fs/ocfs2/dlm/dlmdebug.c

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