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 struct 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
 110 struct 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
 124 struct 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
 135 struct 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
 213 struct 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
 221 struct 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
 282 struct 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
 332 enum 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         RSB_RECOVER_LVB_INVAL,
 341 };
 342
 343 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
 344 {
 345         __set_bit(flag, &r->res_flags);
 346 }
 347
 348 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
 349 {
 350         __clear_bit(flag, &r->res_flags);
 351 }
 352
 353 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
 354 {
 355         return test_bit(flag, &r->res_flags);
 356 }
 357
 358
 359 /* dlm_header is first element of all structs sent between nodes */
 360
 361 #define DLM_HEADER_MAJOR        0x00030000
 362 #define DLM_HEADER_MINOR        0x00000001
 363
 364 #define DLM_HEADER_SLOTS        0x00000001
 365
 366 #define DLM_MSG                 1
 367 #define DLM_RCOM                2
 368
 369 struct dlm_header {
 370         uint32_t                h_version;
 371         uint32_t                h_lockspace;
 372         uint32_t                h_nodeid;       /* nodeid of sender */
 373         uint16_t                h_length;
 374         uint8_t                 h_cmd;          /* DLM_MSG, DLM_RCOM */
 375         uint8_t                 h_pad;
 376 };
 377
 378
 379 #define DLM_MSG_REQUEST         1
 380 #define DLM_MSG_CONVERT         2
 381 #define DLM_MSG_UNLOCK          3
 382 #define DLM_MSG_CANCEL          4
 383 #define DLM_MSG_REQUEST_REPLY   5
 384 #define DLM_MSG_CONVERT_REPLY   6
 385 #define DLM_MSG_UNLOCK_REPLY    7
 386 #define DLM_MSG_CANCEL_REPLY    8
 387 #define DLM_MSG_GRANT           9
 388 #define DLM_MSG_BAST            10
 389 #define DLM_MSG_LOOKUP          11
 390 #define DLM_MSG_REMOVE          12
 391 #define DLM_MSG_LOOKUP_REPLY    13
 392 #define DLM_MSG_PURGE           14
 393
 394 struct dlm_message {
 395         struct dlm_header       m_header;
 396         uint32_t                m_type;         /* DLM_MSG_ */
 397         uint32_t                m_nodeid;
 398         uint32_t                m_pid;
 399         uint32_t                m_lkid;         /* lkid on sender */
 400         uint32_t                m_remid;        /* lkid on receiver */
 401         uint32_t                m_parent_lkid;
 402         uint32_t                m_parent_remid;
 403         uint32_t                m_exflags;
 404         uint32_t                m_sbflags;
 405         uint32_t                m_flags;
 406         uint32_t                m_lvbseq;
 407         uint32_t                m_hash;
 408         int                     m_status;
 409         int                     m_grmode;
 410         int                     m_rqmode;
 411         int                     m_bastmode;
 412         int                     m_asts;
 413         int                     m_result;       /* 0 or -EXXX */
 414         char                    m_extra[0];     /* name or lvb */
 415 };
 416
 417
 418 #define DLM_RS_NODES            0x00000001
 419 #define DLM_RS_NODES_ALL        0x00000002
 420 #define DLM_RS_DIR              0x00000004
 421 #define DLM_RS_DIR_ALL          0x00000008
 422 #define DLM_RS_LOCKS            0x00000010
 423 #define DLM_RS_LOCKS_ALL        0x00000020
 424 #define DLM_RS_DONE             0x00000040
 425 #define DLM_RS_DONE_ALL         0x00000080
 426
 427 #define DLM_RCOM_STATUS         1
 428 #define DLM_RCOM_NAMES          2
 429 #define DLM_RCOM_LOOKUP         3
 430 #define DLM_RCOM_LOCK           4
 431 #define DLM_RCOM_STATUS_REPLY   5
 432 #define DLM_RCOM_NAMES_REPLY    6
 433 #define DLM_RCOM_LOOKUP_REPLY   7
 434 #define DLM_RCOM_LOCK_REPLY     8
 435
 436 struct dlm_rcom {
 437         struct dlm_header       rc_header;
 438         uint32_t                rc_type;        /* DLM_RCOM_ */
 439         int                     rc_result;      /* multi-purpose */
 440         uint64_t                rc_id;          /* match reply with request */
 441         uint64_t                rc_seq;         /* sender's ls_recover_seq */
 442         uint64_t                rc_seq_reply;   /* remote ls_recover_seq */
 443         char                    rc_buf[0];
 444 };
 445
 446 union dlm_packet {
 447         struct dlm_header       header;         /* common to other two */
 448         struct dlm_message      message;
 449         struct dlm_rcom         rcom;
 450 };
 451
 452 #define DLM_RSF_NEED_SLOTS      0x00000001
 453
 454 /* RCOM_STATUS data */
 455 struct rcom_status {
 456         __le32                  rs_flags;
 457         __le32                  rs_unused1;
 458         __le64                  rs_unused2;
 459 };
 460
 461 /* RCOM_STATUS_REPLY data */
 462 struct rcom_config {
 463         __le32                  rf_lvblen;
 464         __le32                  rf_lsflags;
 465
 466         /* DLM_HEADER_SLOTS adds: */
 467         __le32                  rf_flags;
 468         __le16                  rf_our_slot;
 469         __le16                  rf_num_slots;
 470         __le32                  rf_generation;
 471         __le32                  rf_unused1;
 472         __le64                  rf_unused2;
 473 };
 474
 475 struct rcom_slot {
 476         __le32                  ro_nodeid;
 477         __le16                  ro_slot;
 478         __le16                  ro_unused1;
 479         __le64                  ro_unused2;
 480 };
 481
 482 struct rcom_lock {
 483         __le32                  rl_ownpid;
 484         __le32                  rl_lkid;
 485         __le32                  rl_remid;
 486         __le32                  rl_parent_lkid;
 487         __le32                  rl_parent_remid;
 488         __le32                  rl_exflags;
 489         __le32                  rl_flags;
 490         __le32                  rl_lvbseq;
 491         __le32                  rl_result;
 492         int8_t                  rl_rqmode;
 493         int8_t                  rl_grmode;
 494         int8_t                  rl_status;
 495         int8_t                  rl_asts;
 496         __le16                  rl_wait_type;
 497         __le16                  rl_namelen;
 498         char                    rl_name[DLM_RESNAME_MAXLEN];
 499         char                    rl_lvb[0];
 500 };
 501
 502 /*
 503  * The max number of resources per rsbtbl bucket that shrink will attempt
 504  * to remove in each iteration.
 505  */
 506
 507 #define DLM_REMOVE_NAMES_MAX 8
 508
 509 struct dlm_ls {
 510         struct list_head        ls_list;        /* list of lockspaces */
 511         dlm_lockspace_t         *ls_local_handle;
 512         uint32_t                ls_global_id;   /* global unique lockspace ID */
 513         uint32_t                ls_generation;
 514         uint32_t                ls_exflags;
 515         int                     ls_lvblen;
 516         int                     ls_count;       /* refcount of processes in
 517                                                    the dlm using this ls */
 518         int                     ls_create_count; /* create/release refcount */
 519         unsigned long           ls_flags;       /* LSFL_ */
 520         unsigned long           ls_scan_time;
 521         struct kobject          ls_kobj;
 522
 523         struct idr              ls_lkbidr;
 524         spinlock_t              ls_lkbidr_spin;
 525
 526         struct dlm_rsbtable     *ls_rsbtbl;
 527         uint32_t                ls_rsbtbl_size;
 528
 529         struct mutex            ls_waiters_mutex;
 530         struct list_head        ls_waiters;     /* lkbs needing a reply */
 531
 532         struct mutex            ls_orphans_mutex;
 533         struct list_head        ls_orphans;
 534
 535         struct mutex            ls_timeout_mutex;
 536         struct list_head        ls_timeout;
 537
 538         spinlock_t              ls_new_rsb_spin;
 539         int                     ls_new_rsb_count;
 540         struct list_head        ls_new_rsb;     /* new rsb structs */
 541
 542         spinlock_t              ls_remove_spin;
 543         char                    ls_remove_name[DLM_RESNAME_MAXLEN+1];
 544         char                    *ls_remove_names[DLM_REMOVE_NAMES_MAX];
 545         int                     ls_remove_len;
 546         int                     ls_remove_lens[DLM_REMOVE_NAMES_MAX];
 547
 548         struct list_head        ls_nodes;       /* current nodes in ls */
 549         struct list_head        ls_nodes_gone;  /* dead node list, recovery */
 550         int                     ls_num_nodes;   /* number of nodes in ls */
 551         int                     ls_low_nodeid;
 552         int                     ls_total_weight;
 553         int                     *ls_node_array;
 554
 555         int                     ls_slot;
 556         int                     ls_num_slots;
 557         int                     ls_slots_size;
 558         struct dlm_slot         *ls_slots;
 559
 560         struct dlm_rsb          ls_stub_rsb;    /* for returning errors */
 561         struct dlm_lkb          ls_stub_lkb;    /* for returning errors */
 562         struct dlm_message      ls_stub_ms;     /* for faking a reply */
 563
 564         struct dentry           *ls_debug_rsb_dentry; /* debugfs */
 565         struct dentry           *ls_debug_waiters_dentry; /* debugfs */
 566         struct dentry           *ls_debug_locks_dentry; /* debugfs */
 567         struct dentry           *ls_debug_all_dentry; /* debugfs */
 568         struct dentry           *ls_debug_toss_dentry; /* debugfs */
 569
 570         wait_queue_head_t       ls_uevent_wait; /* user part of join/leave */
 571         int                     ls_uevent_result;
 572         struct completion       ls_members_done;
 573         int                     ls_members_result;
 574
 575         struct miscdevice       ls_device;
 576
 577         struct workqueue_struct *ls_callback_wq;
 578
 579         /* recovery related */
 580
 581         struct mutex            ls_cb_mutex;
 582         struct list_head        ls_cb_delay; /* save for queue_work later */
 583         struct timer_list       ls_timer;
 584         struct task_struct      *ls_recoverd_task;
 585         struct mutex            ls_recoverd_active;
 586         spinlock_t              ls_recover_lock;
 587         unsigned long           ls_recover_begin; /* jiffies timestamp */
 588         uint32_t                ls_recover_status; /* DLM_RS_ */
 589         uint64_t                ls_recover_seq;
 590         struct dlm_recover      *ls_recover_args;
 591         struct rw_semaphore     ls_in_recovery; /* block local requests */
 592         struct rw_semaphore     ls_recv_active; /* block dlm_recv */
 593         struct list_head        ls_requestqueue;/* queue remote requests */
 594         struct mutex            ls_requestqueue_mutex;
 595         struct dlm_rcom         *ls_recover_buf;
 596         int                     ls_recover_nodeid; /* for debugging */
 597         unsigned int            ls_recover_dir_sent_res; /* for log info */
 598         unsigned int            ls_recover_dir_sent_msg; /* for log info */
 599         unsigned int            ls_recover_locks_in; /* for log info */
 600         uint64_t                ls_rcom_seq;
 601         spinlock_t              ls_rcom_spin;
 602         struct list_head        ls_recover_list;
 603         spinlock_t              ls_recover_list_lock;
 604         int                     ls_recover_list_count;
 605         struct idr              ls_recover_idr;
 606         spinlock_t              ls_recover_idr_lock;
 607         wait_queue_head_t       ls_wait_general;
 608         wait_queue_head_t       ls_recover_lock_wait;
 609         struct mutex            ls_clear_proc_locks;
 610
 611         struct list_head        ls_root_list;   /* root resources */
 612         struct rw_semaphore     ls_root_sem;    /* protect root_list */
 613
 614         const struct dlm_lockspace_ops *ls_ops;
 615         void                    *ls_ops_arg;
 616
 617         int                     ls_namelen;
 618         char                    ls_name[1];
 619 };
 620
 621 /*
 622  * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
 623  * that they should abort what they're doing so new recovery can be started.
 624  *
 625  * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
 626  * should do down_write() on the in_recovery rw_semaphore. (doing down_write
 627  * within dlm_ls_stop causes complaints about the lock acquired/released
 628  * in different contexts.)
 629  *
 630  * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
 631  * It sets this after it is done with down_write() on the in_recovery
 632  * rw_semaphore and clears it after it has released the rw_semaphore.
 633  *
 634  * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
 635  * should begin recovery of the lockspace.
 636  *
 637  * LSFL_RUNNING - set when normal locking activity is enabled.
 638  * dlm_ls_stop() clears this to tell dlm locking routines that they should
 639  * quit what they are doing so recovery can run.  dlm_recoverd sets
 640  * this after recovery is finished.
 641  */
 642
 643 #define LSFL_RECOVER_STOP       0
 644 #define LSFL_RECOVER_DOWN       1
 645 #define LSFL_RECOVER_LOCK       2
 646 #define LSFL_RECOVER_WORK       3
 647 #define LSFL_RUNNING            4
 648
 649 #define LSFL_RCOM_READY         5
 650 #define LSFL_RCOM_WAIT          6
 651 #define LSFL_UEVENT_WAIT        7
 652 #define LSFL_TIMEWARN           8
 653 #define LSFL_CB_DELAY           9
 654 #define LSFL_NODIR              10
 655
 656 /* much of this is just saving user space pointers associated with the
 657    lock that we pass back to the user lib with an ast */
 658
 659 struct dlm_user_args {
 660         struct dlm_user_proc    *proc; /* each process that opens the lockspace
 661                                           device has private data
 662                                           (dlm_user_proc) on the struct file,
 663                                           the process's locks point back to it*/
 664         struct dlm_lksb         lksb;
 665         struct dlm_lksb __user  *user_lksb;
 666         void __user             *castparam;
 667         void __user             *castaddr;
 668         void __user             *bastparam;
 669         void __user             *bastaddr;
 670         uint64_t                xid;
 671 };
 672
 673 #define DLM_PROC_FLAGS_CLOSING 1
 674 #define DLM_PROC_FLAGS_COMPAT  2
 675
 676 /* locks list is kept so we can remove all a process's locks when it
 677    exits (or orphan those that are persistent) */
 678
 679 struct dlm_user_proc {
 680         dlm_lockspace_t         *lockspace;
 681         unsigned long           flags; /* DLM_PROC_FLAGS */
 682         struct list_head        asts;
 683         spinlock_t              asts_spin;
 684         struct list_head        locks;
 685         spinlock_t              locks_spin;
 686         struct list_head        unlocking;
 687         wait_queue_head_t       wait;
 688 };
 689
 690 static inline int dlm_locking_stopped(struct dlm_ls *ls)
 691 {
 692         return !test_bit(LSFL_RUNNING, &ls->ls_flags);
 693 }
 694
 695 static inline int dlm_recovery_stopped(struct dlm_ls *ls)
 696 {
 697         return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
 698 }
 699
 700 static inline int dlm_no_directory(struct dlm_ls *ls)
 701 {
 702         return test_bit(LSFL_NODIR, &ls->ls_flags);
 703 }
 704
 705 int dlm_netlink_init(void);
 706 void dlm_netlink_exit(void);
 707 void dlm_timeout_warn(struct dlm_lkb *lkb);
 708 int dlm_plock_init(void);
 709 void dlm_plock_exit(void);
 710
 711 #ifdef CONFIG_DLM_DEBUG
 712 int dlm_register_debugfs(void);
 713 void dlm_unregister_debugfs(void);
 714 int dlm_create_debug_file(struct dlm_ls *ls);
 715 void dlm_delete_debug_file(struct dlm_ls *ls);
 716 #else
 717 static inline int dlm_register_debugfs(void) { return 0; }
 718 static inline void dlm_unregister_debugfs(void) { }
 719 static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
 720 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
 721 #endif
 722
 723 #endif                          /* __DLM_INTERNAL_DOT_H__ */
 724