fs/dlm/debug_fs.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) 2005-2008 Red Hat, Inc.  All rights reserved.
   5 **
   6 **  This copyrighted material is made available to anyone wishing to use,
   7 **  modify, copy, or redistribute it subject to the terms and conditions
   8 **  of the GNU General Public License v.2.
   9 **
  10 *******************************************************************************
  11 ******************************************************************************/
  12
  13 #include <linux/pagemap.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/module.h>
  16 #include <linux/ctype.h>
  17 #include <linux/debugfs.h>
  18
  19 #include "dlm_internal.h"
  20 #include "lock.h"
  21
  22 #define DLM_DEBUG_BUF_LEN 4096
  23 static char debug_buf[DLM_DEBUG_BUF_LEN];
  24 static struct mutex debug_buf_lock;
  25
  26 static struct dentry *dlm_root;
  27
  28 struct rsb_iter {
  29         int entry;
  30         int format;
  31         int header;
  32         struct dlm_ls *ls;
  33         struct list_head *next;
  34         struct dlm_rsb *rsb;
  35 };
  36
  37 /*
  38  * dump all rsb's in the lockspace hash table
  39  */
  40
  41 static char *print_lockmode(int mode)
  42 {
  43         switch (mode) {
  44         case DLM_LOCK_IV:
  45                 return "--";
  46         case DLM_LOCK_NL:
  47                 return "NL";
  48         case DLM_LOCK_CR:
  49                 return "CR";
  50         case DLM_LOCK_CW:
  51                 return "CW";
  52         case DLM_LOCK_PR:
  53                 return "PR";
  54         case DLM_LOCK_PW:
  55                 return "PW";
  56         case DLM_LOCK_EX:
  57                 return "EX";
  58         default:
  59                 return "??";
  60         }
  61 }
  62
  63 static void print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
  64                                struct dlm_rsb *res)
  65 {
  66         seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode));
  67
  68         if (lkb->lkb_status == DLM_LKSTS_CONVERT
  69             || lkb->lkb_status == DLM_LKSTS_WAITING)
  70                 seq_printf(s, " (%s)", print_lockmode(lkb->lkb_rqmode));
  71
  72         if (lkb->lkb_nodeid) {
  73                 if (lkb->lkb_nodeid != res->res_nodeid)
  74                         seq_printf(s, " Remote: %3d %08x", lkb->lkb_nodeid,
  75                                    lkb->lkb_remid);
  76                 else
  77                         seq_printf(s, " Master:     %08x", lkb->lkb_remid);
  78         }
  79
  80         if (lkb->lkb_wait_type)
  81                 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
  82
  83         seq_printf(s, "\n");
  84 }
  85
  86 static int print_format1(struct dlm_rsb *res, struct seq_file *s)
  87 {
  88         struct dlm_lkb *lkb;
  89         int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list;
  90
  91         lock_rsb(res);
  92
  93         seq_printf(s, "\nResource %p Name (len=%d) \"", res, res->res_length);
  94         for (i = 0; i < res->res_length; i++) {
  95                 if (isprint(res->res_name[i]))
  96                         seq_printf(s, "%c", res->res_name[i]);
  97                 else
  98                         seq_printf(s, "%c", '.');
  99         }
 100         if (res->res_nodeid > 0)
 101                 seq_printf(s, "\"  \nLocal Copy, Master is node %d\n",
 102                            res->res_nodeid);
 103         else if (res->res_nodeid == 0)
 104                 seq_printf(s, "\"  \nMaster Copy\n");
 105         else if (res->res_nodeid == -1)
 106                 seq_printf(s, "\"  \nLooking up master (lkid %x)\n",
 107                            res->res_first_lkid);
 108         else
 109                 seq_printf(s, "\"  \nInvalid master %d\n", res->res_nodeid);
 110
 111         /* Print the LVB: */
 112         if (res->res_lvbptr) {
 113                 seq_printf(s, "LVB: ");
 114                 for (i = 0; i < lvblen; i++) {
 115                         if (i == lvblen / 2)
 116                                 seq_printf(s, "\n     ");
 117                         seq_printf(s, "%02x ",
 118                                    (unsigned char) res->res_lvbptr[i]);
 119                 }
 120                 if (rsb_flag(res, RSB_VALNOTVALID))
 121                         seq_printf(s, " (INVALID)");
 122                 seq_printf(s, "\n");
 123         }
 124
 125         root_list = !list_empty(&res->res_root_list);
 126         recover_list = !list_empty(&res->res_recover_list);
 127
 128         if (root_list || recover_list) {
 129                 seq_printf(s, "Recovery: root %d recover %d flags %lx "
 130                            "count %d\n", root_list, recover_list,
 131                            res->res_flags, res->res_recover_locks_count);
 132         }
 133
 134         /* Print the locks attached to this resource */
 135         seq_printf(s, "Granted Queue\n");
 136         list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue)
 137                 print_format1_lock(s, lkb, res);
 138
 139         seq_printf(s, "Conversion Queue\n");
 140         list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue)
 141                 print_format1_lock(s, lkb, res);
 142
 143         seq_printf(s, "Waiting Queue\n");
 144         list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue)
 145                 print_format1_lock(s, lkb, res);
 146
 147         if (list_empty(&res->res_lookup))
 148                 goto out;
 149
 150         seq_printf(s, "Lookup Queue\n");
 151         list_for_each_entry(lkb, &res->res_lookup, lkb_rsb_lookup) {
 152                 seq_printf(s, "%08x %s", lkb->lkb_id,
 153                            print_lockmode(lkb->lkb_rqmode));
 154                 if (lkb->lkb_wait_type)
 155                         seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
 156                 seq_printf(s, "\n");
 157         }
 158  out:
 159         unlock_rsb(res);
 160         return 0;
 161 }
 162
 163 static void print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
 164                                struct dlm_rsb *r)
 165 {
 166         u64 xid = 0;
 167         u64 us;
 168
 169         if (lkb->lkb_flags & DLM_IFL_USER) {
 170                 if (lkb->lkb_ua)
 171                         xid = lkb->lkb_ua->xid;
 172         }
 173
 174         /* microseconds since lkb was added to current queue */
 175         us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_timestamp));
 176
 177         /* id nodeid remid pid xid exflags flags sts grmode rqmode time_us
 178            r_nodeid r_len r_name */
 179
 180         seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n",
 181                    lkb->lkb_id,
 182                    lkb->lkb_nodeid,
 183                    lkb->lkb_remid,
 184                    lkb->lkb_ownpid,
 185                    (unsigned long long)xid,
 186                    lkb->lkb_exflags,
 187                    lkb->lkb_flags,
 188                    lkb->lkb_status,
 189                    lkb->lkb_grmode,
 190                    lkb->lkb_rqmode,
 191                    (unsigned long long)us,
 192                    r->res_nodeid,
 193                    r->res_length,
 194                    r->res_name);
 195 }
 196
 197 static int print_format2(struct dlm_rsb *r, struct seq_file *s)
 198 {
 199         struct dlm_lkb *lkb;
 200
 201         lock_rsb(r);
 202
 203         list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue)
 204                 print_format2_lock(s, lkb, r);
 205
 206         list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue)
 207                 print_format2_lock(s, lkb, r);
 208
 209         list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue)
 210                 print_format2_lock(s, lkb, r);
 211
 212         unlock_rsb(r);
 213         return 0;
 214 }
 215
 216 static void print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
 217                                int rsb_lookup)
 218 {
 219         u64 xid = 0;
 220
 221         if (lkb->lkb_flags & DLM_IFL_USER) {
 222                 if (lkb->lkb_ua)
 223                         xid = lkb->lkb_ua->xid;
 224         }
 225
 226         seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n",
 227                    lkb->lkb_id,
 228                    lkb->lkb_nodeid,
 229                    lkb->lkb_remid,
 230                    lkb->lkb_ownpid,
 231                    (unsigned long long)xid,
 232                    lkb->lkb_exflags,
 233                    lkb->lkb_flags,
 234                    lkb->lkb_status,
 235                    lkb->lkb_grmode,
 236                    lkb->lkb_rqmode,
 237                    lkb->lkb_highbast,
 238                    rsb_lookup,
 239                    lkb->lkb_wait_type,
 240                    lkb->lkb_lvbseq,
 241                    (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
 242                    (unsigned long long)ktime_to_ns(lkb->lkb_time_bast));
 243 }
 244
 245 static int print_format3(struct dlm_rsb *r, struct seq_file *s)
 246 {
 247         struct dlm_lkb *lkb;
 248         int i, lvblen = r->res_ls->ls_lvblen;
 249         int print_name = 1;
 250
 251         lock_rsb(r);
 252
 253         seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ",
 254                    r,
 255                    r->res_nodeid,
 256                    r->res_first_lkid,
 257                    r->res_flags,
 258                    !list_empty(&r->res_root_list),
 259                    !list_empty(&r->res_recover_list),
 260                    r->res_recover_locks_count,
 261                    r->res_length);
 262
 263         for (i = 0; i < r->res_length; i++) {
 264                 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
 265                         print_name = 0;
 266         }
 267
 268         seq_printf(s, "%s", print_name ? "str " : "hex");
 269
 270         for (i = 0; i < r->res_length; i++) {
 271                 if (print_name)
 272                         seq_printf(s, "%c", r->res_name[i]);
 273                 else
 274                         seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
 275         }
 276         seq_printf(s, "\n");
 277
 278         if (!r->res_lvbptr)
 279                 goto do_locks;
 280
 281         seq_printf(s, "lvb %u %d", r->res_lvbseq, lvblen);
 282
 283         for (i = 0; i < lvblen; i++)
 284                 seq_printf(s, " %02x", (unsigned char)r->res_lvbptr[i]);
 285         seq_printf(s, "\n");
 286
 287  do_locks:
 288         list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue)
 289                 print_format3_lock(s, lkb, 0);
 290
 291         list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue)
 292                 print_format3_lock(s, lkb, 0);
 293
 294         list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue)
 295                 print_format3_lock(s, lkb, 0);
 296
 297         list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup)
 298                 print_format3_lock(s, lkb, 1);
 299
 300         unlock_rsb(r);
 301         return 0;
 302 }
 303
 304 static int rsb_iter_next(struct rsb_iter *ri)
 305 {
 306         struct dlm_ls *ls = ri->ls;
 307         int i;
 308
 309         if (!ri->next) {
 310  top:
 311                 /* Find the next non-empty hash bucket */
 312                 for (i = ri->entry; i < ls->ls_rsbtbl_size; i++) {
 313                         read_lock(&ls->ls_rsbtbl[i].lock);
 314                         if (!list_empty(&ls->ls_rsbtbl[i].list)) {
 315                                 ri->next = ls->ls_rsbtbl[i].list.next;
 316                                 ri->rsb = list_entry(ri->next, struct dlm_rsb,
 317                                                         res_hashchain);
 318                                 dlm_hold_rsb(ri->rsb);
 319                                 read_unlock(&ls->ls_rsbtbl[i].lock);
 320                                 break;
 321                         }
 322                         read_unlock(&ls->ls_rsbtbl[i].lock);
 323                 }
 324                 ri->entry = i;
 325
 326                 if (ri->entry >= ls->ls_rsbtbl_size)
 327                         return 1;
 328         } else {
 329                 struct dlm_rsb *old = ri->rsb;
 330                 i = ri->entry;
 331                 read_lock(&ls->ls_rsbtbl[i].lock);
 332                 ri->next = ri->next->next;
 333                 if (ri->next->next == ls->ls_rsbtbl[i].list.next) {
 334                         /* End of list - move to next bucket */
 335                         ri->next = NULL;
 336                         ri->entry++;
 337                         read_unlock(&ls->ls_rsbtbl[i].lock);
 338                         dlm_put_rsb(old);
 339                         goto top;
 340                 }
 341                 ri->rsb = list_entry(ri->next, struct dlm_rsb, res_hashchain);
 342                 dlm_hold_rsb(ri->rsb);
 343                 read_unlock(&ls->ls_rsbtbl[i].lock);
 344                 dlm_put_rsb(old);
 345         }
 346
 347         return 0;
 348 }
 349
 350 static void rsb_iter_free(struct rsb_iter *ri)
 351 {
 352         kfree(ri);
 353 }
 354
 355 static struct rsb_iter *rsb_iter_init(struct dlm_ls *ls)
 356 {
 357         struct rsb_iter *ri;
 358
 359         ri = kzalloc(sizeof *ri, GFP_KERNEL);
 360         if (!ri)
 361                 return NULL;
 362
 363         ri->ls = ls;
 364         ri->entry = 0;
 365         ri->next = NULL;
 366         ri->format = 1;
 367
 368         if (rsb_iter_next(ri)) {
 369                 rsb_iter_free(ri);
 370                 return NULL;
 371         }
 372
 373         return ri;
 374 }
 375
 376 static void *rsb_seq_start(struct seq_file *file, loff_t *pos)
 377 {
 378         struct rsb_iter *ri;
 379         loff_t n = *pos;
 380
 381         ri = rsb_iter_init(file->private);
 382         if (!ri)
 383                 return NULL;
 384
 385         while (n--) {
 386                 if (rsb_iter_next(ri)) {
 387                         rsb_iter_free(ri);
 388                         return NULL;
 389                 }
 390         }
 391
 392         return ri;
 393 }
 394
 395 static void *rsb_seq_next(struct seq_file *file, void *iter_ptr, loff_t *pos)
 396 {
 397         struct rsb_iter *ri = iter_ptr;
 398
 399         (*pos)++;
 400
 401         if (rsb_iter_next(ri)) {
 402                 rsb_iter_free(ri);
 403                 return NULL;
 404         }
 405
 406         return ri;
 407 }
 408
 409 static void rsb_seq_stop(struct seq_file *file, void *iter_ptr)
 410 {
 411         /* nothing for now */
 412 }
 413
 414 static int rsb_seq_show(struct seq_file *file, void *iter_ptr)
 415 {
 416         struct rsb_iter *ri = iter_ptr;
 417
 418         switch (ri->format) {
 419         case 1:
 420                 print_format1(ri->rsb, file);
 421                 break;
 422         case 2:
 423                 if (ri->header) {
 424                         seq_printf(file, "id nodeid remid pid xid exflags "
 425                                          "flags sts grmode rqmode time_ms "
 426                                          "r_nodeid r_len r_name\n");
 427                         ri->header = 0;
 428                 }
 429                 print_format2(ri->rsb, file);
 430                 break;
 431         case 3:
 432                 if (ri->header) {
 433                         seq_printf(file, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
 434                         ri->header = 0;
 435                 }
 436                 print_format3(ri->rsb, file);
 437                 break;
 438         }
 439
 440         return 0;
 441 }
 442
 443 static struct seq_operations rsb_seq_ops = {
 444         .start = rsb_seq_start,
 445         .next  = rsb_seq_next,
 446         .stop  = rsb_seq_stop,
 447         .show  = rsb_seq_show,
 448 };
 449
 450 static int rsb_open(struct inode *inode, struct file *file)
 451 {
 452         struct seq_file *seq;
 453         int ret;
 454
 455         ret = seq_open(file, &rsb_seq_ops);
 456         if (ret)
 457                 return ret;
 458
 459         seq = file->private_data;
 460         seq->private = inode->i_private;
 461
 462         return 0;
 463 }
 464
 465 static const struct file_operations rsb_fops = {
 466         .owner   = THIS_MODULE,
 467         .open    = rsb_open,
 468         .read    = seq_read,
 469         .llseek  = seq_lseek,
 470         .release = seq_release
 471 };
 472
 473 /*
 474  * Dump state in compact per-lock listing
 475  */
 476
 477 static struct rsb_iter *locks_iter_init(struct dlm_ls *ls, loff_t *pos)
 478 {
 479         struct rsb_iter *ri;
 480
 481         ri = kzalloc(sizeof *ri, GFP_KERNEL);
 482         if (!ri)
 483                 return NULL;
 484
 485         ri->ls = ls;
 486         ri->entry = 0;
 487         ri->next = NULL;
 488         ri->format = 2;
 489
 490         if (*pos == 0)
 491                 ri->header = 1;
 492
 493         if (rsb_iter_next(ri)) {
 494                 rsb_iter_free(ri);
 495                 return NULL;
 496         }
 497
 498         return ri;
 499 }
 500
 501 static void *locks_seq_start(struct seq_file *file, loff_t *pos)
 502 {
 503         struct rsb_iter *ri;
 504         loff_t n = *pos;
 505
 506         ri = locks_iter_init(file->private, pos);
 507         if (!ri)
 508                 return NULL;
 509
 510         while (n--) {
 511                 if (rsb_iter_next(ri)) {
 512                         rsb_iter_free(ri);
 513                         return NULL;
 514                 }
 515         }
 516
 517         return ri;
 518 }
 519
 520 static struct seq_operations locks_seq_ops = {
 521         .start = locks_seq_start,
 522         .next  = rsb_seq_next,
 523         .stop  = rsb_seq_stop,
 524         .show  = rsb_seq_show,
 525 };
 526
 527 static int locks_open(struct inode *inode, struct file *file)
 528 {
 529         struct seq_file *seq;
 530         int ret;
 531
 532         ret = seq_open(file, &locks_seq_ops);
 533         if (ret)
 534                 return ret;
 535
 536         seq = file->private_data;
 537         seq->private = inode->i_private;
 538
 539         return 0;
 540 }
 541
 542 static const struct file_operations locks_fops = {
 543         .owner   = THIS_MODULE,
 544         .open    = locks_open,
 545         .read    = seq_read,
 546         .llseek  = seq_lseek,
 547         .release = seq_release
 548 };
 549
 550 /*
 551  * Dump all rsb/lvb/lkb state in compact listing, more complete than _locks
 552  * This can replace both formats 1 and 2 eventually.
 553  */
 554
 555 static struct rsb_iter *all_iter_init(struct dlm_ls *ls, loff_t *pos)
 556 {
 557         struct rsb_iter *ri;
 558
 559         ri = kzalloc(sizeof *ri, GFP_KERNEL);
 560         if (!ri)
 561                 return NULL;
 562
 563         ri->ls = ls;
 564         ri->entry = 0;
 565         ri->next = NULL;
 566         ri->format = 3;
 567
 568         if (*pos == 0)
 569                 ri->header = 1;
 570
 571         if (rsb_iter_next(ri)) {
 572                 rsb_iter_free(ri);
 573                 return NULL;
 574         }
 575
 576         return ri;
 577 }
 578
 579 static void *all_seq_start(struct seq_file *file, loff_t *pos)
 580 {
 581         struct rsb_iter *ri;
 582         loff_t n = *pos;
 583
 584         ri = all_iter_init(file->private, pos);
 585         if (!ri)
 586                 return NULL;
 587
 588         while (n--) {
 589                 if (rsb_iter_next(ri)) {
 590                         rsb_iter_free(ri);
 591                         return NULL;
 592                 }
 593         }
 594
 595         return ri;
 596 }
 597
 598 static struct seq_operations all_seq_ops = {
 599         .start = all_seq_start,
 600         .next  = rsb_seq_next,
 601         .stop  = rsb_seq_stop,
 602         .show  = rsb_seq_show,
 603 };
 604
 605 static int all_open(struct inode *inode, struct file *file)
 606 {
 607         struct seq_file *seq;
 608         int ret;
 609
 610         ret = seq_open(file, &all_seq_ops);
 611         if (ret)
 612                 return ret;
 613
 614         seq = file->private_data;
 615         seq->private = inode->i_private;
 616
 617         return 0;
 618 }
 619
 620 static const struct file_operations all_fops = {
 621         .owner   = THIS_MODULE,
 622         .open    = all_open,
 623         .read    = seq_read,
 624         .llseek  = seq_lseek,
 625         .release = seq_release
 626 };
 627
 628 /*
 629  * dump lkb's on the ls_waiters list
 630  */
 631
 632 static int waiters_open(struct inode *inode, struct file *file)
 633 {
 634         file->private_data = inode->i_private;
 635         return 0;
 636 }
 637
 638 static ssize_t waiters_read(struct file *file, char __user *userbuf,
 639                             size_t count, loff_t *ppos)
 640 {
 641         struct dlm_ls *ls = file->private_data;
 642         struct dlm_lkb *lkb;
 643         size_t len = DLM_DEBUG_BUF_LEN, pos = 0, ret, rv;
 644
 645         mutex_lock(&debug_buf_lock);
 646         mutex_lock(&ls->ls_waiters_mutex);
 647         memset(debug_buf, 0, sizeof(debug_buf));
 648
 649         list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
 650                 ret = snprintf(debug_buf + pos, len - pos, "%x %d %d %s\n",
 651                                lkb->lkb_id, lkb->lkb_wait_type,
 652                                lkb->lkb_nodeid, lkb->lkb_resource->res_name);
 653                 if (ret >= len - pos)
 654                         break;
 655                 pos += ret;
 656         }
 657         mutex_unlock(&ls->ls_waiters_mutex);
 658
 659         rv = simple_read_from_buffer(userbuf, count, ppos, debug_buf, pos);
 660         mutex_unlock(&debug_buf_lock);
 661         return rv;
 662 }
 663
 664 static const struct file_operations waiters_fops = {
 665         .owner   = THIS_MODULE,
 666         .open    = waiters_open,
 667         .read    = waiters_read
 668 };
 669
 670 void dlm_delete_debug_file(struct dlm_ls *ls)
 671 {
 672         if (ls->ls_debug_rsb_dentry)
 673                 debugfs_remove(ls->ls_debug_rsb_dentry);
 674         if (ls->ls_debug_waiters_dentry)
 675                 debugfs_remove(ls->ls_debug_waiters_dentry);
 676         if (ls->ls_debug_locks_dentry)
 677                 debugfs_remove(ls->ls_debug_locks_dentry);
 678         if (ls->ls_debug_all_dentry)
 679                 debugfs_remove(ls->ls_debug_all_dentry);
 680 }
 681
 682 int dlm_create_debug_file(struct dlm_ls *ls)
 683 {
 684         char name[DLM_LOCKSPACE_LEN+8];
 685
 686         /* format 1 */
 687
 688         ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name,
 689                                                       S_IFREG | S_IRUGO,
 690                                                       dlm_root,
 691                                                       ls,
 692                                                       &rsb_fops);
 693         if (!ls->ls_debug_rsb_dentry)
 694                 goto fail;
 695
 696         /* format 2 */
 697
 698         memset(name, 0, sizeof(name));
 699         snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_locks", ls->ls_name);
 700
 701         ls->ls_debug_locks_dentry = debugfs_create_file(name,
 702                                                         S_IFREG | S_IRUGO,
 703                                                         dlm_root,
 704                                                         ls,
 705                                                         &locks_fops);
 706         if (!ls->ls_debug_locks_dentry)
 707                 goto fail;
 708
 709         /* format 3 */
 710
 711         memset(name, 0, sizeof(name));
 712         snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_all", ls->ls_name);
 713
 714         ls->ls_debug_all_dentry = debugfs_create_file(name,
 715                                                       S_IFREG | S_IRUGO,
 716                                                       dlm_root,
 717                                                       ls,
 718                                                       &all_fops);
 719         if (!ls->ls_debug_all_dentry)
 720                 goto fail;
 721
 722         memset(name, 0, sizeof(name));
 723         snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_waiters", ls->ls_name);
 724
 725         ls->ls_debug_waiters_dentry = debugfs_create_file(name,
 726                                                           S_IFREG | S_IRUGO,
 727                                                           dlm_root,
 728                                                           ls,
 729                                                           &waiters_fops);
 730         if (!ls->ls_debug_waiters_dentry)
 731                 goto fail;
 732
 733         return 0;
 734
 735  fail:
 736         dlm_delete_debug_file(ls);
 737         return -ENOMEM;
 738 }
 739
 740 int __init dlm_register_debugfs(void)
 741 {
 742         mutex_init(&debug_buf_lock);
 743         dlm_root = debugfs_create_dir("dlm", NULL);
 744         return dlm_root ? 0 : -ENOMEM;
 745 }
 746
 747 void dlm_unregister_debugfs(void)
 748 {
 749         debugfs_remove(dlm_root);
 750 }
 751