1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* -*- mode: c; c-basic-offset: 8; -*- 3 * vim: noexpandtab sw=8 ts=8 sts=0: 4 * 5 * dlmdebug.c 6 * 7 * debug functionality for the dlm 8 * 9 * Copyright (C) 2004, 2008 Oracle. All rights reserved. 10 */ 11 12 #include <linux/types.h> 13 #include <linux/slab.h> 14 #include <linux/highmem.h> 15 #include <linux/sysctl.h> 16 #include <linux/spinlock.h> 17 #include <linux/debugfs.h> 18 #include <linux/export.h> 19 20 #include "../cluster/heartbeat.h" 21 #include "../cluster/nodemanager.h" 22 #include "../cluster/tcp.h" 23 24 #include "dlmapi.h" 25 #include "dlmcommon.h" 26 #include "dlmdomain.h" 27 #include "dlmdebug.h" 28 29 #define MLOG_MASK_PREFIX ML_DLM 30 #include "../cluster/masklog.h" 31 32 static int stringify_lockname(const char *lockname, int locklen, char *buf, 33 int len); 34 35 void dlm_print_one_lock_resource(struct dlm_lock_resource *res) 36 { 37 spin_lock(&res->spinlock); 38 __dlm_print_one_lock_resource(res); 39 spin_unlock(&res->spinlock); 40 } 41 42 static void dlm_print_lockres_refmap(struct dlm_lock_resource *res) 43 { 44 int bit; 45 assert_spin_locked(&res->spinlock); 46 47 printk(" refmap nodes: [ "); 48 bit = 0; 49 while (1) { 50 bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit); 51 if (bit >= O2NM_MAX_NODES) 52 break; 53 printk("%u ", bit); 54 bit++; 55 } 56 printk("], inflight=%u\n", res->inflight_locks); 57 } 58 59 static void __dlm_print_lock(struct dlm_lock *lock) 60 { 61 spin_lock(&lock->spinlock); 62 63 printk(" type=%d, conv=%d, node=%u, cookie=%u:%llu, " 64 "ref=%u, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c), " 65 "pending=(conv=%c,lock=%c,cancel=%c,unlock=%c)\n", 66 lock->ml.type, lock->ml.convert_type, lock->ml.node, 67 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), 68 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), 69 kref_read(&lock->lock_refs), 70 (list_empty(&lock->ast_list) ? 'y' : 'n'), 71 (lock->ast_pending ? 'y' : 'n'), 72 (list_empty(&lock->bast_list) ? 'y' : 'n'), 73 (lock->bast_pending ? 'y' : 'n'), 74 (lock->convert_pending ? 'y' : 'n'), 75 (lock->lock_pending ? 'y' : 'n'), 76 (lock->cancel_pending ? 'y' : 'n'), 77 (lock->unlock_pending ? 'y' : 'n')); 78 79 spin_unlock(&lock->spinlock); 80 } 81 82 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res) 83 { 84 struct dlm_lock *lock; 85 char buf[DLM_LOCKID_NAME_MAX]; 86 87 assert_spin_locked(&res->spinlock); 88 89 stringify_lockname(res->lockname.name, res->lockname.len, 90 buf, sizeof(buf)); 91 printk("lockres: %s, owner=%u, state=%u\n", 92 buf, res->owner, res->state); 93 printk(" last used: %lu, refcnt: %u, on purge list: %s\n", 94 res->last_used, kref_read(&res->refs), 95 list_empty(&res->purge) ? "no" : "yes"); 96 printk(" on dirty list: %s, on reco list: %s, " 97 "migrating pending: %s\n", 98 list_empty(&res->dirty) ? "no" : "yes", 99 list_empty(&res->recovering) ? "no" : "yes", 100 res->migration_pending ? "yes" : "no"); 101 printk(" inflight locks: %d, asts reserved: %d\n", 102 res->inflight_locks, atomic_read(&res->asts_reserved)); 103 dlm_print_lockres_refmap(res); 104 printk(" granted queue:\n"); 105 list_for_each_entry(lock, &res->granted, list) { 106 __dlm_print_lock(lock); 107 } 108 printk(" converting queue:\n"); 109 list_for_each_entry(lock, &res->converting, list) { 110 __dlm_print_lock(lock); 111 } 112 printk(" blocked queue:\n"); 113 list_for_each_entry(lock, &res->blocked, list) { 114 __dlm_print_lock(lock); 115 } 116 } 117 118 void dlm_print_one_lock(struct dlm_lock *lockid) 119 { 120 dlm_print_one_lock_resource(lockid->lockres); 121 } 122 EXPORT_SYMBOL_GPL(dlm_print_one_lock); 123 124 static const char *dlm_errnames[] = { 125 [DLM_NORMAL] = "DLM_NORMAL", 126 [DLM_GRANTED] = "DLM_GRANTED", 127 [DLM_DENIED] = "DLM_DENIED", 128 [DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS", 129 [DLM_WORKING] = "DLM_WORKING", 130 [DLM_BLOCKED] = "DLM_BLOCKED", 131 [DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN", 132 [DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD", 133 [DLM_SYSERR] = "DLM_SYSERR", 134 [DLM_NOSUPPORT] = "DLM_NOSUPPORT", 135 [DLM_CANCELGRANT] = "DLM_CANCELGRANT", 136 [DLM_IVLOCKID] = "DLM_IVLOCKID", 137 [DLM_SYNC] = "DLM_SYNC", 138 [DLM_BADTYPE] = "DLM_BADTYPE", 139 [DLM_BADRESOURCE] = "DLM_BADRESOURCE", 140 [DLM_MAXHANDLES] = "DLM_MAXHANDLES", 141 [DLM_NOCLINFO] = "DLM_NOCLINFO", 142 [DLM_NOLOCKMGR] = "DLM_NOLOCKMGR", 143 [DLM_NOPURGED] = "DLM_NOPURGED", 144 [DLM_BADARGS] = "DLM_BADARGS", 145 [DLM_VOID] = "DLM_VOID", 146 [DLM_NOTQUEUED] = "DLM_NOTQUEUED", 147 [DLM_IVBUFLEN] = "DLM_IVBUFLEN", 148 [DLM_CVTUNGRANT] = "DLM_CVTUNGRANT", 149 [DLM_BADPARAM] = "DLM_BADPARAM", 150 [DLM_VALNOTVALID] = "DLM_VALNOTVALID", 151 [DLM_REJECTED] = "DLM_REJECTED", 152 [DLM_ABORT] = "DLM_ABORT", 153 [DLM_CANCEL] = "DLM_CANCEL", 154 [DLM_IVRESHANDLE] = "DLM_IVRESHANDLE", 155 [DLM_DEADLOCK] = "DLM_DEADLOCK", 156 [DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS", 157 [DLM_FORWARD] = "DLM_FORWARD", 158 [DLM_TIMEOUT] = "DLM_TIMEOUT", 159 [DLM_IVGROUPID] = "DLM_IVGROUPID", 160 [DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT", 161 [DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH", 162 [DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION", 163 [DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ", 164 [DLM_RECOVERING] = "DLM_RECOVERING", 165 [DLM_MIGRATING] = "DLM_MIGRATING", 166 [DLM_MAXSTATS] = "DLM_MAXSTATS", 167 }; 168 169 static const char *dlm_errmsgs[] = { 170 [DLM_NORMAL] = "request in progress", 171 [DLM_GRANTED] = "request granted", 172 [DLM_DENIED] = "request denied", 173 [DLM_DENIED_NOLOCKS] = "request denied, out of system resources", 174 [DLM_WORKING] = "async request in progress", 175 [DLM_BLOCKED] = "lock request blocked", 176 [DLM_BLOCKED_ORPHAN] = "lock request blocked by a orphan lock", 177 [DLM_DENIED_GRACE_PERIOD] = "topological change in progress", 178 [DLM_SYSERR] = "system error", 179 [DLM_NOSUPPORT] = "unsupported", 180 [DLM_CANCELGRANT] = "can't cancel convert: already granted", 181 [DLM_IVLOCKID] = "bad lockid", 182 [DLM_SYNC] = "synchronous request granted", 183 [DLM_BADTYPE] = "bad resource type", 184 [DLM_BADRESOURCE] = "bad resource handle", 185 [DLM_MAXHANDLES] = "no more resource handles", 186 [DLM_NOCLINFO] = "can't contact cluster manager", 187 [DLM_NOLOCKMGR] = "can't contact lock manager", 188 [DLM_NOPURGED] = "can't contact purge daemon", 189 [DLM_BADARGS] = "bad api args", 190 [DLM_VOID] = "no status", 191 [DLM_NOTQUEUED] = "NOQUEUE was specified and request failed", 192 [DLM_IVBUFLEN] = "invalid resource name length", 193 [DLM_CVTUNGRANT] = "attempted to convert ungranted lock", 194 [DLM_BADPARAM] = "invalid lock mode specified", 195 [DLM_VALNOTVALID] = "value block has been invalidated", 196 [DLM_REJECTED] = "request rejected, unrecognized client", 197 [DLM_ABORT] = "blocked lock request cancelled", 198 [DLM_CANCEL] = "conversion request cancelled", 199 [DLM_IVRESHANDLE] = "invalid resource handle", 200 [DLM_DEADLOCK] = "deadlock recovery refused this request", 201 [DLM_DENIED_NOASTS] = "failed to allocate AST", 202 [DLM_FORWARD] = "request must wait for primary's response", 203 [DLM_TIMEOUT] = "timeout value for lock has expired", 204 [DLM_IVGROUPID] = "invalid group specification", 205 [DLM_VERS_CONFLICT] = "version conflicts prevent request handling", 206 [DLM_BAD_DEVICE_PATH] = "Locks device does not exist or path wrong", 207 [DLM_NO_DEVICE_PERMISSION] = "Client has insufficient perms for device", 208 [DLM_NO_CONTROL_DEVICE] = "Cannot set options on opened device ", 209 [DLM_RECOVERING] = "lock resource being recovered", 210 [DLM_MIGRATING] = "lock resource being migrated", 211 [DLM_MAXSTATS] = "invalid error number", 212 }; 213 214 const char *dlm_errmsg(enum dlm_status err) 215 { 216 if (err >= DLM_MAXSTATS || err < 0) 217 return dlm_errmsgs[DLM_MAXSTATS]; 218 return dlm_errmsgs[err]; 219 } 220 EXPORT_SYMBOL_GPL(dlm_errmsg); 221 222 const char *dlm_errname(enum dlm_status err) 223 { 224 if (err >= DLM_MAXSTATS || err < 0) 225 return dlm_errnames[DLM_MAXSTATS]; 226 return dlm_errnames[err]; 227 } 228 EXPORT_SYMBOL_GPL(dlm_errname); 229 230 /* NOTE: This function converts a lockname into a string. It uses knowledge 231 * of the format of the lockname that should be outside the purview of the dlm. 232 * We are adding only to make dlm debugging slightly easier. 233 * 234 * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h. 235 */ 236 static int stringify_lockname(const char *lockname, int locklen, char *buf, 237 int len) 238 { 239 int out = 0; 240 __be64 inode_blkno_be; 241 242 #define OCFS2_DENTRY_LOCK_INO_START 18 243 if (*lockname == 'N') { 244 memcpy((__be64 *)&inode_blkno_be, 245 (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START], 246 sizeof(__be64)); 247 out += scnprintf(buf + out, len - out, "%.*s%08x", 248 OCFS2_DENTRY_LOCK_INO_START - 1, lockname, 249 (unsigned int)be64_to_cpu(inode_blkno_be)); 250 } else 251 out += scnprintf(buf + out, len - out, "%.*s", 252 locklen, lockname); 253 return out; 254 } 255 256 static int stringify_nodemap(unsigned long *nodemap, int maxnodes, 257 char *buf, int len) 258 { 259 int out = 0; 260 int i = -1; 261 262 while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes) 263 out += scnprintf(buf + out, len - out, "%d ", i); 264 265 return out; 266 } 267 268 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len) 269 { 270 int out = 0; 271 char *mle_type; 272 273 if (mle->type == DLM_MLE_BLOCK) 274 mle_type = "BLK"; 275 else if (mle->type == DLM_MLE_MASTER) 276 mle_type = "MAS"; 277 else 278 mle_type = "MIG"; 279 280 out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out); 281 out += scnprintf(buf + out, len - out, 282 "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n", 283 mle_type, mle->master, mle->new_master, 284 !list_empty(&mle->hb_events), 285 !!mle->inuse, 286 kref_read(&mle->mle_refs)); 287 288 out += scnprintf(buf + out, len - out, "Maybe="); 289 out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES, 290 buf + out, len - out); 291 out += scnprintf(buf + out, len - out, "\n"); 292 293 out += scnprintf(buf + out, len - out, "Vote="); 294 out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES, 295 buf + out, len - out); 296 out += scnprintf(buf + out, len - out, "\n"); 297 298 out += scnprintf(buf + out, len - out, "Response="); 299 out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES, 300 buf + out, len - out); 301 out += scnprintf(buf + out, len - out, "\n"); 302 303 out += scnprintf(buf + out, len - out, "Node="); 304 out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES, 305 buf + out, len - out); 306 out += scnprintf(buf + out, len - out, "\n"); 307 308 out += scnprintf(buf + out, len - out, "\n"); 309 310 return out; 311 } 312 313 void dlm_print_one_mle(struct dlm_master_list_entry *mle) 314 { 315 char *buf; 316 317 buf = (char *) get_zeroed_page(GFP_ATOMIC); 318 if (buf) { 319 dump_mle(mle, buf, PAGE_SIZE - 1); 320 free_page((unsigned long)buf); 321 } 322 } 323 324 #ifdef CONFIG_DEBUG_FS 325 326 static struct dentry *dlm_debugfs_root; 327 328 #define DLM_DEBUGFS_DIR "o2dlm" 329 #define DLM_DEBUGFS_DLM_STATE "dlm_state" 330 #define DLM_DEBUGFS_LOCKING_STATE "locking_state" 331 #define DLM_DEBUGFS_MLE_STATE "mle_state" 332 #define DLM_DEBUGFS_PURGE_LIST "purge_list" 333 334 /* begin - utils funcs */ 335 static int debug_release(struct inode *inode, struct file *file) 336 { 337 free_page((unsigned long)file->private_data); 338 return 0; 339 } 340 341 static ssize_t debug_read(struct file *file, char __user *buf, 342 size_t nbytes, loff_t *ppos) 343 { 344 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, 345 i_size_read(file->f_mapping->host)); 346 } 347 /* end - util funcs */ 348 349 /* begin - purge list funcs */ 350 static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len) 351 { 352 struct dlm_lock_resource *res; 353 int out = 0; 354 unsigned long total = 0; 355 356 out += scnprintf(buf + out, len - out, 357 "Dumping Purgelist for Domain: %s\n", dlm->name); 358 359 spin_lock(&dlm->spinlock); 360 list_for_each_entry(res, &dlm->purge_list, purge) { 361 ++total; 362 if (len - out < 100) 363 continue; 364 spin_lock(&res->spinlock); 365 out += stringify_lockname(res->lockname.name, 366 res->lockname.len, 367 buf + out, len - out); 368 out += scnprintf(buf + out, len - out, "\t%ld\n", 369 (jiffies - res->last_used)/HZ); 370 spin_unlock(&res->spinlock); 371 } 372 spin_unlock(&dlm->spinlock); 373 374 out += scnprintf(buf + out, len - out, "Total on list: %lu\n", total); 375 376 return out; 377 } 378 379 static int debug_purgelist_open(struct inode *inode, struct file *file) 380 { 381 struct dlm_ctxt *dlm = inode->i_private; 382 char *buf = NULL; 383 384 buf = (char *) get_zeroed_page(GFP_NOFS); 385 if (!buf) 386 goto bail; 387 388 i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1)); 389 390 file->private_data = buf; 391 392 return 0; 393 bail: 394 return -ENOMEM; 395 } 396 397 static const struct file_operations debug_purgelist_fops = { 398 .open = debug_purgelist_open, 399 .release = debug_release, 400 .read = debug_read, 401 .llseek = generic_file_llseek, 402 }; 403 /* end - purge list funcs */ 404 405 /* begin - debug mle funcs */ 406 static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len) 407 { 408 struct dlm_master_list_entry *mle; 409 struct hlist_head *bucket; 410 int i, out = 0; 411 unsigned long total = 0, longest = 0, bucket_count = 0; 412 413 out += scnprintf(buf + out, len - out, 414 "Dumping MLEs for Domain: %s\n", dlm->name); 415 416 spin_lock(&dlm->master_lock); 417 for (i = 0; i < DLM_HASH_BUCKETS; i++) { 418 bucket = dlm_master_hash(dlm, i); 419 hlist_for_each_entry(mle, bucket, master_hash_node) { 420 ++total; 421 ++bucket_count; 422 if (len - out < 200) 423 continue; 424 out += dump_mle(mle, buf + out, len - out); 425 } 426 longest = max(longest, bucket_count); 427 bucket_count = 0; 428 } 429 spin_unlock(&dlm->master_lock); 430 431 out += scnprintf(buf + out, len - out, 432 "Total: %lu, Longest: %lu\n", total, longest); 433 return out; 434 } 435 436 static int debug_mle_open(struct inode *inode, struct file *file) 437 { 438 struct dlm_ctxt *dlm = inode->i_private; 439 char *buf = NULL; 440 441 buf = (char *) get_zeroed_page(GFP_NOFS); 442 if (!buf) 443 goto bail; 444 445 i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1)); 446 447 file->private_data = buf; 448 449 return 0; 450 bail: 451 return -ENOMEM; 452 } 453 454 static const struct file_operations debug_mle_fops = { 455 .open = debug_mle_open, 456 .release = debug_release, 457 .read = debug_read, 458 .llseek = generic_file_llseek, 459 }; 460 461 /* end - debug mle funcs */ 462 463 /* begin - debug lockres funcs */ 464 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len) 465 { 466 int out; 467 468 #define DEBUG_LOCK_VERSION 1 469 spin_lock(&lock->spinlock); 470 out = scnprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d," 471 "%d,%d,%d,%d\n", 472 DEBUG_LOCK_VERSION, 473 list_type, lock->ml.type, lock->ml.convert_type, 474 lock->ml.node, 475 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), 476 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), 477 !list_empty(&lock->ast_list), 478 !list_empty(&lock->bast_list), 479 lock->ast_pending, lock->bast_pending, 480 lock->convert_pending, lock->lock_pending, 481 lock->cancel_pending, lock->unlock_pending, 482 kref_read(&lock->lock_refs)); 483 spin_unlock(&lock->spinlock); 484 485 return out; 486 } 487 488 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len) 489 { 490 struct dlm_lock *lock; 491 int i; 492 int out = 0; 493 494 out += scnprintf(buf + out, len - out, "NAME:"); 495 out += stringify_lockname(res->lockname.name, res->lockname.len, 496 buf + out, len - out); 497 out += scnprintf(buf + out, len - out, "\n"); 498 499 #define DEBUG_LRES_VERSION 1 500 out += scnprintf(buf + out, len - out, 501 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n", 502 DEBUG_LRES_VERSION, 503 res->owner, res->state, res->last_used, 504 !list_empty(&res->purge), 505 !list_empty(&res->dirty), 506 !list_empty(&res->recovering), 507 res->inflight_locks, res->migration_pending, 508 atomic_read(&res->asts_reserved), 509 kref_read(&res->refs)); 510 511 /* refmap */ 512 out += scnprintf(buf + out, len - out, "RMAP:"); 513 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES, 514 buf + out, len - out); 515 out += scnprintf(buf + out, len - out, "\n"); 516 517 /* lvb */ 518 out += scnprintf(buf + out, len - out, "LVBX:"); 519 for (i = 0; i < DLM_LVB_LEN; i++) 520 out += scnprintf(buf + out, len - out, 521 "%02x", (unsigned char)res->lvb[i]); 522 out += scnprintf(buf + out, len - out, "\n"); 523 524 /* granted */ 525 list_for_each_entry(lock, &res->granted, list) 526 out += dump_lock(lock, 0, buf + out, len - out); 527 528 /* converting */ 529 list_for_each_entry(lock, &res->converting, list) 530 out += dump_lock(lock, 1, buf + out, len - out); 531 532 /* blocked */ 533 list_for_each_entry(lock, &res->blocked, list) 534 out += dump_lock(lock, 2, buf + out, len - out); 535 536 out += scnprintf(buf + out, len - out, "\n"); 537 538 return out; 539 } 540 541 static void *lockres_seq_start(struct seq_file *m, loff_t *pos) 542 { 543 struct debug_lockres *dl = m->private; 544 struct dlm_ctxt *dlm = dl->dl_ctxt; 545 struct dlm_lock_resource *oldres = dl->dl_res; 546 struct dlm_lock_resource *res = NULL; 547 struct list_head *track_list; 548 549 spin_lock(&dlm->track_lock); 550 if (oldres) 551 track_list = &oldres->tracking; 552 else { 553 track_list = &dlm->tracking_list; 554 if (list_empty(track_list)) { 555 dl = NULL; 556 spin_unlock(&dlm->track_lock); 557 goto bail; 558 } 559 } 560 561 list_for_each_entry(res, track_list, tracking) { 562 if (&res->tracking == &dlm->tracking_list) 563 res = NULL; 564 else 565 dlm_lockres_get(res); 566 break; 567 } 568 spin_unlock(&dlm->track_lock); 569 570 if (oldres) 571 dlm_lockres_put(oldres); 572 573 dl->dl_res = res; 574 575 if (res) { 576 spin_lock(&res->spinlock); 577 dump_lockres(res, dl->dl_buf, dl->dl_len - 1); 578 spin_unlock(&res->spinlock); 579 } else 580 dl = NULL; 581 582 bail: 583 /* passed to seq_show */ 584 return dl; 585 } 586 587 static void lockres_seq_stop(struct seq_file *m, void *v) 588 { 589 } 590 591 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos) 592 { 593 return NULL; 594 } 595 596 static int lockres_seq_show(struct seq_file *s, void *v) 597 { 598 struct debug_lockres *dl = (struct debug_lockres *)v; 599 600 seq_printf(s, "%s", dl->dl_buf); 601 602 return 0; 603 } 604 605 static const struct seq_operations debug_lockres_ops = { 606 .start = lockres_seq_start, 607 .stop = lockres_seq_stop, 608 .next = lockres_seq_next, 609 .show = lockres_seq_show, 610 }; 611 612 static int debug_lockres_open(struct inode *inode, struct file *file) 613 { 614 struct dlm_ctxt *dlm = inode->i_private; 615 struct debug_lockres *dl; 616 void *buf; 617 618 buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 619 if (!buf) 620 goto bail; 621 622 dl = __seq_open_private(file, &debug_lockres_ops, sizeof(*dl)); 623 if (!dl) 624 goto bailfree; 625 626 dl->dl_len = PAGE_SIZE; 627 dl->dl_buf = buf; 628 629 dlm_grab(dlm); 630 dl->dl_ctxt = dlm; 631 632 return 0; 633 634 bailfree: 635 kfree(buf); 636 bail: 637 mlog_errno(-ENOMEM); 638 return -ENOMEM; 639 } 640 641 static int debug_lockres_release(struct inode *inode, struct file *file) 642 { 643 struct seq_file *seq = file->private_data; 644 struct debug_lockres *dl = (struct debug_lockres *)seq->private; 645 646 if (dl->dl_res) 647 dlm_lockres_put(dl->dl_res); 648 dlm_put(dl->dl_ctxt); 649 kfree(dl->dl_buf); 650 return seq_release_private(inode, file); 651 } 652 653 static const struct file_operations debug_lockres_fops = { 654 .open = debug_lockres_open, 655 .release = debug_lockres_release, 656 .read = seq_read, 657 .llseek = seq_lseek, 658 }; 659 /* end - debug lockres funcs */ 660 661 /* begin - debug state funcs */ 662 static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len) 663 { 664 int out = 0; 665 struct dlm_reco_node_data *node; 666 char *state; 667 int cur_mles = 0, tot_mles = 0; 668 int i; 669 670 spin_lock(&dlm->spinlock); 671 672 switch (dlm->dlm_state) { 673 case DLM_CTXT_NEW: 674 state = "NEW"; break; 675 case DLM_CTXT_JOINED: 676 state = "JOINED"; break; 677 case DLM_CTXT_IN_SHUTDOWN: 678 state = "SHUTDOWN"; break; 679 case DLM_CTXT_LEAVING: 680 state = "LEAVING"; break; 681 default: 682 state = "UNKNOWN"; break; 683 } 684 685 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */ 686 out += scnprintf(buf + out, len - out, 687 "Domain: %s Key: 0x%08x Protocol: %d.%d\n", 688 dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major, 689 dlm->dlm_locking_proto.pv_minor); 690 691 /* Thread Pid: xxx Node: xxx State: xxxxx */ 692 out += scnprintf(buf + out, len - out, 693 "Thread Pid: %d Node: %d State: %s\n", 694 task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state); 695 696 /* Number of Joins: xxx Joining Node: xxx */ 697 out += scnprintf(buf + out, len - out, 698 "Number of Joins: %d Joining Node: %d\n", 699 dlm->num_joins, dlm->joining_node); 700 701 /* Domain Map: xx xx xx */ 702 out += scnprintf(buf + out, len - out, "Domain Map: "); 703 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES, 704 buf + out, len - out); 705 out += scnprintf(buf + out, len - out, "\n"); 706 707 /* Exit Domain Map: xx xx xx */ 708 out += scnprintf(buf + out, len - out, "Exit Domain Map: "); 709 out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES, 710 buf + out, len - out); 711 out += scnprintf(buf + out, len - out, "\n"); 712 713 /* Live Map: xx xx xx */ 714 out += scnprintf(buf + out, len - out, "Live Map: "); 715 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES, 716 buf + out, len - out); 717 out += scnprintf(buf + out, len - out, "\n"); 718 719 /* Lock Resources: xxx (xxx) */ 720 out += scnprintf(buf + out, len - out, 721 "Lock Resources: %d (%d)\n", 722 atomic_read(&dlm->res_cur_count), 723 atomic_read(&dlm->res_tot_count)); 724 725 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) 726 tot_mles += atomic_read(&dlm->mle_tot_count[i]); 727 728 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) 729 cur_mles += atomic_read(&dlm->mle_cur_count[i]); 730 731 /* MLEs: xxx (xxx) */ 732 out += scnprintf(buf + out, len - out, 733 "MLEs: %d (%d)\n", cur_mles, tot_mles); 734 735 /* Blocking: xxx (xxx) */ 736 out += scnprintf(buf + out, len - out, 737 " Blocking: %d (%d)\n", 738 atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]), 739 atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK])); 740 741 /* Mastery: xxx (xxx) */ 742 out += scnprintf(buf + out, len - out, 743 " Mastery: %d (%d)\n", 744 atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]), 745 atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER])); 746 747 /* Migration: xxx (xxx) */ 748 out += scnprintf(buf + out, len - out, 749 " Migration: %d (%d)\n", 750 atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]), 751 atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION])); 752 753 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */ 754 out += scnprintf(buf + out, len - out, 755 "Lists: Dirty=%s Purge=%s PendingASTs=%s " 756 "PendingBASTs=%s\n", 757 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"), 758 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"), 759 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"), 760 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse")); 761 762 /* Purge Count: xxx Refs: xxx */ 763 out += scnprintf(buf + out, len - out, 764 "Purge Count: %d Refs: %d\n", dlm->purge_count, 765 kref_read(&dlm->dlm_refs)); 766 767 /* Dead Node: xxx */ 768 out += scnprintf(buf + out, len - out, 769 "Dead Node: %d\n", dlm->reco.dead_node); 770 771 /* What about DLM_RECO_STATE_FINALIZE? */ 772 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE) 773 state = "ACTIVE"; 774 else 775 state = "INACTIVE"; 776 777 /* Recovery Pid: xxxx Master: xxx State: xxxx */ 778 out += scnprintf(buf + out, len - out, 779 "Recovery Pid: %d Master: %d State: %s\n", 780 task_pid_nr(dlm->dlm_reco_thread_task), 781 dlm->reco.new_master, state); 782 783 /* Recovery Map: xx xx */ 784 out += scnprintf(buf + out, len - out, "Recovery Map: "); 785 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES, 786 buf + out, len - out); 787 out += scnprintf(buf + out, len - out, "\n"); 788 789 /* Recovery Node State: */ 790 out += scnprintf(buf + out, len - out, "Recovery Node State:\n"); 791 list_for_each_entry(node, &dlm->reco.node_data, list) { 792 switch (node->state) { 793 case DLM_RECO_NODE_DATA_INIT: 794 state = "INIT"; 795 break; 796 case DLM_RECO_NODE_DATA_REQUESTING: 797 state = "REQUESTING"; 798 break; 799 case DLM_RECO_NODE_DATA_DEAD: 800 state = "DEAD"; 801 break; 802 case DLM_RECO_NODE_DATA_RECEIVING: 803 state = "RECEIVING"; 804 break; 805 case DLM_RECO_NODE_DATA_REQUESTED: 806 state = "REQUESTED"; 807 break; 808 case DLM_RECO_NODE_DATA_DONE: 809 state = "DONE"; 810 break; 811 case DLM_RECO_NODE_DATA_FINALIZE_SENT: 812 state = "FINALIZE-SENT"; 813 break; 814 default: 815 state = "BAD"; 816 break; 817 } 818 out += scnprintf(buf + out, len - out, "\t%u - %s\n", 819 node->node_num, state); 820 } 821 822 spin_unlock(&dlm->spinlock); 823 824 return out; 825 } 826 827 static int debug_state_open(struct inode *inode, struct file *file) 828 { 829 struct dlm_ctxt *dlm = inode->i_private; 830 char *buf = NULL; 831 832 buf = (char *) get_zeroed_page(GFP_NOFS); 833 if (!buf) 834 goto bail; 835 836 i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1)); 837 838 file->private_data = buf; 839 840 return 0; 841 bail: 842 return -ENOMEM; 843 } 844 845 static const struct file_operations debug_state_fops = { 846 .open = debug_state_open, 847 .release = debug_release, 848 .read = debug_read, 849 .llseek = generic_file_llseek, 850 }; 851 /* end - debug state funcs */ 852 853 /* files in subroot */ 854 void dlm_debug_init(struct dlm_ctxt *dlm) 855 { 856 /* for dumping dlm_ctxt */ 857 debugfs_create_file(DLM_DEBUGFS_DLM_STATE, S_IFREG|S_IRUSR, 858 dlm->dlm_debugfs_subroot, dlm, &debug_state_fops); 859 860 /* for dumping lockres */ 861 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE, S_IFREG|S_IRUSR, 862 dlm->dlm_debugfs_subroot, dlm, &debug_lockres_fops); 863 864 /* for dumping mles */ 865 debugfs_create_file(DLM_DEBUGFS_MLE_STATE, S_IFREG|S_IRUSR, 866 dlm->dlm_debugfs_subroot, dlm, &debug_mle_fops); 867 868 /* for dumping lockres on the purge list */ 869 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST, S_IFREG|S_IRUSR, 870 dlm->dlm_debugfs_subroot, dlm, 871 &debug_purgelist_fops); 872 } 873 874 /* subroot - domain dir */ 875 void dlm_create_debugfs_subroot(struct dlm_ctxt *dlm) 876 { 877 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name, 878 dlm_debugfs_root); 879 } 880 881 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm) 882 { 883 debugfs_remove_recursive(dlm->dlm_debugfs_subroot); 884 } 885 886 /* debugfs root */ 887 void dlm_create_debugfs_root(void) 888 { 889 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL); 890 } 891 892 void dlm_destroy_debugfs_root(void) 893 { 894 debugfs_remove(dlm_debugfs_root); 895 } 896 #endif /* CONFIG_DEBUG_FS */ 897