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 /* NOTE: This function converts a lockname into a string. It uses knowledge
 277  * of the format of the lockname that should be outside the purview of the dlm.
 278  * We are adding only to make dlm debugging slightly easier.
 279  *
 280  * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
 281  */
 282 static int stringify_lockname(const char *lockname, int locklen,
 283                               char *buf, int len)
 284 {
 285         int out = 0;
 286         __be64 inode_blkno_be;
 287
 288 #define OCFS2_DENTRY_LOCK_INO_START     18
 289         if (*lockname == 'N') {
 290                 memcpy((__be64 *)&inode_blkno_be,
 291                        (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
 292                        sizeof(__be64));
 293                 out += snprintf(buf + out, len - out, "%.*s%08x",
 294                                 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
 295                                 (unsigned int)be64_to_cpu(inode_blkno_be));
 296         } else
 297                 out += snprintf(buf + out, len - out, "%.*s",
 298                                 locklen, lockname);
 299         return out;
 300 }
 301
 302 #define DLM_DEBUGFS_DIR                         "o2dlm"
 303 #define DLM_DEBUGFS_DLM_STATE                   "dlm_state"
 304 #define DLM_DEBUGFS_LOCKING_STATE               "locking_state"
 305 #define DLM_DEBUGFS_MLE_STATE                   "mle_state"
 306
 307 /* begin - utils funcs */
 308 static void dlm_debug_free(struct kref *kref)
 309 {
 310         struct dlm_debug_ctxt *dc;
 311
 312         dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
 313
 314         kfree(dc);
 315 }
 316
 317 void dlm_debug_put(struct dlm_debug_ctxt *dc)
 318 {
 319         if (dc)
 320                 kref_put(&dc->debug_refcnt, dlm_debug_free);
 321 }
 322
 323 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
 324 {
 325         kref_get(&dc->debug_refcnt);
 326 }
 327
 328 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
 329                              char *buf, int len)
 330 {
 331         int out = 0;
 332         int i = -1;
 333
 334         while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
 335                 out += snprintf(buf + out, len - out, "%d ", i);
 336
 337         return out;
 338 }
 339
 340 static struct debug_buffer *debug_buffer_allocate(void)
 341 {
 342         struct debug_buffer *db = NULL;
 343
 344         db = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
 345         if (!db)
 346                 goto bail;
 347
 348         db->len = PAGE_SIZE;
 349         db->buf = kmalloc(db->len, GFP_KERNEL);
 350         if (!db->buf)
 351                 goto bail;
 352
 353         return db;
 354 bail:
 355         kfree(db);
 356         return NULL;
 357 }
 358
 359 static ssize_t debug_buffer_read(struct file *file, char __user *buf,
 360                                  size_t nbytes, loff_t *ppos)
 361 {
 362         struct debug_buffer *db = file->private_data;
 363
 364         return simple_read_from_buffer(buf, nbytes, ppos, db->buf, db->len);
 365 }
 366
 367 static loff_t debug_buffer_llseek(struct file *file, loff_t off, int whence)
 368 {
 369         struct debug_buffer *db = file->private_data;
 370         loff_t new = -1;
 371
 372         switch (whence) {
 373         case 0:
 374                 new = off;
 375                 break;
 376         case 1:
 377                 new = file->f_pos + off;
 378                 break;
 379         }
 380
 381         if (new < 0 || new > db->len)
 382                 return -EINVAL;
 383
 384         return (file->f_pos = new);
 385 }
 386
 387 static int debug_buffer_release(struct inode *inode, struct file *file)
 388 {
 389         struct debug_buffer *db = (struct debug_buffer *)file->private_data;
 390
 391         if (db)
 392                 kfree(db->buf);
 393         kfree(db);
 394
 395         return 0;
 396 }
 397 /* end - util funcs */
 398
 399 /* begin - debug mle funcs */
 400 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)
 401 {
 402         int out = 0;
 403         unsigned int namelen;
 404         const char *name;
 405         char *mle_type;
 406
 407         if (mle->type != DLM_MLE_MASTER) {
 408                 namelen = mle->u.name.len;
 409                 name = mle->u.name.name;
 410         } else {
 411                 namelen = mle->u.res->lockname.len;
 412                 name = mle->u.res->lockname.name;
 413         }
 414
 415         if (mle->type == DLM_MLE_BLOCK)
 416                 mle_type = "BLK";
 417         else if (mle->type == DLM_MLE_MASTER)
 418                 mle_type = "MAS";
 419         else
 420                 mle_type = "MIG";
 421
 422         out += stringify_lockname(name, namelen, buf + out, len - out);
 423         out += snprintf(buf + out, len - out,
 424                         "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",
 425                         mle_type, mle->master, mle->new_master,
 426                         !list_empty(&mle->hb_events),
 427                         !!mle->inuse,
 428                         atomic_read(&mle->mle_refs.refcount));
 429
 430         out += snprintf(buf + out, len - out, "Maybe=");
 431         out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,
 432                                  buf + out, len - out);
 433         out += snprintf(buf + out, len - out, "\n");
 434
 435         out += snprintf(buf + out, len - out, "Vote=");
 436         out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,
 437                                  buf + out, len - out);
 438         out += snprintf(buf + out, len - out, "\n");
 439
 440         out += snprintf(buf + out, len - out, "Response=");
 441         out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,
 442                                  buf + out, len - out);
 443         out += snprintf(buf + out, len - out, "\n");
 444
 445         out += snprintf(buf + out, len - out, "Node=");
 446         out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,
 447                                  buf + out, len - out);
 448         out += snprintf(buf + out, len - out, "\n");
 449
 450         out += snprintf(buf + out, len - out, "\n");
 451
 452         return out;
 453 }
 454
 455 static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 456 {
 457         struct dlm_master_list_entry *mle;
 458         int out = 0;
 459         unsigned long total = 0;
 460
 461         out += snprintf(db->buf + out, db->len - out,
 462                         "Dumping MLEs for Domain: %s\n", dlm->name);
 463
 464         spin_lock(&dlm->master_lock);
 465         list_for_each_entry(mle, &dlm->master_list, list) {
 466                 ++total;
 467                 if (db->len - out < 200)
 468                         continue;
 469                 out += dump_mle(mle, db->buf + out, db->len - out);
 470         }
 471         spin_unlock(&dlm->master_lock);
 472
 473         out += snprintf(db->buf + out, db->len - out,
 474                         "Total on list: %ld\n", total);
 475         return out;
 476 }
 477
 478 static int debug_mle_open(struct inode *inode, struct file *file)
 479 {
 480         struct dlm_ctxt *dlm = inode->i_private;
 481         struct debug_buffer *db;
 482
 483         db = debug_buffer_allocate();
 484         if (!db)
 485                 goto bail;
 486
 487         db->len = debug_mle_print(dlm, db);
 488
 489         file->private_data = db;
 490
 491         return 0;
 492 bail:
 493         return -ENOMEM;
 494 }
 495
 496 static struct file_operations debug_mle_fops = {
 497         .open =         debug_mle_open,
 498         .release =      debug_buffer_release,
 499         .read =         debug_buffer_read,
 500         .llseek =       debug_buffer_llseek,
 501 };
 502
 503 /* end - debug mle funcs */
 504
 505 /* begin - debug lockres funcs */
 506 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
 507 {
 508         int out;
 509
 510 #define DEBUG_LOCK_VERSION      1
 511         spin_lock(&lock->spinlock);
 512         out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
 513                        "%d,%d,%d,%d\n",
 514                        DEBUG_LOCK_VERSION,
 515                        list_type, lock->ml.type, lock->ml.convert_type,
 516                        lock->ml.node,
 517                        dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
 518                        dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 519                        !list_empty(&lock->ast_list),
 520                        !list_empty(&lock->bast_list),
 521                        lock->ast_pending, lock->bast_pending,
 522                        lock->convert_pending, lock->lock_pending,
 523                        lock->cancel_pending, lock->unlock_pending,
 524                        atomic_read(&lock->lock_refs.refcount));
 525         spin_unlock(&lock->spinlock);
 526
 527         return out;
 528 }
 529
 530 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
 531 {
 532         struct dlm_lock *lock;
 533         int i;
 534         int out = 0;
 535
 536         out += snprintf(buf + out, len - out, "NAME:");
 537         out += stringify_lockname(res->lockname.name, res->lockname.len,
 538                                   buf + out, len - out);
 539         out += snprintf(buf + out, len - out, "\n");
 540
 541 #define DEBUG_LRES_VERSION      1
 542         out += snprintf(buf + out, len - out,
 543                         "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
 544                         DEBUG_LRES_VERSION,
 545                         res->owner, res->state, res->last_used,
 546                         !list_empty(&res->purge),
 547                         !list_empty(&res->dirty),
 548                         !list_empty(&res->recovering),
 549                         res->inflight_locks, res->migration_pending,
 550                         atomic_read(&res->asts_reserved),
 551                         atomic_read(&res->refs.refcount));
 552
 553         /* refmap */
 554         out += snprintf(buf + out, len - out, "RMAP:");
 555         out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
 556                                  buf + out, len - out);
 557         out += snprintf(buf + out, len - out, "\n");
 558
 559         /* lvb */
 560         out += snprintf(buf + out, len - out, "LVBX:");
 561         for (i = 0; i < DLM_LVB_LEN; i++)
 562                 out += snprintf(buf + out, len - out,
 563                                         "%02x", (unsigned char)res->lvb[i]);
 564         out += snprintf(buf + out, len - out, "\n");
 565
 566         /* granted */
 567         list_for_each_entry(lock, &res->granted, list)
 568                 out += dump_lock(lock, 0, buf + out, len - out);
 569
 570         /* converting */
 571         list_for_each_entry(lock, &res->converting, list)
 572                 out += dump_lock(lock, 1, buf + out, len - out);
 573
 574         /* blocked */
 575         list_for_each_entry(lock, &res->blocked, list)
 576                 out += dump_lock(lock, 2, buf + out, len - out);
 577
 578         out += snprintf(buf + out, len - out, "\n");
 579
 580         return out;
 581 }
 582
 583 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
 584 {
 585         struct debug_lockres *dl = m->private;
 586         struct dlm_ctxt *dlm = dl->dl_ctxt;
 587         struct dlm_lock_resource *res = NULL;
 588
 589         spin_lock(&dlm->spinlock);
 590
 591         if (dl->dl_res) {
 592                 list_for_each_entry(res, &dl->dl_res->tracking, tracking) {
 593                         if (dl->dl_res) {
 594                                 dlm_lockres_put(dl->dl_res);
 595                                 dl->dl_res = NULL;
 596                         }
 597                         if (&res->tracking == &dlm->tracking_list) {
 598                                 mlog(0, "End of list found, %p\n", res);
 599                                 dl = NULL;
 600                                 break;
 601                         }
 602                         dlm_lockres_get(res);
 603                         dl->dl_res = res;
 604                         break;
 605                 }
 606         } else {
 607                 if (!list_empty(&dlm->tracking_list)) {
 608                         list_for_each_entry(res, &dlm->tracking_list, tracking)
 609                                 break;
 610                         dlm_lockres_get(res);
 611                         dl->dl_res = res;
 612                 } else
 613                         dl = NULL;
 614         }
 615
 616         if (dl) {
 617                 spin_lock(&dl->dl_res->spinlock);
 618                 dump_lockres(dl->dl_res, dl->dl_buf, dl->dl_len - 1);
 619                 spin_unlock(&dl->dl_res->spinlock);
 620         }
 621
 622         spin_unlock(&dlm->spinlock);
 623
 624         return dl;
 625 }
 626
 627 static void lockres_seq_stop(struct seq_file *m, void *v)
 628 {
 629 }
 630
 631 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
 632 {
 633         return NULL;
 634 }
 635
 636 static int lockres_seq_show(struct seq_file *s, void *v)
 637 {
 638         struct debug_lockres *dl = (struct debug_lockres *)v;
 639
 640         seq_printf(s, "%s", dl->dl_buf);
 641
 642         return 0;
 643 }
 644
 645 static struct seq_operations debug_lockres_ops = {
 646         .start =        lockres_seq_start,
 647         .stop =         lockres_seq_stop,
 648         .next =         lockres_seq_next,
 649         .show =         lockres_seq_show,
 650 };
 651
 652 static int debug_lockres_open(struct inode *inode, struct file *file)
 653 {
 654         struct dlm_ctxt *dlm = inode->i_private;
 655         int ret = -ENOMEM;
 656         struct seq_file *seq;
 657         struct debug_lockres *dl = NULL;
 658
 659         dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
 660         if (!dl) {
 661                 mlog_errno(ret);
 662                 goto bail;
 663         }
 664
 665         dl->dl_len = PAGE_SIZE;
 666         dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
 667         if (!dl->dl_buf) {
 668                 mlog_errno(ret);
 669                 goto bail;
 670         }
 671
 672         ret = seq_open(file, &debug_lockres_ops);
 673         if (ret) {
 674                 mlog_errno(ret);
 675                 goto bail;
 676         }
 677
 678         seq = (struct seq_file *) file->private_data;
 679         seq->private = dl;
 680
 681         dlm_grab(dlm);
 682         dl->dl_ctxt = dlm;
 683
 684         return 0;
 685 bail:
 686         if (dl)
 687                 kfree(dl->dl_buf);
 688         kfree(dl);
 689         return ret;
 690 }
 691
 692 static int debug_lockres_release(struct inode *inode, struct file *file)
 693 {
 694         struct seq_file *seq = (struct seq_file *)file->private_data;
 695         struct debug_lockres *dl = (struct debug_lockres *)seq->private;
 696
 697         if (dl->dl_res)
 698                 dlm_lockres_put(dl->dl_res);
 699         dlm_put(dl->dl_ctxt);
 700         kfree(dl->dl_buf);
 701         return seq_release_private(inode, file);
 702 }
 703
 704 static struct file_operations debug_lockres_fops = {
 705         .open =         debug_lockres_open,
 706         .release =      debug_lockres_release,
 707         .read =         seq_read,
 708         .llseek =       seq_lseek,
 709 };
 710 /* end - debug lockres funcs */
 711
 712 /* begin - debug state funcs */
 713 static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 714 {
 715         int out = 0;
 716         struct dlm_reco_node_data *node;
 717         char *state;
 718         int lres, rres, ures, tres;
 719
 720         lres = atomic_read(&dlm->local_resources);
 721         rres = atomic_read(&dlm->remote_resources);
 722         ures = atomic_read(&dlm->unknown_resources);
 723         tres = lres + rres + ures;
 724
 725         spin_lock(&dlm->spinlock);
 726
 727         switch (dlm->dlm_state) {
 728         case DLM_CTXT_NEW:
 729                 state = "NEW"; break;
 730         case DLM_CTXT_JOINED:
 731                 state = "JOINED"; break;
 732         case DLM_CTXT_IN_SHUTDOWN:
 733                 state = "SHUTDOWN"; break;
 734         case DLM_CTXT_LEAVING:
 735                 state = "LEAVING"; break;
 736         default:
 737                 state = "UNKNOWN"; break;
 738         }
 739
 740         /* Domain: xxxxxxxxxx  Key: 0xdfbac769 */
 741         out += snprintf(db->buf + out, db->len - out,
 742                         "Domain: %s  Key: 0x%08x\n", dlm->name, dlm->key);
 743
 744         /* Thread Pid: xxx  Node: xxx  State: xxxxx */
 745         out += snprintf(db->buf + out, db->len - out,
 746                         "Thread Pid: %d  Node: %d  State: %s\n",
 747                         dlm->dlm_thread_task->pid, dlm->node_num, state);
 748
 749         /* Number of Joins: xxx  Joining Node: xxx */
 750         out += snprintf(db->buf + out, db->len - out,
 751                         "Number of Joins: %d  Joining Node: %d\n",
 752                         dlm->num_joins, dlm->joining_node);
 753
 754         /* Domain Map: xx xx xx */
 755         out += snprintf(db->buf + out, db->len - out, "Domain Map: ");
 756         out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
 757                                  db->buf + out, db->len - out);
 758         out += snprintf(db->buf + out, db->len - out, "\n");
 759
 760         /* Live Map: xx xx xx */
 761         out += snprintf(db->buf + out, db->len - out, "Live Map: ");
 762         out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
 763                                  db->buf + out, db->len - out);
 764         out += snprintf(db->buf + out, db->len - out, "\n");
 765
 766         /* Mastered Resources Total: xxx  Locally: xxx  Remotely: ... */
 767         out += snprintf(db->buf + out, db->len - out,
 768                         "Mastered Resources Total: %d  Locally: %d  "
 769                         "Remotely: %d  Unknown: %d\n",
 770                         tres, lres, rres, ures);
 771
 772         /* Lists: Dirty=Empty  Purge=InUse  PendingASTs=Empty  ... */
 773         out += snprintf(db->buf + out, db->len - out,
 774                         "Lists: Dirty=%s  Purge=%s  PendingASTs=%s  "
 775                         "PendingBASTs=%s  Master=%s\n",
 776                         (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
 777                         (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
 778                         (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
 779                         (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"),
 780                         (list_empty(&dlm->master_list) ? "Empty" : "InUse"));
 781
 782         /* Purge Count: xxx  Refs: xxx */
 783         out += snprintf(db->buf + out, db->len - out,
 784                         "Purge Count: %d  Refs: %d\n", dlm->purge_count,
 785                         atomic_read(&dlm->dlm_refs.refcount));
 786
 787         /* Dead Node: xxx */
 788         out += snprintf(db->buf + out, db->len - out,
 789                         "Dead Node: %d\n", dlm->reco.dead_node);
 790
 791         /* What about DLM_RECO_STATE_FINALIZE? */
 792         if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
 793                 state = "ACTIVE";
 794         else
 795                 state = "INACTIVE";
 796
 797         /* Recovery Pid: xxxx  Master: xxx  State: xxxx */
 798         out += snprintf(db->buf + out, db->len - out,
 799                         "Recovery Pid: %d  Master: %d  State: %s\n",
 800                         dlm->dlm_reco_thread_task->pid,
 801                         dlm->reco.new_master, state);
 802
 803         /* Recovery Map: xx xx */
 804         out += snprintf(db->buf + out, db->len - out, "Recovery Map: ");
 805         out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
 806                                  db->buf + out, db->len - out);
 807         out += snprintf(db->buf + out, db->len - out, "\n");
 808
 809         /* Recovery Node State: */
 810         out += snprintf(db->buf + out, db->len - out, "Recovery Node State:\n");
 811         list_for_each_entry(node, &dlm->reco.node_data, list) {
 812                 switch (node->state) {
 813                 case DLM_RECO_NODE_DATA_INIT:
 814                         state = "INIT";
 815                         break;
 816                 case DLM_RECO_NODE_DATA_REQUESTING:
 817                         state = "REQUESTING";
 818                         break;
 819                 case DLM_RECO_NODE_DATA_DEAD:
 820                         state = "DEAD";
 821                         break;
 822                 case DLM_RECO_NODE_DATA_RECEIVING:
 823                         state = "RECEIVING";
 824                         break;
 825                 case DLM_RECO_NODE_DATA_REQUESTED:
 826                         state = "REQUESTED";
 827                         break;
 828                 case DLM_RECO_NODE_DATA_DONE:
 829                         state = "DONE";
 830                         break;
 831                 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
 832                         state = "FINALIZE-SENT";
 833                         break;
 834                 default:
 835                         state = "BAD";
 836                         break;
 837                 }
 838                 out += snprintf(db->buf + out, db->len - out, "\t%u - %s\n",
 839                                 node->node_num, state);
 840         }
 841
 842         spin_unlock(&dlm->spinlock);
 843
 844         return out;
 845 }
 846
 847 static int debug_state_open(struct inode *inode, struct file *file)
 848 {
 849         struct dlm_ctxt *dlm = inode->i_private;
 850         struct debug_buffer *db = NULL;
 851
 852         db = debug_buffer_allocate();
 853         if (!db)
 854                 goto bail;
 855
 856         db->len = debug_state_print(dlm, db);
 857
 858         file->private_data = db;
 859
 860         return 0;
 861 bail:
 862         return -ENOMEM;
 863 }
 864
 865 static struct file_operations debug_state_fops = {
 866         .open =         debug_state_open,
 867         .release =      debug_buffer_release,
 868         .read =         debug_buffer_read,
 869         .llseek =       debug_buffer_llseek,
 870 };
 871 /* end  - debug state funcs */
 872
 873 /* files in subroot */
 874 int dlm_debug_init(struct dlm_ctxt *dlm)
 875 {
 876         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
 877
 878         /* for dumping dlm_ctxt */
 879         dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
 880                                                      S_IFREG|S_IRUSR,
 881                                                      dlm->dlm_debugfs_subroot,
 882                                                      dlm, &debug_state_fops);
 883         if (!dc->debug_state_dentry) {
 884                 mlog_errno(-ENOMEM);
 885                 goto bail;
 886         }
 887
 888         /* for dumping lockres */
 889         dc->debug_lockres_dentry =
 890                         debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
 891                                             S_IFREG|S_IRUSR,
 892                                             dlm->dlm_debugfs_subroot,
 893                                             dlm, &debug_lockres_fops);
 894         if (!dc->debug_lockres_dentry) {
 895                 mlog_errno(-ENOMEM);
 896                 goto bail;
 897         }
 898
 899         /* for dumping mles */
 900         dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,
 901                                                    S_IFREG|S_IRUSR,
 902                                                    dlm->dlm_debugfs_subroot,
 903                                                    dlm, &debug_mle_fops);
 904         if (!dc->debug_mle_dentry) {
 905                 mlog_errno(-ENOMEM);
 906                 goto bail;
 907         }
 908
 909         dlm_debug_get(dc);
 910         return 0;
 911
 912 bail:
 913         dlm_debug_shutdown(dlm);
 914         return -ENOMEM;
 915 }
 916
 917 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
 918 {
 919         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
 920
 921         if (dc) {
 922                 if (dc->debug_mle_dentry)
 923                         debugfs_remove(dc->debug_mle_dentry);
 924                 if (dc->debug_lockres_dentry)
 925                         debugfs_remove(dc->debug_lockres_dentry);
 926                 if (dc->debug_state_dentry)
 927                         debugfs_remove(dc->debug_state_dentry);
 928                 dlm_debug_put(dc);
 929         }
 930 }
 931
 932 /* subroot - domain dir */
 933 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
 934 {
 935         dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
 936                                                       dlm_debugfs_root);
 937         if (!dlm->dlm_debugfs_subroot) {
 938                 mlog_errno(-ENOMEM);
 939                 goto bail;
 940         }
 941
 942         dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
 943                                       GFP_KERNEL);
 944         if (!dlm->dlm_debug_ctxt) {
 945                 mlog_errno(-ENOMEM);
 946                 goto bail;
 947         }
 948         kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
 949
 950         return 0;
 951 bail:
 952         dlm_destroy_debugfs_subroot(dlm);
 953         return -ENOMEM;
 954 }
 955
 956 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
 957 {
 958         if (dlm->dlm_debugfs_subroot)
 959                 debugfs_remove(dlm->dlm_debugfs_subroot);
 960 }
 961
 962 /* debugfs root */
 963 int dlm_create_debugfs_root(void)
 964 {
 965         dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
 966         if (!dlm_debugfs_root) {
 967                 mlog_errno(-ENOMEM);
 968                 return -ENOMEM;
 969         }
 970         return 0;
 971 }
 972
 973 void dlm_destroy_debugfs_root(void)
 974 {
 975         if (dlm_debugfs_root)
 976                 debugfs_remove(dlm_debugfs_root);
 977 }
 978 #endif  /* CONFIG_DEBUG_FS */