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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, 2015, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36 #define DEBUG_SUBSYSTEM S_LLITE
  37
  38 #include <linux/version.h>
  39 #include <linux/user_namespace.h>
  40 #ifdef HAVE_UIDGID_HEADER
  41 # include <linux/uidgid.h>
  42 #endif
  43 #include <lustre_param.h>
  44 #include <lprocfs_status.h>
  45 #include <obd_support.h>
  46
  47 #include "llite_internal.h"
  48 #include "vvp_internal.h"
  49
  50 struct proc_dir_entry *proc_lustre_fs_root;
  51
  52 #ifdef CONFIG_PROC_FS
  53 /* /proc/lustre/llite mount point registration */
  54 static const struct file_operations ll_rw_extents_stats_fops;
  55 static const struct file_operations ll_rw_extents_stats_pp_fops;
  56 static const struct file_operations ll_rw_offset_stats_fops;
  57
  58 static int ll_blksize_seq_show(struct seq_file *m, void *v)
  59 {
  60         struct super_block *sb = m->private;
  61         struct obd_statfs osfs;
  62         int rc;
  63
  64         LASSERT(sb != NULL);
  65         rc = ll_statfs_internal(sb, &osfs,
  66                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
  67                                 OBD_STATFS_NODELAY);
  68         if (!rc)
  69                 seq_printf(m, "%u\n", osfs.os_bsize);
  70         return rc;
  71 }
  72 LPROC_SEQ_FOPS_RO(ll_blksize);
  73
  74 static int ll_kbytestotal_seq_show(struct seq_file *m, void *v)
  75 {
  76         struct super_block *sb = m->private;
  77         struct obd_statfs osfs;
  78         int rc;
  79
  80         LASSERT(sb != NULL);
  81         rc = ll_statfs_internal(sb, &osfs,
  82                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
  83                                 OBD_STATFS_NODELAY);
  84         if (!rc) {
  85                 __u32 blk_size = osfs.os_bsize >> 10;
  86                 __u64 result = osfs.os_blocks;
  87
  88                 while (blk_size >>= 1)
  89                         result <<= 1;
  90
  91                 seq_printf(m, LPU64"\n", result);
  92         }
  93         return rc;
  94 }
  95 LPROC_SEQ_FOPS_RO(ll_kbytestotal);
  96
  97 static int ll_kbytesfree_seq_show(struct seq_file *m, void *v)
  98 {
  99         struct super_block *sb = m->private;
 100         struct obd_statfs osfs;
 101         int rc;
 102
 103         LASSERT(sb != NULL);
 104         rc = ll_statfs_internal(sb, &osfs,
 105                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 106                                 OBD_STATFS_NODELAY);
 107         if (!rc) {
 108                 __u32 blk_size = osfs.os_bsize >> 10;
 109                 __u64 result = osfs.os_bfree;
 110
 111                 while (blk_size >>= 1)
 112                         result <<= 1;
 113
 114                 seq_printf(m, LPU64"\n", result);
 115         }
 116         return rc;
 117 }
 118 LPROC_SEQ_FOPS_RO(ll_kbytesfree);
 119
 120 static int ll_kbytesavail_seq_show(struct seq_file *m, void *v)
 121 {
 122         struct super_block *sb = m->private;
 123         struct obd_statfs osfs;
 124         int rc;
 125
 126         LASSERT(sb != NULL);
 127         rc = ll_statfs_internal(sb, &osfs,
 128                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 129                                 OBD_STATFS_NODELAY);
 130         if (!rc) {
 131                 __u32 blk_size = osfs.os_bsize >> 10;
 132                 __u64 result = osfs.os_bavail;
 133
 134                 while (blk_size >>= 1)
 135                         result <<= 1;
 136
 137                 seq_printf(m, LPU64"\n", result);
 138         }
 139         return rc;
 140 }
 141 LPROC_SEQ_FOPS_RO(ll_kbytesavail);
 142
 143 static int ll_filestotal_seq_show(struct seq_file *m, void *v)
 144 {
 145         struct super_block *sb = m->private;
 146         struct obd_statfs osfs;
 147         int rc;
 148
 149         LASSERT(sb != NULL);
 150         rc = ll_statfs_internal(sb, &osfs,
 151                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 152                                 OBD_STATFS_NODELAY);
 153         if (!rc)
 154                 seq_printf(m, LPU64"\n", osfs.os_files);
 155         return rc;
 156 }
 157 LPROC_SEQ_FOPS_RO(ll_filestotal);
 158
 159 static int ll_filesfree_seq_show(struct seq_file *m, void *v)
 160 {
 161         struct super_block *sb = m->private;
 162         struct obd_statfs osfs;
 163         int rc;
 164
 165         LASSERT(sb != NULL);
 166         rc = ll_statfs_internal(sb, &osfs,
 167                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 168                                 OBD_STATFS_NODELAY);
 169         if (!rc)
 170                 seq_printf(m, LPU64"\n", osfs.os_ffree);
 171         return rc;
 172 }
 173 LPROC_SEQ_FOPS_RO(ll_filesfree);
 174
 175 static int ll_client_type_seq_show(struct seq_file *m, void *v)
 176 {
 177         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 178
 179         LASSERT(sbi != NULL);
 180
 181         if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
 182                 seq_puts(m, "remote client\n");
 183         else
 184                 seq_puts(m, "local client\n");
 185         return 0;
 186 }
 187 LPROC_SEQ_FOPS_RO(ll_client_type);
 188
 189 static int ll_fstype_seq_show(struct seq_file *m, void *v)
 190 {
 191         struct super_block *sb = m->private;
 192
 193         LASSERT(sb != NULL);
 194         seq_printf(m, "%s\n", sb->s_type->name);
 195         return 0;
 196 }
 197 LPROC_SEQ_FOPS_RO(ll_fstype);
 198
 199 static int ll_sb_uuid_seq_show(struct seq_file *m, void *v)
 200 {
 201         struct super_block *sb = m->private;
 202
 203         LASSERT(sb != NULL);
 204         seq_printf(m, "%s\n", ll_s2sbi(sb)->ll_sb_uuid.uuid);
 205         return 0;
 206 }
 207 LPROC_SEQ_FOPS_RO(ll_sb_uuid);
 208
 209 static int ll_xattr_cache_seq_show(struct seq_file *m, void *v)
 210 {
 211         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 212
 213         seq_printf(m, "%u\n", sbi->ll_xattr_cache_enabled);
 214         return 0;
 215 }
 216
 217 static ssize_t ll_xattr_cache_seq_write(struct file *file,
 218                                         const char __user *buffer,
 219                                         size_t count, loff_t *off)
 220 {
 221         struct seq_file *m = file->private_data;
 222         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 223         __s64 val;
 224         int rc;
 225
 226         rc = lprocfs_str_to_s64(buffer, count, &val);
 227         if (rc)
 228                 return rc;
 229
 230         if (val != 0 && val != 1)
 231                 return -ERANGE;
 232
 233         if (val == 1 && !(sbi->ll_flags & LL_SBI_XATTR_CACHE))
 234                 return -ENOTSUPP;
 235
 236         sbi->ll_xattr_cache_enabled = val;
 237
 238         return count;
 239 }
 240 LPROC_SEQ_FOPS(ll_xattr_cache);
 241
 242 static int ll_site_stats_seq_show(struct seq_file *m, void *v)
 243 {
 244         struct super_block *sb = m->private;
 245
 246         /*
 247          * See description of statistical counters in struct cl_site, and
 248          * struct lu_site.
 249          */
 250         return cl_site_stats_print(lu2cl_site(ll_s2sbi(sb)->ll_site), m);
 251 }
 252 LPROC_SEQ_FOPS_RO(ll_site_stats);
 253
 254 static int ll_max_readahead_mb_seq_show(struct seq_file *m, void *v)
 255 {
 256         struct super_block *sb = m->private;
 257         struct ll_sb_info *sbi = ll_s2sbi(sb);
 258         long pages_number;
 259         int mult;
 260
 261         spin_lock(&sbi->ll_lock);
 262         pages_number = sbi->ll_ra_info.ra_max_pages;
 263         spin_unlock(&sbi->ll_lock);
 264
 265         mult = 1 << (20 - PAGE_CACHE_SHIFT);
 266         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 267 }
 268
 269 static ssize_t
 270 ll_max_readahead_mb_seq_write(struct file *file, const char __user *buffer,
 271                               size_t count, loff_t *off)
 272 {
 273         struct seq_file *m = file->private_data;
 274         struct super_block *sb = m->private;
 275         struct ll_sb_info *sbi = ll_s2sbi(sb);
 276         __s64 pages_number;
 277         int rc;
 278
 279         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 280         if (rc)
 281                 return rc;
 282
 283         pages_number >>= PAGE_CACHE_SHIFT;
 284
 285         if (pages_number < 0 || pages_number > totalram_pages / 2) {
 286                 /* 1/2 of RAM */
 287                 CERROR("%s: can't set max_readahead_mb=%lu > %luMB\n",
 288                        ll_get_fsname(sb, NULL, 0),
 289                        (unsigned long)pages_number >> (20 - PAGE_CACHE_SHIFT),
 290                        totalram_pages >> (20 - PAGE_CACHE_SHIFT + 1));
 291                 return -ERANGE;
 292         }
 293
 294         spin_lock(&sbi->ll_lock);
 295         sbi->ll_ra_info.ra_max_pages = pages_number;
 296         spin_unlock(&sbi->ll_lock);
 297         return count;
 298 }
 299 LPROC_SEQ_FOPS(ll_max_readahead_mb);
 300
 301 static int ll_max_readahead_per_file_mb_seq_show(struct seq_file *m, void *v)
 302 {
 303         struct super_block *sb = m->private;
 304         struct ll_sb_info *sbi = ll_s2sbi(sb);
 305         long pages_number;
 306         int mult;
 307
 308         spin_lock(&sbi->ll_lock);
 309         pages_number = sbi->ll_ra_info.ra_max_pages_per_file;
 310         spin_unlock(&sbi->ll_lock);
 311
 312         mult = 1 << (20 - PAGE_CACHE_SHIFT);
 313         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 314 }
 315
 316 static ssize_t
 317 ll_max_readahead_per_file_mb_seq_write(struct file *file,
 318                                        const char __user *buffer,
 319                                        size_t count, loff_t *off)
 320 {
 321         struct seq_file *m = file->private_data;
 322         struct super_block *sb = m->private;
 323         struct ll_sb_info *sbi = ll_s2sbi(sb);
 324         int rc;
 325         __s64 pages_number;
 326
 327         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 328         if (rc)
 329                 return rc;
 330
 331         pages_number >>= PAGE_CACHE_SHIFT;
 332
 333         if (pages_number < 0 || pages_number > sbi->ll_ra_info.ra_max_pages) {
 334                 CERROR("%s: can't set max_readahead_per_file_mb=%lu > "
 335                        "max_read_ahead_mb=%lu\n", ll_get_fsname(sb, NULL, 0),
 336                        (unsigned long)pages_number >> (20 - PAGE_CACHE_SHIFT),
 337                        sbi->ll_ra_info.ra_max_pages >> (20 - PAGE_CACHE_SHIFT));
 338                 return -ERANGE;
 339         }
 340
 341         spin_lock(&sbi->ll_lock);
 342         sbi->ll_ra_info.ra_max_pages_per_file = pages_number;
 343         spin_unlock(&sbi->ll_lock);
 344         return count;
 345 }
 346 LPROC_SEQ_FOPS(ll_max_readahead_per_file_mb);
 347
 348 static int ll_max_read_ahead_whole_mb_seq_show(struct seq_file *m, void *v)
 349 {
 350         struct super_block *sb = m->private;
 351         struct ll_sb_info *sbi = ll_s2sbi(sb);
 352         long pages_number;
 353         int mult;
 354
 355         spin_lock(&sbi->ll_lock);
 356         pages_number = sbi->ll_ra_info.ra_max_read_ahead_whole_pages;
 357         spin_unlock(&sbi->ll_lock);
 358
 359         mult = 1 << (20 - PAGE_CACHE_SHIFT);
 360         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 361 }
 362
 363 static ssize_t
 364 ll_max_read_ahead_whole_mb_seq_write(struct file *file,
 365                                      const char __user *buffer,
 366                                      size_t count, loff_t *off)
 367 {
 368         struct seq_file *m = file->private_data;
 369         struct super_block *sb = m->private;
 370         struct ll_sb_info *sbi = ll_s2sbi(sb);
 371         int rc;
 372         __s64 pages_number;
 373
 374         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 375         if (rc)
 376                 return rc;
 377
 378         pages_number >>= PAGE_CACHE_SHIFT;
 379
 380         /* Cap this at the current max readahead window size, the readahead
 381          * algorithm does this anyway so it's pointless to set it larger. */
 382         if (pages_number < 0 ||
 383             pages_number > sbi->ll_ra_info.ra_max_pages_per_file) {
 384                 int pages_shift = 20 - PAGE_CACHE_SHIFT;
 385                 CERROR("%s: can't set max_read_ahead_whole_mb=%lu > "
 386                        "max_read_ahead_per_file_mb=%lu\n",
 387                        ll_get_fsname(sb, NULL, 0),
 388                        (unsigned long)pages_number >> pages_shift,
 389                        sbi->ll_ra_info.ra_max_pages_per_file >> pages_shift);
 390                 return -ERANGE;
 391         }
 392
 393         spin_lock(&sbi->ll_lock);
 394         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = pages_number;
 395         spin_unlock(&sbi->ll_lock);
 396         return count;
 397 }
 398 LPROC_SEQ_FOPS(ll_max_read_ahead_whole_mb);
 399
 400 static int ll_max_cached_mb_seq_show(struct seq_file *m, void *v)
 401 {
 402         struct super_block     *sb    = m->private;
 403         struct ll_sb_info      *sbi   = ll_s2sbi(sb);
 404         struct cl_client_cache *cache = sbi->ll_cache;
 405         int shift = 20 - PAGE_CACHE_SHIFT;
 406         long max_cached_mb;
 407         long unused_mb;
 408
 409         max_cached_mb = cache->ccc_lru_max >> shift;
 410         unused_mb = atomic_long_read(&cache->ccc_lru_left) >> shift;
 411         seq_printf(m, "users: %d\n"
 412                    "max_cached_mb: %ld\n"
 413                    "used_mb: %ld\n"
 414                    "unused_mb: %ld\n"
 415                    "reclaim_count: %u\n",
 416                    atomic_read(&cache->ccc_users),
 417                    max_cached_mb,
 418                    max_cached_mb - unused_mb,
 419                    unused_mb,
 420                    cache->ccc_lru_shrinkers);
 421         return 0;
 422 }
 423
 424 static ssize_t
 425 ll_max_cached_mb_seq_write(struct file *file, const char __user *buffer,
 426                            size_t count, loff_t *off)
 427 {
 428         struct seq_file *m = file->private_data;
 429         struct super_block *sb = m->private;
 430         struct ll_sb_info *sbi = ll_s2sbi(sb);
 431         struct cl_client_cache *cache = sbi->ll_cache;
 432         struct lu_env *env;
 433         long diff = 0;
 434         long nrpages = 0;
 435         __u16 refcheck;
 436         __s64 pages_number;
 437         long rc;
 438         char kernbuf[128];
 439         ENTRY;
 440
 441         if (count >= sizeof(kernbuf))
 442                 RETURN(-EINVAL);
 443
 444         if (copy_from_user(kernbuf, buffer, count))
 445                 RETURN(-EFAULT);
 446         kernbuf[count] = 0;
 447
 448         buffer += lprocfs_find_named_value(kernbuf, "max_cached_mb:", &count) -
 449                   kernbuf;
 450         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 451         if (rc)
 452                 RETURN(rc);
 453
 454         pages_number >>= PAGE_CACHE_SHIFT;
 455
 456         if (pages_number < 0 || pages_number > totalram_pages) {
 457                 CERROR("%s: can't set max cache more than %lu MB\n",
 458                        ll_get_fsname(sb, NULL, 0),
 459                        totalram_pages >> (20 - PAGE_CACHE_SHIFT));
 460                 RETURN(-ERANGE);
 461         }
 462         /* Allow enough cache so clients can make well-formed RPCs */
 463         pages_number = max_t(long, pages_number, PTLRPC_MAX_BRW_PAGES);
 464
 465         spin_lock(&sbi->ll_lock);
 466         diff = pages_number - cache->ccc_lru_max;
 467         spin_unlock(&sbi->ll_lock);
 468
 469         /* easy - add more LRU slots. */
 470         if (diff >= 0) {
 471                 atomic_long_add(diff, &cache->ccc_lru_left);
 472                 GOTO(out, rc = 0);
 473         }
 474
 475         env = cl_env_get(&refcheck);
 476         if (IS_ERR(env))
 477                 RETURN(rc);
 478
 479         diff = -diff;
 480         while (diff > 0) {
 481                 long tmp;
 482
 483                 /* reduce LRU budget from free slots. */
 484                 do {
 485                         long ov, nv;
 486
 487                         ov = atomic_long_read(&cache->ccc_lru_left);
 488                         if (ov == 0)
 489                                 break;
 490
 491                         nv = ov > diff ? ov - diff : 0;
 492                         rc = atomic_long_cmpxchg(&cache->ccc_lru_left, ov, nv);
 493                         if (likely(ov == rc)) {
 494                                 diff -= ov - nv;
 495                                 nrpages += ov - nv;
 496                                 break;
 497                         }
 498                 } while (1);
 499
 500                 if (diff <= 0)
 501                         break;
 502
 503                 if (sbi->ll_dt_exp == NULL) { /* being initialized */
 504                         rc = -ENODEV;
 505                         break;
 506                 }
 507
 508                 /* difficult - have to ask OSCs to drop LRU slots. */
 509                 tmp = diff << 1;
 510                 rc = obd_set_info_async(env, sbi->ll_dt_exp,
 511                                 sizeof(KEY_CACHE_LRU_SHRINK),
 512                                 KEY_CACHE_LRU_SHRINK,
 513                                 sizeof(tmp), &tmp, NULL);
 514                 if (rc < 0)
 515                         break;
 516         }
 517         cl_env_put(env, &refcheck);
 518
 519 out:
 520         if (rc >= 0) {
 521                 spin_lock(&sbi->ll_lock);
 522                 cache->ccc_lru_max = pages_number;
 523                 spin_unlock(&sbi->ll_lock);
 524                 rc = count;
 525         } else {
 526                 atomic_long_add(nrpages, &cache->ccc_lru_left);
 527         }
 528         return rc;
 529 }
 530 LPROC_SEQ_FOPS(ll_max_cached_mb);
 531
 532 static int ll_checksum_seq_show(struct seq_file *m, void *v)
 533 {
 534         struct super_block *sb = m->private;
 535         struct ll_sb_info *sbi = ll_s2sbi(sb);
 536
 537         seq_printf(m, "%u\n", (sbi->ll_flags & LL_SBI_CHECKSUM) ? 1 : 0);
 538         return 0;
 539 }
 540
 541 static ssize_t ll_checksum_seq_write(struct file *file,
 542                                      const char __user *buffer,
 543                                      size_t count, loff_t *off)
 544 {
 545         struct seq_file *m = file->private_data;
 546         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 547         int rc;
 548         __s64 val;
 549
 550         if (!sbi->ll_dt_exp)
 551                 /* Not set up yet */
 552                 return -EAGAIN;
 553
 554         rc = lprocfs_str_to_s64(buffer, count, &val);
 555         if (rc)
 556                 return rc;
 557         if (val)
 558                 sbi->ll_flags |= LL_SBI_CHECKSUM;
 559         else
 560                 sbi->ll_flags &= ~LL_SBI_CHECKSUM;
 561
 562         rc = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 563                                 KEY_CHECKSUM, sizeof(val), &val, NULL);
 564         if (rc)
 565                 CWARN("Failed to set OSC checksum flags: %d\n", rc);
 566
 567         return count;
 568 }
 569 LPROC_SEQ_FOPS(ll_checksum);
 570
 571 static int ll_rd_track_id(struct seq_file *m, enum stats_track_type type)
 572 {
 573         struct super_block *sb = m->private;
 574
 575         if (ll_s2sbi(sb)->ll_stats_track_type == type) {
 576                 seq_printf(m, "%d\n",
 577                            ll_s2sbi(sb)->ll_stats_track_id);
 578         } else if (ll_s2sbi(sb)->ll_stats_track_type == STATS_TRACK_ALL) {
 579                 seq_puts(m, "0 (all)\n");
 580         } else {
 581                 seq_puts(m, "untracked\n");
 582         }
 583         return 0;
 584 }
 585
 586 static int ll_wr_track_id(const char __user *buffer, unsigned long count,
 587                           void *data, enum stats_track_type type)
 588 {
 589         struct super_block *sb = data;
 590         int rc;
 591         __s64 pid;
 592
 593         rc = lprocfs_str_to_s64(buffer, count, &pid);
 594         if (rc)
 595                 return rc;
 596         if (pid > INT_MAX || pid < 0)
 597                 return -ERANGE;
 598
 599         ll_s2sbi(sb)->ll_stats_track_id = pid;
 600         if (pid == 0)
 601                 ll_s2sbi(sb)->ll_stats_track_type = STATS_TRACK_ALL;
 602         else
 603                 ll_s2sbi(sb)->ll_stats_track_type = type;
 604         lprocfs_clear_stats(ll_s2sbi(sb)->ll_stats);
 605         return count;
 606 }
 607
 608 static int ll_track_pid_seq_show(struct seq_file *m, void *v)
 609 {
 610         return ll_rd_track_id(m, STATS_TRACK_PID);
 611 }
 612
 613 static ssize_t ll_track_pid_seq_write(struct file *file,
 614                                       const char __user *buffer,
 615                                       size_t count, loff_t *off)
 616 {
 617         struct seq_file *seq = file->private_data;
 618         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PID);
 619 }
 620 LPROC_SEQ_FOPS(ll_track_pid);
 621
 622 static int ll_track_ppid_seq_show(struct seq_file *m, void *v)
 623 {
 624         return ll_rd_track_id(m, STATS_TRACK_PPID);
 625 }
 626
 627 static ssize_t ll_track_ppid_seq_write(struct file *file,
 628                                        const char __user *buffer,
 629                                        size_t count, loff_t *off)
 630 {
 631         struct seq_file *seq = file->private_data;
 632         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PPID);
 633 }
 634 LPROC_SEQ_FOPS(ll_track_ppid);
 635
 636 static int ll_track_gid_seq_show(struct seq_file *m, void *v)
 637 {
 638         return ll_rd_track_id(m, STATS_TRACK_GID);
 639 }
 640
 641 static ssize_t ll_track_gid_seq_write(struct file *file,
 642                                       const char __user *buffer,
 643                                       size_t count, loff_t *off)
 644 {
 645         struct seq_file *seq = file->private_data;
 646         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_GID);
 647 }
 648 LPROC_SEQ_FOPS(ll_track_gid);
 649
 650 static int ll_statahead_max_seq_show(struct seq_file *m, void *v)
 651 {
 652         struct super_block *sb = m->private;
 653         struct ll_sb_info *sbi = ll_s2sbi(sb);
 654
 655         seq_printf(m, "%u\n", sbi->ll_sa_max);
 656         return 0;
 657 }
 658
 659 static ssize_t ll_statahead_max_seq_write(struct file *file,
 660                                           const char __user *buffer,
 661                                           size_t count, loff_t *off)
 662 {
 663         struct seq_file *m = file->private_data;
 664         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 665         int rc;
 666         __s64 val;
 667
 668         rc = lprocfs_str_to_s64(buffer, count, &val);
 669         if (rc)
 670                 return rc;
 671
 672         if (val >= 0 && val <= LL_SA_RPC_MAX)
 673                 sbi->ll_sa_max = val;
 674         else
 675                 CERROR("Bad statahead_max value "LPD64". Valid values are in "
 676                        "the range [0, %d]\n", val, LL_SA_RPC_MAX);
 677
 678         return count;
 679 }
 680 LPROC_SEQ_FOPS(ll_statahead_max);
 681
 682 static int ll_statahead_agl_seq_show(struct seq_file *m, void *v)
 683 {
 684         struct super_block *sb = m->private;
 685         struct ll_sb_info *sbi = ll_s2sbi(sb);
 686
 687         seq_printf(m, "%u\n",
 688                    sbi->ll_flags & LL_SBI_AGL_ENABLED ? 1 : 0);
 689         return 0;
 690 }
 691
 692 static ssize_t ll_statahead_agl_seq_write(struct file *file,
 693                                           const char __user *buffer,
 694                                           size_t count, loff_t *off)
 695 {
 696         struct seq_file *m = file->private_data;
 697         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 698         int rc;
 699         __s64 val;
 700
 701         rc = lprocfs_str_to_s64(buffer, count, &val);
 702         if (rc)
 703                 return rc;
 704
 705         if (val)
 706                 sbi->ll_flags |= LL_SBI_AGL_ENABLED;
 707         else
 708                 sbi->ll_flags &= ~LL_SBI_AGL_ENABLED;
 709
 710         return count;
 711 }
 712 LPROC_SEQ_FOPS(ll_statahead_agl);
 713
 714 static int ll_statahead_stats_seq_show(struct seq_file *m, void *v)
 715 {
 716         struct super_block *sb = m->private;
 717         struct ll_sb_info *sbi = ll_s2sbi(sb);
 718
 719         seq_printf(m, "statahead total: %u\n"
 720                     "statahead wrong: %u\n"
 721                     "agl total: %u\n",
 722                     atomic_read(&sbi->ll_sa_total),
 723                     atomic_read(&sbi->ll_sa_wrong),
 724                     atomic_read(&sbi->ll_agl_total));
 725         return 0;
 726 }
 727 LPROC_SEQ_FOPS_RO(ll_statahead_stats);
 728
 729 static int ll_lazystatfs_seq_show(struct seq_file *m, void *v)
 730 {
 731         struct super_block *sb = m->private;
 732         struct ll_sb_info *sbi = ll_s2sbi(sb);
 733
 734         seq_printf(m, "%u\n",
 735                    (sbi->ll_flags & LL_SBI_LAZYSTATFS) ? 1 : 0);
 736         return 0;
 737 }
 738
 739 static ssize_t ll_lazystatfs_seq_write(struct file *file,
 740                                        const char __user *buffer,
 741                                         size_t count, loff_t *off)
 742 {
 743         struct seq_file *m = file->private_data;
 744         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 745         int rc;
 746         __s64 val;
 747
 748         rc = lprocfs_str_to_s64(buffer, count, &val);
 749         if (rc)
 750                 return rc;
 751
 752         if (val)
 753                 sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 754         else
 755                 sbi->ll_flags &= ~LL_SBI_LAZYSTATFS;
 756
 757         return count;
 758 }
 759 LPROC_SEQ_FOPS(ll_lazystatfs);
 760
 761 static int ll_max_easize_seq_show(struct seq_file *m, void *v)
 762 {
 763         struct super_block *sb = m->private;
 764         struct ll_sb_info *sbi = ll_s2sbi(sb);
 765         unsigned int ealen;
 766         int rc;
 767
 768         rc = ll_get_max_mdsize(sbi, &ealen);
 769         if (rc)
 770                 return rc;
 771
 772         seq_printf(m, "%u\n", ealen);
 773         return 0;
 774 }
 775 LPROC_SEQ_FOPS_RO(ll_max_easize);
 776
 777 /**
 778  * Get default_easize.
 779  *
 780  * \see client_obd::cl_default_mds_easize
 781  *
 782  * \param[in] m         seq_file handle
 783  * \param[in] v         unused for single entry
 784  *
 785  * \retval 0            on success
 786  * \retval negative     negated errno on failure
 787  */
 788 static int ll_default_easize_seq_show(struct seq_file *m, void *v)
 789 {
 790         struct super_block *sb = m->private;
 791         struct ll_sb_info *sbi = ll_s2sbi(sb);
 792         unsigned int ealen;
 793         int rc;
 794
 795         rc = ll_get_default_mdsize(sbi, &ealen);
 796         if (rc)
 797                 return rc;
 798
 799         seq_printf(m, "%u\n", ealen);
 800         return 0;
 801 }
 802
 803 /**
 804  * Set default_easize.
 805  *
 806  * Range checking on the passed value is handled by
 807  * ll_set_default_mdsize().
 808  *
 809  * \see client_obd::cl_default_mds_easize
 810  *
 811  * \param[in] file      proc file
 812  * \param[in] buffer    string passed from user space
 813  * \param[in] count     \a buffer length
 814  * \param[in] off       unused for single entry
 815  *
 816  * \retval positive     \a count on success
 817  * \retval negative     negated errno on failure
 818  */
 819 static ssize_t ll_default_easize_seq_write(struct file *file,
 820                                            const char __user *buffer,
 821                                            size_t count, loff_t *unused)
 822 {
 823         struct seq_file *seq = file->private_data;
 824         struct super_block *sb = (struct super_block *)seq->private;
 825         struct ll_sb_info *sbi = ll_s2sbi(sb);
 826         __s64 val;
 827         int rc;
 828
 829         if (count == 0)
 830                 return 0;
 831
 832         rc = lprocfs_str_to_s64(buffer, count, &val);
 833         if (rc)
 834                 return rc;
 835         if (val < 0 || val > INT_MAX)
 836                 return -ERANGE;
 837
 838         rc = ll_set_default_mdsize(sbi, val);
 839         if (rc)
 840                 return rc;
 841
 842         return count;
 843 }
 844 LPROC_SEQ_FOPS(ll_default_easize);
 845
 846 static int ll_sbi_flags_seq_show(struct seq_file *m, void *v)
 847 {
 848         const char *str[] = LL_SBI_FLAGS;
 849         struct super_block *sb = m->private;
 850         int flags = ll_s2sbi(sb)->ll_flags;
 851         int i = 0;
 852
 853         while (flags != 0) {
 854                 if (ARRAY_SIZE(str) <= i) {
 855                         CERROR("%s: Revise array LL_SBI_FLAGS to match sbi "
 856                                 "flags please.\n", ll_get_fsname(sb, NULL, 0));
 857                         return -EINVAL;
 858                 }
 859
 860                 if (flags & 0x1)
 861                         seq_printf(m, "%s ", str[i]);
 862                 flags >>= 1;
 863                 ++i;
 864         }
 865         seq_printf(m, "\b\n");
 866         return 0;
 867 }
 868 LPROC_SEQ_FOPS_RO(ll_sbi_flags);
 869
 870 static int ll_fast_read_seq_show(struct seq_file *m, void *v)
 871 {
 872         struct super_block *sb = m->private;
 873         struct ll_sb_info *sbi = ll_s2sbi(sb);
 874
 875         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_FAST_READ));
 876         return 0;
 877 }
 878
 879 static ssize_t
 880 ll_fast_read_seq_write(struct file *file, const char __user *buffer,
 881                        size_t count, loff_t *off)
 882 {
 883         struct seq_file *m = file->private_data;
 884         struct super_block *sb = m->private;
 885         struct ll_sb_info *sbi = ll_s2sbi(sb);
 886         int rc;
 887         __s64 val;
 888
 889         rc = lprocfs_str_to_s64(buffer, count, &val);
 890         if (rc)
 891                 return rc;
 892
 893         spin_lock(&sbi->ll_lock);
 894         if (val == 1)
 895                 sbi->ll_flags |= LL_SBI_FAST_READ;
 896         else
 897                 sbi->ll_flags &= ~LL_SBI_FAST_READ;
 898         spin_unlock(&sbi->ll_lock);
 899
 900         return count;
 901 }
 902 LPROC_SEQ_FOPS(ll_fast_read);
 903
 904 static int ll_unstable_stats_seq_show(struct seq_file *m, void *v)
 905 {
 906         struct super_block      *sb    = m->private;
 907         struct ll_sb_info       *sbi   = ll_s2sbi(sb);
 908         struct cl_client_cache  *cache = sbi->ll_cache;
 909         long pages;
 910         int mb;
 911
 912         pages = atomic_long_read(&cache->ccc_unstable_nr);
 913         mb    = (pages * PAGE_CACHE_SIZE) >> 20;
 914
 915         seq_printf(m, "unstable_check:     %8d\n"
 916                    "unstable_pages: %12ld\n"
 917                    "unstable_mb:        %8d\n",
 918                    cache->ccc_unstable_check, pages, mb);
 919         return 0;
 920 }
 921
 922 static ssize_t ll_unstable_stats_seq_write(struct file *file,
 923                                            const char __user *buffer,
 924                                            size_t count, loff_t *unused)
 925 {
 926         struct seq_file *seq = file->private_data;
 927         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)seq->private);
 928         char kernbuf[128];
 929         int rc;
 930         __s64 val;
 931
 932         if (count == 0)
 933                 return 0;
 934         if (count >= sizeof(kernbuf))
 935                 return -EINVAL;
 936
 937         if (copy_from_user(kernbuf, buffer, count))
 938                 return -EFAULT;
 939         kernbuf[count] = 0;
 940
 941         buffer += lprocfs_find_named_value(kernbuf, "unstable_check:", &count) -
 942                   kernbuf;
 943         rc = lprocfs_str_to_s64(buffer, count, &val);
 944         if (rc < 0)
 945                 return rc;
 946
 947         /* borrow lru lock to set the value */
 948         spin_lock(&sbi->ll_cache->ccc_lru_lock);
 949         sbi->ll_cache->ccc_unstable_check = !!val;
 950         spin_unlock(&sbi->ll_cache->ccc_lru_lock);
 951
 952         return count;
 953 }
 954 LPROC_SEQ_FOPS(ll_unstable_stats);
 955
 956 static int ll_root_squash_seq_show(struct seq_file *m, void *v)
 957 {
 958         struct super_block *sb = m->private;
 959         struct ll_sb_info *sbi = ll_s2sbi(sb);
 960         struct root_squash_info *squash = &sbi->ll_squash;
 961
 962         seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
 963         return 0;
 964 }
 965
 966 static ssize_t ll_root_squash_seq_write(struct file *file,
 967                                         const char __user *buffer,
 968                                         size_t count, loff_t *off)
 969 {
 970         struct seq_file *m = file->private_data;
 971         struct super_block *sb = m->private;
 972         struct ll_sb_info *sbi = ll_s2sbi(sb);
 973         struct root_squash_info *squash = &sbi->ll_squash;
 974
 975         return lprocfs_wr_root_squash(buffer, count, squash,
 976                                       ll_get_fsname(sb, NULL, 0));
 977 }
 978 LPROC_SEQ_FOPS(ll_root_squash);
 979
 980 static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
 981 {
 982         struct super_block *sb = m->private;
 983         struct ll_sb_info *sbi = ll_s2sbi(sb);
 984         struct root_squash_info *squash = &sbi->ll_squash;
 985         int len;
 986
 987         down_read(&squash->rsi_sem);
 988         if (!list_empty(&squash->rsi_nosquash_nids)) {
 989                 len = cfs_print_nidlist(m->buf + m->count, m->size - m->count,
 990                                         &squash->rsi_nosquash_nids);
 991                 m->count += len;
 992                 seq_putc(m, '\n');
 993         } else {
 994                 seq_puts(m, "NONE\n");
 995         }
 996         up_read(&squash->rsi_sem);
 997
 998         return 0;
 999 }
1000
1001 static ssize_t ll_nosquash_nids_seq_write(struct file *file,
1002                                           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         struct root_squash_info *squash = &sbi->ll_squash;
1009         int rc;
1010
1011         rc = lprocfs_wr_nosquash_nids(buffer, count, squash,
1012                                       ll_get_fsname(sb, NULL, 0));
1013         if (rc < 0)
1014                 return rc;
1015
1016         ll_compute_rootsquash_state(sbi);
1017
1018         return rc;
1019 }
1020 LPROC_SEQ_FOPS(ll_nosquash_nids);
1021
1022 struct lprocfs_vars lprocfs_llite_obd_vars[] = {
1023         { .name =       "uuid",
1024           .fops =       &ll_sb_uuid_fops                        },
1025         { .name =       "fstype",
1026           .fops =       &ll_fstype_fops                         },
1027         { .name =       "site",
1028           .fops =       &ll_site_stats_fops                     },
1029         { .name =       "blocksize",
1030           .fops =       &ll_blksize_fops                        },
1031         { .name =       "kbytestotal",
1032           .fops =       &ll_kbytestotal_fops                    },
1033         { .name =       "kbytesfree",
1034           .fops =       &ll_kbytesfree_fops                     },
1035         { .name =       "kbytesavail",
1036           .fops =       &ll_kbytesavail_fops                    },
1037         { .name =       "filestotal",
1038           .fops =       &ll_filestotal_fops                     },
1039         { .name =       "filesfree",
1040           .fops =       &ll_filesfree_fops                      },
1041         { .name =       "client_type",
1042           .fops =       &ll_client_type_fops                    },
1043         { .name =       "max_read_ahead_mb",
1044           .fops =       &ll_max_readahead_mb_fops               },
1045         { .name =       "max_read_ahead_per_file_mb",
1046           .fops =       &ll_max_readahead_per_file_mb_fops      },
1047         { .name =       "max_read_ahead_whole_mb",
1048           .fops =       &ll_max_read_ahead_whole_mb_fops        },
1049         { .name =       "max_cached_mb",
1050           .fops =       &ll_max_cached_mb_fops                  },
1051         { .name =       "checksum_pages",
1052           .fops =       &ll_checksum_fops                       },
1053         { .name =       "stats_track_pid",
1054           .fops =       &ll_track_pid_fops                      },
1055         { .name =       "stats_track_ppid",
1056           .fops =       &ll_track_ppid_fops                     },
1057         { .name =       "stats_track_gid",
1058           .fops =       &ll_track_gid_fops                      },
1059         { .name =       "statahead_max",
1060           .fops =       &ll_statahead_max_fops                  },
1061         { .name =       "statahead_agl",
1062           .fops =       &ll_statahead_agl_fops                  },
1063         { .name =       "statahead_stats",
1064           .fops =       &ll_statahead_stats_fops                },
1065         { .name =       "lazystatfs",
1066           .fops =       &ll_lazystatfs_fops                     },
1067         { .name =       "max_easize",
1068           .fops =       &ll_max_easize_fops                     },
1069         { .name =       "default_easize",
1070           .fops =       &ll_default_easize_fops                 },
1071         { .name =       "sbi_flags",
1072           .fops =       &ll_sbi_flags_fops                      },
1073         { .name =       "xattr_cache",
1074           .fops =       &ll_xattr_cache_fops                    },
1075         { .name =       "unstable_stats",
1076           .fops =       &ll_unstable_stats_fops                 },
1077         { .name =       "root_squash",
1078           .fops =       &ll_root_squash_fops                    },
1079         { .name =       "nosquash_nids",
1080           .fops =       &ll_nosquash_nids_fops                  },
1081         { .name =       "fast_read",
1082           .fops =       &ll_fast_read_fops,                     },
1083         { NULL }
1084 };
1085
1086 #define MAX_STRING_SIZE 128
1087
1088 static const struct llite_file_opcode {
1089         __u32       opcode;
1090         __u32       type;
1091         const char *opname;
1092 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
1093         /* file operation */
1094         { LPROC_LL_DIRTY_HITS,     LPROCFS_TYPE_REGS, "dirty_pages_hits" },
1095         { LPROC_LL_DIRTY_MISSES,   LPROCFS_TYPE_REGS, "dirty_pages_misses" },
1096         { LPROC_LL_READ_BYTES,     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1097                                    "read_bytes" },
1098         { LPROC_LL_WRITE_BYTES,    LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1099                                    "write_bytes" },
1100         { LPROC_LL_BRW_READ,       LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1101                                    "brw_read" },
1102         { LPROC_LL_BRW_WRITE,      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1103                                    "brw_write" },
1104         { LPROC_LL_IOCTL,          LPROCFS_TYPE_REGS, "ioctl" },
1105         { LPROC_LL_OPEN,           LPROCFS_TYPE_REGS, "open" },
1106         { LPROC_LL_RELEASE,        LPROCFS_TYPE_REGS, "close" },
1107         { LPROC_LL_MAP,            LPROCFS_TYPE_REGS, "mmap" },
1108         { LPROC_LL_FAULT,          LPROCFS_TYPE_REGS, "page_fault" },
1109         { LPROC_LL_MKWRITE,        LPROCFS_TYPE_REGS, "page_mkwrite" },
1110         { LPROC_LL_LLSEEK,         LPROCFS_TYPE_REGS, "seek" },
1111         { LPROC_LL_FSYNC,          LPROCFS_TYPE_REGS, "fsync" },
1112         { LPROC_LL_READDIR,        LPROCFS_TYPE_REGS, "readdir" },
1113         /* inode operation */
1114         { LPROC_LL_SETATTR,        LPROCFS_TYPE_REGS, "setattr" },
1115         { LPROC_LL_TRUNC,          LPROCFS_TYPE_REGS, "truncate" },
1116         { LPROC_LL_FLOCK,          LPROCFS_TYPE_REGS, "flock" },
1117         { LPROC_LL_GETATTR,        LPROCFS_TYPE_REGS, "getattr" },
1118         /* dir inode operation */
1119         { LPROC_LL_CREATE,         LPROCFS_TYPE_REGS, "create" },
1120         { LPROC_LL_LINK,           LPROCFS_TYPE_REGS, "link" },
1121         { LPROC_LL_UNLINK,         LPROCFS_TYPE_REGS, "unlink" },
1122         { LPROC_LL_SYMLINK,        LPROCFS_TYPE_REGS, "symlink" },
1123         { LPROC_LL_MKDIR,          LPROCFS_TYPE_REGS, "mkdir" },
1124         { LPROC_LL_RMDIR,          LPROCFS_TYPE_REGS, "rmdir" },
1125         { LPROC_LL_MKNOD,          LPROCFS_TYPE_REGS, "mknod" },
1126         { LPROC_LL_RENAME,         LPROCFS_TYPE_REGS, "rename" },
1127         /* special inode operation */
1128         { LPROC_LL_STAFS,          LPROCFS_TYPE_REGS, "statfs" },
1129         { LPROC_LL_ALLOC_INODE,    LPROCFS_TYPE_REGS, "alloc_inode" },
1130         { LPROC_LL_SETXATTR,       LPROCFS_TYPE_REGS, "setxattr" },
1131         { LPROC_LL_GETXATTR,       LPROCFS_TYPE_REGS, "getxattr" },
1132         { LPROC_LL_GETXATTR_HITS,  LPROCFS_TYPE_REGS, "getxattr_hits" },
1133         { LPROC_LL_LISTXATTR,      LPROCFS_TYPE_REGS, "listxattr" },
1134         { LPROC_LL_REMOVEXATTR,    LPROCFS_TYPE_REGS, "removexattr" },
1135         { LPROC_LL_INODE_PERM,     LPROCFS_TYPE_REGS, "inode_permission" },
1136 };
1137
1138 void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
1139 {
1140         if (!sbi->ll_stats)
1141                 return;
1142         if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
1143                 lprocfs_counter_add(sbi->ll_stats, op, count);
1144         else if (sbi->ll_stats_track_type == STATS_TRACK_PID &&
1145                  sbi->ll_stats_track_id == current->pid)
1146                 lprocfs_counter_add(sbi->ll_stats, op, count);
1147         else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
1148                  sbi->ll_stats_track_id == current->parent->pid)
1149                 lprocfs_counter_add(sbi->ll_stats, op, count);
1150         else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
1151                  sbi->ll_stats_track_id ==
1152                         from_kgid(&init_user_ns, current_gid()))
1153                 lprocfs_counter_add(sbi->ll_stats, op, count);
1154 }
1155 EXPORT_SYMBOL(ll_stats_ops_tally);
1156
1157 static const char *ra_stat_string[] = {
1158         [RA_STAT_HIT] = "hits",
1159         [RA_STAT_MISS] = "misses",
1160         [RA_STAT_DISTANT_READPAGE] = "readpage not consecutive",
1161         [RA_STAT_MISS_IN_WINDOW] = "miss inside window",
1162         [RA_STAT_FAILED_GRAB_PAGE] = "failed grab_cache_page",
1163         [RA_STAT_FAILED_MATCH] = "failed lock match",
1164         [RA_STAT_DISCARDED] = "read but discarded",
1165         [RA_STAT_ZERO_LEN] = "zero length file",
1166         [RA_STAT_ZERO_WINDOW] = "zero size window",
1167         [RA_STAT_EOF] = "read-ahead to EOF",
1168         [RA_STAT_MAX_IN_FLIGHT] = "hit max r-a issue",
1169         [RA_STAT_WRONG_GRAB_PAGE] = "wrong page from grab_cache_page",
1170         [RA_STAT_FAILED_REACH_END] = "failed to reach end"
1171 };
1172
1173 LPROC_SEQ_FOPS_RO_TYPE(llite, name);
1174 LPROC_SEQ_FOPS_RO_TYPE(llite, uuid);
1175
1176 int lprocfs_register_mountpoint(struct proc_dir_entry *parent,
1177                                 struct super_block *sb, char *osc, char *mdc)
1178 {
1179         struct lprocfs_vars lvars[2];
1180         struct lustre_sb_info *lsi = s2lsi(sb);
1181         struct ll_sb_info *sbi = ll_s2sbi(sb);
1182         struct obd_device *obd;
1183         struct proc_dir_entry *dir;
1184         char name[MAX_STRING_SIZE + 1], *ptr;
1185         int err, id, len, rc;
1186         ENTRY;
1187
1188         memset(lvars, 0, sizeof(lvars));
1189
1190         name[MAX_STRING_SIZE] = '\0';
1191         lvars[0].name = name;
1192
1193         LASSERT(sbi != NULL);
1194         LASSERT(mdc != NULL);
1195         LASSERT(osc != NULL);
1196
1197         /* Get fsname */
1198         len = strlen(lsi->lsi_lmd->lmd_profile);
1199         ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
1200         if (ptr && (strcmp(ptr, "-client") == 0))
1201                 len -= 7;
1202
1203         /* Mount info */
1204         snprintf(name, MAX_STRING_SIZE, "%.*s-%p", len,
1205                  lsi->lsi_lmd->lmd_profile, sb);
1206
1207         sbi->ll_proc_root = lprocfs_register(name, parent, NULL, NULL);
1208         if (IS_ERR(sbi->ll_proc_root)) {
1209                 err = PTR_ERR(sbi->ll_proc_root);
1210                 sbi->ll_proc_root = NULL;
1211                 RETURN(err);
1212         }
1213
1214         rc = lprocfs_seq_create(sbi->ll_proc_root, "dump_page_cache", 0444,
1215                                 &vvp_dump_pgcache_file_ops, sbi);
1216         if (rc)
1217                 CWARN("Error adding the dump_page_cache file\n");
1218
1219         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats", 0644,
1220                                 &ll_rw_extents_stats_fops, sbi);
1221         if (rc)
1222                 CWARN("Error adding the extent_stats file\n");
1223
1224         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats_per_process",
1225                                 0644, &ll_rw_extents_stats_pp_fops, sbi);
1226         if (rc)
1227                 CWARN("Error adding the extents_stats_per_process file\n");
1228
1229         rc = lprocfs_seq_create(sbi->ll_proc_root, "offset_stats", 0644,
1230                                 &ll_rw_offset_stats_fops, sbi);
1231         if (rc)
1232                 CWARN("Error adding the offset_stats file\n");
1233
1234         /* File operations stats */
1235         sbi->ll_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES,
1236                                             LPROCFS_STATS_FLAG_NONE);
1237         if (sbi->ll_stats == NULL)
1238                 GOTO(out, err = -ENOMEM);
1239         /* do counter init */
1240         for (id = 0; id < LPROC_LL_FILE_OPCODES; id++) {
1241                 __u32 type = llite_opcode_table[id].type;
1242                 void *ptr = NULL;
1243                 if (type & LPROCFS_TYPE_REGS)
1244                         ptr = "regs";
1245                 else if (type & LPROCFS_TYPE_BYTES)
1246                         ptr = "bytes";
1247                 else if (type & LPROCFS_TYPE_PAGES)
1248                         ptr = "pages";
1249                 lprocfs_counter_init(sbi->ll_stats,
1250                                      llite_opcode_table[id].opcode,
1251                                      (type & LPROCFS_CNTR_AVGMINMAX),
1252                                      llite_opcode_table[id].opname, ptr);
1253         }
1254         err = lprocfs_register_stats(sbi->ll_proc_root, "stats", sbi->ll_stats);
1255         if (err)
1256                 GOTO(out, err);
1257
1258         sbi->ll_ra_stats = lprocfs_alloc_stats(ARRAY_SIZE(ra_stat_string),
1259                                                LPROCFS_STATS_FLAG_NONE);
1260         if (sbi->ll_ra_stats == NULL)
1261                 GOTO(out, err = -ENOMEM);
1262
1263         for (id = 0; id < ARRAY_SIZE(ra_stat_string); id++)
1264                 lprocfs_counter_init(sbi->ll_ra_stats, id, 0,
1265                                      ra_stat_string[id], "pages");
1266         err = lprocfs_register_stats(sbi->ll_proc_root, "read_ahead_stats",
1267                                      sbi->ll_ra_stats);
1268         if (err)
1269                 GOTO(out, err);
1270
1271
1272         err = lprocfs_add_vars(sbi->ll_proc_root, lprocfs_llite_obd_vars, sb);
1273         if (err)
1274                 GOTO(out, err);
1275
1276         /* MDC info */
1277         obd = class_name2obd(mdc);
1278
1279         LASSERT(obd != NULL);
1280         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1281         LASSERT(obd->obd_type->typ_name != NULL);
1282
1283         dir = proc_mkdir(obd->obd_type->typ_name, sbi->ll_proc_root);
1284         if (dir == NULL)
1285                 GOTO(out, err = -ENOMEM);
1286
1287         snprintf(name, MAX_STRING_SIZE, "common_name");
1288         lvars[0].fops = &llite_name_fops;
1289         err = lprocfs_add_vars(dir, lvars, obd);
1290         if (err)
1291                 GOTO(out, err);
1292
1293         snprintf(name, MAX_STRING_SIZE, "uuid");
1294         lvars[0].fops = &llite_uuid_fops;
1295         err = lprocfs_add_vars(dir, lvars, obd);
1296         if (err)
1297                 GOTO(out, err);
1298
1299         /* OSC */
1300         obd = class_name2obd(osc);
1301
1302         LASSERT(obd != NULL);
1303         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1304         LASSERT(obd->obd_type->typ_name != NULL);
1305
1306         dir = proc_mkdir(obd->obd_type->typ_name, sbi->ll_proc_root);
1307         if (dir == NULL)
1308                 GOTO(out, err = -ENOMEM);
1309
1310         snprintf(name, MAX_STRING_SIZE, "common_name");
1311         lvars[0].fops = &llite_name_fops;
1312         err = lprocfs_add_vars(dir, lvars, obd);
1313         if (err)
1314                 GOTO(out, err);
1315
1316         snprintf(name, MAX_STRING_SIZE, "uuid");
1317         lvars[0].fops = &llite_uuid_fops;
1318         err = lprocfs_add_vars(dir, lvars, obd);
1319 out:
1320         if (err) {
1321                 lprocfs_remove(&sbi->ll_proc_root);
1322                 lprocfs_free_stats(&sbi->ll_ra_stats);
1323                 lprocfs_free_stats(&sbi->ll_stats);
1324         }
1325         RETURN(err);
1326 }
1327
1328 void lprocfs_unregister_mountpoint(struct ll_sb_info *sbi)
1329 {
1330         if (sbi->ll_proc_root) {
1331                 lprocfs_remove(&sbi->ll_proc_root);
1332                 lprocfs_free_stats(&sbi->ll_ra_stats);
1333                 lprocfs_free_stats(&sbi->ll_stats);
1334         }
1335 }
1336 #undef MAX_STRING_SIZE
1337
1338 #define pct(a,b) (b ? a * 100 / b : 0)
1339
1340 static void ll_display_extents_info(struct ll_rw_extents_info *io_extents,
1341                                    struct seq_file *seq, int which)
1342 {
1343         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
1344         unsigned long start, end, r, w;
1345         char *unitp = "KMGTPEZY";
1346         int i, units = 10;
1347         struct per_process_info *pp_info = &io_extents->pp_extents[which];
1348
1349         read_cum = 0;
1350         write_cum = 0;
1351         start = 0;
1352
1353         for(i = 0; i < LL_HIST_MAX; i++) {
1354                 read_tot += pp_info->pp_r_hist.oh_buckets[i];
1355                 write_tot += pp_info->pp_w_hist.oh_buckets[i];
1356         }
1357
1358         for(i = 0; i < LL_HIST_MAX; i++) {
1359                 r = pp_info->pp_r_hist.oh_buckets[i];
1360                 w = pp_info->pp_w_hist.oh_buckets[i];
1361                 read_cum += r;
1362                 write_cum += w;
1363                 end = 1 << (i + LL_HIST_START - units);
1364                 seq_printf(seq, "%4lu%c - %4lu%c%c: %14lu %4lu %4lu  | "
1365                            "%14lu %4lu %4lu\n", start, *unitp, end, *unitp,
1366                            (i == LL_HIST_MAX - 1) ? '+' : ' ',
1367                            r, pct(r, read_tot), pct(read_cum, read_tot),
1368                            w, pct(w, write_tot), pct(write_cum, write_tot));
1369                 start = end;
1370                 if (start == 1<<10) {
1371                         start = 1;
1372                         units += 10;
1373                         unitp++;
1374                 }
1375                 if (read_cum == read_tot && write_cum == write_tot)
1376                         break;
1377         }
1378 }
1379
1380 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
1381 {
1382         struct timeval now;
1383         struct ll_sb_info *sbi = seq->private;
1384         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1385         int k;
1386
1387         do_gettimeofday(&now);
1388
1389         if (!sbi->ll_rw_stats_on) {
1390                 seq_puts(seq, "disabled\n write anything in this file to activate, then 0 or \[D/d]isabled\" to deactivate\n");
1391                 return 0;
1392         }
1393         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
1394                    now.tv_sec, now.tv_usec);
1395         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1396         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1397                    "extents", "calls", "%", "cum%",
1398                    "calls", "%", "cum%");
1399         spin_lock(&sbi->ll_pp_extent_lock);
1400         for (k = 0; k < LL_PROCESS_HIST_MAX; k++) {
1401                 if (io_extents->pp_extents[k].pid != 0) {
1402                         seq_printf(seq, "\nPID: %d\n",
1403                                    io_extents->pp_extents[k].pid);
1404                         ll_display_extents_info(io_extents, seq, k);
1405                 }
1406         }
1407         spin_unlock(&sbi->ll_pp_extent_lock);
1408         return 0;
1409 }
1410
1411 static ssize_t ll_rw_extents_stats_pp_seq_write(struct file *file,
1412                                                 const char __user *buf,
1413                                                 size_t len,
1414                                                 loff_t *off)
1415 {
1416         struct seq_file *seq = file->private_data;
1417         struct ll_sb_info *sbi = seq->private;
1418         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1419         int i;
1420         __s64 value = 1;
1421         int rc = 0;
1422
1423         if (len == 0)
1424                 return -EINVAL;
1425
1426         rc = lprocfs_str_to_s64(buf, len, &value);
1427         if (rc < 0 && len < 16) {
1428                 char kernbuf[16];
1429
1430                 if (copy_from_user(kernbuf, buf, len))
1431                         return -EFAULT;
1432                 kernbuf[len] = 0;
1433
1434                 if (kernbuf[len - 1] == '\n')
1435                         kernbuf[len - 1] = 0;
1436
1437                 if (strcmp(kernbuf, "disabled") == 0 ||
1438                     strcmp(kernbuf, "Disabled") == 0)
1439                         value = 0;
1440         }
1441
1442         if (value == 0)
1443                 sbi->ll_rw_stats_on = 0;
1444         else
1445                 sbi->ll_rw_stats_on = 1;
1446
1447         spin_lock(&sbi->ll_pp_extent_lock);
1448         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1449                 io_extents->pp_extents[i].pid = 0;
1450                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1451                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1452         }
1453         spin_unlock(&sbi->ll_pp_extent_lock);
1454         return len;
1455 }
1456
1457 LPROC_SEQ_FOPS(ll_rw_extents_stats_pp);
1458
1459 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
1460 {
1461         struct timeval now;
1462         struct ll_sb_info *sbi = seq->private;
1463         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1464
1465         do_gettimeofday(&now);
1466
1467         if (!sbi->ll_rw_stats_on) {
1468                 seq_puts(seq, "disabled\n write anything in this file to activate, then 0 or \"[D/d]isabled\" to deactivate\n");
1469                 return 0;
1470         }
1471         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
1472                    now.tv_sec, now.tv_usec);
1473
1474         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1475         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1476                    "extents", "calls", "%", "cum%",
1477                    "calls", "%", "cum%");
1478         spin_lock(&sbi->ll_lock);
1479         ll_display_extents_info(io_extents, seq, LL_PROCESS_HIST_MAX);
1480         spin_unlock(&sbi->ll_lock);
1481
1482         return 0;
1483 }
1484
1485 static ssize_t ll_rw_extents_stats_seq_write(struct file *file,
1486                                              const char __user *buf,
1487                                              size_t len, loff_t *off)
1488 {
1489         struct seq_file *seq = file->private_data;
1490         struct ll_sb_info *sbi = seq->private;
1491         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1492         int i;
1493         __s64 value = 1;
1494         int rc = 0;
1495
1496         if (len == 0)
1497                 return -EINVAL;
1498
1499         rc = lprocfs_str_to_s64(buf, len, &value);
1500         if (rc < 0 && len < 16) {
1501                 char kernbuf[16];
1502
1503                 if (copy_from_user(kernbuf, buf, len))
1504                         return -EFAULT;
1505                 kernbuf[len] = 0;
1506
1507                 if (kernbuf[len - 1] == '\n')
1508                         kernbuf[len - 1] = 0;
1509
1510                 if (strcmp(kernbuf, "disabled") == 0 ||
1511                     strcmp(kernbuf, "Disabled") == 0)
1512                         value = 0;
1513         }
1514
1515         if (value == 0)
1516                 sbi->ll_rw_stats_on = 0;
1517         else
1518                 sbi->ll_rw_stats_on = 1;
1519
1520         spin_lock(&sbi->ll_pp_extent_lock);
1521         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
1522                 io_extents->pp_extents[i].pid = 0;
1523                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1524                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1525         }
1526         spin_unlock(&sbi->ll_pp_extent_lock);
1527
1528         return len;
1529 }
1530 LPROC_SEQ_FOPS(ll_rw_extents_stats);
1531
1532 void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
1533                        struct ll_file_data *file, loff_t pos,
1534                        size_t count, int rw)
1535 {
1536         int i, cur = -1;
1537         struct ll_rw_process_info *process;
1538         struct ll_rw_process_info *offset;
1539         int *off_count = &sbi->ll_rw_offset_entry_count;
1540         int *process_count = &sbi->ll_offset_process_count;
1541         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1542
1543         if(!sbi->ll_rw_stats_on)
1544                 return;
1545         process = sbi->ll_rw_process_info;
1546         offset = sbi->ll_rw_offset_info;
1547
1548         spin_lock(&sbi->ll_pp_extent_lock);
1549         /* Extent statistics */
1550         for(i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1551                 if(io_extents->pp_extents[i].pid == pid) {
1552                         cur = i;
1553                         break;
1554                 }
1555         }
1556
1557         if (cur == -1) {
1558                 /* new process */
1559                 sbi->ll_extent_process_count =
1560                         (sbi->ll_extent_process_count + 1) % LL_PROCESS_HIST_MAX;
1561                 cur = sbi->ll_extent_process_count;
1562                 io_extents->pp_extents[cur].pid = pid;
1563                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_r_hist);
1564                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_w_hist);
1565         }
1566
1567         for(i = 0; (count >= (1 << LL_HIST_START << i)) &&
1568              (i < (LL_HIST_MAX - 1)); i++);
1569         if (rw == 0) {
1570                 io_extents->pp_extents[cur].pp_r_hist.oh_buckets[i]++;
1571                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_r_hist.oh_buckets[i]++;
1572         } else {
1573                 io_extents->pp_extents[cur].pp_w_hist.oh_buckets[i]++;
1574                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_w_hist.oh_buckets[i]++;
1575         }
1576         spin_unlock(&sbi->ll_pp_extent_lock);
1577
1578         spin_lock(&sbi->ll_process_lock);
1579         /* Offset statistics */
1580         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1581                 if (process[i].rw_pid == pid) {
1582                         if (process[i].rw_last_file != file) {
1583                                 process[i].rw_range_start = pos;
1584                                 process[i].rw_last_file_pos = pos + count;
1585                                 process[i].rw_smallest_extent = count;
1586                                 process[i].rw_largest_extent = count;
1587                                 process[i].rw_offset = 0;
1588                                 process[i].rw_last_file = file;
1589                                 spin_unlock(&sbi->ll_process_lock);
1590                                 return;
1591                         }
1592                         if (process[i].rw_last_file_pos != pos) {
1593                                 *off_count =
1594                                     (*off_count + 1) % LL_OFFSET_HIST_MAX;
1595                                 offset[*off_count].rw_op = process[i].rw_op;
1596                                 offset[*off_count].rw_pid = pid;
1597                                 offset[*off_count].rw_range_start =
1598                                         process[i].rw_range_start;
1599                                 offset[*off_count].rw_range_end =
1600                                         process[i].rw_last_file_pos;
1601                                 offset[*off_count].rw_smallest_extent =
1602                                         process[i].rw_smallest_extent;
1603                                 offset[*off_count].rw_largest_extent =
1604                                         process[i].rw_largest_extent;
1605                                 offset[*off_count].rw_offset =
1606                                         process[i].rw_offset;
1607                                 process[i].rw_op = rw;
1608                                 process[i].rw_range_start = pos;
1609                                 process[i].rw_smallest_extent = count;
1610                                 process[i].rw_largest_extent = count;
1611                                 process[i].rw_offset = pos -
1612                                         process[i].rw_last_file_pos;
1613                         }
1614                         if(process[i].rw_smallest_extent > count)
1615                                 process[i].rw_smallest_extent = count;
1616                         if(process[i].rw_largest_extent < count)
1617                                 process[i].rw_largest_extent = count;
1618                         process[i].rw_last_file_pos = pos + count;
1619                         spin_unlock(&sbi->ll_process_lock);
1620                         return;
1621                 }
1622         }
1623         *process_count = (*process_count + 1) % LL_PROCESS_HIST_MAX;
1624         process[*process_count].rw_pid = pid;
1625         process[*process_count].rw_op = rw;
1626         process[*process_count].rw_range_start = pos;
1627         process[*process_count].rw_last_file_pos = pos + count;
1628         process[*process_count].rw_smallest_extent = count;
1629         process[*process_count].rw_largest_extent = count;
1630         process[*process_count].rw_offset = 0;
1631         process[*process_count].rw_last_file = file;
1632         spin_unlock(&sbi->ll_process_lock);
1633 }
1634
1635 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
1636 {
1637         struct timeval now;
1638         struct ll_sb_info *sbi = seq->private;
1639         struct ll_rw_process_info *offset = sbi->ll_rw_offset_info;
1640         struct ll_rw_process_info *process = sbi->ll_rw_process_info;
1641         int i;
1642
1643         do_gettimeofday(&now);
1644
1645         if (!sbi->ll_rw_stats_on) {
1646                 seq_puts(seq, "disabled\n write anything in this file to activate, then 0 or \"[D/d]isabled\" to deactivate\n");
1647                 return 0;
1648         }
1649         spin_lock(&sbi->ll_process_lock);
1650
1651         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
1652                    now.tv_sec, now.tv_usec);
1653         seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
1654                    "R/W", "PID", "RANGE START", "RANGE END",
1655                    "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");
1656
1657         /* We stored the discontiguous offsets here; print them first */
1658         for (i = 0; i < LL_OFFSET_HIST_MAX; i++) {
1659                 if (offset[i].rw_pid != 0)
1660                         seq_printf(seq,
1661                                    "%3c %10d %14Lu %14Lu %17lu %17lu %14Lu",
1662                                    offset[i].rw_op == READ ? 'R' : 'W',
1663                                    offset[i].rw_pid,
1664                                    offset[i].rw_range_start,
1665                                    offset[i].rw_range_end,
1666                                    (unsigned long)offset[i].rw_smallest_extent,
1667                                    (unsigned long)offset[i].rw_largest_extent,
1668                                    offset[i].rw_offset);
1669         }
1670
1671         /* Then print the current offsets for each process */
1672         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1673                 if (process[i].rw_pid != 0)
1674                         seq_printf(seq,
1675                                    "%3c %10d %14Lu %14Lu %17lu %17lu %14Lu",
1676                                    process[i].rw_op == READ ? 'R' : 'W',
1677                                    process[i].rw_pid,
1678                                    process[i].rw_range_start,
1679                                    process[i].rw_last_file_pos,
1680                                    (unsigned long)process[i].rw_smallest_extent,
1681                                    (unsigned long)process[i].rw_largest_extent,
1682                                    process[i].rw_offset);
1683         }
1684         spin_unlock(&sbi->ll_process_lock);
1685
1686         return 0;
1687 }
1688
1689 static ssize_t ll_rw_offset_stats_seq_write(struct file *file,
1690                                             const char __user *buf,
1691                                             size_t len, loff_t *off)
1692 {
1693         struct seq_file *seq = file->private_data;
1694         struct ll_sb_info *sbi = seq->private;
1695         struct ll_rw_process_info *process_info = sbi->ll_rw_process_info;
1696         struct ll_rw_process_info *offset_info = sbi->ll_rw_offset_info;
1697         __s64 value = 1;
1698         int rc = 0;
1699
1700         if (len == 0)
1701                 return -EINVAL;
1702
1703         rc = lprocfs_str_to_s64(buf, len, &value);
1704
1705         if (rc < 0 && len < 16) {
1706                 char kernbuf[16];
1707
1708                 if (copy_from_user(kernbuf, buf, len))
1709                         return -EFAULT;
1710                 kernbuf[len] = 0;
1711
1712                 if (kernbuf[len - 1] == '\n')
1713                         kernbuf[len - 1] = 0;
1714
1715                 if (strcmp(kernbuf, "disabled") == 0 ||
1716                     strcmp(kernbuf, "Disabled") == 0)
1717                         value = 0;
1718         }
1719
1720         if (value == 0)
1721                 sbi->ll_rw_stats_on = 0;
1722         else
1723                 sbi->ll_rw_stats_on = 1;
1724
1725         spin_lock(&sbi->ll_process_lock);
1726         sbi->ll_offset_process_count = 0;
1727         sbi->ll_rw_offset_entry_count = 0;
1728         memset(process_info, 0, sizeof(struct ll_rw_process_info) *
1729                LL_PROCESS_HIST_MAX);
1730         memset(offset_info, 0, sizeof(struct ll_rw_process_info) *
1731                LL_OFFSET_HIST_MAX);
1732         spin_unlock(&sbi->ll_process_lock);
1733
1734         return len;
1735 }
1736
1737 LPROC_SEQ_FOPS(ll_rw_offset_stats);
1738 #endif /* CONFIG_PROC_FS */