lustre/llite/lproc_llite.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36 #define DEBUG_SUBSYSTEM S_LLITE
  37
  38 #include <linux/version.h>
  39 #include <lustre_lite.h>
  40 #include <lprocfs_status.h>
  41 #include <linux/seq_file.h>
  42 #include <obd_support.h>
  43
  44 #include "llite_internal.h"
  45
  46 struct proc_dir_entry *proc_lustre_fs_root;
  47
  48 #ifdef LPROCFS
  49 /* /proc/lustre/llite mount point registration */
  50 extern struct file_operations vvp_dump_pgcache_file_ops;
  51 struct file_operations ll_rw_extents_stats_fops;
  52 struct file_operations ll_rw_extents_stats_pp_fops;
  53 struct file_operations ll_rw_offset_stats_fops;
  54
  55 static int ll_rd_blksize(char *page, char **start, off_t off, int count,
  56                          int *eof, void *data)
  57 {
  58         struct super_block *sb = (struct super_block *)data;
  59         struct obd_statfs osfs;
  60         int rc;
  61
  62         LASSERT(sb != NULL);
  63         rc = ll_statfs_internal(sb, &osfs, cfs_time_current_64() - HZ,
  64                                 OBD_STATFS_NODELAY);
  65         if (!rc) {
  66               *eof = 1;
  67               rc = snprintf(page, count, "%u\n", osfs.os_bsize);
  68         }
  69
  70         return rc;
  71 }
  72
  73 static int ll_rd_kbytestotal(char *page, char **start, off_t off, int count,
  74                              int *eof, void *data)
  75 {
  76         struct super_block *sb = (struct super_block *)data;
  77         struct obd_statfs osfs;
  78         int rc;
  79
  80         LASSERT(sb != NULL);
  81         rc = ll_statfs_internal(sb, &osfs, cfs_time_current_64() - HZ,
  82                                 OBD_STATFS_NODELAY);
  83         if (!rc) {
  84                 __u32 blk_size = osfs.os_bsize >> 10;
  85                 __u64 result = osfs.os_blocks;
  86
  87                 while (blk_size >>= 1)
  88                         result <<= 1;
  89
  90                 *eof = 1;
  91                 rc = snprintf(page, count, LPU64"\n", result);
  92         }
  93         return rc;
  94
  95 }
  96
  97 static int ll_rd_kbytesfree(char *page, char **start, off_t off, int count,
  98                             int *eof, void *data)
  99 {
 100         struct super_block *sb = (struct super_block *)data;
 101         struct obd_statfs osfs;
 102         int rc;
 103
 104         LASSERT(sb != NULL);
 105         rc = ll_statfs_internal(sb, &osfs, cfs_time_current_64() - HZ,
 106                                 OBD_STATFS_NODELAY);
 107         if (!rc) {
 108                 __u32 blk_size = osfs.os_bsize >> 10;
 109                 __u64 result = osfs.os_bfree;
 110
 111                 while (blk_size >>= 1)
 112                         result <<= 1;
 113
 114                 *eof = 1;
 115                 rc = snprintf(page, count, LPU64"\n", result);
 116         }
 117         return rc;
 118 }
 119
 120 static int ll_rd_kbytesavail(char *page, char **start, off_t off, int count,
 121                              int *eof, void *data)
 122 {
 123         struct super_block *sb = (struct super_block *)data;
 124         struct obd_statfs osfs;
 125         int rc;
 126
 127         LASSERT(sb != NULL);
 128         rc = ll_statfs_internal(sb, &osfs, cfs_time_current_64() - HZ,
 129                                 OBD_STATFS_NODELAY);
 130         if (!rc) {
 131                 __u32 blk_size = osfs.os_bsize >> 10;
 132                 __u64 result = osfs.os_bavail;
 133
 134                 while (blk_size >>= 1)
 135                         result <<= 1;
 136
 137                 *eof = 1;
 138                 rc = snprintf(page, count, LPU64"\n", result);
 139         }
 140         return rc;
 141 }
 142
 143 static int ll_rd_filestotal(char *page, char **start, off_t off, int count,
 144                             int *eof, void *data)
 145 {
 146         struct super_block *sb = (struct super_block *)data;
 147         struct obd_statfs osfs;
 148         int rc;
 149
 150         LASSERT(sb != NULL);
 151         rc = ll_statfs_internal(sb, &osfs, cfs_time_current_64() - HZ,
 152                                 OBD_STATFS_NODELAY);
 153         if (!rc) {
 154                  *eof = 1;
 155                  rc = snprintf(page, count, LPU64"\n", osfs.os_files);
 156         }
 157         return rc;
 158 }
 159
 160 static int ll_rd_filesfree(char *page, char **start, off_t off, int count,
 161                            int *eof, void *data)
 162 {
 163         struct super_block *sb = (struct super_block *)data;
 164         struct obd_statfs osfs;
 165         int rc;
 166
 167         LASSERT(sb != NULL);
 168         rc = ll_statfs_internal(sb, &osfs, cfs_time_current_64() - HZ,
 169                                 OBD_STATFS_NODELAY);
 170         if (!rc) {
 171                  *eof = 1;
 172                  rc = snprintf(page, count, LPU64"\n", osfs.os_ffree);
 173         }
 174         return rc;
 175
 176 }
 177
 178 static int ll_rd_client_type(char *page, char **start, off_t off, int count,
 179                             int *eof, void *data)
 180 {
 181         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)data);
 182         int rc;
 183
 184         LASSERT(sbi != NULL);
 185
 186         *eof = 1;
 187         if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
 188                 rc = snprintf(page, count, "remote client\n");
 189         else
 190                 rc = snprintf(page, count, "local client\n");
 191
 192         return rc;
 193 }
 194
 195 static int ll_rd_fstype(char *page, char **start, off_t off, int count,
 196                         int *eof, void *data)
 197 {
 198         struct super_block *sb = (struct super_block*)data;
 199
 200         LASSERT(sb != NULL);
 201         *eof = 1;
 202         return snprintf(page, count, "%s\n", sb->s_type->name);
 203 }
 204
 205 static int ll_rd_sb_uuid(char *page, char **start, off_t off, int count,
 206                          int *eof, void *data)
 207 {
 208         struct super_block *sb = (struct super_block *)data;
 209
 210         LASSERT(sb != NULL);
 211         *eof = 1;
 212         return snprintf(page, count, "%s\n", ll_s2sbi(sb)->ll_sb_uuid.uuid);
 213 }
 214
 215 static int ll_rd_site_stats(char *page, char **start, off_t off,
 216                             int count, int *eof, void *data)
 217 {
 218         struct super_block *sb = data;
 219
 220         /*
 221          * See description of statistical counters in struct cl_site, and
 222          * struct lu_site.
 223          */
 224         return cl_site_stats_print(lu2cl_site(ll_s2sbi(sb)->ll_site),
 225                                    page, count);
 226 }
 227
 228 static int ll_rd_max_readahead_mb(char *page, char **start, off_t off,
 229                                    int count, int *eof, void *data)
 230 {
 231         struct super_block *sb = data;
 232         struct ll_sb_info *sbi = ll_s2sbi(sb);
 233         long pages_number;
 234         int mult;
 235
 236         spin_lock(&sbi->ll_lock);
 237         pages_number = sbi->ll_ra_info.ra_max_pages;
 238         spin_unlock(&sbi->ll_lock);
 239
 240         mult = 1 << (20 - PAGE_CACHE_SHIFT);
 241         return lprocfs_read_frac_helper(page, count, pages_number, mult);
 242 }
 243
 244 static int ll_wr_max_readahead_mb(struct file *file, const char *buffer,
 245                                    unsigned long count, void *data)
 246 {
 247         struct super_block *sb = data;
 248         struct ll_sb_info *sbi = ll_s2sbi(sb);
 249         int mult, rc, pages_number;
 250
 251         mult = 1 << (20 - CFS_PAGE_SHIFT);
 252         rc = lprocfs_write_frac_helper(buffer, count, &pages_number, mult);
 253         if (rc)
 254                 return rc;
 255
 256         if (pages_number < 0 || pages_number > num_physpages / 2) {
 257                 CERROR("can't set file readahead more than %lu MB\n",
 258                         num_physpages >> (20 - CFS_PAGE_SHIFT + 1)); /*1/2 of RAM*/
 259                 return -ERANGE;
 260         }
 261
 262         spin_lock(&sbi->ll_lock);
 263         sbi->ll_ra_info.ra_max_pages = pages_number;
 264         spin_unlock(&sbi->ll_lock);
 265
 266         return count;
 267 }
 268
 269 static int ll_rd_max_readahead_per_file_mb(char *page, char **start, off_t off,
 270                                           int count, int *eof, void *data)
 271 {
 272         struct super_block *sb = data;
 273         struct ll_sb_info *sbi = ll_s2sbi(sb);
 274         long pages_number;
 275         int mult;
 276
 277         spin_lock(&sbi->ll_lock);
 278         pages_number = sbi->ll_ra_info.ra_max_pages_per_file;
 279         spin_unlock(&sbi->ll_lock);
 280
 281         mult = 1 << (20 - CFS_PAGE_SHIFT);
 282         return lprocfs_read_frac_helper(page, count, pages_number, mult);
 283 }
 284
 285 static int ll_wr_max_readahead_per_file_mb(struct file *file, const char *buffer,
 286                                           unsigned long count, void *data)
 287 {
 288         struct super_block *sb = data;
 289         struct ll_sb_info *sbi = ll_s2sbi(sb);
 290         int mult, rc, pages_number;
 291
 292         mult = 1 << (20 - CFS_PAGE_SHIFT);
 293         rc = lprocfs_write_frac_helper(buffer, count, &pages_number, mult);
 294         if (rc)
 295                 return rc;
 296
 297         if (pages_number < 0 ||
 298                 pages_number > sbi->ll_ra_info.ra_max_pages) {
 299                 CERROR("can't set file readahead more than"
 300                        "max_read_ahead_mb %lu MB\n", sbi->ll_ra_info.ra_max_pages);
 301                 return -ERANGE;
 302         }
 303
 304         spin_lock(&sbi->ll_lock);
 305         sbi->ll_ra_info.ra_max_pages_per_file = pages_number;
 306         spin_unlock(&sbi->ll_lock);
 307
 308         return count;
 309 }
 310
 311 static int ll_rd_max_read_ahead_whole_mb(char *page, char **start, off_t off,
 312                                        int count, int *eof, void *data)
 313 {
 314         struct super_block *sb = data;
 315         struct ll_sb_info *sbi = ll_s2sbi(sb);
 316         long pages_number;
 317         int mult;
 318
 319         spin_lock(&sbi->ll_lock);
 320         pages_number = sbi->ll_ra_info.ra_max_read_ahead_whole_pages;
 321         spin_unlock(&sbi->ll_lock);
 322
 323         mult = 1 << (20 - CFS_PAGE_SHIFT);
 324         return lprocfs_read_frac_helper(page, count, pages_number, mult);
 325 }
 326
 327 static int ll_wr_max_read_ahead_whole_mb(struct file *file, const char *buffer,
 328                                        unsigned long count, void *data)
 329 {
 330         struct super_block *sb = data;
 331         struct ll_sb_info *sbi = ll_s2sbi(sb);
 332         int mult, rc, pages_number;
 333
 334         mult = 1 << (20 - CFS_PAGE_SHIFT);
 335         rc = lprocfs_write_frac_helper(buffer, count, &pages_number, mult);
 336         if (rc)
 337                 return rc;
 338
 339         /* Cap this at the current max readahead window size, the readahead
 340          * algorithm does this anyway so it's pointless to set it larger. */
 341         if (pages_number < 0 ||
 342             pages_number > sbi->ll_ra_info.ra_max_pages_per_file) {
 343                 CERROR("can't set max_read_ahead_whole_mb more than "
 344                        "max_read_ahead_per_file_mb: %lu\n",
 345                         sbi->ll_ra_info.ra_max_pages_per_file >> (20 - CFS_PAGE_SHIFT));
 346                 return -ERANGE;
 347         }
 348
 349         spin_lock(&sbi->ll_lock);
 350         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = pages_number;
 351         spin_unlock(&sbi->ll_lock);
 352
 353         return count;
 354 }
 355
 356 static int ll_rd_max_cached_mb(char *page, char **start, off_t off,
 357                                int count, int *eof, void *data)
 358 {
 359         struct super_block *sb = data;
 360         struct ll_sb_info *sbi = ll_s2sbi(sb);
 361         long pages_number;
 362         int mult;
 363
 364         spin_lock(&sbi->ll_lock);
 365         pages_number = sbi->ll_async_page_max;
 366         spin_unlock(&sbi->ll_lock);
 367
 368         mult = 1 << (20 - CFS_PAGE_SHIFT);
 369         return lprocfs_read_frac_helper(page, count, pages_number, mult);;
 370 }
 371
 372 static int ll_wr_max_cached_mb(struct file *file, const char *buffer,
 373                                   unsigned long count, void *data)
 374 {
 375         struct super_block *sb = data;
 376         struct ll_sb_info *sbi = ll_s2sbi(sb);
 377         int mult, rc, pages_number;
 378
 379         mult = 1 << (20 - CFS_PAGE_SHIFT);
 380         rc = lprocfs_write_frac_helper(buffer, count, &pages_number, mult);
 381         if (rc)
 382                 return rc;
 383
 384         if (pages_number < 0 || pages_number > num_physpages) {
 385                 CERROR("can't set max cache more than %lu MB\n",
 386                         num_physpages >> (20 - CFS_PAGE_SHIFT));
 387                 return -ERANGE;
 388         }
 389
 390         spin_lock(&sbi->ll_lock);
 391         sbi->ll_async_page_max = pages_number ;
 392         spin_unlock(&sbi->ll_lock);
 393
 394         if (!sbi->ll_dt_exp)
 395                 /* Not set up yet, don't call llap_shrink_cache */
 396                 return count;
 397
 398         return count;
 399 }
 400
 401 static int ll_rd_checksum(char *page, char **start, off_t off,
 402                           int count, int *eof, void *data)
 403 {
 404         struct super_block *sb = data;
 405         struct ll_sb_info *sbi = ll_s2sbi(sb);
 406
 407         return snprintf(page, count, "%u\n",
 408                         (sbi->ll_flags & LL_SBI_CHECKSUM) ? 1 : 0);
 409 }
 410
 411 static int ll_wr_checksum(struct file *file, const char *buffer,
 412                           unsigned long count, void *data)
 413 {
 414         struct super_block *sb = data;
 415         struct ll_sb_info *sbi = ll_s2sbi(sb);
 416         int val, rc;
 417
 418         if (!sbi->ll_dt_exp)
 419                 /* Not set up yet */
 420                 return -EAGAIN;
 421
 422         rc = lprocfs_write_helper(buffer, count, &val);
 423         if (rc)
 424                 return rc;
 425         if (val)
 426                 sbi->ll_flags |= LL_SBI_CHECKSUM;
 427         else
 428                 sbi->ll_flags &= ~LL_SBI_CHECKSUM;
 429
 430         rc = obd_set_info_async(sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 431                                 KEY_CHECKSUM, sizeof(val), &val, NULL);
 432         if (rc)
 433                 CWARN("Failed to set OSC checksum flags: %d\n", rc);
 434
 435         return count;
 436 }
 437
 438 static int ll_rd_max_rw_chunk(char *page, char **start, off_t off,
 439                           int count, int *eof, void *data)
 440 {
 441         struct super_block *sb = data;
 442
 443         return snprintf(page, count, "%lu\n", ll_s2sbi(sb)->ll_max_rw_chunk);
 444 }
 445
 446 static int ll_wr_max_rw_chunk(struct file *file, const char *buffer,
 447                           unsigned long count, void *data)
 448 {
 449         struct super_block *sb = data;
 450         int rc, val;
 451
 452         rc = lprocfs_write_helper(buffer, count, &val);
 453         if (rc)
 454                 return rc;
 455         ll_s2sbi(sb)->ll_max_rw_chunk = val;
 456         return count;
 457 }
 458
 459 static int ll_rd_track_id(char *page, int count, void *data,
 460                           enum stats_track_type type)
 461 {
 462         struct super_block *sb = data;
 463
 464         if (ll_s2sbi(sb)->ll_stats_track_type == type) {
 465                 return snprintf(page, count, "%d\n",
 466                                 ll_s2sbi(sb)->ll_stats_track_id);
 467
 468         } else if (ll_s2sbi(sb)->ll_stats_track_type == STATS_TRACK_ALL) {
 469                 return snprintf(page, count, "0 (all)\n");
 470         } else {
 471                 return snprintf(page, count, "untracked\n");
 472         }
 473 }
 474
 475 static int ll_wr_track_id(const char *buffer, unsigned long count, void *data,
 476                           enum stats_track_type type)
 477 {
 478         struct super_block *sb = data;
 479         int rc, pid;
 480
 481         rc = lprocfs_write_helper(buffer, count, &pid);
 482         if (rc)
 483                 return rc;
 484         ll_s2sbi(sb)->ll_stats_track_id = pid;
 485         if (pid == 0)
 486                 ll_s2sbi(sb)->ll_stats_track_type = STATS_TRACK_ALL;
 487         else
 488                 ll_s2sbi(sb)->ll_stats_track_type = type;
 489         lprocfs_clear_stats(ll_s2sbi(sb)->ll_stats);
 490         return count;
 491 }
 492
 493 static int ll_rd_track_pid(char *page, char **start, off_t off,
 494                           int count, int *eof, void *data)
 495 {
 496         return (ll_rd_track_id(page, count, data, STATS_TRACK_PID));
 497 }
 498
 499 static int ll_wr_track_pid(struct file *file, const char *buffer,
 500                           unsigned long count, void *data)
 501 {
 502         return (ll_wr_track_id(buffer, count, data, STATS_TRACK_PID));
 503 }
 504
 505 static int ll_rd_track_ppid(char *page, char **start, off_t off,
 506                           int count, int *eof, void *data)
 507 {
 508         return (ll_rd_track_id(page, count, data, STATS_TRACK_PPID));
 509 }
 510
 511 static int ll_wr_track_ppid(struct file *file, const char *buffer,
 512                           unsigned long count, void *data)
 513 {
 514         return (ll_wr_track_id(buffer, count, data, STATS_TRACK_PPID));
 515 }
 516
 517 static int ll_rd_track_gid(char *page, char **start, off_t off,
 518                           int count, int *eof, void *data)
 519 {
 520         return (ll_rd_track_id(page, count, data, STATS_TRACK_GID));
 521 }
 522
 523 static int ll_wr_track_gid(struct file *file, const char *buffer,
 524                           unsigned long count, void *data)
 525 {
 526         return (ll_wr_track_id(buffer, count, data, STATS_TRACK_GID));
 527 }
 528
 529 static int ll_rd_statahead_max(char *page, char **start, off_t off,
 530                                int count, int *eof, void *data)
 531 {
 532         struct super_block *sb = data;
 533         struct ll_sb_info *sbi = ll_s2sbi(sb);
 534
 535         return snprintf(page, count, "%u\n", sbi->ll_sa_max);
 536 }
 537
 538 static int ll_wr_statahead_max(struct file *file, const char *buffer,
 539                                unsigned long count, void *data)
 540 {
 541         struct super_block *sb = data;
 542         struct ll_sb_info *sbi = ll_s2sbi(sb);
 543         int val, rc;
 544
 545         rc = lprocfs_write_helper(buffer, count, &val);
 546         if (rc)
 547                 return rc;
 548
 549         if (val >= 0 && val <= LL_SA_RPC_MAX)
 550                 sbi->ll_sa_max = val;
 551         else
 552                 CERROR("Bad statahead_max value %d. Valid values are in the "
 553                        "range [0, %d]\n", val, LL_SA_RPC_MAX);
 554
 555         return count;
 556 }
 557
 558 static int ll_rd_statahead_stats(char *page, char **start, off_t off,
 559                                  int count, int *eof, void *data)
 560 {
 561         struct super_block *sb = data;
 562         struct ll_sb_info *sbi = ll_s2sbi(sb);
 563
 564         return snprintf(page, count,
 565                         "statahead total: %u\n"
 566                         "statahead wrong: %u\n",
 567                         atomic_read(&sbi->ll_sa_total),
 568                         atomic_read(&sbi->ll_sa_wrong));
 569 }
 570
 571 static int ll_rd_lazystatfs(char *page, char **start, off_t off,
 572                             int count, int *eof, void *data)
 573 {
 574         struct super_block *sb = data;
 575         struct ll_sb_info *sbi = ll_s2sbi(sb);
 576
 577         return snprintf(page, count, "%u\n",
 578                         (sbi->ll_flags & LL_SBI_LAZYSTATFS) ? 1 : 0);
 579 }
 580
 581 static int ll_wr_lazystatfs(struct file *file, const char *buffer,
 582                             unsigned long count, void *data)
 583 {
 584         struct super_block *sb = data;
 585         struct ll_sb_info *sbi = ll_s2sbi(sb);
 586         int val, rc;
 587
 588         rc = lprocfs_write_helper(buffer, count, &val);
 589         if (rc)
 590                 return rc;
 591
 592         if (val)
 593                 sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 594         else
 595                 sbi->ll_flags &= ~LL_SBI_LAZYSTATFS;
 596
 597         return count;
 598 }
 599
 600 static struct lprocfs_vars lprocfs_llite_obd_vars[] = {
 601         { "uuid",         ll_rd_sb_uuid,          0, 0 },
 602         //{ "mntpt_path",   ll_rd_path,             0, 0 },
 603         { "fstype",       ll_rd_fstype,           0, 0 },
 604         { "site",         ll_rd_site_stats,       0, 0 },
 605         { "blocksize",    ll_rd_blksize,          0, 0 },
 606         { "kbytestotal",  ll_rd_kbytestotal,      0, 0 },
 607         { "kbytesfree",   ll_rd_kbytesfree,       0, 0 },
 608         { "kbytesavail",  ll_rd_kbytesavail,      0, 0 },
 609         { "filestotal",   ll_rd_filestotal,       0, 0 },
 610         { "filesfree",    ll_rd_filesfree,        0, 0 },
 611         { "client_type",  ll_rd_client_type,      0, 0 },
 612         //{ "filegroups",   lprocfs_rd_filegroups,  0, 0 },
 613         { "max_read_ahead_mb", ll_rd_max_readahead_mb,
 614                                ll_wr_max_readahead_mb, 0 },
 615         { "max_read_ahead_per_file_mb", ll_rd_max_readahead_per_file_mb,
 616                                         ll_wr_max_readahead_per_file_mb, 0 },
 617         { "max_read_ahead_whole_mb", ll_rd_max_read_ahead_whole_mb,
 618                                      ll_wr_max_read_ahead_whole_mb, 0 },
 619         { "max_cached_mb",    ll_rd_max_cached_mb, ll_wr_max_cached_mb, 0 },
 620         { "checksum_pages",   ll_rd_checksum, ll_wr_checksum, 0 },
 621         { "max_rw_chunk",     ll_rd_max_rw_chunk, ll_wr_max_rw_chunk, 0 },
 622         { "stats_track_pid",  ll_rd_track_pid, ll_wr_track_pid, 0 },
 623         { "stats_track_ppid", ll_rd_track_ppid, ll_wr_track_ppid, 0 },
 624         { "stats_track_gid",  ll_rd_track_gid, ll_wr_track_gid, 0 },
 625         { "statahead_max",    ll_rd_statahead_max, ll_wr_statahead_max, 0 },
 626         { "statahead_stats",  ll_rd_statahead_stats, 0, 0 },
 627         { "lazystatfs",         ll_rd_lazystatfs, ll_wr_lazystatfs, 0 },
 628         { 0 }
 629 };
 630
 631 #define MAX_STRING_SIZE 128
 632
 633 struct llite_file_opcode {
 634         __u32       opcode;
 635         __u32       type;
 636         const char *opname;
 637 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
 638         /* file operation */
 639         { LPROC_LL_DIRTY_HITS,     LPROCFS_TYPE_REGS, "dirty_pages_hits" },
 640         { LPROC_LL_DIRTY_MISSES,   LPROCFS_TYPE_REGS, "dirty_pages_misses" },
 641         { LPROC_LL_WB_WRITEPAGE,   LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
 642                                    "writeback_from_writepage" },
 643         { LPROC_LL_WB_PRESSURE,    LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
 644                                    "writeback_from_pressure" },
 645         { LPROC_LL_WB_OK,          LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
 646                                    "writeback_ok_pages" },
 647         { LPROC_LL_WB_FAIL,        LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
 648                                    "writeback_failed_pages" },
 649         { LPROC_LL_READ_BYTES,     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
 650                                    "read_bytes" },
 651         { LPROC_LL_WRITE_BYTES,    LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
 652                                    "write_bytes" },
 653         { LPROC_LL_BRW_READ,       LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
 654                                    "brw_read" },
 655         { LPROC_LL_BRW_WRITE,      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
 656                                    "brw_write" },
 657
 658         { LPROC_LL_IOCTL,          LPROCFS_TYPE_REGS, "ioctl" },
 659         { LPROC_LL_OPEN,           LPROCFS_TYPE_REGS, "open" },
 660         { LPROC_LL_RELEASE,        LPROCFS_TYPE_REGS, "close" },
 661         { LPROC_LL_MAP,            LPROCFS_TYPE_REGS, "mmap" },
 662         { LPROC_LL_LLSEEK,         LPROCFS_TYPE_REGS, "seek" },
 663         { LPROC_LL_FSYNC,          LPROCFS_TYPE_REGS, "fsync" },
 664         /* inode operation */
 665         { LPROC_LL_SETATTR,        LPROCFS_TYPE_REGS, "setattr" },
 666         { LPROC_LL_TRUNC,          LPROCFS_TYPE_REGS, "truncate" },
 667         { LPROC_LL_LOCKLESS_TRUNC, LPROCFS_TYPE_REGS, "lockless_truncate"},
 668         { LPROC_LL_FLOCK,          LPROCFS_TYPE_REGS, "flock" },
 669         { LPROC_LL_GETATTR,        LPROCFS_TYPE_REGS, "getattr" },
 670         /* special inode operation */
 671         { LPROC_LL_STAFS,          LPROCFS_TYPE_REGS, "statfs" },
 672         { LPROC_LL_ALLOC_INODE,    LPROCFS_TYPE_REGS, "alloc_inode" },
 673         { LPROC_LL_SETXATTR,       LPROCFS_TYPE_REGS, "setxattr" },
 674         { LPROC_LL_GETXATTR,       LPROCFS_TYPE_REGS, "getxattr" },
 675         { LPROC_LL_LISTXATTR,      LPROCFS_TYPE_REGS, "listxattr" },
 676         { LPROC_LL_REMOVEXATTR,    LPROCFS_TYPE_REGS, "removexattr" },
 677         { LPROC_LL_INODE_PERM,     LPROCFS_TYPE_REGS, "inode_permission" },
 678         { LPROC_LL_DIRECT_READ,    LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
 679                                    "direct_read" },
 680         { LPROC_LL_DIRECT_WRITE,   LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
 681                                    "direct_write" },
 682         { LPROC_LL_LOCKLESS_READ,  LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
 683                                    "lockless_read_bytes" },
 684         { LPROC_LL_LOCKLESS_WRITE, LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
 685                                    "lockless_write_bytes" },
 686
 687 };
 688
 689 void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
 690 {
 691         if (!sbi->ll_stats)
 692                 return;
 693         if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
 694                 lprocfs_counter_add(sbi->ll_stats, op, count);
 695         else if (sbi->ll_stats_track_type == STATS_TRACK_PID &&
 696                  sbi->ll_stats_track_id == current->pid)
 697                 lprocfs_counter_add(sbi->ll_stats, op, count);
 698         else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
 699                  sbi->ll_stats_track_id == current->parent->pid)
 700                 lprocfs_counter_add(sbi->ll_stats, op, count);
 701         else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
 702                  sbi->ll_stats_track_id == cfs_curproc_gid())
 703                 lprocfs_counter_add(sbi->ll_stats, op, count);
 704 }
 705 EXPORT_SYMBOL(ll_stats_ops_tally);
 706
 707 static const char *ra_stat_string[] = {
 708         [RA_STAT_HIT] = "hits",
 709         [RA_STAT_MISS] = "misses",
 710         [RA_STAT_DISTANT_READPAGE] = "readpage not consecutive",
 711         [RA_STAT_MISS_IN_WINDOW] = "miss inside window",
 712         [RA_STAT_FAILED_GRAB_PAGE] = "failed grab_cache_page",
 713         [RA_STAT_FAILED_MATCH] = "failed lock match",
 714         [RA_STAT_DISCARDED] = "read but discarded",
 715         [RA_STAT_ZERO_LEN] = "zero length file",
 716         [RA_STAT_ZERO_WINDOW] = "zero size window",
 717         [RA_STAT_EOF] = "read-ahead to EOF",
 718         [RA_STAT_MAX_IN_FLIGHT] = "hit max r-a issue",
 719         [RA_STAT_WRONG_GRAB_PAGE] = "wrong page from grab_cache_page",
 720 };
 721
 722
 723 int lprocfs_register_mountpoint(struct proc_dir_entry *parent,
 724                                 struct super_block *sb, char *osc, char *mdc)
 725 {
 726         struct lprocfs_vars lvars[2];
 727         struct lustre_sb_info *lsi = s2lsi(sb);
 728         struct ll_sb_info *sbi = ll_s2sbi(sb);
 729         struct obd_device *obd;
 730         char name[MAX_STRING_SIZE + 1], *ptr;
 731         int err, id, len, rc;
 732         ENTRY;
 733
 734         memset(lvars, 0, sizeof(lvars));
 735
 736         name[MAX_STRING_SIZE] = '\0';
 737         lvars[0].name = name;
 738
 739         LASSERT(sbi != NULL);
 740         LASSERT(mdc != NULL);
 741         LASSERT(osc != NULL);
 742
 743         /* Get fsname */
 744         len = strlen(lsi->lsi_lmd->lmd_profile);
 745         ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
 746         if (ptr && (strcmp(ptr, "-client") == 0))
 747                 len -= 7;
 748
 749         /* Mount info */
 750         snprintf(name, MAX_STRING_SIZE, "%.*s-%p", len,
 751                  lsi->lsi_lmd->lmd_profile, sb);
 752
 753         sbi->ll_proc_root = lprocfs_register(name, parent, NULL, NULL);
 754         if (IS_ERR(sbi->ll_proc_root)) {
 755                 err = PTR_ERR(sbi->ll_proc_root);
 756                 sbi->ll_proc_root = NULL;
 757                 RETURN(err);
 758         }
 759
 760         rc = lprocfs_seq_create(sbi->ll_proc_root, "dump_page_cache", 0444,
 761                                 &vvp_dump_pgcache_file_ops, sbi);
 762         if (rc)
 763                 CWARN("Error adding the dump_page_cache file\n");
 764
 765         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats", 0644,
 766                                 &ll_rw_extents_stats_fops, sbi);
 767         if (rc)
 768                 CWARN("Error adding the extent_stats file\n");
 769
 770         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats_per_process",
 771                                 0644, &ll_rw_extents_stats_pp_fops, sbi);
 772         if (rc)
 773                 CWARN("Error adding the extents_stats_per_process file\n");
 774
 775         rc = lprocfs_seq_create(sbi->ll_proc_root, "offset_stats", 0644,
 776                                 &ll_rw_offset_stats_fops, sbi);
 777         if (rc)
 778                 CWARN("Error adding the offset_stats file\n");
 779
 780         /* File operations stats */
 781         sbi->ll_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES,
 782                                             LPROCFS_STATS_FLAG_NONE);
 783         if (sbi->ll_stats == NULL)
 784                 GOTO(out, err = -ENOMEM);
 785         /* do counter init */
 786         for (id = 0; id < LPROC_LL_FILE_OPCODES; id++) {
 787                 __u32 type = llite_opcode_table[id].type;
 788                 void *ptr = NULL;
 789                 if (type & LPROCFS_TYPE_REGS)
 790                         ptr = "regs";
 791                 else if (type & LPROCFS_TYPE_BYTES)
 792                         ptr = "bytes";
 793                 else if (type & LPROCFS_TYPE_PAGES)
 794                         ptr = "pages";
 795                 lprocfs_counter_init(sbi->ll_stats,
 796                                      llite_opcode_table[id].opcode,
 797                                      (type & LPROCFS_CNTR_AVGMINMAX),
 798                                      llite_opcode_table[id].opname, ptr);
 799         }
 800         err = lprocfs_register_stats(sbi->ll_proc_root, "stats", sbi->ll_stats);
 801         if (err)
 802                 GOTO(out, err);
 803
 804         sbi->ll_ra_stats = lprocfs_alloc_stats(ARRAY_SIZE(ra_stat_string),
 805                                                LPROCFS_STATS_FLAG_NONE);
 806         if (sbi->ll_ra_stats == NULL)
 807                 GOTO(out, err = -ENOMEM);
 808
 809         for (id = 0; id < ARRAY_SIZE(ra_stat_string); id++)
 810                 lprocfs_counter_init(sbi->ll_ra_stats, id, 0,
 811                                      ra_stat_string[id], "pages");
 812         err = lprocfs_register_stats(sbi->ll_proc_root, "read_ahead_stats",
 813                                      sbi->ll_ra_stats);
 814         if (err)
 815                 GOTO(out, err);
 816
 817
 818         err = lprocfs_add_vars(sbi->ll_proc_root, lprocfs_llite_obd_vars, sb);
 819         if (err)
 820                 GOTO(out, err);
 821
 822         /* MDC info */
 823         obd = class_name2obd(mdc);
 824
 825         LASSERT(obd != NULL);
 826         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 827         LASSERT(obd->obd_type->typ_name != NULL);
 828
 829         snprintf(name, MAX_STRING_SIZE, "%s/common_name",
 830                  obd->obd_type->typ_name);
 831         lvars[0].read_fptr = lprocfs_rd_name;
 832         err = lprocfs_add_vars(sbi->ll_proc_root, lvars, obd);
 833         if (err)
 834                 GOTO(out, err);
 835
 836         snprintf(name, MAX_STRING_SIZE, "%s/uuid", obd->obd_type->typ_name);
 837         lvars[0].read_fptr = lprocfs_rd_uuid;
 838         err = lprocfs_add_vars(sbi->ll_proc_root, lvars, obd);
 839         if (err)
 840                 GOTO(out, err);
 841
 842         /* OSC */
 843         obd = class_name2obd(osc);
 844
 845         LASSERT(obd != NULL);
 846         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 847         LASSERT(obd->obd_type->typ_name != NULL);
 848
 849         snprintf(name, MAX_STRING_SIZE, "%s/common_name",
 850                  obd->obd_type->typ_name);
 851         lvars[0].read_fptr = lprocfs_rd_name;
 852         err = lprocfs_add_vars(sbi->ll_proc_root, lvars, obd);
 853         if (err)
 854                 GOTO(out, err);
 855
 856         snprintf(name, MAX_STRING_SIZE, "%s/uuid", obd->obd_type->typ_name);
 857         lvars[0].read_fptr = lprocfs_rd_uuid;
 858         err = lprocfs_add_vars(sbi->ll_proc_root, lvars, obd);
 859 out:
 860         if (err) {
 861                 lprocfs_remove(&sbi->ll_proc_root);
 862                 lprocfs_free_stats(&sbi->ll_ra_stats);
 863                 lprocfs_free_stats(&sbi->ll_stats);
 864         }
 865         RETURN(err);
 866 }
 867
 868 void lprocfs_unregister_mountpoint(struct ll_sb_info *sbi)
 869 {
 870         if (sbi->ll_proc_root) {
 871                 lprocfs_remove(&sbi->ll_proc_root);
 872                 lprocfs_free_stats(&sbi->ll_ra_stats);
 873                 lprocfs_free_stats(&sbi->ll_stats);
 874         }
 875 }
 876 #undef MAX_STRING_SIZE
 877
 878 #define pct(a,b) (b ? a * 100 / b : 0)
 879
 880 static void ll_display_extents_info(struct ll_rw_extents_info *io_extents,
 881                                    struct seq_file *seq, int which)
 882 {
 883         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
 884         unsigned long start, end, r, w;
 885         char *unitp = "KMGTPEZY";
 886         int i, units = 10;
 887         struct per_process_info *pp_info = &io_extents->pp_extents[which];
 888
 889         read_cum = 0;
 890         write_cum = 0;
 891         start = 0;
 892
 893         for(i = 0; i < LL_HIST_MAX; i++) {
 894                 read_tot += pp_info->pp_r_hist.oh_buckets[i];
 895                 write_tot += pp_info->pp_w_hist.oh_buckets[i];
 896         }
 897
 898         for(i = 0; i < LL_HIST_MAX; i++) {
 899                 r = pp_info->pp_r_hist.oh_buckets[i];
 900                 w = pp_info->pp_w_hist.oh_buckets[i];
 901                 read_cum += r;
 902                 write_cum += w;
 903                 end = 1 << (i + LL_HIST_START - units);
 904                 seq_printf(seq, "%4lu%c - %4lu%c%c: %14lu %4lu %4lu  | "
 905                            "%14lu %4lu %4lu\n", start, *unitp, end, *unitp,
 906                            (i == LL_HIST_MAX - 1) ? '+' : ' ',
 907                            r, pct(r, read_tot), pct(read_cum, read_tot),
 908                            w, pct(w, write_tot), pct(write_cum, write_tot));
 909                 start = end;
 910                 if (start == 1<<10) {
 911                         start = 1;
 912                         units += 10;
 913                         unitp++;
 914                 }
 915                 if (read_cum == read_tot && write_cum == write_tot)
 916                         break;
 917         }
 918 }
 919
 920 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
 921 {
 922         struct timeval now;
 923         struct ll_sb_info *sbi = seq->private;
 924         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
 925         int k;
 926
 927         do_gettimeofday(&now);
 928
 929         if (!sbi->ll_rw_stats_on) {
 930                 seq_printf(seq, "disabled\n"
 931                                 "write anything in this file to activate, "
 932                                 "then 0 or \"[D/d]isabled\" to deactivate\n");
 933                 return 0;
 934         }
 935         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
 936                    now.tv_sec, now.tv_usec);
 937         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
 938         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
 939                    "extents", "calls", "%", "cum%",
 940                    "calls", "%", "cum%");
 941         spin_lock(&sbi->ll_pp_extent_lock);
 942         for(k = 0; k < LL_PROCESS_HIST_MAX; k++) {
 943                 if(io_extents->pp_extents[k].pid != 0) {
 944                         seq_printf(seq, "\nPID: %d\n",
 945                                    io_extents->pp_extents[k].pid);
 946                         ll_display_extents_info(io_extents, seq, k);
 947                 }
 948         }
 949         spin_unlock(&sbi->ll_pp_extent_lock);
 950         return 0;
 951 }
 952
 953 static ssize_t ll_rw_extents_stats_pp_seq_write(struct file *file,
 954                                                 const char *buf, size_t len,
 955                                                 loff_t *off)
 956 {
 957         struct seq_file *seq = file->private_data;
 958         struct ll_sb_info *sbi = seq->private;
 959         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
 960         int i;
 961         int value = 1, rc = 0;
 962
 963         rc = lprocfs_write_helper(buf, len, &value);
 964         if (rc < 0 && (strcmp(buf, "disabled") == 0 ||
 965                        strcmp(buf, "Disabled") == 0))
 966                 value = 0;
 967
 968         if (value == 0)
 969                 sbi->ll_rw_stats_on = 0;
 970         else
 971                 sbi->ll_rw_stats_on = 1;
 972
 973         spin_lock(&sbi->ll_pp_extent_lock);
 974         for(i = 0; i < LL_PROCESS_HIST_MAX; i++) {
 975                 io_extents->pp_extents[i].pid = 0;
 976                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
 977                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
 978         }
 979         spin_unlock(&sbi->ll_pp_extent_lock);
 980         return len;
 981 }
 982
 983 LPROC_SEQ_FOPS(ll_rw_extents_stats_pp);
 984
 985 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
 986 {
 987         struct timeval now;
 988         struct ll_sb_info *sbi = seq->private;
 989         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
 990
 991         do_gettimeofday(&now);
 992
 993         if (!sbi->ll_rw_stats_on) {
 994                 seq_printf(seq, "disabled\n"
 995                                 "write anything in this file to activate, "
 996                                 "then 0 or \"[D/d]isabled\" to deactivate\n");
 997                 return 0;
 998         }
 999         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
1000                    now.tv_sec, now.tv_usec);
1001
1002         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1003         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1004                    "extents", "calls", "%", "cum%",
1005                    "calls", "%", "cum%");
1006         spin_lock(&sbi->ll_lock);
1007         ll_display_extents_info(io_extents, seq, LL_PROCESS_HIST_MAX);
1008         spin_unlock(&sbi->ll_lock);
1009
1010         return 0;
1011 }
1012
1013 static ssize_t ll_rw_extents_stats_seq_write(struct file *file, const char *buf,
1014                                         size_t len, loff_t *off)
1015 {
1016         struct seq_file *seq = file->private_data;
1017         struct ll_sb_info *sbi = seq->private;
1018         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1019         int i;
1020         int value = 1, rc = 0;
1021
1022         rc = lprocfs_write_helper(buf, len, &value);
1023         if (rc < 0 && (strcmp(buf, "disabled") == 0 ||
1024                        strcmp(buf, "Disabled") == 0))
1025                 value = 0;
1026
1027         if (value == 0)
1028                 sbi->ll_rw_stats_on = 0;
1029         else
1030                 sbi->ll_rw_stats_on = 1;
1031         spin_lock(&sbi->ll_pp_extent_lock);
1032         for(i = 0; i <= LL_PROCESS_HIST_MAX; i++)
1033         {
1034                 io_extents->pp_extents[i].pid = 0;
1035                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1036                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1037         }
1038         spin_unlock(&sbi->ll_pp_extent_lock);
1039
1040         return len;
1041 }
1042
1043 LPROC_SEQ_FOPS(ll_rw_extents_stats);
1044
1045 void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
1046                        struct ll_file_data *file, loff_t pos,
1047                        size_t count, int rw)
1048 {
1049         int i, cur = -1;
1050         struct ll_rw_process_info *process;
1051         struct ll_rw_process_info *offset;
1052         int *off_count = &sbi->ll_rw_offset_entry_count;
1053         int *process_count = &sbi->ll_offset_process_count;
1054         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1055
1056         if(!sbi->ll_rw_stats_on)
1057                 return;
1058         process = sbi->ll_rw_process_info;
1059         offset = sbi->ll_rw_offset_info;
1060
1061         spin_lock(&sbi->ll_pp_extent_lock);
1062         /* Extent statistics */
1063         for(i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1064                 if(io_extents->pp_extents[i].pid == pid) {
1065                         cur = i;
1066                         break;
1067                 }
1068         }
1069
1070         if (cur == -1) {
1071                 /* new process */
1072                 sbi->ll_extent_process_count =
1073                         (sbi->ll_extent_process_count + 1) % LL_PROCESS_HIST_MAX;
1074                 cur = sbi->ll_extent_process_count;
1075                 io_extents->pp_extents[cur].pid = pid;
1076                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_r_hist);
1077                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_w_hist);
1078         }
1079
1080         for(i = 0; (count >= (1 << LL_HIST_START << i)) &&
1081              (i < (LL_HIST_MAX - 1)); i++);
1082         if (rw == 0) {
1083                 io_extents->pp_extents[cur].pp_r_hist.oh_buckets[i]++;
1084                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_r_hist.oh_buckets[i]++;
1085         } else {
1086                 io_extents->pp_extents[cur].pp_w_hist.oh_buckets[i]++;
1087                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_w_hist.oh_buckets[i]++;
1088         }
1089         spin_unlock(&sbi->ll_pp_extent_lock);
1090
1091         spin_lock(&sbi->ll_process_lock);
1092         /* Offset statistics */
1093         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1094                 if (process[i].rw_pid == pid) {
1095                         if (process[i].rw_last_file != file) {
1096                                 process[i].rw_range_start = pos;
1097                                 process[i].rw_last_file_pos = pos + count;
1098                                 process[i].rw_smallest_extent = count;
1099                                 process[i].rw_largest_extent = count;
1100                                 process[i].rw_offset = 0;
1101                                 process[i].rw_last_file = file;
1102                                 spin_unlock(&sbi->ll_process_lock);
1103                                 return;
1104                         }
1105                         if (process[i].rw_last_file_pos != pos) {
1106                                 *off_count =
1107                                     (*off_count + 1) % LL_OFFSET_HIST_MAX;
1108                                 offset[*off_count].rw_op = process[i].rw_op;
1109                                 offset[*off_count].rw_pid = pid;
1110                                 offset[*off_count].rw_range_start =
1111                                         process[i].rw_range_start;
1112                                 offset[*off_count].rw_range_end =
1113                                         process[i].rw_last_file_pos;
1114                                 offset[*off_count].rw_smallest_extent =
1115                                         process[i].rw_smallest_extent;
1116                                 offset[*off_count].rw_largest_extent =
1117                                         process[i].rw_largest_extent;
1118                                 offset[*off_count].rw_offset =
1119                                         process[i].rw_offset;
1120                                 process[i].rw_op = rw;
1121                                 process[i].rw_range_start = pos;
1122                                 process[i].rw_smallest_extent = count;
1123                                 process[i].rw_largest_extent = count;
1124                                 process[i].rw_offset = pos -
1125                                         process[i].rw_last_file_pos;
1126                         }
1127                         if(process[i].rw_smallest_extent > count)
1128                                 process[i].rw_smallest_extent = count;
1129                         if(process[i].rw_largest_extent < count)
1130                                 process[i].rw_largest_extent = count;
1131                         process[i].rw_last_file_pos = pos + count;
1132                         spin_unlock(&sbi->ll_process_lock);
1133                         return;
1134                 }
1135         }
1136         *process_count = (*process_count + 1) % LL_PROCESS_HIST_MAX;
1137         process[*process_count].rw_pid = pid;
1138         process[*process_count].rw_op = rw;
1139         process[*process_count].rw_range_start = pos;
1140         process[*process_count].rw_last_file_pos = pos + count;
1141         process[*process_count].rw_smallest_extent = count;
1142         process[*process_count].rw_largest_extent = count;
1143         process[*process_count].rw_offset = 0;
1144         process[*process_count].rw_last_file = file;
1145         spin_unlock(&sbi->ll_process_lock);
1146 }
1147
1148 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
1149 {
1150         struct timeval now;
1151         struct ll_sb_info *sbi = seq->private;
1152         struct ll_rw_process_info *offset = sbi->ll_rw_offset_info;
1153         struct ll_rw_process_info *process = sbi->ll_rw_process_info;
1154         int i;
1155
1156         do_gettimeofday(&now);
1157
1158         if (!sbi->ll_rw_stats_on) {
1159                 seq_printf(seq, "disabled\n"
1160                                 "write anything in this file to activate, "
1161                                 "then 0 or \"[D/d]isabled\" to deactivate\n");
1162                 return 0;
1163         }
1164         spin_lock(&sbi->ll_process_lock);
1165
1166         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
1167                    now.tv_sec, now.tv_usec);
1168         seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
1169                    "R/W", "PID", "RANGE START", "RANGE END",
1170                    "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");
1171         /* We stored the discontiguous offsets here; print them first */
1172         for(i = 0; i < LL_OFFSET_HIST_MAX; i++) {
1173                 if (offset[i].rw_pid != 0)
1174                         seq_printf(seq,"%3c %10d %14Lu %14Lu %17lu %17lu %14Lu",
1175                                    offset[i].rw_op ? 'W' : 'R',
1176                                    offset[i].rw_pid,
1177                                    offset[i].rw_range_start,
1178                                    offset[i].rw_range_end,
1179                                    (unsigned long)offset[i].rw_smallest_extent,
1180                                    (unsigned long)offset[i].rw_largest_extent,
1181                                    offset[i].rw_offset);
1182         }
1183         /* Then print the current offsets for each process */
1184         for(i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1185                 if (process[i].rw_pid != 0)
1186                         seq_printf(seq,"%3c %10d %14Lu %14Lu %17lu %17lu %14Lu",
1187                                    process[i].rw_op ? 'W' : 'R',
1188                                    process[i].rw_pid,
1189                                    process[i].rw_range_start,
1190                                    process[i].rw_last_file_pos,
1191                                    (unsigned long)process[i].rw_smallest_extent,
1192                                    (unsigned long)process[i].rw_largest_extent,
1193                                    process[i].rw_offset);
1194         }
1195         spin_unlock(&sbi->ll_process_lock);
1196
1197         return 0;
1198 }
1199
1200 static ssize_t ll_rw_offset_stats_seq_write(struct file *file, const char *buf,
1201                                        size_t len, loff_t *off)
1202 {
1203         struct seq_file *seq = file->private_data;
1204         struct ll_sb_info *sbi = seq->private;
1205         struct ll_rw_process_info *process_info = sbi->ll_rw_process_info;
1206         struct ll_rw_process_info *offset_info = sbi->ll_rw_offset_info;
1207         int value = 1, rc = 0;
1208
1209         rc = lprocfs_write_helper(buf, len, &value);
1210
1211         if (rc < 0 && (strcmp(buf, "disabled") == 0 ||
1212                            strcmp(buf, "Disabled") == 0))
1213                 value = 0;
1214
1215         if (value == 0)
1216                 sbi->ll_rw_stats_on = 0;
1217         else
1218                 sbi->ll_rw_stats_on = 1;
1219
1220         spin_lock(&sbi->ll_process_lock);
1221         sbi->ll_offset_process_count = 0;
1222         sbi->ll_rw_offset_entry_count = 0;
1223         memset(process_info, 0, sizeof(struct ll_rw_process_info) *
1224                LL_PROCESS_HIST_MAX);
1225         memset(offset_info, 0, sizeof(struct ll_rw_process_info) *
1226                LL_OFFSET_HIST_MAX);
1227         spin_unlock(&sbi->ll_process_lock);
1228
1229         return len;
1230 }
1231
1232 LPROC_SEQ_FOPS(ll_rw_offset_stats);
1233
1234 void lprocfs_llite_init_vars(struct lprocfs_static_vars *lvars)
1235 {
1236     lvars->module_vars  = NULL;
1237     lvars->obd_vars     = lprocfs_llite_obd_vars;
1238 }
1239 #endif /* LPROCFS */