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 struct proc_dir_entry *proc_lustre_fs_root;
  47 static struct kobject *llite_kobj;
  48
  49 int llite_tunables_register(void)
  50 {
  51         int rc = 0;
  52
  53         proc_lustre_fs_root = lprocfs_register("llite", proc_lustre_root,
  54                                                NULL, NULL);
  55         if (IS_ERR(proc_lustre_fs_root)) {
  56                 rc = PTR_ERR(proc_lustre_fs_root);
  57                 CERROR("cannot register '/proc/fs/lustre/llite': rc = %d\n",
  58                        rc);
  59                 proc_lustre_fs_root = NULL;
  60                 return rc;
  61         }
  62
  63         llite_kobj = class_setup_tunables("llite");
  64         if (IS_ERR(llite_kobj)) {
  65                 rc = PTR_ERR(llite_kobj);
  66                 llite_kobj = NULL;
  67         }
  68
  69         return rc;
  70 }
  71
  72 void llite_tunables_unregister(void)
  73 {
  74         if (llite_kobj)
  75                 kobject_put(llite_kobj);
  76
  77         lprocfs_remove(&proc_lustre_fs_root);
  78 }
  79
  80 #ifdef CONFIG_PROC_FS
  81 /* /proc/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 static __s64 ll_stats_pid_write(const char __user *buf, size_t len);
  86
  87 static ssize_t blocksize_show(struct kobject *kobj, struct attribute *attr,
  88                               char *buf)
  89 {
  90         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
  91                                               ll_kset.kobj);
  92         struct obd_statfs osfs;
  93         int rc;
  94
  95         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
  96         if (rc)
  97                 return rc;
  98
  99         return sprintf(buf, "%u\n", osfs.os_bsize);
 100 }
 101 LUSTRE_RO_ATTR(blocksize);
 102
 103 static int ll_stat_blksize_seq_show(struct seq_file *m, void *v)
 104 {
 105         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 106
 107         seq_printf(m, "%u\n", sbi->ll_stat_blksize);
 108
 109         return 0;
 110 }
 111
 112 static ssize_t ll_stat_blksize_seq_write(struct file *file,
 113                                          const char __user *buffer,
 114                                          size_t count, loff_t *off)
 115 {
 116         struct seq_file *m = file->private_data;
 117         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 118         unsigned int val;
 119         int rc;
 120
 121         rc = kstrtouint_from_user(buffer, count, 0, &val);
 122         if (rc)
 123                 return rc;
 124
 125         if (val != 0 && (val < PAGE_SIZE || (val & (val - 1))) != 0)
 126                 return -ERANGE;
 127
 128         sbi->ll_stat_blksize = val;
 129
 130         return count;
 131 }
 132 LPROC_SEQ_FOPS(ll_stat_blksize);
 133
 134 static ssize_t kbytestotal_show(struct kobject *kobj, struct attribute *attr,
 135                                 char *buf)
 136 {
 137         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 138                                               ll_kset.kobj);
 139         struct obd_statfs osfs;
 140         u32 blk_size;
 141         u64 result;
 142         int rc;
 143
 144         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 145         if (rc)
 146                 return rc;
 147
 148         blk_size = osfs.os_bsize >> 10;
 149         result = osfs.os_blocks;
 150
 151         while (blk_size >>= 1)
 152                 result <<= 1;
 153
 154         return sprintf(buf, "%llu\n", result);
 155 }
 156 LUSTRE_RO_ATTR(kbytestotal);
 157
 158 static ssize_t kbytesfree_show(struct kobject *kobj, struct attribute *attr,
 159                                char *buf)
 160 {
 161         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 162                                               ll_kset.kobj);
 163         struct obd_statfs osfs;
 164         u32 blk_size;
 165         u64 result;
 166         int rc;
 167
 168         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 169         if (rc)
 170                 return rc;
 171
 172         blk_size = osfs.os_bsize >> 10;
 173         result = osfs.os_bfree;
 174
 175         while (blk_size >>= 1)
 176                 result <<= 1;
 177
 178         return sprintf(buf, "%llu\n", result);
 179 }
 180 LUSTRE_RO_ATTR(kbytesfree);
 181
 182 static ssize_t kbytesavail_show(struct kobject *kobj, struct attribute *attr,
 183                                 char *buf)
 184 {
 185         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 186                                               ll_kset.kobj);
 187         struct obd_statfs osfs;
 188         u32 blk_size;
 189         u64 result;
 190         int rc;
 191
 192         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 193         if (rc)
 194                 return rc;
 195
 196         blk_size = osfs.os_bsize >> 10;
 197         result = osfs.os_bavail;
 198
 199         while (blk_size >>= 1)
 200                 result <<= 1;
 201
 202         return sprintf(buf, "%llu\n", result);
 203 }
 204 LUSTRE_RO_ATTR(kbytesavail);
 205
 206 static ssize_t filestotal_show(struct kobject *kobj, struct attribute *attr,
 207                                char *buf)
 208 {
 209         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 210                                               ll_kset.kobj);
 211         struct obd_statfs osfs;
 212         int rc;
 213
 214         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 215         if (rc)
 216                 return rc;
 217
 218         return sprintf(buf, "%llu\n", osfs.os_files);
 219 }
 220 LUSTRE_RO_ATTR(filestotal);
 221
 222 static ssize_t filesfree_show(struct kobject *kobj, struct attribute *attr,
 223                               char *buf)
 224 {
 225         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 226                                               ll_kset.kobj);
 227         struct obd_statfs osfs;
 228         int rc;
 229
 230         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 231         if (rc)
 232                 return rc;
 233
 234         return sprintf(buf, "%llu\n", osfs.os_ffree);
 235 }
 236 LUSTRE_RO_ATTR(filesfree);
 237
 238 static ssize_t client_type_show(struct kobject *kobj, struct attribute *attr,
 239                                 char *buf)
 240 {
 241         return sprintf(buf, "local client\n");
 242 }
 243 LUSTRE_RO_ATTR(client_type);
 244
 245 static ssize_t fstype_show(struct kobject *kobj, struct attribute *attr,
 246                            char *buf)
 247 {
 248         return sprintf(buf, "lustre\n");
 249 }
 250 LUSTRE_RO_ATTR(fstype);
 251
 252 static ssize_t uuid_show(struct kobject *kobj, struct attribute *attr,
 253                          char *buf)
 254 {
 255         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 256                                               ll_kset.kobj);
 257
 258         return sprintf(buf, "%s\n", sbi->ll_sb_uuid.uuid);
 259 }
 260 LUSTRE_RO_ATTR(uuid);
 261
 262 static int ll_xattr_cache_seq_show(struct seq_file *m, void *v)
 263 {
 264         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 265
 266         seq_printf(m, "%u\n", sbi->ll_xattr_cache_enabled);
 267         return 0;
 268 }
 269
 270 static ssize_t ll_xattr_cache_seq_write(struct file *file,
 271                                         const char __user *buffer,
 272                                         size_t count, loff_t *off)
 273 {
 274         struct seq_file *m = file->private_data;
 275         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 276         bool val;
 277         int rc;
 278
 279         rc = kstrtobool_from_user(buffer, count, &val);
 280         if (rc)
 281                 return rc;
 282
 283         if (val && !(sbi->ll_flags & LL_SBI_XATTR_CACHE))
 284                 return -ENOTSUPP;
 285
 286         sbi->ll_xattr_cache_enabled = val;
 287         sbi->ll_xattr_cache_set = 1;
 288
 289         return count;
 290 }
 291 LPROC_SEQ_FOPS(ll_xattr_cache);
 292
 293 static int ll_site_stats_seq_show(struct seq_file *m, void *v)
 294 {
 295         struct super_block *sb = m->private;
 296
 297         /*
 298          * See description of statistical counters in struct cl_site, and
 299          * struct lu_site.
 300          */
 301         return cl_site_stats_print(lu2cl_site(ll_s2sbi(sb)->ll_site), m);
 302 }
 303 LPROC_SEQ_FOPS_RO(ll_site_stats);
 304
 305 static int ll_max_readahead_mb_seq_show(struct seq_file *m, void *v)
 306 {
 307         struct super_block *sb = m->private;
 308         struct ll_sb_info *sbi = ll_s2sbi(sb);
 309         long pages_number;
 310         int mult;
 311
 312         spin_lock(&sbi->ll_lock);
 313         pages_number = sbi->ll_ra_info.ra_max_pages;
 314         spin_unlock(&sbi->ll_lock);
 315
 316         mult = 1 << (20 - PAGE_SHIFT);
 317         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 318 }
 319
 320 static ssize_t
 321 ll_max_readahead_mb_seq_write(struct file *file, const char __user *buffer,
 322                               size_t count, loff_t *off)
 323 {
 324         struct seq_file *m = file->private_data;
 325         struct super_block *sb = m->private;
 326         struct ll_sb_info *sbi = ll_s2sbi(sb);
 327         __s64 pages_number;
 328         int rc;
 329
 330         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 331         if (rc)
 332                 return rc;
 333
 334         pages_number >>= PAGE_SHIFT;
 335
 336         if (pages_number < 0 || pages_number > totalram_pages / 2) {
 337                 /* 1/2 of RAM */
 338                 CERROR("%s: can't set max_readahead_mb=%lu > %luMB\n",
 339                        ll_get_fsname(sb, NULL, 0),
 340                        (unsigned long)pages_number >> (20 - PAGE_SHIFT),
 341                        totalram_pages >> (20 - PAGE_SHIFT + 1));
 342                 return -ERANGE;
 343         }
 344
 345         spin_lock(&sbi->ll_lock);
 346         sbi->ll_ra_info.ra_max_pages = pages_number;
 347         spin_unlock(&sbi->ll_lock);
 348         return count;
 349 }
 350 LPROC_SEQ_FOPS(ll_max_readahead_mb);
 351
 352 static int ll_max_readahead_per_file_mb_seq_show(struct seq_file *m, void *v)
 353 {
 354         struct super_block *sb = m->private;
 355         struct ll_sb_info *sbi = ll_s2sbi(sb);
 356         long pages_number;
 357         int mult;
 358
 359         spin_lock(&sbi->ll_lock);
 360         pages_number = sbi->ll_ra_info.ra_max_pages_per_file;
 361         spin_unlock(&sbi->ll_lock);
 362
 363         mult = 1 << (20 - PAGE_SHIFT);
 364         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 365 }
 366
 367 static ssize_t
 368 ll_max_readahead_per_file_mb_seq_write(struct file *file,
 369                                        const char __user *buffer,
 370                                        size_t count, loff_t *off)
 371 {
 372         struct seq_file *m = file->private_data;
 373         struct super_block *sb = m->private;
 374         struct ll_sb_info *sbi = ll_s2sbi(sb);
 375         int rc;
 376         __s64 pages_number;
 377
 378         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 379         if (rc)
 380                 return rc;
 381
 382         pages_number >>= PAGE_SHIFT;
 383
 384         if (pages_number < 0 || pages_number > sbi->ll_ra_info.ra_max_pages) {
 385                 CERROR("%s: can't set max_readahead_per_file_mb=%lu > "
 386                        "max_read_ahead_mb=%lu\n", ll_get_fsname(sb, NULL, 0),
 387                        (unsigned long)pages_number >> (20 - PAGE_SHIFT),
 388                        sbi->ll_ra_info.ra_max_pages >> (20 - PAGE_SHIFT));
 389                 return -ERANGE;
 390         }
 391
 392         spin_lock(&sbi->ll_lock);
 393         sbi->ll_ra_info.ra_max_pages_per_file = pages_number;
 394         spin_unlock(&sbi->ll_lock);
 395         return count;
 396 }
 397 LPROC_SEQ_FOPS(ll_max_readahead_per_file_mb);
 398
 399 static int ll_max_read_ahead_whole_mb_seq_show(struct seq_file *m, void *v)
 400 {
 401         struct super_block *sb = m->private;
 402         struct ll_sb_info *sbi = ll_s2sbi(sb);
 403         long pages_number;
 404         int mult;
 405
 406         spin_lock(&sbi->ll_lock);
 407         pages_number = sbi->ll_ra_info.ra_max_read_ahead_whole_pages;
 408         spin_unlock(&sbi->ll_lock);
 409
 410         mult = 1 << (20 - PAGE_SHIFT);
 411         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 412 }
 413
 414 static ssize_t
 415 ll_max_read_ahead_whole_mb_seq_write(struct file *file,
 416                                      const char __user *buffer,
 417                                      size_t count, loff_t *off)
 418 {
 419         struct seq_file *m = file->private_data;
 420         struct super_block *sb = m->private;
 421         struct ll_sb_info *sbi = ll_s2sbi(sb);
 422         int rc;
 423         __s64 pages_number;
 424
 425         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 426         if (rc)
 427                 return rc;
 428
 429         pages_number >>= PAGE_SHIFT;
 430
 431         /* Cap this at the current max readahead window size, the readahead
 432          * algorithm does this anyway so it's pointless to set it larger. */
 433         if (pages_number < 0 ||
 434             pages_number > sbi->ll_ra_info.ra_max_pages_per_file) {
 435                 int pages_shift = 20 - PAGE_SHIFT;
 436                 CERROR("%s: can't set max_read_ahead_whole_mb=%lu > "
 437                        "max_read_ahead_per_file_mb=%lu\n",
 438                        ll_get_fsname(sb, NULL, 0),
 439                        (unsigned long)pages_number >> pages_shift,
 440                        sbi->ll_ra_info.ra_max_pages_per_file >> pages_shift);
 441                 return -ERANGE;
 442         }
 443
 444         spin_lock(&sbi->ll_lock);
 445         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = pages_number;
 446         spin_unlock(&sbi->ll_lock);
 447         return count;
 448 }
 449 LPROC_SEQ_FOPS(ll_max_read_ahead_whole_mb);
 450
 451 static int ll_max_cached_mb_seq_show(struct seq_file *m, void *v)
 452 {
 453         struct super_block     *sb    = m->private;
 454         struct ll_sb_info      *sbi   = ll_s2sbi(sb);
 455         struct cl_client_cache *cache = sbi->ll_cache;
 456         int shift = 20 - PAGE_SHIFT;
 457         long max_cached_mb;
 458         long unused_mb;
 459
 460         max_cached_mb = cache->ccc_lru_max >> shift;
 461         unused_mb = atomic_long_read(&cache->ccc_lru_left) >> shift;
 462         seq_printf(m, "users: %d\n"
 463                    "max_cached_mb: %ld\n"
 464                    "used_mb: %ld\n"
 465                    "unused_mb: %ld\n"
 466                    "reclaim_count: %u\n",
 467                    atomic_read(&cache->ccc_users),
 468                    max_cached_mb,
 469                    max_cached_mb - unused_mb,
 470                    unused_mb,
 471                    cache->ccc_lru_shrinkers);
 472         return 0;
 473 }
 474
 475 static ssize_t
 476 ll_max_cached_mb_seq_write(struct file *file, const char __user *buffer,
 477                            size_t count, loff_t *off)
 478 {
 479         struct seq_file *m = file->private_data;
 480         struct super_block *sb = m->private;
 481         struct ll_sb_info *sbi = ll_s2sbi(sb);
 482         struct cl_client_cache *cache = sbi->ll_cache;
 483         struct lu_env *env;
 484         long diff = 0;
 485         long nrpages = 0;
 486         __u16 refcheck;
 487         __s64 pages_number;
 488         long rc;
 489         char kernbuf[128];
 490         ENTRY;
 491
 492         if (count >= sizeof(kernbuf))
 493                 RETURN(-EINVAL);
 494
 495         if (copy_from_user(kernbuf, buffer, count))
 496                 RETURN(-EFAULT);
 497         kernbuf[count] = 0;
 498
 499         buffer += lprocfs_find_named_value(kernbuf, "max_cached_mb:", &count) -
 500                   kernbuf;
 501         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 502         if (rc)
 503                 RETURN(rc);
 504
 505         pages_number >>= PAGE_SHIFT;
 506
 507         if (pages_number < 0 || pages_number > totalram_pages) {
 508                 CERROR("%s: can't set max cache more than %lu MB\n",
 509                        ll_get_fsname(sb, NULL, 0),
 510                        totalram_pages >> (20 - PAGE_SHIFT));
 511                 RETURN(-ERANGE);
 512         }
 513         /* Allow enough cache so clients can make well-formed RPCs */
 514         pages_number = max_t(long, pages_number, PTLRPC_MAX_BRW_PAGES);
 515
 516         spin_lock(&sbi->ll_lock);
 517         diff = pages_number - cache->ccc_lru_max;
 518         spin_unlock(&sbi->ll_lock);
 519
 520         /* easy - add more LRU slots. */
 521         if (diff >= 0) {
 522                 atomic_long_add(diff, &cache->ccc_lru_left);
 523                 GOTO(out, rc = 0);
 524         }
 525
 526         env = cl_env_get(&refcheck);
 527         if (IS_ERR(env))
 528                 RETURN(rc);
 529
 530         diff = -diff;
 531         while (diff > 0) {
 532                 long tmp;
 533
 534                 /* reduce LRU budget from free slots. */
 535                 do {
 536                         long ov, nv;
 537
 538                         ov = atomic_long_read(&cache->ccc_lru_left);
 539                         if (ov == 0)
 540                                 break;
 541
 542                         nv = ov > diff ? ov - diff : 0;
 543                         rc = atomic_long_cmpxchg(&cache->ccc_lru_left, ov, nv);
 544                         if (likely(ov == rc)) {
 545                                 diff -= ov - nv;
 546                                 nrpages += ov - nv;
 547                                 break;
 548                         }
 549                 } while (1);
 550
 551                 if (diff <= 0)
 552                         break;
 553
 554                 if (sbi->ll_dt_exp == NULL) { /* being initialized */
 555                         rc = -ENODEV;
 556                         break;
 557                 }
 558
 559                 /* difficult - have to ask OSCs to drop LRU slots. */
 560                 tmp = diff << 1;
 561                 rc = obd_set_info_async(env, sbi->ll_dt_exp,
 562                                 sizeof(KEY_CACHE_LRU_SHRINK),
 563                                 KEY_CACHE_LRU_SHRINK,
 564                                 sizeof(tmp), &tmp, NULL);
 565                 if (rc < 0)
 566                         break;
 567         }
 568         cl_env_put(env, &refcheck);
 569
 570 out:
 571         if (rc >= 0) {
 572                 spin_lock(&sbi->ll_lock);
 573                 cache->ccc_lru_max = pages_number;
 574                 spin_unlock(&sbi->ll_lock);
 575                 rc = count;
 576         } else {
 577                 atomic_long_add(nrpages, &cache->ccc_lru_left);
 578         }
 579         return rc;
 580 }
 581 LPROC_SEQ_FOPS(ll_max_cached_mb);
 582
 583 static ssize_t checksum_pages_show(struct kobject *kobj, struct attribute *attr,
 584                                    char *buf)
 585 {
 586         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 587                                               ll_kset.kobj);
 588
 589         return sprintf(buf, "%u\n", (sbi->ll_flags & LL_SBI_CHECKSUM) ? 1 : 0);
 590 }
 591
 592 static ssize_t checksum_pages_store(struct kobject *kobj,
 593                                     struct attribute *attr,
 594                                     const char *buffer,
 595                                     size_t count)
 596 {
 597         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 598                                               ll_kset.kobj);
 599         bool val;
 600         int tmp;
 601         int rc;
 602
 603         if (!sbi->ll_dt_exp)
 604                 /* Not set up yet */
 605                 return -EAGAIN;
 606
 607         rc = kstrtobool(buffer, &val);
 608         if (rc)
 609                 return rc;
 610         if (val)
 611                 sbi->ll_flags |= LL_SBI_CHECKSUM;
 612         else
 613                 sbi->ll_flags &= ~LL_SBI_CHECKSUM;
 614         tmp = val;
 615
 616         rc = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 617                                 KEY_CHECKSUM, sizeof(tmp), &tmp, NULL);
 618         if (rc)
 619                 CWARN("Failed to set OSC checksum flags: %d\n", rc);
 620
 621         return count;
 622 }
 623 LUSTRE_RW_ATTR(checksum_pages);
 624
 625 static int ll_rd_track_id(struct seq_file *m, enum stats_track_type type)
 626 {
 627         struct super_block *sb = m->private;
 628
 629         if (ll_s2sbi(sb)->ll_stats_track_type == type) {
 630                 seq_printf(m, "%d\n",
 631                            ll_s2sbi(sb)->ll_stats_track_id);
 632         } else if (ll_s2sbi(sb)->ll_stats_track_type == STATS_TRACK_ALL) {
 633                 seq_puts(m, "0 (all)\n");
 634         } else {
 635                 seq_puts(m, "untracked\n");
 636         }
 637         return 0;
 638 }
 639
 640 static int ll_wr_track_id(const char __user *buffer, unsigned long count,
 641                           void *data, enum stats_track_type type)
 642 {
 643         struct super_block *sb = data;
 644         unsigned int pid;
 645         int rc;
 646
 647         rc = kstrtouint_from_user(buffer, count, 0, &pid);
 648         if (rc)
 649                 return rc;
 650
 651         ll_s2sbi(sb)->ll_stats_track_id = pid;
 652         if (pid == 0)
 653                 ll_s2sbi(sb)->ll_stats_track_type = STATS_TRACK_ALL;
 654         else
 655                 ll_s2sbi(sb)->ll_stats_track_type = type;
 656         lprocfs_clear_stats(ll_s2sbi(sb)->ll_stats);
 657         return count;
 658 }
 659
 660 static int ll_track_pid_seq_show(struct seq_file *m, void *v)
 661 {
 662         return ll_rd_track_id(m, STATS_TRACK_PID);
 663 }
 664
 665 static ssize_t ll_track_pid_seq_write(struct file *file,
 666                                       const char __user *buffer,
 667                                       size_t count, loff_t *off)
 668 {
 669         struct seq_file *seq = file->private_data;
 670         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PID);
 671 }
 672 LPROC_SEQ_FOPS(ll_track_pid);
 673
 674 static int ll_track_ppid_seq_show(struct seq_file *m, void *v)
 675 {
 676         return ll_rd_track_id(m, STATS_TRACK_PPID);
 677 }
 678
 679 static ssize_t ll_track_ppid_seq_write(struct file *file,
 680                                        const char __user *buffer,
 681                                        size_t count, loff_t *off)
 682 {
 683         struct seq_file *seq = file->private_data;
 684         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PPID);
 685 }
 686 LPROC_SEQ_FOPS(ll_track_ppid);
 687
 688 static int ll_track_gid_seq_show(struct seq_file *m, void *v)
 689 {
 690         return ll_rd_track_id(m, STATS_TRACK_GID);
 691 }
 692
 693 static ssize_t ll_track_gid_seq_write(struct file *file,
 694                                       const char __user *buffer,
 695                                       size_t count, loff_t *off)
 696 {
 697         struct seq_file *seq = file->private_data;
 698         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_GID);
 699 }
 700 LPROC_SEQ_FOPS(ll_track_gid);
 701
 702 static ssize_t statahead_running_max_show(struct kobject *kobj,
 703                                           struct attribute *attr,
 704                                           char *buf)
 705 {
 706         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 707                                               ll_kset.kobj);
 708
 709         return snprintf(buf, 16, "%u\n", sbi->ll_sa_running_max);
 710 }
 711
 712 static ssize_t statahead_running_max_store(struct kobject *kobj,
 713                                            struct attribute *attr,
 714                                            const char *buffer,
 715                                            size_t count)
 716 {
 717         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 718                                               ll_kset.kobj);
 719         unsigned long val;
 720         int rc;
 721
 722         rc = kstrtoul(buffer, 0, &val);
 723         if (rc)
 724                 return rc;
 725
 726         if (val <= LL_SA_RUNNING_MAX) {
 727                 sbi->ll_sa_running_max = val;
 728                 return count;
 729         }
 730
 731         CERROR("Bad statahead_running_max value %lu. Valid values "
 732                "are in the range [0, %d]\n", val, LL_SA_RUNNING_MAX);
 733
 734         return -ERANGE;
 735 }
 736 LUSTRE_RW_ATTR(statahead_running_max);
 737
 738 static int ll_statahead_max_seq_show(struct seq_file *m, void *v)
 739 {
 740         struct super_block *sb = m->private;
 741         struct ll_sb_info *sbi = ll_s2sbi(sb);
 742
 743         seq_printf(m, "%u\n", sbi->ll_sa_max);
 744         return 0;
 745 }
 746
 747 static ssize_t ll_statahead_max_seq_write(struct file *file,
 748                                           const char __user *buffer,
 749                                           size_t count, loff_t *off)
 750 {
 751         struct seq_file *m = file->private_data;
 752         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 753         unsigned int val;
 754         int rc;
 755
 756         rc = kstrtouint_from_user(buffer, count, 0, &val);
 757         if (rc)
 758                 return rc;
 759
 760         if (val <= LL_SA_RPC_MAX)
 761                 sbi->ll_sa_max = val;
 762         else
 763                 CERROR("Bad statahead_max value %u. Valid values are in "
 764                        "the range [0, %d]\n", val, LL_SA_RPC_MAX);
 765
 766         return count;
 767 }
 768 LPROC_SEQ_FOPS(ll_statahead_max);
 769
 770 static int ll_statahead_agl_seq_show(struct seq_file *m, void *v)
 771 {
 772         struct super_block *sb = m->private;
 773         struct ll_sb_info *sbi = ll_s2sbi(sb);
 774
 775         seq_printf(m, "%u\n",
 776                    sbi->ll_flags & LL_SBI_AGL_ENABLED ? 1 : 0);
 777         return 0;
 778 }
 779
 780 static ssize_t ll_statahead_agl_seq_write(struct file *file,
 781                                           const char __user *buffer,
 782                                           size_t count, loff_t *off)
 783 {
 784         struct seq_file *m = file->private_data;
 785         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 786         bool val;
 787         int rc;
 788
 789         rc = kstrtobool_from_user(buffer, count, &val);
 790         if (rc)
 791                 return rc;
 792
 793         if (val)
 794                 sbi->ll_flags |= LL_SBI_AGL_ENABLED;
 795         else
 796                 sbi->ll_flags &= ~LL_SBI_AGL_ENABLED;
 797
 798         return count;
 799 }
 800 LPROC_SEQ_FOPS(ll_statahead_agl);
 801
 802 static int ll_statahead_stats_seq_show(struct seq_file *m, void *v)
 803 {
 804         struct super_block *sb = m->private;
 805         struct ll_sb_info *sbi = ll_s2sbi(sb);
 806
 807         seq_printf(m, "statahead total: %u\n"
 808                     "statahead wrong: %u\n"
 809                     "agl total: %u\n",
 810                     atomic_read(&sbi->ll_sa_total),
 811                     atomic_read(&sbi->ll_sa_wrong),
 812                     atomic_read(&sbi->ll_agl_total));
 813         return 0;
 814 }
 815 LPROC_SEQ_FOPS_RO(ll_statahead_stats);
 816
 817 static int ll_lazystatfs_seq_show(struct seq_file *m, void *v)
 818 {
 819         struct super_block *sb = m->private;
 820         struct ll_sb_info *sbi = ll_s2sbi(sb);
 821
 822         seq_printf(m, "%u\n",
 823                    (sbi->ll_flags & LL_SBI_LAZYSTATFS) ? 1 : 0);
 824         return 0;
 825 }
 826
 827 static ssize_t ll_lazystatfs_seq_write(struct file *file,
 828                                        const char __user *buffer,
 829                                         size_t count, loff_t *off)
 830 {
 831         struct seq_file *m = file->private_data;
 832         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 833         bool val;
 834         int rc;
 835
 836         rc = kstrtobool_from_user(buffer, count, &val);
 837         if (rc)
 838                 return rc;
 839
 840         if (val)
 841                 sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 842         else
 843                 sbi->ll_flags &= ~LL_SBI_LAZYSTATFS;
 844
 845         return count;
 846 }
 847 LPROC_SEQ_FOPS(ll_lazystatfs);
 848
 849 static int ll_max_easize_seq_show(struct seq_file *m, void *v)
 850 {
 851         struct super_block *sb = m->private;
 852         struct ll_sb_info *sbi = ll_s2sbi(sb);
 853         unsigned int ealen;
 854         int rc;
 855
 856         rc = ll_get_max_mdsize(sbi, &ealen);
 857         if (rc)
 858                 return rc;
 859
 860         seq_printf(m, "%u\n", ealen);
 861         return 0;
 862 }
 863 LPROC_SEQ_FOPS_RO(ll_max_easize);
 864
 865 /**
 866  * Get default_easize.
 867  *
 868  * \see client_obd::cl_default_mds_easize
 869  *
 870  * \param[in] m         seq_file handle
 871  * \param[in] v         unused for single entry
 872  *
 873  * \retval 0            on success
 874  * \retval negative     negated errno on failure
 875  */
 876 static int ll_default_easize_seq_show(struct seq_file *m, void *v)
 877 {
 878         struct super_block *sb = m->private;
 879         struct ll_sb_info *sbi = ll_s2sbi(sb);
 880         unsigned int ealen;
 881         int rc;
 882
 883         rc = ll_get_default_mdsize(sbi, &ealen);
 884         if (rc)
 885                 return rc;
 886
 887         seq_printf(m, "%u\n", ealen);
 888         return 0;
 889 }
 890
 891 /**
 892  * Set default_easize.
 893  *
 894  * Range checking on the passed value is handled by
 895  * ll_set_default_mdsize().
 896  *
 897  * \see client_obd::cl_default_mds_easize
 898  *
 899  * \param[in] file      proc file
 900  * \param[in] buffer    string passed from user space
 901  * \param[in] count     \a buffer length
 902  * \param[in] off       unused for single entry
 903  *
 904  * \retval positive     \a count on success
 905  * \retval negative     negated errno on failure
 906  */
 907 static ssize_t ll_default_easize_seq_write(struct file *file,
 908                                            const char __user *buffer,
 909                                            size_t count, loff_t *unused)
 910 {
 911         struct seq_file *seq = file->private_data;
 912         struct super_block *sb = (struct super_block *)seq->private;
 913         struct ll_sb_info *sbi = ll_s2sbi(sb);
 914         unsigned int val;
 915         int rc;
 916
 917         if (count == 0)
 918                 return 0;
 919
 920         rc = kstrtouint_from_user(buffer, count, 0, &val);
 921         if (rc)
 922                 return rc;
 923
 924         rc = ll_set_default_mdsize(sbi, val);
 925         if (rc)
 926                 return rc;
 927
 928         return count;
 929 }
 930 LPROC_SEQ_FOPS(ll_default_easize);
 931
 932 static int ll_sbi_flags_seq_show(struct seq_file *m, void *v)
 933 {
 934         const char *str[] = LL_SBI_FLAGS;
 935         struct super_block *sb = m->private;
 936         int flags = ll_s2sbi(sb)->ll_flags;
 937         int i = 0;
 938
 939         while (flags != 0) {
 940                 if (ARRAY_SIZE(str) <= i) {
 941                         CERROR("%s: Revise array LL_SBI_FLAGS to match sbi "
 942                                 "flags please.\n", ll_get_fsname(sb, NULL, 0));
 943                         return -EINVAL;
 944                 }
 945
 946                 if (flags & 0x1)
 947                         seq_printf(m, "%s ", str[i]);
 948                 flags >>= 1;
 949                 ++i;
 950         }
 951         seq_printf(m, "\b\n");
 952         return 0;
 953 }
 954 LPROC_SEQ_FOPS_RO(ll_sbi_flags);
 955
 956 static int ll_tiny_write_seq_show(struct seq_file *m, void *v)
 957 {
 958         struct super_block *sb = m->private;
 959         struct ll_sb_info *sbi = ll_s2sbi(sb);
 960
 961         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_TINY_WRITE));
 962         return 0;
 963 }
 964
 965 static ssize_t ll_tiny_write_seq_write(
 966         struct file *file, const char __user *buffer, size_t count, loff_t *off)
 967 {
 968         struct seq_file *m = file->private_data;
 969         struct super_block *sb = m->private;
 970         struct ll_sb_info *sbi = ll_s2sbi(sb);
 971         bool val;
 972         int rc;
 973
 974         rc = kstrtobool_from_user(buffer, count, &val);
 975         if (rc)
 976                 return rc;
 977
 978         spin_lock(&sbi->ll_lock);
 979         if (val)
 980                 sbi->ll_flags |= LL_SBI_TINY_WRITE;
 981         else
 982                 sbi->ll_flags &= ~LL_SBI_TINY_WRITE;
 983         spin_unlock(&sbi->ll_lock);
 984
 985         return count;
 986 }
 987 LPROC_SEQ_FOPS(ll_tiny_write);
 988
 989 static int ll_fast_read_seq_show(struct seq_file *m, void *v)
 990 {
 991         struct super_block *sb = m->private;
 992         struct ll_sb_info *sbi = ll_s2sbi(sb);
 993
 994         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_FAST_READ));
 995         return 0;
 996 }
 997
 998 static ssize_t
 999 ll_fast_read_seq_write(struct file *file, const char __user *buffer,
1000                        size_t count, loff_t *off)
1001 {
1002         struct seq_file *m = file->private_data;
1003         struct super_block *sb = m->private;
1004         struct ll_sb_info *sbi = ll_s2sbi(sb);
1005         bool val;
1006         int rc;
1007
1008         rc = kstrtobool_from_user(buffer, count, &val);
1009         if (rc)
1010                 return rc;
1011
1012         spin_lock(&sbi->ll_lock);
1013         if (val)
1014                 sbi->ll_flags |= LL_SBI_FAST_READ;
1015         else
1016                 sbi->ll_flags &= ~LL_SBI_FAST_READ;
1017         spin_unlock(&sbi->ll_lock);
1018
1019         return count;
1020 }
1021 LPROC_SEQ_FOPS(ll_fast_read);
1022
1023 static int ll_pio_seq_show(struct seq_file *m, void *v)
1024 {
1025         struct super_block *sb = m->private;
1026         struct ll_sb_info *sbi = ll_s2sbi(sb);
1027
1028         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_PIO));
1029         return 0;
1030 }
1031
1032 static ssize_t ll_pio_seq_write(struct file *file, const char __user *buffer,
1033                                 size_t count, loff_t *off)
1034 {
1035         struct seq_file *m = file->private_data;
1036         struct super_block *sb = m->private;
1037         struct ll_sb_info *sbi = ll_s2sbi(sb);
1038         bool val;
1039         int rc;
1040
1041         rc = kstrtobool_from_user(buffer, count, &val);
1042         if (rc)
1043                 return rc;
1044
1045         spin_lock(&sbi->ll_lock);
1046         if (val)
1047                 sbi->ll_flags |= LL_SBI_PIO;
1048         else
1049                 sbi->ll_flags &= ~LL_SBI_PIO;
1050         spin_unlock(&sbi->ll_lock);
1051
1052         return count;
1053 }
1054 LPROC_SEQ_FOPS(ll_pio);
1055
1056 static int ll_unstable_stats_seq_show(struct seq_file *m, void *v)
1057 {
1058         struct super_block      *sb    = m->private;
1059         struct ll_sb_info       *sbi   = ll_s2sbi(sb);
1060         struct cl_client_cache  *cache = sbi->ll_cache;
1061         long pages;
1062         int mb;
1063
1064         pages = atomic_long_read(&cache->ccc_unstable_nr);
1065         mb    = (pages * PAGE_SIZE) >> 20;
1066
1067         seq_printf(m, "unstable_check:     %8d\n"
1068                    "unstable_pages: %12ld\n"
1069                    "unstable_mb:        %8d\n",
1070                    cache->ccc_unstable_check, pages, mb);
1071         return 0;
1072 }
1073
1074 static ssize_t ll_unstable_stats_seq_write(struct file *file,
1075                                            const char __user *buffer,
1076                                            size_t count, loff_t *unused)
1077 {
1078         struct seq_file *seq = file->private_data;
1079         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)seq->private);
1080         char kernbuf[128];
1081         bool val;
1082         int rc;
1083
1084         if (count == 0)
1085                 return 0;
1086         if (count >= sizeof(kernbuf))
1087                 return -EINVAL;
1088
1089         if (copy_from_user(kernbuf, buffer, count))
1090                 return -EFAULT;
1091         kernbuf[count] = 0;
1092
1093         buffer += lprocfs_find_named_value(kernbuf, "unstable_check:", &count) -
1094                   kernbuf;
1095         rc = kstrtobool_from_user(buffer, count, &val);
1096         if (rc < 0)
1097                 return rc;
1098
1099         /* borrow lru lock to set the value */
1100         spin_lock(&sbi->ll_cache->ccc_lru_lock);
1101         sbi->ll_cache->ccc_unstable_check = val;
1102         spin_unlock(&sbi->ll_cache->ccc_lru_lock);
1103
1104         return count;
1105 }
1106 LPROC_SEQ_FOPS(ll_unstable_stats);
1107
1108 static int ll_root_squash_seq_show(struct seq_file *m, void *v)
1109 {
1110         struct super_block *sb = m->private;
1111         struct ll_sb_info *sbi = ll_s2sbi(sb);
1112         struct root_squash_info *squash = &sbi->ll_squash;
1113
1114         seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
1115         return 0;
1116 }
1117
1118 static ssize_t ll_root_squash_seq_write(struct file *file,
1119                                         const char __user *buffer,
1120                                         size_t count, loff_t *off)
1121 {
1122         struct seq_file *m = file->private_data;
1123         struct super_block *sb = m->private;
1124         struct ll_sb_info *sbi = ll_s2sbi(sb);
1125         struct root_squash_info *squash = &sbi->ll_squash;
1126
1127         return lprocfs_wr_root_squash(buffer, count, squash,
1128                                       ll_get_fsname(sb, NULL, 0));
1129 }
1130 LPROC_SEQ_FOPS(ll_root_squash);
1131
1132 static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
1133 {
1134         struct super_block *sb = m->private;
1135         struct ll_sb_info *sbi = ll_s2sbi(sb);
1136         struct root_squash_info *squash = &sbi->ll_squash;
1137         int len;
1138
1139         down_read(&squash->rsi_sem);
1140         if (!list_empty(&squash->rsi_nosquash_nids)) {
1141                 len = cfs_print_nidlist(m->buf + m->count, m->size - m->count,
1142                                         &squash->rsi_nosquash_nids);
1143                 m->count += len;
1144                 seq_putc(m, '\n');
1145         } else {
1146                 seq_puts(m, "NONE\n");
1147         }
1148         up_read(&squash->rsi_sem);
1149
1150         return 0;
1151 }
1152
1153 static ssize_t ll_nosquash_nids_seq_write(struct file *file,
1154                                           const char __user *buffer,
1155                                           size_t count, loff_t *off)
1156 {
1157         struct seq_file *m = file->private_data;
1158         struct super_block *sb = m->private;
1159         struct ll_sb_info *sbi = ll_s2sbi(sb);
1160         struct root_squash_info *squash = &sbi->ll_squash;
1161         int rc;
1162
1163         rc = lprocfs_wr_nosquash_nids(buffer, count, squash,
1164                                       ll_get_fsname(sb, NULL, 0));
1165         if (rc < 0)
1166                 return rc;
1167
1168         ll_compute_rootsquash_state(sbi);
1169
1170         return rc;
1171 }
1172 LPROC_SEQ_FOPS(ll_nosquash_nids);
1173
1174 struct lprocfs_vars lprocfs_llite_obd_vars[] = {
1175         { .name =       "site",
1176           .fops =       &ll_site_stats_fops                     },
1177         { .name =       "stat_blocksize",
1178           .fops =       &ll_stat_blksize_fops                   },
1179         { .name =       "max_read_ahead_mb",
1180           .fops =       &ll_max_readahead_mb_fops               },
1181         { .name =       "max_read_ahead_per_file_mb",
1182           .fops =       &ll_max_readahead_per_file_mb_fops      },
1183         { .name =       "max_read_ahead_whole_mb",
1184           .fops =       &ll_max_read_ahead_whole_mb_fops        },
1185         { .name =       "max_cached_mb",
1186           .fops =       &ll_max_cached_mb_fops                  },
1187         { .name =       "stats_track_pid",
1188           .fops =       &ll_track_pid_fops                      },
1189         { .name =       "stats_track_ppid",
1190           .fops =       &ll_track_ppid_fops                     },
1191         { .name =       "stats_track_gid",
1192           .fops =       &ll_track_gid_fops                      },
1193         { .name =       "statahead_max",
1194           .fops =       &ll_statahead_max_fops                  },
1195         { .name =       "statahead_agl",
1196           .fops =       &ll_statahead_agl_fops                  },
1197         { .name =       "statahead_stats",
1198           .fops =       &ll_statahead_stats_fops                },
1199         { .name =       "lazystatfs",
1200           .fops =       &ll_lazystatfs_fops                     },
1201         { .name =       "max_easize",
1202           .fops =       &ll_max_easize_fops                     },
1203         { .name =       "default_easize",
1204           .fops =       &ll_default_easize_fops                 },
1205         { .name =       "sbi_flags",
1206           .fops =       &ll_sbi_flags_fops                      },
1207         { .name =       "xattr_cache",
1208           .fops =       &ll_xattr_cache_fops                    },
1209         { .name =       "unstable_stats",
1210           .fops =       &ll_unstable_stats_fops                 },
1211         { .name =       "root_squash",
1212           .fops =       &ll_root_squash_fops                    },
1213         { .name =       "nosquash_nids",
1214           .fops =       &ll_nosquash_nids_fops                  },
1215         { .name =       "fast_read",
1216           .fops =       &ll_fast_read_fops,                     },
1217         { .name =       "pio",
1218           .fops =       &ll_pio_fops,                           },
1219         { .name =       "tiny_write",
1220           .fops =       &ll_tiny_write_fops,                    },
1221         { NULL }
1222 };
1223
1224 #define MAX_STRING_SIZE 128
1225
1226 static struct attribute *llite_attrs[] = {
1227         &lustre_attr_blocksize.attr,
1228         &lustre_attr_kbytestotal.attr,
1229         &lustre_attr_kbytesfree.attr,
1230         &lustre_attr_kbytesavail.attr,
1231         &lustre_attr_filestotal.attr,
1232         &lustre_attr_filesfree.attr,
1233         &lustre_attr_client_type.attr,
1234         &lustre_attr_fstype.attr,
1235         &lustre_attr_uuid.attr,
1236         &lustre_attr_checksum_pages.attr,
1237         &lustre_attr_statahead_running_max.attr,
1238         NULL,
1239 };
1240
1241 static void llite_kobj_release(struct kobject *kobj)
1242 {
1243         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1244                                               ll_kset.kobj);
1245         complete(&sbi->ll_kobj_unregister);
1246 }
1247
1248 static struct kobj_type llite_ktype = {
1249         .default_attrs  = llite_attrs,
1250         .sysfs_ops      = &lustre_sysfs_ops,
1251         .release        = llite_kobj_release,
1252 };
1253
1254 static const struct llite_file_opcode {
1255         __u32       opcode;
1256         __u32       type;
1257         const char *opname;
1258 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
1259         /* file operation */
1260         { LPROC_LL_DIRTY_HITS,     LPROCFS_TYPE_REGS, "dirty_pages_hits" },
1261         { LPROC_LL_DIRTY_MISSES,   LPROCFS_TYPE_REGS, "dirty_pages_misses" },
1262         { LPROC_LL_READ_BYTES,     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1263                                    "read_bytes" },
1264         { LPROC_LL_WRITE_BYTES,    LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1265                                    "write_bytes" },
1266         { LPROC_LL_BRW_READ,       LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1267                                    "brw_read" },
1268         { LPROC_LL_BRW_WRITE,      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1269                                    "brw_write" },
1270         { LPROC_LL_IOCTL,          LPROCFS_TYPE_REGS, "ioctl" },
1271         { LPROC_LL_OPEN,           LPROCFS_TYPE_REGS, "open" },
1272         { LPROC_LL_RELEASE,        LPROCFS_TYPE_REGS, "close" },
1273         { LPROC_LL_MAP,            LPROCFS_TYPE_REGS, "mmap" },
1274         { LPROC_LL_FAULT,          LPROCFS_TYPE_REGS, "page_fault" },
1275         { LPROC_LL_MKWRITE,        LPROCFS_TYPE_REGS, "page_mkwrite" },
1276         { LPROC_LL_LLSEEK,         LPROCFS_TYPE_REGS, "seek" },
1277         { LPROC_LL_FSYNC,          LPROCFS_TYPE_REGS, "fsync" },
1278         { LPROC_LL_READDIR,        LPROCFS_TYPE_REGS, "readdir" },
1279         /* inode operation */
1280         { LPROC_LL_SETATTR,        LPROCFS_TYPE_REGS, "setattr" },
1281         { LPROC_LL_TRUNC,          LPROCFS_TYPE_REGS, "truncate" },
1282         { LPROC_LL_FLOCK,          LPROCFS_TYPE_REGS, "flock" },
1283         { LPROC_LL_GETATTR,        LPROCFS_TYPE_REGS, "getattr" },
1284         /* dir inode operation */
1285         { LPROC_LL_CREATE,         LPROCFS_TYPE_REGS, "create" },
1286         { LPROC_LL_LINK,           LPROCFS_TYPE_REGS, "link" },
1287         { LPROC_LL_UNLINK,         LPROCFS_TYPE_REGS, "unlink" },
1288         { LPROC_LL_SYMLINK,        LPROCFS_TYPE_REGS, "symlink" },
1289         { LPROC_LL_MKDIR,          LPROCFS_TYPE_REGS, "mkdir" },
1290         { LPROC_LL_RMDIR,          LPROCFS_TYPE_REGS, "rmdir" },
1291         { LPROC_LL_MKNOD,          LPROCFS_TYPE_REGS, "mknod" },
1292         { LPROC_LL_RENAME,         LPROCFS_TYPE_REGS, "rename" },
1293         /* special inode operation */
1294         { LPROC_LL_STAFS,          LPROCFS_TYPE_REGS, "statfs" },
1295         { LPROC_LL_ALLOC_INODE,    LPROCFS_TYPE_REGS, "alloc_inode" },
1296         { LPROC_LL_SETXATTR,       LPROCFS_TYPE_REGS, "setxattr" },
1297         { LPROC_LL_GETXATTR,       LPROCFS_TYPE_REGS, "getxattr" },
1298         { LPROC_LL_GETXATTR_HITS,  LPROCFS_TYPE_REGS, "getxattr_hits" },
1299         { LPROC_LL_LISTXATTR,      LPROCFS_TYPE_REGS, "listxattr" },
1300         { LPROC_LL_REMOVEXATTR,    LPROCFS_TYPE_REGS, "removexattr" },
1301         { LPROC_LL_INODE_PERM,     LPROCFS_TYPE_REGS, "inode_permission" },
1302 };
1303
1304 void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
1305 {
1306         if (!sbi->ll_stats)
1307                 return;
1308         if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
1309                 lprocfs_counter_add(sbi->ll_stats, op, count);
1310         else if (sbi->ll_stats_track_type == STATS_TRACK_PID &&
1311                  sbi->ll_stats_track_id == current->pid)
1312                 lprocfs_counter_add(sbi->ll_stats, op, count);
1313         else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
1314                  sbi->ll_stats_track_id == current->parent->pid)
1315                 lprocfs_counter_add(sbi->ll_stats, op, count);
1316         else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
1317                  sbi->ll_stats_track_id ==
1318                         from_kgid(&init_user_ns, current_gid()))
1319                 lprocfs_counter_add(sbi->ll_stats, op, count);
1320 }
1321 EXPORT_SYMBOL(ll_stats_ops_tally);
1322
1323 static const char *ra_stat_string[] = {
1324         [RA_STAT_HIT] = "hits",
1325         [RA_STAT_MISS] = "misses",
1326         [RA_STAT_DISTANT_READPAGE] = "readpage not consecutive",
1327         [RA_STAT_MISS_IN_WINDOW] = "miss inside window",
1328         [RA_STAT_FAILED_GRAB_PAGE] = "failed grab_cache_page",
1329         [RA_STAT_FAILED_MATCH] = "failed lock match",
1330         [RA_STAT_DISCARDED] = "read but discarded",
1331         [RA_STAT_ZERO_LEN] = "zero length file",
1332         [RA_STAT_ZERO_WINDOW] = "zero size window",
1333         [RA_STAT_EOF] = "read-ahead to EOF",
1334         [RA_STAT_MAX_IN_FLIGHT] = "hit max r-a issue",
1335         [RA_STAT_WRONG_GRAB_PAGE] = "wrong page from grab_cache_page",
1336         [RA_STAT_FAILED_REACH_END] = "failed to reach end"
1337 };
1338
1339 LPROC_SEQ_FOPS_RO_TYPE(llite, name);
1340 LPROC_SEQ_FOPS_RO_TYPE(llite, uuid);
1341
1342 int ll_debugfs_register_super(struct super_block *sb, const char *name)
1343 {
1344         struct lustre_sb_info *lsi = s2lsi(sb);
1345         struct ll_sb_info *sbi = ll_s2sbi(sb);
1346         struct lprocfs_vars lvars[2];
1347         int err, id, rc;
1348
1349         ENTRY;
1350         memset(lvars, 0, sizeof(lvars));
1351         lvars[0].name = name;
1352
1353         LASSERT(sbi != NULL);
1354
1355         sbi->ll_proc_root = lprocfs_register(name, proc_lustre_fs_root,
1356                                              NULL, NULL);
1357         if (IS_ERR(sbi->ll_proc_root)) {
1358                 err = PTR_ERR(sbi->ll_proc_root);
1359                 sbi->ll_proc_root = NULL;
1360                 RETURN(err);
1361         }
1362
1363         rc = lprocfs_seq_create(sbi->ll_proc_root, "dump_page_cache", 0444,
1364                                 &vvp_dump_pgcache_file_ops, sbi);
1365         if (rc)
1366                 CWARN("Error adding the dump_page_cache file\n");
1367
1368         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats", 0644,
1369                                 &ll_rw_extents_stats_fops, sbi);
1370         if (rc)
1371                 CWARN("Error adding the extent_stats file\n");
1372
1373         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats_per_process",
1374                                 0644, &ll_rw_extents_stats_pp_fops, sbi);
1375         if (rc)
1376                 CWARN("Error adding the extents_stats_per_process file\n");
1377
1378         rc = lprocfs_seq_create(sbi->ll_proc_root, "offset_stats", 0644,
1379                                 &ll_rw_offset_stats_fops, sbi);
1380         if (rc)
1381                 CWARN("Error adding the offset_stats file\n");
1382
1383         /* File operations stats */
1384         sbi->ll_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES,
1385                                             LPROCFS_STATS_FLAG_NONE);
1386         if (sbi->ll_stats == NULL)
1387                 GOTO(out_proc, err = -ENOMEM);
1388
1389         /* do counter init */
1390         for (id = 0; id < LPROC_LL_FILE_OPCODES; id++) {
1391                 __u32 type = llite_opcode_table[id].type;
1392                 void *ptr = NULL;
1393                 if (type & LPROCFS_TYPE_REGS)
1394                         ptr = "regs";
1395                 else if (type & LPROCFS_TYPE_BYTES)
1396                         ptr = "bytes";
1397                 else if (type & LPROCFS_TYPE_PAGES)
1398                         ptr = "pages";
1399                 lprocfs_counter_init(sbi->ll_stats,
1400                                      llite_opcode_table[id].opcode,
1401                                      (type & LPROCFS_CNTR_AVGMINMAX),
1402                                      llite_opcode_table[id].opname, ptr);
1403         }
1404
1405         err = lprocfs_register_stats(sbi->ll_proc_root, "stats", sbi->ll_stats);
1406         if (err)
1407                 GOTO(out_stats, err);
1408
1409         sbi->ll_ra_stats = lprocfs_alloc_stats(ARRAY_SIZE(ra_stat_string),
1410                                                LPROCFS_STATS_FLAG_NONE);
1411         if (sbi->ll_ra_stats == NULL)
1412                 GOTO(out_stats, err = -ENOMEM);
1413
1414         for (id = 0; id < ARRAY_SIZE(ra_stat_string); id++)
1415                 lprocfs_counter_init(sbi->ll_ra_stats, id, 0,
1416                                      ra_stat_string[id], "pages");
1417         err = lprocfs_register_stats(sbi->ll_proc_root, "read_ahead_stats",
1418                                      sbi->ll_ra_stats);
1419         if (err)
1420                 GOTO(out_ra_stats, err);
1421
1422         err = lprocfs_add_vars(sbi->ll_proc_root, lprocfs_llite_obd_vars, sb);
1423         if (err)
1424                 GOTO(out_ra_stats, err);
1425
1426         /* Yes we also register sysfs mount kset here as well */
1427         sbi->ll_kset.kobj.parent = llite_kobj;
1428         sbi->ll_kset.kobj.ktype = &llite_ktype;
1429         init_completion(&sbi->ll_kobj_unregister);
1430         err = kobject_set_name(&sbi->ll_kset.kobj, "%s", name);
1431         if (err)
1432                 GOTO(out_ra_stats, err);
1433
1434         err = kset_register(&sbi->ll_kset);
1435         if (err)
1436                 GOTO(out_ra_stats, err);
1437
1438         lsi->lsi_kobj = kobject_get(&sbi->ll_kset.kobj);
1439
1440         RETURN(0);
1441 out_ra_stats:
1442         lprocfs_free_stats(&sbi->ll_ra_stats);
1443 out_stats:
1444         lprocfs_free_stats(&sbi->ll_stats);
1445 out_proc:
1446         lprocfs_remove(&sbi->ll_proc_root);
1447
1448         RETURN(err);
1449 }
1450
1451 int lprocfs_ll_register_obd(struct super_block *sb, const char *obdname)
1452 {
1453         struct lprocfs_vars lvars[2];
1454         struct ll_sb_info *sbi = ll_s2sbi(sb);
1455         struct obd_device *obd;
1456         struct proc_dir_entry *dir;
1457         char name[MAX_STRING_SIZE + 1];
1458         int err;
1459         ENTRY;
1460
1461         memset(lvars, 0, sizeof(lvars));
1462
1463         name[MAX_STRING_SIZE] = '\0';
1464         lvars[0].name = name;
1465
1466         LASSERT(sbi != NULL);
1467         LASSERT(obdname != NULL);
1468
1469         obd = class_name2obd(obdname);
1470
1471         LASSERT(obd != NULL);
1472         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1473         LASSERT(obd->obd_type->typ_name != NULL);
1474
1475         dir = proc_mkdir(obd->obd_type->typ_name, sbi->ll_proc_root);
1476         if (dir == NULL)
1477                 GOTO(out, err = -ENOMEM);
1478
1479         snprintf(name, MAX_STRING_SIZE, "common_name");
1480         lvars[0].fops = &llite_name_fops;
1481         err = lprocfs_add_vars(dir, lvars, obd);
1482         if (err)
1483                 GOTO(out, err);
1484
1485         snprintf(name, MAX_STRING_SIZE, "uuid");
1486         lvars[0].fops = &llite_uuid_fops;
1487         err = lprocfs_add_vars(dir, lvars, obd);
1488         if (err)
1489                 GOTO(out, err);
1490
1491 out:
1492         if (err) {
1493                 lprocfs_remove(&sbi->ll_proc_root);
1494                 lprocfs_free_stats(&sbi->ll_ra_stats);
1495                 lprocfs_free_stats(&sbi->ll_stats);
1496         }
1497         RETURN(err);
1498 }
1499
1500 void ll_debugfs_unregister_super(struct super_block *sb)
1501 {
1502         struct lustre_sb_info *lsi = s2lsi(sb);
1503         struct ll_sb_info *sbi = ll_s2sbi(sb);
1504
1505         kobject_put(lsi->lsi_kobj);
1506
1507         kset_unregister(&sbi->ll_kset);
1508         wait_for_completion(&sbi->ll_kobj_unregister);
1509
1510         if (sbi->ll_proc_root) {
1511                 lprocfs_remove(&sbi->ll_proc_root);
1512                 lprocfs_free_stats(&sbi->ll_ra_stats);
1513                 lprocfs_free_stats(&sbi->ll_stats);
1514         }
1515 }
1516 #undef MAX_STRING_SIZE
1517
1518 #define pct(a,b) (b ? a * 100 / b : 0)
1519
1520 static void ll_display_extents_info(struct ll_rw_extents_info *io_extents,
1521                                    struct seq_file *seq, int which)
1522 {
1523         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
1524         unsigned long start, end, r, w;
1525         char *unitp = "KMGTPEZY";
1526         int i, units = 10;
1527         struct per_process_info *pp_info = &io_extents->pp_extents[which];
1528
1529         read_cum = 0;
1530         write_cum = 0;
1531         start = 0;
1532
1533         for(i = 0; i < LL_HIST_MAX; i++) {
1534                 read_tot += pp_info->pp_r_hist.oh_buckets[i];
1535                 write_tot += pp_info->pp_w_hist.oh_buckets[i];
1536         }
1537
1538         for(i = 0; i < LL_HIST_MAX; i++) {
1539                 r = pp_info->pp_r_hist.oh_buckets[i];
1540                 w = pp_info->pp_w_hist.oh_buckets[i];
1541                 read_cum += r;
1542                 write_cum += w;
1543                 end = 1 << (i + LL_HIST_START - units);
1544                 seq_printf(seq, "%4lu%c - %4lu%c%c: %14lu %4lu %4lu  | "
1545                            "%14lu %4lu %4lu\n", start, *unitp, end, *unitp,
1546                            (i == LL_HIST_MAX - 1) ? '+' : ' ',
1547                            r, pct(r, read_tot), pct(read_cum, read_tot),
1548                            w, pct(w, write_tot), pct(write_cum, write_tot));
1549                 start = end;
1550                 if (start == 1<<10) {
1551                         start = 1;
1552                         units += 10;
1553                         unitp++;
1554                 }
1555                 if (read_cum == read_tot && write_cum == write_tot)
1556                         break;
1557         }
1558 }
1559
1560 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
1561 {
1562         struct timespec64 now;
1563         struct ll_sb_info *sbi = seq->private;
1564         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1565         int k;
1566
1567         ktime_get_real_ts64(&now);
1568
1569         if (!sbi->ll_rw_stats_on) {
1570                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1571                 return 0;
1572         }
1573         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1574                    (s64)now.tv_sec, now.tv_nsec);
1575         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1576         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1577                    "extents", "calls", "%", "cum%",
1578                    "calls", "%", "cum%");
1579         spin_lock(&sbi->ll_pp_extent_lock);
1580         for (k = 0; k < LL_PROCESS_HIST_MAX; k++) {
1581                 if (io_extents->pp_extents[k].pid != 0) {
1582                         seq_printf(seq, "\nPID: %d\n",
1583                                    io_extents->pp_extents[k].pid);
1584                         ll_display_extents_info(io_extents, seq, k);
1585                 }
1586         }
1587         spin_unlock(&sbi->ll_pp_extent_lock);
1588         return 0;
1589 }
1590
1591 static ssize_t ll_rw_extents_stats_pp_seq_write(struct file *file,
1592                                                 const char __user *buf,
1593                                                 size_t len,
1594                                                 loff_t *off)
1595 {
1596         struct seq_file *seq = file->private_data;
1597         struct ll_sb_info *sbi = seq->private;
1598         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1599         int i;
1600         __s64 value;
1601
1602         if (len == 0)
1603                 return -EINVAL;
1604
1605         value = ll_stats_pid_write(buf, len);
1606
1607         if (value == 0)
1608                 sbi->ll_rw_stats_on = 0;
1609         else
1610                 sbi->ll_rw_stats_on = 1;
1611
1612         spin_lock(&sbi->ll_pp_extent_lock);
1613         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1614                 io_extents->pp_extents[i].pid = 0;
1615                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1616                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1617         }
1618         spin_unlock(&sbi->ll_pp_extent_lock);
1619         return len;
1620 }
1621
1622 LPROC_SEQ_FOPS(ll_rw_extents_stats_pp);
1623
1624 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
1625 {
1626         struct timespec64 now;
1627         struct ll_sb_info *sbi = seq->private;
1628         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1629
1630         ktime_get_real_ts64(&now);
1631
1632         if (!sbi->ll_rw_stats_on) {
1633                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1634                 return 0;
1635         }
1636         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1637                    (s64)now.tv_sec, now.tv_nsec);
1638
1639         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1640         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1641                    "extents", "calls", "%", "cum%",
1642                    "calls", "%", "cum%");
1643         spin_lock(&sbi->ll_lock);
1644         ll_display_extents_info(io_extents, seq, LL_PROCESS_HIST_MAX);
1645         spin_unlock(&sbi->ll_lock);
1646
1647         return 0;
1648 }
1649
1650 static ssize_t ll_rw_extents_stats_seq_write(struct file *file,
1651                                              const char __user *buf,
1652                                              size_t len, loff_t *off)
1653 {
1654         struct seq_file *seq = file->private_data;
1655         struct ll_sb_info *sbi = seq->private;
1656         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1657         int i;
1658         __s64 value;
1659
1660         if (len == 0)
1661                 return -EINVAL;
1662
1663         value = ll_stats_pid_write(buf, len);
1664
1665         if (value == 0)
1666                 sbi->ll_rw_stats_on = 0;
1667         else
1668                 sbi->ll_rw_stats_on = 1;
1669
1670         spin_lock(&sbi->ll_pp_extent_lock);
1671         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
1672                 io_extents->pp_extents[i].pid = 0;
1673                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1674                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1675         }
1676         spin_unlock(&sbi->ll_pp_extent_lock);
1677
1678         return len;
1679 }
1680 LPROC_SEQ_FOPS(ll_rw_extents_stats);
1681
1682 void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
1683                        struct ll_file_data *file, loff_t pos,
1684                        size_t count, int rw)
1685 {
1686         int i, cur = -1;
1687         struct ll_rw_process_info *process;
1688         struct ll_rw_process_info *offset;
1689         int *off_count = &sbi->ll_rw_offset_entry_count;
1690         int *process_count = &sbi->ll_offset_process_count;
1691         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1692
1693         if(!sbi->ll_rw_stats_on)
1694                 return;
1695         process = sbi->ll_rw_process_info;
1696         offset = sbi->ll_rw_offset_info;
1697
1698         spin_lock(&sbi->ll_pp_extent_lock);
1699         /* Extent statistics */
1700         for(i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1701                 if(io_extents->pp_extents[i].pid == pid) {
1702                         cur = i;
1703                         break;
1704                 }
1705         }
1706
1707         if (cur == -1) {
1708                 /* new process */
1709                 sbi->ll_extent_process_count =
1710                         (sbi->ll_extent_process_count + 1) % LL_PROCESS_HIST_MAX;
1711                 cur = sbi->ll_extent_process_count;
1712                 io_extents->pp_extents[cur].pid = pid;
1713                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_r_hist);
1714                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_w_hist);
1715         }
1716
1717         for(i = 0; (count >= (1 << LL_HIST_START << i)) &&
1718              (i < (LL_HIST_MAX - 1)); i++);
1719         if (rw == 0) {
1720                 io_extents->pp_extents[cur].pp_r_hist.oh_buckets[i]++;
1721                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_r_hist.oh_buckets[i]++;
1722         } else {
1723                 io_extents->pp_extents[cur].pp_w_hist.oh_buckets[i]++;
1724                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_w_hist.oh_buckets[i]++;
1725         }
1726         spin_unlock(&sbi->ll_pp_extent_lock);
1727
1728         spin_lock(&sbi->ll_process_lock);
1729         /* Offset statistics */
1730         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1731                 if (process[i].rw_pid == pid) {
1732                         if (process[i].rw_last_file != file) {
1733                                 process[i].rw_range_start = pos;
1734                                 process[i].rw_last_file_pos = pos + count;
1735                                 process[i].rw_smallest_extent = count;
1736                                 process[i].rw_largest_extent = count;
1737                                 process[i].rw_offset = 0;
1738                                 process[i].rw_last_file = file;
1739                                 spin_unlock(&sbi->ll_process_lock);
1740                                 return;
1741                         }
1742                         if (process[i].rw_last_file_pos != pos) {
1743                                 *off_count =
1744                                     (*off_count + 1) % LL_OFFSET_HIST_MAX;
1745                                 offset[*off_count].rw_op = process[i].rw_op;
1746                                 offset[*off_count].rw_pid = pid;
1747                                 offset[*off_count].rw_range_start =
1748                                         process[i].rw_range_start;
1749                                 offset[*off_count].rw_range_end =
1750                                         process[i].rw_last_file_pos;
1751                                 offset[*off_count].rw_smallest_extent =
1752                                         process[i].rw_smallest_extent;
1753                                 offset[*off_count].rw_largest_extent =
1754                                         process[i].rw_largest_extent;
1755                                 offset[*off_count].rw_offset =
1756                                         process[i].rw_offset;
1757                                 process[i].rw_op = rw;
1758                                 process[i].rw_range_start = pos;
1759                                 process[i].rw_smallest_extent = count;
1760                                 process[i].rw_largest_extent = count;
1761                                 process[i].rw_offset = pos -
1762                                         process[i].rw_last_file_pos;
1763                         }
1764                         if(process[i].rw_smallest_extent > count)
1765                                 process[i].rw_smallest_extent = count;
1766                         if(process[i].rw_largest_extent < count)
1767                                 process[i].rw_largest_extent = count;
1768                         process[i].rw_last_file_pos = pos + count;
1769                         spin_unlock(&sbi->ll_process_lock);
1770                         return;
1771                 }
1772         }
1773         *process_count = (*process_count + 1) % LL_PROCESS_HIST_MAX;
1774         process[*process_count].rw_pid = pid;
1775         process[*process_count].rw_op = rw;
1776         process[*process_count].rw_range_start = pos;
1777         process[*process_count].rw_last_file_pos = pos + count;
1778         process[*process_count].rw_smallest_extent = count;
1779         process[*process_count].rw_largest_extent = count;
1780         process[*process_count].rw_offset = 0;
1781         process[*process_count].rw_last_file = file;
1782         spin_unlock(&sbi->ll_process_lock);
1783 }
1784
1785 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
1786 {
1787         struct timespec64 now;
1788         struct ll_sb_info *sbi = seq->private;
1789         struct ll_rw_process_info *offset = sbi->ll_rw_offset_info;
1790         struct ll_rw_process_info *process = sbi->ll_rw_process_info;
1791         int i;
1792
1793         ktime_get_real_ts64(&now);
1794
1795         if (!sbi->ll_rw_stats_on) {
1796                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1797                 return 0;
1798         }
1799         spin_lock(&sbi->ll_process_lock);
1800
1801         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1802                    (s64)now.tv_sec, now.tv_nsec);
1803         seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
1804                    "R/W", "PID", "RANGE START", "RANGE END",
1805                    "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");
1806
1807         /* We stored the discontiguous offsets here; print them first */
1808         for (i = 0; i < LL_OFFSET_HIST_MAX; i++) {
1809                 if (offset[i].rw_pid != 0)
1810                         seq_printf(seq,
1811                                   "%3c %10d %14llu %14llu %17lu %17lu %14llu\n",
1812                                    offset[i].rw_op == READ ? 'R' : 'W',
1813                                    offset[i].rw_pid,
1814                                    offset[i].rw_range_start,
1815                                    offset[i].rw_range_end,
1816                                    (unsigned long)offset[i].rw_smallest_extent,
1817                                    (unsigned long)offset[i].rw_largest_extent,
1818                                    offset[i].rw_offset);
1819         }
1820
1821         /* Then print the current offsets for each process */
1822         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1823                 if (process[i].rw_pid != 0)
1824                         seq_printf(seq,
1825                                   "%3c %10d %14llu %14llu %17lu %17lu %14llu\n",
1826                                    process[i].rw_op == READ ? 'R' : 'W',
1827                                    process[i].rw_pid,
1828                                    process[i].rw_range_start,
1829                                    process[i].rw_last_file_pos,
1830                                    (unsigned long)process[i].rw_smallest_extent,
1831                                    (unsigned long)process[i].rw_largest_extent,
1832                                    process[i].rw_offset);
1833         }
1834         spin_unlock(&sbi->ll_process_lock);
1835
1836         return 0;
1837 }
1838
1839 static ssize_t ll_rw_offset_stats_seq_write(struct file *file,
1840                                             const char __user *buf,
1841                                             size_t len, loff_t *off)
1842 {
1843         struct seq_file *seq = file->private_data;
1844         struct ll_sb_info *sbi = seq->private;
1845         struct ll_rw_process_info *process_info = sbi->ll_rw_process_info;
1846         struct ll_rw_process_info *offset_info = sbi->ll_rw_offset_info;
1847         __s64 value;
1848
1849         if (len == 0)
1850                 return -EINVAL;
1851
1852         value = ll_stats_pid_write(buf, len);
1853
1854         if (value == 0)
1855                 sbi->ll_rw_stats_on = 0;
1856         else
1857                 sbi->ll_rw_stats_on = 1;
1858
1859         spin_lock(&sbi->ll_process_lock);
1860         sbi->ll_offset_process_count = 0;
1861         sbi->ll_rw_offset_entry_count = 0;
1862         memset(process_info, 0, sizeof(struct ll_rw_process_info) *
1863                LL_PROCESS_HIST_MAX);
1864         memset(offset_info, 0, sizeof(struct ll_rw_process_info) *
1865                LL_OFFSET_HIST_MAX);
1866         spin_unlock(&sbi->ll_process_lock);
1867
1868         return len;
1869 }
1870
1871 /**
1872  * ll_stats_pid_write() - Determine if stats collection should be enabled
1873  * @buf: Buffer containing the data written
1874  * @len: Number of bytes in the buffer
1875  *
1876  * Several proc files begin collecting stats when a value is written, and stop
1877  * collecting when either '0' or 'disable' is written. This function checks the
1878  * written value to see if collection should be enabled or disabled.
1879  *
1880  * Return: If '0' or 'disable' is provided, 0 is returned. If the text
1881  * equivalent of a number is written, that number is returned. Otherwise,
1882  * 1 is returned. Non-zero return values indicate collection should be enabled.
1883  */
1884 static __s64 ll_stats_pid_write(const char __user *buf, size_t len)
1885 {
1886         unsigned long long value = 1;
1887         int rc;
1888         char kernbuf[16];
1889
1890         rc = kstrtoull_from_user(buf, len, 0, &value);
1891         if (rc < 0 && len < sizeof(kernbuf)) {
1892
1893                 if (copy_from_user(kernbuf, buf, len))
1894                         return -EFAULT;
1895                 kernbuf[len] = 0;
1896
1897                 if (kernbuf[len - 1] == '\n')
1898                         kernbuf[len - 1] = 0;
1899
1900                 if (strncasecmp(kernbuf, "disable", 7) == 0)
1901                         value = 0;
1902         }
1903
1904         return value;
1905 }
1906
1907 LPROC_SEQ_FOPS(ll_rw_offset_stats);
1908 #endif /* CONFIG_PROC_FS */