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 "lprocfs_status.h"
  43 #include "vvp_internal.h"
  44
  45 static struct kobject *llite_kobj;
  46 static struct dentry *llite_root;
  47
  48 static void llite_kobj_release(struct kobject *kobj)
  49 {
  50         if (!IS_ERR_OR_NULL(llite_root)) {
  51                 debugfs_remove(llite_root);
  52                 llite_root = NULL;
  53         }
  54
  55         kfree(kobj);
  56 }
  57
  58 static struct kobj_type llite_kobj_ktype = {
  59         .release        = llite_kobj_release,
  60         .sysfs_ops      = &lustre_sysfs_ops,
  61 };
  62
  63 int llite_tunables_register(void)
  64 {
  65         int rc;
  66
  67         llite_kobj = kzalloc(sizeof(*llite_kobj), GFP_KERNEL);
  68         if (!llite_kobj)
  69                 return -ENOMEM;
  70
  71         llite_kobj->kset = lustre_kset;
  72         rc = kobject_init_and_add(llite_kobj, &llite_kobj_ktype,
  73                                   &lustre_kset->kobj, "%s", "llite");
  74         if (rc)
  75                 goto free_kobj;
  76
  77         llite_root = debugfs_create_dir("llite", debugfs_lustre_root);
  78         return 0;
  79
  80 free_kobj:
  81         kobject_put(llite_kobj);
  82         llite_kobj = NULL;
  83
  84         return rc;
  85 }
  86
  87 void llite_tunables_unregister(void)
  88 {
  89         kobject_put(llite_kobj);
  90         llite_kobj = NULL;
  91 }
  92
  93 /* <debugfs>/lustre/llite mount point registration */
  94 static const struct file_operations ll_rw_extents_stats_fops;
  95 static const struct file_operations ll_rw_extents_stats_pp_fops;
  96 static const struct file_operations ll_rw_offset_stats_fops;
  97
  98 /**
  99  * ll_stats_pid_write() - Determine if stats collection should be enabled
 100  * @buf: Buffer containing the data written
 101  * @len: Number of bytes in the buffer
 102  *
 103  * Several proc files begin collecting stats when a value is written, and stop
 104  * collecting when either '0' or 'disable' is written. This function checks the
 105  * written value to see if collection should be enabled or disabled.
 106  *
 107  * Return: If '0' or 'disable' is provided, 0 is returned. If the text
 108  * equivalent of a number is written, that number is returned. Otherwise,
 109  * 1 is returned. Non-zero return values indicate collection should be enabled.
 110  */
 111 static s64 ll_stats_pid_write(const char __user *buf, size_t len)
 112 {
 113         unsigned long long value = 1;
 114         char kernbuf[16];
 115         int rc;
 116
 117         rc = kstrtoull_from_user(buf, len, 0, &value);
 118         if (rc < 0 && len < sizeof(kernbuf)) {
 119                 if (copy_from_user(kernbuf, buf, len))
 120                         return -EFAULT;
 121                 kernbuf[len] = 0;
 122
 123                 if (kernbuf[len - 1] == '\n')
 124                         kernbuf[len - 1] = 0;
 125
 126                 if (strncasecmp(kernbuf, "disable", 7) == 0)
 127                         value = 0;
 128         }
 129
 130         return value;
 131 }
 132
 133 static ssize_t blocksize_show(struct kobject *kobj, struct attribute *attr,
 134                               char *buf)
 135 {
 136         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 137                                               ll_kset.kobj);
 138         struct obd_statfs osfs;
 139         int rc;
 140
 141         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 142         if (rc)
 143                 return rc;
 144
 145         return sprintf(buf, "%u\n", osfs.os_bsize);
 146 }
 147 LUSTRE_RO_ATTR(blocksize);
 148
 149 static ssize_t stat_blocksize_show(struct kobject *kobj, struct attribute *attr,
 150                                    char *buf)
 151 {
 152         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 153                                               ll_kset.kobj);
 154
 155         return sprintf(buf, "%u\n", sbi->ll_stat_blksize);
 156 }
 157
 158 static ssize_t stat_blocksize_store(struct kobject *kobj,
 159                                     struct attribute *attr,
 160                                     const char *buffer,
 161                                     size_t count)
 162 {
 163         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 164                                               ll_kset.kobj);
 165         unsigned int val;
 166         int rc;
 167
 168         rc = kstrtouint(buffer, 10, &val);
 169         if (rc)
 170                 return rc;
 171
 172         if (val != 0 && (val < PAGE_SIZE || (val & (val - 1))) != 0)
 173                 return -ERANGE;
 174
 175         sbi->ll_stat_blksize = val;
 176
 177         return count;
 178 }
 179 LUSTRE_RW_ATTR(stat_blocksize);
 180
 181 static ssize_t kbytestotal_show(struct kobject *kobj, struct attribute *attr,
 182                                 char *buf)
 183 {
 184         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 185                                               ll_kset.kobj);
 186         struct obd_statfs osfs;
 187         u32 blk_size;
 188         u64 result;
 189         int rc;
 190
 191         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 192         if (rc)
 193                 return rc;
 194
 195         blk_size = osfs.os_bsize >> 10;
 196         result = osfs.os_blocks;
 197
 198         while (blk_size >>= 1)
 199                 result <<= 1;
 200
 201         return sprintf(buf, "%llu\n", result);
 202 }
 203 LUSTRE_RO_ATTR(kbytestotal);
 204
 205 static ssize_t kbytesfree_show(struct kobject *kobj, struct attribute *attr,
 206                                char *buf)
 207 {
 208         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 209                                               ll_kset.kobj);
 210         struct obd_statfs osfs;
 211         u32 blk_size;
 212         u64 result;
 213         int rc;
 214
 215         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 216         if (rc)
 217                 return rc;
 218
 219         blk_size = osfs.os_bsize >> 10;
 220         result = osfs.os_bfree;
 221
 222         while (blk_size >>= 1)
 223                 result <<= 1;
 224
 225         return sprintf(buf, "%llu\n", result);
 226 }
 227 LUSTRE_RO_ATTR(kbytesfree);
 228
 229 static ssize_t kbytesavail_show(struct kobject *kobj, struct attribute *attr,
 230                                 char *buf)
 231 {
 232         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 233                                               ll_kset.kobj);
 234         struct obd_statfs osfs;
 235         u32 blk_size;
 236         u64 result;
 237         int rc;
 238
 239         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 240         if (rc)
 241                 return rc;
 242
 243         blk_size = osfs.os_bsize >> 10;
 244         result = osfs.os_bavail;
 245
 246         while (blk_size >>= 1)
 247                 result <<= 1;
 248
 249         return sprintf(buf, "%llu\n", result);
 250 }
 251 LUSTRE_RO_ATTR(kbytesavail);
 252
 253 static ssize_t filestotal_show(struct kobject *kobj, struct attribute *attr,
 254                                char *buf)
 255 {
 256         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 257                                               ll_kset.kobj);
 258         struct obd_statfs osfs;
 259         int rc;
 260
 261         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 262         if (rc)
 263                 return rc;
 264
 265         return sprintf(buf, "%llu\n", osfs.os_files);
 266 }
 267 LUSTRE_RO_ATTR(filestotal);
 268
 269 static ssize_t filesfree_show(struct kobject *kobj, struct attribute *attr,
 270                               char *buf)
 271 {
 272         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 273                                               ll_kset.kobj);
 274         struct obd_statfs osfs;
 275         int rc;
 276
 277         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 278         if (rc)
 279                 return rc;
 280
 281         return sprintf(buf, "%llu\n", osfs.os_ffree);
 282 }
 283 LUSTRE_RO_ATTR(filesfree);
 284
 285 static ssize_t client_type_show(struct kobject *kobj, struct attribute *attr,
 286                                 char *buf)
 287 {
 288         return sprintf(buf, "local client\n");
 289 }
 290 LUSTRE_RO_ATTR(client_type);
 291
 292 LUSTRE_RW_ATTR(foreign_symlink_enable);
 293
 294 LUSTRE_RW_ATTR(foreign_symlink_prefix);
 295
 296 LUSTRE_RW_ATTR(foreign_symlink_upcall);
 297
 298 LUSTRE_WO_ATTR(foreign_symlink_upcall_info);
 299
 300 static ssize_t fstype_show(struct kobject *kobj, struct attribute *attr,
 301                            char *buf)
 302 {
 303         return sprintf(buf, "lustre\n");
 304 }
 305 LUSTRE_RO_ATTR(fstype);
 306
 307 static ssize_t uuid_show(struct kobject *kobj, struct attribute *attr,
 308                          char *buf)
 309 {
 310         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 311                                               ll_kset.kobj);
 312
 313         return sprintf(buf, "%s\n", sbi->ll_sb_uuid.uuid);
 314 }
 315 LUSTRE_RO_ATTR(uuid);
 316
 317 static int ll_site_stats_seq_show(struct seq_file *m, void *v)
 318 {
 319         struct super_block *sb = m->private;
 320
 321         /*
 322          * See description of statistical counters in struct cl_site, and
 323          * struct lu_site.
 324          */
 325         return cl_site_stats_print(lu2cl_site(ll_s2sbi(sb)->ll_site), m);
 326 }
 327
 328 LDEBUGFS_SEQ_FOPS_RO(ll_site_stats);
 329
 330 static ssize_t max_read_ahead_mb_show(struct kobject *kobj,
 331                                       struct attribute *attr, char *buf)
 332 {
 333         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 334                                               ll_kset.kobj);
 335
 336         return scnprintf(buf, PAGE_SIZE, "%lu\n",
 337                         PAGES_TO_MiB(sbi->ll_ra_info.ra_max_pages));
 338 }
 339
 340 static ssize_t max_read_ahead_mb_store(struct kobject *kobj,
 341                                        struct attribute *attr,
 342                                        const char *buffer, size_t count)
 343 {
 344         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 345                                               ll_kset.kobj);
 346         u64 ra_max_mb, pages_number;
 347         int rc;
 348
 349         rc = sysfs_memparse(buffer, count, &ra_max_mb, "MiB");
 350         if (rc)
 351                 return rc;
 352
 353         pages_number = round_up(ra_max_mb, 1024 * 1024) >> PAGE_SHIFT;
 354         CDEBUG(D_INFO, "%s: set max_read_ahead_mb=%llu (%llu pages)\n",
 355                sbi->ll_fsname, PAGES_TO_MiB(pages_number), pages_number);
 356         if (pages_number > cfs_totalram_pages() / 2) {
 357                 /* 1/2 of RAM */
 358                 CERROR("%s: cannot set max_read_ahead_mb=%llu > totalram/2=%luMB\n",
 359                        sbi->ll_fsname, PAGES_TO_MiB(pages_number),
 360                        PAGES_TO_MiB(cfs_totalram_pages() / 2));
 361                 return -ERANGE;
 362         }
 363
 364         spin_lock(&sbi->ll_lock);
 365         sbi->ll_ra_info.ra_max_pages = pages_number;
 366         spin_unlock(&sbi->ll_lock);
 367
 368         return count;
 369 }
 370 LUSTRE_RW_ATTR(max_read_ahead_mb);
 371
 372 static ssize_t max_read_ahead_per_file_mb_show(struct kobject *kobj,
 373                                                struct attribute *attr,
 374                                                char *buf)
 375 {
 376         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 377                                               ll_kset.kobj);
 378
 379         return scnprintf(buf, PAGE_SIZE, "%lu\n",
 380                          PAGES_TO_MiB(sbi->ll_ra_info.ra_max_pages_per_file));
 381 }
 382
 383 static ssize_t max_read_ahead_per_file_mb_store(struct kobject *kobj,
 384                                                 struct attribute *attr,
 385                                                 const char *buffer,
 386                                                 size_t count)
 387 {
 388         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 389                                               ll_kset.kobj);
 390         u64 ra_max_file_mb, pages_number;
 391         int rc;
 392
 393         rc = sysfs_memparse(buffer, count, &ra_max_file_mb, "MiB");
 394         if (rc)
 395                 return rc;
 396
 397         pages_number = round_up(ra_max_file_mb, 1024 * 1024) >> PAGE_SHIFT;
 398         if (pages_number > sbi->ll_ra_info.ra_max_pages) {
 399                 CERROR("%s: cannot set max_read_ahead_per_file_mb=%llu > max_read_ahead_mb=%lu\n",
 400                        sbi->ll_fsname, PAGES_TO_MiB(pages_number),
 401                        PAGES_TO_MiB(sbi->ll_ra_info.ra_max_pages));
 402                 return -ERANGE;
 403         }
 404
 405         spin_lock(&sbi->ll_lock);
 406         sbi->ll_ra_info.ra_max_pages_per_file = pages_number;
 407         spin_unlock(&sbi->ll_lock);
 408
 409         return count;
 410 }
 411 LUSTRE_RW_ATTR(max_read_ahead_per_file_mb);
 412
 413 static ssize_t max_read_ahead_whole_mb_show(struct kobject *kobj,
 414                                             struct attribute *attr, char *buf)
 415 {
 416         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 417                                               ll_kset.kobj);
 418
 419         return scnprintf(buf, PAGE_SIZE, "%lu\n",
 420                          PAGES_TO_MiB(sbi->ll_ra_info.ra_max_read_ahead_whole_pages));
 421 }
 422
 423 static ssize_t max_read_ahead_whole_mb_store(struct kobject *kobj,
 424                                              struct attribute *attr,
 425                                              const char *buffer, size_t count)
 426 {
 427         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 428                                               ll_kset.kobj);
 429         u64 ra_max_whole_mb, pages_number;
 430         int rc;
 431
 432         rc = sysfs_memparse(buffer, count, &ra_max_whole_mb, "MiB");
 433         if (rc)
 434                 return rc;
 435
 436         pages_number = round_up(ra_max_whole_mb, 1024 * 1024) >> PAGE_SHIFT;
 437         /* Cap this at the current max readahead window size, the readahead
 438          * algorithm does this anyway so it's pointless to set it larger.
 439          */
 440         if (pages_number > sbi->ll_ra_info.ra_max_pages_per_file) {
 441                 CERROR("%s: cannot set max_read_ahead_whole_mb=%llu > max_read_ahead_per_file_mb=%lu\n",
 442                        sbi->ll_fsname, PAGES_TO_MiB(pages_number),
 443                        PAGES_TO_MiB(sbi->ll_ra_info.ra_max_pages_per_file));
 444
 445                 return -ERANGE;
 446         }
 447
 448         spin_lock(&sbi->ll_lock);
 449         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = pages_number;
 450         spin_unlock(&sbi->ll_lock);
 451
 452         return count;
 453 }
 454 LUSTRE_RW_ATTR(max_read_ahead_whole_mb);
 455
 456 static int ll_max_cached_mb_seq_show(struct seq_file *m, void *v)
 457 {
 458         struct super_block     *sb    = m->private;
 459         struct ll_sb_info      *sbi   = ll_s2sbi(sb);
 460         struct cl_client_cache *cache = sbi->ll_cache;
 461         struct ll_ra_info *ra = &sbi->ll_ra_info;
 462         long max_cached_mb;
 463         long unused_mb;
 464
 465         mutex_lock(&cache->ccc_max_cache_mb_lock);
 466         max_cached_mb = PAGES_TO_MiB(cache->ccc_lru_max);
 467         unused_mb = PAGES_TO_MiB(atomic_long_read(&cache->ccc_lru_left));
 468         mutex_unlock(&cache->ccc_max_cache_mb_lock);
 469
 470         seq_printf(m, "users: %d\n"
 471                       "max_cached_mb: %ld\n"
 472                       "used_mb: %ld\n"
 473                       "unused_mb: %ld\n"
 474                       "reclaim_count: %u\n"
 475                       "max_read_ahead_mb: %lu\n"
 476                       "used_read_ahead_mb: %d\n",
 477                    atomic_read(&cache->ccc_users),
 478                    max_cached_mb,
 479                    max_cached_mb - unused_mb,
 480                    unused_mb,
 481                    cache->ccc_lru_shrinkers,
 482                    PAGES_TO_MiB(ra->ra_max_pages),
 483                    PAGES_TO_MiB(atomic_read(&ra->ra_cur_pages)));
 484         return 0;
 485 }
 486
 487 static ssize_t ll_max_cached_mb_seq_write(struct file *file,
 488                                           const char __user *buffer,
 489                                           size_t count, loff_t *off)
 490 {
 491         struct seq_file *m = file->private_data;
 492         struct super_block *sb = m->private;
 493         struct ll_sb_info *sbi = ll_s2sbi(sb);
 494         struct cl_client_cache *cache = sbi->ll_cache;
 495         struct lu_env *env;
 496         long diff = 0;
 497         long nrpages = 0;
 498         __u16 refcheck;
 499         u64 pages_number;
 500         int rc;
 501         char kernbuf[128], *ptr;
 502
 503         ENTRY;
 504         if (count >= sizeof(kernbuf))
 505                 RETURN(-EINVAL);
 506
 507         if (copy_from_user(kernbuf, buffer, count))
 508                 RETURN(-EFAULT);
 509         kernbuf[count] = '\0';
 510
 511         ptr = lprocfs_find_named_value(kernbuf, "max_cached_mb:", &count);
 512         rc = sysfs_memparse(ptr, count, &pages_number, "MiB");
 513         if (rc)
 514                 RETURN(rc);
 515
 516         pages_number >>= PAGE_SHIFT;
 517
 518         if (pages_number < 0 || pages_number > cfs_totalram_pages()) {
 519                 CERROR("%s: can't set max cache more than %lu MB\n",
 520                        sbi->ll_fsname,
 521                        PAGES_TO_MiB(cfs_totalram_pages()));
 522                 RETURN(-ERANGE);
 523         }
 524         /* Allow enough cache so clients can make well-formed RPCs */
 525         pages_number = max_t(long, pages_number, PTLRPC_MAX_BRW_PAGES);
 526
 527         mutex_lock(&cache->ccc_max_cache_mb_lock);
 528         diff = pages_number - cache->ccc_lru_max;
 529
 530         /* easy - add more LRU slots. */
 531         if (diff >= 0) {
 532                 atomic_long_add(diff, &cache->ccc_lru_left);
 533                 GOTO(out, rc = 0);
 534         }
 535
 536         env = cl_env_get(&refcheck);
 537         if (IS_ERR(env))
 538                 GOTO(out_unlock, rc = PTR_ERR(env));
 539
 540         diff = -diff;
 541         while (diff > 0) {
 542                 long tmp;
 543
 544                 /* reduce LRU budget from free slots. */
 545                 do {
 546                         long lru_left_old, lru_left_new, lru_left_ret;
 547
 548                         lru_left_old = atomic_long_read(&cache->ccc_lru_left);
 549                         if (lru_left_old == 0)
 550                                 break;
 551
 552                         lru_left_new = lru_left_old > diff ?
 553                                         lru_left_old - diff : 0;
 554                         lru_left_ret =
 555                                 atomic_long_cmpxchg(&cache->ccc_lru_left,
 556                                                     lru_left_old,
 557                                                     lru_left_new);
 558                         if (likely(lru_left_old == lru_left_ret)) {
 559                                 diff -= lru_left_old - lru_left_new;
 560                                 nrpages += lru_left_old - lru_left_new;
 561                                 break;
 562                         }
 563                 } while (1);
 564
 565                 if (diff <= 0)
 566                         break;
 567
 568                 if (sbi->ll_dt_exp == NULL) { /* being initialized */
 569                         rc = -ENODEV;
 570                         break;
 571                 }
 572
 573                 /* Request extra free slots to avoid them all being used
 574                  * by other processes before this can continue shrinking.
 575                  */
 576                 tmp = diff + min_t(long, diff, MiB_TO_PAGES(1024));
 577                 /* difficult - have to ask OSCs to drop LRU slots. */
 578                 rc = obd_set_info_async(env, sbi->ll_dt_exp,
 579                                 sizeof(KEY_CACHE_LRU_SHRINK),
 580                                 KEY_CACHE_LRU_SHRINK,
 581                                 sizeof(tmp), &tmp, NULL);
 582                 if (rc < 0)
 583                         break;
 584         }
 585         cl_env_put(env, &refcheck);
 586
 587 out:
 588         if (rc >= 0) {
 589                 cache->ccc_lru_max = pages_number;
 590                 rc = count;
 591         } else {
 592                 atomic_long_add(nrpages, &cache->ccc_lru_left);
 593         }
 594 out_unlock:
 595         mutex_unlock(&cache->ccc_max_cache_mb_lock);
 596         return rc;
 597 }
 598 LDEBUGFS_SEQ_FOPS(ll_max_cached_mb);
 599
 600 static ssize_t checksums_show(struct kobject *kobj, struct attribute *attr,
 601                               char *buf)
 602 {
 603         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 604                                               ll_kset.kobj);
 605
 606         return scnprintf(buf, PAGE_SIZE, "%u\n",
 607                          test_bit(LL_SBI_CHECKSUM, sbi->ll_flags));
 608 }
 609
 610 static ssize_t checksums_store(struct kobject *kobj, struct attribute *attr,
 611                                const char *buffer, size_t count)
 612 {
 613         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 614                                               ll_kset.kobj);
 615         bool val;
 616         int tmp;
 617         int rc;
 618
 619         if (!sbi->ll_dt_exp)
 620                 /* Not set up yet */
 621                 return -EAGAIN;
 622
 623         rc = kstrtobool(buffer, &val);
 624         if (rc)
 625                 return rc;
 626         if (val)
 627                 set_bit(LL_SBI_CHECKSUM, sbi->ll_flags);
 628         else
 629                 clear_bit(LL_SBI_CHECKSUM, sbi->ll_flags);
 630         tmp = val;
 631
 632         rc = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 633                                 KEY_CHECKSUM, sizeof(tmp), &tmp, NULL);
 634         if (rc)
 635                 CWARN("Failed to set OSC checksum flags: %d\n", rc);
 636
 637         return count;
 638 }
 639 LUSTRE_RW_ATTR(checksums);
 640
 641 LUSTRE_ATTR(checksum_pages, 0644, checksums_show, checksums_store);
 642
 643 static ssize_t ll_rd_track_id(struct kobject *kobj, char *buf,
 644                               enum stats_track_type type)
 645 {
 646         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 647                                               ll_kset.kobj);
 648
 649         if (sbi->ll_stats_track_type == type)
 650                 return sprintf(buf, "%d\n", sbi->ll_stats_track_id);
 651         else if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
 652                 return sprintf(buf, "0 (all)\n");
 653
 654         return sprintf(buf, "untracked\n");
 655 }
 656
 657 static ssize_t ll_wr_track_id(struct kobject *kobj, const char *buffer,
 658                               size_t count, enum stats_track_type type)
 659 {
 660         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 661                                               ll_kset.kobj);
 662         unsigned long pid;
 663         int rc;
 664
 665         rc = kstrtoul(buffer, 10, &pid);
 666         if (rc)
 667                 return rc;
 668
 669         sbi->ll_stats_track_id = pid;
 670         if (pid == 0)
 671                 sbi->ll_stats_track_type = STATS_TRACK_ALL;
 672         else
 673                 sbi->ll_stats_track_type = type;
 674         lprocfs_clear_stats(sbi->ll_stats);
 675         return count;
 676 }
 677
 678 static ssize_t stats_track_pid_show(struct kobject *kobj,
 679                                     struct attribute *attr,
 680                                     char *buf)
 681 {
 682         return ll_rd_track_id(kobj, buf, STATS_TRACK_PID);
 683 }
 684
 685 static ssize_t stats_track_pid_store(struct kobject *kobj,
 686                                      struct attribute *attr,
 687                                      const char *buffer,
 688                                      size_t count)
 689 {
 690         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_PID);
 691 }
 692 LUSTRE_RW_ATTR(stats_track_pid);
 693
 694 static ssize_t stats_track_ppid_show(struct kobject *kobj,
 695                                      struct attribute *attr,
 696                                      char *buf)
 697 {
 698         return ll_rd_track_id(kobj, buf, STATS_TRACK_PPID);
 699 }
 700
 701 static ssize_t stats_track_ppid_store(struct kobject *kobj,
 702                                       struct attribute *attr,
 703                                       const char *buffer,
 704                                       size_t count)
 705 {
 706         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_PPID);
 707 }
 708 LUSTRE_RW_ATTR(stats_track_ppid);
 709
 710 static ssize_t stats_track_gid_show(struct kobject *kobj,
 711                                     struct attribute *attr,
 712                                     char *buf)
 713 {
 714         return ll_rd_track_id(kobj, buf, STATS_TRACK_GID);
 715 }
 716
 717 static ssize_t stats_track_gid_store(struct kobject *kobj,
 718                                      struct attribute *attr,
 719                                      const char *buffer,
 720                                      size_t count)
 721 {
 722         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_GID);
 723 }
 724 LUSTRE_RW_ATTR(stats_track_gid);
 725
 726 static ssize_t statahead_running_max_show(struct kobject *kobj,
 727                                           struct attribute *attr,
 728                                           char *buf)
 729 {
 730         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 731                                               ll_kset.kobj);
 732
 733         return scnprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_sa_running_max);
 734 }
 735
 736 static ssize_t statahead_running_max_store(struct kobject *kobj,
 737                                            struct attribute *attr,
 738                                            const char *buffer,
 739                                            size_t count)
 740 {
 741         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 742                                               ll_kset.kobj);
 743         unsigned long val;
 744         int rc;
 745
 746         rc = kstrtoul(buffer, 0, &val);
 747         if (rc)
 748                 return rc;
 749
 750         if (val <= LL_SA_RUNNING_MAX) {
 751                 sbi->ll_sa_running_max = val;
 752                 return count;
 753         }
 754
 755         CERROR("Bad statahead_running_max value %lu. Valid values "
 756                "are in the range [0, %d]\n", val, LL_SA_RUNNING_MAX);
 757
 758         return -ERANGE;
 759 }
 760 LUSTRE_RW_ATTR(statahead_running_max);
 761
 762 static ssize_t statahead_max_show(struct kobject *kobj,
 763                                   struct attribute *attr,
 764                                   char *buf)
 765 {
 766         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 767                                               ll_kset.kobj);
 768
 769         return sprintf(buf, "%u\n", sbi->ll_sa_max);
 770 }
 771
 772 static ssize_t statahead_max_store(struct kobject *kobj,
 773                                    struct attribute *attr,
 774                                    const char *buffer,
 775                                    size_t count)
 776 {
 777         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 778                                               ll_kset.kobj);
 779         unsigned long val;
 780         int rc;
 781
 782         rc = kstrtoul(buffer, 0, &val);
 783         if (rc)
 784                 return rc;
 785
 786         if (val <= LL_SA_RPC_MAX)
 787                 sbi->ll_sa_max = val;
 788         else
 789                 CERROR("Bad statahead_max value %lu. Valid values are in the range [0, %d]\n",
 790                        val, LL_SA_RPC_MAX);
 791
 792         return count;
 793 }
 794 LUSTRE_RW_ATTR(statahead_max);
 795
 796 static ssize_t statahead_agl_show(struct kobject *kobj,
 797                                   struct attribute *attr,
 798                                   char *buf)
 799 {
 800         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 801                                               ll_kset.kobj);
 802
 803         return scnprintf(buf, PAGE_SIZE, "%u\n",
 804                          test_bit(LL_SBI_AGL_ENABLED, sbi->ll_flags));
 805 }
 806
 807 static ssize_t statahead_agl_store(struct kobject *kobj,
 808                                    struct attribute *attr,
 809                                    const char *buffer,
 810                                    size_t count)
 811 {
 812         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 813                                               ll_kset.kobj);
 814         bool val;
 815         int rc;
 816
 817         rc = kstrtobool(buffer, &val);
 818         if (rc)
 819                 return rc;
 820
 821         if (val)
 822                 set_bit(LL_SBI_AGL_ENABLED, sbi->ll_flags);
 823         else
 824                 clear_bit(LL_SBI_AGL_ENABLED, sbi->ll_flags);
 825
 826         return count;
 827 }
 828 LUSTRE_RW_ATTR(statahead_agl);
 829
 830 static int ll_statahead_stats_seq_show(struct seq_file *m, void *v)
 831 {
 832         struct super_block *sb = m->private;
 833         struct ll_sb_info *sbi = ll_s2sbi(sb);
 834
 835         seq_printf(m, "statahead total: %u\n"
 836                       "statahead wrong: %u\n"
 837                       "agl total: %u\n"
 838                       "hit_total: %u\n"
 839                       "miss_total: %u\n",
 840                    atomic_read(&sbi->ll_sa_total),
 841                    atomic_read(&sbi->ll_sa_wrong),
 842                    atomic_read(&sbi->ll_agl_total),
 843                    atomic_read(&sbi->ll_sa_hit_total),
 844                    atomic_read(&sbi->ll_sa_miss_total));
 845         return 0;
 846 }
 847
 848 static ssize_t ll_statahead_stats_seq_write(struct file *file,
 849                                             const char __user *buffer,
 850                                             size_t count, loff_t *off)
 851 {
 852         struct seq_file *m = file->private_data;
 853         struct super_block *sb = m->private;
 854         struct ll_sb_info *sbi = ll_s2sbi(sb);
 855
 856         atomic_set(&sbi->ll_sa_total, 0);
 857         atomic_set(&sbi->ll_sa_wrong, 0);
 858         atomic_set(&sbi->ll_agl_total, 0);
 859         atomic_set(&sbi->ll_sa_hit_total, 0);
 860         atomic_set(&sbi->ll_sa_miss_total, 0);
 861
 862         return count;
 863 }
 864 LDEBUGFS_SEQ_FOPS(ll_statahead_stats);
 865
 866 static ssize_t lazystatfs_show(struct kobject *kobj,
 867                                struct attribute *attr,
 868                                char *buf)
 869 {
 870         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 871                                               ll_kset.kobj);
 872
 873         return scnprintf(buf, PAGE_SIZE, "%u\n",
 874                          test_bit(LL_SBI_LAZYSTATFS, sbi->ll_flags));
 875 }
 876
 877 static ssize_t lazystatfs_store(struct kobject *kobj,
 878                                 struct attribute *attr,
 879                                 const char *buffer,
 880                                 size_t count)
 881 {
 882         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 883                                               ll_kset.kobj);
 884         bool val;
 885         int rc;
 886
 887         rc = kstrtobool(buffer, &val);
 888         if (rc)
 889                 return rc;
 890
 891         if (val)
 892                 set_bit(LL_SBI_LAZYSTATFS, sbi->ll_flags);
 893         else
 894                 clear_bit(LL_SBI_LAZYSTATFS, sbi->ll_flags);
 895
 896         return count;
 897 }
 898 LUSTRE_RW_ATTR(lazystatfs);
 899
 900 static ssize_t statfs_max_age_show(struct kobject *kobj, struct attribute *attr,
 901                                    char *buf)
 902 {
 903         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 904                                               ll_kset.kobj);
 905
 906         return scnprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_statfs_max_age);
 907 }
 908
 909 static ssize_t statfs_max_age_store(struct kobject *kobj,
 910                                     struct attribute *attr, const char *buffer,
 911                                     size_t count)
 912 {
 913         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 914                                               ll_kset.kobj);
 915         unsigned int val;
 916         int rc;
 917
 918         rc = kstrtouint(buffer, 10, &val);
 919         if (rc)
 920                 return rc;
 921         if (val > OBD_STATFS_CACHE_MAX_AGE)
 922                 return -EINVAL;
 923
 924         sbi->ll_statfs_max_age = val;
 925
 926         return count;
 927 }
 928 LUSTRE_RW_ATTR(statfs_max_age);
 929
 930 static ssize_t max_easize_show(struct kobject *kobj,
 931                                struct attribute *attr,
 932                                char *buf)
 933 {
 934         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 935                                               ll_kset.kobj);
 936         unsigned int ealen;
 937         int rc;
 938
 939         rc = ll_get_max_mdsize(sbi, &ealen);
 940         if (rc)
 941                 return rc;
 942
 943         /* Limit xattr size returned to userspace based on kernel maximum */
 944         return scnprintf(buf, PAGE_SIZE, "%u\n",
 945                          ealen > XATTR_SIZE_MAX ? XATTR_SIZE_MAX : ealen);
 946 }
 947 LUSTRE_RO_ATTR(max_easize);
 948
 949 /**
 950  * Get default_easize.
 951  *
 952  * \see client_obd::cl_default_mds_easize
 953  *
 954  * \param[in] m         seq_file handle
 955  * \param[in] v         unused for single entry
 956  *
 957  * \retval 0            on success
 958  * \retval negative     negated errno on failure
 959  */
 960 static ssize_t default_easize_show(struct kobject *kobj,
 961                                    struct attribute *attr,
 962                                    char *buf)
 963 {
 964         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 965                                               ll_kset.kobj);
 966         unsigned int ealen;
 967         int rc;
 968
 969         rc = ll_get_default_mdsize(sbi, &ealen);
 970         if (rc)
 971                 return rc;
 972
 973         /* Limit xattr size returned to userspace based on kernel maximum */
 974         return scnprintf(buf, PAGE_SIZE, "%u\n",
 975                          ealen > XATTR_SIZE_MAX ? XATTR_SIZE_MAX : ealen);
 976 }
 977
 978 /**
 979  * Set default_easize.
 980  *
 981  * Range checking on the passed value is handled by
 982  * ll_set_default_mdsize().
 983  *
 984  * \see client_obd::cl_default_mds_easize
 985  *
 986  * \param[in] file      proc file
 987  * \param[in] buffer    string passed from user space
 988  * \param[in] count     \a buffer length
 989  * \param[in] off       unused for single entry
 990  *
 991  * \retval positive     \a count on success
 992  * \retval negative     negated errno on failure
 993  */
 994 static ssize_t default_easize_store(struct kobject *kobj,
 995                                     struct attribute *attr,
 996                                     const char *buffer,
 997                                     size_t count)
 998 {
 999         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1000                                               ll_kset.kobj);
1001         unsigned int val;
1002         int rc;
1003
1004         if (count == 0)
1005                 return 0;
1006
1007         rc = kstrtouint(buffer, 10, &val);
1008         if (rc)
1009                 return rc;
1010
1011         rc = ll_set_default_mdsize(sbi, val);
1012         if (rc)
1013                 return rc;
1014
1015         return count;
1016 }
1017 LUSTRE_RW_ATTR(default_easize);
1018
1019 LDEBUGFS_SEQ_FOPS_RO(ll_sbi_flags);
1020
1021 static ssize_t xattr_cache_show(struct kobject *kobj,
1022                                 struct attribute *attr,
1023                                 char *buf)
1024 {
1025         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1026                                               ll_kset.kobj);
1027
1028         return sprintf(buf, "%u\n", sbi->ll_xattr_cache_enabled);
1029 }
1030
1031 static ssize_t xattr_cache_store(struct kobject *kobj,
1032                                  struct attribute *attr,
1033                                  const char *buffer,
1034                                  size_t count)
1035 {
1036         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1037                                               ll_kset.kobj);
1038         bool val;
1039         int rc;
1040
1041         rc = kstrtobool(buffer, &val);
1042         if (rc)
1043                 return rc;
1044
1045         if (val && !test_bit(LL_SBI_XATTR_CACHE, sbi->ll_flags))
1046                 return -ENOTSUPP;
1047
1048         sbi->ll_xattr_cache_enabled = val;
1049         sbi->ll_xattr_cache_set = 1;
1050
1051         return count;
1052 }
1053 LUSTRE_RW_ATTR(xattr_cache);
1054
1055 static ssize_t tiny_write_show(struct kobject *kobj,
1056                                struct attribute *attr,
1057                                char *buf)
1058 {
1059         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1060                                               ll_kset.kobj);
1061
1062         return scnprintf(buf, PAGE_SIZE, "%u\n",
1063                          test_bit(LL_SBI_TINY_WRITE, sbi->ll_flags));
1064 }
1065
1066 static ssize_t tiny_write_store(struct kobject *kobj,
1067                                 struct attribute *attr,
1068                                 const char *buffer,
1069                                 size_t count)
1070 {
1071         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1072                                               ll_kset.kobj);
1073         bool val;
1074         int rc;
1075
1076         rc = kstrtobool(buffer, &val);
1077         if (rc)
1078                 return rc;
1079
1080         spin_lock(&sbi->ll_lock);
1081         if (val)
1082                 set_bit(LL_SBI_TINY_WRITE, sbi->ll_flags);
1083         else
1084                 clear_bit(LL_SBI_TINY_WRITE, sbi->ll_flags);
1085         spin_unlock(&sbi->ll_lock);
1086
1087         return count;
1088 }
1089 LUSTRE_RW_ATTR(tiny_write);
1090
1091 static ssize_t parallel_dio_show(struct kobject *kobj,
1092                                  struct attribute *attr,
1093                                  char *buf)
1094 {
1095         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1096                                               ll_kset.kobj);
1097
1098         return snprintf(buf, PAGE_SIZE, "%u\n",
1099                         test_bit(LL_SBI_PARALLEL_DIO, sbi->ll_flags));
1100 }
1101
1102 static ssize_t parallel_dio_store(struct kobject *kobj,
1103                                   struct attribute *attr,
1104                                   const char *buffer,
1105                                   size_t count)
1106 {
1107         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1108                                               ll_kset.kobj);
1109         bool val;
1110         int rc;
1111
1112         rc = kstrtobool(buffer, &val);
1113         if (rc)
1114                 return rc;
1115
1116         spin_lock(&sbi->ll_lock);
1117         if (val)
1118                 set_bit(LL_SBI_PARALLEL_DIO, sbi->ll_flags);
1119         else
1120                 clear_bit(LL_SBI_PARALLEL_DIO, sbi->ll_flags);
1121         spin_unlock(&sbi->ll_lock);
1122
1123         return count;
1124 }
1125 LUSTRE_RW_ATTR(parallel_dio);
1126
1127 static ssize_t max_read_ahead_async_active_show(struct kobject *kobj,
1128                                                struct attribute *attr,
1129                                                char *buf)
1130 {
1131         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1132                                               ll_kset.kobj);
1133
1134         return scnprintf(buf, PAGE_SIZE, "%u\n",
1135                          sbi->ll_ra_info.ra_async_max_active);
1136 }
1137
1138 static ssize_t max_read_ahead_async_active_store(struct kobject *kobj,
1139                                                  struct attribute *attr,
1140                                                  const char *buffer,
1141                                                  size_t count)
1142 {
1143         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1144                                               ll_kset.kobj);
1145         unsigned int val;
1146         int rc;
1147
1148         rc = kstrtouint(buffer, 10, &val);
1149         if (rc)
1150                 return rc;
1151
1152         /**
1153          * It doesn't make any sense to make it exceed what
1154          * workqueue could acutally support. This can easily
1155          * over subscripe the cores but Lustre internally
1156          * throttles to avoid those impacts.
1157          */
1158         if (val > WQ_UNBOUND_MAX_ACTIVE) {
1159                 CERROR("%s: cannot set max_read_ahead_async_active=%u larger than %u\n",
1160                        sbi->ll_fsname, val, WQ_UNBOUND_MAX_ACTIVE);
1161                 return -ERANGE;
1162         }
1163
1164         spin_lock(&sbi->ll_lock);
1165         sbi->ll_ra_info.ra_async_max_active = val;
1166         spin_unlock(&sbi->ll_lock);
1167
1168         return count;
1169 }
1170 LUSTRE_RW_ATTR(max_read_ahead_async_active);
1171
1172 static ssize_t read_ahead_async_file_threshold_mb_show(struct kobject *kobj,
1173                                                        struct attribute *attr,
1174                                                        char *buf)
1175 {
1176         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1177                                               ll_kset.kobj);
1178
1179         return scnprintf(buf, PAGE_SIZE, "%lu\n", PAGES_TO_MiB(
1180                          sbi->ll_ra_info.ra_async_pages_per_file_threshold));
1181 }
1182
1183 static ssize_t
1184 read_ahead_async_file_threshold_mb_store(struct kobject *kobj,
1185                                          struct attribute *attr,
1186                                          const char *buffer, size_t count)
1187 {
1188         unsigned long pages_number;
1189         unsigned long max_ra_per_file;
1190         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1191                                               ll_kset.kobj);
1192         int rc;
1193
1194         rc = kstrtoul(buffer, 10, &pages_number);
1195         if (rc)
1196                 return rc;
1197
1198         pages_number = MiB_TO_PAGES(pages_number);
1199         max_ra_per_file = sbi->ll_ra_info.ra_max_pages_per_file;
1200         if (pages_number < 0 || pages_number > max_ra_per_file) {
1201                 CERROR("%s: can't set read_ahead_async_file_threshold_mb=%lu > "
1202                        "max_read_readahead_per_file_mb=%lu\n", sbi->ll_fsname,
1203                        PAGES_TO_MiB(pages_number),
1204                        PAGES_TO_MiB(max_ra_per_file));
1205                 return -ERANGE;
1206         }
1207         sbi->ll_ra_info.ra_async_pages_per_file_threshold = pages_number;
1208
1209         return count;
1210 }
1211 LUSTRE_RW_ATTR(read_ahead_async_file_threshold_mb);
1212
1213 static ssize_t read_ahead_range_kb_show(struct kobject *kobj,
1214                                         struct attribute *attr,char *buf)
1215 {
1216         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1217                                               ll_kset.kobj);
1218
1219         return snprintf(buf, PAGE_SIZE, "%lu\n",
1220                         sbi->ll_ra_info.ra_range_pages << (PAGE_SHIFT - 10));
1221 }
1222
1223 static ssize_t
1224 read_ahead_range_kb_store(struct kobject *kobj,
1225                                struct attribute *attr,
1226                                const char *buffer, size_t count)
1227 {
1228         unsigned long pages_number;
1229         unsigned long max_ra_per_file;
1230         u64 val;
1231         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1232                                               ll_kset.kobj);
1233         int rc;
1234
1235         rc = sysfs_memparse(buffer, count, &val, "KiB");
1236         if (rc < 0)
1237                 return rc;
1238
1239         pages_number = val >> PAGE_SHIFT;
1240         /* Disable mmap range read */
1241         if (pages_number == 0)
1242                 goto out;
1243
1244         max_ra_per_file = sbi->ll_ra_info.ra_max_pages_per_file;
1245         if (pages_number > max_ra_per_file ||
1246             pages_number < RA_MIN_MMAP_RANGE_PAGES)
1247                 return -ERANGE;
1248
1249 out:
1250         spin_lock(&sbi->ll_lock);
1251         sbi->ll_ra_info.ra_range_pages = pages_number;
1252         spin_unlock(&sbi->ll_lock);
1253
1254         return count;
1255 }
1256 LUSTRE_RW_ATTR(read_ahead_range_kb);
1257
1258 static ssize_t fast_read_show(struct kobject *kobj,
1259                               struct attribute *attr,
1260                               char *buf)
1261 {
1262         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1263                                               ll_kset.kobj);
1264
1265         return scnprintf(buf, PAGE_SIZE, "%u\n",
1266                          test_bit(LL_SBI_FAST_READ, sbi->ll_flags));
1267 }
1268
1269 static ssize_t fast_read_store(struct kobject *kobj,
1270                                struct attribute *attr,
1271                                const char *buffer,
1272                                size_t count)
1273 {
1274         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1275                                               ll_kset.kobj);
1276         bool val;
1277         int rc;
1278
1279         rc = kstrtobool(buffer, &val);
1280         if (rc)
1281                 return rc;
1282
1283         spin_lock(&sbi->ll_lock);
1284         if (val)
1285                 set_bit(LL_SBI_FAST_READ, sbi->ll_flags);
1286         else
1287                 clear_bit(LL_SBI_FAST_READ, sbi->ll_flags);
1288         spin_unlock(&sbi->ll_lock);
1289
1290         return count;
1291 }
1292 LUSTRE_RW_ATTR(fast_read);
1293
1294 static ssize_t file_heat_show(struct kobject *kobj,
1295                               struct attribute *attr,
1296                               char *buf)
1297 {
1298         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1299                                               ll_kset.kobj);
1300
1301         return scnprintf(buf, PAGE_SIZE, "%u\n",
1302                          test_bit(LL_SBI_FILE_HEAT, sbi->ll_flags));
1303 }
1304
1305 static ssize_t file_heat_store(struct kobject *kobj,
1306                                struct attribute *attr,
1307                                const char *buffer,
1308                                size_t count)
1309 {
1310         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1311                                               ll_kset.kobj);
1312         bool val;
1313         int rc;
1314
1315         rc = kstrtobool(buffer, &val);
1316         if (rc)
1317                 return rc;
1318
1319         spin_lock(&sbi->ll_lock);
1320         if (val)
1321                 set_bit(LL_SBI_FILE_HEAT, sbi->ll_flags);
1322         else
1323                 clear_bit(LL_SBI_FILE_HEAT, sbi->ll_flags);
1324         spin_unlock(&sbi->ll_lock);
1325
1326         return count;
1327 }
1328 LUSTRE_RW_ATTR(file_heat);
1329
1330 static ssize_t heat_decay_percentage_show(struct kobject *kobj,
1331                                           struct attribute *attr,
1332                                           char *buf)
1333 {
1334         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1335                                               ll_kset.kobj);
1336
1337         return scnprintf(buf, PAGE_SIZE, "%u\n",
1338                          (sbi->ll_heat_decay_weight * 100 + 128) / 256);
1339 }
1340
1341 static ssize_t heat_decay_percentage_store(struct kobject *kobj,
1342                                            struct attribute *attr,
1343                                            const char *buffer,
1344                                            size_t count)
1345 {
1346         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1347                                               ll_kset.kobj);
1348         unsigned long val;
1349         int rc;
1350
1351         rc = kstrtoul(buffer, 10, &val);
1352         if (rc)
1353                 return rc;
1354
1355         if (val < 0 || val > 100)
1356                 return -ERANGE;
1357
1358         sbi->ll_heat_decay_weight = (val * 256 + 50) / 100;
1359
1360         return count;
1361 }
1362 LUSTRE_RW_ATTR(heat_decay_percentage);
1363
1364 static ssize_t heat_period_second_show(struct kobject *kobj,
1365                                        struct attribute *attr,
1366                                        char *buf)
1367 {
1368         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1369                                               ll_kset.kobj);
1370
1371         return scnprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_heat_period_second);
1372 }
1373
1374 static ssize_t heat_period_second_store(struct kobject *kobj,
1375                                         struct attribute *attr,
1376                                         const char *buffer,
1377                                         size_t count)
1378 {
1379         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1380                                               ll_kset.kobj);
1381         unsigned long val;
1382         int rc;
1383
1384         rc = kstrtoul(buffer, 10, &val);
1385         if (rc)
1386                 return rc;
1387
1388         if (val <= 0)
1389                 return -ERANGE;
1390
1391         sbi->ll_heat_period_second = val;
1392
1393         return count;
1394 }
1395 LUSTRE_RW_ATTR(heat_period_second);
1396
1397 static ssize_t opencache_threshold_count_show(struct kobject *kobj,
1398                                               struct attribute *attr,
1399                                               char *buf)
1400 {
1401         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1402                                               ll_kset.kobj);
1403
1404         if (sbi->ll_oc_thrsh_count)
1405                 return snprintf(buf, PAGE_SIZE, "%u\n",
1406                                 sbi->ll_oc_thrsh_count);
1407         else
1408                 return snprintf(buf, PAGE_SIZE, "off\n");
1409 }
1410
1411 static ssize_t opencache_threshold_count_store(struct kobject *kobj,
1412                                                struct attribute *attr,
1413                                                const char *buffer,
1414                                                size_t count)
1415 {
1416         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1417                                               ll_kset.kobj);
1418         unsigned int val;
1419         int rc;
1420
1421         rc = kstrtouint(buffer, 10, &val);
1422         if (rc) {
1423                 bool enable;
1424                 /* also accept "off" to disable and "on" to always cache */
1425                 rc = kstrtobool(buffer, &enable);
1426                 if (rc)
1427                         return rc;
1428                 val = enable;
1429         }
1430         sbi->ll_oc_thrsh_count = val;
1431
1432         return count;
1433 }
1434 LUSTRE_RW_ATTR(opencache_threshold_count);
1435
1436 static ssize_t opencache_threshold_ms_show(struct kobject *kobj,
1437                                            struct attribute *attr,
1438                                            char *buf)
1439 {
1440         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1441                                               ll_kset.kobj);
1442
1443         return snprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_oc_thrsh_ms);
1444 }
1445
1446 static ssize_t opencache_threshold_ms_store(struct kobject *kobj,
1447                                             struct attribute *attr,
1448                                             const char *buffer,
1449                                             size_t count)
1450 {
1451         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1452                                               ll_kset.kobj);
1453         unsigned int val;
1454         int rc;
1455
1456         rc = kstrtouint(buffer, 10, &val);
1457         if (rc)
1458                 return rc;
1459
1460         sbi->ll_oc_thrsh_ms = val;
1461
1462         return count;
1463 }
1464 LUSTRE_RW_ATTR(opencache_threshold_ms);
1465
1466 static ssize_t opencache_max_ms_show(struct kobject *kobj,
1467                                      struct attribute *attr,
1468                                      char *buf)
1469 {
1470         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1471                                               ll_kset.kobj);
1472
1473         return snprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_oc_max_ms);
1474 }
1475
1476 static ssize_t opencache_max_ms_store(struct kobject *kobj,
1477                                       struct attribute *attr,
1478                                       const char *buffer,
1479                                       size_t count)
1480 {
1481         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1482                                               ll_kset.kobj);
1483         unsigned int val;
1484         int rc;
1485
1486         rc = kstrtouint(buffer, 10, &val);
1487         if (rc)
1488                 return rc;
1489
1490         sbi->ll_oc_max_ms = val;
1491
1492         return count;
1493 }
1494 LUSTRE_RW_ATTR(opencache_max_ms);
1495
1496 static ssize_t inode_cache_show(struct kobject *kobj,
1497                                 struct attribute *attr,
1498                                 char *buf)
1499 {
1500         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1501                                               ll_kset.kobj);
1502
1503         return snprintf(buf, PAGE_SIZE, "%u\n", sbi->ll_inode_cache_enabled);
1504 }
1505
1506 static ssize_t inode_cache_store(struct kobject *kobj,
1507                                  struct attribute *attr,
1508                                  const char *buffer,
1509                                  size_t count)
1510 {
1511         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1512                                               ll_kset.kobj);
1513         bool val;
1514         int rc;
1515
1516         rc = kstrtobool(buffer, &val);
1517         if (rc)
1518                 return rc;
1519
1520         sbi->ll_inode_cache_enabled = val;
1521
1522         return count;
1523 }
1524 LUSTRE_RW_ATTR(inode_cache);
1525
1526 static int ll_unstable_stats_seq_show(struct seq_file *m, void *v)
1527 {
1528         struct super_block      *sb    = m->private;
1529         struct ll_sb_info       *sbi   = ll_s2sbi(sb);
1530         struct cl_client_cache  *cache = sbi->ll_cache;
1531         long pages;
1532         int mb;
1533
1534         pages = atomic_long_read(&cache->ccc_unstable_nr);
1535         mb    = (pages * PAGE_SIZE) >> 20;
1536
1537         seq_printf(m, "unstable_check:     %8d\n"
1538                       "unstable_pages: %12ld\n"
1539                       "unstable_mb:        %8d\n",
1540                    cache->ccc_unstable_check, pages, mb);
1541         return 0;
1542 }
1543
1544 static ssize_t ll_unstable_stats_seq_write(struct file *file,
1545                                            const char __user *buffer,
1546                                            size_t count, loff_t *unused)
1547 {
1548         struct seq_file *seq = file->private_data;
1549         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)seq->private);
1550         char kernbuf[128];
1551         bool val;
1552         int rc;
1553
1554         if (count == 0)
1555                 return 0;
1556         if (count >= sizeof(kernbuf))
1557                 return -EINVAL;
1558
1559         if (copy_from_user(kernbuf, buffer, count))
1560                 return -EFAULT;
1561         kernbuf[count] = 0;
1562
1563         buffer += lprocfs_find_named_value(kernbuf, "unstable_check:", &count) -
1564                   kernbuf;
1565         rc = kstrtobool_from_user(buffer, count, &val);
1566         if (rc < 0)
1567                 return rc;
1568
1569         /* borrow lru lock to set the value */
1570         spin_lock(&sbi->ll_cache->ccc_lru_lock);
1571         sbi->ll_cache->ccc_unstable_check = val;
1572         spin_unlock(&sbi->ll_cache->ccc_lru_lock);
1573
1574         return count;
1575 }
1576
1577 LDEBUGFS_SEQ_FOPS(ll_unstable_stats);
1578
1579 static int ll_root_squash_seq_show(struct seq_file *m, void *v)
1580 {
1581         struct super_block *sb = m->private;
1582         struct ll_sb_info *sbi = ll_s2sbi(sb);
1583         struct root_squash_info *squash = &sbi->ll_squash;
1584
1585         seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
1586         return 0;
1587 }
1588
1589 static ssize_t ll_root_squash_seq_write(struct file *file,
1590                                         const char __user *buffer,
1591                                         size_t count, loff_t *off)
1592 {
1593         struct seq_file *m = file->private_data;
1594         struct super_block *sb = m->private;
1595         struct ll_sb_info *sbi = ll_s2sbi(sb);
1596         struct root_squash_info *squash = &sbi->ll_squash;
1597
1598         return lprocfs_wr_root_squash(buffer, count, squash, sbi->ll_fsname);
1599 }
1600
1601 LDEBUGFS_SEQ_FOPS(ll_root_squash);
1602
1603 static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
1604 {
1605         struct super_block *sb = m->private;
1606         struct ll_sb_info *sbi = ll_s2sbi(sb);
1607         struct root_squash_info *squash = &sbi->ll_squash;
1608         int len;
1609
1610         spin_lock(&squash->rsi_lock);
1611         if (!list_empty(&squash->rsi_nosquash_nids)) {
1612                 len = cfs_print_nidlist(m->buf + m->count, m->size - m->count,
1613                                         &squash->rsi_nosquash_nids);
1614                 m->count += len;
1615                 seq_putc(m, '\n');
1616         } else {
1617                 seq_puts(m, "NONE\n");
1618         }
1619         spin_unlock(&squash->rsi_lock);
1620
1621         return 0;
1622 }
1623
1624 static ssize_t ll_nosquash_nids_seq_write(struct file *file,
1625                                           const char __user *buffer,
1626                                           size_t count, loff_t *off)
1627 {
1628         struct seq_file *m = file->private_data;
1629         struct super_block *sb = m->private;
1630         struct ll_sb_info *sbi = ll_s2sbi(sb);
1631         struct root_squash_info *squash = &sbi->ll_squash;
1632         int rc;
1633
1634         rc = lprocfs_wr_nosquash_nids(buffer, count, squash, sbi->ll_fsname);
1635         if (rc < 0)
1636                 return rc;
1637
1638         ll_compute_rootsquash_state(sbi);
1639
1640         return rc;
1641 }
1642
1643 LDEBUGFS_SEQ_FOPS(ll_nosquash_nids);
1644
1645 static int ll_filename_enc_seq_show(struct seq_file *m, void *v)
1646 {
1647         struct super_block *sb = m->private;
1648         struct lustre_sb_info *lsi = s2lsi(sb);
1649
1650         seq_printf(m, "%u\n", lsi->lsi_flags & LSI_FILENAME_ENC ? 1 : 0);
1651         return 0;
1652 }
1653
1654 static ssize_t ll_filename_enc_seq_write(struct file *file,
1655                                          const char __user *buffer,
1656                                          size_t count, loff_t *off)
1657 {
1658         struct seq_file *m = file->private_data;
1659         struct super_block *sb = m->private;
1660         struct lustre_sb_info *lsi = s2lsi(sb);
1661         struct ll_sb_info *sbi = ll_s2sbi(sb);
1662         bool val;
1663         int rc;
1664
1665         rc = kstrtobool_from_user(buffer, count, &val);
1666         if (rc)
1667                 return rc;
1668
1669         if (val) {
1670                 if (!ll_sbi_has_name_encrypt(sbi)) {
1671                         /* server does not support name encryption,
1672                          * so force it to NULL on client
1673                          */
1674                         CDEBUG(D_SEC, "%s: server does not support name encryption\n",
1675                                sbi->ll_fsname);
1676                         lsi->lsi_flags &= ~LSI_FILENAME_ENC;
1677                         return -EOPNOTSUPP;
1678                 }
1679
1680                 lsi->lsi_flags |= LSI_FILENAME_ENC;
1681         } else {
1682                 lsi->lsi_flags &= ~LSI_FILENAME_ENC;
1683         }
1684
1685         return count;
1686 }
1687
1688 LDEBUGFS_SEQ_FOPS(ll_filename_enc);
1689
1690 static int ll_pcc_seq_show(struct seq_file *m, void *v)
1691 {
1692         struct super_block *sb = m->private;
1693         struct ll_sb_info *sbi = ll_s2sbi(sb);
1694
1695         return pcc_super_dump(&sbi->ll_pcc_super, m);
1696 }
1697
1698 static ssize_t ll_pcc_seq_write(struct file *file, const char __user *buffer,
1699                                 size_t count, loff_t *off)
1700 {
1701         struct seq_file *m = file->private_data;
1702         struct super_block *sb = m->private;
1703         struct ll_sb_info *sbi = ll_s2sbi(sb);
1704         int rc;
1705         char *kernbuf;
1706
1707         if (count >= LPROCFS_WR_PCC_MAX_CMD)
1708                 return -EINVAL;
1709
1710         if (!(exp_connect_flags2(sbi->ll_md_exp) & OBD_CONNECT2_PCC))
1711                 return -EOPNOTSUPP;
1712
1713         OBD_ALLOC(kernbuf, count + 1);
1714         if (kernbuf == NULL)
1715                 return -ENOMEM;
1716
1717         if (copy_from_user(kernbuf, buffer, count))
1718                 GOTO(out_free_kernbuff, rc = -EFAULT);
1719
1720         rc = pcc_cmd_handle(kernbuf, count, &sbi->ll_pcc_super);
1721 out_free_kernbuff:
1722         OBD_FREE(kernbuf, count + 1);
1723         return rc ? rc : count;
1724 }
1725 LDEBUGFS_SEQ_FOPS(ll_pcc);
1726
1727 struct ldebugfs_vars lprocfs_llite_obd_vars[] = {
1728         { .name =       "site",
1729           .fops =       &ll_site_stats_fops                     },
1730         { .name =       "max_cached_mb",
1731           .fops =       &ll_max_cached_mb_fops                  },
1732         { .name =       "statahead_stats",
1733           .fops =       &ll_statahead_stats_fops                },
1734         { .name =       "unstable_stats",
1735           .fops =       &ll_unstable_stats_fops                 },
1736         { .name =       "sbi_flags",
1737           .fops =       &ll_sbi_flags_fops                      },
1738         { .name =       "root_squash",
1739           .fops =       &ll_root_squash_fops                    },
1740         { .name =       "nosquash_nids",
1741           .fops =       &ll_nosquash_nids_fops                  },
1742         { .name =       "pcc",
1743           .fops =       &ll_pcc_fops,                           },
1744         { .name =       "enable_filename_encryption",
1745           .fops =       &ll_filename_enc_fops,                  },
1746         { NULL }
1747 };
1748
1749 #define MAX_STRING_SIZE 128
1750
1751 static struct attribute *llite_attrs[] = {
1752         &lustre_attr_blocksize.attr,
1753         &lustre_attr_stat_blocksize.attr,
1754         &lustre_attr_kbytestotal.attr,
1755         &lustre_attr_kbytesfree.attr,
1756         &lustre_attr_kbytesavail.attr,
1757         &lustre_attr_filestotal.attr,
1758         &lustre_attr_filesfree.attr,
1759         &lustre_attr_client_type.attr,
1760         &lustre_attr_foreign_symlink_enable.attr,
1761         &lustre_attr_foreign_symlink_prefix.attr,
1762         &lustre_attr_foreign_symlink_upcall.attr,
1763         &lustre_attr_foreign_symlink_upcall_info.attr,
1764         &lustre_attr_fstype.attr,
1765         &lustre_attr_uuid.attr,
1766         &lustre_attr_checksums.attr,
1767         &lustre_attr_checksum_pages.attr,
1768         &lustre_attr_max_read_ahead_mb.attr,
1769         &lustre_attr_max_read_ahead_per_file_mb.attr,
1770         &lustre_attr_max_read_ahead_whole_mb.attr,
1771         &lustre_attr_max_read_ahead_async_active.attr,
1772         &lustre_attr_read_ahead_async_file_threshold_mb.attr,
1773         &lustre_attr_read_ahead_range_kb.attr,
1774         &lustre_attr_stats_track_pid.attr,
1775         &lustre_attr_stats_track_ppid.attr,
1776         &lustre_attr_stats_track_gid.attr,
1777         &lustre_attr_statahead_running_max.attr,
1778         &lustre_attr_statahead_max.attr,
1779         &lustre_attr_statahead_agl.attr,
1780         &lustre_attr_lazystatfs.attr,
1781         &lustre_attr_statfs_max_age.attr,
1782         &lustre_attr_max_easize.attr,
1783         &lustre_attr_default_easize.attr,
1784         &lustre_attr_xattr_cache.attr,
1785         &lustre_attr_fast_read.attr,
1786         &lustre_attr_tiny_write.attr,
1787         &lustre_attr_parallel_dio.attr,
1788         &lustre_attr_file_heat.attr,
1789         &lustre_attr_heat_decay_percentage.attr,
1790         &lustre_attr_heat_period_second.attr,
1791         &lustre_attr_opencache_threshold_count.attr,
1792         &lustre_attr_opencache_threshold_ms.attr,
1793         &lustre_attr_opencache_max_ms.attr,
1794         &lustre_attr_inode_cache.attr,
1795         NULL,
1796 };
1797
1798 static void sbi_kobj_release(struct kobject *kobj)
1799 {
1800         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1801                                               ll_kset.kobj);
1802         complete(&sbi->ll_kobj_unregister);
1803 }
1804
1805 static struct kobj_type sbi_ktype = {
1806         .default_attrs  = llite_attrs,
1807         .sysfs_ops      = &lustre_sysfs_ops,
1808         .release        = sbi_kobj_release,
1809 };
1810
1811 static const struct llite_file_opcode {
1812         __u32                           lfo_opcode;
1813         enum lprocfs_counter_config     lfo_config;
1814         const char                      *lfo_opname;
1815 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
1816         /* file operation */
1817         { LPROC_LL_READ_BYTES,  LPROCFS_TYPE_BYTES_FULL, "read_bytes" },
1818         { LPROC_LL_WRITE_BYTES, LPROCFS_TYPE_BYTES_FULL, "write_bytes" },
1819         { LPROC_LL_READ,        LPROCFS_TYPE_LATENCY,   "read" },
1820         { LPROC_LL_WRITE,       LPROCFS_TYPE_LATENCY,   "write" },
1821         { LPROC_LL_IOCTL,       LPROCFS_TYPE_REQS,      "ioctl" },
1822         { LPROC_LL_OPEN,        LPROCFS_TYPE_LATENCY,   "open" },
1823         { LPROC_LL_RELEASE,     LPROCFS_TYPE_LATENCY,   "close" },
1824         { LPROC_LL_MMAP,        LPROCFS_TYPE_LATENCY,   "mmap" },
1825         { LPROC_LL_FAULT,       LPROCFS_TYPE_LATENCY,   "page_fault" },
1826         { LPROC_LL_MKWRITE,     LPROCFS_TYPE_LATENCY,   "page_mkwrite" },
1827         { LPROC_LL_LLSEEK,      LPROCFS_TYPE_LATENCY,   "seek" },
1828         { LPROC_LL_FSYNC,       LPROCFS_TYPE_LATENCY,   "fsync" },
1829         { LPROC_LL_READDIR,     LPROCFS_TYPE_LATENCY,   "readdir" },
1830         { LPROC_LL_INODE_OCOUNT, LPROCFS_TYPE_REQS | LPROCFS_CNTR_AVGMINMAX |
1831                                 LPROCFS_CNTR_STDDEV,    "opencount" },
1832         { LPROC_LL_INODE_OPCLTM,LPROCFS_TYPE_LATENCY,   "openclosetime" },
1833         /* inode operation */
1834         { LPROC_LL_SETATTR,     LPROCFS_TYPE_LATENCY,   "setattr" },
1835         { LPROC_LL_TRUNC,       LPROCFS_TYPE_LATENCY,   "truncate" },
1836         { LPROC_LL_FLOCK,       LPROCFS_TYPE_LATENCY,   "flock" },
1837         { LPROC_LL_GETATTR,     LPROCFS_TYPE_LATENCY,   "getattr" },
1838         { LPROC_LL_FALLOCATE,   LPROCFS_TYPE_LATENCY,   "fallocate"},
1839         /* dir inode operation */
1840         { LPROC_LL_CREATE,      LPROCFS_TYPE_LATENCY,   "create" },
1841         { LPROC_LL_LINK,        LPROCFS_TYPE_LATENCY,   "link" },
1842         { LPROC_LL_UNLINK,      LPROCFS_TYPE_LATENCY,   "unlink" },
1843         { LPROC_LL_SYMLINK,     LPROCFS_TYPE_LATENCY,   "symlink" },
1844         { LPROC_LL_MKDIR,       LPROCFS_TYPE_LATENCY,   "mkdir" },
1845         { LPROC_LL_RMDIR,       LPROCFS_TYPE_LATENCY,   "rmdir" },
1846         { LPROC_LL_MKNOD,       LPROCFS_TYPE_LATENCY,   "mknod" },
1847         { LPROC_LL_RENAME,      LPROCFS_TYPE_LATENCY,   "rename" },
1848         /* special inode operation */
1849         { LPROC_LL_STATFS,      LPROCFS_TYPE_LATENCY,   "statfs" },
1850         { LPROC_LL_SETXATTR,    LPROCFS_TYPE_LATENCY,   "setxattr" },
1851         { LPROC_LL_GETXATTR,    LPROCFS_TYPE_LATENCY,   "getxattr" },
1852         { LPROC_LL_GETXATTR_HITS, LPROCFS_TYPE_REQS,    "getxattr_hits" },
1853         { LPROC_LL_LISTXATTR,   LPROCFS_TYPE_LATENCY,   "listxattr" },
1854         { LPROC_LL_REMOVEXATTR, LPROCFS_TYPE_LATENCY,   "removexattr" },
1855         { LPROC_LL_INODE_PERM,  LPROCFS_TYPE_LATENCY,   "inode_permission" },
1856 };
1857
1858 void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, long count)
1859 {
1860         if (!sbi->ll_stats)
1861                 return;
1862
1863         if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
1864                 lprocfs_counter_add(sbi->ll_stats, op, count);
1865         else if (sbi->ll_stats_track_type == STATS_TRACK_PID &&
1866                  sbi->ll_stats_track_id == current->pid)
1867                 lprocfs_counter_add(sbi->ll_stats, op, count);
1868         else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
1869                  sbi->ll_stats_track_id == current->real_parent->pid)
1870                 lprocfs_counter_add(sbi->ll_stats, op, count);
1871         else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
1872                  sbi->ll_stats_track_id ==
1873                         from_kgid(&init_user_ns, current_gid()))
1874                 lprocfs_counter_add(sbi->ll_stats, op, count);
1875 }
1876 EXPORT_SYMBOL(ll_stats_ops_tally);
1877
1878 static const char *const ra_stat_string[] = {
1879         [RA_STAT_HIT]                   = "hits",
1880         [RA_STAT_MISS]                  = "misses",
1881         [RA_STAT_DISTANT_READPAGE]      = "readpage_not_consecutive",
1882         [RA_STAT_MISS_IN_WINDOW]        = "miss_inside_window",
1883         [RA_STAT_FAILED_GRAB_PAGE]      = "failed_grab_cache_page",
1884         [RA_STAT_FAILED_MATCH]          = "failed_lock_match",
1885         [RA_STAT_DISCARDED]             = "read_but_discarded",
1886         [RA_STAT_ZERO_LEN]              = "zero_length_file",
1887         [RA_STAT_ZERO_WINDOW]           = "zero_size_window",
1888         [RA_STAT_EOF]                   = "readahead_to_eof",
1889         [RA_STAT_MAX_IN_FLIGHT]         = "hit_max_readahead_issue",
1890         [RA_STAT_WRONG_GRAB_PAGE]       = "wrong_page_from_grab_cache_page",
1891         [RA_STAT_FAILED_REACH_END]      = "failed_to_reach_end",
1892         [RA_STAT_ASYNC]                 = "async_readahead",
1893         [RA_STAT_FAILED_FAST_READ]      = "failed_to_fast_read",
1894         [RA_STAT_MMAP_RANGE_READ]       = "mmap_range_read",
1895 };
1896
1897 int ll_debugfs_register_super(struct super_block *sb, const char *name)
1898 {
1899         struct lustre_sb_info *lsi = s2lsi(sb);
1900         struct ll_sb_info *sbi = ll_s2sbi(sb);
1901         int err, id;
1902
1903         ENTRY;
1904         LASSERT(sbi);
1905
1906         if (IS_ERR_OR_NULL(llite_root))
1907                 goto out_ll_kset;
1908
1909         sbi->ll_debugfs_entry = debugfs_create_dir(name, llite_root);
1910         ldebugfs_add_vars(sbi->ll_debugfs_entry, lprocfs_llite_obd_vars, sb);
1911
1912         debugfs_create_file("dump_page_cache", 0444, sbi->ll_debugfs_entry, sbi,
1913                             &vvp_dump_pgcache_file_ops);
1914
1915         debugfs_create_file("extents_stats", 0644, sbi->ll_debugfs_entry, sbi,
1916                                  &ll_rw_extents_stats_fops);
1917
1918         debugfs_create_file("extents_stats_per_process", 0644,
1919                             sbi->ll_debugfs_entry, sbi,
1920                             &ll_rw_extents_stats_pp_fops);
1921
1922         debugfs_create_file("offset_stats", 0644, sbi->ll_debugfs_entry, sbi,
1923                             &ll_rw_offset_stats_fops);
1924
1925         /* File operations stats */
1926         sbi->ll_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES,
1927                                             LPROCFS_STATS_FLAG_NONE);
1928         if (sbi->ll_stats == NULL)
1929                 GOTO(out_debugfs, err = -ENOMEM);
1930
1931         /* do counter init */
1932         for (id = 0; id < LPROC_LL_FILE_OPCODES; id++)
1933                 lprocfs_counter_init(sbi->ll_stats,
1934                                      llite_opcode_table[id].lfo_opcode,
1935                                      llite_opcode_table[id].lfo_config,
1936                                      llite_opcode_table[id].lfo_opname);
1937
1938         debugfs_create_file("stats", 0644, sbi->ll_debugfs_entry,
1939                             sbi->ll_stats, &ldebugfs_stats_seq_fops);
1940
1941         sbi->ll_ra_stats = lprocfs_alloc_stats(ARRAY_SIZE(ra_stat_string),
1942                                                LPROCFS_STATS_FLAG_NONE);
1943         if (sbi->ll_ra_stats == NULL)
1944                 GOTO(out_stats, err = -ENOMEM);
1945
1946         for (id = 0; id < ARRAY_SIZE(ra_stat_string); id++)
1947                 lprocfs_counter_init(sbi->ll_ra_stats, id, LPROCFS_TYPE_PAGES,
1948                                      ra_stat_string[id]);
1949
1950         debugfs_create_file("read_ahead_stats", 0644, sbi->ll_debugfs_entry,
1951                             sbi->ll_ra_stats, &ldebugfs_stats_seq_fops);
1952
1953 out_ll_kset:
1954         /* Yes we also register sysfs mount kset here as well */
1955         sbi->ll_kset.kobj.parent = llite_kobj;
1956         sbi->ll_kset.kobj.ktype = &sbi_ktype;
1957         init_completion(&sbi->ll_kobj_unregister);
1958         err = kobject_set_name(&sbi->ll_kset.kobj, "%s", name);
1959         if (err)
1960                 GOTO(out_ra_stats, err);
1961
1962         err = kset_register(&sbi->ll_kset);
1963         if (err)
1964                 GOTO(out_ra_stats, err);
1965
1966         lsi->lsi_kobj = kobject_get(&sbi->ll_kset.kobj);
1967
1968         RETURN(0);
1969 out_ra_stats:
1970         lprocfs_free_stats(&sbi->ll_ra_stats);
1971 out_stats:
1972         lprocfs_free_stats(&sbi->ll_stats);
1973 out_debugfs:
1974         debugfs_remove_recursive(sbi->ll_debugfs_entry);
1975
1976         RETURN(err);
1977 }
1978
1979 void ll_debugfs_unregister_super(struct super_block *sb)
1980 {
1981         struct lustre_sb_info *lsi = s2lsi(sb);
1982         struct ll_sb_info *sbi = ll_s2sbi(sb);
1983
1984         debugfs_remove_recursive(sbi->ll_debugfs_entry);
1985
1986         if (sbi->ll_dt_obd)
1987                 sysfs_remove_link(&sbi->ll_kset.kobj,
1988                                   sbi->ll_dt_obd->obd_type->typ_name);
1989
1990         if (sbi->ll_md_obd)
1991                 sysfs_remove_link(&sbi->ll_kset.kobj,
1992                                   sbi->ll_md_obd->obd_type->typ_name);
1993
1994         kobject_put(lsi->lsi_kobj);
1995
1996         kset_unregister(&sbi->ll_kset);
1997         wait_for_completion(&sbi->ll_kobj_unregister);
1998
1999         lprocfs_free_stats(&sbi->ll_ra_stats);
2000         lprocfs_free_stats(&sbi->ll_stats);
2001 }
2002 #undef MAX_STRING_SIZE
2003
2004 static void ll_display_extents_info(struct ll_rw_extents_info *rw_extents,
2005                                     struct seq_file *seq, int which)
2006 {
2007         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
2008         unsigned long start, end, r, w;
2009         char *unitp = "KMGTPEZY";
2010         int i, units = 10;
2011         struct per_process_info *pp_info;
2012
2013         pp_info = &rw_extents->pp_extents[which];
2014         read_cum = 0;
2015         write_cum = 0;
2016         start = 0;
2017
2018         for (i = 0; i < LL_HIST_MAX; i++) {
2019                 read_tot += pp_info->pp_r_hist.oh_buckets[i];
2020                 write_tot += pp_info->pp_w_hist.oh_buckets[i];
2021         }
2022
2023         for (i = 0; i < LL_HIST_MAX; i++) {
2024                 r = pp_info->pp_r_hist.oh_buckets[i];
2025                 w = pp_info->pp_w_hist.oh_buckets[i];
2026                 read_cum += r;
2027                 write_cum += w;
2028                 end = 1 << (i + LL_HIST_START - units);
2029                 seq_printf(seq, "%4lu%c - %4lu%c%c: %14lu %4u %4u  | "
2030                            "%14lu %4u %4u\n", start, *unitp, end, *unitp,
2031                            (i == LL_HIST_MAX - 1) ? '+' : ' ',
2032                            r, pct(r, read_tot), pct(read_cum, read_tot),
2033                            w, pct(w, write_tot), pct(write_cum, write_tot));
2034                 start = end;
2035                 if (start == (1 << 10)) {
2036                         start = 1;
2037                         units += 10;
2038                         unitp++;
2039                 }
2040                 if (read_cum == read_tot && write_cum == write_tot)
2041                         break;
2042         }
2043 }
2044
2045 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
2046 {
2047         struct ll_sb_info *sbi = seq->private;
2048         struct ll_rw_extents_info *rw_extents = sbi->ll_rw_extents_info;
2049         int k;
2050
2051         if (!sbi->ll_rw_stats_on || !rw_extents) {
2052                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
2053                 return 0;
2054         }
2055
2056         spin_lock(&sbi->ll_pp_extent_lock);
2057         lprocfs_stats_header(seq, ktime_get(), rw_extents->pp_init, 25, ":", 1);
2058         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
2059         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
2060                    "extents", "calls", "%", "cum%", "calls", "%", "cum%");
2061
2062         for (k = 0; k < LL_PROCESS_HIST_MAX; k++) {
2063                 if (rw_extents->pp_extents[k].pid != 0) {
2064                         seq_printf(seq, "\nPID: %d\n",
2065                                    rw_extents->pp_extents[k].pid);
2066                         ll_display_extents_info(rw_extents, seq, k);
2067                 }
2068         }
2069         spin_unlock(&sbi->ll_pp_extent_lock);
2070         return 0;
2071 }
2072
2073 static int alloc_rw_stats_info(struct ll_sb_info *sbi)
2074 {
2075         struct ll_rw_extents_info *rw_extents;
2076         struct ll_rw_process_info *offset;
2077         struct ll_rw_process_info *process;
2078         int i, rc = 0;
2079
2080         OBD_ALLOC(rw_extents, sizeof(*rw_extents));
2081         if (!rw_extents)
2082                 return -ENOMEM;
2083
2084         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
2085                 spin_lock_init(&rw_extents->pp_extents[i].pp_r_hist.oh_lock);
2086                 spin_lock_init(&rw_extents->pp_extents[i].pp_w_hist.oh_lock);
2087         }
2088
2089         spin_lock(&sbi->ll_pp_extent_lock);
2090         if (!sbi->ll_rw_extents_info)
2091                 sbi->ll_rw_extents_info = rw_extents;
2092         spin_unlock(&sbi->ll_pp_extent_lock);
2093         /* another writer allocated the struct before we got the lock */
2094         if (sbi->ll_rw_extents_info != rw_extents)
2095                 OBD_FREE(rw_extents, sizeof(*rw_extents));
2096
2097         OBD_ALLOC(process, sizeof(*process) * LL_PROCESS_HIST_MAX);
2098         if (!process)
2099                 GOTO(out, rc = -ENOMEM);
2100         OBD_ALLOC(offset, sizeof(*offset) * LL_OFFSET_HIST_MAX);
2101         if (!offset)
2102                 GOTO(out_free, rc = -ENOMEM);
2103
2104         spin_lock(&sbi->ll_process_lock);
2105         if (!sbi->ll_rw_process_info)
2106                 sbi->ll_rw_process_info = process;
2107         if (!sbi->ll_rw_offset_info)
2108                 sbi->ll_rw_offset_info = offset;
2109         spin_unlock(&sbi->ll_process_lock);
2110
2111         /* another writer allocated the structs before we got the lock */
2112         if (sbi->ll_rw_offset_info != offset)
2113                 OBD_FREE(offset, sizeof(*offset) * LL_OFFSET_HIST_MAX);
2114         if (sbi->ll_rw_process_info != process) {
2115 out_free:
2116                 OBD_FREE(process, sizeof(*process) * LL_PROCESS_HIST_MAX);
2117         }
2118
2119 out:
2120         return rc;
2121 }
2122
2123 void ll_free_rw_stats_info(struct ll_sb_info *sbi)
2124 {
2125         if (sbi->ll_rw_extents_info) {
2126                 OBD_FREE(sbi->ll_rw_extents_info,
2127                          sizeof(*sbi->ll_rw_extents_info));
2128                 sbi->ll_rw_extents_info = NULL;
2129         }
2130         if (sbi->ll_rw_offset_info) {
2131                 OBD_FREE(sbi->ll_rw_offset_info,
2132                          sizeof(*sbi->ll_rw_offset_info) * LL_OFFSET_HIST_MAX);
2133                 sbi->ll_rw_offset_info = NULL;
2134         }
2135         if (sbi->ll_rw_process_info) {
2136                 OBD_FREE(sbi->ll_rw_process_info,
2137                         sizeof(*sbi->ll_rw_process_info) * LL_PROCESS_HIST_MAX);
2138                 sbi->ll_rw_process_info = NULL;
2139         }
2140 }
2141
2142 static ssize_t ll_rw_extents_stats_pp_seq_write(struct file *file,
2143                                                 const char __user *buf,
2144                                                 size_t len, loff_t *off)
2145 {
2146         struct seq_file *seq = file->private_data;
2147         struct ll_sb_info *sbi = seq->private;
2148         struct ll_rw_extents_info *rw_extents;
2149         int i;
2150         __s64 value;
2151
2152         if (len == 0)
2153                 return -EINVAL;
2154
2155         value = ll_stats_pid_write(buf, len);
2156
2157         if (value == 0) {
2158                 sbi->ll_rw_stats_on = 0;
2159         } else {
2160                 if (!sbi->ll_rw_extents_info) {
2161                         int rc = alloc_rw_stats_info(sbi);
2162
2163                         if (rc)
2164                                 return rc;
2165                 }
2166                 sbi->ll_rw_stats_on = 1;
2167         }
2168
2169
2170         spin_lock(&sbi->ll_pp_extent_lock);
2171         rw_extents = sbi->ll_rw_extents_info;
2172         if (rw_extents) {
2173                 rw_extents->pp_init = ktime_get();
2174                 for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
2175                         rw_extents->pp_extents[i].pid = 0;
2176                         lprocfs_oh_clear(&rw_extents->pp_extents[i].pp_r_hist);
2177                         lprocfs_oh_clear(&rw_extents->pp_extents[i].pp_w_hist);
2178                 }
2179         }
2180         spin_unlock(&sbi->ll_pp_extent_lock);
2181
2182         return len;
2183 }
2184
2185 LDEBUGFS_SEQ_FOPS(ll_rw_extents_stats_pp);
2186
2187 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
2188 {
2189         struct ll_sb_info *sbi = seq->private;
2190         struct ll_rw_extents_info *rw_extents = sbi->ll_rw_extents_info;
2191
2192         if (!sbi->ll_rw_stats_on || !rw_extents) {
2193                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
2194                 return 0;
2195         }
2196
2197         spin_lock(&sbi->ll_lock);
2198         lprocfs_stats_header(seq, ktime_get(), rw_extents->pp_init, 25, ":", 1);
2199
2200         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
2201         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
2202                    "extents", "calls", "%", "cum%",
2203                    "calls", "%", "cum%");
2204
2205         ll_display_extents_info(rw_extents, seq, LL_PROCESS_HIST_MAX);
2206         spin_unlock(&sbi->ll_lock);
2207
2208         return 0;
2209 }
2210
2211 static ssize_t ll_rw_extents_stats_seq_write(struct file *file,
2212                                              const char __user *buf,
2213                                              size_t len, loff_t *off)
2214 {
2215         struct seq_file *seq = file->private_data;
2216         struct ll_sb_info *sbi = seq->private;
2217         struct ll_rw_extents_info *rw_extents;
2218         int i;
2219         __s64 value;
2220
2221         if (len == 0)
2222                 return -EINVAL;
2223
2224         value = ll_stats_pid_write(buf, len);
2225
2226         if (value == 0) {
2227                 sbi->ll_rw_stats_on = 0;
2228         } else {
2229                 if (!sbi->ll_rw_extents_info) {
2230                         int rc = alloc_rw_stats_info(sbi);
2231
2232                         if (rc)
2233                                 return rc;
2234                 }
2235                 sbi->ll_rw_stats_on = 1;
2236         }
2237
2238         spin_lock(&sbi->ll_pp_extent_lock);
2239         rw_extents = sbi->ll_rw_extents_info;
2240         if (rw_extents) {
2241                 rw_extents->pp_init = ktime_get();
2242                 for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
2243                         rw_extents->pp_extents[i].pid = 0;
2244                         lprocfs_oh_clear(&rw_extents->pp_extents[i].pp_r_hist);
2245                         lprocfs_oh_clear(&rw_extents->pp_extents[i].pp_w_hist);
2246                 }
2247         }
2248         spin_unlock(&sbi->ll_pp_extent_lock);
2249
2250         return len;
2251 }
2252
2253 LDEBUGFS_SEQ_FOPS(ll_rw_extents_stats);
2254
2255 void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
2256                        struct ll_file_data *file, loff_t pos,
2257                        size_t count, int rw)
2258 {
2259         int i, cur = -1;
2260         struct ll_rw_process_info *process;
2261         struct ll_rw_process_info *offset;
2262         int *off_count = &sbi->ll_rw_offset_entry_count;
2263         int *process_count = &sbi->ll_offset_process_count;
2264         struct ll_rw_extents_info *rw_extents;
2265
2266         if (!sbi->ll_rw_stats_on)
2267                 return;
2268
2269         spin_lock(&sbi->ll_pp_extent_lock);
2270         rw_extents = sbi->ll_rw_extents_info;
2271         if (!rw_extents) {
2272                 spin_unlock(&sbi->ll_pp_extent_lock);
2273                 return;
2274         }
2275
2276         /* Extent statistics */
2277         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
2278                 if (rw_extents->pp_extents[i].pid == pid) {
2279                         cur = i;
2280                         break;
2281                 }
2282         }
2283
2284         if (cur == -1) {
2285                 /* new process */
2286                 sbi->ll_extent_process_count =
2287                         (sbi->ll_extent_process_count + 1) % LL_PROCESS_HIST_MAX;
2288                 cur = sbi->ll_extent_process_count;
2289                 rw_extents->pp_extents[cur].pid = pid;
2290                 lprocfs_oh_clear(&rw_extents->pp_extents[cur].pp_r_hist);
2291                 lprocfs_oh_clear(&rw_extents->pp_extents[cur].pp_w_hist);
2292         }
2293
2294         for (i = 0; (count >= 1 << (LL_HIST_START + i)) &&
2295              (i < (LL_HIST_MAX - 1)); i++);
2296         if (rw == 0) {
2297                 rw_extents->pp_extents[cur].pp_r_hist.oh_buckets[i]++;
2298                 rw_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_r_hist.oh_buckets[i]++;
2299         } else {
2300                 rw_extents->pp_extents[cur].pp_w_hist.oh_buckets[i]++;
2301                 rw_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_w_hist.oh_buckets[i]++;
2302         }
2303         spin_unlock(&sbi->ll_pp_extent_lock);
2304
2305         spin_lock(&sbi->ll_process_lock);
2306         process = sbi->ll_rw_process_info;
2307         offset = sbi->ll_rw_offset_info;
2308         if (!process || !offset)
2309                 goto out_unlock;
2310
2311         /* Offset statistics */
2312         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
2313                 if (process[i].rw_pid == pid) {
2314                         if (process[i].rw_last_file != file) {
2315                                 process[i].rw_range_start = pos;
2316                                 process[i].rw_last_file_pos = pos + count;
2317                                 process[i].rw_smallest_extent = count;
2318                                 process[i].rw_largest_extent = count;
2319                                 process[i].rw_offset = 0;
2320                                 process[i].rw_last_file = file;
2321                                 goto out_unlock;
2322                         }
2323                         if (process[i].rw_last_file_pos != pos) {
2324                                 *off_count =
2325                                     (*off_count + 1) % LL_OFFSET_HIST_MAX;
2326                                 offset[*off_count].rw_op = process[i].rw_op;
2327                                 offset[*off_count].rw_pid = pid;
2328                                 offset[*off_count].rw_range_start =
2329                                         process[i].rw_range_start;
2330                                 offset[*off_count].rw_range_end =
2331                                         process[i].rw_last_file_pos;
2332                                 offset[*off_count].rw_smallest_extent =
2333                                         process[i].rw_smallest_extent;
2334                                 offset[*off_count].rw_largest_extent =
2335                                         process[i].rw_largest_extent;
2336                                 offset[*off_count].rw_offset =
2337                                         process[i].rw_offset;
2338                                 process[i].rw_op = rw;
2339                                 process[i].rw_range_start = pos;
2340                                 process[i].rw_smallest_extent = count;
2341                                 process[i].rw_largest_extent = count;
2342                                 process[i].rw_offset = pos -
2343                                         process[i].rw_last_file_pos;
2344                         }
2345                         if (process[i].rw_smallest_extent > count)
2346                                 process[i].rw_smallest_extent = count;
2347                         if (process[i].rw_largest_extent < count)
2348                                 process[i].rw_largest_extent = count;
2349                         process[i].rw_last_file_pos = pos + count;
2350                         goto out_unlock;
2351                 }
2352         }
2353         *process_count = (*process_count + 1) % LL_PROCESS_HIST_MAX;
2354         process[*process_count].rw_pid = pid;
2355         process[*process_count].rw_op = rw;
2356         process[*process_count].rw_range_start = pos;
2357         process[*process_count].rw_last_file_pos = pos + count;
2358         process[*process_count].rw_smallest_extent = count;
2359         process[*process_count].rw_largest_extent = count;
2360         process[*process_count].rw_offset = 0;
2361         process[*process_count].rw_last_file = file;
2362
2363 out_unlock:
2364         spin_unlock(&sbi->ll_process_lock);
2365 }
2366
2367 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
2368 {
2369         struct ll_sb_info *sbi = seq->private;
2370         struct ll_rw_process_info *offset;
2371         struct ll_rw_process_info *process;
2372         int i;
2373
2374         if (!sbi->ll_rw_stats_on) {
2375                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
2376                 return 0;
2377         }
2378
2379         spin_lock(&sbi->ll_process_lock);
2380         lprocfs_stats_header(seq, ktime_get(), sbi->ll_process_stats_init, 25,
2381                              ":", true);
2382         seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
2383                    "R/W", "PID", "RANGE START", "RANGE END",
2384                    "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");
2385
2386         /* We stored the discontiguous offsets here; print them first */
2387         offset = sbi->ll_rw_offset_info;
2388         for (i = 0; offset && i < LL_OFFSET_HIST_MAX; i++) {
2389                 if (offset[i].rw_pid != 0)
2390                         seq_printf(seq,
2391                                   "%3c %10d %14llu %14llu %17lu %17lu %14lld\n",
2392                                    offset[i].rw_op == READ ? 'R' : 'W',
2393                                    offset[i].rw_pid,
2394                                    offset[i].rw_range_start,
2395                                    offset[i].rw_range_end,
2396                                    (unsigned long)offset[i].rw_smallest_extent,
2397                                    (unsigned long)offset[i].rw_largest_extent,
2398                                    offset[i].rw_offset);
2399         }
2400
2401         /* Then print the current offsets for each process */
2402         process = sbi->ll_rw_process_info;
2403         for (i = 0; process && i < LL_PROCESS_HIST_MAX; i++) {
2404                 if (process[i].rw_pid != 0)
2405                         seq_printf(seq,
2406                                   "%3c %10d %14llu %14llu %17lu %17lu %14lld\n",
2407                                    process[i].rw_op == READ ? 'R' : 'W',
2408                                    process[i].rw_pid,
2409                                    process[i].rw_range_start,
2410                                    process[i].rw_last_file_pos,
2411                                    (unsigned long)process[i].rw_smallest_extent,
2412                                    (unsigned long)process[i].rw_largest_extent,
2413                                    process[i].rw_offset);
2414         }
2415         spin_unlock(&sbi->ll_process_lock);
2416
2417         return 0;
2418 }
2419
2420 static ssize_t ll_rw_offset_stats_seq_write(struct file *file,
2421                                             const char __user *buf,
2422                                             size_t len, loff_t *off)
2423 {
2424         struct seq_file *seq = file->private_data;
2425         struct ll_sb_info *sbi = seq->private;
2426         __s64 value;
2427
2428         if (len == 0)
2429                 return -EINVAL;
2430
2431         value = ll_stats_pid_write(buf, len);
2432
2433         if (value == 0) {
2434                 sbi->ll_rw_stats_on = 0;
2435         } else {
2436                 if (!sbi->ll_rw_process_info || !sbi->ll_rw_offset_info) {
2437                         int rc = alloc_rw_stats_info(sbi);
2438
2439                         if (rc)
2440                                 return rc;
2441                 }
2442                 sbi->ll_rw_stats_on = 1;
2443         }
2444
2445         spin_lock(&sbi->ll_process_lock);
2446         sbi->ll_offset_process_count = 0;
2447         sbi->ll_rw_offset_entry_count = 0;
2448         sbi->ll_process_stats_init = ktime_get();
2449         if (sbi->ll_rw_process_info)
2450                 memset(sbi->ll_rw_process_info, 0,
2451                        sizeof(struct ll_rw_process_info) * LL_PROCESS_HIST_MAX);
2452         if (sbi->ll_rw_offset_info)
2453                 memset(sbi->ll_rw_offset_info, 0,
2454                        sizeof(struct ll_rw_process_info) * LL_OFFSET_HIST_MAX);
2455         spin_unlock(&sbi->ll_process_lock);
2456
2457         return len;
2458 }
2459
2460 LDEBUGFS_SEQ_FOPS(ll_rw_offset_stats);