1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * dlmdebug.c 5 * 6 * debug functionality for the dlm 7 * 8 * Copyright (C) 2004, 2008 Oracle. All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public 12 * License as published by the Free Software Foundation; either 13 * version 2 of the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public 21 * License along with this program; if not, write to the 22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23 * Boston, MA 021110-1307, USA. 24 * 25 */ 26 27 #include <linux/types.h> 28 #include <linux/slab.h> 29 #include <linux/highmem.h> 30 #include <linux/sysctl.h> 31 #include <linux/spinlock.h> 32 #include <linux/debugfs.h> 33 #include <linux/export.h> 34 35 #include "cluster/heartbeat.h" 36 #include "cluster/nodemanager.h" 37 #include "cluster/tcp.h" 38 39 #include "dlmapi.h" 40 #include "dlmcommon.h" 41 #include "dlmdomain.h" 42 #include "dlmdebug.h" 43 44 #define MLOG_MASK_PREFIX ML_DLM 45 #include "cluster/masklog.h" 46 47 static int stringify_lockname(const char *lockname, int locklen, char *buf, 48 int len); 49 50 void dlm_print_one_lock_resource(struct dlm_lock_resource *res) 51 { 52 spin_lock(&res->spinlock); 53 __dlm_print_one_lock_resource(res); 54 spin_unlock(&res->spinlock); 55 } 56 57 static void dlm_print_lockres_refmap(struct dlm_lock_resource *res) 58 { 59 int bit; 60 assert_spin_locked(&res->spinlock); 61 62 printk(" refmap nodes: [ "); 63 bit = 0; 64 while (1) { 65 bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit); 66 if (bit >= O2NM_MAX_NODES) 67 break; 68 printk("%u ", bit); 69 bit++; 70 } 71 printk("], inflight=%u\n", res->inflight_locks); 72 } 73 74 static void __dlm_print_lock(struct dlm_lock *lock) 75 { 76 spin_lock(&lock->spinlock); 77 78 printk(" type=%d, conv=%d, node=%u, cookie=%u:%llu, " 79 "ref=%u, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c), " 80 "pending=(conv=%c,lock=%c,cancel=%c,unlock=%c)\n", 81 lock->ml.type, lock->ml.convert_type, lock->ml.node, 82 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), 83 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), 84 atomic_read(&lock->lock_refs.refcount), 85 (list_empty(&lock->ast_list) ? 'y' : 'n'), 86 (lock->ast_pending ? 'y' : 'n'), 87 (list_empty(&lock->bast_list) ? 'y' : 'n'), 88 (lock->bast_pending ? 'y' : 'n'), 89 (lock->convert_pending ? 'y' : 'n'), 90 (lock->lock_pending ? 'y' : 'n'), 91 (lock->cancel_pending ? 'y' : 'n'), 92 (lock->unlock_pending ? 'y' : 'n')); 93 94 spin_unlock(&lock->spinlock); 95 } 96 97 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res) 98 { 99 struct list_head *iter2; 100 struct dlm_lock *lock; 101 char buf[DLM_LOCKID_NAME_MAX]; 102 103 assert_spin_locked(&res->spinlock); 104 105 stringify_lockname(res->lockname.name, res->lockname.len, 106 buf, sizeof(buf)); 107 printk("lockres: %s, owner=%u, state=%u\n", 108 buf, res->owner, res->state); 109 printk(" last used: %lu, refcnt: %u, on purge list: %s\n", 110 res->last_used, atomic_read(&res->refs.refcount), 111 list_empty(&res->purge) ? "no" : "yes"); 112 printk(" on dirty list: %s, on reco list: %s, " 113 "migrating pending: %s\n", 114 list_empty(&res->dirty) ? "no" : "yes", 115 list_empty(&res->recovering) ? "no" : "yes", 116 res->migration_pending ? "yes" : "no"); 117 printk(" inflight locks: %d, asts reserved: %d\n", 118 res->inflight_locks, atomic_read(&res->asts_reserved)); 119 dlm_print_lockres_refmap(res); 120 printk(" granted queue:\n"); 121 list_for_each(iter2, &res->granted) { 122 lock = list_entry(iter2, struct dlm_lock, list); 123 __dlm_print_lock(lock); 124 } 125 printk(" converting queue:\n"); 126 list_for_each(iter2, &res->converting) { 127 lock = list_entry(iter2, struct dlm_lock, list); 128 __dlm_print_lock(lock); 129 } 130 printk(" blocked queue:\n"); 131 list_for_each(iter2, &res->blocked) { 132 lock = list_entry(iter2, struct dlm_lock, list); 133 __dlm_print_lock(lock); 134 } 135 } 136 137 void dlm_print_one_lock(struct dlm_lock *lockid) 138 { 139 dlm_print_one_lock_resource(lockid->lockres); 140 } 141 EXPORT_SYMBOL_GPL(dlm_print_one_lock); 142 143 static const char *dlm_errnames[] = { 144 [DLM_NORMAL] = "DLM_NORMAL", 145 [DLM_GRANTED] = "DLM_GRANTED", 146 [DLM_DENIED] = "DLM_DENIED", 147 [DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS", 148 [DLM_WORKING] = "DLM_WORKING", 149 [DLM_BLOCKED] = "DLM_BLOCKED", 150 [DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN", 151 [DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD", 152 [DLM_SYSERR] = "DLM_SYSERR", 153 [DLM_NOSUPPORT] = "DLM_NOSUPPORT", 154 [DLM_CANCELGRANT] = "DLM_CANCELGRANT", 155 [DLM_IVLOCKID] = "DLM_IVLOCKID", 156 [DLM_SYNC] = "DLM_SYNC", 157 [DLM_BADTYPE] = "DLM_BADTYPE", 158 [DLM_BADRESOURCE] = "DLM_BADRESOURCE", 159 [DLM_MAXHANDLES] = "DLM_MAXHANDLES", 160 [DLM_NOCLINFO] = "DLM_NOCLINFO", 161 [DLM_NOLOCKMGR] = "DLM_NOLOCKMGR", 162 [DLM_NOPURGED] = "DLM_NOPURGED", 163 [DLM_BADARGS] = "DLM_BADARGS", 164 [DLM_VOID] = "DLM_VOID", 165 [DLM_NOTQUEUED] = "DLM_NOTQUEUED", 166 [DLM_IVBUFLEN] = "DLM_IVBUFLEN", 167 [DLM_CVTUNGRANT] = "DLM_CVTUNGRANT", 168 [DLM_BADPARAM] = "DLM_BADPARAM", 169 [DLM_VALNOTVALID] = "DLM_VALNOTVALID", 170 [DLM_REJECTED] = "DLM_REJECTED", 171 [DLM_ABORT] = "DLM_ABORT", 172 [DLM_CANCEL] = "DLM_CANCEL", 173 [DLM_IVRESHANDLE] = "DLM_IVRESHANDLE", 174 [DLM_DEADLOCK] = "DLM_DEADLOCK", 175 [DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS", 176 [DLM_FORWARD] = "DLM_FORWARD", 177 [DLM_TIMEOUT] = "DLM_TIMEOUT", 178 [DLM_IVGROUPID] = "DLM_IVGROUPID", 179 [DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT", 180 [DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH", 181 [DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION", 182 [DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ", 183 [DLM_RECOVERING] = "DLM_RECOVERING", 184 [DLM_MIGRATING] = "DLM_MIGRATING", 185 [DLM_MAXSTATS] = "DLM_MAXSTATS", 186 }; 187 188 static const char *dlm_errmsgs[] = { 189 [DLM_NORMAL] = "request in progress", 190 [DLM_GRANTED] = "request granted", 191 [DLM_DENIED] = "request denied", 192 [DLM_DENIED_NOLOCKS] = "request denied, out of system resources", 193 [DLM_WORKING] = "async request in progress", 194 [DLM_BLOCKED] = "lock request blocked", 195 [DLM_BLOCKED_ORPHAN] = "lock request blocked by a orphan lock", 196 [DLM_DENIED_GRACE_PERIOD] = "topological change in progress", 197 [DLM_SYSERR] = "system error", 198 [DLM_NOSUPPORT] = "unsupported", 199 [DLM_CANCELGRANT] = "can't cancel convert: already granted", 200 [DLM_IVLOCKID] = "bad lockid", 201 [DLM_SYNC] = "synchronous request granted", 202 [DLM_BADTYPE] = "bad resource type", 203 [DLM_BADRESOURCE] = "bad resource handle", 204 [DLM_MAXHANDLES] = "no more resource handles", 205 [DLM_NOCLINFO] = "can't contact cluster manager", 206 [DLM_NOLOCKMGR] = "can't contact lock manager", 207 [DLM_NOPURGED] = "can't contact purge daemon", 208 [DLM_BADARGS] = "bad api args", 209 [DLM_VOID] = "no status", 210 [DLM_NOTQUEUED] = "NOQUEUE was specified and request failed", 211 [DLM_IVBUFLEN] = "invalid resource name length", 212 [DLM_CVTUNGRANT] = "attempted to convert ungranted lock", 213 [DLM_BADPARAM] = "invalid lock mode specified", 214 [DLM_VALNOTVALID] = "value block has been invalidated", 215 [DLM_REJECTED] = "request rejected, unrecognized client", 216 [DLM_ABORT] = "blocked lock request cancelled", 217 [DLM_CANCEL] = "conversion request cancelled", 218 [DLM_IVRESHANDLE] = "invalid resource handle", 219 [DLM_DEADLOCK] = "deadlock recovery refused this request", 220 [DLM_DENIED_NOASTS] = "failed to allocate AST", 221 [DLM_FORWARD] = "request must wait for primary's response", 222 [DLM_TIMEOUT] = "timeout value for lock has expired", 223 [DLM_IVGROUPID] = "invalid group specification", 224 [DLM_VERS_CONFLICT] = "version conflicts prevent request handling", 225 [DLM_BAD_DEVICE_PATH] = "Locks device does not exist or path wrong", 226 [DLM_NO_DEVICE_PERMISSION] = "Client has insufficient perms for device", 227 [DLM_NO_CONTROL_DEVICE] = "Cannot set options on opened device ", 228 [DLM_RECOVERING] = "lock resource being recovered", 229 [DLM_MIGRATING] = "lock resource being migrated", 230 [DLM_MAXSTATS] = "invalid error number", 231 }; 232 233 const char *dlm_errmsg(enum dlm_status err) 234 { 235 if (err >= DLM_MAXSTATS || err < 0) 236 return dlm_errmsgs[DLM_MAXSTATS]; 237 return dlm_errmsgs[err]; 238 } 239 EXPORT_SYMBOL_GPL(dlm_errmsg); 240 241 const char *dlm_errname(enum dlm_status err) 242 { 243 if (err >= DLM_MAXSTATS || err < 0) 244 return dlm_errnames[DLM_MAXSTATS]; 245 return dlm_errnames[err]; 246 } 247 EXPORT_SYMBOL_GPL(dlm_errname); 248 249 /* NOTE: This function converts a lockname into a string. It uses knowledge 250 * of the format of the lockname that should be outside the purview of the dlm. 251 * We are adding only to make dlm debugging slightly easier. 252 * 253 * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h. 254 */ 255 static int stringify_lockname(const char *lockname, int locklen, char *buf, 256 int len) 257 { 258 int out = 0; 259 __be64 inode_blkno_be; 260 261 #define OCFS2_DENTRY_LOCK_INO_START 18 262 if (*lockname == 'N') { 263 memcpy((__be64 *)&inode_blkno_be, 264 (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START], 265 sizeof(__be64)); 266 out += snprintf(buf + out, len - out, "%.*s%08x", 267 OCFS2_DENTRY_LOCK_INO_START - 1, lockname, 268 (unsigned int)be64_to_cpu(inode_blkno_be)); 269 } else 270 out += snprintf(buf + out, len - out, "%.*s", 271 locklen, lockname); 272 return out; 273 } 274 275 static int stringify_nodemap(unsigned long *nodemap, int maxnodes, 276 char *buf, int len) 277 { 278 int out = 0; 279 int i = -1; 280 281 while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes) 282 out += snprintf(buf + out, len - out, "%d ", i); 283 284 return out; 285 } 286 287 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len) 288 { 289 int out = 0; 290 char *mle_type; 291 292 if (mle->type == DLM_MLE_BLOCK) 293 mle_type = "BLK"; 294 else if (mle->type == DLM_MLE_MASTER) 295 mle_type = "MAS"; 296 else 297 mle_type = "MIG"; 298 299 out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out); 300 out += snprintf(buf + out, len - out, 301 "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n", 302 mle_type, mle->master, mle->new_master, 303 !list_empty(&mle->hb_events), 304 !!mle->inuse, 305 atomic_read(&mle->mle_refs.refcount)); 306 307 out += snprintf(buf + out, len - out, "Maybe="); 308 out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES, 309 buf + out, len - out); 310 out += snprintf(buf + out, len - out, "\n"); 311 312 out += snprintf(buf + out, len - out, "Vote="); 313 out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES, 314 buf + out, len - out); 315 out += snprintf(buf + out, len - out, "\n"); 316 317 out += snprintf(buf + out, len - out, "Response="); 318 out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES, 319 buf + out, len - out); 320 out += snprintf(buf + out, len - out, "\n"); 321 322 out += snprintf(buf + out, len - out, "Node="); 323 out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES, 324 buf + out, len - out); 325 out += snprintf(buf + out, len - out, "\n"); 326 327 out += snprintf(buf + out, len - out, "\n"); 328 329 return out; 330 } 331 332 void dlm_print_one_mle(struct dlm_master_list_entry *mle) 333 { 334 char *buf; 335 336 buf = (char *) get_zeroed_page(GFP_NOFS); 337 if (buf) { 338 dump_mle(mle, buf, PAGE_SIZE - 1); 339 free_page((unsigned long)buf); 340 } 341 } 342 343 #ifdef CONFIG_DEBUG_FS 344 345 static struct dentry *dlm_debugfs_root = NULL; 346 347 #define DLM_DEBUGFS_DIR "o2dlm" 348 #define DLM_DEBUGFS_DLM_STATE "dlm_state" 349 #define DLM_DEBUGFS_LOCKING_STATE "locking_state" 350 #define DLM_DEBUGFS_MLE_STATE "mle_state" 351 #define DLM_DEBUGFS_PURGE_LIST "purge_list" 352 353 /* begin - utils funcs */ 354 static void dlm_debug_free(struct kref *kref) 355 { 356 struct dlm_debug_ctxt *dc; 357 358 dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt); 359 360 kfree(dc); 361 } 362 363 static void dlm_debug_put(struct dlm_debug_ctxt *dc) 364 { 365 if (dc) 366 kref_put(&dc->debug_refcnt, dlm_debug_free); 367 } 368 369 static void dlm_debug_get(struct dlm_debug_ctxt *dc) 370 { 371 kref_get(&dc->debug_refcnt); 372 } 373 374 static int debug_release(struct inode *inode, struct file *file) 375 { 376 free_page((unsigned long)file->private_data); 377 return 0; 378 } 379 380 static ssize_t debug_read(struct file *file, char __user *buf, 381 size_t nbytes, loff_t *ppos) 382 { 383 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, 384 i_size_read(file->f_mapping->host)); 385 } 386 /* end - util funcs */ 387 388 /* begin - purge list funcs */ 389 static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len) 390 { 391 struct dlm_lock_resource *res; 392 int out = 0; 393 unsigned long total = 0; 394 395 out += snprintf(buf + out, len - out, 396 "Dumping Purgelist for Domain: %s\n", dlm->name); 397 398 spin_lock(&dlm->spinlock); 399 list_for_each_entry(res, &dlm->purge_list, purge) { 400 ++total; 401 if (len - out < 100) 402 continue; 403 spin_lock(&res->spinlock); 404 out += stringify_lockname(res->lockname.name, 405 res->lockname.len, 406 buf + out, len - out); 407 out += snprintf(buf + out, len - out, "\t%ld\n", 408 (jiffies - res->last_used)/HZ); 409 spin_unlock(&res->spinlock); 410 } 411 spin_unlock(&dlm->spinlock); 412 413 out += snprintf(buf + out, len - out, "Total on list: %ld\n", total); 414 415 return out; 416 } 417 418 static int debug_purgelist_open(struct inode *inode, struct file *file) 419 { 420 struct dlm_ctxt *dlm = inode->i_private; 421 char *buf = NULL; 422 423 buf = (char *) get_zeroed_page(GFP_NOFS); 424 if (!buf) 425 goto bail; 426 427 i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1)); 428 429 file->private_data = buf; 430 431 return 0; 432 bail: 433 return -ENOMEM; 434 } 435 436 static const struct file_operations debug_purgelist_fops = { 437 .open = debug_purgelist_open, 438 .release = debug_release, 439 .read = debug_read, 440 .llseek = generic_file_llseek, 441 }; 442 /* end - purge list funcs */ 443 444 /* begin - debug mle funcs */ 445 static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len) 446 { 447 struct dlm_master_list_entry *mle; 448 struct hlist_head *bucket; 449 struct hlist_node *list; 450 int i, out = 0; 451 unsigned long total = 0, longest = 0, bucket_count = 0; 452 453 out += snprintf(buf + out, len - out, 454 "Dumping MLEs for Domain: %s\n", dlm->name); 455 456 spin_lock(&dlm->master_lock); 457 for (i = 0; i < DLM_HASH_BUCKETS; i++) { 458 bucket = dlm_master_hash(dlm, i); 459 hlist_for_each(list, bucket) { 460 mle = hlist_entry(list, struct dlm_master_list_entry, 461 master_hash_node); 462 ++total; 463 ++bucket_count; 464 if (len - out < 200) 465 continue; 466 out += dump_mle(mle, buf + out, len - out); 467 } 468 longest = max(longest, bucket_count); 469 bucket_count = 0; 470 } 471 spin_unlock(&dlm->master_lock); 472 473 out += snprintf(buf + out, len - out, 474 "Total: %ld, Longest: %ld\n", total, longest); 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 char *buf = NULL; 482 483 buf = (char *) get_zeroed_page(GFP_NOFS); 484 if (!buf) 485 goto bail; 486 487 i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1)); 488 489 file->private_data = buf; 490 491 return 0; 492 bail: 493 return -ENOMEM; 494 } 495 496 static const struct file_operations debug_mle_fops = { 497 .open = debug_mle_open, 498 .release = debug_release, 499 .read = debug_read, 500 .llseek = generic_file_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 *oldres = dl->dl_res; 588 struct dlm_lock_resource *res = NULL; 589 struct list_head *track_list; 590 591 spin_lock(&dlm->track_lock); 592 if (oldres) 593 track_list = &oldres->tracking; 594 else { 595 track_list = &dlm->tracking_list; 596 if (list_empty(track_list)) { 597 dl = NULL; 598 spin_unlock(&dlm->track_lock); 599 goto bail; 600 } 601 } 602 603 list_for_each_entry(res, track_list, tracking) { 604 if (&res->tracking == &dlm->tracking_list) 605 res = NULL; 606 else 607 dlm_lockres_get(res); 608 break; 609 } 610 spin_unlock(&dlm->track_lock); 611 612 if (oldres) 613 dlm_lockres_put(oldres); 614 615 dl->dl_res = res; 616 617 if (res) { 618 spin_lock(&res->spinlock); 619 dump_lockres(res, dl->dl_buf, dl->dl_len - 1); 620 spin_unlock(&res->spinlock); 621 } else 622 dl = NULL; 623 624 bail: 625 /* passed to seq_show */ 626 return dl; 627 } 628 629 static void lockres_seq_stop(struct seq_file *m, void *v) 630 { 631 } 632 633 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos) 634 { 635 return NULL; 636 } 637 638 static int lockres_seq_show(struct seq_file *s, void *v) 639 { 640 struct debug_lockres *dl = (struct debug_lockres *)v; 641 642 seq_printf(s, "%s", dl->dl_buf); 643 644 return 0; 645 } 646 647 static const struct seq_operations debug_lockres_ops = { 648 .start = lockres_seq_start, 649 .stop = lockres_seq_stop, 650 .next = lockres_seq_next, 651 .show = lockres_seq_show, 652 }; 653 654 static int debug_lockres_open(struct inode *inode, struct file *file) 655 { 656 struct dlm_ctxt *dlm = inode->i_private; 657 int ret = -ENOMEM; 658 struct seq_file *seq; 659 struct debug_lockres *dl = NULL; 660 661 dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL); 662 if (!dl) { 663 mlog_errno(ret); 664 goto bail; 665 } 666 667 dl->dl_len = PAGE_SIZE; 668 dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL); 669 if (!dl->dl_buf) { 670 mlog_errno(ret); 671 goto bail; 672 } 673 674 ret = seq_open(file, &debug_lockres_ops); 675 if (ret) { 676 mlog_errno(ret); 677 goto bail; 678 } 679 680 seq = file->private_data; 681 seq->private = dl; 682 683 dlm_grab(dlm); 684 dl->dl_ctxt = dlm; 685 686 return 0; 687 bail: 688 if (dl) 689 kfree(dl->dl_buf); 690 kfree(dl); 691 return ret; 692 } 693 694 static int debug_lockres_release(struct inode *inode, struct file *file) 695 { 696 struct seq_file *seq = file->private_data; 697 struct debug_lockres *dl = (struct debug_lockres *)seq->private; 698 699 if (dl->dl_res) 700 dlm_lockres_put(dl->dl_res); 701 dlm_put(dl->dl_ctxt); 702 kfree(dl->dl_buf); 703 return seq_release_private(inode, file); 704 } 705 706 static const struct file_operations debug_lockres_fops = { 707 .open = debug_lockres_open, 708 .release = debug_lockres_release, 709 .read = seq_read, 710 .llseek = seq_lseek, 711 }; 712 /* end - debug lockres funcs */ 713 714 /* begin - debug state funcs */ 715 static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len) 716 { 717 int out = 0; 718 struct dlm_reco_node_data *node; 719 char *state; 720 int cur_mles = 0, tot_mles = 0; 721 int i; 722 723 spin_lock(&dlm->spinlock); 724 725 switch (dlm->dlm_state) { 726 case DLM_CTXT_NEW: 727 state = "NEW"; break; 728 case DLM_CTXT_JOINED: 729 state = "JOINED"; break; 730 case DLM_CTXT_IN_SHUTDOWN: 731 state = "SHUTDOWN"; break; 732 case DLM_CTXT_LEAVING: 733 state = "LEAVING"; break; 734 default: 735 state = "UNKNOWN"; break; 736 } 737 738 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */ 739 out += snprintf(buf + out, len - out, 740 "Domain: %s Key: 0x%08x Protocol: %d.%d\n", 741 dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major, 742 dlm->dlm_locking_proto.pv_minor); 743 744 /* Thread Pid: xxx Node: xxx State: xxxxx */ 745 out += snprintf(buf + out, len - out, 746 "Thread Pid: %d Node: %d State: %s\n", 747 task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state); 748 749 /* Number of Joins: xxx Joining Node: xxx */ 750 out += snprintf(buf + out, 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(buf + out, len - out, "Domain Map: "); 756 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES, 757 buf + out, len - out); 758 out += snprintf(buf + out, len - out, "\n"); 759 760 /* Exit Domain Map: xx xx xx */ 761 out += snprintf(buf + out, len - out, "Exit Domain Map: "); 762 out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES, 763 buf + out, len - out); 764 out += snprintf(buf + out, len - out, "\n"); 765 766 /* Live Map: xx xx xx */ 767 out += snprintf(buf + out, len - out, "Live Map: "); 768 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES, 769 buf + out, len - out); 770 out += snprintf(buf + out, len - out, "\n"); 771 772 /* Lock Resources: xxx (xxx) */ 773 out += snprintf(buf + out, len - out, 774 "Lock Resources: %d (%d)\n", 775 atomic_read(&dlm->res_cur_count), 776 atomic_read(&dlm->res_tot_count)); 777 778 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) 779 tot_mles += atomic_read(&dlm->mle_tot_count[i]); 780 781 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) 782 cur_mles += atomic_read(&dlm->mle_cur_count[i]); 783 784 /* MLEs: xxx (xxx) */ 785 out += snprintf(buf + out, len - out, 786 "MLEs: %d (%d)\n", cur_mles, tot_mles); 787 788 /* Blocking: xxx (xxx) */ 789 out += snprintf(buf + out, len - out, 790 " Blocking: %d (%d)\n", 791 atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]), 792 atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK])); 793 794 /* Mastery: xxx (xxx) */ 795 out += snprintf(buf + out, len - out, 796 " Mastery: %d (%d)\n", 797 atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]), 798 atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER])); 799 800 /* Migration: xxx (xxx) */ 801 out += snprintf(buf + out, len - out, 802 " Migration: %d (%d)\n", 803 atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]), 804 atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION])); 805 806 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */ 807 out += snprintf(buf + out, len - out, 808 "Lists: Dirty=%s Purge=%s PendingASTs=%s " 809 "PendingBASTs=%s\n", 810 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"), 811 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"), 812 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"), 813 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse")); 814 815 /* Purge Count: xxx Refs: xxx */ 816 out += snprintf(buf + out, len - out, 817 "Purge Count: %d Refs: %d\n", dlm->purge_count, 818 atomic_read(&dlm->dlm_refs.refcount)); 819 820 /* Dead Node: xxx */ 821 out += snprintf(buf + out, len - out, 822 "Dead Node: %d\n", dlm->reco.dead_node); 823 824 /* What about DLM_RECO_STATE_FINALIZE? */ 825 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE) 826 state = "ACTIVE"; 827 else 828 state = "INACTIVE"; 829 830 /* Recovery Pid: xxxx Master: xxx State: xxxx */ 831 out += snprintf(buf + out, len - out, 832 "Recovery Pid: %d Master: %d State: %s\n", 833 task_pid_nr(dlm->dlm_reco_thread_task), 834 dlm->reco.new_master, state); 835 836 /* Recovery Map: xx xx */ 837 out += snprintf(buf + out, len - out, "Recovery Map: "); 838 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES, 839 buf + out, len - out); 840 out += snprintf(buf + out, len - out, "\n"); 841 842 /* Recovery Node State: */ 843 out += snprintf(buf + out, len - out, "Recovery Node State:\n"); 844 list_for_each_entry(node, &dlm->reco.node_data, list) { 845 switch (node->state) { 846 case DLM_RECO_NODE_DATA_INIT: 847 state = "INIT"; 848 break; 849 case DLM_RECO_NODE_DATA_REQUESTING: 850 state = "REQUESTING"; 851 break; 852 case DLM_RECO_NODE_DATA_DEAD: 853 state = "DEAD"; 854 break; 855 case DLM_RECO_NODE_DATA_RECEIVING: 856 state = "RECEIVING"; 857 break; 858 case DLM_RECO_NODE_DATA_REQUESTED: 859 state = "REQUESTED"; 860 break; 861 case DLM_RECO_NODE_DATA_DONE: 862 state = "DONE"; 863 break; 864 case DLM_RECO_NODE_DATA_FINALIZE_SENT: 865 state = "FINALIZE-SENT"; 866 break; 867 default: 868 state = "BAD"; 869 break; 870 } 871 out += snprintf(buf + out, len - out, "\t%u - %s\n", 872 node->node_num, state); 873 } 874 875 spin_unlock(&dlm->spinlock); 876 877 return out; 878 } 879 880 static int debug_state_open(struct inode *inode, struct file *file) 881 { 882 struct dlm_ctxt *dlm = inode->i_private; 883 char *buf = NULL; 884 885 buf = (char *) get_zeroed_page(GFP_NOFS); 886 if (!buf) 887 goto bail; 888 889 i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1)); 890 891 file->private_data = buf; 892 893 return 0; 894 bail: 895 return -ENOMEM; 896 } 897 898 static const struct file_operations debug_state_fops = { 899 .open = debug_state_open, 900 .release = debug_release, 901 .read = debug_read, 902 .llseek = generic_file_llseek, 903 }; 904 /* end - debug state funcs */ 905 906 /* files in subroot */ 907 int dlm_debug_init(struct dlm_ctxt *dlm) 908 { 909 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt; 910 911 /* for dumping dlm_ctxt */ 912 dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE, 913 S_IFREG|S_IRUSR, 914 dlm->dlm_debugfs_subroot, 915 dlm, &debug_state_fops); 916 if (!dc->debug_state_dentry) { 917 mlog_errno(-ENOMEM); 918 goto bail; 919 } 920 921 /* for dumping lockres */ 922 dc->debug_lockres_dentry = 923 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE, 924 S_IFREG|S_IRUSR, 925 dlm->dlm_debugfs_subroot, 926 dlm, &debug_lockres_fops); 927 if (!dc->debug_lockres_dentry) { 928 mlog_errno(-ENOMEM); 929 goto bail; 930 } 931 932 /* for dumping mles */ 933 dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE, 934 S_IFREG|S_IRUSR, 935 dlm->dlm_debugfs_subroot, 936 dlm, &debug_mle_fops); 937 if (!dc->debug_mle_dentry) { 938 mlog_errno(-ENOMEM); 939 goto bail; 940 } 941 942 /* for dumping lockres on the purge list */ 943 dc->debug_purgelist_dentry = 944 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST, 945 S_IFREG|S_IRUSR, 946 dlm->dlm_debugfs_subroot, 947 dlm, &debug_purgelist_fops); 948 if (!dc->debug_purgelist_dentry) { 949 mlog_errno(-ENOMEM); 950 goto bail; 951 } 952 953 dlm_debug_get(dc); 954 return 0; 955 956 bail: 957 dlm_debug_shutdown(dlm); 958 return -ENOMEM; 959 } 960 961 void dlm_debug_shutdown(struct dlm_ctxt *dlm) 962 { 963 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt; 964 965 if (dc) { 966 debugfs_remove(dc->debug_purgelist_dentry); 967 debugfs_remove(dc->debug_mle_dentry); 968 debugfs_remove(dc->debug_lockres_dentry); 969 debugfs_remove(dc->debug_state_dentry); 970 dlm_debug_put(dc); 971 } 972 } 973 974 /* subroot - domain dir */ 975 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm) 976 { 977 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name, 978 dlm_debugfs_root); 979 if (!dlm->dlm_debugfs_subroot) { 980 mlog_errno(-ENOMEM); 981 goto bail; 982 } 983 984 dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt), 985 GFP_KERNEL); 986 if (!dlm->dlm_debug_ctxt) { 987 mlog_errno(-ENOMEM); 988 goto bail; 989 } 990 kref_init(&dlm->dlm_debug_ctxt->debug_refcnt); 991 992 return 0; 993 bail: 994 dlm_destroy_debugfs_subroot(dlm); 995 return -ENOMEM; 996 } 997 998 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm) 999 { 1000 debugfs_remove(dlm->dlm_debugfs_subroot); 1001 } 1002 1003 /* debugfs root */ 1004 int dlm_create_debugfs_root(void) 1005 { 1006 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL); 1007 if (!dlm_debugfs_root) { 1008 mlog_errno(-ENOMEM); 1009 return -ENOMEM; 1010 } 1011 return 0; 1012 } 1013 1014 void dlm_destroy_debugfs_root(void) 1015 { 1016 debugfs_remove(dlm_debugfs_root); 1017 } 1018 #endif /* CONFIG_DEBUG_FS */ 1019