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 kref_read(&lock->lock_refs), 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, kref_read(&res->refs), 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 kref_read(&mle->mle_refs)); 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_ATOMIC); 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 int debug_release(struct inode *inode, struct file *file) 351 { 352 free_page((unsigned long)file->private_data); 353 return 0; 354 } 355 356 static ssize_t debug_read(struct file *file, char __user *buf, 357 size_t nbytes, loff_t *ppos) 358 { 359 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, 360 i_size_read(file->f_mapping->host)); 361 } 362 /* end - util funcs */ 363 364 /* begin - purge list funcs */ 365 static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len) 366 { 367 struct dlm_lock_resource *res; 368 int out = 0; 369 unsigned long total = 0; 370 371 out += snprintf(buf + out, len - out, 372 "Dumping Purgelist for Domain: %s\n", dlm->name); 373 374 spin_lock(&dlm->spinlock); 375 list_for_each_entry(res, &dlm->purge_list, purge) { 376 ++total; 377 if (len - out < 100) 378 continue; 379 spin_lock(&res->spinlock); 380 out += stringify_lockname(res->lockname.name, 381 res->lockname.len, 382 buf + out, len - out); 383 out += snprintf(buf + out, len - out, "\t%ld\n", 384 (jiffies - res->last_used)/HZ); 385 spin_unlock(&res->spinlock); 386 } 387 spin_unlock(&dlm->spinlock); 388 389 out += snprintf(buf + out, len - out, "Total on list: %lu\n", total); 390 391 return out; 392 } 393 394 static int debug_purgelist_open(struct inode *inode, struct file *file) 395 { 396 struct dlm_ctxt *dlm = inode->i_private; 397 char *buf = NULL; 398 399 buf = (char *) get_zeroed_page(GFP_NOFS); 400 if (!buf) 401 goto bail; 402 403 i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1)); 404 405 file->private_data = buf; 406 407 return 0; 408 bail: 409 return -ENOMEM; 410 } 411 412 static const struct file_operations debug_purgelist_fops = { 413 .open = debug_purgelist_open, 414 .release = debug_release, 415 .read = debug_read, 416 .llseek = generic_file_llseek, 417 }; 418 /* end - purge list funcs */ 419 420 /* begin - debug mle funcs */ 421 static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len) 422 { 423 struct dlm_master_list_entry *mle; 424 struct hlist_head *bucket; 425 int i, out = 0; 426 unsigned long total = 0, longest = 0, bucket_count = 0; 427 428 out += snprintf(buf + out, len - out, 429 "Dumping MLEs for Domain: %s\n", dlm->name); 430 431 spin_lock(&dlm->master_lock); 432 for (i = 0; i < DLM_HASH_BUCKETS; i++) { 433 bucket = dlm_master_hash(dlm, i); 434 hlist_for_each_entry(mle, bucket, master_hash_node) { 435 ++total; 436 ++bucket_count; 437 if (len - out < 200) 438 continue; 439 out += dump_mle(mle, buf + out, len - out); 440 } 441 longest = max(longest, bucket_count); 442 bucket_count = 0; 443 } 444 spin_unlock(&dlm->master_lock); 445 446 out += snprintf(buf + out, len - out, 447 "Total: %lu, Longest: %lu\n", total, longest); 448 return out; 449 } 450 451 static int debug_mle_open(struct inode *inode, struct file *file) 452 { 453 struct dlm_ctxt *dlm = inode->i_private; 454 char *buf = NULL; 455 456 buf = (char *) get_zeroed_page(GFP_NOFS); 457 if (!buf) 458 goto bail; 459 460 i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1)); 461 462 file->private_data = buf; 463 464 return 0; 465 bail: 466 return -ENOMEM; 467 } 468 469 static const struct file_operations debug_mle_fops = { 470 .open = debug_mle_open, 471 .release = debug_release, 472 .read = debug_read, 473 .llseek = generic_file_llseek, 474 }; 475 476 /* end - debug mle funcs */ 477 478 /* begin - debug lockres funcs */ 479 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len) 480 { 481 int out; 482 483 #define DEBUG_LOCK_VERSION 1 484 spin_lock(&lock->spinlock); 485 out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d," 486 "%d,%d,%d,%d\n", 487 DEBUG_LOCK_VERSION, 488 list_type, lock->ml.type, lock->ml.convert_type, 489 lock->ml.node, 490 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), 491 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), 492 !list_empty(&lock->ast_list), 493 !list_empty(&lock->bast_list), 494 lock->ast_pending, lock->bast_pending, 495 lock->convert_pending, lock->lock_pending, 496 lock->cancel_pending, lock->unlock_pending, 497 kref_read(&lock->lock_refs)); 498 spin_unlock(&lock->spinlock); 499 500 return out; 501 } 502 503 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len) 504 { 505 struct dlm_lock *lock; 506 int i; 507 int out = 0; 508 509 out += snprintf(buf + out, len - out, "NAME:"); 510 out += stringify_lockname(res->lockname.name, res->lockname.len, 511 buf + out, len - out); 512 out += snprintf(buf + out, len - out, "\n"); 513 514 #define DEBUG_LRES_VERSION 1 515 out += snprintf(buf + out, len - out, 516 "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n", 517 DEBUG_LRES_VERSION, 518 res->owner, res->state, res->last_used, 519 !list_empty(&res->purge), 520 !list_empty(&res->dirty), 521 !list_empty(&res->recovering), 522 res->inflight_locks, res->migration_pending, 523 atomic_read(&res->asts_reserved), 524 kref_read(&res->refs)); 525 526 /* refmap */ 527 out += snprintf(buf + out, len - out, "RMAP:"); 528 out += stringify_nodemap(res->refmap, O2NM_MAX_NODES, 529 buf + out, len - out); 530 out += snprintf(buf + out, len - out, "\n"); 531 532 /* lvb */ 533 out += snprintf(buf + out, len - out, "LVBX:"); 534 for (i = 0; i < DLM_LVB_LEN; i++) 535 out += snprintf(buf + out, len - out, 536 "%02x", (unsigned char)res->lvb[i]); 537 out += snprintf(buf + out, len - out, "\n"); 538 539 /* granted */ 540 list_for_each_entry(lock, &res->granted, list) 541 out += dump_lock(lock, 0, buf + out, len - out); 542 543 /* converting */ 544 list_for_each_entry(lock, &res->converting, list) 545 out += dump_lock(lock, 1, buf + out, len - out); 546 547 /* blocked */ 548 list_for_each_entry(lock, &res->blocked, list) 549 out += dump_lock(lock, 2, buf + out, len - out); 550 551 out += snprintf(buf + out, len - out, "\n"); 552 553 return out; 554 } 555 556 static void *lockres_seq_start(struct seq_file *m, loff_t *pos) 557 { 558 struct debug_lockres *dl = m->private; 559 struct dlm_ctxt *dlm = dl->dl_ctxt; 560 struct dlm_lock_resource *oldres = dl->dl_res; 561 struct dlm_lock_resource *res = NULL; 562 struct list_head *track_list; 563 564 spin_lock(&dlm->track_lock); 565 if (oldres) 566 track_list = &oldres->tracking; 567 else { 568 track_list = &dlm->tracking_list; 569 if (list_empty(track_list)) { 570 dl = NULL; 571 spin_unlock(&dlm->track_lock); 572 goto bail; 573 } 574 } 575 576 list_for_each_entry(res, track_list, tracking) { 577 if (&res->tracking == &dlm->tracking_list) 578 res = NULL; 579 else 580 dlm_lockres_get(res); 581 break; 582 } 583 spin_unlock(&dlm->track_lock); 584 585 if (oldres) 586 dlm_lockres_put(oldres); 587 588 dl->dl_res = res; 589 590 if (res) { 591 spin_lock(&res->spinlock); 592 dump_lockres(res, dl->dl_buf, dl->dl_len - 1); 593 spin_unlock(&res->spinlock); 594 } else 595 dl = NULL; 596 597 bail: 598 /* passed to seq_show */ 599 return dl; 600 } 601 602 static void lockres_seq_stop(struct seq_file *m, void *v) 603 { 604 } 605 606 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos) 607 { 608 return NULL; 609 } 610 611 static int lockres_seq_show(struct seq_file *s, void *v) 612 { 613 struct debug_lockres *dl = (struct debug_lockres *)v; 614 615 seq_printf(s, "%s", dl->dl_buf); 616 617 return 0; 618 } 619 620 static const struct seq_operations debug_lockres_ops = { 621 .start = lockres_seq_start, 622 .stop = lockres_seq_stop, 623 .next = lockres_seq_next, 624 .show = lockres_seq_show, 625 }; 626 627 static int debug_lockres_open(struct inode *inode, struct file *file) 628 { 629 struct dlm_ctxt *dlm = inode->i_private; 630 struct debug_lockres *dl; 631 void *buf; 632 633 buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 634 if (!buf) 635 goto bail; 636 637 dl = __seq_open_private(file, &debug_lockres_ops, sizeof(*dl)); 638 if (!dl) 639 goto bailfree; 640 641 dl->dl_len = PAGE_SIZE; 642 dl->dl_buf = buf; 643 644 dlm_grab(dlm); 645 dl->dl_ctxt = dlm; 646 647 return 0; 648 649 bailfree: 650 kfree(buf); 651 bail: 652 mlog_errno(-ENOMEM); 653 return -ENOMEM; 654 } 655 656 static int debug_lockres_release(struct inode *inode, struct file *file) 657 { 658 struct seq_file *seq = file->private_data; 659 struct debug_lockres *dl = (struct debug_lockres *)seq->private; 660 661 if (dl->dl_res) 662 dlm_lockres_put(dl->dl_res); 663 dlm_put(dl->dl_ctxt); 664 kfree(dl->dl_buf); 665 return seq_release_private(inode, file); 666 } 667 668 static const struct file_operations debug_lockres_fops = { 669 .open = debug_lockres_open, 670 .release = debug_lockres_release, 671 .read = seq_read, 672 .llseek = seq_lseek, 673 }; 674 /* end - debug lockres funcs */ 675 676 /* begin - debug state funcs */ 677 static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len) 678 { 679 int out = 0; 680 struct dlm_reco_node_data *node; 681 char *state; 682 int cur_mles = 0, tot_mles = 0; 683 int i; 684 685 spin_lock(&dlm->spinlock); 686 687 switch (dlm->dlm_state) { 688 case DLM_CTXT_NEW: 689 state = "NEW"; break; 690 case DLM_CTXT_JOINED: 691 state = "JOINED"; break; 692 case DLM_CTXT_IN_SHUTDOWN: 693 state = "SHUTDOWN"; break; 694 case DLM_CTXT_LEAVING: 695 state = "LEAVING"; break; 696 default: 697 state = "UNKNOWN"; break; 698 } 699 700 /* Domain: xxxxxxxxxx Key: 0xdfbac769 */ 701 out += snprintf(buf + out, len - out, 702 "Domain: %s Key: 0x%08x Protocol: %d.%d\n", 703 dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major, 704 dlm->dlm_locking_proto.pv_minor); 705 706 /* Thread Pid: xxx Node: xxx State: xxxxx */ 707 out += snprintf(buf + out, len - out, 708 "Thread Pid: %d Node: %d State: %s\n", 709 task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state); 710 711 /* Number of Joins: xxx Joining Node: xxx */ 712 out += snprintf(buf + out, len - out, 713 "Number of Joins: %d Joining Node: %d\n", 714 dlm->num_joins, dlm->joining_node); 715 716 /* Domain Map: xx xx xx */ 717 out += snprintf(buf + out, len - out, "Domain Map: "); 718 out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES, 719 buf + out, len - out); 720 out += snprintf(buf + out, len - out, "\n"); 721 722 /* Exit Domain Map: xx xx xx */ 723 out += snprintf(buf + out, len - out, "Exit Domain Map: "); 724 out += stringify_nodemap(dlm->exit_domain_map, O2NM_MAX_NODES, 725 buf + out, len - out); 726 out += snprintf(buf + out, len - out, "\n"); 727 728 /* Live Map: xx xx xx */ 729 out += snprintf(buf + out, len - out, "Live Map: "); 730 out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES, 731 buf + out, len - out); 732 out += snprintf(buf + out, len - out, "\n"); 733 734 /* Lock Resources: xxx (xxx) */ 735 out += snprintf(buf + out, len - out, 736 "Lock Resources: %d (%d)\n", 737 atomic_read(&dlm->res_cur_count), 738 atomic_read(&dlm->res_tot_count)); 739 740 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) 741 tot_mles += atomic_read(&dlm->mle_tot_count[i]); 742 743 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) 744 cur_mles += atomic_read(&dlm->mle_cur_count[i]); 745 746 /* MLEs: xxx (xxx) */ 747 out += snprintf(buf + out, len - out, 748 "MLEs: %d (%d)\n", cur_mles, tot_mles); 749 750 /* Blocking: xxx (xxx) */ 751 out += snprintf(buf + out, len - out, 752 " Blocking: %d (%d)\n", 753 atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]), 754 atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK])); 755 756 /* Mastery: xxx (xxx) */ 757 out += snprintf(buf + out, len - out, 758 " Mastery: %d (%d)\n", 759 atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]), 760 atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER])); 761 762 /* Migration: xxx (xxx) */ 763 out += snprintf(buf + out, len - out, 764 " Migration: %d (%d)\n", 765 atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]), 766 atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION])); 767 768 /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */ 769 out += snprintf(buf + out, len - out, 770 "Lists: Dirty=%s Purge=%s PendingASTs=%s " 771 "PendingBASTs=%s\n", 772 (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"), 773 (list_empty(&dlm->purge_list) ? "Empty" : "InUse"), 774 (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"), 775 (list_empty(&dlm->pending_basts) ? "Empty" : "InUse")); 776 777 /* Purge Count: xxx Refs: xxx */ 778 out += snprintf(buf + out, len - out, 779 "Purge Count: %d Refs: %d\n", dlm->purge_count, 780 kref_read(&dlm->dlm_refs)); 781 782 /* Dead Node: xxx */ 783 out += snprintf(buf + out, len - out, 784 "Dead Node: %d\n", dlm->reco.dead_node); 785 786 /* What about DLM_RECO_STATE_FINALIZE? */ 787 if (dlm->reco.state == DLM_RECO_STATE_ACTIVE) 788 state = "ACTIVE"; 789 else 790 state = "INACTIVE"; 791 792 /* Recovery Pid: xxxx Master: xxx State: xxxx */ 793 out += snprintf(buf + out, len - out, 794 "Recovery Pid: %d Master: %d State: %s\n", 795 task_pid_nr(dlm->dlm_reco_thread_task), 796 dlm->reco.new_master, state); 797 798 /* Recovery Map: xx xx */ 799 out += snprintf(buf + out, len - out, "Recovery Map: "); 800 out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES, 801 buf + out, len - out); 802 out += snprintf(buf + out, len - out, "\n"); 803 804 /* Recovery Node State: */ 805 out += snprintf(buf + out, len - out, "Recovery Node State:\n"); 806 list_for_each_entry(node, &dlm->reco.node_data, list) { 807 switch (node->state) { 808 case DLM_RECO_NODE_DATA_INIT: 809 state = "INIT"; 810 break; 811 case DLM_RECO_NODE_DATA_REQUESTING: 812 state = "REQUESTING"; 813 break; 814 case DLM_RECO_NODE_DATA_DEAD: 815 state = "DEAD"; 816 break; 817 case DLM_RECO_NODE_DATA_RECEIVING: 818 state = "RECEIVING"; 819 break; 820 case DLM_RECO_NODE_DATA_REQUESTED: 821 state = "REQUESTED"; 822 break; 823 case DLM_RECO_NODE_DATA_DONE: 824 state = "DONE"; 825 break; 826 case DLM_RECO_NODE_DATA_FINALIZE_SENT: 827 state = "FINALIZE-SENT"; 828 break; 829 default: 830 state = "BAD"; 831 break; 832 } 833 out += snprintf(buf + out, len - out, "\t%u - %s\n", 834 node->node_num, state); 835 } 836 837 spin_unlock(&dlm->spinlock); 838 839 return out; 840 } 841 842 static int debug_state_open(struct inode *inode, struct file *file) 843 { 844 struct dlm_ctxt *dlm = inode->i_private; 845 char *buf = NULL; 846 847 buf = (char *) get_zeroed_page(GFP_NOFS); 848 if (!buf) 849 goto bail; 850 851 i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1)); 852 853 file->private_data = buf; 854 855 return 0; 856 bail: 857 return -ENOMEM; 858 } 859 860 static const struct file_operations debug_state_fops = { 861 .open = debug_state_open, 862 .release = debug_release, 863 .read = debug_read, 864 .llseek = generic_file_llseek, 865 }; 866 /* end - debug state funcs */ 867 868 /* files in subroot */ 869 int dlm_debug_init(struct dlm_ctxt *dlm) 870 { 871 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt; 872 873 /* for dumping dlm_ctxt */ 874 dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE, 875 S_IFREG|S_IRUSR, 876 dlm->dlm_debugfs_subroot, 877 dlm, &debug_state_fops); 878 if (!dc->debug_state_dentry) { 879 mlog_errno(-ENOMEM); 880 goto bail; 881 } 882 883 /* for dumping lockres */ 884 dc->debug_lockres_dentry = 885 debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE, 886 S_IFREG|S_IRUSR, 887 dlm->dlm_debugfs_subroot, 888 dlm, &debug_lockres_fops); 889 if (!dc->debug_lockres_dentry) { 890 mlog_errno(-ENOMEM); 891 goto bail; 892 } 893 894 /* for dumping mles */ 895 dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE, 896 S_IFREG|S_IRUSR, 897 dlm->dlm_debugfs_subroot, 898 dlm, &debug_mle_fops); 899 if (!dc->debug_mle_dentry) { 900 mlog_errno(-ENOMEM); 901 goto bail; 902 } 903 904 /* for dumping lockres on the purge list */ 905 dc->debug_purgelist_dentry = 906 debugfs_create_file(DLM_DEBUGFS_PURGE_LIST, 907 S_IFREG|S_IRUSR, 908 dlm->dlm_debugfs_subroot, 909 dlm, &debug_purgelist_fops); 910 if (!dc->debug_purgelist_dentry) { 911 mlog_errno(-ENOMEM); 912 goto bail; 913 } 914 915 return 0; 916 917 bail: 918 return -ENOMEM; 919 } 920 921 void dlm_debug_shutdown(struct dlm_ctxt *dlm) 922 { 923 struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt; 924 925 if (dc) { 926 debugfs_remove(dc->debug_purgelist_dentry); 927 debugfs_remove(dc->debug_mle_dentry); 928 debugfs_remove(dc->debug_lockres_dentry); 929 debugfs_remove(dc->debug_state_dentry); 930 kfree(dc); 931 dc = NULL; 932 } 933 } 934 935 /* subroot - domain dir */ 936 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm) 937 { 938 dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name, 939 dlm_debugfs_root); 940 if (!dlm->dlm_debugfs_subroot) { 941 mlog_errno(-ENOMEM); 942 goto bail; 943 } 944 945 dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt), 946 GFP_KERNEL); 947 if (!dlm->dlm_debug_ctxt) { 948 mlog_errno(-ENOMEM); 949 goto bail; 950 } 951 952 return 0; 953 bail: 954 dlm_destroy_debugfs_subroot(dlm); 955 return -ENOMEM; 956 } 957 958 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm) 959 { 960 debugfs_remove(dlm->dlm_debugfs_subroot); 961 } 962 963 /* debugfs root */ 964 int dlm_create_debugfs_root(void) 965 { 966 dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL); 967 if (!dlm_debugfs_root) { 968 mlog_errno(-ENOMEM); 969 return -ENOMEM; 970 } 971 return 0; 972 } 973 974 void dlm_destroy_debugfs_root(void) 975 { 976 debugfs_remove(dlm_debugfs_root); 977 } 978 #endif /* CONFIG_DEBUG_FS */ 979