lustre/llite/lproc_llite.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) 2012, 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 #define DEBUG_SUBSYSTEM S_LLITE
  37
  38 #include <linux/version.h>
  39 #include <linux/user_namespace.h>
  40 #ifdef HAVE_UIDGID_HEADER
  41 # include <linux/uidgid.h>
  42 #endif
  43 #include <lustre_param.h>
  44 #include <lprocfs_status.h>
  45 #include <obd_support.h>
  46
  47 #include "llite_internal.h"
  48 #include "vvp_internal.h"
  49
  50 struct proc_dir_entry *proc_lustre_fs_root;
  51
  52 #ifdef CONFIG_PROC_FS
  53 /* /proc/lustre/llite mount point registration */
  54 static const struct file_operations ll_rw_extents_stats_fops;
  55 static const struct file_operations ll_rw_extents_stats_pp_fops;
  56 static const struct file_operations ll_rw_offset_stats_fops;
  57
  58 static int ll_blksize_seq_show(struct seq_file *m, void *v)
  59 {
  60         struct super_block *sb = m->private;
  61         struct obd_statfs osfs;
  62         int rc;
  63
  64         LASSERT(sb != NULL);
  65         rc = ll_statfs_internal(sb, &osfs,
  66                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
  67                                 OBD_STATFS_NODELAY);
  68         if (!rc)
  69                 rc = seq_printf(m, "%u\n", osfs.os_bsize);
  70         return rc;
  71 }
  72 LPROC_SEQ_FOPS_RO(ll_blksize);
  73
  74 static int ll_kbytestotal_seq_show(struct seq_file *m, void *v)
  75 {
  76         struct super_block *sb = m->private;
  77         struct obd_statfs osfs;
  78         int rc;
  79
  80         LASSERT(sb != NULL);
  81         rc = ll_statfs_internal(sb, &osfs,
  82                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
  83                                 OBD_STATFS_NODELAY);
  84         if (!rc) {
  85                 __u32 blk_size = osfs.os_bsize >> 10;
  86                 __u64 result = osfs.os_blocks;
  87
  88                 while (blk_size >>= 1)
  89                         result <<= 1;
  90
  91                 rc = seq_printf(m, LPU64"\n", result);
  92         }
  93         return rc;
  94 }
  95 LPROC_SEQ_FOPS_RO(ll_kbytestotal);
  96
  97 static int ll_kbytesfree_seq_show(struct seq_file *m, void *v)
  98 {
  99         struct super_block *sb = m->private;
 100         struct obd_statfs osfs;
 101         int rc;
 102
 103         LASSERT(sb != NULL);
 104         rc = ll_statfs_internal(sb, &osfs,
 105                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 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                 rc = seq_printf(m, LPU64"\n", result);
 115         }
 116         return rc;
 117 }
 118 LPROC_SEQ_FOPS_RO(ll_kbytesfree);
 119
 120 static int ll_kbytesavail_seq_show(struct seq_file *m, void *v)
 121 {
 122         struct super_block *sb = m->private;
 123         struct obd_statfs osfs;
 124         int rc;
 125
 126         LASSERT(sb != NULL);
 127         rc = ll_statfs_internal(sb, &osfs,
 128                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 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                 rc = seq_printf(m, LPU64"\n", result);
 138         }
 139         return rc;
 140 }
 141 LPROC_SEQ_FOPS_RO(ll_kbytesavail);
 142
 143 static int ll_filestotal_seq_show(struct seq_file *m, void *v)
 144 {
 145         struct super_block *sb = m->private;
 146         struct obd_statfs osfs;
 147         int rc;
 148
 149         LASSERT(sb != NULL);
 150         rc = ll_statfs_internal(sb, &osfs,
 151                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 152                                 OBD_STATFS_NODELAY);
 153         if (!rc)
 154                 rc = seq_printf(m, LPU64"\n", osfs.os_files);
 155         return rc;
 156 }
 157 LPROC_SEQ_FOPS_RO(ll_filestotal);
 158
 159 static int ll_filesfree_seq_show(struct seq_file *m, void *v)
 160 {
 161         struct super_block *sb = m->private;
 162         struct obd_statfs osfs;
 163         int rc;
 164
 165         LASSERT(sb != NULL);
 166         rc = ll_statfs_internal(sb, &osfs,
 167                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 168                                 OBD_STATFS_NODELAY);
 169         if (!rc)
 170                 rc = seq_printf(m, LPU64"\n", osfs.os_ffree);
 171         return rc;
 172 }
 173 LPROC_SEQ_FOPS_RO(ll_filesfree);
 174
 175 static int ll_client_type_seq_show(struct seq_file *m, void *v)
 176 {
 177         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 178         int rc;
 179
 180         LASSERT(sbi != NULL);
 181
 182         if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
 183                 rc = seq_printf(m, "remote client\n");
 184         else
 185                 rc = seq_printf(m, "local client\n");
 186         return rc;
 187 }
 188 LPROC_SEQ_FOPS_RO(ll_client_type);
 189
 190 static int ll_fstype_seq_show(struct seq_file *m, void *v)
 191 {
 192         struct super_block *sb = m->private;
 193
 194         LASSERT(sb != NULL);
 195         return seq_printf(m, "%s\n", sb->s_type->name);
 196 }
 197 LPROC_SEQ_FOPS_RO(ll_fstype);
 198
 199 static int ll_sb_uuid_seq_show(struct seq_file *m, void *v)
 200 {
 201         struct super_block *sb = m->private;
 202
 203         LASSERT(sb != NULL);
 204         return seq_printf(m, "%s\n", ll_s2sbi(sb)->ll_sb_uuid.uuid);
 205 }
 206 LPROC_SEQ_FOPS_RO(ll_sb_uuid);
 207
 208 static int ll_xattr_cache_seq_show(struct seq_file *m, void *v)
 209 {
 210         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 211
 212         return seq_printf(m, "%u\n", sbi->ll_xattr_cache_enabled);
 213 }
 214
 215 static ssize_t ll_xattr_cache_seq_write(struct file *file,
 216                                         const char __user *buffer,
 217                                         size_t count, loff_t *off)
 218 {
 219         struct seq_file *m = file->private_data;
 220         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 221         int val, rc;
 222
 223         rc = lprocfs_write_helper(buffer, count, &val);
 224         if (rc)
 225                 return rc;
 226
 227         if (val != 0 && val != 1)
 228                 return -ERANGE;
 229
 230         if (val == 1 && !(sbi->ll_flags & LL_SBI_XATTR_CACHE))
 231                 return -ENOTSUPP;
 232
 233         sbi->ll_xattr_cache_enabled = val;
 234
 235         return count;
 236 }
 237 LPROC_SEQ_FOPS(ll_xattr_cache);
 238
 239 static int ll_site_stats_seq_show(struct seq_file *m, void *v)
 240 {
 241         struct super_block *sb = m->private;
 242
 243         /*
 244          * See description of statistical counters in struct cl_site, and
 245          * struct lu_site.
 246          */
 247         return cl_site_stats_print(lu2cl_site(ll_s2sbi(sb)->ll_site), m);
 248 }
 249 LPROC_SEQ_FOPS_RO(ll_site_stats);
 250
 251 static int ll_max_readahead_mb_seq_show(struct seq_file *m, void *v)
 252 {
 253         struct super_block *sb = m->private;
 254         struct ll_sb_info *sbi = ll_s2sbi(sb);
 255         long pages_number;
 256         int mult;
 257
 258         spin_lock(&sbi->ll_lock);
 259         pages_number = sbi->ll_ra_info.ra_max_pages;
 260         spin_unlock(&sbi->ll_lock);
 261
 262         mult = 1 << (20 - PAGE_CACHE_SHIFT);
 263         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 264 }
 265
 266 static ssize_t
 267 ll_max_readahead_mb_seq_write(struct file *file, const char __user *buffer,
 268                               size_t count, loff_t *off)
 269 {
 270         struct seq_file *m = file->private_data;
 271         struct super_block *sb = m->private;
 272         struct ll_sb_info *sbi = ll_s2sbi(sb);
 273         __u64 val;
 274         long pages_number;
 275         int pages_shift;
 276         int rc;
 277
 278         pages_shift = 20 - PAGE_CACHE_SHIFT;
 279         rc = lprocfs_write_frac_u64_helper(buffer, count, &val,
 280                                            1 << pages_shift);
 281         if (rc)
 282                 return rc;
 283
 284         if (val > LONG_MAX)
 285                 return -ERANGE;
 286         pages_number = (long)val;
 287
 288         if (pages_number < 0 || pages_number > totalram_pages / 2) {
 289                 /* 1/2 of RAM */
 290                 CERROR("%s: can't set max_readahead_mb=%lu > %luMB\n",
 291                        ll_get_fsname(sb, NULL, 0), pages_number >> pages_shift,
 292                        totalram_pages >> (pages_shift + 1));
 293                 return -ERANGE;
 294         }
 295
 296         spin_lock(&sbi->ll_lock);
 297         sbi->ll_ra_info.ra_max_pages = pages_number;
 298         spin_unlock(&sbi->ll_lock);
 299         return count;
 300 }
 301 LPROC_SEQ_FOPS(ll_max_readahead_mb);
 302
 303 static int ll_max_readahead_per_file_mb_seq_show(struct seq_file *m, void *v)
 304 {
 305         struct super_block *sb = m->private;
 306         struct ll_sb_info *sbi = ll_s2sbi(sb);
 307         long pages_number;
 308         int mult;
 309
 310         spin_lock(&sbi->ll_lock);
 311         pages_number = sbi->ll_ra_info.ra_max_pages_per_file;
 312         spin_unlock(&sbi->ll_lock);
 313
 314         mult = 1 << (20 - PAGE_CACHE_SHIFT);
 315         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 316 }
 317
 318 static ssize_t
 319 ll_max_readahead_per_file_mb_seq_write(struct file *file,
 320                                        const char __user *buffer,
 321                                        size_t count, loff_t *off)
 322 {
 323         struct seq_file *m = file->private_data;
 324         struct super_block *sb = m->private;
 325         struct ll_sb_info *sbi = ll_s2sbi(sb);
 326         int pages_shift, rc, pages_number;
 327
 328         pages_shift = 20 - PAGE_CACHE_SHIFT;
 329         rc = lprocfs_write_frac_helper(buffer, count, &pages_number,
 330                                        1 << pages_shift);
 331         if (rc)
 332                 return rc;
 333
 334         if (pages_number < 0 || pages_number > sbi->ll_ra_info.ra_max_pages) {
 335                 CERROR("%s: can't set max_readahead_per_file_mb=%u > "
 336                        "max_read_ahead_mb=%lu\n", ll_get_fsname(sb, NULL, 0),
 337                        pages_number >> pages_shift,
 338                        sbi->ll_ra_info.ra_max_pages >> pages_shift);
 339                 return -ERANGE;
 340         }
 341
 342         spin_lock(&sbi->ll_lock);
 343         sbi->ll_ra_info.ra_max_pages_per_file = pages_number;
 344         spin_unlock(&sbi->ll_lock);
 345         return count;
 346 }
 347 LPROC_SEQ_FOPS(ll_max_readahead_per_file_mb);
 348
 349 static int ll_max_read_ahead_whole_mb_seq_show(struct seq_file *m, void *v)
 350 {
 351         struct super_block *sb = m->private;
 352         struct ll_sb_info *sbi = ll_s2sbi(sb);
 353         long pages_number;
 354         int mult;
 355
 356         spin_lock(&sbi->ll_lock);
 357         pages_number = sbi->ll_ra_info.ra_max_read_ahead_whole_pages;
 358         spin_unlock(&sbi->ll_lock);
 359
 360         mult = 1 << (20 - PAGE_CACHE_SHIFT);
 361         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 362 }
 363
 364 static ssize_t
 365 ll_max_read_ahead_whole_mb_seq_write(struct file *file,
 366                                      const char __user *buffer,
 367                                      size_t count, loff_t *off)
 368 {
 369         struct seq_file *m = file->private_data;
 370         struct super_block *sb = m->private;
 371         struct ll_sb_info *sbi = ll_s2sbi(sb);
 372         int pages_shift, rc, pages_number;
 373
 374         pages_shift = 20 - PAGE_CACHE_SHIFT;
 375         rc = lprocfs_write_frac_helper(buffer, count, &pages_number,
 376                                        1 << pages_shift);
 377         if (rc)
 378                 return rc;
 379
 380         /* Cap this at the current max readahead window size, the readahead
 381          * algorithm does this anyway so it's pointless to set it larger. */
 382         if (pages_number < 0 ||
 383             pages_number > sbi->ll_ra_info.ra_max_pages_per_file) {
 384                 CERROR("%s: can't set max_read_ahead_whole_mb=%u > "
 385                        "max_read_ahead_per_file_mb=%lu\n",
 386                        ll_get_fsname(sb, NULL, 0),
 387                        pages_number >> pages_shift,
 388                        sbi->ll_ra_info.ra_max_pages_per_file >> pages_shift);
 389                 return -ERANGE;
 390         }
 391
 392         spin_lock(&sbi->ll_lock);
 393         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = pages_number;
 394         spin_unlock(&sbi->ll_lock);
 395         return count;
 396 }
 397 LPROC_SEQ_FOPS(ll_max_read_ahead_whole_mb);
 398
 399 static int ll_max_cached_mb_seq_show(struct seq_file *m, void *v)
 400 {
 401         struct super_block     *sb    = m->private;
 402         struct ll_sb_info      *sbi   = ll_s2sbi(sb);
 403         struct cl_client_cache *cache = sbi->ll_cache;
 404         int shift = 20 - PAGE_CACHE_SHIFT;
 405         long max_cached_mb;
 406         long unused_mb;
 407
 408         max_cached_mb = cache->ccc_lru_max >> shift;
 409         unused_mb = atomic_long_read(&cache->ccc_lru_left) >> shift;
 410         return seq_printf(m,
 411                         "users: %d\n"
 412                         "max_cached_mb: %ld\n"
 413                         "used_mb: %ld\n"
 414                         "unused_mb: %ld\n"
 415                         "reclaim_count: %u\n",
 416                         atomic_read(&cache->ccc_users),
 417                         max_cached_mb,
 418                         max_cached_mb - unused_mb,
 419                         unused_mb,
 420                         cache->ccc_lru_shrinkers);
 421 }
 422
 423 static ssize_t
 424 ll_max_cached_mb_seq_write(struct file *file, const char __user *buffer,
 425                            size_t count, loff_t *off)
 426 {
 427         struct seq_file *m = file->private_data;
 428         struct super_block *sb = m->private;
 429         struct ll_sb_info *sbi = ll_s2sbi(sb);
 430         struct cl_client_cache *cache = sbi->ll_cache;
 431         struct lu_env *env;
 432         __u64 val;
 433         long diff = 0;
 434         long nrpages = 0;
 435         long pages_number;
 436         int refcheck;
 437         int mult;
 438         long rc;
 439         char kernbuf[128];
 440         ENTRY;
 441
 442         if (count >= sizeof(kernbuf))
 443                 RETURN(-EINVAL);
 444
 445         if (copy_from_user(kernbuf, buffer, count))
 446                 RETURN(-EFAULT);
 447         kernbuf[count] = 0;
 448
 449         mult = 1 << (20 - PAGE_CACHE_SHIFT);
 450         buffer += lprocfs_find_named_value(kernbuf, "max_cached_mb:", &count) -
 451                   kernbuf;
 452         rc = lprocfs_write_frac_u64_helper(buffer, count, &val, mult);
 453         if (rc)
 454                 RETURN(rc);
 455
 456         if (val > LONG_MAX)
 457                 return -ERANGE;
 458         pages_number = (long)val;
 459
 460         if (pages_number < 0 || pages_number > totalram_pages) {
 461                 CERROR("%s: can't set max cache more than %lu MB\n",
 462                        ll_get_fsname(sb, NULL, 0),
 463                        totalram_pages >> (20 - PAGE_CACHE_SHIFT));
 464                 RETURN(-ERANGE);
 465         }
 466         /* Allow enough cache so clients can make well-formed RPCs */
 467         pages_number = max_t(long, pages_number, PTLRPC_MAX_BRW_PAGES);
 468
 469         spin_lock(&sbi->ll_lock);
 470         diff = pages_number - cache->ccc_lru_max;
 471         spin_unlock(&sbi->ll_lock);
 472
 473         /* easy - add more LRU slots. */
 474         if (diff >= 0) {
 475                 atomic_long_add(diff, &cache->ccc_lru_left);
 476                 GOTO(out, rc = 0);
 477         }
 478
 479         env = cl_env_get(&refcheck);
 480         if (IS_ERR(env))
 481                 RETURN(rc);
 482
 483         diff = -diff;
 484         while (diff > 0) {
 485                 long tmp;
 486
 487                 /* reduce LRU budget from free slots. */
 488                 do {
 489                         long ov, nv;
 490
 491                         ov = atomic_long_read(&cache->ccc_lru_left);
 492                         if (ov == 0)
 493                                 break;
 494
 495                         nv = ov > diff ? ov - diff : 0;
 496                         rc = atomic_long_cmpxchg(&cache->ccc_lru_left, ov, nv);
 497                         if (likely(ov == rc)) {
 498                                 diff -= ov - nv;
 499                                 nrpages += ov - nv;
 500                                 break;
 501                         }
 502                 } while (1);
 503
 504                 if (diff <= 0)
 505                         break;
 506
 507                 if (sbi->ll_dt_exp == NULL) { /* being initialized */
 508                         rc = -ENODEV;
 509                         break;
 510                 }
 511
 512                 /* difficult - have to ask OSCs to drop LRU slots. */
 513                 tmp = diff << 1;
 514                 rc = obd_set_info_async(env, sbi->ll_dt_exp,
 515                                 sizeof(KEY_CACHE_LRU_SHRINK),
 516                                 KEY_CACHE_LRU_SHRINK,
 517                                 sizeof(tmp), &tmp, NULL);
 518                 if (rc < 0)
 519                         break;
 520         }
 521         cl_env_put(env, &refcheck);
 522
 523 out:
 524         if (rc >= 0) {
 525                 spin_lock(&sbi->ll_lock);
 526                 cache->ccc_lru_max = pages_number;
 527                 spin_unlock(&sbi->ll_lock);
 528                 rc = count;
 529         } else {
 530                 atomic_long_add(nrpages, &cache->ccc_lru_left);
 531         }
 532         return rc;
 533 }
 534 LPROC_SEQ_FOPS(ll_max_cached_mb);
 535
 536 static int ll_checksum_seq_show(struct seq_file *m, void *v)
 537 {
 538         struct super_block *sb = m->private;
 539         struct ll_sb_info *sbi = ll_s2sbi(sb);
 540
 541         return seq_printf(m, "%u\n", (sbi->ll_flags & LL_SBI_CHECKSUM) ? 1 : 0);
 542 }
 543
 544 static ssize_t ll_checksum_seq_write(struct file *file,
 545                                      const char __user *buffer,
 546                                      size_t count, loff_t *off)
 547 {
 548         struct seq_file *m = file->private_data;
 549         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 550         int val, rc;
 551
 552         if (!sbi->ll_dt_exp)
 553                 /* Not set up yet */
 554                 return -EAGAIN;
 555
 556         rc = lprocfs_write_helper(buffer, count, &val);
 557         if (rc)
 558                 return rc;
 559         if (val)
 560                 sbi->ll_flags |= LL_SBI_CHECKSUM;
 561         else
 562                 sbi->ll_flags &= ~LL_SBI_CHECKSUM;
 563
 564         rc = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 565                                 KEY_CHECKSUM, sizeof(val), &val, NULL);
 566         if (rc)
 567                 CWARN("Failed to set OSC checksum flags: %d\n", rc);
 568
 569         return count;
 570 }
 571 LPROC_SEQ_FOPS(ll_checksum);
 572
 573 static int ll_max_rw_chunk_seq_show(struct seq_file *m, void *v)
 574 {
 575         struct super_block *sb = m->private;
 576
 577         return seq_printf(m, "%lu\n", ll_s2sbi(sb)->ll_max_rw_chunk);
 578 }
 579
 580 static ssize_t ll_max_rw_chunk_seq_write(struct file *file,
 581                                          const char __user *buffer,
 582                                          size_t count, loff_t *off)
 583 {
 584         struct seq_file *m = file->private_data;
 585         struct super_block *sb = m->private;
 586         int rc, val;
 587
 588         rc = lprocfs_write_helper(buffer, count, &val);
 589         if (rc)
 590                 return rc;
 591         ll_s2sbi(sb)->ll_max_rw_chunk = val;
 592         return count;
 593 }
 594 LPROC_SEQ_FOPS(ll_max_rw_chunk);
 595
 596 static int ll_rd_track_id(struct seq_file *m, enum stats_track_type type)
 597 {
 598         struct super_block *sb = m->private;
 599
 600         if (ll_s2sbi(sb)->ll_stats_track_type == type) {
 601                 return seq_printf(m, "%d\n",
 602                                   ll_s2sbi(sb)->ll_stats_track_id);
 603         } else if (ll_s2sbi(sb)->ll_stats_track_type == STATS_TRACK_ALL) {
 604                 return seq_printf(m, "0 (all)\n");
 605         } else {
 606                 return seq_printf(m, "untracked\n");
 607         }
 608 }
 609
 610 static int ll_wr_track_id(const char __user *buffer, unsigned long count,
 611                           void *data, enum stats_track_type type)
 612 {
 613         struct super_block *sb = data;
 614         int rc, pid;
 615
 616         rc = lprocfs_write_helper(buffer, count, &pid);
 617         if (rc)
 618                 return rc;
 619         ll_s2sbi(sb)->ll_stats_track_id = pid;
 620         if (pid == 0)
 621                 ll_s2sbi(sb)->ll_stats_track_type = STATS_TRACK_ALL;
 622         else
 623                 ll_s2sbi(sb)->ll_stats_track_type = type;
 624         lprocfs_clear_stats(ll_s2sbi(sb)->ll_stats);
 625         return count;
 626 }
 627
 628 static int ll_track_pid_seq_show(struct seq_file *m, void *v)
 629 {
 630         return ll_rd_track_id(m, STATS_TRACK_PID);
 631 }
 632
 633 static ssize_t ll_track_pid_seq_write(struct file *file,
 634                                       const char __user *buffer,
 635                                       size_t count, loff_t *off)
 636 {
 637         struct seq_file *seq = file->private_data;
 638         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PID);
 639 }
 640 LPROC_SEQ_FOPS(ll_track_pid);
 641
 642 static int ll_track_ppid_seq_show(struct seq_file *m, void *v)
 643 {
 644         return ll_rd_track_id(m, STATS_TRACK_PPID);
 645 }
 646
 647 static ssize_t ll_track_ppid_seq_write(struct file *file,
 648                                        const char __user *buffer,
 649                                        size_t count, loff_t *off)
 650 {
 651         struct seq_file *seq = file->private_data;
 652         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PPID);
 653 }
 654 LPROC_SEQ_FOPS(ll_track_ppid);
 655
 656 static int ll_track_gid_seq_show(struct seq_file *m, void *v)
 657 {
 658         return ll_rd_track_id(m, STATS_TRACK_GID);
 659 }
 660
 661 static ssize_t ll_track_gid_seq_write(struct file *file,
 662                                       const char __user *buffer,
 663                                       size_t count, loff_t *off)
 664 {
 665         struct seq_file *seq = file->private_data;
 666         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_GID);
 667 }
 668 LPROC_SEQ_FOPS(ll_track_gid);
 669
 670 static int ll_statahead_max_seq_show(struct seq_file *m, void *v)
 671 {
 672         struct super_block *sb = m->private;
 673         struct ll_sb_info *sbi = ll_s2sbi(sb);
 674
 675         return seq_printf(m, "%u\n", sbi->ll_sa_max);
 676 }
 677
 678 static ssize_t ll_statahead_max_seq_write(struct file *file,
 679                                           const char __user *buffer,
 680                                           size_t count, loff_t *off)
 681 {
 682         struct seq_file *m = file->private_data;
 683         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 684         int val, rc;
 685
 686         rc = lprocfs_write_helper(buffer, count, &val);
 687         if (rc)
 688                 return rc;
 689
 690         if (val >= 0 && val <= LL_SA_RPC_MAX)
 691                 sbi->ll_sa_max = val;
 692         else
 693                 CERROR("Bad statahead_max value %d. Valid values are in the "
 694                        "range [0, %d]\n", val, LL_SA_RPC_MAX);
 695
 696         return count;
 697 }
 698 LPROC_SEQ_FOPS(ll_statahead_max);
 699
 700 static int ll_statahead_agl_seq_show(struct seq_file *m, void *v)
 701 {
 702         struct super_block *sb = m->private;
 703         struct ll_sb_info *sbi = ll_s2sbi(sb);
 704
 705         return seq_printf(m, "%u\n",
 706                           sbi->ll_flags & LL_SBI_AGL_ENABLED ? 1 : 0);
 707 }
 708
 709 static ssize_t ll_statahead_agl_seq_write(struct file *file,
 710                                           const char __user *buffer,
 711                                           size_t count, loff_t *off)
 712 {
 713         struct seq_file *m = file->private_data;
 714         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 715         int val, rc;
 716
 717         rc = lprocfs_write_helper(buffer, count, &val);
 718         if (rc)
 719                 return rc;
 720
 721         if (val)
 722                 sbi->ll_flags |= LL_SBI_AGL_ENABLED;
 723         else
 724                 sbi->ll_flags &= ~LL_SBI_AGL_ENABLED;
 725
 726         return count;
 727 }
 728 LPROC_SEQ_FOPS(ll_statahead_agl);
 729
 730 static int ll_statahead_stats_seq_show(struct seq_file *m, void *v)
 731 {
 732         struct super_block *sb = m->private;
 733         struct ll_sb_info *sbi = ll_s2sbi(sb);
 734
 735         return seq_printf(m,
 736                         "statahead total: %u\n"
 737                         "statahead wrong: %u\n"
 738                         "agl total: %u\n",
 739                         atomic_read(&sbi->ll_sa_total),
 740                         atomic_read(&sbi->ll_sa_wrong),
 741                         atomic_read(&sbi->ll_agl_total));
 742 }
 743 LPROC_SEQ_FOPS_RO(ll_statahead_stats);
 744
 745 static int ll_lazystatfs_seq_show(struct seq_file *m, void *v)
 746 {
 747         struct super_block *sb = m->private;
 748         struct ll_sb_info *sbi = ll_s2sbi(sb);
 749
 750         return seq_printf(m, "%u\n",
 751                           (sbi->ll_flags & LL_SBI_LAZYSTATFS) ? 1 : 0);
 752 }
 753
 754 static ssize_t ll_lazystatfs_seq_write(struct file *file,
 755                                        const char __user *buffer,
 756                                         size_t count, loff_t *off)
 757 {
 758         struct seq_file *m = file->private_data;
 759         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 760         int val, rc;
 761
 762         rc = lprocfs_write_helper(buffer, count, &val);
 763         if (rc)
 764                 return rc;
 765
 766         if (val)
 767                 sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 768         else
 769                 sbi->ll_flags &= ~LL_SBI_LAZYSTATFS;
 770
 771         return count;
 772 }
 773 LPROC_SEQ_FOPS(ll_lazystatfs);
 774
 775 static int ll_max_easize_seq_show(struct seq_file *m, void *v)
 776 {
 777         struct super_block *sb = m->private;
 778         struct ll_sb_info *sbi = ll_s2sbi(sb);
 779         unsigned int ealen;
 780         int rc;
 781
 782         rc = ll_get_max_mdsize(sbi, &ealen);
 783         if (rc)
 784                 return rc;
 785
 786         return seq_printf(m, "%u\n", ealen);
 787 }
 788 LPROC_SEQ_FOPS_RO(ll_max_easize);
 789
 790 /**
 791  * Get default_easize.
 792  *
 793  * \see client_obd::cl_default_mds_easize
 794  *
 795  * \param[in] m         seq_file handle
 796  * \param[in] v         unused for single entry
 797  *
 798  * \retval 0            on success
 799  * \retval negative     negated errno on failure
 800  */
 801 static int ll_default_easize_seq_show(struct seq_file *m, void *v)
 802 {
 803         struct super_block *sb = m->private;
 804         struct ll_sb_info *sbi = ll_s2sbi(sb);
 805         unsigned int ealen;
 806         int rc;
 807
 808         rc = ll_get_default_mdsize(sbi, &ealen);
 809         if (rc)
 810                 return rc;
 811
 812         return seq_printf(m, "%u\n", ealen);
 813 }
 814
 815 /**
 816  * Set default_easize.
 817  *
 818  * Range checking on the passed value is handled by
 819  * ll_set_default_mdsize().
 820  *
 821  * \see client_obd::cl_default_mds_easize
 822  *
 823  * \param[in] file      proc file
 824  * \param[in] buffer    string passed from user space
 825  * \param[in] count     \a buffer length
 826  * \param[in] off       unused for single entry
 827  *
 828  * \retval positive     \a count on success
 829  * \retval negative     negated errno on failure
 830  */
 831 static ssize_t ll_default_easize_seq_write(struct file *file,
 832                                            const char __user *buffer,
 833                                            size_t count, loff_t *unused)
 834 {
 835         struct seq_file         *seq = file->private_data;
 836         struct super_block      *sb = (struct super_block *)seq->private;
 837         struct ll_sb_info       *sbi = ll_s2sbi(sb);
 838         int                      val;
 839         int                      rc;
 840
 841         if (count == 0)
 842                 return 0;
 843
 844         rc = lprocfs_write_helper(buffer, count, &val);
 845         if (rc < 0)
 846                 return rc;
 847
 848         rc = ll_set_default_mdsize(sbi, val);
 849         if (rc)
 850                 return rc;
 851
 852         return count;
 853 }
 854 LPROC_SEQ_FOPS(ll_default_easize);
 855
 856 static int ll_max_cookiesize_seq_show(struct seq_file *m, void *v)
 857 {
 858         struct super_block *sb = m->private;
 859         struct ll_sb_info *sbi = ll_s2sbi(sb);
 860         unsigned int cookielen;
 861         int rc;
 862
 863         rc = ll_get_max_cookiesize(sbi, &cookielen);
 864         if (rc)
 865                 return rc;
 866
 867         return seq_printf(m, "%u\n", cookielen);
 868 }
 869 LPROC_SEQ_FOPS_RO(ll_max_cookiesize);
 870
 871 static int ll_default_cookiesize_seq_show(struct seq_file *m, void *v)
 872 {
 873         struct super_block *sb = m->private;
 874         struct ll_sb_info *sbi = ll_s2sbi(sb);
 875         unsigned int cookielen;
 876         int rc;
 877
 878         rc = ll_get_default_cookiesize(sbi, &cookielen);
 879         if (rc)
 880                 return rc;
 881
 882         return seq_printf(m, "%u\n", cookielen);
 883 }
 884 LPROC_SEQ_FOPS_RO(ll_default_cookiesize);
 885
 886 static int ll_sbi_flags_seq_show(struct seq_file *m, void *v)
 887 {
 888         const char *str[] = LL_SBI_FLAGS;
 889         struct super_block *sb = m->private;
 890         int flags = ll_s2sbi(sb)->ll_flags;
 891         int i = 0;
 892
 893         while (flags != 0) {
 894                 if (ARRAY_SIZE(str) <= i) {
 895                         CERROR("%s: Revise array LL_SBI_FLAGS to match sbi "
 896                                 "flags please.\n", ll_get_fsname(sb, NULL, 0));
 897                         return -EINVAL;
 898                 }
 899
 900                 if (flags & 0x1)
 901                         seq_printf(m, "%s ", str[i]);
 902                 flags >>= 1;
 903                 ++i;
 904         }
 905         seq_printf(m, "\b\n");
 906         return 0;
 907 }
 908 LPROC_SEQ_FOPS_RO(ll_sbi_flags);
 909
 910 static int ll_unstable_stats_seq_show(struct seq_file *m, void *v)
 911 {
 912         struct super_block      *sb    = m->private;
 913         struct ll_sb_info       *sbi   = ll_s2sbi(sb);
 914         struct cl_client_cache  *cache = sbi->ll_cache;
 915         long pages;
 916         int mb;
 917
 918         pages = atomic_long_read(&cache->ccc_unstable_nr);
 919         mb    = (pages * PAGE_CACHE_SIZE) >> 20;
 920
 921         return seq_printf(m, "unstable_check:     %8d\n"
 922                              "unstable_pages: %12ld\n"
 923                              "unstable_mb:        %8d\n",
 924                           cache->ccc_unstable_check, pages, mb);
 925 }
 926
 927 static ssize_t ll_unstable_stats_seq_write(struct file *file,
 928                                            const char __user *buffer,
 929                                            size_t count, loff_t *unused)
 930 {
 931         struct seq_file *seq = file->private_data;
 932         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)seq->private);
 933         char kernbuf[128];
 934         int val, rc;
 935
 936         if (count == 0)
 937                 return 0;
 938         if (count >= sizeof(kernbuf))
 939                 return -EINVAL;
 940
 941         if (copy_from_user(kernbuf, buffer, count))
 942                 return -EFAULT;
 943         kernbuf[count] = 0;
 944
 945         buffer += lprocfs_find_named_value(kernbuf, "unstable_check:", &count) -
 946                   kernbuf;
 947         rc = lprocfs_write_helper(buffer, count, &val);
 948         if (rc < 0)
 949                 return rc;
 950
 951         /* borrow lru lock to set the value */
 952         spin_lock(&sbi->ll_cache->ccc_lru_lock);
 953         sbi->ll_cache->ccc_unstable_check = !!val;
 954         spin_unlock(&sbi->ll_cache->ccc_lru_lock);
 955
 956         return count;
 957 }
 958 LPROC_SEQ_FOPS(ll_unstable_stats);
 959
 960 static int ll_root_squash_seq_show(struct seq_file *m, void *v)
 961 {
 962         struct super_block *sb = m->private;
 963         struct ll_sb_info *sbi = ll_s2sbi(sb);
 964         struct root_squash_info *squash = &sbi->ll_squash;
 965
 966         return seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
 967 }
 968
 969 static ssize_t ll_root_squash_seq_write(struct file *file,
 970                                         const char __user *buffer,
 971                                         size_t count, loff_t *off)
 972 {
 973         struct seq_file *m = file->private_data;
 974         struct super_block *sb = m->private;
 975         struct ll_sb_info *sbi = ll_s2sbi(sb);
 976         struct root_squash_info *squash = &sbi->ll_squash;
 977
 978         return lprocfs_wr_root_squash(buffer, count, squash,
 979                                       ll_get_fsname(sb, NULL, 0));
 980 }
 981 LPROC_SEQ_FOPS(ll_root_squash);
 982
 983 static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
 984 {
 985         struct super_block *sb = m->private;
 986         struct ll_sb_info *sbi = ll_s2sbi(sb);
 987         struct root_squash_info *squash = &sbi->ll_squash;
 988         int len, rc;
 989
 990         down_read(&squash->rsi_sem);
 991         if (!list_empty(&squash->rsi_nosquash_nids)) {
 992                 len = cfs_print_nidlist(m->buf + m->count, m->size - m->count,
 993                                         &squash->rsi_nosquash_nids);
 994                 m->count += len;
 995                 rc = seq_printf(m, "\n");
 996         } else {
 997                 rc = seq_printf(m, "NONE\n");
 998         }
 999         up_read(&squash->rsi_sem);
1000
1001         return rc;
1002 }
1003
1004 static ssize_t ll_nosquash_nids_seq_write(struct file *file,
1005                                           const char __user *buffer,
1006                                           size_t count, loff_t *off)
1007 {
1008         struct seq_file *m = file->private_data;
1009         struct super_block *sb = m->private;
1010         struct ll_sb_info *sbi = ll_s2sbi(sb);
1011         struct root_squash_info *squash = &sbi->ll_squash;
1012         int rc;
1013
1014         rc = lprocfs_wr_nosquash_nids(buffer, count, squash,
1015                                       ll_get_fsname(sb, NULL, 0));
1016         if (rc < 0)
1017                 return rc;
1018
1019         ll_compute_rootsquash_state(sbi);
1020
1021         return rc;
1022 }
1023 LPROC_SEQ_FOPS(ll_nosquash_nids);
1024
1025 struct lprocfs_vars lprocfs_llite_obd_vars[] = {
1026         { .name =       "uuid",
1027           .fops =       &ll_sb_uuid_fops                        },
1028         { .name =       "fstype",
1029           .fops =       &ll_fstype_fops                         },
1030         { .name =       "site",
1031           .fops =       &ll_site_stats_fops                     },
1032         { .name =       "blocksize",
1033           .fops =       &ll_blksize_fops                        },
1034         { .name =       "kbytestotal",
1035           .fops =       &ll_kbytestotal_fops                    },
1036         { .name =       "kbytesfree",
1037           .fops =       &ll_kbytesfree_fops                     },
1038         { .name =       "kbytesavail",
1039           .fops =       &ll_kbytesavail_fops                    },
1040         { .name =       "filestotal",
1041           .fops =       &ll_filestotal_fops                     },
1042         { .name =       "filesfree",
1043           .fops =       &ll_filesfree_fops                      },
1044         { .name =       "client_type",
1045           .fops =       &ll_client_type_fops                    },
1046         { .name =       "max_read_ahead_mb",
1047           .fops =       &ll_max_readahead_mb_fops               },
1048         { .name =       "max_read_ahead_per_file_mb",
1049           .fops =       &ll_max_readahead_per_file_mb_fops      },
1050         { .name =       "max_read_ahead_whole_mb",
1051           .fops =       &ll_max_read_ahead_whole_mb_fops        },
1052         { .name =       "max_cached_mb",
1053           .fops =       &ll_max_cached_mb_fops                  },
1054         { .name =       "checksum_pages",
1055           .fops =       &ll_checksum_fops                       },
1056         { .name =       "max_rw_chunk",
1057           .fops =       &ll_max_rw_chunk_fops                   },
1058         { .name =       "stats_track_pid",
1059           .fops =       &ll_track_pid_fops                      },
1060         { .name =       "stats_track_ppid",
1061           .fops =       &ll_track_ppid_fops                     },
1062         { .name =       "stats_track_gid",
1063           .fops =       &ll_track_gid_fops                      },
1064         { .name =       "statahead_max",
1065           .fops =       &ll_statahead_max_fops                  },
1066         { .name =       "statahead_agl",
1067           .fops =       &ll_statahead_agl_fops                  },
1068         { .name =       "statahead_stats",
1069           .fops =       &ll_statahead_stats_fops                },
1070         { .name =       "lazystatfs",
1071           .fops =       &ll_lazystatfs_fops                     },
1072         { .name =       "max_easize",
1073           .fops =       &ll_max_easize_fops                     },
1074         { .name =       "default_easize",
1075           .fops =       &ll_default_easize_fops                 },
1076         { .name =       "max_cookiesize",
1077           .fops =       &ll_max_cookiesize_fops                 },
1078         { .name =       "default_cookiesize",
1079           .fops =       &ll_default_cookiesize_fops             },
1080         { .name =       "sbi_flags",
1081           .fops =       &ll_sbi_flags_fops                      },
1082         { .name =       "xattr_cache",
1083           .fops =       &ll_xattr_cache_fops                    },
1084         { .name =       "unstable_stats",
1085           .fops =       &ll_unstable_stats_fops                 },
1086         { .name =       "root_squash",
1087           .fops =       &ll_root_squash_fops                    },
1088         { .name =       "nosquash_nids",
1089           .fops =       &ll_nosquash_nids_fops                  },
1090         { NULL }
1091 };
1092
1093 #define MAX_STRING_SIZE 128
1094
1095 static const struct llite_file_opcode {
1096         __u32       opcode;
1097         __u32       type;
1098         const char *opname;
1099 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
1100         /* file operation */
1101         { LPROC_LL_DIRTY_HITS,     LPROCFS_TYPE_REGS, "dirty_pages_hits" },
1102         { LPROC_LL_DIRTY_MISSES,   LPROCFS_TYPE_REGS, "dirty_pages_misses" },
1103         { LPROC_LL_READ_BYTES,     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1104                                    "read_bytes" },
1105         { LPROC_LL_WRITE_BYTES,    LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1106                                    "write_bytes" },
1107         { LPROC_LL_BRW_READ,       LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1108                                    "brw_read" },
1109         { LPROC_LL_BRW_WRITE,      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1110                                    "brw_write" },
1111         { LPROC_LL_OSC_READ,       LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1112                                    "osc_read" },
1113         { LPROC_LL_OSC_WRITE,      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1114                                    "osc_write" },
1115         { LPROC_LL_IOCTL,          LPROCFS_TYPE_REGS, "ioctl" },
1116         { LPROC_LL_OPEN,           LPROCFS_TYPE_REGS, "open" },
1117         { LPROC_LL_RELEASE,        LPROCFS_TYPE_REGS, "close" },
1118         { LPROC_LL_MAP,            LPROCFS_TYPE_REGS, "mmap" },
1119         { LPROC_LL_LLSEEK,         LPROCFS_TYPE_REGS, "seek" },
1120         { LPROC_LL_FSYNC,          LPROCFS_TYPE_REGS, "fsync" },
1121         { LPROC_LL_READDIR,        LPROCFS_TYPE_REGS, "readdir" },
1122         /* inode operation */
1123         { LPROC_LL_SETATTR,        LPROCFS_TYPE_REGS, "setattr" },
1124         { LPROC_LL_TRUNC,          LPROCFS_TYPE_REGS, "truncate" },
1125         { LPROC_LL_FLOCK,          LPROCFS_TYPE_REGS, "flock" },
1126         { LPROC_LL_GETATTR,        LPROCFS_TYPE_REGS, "getattr" },
1127         /* dir inode operation */
1128         { LPROC_LL_CREATE,         LPROCFS_TYPE_REGS, "create" },
1129         { LPROC_LL_LINK,           LPROCFS_TYPE_REGS, "link" },
1130         { LPROC_LL_UNLINK,         LPROCFS_TYPE_REGS, "unlink" },
1131         { LPROC_LL_SYMLINK,        LPROCFS_TYPE_REGS, "symlink" },
1132         { LPROC_LL_MKDIR,          LPROCFS_TYPE_REGS, "mkdir" },
1133         { LPROC_LL_RMDIR,          LPROCFS_TYPE_REGS, "rmdir" },
1134         { LPROC_LL_MKNOD,          LPROCFS_TYPE_REGS, "mknod" },
1135         { LPROC_LL_RENAME,         LPROCFS_TYPE_REGS, "rename" },
1136         /* special inode operation */
1137         { LPROC_LL_STAFS,          LPROCFS_TYPE_REGS, "statfs" },
1138         { LPROC_LL_ALLOC_INODE,    LPROCFS_TYPE_REGS, "alloc_inode" },
1139         { LPROC_LL_SETXATTR,       LPROCFS_TYPE_REGS, "setxattr" },
1140         { LPROC_LL_GETXATTR,       LPROCFS_TYPE_REGS, "getxattr" },
1141         { LPROC_LL_GETXATTR_HITS,  LPROCFS_TYPE_REGS, "getxattr_hits" },
1142         { LPROC_LL_LISTXATTR,      LPROCFS_TYPE_REGS, "listxattr" },
1143         { LPROC_LL_REMOVEXATTR,    LPROCFS_TYPE_REGS, "removexattr" },
1144         { LPROC_LL_INODE_PERM,     LPROCFS_TYPE_REGS, "inode_permission" },
1145 };
1146
1147 void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
1148 {
1149         if (!sbi->ll_stats)
1150                 return;
1151         if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
1152                 lprocfs_counter_add(sbi->ll_stats, op, count);
1153         else if (sbi->ll_stats_track_type == STATS_TRACK_PID &&
1154                  sbi->ll_stats_track_id == current->pid)
1155                 lprocfs_counter_add(sbi->ll_stats, op, count);
1156         else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
1157                  sbi->ll_stats_track_id == current->parent->pid)
1158                 lprocfs_counter_add(sbi->ll_stats, op, count);
1159         else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
1160                  sbi->ll_stats_track_id ==
1161                         from_kgid(&init_user_ns, current_gid()))
1162                 lprocfs_counter_add(sbi->ll_stats, op, count);
1163 }
1164 EXPORT_SYMBOL(ll_stats_ops_tally);
1165
1166 static const char *ra_stat_string[] = {
1167         [RA_STAT_HIT] = "hits",
1168         [RA_STAT_MISS] = "misses",
1169         [RA_STAT_DISTANT_READPAGE] = "readpage not consecutive",
1170         [RA_STAT_MISS_IN_WINDOW] = "miss inside window",
1171         [RA_STAT_FAILED_GRAB_PAGE] = "failed grab_cache_page",
1172         [RA_STAT_FAILED_MATCH] = "failed lock match",
1173         [RA_STAT_DISCARDED] = "read but discarded",
1174         [RA_STAT_ZERO_LEN] = "zero length file",
1175         [RA_STAT_ZERO_WINDOW] = "zero size window",
1176         [RA_STAT_EOF] = "read-ahead to EOF",
1177         [RA_STAT_MAX_IN_FLIGHT] = "hit max r-a issue",
1178         [RA_STAT_WRONG_GRAB_PAGE] = "wrong page from grab_cache_page",
1179         [RA_STAT_FAILED_REACH_END] = "failed to reach end"
1180 };
1181
1182 LPROC_SEQ_FOPS_RO_TYPE(llite, name);
1183 LPROC_SEQ_FOPS_RO_TYPE(llite, uuid);
1184
1185 int lprocfs_register_mountpoint(struct proc_dir_entry *parent,
1186                                 struct super_block *sb, char *osc, char *mdc)
1187 {
1188         struct lprocfs_vars lvars[2];
1189         struct lustre_sb_info *lsi = s2lsi(sb);
1190         struct ll_sb_info *sbi = ll_s2sbi(sb);
1191         struct obd_device *obd;
1192         struct proc_dir_entry *dir;
1193         char name[MAX_STRING_SIZE + 1], *ptr;
1194         int err, id, len, rc;
1195         ENTRY;
1196
1197         memset(lvars, 0, sizeof(lvars));
1198
1199         name[MAX_STRING_SIZE] = '\0';
1200         lvars[0].name = name;
1201
1202         LASSERT(sbi != NULL);
1203         LASSERT(mdc != NULL);
1204         LASSERT(osc != NULL);
1205
1206         /* Get fsname */
1207         len = strlen(lsi->lsi_lmd->lmd_profile);
1208         ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
1209         if (ptr && (strcmp(ptr, "-client") == 0))
1210                 len -= 7;
1211
1212         /* Mount info */
1213         snprintf(name, MAX_STRING_SIZE, "%.*s-%p", len,
1214                  lsi->lsi_lmd->lmd_profile, sb);
1215
1216         sbi->ll_proc_root = lprocfs_register(name, parent, NULL, NULL);
1217         if (IS_ERR(sbi->ll_proc_root)) {
1218                 err = PTR_ERR(sbi->ll_proc_root);
1219                 sbi->ll_proc_root = NULL;
1220                 RETURN(err);
1221         }
1222
1223         rc = lprocfs_seq_create(sbi->ll_proc_root, "dump_page_cache", 0444,
1224                                 &vvp_dump_pgcache_file_ops, sbi);
1225         if (rc)
1226                 CWARN("Error adding the dump_page_cache file\n");
1227
1228         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats", 0644,
1229                                 &ll_rw_extents_stats_fops, sbi);
1230         if (rc)
1231                 CWARN("Error adding the extent_stats file\n");
1232
1233         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats_per_process",
1234                                 0644, &ll_rw_extents_stats_pp_fops, sbi);
1235         if (rc)
1236                 CWARN("Error adding the extents_stats_per_process file\n");
1237
1238         rc = lprocfs_seq_create(sbi->ll_proc_root, "offset_stats", 0644,
1239                                 &ll_rw_offset_stats_fops, sbi);
1240         if (rc)
1241                 CWARN("Error adding the offset_stats file\n");
1242
1243         /* File operations stats */
1244         sbi->ll_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES,
1245                                             LPROCFS_STATS_FLAG_NONE);
1246         if (sbi->ll_stats == NULL)
1247                 GOTO(out, err = -ENOMEM);
1248         /* do counter init */
1249         for (id = 0; id < LPROC_LL_FILE_OPCODES; id++) {
1250                 __u32 type = llite_opcode_table[id].type;
1251                 void *ptr = NULL;
1252                 if (type & LPROCFS_TYPE_REGS)
1253                         ptr = "regs";
1254                 else if (type & LPROCFS_TYPE_BYTES)
1255                         ptr = "bytes";
1256                 else if (type & LPROCFS_TYPE_PAGES)
1257                         ptr = "pages";
1258                 lprocfs_counter_init(sbi->ll_stats,
1259                                      llite_opcode_table[id].opcode,
1260                                      (type & LPROCFS_CNTR_AVGMINMAX),
1261                                      llite_opcode_table[id].opname, ptr);
1262         }
1263         err = lprocfs_register_stats(sbi->ll_proc_root, "stats", sbi->ll_stats);
1264         if (err)
1265                 GOTO(out, err);
1266
1267         sbi->ll_ra_stats = lprocfs_alloc_stats(ARRAY_SIZE(ra_stat_string),
1268                                                LPROCFS_STATS_FLAG_NONE);
1269         if (sbi->ll_ra_stats == NULL)
1270                 GOTO(out, err = -ENOMEM);
1271
1272         for (id = 0; id < ARRAY_SIZE(ra_stat_string); id++)
1273                 lprocfs_counter_init(sbi->ll_ra_stats, id, 0,
1274                                      ra_stat_string[id], "pages");
1275         err = lprocfs_register_stats(sbi->ll_proc_root, "read_ahead_stats",
1276                                      sbi->ll_ra_stats);
1277         if (err)
1278                 GOTO(out, err);
1279
1280
1281         err = lprocfs_add_vars(sbi->ll_proc_root, lprocfs_llite_obd_vars, sb);
1282         if (err)
1283                 GOTO(out, err);
1284
1285         /* MDC info */
1286         obd = class_name2obd(mdc);
1287
1288         LASSERT(obd != NULL);
1289         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1290         LASSERT(obd->obd_type->typ_name != NULL);
1291
1292         dir = proc_mkdir(obd->obd_type->typ_name, sbi->ll_proc_root);
1293         if (dir == NULL)
1294                 GOTO(out, err = -ENOMEM);
1295
1296         snprintf(name, MAX_STRING_SIZE, "common_name");
1297         lvars[0].fops = &llite_name_fops;
1298         err = lprocfs_add_vars(dir, lvars, obd);
1299         if (err)
1300                 GOTO(out, err);
1301
1302         snprintf(name, MAX_STRING_SIZE, "uuid");
1303         lvars[0].fops = &llite_uuid_fops;
1304         err = lprocfs_add_vars(dir, lvars, obd);
1305         if (err)
1306                 GOTO(out, err);
1307
1308         /* OSC */
1309         obd = class_name2obd(osc);
1310
1311         LASSERT(obd != NULL);
1312         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1313         LASSERT(obd->obd_type->typ_name != NULL);
1314
1315         dir = proc_mkdir(obd->obd_type->typ_name, sbi->ll_proc_root);
1316         if (dir == NULL)
1317                 GOTO(out, err = -ENOMEM);
1318
1319         snprintf(name, MAX_STRING_SIZE, "common_name");
1320         lvars[0].fops = &llite_name_fops;
1321         err = lprocfs_add_vars(dir, lvars, obd);
1322         if (err)
1323                 GOTO(out, err);
1324
1325         snprintf(name, MAX_STRING_SIZE, "uuid");
1326         lvars[0].fops = &llite_uuid_fops;
1327         err = lprocfs_add_vars(dir, lvars, obd);
1328 out:
1329         if (err) {
1330                 lprocfs_remove(&sbi->ll_proc_root);
1331                 lprocfs_free_stats(&sbi->ll_ra_stats);
1332                 lprocfs_free_stats(&sbi->ll_stats);
1333         }
1334         RETURN(err);
1335 }
1336
1337 void lprocfs_unregister_mountpoint(struct ll_sb_info *sbi)
1338 {
1339         if (sbi->ll_proc_root) {
1340                 lprocfs_remove(&sbi->ll_proc_root);
1341                 lprocfs_free_stats(&sbi->ll_ra_stats);
1342                 lprocfs_free_stats(&sbi->ll_stats);
1343         }
1344 }
1345 #undef MAX_STRING_SIZE
1346
1347 #define pct(a,b) (b ? a * 100 / b : 0)
1348
1349 static void ll_display_extents_info(struct ll_rw_extents_info *io_extents,
1350                                    struct seq_file *seq, int which)
1351 {
1352         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
1353         unsigned long start, end, r, w;
1354         char *unitp = "KMGTPEZY";
1355         int i, units = 10;
1356         struct per_process_info *pp_info = &io_extents->pp_extents[which];
1357
1358         read_cum = 0;
1359         write_cum = 0;
1360         start = 0;
1361
1362         for(i = 0; i < LL_HIST_MAX; i++) {
1363                 read_tot += pp_info->pp_r_hist.oh_buckets[i];
1364                 write_tot += pp_info->pp_w_hist.oh_buckets[i];
1365         }
1366
1367         for(i = 0; i < LL_HIST_MAX; i++) {
1368                 r = pp_info->pp_r_hist.oh_buckets[i];
1369                 w = pp_info->pp_w_hist.oh_buckets[i];
1370                 read_cum += r;
1371                 write_cum += w;
1372                 end = 1 << (i + LL_HIST_START - units);
1373                 seq_printf(seq, "%4lu%c - %4lu%c%c: %14lu %4lu %4lu  | "
1374                            "%14lu %4lu %4lu\n", start, *unitp, end, *unitp,
1375                            (i == LL_HIST_MAX - 1) ? '+' : ' ',
1376                            r, pct(r, read_tot), pct(read_cum, read_tot),
1377                            w, pct(w, write_tot), pct(write_cum, write_tot));
1378                 start = end;
1379                 if (start == 1<<10) {
1380                         start = 1;
1381                         units += 10;
1382                         unitp++;
1383                 }
1384                 if (read_cum == read_tot && write_cum == write_tot)
1385                         break;
1386         }
1387 }
1388
1389 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
1390 {
1391         struct timeval now;
1392         struct ll_sb_info *sbi = seq->private;
1393         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1394         int k;
1395
1396         do_gettimeofday(&now);
1397
1398         if (!sbi->ll_rw_stats_on) {
1399                 seq_printf(seq, "disabled\n"
1400                                 "write anything in this file to activate, "
1401                                 "then 0 or \"[D/d]isabled\" to deactivate\n");
1402                 return 0;
1403         }
1404         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
1405                    now.tv_sec, now.tv_usec);
1406         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1407         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1408                    "extents", "calls", "%", "cum%",
1409                    "calls", "%", "cum%");
1410         spin_lock(&sbi->ll_pp_extent_lock);
1411         for (k = 0; k < LL_PROCESS_HIST_MAX; k++) {
1412                 if (io_extents->pp_extents[k].pid != 0) {
1413                         seq_printf(seq, "\nPID: %d\n",
1414                                    io_extents->pp_extents[k].pid);
1415                         ll_display_extents_info(io_extents, seq, k);
1416                 }
1417         }
1418         spin_unlock(&sbi->ll_pp_extent_lock);
1419         return 0;
1420 }
1421
1422 static ssize_t ll_rw_extents_stats_pp_seq_write(struct file *file,
1423                                                 const char __user *buf,
1424                                                 size_t len,
1425                                                 loff_t *off)
1426 {
1427         struct seq_file *seq = file->private_data;
1428         struct ll_sb_info *sbi = seq->private;
1429         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1430         int i;
1431         int value = 1, rc = 0;
1432
1433         if (len == 0)
1434                 return -EINVAL;
1435
1436         rc = lprocfs_write_helper(buf, len, &value);
1437         if (rc < 0 && len < 16) {
1438                 char kernbuf[16];
1439
1440                 if (copy_from_user(kernbuf, buf, len))
1441                         return -EFAULT;
1442                 kernbuf[len] = 0;
1443
1444                 if (kernbuf[len - 1] == '\n')
1445                         kernbuf[len - 1] = 0;
1446
1447                 if (strcmp(kernbuf, "disabled") == 0 ||
1448                     strcmp(kernbuf, "Disabled") == 0)
1449                         value = 0;
1450         }
1451
1452         if (value == 0)
1453                 sbi->ll_rw_stats_on = 0;
1454         else
1455                 sbi->ll_rw_stats_on = 1;
1456
1457         spin_lock(&sbi->ll_pp_extent_lock);
1458         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1459                 io_extents->pp_extents[i].pid = 0;
1460                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1461                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1462         }
1463         spin_unlock(&sbi->ll_pp_extent_lock);
1464         return len;
1465 }
1466
1467 LPROC_SEQ_FOPS(ll_rw_extents_stats_pp);
1468
1469 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
1470 {
1471         struct timeval now;
1472         struct ll_sb_info *sbi = seq->private;
1473         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1474
1475         do_gettimeofday(&now);
1476
1477         if (!sbi->ll_rw_stats_on) {
1478                 seq_printf(seq, "disabled\n"
1479                                 "write anything in this file to activate, "
1480                                 "then 0 or \"[D/d]isabled\" to deactivate\n");
1481                 return 0;
1482         }
1483         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
1484                    now.tv_sec, now.tv_usec);
1485
1486         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1487         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1488                    "extents", "calls", "%", "cum%",
1489                    "calls", "%", "cum%");
1490         spin_lock(&sbi->ll_lock);
1491         ll_display_extents_info(io_extents, seq, LL_PROCESS_HIST_MAX);
1492         spin_unlock(&sbi->ll_lock);
1493
1494         return 0;
1495 }
1496
1497 static ssize_t ll_rw_extents_stats_seq_write(struct file *file,
1498                                              const char __user *buf,
1499                                              size_t len, loff_t *off)
1500 {
1501         struct seq_file *seq = file->private_data;
1502         struct ll_sb_info *sbi = seq->private;
1503         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1504         int i;
1505         int value = 1, rc = 0;
1506
1507         if (len == 0)
1508                 return -EINVAL;
1509
1510         rc = lprocfs_write_helper(buf, len, &value);
1511         if (rc < 0 && len < 16) {
1512                 char kernbuf[16];
1513
1514                 if (copy_from_user(kernbuf, buf, len))
1515                         return -EFAULT;
1516                 kernbuf[len] = 0;
1517
1518                 if (kernbuf[len - 1] == '\n')
1519                         kernbuf[len - 1] = 0;
1520
1521                 if (strcmp(kernbuf, "disabled") == 0 ||
1522                     strcmp(kernbuf, "Disabled") == 0)
1523                         value = 0;
1524         }
1525
1526         if (value == 0)
1527                 sbi->ll_rw_stats_on = 0;
1528         else
1529                 sbi->ll_rw_stats_on = 1;
1530
1531         spin_lock(&sbi->ll_pp_extent_lock);
1532         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
1533                 io_extents->pp_extents[i].pid = 0;
1534                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1535                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1536         }
1537         spin_unlock(&sbi->ll_pp_extent_lock);
1538
1539         return len;
1540 }
1541 LPROC_SEQ_FOPS(ll_rw_extents_stats);
1542
1543 void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
1544                        struct ll_file_data *file, loff_t pos,
1545                        size_t count, int rw)
1546 {
1547         int i, cur = -1;
1548         struct ll_rw_process_info *process;
1549         struct ll_rw_process_info *offset;
1550         int *off_count = &sbi->ll_rw_offset_entry_count;
1551         int *process_count = &sbi->ll_offset_process_count;
1552         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1553
1554         if(!sbi->ll_rw_stats_on)
1555                 return;
1556         process = sbi->ll_rw_process_info;
1557         offset = sbi->ll_rw_offset_info;
1558
1559         spin_lock(&sbi->ll_pp_extent_lock);
1560         /* Extent statistics */
1561         for(i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1562                 if(io_extents->pp_extents[i].pid == pid) {
1563                         cur = i;
1564                         break;
1565                 }
1566         }
1567
1568         if (cur == -1) {
1569                 /* new process */
1570                 sbi->ll_extent_process_count =
1571                         (sbi->ll_extent_process_count + 1) % LL_PROCESS_HIST_MAX;
1572                 cur = sbi->ll_extent_process_count;
1573                 io_extents->pp_extents[cur].pid = pid;
1574                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_r_hist);
1575                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_w_hist);
1576         }
1577
1578         for(i = 0; (count >= (1 << LL_HIST_START << i)) &&
1579              (i < (LL_HIST_MAX - 1)); i++);
1580         if (rw == 0) {
1581                 io_extents->pp_extents[cur].pp_r_hist.oh_buckets[i]++;
1582                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_r_hist.oh_buckets[i]++;
1583         } else {
1584                 io_extents->pp_extents[cur].pp_w_hist.oh_buckets[i]++;
1585                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_w_hist.oh_buckets[i]++;
1586         }
1587         spin_unlock(&sbi->ll_pp_extent_lock);
1588
1589         spin_lock(&sbi->ll_process_lock);
1590         /* Offset statistics */
1591         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1592                 if (process[i].rw_pid == pid) {
1593                         if (process[i].rw_last_file != file) {
1594                                 process[i].rw_range_start = pos;
1595                                 process[i].rw_last_file_pos = pos + count;
1596                                 process[i].rw_smallest_extent = count;
1597                                 process[i].rw_largest_extent = count;
1598                                 process[i].rw_offset = 0;
1599                                 process[i].rw_last_file = file;
1600                                 spin_unlock(&sbi->ll_process_lock);
1601                                 return;
1602                         }
1603                         if (process[i].rw_last_file_pos != pos) {
1604                                 *off_count =
1605                                     (*off_count + 1) % LL_OFFSET_HIST_MAX;
1606                                 offset[*off_count].rw_op = process[i].rw_op;
1607                                 offset[*off_count].rw_pid = pid;
1608                                 offset[*off_count].rw_range_start =
1609                                         process[i].rw_range_start;
1610                                 offset[*off_count].rw_range_end =
1611                                         process[i].rw_last_file_pos;
1612                                 offset[*off_count].rw_smallest_extent =
1613                                         process[i].rw_smallest_extent;
1614                                 offset[*off_count].rw_largest_extent =
1615                                         process[i].rw_largest_extent;
1616                                 offset[*off_count].rw_offset =
1617                                         process[i].rw_offset;
1618                                 process[i].rw_op = rw;
1619                                 process[i].rw_range_start = pos;
1620                                 process[i].rw_smallest_extent = count;
1621                                 process[i].rw_largest_extent = count;
1622                                 process[i].rw_offset = pos -
1623                                         process[i].rw_last_file_pos;
1624                         }
1625                         if(process[i].rw_smallest_extent > count)
1626                                 process[i].rw_smallest_extent = count;
1627                         if(process[i].rw_largest_extent < count)
1628                                 process[i].rw_largest_extent = count;
1629                         process[i].rw_last_file_pos = pos + count;
1630                         spin_unlock(&sbi->ll_process_lock);
1631                         return;
1632                 }
1633         }
1634         *process_count = (*process_count + 1) % LL_PROCESS_HIST_MAX;
1635         process[*process_count].rw_pid = pid;
1636         process[*process_count].rw_op = rw;
1637         process[*process_count].rw_range_start = pos;
1638         process[*process_count].rw_last_file_pos = pos + count;
1639         process[*process_count].rw_smallest_extent = count;
1640         process[*process_count].rw_largest_extent = count;
1641         process[*process_count].rw_offset = 0;
1642         process[*process_count].rw_last_file = file;
1643         spin_unlock(&sbi->ll_process_lock);
1644 }
1645
1646 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
1647 {
1648         struct timeval now;
1649         struct ll_sb_info *sbi = seq->private;
1650         struct ll_rw_process_info *offset = sbi->ll_rw_offset_info;
1651         struct ll_rw_process_info *process = sbi->ll_rw_process_info;
1652         int i;
1653
1654         do_gettimeofday(&now);
1655
1656         if (!sbi->ll_rw_stats_on) {
1657                 seq_printf(seq, "disabled\n"
1658                                 "write anything in this file to activate, "
1659                                 "then 0 or \"[D/d]isabled\" to deactivate\n");
1660                 return 0;
1661         }
1662         spin_lock(&sbi->ll_process_lock);
1663
1664         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
1665                    now.tv_sec, now.tv_usec);
1666         seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
1667                    "R/W", "PID", "RANGE START", "RANGE END",
1668                    "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");
1669
1670         /* We stored the discontiguous offsets here; print them first */
1671         for (i = 0; i < LL_OFFSET_HIST_MAX; i++) {
1672                 if (offset[i].rw_pid != 0)
1673                         seq_printf(seq,
1674                                    "%3c %10d %14Lu %14Lu %17lu %17lu %14Lu",
1675                                    offset[i].rw_op == READ ? 'R' : 'W',
1676                                    offset[i].rw_pid,
1677                                    offset[i].rw_range_start,
1678                                    offset[i].rw_range_end,
1679                                    (unsigned long)offset[i].rw_smallest_extent,
1680                                    (unsigned long)offset[i].rw_largest_extent,
1681                                    offset[i].rw_offset);
1682         }
1683
1684         /* Then print the current offsets for each process */
1685         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1686                 if (process[i].rw_pid != 0)
1687                         seq_printf(seq,
1688                                    "%3c %10d %14Lu %14Lu %17lu %17lu %14Lu",
1689                                    process[i].rw_op == READ ? 'R' : 'W',
1690                                    process[i].rw_pid,
1691                                    process[i].rw_range_start,
1692                                    process[i].rw_last_file_pos,
1693                                    (unsigned long)process[i].rw_smallest_extent,
1694                                    (unsigned long)process[i].rw_largest_extent,
1695                                    process[i].rw_offset);
1696         }
1697         spin_unlock(&sbi->ll_process_lock);
1698
1699         return 0;
1700 }
1701
1702 static ssize_t ll_rw_offset_stats_seq_write(struct file *file,
1703                                             const char __user *buf,
1704                                             size_t len, loff_t *off)
1705 {
1706         struct seq_file *seq = file->private_data;
1707         struct ll_sb_info *sbi = seq->private;
1708         struct ll_rw_process_info *process_info = sbi->ll_rw_process_info;
1709         struct ll_rw_process_info *offset_info = sbi->ll_rw_offset_info;
1710         int value = 1, rc = 0;
1711
1712         if (len == 0)
1713                 return -EINVAL;
1714
1715         rc = lprocfs_write_helper(buf, len, &value);
1716
1717         if (rc < 0 && len < 16) {
1718                 char kernbuf[16];
1719
1720                 if (copy_from_user(kernbuf, buf, len))
1721                         return -EFAULT;
1722                 kernbuf[len] = 0;
1723
1724                 if (kernbuf[len - 1] == '\n')
1725                         kernbuf[len - 1] = 0;
1726
1727                 if (strcmp(kernbuf, "disabled") == 0 ||
1728                     strcmp(kernbuf, "Disabled") == 0)
1729                         value = 0;
1730         }
1731
1732         if (value == 0)
1733                 sbi->ll_rw_stats_on = 0;
1734         else
1735                 sbi->ll_rw_stats_on = 1;
1736
1737         spin_lock(&sbi->ll_process_lock);
1738         sbi->ll_offset_process_count = 0;
1739         sbi->ll_rw_offset_entry_count = 0;
1740         memset(process_info, 0, sizeof(struct ll_rw_process_info) *
1741                LL_PROCESS_HIST_MAX);
1742         memset(offset_info, 0, sizeof(struct ll_rw_process_info) *
1743                LL_OFFSET_HIST_MAX);
1744         spin_unlock(&sbi->ll_process_lock);
1745
1746         return len;
1747 }
1748
1749 LPROC_SEQ_FOPS(ll_rw_offset_stats);
1750 #endif /* CONFIG_PROC_FS */