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   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * dlmdebug.c
   5  *
   6  * debug functionality for the dlm
   7  *
   8  * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  *
  25  */
  26
  27 #include <linux/types.h>
  28 #include <linux/slab.h>
  29 #include <linux/highmem.h>
  30 #include <linux/utsname.h>
  31 #include <linux/sysctl.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/debugfs.h>
  34
  35 #include "cluster/heartbeat.h"
  36 #include "cluster/nodemanager.h"
  37 #include "cluster/tcp.h"
  38
  39 #include "dlmapi.h"
  40 #include "dlmcommon.h"
  41 #include "dlmdomain.h"
  42 #include "dlmdebug.h"
  43
  44 #define MLOG_MASK_PREFIX ML_DLM
  45 #include "cluster/masklog.h"
  46
  47 static int stringify_lockname(const char *lockname, int locklen, char *buf,
  48                               int len);
  49
  50 void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
  51 {
  52         spin_lock(&res->spinlock);
  53         __dlm_print_one_lock_resource(res);
  54         spin_unlock(&res->spinlock);
  55 }
  56
  57 static void dlm_print_lockres_refmap(struct dlm_lock_resource *res)
  58 {
  59         int bit;
  60         assert_spin_locked(&res->spinlock);
  61
  62         printk("  refmap nodes: [ ");
  63         bit = 0;
  64         while (1) {
  65                 bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit);
  66                 if (bit >= O2NM_MAX_NODES)
  67                         break;
  68                 printk("%u ", bit);
  69                 bit++;
  70         }
  71         printk("], inflight=%u\n", res->inflight_locks);
  72 }
  73
  74 static void __dlm_print_lock(struct dlm_lock *lock)
  75 {
  76         spin_lock(&lock->spinlock);
  77
  78         printk("    type=%d, conv=%d, node=%u, cookie=%u:%llu, "
  79                "ref=%u, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c), "
  80                "pending=(conv=%c,lock=%c,cancel=%c,unlock=%c)\n",
  81                lock->ml.type, lock->ml.convert_type, lock->ml.node,
  82                dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
  83                dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
  84                atomic_read(&lock->lock_refs.refcount),
  85                (list_empty(&lock->ast_list) ? 'y' : 'n'),
  86                (lock->ast_pending ? 'y' : 'n'),
  87                (list_empty(&lock->bast_list) ? 'y' : 'n'),
  88                (lock->bast_pending ? 'y' : 'n'),
  89                (lock->convert_pending ? 'y' : 'n'),
  90                (lock->lock_pending ? 'y' : 'n'),
  91                (lock->cancel_pending ? 'y' : 'n'),
  92                (lock->unlock_pending ? 'y' : 'n'));
  93
  94         spin_unlock(&lock->spinlock);
  95 }
  96
  97 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
  98 {
  99         struct list_head *iter2;
 100         struct dlm_lock *lock;
 101         char buf[DLM_LOCKID_NAME_MAX];
 102
 103         assert_spin_locked(&res->spinlock);
 104
 105         stringify_lockname(res->lockname.name, res->lockname.len,
 106                            buf, sizeof(buf) - 1);
 107         printk("lockres: %s, owner=%u, state=%u\n",
 108                buf, res->owner, res->state);
 109         printk("  last used: %lu, refcnt: %u, on purge list: %s\n",
 110                res->last_used, atomic_read(&res->refs.refcount),
 111                list_empty(&res->purge) ? "no" : "yes");
 112         printk("  on dirty list: %s, on reco list: %s, "
 113                "migrating pending: %s\n",
 114                list_empty(&res->dirty) ? "no" : "yes",
 115                list_empty(&res->recovering) ? "no" : "yes",
 116                res->migration_pending ? "yes" : "no");
 117         printk("  inflight locks: %d, asts reserved: %d\n",
 118                res->inflight_locks, atomic_read(&res->asts_reserved));
 119         dlm_print_lockres_refmap(res);
 120         printk("  granted queue:\n");
 121         list_for_each(iter2, &res->granted) {
 122                 lock = list_entry(iter2, struct dlm_lock, list);
 123                 __dlm_print_lock(lock);
 124         }
 125         printk("  converting queue:\n");
 126         list_for_each(iter2, &res->converting) {
 127                 lock = list_entry(iter2, struct dlm_lock, list);
 128                 __dlm_print_lock(lock);
 129         }
 130         printk("  blocked queue:\n");
 131         list_for_each(iter2, &res->blocked) {
 132                 lock = list_entry(iter2, struct dlm_lock, list);
 133                 __dlm_print_lock(lock);
 134         }
 135 }
 136
 137 void dlm_print_one_lock(struct dlm_lock *lockid)
 138 {
 139         dlm_print_one_lock_resource(lockid->lockres);
 140 }
 141 EXPORT_SYMBOL_GPL(dlm_print_one_lock);
 142
 143 static const char *dlm_errnames[] = {
 144         [DLM_NORMAL] =                  "DLM_NORMAL",
 145         [DLM_GRANTED] =                 "DLM_GRANTED",
 146         [DLM_DENIED] =                  "DLM_DENIED",
 147         [DLM_DENIED_NOLOCKS] =          "DLM_DENIED_NOLOCKS",
 148         [DLM_WORKING] =                 "DLM_WORKING",
 149         [DLM_BLOCKED] =                 "DLM_BLOCKED",
 150         [DLM_BLOCKED_ORPHAN] =          "DLM_BLOCKED_ORPHAN",
 151         [DLM_DENIED_GRACE_PERIOD] =     "DLM_DENIED_GRACE_PERIOD",
 152         [DLM_SYSERR] =                  "DLM_SYSERR",
 153         [DLM_NOSUPPORT] =               "DLM_NOSUPPORT",
 154         [DLM_CANCELGRANT] =             "DLM_CANCELGRANT",
 155         [DLM_IVLOCKID] =                "DLM_IVLOCKID",
 156         [DLM_SYNC] =                    "DLM_SYNC",
 157         [DLM_BADTYPE] =                 "DLM_BADTYPE",
 158         [DLM_BADRESOURCE] =             "DLM_BADRESOURCE",
 159         [DLM_MAXHANDLES] =              "DLM_MAXHANDLES",
 160         [DLM_NOCLINFO] =                "DLM_NOCLINFO",
 161         [DLM_NOLOCKMGR] =               "DLM_NOLOCKMGR",
 162         [DLM_NOPURGED] =                "DLM_NOPURGED",
 163         [DLM_BADARGS] =                 "DLM_BADARGS",
 164         [DLM_VOID] =                    "DLM_VOID",
 165         [DLM_NOTQUEUED] =               "DLM_NOTQUEUED",
 166         [DLM_IVBUFLEN] =                "DLM_IVBUFLEN",
 167         [DLM_CVTUNGRANT] =              "DLM_CVTUNGRANT",
 168         [DLM_BADPARAM] =                "DLM_BADPARAM",
 169         [DLM_VALNOTVALID] =             "DLM_VALNOTVALID",
 170         [DLM_REJECTED] =                "DLM_REJECTED",
 171         [DLM_ABORT] =                   "DLM_ABORT",
 172         [DLM_CANCEL] =                  "DLM_CANCEL",
 173         [DLM_IVRESHANDLE] =             "DLM_IVRESHANDLE",
 174         [DLM_DEADLOCK] =                "DLM_DEADLOCK",
 175         [DLM_DENIED_NOASTS] =           "DLM_DENIED_NOASTS",
 176         [DLM_FORWARD] =                 "DLM_FORWARD",
 177         [DLM_TIMEOUT] =                 "DLM_TIMEOUT",
 178         [DLM_IVGROUPID] =               "DLM_IVGROUPID",
 179         [DLM_VERS_CONFLICT] =           "DLM_VERS_CONFLICT",
 180         [DLM_BAD_DEVICE_PATH] =         "DLM_BAD_DEVICE_PATH",
 181         [DLM_NO_DEVICE_PERMISSION] =    "DLM_NO_DEVICE_PERMISSION",
 182         [DLM_NO_CONTROL_DEVICE ] =      "DLM_NO_CONTROL_DEVICE ",
 183         [DLM_RECOVERING] =              "DLM_RECOVERING",
 184         [DLM_MIGRATING] =               "DLM_MIGRATING",
 185         [DLM_MAXSTATS] =                "DLM_MAXSTATS",
 186 };
 187
 188 static const char *dlm_errmsgs[] = {
 189         [DLM_NORMAL] =                  "request in progress",
 190         [DLM_GRANTED] =                 "request granted",
 191         [DLM_DENIED] =                  "request denied",
 192         [DLM_DENIED_NOLOCKS] =          "request denied, out of system resources",
 193         [DLM_WORKING] =                 "async request in progress",
 194         [DLM_BLOCKED] =                 "lock request blocked",
 195         [DLM_BLOCKED_ORPHAN] =          "lock request blocked by a orphan lock",
 196         [DLM_DENIED_GRACE_PERIOD] =     "topological change in progress",
 197         [DLM_SYSERR] =                  "system error",
 198         [DLM_NOSUPPORT] =               "unsupported",
 199         [DLM_CANCELGRANT] =             "can't cancel convert: already granted",
 200         [DLM_IVLOCKID] =                "bad lockid",
 201         [DLM_SYNC] =                    "synchronous request granted",
 202         [DLM_BADTYPE] =                 "bad resource type",
 203         [DLM_BADRESOURCE] =             "bad resource handle",
 204         [DLM_MAXHANDLES] =              "no more resource handles",
 205         [DLM_NOCLINFO] =                "can't contact cluster manager",
 206         [DLM_NOLOCKMGR] =               "can't contact lock manager",
 207         [DLM_NOPURGED] =                "can't contact purge daemon",
 208         [DLM_BADARGS] =                 "bad api args",
 209         [DLM_VOID] =                    "no status",
 210         [DLM_NOTQUEUED] =               "NOQUEUE was specified and request failed",
 211         [DLM_IVBUFLEN] =                "invalid resource name length",
 212         [DLM_CVTUNGRANT] =              "attempted to convert ungranted lock",
 213         [DLM_BADPARAM] =                "invalid lock mode specified",
 214         [DLM_VALNOTVALID] =             "value block has been invalidated",
 215         [DLM_REJECTED] =                "request rejected, unrecognized client",
 216         [DLM_ABORT] =                   "blocked lock request cancelled",
 217         [DLM_CANCEL] =                  "conversion request cancelled",
 218         [DLM_IVRESHANDLE] =             "invalid resource handle",
 219         [DLM_DEADLOCK] =                "deadlock recovery refused this request",
 220         [DLM_DENIED_NOASTS] =           "failed to allocate AST",
 221         [DLM_FORWARD] =                 "request must wait for primary's response",
 222         [DLM_TIMEOUT] =                 "timeout value for lock has expired",
 223         [DLM_IVGROUPID] =               "invalid group specification",
 224         [DLM_VERS_CONFLICT] =           "version conflicts prevent request handling",
 225         [DLM_BAD_DEVICE_PATH] =         "Locks device does not exist or path wrong",
 226         [DLM_NO_DEVICE_PERMISSION] =    "Client has insufficient perms for device",
 227         [DLM_NO_CONTROL_DEVICE] =       "Cannot set options on opened device ",
 228         [DLM_RECOVERING] =              "lock resource being recovered",
 229         [DLM_MIGRATING] =               "lock resource being migrated",
 230         [DLM_MAXSTATS] =                "invalid error number",
 231 };
 232
 233 const char *dlm_errmsg(enum dlm_status err)
 234 {
 235         if (err >= DLM_MAXSTATS || err < 0)
 236                 return dlm_errmsgs[DLM_MAXSTATS];
 237         return dlm_errmsgs[err];
 238 }
 239 EXPORT_SYMBOL_GPL(dlm_errmsg);
 240
 241 const char *dlm_errname(enum dlm_status err)
 242 {
 243         if (err >= DLM_MAXSTATS || err < 0)
 244                 return dlm_errnames[DLM_MAXSTATS];
 245         return dlm_errnames[err];
 246 }
 247 EXPORT_SYMBOL_GPL(dlm_errname);
 248
 249 /* NOTE: This function converts a lockname into a string. It uses knowledge
 250  * of the format of the lockname that should be outside the purview of the dlm.
 251  * We are adding only to make dlm debugging slightly easier.
 252  *
 253  * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
 254  */
 255 static int stringify_lockname(const char *lockname, int locklen, char *buf,
 256                               int len)
 257 {
 258         int out = 0;
 259         __be64 inode_blkno_be;
 260
 261 #define OCFS2_DENTRY_LOCK_INO_START     18
 262         if (*lockname == 'N') {
 263                 memcpy((__be64 *)&inode_blkno_be,
 264                        (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
 265                        sizeof(__be64));
 266                 out += snprintf(buf + out, len - out, "%.*s%08x",
 267                                 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
 268                                 (unsigned int)be64_to_cpu(inode_blkno_be));
 269         } else
 270                 out += snprintf(buf + out, len - out, "%.*s",
 271                                 locklen, lockname);
 272         return out;
 273 }
 274
 275 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
 276                              char *buf, int len)
 277 {
 278         int out = 0;
 279         int i = -1;
 280
 281         while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
 282                 out += snprintf(buf + out, len - out, "%d ", i);
 283
 284         return out;
 285 }
 286
 287 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
 288 {
 289         int out = 0;
 290         unsigned int namelen;
 291         const char *name;
 292         char *mle_type;
 293
 294         if (mle->type != DLM_MLE_MASTER) {
 295                 namelen = mle->u.name.len;
 296                 name = mle->u.name.name;
 297         } else {
 298                 namelen = mle->u.res->lockname.len;
 299                 name = mle->u.res->lockname.name;
 300         }
 301
 302         if (mle->type == DLM_MLE_BLOCK)
 303                 mle_type = "BLK";
 304         else if (mle->type == DLM_MLE_MASTER)
 305                 mle_type = "MAS";
 306         else
 307                 mle_type = "MIG";
 308
 309         out += stringify_lockname(name, namelen, buf + out, len - out);
 310         out += snprintf(buf + out, len - out,
 311                         "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
 312                         mle_type, mle->master, mle->new_master,
 313                         !list_empty(&mle->hb_events),
 314                         !!mle->inuse,
 315                         atomic_read(&mle->mle_refs.refcount));
 316
 317         out += snprintf(buf + out, len - out, "Maybe=");
 318         out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
 319                                  buf + out, len - out);
 320         out += snprintf(buf + out, len - out, "\n");
 321
 322         out += snprintf(buf + out, len - out, "Vote=");
 323         out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
 324                                  buf + out, len - out);
 325         out += snprintf(buf + out, len - out, "\n");
 326
 327         out += snprintf(buf + out, len - out, "Response=");
 328         out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
 329                                  buf + out, len - out);
 330         out += snprintf(buf + out, len - out, "\n");
 331
 332         out += snprintf(buf + out, len - out, "Node=");
 333         out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
 334                                  buf + out, len - out);
 335         out += snprintf(buf + out, len - out, "\n");
 336
 337         out += snprintf(buf + out, len - out, "\n");
 338
 339         return out;
 340 }
 341
 342 void dlm_print_one_mle(struct dlm_master_list_entry *mle)
 343 {
 344         char *buf;
 345
 346         buf = (char *) get_zeroed_page(GFP_NOFS);
 347         if (buf) {
 348                 dump_mle(mle, buf, PAGE_SIZE - 1);
 349                 free_page((unsigned long)buf);
 350         }
 351 }
 352
 353 #ifdef CONFIG_DEBUG_FS
 354
 355 static struct dentry *dlm_debugfs_root = NULL;
 356
 357 #define DLM_DEBUGFS_DIR                         "o2dlm"
 358 #define DLM_DEBUGFS_DLM_STATE                   "dlm_state"
 359 #define DLM_DEBUGFS_LOCKING_STATE               "locking_state"
 360 #define DLM_DEBUGFS_MLE_STATE                   "mle_state"
 361 #define DLM_DEBUGFS_PURGE_LIST                  "purge_list"
 362
 363 /* begin - utils funcs */
 364 static void dlm_debug_free(struct kref *kref)
 365 {
 366         struct dlm_debug_ctxt *dc;
 367
 368         dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
 369
 370         kfree(dc);
 371 }
 372
 373 static void dlm_debug_put(struct dlm_debug_ctxt *dc)
 374 {
 375         if (dc)
 376                 kref_put(&dc->debug_refcnt, dlm_debug_free);
 377 }
 378
 379 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
 380 {
 381         kref_get(&dc->debug_refcnt);
 382 }
 383
 384 static struct debug_buffer *debug_buffer_allocate(void)
 385 {
 386         struct debug_buffer *db = NULL;
 387
 388         db = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
 389         if (!db)
 390                 goto bail;
 391
 392         db->len = PAGE_SIZE;
 393         db->buf = kmalloc(db->len, GFP_KERNEL);
 394         if (!db->buf)
 395                 goto bail;
 396
 397         return db;
 398 bail:
 399         kfree(db);
 400         return NULL;
 401 }
 402
 403 static ssize_t debug_buffer_read(struct file *file, char __user *buf,
 404                                  size_t nbytes, loff_t *ppos)
 405 {
 406         struct debug_buffer *db = file->private_data;
 407
 408         return simple_read_from_buffer(buf, nbytes, ppos, db->buf, db->len);
 409 }
 410
 411 static loff_t debug_buffer_llseek(struct file *file, loff_t off, int whence)
 412 {
 413         struct debug_buffer *db = file->private_data;
 414         loff_t new = -1;
 415
 416         switch (whence) {
 417         case 0:
 418                 new = off;
 419                 break;
 420         case 1:
 421                 new = file->f_pos + off;
 422                 break;
 423         }
 424
 425         if (new < 0 || new > db->len)
 426                 return -EINVAL;
 427
 428         return (file->f_pos = new);
 429 }
 430
 431 static int debug_buffer_release(struct inode *inode, struct file *file)
 432 {
 433         struct debug_buffer *db = (struct debug_buffer *)file->private_data;
 434
 435         if (db)
 436                 kfree(db->buf);
 437         kfree(db);
 438
 439         return 0;
 440 }
 441 /* end - util funcs */
 442
 443 /* begin - purge list funcs */
 444 static int debug_purgelist_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 445 {
 446         struct dlm_lock_resource *res;
 447         int out = 0;
 448         unsigned long total = 0;
 449
 450         out += snprintf(db->buf + out, db->len - out,
 451                         "Dumping Purgelist for Domain: %s\n", dlm->name);
 452
 453         spin_lock(&dlm->spinlock);
 454         list_for_each_entry(res, &dlm->purge_list, purge) {
 455                 ++total;
 456                 if (db->len - out < 100)
 457                         continue;
 458                 spin_lock(&res->spinlock);
 459                 out += stringify_lockname(res->lockname.name,
 460                                           res->lockname.len,
 461                                           db->buf + out, db->len - out);
 462                 out += snprintf(db->buf + out, db->len - out, "\t%ld\n",
 463                                 (jiffies - res->last_used)/HZ);
 464                 spin_unlock(&res->spinlock);
 465         }
 466         spin_unlock(&dlm->spinlock);
 467
 468         out += snprintf(db->buf + out, db->len - out,
 469                         "Total on list: %ld\n", total);
 470
 471         return out;
 472 }
 473
 474 static int debug_purgelist_open(struct inode *inode, struct file *file)
 475 {
 476         struct dlm_ctxt *dlm = inode->i_private;
 477         struct debug_buffer *db;
 478
 479         db = debug_buffer_allocate();
 480         if (!db)
 481                 goto bail;
 482
 483         db->len = debug_purgelist_print(dlm, db);
 484
 485         file->private_data = db;
 486
 487         return 0;
 488 bail:
 489         return -ENOMEM;
 490 }
 491
 492 static struct file_operations debug_purgelist_fops = {
 493         .open =         debug_purgelist_open,
 494         .release =      debug_buffer_release,
 495         .read =         debug_buffer_read,
 496         .llseek =       debug_buffer_llseek,
 497 };
 498 /* end - purge list funcs */
 499
 500 /* begin - debug mle funcs */
 501 static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 502 {
 503         struct dlm_master_list_entry *mle;
 504         int out = 0;
 505         unsigned long total = 0;
 506
 507         out += snprintf(db->buf + out, db->len - out,
 508                         "Dumping MLEs for Domain: %s\n", dlm->name);
 509
 510         spin_lock(&dlm->master_lock);
 511         list_for_each_entry(mle, &dlm->master_list, list) {
 512                 ++total;
 513                 if (db->len - out < 200)
 514                         continue;
 515                 out += dump_mle(mle, db->buf + out, db->len - out);
 516         }
 517         spin_unlock(&dlm->master_lock);
 518
 519         out += snprintf(db->buf + out, db->len - out,
 520                         "Total on list: %ld\n", total);
 521         return out;
 522 }
 523
 524 static int debug_mle_open(struct inode *inode, struct file *file)
 525 {
 526         struct dlm_ctxt *dlm = inode->i_private;
 527         struct debug_buffer *db;
 528
 529         db = debug_buffer_allocate();
 530         if (!db)
 531                 goto bail;
 532
 533         db->len = debug_mle_print(dlm, db);
 534
 535         file->private_data = db;
 536
 537         return 0;
 538 bail:
 539         return -ENOMEM;
 540 }
 541
 542 static struct file_operations debug_mle_fops = {
 543         .open =         debug_mle_open,
 544         .release =      debug_buffer_release,
 545         .read =         debug_buffer_read,
 546         .llseek =       debug_buffer_llseek,
 547 };
 548
 549 /* end - debug mle funcs */
 550
 551 /* begin - debug lockres funcs */
 552 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
 553 {
 554         int out;
 555
 556 #define DEBUG_LOCK_VERSION      1
 557         spin_lock(&lock->spinlock);
 558         out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
 559                        "%d,%d,%d,%d\n",
 560                        DEBUG_LOCK_VERSION,
 561                        list_type, lock->ml.type, lock->ml.convert_type,
 562                        lock->ml.node,
 563                        dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
 564                        dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 565                        !list_empty(&lock->ast_list),
 566                        !list_empty(&lock->bast_list),
 567                        lock->ast_pending, lock->bast_pending,
 568                        lock->convert_pending, lock->lock_pending,
 569                        lock->cancel_pending, lock->unlock_pending,
 570                        atomic_read(&lock->lock_refs.refcount));
 571         spin_unlock(&lock->spinlock);
 572
 573         return out;
 574 }
 575
 576 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
 577 {
 578         struct dlm_lock *lock;
 579         int i;
 580         int out = 0;
 581
 582         out += snprintf(buf + out, len - out, "NAME:");
 583         out += stringify_lockname(res->lockname.name, res->lockname.len,
 584                                   buf + out, len - out);
 585         out += snprintf(buf + out, len - out, "\n");
 586
 587 #define DEBUG_LRES_VERSION      1
 588         out += snprintf(buf + out, len - out,
 589                         "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
 590                         DEBUG_LRES_VERSION,
 591                         res->owner, res->state, res->last_used,
 592                         !list_empty(&res->purge),
 593                         !list_empty(&res->dirty),
 594                         !list_empty(&res->recovering),
 595                         res->inflight_locks, res->migration_pending,
 596                         atomic_read(&res->asts_reserved),
 597                         atomic_read(&res->refs.refcount));
 598
 599         /* refmap */
 600         out += snprintf(buf + out, len - out, "RMAP:");
 601         out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
 602                                  buf + out, len - out);
 603         out += snprintf(buf + out, len - out, "\n");
 604
 605         /* lvb */
 606         out += snprintf(buf + out, len - out, "LVBX:");
 607         for (i = 0; i < DLM_LVB_LEN; i++)
 608                 out += snprintf(buf + out, len - out,
 609                                         "%02x", (unsigned char)res->lvb[i]);
 610         out += snprintf(buf + out, len - out, "\n");
 611
 612         /* granted */
 613         list_for_each_entry(lock, &res->granted, list)
 614                 out += dump_lock(lock, 0, buf + out, len - out);
 615
 616         /* converting */
 617         list_for_each_entry(lock, &res->converting, list)
 618                 out += dump_lock(lock, 1, buf + out, len - out);
 619
 620         /* blocked */
 621         list_for_each_entry(lock, &res->blocked, list)
 622                 out += dump_lock(lock, 2, buf + out, len - out);
 623
 624         out += snprintf(buf + out, len - out, "\n");
 625
 626         return out;
 627 }
 628
 629 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
 630 {
 631         struct debug_lockres *dl = m->private;
 632         struct dlm_ctxt *dlm = dl->dl_ctxt;
 633         struct dlm_lock_resource *res = NULL;
 634
 635         spin_lock(&dlm->spinlock);
 636
 637         if (dl->dl_res) {
 638                 list_for_each_entry(res, &dl->dl_res->tracking, tracking) {
 639                         if (dl->dl_res) {
 640                                 dlm_lockres_put(dl->dl_res);
 641                                 dl->dl_res = NULL;
 642                         }
 643                         if (&res->tracking == &dlm->tracking_list) {
 644                                 mlog(0, "End of list found, %p\n", res);
 645                                 dl = NULL;
 646                                 break;
 647                         }
 648                         dlm_lockres_get(res);
 649                         dl->dl_res = res;
 650                         break;
 651                 }
 652         } else {
 653                 if (!list_empty(&dlm->tracking_list)) {
 654                         list_for_each_entry(res, &dlm->tracking_list, tracking)
 655                                 break;
 656                         dlm_lockres_get(res);
 657                         dl->dl_res = res;
 658                 } else
 659                         dl = NULL;
 660         }
 661
 662         if (dl) {
 663                 spin_lock(&dl->dl_res->spinlock);
 664                 dump_lockres(dl->dl_res, dl->dl_buf, dl->dl_len - 1);
 665                 spin_unlock(&dl->dl_res->spinlock);
 666         }
 667
 668         spin_unlock(&dlm->spinlock);
 669
 670         return dl;
 671 }
 672
 673 static void lockres_seq_stop(struct seq_file *m, void *v)
 674 {
 675 }
 676
 677 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
 678 {
 679         return NULL;
 680 }
 681
 682 static int lockres_seq_show(struct seq_file *s, void *v)
 683 {
 684         struct debug_lockres *dl = (struct debug_lockres *)v;
 685
 686         seq_printf(s, "%s", dl->dl_buf);
 687
 688         return 0;
 689 }
 690
 691 static struct seq_operations debug_lockres_ops = {
 692         .start =        lockres_seq_start,
 693         .stop =         lockres_seq_stop,
 694         .next =         lockres_seq_next,
 695         .show =         lockres_seq_show,
 696 };
 697
 698 static int debug_lockres_open(struct inode *inode, struct file *file)
 699 {
 700         struct dlm_ctxt *dlm = inode->i_private;
 701         int ret = -ENOMEM;
 702         struct seq_file *seq;
 703         struct debug_lockres *dl = NULL;
 704
 705         dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
 706         if (!dl) {
 707                 mlog_errno(ret);
 708                 goto bail;
 709         }
 710
 711         dl->dl_len = PAGE_SIZE;
 712         dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
 713         if (!dl->dl_buf) {
 714                 mlog_errno(ret);
 715                 goto bail;
 716         }
 717
 718         ret = seq_open(file, &debug_lockres_ops);
 719         if (ret) {
 720                 mlog_errno(ret);
 721                 goto bail;
 722         }
 723
 724         seq = (struct seq_file *) file->private_data;
 725         seq->private = dl;
 726
 727         dlm_grab(dlm);
 728         dl->dl_ctxt = dlm;
 729
 730         return 0;
 731 bail:
 732         if (dl)
 733                 kfree(dl->dl_buf);
 734         kfree(dl);
 735         return ret;
 736 }
 737
 738 static int debug_lockres_release(struct inode *inode, struct file *file)
 739 {
 740         struct seq_file *seq = (struct seq_file *)file->private_data;
 741         struct debug_lockres *dl = (struct debug_lockres *)seq->private;
 742
 743         if (dl->dl_res)
 744                 dlm_lockres_put(dl->dl_res);
 745         dlm_put(dl->dl_ctxt);
 746         kfree(dl->dl_buf);
 747         return seq_release_private(inode, file);
 748 }
 749
 750 static struct file_operations debug_lockres_fops = {
 751         .open =         debug_lockres_open,
 752         .release =      debug_lockres_release,
 753         .read =         seq_read,
 754         .llseek =       seq_lseek,
 755 };
 756 /* end - debug lockres funcs */
 757
 758 /* begin - debug state funcs */
 759 static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 760 {
 761         int out = 0;
 762         struct dlm_reco_node_data *node;
 763         char *state;
 764         int lres, rres, ures, tres;
 765
 766         lres = atomic_read(&dlm->local_resources);
 767         rres = atomic_read(&dlm->remote_resources);
 768         ures = atomic_read(&dlm->unknown_resources);
 769         tres = lres + rres + ures;
 770
 771         spin_lock(&dlm->spinlock);
 772
 773         switch (dlm->dlm_state) {
 774         case DLM_CTXT_NEW:
 775                 state = "NEW"; break;
 776         case DLM_CTXT_JOINED:
 777                 state = "JOINED"; break;
 778         case DLM_CTXT_IN_SHUTDOWN:
 779                 state = "SHUTDOWN"; break;
 780         case DLM_CTXT_LEAVING:
 781                 state = "LEAVING"; break;
 782         default:
 783                 state = "UNKNOWN"; break;
 784         }
 785
 786         /* Domain: xxxxxxxxxx  Key: 0xdfbac769 */
 787         out += snprintf(db->buf + out, db->len - out,
 788                         "Domain: %s  Key: 0x%08x\n", dlm->name, dlm->key);
 789
 790         /* Thread Pid: xxx  Node: xxx  State: xxxxx */
 791         out += snprintf(db->buf + out, db->len - out,
 792                         "Thread Pid: %d  Node: %d  State: %s\n",
 793                         dlm->dlm_thread_task->pid, dlm->node_num, state);
 794
 795         /* Number of Joins: xxx  Joining Node: xxx */
 796         out += snprintf(db->buf + out, db->len - out,
 797                         "Number of Joins: %d  Joining Node: %d\n",
 798                         dlm->num_joins, dlm->joining_node);
 799
 800         /* Domain Map: xx xx xx */
 801         out += snprintf(db->buf + out, db->len - out, "Domain Map: ");
 802         out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
 803                                  db->buf + out, db->len - out);
 804         out += snprintf(db->buf + out, db->len - out, "\n");
 805
 806         /* Live Map: xx xx xx */
 807         out += snprintf(db->buf + out, db->len - out, "Live Map: ");
 808         out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
 809                                  db->buf + out, db->len - out);
 810         out += snprintf(db->buf + out, db->len - out, "\n");
 811
 812         /* Mastered Resources Total: xxx  Locally: xxx  Remotely: ... */
 813         out += snprintf(db->buf + out, db->len - out,
 814                         "Mastered Resources Total: %d  Locally: %d  "
 815                         "Remotely: %d  Unknown: %d\n",
 816                         tres, lres, rres, ures);
 817
 818         /* Lists: Dirty=Empty  Purge=InUse  PendingASTs=Empty  ... */
 819         out += snprintf(db->buf + out, db->len - out,
 820                         "Lists: Dirty=%s  Purge=%s  PendingASTs=%s  "
 821                         "PendingBASTs=%s  Master=%s\n",
 822                         (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
 823                         (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
 824                         (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
 825                         (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"),
 826                         (list_empty(&dlm->master_list) ? "Empty" : "InUse"));
 827
 828         /* Purge Count: xxx  Refs: xxx */
 829         out += snprintf(db->buf + out, db->len - out,
 830                         "Purge Count: %d  Refs: %d\n", dlm->purge_count,
 831                         atomic_read(&dlm->dlm_refs.refcount));
 832
 833         /* Dead Node: xxx */
 834         out += snprintf(db->buf + out, db->len - out,
 835                         "Dead Node: %d\n", dlm->reco.dead_node);
 836
 837         /* What about DLM_RECO_STATE_FINALIZE? */
 838         if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
 839                 state = "ACTIVE";
 840         else
 841                 state = "INACTIVE";
 842
 843         /* Recovery Pid: xxxx  Master: xxx  State: xxxx */
 844         out += snprintf(db->buf + out, db->len - out,
 845                         "Recovery Pid: %d  Master: %d  State: %s\n",
 846                         dlm->dlm_reco_thread_task->pid,
 847                         dlm->reco.new_master, state);
 848
 849         /* Recovery Map: xx xx */
 850         out += snprintf(db->buf + out, db->len - out, "Recovery Map: ");
 851         out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
 852                                  db->buf + out, db->len - out);
 853         out += snprintf(db->buf + out, db->len - out, "\n");
 854
 855         /* Recovery Node State: */
 856         out += snprintf(db->buf + out, db->len - out, "Recovery Node State:\n");
 857         list_for_each_entry(node, &dlm->reco.node_data, list) {
 858                 switch (node->state) {
 859                 case DLM_RECO_NODE_DATA_INIT:
 860                         state = "INIT";
 861                         break;
 862                 case DLM_RECO_NODE_DATA_REQUESTING:
 863                         state = "REQUESTING";
 864                         break;
 865                 case DLM_RECO_NODE_DATA_DEAD:
 866                         state = "DEAD";
 867                         break;
 868                 case DLM_RECO_NODE_DATA_RECEIVING:
 869                         state = "RECEIVING";
 870                         break;
 871                 case DLM_RECO_NODE_DATA_REQUESTED:
 872                         state = "REQUESTED";
 873                         break;
 874                 case DLM_RECO_NODE_DATA_DONE:
 875                         state = "DONE";
 876                         break;
 877                 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
 878                         state = "FINALIZE-SENT";
 879                         break;
 880                 default:
 881                         state = "BAD";
 882                         break;
 883                 }
 884                 out += snprintf(db->buf + out, db->len - out, "\t%u - %s\n",
 885                                 node->node_num, state);
 886         }
 887
 888         spin_unlock(&dlm->spinlock);
 889
 890         return out;
 891 }
 892
 893 static int debug_state_open(struct inode *inode, struct file *file)
 894 {
 895         struct dlm_ctxt *dlm = inode->i_private;
 896         struct debug_buffer *db = NULL;
 897
 898         db = debug_buffer_allocate();
 899         if (!db)
 900                 goto bail;
 901
 902         db->len = debug_state_print(dlm, db);
 903
 904         file->private_data = db;
 905
 906         return 0;
 907 bail:
 908         return -ENOMEM;
 909 }
 910
 911 static struct file_operations debug_state_fops = {
 912         .open =         debug_state_open,
 913         .release =      debug_buffer_release,
 914         .read =         debug_buffer_read,
 915         .llseek =       debug_buffer_llseek,
 916 };
 917 /* end  - debug state funcs */
 918
 919 /* files in subroot */
 920 int dlm_debug_init(struct dlm_ctxt *dlm)
 921 {
 922         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
 923
 924         /* for dumping dlm_ctxt */
 925         dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
 926                                                      S_IFREG|S_IRUSR,
 927                                                      dlm->dlm_debugfs_subroot,
 928                                                      dlm, &debug_state_fops);
 929         if (!dc->debug_state_dentry) {
 930                 mlog_errno(-ENOMEM);
 931                 goto bail;
 932         }
 933
 934         /* for dumping lockres */
 935         dc->debug_lockres_dentry =
 936                         debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
 937                                             S_IFREG|S_IRUSR,
 938                                             dlm->dlm_debugfs_subroot,
 939                                             dlm, &debug_lockres_fops);
 940         if (!dc->debug_lockres_dentry) {
 941                 mlog_errno(-ENOMEM);
 942                 goto bail;
 943         }
 944
 945         /* for dumping mles */
 946         dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
 947                                                    S_IFREG|S_IRUSR,
 948                                                    dlm->dlm_debugfs_subroot,
 949                                                    dlm, &debug_mle_fops);
 950         if (!dc->debug_mle_dentry) {
 951                 mlog_errno(-ENOMEM);
 952                 goto bail;
 953         }
 954
 955         /* for dumping lockres on the purge list */
 956         dc->debug_purgelist_dentry =
 957                         debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
 958                                             S_IFREG|S_IRUSR,
 959                                             dlm->dlm_debugfs_subroot,
 960                                             dlm, &debug_purgelist_fops);
 961         if (!dc->debug_purgelist_dentry) {
 962                 mlog_errno(-ENOMEM);
 963                 goto bail;
 964         }
 965
 966         dlm_debug_get(dc);
 967         return 0;
 968
 969 bail:
 970         dlm_debug_shutdown(dlm);
 971         return -ENOMEM;
 972 }
 973
 974 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
 975 {
 976         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
 977
 978         if (dc) {
 979                 if (dc->debug_purgelist_dentry)
 980                         debugfs_remove(dc->debug_purgelist_dentry);
 981                 if (dc->debug_mle_dentry)
 982                         debugfs_remove(dc->debug_mle_dentry);
 983                 if (dc->debug_lockres_dentry)
 984                         debugfs_remove(dc->debug_lockres_dentry);
 985                 if (dc->debug_state_dentry)
 986                         debugfs_remove(dc->debug_state_dentry);
 987                 dlm_debug_put(dc);
 988         }
 989 }
 990
 991 /* subroot - domain dir */
 992 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
 993 {
 994         dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
 995                                                       dlm_debugfs_root);
 996         if (!dlm->dlm_debugfs_subroot) {
 997                 mlog_errno(-ENOMEM);
 998                 goto bail;
 999         }
1000
1001         dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
1002                                       GFP_KERNEL);
1003         if (!dlm->dlm_debug_ctxt) {
1004                 mlog_errno(-ENOMEM);
1005                 goto bail;
1006         }
1007         kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
1008
1009         return 0;
1010 bail:
1011         dlm_destroy_debugfs_subroot(dlm);
1012         return -ENOMEM;
1013 }
1014
1015 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
1016 {
1017         if (dlm->dlm_debugfs_subroot)
1018                 debugfs_remove(dlm->dlm_debugfs_subroot);
1019 }
1020
1021 /* debugfs root */
1022 int dlm_create_debugfs_root(void)
1023 {
1024         dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
1025         if (!dlm_debugfs_root) {
1026                 mlog_errno(-ENOMEM);
1027                 return -ENOMEM;
1028         }
1029         return 0;
1030 }
1031
1032 void dlm_destroy_debugfs_root(void)
1033 {
1034         if (dlm_debugfs_root)
1035                 debugfs_remove(dlm_debugfs_root);
1036 }
1037 #endif  /* CONFIG_DEBUG_FS */