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
  48 #ifdef CONFIG_PROC_FS
  49 /* /proc/lustre/llite mount point registration */
  50 static const struct file_operations ll_rw_extents_stats_fops;
  51 static const struct file_operations ll_rw_extents_stats_pp_fops;
  52 static const struct file_operations ll_rw_offset_stats_fops;
  53 static __s64 ll_stats_pid_write(const char __user *buf, size_t len);
  54
  55 static int ll_blksize_seq_show(struct seq_file *m, void *v)
  56 {
  57         struct super_block *sb = m->private;
  58         struct obd_statfs osfs;
  59         int rc;
  60
  61         LASSERT(sb != NULL);
  62         rc = ll_statfs_internal(sb, &osfs,
  63                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
  64                                 OBD_STATFS_NODELAY);
  65         if (!rc)
  66                 seq_printf(m, "%u\n", osfs.os_bsize);
  67         return rc;
  68 }
  69 LPROC_SEQ_FOPS_RO(ll_blksize);
  70
  71 static int ll_stat_blksize_seq_show(struct seq_file *m, void *v)
  72 {
  73         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
  74
  75         seq_printf(m, "%u\n", sbi->ll_stat_blksize);
  76
  77         return 0;
  78 }
  79
  80 static ssize_t ll_stat_blksize_seq_write(struct file *file,
  81                                          const char __user *buffer,
  82                                          size_t count, loff_t *off)
  83 {
  84         struct seq_file *m = file->private_data;
  85         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
  86         __s64 val;
  87         int rc;
  88
  89         rc = lprocfs_str_to_s64(buffer, count, &val);
  90         if (rc)
  91                 return rc;
  92
  93         if (val != 0 && (val < PAGE_SIZE || (val & (val - 1))) != 0)
  94                 return -ERANGE;
  95
  96         sbi->ll_stat_blksize = val;
  97
  98         return count;
  99 }
 100 LPROC_SEQ_FOPS(ll_stat_blksize);
 101
 102 static int ll_kbytestotal_seq_show(struct seq_file *m, void *v)
 103 {
 104         struct super_block *sb = m->private;
 105         struct obd_statfs osfs;
 106         int rc;
 107
 108         LASSERT(sb != NULL);
 109         rc = ll_statfs_internal(sb, &osfs,
 110                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 111                                 OBD_STATFS_NODELAY);
 112         if (!rc) {
 113                 __u32 blk_size = osfs.os_bsize >> 10;
 114                 __u64 result = osfs.os_blocks;
 115
 116                 while (blk_size >>= 1)
 117                         result <<= 1;
 118
 119                 seq_printf(m, "%llu\n", result);
 120         }
 121         return rc;
 122 }
 123 LPROC_SEQ_FOPS_RO(ll_kbytestotal);
 124
 125 static int ll_kbytesfree_seq_show(struct seq_file *m, void *v)
 126 {
 127         struct super_block *sb = m->private;
 128         struct obd_statfs osfs;
 129         int rc;
 130
 131         LASSERT(sb != NULL);
 132         rc = ll_statfs_internal(sb, &osfs,
 133                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 134                                 OBD_STATFS_NODELAY);
 135         if (!rc) {
 136                 __u32 blk_size = osfs.os_bsize >> 10;
 137                 __u64 result = osfs.os_bfree;
 138
 139                 while (blk_size >>= 1)
 140                         result <<= 1;
 141
 142                 seq_printf(m, "%llu\n", result);
 143         }
 144         return rc;
 145 }
 146 LPROC_SEQ_FOPS_RO(ll_kbytesfree);
 147
 148 static int ll_kbytesavail_seq_show(struct seq_file *m, void *v)
 149 {
 150         struct super_block *sb = m->private;
 151         struct obd_statfs osfs;
 152         int rc;
 153
 154         LASSERT(sb != NULL);
 155         rc = ll_statfs_internal(sb, &osfs,
 156                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 157                                 OBD_STATFS_NODELAY);
 158         if (!rc) {
 159                 __u32 blk_size = osfs.os_bsize >> 10;
 160                 __u64 result = osfs.os_bavail;
 161
 162                 while (blk_size >>= 1)
 163                         result <<= 1;
 164
 165                 seq_printf(m, "%llu\n", result);
 166         }
 167         return rc;
 168 }
 169 LPROC_SEQ_FOPS_RO(ll_kbytesavail);
 170
 171 static int ll_filestotal_seq_show(struct seq_file *m, void *v)
 172 {
 173         struct super_block *sb = m->private;
 174         struct obd_statfs osfs;
 175         int rc;
 176
 177         LASSERT(sb != NULL);
 178         rc = ll_statfs_internal(sb, &osfs,
 179                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 180                                 OBD_STATFS_NODELAY);
 181         if (!rc)
 182                 seq_printf(m, "%llu\n", osfs.os_files);
 183         return rc;
 184 }
 185 LPROC_SEQ_FOPS_RO(ll_filestotal);
 186
 187 static int ll_filesfree_seq_show(struct seq_file *m, void *v)
 188 {
 189         struct super_block *sb = m->private;
 190         struct obd_statfs osfs;
 191         int rc;
 192
 193         LASSERT(sb != NULL);
 194         rc = ll_statfs_internal(sb, &osfs,
 195                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 196                                 OBD_STATFS_NODELAY);
 197         if (!rc)
 198                 seq_printf(m, "%llu\n", osfs.os_ffree);
 199         return rc;
 200 }
 201 LPROC_SEQ_FOPS_RO(ll_filesfree);
 202
 203 static int ll_client_type_seq_show(struct seq_file *m, void *v)
 204 {
 205         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 206
 207         LASSERT(sbi != NULL);
 208
 209         seq_puts(m, "local client\n");
 210         return 0;
 211 }
 212 LPROC_SEQ_FOPS_RO(ll_client_type);
 213
 214 static int ll_fstype_seq_show(struct seq_file *m, void *v)
 215 {
 216         struct super_block *sb = m->private;
 217
 218         LASSERT(sb != NULL);
 219         seq_printf(m, "%s\n", sb->s_type->name);
 220         return 0;
 221 }
 222 LPROC_SEQ_FOPS_RO(ll_fstype);
 223
 224 static int ll_sb_uuid_seq_show(struct seq_file *m, void *v)
 225 {
 226         struct super_block *sb = m->private;
 227
 228         LASSERT(sb != NULL);
 229         seq_printf(m, "%s\n", ll_s2sbi(sb)->ll_sb_uuid.uuid);
 230         return 0;
 231 }
 232 LPROC_SEQ_FOPS_RO(ll_sb_uuid);
 233
 234 static int ll_xattr_cache_seq_show(struct seq_file *m, void *v)
 235 {
 236         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 237
 238         seq_printf(m, "%u\n", sbi->ll_xattr_cache_enabled);
 239         return 0;
 240 }
 241
 242 static ssize_t ll_xattr_cache_seq_write(struct file *file,
 243                                         const char __user *buffer,
 244                                         size_t count, loff_t *off)
 245 {
 246         struct seq_file *m = file->private_data;
 247         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 248         __s64 val;
 249         int rc;
 250
 251         rc = lprocfs_str_to_s64(buffer, count, &val);
 252         if (rc)
 253                 return rc;
 254
 255         if (val != 0 && val != 1)
 256                 return -ERANGE;
 257
 258         if (val == 1 && !(sbi->ll_flags & LL_SBI_XATTR_CACHE))
 259                 return -ENOTSUPP;
 260
 261         sbi->ll_xattr_cache_enabled = val;
 262         sbi->ll_xattr_cache_set = 1;
 263
 264         return count;
 265 }
 266 LPROC_SEQ_FOPS(ll_xattr_cache);
 267
 268 static int ll_site_stats_seq_show(struct seq_file *m, void *v)
 269 {
 270         struct super_block *sb = m->private;
 271
 272         /*
 273          * See description of statistical counters in struct cl_site, and
 274          * struct lu_site.
 275          */
 276         return cl_site_stats_print(lu2cl_site(ll_s2sbi(sb)->ll_site), m);
 277 }
 278 LPROC_SEQ_FOPS_RO(ll_site_stats);
 279
 280 static int ll_max_readahead_mb_seq_show(struct seq_file *m, void *v)
 281 {
 282         struct super_block *sb = m->private;
 283         struct ll_sb_info *sbi = ll_s2sbi(sb);
 284         long pages_number;
 285         int mult;
 286
 287         spin_lock(&sbi->ll_lock);
 288         pages_number = sbi->ll_ra_info.ra_max_pages;
 289         spin_unlock(&sbi->ll_lock);
 290
 291         mult = 1 << (20 - PAGE_SHIFT);
 292         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 293 }
 294
 295 static ssize_t
 296 ll_max_readahead_mb_seq_write(struct file *file, const char __user *buffer,
 297                               size_t count, loff_t *off)
 298 {
 299         struct seq_file *m = file->private_data;
 300         struct super_block *sb = m->private;
 301         struct ll_sb_info *sbi = ll_s2sbi(sb);
 302         __s64 pages_number;
 303         int rc;
 304
 305         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 306         if (rc)
 307                 return rc;
 308
 309         pages_number >>= PAGE_SHIFT;
 310
 311         if (pages_number < 0 || pages_number > totalram_pages / 2) {
 312                 /* 1/2 of RAM */
 313                 CERROR("%s: can't set max_readahead_mb=%lu > %luMB\n",
 314                        ll_get_fsname(sb, NULL, 0),
 315                        (unsigned long)pages_number >> (20 - PAGE_SHIFT),
 316                        totalram_pages >> (20 - PAGE_SHIFT + 1));
 317                 return -ERANGE;
 318         }
 319
 320         spin_lock(&sbi->ll_lock);
 321         sbi->ll_ra_info.ra_max_pages = pages_number;
 322         spin_unlock(&sbi->ll_lock);
 323         return count;
 324 }
 325 LPROC_SEQ_FOPS(ll_max_readahead_mb);
 326
 327 static int ll_max_readahead_per_file_mb_seq_show(struct seq_file *m, void *v)
 328 {
 329         struct super_block *sb = m->private;
 330         struct ll_sb_info *sbi = ll_s2sbi(sb);
 331         long pages_number;
 332         int mult;
 333
 334         spin_lock(&sbi->ll_lock);
 335         pages_number = sbi->ll_ra_info.ra_max_pages_per_file;
 336         spin_unlock(&sbi->ll_lock);
 337
 338         mult = 1 << (20 - PAGE_SHIFT);
 339         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 340 }
 341
 342 static ssize_t
 343 ll_max_readahead_per_file_mb_seq_write(struct file *file,
 344                                        const char __user *buffer,
 345                                        size_t count, loff_t *off)
 346 {
 347         struct seq_file *m = file->private_data;
 348         struct super_block *sb = m->private;
 349         struct ll_sb_info *sbi = ll_s2sbi(sb);
 350         int rc;
 351         __s64 pages_number;
 352
 353         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 354         if (rc)
 355                 return rc;
 356
 357         pages_number >>= PAGE_SHIFT;
 358
 359         if (pages_number < 0 || pages_number > sbi->ll_ra_info.ra_max_pages) {
 360                 CERROR("%s: can't set max_readahead_per_file_mb=%lu > "
 361                        "max_read_ahead_mb=%lu\n", ll_get_fsname(sb, NULL, 0),
 362                        (unsigned long)pages_number >> (20 - PAGE_SHIFT),
 363                        sbi->ll_ra_info.ra_max_pages >> (20 - PAGE_SHIFT));
 364                 return -ERANGE;
 365         }
 366
 367         spin_lock(&sbi->ll_lock);
 368         sbi->ll_ra_info.ra_max_pages_per_file = pages_number;
 369         spin_unlock(&sbi->ll_lock);
 370         return count;
 371 }
 372 LPROC_SEQ_FOPS(ll_max_readahead_per_file_mb);
 373
 374 static int ll_max_read_ahead_whole_mb_seq_show(struct seq_file *m, void *v)
 375 {
 376         struct super_block *sb = m->private;
 377         struct ll_sb_info *sbi = ll_s2sbi(sb);
 378         long pages_number;
 379         int mult;
 380
 381         spin_lock(&sbi->ll_lock);
 382         pages_number = sbi->ll_ra_info.ra_max_read_ahead_whole_pages;
 383         spin_unlock(&sbi->ll_lock);
 384
 385         mult = 1 << (20 - PAGE_SHIFT);
 386         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 387 }
 388
 389 static ssize_t
 390 ll_max_read_ahead_whole_mb_seq_write(struct file *file,
 391                                      const char __user *buffer,
 392                                      size_t count, loff_t *off)
 393 {
 394         struct seq_file *m = file->private_data;
 395         struct super_block *sb = m->private;
 396         struct ll_sb_info *sbi = ll_s2sbi(sb);
 397         int rc;
 398         __s64 pages_number;
 399
 400         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 401         if (rc)
 402                 return rc;
 403
 404         pages_number >>= PAGE_SHIFT;
 405
 406         /* Cap this at the current max readahead window size, the readahead
 407          * algorithm does this anyway so it's pointless to set it larger. */
 408         if (pages_number < 0 ||
 409             pages_number > sbi->ll_ra_info.ra_max_pages_per_file) {
 410                 int pages_shift = 20 - PAGE_SHIFT;
 411                 CERROR("%s: can't set max_read_ahead_whole_mb=%lu > "
 412                        "max_read_ahead_per_file_mb=%lu\n",
 413                        ll_get_fsname(sb, NULL, 0),
 414                        (unsigned long)pages_number >> pages_shift,
 415                        sbi->ll_ra_info.ra_max_pages_per_file >> pages_shift);
 416                 return -ERANGE;
 417         }
 418
 419         spin_lock(&sbi->ll_lock);
 420         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = pages_number;
 421         spin_unlock(&sbi->ll_lock);
 422         return count;
 423 }
 424 LPROC_SEQ_FOPS(ll_max_read_ahead_whole_mb);
 425
 426 static int ll_max_cached_mb_seq_show(struct seq_file *m, void *v)
 427 {
 428         struct super_block     *sb    = m->private;
 429         struct ll_sb_info      *sbi   = ll_s2sbi(sb);
 430         struct cl_client_cache *cache = sbi->ll_cache;
 431         int shift = 20 - PAGE_SHIFT;
 432         long max_cached_mb;
 433         long unused_mb;
 434
 435         max_cached_mb = cache->ccc_lru_max >> shift;
 436         unused_mb = atomic_long_read(&cache->ccc_lru_left) >> shift;
 437         seq_printf(m, "users: %d\n"
 438                    "max_cached_mb: %ld\n"
 439                    "used_mb: %ld\n"
 440                    "unused_mb: %ld\n"
 441                    "reclaim_count: %u\n",
 442                    atomic_read(&cache->ccc_users),
 443                    max_cached_mb,
 444                    max_cached_mb - unused_mb,
 445                    unused_mb,
 446                    cache->ccc_lru_shrinkers);
 447         return 0;
 448 }
 449
 450 static ssize_t
 451 ll_max_cached_mb_seq_write(struct file *file, const char __user *buffer,
 452                            size_t count, loff_t *off)
 453 {
 454         struct seq_file *m = file->private_data;
 455         struct super_block *sb = m->private;
 456         struct ll_sb_info *sbi = ll_s2sbi(sb);
 457         struct cl_client_cache *cache = sbi->ll_cache;
 458         struct lu_env *env;
 459         long diff = 0;
 460         long nrpages = 0;
 461         __u16 refcheck;
 462         __s64 pages_number;
 463         long rc;
 464         char kernbuf[128];
 465         ENTRY;
 466
 467         if (count >= sizeof(kernbuf))
 468                 RETURN(-EINVAL);
 469
 470         if (copy_from_user(kernbuf, buffer, count))
 471                 RETURN(-EFAULT);
 472         kernbuf[count] = 0;
 473
 474         buffer += lprocfs_find_named_value(kernbuf, "max_cached_mb:", &count) -
 475                   kernbuf;
 476         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 477         if (rc)
 478                 RETURN(rc);
 479
 480         pages_number >>= PAGE_SHIFT;
 481
 482         if (pages_number < 0 || pages_number > totalram_pages) {
 483                 CERROR("%s: can't set max cache more than %lu MB\n",
 484                        ll_get_fsname(sb, NULL, 0),
 485                        totalram_pages >> (20 - PAGE_SHIFT));
 486                 RETURN(-ERANGE);
 487         }
 488         /* Allow enough cache so clients can make well-formed RPCs */
 489         pages_number = max_t(long, pages_number, PTLRPC_MAX_BRW_PAGES);
 490
 491         spin_lock(&sbi->ll_lock);
 492         diff = pages_number - cache->ccc_lru_max;
 493         spin_unlock(&sbi->ll_lock);
 494
 495         /* easy - add more LRU slots. */
 496         if (diff >= 0) {
 497                 atomic_long_add(diff, &cache->ccc_lru_left);
 498                 GOTO(out, rc = 0);
 499         }
 500
 501         env = cl_env_get(&refcheck);
 502         if (IS_ERR(env))
 503                 RETURN(rc);
 504
 505         diff = -diff;
 506         while (diff > 0) {
 507                 long tmp;
 508
 509                 /* reduce LRU budget from free slots. */
 510                 do {
 511                         long ov, nv;
 512
 513                         ov = atomic_long_read(&cache->ccc_lru_left);
 514                         if (ov == 0)
 515                                 break;
 516
 517                         nv = ov > diff ? ov - diff : 0;
 518                         rc = atomic_long_cmpxchg(&cache->ccc_lru_left, ov, nv);
 519                         if (likely(ov == rc)) {
 520                                 diff -= ov - nv;
 521                                 nrpages += ov - nv;
 522                                 break;
 523                         }
 524                 } while (1);
 525
 526                 if (diff <= 0)
 527                         break;
 528
 529                 if (sbi->ll_dt_exp == NULL) { /* being initialized */
 530                         rc = -ENODEV;
 531                         break;
 532                 }
 533
 534                 /* difficult - have to ask OSCs to drop LRU slots. */
 535                 tmp = diff << 1;
 536                 rc = obd_set_info_async(env, sbi->ll_dt_exp,
 537                                 sizeof(KEY_CACHE_LRU_SHRINK),
 538                                 KEY_CACHE_LRU_SHRINK,
 539                                 sizeof(tmp), &tmp, NULL);
 540                 if (rc < 0)
 541                         break;
 542         }
 543         cl_env_put(env, &refcheck);
 544
 545 out:
 546         if (rc >= 0) {
 547                 spin_lock(&sbi->ll_lock);
 548                 cache->ccc_lru_max = pages_number;
 549                 spin_unlock(&sbi->ll_lock);
 550                 rc = count;
 551         } else {
 552                 atomic_long_add(nrpages, &cache->ccc_lru_left);
 553         }
 554         return rc;
 555 }
 556 LPROC_SEQ_FOPS(ll_max_cached_mb);
 557
 558 static int ll_checksum_seq_show(struct seq_file *m, void *v)
 559 {
 560         struct super_block *sb = m->private;
 561         struct ll_sb_info *sbi = ll_s2sbi(sb);
 562
 563         seq_printf(m, "%u\n", (sbi->ll_flags & LL_SBI_CHECKSUM) ? 1 : 0);
 564         return 0;
 565 }
 566
 567 static ssize_t ll_checksum_seq_write(struct file *file,
 568                                      const char __user *buffer,
 569                                      size_t count, loff_t *off)
 570 {
 571         struct seq_file *m = file->private_data;
 572         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 573         int rc;
 574         __s64 val;
 575
 576         if (!sbi->ll_dt_exp)
 577                 /* Not set up yet */
 578                 return -EAGAIN;
 579
 580         rc = lprocfs_str_to_s64(buffer, count, &val);
 581         if (rc)
 582                 return rc;
 583         if (val)
 584                 sbi->ll_flags |= LL_SBI_CHECKSUM;
 585         else
 586                 sbi->ll_flags &= ~LL_SBI_CHECKSUM;
 587
 588         rc = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 589                                 KEY_CHECKSUM, sizeof(val), &val, NULL);
 590         if (rc)
 591                 CWARN("Failed to set OSC checksum flags: %d\n", rc);
 592
 593         return count;
 594 }
 595 LPROC_SEQ_FOPS(ll_checksum);
 596
 597 static int ll_rd_track_id(struct seq_file *m, enum stats_track_type type)
 598 {
 599         struct super_block *sb = m->private;
 600
 601         if (ll_s2sbi(sb)->ll_stats_track_type == type) {
 602                 seq_printf(m, "%d\n",
 603                            ll_s2sbi(sb)->ll_stats_track_id);
 604         } else if (ll_s2sbi(sb)->ll_stats_track_type == STATS_TRACK_ALL) {
 605                 seq_puts(m, "0 (all)\n");
 606         } else {
 607                 seq_puts(m, "untracked\n");
 608         }
 609         return 0;
 610 }
 611
 612 static int ll_wr_track_id(const char __user *buffer, unsigned long count,
 613                           void *data, enum stats_track_type type)
 614 {
 615         struct super_block *sb = data;
 616         int rc;
 617         __s64 pid;
 618
 619         rc = lprocfs_str_to_s64(buffer, count, &pid);
 620         if (rc)
 621                 return rc;
 622         if (pid > INT_MAX || pid < 0)
 623                 return -ERANGE;
 624
 625         ll_s2sbi(sb)->ll_stats_track_id = pid;
 626         if (pid == 0)
 627                 ll_s2sbi(sb)->ll_stats_track_type = STATS_TRACK_ALL;
 628         else
 629                 ll_s2sbi(sb)->ll_stats_track_type = type;
 630         lprocfs_clear_stats(ll_s2sbi(sb)->ll_stats);
 631         return count;
 632 }
 633
 634 static int ll_track_pid_seq_show(struct seq_file *m, void *v)
 635 {
 636         return ll_rd_track_id(m, STATS_TRACK_PID);
 637 }
 638
 639 static ssize_t ll_track_pid_seq_write(struct file *file,
 640                                       const char __user *buffer,
 641                                       size_t count, loff_t *off)
 642 {
 643         struct seq_file *seq = file->private_data;
 644         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PID);
 645 }
 646 LPROC_SEQ_FOPS(ll_track_pid);
 647
 648 static int ll_track_ppid_seq_show(struct seq_file *m, void *v)
 649 {
 650         return ll_rd_track_id(m, STATS_TRACK_PPID);
 651 }
 652
 653 static ssize_t ll_track_ppid_seq_write(struct file *file,
 654                                        const char __user *buffer,
 655                                        size_t count, loff_t *off)
 656 {
 657         struct seq_file *seq = file->private_data;
 658         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PPID);
 659 }
 660 LPROC_SEQ_FOPS(ll_track_ppid);
 661
 662 static int ll_track_gid_seq_show(struct seq_file *m, void *v)
 663 {
 664         return ll_rd_track_id(m, STATS_TRACK_GID);
 665 }
 666
 667 static ssize_t ll_track_gid_seq_write(struct file *file,
 668                                       const char __user *buffer,
 669                                       size_t count, loff_t *off)
 670 {
 671         struct seq_file *seq = file->private_data;
 672         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_GID);
 673 }
 674 LPROC_SEQ_FOPS(ll_track_gid);
 675
 676 static int ll_statahead_max_seq_show(struct seq_file *m, void *v)
 677 {
 678         struct super_block *sb = m->private;
 679         struct ll_sb_info *sbi = ll_s2sbi(sb);
 680
 681         seq_printf(m, "%u\n", sbi->ll_sa_max);
 682         return 0;
 683 }
 684
 685 static ssize_t ll_statahead_max_seq_write(struct file *file,
 686                                           const char __user *buffer,
 687                                           size_t count, loff_t *off)
 688 {
 689         struct seq_file *m = file->private_data;
 690         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 691         int rc;
 692         __s64 val;
 693
 694         rc = lprocfs_str_to_s64(buffer, count, &val);
 695         if (rc)
 696                 return rc;
 697
 698         if (val >= 0 && val <= LL_SA_RPC_MAX)
 699                 sbi->ll_sa_max = val;
 700         else
 701                 CERROR("Bad statahead_max value %lld. Valid values are in "
 702                        "the range [0, %d]\n", val, LL_SA_RPC_MAX);
 703
 704         return count;
 705 }
 706 LPROC_SEQ_FOPS(ll_statahead_max);
 707
 708 static int ll_statahead_agl_seq_show(struct seq_file *m, void *v)
 709 {
 710         struct super_block *sb = m->private;
 711         struct ll_sb_info *sbi = ll_s2sbi(sb);
 712
 713         seq_printf(m, "%u\n",
 714                    sbi->ll_flags & LL_SBI_AGL_ENABLED ? 1 : 0);
 715         return 0;
 716 }
 717
 718 static ssize_t ll_statahead_agl_seq_write(struct file *file,
 719                                           const char __user *buffer,
 720                                           size_t count, loff_t *off)
 721 {
 722         struct seq_file *m = file->private_data;
 723         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 724         int rc;
 725         __s64 val;
 726
 727         rc = lprocfs_str_to_s64(buffer, count, &val);
 728         if (rc)
 729                 return rc;
 730
 731         if (val)
 732                 sbi->ll_flags |= LL_SBI_AGL_ENABLED;
 733         else
 734                 sbi->ll_flags &= ~LL_SBI_AGL_ENABLED;
 735
 736         return count;
 737 }
 738 LPROC_SEQ_FOPS(ll_statahead_agl);
 739
 740 static int ll_statahead_stats_seq_show(struct seq_file *m, void *v)
 741 {
 742         struct super_block *sb = m->private;
 743         struct ll_sb_info *sbi = ll_s2sbi(sb);
 744
 745         seq_printf(m, "statahead total: %u\n"
 746                     "statahead wrong: %u\n"
 747                     "agl total: %u\n",
 748                     atomic_read(&sbi->ll_sa_total),
 749                     atomic_read(&sbi->ll_sa_wrong),
 750                     atomic_read(&sbi->ll_agl_total));
 751         return 0;
 752 }
 753 LPROC_SEQ_FOPS_RO(ll_statahead_stats);
 754
 755 static int ll_lazystatfs_seq_show(struct seq_file *m, void *v)
 756 {
 757         struct super_block *sb = m->private;
 758         struct ll_sb_info *sbi = ll_s2sbi(sb);
 759
 760         seq_printf(m, "%u\n",
 761                    (sbi->ll_flags & LL_SBI_LAZYSTATFS) ? 1 : 0);
 762         return 0;
 763 }
 764
 765 static ssize_t ll_lazystatfs_seq_write(struct file *file,
 766                                        const char __user *buffer,
 767                                         size_t count, loff_t *off)
 768 {
 769         struct seq_file *m = file->private_data;
 770         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 771         int rc;
 772         __s64 val;
 773
 774         rc = lprocfs_str_to_s64(buffer, count, &val);
 775         if (rc)
 776                 return rc;
 777
 778         if (val)
 779                 sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 780         else
 781                 sbi->ll_flags &= ~LL_SBI_LAZYSTATFS;
 782
 783         return count;
 784 }
 785 LPROC_SEQ_FOPS(ll_lazystatfs);
 786
 787 static int ll_max_easize_seq_show(struct seq_file *m, void *v)
 788 {
 789         struct super_block *sb = m->private;
 790         struct ll_sb_info *sbi = ll_s2sbi(sb);
 791         unsigned int ealen;
 792         int rc;
 793
 794         rc = ll_get_max_mdsize(sbi, &ealen);
 795         if (rc)
 796                 return rc;
 797
 798         seq_printf(m, "%u\n", ealen);
 799         return 0;
 800 }
 801 LPROC_SEQ_FOPS_RO(ll_max_easize);
 802
 803 /**
 804  * Get default_easize.
 805  *
 806  * \see client_obd::cl_default_mds_easize
 807  *
 808  * \param[in] m         seq_file handle
 809  * \param[in] v         unused for single entry
 810  *
 811  * \retval 0            on success
 812  * \retval negative     negated errno on failure
 813  */
 814 static int ll_default_easize_seq_show(struct seq_file *m, void *v)
 815 {
 816         struct super_block *sb = m->private;
 817         struct ll_sb_info *sbi = ll_s2sbi(sb);
 818         unsigned int ealen;
 819         int rc;
 820
 821         rc = ll_get_default_mdsize(sbi, &ealen);
 822         if (rc)
 823                 return rc;
 824
 825         seq_printf(m, "%u\n", ealen);
 826         return 0;
 827 }
 828
 829 /**
 830  * Set default_easize.
 831  *
 832  * Range checking on the passed value is handled by
 833  * ll_set_default_mdsize().
 834  *
 835  * \see client_obd::cl_default_mds_easize
 836  *
 837  * \param[in] file      proc file
 838  * \param[in] buffer    string passed from user space
 839  * \param[in] count     \a buffer length
 840  * \param[in] off       unused for single entry
 841  *
 842  * \retval positive     \a count on success
 843  * \retval negative     negated errno on failure
 844  */
 845 static ssize_t ll_default_easize_seq_write(struct file *file,
 846                                            const char __user *buffer,
 847                                            size_t count, loff_t *unused)
 848 {
 849         struct seq_file *seq = file->private_data;
 850         struct super_block *sb = (struct super_block *)seq->private;
 851         struct ll_sb_info *sbi = ll_s2sbi(sb);
 852         __s64 val;
 853         int rc;
 854
 855         if (count == 0)
 856                 return 0;
 857
 858         rc = lprocfs_str_to_s64(buffer, count, &val);
 859         if (rc)
 860                 return rc;
 861         if (val < 0 || val > INT_MAX)
 862                 return -ERANGE;
 863
 864         rc = ll_set_default_mdsize(sbi, val);
 865         if (rc)
 866                 return rc;
 867
 868         return count;
 869 }
 870 LPROC_SEQ_FOPS(ll_default_easize);
 871
 872 static int ll_sbi_flags_seq_show(struct seq_file *m, void *v)
 873 {
 874         const char *str[] = LL_SBI_FLAGS;
 875         struct super_block *sb = m->private;
 876         int flags = ll_s2sbi(sb)->ll_flags;
 877         int i = 0;
 878
 879         while (flags != 0) {
 880                 if (ARRAY_SIZE(str) <= i) {
 881                         CERROR("%s: Revise array LL_SBI_FLAGS to match sbi "
 882                                 "flags please.\n", ll_get_fsname(sb, NULL, 0));
 883                         return -EINVAL;
 884                 }
 885
 886                 if (flags & 0x1)
 887                         seq_printf(m, "%s ", str[i]);
 888                 flags >>= 1;
 889                 ++i;
 890         }
 891         seq_printf(m, "\b\n");
 892         return 0;
 893 }
 894 LPROC_SEQ_FOPS_RO(ll_sbi_flags);
 895
 896 static int ll_fast_read_seq_show(struct seq_file *m, void *v)
 897 {
 898         struct super_block *sb = m->private;
 899         struct ll_sb_info *sbi = ll_s2sbi(sb);
 900
 901         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_FAST_READ));
 902         return 0;
 903 }
 904
 905 static ssize_t
 906 ll_fast_read_seq_write(struct file *file, const char __user *buffer,
 907                        size_t count, loff_t *off)
 908 {
 909         struct seq_file *m = file->private_data;
 910         struct super_block *sb = m->private;
 911         struct ll_sb_info *sbi = ll_s2sbi(sb);
 912         int rc;
 913         __s64 val;
 914
 915         rc = lprocfs_str_to_s64(buffer, count, &val);
 916         if (rc)
 917                 return rc;
 918
 919         spin_lock(&sbi->ll_lock);
 920         if (val == 1)
 921                 sbi->ll_flags |= LL_SBI_FAST_READ;
 922         else
 923                 sbi->ll_flags &= ~LL_SBI_FAST_READ;
 924         spin_unlock(&sbi->ll_lock);
 925
 926         return count;
 927 }
 928 LPROC_SEQ_FOPS(ll_fast_read);
 929
 930 static int ll_pio_seq_show(struct seq_file *m, void *v)
 931 {
 932         struct super_block *sb = m->private;
 933         struct ll_sb_info *sbi = ll_s2sbi(sb);
 934
 935         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_PIO));
 936         return 0;
 937 }
 938
 939 static ssize_t ll_pio_seq_write(struct file *file, const char __user *buffer,
 940                                 size_t count, loff_t *off)
 941 {
 942         struct seq_file *m = file->private_data;
 943         struct super_block *sb = m->private;
 944         struct ll_sb_info *sbi = ll_s2sbi(sb);
 945         int rc;
 946         __s64 val;
 947
 948         rc = lprocfs_str_to_s64(buffer, count, &val);
 949         if (rc)
 950                 return rc;
 951
 952         spin_lock(&sbi->ll_lock);
 953         if (val == 1)
 954                 sbi->ll_flags |= LL_SBI_PIO;
 955         else
 956                 sbi->ll_flags &= ~LL_SBI_PIO;
 957         spin_unlock(&sbi->ll_lock);
 958
 959         return count;
 960 }
 961 LPROC_SEQ_FOPS(ll_pio);
 962
 963 static int ll_unstable_stats_seq_show(struct seq_file *m, void *v)
 964 {
 965         struct super_block      *sb    = m->private;
 966         struct ll_sb_info       *sbi   = ll_s2sbi(sb);
 967         struct cl_client_cache  *cache = sbi->ll_cache;
 968         long pages;
 969         int mb;
 970
 971         pages = atomic_long_read(&cache->ccc_unstable_nr);
 972         mb    = (pages * PAGE_SIZE) >> 20;
 973
 974         seq_printf(m, "unstable_check:     %8d\n"
 975                    "unstable_pages: %12ld\n"
 976                    "unstable_mb:        %8d\n",
 977                    cache->ccc_unstable_check, pages, mb);
 978         return 0;
 979 }
 980
 981 static ssize_t ll_unstable_stats_seq_write(struct file *file,
 982                                            const char __user *buffer,
 983                                            size_t count, loff_t *unused)
 984 {
 985         struct seq_file *seq = file->private_data;
 986         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)seq->private);
 987         char kernbuf[128];
 988         int rc;
 989         __s64 val;
 990
 991         if (count == 0)
 992                 return 0;
 993         if (count >= sizeof(kernbuf))
 994                 return -EINVAL;
 995
 996         if (copy_from_user(kernbuf, buffer, count))
 997                 return -EFAULT;
 998         kernbuf[count] = 0;
 999
1000         buffer += lprocfs_find_named_value(kernbuf, "unstable_check:", &count) -
1001                   kernbuf;
1002         rc = lprocfs_str_to_s64(buffer, count, &val);
1003         if (rc < 0)
1004                 return rc;
1005
1006         /* borrow lru lock to set the value */
1007         spin_lock(&sbi->ll_cache->ccc_lru_lock);
1008         sbi->ll_cache->ccc_unstable_check = !!val;
1009         spin_unlock(&sbi->ll_cache->ccc_lru_lock);
1010
1011         return count;
1012 }
1013 LPROC_SEQ_FOPS(ll_unstable_stats);
1014
1015 static int ll_root_squash_seq_show(struct seq_file *m, void *v)
1016 {
1017         struct super_block *sb = m->private;
1018         struct ll_sb_info *sbi = ll_s2sbi(sb);
1019         struct root_squash_info *squash = &sbi->ll_squash;
1020
1021         seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
1022         return 0;
1023 }
1024
1025 static ssize_t ll_root_squash_seq_write(struct file *file,
1026                                         const char __user *buffer,
1027                                         size_t count, loff_t *off)
1028 {
1029         struct seq_file *m = file->private_data;
1030         struct super_block *sb = m->private;
1031         struct ll_sb_info *sbi = ll_s2sbi(sb);
1032         struct root_squash_info *squash = &sbi->ll_squash;
1033
1034         return lprocfs_wr_root_squash(buffer, count, squash,
1035                                       ll_get_fsname(sb, NULL, 0));
1036 }
1037 LPROC_SEQ_FOPS(ll_root_squash);
1038
1039 static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
1040 {
1041         struct super_block *sb = m->private;
1042         struct ll_sb_info *sbi = ll_s2sbi(sb);
1043         struct root_squash_info *squash = &sbi->ll_squash;
1044         int len;
1045
1046         down_read(&squash->rsi_sem);
1047         if (!list_empty(&squash->rsi_nosquash_nids)) {
1048                 len = cfs_print_nidlist(m->buf + m->count, m->size - m->count,
1049                                         &squash->rsi_nosquash_nids);
1050                 m->count += len;
1051                 seq_putc(m, '\n');
1052         } else {
1053                 seq_puts(m, "NONE\n");
1054         }
1055         up_read(&squash->rsi_sem);
1056
1057         return 0;
1058 }
1059
1060 static ssize_t ll_nosquash_nids_seq_write(struct file *file,
1061                                           const char __user *buffer,
1062                                           size_t count, loff_t *off)
1063 {
1064         struct seq_file *m = file->private_data;
1065         struct super_block *sb = m->private;
1066         struct ll_sb_info *sbi = ll_s2sbi(sb);
1067         struct root_squash_info *squash = &sbi->ll_squash;
1068         int rc;
1069
1070         rc = lprocfs_wr_nosquash_nids(buffer, count, squash,
1071                                       ll_get_fsname(sb, NULL, 0));
1072         if (rc < 0)
1073                 return rc;
1074
1075         ll_compute_rootsquash_state(sbi);
1076
1077         return rc;
1078 }
1079 LPROC_SEQ_FOPS(ll_nosquash_nids);
1080
1081 struct lprocfs_vars lprocfs_llite_obd_vars[] = {
1082         { .name =       "uuid",
1083           .fops =       &ll_sb_uuid_fops                        },
1084         { .name =       "fstype",
1085           .fops =       &ll_fstype_fops                         },
1086         { .name =       "site",
1087           .fops =       &ll_site_stats_fops                     },
1088         { .name =       "blocksize",
1089           .fops =       &ll_blksize_fops                        },
1090         { .name =       "stat_blocksize",
1091           .fops =       &ll_stat_blksize_fops                   },
1092         { .name =       "kbytestotal",
1093           .fops =       &ll_kbytestotal_fops                    },
1094         { .name =       "kbytesfree",
1095           .fops =       &ll_kbytesfree_fops                     },
1096         { .name =       "kbytesavail",
1097           .fops =       &ll_kbytesavail_fops                    },
1098         { .name =       "filestotal",
1099           .fops =       &ll_filestotal_fops                     },
1100         { .name =       "filesfree",
1101           .fops =       &ll_filesfree_fops                      },
1102         { .name =       "client_type",
1103           .fops =       &ll_client_type_fops                    },
1104         { .name =       "max_read_ahead_mb",
1105           .fops =       &ll_max_readahead_mb_fops               },
1106         { .name =       "max_read_ahead_per_file_mb",
1107           .fops =       &ll_max_readahead_per_file_mb_fops      },
1108         { .name =       "max_read_ahead_whole_mb",
1109           .fops =       &ll_max_read_ahead_whole_mb_fops        },
1110         { .name =       "max_cached_mb",
1111           .fops =       &ll_max_cached_mb_fops                  },
1112         { .name =       "checksum_pages",
1113           .fops =       &ll_checksum_fops                       },
1114         { .name =       "stats_track_pid",
1115           .fops =       &ll_track_pid_fops                      },
1116         { .name =       "stats_track_ppid",
1117           .fops =       &ll_track_ppid_fops                     },
1118         { .name =       "stats_track_gid",
1119           .fops =       &ll_track_gid_fops                      },
1120         { .name =       "statahead_max",
1121           .fops =       &ll_statahead_max_fops                  },
1122         { .name =       "statahead_agl",
1123           .fops =       &ll_statahead_agl_fops                  },
1124         { .name =       "statahead_stats",
1125           .fops =       &ll_statahead_stats_fops                },
1126         { .name =       "lazystatfs",
1127           .fops =       &ll_lazystatfs_fops                     },
1128         { .name =       "max_easize",
1129           .fops =       &ll_max_easize_fops                     },
1130         { .name =       "default_easize",
1131           .fops =       &ll_default_easize_fops                 },
1132         { .name =       "sbi_flags",
1133           .fops =       &ll_sbi_flags_fops                      },
1134         { .name =       "xattr_cache",
1135           .fops =       &ll_xattr_cache_fops                    },
1136         { .name =       "unstable_stats",
1137           .fops =       &ll_unstable_stats_fops                 },
1138         { .name =       "root_squash",
1139           .fops =       &ll_root_squash_fops                    },
1140         { .name =       "nosquash_nids",
1141           .fops =       &ll_nosquash_nids_fops                  },
1142         { .name =       "fast_read",
1143           .fops =       &ll_fast_read_fops,                     },
1144         { .name =       "pio",
1145           .fops =       &ll_pio_fops,                           },
1146         { NULL }
1147 };
1148
1149 #define MAX_STRING_SIZE 128
1150
1151 static const struct llite_file_opcode {
1152         __u32       opcode;
1153         __u32       type;
1154         const char *opname;
1155 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
1156         /* file operation */
1157         { LPROC_LL_DIRTY_HITS,     LPROCFS_TYPE_REGS, "dirty_pages_hits" },
1158         { LPROC_LL_DIRTY_MISSES,   LPROCFS_TYPE_REGS, "dirty_pages_misses" },
1159         { LPROC_LL_READ_BYTES,     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1160                                    "read_bytes" },
1161         { LPROC_LL_WRITE_BYTES,    LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1162                                    "write_bytes" },
1163         { LPROC_LL_BRW_READ,       LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1164                                    "brw_read" },
1165         { LPROC_LL_BRW_WRITE,      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1166                                    "brw_write" },
1167         { LPROC_LL_IOCTL,          LPROCFS_TYPE_REGS, "ioctl" },
1168         { LPROC_LL_OPEN,           LPROCFS_TYPE_REGS, "open" },
1169         { LPROC_LL_RELEASE,        LPROCFS_TYPE_REGS, "close" },
1170         { LPROC_LL_MAP,            LPROCFS_TYPE_REGS, "mmap" },
1171         { LPROC_LL_FAULT,          LPROCFS_TYPE_REGS, "page_fault" },
1172         { LPROC_LL_MKWRITE,        LPROCFS_TYPE_REGS, "page_mkwrite" },
1173         { LPROC_LL_LLSEEK,         LPROCFS_TYPE_REGS, "seek" },
1174         { LPROC_LL_FSYNC,          LPROCFS_TYPE_REGS, "fsync" },
1175         { LPROC_LL_READDIR,        LPROCFS_TYPE_REGS, "readdir" },
1176         /* inode operation */
1177         { LPROC_LL_SETATTR,        LPROCFS_TYPE_REGS, "setattr" },
1178         { LPROC_LL_TRUNC,          LPROCFS_TYPE_REGS, "truncate" },
1179         { LPROC_LL_FLOCK,          LPROCFS_TYPE_REGS, "flock" },
1180         { LPROC_LL_GETATTR,        LPROCFS_TYPE_REGS, "getattr" },
1181         /* dir inode operation */
1182         { LPROC_LL_CREATE,         LPROCFS_TYPE_REGS, "create" },
1183         { LPROC_LL_LINK,           LPROCFS_TYPE_REGS, "link" },
1184         { LPROC_LL_UNLINK,         LPROCFS_TYPE_REGS, "unlink" },
1185         { LPROC_LL_SYMLINK,        LPROCFS_TYPE_REGS, "symlink" },
1186         { LPROC_LL_MKDIR,          LPROCFS_TYPE_REGS, "mkdir" },
1187         { LPROC_LL_RMDIR,          LPROCFS_TYPE_REGS, "rmdir" },
1188         { LPROC_LL_MKNOD,          LPROCFS_TYPE_REGS, "mknod" },
1189         { LPROC_LL_RENAME,         LPROCFS_TYPE_REGS, "rename" },
1190         /* special inode operation */
1191         { LPROC_LL_STAFS,          LPROCFS_TYPE_REGS, "statfs" },
1192         { LPROC_LL_ALLOC_INODE,    LPROCFS_TYPE_REGS, "alloc_inode" },
1193         { LPROC_LL_SETXATTR,       LPROCFS_TYPE_REGS, "setxattr" },
1194         { LPROC_LL_GETXATTR,       LPROCFS_TYPE_REGS, "getxattr" },
1195         { LPROC_LL_GETXATTR_HITS,  LPROCFS_TYPE_REGS, "getxattr_hits" },
1196         { LPROC_LL_LISTXATTR,      LPROCFS_TYPE_REGS, "listxattr" },
1197         { LPROC_LL_REMOVEXATTR,    LPROCFS_TYPE_REGS, "removexattr" },
1198         { LPROC_LL_INODE_PERM,     LPROCFS_TYPE_REGS, "inode_permission" },
1199 };
1200
1201 void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
1202 {
1203         if (!sbi->ll_stats)
1204                 return;
1205         if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
1206                 lprocfs_counter_add(sbi->ll_stats, op, count);
1207         else if (sbi->ll_stats_track_type == STATS_TRACK_PID &&
1208                  sbi->ll_stats_track_id == current->pid)
1209                 lprocfs_counter_add(sbi->ll_stats, op, count);
1210         else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
1211                  sbi->ll_stats_track_id == current->parent->pid)
1212                 lprocfs_counter_add(sbi->ll_stats, op, count);
1213         else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
1214                  sbi->ll_stats_track_id ==
1215                         from_kgid(&init_user_ns, current_gid()))
1216                 lprocfs_counter_add(sbi->ll_stats, op, count);
1217 }
1218 EXPORT_SYMBOL(ll_stats_ops_tally);
1219
1220 static const char *ra_stat_string[] = {
1221         [RA_STAT_HIT] = "hits",
1222         [RA_STAT_MISS] = "misses",
1223         [RA_STAT_DISTANT_READPAGE] = "readpage not consecutive",
1224         [RA_STAT_MISS_IN_WINDOW] = "miss inside window",
1225         [RA_STAT_FAILED_GRAB_PAGE] = "failed grab_cache_page",
1226         [RA_STAT_FAILED_MATCH] = "failed lock match",
1227         [RA_STAT_DISCARDED] = "read but discarded",
1228         [RA_STAT_ZERO_LEN] = "zero length file",
1229         [RA_STAT_ZERO_WINDOW] = "zero size window",
1230         [RA_STAT_EOF] = "read-ahead to EOF",
1231         [RA_STAT_MAX_IN_FLIGHT] = "hit max r-a issue",
1232         [RA_STAT_WRONG_GRAB_PAGE] = "wrong page from grab_cache_page",
1233         [RA_STAT_FAILED_REACH_END] = "failed to reach end"
1234 };
1235
1236 LPROC_SEQ_FOPS_RO_TYPE(llite, name);
1237 LPROC_SEQ_FOPS_RO_TYPE(llite, uuid);
1238
1239 int lprocfs_ll_register_mountpoint(struct proc_dir_entry *parent,
1240                                    struct super_block *sb)
1241 {
1242         struct lprocfs_vars lvars[2];
1243         struct lustre_sb_info *lsi = s2lsi(sb);
1244         struct ll_sb_info *sbi = ll_s2sbi(sb);
1245         char name[MAX_STRING_SIZE + 1], *ptr;
1246         int err, id, len, rc;
1247         ENTRY;
1248
1249         memset(lvars, 0, sizeof(lvars));
1250
1251         name[MAX_STRING_SIZE] = '\0';
1252         lvars[0].name = name;
1253
1254         LASSERT(sbi != NULL);
1255
1256         /* Get fsname */
1257         len = strlen(lsi->lsi_lmd->lmd_profile);
1258         ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
1259         if (ptr && (strcmp(ptr, "-client") == 0))
1260                 len -= 7;
1261
1262         /* Mount info */
1263         snprintf(name, MAX_STRING_SIZE, "%.*s-%p", len,
1264                  lsi->lsi_lmd->lmd_profile, sb);
1265
1266         sbi->ll_proc_root = lprocfs_register(name, parent, NULL, NULL);
1267         if (IS_ERR(sbi->ll_proc_root)) {
1268                 err = PTR_ERR(sbi->ll_proc_root);
1269                 sbi->ll_proc_root = NULL;
1270                 RETURN(err);
1271         }
1272
1273         rc = lprocfs_seq_create(sbi->ll_proc_root, "dump_page_cache", 0444,
1274                                 &vvp_dump_pgcache_file_ops, sbi);
1275         if (rc)
1276                 CWARN("Error adding the dump_page_cache file\n");
1277
1278         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats", 0644,
1279                                 &ll_rw_extents_stats_fops, sbi);
1280         if (rc)
1281                 CWARN("Error adding the extent_stats file\n");
1282
1283         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats_per_process",
1284                                 0644, &ll_rw_extents_stats_pp_fops, sbi);
1285         if (rc)
1286                 CWARN("Error adding the extents_stats_per_process file\n");
1287
1288         rc = lprocfs_seq_create(sbi->ll_proc_root, "offset_stats", 0644,
1289                                 &ll_rw_offset_stats_fops, sbi);
1290         if (rc)
1291                 CWARN("Error adding the offset_stats file\n");
1292
1293         /* File operations stats */
1294         sbi->ll_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES,
1295                                             LPROCFS_STATS_FLAG_NONE);
1296         if (sbi->ll_stats == NULL)
1297                 GOTO(out, err = -ENOMEM);
1298         /* do counter init */
1299         for (id = 0; id < LPROC_LL_FILE_OPCODES; id++) {
1300                 __u32 type = llite_opcode_table[id].type;
1301                 void *ptr = NULL;
1302                 if (type & LPROCFS_TYPE_REGS)
1303                         ptr = "regs";
1304                 else if (type & LPROCFS_TYPE_BYTES)
1305                         ptr = "bytes";
1306                 else if (type & LPROCFS_TYPE_PAGES)
1307                         ptr = "pages";
1308                 lprocfs_counter_init(sbi->ll_stats,
1309                                      llite_opcode_table[id].opcode,
1310                                      (type & LPROCFS_CNTR_AVGMINMAX),
1311                                      llite_opcode_table[id].opname, ptr);
1312         }
1313         err = lprocfs_register_stats(sbi->ll_proc_root, "stats", sbi->ll_stats);
1314         if (err)
1315                 GOTO(out, err);
1316
1317         sbi->ll_ra_stats = lprocfs_alloc_stats(ARRAY_SIZE(ra_stat_string),
1318                                                LPROCFS_STATS_FLAG_NONE);
1319         if (sbi->ll_ra_stats == NULL)
1320                 GOTO(out, err = -ENOMEM);
1321
1322         for (id = 0; id < ARRAY_SIZE(ra_stat_string); id++)
1323                 lprocfs_counter_init(sbi->ll_ra_stats, id, 0,
1324                                      ra_stat_string[id], "pages");
1325         err = lprocfs_register_stats(sbi->ll_proc_root, "read_ahead_stats",
1326                                      sbi->ll_ra_stats);
1327         if (err)
1328                 GOTO(out, err);
1329
1330
1331         err = lprocfs_add_vars(sbi->ll_proc_root, lprocfs_llite_obd_vars, sb);
1332         if (err)
1333                 GOTO(out, err);
1334
1335 out:
1336         if (err) {
1337                 lprocfs_remove(&sbi->ll_proc_root);
1338                 lprocfs_free_stats(&sbi->ll_ra_stats);
1339                 lprocfs_free_stats(&sbi->ll_stats);
1340         }
1341         RETURN(err);
1342 }
1343
1344 int lprocfs_ll_register_obd(struct super_block *sb, const char *obdname)
1345 {
1346         struct lprocfs_vars lvars[2];
1347         struct ll_sb_info *sbi = ll_s2sbi(sb);
1348         struct obd_device *obd;
1349         struct proc_dir_entry *dir;
1350         char name[MAX_STRING_SIZE + 1];
1351         int err;
1352         ENTRY;
1353
1354         memset(lvars, 0, sizeof(lvars));
1355
1356         name[MAX_STRING_SIZE] = '\0';
1357         lvars[0].name = name;
1358
1359         LASSERT(sbi != NULL);
1360         LASSERT(obdname != NULL);
1361
1362         obd = class_name2obd(obdname);
1363
1364         LASSERT(obd != NULL);
1365         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1366         LASSERT(obd->obd_type->typ_name != NULL);
1367
1368         dir = proc_mkdir(obd->obd_type->typ_name, sbi->ll_proc_root);
1369         if (dir == NULL)
1370                 GOTO(out, err = -ENOMEM);
1371
1372         snprintf(name, MAX_STRING_SIZE, "common_name");
1373         lvars[0].fops = &llite_name_fops;
1374         err = lprocfs_add_vars(dir, lvars, obd);
1375         if (err)
1376                 GOTO(out, err);
1377
1378         snprintf(name, MAX_STRING_SIZE, "uuid");
1379         lvars[0].fops = &llite_uuid_fops;
1380         err = lprocfs_add_vars(dir, lvars, obd);
1381         if (err)
1382                 GOTO(out, err);
1383
1384 out:
1385         if (err) {
1386                 lprocfs_remove(&sbi->ll_proc_root);
1387                 lprocfs_free_stats(&sbi->ll_ra_stats);
1388                 lprocfs_free_stats(&sbi->ll_stats);
1389         }
1390         RETURN(err);
1391 }
1392
1393 void lprocfs_ll_unregister_mountpoint(struct ll_sb_info *sbi)
1394 {
1395         if (sbi->ll_proc_root) {
1396                 lprocfs_remove(&sbi->ll_proc_root);
1397                 lprocfs_free_stats(&sbi->ll_ra_stats);
1398                 lprocfs_free_stats(&sbi->ll_stats);
1399         }
1400 }
1401 #undef MAX_STRING_SIZE
1402
1403 #define pct(a,b) (b ? a * 100 / b : 0)
1404
1405 static void ll_display_extents_info(struct ll_rw_extents_info *io_extents,
1406                                    struct seq_file *seq, int which)
1407 {
1408         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
1409         unsigned long start, end, r, w;
1410         char *unitp = "KMGTPEZY";
1411         int i, units = 10;
1412         struct per_process_info *pp_info = &io_extents->pp_extents[which];
1413
1414         read_cum = 0;
1415         write_cum = 0;
1416         start = 0;
1417
1418         for(i = 0; i < LL_HIST_MAX; i++) {
1419                 read_tot += pp_info->pp_r_hist.oh_buckets[i];
1420                 write_tot += pp_info->pp_w_hist.oh_buckets[i];
1421         }
1422
1423         for(i = 0; i < LL_HIST_MAX; i++) {
1424                 r = pp_info->pp_r_hist.oh_buckets[i];
1425                 w = pp_info->pp_w_hist.oh_buckets[i];
1426                 read_cum += r;
1427                 write_cum += w;
1428                 end = 1 << (i + LL_HIST_START - units);
1429                 seq_printf(seq, "%4lu%c - %4lu%c%c: %14lu %4lu %4lu  | "
1430                            "%14lu %4lu %4lu\n", start, *unitp, end, *unitp,
1431                            (i == LL_HIST_MAX - 1) ? '+' : ' ',
1432                            r, pct(r, read_tot), pct(read_cum, read_tot),
1433                            w, pct(w, write_tot), pct(write_cum, write_tot));
1434                 start = end;
1435                 if (start == 1<<10) {
1436                         start = 1;
1437                         units += 10;
1438                         unitp++;
1439                 }
1440                 if (read_cum == read_tot && write_cum == write_tot)
1441                         break;
1442         }
1443 }
1444
1445 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
1446 {
1447         struct timespec64 now;
1448         struct ll_sb_info *sbi = seq->private;
1449         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1450         int k;
1451
1452         ktime_get_real_ts64(&now);
1453
1454         if (!sbi->ll_rw_stats_on) {
1455                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1456                 return 0;
1457         }
1458         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1459                    (s64)now.tv_sec, now.tv_nsec);
1460         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1461         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1462                    "extents", "calls", "%", "cum%",
1463                    "calls", "%", "cum%");
1464         spin_lock(&sbi->ll_pp_extent_lock);
1465         for (k = 0; k < LL_PROCESS_HIST_MAX; k++) {
1466                 if (io_extents->pp_extents[k].pid != 0) {
1467                         seq_printf(seq, "\nPID: %d\n",
1468                                    io_extents->pp_extents[k].pid);
1469                         ll_display_extents_info(io_extents, seq, k);
1470                 }
1471         }
1472         spin_unlock(&sbi->ll_pp_extent_lock);
1473         return 0;
1474 }
1475
1476 static ssize_t ll_rw_extents_stats_pp_seq_write(struct file *file,
1477                                                 const char __user *buf,
1478                                                 size_t len,
1479                                                 loff_t *off)
1480 {
1481         struct seq_file *seq = file->private_data;
1482         struct ll_sb_info *sbi = seq->private;
1483         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1484         int i;
1485         __s64 value;
1486
1487         if (len == 0)
1488                 return -EINVAL;
1489
1490         value = ll_stats_pid_write(buf, len);
1491
1492         if (value == 0)
1493                 sbi->ll_rw_stats_on = 0;
1494         else
1495                 sbi->ll_rw_stats_on = 1;
1496
1497         spin_lock(&sbi->ll_pp_extent_lock);
1498         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1499                 io_extents->pp_extents[i].pid = 0;
1500                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1501                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1502         }
1503         spin_unlock(&sbi->ll_pp_extent_lock);
1504         return len;
1505 }
1506
1507 LPROC_SEQ_FOPS(ll_rw_extents_stats_pp);
1508
1509 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
1510 {
1511         struct timespec64 now;
1512         struct ll_sb_info *sbi = seq->private;
1513         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1514
1515         ktime_get_real_ts64(&now);
1516
1517         if (!sbi->ll_rw_stats_on) {
1518                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1519                 return 0;
1520         }
1521         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1522                    (s64)now.tv_sec, now.tv_nsec);
1523
1524         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1525         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1526                    "extents", "calls", "%", "cum%",
1527                    "calls", "%", "cum%");
1528         spin_lock(&sbi->ll_lock);
1529         ll_display_extents_info(io_extents, seq, LL_PROCESS_HIST_MAX);
1530         spin_unlock(&sbi->ll_lock);
1531
1532         return 0;
1533 }
1534
1535 static ssize_t ll_rw_extents_stats_seq_write(struct file *file,
1536                                              const char __user *buf,
1537                                              size_t len, loff_t *off)
1538 {
1539         struct seq_file *seq = file->private_data;
1540         struct ll_sb_info *sbi = seq->private;
1541         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1542         int i;
1543         __s64 value;
1544
1545         if (len == 0)
1546                 return -EINVAL;
1547
1548         value = ll_stats_pid_write(buf, len);
1549
1550         if (value == 0)
1551                 sbi->ll_rw_stats_on = 0;
1552         else
1553                 sbi->ll_rw_stats_on = 1;
1554
1555         spin_lock(&sbi->ll_pp_extent_lock);
1556         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
1557                 io_extents->pp_extents[i].pid = 0;
1558                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1559                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1560         }
1561         spin_unlock(&sbi->ll_pp_extent_lock);
1562
1563         return len;
1564 }
1565 LPROC_SEQ_FOPS(ll_rw_extents_stats);
1566
1567 void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
1568                        struct ll_file_data *file, loff_t pos,
1569                        size_t count, int rw)
1570 {
1571         int i, cur = -1;
1572         struct ll_rw_process_info *process;
1573         struct ll_rw_process_info *offset;
1574         int *off_count = &sbi->ll_rw_offset_entry_count;
1575         int *process_count = &sbi->ll_offset_process_count;
1576         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1577
1578         if(!sbi->ll_rw_stats_on)
1579                 return;
1580         process = sbi->ll_rw_process_info;
1581         offset = sbi->ll_rw_offset_info;
1582
1583         spin_lock(&sbi->ll_pp_extent_lock);
1584         /* Extent statistics */
1585         for(i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1586                 if(io_extents->pp_extents[i].pid == pid) {
1587                         cur = i;
1588                         break;
1589                 }
1590         }
1591
1592         if (cur == -1) {
1593                 /* new process */
1594                 sbi->ll_extent_process_count =
1595                         (sbi->ll_extent_process_count + 1) % LL_PROCESS_HIST_MAX;
1596                 cur = sbi->ll_extent_process_count;
1597                 io_extents->pp_extents[cur].pid = pid;
1598                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_r_hist);
1599                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_w_hist);
1600         }
1601
1602         for(i = 0; (count >= (1 << LL_HIST_START << i)) &&
1603              (i < (LL_HIST_MAX - 1)); i++);
1604         if (rw == 0) {
1605                 io_extents->pp_extents[cur].pp_r_hist.oh_buckets[i]++;
1606                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_r_hist.oh_buckets[i]++;
1607         } else {
1608                 io_extents->pp_extents[cur].pp_w_hist.oh_buckets[i]++;
1609                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_w_hist.oh_buckets[i]++;
1610         }
1611         spin_unlock(&sbi->ll_pp_extent_lock);
1612
1613         spin_lock(&sbi->ll_process_lock);
1614         /* Offset statistics */
1615         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1616                 if (process[i].rw_pid == pid) {
1617                         if (process[i].rw_last_file != file) {
1618                                 process[i].rw_range_start = pos;
1619                                 process[i].rw_last_file_pos = pos + count;
1620                                 process[i].rw_smallest_extent = count;
1621                                 process[i].rw_largest_extent = count;
1622                                 process[i].rw_offset = 0;
1623                                 process[i].rw_last_file = file;
1624                                 spin_unlock(&sbi->ll_process_lock);
1625                                 return;
1626                         }
1627                         if (process[i].rw_last_file_pos != pos) {
1628                                 *off_count =
1629                                     (*off_count + 1) % LL_OFFSET_HIST_MAX;
1630                                 offset[*off_count].rw_op = process[i].rw_op;
1631                                 offset[*off_count].rw_pid = pid;
1632                                 offset[*off_count].rw_range_start =
1633                                         process[i].rw_range_start;
1634                                 offset[*off_count].rw_range_end =
1635                                         process[i].rw_last_file_pos;
1636                                 offset[*off_count].rw_smallest_extent =
1637                                         process[i].rw_smallest_extent;
1638                                 offset[*off_count].rw_largest_extent =
1639                                         process[i].rw_largest_extent;
1640                                 offset[*off_count].rw_offset =
1641                                         process[i].rw_offset;
1642                                 process[i].rw_op = rw;
1643                                 process[i].rw_range_start = pos;
1644                                 process[i].rw_smallest_extent = count;
1645                                 process[i].rw_largest_extent = count;
1646                                 process[i].rw_offset = pos -
1647                                         process[i].rw_last_file_pos;
1648                         }
1649                         if(process[i].rw_smallest_extent > count)
1650                                 process[i].rw_smallest_extent = count;
1651                         if(process[i].rw_largest_extent < count)
1652                                 process[i].rw_largest_extent = count;
1653                         process[i].rw_last_file_pos = pos + count;
1654                         spin_unlock(&sbi->ll_process_lock);
1655                         return;
1656                 }
1657         }
1658         *process_count = (*process_count + 1) % LL_PROCESS_HIST_MAX;
1659         process[*process_count].rw_pid = pid;
1660         process[*process_count].rw_op = rw;
1661         process[*process_count].rw_range_start = pos;
1662         process[*process_count].rw_last_file_pos = pos + count;
1663         process[*process_count].rw_smallest_extent = count;
1664         process[*process_count].rw_largest_extent = count;
1665         process[*process_count].rw_offset = 0;
1666         process[*process_count].rw_last_file = file;
1667         spin_unlock(&sbi->ll_process_lock);
1668 }
1669
1670 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
1671 {
1672         struct timespec64 now;
1673         struct ll_sb_info *sbi = seq->private;
1674         struct ll_rw_process_info *offset = sbi->ll_rw_offset_info;
1675         struct ll_rw_process_info *process = sbi->ll_rw_process_info;
1676         int i;
1677
1678         ktime_get_real_ts64(&now);
1679
1680         if (!sbi->ll_rw_stats_on) {
1681                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1682                 return 0;
1683         }
1684         spin_lock(&sbi->ll_process_lock);
1685
1686         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1687                    (s64)now.tv_sec, now.tv_nsec);
1688         seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
1689                    "R/W", "PID", "RANGE START", "RANGE END",
1690                    "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");
1691
1692         /* We stored the discontiguous offsets here; print them first */
1693         for (i = 0; i < LL_OFFSET_HIST_MAX; i++) {
1694                 if (offset[i].rw_pid != 0)
1695                         seq_printf(seq,
1696                                    "%3c %10d %14Lu %14Lu %17lu %17lu %14Lu",
1697                                    offset[i].rw_op == READ ? 'R' : 'W',
1698                                    offset[i].rw_pid,
1699                                    offset[i].rw_range_start,
1700                                    offset[i].rw_range_end,
1701                                    (unsigned long)offset[i].rw_smallest_extent,
1702                                    (unsigned long)offset[i].rw_largest_extent,
1703                                    offset[i].rw_offset);
1704         }
1705
1706         /* Then print the current offsets for each process */
1707         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1708                 if (process[i].rw_pid != 0)
1709                         seq_printf(seq,
1710                                    "%3c %10d %14Lu %14Lu %17lu %17lu %14Lu",
1711                                    process[i].rw_op == READ ? 'R' : 'W',
1712                                    process[i].rw_pid,
1713                                    process[i].rw_range_start,
1714                                    process[i].rw_last_file_pos,
1715                                    (unsigned long)process[i].rw_smallest_extent,
1716                                    (unsigned long)process[i].rw_largest_extent,
1717                                    process[i].rw_offset);
1718         }
1719         spin_unlock(&sbi->ll_process_lock);
1720
1721         return 0;
1722 }
1723
1724 static ssize_t ll_rw_offset_stats_seq_write(struct file *file,
1725                                             const char __user *buf,
1726                                             size_t len, loff_t *off)
1727 {
1728         struct seq_file *seq = file->private_data;
1729         struct ll_sb_info *sbi = seq->private;
1730         struct ll_rw_process_info *process_info = sbi->ll_rw_process_info;
1731         struct ll_rw_process_info *offset_info = sbi->ll_rw_offset_info;
1732         __s64 value;
1733
1734         if (len == 0)
1735                 return -EINVAL;
1736
1737         value = ll_stats_pid_write(buf, len);
1738
1739         if (value == 0)
1740                 sbi->ll_rw_stats_on = 0;
1741         else
1742                 sbi->ll_rw_stats_on = 1;
1743
1744         spin_lock(&sbi->ll_process_lock);
1745         sbi->ll_offset_process_count = 0;
1746         sbi->ll_rw_offset_entry_count = 0;
1747         memset(process_info, 0, sizeof(struct ll_rw_process_info) *
1748                LL_PROCESS_HIST_MAX);
1749         memset(offset_info, 0, sizeof(struct ll_rw_process_info) *
1750                LL_OFFSET_HIST_MAX);
1751         spin_unlock(&sbi->ll_process_lock);
1752
1753         return len;
1754 }
1755
1756 /**
1757  * ll_stats_pid_write() - Determine if stats collection should be enabled
1758  * @buf: Buffer containing the data written
1759  * @len: Number of bytes in the buffer
1760  *
1761  * Several proc files begin collecting stats when a value is written, and stop
1762  * collecting when either '0' or 'disable' is written. This function checks the
1763  * written value to see if collection should be enabled or disabled.
1764  *
1765  * Return: If '0' or 'disable' is provided, 0 is returned. If the text
1766  * equivalent of a number is written, that number is returned. Otherwise,
1767  * 1 is returned. Non-zero return values indicate collection should be enabled.
1768  */
1769 static __s64 ll_stats_pid_write(const char __user *buf, size_t len)
1770 {
1771         __s64 value = 1;
1772         int rc;
1773         char kernbuf[16];
1774
1775         rc = lprocfs_str_to_s64(buf, len, &value);
1776
1777         if (rc < 0 && len < sizeof(kernbuf)) {
1778
1779                 if (copy_from_user(kernbuf, buf, len))
1780                         return -EFAULT;
1781                 kernbuf[len] = 0;
1782
1783                 if (kernbuf[len - 1] == '\n')
1784                         kernbuf[len - 1] = 0;
1785
1786                 if (strncasecmp(kernbuf, "disable", 7) == 0)
1787                         value = 0;
1788         }
1789
1790         return value;
1791 }
1792
1793 LPROC_SEQ_FOPS(ll_rw_offset_stats);
1794 #endif /* CONFIG_PROC_FS */