lustre/include/linux/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 #ifdef __KERNEL__
  10 # include <linux/proc_fs.h>
  11 #endif
  12
  13 #include <linux/lustre_lib.h>
  14 #include <linux/lustre_net.h>
  15 #include <linux/lustre_import.h>
  16 #include <linux/lustre_handles.h>
  17 #include <linux/lustre_export.h> /* for obd_export, for LDLM_DEBUG */
  18
  19 struct obd_ops;
  20 struct obd_device;
  21
  22 #define OBD_LDLM_DEVICENAME  "ldlm"
  23
  24 #define LDLM_DEFAULT_LRU_SIZE 100
  25
  26 typedef enum {
  27         ELDLM_OK = 0,
  28
  29         ELDLM_LOCK_CHANGED = 300,
  30         ELDLM_LOCK_ABORTED = 301,
  31         ELDLM_LOCK_REPLACED = 302,
  32
  33         ELDLM_NAMESPACE_EXISTS = 400,
  34         ELDLM_BAD_NAMESPACE    = 401
  35 } ldlm_error_t;
  36
  37 #define LDLM_NAMESPACE_SERVER 0
  38 #define LDLM_NAMESPACE_CLIENT 1
  39
  40 #define LDLM_FL_LOCK_CHANGED   0x000001 /* extent, mode, or resource changed */
  41
  42 /* If the server returns one of these flags, then the lock was put on that list.
  43  * If the client sends one of these flags (during recovery ONLY!), it wants the
  44  * lock added to the specified list, no questions asked. -p */
  45 #define LDLM_FL_BLOCK_GRANTED  0x000002
  46 #define LDLM_FL_BLOCK_CONV     0x000004
  47 #define LDLM_FL_BLOCK_WAIT     0x000008
  48
  49 #define LDLM_FL_CBPENDING      0x000010 /* this lock is being destroyed */
  50 #define LDLM_FL_AST_SENT       0x000020 /* blocking or cancel packet was sent */
  51 #define LDLM_FL_WAIT_NOREPROC  0x000040 /* not a real flag, not saved in lock */
  52 #define LDLM_FL_CANCEL         0x000080 /* cancellation callback already run */
  53
  54 /* Lock is being replayed.  This could probably be implied by the fact that one
  55  * of BLOCK_{GRANTED,CONV,WAIT} is set, but that is pretty dangerous. */
  56 #define LDLM_FL_REPLAY         0x000100
  57
  58 #define LDLM_FL_INTENT_ONLY    0x000200 /* don't grant lock, just do intent */
  59 #define LDLM_FL_LOCAL_ONLY     0x000400 /* see ldlm_cli_cancel_unused */
  60
  61 /* don't run the cancel callback under ldlm_cli_cancel_unused */
  62 #define LDLM_FL_NO_CALLBACK    0x000800
  63
  64 #define LDLM_FL_HAS_INTENT     0x001000 /* lock request has intent */
  65 #define LDLM_FL_CANCELING      0x002000 /* lock cancel has already been sent */
  66 #define LDLM_FL_LOCAL          0x004000 /* local lock (ie, no srv/cli split) */
  67 #define LDLM_FL_WARN           0x008000 /* see ldlm_cli_cancel_unused */
  68 #define LDLM_FL_DISCARD_DATA   0x010000 /* discard (no writeback) on cancel */
  69
  70 /* file & record locking */
  71 #define LDLM_FL_BLOCK_NOWAIT   0x040000 // server told not to wait if blocked
  72 #define LDLM_FL_TEST_LOCK      0x080000 // return blocking lock
  73
  74 /* These are flags that are mapped into the flags and ASTs of blocking locks */
  75 #define LDLM_AST_DISCARD_DATA  0x80000000 /* Add FL_DISCARD to blocking ASTs */
  76
  77 /* Flags sent in AST lock_flags to be mapped into the receiving lock. */
  78 #define LDLM_AST_FLAGS         (LDLM_FL_DISCARD_DATA)
  79
  80 /* The blocking callback is overloaded to perform two functions.  These flags
  81  * indicate which operation should be performed. */
  82 #define LDLM_CB_BLOCKING    1
  83 #define LDLM_CB_CANCELING   2
  84
  85 #define L2B(c) (1 << c)
  86
  87 /* compatibility matrix */
  88 #define LCK_COMPAT_EX  L2B(LCK_NL)
  89 #define LCK_COMPAT_PW  (LCK_COMPAT_EX | L2B(LCK_CR))
  90 #define LCK_COMPAT_PR  (LCK_COMPAT_PW | L2B(LCK_PR))
  91 #define LCK_COMPAT_CW  (LCK_COMPAT_PW | L2B(LCK_CW))
  92 #define LCK_COMPAT_CR  (LCK_COMPAT_CW | L2B(LCK_PR) | L2B(LCK_PW))
  93 #define LCK_COMPAT_NL  (LCK_COMPAT_CR | L2B(LCK_EX))
  94
  95 static ldlm_mode_t lck_compat_array[] = {
  96         [LCK_EX] LCK_COMPAT_EX,
  97         [LCK_PW] LCK_COMPAT_PW,
  98         [LCK_PR] LCK_COMPAT_PR,
  99         [LCK_CW] LCK_COMPAT_CW,
 100         [LCK_CR] LCK_COMPAT_CR,
 101         [LCK_NL] LCK_COMPAT_NL
 102 };
 103
 104 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
 105 {
 106        LASSERT(exist >= LCK_EX && exist <= LCK_NL);
 107        LASSERT(new >= LCK_EX && new <= LCK_NL);
 108
 109        return (lck_compat_array[exist] & L2B(new));
 110 }
 111
 112 /*
 113  *
 114  * cluster name spaces
 115  *
 116  */
 117
 118 #define DLM_OST_NAMESPACE 1
 119 #define DLM_MDS_NAMESPACE 2
 120
 121 /* XXX
 122    - do we just separate this by security domains and use a prefix for
 123      multiple namespaces in the same domain?
 124    -
 125 */
 126
 127 struct ldlm_namespace {
 128         char                  *ns_name;
 129         __u32                  ns_client; /* is this a client-side lock tree? */
 130         struct list_head      *ns_hash; /* hash table for ns */
 131         __u32                  ns_refcount; /* count of resources in the hash */
 132         struct list_head       ns_root_list; /* all root resources in ns */
 133         struct lustre_lock     ns_lock; /* protects hash, refcount, list */
 134         struct list_head       ns_list_chain; /* position in global NS list */
 135         /*
 136         struct proc_dir_entry *ns_proc_dir;
 137         */
 138
 139         struct list_head       ns_unused_list; /* all root resources in ns */
 140         int                    ns_nr_unused;
 141         unsigned int           ns_max_unused;
 142
 143         spinlock_t             ns_counter_lock;
 144         __u64                  ns_locks;
 145         __u64                  ns_resources;
 146 };
 147
 148 /*
 149  *
 150  * Resource hash table
 151  *
 152  */
 153
 154 #define RES_HASH_BITS 10
 155 #define RES_HASH_SIZE (1UL << RES_HASH_BITS)
 156 #define RES_HASH_MASK (RES_HASH_SIZE - 1)
 157
 158 struct ldlm_lock;
 159
 160 typedef int (*ldlm_blocking_callback)(struct ldlm_lock *lock,
 161                                       struct ldlm_lock_desc *new, void *data,
 162                                       int flag);
 163 typedef int (*ldlm_completion_callback)(struct ldlm_lock *lock, int flags,
 164                                         void *data);
 165
 166 struct ldlm_lock {
 167         struct portals_handle l_handle; // must be first in the structure
 168         atomic_t              l_refc;
 169         struct ldlm_resource *l_resource;
 170         struct ldlm_lock     *l_parent;
 171         struct list_head      l_children;
 172         struct list_head      l_childof;
 173         struct list_head      l_lru;
 174         struct list_head      l_res_link; // position in one of three res lists
 175         struct list_head      l_export_chain; // per-export chain of locks
 176         struct list_head      l_pending_chain; // locks with callbacks pending
 177         unsigned long         l_callback_timeout;
 178
 179         ldlm_mode_t           l_req_mode;
 180         ldlm_mode_t           l_granted_mode;
 181
 182         ldlm_completion_callback l_completion_ast;
 183         ldlm_blocking_callback   l_blocking_ast;
 184         void                    *l_ast_data;
 185
 186         struct obd_export    *l_export;
 187         /* XXX phil can fix this, I'm sure */
 188         struct obd_export    *l_conn_export;
 189 //        struct lustre_handle *l_connh;
 190         __u32                 l_flags;
 191         struct lustre_handle  l_remote_handle;
 192         ldlm_policy_data_t    l_policy_data;
 193         __u32                 l_version[RES_VERSION_SIZE];
 194
 195         __u32                 l_readers;
 196         __u32                 l_writers;
 197         __u8                  l_destroyed;
 198
 199         /* If the lock is granted, a process sleeps on this waitq to learn when
 200          * it's no longer in use.  If the lock is not granted, a process sleeps
 201          * on this waitq to learn when it becomes granted. */
 202         wait_queue_head_t     l_waitq;
 203         struct timeval        l_enqueued_time;
 204 };
 205
 206 typedef int (*ldlm_res_policy)(struct ldlm_namespace *, struct ldlm_lock **,
 207                                void *req_cookie, ldlm_mode_t mode, int flags,
 208                                void *data);
 209
 210 #define LDLM_PLAIN       10
 211 #define LDLM_EXTENT      11
 212 #define LDLM_FLOCK       12
 213
 214 #define LDLM_MIN_TYPE 10
 215 #define LDLM_MAX_TYPE 12
 216
 217 struct ldlm_resource {
 218         struct ldlm_namespace *lr_namespace;
 219         struct list_head       lr_hash;
 220         struct ldlm_resource  *lr_parent;   /* 0 for a root resource */
 221         struct list_head       lr_children; /* list head for child resources */
 222         struct list_head       lr_childof;  /* part of ns_root_list if root res,
 223                                              * part of lr_children if child */
 224
 225         struct list_head       lr_granted;
 226         struct list_head       lr_converting;
 227         struct list_head       lr_waiting;
 228         ldlm_mode_t            lr_most_restr;
 229         __u32                  lr_type; /* LDLM_PLAIN or LDLM_EXTENT */
 230         struct ldlm_resource  *lr_root;
 231         struct ldlm_res_id     lr_name;
 232         __u32                  lr_version[RES_VERSION_SIZE];
 233         atomic_t               lr_refcount;
 234
 235         /* lr_tmp holds a list head temporarily, during the building of a work
 236          * queue.  see ldlm_add_ast_work_item and ldlm_run_ast_work */
 237         void                  *lr_tmp;
 238 };
 239
 240 struct ldlm_ast_work {
 241         struct ldlm_lock *w_lock;
 242         int               w_blocking;
 243         struct ldlm_lock_desc w_desc;
 244         struct list_head   w_list;
 245         int w_flags;
 246         void *w_data;
 247         int w_datalen;
 248 };
 249
 250 extern struct obd_ops ldlm_obd_ops;
 251
 252 extern char *ldlm_lockname[];
 253 extern char *ldlm_typename[];
 254 extern char *ldlm_it2str(int it);
 255
 256 #define __LDLM_DEBUG(level, lock, format, a...)                               \
 257 do {                                                                          \
 258         if (lock->l_resource == NULL) {                                       \
 259                 CDEBUG(level, "### " format                                   \
 260                        " ns: \?\? lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "\
 261                        "res: \?\? rrc=\?\? type: \?\?\? flags: %x remote: "   \
 262                        LPX64" expref: %d\n" , ## a, lock,                     \
 263                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),   \
 264                        lock->l_readers, lock->l_writers,                      \
 265                        ldlm_lockname[lock->l_granted_mode],                   \
 266                        ldlm_lockname[lock->l_req_mode],                       \
 267                        lock->l_flags, lock->l_remote_handle.cookie,           \
 268                        lock->l_export ?                                       \
 269                        atomic_read(&lock->l_export->exp_refcount) : -99);     \
 270                 break;                                                        \
 271         }                                                                     \
 272         if (lock->l_resource->lr_type == LDLM_EXTENT) {                       \
 273                 CDEBUG(level, "### " format                                   \
 274                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "  \
 275                        "res: "LPU64"/"LPU64" rrc: %d type: %s ["LPU64"->"LPU64\
 276                        "] flags: %x remote: "LPX64" expref: %d\n" , ## a,     \
 277                        lock->l_resource->lr_namespace->ns_name, lock,         \
 278                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),   \
 279                        lock->l_readers, lock->l_writers,                      \
 280                        ldlm_lockname[lock->l_granted_mode],                   \
 281                        ldlm_lockname[lock->l_req_mode],                       \
 282                        lock->l_resource->lr_name.name[0],                     \
 283                        lock->l_resource->lr_name.name[1],                     \
 284                        atomic_read(&lock->l_resource->lr_refcount),           \
 285                        ldlm_typename[lock->l_resource->lr_type],              \
 286                        lock->l_policy_data.l_extent.start,                    \
 287                        lock->l_policy_data.l_extent.end,                      \
 288                        lock->l_flags, lock->l_remote_handle.cookie,           \
 289                        lock->l_export ?                                       \
 290                        atomic_read(&lock->l_export->exp_refcount) : -99);     \
 291                 break;                                                        \
 292         }                                                                     \
 293         if (lock->l_resource->lr_type == LDLM_FLOCK) {                        \
 294                 CDEBUG(level, "### " format                                   \
 295                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "  \
 296                        "res: "LPU64"/"LPU64" rrc: %d type: %s pid: %d "       \
 297                        "["LPU64"->"LPU64"] flags: %x remote: "LPX64           \
 298                        " expref: %d\n" , ## a,                                \
 299                        lock->l_resource->lr_namespace->ns_name, lock,         \
 300                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),   \
 301                        lock->l_readers, lock->l_writers,                      \
 302                        ldlm_lockname[lock->l_granted_mode],                   \
 303                        ldlm_lockname[lock->l_req_mode],                       \
 304                        lock->l_resource->lr_name.name[0],                     \
 305                        lock->l_resource->lr_name.name[1],                     \
 306                        atomic_read(&lock->l_resource->lr_refcount),           \
 307                        ldlm_typename[lock->l_resource->lr_type],              \
 308                        lock->l_policy_data.l_flock.pid,                       \
 309                        lock->l_policy_data.l_flock.start,                     \
 310                        lock->l_policy_data.l_flock.end,                       \
 311                        lock->l_flags, lock->l_remote_handle.cookie,           \
 312                        lock->l_export ?                                       \
 313                        atomic_read(&lock->l_export->exp_refcount) : -99);     \
 314                 break;                                                        \
 315         }                                                                     \
 316         {                                                                     \
 317                 CDEBUG(level, "### " format                                   \
 318                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "  \
 319                        "res: "LPU64"/"LPU64" rrc: %d type: %s flags: %x "     \
 320                        "remote: "LPX64" expref: %d\n" , ## a,                 \
 321                        lock->l_resource->lr_namespace->ns_name,               \
 322                        lock, lock->l_handle.h_cookie,                         \
 323                        atomic_read (&lock->l_refc),                           \
 324                        lock->l_readers, lock->l_writers,                      \
 325                        ldlm_lockname[lock->l_granted_mode],                   \
 326                        ldlm_lockname[lock->l_req_mode],                       \
 327                        lock->l_resource->lr_name.name[0],                     \
 328                        lock->l_resource->lr_name.name[1],                     \
 329                        atomic_read(&lock->l_resource->lr_refcount),           \
 330                        ldlm_typename[lock->l_resource->lr_type],              \
 331                        lock->l_flags, lock->l_remote_handle.cookie,           \
 332                        lock->l_export ?                                       \
 333                        atomic_read(&lock->l_export->exp_refcount) : -99);     \
 334         }                                                                     \
 335 } while (0)
 336
 337 #define LDLM_DEBUG(lock, format, a...) __LDLM_DEBUG(D_DLMTRACE, lock, \
 338                                                     format, ## a)
 339 #define LDLM_ERROR(lock, format, a...) __LDLM_DEBUG(D_ERROR, lock, format, ## a)
 340
 341 #define LDLM_DEBUG_NOLOCK(format, a...)                 \
 342         CDEBUG(D_DLMTRACE, "### " format "\n" , ## a)
 343
 344 /*
 345  * Iterators.
 346  */
 347
 348 #define LDLM_ITER_CONTINUE 1 /* keep iterating */
 349 #define LDLM_ITER_STOP     2 /* stop iterating */
 350
 351 typedef int (*ldlm_iterator_t)(struct ldlm_lock *, void *);
 352 typedef int (*ldlm_res_iterator_t)(struct ldlm_resource *, void *);
 353
 354 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
 355                           void *closure);
 356 int ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
 357                            void *closure);
 358 int ldlm_namespace_foreach_res(struct ldlm_namespace *ns,
 359                                ldlm_res_iterator_t iter, void *closure);
 360
 361 int ldlm_replay_locks(struct obd_import *imp);
 362 void ldlm_change_cbdata(struct ldlm_namespace *, struct ldlm_res_id *,
 363                         ldlm_iterator_t iter, void *data);
 364
 365 /* ldlm_flock.c */
 366 int ldlm_flock_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 367
 368 /* ldlm_lockd.c */
 369 int ldlm_server_blocking_ast(struct ldlm_lock *, struct ldlm_lock_desc *,
 370                              void *data, int flag);
 371 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 372 int ldlm_handle_enqueue(struct ptlrpc_request *req, ldlm_completion_callback,
 373                         ldlm_blocking_callback);
 374 int ldlm_handle_convert(struct ptlrpc_request *req);
 375 int ldlm_handle_cancel(struct ptlrpc_request *req);
 376 int ldlm_del_waiting_lock(struct ldlm_lock *lock);
 377 int ldlm_get_ref(void);
 378 void ldlm_put_ref(int force);
 379
 380 /* ldlm_lock.c */
 381 void ldlm_register_intent(ldlm_res_policy arg);
 382 void ldlm_unregister_intent(void);
 383 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh);
 384 struct ldlm_lock *__ldlm_handle2lock(struct lustre_handle *, int flags);
 385 void ldlm_cancel_callback(struct ldlm_lock *);
 386 int ldlm_lock_set_data(struct lustre_handle *, void *data);
 387 void ldlm_lock_remove_from_lru(struct ldlm_lock *);
 388 struct ldlm_lock *ldlm_handle2lock_ns(struct ldlm_namespace *,
 389                                       struct lustre_handle *);
 390
 391 static inline struct ldlm_lock *ldlm_handle2lock(struct lustre_handle *h)
 392 {
 393         return __ldlm_handle2lock(h, 0);
 394 }
 395
 396 #define LDLM_LOCK_PUT(lock)                     \
 397 do {                                            \
 398         /*LDLM_DEBUG((lock), "put");*/          \
 399         ldlm_lock_put(lock);                    \
 400 } while (0)
 401
 402 #define LDLM_LOCK_GET(lock)                     \
 403 ({                                              \
 404         ldlm_lock_get(lock);                    \
 405         /*LDLM_DEBUG((lock), "get");*/          \
 406         lock;                                   \
 407 })
 408
 409 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
 410 void ldlm_lock_put(struct ldlm_lock *lock);
 411 void ldlm_lock_destroy(struct ldlm_lock *lock);
 412 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
 413 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode);
 414 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode);
 415 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode);
 416 int ldlm_lock_match(struct ldlm_namespace *ns, int flags, struct ldlm_res_id *,
 417                     __u32 type, void *cookie, int cookielen, ldlm_mode_t mode,
 418                     struct lustre_handle *);
 419 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
 420                                         int *flags);
 421 void ldlm_lock_cancel(struct ldlm_lock *lock);
 422 void ldlm_cancel_locks_for_export(struct obd_export *export);
 423 void ldlm_reprocess_all(struct ldlm_resource *res);
 424 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns);
 425 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos);
 426 void ldlm_lock_dump_handle(int level, struct lustre_handle *);
 427
 428 /* ldlm_test.c */
 429 int ldlm_test(struct obd_device *device, struct lustre_handle *connh);
 430 int ldlm_regression_start(struct obd_device *obddev,
 431                           struct lustre_handle *connh,
 432                           unsigned int threads, unsigned int max_locks_in,
 433                           unsigned int num_resources_in,
 434                           unsigned int num_extents_in);
 435 int ldlm_regression_stop(void);
 436
 437
 438 /* resource.c */
 439 struct ldlm_namespace *ldlm_namespace_new(char *name, __u32 local);
 440 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, int flags);
 441 int ldlm_namespace_free(struct ldlm_namespace *ns, int force);
 442 int ldlm_proc_setup(void);
 443 void ldlm_proc_cleanup(void);
 444
 445 /* resource.c - internal */
 446 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
 447                                         struct ldlm_resource *parent,
 448                                         struct ldlm_res_id, __u32 type,
 449                                         int create);
 450 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
 451 int ldlm_resource_putref(struct ldlm_resource *res);
 452 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
 453                             struct ldlm_lock *lock);
 454 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
 455 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
 456 void ldlm_dump_all_namespaces(void);
 457 void ldlm_namespace_dump(struct ldlm_namespace *);
 458 void ldlm_resource_dump(struct ldlm_resource *);
 459 int ldlm_lock_change_resource(struct ldlm_namespace *, struct ldlm_lock *,
 460                               struct ldlm_res_id);
 461
 462 /* ldlm_request.c */
 463 int ldlm_expired_completion_wait(void *data);
 464 int ldlm_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 465 int ldlm_cli_enqueue(struct obd_export *exp,
 466                      struct ptlrpc_request *req,
 467                      struct ldlm_namespace *ns,
 468                      struct lustre_handle *parent_lock_handle,
 469                      struct ldlm_res_id,
 470                      __u32 type,
 471                      void *cookie, int cookielen,
 472                      ldlm_mode_t mode,
 473                      int *flags,
 474                      ldlm_completion_callback completion,
 475                      ldlm_blocking_callback callback,
 476                      void *data,
 477                      struct lustre_handle *lockh);
 478 int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new,
 479                     void *data, __u32 data_len);
 480 int ldlm_cli_convert(struct lustre_handle *, int new_mode, int *flags);
 481 int ldlm_cli_cancel(struct lustre_handle *lockh);
 482 int ldlm_cli_cancel_unused(struct ldlm_namespace *, struct ldlm_res_id *,
 483                            int flags, void *opaque);
 484
 485 /* mds/handler.c */
 486 /* This has to be here because recurisve inclusion sucks. */
 487 int intent_disposition(struct ldlm_reply *rep, int flag);
 488 void intent_set_disposition(struct ldlm_reply *rep, int flag);
 489 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 490                      void *data, int flag);
 491
 492
 493 /* ioctls for trying requests */
 494 #define IOC_LDLM_TYPE                   'f'
 495 #define IOC_LDLM_MIN_NR                 40
 496
 497 #define IOC_LDLM_TEST                   _IOWR('f', 40, long)
 498 #define IOC_LDLM_DUMP                   _IOWR('f', 41, long)
 499 #define IOC_LDLM_REGRESS_START          _IOWR('f', 42, long)
 500 #define IOC_LDLM_REGRESS_STOP           _IOWR('f', 43, long)
 501 #define IOC_LDLM_MAX_NR                 43
 502
 503 #endif