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
  69 #define log_debug(ls, fmt, args...) \
  70 do { \
  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...) \
  77 do { \
  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
 101 struct 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
 113 struct 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
 127 struct 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
 138 struct 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
 216 struct 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
 224 struct 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
 285 struct 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
 335 enum 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
 346 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
 347 {
 348         __set_bit(flag, &r->res_flags);
 349 }
 350
 351 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
 352 {
 353         __clear_bit(flag, &r->res_flags);
 354 }
 355
 356 static 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
 372 struct 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
 397 struct 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
 439 struct 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
 449 union 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 */
 458 struct rcom_status {
 459         __le32                  rs_flags;
 460         __le32                  rs_unused1;
 461         __le64                  rs_unused2;
 462 };
 463
 464 /* RCOM_STATUS_REPLY data */
 465 struct 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
 478 struct rcom_slot {
 479         __le32                  ro_nodeid;
 480         __le16                  ro_slot;
 481         __le16                  ro_unused1;
 482         __le64                  ro_unused2;
 483 };
 484
 485 struct 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
 512 struct 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
 662 struct 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
 682 struct 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
 693 static inline int dlm_locking_stopped(struct dlm_ls *ls)
 694 {
 695         return !test_bit(LSFL_RUNNING, &ls->ls_flags);
 696 }
 697
 698 static inline int dlm_recovery_stopped(struct dlm_ls *ls)
 699 {
 700         return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
 701 }
 702
 703 static inline int dlm_no_directory(struct dlm_ls *ls)
 704 {
 705         return test_bit(LSFL_NODIR, &ls->ls_flags);
 706 }
 707
 708 int dlm_netlink_init(void);
 709 void dlm_netlink_exit(void);
 710 void dlm_timeout_warn(struct dlm_lkb *lkb);
 711 int dlm_plock_init(void);
 712 void dlm_plock_exit(void);
 713
 714 #ifdef CONFIG_DLM_DEBUG
 715 int dlm_register_debugfs(void);
 716 void dlm_unregister_debugfs(void);
 717 int dlm_create_debug_file(struct dlm_ls *ls);
 718 void dlm_delete_debug_file(struct dlm_ls *ls);
 719 #else
 720 static inline int dlm_register_debugfs(void) { return 0; }
 721 static inline void dlm_unregister_debugfs(void) { }
 722 static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
 723 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
 724 #endif
 725
 726 #endif                          /* __DLM_INTERNAL_DOT_H__ */
 727