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 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 void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
  48 {
  49         mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
  50                res->lockname.len, res->lockname.name,
  51                res->owner, res->state);
  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         mlog(ML_NOTICE, "  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 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
  75 {
  76         struct list_head *iter2;
  77         struct dlm_lock *lock;
  78
  79         assert_spin_locked(&res->spinlock);
  80
  81         mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
  82                res->lockname.len, res->lockname.name,
  83                res->owner, res->state);
  84         mlog(ML_NOTICE, "  last used: %lu, on purge list: %s\n",
  85              res->last_used, list_empty(&res->purge) ? "no" : "yes");
  86         dlm_print_lockres_refmap(res);
  87         mlog(ML_NOTICE, "  granted queue: \n");
  88         list_for_each(iter2, &res->granted) {
  89                 lock = list_entry(iter2, struct dlm_lock, list);
  90                 spin_lock(&lock->spinlock);
  91                 mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
  92                        "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
  93                        lock->ml.type, lock->ml.convert_type, lock->ml.node,
  94                      dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
  95                      dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
  96                        list_empty(&lock->ast_list) ? 'y' : 'n',
  97                        lock->ast_pending ? 'y' : 'n',
  98                        list_empty(&lock->bast_list) ? 'y' : 'n',
  99                        lock->bast_pending ? 'y' : 'n');
 100                 spin_unlock(&lock->spinlock);
 101         }
 102         mlog(ML_NOTICE, "  converting queue: \n");
 103         list_for_each(iter2, &res->converting) {
 104                 lock = list_entry(iter2, struct dlm_lock, list);
 105                 spin_lock(&lock->spinlock);
 106                 mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
 107                        "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
 108                        lock->ml.type, lock->ml.convert_type, lock->ml.node,
 109                      dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
 110                      dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 111                        list_empty(&lock->ast_list) ? 'y' : 'n',
 112                        lock->ast_pending ? 'y' : 'n',
 113                        list_empty(&lock->bast_list) ? 'y' : 'n',
 114                        lock->bast_pending ? 'y' : 'n');
 115                 spin_unlock(&lock->spinlock);
 116         }
 117         mlog(ML_NOTICE, "  blocked queue: \n");
 118         list_for_each(iter2, &res->blocked) {
 119                 lock = list_entry(iter2, struct dlm_lock, list);
 120                 spin_lock(&lock->spinlock);
 121                 mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
 122                        "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
 123                        lock->ml.type, lock->ml.convert_type, lock->ml.node,
 124                      dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
 125                      dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 126                        list_empty(&lock->ast_list) ? 'y' : 'n',
 127                        lock->ast_pending ? 'y' : 'n',
 128                        list_empty(&lock->bast_list) ? 'y' : 'n',
 129                        lock->bast_pending ? 'y' : 'n');
 130                 spin_unlock(&lock->spinlock);
 131         }
 132 }
 133
 134 void dlm_print_one_lock(struct dlm_lock *lockid)
 135 {
 136         dlm_print_one_lock_resource(lockid->lockres);
 137 }
 138 EXPORT_SYMBOL_GPL(dlm_print_one_lock);
 139
 140 #if 0
 141 void dlm_dump_lock_resources(struct dlm_ctxt *dlm)
 142 {
 143         struct dlm_lock_resource *res;
 144         struct hlist_node *iter;
 145         struct hlist_head *bucket;
 146         int i;
 147
 148         mlog(ML_NOTICE, "struct dlm_ctxt: %s, node=%u, key=%u\n",
 149                   dlm->name, dlm->node_num, dlm->key);
 150         if (!dlm || !dlm->name) {
 151                 mlog(ML_ERROR, "dlm=%p\n", dlm);
 152                 return;
 153         }
 154
 155         spin_lock(&dlm->spinlock);
 156         for (i=0; i<DLM_HASH_BUCKETS; i++) {
 157                 bucket = dlm_lockres_hash(dlm, i);
 158                 hlist_for_each_entry(res, iter, bucket, hash_node)
 159                         dlm_print_one_lock_resource(res);
 160         }
 161         spin_unlock(&dlm->spinlock);
 162 }
 163 #endif  /*  0  */
 164
 165 static const char *dlm_errnames[] = {
 166         [DLM_NORMAL] =                  "DLM_NORMAL",
 167         [DLM_GRANTED] =                 "DLM_GRANTED",
 168         [DLM_DENIED] =                  "DLM_DENIED",
 169         [DLM_DENIED_NOLOCKS] =          "DLM_DENIED_NOLOCKS",
 170         [DLM_WORKING] =                 "DLM_WORKING",
 171         [DLM_BLOCKED] =                 "DLM_BLOCKED",
 172         [DLM_BLOCKED_ORPHAN] =          "DLM_BLOCKED_ORPHAN",
 173         [DLM_DENIED_GRACE_PERIOD] =     "DLM_DENIED_GRACE_PERIOD",
 174         [DLM_SYSERR] =                  "DLM_SYSERR",
 175         [DLM_NOSUPPORT] =               "DLM_NOSUPPORT",
 176         [DLM_CANCELGRANT] =             "DLM_CANCELGRANT",
 177         [DLM_IVLOCKID] =                "DLM_IVLOCKID",
 178         [DLM_SYNC] =                    "DLM_SYNC",
 179         [DLM_BADTYPE] =                 "DLM_BADTYPE",
 180         [DLM_BADRESOURCE] =             "DLM_BADRESOURCE",
 181         [DLM_MAXHANDLES] =              "DLM_MAXHANDLES",
 182         [DLM_NOCLINFO] =                "DLM_NOCLINFO",
 183         [DLM_NOLOCKMGR] =               "DLM_NOLOCKMGR",
 184         [DLM_NOPURGED] =                "DLM_NOPURGED",
 185         [DLM_BADARGS] =                 "DLM_BADARGS",
 186         [DLM_VOID] =                    "DLM_VOID",
 187         [DLM_NOTQUEUED] =               "DLM_NOTQUEUED",
 188         [DLM_IVBUFLEN] =                "DLM_IVBUFLEN",
 189         [DLM_CVTUNGRANT] =              "DLM_CVTUNGRANT",
 190         [DLM_BADPARAM] =                "DLM_BADPARAM",
 191         [DLM_VALNOTVALID] =             "DLM_VALNOTVALID",
 192         [DLM_REJECTED] =                "DLM_REJECTED",
 193         [DLM_ABORT] =                   "DLM_ABORT",
 194         [DLM_CANCEL] =                  "DLM_CANCEL",
 195         [DLM_IVRESHANDLE] =             "DLM_IVRESHANDLE",
 196         [DLM_DEADLOCK] =                "DLM_DEADLOCK",
 197         [DLM_DENIED_NOASTS] =           "DLM_DENIED_NOASTS",
 198         [DLM_FORWARD] =                 "DLM_FORWARD",
 199         [DLM_TIMEOUT] =                 "DLM_TIMEOUT",
 200         [DLM_IVGROUPID] =               "DLM_IVGROUPID",
 201         [DLM_VERS_CONFLICT] =           "DLM_VERS_CONFLICT",
 202         [DLM_BAD_DEVICE_PATH] =         "DLM_BAD_DEVICE_PATH",
 203         [DLM_NO_DEVICE_PERMISSION] =    "DLM_NO_DEVICE_PERMISSION",
 204         [DLM_NO_CONTROL_DEVICE ] =      "DLM_NO_CONTROL_DEVICE ",
 205         [DLM_RECOVERING] =              "DLM_RECOVERING",
 206         [DLM_MIGRATING] =               "DLM_MIGRATING",
 207         [DLM_MAXSTATS] =                "DLM_MAXSTATS",
 208 };
 209
 210 static const char *dlm_errmsgs[] = {
 211         [DLM_NORMAL] =                  "request in progress",
 212         [DLM_GRANTED] =                 "request granted",
 213         [DLM_DENIED] =                  "request denied",
 214         [DLM_DENIED_NOLOCKS] =          "request denied, out of system resources",
 215         [DLM_WORKING] =                 "async request in progress",
 216         [DLM_BLOCKED] =                 "lock request blocked",
 217         [DLM_BLOCKED_ORPHAN] =          "lock request blocked by a orphan lock",
 218         [DLM_DENIED_GRACE_PERIOD] =     "topological change in progress",
 219         [DLM_SYSERR] =                  "system error",
 220         [DLM_NOSUPPORT] =               "unsupported",
 221         [DLM_CANCELGRANT] =             "can't cancel convert: already granted",
 222         [DLM_IVLOCKID] =                "bad lockid",
 223         [DLM_SYNC] =                    "synchronous request granted",
 224         [DLM_BADTYPE] =                 "bad resource type",
 225         [DLM_BADRESOURCE] =             "bad resource handle",
 226         [DLM_MAXHANDLES] =              "no more resource handles",
 227         [DLM_NOCLINFO] =                "can't contact cluster manager",
 228         [DLM_NOLOCKMGR] =               "can't contact lock manager",
 229         [DLM_NOPURGED] =                "can't contact purge daemon",
 230         [DLM_BADARGS] =                 "bad api args",
 231         [DLM_VOID] =                    "no status",
 232         [DLM_NOTQUEUED] =               "NOQUEUE was specified and request failed",
 233         [DLM_IVBUFLEN] =                "invalid resource name length",
 234         [DLM_CVTUNGRANT] =              "attempted to convert ungranted lock",
 235         [DLM_BADPARAM] =                "invalid lock mode specified",
 236         [DLM_VALNOTVALID] =             "value block has been invalidated",
 237         [DLM_REJECTED] =                "request rejected, unrecognized client",
 238         [DLM_ABORT] =                   "blocked lock request cancelled",
 239         [DLM_CANCEL] =                  "conversion request cancelled",
 240         [DLM_IVRESHANDLE] =             "invalid resource handle",
 241         [DLM_DEADLOCK] =                "deadlock recovery refused this request",
 242         [DLM_DENIED_NOASTS] =           "failed to allocate AST",
 243         [DLM_FORWARD] =                 "request must wait for primary's response",
 244         [DLM_TIMEOUT] =                 "timeout value for lock has expired",
 245         [DLM_IVGROUPID] =               "invalid group specification",
 246         [DLM_VERS_CONFLICT] =           "version conflicts prevent request handling",
 247         [DLM_BAD_DEVICE_PATH] =         "Locks device does not exist or path wrong",
 248         [DLM_NO_DEVICE_PERMISSION] =    "Client has insufficient perms for device",
 249         [DLM_NO_CONTROL_DEVICE] =       "Cannot set options on opened device ",
 250         [DLM_RECOVERING] =              "lock resource being recovered",
 251         [DLM_MIGRATING] =               "lock resource being migrated",
 252         [DLM_MAXSTATS] =                "invalid error number",
 253 };
 254
 255 const char *dlm_errmsg(enum dlm_status err)
 256 {
 257         if (err >= DLM_MAXSTATS || err < 0)
 258                 return dlm_errmsgs[DLM_MAXSTATS];
 259         return dlm_errmsgs[err];
 260 }
 261 EXPORT_SYMBOL_GPL(dlm_errmsg);
 262
 263 const char *dlm_errname(enum dlm_status err)
 264 {
 265         if (err >= DLM_MAXSTATS || err < 0)
 266                 return dlm_errnames[DLM_MAXSTATS];
 267         return dlm_errnames[err];
 268 }
 269 EXPORT_SYMBOL_GPL(dlm_errname);
 270
 271
 272 #ifdef CONFIG_DEBUG_FS
 273
 274 static struct dentry *dlm_debugfs_root = NULL;
 275
 276 #define DLM_DEBUGFS_DIR                         "o2dlm"
 277 #define DLM_DEBUGFS_DLM_STATE                   "dlm_state"
 278
 279 /* begin - utils funcs */
 280 static void dlm_debug_free(struct kref *kref)
 281 {
 282         struct dlm_debug_ctxt *dc;
 283
 284         dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
 285
 286         kfree(dc);
 287 }
 288
 289 void dlm_debug_put(struct dlm_debug_ctxt *dc)
 290 {
 291         if (dc)
 292                 kref_put(&dc->debug_refcnt, dlm_debug_free);
 293 }
 294
 295 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
 296 {
 297         kref_get(&dc->debug_refcnt);
 298 }
 299
 300 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
 301                              char *buf, int len)
 302 {
 303         int out = 0;
 304         int i = -1;
 305
 306         while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
 307                 out += snprintf(buf + out, len - out, "%d ", i);
 308
 309         return out;
 310 }
 311
 312 static struct debug_buffer *debug_buffer_allocate(void)
 313 {
 314         struct debug_buffer *db = NULL;
 315
 316         db = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
 317         if (!db)
 318                 goto bail;
 319
 320         db->len = PAGE_SIZE;
 321         db->buf = kmalloc(db->len, GFP_KERNEL);
 322         if (!db->buf)
 323                 goto bail;
 324
 325         return db;
 326 bail:
 327         kfree(db);
 328         return NULL;
 329 }
 330
 331 static ssize_t debug_buffer_read(struct file *file, char __user *buf,
 332                                  size_t nbytes, loff_t *ppos)
 333 {
 334         struct debug_buffer *db = file->private_data;
 335
 336         return simple_read_from_buffer(buf, nbytes, ppos, db->buf, db->len);
 337 }
 338
 339 static loff_t debug_buffer_llseek(struct file *file, loff_t off, int whence)
 340 {
 341         struct debug_buffer *db = file->private_data;
 342         loff_t new = -1;
 343
 344         switch (whence) {
 345         case 0:
 346                 new = off;
 347                 break;
 348         case 1:
 349                 new = file->f_pos + off;
 350                 break;
 351         }
 352
 353         if (new < 0 || new > db->len)
 354                 return -EINVAL;
 355
 356         return (file->f_pos = new);
 357 }
 358
 359 static int debug_buffer_release(struct inode *inode, struct file *file)
 360 {
 361         struct debug_buffer *db = (struct debug_buffer *)file->private_data;
 362
 363         if (db)
 364                 kfree(db->buf);
 365         kfree(db);
 366
 367         return 0;
 368 }
 369 /* end - util funcs */
 370
 371 /* begin - debug state funcs */
 372 static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 373 {
 374         int out = 0;
 375         struct dlm_reco_node_data *node;
 376         char *state;
 377         int lres, rres, ures, tres;
 378
 379         lres = atomic_read(&dlm->local_resources);
 380         rres = atomic_read(&dlm->remote_resources);
 381         ures = atomic_read(&dlm->unknown_resources);
 382         tres = lres + rres + ures;
 383
 384         spin_lock(&dlm->spinlock);
 385
 386         switch (dlm->dlm_state) {
 387         case DLM_CTXT_NEW:
 388                 state = "NEW"; break;
 389         case DLM_CTXT_JOINED:
 390                 state = "JOINED"; break;
 391         case DLM_CTXT_IN_SHUTDOWN:
 392                 state = "SHUTDOWN"; break;
 393         case DLM_CTXT_LEAVING:
 394                 state = "LEAVING"; break;
 395         default:
 396                 state = "UNKNOWN"; break;
 397         }
 398
 399         /* Domain: xxxxxxxxxx  Key: 0xdfbac769 */
 400         out += snprintf(db->buf + out, db->len - out,
 401                         "Domain: %s  Key: 0x%08x\n", dlm->name, dlm->key);
 402
 403         /* Thread Pid: xxx  Node: xxx  State: xxxxx */
 404         out += snprintf(db->buf + out, db->len - out,
 405                         "Thread Pid: %d  Node: %d  State: %s\n",
 406                         dlm->dlm_thread_task->pid, dlm->node_num, state);
 407
 408         /* Number of Joins: xxx  Joining Node: xxx */
 409         out += snprintf(db->buf + out, db->len - out,
 410                         "Number of Joins: %d  Joining Node: %d\n",
 411                         dlm->num_joins, dlm->joining_node);
 412
 413         /* Domain Map: xx xx xx */
 414         out += snprintf(db->buf + out, db->len - out, "Domain Map: ");
 415         out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
 416                                  db->buf + out, db->len - out);
 417         out += snprintf(db->buf + out, db->len - out, "\n");
 418
 419         /* Live Map: xx xx xx */
 420         out += snprintf(db->buf + out, db->len - out, "Live Map: ");
 421         out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
 422                                  db->buf + out, db->len - out);
 423         out += snprintf(db->buf + out, db->len - out, "\n");
 424
 425         /* Mastered Resources Total: xxx  Locally: xxx  Remotely: ... */
 426         out += snprintf(db->buf + out, db->len - out,
 427                         "Mastered Resources Total: %d  Locally: %d  "
 428                         "Remotely: %d  Unknown: %d\n",
 429                         tres, lres, rres, ures);
 430
 431         /* Lists: Dirty=Empty  Purge=InUse  PendingASTs=Empty  ... */
 432         out += snprintf(db->buf + out, db->len - out,
 433                         "Lists: Dirty=%s  Purge=%s  PendingASTs=%s  "
 434                         "PendingBASTs=%s  Master=%s\n",
 435                         (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
 436                         (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
 437                         (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
 438                         (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"),
 439                         (list_empty(&dlm->master_list) ? "Empty" : "InUse"));
 440
 441         /* Purge Count: xxx  Refs: xxx */
 442         out += snprintf(db->buf + out, db->len - out,
 443                         "Purge Count: %d  Refs: %d\n", dlm->purge_count,
 444                         atomic_read(&dlm->dlm_refs.refcount));
 445
 446         /* Dead Node: xxx */
 447         out += snprintf(db->buf + out, db->len - out,
 448                         "Dead Node: %d\n", dlm->reco.dead_node);
 449
 450         /* What about DLM_RECO_STATE_FINALIZE? */
 451         if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
 452                 state = "ACTIVE";
 453         else
 454                 state = "INACTIVE";
 455
 456         /* Recovery Pid: xxxx  Master: xxx  State: xxxx */
 457         out += snprintf(db->buf + out, db->len - out,
 458                         "Recovery Pid: %d  Master: %d  State: %s\n",
 459                         dlm->dlm_reco_thread_task->pid,
 460                         dlm->reco.new_master, state);
 461
 462         /* Recovery Map: xx xx */
 463         out += snprintf(db->buf + out, db->len - out, "Recovery Map: ");
 464         out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
 465                                  db->buf + out, db->len - out);
 466         out += snprintf(db->buf + out, db->len - out, "\n");
 467
 468         /* Recovery Node State: */
 469         out += snprintf(db->buf + out, db->len - out, "Recovery Node State:\n");
 470         list_for_each_entry(node, &dlm->reco.node_data, list) {
 471                 switch (node->state) {
 472                 case DLM_RECO_NODE_DATA_INIT:
 473                         state = "INIT";
 474                         break;
 475                 case DLM_RECO_NODE_DATA_REQUESTING:
 476                         state = "REQUESTING";
 477                         break;
 478                 case DLM_RECO_NODE_DATA_DEAD:
 479                         state = "DEAD";
 480                         break;
 481                 case DLM_RECO_NODE_DATA_RECEIVING:
 482                         state = "RECEIVING";
 483                         break;
 484                 case DLM_RECO_NODE_DATA_REQUESTED:
 485                         state = "REQUESTED";
 486                         break;
 487                 case DLM_RECO_NODE_DATA_DONE:
 488                         state = "DONE";
 489                         break;
 490                 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
 491                         state = "FINALIZE-SENT";
 492                         break;
 493                 default:
 494                         state = "BAD";
 495                         break;
 496                 }
 497                 out += snprintf(db->buf + out, db->len - out, "\t%u - %s\n",
 498                                 node->node_num, state);
 499         }
 500
 501         spin_unlock(&dlm->spinlock);
 502
 503         return out;
 504 }
 505
 506 static int debug_state_open(struct inode *inode, struct file *file)
 507 {
 508         struct dlm_ctxt *dlm = inode->i_private;
 509         struct debug_buffer *db = NULL;
 510
 511         db = debug_buffer_allocate();
 512         if (!db)
 513                 goto bail;
 514
 515         db->len = debug_state_print(dlm, db);
 516
 517         file->private_data = db;
 518
 519         return 0;
 520 bail:
 521         return -ENOMEM;
 522 }
 523
 524 static struct file_operations debug_state_fops = {
 525         .open =         debug_state_open,
 526         .release =      debug_buffer_release,
 527         .read =         debug_buffer_read,
 528         .llseek =       debug_buffer_llseek,
 529 };
 530 /* end  - debug state funcs */
 531
 532 /* files in subroot */
 533 int dlm_debug_init(struct dlm_ctxt *dlm)
 534 {
 535         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
 536
 537         /* for dumping dlm_ctxt */
 538         dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
 539                                                      S_IFREG|S_IRUSR,
 540                                                      dlm->dlm_debugfs_subroot,
 541                                                      dlm, &debug_state_fops);
 542         if (!dc->debug_state_dentry) {
 543                 mlog_errno(-ENOMEM);
 544                 goto bail;
 545         }
 546
 547         dlm_debug_get(dc);
 548         return 0;
 549
 550 bail:
 551         dlm_debug_shutdown(dlm);
 552         return -ENOMEM;
 553 }
 554
 555 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
 556 {
 557         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
 558
 559         if (dc) {
 560                 if (dc->debug_state_dentry)
 561                         debugfs_remove(dc->debug_state_dentry);
 562                 dlm_debug_put(dc);
 563         }
 564 }
 565
 566 /* subroot - domain dir */
 567 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
 568 {
 569         dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
 570                                                       dlm_debugfs_root);
 571         if (!dlm->dlm_debugfs_subroot) {
 572                 mlog_errno(-ENOMEM);
 573                 goto bail;
 574         }
 575
 576         dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
 577                                       GFP_KERNEL);
 578         if (!dlm->dlm_debug_ctxt) {
 579                 mlog_errno(-ENOMEM);
 580                 goto bail;
 581         }
 582         kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
 583
 584         return 0;
 585 bail:
 586         dlm_destroy_debugfs_subroot(dlm);
 587         return -ENOMEM;
 588 }
 589
 590 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
 591 {
 592         if (dlm->dlm_debugfs_subroot)
 593                 debugfs_remove(dlm->dlm_debugfs_subroot);
 594 }
 595
 596 /* debugfs root */
 597 int dlm_create_debugfs_root(void)
 598 {
 599         dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
 600         if (!dlm_debugfs_root) {
 601                 mlog_errno(-ENOMEM);
 602                 return -ENOMEM;
 603         }
 604         return 0;
 605 }
 606
 607 void dlm_destroy_debugfs_root(void)
 608 {
 609         if (dlm_debugfs_root)
 610                 debugfs_remove(dlm_debugfs_root);
 611 }
 612 #endif  /* CONFIG_DEBUG_FS */