fs/dlm/dlm_internal.h

   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
  53 struct dlm_ls;
  54 struct dlm_lkb;
  55 struct dlm_rsb;
  56 struct dlm_member;
  57 struct dlm_rsbtable;
  58 struct dlm_recover;
  59 struct dlm_header;
  60 struct dlm_message;
  61 struct dlm_rcom;
  62 struct 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 #define log_rinfo(ls, fmt, args...) \
  69         printk(KERN_INFO "dlm: %s: " fmt "\n", (ls)->ls_name , ##args);
  70
  71 #define log_debug(ls, fmt, args...) \
  72 do { \
  73         if (dlm_config.ci_log_debug) \
  74                 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
  75                        (ls)->ls_name , ##args); \
  76 } while (0)
  77
  78 #define log_limit(ls, fmt, args...) \
  79 do { \
  80         if (dlm_config.ci_log_debug) \
  81                 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \
  82                         (ls)->ls_name , ##args); \
  83 } while (0)
  84
  85 #define DLM_ASSERT(x, do) \
  86 { \
  87   if (!(x)) \
  88   { \
  89     printk(KERN_ERR "\nDLM:  Assertion failed on line %d of file %s\n" \
  90                "DLM:  assertion:  \"%s\"\n" \
  91                "DLM:  time = %lu\n", \
  92                __LINE__, __FILE__, #x, jiffies); \
  93     {do} \
  94     printk("\n"); \
  95     BUG(); \
  96     panic("DLM:  Record message above and reboot.\n"); \
  97   } \
  98 }
  99
 100
 101 #define DLM_RTF_SHRINK          0x00000001
 102
 103 struct dlm_rsbtable {
 104         struct rb_root          keep;
 105         struct rb_root          toss;
 106         spinlock_t              lock;
 107         uint32_t                flags;
 108 };
 109
 110
 111 /*
 112  * Lockspace member (per node in a ls)
 113  */
 114
 115 struct dlm_member {
 116         struct list_head        list;
 117         int                     nodeid;
 118         int                     weight;
 119         int                     slot;
 120         int                     slot_prev;
 121         int                     comm_seq;
 122         uint32_t                generation;
 123 };
 124
 125 /*
 126  * Save and manage recovery state for a lockspace.
 127  */
 128
 129 struct dlm_recover {
 130         struct list_head        list;
 131         struct dlm_config_node  *nodes;
 132         int                     nodes_count;
 133         uint64_t                seq;
 134 };
 135
 136 /*
 137  * Pass input args to second stage locking function.
 138  */
 139
 140 struct dlm_args {
 141         uint32_t                flags;
 142         void                    (*astfn) (void *astparam);
 143         void                    *astparam;
 144         void                    (*bastfn) (void *astparam, int mode);
 145         int                     mode;
 146         struct dlm_lksb         *lksb;
 147         unsigned long           timeout;
 148 };
 149
 150
 151 /*
 152  * Lock block
 153  *
 154  * A lock can be one of three types:
 155  *
 156  * local copy      lock is mastered locally
 157  *                 (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
 158  * process copy    lock is mastered on a remote node
 159  *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
 160  * master copy     master node's copy of a lock owned by remote node
 161  *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
 162  *
 163  * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
 164  * dlm_unlock.  The dlm does not modify these or use any private flags in
 165  * this field; it only contains DLM_LKF_ flags from dlm.h.  These flags
 166  * are sent as-is to the remote master when the lock is remote.
 167  *
 168  * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
 169  * Some internal flags are shared between the master and process nodes;
 170  * these shared flags are kept in the lower two bytes.  One of these
 171  * flags set on the master copy will be propagated to the process copy
 172  * and v.v.  Other internal flags are private to the master or process
 173  * node (e.g. DLM_IFL_MSTCPY).  These are kept in the high two bytes.
 174  *
 175  * lkb_sbflags: status block flags.  These flags are copied directly into
 176  * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
 177  * ast.  All defined in dlm.h with DLM_SBF_ prefix.
 178  *
 179  * lkb_status: the lock status indicates which rsb queue the lock is
 180  * on, grant, convert, or wait.  DLM_LKSTS_ WAITING/GRANTED/CONVERT
 181  *
 182  * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
 183  * reply is needed.  Only set when the lkb is on the lockspace waiters
 184  * list awaiting a reply from a remote node.
 185  *
 186  * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
 187  * is a master copy, nodeid specifies the remote lock holder, when the
 188  * lkb is a process copy, the nodeid specifies the lock master.
 189  */
 190
 191 /* lkb_status */
 192
 193 #define DLM_LKSTS_WAITING       1
 194 #define DLM_LKSTS_GRANTED       2
 195 #define DLM_LKSTS_CONVERT       3
 196
 197 /* lkb_flags */
 198
 199 #define DLM_IFL_MSTCPY          0x00010000
 200 #define DLM_IFL_RESEND          0x00020000
 201 #define DLM_IFL_DEAD            0x00040000
 202 #define DLM_IFL_OVERLAP_UNLOCK  0x00080000
 203 #define DLM_IFL_OVERLAP_CANCEL  0x00100000
 204 #define DLM_IFL_ENDOFLIFE       0x00200000
 205 #define DLM_IFL_WATCH_TIMEWARN  0x00400000
 206 #define DLM_IFL_TIMEOUT_CANCEL  0x00800000
 207 #define DLM_IFL_DEADLOCK_CANCEL 0x01000000
 208 #define DLM_IFL_STUB_MS         0x02000000 /* magic number for m_flags */
 209 #define DLM_IFL_USER            0x00000001
 210 #define DLM_IFL_ORPHAN          0x00000002
 211
 212 #define DLM_CALLBACKS_SIZE      6
 213
 214 #define DLM_CB_CAST             0x00000001
 215 #define DLM_CB_BAST             0x00000002
 216 #define DLM_CB_SKIP             0x00000004
 217
 218 struct dlm_callback {
 219         uint64_t                seq;
 220         uint32_t                flags;          /* DLM_CBF_ */
 221         int                     sb_status;      /* copy to lksb status */
 222         uint8_t                 sb_flags;       /* copy to lksb flags */
 223         int8_t                  mode; /* rq mode of bast, gr mode of cast */
 224 };
 225
 226 struct dlm_lkb {
 227         struct dlm_rsb          *lkb_resource;  /* the rsb */
 228         struct kref             lkb_ref;
 229         int                     lkb_nodeid;     /* copied from rsb */
 230         int                     lkb_ownpid;     /* pid of lock owner */
 231         uint32_t                lkb_id;         /* our lock ID */
 232         uint32_t                lkb_remid;      /* lock ID on remote partner */
 233         uint32_t                lkb_exflags;    /* external flags from caller */
 234         uint32_t                lkb_sbflags;    /* lksb flags */
 235         uint32_t                lkb_flags;      /* internal flags */
 236         uint32_t                lkb_lvbseq;     /* lvb sequence number */
 237
 238         int8_t                  lkb_status;     /* granted, waiting, convert */
 239         int8_t                  lkb_rqmode;     /* requested lock mode */
 240         int8_t                  lkb_grmode;     /* granted lock mode */
 241         int8_t                  lkb_highbast;   /* highest mode bast sent for */
 242
 243         int8_t                  lkb_wait_type;  /* type of reply waiting for */
 244         int8_t                  lkb_wait_count;
 245         int                     lkb_wait_nodeid; /* for debugging */
 246
 247         struct list_head        lkb_statequeue; /* rsb g/c/w list */
 248         struct list_head        lkb_rsb_lookup; /* waiting for rsb lookup */
 249         struct list_head        lkb_wait_reply; /* waiting for remote reply */
 250         struct list_head        lkb_ownqueue;   /* list of locks for a process */
 251         struct list_head        lkb_time_list;
 252         ktime_t                 lkb_timestamp;
 253         ktime_t                 lkb_wait_time;
 254         unsigned long           lkb_timeout_cs;
 255
 256         struct mutex            lkb_cb_mutex;
 257         struct work_struct      lkb_cb_work;
 258         struct list_head        lkb_cb_list; /* for ls_cb_delay or proc->asts */
 259         struct dlm_callback     lkb_callbacks[DLM_CALLBACKS_SIZE];
 260         struct dlm_callback     lkb_last_cast;
 261         struct dlm_callback     lkb_last_bast;
 262         ktime_t                 lkb_last_cast_time;     /* for debugging */
 263         ktime_t                 lkb_last_bast_time;     /* for debugging */
 264
 265         uint64_t                lkb_recover_seq; /* from ls_recover_seq */
 266
 267         char                    *lkb_lvbptr;
 268         struct dlm_lksb         *lkb_lksb;      /* caller's status block */
 269         void                    (*lkb_astfn) (void *astparam);
 270         void                    (*lkb_bastfn) (void *astparam, int mode);
 271         union {
 272                 void                    *lkb_astparam;  /* caller's ast arg */
 273                 struct dlm_user_args    *lkb_ua;
 274         };
 275 };
 276
 277 /*
 278  * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real
 279  * nodeid, even when nodeid is our_nodeid.
 280  *
 281  * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid,
 282  * greater than zero when another nodeid.
 283  *
 284  * (TODO: remove res_nodeid and only use res_master_nodeid)
 285  */
 286
 287 struct dlm_rsb {
 288         struct dlm_ls           *res_ls;        /* the lockspace */
 289         struct kref             res_ref;
 290         struct mutex            res_mutex;
 291         unsigned long           res_flags;
 292         int                     res_length;     /* length of rsb name */
 293         int                     res_nodeid;
 294         int                     res_master_nodeid;
 295         int                     res_dir_nodeid;
 296         int                     res_id;         /* for ls_recover_idr */
 297         uint32_t                res_lvbseq;
 298         uint32_t                res_hash;
 299         uint32_t                res_bucket;     /* rsbtbl */
 300         unsigned long           res_toss_time;
 301         uint32_t                res_first_lkid;
 302         struct list_head        res_lookup;     /* lkbs waiting on first */
 303         union {
 304                 struct list_head        res_hashchain;
 305                 struct rb_node          res_hashnode;   /* rsbtbl */
 306         };
 307         struct list_head        res_grantqueue;
 308         struct list_head        res_convertqueue;
 309         struct list_head        res_waitqueue;
 310
 311         struct list_head        res_root_list;      /* used for recovery */
 312         struct list_head        res_recover_list;   /* used for recovery */
 313         int                     res_recover_locks_count;
 314
 315         char                    *res_lvbptr;
 316         char                    res_name[DLM_RESNAME_MAXLEN+1];
 317 };
 318
 319 /* dlm_master_lookup() flags */
 320
 321 #define DLM_LU_RECOVER_DIR      1
 322 #define DLM_LU_RECOVER_MASTER   2
 323
 324 /* dlm_master_lookup() results */
 325
 326 #define DLM_LU_MATCH            1
 327 #define DLM_LU_ADD              2
 328
 329 /* find_rsb() flags */
 330
 331 #define R_REQUEST               0x00000001
 332 #define R_RECEIVE_REQUEST       0x00000002
 333 #define R_RECEIVE_RECOVER       0x00000004
 334
 335 /* rsb_flags */
 336
 337 enum rsb_flags {
 338         RSB_MASTER_UNCERTAIN,
 339         RSB_VALNOTVALID,
 340         RSB_VALNOTVALID_PREV,
 341         RSB_NEW_MASTER,
 342         RSB_NEW_MASTER2,
 343         RSB_RECOVER_CONVERT,
 344         RSB_RECOVER_GRANT,
 345         RSB_RECOVER_LVB_INVAL,
 346 };
 347
 348 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
 349 {
 350         __set_bit(flag, &r->res_flags);
 351 }
 352
 353 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
 354 {
 355         __clear_bit(flag, &r->res_flags);
 356 }
 357
 358 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
 359 {
 360         return test_bit(flag, &r->res_flags);
 361 }
 362
 363
 364 /* dlm_header is first element of all structs sent between nodes */
 365
 366 #define DLM_HEADER_MAJOR        0x00030000
 367 #define DLM_HEADER_MINOR        0x00000001
 368
 369 #define DLM_HEADER_SLOTS        0x00000001
 370
 371 #define DLM_MSG                 1
 372 #define DLM_RCOM                2
 373
 374 struct dlm_header {
 375         uint32_t                h_version;
 376         uint32_t                h_lockspace;
 377         uint32_t                h_nodeid;       /* nodeid of sender */
 378         uint16_t                h_length;
 379         uint8_t                 h_cmd;          /* DLM_MSG, DLM_RCOM */
 380         uint8_t                 h_pad;
 381 };
 382
 383
 384 #define DLM_MSG_REQUEST         1
 385 #define DLM_MSG_CONVERT         2
 386 #define DLM_MSG_UNLOCK          3
 387 #define DLM_MSG_CANCEL          4
 388 #define DLM_MSG_REQUEST_REPLY   5
 389 #define DLM_MSG_CONVERT_REPLY   6
 390 #define DLM_MSG_UNLOCK_REPLY    7
 391 #define DLM_MSG_CANCEL_REPLY    8
 392 #define DLM_MSG_GRANT           9
 393 #define DLM_MSG_BAST            10
 394 #define DLM_MSG_LOOKUP          11
 395 #define DLM_MSG_REMOVE          12
 396 #define DLM_MSG_LOOKUP_REPLY    13
 397 #define DLM_MSG_PURGE           14
 398
 399 struct dlm_message {
 400         struct dlm_header       m_header;
 401         uint32_t                m_type;         /* DLM_MSG_ */
 402         uint32_t                m_nodeid;
 403         uint32_t                m_pid;
 404         uint32_t                m_lkid;         /* lkid on sender */
 405         uint32_t                m_remid;        /* lkid on receiver */
 406         uint32_t                m_parent_lkid;
 407         uint32_t                m_parent_remid;
 408         uint32_t                m_exflags;
 409         uint32_t                m_sbflags;
 410         uint32_t                m_flags;
 411         uint32_t                m_lvbseq;
 412         uint32_t                m_hash;
 413         int                     m_status;
 414         int                     m_grmode;
 415         int                     m_rqmode;
 416         int                     m_bastmode;
 417         int                     m_asts;
 418         int                     m_result;       /* 0 or -EXXX */
 419         char                    m_extra[0];     /* name or lvb */
 420 };
 421
 422
 423 #define DLM_RS_NODES            0x00000001
 424 #define DLM_RS_NODES_ALL        0x00000002
 425 #define DLM_RS_DIR              0x00000004
 426 #define DLM_RS_DIR_ALL          0x00000008
 427 #define DLM_RS_LOCKS            0x00000010
 428 #define DLM_RS_LOCKS_ALL        0x00000020
 429 #define DLM_RS_DONE             0x00000040
 430 #define DLM_RS_DONE_ALL         0x00000080
 431
 432 #define DLM_RCOM_STATUS         1
 433 #define DLM_RCOM_NAMES          2
 434 #define DLM_RCOM_LOOKUP         3
 435 #define DLM_RCOM_LOCK           4
 436 #define DLM_RCOM_STATUS_REPLY   5
 437 #define DLM_RCOM_NAMES_REPLY    6
 438 #define DLM_RCOM_LOOKUP_REPLY   7
 439 #define DLM_RCOM_LOCK_REPLY     8
 440
 441 struct dlm_rcom {
 442         struct dlm_header       rc_header;
 443         uint32_t                rc_type;        /* DLM_RCOM_ */
 444         int                     rc_result;      /* multi-purpose */
 445         uint64_t                rc_id;          /* match reply with request */
 446         uint64_t                rc_seq;         /* sender's ls_recover_seq */
 447         uint64_t                rc_seq_reply;   /* remote ls_recover_seq */
 448         char                    rc_buf[0];
 449 };
 450
 451 union dlm_packet {
 452         struct dlm_header       header;         /* common to other two */
 453         struct dlm_message      message;
 454         struct dlm_rcom         rcom;
 455 };
 456
 457 #define DLM_RSF_NEED_SLOTS      0x00000001
 458
 459 /* RCOM_STATUS data */
 460 struct rcom_status {
 461         __le32                  rs_flags;
 462         __le32                  rs_unused1;
 463         __le64                  rs_unused2;
 464 };
 465
 466 /* RCOM_STATUS_REPLY data */
 467 struct rcom_config {
 468         __le32                  rf_lvblen;
 469         __le32                  rf_lsflags;
 470
 471         /* DLM_HEADER_SLOTS adds: */
 472         __le32                  rf_flags;
 473         __le16                  rf_our_slot;
 474         __le16                  rf_num_slots;
 475         __le32                  rf_generation;
 476         __le32                  rf_unused1;
 477         __le64                  rf_unused2;
 478 };
 479
 480 struct rcom_slot {
 481         __le32                  ro_nodeid;
 482         __le16                  ro_slot;
 483         __le16                  ro_unused1;
 484         __le64                  ro_unused2;
 485 };
 486
 487 struct rcom_lock {
 488         __le32                  rl_ownpid;
 489         __le32                  rl_lkid;
 490         __le32                  rl_remid;
 491         __le32                  rl_parent_lkid;
 492         __le32                  rl_parent_remid;
 493         __le32                  rl_exflags;
 494         __le32                  rl_flags;
 495         __le32                  rl_lvbseq;
 496         __le32                  rl_result;
 497         int8_t                  rl_rqmode;
 498         int8_t                  rl_grmode;
 499         int8_t                  rl_status;
 500         int8_t                  rl_asts;
 501         __le16                  rl_wait_type;
 502         __le16                  rl_namelen;
 503         char                    rl_name[DLM_RESNAME_MAXLEN];
 504         char                    rl_lvb[0];
 505 };
 506
 507 /*
 508  * The max number of resources per rsbtbl bucket that shrink will attempt
 509  * to remove in each iteration.
 510  */
 511
 512 #define DLM_REMOVE_NAMES_MAX 8
 513
 514 struct dlm_ls {
 515         struct list_head        ls_list;        /* list of lockspaces */
 516         dlm_lockspace_t         *ls_local_handle;
 517         uint32_t                ls_global_id;   /* global unique lockspace ID */
 518         uint32_t                ls_generation;
 519         uint32_t                ls_exflags;
 520         int                     ls_lvblen;
 521         int                     ls_count;       /* refcount of processes in
 522                                                    the dlm using this ls */
 523         int                     ls_create_count; /* create/release refcount */
 524         unsigned long           ls_flags;       /* LSFL_ */
 525         unsigned long           ls_scan_time;
 526         struct kobject          ls_kobj;
 527
 528         struct idr              ls_lkbidr;
 529         spinlock_t              ls_lkbidr_spin;
 530
 531         struct dlm_rsbtable     *ls_rsbtbl;
 532         uint32_t                ls_rsbtbl_size;
 533
 534         struct mutex            ls_waiters_mutex;
 535         struct list_head        ls_waiters;     /* lkbs needing a reply */
 536
 537         struct mutex            ls_orphans_mutex;
 538         struct list_head        ls_orphans;
 539
 540         struct mutex            ls_timeout_mutex;
 541         struct list_head        ls_timeout;
 542
 543         spinlock_t              ls_new_rsb_spin;
 544         int                     ls_new_rsb_count;
 545         struct list_head        ls_new_rsb;     /* new rsb structs */
 546
 547         spinlock_t              ls_remove_spin;
 548         char                    ls_remove_name[DLM_RESNAME_MAXLEN+1];
 549         char                    *ls_remove_names[DLM_REMOVE_NAMES_MAX];
 550         int                     ls_remove_len;
 551         int                     ls_remove_lens[DLM_REMOVE_NAMES_MAX];
 552
 553         struct list_head        ls_nodes;       /* current nodes in ls */
 554         struct list_head        ls_nodes_gone;  /* dead node list, recovery */
 555         int                     ls_num_nodes;   /* number of nodes in ls */
 556         int                     ls_low_nodeid;
 557         int                     ls_total_weight;
 558         int                     *ls_node_array;
 559
 560         int                     ls_slot;
 561         int                     ls_num_slots;
 562         int                     ls_slots_size;
 563         struct dlm_slot         *ls_slots;
 564
 565         struct dlm_rsb          ls_stub_rsb;    /* for returning errors */
 566         struct dlm_lkb          ls_stub_lkb;    /* for returning errors */
 567         struct dlm_message      ls_stub_ms;     /* for faking a reply */
 568
 569         struct dentry           *ls_debug_rsb_dentry; /* debugfs */
 570         struct dentry           *ls_debug_waiters_dentry; /* debugfs */
 571         struct dentry           *ls_debug_locks_dentry; /* debugfs */
 572         struct dentry           *ls_debug_all_dentry; /* debugfs */
 573         struct dentry           *ls_debug_toss_dentry; /* debugfs */
 574
 575         wait_queue_head_t       ls_uevent_wait; /* user part of join/leave */
 576         int                     ls_uevent_result;
 577         struct completion       ls_members_done;
 578         int                     ls_members_result;
 579
 580         struct miscdevice       ls_device;
 581
 582         struct workqueue_struct *ls_callback_wq;
 583
 584         /* recovery related */
 585
 586         struct mutex            ls_cb_mutex;
 587         struct list_head        ls_cb_delay; /* save for queue_work later */
 588         struct timer_list       ls_timer;
 589         struct task_struct      *ls_recoverd_task;
 590         struct mutex            ls_recoverd_active;
 591         spinlock_t              ls_recover_lock;
 592         unsigned long           ls_recover_begin; /* jiffies timestamp */
 593         uint32_t                ls_recover_status; /* DLM_RS_ */
 594         uint64_t                ls_recover_seq;
 595         struct dlm_recover      *ls_recover_args;
 596         struct rw_semaphore     ls_in_recovery; /* block local requests */
 597         struct rw_semaphore     ls_recv_active; /* block dlm_recv */
 598         struct list_head        ls_requestqueue;/* queue remote requests */
 599         struct mutex            ls_requestqueue_mutex;
 600         struct dlm_rcom         *ls_recover_buf;
 601         int                     ls_recover_nodeid; /* for debugging */
 602         unsigned int            ls_recover_dir_sent_res; /* for log info */
 603         unsigned int            ls_recover_dir_sent_msg; /* for log info */
 604         unsigned int            ls_recover_locks_in; /* for log info */
 605         uint64_t                ls_rcom_seq;
 606         spinlock_t              ls_rcom_spin;
 607         struct list_head        ls_recover_list;
 608         spinlock_t              ls_recover_list_lock;
 609         int                     ls_recover_list_count;
 610         struct idr              ls_recover_idr;
 611         spinlock_t              ls_recover_idr_lock;
 612         wait_queue_head_t       ls_wait_general;
 613         wait_queue_head_t       ls_recover_lock_wait;
 614         struct mutex            ls_clear_proc_locks;
 615
 616         struct list_head        ls_root_list;   /* root resources */
 617         struct rw_semaphore     ls_root_sem;    /* protect root_list */
 618
 619         const struct dlm_lockspace_ops *ls_ops;
 620         void                    *ls_ops_arg;
 621
 622         int                     ls_namelen;
 623         char                    ls_name[1];
 624 };
 625
 626 /*
 627  * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
 628  * that they should abort what they're doing so new recovery can be started.
 629  *
 630  * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
 631  * should do down_write() on the in_recovery rw_semaphore. (doing down_write
 632  * within dlm_ls_stop causes complaints about the lock acquired/released
 633  * in different contexts.)
 634  *
 635  * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
 636  * It sets this after it is done with down_write() on the in_recovery
 637  * rw_semaphore and clears it after it has released the rw_semaphore.
 638  *
 639  * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
 640  * should begin recovery of the lockspace.
 641  *
 642  * LSFL_RUNNING - set when normal locking activity is enabled.
 643  * dlm_ls_stop() clears this to tell dlm locking routines that they should
 644  * quit what they are doing so recovery can run.  dlm_recoverd sets
 645  * this after recovery is finished.
 646  */
 647
 648 #define LSFL_RECOVER_STOP       0
 649 #define LSFL_RECOVER_DOWN       1
 650 #define LSFL_RECOVER_LOCK       2
 651 #define LSFL_RECOVER_WORK       3
 652 #define LSFL_RUNNING            4
 653
 654 #define LSFL_RCOM_READY         5
 655 #define LSFL_RCOM_WAIT          6
 656 #define LSFL_UEVENT_WAIT        7
 657 #define LSFL_TIMEWARN           8
 658 #define LSFL_CB_DELAY           9
 659 #define LSFL_NODIR              10
 660
 661 /* much of this is just saving user space pointers associated with the
 662    lock that we pass back to the user lib with an ast */
 663
 664 struct dlm_user_args {
 665         struct dlm_user_proc    *proc; /* each process that opens the lockspace
 666                                           device has private data
 667                                           (dlm_user_proc) on the struct file,
 668                                           the process's locks point back to it*/
 669         struct dlm_lksb         lksb;
 670         struct dlm_lksb __user  *user_lksb;
 671         void __user             *castparam;
 672         void __user             *castaddr;
 673         void __user             *bastparam;
 674         void __user             *bastaddr;
 675         uint64_t                xid;
 676 };
 677
 678 #define DLM_PROC_FLAGS_CLOSING 1
 679 #define DLM_PROC_FLAGS_COMPAT  2
 680
 681 /* locks list is kept so we can remove all a process's locks when it
 682    exits (or orphan those that are persistent) */
 683
 684 struct dlm_user_proc {
 685         dlm_lockspace_t         *lockspace;
 686         unsigned long           flags; /* DLM_PROC_FLAGS */
 687         struct list_head        asts;
 688         spinlock_t              asts_spin;
 689         struct list_head        locks;
 690         spinlock_t              locks_spin;
 691         struct list_head        unlocking;
 692         wait_queue_head_t       wait;
 693 };
 694
 695 static inline int dlm_locking_stopped(struct dlm_ls *ls)
 696 {
 697         return !test_bit(LSFL_RUNNING, &ls->ls_flags);
 698 }
 699
 700 static inline int dlm_recovery_stopped(struct dlm_ls *ls)
 701 {
 702         return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
 703 }
 704
 705 static inline int dlm_no_directory(struct dlm_ls *ls)
 706 {
 707         return test_bit(LSFL_NODIR, &ls->ls_flags);
 708 }
 709
 710 int dlm_netlink_init(void);
 711 void dlm_netlink_exit(void);
 712 void dlm_timeout_warn(struct dlm_lkb *lkb);
 713 int dlm_plock_init(void);
 714 void dlm_plock_exit(void);
 715
 716 #ifdef CONFIG_DLM_DEBUG
 717 int dlm_register_debugfs(void);
 718 void dlm_unregister_debugfs(void);
 719 int dlm_create_debug_file(struct dlm_ls *ls);
 720 void dlm_delete_debug_file(struct dlm_ls *ls);
 721 #else
 722 static inline int dlm_register_debugfs(void) { return 0; }
 723 static inline void dlm_unregister_debugfs(void) { }
 724 static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
 725 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
 726 #endif
 727
 728 #endif                          /* __DLM_INTERNAL_DOT_H__ */
 729