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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/sysctl.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/debugfs.h>
  33
  34 #include "cluster/heartbeat.h"
  35 #include "cluster/nodemanager.h"
  36 #include "cluster/tcp.h"
  37
  38 #include "dlmapi.h"
  39 #include "dlmcommon.h"
  40 #include "dlmdomain.h"
  41 #include "dlmdebug.h"
  42
  43 #define MLOG_MASK_PREFIX ML_DLM
  44 #include "cluster/masklog.h"
  45
  46 static int stringify_lockname(const char *lockname, int locklen, char *buf,
  47                               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 static int stringify_lockname(const char *lockname, int locklen, char *buf,
 255                               int len)
 256 {
 257         int out = 0;
 258         __be64 inode_blkno_be;
 259
 260 #define OCFS2_DENTRY_LOCK_INO_START     18
 261         if (*lockname == 'N') {
 262                 memcpy((__be64 *)&inode_blkno_be,
 263                        (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
 264                        sizeof(__be64));
 265                 out += snprintf(buf + out, len - out, "%.*s%08x",
 266                                 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
 267                                 (unsigned int)be64_to_cpu(inode_blkno_be));
 268         } else
 269                 out += snprintf(buf + out, len - out, "%.*s",
 270                                 locklen, lockname);
 271         return out;
 272 }
 273
 274 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
 275                              char *buf, int len)
 276 {
 277         int out = 0;
 278         int i = -1;
 279
 280         while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
 281                 out += snprintf(buf + out, len - out, "%d ", i);
 282
 283         return out;
 284 }
 285
 286 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
 287 {
 288         int out = 0;
 289         char *mle_type;
 290
 291         if (mle->type == DLM_MLE_BLOCK)
 292                 mle_type = "BLK";
 293         else if (mle->type == DLM_MLE_MASTER)
 294                 mle_type = "MAS";
 295         else
 296                 mle_type = "MIG";
 297
 298         out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out);
 299         out += snprintf(buf + out, len - out,
 300                         "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
 301                         mle_type, mle->master, mle->new_master,
 302                         !list_empty(&mle->hb_events),
 303                         !!mle->inuse,
 304                         atomic_read(&mle->mle_refs.refcount));
 305
 306         out += snprintf(buf + out, len - out, "Maybe=");
 307         out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
 308                                  buf + out, len - out);
 309         out += snprintf(buf + out, len - out, "\n");
 310
 311         out += snprintf(buf + out, len - out, "Vote=");
 312         out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
 313                                  buf + out, len - out);
 314         out += snprintf(buf + out, len - out, "\n");
 315
 316         out += snprintf(buf + out, len - out, "Response=");
 317         out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
 318                                  buf + out, len - out);
 319         out += snprintf(buf + out, len - out, "\n");
 320
 321         out += snprintf(buf + out, len - out, "Node=");
 322         out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
 323                                  buf + out, len - out);
 324         out += snprintf(buf + out, len - out, "\n");
 325
 326         out += snprintf(buf + out, len - out, "\n");
 327
 328         return out;
 329 }
 330
 331 void dlm_print_one_mle(struct dlm_master_list_entry *mle)
 332 {
 333         char *buf;
 334
 335         buf = (char *) get_zeroed_page(GFP_NOFS);
 336         if (buf) {
 337                 dump_mle(mle, buf, PAGE_SIZE - 1);
 338                 free_page((unsigned long)buf);
 339         }
 340 }
 341
 342 #ifdef CONFIG_DEBUG_FS
 343
 344 static struct dentry *dlm_debugfs_root = NULL;
 345
 346 #define DLM_DEBUGFS_DIR                         "o2dlm"
 347 #define DLM_DEBUGFS_DLM_STATE                   "dlm_state"
 348 #define DLM_DEBUGFS_LOCKING_STATE               "locking_state"
 349 #define DLM_DEBUGFS_MLE_STATE                   "mle_state"
 350 #define DLM_DEBUGFS_PURGE_LIST                  "purge_list"
 351
 352 /* begin - utils funcs */
 353 static void dlm_debug_free(struct kref *kref)
 354 {
 355         struct dlm_debug_ctxt *dc;
 356
 357         dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
 358
 359         kfree(dc);
 360 }
 361
 362 static void dlm_debug_put(struct dlm_debug_ctxt *dc)
 363 {
 364         if (dc)
 365                 kref_put(&dc->debug_refcnt, dlm_debug_free);
 366 }
 367
 368 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
 369 {
 370         kref_get(&dc->debug_refcnt);
 371 }
 372
 373 static struct debug_buffer *debug_buffer_allocate(void)
 374 {
 375         struct debug_buffer *db = NULL;
 376
 377         db = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
 378         if (!db)
 379                 goto bail;
 380
 381         db->len = PAGE_SIZE;
 382         db->buf = kmalloc(db->len, GFP_KERNEL);
 383         if (!db->buf)
 384                 goto bail;
 385
 386         return db;
 387 bail:
 388         kfree(db);
 389         return NULL;
 390 }
 391
 392 static ssize_t debug_buffer_read(struct file *file, char __user *buf,
 393                                  size_t nbytes, loff_t *ppos)
 394 {
 395         struct debug_buffer *db = file->private_data;
 396
 397         return simple_read_from_buffer(buf, nbytes, ppos, db->buf, db->len);
 398 }
 399
 400 static loff_t debug_buffer_llseek(struct file *file, loff_t off, int whence)
 401 {
 402         struct debug_buffer *db = file->private_data;
 403         loff_t new = -1;
 404
 405         switch (whence) {
 406         case 0:
 407                 new = off;
 408                 break;
 409         case 1:
 410                 new = file->f_pos + off;
 411                 break;
 412         }
 413
 414         if (new < 0 || new > db->len)
 415                 return -EINVAL;
 416
 417         return (file->f_pos = new);
 418 }
 419
 420 static int debug_buffer_release(struct inode *inode, struct file *file)
 421 {
 422         struct debug_buffer *db = (struct debug_buffer *)file->private_data;
 423
 424         if (db)
 425                 kfree(db->buf);
 426         kfree(db);
 427
 428         return 0;
 429 }
 430 /* end - util funcs */
 431
 432 /* begin - purge list funcs */
 433 static int debug_purgelist_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 434 {
 435         struct dlm_lock_resource *res;
 436         int out = 0;
 437         unsigned long total = 0;
 438
 439         out += snprintf(db->buf + out, db->len - out,
 440                         "Dumping Purgelist for Domain: %s\n", dlm->name);
 441
 442         spin_lock(&dlm->spinlock);
 443         list_for_each_entry(res, &dlm->purge_list, purge) {
 444                 ++total;
 445                 if (db->len - out < 100)
 446                         continue;
 447                 spin_lock(&res->spinlock);
 448                 out += stringify_lockname(res->lockname.name,
 449                                           res->lockname.len,
 450                                           db->buf + out, db->len - out);
 451                 out += snprintf(db->buf + out, db->len - out, "\t%ld\n",
 452                                 (jiffies - res->last_used)/HZ);
 453                 spin_unlock(&res->spinlock);
 454         }
 455         spin_unlock(&dlm->spinlock);
 456
 457         out += snprintf(db->buf + out, db->len - out,
 458                         "Total on list: %ld\n", total);
 459
 460         return out;
 461 }
 462
 463 static int debug_purgelist_open(struct inode *inode, struct file *file)
 464 {
 465         struct dlm_ctxt *dlm = inode->i_private;
 466         struct debug_buffer *db;
 467
 468         db = debug_buffer_allocate();
 469         if (!db)
 470                 goto bail;
 471
 472         db->len = debug_purgelist_print(dlm, db);
 473
 474         file->private_data = db;
 475
 476         return 0;
 477 bail:
 478         return -ENOMEM;
 479 }
 480
 481 static const struct file_operations debug_purgelist_fops = {
 482         .open =         debug_purgelist_open,
 483         .release =      debug_buffer_release,
 484         .read =         debug_buffer_read,
 485         .llseek =       debug_buffer_llseek,
 486 };
 487 /* end - purge list funcs */
 488
 489 /* begin - debug mle funcs */
 490 static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 491 {
 492         struct dlm_master_list_entry *mle;
 493         struct hlist_head *bucket;
 494         struct hlist_node *list;
 495         int i, out = 0;
 496         unsigned long total = 0, longest = 0, bktcnt;
 497
 498         out += snprintf(db->buf + out, db->len - out,
 499                         "Dumping MLEs for Domain: %s\n", dlm->name);
 500
 501         spin_lock(&dlm->master_lock);
 502         for (i = 0; i < DLM_HASH_BUCKETS; i++) {
 503                 bucket = dlm_master_hash(dlm, i);
 504                 hlist_for_each(list, bucket) {
 505                         mle = hlist_entry(list, struct dlm_master_list_entry,
 506                                           master_hash_node);
 507                         ++total;
 508                         ++bktcnt;
 509                         if (db->len - out < 200)
 510                                 continue;
 511                         out += dump_mle(mle, db->buf + out, db->len - out);
 512                 }
 513                 longest = max(longest, bktcnt);
 514                 bktcnt = 0;
 515         }
 516         spin_unlock(&dlm->master_lock);
 517
 518         out += snprintf(db->buf + out, db->len - out,
 519                         "Total: %ld, Longest: %ld\n", total, longest);
 520         return out;
 521 }
 522
 523 static int debug_mle_open(struct inode *inode, struct file *file)
 524 {
 525         struct dlm_ctxt *dlm = inode->i_private;
 526         struct debug_buffer *db;
 527
 528         db = debug_buffer_allocate();
 529         if (!db)
 530                 goto bail;
 531
 532         db->len = debug_mle_print(dlm, db);
 533
 534         file->private_data = db;
 535
 536         return 0;
 537 bail:
 538         return -ENOMEM;
 539 }
 540
 541 static const struct file_operations debug_mle_fops = {
 542         .open =         debug_mle_open,
 543         .release =      debug_buffer_release,
 544         .read =         debug_buffer_read,
 545         .llseek =       debug_buffer_llseek,
 546 };
 547
 548 /* end - debug mle funcs */
 549
 550 /* begin - debug lockres funcs */
 551 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
 552 {
 553         int out;
 554
 555 #define DEBUG_LOCK_VERSION      1
 556         spin_lock(&lock->spinlock);
 557         out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
 558                        "%d,%d,%d,%d\n",
 559                        DEBUG_LOCK_VERSION,
 560                        list_type, lock->ml.type, lock->ml.convert_type,
 561                        lock->ml.node,
 562                        dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
 563                        dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 564                        !list_empty(&lock->ast_list),
 565                        !list_empty(&lock->bast_list),
 566                        lock->ast_pending, lock->bast_pending,
 567                        lock->convert_pending, lock->lock_pending,
 568                        lock->cancel_pending, lock->unlock_pending,
 569                        atomic_read(&lock->lock_refs.refcount));
 570         spin_unlock(&lock->spinlock);
 571
 572         return out;
 573 }
 574
 575 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
 576 {
 577         struct dlm_lock *lock;
 578         int i;
 579         int out = 0;
 580
 581         out += snprintf(buf + out, len - out, "NAME:");
 582         out += stringify_lockname(res->lockname.name, res->lockname.len,
 583                                   buf + out, len - out);
 584         out += snprintf(buf + out, len - out, "\n");
 585
 586 #define DEBUG_LRES_VERSION      1
 587         out += snprintf(buf + out, len - out,
 588                         "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
 589                         DEBUG_LRES_VERSION,
 590                         res->owner, res->state, res->last_used,
 591                         !list_empty(&res->purge),
 592                         !list_empty(&res->dirty),
 593                         !list_empty(&res->recovering),
 594                         res->inflight_locks, res->migration_pending,
 595                         atomic_read(&res->asts_reserved),
 596                         atomic_read(&res->refs.refcount));
 597
 598         /* refmap */
 599         out += snprintf(buf + out, len - out, "RMAP:");
 600         out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
 601                                  buf + out, len - out);
 602         out += snprintf(buf + out, len - out, "\n");
 603
 604         /* lvb */
 605         out += snprintf(buf + out, len - out, "LVBX:");
 606         for (i = 0; i < DLM_LVB_LEN; i++)
 607                 out += snprintf(buf + out, len - out,
 608                                         "%02x", (unsigned char)res->lvb[i]);
 609         out += snprintf(buf + out, len - out, "\n");
 610
 611         /* granted */
 612         list_for_each_entry(lock, &res->granted, list)
 613                 out += dump_lock(lock, 0, buf + out, len - out);
 614
 615         /* converting */
 616         list_for_each_entry(lock, &res->converting, list)
 617                 out += dump_lock(lock, 1, buf + out, len - out);
 618
 619         /* blocked */
 620         list_for_each_entry(lock, &res->blocked, list)
 621                 out += dump_lock(lock, 2, buf + out, len - out);
 622
 623         out += snprintf(buf + out, len - out, "\n");
 624
 625         return out;
 626 }
 627
 628 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
 629 {
 630         struct debug_lockres *dl = m->private;
 631         struct dlm_ctxt *dlm = dl->dl_ctxt;
 632         struct dlm_lock_resource *oldres = dl->dl_res;
 633         struct dlm_lock_resource *res = NULL;
 634         struct list_head *track_list;
 635
 636         spin_lock(&dlm->track_lock);
 637         if (oldres)
 638                 track_list = &oldres->tracking;
 639         else
 640                 track_list = &dlm->tracking_list;
 641
 642         list_for_each_entry(res, track_list, tracking) {
 643                 if (&res->tracking == &dlm->tracking_list)
 644                         res = NULL;
 645                 else
 646                         dlm_lockres_get(res);
 647                 break;
 648         }
 649         spin_unlock(&dlm->track_lock);
 650
 651         if (oldres)
 652                 dlm_lockres_put(oldres);
 653
 654         dl->dl_res = res;
 655
 656         if (res) {
 657                 spin_lock(&res->spinlock);
 658                 dump_lockres(res, dl->dl_buf, dl->dl_len - 1);
 659                 spin_unlock(&res->spinlock);
 660         } else
 661                 dl = NULL;
 662
 663         /* passed to seq_show */
 664         return dl;
 665 }
 666
 667 static void lockres_seq_stop(struct seq_file *m, void *v)
 668 {
 669 }
 670
 671 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
 672 {
 673         return NULL;
 674 }
 675
 676 static int lockres_seq_show(struct seq_file *s, void *v)
 677 {
 678         struct debug_lockres *dl = (struct debug_lockres *)v;
 679
 680         seq_printf(s, "%s", dl->dl_buf);
 681
 682         return 0;
 683 }
 684
 685 static const struct seq_operations debug_lockres_ops = {
 686         .start =        lockres_seq_start,
 687         .stop =         lockres_seq_stop,
 688         .next =         lockres_seq_next,
 689         .show =         lockres_seq_show,
 690 };
 691
 692 static int debug_lockres_open(struct inode *inode, struct file *file)
 693 {
 694         struct dlm_ctxt *dlm = inode->i_private;
 695         int ret = -ENOMEM;
 696         struct seq_file *seq;
 697         struct debug_lockres *dl = NULL;
 698
 699         dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
 700         if (!dl) {
 701                 mlog_errno(ret);
 702                 goto bail;
 703         }
 704
 705         dl->dl_len = PAGE_SIZE;
 706         dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
 707         if (!dl->dl_buf) {
 708                 mlog_errno(ret);
 709                 goto bail;
 710         }
 711
 712         ret = seq_open(file, &debug_lockres_ops);
 713         if (ret) {
 714                 mlog_errno(ret);
 715                 goto bail;
 716         }
 717
 718         seq = (struct seq_file *) file->private_data;
 719         seq->private = dl;
 720
 721         dlm_grab(dlm);
 722         dl->dl_ctxt = dlm;
 723
 724         return 0;
 725 bail:
 726         if (dl)
 727                 kfree(dl->dl_buf);
 728         kfree(dl);
 729         return ret;
 730 }
 731
 732 static int debug_lockres_release(struct inode *inode, struct file *file)
 733 {
 734         struct seq_file *seq = (struct seq_file *)file->private_data;
 735         struct debug_lockres *dl = (struct debug_lockres *)seq->private;
 736
 737         if (dl->dl_res)
 738                 dlm_lockres_put(dl->dl_res);
 739         dlm_put(dl->dl_ctxt);
 740         kfree(dl->dl_buf);
 741         return seq_release_private(inode, file);
 742 }
 743
 744 static const struct file_operations debug_lockres_fops = {
 745         .open =         debug_lockres_open,
 746         .release =      debug_lockres_release,
 747         .read =         seq_read,
 748         .llseek =       seq_lseek,
 749 };
 750 /* end - debug lockres funcs */
 751
 752 /* begin - debug state funcs */
 753 static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 754 {
 755         int out = 0;
 756         struct dlm_reco_node_data *node;
 757         char *state;
 758         int cur_mles = 0, tot_mles = 0;
 759         int i;
 760
 761         spin_lock(&dlm->spinlock);
 762
 763         switch (dlm->dlm_state) {
 764         case DLM_CTXT_NEW:
 765                 state = "NEW"; break;
 766         case DLM_CTXT_JOINED:
 767                 state = "JOINED"; break;
 768         case DLM_CTXT_IN_SHUTDOWN:
 769                 state = "SHUTDOWN"; break;
 770         case DLM_CTXT_LEAVING:
 771                 state = "LEAVING"; break;
 772         default:
 773                 state = "UNKNOWN"; break;
 774         }
 775
 776         /* Domain: xxxxxxxxxx  Key: 0xdfbac769 */
 777         out += snprintf(db->buf + out, db->len - out,
 778                         "Domain: %s  Key: 0x%08x\n", dlm->name, dlm->key);
 779
 780         /* Thread Pid: xxx  Node: xxx  State: xxxxx */
 781         out += snprintf(db->buf + out, db->len - out,
 782                         "Thread Pid: %d  Node: %d  State: %s\n",
 783                         dlm->dlm_thread_task->pid, dlm->node_num, state);
 784
 785         /* Number of Joins: xxx  Joining Node: xxx */
 786         out += snprintf(db->buf + out, db->len - out,
 787                         "Number of Joins: %d  Joining Node: %d\n",
 788                         dlm->num_joins, dlm->joining_node);
 789
 790         /* Domain Map: xx xx xx */
 791         out += snprintf(db->buf + out, db->len - out, "Domain Map: ");
 792         out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
 793                                  db->buf + out, db->len - out);
 794         out += snprintf(db->buf + out, db->len - out, "\n");
 795
 796         /* Live Map: xx xx xx */
 797         out += snprintf(db->buf + out, db->len - out, "Live Map: ");
 798         out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
 799                                  db->buf + out, db->len - out);
 800         out += snprintf(db->buf + out, db->len - out, "\n");
 801
 802         /* Lock Resources: xxx (xxx) */
 803         out += snprintf(db->buf + out, db->len - out,
 804                         "Lock Resources: %d (%d)\n",
 805                         atomic_read(&dlm->res_cur_count),
 806                         atomic_read(&dlm->res_tot_count));
 807
 808         for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
 809                 tot_mles += atomic_read(&dlm->mle_tot_count[i]);
 810
 811         for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
 812                 cur_mles += atomic_read(&dlm->mle_cur_count[i]);
 813
 814         /* MLEs: xxx (xxx) */
 815         out += snprintf(db->buf + out, db->len - out,
 816                         "MLEs: %d (%d)\n", cur_mles, tot_mles);
 817
 818         /*  Blocking: xxx (xxx) */
 819         out += snprintf(db->buf + out, db->len - out,
 820                         "  Blocking: %d (%d)\n",
 821                         atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
 822                         atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
 823
 824         /*  Mastery: xxx (xxx) */
 825         out += snprintf(db->buf + out, db->len - out,
 826                         "  Mastery: %d (%d)\n",
 827                         atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
 828                         atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
 829
 830         /*  Migration: xxx (xxx) */
 831         out += snprintf(db->buf + out, db->len - out,
 832                         "  Migration: %d (%d)\n",
 833                         atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
 834                         atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
 835
 836         /* Lists: Dirty=Empty  Purge=InUse  PendingASTs=Empty  ... */
 837         out += snprintf(db->buf + out, db->len - out,
 838                         "Lists: Dirty=%s  Purge=%s  PendingASTs=%s  "
 839                         "PendingBASTs=%s\n",
 840                         (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
 841                         (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
 842                         (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
 843                         (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
 844
 845         /* Purge Count: xxx  Refs: xxx */
 846         out += snprintf(db->buf + out, db->len - out,
 847                         "Purge Count: %d  Refs: %d\n", dlm->purge_count,
 848                         atomic_read(&dlm->dlm_refs.refcount));
 849
 850         /* Dead Node: xxx */
 851         out += snprintf(db->buf + out, db->len - out,
 852                         "Dead Node: %d\n", dlm->reco.dead_node);
 853
 854         /* What about DLM_RECO_STATE_FINALIZE? */
 855         if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
 856                 state = "ACTIVE";
 857         else
 858                 state = "INACTIVE";
 859
 860         /* Recovery Pid: xxxx  Master: xxx  State: xxxx */
 861         out += snprintf(db->buf + out, db->len - out,
 862                         "Recovery Pid: %d  Master: %d  State: %s\n",
 863                         dlm->dlm_reco_thread_task->pid,
 864                         dlm->reco.new_master, state);
 865
 866         /* Recovery Map: xx xx */
 867         out += snprintf(db->buf + out, db->len - out, "Recovery Map: ");
 868         out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
 869                                  db->buf + out, db->len - out);
 870         out += snprintf(db->buf + out, db->len - out, "\n");
 871
 872         /* Recovery Node State: */
 873         out += snprintf(db->buf + out, db->len - out, "Recovery Node State:\n");
 874         list_for_each_entry(node, &dlm->reco.node_data, list) {
 875                 switch (node->state) {
 876                 case DLM_RECO_NODE_DATA_INIT:
 877                         state = "INIT";
 878                         break;
 879                 case DLM_RECO_NODE_DATA_REQUESTING:
 880                         state = "REQUESTING";
 881                         break;
 882                 case DLM_RECO_NODE_DATA_DEAD:
 883                         state = "DEAD";
 884                         break;
 885                 case DLM_RECO_NODE_DATA_RECEIVING:
 886                         state = "RECEIVING";
 887                         break;
 888                 case DLM_RECO_NODE_DATA_REQUESTED:
 889                         state = "REQUESTED";
 890                         break;
 891                 case DLM_RECO_NODE_DATA_DONE:
 892                         state = "DONE";
 893                         break;
 894                 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
 895                         state = "FINALIZE-SENT";
 896                         break;
 897                 default:
 898                         state = "BAD";
 899                         break;
 900                 }
 901                 out += snprintf(db->buf + out, db->len - out, "\t%u - %s\n",
 902                                 node->node_num, state);
 903         }
 904
 905         spin_unlock(&dlm->spinlock);
 906
 907         return out;
 908 }
 909
 910 static int debug_state_open(struct inode *inode, struct file *file)
 911 {
 912         struct dlm_ctxt *dlm = inode->i_private;
 913         struct debug_buffer *db = NULL;
 914
 915         db = debug_buffer_allocate();
 916         if (!db)
 917                 goto bail;
 918
 919         db->len = debug_state_print(dlm, db);
 920
 921         file->private_data = db;
 922
 923         return 0;
 924 bail:
 925         return -ENOMEM;
 926 }
 927
 928 static const struct file_operations debug_state_fops = {
 929         .open =         debug_state_open,
 930         .release =      debug_buffer_release,
 931         .read =         debug_buffer_read,
 932         .llseek =       debug_buffer_llseek,
 933 };
 934 /* end  - debug state funcs */
 935
 936 /* files in subroot */
 937 int dlm_debug_init(struct dlm_ctxt *dlm)
 938 {
 939         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
 940
 941         /* for dumping dlm_ctxt */
 942         dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
 943                                                      S_IFREG|S_IRUSR,
 944                                                      dlm->dlm_debugfs_subroot,
 945                                                      dlm, &debug_state_fops);
 946         if (!dc->debug_state_dentry) {
 947                 mlog_errno(-ENOMEM);
 948                 goto bail;
 949         }
 950
 951         /* for dumping lockres */
 952         dc->debug_lockres_dentry =
 953                         debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
 954                                             S_IFREG|S_IRUSR,
 955                                             dlm->dlm_debugfs_subroot,
 956                                             dlm, &debug_lockres_fops);
 957         if (!dc->debug_lockres_dentry) {
 958                 mlog_errno(-ENOMEM);
 959                 goto bail;
 960         }
 961
 962         /* for dumping mles */
 963         dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
 964                                                    S_IFREG|S_IRUSR,
 965                                                    dlm->dlm_debugfs_subroot,
 966                                                    dlm, &debug_mle_fops);
 967         if (!dc->debug_mle_dentry) {
 968                 mlog_errno(-ENOMEM);
 969                 goto bail;
 970         }
 971
 972         /* for dumping lockres on the purge list */
 973         dc->debug_purgelist_dentry =
 974                         debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
 975                                             S_IFREG|S_IRUSR,
 976                                             dlm->dlm_debugfs_subroot,
 977                                             dlm, &debug_purgelist_fops);
 978         if (!dc->debug_purgelist_dentry) {
 979                 mlog_errno(-ENOMEM);
 980                 goto bail;
 981         }
 982
 983         dlm_debug_get(dc);
 984         return 0;
 985
 986 bail:
 987         dlm_debug_shutdown(dlm);
 988         return -ENOMEM;
 989 }
 990
 991 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
 992 {
 993         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
 994
 995         if (dc) {
 996                 if (dc->debug_purgelist_dentry)
 997                         debugfs_remove(dc->debug_purgelist_dentry);
 998                 if (dc->debug_mle_dentry)
 999                         debugfs_remove(dc->debug_mle_dentry);
1000                 if (dc->debug_lockres_dentry)
1001                         debugfs_remove(dc->debug_lockres_dentry);
1002                 if (dc->debug_state_dentry)
1003                         debugfs_remove(dc->debug_state_dentry);
1004                 dlm_debug_put(dc);
1005         }
1006 }
1007
1008 /* subroot - domain dir */
1009 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
1010 {
1011         dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
1012                                                       dlm_debugfs_root);
1013         if (!dlm->dlm_debugfs_subroot) {
1014                 mlog_errno(-ENOMEM);
1015                 goto bail;
1016         }
1017
1018         dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
1019                                       GFP_KERNEL);
1020         if (!dlm->dlm_debug_ctxt) {
1021                 mlog_errno(-ENOMEM);
1022                 goto bail;
1023         }
1024         kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
1025
1026         return 0;
1027 bail:
1028         dlm_destroy_debugfs_subroot(dlm);
1029         return -ENOMEM;
1030 }
1031
1032 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
1033 {
1034         if (dlm->dlm_debugfs_subroot)
1035                 debugfs_remove(dlm->dlm_debugfs_subroot);
1036 }
1037
1038 /* debugfs root */
1039 int dlm_create_debugfs_root(void)
1040 {
1041         dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
1042         if (!dlm_debugfs_root) {
1043                 mlog_errno(-ENOMEM);
1044                 return -ENOMEM;
1045         }
1046         return 0;
1047 }
1048
1049 void dlm_destroy_debugfs_root(void)
1050 {
1051         if (dlm_debugfs_root)
1052                 debugfs_remove(dlm_debugfs_root);
1053 }
1054 #endif  /* CONFIG_DEBUG_FS */