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 <uapi/linux/dlm_device.h>
  20 #include <linux/slab.h>
  21 #include <linux/sched.h>
  22 #include <linux/types.h>
  23 #include <linux/ctype.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/list.h>
  27 #include <linux/errno.h>
  28 #include <linux/random.h>
  29 #include <linux/delay.h>
  30 #include <linux/socket.h>
  31 #include <linux/kthread.h>
  32 #include <linux/kobject.h>
  33 #include <linux/kref.h>
  34 #include <linux/kernel.h>
  35 #include <linux/jhash.h>
  36 #include <linux/miscdevice.h>
  37 #include <linux/rhashtable.h>
  38 #include <linux/mutex.h>
  39 #include <linux/xarray.h>
  40 #include <linux/ratelimit.h>
  41 #include <linux/uaccess.h>
  42
  43 #include <linux/dlm.h>
  44 #include "config.h"
  45
  46 struct dlm_ls;
  47 struct dlm_lkb;
  48 struct dlm_rsb;
  49 struct dlm_member;
  50 struct dlm_rsbtable;
  51 struct dlm_recover;
  52 struct dlm_header;
  53 struct dlm_message;
  54 struct dlm_rcom;
  55 struct dlm_mhandle;
  56 struct dlm_msg;
  57
  58 #define log_print(fmt, args...) \
  59         printk(KERN_ERR "dlm: "fmt"\n" , ##args)
  60 #define log_print_ratelimited(fmt, args...) \
  61         printk_ratelimited(KERN_ERR "dlm: "fmt"\n", ##args)
  62 #define log_error(ls, fmt, args...) \
  63         printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args)
  64
  65 #define log_rinfo(ls, fmt, args...) \
  66 do { \
  67         if (dlm_config.ci_log_info) \
  68                 printk(KERN_INFO "dlm: %s: " fmt "\n", \
  69                         (ls)->ls_name, ##args); \
  70         else if (dlm_config.ci_log_debug) \
  71                 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
  72                        (ls)->ls_name , ##args); \
  73 } while (0)
  74
  75 #define log_debug(ls, fmt, args...) \
  76 do { \
  77         if (dlm_config.ci_log_debug) \
  78                 printk(KERN_DEBUG "dlm: %s: " fmt "\n", \
  79                        (ls)->ls_name , ##args); \
  80 } while (0)
  81
  82 #define log_limit(ls, fmt, args...) \
  83 do { \
  84         if (dlm_config.ci_log_debug) \
  85                 printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \
  86                         (ls)->ls_name , ##args); \
  87 } while (0)
  88
  89 #define DLM_ASSERT(x, do) \
  90 { \
  91   if (!(x)) \
  92   { \
  93     printk(KERN_ERR "\nDLM:  Assertion failed on line %d of file %s\n" \
  94                "DLM:  assertion:  \"%s\"\n" \
  95                "DLM:  time = %lu\n", \
  96                __LINE__, __FILE__, #x, jiffies); \
  97     {do} \
  98     printk("\n"); \
  99     panic("DLM:  Record message above and reboot.\n"); \
 100   } \
 101 }
 102
 103 /*
 104  * Lockspace member (per node in a ls)
 105  */
 106
 107 struct dlm_member {
 108         struct list_head        list;
 109         int                     nodeid;
 110         int                     weight;
 111         int                     slot;
 112         int                     slot_prev;
 113         int                     comm_seq;
 114         uint32_t                generation;
 115 };
 116
 117 /*
 118  * Save and manage recovery state for a lockspace.
 119  */
 120
 121 struct dlm_recover {
 122         struct list_head        list;
 123         struct dlm_config_node  *nodes;
 124         int                     nodes_count;
 125         uint64_t                seq;
 126 };
 127
 128 /*
 129  * Pass input args to second stage locking function.
 130  */
 131
 132 struct dlm_args {
 133         uint32_t                flags;
 134         void                    (*astfn) (void *astparam);
 135         void                    *astparam;
 136         void                    (*bastfn) (void *astparam, int mode);
 137         int                     mode;
 138         struct dlm_lksb         *lksb;
 139 };
 140
 141
 142 /*
 143  * Lock block
 144  *
 145  * A lock can be one of three types:
 146  *
 147  * local copy      lock is mastered locally
 148  *                 (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set)
 149  * process copy    lock is mastered on a remote node
 150  *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set)
 151  * master copy     master node's copy of a lock owned by remote node
 152  *                 (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set)
 153  *
 154  * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or
 155  * dlm_unlock.  The dlm does not modify these or use any private flags in
 156  * this field; it only contains DLM_LKF_ flags from dlm.h.  These flags
 157  * are sent as-is to the remote master when the lock is remote.
 158  *
 159  * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h.
 160  * Some internal flags are shared between the master and process nodes;
 161  * these shared flags are kept in the lower two bytes.  One of these
 162  * flags set on the master copy will be propagated to the process copy
 163  * and v.v.  Other internal flags are private to the master or process
 164  * node (e.g. DLM_IFL_MSTCPY).  These are kept in the high two bytes.
 165  *
 166  * lkb_sbflags: status block flags.  These flags are copied directly into
 167  * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion
 168  * ast.  All defined in dlm.h with DLM_SBF_ prefix.
 169  *
 170  * lkb_status: the lock status indicates which rsb queue the lock is
 171  * on, grant, convert, or wait.  DLM_LKSTS_ WAITING/GRANTED/CONVERT
 172  *
 173  * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a
 174  * reply is needed.  Only set when the lkb is on the lockspace waiters
 175  * list awaiting a reply from a remote node.
 176  *
 177  * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb
 178  * is a master copy, nodeid specifies the remote lock holder, when the
 179  * lkb is a process copy, the nodeid specifies the lock master.
 180  */
 181
 182 /* lkb_status */
 183
 184 #define DLM_LKSTS_WAITING       1
 185 #define DLM_LKSTS_GRANTED       2
 186 #define DLM_LKSTS_CONVERT       3
 187
 188 /* lkb_iflags */
 189
 190 #define DLM_IFL_MSTCPY_BIT      16
 191 #define __DLM_IFL_MIN_BIT       DLM_IFL_MSTCPY_BIT
 192 #define DLM_IFL_RESEND_BIT      17
 193 #define DLM_IFL_DEAD_BIT        18
 194 #define DLM_IFL_OVERLAP_UNLOCK_BIT 19
 195 #define DLM_IFL_OVERLAP_CANCEL_BIT 20
 196 #define DLM_IFL_ENDOFLIFE_BIT   21
 197 #define DLM_IFL_DEADLOCK_CANCEL_BIT 24
 198 #define __DLM_IFL_MAX_BIT       DLM_IFL_DEADLOCK_CANCEL_BIT
 199
 200 /* lkb_dflags */
 201
 202 #define DLM_DFL_USER_BIT        0
 203 #define __DLM_DFL_MIN_BIT       DLM_DFL_USER_BIT
 204 #define DLM_DFL_ORPHAN_BIT      1
 205 #define __DLM_DFL_MAX_BIT       DLM_DFL_ORPHAN_BIT
 206
 207 #define DLM_CB_CAST             0x00000001
 208 #define DLM_CB_BAST             0x00000002
 209
 210 /* much of this is just saving user space pointers associated with the
 211  * lock that we pass back to the user lib with an ast
 212  */
 213
 214 struct dlm_user_args {
 215         struct dlm_user_proc    *proc; /* each process that opens the lockspace
 216                                         * device has private data
 217                                         * (dlm_user_proc) on the struct file,
 218                                         * the process's locks point back to it
 219                                         */
 220         struct dlm_lksb         lksb;
 221         struct dlm_lksb __user  *user_lksb;
 222         void __user             *castparam;
 223         void __user             *castaddr;
 224         void __user             *bastparam;
 225         void __user             *bastaddr;
 226         uint64_t                xid;
 227 };
 228
 229 struct dlm_callback {
 230         uint32_t                flags;          /* DLM_CBF_ */
 231         int                     sb_status;      /* copy to lksb status */
 232         uint8_t                 sb_flags;       /* copy to lksb flags */
 233         int8_t                  mode; /* rq mode of bast, gr mode of cast */
 234         bool                    copy_lvb;
 235         struct dlm_lksb         *lkb_lksb;
 236         unsigned char           lvbptr[DLM_USER_LVB_LEN];
 237
 238         union {
 239                 void                    *astparam;      /* caller's ast arg */
 240                 struct dlm_user_args    ua;
 241         };
 242         struct work_struct      work;
 243         void                    (*bastfn)(void *astparam, int mode);
 244         void                    (*astfn)(void *astparam);
 245         char                    res_name[DLM_RESNAME_MAXLEN];
 246         size_t                  res_length;
 247         uint32_t                ls_id;
 248         uint32_t                lkb_id;
 249
 250         struct list_head        list;
 251 };
 252
 253 struct dlm_lkb {
 254         struct dlm_rsb          *lkb_resource;  /* the rsb */
 255         struct kref             lkb_ref;
 256         int                     lkb_nodeid;     /* copied from rsb */
 257         int                     lkb_ownpid;     /* pid of lock owner */
 258         uint32_t                lkb_id;         /* our lock ID */
 259         uint32_t                lkb_remid;      /* lock ID on remote partner */
 260         uint32_t                lkb_exflags;    /* external flags from caller */
 261         unsigned long           lkb_sbflags;    /* lksb flags */
 262         unsigned long           lkb_dflags;     /* distributed flags */
 263         unsigned long           lkb_iflags;     /* internal flags */
 264         uint32_t                lkb_lvbseq;     /* lvb sequence number */
 265
 266         int8_t                  lkb_status;     /* granted, waiting, convert */
 267         int8_t                  lkb_rqmode;     /* requested lock mode */
 268         int8_t                  lkb_grmode;     /* granted lock mode */
 269         int8_t                  lkb_highbast;   /* highest mode bast sent for */
 270
 271         int8_t                  lkb_wait_type;  /* type of reply waiting for */
 272         int8_t                  lkb_wait_count;
 273         int                     lkb_wait_nodeid; /* for debugging */
 274
 275         struct list_head        lkb_statequeue; /* rsb g/c/w list */
 276         struct list_head        lkb_rsb_lookup; /* waiting for rsb lookup */
 277         struct list_head        lkb_wait_reply; /* waiting for remote reply */
 278         struct list_head        lkb_ownqueue;   /* list of locks for a process */
 279         ktime_t                 lkb_timestamp;
 280
 281         int8_t                  lkb_last_cast_cb_mode;
 282         int8_t                  lkb_last_bast_cb_mode;
 283         int8_t                  lkb_last_cb_mode;
 284         uint8_t                 lkb_last_cb_flags;
 285         ktime_t                 lkb_last_cast_time;     /* for debugging */
 286         ktime_t                 lkb_last_bast_time;     /* for debugging */
 287
 288         uint64_t                lkb_recover_seq; /* from ls_recover_seq */
 289
 290         char                    *lkb_lvbptr;
 291         struct dlm_lksb         *lkb_lksb;      /* caller's status block */
 292         void                    (*lkb_astfn) (void *astparam);
 293         void                    (*lkb_bastfn) (void *astparam, int mode);
 294         union {
 295                 void                    *lkb_astparam;  /* caller's ast arg */
 296                 struct dlm_user_args    *lkb_ua;
 297         };
 298         struct rcu_head         rcu;
 299 };
 300
 301 /*
 302  * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real
 303  * nodeid, even when nodeid is our_nodeid.
 304  *
 305  * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid,
 306  * greater than zero when another nodeid.
 307  *
 308  * (TODO: remove res_nodeid and only use res_master_nodeid)
 309  */
 310
 311 struct dlm_rsb {
 312         struct dlm_ls           *res_ls;        /* the lockspace */
 313         struct kref             res_ref;
 314         spinlock_t              res_lock;
 315         unsigned long           res_flags;
 316         int                     res_length;     /* length of rsb name */
 317         int                     res_nodeid;
 318         int                     res_master_nodeid;
 319         int                     res_dir_nodeid;
 320         unsigned long           res_id;         /* for ls_recover_xa */
 321         uint32_t                res_lvbseq;
 322         uint32_t                res_hash;
 323         unsigned long           res_toss_time;
 324         uint32_t                res_first_lkid;
 325         struct list_head        res_lookup;     /* lkbs waiting on first */
 326         struct rhash_head       res_node;       /* rsbtbl */
 327         struct list_head        res_grantqueue;
 328         struct list_head        res_convertqueue;
 329         struct list_head        res_waitqueue;
 330
 331         struct list_head        res_slow_list;      /* ls_slow_* */
 332         struct list_head        res_scan_list;
 333         struct list_head        res_root_list;      /* used for recovery */
 334         struct list_head        res_masters_list;   /* used for recovery */
 335         struct list_head        res_recover_list;   /* used for recovery */
 336         int                     res_recover_locks_count;
 337         struct rcu_head         rcu;
 338
 339         char                    *res_lvbptr;
 340         char                    res_name[DLM_RESNAME_MAXLEN+1];
 341 };
 342
 343 /* dlm_master_lookup() flags */
 344
 345 #define DLM_LU_RECOVER_DIR      1
 346 #define DLM_LU_RECOVER_MASTER   2
 347
 348 /* dlm_master_lookup() results */
 349
 350 #define DLM_LU_MATCH            1
 351 #define DLM_LU_ADD              2
 352
 353 /* find_rsb() flags */
 354
 355 #define R_REQUEST               0x00000001
 356 #define R_RECEIVE_REQUEST       0x00000002
 357 #define R_RECEIVE_RECOVER       0x00000004
 358
 359 /* rsb_flags */
 360
 361 enum rsb_flags {
 362         RSB_MASTER_UNCERTAIN,
 363         RSB_VALNOTVALID,
 364         RSB_VALNOTVALID_PREV,
 365         RSB_NEW_MASTER,
 366         RSB_NEW_MASTER2,
 367         RSB_RECOVER_CONVERT,
 368         RSB_RECOVER_GRANT,
 369         RSB_RECOVER_LVB_INVAL,
 370         RSB_INACTIVE,
 371         RSB_HASHED, /* set while rsb is on ls_rsbtbl */
 372 };
 373
 374 static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag)
 375 {
 376         __set_bit(flag, &r->res_flags);
 377 }
 378
 379 static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag)
 380 {
 381         __clear_bit(flag, &r->res_flags);
 382 }
 383
 384 static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag)
 385 {
 386         return test_bit(flag, &r->res_flags);
 387 }
 388
 389
 390 /* dlm_header is first element of all structs sent between nodes */
 391
 392 #define DLM_HEADER_MAJOR        0x00030000
 393 #define DLM_HEADER_MINOR        0x00000002
 394
 395 #define DLM_VERSION_3_1         0x00030001
 396 #define DLM_VERSION_3_2         0x00030002
 397
 398 #define DLM_HEADER_SLOTS        0x00000001
 399
 400 #define DLM_MSG                 1
 401 #define DLM_RCOM                2
 402 #define DLM_OPTS                3
 403 #define DLM_ACK                 4
 404 #define DLM_FIN                 5
 405
 406 struct dlm_header {
 407         __le32                  h_version;
 408         union {
 409                 /* for DLM_MSG and DLM_RCOM */
 410                 __le32          h_lockspace;
 411                 /* for DLM_ACK and DLM_OPTS */
 412                 __le32          h_seq;
 413         } u;
 414         __le32                  h_nodeid;       /* nodeid of sender */
 415         __le16                  h_length;
 416         uint8_t                 h_cmd;          /* DLM_MSG, DLM_RCOM */
 417         uint8_t                 h_pad;
 418 };
 419
 420 #define DLM_MSG_REQUEST         1
 421 #define DLM_MSG_CONVERT         2
 422 #define DLM_MSG_UNLOCK          3
 423 #define DLM_MSG_CANCEL          4
 424 #define DLM_MSG_REQUEST_REPLY   5
 425 #define DLM_MSG_CONVERT_REPLY   6
 426 #define DLM_MSG_UNLOCK_REPLY    7
 427 #define DLM_MSG_CANCEL_REPLY    8
 428 #define DLM_MSG_GRANT           9
 429 #define DLM_MSG_BAST            10
 430 #define DLM_MSG_LOOKUP          11
 431 #define DLM_MSG_REMOVE          12
 432 #define DLM_MSG_LOOKUP_REPLY    13
 433 #define DLM_MSG_PURGE           14
 434
 435 struct dlm_message {
 436         struct dlm_header       m_header;
 437         __le32                  m_type;         /* DLM_MSG_ */
 438         __le32                  m_nodeid;
 439         __le32                  m_pid;
 440         __le32                  m_lkid;         /* lkid on sender */
 441         __le32                  m_remid;        /* lkid on receiver */
 442         __le32                  m_parent_lkid;
 443         __le32                  m_parent_remid;
 444         __le32                  m_exflags;
 445         __le32                  m_sbflags;
 446         __le32                  m_flags;
 447         __le32                  m_lvbseq;
 448         __le32                  m_hash;
 449         __le32                  m_status;
 450         __le32                  m_grmode;
 451         __le32                  m_rqmode;
 452         __le32                  m_bastmode;
 453         __le32                  m_asts;
 454         __le32                  m_result;       /* 0 or -EXXX */
 455         char                    m_extra[];      /* name or lvb */
 456 };
 457
 458
 459 #define DLM_RS_NODES            0x00000001
 460 #define DLM_RS_NODES_ALL        0x00000002
 461 #define DLM_RS_DIR              0x00000004
 462 #define DLM_RS_DIR_ALL          0x00000008
 463 #define DLM_RS_LOCKS            0x00000010
 464 #define DLM_RS_LOCKS_ALL        0x00000020
 465 #define DLM_RS_DONE             0x00000040
 466 #define DLM_RS_DONE_ALL         0x00000080
 467
 468 #define DLM_RCOM_STATUS         1
 469 #define DLM_RCOM_NAMES          2
 470 #define DLM_RCOM_LOOKUP         3
 471 #define DLM_RCOM_LOCK           4
 472 #define DLM_RCOM_STATUS_REPLY   5
 473 #define DLM_RCOM_NAMES_REPLY    6
 474 #define DLM_RCOM_LOOKUP_REPLY   7
 475 #define DLM_RCOM_LOCK_REPLY     8
 476
 477 struct dlm_rcom {
 478         struct dlm_header       rc_header;
 479         __le32                  rc_type;        /* DLM_RCOM_ */
 480         __le32                  rc_result;      /* multi-purpose */
 481         __le64                  rc_id;          /* match reply with request */
 482         __le64                  rc_seq;         /* sender's ls_recover_seq */
 483         __le64                  rc_seq_reply;   /* remote ls_recover_seq */
 484         char                    rc_buf[];
 485 };
 486
 487 struct dlm_opt_header {
 488         __le16          t_type;
 489         __le16          t_length;
 490         __le32          t_pad;
 491         /* need to be 8 byte aligned */
 492         char            t_value[];
 493 };
 494
 495 /* encapsulation header */
 496 struct dlm_opts {
 497         struct dlm_header       o_header;
 498         uint8_t                 o_nextcmd;
 499         uint8_t                 o_pad;
 500         __le16                  o_optlen;
 501         __le32                  o_pad2;
 502         char                    o_opts[];
 503 };
 504
 505 union dlm_packet {
 506         struct dlm_header       header;         /* common to other two */
 507         struct dlm_message      message;
 508         struct dlm_rcom         rcom;
 509         struct dlm_opts         opts;
 510 };
 511
 512 #define DLM_RSF_NEED_SLOTS      0x00000001
 513
 514 /* RCOM_STATUS data */
 515 struct rcom_status {
 516         __le32                  rs_flags;
 517         __le32                  rs_unused1;
 518         __le64                  rs_unused2;
 519 };
 520
 521 /* RCOM_STATUS_REPLY data */
 522 struct rcom_config {
 523         __le32                  rf_lvblen;
 524         __le32                  rf_lsflags;
 525
 526         /* DLM_HEADER_SLOTS adds: */
 527         __le32                  rf_flags;
 528         __le16                  rf_our_slot;
 529         __le16                  rf_num_slots;
 530         __le32                  rf_generation;
 531         __le32                  rf_unused1;
 532         __le64                  rf_unused2;
 533 };
 534
 535 struct rcom_slot {
 536         __le32                  ro_nodeid;
 537         __le16                  ro_slot;
 538         __le16                  ro_unused1;
 539         __le64                  ro_unused2;
 540 };
 541
 542 struct rcom_lock {
 543         __le32                  rl_ownpid;
 544         __le32                  rl_lkid;
 545         __le32                  rl_remid;
 546         __le32                  rl_parent_lkid;
 547         __le32                  rl_parent_remid;
 548         __le32                  rl_exflags;
 549         __le32                  rl_flags;
 550         __le32                  rl_lvbseq;
 551         __le32                  rl_result;
 552         int8_t                  rl_rqmode;
 553         int8_t                  rl_grmode;
 554         int8_t                  rl_status;
 555         int8_t                  rl_asts;
 556         __le16                  rl_wait_type;
 557         __le16                  rl_namelen;
 558         char                    rl_name[DLM_RESNAME_MAXLEN];
 559         char                    rl_lvb[];
 560 };
 561
 562 struct dlm_ls {
 563         struct list_head        ls_list;        /* list of lockspaces */
 564         uint32_t                ls_global_id;   /* global unique lockspace ID */
 565         uint32_t                ls_generation;
 566         uint32_t                ls_exflags;
 567         int                     ls_lvblen;
 568         atomic_t                ls_count;       /* refcount of processes in
 569                                                    the dlm using this ls */
 570         wait_queue_head_t       ls_count_wait;
 571         int                     ls_create_count; /* create/release refcount */
 572         unsigned long           ls_flags;       /* LSFL_ */
 573         struct kobject          ls_kobj;
 574
 575         struct xarray           ls_lkbxa;
 576         rwlock_t                ls_lkbxa_lock;
 577
 578         /* an rsb is on rsbtl for primary locking functions,
 579            and on a slow list for recovery/dump iteration  */
 580         struct rhashtable       ls_rsbtbl;
 581         rwlock_t                ls_rsbtbl_lock; /* for ls_rsbtbl and ls_slow */
 582         struct list_head        ls_slow_inactive; /* to iterate rsbtbl */
 583         struct list_head        ls_slow_active;   /* to iterate rsbtbl */
 584
 585         struct timer_list       ls_scan_timer; /* based on first scan_list rsb toss_time */
 586         struct list_head        ls_scan_list;  /* rsbs ordered by res_toss_time */
 587         spinlock_t              ls_scan_lock;
 588
 589         spinlock_t              ls_waiters_lock;
 590         struct list_head        ls_waiters;     /* lkbs needing a reply */
 591
 592         spinlock_t              ls_orphans_lock;
 593         struct list_head        ls_orphans;
 594
 595         struct list_head        ls_nodes;       /* current nodes in ls */
 596         struct list_head        ls_nodes_gone;  /* dead node list, recovery */
 597         int                     ls_num_nodes;   /* number of nodes in ls */
 598         int                     ls_low_nodeid;
 599         int                     ls_total_weight;
 600         int                     *ls_node_array;
 601
 602         int                     ls_slot;
 603         int                     ls_num_slots;
 604         int                     ls_slots_size;
 605         struct dlm_slot         *ls_slots;
 606
 607         struct dlm_rsb          ls_local_rsb;   /* for returning errors */
 608         struct dlm_lkb          ls_local_lkb;   /* for returning errors */
 609         struct dlm_message      ls_local_ms;    /* for faking a reply */
 610
 611         struct dentry           *ls_debug_rsb_dentry; /* debugfs */
 612         struct dentry           *ls_debug_waiters_dentry; /* debugfs */
 613         struct dentry           *ls_debug_locks_dentry; /* debugfs */
 614         struct dentry           *ls_debug_all_dentry; /* debugfs */
 615         struct dentry           *ls_debug_toss_dentry; /* debugfs */
 616         struct dentry           *ls_debug_queued_asts_dentry; /* debugfs */
 617
 618         wait_queue_head_t       ls_uevent_wait; /* user part of join/leave */
 619         int                     ls_uevent_result;
 620         struct completion       ls_recovery_done;
 621         int                     ls_recovery_result;
 622
 623         struct miscdevice       ls_device;
 624
 625         struct workqueue_struct *ls_callback_wq;
 626
 627         /* recovery related */
 628
 629         spinlock_t              ls_cb_lock;
 630         struct list_head        ls_cb_delay; /* save for queue_work later */
 631         struct task_struct      *ls_recoverd_task;
 632         struct mutex            ls_recoverd_active;
 633         spinlock_t              ls_recover_lock;
 634         unsigned long           ls_recover_begin; /* jiffies timestamp */
 635         uint32_t                ls_recover_status; /* DLM_RS_ */
 636         uint64_t                ls_recover_seq;
 637         struct dlm_recover      *ls_recover_args;
 638         struct rw_semaphore     ls_in_recovery; /* block local requests */
 639         rwlock_t                ls_recv_active; /* block dlm_recv */
 640         struct list_head        ls_requestqueue;/* queue remote requests */
 641         rwlock_t                ls_requestqueue_lock;
 642         struct dlm_rcom         *ls_recover_buf;
 643         int                     ls_recover_nodeid; /* for debugging */
 644         unsigned int            ls_recover_locks_in; /* for log info */
 645         uint64_t                ls_rcom_seq;
 646         spinlock_t              ls_rcom_spin;
 647         struct list_head        ls_recover_list;
 648         spinlock_t              ls_recover_list_lock;
 649         int                     ls_recover_list_count;
 650         struct xarray           ls_recover_xa;
 651         spinlock_t              ls_recover_xa_lock;
 652         wait_queue_head_t       ls_wait_general;
 653         wait_queue_head_t       ls_recover_lock_wait;
 654         spinlock_t              ls_clear_proc_locks;
 655
 656         struct list_head        ls_masters_list; /* root resources */
 657         rwlock_t                ls_masters_lock; /* protect root_list */
 658         struct list_head        ls_dir_dump_list; /* root resources */
 659         rwlock_t                ls_dir_dump_lock; /* protect root_list */
 660
 661         const struct dlm_lockspace_ops *ls_ops;
 662         void                    *ls_ops_arg;
 663
 664         struct work_struct      ls_free_work;
 665
 666         int                     ls_namelen;
 667         char                    ls_name[DLM_LOCKSPACE_LEN + 1];
 668 };
 669
 670 /*
 671  * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines
 672  * that they should abort what they're doing so new recovery can be started.
 673  *
 674  * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it
 675  * should do down_write() on the in_recovery rw_semaphore. (doing down_write
 676  * within dlm_ls_stop causes complaints about the lock acquired/released
 677  * in different contexts.)
 678  *
 679  * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore.
 680  * It sets this after it is done with down_write() on the in_recovery
 681  * rw_semaphore and clears it after it has released the rw_semaphore.
 682  *
 683  * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it
 684  * should begin recovery of the lockspace.
 685  *
 686  * LSFL_RUNNING - set when normal locking activity is enabled.
 687  * dlm_ls_stop() clears this to tell dlm locking routines that they should
 688  * quit what they are doing so recovery can run.  dlm_recoverd sets
 689  * this after recovery is finished.
 690  */
 691
 692 #define LSFL_RECOVER_STOP       0
 693 #define LSFL_RECOVER_DOWN       1
 694 #define LSFL_RECOVER_LOCK       2
 695 #define LSFL_RECOVER_WORK       3
 696 #define LSFL_RUNNING            4
 697
 698 #define LSFL_RCOM_READY         5
 699 #define LSFL_RCOM_WAIT          6
 700 #define LSFL_UEVENT_WAIT        7
 701 #define LSFL_CB_DELAY           9
 702 #define LSFL_NODIR              10
 703 #define LSFL_RECV_MSG_BLOCKED   11
 704 #define LSFL_FS                 12
 705 #define LSFL_SOFTIRQ            13
 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 extern struct workqueue_struct *dlm_wq;
 810
 811 int dlm_plock_init(void);
 812 void dlm_plock_exit(void);
 813
 814 #ifdef CONFIG_DLM_DEBUG
 815 void dlm_register_debugfs(void);
 816 void dlm_unregister_debugfs(void);
 817 void dlm_create_debug_file(struct dlm_ls *ls);
 818 void dlm_delete_debug_file(struct dlm_ls *ls);
 819 void *dlm_create_debug_comms_file(int nodeid, void *data);
 820 void dlm_delete_debug_comms_file(void *ctx);
 821 #else
 822 static inline void dlm_register_debugfs(void) { }
 823 static inline void dlm_unregister_debugfs(void) { }
 824 static inline void dlm_create_debug_file(struct dlm_ls *ls) { }
 825 static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
 826 static inline void *dlm_create_debug_comms_file(int nodeid, void *data) { return NULL; }
 827 static inline void dlm_delete_debug_comms_file(void *ctx) { }
 828 #endif
 829
 830 #endif                          /* __DLM_INTERNAL_DOT_H__ */
 831