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 dlm_lock *lock; 100 char buf[DLM_LOCKID_NAME_MAX]; 101 102 assert_spin_locked(&res->spinlock); 103 104 stringify_lockname(res->lockname.name, res->lockname.len, 105 buf, sizeof(buf)); 106 printk("lockres: %s, owner=%u, state=%u\n", 107 buf, res->owner, res->state); 108 printk(" last used: %lu, refcnt: %u, on purge list: %s\n", 109 res->last_used, atomic_read(&res->refs.refcount), 110 list_empty(&res->purge) ? "no" : "yes"); 111 printk(" on dirty list: %s, on reco list: %s, " 112 "migrating pending: %s\n", 113 list_empty(&res->dirty) ? "no" : "yes", 114 list_empty(&res->recovering) ? "no" : "yes", 115 res->migration_pending ? "yes" : "no"); 116 printk(" inflight locks: %d, asts reserved: %d\n", 117 res->inflight_locks, atomic_read(&res->asts_reserved)); 118 dlm_print_lockres_refmap(res); 119 printk(" granted queue:\n"); 120 list_for_each_entry(lock, &res->granted, list) { 121 __dlm_print_lock(lock); 122 } 123 printk(" converting queue:\n"); 124 list_for_each_entry(lock, &res->converting, list) { 125 __dlm_print_lock(lock); 126 } 127 printk(" blocked queue:\n"); 128 list_for_each_entry(lock, &res->blocked, list) { 129 __dlm_print_lock(lock); 130 } 131 } 132 133 void dlm_print_one_lock(struct dlm_lock *lockid) 134 { 135 dlm_print_one_lock_resource(lockid->lockres); 136 } 137 EXPORT_SYMBOL_GPL(dlm_print_one_lock); 138 139 static const char *dlm_errnames[] = { 140 [DLM_NORMAL] = "DLM_NORMAL", 141 [DLM_GRANTED] = "DLM_GRANTED", 142 [DLM_DENIED] = "DLM_DENIED", 143 [DLM_DENIED_NOLOCKS] = "DLM_DENIED_NOLOCKS", 144 [DLM_WORKING] = "DLM_WORKING", 145 [DLM_BLOCKED] = "DLM_BLOCKED", 146 [DLM_BLOCKED_ORPHAN] = "DLM_BLOCKED_ORPHAN", 147 [DLM_DENIED_GRACE_PERIOD] = "DLM_DENIED_GRACE_PERIOD", 148 [DLM_SYSERR] = "DLM_SYSERR", 149 [DLM_NOSUPPORT] = "DLM_NOSUPPORT", 150 [DLM_CANCELGRANT] = "DLM_CANCELGRANT", 151 [DLM_IVLOCKID] = "DLM_IVLOCKID", 152 [DLM_SYNC] = "DLM_SYNC", 153 [DLM_BADTYPE] = "DLM_BADTYPE", 154 [DLM_BADRESOURCE] = "DLM_BADRESOURCE", 155 [DLM_MAXHANDLES] = "DLM_MAXHANDLES", 156 [DLM_NOCLINFO] = "DLM_NOCLINFO", 157 [DLM_NOLOCKMGR] = "DLM_NOLOCKMGR", 158 [DLM_NOPURGED] = "DLM_NOPURGED", 159 [DLM_BADARGS] = "DLM_BADARGS", 160 [DLM_VOID] = "DLM_VOID", 161 [DLM_NOTQUEUED] = "DLM_NOTQUEUED", 162 [DLM_IVBUFLEN] = "DLM_IVBUFLEN", 163 [DLM_CVTUNGRANT] = "DLM_CVTUNGRANT", 164 [DLM_BADPARAM] = "DLM_BADPARAM", 165 [DLM_VALNOTVALID] = "DLM_VALNOTVALID", 166 [DLM_REJECTED] = "DLM_REJECTED", 167 [DLM_ABORT] = "DLM_ABORT", 168 [DLM_CANCEL] = "DLM_CANCEL", 169 [DLM_IVRESHANDLE] = "DLM_IVRESHANDLE", 170 [DLM_DEADLOCK] = "DLM_DEADLOCK", 171 [DLM_DENIED_NOASTS] = "DLM_DENIED_NOASTS", 172 [DLM_FORWARD] = "DLM_FORWARD", 173 [DLM_TIMEOUT] = "DLM_TIMEOUT", 174 [DLM_IVGROUPID] = "DLM_IVGROUPID", 175 [DLM_VERS_CONFLICT] = "DLM_VERS_CONFLICT", 176 [DLM_BAD_DEVICE_PATH] = "DLM_BAD_DEVICE_PATH", 177 [DLM_NO_DEVICE_PERMISSION] = "DLM_NO_DEVICE_PERMISSION", 178 [DLM_NO_CONTROL_DEVICE ] = "DLM_NO_CONTROL_DEVICE ", 179 [DLM_RECOVERING] = "DLM_RECOVERING", 180 [DLM_MIGRATING] = "DLM_MIGRATING", 181 [DLM_MAXSTATS] = "DLM_MAXSTATS", 182 }; 183 184 static const char *dlm_errmsgs[] = { 185 [DLM_NORMAL] = "request in progress", 186 [DLM_GRANTED] = "request granted", 187 [DLM_DENIED] = "request denied", 188 [DLM_DENIED_NOLOCKS] = "request denied, out of system resources", 189 [DLM_WORKING] = "async request in progress", 190 [DLM_BLOCKED] = "lock request blocked", 191 [DLM_BLOCKED_ORPHAN] = "lock request blocked by a orphan lock", 192 [DLM_DENIED_GRACE_PERIOD] = "topological change in progress", 193 [DLM_SYSERR] = "system error", 194 [DLM_NOSUPPORT] = "unsupported", 195 [DLM_CANCELGRANT] = "can't cancel convert: already granted", 196 [DLM_IVLOCKID] = "bad lockid", 197 [DLM_SYNC] = "synchronous request granted", 198 [DLM_BADTYPE] = "bad resource type", 199 [DLM_BADRESOURCE] = "bad resource handle", 200 [DLM_MAXHANDLES] = "no more resource handles", 201 [DLM_NOCLINFO] = "can't contact cluster manager", 202 [DLM_NOLOCKMGR] = "can't contact lock manager", 203 [DLM_NOPURGED] = "can't contact purge daemon", 204 [DLM_BADARGS] = "bad api args", 205 [DLM_VOID] = "no status", 206 [DLM_NOTQUEUED] = "NOQUEUE was specified and request failed", 207 [DLM_IVBUFLEN] = "invalid resource name length", 208 [DLM_CVTUNGRANT] = "attempted to convert ungranted lock", 209 [DLM_BADPARAM] = "invalid lock mode specified", 210 [DLM_VALNOTVALID] = "value block has been invalidated", 211 [DLM_REJECTED] = "request rejected, unrecognized client", 212 [DLM_ABORT] = "blocked lock request cancelled", 213 [DLM_CANCEL] = "conversion request cancelled", 214 [DLM_IVRESHANDLE] = "invalid resource handle", 215 [DLM_DEADLOCK] = "deadlock recovery refused this request", 216 [DLM_DENIED_NOASTS] = "failed to allocate AST", 217 [DLM_FORWARD] = "request must wait for primary's response", 218 [DLM_TIMEOUT] = "timeout value for lock has expired", 219 [DLM_IVGROUPID] = "invalid group specification", 220 [DLM_VERS_CONFLICT] = "version conflicts prevent request handling", 221 [DLM_BAD_DEVICE_PATH] = "Locks device does not exist or path wrong", 222 [DLM_NO_DEVICE_PERMISSION] = "Client has insufficient perms for device", 223 [DLM_NO_CONTROL_DEVICE] = "Cannot set options on opened device ", 224 [DLM_RECOVERING] = "lock resource being recovered", 225 [DLM_MIGRATING] = "lock resource being migrated", 226 [DLM_MAXSTATS] = "invalid error number", 227 }; 228 229 const char *dlm_errmsg(enum dlm_status err) 230 { 231 if (err >= DLM_MAXSTATS || err < 0) 232 return dlm_errmsgs[DLM_MAXSTATS]; 233 return dlm_errmsgs[err]; 234 } 235 EXPORT_SYMBOL_GPL(dlm_errmsg); 236 237 const char *dlm_errname(enum dlm_status err) 238 { 239 if (err >= DLM_MAXSTATS || err < 0) 240 return dlm_errnames[DLM_MAXSTATS]; 241 return dlm_errnames[err]; 242 } 243 EXPORT_SYMBOL_GPL(dlm_errname); 244 245 /* NOTE: This function converts a lockname into a string. It uses knowledge 246 * of the format of the lockname that should be outside the purview of the dlm. 247 * We are adding only to make dlm debugging slightly easier. 248 * 249 * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h. 250 */ 251 static int stringify_lockname(const char *lockname, int locklen, char *buf, 252 int len) 253 { 254 int out = 0; 255 __be64 inode_blkno_be; 256 257 #define OCFS2_DENTRY_LOCK_INO_START 18 258 if (*lockname == 'N') { 259 memcpy((__be64 *)&inode_blkno_be, 260 (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START], 261 sizeof(__be64)); 262 out += snprintf(buf + out, len - out, "%.*s%08x", 263 OCFS2_DENTRY_LOCK_INO_START - 1, lockname, 264 (unsigned int)be64_to_cpu(inode_blkno_be)); 265 } else 266 out += snprintf(buf + out, len - out, "%.*s", 267 locklen, lockname); 268 return out; 269 } 270 271 static int stringify_nodemap(unsigned long *nodemap, int maxnodes, 272 char *buf, int len) 273 { 274 int out = 0; 275 int i = -1; 276 277 while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes) 278 out += snprintf(buf + out, len - out, "%d ", i); 279 280 return out; 281 } 282 283 static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len) 284 { 285 int out = 0; 286 char *mle_type; 287 288 if (mle->type == DLM_MLE_BLOCK) 289 mle_type = "BLK"; 290 else if (mle->type == DLM_MLE_MASTER) 291 mle_type = "MAS"; 292 else 293 mle_type = "MIG"; 294 295 out += stringify_lockname(mle->mname, mle->mnamelen, buf + out, len - out); 296 out += snprintf(buf + out, len - out, 297 "\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n", 298 mle_type, mle->master, mle->new_master, 299 !list_empty(&mle->hb_events), 300 !!mle->inuse, 301 atomic_read(&mle->mle_refs.refcount)); 302 303 out += snprintf(buf + out, len - out, "Maybe="); 304 out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES, 305 buf + out, len - out); 306 out += snprintf(buf + out, len - out, "\n"); 307 308 out += snprintf(buf + out, len - out, "Vote="); 309 out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES, 310 buf + out, len - out); 311 out += snprintf(buf + out, len - out, "\n"); 312 313 out += snprintf(buf + out, len - out, "Response="); 314 out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES, 315 buf + out, len - out); 316 out += snprintf(buf + out, len - out, "\n"); 317 318 out += snprintf(buf + out, len - out, "Node="); 319 out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES, 320 buf + out, len - out); 321 out += snprintf(buf + out, len - out, "\n"); 322 323 out += snprintf(buf + out, len - out, "\n"); 324 325 return out; 326 } 327 328 void dlm_print_one_mle(struct dlm_master_list_entry *mle) 329 { 330 char *buf; 331 332 buf = (char *) get_zeroed_page(GFP_NOFS); 333 if (buf) { 334 dump_mle(mle, buf, PAGE_SIZE - 1); 335 free_page((unsigned long)buf); 336 } 337 } 338 339 #ifdef CONFIG_DEBUG_FS 340 341 static struct dentry *dlm_debugfs_root; 342 343 #define DLM_DEBUGFS_DIR "o2dlm" 344 #define DLM_DEBUGFS_DLM_STATE "dlm_state" 345 #define DLM_DEBUGFS_LOCKING_STATE "locking_state" 346 #define DLM_DEBUGFS_MLE_STATE "mle_state" 347 #define DLM_DEBUGFS_PURGE_LIST "purge_list" 348 349 /* begin - utils funcs */ 350 static void dlm_debug_free(struct kref *kref) 351 { 352 struct dlm_debug_ctxt *dc; 353 354 dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt); 355 356 kfree(dc); 357 } 358 359 static void dlm_debug_put(struct dlm_debug_ctxt *dc) 360 { 361 if (dc) 362 kref_put(&dc->debug_refcnt, dlm_debug_free); 363 } 364 365 static void dlm_debug_get(struct dlm_debug_ctxt *dc) 366 { 367 kref_get(&dc->debug_refcnt); 368 } 369 370 static int debug_release(struct inode *inode, struct file *file) 371 { 372 free_page((unsigned long)file->private_data); 373 return 0; 374 } 375 376 static ssize_t debug_read(struct file *file, char __user *buf, 377 size_t nbytes, loff_t *ppos) 378 { 379 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, 380 i_size_read(file->f_mapping->host)); 381 } 382 /* end - util funcs */ 383 384 /* begin - purge list funcs */ 385 static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len) 386 { 387 struct dlm_lock_resource *res; 388 int out = 0; 389 unsigned long total = 0; 390 391 out += snprintf(buf + out, len - out, 392 "Dumping Purgelist for Domain: %s\n", dlm->name); 393 394 spin_lock(&dlm->spinlock); 395 list_for_each_entry(res, &dlm->purge_list, purge) { 396 ++total; 397 if (len - out < 100) 398 continue; 399 spin_lock(&res->spinlock); 400 out += stringify_lockname(res->lockname.name, 401 res->lockname.len, 402 buf + out, len - out); 403 out += snprintf(buf + out, len - out, "\t%ld\n", 404 (jiffies - res->last_used)/HZ); 405 spin_unlock(&res->spinlock); 406 } 407 spin_unlock(&dlm->spinlock); 408 409 out += snprintf(buf + out, len - out, "Total on list: %lu\n", total); 410 411 return out; 412 } 413 414 static int debug_purgelist_open(struct inode *inode, struct file *file) 415 { 416 struct dlm_ctxt *dlm = inode->i_private; 417 char *buf = NULL; 418 419 buf = (char *) get_zeroed_page(GFP_NOFS); 420 if (!buf) 421 goto bail; 422 423 i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1)); 424 425 file->private_data = buf; 426 427 return 0; 428 bail: 429 return -ENOMEM; 430 } 431 432 static const struct file_operations debug_purgelist_fops = { 433 .open = debug_purgelist_open, 434 .release = debug_release, 435 .read = debug_read, 436 .llseek = generic_file_llseek, 437 }; 438 /* end - purge list funcs */ 439 440 /* begin - debug mle funcs */ 441 static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len) 442 { 443 struct dlm_master_list_entry *mle; 444 struct hlist_head *bucket; 445 int i, out = 0; 446 unsigned long total = 0, longest = 0, bucket_count = 0; 447 448 out += snprintf(buf + out, len - out, 449 "Dumping MLEs for Domain: %s\n", dlm->name); 450 451 spin_lock(&dlm->master_lock); 452 for (i = 0; i < DLM_HASH_BUCKETS; i++) { 453 bucket = dlm_master_hash(dlm, i); 454 hlist_for_each_entry(mle, bucket, master_hash_node) { 455 ++total; 456 ++bucket_count; 457 if (len - out < 200) 458 continue; 459 out += dump_mle(mle, buf + out, len - out); 460 } 461 longest = max(longest, bucket_count); 462 bucket_count = 0; 463 } 464 spin_unlock(&dlm->master_lock); 465 466 out += snprintf(buf + out, len - out, 467 "Total: %lu, Longest: %lu\n", total, longest); 468 return out; 469 } 470 471 static int debug_mle_open(struct inode *inode, struct file *file) 472 { 473 struct dlm_ctxt *dlm = inode->i_private; 474 char *buf = NULL; 475 476 buf = (char *) get_zeroed_page(GFP_NOFS); 477 if (!buf) 478 goto bail; 479 480 i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1)); 481 482 file->private_data = buf; 483 484 return 0; 485 bail: 486 return -ENOMEM; 487 } 488 489 static const struct file_operations debug_mle_fops = { 490 .open = debug_mle_open, 491 .release = debug_release, 492 .read = debug_read, 493 .llseek = generic_file_llseek, 494 }; 495 496 /* end - debug mle funcs */ 497 498 /* begin - debug lockres funcs */ 499 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len) 500 { 501 int out; 502 503 #define DEBUG_LOCK_VERSION 1 504 spin_lock(&lock->spinlock); 505 out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d," 506 "%d,%d,%d,%d\n", 507 DEBUG_LOCK_VERSION, 508 list_type, lock->ml.type, lock->ml.convert_type, 509 lock->ml.node, 510 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), 511 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), 512 !list_empty(&lock->ast_list), 513 !list_empty(&lock->bast_list), 514 lock->ast_pending, lock->bast_pending, 515 lock->convert_pending, lock->lock_pending, 516 lock->cancel_pending, lock->unlock_pending, 517 atomic_read(&lock->lock_refs.refcount)); 518 spin_unlock(&lock->spinlock); 519 520 return out; 521 } 522 523 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len) 524 { 525 struct dlm_lock *lock; 526 int i; 527 int out = 0; 528 529 out += snprintf(buf + out, len - out, "NAME:"); 530 out += stringify_lockname(res->lockname.name, res->lockname.len, 531 buf + out, len - out); 532 out += snprintf(buf + out, len - out, "\n"); 533 534 #define DEBUG_LRES_VERSION 1 535 out += snprintf(buf + out, len - out, 536 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n", 537 DEBUG_LRES_VERSION, 538 res->owner, res->state, res->last_used, 539 !list_empty(&res->purge), 540 !list_empty(&res->dirty), 541 !list_empty(&res->recovering), 542 res->inflight_locks, res->migration_pending, 543 atomic_read(&res->asts_reserved), 544 atomic_read(&res->refs.refcount)); 545 546 /* refmap */ 547 out += snprintf(buf + out, len - out, "RMAP:"); 548 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES, 549 buf + out, len - out); 550 out += snprintf(buf + out, len - out, "\n"); 551 552 /* lvb */ 553 out += snprintf(buf + out, len - out, "LVBX:"); 554 for (i = 0; i < DLM_LVB_LEN; i++) 555 out += snprintf(buf + out, len - out, 556 "%02x", (unsigned char)res->lvb[i]); 557 out += snprintf(buf + out, len - out, "\n"); 558 559 /* granted */ 560 list_for_each_entry(lock, &res->granted, list) 561 out += dump_lock(lock, 0, buf + out, len - out); 562 563 /* converting */ 564 list_for_each_entry(lock, &res->converting, list) 565 out += dump_lock(lock, 1, buf + out, len - out); 566 567 /* blocked */ 568 list_for_each_entry(lock, &res->blocked, list) 569 out += dump_lock(lock, 2, buf + out, len - out); 570 571 out += snprintf(buf + out, len - out, "\n"); 572 573 return out; 574 } 575 576 static void *lockres_seq_start(struct seq_file *m, loff_t *pos) 577 { 578 struct debug_lockres *dl = m->private; 579 struct dlm_ctxt *dlm = dl->dl_ctxt; 580 struct dlm_lock_resource *oldres = dl->dl_res; 581 struct dlm_lock_resource *res = NULL; 582 struct list_head *track_list; 583 584 spin_lock(&dlm->track_lock); 585 if (oldres) 586 track_list = &oldres->tracking; 587 else { 588 track_list = &dlm->tracking_list; 589 if (list_empty(track_list)) { 590 dl = NULL; 591 spin_unlock(&dlm->track_lock); 592 goto bail; 593 } 594 } 595 596 list_for_each_entry(res, track_list, tracking) { 597 if (&res->tracking == &dlm->tracking_list) 598 res = NULL; 599 else 600 dlm_lockres_get(res); 601 break; 602 } 603 spin_unlock(&dlm->track_lock); 604 605 if (oldres) 606 dlm_lockres_put(oldres); 607 608 dl->dl_res = res; 609 610 if (res) { 611 spin_lock(&res->spinlock); 612 dump_lockres(res, dl->dl_buf, dl->dl_len - 1); 613 spin_unlock(&res->spinlock); 614 } else 615 dl = NULL; 616 617 bail: 618 /* passed to seq_show */ 619 return dl; 620 } 621 622 static void lockres_seq_stop(struct seq_file *m, void *v) 623 { 624 } 625 626 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos) 627 { 628 return NULL; 629 } 630 631 static int lockres_seq_show(struct seq_file *s, void *v) 632 { 633 struct debug_lockres *dl = (struct debug_lockres *)v; 634 635 seq_printf(s, "%s", dl->dl_buf); 636 637 return 0; 638 } 639 640 static const struct seq_operations debug_lockres_ops = { 641 .start = lockres_seq_start, 642 .stop = lockres_seq_stop, 643 .next = lockres_seq_next, 644 .show = lockres_seq_show, 645 }; 646 647 static int debug_lockres_open(struct inode *inode, struct file *file) 648 { 649 struct dlm_ctxt *dlm = inode->i_private; 650 struct debug_lockres *dl; 651 void *buf; 652 653 buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 654 if (!buf) 655 goto bail; 656 657 dl = __seq_open_private(file, &debug_lockres_ops, sizeof(*dl)); 658 if (!dl) 659 goto bailfree; 660 661 dl->dl_len = PAGE_SIZE; 662 dl->dl_buf = buf; 663 664 dlm_grab(dlm); 665 dl->dl_ctxt = dlm; 666 667 return 0; 668 669 bailfree: 670 kfree(buf); 671 bail: 672 mlog_errno(-ENOMEM); 673 return -ENOMEM; 674 } 675 676 static int debug_lockres_release(struct inode *inode, struct file *file) 677 { 678 struct seq_file *seq = file->private_data; 679 struct debug_lockres *dl = (struct debug_lockres *)seq->private; 680 681 if (dl->dl_res) 682 dlm_lockres_put(dl->dl_res); 683 dlm_put(dl->dl_ctxt); 684 kfree(dl->dl_buf); 685 return seq_release_private(inode, file); 686 } 687 688 static const struct file_operations debug_lockres_fops = { 689 .open = debug_lockres_open, 690 .release = debug_lockres_release, 691 .read = seq_read, 692 .llseek = seq_lseek, 693 }; 694 /* end - debug lockres funcs */ 695 696 /* begin - debug state funcs */ 697 static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len) 698 { 699 int out = 0; 700 struct dlm_reco_node_data *node; 701 char *state; 702 int cur_mles = 0, tot_mles = 0; 703 int i; 704 705 spin_lock(&dlm->spinlock); 706 707 switch (dlm->dlm_state) { 708 case DLM_CTXT_NEW: 709 state = "NEW"; break; 710 case DLM_CTXT_JOINED: 711 state = "JOINED"; break; 712 case DLM_CTXT_IN_SHUTDOWN: 713 state = "SHUTDOWN"; break; 714 case DLM_CTXT_LEAVING: 715 state = "LEAVING"; break; 716 default: 717 state = "UNKNOWN"; break; 718 } 719 720 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */ 721 out += snprintf(buf + out, len - out, 722 "Domain: %s Key: 0x%08x Protocol: %d.%d\n", 723 dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major, 724 dlm->dlm_locking_proto.pv_minor); 725 726 /* Thread Pid: xxx Node: xxx State: xxxxx */ 727 out += snprintf(buf + out, len - out, 728 "Thread Pid: %d Node: %d State: %s\n", 729 task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state); 730 731 /* Number of Joins: xxx Joining Node: xxx */ 732 out += snprintf(buf + out, len - out, 733 "Number of Joins: %d Joining Node: %d\n", 734 dlm->num_joins, dlm->joining_node); 735 736 /* Domain Map: xx xx xx */ 737 out += snprintf(buf + out, len - out, "Domain Map: "); 738 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES, 739 buf + out, len - out); 740 out += snprintf(buf + out, len - out, "\n"); 741 742 /* Exit Domain Map: xx xx xx */ 743 out += snprintf(buf + out, len - out, "Exit Domain Map: "); 744 out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES, 745 buf + out, len - out); 746 out += snprintf(buf + out, len - out, "\n"); 747 748 /* Live Map: xx xx xx */ 749 out += snprintf(buf + out, len - out, "Live Map: "); 750 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES, 751 buf + out, len - out); 752 out += snprintf(buf + out, len - out, "\n"); 753 754 /* Lock Resources: xxx (xxx) */ 755 out += snprintf(buf + out, len - out, 756 "Lock Resources: %d (%d)\n", 757 atomic_read(&dlm->res_cur_count), 758 atomic_read(&dlm->res_tot_count)); 759 760 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) 761 tot_mles += atomic_read(&dlm->mle_tot_count[i]); 762 763 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) 764 cur_mles += atomic_read(&dlm->mle_cur_count[i]); 765 766 /* MLEs: xxx (xxx) */ 767 out += snprintf(buf + out, len - out, 768 "MLEs: %d (%d)\n", cur_mles, tot_mles); 769 770 /* Blocking: xxx (xxx) */ 771 out += snprintf(buf + out, len - out, 772 " Blocking: %d (%d)\n", 773 atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]), 774 atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK])); 775 776 /* Mastery: xxx (xxx) */ 777 out += snprintf(buf + out, len - out, 778 " Mastery: %d (%d)\n", 779 atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]), 780 atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER])); 781 782 /* Migration: xxx (xxx) */ 783 out += snprintf(buf + out, len - out, 784 " Migration: %d (%d)\n", 785 atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]), 786 atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION])); 787 788 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */ 789 out += snprintf(buf + out, len - out, 790 "Lists: Dirty=%s Purge=%s PendingASTs=%s " 791 "PendingBASTs=%s\n", 792 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"), 793 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"), 794 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"), 795 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse")); 796 797 /* Purge Count: xxx Refs: xxx */ 798 out += snprintf(buf + out, len - out, 799 "Purge Count: %d Refs: %d\n", dlm->purge_count, 800 atomic_read(&dlm->dlm_refs.refcount)); 801 802 /* Dead Node: xxx */ 803 out += snprintf(buf + out, len - out, 804 "Dead Node: %d\n", dlm->reco.dead_node); 805 806 /* What about DLM_RECO_STATE_FINALIZE? */ 807 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE) 808 state = "ACTIVE"; 809 else 810 state = "INACTIVE"; 811 812 /* Recovery Pid: xxxx Master: xxx State: xxxx */ 813 out += snprintf(buf + out, len - out, 814 "Recovery Pid: %d Master: %d State: %s\n", 815 task_pid_nr(dlm->dlm_reco_thread_task), 816 dlm->reco.new_master, state); 817 818 /* Recovery Map: xx xx */ 819 out += snprintf(buf + out, len - out, "Recovery Map: "); 820 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES, 821 buf + out, len - out); 822 out += snprintf(buf + out, len - out, "\n"); 823 824 /* Recovery Node State: */ 825 out += snprintf(buf + out, len - out, "Recovery Node State:\n"); 826 list_for_each_entry(node, &dlm->reco.node_data, list) { 827 switch (node->state) { 828 case DLM_RECO_NODE_DATA_INIT: 829 state = "INIT"; 830 break; 831 case DLM_RECO_NODE_DATA_REQUESTING: 832 state = "REQUESTING"; 833 break; 834 case DLM_RECO_NODE_DATA_DEAD: 835 state = "DEAD"; 836 break; 837 case DLM_RECO_NODE_DATA_RECEIVING: 838 state = "RECEIVING"; 839 break; 840 case DLM_RECO_NODE_DATA_REQUESTED: 841 state = "REQUESTED"; 842 break; 843 case DLM_RECO_NODE_DATA_DONE: 844 state = "DONE"; 845 break; 846 case DLM_RECO_NODE_DATA_FINALIZE_SENT: 847 state = "FINALIZE-SENT"; 848 break; 849 default: 850 state = "BAD"; 851 break; 852 } 853 out += snprintf(buf + out, len - out, "\t%u - %s\n", 854 node->node_num, state); 855 } 856 857 spin_unlock(&dlm->spinlock); 858 859 return out; 860 } 861 862 static int debug_state_open(struct inode *inode, struct file *file) 863 { 864 struct dlm_ctxt *dlm = inode->i_private; 865 char *buf = NULL; 866 867 buf = (char *) get_zeroed_page(GFP_NOFS); 868 if (!buf) 869 goto bail; 870 871 i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1)); 872 873 file->private_data = buf; 874 875 return 0; 876 bail: 877 return -ENOMEM; 878 } 879 880 static const struct file_operations debug_state_fops = { 881 .open = debug_state_open, 882 .release = debug_release, 883 .read = debug_read, 884 .llseek = generic_file_llseek, 885 }; 886 /* end - debug state funcs */ 887 888 /* files in subroot */ 889 int dlm_debug_init(struct dlm_ctxt *dlm) 890 { 891 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt; 892 893 /* for dumping dlm_ctxt */ 894 dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE, 895 S_IFREG|S_IRUSR, 896 dlm->dlm_debugfs_subroot, 897 dlm, &debug_state_fops); 898 if (!dc->debug_state_dentry) { 899 mlog_errno(-ENOMEM); 900 goto bail; 901 } 902 903 /* for dumping lockres */ 904 dc->debug_lockres_dentry = 905 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE, 906 S_IFREG|S_IRUSR, 907 dlm->dlm_debugfs_subroot, 908 dlm, &debug_lockres_fops); 909 if (!dc->debug_lockres_dentry) { 910 mlog_errno(-ENOMEM); 911 goto bail; 912 } 913 914 /* for dumping mles */ 915 dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE, 916 S_IFREG|S_IRUSR, 917 dlm->dlm_debugfs_subroot, 918 dlm, &debug_mle_fops); 919 if (!dc->debug_mle_dentry) { 920 mlog_errno(-ENOMEM); 921 goto bail; 922 } 923 924 /* for dumping lockres on the purge list */ 925 dc->debug_purgelist_dentry = 926 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST, 927 S_IFREG|S_IRUSR, 928 dlm->dlm_debugfs_subroot, 929 dlm, &debug_purgelist_fops); 930 if (!dc->debug_purgelist_dentry) { 931 mlog_errno(-ENOMEM); 932 goto bail; 933 } 934 935 dlm_debug_get(dc); 936 return 0; 937 938 bail: 939 dlm_debug_shutdown(dlm); 940 return -ENOMEM; 941 } 942 943 void dlm_debug_shutdown(struct dlm_ctxt *dlm) 944 { 945 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt; 946 947 if (dc) { 948 debugfs_remove(dc->debug_purgelist_dentry); 949 debugfs_remove(dc->debug_mle_dentry); 950 debugfs_remove(dc->debug_lockres_dentry); 951 debugfs_remove(dc->debug_state_dentry); 952 dlm_debug_put(dc); 953 } 954 } 955 956 /* subroot - domain dir */ 957 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm) 958 { 959 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name, 960 dlm_debugfs_root); 961 if (!dlm->dlm_debugfs_subroot) { 962 mlog_errno(-ENOMEM); 963 goto bail; 964 } 965 966 dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt), 967 GFP_KERNEL); 968 if (!dlm->dlm_debug_ctxt) { 969 mlog_errno(-ENOMEM); 970 goto bail; 971 } 972 kref_init(&dlm->dlm_debug_ctxt->debug_refcnt); 973 974 return 0; 975 bail: 976 dlm_destroy_debugfs_subroot(dlm); 977 return -ENOMEM; 978 } 979 980 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm) 981 { 982 debugfs_remove(dlm->dlm_debugfs_subroot); 983 } 984 985 /* debugfs root */ 986 int dlm_create_debugfs_root(void) 987 { 988 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL); 989 if (!dlm_debugfs_root) { 990 mlog_errno(-ENOMEM); 991 return -ENOMEM; 992 } 993 return 0; 994 } 995 996 void dlm_destroy_debugfs_root(void) 997 { 998 debugfs_remove(dlm_debugfs_root); 999 } 1000 #endif /* CONFIG_DEBUG_FS */ 1001