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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  */
  31 #define DEBUG_SUBSYSTEM S_LLITE
  32
  33 #include <linux/version.h>
  34 #include <linux/user_namespace.h>
  35 #include <linux/uidgid.h>
  36
  37 #include <uapi/linux/lustre/lustre_param.h>
  38 #include <lprocfs_status.h>
  39 #include <obd_support.h>
  40
  41 #include "llite_internal.h"
  42 #include "vvp_internal.h"
  43
  44 static struct kobject *llite_kobj;
  45 static struct dentry *llite_root;
  46
  47 static void llite_kobj_release(struct kobject *kobj)
  48 {
  49         if (!IS_ERR_OR_NULL(llite_root)) {
  50                 debugfs_remove(llite_root);
  51                 llite_root = NULL;
  52         }
  53
  54         kfree(kobj);
  55 }
  56
  57 static struct kobj_type llite_kobj_ktype = {
  58         .release        = llite_kobj_release,
  59         .sysfs_ops      = &lustre_sysfs_ops,
  60 };
  61
  62 int llite_tunables_register(void)
  63 {
  64         int rc;
  65
  66         llite_kobj = kzalloc(sizeof(*llite_kobj), GFP_KERNEL);
  67         if (!llite_kobj)
  68                 return -ENOMEM;
  69
  70         llite_kobj->kset = lustre_kset;
  71         rc = kobject_init_and_add(llite_kobj, &llite_kobj_ktype,
  72                                   &lustre_kset->kobj, "%s", "llite");
  73         if (rc)
  74                 goto free_kobj;
  75
  76         llite_root = debugfs_create_dir("llite", debugfs_lustre_root);
  77         return 0;
  78
  79 free_kobj:
  80         kobject_put(llite_kobj);
  81         llite_kobj = NULL;
  82
  83         return rc;
  84 }
  85
  86 void llite_tunables_unregister(void)
  87 {
  88         kobject_put(llite_kobj);
  89         llite_kobj = NULL;
  90 }
  91
  92 /* <debugfs>/lustre/llite mount point registration */
  93 static const struct file_operations ll_rw_extents_stats_fops;
  94 static const struct file_operations ll_rw_extents_stats_pp_fops;
  95 static const struct file_operations ll_rw_offset_stats_fops;
  96
  97 /**
  98  * ll_stats_pid_write() - Determine if stats collection should be enabled
  99  * @buf: Buffer containing the data written
 100  * @len: Number of bytes in the buffer
 101  *
 102  * Several proc files begin collecting stats when a value is written, and stop
 103  * collecting when either '0' or 'disable' is written. This function checks the
 104  * written value to see if collection should be enabled or disabled.
 105  *
 106  * Return: If '0' or 'disable' is provided, 0 is returned. If the text
 107  * equivalent of a number is written, that number is returned. Otherwise,
 108  * 1 is returned. Non-zero return values indicate collection should be enabled.
 109  */
 110 static s64 ll_stats_pid_write(const char __user *buf, size_t len)
 111 {
 112         unsigned long long value = 1;
 113         char kernbuf[16];
 114         int rc;
 115
 116         rc = kstrtoull_from_user(buf, len, 0, &value);
 117         if (rc < 0 && len < sizeof(kernbuf)) {
 118                 if (copy_from_user(kernbuf, buf, len))
 119                         return -EFAULT;
 120                 kernbuf[len] = 0;
 121
 122                 if (kernbuf[len - 1] == '\n')
 123                         kernbuf[len - 1] = 0;
 124
 125                 if (strncasecmp(kernbuf, "disable", 7) == 0)
 126                         value = 0;
 127         }
 128
 129         return value;
 130 }
 131
 132 static ssize_t blocksize_show(struct kobject *kobj, struct attribute *attr,
 133                               char *buf)
 134 {
 135         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 136                                               ll_kset.kobj);
 137         struct obd_statfs osfs;
 138         int rc;
 139
 140         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 141         if (rc)
 142                 return rc;
 143
 144         return sprintf(buf, "%u\n", osfs.os_bsize);
 145 }
 146 LUSTRE_RO_ATTR(blocksize);
 147
 148 static ssize_t stat_blocksize_show(struct kobject *kobj, struct attribute *attr,
 149                                    char *buf)
 150 {
 151         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 152                                               ll_kset.kobj);
 153
 154         return sprintf(buf, "%u\n", sbi->ll_stat_blksize);
 155 }
 156
 157 static ssize_t stat_blocksize_store(struct kobject *kobj,
 158                                     struct attribute *attr,
 159                                     const char *buffer,
 160                                     size_t count)
 161 {
 162         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 163                                               ll_kset.kobj);
 164         unsigned int val;
 165         int rc;
 166
 167         rc = kstrtouint(buffer, 10, &val);
 168         if (rc)
 169                 return rc;
 170
 171         if (val != 0 && (val < PAGE_SIZE || (val & (val - 1))) != 0)
 172                 return -ERANGE;
 173
 174         sbi->ll_stat_blksize = val;
 175
 176         return count;
 177 }
 178 LUSTRE_RW_ATTR(stat_blocksize);
 179
 180 static ssize_t kbytestotal_show(struct kobject *kobj, struct attribute *attr,
 181                                 char *buf)
 182 {
 183         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 184                                               ll_kset.kobj);
 185         struct obd_statfs osfs;
 186         u32 blk_size;
 187         u64 result;
 188         int rc;
 189
 190         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 191         if (rc)
 192                 return rc;
 193
 194         blk_size = osfs.os_bsize >> 10;
 195         result = osfs.os_blocks;
 196
 197         while (blk_size >>= 1)
 198                 result <<= 1;
 199
 200         return sprintf(buf, "%llu\n", result);
 201 }
 202 LUSTRE_RO_ATTR(kbytestotal);
 203
 204 static ssize_t kbytesfree_show(struct kobject *kobj, struct attribute *attr,
 205                                char *buf)
 206 {
 207         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 208                                               ll_kset.kobj);
 209         struct obd_statfs osfs;
 210         u32 blk_size;
 211         u64 result;
 212         int rc;
 213
 214         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 215         if (rc)
 216                 return rc;
 217
 218         blk_size = osfs.os_bsize >> 10;
 219         result = osfs.os_bfree;
 220
 221         while (blk_size >>= 1)
 222                 result <<= 1;
 223
 224         return sprintf(buf, "%llu\n", result);
 225 }
 226 LUSTRE_RO_ATTR(kbytesfree);
 227
 228 static ssize_t kbytesavail_show(struct kobject *kobj, struct attribute *attr,
 229                                 char *buf)
 230 {
 231         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 232                                               ll_kset.kobj);
 233         struct obd_statfs osfs;
 234         u32 blk_size;
 235         u64 result;
 236         int rc;
 237
 238         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 239         if (rc)
 240                 return rc;
 241
 242         blk_size = osfs.os_bsize >> 10;
 243         result = osfs.os_bavail;
 244
 245         while (blk_size >>= 1)
 246                 result <<= 1;
 247
 248         return sprintf(buf, "%llu\n", result);
 249 }
 250 LUSTRE_RO_ATTR(kbytesavail);
 251
 252 static ssize_t filestotal_show(struct kobject *kobj, struct attribute *attr,
 253                                char *buf)
 254 {
 255         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 256                                               ll_kset.kobj);
 257         struct obd_statfs osfs;
 258         int rc;
 259
 260         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 261         if (rc)
 262                 return rc;
 263
 264         return sprintf(buf, "%llu\n", osfs.os_files);
 265 }
 266 LUSTRE_RO_ATTR(filestotal);
 267
 268 static ssize_t filesfree_show(struct kobject *kobj, struct attribute *attr,
 269                               char *buf)
 270 {
 271         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 272                                               ll_kset.kobj);
 273         struct obd_statfs osfs;
 274         int rc;
 275
 276         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 277         if (rc)
 278                 return rc;
 279
 280         return sprintf(buf, "%llu\n", osfs.os_ffree);
 281 }
 282 LUSTRE_RO_ATTR(filesfree);
 283
 284 static ssize_t client_type_show(struct kobject *kobj, struct attribute *attr,
 285                                 char *buf)
 286 {
 287         return sprintf(buf, "local client\n");
 288 }
 289 LUSTRE_RO_ATTR(client_type);
 290
 291 LUSTRE_RW_ATTR(foreign_symlink_enable);
 292
 293 LUSTRE_RW_ATTR(foreign_symlink_prefix);
 294
 295 LUSTRE_RW_ATTR(foreign_symlink_upcall);
 296
 297 LUSTRE_WO_ATTR(foreign_symlink_upcall_info);
 298
 299 static ssize_t fstype_show(struct kobject *kobj, struct attribute *attr,
 300                            char *buf)
 301 {
 302         return sprintf(buf, "lustre\n");
 303 }
 304 LUSTRE_RO_ATTR(fstype);
 305
 306 static ssize_t uuid_show(struct kobject *kobj, struct attribute *attr,
 307                          char *buf)
 308 {
 309         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 310                                               ll_kset.kobj);
 311
 312         return sprintf(buf, "%s\n", sbi->ll_sb_uuid.uuid);
 313 }
 314 LUSTRE_RO_ATTR(uuid);
 315
 316 static int ll_site_stats_seq_show(struct seq_file *m, void *v)
 317 {
 318         struct super_block *sb = m->private;
 319
 320         /*
 321          * See description of statistical counters in struct cl_site, and
 322          * struct lu_site.
 323          */
 324         return cl_site_stats_print(lu2cl_site(ll_s2sbi(sb)->ll_site), m);
 325 }
 326
 327 LDEBUGFS_SEQ_FOPS_RO(ll_site_stats);
 328
 329 static ssize_t max_read_ahead_mb_show(struct kobject *kobj,
 330                                       struct attribute *attr, char *buf)
 331 {
 332         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 333                                               ll_kset.kobj);
 334
 335         return scnprintf(buf, PAGE_SIZE, "%lu\n",
 336                         PAGES_TO_MiB(sbi->ll_ra_info.ra_max_pages));
 337 }
 338
 339 static ssize_t max_read_ahead_mb_store(struct kobject *kobj,
 340                                        struct attribute *attr,
 341                                        const char *buffer, size_t count)
 342 {
 343         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 344                                               ll_kset.kobj);
 345         u64 ra_max_mb, pages_number;
 346         int rc;
 347
 348         rc = sysfs_memparse(buffer, count, &ra_max_mb, "MiB");
 349         if (rc)
 350                 return rc;
 351
 352         pages_number = round_up(ra_max_mb, 1024 * 1024) >> PAGE_SHIFT;
 353         CDEBUG(D_INFO, "%s: set max_read_ahead_mb=%llu (%llu pages)\n",
 354                sbi->ll_fsname, PAGES_TO_MiB(pages_number), pages_number);
 355         if (pages_number > cfs_totalram_pages() / 2) {
 356                 /* 1/2 of RAM */
 357                 CERROR("%s: cannot set max_read_ahead_mb=%llu > totalram/2=%luMB\n",
 358                        sbi->ll_fsname, PAGES_TO_MiB(pages_number),
 359                        PAGES_TO_MiB(cfs_totalram_pages() / 2));
 360                 return -ERANGE;
 361         }
 362
 363         spin_lock(&sbi->ll_lock);
 364         sbi->ll_ra_info.ra_max_pages = pages_number;
 365         spin_unlock(&sbi->ll_lock);
 366
 367         return count;
 368 }
 369 LUSTRE_RW_ATTR(max_read_ahead_mb);
 370
 371 static ssize_t max_read_ahead_per_file_mb_show(struct kobject *kobj,
 372                                                struct attribute *attr,
 373                                                char *buf)
 374 {
 375         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 376                                               ll_kset.kobj);
 377
 378         return scnprintf(buf, PAGE_SIZE, "%lu\n",
 379                          PAGES_TO_MiB(sbi->ll_ra_info.ra_max_pages_per_file));
 380 }
 381
 382 static ssize_t max_read_ahead_per_file_mb_store(struct kobject *kobj,
 383                                                 struct attribute *attr,
 384                                                 const char *buffer,
 385                                                 size_t count)
 386 {
 387         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 388                                               ll_kset.kobj);
 389         u64 ra_max_file_mb, pages_number;
 390         int rc;
 391
 392         rc = sysfs_memparse(buffer, count, &ra_max_file_mb, "MiB");
 393         if (rc)
 394                 return rc;
 395
 396         pages_number = round_up(ra_max_file_mb, 1024 * 1024) >> PAGE_SHIFT;
 397         if (pages_number > sbi->ll_ra_info.ra_max_pages) {
 398                 CERROR("%s: cannot set max_read_ahead_per_file_mb=%llu > max_read_ahead_mb=%lu\n",
 399                        sbi->ll_fsname, PAGES_TO_MiB(pages_number),
 400                        PAGES_TO_MiB(sbi->ll_ra_info.ra_max_pages));
 401                 return -ERANGE;
 402         }
 403
 404         spin_lock(&sbi->ll_lock);
 405         sbi->ll_ra_info.ra_max_pages_per_file = pages_number;
 406         spin_unlock(&sbi->ll_lock);
 407
 408         return count;
 409 }
 410 LUSTRE_RW_ATTR(max_read_ahead_per_file_mb);
 411
 412 static ssize_t max_read_ahead_whole_mb_show(struct kobject *kobj,
 413                                             struct attribute *attr, char *buf)
 414 {
 415         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 416                                               ll_kset.kobj);
 417
 418         return scnprintf(buf, PAGE_SIZE, "%lu\n",
 419                          PAGES_TO_MiB(sbi->ll_ra_info.ra_max_read_ahead_whole_pages));
 420 }
 421
 422 static ssize_t max_read_ahead_whole_mb_store(struct kobject *kobj,
 423                                              struct attribute *attr,
 424                                              const char *buffer, size_t count)
 425 {
 426         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 427                                               ll_kset.kobj);
 428         u64 ra_max_whole_mb, pages_number;
 429         int rc;
 430
 431         rc = sysfs_memparse(buffer, count, &ra_max_whole_mb, "MiB");
 432         if (rc)
 433                 return rc;
 434
 435         pages_number = round_up(ra_max_whole_mb, 1024 * 1024) >> PAGE_SHIFT;
 436         /* Cap this at the current max readahead window size, the readahead
 437          * algorithm does this anyway so it's pointless to set it larger.
 438          */
 439         if (pages_number > sbi->ll_ra_info.ra_max_pages_per_file) {
 440                 CERROR("%s: cannot set max_read_ahead_whole_mb=%llu > max_read_ahead_per_file_mb=%lu\n",
 441                        sbi->ll_fsname, PAGES_TO_MiB(pages_number),
 442                        PAGES_TO_MiB(sbi->ll_ra_info.ra_max_pages_per_file));
 443
 444                 return -ERANGE;
 445         }
 446
 447         spin_lock(&sbi->ll_lock);
 448         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = pages_number;
 449         spin_unlock(&sbi->ll_lock);
 450
 451         return count;
 452 }
 453 LUSTRE_RW_ATTR(max_read_ahead_whole_mb);
 454
 455 static int ll_max_cached_mb_seq_show(struct seq_file *m, void *v)
 456 {
 457         struct super_block     *sb    = m->private;
 458         struct ll_sb_info      *sbi   = ll_s2sbi(sb);
 459         struct cl_client_cache *cache = sbi->ll_cache;
 460         struct ll_ra_info *ra = &sbi->ll_ra_info;
 461         long max_cached_mb;
 462         long unused_mb;
 463
 464         mutex_lock(&cache->ccc_max_cache_mb_lock);
 465         max_cached_mb = PAGES_TO_MiB(cache->ccc_lru_max);
 466         unused_mb = PAGES_TO_MiB(atomic_long_read(&cache->ccc_lru_left));
 467         mutex_unlock(&cache->ccc_max_cache_mb_lock);
 468
 469         seq_printf(m, "users: %d\n"
 470                       "max_cached_mb: %ld\n"
 471                       "used_mb: %ld\n"
 472                       "unused_mb: %ld\n"
 473                       "reclaim_count: %u\n"
 474                       "max_read_ahead_mb: %lu\n"
 475                       "used_read_ahead_mb: %d\n",
 476                    atomic_read(&cache->ccc_users),
 477                    max_cached_mb,
 478                    max_cached_mb - unused_mb,
 479                    unused_mb,
 480                    cache->ccc_lru_shrinkers,
 481                    PAGES_TO_MiB(ra->ra_max_pages),
 482                    PAGES_TO_MiB(atomic_read(&ra->ra_cur_pages)));
 483         return 0;
 484 }
 485
 486 static ssize_t ll_max_cached_mb_seq_write(struct file *file,
 487                                           const char __user *buffer,
 488                                           size_t count, loff_t *off)
 489 {
 490         struct seq_file *m = file->private_data;
 491         struct super_block *sb = m->private;
 492         struct ll_sb_info *sbi = ll_s2sbi(sb);
 493         struct cl_client_cache *cache = sbi->ll_cache;
 494         struct lu_env *env;
 495         long diff = 0;
 496         long nrpages = 0;
 497         __u16 refcheck;
 498         u64 pages_number;
 499         int rc;
 500         char kernbuf[128], *ptr;
 501
 502         ENTRY;
 503         if (count >= sizeof(kernbuf))
 504                 RETURN(-EINVAL);
 505
 506         if (copy_from_user(kernbuf, buffer, count))
 507                 RETURN(-EFAULT);
 508         kernbuf[count] = '\0';
 509
 510         ptr = lprocfs_find_named_value(kernbuf, "max_cached_mb:", &count);
 511         rc = sysfs_memparse(ptr, count, &pages_number, "MiB");
 512         if (rc)
 513                 RETURN(rc);
 514
 515         pages_number >>= PAGE_SHIFT;
 516
 517         if (pages_number < 0 || pages_number > cfs_totalram_pages()) {
 518                 CERROR("%s: can't set max cache more than %lu MB\n",
 519                        sbi->ll_fsname,
 520                        PAGES_TO_MiB(cfs_totalram_pages()));
 521                 RETURN(-ERANGE);
 522         }
 523         /* Allow enough cache so clients can make well-formed RPCs */
 524         pages_number = max_t(long, pages_number, PTLRPC_MAX_BRW_PAGES);
 525
 526         mutex_lock(&cache->ccc_max_cache_mb_lock);
 527         diff = pages_number - cache->ccc_lru_max;
 528
 529         /* easy - add more LRU slots. */
 530         if (diff >= 0) {
 531                 atomic_long_add(diff, &cache->ccc_lru_left);
 532                 GOTO(out, rc = 0);
 533         }
 534
 535         env = cl_env_get(&refcheck);
 536         if (IS_ERR(env))
 537                 GOTO(out_unlock, rc = PTR_ERR(env));
 538
 539         diff = -diff;
 540         while (diff > 0) {
 541                 long tmp;
 542
 543                 /* reduce LRU budget from free slots. */
 544                 do {
 545                         long lru_left_old, lru_left_new, lru_left_ret;
 546
 547                         lru_left_old = atomic_long_read(&cache->ccc_lru_left);
 548                         if (lru_left_old == 0)
 549                                 break;
 550
 551                         lru_left_new = lru_left_old > diff ?
 552                                         lru_left_old - diff : 0;
 553                         lru_left_ret =
 554                                 atomic_long_cmpxchg(&cache->ccc_lru_left,
 555                                                     lru_left_old,
 556                                                     lru_left_new);
 557                         if (likely(lru_left_old == lru_left_ret)) {
 558                                 diff -= lru_left_old - lru_left_new;
 559                                 nrpages += lru_left_old - lru_left_new;
 560                                 break;
 561                         }
 562                 } while (1);
 563
 564                 if (diff <= 0)
 565                         break;
 566
 567                 if (sbi->ll_dt_exp == NULL) { /* being initialized */
 568                         rc = -ENODEV;
 569                         break;
 570                 }
 571
 572                 /* Request extra free slots to avoid them all being used
 573                  * by other processes before this can continue shrinking.
 574                  */
 575                 tmp = diff + min_t(long, diff, MiB_TO_PAGES(1024));
 576                 /* difficult - have to ask OSCs to drop LRU slots. */
 577                 rc = obd_set_info_async(env, sbi->ll_dt_exp,
 578                                 sizeof(KEY_CACHE_LRU_SHRINK),
 579                                 KEY_CACHE_LRU_SHRINK,
 580                                 sizeof(tmp), &tmp, NULL);
 581                 if (rc < 0)
 582                         break;
 583         }
 584         cl_env_put(env, &refcheck);
 585
 586 out:
 587         if (rc >= 0) {
 588                 cache->ccc_lru_max = pages_number;
 589                 rc = count;
 590         } else {
 591                 atomic_long_add(nrpages, &cache->ccc_lru_left);
 592         }
 593 out_unlock:
 594         mutex_unlock(&cache->ccc_max_cache_mb_lock);
 595         return rc;
 596 }
 597 LDEBUGFS_SEQ_FOPS(ll_max_cached_mb);
 598
 599 static ssize_t checksums_show(struct kobject *kobj, struct attribute *attr,
 600                               char *buf)
 601 {
 602         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 603                                               ll_kset.kobj);
 604
 605         return scnprintf(buf, PAGE_SIZE, "%u\n",
 606                          test_bit(LL_SBI_CHECKSUM, sbi->ll_flags));
 607 }
 608
 609 static ssize_t checksums_store(struct kobject *kobj, struct attribute *attr,
 610                                const char *buffer, size_t count)
 611 {
 612         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 613                                               ll_kset.kobj);
 614         bool val;
 615         int tmp;
 616         int rc;
 617
 618         if (!sbi->ll_dt_exp)
 619                 /* Not set up yet */
 620                 return -EAGAIN;
 621
 622         rc = kstrtobool(buffer, &val);
 623         if (rc)
 624                 return rc;
 625         if (val)
 626                 set_bit(LL_SBI_CHECKSUM, sbi->ll_flags);
 627         else
 628                 clear_bit(LL_SBI_CHECKSUM, sbi->ll_flags);
 629         tmp = val;
 630
 631         rc = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 632                                 KEY_CHECKSUM, sizeof(tmp), &tmp, NULL);
 633         if (rc)
 634                 CWARN("Failed to set OSC checksum flags: %d\n", rc);
 635
 636         return count;
 637 }
 638 LUSTRE_RW_ATTR(checksums);
 639
 640 LUSTRE_ATTR(checksum_pages, 0644, checksums_show, checksums_store);
 641
 642 static ssize_t ll_rd_track_id(struct kobject *kobj, char *buf,
 643                               enum stats_track_type type)
 644 {
 645         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 646                                               ll_kset.kobj);
 647
 648         if (sbi->ll_stats_track_type == type)
 649                 return sprintf(buf, "%d\n", sbi->ll_stats_track_id);
 650         else if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
 651                 return sprintf(buf, "0 (all)\n");
 652
 653         return sprintf(buf, "untracked\n");
 654 }
 655
 656 static ssize_t ll_wr_track_id(struct kobject *kobj, const char *buffer,
 657                               size_t count, enum stats_track_type type)
 658 {
 659         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 660                                               ll_kset.kobj);
 661         unsigned long pid;
 662         int rc;
 663
 664         rc = kstrtoul(buffer, 10, &pid);
 665         if (rc)
 666                 return rc;
 667
 668         sbi->ll_stats_track_id = pid;
 669         if (pid == 0)
 670                 sbi->ll_stats_track_type = STATS_TRACK_ALL;
 671         else
 672                 sbi->ll_stats_track_type = type;
 673         lprocfs_clear_stats(sbi->ll_stats);
 674         return count;
 675 }
 676
 677 static ssize_t stats_track_pid_show(struct kobject *kobj,
 678                                     struct attribute *attr,
 679                                     char *buf)
 680 {
 681         return ll_rd_track_id(kobj, buf, STATS_TRACK_PID);
 682 }
 683
 684 static ssize_t stats_track_pid_store(struct kobject *kobj,
 685                                      struct attribute *attr,
 686                                      const char *buffer,
 687                                      size_t count)
 688 {
 689         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_PID);
 690 }
 691 LUSTRE_RW_ATTR(stats_track_pid);
 692
 693 static ssize_t stats_track_ppid_show(struct kobject *kobj,
 694                                      struct attribute *attr,
 695                                      char *buf)
 696 {
 697         return ll_rd_track_id(kobj, buf, STATS_TRACK_PPID);
 698 }
 699
 700 static ssize_t stats_track_ppid_store(struct kobject *kobj,
 701                                       struct attribute *attr,
 702                                       const char *buffer,
 703                                       size_t count)
 704 {
 705         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_PPID);
 706 }
 707 LUSTRE_RW_ATTR(stats_track_ppid);
 708
 709 static ssize_t stats_track_gid_show(struct kobject *kobj,
 710                                     struct attribute *attr,
 711                                     char *buf)
 712 {
 713         return ll_rd_track_id(kobj, buf, STATS_TRACK_GID);
 714 }
 715
 716 static ssize_t stats_track_gid_store(struct kobject *kobj,
 717                                      struct attribute *attr,
 718                                      const char *buffer,
 719                                      size_t count)
 720 {
 721         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_GID);
 722 }
 723 LUSTRE_RW_ATTR(stats_track_gid);
 724
 725 static ssize_t statahead_running_max_show(struct kobject *kobj,
 726                                           struct attribute *attr,
 727                                           char *buf)
 728 {
 729         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 730                                               ll_kset.kobj);
 731
 732         return scnprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_sa_running_max);
 733 }
 734
 735 static ssize_t statahead_running_max_store(struct kobject *kobj,
 736                                            struct attribute *attr,
 737                                            const char *buffer,
 738                                            size_t count)
 739 {
 740         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 741                                               ll_kset.kobj);
 742         unsigned long val;
 743         int rc;
 744
 745         rc = kstrtoul(buffer, 0, &val);
 746         if (rc)
 747                 return rc;
 748
 749         if (val <= LL_SA_RUNNING_MAX) {
 750                 sbi->ll_sa_running_max = val;
 751                 return count;
 752         }
 753
 754         CERROR("Bad statahead_running_max value %lu. Valid values "
 755                "are in the range [0, %d]\n", val, LL_SA_RUNNING_MAX);
 756
 757         return -ERANGE;
 758 }
 759 LUSTRE_RW_ATTR(statahead_running_max);
 760
 761 static ssize_t statahead_max_show(struct kobject *kobj,
 762                                   struct attribute *attr,
 763                                   char *buf)
 764 {
 765         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 766                                               ll_kset.kobj);
 767
 768         return sprintf(buf, "%u\n", sbi->ll_sa_max);
 769 }
 770
 771 static ssize_t statahead_max_store(struct kobject *kobj,
 772                                    struct attribute *attr,
 773                                    const char *buffer,
 774                                    size_t count)
 775 {
 776         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 777                                               ll_kset.kobj);
 778         unsigned long val;
 779         int rc;
 780
 781         rc = kstrtoul(buffer, 0, &val);
 782         if (rc)
 783                 return rc;
 784
 785         if (val <= LL_SA_RPC_MAX)
 786                 sbi->ll_sa_max = val;
 787         else
 788                 CERROR("Bad statahead_max value %lu. Valid values are in the range [0, %d]\n",
 789                        val, LL_SA_RPC_MAX);
 790
 791         return count;
 792 }
 793 LUSTRE_RW_ATTR(statahead_max);
 794
 795 static ssize_t statahead_agl_show(struct kobject *kobj,
 796                                   struct attribute *attr,
 797                                   char *buf)
 798 {
 799         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 800                                               ll_kset.kobj);
 801
 802         return scnprintf(buf, PAGE_SIZE, "%u\n",
 803                          test_bit(LL_SBI_AGL_ENABLED, sbi->ll_flags));
 804 }
 805
 806 static ssize_t statahead_agl_store(struct kobject *kobj,
 807                                    struct attribute *attr,
 808                                    const char *buffer,
 809                                    size_t count)
 810 {
 811         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 812                                               ll_kset.kobj);
 813         bool val;
 814         int rc;
 815
 816         rc = kstrtobool(buffer, &val);
 817         if (rc)
 818                 return rc;
 819
 820         if (val)
 821                 set_bit(LL_SBI_AGL_ENABLED, sbi->ll_flags);
 822         else
 823                 clear_bit(LL_SBI_AGL_ENABLED, sbi->ll_flags);
 824
 825         return count;
 826 }
 827 LUSTRE_RW_ATTR(statahead_agl);
 828
 829 static int ll_statahead_stats_seq_show(struct seq_file *m, void *v)
 830 {
 831         struct super_block *sb = m->private;
 832         struct ll_sb_info *sbi = ll_s2sbi(sb);
 833
 834         seq_printf(m, "statahead total: %u\n"
 835                       "statahead wrong: %u\n"
 836                       "agl total: %u\n",
 837                    atomic_read(&sbi->ll_sa_total),
 838                    atomic_read(&sbi->ll_sa_wrong),
 839                    atomic_read(&sbi->ll_agl_total));
 840         return 0;
 841 }
 842
 843 LDEBUGFS_SEQ_FOPS_RO(ll_statahead_stats);
 844
 845 static ssize_t lazystatfs_show(struct kobject *kobj,
 846                                struct attribute *attr,
 847                                char *buf)
 848 {
 849         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 850                                               ll_kset.kobj);
 851
 852         return scnprintf(buf, PAGE_SIZE, "%u\n",
 853                          test_bit(LL_SBI_LAZYSTATFS, sbi->ll_flags));
 854 }
 855
 856 static ssize_t lazystatfs_store(struct kobject *kobj,
 857                                 struct attribute *attr,
 858                                 const char *buffer,
 859                                 size_t count)
 860 {
 861         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 862                                               ll_kset.kobj);
 863         bool val;
 864         int rc;
 865
 866         rc = kstrtobool(buffer, &val);
 867         if (rc)
 868                 return rc;
 869
 870         if (val)
 871                 set_bit(LL_SBI_LAZYSTATFS, sbi->ll_flags);
 872         else
 873                 clear_bit(LL_SBI_LAZYSTATFS, sbi->ll_flags);
 874
 875         return count;
 876 }
 877 LUSTRE_RW_ATTR(lazystatfs);
 878
 879 static ssize_t statfs_max_age_show(struct kobject *kobj, struct attribute *attr,
 880                                    char *buf)
 881 {
 882         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 883                                               ll_kset.kobj);
 884
 885         return scnprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_statfs_max_age);
 886 }
 887
 888 static ssize_t statfs_max_age_store(struct kobject *kobj,
 889                                     struct attribute *attr, const char *buffer,
 890                                     size_t count)
 891 {
 892         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 893                                               ll_kset.kobj);
 894         unsigned int val;
 895         int rc;
 896
 897         rc = kstrtouint(buffer, 10, &val);
 898         if (rc)
 899                 return rc;
 900         if (val > OBD_STATFS_CACHE_MAX_AGE)
 901                 return -EINVAL;
 902
 903         sbi->ll_statfs_max_age = val;
 904
 905         return count;
 906 }
 907 LUSTRE_RW_ATTR(statfs_max_age);
 908
 909 static ssize_t max_easize_show(struct kobject *kobj,
 910                                struct attribute *attr,
 911                                char *buf)
 912 {
 913         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 914                                               ll_kset.kobj);
 915         unsigned int ealen;
 916         int rc;
 917
 918         rc = ll_get_max_mdsize(sbi, &ealen);
 919         if (rc)
 920                 return rc;
 921
 922         /* Limit xattr size returned to userspace based on kernel maximum */
 923         return scnprintf(buf, PAGE_SIZE, "%u\n",
 924                          ealen > XATTR_SIZE_MAX ? XATTR_SIZE_MAX : ealen);
 925 }
 926 LUSTRE_RO_ATTR(max_easize);
 927
 928 /**
 929  * Get default_easize.
 930  *
 931  * \see client_obd::cl_default_mds_easize
 932  *
 933  * \param[in] m         seq_file handle
 934  * \param[in] v         unused for single entry
 935  *
 936  * \retval 0            on success
 937  * \retval negative     negated errno on failure
 938  */
 939 static ssize_t default_easize_show(struct kobject *kobj,
 940                                    struct attribute *attr,
 941                                    char *buf)
 942 {
 943         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 944                                               ll_kset.kobj);
 945         unsigned int ealen;
 946         int rc;
 947
 948         rc = ll_get_default_mdsize(sbi, &ealen);
 949         if (rc)
 950                 return rc;
 951
 952         /* Limit xattr size returned to userspace based on kernel maximum */
 953         return scnprintf(buf, PAGE_SIZE, "%u\n",
 954                          ealen > XATTR_SIZE_MAX ? XATTR_SIZE_MAX : ealen);
 955 }
 956
 957 /**
 958  * Set default_easize.
 959  *
 960  * Range checking on the passed value is handled by
 961  * ll_set_default_mdsize().
 962  *
 963  * \see client_obd::cl_default_mds_easize
 964  *
 965  * \param[in] file      proc file
 966  * \param[in] buffer    string passed from user space
 967  * \param[in] count     \a buffer length
 968  * \param[in] off       unused for single entry
 969  *
 970  * \retval positive     \a count on success
 971  * \retval negative     negated errno on failure
 972  */
 973 static ssize_t default_easize_store(struct kobject *kobj,
 974                                     struct attribute *attr,
 975                                     const char *buffer,
 976                                     size_t count)
 977 {
 978         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 979                                               ll_kset.kobj);
 980         unsigned int val;
 981         int rc;
 982
 983         if (count == 0)
 984                 return 0;
 985
 986         rc = kstrtouint(buffer, 10, &val);
 987         if (rc)
 988                 return rc;
 989
 990         rc = ll_set_default_mdsize(sbi, val);
 991         if (rc)
 992                 return rc;
 993
 994         return count;
 995 }
 996 LUSTRE_RW_ATTR(default_easize);
 997
 998 LDEBUGFS_SEQ_FOPS_RO(ll_sbi_flags);
 999
1000 static ssize_t xattr_cache_show(struct kobject *kobj,
1001                                 struct attribute *attr,
1002                                 char *buf)
1003 {
1004         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1005                                               ll_kset.kobj);
1006
1007         return sprintf(buf, "%u\n", sbi->ll_xattr_cache_enabled);
1008 }
1009
1010 static ssize_t xattr_cache_store(struct kobject *kobj,
1011                                  struct attribute *attr,
1012                                  const char *buffer,
1013                                  size_t count)
1014 {
1015         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1016                                               ll_kset.kobj);
1017         bool val;
1018         int rc;
1019
1020         rc = kstrtobool(buffer, &val);
1021         if (rc)
1022                 return rc;
1023
1024         if (val && !test_bit(LL_SBI_XATTR_CACHE, sbi->ll_flags))
1025                 return -ENOTSUPP;
1026
1027         sbi->ll_xattr_cache_enabled = val;
1028         sbi->ll_xattr_cache_set = 1;
1029
1030         return count;
1031 }
1032 LUSTRE_RW_ATTR(xattr_cache);
1033
1034 static ssize_t tiny_write_show(struct kobject *kobj,
1035                                struct attribute *attr,
1036                                char *buf)
1037 {
1038         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1039                                               ll_kset.kobj);
1040
1041         return scnprintf(buf, PAGE_SIZE, "%u\n",
1042                          test_bit(LL_SBI_TINY_WRITE, sbi->ll_flags));
1043 }
1044
1045 static ssize_t tiny_write_store(struct kobject *kobj,
1046                                 struct attribute *attr,
1047                                 const char *buffer,
1048                                 size_t count)
1049 {
1050         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1051                                               ll_kset.kobj);
1052         bool val;
1053         int rc;
1054
1055         rc = kstrtobool(buffer, &val);
1056         if (rc)
1057                 return rc;
1058
1059         spin_lock(&sbi->ll_lock);
1060         if (val)
1061                 set_bit(LL_SBI_TINY_WRITE, sbi->ll_flags);
1062         else
1063                 clear_bit(LL_SBI_TINY_WRITE, sbi->ll_flags);
1064         spin_unlock(&sbi->ll_lock);
1065
1066         return count;
1067 }
1068 LUSTRE_RW_ATTR(tiny_write);
1069
1070 static ssize_t parallel_dio_show(struct kobject *kobj,
1071                                  struct attribute *attr,
1072                                  char *buf)
1073 {
1074         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1075                                               ll_kset.kobj);
1076
1077         return snprintf(buf, PAGE_SIZE, "%u\n",
1078                         test_bit(LL_SBI_PARALLEL_DIO, sbi->ll_flags));
1079 }
1080
1081 static ssize_t parallel_dio_store(struct kobject *kobj,
1082                                   struct attribute *attr,
1083                                   const char *buffer,
1084                                   size_t count)
1085 {
1086         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1087                                               ll_kset.kobj);
1088         bool val;
1089         int rc;
1090
1091         rc = kstrtobool(buffer, &val);
1092         if (rc)
1093                 return rc;
1094
1095         spin_lock(&sbi->ll_lock);
1096         if (val)
1097                 set_bit(LL_SBI_PARALLEL_DIO, sbi->ll_flags);
1098         else
1099                 clear_bit(LL_SBI_PARALLEL_DIO, sbi->ll_flags);
1100         spin_unlock(&sbi->ll_lock);
1101
1102         return count;
1103 }
1104 LUSTRE_RW_ATTR(parallel_dio);
1105
1106 static ssize_t max_read_ahead_async_active_show(struct kobject *kobj,
1107                                                struct attribute *attr,
1108                                                char *buf)
1109 {
1110         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1111                                               ll_kset.kobj);
1112
1113         return scnprintf(buf, PAGE_SIZE, "%u\n",
1114                          sbi->ll_ra_info.ra_async_max_active);
1115 }
1116
1117 static ssize_t max_read_ahead_async_active_store(struct kobject *kobj,
1118                                                  struct attribute *attr,
1119                                                  const char *buffer,
1120                                                  size_t count)
1121 {
1122         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1123                                               ll_kset.kobj);
1124         unsigned int val;
1125         int rc;
1126
1127         rc = kstrtouint(buffer, 10, &val);
1128         if (rc)
1129                 return rc;
1130
1131         /**
1132          * It doesn't make any sense to make it exceed what
1133          * workqueue could acutally support. This can easily
1134          * over subscripe the cores but Lustre internally
1135          * throttles to avoid those impacts.
1136          */
1137         if (val > WQ_UNBOUND_MAX_ACTIVE) {
1138                 CERROR("%s: cannot set max_read_ahead_async_active=%u larger than %u\n",
1139                        sbi->ll_fsname, val, WQ_UNBOUND_MAX_ACTIVE);
1140                 return -ERANGE;
1141         }
1142
1143         spin_lock(&sbi->ll_lock);
1144         sbi->ll_ra_info.ra_async_max_active = val;
1145         spin_unlock(&sbi->ll_lock);
1146
1147         return count;
1148 }
1149 LUSTRE_RW_ATTR(max_read_ahead_async_active);
1150
1151 static ssize_t read_ahead_async_file_threshold_mb_show(struct kobject *kobj,
1152                                                        struct attribute *attr,
1153                                                        char *buf)
1154 {
1155         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1156                                               ll_kset.kobj);
1157
1158         return scnprintf(buf, PAGE_SIZE, "%lu\n", PAGES_TO_MiB(
1159                          sbi->ll_ra_info.ra_async_pages_per_file_threshold));
1160 }
1161
1162 static ssize_t
1163 read_ahead_async_file_threshold_mb_store(struct kobject *kobj,
1164                                          struct attribute *attr,
1165                                          const char *buffer, size_t count)
1166 {
1167         unsigned long pages_number;
1168         unsigned long max_ra_per_file;
1169         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1170                                               ll_kset.kobj);
1171         int rc;
1172
1173         rc = kstrtoul(buffer, 10, &pages_number);
1174         if (rc)
1175                 return rc;
1176
1177         pages_number = MiB_TO_PAGES(pages_number);
1178         max_ra_per_file = sbi->ll_ra_info.ra_max_pages_per_file;
1179         if (pages_number < 0 || pages_number > max_ra_per_file) {
1180                 CERROR("%s: can't set read_ahead_async_file_threshold_mb=%lu > "
1181                        "max_read_readahead_per_file_mb=%lu\n", sbi->ll_fsname,
1182                        PAGES_TO_MiB(pages_number),
1183                        PAGES_TO_MiB(max_ra_per_file));
1184                 return -ERANGE;
1185         }
1186         sbi->ll_ra_info.ra_async_pages_per_file_threshold = pages_number;
1187
1188         return count;
1189 }
1190 LUSTRE_RW_ATTR(read_ahead_async_file_threshold_mb);
1191
1192 static ssize_t read_ahead_range_kb_show(struct kobject *kobj,
1193                                         struct attribute *attr,char *buf)
1194 {
1195         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1196                                               ll_kset.kobj);
1197
1198         return snprintf(buf, PAGE_SIZE, "%lu\n",
1199                         sbi->ll_ra_info.ra_range_pages << (PAGE_SHIFT - 10));
1200 }
1201
1202 static ssize_t
1203 read_ahead_range_kb_store(struct kobject *kobj,
1204                                struct attribute *attr,
1205                                const char *buffer, size_t count)
1206 {
1207         unsigned long pages_number;
1208         unsigned long max_ra_per_file;
1209         u64 val;
1210         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1211                                               ll_kset.kobj);
1212         int rc;
1213
1214         rc = sysfs_memparse(buffer, count, &val, "KiB");
1215         if (rc < 0)
1216                 return rc;
1217
1218         pages_number = val >> PAGE_SHIFT;
1219         /* Disable mmap range read */
1220         if (pages_number == 0)
1221                 goto out;
1222
1223         max_ra_per_file = sbi->ll_ra_info.ra_max_pages_per_file;
1224         if (pages_number > max_ra_per_file ||
1225             pages_number < RA_MIN_MMAP_RANGE_PAGES)
1226                 return -ERANGE;
1227
1228 out:
1229         spin_lock(&sbi->ll_lock);
1230         sbi->ll_ra_info.ra_range_pages = pages_number;
1231         spin_unlock(&sbi->ll_lock);
1232
1233         return count;
1234 }
1235 LUSTRE_RW_ATTR(read_ahead_range_kb);
1236
1237 static ssize_t fast_read_show(struct kobject *kobj,
1238                               struct attribute *attr,
1239                               char *buf)
1240 {
1241         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1242                                               ll_kset.kobj);
1243
1244         return scnprintf(buf, PAGE_SIZE, "%u\n",
1245                          test_bit(LL_SBI_FAST_READ, sbi->ll_flags));
1246 }
1247
1248 static ssize_t fast_read_store(struct kobject *kobj,
1249                                struct attribute *attr,
1250                                const char *buffer,
1251                                size_t count)
1252 {
1253         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1254                                               ll_kset.kobj);
1255         bool val;
1256         int rc;
1257
1258         rc = kstrtobool(buffer, &val);
1259         if (rc)
1260                 return rc;
1261
1262         spin_lock(&sbi->ll_lock);
1263         if (val)
1264                 set_bit(LL_SBI_FAST_READ, sbi->ll_flags);
1265         else
1266                 clear_bit(LL_SBI_FAST_READ, sbi->ll_flags);
1267         spin_unlock(&sbi->ll_lock);
1268
1269         return count;
1270 }
1271 LUSTRE_RW_ATTR(fast_read);
1272
1273 static ssize_t file_heat_show(struct kobject *kobj,
1274                               struct attribute *attr,
1275                               char *buf)
1276 {
1277         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1278                                               ll_kset.kobj);
1279
1280         return scnprintf(buf, PAGE_SIZE, "%u\n",
1281                          test_bit(LL_SBI_FILE_HEAT, sbi->ll_flags));
1282 }
1283
1284 static ssize_t file_heat_store(struct kobject *kobj,
1285                                struct attribute *attr,
1286                                const char *buffer,
1287                                size_t count)
1288 {
1289         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1290                                               ll_kset.kobj);
1291         bool val;
1292         int rc;
1293
1294         rc = kstrtobool(buffer, &val);
1295         if (rc)
1296                 return rc;
1297
1298         spin_lock(&sbi->ll_lock);
1299         if (val)
1300                 set_bit(LL_SBI_FILE_HEAT, sbi->ll_flags);
1301         else
1302                 clear_bit(LL_SBI_FILE_HEAT, sbi->ll_flags);
1303         spin_unlock(&sbi->ll_lock);
1304
1305         return count;
1306 }
1307 LUSTRE_RW_ATTR(file_heat);
1308
1309 static ssize_t heat_decay_percentage_show(struct kobject *kobj,
1310                                           struct attribute *attr,
1311                                           char *buf)
1312 {
1313         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1314                                               ll_kset.kobj);
1315
1316         return scnprintf(buf, PAGE_SIZE, "%u\n",
1317                          (sbi->ll_heat_decay_weight * 100 + 128) / 256);
1318 }
1319
1320 static ssize_t heat_decay_percentage_store(struct kobject *kobj,
1321                                            struct attribute *attr,
1322                                            const char *buffer,
1323                                            size_t count)
1324 {
1325         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1326                                               ll_kset.kobj);
1327         unsigned long val;
1328         int rc;
1329
1330         rc = kstrtoul(buffer, 10, &val);
1331         if (rc)
1332                 return rc;
1333
1334         if (val < 0 || val > 100)
1335                 return -ERANGE;
1336
1337         sbi->ll_heat_decay_weight = (val * 256 + 50) / 100;
1338
1339         return count;
1340 }
1341 LUSTRE_RW_ATTR(heat_decay_percentage);
1342
1343 static ssize_t heat_period_second_show(struct kobject *kobj,
1344                                        struct attribute *attr,
1345                                        char *buf)
1346 {
1347         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1348                                               ll_kset.kobj);
1349
1350         return scnprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_heat_period_second);
1351 }
1352
1353 static ssize_t heat_period_second_store(struct kobject *kobj,
1354                                         struct attribute *attr,
1355                                         const char *buffer,
1356                                         size_t count)
1357 {
1358         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1359                                               ll_kset.kobj);
1360         unsigned long val;
1361         int rc;
1362
1363         rc = kstrtoul(buffer, 10, &val);
1364         if (rc)
1365                 return rc;
1366
1367         if (val <= 0)
1368                 return -ERANGE;
1369
1370         sbi->ll_heat_period_second = val;
1371
1372         return count;
1373 }
1374 LUSTRE_RW_ATTR(heat_period_second);
1375
1376 static ssize_t opencache_threshold_count_show(struct kobject *kobj,
1377                                               struct attribute *attr,
1378                                               char *buf)
1379 {
1380         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1381                                               ll_kset.kobj);
1382
1383         if (sbi->ll_oc_thrsh_count)
1384                 return snprintf(buf, PAGE_SIZE, "%u\n",
1385                                 sbi->ll_oc_thrsh_count);
1386         else
1387                 return snprintf(buf, PAGE_SIZE, "off\n");
1388 }
1389
1390 static ssize_t opencache_threshold_count_store(struct kobject *kobj,
1391                                                struct attribute *attr,
1392                                                const char *buffer,
1393                                                size_t count)
1394 {
1395         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1396                                               ll_kset.kobj);
1397         unsigned int val;
1398         int rc;
1399
1400         rc = kstrtouint(buffer, 10, &val);
1401         if (rc) {
1402                 bool enable;
1403                 /* also accept "off" to disable and "on" to always cache */
1404                 rc = kstrtobool(buffer, &enable);
1405                 if (rc)
1406                         return rc;
1407                 val = enable;
1408         }
1409         sbi->ll_oc_thrsh_count = val;
1410
1411         return count;
1412 }
1413 LUSTRE_RW_ATTR(opencache_threshold_count);
1414
1415 static ssize_t opencache_threshold_ms_show(struct kobject *kobj,
1416                                            struct attribute *attr,
1417                                            char *buf)
1418 {
1419         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1420                                               ll_kset.kobj);
1421
1422         return snprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_oc_thrsh_ms);
1423 }
1424
1425 static ssize_t opencache_threshold_ms_store(struct kobject *kobj,
1426                                             struct attribute *attr,
1427                                             const char *buffer,
1428                                             size_t count)
1429 {
1430         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1431                                               ll_kset.kobj);
1432         unsigned int val;
1433         int rc;
1434
1435         rc = kstrtouint(buffer, 10, &val);
1436         if (rc)
1437                 return rc;
1438
1439         sbi->ll_oc_thrsh_ms = val;
1440
1441         return count;
1442 }
1443 LUSTRE_RW_ATTR(opencache_threshold_ms);
1444
1445 static ssize_t opencache_max_ms_show(struct kobject *kobj,
1446                                      struct attribute *attr,
1447                                      char *buf)
1448 {
1449         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1450                                               ll_kset.kobj);
1451
1452         return snprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_oc_max_ms);
1453 }
1454
1455 static ssize_t opencache_max_ms_store(struct kobject *kobj,
1456                                       struct attribute *attr,
1457                                       const char *buffer,
1458                                       size_t count)
1459 {
1460         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1461                                               ll_kset.kobj);
1462         unsigned int val;
1463         int rc;
1464
1465         rc = kstrtouint(buffer, 10, &val);
1466         if (rc)
1467                 return rc;
1468
1469         sbi->ll_oc_max_ms = val;
1470
1471         return count;
1472 }
1473 LUSTRE_RW_ATTR(opencache_max_ms);
1474
1475 static ssize_t inode_cache_show(struct kobject *kobj,
1476                                 struct attribute *attr,
1477                                 char *buf)
1478 {
1479         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1480                                               ll_kset.kobj);
1481
1482         return snprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_inode_cache_enabled);
1483 }
1484
1485 static ssize_t inode_cache_store(struct kobject *kobj,
1486                                  struct attribute *attr,
1487                                  const char *buffer,
1488                                  size_t count)
1489 {
1490         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1491                                               ll_kset.kobj);
1492         bool val;
1493         int rc;
1494
1495         rc = kstrtobool(buffer, &val);
1496         if (rc)
1497                 return rc;
1498
1499         sbi->ll_inode_cache_enabled = val;
1500
1501         return count;
1502 }
1503 LUSTRE_RW_ATTR(inode_cache);
1504
1505 static int ll_unstable_stats_seq_show(struct seq_file *m, void *v)
1506 {
1507         struct super_block      *sb    = m->private;
1508         struct ll_sb_info       *sbi   = ll_s2sbi(sb);
1509         struct cl_client_cache  *cache = sbi->ll_cache;
1510         long pages;
1511         int mb;
1512
1513         pages = atomic_long_read(&cache->ccc_unstable_nr);
1514         mb    = (pages * PAGE_SIZE) >> 20;
1515
1516         seq_printf(m, "unstable_check:     %8d\n"
1517                       "unstable_pages: %12ld\n"
1518                       "unstable_mb:        %8d\n",
1519                    cache->ccc_unstable_check, pages, mb);
1520         return 0;
1521 }
1522
1523 static ssize_t ll_unstable_stats_seq_write(struct file *file,
1524                                            const char __user *buffer,
1525                                            size_t count, loff_t *unused)
1526 {
1527         struct seq_file *seq = file->private_data;
1528         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)seq->private);
1529         char kernbuf[128];
1530         bool val;
1531         int rc;
1532
1533         if (count == 0)
1534                 return 0;
1535         if (count >= sizeof(kernbuf))
1536                 return -EINVAL;
1537
1538         if (copy_from_user(kernbuf, buffer, count))
1539                 return -EFAULT;
1540         kernbuf[count] = 0;
1541
1542         buffer += lprocfs_find_named_value(kernbuf, "unstable_check:", &count) -
1543                   kernbuf;
1544         rc = kstrtobool_from_user(buffer, count, &val);
1545         if (rc < 0)
1546                 return rc;
1547
1548         /* borrow lru lock to set the value */
1549         spin_lock(&sbi->ll_cache->ccc_lru_lock);
1550         sbi->ll_cache->ccc_unstable_check = val;
1551         spin_unlock(&sbi->ll_cache->ccc_lru_lock);
1552
1553         return count;
1554 }
1555
1556 LDEBUGFS_SEQ_FOPS(ll_unstable_stats);
1557
1558 static int ll_root_squash_seq_show(struct seq_file *m, void *v)
1559 {
1560         struct super_block *sb = m->private;
1561         struct ll_sb_info *sbi = ll_s2sbi(sb);
1562         struct root_squash_info *squash = &sbi->ll_squash;
1563
1564         seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
1565         return 0;
1566 }
1567
1568 static ssize_t ll_root_squash_seq_write(struct file *file,
1569                                         const char __user *buffer,
1570                                         size_t count, loff_t *off)
1571 {
1572         struct seq_file *m = file->private_data;
1573         struct super_block *sb = m->private;
1574         struct ll_sb_info *sbi = ll_s2sbi(sb);
1575         struct root_squash_info *squash = &sbi->ll_squash;
1576
1577         return lprocfs_wr_root_squash(buffer, count, squash, sbi->ll_fsname);
1578 }
1579
1580 LDEBUGFS_SEQ_FOPS(ll_root_squash);
1581
1582 static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
1583 {
1584         struct super_block *sb = m->private;
1585         struct ll_sb_info *sbi = ll_s2sbi(sb);
1586         struct root_squash_info *squash = &sbi->ll_squash;
1587         int len;
1588
1589         spin_lock(&squash->rsi_lock);
1590         if (!list_empty(&squash->rsi_nosquash_nids)) {
1591                 len = cfs_print_nidlist(m->buf + m->count, m->size - m->count,
1592                                         &squash->rsi_nosquash_nids);
1593                 m->count += len;
1594                 seq_putc(m, '\n');
1595         } else {
1596                 seq_puts(m, "NONE\n");
1597         }
1598         spin_unlock(&squash->rsi_lock);
1599
1600         return 0;
1601 }
1602
1603 static ssize_t ll_nosquash_nids_seq_write(struct file *file,
1604                                           const char __user *buffer,
1605                                           size_t count, loff_t *off)
1606 {
1607         struct seq_file *m = file->private_data;
1608         struct super_block *sb = m->private;
1609         struct ll_sb_info *sbi = ll_s2sbi(sb);
1610         struct root_squash_info *squash = &sbi->ll_squash;
1611         int rc;
1612
1613         rc = lprocfs_wr_nosquash_nids(buffer, count, squash, sbi->ll_fsname);
1614         if (rc < 0)
1615                 return rc;
1616
1617         ll_compute_rootsquash_state(sbi);
1618
1619         return rc;
1620 }
1621
1622 LDEBUGFS_SEQ_FOPS(ll_nosquash_nids);
1623
1624 static int ll_filename_enc_seq_show(struct seq_file *m, void *v)
1625 {
1626         struct super_block *sb = m->private;
1627         struct lustre_sb_info *lsi = s2lsi(sb);
1628
1629         seq_printf(m, "%u\n", lsi->lsi_flags & LSI_FILENAME_ENC ? 1 : 0);
1630         return 0;
1631 }
1632
1633 static ssize_t ll_filename_enc_seq_write(struct file *file,
1634                                          const char __user *buffer,
1635                                          size_t count, loff_t *off)
1636 {
1637         struct seq_file *m = file->private_data;
1638         struct super_block *sb = m->private;
1639         struct lustre_sb_info *lsi = s2lsi(sb);
1640         bool val;
1641         int rc;
1642
1643         rc = kstrtobool_from_user(buffer, count, &val);
1644         if (rc)
1645                 return rc;
1646
1647         if (val)
1648                 lsi->lsi_flags |= LSI_FILENAME_ENC;
1649         else
1650                 lsi->lsi_flags &= ~LSI_FILENAME_ENC;
1651
1652         return count;
1653 }
1654
1655 LDEBUGFS_SEQ_FOPS(ll_filename_enc);
1656
1657 static int ll_pcc_seq_show(struct seq_file *m, void *v)
1658 {
1659         struct super_block *sb = m->private;
1660         struct ll_sb_info *sbi = ll_s2sbi(sb);
1661
1662         return pcc_super_dump(&sbi->ll_pcc_super, m);
1663 }
1664
1665 static ssize_t ll_pcc_seq_write(struct file *file, const char __user *buffer,
1666                                 size_t count, loff_t *off)
1667 {
1668         struct seq_file *m = file->private_data;
1669         struct super_block *sb = m->private;
1670         struct ll_sb_info *sbi = ll_s2sbi(sb);
1671         int rc;
1672         char *kernbuf;
1673
1674         if (count >= LPROCFS_WR_PCC_MAX_CMD)
1675                 return -EINVAL;
1676
1677         if (!(exp_connect_flags2(sbi->ll_md_exp) & OBD_CONNECT2_PCC))
1678                 return -EOPNOTSUPP;
1679
1680         OBD_ALLOC(kernbuf, count + 1);
1681         if (kernbuf == NULL)
1682                 return -ENOMEM;
1683
1684         if (copy_from_user(kernbuf, buffer, count))
1685                 GOTO(out_free_kernbuff, rc = -EFAULT);
1686
1687         rc = pcc_cmd_handle(kernbuf, count, &sbi->ll_pcc_super);
1688 out_free_kernbuff:
1689         OBD_FREE(kernbuf, count + 1);
1690         return rc ? rc : count;
1691 }
1692 LDEBUGFS_SEQ_FOPS(ll_pcc);
1693
1694 struct ldebugfs_vars lprocfs_llite_obd_vars[] = {
1695         { .name =       "site",
1696           .fops =       &ll_site_stats_fops                     },
1697         { .name =       "max_cached_mb",
1698           .fops =       &ll_max_cached_mb_fops                  },
1699         { .name =       "statahead_stats",
1700           .fops =       &ll_statahead_stats_fops                },
1701         { .name =       "unstable_stats",
1702           .fops =       &ll_unstable_stats_fops                 },
1703         { .name =       "sbi_flags",
1704           .fops =       &ll_sbi_flags_fops                      },
1705         { .name =       "root_squash",
1706           .fops =       &ll_root_squash_fops                    },
1707         { .name =       "nosquash_nids",
1708           .fops =       &ll_nosquash_nids_fops                  },
1709         { .name =       "pcc",
1710           .fops =       &ll_pcc_fops,                           },
1711         { .name =       "enable_filename_encryption",
1712           .fops =       &ll_filename_enc_fops,                  },
1713         { NULL }
1714 };
1715
1716 #define MAX_STRING_SIZE 128
1717
1718 static struct attribute *llite_attrs[] = {
1719         &lustre_attr_blocksize.attr,
1720         &lustre_attr_stat_blocksize.attr,
1721         &lustre_attr_kbytestotal.attr,
1722         &lustre_attr_kbytesfree.attr,
1723         &lustre_attr_kbytesavail.attr,
1724         &lustre_attr_filestotal.attr,
1725         &lustre_attr_filesfree.attr,
1726         &lustre_attr_client_type.attr,
1727         &lustre_attr_foreign_symlink_enable.attr,
1728         &lustre_attr_foreign_symlink_prefix.attr,
1729         &lustre_attr_foreign_symlink_upcall.attr,
1730         &lustre_attr_foreign_symlink_upcall_info.attr,
1731         &lustre_attr_fstype.attr,
1732         &lustre_attr_uuid.attr,
1733         &lustre_attr_checksums.attr,
1734         &lustre_attr_checksum_pages.attr,
1735         &lustre_attr_max_read_ahead_mb.attr,
1736         &lustre_attr_max_read_ahead_per_file_mb.attr,
1737         &lustre_attr_max_read_ahead_whole_mb.attr,
1738         &lustre_attr_max_read_ahead_async_active.attr,
1739         &lustre_attr_read_ahead_async_file_threshold_mb.attr,
1740         &lustre_attr_read_ahead_range_kb.attr,
1741         &lustre_attr_stats_track_pid.attr,
1742         &lustre_attr_stats_track_ppid.attr,
1743         &lustre_attr_stats_track_gid.attr,
1744         &lustre_attr_statahead_running_max.attr,
1745         &lustre_attr_statahead_max.attr,
1746         &lustre_attr_statahead_agl.attr,
1747         &lustre_attr_lazystatfs.attr,
1748         &lustre_attr_statfs_max_age.attr,
1749         &lustre_attr_max_easize.attr,
1750         &lustre_attr_default_easize.attr,
1751         &lustre_attr_xattr_cache.attr,
1752         &lustre_attr_fast_read.attr,
1753         &lustre_attr_tiny_write.attr,
1754         &lustre_attr_parallel_dio.attr,
1755         &lustre_attr_file_heat.attr,
1756         &lustre_attr_heat_decay_percentage.attr,
1757         &lustre_attr_heat_period_second.attr,
1758         &lustre_attr_opencache_threshold_count.attr,
1759         &lustre_attr_opencache_threshold_ms.attr,
1760         &lustre_attr_opencache_max_ms.attr,
1761         &lustre_attr_inode_cache.attr,
1762         NULL,
1763 };
1764
1765 static void sbi_kobj_release(struct kobject *kobj)
1766 {
1767         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1768                                               ll_kset.kobj);
1769         complete(&sbi->ll_kobj_unregister);
1770 }
1771
1772 static struct kobj_type sbi_ktype = {
1773         .default_attrs  = llite_attrs,
1774         .sysfs_ops      = &lustre_sysfs_ops,
1775         .release        = sbi_kobj_release,
1776 };
1777
1778 static const struct llite_file_opcode {
1779         __u32           opcode;
1780         __u32           type;
1781         const char      *opname;
1782 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
1783         /* file operation */
1784         { LPROC_LL_READ_BYTES,  LPROCFS_TYPE_BYTES_FULL, "read_bytes" },
1785         { LPROC_LL_WRITE_BYTES, LPROCFS_TYPE_BYTES_FULL, "write_bytes" },
1786         { LPROC_LL_READ,        LPROCFS_TYPE_LATENCY,   "read" },
1787         { LPROC_LL_WRITE,       LPROCFS_TYPE_LATENCY,   "write" },
1788         { LPROC_LL_IOCTL,       LPROCFS_TYPE_REQS,      "ioctl" },
1789         { LPROC_LL_OPEN,        LPROCFS_TYPE_LATENCY,   "open" },
1790         { LPROC_LL_RELEASE,     LPROCFS_TYPE_LATENCY,   "close" },
1791         { LPROC_LL_MMAP,        LPROCFS_TYPE_LATENCY,   "mmap" },
1792         { LPROC_LL_FAULT,       LPROCFS_TYPE_LATENCY,   "page_fault" },
1793         { LPROC_LL_MKWRITE,     LPROCFS_TYPE_LATENCY,   "page_mkwrite" },
1794         { LPROC_LL_LLSEEK,      LPROCFS_TYPE_LATENCY,   "seek" },
1795         { LPROC_LL_FSYNC,       LPROCFS_TYPE_LATENCY,   "fsync" },
1796         { LPROC_LL_READDIR,     LPROCFS_TYPE_LATENCY,   "readdir" },
1797         { LPROC_LL_INODE_OCOUNT,LPROCFS_TYPE_REQS |
1798                                 LPROCFS_CNTR_AVGMINMAX |
1799                                 LPROCFS_CNTR_STDDEV,    "opencount" },
1800         { LPROC_LL_INODE_OPCLTM,LPROCFS_TYPE_LATENCY,   "openclosetime" },
1801         /* inode operation */
1802         { LPROC_LL_SETATTR,     LPROCFS_TYPE_LATENCY,   "setattr" },
1803         { LPROC_LL_TRUNC,       LPROCFS_TYPE_LATENCY,   "truncate" },
1804         { LPROC_LL_FLOCK,       LPROCFS_TYPE_LATENCY,   "flock" },
1805         { LPROC_LL_GETATTR,     LPROCFS_TYPE_LATENCY,   "getattr" },
1806         { LPROC_LL_FALLOCATE,   LPROCFS_TYPE_LATENCY, "fallocate"},
1807         /* dir inode operation */
1808         { LPROC_LL_CREATE,      LPROCFS_TYPE_LATENCY,   "create" },
1809         { LPROC_LL_LINK,        LPROCFS_TYPE_LATENCY,   "link" },
1810         { LPROC_LL_UNLINK,      LPROCFS_TYPE_LATENCY,   "unlink" },
1811         { LPROC_LL_SYMLINK,     LPROCFS_TYPE_LATENCY,   "symlink" },
1812         { LPROC_LL_MKDIR,       LPROCFS_TYPE_LATENCY,   "mkdir" },
1813         { LPROC_LL_RMDIR,       LPROCFS_TYPE_LATENCY,   "rmdir" },
1814         { LPROC_LL_MKNOD,       LPROCFS_TYPE_LATENCY,   "mknod" },
1815         { LPROC_LL_RENAME,      LPROCFS_TYPE_LATENCY,   "rename" },
1816         /* special inode operation */
1817         { LPROC_LL_STATFS,      LPROCFS_TYPE_LATENCY,   "statfs" },
1818         { LPROC_LL_SETXATTR,    LPROCFS_TYPE_LATENCY,   "setxattr" },
1819         { LPROC_LL_GETXATTR,    LPROCFS_TYPE_LATENCY,   "getxattr" },
1820         { LPROC_LL_GETXATTR_HITS, LPROCFS_TYPE_REQS,    "getxattr_hits" },
1821         { LPROC_LL_LISTXATTR,   LPROCFS_TYPE_LATENCY,   "listxattr" },
1822         { LPROC_LL_REMOVEXATTR, LPROCFS_TYPE_LATENCY,   "removexattr" },
1823         { LPROC_LL_INODE_PERM,  LPROCFS_TYPE_LATENCY,   "inode_permission" },
1824 };
1825
1826 void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, long count)
1827 {
1828         if (!sbi->ll_stats)
1829                 return;
1830
1831         if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
1832                 lprocfs_counter_add(sbi->ll_stats, op, count);
1833         else if (sbi->ll_stats_track_type == STATS_TRACK_PID &&
1834                  sbi->ll_stats_track_id == current->pid)
1835                 lprocfs_counter_add(sbi->ll_stats, op, count);
1836         else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
1837                  sbi->ll_stats_track_id == current->real_parent->pid)
1838                 lprocfs_counter_add(sbi->ll_stats, op, count);
1839         else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
1840                  sbi->ll_stats_track_id ==
1841                         from_kgid(&init_user_ns, current_gid()))
1842                 lprocfs_counter_add(sbi->ll_stats, op, count);
1843 }
1844 EXPORT_SYMBOL(ll_stats_ops_tally);
1845
1846 static const char *const ra_stat_string[] = {
1847         [RA_STAT_HIT]                   = "hits",
1848         [RA_STAT_MISS]                  = "misses",
1849         [RA_STAT_DISTANT_READPAGE]      = "readpage_not_consecutive",
1850         [RA_STAT_MISS_IN_WINDOW]        = "miss_inside_window",
1851         [RA_STAT_FAILED_GRAB_PAGE]      = "failed_grab_cache_page",
1852         [RA_STAT_FAILED_MATCH]          = "failed_lock_match",
1853         [RA_STAT_DISCARDED]             = "read_but_discarded",
1854         [RA_STAT_ZERO_LEN]              = "zero_length_file",
1855         [RA_STAT_ZERO_WINDOW]           = "zero_size_window",
1856         [RA_STAT_EOF]                   = "readahead_to_eof",
1857         [RA_STAT_MAX_IN_FLIGHT]         = "hit_max_readahead_issue",
1858         [RA_STAT_WRONG_GRAB_PAGE]       = "wrong_page_from_grab_cache_page",
1859         [RA_STAT_FAILED_REACH_END]      = "failed_to_reach_end",
1860         [RA_STAT_ASYNC]                 = "async_readahead",
1861         [RA_STAT_FAILED_FAST_READ]      = "failed_to_fast_read",
1862         [RA_STAT_MMAP_RANGE_READ]       = "mmap_range_read",
1863 };
1864
1865 int ll_debugfs_register_super(struct super_block *sb, const char *name)
1866 {
1867         struct lustre_sb_info *lsi = s2lsi(sb);
1868         struct ll_sb_info *sbi = ll_s2sbi(sb);
1869         int err, id;
1870
1871         ENTRY;
1872         LASSERT(sbi);
1873
1874         if (IS_ERR_OR_NULL(llite_root))
1875                 goto out_ll_kset;
1876
1877         sbi->ll_debugfs_entry = debugfs_create_dir(name, llite_root);
1878         ldebugfs_add_vars(sbi->ll_debugfs_entry, lprocfs_llite_obd_vars, sb);
1879
1880         debugfs_create_file("dump_page_cache", 0444, sbi->ll_debugfs_entry, sbi,
1881                             &vvp_dump_pgcache_file_ops);
1882
1883         debugfs_create_file("extents_stats", 0644, sbi->ll_debugfs_entry, sbi,
1884                                  &ll_rw_extents_stats_fops);
1885
1886         debugfs_create_file("extents_stats_per_process", 0644,
1887                             sbi->ll_debugfs_entry, sbi,
1888                             &ll_rw_extents_stats_pp_fops);
1889
1890         debugfs_create_file("offset_stats", 0644, sbi->ll_debugfs_entry, sbi,
1891                             &ll_rw_offset_stats_fops);
1892
1893         /* File operations stats */
1894         sbi->ll_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES,
1895                                             LPROCFS_STATS_FLAG_NONE);
1896         if (sbi->ll_stats == NULL)
1897                 GOTO(out_debugfs, err = -ENOMEM);
1898
1899         /* do counter init */
1900         for (id = 0; id < LPROC_LL_FILE_OPCODES; id++) {
1901                 u32 type = llite_opcode_table[id].type;
1902                 void *ptr = "unknown";
1903
1904                 if (type & LPROCFS_TYPE_REQS)
1905                         ptr = "reqs";
1906                 else if (type & LPROCFS_TYPE_BYTES)
1907                         ptr = "bytes";
1908                 else if (type & LPROCFS_TYPE_USEC)
1909                         ptr = "usec";
1910                 lprocfs_counter_init(sbi->ll_stats,
1911                                      llite_opcode_table[id].opcode, type,
1912                                      llite_opcode_table[id].opname, ptr);
1913         }
1914
1915         debugfs_create_file("stats", 0644, sbi->ll_debugfs_entry,
1916                             sbi->ll_stats, &ldebugfs_stats_seq_fops);
1917
1918         sbi->ll_ra_stats = lprocfs_alloc_stats(ARRAY_SIZE(ra_stat_string),
1919                                                LPROCFS_STATS_FLAG_NONE);
1920         if (sbi->ll_ra_stats == NULL)
1921                 GOTO(out_stats, err = -ENOMEM);
1922
1923         for (id = 0; id < ARRAY_SIZE(ra_stat_string); id++)
1924                 lprocfs_counter_init(sbi->ll_ra_stats, id, 0,
1925                                      ra_stat_string[id], "pages");
1926
1927         debugfs_create_file("read_ahead_stats", 0644, sbi->ll_debugfs_entry,
1928                             sbi->ll_ra_stats, &ldebugfs_stats_seq_fops);
1929
1930 out_ll_kset:
1931         /* Yes we also register sysfs mount kset here as well */
1932         sbi->ll_kset.kobj.parent = llite_kobj;
1933         sbi->ll_kset.kobj.ktype = &sbi_ktype;
1934         init_completion(&sbi->ll_kobj_unregister);
1935         err = kobject_set_name(&sbi->ll_kset.kobj, "%s", name);
1936         if (err)
1937                 GOTO(out_ra_stats, err);
1938
1939         err = kset_register(&sbi->ll_kset);
1940         if (err)
1941                 GOTO(out_ra_stats, err);
1942
1943         lsi->lsi_kobj = kobject_get(&sbi->ll_kset.kobj);
1944
1945         RETURN(0);
1946 out_ra_stats:
1947         lprocfs_free_stats(&sbi->ll_ra_stats);
1948 out_stats:
1949         lprocfs_free_stats(&sbi->ll_stats);
1950 out_debugfs:
1951         debugfs_remove_recursive(sbi->ll_debugfs_entry);
1952
1953         RETURN(err);
1954 }
1955
1956 void ll_debugfs_unregister_super(struct super_block *sb)
1957 {
1958         struct lustre_sb_info *lsi = s2lsi(sb);
1959         struct ll_sb_info *sbi = ll_s2sbi(sb);
1960
1961         debugfs_remove_recursive(sbi->ll_debugfs_entry);
1962
1963         if (sbi->ll_dt_obd)
1964                 sysfs_remove_link(&sbi->ll_kset.kobj,
1965                                   sbi->ll_dt_obd->obd_type->typ_name);
1966
1967         if (sbi->ll_md_obd)
1968                 sysfs_remove_link(&sbi->ll_kset.kobj,
1969                                   sbi->ll_md_obd->obd_type->typ_name);
1970
1971         kobject_put(lsi->lsi_kobj);
1972
1973         kset_unregister(&sbi->ll_kset);
1974         wait_for_completion(&sbi->ll_kobj_unregister);
1975
1976         lprocfs_free_stats(&sbi->ll_ra_stats);
1977         lprocfs_free_stats(&sbi->ll_stats);
1978 }
1979 #undef MAX_STRING_SIZE
1980
1981 static void ll_display_extents_info(struct ll_rw_extents_info *rw_extents,
1982                                     struct seq_file *seq, int which)
1983 {
1984         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
1985         unsigned long start, end, r, w;
1986         char *unitp = "KMGTPEZY";
1987         int i, units = 10;
1988         struct per_process_info *pp_info;
1989
1990         pp_info = &rw_extents->pp_extents[which];
1991         read_cum = 0;
1992         write_cum = 0;
1993         start = 0;
1994
1995         for (i = 0; i < LL_HIST_MAX; i++) {
1996                 read_tot += pp_info->pp_r_hist.oh_buckets[i];
1997                 write_tot += pp_info->pp_w_hist.oh_buckets[i];
1998         }
1999
2000         for (i = 0; i < LL_HIST_MAX; i++) {
2001                 r = pp_info->pp_r_hist.oh_buckets[i];
2002                 w = pp_info->pp_w_hist.oh_buckets[i];
2003                 read_cum += r;
2004                 write_cum += w;
2005                 end = 1 << (i + LL_HIST_START - units);
2006                 seq_printf(seq, "%4lu%c - %4lu%c%c: %14lu %4u %4u  | "
2007                            "%14lu %4u %4u\n", start, *unitp, end, *unitp,
2008                            (i == LL_HIST_MAX - 1) ? '+' : ' ',
2009                            r, pct(r, read_tot), pct(read_cum, read_tot),
2010                            w, pct(w, write_tot), pct(write_cum, write_tot));
2011                 start = end;
2012                 if (start == (1 << 10)) {
2013                         start = 1;
2014                         units += 10;
2015                         unitp++;
2016                 }
2017                 if (read_cum == read_tot && write_cum == write_tot)
2018                         break;
2019         }
2020 }
2021
2022 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
2023 {
2024         struct ll_sb_info *sbi = seq->private;
2025         struct ll_rw_extents_info *rw_extents = sbi->ll_rw_extents_info;
2026         int k;
2027
2028         if (!sbi->ll_rw_stats_on || !rw_extents) {
2029                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
2030                 return 0;
2031         }
2032
2033         spin_lock(&sbi->ll_pp_extent_lock);
2034         lprocfs_stats_header(seq, ktime_get(), rw_extents->pp_init, 25, ":", 1);
2035         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
2036         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
2037                    "extents", "calls", "%", "cum%", "calls", "%", "cum%");
2038
2039         for (k = 0; k < LL_PROCESS_HIST_MAX; k++) {
2040                 if (rw_extents->pp_extents[k].pid != 0) {
2041                         seq_printf(seq, "\nPID: %d\n",
2042                                    rw_extents->pp_extents[k].pid);
2043                         ll_display_extents_info(rw_extents, seq, k);
2044                 }
2045         }
2046         spin_unlock(&sbi->ll_pp_extent_lock);
2047         return 0;
2048 }
2049
2050 static int alloc_rw_stats_info(struct ll_sb_info *sbi)
2051 {
2052         struct ll_rw_extents_info *rw_extents;
2053         struct ll_rw_process_info *offset;
2054         struct ll_rw_process_info *process;
2055         int i, rc = 0;
2056
2057         OBD_ALLOC(rw_extents, sizeof(*rw_extents));
2058         if (!rw_extents)
2059                 return -ENOMEM;
2060
2061         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
2062                 spin_lock_init(&rw_extents->pp_extents[i].pp_r_hist.oh_lock);
2063                 spin_lock_init(&rw_extents->pp_extents[i].pp_w_hist.oh_lock);
2064         }
2065
2066         spin_lock(&sbi->ll_pp_extent_lock);
2067         if (!sbi->ll_rw_extents_info)
2068                 sbi->ll_rw_extents_info = rw_extents;
2069         spin_unlock(&sbi->ll_pp_extent_lock);
2070         /* another writer allocated the struct before we got the lock */
2071         if (sbi->ll_rw_extents_info != rw_extents)
2072                 OBD_FREE(rw_extents, sizeof(*rw_extents));
2073
2074         OBD_ALLOC(process, sizeof(*process) * LL_PROCESS_HIST_MAX);
2075         if (!process)
2076                 GOTO(out, rc = -ENOMEM);
2077         OBD_ALLOC(offset, sizeof(*offset) * LL_OFFSET_HIST_MAX);
2078         if (!offset)
2079                 GOTO(out_free, rc = -ENOMEM);
2080
2081         spin_lock(&sbi->ll_process_lock);
2082         if (!sbi->ll_rw_process_info)
2083                 sbi->ll_rw_process_info = process;
2084         if (!sbi->ll_rw_offset_info)
2085                 sbi->ll_rw_offset_info = offset;
2086         spin_unlock(&sbi->ll_process_lock);
2087
2088         /* another writer allocated the structs before we got the lock */
2089         if (sbi->ll_rw_offset_info != offset)
2090                 OBD_FREE(offset, sizeof(*offset) * LL_OFFSET_HIST_MAX);
2091         if (sbi->ll_rw_process_info != process) {
2092 out_free:
2093                 OBD_FREE(process, sizeof(*process) * LL_PROCESS_HIST_MAX);
2094         }
2095
2096 out:
2097         return rc;
2098 }
2099
2100 void ll_free_rw_stats_info(struct ll_sb_info *sbi)
2101 {
2102         if (sbi->ll_rw_extents_info) {
2103                 OBD_FREE(sbi->ll_rw_extents_info,
2104                          sizeof(*sbi->ll_rw_extents_info));
2105                 sbi->ll_rw_extents_info = NULL;
2106         }
2107         if (sbi->ll_rw_offset_info) {
2108                 OBD_FREE(sbi->ll_rw_offset_info,
2109                          sizeof(*sbi->ll_rw_offset_info) * LL_OFFSET_HIST_MAX);
2110                 sbi->ll_rw_offset_info = NULL;
2111         }
2112         if (sbi->ll_rw_process_info) {
2113                 OBD_FREE(sbi->ll_rw_process_info,
2114                         sizeof(*sbi->ll_rw_process_info) * LL_PROCESS_HIST_MAX);
2115                 sbi->ll_rw_process_info = NULL;
2116         }
2117 }
2118
2119 static ssize_t ll_rw_extents_stats_pp_seq_write(struct file *file,
2120                                                 const char __user *buf,
2121                                                 size_t len, loff_t *off)
2122 {
2123         struct seq_file *seq = file->private_data;
2124         struct ll_sb_info *sbi = seq->private;
2125         struct ll_rw_extents_info *rw_extents;
2126         int i;
2127         __s64 value;
2128
2129         if (len == 0)
2130                 return -EINVAL;
2131
2132         value = ll_stats_pid_write(buf, len);
2133
2134         if (value == 0) {
2135                 sbi->ll_rw_stats_on = 0;
2136         } else {
2137                 if (!sbi->ll_rw_extents_info) {
2138                         int rc = alloc_rw_stats_info(sbi);
2139
2140                         if (rc)
2141                                 return rc;
2142                 }
2143                 sbi->ll_rw_stats_on = 1;
2144         }
2145
2146
2147         spin_lock(&sbi->ll_pp_extent_lock);
2148         rw_extents = sbi->ll_rw_extents_info;
2149         if (rw_extents) {
2150                 rw_extents->pp_init = ktime_get();
2151                 for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
2152                         rw_extents->pp_extents[i].pid = 0;
2153                         lprocfs_oh_clear(&rw_extents->pp_extents[i].pp_r_hist);
2154                         lprocfs_oh_clear(&rw_extents->pp_extents[i].pp_w_hist);
2155                 }
2156         }
2157         spin_unlock(&sbi->ll_pp_extent_lock);
2158
2159         return len;
2160 }
2161
2162 LDEBUGFS_SEQ_FOPS(ll_rw_extents_stats_pp);
2163
2164 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
2165 {
2166         struct ll_sb_info *sbi = seq->private;
2167         struct ll_rw_extents_info *rw_extents = sbi->ll_rw_extents_info;
2168
2169         if (!sbi->ll_rw_stats_on || !rw_extents) {
2170                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
2171                 return 0;
2172         }
2173
2174         spin_lock(&sbi->ll_lock);
2175         lprocfs_stats_header(seq, ktime_get(), rw_extents->pp_init, 25, ":", 1);
2176
2177         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
2178         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
2179                    "extents", "calls", "%", "cum%",
2180                    "calls", "%", "cum%");
2181
2182         ll_display_extents_info(rw_extents, seq, LL_PROCESS_HIST_MAX);
2183         spin_unlock(&sbi->ll_lock);
2184
2185         return 0;
2186 }
2187
2188 static ssize_t ll_rw_extents_stats_seq_write(struct file *file,
2189                                              const char __user *buf,
2190                                              size_t len, loff_t *off)
2191 {
2192         struct seq_file *seq = file->private_data;
2193         struct ll_sb_info *sbi = seq->private;
2194         struct ll_rw_extents_info *rw_extents;
2195         int i;
2196         __s64 value;
2197
2198         if (len == 0)
2199                 return -EINVAL;
2200
2201         value = ll_stats_pid_write(buf, len);
2202
2203         if (value == 0) {
2204                 sbi->ll_rw_stats_on = 0;
2205         } else {
2206                 if (!sbi->ll_rw_extents_info) {
2207                         int rc = alloc_rw_stats_info(sbi);
2208
2209                         if (rc)
2210                                 return rc;
2211                 }
2212                 sbi->ll_rw_stats_on = 1;
2213         }
2214
2215         spin_lock(&sbi->ll_pp_extent_lock);
2216         rw_extents = sbi->ll_rw_extents_info;
2217         if (rw_extents) {
2218                 rw_extents->pp_init = ktime_get();
2219                 for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
2220                         rw_extents->pp_extents[i].pid = 0;
2221                         lprocfs_oh_clear(&rw_extents->pp_extents[i].pp_r_hist);
2222                         lprocfs_oh_clear(&rw_extents->pp_extents[i].pp_w_hist);
2223                 }
2224         }
2225         spin_unlock(&sbi->ll_pp_extent_lock);
2226
2227         return len;
2228 }
2229
2230 LDEBUGFS_SEQ_FOPS(ll_rw_extents_stats);
2231
2232 void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
2233                        struct ll_file_data *file, loff_t pos,
2234                        size_t count, int rw)
2235 {
2236         int i, cur = -1;
2237         struct ll_rw_process_info *process;
2238         struct ll_rw_process_info *offset;
2239         int *off_count = &sbi->ll_rw_offset_entry_count;
2240         int *process_count = &sbi->ll_offset_process_count;
2241         struct ll_rw_extents_info *rw_extents;
2242
2243         if (!sbi->ll_rw_stats_on)
2244                 return;
2245
2246         spin_lock(&sbi->ll_pp_extent_lock);
2247         rw_extents = sbi->ll_rw_extents_info;
2248         if (!rw_extents) {
2249                 spin_unlock(&sbi->ll_pp_extent_lock);
2250                 return;
2251         }
2252
2253         /* Extent statistics */
2254         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
2255                 if (rw_extents->pp_extents[i].pid == pid) {
2256                         cur = i;
2257                         break;
2258                 }
2259         }
2260
2261         if (cur == -1) {
2262                 /* new process */
2263                 sbi->ll_extent_process_count =
2264                         (sbi->ll_extent_process_count + 1) % LL_PROCESS_HIST_MAX;
2265                 cur = sbi->ll_extent_process_count;
2266                 rw_extents->pp_extents[cur].pid = pid;
2267                 lprocfs_oh_clear(&rw_extents->pp_extents[cur].pp_r_hist);
2268                 lprocfs_oh_clear(&rw_extents->pp_extents[cur].pp_w_hist);
2269         }
2270
2271         for (i = 0; (count >= 1 << (LL_HIST_START + i)) &&
2272              (i < (LL_HIST_MAX - 1)); i++);
2273         if (rw == 0) {
2274                 rw_extents->pp_extents[cur].pp_r_hist.oh_buckets[i]++;
2275                 rw_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_r_hist.oh_buckets[i]++;
2276         } else {
2277                 rw_extents->pp_extents[cur].pp_w_hist.oh_buckets[i]++;
2278                 rw_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_w_hist.oh_buckets[i]++;
2279         }
2280         spin_unlock(&sbi->ll_pp_extent_lock);
2281
2282         spin_lock(&sbi->ll_process_lock);
2283         process = sbi->ll_rw_process_info;
2284         offset = sbi->ll_rw_offset_info;
2285         if (!process || !offset)
2286                 goto out_unlock;
2287
2288         /* Offset statistics */
2289         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
2290                 if (process[i].rw_pid == pid) {
2291                         if (process[i].rw_last_file != file) {
2292                                 process[i].rw_range_start = pos;
2293                                 process[i].rw_last_file_pos = pos + count;
2294                                 process[i].rw_smallest_extent = count;
2295                                 process[i].rw_largest_extent = count;
2296                                 process[i].rw_offset = 0;
2297                                 process[i].rw_last_file = file;
2298                                 goto out_unlock;
2299                         }
2300                         if (process[i].rw_last_file_pos != pos) {
2301                                 *off_count =
2302                                     (*off_count + 1) % LL_OFFSET_HIST_MAX;
2303                                 offset[*off_count].rw_op = process[i].rw_op;
2304                                 offset[*off_count].rw_pid = pid;
2305                                 offset[*off_count].rw_range_start =
2306                                         process[i].rw_range_start;
2307                                 offset[*off_count].rw_range_end =
2308                                         process[i].rw_last_file_pos;
2309                                 offset[*off_count].rw_smallest_extent =
2310                                         process[i].rw_smallest_extent;
2311                                 offset[*off_count].rw_largest_extent =
2312                                         process[i].rw_largest_extent;
2313                                 offset[*off_count].rw_offset =
2314                                         process[i].rw_offset;
2315                                 process[i].rw_op = rw;
2316                                 process[i].rw_range_start = pos;
2317                                 process[i].rw_smallest_extent = count;
2318                                 process[i].rw_largest_extent = count;
2319                                 process[i].rw_offset = pos -
2320                                         process[i].rw_last_file_pos;
2321                         }
2322                         if (process[i].rw_smallest_extent > count)
2323                                 process[i].rw_smallest_extent = count;
2324                         if (process[i].rw_largest_extent < count)
2325                                 process[i].rw_largest_extent = count;
2326                         process[i].rw_last_file_pos = pos + count;
2327                         goto out_unlock;
2328                 }
2329         }
2330         *process_count = (*process_count + 1) % LL_PROCESS_HIST_MAX;
2331         process[*process_count].rw_pid = pid;
2332         process[*process_count].rw_op = rw;
2333         process[*process_count].rw_range_start = pos;
2334         process[*process_count].rw_last_file_pos = pos + count;
2335         process[*process_count].rw_smallest_extent = count;
2336         process[*process_count].rw_largest_extent = count;
2337         process[*process_count].rw_offset = 0;
2338         process[*process_count].rw_last_file = file;
2339
2340 out_unlock:
2341         spin_unlock(&sbi->ll_process_lock);
2342 }
2343
2344 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
2345 {
2346         struct ll_sb_info *sbi = seq->private;
2347         struct ll_rw_process_info *offset;
2348         struct ll_rw_process_info *process;
2349         int i;
2350
2351         if (!sbi->ll_rw_stats_on) {
2352                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
2353                 return 0;
2354         }
2355
2356         spin_lock(&sbi->ll_process_lock);
2357         lprocfs_stats_header(seq, ktime_get(), sbi->ll_process_stats_init, 25,
2358                              ":", true);
2359         seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
2360                    "R/W", "PID", "RANGE START", "RANGE END",
2361                    "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");
2362
2363         /* We stored the discontiguous offsets here; print them first */
2364         offset = sbi->ll_rw_offset_info;
2365         for (i = 0; offset && i < LL_OFFSET_HIST_MAX; i++) {
2366                 if (offset[i].rw_pid != 0)
2367                         seq_printf(seq,
2368                                   "%3c %10d %14llu %14llu %17lu %17lu %14lld\n",
2369                                    offset[i].rw_op == READ ? 'R' : 'W',
2370                                    offset[i].rw_pid,
2371                                    offset[i].rw_range_start,
2372                                    offset[i].rw_range_end,
2373                                    (unsigned long)offset[i].rw_smallest_extent,
2374                                    (unsigned long)offset[i].rw_largest_extent,
2375                                    offset[i].rw_offset);
2376         }
2377
2378         /* Then print the current offsets for each process */
2379         process = sbi->ll_rw_process_info;
2380         for (i = 0; process && i < LL_PROCESS_HIST_MAX; i++) {
2381                 if (process[i].rw_pid != 0)
2382                         seq_printf(seq,
2383                                   "%3c %10d %14llu %14llu %17lu %17lu %14lld\n",
2384                                    process[i].rw_op == READ ? 'R' : 'W',
2385                                    process[i].rw_pid,
2386                                    process[i].rw_range_start,
2387                                    process[i].rw_last_file_pos,
2388                                    (unsigned long)process[i].rw_smallest_extent,
2389                                    (unsigned long)process[i].rw_largest_extent,
2390                                    process[i].rw_offset);
2391         }
2392         spin_unlock(&sbi->ll_process_lock);
2393
2394         return 0;
2395 }
2396
2397 static ssize_t ll_rw_offset_stats_seq_write(struct file *file,
2398                                             const char __user *buf,
2399                                             size_t len, loff_t *off)
2400 {
2401         struct seq_file *seq = file->private_data;
2402         struct ll_sb_info *sbi = seq->private;
2403         __s64 value;
2404
2405         if (len == 0)
2406                 return -EINVAL;
2407
2408         value = ll_stats_pid_write(buf, len);
2409
2410         if (value == 0) {
2411                 sbi->ll_rw_stats_on = 0;
2412         } else {
2413                 if (!sbi->ll_rw_process_info || !sbi->ll_rw_offset_info) {
2414                         int rc = alloc_rw_stats_info(sbi);
2415
2416                         if (rc)
2417                                 return rc;
2418                 }
2419                 sbi->ll_rw_stats_on = 1;
2420         }
2421
2422         spin_lock(&sbi->ll_process_lock);
2423         sbi->ll_offset_process_count = 0;
2424         sbi->ll_rw_offset_entry_count = 0;
2425         sbi->ll_process_stats_init = ktime_get();
2426         if (sbi->ll_rw_process_info)
2427                 memset(sbi->ll_rw_process_info, 0,
2428                        sizeof(struct ll_rw_process_info) * LL_PROCESS_HIST_MAX);
2429         if (sbi->ll_rw_offset_info)
2430                 memset(sbi->ll_rw_offset_info, 0,
2431                        sizeof(struct ll_rw_process_info) * LL_OFFSET_HIST_MAX);
2432         spin_unlock(&sbi->ll_process_lock);
2433
2434         return len;
2435 }
2436
2437 LDEBUGFS_SEQ_FOPS(ll_rw_offset_stats);