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  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32 #define DEBUG_SUBSYSTEM S_LLITE
  33
  34 #include <linux/version.h>
  35 #include <linux/user_namespace.h>
  36 #ifdef HAVE_UIDGID_HEADER
  37 # include <linux/uidgid.h>
  38 #endif
  39 #include <uapi/linux/lustre/lustre_param.h>
  40 #include <lprocfs_status.h>
  41 #include <obd_support.h>
  42
  43 #include "llite_internal.h"
  44 #include "vvp_internal.h"
  45
  46 static struct kobject *llite_kobj;
  47 static struct dentry *llite_root;
  48
  49 int llite_tunables_register(void)
  50 {
  51         int rc = 0;
  52
  53         llite_kobj = class_setup_tunables("llite");
  54         if (IS_ERR(llite_kobj))
  55                 return PTR_ERR(llite_kobj);
  56
  57         llite_root = debugfs_create_dir("llite", debugfs_lustre_root);
  58         if (IS_ERR_OR_NULL(llite_root)) {
  59                 rc = llite_root ? PTR_ERR(llite_root) : -ENOMEM;
  60                 llite_root = NULL;
  61                 kobject_put(llite_kobj);
  62                 llite_kobj = NULL;
  63         }
  64
  65         return rc;
  66 }
  67
  68 void llite_tunables_unregister(void)
  69 {
  70         if (llite_kobj) {
  71                 kobject_put(llite_kobj);
  72                 llite_kobj = NULL;
  73         }
  74
  75         if (!IS_ERR_OR_NULL(llite_root)) {
  76                 debugfs_remove(llite_root);
  77                 llite_root = NULL;
  78         }
  79 }
  80
  81 /* <debugfs>/lustre/llite mount point registration */
  82 static const struct file_operations ll_rw_extents_stats_fops;
  83 static const struct file_operations ll_rw_extents_stats_pp_fops;
  84 static const struct file_operations ll_rw_offset_stats_fops;
  85
  86 /**
  87  * ll_stats_pid_write() - Determine if stats collection should be enabled
  88  * @buf: Buffer containing the data written
  89  * @len: Number of bytes in the buffer
  90  *
  91  * Several proc files begin collecting stats when a value is written, and stop
  92  * collecting when either '0' or 'disable' is written. This function checks the
  93  * written value to see if collection should be enabled or disabled.
  94  *
  95  * Return: If '0' or 'disable' is provided, 0 is returned. If the text
  96  * equivalent of a number is written, that number is returned. Otherwise,
  97  * 1 is returned. Non-zero return values indicate collection should be enabled.
  98  */
  99 static s64 ll_stats_pid_write(const char __user *buf, size_t len)
 100 {
 101         unsigned long long value = 1;
 102         char kernbuf[16];
 103         int rc;
 104
 105         rc = kstrtoull_from_user(buf, len, 0, &value);
 106         if (rc < 0 && len < sizeof(kernbuf)) {
 107                 if (copy_from_user(kernbuf, buf, len))
 108                         return -EFAULT;
 109                 kernbuf[len] = 0;
 110
 111                 if (kernbuf[len - 1] == '\n')
 112                         kernbuf[len - 1] = 0;
 113
 114                 if (strncasecmp(kernbuf, "disable", 7) == 0)
 115                         value = 0;
 116         }
 117
 118         return value;
 119 }
 120
 121 static ssize_t blocksize_show(struct kobject *kobj, struct attribute *attr,
 122                               char *buf)
 123 {
 124         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 125                                               ll_kset.kobj);
 126         struct obd_statfs osfs;
 127         int rc;
 128
 129         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 130         if (rc)
 131                 return rc;
 132
 133         return sprintf(buf, "%u\n", osfs.os_bsize);
 134 }
 135 LUSTRE_RO_ATTR(blocksize);
 136
 137 static ssize_t stat_blocksize_show(struct kobject *kobj, struct attribute *attr,
 138                                    char *buf)
 139 {
 140         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 141                                               ll_kset.kobj);
 142
 143         return sprintf(buf, "%u\n", sbi->ll_stat_blksize);
 144 }
 145
 146 static ssize_t stat_blocksize_store(struct kobject *kobj,
 147                                     struct attribute *attr,
 148                                     const char *buffer,
 149                                     size_t count)
 150 {
 151         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 152                                               ll_kset.kobj);
 153         unsigned int val;
 154         int rc;
 155
 156         rc = kstrtouint(buffer, 10, &val);
 157         if (rc)
 158                 return rc;
 159
 160         if (val != 0 && (val < PAGE_SIZE || (val & (val - 1))) != 0)
 161                 return -ERANGE;
 162
 163         sbi->ll_stat_blksize = val;
 164
 165         return count;
 166 }
 167 LUSTRE_RW_ATTR(stat_blocksize);
 168
 169 static ssize_t kbytestotal_show(struct kobject *kobj, struct attribute *attr,
 170                                 char *buf)
 171 {
 172         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 173                                               ll_kset.kobj);
 174         struct obd_statfs osfs;
 175         u32 blk_size;
 176         u64 result;
 177         int rc;
 178
 179         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 180         if (rc)
 181                 return rc;
 182
 183         blk_size = osfs.os_bsize >> 10;
 184         result = osfs.os_blocks;
 185
 186         while (blk_size >>= 1)
 187                 result <<= 1;
 188
 189         return sprintf(buf, "%llu\n", result);
 190 }
 191 LUSTRE_RO_ATTR(kbytestotal);
 192
 193 static ssize_t kbytesfree_show(struct kobject *kobj, struct attribute *attr,
 194                                char *buf)
 195 {
 196         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 197                                               ll_kset.kobj);
 198         struct obd_statfs osfs;
 199         u32 blk_size;
 200         u64 result;
 201         int rc;
 202
 203         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 204         if (rc)
 205                 return rc;
 206
 207         blk_size = osfs.os_bsize >> 10;
 208         result = osfs.os_bfree;
 209
 210         while (blk_size >>= 1)
 211                 result <<= 1;
 212
 213         return sprintf(buf, "%llu\n", result);
 214 }
 215 LUSTRE_RO_ATTR(kbytesfree);
 216
 217 static ssize_t kbytesavail_show(struct kobject *kobj, struct attribute *attr,
 218                                 char *buf)
 219 {
 220         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 221                                               ll_kset.kobj);
 222         struct obd_statfs osfs;
 223         u32 blk_size;
 224         u64 result;
 225         int rc;
 226
 227         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 228         if (rc)
 229                 return rc;
 230
 231         blk_size = osfs.os_bsize >> 10;
 232         result = osfs.os_bavail;
 233
 234         while (blk_size >>= 1)
 235                 result <<= 1;
 236
 237         return sprintf(buf, "%llu\n", result);
 238 }
 239 LUSTRE_RO_ATTR(kbytesavail);
 240
 241 static ssize_t filestotal_show(struct kobject *kobj, struct attribute *attr,
 242                                char *buf)
 243 {
 244         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 245                                               ll_kset.kobj);
 246         struct obd_statfs osfs;
 247         int rc;
 248
 249         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 250         if (rc)
 251                 return rc;
 252
 253         return sprintf(buf, "%llu\n", osfs.os_files);
 254 }
 255 LUSTRE_RO_ATTR(filestotal);
 256
 257 static ssize_t filesfree_show(struct kobject *kobj, struct attribute *attr,
 258                               char *buf)
 259 {
 260         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 261                                               ll_kset.kobj);
 262         struct obd_statfs osfs;
 263         int rc;
 264
 265         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 266         if (rc)
 267                 return rc;
 268
 269         return sprintf(buf, "%llu\n", osfs.os_ffree);
 270 }
 271 LUSTRE_RO_ATTR(filesfree);
 272
 273 static ssize_t client_type_show(struct kobject *kobj, struct attribute *attr,
 274                                 char *buf)
 275 {
 276         return sprintf(buf, "local client\n");
 277 }
 278 LUSTRE_RO_ATTR(client_type);
 279
 280 static ssize_t fstype_show(struct kobject *kobj, struct attribute *attr,
 281                            char *buf)
 282 {
 283         return sprintf(buf, "lustre\n");
 284 }
 285 LUSTRE_RO_ATTR(fstype);
 286
 287 static ssize_t uuid_show(struct kobject *kobj, struct attribute *attr,
 288                          char *buf)
 289 {
 290         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 291                                               ll_kset.kobj);
 292
 293         return sprintf(buf, "%s\n", sbi->ll_sb_uuid.uuid);
 294 }
 295 LUSTRE_RO_ATTR(uuid);
 296
 297 static int ll_site_stats_seq_show(struct seq_file *m, void *v)
 298 {
 299         struct super_block *sb = m->private;
 300
 301         /*
 302          * See description of statistical counters in struct cl_site, and
 303          * struct lu_site.
 304          */
 305         return cl_site_stats_print(lu2cl_site(ll_s2sbi(sb)->ll_site), m);
 306 }
 307
 308 LDEBUGFS_SEQ_FOPS_RO(ll_site_stats);
 309
 310 static int ll_max_readahead_mb_seq_show(struct seq_file *m, void *v)
 311 {
 312         struct super_block *sb = m->private;
 313         struct ll_sb_info *sbi = ll_s2sbi(sb);
 314         long pages_number;
 315         int mult;
 316
 317         spin_lock(&sbi->ll_lock);
 318         pages_number = sbi->ll_ra_info.ra_max_pages;
 319         spin_unlock(&sbi->ll_lock);
 320
 321         mult = 1 << (20 - PAGE_SHIFT);
 322         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 323 }
 324
 325 static ssize_t
 326 ll_max_readahead_mb_seq_write(struct file *file, const char __user *buffer,
 327                               size_t count, loff_t *off)
 328 {
 329         struct seq_file *m = file->private_data;
 330         struct super_block *sb = m->private;
 331         struct ll_sb_info *sbi = ll_s2sbi(sb);
 332         __s64 pages_number;
 333         int rc;
 334
 335         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 336         if (rc)
 337                 return rc;
 338
 339         pages_number >>= PAGE_SHIFT;
 340
 341         if (pages_number < 0 || pages_number > totalram_pages / 2) {
 342                 /* 1/2 of RAM */
 343                 CERROR("%s: can't set max_readahead_mb=%lu > %luMB\n",
 344                        ll_get_fsname(sb, NULL, 0),
 345                        (unsigned long)pages_number >> (20 - PAGE_SHIFT),
 346                        totalram_pages >> (20 - PAGE_SHIFT + 1));
 347                 return -ERANGE;
 348         }
 349
 350         spin_lock(&sbi->ll_lock);
 351         sbi->ll_ra_info.ra_max_pages = pages_number;
 352         spin_unlock(&sbi->ll_lock);
 353
 354         return count;
 355 }
 356
 357 LDEBUGFS_SEQ_FOPS(ll_max_readahead_mb);
 358
 359 static int ll_max_readahead_per_file_mb_seq_show(struct seq_file *m, void *v)
 360 {
 361         struct super_block *sb = m->private;
 362         struct ll_sb_info *sbi = ll_s2sbi(sb);
 363         long pages_number;
 364         int mult;
 365
 366         spin_lock(&sbi->ll_lock);
 367         pages_number = sbi->ll_ra_info.ra_max_pages_per_file;
 368         spin_unlock(&sbi->ll_lock);
 369
 370         mult = 1 << (20 - PAGE_SHIFT);
 371         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 372 }
 373
 374 static ssize_t
 375 ll_max_readahead_per_file_mb_seq_write(struct file *file,
 376                                        const char __user *buffer,
 377                                        size_t count, loff_t *off)
 378 {
 379         struct seq_file *m = file->private_data;
 380         struct super_block *sb = m->private;
 381         struct ll_sb_info *sbi = ll_s2sbi(sb);
 382         int rc;
 383         __s64 pages_number;
 384
 385         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 386         if (rc)
 387                 return rc;
 388
 389         pages_number >>= PAGE_SHIFT;
 390
 391         if (pages_number < 0 || pages_number > sbi->ll_ra_info.ra_max_pages) {
 392                 CERROR("%s: can't set max_readahead_per_file_mb=%lu > "
 393                        "max_read_ahead_mb=%lu\n", ll_get_fsname(sb, NULL, 0),
 394                        (unsigned long)pages_number >> (20 - PAGE_SHIFT),
 395                        sbi->ll_ra_info.ra_max_pages >> (20 - PAGE_SHIFT));
 396                 return -ERANGE;
 397         }
 398
 399         spin_lock(&sbi->ll_lock);
 400         sbi->ll_ra_info.ra_max_pages_per_file = pages_number;
 401         spin_unlock(&sbi->ll_lock);
 402
 403         return count;
 404 }
 405
 406 LDEBUGFS_SEQ_FOPS(ll_max_readahead_per_file_mb);
 407
 408 static int ll_max_read_ahead_whole_mb_seq_show(struct seq_file *m, void *v)
 409 {
 410         struct super_block *sb = m->private;
 411         struct ll_sb_info *sbi = ll_s2sbi(sb);
 412         long pages_number;
 413         int mult;
 414
 415         spin_lock(&sbi->ll_lock);
 416         pages_number = sbi->ll_ra_info.ra_max_read_ahead_whole_pages;
 417         spin_unlock(&sbi->ll_lock);
 418
 419         mult = 1 << (20 - PAGE_SHIFT);
 420         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 421 }
 422
 423 static ssize_t
 424 ll_max_read_ahead_whole_mb_seq_write(struct file *file,
 425                                      const char __user *buffer,
 426                                      size_t count, loff_t *off)
 427 {
 428         struct seq_file *m = file->private_data;
 429         struct super_block *sb = m->private;
 430         struct ll_sb_info *sbi = ll_s2sbi(sb);
 431         int rc;
 432         __s64 pages_number;
 433
 434         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 435         if (rc)
 436                 return rc;
 437
 438         pages_number >>= PAGE_SHIFT;
 439
 440         /* Cap this at the current max readahead window size, the readahead
 441          * algorithm does this anyway so it's pointless to set it larger. */
 442         if (pages_number < 0 ||
 443             pages_number > sbi->ll_ra_info.ra_max_pages_per_file) {
 444                 int pages_shift = 20 - PAGE_SHIFT;
 445                 CERROR("%s: can't set max_read_ahead_whole_mb=%lu > "
 446                        "max_read_ahead_per_file_mb=%lu\n",
 447                        ll_get_fsname(sb, NULL, 0),
 448                        (unsigned long)pages_number >> pages_shift,
 449                        sbi->ll_ra_info.ra_max_pages_per_file >> pages_shift);
 450                 return -ERANGE;
 451         }
 452
 453         spin_lock(&sbi->ll_lock);
 454         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = pages_number;
 455         spin_unlock(&sbi->ll_lock);
 456
 457         return count;
 458 }
 459
 460 LDEBUGFS_SEQ_FOPS(ll_max_read_ahead_whole_mb);
 461
 462 static int ll_max_cached_mb_seq_show(struct seq_file *m, void *v)
 463 {
 464         struct super_block     *sb    = m->private;
 465         struct ll_sb_info      *sbi   = ll_s2sbi(sb);
 466         struct cl_client_cache *cache = sbi->ll_cache;
 467         int shift = 20 - PAGE_SHIFT;
 468         long max_cached_mb;
 469         long unused_mb;
 470
 471         max_cached_mb = cache->ccc_lru_max >> shift;
 472         unused_mb = atomic_long_read(&cache->ccc_lru_left) >> shift;
 473         seq_printf(m, "users: %d\n"
 474                       "max_cached_mb: %ld\n"
 475                       "used_mb: %ld\n"
 476                       "unused_mb: %ld\n"
 477                       "reclaim_count: %u\n",
 478                    atomic_read(&cache->ccc_users),
 479                    max_cached_mb,
 480                    max_cached_mb - unused_mb,
 481                    unused_mb,
 482                    cache->ccc_lru_shrinkers);
 483         return 0;
 484 }
 485
 486 static ssize_t ll_max_cached_mb_seq_write(struct file *file,
 487                                           const char __user *buffer,
 488                                           size_t count, loff_t *off)
 489 {
 490         struct seq_file *m = file->private_data;
 491         struct super_block *sb = m->private;
 492         struct ll_sb_info *sbi = ll_s2sbi(sb);
 493         struct cl_client_cache *cache = sbi->ll_cache;
 494         struct lu_env *env;
 495         long diff = 0;
 496         long nrpages = 0;
 497         __u16 refcheck;
 498         __s64 pages_number;
 499         int rc;
 500         char kernbuf[128];
 501
 502         ENTRY;
 503         if (count >= sizeof(kernbuf))
 504                 RETURN(-EINVAL);
 505
 506         if (copy_from_user(kernbuf, buffer, count))
 507                 RETURN(-EFAULT);
 508         kernbuf[count] = 0;
 509
 510         buffer += lprocfs_find_named_value(kernbuf, "max_cached_mb:", &count) -
 511                   kernbuf;
 512         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 513         if (rc)
 514                 RETURN(rc);
 515
 516         pages_number >>= PAGE_SHIFT;
 517
 518         if (pages_number < 0 || pages_number > totalram_pages) {
 519                 CERROR("%s: can't set max cache more than %lu MB\n",
 520                        ll_get_fsname(sb, NULL, 0),
 521                        totalram_pages >> (20 - PAGE_SHIFT));
 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         spin_lock(&sbi->ll_lock);
 528         diff = pages_number - cache->ccc_lru_max;
 529         spin_unlock(&sbi->ll_lock);
 530
 531         /* easy - add more LRU slots. */
 532         if (diff >= 0) {
 533                 atomic_long_add(diff, &cache->ccc_lru_left);
 534                 GOTO(out, rc = 0);
 535         }
 536
 537         env = cl_env_get(&refcheck);
 538         if (IS_ERR(env))
 539                 RETURN(PTR_ERR(env));
 540
 541         diff = -diff;
 542         while (diff > 0) {
 543                 long tmp;
 544
 545                 /* reduce LRU budget from free slots. */
 546                 do {
 547                         long ov, nv;
 548
 549                         ov = atomic_long_read(&cache->ccc_lru_left);
 550                         if (ov == 0)
 551                                 break;
 552
 553                         nv = ov > diff ? ov - diff : 0;
 554                         rc = atomic_long_cmpxchg(&cache->ccc_lru_left, ov, nv);
 555                         if (likely(ov == rc)) {
 556                                 diff -= ov - nv;
 557                                 nrpages += ov - nv;
 558                                 break;
 559                         }
 560                 } while (1);
 561
 562                 if (diff <= 0)
 563                         break;
 564
 565                 if (sbi->ll_dt_exp == NULL) { /* being initialized */
 566                         rc = -ENODEV;
 567                         break;
 568                 }
 569
 570                 /* difficult - have to ask OSCs to drop LRU slots. */
 571                 tmp = diff << 1;
 572                 rc = obd_set_info_async(env, sbi->ll_dt_exp,
 573                                 sizeof(KEY_CACHE_LRU_SHRINK),
 574                                 KEY_CACHE_LRU_SHRINK,
 575                                 sizeof(tmp), &tmp, NULL);
 576                 if (rc < 0)
 577                         break;
 578         }
 579         cl_env_put(env, &refcheck);
 580
 581 out:
 582         if (rc >= 0) {
 583                 spin_lock(&sbi->ll_lock);
 584                 cache->ccc_lru_max = pages_number;
 585                 spin_unlock(&sbi->ll_lock);
 586                 rc = count;
 587         } else {
 588                 atomic_long_add(nrpages, &cache->ccc_lru_left);
 589         }
 590         return rc;
 591 }
 592
 593 LDEBUGFS_SEQ_FOPS(ll_max_cached_mb);
 594
 595 static ssize_t checksums_show(struct kobject *kobj, struct attribute *attr,
 596                               char *buf)
 597 {
 598         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 599                                               ll_kset.kobj);
 600
 601         return sprintf(buf, "%u\n", (sbi->ll_flags & LL_SBI_CHECKSUM) ? 1 : 0);
 602 }
 603
 604 static ssize_t checksums_store(struct kobject *kobj, struct attribute *attr,
 605                                const char *buffer, size_t count)
 606 {
 607         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 608                                               ll_kset.kobj);
 609         bool val;
 610         int tmp;
 611         int rc;
 612
 613         if (!sbi->ll_dt_exp)
 614                 /* Not set up yet */
 615                 return -EAGAIN;
 616
 617         rc = kstrtobool(buffer, &val);
 618         if (rc)
 619                 return rc;
 620         if (val)
 621                 sbi->ll_flags |= LL_SBI_CHECKSUM;
 622         else
 623                 sbi->ll_flags &= ~LL_SBI_CHECKSUM;
 624         tmp = val;
 625
 626         rc = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 627                                 KEY_CHECKSUM, sizeof(tmp), &tmp, NULL);
 628         if (rc)
 629                 CWARN("Failed to set OSC checksum flags: %d\n", rc);
 630
 631         return count;
 632 }
 633 LUSTRE_RW_ATTR(checksums);
 634
 635 LUSTRE_ATTR(checksum_pages, 0644, checksums_show, checksums_store);
 636
 637 static ssize_t ll_rd_track_id(struct kobject *kobj, char *buf,
 638                               enum stats_track_type type)
 639 {
 640         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 641                                               ll_kset.kobj);
 642
 643         if (sbi->ll_stats_track_type == type)
 644                 return sprintf(buf, "%d\n", sbi->ll_stats_track_id);
 645         else if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
 646                 return sprintf(buf, "0 (all)\n");
 647
 648         return sprintf(buf, "untracked\n");
 649 }
 650
 651 static ssize_t ll_wr_track_id(struct kobject *kobj, const char *buffer,
 652                               size_t count, enum stats_track_type type)
 653 {
 654         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 655                                               ll_kset.kobj);
 656         unsigned long pid;
 657         int rc;
 658
 659         rc = kstrtoul(buffer, 10, &pid);
 660         if (rc)
 661                 return rc;
 662
 663         sbi->ll_stats_track_id = pid;
 664         if (pid == 0)
 665                 sbi->ll_stats_track_type = STATS_TRACK_ALL;
 666         else
 667                 sbi->ll_stats_track_type = type;
 668         lprocfs_clear_stats(sbi->ll_stats);
 669         return count;
 670 }
 671
 672 static ssize_t stats_track_pid_show(struct kobject *kobj,
 673                                     struct attribute *attr,
 674                                     char *buf)
 675 {
 676         return ll_rd_track_id(kobj, buf, STATS_TRACK_PID);
 677 }
 678
 679 static ssize_t stats_track_pid_store(struct kobject *kobj,
 680                                      struct attribute *attr,
 681                                      const char *buffer,
 682                                      size_t count)
 683 {
 684         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_PID);
 685 }
 686 LUSTRE_RW_ATTR(stats_track_pid);
 687
 688 static ssize_t stats_track_ppid_show(struct kobject *kobj,
 689                                      struct attribute *attr,
 690                                      char *buf)
 691 {
 692         return ll_rd_track_id(kobj, buf, STATS_TRACK_PPID);
 693 }
 694
 695 static ssize_t stats_track_ppid_store(struct kobject *kobj,
 696                                       struct attribute *attr,
 697                                       const char *buffer,
 698                                       size_t count)
 699 {
 700         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_PPID);
 701 }
 702 LUSTRE_RW_ATTR(stats_track_ppid);
 703
 704 static ssize_t stats_track_gid_show(struct kobject *kobj,
 705                                     struct attribute *attr,
 706                                     char *buf)
 707 {
 708         return ll_rd_track_id(kobj, buf, STATS_TRACK_GID);
 709 }
 710
 711 static ssize_t stats_track_gid_store(struct kobject *kobj,
 712                                      struct attribute *attr,
 713                                      const char *buffer,
 714                                      size_t count)
 715 {
 716         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_GID);
 717 }
 718 LUSTRE_RW_ATTR(stats_track_gid);
 719
 720 static ssize_t statahead_running_max_show(struct kobject *kobj,
 721                                           struct attribute *attr,
 722                                           char *buf)
 723 {
 724         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 725                                               ll_kset.kobj);
 726
 727         return snprintf(buf, 16, "%u\n", sbi->ll_sa_running_max);
 728 }
 729
 730 static ssize_t statahead_running_max_store(struct kobject *kobj,
 731                                            struct attribute *attr,
 732                                            const char *buffer,
 733                                            size_t count)
 734 {
 735         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 736                                               ll_kset.kobj);
 737         unsigned long val;
 738         int rc;
 739
 740         rc = kstrtoul(buffer, 0, &val);
 741         if (rc)
 742                 return rc;
 743
 744         if (val <= LL_SA_RUNNING_MAX) {
 745                 sbi->ll_sa_running_max = val;
 746                 return count;
 747         }
 748
 749         CERROR("Bad statahead_running_max value %lu. Valid values "
 750                "are in the range [0, %d]\n", val, LL_SA_RUNNING_MAX);
 751
 752         return -ERANGE;
 753 }
 754 LUSTRE_RW_ATTR(statahead_running_max);
 755
 756 static ssize_t statahead_max_show(struct kobject *kobj,
 757                                   struct attribute *attr,
 758                                   char *buf)
 759 {
 760         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 761                                               ll_kset.kobj);
 762
 763         return sprintf(buf, "%u\n", sbi->ll_sa_max);
 764 }
 765
 766 static ssize_t statahead_max_store(struct kobject *kobj,
 767                                    struct attribute *attr,
 768                                    const char *buffer,
 769                                    size_t count)
 770 {
 771         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 772                                               ll_kset.kobj);
 773         unsigned long val;
 774         int rc;
 775
 776         rc = kstrtoul(buffer, 0, &val);
 777         if (rc)
 778                 return rc;
 779
 780         if (val <= LL_SA_RPC_MAX)
 781                 sbi->ll_sa_max = val;
 782         else
 783                 CERROR("Bad statahead_max value %lu. Valid values are in the range [0, %d]\n",
 784                        val, LL_SA_RPC_MAX);
 785
 786         return count;
 787 }
 788 LUSTRE_RW_ATTR(statahead_max);
 789
 790 static ssize_t statahead_agl_show(struct kobject *kobj,
 791                                   struct attribute *attr,
 792                                   char *buf)
 793 {
 794         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 795                                               ll_kset.kobj);
 796
 797         return sprintf(buf, "%u\n", sbi->ll_flags & LL_SBI_AGL_ENABLED ? 1 : 0);
 798 }
 799
 800 static ssize_t statahead_agl_store(struct kobject *kobj,
 801                                    struct attribute *attr,
 802                                    const char *buffer,
 803                                    size_t count)
 804 {
 805         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 806                                               ll_kset.kobj);
 807         bool val;
 808         int rc;
 809
 810         rc = kstrtobool(buffer, &val);
 811         if (rc)
 812                 return rc;
 813
 814         if (val)
 815                 sbi->ll_flags |= LL_SBI_AGL_ENABLED;
 816         else
 817                 sbi->ll_flags &= ~LL_SBI_AGL_ENABLED;
 818
 819         return count;
 820 }
 821 LUSTRE_RW_ATTR(statahead_agl);
 822
 823 static int ll_statahead_stats_seq_show(struct seq_file *m, void *v)
 824 {
 825         struct super_block *sb = m->private;
 826         struct ll_sb_info *sbi = ll_s2sbi(sb);
 827
 828         seq_printf(m, "statahead total: %u\n"
 829                       "statahead wrong: %u\n"
 830                       "agl total: %u\n",
 831                    atomic_read(&sbi->ll_sa_total),
 832                    atomic_read(&sbi->ll_sa_wrong),
 833                    atomic_read(&sbi->ll_agl_total));
 834         return 0;
 835 }
 836
 837 LDEBUGFS_SEQ_FOPS_RO(ll_statahead_stats);
 838
 839 static ssize_t lazystatfs_show(struct kobject *kobj,
 840                                struct attribute *attr,
 841                                char *buf)
 842 {
 843         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 844                                               ll_kset.kobj);
 845
 846         return sprintf(buf, "%u\n", (sbi->ll_flags & LL_SBI_LAZYSTATFS) ? 1 : 0);
 847 }
 848
 849 static ssize_t lazystatfs_store(struct kobject *kobj,
 850                                 struct attribute *attr,
 851                                 const char *buffer,
 852                                 size_t count)
 853 {
 854         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 855                                               ll_kset.kobj);
 856         bool val;
 857         int rc;
 858
 859         rc = kstrtobool(buffer, &val);
 860         if (rc)
 861                 return rc;
 862
 863         if (val)
 864                 sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 865         else
 866                 sbi->ll_flags &= ~LL_SBI_LAZYSTATFS;
 867
 868         return count;
 869 }
 870 LUSTRE_RW_ATTR(lazystatfs);
 871
 872 static ssize_t max_easize_show(struct kobject *kobj,
 873                                struct attribute *attr,
 874                                char *buf)
 875 {
 876         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 877                                               ll_kset.kobj);
 878         unsigned int ealen;
 879         int rc;
 880
 881         rc = ll_get_max_mdsize(sbi, &ealen);
 882         if (rc)
 883                 return rc;
 884
 885         return sprintf(buf, "%u\n", ealen);
 886 }
 887 LUSTRE_RO_ATTR(max_easize);
 888
 889 /**
 890  * Get default_easize.
 891  *
 892  * \see client_obd::cl_default_mds_easize
 893  *
 894  * \param[in] m         seq_file handle
 895  * \param[in] v         unused for single entry
 896  *
 897  * \retval 0            on success
 898  * \retval negative     negated errno on failure
 899  */
 900 static ssize_t default_easize_show(struct kobject *kobj,
 901                                    struct attribute *attr,
 902                                    char *buf)
 903 {
 904         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 905                                               ll_kset.kobj);
 906         unsigned int ealen;
 907         int rc;
 908
 909         rc = ll_get_default_mdsize(sbi, &ealen);
 910         if (rc)
 911                 return rc;
 912
 913         return sprintf(buf, "%u\n", ealen);
 914 }
 915
 916 /**
 917  * Set default_easize.
 918  *
 919  * Range checking on the passed value is handled by
 920  * ll_set_default_mdsize().
 921  *
 922  * \see client_obd::cl_default_mds_easize
 923  *
 924  * \param[in] file      proc file
 925  * \param[in] buffer    string passed from user space
 926  * \param[in] count     \a buffer length
 927  * \param[in] off       unused for single entry
 928  *
 929  * \retval positive     \a count on success
 930  * \retval negative     negated errno on failure
 931  */
 932 static ssize_t default_easize_store(struct kobject *kobj,
 933                                     struct attribute *attr,
 934                                     const char *buffer,
 935                                     size_t count)
 936 {
 937         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 938                                               ll_kset.kobj);
 939         unsigned int val;
 940         int rc;
 941
 942         if (count == 0)
 943                 return 0;
 944
 945         rc = kstrtouint(buffer, 10, &val);
 946         if (rc)
 947                 return rc;
 948
 949         rc = ll_set_default_mdsize(sbi, val);
 950         if (rc)
 951                 return rc;
 952
 953         return count;
 954 }
 955 LUSTRE_RW_ATTR(default_easize);
 956
 957 static int ll_sbi_flags_seq_show(struct seq_file *m, void *v)
 958 {
 959         const char *str[] = LL_SBI_FLAGS;
 960         struct super_block *sb = m->private;
 961         int flags = ll_s2sbi(sb)->ll_flags;
 962         int i = 0;
 963
 964         while (flags != 0) {
 965                 if (ARRAY_SIZE(str) <= i) {
 966                         CERROR("%s: Revise array LL_SBI_FLAGS to match sbi "
 967                                 "flags please.\n", ll_get_fsname(sb, NULL, 0));
 968                         return -EINVAL;
 969                 }
 970
 971                 if (flags & 0x1)
 972                         seq_printf(m, "%s ", str[i]);
 973                 flags >>= 1;
 974                 ++i;
 975         }
 976         seq_printf(m, "\b\n");
 977         return 0;
 978 }
 979
 980 LDEBUGFS_SEQ_FOPS_RO(ll_sbi_flags);
 981
 982 static ssize_t xattr_cache_show(struct kobject *kobj,
 983                                 struct attribute *attr,
 984                                 char *buf)
 985 {
 986         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 987                                               ll_kset.kobj);
 988
 989         return sprintf(buf, "%u\n", sbi->ll_xattr_cache_enabled);
 990 }
 991
 992 static ssize_t xattr_cache_store(struct kobject *kobj,
 993                                  struct attribute *attr,
 994                                  const char *buffer,
 995                                  size_t count)
 996 {
 997         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 998                                               ll_kset.kobj);
 999         bool val;
1000         int rc;
1001
1002         rc = kstrtobool(buffer, &val);
1003         if (rc)
1004                 return rc;
1005
1006         if (val && !(sbi->ll_flags & LL_SBI_XATTR_CACHE))
1007                 return -ENOTSUPP;
1008
1009         sbi->ll_xattr_cache_enabled = val;
1010         sbi->ll_xattr_cache_set = 1;
1011
1012         return count;
1013 }
1014 LUSTRE_RW_ATTR(xattr_cache);
1015
1016 static ssize_t tiny_write_show(struct kobject *kobj,
1017                                struct attribute *attr,
1018                                char *buf)
1019 {
1020         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1021                                               ll_kset.kobj);
1022
1023         return sprintf(buf, "%u\n", !!(sbi->ll_flags & LL_SBI_TINY_WRITE));
1024 }
1025
1026 static ssize_t tiny_write_store(struct kobject *kobj,
1027                                 struct attribute *attr,
1028                                 const char *buffer,
1029                                 size_t count)
1030 {
1031         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1032                                               ll_kset.kobj);
1033         bool val;
1034         int rc;
1035
1036         rc = kstrtobool(buffer, &val);
1037         if (rc)
1038                 return rc;
1039
1040         spin_lock(&sbi->ll_lock);
1041         if (val)
1042                 sbi->ll_flags |= LL_SBI_TINY_WRITE;
1043         else
1044                 sbi->ll_flags &= ~LL_SBI_TINY_WRITE;
1045         spin_unlock(&sbi->ll_lock);
1046
1047         return count;
1048 }
1049 LUSTRE_RW_ATTR(tiny_write);
1050
1051 static ssize_t fast_read_show(struct kobject *kobj,
1052                               struct attribute *attr,
1053                               char *buf)
1054 {
1055         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1056                                               ll_kset.kobj);
1057
1058         return sprintf(buf, "%u\n", !!(sbi->ll_flags & LL_SBI_FAST_READ));
1059 }
1060
1061 static ssize_t fast_read_store(struct kobject *kobj,
1062                                struct attribute *attr,
1063                                const char *buffer,
1064                                size_t count)
1065 {
1066         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1067                                               ll_kset.kobj);
1068         bool val;
1069         int rc;
1070
1071         rc = kstrtobool(buffer, &val);
1072         if (rc)
1073                 return rc;
1074
1075         spin_lock(&sbi->ll_lock);
1076         if (val)
1077                 sbi->ll_flags |= LL_SBI_FAST_READ;
1078         else
1079                 sbi->ll_flags &= ~LL_SBI_FAST_READ;
1080         spin_unlock(&sbi->ll_lock);
1081
1082         return count;
1083 }
1084 LUSTRE_RW_ATTR(fast_read);
1085
1086 static int ll_unstable_stats_seq_show(struct seq_file *m, void *v)
1087 {
1088         struct super_block      *sb    = m->private;
1089         struct ll_sb_info       *sbi   = ll_s2sbi(sb);
1090         struct cl_client_cache  *cache = sbi->ll_cache;
1091         long pages;
1092         int mb;
1093
1094         pages = atomic_long_read(&cache->ccc_unstable_nr);
1095         mb    = (pages * PAGE_SIZE) >> 20;
1096
1097         seq_printf(m, "unstable_check:     %8d\n"
1098                       "unstable_pages: %12ld\n"
1099                       "unstable_mb:        %8d\n",
1100                    cache->ccc_unstable_check, pages, mb);
1101         return 0;
1102 }
1103
1104 static ssize_t ll_unstable_stats_seq_write(struct file *file,
1105                                            const char __user *buffer,
1106                                            size_t count, loff_t *unused)
1107 {
1108         struct seq_file *seq = file->private_data;
1109         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)seq->private);
1110         char kernbuf[128];
1111         bool val;
1112         int rc;
1113
1114         if (count == 0)
1115                 return 0;
1116         if (count >= sizeof(kernbuf))
1117                 return -EINVAL;
1118
1119         if (copy_from_user(kernbuf, buffer, count))
1120                 return -EFAULT;
1121         kernbuf[count] = 0;
1122
1123         buffer += lprocfs_find_named_value(kernbuf, "unstable_check:", &count) -
1124                   kernbuf;
1125         rc = kstrtobool_from_user(buffer, count, &val);
1126         if (rc < 0)
1127                 return rc;
1128
1129         /* borrow lru lock to set the value */
1130         spin_lock(&sbi->ll_cache->ccc_lru_lock);
1131         sbi->ll_cache->ccc_unstable_check = val;
1132         spin_unlock(&sbi->ll_cache->ccc_lru_lock);
1133
1134         return count;
1135 }
1136
1137 LDEBUGFS_SEQ_FOPS(ll_unstable_stats);
1138
1139 static int ll_root_squash_seq_show(struct seq_file *m, void *v)
1140 {
1141         struct super_block *sb = m->private;
1142         struct ll_sb_info *sbi = ll_s2sbi(sb);
1143         struct root_squash_info *squash = &sbi->ll_squash;
1144
1145         seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
1146         return 0;
1147 }
1148
1149 static ssize_t ll_root_squash_seq_write(struct file *file,
1150                                         const char __user *buffer,
1151                                         size_t count, loff_t *off)
1152 {
1153         struct seq_file *m = file->private_data;
1154         struct super_block *sb = m->private;
1155         struct ll_sb_info *sbi = ll_s2sbi(sb);
1156         struct root_squash_info *squash = &sbi->ll_squash;
1157
1158         return lprocfs_wr_root_squash(buffer, count, squash,
1159                                       ll_get_fsname(sb, NULL, 0));
1160 }
1161
1162 LDEBUGFS_SEQ_FOPS(ll_root_squash);
1163
1164 static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
1165 {
1166         struct super_block *sb = m->private;
1167         struct ll_sb_info *sbi = ll_s2sbi(sb);
1168         struct root_squash_info *squash = &sbi->ll_squash;
1169         int len;
1170
1171         down_read(&squash->rsi_sem);
1172         if (!list_empty(&squash->rsi_nosquash_nids)) {
1173                 len = cfs_print_nidlist(m->buf + m->count, m->size - m->count,
1174                                         &squash->rsi_nosquash_nids);
1175                 m->count += len;
1176                 seq_putc(m, '\n');
1177         } else {
1178                 seq_puts(m, "NONE\n");
1179         }
1180         up_read(&squash->rsi_sem);
1181
1182         return 0;
1183 }
1184
1185 static ssize_t ll_nosquash_nids_seq_write(struct file *file,
1186                                           const char __user *buffer,
1187                                           size_t count, loff_t *off)
1188 {
1189         struct seq_file *m = file->private_data;
1190         struct super_block *sb = m->private;
1191         struct ll_sb_info *sbi = ll_s2sbi(sb);
1192         struct root_squash_info *squash = &sbi->ll_squash;
1193         int rc;
1194
1195         rc = lprocfs_wr_nosquash_nids(buffer, count, squash,
1196                                       ll_get_fsname(sb, NULL, 0));
1197         if (rc < 0)
1198                 return rc;
1199
1200         ll_compute_rootsquash_state(sbi);
1201
1202         return rc;
1203 }
1204
1205 LDEBUGFS_SEQ_FOPS(ll_nosquash_nids);
1206
1207 struct lprocfs_vars lprocfs_llite_obd_vars[] = {
1208         { .name =       "site",
1209           .fops =       &ll_site_stats_fops                     },
1210         { .name =       "max_read_ahead_mb",
1211           .fops =       &ll_max_readahead_mb_fops               },
1212         { .name =       "max_read_ahead_per_file_mb",
1213           .fops =       &ll_max_readahead_per_file_mb_fops      },
1214         { .name =       "max_read_ahead_whole_mb",
1215           .fops =       &ll_max_read_ahead_whole_mb_fops        },
1216         { .name =       "max_cached_mb",
1217           .fops =       &ll_max_cached_mb_fops                  },
1218         { .name =       "statahead_stats",
1219           .fops =       &ll_statahead_stats_fops                },
1220         { .name =       "unstable_stats",
1221           .fops =       &ll_unstable_stats_fops                 },
1222         { .name =       "sbi_flags",
1223           .fops =       &ll_sbi_flags_fops                      },
1224         { .name =       "root_squash",
1225           .fops =       &ll_root_squash_fops                    },
1226         { .name =       "nosquash_nids",
1227           .fops =       &ll_nosquash_nids_fops                  },
1228         { NULL }
1229 };
1230
1231 #define MAX_STRING_SIZE 128
1232
1233 static struct attribute *llite_attrs[] = {
1234         &lustre_attr_blocksize.attr,
1235         &lustre_attr_stat_blocksize.attr,
1236         &lustre_attr_kbytestotal.attr,
1237         &lustre_attr_kbytesfree.attr,
1238         &lustre_attr_kbytesavail.attr,
1239         &lustre_attr_filestotal.attr,
1240         &lustre_attr_filesfree.attr,
1241         &lustre_attr_client_type.attr,
1242         &lustre_attr_fstype.attr,
1243         &lustre_attr_uuid.attr,
1244         &lustre_attr_checksums.attr,
1245         &lustre_attr_checksum_pages.attr,
1246         &lustre_attr_stats_track_pid.attr,
1247         &lustre_attr_stats_track_ppid.attr,
1248         &lustre_attr_stats_track_gid.attr,
1249         &lustre_attr_statahead_running_max.attr,
1250         &lustre_attr_statahead_max.attr,
1251         &lustre_attr_statahead_agl.attr,
1252         &lustre_attr_lazystatfs.attr,
1253         &lustre_attr_max_easize.attr,
1254         &lustre_attr_default_easize.attr,
1255         &lustre_attr_xattr_cache.attr,
1256         &lustre_attr_fast_read.attr,
1257         &lustre_attr_tiny_write.attr,
1258         NULL,
1259 };
1260
1261 static void llite_kobj_release(struct kobject *kobj)
1262 {
1263         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1264                                               ll_kset.kobj);
1265         complete(&sbi->ll_kobj_unregister);
1266 }
1267
1268 static struct kobj_type llite_ktype = {
1269         .default_attrs  = llite_attrs,
1270         .sysfs_ops      = &lustre_sysfs_ops,
1271         .release        = llite_kobj_release,
1272 };
1273
1274 static const struct llite_file_opcode {
1275         __u32       opcode;
1276         __u32       type;
1277         const char *opname;
1278 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
1279         /* file operation */
1280         { LPROC_LL_DIRTY_HITS,     LPROCFS_TYPE_REGS, "dirty_pages_hits" },
1281         { LPROC_LL_DIRTY_MISSES,   LPROCFS_TYPE_REGS, "dirty_pages_misses" },
1282         { LPROC_LL_READ_BYTES,     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1283                                    "read_bytes" },
1284         { LPROC_LL_WRITE_BYTES,    LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1285                                    "write_bytes" },
1286         { LPROC_LL_BRW_READ,       LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1287                                    "brw_read" },
1288         { LPROC_LL_BRW_WRITE,      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1289                                    "brw_write" },
1290         { LPROC_LL_IOCTL,          LPROCFS_TYPE_REGS, "ioctl" },
1291         { LPROC_LL_OPEN,           LPROCFS_TYPE_REGS, "open" },
1292         { LPROC_LL_RELEASE,        LPROCFS_TYPE_REGS, "close" },
1293         { LPROC_LL_MAP,            LPROCFS_TYPE_REGS, "mmap" },
1294         { LPROC_LL_FAULT,          LPROCFS_TYPE_REGS, "page_fault" },
1295         { LPROC_LL_MKWRITE,        LPROCFS_TYPE_REGS, "page_mkwrite" },
1296         { LPROC_LL_LLSEEK,         LPROCFS_TYPE_REGS, "seek" },
1297         { LPROC_LL_FSYNC,          LPROCFS_TYPE_REGS, "fsync" },
1298         { LPROC_LL_READDIR,        LPROCFS_TYPE_REGS, "readdir" },
1299         /* inode operation */
1300         { LPROC_LL_SETATTR,        LPROCFS_TYPE_REGS, "setattr" },
1301         { LPROC_LL_TRUNC,          LPROCFS_TYPE_REGS, "truncate" },
1302         { LPROC_LL_FLOCK,          LPROCFS_TYPE_REGS, "flock" },
1303         { LPROC_LL_GETATTR,        LPROCFS_TYPE_REGS, "getattr" },
1304         /* dir inode operation */
1305         { LPROC_LL_CREATE,         LPROCFS_TYPE_REGS, "create" },
1306         { LPROC_LL_LINK,           LPROCFS_TYPE_REGS, "link" },
1307         { LPROC_LL_UNLINK,         LPROCFS_TYPE_REGS, "unlink" },
1308         { LPROC_LL_SYMLINK,        LPROCFS_TYPE_REGS, "symlink" },
1309         { LPROC_LL_MKDIR,          LPROCFS_TYPE_REGS, "mkdir" },
1310         { LPROC_LL_RMDIR,          LPROCFS_TYPE_REGS, "rmdir" },
1311         { LPROC_LL_MKNOD,          LPROCFS_TYPE_REGS, "mknod" },
1312         { LPROC_LL_RENAME,         LPROCFS_TYPE_REGS, "rename" },
1313         /* special inode operation */
1314         { LPROC_LL_STAFS,          LPROCFS_TYPE_REGS, "statfs" },
1315         { LPROC_LL_ALLOC_INODE,    LPROCFS_TYPE_REGS, "alloc_inode" },
1316         { LPROC_LL_SETXATTR,       LPROCFS_TYPE_REGS, "setxattr" },
1317         { LPROC_LL_GETXATTR,       LPROCFS_TYPE_REGS, "getxattr" },
1318         { LPROC_LL_GETXATTR_HITS,  LPROCFS_TYPE_REGS, "getxattr_hits" },
1319         { LPROC_LL_LISTXATTR,      LPROCFS_TYPE_REGS, "listxattr" },
1320         { LPROC_LL_REMOVEXATTR,    LPROCFS_TYPE_REGS, "removexattr" },
1321         { LPROC_LL_INODE_PERM,     LPROCFS_TYPE_REGS, "inode_permission" },
1322 };
1323
1324 void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
1325 {
1326         if (!sbi->ll_stats)
1327                 return;
1328         if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
1329                 lprocfs_counter_add(sbi->ll_stats, op, count);
1330         else if (sbi->ll_stats_track_type == STATS_TRACK_PID &&
1331                  sbi->ll_stats_track_id == current->pid)
1332                 lprocfs_counter_add(sbi->ll_stats, op, count);
1333         else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
1334                  sbi->ll_stats_track_id == current->parent->pid)
1335                 lprocfs_counter_add(sbi->ll_stats, op, count);
1336         else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
1337                  sbi->ll_stats_track_id ==
1338                         from_kgid(&init_user_ns, current_gid()))
1339                 lprocfs_counter_add(sbi->ll_stats, op, count);
1340 }
1341 EXPORT_SYMBOL(ll_stats_ops_tally);
1342
1343 static const char *ra_stat_string[] = {
1344         [RA_STAT_HIT] = "hits",
1345         [RA_STAT_MISS] = "misses",
1346         [RA_STAT_DISTANT_READPAGE] = "readpage not consecutive",
1347         [RA_STAT_MISS_IN_WINDOW] = "miss inside window",
1348         [RA_STAT_FAILED_GRAB_PAGE] = "failed grab_cache_page",
1349         [RA_STAT_FAILED_MATCH] = "failed lock match",
1350         [RA_STAT_DISCARDED] = "read but discarded",
1351         [RA_STAT_ZERO_LEN] = "zero length file",
1352         [RA_STAT_ZERO_WINDOW] = "zero size window",
1353         [RA_STAT_EOF] = "read-ahead to EOF",
1354         [RA_STAT_MAX_IN_FLIGHT] = "hit max r-a issue",
1355         [RA_STAT_WRONG_GRAB_PAGE] = "wrong page from grab_cache_page",
1356         [RA_STAT_FAILED_REACH_END] = "failed to reach end"
1357 };
1358
1359 int ll_debugfs_register_super(struct super_block *sb, const char *name)
1360 {
1361         struct lustre_sb_info *lsi = s2lsi(sb);
1362         struct ll_sb_info *sbi = ll_s2sbi(sb);
1363         int err, id, rc;
1364
1365         ENTRY;
1366         LASSERT(sbi);
1367
1368         if (IS_ERR_OR_NULL(llite_root))
1369                 goto out_ll_kset;
1370
1371         sbi->ll_debugfs_entry = ldebugfs_register(name, llite_root,
1372                                                   lprocfs_llite_obd_vars, sb);
1373         if (IS_ERR_OR_NULL(sbi->ll_debugfs_entry)) {
1374                 err = sbi->ll_debugfs_entry ? PTR_ERR(sbi->ll_debugfs_entry) :
1375                                               -ENOMEM;
1376                 sbi->ll_debugfs_entry = NULL;
1377                 RETURN(err);
1378         }
1379
1380         rc = ldebugfs_seq_create(sbi->ll_debugfs_entry, "dump_page_cache",0444,
1381                                  &vvp_dump_pgcache_file_ops, sbi);
1382         if (rc)
1383                 CWARN("Error adding the dump_page_cache file\n");
1384
1385         rc = ldebugfs_seq_create(sbi->ll_debugfs_entry, "extents_stats", 0644,
1386                                  &ll_rw_extents_stats_fops, sbi);
1387         if (rc)
1388                 CWARN("Error adding the extent_stats file\n");
1389
1390         rc = ldebugfs_seq_create(sbi->ll_debugfs_entry,
1391                                  "extents_stats_per_process", 0644,
1392                                  &ll_rw_extents_stats_pp_fops, sbi);
1393         if (rc)
1394                 CWARN("Error adding the extents_stats_per_process file\n");
1395
1396         rc = ldebugfs_seq_create(sbi->ll_debugfs_entry, "offset_stats", 0644,
1397                                  &ll_rw_offset_stats_fops, sbi);
1398         if (rc)
1399                 CWARN("Error adding the offset_stats file\n");
1400
1401         /* File operations stats */
1402         sbi->ll_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES,
1403                                             LPROCFS_STATS_FLAG_NONE);
1404         if (sbi->ll_stats == NULL)
1405                 GOTO(out_debugfs, err = -ENOMEM);
1406
1407         /* do counter init */
1408         for (id = 0; id < LPROC_LL_FILE_OPCODES; id++) {
1409                 u32 type = llite_opcode_table[id].type;
1410                 void *ptr = NULL;
1411
1412                 if (type & LPROCFS_TYPE_REGS)
1413                         ptr = "regs";
1414                 else if (type & LPROCFS_TYPE_BYTES)
1415                         ptr = "bytes";
1416                 else if (type & LPROCFS_TYPE_PAGES)
1417                         ptr = "pages";
1418                 lprocfs_counter_init(sbi->ll_stats,
1419                                      llite_opcode_table[id].opcode,
1420                                      (type & LPROCFS_CNTR_AVGMINMAX),
1421                                      llite_opcode_table[id].opname, ptr);
1422         }
1423
1424         err = ldebugfs_register_stats(sbi->ll_debugfs_entry, "stats",
1425                                       sbi->ll_stats);
1426         if (err)
1427                 GOTO(out_stats, err);
1428
1429         sbi->ll_ra_stats = lprocfs_alloc_stats(ARRAY_SIZE(ra_stat_string),
1430                                                LPROCFS_STATS_FLAG_NONE);
1431         if (sbi->ll_ra_stats == NULL)
1432                 GOTO(out_stats, err = -ENOMEM);
1433
1434         for (id = 0; id < ARRAY_SIZE(ra_stat_string); id++)
1435                 lprocfs_counter_init(sbi->ll_ra_stats, id, 0,
1436                                      ra_stat_string[id], "pages");
1437
1438         err = ldebugfs_register_stats(sbi->ll_debugfs_entry, "read_ahead_stats",
1439                                       sbi->ll_ra_stats);
1440         if (err)
1441                 GOTO(out_ra_stats, err);
1442
1443 out_ll_kset:
1444         /* Yes we also register sysfs mount kset here as well */
1445         sbi->ll_kset.kobj.parent = llite_kobj;
1446         sbi->ll_kset.kobj.ktype = &llite_ktype;
1447         init_completion(&sbi->ll_kobj_unregister);
1448         err = kobject_set_name(&sbi->ll_kset.kobj, "%s", name);
1449         if (err)
1450                 GOTO(out_ra_stats, err);
1451
1452         err = kset_register(&sbi->ll_kset);
1453         if (err)
1454                 GOTO(out_ra_stats, err);
1455
1456         lsi->lsi_kobj = kobject_get(&sbi->ll_kset.kobj);
1457
1458         RETURN(0);
1459 out_ra_stats:
1460         lprocfs_free_stats(&sbi->ll_ra_stats);
1461 out_stats:
1462         lprocfs_free_stats(&sbi->ll_stats);
1463 out_debugfs:
1464         ldebugfs_remove(&sbi->ll_debugfs_entry);
1465
1466         RETURN(err);
1467 }
1468
1469 void ll_debugfs_unregister_super(struct super_block *sb)
1470 {
1471         struct lustre_sb_info *lsi = s2lsi(sb);
1472         struct ll_sb_info *sbi = ll_s2sbi(sb);
1473
1474         if (!IS_ERR_OR_NULL(sbi->ll_debugfs_entry))
1475                 ldebugfs_remove(&sbi->ll_debugfs_entry);
1476
1477         if (sbi->ll_dt_obd)
1478                 sysfs_remove_link(&sbi->ll_kset.kobj,
1479                                   sbi->ll_dt_obd->obd_type->typ_name);
1480
1481         if (sbi->ll_md_obd)
1482                 sysfs_remove_link(&sbi->ll_kset.kobj,
1483                                   sbi->ll_md_obd->obd_type->typ_name);
1484
1485         kobject_put(lsi->lsi_kobj);
1486
1487         kset_unregister(&sbi->ll_kset);
1488         wait_for_completion(&sbi->ll_kobj_unregister);
1489
1490         lprocfs_free_stats(&sbi->ll_ra_stats);
1491         lprocfs_free_stats(&sbi->ll_stats);
1492 }
1493 #undef MAX_STRING_SIZE
1494
1495 static void ll_display_extents_info(struct ll_rw_extents_info *io_extents,
1496                                    struct seq_file *seq, int which)
1497 {
1498         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
1499         unsigned long start, end, r, w;
1500         char *unitp = "KMGTPEZY";
1501         int i, units = 10;
1502         struct per_process_info *pp_info = &io_extents->pp_extents[which];
1503
1504         read_cum = 0;
1505         write_cum = 0;
1506         start = 0;
1507
1508         for(i = 0; i < LL_HIST_MAX; i++) {
1509                 read_tot += pp_info->pp_r_hist.oh_buckets[i];
1510                 write_tot += pp_info->pp_w_hist.oh_buckets[i];
1511         }
1512
1513         for(i = 0; i < LL_HIST_MAX; i++) {
1514                 r = pp_info->pp_r_hist.oh_buckets[i];
1515                 w = pp_info->pp_w_hist.oh_buckets[i];
1516                 read_cum += r;
1517                 write_cum += w;
1518                 end = BIT(i + LL_HIST_START - units);
1519                 seq_printf(seq, "%4lu%c - %4lu%c%c: %14lu %4u %4u  | "
1520                            "%14lu %4u %4u\n", start, *unitp, end, *unitp,
1521                            (i == LL_HIST_MAX - 1) ? '+' : ' ',
1522                            r, pct(r, read_tot), pct(read_cum, read_tot),
1523                            w, pct(w, write_tot), pct(write_cum, write_tot));
1524                 start = end;
1525                 if (start == BIT(10)) {
1526                         start = 1;
1527                         units += 10;
1528                         unitp++;
1529                 }
1530                 if (read_cum == read_tot && write_cum == write_tot)
1531                         break;
1532         }
1533 }
1534
1535 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
1536 {
1537         struct timespec64 now;
1538         struct ll_sb_info *sbi = seq->private;
1539         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1540         int k;
1541
1542         ktime_get_real_ts64(&now);
1543
1544         if (!sbi->ll_rw_stats_on) {
1545                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1546                 return 0;
1547         }
1548         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1549                    (s64)now.tv_sec, now.tv_nsec);
1550         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1551         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1552                    "extents", "calls", "%", "cum%",
1553                    "calls", "%", "cum%");
1554         spin_lock(&sbi->ll_pp_extent_lock);
1555         for (k = 0; k < LL_PROCESS_HIST_MAX; k++) {
1556                 if (io_extents->pp_extents[k].pid != 0) {
1557                         seq_printf(seq, "\nPID: %d\n",
1558                                    io_extents->pp_extents[k].pid);
1559                         ll_display_extents_info(io_extents, seq, k);
1560                 }
1561         }
1562         spin_unlock(&sbi->ll_pp_extent_lock);
1563         return 0;
1564 }
1565
1566 static ssize_t ll_rw_extents_stats_pp_seq_write(struct file *file,
1567                                                 const char __user *buf,
1568                                                 size_t len,
1569                                                 loff_t *off)
1570 {
1571         struct seq_file *seq = file->private_data;
1572         struct ll_sb_info *sbi = seq->private;
1573         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1574         int i;
1575         __s64 value;
1576
1577         if (len == 0)
1578                 return -EINVAL;
1579
1580         value = ll_stats_pid_write(buf, len);
1581
1582         if (value == 0)
1583                 sbi->ll_rw_stats_on = 0;
1584         else
1585                 sbi->ll_rw_stats_on = 1;
1586
1587         spin_lock(&sbi->ll_pp_extent_lock);
1588         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1589                 io_extents->pp_extents[i].pid = 0;
1590                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1591                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1592         }
1593         spin_unlock(&sbi->ll_pp_extent_lock);
1594         return len;
1595 }
1596
1597 LDEBUGFS_SEQ_FOPS(ll_rw_extents_stats_pp);
1598
1599 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
1600 {
1601         struct timespec64 now;
1602         struct ll_sb_info *sbi = seq->private;
1603         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1604
1605         ktime_get_real_ts64(&now);
1606
1607         if (!sbi->ll_rw_stats_on) {
1608                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1609                 return 0;
1610         }
1611         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1612                    (s64)now.tv_sec, now.tv_nsec);
1613
1614         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1615         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1616                    "extents", "calls", "%", "cum%",
1617                    "calls", "%", "cum%");
1618         spin_lock(&sbi->ll_lock);
1619         ll_display_extents_info(io_extents, seq, LL_PROCESS_HIST_MAX);
1620         spin_unlock(&sbi->ll_lock);
1621
1622         return 0;
1623 }
1624
1625 static ssize_t ll_rw_extents_stats_seq_write(struct file *file,
1626                                              const char __user *buf,
1627                                              size_t len, loff_t *off)
1628 {
1629         struct seq_file *seq = file->private_data;
1630         struct ll_sb_info *sbi = seq->private;
1631         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1632         int i;
1633         __s64 value;
1634
1635         if (len == 0)
1636                 return -EINVAL;
1637
1638         value = ll_stats_pid_write(buf, len);
1639
1640         if (value == 0)
1641                 sbi->ll_rw_stats_on = 0;
1642         else
1643                 sbi->ll_rw_stats_on = 1;
1644
1645         spin_lock(&sbi->ll_pp_extent_lock);
1646         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
1647                 io_extents->pp_extents[i].pid = 0;
1648                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1649                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1650         }
1651         spin_unlock(&sbi->ll_pp_extent_lock);
1652
1653         return len;
1654 }
1655
1656 LDEBUGFS_SEQ_FOPS(ll_rw_extents_stats);
1657
1658 void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
1659                        struct ll_file_data *file, loff_t pos,
1660                        size_t count, int rw)
1661 {
1662         int i, cur = -1;
1663         struct ll_rw_process_info *process;
1664         struct ll_rw_process_info *offset;
1665         int *off_count = &sbi->ll_rw_offset_entry_count;
1666         int *process_count = &sbi->ll_offset_process_count;
1667         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1668
1669         if(!sbi->ll_rw_stats_on)
1670                 return;
1671         process = sbi->ll_rw_process_info;
1672         offset = sbi->ll_rw_offset_info;
1673
1674         spin_lock(&sbi->ll_pp_extent_lock);
1675         /* Extent statistics */
1676         for(i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1677                 if(io_extents->pp_extents[i].pid == pid) {
1678                         cur = i;
1679                         break;
1680                 }
1681         }
1682
1683         if (cur == -1) {
1684                 /* new process */
1685                 sbi->ll_extent_process_count =
1686                         (sbi->ll_extent_process_count + 1) % LL_PROCESS_HIST_MAX;
1687                 cur = sbi->ll_extent_process_count;
1688                 io_extents->pp_extents[cur].pid = pid;
1689                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_r_hist);
1690                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_w_hist);
1691         }
1692
1693         for(i = 0; (count >= BIT(LL_HIST_START << i)) &&
1694              (i < (LL_HIST_MAX - 1)); i++);
1695         if (rw == 0) {
1696                 io_extents->pp_extents[cur].pp_r_hist.oh_buckets[i]++;
1697                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_r_hist.oh_buckets[i]++;
1698         } else {
1699                 io_extents->pp_extents[cur].pp_w_hist.oh_buckets[i]++;
1700                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_w_hist.oh_buckets[i]++;
1701         }
1702         spin_unlock(&sbi->ll_pp_extent_lock);
1703
1704         spin_lock(&sbi->ll_process_lock);
1705         /* Offset statistics */
1706         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1707                 if (process[i].rw_pid == pid) {
1708                         if (process[i].rw_last_file != file) {
1709                                 process[i].rw_range_start = pos;
1710                                 process[i].rw_last_file_pos = pos + count;
1711                                 process[i].rw_smallest_extent = count;
1712                                 process[i].rw_largest_extent = count;
1713                                 process[i].rw_offset = 0;
1714                                 process[i].rw_last_file = file;
1715                                 spin_unlock(&sbi->ll_process_lock);
1716                                 return;
1717                         }
1718                         if (process[i].rw_last_file_pos != pos) {
1719                                 *off_count =
1720                                     (*off_count + 1) % LL_OFFSET_HIST_MAX;
1721                                 offset[*off_count].rw_op = process[i].rw_op;
1722                                 offset[*off_count].rw_pid = pid;
1723                                 offset[*off_count].rw_range_start =
1724                                         process[i].rw_range_start;
1725                                 offset[*off_count].rw_range_end =
1726                                         process[i].rw_last_file_pos;
1727                                 offset[*off_count].rw_smallest_extent =
1728                                         process[i].rw_smallest_extent;
1729                                 offset[*off_count].rw_largest_extent =
1730                                         process[i].rw_largest_extent;
1731                                 offset[*off_count].rw_offset =
1732                                         process[i].rw_offset;
1733                                 process[i].rw_op = rw;
1734                                 process[i].rw_range_start = pos;
1735                                 process[i].rw_smallest_extent = count;
1736                                 process[i].rw_largest_extent = count;
1737                                 process[i].rw_offset = pos -
1738                                         process[i].rw_last_file_pos;
1739                         }
1740                         if(process[i].rw_smallest_extent > count)
1741                                 process[i].rw_smallest_extent = count;
1742                         if(process[i].rw_largest_extent < count)
1743                                 process[i].rw_largest_extent = count;
1744                         process[i].rw_last_file_pos = pos + count;
1745                         spin_unlock(&sbi->ll_process_lock);
1746                         return;
1747                 }
1748         }
1749         *process_count = (*process_count + 1) % LL_PROCESS_HIST_MAX;
1750         process[*process_count].rw_pid = pid;
1751         process[*process_count].rw_op = rw;
1752         process[*process_count].rw_range_start = pos;
1753         process[*process_count].rw_last_file_pos = pos + count;
1754         process[*process_count].rw_smallest_extent = count;
1755         process[*process_count].rw_largest_extent = count;
1756         process[*process_count].rw_offset = 0;
1757         process[*process_count].rw_last_file = file;
1758         spin_unlock(&sbi->ll_process_lock);
1759 }
1760
1761 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
1762 {
1763         struct timespec64 now;
1764         struct ll_sb_info *sbi = seq->private;
1765         struct ll_rw_process_info *offset = sbi->ll_rw_offset_info;
1766         struct ll_rw_process_info *process = sbi->ll_rw_process_info;
1767         int i;
1768
1769         ktime_get_real_ts64(&now);
1770
1771         if (!sbi->ll_rw_stats_on) {
1772                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1773                 return 0;
1774         }
1775         spin_lock(&sbi->ll_process_lock);
1776
1777         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1778                    (s64)now.tv_sec, now.tv_nsec);
1779         seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
1780                    "R/W", "PID", "RANGE START", "RANGE END",
1781                    "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");
1782
1783         /* We stored the discontiguous offsets here; print them first */
1784         for (i = 0; i < LL_OFFSET_HIST_MAX; i++) {
1785                 if (offset[i].rw_pid != 0)
1786                         seq_printf(seq,
1787                                   "%3c %10d %14llu %14llu %17lu %17lu %14llu\n",
1788                                    offset[i].rw_op == READ ? 'R' : 'W',
1789                                    offset[i].rw_pid,
1790                                    offset[i].rw_range_start,
1791                                    offset[i].rw_range_end,
1792                                    (unsigned long)offset[i].rw_smallest_extent,
1793                                    (unsigned long)offset[i].rw_largest_extent,
1794                                    offset[i].rw_offset);
1795         }
1796
1797         /* Then print the current offsets for each process */
1798         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1799                 if (process[i].rw_pid != 0)
1800                         seq_printf(seq,
1801                                   "%3c %10d %14llu %14llu %17lu %17lu %14llu\n",
1802                                    process[i].rw_op == READ ? 'R' : 'W',
1803                                    process[i].rw_pid,
1804                                    process[i].rw_range_start,
1805                                    process[i].rw_last_file_pos,
1806                                    (unsigned long)process[i].rw_smallest_extent,
1807                                    (unsigned long)process[i].rw_largest_extent,
1808                                    process[i].rw_offset);
1809         }
1810         spin_unlock(&sbi->ll_process_lock);
1811
1812         return 0;
1813 }
1814
1815 static ssize_t ll_rw_offset_stats_seq_write(struct file *file,
1816                                             const char __user *buf,
1817                                             size_t len, loff_t *off)
1818 {
1819         struct seq_file *seq = file->private_data;
1820         struct ll_sb_info *sbi = seq->private;
1821         struct ll_rw_process_info *process_info = sbi->ll_rw_process_info;
1822         struct ll_rw_process_info *offset_info = sbi->ll_rw_offset_info;
1823         __s64 value;
1824
1825         if (len == 0)
1826                 return -EINVAL;
1827
1828         value = ll_stats_pid_write(buf, len);
1829
1830         if (value == 0)
1831                 sbi->ll_rw_stats_on = 0;
1832         else
1833                 sbi->ll_rw_stats_on = 1;
1834
1835         spin_lock(&sbi->ll_process_lock);
1836         sbi->ll_offset_process_count = 0;
1837         sbi->ll_rw_offset_entry_count = 0;
1838         memset(process_info, 0, sizeof(struct ll_rw_process_info) *
1839                LL_PROCESS_HIST_MAX);
1840         memset(offset_info, 0, sizeof(struct ll_rw_process_info) *
1841                LL_OFFSET_HIST_MAX);
1842         spin_unlock(&sbi->ll_process_lock);
1843
1844         return len;
1845 }
1846
1847 LDEBUGFS_SEQ_FOPS(ll_rw_offset_stats);