lustre/llite/lproc_llite.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32 #define DEBUG_SUBSYSTEM S_LLITE
  33
  34 #include <linux/version.h>
  35 #include <linux/user_namespace.h>
  36 #ifdef HAVE_UIDGID_HEADER
  37 # include <linux/uidgid.h>
  38 #endif
  39 #include <uapi/linux/lustre/lustre_param.h>
  40 #include <lprocfs_status.h>
  41 #include <obd_support.h>
  42
  43 #include "llite_internal.h"
  44 #include "vvp_internal.h"
  45
  46 struct proc_dir_entry *proc_lustre_fs_root;
  47 static struct kobject *llite_kobj;
  48
  49 int llite_tunables_register(void)
  50 {
  51         int rc = 0;
  52
  53         proc_lustre_fs_root = lprocfs_register("llite", proc_lustre_root,
  54                                                NULL, NULL);
  55         if (IS_ERR(proc_lustre_fs_root)) {
  56                 rc = PTR_ERR(proc_lustre_fs_root);
  57                 CERROR("cannot register '/proc/fs/lustre/llite': rc = %d\n",
  58                        rc);
  59                 proc_lustre_fs_root = NULL;
  60                 return rc;
  61         }
  62
  63         llite_kobj = class_setup_tunables("llite");
  64         if (IS_ERR(llite_kobj)) {
  65                 rc = PTR_ERR(llite_kobj);
  66                 llite_kobj = NULL;
  67         }
  68
  69         return rc;
  70 }
  71
  72 void llite_tunables_unregister(void)
  73 {
  74         if (llite_kobj)
  75                 kobject_put(llite_kobj);
  76
  77         lprocfs_remove(&proc_lustre_fs_root);
  78 }
  79
  80 #ifdef CONFIG_PROC_FS
  81 /* /proc/lustre/llite mount point registration */
  82 static const struct file_operations ll_rw_extents_stats_fops;
  83 static const struct file_operations ll_rw_extents_stats_pp_fops;
  84 static const struct file_operations ll_rw_offset_stats_fops;
  85 static __s64 ll_stats_pid_write(const char __user *buf, size_t len);
  86
  87 static ssize_t blocksize_show(struct kobject *kobj, struct attribute *attr,
  88                               char *buf)
  89 {
  90         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
  91                                               ll_kset.kobj);
  92         struct obd_statfs osfs;
  93         int rc;
  94
  95         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
  96         if (rc)
  97                 return rc;
  98
  99         return sprintf(buf, "%u\n", osfs.os_bsize);
 100 }
 101 LUSTRE_RO_ATTR(blocksize);
 102
 103 static int ll_stat_blksize_seq_show(struct seq_file *m, void *v)
 104 {
 105         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 106
 107         seq_printf(m, "%u\n", sbi->ll_stat_blksize);
 108
 109         return 0;
 110 }
 111
 112 static ssize_t ll_stat_blksize_seq_write(struct file *file,
 113                                          const char __user *buffer,
 114                                          size_t count, loff_t *off)
 115 {
 116         struct seq_file *m = file->private_data;
 117         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)m->private);
 118         unsigned int val;
 119         int rc;
 120
 121         rc = kstrtouint_from_user(buffer, count, 0, &val);
 122         if (rc)
 123                 return rc;
 124
 125         if (val != 0 && (val < PAGE_SIZE || (val & (val - 1))) != 0)
 126                 return -ERANGE;
 127
 128         sbi->ll_stat_blksize = val;
 129
 130         return count;
 131 }
 132 LPROC_SEQ_FOPS(ll_stat_blksize);
 133
 134 static ssize_t kbytestotal_show(struct kobject *kobj, struct attribute *attr,
 135                                 char *buf)
 136 {
 137         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 138                                               ll_kset.kobj);
 139         struct obd_statfs osfs;
 140         u32 blk_size;
 141         u64 result;
 142         int rc;
 143
 144         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 145         if (rc)
 146                 return rc;
 147
 148         blk_size = osfs.os_bsize >> 10;
 149         result = osfs.os_blocks;
 150
 151         while (blk_size >>= 1)
 152                 result <<= 1;
 153
 154         return sprintf(buf, "%llu\n", result);
 155 }
 156 LUSTRE_RO_ATTR(kbytestotal);
 157
 158 static ssize_t kbytesfree_show(struct kobject *kobj, struct attribute *attr,
 159                                char *buf)
 160 {
 161         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 162                                               ll_kset.kobj);
 163         struct obd_statfs osfs;
 164         u32 blk_size;
 165         u64 result;
 166         int rc;
 167
 168         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 169         if (rc)
 170                 return rc;
 171
 172         blk_size = osfs.os_bsize >> 10;
 173         result = osfs.os_bfree;
 174
 175         while (blk_size >>= 1)
 176                 result <<= 1;
 177
 178         return sprintf(buf, "%llu\n", result);
 179 }
 180 LUSTRE_RO_ATTR(kbytesfree);
 181
 182 static ssize_t kbytesavail_show(struct kobject *kobj, struct attribute *attr,
 183                                 char *buf)
 184 {
 185         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 186                                               ll_kset.kobj);
 187         struct obd_statfs osfs;
 188         u32 blk_size;
 189         u64 result;
 190         int rc;
 191
 192         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 193         if (rc)
 194                 return rc;
 195
 196         blk_size = osfs.os_bsize >> 10;
 197         result = osfs.os_bavail;
 198
 199         while (blk_size >>= 1)
 200                 result <<= 1;
 201
 202         return sprintf(buf, "%llu\n", result);
 203 }
 204 LUSTRE_RO_ATTR(kbytesavail);
 205
 206 static ssize_t filestotal_show(struct kobject *kobj, struct attribute *attr,
 207                                char *buf)
 208 {
 209         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 210                                               ll_kset.kobj);
 211         struct obd_statfs osfs;
 212         int rc;
 213
 214         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 215         if (rc)
 216                 return rc;
 217
 218         return sprintf(buf, "%llu\n", osfs.os_files);
 219 }
 220 LUSTRE_RO_ATTR(filestotal);
 221
 222 static ssize_t filesfree_show(struct kobject *kobj, struct attribute *attr,
 223                               char *buf)
 224 {
 225         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 226                                               ll_kset.kobj);
 227         struct obd_statfs osfs;
 228         int rc;
 229
 230         rc = ll_statfs_internal(sbi, &osfs, OBD_STATFS_NODELAY);
 231         if (rc)
 232                 return rc;
 233
 234         return sprintf(buf, "%llu\n", osfs.os_ffree);
 235 }
 236 LUSTRE_RO_ATTR(filesfree);
 237
 238 static ssize_t client_type_show(struct kobject *kobj, struct attribute *attr,
 239                                 char *buf)
 240 {
 241         return sprintf(buf, "local client\n");
 242 }
 243 LUSTRE_RO_ATTR(client_type);
 244
 245 static ssize_t fstype_show(struct kobject *kobj, struct attribute *attr,
 246                            char *buf)
 247 {
 248         return sprintf(buf, "lustre\n");
 249 }
 250 LUSTRE_RO_ATTR(fstype);
 251
 252 static ssize_t uuid_show(struct kobject *kobj, struct attribute *attr,
 253                          char *buf)
 254 {
 255         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 256                                               ll_kset.kobj);
 257
 258         return sprintf(buf, "%s\n", sbi->ll_sb_uuid.uuid);
 259 }
 260 LUSTRE_RO_ATTR(uuid);
 261
 262 static int ll_site_stats_seq_show(struct seq_file *m, void *v)
 263 {
 264         struct super_block *sb = m->private;
 265
 266         /*
 267          * See description of statistical counters in struct cl_site, and
 268          * struct lu_site.
 269          */
 270         return cl_site_stats_print(lu2cl_site(ll_s2sbi(sb)->ll_site), m);
 271 }
 272 LPROC_SEQ_FOPS_RO(ll_site_stats);
 273
 274 static int ll_max_readahead_mb_seq_show(struct seq_file *m, void *v)
 275 {
 276         struct super_block *sb = m->private;
 277         struct ll_sb_info *sbi = ll_s2sbi(sb);
 278         long pages_number;
 279         int mult;
 280
 281         spin_lock(&sbi->ll_lock);
 282         pages_number = sbi->ll_ra_info.ra_max_pages;
 283         spin_unlock(&sbi->ll_lock);
 284
 285         mult = 1 << (20 - PAGE_SHIFT);
 286         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 287 }
 288
 289 static ssize_t
 290 ll_max_readahead_mb_seq_write(struct file *file, const char __user *buffer,
 291                               size_t count, loff_t *off)
 292 {
 293         struct seq_file *m = file->private_data;
 294         struct super_block *sb = m->private;
 295         struct ll_sb_info *sbi = ll_s2sbi(sb);
 296         __s64 pages_number;
 297         int rc;
 298
 299         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 300         if (rc)
 301                 return rc;
 302
 303         pages_number >>= PAGE_SHIFT;
 304
 305         if (pages_number < 0 || pages_number > totalram_pages / 2) {
 306                 /* 1/2 of RAM */
 307                 CERROR("%s: can't set max_readahead_mb=%lu > %luMB\n",
 308                        ll_get_fsname(sb, NULL, 0),
 309                        (unsigned long)pages_number >> (20 - PAGE_SHIFT),
 310                        totalram_pages >> (20 - PAGE_SHIFT + 1));
 311                 return -ERANGE;
 312         }
 313
 314         spin_lock(&sbi->ll_lock);
 315         sbi->ll_ra_info.ra_max_pages = pages_number;
 316         spin_unlock(&sbi->ll_lock);
 317         return count;
 318 }
 319 LPROC_SEQ_FOPS(ll_max_readahead_mb);
 320
 321 static int ll_max_readahead_per_file_mb_seq_show(struct seq_file *m, void *v)
 322 {
 323         struct super_block *sb = m->private;
 324         struct ll_sb_info *sbi = ll_s2sbi(sb);
 325         long pages_number;
 326         int mult;
 327
 328         spin_lock(&sbi->ll_lock);
 329         pages_number = sbi->ll_ra_info.ra_max_pages_per_file;
 330         spin_unlock(&sbi->ll_lock);
 331
 332         mult = 1 << (20 - PAGE_SHIFT);
 333         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 334 }
 335
 336 static ssize_t
 337 ll_max_readahead_per_file_mb_seq_write(struct file *file,
 338                                        const char __user *buffer,
 339                                        size_t count, loff_t *off)
 340 {
 341         struct seq_file *m = file->private_data;
 342         struct super_block *sb = m->private;
 343         struct ll_sb_info *sbi = ll_s2sbi(sb);
 344         int rc;
 345         __s64 pages_number;
 346
 347         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 348         if (rc)
 349                 return rc;
 350
 351         pages_number >>= PAGE_SHIFT;
 352
 353         if (pages_number < 0 || pages_number > sbi->ll_ra_info.ra_max_pages) {
 354                 CERROR("%s: can't set max_readahead_per_file_mb=%lu > "
 355                        "max_read_ahead_mb=%lu\n", ll_get_fsname(sb, NULL, 0),
 356                        (unsigned long)pages_number >> (20 - PAGE_SHIFT),
 357                        sbi->ll_ra_info.ra_max_pages >> (20 - PAGE_SHIFT));
 358                 return -ERANGE;
 359         }
 360
 361         spin_lock(&sbi->ll_lock);
 362         sbi->ll_ra_info.ra_max_pages_per_file = pages_number;
 363         spin_unlock(&sbi->ll_lock);
 364         return count;
 365 }
 366 LPROC_SEQ_FOPS(ll_max_readahead_per_file_mb);
 367
 368 static int ll_max_read_ahead_whole_mb_seq_show(struct seq_file *m, void *v)
 369 {
 370         struct super_block *sb = m->private;
 371         struct ll_sb_info *sbi = ll_s2sbi(sb);
 372         long pages_number;
 373         int mult;
 374
 375         spin_lock(&sbi->ll_lock);
 376         pages_number = sbi->ll_ra_info.ra_max_read_ahead_whole_pages;
 377         spin_unlock(&sbi->ll_lock);
 378
 379         mult = 1 << (20 - PAGE_SHIFT);
 380         return lprocfs_seq_read_frac_helper(m, pages_number, mult);
 381 }
 382
 383 static ssize_t
 384 ll_max_read_ahead_whole_mb_seq_write(struct file *file,
 385                                      const char __user *buffer,
 386                                      size_t count, loff_t *off)
 387 {
 388         struct seq_file *m = file->private_data;
 389         struct super_block *sb = m->private;
 390         struct ll_sb_info *sbi = ll_s2sbi(sb);
 391         int rc;
 392         __s64 pages_number;
 393
 394         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 395         if (rc)
 396                 return rc;
 397
 398         pages_number >>= PAGE_SHIFT;
 399
 400         /* Cap this at the current max readahead window size, the readahead
 401          * algorithm does this anyway so it's pointless to set it larger. */
 402         if (pages_number < 0 ||
 403             pages_number > sbi->ll_ra_info.ra_max_pages_per_file) {
 404                 int pages_shift = 20 - PAGE_SHIFT;
 405                 CERROR("%s: can't set max_read_ahead_whole_mb=%lu > "
 406                        "max_read_ahead_per_file_mb=%lu\n",
 407                        ll_get_fsname(sb, NULL, 0),
 408                        (unsigned long)pages_number >> pages_shift,
 409                        sbi->ll_ra_info.ra_max_pages_per_file >> pages_shift);
 410                 return -ERANGE;
 411         }
 412
 413         spin_lock(&sbi->ll_lock);
 414         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = pages_number;
 415         spin_unlock(&sbi->ll_lock);
 416         return count;
 417 }
 418 LPROC_SEQ_FOPS(ll_max_read_ahead_whole_mb);
 419
 420 static int ll_max_cached_mb_seq_show(struct seq_file *m, void *v)
 421 {
 422         struct super_block     *sb    = m->private;
 423         struct ll_sb_info      *sbi   = ll_s2sbi(sb);
 424         struct cl_client_cache *cache = sbi->ll_cache;
 425         int shift = 20 - PAGE_SHIFT;
 426         long max_cached_mb;
 427         long unused_mb;
 428
 429         max_cached_mb = cache->ccc_lru_max >> shift;
 430         unused_mb = atomic_long_read(&cache->ccc_lru_left) >> shift;
 431         seq_printf(m, "users: %d\n"
 432                    "max_cached_mb: %ld\n"
 433                    "used_mb: %ld\n"
 434                    "unused_mb: %ld\n"
 435                    "reclaim_count: %u\n",
 436                    atomic_read(&cache->ccc_users),
 437                    max_cached_mb,
 438                    max_cached_mb - unused_mb,
 439                    unused_mb,
 440                    cache->ccc_lru_shrinkers);
 441         return 0;
 442 }
 443
 444 static ssize_t
 445 ll_max_cached_mb_seq_write(struct file *file, const char __user *buffer,
 446                            size_t count, loff_t *off)
 447 {
 448         struct seq_file *m = file->private_data;
 449         struct super_block *sb = m->private;
 450         struct ll_sb_info *sbi = ll_s2sbi(sb);
 451         struct cl_client_cache *cache = sbi->ll_cache;
 452         struct lu_env *env;
 453         long diff = 0;
 454         long nrpages = 0;
 455         __u16 refcheck;
 456         __s64 pages_number;
 457         long rc;
 458         char kernbuf[128];
 459         ENTRY;
 460
 461         if (count >= sizeof(kernbuf))
 462                 RETURN(-EINVAL);
 463
 464         if (copy_from_user(kernbuf, buffer, count))
 465                 RETURN(-EFAULT);
 466         kernbuf[count] = 0;
 467
 468         buffer += lprocfs_find_named_value(kernbuf, "max_cached_mb:", &count) -
 469                   kernbuf;
 470         rc = lprocfs_str_with_units_to_s64(buffer, count, &pages_number, 'M');
 471         if (rc)
 472                 RETURN(rc);
 473
 474         pages_number >>= PAGE_SHIFT;
 475
 476         if (pages_number < 0 || pages_number > totalram_pages) {
 477                 CERROR("%s: can't set max cache more than %lu MB\n",
 478                        ll_get_fsname(sb, NULL, 0),
 479                        totalram_pages >> (20 - PAGE_SHIFT));
 480                 RETURN(-ERANGE);
 481         }
 482         /* Allow enough cache so clients can make well-formed RPCs */
 483         pages_number = max_t(long, pages_number, PTLRPC_MAX_BRW_PAGES);
 484
 485         spin_lock(&sbi->ll_lock);
 486         diff = pages_number - cache->ccc_lru_max;
 487         spin_unlock(&sbi->ll_lock);
 488
 489         /* easy - add more LRU slots. */
 490         if (diff >= 0) {
 491                 atomic_long_add(diff, &cache->ccc_lru_left);
 492                 GOTO(out, rc = 0);
 493         }
 494
 495         env = cl_env_get(&refcheck);
 496         if (IS_ERR(env))
 497                 RETURN(rc);
 498
 499         diff = -diff;
 500         while (diff > 0) {
 501                 long tmp;
 502
 503                 /* reduce LRU budget from free slots. */
 504                 do {
 505                         long ov, nv;
 506
 507                         ov = atomic_long_read(&cache->ccc_lru_left);
 508                         if (ov == 0)
 509                                 break;
 510
 511                         nv = ov > diff ? ov - diff : 0;
 512                         rc = atomic_long_cmpxchg(&cache->ccc_lru_left, ov, nv);
 513                         if (likely(ov == rc)) {
 514                                 diff -= ov - nv;
 515                                 nrpages += ov - nv;
 516                                 break;
 517                         }
 518                 } while (1);
 519
 520                 if (diff <= 0)
 521                         break;
 522
 523                 if (sbi->ll_dt_exp == NULL) { /* being initialized */
 524                         rc = -ENODEV;
 525                         break;
 526                 }
 527
 528                 /* difficult - have to ask OSCs to drop LRU slots. */
 529                 tmp = diff << 1;
 530                 rc = obd_set_info_async(env, sbi->ll_dt_exp,
 531                                 sizeof(KEY_CACHE_LRU_SHRINK),
 532                                 KEY_CACHE_LRU_SHRINK,
 533                                 sizeof(tmp), &tmp, NULL);
 534                 if (rc < 0)
 535                         break;
 536         }
 537         cl_env_put(env, &refcheck);
 538
 539 out:
 540         if (rc >= 0) {
 541                 spin_lock(&sbi->ll_lock);
 542                 cache->ccc_lru_max = pages_number;
 543                 spin_unlock(&sbi->ll_lock);
 544                 rc = count;
 545         } else {
 546                 atomic_long_add(nrpages, &cache->ccc_lru_left);
 547         }
 548         return rc;
 549 }
 550 LPROC_SEQ_FOPS(ll_max_cached_mb);
 551
 552 static ssize_t checksums_show(struct kobject *kobj, struct attribute *attr,
 553                               char *buf)
 554 {
 555         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 556                                               ll_kset.kobj);
 557
 558         return sprintf(buf, "%u\n", (sbi->ll_flags & LL_SBI_CHECKSUM) ? 1 : 0);
 559 }
 560
 561 static ssize_t checksums_store(struct kobject *kobj, struct attribute *attr,
 562                                const char *buffer, size_t count)
 563 {
 564         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 565                                               ll_kset.kobj);
 566         bool val;
 567         int tmp;
 568         int rc;
 569
 570         if (!sbi->ll_dt_exp)
 571                 /* Not set up yet */
 572                 return -EAGAIN;
 573
 574         rc = kstrtobool(buffer, &val);
 575         if (rc)
 576                 return rc;
 577         if (val)
 578                 sbi->ll_flags |= LL_SBI_CHECKSUM;
 579         else
 580                 sbi->ll_flags &= ~LL_SBI_CHECKSUM;
 581         tmp = val;
 582
 583         rc = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 584                                 KEY_CHECKSUM, sizeof(tmp), &tmp, NULL);
 585         if (rc)
 586                 CWARN("Failed to set OSC checksum flags: %d\n", rc);
 587
 588         return count;
 589 }
 590 LUSTRE_RW_ATTR(checksums);
 591
 592 LUSTRE_ATTR(checksum_pages, 0644, checksums_show, checksums_store);
 593
 594 static ssize_t ll_rd_track_id(struct kobject *kobj, char *buf,
 595                               enum stats_track_type type)
 596 {
 597         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 598                                               ll_kset.kobj);
 599
 600         if (sbi->ll_stats_track_type == type)
 601                 return sprintf(buf, "%d\n", sbi->ll_stats_track_id);
 602         else if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
 603                 return sprintf(buf, "0 (all)\n");
 604
 605         return sprintf(buf, "untracked\n");
 606 }
 607
 608 static ssize_t ll_wr_track_id(struct kobject *kobj, const char *buffer,
 609                               size_t count, enum stats_track_type type)
 610 {
 611         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 612                                               ll_kset.kobj);
 613         unsigned long pid;
 614         int rc;
 615
 616         rc = kstrtoul(buffer, 10, &pid);
 617         if (rc)
 618                 return rc;
 619
 620         sbi->ll_stats_track_id = pid;
 621         if (pid == 0)
 622                 sbi->ll_stats_track_type = STATS_TRACK_ALL;
 623         else
 624                 sbi->ll_stats_track_type = type;
 625         lprocfs_clear_stats(sbi->ll_stats);
 626         return count;
 627 }
 628
 629 static ssize_t stats_track_pid_show(struct kobject *kobj,
 630                                     struct attribute *attr,
 631                                     char *buf)
 632 {
 633         return ll_rd_track_id(kobj, buf, STATS_TRACK_PID);
 634 }
 635
 636 static ssize_t stats_track_pid_store(struct kobject *kobj,
 637                                      struct attribute *attr,
 638                                      const char *buffer,
 639                                      size_t count)
 640 {
 641         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_PID);
 642 }
 643 LUSTRE_RW_ATTR(stats_track_pid);
 644
 645 static ssize_t stats_track_ppid_show(struct kobject *kobj,
 646                                      struct attribute *attr,
 647                                      char *buf)
 648 {
 649         return ll_rd_track_id(kobj, buf, STATS_TRACK_PPID);
 650 }
 651
 652 static ssize_t stats_track_ppid_store(struct kobject *kobj,
 653                                       struct attribute *attr,
 654                                       const char *buffer,
 655                                       size_t count)
 656 {
 657         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_PPID);
 658 }
 659 LUSTRE_RW_ATTR(stats_track_ppid);
 660
 661 static ssize_t stats_track_gid_show(struct kobject *kobj,
 662                                     struct attribute *attr,
 663                                     char *buf)
 664 {
 665         return ll_rd_track_id(kobj, buf, STATS_TRACK_GID);
 666 }
 667
 668 static ssize_t stats_track_gid_store(struct kobject *kobj,
 669                                      struct attribute *attr,
 670                                      const char *buffer,
 671                                      size_t count)
 672 {
 673         return ll_wr_track_id(kobj, buffer, count, STATS_TRACK_GID);
 674 }
 675 LUSTRE_RW_ATTR(stats_track_gid);
 676
 677 static ssize_t statahead_running_max_show(struct kobject *kobj,
 678                                           struct attribute *attr,
 679                                           char *buf)
 680 {
 681         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 682                                               ll_kset.kobj);
 683
 684         return snprintf(buf, 16, "%u\n", sbi->ll_sa_running_max);
 685 }
 686
 687 static ssize_t statahead_running_max_store(struct kobject *kobj,
 688                                            struct attribute *attr,
 689                                            const char *buffer,
 690                                            size_t count)
 691 {
 692         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 693                                               ll_kset.kobj);
 694         unsigned long val;
 695         int rc;
 696
 697         rc = kstrtoul(buffer, 0, &val);
 698         if (rc)
 699                 return rc;
 700
 701         if (val <= LL_SA_RUNNING_MAX) {
 702                 sbi->ll_sa_running_max = val;
 703                 return count;
 704         }
 705
 706         CERROR("Bad statahead_running_max value %lu. Valid values "
 707                "are in the range [0, %d]\n", val, LL_SA_RUNNING_MAX);
 708
 709         return -ERANGE;
 710 }
 711 LUSTRE_RW_ATTR(statahead_running_max);
 712
 713 static ssize_t statahead_max_show(struct kobject *kobj,
 714                                   struct attribute *attr,
 715                                   char *buf)
 716 {
 717         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 718                                               ll_kset.kobj);
 719
 720         return sprintf(buf, "%u\n", sbi->ll_sa_max);
 721 }
 722
 723 static ssize_t statahead_max_store(struct kobject *kobj,
 724                                    struct attribute *attr,
 725                                    const char *buffer,
 726                                    size_t count)
 727 {
 728         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 729                                               ll_kset.kobj);
 730         unsigned long val;
 731         int rc;
 732
 733         rc = kstrtoul(buffer, 0, &val);
 734         if (rc)
 735                 return rc;
 736
 737         if (val <= LL_SA_RPC_MAX)
 738                 sbi->ll_sa_max = val;
 739         else
 740                 CERROR("Bad statahead_max value %lu. Valid values are in the range [0, %d]\n",
 741                        val, LL_SA_RPC_MAX);
 742
 743         return count;
 744 }
 745 LUSTRE_RW_ATTR(statahead_max);
 746
 747 static ssize_t statahead_agl_show(struct kobject *kobj,
 748                                   struct attribute *attr,
 749                                   char *buf)
 750 {
 751         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 752                                               ll_kset.kobj);
 753
 754         return sprintf(buf, "%u\n", sbi->ll_flags & LL_SBI_AGL_ENABLED ? 1 : 0);
 755 }
 756
 757 static ssize_t statahead_agl_store(struct kobject *kobj,
 758                                    struct attribute *attr,
 759                                    const char *buffer,
 760                                    size_t count)
 761 {
 762         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 763                                               ll_kset.kobj);
 764         bool val;
 765         int rc;
 766
 767         rc = kstrtobool(buffer, &val);
 768         if (rc)
 769                 return rc;
 770
 771         if (val)
 772                 sbi->ll_flags |= LL_SBI_AGL_ENABLED;
 773         else
 774                 sbi->ll_flags &= ~LL_SBI_AGL_ENABLED;
 775
 776         return count;
 777 }
 778 LUSTRE_RW_ATTR(statahead_agl);
 779
 780 static int ll_statahead_stats_seq_show(struct seq_file *m, void *v)
 781 {
 782         struct super_block *sb = m->private;
 783         struct ll_sb_info *sbi = ll_s2sbi(sb);
 784
 785         seq_printf(m, "statahead total: %u\n"
 786                     "statahead wrong: %u\n"
 787                     "agl total: %u\n",
 788                     atomic_read(&sbi->ll_sa_total),
 789                     atomic_read(&sbi->ll_sa_wrong),
 790                     atomic_read(&sbi->ll_agl_total));
 791         return 0;
 792 }
 793 LPROC_SEQ_FOPS_RO(ll_statahead_stats);
 794
 795 static ssize_t lazystatfs_show(struct kobject *kobj,
 796                                struct attribute *attr,
 797                                char *buf)
 798 {
 799         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 800                                               ll_kset.kobj);
 801
 802         return sprintf(buf, "%u\n", (sbi->ll_flags & LL_SBI_LAZYSTATFS) ? 1 : 0);
 803 }
 804
 805 static ssize_t lazystatfs_store(struct kobject *kobj,
 806                                 struct attribute *attr,
 807                                 const char *buffer,
 808                                 size_t count)
 809 {
 810         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 811                                               ll_kset.kobj);
 812         bool val;
 813         int rc;
 814
 815         rc = kstrtobool(buffer, &val);
 816         if (rc)
 817                 return rc;
 818
 819         if (val)
 820                 sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 821         else
 822                 sbi->ll_flags &= ~LL_SBI_LAZYSTATFS;
 823
 824         return count;
 825 }
 826 LUSTRE_RW_ATTR(lazystatfs);
 827
 828 static ssize_t max_easize_show(struct kobject *kobj,
 829                                struct attribute *attr,
 830                                char *buf)
 831 {
 832         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 833                                               ll_kset.kobj);
 834         unsigned int ealen;
 835         int rc;
 836
 837         rc = ll_get_max_mdsize(sbi, &ealen);
 838         if (rc)
 839                 return rc;
 840
 841         return sprintf(buf, "%u\n", ealen);
 842 }
 843 LUSTRE_RO_ATTR(max_easize);
 844
 845 /**
 846  * Get default_easize.
 847  *
 848  * \see client_obd::cl_default_mds_easize
 849  *
 850  * \param[in] m         seq_file handle
 851  * \param[in] v         unused for single entry
 852  *
 853  * \retval 0            on success
 854  * \retval negative     negated errno on failure
 855  */
 856 static ssize_t default_easize_show(struct kobject *kobj,
 857                                    struct attribute *attr,
 858                                    char *buf)
 859 {
 860         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 861                                               ll_kset.kobj);
 862         unsigned int ealen;
 863         int rc;
 864
 865         rc = ll_get_default_mdsize(sbi, &ealen);
 866         if (rc)
 867                 return rc;
 868
 869         return sprintf(buf, "%u\n", ealen);
 870 }
 871
 872 /**
 873  * Set default_easize.
 874  *
 875  * Range checking on the passed value is handled by
 876  * ll_set_default_mdsize().
 877  *
 878  * \see client_obd::cl_default_mds_easize
 879  *
 880  * \param[in] file      proc file
 881  * \param[in] buffer    string passed from user space
 882  * \param[in] count     \a buffer length
 883  * \param[in] off       unused for single entry
 884  *
 885  * \retval positive     \a count on success
 886  * \retval negative     negated errno on failure
 887  */
 888 static ssize_t default_easize_store(struct kobject *kobj,
 889                                     struct attribute *attr,
 890                                     const char *buffer,
 891                                     size_t count)
 892 {
 893         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 894                                               ll_kset.kobj);
 895         unsigned int val;
 896         int rc;
 897
 898         if (count == 0)
 899                 return 0;
 900
 901         rc = kstrtouint(buffer, 10, &val);
 902         if (rc)
 903                 return rc;
 904
 905         rc = ll_set_default_mdsize(sbi, val);
 906         if (rc)
 907                 return rc;
 908
 909         return count;
 910 }
 911 LUSTRE_RW_ATTR(default_easize);
 912
 913 static int ll_sbi_flags_seq_show(struct seq_file *m, void *v)
 914 {
 915         const char *str[] = LL_SBI_FLAGS;
 916         struct super_block *sb = m->private;
 917         int flags = ll_s2sbi(sb)->ll_flags;
 918         int i = 0;
 919
 920         while (flags != 0) {
 921                 if (ARRAY_SIZE(str) <= i) {
 922                         CERROR("%s: Revise array LL_SBI_FLAGS to match sbi "
 923                                 "flags please.\n", ll_get_fsname(sb, NULL, 0));
 924                         return -EINVAL;
 925                 }
 926
 927                 if (flags & 0x1)
 928                         seq_printf(m, "%s ", str[i]);
 929                 flags >>= 1;
 930                 ++i;
 931         }
 932         seq_printf(m, "\b\n");
 933         return 0;
 934 }
 935 LPROC_SEQ_FOPS_RO(ll_sbi_flags);
 936
 937 static ssize_t xattr_cache_show(struct kobject *kobj,
 938                                 struct attribute *attr,
 939                                 char *buf)
 940 {
 941         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 942                                               ll_kset.kobj);
 943
 944         return sprintf(buf, "%u\n", sbi->ll_xattr_cache_enabled);
 945 }
 946
 947 static ssize_t xattr_cache_store(struct kobject *kobj,
 948                                  struct attribute *attr,
 949                                  const char *buffer,
 950                                  size_t count)
 951 {
 952         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
 953                                               ll_kset.kobj);
 954         bool val;
 955         int rc;
 956
 957         rc = kstrtobool(buffer, &val);
 958         if (rc)
 959                 return rc;
 960
 961         if (val && !(sbi->ll_flags & LL_SBI_XATTR_CACHE))
 962                 return -ENOTSUPP;
 963
 964         sbi->ll_xattr_cache_enabled = val;
 965         sbi->ll_xattr_cache_set = 1;
 966
 967         return count;
 968 }
 969 LUSTRE_RW_ATTR(xattr_cache);
 970
 971 static int ll_tiny_write_seq_show(struct seq_file *m, void *v)
 972 {
 973         struct super_block *sb = m->private;
 974         struct ll_sb_info *sbi = ll_s2sbi(sb);
 975
 976         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_TINY_WRITE));
 977         return 0;
 978 }
 979
 980 static ssize_t ll_tiny_write_seq_write(
 981         struct file *file, const char __user *buffer, size_t count, loff_t *off)
 982 {
 983         struct seq_file *m = file->private_data;
 984         struct super_block *sb = m->private;
 985         struct ll_sb_info *sbi = ll_s2sbi(sb);
 986         bool val;
 987         int rc;
 988
 989         rc = kstrtobool_from_user(buffer, count, &val);
 990         if (rc)
 991                 return rc;
 992
 993         spin_lock(&sbi->ll_lock);
 994         if (val)
 995                 sbi->ll_flags |= LL_SBI_TINY_WRITE;
 996         else
 997                 sbi->ll_flags &= ~LL_SBI_TINY_WRITE;
 998         spin_unlock(&sbi->ll_lock);
 999
1000         return count;
1001 }
1002 LPROC_SEQ_FOPS(ll_tiny_write);
1003
1004 static int ll_fast_read_seq_show(struct seq_file *m, void *v)
1005 {
1006         struct super_block *sb = m->private;
1007         struct ll_sb_info *sbi = ll_s2sbi(sb);
1008
1009         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_FAST_READ));
1010         return 0;
1011 }
1012
1013 static ssize_t
1014 ll_fast_read_seq_write(struct file *file, const char __user *buffer,
1015                        size_t count, loff_t *off)
1016 {
1017         struct seq_file *m = file->private_data;
1018         struct super_block *sb = m->private;
1019         struct ll_sb_info *sbi = ll_s2sbi(sb);
1020         bool val;
1021         int rc;
1022
1023         rc = kstrtobool_from_user(buffer, count, &val);
1024         if (rc)
1025                 return rc;
1026
1027         spin_lock(&sbi->ll_lock);
1028         if (val)
1029                 sbi->ll_flags |= LL_SBI_FAST_READ;
1030         else
1031                 sbi->ll_flags &= ~LL_SBI_FAST_READ;
1032         spin_unlock(&sbi->ll_lock);
1033
1034         return count;
1035 }
1036 LPROC_SEQ_FOPS(ll_fast_read);
1037
1038 static int ll_pio_seq_show(struct seq_file *m, void *v)
1039 {
1040         struct super_block *sb = m->private;
1041         struct ll_sb_info *sbi = ll_s2sbi(sb);
1042
1043         seq_printf(m, "%u\n", !!(sbi->ll_flags & LL_SBI_PIO));
1044         return 0;
1045 }
1046
1047 static ssize_t ll_pio_seq_write(struct file *file, const char __user *buffer,
1048                                 size_t count, loff_t *off)
1049 {
1050         struct seq_file *m = file->private_data;
1051         struct super_block *sb = m->private;
1052         struct ll_sb_info *sbi = ll_s2sbi(sb);
1053         bool val;
1054         int rc;
1055
1056         rc = kstrtobool_from_user(buffer, count, &val);
1057         if (rc)
1058                 return rc;
1059
1060         spin_lock(&sbi->ll_lock);
1061         if (val)
1062                 sbi->ll_flags |= LL_SBI_PIO;
1063         else
1064                 sbi->ll_flags &= ~LL_SBI_PIO;
1065         spin_unlock(&sbi->ll_lock);
1066
1067         return count;
1068 }
1069 LPROC_SEQ_FOPS(ll_pio);
1070
1071 static int ll_unstable_stats_seq_show(struct seq_file *m, void *v)
1072 {
1073         struct super_block      *sb    = m->private;
1074         struct ll_sb_info       *sbi   = ll_s2sbi(sb);
1075         struct cl_client_cache  *cache = sbi->ll_cache;
1076         long pages;
1077         int mb;
1078
1079         pages = atomic_long_read(&cache->ccc_unstable_nr);
1080         mb    = (pages * PAGE_SIZE) >> 20;
1081
1082         seq_printf(m, "unstable_check:     %8d\n"
1083                    "unstable_pages: %12ld\n"
1084                    "unstable_mb:        %8d\n",
1085                    cache->ccc_unstable_check, pages, mb);
1086         return 0;
1087 }
1088
1089 static ssize_t ll_unstable_stats_seq_write(struct file *file,
1090                                            const char __user *buffer,
1091                                            size_t count, loff_t *unused)
1092 {
1093         struct seq_file *seq = file->private_data;
1094         struct ll_sb_info *sbi = ll_s2sbi((struct super_block *)seq->private);
1095         char kernbuf[128];
1096         bool val;
1097         int rc;
1098
1099         if (count == 0)
1100                 return 0;
1101         if (count >= sizeof(kernbuf))
1102                 return -EINVAL;
1103
1104         if (copy_from_user(kernbuf, buffer, count))
1105                 return -EFAULT;
1106         kernbuf[count] = 0;
1107
1108         buffer += lprocfs_find_named_value(kernbuf, "unstable_check:", &count) -
1109                   kernbuf;
1110         rc = kstrtobool_from_user(buffer, count, &val);
1111         if (rc < 0)
1112                 return rc;
1113
1114         /* borrow lru lock to set the value */
1115         spin_lock(&sbi->ll_cache->ccc_lru_lock);
1116         sbi->ll_cache->ccc_unstable_check = val;
1117         spin_unlock(&sbi->ll_cache->ccc_lru_lock);
1118
1119         return count;
1120 }
1121 LPROC_SEQ_FOPS(ll_unstable_stats);
1122
1123 static int ll_root_squash_seq_show(struct seq_file *m, void *v)
1124 {
1125         struct super_block *sb = m->private;
1126         struct ll_sb_info *sbi = ll_s2sbi(sb);
1127         struct root_squash_info *squash = &sbi->ll_squash;
1128
1129         seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
1130         return 0;
1131 }
1132
1133 static ssize_t ll_root_squash_seq_write(struct file *file,
1134                                         const char __user *buffer,
1135                                         size_t count, loff_t *off)
1136 {
1137         struct seq_file *m = file->private_data;
1138         struct super_block *sb = m->private;
1139         struct ll_sb_info *sbi = ll_s2sbi(sb);
1140         struct root_squash_info *squash = &sbi->ll_squash;
1141
1142         return lprocfs_wr_root_squash(buffer, count, squash,
1143                                       ll_get_fsname(sb, NULL, 0));
1144 }
1145 LPROC_SEQ_FOPS(ll_root_squash);
1146
1147 static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
1148 {
1149         struct super_block *sb = m->private;
1150         struct ll_sb_info *sbi = ll_s2sbi(sb);
1151         struct root_squash_info *squash = &sbi->ll_squash;
1152         int len;
1153
1154         down_read(&squash->rsi_sem);
1155         if (!list_empty(&squash->rsi_nosquash_nids)) {
1156                 len = cfs_print_nidlist(m->buf + m->count, m->size - m->count,
1157                                         &squash->rsi_nosquash_nids);
1158                 m->count += len;
1159                 seq_putc(m, '\n');
1160         } else {
1161                 seq_puts(m, "NONE\n");
1162         }
1163         up_read(&squash->rsi_sem);
1164
1165         return 0;
1166 }
1167
1168 static ssize_t ll_nosquash_nids_seq_write(struct file *file,
1169                                           const char __user *buffer,
1170                                           size_t count, loff_t *off)
1171 {
1172         struct seq_file *m = file->private_data;
1173         struct super_block *sb = m->private;
1174         struct ll_sb_info *sbi = ll_s2sbi(sb);
1175         struct root_squash_info *squash = &sbi->ll_squash;
1176         int rc;
1177
1178         rc = lprocfs_wr_nosquash_nids(buffer, count, squash,
1179                                       ll_get_fsname(sb, NULL, 0));
1180         if (rc < 0)
1181                 return rc;
1182
1183         ll_compute_rootsquash_state(sbi);
1184
1185         return rc;
1186 }
1187 LPROC_SEQ_FOPS(ll_nosquash_nids);
1188
1189 struct lprocfs_vars lprocfs_llite_obd_vars[] = {
1190         { .name =       "site",
1191           .fops =       &ll_site_stats_fops                     },
1192         { .name =       "stat_blocksize",
1193           .fops =       &ll_stat_blksize_fops                   },
1194         { .name =       "max_read_ahead_mb",
1195           .fops =       &ll_max_readahead_mb_fops               },
1196         { .name =       "max_read_ahead_per_file_mb",
1197           .fops =       &ll_max_readahead_per_file_mb_fops      },
1198         { .name =       "max_read_ahead_whole_mb",
1199           .fops =       &ll_max_read_ahead_whole_mb_fops        },
1200         { .name =       "max_cached_mb",
1201           .fops =       &ll_max_cached_mb_fops                  },
1202         { .name =       "statahead_stats",
1203           .fops =       &ll_statahead_stats_fops                },
1204         { .name =       "sbi_flags",
1205           .fops =       &ll_sbi_flags_fops                      },
1206         { .name =       "unstable_stats",
1207           .fops =       &ll_unstable_stats_fops                 },
1208         { .name =       "root_squash",
1209           .fops =       &ll_root_squash_fops                    },
1210         { .name =       "nosquash_nids",
1211           .fops =       &ll_nosquash_nids_fops                  },
1212         { .name =       "fast_read",
1213           .fops =       &ll_fast_read_fops,                     },
1214         { .name =       "pio",
1215           .fops =       &ll_pio_fops,                           },
1216         { .name =       "tiny_write",
1217           .fops =       &ll_tiny_write_fops,                    },
1218         { NULL }
1219 };
1220
1221 #define MAX_STRING_SIZE 128
1222
1223 static struct attribute *llite_attrs[] = {
1224         &lustre_attr_blocksize.attr,
1225         &lustre_attr_kbytestotal.attr,
1226         &lustre_attr_kbytesfree.attr,
1227         &lustre_attr_kbytesavail.attr,
1228         &lustre_attr_filestotal.attr,
1229         &lustre_attr_filesfree.attr,
1230         &lustre_attr_client_type.attr,
1231         &lustre_attr_fstype.attr,
1232         &lustre_attr_uuid.attr,
1233         &lustre_attr_checksums.attr,
1234         &lustre_attr_checksum_pages.attr,
1235         &lustre_attr_stats_track_pid.attr,
1236         &lustre_attr_stats_track_ppid.attr,
1237         &lustre_attr_stats_track_gid.attr,
1238         &lustre_attr_statahead_running_max.attr,
1239         &lustre_attr_statahead_max.attr,
1240         &lustre_attr_statahead_agl.attr,
1241         &lustre_attr_lazystatfs.attr,
1242         &lustre_attr_max_easize.attr,
1243         &lustre_attr_default_easize.attr,
1244         &lustre_attr_xattr_cache.attr,
1245         NULL,
1246 };
1247
1248 static void llite_kobj_release(struct kobject *kobj)
1249 {
1250         struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
1251                                               ll_kset.kobj);
1252         complete(&sbi->ll_kobj_unregister);
1253 }
1254
1255 static struct kobj_type llite_ktype = {
1256         .default_attrs  = llite_attrs,
1257         .sysfs_ops      = &lustre_sysfs_ops,
1258         .release        = llite_kobj_release,
1259 };
1260
1261 static const struct llite_file_opcode {
1262         __u32       opcode;
1263         __u32       type;
1264         const char *opname;
1265 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
1266         /* file operation */
1267         { LPROC_LL_DIRTY_HITS,     LPROCFS_TYPE_REGS, "dirty_pages_hits" },
1268         { LPROC_LL_DIRTY_MISSES,   LPROCFS_TYPE_REGS, "dirty_pages_misses" },
1269         { LPROC_LL_READ_BYTES,     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1270                                    "read_bytes" },
1271         { LPROC_LL_WRITE_BYTES,    LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
1272                                    "write_bytes" },
1273         { LPROC_LL_BRW_READ,       LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1274                                    "brw_read" },
1275         { LPROC_LL_BRW_WRITE,      LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
1276                                    "brw_write" },
1277         { LPROC_LL_IOCTL,          LPROCFS_TYPE_REGS, "ioctl" },
1278         { LPROC_LL_OPEN,           LPROCFS_TYPE_REGS, "open" },
1279         { LPROC_LL_RELEASE,        LPROCFS_TYPE_REGS, "close" },
1280         { LPROC_LL_MAP,            LPROCFS_TYPE_REGS, "mmap" },
1281         { LPROC_LL_FAULT,          LPROCFS_TYPE_REGS, "page_fault" },
1282         { LPROC_LL_MKWRITE,        LPROCFS_TYPE_REGS, "page_mkwrite" },
1283         { LPROC_LL_LLSEEK,         LPROCFS_TYPE_REGS, "seek" },
1284         { LPROC_LL_FSYNC,          LPROCFS_TYPE_REGS, "fsync" },
1285         { LPROC_LL_READDIR,        LPROCFS_TYPE_REGS, "readdir" },
1286         /* inode operation */
1287         { LPROC_LL_SETATTR,        LPROCFS_TYPE_REGS, "setattr" },
1288         { LPROC_LL_TRUNC,          LPROCFS_TYPE_REGS, "truncate" },
1289         { LPROC_LL_FLOCK,          LPROCFS_TYPE_REGS, "flock" },
1290         { LPROC_LL_GETATTR,        LPROCFS_TYPE_REGS, "getattr" },
1291         /* dir inode operation */
1292         { LPROC_LL_CREATE,         LPROCFS_TYPE_REGS, "create" },
1293         { LPROC_LL_LINK,           LPROCFS_TYPE_REGS, "link" },
1294         { LPROC_LL_UNLINK,         LPROCFS_TYPE_REGS, "unlink" },
1295         { LPROC_LL_SYMLINK,        LPROCFS_TYPE_REGS, "symlink" },
1296         { LPROC_LL_MKDIR,          LPROCFS_TYPE_REGS, "mkdir" },
1297         { LPROC_LL_RMDIR,          LPROCFS_TYPE_REGS, "rmdir" },
1298         { LPROC_LL_MKNOD,          LPROCFS_TYPE_REGS, "mknod" },
1299         { LPROC_LL_RENAME,         LPROCFS_TYPE_REGS, "rename" },
1300         /* special inode operation */
1301         { LPROC_LL_STAFS,          LPROCFS_TYPE_REGS, "statfs" },
1302         { LPROC_LL_ALLOC_INODE,    LPROCFS_TYPE_REGS, "alloc_inode" },
1303         { LPROC_LL_SETXATTR,       LPROCFS_TYPE_REGS, "setxattr" },
1304         { LPROC_LL_GETXATTR,       LPROCFS_TYPE_REGS, "getxattr" },
1305         { LPROC_LL_GETXATTR_HITS,  LPROCFS_TYPE_REGS, "getxattr_hits" },
1306         { LPROC_LL_LISTXATTR,      LPROCFS_TYPE_REGS, "listxattr" },
1307         { LPROC_LL_REMOVEXATTR,    LPROCFS_TYPE_REGS, "removexattr" },
1308         { LPROC_LL_INODE_PERM,     LPROCFS_TYPE_REGS, "inode_permission" },
1309 };
1310
1311 void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count)
1312 {
1313         if (!sbi->ll_stats)
1314                 return;
1315         if (sbi->ll_stats_track_type == STATS_TRACK_ALL)
1316                 lprocfs_counter_add(sbi->ll_stats, op, count);
1317         else if (sbi->ll_stats_track_type == STATS_TRACK_PID &&
1318                  sbi->ll_stats_track_id == current->pid)
1319                 lprocfs_counter_add(sbi->ll_stats, op, count);
1320         else if (sbi->ll_stats_track_type == STATS_TRACK_PPID &&
1321                  sbi->ll_stats_track_id == current->parent->pid)
1322                 lprocfs_counter_add(sbi->ll_stats, op, count);
1323         else if (sbi->ll_stats_track_type == STATS_TRACK_GID &&
1324                  sbi->ll_stats_track_id ==
1325                         from_kgid(&init_user_ns, current_gid()))
1326                 lprocfs_counter_add(sbi->ll_stats, op, count);
1327 }
1328 EXPORT_SYMBOL(ll_stats_ops_tally);
1329
1330 static const char *ra_stat_string[] = {
1331         [RA_STAT_HIT] = "hits",
1332         [RA_STAT_MISS] = "misses",
1333         [RA_STAT_DISTANT_READPAGE] = "readpage not consecutive",
1334         [RA_STAT_MISS_IN_WINDOW] = "miss inside window",
1335         [RA_STAT_FAILED_GRAB_PAGE] = "failed grab_cache_page",
1336         [RA_STAT_FAILED_MATCH] = "failed lock match",
1337         [RA_STAT_DISCARDED] = "read but discarded",
1338         [RA_STAT_ZERO_LEN] = "zero length file",
1339         [RA_STAT_ZERO_WINDOW] = "zero size window",
1340         [RA_STAT_EOF] = "read-ahead to EOF",
1341         [RA_STAT_MAX_IN_FLIGHT] = "hit max r-a issue",
1342         [RA_STAT_WRONG_GRAB_PAGE] = "wrong page from grab_cache_page",
1343         [RA_STAT_FAILED_REACH_END] = "failed to reach end"
1344 };
1345
1346 LPROC_SEQ_FOPS_RO_TYPE(llite, name);
1347 LPROC_SEQ_FOPS_RO_TYPE(llite, uuid);
1348
1349 int ll_debugfs_register_super(struct super_block *sb, const char *name)
1350 {
1351         struct lustre_sb_info *lsi = s2lsi(sb);
1352         struct ll_sb_info *sbi = ll_s2sbi(sb);
1353         struct lprocfs_vars lvars[2];
1354         int err, id, rc;
1355
1356         ENTRY;
1357         memset(lvars, 0, sizeof(lvars));
1358         lvars[0].name = name;
1359
1360         LASSERT(sbi != NULL);
1361
1362         sbi->ll_proc_root = lprocfs_register(name, proc_lustre_fs_root,
1363                                              NULL, NULL);
1364         if (IS_ERR(sbi->ll_proc_root)) {
1365                 err = PTR_ERR(sbi->ll_proc_root);
1366                 sbi->ll_proc_root = NULL;
1367                 RETURN(err);
1368         }
1369
1370         rc = lprocfs_seq_create(sbi->ll_proc_root, "dump_page_cache", 0444,
1371                                 &vvp_dump_pgcache_file_ops, sbi);
1372         if (rc)
1373                 CWARN("Error adding the dump_page_cache file\n");
1374
1375         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats", 0644,
1376                                 &ll_rw_extents_stats_fops, sbi);
1377         if (rc)
1378                 CWARN("Error adding the extent_stats file\n");
1379
1380         rc = lprocfs_seq_create(sbi->ll_proc_root, "extents_stats_per_process",
1381                                 0644, &ll_rw_extents_stats_pp_fops, sbi);
1382         if (rc)
1383                 CWARN("Error adding the extents_stats_per_process file\n");
1384
1385         rc = lprocfs_seq_create(sbi->ll_proc_root, "offset_stats", 0644,
1386                                 &ll_rw_offset_stats_fops, sbi);
1387         if (rc)
1388                 CWARN("Error adding the offset_stats file\n");
1389
1390         /* File operations stats */
1391         sbi->ll_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES,
1392                                             LPROCFS_STATS_FLAG_NONE);
1393         if (sbi->ll_stats == NULL)
1394                 GOTO(out_proc, err = -ENOMEM);
1395
1396         /* do counter init */
1397         for (id = 0; id < LPROC_LL_FILE_OPCODES; id++) {
1398                 __u32 type = llite_opcode_table[id].type;
1399                 void *ptr = NULL;
1400                 if (type & LPROCFS_TYPE_REGS)
1401                         ptr = "regs";
1402                 else if (type & LPROCFS_TYPE_BYTES)
1403                         ptr = "bytes";
1404                 else if (type & LPROCFS_TYPE_PAGES)
1405                         ptr = "pages";
1406                 lprocfs_counter_init(sbi->ll_stats,
1407                                      llite_opcode_table[id].opcode,
1408                                      (type & LPROCFS_CNTR_AVGMINMAX),
1409                                      llite_opcode_table[id].opname, ptr);
1410         }
1411
1412         err = lprocfs_register_stats(sbi->ll_proc_root, "stats", sbi->ll_stats);
1413         if (err)
1414                 GOTO(out_stats, err);
1415
1416         sbi->ll_ra_stats = lprocfs_alloc_stats(ARRAY_SIZE(ra_stat_string),
1417                                                LPROCFS_STATS_FLAG_NONE);
1418         if (sbi->ll_ra_stats == NULL)
1419                 GOTO(out_stats, err = -ENOMEM);
1420
1421         for (id = 0; id < ARRAY_SIZE(ra_stat_string); id++)
1422                 lprocfs_counter_init(sbi->ll_ra_stats, id, 0,
1423                                      ra_stat_string[id], "pages");
1424         err = lprocfs_register_stats(sbi->ll_proc_root, "read_ahead_stats",
1425                                      sbi->ll_ra_stats);
1426         if (err)
1427                 GOTO(out_ra_stats, err);
1428
1429         err = lprocfs_add_vars(sbi->ll_proc_root, lprocfs_llite_obd_vars, sb);
1430         if (err)
1431                 GOTO(out_ra_stats, err);
1432
1433         /* Yes we also register sysfs mount kset here as well */
1434         sbi->ll_kset.kobj.parent = llite_kobj;
1435         sbi->ll_kset.kobj.ktype = &llite_ktype;
1436         init_completion(&sbi->ll_kobj_unregister);
1437         err = kobject_set_name(&sbi->ll_kset.kobj, "%s", name);
1438         if (err)
1439                 GOTO(out_ra_stats, err);
1440
1441         err = kset_register(&sbi->ll_kset);
1442         if (err)
1443                 GOTO(out_ra_stats, err);
1444
1445         lsi->lsi_kobj = kobject_get(&sbi->ll_kset.kobj);
1446
1447         RETURN(0);
1448 out_ra_stats:
1449         lprocfs_free_stats(&sbi->ll_ra_stats);
1450 out_stats:
1451         lprocfs_free_stats(&sbi->ll_stats);
1452 out_proc:
1453         lprocfs_remove(&sbi->ll_proc_root);
1454
1455         RETURN(err);
1456 }
1457
1458 int lprocfs_ll_register_obd(struct super_block *sb, const char *obdname)
1459 {
1460         struct lprocfs_vars lvars[2];
1461         struct ll_sb_info *sbi = ll_s2sbi(sb);
1462         struct obd_device *obd;
1463         struct proc_dir_entry *dir;
1464         char name[MAX_STRING_SIZE + 1];
1465         int err;
1466         ENTRY;
1467
1468         memset(lvars, 0, sizeof(lvars));
1469
1470         name[MAX_STRING_SIZE] = '\0';
1471         lvars[0].name = name;
1472
1473         LASSERT(sbi != NULL);
1474         LASSERT(obdname != NULL);
1475
1476         obd = class_name2obd(obdname);
1477
1478         LASSERT(obd != NULL);
1479         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
1480         LASSERT(obd->obd_type->typ_name != NULL);
1481
1482         dir = proc_mkdir(obd->obd_type->typ_name, sbi->ll_proc_root);
1483         if (dir == NULL)
1484                 GOTO(out, err = -ENOMEM);
1485
1486         snprintf(name, MAX_STRING_SIZE, "common_name");
1487         lvars[0].fops = &llite_name_fops;
1488         err = lprocfs_add_vars(dir, lvars, obd);
1489         if (err)
1490                 GOTO(out, err);
1491
1492         snprintf(name, MAX_STRING_SIZE, "uuid");
1493         lvars[0].fops = &llite_uuid_fops;
1494         err = lprocfs_add_vars(dir, lvars, obd);
1495         if (err)
1496                 GOTO(out, err);
1497
1498 out:
1499         if (err) {
1500                 lprocfs_remove(&sbi->ll_proc_root);
1501                 lprocfs_free_stats(&sbi->ll_ra_stats);
1502                 lprocfs_free_stats(&sbi->ll_stats);
1503         }
1504         RETURN(err);
1505 }
1506
1507 void ll_debugfs_unregister_super(struct super_block *sb)
1508 {
1509         struct lustre_sb_info *lsi = s2lsi(sb);
1510         struct ll_sb_info *sbi = ll_s2sbi(sb);
1511
1512         kobject_put(lsi->lsi_kobj);
1513
1514         kset_unregister(&sbi->ll_kset);
1515         wait_for_completion(&sbi->ll_kobj_unregister);
1516
1517         if (sbi->ll_proc_root) {
1518                 lprocfs_remove(&sbi->ll_proc_root);
1519                 lprocfs_free_stats(&sbi->ll_ra_stats);
1520                 lprocfs_free_stats(&sbi->ll_stats);
1521         }
1522 }
1523 #undef MAX_STRING_SIZE
1524
1525 #define pct(a,b) (b ? a * 100 / b : 0)
1526
1527 static void ll_display_extents_info(struct ll_rw_extents_info *io_extents,
1528                                    struct seq_file *seq, int which)
1529 {
1530         unsigned long read_tot = 0, write_tot = 0, read_cum, write_cum;
1531         unsigned long start, end, r, w;
1532         char *unitp = "KMGTPEZY";
1533         int i, units = 10;
1534         struct per_process_info *pp_info = &io_extents->pp_extents[which];
1535
1536         read_cum = 0;
1537         write_cum = 0;
1538         start = 0;
1539
1540         for(i = 0; i < LL_HIST_MAX; i++) {
1541                 read_tot += pp_info->pp_r_hist.oh_buckets[i];
1542                 write_tot += pp_info->pp_w_hist.oh_buckets[i];
1543         }
1544
1545         for(i = 0; i < LL_HIST_MAX; i++) {
1546                 r = pp_info->pp_r_hist.oh_buckets[i];
1547                 w = pp_info->pp_w_hist.oh_buckets[i];
1548                 read_cum += r;
1549                 write_cum += w;
1550                 end = 1 << (i + LL_HIST_START - units);
1551                 seq_printf(seq, "%4lu%c - %4lu%c%c: %14lu %4lu %4lu  | "
1552                            "%14lu %4lu %4lu\n", start, *unitp, end, *unitp,
1553                            (i == LL_HIST_MAX - 1) ? '+' : ' ',
1554                            r, pct(r, read_tot), pct(read_cum, read_tot),
1555                            w, pct(w, write_tot), pct(write_cum, write_tot));
1556                 start = end;
1557                 if (start == 1<<10) {
1558                         start = 1;
1559                         units += 10;
1560                         unitp++;
1561                 }
1562                 if (read_cum == read_tot && write_cum == write_tot)
1563                         break;
1564         }
1565 }
1566
1567 static int ll_rw_extents_stats_pp_seq_show(struct seq_file *seq, void *v)
1568 {
1569         struct timespec64 now;
1570         struct ll_sb_info *sbi = seq->private;
1571         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1572         int k;
1573
1574         ktime_get_real_ts64(&now);
1575
1576         if (!sbi->ll_rw_stats_on) {
1577                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1578                 return 0;
1579         }
1580         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1581                    (s64)now.tv_sec, now.tv_nsec);
1582         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1583         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1584                    "extents", "calls", "%", "cum%",
1585                    "calls", "%", "cum%");
1586         spin_lock(&sbi->ll_pp_extent_lock);
1587         for (k = 0; k < LL_PROCESS_HIST_MAX; k++) {
1588                 if (io_extents->pp_extents[k].pid != 0) {
1589                         seq_printf(seq, "\nPID: %d\n",
1590                                    io_extents->pp_extents[k].pid);
1591                         ll_display_extents_info(io_extents, seq, k);
1592                 }
1593         }
1594         spin_unlock(&sbi->ll_pp_extent_lock);
1595         return 0;
1596 }
1597
1598 static ssize_t ll_rw_extents_stats_pp_seq_write(struct file *file,
1599                                                 const char __user *buf,
1600                                                 size_t len,
1601                                                 loff_t *off)
1602 {
1603         struct seq_file *seq = file->private_data;
1604         struct ll_sb_info *sbi = seq->private;
1605         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1606         int i;
1607         __s64 value;
1608
1609         if (len == 0)
1610                 return -EINVAL;
1611
1612         value = ll_stats_pid_write(buf, len);
1613
1614         if (value == 0)
1615                 sbi->ll_rw_stats_on = 0;
1616         else
1617                 sbi->ll_rw_stats_on = 1;
1618
1619         spin_lock(&sbi->ll_pp_extent_lock);
1620         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1621                 io_extents->pp_extents[i].pid = 0;
1622                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1623                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1624         }
1625         spin_unlock(&sbi->ll_pp_extent_lock);
1626         return len;
1627 }
1628
1629 LPROC_SEQ_FOPS(ll_rw_extents_stats_pp);
1630
1631 static int ll_rw_extents_stats_seq_show(struct seq_file *seq, void *v)
1632 {
1633         struct timespec64 now;
1634         struct ll_sb_info *sbi = seq->private;
1635         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1636
1637         ktime_get_real_ts64(&now);
1638
1639         if (!sbi->ll_rw_stats_on) {
1640                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1641                 return 0;
1642         }
1643         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1644                    (s64)now.tv_sec, now.tv_nsec);
1645
1646         seq_printf(seq, "%15s %19s       | %20s\n", " ", "read", "write");
1647         seq_printf(seq, "%13s   %14s %4s %4s  | %14s %4s %4s\n",
1648                    "extents", "calls", "%", "cum%",
1649                    "calls", "%", "cum%");
1650         spin_lock(&sbi->ll_lock);
1651         ll_display_extents_info(io_extents, seq, LL_PROCESS_HIST_MAX);
1652         spin_unlock(&sbi->ll_lock);
1653
1654         return 0;
1655 }
1656
1657 static ssize_t ll_rw_extents_stats_seq_write(struct file *file,
1658                                              const char __user *buf,
1659                                              size_t len, loff_t *off)
1660 {
1661         struct seq_file *seq = file->private_data;
1662         struct ll_sb_info *sbi = seq->private;
1663         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1664         int i;
1665         __s64 value;
1666
1667         if (len == 0)
1668                 return -EINVAL;
1669
1670         value = ll_stats_pid_write(buf, len);
1671
1672         if (value == 0)
1673                 sbi->ll_rw_stats_on = 0;
1674         else
1675                 sbi->ll_rw_stats_on = 1;
1676
1677         spin_lock(&sbi->ll_pp_extent_lock);
1678         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
1679                 io_extents->pp_extents[i].pid = 0;
1680                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_r_hist);
1681                 lprocfs_oh_clear(&io_extents->pp_extents[i].pp_w_hist);
1682         }
1683         spin_unlock(&sbi->ll_pp_extent_lock);
1684
1685         return len;
1686 }
1687 LPROC_SEQ_FOPS(ll_rw_extents_stats);
1688
1689 void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
1690                        struct ll_file_data *file, loff_t pos,
1691                        size_t count, int rw)
1692 {
1693         int i, cur = -1;
1694         struct ll_rw_process_info *process;
1695         struct ll_rw_process_info *offset;
1696         int *off_count = &sbi->ll_rw_offset_entry_count;
1697         int *process_count = &sbi->ll_offset_process_count;
1698         struct ll_rw_extents_info *io_extents = &sbi->ll_rw_extents_info;
1699
1700         if(!sbi->ll_rw_stats_on)
1701                 return;
1702         process = sbi->ll_rw_process_info;
1703         offset = sbi->ll_rw_offset_info;
1704
1705         spin_lock(&sbi->ll_pp_extent_lock);
1706         /* Extent statistics */
1707         for(i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1708                 if(io_extents->pp_extents[i].pid == pid) {
1709                         cur = i;
1710                         break;
1711                 }
1712         }
1713
1714         if (cur == -1) {
1715                 /* new process */
1716                 sbi->ll_extent_process_count =
1717                         (sbi->ll_extent_process_count + 1) % LL_PROCESS_HIST_MAX;
1718                 cur = sbi->ll_extent_process_count;
1719                 io_extents->pp_extents[cur].pid = pid;
1720                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_r_hist);
1721                 lprocfs_oh_clear(&io_extents->pp_extents[cur].pp_w_hist);
1722         }
1723
1724         for(i = 0; (count >= (1 << LL_HIST_START << i)) &&
1725              (i < (LL_HIST_MAX - 1)); i++);
1726         if (rw == 0) {
1727                 io_extents->pp_extents[cur].pp_r_hist.oh_buckets[i]++;
1728                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_r_hist.oh_buckets[i]++;
1729         } else {
1730                 io_extents->pp_extents[cur].pp_w_hist.oh_buckets[i]++;
1731                 io_extents->pp_extents[LL_PROCESS_HIST_MAX].pp_w_hist.oh_buckets[i]++;
1732         }
1733         spin_unlock(&sbi->ll_pp_extent_lock);
1734
1735         spin_lock(&sbi->ll_process_lock);
1736         /* Offset statistics */
1737         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1738                 if (process[i].rw_pid == pid) {
1739                         if (process[i].rw_last_file != file) {
1740                                 process[i].rw_range_start = pos;
1741                                 process[i].rw_last_file_pos = pos + count;
1742                                 process[i].rw_smallest_extent = count;
1743                                 process[i].rw_largest_extent = count;
1744                                 process[i].rw_offset = 0;
1745                                 process[i].rw_last_file = file;
1746                                 spin_unlock(&sbi->ll_process_lock);
1747                                 return;
1748                         }
1749                         if (process[i].rw_last_file_pos != pos) {
1750                                 *off_count =
1751                                     (*off_count + 1) % LL_OFFSET_HIST_MAX;
1752                                 offset[*off_count].rw_op = process[i].rw_op;
1753                                 offset[*off_count].rw_pid = pid;
1754                                 offset[*off_count].rw_range_start =
1755                                         process[i].rw_range_start;
1756                                 offset[*off_count].rw_range_end =
1757                                         process[i].rw_last_file_pos;
1758                                 offset[*off_count].rw_smallest_extent =
1759                                         process[i].rw_smallest_extent;
1760                                 offset[*off_count].rw_largest_extent =
1761                                         process[i].rw_largest_extent;
1762                                 offset[*off_count].rw_offset =
1763                                         process[i].rw_offset;
1764                                 process[i].rw_op = rw;
1765                                 process[i].rw_range_start = pos;
1766                                 process[i].rw_smallest_extent = count;
1767                                 process[i].rw_largest_extent = count;
1768                                 process[i].rw_offset = pos -
1769                                         process[i].rw_last_file_pos;
1770                         }
1771                         if(process[i].rw_smallest_extent > count)
1772                                 process[i].rw_smallest_extent = count;
1773                         if(process[i].rw_largest_extent < count)
1774                                 process[i].rw_largest_extent = count;
1775                         process[i].rw_last_file_pos = pos + count;
1776                         spin_unlock(&sbi->ll_process_lock);
1777                         return;
1778                 }
1779         }
1780         *process_count = (*process_count + 1) % LL_PROCESS_HIST_MAX;
1781         process[*process_count].rw_pid = pid;
1782         process[*process_count].rw_op = rw;
1783         process[*process_count].rw_range_start = pos;
1784         process[*process_count].rw_last_file_pos = pos + count;
1785         process[*process_count].rw_smallest_extent = count;
1786         process[*process_count].rw_largest_extent = count;
1787         process[*process_count].rw_offset = 0;
1788         process[*process_count].rw_last_file = file;
1789         spin_unlock(&sbi->ll_process_lock);
1790 }
1791
1792 static int ll_rw_offset_stats_seq_show(struct seq_file *seq, void *v)
1793 {
1794         struct timespec64 now;
1795         struct ll_sb_info *sbi = seq->private;
1796         struct ll_rw_process_info *offset = sbi->ll_rw_offset_info;
1797         struct ll_rw_process_info *process = sbi->ll_rw_process_info;
1798         int i;
1799
1800         ktime_get_real_ts64(&now);
1801
1802         if (!sbi->ll_rw_stats_on) {
1803                 seq_puts(seq, "disabled\n write anything to this file to activate, then '0' or 'disable' to deactivate\n");
1804                 return 0;
1805         }
1806         spin_lock(&sbi->ll_process_lock);
1807
1808         seq_printf(seq, "snapshot_time:         %llu.%09lu (secs.nsecs)\n",
1809                    (s64)now.tv_sec, now.tv_nsec);
1810         seq_printf(seq, "%3s %10s %14s %14s %17s %17s %14s\n",
1811                    "R/W", "PID", "RANGE START", "RANGE END",
1812                    "SMALLEST EXTENT", "LARGEST EXTENT", "OFFSET");
1813
1814         /* We stored the discontiguous offsets here; print them first */
1815         for (i = 0; i < LL_OFFSET_HIST_MAX; i++) {
1816                 if (offset[i].rw_pid != 0)
1817                         seq_printf(seq,
1818                                   "%3c %10d %14llu %14llu %17lu %17lu %14llu\n",
1819                                    offset[i].rw_op == READ ? 'R' : 'W',
1820                                    offset[i].rw_pid,
1821                                    offset[i].rw_range_start,
1822                                    offset[i].rw_range_end,
1823                                    (unsigned long)offset[i].rw_smallest_extent,
1824                                    (unsigned long)offset[i].rw_largest_extent,
1825                                    offset[i].rw_offset);
1826         }
1827
1828         /* Then print the current offsets for each process */
1829         for (i = 0; i < LL_PROCESS_HIST_MAX; i++) {
1830                 if (process[i].rw_pid != 0)
1831                         seq_printf(seq,
1832                                   "%3c %10d %14llu %14llu %17lu %17lu %14llu\n",
1833                                    process[i].rw_op == READ ? 'R' : 'W',
1834                                    process[i].rw_pid,
1835                                    process[i].rw_range_start,
1836                                    process[i].rw_last_file_pos,
1837                                    (unsigned long)process[i].rw_smallest_extent,
1838                                    (unsigned long)process[i].rw_largest_extent,
1839                                    process[i].rw_offset);
1840         }
1841         spin_unlock(&sbi->ll_process_lock);
1842
1843         return 0;
1844 }
1845
1846 static ssize_t ll_rw_offset_stats_seq_write(struct file *file,
1847                                             const char __user *buf,
1848                                             size_t len, loff_t *off)
1849 {
1850         struct seq_file *seq = file->private_data;
1851         struct ll_sb_info *sbi = seq->private;
1852         struct ll_rw_process_info *process_info = sbi->ll_rw_process_info;
1853         struct ll_rw_process_info *offset_info = sbi->ll_rw_offset_info;
1854         __s64 value;
1855
1856         if (len == 0)
1857                 return -EINVAL;
1858
1859         value = ll_stats_pid_write(buf, len);
1860
1861         if (value == 0)
1862                 sbi->ll_rw_stats_on = 0;
1863         else
1864                 sbi->ll_rw_stats_on = 1;
1865
1866         spin_lock(&sbi->ll_process_lock);
1867         sbi->ll_offset_process_count = 0;
1868         sbi->ll_rw_offset_entry_count = 0;
1869         memset(process_info, 0, sizeof(struct ll_rw_process_info) *
1870                LL_PROCESS_HIST_MAX);
1871         memset(offset_info, 0, sizeof(struct ll_rw_process_info) *
1872                LL_OFFSET_HIST_MAX);
1873         spin_unlock(&sbi->ll_process_lock);
1874
1875         return len;
1876 }
1877
1878 /**
1879  * ll_stats_pid_write() - Determine if stats collection should be enabled
1880  * @buf: Buffer containing the data written
1881  * @len: Number of bytes in the buffer
1882  *
1883  * Several proc files begin collecting stats when a value is written, and stop
1884  * collecting when either '0' or 'disable' is written. This function checks the
1885  * written value to see if collection should be enabled or disabled.
1886  *
1887  * Return: If '0' or 'disable' is provided, 0 is returned. If the text
1888  * equivalent of a number is written, that number is returned. Otherwise,
1889  * 1 is returned. Non-zero return values indicate collection should be enabled.
1890  */
1891 static __s64 ll_stats_pid_write(const char __user *buf, size_t len)
1892 {
1893         unsigned long long value = 1;
1894         int rc;
1895         char kernbuf[16];
1896
1897         rc = kstrtoull_from_user(buf, len, 0, &value);
1898         if (rc < 0 && len < sizeof(kernbuf)) {
1899
1900                 if (copy_from_user(kernbuf, buf, len))
1901                         return -EFAULT;
1902                 kernbuf[len] = 0;
1903
1904                 if (kernbuf[len - 1] == '\n')
1905                         kernbuf[len - 1] = 0;
1906
1907                 if (strncasecmp(kernbuf, "disable", 7) == 0)
1908                         value = 0;
1909         }
1910
1911         return value;
1912 }
1913
1914 LPROC_SEQ_FOPS(ll_rw_offset_stats);
1915 #endif /* CONFIG_PROC_FS */