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
  99#define DLM_RTF_SHRINK          0x00000001
 100
 101struct dlm_rsbtable {
 102        struct rb_root          keep;
 103        struct rb_root          toss;
 104        spinlock_t              lock;
 105        uint32_t                flags;
 106};
 107
 108
 109/*
 110 * Lockspace member (per node in a ls)
 111 */
 112
 113struct dlm_member {
 114        struct list_head        list;
 115        int                     nodeid;
 116        int                     weight;
 117        int                     slot;
 118        int                     slot_prev;
 119        int                     comm_seq;
 120        uint32_t                generation;
 121};
 122
 123/*
 124 * Save and manage recovery state for a lockspace.
 125 */
 126
 127struct dlm_recover {
 128        struct list_head        list;
 129        struct dlm_config_node  *nodes;
 130        int                     nodes_count;
 131        uint64_t                seq;
 132};
 133
 134/*
 135 * Pass input args to second stage locking function.
 136 */
 137
 138struct dlm_args {
 139        uint32_t                flags;
 140        void                    (*astfn) (void *astparam);
 141        void                    *astparam;
 142        void                    (*bastfn) (void *astparam, int mode);
 143        int                     mode;
 144        struct dlm_lksb         *lksb;
 145        unsigned long           timeout;
 146};
 147
 148
 149/*
 150 * Lock block
 151 *
 152 * A lock can be one of three types:
 153 *
 154 * local copy      lock is mastered locally
 155 *                 (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
 156 * process copy    lock is mastered on a remote node
 157 *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
 158 * master copy     master node's copy of a lock owned by remote node
 159 *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
 160 *
 161 * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
 162 * dlm_unlock.  The dlm does not modify these or use any private flags in
 163 * this field; it only contains DLM_LKF_ flags from dlm.h.  These flags
 164 * are sent as-is to the remote master when the lock is remote.
 165 *
 166 * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
 167 * Some internal flags are shared between the master and process nodes;
 168 * these shared flags are kept in the lower two bytes.  One of these
 169 * flags set on the master copy will be propagated to the process copy
 170 * and v.v.  Other internal flags are private to the master or process
 171 * node (e.g. DLM_IFL_MSTCPY).  These are kept in the high two bytes.
 172 *
 173 * lkb_sbflags: status block flags.  These flags are copied directly into
 174 * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
 175 * ast.  All defined in dlm.h with DLM_SBF_ prefix.
 176 *
 177 * lkb_status: the lock status indicates which rsb queue the lock is
 178 * on, grant, convert, or wait.  DLM_LKSTS_ WAITING/GRANTED/CONVERT
 179 *
 180 * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
 181 * reply is needed.  Only set when the lkb is on the lockspace waiters
 182 * list awaiting a reply from a remote node.
 183 *
 184 * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
 185 * is a master copy, nodeid specifies the remote lock holder, when the
 186 * lkb is a process copy, the nodeid specifies the lock master.
 187 */
 188
 189/* lkb_status */
 190
 191#define DLM_LKSTS_WAITING       1
 192#define DLM_LKSTS_GRANTED       2
 193#define DLM_LKSTS_CONVERT       3
 194
 195/* lkb_flags */
 196
 197#define DLM_IFL_MSTCPY          0x00010000
 198#define DLM_IFL_RESEND          0x00020000
 199#define DLM_IFL_DEAD            0x00040000
 200#define DLM_IFL_OVERLAP_UNLOCK  0x00080000
 201#define DLM_IFL_OVERLAP_CANCEL  0x00100000
 202#define DLM_IFL_ENDOFLIFE       0x00200000
 203#define DLM_IFL_WATCH_TIMEWARN  0x00400000
 204#define DLM_IFL_TIMEOUT_CANCEL  0x00800000
 205#define DLM_IFL_DEADLOCK_CANCEL 0x01000000
 206#define DLM_IFL_STUB_MS         0x02000000 /* magic number for m_flags */
 207#define DLM_IFL_USER            0x00000001
 208#define DLM_IFL_ORPHAN          0x00000002
 209
 210#define DLM_CALLBACKS_SIZE      6
 211
 212#define DLM_CB_CAST             0x00000001
 213#define DLM_CB_BAST             0x00000002
 214#define DLM_CB_SKIP             0x00000004
 215
 216struct dlm_callback {
 217        uint64_t                seq;
 218        uint32_t                flags;          /* DLM_CBF_ */
 219        int                     sb_status;      /* copy to lksb status */
 220        uint8_t                 sb_flags;       /* copy to lksb flags */
 221        int8_t                  mode; /* rq mode of bast, gr mode of cast */
 222};
 223
 224struct dlm_lkb {
 225        struct dlm_rsb          *lkb_resource;  /* the rsb */
 226        struct kref             lkb_ref;
 227        int                     lkb_nodeid;     /* copied from rsb */
 228        int                     lkb_ownpid;     /* pid of lock owner */
 229        uint32_t                lkb_id;         /* our lock ID */
 230        uint32_t                lkb_remid;      /* lock ID on remote partner */
 231        uint32_t                lkb_exflags;    /* external flags from caller */
 232        uint32_t                lkb_sbflags;    /* lksb flags */
 233        uint32_t                lkb_flags;      /* internal flags */
 234        uint32_t                lkb_lvbseq;     /* lvb sequence number */
 235
 236        int8_t                  lkb_status;     /* granted, waiting, convert */
 237        int8_t                  lkb_rqmode;     /* requested lock mode */
 238        int8_t                  lkb_grmode;     /* granted lock mode */
 239        int8_t                  lkb_highbast;   /* highest mode bast sent for */
 240
 241        int8_t                  lkb_wait_type;  /* type of reply waiting for */
 242        int8_t                  lkb_wait_count;
 243        int                     lkb_wait_nodeid; /* for debugging */
 244
 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_ownqueue;   /* list of locks for a process */
 249        struct list_head        lkb_time_list;
 250        ktime_t                 lkb_timestamp;
 251        ktime_t                 lkb_wait_time;
 252        unsigned long           lkb_timeout_cs;
 253
 254        struct mutex            lkb_cb_mutex;
 255        struct work_struct      lkb_cb_work;
 256        struct list_head        lkb_cb_list; /* for ls_cb_delay or proc->asts */
 257        struct dlm_callback     lkb_callbacks[DLM_CALLBACKS_SIZE];
 258        struct dlm_callback     lkb_last_cast;
 259        struct dlm_callback     lkb_last_bast;
 260        ktime_t                 lkb_last_cast_time;     /* for debugging */
 261        ktime_t                 lkb_last_bast_time;     /* for debugging */
 262
 263        uint64_t                lkb_recover_seq; /* from ls_recover_seq */
 264
 265        char                    *lkb_lvbptr;
 266        struct dlm_lksb         *lkb_lksb;      /* caller's status block */
 267        void                    (*lkb_astfn) (void *astparam);
 268        void                    (*lkb_bastfn) (void *astparam, int mode);
 269        union {
 270                void                    *lkb_astparam;  /* caller's ast arg */
 271                struct dlm_user_args    *lkb_ua;
 272        };
 273};
 274
 275/*
 276 * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real
 277 * nodeid, even when nodeid is our_nodeid.
 278 *
 279 * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid,
 280 * greater than zero when another nodeid.
 281 *
 282 * (TODO: remove res_nodeid and only use res_master_nodeid)
 283 */
 284
 285struct dlm_rsb {
 286        struct dlm_ls           *res_ls;        /* the lockspace */
 287        struct kref             res_ref;
 288        struct mutex            res_mutex;
 289        unsigned long           res_flags;
 290        int                     res_length;     /* length of rsb name */
 291        int                     res_nodeid;
 292        int                     res_master_nodeid;
 293        int                     res_dir_nodeid;
 294        int                     res_id;         /* for ls_recover_idr */
 295        uint32_t                res_lvbseq;
 296        uint32_t                res_hash;
 297        uint32_t                res_bucket;     /* rsbtbl */
 298        unsigned long           res_toss_time;
 299        uint32_t                res_first_lkid;
 300        struct list_head        res_lookup;     /* lkbs waiting on first */
 301        union {
 302                struct list_head        res_hashchain;
 303                struct rb_node          res_hashnode;   /* rsbtbl */
 304        };
 305        struct list_head        res_grantqueue;
 306        struct list_head        res_convertqueue;
 307        struct list_head        res_waitqueue;
 308
 309        struct list_head        res_root_list;      /* used for recovery */
 310        struct list_head        res_recover_list;   /* used for recovery */
 311        int                     res_recover_locks_count;
 312
 313        char                    *res_lvbptr;
 314        char                    res_name[DLM_RESNAME_MAXLEN+1];
 315};
 316
 317/* dlm_master_lookup() flags */
 318
 319#define DLM_LU_RECOVER_DIR      1
 320#define DLM_LU_RECOVER_MASTER   2
 321
 322/* dlm_master_lookup() results */
 323
 324#define DLM_LU_MATCH            1
 325#define DLM_LU_ADD              2
 326
 327/* find_rsb() flags */
 328
 329#define R_REQUEST               0x00000001
 330#define R_RECEIVE_REQUEST       0x00000002
 331#define R_RECEIVE_RECOVER       0x00000004
 332
 333/* rsb_flags */
 334
 335enum rsb_flags {
 336        RSB_MASTER_UNCERTAIN,
 337        RSB_VALNOTVALID,
 338        RSB_VALNOTVALID_PREV,
 339        RSB_NEW_MASTER,
 340        RSB_NEW_MASTER2,
 341        RSB_RECOVER_CONVERT,
 342        RSB_RECOVER_GRANT,
 343        RSB_RECOVER_LVB_INVAL,
 344};
 345
 346static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
 347{
 348        __set_bit(flag, &r->res_flags);
 349}
 350
 351static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
 352{
 353        __clear_bit(flag, &r->res_flags);
 354}
 355
 356static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
 357{
 358        return test_bit(flag, &r->res_flags);
 359}
 360
 361
 362/* dlm_header is first element of all structs sent between nodes */
 363
 364#define DLM_HEADER_MAJOR        0x00030000
 365#define DLM_HEADER_MINOR        0x00000001
 366
 367#define DLM_HEADER_SLOTS        0x00000001
 368
 369#define DLM_MSG                 1
 370#define DLM_RCOM                2
 371
 372struct dlm_header {
 373        uint32_t                h_version;
 374        uint32_t                h_lockspace;
 375        uint32_t                h_nodeid;       /* nodeid of sender */
 376        uint16_t                h_length;
 377        uint8_t                 h_cmd;          /* DLM_MSG, DLM_RCOM */
 378        uint8_t                 h_pad;
 379};
 380
 381
 382#define DLM_MSG_REQUEST         1
 383#define DLM_MSG_CONVERT         2
 384#define DLM_MSG_UNLOCK          3
 385#define DLM_MSG_CANCEL          4
 386#define DLM_MSG_REQUEST_REPLY   5
 387#define DLM_MSG_CONVERT_REPLY   6
 388#define DLM_MSG_UNLOCK_REPLY    7
 389#define DLM_MSG_CANCEL_REPLY    8
 390#define DLM_MSG_GRANT           9
 391#define DLM_MSG_BAST            10
 392#define DLM_MSG_LOOKUP          11
 393#define DLM_MSG_REMOVE          12
 394#define DLM_MSG_LOOKUP_REPLY    13
 395#define DLM_MSG_PURGE           14
 396
 397struct dlm_message {
 398        struct dlm_header       m_header;
 399        uint32_t                m_type;         /* DLM_MSG_ */
 400        uint32_t                m_nodeid;
 401        uint32_t                m_pid;
 402        uint32_t                m_lkid;         /* lkid on sender */
 403        uint32_t                m_remid;        /* lkid on receiver */
 404        uint32_t                m_parent_lkid;
 405        uint32_t                m_parent_remid;
 406        uint32_t                m_exflags;
 407        uint32_t                m_sbflags;
 408        uint32_t                m_flags;
 409        uint32_t                m_lvbseq;
 410        uint32_t                m_hash;
 411        int                     m_status;
 412        int                     m_grmode;
 413        int                     m_rqmode;
 414        int                     m_bastmode;
 415        int                     m_asts;
 416        int                     m_result;       /* 0 or -EXXX */
 417        char                    m_extra[0];     /* name or lvb */
 418};
 419
 420
 421#define DLM_RS_NODES            0x00000001
 422#define DLM_RS_NODES_ALL        0x00000002
 423#define DLM_RS_DIR              0x00000004
 424#define DLM_RS_DIR_ALL          0x00000008
 425#define DLM_RS_LOCKS            0x00000010
 426#define DLM_RS_LOCKS_ALL        0x00000020
 427#define DLM_RS_DONE             0x00000040
 428#define DLM_RS_DONE_ALL         0x00000080
 429
 430#define DLM_RCOM_STATUS         1
 431#define DLM_RCOM_NAMES          2
 432#define DLM_RCOM_LOOKUP         3
 433#define DLM_RCOM_LOCK           4
 434#define DLM_RCOM_STATUS_REPLY   5
 435#define DLM_RCOM_NAMES_REPLY    6
 436#define DLM_RCOM_LOOKUP_REPLY   7
 437#define DLM_RCOM_LOCK_REPLY     8
 438
 439struct dlm_rcom {
 440        struct dlm_header       rc_header;
 441        uint32_t                rc_type;        /* DLM_RCOM_ */
 442        int                     rc_result;      /* multi-purpose */
 443        uint64_t                rc_id;          /* match reply with request */
 444        uint64_t                rc_seq;         /* sender's ls_recover_seq */
 445        uint64_t                rc_seq_reply;   /* remote ls_recover_seq */
 446        char                    rc_buf[0];
 447};
 448
 449union dlm_packet {
 450        struct dlm_header       header;         /* common to other two */
 451        struct dlm_message      message;
 452        struct dlm_rcom         rcom;
 453};
 454
 455#define DLM_RSF_NEED_SLOTS      0x00000001
 456
 457/* RCOM_STATUS data */
 458struct rcom_status {
 459        __le32                  rs_flags;
 460        __le32                  rs_unused1;
 461        __le64                  rs_unused2;
 462};
 463
 464/* RCOM_STATUS_REPLY data */
 465struct rcom_config {
 466        __le32                  rf_lvblen;
 467        __le32                  rf_lsflags;
 468
 469        /* DLM_HEADER_SLOTS adds: */
 470        __le32                  rf_flags;
 471        __le16                  rf_our_slot;
 472        __le16                  rf_num_slots;
 473        __le32                  rf_generation;
 474        __le32                  rf_unused1;
 475        __le64                  rf_unused2;
 476};
 477
 478struct rcom_slot {
 479        __le32                  ro_nodeid;
 480        __le16                  ro_slot;
 481        __le16                  ro_unused1;
 482        __le64                  ro_unused2;
 483};
 484
 485struct rcom_lock {
 486        __le32                  rl_ownpid;
 487        __le32                  rl_lkid;
 488        __le32                  rl_remid;
 489        __le32                  rl_parent_lkid;
 490        __le32                  rl_parent_remid;
 491        __le32                  rl_exflags;
 492        __le32                  rl_flags;
 493        __le32                  rl_lvbseq;
 494        __le32                  rl_result;
 495        int8_t                  rl_rqmode;
 496        int8_t                  rl_grmode;
 497        int8_t                  rl_status;
 498        int8_t                  rl_asts;
 499        __le16                  rl_wait_type;
 500        __le16                  rl_namelen;
 501        char                    rl_name[DLM_RESNAME_MAXLEN];
 502        char                    rl_lvb[0];
 503};
 504
 505/*
 506 * The max number of resources per rsbtbl bucket that shrink will attempt
 507 * to remove in each iteration.
 508 */
 509
 510#define DLM_REMOVE_NAMES_MAX 8
 511
 512struct dlm_ls {
 513        struct list_head        ls_list;        /* list of lockspaces */
 514        dlm_lockspace_t         *ls_local_handle;
 515        uint32_t                ls_global_id;   /* global unique lockspace ID */
 516        uint32_t                ls_generation;
 517        uint32_t                ls_exflags;
 518        int                     ls_lvblen;
 519        int                     ls_count;       /* refcount of processes in
 520                                                   the dlm using this ls */
 521        int                     ls_create_count; /* create/release refcount */
 522        unsigned long           ls_flags;       /* LSFL_ */
 523        unsigned long           ls_scan_time;
 524        struct kobject          ls_kobj;
 525
 526        struct idr              ls_lkbidr;
 527        spinlock_t              ls_lkbidr_spin;
 528
 529        struct dlm_rsbtable     *ls_rsbtbl;
 530        uint32_t                ls_rsbtbl_size;
 531
 532        struct mutex            ls_waiters_mutex;
 533        struct list_head        ls_waiters;     /* lkbs needing a reply */
 534
 535        struct mutex            ls_orphans_mutex;
 536        struct list_head        ls_orphans;
 537
 538        struct mutex            ls_timeout_mutex;
 539        struct list_head        ls_timeout;
 540
 541        spinlock_t              ls_new_rsb_spin;
 542        int                     ls_new_rsb_count;
 543        struct list_head        ls_new_rsb;     /* new rsb structs */
 544
 545        spinlock_t              ls_remove_spin;
 546        char                    ls_remove_name[DLM_RESNAME_MAXLEN+1];
 547        char                    *ls_remove_names[DLM_REMOVE_NAMES_MAX];
 548        int                     ls_remove_len;
 549        int                     ls_remove_lens[DLM_REMOVE_NAMES_MAX];
 550
 551        struct list_head        ls_nodes;       /* current nodes in ls */
 552        struct list_head        ls_nodes_gone;  /* dead node list, recovery */
 553        int                     ls_num_nodes;   /* number of nodes in ls */
 554        int                     ls_low_nodeid;
 555        int                     ls_total_weight;
 556        int                     *ls_node_array;
 557
 558        int                     ls_slot;
 559        int                     ls_num_slots;
 560        int                     ls_slots_size;
 561        struct dlm_slot         *ls_slots;
 562
 563        struct dlm_rsb          ls_stub_rsb;    /* for returning errors */
 564        struct dlm_lkb          ls_stub_lkb;    /* for returning errors */
 565        struct dlm_message      ls_stub_ms;     /* for faking a reply */
 566
 567        struct dentry           *ls_debug_rsb_dentry; /* debugfs */
 568        struct dentry           *ls_debug_waiters_dentry; /* debugfs */
 569        struct dentry           *ls_debug_locks_dentry; /* debugfs */
 570        struct dentry           *ls_debug_all_dentry; /* debugfs */
 571        struct dentry           *ls_debug_toss_dentry; /* debugfs */
 572
 573        wait_queue_head_t       ls_uevent_wait; /* user part of join/leave */
 574        int                     ls_uevent_result;
 575        struct completion       ls_members_done;
 576        int                     ls_members_result;
 577
 578        struct miscdevice       ls_device;
 579
 580        struct workqueue_struct *ls_callback_wq;
 581
 582        /* recovery related */
 583
 584        struct mutex            ls_cb_mutex;
 585        struct list_head        ls_cb_delay; /* save for queue_work later */
 586        struct timer_list       ls_timer;
 587        struct task_struct      *ls_recoverd_task;
 588        struct mutex            ls_recoverd_active;
 589        spinlock_t              ls_recover_lock;
 590        unsigned long           ls_recover_begin; /* jiffies timestamp */
 591        uint32_t                ls_recover_status; /* DLM_RS_ */
 592        uint64_t                ls_recover_seq;
 593        struct dlm_recover      *ls_recover_args;
 594        struct rw_semaphore     ls_in_recovery; /* block local requests */
 595        struct rw_semaphore     ls_recv_active; /* block dlm_recv */
 596        struct list_head        ls_requestqueue;/* queue remote requests */
 597        struct mutex            ls_requestqueue_mutex;
 598        struct dlm_rcom         *ls_recover_buf;
 599        int                     ls_recover_nodeid; /* for debugging */
 600        unsigned int            ls_recover_dir_sent_res; /* for log info */
 601        unsigned int            ls_recover_dir_sent_msg; /* for log info */
 602        unsigned int            ls_recover_locks_in; /* for log info */
 603        uint64_t                ls_rcom_seq;
 604        spinlock_t              ls_rcom_spin;
 605        struct list_head        ls_recover_list;
 606        spinlock_t              ls_recover_list_lock;
 607        int                     ls_recover_list_count;
 608        struct idr              ls_recover_idr;
 609        spinlock_t              ls_recover_idr_lock;
 610        wait_queue_head_t       ls_wait_general;
 611        wait_queue_head_t       ls_recover_lock_wait;
 612        struct mutex            ls_clear_proc_locks;
 613
 614        struct list_head        ls_root_list;   /* root resources */
 615        struct rw_semaphore     ls_root_sem;    /* protect root_list */
 616
 617        const struct dlm_lockspace_ops *ls_ops;
 618        void                    *ls_ops_arg;
 619
 620        int                     ls_namelen;
 621        char                    ls_name[1];
 622};
 623
 624/*
 625 * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
 626 * that they should abort what they're doing so new recovery can be started.
 627 *
 628 * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
 629 * should do down_write() on the in_recovery rw_semaphore. (doing down_write
 630 * within dlm_ls_stop causes complaints about the lock acquired/released
 631 * in different contexts.)
 632 *
 633 * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
 634 * It sets this after it is done with down_write() on the in_recovery
 635 * rw_semaphore and clears it after it has released the rw_semaphore.
 636 *
 637 * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
 638 * should begin recovery of the lockspace.
 639 *
 640 * LSFL_RUNNING - set when normal locking activity is enabled.
 641 * dlm_ls_stop() clears this to tell dlm locking routines that they should
 642 * quit what they are doing so recovery can run.  dlm_recoverd sets
 643 * this after recovery is finished.
 644 */
 645
 646#define LSFL_RECOVER_STOP       0
 647#define LSFL_RECOVER_DOWN       1
 648#define LSFL_RECOVER_LOCK       2
 649#define LSFL_RECOVER_WORK       3
 650#define LSFL_RUNNING            4
 651
 652#define LSFL_RCOM_READY         5
 653#define LSFL_RCOM_WAIT          6
 654#define LSFL_UEVENT_WAIT        7
 655#define LSFL_TIMEWARN           8
 656#define LSFL_CB_DELAY           9
 657#define LSFL_NODIR              10
 658
 659/* much of this is just saving user space pointers associated with the
 660   lock that we pass back to the user lib with an ast */
 661
 662struct dlm_user_args {
 663        struct dlm_user_proc    *proc; /* each process that opens the lockspace
 664                                          device has private data
 665                                          (dlm_user_proc) on the struct file,
 666                                          the process's locks point back to it*/
 667        struct dlm_lksb         lksb;
 668        struct dlm_lksb __user  *user_lksb;
 669        void __user             *castparam;
 670        void __user             *castaddr;
 671        void __user             *bastparam;
 672        void __user             *bastaddr;
 673        uint64_t                xid;
 674};
 675
 676#define DLM_PROC_FLAGS_CLOSING 1
 677#define DLM_PROC_FLAGS_COMPAT  2
 678
 679/* locks list is kept so we can remove all a process's locks when it
 680   exits (or orphan those that are persistent) */
 681
 682struct dlm_user_proc {
 683        dlm_lockspace_t         *lockspace;
 684        unsigned long           flags; /* DLM_PROC_FLAGS */
 685        struct list_head        asts;
 686        spinlock_t              asts_spin;
 687        struct list_head        locks;
 688        spinlock_t              locks_spin;
 689        struct list_head        unlocking;
 690        wait_queue_head_t       wait;
 691};
 692
 693static inline int dlm_locking_stopped(struct dlm_ls *ls)
 694{
 695        return !test_bit(LSFL_RUNNING, &ls->ls_flags);
 696}
 697
 698static inline int dlm_recovery_stopped(struct dlm_ls *ls)
 699{
 700        return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
 701}
 702
 703static inline int dlm_no_directory(struct dlm_ls *ls)
 704{
 705        return test_bit(LSFL_NODIR, &ls->ls_flags);
 706}
 707
 708int dlm_netlink_init(void);
 709void dlm_netlink_exit(void);
 710void dlm_timeout_warn(struct dlm_lkb *lkb);
 711int dlm_plock_init(void);
 712void dlm_plock_exit(void);
 713
 714#ifdef CONFIG_DLM_DEBUG
 715int dlm_register_debugfs(void);
 716void dlm_unregister_debugfs(void);
 717int dlm_create_debug_file(struct dlm_ls *ls);
 718void dlm_delete_debug_file(struct dlm_ls *ls);
 719#else
 720static inline int dlm_register_debugfs(void) { return 0; }
 721static inline void dlm_unregister_debugfs(void) { }
 722static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
 723static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
 724#endif
 725
 726#endif                          /* __DLM_INTERNAL_DOT_H__ */
 727
 728
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