release/src-rt-6.x.4708/linux/linux-2.6.36/fs/dlm/dlm_internal.h

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2010 Red Hat, Inc.  All rights reserved.
   6 **
   7 **  This copyrighted material is made available to anyone wishing to use,
   8 **  modify, copy, or redistribute it subject to the terms and conditions
   9 **  of the GNU General Public License v.2.
  10 **
  11 *******************************************************************************
  12 ******************************************************************************/
  13
  14 #ifndef __DLM_INTERNAL_DOT_H__
  15 #define __DLM_INTERNAL_DOT_H__
  16
  17 /*
  18  * This is the main header file to be included in each DLM source file.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/sched.h>
  24 #include <linux/types.h>
  25 #include <linux/ctype.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/list.h>
  29 #include <linux/errno.h>
  30 #include <linux/random.h>
  31 #include <linux/delay.h>
  32 #include <linux/socket.h>
  33 #include <linux/kthread.h>
  34 #include <linux/kobject.h>
  35 #include <linux/kref.h>
  36 #include <linux/kernel.h>
  37 #include <linux/jhash.h>
  38 #include <linux/miscdevice.h>
  39 #include <linux/mutex.h>
  40 #include <asm/uaccess.h>
  41
  42 #include <linux/dlm.h>
  43 #include "config.h"
  44
  45
  46 #define DLM_INBUF_LEN           148
  47
  48 struct dlm_ls;
  49 struct dlm_lkb;
  50 struct dlm_rsb;
  51 struct dlm_member;
  52 struct dlm_lkbtable;
  53 struct dlm_rsbtable;
  54 struct dlm_dirtable;
  55 struct dlm_direntry;
  56 struct dlm_recover;
  57 struct dlm_header;
  58 struct dlm_message;
  59 struct dlm_rcom;
  60 struct dlm_mhandle;
  61
  62 #define log_print(fmt, args...) \
  63         printk(KERN_ERR "dlm: "fmt"\n" , ##args)
  64 #define log_error(ls, fmt, args...) \
  65         printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
  66
  67 #define log_debug(ls, fmt, args...) \
  68 do { \
  69         if (dlm_config.ci_log_debug) \
  70                 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
  71                        (ls)->ls_name , ##args); \
  72 } while (0)
  73
  74 #define DLM_ASSERT(x, do) \
  75 { \
  76   if (!(x)) \
  77   { \
  78     printk(KERN_ERR "\nDLM:  Assertion failed on line %d of file %s\n" \
  79                "DLM:  assertion:  \"%s\"\n" \
  80                "DLM:  time = %lu\n", \
  81                __LINE__, __FILE__, #x, jiffies); \
  82     {do} \
  83     printk("\n"); \
  84     BUG(); \
  85     panic("DLM:  Record message above and reboot.\n"); \
  86   } \
  87 }
  88
  89
  90 struct dlm_direntry {
  91         struct list_head        list;
  92         uint32_t                master_nodeid;
  93         uint16_t                length;
  94         char                    name[1];
  95 };
  96
  97 struct dlm_dirtable {
  98         struct list_head        list;
  99         spinlock_t              lock;
 100 };
 101
 102 struct dlm_rsbtable {
 103         struct list_head        list;
 104         struct list_head        toss;
 105         spinlock_t              lock;
 106 };
 107
 108 struct dlm_lkbtable {
 109         struct list_head        list;
 110         rwlock_t                lock;
 111         uint16_t                counter;
 112 };
 113
 114 /*
 115  * Lockspace member (per node in a ls)
 116  */
 117
 118 struct dlm_member {
 119         struct list_head        list;
 120         int                     nodeid;
 121         int                     weight;
 122 };
 123
 124 /*
 125  * Save and manage recovery state for a lockspace.
 126  */
 127
 128 struct dlm_recover {
 129         struct list_head        list;
 130         int                     *nodeids;   /* nodeids of all members */
 131         int                     node_count;
 132         int                     *new;       /* nodeids of new members */
 133         int                     new_count;
 134         uint64_t                seq;
 135 };
 136
 137 /*
 138  * Pass input args to second stage locking function.
 139  */
 140
 141 struct dlm_args {
 142         uint32_t                flags;
 143         void                    (*astfn) (void *astparam);
 144         void                    *astparam;
 145         void                    (*bastfn) (void *astparam, int mode);
 146         int                     mode;
 147         struct dlm_lksb         *lksb;
 148         unsigned long           timeout;
 149 };
 150
 151
 152 /*
 153  * Lock block
 154  *
 155  * A lock can be one of three types:
 156  *
 157  * local copy      lock is mastered locally
 158  *                 (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
 159  * process copy    lock is mastered on a remote node
 160  *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
 161  * master copy     master node's copy of a lock owned by remote node
 162  *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
 163  *
 164  * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
 165  * dlm_unlock.  The dlm does not modify these or use any private flags in
 166  * this field; it only contains DLM_LKF_ flags from dlm.h.  These flags
 167  * are sent as-is to the remote master when the lock is remote.
 168  *
 169  * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
 170  * Some internal flags are shared between the master and process nodes;
 171  * these shared flags are kept in the lower two bytes.  One of these
 172  * flags set on the master copy will be propagated to the process copy
 173  * and v.v.  Other internal flags are private to the master or process
 174  * node (e.g. DLM_IFL_MSTCPY).  These are kept in the high two bytes.
 175  *
 176  * lkb_sbflags: status block flags.  These flags are copied directly into
 177  * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
 178  * ast.  All defined in dlm.h with DLM_SBF_ prefix.
 179  *
 180  * lkb_status: the lock status indicates which rsb queue the lock is
 181  * on, grant, convert, or wait.  DLM_LKSTS_ WAITING/GRANTED/CONVERT
 182  *
 183  * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
 184  * reply is needed.  Only set when the lkb is on the lockspace waiters
 185  * list awaiting a reply from a remote node.
 186  *
 187  * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
 188  * is a master copy, nodeid specifies the remote lock holder, when the
 189  * lkb is a process copy, the nodeid specifies the lock master.
 190  */
 191
 192 /* lkb_ast_type */
 193
 194 #define AST_COMP                1
 195 #define AST_BAST                2
 196
 197 /* lkb_status */
 198
 199 #define DLM_LKSTS_WAITING       1
 200 #define DLM_LKSTS_GRANTED       2
 201 #define DLM_LKSTS_CONVERT       3
 202
 203 /* lkb_flags */
 204
 205 #define DLM_IFL_MSTCPY          0x00010000
 206 #define DLM_IFL_RESEND          0x00020000
 207 #define DLM_IFL_DEAD            0x00040000
 208 #define DLM_IFL_OVERLAP_UNLOCK  0x00080000
 209 #define DLM_IFL_OVERLAP_CANCEL  0x00100000
 210 #define DLM_IFL_ENDOFLIFE       0x00200000
 211 #define DLM_IFL_WATCH_TIMEWARN  0x00400000
 212 #define DLM_IFL_TIMEOUT_CANCEL  0x00800000
 213 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000
 214 #define DLM_IFL_USER            0x00000001
 215 #define DLM_IFL_ORPHAN          0x00000002
 216
 217 struct dlm_lkb {
 218         struct dlm_rsb          *lkb_resource;  /* the rsb */
 219         struct kref             lkb_ref;
 220         int                     lkb_nodeid;     /* copied from rsb */
 221         int                     lkb_ownpid;     /* pid of lock owner */
 222         uint32_t                lkb_id;         /* our lock ID */
 223         uint32_t                lkb_remid;      /* lock ID on remote partner */
 224         uint32_t                lkb_exflags;    /* external flags from caller */
 225         uint32_t                lkb_sbflags;    /* lksb flags */
 226         uint32_t                lkb_flags;      /* internal flags */
 227         uint32_t                lkb_lvbseq;     /* lvb sequence number */
 228
 229         int8_t                  lkb_status;     /* granted, waiting, convert */
 230         int8_t                  lkb_rqmode;     /* requested lock mode */
 231         int8_t                  lkb_grmode;     /* granted lock mode */
 232         int8_t                  lkb_highbast;   /* highest mode bast sent for */
 233
 234         int8_t                  lkb_wait_type;  /* type of reply waiting for */
 235         int8_t                  lkb_wait_count;
 236         int8_t                  lkb_ast_type;   /* type of ast queued for */
 237         int8_t                  lkb_ast_first;  /* type of first ast queued */
 238
 239         int8_t                  lkb_bastmode;   /* req mode of queued bast */
 240         int8_t                  lkb_castmode;   /* gr mode of queued cast */
 241         int8_t                  lkb_bastmode_done; /* last delivered bastmode */
 242         int8_t                  lkb_castmode_done; /* last delivered castmode */
 243
 244         struct list_head        lkb_idtbl_list; /* lockspace lkbtbl */
 245         struct list_head        lkb_statequeue; /* rsb g/c/w list */
 246         struct list_head        lkb_rsb_lookup; /* waiting for rsb lookup */
 247         struct list_head        lkb_wait_reply; /* waiting for remote reply */
 248         struct list_head        lkb_astqueue;   /* need ast to be sent */
 249         struct list_head        lkb_ownqueue;   /* list of locks for a process */
 250         struct list_head        lkb_time_list;
 251         ktime_t                 lkb_time_bast;  /* for debugging */
 252         ktime_t                 lkb_timestamp;
 253         unsigned long           lkb_timeout_cs;
 254
 255         char                    *lkb_lvbptr;
 256         struct dlm_lksb         *lkb_lksb;      /* caller's status block */
 257         void                    (*lkb_astfn) (void *astparam);
 258         void                    (*lkb_bastfn) (void *astparam, int mode);
 259         union {
 260                 void                    *lkb_astparam;  /* caller's ast arg */
 261                 struct dlm_user_args    *lkb_ua;
 262         };
 263 };
 264
 265
 266 struct dlm_rsb {
 267         struct dlm_ls           *res_ls;        /* the lockspace */
 268         struct kref             res_ref;
 269         struct mutex            res_mutex;
 270         unsigned long           res_flags;
 271         int                     res_length;     /* length of rsb name */
 272         int                     res_nodeid;
 273         uint32_t                res_lvbseq;
 274         uint32_t                res_hash;
 275         uint32_t                res_bucket;     /* rsbtbl */
 276         unsigned long           res_toss_time;
 277         uint32_t                res_first_lkid;
 278         struct list_head        res_lookup;     /* lkbs waiting on first */
 279         struct list_head        res_hashchain;  /* rsbtbl */
 280         struct list_head        res_grantqueue;
 281         struct list_head        res_convertqueue;
 282         struct list_head        res_waitqueue;
 283
 284         struct list_head        res_root_list;      /* used for recovery */
 285         struct list_head        res_recover_list;   /* used for recovery */
 286         int                     res_recover_locks_count;
 287
 288         char                    *res_lvbptr;
 289         char                    res_name[1];
 290 };
 291
 292 /* find_rsb() flags */
 293
 294 #define R_MASTER                1       /* only return rsb if it's a master */
 295 #define R_CREATE                2       /* create/add rsb if not found */
 296
 297 /* rsb_flags */
 298
 299 enum rsb_flags {
 300         RSB_MASTER_UNCERTAIN,
 301         RSB_VALNOTVALID,
 302         RSB_VALNOTVALID_PREV,
 303         RSB_NEW_MASTER,
 304         RSB_NEW_MASTER2,
 305         RSB_RECOVER_CONVERT,
 306         RSB_LOCKS_PURGED,
 307 };
 308
 309 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
 310 {
 311         __set_bit(flag, &r->res_flags);
 312 }
 313
 314 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
 315 {
 316         __clear_bit(flag, &r->res_flags);
 317 }
 318
 319 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
 320 {
 321         return test_bit(flag, &r->res_flags);
 322 }
 323
 324
 325 /* dlm_header is first element of all structs sent between nodes */
 326
 327 #define DLM_HEADER_MAJOR        0x00030000
 328 #define DLM_HEADER_MINOR        0x00000000
 329
 330 #define DLM_MSG                 1
 331 #define DLM_RCOM                2
 332
 333 struct dlm_header {
 334         uint32_t                h_version;
 335         uint32_t                h_lockspace;
 336         uint32_t                h_nodeid;       /* nodeid of sender */
 337         uint16_t                h_length;
 338         uint8_t                 h_cmd;          /* DLM_MSG, DLM_RCOM */
 339         uint8_t                 h_pad;
 340 };
 341
 342
 343 #define DLM_MSG_REQUEST         1
 344 #define DLM_MSG_CONVERT         2
 345 #define DLM_MSG_UNLOCK          3
 346 #define DLM_MSG_CANCEL          4
 347 #define DLM_MSG_REQUEST_REPLY   5
 348 #define DLM_MSG_CONVERT_REPLY   6
 349 #define DLM_MSG_UNLOCK_REPLY    7
 350 #define DLM_MSG_CANCEL_REPLY    8
 351 #define DLM_MSG_GRANT           9
 352 #define DLM_MSG_BAST            10
 353 #define DLM_MSG_LOOKUP          11
 354 #define DLM_MSG_REMOVE          12
 355 #define DLM_MSG_LOOKUP_REPLY    13
 356 #define DLM_MSG_PURGE           14
 357
 358 struct dlm_message {
 359         struct dlm_header       m_header;
 360         uint32_t                m_type;         /* DLM_MSG_ */
 361         uint32_t                m_nodeid;
 362         uint32_t                m_pid;
 363         uint32_t                m_lkid;         /* lkid on sender */
 364         uint32_t                m_remid;        /* lkid on receiver */
 365         uint32_t                m_parent_lkid;
 366         uint32_t                m_parent_remid;
 367         uint32_t                m_exflags;
 368         uint32_t                m_sbflags;
 369         uint32_t                m_flags;
 370         uint32_t                m_lvbseq;
 371         uint32_t                m_hash;
 372         int                     m_status;
 373         int                     m_grmode;
 374         int                     m_rqmode;
 375         int                     m_bastmode;
 376         int                     m_asts;
 377         int                     m_result;       /* 0 or -EXXX */
 378         char                    m_extra[0];     /* name or lvb */
 379 };
 380
 381
 382 #define DLM_RS_NODES            0x00000001
 383 #define DLM_RS_NODES_ALL        0x00000002
 384 #define DLM_RS_DIR              0x00000004
 385 #define DLM_RS_DIR_ALL          0x00000008
 386 #define DLM_RS_LOCKS            0x00000010
 387 #define DLM_RS_LOCKS_ALL        0x00000020
 388 #define DLM_RS_DONE             0x00000040
 389 #define DLM_RS_DONE_ALL         0x00000080
 390
 391 #define DLM_RCOM_STATUS         1
 392 #define DLM_RCOM_NAMES          2
 393 #define DLM_RCOM_LOOKUP         3
 394 #define DLM_RCOM_LOCK           4
 395 #define DLM_RCOM_STATUS_REPLY   5
 396 #define DLM_RCOM_NAMES_REPLY    6
 397 #define DLM_RCOM_LOOKUP_REPLY   7
 398 #define DLM_RCOM_LOCK_REPLY     8
 399
 400 struct dlm_rcom {
 401         struct dlm_header       rc_header;
 402         uint32_t                rc_type;        /* DLM_RCOM_ */
 403         int                     rc_result;      /* multi-purpose */
 404         uint64_t                rc_id;          /* match reply with request */
 405         uint64_t                rc_seq;         /* sender's ls_recover_seq */
 406         uint64_t                rc_seq_reply;   /* remote ls_recover_seq */
 407         char                    rc_buf[0];
 408 };
 409
 410 union dlm_packet {
 411         struct dlm_header       header;         /* common to other two */
 412         struct dlm_message      message;
 413         struct dlm_rcom         rcom;
 414 };
 415
 416 struct rcom_config {
 417         __le32                  rf_lvblen;
 418         __le32                  rf_lsflags;
 419         __le64                  rf_unused;
 420 };
 421
 422 struct rcom_lock {
 423         __le32                  rl_ownpid;
 424         __le32                  rl_lkid;
 425         __le32                  rl_remid;
 426         __le32                  rl_parent_lkid;
 427         __le32                  rl_parent_remid;
 428         __le32                  rl_exflags;
 429         __le32                  rl_flags;
 430         __le32                  rl_lvbseq;
 431         __le32                  rl_result;
 432         int8_t                  rl_rqmode;
 433         int8_t                  rl_grmode;
 434         int8_t                  rl_status;
 435         int8_t                  rl_asts;
 436         __le16                  rl_wait_type;
 437         __le16                  rl_namelen;
 438         char                    rl_name[DLM_RESNAME_MAXLEN];
 439         char                    rl_lvb[0];
 440 };
 441
 442 struct dlm_ls {
 443         struct list_head        ls_list;        /* list of lockspaces */
 444         dlm_lockspace_t         *ls_local_handle;
 445         uint32_t                ls_global_id;   /* global unique lockspace ID */
 446         uint32_t                ls_exflags;
 447         int                     ls_lvblen;
 448         int                     ls_count;       /* refcount of processes in
 449                                                    the dlm using this ls */
 450         int                     ls_create_count; /* create/release refcount */
 451         unsigned long           ls_flags;       /* LSFL_ */
 452         unsigned long           ls_scan_time;
 453         struct kobject          ls_kobj;
 454
 455         struct dlm_rsbtable     *ls_rsbtbl;
 456         uint32_t                ls_rsbtbl_size;
 457
 458         struct dlm_lkbtable     *ls_lkbtbl;
 459         uint32_t                ls_lkbtbl_size;
 460
 461         struct dlm_dirtable     *ls_dirtbl;
 462         uint32_t                ls_dirtbl_size;
 463
 464         struct mutex            ls_waiters_mutex;
 465         struct list_head        ls_waiters;     /* lkbs needing a reply */
 466
 467         struct mutex            ls_orphans_mutex;
 468         struct list_head        ls_orphans;
 469
 470         struct mutex            ls_timeout_mutex;
 471         struct list_head        ls_timeout;
 472
 473         struct list_head        ls_nodes;       /* current nodes in ls */
 474         struct list_head        ls_nodes_gone;  /* dead node list, recovery */
 475         int                     ls_num_nodes;   /* number of nodes in ls */
 476         int                     ls_low_nodeid;
 477         int                     ls_total_weight;
 478         int                     *ls_node_array;
 479
 480         struct dlm_rsb          ls_stub_rsb;    /* for returning errors */
 481         struct dlm_lkb          ls_stub_lkb;    /* for returning errors */
 482         struct dlm_message      ls_stub_ms;     /* for faking a reply */
 483
 484         struct dentry           *ls_debug_rsb_dentry; /* debugfs */
 485         struct dentry           *ls_debug_waiters_dentry; /* debugfs */
 486         struct dentry           *ls_debug_locks_dentry; /* debugfs */
 487         struct dentry           *ls_debug_all_dentry; /* debugfs */
 488
 489         wait_queue_head_t       ls_uevent_wait; /* user part of join/leave */
 490         int                     ls_uevent_result;
 491         struct completion       ls_members_done;
 492         int                     ls_members_result;
 493
 494         struct miscdevice       ls_device;
 495
 496         /* recovery related */
 497
 498         struct timer_list       ls_timer;
 499         struct task_struct      *ls_recoverd_task;
 500         struct mutex            ls_recoverd_active;
 501         spinlock_t              ls_recover_lock;
 502         unsigned long           ls_recover_begin; /* jiffies timestamp */
 503         uint32_t                ls_recover_status; /* DLM_RS_ */
 504         uint64_t                ls_recover_seq;
 505         struct dlm_recover      *ls_recover_args;
 506         struct rw_semaphore     ls_in_recovery; /* block local requests */
 507         struct rw_semaphore     ls_recv_active; /* block dlm_recv */
 508         struct list_head        ls_requestqueue;/* queue remote requests */
 509         struct mutex            ls_requestqueue_mutex;
 510         struct dlm_rcom         *ls_recover_buf;
 511         int                     ls_recover_nodeid; /* for debugging */
 512         uint64_t                ls_rcom_seq;
 513         spinlock_t              ls_rcom_spin;
 514         struct list_head        ls_recover_list;
 515         spinlock_t              ls_recover_list_lock;
 516         int                     ls_recover_list_count;
 517         wait_queue_head_t       ls_wait_general;
 518         struct mutex            ls_clear_proc_locks;
 519
 520         struct list_head        ls_root_list;   /* root resources */
 521         struct rw_semaphore     ls_root_sem;    /* protect root_list */
 522
 523         int                     ls_namelen;
 524         char                    ls_name[1];
 525 };
 526
 527 #define LSFL_WORK               0
 528 #define LSFL_RUNNING            1
 529 #define LSFL_RECOVERY_STOP      2
 530 #define LSFL_RCOM_READY         3
 531 #define LSFL_RCOM_WAIT          4
 532 #define LSFL_UEVENT_WAIT        5
 533 #define LSFL_TIMEWARN           6
 534
 535 /* much of this is just saving user space pointers associated with the
 536    lock that we pass back to the user lib with an ast */
 537
 538 struct dlm_user_args {
 539         struct dlm_user_proc    *proc; /* each process that opens the lockspace
 540                                           device has private data
 541                                           (dlm_user_proc) on the struct file,
 542                                           the process's locks point back to it*/
 543         struct dlm_lksb         lksb;
 544         int                     old_mode;
 545         int                     update_user_lvb;
 546         struct dlm_lksb __user  *user_lksb;
 547         void __user             *castparam;
 548         void __user             *castaddr;
 549         void __user             *bastparam;
 550         void __user             *bastaddr;
 551         uint64_t                xid;
 552 };
 553
 554 #define DLM_PROC_FLAGS_CLOSING 1
 555 #define DLM_PROC_FLAGS_COMPAT  2
 556
 557 /* locks list is kept so we can remove all a process's locks when it
 558    exits (or orphan those that are persistent) */
 559
 560 struct dlm_user_proc {
 561         dlm_lockspace_t         *lockspace;
 562         unsigned long           flags; /* DLM_PROC_FLAGS */
 563         struct list_head        asts;
 564         spinlock_t              asts_spin;
 565         struct list_head        locks;
 566         spinlock_t              locks_spin;
 567         struct list_head        unlocking;
 568         wait_queue_head_t       wait;
 569 };
 570
 571 static inline int dlm_locking_stopped(struct dlm_ls *ls)
 572 {
 573         return !test_bit(LSFL_RUNNING, &ls->ls_flags);
 574 }
 575
 576 static inline int dlm_recovery_stopped(struct dlm_ls *ls)
 577 {
 578         return test_bit(LSFL_RECOVERY_STOP, &ls->ls_flags);
 579 }
 580
 581 static inline int dlm_no_directory(struct dlm_ls *ls)
 582 {
 583         return (ls->ls_exflags & DLM_LSFL_NODIR) ? 1 : 0;
 584 }
 585
 586 int dlm_netlink_init(void);
 587 void dlm_netlink_exit(void);
 588 void dlm_timeout_warn(struct dlm_lkb *lkb);
 589 int dlm_plock_init(void);
 590 void dlm_plock_exit(void);
 591
 592 #ifdef CONFIG_DLM_DEBUG
 593 int dlm_register_debugfs(void);
 594 void dlm_unregister_debugfs(void);
 595 int dlm_create_debug_file(struct dlm_ls *ls);
 596 void dlm_delete_debug_file(struct dlm_ls *ls);
 597 #else
 598 static inline int dlm_register_debugfs(void) { return 0; }
 599 static inline void dlm_unregister_debugfs(void) { }
 600 static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
 601 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
 602 #endif
 603
 604 #endif                          /* __DLM_INTERNAL_DOT_H__ */