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         seq_puts(m, "local client\n");
 182         return 0;
 183 }
 184 LPROC_SEQ_FOPS_RO(ll_client_type);
 185
 186 static int ll_fstype_seq_show(struct seq_file *m, void *v)
 187 {
 188         struct super_block *sb = m->private;
 189
 190         LASSERT(sb != NULL);
 191         seq_printf(m, "%s\n", sb->s_type->name);
 192         return 0;
 193 }
 194 LPROC_SEQ_FOPS_RO(ll_fstype);
 195
 196 static int ll_sb_uuid_seq_show(struct seq_file *m, void *v)
 197 {
 198         struct super_block *sb = m->private;
 199
 200         LASSERT(sb != NULL);
 201         seq_printf(m, "%s\n", ll_s2sbi(sb)->ll_sb_uuid.uuid);
 202         return 0;
 203 }
 204 LPROC_SEQ_FOPS_RO(ll_sb_uuid);
 205
 206 static int ll_xattr_cache_seq_show(struct seq_file *m, void *v)
 207 {
 208         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 209
 210         seq_printf(m, "%u\n", sbi->ll_xattr_cache_enabled);
 211         return 0;
 212 }
 213
 214 static ssize_t ll_xattr_cache_seq_write(struct file *file,
 215                                         const char __user *buffer,
 216                                         size_t count, loff_t *off)
 217 {
 218         struct seq_file *m = file->private_data;
 219         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 220         __s64 val;
 221         int rc;
 222
 223         rc = lprocfs_str_to_s64(buffer, count, &val);
 224         if (rc)
 225                 return rc;
 226
 227         if (val != 0 && val != 1)
 228                 return -ERANGE;
 229
 230         if (val == 1 && !(sbi->ll_flags & LL_SBI_XATTR_CACHE))
 231                 return -ENOTSUPP;
 232
 233         sbi->ll_xattr_cache_enabled = val;
 234
 235         return count;
 236 }
 237 LPROC_SEQ_FOPS(ll_xattr_cache);
 238
 239 static int ll_site_stats_seq_show(struct seq_file *m, void *v)
 240 {
 241         struct super_block *sb = m->private;
 242
 243         /*
 244          * See description of statistical counters in struct cl_site, and
 245          * struct lu_site.
 246          */
 247         return cl_site_stats_print(lu2cl_site(ll_s2sbi(sb)->ll_site), m);
 248 }
 249 LPROC_SEQ_FOPS_RO(ll_site_stats);
 250
 251 static int ll_max_readahead_mb_seq_show(struct seq_file *m, void *v)
 252 {
 253         struct super_block *sb = m->private;
 254         struct ll_sb_info *sbi = ll_s2sbi(sb);
 255         long pages_number;
 256         int mult;
 257
 258         spin_lock(&sbi->ll_lock);
 259         pages_number = sbi->ll_ra_info.ra_max_pages;
 260         spin_unlock(&sbi->ll_lock);
 261
 262         mult = 1 << (20 - PAGE_CACHE_SHIFT);
 263         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 264 }
 265
 266 static ssize_t
 267 ll_max_readahead_mb_seq_write(struct file *file, const char __user *buffer,
 268                               size_t count, loff_t *off)
 269 {
 270         struct seq_file *m = file->private_data;
 271         struct super_block *sb = m->private;
 272         struct ll_sb_info *sbi = ll_s2sbi(sb);
 273         __s64 pages_number;
 274         int rc;
 275
 276         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 277         if (rc)
 278                 return rc;
 279
 280         pages_number >>= PAGE_CACHE_SHIFT;
 281
 282         if (pages_number < 0 || pages_number > totalram_pages / 2) {
 283                 /* 1/2 of RAM */
 284                 CERROR("%s: can't set max_readahead_mb=%lu > %luMB\n",
 285                        ll_get_fsname(sb, NULL, 0),
 286                        (unsigned long)pages_number >> (20 - PAGE_CACHE_SHIFT),
 287                        totalram_pages >> (20 - PAGE_CACHE_SHIFT + 1));
 288                 return -ERANGE;
 289         }
 290
 291         spin_lock(&sbi->ll_lock);
 292         sbi->ll_ra_info.ra_max_pages = pages_number;
 293         spin_unlock(&sbi->ll_lock);
 294         return count;
 295 }
 296 LPROC_SEQ_FOPS(ll_max_readahead_mb);
 297
 298 static int ll_max_readahead_per_file_mb_seq_show(struct seq_file *m, void *v)
 299 {
 300         struct super_block *sb = m->private;
 301         struct ll_sb_info *sbi = ll_s2sbi(sb);
 302         long pages_number;
 303         int mult;
 304
 305         spin_lock(&sbi->ll_lock);
 306         pages_number = sbi->ll_ra_info.ra_max_pages_per_file;
 307         spin_unlock(&sbi->ll_lock);
 308
 309         mult = 1 << (20 - PAGE_CACHE_SHIFT);
 310         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 311 }
 312
 313 static ssize_t
 314 ll_max_readahead_per_file_mb_seq_write(struct file *file,
 315                                        const char __user *buffer,
 316                                        size_t count, loff_t *off)
 317 {
 318         struct seq_file *m = file->private_data;
 319         struct super_block *sb = m->private;
 320         struct ll_sb_info *sbi = ll_s2sbi(sb);
 321         int rc;
 322         __s64 pages_number;
 323
 324         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 325         if (rc)
 326                 return rc;
 327
 328         pages_number >>= PAGE_CACHE_SHIFT;
 329
 330         if (pages_number < 0 || pages_number > sbi->ll_ra_info.ra_max_pages) {
 331                 CERROR("%s: can't set max_readahead_per_file_mb=%lu > "
 332                        "max_read_ahead_mb=%lu\n", ll_get_fsname(sb, NULL, 0),
 333                        (unsigned long)pages_number >> (20 - PAGE_CACHE_SHIFT),
 334                        sbi->ll_ra_info.ra_max_pages >> (20 - PAGE_CACHE_SHIFT));
 335                 return -ERANGE;
 336         }
 337
 338         spin_lock(&sbi->ll_lock);
 339         sbi->ll_ra_info.ra_max_pages_per_file = pages_number;
 340         spin_unlock(&sbi->ll_lock);
 341         return count;
 342 }
 343 LPROC_SEQ_FOPS(ll_max_readahead_per_file_mb);
 344
 345 static int ll_max_read_ahead_whole_mb_seq_show(struct seq_file *m, void *v)
 346 {
 347         struct super_block *sb = m->private;
 348         struct ll_sb_info *sbi = ll_s2sbi(sb);
 349         long pages_number;
 350         int mult;
 351
 352         spin_lock(&sbi->ll_lock);
 353         pages_number = sbi->ll_ra_info.ra_max_read_ahead_whole_pages;
 354         spin_unlock(&sbi->ll_lock);
 355
 356         mult = 1 << (20 - PAGE_CACHE_SHIFT);
 357         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 358 }
 359
 360 static ssize_t
 361 ll_max_read_ahead_whole_mb_seq_write(struct file *file,
 362                                      const char __user *buffer,
 363                                      size_t count, loff_t *off)
 364 {
 365         struct seq_file *m = file->private_data;
 366         struct super_block *sb = m->private;
 367         struct ll_sb_info *sbi = ll_s2sbi(sb);
 368         int rc;
 369         __s64 pages_number;
 370
 371         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 372         if (rc)
 373                 return rc;
 374
 375         pages_number >>= PAGE_CACHE_SHIFT;
 376
 377         /* Cap this at the current max readahead window size, the readahead
 378          * algorithm does this anyway so it's pointless to set it larger. */
 379         if (pages_number < 0 ||
 380             pages_number > sbi->ll_ra_info.ra_max_pages_per_file) {
 381                 int pages_shift = 20 - PAGE_CACHE_SHIFT;
 382                 CERROR("%s: can't set max_read_ahead_whole_mb=%lu > "
 383                        "max_read_ahead_per_file_mb=%lu\n",
 384                        ll_get_fsname(sb, NULL, 0),
 385                        (unsigned long)pages_number >> pages_shift,
 386                        sbi->ll_ra_info.ra_max_pages_per_file >> pages_shift);
 387                 return -ERANGE;
 388         }
 389
 390         spin_lock(&sbi->ll_lock);
 391         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = pages_number;
 392         spin_unlock(&sbi->ll_lock);
 393         return count;
 394 }
 395 LPROC_SEQ_FOPS(ll_max_read_ahead_whole_mb);
 396
 397 static int ll_max_cached_mb_seq_show(struct seq_file *m, void *v)
 398 {
 399         struct super_block     *sb    = m->private;
 400         struct ll_sb_info      *sbi   = ll_s2sbi(sb);
 401         struct cl_client_cache *cache = sbi->ll_cache;
 402         int shift = 20 - PAGE_CACHE_SHIFT;
 403         long max_cached_mb;
 404         long unused_mb;
 405
 406         max_cached_mb = cache->ccc_lru_max >> shift;
 407         unused_mb = atomic_long_read(&cache->ccc_lru_left) >> shift;
 408         seq_printf(m, "users: %d\n"
 409                    "max_cached_mb: %ld\n"
 410                    "used_mb: %ld\n"
 411                    "unused_mb: %ld\n"
 412                    "reclaim_count: %u\n",
 413                    atomic_read(&cache->ccc_users),
 414                    max_cached_mb,
 415                    max_cached_mb - unused_mb,
 416                    unused_mb,
 417                    cache->ccc_lru_shrinkers);
 418         return 0;
 419 }
 420
 421 static ssize_t
 422 ll_max_cached_mb_seq_write(struct file *file, const char __user *buffer,
 423                            size_t count, loff_t *off)
 424 {
 425         struct seq_file *m = file->private_data;
 426         struct super_block *sb = m->private;
 427         struct ll_sb_info *sbi = ll_s2sbi(sb);
 428         struct cl_client_cache *cache = sbi->ll_cache;
 429         struct lu_env *env;
 430         long diff = 0;
 431         long nrpages = 0;
 432         __u16 refcheck;
 433         __s64 pages_number;
 434         long rc;
 435         char kernbuf[128];
 436         ENTRY;
 437
 438         if (count >= sizeof(kernbuf))
 439                 RETURN(-EINVAL);
 440
 441         if (copy_from_user(kernbuf, buffer, count))
 442                 RETURN(-EFAULT);
 443         kernbuf[count] = 0;
 444
 445         buffer += lprocfs_find_named_value(kernbuf, "max_cached_mb:", &count) -
 446                   kernbuf;
 447         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 448         if (rc)
 449                 RETURN(rc);
 450
 451         pages_number >>= PAGE_CACHE_SHIFT;
 452
 453         if (pages_number < 0 || pages_number > totalram_pages) {
 454                 CERROR("%s: can't set max cache more than %lu MB\n",
 455                        ll_get_fsname(sb, NULL, 0),
 456                        totalram_pages >> (20 - PAGE_CACHE_SHIFT));
 457                 RETURN(-ERANGE);
 458         }
 459         /* Allow enough cache so clients can make well-formed RPCs */
 460         pages_number = max_t(long, pages_number, PTLRPC_MAX_BRW_PAGES);
 461
 462         spin_lock(&sbi->ll_lock);
 463         diff = pages_number - cache->ccc_lru_max;
 464         spin_unlock(&sbi->ll_lock);
 465
 466         /* easy - add more LRU slots. */
 467         if (diff >= 0) {
 468                 atomic_long_add(diff, &cache->ccc_lru_left);
 469                 GOTO(out, rc = 0);
 470         }
 471
 472         env = cl_env_get(&refcheck);
 473         if (IS_ERR(env))
 474                 RETURN(rc);
 475
 476         diff = -diff;
 477         while (diff > 0) {
 478                 long tmp;
 479
 480                 /* reduce LRU budget from free slots. */
 481                 do {
 482                         long ov, nv;
 483
 484                         ov = atomic_long_read(&cache->ccc_lru_left);
 485                         if (ov == 0)
 486                                 break;
 487
 488                         nv = ov > diff ? ov - diff : 0;
 489                         rc = atomic_long_cmpxchg(&cache->ccc_lru_left, ov, nv);
 490                         if (likely(ov == rc)) {
 491                                 diff -= ov - nv;
 492                                 nrpages += ov - nv;
 493                                 break;
 494                         }
 495                 } while (1);
 496
 497                 if (diff <= 0)
 498                         break;
 499
 500                 if (sbi->ll_dt_exp == NULL) { /* being initialized */
 501                         rc = -ENODEV;
 502                         break;
 503                 }
 504
 505                 /* difficult - have to ask OSCs to drop LRU slots. */
 506                 tmp = diff << 1;
 507                 rc = obd_set_info_async(env, sbi->ll_dt_exp,
 508                                 sizeof(KEY_CACHE_LRU_SHRINK),
 509                                 KEY_CACHE_LRU_SHRINK,
 510                                 sizeof(tmp), &tmp, NULL);
 511                 if (rc < 0)
 512                         break;
 513         }
 514         cl_env_put(env, &refcheck);
 515
 516 out:
 517         if (rc >= 0) {
 518                 spin_lock(&sbi->ll_lock);
 519                 cache->ccc_lru_max = pages_number;
 520                 spin_unlock(&sbi->ll_lock);
 521                 rc = count;
 522         } else {
 523                 atomic_long_add(nrpages, &cache->ccc_lru_left);
 524         }
 525         return rc;
 526 }
 527 LPROC_SEQ_FOPS(ll_max_cached_mb);
 528
 529 static int ll_checksum_seq_show(struct seq_file *m, void *v)
 530 {
 531         struct super_block *sb = m->private;
 532         struct ll_sb_info *sbi = ll_s2sbi(sb);
 533
 534         seq_printf(m, "%u\n", (sbi->ll_flags & LL_SBI_CHECKSUM) ? 1 : 0);
 535         return 0;
 536 }
 537
 538 static ssize_t ll_checksum_seq_write(struct file *file,
 539                                      const char __user *buffer,
 540                                      size_t count, loff_t *off)
 541 {
 542         struct seq_file *m = file->private_data;
 543         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 544         int rc;
 545         __s64 val;
 546
 547         if (!sbi->ll_dt_exp)
 548                 /* Not set up yet */
 549                 return -EAGAIN;
 550
 551         rc = lprocfs_str_to_s64(buffer, count, &val);
 552         if (rc)
 553                 return rc;
 554         if (val)
 555                 sbi->ll_flags |= LL_SBI_CHECKSUM;
 556         else
 557                 sbi->ll_flags &= ~LL_SBI_CHECKSUM;
 558
 559         rc = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 560                                 KEY_CHECKSUM, sizeof(val), &val, NULL);
 561         if (rc)
 562                 CWARN("Failed to set OSC checksum flags: %d\n", rc);
 563
 564         return count;
 565 }
 566 LPROC_SEQ_FOPS(ll_checksum);
 567
 568 static int ll_rd_track_id(struct seq_file *m, enum stats_track_type type)
 569 {
 570         struct super_block *sb = m->private;
 571
 572         if (ll_s2sbi(sb)->ll_stats_track_type == type) {
 573                 seq_printf(m, "%d\n",
 574                            ll_s2sbi(sb)->ll_stats_track_id);
 575         } else if (ll_s2sbi(sb)->ll_stats_track_type == STATS_TRACK_ALL) {
 576                 seq_puts(m, "0 (all)\n");
 577         } else {
 578                 seq_puts(m, "untracked\n");
 579         }
 580         return 0;
 581 }
 582
 583 static int ll_wr_track_id(const char __user *buffer, unsigned long count,
 584                           void *data, enum stats_track_type type)
 585 {
 586         struct super_block *sb = data;
 587         int rc;
 588         __s64 pid;
 589
 590         rc = lprocfs_str_to_s64(buffer, count, &pid);
 591         if (rc)
 592                 return rc;
 593         if (pid > INT_MAX || pid < 0)
 594                 return -ERANGE;
 595
 596         ll_s2sbi(sb)->ll_stats_track_id = pid;
 597         if (pid == 0)
 598                 ll_s2sbi(sb)->ll_stats_track_type = STATS_TRACK_ALL;
 599         else
 600                 ll_s2sbi(sb)->ll_stats_track_type = type;
 601         lprocfs_clear_stats(ll_s2sbi(sb)->ll_stats);
 602         return count;
 603 }
 604
 605 static int ll_track_pid_seq_show(struct seq_file *m, void *v)
 606 {
 607         return ll_rd_track_id(m, STATS_TRACK_PID);
 608 }
 609
 610 static ssize_t ll_track_pid_seq_write(struct file *file,
 611                                       const char __user *buffer,
 612                                       size_t count, loff_t *off)
 613 {
 614         struct seq_file *seq = file->private_data;
 615         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PID);
 616 }
 617 LPROC_SEQ_FOPS(ll_track_pid);
 618
 619 static int ll_track_ppid_seq_show(struct seq_file *m, void *v)
 620 {
 621         return ll_rd_track_id(m, STATS_TRACK_PPID);
 622 }
 623
 624 static ssize_t ll_track_ppid_seq_write(struct file *file,
 625                                        const char __user *buffer,
 626                                        size_t count, loff_t *off)
 627 {
 628         struct seq_file *seq = file->private_data;
 629         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_PPID);
 630 }
 631 LPROC_SEQ_FOPS(ll_track_ppid);
 632
 633 static int ll_track_gid_seq_show(struct seq_file *m, void *v)
 634 {
 635         return ll_rd_track_id(m, STATS_TRACK_GID);
 636 }
 637
 638 static ssize_t ll_track_gid_seq_write(struct file *file,
 639                                       const char __user *buffer,
 640                                       size_t count, loff_t *off)
 641 {
 642         struct seq_file *seq = file->private_data;
 643         return ll_wr_track_id(buffer, count, seq->private, STATS_TRACK_GID);
 644 }
 645 LPROC_SEQ_FOPS(ll_track_gid);
 646
 647 static int ll_statahead_max_seq_show(struct seq_file *m, void *v)
 648 {
 649         struct super_block *sb = m->private;
 650         struct ll_sb_info *sbi = ll_s2sbi(sb);
 651
 652         seq_printf(m, "%u\n", sbi->ll_sa_max);
 653         return 0;
 654 }
 655
 656 static ssize_t ll_statahead_max_seq_write(struct file *file,
 657                                           const char __user *buffer,
 658                                           size_t count, loff_t *off)
 659 {
 660         struct seq_file *m = file->private_data;
 661         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 662         int rc;
 663         __s64 val;
 664
 665         rc = lprocfs_str_to_s64(buffer, count, &val);
 666         if (rc)
 667                 return rc;
 668
 669         if (val >= 0 && val <= LL_SA_RPC_MAX)
 670                 sbi->ll_sa_max = val;
 671         else
 672                 CERROR("Bad statahead_max value "LPD64". Valid values are in "
 673                        "the range [0, %d]\n", val, LL_SA_RPC_MAX);
 674
 675         return count;
 676 }
 677 LPROC_SEQ_FOPS(ll_statahead_max);
 678
 679 static int ll_statahead_agl_seq_show(struct seq_file *m, void *v)
 680 {
 681         struct super_block *sb = m->private;
 682         struct ll_sb_info *sbi = ll_s2sbi(sb);
 683
 684         seq_printf(m, "%u\n",
 685                    sbi->ll_flags & LL_SBI_AGL_ENABLED ? 1 : 0);
 686         return 0;
 687 }
 688
 689 static ssize_t ll_statahead_agl_seq_write(struct file *file,
 690                                           const char __user *buffer,
 691                                           size_t count, loff_t *off)
 692 {
 693         struct seq_file *m = file->private_data;
 694         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 695         int rc;
 696         __s64 val;
 697
 698         rc = lprocfs_str_to_s64(buffer, count, &val);
 699         if (rc)
 700                 return rc;
 701
 702         if (val)
 703                 sbi->ll_flags |= LL_SBI_AGL_ENABLED;
 704         else
 705                 sbi->ll_flags &= ~LL_SBI_AGL_ENABLED;
 706
 707         return count;
 708 }
 709 LPROC_SEQ_FOPS(ll_statahead_agl);
 710
 711 static int ll_statahead_stats_seq_show(struct seq_file *m, void *v)
 712 {
 713         struct super_block *sb = m->private;
 714         struct ll_sb_info *sbi = ll_s2sbi(sb);
 715
 716         seq_printf(m, "statahead total: %u\n"
 717                     "statahead wrong: %u\n"
 718                     "agl total: %u\n",
 719                     atomic_read(&sbi->ll_sa_total),
 720                     atomic_read(&sbi->ll_sa_wrong),
 721                     atomic_read(&sbi->ll_agl_total));
 722         return 0;
 723 }
 724 LPROC_SEQ_FOPS_RO(ll_statahead_stats);
 725
 726 static int ll_lazystatfs_seq_show(struct seq_file *m, void *v)
 727 {
 728         struct super_block *sb = m->private;
 729         struct ll_sb_info *sbi = ll_s2sbi(sb);
 730
 731         seq_printf(m, "%u\n",
 732                    (sbi->ll_flags & LL_SBI_LAZYSTATFS) ? 1 : 0);
 733         return 0;
 734 }
 735
 736 static ssize_t ll_lazystatfs_seq_write(struct file *file,
 737                                        const char __user *buffer,
 738                                         size_t count, loff_t *off)
 739 {
 740         struct seq_file *m = file->private_data;
 741         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 742         int rc;
 743         __s64 val;
 744
 745         rc = lprocfs_str_to_s64(buffer, count, &val);
 746         if (rc)
 747                 return rc;
 748
 749         if (val)
 750                 sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 751         else
 752                 sbi->ll_flags &= ~LL_SBI_LAZYSTATFS;
 753
 754         return count;
 755 }
 756 LPROC_SEQ_FOPS(ll_lazystatfs);
 757
 758 static int ll_max_easize_seq_show(struct seq_file *m, void *v)
 759 {
 760         struct super_block *sb = m->private;
 761         struct ll_sb_info *sbi = ll_s2sbi(sb);
 762         unsigned int ealen;
 763         int rc;
 764
 765         rc = ll_get_max_mdsize(sbi, &ealen);
 766         if (rc)
 767                 return rc;
 768
 769         seq_printf(m, "%u\n", ealen);
 770         return 0;
 771 }
 772 LPROC_SEQ_FOPS_RO(ll_max_easize);
 773
 774 /**
 775  * Get default_easize.
 776  *
 777  * \see client_obd::cl_default_mds_easize
 778  *
 779  * \param[in] m         seq_file handle
 780  * \param[in] v         unused for single entry
 781  *
 782  * \retval 0            on success
 783  * \retval negative     negated errno on failure
 784  */
 785 static int ll_default_easize_seq_show(struct seq_file *m, void *v)
 786 {
 787         struct super_block *sb = m->private;
 788         struct ll_sb_info *sbi = ll_s2sbi(sb);
 789         unsigned int ealen;
 790         int rc;
 791
 792         rc = ll_get_default_mdsize(sbi, &ealen);
 793         if (rc)
 794                 return rc;
 795
 796         seq_printf(m, "%u\n", ealen);
 797         return 0;
 798 }
 799
 800 /**
 801  * Set default_easize.
 802  *
 803  * Range checking on the passed value is handled by
 804  * ll_set_default_mdsize().
 805  *
 806  * \see client_obd::cl_default_mds_easize
 807  *
 808  * \param[in] file      proc file
 809  * \param[in] buffer    string passed from user space
 810  * \param[in] count     \a buffer length
 811  * \param[in] off       unused for single entry
 812  *
 813  * \retval positive     \a count on success
 814  * \retval negative     negated errno on failure
 815  */
 816 static ssize_t ll_default_easize_seq_write(struct file *file,
 817                                            const char __user *buffer,
 818                                            size_t count, loff_t *unused)
 819 {
 820         struct seq_file *seq = file->private_data;
 821         struct super_block *sb = (struct super_block *)seq->private;
 822         struct ll_sb_info *sbi = ll_s2sbi(sb);
 823         __s64 val;
 824         int rc;
 825
 826         if (count == 0)
 827                 return 0;
 828
 829         rc = lprocfs_str_to_s64(buffer, count, &val);
 830         if (rc)
 831                 return rc;
 832         if (val < 0 || val > INT_MAX)
 833                 return -ERANGE;
 834
 835         rc = ll_set_default_mdsize(sbi, val);
 836         if (rc)
 837                 return rc;
 838
 839         return count;
 840 }
 841 LPROC_SEQ_FOPS(ll_default_easize);
 842
 843 static int ll_sbi_flags_seq_show(struct seq_file *m, void *v)
 844 {
 845         const char *str[] = LL_SBI_FLAGS;
 846         struct super_block *sb = m->private;
 847         int flags = ll_s2sbi(sb)->ll_flags;
 848         int i = 0;
 849
 850         while (flags != 0) {
 851                 if (ARRAY_SIZE(str) <= i) {
 852                         CERROR("%s: Revise array LL_SBI_FLAGS to match sbi "
 853                                 "flags please.\n", ll_get_fsname(sb, NULL, 0));
 854                         return -EINVAL;
 855                 }
 856
 857                 if (flags & 0x1)
 858                         seq_printf(m, "%s ", str[i]);
 859                 flags >>= 1;
 860                 ++i;
 861         }
 862         seq_printf(m, "\b\n");
 863         return 0;
 864 }
 865 LPROC_SEQ_FOPS_RO(ll_sbi_flags);
 866
 867 static int ll_fast_read_seq_show(struct seq_file *m, void *v)
 868 {
 869         struct super_block *sb = m->private;
 870         struct ll_sb_info *sbi = ll_s2sbi(sb);
 871
 872         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_FAST_READ));
 873         return 0;
 874 }
 875
 876 static ssize_t
 877 ll_fast_read_seq_write(struct file *file, const char __user *buffer,
 878                        size_t count, loff_t *off)
 879 {
 880         struct seq_file *m = file->private_data;
 881         struct super_block *sb = m->private;
 882         struct ll_sb_info *sbi = ll_s2sbi(sb);
 883         int rc;
 884         __s64 val;
 885
 886         rc = lprocfs_str_to_s64(buffer, count, &val);
 887         if (rc)
 888                 return rc;
 889
 890         spin_lock(&sbi->ll_lock);
 891         if (val == 1)
 892                 sbi->ll_flags |= LL_SBI_FAST_READ;
 893         else
 894                 sbi->ll_flags &= ~LL_SBI_FAST_READ;
 895         spin_unlock(&sbi->ll_lock);
 896
 897         return count;
 898 }
 899 LPROC_SEQ_FOPS(ll_fast_read);
 900
 901 static int ll_unstable_stats_seq_show(struct seq_file *m, void *v)
 902 {
 903         struct super_block      *sb    = m->private;
 904         struct ll_sb_info       *sbi   = ll_s2sbi(sb);
 905         struct cl_client_cache  *cache = sbi->ll_cache;
 906         long pages;
 907         int mb;
 908
 909         pages = atomic_long_read(&cache->ccc_unstable_nr);
 910         mb    = (pages * PAGE_CACHE_SIZE) >> 20;
 911
 912         seq_printf(m, "unstable_check:     %8d\n"
 913                    "unstable_pages: %12ld\n"
 914                    "unstable_mb:        %8d\n",
 915                    cache->ccc_unstable_check, pages, mb);
 916         return 0;
 917 }
 918
 919 static ssize_t ll_unstable_stats_seq_write(struct file *file,
 920                                            const char __user *buffer,
 921                                            size_t count, loff_t *unused)
 922 {
 923         struct seq_file *seq = file->private_data;
 924         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)seq->private);
 925         char kernbuf[128];
 926         int rc;
 927         __s64 val;
 928
 929         if (count == 0)
 930                 return 0;
 931         if (count >= sizeof(kernbuf))
 932                 return -EINVAL;
 933
 934         if (copy_from_user(kernbuf, buffer, count))
 935                 return -EFAULT;
 936         kernbuf[count] = 0;
 937
 938         buffer += lprocfs_find_named_value(kernbuf, "unstable_check:", &count) -
 939                   kernbuf;
 940         rc = lprocfs_str_to_s64(buffer, count, &val);
 941         if (rc < 0)
 942                 return rc;
 943
 944         /* borrow lru lock to set the value */
 945         spin_lock(&sbi->ll_cache->ccc_lru_lock);
 946         sbi->ll_cache->ccc_unstable_check = !!val;
 947         spin_unlock(&sbi->ll_cache->ccc_lru_lock);
 948
 949         return count;
 950 }
 951 LPROC_SEQ_FOPS(ll_unstable_stats);
 952
 953 static int ll_root_squash_seq_show(struct seq_file *m, void *v)
 954 {
 955         struct super_block *sb = m->private;
 956         struct ll_sb_info *sbi = ll_s2sbi(sb);
 957         struct root_squash_info *squash = &sbi->ll_squash;
 958
 959         seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
 960         return 0;
 961 }
 962
 963 static ssize_t ll_root_squash_seq_write(struct file *file,
 964                                         const char __user *buffer,
 965                                         size_t count, loff_t *off)
 966 {
 967         struct seq_file *m = file->private_data;
 968         struct super_block *sb = m->private;
 969         struct ll_sb_info *sbi = ll_s2sbi(sb);
 970         struct root_squash_info *squash = &sbi->ll_squash;
 971
 972         return lprocfs_wr_root_squash(buffer, count, squash,
 973                                       ll_get_fsname(sb, NULL, 0));
 974 }
 975 LPROC_SEQ_FOPS(ll_root_squash);
 976
 977 static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
 978 {
 979         struct super_block *sb = m->private;
 980         struct ll_sb_info *sbi = ll_s2sbi(sb);
 981         struct root_squash_info *squash = &sbi->ll_squash;
 982         int len;
 983
 984         down_read(&squash->rsi_sem);
 985         if (!list_empty(&squash->rsi_nosquash_nids)) {
 986                 len = cfs_print_nidlist(m->buf + m->count, m->size - m->count,
 987                                         &squash->rsi_nosquash_nids);
 988                 m->count += len;
 989                 seq_putc(m, '\n');
 990         } else {
 991                 seq_puts(m, "NONE\n");
 992         }
 993         up_read(&squash->rsi_sem);
 994
 995         return 0;
 996 }
 997
 998 static ssize_t ll_nosquash_nids_seq_write(struct file *file,
 999                                           const char __user *buffer,
1000                                           size_t count, loff_t *off)
1001 {
1002         struct seq_file *m = file->private_data;
1003         struct super_block *sb = m->private;
1004         struct ll_sb_info *sbi = ll_s2sbi(sb);
1005         struct root_squash_info *squash = &sbi->ll_squash;
1006         int rc;
1007
1008         rc = lprocfs_wr_nosquash_nids(buffer, count, squash,
1009                                       ll_get_fsname(sb, NULL, 0));
1010         if (rc < 0)
1011                 return rc;
1012
1013         ll_compute_rootsquash_state(sbi);
1014
1015         return rc;
1016 }
1017 LPROC_SEQ_FOPS(ll_nosquash_nids);
1018
1019 struct lprocfs_vars lprocfs_llite_obd_vars[] = {
1020         { .name =       "uuid",
1021           .fops =       &ll_sb_uuid_fops                        },
1022         { .name =       "fstype",
1023           .fops =       &ll_fstype_fops                         },
1024         { .name =       "site",
1025           .fops =       &ll_site_stats_fops                     },
1026         { .name =       "blocksize",
1027           .fops =       &ll_blksize_fops                        },
1028         { .name =       "kbytestotal",
1029           .fops =       &ll_kbytestotal_fops                    },
1030         { .name =       "kbytesfree",
1031           .fops =       &ll_kbytesfree_fops                     },
1032         { .name =       "kbytesavail",
1033           .fops =       &ll_kbytesavail_fops                    },
1034         { .name =       "filestotal",
1035           .fops =       &ll_filestotal_fops                     },
1036         { .name =       "filesfree",
1037           .fops =       &ll_filesfree_fops                      },
1038         { .name =       "client_type",
1039           .fops =       &ll_client_type_fops                    },
1040         { .name =       "max_read_ahead_mb",
1041           .fops =       &ll_max_readahead_mb_fops               },
1042         { .name =       "max_read_ahead_per_file_mb",
1043           .fops =       &ll_max_readahead_per_file_mb_fops      },
1044         { .name =       "max_read_ahead_whole_mb",
1045           .fops =       &ll_max_read_ahead_whole_mb_fops        },
1046         { .name =       "max_cached_mb",
1047           .fops =       &ll_max_cached_mb_fops                  },
1048         { .name =       "checksum_pages",
1049           .fops =       &ll_checksum_fops                       },
1050         { .name =       "stats_track_pid",
1051           .fops =       &ll_track_pid_fops                      },
1052         { .name =       "stats_track_ppid",
1053           .fops =       &ll_track_ppid_fops                     },
1054         { .name =       "stats_track_gid",
1055           .fops =       &ll_track_gid_fops                      },
1056         { .name =       "statahead_max",
1057           .fops =       &ll_statahead_max_fops                  },
1058         { .name =       "statahead_agl",
1059           .fops =       &ll_statahead_agl_fops                  },
1060         { .name =       "statahead_stats",
1061           .fops =       &ll_statahead_stats_fops                },
1062         { .name =       "lazystatfs",
1063           .fops =       &ll_lazystatfs_fops                     },
1064         { .name =       "max_easize",
1065           .fops =       &ll_max_easize_fops                     },
1066         { .name =       "default_easize",
1067           .fops =       &ll_default_easize_fops                 },
1068         { .name =       "sbi_flags",
1069           .fops =       &ll_sbi_flags_fops                      },
1070         { .name =       "xattr_cache",
1071           .fops =       &ll_xattr_cache_fops                    },
1072         { .name =       "unstable_stats",
1073           .fops =       &ll_unstable_stats_fops                 },
1074         { .name =       "root_squash",
1075           .fops =       &ll_root_squash_fops                    },
1076         { .name =       "nosquash_nids",
1077           .fops =       &ll_nosquash_nids_fops                  },
1078         { .name =       "fast_read",
1079           .fops =       &ll_fast_read_fops,                     },
1080         { NULL }
1081 };
1082
1083 #define MAX_STRING_SIZE 128
1084
1085 static const struct llite_file_opcode {
1086         __u32       opcode;
1087         __u32       type;
1088         const char *opname;
1089 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
1090         /* file operation */
1091         { LPROC_LL_DIRTY_HITS,     LPROCFS_TYPE_REGS, "dirty_pages_hits" },
1092         { LPROC_LL_DIRTY_MISSES,   LPROCFS_TYPE_REGS, "dirty_pages_misses" },
1093         { LPROC_LL_READ_BYTES,     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1094                                    "read_bytes" },
1095         { LPROC_LL_WRITE_BYTES,    LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1096                                    "write_bytes" },
1097         { LPROC_LL_BRW_READ,       LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1098                                    "brw_read" },
1099         { LPROC_LL_BRW_WRITE,      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1100                                    "brw_write" },
1101         { LPROC_LL_IOCTL,          LPROCFS_TYPE_REGS, "ioctl" },
1102         { LPROC_LL_OPEN,           LPROCFS_TYPE_REGS, "open" },
1103         { LPROC_LL_RELEASE,        LPROCFS_TYPE_REGS, "close" },
1104         { LPROC_LL_MAP,            LPROCFS_TYPE_REGS, "mmap" },
1105         { LPROC_LL_FAULT,          LPROCFS_TYPE_REGS, "page_fault" },
1106         { LPROC_LL_MKWRITE,        LPROCFS_TYPE_REGS, "page_mkwrite" },
1107         { LPROC_LL_LLSEEK,         LPROCFS_TYPE_REGS, "seek" },
1108         { LPROC_LL_FSYNC,          LPROCFS_TYPE_REGS, "fsync" },
1109         { LPROC_LL_READDIR,        LPROCFS_TYPE_REGS, "readdir" },
1110         /* inode operation */
1111         { LPROC_LL_SETATTR,        LPROCFS_TYPE_REGS, "setattr" },
1112         { LPROC_LL_TRUNC,          LPROCFS_TYPE_REGS, "truncate" },
1113         { LPROC_LL_FLOCK,          LPROCFS_TYPE_REGS, "flock" },
1114         { LPROC_LL_GETATTR,        LPROCFS_TYPE_REGS, "getattr" },
1115         /* dir inode operation */
1116         { LPROC_LL_CREATE,         LPROCFS_TYPE_REGS, "create" },
1117         { LPROC_LL_LINK,           LPROCFS_TYPE_REGS, "link" },
1118         { LPROC_LL_UNLINK,         LPROCFS_TYPE_REGS, "unlink" },
1119         { LPROC_LL_SYMLINK,        LPROCFS_TYPE_REGS, "symlink" },
1120         { LPROC_LL_MKDIR,          LPROCFS_TYPE_REGS, "mkdir" },
1121         { LPROC_LL_RMDIR,          LPROCFS_TYPE_REGS, "rmdir" },
1122         { LPROC_LL_MKNOD,          LPROCFS_TYPE_REGS, "mknod" },
1123         { LPROC_LL_RENAME,         LPROCFS_TYPE_REGS, "rename" },
1124         /* special inode operation */
1125         { LPROC_LL_STAFS,          LPROCFS_TYPE_REGS, "statfs" },
1126         { LPROC_LL_ALLOC_INODE,    LPROCFS_TYPE_REGS, "alloc_inode" },
1127         { LPROC_LL_SETXATTR,       LPROCFS_TYPE_REGS, "setxattr" },
1128         { LPROC_LL_GETXATTR,       LPROCFS_TYPE_REGS, "getxattr" },
1129         { LPROC_LL_GETXATTR_HITS,  LPROCFS_TYPE_REGS, "getxattr_hits" },
1130         { LPROC_LL_LISTXATTR,      LPROCFS_TYPE_REGS, "listxattr" },
1131         { LPROC_LL_REMOVEXATTR,    LPROCFS_TYPE_REGS, "removexattr" },
1132         { LPROC_LL_INODE_PERM,     LPROCFS_TYPE_REGS, "inode_permission" },
1133 };
1134
1135 void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
1136 {
1137         if (!sbi->ll_stats)
1138                 return;
1139         if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
1140                 lprocfs_counter_add(sbi->ll_stats, op, count);
1141         else if (sbi->ll_stats_track_type == STATS_TRACK_PID &&
1142                  sbi->ll_stats_track_id == current->pid)
1143                 lprocfs_counter_add(sbi->ll_stats, op, count);
1144         else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
1145                  sbi->ll_stats_track_id == current->parent->pid)
1146                 lprocfs_counter_add(sbi->ll_stats, op, count);
1147         else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
1148                  sbi->ll_stats_track_id ==
1149                         from_kgid(&init_user_ns, current_gid()))
1150                 lprocfs_counter_add(sbi->ll_stats, op, count);
1151 }
1152 EXPORT_SYMBOL(ll_stats_ops_tally);
1153
1154 static const char *ra_stat_string[] = {
1155         [RA_STAT_HIT] = "hits",
1156         [RA_STAT_MISS] = "misses",
1157         [RA_STAT_DISTANT_READPAGE] = "readpage not consecutive",
1158         [RA_STAT_MISS_IN_WINDOW] = "miss inside window",
1159         [RA_STAT_FAILED_GRAB_PAGE] = "failed grab_cache_page",
1160         [RA_STAT_FAILED_MATCH] = "failed lock match",
1161         [RA_STAT_DISCARDED] = "read but discarded",
1162         [RA_STAT_ZERO_LEN] = "zero length file",
1163         [RA_STAT_ZERO_WINDOW] = "zero size window",
1164         [RA_STAT_EOF] = "read-ahead to EOF",
1165         [RA_STAT_MAX_IN_FLIGHT] = "hit max r-a issue",
1166         [RA_STAT_WRONG_GRAB_PAGE] = "wrong page from grab_cache_page",
1167         [RA_STAT_FAILED_REACH_END] = "failed to reach end"
1168 };
1169
1170 LPROC_SEQ_FOPS_RO_TYPE(llite, name);
1171 LPROC_SEQ_FOPS_RO_TYPE(llite, uuid);
1172
1173 int lprocfs_register_mountpoint(struct proc_dir_entry *parent,
1174                                 struct super_block *sb, char *osc, char *mdc)
1175 {
1176         struct lprocfs_vars lvars[2];
1177         struct lustre_sb_info *lsi = s2lsi(sb);
1178         struct ll_sb_info *sbi = ll_s2sbi(sb);
1179         struct obd_device *obd;
1180         struct proc_dir_entry *dir;
1181         char name[MAX_STRING_SIZE + 1], *ptr;
1182         int err, id, len, rc;
1183         ENTRY;
1184
1185         memset(lvars, 0, sizeof(lvars));
1186
1187         name[MAX_STRING_SIZE] = '\0';
1188         lvars[0].name = name;
1189
1190         LASSERT(sbi != NULL);
1191         LASSERT(mdc != NULL);
1192         LASSERT(osc != NULL);
1193
1194         /* Get fsname */
1195         len = strlen(lsi->lsi_lmd->lmd_profile);
1196         ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
1197         if (ptr && (strcmp(ptr, "-client") == 0))
1198                 len -= 7;
1199
1200         /* Mount info */
1201         snprintf(name, MAX_STRING_SIZE, "%.*s-%p", len,
1202                  lsi->lsi_lmd->lmd_profile, sb);
1203
1204         sbi->ll_proc_root = lprocfs_register(name, parent, NULL, NULL);
1205         if (IS_ERR(sbi->ll_proc_root)) {
1206                 err = PTR_ERR(sbi->ll_proc_root);
1207                 sbi->ll_proc_root = NULL;
1208                 RETURN(err);
1209         }
1210
1211         rc = lprocfs_seq_create(sbi->ll_proc_root, "dump_page_cache", 0444,
1212                                 &vvp_dump_pgcache_file_ops, sbi);
1213         if (rc)
1214                 CWARN("Error adding the dump_page_cache file\n");
1215
1216         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats", 0644,
1217                                 &ll_rw_extents_stats_fops, sbi);
1218         if (rc)
1219                 CWARN("Error adding the extent_stats file\n");
1220
1221         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats_per_process",
1222                                 0644, &ll_rw_extents_stats_pp_fops, sbi);
1223         if (rc)
1224                 CWARN("Error adding the extents_stats_per_process file\n");
1225
1226         rc = lprocfs_seq_create(sbi->ll_proc_root, "offset_stats", 0644,
1227                                 &ll_rw_offset_stats_fops, sbi);
1228         if (rc)
1229                 CWARN("Error adding the offset_stats file\n");
1230
1231         /* File operations stats */
1232         sbi->ll_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES,
1233                                             LPROCFS_STATS_FLAG_NONE);
1234         if (sbi->ll_stats == NULL)
1235                 GOTO(out, err = -ENOMEM);
1236         /* do counter init */
1237         for (id = 0; id < LPROC_LL_FILE_OPCODES; id++) {
1238                 __u32 type = llite_opcode_table[id].type;
1239                 void *ptr = NULL;
1240                 if (type & LPROCFS_TYPE_REGS)
1241                         ptr = "regs";
1242                 else if (type & LPROCFS_TYPE_BYTES)
1243                         ptr = "bytes";
1244                 else if (type & LPROCFS_TYPE_PAGES)
1245                         ptr = "pages";
1246                 lprocfs_counter_init(sbi->ll_stats,
1247                                      llite_opcode_table[id].opcode,
1248                                      (type & LPROCFS_CNTR_AVGMINMAX),
1249                                      llite_opcode_table[id].opname, ptr);
1250         }
1251         err = lprocfs_register_stats(sbi->ll_proc_root, "stats", sbi->ll_stats);
1252         if (err)
1253                 GOTO(out, err);
1254
1255         sbi->ll_ra_stats = lprocfs_alloc_stats(ARRAY_SIZE(ra_stat_string),
1256                                                LPROCFS_STATS_FLAG_NONE);
1257         if (sbi->ll_ra_stats == NULL)
1258                 GOTO(out, err = -ENOMEM);
1259
1260         for (id = 0; id < ARRAY_SIZE(ra_stat_string); id++)
1261                 lprocfs_counter_init(sbi->ll_ra_stats, id, 0,
1262                                      ra_stat_string[id], "pages");
1263         err = lprocfs_register_stats(sbi->ll_proc_root, "read_ahead_stats",
1264                                      sbi->ll_ra_stats);
1265         if (err)
1266                 GOTO(out, err);
1267
1268
1269         err = lprocfs_add_vars(sbi->ll_proc_root, lprocfs_llite_obd_vars, sb);
1270         if (err)
1271                 GOTO(out, err);
1272
1273         /* MDC info */
1274         obd = class_name2obd(mdc);
1275
1276         LASSERT(obd != NULL);
1277         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1278         LASSERT(obd->obd_type->typ_name != NULL);
1279
1280         dir = proc_mkdir(obd->obd_type->typ_name, sbi->ll_proc_root);
1281         if (dir == NULL)
1282                 GOTO(out, err = -ENOMEM);
1283
1284         snprintf(name, MAX_STRING_SIZE, "common_name");
1285         lvars[0].fops = &llite_name_fops;
1286         err = lprocfs_add_vars(dir, lvars, obd);
1287         if (err)
1288                 GOTO(out, err);
1289
1290         snprintf(name, MAX_STRING_SIZE, "uuid");
1291         lvars[0].fops = &llite_uuid_fops;
1292         err = lprocfs_add_vars(dir, lvars, obd);
1293         if (err)
1294                 GOTO(out, err);
1295
1296         /* OSC */
1297         obd = class_name2obd(osc);
1298
1299         LASSERT(obd != NULL);
1300         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1301         LASSERT(obd->obd_type->typ_name != NULL);
1302
1303         dir = proc_mkdir(obd->obd_type->typ_name, sbi->ll_proc_root);
1304         if (dir == NULL)
1305                 GOTO(out, err = -ENOMEM);
1306
1307         snprintf(name, MAX_STRING_SIZE, "common_name");
1308         lvars[0].fops = &llite_name_fops;
1309         err = lprocfs_add_vars(dir, lvars, obd);
1310         if (err)
1311                 GOTO(out, err);
1312
1313         snprintf(name, MAX_STRING_SIZE, "uuid");
1314         lvars[0].fops = &llite_uuid_fops;
1315         err = lprocfs_add_vars(dir, lvars, obd);
1316 out:
1317         if (err) {
1318                 lprocfs_remove(&sbi->ll_proc_root);
1319                 lprocfs_free_stats(&sbi->ll_ra_stats);
1320                 lprocfs_free_stats(&sbi->ll_stats);
1321         }
1322         RETURN(err);
1323 }
1324
1325 void lprocfs_unregister_mountpoint(struct ll_sb_info *sbi)
1326 {
1327         if (sbi->ll_proc_root) {
1328                 lprocfs_remove(&sbi->ll_proc_root);
1329                 lprocfs_free_stats(&sbi->ll_ra_stats);
1330                 lprocfs_free_stats(&sbi->ll_stats);
1331         }
1332 }
1333 #undef MAX_STRING_SIZE
1334
1335 #define pct(a,b) (b ? a * 100 / b : 0)
1336
1337 static void ll_display_extents_info(struct ll_rw_extents_info *io_extents,
1338                                    struct seq_file *seq, int which)
1339 {
1340         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
1341         unsigned long start, end, r, w;
1342         char *unitp = "KMGTPEZY";
1343         int i, units = 10;
1344         struct per_process_info *pp_info = &io_extents->pp_extents[which];
1345
1346         read_cum = 0;
1347         write_cum = 0;
1348         start = 0;
1349
1350         for(i = 0; i < LL_HIST_MAX; i++) {
1351                 read_tot += pp_info->pp_r_hist.oh_buckets[i];
1352                 write_tot += pp_info->pp_w_hist.oh_buckets[i];
1353         }
1354
1355         for(i = 0; i < LL_HIST_MAX; i++) {
1356                 r = pp_info->pp_r_hist.oh_buckets[i];
1357                 w = pp_info->pp_w_hist.oh_buckets[i];
1358                 read_cum += r;
1359                 write_cum += w;
1360                 end = 1 << (i + LL_HIST_START - units);
1361                 seq_printf(seq, "%4lu%c - %4lu%c%c: %14lu %4lu %4lu  | "
1362                            "%14lu %4lu %4lu\n", start, *unitp, end, *unitp,
1363                            (i == LL_HIST_MAX - 1) ? '+' : ' ',
1364                            r, pct(r, read_tot), pct(read_cum, read_tot),
1365                            w, pct(w, write_tot), pct(write_cum, write_tot));
1366                 start = end;
1367                 if (start == 1<<10) {
1368                         start = 1;
1369                         units += 10;
1370                         unitp++;
1371                 }
1372                 if (read_cum == read_tot && write_cum == write_tot)
1373                         break;
1374         }
1375 }
1376
1377 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
1378 {
1379         struct timeval now;
1380         struct ll_sb_info *sbi = seq->private;
1381         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1382         int k;
1383
1384         do_gettimeofday(&now);
1385
1386         if (!sbi->ll_rw_stats_on) {
1387                 seq_puts(seq, "disabled\n write anything in this file to activate, then 0 or \[D/d]isabled\" to deactivate\n");
1388                 return 0;
1389         }
1390         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
1391                    now.tv_sec, now.tv_usec);
1392         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1393         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1394                    "extents", "calls", "%", "cum%",
1395                    "calls", "%", "cum%");
1396         spin_lock(&sbi->ll_pp_extent_lock);
1397         for (k = 0; k < LL_PROCESS_HIST_MAX; k++) {
1398                 if (io_extents->pp_extents[k].pid != 0) {
1399                         seq_printf(seq, "\nPID: %d\n",
1400                                    io_extents->pp_extents[k].pid);
1401                         ll_display_extents_info(io_extents, seq, k);
1402                 }
1403         }
1404         spin_unlock(&sbi->ll_pp_extent_lock);
1405         return 0;
1406 }
1407
1408 static ssize_t ll_rw_extents_stats_pp_seq_write(struct file *file,
1409                                                 const char __user *buf,
1410                                                 size_t len,
1411                                                 loff_t *off)
1412 {
1413         struct seq_file *seq = file->private_data;
1414         struct ll_sb_info *sbi = seq->private;
1415         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1416         int i;
1417         __s64 value = 1;
1418         int rc = 0;
1419
1420         if (len == 0)
1421                 return -EINVAL;
1422
1423         rc = lprocfs_str_to_s64(buf, len, &value);
1424         if (rc < 0 && len < 16) {
1425                 char kernbuf[16];
1426
1427                 if (copy_from_user(kernbuf, buf, len))
1428                         return -EFAULT;
1429                 kernbuf[len] = 0;
1430
1431                 if (kernbuf[len - 1] == '\n')
1432                         kernbuf[len - 1] = 0;
1433
1434                 if (strcmp(kernbuf, "disabled") == 0 ||
1435                     strcmp(kernbuf, "Disabled") == 0)
1436                         value = 0;
1437         }
1438
1439         if (value == 0)
1440                 sbi->ll_rw_stats_on = 0;
1441         else
1442                 sbi->ll_rw_stats_on = 1;
1443
1444         spin_lock(&sbi->ll_pp_extent_lock);
1445         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1446                 io_extents->pp_extents[i].pid = 0;
1447                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1448                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1449         }
1450         spin_unlock(&sbi->ll_pp_extent_lock);
1451         return len;
1452 }
1453
1454 LPROC_SEQ_FOPS(ll_rw_extents_stats_pp);
1455
1456 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
1457 {
1458         struct timeval now;
1459         struct ll_sb_info *sbi = seq->private;
1460         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1461
1462         do_gettimeofday(&now);
1463
1464         if (!sbi->ll_rw_stats_on) {
1465                 seq_puts(seq, "disabled\n write anything in this file to activate, then 0 or \"[D/d]isabled\" to deactivate\n");
1466                 return 0;
1467         }
1468         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
1469                    now.tv_sec, now.tv_usec);
1470
1471         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1472         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1473                    "extents", "calls", "%", "cum%",
1474                    "calls", "%", "cum%");
1475         spin_lock(&sbi->ll_lock);
1476         ll_display_extents_info(io_extents, seq, LL_PROCESS_HIST_MAX);
1477         spin_unlock(&sbi->ll_lock);
1478
1479         return 0;
1480 }
1481
1482 static ssize_t ll_rw_extents_stats_seq_write(struct file *file,
1483                                              const char __user *buf,
1484                                              size_t len, loff_t *off)
1485 {
1486         struct seq_file *seq = file->private_data;
1487         struct ll_sb_info *sbi = seq->private;
1488         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1489         int i;
1490         __s64 value = 1;
1491         int rc = 0;
1492
1493         if (len == 0)
1494                 return -EINVAL;
1495
1496         rc = lprocfs_str_to_s64(buf, len, &value);
1497         if (rc < 0 && len < 16) {
1498                 char kernbuf[16];
1499
1500                 if (copy_from_user(kernbuf, buf, len))
1501                         return -EFAULT;
1502                 kernbuf[len] = 0;
1503
1504                 if (kernbuf[len - 1] == '\n')
1505                         kernbuf[len - 1] = 0;
1506
1507                 if (strcmp(kernbuf, "disabled") == 0 ||
1508                     strcmp(kernbuf, "Disabled") == 0)
1509                         value = 0;
1510         }
1511
1512         if (value == 0)
1513                 sbi->ll_rw_stats_on = 0;
1514         else
1515                 sbi->ll_rw_stats_on = 1;
1516
1517         spin_lock(&sbi->ll_pp_extent_lock);
1518         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
1519                 io_extents->pp_extents[i].pid = 0;
1520                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1521                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1522         }
1523         spin_unlock(&sbi->ll_pp_extent_lock);
1524
1525         return len;
1526 }
1527 LPROC_SEQ_FOPS(ll_rw_extents_stats);
1528
1529 void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
1530                        struct ll_file_data *file, loff_t pos,
1531                        size_t count, int rw)
1532 {
1533         int i, cur = -1;
1534         struct ll_rw_process_info *process;
1535         struct ll_rw_process_info *offset;
1536         int *off_count = &sbi->ll_rw_offset_entry_count;
1537         int *process_count = &sbi->ll_offset_process_count;
1538         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1539
1540         if(!sbi->ll_rw_stats_on)
1541                 return;
1542         process = sbi->ll_rw_process_info;
1543         offset = sbi->ll_rw_offset_info;
1544
1545         spin_lock(&sbi->ll_pp_extent_lock);
1546         /* Extent statistics */
1547         for(i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1548                 if(io_extents->pp_extents[i].pid == pid) {
1549                         cur = i;
1550                         break;
1551                 }
1552         }
1553
1554         if (cur == -1) {
1555                 /* new process */
1556                 sbi->ll_extent_process_count =
1557                         (sbi->ll_extent_process_count + 1) % LL_PROCESS_HIST_MAX;
1558                 cur = sbi->ll_extent_process_count;
1559                 io_extents->pp_extents[cur].pid = pid;
1560                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_r_hist);
1561                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_w_hist);
1562         }
1563
1564         for(i = 0; (count >= (1 << LL_HIST_START << i)) &&
1565              (i < (LL_HIST_MAX - 1)); i++);
1566         if (rw == 0) {
1567                 io_extents->pp_extents[cur].pp_r_hist.oh_buckets[i]++;
1568                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_r_hist.oh_buckets[i]++;
1569         } else {
1570                 io_extents->pp_extents[cur].pp_w_hist.oh_buckets[i]++;
1571                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_w_hist.oh_buckets[i]++;
1572         }
1573         spin_unlock(&sbi->ll_pp_extent_lock);
1574
1575         spin_lock(&sbi->ll_process_lock);
1576         /* Offset statistics */
1577         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1578                 if (process[i].rw_pid == pid) {
1579                         if (process[i].rw_last_file != file) {
1580                                 process[i].rw_range_start = pos;
1581                                 process[i].rw_last_file_pos = pos + count;
1582                                 process[i].rw_smallest_extent = count;
1583                                 process[i].rw_largest_extent = count;
1584                                 process[i].rw_offset = 0;
1585                                 process[i].rw_last_file = file;
1586                                 spin_unlock(&sbi->ll_process_lock);
1587                                 return;
1588                         }
1589                         if (process[i].rw_last_file_pos != pos) {
1590                                 *off_count =
1591                                     (*off_count + 1) % LL_OFFSET_HIST_MAX;
1592                                 offset[*off_count].rw_op = process[i].rw_op;
1593                                 offset[*off_count].rw_pid = pid;
1594                                 offset[*off_count].rw_range_start =
1595                                         process[i].rw_range_start;
1596                                 offset[*off_count].rw_range_end =
1597                                         process[i].rw_last_file_pos;
1598                                 offset[*off_count].rw_smallest_extent =
1599                                         process[i].rw_smallest_extent;
1600                                 offset[*off_count].rw_largest_extent =
1601                                         process[i].rw_largest_extent;
1602                                 offset[*off_count].rw_offset =
1603                                         process[i].rw_offset;
1604                                 process[i].rw_op = rw;
1605                                 process[i].rw_range_start = pos;
1606                                 process[i].rw_smallest_extent = count;
1607                                 process[i].rw_largest_extent = count;
1608                                 process[i].rw_offset = pos -
1609                                         process[i].rw_last_file_pos;
1610                         }
1611                         if(process[i].rw_smallest_extent > count)
1612                                 process[i].rw_smallest_extent = count;
1613                         if(process[i].rw_largest_extent < count)
1614                                 process[i].rw_largest_extent = count;
1615                         process[i].rw_last_file_pos = pos + count;
1616                         spin_unlock(&sbi->ll_process_lock);
1617                         return;
1618                 }
1619         }
1620         *process_count = (*process_count + 1) % LL_PROCESS_HIST_MAX;
1621         process[*process_count].rw_pid = pid;
1622         process[*process_count].rw_op = rw;
1623         process[*process_count].rw_range_start = pos;
1624         process[*process_count].rw_last_file_pos = pos + count;
1625         process[*process_count].rw_smallest_extent = count;
1626         process[*process_count].rw_largest_extent = count;
1627         process[*process_count].rw_offset = 0;
1628         process[*process_count].rw_last_file = file;
1629         spin_unlock(&sbi->ll_process_lock);
1630 }
1631
1632 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
1633 {
1634         struct timeval now;
1635         struct ll_sb_info *sbi = seq->private;
1636         struct ll_rw_process_info *offset = sbi->ll_rw_offset_info;
1637         struct ll_rw_process_info *process = sbi->ll_rw_process_info;
1638         int i;
1639
1640         do_gettimeofday(&now);
1641
1642         if (!sbi->ll_rw_stats_on) {
1643                 seq_puts(seq, "disabled\n write anything in this file to activate, then 0 or \"[D/d]isabled\" to deactivate\n");
1644                 return 0;
1645         }
1646         spin_lock(&sbi->ll_process_lock);
1647
1648         seq_printf(seq, "snapshot_time:         %lu.%lu (secs.usecs)\n",
1649                    now.tv_sec, now.tv_usec);
1650         seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
1651                    "R/W", "PID", "RANGE START", "RANGE END",
1652                    "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");
1653
1654         /* We stored the discontiguous offsets here; print them first */
1655         for (i = 0; i < LL_OFFSET_HIST_MAX; i++) {
1656                 if (offset[i].rw_pid != 0)
1657                         seq_printf(seq,
1658                                    "%3c %10d %14Lu %14Lu %17lu %17lu %14Lu",
1659                                    offset[i].rw_op == READ ? 'R' : 'W',
1660                                    offset[i].rw_pid,
1661                                    offset[i].rw_range_start,
1662                                    offset[i].rw_range_end,
1663                                    (unsigned long)offset[i].rw_smallest_extent,
1664                                    (unsigned long)offset[i].rw_largest_extent,
1665                                    offset[i].rw_offset);
1666         }
1667
1668         /* Then print the current offsets for each process */
1669         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1670                 if (process[i].rw_pid != 0)
1671                         seq_printf(seq,
1672                                    "%3c %10d %14Lu %14Lu %17lu %17lu %14Lu",
1673                                    process[i].rw_op == READ ? 'R' : 'W',
1674                                    process[i].rw_pid,
1675                                    process[i].rw_range_start,
1676                                    process[i].rw_last_file_pos,
1677                                    (unsigned long)process[i].rw_smallest_extent,
1678                                    (unsigned long)process[i].rw_largest_extent,
1679                                    process[i].rw_offset);
1680         }
1681         spin_unlock(&sbi->ll_process_lock);
1682
1683         return 0;
1684 }
1685
1686 static ssize_t ll_rw_offset_stats_seq_write(struct file *file,
1687                                             const char __user *buf,
1688                                             size_t len, loff_t *off)
1689 {
1690         struct seq_file *seq = file->private_data;
1691         struct ll_sb_info *sbi = seq->private;
1692         struct ll_rw_process_info *process_info = sbi->ll_rw_process_info;
1693         struct ll_rw_process_info *offset_info = sbi->ll_rw_offset_info;
1694         __s64 value = 1;
1695         int rc = 0;
1696
1697         if (len == 0)
1698                 return -EINVAL;
1699
1700         rc = lprocfs_str_to_s64(buf, len, &value);
1701
1702         if (rc < 0 && len < 16) {
1703                 char kernbuf[16];
1704
1705                 if (copy_from_user(kernbuf, buf, len))
1706                         return -EFAULT;
1707                 kernbuf[len] = 0;
1708
1709                 if (kernbuf[len - 1] == '\n')
1710                         kernbuf[len - 1] = 0;
1711
1712                 if (strcmp(kernbuf, "disabled") == 0 ||
1713                     strcmp(kernbuf, "Disabled") == 0)
1714                         value = 0;
1715         }
1716
1717         if (value == 0)
1718                 sbi->ll_rw_stats_on = 0;
1719         else
1720                 sbi->ll_rw_stats_on = 1;
1721
1722         spin_lock(&sbi->ll_process_lock);
1723         sbi->ll_offset_process_count = 0;
1724         sbi->ll_rw_offset_entry_count = 0;
1725         memset(process_info, 0, sizeof(struct ll_rw_process_info) *
1726                LL_PROCESS_HIST_MAX);
1727         memset(offset_info, 0, sizeof(struct ll_rw_process_info) *
1728                LL_OFFSET_HIST_MAX);
1729         spin_unlock(&sbi->ll_process_lock);
1730
1731         return len;
1732 }
1733
1734 LPROC_SEQ_FOPS(ll_rw_offset_stats);
1735 #endif /* CONFIG_PROC_FS */