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
  44 #include <obd_class.h>
  45 #include <lprocfs_status.h>
  46 #include <lustre/lustre_idl.h>
  47
  48 #ifdef CONFIG_PROC_FS
  49
  50 static int lprocfs_no_percpu_stats = 0;
  51 CFS_MODULE_PARM(lprocfs_no_percpu_stats, "i", int, 0644,
  52                 "Do not alloc percpu data for lprocfs stats");
  53
  54 #define MAX_STRING_SIZE 128
  55
  56 int lprocfs_single_release(struct inode *inode, struct file *file)
  57 {
  58         return single_release(inode, file);
  59 }
  60 EXPORT_SYMBOL(lprocfs_single_release);
  61
  62 int lprocfs_seq_release(struct inode *inode, struct file *file)
  63 {
  64         return seq_release(inode, file);
  65 }
  66 EXPORT_SYMBOL(lprocfs_seq_release);
  67
  68 struct proc_dir_entry *
  69 lprocfs_add_simple(struct proc_dir_entry *root, char *name,
  70                    void *data, const struct file_operations *fops)
  71 {
  72         struct proc_dir_entry *proc;
  73         mode_t mode = 0;
  74
  75         if (root == NULL || name == NULL || fops == NULL)
  76                 return ERR_PTR(-EINVAL);
  77
  78         if (fops->read)
  79                 mode = 0444;
  80         if (fops->write)
  81                 mode |= 0200;
  82         proc = proc_create_data(name, mode, root, fops, data);
  83         if (!proc) {
  84                 CERROR("LprocFS: No memory to create /proc entry %s\n",
  85                        name);
  86                 return ERR_PTR(-ENOMEM);
  87         }
  88         return proc;
  89 }
  90 EXPORT_SYMBOL(lprocfs_add_simple);
  91
  92 struct proc_dir_entry *lprocfs_add_symlink(const char *name,
  93                         struct proc_dir_entry *parent, const char *format, ...)
  94 {
  95         struct proc_dir_entry *entry;
  96         char *dest;
  97         va_list ap;
  98
  99         if (parent == NULL || format == NULL)
 100                 return NULL;
 101
 102         OBD_ALLOC_WAIT(dest, MAX_STRING_SIZE + 1);
 103         if (dest == NULL)
 104                 return NULL;
 105
 106         va_start(ap, format);
 107         vsnprintf(dest, MAX_STRING_SIZE, format, ap);
 108         va_end(ap);
 109
 110         entry = proc_symlink(name, parent, dest);
 111         if (entry == NULL)
 112                 CERROR("LprocFS: Could not create symbolic link from "
 113                        "%s to %s\n", name, dest);
 114
 115         OBD_FREE(dest, MAX_STRING_SIZE + 1);
 116         return entry;
 117 }
 118 EXPORT_SYMBOL(lprocfs_add_symlink);
 119
 120 #ifdef HAVE_ONLY_PROCFS_SEQ
 121 static const struct file_operations lprocfs_generic_fops = { };
 122 #else
 123
 124 ssize_t
 125 lprocfs_fops_read(struct file *f, char __user *buf, size_t size, loff_t *ppos)
 126 {
 127         struct inode *inode = f->f_dentry->d_inode;
 128         struct proc_dir_entry *dp = PDE(inode);
 129         char *page, *start = NULL;
 130         int rc, eof = 1, count;
 131
 132         if (*ppos >= PAGE_CACHE_SIZE)
 133                 return 0;
 134
 135         page = (char *)__get_free_page(GFP_KERNEL);
 136         if (page == NULL)
 137                 return -ENOMEM;
 138
 139         rc = LPROCFS_ENTRY_CHECK(inode);
 140         if (rc < 0)
 141                 goto out;
 142
 143         OBD_FAIL_TIMEOUT(OBD_FAIL_LPROC_REMOVE, 10);
 144         if (dp->read_proc != NULL)
 145                 rc = dp->read_proc(page, &start, *ppos, PAGE_CACHE_SIZE,
 146                                    &eof, dp->data);
 147         else
 148                 rc = 0;
 149
 150         if (rc <= 0)
 151                 goto out;
 152
 153         /* for lustre proc read, the read count must be less than PAGE_SIZE */
 154         LASSERT(eof == 1);
 155
 156         if (start == NULL) {
 157                 rc -= *ppos;
 158                 if (rc < 0)
 159                         rc = 0;
 160                 if (rc == 0)
 161                         goto out;
 162                 start = page + *ppos;
 163         } else if (start < page) {
 164                 start = page;
 165         }
 166
 167         count = (rc < size) ? rc : size;
 168         if (copy_to_user(buf, start, count)) {
 169                 rc = -EFAULT;
 170                 goto out;
 171         }
 172         *ppos += count;
 173
 174 out:
 175         free_page((unsigned long)page);
 176         return rc;
 177 }
 178
 179 ssize_t
 180 lprocfs_fops_write(struct file *f, const char __user *buf, size_t size,
 181                    loff_t *ppos)
 182 {
 183         struct inode *inode = f->f_dentry->d_inode;
 184         struct proc_dir_entry *dp = PDE(inode);
 185         int rc;
 186
 187         rc = LPROCFS_ENTRY_CHECK(inode);
 188         if (rc < 0)
 189                 return rc;
 190
 191         if (dp->write_proc != NULL)
 192                 rc = dp->write_proc(f, buf, size, dp->data);
 193         else
 194                 rc = -EIO;
 195
 196         return rc;
 197 }
 198
 199 static struct file_operations lprocfs_generic_fops = {
 200         .owner = THIS_MODULE,
 201         .read = lprocfs_fops_read,
 202         .write = lprocfs_fops_write,
 203 };
 204
 205 /* for b=10866, global variable */
 206 DECLARE_RWSEM(_lprocfs_lock);
 207 EXPORT_SYMBOL(_lprocfs_lock);
 208
 209 static struct proc_dir_entry *__lprocfs_srch(struct proc_dir_entry *head,
 210                                              const char *name)
 211 {
 212         struct proc_dir_entry *temp;
 213
 214         if (head == NULL)
 215                 return NULL;
 216
 217         temp = head->subdir;
 218         while (temp != NULL) {
 219                 if (strcmp(temp->name, name) == 0)
 220                         return temp;
 221                 temp = temp->next;
 222         }
 223         return NULL;
 224 }
 225
 226 struct proc_dir_entry *lprocfs_srch(struct proc_dir_entry *head,
 227                                     const char *name)
 228 {
 229         struct proc_dir_entry *temp;
 230
 231         LPROCFS_SRCH_ENTRY();
 232         temp = __lprocfs_srch(head, name);
 233         LPROCFS_SRCH_EXIT();
 234         return temp;
 235 }
 236 EXPORT_SYMBOL(lprocfs_srch);
 237
 238 static int __lprocfs_add_vars(struct proc_dir_entry *root,
 239                               struct lprocfs_vars *list,
 240                               void *data)
 241 {
 242         int rc = 0;
 243
 244         if (root == NULL || list == NULL)
 245                 return -EINVAL;
 246
 247         while (list->name != NULL) {
 248                 struct proc_dir_entry *cur_root, *proc;
 249                 char *pathcopy, *cur, *next, pathbuf[64];
 250                 int pathsize = strlen(list->name) + 1;
 251
 252                 proc = NULL;
 253                 cur_root = root;
 254
 255                 /* need copy of path for strsep */
 256                 if (strlen(list->name) > sizeof(pathbuf) - 1) {
 257                         OBD_ALLOC(pathcopy, pathsize);
 258                         if (pathcopy == NULL)
 259                                 GOTO(out, rc = -ENOMEM);
 260                 } else {
 261                         pathcopy = pathbuf;
 262                 }
 263
 264                 next = pathcopy;
 265                 strcpy(pathcopy, list->name);
 266
 267                 while (cur_root != NULL && (cur = strsep(&next, "/"))) {
 268                         if (*cur =='\0') /* skip double/trailing "/" */
 269                                 continue;
 270
 271                         proc = __lprocfs_srch(cur_root, cur);
 272                         CDEBUG(D_OTHER, "cur_root=%s, cur=%s, next=%s, (%s)\n",
 273                                cur_root->name, cur, next,
 274                                (proc ? "exists" : "new"));
 275                         if (next != NULL) {
 276                                 cur_root = (proc ? proc :
 277                                             proc_mkdir(cur, cur_root));
 278                         } else if (proc == NULL) {
 279                                 mode_t mode = 0;
 280                                 if (list->proc_mode != 0000) {
 281                                         mode = list->proc_mode;
 282                                 } else {
 283                                         if (list->read_fptr)
 284                                                 mode = 0444;
 285                                         if (list->write_fptr)
 286                                                 mode |= 0200;
 287                                 }
 288                                 proc = create_proc_entry(cur, mode, cur_root);
 289                         }
 290                 }
 291
 292                 if (pathcopy != pathbuf)
 293                         OBD_FREE(pathcopy, pathsize);
 294
 295                 if (cur_root == NULL || proc == NULL) {
 296                         CERROR("LprocFS: No memory to create /proc entry %s\n",
 297                                list->name);
 298                         GOTO(out, rc = -ENOMEM);
 299                 }
 300
 301                 if (list->fops)
 302                         proc->proc_fops = list->fops;
 303                 else
 304                         proc->proc_fops = &lprocfs_generic_fops;
 305                 proc->read_proc = list->read_fptr;
 306                 proc->write_proc = list->write_fptr;
 307                 proc->data = (list->data ? list->data : data);
 308                 list++;
 309         }
 310 out:
 311         return rc;
 312 }
 313
 314 int lprocfs_add_vars(struct proc_dir_entry *root, struct lprocfs_vars *list,
 315                      void *data)
 316 {
 317         int rc = 0;
 318
 319         LPROCFS_WRITE_ENTRY();
 320         rc = __lprocfs_add_vars(root, list, data);
 321         LPROCFS_WRITE_EXIT();
 322
 323         return rc;
 324 }
 325 EXPORT_SYMBOL(lprocfs_add_vars);
 326 #endif
 327
 328 /**
 329  * Add /proc entries.
 330  *
 331  * \param root [in]  The parent proc entry on which new entry will be added.
 332  * \param list [in]  Array of proc entries to be added.
 333  * \param data [in]  The argument to be passed when entries read/write routines
 334  *                   are called through /proc file.
 335  *
 336  * \retval 0   on success
 337  *         < 0 on error
 338  */
 339 int
 340 lprocfs_seq_add_vars(struct proc_dir_entry *root, struct lprocfs_seq_vars *list,
 341                      void *data)
 342 {
 343         if (root == NULL || list == NULL)
 344                 return -EINVAL;
 345
 346         while (list->name != NULL) {
 347                 struct proc_dir_entry *proc;
 348                 mode_t mode = 0;
 349
 350                 if (list->proc_mode != 0000) {
 351                         mode = list->proc_mode;
 352                 } else if (list->fops) {
 353                         if (list->fops->read)
 354                                 mode = 0444;
 355                         if (list->fops->write)
 356                                 mode |= 0200;
 357                 }
 358                 proc = proc_create_data(list->name, mode, root,
 359                                         list->fops ?: &lprocfs_generic_fops,
 360                                         list->data ?: data);
 361                 if (proc == NULL)
 362                         return -ENOMEM;
 363                 list++;
 364         }
 365         return 0;
 366 }
 367 EXPORT_SYMBOL(lprocfs_seq_add_vars);
 368
 369 #ifndef HAVE_ONLY_PROCFS_SEQ
 370 static void lprocfs_remove_nolock(struct proc_dir_entry **proot)
 371 {
 372         struct proc_dir_entry *root = *proot;
 373         struct proc_dir_entry *temp = root;
 374         struct proc_dir_entry *rm_entry;
 375         struct proc_dir_entry *parent;
 376
 377         *proot = NULL;
 378         if (root == NULL || IS_ERR(root))
 379                 return;
 380
 381         parent = root->parent;
 382         LASSERT(parent != NULL);
 383
 384         while (1) {
 385                 while (temp->subdir != NULL)
 386                         temp = temp->subdir;
 387
 388                 rm_entry = temp;
 389                 temp = temp->parent;
 390
 391                 /* Memory corruption once caused this to fail, and
 392                    without this LASSERT we would loop here forever. */
 393                 LASSERTF(strlen(rm_entry->name) == rm_entry->namelen,
 394                          "0x%p  %s/%s len %d\n", rm_entry, temp->name,
 395                          rm_entry->name, (int)strlen(rm_entry->name));
 396
 397                 remove_proc_entry(rm_entry->name, temp);
 398                 if (temp == parent)
 399                         break;
 400         }
 401 }
 402 #endif
 403
 404 void lprocfs_remove(struct proc_dir_entry **rooth)
 405 {
 406 #ifndef HAVE_ONLY_PROCFS_SEQ
 407         LPROCFS_WRITE_ENTRY(); /* search vs remove race */
 408         lprocfs_remove_nolock(rooth);
 409         LPROCFS_WRITE_EXIT();
 410 #else
 411         proc_remove(*rooth);
 412         *rooth = NULL;
 413 #endif
 414 }
 415 EXPORT_SYMBOL(lprocfs_remove);
 416
 417 void lprocfs_remove_proc_entry(const char *name, struct proc_dir_entry *parent)
 418 {
 419         LASSERT(parent != NULL);
 420         remove_proc_entry(name, parent);
 421 }
 422 EXPORT_SYMBOL(lprocfs_remove_proc_entry);
 423
 424 #ifndef HAVE_ONLY_PROCFS_SEQ
 425 void lprocfs_try_remove_proc_entry(const char *name,
 426                                    struct proc_dir_entry *parent)
 427 {
 428         struct proc_dir_entry    *t = NULL;
 429         struct proc_dir_entry   **p;
 430         int                       len, busy = 0;
 431
 432         LASSERT(parent != NULL);
 433         len = strlen(name);
 434
 435         LPROCFS_WRITE_ENTRY();
 436
 437         /* lookup target name */
 438         for (p = &parent->subdir; *p; p = &(*p)->next) {
 439                 if ((*p)->namelen != len)
 440                         continue;
 441                 if (memcmp(name, (*p)->name, len))
 442                         continue;
 443                 t = *p;
 444                 break;
 445         }
 446
 447         if (t) {
 448                 /* verify it's empty: do not count "num_refs" */
 449                 for (p = &t->subdir; *p; p = &(*p)->next) {
 450                         if ((*p)->namelen != strlen("num_refs")) {
 451                                 busy = 1;
 452                                 break;
 453                         }
 454                         if (memcmp("num_refs", (*p)->name,
 455                                    strlen("num_refs"))) {
 456                                 busy = 1;
 457                                 break;
 458                         }
 459                 }
 460         }
 461
 462         if (busy == 0)
 463                 lprocfs_remove_nolock(&t);
 464
 465         LPROCFS_WRITE_EXIT();
 466
 467         return;
 468 }
 469 EXPORT_SYMBOL(lprocfs_try_remove_proc_entry);
 470
 471 struct proc_dir_entry *lprocfs_register(const char *name,
 472                                         struct proc_dir_entry *parent,
 473                                         struct lprocfs_vars *list, void *data)
 474 {
 475         struct proc_dir_entry *entry;
 476         int rc;
 477
 478         LPROCFS_WRITE_ENTRY();
 479         entry = __lprocfs_srch(parent, name);
 480         if (entry != NULL) {
 481                 CERROR("entry '%s' already registered\n", name);
 482                 GOTO(out, entry = ERR_PTR(-EALREADY));
 483         }
 484
 485         entry = proc_mkdir(name, parent);
 486         if (entry == NULL)
 487                 GOTO(out, entry = ERR_PTR(-ENOMEM));
 488
 489         if (list != NULL) {
 490                 rc = __lprocfs_add_vars(entry, list, data);
 491                 if (rc != 0) {
 492                         lprocfs_remove_nolock(&entry);
 493                         GOTO(out, entry = ERR_PTR(rc));
 494                 }
 495         }
 496 out:
 497         LPROCFS_WRITE_EXIT();
 498         return entry;
 499 }
 500 EXPORT_SYMBOL(lprocfs_register);
 501 #endif
 502
 503 struct proc_dir_entry *
 504 lprocfs_seq_register(const char *name, struct proc_dir_entry *parent,
 505                      struct lprocfs_seq_vars *list, void *data)
 506 {
 507         struct proc_dir_entry *newchild;
 508
 509         newchild = proc_mkdir(name, parent);
 510         if (newchild == NULL)
 511                 return ERR_PTR(-ENOMEM);
 512
 513         if (list != NULL) {
 514                 int rc = lprocfs_seq_add_vars(newchild, list, data);
 515                 if (rc) {
 516                         lprocfs_remove(&newchild);
 517                         return ERR_PTR(rc);
 518                 }
 519         }
 520         return newchild;
 521 }
 522 EXPORT_SYMBOL(lprocfs_seq_register);
 523
 524 /* Generic callbacks */
 525 int lprocfs_uint_seq_show(struct seq_file *m, void *data)
 526 {
 527         return seq_printf(m, "%u\n", *(unsigned int *)data);
 528 }
 529 EXPORT_SYMBOL(lprocfs_uint_seq_show);
 530
 531 int lprocfs_wr_uint(struct file *file, const char __user *buffer,
 532                     unsigned long count, void *data)
 533 {
 534         unsigned *p = data;
 535         char dummy[MAX_STRING_SIZE + 1], *end;
 536         unsigned long tmp;
 537
 538         dummy[MAX_STRING_SIZE] = '\0';
 539         if (copy_from_user(dummy, buffer, MAX_STRING_SIZE))
 540                 return -EFAULT;
 541
 542         tmp = simple_strtoul(dummy, &end, 0);
 543         if (dummy == end)
 544                 return -EINVAL;
 545
 546         *p = (unsigned int)tmp;
 547         return count;
 548 }
 549 EXPORT_SYMBOL(lprocfs_wr_uint);
 550
 551 ssize_t lprocfs_uint_seq_write(struct file *file, const char __user *buffer,
 552                                size_t count, loff_t *off)
 553 {
 554         int *data = ((struct seq_file *)file->private_data)->private;
 555         int val = 0, rc;
 556
 557         rc = lprocfs_write_helper(buffer, count, &val);
 558         if (rc < 0)
 559                 return rc;
 560
 561         return lprocfs_wr_uint(file, buffer, count, data);
 562 }
 563 EXPORT_SYMBOL(lprocfs_uint_seq_write);
 564
 565 int lprocfs_u64_seq_show(struct seq_file *m, void *data)
 566 {
 567         LASSERT(data != NULL);
 568         return seq_printf(m, LPU64"\n", *(__u64 *)data);
 569 }
 570 EXPORT_SYMBOL(lprocfs_u64_seq_show);
 571
 572 int lprocfs_atomic_seq_show(struct seq_file *m, void *data)
 573 {
 574         atomic_t *atom = data;
 575         LASSERT(atom != NULL);
 576         return seq_printf(m, "%d\n", atomic_read(atom));
 577 }
 578 EXPORT_SYMBOL(lprocfs_atomic_seq_show);
 579
 580 ssize_t
 581 lprocfs_atomic_seq_write(struct file *file, const char __user *buffer,
 582                         size_t count, loff_t *off)
 583 {
 584         atomic_t *atm = ((struct seq_file *)file->private_data)->private;
 585         int val = 0;
 586         int rc;
 587
 588         rc = lprocfs_write_helper(buffer, count, &val);
 589         if (rc < 0)
 590                 return rc;
 591
 592         if (val <= 0)
 593                 return -ERANGE;
 594
 595         atomic_set(atm, val);
 596         return count;
 597 }
 598 EXPORT_SYMBOL(lprocfs_atomic_seq_write);
 599
 600 int lprocfs_uuid_seq_show(struct seq_file *m, void *data)
 601 {
 602         struct obd_device *obd = data;
 603
 604         LASSERT(obd != NULL);
 605         return seq_printf(m, "%s\n", obd->obd_uuid.uuid);
 606 }
 607 EXPORT_SYMBOL(lprocfs_uuid_seq_show);
 608
 609 int lprocfs_name_seq_show(struct seq_file *m, void *data)
 610 {
 611         struct obd_device *dev = data;
 612
 613         LASSERT(dev != NULL);
 614         return seq_printf(m, "%s\n", dev->obd_name);
 615 }
 616 EXPORT_SYMBOL(lprocfs_name_seq_show);
 617
 618 int lprocfs_blksize_seq_show(struct seq_file *m, void *data)
 619 {
 620         struct obd_device *obd = data;
 621         struct obd_statfs  osfs;
 622         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 623                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 624                             OBD_STATFS_NODELAY);
 625         if (!rc)
 626                 rc = seq_printf(m, "%u\n", osfs.os_bsize);
 627         return rc;
 628 }
 629 EXPORT_SYMBOL(lprocfs_blksize_seq_show);
 630
 631 int lprocfs_kbytestotal_seq_show(struct seq_file *m, void *data)
 632 {
 633         struct obd_device *obd = data;
 634         struct obd_statfs  osfs;
 635         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 636                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 637                             OBD_STATFS_NODELAY);
 638         if (!rc) {
 639                 __u32 blk_size = osfs.os_bsize >> 10;
 640                 __u64 result = osfs.os_blocks;
 641
 642                 while (blk_size >>= 1)
 643                         result <<= 1;
 644
 645                 rc = seq_printf(m, LPU64"\n", result);
 646         }
 647         return rc;
 648 }
 649 EXPORT_SYMBOL(lprocfs_kbytestotal_seq_show);
 650
 651 int lprocfs_kbytesfree_seq_show(struct seq_file *m, void *data)
 652 {
 653         struct obd_device *obd = data;
 654         struct obd_statfs  osfs;
 655         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 656                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 657                             OBD_STATFS_NODELAY);
 658         if (!rc) {
 659                 __u32 blk_size = osfs.os_bsize >> 10;
 660                 __u64 result = osfs.os_bfree;
 661
 662                 while (blk_size >>= 1)
 663                         result <<= 1;
 664
 665                 rc = seq_printf(m, LPU64"\n", result);
 666         }
 667         return rc;
 668 }
 669 EXPORT_SYMBOL(lprocfs_kbytesfree_seq_show);
 670
 671 int lprocfs_kbytesavail_seq_show(struct seq_file *m, void *data)
 672 {
 673         struct obd_device *obd = data;
 674         struct obd_statfs  osfs;
 675         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 676                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 677                             OBD_STATFS_NODELAY);
 678         if (!rc) {
 679                 __u32 blk_size = osfs.os_bsize >> 10;
 680                 __u64 result = osfs.os_bavail;
 681
 682                 while (blk_size >>= 1)
 683                         result <<= 1;
 684
 685                 rc = seq_printf(m, LPU64"\n", result);
 686         }
 687         return rc;
 688 }
 689 EXPORT_SYMBOL(lprocfs_kbytesavail_seq_show);
 690
 691 int lprocfs_filestotal_seq_show(struct seq_file *m, void *data)
 692 {
 693         struct obd_device *obd = data;
 694         struct obd_statfs  osfs;
 695         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 696                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 697                             OBD_STATFS_NODELAY);
 698         if (!rc)
 699                 rc = seq_printf(m, LPU64"\n", osfs.os_files);
 700         return rc;
 701 }
 702 EXPORT_SYMBOL(lprocfs_filestotal_seq_show);
 703
 704 int lprocfs_filesfree_seq_show(struct seq_file *m, void *data)
 705 {
 706         struct obd_device *obd = data;
 707         struct obd_statfs  osfs;
 708         int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
 709                             cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 710                             OBD_STATFS_NODELAY);
 711         if (!rc)
 712                 rc = seq_printf(m, LPU64"\n", osfs.os_ffree);
 713         return rc;
 714 }
 715 EXPORT_SYMBOL(lprocfs_filesfree_seq_show);
 716
 717 int lprocfs_server_uuid_seq_show(struct seq_file *m, void *data)
 718 {
 719         struct obd_device *obd = data;
 720         struct obd_import *imp;
 721         char *imp_state_name = NULL;
 722         int rc = 0;
 723
 724         LASSERT(obd != NULL);
 725         LPROCFS_CLIMP_CHECK(obd);
 726         imp = obd->u.cli.cl_import;
 727         imp_state_name = ptlrpc_import_state_name(imp->imp_state);
 728         rc = seq_printf(m, "%s\t%s%s\n", obd2cli_tgt(obd), imp_state_name,
 729                         imp->imp_deactive ? "\tDEACTIVATED" : "");
 730
 731         LPROCFS_CLIMP_EXIT(obd);
 732         return rc;
 733 }
 734 EXPORT_SYMBOL(lprocfs_server_uuid_seq_show);
 735
 736 int lprocfs_conn_uuid_seq_show(struct seq_file *m, void *data)
 737 {
 738         struct obd_device *obd = data;
 739         struct ptlrpc_connection *conn;
 740         int rc = 0;
 741
 742         LASSERT(obd != NULL);
 743
 744         LPROCFS_CLIMP_CHECK(obd);
 745         conn = obd->u.cli.cl_import->imp_connection;
 746         if (conn && obd->u.cli.cl_import)
 747                 rc = seq_printf(m, "%s\n", conn->c_remote_uuid.uuid);
 748         else
 749                 rc = seq_printf(m, "%s\n", "<none>");
 750
 751         LPROCFS_CLIMP_EXIT(obd);
 752         return rc;
 753 }
 754 EXPORT_SYMBOL(lprocfs_conn_uuid_seq_show);
 755
 756 /** add up per-cpu counters */
 757 void lprocfs_stats_collect(struct lprocfs_stats *stats, int idx,
 758                            struct lprocfs_counter *cnt)
 759 {
 760         unsigned int                    num_entry;
 761         struct lprocfs_counter          *percpu_cntr;
 762         int                             i;
 763         unsigned long                   flags = 0;
 764
 765         memset(cnt, 0, sizeof(*cnt));
 766
 767         if (stats == NULL) {
 768                 /* set count to 1 to avoid divide-by-zero errs in callers */
 769                 cnt->lc_count = 1;
 770                 return;
 771         }
 772
 773         cnt->lc_min = LC_MIN_INIT;
 774
 775         num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
 776
 777         for (i = 0; i < num_entry; i++) {
 778                 if (stats->ls_percpu[i] == NULL)
 779                         continue;
 780                 percpu_cntr = lprocfs_stats_counter_get(stats, i, idx);
 781
 782                 cnt->lc_count += percpu_cntr->lc_count;
 783                 cnt->lc_sum += percpu_cntr->lc_sum;
 784                 if (percpu_cntr->lc_min < cnt->lc_min)
 785                         cnt->lc_min = percpu_cntr->lc_min;
 786                 if (percpu_cntr->lc_max > cnt->lc_max)
 787                         cnt->lc_max = percpu_cntr->lc_max;
 788                 cnt->lc_sumsquare += percpu_cntr->lc_sumsquare;
 789         }
 790
 791         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
 792 }
 793 EXPORT_SYMBOL(lprocfs_stats_collect);
 794
 795 /**
 796  * Append a space separated list of current set flags to str.
 797  */
 798 #define flag2str(flag)                                          \
 799         do {                                                            \
 800                 if (imp->imp_##flag) {                                  \
 801                         seq_printf(m, "%s" #flag, first ? "" : ", ");   \
 802                         first = false;                                  \
 803                 }                                                       \
 804         } while (0)
 805 static void obd_import_flags2str(struct obd_import *imp, struct seq_file *m)
 806 {
 807         bool first = true;
 808
 809         if (imp->imp_obd->obd_no_recov) {
 810                 seq_printf(m, "no_recov");
 811                 first = false;
 812         }
 813
 814         flag2str(invalid);
 815         flag2str(deactive);
 816         flag2str(replayable);
 817         flag2str(delayed_recovery);
 818         flag2str(no_lock_replay);
 819         flag2str(vbr_failed);
 820         flag2str(pingable);
 821         flag2str(resend_replay);
 822         flag2str(no_pinger_recover);
 823         flag2str(need_mne_swab);
 824         flag2str(connect_tried);
 825 }
 826 #undef flag2str
 827
 828 static const char *obd_connect_names[] = {
 829         "read_only",
 830         "lov_index",
 831         "connect_from_mds",
 832         "write_grant",
 833         "server_lock",
 834         "version",
 835         "request_portal",
 836         "acl",
 837         "xattr",
 838         "create_on_write",
 839         "truncate_lock",
 840         "initial_transno",
 841         "inode_bit_locks",
 842         "join_file(obsolete)",
 843         "getattr_by_fid",
 844         "no_oh_for_devices",
 845         "remote_client",
 846         "remote_client_by_force",
 847         "max_byte_per_rpc",
 848         "64bit_qdata",
 849         "mds_capability",
 850         "oss_capability",
 851         "early_lock_cancel",
 852         "som",
 853         "adaptive_timeouts",
 854         "lru_resize",
 855         "mds_mds_connection",
 856         "real_conn",
 857         "change_qunit_size",
 858         "alt_checksum_algorithm",
 859         "fid_is_enabled",
 860         "version_recovery",
 861         "pools",
 862         "grant_shrink",
 863         "skip_orphan",
 864         "large_ea",
 865         "full20",
 866         "layout_lock",
 867         "64bithash",
 868         "object_max_bytes",
 869         "imp_recov",
 870         "jobstats",
 871         "umask",
 872         "einprogress",
 873         "grant_param",
 874         "flock_owner",
 875         "lvb_type",
 876         "nanoseconds_times",
 877         "lightweight_conn",
 878         "short_io",
 879         "pingless",
 880         "flock_deadlock",
 881         "disp_stripe",
 882         "open_by_fid",
 883         "lfsck",
 884         "unknown",
 885         "unlink_close",
 886         "unknown",
 887         "dir_stripe",
 888         "unknown",
 889         NULL
 890 };
 891
 892 static void obd_connect_seq_flags2str(struct seq_file *m, __u64 flags, char *sep)
 893 {
 894         bool first = true;
 895         __u64 mask = 1;
 896         int i;
 897
 898         for (i = 0; obd_connect_names[i] != NULL; i++, mask <<= 1) {
 899                 if (flags & mask) {
 900                         seq_printf(m, "%s%s",
 901                                    first ? "" : sep, obd_connect_names[i]);
 902                         first = false;
 903                 }
 904         }
 905         if (flags & ~(mask - 1))
 906                 seq_printf(m, "%sunknown_"LPX64,
 907                            first ? "" : sep, flags & ~(mask - 1));
 908 }
 909
 910 int obd_connect_flags2str(char *page, int count, __u64 flags, char *sep)
 911 {
 912         __u64 mask = 1;
 913         int i, ret = 0;
 914
 915         for (i = 0; obd_connect_names[i] != NULL; i++, mask <<= 1) {
 916                 if (flags & mask)
 917                         ret += snprintf(page + ret, count - ret, "%s%s",
 918                                         ret ? sep : "", obd_connect_names[i]);
 919         }
 920         if (flags & ~(mask - 1))
 921                 ret += snprintf(page + ret, count - ret,
 922                                 "%sunknown_"LPX64,
 923                                 ret ? sep : "", flags & ~(mask - 1));
 924         return ret;
 925 }
 926 EXPORT_SYMBOL(obd_connect_flags2str);
 927
 928 static void obd_connect_data_seqprint(struct seq_file *m,
 929                                       struct obd_connect_data *ocd)
 930 {
 931         int flags;
 932
 933         LASSERT(ocd != NULL);
 934         flags = ocd->ocd_connect_flags;
 935
 936         seq_printf(m, "    connect_data:\n"
 937                       "       flags: "LPX64"\n"
 938                       "       instance: %u\n",
 939                       ocd->ocd_connect_flags,
 940                       ocd->ocd_instance);
 941         if (flags & OBD_CONNECT_VERSION)
 942                 seq_printf(m, "       target_version: %u.%u.%u.%u\n",
 943                               OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 944                               OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 945                               OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 946                               OBD_OCD_VERSION_FIX(ocd->ocd_version));
 947         if (flags & OBD_CONNECT_MDS)
 948                 seq_printf(m, "       mdt_index: %d\n", ocd->ocd_group);
 949         if (flags & OBD_CONNECT_GRANT)
 950                 seq_printf(m, "       initial_grant: %d\n", ocd->ocd_grant);
 951         if (flags & OBD_CONNECT_INDEX)
 952                 seq_printf(m, "       target_index: %u\n", ocd->ocd_index);
 953         if (flags & OBD_CONNECT_BRW_SIZE)
 954                 seq_printf(m, "       max_brw_size: %d\n", ocd->ocd_brw_size);
 955         if (flags & OBD_CONNECT_IBITS)
 956                 seq_printf(m, "       ibits_known: "LPX64"\n",
 957                                 ocd->ocd_ibits_known);
 958         if (flags & OBD_CONNECT_GRANT_PARAM)
 959                 seq_printf(m, "       grant_block_size: %d\n"
 960                               "       grant_inode_size: %d\n"
 961                               "       grant_extent_overhead: %d\n",
 962                               ocd->ocd_blocksize,
 963                               ocd->ocd_inodespace,
 964                               ocd->ocd_grant_extent);
 965         if (flags & OBD_CONNECT_TRANSNO)
 966                 seq_printf(m, "       first_transno: "LPX64"\n",
 967                                 ocd->ocd_transno);
 968         if (flags & OBD_CONNECT_CKSUM)
 969                 seq_printf(m, "       cksum_types: %#x\n",
 970                               ocd->ocd_cksum_types);
 971         if (flags & OBD_CONNECT_MAX_EASIZE)
 972                 seq_printf(m, "       max_easize: %d\n", ocd->ocd_max_easize);
 973         if (flags & OBD_CONNECT_MAXBYTES)
 974                 seq_printf(m, "       max_object_bytes: "LPU64"\n",
 975                               ocd->ocd_maxbytes);
 976 }
 977
 978 int lprocfs_import_seq_show(struct seq_file *m, void *data)
 979 {
 980         struct lprocfs_counter          ret;
 981         struct lprocfs_counter_header   *header;
 982         struct obd_device               *obd    = (struct obd_device *)data;
 983         struct obd_import               *imp;
 984         struct obd_import_conn          *conn;
 985         struct obd_connect_data         *ocd;
 986         int                             j;
 987         int                             k;
 988         int                             rw      = 0;
 989
 990         LASSERT(obd != NULL);
 991         LPROCFS_CLIMP_CHECK(obd);
 992         imp = obd->u.cli.cl_import;
 993         ocd = &imp->imp_connect_data;
 994
 995         seq_printf(m, "import:\n"
 996                       "    name: %s\n"
 997                       "    target: %s\n"
 998                       "    state: %s\n"
 999                       "    connect_flags: [ ",
1000                       obd->obd_name,
1001                       obd2cli_tgt(obd),
1002                       ptlrpc_import_state_name(imp->imp_state));
1003         obd_connect_seq_flags2str(m, imp->imp_connect_data.ocd_connect_flags,
1004                                         ", ");
1005         seq_printf(m, " ]\n");
1006         obd_connect_data_seqprint(m, ocd);
1007         seq_printf(m, "    import_flags: [ ");
1008         obd_import_flags2str(imp, m);
1009
1010         seq_printf(m, " ]\n"
1011                       "    connection:\n"
1012                       "       failover_nids: [ ");
1013         spin_lock(&imp->imp_lock);
1014         j = 0;
1015         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
1016                 seq_printf(m, "%s%s", j ? ", " : "",
1017                            libcfs_nid2str(conn->oic_conn->c_peer.nid));
1018                 j++;
1019         }
1020         seq_printf(m, " ]\n"
1021                       "       current_connection: %s\n"
1022                       "       connection_attempts: %u\n"
1023                       "       generation: %u\n"
1024                       "       in-progress_invalidations: %u\n",
1025                       imp->imp_connection == NULL ? "<none>" :
1026                               libcfs_nid2str(imp->imp_connection->c_peer.nid),
1027                       imp->imp_conn_cnt,
1028                       imp->imp_generation,
1029                       atomic_read(&imp->imp_inval_count));
1030         spin_unlock(&imp->imp_lock);
1031
1032         if (obd->obd_svc_stats == NULL)
1033                 goto out_climp;
1034
1035         header = &obd->obd_svc_stats->ls_cnt_header[PTLRPC_REQWAIT_CNTR];
1036         lprocfs_stats_collect(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR, &ret);
1037         if (ret.lc_count != 0) {
1038                 /* first argument to do_div MUST be __u64 */
1039                 __u64 sum = ret.lc_sum;
1040                 do_div(sum, ret.lc_count);
1041                 ret.lc_sum = sum;
1042         } else
1043                 ret.lc_sum = 0;
1044         seq_printf(m, "    rpcs:\n"
1045                       "       inflight: %u\n"
1046                       "       unregistering: %u\n"
1047                       "       timeouts: %u\n"
1048                       "       avg_waittime: "LPU64" %s\n",
1049                       atomic_read(&imp->imp_inflight),
1050                       atomic_read(&imp->imp_unregistering),
1051                       atomic_read(&imp->imp_timeouts),
1052                       ret.lc_sum, header->lc_units);
1053
1054         k = 0;
1055         for(j = 0; j < IMP_AT_MAX_PORTALS; j++) {
1056                 if (imp->imp_at.iat_portal[j] == 0)
1057                         break;
1058                 k = max_t(unsigned int, k,
1059                           at_get(&imp->imp_at.iat_service_estimate[j]));
1060         }
1061         seq_printf(m, "    service_estimates:\n"
1062                       "       services: %u sec\n"
1063                       "       network: %u sec\n",
1064                       k,
1065                       at_get(&imp->imp_at.iat_net_latency));
1066
1067         seq_printf(m, "    transactions:\n"
1068                       "       last_replay: "LPU64"\n"
1069                       "       peer_committed: "LPU64"\n"
1070                       "       last_checked: "LPU64"\n",
1071                       imp->imp_last_replay_transno,
1072                       imp->imp_peer_committed_transno,
1073                       imp->imp_last_transno_checked);
1074
1075         /* avg data rates */
1076         for (rw = 0; rw <= 1; rw++) {
1077                 lprocfs_stats_collect(obd->obd_svc_stats,
1078                                       PTLRPC_LAST_CNTR + BRW_READ_BYTES + rw,
1079                                       &ret);
1080                 if (ret.lc_sum > 0 && ret.lc_count > 0) {
1081                         /* first argument to do_div MUST be __u64 */
1082                         __u64 sum = ret.lc_sum;
1083                         do_div(sum, ret.lc_count);
1084                         ret.lc_sum = sum;
1085                         seq_printf(m, "    %s_data_averages:\n"
1086                                       "       bytes_per_rpc: "LPU64"\n",
1087                                       rw ? "write" : "read",
1088                                       ret.lc_sum);
1089                 }
1090                 k = (int)ret.lc_sum;
1091                 j = opcode_offset(OST_READ + rw) + EXTRA_MAX_OPCODES;
1092                 header = &obd->obd_svc_stats->ls_cnt_header[j];
1093                 lprocfs_stats_collect(obd->obd_svc_stats, j, &ret);
1094                 if (ret.lc_sum > 0 && ret.lc_count != 0) {
1095                         /* first argument to do_div MUST be __u64 */
1096                         __u64 sum = ret.lc_sum;
1097                         do_div(sum, ret.lc_count);
1098                         ret.lc_sum = sum;
1099                         seq_printf(m, "       %s_per_rpc: "LPU64"\n",
1100                                         header->lc_units, ret.lc_sum);
1101                         j = (int)ret.lc_sum;
1102                         if (j > 0)
1103                                 seq_printf(m, "       MB_per_sec: %u.%.02u\n",
1104                                                 k / j, (100 * k / j) % 100);
1105                 }
1106         }
1107
1108 out_climp:
1109         LPROCFS_CLIMP_EXIT(obd);
1110         return 0;
1111 }
1112 EXPORT_SYMBOL(lprocfs_import_seq_show);
1113
1114 int lprocfs_state_seq_show(struct seq_file *m, void *data)
1115 {
1116         struct obd_device *obd = (struct obd_device *)data;
1117         struct obd_import *imp;
1118         int j, k;
1119
1120         LASSERT(obd != NULL);
1121         LPROCFS_CLIMP_CHECK(obd);
1122         imp = obd->u.cli.cl_import;
1123
1124         seq_printf(m, "current_state: %s\n",
1125                    ptlrpc_import_state_name(imp->imp_state));
1126         seq_printf(m, "state_history:\n");
1127         k = imp->imp_state_hist_idx;
1128         for (j = 0; j < IMP_STATE_HIST_LEN; j++) {
1129                 struct import_state_hist *ish =
1130                         &imp->imp_state_hist[(k + j) % IMP_STATE_HIST_LEN];
1131                 if (ish->ish_state == 0)
1132                         continue;
1133                 seq_printf(m, " - [ "CFS_TIME_T", %s ]\n",
1134                            ish->ish_time,
1135                 ptlrpc_import_state_name(ish->ish_state));
1136         }
1137
1138         LPROCFS_CLIMP_EXIT(obd);
1139         return 0;
1140 }
1141 EXPORT_SYMBOL(lprocfs_state_seq_show);
1142
1143 int lprocfs_seq_at_hist_helper(struct seq_file *m, struct adaptive_timeout *at)
1144 {
1145         int i;
1146         for (i = 0; i < AT_BINS; i++)
1147                 seq_printf(m, "%3u ", at->at_hist[i]);
1148         seq_printf(m, "\n");
1149         return 0;
1150 }
1151 EXPORT_SYMBOL(lprocfs_seq_at_hist_helper);
1152
1153 /* See also ptlrpc_lprocfs_timeouts_show_seq */
1154 int lprocfs_timeouts_seq_show(struct seq_file *m, void *data)
1155 {
1156         struct obd_device *obd = (struct obd_device *)data;
1157         struct obd_import *imp;
1158         unsigned int cur, worst;
1159         time_t now, worstt;
1160         struct dhms ts;
1161         int i;
1162
1163         LASSERT(obd != NULL);
1164         LPROCFS_CLIMP_CHECK(obd);
1165         imp = obd->u.cli.cl_import;
1166
1167         now = cfs_time_current_sec();
1168
1169         /* Some network health info for kicks */
1170         s2dhms(&ts, now - imp->imp_last_reply_time);
1171         seq_printf(m, "%-10s : %ld, "DHMS_FMT" ago\n",
1172                    "last reply", imp->imp_last_reply_time, DHMS_VARS(&ts));
1173
1174         cur = at_get(&imp->imp_at.iat_net_latency);
1175         worst = imp->imp_at.iat_net_latency.at_worst_ever;
1176         worstt = imp->imp_at.iat_net_latency.at_worst_time;
1177         s2dhms(&ts, now - worstt);
1178         seq_printf(m, "%-10s : cur %3u  worst %3u (at %ld, "DHMS_FMT" ago) ",
1179                    "network", cur, worst, worstt, DHMS_VARS(&ts));
1180         lprocfs_seq_at_hist_helper(m, &imp->imp_at.iat_net_latency);
1181
1182         for(i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1183                 if (imp->imp_at.iat_portal[i] == 0)
1184                         break;
1185                 cur = at_get(&imp->imp_at.iat_service_estimate[i]);
1186                 worst = imp->imp_at.iat_service_estimate[i].at_worst_ever;
1187                 worstt = imp->imp_at.iat_service_estimate[i].at_worst_time;
1188                 s2dhms(&ts, now - worstt);
1189                 seq_printf(m, "portal %-2d  : cur %3u  worst %3u (at %ld, "
1190                            DHMS_FMT" ago) ", imp->imp_at.iat_portal[i],
1191                            cur, worst, worstt, DHMS_VARS(&ts));
1192                 lprocfs_seq_at_hist_helper(m, &imp->imp_at.iat_service_estimate[i]);
1193         }
1194
1195         LPROCFS_CLIMP_EXIT(obd);
1196         return 0;
1197 }
1198 EXPORT_SYMBOL(lprocfs_timeouts_seq_show);
1199
1200 int lprocfs_connect_flags_seq_show(struct seq_file *m, void *data)
1201 {
1202         struct obd_device *obd = data;
1203         __u64 flags;
1204
1205         LPROCFS_CLIMP_CHECK(obd);
1206         flags = obd->u.cli.cl_import->imp_connect_data.ocd_connect_flags;
1207         seq_printf(m, "flags="LPX64"\n", flags);
1208         obd_connect_seq_flags2str(m, flags, "\n");
1209         seq_printf(m, "\n");
1210         LPROCFS_CLIMP_EXIT(obd);
1211         return 0;
1212 }
1213 EXPORT_SYMBOL(lprocfs_connect_flags_seq_show);
1214
1215 int
1216 lprocfs_obd_setup(struct obd_device *obd)
1217 {
1218         int rc = 0;
1219
1220         LASSERT(obd != NULL);
1221         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1222         LASSERT(obd->obd_type->typ_procroot != NULL);
1223
1224         obd->obd_proc_entry = lprocfs_seq_register(obd->obd_name,
1225                                                    obd->obd_type->typ_procroot,
1226                                                    obd->obd_vars, obd);
1227         if (IS_ERR(obd->obd_proc_entry)) {
1228                 rc = PTR_ERR(obd->obd_proc_entry);
1229                 CERROR("error %d setting up lprocfs for %s\n",rc,obd->obd_name);
1230                 obd->obd_proc_entry = NULL;
1231         }
1232         return rc;
1233 }
1234 EXPORT_SYMBOL(lprocfs_obd_setup);
1235
1236 int lprocfs_obd_cleanup(struct obd_device *obd)
1237 {
1238         if (!obd)
1239                 return -EINVAL;
1240         if (obd->obd_proc_exports_entry) {
1241                 /* Should be no exports left */
1242                 lprocfs_remove(&obd->obd_proc_exports_entry);
1243                 obd->obd_proc_exports_entry = NULL;
1244         }
1245         if (obd->obd_proc_entry) {
1246                 lprocfs_remove(&obd->obd_proc_entry);
1247                 obd->obd_proc_entry = NULL;
1248         }
1249         return 0;
1250 }
1251 EXPORT_SYMBOL(lprocfs_obd_cleanup);
1252
1253 int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int cpuid)
1254 {
1255         struct lprocfs_counter  *cntr;
1256         unsigned int            percpusize;
1257         int                     rc = -ENOMEM;
1258         unsigned long           flags = 0;
1259         int                     i;
1260
1261         LASSERT(stats->ls_percpu[cpuid] == NULL);
1262         LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);
1263
1264         percpusize = lprocfs_stats_counter_size(stats);
1265         LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[cpuid], percpusize);
1266         if (stats->ls_percpu[cpuid] != NULL) {
1267                 rc = 0;
1268                 if (unlikely(stats->ls_biggest_alloc_num <= cpuid)) {
1269                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1270                                 spin_lock_irqsave(&stats->ls_lock, flags);
1271                         else
1272                                 spin_lock(&stats->ls_lock);
1273                         if (stats->ls_biggest_alloc_num <= cpuid)
1274                                 stats->ls_biggest_alloc_num = cpuid + 1;
1275                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) {
1276                                 spin_unlock_irqrestore(&stats->ls_lock, flags);
1277                         } else {
1278                                 spin_unlock(&stats->ls_lock);
1279                         }
1280                 }
1281                 /* initialize the ls_percpu[cpuid] non-zero counter */
1282                 for (i = 0; i < stats->ls_num; ++i) {
1283                         cntr = lprocfs_stats_counter_get(stats, cpuid, i);
1284                         cntr->lc_min = LC_MIN_INIT;
1285                 }
1286         }
1287         return rc;
1288 }
1289 EXPORT_SYMBOL(lprocfs_stats_alloc_one);
1290
1291 struct lprocfs_stats *lprocfs_alloc_stats(unsigned int num,
1292                                           enum lprocfs_stats_flags flags)
1293 {
1294         struct lprocfs_stats    *stats;
1295         unsigned int            num_entry;
1296         unsigned int            percpusize = 0;
1297         int                     i;
1298
1299         if (num == 0)
1300                 return NULL;
1301
1302         if (lprocfs_no_percpu_stats != 0)
1303                 flags |= LPROCFS_STATS_FLAG_NOPERCPU;
1304
1305         if (flags & LPROCFS_STATS_FLAG_NOPERCPU)
1306                 num_entry = 1;
1307         else
1308                 num_entry = num_possible_cpus();
1309
1310         /* alloc percpu pointers for all possible cpu slots */
1311         LIBCFS_ALLOC(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1312         if (stats == NULL)
1313                 return NULL;
1314
1315         stats->ls_num = num;
1316         stats->ls_flags = flags;
1317         spin_lock_init(&stats->ls_lock);
1318
1319         /* alloc num of counter headers */
1320         LIBCFS_ALLOC(stats->ls_cnt_header,
1321                      stats->ls_num * sizeof(struct lprocfs_counter_header));
1322         if (stats->ls_cnt_header == NULL)
1323                 goto fail;
1324
1325         if ((flags & LPROCFS_STATS_FLAG_NOPERCPU) != 0) {
1326                 /* contains only one set counters */
1327                 percpusize = lprocfs_stats_counter_size(stats);
1328                 LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[0], percpusize);
1329                 if (stats->ls_percpu[0] == NULL)
1330                         goto fail;
1331                 stats->ls_biggest_alloc_num = 1;
1332         } else if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0) {
1333                 /* alloc all percpu data, currently only obd_memory use this */
1334                 for (i = 0; i < num_entry; ++i)
1335                         if (lprocfs_stats_alloc_one(stats, i) < 0)
1336                                 goto fail;
1337         }
1338
1339         return stats;
1340
1341 fail:
1342         lprocfs_free_stats(&stats);
1343         return NULL;
1344 }
1345 EXPORT_SYMBOL(lprocfs_alloc_stats);
1346
1347 void lprocfs_free_stats(struct lprocfs_stats **statsh)
1348 {
1349         struct lprocfs_stats *stats = *statsh;
1350         unsigned int num_entry;
1351         unsigned int percpusize;
1352         unsigned int i;
1353
1354         if (stats == NULL || stats->ls_num == 0)
1355                 return;
1356         *statsh = NULL;
1357
1358         if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU)
1359                 num_entry = 1;
1360         else
1361                 num_entry = num_possible_cpus();
1362
1363         percpusize = lprocfs_stats_counter_size(stats);
1364         for (i = 0; i < num_entry; i++)
1365                 if (stats->ls_percpu[i] != NULL)
1366                         LIBCFS_FREE(stats->ls_percpu[i], percpusize);
1367         if (stats->ls_cnt_header != NULL)
1368                 LIBCFS_FREE(stats->ls_cnt_header, stats->ls_num *
1369                                         sizeof(struct lprocfs_counter_header));
1370         LIBCFS_FREE(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
1371 }
1372 EXPORT_SYMBOL(lprocfs_free_stats);
1373
1374 void lprocfs_clear_stats(struct lprocfs_stats *stats)
1375 {
1376         struct lprocfs_counter          *percpu_cntr;
1377         int                             i;
1378         int                             j;
1379         unsigned int                    num_entry;
1380         unsigned long                   flags = 0;
1381
1382         num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1383
1384         for (i = 0; i < num_entry; i++) {
1385                 if (stats->ls_percpu[i] == NULL)
1386                         continue;
1387                 for (j = 0; j < stats->ls_num; j++) {
1388                         percpu_cntr = lprocfs_stats_counter_get(stats, i, j);
1389                         percpu_cntr->lc_count           = 0;
1390                         percpu_cntr->lc_min             = LC_MIN_INIT;
1391                         percpu_cntr->lc_max             = 0;
1392                         percpu_cntr->lc_sumsquare       = 0;
1393                         percpu_cntr->lc_sum             = 0;
1394                         if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
1395                                 percpu_cntr->lc_sum_irq = 0;
1396                 }
1397         }
1398
1399         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1400 }
1401 EXPORT_SYMBOL(lprocfs_clear_stats);
1402
1403 static ssize_t lprocfs_stats_seq_write(struct file *file,
1404                                        const char __user *buf,
1405                                        size_t len, loff_t *off)
1406 {
1407         struct seq_file *seq = file->private_data;
1408         struct lprocfs_stats *stats = seq->private;
1409
1410         lprocfs_clear_stats(stats);
1411
1412         return len;
1413 }
1414
1415 static void *lprocfs_stats_seq_start(struct seq_file *p, loff_t *pos)
1416 {
1417         struct lprocfs_stats *stats = p->private;
1418
1419         return (*pos < stats->ls_num) ? pos : NULL;
1420 }
1421
1422 static void lprocfs_stats_seq_stop(struct seq_file *p, void *v)
1423 {
1424 }
1425
1426 static void *lprocfs_stats_seq_next(struct seq_file *p, void *v, loff_t *pos)
1427 {
1428         (*pos)++;
1429
1430         return lprocfs_stats_seq_start(p, pos);
1431 }
1432
1433 /* seq file export of one lprocfs counter */
1434 static int lprocfs_stats_seq_show(struct seq_file *p, void *v)
1435 {
1436         struct lprocfs_stats            *stats  = p->private;
1437         struct lprocfs_counter_header   *hdr;
1438         struct lprocfs_counter           ctr;
1439         int                              idx    = *(loff_t *)v;
1440         int                              rc     = 0;
1441
1442         if (idx == 0) {
1443                 struct timeval now;
1444
1445                 do_gettimeofday(&now);
1446                 rc = seq_printf(p, "%-25s %lu.%lu secs.usecs\n",
1447                                 "snapshot_time", now.tv_sec, now.tv_usec);
1448                 if (rc < 0)
1449                         return rc;
1450         }
1451
1452         hdr = &stats->ls_cnt_header[idx];
1453         lprocfs_stats_collect(stats, idx, &ctr);
1454
1455         if (ctr.lc_count == 0)
1456                 goto out;
1457
1458         rc = seq_printf(p, "%-25s "LPD64" samples [%s]", hdr->lc_name,
1459                         ctr.lc_count, hdr->lc_units);
1460         if (rc < 0)
1461                 goto out;
1462
1463         if ((hdr->lc_config & LPROCFS_CNTR_AVGMINMAX) && ctr.lc_count > 0) {
1464                 rc = seq_printf(p, " "LPD64" "LPD64" "LPD64,
1465                                 ctr.lc_min, ctr.lc_max, ctr.lc_sum);
1466                 if (rc < 0)
1467                         goto out;
1468                 if (hdr->lc_config & LPROCFS_CNTR_STDDEV)
1469                         rc = seq_printf(p, " "LPD64, ctr.lc_sumsquare);
1470                 if (rc < 0)
1471                         goto out;
1472         }
1473         rc = seq_printf(p, "\n");
1474 out:
1475         return (rc < 0) ? rc : 0;
1476 }
1477
1478 static const struct seq_operations lprocfs_stats_seq_sops = {
1479         .start  = lprocfs_stats_seq_start,
1480         .stop   = lprocfs_stats_seq_stop,
1481         .next   = lprocfs_stats_seq_next,
1482         .show   = lprocfs_stats_seq_show,
1483 };
1484
1485 static int lprocfs_stats_seq_open(struct inode *inode, struct file *file)
1486 {
1487         struct seq_file *seq;
1488         int rc;
1489
1490         rc = LPROCFS_ENTRY_CHECK(inode);
1491         if (rc < 0)
1492                 return rc;
1493
1494         rc = seq_open(file, &lprocfs_stats_seq_sops);
1495         if (rc)
1496                 return rc;
1497         seq = file->private_data;
1498         seq->private = PDE_DATA(inode);
1499         return 0;
1500 }
1501
1502 static const struct file_operations lprocfs_stats_seq_fops = {
1503         .owner   = THIS_MODULE,
1504         .open    = lprocfs_stats_seq_open,
1505         .read    = seq_read,
1506         .write   = lprocfs_stats_seq_write,
1507         .llseek  = seq_lseek,
1508         .release = lprocfs_seq_release,
1509 };
1510
1511 int lprocfs_register_stats(struct proc_dir_entry *root, const char *name,
1512                            struct lprocfs_stats *stats)
1513 {
1514         struct proc_dir_entry *entry;
1515         LASSERT(root != NULL);
1516
1517         entry = proc_create_data(name, 0644, root,
1518                                  &lprocfs_stats_seq_fops, stats);
1519         if (entry == NULL)
1520                 return -ENOMEM;
1521         return 0;
1522 }
1523 EXPORT_SYMBOL(lprocfs_register_stats);
1524
1525 void lprocfs_counter_init(struct lprocfs_stats *stats, int index,
1526                           unsigned conf, const char *name, const char *units)
1527 {
1528         struct lprocfs_counter_header   *header;
1529         struct lprocfs_counter          *percpu_cntr;
1530         unsigned long                   flags = 0;
1531         unsigned int                    i;
1532         unsigned int                    num_cpu;
1533
1534         LASSERT(stats != NULL);
1535
1536         header = &stats->ls_cnt_header[index];
1537         LASSERTF(header != NULL, "Failed to allocate stats header:[%d]%s/%s\n",
1538                  index, name, units);
1539
1540         header->lc_config = conf;
1541         header->lc_name   = name;
1542         header->lc_units  = units;
1543
1544         num_cpu = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
1545         for (i = 0; i < num_cpu; ++i) {
1546                 if (stats->ls_percpu[i] == NULL)
1547                         continue;
1548                 percpu_cntr = lprocfs_stats_counter_get(stats, i, index);
1549                 percpu_cntr->lc_count           = 0;
1550                 percpu_cntr->lc_min             = LC_MIN_INIT;
1551                 percpu_cntr->lc_max             = 0;
1552                 percpu_cntr->lc_sumsquare       = 0;
1553                 percpu_cntr->lc_sum             = 0;
1554                 if ((stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1555                         percpu_cntr->lc_sum_irq = 0;
1556         }
1557         lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
1558 }
1559 EXPORT_SYMBOL(lprocfs_counter_init);
1560
1561 /* Note that we only init md counters for ops whose offset is less
1562  * than NUM_MD_STATS. This is explained in a comment in the definition
1563  * of struct md_ops. */
1564 #define LPROCFS_MD_OP_INIT(base, stats, op)                                    \
1565         do {                                                                   \
1566                 unsigned int _idx = base + MD_COUNTER_OFFSET(op);              \
1567                                                                                \
1568                 if (MD_COUNTER_OFFSET(op) < NUM_MD_STATS) {                    \
1569                         LASSERT(_idx < stats->ls_num);                         \
1570                         lprocfs_counter_init(stats, _idx, 0, #op, "reqs");     \
1571                 }                                                              \
1572         } while (0)
1573
1574 void lprocfs_init_mps_stats(int num_private_stats, struct lprocfs_stats *stats)
1575 {
1576         LPROCFS_MD_OP_INIT(num_private_stats, stats, getstatus);
1577         LPROCFS_MD_OP_INIT(num_private_stats, stats, null_inode);
1578         LPROCFS_MD_OP_INIT(num_private_stats, stats, find_cbdata);
1579         LPROCFS_MD_OP_INIT(num_private_stats, stats, close);
1580         LPROCFS_MD_OP_INIT(num_private_stats, stats, create);
1581         LPROCFS_MD_OP_INIT(num_private_stats, stats, done_writing);
1582         LPROCFS_MD_OP_INIT(num_private_stats, stats, enqueue);
1583         LPROCFS_MD_OP_INIT(num_private_stats, stats, getattr);
1584         LPROCFS_MD_OP_INIT(num_private_stats, stats, getattr_name);
1585         LPROCFS_MD_OP_INIT(num_private_stats, stats, intent_lock);
1586         LPROCFS_MD_OP_INIT(num_private_stats, stats, link);
1587         LPROCFS_MD_OP_INIT(num_private_stats, stats, rename);
1588         LPROCFS_MD_OP_INIT(num_private_stats, stats, setattr);
1589         LPROCFS_MD_OP_INIT(num_private_stats, stats, fsync);
1590         LPROCFS_MD_OP_INIT(num_private_stats, stats, read_page);
1591         LPROCFS_MD_OP_INIT(num_private_stats, stats, unlink);
1592         LPROCFS_MD_OP_INIT(num_private_stats, stats, setxattr);
1593         LPROCFS_MD_OP_INIT(num_private_stats, stats, getxattr);
1594         LPROCFS_MD_OP_INIT(num_private_stats, stats, init_ea_size);
1595         LPROCFS_MD_OP_INIT(num_private_stats, stats, get_lustre_md);
1596         LPROCFS_MD_OP_INIT(num_private_stats, stats, free_lustre_md);
1597         LPROCFS_MD_OP_INIT(num_private_stats, stats, update_lsm_md);
1598         LPROCFS_MD_OP_INIT(num_private_stats, stats, merge_attr);
1599         LPROCFS_MD_OP_INIT(num_private_stats, stats, set_open_replay_data);
1600         LPROCFS_MD_OP_INIT(num_private_stats, stats, clear_open_replay_data);
1601         LPROCFS_MD_OP_INIT(num_private_stats, stats, set_lock_data);
1602         LPROCFS_MD_OP_INIT(num_private_stats, stats, lock_match);
1603         LPROCFS_MD_OP_INIT(num_private_stats, stats, cancel_unused);
1604         LPROCFS_MD_OP_INIT(num_private_stats, stats, renew_capa);
1605         LPROCFS_MD_OP_INIT(num_private_stats, stats, unpack_capa);
1606         LPROCFS_MD_OP_INIT(num_private_stats, stats, get_remote_perm);
1607         LPROCFS_MD_OP_INIT(num_private_stats, stats, intent_getattr_async);
1608         LPROCFS_MD_OP_INIT(num_private_stats, stats, revalidate_lock);
1609 }
1610 EXPORT_SYMBOL(lprocfs_init_mps_stats);
1611
1612 int lprocfs_alloc_md_stats(struct obd_device *obd,
1613                            unsigned int num_private_stats)
1614 {
1615         struct lprocfs_stats *stats;
1616         unsigned int num_stats;
1617         int rc, i;
1618
1619         CLASSERT(offsetof(struct md_ops, MD_STATS_FIRST_OP) == 0);
1620         CLASSERT(_MD_COUNTER_OFFSET(MD_STATS_FIRST_OP) == 0);
1621         CLASSERT(_MD_COUNTER_OFFSET(MD_STATS_LAST_OP) > 0);
1622
1623         /* TODO Ensure that this function is only used where
1624          * appropriate by adding an assertion to the effect that
1625          * obd->obd_type->typ_md_ops is not NULL. We can't do this now
1626          * because mdt_procfs_init() uses this function to allocate
1627          * the stats backing /proc/fs/lustre/mdt/.../md_stats but the
1628          * mdt layer does not use the md_ops interface. This is
1629          * confusing and a waste of memory. See LU-2484.
1630          */
1631         LASSERT(obd->obd_proc_entry != NULL);
1632         LASSERT(obd->obd_md_stats == NULL);
1633         LASSERT(obd->obd_md_cntr_base == 0);
1634
1635         num_stats = NUM_MD_STATS + num_private_stats;
1636         stats = lprocfs_alloc_stats(num_stats, 0);
1637         if (stats == NULL)
1638                 return -ENOMEM;
1639
1640         lprocfs_init_mps_stats(num_private_stats, stats);
1641
1642         for (i = num_private_stats; i < num_stats; i++) {
1643                 if (stats->ls_cnt_header[i].lc_name == NULL) {
1644                         CERROR("Missing md_stat initializer md_op "
1645                                "operation at offset %d. Aborting.\n",
1646                                i - num_private_stats);
1647                         LBUG();
1648                 }
1649         }
1650
1651         rc = lprocfs_register_stats(obd->obd_proc_entry, "md_stats", stats);
1652         if (rc < 0) {
1653                 lprocfs_free_stats(&stats);
1654         } else {
1655                 obd->obd_md_stats = stats;
1656                 obd->obd_md_cntr_base = num_private_stats;
1657         }
1658
1659         return rc;
1660 }
1661 EXPORT_SYMBOL(lprocfs_alloc_md_stats);
1662
1663 void lprocfs_free_md_stats(struct obd_device *obd)
1664 {
1665         struct lprocfs_stats *stats = obd->obd_md_stats;
1666
1667         if (stats != NULL) {
1668                 obd->obd_md_stats = NULL;
1669                 obd->obd_md_cntr_base = 0;
1670                 lprocfs_free_stats(&stats);
1671         }
1672 }
1673 EXPORT_SYMBOL(lprocfs_free_md_stats);
1674
1675 void lprocfs_init_ldlm_stats(struct lprocfs_stats *ldlm_stats)
1676 {
1677         lprocfs_counter_init(ldlm_stats,
1678                              LDLM_ENQUEUE - LDLM_FIRST_OPC,
1679                              0, "ldlm_enqueue", "reqs");
1680         lprocfs_counter_init(ldlm_stats,
1681                              LDLM_CONVERT - LDLM_FIRST_OPC,
1682                              0, "ldlm_convert", "reqs");
1683         lprocfs_counter_init(ldlm_stats,
1684                              LDLM_CANCEL - LDLM_FIRST_OPC,
1685                              0, "ldlm_cancel", "reqs");
1686         lprocfs_counter_init(ldlm_stats,
1687                              LDLM_BL_CALLBACK - LDLM_FIRST_OPC,
1688                              0, "ldlm_bl_callback", "reqs");
1689         lprocfs_counter_init(ldlm_stats,
1690                              LDLM_CP_CALLBACK - LDLM_FIRST_OPC,
1691                              0, "ldlm_cp_callback", "reqs");
1692         lprocfs_counter_init(ldlm_stats,
1693                              LDLM_GL_CALLBACK - LDLM_FIRST_OPC,
1694                              0, "ldlm_gl_callback", "reqs");
1695 }
1696 EXPORT_SYMBOL(lprocfs_init_ldlm_stats);
1697
1698 __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
1699                           struct lprocfs_counter_header *header,
1700                           enum lprocfs_stats_flags flags,
1701                           enum lprocfs_fields_flags field)
1702 {
1703         __s64 ret = 0;
1704
1705         if (lc == NULL || header == NULL)
1706                 RETURN(0);
1707
1708         switch (field) {
1709                 case LPROCFS_FIELDS_FLAGS_CONFIG:
1710                         ret = header->lc_config;
1711                         break;
1712                 case LPROCFS_FIELDS_FLAGS_SUM:
1713                         ret = lc->lc_sum;
1714                         if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
1715                                 ret += lc->lc_sum_irq;
1716                         break;
1717                 case LPROCFS_FIELDS_FLAGS_MIN:
1718                         ret = lc->lc_min;
1719                         break;
1720                 case LPROCFS_FIELDS_FLAGS_MAX:
1721                         ret = lc->lc_max;
1722                         break;
1723                 case LPROCFS_FIELDS_FLAGS_AVG:
1724                         ret = (lc->lc_max - lc->lc_min) / 2;
1725                         break;
1726                 case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
1727                         ret = lc->lc_sumsquare;
1728                         break;
1729                 case LPROCFS_FIELDS_FLAGS_COUNT:
1730                         ret = lc->lc_count;
1731                         break;
1732                 default:
1733                         break;
1734         };
1735         RETURN(ret);
1736 }
1737 EXPORT_SYMBOL(lprocfs_read_helper);
1738
1739 int lprocfs_write_helper(const char __user *buffer, unsigned long count,
1740                          int *val)
1741 {
1742         return lprocfs_write_frac_helper(buffer, count, val, 1);
1743 }
1744 EXPORT_SYMBOL(lprocfs_write_helper);
1745
1746 int lprocfs_write_frac_helper(const char __user *buffer, unsigned long count,
1747                               int *val, int mult)
1748 {
1749         char kernbuf[20], *end, *pbuf;
1750
1751         if (count > (sizeof(kernbuf) - 1))
1752                 return -EINVAL;
1753
1754         if (copy_from_user(kernbuf, buffer, count))
1755                 return -EFAULT;
1756
1757         kernbuf[count] = '\0';
1758         pbuf = kernbuf;
1759         if (*pbuf == '-') {
1760                 mult = -mult;
1761                 pbuf++;
1762         }
1763
1764         *val = (int)simple_strtoul(pbuf, &end, 10) * mult;
1765         if (pbuf == end)
1766                 return -EINVAL;
1767
1768         if (end != NULL && *end == '.') {
1769                 int temp_val, pow = 1;
1770                 int i;
1771
1772                 pbuf = end + 1;
1773                 if (strlen(pbuf) > 5)
1774                         pbuf[5] = '\0'; /*only allow 5bits fractional*/
1775
1776                 temp_val = (int)simple_strtoul(pbuf, &end, 10) * mult;
1777
1778                 if (pbuf < end) {
1779                         for (i = 0; i < (end - pbuf); i++)
1780                                 pow *= 10;
1781
1782                         *val += temp_val / pow;
1783                 }
1784         }
1785         return 0;
1786 }
1787 EXPORT_SYMBOL(lprocfs_write_frac_helper);
1788
1789 int lprocfs_read_frac_helper(char *buffer, unsigned long count, long val,
1790                              int mult)
1791 {
1792         long decimal_val, frac_val;
1793         int prtn;
1794
1795         if (count < 10)
1796                 return -EINVAL;
1797
1798         decimal_val = val / mult;
1799         prtn = snprintf(buffer, count, "%ld", decimal_val);
1800         frac_val = val % mult;
1801
1802         if (prtn < (count - 4) && frac_val > 0) {
1803                 long temp_frac;
1804                 int i, temp_mult = 1, frac_bits = 0;
1805
1806                 temp_frac = frac_val * 10;
1807                 buffer[prtn++] = '.';
1808                 while (frac_bits < 2 && (temp_frac / mult) < 1 ) {
1809                         /* only reserved 2 bits fraction */
1810                         buffer[prtn++] ='0';
1811                         temp_frac *= 10;
1812                         frac_bits++;
1813                 }
1814                 /*
1815                  * Need to think these cases :
1816                  *      1. #echo x.00 > /proc/xxx       output result : x
1817                  *      2. #echo x.0x > /proc/xxx       output result : x.0x
1818                  *      3. #echo x.x0 > /proc/xxx       output result : x.x
1819                  *      4. #echo x.xx > /proc/xxx       output result : x.xx
1820                  *      Only reserved 2 bits fraction.
1821                  */
1822                 for (i = 0; i < (5 - prtn); i++)
1823                         temp_mult *= 10;
1824
1825                 frac_bits = min((int)count - prtn, 3 - frac_bits);
1826                 prtn += snprintf(buffer + prtn, frac_bits, "%ld",
1827                                  frac_val * temp_mult / mult);
1828
1829                 prtn--;
1830                 while(buffer[prtn] < '1' || buffer[prtn] > '9') {
1831                         prtn--;
1832                         if (buffer[prtn] == '.') {
1833                                 prtn--;
1834                                 break;
1835                         }
1836                 }
1837                 prtn++;
1838         }
1839         buffer[prtn++] ='\n';
1840         return prtn;
1841 }
1842 EXPORT_SYMBOL(lprocfs_read_frac_helper);
1843
1844 int lprocfs_seq_read_frac_helper(struct seq_file *m, long val, int mult)
1845 {
1846         long decimal_val, frac_val;
1847
1848         decimal_val = val / mult;
1849         seq_printf(m, "%ld", decimal_val);
1850         frac_val = val % mult;
1851
1852         if (frac_val > 0) {
1853                 frac_val *= 100;
1854                 frac_val /= mult;
1855         }
1856         if (frac_val > 0) {
1857                 /* Three cases: x0, xx, 0x */
1858                 if ((frac_val % 10) != 0)
1859                         seq_printf(m, ".%ld", frac_val);
1860                 else
1861                         seq_printf(m, ".%ld", frac_val / 10);
1862         }
1863
1864         seq_printf(m, "\n");
1865         return 0;
1866 }
1867 EXPORT_SYMBOL(lprocfs_seq_read_frac_helper);
1868
1869 int lprocfs_write_u64_helper(const char __user *buffer, unsigned long count,
1870                              __u64 *val)
1871 {
1872         return lprocfs_write_frac_u64_helper(buffer, count, val, 1);
1873 }
1874 EXPORT_SYMBOL(lprocfs_write_u64_helper);
1875
1876 int lprocfs_write_frac_u64_helper(const char __user *buffer,
1877                                   unsigned long count,
1878                                   __u64 *val, int mult)
1879 {
1880         char kernbuf[22], *end, *pbuf;
1881         __u64 whole, frac = 0, units;
1882         unsigned frac_d = 1;
1883
1884         if (count > (sizeof(kernbuf) - 1))
1885                 return -EINVAL;
1886
1887         if (copy_from_user(kernbuf, buffer, count))
1888                 return -EFAULT;
1889
1890         kernbuf[count] = '\0';
1891         pbuf = kernbuf;
1892         if (*pbuf == '-') {
1893                 mult = -mult;
1894                 pbuf++;
1895         }
1896
1897         whole = simple_strtoull(pbuf, &end, 10);
1898         if (pbuf == end)
1899                 return -EINVAL;
1900
1901         if (end != NULL && *end == '.') {
1902                 int i;
1903                 pbuf = end + 1;
1904
1905                 /* need to limit frac_d to a __u32 */
1906                 if (strlen(pbuf) > 10)
1907                         pbuf[10] = '\0';
1908
1909                 frac = simple_strtoull(pbuf, &end, 10);
1910                 /* count decimal places */
1911                 for (i = 0; i < (end - pbuf); i++)
1912                         frac_d *= 10;
1913         }
1914
1915         units = 1;
1916         if (end != NULL) {
1917                 switch (*end) {
1918                 case 'p': case 'P':
1919                         units <<= 10;
1920                 case 't': case 'T':
1921                         units <<= 10;
1922                 case 'g': case 'G':
1923                         units <<= 10;
1924                 case 'm': case 'M':
1925                         units <<= 10;
1926                 case 'k': case 'K':
1927                         units <<= 10;
1928                 }
1929         }
1930         /* Specified units override the multiplier */
1931         if (units > 1)
1932                 mult = mult < 0 ? -units : units;
1933
1934         frac *= mult;
1935         do_div(frac, frac_d);
1936         *val = whole * mult + frac;
1937         return 0;
1938 }
1939 EXPORT_SYMBOL(lprocfs_write_frac_u64_helper);
1940
1941 static char *lprocfs_strnstr(const char *s1, const char *s2, size_t len)
1942 {
1943         size_t l2;
1944
1945         l2 = strlen(s2);
1946         if (!l2)
1947                 return (char *)s1;
1948         while (len >= l2) {
1949                 len--;
1950                 if (!memcmp(s1, s2, l2))
1951                         return (char *)s1;
1952                 s1++;
1953         }
1954         return NULL;
1955 }
1956
1957 /**
1958  * Find the string \a name in the input \a buffer, and return a pointer to the
1959  * value immediately following \a name, reducing \a count appropriately.
1960  * If \a name is not found the original \a buffer is returned.
1961  */
1962 char *lprocfs_find_named_value(const char *buffer, const char *name,
1963                                 size_t *count)
1964 {
1965         char *val;
1966         size_t buflen = *count;
1967
1968         /* there is no strnstr() in rhel5 and ubuntu kernels */
1969         val = lprocfs_strnstr(buffer, name, buflen);
1970         if (val == NULL)
1971                 return (char *)buffer;
1972
1973         val += strlen(name);                             /* skip prefix */
1974         while (val < buffer + buflen && isspace(*val)) /* skip separator */
1975                 val++;
1976
1977         *count = 0;
1978         while (val < buffer + buflen && isalnum(*val)) {
1979                 ++*count;
1980                 ++val;
1981         }
1982
1983         return val - *count;
1984 }
1985 EXPORT_SYMBOL(lprocfs_find_named_value);
1986
1987 int lprocfs_seq_create(struct proc_dir_entry *parent,
1988                        const char *name,
1989                        mode_t mode,
1990                        const struct file_operations *seq_fops,
1991                        void *data)
1992 {
1993         struct proc_dir_entry *entry;
1994         ENTRY;
1995
1996         /* Disallow secretly (un)writable entries. */
1997         LASSERT((seq_fops->write == NULL) == ((mode & 0222) == 0));
1998
1999         entry = proc_create_data(name, mode, parent, seq_fops, data);
2000
2001         if (entry == NULL)
2002                 RETURN(-ENOMEM);
2003
2004         RETURN(0);
2005 }
2006 EXPORT_SYMBOL(lprocfs_seq_create);
2007
2008 int lprocfs_obd_seq_create(struct obd_device *dev,
2009                            const char *name,
2010                            mode_t mode,
2011                            const struct file_operations *seq_fops,
2012                            void *data)
2013 {
2014         return (lprocfs_seq_create(dev->obd_proc_entry, name,
2015                                    mode, seq_fops, data));
2016 }
2017 EXPORT_SYMBOL(lprocfs_obd_seq_create);
2018
2019 void lprocfs_oh_tally(struct obd_histogram *oh, unsigned int value)
2020 {
2021         if (value >= OBD_HIST_MAX)
2022                 value = OBD_HIST_MAX - 1;
2023
2024         spin_lock(&oh->oh_lock);
2025         oh->oh_buckets[value]++;
2026         spin_unlock(&oh->oh_lock);
2027 }
2028 EXPORT_SYMBOL(lprocfs_oh_tally);
2029
2030 void lprocfs_oh_tally_log2(struct obd_histogram *oh, unsigned int value)
2031 {
2032         unsigned int val = 0;
2033
2034         if (likely(value != 0))
2035                 val = min(fls(value - 1), OBD_HIST_MAX);
2036
2037         lprocfs_oh_tally(oh, val);
2038 }
2039 EXPORT_SYMBOL(lprocfs_oh_tally_log2);
2040
2041 unsigned long lprocfs_oh_sum(struct obd_histogram *oh)
2042 {
2043         unsigned long ret = 0;
2044         int i;
2045
2046         for (i = 0; i < OBD_HIST_MAX; i++)
2047                 ret +=  oh->oh_buckets[i];
2048         return ret;
2049 }
2050 EXPORT_SYMBOL(lprocfs_oh_sum);
2051
2052 void lprocfs_oh_clear(struct obd_histogram *oh)
2053 {
2054         spin_lock(&oh->oh_lock);
2055         memset(oh->oh_buckets, 0, sizeof(oh->oh_buckets));
2056         spin_unlock(&oh->oh_lock);
2057 }
2058 EXPORT_SYMBOL(lprocfs_oh_clear);
2059
2060 int lprocfs_obd_rd_max_pages_per_rpc(char *page, char **start, off_t off,
2061                                      int count, int *eof, void *data)
2062 {
2063         struct obd_device *dev = data;
2064         struct client_obd *cli = &dev->u.cli;
2065         int rc;
2066
2067         spin_lock(&cli->cl_loi_list_lock);
2068         rc = snprintf(page, count, "%d\n", cli->cl_max_pages_per_rpc);
2069         spin_unlock(&cli->cl_loi_list_lock);
2070
2071         return rc;
2072 }
2073 EXPORT_SYMBOL(lprocfs_obd_rd_max_pages_per_rpc);
2074
2075 int lprocfs_obd_max_pages_per_rpc_seq_show(struct seq_file *m, void *data)
2076 {
2077         struct obd_device *dev = data;
2078         struct client_obd *cli = &dev->u.cli;
2079         int rc;
2080
2081         spin_lock(&cli->cl_loi_list_lock);
2082         rc = seq_printf(m, "%d\n", cli->cl_max_pages_per_rpc);
2083         spin_unlock(&cli->cl_loi_list_lock);
2084         return rc;
2085 }
2086 EXPORT_SYMBOL(lprocfs_obd_max_pages_per_rpc_seq_show);
2087
2088 int lprocfs_wr_root_squash(const char __user *buffer, unsigned long count,
2089                            struct root_squash_info *squash, char *name)
2090 {
2091         int rc;
2092         char kernbuf[64], *tmp, *errmsg;
2093         unsigned long uid, gid;
2094         ENTRY;
2095
2096         if (count >= sizeof(kernbuf)) {
2097                 errmsg = "string too long";
2098                 GOTO(failed_noprint, rc = -EINVAL);
2099         }
2100         if (copy_from_user(kernbuf, buffer, count)) {
2101                 errmsg = "bad address";
2102                 GOTO(failed_noprint, rc = -EFAULT);
2103         }
2104         kernbuf[count] = '\0';
2105
2106         /* look for uid gid separator */
2107         tmp = strchr(kernbuf, ':');
2108         if (tmp == NULL) {
2109                 errmsg = "needs uid:gid format";
2110                 GOTO(failed, rc = -EINVAL);
2111         }
2112         *tmp = '\0';
2113         tmp++;
2114
2115         /* parse uid */
2116         if (kstrtoul(kernbuf, 0, &uid) != 0) {
2117                 errmsg = "bad uid";
2118                 GOTO(failed, rc = -EINVAL);
2119         }
2120
2121         /* parse gid */
2122         if (kstrtoul(tmp, 0, &gid) != 0) {
2123                 errmsg = "bad gid";
2124                 GOTO(failed, rc = -EINVAL);
2125         }
2126
2127         squash->rsi_uid = uid;
2128         squash->rsi_gid = gid;
2129
2130         LCONSOLE_INFO("%s: root_squash is set to %u:%u\n",
2131                       name, squash->rsi_uid, squash->rsi_gid);
2132         RETURN(count);
2133
2134 failed:
2135         if (tmp != NULL) {
2136                 tmp--;
2137                 *tmp = ':';
2138         }
2139         CWARN("%s: failed to set root_squash to \"%s\", %s, rc = %d\n",
2140               name, kernbuf, errmsg, rc);
2141         RETURN(rc);
2142 failed_noprint:
2143         CWARN("%s: failed to set root_squash due to %s, rc = %d\n",
2144               name, errmsg, rc);
2145         RETURN(rc);
2146 }
2147 EXPORT_SYMBOL(lprocfs_wr_root_squash);
2148
2149
2150 int lprocfs_wr_nosquash_nids(const char __user *buffer, unsigned long count,
2151                              struct root_squash_info *squash, char *name)
2152 {
2153         int rc;
2154         char *kernbuf = NULL;
2155         char *errmsg;
2156         struct list_head tmp;
2157         ENTRY;
2158
2159         if (count > 4096) {
2160                 errmsg = "string too long";
2161                 GOTO(failed, rc = -EINVAL);
2162         }
2163
2164         OBD_ALLOC(kernbuf, count + 1);
2165         if (kernbuf == NULL) {
2166                 errmsg = "no memory";
2167                 GOTO(failed, rc = -ENOMEM);
2168         }
2169         if (copy_from_user(kernbuf, buffer, count)) {
2170                 errmsg = "bad address";
2171                 GOTO(failed, rc = -EFAULT);
2172         }
2173         kernbuf[count] = '\0';
2174
2175         if (count > 0 && kernbuf[count - 1] == '\n')
2176                 kernbuf[count - 1] = '\0';
2177
2178         if (strcmp(kernbuf, "NONE") == 0 || strcmp(kernbuf, "clear") == 0) {
2179                 /* empty string is special case */
2180                 down_write(&squash->rsi_sem);
2181                 if (!list_empty(&squash->rsi_nosquash_nids))
2182                         cfs_free_nidlist(&squash->rsi_nosquash_nids);
2183                 up_write(&squash->rsi_sem);
2184                 LCONSOLE_INFO("%s: nosquash_nids is cleared\n", name);
2185                 OBD_FREE(kernbuf, count + 1);
2186                 RETURN(count);
2187         }
2188
2189         INIT_LIST_HEAD(&tmp);
2190         if (cfs_parse_nidlist(kernbuf, count, &tmp) <= 0) {
2191                 errmsg = "can't parse";
2192                 GOTO(failed, rc = -EINVAL);
2193         }
2194         LCONSOLE_INFO("%s: nosquash_nids set to %s\n",
2195                       name, kernbuf);
2196         OBD_FREE(kernbuf, count + 1);
2197         kernbuf = NULL;
2198
2199         down_write(&squash->rsi_sem);
2200         if (!list_empty(&squash->rsi_nosquash_nids))
2201                 cfs_free_nidlist(&squash->rsi_nosquash_nids);
2202         list_splice(&tmp, &squash->rsi_nosquash_nids);
2203         up_write(&squash->rsi_sem);
2204
2205         RETURN(count);
2206
2207 failed:
2208         if (kernbuf) {
2209                 CWARN("%s: failed to set nosquash_nids to \"%s\", %s rc = %d\n",
2210                       name, kernbuf, errmsg, rc);
2211                 OBD_FREE(kernbuf, count + 1);
2212         } else {
2213                 CWARN("%s: failed to set nosquash_nids due to %s rc = %d\n",
2214                       name, errmsg, rc);
2215         }
2216         RETURN(rc);
2217 }
2218 EXPORT_SYMBOL(lprocfs_wr_nosquash_nids);
2219
2220 #endif /* CONFIG_PROC_FS*/