module/spl/spl-kstat.c

   1 /*
   2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3  *  Copyright (C) 2007 The Regents of the University of California.
   4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   6  *  UCRL-CODE-235197
   7  *
   8  *  This file is part of the SPL, Solaris Porting Layer.
   9  *  For details, see <http://zfsonlinux.org/>.
  10  *
  11  *  The SPL is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License as published by the
  13  *  Free Software Foundation; either version 2 of the License, or (at your
  14  *  option) any later version.
  15  *
  16  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  17  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  *  for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  23  *
  24  *  Solaris Porting Layer (SPL) Kstat Implementation.
  25  */
  26
  27 #include <linux/seq_file.h>
  28 #include <sys/kstat.h>
  29 #include <sys/vmem.h>
  30 #include <sys/cmn_err.h>
  31
  32 #ifndef HAVE_PDE_DATA
  33 #define PDE_DATA(x) (PDE(x)->data)
  34 #endif
  35
  36 static kmutex_t kstat_module_lock;
  37 static struct list_head kstat_module_list;
  38 static kid_t kstat_id;
  39
  40 static int
  41 kstat_resize_raw(kstat_t *ksp)
  42 {
  43         if (ksp->ks_raw_bufsize == KSTAT_RAW_MAX)
  44                 return (ENOMEM);
  45
  46         vmem_free(ksp->ks_raw_buf, ksp->ks_raw_bufsize);
  47         ksp->ks_raw_bufsize = MIN(ksp->ks_raw_bufsize * 2, KSTAT_RAW_MAX);
  48         ksp->ks_raw_buf = vmem_alloc(ksp->ks_raw_bufsize, KM_SLEEP);
  49
  50         return (0);
  51 }
  52
  53 void
  54 kstat_waitq_enter(kstat_io_t *kiop)
  55 {
  56         hrtime_t new, delta;
  57         ulong_t wcnt;
  58
  59         new = gethrtime();
  60         delta = new - kiop->wlastupdate;
  61         kiop->wlastupdate = new;
  62         wcnt = kiop->wcnt++;
  63         if (wcnt != 0) {
  64                 kiop->wlentime += delta * wcnt;
  65                 kiop->wtime += delta;
  66         }
  67 }
  68 EXPORT_SYMBOL(kstat_waitq_enter);
  69
  70 void
  71 kstat_waitq_exit(kstat_io_t *kiop)
  72 {
  73         hrtime_t new, delta;
  74         ulong_t wcnt;
  75
  76         new = gethrtime();
  77         delta = new - kiop->wlastupdate;
  78         kiop->wlastupdate = new;
  79         wcnt = kiop->wcnt--;
  80         ASSERT((int)wcnt > 0);
  81         kiop->wlentime += delta * wcnt;
  82         kiop->wtime += delta;
  83 }
  84 EXPORT_SYMBOL(kstat_waitq_exit);
  85
  86 void
  87 kstat_runq_enter(kstat_io_t *kiop)
  88 {
  89         hrtime_t new, delta;
  90         ulong_t rcnt;
  91
  92         new = gethrtime();
  93         delta = new - kiop->rlastupdate;
  94         kiop->rlastupdate = new;
  95         rcnt = kiop->rcnt++;
  96         if (rcnt != 0) {
  97                 kiop->rlentime += delta * rcnt;
  98                 kiop->rtime += delta;
  99         }
 100 }
 101 EXPORT_SYMBOL(kstat_runq_enter);
 102
 103 void
 104 kstat_runq_exit(kstat_io_t *kiop)
 105 {
 106         hrtime_t new, delta;
 107         ulong_t rcnt;
 108
 109         new = gethrtime();
 110         delta = new - kiop->rlastupdate;
 111         kiop->rlastupdate = new;
 112         rcnt = kiop->rcnt--;
 113         ASSERT((int)rcnt > 0);
 114         kiop->rlentime += delta * rcnt;
 115         kiop->rtime += delta;
 116 }
 117 EXPORT_SYMBOL(kstat_runq_exit);
 118
 119 static int
 120 kstat_seq_show_headers(struct seq_file *f)
 121 {
 122         kstat_t *ksp = (kstat_t *)f->private;
 123         int rc = 0;
 124
 125         ASSERT(ksp->ks_magic == KS_MAGIC);
 126
 127         seq_printf(f, "%d %d 0x%02x %d %d %lld %lld\n",
 128             ksp->ks_kid, ksp->ks_type, ksp->ks_flags,
 129             ksp->ks_ndata, (int)ksp->ks_data_size,
 130             ksp->ks_crtime, ksp->ks_snaptime);
 131
 132         switch (ksp->ks_type) {
 133                 case KSTAT_TYPE_RAW:
 134 restart:
 135                         if (ksp->ks_raw_ops.headers) {
 136                                 rc = ksp->ks_raw_ops.headers(
 137                                     ksp->ks_raw_buf, ksp->ks_raw_bufsize);
 138                                 if (rc == ENOMEM && !kstat_resize_raw(ksp))
 139                                         goto restart;
 140                                 if (!rc)
 141                                         seq_puts(f, ksp->ks_raw_buf);
 142                         } else {
 143                                 seq_printf(f, "raw data\n");
 144                         }
 145                         break;
 146                 case KSTAT_TYPE_NAMED:
 147                         seq_printf(f, "%-31s %-4s %s\n",
 148                             "name", "type", "data");
 149                         break;
 150                 case KSTAT_TYPE_INTR:
 151                         seq_printf(f, "%-8s %-8s %-8s %-8s %-8s\n",
 152                             "hard", "soft", "watchdog",
 153                             "spurious", "multsvc");
 154                         break;
 155                 case KSTAT_TYPE_IO:
 156                         seq_printf(f,
 157                             "%-8s %-8s %-8s %-8s %-8s %-8s "
 158                             "%-8s %-8s %-8s %-8s %-8s %-8s\n",
 159                             "nread", "nwritten", "reads", "writes",
 160                             "wtime", "wlentime", "wupdate",
 161                             "rtime", "rlentime", "rupdate",
 162                             "wcnt", "rcnt");
 163                         break;
 164                 case KSTAT_TYPE_TIMER:
 165                         seq_printf(f,
 166                             "%-31s %-8s "
 167                             "%-8s %-8s %-8s %-8s %-8s\n",
 168                             "name", "events", "elapsed",
 169                             "min", "max", "start", "stop");
 170                         break;
 171                 default:
 172                         PANIC("Undefined kstat type %d\n", ksp->ks_type);
 173         }
 174
 175         return (-rc);
 176 }
 177
 178 static int
 179 kstat_seq_show_raw(struct seq_file *f, unsigned char *p, int l)
 180 {
 181         int i, j;
 182
 183         for (i = 0; ; i++) {
 184                 seq_printf(f, "%03x:", i);
 185
 186                 for (j = 0; j < 16; j++) {
 187                         if (i * 16 + j >= l) {
 188                                 seq_printf(f, "\n");
 189                                 goto out;
 190                         }
 191
 192                         seq_printf(f, " %02x", (unsigned char)p[i * 16 + j]);
 193                 }
 194                 seq_printf(f, "\n");
 195         }
 196 out:
 197         return (0);
 198 }
 199
 200 static int
 201 kstat_seq_show_named(struct seq_file *f, kstat_named_t *knp)
 202 {
 203         seq_printf(f, "%-31s %-4d ", knp->name, knp->data_type);
 204
 205         switch (knp->data_type) {
 206                 case KSTAT_DATA_CHAR:
 207                         knp->value.c[15] = '\0'; /* NULL terminate */
 208                         seq_printf(f, "%-16s", knp->value.c);
 209                         break;
 210                 /*
 211                  * NOTE - We need to be more careful able what tokens are
 212                  * used for each arch, for now this is correct for x86_64.
 213                  */
 214                 case KSTAT_DATA_INT32:
 215                         seq_printf(f, "%d", knp->value.i32);
 216                         break;
 217                 case KSTAT_DATA_UINT32:
 218                         seq_printf(f, "%u", knp->value.ui32);
 219                         break;
 220                 case KSTAT_DATA_INT64:
 221                         seq_printf(f, "%lld", (signed long long)knp->value.i64);
 222                         break;
 223                 case KSTAT_DATA_UINT64:
 224                         seq_printf(f, "%llu",
 225                             (unsigned long long)knp->value.ui64);
 226                         break;
 227                 case KSTAT_DATA_LONG:
 228                         seq_printf(f, "%ld", knp->value.l);
 229                         break;
 230                 case KSTAT_DATA_ULONG:
 231                         seq_printf(f, "%lu", knp->value.ul);
 232                         break;
 233                 case KSTAT_DATA_STRING:
 234                         KSTAT_NAMED_STR_PTR(knp)
 235                                 [KSTAT_NAMED_STR_BUFLEN(knp)-1] = '\0';
 236                         seq_printf(f, "%s", KSTAT_NAMED_STR_PTR(knp));
 237                         break;
 238                 default:
 239                         PANIC("Undefined kstat data type %d\n", knp->data_type);
 240         }
 241
 242         seq_printf(f, "\n");
 243
 244         return (0);
 245 }
 246
 247 static int
 248 kstat_seq_show_intr(struct seq_file *f, kstat_intr_t *kip)
 249 {
 250         seq_printf(f, "%-8u %-8u %-8u %-8u %-8u\n",
 251             kip->intrs[KSTAT_INTR_HARD],
 252             kip->intrs[KSTAT_INTR_SOFT],
 253             kip->intrs[KSTAT_INTR_WATCHDOG],
 254             kip->intrs[KSTAT_INTR_SPURIOUS],
 255             kip->intrs[KSTAT_INTR_MULTSVC]);
 256
 257         return (0);
 258 }
 259
 260 static int
 261 kstat_seq_show_io(struct seq_file *f, kstat_io_t *kip)
 262 {
 263         seq_printf(f,
 264             "%-8llu %-8llu %-8u %-8u %-8lld %-8lld "
 265             "%-8lld %-8lld %-8lld %-8lld %-8u %-8u\n",
 266             kip->nread, kip->nwritten,
 267             kip->reads, kip->writes,
 268             kip->wtime, kip->wlentime, kip->wlastupdate,
 269             kip->rtime, kip->rlentime, kip->rlastupdate,
 270             kip->wcnt,  kip->rcnt);
 271
 272         return (0);
 273 }
 274
 275 static int
 276 kstat_seq_show_timer(struct seq_file *f, kstat_timer_t *ktp)
 277 {
 278         seq_printf(f,
 279             "%-31s %-8llu %-8lld %-8lld %-8lld %-8lld %-8lld\n",
 280             ktp->name, ktp->num_events, ktp->elapsed_time,
 281             ktp->min_time, ktp->max_time,
 282             ktp->start_time, ktp->stop_time);
 283
 284         return (0);
 285 }
 286
 287 static int
 288 kstat_seq_show(struct seq_file *f, void *p)
 289 {
 290         kstat_t *ksp = (kstat_t *)f->private;
 291         int rc = 0;
 292
 293         ASSERT(ksp->ks_magic == KS_MAGIC);
 294
 295         switch (ksp->ks_type) {
 296                 case KSTAT_TYPE_RAW:
 297 restart:
 298                         if (ksp->ks_raw_ops.data) {
 299                                 rc = ksp->ks_raw_ops.data(
 300                                     ksp->ks_raw_buf, ksp->ks_raw_bufsize, p);
 301                                 if (rc == ENOMEM && !kstat_resize_raw(ksp))
 302                                         goto restart;
 303                                 if (!rc)
 304                                         seq_puts(f, ksp->ks_raw_buf);
 305                         } else {
 306                                 ASSERT(ksp->ks_ndata == 1);
 307                                 rc = kstat_seq_show_raw(f, ksp->ks_data,
 308                                                         ksp->ks_data_size);
 309                         }
 310                         break;
 311                 case KSTAT_TYPE_NAMED:
 312                         rc = kstat_seq_show_named(f, (kstat_named_t *)p);
 313                         break;
 314                 case KSTAT_TYPE_INTR:
 315                         rc = kstat_seq_show_intr(f, (kstat_intr_t *)p);
 316                         break;
 317                 case KSTAT_TYPE_IO:
 318                         rc = kstat_seq_show_io(f, (kstat_io_t *)p);
 319                         break;
 320                 case KSTAT_TYPE_TIMER:
 321                         rc = kstat_seq_show_timer(f, (kstat_timer_t *)p);
 322                         break;
 323                 default:
 324                         PANIC("Undefined kstat type %d\n", ksp->ks_type);
 325         }
 326
 327         return (-rc);
 328 }
 329
 330 int
 331 kstat_default_update(kstat_t *ksp, int rw)
 332 {
 333         ASSERT(ksp != NULL);
 334
 335         if (rw == KSTAT_WRITE)
 336                 return (EACCES);
 337
 338         return (0);
 339 }
 340
 341 static void *
 342 kstat_seq_data_addr(kstat_t *ksp, loff_t n)
 343 {
 344         void *rc = NULL;
 345
 346         switch (ksp->ks_type) {
 347                 case KSTAT_TYPE_RAW:
 348                         if (ksp->ks_raw_ops.addr)
 349                                 rc = ksp->ks_raw_ops.addr(ksp, n);
 350                         else
 351                                 rc = ksp->ks_data;
 352                         break;
 353                 case KSTAT_TYPE_NAMED:
 354                         rc = ksp->ks_data + n * sizeof (kstat_named_t);
 355                         break;
 356                 case KSTAT_TYPE_INTR:
 357                         rc = ksp->ks_data + n * sizeof (kstat_intr_t);
 358                         break;
 359                 case KSTAT_TYPE_IO:
 360                         rc = ksp->ks_data + n * sizeof (kstat_io_t);
 361                         break;
 362                 case KSTAT_TYPE_TIMER:
 363                         rc = ksp->ks_data + n * sizeof (kstat_timer_t);
 364                         break;
 365                 default:
 366                         PANIC("Undefined kstat type %d\n", ksp->ks_type);
 367         }
 368
 369         return (rc);
 370 }
 371
 372 static void *
 373 kstat_seq_start(struct seq_file *f, loff_t *pos)
 374 {
 375         loff_t n = *pos;
 376         kstat_t *ksp = (kstat_t *)f->private;
 377         ASSERT(ksp->ks_magic == KS_MAGIC);
 378
 379         mutex_enter(ksp->ks_lock);
 380
 381         if (ksp->ks_type == KSTAT_TYPE_RAW) {
 382                 ksp->ks_raw_bufsize = PAGE_SIZE;
 383                 ksp->ks_raw_buf = vmem_alloc(ksp->ks_raw_bufsize, KM_SLEEP);
 384         }
 385
 386         /* Dynamically update kstat, on error existing kstats are used */
 387         (void) ksp->ks_update(ksp, KSTAT_READ);
 388
 389         ksp->ks_snaptime = gethrtime();
 390
 391         if (!n && kstat_seq_show_headers(f))
 392                 return (NULL);
 393
 394         if (n >= ksp->ks_ndata)
 395                 return (NULL);
 396
 397         return (kstat_seq_data_addr(ksp, n));
 398 }
 399
 400 static void *
 401 kstat_seq_next(struct seq_file *f, void *p, loff_t *pos)
 402 {
 403         kstat_t *ksp = (kstat_t *)f->private;
 404         ASSERT(ksp->ks_magic == KS_MAGIC);
 405
 406         ++*pos;
 407         if (*pos >= ksp->ks_ndata)
 408                 return (NULL);
 409
 410         return (kstat_seq_data_addr(ksp, *pos));
 411 }
 412
 413 static void
 414 kstat_seq_stop(struct seq_file *f, void *v)
 415 {
 416         kstat_t *ksp = (kstat_t *)f->private;
 417         ASSERT(ksp->ks_magic == KS_MAGIC);
 418
 419         if (ksp->ks_type == KSTAT_TYPE_RAW)
 420                 vmem_free(ksp->ks_raw_buf, ksp->ks_raw_bufsize);
 421
 422         mutex_exit(ksp->ks_lock);
 423 }
 424
 425 static struct seq_operations kstat_seq_ops = {
 426         .show  = kstat_seq_show,
 427         .start = kstat_seq_start,
 428         .next  = kstat_seq_next,
 429         .stop  = kstat_seq_stop,
 430 };
 431
 432 static kstat_module_t *
 433 kstat_find_module(char *name)
 434 {
 435         kstat_module_t *module;
 436
 437         list_for_each_entry(module, &kstat_module_list, ksm_module_list)
 438                 if (strncmp(name, module->ksm_name, KSTAT_STRLEN) == 0)
 439                         return (module);
 440
 441         return (NULL);
 442 }
 443
 444 static kstat_module_t *
 445 kstat_create_module(char *name)
 446 {
 447         kstat_module_t *module;
 448         struct proc_dir_entry *pde;
 449
 450         pde = proc_mkdir(name, proc_spl_kstat);
 451         if (pde == NULL)
 452                 return (NULL);
 453
 454         module = kmem_alloc(sizeof (kstat_module_t), KM_SLEEP);
 455         module->ksm_proc = pde;
 456         strlcpy(module->ksm_name, name, KSTAT_STRLEN+1);
 457         INIT_LIST_HEAD(&module->ksm_kstat_list);
 458         list_add_tail(&module->ksm_module_list, &kstat_module_list);
 459
 460         return (module);
 461
 462 }
 463
 464 static void
 465 kstat_delete_module(kstat_module_t *module)
 466 {
 467         ASSERT(list_empty(&module->ksm_kstat_list));
 468         remove_proc_entry(module->ksm_name, proc_spl_kstat);
 469         list_del(&module->ksm_module_list);
 470         kmem_free(module, sizeof (kstat_module_t));
 471 }
 472
 473 static int
 474 proc_kstat_open(struct inode *inode, struct file *filp)
 475 {
 476         struct seq_file *f;
 477         int rc;
 478
 479         rc = seq_open(filp, &kstat_seq_ops);
 480         if (rc)
 481                 return (rc);
 482
 483         f = filp->private_data;
 484         f->private = PDE_DATA(inode);
 485
 486         return (rc);
 487 }
 488
 489 static ssize_t
 490 proc_kstat_write(struct file *filp, const char __user *buf, size_t len,
 491     loff_t *ppos)
 492 {
 493         struct seq_file *f = filp->private_data;
 494         kstat_t *ksp = f->private;
 495         int rc;
 496
 497         ASSERT(ksp->ks_magic == KS_MAGIC);
 498
 499         mutex_enter(ksp->ks_lock);
 500         rc = ksp->ks_update(ksp, KSTAT_WRITE);
 501         mutex_exit(ksp->ks_lock);
 502
 503         if (rc)
 504                 return (-rc);
 505
 506         *ppos += len;
 507         return (len);
 508 }
 509
 510 static struct file_operations proc_kstat_operations = {
 511         .open           = proc_kstat_open,
 512         .write          = proc_kstat_write,
 513         .read           = seq_read,
 514         .llseek         = seq_lseek,
 515         .release        = seq_release,
 516 };
 517
 518 void
 519 __kstat_set_raw_ops(kstat_t *ksp,
 520                     int (*headers)(char *buf, size_t size),
 521                     int (*data)(char *buf, size_t size, void *data),
 522                     void *(*addr)(kstat_t *ksp, loff_t index))
 523 {
 524         ksp->ks_raw_ops.headers = headers;
 525         ksp->ks_raw_ops.data    = data;
 526         ksp->ks_raw_ops.addr    = addr;
 527 }
 528 EXPORT_SYMBOL(__kstat_set_raw_ops);
 529
 530 kstat_t *
 531 __kstat_create(const char *ks_module, int ks_instance, const char *ks_name,
 532     const char *ks_class, uchar_t ks_type, uint_t ks_ndata,
 533     uchar_t ks_flags)
 534 {
 535         kstat_t *ksp;
 536
 537         ASSERT(ks_module);
 538         ASSERT(ks_instance == 0);
 539         ASSERT(ks_name);
 540         ASSERT(!(ks_flags & KSTAT_FLAG_UNSUPPORTED));
 541
 542         if ((ks_type == KSTAT_TYPE_INTR) || (ks_type == KSTAT_TYPE_IO))
 543                 ASSERT(ks_ndata == 1);
 544
 545         ksp = kmem_zalloc(sizeof (*ksp), KM_SLEEP);
 546         if (ksp == NULL)
 547                 return (ksp);
 548
 549         mutex_enter(&kstat_module_lock);
 550         ksp->ks_kid = kstat_id;
 551         kstat_id++;
 552         mutex_exit(&kstat_module_lock);
 553
 554         ksp->ks_magic = KS_MAGIC;
 555         mutex_init(&ksp->ks_private_lock, NULL, MUTEX_DEFAULT, NULL);
 556         ksp->ks_lock = &ksp->ks_private_lock;
 557         INIT_LIST_HEAD(&ksp->ks_list);
 558
 559         ksp->ks_crtime = gethrtime();
 560         ksp->ks_snaptime = ksp->ks_crtime;
 561         strncpy(ksp->ks_module, ks_module, KSTAT_STRLEN);
 562         ksp->ks_instance = ks_instance;
 563         strncpy(ksp->ks_name, ks_name, KSTAT_STRLEN);
 564         strncpy(ksp->ks_class, ks_class, KSTAT_STRLEN);
 565         ksp->ks_type = ks_type;
 566         ksp->ks_flags = ks_flags;
 567         ksp->ks_update = kstat_default_update;
 568         ksp->ks_private = NULL;
 569         ksp->ks_raw_ops.headers = NULL;
 570         ksp->ks_raw_ops.data = NULL;
 571         ksp->ks_raw_ops.addr = NULL;
 572         ksp->ks_raw_buf = NULL;
 573         ksp->ks_raw_bufsize = 0;
 574
 575         switch (ksp->ks_type) {
 576                 case KSTAT_TYPE_RAW:
 577                         ksp->ks_ndata = 1;
 578                         ksp->ks_data_size = ks_ndata;
 579                         break;
 580                 case KSTAT_TYPE_NAMED:
 581                         ksp->ks_ndata = ks_ndata;
 582                         ksp->ks_data_size = ks_ndata * sizeof (kstat_named_t);
 583                         break;
 584                 case KSTAT_TYPE_INTR:
 585                         ksp->ks_ndata = ks_ndata;
 586                         ksp->ks_data_size = ks_ndata * sizeof (kstat_intr_t);
 587                         break;
 588                 case KSTAT_TYPE_IO:
 589                         ksp->ks_ndata = ks_ndata;
 590                         ksp->ks_data_size = ks_ndata * sizeof (kstat_io_t);
 591                         break;
 592                 case KSTAT_TYPE_TIMER:
 593                         ksp->ks_ndata = ks_ndata;
 594                         ksp->ks_data_size = ks_ndata * sizeof (kstat_timer_t);
 595                         break;
 596                 default:
 597                         PANIC("Undefined kstat type %d\n", ksp->ks_type);
 598         }
 599
 600         if (ksp->ks_flags & KSTAT_FLAG_VIRTUAL) {
 601                 ksp->ks_data = NULL;
 602         } else {
 603                 ksp->ks_data = kmem_zalloc(ksp->ks_data_size, KM_SLEEP);
 604                 if (ksp->ks_data == NULL) {
 605                         kmem_free(ksp, sizeof (*ksp));
 606                         ksp = NULL;
 607                 }
 608         }
 609
 610         return (ksp);
 611 }
 612 EXPORT_SYMBOL(__kstat_create);
 613
 614 static int
 615 kstat_detect_collision(kstat_t *ksp)
 616 {
 617         kstat_module_t *module;
 618         kstat_t *tmp;
 619         char *parent;
 620         char *cp;
 621
 622         parent = kmem_asprintf("%s", ksp->ks_module);
 623
 624         if ((cp = strrchr(parent, '/')) == NULL) {
 625                 strfree(parent);
 626                 return (0);
 627         }
 628
 629         cp[0] = '\0';
 630         if ((module = kstat_find_module(parent)) != NULL) {
 631                 list_for_each_entry(tmp, &module->ksm_kstat_list, ks_list)
 632                         if (strncmp(tmp->ks_name, cp+1, KSTAT_STRLEN) == 0) {
 633                                 strfree(parent);
 634                                 return (EEXIST);
 635                         }
 636         }
 637
 638         strfree(parent);
 639         return (0);
 640 }
 641
 642 void
 643 __kstat_install(kstat_t *ksp)
 644 {
 645         kstat_module_t *module;
 646         kstat_t *tmp;
 647
 648         ASSERT(ksp);
 649
 650         mutex_enter(&kstat_module_lock);
 651
 652         module = kstat_find_module(ksp->ks_module);
 653         if (module == NULL) {
 654                 if (kstat_detect_collision(ksp) != 0) {
 655                         cmn_err(CE_WARN, "kstat_create('%s', '%s'): namespace" \
 656                             " collision", ksp->ks_module, ksp->ks_name);
 657                         goto out;
 658                 }
 659                 module = kstat_create_module(ksp->ks_module);
 660                 if (module == NULL)
 661                         goto out;
 662         }
 663
 664         /*
 665          * Only one entry by this name per-module, on failure the module
 666          * shouldn't be deleted because we know it has at least one entry.
 667          */
 668         list_for_each_entry(tmp, &module->ksm_kstat_list, ks_list)
 669                 if (strncmp(tmp->ks_name, ksp->ks_name, KSTAT_STRLEN) == 0)
 670                         goto out;
 671
 672         list_add_tail(&ksp->ks_list, &module->ksm_kstat_list);
 673
 674         mutex_enter(ksp->ks_lock);
 675         ksp->ks_owner = module;
 676         ksp->ks_proc = proc_create_data(ksp->ks_name, 0644,
 677             module->ksm_proc, &proc_kstat_operations, (void *)ksp);
 678         if (ksp->ks_proc == NULL) {
 679                 list_del_init(&ksp->ks_list);
 680                 if (list_empty(&module->ksm_kstat_list))
 681                         kstat_delete_module(module);
 682         }
 683         mutex_exit(ksp->ks_lock);
 684 out:
 685         mutex_exit(&kstat_module_lock);
 686 }
 687 EXPORT_SYMBOL(__kstat_install);
 688
 689 void
 690 __kstat_delete(kstat_t *ksp)
 691 {
 692         kstat_module_t *module = ksp->ks_owner;
 693
 694         mutex_enter(&kstat_module_lock);
 695         list_del_init(&ksp->ks_list);
 696         mutex_exit(&kstat_module_lock);
 697
 698         if (ksp->ks_proc) {
 699                 remove_proc_entry(ksp->ks_name, module->ksm_proc);
 700
 701                 /* Remove top level module directory if it's empty */
 702                 if (list_empty(&module->ksm_kstat_list))
 703                         kstat_delete_module(module);
 704         }
 705
 706         if (!(ksp->ks_flags & KSTAT_FLAG_VIRTUAL))
 707                 kmem_free(ksp->ks_data, ksp->ks_data_size);
 708
 709         ksp->ks_lock = NULL;
 710         mutex_destroy(&ksp->ks_private_lock);
 711         kmem_free(ksp, sizeof (*ksp));
 712 }
 713 EXPORT_SYMBOL(__kstat_delete);
 714
 715 int
 716 spl_kstat_init(void)
 717 {
 718         mutex_init(&kstat_module_lock, NULL, MUTEX_DEFAULT, NULL);
 719         INIT_LIST_HEAD(&kstat_module_list);
 720         kstat_id = 0;
 721         return (0);
 722 }
 723
 724 void
 725 spl_kstat_fini(void)
 726 {
 727         ASSERT(list_empty(&kstat_module_list));
 728         mutex_destroy(&kstat_module_lock);
 729 }