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 int ll_fstype_seq_show(struct seq_file *m, void *v)
 246 {
 247         struct super_block *sb = m->private;
 248         struct ll_sb_info *sbi = ll_s2sbi(sb);
 249
 250         LASSERT(sb != NULL);
 251         seq_printf(m, "%s\n", sbi->ll_mnt.mnt->mnt_sb->s_type->name);
 252         return 0;
 253 }
 254 LPROC_SEQ_FOPS_RO(ll_fstype);
 255
 256 static int ll_sb_uuid_seq_show(struct seq_file *m, void *v)
 257 {
 258         struct super_block *sb = m->private;
 259
 260         LASSERT(sb != NULL);
 261         seq_printf(m, "%s\n", ll_s2sbi(sb)->ll_sb_uuid.uuid);
 262         return 0;
 263 }
 264 LPROC_SEQ_FOPS_RO(ll_sb_uuid);
 265
 266 static int ll_xattr_cache_seq_show(struct seq_file *m, void *v)
 267 {
 268         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 269
 270         seq_printf(m, "%u\n", sbi->ll_xattr_cache_enabled);
 271         return 0;
 272 }
 273
 274 static ssize_t ll_xattr_cache_seq_write(struct file *file,
 275                                         const char __user *buffer,
 276                                         size_t count, loff_t *off)
 277 {
 278         struct seq_file *m = file->private_data;
 279         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 280         bool val;
 281         int rc;
 282
 283         rc = kstrtobool_from_user(buffer, count, &val);
 284         if (rc)
 285                 return rc;
 286
 287         if (val && !(sbi->ll_flags & LL_SBI_XATTR_CACHE))
 288                 return -ENOTSUPP;
 289
 290         sbi->ll_xattr_cache_enabled = val;
 291         sbi->ll_xattr_cache_set = 1;
 292
 293         return count;
 294 }
 295 LPROC_SEQ_FOPS(ll_xattr_cache);
 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 LPROC_SEQ_FOPS_RO(ll_site_stats);
 308
 309 static int ll_max_readahead_mb_seq_show(struct seq_file *m, void *v)
 310 {
 311         struct super_block *sb = m->private;
 312         struct ll_sb_info *sbi = ll_s2sbi(sb);
 313         long pages_number;
 314         int mult;
 315
 316         spin_lock(&sbi->ll_lock);
 317         pages_number = sbi->ll_ra_info.ra_max_pages;
 318         spin_unlock(&sbi->ll_lock);
 319
 320         mult = 1 << (20 - PAGE_SHIFT);
 321         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 322 }
 323
 324 static ssize_t
 325 ll_max_readahead_mb_seq_write(struct file *file, const char __user *buffer,
 326                               size_t count, loff_t *off)
 327 {
 328         struct seq_file *m = file->private_data;
 329         struct super_block *sb = m->private;
 330         struct ll_sb_info *sbi = ll_s2sbi(sb);
 331         __s64 pages_number;
 332         int rc;
 333
 334         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 335         if (rc)
 336                 return rc;
 337
 338         pages_number >>= PAGE_SHIFT;
 339
 340         if (pages_number < 0 || pages_number > totalram_pages / 2) {
 341                 /* 1/2 of RAM */
 342                 CERROR("%s: can't set max_readahead_mb=%lu > %luMB\n",
 343                        ll_get_fsname(sb, NULL, 0),
 344                        (unsigned long)pages_number >> (20 - PAGE_SHIFT),
 345                        totalram_pages >> (20 - PAGE_SHIFT + 1));
 346                 return -ERANGE;
 347         }
 348
 349         spin_lock(&sbi->ll_lock);
 350         sbi->ll_ra_info.ra_max_pages = pages_number;
 351         spin_unlock(&sbi->ll_lock);
 352         return count;
 353 }
 354 LPROC_SEQ_FOPS(ll_max_readahead_mb);
 355
 356 static int ll_max_readahead_per_file_mb_seq_show(struct seq_file *m, void *v)
 357 {
 358         struct super_block *sb = m->private;
 359         struct ll_sb_info *sbi = ll_s2sbi(sb);
 360         long pages_number;
 361         int mult;
 362
 363         spin_lock(&sbi->ll_lock);
 364         pages_number = sbi->ll_ra_info.ra_max_pages_per_file;
 365         spin_unlock(&sbi->ll_lock);
 366
 367         mult = 1 << (20 - PAGE_SHIFT);
 368         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 369 }
 370
 371 static ssize_t
 372 ll_max_readahead_per_file_mb_seq_write(struct file *file,
 373                                        const char __user *buffer,
 374                                        size_t count, loff_t *off)
 375 {
 376         struct seq_file *m = file->private_data;
 377         struct super_block *sb = m->private;
 378         struct ll_sb_info *sbi = ll_s2sbi(sb);
 379         int rc;
 380         __s64 pages_number;
 381
 382         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 383         if (rc)
 384                 return rc;
 385
 386         pages_number >>= PAGE_SHIFT;
 387
 388         if (pages_number < 0 || pages_number > sbi->ll_ra_info.ra_max_pages) {
 389                 CERROR("%s: can't set max_readahead_per_file_mb=%lu > "
 390                        "max_read_ahead_mb=%lu\n", ll_get_fsname(sb, NULL, 0),
 391                        (unsigned long)pages_number >> (20 - PAGE_SHIFT),
 392                        sbi->ll_ra_info.ra_max_pages >> (20 - PAGE_SHIFT));
 393                 return -ERANGE;
 394         }
 395
 396         spin_lock(&sbi->ll_lock);
 397         sbi->ll_ra_info.ra_max_pages_per_file = pages_number;
 398         spin_unlock(&sbi->ll_lock);
 399         return count;
 400 }
 401 LPROC_SEQ_FOPS(ll_max_readahead_per_file_mb);
 402
 403 static int ll_max_read_ahead_whole_mb_seq_show(struct seq_file *m, void *v)
 404 {
 405         struct super_block *sb = m->private;
 406         struct ll_sb_info *sbi = ll_s2sbi(sb);
 407         long pages_number;
 408         int mult;
 409
 410         spin_lock(&sbi->ll_lock);
 411         pages_number = sbi->ll_ra_info.ra_max_read_ahead_whole_pages;
 412         spin_unlock(&sbi->ll_lock);
 413
 414         mult = 1 << (20 - PAGE_SHIFT);
 415         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 416 }
 417
 418 static ssize_t
 419 ll_max_read_ahead_whole_mb_seq_write(struct file *file,
 420                                      const char __user *buffer,
 421                                      size_t count, loff_t *off)
 422 {
 423         struct seq_file *m = file->private_data;
 424         struct super_block *sb = m->private;
 425         struct ll_sb_info *sbi = ll_s2sbi(sb);
 426         int rc;
 427         __s64 pages_number;
 428
 429         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 430         if (rc)
 431                 return rc;
 432
 433         pages_number >>= PAGE_SHIFT;
 434
 435         /* Cap this at the current max readahead window size, the readahead
 436          * algorithm does this anyway so it's pointless to set it larger. */
 437         if (pages_number < 0 ||
 438             pages_number > sbi->ll_ra_info.ra_max_pages_per_file) {
 439                 int pages_shift = 20 - PAGE_SHIFT;
 440                 CERROR("%s: can't set max_read_ahead_whole_mb=%lu > "
 441                        "max_read_ahead_per_file_mb=%lu\n",
 442                        ll_get_fsname(sb, NULL, 0),
 443                        (unsigned long)pages_number >> pages_shift,
 444                        sbi->ll_ra_info.ra_max_pages_per_file >> pages_shift);
 445                 return -ERANGE;
 446         }
 447
 448         spin_lock(&sbi->ll_lock);
 449         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = pages_number;
 450         spin_unlock(&sbi->ll_lock);
 451         return count;
 452 }
 453 LPROC_SEQ_FOPS(ll_max_read_ahead_whole_mb);
 454
 455 static int ll_max_cached_mb_seq_show(struct seq_file *m, void *v)
 456 {
 457         struct super_block     *sb    = m->private;
 458         struct ll_sb_info      *sbi   = ll_s2sbi(sb);
 459         struct cl_client_cache *cache = sbi->ll_cache;
 460         int shift = 20 - PAGE_SHIFT;
 461         long max_cached_mb;
 462         long unused_mb;
 463
 464         max_cached_mb = cache->ccc_lru_max >> shift;
 465         unused_mb = atomic_long_read(&cache->ccc_lru_left) >> shift;
 466         seq_printf(m, "users: %d\n"
 467                    "max_cached_mb: %ld\n"
 468                    "used_mb: %ld\n"
 469                    "unused_mb: %ld\n"
 470                    "reclaim_count: %u\n",
 471                    atomic_read(&cache->ccc_users),
 472                    max_cached_mb,
 473                    max_cached_mb - unused_mb,
 474                    unused_mb,
 475                    cache->ccc_lru_shrinkers);
 476         return 0;
 477 }
 478
 479 static ssize_t
 480 ll_max_cached_mb_seq_write(struct file *file, const char __user *buffer,
 481                            size_t count, loff_t *off)
 482 {
 483         struct seq_file *m = file->private_data;
 484         struct super_block *sb = m->private;
 485         struct ll_sb_info *sbi = ll_s2sbi(sb);
 486         struct cl_client_cache *cache = sbi->ll_cache;
 487         struct lu_env *env;
 488         long diff = 0;
 489         long nrpages = 0;
 490         __u16 refcheck;
 491         __s64 pages_number;
 492         long rc;
 493         char kernbuf[128];
 494         ENTRY;
 495
 496         if (count >= sizeof(kernbuf))
 497                 RETURN(-EINVAL);
 498
 499         if (copy_from_user(kernbuf, buffer, count))
 500                 RETURN(-EFAULT);
 501         kernbuf[count] = 0;
 502
 503         buffer += lprocfs_find_named_value(kernbuf, "max_cached_mb:", &count) -
 504                   kernbuf;
 505         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 506         if (rc)
 507                 RETURN(rc);
 508
 509         pages_number >>= PAGE_SHIFT;
 510
 511         if (pages_number < 0 || pages_number > totalram_pages) {
 512                 CERROR("%s: can't set max cache more than %lu MB\n",
 513                        ll_get_fsname(sb, NULL, 0),
 514                        totalram_pages >> (20 - PAGE_SHIFT));
 515                 RETURN(-ERANGE);
 516         }
 517         /* Allow enough cache so clients can make well-formed RPCs */
 518         pages_number = max_t(long, pages_number, PTLRPC_MAX_BRW_PAGES);
 519
 520         spin_lock(&sbi->ll_lock);
 521         diff = pages_number - cache->ccc_lru_max;
 522         spin_unlock(&sbi->ll_lock);
 523
 524         /* easy - add more LRU slots. */
 525         if (diff >= 0) {
 526                 atomic_long_add(diff, &cache->ccc_lru_left);
 527                 GOTO(out, rc = 0);
 528         }
 529
 530         env = cl_env_get(&refcheck);
 531         if (IS_ERR(env))
 532                 RETURN(rc);
 533
 534         diff = -diff;
 535         while (diff > 0) {
 536                 long tmp;
 537
 538                 /* reduce LRU budget from free slots. */
 539                 do {
 540                         long ov, nv;
 541
 542                         ov = atomic_long_read(&cache->ccc_lru_left);
 543                         if (ov == 0)
 544                                 break;
 545
 546                         nv = ov > diff ? ov - diff : 0;
 547                         rc = atomic_long_cmpxchg(&cache->ccc_lru_left, ov, nv);
 548                         if (likely(ov == rc)) {
 549                                 diff -= ov - nv;
 550                                 nrpages += ov - nv;
 551                                 break;
 552                         }
 553                 } while (1);
 554
 555                 if (diff <= 0)
 556                         break;
 557
 558                 if (sbi->ll_dt_exp == NULL) { /* being initialized */
 559                         rc = -ENODEV;
 560                         break;
 561                 }
 562
 563                 /* difficult - have to ask OSCs to drop LRU slots. */
 564                 tmp = diff << 1;
 565                 rc = obd_set_info_async(env, sbi->ll_dt_exp,
 566                                 sizeof(KEY_CACHE_LRU_SHRINK),
 567                                 KEY_CACHE_LRU_SHRINK,
 568                                 sizeof(tmp), &tmp, NULL);
 569                 if (rc < 0)
 570                         break;
 571         }
 572         cl_env_put(env, &refcheck);
 573
 574 out:
 575         if (rc >= 0) {
 576                 spin_lock(&sbi->ll_lock);
 577                 cache->ccc_lru_max = pages_number;
 578                 spin_unlock(&sbi->ll_lock);
 579                 rc = count;
 580         } else {
 581                 atomic_long_add(nrpages, &cache->ccc_lru_left);
 582         }
 583         return rc;
 584 }
 585 LPROC_SEQ_FOPS(ll_max_cached_mb);
 586
 587 static int ll_checksum_seq_show(struct seq_file *m, void *v)
 588 {
 589         struct super_block *sb = m->private;
 590         struct ll_sb_info *sbi = ll_s2sbi(sb);
 591
 592         seq_printf(m, "%u\n", (sbi->ll_flags & LL_SBI_CHECKSUM) ? 1 : 0);
 593         return 0;
 594 }
 595
 596 static ssize_t ll_checksum_seq_write(struct file *file,
 597                                      const char __user *buffer,
 598                                      size_t count, loff_t *off)
 599 {
 600         struct seq_file *m = file->private_data;
 601         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 602         bool val;
 603         int tmp;
 604         int rc;
 605
 606         if (!sbi->ll_dt_exp)
 607                 /* Not set up yet */
 608                 return -EAGAIN;
 609
 610         rc = kstrtobool_from_user(buffer, count, &val);
 611         if (rc)
 612                 return rc;
 613         if (val)
 614                 sbi->ll_flags |= LL_SBI_CHECKSUM;
 615         else
 616                 sbi->ll_flags &= ~LL_SBI_CHECKSUM;
 617         tmp = val;
 618
 619         rc = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 620                                 KEY_CHECKSUM, sizeof(tmp), &tmp, NULL);
 621         if (rc)
 622                 CWARN("Failed to set OSC checksum flags: %d\n", rc);
 623
 624         return count;
 625 }
 626 LPROC_SEQ_FOPS(ll_checksum);
 627
 628 static int ll_rd_track_id(struct seq_file *m, enum stats_track_type type)
 629 {
 630         struct super_block *sb = m->private;
 631
 632         if (ll_s2sbi(sb)->ll_stats_track_type == type) {
 633                 seq_printf(m, "%d\n",
 634                            ll_s2sbi(sb)->ll_stats_track_id);
 635         } else if (ll_s2sbi(sb)->ll_stats_track_type == STATS_TRACK_ALL) {
 636                 seq_puts(m, "0 (all)\n");
 637         } else {
 638                 seq_puts(m, "untracked\n");
 639         }
 640         return 0;
 641 }
 642
 643 static int ll_wr_track_id(const char __user *buffer, unsigned long count,
 644                           void *data, enum stats_track_type type)
 645 {
 646         struct super_block *sb = data;
 647         unsigned int pid;
 648         int rc;
 649
 650         rc = kstrtouint_from_user(buffer, count, 0, &pid);
 651         if (rc)
 652                 return rc;
 653
 654         ll_s2sbi(sb)->ll_stats_track_id = pid;
 655         if (pid == 0)
 656                 ll_s2sbi(sb)->ll_stats_track_type = STATS_TRACK_ALL;
 657         else
 658                 ll_s2sbi(sb)->ll_stats_track_type = type;
 659         lprocfs_clear_stats(ll_s2sbi(sb)->ll_stats);
 660         return count;
 661 }
 662
 663 static int ll_track_pid_seq_show(struct seq_file *m, void *v)
 664 {
 665         return ll_rd_track_id(m, STATS_TRACK_PID);
 666 }
 667
 668 static ssize_t ll_track_pid_seq_write(struct file *file,
 669                                       const char __user *buffer,
 670                                       size_t count, loff_t *off)
 671 {
 672         struct seq_file *seq = file->private_data;
 673         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PID);
 674 }
 675 LPROC_SEQ_FOPS(ll_track_pid);
 676
 677 static int ll_track_ppid_seq_show(struct seq_file *m, void *v)
 678 {
 679         return ll_rd_track_id(m, STATS_TRACK_PPID);
 680 }
 681
 682 static ssize_t ll_track_ppid_seq_write(struct file *file,
 683                                        const char __user *buffer,
 684                                        size_t count, loff_t *off)
 685 {
 686         struct seq_file *seq = file->private_data;
 687         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PPID);
 688 }
 689 LPROC_SEQ_FOPS(ll_track_ppid);
 690
 691 static int ll_track_gid_seq_show(struct seq_file *m, void *v)
 692 {
 693         return ll_rd_track_id(m, STATS_TRACK_GID);
 694 }
 695
 696 static ssize_t ll_track_gid_seq_write(struct file *file,
 697                                       const char __user *buffer,
 698                                       size_t count, loff_t *off)
 699 {
 700         struct seq_file *seq = file->private_data;
 701         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_GID);
 702 }
 703 LPROC_SEQ_FOPS(ll_track_gid);
 704
 705 static ssize_t statahead_running_max_show(struct kobject *kobj,
 706                                           struct attribute *attr,
 707                                           char *buf)
 708 {
 709         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 710                                               ll_kset.kobj);
 711
 712         return snprintf(buf, 16, "%u\n", sbi->ll_sa_running_max);
 713 }
 714
 715 static ssize_t statahead_running_max_store(struct kobject *kobj,
 716                                            struct attribute *attr,
 717                                            const char *buffer,
 718                                            size_t count)
 719 {
 720         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 721                                               ll_kset.kobj);
 722         unsigned long val;
 723         int rc;
 724
 725         rc = kstrtoul(buffer, 0, &val);
 726         if (rc)
 727                 return rc;
 728
 729         if (val <= LL_SA_RUNNING_MAX) {
 730                 sbi->ll_sa_running_max = val;
 731                 return count;
 732         }
 733
 734         CERROR("Bad statahead_running_max value %lu. Valid values "
 735                "are in the range [0, %d]\n", val, LL_SA_RUNNING_MAX);
 736
 737         return -ERANGE;
 738 }
 739 LUSTRE_RW_ATTR(statahead_running_max);
 740
 741 static int ll_statahead_max_seq_show(struct seq_file *m, void *v)
 742 {
 743         struct super_block *sb = m->private;
 744         struct ll_sb_info *sbi = ll_s2sbi(sb);
 745
 746         seq_printf(m, "%u\n", sbi->ll_sa_max);
 747         return 0;
 748 }
 749
 750 static ssize_t ll_statahead_max_seq_write(struct file *file,
 751                                           const char __user *buffer,
 752                                           size_t count, loff_t *off)
 753 {
 754         struct seq_file *m = file->private_data;
 755         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 756         unsigned int val;
 757         int rc;
 758
 759         rc = kstrtouint_from_user(buffer, count, 0, &val);
 760         if (rc)
 761                 return rc;
 762
 763         if (val <= LL_SA_RPC_MAX)
 764                 sbi->ll_sa_max = val;
 765         else
 766                 CERROR("Bad statahead_max value %u. Valid values are in "
 767                        "the range [0, %d]\n", val, LL_SA_RPC_MAX);
 768
 769         return count;
 770 }
 771 LPROC_SEQ_FOPS(ll_statahead_max);
 772
 773 static int ll_statahead_agl_seq_show(struct seq_file *m, void *v)
 774 {
 775         struct super_block *sb = m->private;
 776         struct ll_sb_info *sbi = ll_s2sbi(sb);
 777
 778         seq_printf(m, "%u\n",
 779                    sbi->ll_flags & LL_SBI_AGL_ENABLED ? 1 : 0);
 780         return 0;
 781 }
 782
 783 static ssize_t ll_statahead_agl_seq_write(struct file *file,
 784                                           const char __user *buffer,
 785                                           size_t count, loff_t *off)
 786 {
 787         struct seq_file *m = file->private_data;
 788         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 789         bool val;
 790         int rc;
 791
 792         rc = kstrtobool_from_user(buffer, count, &val);
 793         if (rc)
 794                 return rc;
 795
 796         if (val)
 797                 sbi->ll_flags |= LL_SBI_AGL_ENABLED;
 798         else
 799                 sbi->ll_flags &= ~LL_SBI_AGL_ENABLED;
 800
 801         return count;
 802 }
 803 LPROC_SEQ_FOPS(ll_statahead_agl);
 804
 805 static int ll_statahead_stats_seq_show(struct seq_file *m, void *v)
 806 {
 807         struct super_block *sb = m->private;
 808         struct ll_sb_info *sbi = ll_s2sbi(sb);
 809
 810         seq_printf(m, "statahead total: %u\n"
 811                     "statahead wrong: %u\n"
 812                     "agl total: %u\n",
 813                     atomic_read(&sbi->ll_sa_total),
 814                     atomic_read(&sbi->ll_sa_wrong),
 815                     atomic_read(&sbi->ll_agl_total));
 816         return 0;
 817 }
 818 LPROC_SEQ_FOPS_RO(ll_statahead_stats);
 819
 820 static int ll_lazystatfs_seq_show(struct seq_file *m, void *v)
 821 {
 822         struct super_block *sb = m->private;
 823         struct ll_sb_info *sbi = ll_s2sbi(sb);
 824
 825         seq_printf(m, "%u\n",
 826                    (sbi->ll_flags & LL_SBI_LAZYSTATFS) ? 1 : 0);
 827         return 0;
 828 }
 829
 830 static ssize_t ll_lazystatfs_seq_write(struct file *file,
 831                                        const char __user *buffer,
 832                                         size_t count, loff_t *off)
 833 {
 834         struct seq_file *m = file->private_data;
 835         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 836         bool val;
 837         int rc;
 838
 839         rc = kstrtobool_from_user(buffer, count, &val);
 840         if (rc)
 841                 return rc;
 842
 843         if (val)
 844                 sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 845         else
 846                 sbi->ll_flags &= ~LL_SBI_LAZYSTATFS;
 847
 848         return count;
 849 }
 850 LPROC_SEQ_FOPS(ll_lazystatfs);
 851
 852 static int ll_max_easize_seq_show(struct seq_file *m, void *v)
 853 {
 854         struct super_block *sb = m->private;
 855         struct ll_sb_info *sbi = ll_s2sbi(sb);
 856         unsigned int ealen;
 857         int rc;
 858
 859         rc = ll_get_max_mdsize(sbi, &ealen);
 860         if (rc)
 861                 return rc;
 862
 863         seq_printf(m, "%u\n", ealen);
 864         return 0;
 865 }
 866 LPROC_SEQ_FOPS_RO(ll_max_easize);
 867
 868 /**
 869  * Get default_easize.
 870  *
 871  * \see client_obd::cl_default_mds_easize
 872  *
 873  * \param[in] m         seq_file handle
 874  * \param[in] v         unused for single entry
 875  *
 876  * \retval 0            on success
 877  * \retval negative     negated errno on failure
 878  */
 879 static int ll_default_easize_seq_show(struct seq_file *m, void *v)
 880 {
 881         struct super_block *sb = m->private;
 882         struct ll_sb_info *sbi = ll_s2sbi(sb);
 883         unsigned int ealen;
 884         int rc;
 885
 886         rc = ll_get_default_mdsize(sbi, &ealen);
 887         if (rc)
 888                 return rc;
 889
 890         seq_printf(m, "%u\n", ealen);
 891         return 0;
 892 }
 893
 894 /**
 895  * Set default_easize.
 896  *
 897  * Range checking on the passed value is handled by
 898  * ll_set_default_mdsize().
 899  *
 900  * \see client_obd::cl_default_mds_easize
 901  *
 902  * \param[in] file      proc file
 903  * \param[in] buffer    string passed from user space
 904  * \param[in] count     \a buffer length
 905  * \param[in] off       unused for single entry
 906  *
 907  * \retval positive     \a count on success
 908  * \retval negative     negated errno on failure
 909  */
 910 static ssize_t ll_default_easize_seq_write(struct file *file,
 911                                            const char __user *buffer,
 912                                            size_t count, loff_t *unused)
 913 {
 914         struct seq_file *seq = file->private_data;
 915         struct super_block *sb = (struct super_block *)seq->private;
 916         struct ll_sb_info *sbi = ll_s2sbi(sb);
 917         unsigned int val;
 918         int rc;
 919
 920         if (count == 0)
 921                 return 0;
 922
 923         rc = kstrtouint_from_user(buffer, count, 0, &val);
 924         if (rc)
 925                 return rc;
 926
 927         rc = ll_set_default_mdsize(sbi, val);
 928         if (rc)
 929                 return rc;
 930
 931         return count;
 932 }
 933 LPROC_SEQ_FOPS(ll_default_easize);
 934
 935 static int ll_sbi_flags_seq_show(struct seq_file *m, void *v)
 936 {
 937         const char *str[] = LL_SBI_FLAGS;
 938         struct super_block *sb = m->private;
 939         int flags = ll_s2sbi(sb)->ll_flags;
 940         int i = 0;
 941
 942         while (flags != 0) {
 943                 if (ARRAY_SIZE(str) <= i) {
 944                         CERROR("%s: Revise array LL_SBI_FLAGS to match sbi "
 945                                 "flags please.\n", ll_get_fsname(sb, NULL, 0));
 946                         return -EINVAL;
 947                 }
 948
 949                 if (flags & 0x1)
 950                         seq_printf(m, "%s ", str[i]);
 951                 flags >>= 1;
 952                 ++i;
 953         }
 954         seq_printf(m, "\b\n");
 955         return 0;
 956 }
 957 LPROC_SEQ_FOPS_RO(ll_sbi_flags);
 958
 959 static int ll_tiny_write_seq_show(struct seq_file *m, void *v)
 960 {
 961         struct super_block *sb = m->private;
 962         struct ll_sb_info *sbi = ll_s2sbi(sb);
 963
 964         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_TINY_WRITE));
 965         return 0;
 966 }
 967
 968 static ssize_t ll_tiny_write_seq_write(
 969         struct file *file, const char __user *buffer, size_t count, loff_t *off)
 970 {
 971         struct seq_file *m = file->private_data;
 972         struct super_block *sb = m->private;
 973         struct ll_sb_info *sbi = ll_s2sbi(sb);
 974         bool val;
 975         int rc;
 976
 977         rc = kstrtobool_from_user(buffer, count, &val);
 978         if (rc)
 979                 return rc;
 980
 981         spin_lock(&sbi->ll_lock);
 982         if (val)
 983                 sbi->ll_flags |= LL_SBI_TINY_WRITE;
 984         else
 985                 sbi->ll_flags &= ~LL_SBI_TINY_WRITE;
 986         spin_unlock(&sbi->ll_lock);
 987
 988         return count;
 989 }
 990 LPROC_SEQ_FOPS(ll_tiny_write);
 991
 992 static int ll_fast_read_seq_show(struct seq_file *m, void *v)
 993 {
 994         struct super_block *sb = m->private;
 995         struct ll_sb_info *sbi = ll_s2sbi(sb);
 996
 997         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_FAST_READ));
 998         return 0;
 999 }
1000
1001 static ssize_t
1002 ll_fast_read_seq_write(struct file *file, const char __user *buffer,
1003                        size_t count, loff_t *off)
1004 {
1005         struct seq_file *m = file->private_data;
1006         struct super_block *sb = m->private;
1007         struct ll_sb_info *sbi = ll_s2sbi(sb);
1008         bool val;
1009         int rc;
1010
1011         rc = kstrtobool_from_user(buffer, count, &val);
1012         if (rc)
1013                 return rc;
1014
1015         spin_lock(&sbi->ll_lock);
1016         if (val)
1017                 sbi->ll_flags |= LL_SBI_FAST_READ;
1018         else
1019                 sbi->ll_flags &= ~LL_SBI_FAST_READ;
1020         spin_unlock(&sbi->ll_lock);
1021
1022         return count;
1023 }
1024 LPROC_SEQ_FOPS(ll_fast_read);
1025
1026 static int ll_pio_seq_show(struct seq_file *m, void *v)
1027 {
1028         struct super_block *sb = m->private;
1029         struct ll_sb_info *sbi = ll_s2sbi(sb);
1030
1031         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_PIO));
1032         return 0;
1033 }
1034
1035 static ssize_t ll_pio_seq_write(struct file *file, const char __user *buffer,
1036                                 size_t count, loff_t *off)
1037 {
1038         struct seq_file *m = file->private_data;
1039         struct super_block *sb = m->private;
1040         struct ll_sb_info *sbi = ll_s2sbi(sb);
1041         bool val;
1042         int rc;
1043
1044         rc = kstrtobool_from_user(buffer, count, &val);
1045         if (rc)
1046                 return rc;
1047
1048         spin_lock(&sbi->ll_lock);
1049         if (val)
1050                 sbi->ll_flags |= LL_SBI_PIO;
1051         else
1052                 sbi->ll_flags &= ~LL_SBI_PIO;
1053         spin_unlock(&sbi->ll_lock);
1054
1055         return count;
1056 }
1057 LPROC_SEQ_FOPS(ll_pio);
1058
1059 static int ll_unstable_stats_seq_show(struct seq_file *m, void *v)
1060 {
1061         struct super_block      *sb    = m->private;
1062         struct ll_sb_info       *sbi   = ll_s2sbi(sb);
1063         struct cl_client_cache  *cache = sbi->ll_cache;
1064         long pages;
1065         int mb;
1066
1067         pages = atomic_long_read(&cache->ccc_unstable_nr);
1068         mb    = (pages * PAGE_SIZE) >> 20;
1069
1070         seq_printf(m, "unstable_check:     %8d\n"
1071                    "unstable_pages: %12ld\n"
1072                    "unstable_mb:        %8d\n",
1073                    cache->ccc_unstable_check, pages, mb);
1074         return 0;
1075 }
1076
1077 static ssize_t ll_unstable_stats_seq_write(struct file *file,
1078                                            const char __user *buffer,
1079                                            size_t count, loff_t *unused)
1080 {
1081         struct seq_file *seq = file->private_data;
1082         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)seq->private);
1083         char kernbuf[128];
1084         bool val;
1085         int rc;
1086
1087         if (count == 0)
1088                 return 0;
1089         if (count >= sizeof(kernbuf))
1090                 return -EINVAL;
1091
1092         if (copy_from_user(kernbuf, buffer, count))
1093                 return -EFAULT;
1094         kernbuf[count] = 0;
1095
1096         buffer += lprocfs_find_named_value(kernbuf, "unstable_check:", &count) -
1097                   kernbuf;
1098         rc = kstrtobool_from_user(buffer, count, &val);
1099         if (rc < 0)
1100                 return rc;
1101
1102         /* borrow lru lock to set the value */
1103         spin_lock(&sbi->ll_cache->ccc_lru_lock);
1104         sbi->ll_cache->ccc_unstable_check = val;
1105         spin_unlock(&sbi->ll_cache->ccc_lru_lock);
1106
1107         return count;
1108 }
1109 LPROC_SEQ_FOPS(ll_unstable_stats);
1110
1111 static int ll_root_squash_seq_show(struct seq_file *m, void *v)
1112 {
1113         struct super_block *sb = m->private;
1114         struct ll_sb_info *sbi = ll_s2sbi(sb);
1115         struct root_squash_info *squash = &sbi->ll_squash;
1116
1117         seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
1118         return 0;
1119 }
1120
1121 static ssize_t ll_root_squash_seq_write(struct file *file,
1122                                         const char __user *buffer,
1123                                         size_t count, loff_t *off)
1124 {
1125         struct seq_file *m = file->private_data;
1126         struct super_block *sb = m->private;
1127         struct ll_sb_info *sbi = ll_s2sbi(sb);
1128         struct root_squash_info *squash = &sbi->ll_squash;
1129
1130         return lprocfs_wr_root_squash(buffer, count, squash,
1131                                       ll_get_fsname(sb, NULL, 0));
1132 }
1133 LPROC_SEQ_FOPS(ll_root_squash);
1134
1135 static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
1136 {
1137         struct super_block *sb = m->private;
1138         struct ll_sb_info *sbi = ll_s2sbi(sb);
1139         struct root_squash_info *squash = &sbi->ll_squash;
1140         int len;
1141
1142         down_read(&squash->rsi_sem);
1143         if (!list_empty(&squash->rsi_nosquash_nids)) {
1144                 len = cfs_print_nidlist(m->buf + m->count, m->size - m->count,
1145                                         &squash->rsi_nosquash_nids);
1146                 m->count += len;
1147                 seq_putc(m, '\n');
1148         } else {
1149                 seq_puts(m, "NONE\n");
1150         }
1151         up_read(&squash->rsi_sem);
1152
1153         return 0;
1154 }
1155
1156 static ssize_t ll_nosquash_nids_seq_write(struct file *file,
1157                                           const char __user *buffer,
1158                                           size_t count, loff_t *off)
1159 {
1160         struct seq_file *m = file->private_data;
1161         struct super_block *sb = m->private;
1162         struct ll_sb_info *sbi = ll_s2sbi(sb);
1163         struct root_squash_info *squash = &sbi->ll_squash;
1164         int rc;
1165
1166         rc = lprocfs_wr_nosquash_nids(buffer, count, squash,
1167                                       ll_get_fsname(sb, NULL, 0));
1168         if (rc < 0)
1169                 return rc;
1170
1171         ll_compute_rootsquash_state(sbi);
1172
1173         return rc;
1174 }
1175 LPROC_SEQ_FOPS(ll_nosquash_nids);
1176
1177 struct lprocfs_vars lprocfs_llite_obd_vars[] = {
1178         { .name =       "uuid",
1179           .fops =       &ll_sb_uuid_fops                        },
1180         { .name =       "fstype",
1181           .fops =       &ll_fstype_fops                         },
1182         { .name =       "site",
1183           .fops =       &ll_site_stats_fops                     },
1184         { .name =       "stat_blocksize",
1185           .fops =       &ll_stat_blksize_fops                   },
1186         { .name =       "max_read_ahead_mb",
1187           .fops =       &ll_max_readahead_mb_fops               },
1188         { .name =       "max_read_ahead_per_file_mb",
1189           .fops =       &ll_max_readahead_per_file_mb_fops      },
1190         { .name =       "max_read_ahead_whole_mb",
1191           .fops =       &ll_max_read_ahead_whole_mb_fops        },
1192         { .name =       "max_cached_mb",
1193           .fops =       &ll_max_cached_mb_fops                  },
1194         { .name =       "checksum_pages",
1195           .fops =       &ll_checksum_fops                       },
1196         { .name =       "stats_track_pid",
1197           .fops =       &ll_track_pid_fops                      },
1198         { .name =       "stats_track_ppid",
1199           .fops =       &ll_track_ppid_fops                     },
1200         { .name =       "stats_track_gid",
1201           .fops =       &ll_track_gid_fops                      },
1202         { .name =       "statahead_max",
1203           .fops =       &ll_statahead_max_fops                  },
1204         { .name =       "statahead_agl",
1205           .fops =       &ll_statahead_agl_fops                  },
1206         { .name =       "statahead_stats",
1207           .fops =       &ll_statahead_stats_fops                },
1208         { .name =       "lazystatfs",
1209           .fops =       &ll_lazystatfs_fops                     },
1210         { .name =       "max_easize",
1211           .fops =       &ll_max_easize_fops                     },
1212         { .name =       "default_easize",
1213           .fops =       &ll_default_easize_fops                 },
1214         { .name =       "sbi_flags",
1215           .fops =       &ll_sbi_flags_fops                      },
1216         { .name =       "xattr_cache",
1217           .fops =       &ll_xattr_cache_fops                    },
1218         { .name =       "unstable_stats",
1219           .fops =       &ll_unstable_stats_fops                 },
1220         { .name =       "root_squash",
1221           .fops =       &ll_root_squash_fops                    },
1222         { .name =       "nosquash_nids",
1223           .fops =       &ll_nosquash_nids_fops                  },
1224         { .name =       "fast_read",
1225           .fops =       &ll_fast_read_fops,                     },
1226         { .name =       "pio",
1227           .fops =       &ll_pio_fops,                           },
1228         { .name =       "tiny_write",
1229           .fops =       &ll_tiny_write_fops,                    },
1230         { NULL }
1231 };
1232
1233 #define MAX_STRING_SIZE 128
1234
1235 static struct attribute *llite_attrs[] = {
1236         &lustre_attr_blocksize.attr,
1237         &lustre_attr_kbytestotal.attr,
1238         &lustre_attr_kbytesfree.attr,
1239         &lustre_attr_kbytesavail.attr,
1240         &lustre_attr_filestotal.attr,
1241         &lustre_attr_filesfree.attr,
1242         &lustre_attr_client_type.attr,
1243         &lustre_attr_statahead_running_max.attr,
1244         NULL,
1245 };
1246
1247 static void llite_kobj_release(struct kobject *kobj)
1248 {
1249         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1250                                               ll_kset.kobj);
1251         complete(&sbi->ll_kobj_unregister);
1252 }
1253
1254 static struct kobj_type llite_ktype = {
1255         .default_attrs  = llite_attrs,
1256         .sysfs_ops      = &lustre_sysfs_ops,
1257         .release        = llite_kobj_release,
1258 };
1259
1260 static const struct llite_file_opcode {
1261         __u32       opcode;
1262         __u32       type;
1263         const char *opname;
1264 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
1265         /* file operation */
1266         { LPROC_LL_DIRTY_HITS,     LPROCFS_TYPE_REGS, "dirty_pages_hits" },
1267         { LPROC_LL_DIRTY_MISSES,   LPROCFS_TYPE_REGS, "dirty_pages_misses" },
1268         { LPROC_LL_READ_BYTES,     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1269                                    "read_bytes" },
1270         { LPROC_LL_WRITE_BYTES,    LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1271                                    "write_bytes" },
1272         { LPROC_LL_BRW_READ,       LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1273                                    "brw_read" },
1274         { LPROC_LL_BRW_WRITE,      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1275                                    "brw_write" },
1276         { LPROC_LL_IOCTL,          LPROCFS_TYPE_REGS, "ioctl" },
1277         { LPROC_LL_OPEN,           LPROCFS_TYPE_REGS, "open" },
1278         { LPROC_LL_RELEASE,        LPROCFS_TYPE_REGS, "close" },
1279         { LPROC_LL_MAP,            LPROCFS_TYPE_REGS, "mmap" },
1280         { LPROC_LL_FAULT,          LPROCFS_TYPE_REGS, "page_fault" },
1281         { LPROC_LL_MKWRITE,        LPROCFS_TYPE_REGS, "page_mkwrite" },
1282         { LPROC_LL_LLSEEK,         LPROCFS_TYPE_REGS, "seek" },
1283         { LPROC_LL_FSYNC,          LPROCFS_TYPE_REGS, "fsync" },
1284         { LPROC_LL_READDIR,        LPROCFS_TYPE_REGS, "readdir" },
1285         /* inode operation */
1286         { LPROC_LL_SETATTR,        LPROCFS_TYPE_REGS, "setattr" },
1287         { LPROC_LL_TRUNC,          LPROCFS_TYPE_REGS, "truncate" },
1288         { LPROC_LL_FLOCK,          LPROCFS_TYPE_REGS, "flock" },
1289         { LPROC_LL_GETATTR,        LPROCFS_TYPE_REGS, "getattr" },
1290         /* dir inode operation */
1291         { LPROC_LL_CREATE,         LPROCFS_TYPE_REGS, "create" },
1292         { LPROC_LL_LINK,           LPROCFS_TYPE_REGS, "link" },
1293         { LPROC_LL_UNLINK,         LPROCFS_TYPE_REGS, "unlink" },
1294         { LPROC_LL_SYMLINK,        LPROCFS_TYPE_REGS, "symlink" },
1295         { LPROC_LL_MKDIR,          LPROCFS_TYPE_REGS, "mkdir" },
1296         { LPROC_LL_RMDIR,          LPROCFS_TYPE_REGS, "rmdir" },
1297         { LPROC_LL_MKNOD,          LPROCFS_TYPE_REGS, "mknod" },
1298         { LPROC_LL_RENAME,         LPROCFS_TYPE_REGS, "rename" },
1299         /* special inode operation */
1300         { LPROC_LL_STAFS,          LPROCFS_TYPE_REGS, "statfs" },
1301         { LPROC_LL_ALLOC_INODE,    LPROCFS_TYPE_REGS, "alloc_inode" },
1302         { LPROC_LL_SETXATTR,       LPROCFS_TYPE_REGS, "setxattr" },
1303         { LPROC_LL_GETXATTR,       LPROCFS_TYPE_REGS, "getxattr" },
1304         { LPROC_LL_GETXATTR_HITS,  LPROCFS_TYPE_REGS, "getxattr_hits" },
1305         { LPROC_LL_LISTXATTR,      LPROCFS_TYPE_REGS, "listxattr" },
1306         { LPROC_LL_REMOVEXATTR,    LPROCFS_TYPE_REGS, "removexattr" },
1307         { LPROC_LL_INODE_PERM,     LPROCFS_TYPE_REGS, "inode_permission" },
1308 };
1309
1310 void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
1311 {
1312         if (!sbi->ll_stats)
1313                 return;
1314         if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
1315                 lprocfs_counter_add(sbi->ll_stats, op, count);
1316         else if (sbi->ll_stats_track_type == STATS_TRACK_PID &&
1317                  sbi->ll_stats_track_id == current->pid)
1318                 lprocfs_counter_add(sbi->ll_stats, op, count);
1319         else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
1320                  sbi->ll_stats_track_id == current->parent->pid)
1321                 lprocfs_counter_add(sbi->ll_stats, op, count);
1322         else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
1323                  sbi->ll_stats_track_id ==
1324                         from_kgid(&init_user_ns, current_gid()))
1325                 lprocfs_counter_add(sbi->ll_stats, op, count);
1326 }
1327 EXPORT_SYMBOL(ll_stats_ops_tally);
1328
1329 static const char *ra_stat_string[] = {
1330         [RA_STAT_HIT] = "hits",
1331         [RA_STAT_MISS] = "misses",
1332         [RA_STAT_DISTANT_READPAGE] = "readpage not consecutive",
1333         [RA_STAT_MISS_IN_WINDOW] = "miss inside window",
1334         [RA_STAT_FAILED_GRAB_PAGE] = "failed grab_cache_page",
1335         [RA_STAT_FAILED_MATCH] = "failed lock match",
1336         [RA_STAT_DISCARDED] = "read but discarded",
1337         [RA_STAT_ZERO_LEN] = "zero length file",
1338         [RA_STAT_ZERO_WINDOW] = "zero size window",
1339         [RA_STAT_EOF] = "read-ahead to EOF",
1340         [RA_STAT_MAX_IN_FLIGHT] = "hit max r-a issue",
1341         [RA_STAT_WRONG_GRAB_PAGE] = "wrong page from grab_cache_page",
1342         [RA_STAT_FAILED_REACH_END] = "failed to reach end"
1343 };
1344
1345 LPROC_SEQ_FOPS_RO_TYPE(llite, name);
1346 LPROC_SEQ_FOPS_RO_TYPE(llite, uuid);
1347
1348 int ll_debugfs_register_super(struct super_block *sb, const char *name)
1349 {
1350         struct lustre_sb_info *lsi = s2lsi(sb);
1351         struct ll_sb_info *sbi = ll_s2sbi(sb);
1352         struct lprocfs_vars lvars[2];
1353         int err, id, rc;
1354
1355         ENTRY;
1356         memset(lvars, 0, sizeof(lvars));
1357         lvars[0].name = name;
1358
1359         LASSERT(sbi != NULL);
1360
1361         sbi->ll_proc_root = lprocfs_register(name, proc_lustre_fs_root,
1362                                              NULL, NULL);
1363         if (IS_ERR(sbi->ll_proc_root)) {
1364                 err = PTR_ERR(sbi->ll_proc_root);
1365                 sbi->ll_proc_root = NULL;
1366                 RETURN(err);
1367         }
1368
1369         rc = lprocfs_seq_create(sbi->ll_proc_root, "dump_page_cache", 0444,
1370                                 &vvp_dump_pgcache_file_ops, sbi);
1371         if (rc)
1372                 CWARN("Error adding the dump_page_cache file\n");
1373
1374         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats", 0644,
1375                                 &ll_rw_extents_stats_fops, sbi);
1376         if (rc)
1377                 CWARN("Error adding the extent_stats file\n");
1378
1379         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats_per_process",
1380                                 0644, &ll_rw_extents_stats_pp_fops, sbi);
1381         if (rc)
1382                 CWARN("Error adding the extents_stats_per_process file\n");
1383
1384         rc = lprocfs_seq_create(sbi->ll_proc_root, "offset_stats", 0644,
1385                                 &ll_rw_offset_stats_fops, sbi);
1386         if (rc)
1387                 CWARN("Error adding the offset_stats file\n");
1388
1389         /* File operations stats */
1390         sbi->ll_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES,
1391                                             LPROCFS_STATS_FLAG_NONE);
1392         if (sbi->ll_stats == NULL)
1393                 GOTO(out_proc, err = -ENOMEM);
1394
1395         /* do counter init */
1396         for (id = 0; id < LPROC_LL_FILE_OPCODES; id++) {
1397                 __u32 type = llite_opcode_table[id].type;
1398                 void *ptr = NULL;
1399                 if (type & LPROCFS_TYPE_REGS)
1400                         ptr = "regs";
1401                 else if (type & LPROCFS_TYPE_BYTES)
1402                         ptr = "bytes";
1403                 else if (type & LPROCFS_TYPE_PAGES)
1404                         ptr = "pages";
1405                 lprocfs_counter_init(sbi->ll_stats,
1406                                      llite_opcode_table[id].opcode,
1407                                      (type & LPROCFS_CNTR_AVGMINMAX),
1408                                      llite_opcode_table[id].opname, ptr);
1409         }
1410
1411         err = lprocfs_register_stats(sbi->ll_proc_root, "stats", sbi->ll_stats);
1412         if (err)
1413                 GOTO(out_stats, err);
1414
1415         sbi->ll_ra_stats = lprocfs_alloc_stats(ARRAY_SIZE(ra_stat_string),
1416                                                LPROCFS_STATS_FLAG_NONE);
1417         if (sbi->ll_ra_stats == NULL)
1418                 GOTO(out_stats, err = -ENOMEM);
1419
1420         for (id = 0; id < ARRAY_SIZE(ra_stat_string); id++)
1421                 lprocfs_counter_init(sbi->ll_ra_stats, id, 0,
1422                                      ra_stat_string[id], "pages");
1423         err = lprocfs_register_stats(sbi->ll_proc_root, "read_ahead_stats",
1424                                      sbi->ll_ra_stats);
1425         if (err)
1426                 GOTO(out_ra_stats, err);
1427
1428         err = lprocfs_add_vars(sbi->ll_proc_root, lprocfs_llite_obd_vars, sb);
1429         if (err)
1430                 GOTO(out_ra_stats, err);
1431
1432         /* Yes we also register sysfs mount kset here as well */
1433         sbi->ll_kset.kobj.parent = llite_kobj;
1434         sbi->ll_kset.kobj.ktype = &llite_ktype;
1435         init_completion(&sbi->ll_kobj_unregister);
1436         err = kobject_set_name(&sbi->ll_kset.kobj, "%s", name);
1437         if (err)
1438                 GOTO(out_ra_stats, err);
1439
1440         err = kset_register(&sbi->ll_kset);
1441         if (err)
1442                 GOTO(out_ra_stats, err);
1443
1444         lsi->lsi_kobj = kobject_get(&sbi->ll_kset.kobj);
1445
1446         RETURN(0);
1447 out_ra_stats:
1448         lprocfs_free_stats(&sbi->ll_ra_stats);
1449 out_stats:
1450         lprocfs_free_stats(&sbi->ll_stats);
1451 out_proc:
1452         lprocfs_remove(&sbi->ll_proc_root);
1453
1454         RETURN(err);
1455 }
1456
1457 int lprocfs_ll_register_obd(struct super_block *sb, const char *obdname)
1458 {
1459         struct lprocfs_vars lvars[2];
1460         struct ll_sb_info *sbi = ll_s2sbi(sb);
1461         struct obd_device *obd;
1462         struct proc_dir_entry *dir;
1463         char name[MAX_STRING_SIZE + 1];
1464         int err;
1465         ENTRY;
1466
1467         memset(lvars, 0, sizeof(lvars));
1468
1469         name[MAX_STRING_SIZE] = '\0';
1470         lvars[0].name = name;
1471
1472         LASSERT(sbi != NULL);
1473         LASSERT(obdname != NULL);
1474
1475         obd = class_name2obd(obdname);
1476
1477         LASSERT(obd != NULL);
1478         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1479         LASSERT(obd->obd_type->typ_name != NULL);
1480
1481         dir = proc_mkdir(obd->obd_type->typ_name, sbi->ll_proc_root);
1482         if (dir == NULL)
1483                 GOTO(out, err = -ENOMEM);
1484
1485         snprintf(name, MAX_STRING_SIZE, "common_name");
1486         lvars[0].fops = &llite_name_fops;
1487         err = lprocfs_add_vars(dir, lvars, obd);
1488         if (err)
1489                 GOTO(out, err);
1490
1491         snprintf(name, MAX_STRING_SIZE, "uuid");
1492         lvars[0].fops = &llite_uuid_fops;
1493         err = lprocfs_add_vars(dir, lvars, obd);
1494         if (err)
1495                 GOTO(out, err);
1496
1497 out:
1498         if (err) {
1499                 lprocfs_remove(&sbi->ll_proc_root);
1500                 lprocfs_free_stats(&sbi->ll_ra_stats);
1501                 lprocfs_free_stats(&sbi->ll_stats);
1502         }
1503         RETURN(err);
1504 }
1505
1506 void ll_debugfs_unregister_super(struct super_block *sb)
1507 {
1508         struct lustre_sb_info *lsi = s2lsi(sb);
1509         struct ll_sb_info *sbi = ll_s2sbi(sb);
1510
1511         kobject_put(lsi->lsi_kobj);
1512
1513         kset_unregister(&sbi->ll_kset);
1514         wait_for_completion(&sbi->ll_kobj_unregister);
1515
1516         if (sbi->ll_proc_root) {
1517                 lprocfs_remove(&sbi->ll_proc_root);
1518                 lprocfs_free_stats(&sbi->ll_ra_stats);
1519                 lprocfs_free_stats(&sbi->ll_stats);
1520         }
1521 }
1522 #undef MAX_STRING_SIZE
1523
1524 #define pct(a,b) (b ? a * 100 / b : 0)
1525
1526 static void ll_display_extents_info(struct ll_rw_extents_info *io_extents,
1527                                    struct seq_file *seq, int which)
1528 {
1529         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
1530         unsigned long start, end, r, w;
1531         char *unitp = "KMGTPEZY";
1532         int i, units = 10;
1533         struct per_process_info *pp_info = &io_extents->pp_extents[which];
1534
1535         read_cum = 0;
1536         write_cum = 0;
1537         start = 0;
1538
1539         for(i = 0; i < LL_HIST_MAX; i++) {
1540                 read_tot += pp_info->pp_r_hist.oh_buckets[i];
1541                 write_tot += pp_info->pp_w_hist.oh_buckets[i];
1542         }
1543
1544         for(i = 0; i < LL_HIST_MAX; i++) {
1545                 r = pp_info->pp_r_hist.oh_buckets[i];
1546                 w = pp_info->pp_w_hist.oh_buckets[i];
1547                 read_cum += r;
1548                 write_cum += w;
1549                 end = 1 << (i + LL_HIST_START - units);
1550                 seq_printf(seq, "%4lu%c - %4lu%c%c: %14lu %4lu %4lu  | "
1551                            "%14lu %4lu %4lu\n", start, *unitp, end, *unitp,
1552                            (i == LL_HIST_MAX - 1) ? '+' : ' ',
1553                            r, pct(r, read_tot), pct(read_cum, read_tot),
1554                            w, pct(w, write_tot), pct(write_cum, write_tot));
1555                 start = end;
1556                 if (start == 1<<10) {
1557                         start = 1;
1558                         units += 10;
1559                         unitp++;
1560                 }
1561                 if (read_cum == read_tot && write_cum == write_tot)
1562                         break;
1563         }
1564 }
1565
1566 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
1567 {
1568         struct timespec64 now;
1569         struct ll_sb_info *sbi = seq->private;
1570         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1571         int k;
1572
1573         ktime_get_real_ts64(&now);
1574
1575         if (!sbi->ll_rw_stats_on) {
1576                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1577                 return 0;
1578         }
1579         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1580                    (s64)now.tv_sec, now.tv_nsec);
1581         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1582         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1583                    "extents", "calls", "%", "cum%",
1584                    "calls", "%", "cum%");
1585         spin_lock(&sbi->ll_pp_extent_lock);
1586         for (k = 0; k < LL_PROCESS_HIST_MAX; k++) {
1587                 if (io_extents->pp_extents[k].pid != 0) {
1588                         seq_printf(seq, "\nPID: %d\n",
1589                                    io_extents->pp_extents[k].pid);
1590                         ll_display_extents_info(io_extents, seq, k);
1591                 }
1592         }
1593         spin_unlock(&sbi->ll_pp_extent_lock);
1594         return 0;
1595 }
1596
1597 static ssize_t ll_rw_extents_stats_pp_seq_write(struct file *file,
1598                                                 const char __user *buf,
1599                                                 size_t len,
1600                                                 loff_t *off)
1601 {
1602         struct seq_file *seq = file->private_data;
1603         struct ll_sb_info *sbi = seq->private;
1604         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1605         int i;
1606         __s64 value;
1607
1608         if (len == 0)
1609                 return -EINVAL;
1610
1611         value = ll_stats_pid_write(buf, len);
1612
1613         if (value == 0)
1614                 sbi->ll_rw_stats_on = 0;
1615         else
1616                 sbi->ll_rw_stats_on = 1;
1617
1618         spin_lock(&sbi->ll_pp_extent_lock);
1619         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1620                 io_extents->pp_extents[i].pid = 0;
1621                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1622                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1623         }
1624         spin_unlock(&sbi->ll_pp_extent_lock);
1625         return len;
1626 }
1627
1628 LPROC_SEQ_FOPS(ll_rw_extents_stats_pp);
1629
1630 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
1631 {
1632         struct timespec64 now;
1633         struct ll_sb_info *sbi = seq->private;
1634         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1635
1636         ktime_get_real_ts64(&now);
1637
1638         if (!sbi->ll_rw_stats_on) {
1639                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1640                 return 0;
1641         }
1642         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1643                    (s64)now.tv_sec, now.tv_nsec);
1644
1645         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1646         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1647                    "extents", "calls", "%", "cum%",
1648                    "calls", "%", "cum%");
1649         spin_lock(&sbi->ll_lock);
1650         ll_display_extents_info(io_extents, seq, LL_PROCESS_HIST_MAX);
1651         spin_unlock(&sbi->ll_lock);
1652
1653         return 0;
1654 }
1655
1656 static ssize_t ll_rw_extents_stats_seq_write(struct file *file,
1657                                              const char __user *buf,
1658                                              size_t len, loff_t *off)
1659 {
1660         struct seq_file *seq = file->private_data;
1661         struct ll_sb_info *sbi = seq->private;
1662         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1663         int i;
1664         __s64 value;
1665
1666         if (len == 0)
1667                 return -EINVAL;
1668
1669         value = ll_stats_pid_write(buf, len);
1670
1671         if (value == 0)
1672                 sbi->ll_rw_stats_on = 0;
1673         else
1674                 sbi->ll_rw_stats_on = 1;
1675
1676         spin_lock(&sbi->ll_pp_extent_lock);
1677         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
1678                 io_extents->pp_extents[i].pid = 0;
1679                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1680                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1681         }
1682         spin_unlock(&sbi->ll_pp_extent_lock);
1683
1684         return len;
1685 }
1686 LPROC_SEQ_FOPS(ll_rw_extents_stats);
1687
1688 void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
1689                        struct ll_file_data *file, loff_t pos,
1690                        size_t count, int rw)
1691 {
1692         int i, cur = -1;
1693         struct ll_rw_process_info *process;
1694         struct ll_rw_process_info *offset;
1695         int *off_count = &sbi->ll_rw_offset_entry_count;
1696         int *process_count = &sbi->ll_offset_process_count;
1697         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1698
1699         if(!sbi->ll_rw_stats_on)
1700                 return;
1701         process = sbi->ll_rw_process_info;
1702         offset = sbi->ll_rw_offset_info;
1703
1704         spin_lock(&sbi->ll_pp_extent_lock);
1705         /* Extent statistics */
1706         for(i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1707                 if(io_extents->pp_extents[i].pid == pid) {
1708                         cur = i;
1709                         break;
1710                 }
1711         }
1712
1713         if (cur == -1) {
1714                 /* new process */
1715                 sbi->ll_extent_process_count =
1716                         (sbi->ll_extent_process_count + 1) % LL_PROCESS_HIST_MAX;
1717                 cur = sbi->ll_extent_process_count;
1718                 io_extents->pp_extents[cur].pid = pid;
1719                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_r_hist);
1720                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_w_hist);
1721         }
1722
1723         for(i = 0; (count >= (1 << LL_HIST_START << i)) &&
1724              (i < (LL_HIST_MAX - 1)); i++);
1725         if (rw == 0) {
1726                 io_extents->pp_extents[cur].pp_r_hist.oh_buckets[i]++;
1727                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_r_hist.oh_buckets[i]++;
1728         } else {
1729                 io_extents->pp_extents[cur].pp_w_hist.oh_buckets[i]++;
1730                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_w_hist.oh_buckets[i]++;
1731         }
1732         spin_unlock(&sbi->ll_pp_extent_lock);
1733
1734         spin_lock(&sbi->ll_process_lock);
1735         /* Offset statistics */
1736         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1737                 if (process[i].rw_pid == pid) {
1738                         if (process[i].rw_last_file != file) {
1739                                 process[i].rw_range_start = pos;
1740                                 process[i].rw_last_file_pos = pos + count;
1741                                 process[i].rw_smallest_extent = count;
1742                                 process[i].rw_largest_extent = count;
1743                                 process[i].rw_offset = 0;
1744                                 process[i].rw_last_file = file;
1745                                 spin_unlock(&sbi->ll_process_lock);
1746                                 return;
1747                         }
1748                         if (process[i].rw_last_file_pos != pos) {
1749                                 *off_count =
1750                                     (*off_count + 1) % LL_OFFSET_HIST_MAX;
1751                                 offset[*off_count].rw_op = process[i].rw_op;
1752                                 offset[*off_count].rw_pid = pid;
1753                                 offset[*off_count].rw_range_start =
1754                                         process[i].rw_range_start;
1755                                 offset[*off_count].rw_range_end =
1756                                         process[i].rw_last_file_pos;
1757                                 offset[*off_count].rw_smallest_extent =
1758                                         process[i].rw_smallest_extent;
1759                                 offset[*off_count].rw_largest_extent =
1760                                         process[i].rw_largest_extent;
1761                                 offset[*off_count].rw_offset =
1762                                         process[i].rw_offset;
1763                                 process[i].rw_op = rw;
1764                                 process[i].rw_range_start = pos;
1765                                 process[i].rw_smallest_extent = count;
1766                                 process[i].rw_largest_extent = count;
1767                                 process[i].rw_offset = pos -
1768                                         process[i].rw_last_file_pos;
1769                         }
1770                         if(process[i].rw_smallest_extent > count)
1771                                 process[i].rw_smallest_extent = count;
1772                         if(process[i].rw_largest_extent < count)
1773                                 process[i].rw_largest_extent = count;
1774                         process[i].rw_last_file_pos = pos + count;
1775                         spin_unlock(&sbi->ll_process_lock);
1776                         return;
1777                 }
1778         }
1779         *process_count = (*process_count + 1) % LL_PROCESS_HIST_MAX;
1780         process[*process_count].rw_pid = pid;
1781         process[*process_count].rw_op = rw;
1782         process[*process_count].rw_range_start = pos;
1783         process[*process_count].rw_last_file_pos = pos + count;
1784         process[*process_count].rw_smallest_extent = count;
1785         process[*process_count].rw_largest_extent = count;
1786         process[*process_count].rw_offset = 0;
1787         process[*process_count].rw_last_file = file;
1788         spin_unlock(&sbi->ll_process_lock);
1789 }
1790
1791 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
1792 {
1793         struct timespec64 now;
1794         struct ll_sb_info *sbi = seq->private;
1795         struct ll_rw_process_info *offset = sbi->ll_rw_offset_info;
1796         struct ll_rw_process_info *process = sbi->ll_rw_process_info;
1797         int i;
1798
1799         ktime_get_real_ts64(&now);
1800
1801         if (!sbi->ll_rw_stats_on) {
1802                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1803                 return 0;
1804         }
1805         spin_lock(&sbi->ll_process_lock);
1806
1807         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1808                    (s64)now.tv_sec, now.tv_nsec);
1809         seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
1810                    "R/W", "PID", "RANGE START", "RANGE END",
1811                    "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");
1812
1813         /* We stored the discontiguous offsets here; print them first */
1814         for (i = 0; i < LL_OFFSET_HIST_MAX; i++) {
1815                 if (offset[i].rw_pid != 0)
1816                         seq_printf(seq,
1817                                   "%3c %10d %14llu %14llu %17lu %17lu %14llu\n",
1818                                    offset[i].rw_op == READ ? 'R' : 'W',
1819                                    offset[i].rw_pid,
1820                                    offset[i].rw_range_start,
1821                                    offset[i].rw_range_end,
1822                                    (unsigned long)offset[i].rw_smallest_extent,
1823                                    (unsigned long)offset[i].rw_largest_extent,
1824                                    offset[i].rw_offset);
1825         }
1826
1827         /* Then print the current offsets for each process */
1828         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1829                 if (process[i].rw_pid != 0)
1830                         seq_printf(seq,
1831                                   "%3c %10d %14llu %14llu %17lu %17lu %14llu\n",
1832                                    process[i].rw_op == READ ? 'R' : 'W',
1833                                    process[i].rw_pid,
1834                                    process[i].rw_range_start,
1835                                    process[i].rw_last_file_pos,
1836                                    (unsigned long)process[i].rw_smallest_extent,
1837                                    (unsigned long)process[i].rw_largest_extent,
1838                                    process[i].rw_offset);
1839         }
1840         spin_unlock(&sbi->ll_process_lock);
1841
1842         return 0;
1843 }
1844
1845 static ssize_t ll_rw_offset_stats_seq_write(struct file *file,
1846                                             const char __user *buf,
1847                                             size_t len, loff_t *off)
1848 {
1849         struct seq_file *seq = file->private_data;
1850         struct ll_sb_info *sbi = seq->private;
1851         struct ll_rw_process_info *process_info = sbi->ll_rw_process_info;
1852         struct ll_rw_process_info *offset_info = sbi->ll_rw_offset_info;
1853         __s64 value;
1854
1855         if (len == 0)
1856                 return -EINVAL;
1857
1858         value = ll_stats_pid_write(buf, len);
1859
1860         if (value == 0)
1861                 sbi->ll_rw_stats_on = 0;
1862         else
1863                 sbi->ll_rw_stats_on = 1;
1864
1865         spin_lock(&sbi->ll_process_lock);
1866         sbi->ll_offset_process_count = 0;
1867         sbi->ll_rw_offset_entry_count = 0;
1868         memset(process_info, 0, sizeof(struct ll_rw_process_info) *
1869                LL_PROCESS_HIST_MAX);
1870         memset(offset_info, 0, sizeof(struct ll_rw_process_info) *
1871                LL_OFFSET_HIST_MAX);
1872         spin_unlock(&sbi->ll_process_lock);
1873
1874         return len;
1875 }
1876
1877 /**
1878  * ll_stats_pid_write() - Determine if stats collection should be enabled
1879  * @buf: Buffer containing the data written
1880  * @len: Number of bytes in the buffer
1881  *
1882  * Several proc files begin collecting stats when a value is written, and stop
1883  * collecting when either '0' or 'disable' is written. This function checks the
1884  * written value to see if collection should be enabled or disabled.
1885  *
1886  * Return: If '0' or 'disable' is provided, 0 is returned. If the text
1887  * equivalent of a number is written, that number is returned. Otherwise,
1888  * 1 is returned. Non-zero return values indicate collection should be enabled.
1889  */
1890 static __s64 ll_stats_pid_write(const char __user *buf, size_t len)
1891 {
1892         unsigned long long value = 1;
1893         int rc;
1894         char kernbuf[16];
1895
1896         rc = kstrtoull_from_user(buf, len, 0, &value);
1897         if (rc < 0 && len < sizeof(kernbuf)) {
1898
1899                 if (copy_from_user(kernbuf, buf, len))
1900                         return -EFAULT;
1901                 kernbuf[len] = 0;
1902
1903                 if (kernbuf[len - 1] == '\n')
1904                         kernbuf[len - 1] = 0;
1905
1906                 if (strncasecmp(kernbuf, "disable", 7) == 0)
1907                         value = 0;
1908         }
1909
1910         return value;
1911 }
1912
1913 LPROC_SEQ_FOPS(ll_rw_offset_stats);
1914 #endif /* CONFIG_PROC_FS */