_CALLBACK - LDLM_FIRST_OPC,
1461                              0, "ldlm_gl_callback", "reqs");
1462 }
1463 EXPORT_SYMBOL(lprocfs_init_ldlm_stats);
1464
1465 __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
1466                           struct lprocfs_counter_header *header,
1467                           enum lprocfs_stats_flags flags,
1468                           enum lprocfs_fields_flags field)
1469 {
1470         __s64 ret = 0;
1471
1472         if (lc == NULL || header == NULL)
1473                 RETURN(0);
1474
1475         switch (field) {
1476                 case LPROCFS_FIELDS_FLAGS_CONFIG:
1477                         ret = header->lc_config;
1478                         break;
1479                 case LPROCFS_FIELDS_FLAGS_SUM:
1480                         ret = lc->lc_sum;
1481                         if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1482                                 ret += lc->lc_sum_irq;
1483                         break;
1484                 case LPROCFS_FIELDS_FLAGS_MIN:
1485                         ret = lc->lc_min;
1486                         break;
1487                 case LPROCFS_FIELDS_FLAGS_MAX:
1488                         ret = lc->lc_max;
1489                         break;
1490                 case LPROCFS_FIELDS_FLAGS_AVG:
1491                         ret = (lc->lc_max - lc->lc_min) / 2;
1492                         break;
1493                 case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
1494                         ret = lc->lc_sumsquare;
1495                         break;
1496                 case LPROCFS_FIELDS_FLAGS_COUNT:
1497                         ret = lc->lc_count;
1498                         break;
1499                 default:
1500                         break;
1501         };
1502         RETURN(ret);
1503 }
1504 EXPORT_SYMBOL(lprocfs_read_helper);
1505
1506 int lprocfs_write_helper(const char __user *buffer, unsigned long count,
1507                          int *val)
1508 {
1509         return lprocfs_write_frac_helper(buffer, count, val, 1);
1510 }
1511 EXPORT_SYMBOL(lprocfs_write_helper);
1512
1513 int lprocfs_write_frac_helper(const char __user *buffer, unsigned long count,
1514                               int *val, int mult)
1515 {
1516         char kernbuf[20], *end, *pbuf;
1517
1518         if (count > (sizeof(kernbuf) - 1))
1519                 return -EINVAL;
1520
1521         if (copy_from_user(kernbuf, buffer, count))
1522                 return -EFAULT;
1523
1524         kernbuf[count] = '\0';
1525         pbuf = kernbuf;
1526         if (*pbuf == '-') {
1527                 mult = -mult;
1528                 pbuf++;
1529         }
1530
1531         *val = (int)simple_strtoul(pbuf, &end, 10) * mult;
1532         if (pbuf == end)
1533                 return -EINVAL;
1534
1535         if (end != NULL && *end == '.') {
1536                 int temp_val, pow = 1;
1537                 int i;
1538
1539                 pbuf = end + 1;
1540                 if (strlen(pbuf) > 5)
1541                         pbuf[5] = '\0'; /*only allow 5bits fractional*/
1542
1543                 temp_val = (int)simple_strtoul(pbuf, &end, 10) * mult;
1544
1545                 if (pbuf < end) {
1546                         for (i = 0; i < (end - pbuf); i++)
1547                                 pow *= 10;
1548
1549                         *val += temp_val / pow;
1550                 }
1551         }
1552         return 0;
1553 }
1554 EXPORT_SYMBOL(lprocfs_write_frac_helper);
1555
1556 int lprocfs_read_frac_helper(char *buffer, unsigned long count, long val,
1557                              int mult)
1558 {
1559         long decimal_val, frac_val;
1560         int prtn;
1561
1562         if (count < 10)
1563                 return -EINVAL;
1564
1565         decimal_val = val / mult;
1566         prtn = snprintf(buffer, count, "%ld", decimal_val);
1567         frac_val = val % mult;
1568
1569         if (prtn < (count - 4) && frac_val > 0) {
1570                 long temp_frac;
1571                 int i, temp_mult = 1, frac_bits = 0;
1572
1573                 temp_frac = frac_val * 10;
1574                 buffer[prtn++] = '.';
1575                 while (frac_bits < 2 && (temp_frac / mult) < 1 ) {
1576                         /* only reserved 2 bits fraction */
1577                         buffer[prtn++] ='0';
1578                         temp_frac *= 10;
1579                         frac_bits++;
1580                 }
1581                 /*
1582                  * Need to think these cases :
1583                  *      1. #echo x.00 > /proc/xxx       output result : x
1584                  *      2. #echo x.0x > /proc/xxx       output result : x.0x
1585                  *      3. #echo x.x0 > /proc/xxx       output result : x.x
1586                  *      4. #echo x.xx > /proc/xxx       output result : x.xx
1587                  *      Only reserved 2 bits fraction.
1588                  */
1589                 for (i = 0; i < (5 - prtn); i++)
1590                         temp_mult *= 10;
1591
1592                 frac_bits = min((int)count - prtn, 3 - frac_bits);
1593                 prtn += snprintf(buffer + prtn, frac_bits, "%ld",
1594                                  frac_val * temp_mult / mult);
1595
1596                 prtn--;
1597                 while(buffer[prtn] < '1' || buffer[prtn] > '9') {
1598                         prtn--;
1599                         if (buffer[prtn] == '.') {
1600                                 prtn--;
1601                                 break;
1602                         }
1603                 }
1604                 prtn++;
1605         }
1606         buffer[prtn++] ='\n';
1607         return prtn;
1608 }
1609
1610 int lprocfs_seq_read_frac_helper(struct seq_file *m, long val, int mult)
1611 {
1612         long decimal_val, frac_val;
1613
1614         decimal_val = val / mult;
1615         seq_printf(m, "%ld", decimal_val);
1616         frac_val = val % mult;
1617
1618         if (frac_val > 0) {
1619                 frac_val *= 100;
1620                 frac_val /= mult;
1621         }
1622         if (frac_val > 0) {
1623                 /* Three cases: x0, xx, 0x */
1624                 if ((frac_val % 10) != 0)
1625                         seq_printf(m, ".%ld", frac_val);
1626                 else
1627                         seq_printf(m, ".%ld", frac_val / 10);
1628         }
1629
1630         seq_printf(m, "\n");
1631         return 0;
1632 }
1633 EXPORT_SYMBOL(lprocfs_seq_read_frac_helper);
1634
1635 int lprocfs_write_u64_helper(const char __user *buffer, unsigned long count,
1636                              __u64 *val)
1637 {
1638         return lprocfs_write_frac_u64_helper(buffer, count, val, 1);
1639 }
1640 EXPORT_SYMBOL(lprocfs_write_u64_helper);
1641
1642 int lprocfs_write_frac_u64_helper(const char __user *buffer,
1643                                   unsigned long count,
1644                                   __u64 *val, int mult)
1645 {
1646         char kernbuf[22], *end, *pbuf;
1647         __u64 whole, frac = 0, units;
1648         unsigned frac_d = 1;
1649
1650         if (count > (sizeof(kernbuf) - 1))
1651                 return -EINVAL;
1652
1653         if (copy_from_user(kernbuf, buffer, count))
1654                 return -EFAULT;
1655
1656         kernbuf[count] = '\0';
1657         pbuf = kernbuf;
1658         if (*pbuf == '-') {
1659                 mult = -mult;
1660                 pbuf++;
1661         }
1662
1663         whole = simple_strtoull(pbuf, &end, 10);
1664         if (pbuf == end)
1665                 return -EINVAL;
1666
1667         if (end != NULL && *end == '.') {
1668                 int i;
1669                 pbuf = end + 1;
1670
1671                 /* need to limit frac_d to a __u32 */
1672                 if (strlen(pbuf) > 10)
1673                         pbuf[10] = '\0';
1674
1675                 frac = simple_strtoull(pbuf, &end, 10);
1676                 /* count decimal places */
1677                 for (i = 0; i < (end - pbuf); i++)
1678                         frac_d *= 10;
1679         }
1680
1681         units = 1;
1682         if (end != NULL) {
1683                 switch (*end) {
1684                 case 'p': case 'P':
1685                         units <<= 10;
1686                 case 't': case 'T':
1687                         units <<= 10;
1688                 case 'g': case 'G':
1689                         units <<= 10;
1690                 case 'm': case 'M':
1691                         units <<= 10;
1692                 case 'k': case 'K':
1693                         units <<= 10;
1694                 }
1695         }
1696         /* Specified units override the multiplier */
1697         if (units > 1)
1698                 mult = mult < 0 ? -units : units;
1699
1700         frac *= mult;
1701         do_div(frac, frac_d);
1702         *val = whole * mult + frac;
1703         return 0;
1704 }
1705 EXPORT_SYMBOL(lprocfs_write_frac_u64_helper);
1706
1707 static char *lprocfs_strnstr(const char *s1, const char *s2, size_t len)
1708 {
1709         size_t l2;
1710
1711         l2 = strlen(s2);
1712         if (!l2)
1713                 return (char *)s1;
1714         while (len >= l2) {
1715                 len--;
1716                 if (!memcmp(s1, s2, l2))
1717                         return (char *)s1;
1718                 s1++;
1719         }
1720         return NULL;
1721 }
1722
1723 /**
1724  * Find the string \a name in the input \a buffer, and return a pointer to the
1725  * value immediately following \a name, reducing \a count appropriately.
1726  * If \a name is not found the original \a buffer is returned.
1727  */
1728 char *lprocfs_find_named_value(const char *buffer, const char *name,
1729                                 size_t *count)
1730 {
1731         char *val;
1732         size_t buflen = *count;
1733
1734         /* there is no strnstr() in rhel5 and ubuntu kernels */
1735         val = lprocfs_strnstr(buffer, name, buflen);
1736         if (val == NULL)
1737                 return (char *)buffer;
1738
1739         val += strlen(name);                             /* skip prefix */
1740         while (val < buffer + buflen && isspace(*val)) /* skip separator */
1741                 val++;
1742
1743         *count = 0;
1744         while (val < buffer + buflen && isalnum(*val)) {
1745                 ++*count;
1746                 ++val;
1747         }
1748
1749         return val - *count;
1750 }
1751 EXPORT_SYMBOL(lprocfs_find_named_value);
1752
1753 int lprocfs_seq_create(struct proc_dir_entry *parent,
1754                        const char *name,
1755                        mode_t mode,
1756                        const struct file_operations *seq_fops,
1757                        void *data)
1758 {
1759         struct proc_dir_entry *entry;
1760         ENTRY;
1761
1762         /* Disallow secretly (un)writable entries. */
1763         LASSERT((seq_fops->write == NULL) == ((mode & 0222) == 0));
1764
1765         entry = proc_create_data(name, mode, parent, seq_fops, data);
1766
1767         if (entry == NULL)
1768                 RETURN(-ENOMEM);
1769
1770         RETURN(0);
1771 }
1772 EXPORT_SYMBOL(lprocfs_seq_create);
1773
1774 int lprocfs_obd_seq_create(struct obd_device *dev,
1775                            const char *name,
1776                            mode_t mode,
1777                            const struct file_operations *seq_fops,
1778                            void *data)
1779 {
1780         return (lprocfs_seq_create(dev->obd_proc_entry, name,
1781                                    mode, seq_fops, data));
1782 }
1783 EXPORT_SYMBOL(lprocfs_obd_seq_create);
1784
1785 void lprocfs_oh_tally(struct obd_histogram *oh, unsigned int value)
1786 {
1787         if (value >= OBD_HIST_MAX)
1788                 value = OBD_HIST_MAX - 1;
1789
1790         spin_lock(&oh->oh_lock);
1791         oh->oh_buckets[value]++;
1792         spin_unlock(&oh->oh_lock);
1793 }
1794 EXPORT_SYMBOL(lprocfs_oh_tally);
1795
1796 void lprocfs_oh_tally_log2(struct obd_histogram *oh, unsigned int value)
1797 {
1798         unsigned int val = 0;
1799
1800         if (likely(value != 0))
1801                 val = min(fls(value - 1), OBD_HIST_MAX);
1802
1803         lprocfs_oh_tally(oh, val);
1804 }
1805 EXPORT_SYMBOL(lprocfs_oh_tally_log2);
1806
1807 unsigned long lprocfs_oh_sum(struct obd_histogram *oh)
1808 {
1809         unsigned long ret = 0;
1810         int i;
1811
1812         for (i = 0; i < OBD_HIST_MAX; i++)
1813                 ret +=  oh->oh_buckets[i];
1814         return ret;
1815 }
1816 EXPORT_SYMBOL(lprocfs_oh_sum);
1817
1818 void lprocfs_oh_clear(struct obd_histogram *oh)
1819 {
1820         spin_lock(&oh->oh_lock);
1821         memset(oh->oh_buckets, 0, sizeof(oh->oh_buckets));
1822         spin_unlock(&oh->oh_lock);
1823 }
1824 EXPORT_SYMBOL(lprocfs_oh_clear);
1825
1826 int lprocfs_obd_rd_max_pages_per_rpc(char *page, char **start, off_t off,
1827                                      int count, int *eof, void *data)
1828 {
1829         struct obd_device *dev = data;
1830         struct client_obd *cli = &dev->u.cli;
1831         int rc;
1832
1833         spin_lock(&cli->cl_loi_list_lock);
1834         rc = snprintf(page, count, "%d\n", cli->cl_max_pages_per_rpc);
1835         spin_unlock(&cli->cl_loi_list_lock);
1836
1837         return rc;
1838 }
1839
1840 int lprocfs_obd_max_pages_per_rpc_seq_show(struct seq_file *m, void *data)
1841 {
1842         struct obd_device *dev = data;
1843         struct client_obd *cli = &dev->u.cli;
1844         int rc;
1845
1846         spin_lock(&cli->cl_loi_list_lock);
1847         rc = seq_printf(m, "%d\n", cli->cl_max_pages_per_rpc);
1848         spin_unlock(&cli->cl_loi_list_lock);
1849         return rc;
1850 }
1851 EXPORT_SYMBOL(lprocfs_obd_max_pages_per_rpc_seq_show);
1852
1853 int lprocfs_wr_root_squash(const char __user *buffer, unsigned long count,
1854                            struct root_squash_info *squash, char *name)
1855 {
1856         int rc;
1857         char kernbuf[64], *tmp, *errmsg;
1858         unsigned long uid, gid;
1859         ENTRY;
1860
1861         if (count >= sizeof(kernbuf)) {
1862                 errmsg = "string too long";
1863                 GOTO(failed_noprint, rc = -EINVAL);
1864         }
1865         if (copy_from_user(kernbuf, buffer, count)) {
1866                 errmsg = "bad address";
1867                 GOTO(failed_noprint, rc = -EFAULT);
1868         }
1869         kernbuf[count] = '\0';
1870
1871         /* look for uid gid separator */
1872         tmp = strchr(kernbuf, ':');
1873         if (tmp == NULL) {
1874                 errmsg = "needs uid:gid format";
1875                 GOTO(failed, rc = -EINVAL);
1876         }
1877         *tmp = '\0';
1878         tmp++;
1879
1880         /* parse uid */
1881         if (kstrtoul(kernbuf, 0, &uid) != 0) {
1882                 errmsg = "bad uid";
1883                 GOTO(failed, rc = -EINVAL);
1884         }
1885
1886         /* parse gid */
1887         if (kstrtoul(tmp, 0, &gid) != 0) {
1888                 errmsg = "bad gid";
1889                 GOTO(failed, rc = -EINVAL);
1890         }
1891
1892         squash->rsi_uid = uid;
1893         squash->rsi_gid = gid;
1894
1895         LCONSOLE_INFO("%s: root_squash is set to %u:%u\n",
1896                       name, squash->rsi_uid, squash->rsi_gid);
1897         RETURN(count);
1898
1899 failed:
1900         if (tmp != NULL) {
1901                 tmp--;
1902                 *tmp = ':';
1903         }
1904         CWARN("%s: failed to set root_squash to \"%s\", %s, rc = %d\n",
1905               name, kernbuf, errmsg, rc);
1906         RETURN(rc);
1907 failed_noprint:
1908         CWARN("%s: failed to set root_squash due to %s, rc = %d\n",
1909               name, errmsg, rc);
1910         RETURN(rc);
1911 }
1912 EXPORT_SYMBOL(lprocfs_wr_root_squash);
1913
1914
1915 int lprocfs_wr_nosquash_nids(const char __user *buffer, unsigned long count,
1916                              struct root_squash_info *squash, char *name)
1917 {
1918         int rc;
1919         char *kernbuf = NULL;
1920         char *errmsg;
1921         struct list_head tmp;
1922         ENTRY;
1923
1924         if (count > 4096) {
1925                 errmsg = "string too long";
1926                 GOTO(failed, rc = -EINVAL);
1927         }
1928
1929         OBD_ALLOC(kernbuf, count + 1);
1930         if (kernbuf == NULL) {
1931                 errmsg = "no memory";
1932                 GOTO(failed, rc = -ENOMEM);
1933         }
1934         if (copy_from_user(kernbuf, buffer, count)) {
1935                 errmsg = "bad address";
1936                 GOTO(failed, rc = -EFAULT);
1937         }
1938         kernbuf[count] = '\0';
1939
1940         if (count > 0 && kernbuf[count - 1] == '\n')
1941                 kernbuf[count - 1] = '\0';
1942
1943         if (strcmp(kernbuf, "NONE") == 0 || strcmp(kernbuf, "clear") == 0) {
1944                 /* empty string is special case */
1945                 down_write(&squash->rsi_sem);
1946                 if (!list_empty(&squash->rsi_nosquash_nids))
1947                         cfs_free_nidlist(&squash->rsi_nosquash_nids);
1948                 up_write(&squash->rsi_sem);
1949                 LCONSOLE_INFO("%s: nosquash_nids is cleared\n", name);
1950                 OBD_FREE(kernbuf, count + 1);
1951                 RETURN(count);
1952         }
1953
1954         INIT_LIST_HEAD(&tmp);
1955         if (cfs_parse_nidlist(kernbuf, count, &tmp) <= 0) {
1956                 errmsg = "can't parse";
1957                 GOTO(failed, rc = -EINVAL);
1958         }
1959         LCONSOLE_INFO("%s: nosquash_nids set to %s\n",
1960                       name, kernbuf);
1961         OBD_FREE(kernbuf, count + 1);
1962         kernbuf = NULL;
1963
1964         down_write(&squash->rsi_sem);
1965         if (!list_empty(&squash->rsi_nosquash_nids))
1966                 cfs_free_nidlist(&squash->rsi_nosquash_nids);
1967         list_splice(&tmp, &squash->rsi_nosquash_nids);
1968         up_write(&squash->rsi_sem);
1969
1970         RETURN(count);
1971
1972 failed:
1973         if (kernbuf) {
1974                 CWARN("%s: failed to set nosquash_nids to \"%s\", %s rc = %d\n",
1975                       name, kernbuf, errmsg, rc);
1976                 OBD_FREE(kernbuf, count + 1);
1977         } else {
1978                 CWARN("%s: failed to set nosquash_nids due to %s rc = %d\n",
1979                       name, errmsg, rc);
1980         }
1981         RETURN(rc);
1982 }
1983 EXPORT_SYMBOL(lprocfs_wr_nosquash_nids);
1984
1985 #endif /* CONFIG_PROC_FS*/