fs/ocfs2/dlm/dlmdebug.c

   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 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/utsname.h>
  31 #include <linux/sysctl.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/debugfs.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 void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
  48 {
  49         mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
  50                res->lockname.len, res->lockname.name,
  51                res->owner, res->state);
  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         mlog(ML_NOTICE, "  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 void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
  75 {
  76         struct list_head *iter2;
  77         struct dlm_lock *lock;
  78
  79         assert_spin_locked(&res->spinlock);
  80
  81         mlog(ML_NOTICE, "lockres: %.*s, owner=%u, state=%u\n",
  82                res->lockname.len, res->lockname.name,
  83                res->owner, res->state);
  84         mlog(ML_NOTICE, "  last used: %lu, on purge list: %s\n",
  85              res->last_used, list_empty(&res->purge) ? "no" : "yes");
  86         dlm_print_lockres_refmap(res);
  87         mlog(ML_NOTICE, "  granted queue: \n");
  88         list_for_each(iter2, &res->granted) {
  89                 lock = list_entry(iter2, struct dlm_lock, list);
  90                 spin_lock(&lock->spinlock);
  91                 mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
  92                        "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
  93                        lock->ml.type, lock->ml.convert_type, lock->ml.node,
  94                      dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
  95                      dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
  96                        list_empty(&lock->ast_list) ? 'y' : 'n',
  97                        lock->ast_pending ? 'y' : 'n',
  98                        list_empty(&lock->bast_list) ? 'y' : 'n',
  99                        lock->bast_pending ? 'y' : 'n');
 100                 spin_unlock(&lock->spinlock);
 101         }
 102         mlog(ML_NOTICE, "  converting queue: \n");
 103         list_for_each(iter2, &res->converting) {
 104                 lock = list_entry(iter2, struct dlm_lock, list);
 105                 spin_lock(&lock->spinlock);
 106                 mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
 107                        "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
 108                        lock->ml.type, lock->ml.convert_type, lock->ml.node,
 109                      dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
 110                      dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 111                        list_empty(&lock->ast_list) ? 'y' : 'n',
 112                        lock->ast_pending ? 'y' : 'n',
 113                        list_empty(&lock->bast_list) ? 'y' : 'n',
 114                        lock->bast_pending ? 'y' : 'n');
 115                 spin_unlock(&lock->spinlock);
 116         }
 117         mlog(ML_NOTICE, "  blocked queue: \n");
 118         list_for_each(iter2, &res->blocked) {
 119                 lock = list_entry(iter2, struct dlm_lock, list);
 120                 spin_lock(&lock->spinlock);
 121                 mlog(ML_NOTICE, "    type=%d, conv=%d, node=%u, "
 122                        "cookie=%u:%llu, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c)\n",
 123                        lock->ml.type, lock->ml.convert_type, lock->ml.node,
 124                      dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
 125                      dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 126                        list_empty(&lock->ast_list) ? 'y' : 'n',
 127                        lock->ast_pending ? 'y' : 'n',
 128                        list_empty(&lock->bast_list) ? 'y' : 'n',
 129                        lock->bast_pending ? 'y' : 'n');
 130                 spin_unlock(&lock->spinlock);
 131         }
 132 }
 133
 134 void dlm_print_one_lock(struct dlm_lock *lockid)
 135 {
 136         dlm_print_one_lock_resource(lockid->lockres);
 137 }
 138 EXPORT_SYMBOL_GPL(dlm_print_one_lock);
 139
 140 #if 0
 141 void dlm_dump_lock_resources(struct dlm_ctxt *dlm)
 142 {
 143         struct dlm_lock_resource *res;
 144         struct hlist_node *iter;
 145         struct hlist_head *bucket;
 146         int i;
 147
 148         mlog(ML_NOTICE, "struct dlm_ctxt: %s, node=%u, key=%u\n",
 149                   dlm->name, dlm->node_num, dlm->key);
 150         if (!dlm || !dlm->name) {
 151                 mlog(ML_ERROR, "dlm=%p\n", dlm);
 152                 return;
 153         }
 154
 155         spin_lock(&dlm->spinlock);
 156         for (i=0; i<DLM_HASH_BUCKETS; i++) {
 157                 bucket = dlm_lockres_hash(dlm, i);
 158                 hlist_for_each_entry(res, iter, bucket, hash_node)
 159                         dlm_print_one_lock_resource(res);
 160         }
 161         spin_unlock(&dlm->spinlock);
 162 }
 163 #endif  /*  0  */
 164
 165 static const char *dlm_errnames[] = {
 166         [DLM_NORMAL] =                  "DLM_NORMAL",
 167         [DLM_GRANTED] =                 "DLM_GRANTED",
 168         [DLM_DENIED] =                  "DLM_DENIED",
 169         [DLM_DENIED_NOLOCKS] =          "DLM_DENIED_NOLOCKS",
 170         [DLM_WORKING] =                 "DLM_WORKING",
 171         [DLM_BLOCKED] =                 "DLM_BLOCKED",
 172         [DLM_BLOCKED_ORPHAN] =          "DLM_BLOCKED_ORPHAN",
 173         [DLM_DENIED_GRACE_PERIOD] =     "DLM_DENIED_GRACE_PERIOD",
 174         [DLM_SYSERR] =                  "DLM_SYSERR",
 175         [DLM_NOSUPPORT] =               "DLM_NOSUPPORT",
 176         [DLM_CANCELGRANT] =             "DLM_CANCELGRANT",
 177         [DLM_IVLOCKID] =                "DLM_IVLOCKID",
 178         [DLM_SYNC] =                    "DLM_SYNC",
 179         [DLM_BADTYPE] =                 "DLM_BADTYPE",
 180         [DLM_BADRESOURCE] =             "DLM_BADRESOURCE",
 181         [DLM_MAXHANDLES] =              "DLM_MAXHANDLES",
 182         [DLM_NOCLINFO] =                "DLM_NOCLINFO",
 183         [DLM_NOLOCKMGR] =               "DLM_NOLOCKMGR",
 184         [DLM_NOPURGED] =                "DLM_NOPURGED",
 185         [DLM_BADARGS] =                 "DLM_BADARGS",
 186         [DLM_VOID] =                    "DLM_VOID",
 187         [DLM_NOTQUEUED] =               "DLM_NOTQUEUED",
 188         [DLM_IVBUFLEN] =                "DLM_IVBUFLEN",
 189         [DLM_CVTUNGRANT] =              "DLM_CVTUNGRANT",
 190         [DLM_BADPARAM] =                "DLM_BADPARAM",
 191         [DLM_VALNOTVALID] =             "DLM_VALNOTVALID",
 192         [DLM_REJECTED] =                "DLM_REJECTED",
 193         [DLM_ABORT] =                   "DLM_ABORT",
 194         [DLM_CANCEL] =                  "DLM_CANCEL",
 195         [DLM_IVRESHANDLE] =             "DLM_IVRESHANDLE",
 196         [DLM_DEADLOCK] =                "DLM_DEADLOCK",
 197         [DLM_DENIED_NOASTS] =           "DLM_DENIED_NOASTS",
 198         [DLM_FORWARD] =                 "DLM_FORWARD",
 199         [DLM_TIMEOUT] =                 "DLM_TIMEOUT",
 200         [DLM_IVGROUPID] =               "DLM_IVGROUPID",
 201         [DLM_VERS_CONFLICT] =           "DLM_VERS_CONFLICT",
 202         [DLM_BAD_DEVICE_PATH] =         "DLM_BAD_DEVICE_PATH",
 203         [DLM_NO_DEVICE_PERMISSION] =    "DLM_NO_DEVICE_PERMISSION",
 204         [DLM_NO_CONTROL_DEVICE ] =      "DLM_NO_CONTROL_DEVICE ",
 205         [DLM_RECOVERING] =              "DLM_RECOVERING",
 206         [DLM_MIGRATING] =               "DLM_MIGRATING",
 207         [DLM_MAXSTATS] =                "DLM_MAXSTATS",
 208 };
 209
 210 static const char *dlm_errmsgs[] = {
 211         [DLM_NORMAL] =                  "request in progress",
 212         [DLM_GRANTED] =                 "request granted",
 213         [DLM_DENIED] =                  "request denied",
 214         [DLM_DENIED_NOLOCKS] =          "request denied, out of system resources",
 215         [DLM_WORKING] =                 "async request in progress",
 216         [DLM_BLOCKED] =                 "lock request blocked",
 217         [DLM_BLOCKED_ORPHAN] =          "lock request blocked by a orphan lock",
 218         [DLM_DENIED_GRACE_PERIOD] =     "topological change in progress",
 219         [DLM_SYSERR] =                  "system error",
 220         [DLM_NOSUPPORT] =               "unsupported",
 221         [DLM_CANCELGRANT] =             "can't cancel convert: already granted",
 222         [DLM_IVLOCKID] =                "bad lockid",
 223         [DLM_SYNC] =                    "synchronous request granted",
 224         [DLM_BADTYPE] =                 "bad resource type",
 225         [DLM_BADRESOURCE] =             "bad resource handle",
 226         [DLM_MAXHANDLES] =              "no more resource handles",
 227         [DLM_NOCLINFO] =                "can't contact cluster manager",
 228         [DLM_NOLOCKMGR] =               "can't contact lock manager",
 229         [DLM_NOPURGED] =                "can't contact purge daemon",
 230         [DLM_BADARGS] =                 "bad api args",
 231         [DLM_VOID] =                    "no status",
 232         [DLM_NOTQUEUED] =               "NOQUEUE was specified and request failed",
 233         [DLM_IVBUFLEN] =                "invalid resource name length",
 234         [DLM_CVTUNGRANT] =              "attempted to convert ungranted lock",
 235         [DLM_BADPARAM] =                "invalid lock mode specified",
 236         [DLM_VALNOTVALID] =             "value block has been invalidated",
 237         [DLM_REJECTED] =                "request rejected, unrecognized client",
 238         [DLM_ABORT] =                   "blocked lock request cancelled",
 239         [DLM_CANCEL] =                  "conversion request cancelled",
 240         [DLM_IVRESHANDLE] =             "invalid resource handle",
 241         [DLM_DEADLOCK] =                "deadlock recovery refused this request",
 242         [DLM_DENIED_NOASTS] =           "failed to allocate AST",
 243         [DLM_FORWARD] =                 "request must wait for primary's response",
 244         [DLM_TIMEOUT] =                 "timeout value for lock has expired",
 245         [DLM_IVGROUPID] =               "invalid group specification",
 246         [DLM_VERS_CONFLICT] =           "version conflicts prevent request handling",
 247         [DLM_BAD_DEVICE_PATH] =         "Locks device does not exist or path wrong",
 248         [DLM_NO_DEVICE_PERMISSION] =    "Client has insufficient perms for device",
 249         [DLM_NO_CONTROL_DEVICE] =       "Cannot set options on opened device ",
 250         [DLM_RECOVERING] =              "lock resource being recovered",
 251         [DLM_MIGRATING] =               "lock resource being migrated",
 252         [DLM_MAXSTATS] =                "invalid error number",
 253 };
 254
 255 const char *dlm_errmsg(enum dlm_status err)
 256 {
 257         if (err >= DLM_MAXSTATS || err < 0)
 258                 return dlm_errmsgs[DLM_MAXSTATS];
 259         return dlm_errmsgs[err];
 260 }
 261 EXPORT_SYMBOL_GPL(dlm_errmsg);
 262
 263 const char *dlm_errname(enum dlm_status err)
 264 {
 265         if (err >= DLM_MAXSTATS || err < 0)
 266                 return dlm_errnames[DLM_MAXSTATS];
 267         return dlm_errnames[err];
 268 }
 269 EXPORT_SYMBOL_GPL(dlm_errname);
 270
 271
 272 #ifdef CONFIG_DEBUG_FS
 273
 274 static struct dentry *dlm_debugfs_root = NULL;
 275
 276 /* NOTE: This function converts a lockname into a string. It uses knowledge
 277  * of the format of the lockname that should be outside the purview of the dlm.
 278  * We are adding only to make dlm debugging slightly easier.
 279  *
 280  * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
 281  */
 282 static int stringify_lockname(const char *lockname, int locklen,
 283                               char *buf, int len)
 284 {
 285         int out = 0;
 286         __be64 inode_blkno_be;
 287
 288 #define OCFS2_DENTRY_LOCK_INO_START     18
 289         if (*lockname == 'N') {
 290                 memcpy((__be64 *)&inode_blkno_be,
 291                        (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
 292                        sizeof(__be64));
 293                 out += snprintf(buf + out, len - out, "%.*s%08x",
 294                                 OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
 295                                 (unsigned int)be64_to_cpu(inode_blkno_be));
 296         } else
 297                 out += snprintf(buf + out, len - out, "%.*s",
 298                                 locklen, lockname);
 299         return out;
 300 }
 301
 302 #define DLM_DEBUGFS_DIR                         "o2dlm"
 303 #define DLM_DEBUGFS_DLM_STATE                   "dlm_state"
 304 #define DLM_DEBUGFS_LOCKING_STATE               "locking_state"
 305
 306 /* begin - utils funcs */
 307 static void dlm_debug_free(struct kref *kref)
 308 {
 309         struct dlm_debug_ctxt *dc;
 310
 311         dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);
 312
 313         kfree(dc);
 314 }
 315
 316 void dlm_debug_put(struct dlm_debug_ctxt *dc)
 317 {
 318         if (dc)
 319                 kref_put(&dc->debug_refcnt, dlm_debug_free);
 320 }
 321
 322 static void dlm_debug_get(struct dlm_debug_ctxt *dc)
 323 {
 324         kref_get(&dc->debug_refcnt);
 325 }
 326
 327 static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
 328                              char *buf, int len)
 329 {
 330         int out = 0;
 331         int i = -1;
 332
 333         while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
 334                 out += snprintf(buf + out, len - out, "%d ", i);
 335
 336         return out;
 337 }
 338
 339 static struct debug_buffer *debug_buffer_allocate(void)
 340 {
 341         struct debug_buffer *db = NULL;
 342
 343         db = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
 344         if (!db)
 345                 goto bail;
 346
 347         db->len = PAGE_SIZE;
 348         db->buf = kmalloc(db->len, GFP_KERNEL);
 349         if (!db->buf)
 350                 goto bail;
 351
 352         return db;
 353 bail:
 354         kfree(db);
 355         return NULL;
 356 }
 357
 358 static ssize_t debug_buffer_read(struct file *file, char __user *buf,
 359                                  size_t nbytes, loff_t *ppos)
 360 {
 361         struct debug_buffer *db = file->private_data;
 362
 363         return simple_read_from_buffer(buf, nbytes, ppos, db->buf, db->len);
 364 }
 365
 366 static loff_t debug_buffer_llseek(struct file *file, loff_t off, int whence)
 367 {
 368         struct debug_buffer *db = file->private_data;
 369         loff_t new = -1;
 370
 371         switch (whence) {
 372         case 0:
 373                 new = off;
 374                 break;
 375         case 1:
 376                 new = file->f_pos + off;
 377                 break;
 378         }
 379
 380         if (new < 0 || new > db->len)
 381                 return -EINVAL;
 382
 383         return (file->f_pos = new);
 384 }
 385
 386 static int debug_buffer_release(struct inode *inode, struct file *file)
 387 {
 388         struct debug_buffer *db = (struct debug_buffer *)file->private_data;
 389
 390         if (db)
 391                 kfree(db->buf);
 392         kfree(db);
 393
 394         return 0;
 395 }
 396 /* end - util funcs */
 397
 398 /* begin - debug lockres funcs */
 399 static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
 400 {
 401         int out;
 402
 403 #define DEBUG_LOCK_VERSION      1
 404         spin_lock(&lock->spinlock);
 405         out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
 406                        "%d,%d,%d,%d\n",
 407                        DEBUG_LOCK_VERSION,
 408                        list_type, lock->ml.type, lock->ml.convert_type,
 409                        lock->ml.node,
 410                        dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
 411                        dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
 412                        !list_empty(&lock->ast_list),
 413                        !list_empty(&lock->bast_list),
 414                        lock->ast_pending, lock->bast_pending,
 415                        lock->convert_pending, lock->lock_pending,
 416                        lock->cancel_pending, lock->unlock_pending,
 417                        atomic_read(&lock->lock_refs.refcount));
 418         spin_unlock(&lock->spinlock);
 419
 420         return out;
 421 }
 422
 423 static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
 424 {
 425         struct dlm_lock *lock;
 426         int i;
 427         int out = 0;
 428
 429         out += snprintf(buf + out, len - out, "NAME:");
 430         out += stringify_lockname(res->lockname.name, res->lockname.len,
 431                                   buf + out, len - out);
 432         out += snprintf(buf + out, len - out, "\n");
 433
 434 #define DEBUG_LRES_VERSION      1
 435         out += snprintf(buf + out, len - out,
 436                         "LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
 437                         DEBUG_LRES_VERSION,
 438                         res->owner, res->state, res->last_used,
 439                         !list_empty(&res->purge),
 440                         !list_empty(&res->dirty),
 441                         !list_empty(&res->recovering),
 442                         res->inflight_locks, res->migration_pending,
 443                         atomic_read(&res->asts_reserved),
 444                         atomic_read(&res->refs.refcount));
 445
 446         /* refmap */
 447         out += snprintf(buf + out, len - out, "RMAP:");
 448         out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
 449                                  buf + out, len - out);
 450         out += snprintf(buf + out, len - out, "\n");
 451
 452         /* lvb */
 453         out += snprintf(buf + out, len - out, "LVBX:");
 454         for (i = 0; i < DLM_LVB_LEN; i++)
 455                 out += snprintf(buf + out, len - out,
 456                                         "%02x", (unsigned char)res->lvb[i]);
 457         out += snprintf(buf + out, len - out, "\n");
 458
 459         /* granted */
 460         list_for_each_entry(lock, &res->granted, list)
 461                 out += dump_lock(lock, 0, buf + out, len - out);
 462
 463         /* converting */
 464         list_for_each_entry(lock, &res->converting, list)
 465                 out += dump_lock(lock, 1, buf + out, len - out);
 466
 467         /* blocked */
 468         list_for_each_entry(lock, &res->blocked, list)
 469                 out += dump_lock(lock, 2, buf + out, len - out);
 470
 471         out += snprintf(buf + out, len - out, "\n");
 472
 473         return out;
 474 }
 475
 476 static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
 477 {
 478         struct debug_lockres *dl = m->private;
 479         struct dlm_ctxt *dlm = dl->dl_ctxt;
 480         struct dlm_lock_resource *res = NULL;
 481
 482         spin_lock(&dlm->spinlock);
 483
 484         if (dl->dl_res) {
 485                 list_for_each_entry(res, &dl->dl_res->tracking, tracking) {
 486                         if (dl->dl_res) {
 487                                 dlm_lockres_put(dl->dl_res);
 488                                 dl->dl_res = NULL;
 489                         }
 490                         if (&res->tracking == &dlm->tracking_list) {
 491                                 mlog(0, "End of list found, %p\n", res);
 492                                 dl = NULL;
 493                                 break;
 494                         }
 495                         dlm_lockres_get(res);
 496                         dl->dl_res = res;
 497                         break;
 498                 }
 499         } else {
 500                 if (!list_empty(&dlm->tracking_list)) {
 501                         list_for_each_entry(res, &dlm->tracking_list, tracking)
 502                                 break;
 503                         dlm_lockres_get(res);
 504                         dl->dl_res = res;
 505                 } else
 506                         dl = NULL;
 507         }
 508
 509         if (dl) {
 510                 spin_lock(&dl->dl_res->spinlock);
 511                 dump_lockres(dl->dl_res, dl->dl_buf, dl->dl_len - 1);
 512                 spin_unlock(&dl->dl_res->spinlock);
 513         }
 514
 515         spin_unlock(&dlm->spinlock);
 516
 517         return dl;
 518 }
 519
 520 static void lockres_seq_stop(struct seq_file *m, void *v)
 521 {
 522 }
 523
 524 static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
 525 {
 526         return NULL;
 527 }
 528
 529 static int lockres_seq_show(struct seq_file *s, void *v)
 530 {
 531         struct debug_lockres *dl = (struct debug_lockres *)v;
 532
 533         seq_printf(s, "%s", dl->dl_buf);
 534
 535         return 0;
 536 }
 537
 538 static struct seq_operations debug_lockres_ops = {
 539         .start =        lockres_seq_start,
 540         .stop =         lockres_seq_stop,
 541         .next =         lockres_seq_next,
 542         .show =         lockres_seq_show,
 543 };
 544
 545 static int debug_lockres_open(struct inode *inode, struct file *file)
 546 {
 547         struct dlm_ctxt *dlm = inode->i_private;
 548         int ret = -ENOMEM;
 549         struct seq_file *seq;
 550         struct debug_lockres *dl = NULL;
 551
 552         dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
 553         if (!dl) {
 554                 mlog_errno(ret);
 555                 goto bail;
 556         }
 557
 558         dl->dl_len = PAGE_SIZE;
 559         dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
 560         if (!dl->dl_buf) {
 561                 mlog_errno(ret);
 562                 goto bail;
 563         }
 564
 565         ret = seq_open(file, &debug_lockres_ops);
 566         if (ret) {
 567                 mlog_errno(ret);
 568                 goto bail;
 569         }
 570
 571         seq = (struct seq_file *) file->private_data;
 572         seq->private = dl;
 573
 574         dlm_grab(dlm);
 575         dl->dl_ctxt = dlm;
 576
 577         return 0;
 578 bail:
 579         if (dl)
 580                 kfree(dl->dl_buf);
 581         kfree(dl);
 582         return ret;
 583 }
 584
 585 static int debug_lockres_release(struct inode *inode, struct file *file)
 586 {
 587         struct seq_file *seq = (struct seq_file *)file->private_data;
 588         struct debug_lockres *dl = (struct debug_lockres *)seq->private;
 589
 590         if (dl->dl_res)
 591                 dlm_lockres_put(dl->dl_res);
 592         dlm_put(dl->dl_ctxt);
 593         kfree(dl->dl_buf);
 594         return seq_release_private(inode, file);
 595 }
 596
 597 static struct file_operations debug_lockres_fops = {
 598         .open =         debug_lockres_open,
 599         .release =      debug_lockres_release,
 600         .read =         seq_read,
 601         .llseek =       seq_lseek,
 602 };
 603 /* end - debug lockres funcs */
 604
 605 /* begin - debug state funcs */
 606 static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
 607 {
 608         int out = 0;
 609         struct dlm_reco_node_data *node;
 610         char *state;
 611         int lres, rres, ures, tres;
 612
 613         lres = atomic_read(&dlm->local_resources);
 614         rres = atomic_read(&dlm->remote_resources);
 615         ures = atomic_read(&dlm->unknown_resources);
 616         tres = lres + rres + ures;
 617
 618         spin_lock(&dlm->spinlock);
 619
 620         switch (dlm->dlm_state) {
 621         case DLM_CTXT_NEW:
 622                 state = "NEW"; break;
 623         case DLM_CTXT_JOINED:
 624                 state = "JOINED"; break;
 625         case DLM_CTXT_IN_SHUTDOWN:
 626                 state = "SHUTDOWN"; break;
 627         case DLM_CTXT_LEAVING:
 628                 state = "LEAVING"; break;
 629         default:
 630                 state = "UNKNOWN"; break;
 631         }
 632
 633         /* Domain: xxxxxxxxxx  Key: 0xdfbac769 */
 634         out += snprintf(db->buf + out, db->len - out,
 635                         "Domain: %s  Key: 0x%08x\n", dlm->name, dlm->key);
 636
 637         /* Thread Pid: xxx  Node: xxx  State: xxxxx */
 638         out += snprintf(db->buf + out, db->len - out,
 639                         "Thread Pid: %d  Node: %d  State: %s\n",
 640                         dlm->dlm_thread_task->pid, dlm->node_num, state);
 641
 642         /* Number of Joins: xxx  Joining Node: xxx */
 643         out += snprintf(db->buf + out, db->len - out,
 644                         "Number of Joins: %d  Joining Node: %d\n",
 645                         dlm->num_joins, dlm->joining_node);
 646
 647         /* Domain Map: xx xx xx */
 648         out += snprintf(db->buf + out, db->len - out, "Domain Map: ");
 649         out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
 650                                  db->buf + out, db->len - out);
 651         out += snprintf(db->buf + out, db->len - out, "\n");
 652
 653         /* Live Map: xx xx xx */
 654         out += snprintf(db->buf + out, db->len - out, "Live Map: ");
 655         out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
 656                                  db->buf + out, db->len - out);
 657         out += snprintf(db->buf + out, db->len - out, "\n");
 658
 659         /* Mastered Resources Total: xxx  Locally: xxx  Remotely: ... */
 660         out += snprintf(db->buf + out, db->len - out,
 661                         "Mastered Resources Total: %d  Locally: %d  "
 662                         "Remotely: %d  Unknown: %d\n",
 663                         tres, lres, rres, ures);
 664
 665         /* Lists: Dirty=Empty  Purge=InUse  PendingASTs=Empty  ... */
 666         out += snprintf(db->buf + out, db->len - out,
 667                         "Lists: Dirty=%s  Purge=%s  PendingASTs=%s  "
 668                         "PendingBASTs=%s  Master=%s\n",
 669                         (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
 670                         (list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
 671                         (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
 672                         (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"),
 673                         (list_empty(&dlm->master_list) ? "Empty" : "InUse"));
 674
 675         /* Purge Count: xxx  Refs: xxx */
 676         out += snprintf(db->buf + out, db->len - out,
 677                         "Purge Count: %d  Refs: %d\n", dlm->purge_count,
 678                         atomic_read(&dlm->dlm_refs.refcount));
 679
 680         /* Dead Node: xxx */
 681         out += snprintf(db->buf + out, db->len - out,
 682                         "Dead Node: %d\n", dlm->reco.dead_node);
 683
 684         /* What about DLM_RECO_STATE_FINALIZE? */
 685         if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
 686                 state = "ACTIVE";
 687         else
 688                 state = "INACTIVE";
 689
 690         /* Recovery Pid: xxxx  Master: xxx  State: xxxx */
 691         out += snprintf(db->buf + out, db->len - out,
 692                         "Recovery Pid: %d  Master: %d  State: %s\n",
 693                         dlm->dlm_reco_thread_task->pid,
 694                         dlm->reco.new_master, state);
 695
 696         /* Recovery Map: xx xx */
 697         out += snprintf(db->buf + out, db->len - out, "Recovery Map: ");
 698         out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
 699                                  db->buf + out, db->len - out);
 700         out += snprintf(db->buf + out, db->len - out, "\n");
 701
 702         /* Recovery Node State: */
 703         out += snprintf(db->buf + out, db->len - out, "Recovery Node State:\n");
 704         list_for_each_entry(node, &dlm->reco.node_data, list) {
 705                 switch (node->state) {
 706                 case DLM_RECO_NODE_DATA_INIT:
 707                         state = "INIT";
 708                         break;
 709                 case DLM_RECO_NODE_DATA_REQUESTING:
 710                         state = "REQUESTING";
 711                         break;
 712                 case DLM_RECO_NODE_DATA_DEAD:
 713                         state = "DEAD";
 714                         break;
 715                 case DLM_RECO_NODE_DATA_RECEIVING:
 716                         state = "RECEIVING";
 717                         break;
 718                 case DLM_RECO_NODE_DATA_REQUESTED:
 719                         state = "REQUESTED";
 720                         break;
 721                 case DLM_RECO_NODE_DATA_DONE:
 722                         state = "DONE";
 723                         break;
 724                 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
 725                         state = "FINALIZE-SENT";
 726                         break;
 727                 default:
 728                         state = "BAD";
 729                         break;
 730                 }
 731                 out += snprintf(db->buf + out, db->len - out, "\t%u - %s\n",
 732                                 node->node_num, state);
 733         }
 734
 735         spin_unlock(&dlm->spinlock);
 736
 737         return out;
 738 }
 739
 740 static int debug_state_open(struct inode *inode, struct file *file)
 741 {
 742         struct dlm_ctxt *dlm = inode->i_private;
 743         struct debug_buffer *db = NULL;
 744
 745         db = debug_buffer_allocate();
 746         if (!db)
 747                 goto bail;
 748
 749         db->len = debug_state_print(dlm, db);
 750
 751         file->private_data = db;
 752
 753         return 0;
 754 bail:
 755         return -ENOMEM;
 756 }
 757
 758 static struct file_operations debug_state_fops = {
 759         .open =         debug_state_open,
 760         .release =      debug_buffer_release,
 761         .read =         debug_buffer_read,
 762         .llseek =       debug_buffer_llseek,
 763 };
 764 /* end  - debug state funcs */
 765
 766 /* files in subroot */
 767 int dlm_debug_init(struct dlm_ctxt *dlm)
 768 {
 769         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
 770
 771         /* for dumping dlm_ctxt */
 772         dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
 773                                                      S_IFREG|S_IRUSR,
 774                                                      dlm->dlm_debugfs_subroot,
 775                                                      dlm, &debug_state_fops);
 776         if (!dc->debug_state_dentry) {
 777                 mlog_errno(-ENOMEM);
 778                 goto bail;
 779         }
 780
 781         /* for dumping lockres */
 782         dc->debug_lockres_dentry =
 783                         debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
 784                                             S_IFREG|S_IRUSR,
 785                                             dlm->dlm_debugfs_subroot,
 786                                             dlm, &debug_lockres_fops);
 787         if (!dc->debug_lockres_dentry) {
 788                 mlog_errno(-ENOMEM);
 789                 goto bail;
 790         }
 791
 792         dlm_debug_get(dc);
 793         return 0;
 794
 795 bail:
 796         dlm_debug_shutdown(dlm);
 797         return -ENOMEM;
 798 }
 799
 800 void dlm_debug_shutdown(struct dlm_ctxt *dlm)
 801 {
 802         struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;
 803
 804         if (dc) {
 805                 if (dc->debug_lockres_dentry)
 806                         debugfs_remove(dc->debug_lockres_dentry);
 807                 if (dc->debug_state_dentry)
 808                         debugfs_remove(dc->debug_state_dentry);
 809                 dlm_debug_put(dc);
 810         }
 811 }
 812
 813 /* subroot - domain dir */
 814 int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
 815 {
 816         dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
 817                                                       dlm_debugfs_root);
 818         if (!dlm->dlm_debugfs_subroot) {
 819                 mlog_errno(-ENOMEM);
 820                 goto bail;
 821         }
 822
 823         dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
 824                                       GFP_KERNEL);
 825         if (!dlm->dlm_debug_ctxt) {
 826                 mlog_errno(-ENOMEM);
 827                 goto bail;
 828         }
 829         kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);
 830
 831         return 0;
 832 bail:
 833         dlm_destroy_debugfs_subroot(dlm);
 834         return -ENOMEM;
 835 }
 836
 837 void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
 838 {
 839         if (dlm->dlm_debugfs_subroot)
 840                 debugfs_remove(dlm->dlm_debugfs_subroot);
 841 }
 842
 843 /* debugfs root */
 844 int dlm_create_debugfs_root(void)
 845 {
 846         dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
 847         if (!dlm_debugfs_root) {
 848                 mlog_errno(-ENOMEM);
 849                 return -ENOMEM;
 850         }
 851         return 0;
 852 }
 853
 854 void dlm_destroy_debugfs_root(void)
 855 {
 856         if (dlm_debugfs_root)
 857                 debugfs_remove(dlm_debugfs_root);
 858 }
 859 #endif  /* CONFIG_DEBUG_FS */