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