linux/fs/dlm/dlm_internal.h
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   1/******************************************************************************
   2*******************************************************************************
   3**
   4**  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5**  Copyright (C) 2004-2011 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 <linux/idr.h>
  41#include <linux/ratelimit.h>
  42#include <asm/uaccess.h>
  43
  44#include <linux/dlm.h>
  45#include "config.h"
  46
  47/* Size of the temp buffer midcomms allocates on the stack.
  48   We try to make this large enough so most messages fit.
  49   FIXME: should sctp make this unnecessary? */
  50
  51#define DLM_INBUF_LEN           148
  52
  53struct dlm_ls;
  54struct dlm_lkb;
  55struct dlm_rsb;
  56struct dlm_member;
  57struct dlm_rsbtable;
  58struct dlm_recover;
  59struct dlm_header;
  60struct dlm_message;
  61struct dlm_rcom;
  62struct dlm_mhandle;
  63
  64#define log_print(fmt, args...) \
  65        printk(KERN_ERR "dlm: "fmt"\n" , ##args)
  66#define log_error(ls, fmt, args...) \
  67        printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
  68
  69#define log_debug(ls, fmt, args...) \
  70do { \
  71        if (dlm_config.ci_log_debug) \
  72                printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
  73                       (ls)->ls_name , ##args); \
  74} while (0)
  75
  76#define log_limit(ls, fmt, args...) \
  77do { \
  78        if (dlm_config.ci_log_debug) \
  79                printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \
  80                        (ls)->ls_name , ##args); \
  81} while (0)
  82
  83#define DLM_ASSERT(x, do) \
  84{ \
  85  if (!(x)) \
  86  { \
  87    printk(KERN_ERR "\nDLM:  Assertion failed on line %d of file %s\n" \
  88               "DLM:  assertion:  \"%s\"\n" \
  89               "DLM:  time = %lu\n", \
  90               __LINE__, __FILE__, #x, jiffies); \
  91    {do} \
  92    printk("\n"); \
  93    BUG(); \
  94    panic("DLM:  Record message above and reboot.\n"); \
  95  } \
  96}
  97
  98
  99struct dlm_rsbtable {
 100        struct rb_root          keep;
 101        struct rb_root          toss;
 102        spinlock_t              lock;
 103};
 104
 105
 106/*
 107 * Lockspace member (per node in a ls)
 108 */
 109
 110struct dlm_member {
 111        struct list_head        list;
 112        int                     nodeid;
 113        int                     weight;
 114        int                     slot;
 115        int                     slot_prev;
 116        int                     comm_seq;
 117        uint32_t                generation;
 118};
 119
 120/*
 121 * Save and manage recovery state for a lockspace.
 122 */
 123
 124struct dlm_recover {
 125        struct list_head        list;
 126        struct dlm_config_node  *nodes;
 127        int                     nodes_count;
 128        uint64_t                seq;
 129};
 130
 131/*
 132 * Pass input args to second stage locking function.
 133 */
 134
 135struct dlm_args {
 136        uint32_t                flags;
 137        void                    (*astfn) (void *astparam);
 138        void                    *astparam;
 139        void                    (*bastfn) (void *astparam, int mode);
 140        int                     mode;
 141        struct dlm_lksb         *lksb;
 142        unsigned long           timeout;
 143};
 144
 145
 146/*
 147 * Lock block
 148 *
 149 * A lock can be one of three types:
 150 *
 151 * local copy      lock is mastered locally
 152 *                 (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
 153 * process copy    lock is mastered on a remote node
 154 *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
 155 * master copy     master node's copy of a lock owned by remote node
 156 *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
 157 *
 158 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
 159 * dlm_unlock.  The dlm does not modify these or use any private flags in
 160 * this field; it only contains DLM_LKF_ flags from dlm.h.  These flags
 161 * are sent as-is to the remote master when the lock is remote.
 162 *
 163 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
 164 * Some internal flags are shared between the master and process nodes;
 165 * these shared flags are kept in the lower two bytes.  One of these
 166 * flags set on the master copy will be propagated to the process copy
 167 * and v.v.  Other internal flags are private to the master or process
 168 * node (e.g. DLM_IFL_MSTCPY).  These are kept in the high two bytes.
 169 *
 170 * lkb_sbflags: status block flags.  These flags are copied directly into
 171 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
 172 * ast.  All defined in dlm.h with DLM_SBF_ prefix.
 173 *
 174 * lkb_status: the lock status indicates which rsb queue the lock is
 175 * on, grant, convert, or wait.  DLM_LKSTS_ WAITING/GRANTED/CONVERT
 176 *
 177 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
 178 * reply is needed.  Only set when the lkb is on the lockspace waiters
 179 * list awaiting a reply from a remote node.
 180 *
 181 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
 182 * is a master copy, nodeid specifies the remote lock holder, when the
 183 * lkb is a process copy, the nodeid specifies the lock master.
 184 */
 185
 186/* lkb_status */
 187
 188#define DLM_LKSTS_WAITING       1
 189#define DLM_LKSTS_GRANTED       2
 190#define DLM_LKSTS_CONVERT       3
 191
 192/* lkb_flags */
 193
 194#define DLM_IFL_MSTCPY          0x00010000
 195#define DLM_IFL_RESEND          0x00020000
 196#define DLM_IFL_DEAD            0x00040000
 197#define DLM_IFL_OVERLAP_UNLOCK  0x00080000
 198#define DLM_IFL_OVERLAP_CANCEL  0x00100000
 199#define DLM_IFL_ENDOFLIFE       0x00200000
 200#define DLM_IFL_WATCH_TIMEWARN  0x00400000
 201#define DLM_IFL_TIMEOUT_CANCEL  0x00800000
 202#define DLM_IFL_DEADLOCK_CANCEL 0x01000000
 203#define DLM_IFL_STUB_MS         0x02000000 /* magic number for m_flags */
 204#define DLM_IFL_USER            0x00000001
 205#define DLM_IFL_ORPHAN          0x00000002
 206
 207#define DLM_CALLBACKS_SIZE      6
 208
 209#define DLM_CB_CAST             0x00000001
 210#define DLM_CB_BAST             0x00000002
 211#define DLM_CB_SKIP             0x00000004
 212
 213struct dlm_callback {
 214        uint64_t                seq;
 215        uint32_t                flags;          /* DLM_CBF_ */
 216        int                     sb_status;      /* copy to lksb status */
 217        uint8_t                 sb_flags;       /* copy to lksb flags */
 218        int8_t                  mode; /* rq mode of bast, gr mode of cast */
 219};
 220
 221struct dlm_lkb {
 222        struct dlm_rsb          *lkb_resource;  /* the rsb */
 223        struct kref             lkb_ref;
 224        int                     lkb_nodeid;     /* copied from rsb */
 225        int                     lkb_ownpid;     /* pid of lock owner */
 226        uint32_t                lkb_id;         /* our lock ID */
 227        uint32_t                lkb_remid;      /* lock ID on remote partner */
 228        uint32_t                lkb_exflags;    /* external flags from caller */
 229        uint32_t                lkb_sbflags;    /* lksb flags */
 230        uint32_t                lkb_flags;      /* internal flags */
 231        uint32_t                lkb_lvbseq;     /* lvb sequence number */
 232
 233        int8_t                  lkb_status;     /* granted, waiting, convert */
 234        int8_t                  lkb_rqmode;     /* requested lock mode */
 235        int8_t                  lkb_grmode;     /* granted lock mode */
 236        int8_t                  lkb_highbast;   /* highest mode bast sent for */
 237
 238        int8_t                  lkb_wait_type;  /* type of reply waiting for */
 239        int8_t                  lkb_wait_count;
 240        int                     lkb_wait_nodeid; /* for debugging */
 241
 242        struct list_head        lkb_statequeue; /* rsb g/c/w list */
 243        struct list_head        lkb_rsb_lookup; /* waiting for rsb lookup */
 244        struct list_head        lkb_wait_reply; /* waiting for remote reply */
 245        struct list_head        lkb_ownqueue;   /* list of locks for a process */
 246        struct list_head        lkb_time_list;
 247        ktime_t                 lkb_timestamp;
 248        ktime_t                 lkb_wait_time;
 249        unsigned long           lkb_timeout_cs;
 250
 251        struct mutex            lkb_cb_mutex;
 252        struct work_struct      lkb_cb_work;
 253        struct list_head        lkb_cb_list; /* for ls_cb_delay or proc->asts */
 254        struct dlm_callback     lkb_callbacks[DLM_CALLBACKS_SIZE];
 255        struct dlm_callback     lkb_last_cast;
 256        struct dlm_callback     lkb_last_bast;
 257        ktime_t                 lkb_last_cast_time;     /* for debugging */
 258        ktime_t                 lkb_last_bast_time;     /* for debugging */
 259
 260        uint64_t                lkb_recover_seq; /* from ls_recover_seq */
 261
 262        char                    *lkb_lvbptr;
 263        struct dlm_lksb         *lkb_lksb;      /* caller's status block */
 264        void                    (*lkb_astfn) (void *astparam);
 265        void                    (*lkb_bastfn) (void *astparam, int mode);
 266        union {
 267                void                    *lkb_astparam;  /* caller's ast arg */
 268                struct dlm_user_args    *lkb_ua;
 269        };
 270};
 271
 272/*
 273 * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real
 274 * nodeid, even when nodeid is our_nodeid.
 275 *
 276 * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid,
 277 * greater than zero when another nodeid.
 278 *
 279 * (TODO: remove res_nodeid and only use res_master_nodeid)
 280 */
 281
 282struct dlm_rsb {
 283        struct dlm_ls           *res_ls;        /* the lockspace */
 284        struct kref             res_ref;
 285        struct mutex            res_mutex;
 286        unsigned long           res_flags;
 287        int                     res_length;     /* length of rsb name */
 288        int                     res_nodeid;
 289        int                     res_master_nodeid;
 290        int                     res_dir_nodeid;
 291        int                     res_id;         /* for ls_recover_idr */
 292        uint32_t                res_lvbseq;
 293        uint32_t                res_hash;
 294        uint32_t                res_bucket;     /* rsbtbl */
 295        unsigned long           res_toss_time;
 296        uint32_t                res_first_lkid;
 297        struct list_head        res_lookup;     /* lkbs waiting on first */
 298        union {
 299                struct list_head        res_hashchain;
 300                struct rb_node          res_hashnode;   /* rsbtbl */
 301        };
 302        struct list_head        res_grantqueue;
 303        struct list_head        res_convertqueue;
 304        struct list_head        res_waitqueue;
 305
 306        struct list_head        res_root_list;      /* used for recovery */
 307        struct list_head        res_recover_list;   /* used for recovery */
 308        int                     res_recover_locks_count;
 309
 310        char                    *res_lvbptr;
 311        char                    res_name[DLM_RESNAME_MAXLEN+1];
 312};
 313
 314/* dlm_master_lookup() flags */
 315
 316#define DLM_LU_RECOVER_DIR      1
 317#define DLM_LU_RECOVER_MASTER   2
 318
 319/* dlm_master_lookup() results */
 320
 321#define DLM_LU_MATCH            1
 322#define DLM_LU_ADD              2
 323
 324/* find_rsb() flags */
 325
 326#define R_REQUEST               0x00000001
 327#define R_RECEIVE_REQUEST       0x00000002
 328#define R_RECEIVE_RECOVER       0x00000004
 329
 330/* rsb_flags */
 331
 332enum rsb_flags {
 333        RSB_MASTER_UNCERTAIN,
 334        RSB_VALNOTVALID,
 335        RSB_VALNOTVALID_PREV,
 336        RSB_NEW_MASTER,
 337        RSB_NEW_MASTER2,
 338        RSB_RECOVER_CONVERT,
 339        RSB_RECOVER_GRANT,
 340};
 341
 342static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
 343{
 344        __set_bit(flag, &r->res_flags);
 345}
 346
 347static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
 348{
 349        __clear_bit(flag, &r->res_flags);
 350}
 351
 352static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
 353{
 354        return test_bit(flag, &r->res_flags);
 355}
 356
 357
 358/* dlm_header is first element of all structs sent between nodes */
 359
 360#define DLM_HEADER_MAJOR        0x00030000
 361#define DLM_HEADER_MINOR        0x00000001
 362
 363#define DLM_HEADER_SLOTS        0x00000001
 364
 365#define DLM_MSG                 1
 366#define DLM_RCOM                2
 367
 368struct dlm_header {
 369        uint32_t                h_version;
 370        uint32_t                h_lockspace;
 371        uint32_t                h_nodeid;       /* nodeid of sender */
 372        uint16_t                h_length;
 373        uint8_t                 h_cmd;          /* DLM_MSG, DLM_RCOM */
 374        uint8_t                 h_pad;
 375};
 376
 377
 378#define DLM_MSG_REQUEST         1
 379#define DLM_MSG_CONVERT         2
 380#define DLM_MSG_UNLOCK          3
 381#define DLM_MSG_CANCEL          4
 382#define DLM_MSG_REQUEST_REPLY   5
 383#define DLM_MSG_CONVERT_REPLY   6
 384#define DLM_MSG_UNLOCK_REPLY    7
 385#define DLM_MSG_CANCEL_REPLY    8
 386#define DLM_MSG_GRANT           9
 387#define DLM_MSG_BAST            10
 388#define DLM_MSG_LOOKUP          11
 389#define DLM_MSG_REMOVE          12
 390#define DLM_MSG_LOOKUP_REPLY    13
 391#define DLM_MSG_PURGE           14
 392
 393struct dlm_message {
 394        struct dlm_header       m_header;
 395        uint32_t                m_type;         /* DLM_MSG_ */
 396        uint32_t                m_nodeid;
 397        uint32_t                m_pid;
 398        uint32_t                m_lkid;         /* lkid on sender */
 399        uint32_t                m_remid;        /* lkid on receiver */
 400        uint32_t                m_parent_lkid;
 401        uint32_t                m_parent_remid;
 402        uint32_t                m_exflags;
 403        uint32_t                m_sbflags;
 404        uint32_t                m_flags;
 405        uint32_t                m_lvbseq;
 406        uint32_t                m_hash;
 407        int                     m_status;
 408        int                     m_grmode;
 409        int                     m_rqmode;
 410        int                     m_bastmode;
 411        int                     m_asts;
 412        int                     m_result;       /* 0 or -EXXX */
 413        char                    m_extra[0];     /* name or lvb */
 414};
 415
 416
 417#define DLM_RS_NODES            0x00000001
 418#define DLM_RS_NODES_ALL        0x00000002
 419#define DLM_RS_DIR              0x00000004
 420#define DLM_RS_DIR_ALL          0x00000008
 421#define DLM_RS_LOCKS            0x00000010
 422#define DLM_RS_LOCKS_ALL        0x00000020
 423#define DLM_RS_DONE             0x00000040
 424#define DLM_RS_DONE_ALL         0x00000080
 425
 426#define DLM_RCOM_STATUS         1
 427#define DLM_RCOM_NAMES          2
 428#define DLM_RCOM_LOOKUP         3
 429#define DLM_RCOM_LOCK           4
 430#define DLM_RCOM_STATUS_REPLY   5
 431#define DLM_RCOM_NAMES_REPLY    6
 432#define DLM_RCOM_LOOKUP_REPLY   7
 433#define DLM_RCOM_LOCK_REPLY     8
 434
 435struct dlm_rcom {
 436        struct dlm_header       rc_header;
 437        uint32_t                rc_type;        /* DLM_RCOM_ */
 438        int                     rc_result;      /* multi-purpose */
 439        uint64_t                rc_id;          /* match reply with request */
 440        uint64_t                rc_seq;         /* sender's ls_recover_seq */
 441        uint64_t                rc_seq_reply;   /* remote ls_recover_seq */
 442        char                    rc_buf[0];
 443};
 444
 445union dlm_packet {
 446        struct dlm_header       header;         /* common to other two */
 447        struct dlm_message      message;
 448        struct dlm_rcom         rcom;
 449};
 450
 451#define DLM_RSF_NEED_SLOTS      0x00000001
 452
 453/* RCOM_STATUS data */
 454struct rcom_status {
 455        __le32                  rs_flags;
 456        __le32                  rs_unused1;
 457        __le64                  rs_unused2;
 458};
 459
 460/* RCOM_STATUS_REPLY data */
 461struct rcom_config {
 462        __le32                  rf_lvblen;
 463        __le32                  rf_lsflags;
 464
 465        /* DLM_HEADER_SLOTS adds: */
 466        __le32                  rf_flags;
 467        __le16                  rf_our_slot;
 468        __le16                  rf_num_slots;
 469        __le32                  rf_generation;
 470        __le32                  rf_unused1;
 471        __le64                  rf_unused2;
 472};
 473
 474struct rcom_slot {
 475        __le32                  ro_nodeid;
 476        __le16                  ro_slot;
 477        __le16                  ro_unused1;
 478        __le64                  ro_unused2;
 479};
 480
 481struct rcom_lock {
 482        __le32                  rl_ownpid;
 483        __le32                  rl_lkid;
 484        __le32                  rl_remid;
 485        __le32                  rl_parent_lkid;
 486        __le32                  rl_parent_remid;
 487        __le32                  rl_exflags;
 488        __le32                  rl_flags;
 489        __le32                  rl_lvbseq;
 490        __le32                  rl_result;
 491        int8_t                  rl_rqmode;
 492        int8_t                  rl_grmode;
 493        int8_t                  rl_status;
 494        int8_t                  rl_asts;
 495        __le16                  rl_wait_type;
 496        __le16                  rl_namelen;
 497        char                    rl_name[DLM_RESNAME_MAXLEN];
 498        char                    rl_lvb[0];
 499};
 500
 501/*
 502 * The max number of resources per rsbtbl bucket that shrink will attempt
 503 * to remove in each iteration.
 504 */
 505
 506#define DLM_REMOVE_NAMES_MAX 8
 507
 508struct dlm_ls {
 509        struct list_head        ls_list;        /* list of lockspaces */
 510        dlm_lockspace_t         *ls_local_handle;
 511        uint32_t                ls_global_id;   /* global unique lockspace ID */
 512        uint32_t                ls_generation;
 513        uint32_t                ls_exflags;
 514        int                     ls_lvblen;
 515        int                     ls_count;       /* refcount of processes in
 516                                                   the dlm using this ls */
 517        int                     ls_create_count; /* create/release refcount */
 518        unsigned long           ls_flags;       /* LSFL_ */
 519        unsigned long           ls_scan_time;
 520        struct kobject          ls_kobj;
 521
 522        struct idr              ls_lkbidr;
 523        spinlock_t              ls_lkbidr_spin;
 524
 525        struct dlm_rsbtable     *ls_rsbtbl;
 526        uint32_t                ls_rsbtbl_size;
 527
 528        struct mutex            ls_waiters_mutex;
 529        struct list_head        ls_waiters;     /* lkbs needing a reply */
 530
 531        struct mutex            ls_orphans_mutex;
 532        struct list_head        ls_orphans;
 533
 534        struct mutex            ls_timeout_mutex;
 535        struct list_head        ls_timeout;
 536
 537        spinlock_t              ls_new_rsb_spin;
 538        int                     ls_new_rsb_count;
 539        struct list_head        ls_new_rsb;     /* new rsb structs */
 540
 541        spinlock_t              ls_remove_spin;
 542        char                    ls_remove_name[DLM_RESNAME_MAXLEN+1];
 543        char                    *ls_remove_names[DLM_REMOVE_NAMES_MAX];
 544        int                     ls_remove_len;
 545        int                     ls_remove_lens[DLM_REMOVE_NAMES_MAX];
 546
 547        struct list_head        ls_nodes;       /* current nodes in ls */
 548        struct list_head        ls_nodes_gone;  /* dead node list, recovery */
 549        int                     ls_num_nodes;   /* number of nodes in ls */
 550        int                     ls_low_nodeid;
 551        int                     ls_total_weight;
 552        int                     *ls_node_array;
 553
 554        int                     ls_slot;
 555        int                     ls_num_slots;
 556        int                     ls_slots_size;
 557        struct dlm_slot         *ls_slots;
 558
 559        struct dlm_rsb          ls_stub_rsb;    /* for returning errors */
 560        struct dlm_lkb          ls_stub_lkb;    /* for returning errors */
 561        struct dlm_message      ls_stub_ms;     /* for faking a reply */
 562
 563        struct dentry           *ls_debug_rsb_dentry; /* debugfs */
 564        struct dentry           *ls_debug_waiters_dentry; /* debugfs */
 565        struct dentry           *ls_debug_locks_dentry; /* debugfs */
 566        struct dentry           *ls_debug_all_dentry; /* debugfs */
 567        struct dentry           *ls_debug_toss_dentry; /* debugfs */
 568
 569        wait_queue_head_t       ls_uevent_wait; /* user part of join/leave */
 570        int                     ls_uevent_result;
 571        struct completion       ls_members_done;
 572        int                     ls_members_result;
 573
 574        struct miscdevice       ls_device;
 575
 576        struct workqueue_struct *ls_callback_wq;
 577
 578        /* recovery related */
 579
 580        struct mutex            ls_cb_mutex;
 581        struct list_head        ls_cb_delay; /* save for queue_work later */
 582        struct timer_list       ls_timer;
 583        struct task_struct      *ls_recoverd_task;
 584        struct mutex            ls_recoverd_active;
 585        spinlock_t              ls_recover_lock;
 586        unsigned long           ls_recover_begin; /* jiffies timestamp */
 587        uint32_t                ls_recover_status; /* DLM_RS_ */
 588        uint64_t                ls_recover_seq;
 589        struct dlm_recover      *ls_recover_args;
 590        struct rw_semaphore     ls_in_recovery; /* block local requests */
 591        struct rw_semaphore     ls_recv_active; /* block dlm_recv */
 592        struct list_head        ls_requestqueue;/* queue remote requests */
 593        struct mutex            ls_requestqueue_mutex;
 594        struct dlm_rcom         *ls_recover_buf;
 595        int                     ls_recover_nodeid; /* for debugging */
 596        unsigned int            ls_recover_dir_sent_res; /* for log info */
 597        unsigned int            ls_recover_dir_sent_msg; /* for log info */
 598        unsigned int            ls_recover_locks_in; /* for log info */
 599        uint64_t                ls_rcom_seq;
 600        spinlock_t              ls_rcom_spin;
 601        struct list_head        ls_recover_list;
 602        spinlock_t              ls_recover_list_lock;
 603        int                     ls_recover_list_count;
 604        struct idr              ls_recover_idr;
 605        spinlock_t              ls_recover_idr_lock;
 606        wait_queue_head_t       ls_wait_general;
 607        wait_queue_head_t       ls_recover_lock_wait;
 608        struct mutex            ls_clear_proc_locks;
 609
 610        struct list_head        ls_root_list;   /* root resources */
 611        struct rw_semaphore     ls_root_sem;    /* protect root_list */
 612
 613        const struct dlm_lockspace_ops *ls_ops;
 614        void                    *ls_ops_arg;
 615
 616        int                     ls_namelen;
 617        char                    ls_name[1];
 618};
 619
 620/*
 621 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
 622 * that they should abort what they're doing so new recovery can be started.
 623 *
 624 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
 625 * should do down_write() on the in_recovery rw_semaphore. (doing down_write
 626 * within dlm_ls_stop causes complaints about the lock acquired/released
 627 * in different contexts.)
 628 *
 629 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
 630 * It sets this after it is done with down_write() on the in_recovery
 631 * rw_semaphore and clears it after it has released the rw_semaphore.
 632 *
 633 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
 634 * should begin recovery of the lockspace.
 635 *
 636 * LSFL_RUNNING - set when normal locking activity is enabled.
 637 * dlm_ls_stop() clears this to tell dlm locking routines that they should
 638 * quit what they are doing so recovery can run.  dlm_recoverd sets
 639 * this after recovery is finished.
 640 */
 641
 642#define LSFL_RECOVER_STOP       0
 643#define LSFL_RECOVER_DOWN       1
 644#define LSFL_RECOVER_LOCK       2
 645#define LSFL_RECOVER_WORK       3
 646#define LSFL_RUNNING            4
 647
 648#define LSFL_RCOM_READY         5
 649#define LSFL_RCOM_WAIT          6
 650#define LSFL_UEVENT_WAIT        7
 651#define LSFL_TIMEWARN           8
 652#define LSFL_CB_DELAY           9
 653#define LSFL_NODIR              10
 654
 655/* much of this is just saving user space pointers associated with the
 656   lock that we pass back to the user lib with an ast */
 657
 658struct dlm_user_args {
 659        struct dlm_user_proc    *proc; /* each process that opens the lockspace
 660                                          device has private data
 661                                          (dlm_user_proc) on the struct file,
 662                                          the process's locks point back to it*/
 663        struct dlm_lksb         lksb;
 664        struct dlm_lksb __user  *user_lksb;
 665        void __user             *castparam;
 666        void __user             *castaddr;
 667        void __user             *bastparam;
 668        void __user             *bastaddr;
 669        uint64_t                xid;
 670};
 671
 672#define DLM_PROC_FLAGS_CLOSING 1
 673#define DLM_PROC_FLAGS_COMPAT  2
 674
 675/* locks list is kept so we can remove all a process's locks when it
 676   exits (or orphan those that are persistent) */
 677
 678struct dlm_user_proc {
 679        dlm_lockspace_t         *lockspace;
 680        unsigned long           flags; /* DLM_PROC_FLAGS */
 681        struct list_head        asts;
 682        spinlock_t              asts_spin;
 683        struct list_head        locks;
 684        spinlock_t              locks_spin;
 685        struct list_head        unlocking;
 686        wait_queue_head_t       wait;
 687};
 688
 689static inline int dlm_locking_stopped(struct dlm_ls *ls)
 690{
 691        return !test_bit(LSFL_RUNNING, &ls->ls_flags);
 692}
 693
 694static inline int dlm_recovery_stopped(struct dlm_ls *ls)
 695{
 696        return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
 697}
 698
 699static inline int dlm_no_directory(struct dlm_ls *ls)
 700{
 701        return test_bit(LSFL_NODIR, &ls->ls_flags);
 702}
 703
 704int dlm_netlink_init(void);
 705void dlm_netlink_exit(void);
 706void dlm_timeout_warn(struct dlm_lkb *lkb);
 707int dlm_plock_init(void);
 708void dlm_plock_exit(void);
 709
 710#ifdef CONFIG_DLM_DEBUG
 711int dlm_register_debugfs(void);
 712void dlm_unregister_debugfs(void);
 713int dlm_create_debug_file(struct dlm_ls *ls);
 714void dlm_delete_debug_file(struct dlm_ls *ls);
 715#else
 716static inline int dlm_register_debugfs(void) { return 0; }
 717static inline void dlm_unregister_debugfs(void) { }
 718static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
 719static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
 720#endif
 721
 722#endif                          /* __DLM_INTERNAL_DOT_H__ */
 723
 724
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