lustre/include/lustre_dlm.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * (visit-tags-table FILE)
   3  * vim:expandtab:shiftwidth=8:tabstop=8:
   4  */
   5
   6 #ifndef _LUSTRE_DLM_H__
   7 #define _LUSTRE_DLM_H__
   8
   9 #if defined(__linux__)
  10 #include <linux/lustre_dlm.h>
  11 #elif defined(__APPLE__)
  12 #include <darwin/lustre_dlm.h>
  13 #elif defined(__WINNT__)
  14 #include <winnt/lustre_dlm.h>
  15 #else
  16 #error Unsupported operating system.
  17 #endif
  18
  19 #include <lustre_lib.h>
  20 #include <lustre_net.h>
  21 #include <lustre_import.h>
  22 #include <lustre_handles.h>
  23 #include <lustre_export.h> /* for obd_export, for LDLM_DEBUG */
  24
  25 struct obd_ops;
  26 struct obd_device;
  27
  28 #define OBD_LDLM_DEVICENAME  "ldlm"
  29
  30 #define LDLM_DEFAULT_LRU_SIZE (100 * smp_num_cpus)
  31
  32 typedef enum {
  33         ELDLM_OK = 0,
  34
  35         ELDLM_LOCK_CHANGED = 300,
  36         ELDLM_LOCK_ABORTED = 301,
  37         ELDLM_LOCK_REPLACED = 302,
  38         ELDLM_NO_LOCK_DATA = 303,
  39
  40         ELDLM_NAMESPACE_EXISTS = 400,
  41         ELDLM_BAD_NAMESPACE    = 401
  42 } ldlm_error_t;
  43
  44 #define LDLM_NAMESPACE_SERVER 0
  45 #define LDLM_NAMESPACE_CLIENT 1
  46
  47 #define LDLM_FL_LOCK_CHANGED   0x000001 /* extent, mode, or resource changed */
  48
  49 /* If the server returns one of these flags, then the lock was put on that list.
  50  * If the client sends one of these flags (during recovery ONLY!), it wants the
  51  * lock added to the specified list, no questions asked. -p */
  52 #define LDLM_FL_BLOCK_GRANTED  0x000002
  53 #define LDLM_FL_BLOCK_CONV     0x000004
  54 #define LDLM_FL_BLOCK_WAIT     0x000008
  55
  56 #define LDLM_FL_CBPENDING      0x000010 /* this lock is being destroyed */
  57 #define LDLM_FL_AST_SENT       0x000020 /* blocking or cancel packet was sent */
  58 #define LDLM_FL_WAIT_NOREPROC  0x000040 /* not a real flag, not saved in lock */
  59 #define LDLM_FL_CANCEL         0x000080 /* cancellation callback already run */
  60
  61 /* Lock is being replayed.  This could probably be implied by the fact that one
  62  * of BLOCK_{GRANTED,CONV,WAIT} is set, but that is pretty dangerous. */
  63 #define LDLM_FL_REPLAY         0x000100
  64
  65 #define LDLM_FL_INTENT_ONLY    0x000200 /* don't grant lock, just do intent */
  66 #define LDLM_FL_LOCAL_ONLY     0x000400 /* see ldlm_cli_cancel_unused */
  67
  68 /* don't run the cancel callback under ldlm_cli_cancel_unused */
  69 #define LDLM_FL_FAILED         0x000800
  70
  71 #define LDLM_FL_HAS_INTENT     0x001000 /* lock request has intent */
  72 #define LDLM_FL_CANCELING      0x002000 /* lock cancel has already been sent */
  73 #define LDLM_FL_LOCAL          0x004000 /* local lock (ie, no srv/cli split) */
  74 #define LDLM_FL_WARN           0x008000 /* see ldlm_cli_cancel_unused */
  75 #define LDLM_FL_DISCARD_DATA   0x010000 /* discard (no writeback) on cancel */
  76
  77 #define LDLM_FL_NO_TIMEOUT     0x020000 /* Blocked by group lock - wait
  78                                          * indefinitely */
  79
  80 /* file & record locking */
  81 #define LDLM_FL_BLOCK_NOWAIT   0x040000 // server told not to wait if blocked
  82 #define LDLM_FL_TEST_LOCK      0x080000 // return blocking lock
  83
  84 /* XXX FIXME: This is being added to b_size as a low-risk fix to the fact that
  85  * the LVB filling happens _after_ the lock has been granted, so another thread
  86  * can match before the LVB has been updated.  As a dirty hack, we set
  87  * LDLM_FL_CAN_MATCH only after we've done the LVB poop.
  88  *
  89  * The proper fix is to do the granting inside of the completion AST, which can
  90  * be replaced with a LVB-aware wrapping function for OSC locks.  That change is
  91  * pretty high-risk, though, and would need a lot more testing. */
  92 #define LDLM_FL_CAN_MATCH      0x100000
  93
  94 /* A lock contributes to the kms calculation until it has finished the part
  95  * of it's cancelation that performs write back on its dirty pages.  It
  96  * can remain on the granted list during this whole time.  Threads racing
  97  * to update the kms after performing their writeback need to know to
  98  * exclude each others locks from the calculation as they walk the granted
  99  * list. */
 100 #define LDLM_FL_KMS_IGNORE     0x200000
 101
 102 /* Don't drop lock covering mmapped file in LRU */
 103 #define LDLM_FL_NO_LRU         0x400000
 104
 105 /* Immediatelly cancel such locks when they block some other locks. Send
 106    cancel notification to original lock holder, but expect no reply. */
 107 #define LDLM_FL_CANCEL_ON_BLOCK 0x800000
 108
 109 /* Flags flags inherited from parent lock when doing intents. */
 110 #define LDLM_INHERIT_FLAGS     (LDLM_FL_CANCEL_ON_BLOCK)
 111
 112 /* These are flags that are mapped into the flags and ASTs of blocking locks */
 113 #define LDLM_AST_DISCARD_DATA  0x80000000 /* Add FL_DISCARD to blocking ASTs */
 114 /* Flags sent in AST lock_flags to be mapped into the receiving lock. */
 115 #define LDLM_AST_FLAGS         (LDLM_FL_DISCARD_DATA)
 116
 117 /* completion ast to be executed */
 118 #define LDLM_FL_CP_REQD        0x1000000
 119
 120 /* cleanup_resource has already handled the lock */
 121 #define LDLM_FL_CLEANED        0x2000000
 122
 123 /* optimization hint: LDLM can run blocking callback from current context
 124  * w/o involving separate thread. in order to decrease cs rate */
 125 #define LDLM_FL_ATOMIC_CB      0x4000000
 126
 127 /* while this flag is set, the lock can't change resource */
 128 #define LDLM_FL_LOCK_PROTECT   0x8000000
 129 #define LDLM_FL_LOCK_PROTECT_BIT  27
 130
 131
 132 /* The blocking callback is overloaded to perform two functions.  These flags
 133  * indicate which operation should be performed. */
 134 #define LDLM_CB_BLOCKING    1
 135 #define LDLM_CB_CANCELING   2
 136
 137 /* compatibility matrix */
 138 #define LCK_COMPAT_EX  LCK_NL
 139 #define LCK_COMPAT_PW  (LCK_COMPAT_EX | LCK_CR)
 140 #define LCK_COMPAT_PR  (LCK_COMPAT_PW | LCK_PR)
 141 #define LCK_COMPAT_CW  (LCK_COMPAT_PW | LCK_CW)
 142 #define LCK_COMPAT_CR  (LCK_COMPAT_CW | LCK_PR | LCK_PW)
 143 #define LCK_COMPAT_NL  (LCK_COMPAT_CR | LCK_EX)
 144 #define LCK_COMPAT_GROUP  (LCK_GROUP | LCK_NL)
 145
 146 extern ldlm_mode_t lck_compat_array[];
 147
 148 static inline void lockmode_verify(ldlm_mode_t mode)
 149 {
 150        LASSERT(mode > LCK_MINMODE && mode < LCK_MAXMODE);
 151 }
 152
 153 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
 154 {
 155        return (lck_compat_array[exist] & new);
 156 }
 157
 158 /*
 159  *
 160  * cluster name spaces
 161  *
 162  */
 163
 164 #define DLM_OST_NAMESPACE 1
 165 #define DLM_MDS_NAMESPACE 2
 166
 167 /* XXX
 168    - do we just separate this by security domains and use a prefix for
 169      multiple namespaces in the same domain?
 170    -
 171 */
 172
 173 /*
 174  * Locking rules:
 175  *
 176  * lr_lock
 177  *
 178  * lr_lock
 179  *     waiting_locks_spinlock
 180  *
 181  * lr_lock
 182  *     led_lock
 183  *
 184  * lr_lock
 185  *     ns_unused_lock
 186  *
 187  * lr_lvb_sem
 188  *     lr_lock
 189  *
 190  */
 191
 192 struct ldlm_lock;
 193 struct ldlm_resource;
 194 struct ldlm_namespace;
 195
 196 typedef int (*ldlm_res_policy)(struct ldlm_namespace *, struct ldlm_lock **,
 197                                void *req_cookie, ldlm_mode_t mode, int flags,
 198                                void *data);
 199
 200 struct ldlm_valblock_ops {
 201         int (*lvbo_init)(struct ldlm_resource *res);
 202         int (*lvbo_update)(struct ldlm_resource *res, struct lustre_msg *m,
 203                            int buf_idx, int increase);
 204 };
 205
 206 struct ldlm_namespace {
 207         char                  *ns_name;
 208         __u32                  ns_client; /* is this a client-side lock tree? */
 209         struct list_head      *ns_hash; /* hash table for ns */
 210         spinlock_t             ns_hash_lock;
 211         __u32                  ns_refcount; /* count of resources in the hash */
 212         struct list_head       ns_root_list; /* all root resources in ns */
 213         struct list_head       ns_list_chain; /* position in global NS list */
 214
 215         struct list_head       ns_unused_list; /* all root resources in ns */
 216         int                    ns_nr_unused;
 217         spinlock_t             ns_unused_lock;
 218
 219         unsigned int           ns_max_unused;
 220         cfs_time_t             ns_next_dump;   /* next debug dump, jiffies */
 221
 222         atomic_t               ns_locks;
 223         __u64                  ns_resources;
 224         ldlm_res_policy        ns_policy;
 225         struct ldlm_valblock_ops *ns_lvbo;
 226         void                  *ns_lvbp;
 227         cfs_waitq_t            ns_waitq;
 228 };
 229
 230 /*
 231  *
 232  * Resource hash table
 233  *
 234  */
 235
 236 #define RES_HASH_BITS 10
 237 #define RES_HASH_SIZE (1UL << RES_HASH_BITS)
 238 #define RES_HASH_MASK (RES_HASH_SIZE - 1)
 239
 240 struct ldlm_lock;
 241
 242 typedef int (*ldlm_blocking_callback)(struct ldlm_lock *lock,
 243                                       struct ldlm_lock_desc *new, void *data,
 244                                       int flag);
 245 typedef int (*ldlm_completion_callback)(struct ldlm_lock *lock, int flags,
 246                                         void *data);
 247 typedef int (*ldlm_glimpse_callback)(struct ldlm_lock *lock, void *data);
 248
 249 struct ldlm_lock {
 250         struct portals_handle l_handle; // must be first in the structure
 251         atomic_t              l_refc;
 252
 253         /* ldlm_lock_change_resource() can change this */
 254         struct ldlm_resource *l_resource;
 255
 256         /* set once, no need to protect it */
 257         struct ldlm_lock     *l_parent;
 258
 259         /* protected by ns_hash_lock */
 260         struct list_head      l_children;
 261         struct list_head      l_childof;
 262
 263         /* protected by ns_hash_lock. FIXME */
 264         struct list_head      l_lru;
 265
 266         /* protected by lr_lock */
 267         struct list_head      l_res_link; // position in one of three res lists
 268
 269         /* protected by led_lock */
 270         struct list_head      l_export_chain; // per-export chain of locks
 271
 272         /* protected by lr_lock */
 273         ldlm_mode_t           l_req_mode;
 274         ldlm_mode_t           l_granted_mode;
 275
 276         ldlm_completion_callback l_completion_ast;
 277         ldlm_blocking_callback   l_blocking_ast;
 278         ldlm_glimpse_callback    l_glimpse_ast;
 279
 280         struct obd_export    *l_export;
 281         struct obd_export    *l_conn_export;
 282
 283         /* protected by lr_lock */
 284         __u32                 l_flags;
 285
 286         struct lustre_handle  l_remote_handle;
 287         ldlm_policy_data_t    l_policy_data;
 288
 289         /* protected by lr_lock */
 290         __u32                 l_readers;
 291         __u32                 l_writers;
 292         __u8                  l_destroyed;
 293
 294         /* If the lock is granted, a process sleeps on this waitq to learn when
 295          * it's no longer in use.  If the lock is not granted, a process sleeps
 296          * on this waitq to learn when it becomes granted. */
 297         cfs_waitq_t           l_waitq;
 298         struct timeval        l_enqueued_time;
 299
 300         cfs_time_t            l_last_used;      /* jiffies */
 301         struct ldlm_extent    l_req_extent;
 302
 303         /* Client-side-only members */
 304         __u32                 l_lvb_len;        /* temporary storage for */
 305         void                 *l_lvb_data;       /* an LVB received during */
 306         void                 *l_lvb_swabber;    /* an enqueue */
 307         void                 *l_ast_data;
 308
 309         /* Server-side-only members */
 310
 311         /* protected by elt_lock */
 312         struct list_head      l_pending_chain;  /* callbacks pending */
 313         cfs_time_t            l_callback_timeout; /* jiffies */
 314
 315         __u32                 l_pid;            /* pid which created this lock */
 316         __u32                 l_pidb;           /* who holds LOCK_PROTECT_BIT */
 317
 318         struct list_head      l_tmp;
 319
 320         /* for ldlm_add_ast_work_item() */
 321         struct list_head      l_bl_ast;
 322         struct list_head      l_cp_ast;
 323         struct ldlm_lock     *l_blocking_lock;
 324         int                   l_bl_ast_run;
 325 };
 326
 327 struct ldlm_resource {
 328         struct ldlm_namespace *lr_namespace;
 329
 330         /* protected by ns_hash_lock */
 331         struct list_head       lr_hash;
 332         struct ldlm_resource  *lr_parent;   /* 0 for a root resource */
 333         struct list_head       lr_children; /* list head for child resources */
 334         struct list_head       lr_childof;  /* part of ns_root_list if root res,
 335                                              * part of lr_children if child */
 336         spinlock_t             lr_lock;
 337
 338         /* protected by lr_lock */
 339         struct list_head       lr_granted;
 340         struct list_head       lr_converting;
 341         struct list_head       lr_waiting;
 342         ldlm_mode_t            lr_most_restr;
 343         ldlm_type_t            lr_type; /* LDLM_{PLAIN,EXTENT,FLOCK} */
 344         struct ldlm_res_id     lr_name;
 345         atomic_t               lr_refcount;
 346
 347         /* Server-side-only lock value block elements */
 348         struct semaphore       lr_lvb_sem;
 349         __u32                  lr_lvb_len;
 350         void                  *lr_lvb_data;
 351
 352         /* lr_tmp holds a list head temporarily, during the building of a work
 353          * queue.  see ldlm_add_ast_work_item and ldlm_run_ast_work */
 354         void                  *lr_tmp;
 355 };
 356
 357 struct ldlm_ast_work {
 358         struct ldlm_lock *w_lock;
 359         int               w_blocking;
 360         struct ldlm_lock_desc w_desc;
 361         struct list_head   w_list;
 362         int w_flags;
 363         void *w_data;
 364         int w_datalen;
 365 };
 366
 367 extern struct obd_ops ldlm_obd_ops;
 368
 369 extern char *ldlm_lockname[];
 370 extern char *ldlm_typename[];
 371 extern char *ldlm_it2str(int it);
 372
 373 void ldlm_lock_debug(cfs_debug_limit_state_t *cdls,
 374                      __u32 level, struct ldlm_lock *lock,
 375                      const char *file, const char *func, const int line,
 376                      char *fmt, ...);
 377
 378 #define LDLM_DEBUG(lock, fmt, a...) ldlm_lock_debug(NULL, D_DLMTRACE, lock, \
 379                    __FILE__, __func__, __LINE__, "### " fmt, ## a)
 380
 381 #define LDLM_ERROR(lock, fmt, a...)                                      \
 382 do {                                                                     \
 383         static cfs_debug_limit_state_t cdls;                             \
 384         ldlm_lock_debug(&cdls, D_ERROR, lock,                             \
 385                         __FILE__, __func__, __LINE__, "### " fmt, ## a); \
 386 } while (0)
 387
 388 #define LDLM_DEBUG_NOLOCK(format, a...)                 \
 389         CDEBUG(D_DLMTRACE, "### " format "\n" , ## a)
 390
 391 typedef int (*ldlm_processing_policy)(struct ldlm_lock *lock, int *flags,
 392                                       int first_enq, ldlm_error_t *err,
 393                                       struct list_head *work_list);
 394
 395 /*
 396  * Iterators.
 397  */
 398
 399 #define LDLM_ITER_CONTINUE 1 /* keep iterating */
 400 #define LDLM_ITER_STOP     2 /* stop iterating */
 401
 402 typedef int (*ldlm_iterator_t)(struct ldlm_lock *, void *);
 403 typedef int (*ldlm_res_iterator_t)(struct ldlm_resource *, void *);
 404
 405 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
 406                           void *closure);
 407 int ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
 408                            void *closure);
 409 int ldlm_namespace_foreach_res(struct ldlm_namespace *ns,
 410                                ldlm_res_iterator_t iter, void *closure);
 411
 412 int ldlm_replay_locks(struct obd_import *imp);
 413 void ldlm_resource_iterate(struct ldlm_namespace *, struct ldlm_res_id *,
 414                            ldlm_iterator_t iter, void *data);
 415
 416
 417 /* ldlm_flock.c */
 418 int ldlm_flock_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 419
 420 /* ldlm_extent.c */
 421 __u64 ldlm_extent_shift_kms(struct ldlm_lock *lock, __u64 old_kms);
 422
 423
 424 /* ldlm_lockd.c */
 425 int ldlm_server_blocking_ast(struct ldlm_lock *, struct ldlm_lock_desc *,
 426                              void *data, int flag);
 427 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 428 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data);
 429 int ldlm_handle_enqueue(struct ptlrpc_request *req, ldlm_completion_callback,
 430                         ldlm_blocking_callback, ldlm_glimpse_callback);
 431 int ldlm_handle_convert(struct ptlrpc_request *req);
 432 int ldlm_handle_cancel(struct ptlrpc_request *req);
 433 int ldlm_del_waiting_lock(struct ldlm_lock *lock);
 434 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock);
 435 void ldlm_revoke_export_locks(struct obd_export *exp);
 436 int ldlm_get_ref(void);
 437 void ldlm_put_ref(int force);
 438
 439 /* ldlm_lock.c */
 440 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res);
 441 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg);
 442 void ldlm_lock2handle(const struct ldlm_lock *lock,
 443                       struct lustre_handle *lockh);
 444 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *, int flags);
 445 void ldlm_cancel_callback(struct ldlm_lock *);
 446 int ldlm_lock_set_data(struct lustre_handle *, void *data);
 447 int ldlm_lock_remove_from_lru(struct ldlm_lock *);
 448 struct ldlm_lock *ldlm_handle2lock_ns(struct ldlm_namespace *,
 449                                       const struct lustre_handle *);
 450
 451 static inline struct ldlm_lock *ldlm_handle2lock(const struct lustre_handle *h)
 452 {
 453         return __ldlm_handle2lock(h, 0);
 454 }
 455
 456 #define LDLM_LOCK_PUT(lock)                     \
 457 do {                                            \
 458         /*LDLM_DEBUG((lock), "put");*/          \
 459         ldlm_lock_put(lock);                    \
 460 } while (0)
 461
 462 #define LDLM_LOCK_GET(lock)                     \
 463 ({                                              \
 464         ldlm_lock_get(lock);                    \
 465         /*LDLM_DEBUG((lock), "get");*/          \
 466         lock;                                   \
 467 })
 468
 469 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
 470 void ldlm_lock_put(struct ldlm_lock *lock);
 471 void ldlm_lock_destroy(struct ldlm_lock *lock);
 472 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
 473 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode);
 474 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode);
 475 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode);
 476 void ldlm_lock_allow_match(struct ldlm_lock *lock);
 477 int ldlm_lock_match(struct ldlm_namespace *ns, int flags, struct ldlm_res_id *,
 478                     ldlm_type_t type, ldlm_policy_data_t *, ldlm_mode_t mode,
 479                     struct lustre_handle *);
 480 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
 481                                         int *flags);
 482 void ldlm_lock_cancel(struct ldlm_lock *lock);
 483 void ldlm_cancel_locks_for_export(struct obd_export *export);
 484 void ldlm_reprocess_all(struct ldlm_resource *res);
 485 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns);
 486 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos);
 487 void ldlm_lock_dump_handle(int level, struct lustre_handle *);
 488
 489 /* resource.c */
 490 struct ldlm_namespace *ldlm_namespace_new(char *name, __u32 local);
 491 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, int flags);
 492 int ldlm_namespace_free(struct ldlm_namespace *ns, int force);
 493 int ldlm_proc_setup(void);
 494 #ifdef LPROCFS
 495 void ldlm_proc_cleanup(void);
 496 #else
 497 static inline void ldlm_proc_cleanup(void) {}
 498 #endif
 499
 500 /* resource.c - internal */
 501 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
 502                                         struct ldlm_resource *parent,
 503                                         struct ldlm_res_id, ldlm_type_t type,
 504                                         int create);
 505 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
 506 int ldlm_resource_putref(struct ldlm_resource *res);
 507 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
 508                             struct ldlm_lock *lock);
 509 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
 510 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
 511 void ldlm_dump_all_namespaces(int level);
 512 void ldlm_namespace_dump(int level, struct ldlm_namespace *);
 513 void ldlm_resource_dump(int level, struct ldlm_resource *);
 514 int ldlm_lock_change_resource(struct ldlm_namespace *, struct ldlm_lock *,
 515                               struct ldlm_res_id);
 516
 517 struct ldlm_callback_suite {
 518         ldlm_completion_callback lcs_completion;
 519         ldlm_blocking_callback   lcs_blocking;
 520         ldlm_glimpse_callback    lcs_glimpse;
 521 };
 522
 523 /* ldlm_request.c */
 524 int ldlm_expired_completion_wait(void *data);
 525 int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 526                       void *data, int flag);
 527 int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp);
 528 int ldlm_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 529 int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
 530                      struct ldlm_res_id res_id,
 531                      ldlm_type_t type, ldlm_policy_data_t *policy,
 532                      ldlm_mode_t mode, int *flags,
 533                      ldlm_blocking_callback blocking,
 534                      ldlm_completion_callback completion,
 535                      ldlm_glimpse_callback glimpse,
 536                      void *data, void *lvb, __u32 lvb_len, void *lvb_swabber,
 537                      struct lustre_handle *lockh, int async);
 538 int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req,
 539                          const struct ldlm_request *dlm_req,
 540                          const struct ldlm_callback_suite *cbs);
 541 int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
 542                           ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode,
 543                           int *flags, void *lvb, __u32 lvb_len,
 544                           void *lvb_swabber, struct lustre_handle *lockh,
 545                           int rc);
 546 int ldlm_cli_enqueue_local(struct ldlm_namespace *ns, struct ldlm_res_id res_id,
 547                            ldlm_type_t type, ldlm_policy_data_t *policy,
 548                            ldlm_mode_t mode, int *flags,
 549                            ldlm_blocking_callback blocking,
 550                            ldlm_completion_callback completion,
 551                            ldlm_glimpse_callback glimpse,
 552                            void *data, __u32 lvb_len, void *lvb_swabber,
 553                            struct lustre_handle *lockh);
 554 int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new,
 555                     void *data, __u32 data_len);
 556 int ldlm_cli_convert(struct lustre_handle *, int new_mode, int *flags);
 557 int ldlm_handle_convert0(struct ptlrpc_request *req,
 558                          const struct ldlm_request *dlm_req);
 559 int ldlm_cli_cancel(struct lustre_handle *lockh);
 560 int ldlm_cli_cancel_unused(struct ldlm_namespace *, struct ldlm_res_id *,
 561                            int flags, void *opaque);
 562 int ldlm_cli_join_lru(struct ldlm_namespace *, struct ldlm_res_id *, int join);
 563
 564 /* mds/handler.c */
 565 /* This has to be here because recursive inclusion sucks. */
 566 int intent_disposition(struct ldlm_reply *rep, int flag);
 567 void intent_set_disposition(struct ldlm_reply *rep, int flag);
 568
 569
 570 /* ioctls for trying requests */
 571 #define IOC_LDLM_TYPE                   'f'
 572 #define IOC_LDLM_MIN_NR                 40
 573
 574 #define IOC_LDLM_TEST                   _IOWR('f', 40, long)
 575 #define IOC_LDLM_DUMP                   _IOWR('f', 41, long)
 576 #define IOC_LDLM_REGRESS_START          _IOWR('f', 42, long)
 577 #define IOC_LDLM_REGRESS_STOP           _IOWR('f', 43, long)
 578 #define IOC_LDLM_MAX_NR                 43
 579
 580 static inline void lock_res(struct ldlm_resource *res)
 581 {
 582         spin_lock(&res->lr_lock);
 583 }
 584
 585 static inline void unlock_res(struct ldlm_resource *res)
 586 {
 587         spin_unlock(&res->lr_lock);
 588 }
 589
 590 static inline void check_res_locked(struct ldlm_resource *res)
 591 {
 592         LASSERT_SPIN_LOCKED(&res->lr_lock);
 593 }
 594 #ifdef __KERNEL__
 595 static inline void lock_bitlock(struct ldlm_lock *lock)
 596 {
 597         bit_spin_lock(LDLM_FL_LOCK_PROTECT_BIT, (void *) &lock->l_flags);
 598         LASSERT(lock->l_pidb == 0);
 599         lock->l_pidb = current->pid;
 600 }
 601
 602 static inline void unlock_bitlock(struct ldlm_lock *lock)
 603 {
 604         LASSERT(lock->l_pidb == current->pid);
 605         lock->l_pidb = 0;
 606         bit_spin_unlock(LDLM_FL_LOCK_PROTECT_BIT, (void *) &lock->l_flags);
 607 }
 608 #else
 609 static inline void lock_bitlock(struct ldlm_lock *lock)
 610 {
 611         lock->l_flags |= 1 << LDLM_FL_LOCK_PROTECT_BIT;
 612 }
 613
 614 static inline void unlock_bitlock(struct ldlm_lock *lock)
 615 {
 616         lock->l_flags &= ~(1 << LDLM_FL_LOCK_PROTECT_BIT);
 617 }
 618 #endif
 619 struct ldlm_resource * lock_res_and_lock(struct ldlm_lock *lock);
 620 void unlock_res_and_lock(struct ldlm_lock *lock);
 621
 622 #endif