lustre/osc/lproc_osc.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2002, 2003 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of the Lustre file system, http://www.lustre.org
   7  *   Lustre is a trademark of Cluster File Systems, Inc.
   8  *
   9  *   You may have signed or agreed to another license before downloading
  10  *   this software.  If so, you are bound by the terms and conditions
  11  *   of that agreement, and the following does not apply to you.  See the
  12  *   LICENSE file included with this distribution for more information.
  13  *
  14  *   If you did not agree to a different license, then this copy of Lustre
  15  *   is open source software; you can redistribute it and/or modify it
  16  *   under the terms of version 2 of the GNU General Public License as
  17  *   published by the Free Software Foundation.
  18  *
  19  *   In either case, Lustre is distributed in the hope that it will be
  20  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  21  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *   license text for more details.
  23  *
  24  */
  25 #define DEBUG_SUBSYSTEM S_CLASS
  26
  27 #include <linux/version.h>
  28 #include <asm/statfs.h>
  29 #include <obd_cksum.h>
  30 #include <obd_class.h>
  31 #include <lprocfs_status.h>
  32 #include <linux/seq_file.h>
  33 #include "osc_internal.h"
  34
  35 #ifdef LPROCFS
  36 static int osc_rd_active(char *page, char **start, off_t off,
  37                          int count, int *eof, void *data)
  38 {
  39         struct obd_device *dev = data;
  40         int rc;
  41
  42         LPROCFS_CLIMP_CHECK(dev);
  43         rc = snprintf(page, count, "%d\n", !dev->u.cli.cl_import->imp_deactive);
  44         LPROCFS_CLIMP_EXIT(dev);
  45         return rc;
  46 }
  47
  48 static int osc_wr_active(struct file *file, const char *buffer,
  49                          unsigned long count, void *data)
  50 {
  51         struct obd_device *dev = data;
  52         int val, rc;
  53
  54         rc = lprocfs_write_helper(buffer, count, &val);
  55         if (rc)
  56                 return rc;
  57         if (val < 0 || val > 1)
  58                 return -ERANGE;
  59
  60         LPROCFS_CLIMP_CHECK(dev);
  61         /* opposite senses */
  62         if (dev->u.cli.cl_import->imp_deactive == val)
  63                 rc = ptlrpc_set_import_active(dev->u.cli.cl_import, val);
  64         else
  65                 CDEBUG(D_CONFIG, "activate %d: ignoring repeat request\n", val);
  66
  67         LPROCFS_CLIMP_EXIT(dev);
  68         return count;
  69 }
  70
  71 static int osc_rd_max_pages_per_rpc(char *page, char **start, off_t off,
  72                                     int count, int *eof, void *data)
  73 {
  74         struct obd_device *dev = data;
  75         struct client_obd *cli = &dev->u.cli;
  76         int rc;
  77
  78         client_obd_list_lock(&cli->cl_loi_list_lock);
  79         rc = snprintf(page, count, "%d\n", cli->cl_max_pages_per_rpc);
  80         client_obd_list_unlock(&cli->cl_loi_list_lock);
  81         return rc;
  82 }
  83
  84 static int osc_wr_max_pages_per_rpc(struct file *file, const char *buffer,
  85                                     unsigned long count, void *data)
  86 {
  87         struct obd_device *dev = data;
  88         struct client_obd *cli = &dev->u.cli;
  89         struct obd_connect_data *ocd = &cli->cl_import->imp_connect_data;
  90         int val, rc;
  91
  92         rc = lprocfs_write_helper(buffer, count, &val);
  93         if (rc)
  94                 return rc;
  95
  96         LPROCFS_CLIMP_CHECK(dev);
  97         if (val < 1 || val > ocd->ocd_brw_size >> CFS_PAGE_SHIFT) {
  98                 LPROCFS_CLIMP_EXIT(dev);
  99                 return -ERANGE;
 100         }
 101         client_obd_list_lock(&cli->cl_loi_list_lock);
 102         cli->cl_max_pages_per_rpc = val;
 103         client_obd_list_unlock(&cli->cl_loi_list_lock);
 104
 105         LPROCFS_CLIMP_EXIT(dev);
 106         return count;
 107 }
 108
 109 static int osc_rd_max_rpcs_in_flight(char *page, char **start, off_t off,
 110                                      int count, int *eof, void *data)
 111 {
 112         struct obd_device *dev = data;
 113         struct client_obd *cli = &dev->u.cli;
 114         int rc;
 115
 116         client_obd_list_lock(&cli->cl_loi_list_lock);
 117         rc = snprintf(page, count, "%u\n", cli->cl_max_rpcs_in_flight);
 118         client_obd_list_unlock(&cli->cl_loi_list_lock);
 119         return rc;
 120 }
 121
 122 static int osc_wr_max_rpcs_in_flight(struct file *file, const char *buffer,
 123                                      unsigned long count, void *data)
 124 {
 125         struct obd_device *dev = data;
 126         struct client_obd *cli = &dev->u.cli;
 127         struct ptlrpc_request_pool *pool = cli->cl_import->imp_rq_pool;
 128         int val, rc;
 129
 130         rc = lprocfs_write_helper(buffer, count, &val);
 131         if (rc)
 132                 return rc;
 133
 134         if (val < 1 || val > OSC_MAX_RIF_MAX)
 135                 return -ERANGE;
 136
 137         LPROCFS_CLIMP_CHECK(dev);
 138         if (pool && val > cli->cl_max_rpcs_in_flight)
 139                 pool->prp_populate(pool, val-cli->cl_max_rpcs_in_flight);
 140
 141         client_obd_list_lock(&cli->cl_loi_list_lock);
 142         cli->cl_max_rpcs_in_flight = val;
 143         client_obd_list_unlock(&cli->cl_loi_list_lock);
 144
 145         LPROCFS_CLIMP_EXIT(dev);
 146         return count;
 147 }
 148
 149 static int osc_rd_max_dirty_mb(char *page, char **start, off_t off, int count,
 150                                int *eof, void *data)
 151 {
 152         struct obd_device *dev = data;
 153         struct client_obd *cli = &dev->u.cli;
 154         long val;
 155         int mult;
 156
 157         client_obd_list_lock(&cli->cl_loi_list_lock);
 158         val = cli->cl_dirty_max;
 159         client_obd_list_unlock(&cli->cl_loi_list_lock);
 160
 161         mult = 1 << 20;
 162         return lprocfs_read_frac_helper(page, count, val, mult);
 163 }
 164
 165 static int osc_wr_max_dirty_mb(struct file *file, const char *buffer,
 166                                unsigned long count, void *data)
 167 {
 168         struct obd_device *dev = data;
 169         struct client_obd *cli = &dev->u.cli;
 170         int pages_number, mult, rc;
 171
 172         mult = 1 << (20 - CFS_PAGE_SHIFT);
 173         rc = lprocfs_write_frac_helper(buffer, count, &pages_number, mult);
 174         if (rc)
 175                 return rc;
 176
 177         if (pages_number < 0 ||
 178             pages_number > OSC_MAX_DIRTY_MB_MAX << (20 - CFS_PAGE_SHIFT) ||
 179             pages_number > num_physpages / 4) /* 1/4 of RAM */
 180                 return -ERANGE;
 181
 182         client_obd_list_lock(&cli->cl_loi_list_lock);
 183         cli->cl_dirty_max = (obd_count)(pages_number << CFS_PAGE_SHIFT);
 184         osc_wake_cache_waiters(cli);
 185         client_obd_list_unlock(&cli->cl_loi_list_lock);
 186
 187         return count;
 188 }
 189
 190 static int osc_rd_cur_dirty_bytes(char *page, char **start, off_t off,
 191                                   int count, int *eof, void *data)
 192 {
 193         struct obd_device *dev = data;
 194         struct client_obd *cli = &dev->u.cli;
 195         int rc;
 196
 197         client_obd_list_lock(&cli->cl_loi_list_lock);
 198         rc = snprintf(page, count, "%lu\n", cli->cl_dirty);
 199         client_obd_list_unlock(&cli->cl_loi_list_lock);
 200         return rc;
 201 }
 202
 203 static int osc_rd_cur_grant_bytes(char *page, char **start, off_t off,
 204                                   int count, int *eof, void *data)
 205 {
 206         struct obd_device *dev = data;
 207         struct client_obd *cli = &dev->u.cli;
 208         int rc;
 209
 210         client_obd_list_lock(&cli->cl_loi_list_lock);
 211         rc = snprintf(page, count, "%lu\n", cli->cl_avail_grant);
 212         client_obd_list_unlock(&cli->cl_loi_list_lock);
 213         return rc;
 214 }
 215
 216 static int osc_rd_create_count(char *page, char **start, off_t off, int count,
 217                                int *eof, void *data)
 218 {
 219         struct obd_device *obd = data;
 220
 221         if (obd == NULL)
 222                 return 0;
 223
 224         return snprintf(page, count, "%d\n",
 225                         obd->u.cli.cl_oscc.oscc_grow_count);
 226 }
 227
 228 /**
 229  * Set OSC creator's osc_creator::oscc_grow_count
 230  *
 231  * \param file   proc file
 232  * \param buffer buffer containing the value
 233  * \param count  buffer size
 234  * \param data   obd device
 235  *
 236  * \retval \a count
 237  */
 238 static int osc_wr_create_count(struct file *file, const char *buffer,
 239                                unsigned long count, void *data)
 240 {
 241         struct obd_device *obd = data;
 242         int val, rc, i;
 243
 244         if (obd == NULL)
 245                 return 0;
 246
 247         rc = lprocfs_write_helper(buffer, count, &val);
 248         if (rc)
 249                 return rc;
 250
 251         /* The MDT ALWAYS needs to limit the precreate count to
 252          * OST_MAX_PRECREATE, and the constant cannot be changed
 253          * because it is a value shared between the OSC and OST
 254          * that is the maximum possible number of objects that will
 255          * ever be handled by MDT->OST recovery processing.
 256          *
 257          * If the OST ever gets a request to delete more orphans,
 258          * this implies that something has gone badly on the MDT
 259          * and the OST will refuse to delete so much data from the
 260          * filesystem as a safety measure. */
 261         if (val < OST_MIN_PRECREATE || val > OST_MAX_PRECREATE)
 262                 return -ERANGE;
 263         if (val > obd->u.cli.cl_oscc.oscc_max_grow_count)
 264                 return -ERANGE;
 265
 266         for (i = 1; (i << 1) <= val; i <<= 1)
 267                 ;
 268         obd->u.cli.cl_oscc.oscc_grow_count = i;
 269
 270         return count;
 271 }
 272
 273 /**
 274  * Read OSC creator's osc_creator::oscc_max_grow_count
 275  *
 276  * \param page       buffer to hold the returning string
 277  * \param start
 278  * \param off
 279  * \param count
 280  * \param eof
 281  *              proc read function parameters, please refer to kernel
 282  *              code fs/proc/generic.c proc_file_read()
 283  * \param data   obd device
 284  *
 285  * \retval number of characters printed.
 286  */
 287 static int osc_rd_max_create_count(char *page, char **start, off_t off,
 288                                    int count, int *eof, void *data)
 289 {
 290         struct obd_device *obd = data;
 291
 292         if (obd == NULL)
 293                 return 0;
 294
 295         return snprintf(page, count, "%d\n",
 296                         obd->u.cli.cl_oscc.oscc_max_grow_count);
 297 }
 298
 299 /**
 300  * Set OSC creator's osc_creator::oscc_max_grow_count
 301  *
 302  * \param file   proc file
 303  * \param buffer buffer containing the value
 304  * \param count  buffer size
 305  * \param data   obd device
 306  *
 307  * \retval \a count
 308  */
 309 static int osc_wr_max_create_count(struct file *file, const char *buffer,
 310                                    unsigned long count, void *data)
 311 {
 312         struct obd_device *obd = data;
 313         int val, rc;
 314
 315         if (obd == NULL)
 316                 return 0;
 317
 318         rc = lprocfs_write_helper(buffer, count, &val);
 319         if (rc)
 320                 return rc;
 321
 322         if (val < 0)
 323                 return -ERANGE;
 324         if (val > OST_MAX_PRECREATE)
 325                 return -ERANGE;
 326
 327         if (obd->u.cli.cl_oscc.oscc_grow_count > val)
 328                 obd->u.cli.cl_oscc.oscc_grow_count = val;
 329
 330         obd->u.cli.cl_oscc.oscc_max_grow_count = val;
 331
 332         return count;
 333 }
 334
 335 static int osc_rd_prealloc_next_id(char *page, char **start, off_t off,
 336                                    int count, int *eof, void *data)
 337 {
 338         struct obd_device *obd = data;
 339
 340         if (obd == NULL)
 341                 return 0;
 342
 343         return snprintf(page, count, LPU64"\n",
 344                         obd->u.cli.cl_oscc.oscc_next_id);
 345 }
 346
 347 static int osc_rd_prealloc_last_id(char *page, char **start, off_t off,
 348                                    int count, int *eof, void *data)
 349 {
 350         struct obd_device *obd = data;
 351
 352         if (obd == NULL)
 353                 return 0;
 354
 355         return snprintf(page, count, LPU64"\n",
 356                         obd->u.cli.cl_oscc.oscc_last_id);
 357 }
 358
 359 static int osc_rd_checksum(char *page, char **start, off_t off, int count,
 360                            int *eof, void *data)
 361 {
 362         struct obd_device *obd = data;
 363
 364         if (obd == NULL)
 365                 return 0;
 366
 367         return snprintf(page, count, "%d\n",
 368                         obd->u.cli.cl_checksum ? 1 : 0);
 369 }
 370
 371 static int osc_wr_checksum(struct file *file, const char *buffer,
 372                            unsigned long count, void *data)
 373 {
 374         struct obd_device *obd = data;
 375         int val, rc;
 376
 377         if (obd == NULL)
 378                 return 0;
 379
 380         rc = lprocfs_write_helper(buffer, count, &val);
 381         if (rc)
 382                 return rc;
 383
 384         obd->u.cli.cl_checksum = (val ? 1 : 0);
 385
 386         return count;
 387 }
 388
 389 static int osc_rd_checksum_type(char *page, char **start, off_t off, int count,
 390                                 int *eof, void *data)
 391 {
 392         struct obd_device *obd = data;
 393         int i, len =0;
 394         DECLARE_CKSUM_NAME;
 395
 396         if (obd == NULL)
 397                 return 0;
 398
 399         for (i = 0; i < ARRAY_SIZE(cksum_name) && len < count; i++) {
 400                 if (((1 << i) & obd->u.cli.cl_supp_cksum_types) == 0)
 401                         continue;
 402                 if (obd->u.cli.cl_cksum_type == (1 << i))
 403                         len += snprintf(page + len, count - len, "[%s] ",
 404                                         cksum_name[i]);
 405                 else
 406                         len += snprintf(page + len, count - len, "%s ",
 407                                         cksum_name[i]);
 408         }
 409         if (len < count)
 410                 len += sprintf(page + len, "\n");
 411         return len;
 412 }
 413
 414 static int osc_wd_checksum_type(struct file *file, const char *buffer,
 415                                 unsigned long count, void *data)
 416 {
 417         struct obd_device *obd = data;
 418         int i;
 419         DECLARE_CKSUM_NAME;
 420         char kernbuf[10];
 421
 422         if (obd == NULL)
 423                 return 0;
 424
 425         if (count > sizeof(kernbuf) - 1)
 426                 return -EINVAL;
 427         if (copy_from_user(kernbuf, buffer, count))
 428                 return -EFAULT;
 429         if (count > 0 && kernbuf[count - 1] == '\n')
 430                 kernbuf[count - 1] = '\0';
 431         else
 432                 kernbuf[count] = '\0';
 433
 434         for (i = 0; i < ARRAY_SIZE(cksum_name); i++) {
 435                 if (((1 << i) & obd->u.cli.cl_supp_cksum_types) == 0)
 436                         continue;
 437                 if (!strcmp(kernbuf, cksum_name[i])) {
 438                        obd->u.cli.cl_cksum_type = 1 << i;
 439                        return count;
 440                 }
 441         }
 442         return -EINVAL;
 443 }
 444
 445 static int osc_rd_resend_count(char *page, char **start, off_t off, int count,
 446                                int *eof, void *data)
 447 {
 448         struct obd_device *obd = data;
 449
 450         return snprintf(page, count, "%u\n", atomic_read(&obd->u.cli.cl_resends));
 451 }
 452
 453 static int osc_wr_resend_count(struct file *file, const char *buffer,
 454                                unsigned long count, void *data)
 455 {
 456         struct obd_device *obd = data;
 457         int val, rc;
 458
 459         rc = lprocfs_write_helper(buffer, count, &val);
 460         if (rc)
 461                 return rc;
 462
 463         if (val < 0)
 464                return -EINVAL;
 465
 466         atomic_set(&obd->u.cli.cl_resends, val);
 467
 468         return count;
 469 }
 470
 471 static struct lprocfs_vars lprocfs_osc_obd_vars[] = {
 472         { "uuid",            lprocfs_rd_uuid,        0, 0 },
 473         { "ping",            0, lprocfs_wr_ping,        0 },
 474         { "connect_flags",   lprocfs_rd_connect_flags, 0, 0 },
 475         { "blocksize",       lprocfs_rd_blksize,     0, 0 },
 476         { "kbytestotal",     lprocfs_rd_kbytestotal, 0, 0 },
 477         { "kbytesfree",      lprocfs_rd_kbytesfree,  0, 0 },
 478         { "kbytesavail",     lprocfs_rd_kbytesavail, 0, 0 },
 479         { "filestotal",      lprocfs_rd_filestotal,  0, 0 },
 480         { "filesfree",       lprocfs_rd_filesfree,   0, 0 },
 481         //{ "filegroups",      lprocfs_rd_filegroups,  0, 0 },
 482         { "ost_server_uuid", lprocfs_rd_server_uuid, 0, 0 },
 483         { "ost_conn_uuid",   lprocfs_rd_conn_uuid, 0, 0 },
 484         { "active",          osc_rd_active,
 485                              osc_wr_active, 0 },
 486         { "max_pages_per_rpc", osc_rd_max_pages_per_rpc,
 487                                osc_wr_max_pages_per_rpc, 0 },
 488         { "max_rpcs_in_flight", osc_rd_max_rpcs_in_flight,
 489                                 osc_wr_max_rpcs_in_flight, 0 },
 490         { "max_dirty_mb",    osc_rd_max_dirty_mb, osc_wr_max_dirty_mb, 0 },
 491         { "cur_dirty_bytes", osc_rd_cur_dirty_bytes, 0, 0 },
 492         { "cur_grant_bytes", osc_rd_cur_grant_bytes, 0, 0 },
 493         { "create_count",    osc_rd_create_count, osc_wr_create_count, 0 },
 494         { "max_create_count", osc_rd_max_create_count,
 495                               osc_wr_max_create_count, 0},
 496         { "prealloc_next_id", osc_rd_prealloc_next_id, 0, 0 },
 497         { "prealloc_last_id", osc_rd_prealloc_last_id, 0, 0 },
 498         { "checksums",       osc_rd_checksum, osc_wr_checksum, 0 },
 499         { "checksum_type",   osc_rd_checksum_type, osc_wd_checksum_type, 0 },
 500         { "resend_count",    osc_rd_resend_count, osc_wr_resend_count, 0},
 501         { "timeouts",        lprocfs_rd_timeouts,      0, 0 },
 502         { 0 }
 503 };
 504
 505 static struct lprocfs_vars lprocfs_osc_module_vars[] = {
 506         { "num_refs",        lprocfs_rd_numrefs,     0, 0 },
 507         { 0 }
 508 };
 509
 510 #define pct(a,b) (b ? a * 100 / b : 0)
 511
 512 static int osc_rpc_stats_seq_show(struct seq_file *seq, void *v)
 513 {
 514         struct timeval now;
 515         struct obd_device *dev = seq->private;
 516         struct client_obd *cli = &dev->u.cli;
 517         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
 518         int i;
 519
 520         do_gettimeofday(&now);
 521
 522         client_obd_list_lock(&cli->cl_loi_list_lock);
 523
 524         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
 525                    now.tv_sec, now.tv_usec);
 526         seq_printf(seq, "read RPCs in flight:  %d\n",
 527                    cli->cl_r_in_flight);
 528         seq_printf(seq, "write RPCs in flight: %d\n",
 529                    cli->cl_w_in_flight);
 530         seq_printf(seq, "pending write pages:  %d\n",
 531                    cli->cl_pending_w_pages);
 532         seq_printf(seq, "pending read pages:   %d\n",
 533                    cli->cl_pending_r_pages);
 534
 535         seq_printf(seq, "\n\t\t\tread\t\t\twrite\n");
 536         seq_printf(seq, "pages per rpc         rpcs   %% cum %% |");
 537         seq_printf(seq, "       rpcs   %% cum %%\n");
 538
 539         read_tot = lprocfs_oh_sum(&cli->cl_read_page_hist);
 540         write_tot = lprocfs_oh_sum(&cli->cl_write_page_hist);
 541
 542         read_cum = 0;
 543         write_cum = 0;
 544         for (i = 0; i < OBD_HIST_MAX; i++) {
 545                 unsigned long r = cli->cl_read_page_hist.oh_buckets[i];
 546                 unsigned long w = cli->cl_write_page_hist.oh_buckets[i];
 547                 read_cum += r;
 548                 write_cum += w;
 549                 seq_printf(seq, "%d:\t\t%10lu %3lu %3lu   | %10lu %3lu %3lu\n",
 550                                  1 << i, r, pct(r, read_tot),
 551                                  pct(read_cum, read_tot), w,
 552                                  pct(w, write_tot),
 553                                  pct(write_cum, write_tot));
 554                 if (read_cum == read_tot && write_cum == write_tot)
 555                         break;
 556         }
 557
 558         seq_printf(seq, "\n\t\t\tread\t\t\twrite\n");
 559         seq_printf(seq, "rpcs in flight        rpcs   %% cum %% |");
 560         seq_printf(seq, "       rpcs   %% cum %%\n");
 561
 562         read_tot = lprocfs_oh_sum(&cli->cl_read_rpc_hist);
 563         write_tot = lprocfs_oh_sum(&cli->cl_write_rpc_hist);
 564
 565         read_cum = 0;
 566         write_cum = 0;
 567         for (i = 0; i < OBD_HIST_MAX; i++) {
 568                 unsigned long r = cli->cl_read_rpc_hist.oh_buckets[i];
 569                 unsigned long w = cli->cl_write_rpc_hist.oh_buckets[i];
 570                 read_cum += r;
 571                 write_cum += w;
 572                 seq_printf(seq, "%d:\t\t%10lu %3lu %3lu   | %10lu %3lu %3lu\n",
 573                                  i, r, pct(r, read_tot),
 574                                  pct(read_cum, read_tot), w,
 575                                  pct(w, write_tot),
 576                                  pct(write_cum, write_tot));
 577                 if (read_cum == read_tot && write_cum == write_tot)
 578                         break;
 579         }
 580
 581         seq_printf(seq, "\n\t\t\tread\t\t\twrite\n");
 582         seq_printf(seq, "offset                rpcs   %% cum %% |");
 583         seq_printf(seq, "       rpcs   %% cum %%\n");
 584
 585         read_tot = lprocfs_oh_sum(&cli->cl_read_offset_hist);
 586         write_tot = lprocfs_oh_sum(&cli->cl_write_offset_hist);
 587
 588         read_cum = 0;
 589         write_cum = 0;
 590         for (i = 0; i < OBD_HIST_MAX; i++) {
 591                 unsigned long r = cli->cl_read_offset_hist.oh_buckets[i];
 592                 unsigned long w = cli->cl_write_offset_hist.oh_buckets[i];
 593                 read_cum += r;
 594                 write_cum += w;
 595                 seq_printf(seq, "%d:\t\t%10lu %3lu %3lu   | %10lu %3lu %3lu\n",
 596                            (i == 0) ? 0 : 1 << (i - 1),
 597                            r, pct(r, read_tot), pct(read_cum, read_tot),
 598                            w, pct(w, write_tot), pct(write_cum, write_tot));
 599                 if (read_cum == read_tot && write_cum == write_tot)
 600                         break;
 601         }
 602
 603         client_obd_list_unlock(&cli->cl_loi_list_lock);
 604
 605         return 0;
 606 }
 607 #undef pct
 608
 609 static ssize_t osc_rpc_stats_seq_write(struct file *file, const char *buf,
 610                                        size_t len, loff_t *off)
 611 {
 612         struct seq_file *seq = file->private_data;
 613         struct obd_device *dev = seq->private;
 614         struct client_obd *cli = &dev->u.cli;
 615
 616         lprocfs_oh_clear(&cli->cl_read_rpc_hist);
 617         lprocfs_oh_clear(&cli->cl_write_rpc_hist);
 618         lprocfs_oh_clear(&cli->cl_read_page_hist);
 619         lprocfs_oh_clear(&cli->cl_write_page_hist);
 620         lprocfs_oh_clear(&cli->cl_read_offset_hist);
 621         lprocfs_oh_clear(&cli->cl_write_offset_hist);
 622
 623         return len;
 624 }
 625
 626 LPROC_SEQ_FOPS(osc_rpc_stats);
 627
 628 int lproc_osc_attach_seqstat(struct obd_device *dev)
 629 {
 630         return lprocfs_obd_seq_create(dev, "rpc_stats", 0444,
 631                                       &osc_rpc_stats_fops, dev);
 632 }
 633
 634 void lprocfs_osc_init_vars(struct lprocfs_static_vars *lvars)
 635 {
 636         lvars->module_vars = lprocfs_osc_module_vars;
 637         lvars->obd_vars    = lprocfs_osc_obd_vars;
 638 }
 639 #endif /* LPROCFS */
 640