fs/dlm/dlm_internal.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /******************************************************************************
   3 *******************************************************************************
   4 **
   5 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   6 **  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   7 **
   8 **
   9 *******************************************************************************
  10 ******************************************************************************/
  11
  12 #ifndef __DLM_INTERNAL_DOT_H__
  13 #define __DLM_INTERNAL_DOT_H__
  14
  15 /*
  16  * This is the main header file to be included in each DLM source file.
  17  */
  18
  19 #include <linux/slab.h>
  20 #include <linux/sched.h>
  21 #include <linux/types.h>
  22 #include <linux/ctype.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/list.h>
  26 #include <linux/errno.h>
  27 #include <linux/random.h>
  28 #include <linux/delay.h>
  29 #include <linux/socket.h>
  30 #include <linux/kthread.h>
  31 #include <linux/kobject.h>
  32 #include <linux/kref.h>
  33 #include <linux/kernel.h>
  34 #include <linux/jhash.h>
  35 #include <linux/miscdevice.h>
  36 #include <linux/mutex.h>
  37 #include <linux/idr.h>
  38 #include <linux/ratelimit.h>
  39 #include <linux/uaccess.h>
  40
  41 #include <linux/dlm.h>
  42 #include "config.h"
  43
  44 struct dlm_ls;
  45 struct dlm_lkb;
  46 struct dlm_rsb;
  47 struct dlm_member;
  48 struct dlm_rsbtable;
  49 struct dlm_recover;
  50 struct dlm_header;
  51 struct dlm_message;
  52 struct dlm_rcom;
  53 struct dlm_mhandle;
  54 struct dlm_msg;
  55
  56 #define log_print(fmt, args...) \
  57         printk(KERN_ERR "dlm: "fmt"\n" , ##args)
  58 #define log_print_ratelimited(fmt, args...) \
  59         printk_ratelimited(KERN_ERR "dlm: "fmt"\n", ##args)
  60 #define log_error(ls, fmt, args...) \
  61         printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
  62
  63 #define log_rinfo(ls, fmt, args...) \
  64 do { \
  65         if (dlm_config.ci_log_info) \
  66                 printk(KERN_INFO "dlm: %s: " fmt "\n", \
  67                         (ls)->ls_name, ##args); \
  68         else if (dlm_config.ci_log_debug) \
  69                 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
  70                        (ls)->ls_name , ##args); \
  71 } while (0)
  72
  73 #define log_debug(ls, fmt, args...) \
  74 do { \
  75         if (dlm_config.ci_log_debug) \
  76                 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
  77                        (ls)->ls_name , ##args); \
  78 } while (0)
  79
  80 #define log_limit(ls, fmt, args...) \
  81 do { \
  82         if (dlm_config.ci_log_debug) \
  83                 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \
  84                         (ls)->ls_name , ##args); \
  85 } while (0)
  86
  87 #define DLM_ASSERT(x, do) \
  88 { \
  89   if (!(x)) \
  90   { \
  91     printk(KERN_ERR "\nDLM:  Assertion failed on line %d of file %s\n" \
  92                "DLM:  assertion:  \"%s\"\n" \
  93                "DLM:  time = %lu\n", \
  94                __LINE__, __FILE__, #x, jiffies); \
  95     {do} \
  96     printk("\n"); \
  97     panic("DLM:  Record message above and reboot.\n"); \
  98   } \
  99 }
 100
 101
 102 #define DLM_RTF_SHRINK_BIT      0
 103
 104 struct dlm_rsbtable {
 105         struct rb_root          keep;
 106         struct rb_root          toss;
 107         spinlock_t              lock;
 108         unsigned long           flags;
 109 };
 110
 111
 112 /*
 113  * Lockspace member (per node in a ls)
 114  */
 115
 116 struct dlm_member {
 117         struct list_head        list;
 118         int                     nodeid;
 119         int                     weight;
 120         int                     slot;
 121         int                     slot_prev;
 122         int                     comm_seq;
 123         uint32_t                generation;
 124 };
 125
 126 /*
 127  * Save and manage recovery state for a lockspace.
 128  */
 129
 130 struct dlm_recover {
 131         struct list_head        list;
 132         struct dlm_config_node  *nodes;
 133         int                     nodes_count;
 134         uint64_t                seq;
 135 };
 136
 137 /*
 138  * Pass input args to second stage locking function.
 139  */
 140
 141 struct dlm_args {
 142         uint32_t                flags;
 143         void                    (*astfn) (void *astparam);
 144         void                    *astparam;
 145         void                    (*bastfn) (void *astparam, int mode);
 146         int                     mode;
 147         struct dlm_lksb         *lksb;
 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_iflags */
 198
 199 #define DLM_IFL_MSTCPY_BIT      16
 200 #define __DLM_IFL_MIN_BIT       DLM_IFL_MSTCPY_BIT
 201 #define DLM_IFL_RESEND_BIT      17
 202 #define DLM_IFL_DEAD_BIT        18
 203 #define DLM_IFL_OVERLAP_UNLOCK_BIT 19
 204 #define DLM_IFL_OVERLAP_CANCEL_BIT 20
 205 #define DLM_IFL_ENDOFLIFE_BIT   21
 206 #define DLM_IFL_DEADLOCK_CANCEL_BIT 24
 207 #define DLM_IFL_CB_PENDING_BIT  25
 208 #define __DLM_IFL_MAX_BIT       DLM_IFL_CB_PENDING_BIT
 209
 210 /* lkb_dflags */
 211
 212 #define DLM_DFL_USER_BIT        0
 213 #define __DLM_DFL_MIN_BIT       DLM_DFL_USER_BIT
 214 #define DLM_DFL_ORPHAN_BIT      1
 215 #define __DLM_DFL_MAX_BIT       DLM_DFL_ORPHAN_BIT
 216
 217 #define DLM_CB_CAST             0x00000001
 218 #define DLM_CB_BAST             0x00000002
 219
 220 struct dlm_callback {
 221         uint32_t                flags;          /* DLM_CBF_ */
 222         int                     sb_status;      /* copy to lksb status */
 223         uint8_t                 sb_flags;       /* copy to lksb flags */
 224         int8_t                  mode; /* rq mode of bast, gr mode of cast */
 225
 226         struct list_head        list;
 227         struct kref             ref;
 228 };
 229
 230 struct dlm_lkb {
 231         struct dlm_rsb          *lkb_resource;  /* the rsb */
 232         struct kref             lkb_ref;
 233         int                     lkb_nodeid;     /* copied from rsb */
 234         int                     lkb_ownpid;     /* pid of lock owner */
 235         uint32_t                lkb_id;         /* our lock ID */
 236         uint32_t                lkb_remid;      /* lock ID on remote partner */
 237         uint32_t                lkb_exflags;    /* external flags from caller */
 238         unsigned long           lkb_sbflags;    /* lksb flags */
 239         unsigned long           lkb_dflags;     /* distributed flags */
 240         unsigned long           lkb_iflags;     /* internal flags */
 241         uint32_t                lkb_lvbseq;     /* lvb sequence number */
 242
 243         int8_t                  lkb_status;     /* granted, waiting, convert */
 244         int8_t                  lkb_rqmode;     /* requested lock mode */
 245         int8_t                  lkb_grmode;     /* granted lock mode */
 246         int8_t                  lkb_highbast;   /* highest mode bast sent for */
 247
 248         int8_t                  lkb_wait_type;  /* type of reply waiting for */
 249         atomic_t                lkb_wait_count;
 250         int                     lkb_wait_nodeid; /* for debugging */
 251
 252         struct list_head        lkb_statequeue; /* rsb g/c/w list */
 253         struct list_head        lkb_rsb_lookup; /* waiting for rsb lookup */
 254         struct list_head        lkb_wait_reply; /* waiting for remote reply */
 255         struct list_head        lkb_ownqueue;   /* list of locks for a process */
 256         ktime_t                 lkb_timestamp;
 257
 258         spinlock_t              lkb_cb_lock;
 259         struct work_struct      lkb_cb_work;
 260         struct list_head        lkb_cb_list; /* for ls_cb_delay or proc->asts */
 261         struct list_head        lkb_callbacks;
 262         struct dlm_callback     *lkb_last_cast;
 263         struct dlm_callback     *lkb_last_cb;
 264         int                     lkb_last_bast_mode;
 265         ktime_t                 lkb_last_cast_time;     /* for debugging */
 266         ktime_t                 lkb_last_bast_time;     /* for debugging */
 267
 268         uint64_t                lkb_recover_seq; /* from ls_recover_seq */
 269
 270         char                    *lkb_lvbptr;
 271         struct dlm_lksb         *lkb_lksb;      /* caller's status block */
 272         void                    (*lkb_astfn) (void *astparam);
 273         void                    (*lkb_bastfn) (void *astparam, int mode);
 274         union {
 275                 void                    *lkb_astparam;  /* caller's ast arg */
 276                 struct dlm_user_args    *lkb_ua;
 277         };
 278 };
 279
 280 /*
 281  * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real
 282  * nodeid, even when nodeid is our_nodeid.
 283  *
 284  * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid,
 285  * greater than zero when another nodeid.
 286  *
 287  * (TODO: remove res_nodeid and only use res_master_nodeid)
 288  */
 289
 290 struct dlm_rsb {
 291         struct dlm_ls           *res_ls;        /* the lockspace */
 292         struct kref             res_ref;
 293         struct mutex            res_mutex;
 294         unsigned long           res_flags;
 295         int                     res_length;     /* length of rsb name */
 296         int                     res_nodeid;
 297         int                     res_master_nodeid;
 298         int                     res_dir_nodeid;
 299         int                     res_id;         /* for ls_recover_idr */
 300         uint32_t                res_lvbseq;
 301         uint32_t                res_hash;
 302         uint32_t                res_bucket;     /* rsbtbl */
 303         unsigned long           res_toss_time;
 304         uint32_t                res_first_lkid;
 305         struct list_head        res_lookup;     /* lkbs waiting on first */
 306         union {
 307                 struct list_head        res_hashchain;
 308                 struct rb_node          res_hashnode;   /* rsbtbl */
 309         };
 310         struct list_head        res_grantqueue;
 311         struct list_head        res_convertqueue;
 312         struct list_head        res_waitqueue;
 313
 314         struct list_head        res_root_list;      /* used for recovery */
 315         struct list_head        res_recover_list;   /* used for recovery */
 316         int                     res_recover_locks_count;
 317
 318         char                    *res_lvbptr;
 319         char                    res_name[DLM_RESNAME_MAXLEN+1];
 320 };
 321
 322 /* dlm_master_lookup() flags */
 323
 324 #define DLM_LU_RECOVER_DIR      1
 325 #define DLM_LU_RECOVER_MASTER   2
 326
 327 /* dlm_master_lookup() results */
 328
 329 #define DLM_LU_MATCH            1
 330 #define DLM_LU_ADD              2
 331
 332 /* find_rsb() flags */
 333
 334 #define R_REQUEST               0x00000001
 335 #define R_RECEIVE_REQUEST       0x00000002
 336 #define R_RECEIVE_RECOVER       0x00000004
 337
 338 /* rsb_flags */
 339
 340 enum rsb_flags {
 341         RSB_MASTER_UNCERTAIN,
 342         RSB_VALNOTVALID,
 343         RSB_VALNOTVALID_PREV,
 344         RSB_NEW_MASTER,
 345         RSB_NEW_MASTER2,
 346         RSB_RECOVER_CONVERT,
 347         RSB_RECOVER_GRANT,
 348         RSB_RECOVER_LVB_INVAL,
 349 };
 350
 351 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
 352 {
 353         __set_bit(flag, &r->res_flags);
 354 }
 355
 356 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
 357 {
 358         __clear_bit(flag, &r->res_flags);
 359 }
 360
 361 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
 362 {
 363         return test_bit(flag, &r->res_flags);
 364 }
 365
 366
 367 /* dlm_header is first element of all structs sent between nodes */
 368
 369 #define DLM_HEADER_MAJOR        0x00030000
 370 #define DLM_HEADER_MINOR        0x00000002
 371
 372 #define DLM_VERSION_3_1         0x00030001
 373 #define DLM_VERSION_3_2         0x00030002
 374
 375 #define DLM_HEADER_SLOTS        0x00000001
 376
 377 #define DLM_MSG                 1
 378 #define DLM_RCOM                2
 379 #define DLM_OPTS                3
 380 #define DLM_ACK                 4
 381 #define DLM_FIN                 5
 382
 383 struct dlm_header {
 384         __le32                  h_version;
 385         union {
 386                 /* for DLM_MSG and DLM_RCOM */
 387                 __le32          h_lockspace;
 388                 /* for DLM_ACK and DLM_OPTS */
 389                 __le32          h_seq;
 390         } u;
 391         __le32                  h_nodeid;       /* nodeid of sender */
 392         __le16                  h_length;
 393         uint8_t                 h_cmd;          /* DLM_MSG, DLM_RCOM */
 394         uint8_t                 h_pad;
 395 };
 396
 397 #define DLM_MSG_REQUEST         1
 398 #define DLM_MSG_CONVERT         2
 399 #define DLM_MSG_UNLOCK          3
 400 #define DLM_MSG_CANCEL          4
 401 #define DLM_MSG_REQUEST_REPLY   5
 402 #define DLM_MSG_CONVERT_REPLY   6
 403 #define DLM_MSG_UNLOCK_REPLY    7
 404 #define DLM_MSG_CANCEL_REPLY    8
 405 #define DLM_MSG_GRANT           9
 406 #define DLM_MSG_BAST            10
 407 #define DLM_MSG_LOOKUP          11
 408 #define DLM_MSG_REMOVE          12
 409 #define DLM_MSG_LOOKUP_REPLY    13
 410 #define DLM_MSG_PURGE           14
 411
 412 struct dlm_message {
 413         struct dlm_header       m_header;
 414         __le32                  m_type;         /* DLM_MSG_ */
 415         __le32                  m_nodeid;
 416         __le32                  m_pid;
 417         __le32                  m_lkid;         /* lkid on sender */
 418         __le32                  m_remid;        /* lkid on receiver */
 419         __le32                  m_parent_lkid;
 420         __le32                  m_parent_remid;
 421         __le32                  m_exflags;
 422         __le32                  m_sbflags;
 423         __le32                  m_flags;
 424         __le32                  m_lvbseq;
 425         __le32                  m_hash;
 426         __le32                  m_status;
 427         __le32                  m_grmode;
 428         __le32                  m_rqmode;
 429         __le32                  m_bastmode;
 430         __le32                  m_asts;
 431         __le32                  m_result;       /* 0 or -EXXX */
 432         char                    m_extra[];      /* name or lvb */
 433 };
 434
 435
 436 #define DLM_RS_NODES            0x00000001
 437 #define DLM_RS_NODES_ALL        0x00000002
 438 #define DLM_RS_DIR              0x00000004
 439 #define DLM_RS_DIR_ALL          0x00000008
 440 #define DLM_RS_LOCKS            0x00000010
 441 #define DLM_RS_LOCKS_ALL        0x00000020
 442 #define DLM_RS_DONE             0x00000040
 443 #define DLM_RS_DONE_ALL         0x00000080
 444
 445 #define DLM_RCOM_STATUS         1
 446 #define DLM_RCOM_NAMES          2
 447 #define DLM_RCOM_LOOKUP         3
 448 #define DLM_RCOM_LOCK           4
 449 #define DLM_RCOM_STATUS_REPLY   5
 450 #define DLM_RCOM_NAMES_REPLY    6
 451 #define DLM_RCOM_LOOKUP_REPLY   7
 452 #define DLM_RCOM_LOCK_REPLY     8
 453
 454 struct dlm_rcom {
 455         struct dlm_header       rc_header;
 456         __le32                  rc_type;        /* DLM_RCOM_ */
 457         __le32                  rc_result;      /* multi-purpose */
 458         __le64                  rc_id;          /* match reply with request */
 459         __le64                  rc_seq;         /* sender's ls_recover_seq */
 460         __le64                  rc_seq_reply;   /* remote ls_recover_seq */
 461         char                    rc_buf[];
 462 };
 463
 464 struct dlm_opt_header {
 465         __le16          t_type;
 466         __le16          t_length;
 467         __le32          t_pad;
 468         /* need to be 8 byte aligned */
 469         char            t_value[];
 470 };
 471
 472 /* encapsulation header */
 473 struct dlm_opts {
 474         struct dlm_header       o_header;
 475         uint8_t                 o_nextcmd;
 476         uint8_t                 o_pad;
 477         __le16                  o_optlen;
 478         __le32                  o_pad2;
 479         char                    o_opts[];
 480 };
 481
 482 union dlm_packet {
 483         struct dlm_header       header;         /* common to other two */
 484         struct dlm_message      message;
 485         struct dlm_rcom         rcom;
 486         struct dlm_opts         opts;
 487 };
 488
 489 #define DLM_RSF_NEED_SLOTS      0x00000001
 490
 491 /* RCOM_STATUS data */
 492 struct rcom_status {
 493         __le32                  rs_flags;
 494         __le32                  rs_unused1;
 495         __le64                  rs_unused2;
 496 };
 497
 498 /* RCOM_STATUS_REPLY data */
 499 struct rcom_config {
 500         __le32                  rf_lvblen;
 501         __le32                  rf_lsflags;
 502
 503         /* DLM_HEADER_SLOTS adds: */
 504         __le32                  rf_flags;
 505         __le16                  rf_our_slot;
 506         __le16                  rf_num_slots;
 507         __le32                  rf_generation;
 508         __le32                  rf_unused1;
 509         __le64                  rf_unused2;
 510 };
 511
 512 struct rcom_slot {
 513         __le32                  ro_nodeid;
 514         __le16                  ro_slot;
 515         __le16                  ro_unused1;
 516         __le64                  ro_unused2;
 517 };
 518
 519 struct rcom_lock {
 520         __le32                  rl_ownpid;
 521         __le32                  rl_lkid;
 522         __le32                  rl_remid;
 523         __le32                  rl_parent_lkid;
 524         __le32                  rl_parent_remid;
 525         __le32                  rl_exflags;
 526         __le32                  rl_flags;
 527         __le32                  rl_lvbseq;
 528         __le32                  rl_result;
 529         int8_t                  rl_rqmode;
 530         int8_t                  rl_grmode;
 531         int8_t                  rl_status;
 532         int8_t                  rl_asts;
 533         __le16                  rl_wait_type;
 534         __le16                  rl_namelen;
 535         char                    rl_name[DLM_RESNAME_MAXLEN];
 536         char                    rl_lvb[];
 537 };
 538
 539 /*
 540  * The max number of resources per rsbtbl bucket that shrink will attempt
 541  * to remove in each iteration.
 542  */
 543
 544 #define DLM_REMOVE_NAMES_MAX 8
 545
 546 struct dlm_ls {
 547         struct list_head        ls_list;        /* list of lockspaces */
 548         dlm_lockspace_t         *ls_local_handle;
 549         uint32_t                ls_global_id;   /* global unique lockspace ID */
 550         uint32_t                ls_generation;
 551         uint32_t                ls_exflags;
 552         int                     ls_lvblen;
 553         atomic_t                ls_count;       /* refcount of processes in
 554                                                    the dlm using this ls */
 555         wait_queue_head_t       ls_count_wait;
 556         int                     ls_create_count; /* create/release refcount */
 557         unsigned long           ls_flags;       /* LSFL_ */
 558         unsigned long           ls_scan_time;
 559         struct kobject          ls_kobj;
 560
 561         struct idr              ls_lkbidr;
 562         spinlock_t              ls_lkbidr_spin;
 563
 564         struct dlm_rsbtable     *ls_rsbtbl;
 565         uint32_t                ls_rsbtbl_size;
 566
 567         struct mutex            ls_waiters_mutex;
 568         struct list_head        ls_waiters;     /* lkbs needing a reply */
 569
 570         struct mutex            ls_orphans_mutex;
 571         struct list_head        ls_orphans;
 572
 573         spinlock_t              ls_new_rsb_spin;
 574         int                     ls_new_rsb_count;
 575         struct list_head        ls_new_rsb;     /* new rsb structs */
 576
 577         char                    *ls_remove_names[DLM_REMOVE_NAMES_MAX];
 578         int                     ls_remove_lens[DLM_REMOVE_NAMES_MAX];
 579
 580         struct list_head        ls_nodes;       /* current nodes in ls */
 581         struct list_head        ls_nodes_gone;  /* dead node list, recovery */
 582         int                     ls_num_nodes;   /* number of nodes in ls */
 583         int                     ls_low_nodeid;
 584         int                     ls_total_weight;
 585         int                     *ls_node_array;
 586
 587         int                     ls_slot;
 588         int                     ls_num_slots;
 589         int                     ls_slots_size;
 590         struct dlm_slot         *ls_slots;
 591
 592         struct dlm_rsb          ls_local_rsb;   /* for returning errors */
 593         struct dlm_lkb          ls_local_lkb;   /* for returning errors */
 594         struct dlm_message      ls_local_ms;    /* for faking a reply */
 595
 596         struct dentry           *ls_debug_rsb_dentry; /* debugfs */
 597         struct dentry           *ls_debug_waiters_dentry; /* debugfs */
 598         struct dentry           *ls_debug_locks_dentry; /* debugfs */
 599         struct dentry           *ls_debug_all_dentry; /* debugfs */
 600         struct dentry           *ls_debug_toss_dentry; /* debugfs */
 601         struct dentry           *ls_debug_queued_asts_dentry; /* debugfs */
 602
 603         wait_queue_head_t       ls_uevent_wait; /* user part of join/leave */
 604         int                     ls_uevent_result;
 605         struct completion       ls_recovery_done;
 606         int                     ls_recovery_result;
 607
 608         struct miscdevice       ls_device;
 609
 610         struct workqueue_struct *ls_callback_wq;
 611
 612         /* recovery related */
 613
 614         spinlock_t              ls_cb_lock;
 615         struct list_head        ls_cb_delay; /* save for queue_work later */
 616         struct timer_list       ls_timer;
 617         struct task_struct      *ls_recoverd_task;
 618         struct mutex            ls_recoverd_active;
 619         spinlock_t              ls_recover_lock;
 620         unsigned long           ls_recover_begin; /* jiffies timestamp */
 621         uint32_t                ls_recover_status; /* DLM_RS_ */
 622         uint64_t                ls_recover_seq;
 623         struct dlm_recover      *ls_recover_args;
 624         struct rw_semaphore     ls_in_recovery; /* block local requests */
 625         struct rw_semaphore     ls_recv_active; /* block dlm_recv */
 626         struct list_head        ls_requestqueue;/* queue remote requests */
 627         atomic_t                ls_requestqueue_cnt;
 628         wait_queue_head_t       ls_requestqueue_wait;
 629         struct mutex            ls_requestqueue_mutex;
 630         struct dlm_rcom         *ls_recover_buf;
 631         int                     ls_recover_nodeid; /* for debugging */
 632         unsigned int            ls_recover_dir_sent_res; /* for log info */
 633         unsigned int            ls_recover_dir_sent_msg; /* for log info */
 634         unsigned int            ls_recover_locks_in; /* for log info */
 635         uint64_t                ls_rcom_seq;
 636         spinlock_t              ls_rcom_spin;
 637         struct list_head        ls_recover_list;
 638         spinlock_t              ls_recover_list_lock;
 639         int                     ls_recover_list_count;
 640         struct idr              ls_recover_idr;
 641         spinlock_t              ls_recover_idr_lock;
 642         wait_queue_head_t       ls_wait_general;
 643         wait_queue_head_t       ls_recover_lock_wait;
 644         spinlock_t              ls_clear_proc_locks;
 645
 646         struct list_head        ls_root_list;   /* root resources */
 647         struct rw_semaphore     ls_root_sem;    /* protect root_list */
 648
 649         const struct dlm_lockspace_ops *ls_ops;
 650         void                    *ls_ops_arg;
 651
 652         int                     ls_namelen;
 653         char                    ls_name[DLM_LOCKSPACE_LEN + 1];
 654 };
 655
 656 /*
 657  * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
 658  * that they should abort what they're doing so new recovery can be started.
 659  *
 660  * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
 661  * should do down_write() on the in_recovery rw_semaphore. (doing down_write
 662  * within dlm_ls_stop causes complaints about the lock acquired/released
 663  * in different contexts.)
 664  *
 665  * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
 666  * It sets this after it is done with down_write() on the in_recovery
 667  * rw_semaphore and clears it after it has released the rw_semaphore.
 668  *
 669  * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
 670  * should begin recovery of the lockspace.
 671  *
 672  * LSFL_RUNNING - set when normal locking activity is enabled.
 673  * dlm_ls_stop() clears this to tell dlm locking routines that they should
 674  * quit what they are doing so recovery can run.  dlm_recoverd sets
 675  * this after recovery is finished.
 676  */
 677
 678 #define LSFL_RECOVER_STOP       0
 679 #define LSFL_RECOVER_DOWN       1
 680 #define LSFL_RECOVER_LOCK       2
 681 #define LSFL_RECOVER_WORK       3
 682 #define LSFL_RUNNING            4
 683
 684 #define LSFL_RCOM_READY         5
 685 #define LSFL_RCOM_WAIT          6
 686 #define LSFL_UEVENT_WAIT        7
 687 #define LSFL_CB_DELAY           9
 688 #define LSFL_NODIR              10
 689
 690 /* much of this is just saving user space pointers associated with the
 691    lock that we pass back to the user lib with an ast */
 692
 693 struct dlm_user_args {
 694         struct dlm_user_proc    *proc; /* each process that opens the lockspace
 695                                           device has private data
 696                                           (dlm_user_proc) on the struct file,
 697                                           the process's locks point back to it*/
 698         struct dlm_lksb         lksb;
 699         struct dlm_lksb __user  *user_lksb;
 700         void __user             *castparam;
 701         void __user             *castaddr;
 702         void __user             *bastparam;
 703         void __user             *bastaddr;
 704         uint64_t                xid;
 705 };
 706
 707 #define DLM_PROC_FLAGS_CLOSING 1
 708 #define DLM_PROC_FLAGS_COMPAT  2
 709
 710 /* locks list is kept so we can remove all a process's locks when it
 711    exits (or orphan those that are persistent) */
 712
 713 struct dlm_user_proc {
 714         dlm_lockspace_t         *lockspace;
 715         unsigned long           flags; /* DLM_PROC_FLAGS */
 716         struct list_head        asts;
 717         spinlock_t              asts_spin;
 718         struct list_head        locks;
 719         spinlock_t              locks_spin;
 720         struct list_head        unlocking;
 721         wait_queue_head_t       wait;
 722 };
 723
 724 static inline int dlm_locking_stopped(struct dlm_ls *ls)
 725 {
 726         return !test_bit(LSFL_RUNNING, &ls->ls_flags);
 727 }
 728
 729 static inline int dlm_recovery_stopped(struct dlm_ls *ls)
 730 {
 731         return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags);
 732 }
 733
 734 static inline int dlm_no_directory(struct dlm_ls *ls)
 735 {
 736         return test_bit(LSFL_NODIR, &ls->ls_flags);
 737 }
 738
 739 /* takes a snapshot from dlm atomic flags */
 740 static inline uint32_t dlm_flags_val(const unsigned long *addr,
 741                                      uint32_t min, uint32_t max)
 742 {
 743         uint32_t bit = min, val = 0;
 744
 745         for_each_set_bit_from(bit, addr, max + 1) {
 746                 val |= BIT(bit);
 747         }
 748
 749         return val;
 750 }
 751
 752 static inline uint32_t dlm_iflags_val(const struct dlm_lkb *lkb)
 753 {
 754         return dlm_flags_val(&lkb->lkb_iflags, __DLM_IFL_MIN_BIT,
 755                              __DLM_IFL_MAX_BIT);
 756 }
 757
 758 static inline uint32_t dlm_dflags_val(const struct dlm_lkb *lkb)
 759 {
 760         return dlm_flags_val(&lkb->lkb_dflags, __DLM_DFL_MIN_BIT,
 761                              __DLM_DFL_MAX_BIT);
 762 }
 763
 764 /* coming from UAPI header
 765  *
 766  * TODO:
 767  * Move this to UAPI header and let other values point to them and use BIT()
 768  */
 769 #define DLM_SBF_DEMOTED_BIT     0
 770 #define __DLM_SBF_MIN_BIT       DLM_SBF_DEMOTED_BIT
 771 #define DLM_SBF_VALNOTVALID_BIT 1
 772 #define DLM_SBF_ALTMODE_BIT     2
 773 #define __DLM_SBF_MAX_BIT       DLM_SBF_ALTMODE_BIT
 774
 775 static inline uint32_t dlm_sbflags_val(const struct dlm_lkb *lkb)
 776 {
 777         /* be sure the next person updates this */
 778         BUILD_BUG_ON(BIT(__DLM_SBF_MAX_BIT) != DLM_SBF_ALTMODE);
 779
 780         return dlm_flags_val(&lkb->lkb_sbflags, __DLM_SBF_MIN_BIT,
 781                              __DLM_SBF_MAX_BIT);
 782 }
 783
 784 static inline void dlm_set_flags_val(unsigned long *addr, uint32_t val,
 785                                      uint32_t min, uint32_t max)
 786 {
 787         uint32_t bit;
 788
 789         for (bit = min; bit < (max + 1); bit++) {
 790                 if (val & BIT(bit))
 791                         set_bit(bit, addr);
 792                 else
 793                         clear_bit(bit, addr);
 794         }
 795 }
 796
 797 static inline void dlm_set_dflags_val(struct dlm_lkb *lkb, uint32_t val)
 798 {
 799         dlm_set_flags_val(&lkb->lkb_dflags, val, __DLM_DFL_MIN_BIT,
 800                           __DLM_DFL_MAX_BIT);
 801 }
 802
 803 static inline void dlm_set_sbflags_val(struct dlm_lkb *lkb, uint32_t val)
 804 {
 805         dlm_set_flags_val(&lkb->lkb_sbflags, val, __DLM_SBF_MIN_BIT,
 806                           __DLM_SBF_MAX_BIT);
 807 }
 808
 809 int dlm_plock_init(void);
 810 void dlm_plock_exit(void);
 811
 812 #ifdef CONFIG_DLM_DEBUG
 813 void dlm_register_debugfs(void);
 814 void dlm_unregister_debugfs(void);
 815 void dlm_create_debug_file(struct dlm_ls *ls);
 816 void dlm_delete_debug_file(struct dlm_ls *ls);
 817 void *dlm_create_debug_comms_file(int nodeid, void *data);
 818 void dlm_delete_debug_comms_file(void *ctx);
 819 #else
 820 static inline void dlm_register_debugfs(void) { }
 821 static inline void dlm_unregister_debugfs(void) { }
 822 static inline void dlm_create_debug_file(struct dlm_ls *ls) { }
 823 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
 824 static inline void *dlm_create_debug_comms_file(int nodeid, void *data) { return NULL; }
 825 static inline void dlm_delete_debug_comms_file(void *ctx) { }
 826 #endif
 827
 828 #endif                          /* __DLM_INTERNAL_DOT_H__ */
 829