git.oblomov.eu Git - linux-2.6/blob - fs/ocfs2/dlm/dlmdebug.c

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