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 #define LDLM_DEFAULT_MAX_ALIVE (cfs_time_seconds(36000))
  32
  33 typedef enum {
  34         ELDLM_OK = 0,
  35
  36         ELDLM_LOCK_CHANGED = 300,
  37         ELDLM_LOCK_ABORTED = 301,
  38         ELDLM_LOCK_REPLACED = 302,
  39         ELDLM_NO_LOCK_DATA = 303,
  40
  41         ELDLM_NAMESPACE_EXISTS = 400,
  42         ELDLM_BAD_NAMESPACE    = 401
  43 } ldlm_error_t;
  44
  45 #define LDLM_NAMESPACE_SERVER 0
  46 #define LDLM_NAMESPACE_CLIENT 1
  47
  48 #define LDLM_FL_LOCK_CHANGED   0x000001 /* extent, mode, or resource changed */
  49
  50 /* If the server returns one of these flags, then the lock was put on that list.
  51  * If the client sends one of these flags (during recovery ONLY!), it wants the
  52  * lock added to the specified list, no questions asked. -p */
  53 #define LDLM_FL_BLOCK_GRANTED  0x000002
  54 #define LDLM_FL_BLOCK_CONV     0x000004
  55 #define LDLM_FL_BLOCK_WAIT     0x000008
  56
  57 #define LDLM_FL_CBPENDING      0x000010 /* this lock is being destroyed */
  58 #define LDLM_FL_AST_SENT       0x000020 /* blocking or cancel packet was sent */
  59 #define LDLM_FL_WAIT_NOREPROC  0x000040 /* not a real flag, not saved in lock */
  60 #define LDLM_FL_CANCEL         0x000080 /* cancellation callback already run */
  61
  62 /* Lock is being replayed.  This could probably be implied by the fact that one
  63  * of BLOCK_{GRANTED,CONV,WAIT} is set, but that is pretty dangerous. */
  64 #define LDLM_FL_REPLAY         0x000100
  65
  66 #define LDLM_FL_INTENT_ONLY    0x000200 /* don't grant lock, just do intent */
  67 #define LDLM_FL_LOCAL_ONLY     0x000400 /* see ldlm_cli_cancel_unused */
  68
  69 /* don't run the cancel callback under ldlm_cli_cancel_unused */
  70 #define LDLM_FL_FAILED         0x000800
  71
  72 #define LDLM_FL_HAS_INTENT     0x001000 /* lock request has intent */
  73 #define LDLM_FL_CANCELING      0x002000 /* lock cancel has already been sent */
  74 #define LDLM_FL_LOCAL          0x004000 /* local lock (ie, no srv/cli split) */
  75 #define LDLM_FL_WARN           0x008000 /* see ldlm_cli_cancel_unused */
  76 #define LDLM_FL_DISCARD_DATA   0x010000 /* discard (no writeback) on cancel */
  77
  78 #define LDLM_FL_NO_TIMEOUT     0x020000 /* Blocked by group lock - wait
  79                                          * indefinitely */
  80
  81 /* file & record locking */
  82 #define LDLM_FL_BLOCK_NOWAIT   0x040000 // server told not to wait if blocked
  83 #define LDLM_FL_TEST_LOCK      0x080000 // return blocking lock
  84
  85 /* XXX FIXME: This is being added to b_size as a low-risk fix to the fact that
  86  * the LVB filling happens _after_ the lock has been granted, so another thread
  87  * can match`t before the LVB has been updated.  As a dirty hack, we set
  88  * LDLM_FL_LVB_READY only after we've done the LVB poop.
  89  * this is only needed on lov/osc now, where lvb is actually used and callers
  90  * must set it in input flags.
  91  *
  92  * The proper fix is to do the granting inside of the completion AST, which can
  93  * be replaced with a LVB-aware wrapping function for OSC locks.  That change is
  94  * pretty high-risk, though, and would need a lot more testing. */
  95
  96 #define LDLM_FL_LVB_READY      0x100000
  97
  98 /* A lock contributes to the kms calculation until it has finished the part
  99  * of it's cancelation that performs write back on its dirty pages.  It
 100  * can remain on the granted list during this whole time.  Threads racing
 101  * to update the kms after performing their writeback need to know to
 102  * exclude each others locks from the calculation as they walk the granted
 103  * list. */
 104 #define LDLM_FL_KMS_IGNORE     0x200000
 105
 106 /* Don't drop lock covering mmapped file in LRU */
 107 #define LDLM_FL_NO_LRU         0x400000
 108
 109 /* Immediatelly cancel such locks when they block some other locks. Send
 110    cancel notification to original lock holder, but expect no reply. */
 111 #define LDLM_FL_CANCEL_ON_BLOCK 0x800000
 112
 113 /* Flags flags inherited from parent lock when doing intents. */
 114 #define LDLM_INHERIT_FLAGS     (LDLM_FL_CANCEL_ON_BLOCK)
 115
 116 /* These are flags that are mapped into the flags and ASTs of blocking locks */
 117 #define LDLM_AST_DISCARD_DATA  0x80000000 /* Add FL_DISCARD to blocking ASTs */
 118 /* Flags sent in AST lock_flags to be mapped into the receiving lock. */
 119 #define LDLM_AST_FLAGS         (LDLM_FL_DISCARD_DATA)
 120
 121 /* completion ast to be executed */
 122 #define LDLM_FL_CP_REQD        0x1000000
 123
 124 /* cleanup_resource has already handled the lock */
 125 #define LDLM_FL_CLEANED        0x2000000
 126
 127 /* optimization hint: LDLM can run blocking callback from current context
 128  * w/o involving separate thread. in order to decrease cs rate */
 129 #define LDLM_FL_ATOMIC_CB      0x4000000
 130
 131 /* while this flag is set, the lock can't change resource */
 132 #define LDLM_FL_LOCK_PROTECT   0x8000000
 133 #define LDLM_FL_LOCK_PROTECT_BIT  27
 134
 135 /* Cancel lock asynchronously. See ldlm_cli_cancel_unused_resource. */
 136 #define LDLM_FL_ASYNC           0x20000000
 137
 138 /* The blocking callback is overloaded to perform two functions.  These flags
 139  * indicate which operation should be performed. */
 140 #define LDLM_CB_BLOCKING    1
 141 #define LDLM_CB_CANCELING   2
 142
 143 /* position flag of skip list pointers */
 144 #define LDLM_SL_HEAD(skip_list)   ((skip_list)->next != NULL)
 145 #define LDLM_SL_TAIL(skip_list)   ((skip_list)->prev != NULL)
 146 #define LDLM_SL_EMPTY(skip_list)  ((skip_list)->next == NULL && \
 147                                    (skip_list)->prev == NULL)
 148
 149 /* compatibility matrix */
 150 #define LCK_COMPAT_EX  LCK_NL
 151 #define LCK_COMPAT_PW  (LCK_COMPAT_EX | LCK_CR)
 152 #define LCK_COMPAT_PR  (LCK_COMPAT_PW | LCK_PR)
 153 #define LCK_COMPAT_CW  (LCK_COMPAT_PW | LCK_CW)
 154 #define LCK_COMPAT_CR  (LCK_COMPAT_CW | LCK_PR | LCK_PW)
 155 #define LCK_COMPAT_NL  (LCK_COMPAT_CR | LCK_EX | LCK_GROUP)
 156 #define LCK_COMPAT_GROUP  (LCK_GROUP | LCK_NL)
 157
 158 extern ldlm_mode_t lck_compat_array[];
 159
 160 static inline void lockmode_verify(ldlm_mode_t mode)
 161 {
 162        LASSERT(mode > LCK_MINMODE && mode < LCK_MAXMODE);
 163 }
 164
 165 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
 166 {
 167        return (lck_compat_array[exist] & new);
 168 }
 169
 170 /*
 171  *
 172  * cluster name spaces
 173  *
 174  */
 175
 176 #define DLM_OST_NAMESPACE 1
 177 #define DLM_MDS_NAMESPACE 2
 178
 179 /* XXX
 180    - do we just separate this by security domains and use a prefix for
 181      multiple namespaces in the same domain?
 182    -
 183 */
 184
 185 /*
 186  * Locking rules:
 187  *
 188  * lr_lock
 189  *
 190  * lr_lock
 191  *     waiting_locks_spinlock
 192  *
 193  * lr_lock
 194  *     led_lock
 195  *
 196  * lr_lock
 197  *     ns_unused_lock
 198  *
 199  * lr_lvb_sem
 200  *     lr_lock
 201  *
 202  */
 203
 204 struct ldlm_lock;
 205 struct ldlm_resource;
 206 struct ldlm_namespace;
 207
 208 typedef int (*ldlm_res_policy)(struct ldlm_namespace *, struct ldlm_lock **,
 209                                void *req_cookie, ldlm_mode_t mode, int flags,
 210                                void *data);
 211
 212 struct ldlm_valblock_ops {
 213         int (*lvbo_init)(struct ldlm_resource *res);
 214         int (*lvbo_update)(struct ldlm_resource *res, struct lustre_msg *m,
 215                            int buf_idx, int increase);
 216 };
 217
 218 struct ldlm_namespace {
 219         char                  *ns_name;
 220         __u32                  ns_client; /* is this a client-side lock tree? */
 221         struct list_head      *ns_hash; /* hash table for ns */
 222         spinlock_t             ns_hash_lock;
 223         __u32                  ns_refcount; /* count of resources in the hash */
 224         struct list_head       ns_root_list; /* all root resources in ns */
 225         struct list_head       ns_list_chain; /* position in global NS list */
 226
 227         struct list_head       ns_unused_list; /* all root resources in ns */
 228         int                    ns_nr_unused;
 229         spinlock_t             ns_unused_lock;
 230
 231         unsigned int           ns_max_unused;
 232         unsigned int           ns_max_age;
 233         cfs_time_t             ns_next_dump;   /* next debug dump, jiffies */
 234
 235         atomic_t               ns_locks;
 236         __u64                  ns_resources;
 237         ldlm_res_policy        ns_policy;
 238         struct ldlm_valblock_ops *ns_lvbo;
 239         void                  *ns_lvbp;
 240         cfs_waitq_t            ns_waitq;
 241 };
 242
 243 /*
 244  *
 245  * Resource hash table
 246  *
 247  */
 248
 249 #define RES_HASH_BITS 10
 250 #define RES_HASH_SIZE (1UL << RES_HASH_BITS)
 251 #define RES_HASH_MASK (RES_HASH_SIZE - 1)
 252
 253 struct ldlm_lock;
 254
 255 typedef int (*ldlm_blocking_callback)(struct ldlm_lock *lock,
 256                                       struct ldlm_lock_desc *new, void *data,
 257                                       int flag);
 258 typedef int (*ldlm_completion_callback)(struct ldlm_lock *lock, int flags,
 259                                         void *data);
 260 typedef int (*ldlm_glimpse_callback)(struct ldlm_lock *lock, void *data);
 261
 262 struct ldlm_lock {
 263         struct portals_handle l_handle; // must be first in the structure
 264         atomic_t              l_refc;
 265
 266         /* ldlm_lock_change_resource() can change this */
 267         struct ldlm_resource *l_resource;
 268
 269         /* protected by ns_hash_lock. FIXME */
 270         struct list_head      l_lru;
 271
 272         /* protected by lr_lock */
 273         struct list_head      l_res_link; // position in one of three res lists
 274
 275         struct list_head      l_sl_mode;        // skip pointer for request mode
 276         struct list_head      l_sl_policy;      // skip pointer for inodebits
 277
 278         /* protected by led_lock */
 279         struct list_head      l_export_chain; // per-export chain of locks
 280
 281         /* protected by lr_lock */
 282         ldlm_mode_t           l_req_mode;
 283         ldlm_mode_t           l_granted_mode;
 284
 285         ldlm_completion_callback l_completion_ast;
 286         ldlm_blocking_callback   l_blocking_ast;
 287         ldlm_glimpse_callback    l_glimpse_ast;
 288
 289         struct obd_export    *l_export;
 290         struct obd_export    *l_conn_export;
 291
 292         /* protected by lr_lock */
 293         __u32                 l_flags;
 294
 295         struct lustre_handle  l_remote_handle;
 296         ldlm_policy_data_t    l_policy_data;
 297
 298         /* protected by lr_lock */
 299         __u32                 l_readers;
 300         __u32                 l_writers;
 301         __u8                  l_destroyed;
 302
 303         /* If the lock is granted, a process sleeps on this waitq to learn when
 304          * it's no longer in use.  If the lock is not granted, a process sleeps
 305          * on this waitq to learn when it becomes granted. */
 306         cfs_waitq_t           l_waitq;
 307         struct timeval        l_enqueued_time;
 308
 309         cfs_time_t            l_last_used;      /* jiffies */
 310         struct ldlm_extent    l_req_extent;
 311
 312         /* Client-side-only members */
 313         __u32                 l_lvb_len;        /* temporary storage for */
 314         void                 *l_lvb_data;       /* an LVB received during */
 315         void                 *l_lvb_swabber;    /* an enqueue */
 316         void                 *l_ast_data;
 317
 318         /* Server-side-only members */
 319
 320         /* protected by elt_lock */
 321         struct list_head      l_pending_chain;  /* callbacks pending */
 322         cfs_time_t            l_callback_timeout; /* jiffies */
 323
 324         __u32                 l_pid;            /* pid which created this lock */
 325         __u32                 l_pidb;           /* who holds LOCK_PROTECT_BIT */
 326
 327         /* for ldlm_add_ast_work_item() */
 328         struct list_head      l_bl_ast;
 329         struct list_head      l_cp_ast;
 330         struct ldlm_lock     *l_blocking_lock;
 331         int                   l_bl_ast_run;
 332 };
 333
 334 struct ldlm_resource {
 335         struct ldlm_namespace *lr_namespace;
 336
 337         /* protected by ns_hash_lock */
 338         struct list_head       lr_hash;
 339         struct ldlm_resource  *lr_parent;   /* 0 for a root resource */
 340         struct list_head       lr_children; /* list head for child resources */
 341         struct list_head       lr_childof;  /* part of ns_root_list if root res,
 342                                              * part of lr_children if child */
 343         spinlock_t             lr_lock;
 344
 345         /* protected by lr_lock */
 346         struct list_head       lr_granted;
 347         struct list_head       lr_converting;
 348         struct list_head       lr_waiting;
 349         ldlm_mode_t            lr_most_restr;
 350         ldlm_type_t            lr_type; /* LDLM_{PLAIN,EXTENT,FLOCK} */
 351         struct ldlm_res_id     lr_name;
 352         atomic_t               lr_refcount;
 353
 354         /* Server-side-only lock value block elements */
 355         struct semaphore       lr_lvb_sem;
 356         __u32                  lr_lvb_len;
 357         void                  *lr_lvb_data;
 358 };
 359
 360 struct ldlm_ast_work {
 361         struct ldlm_lock *w_lock;
 362         int               w_blocking;
 363         struct ldlm_lock_desc w_desc;
 364         struct list_head   w_list;
 365         int w_flags;
 366         void *w_data;
 367         int w_datalen;
 368 };
 369
 370 extern struct obd_ops ldlm_obd_ops;
 371
 372 extern char *ldlm_lockname[];
 373 extern char *ldlm_typename[];
 374 extern char *ldlm_it2str(int it);
 375 #ifdef LIBCFS_DEBUG
 376 #define ldlm_lock_debug(cdls, level, lock, file, func, line, fmt, a...) do { \
 377         CHECK_STACK();                                                  \
 378                                                                         \
 379         if (((level) & D_CANTMASK) != 0 ||                              \
 380             ((libcfs_debug & (level)) != 0 &&                           \
 381              (libcfs_subsystem_debug & DEBUG_SUBSYSTEM) != 0)) {        \
 382                 static struct libcfs_debug_msg_data _ldlm_dbg_data =    \
 383                 DEBUG_MSG_DATA_INIT(cdls, DEBUG_SUBSYSTEM,              \
 384                                     file, func, line);                  \
 385                 _ldlm_lock_debug(lock, level, &_ldlm_dbg_data, fmt,     \
 386                                  ##a );                                 \
 387         }                                                               \
 388 } while(0)
 389
 390 void _ldlm_lock_debug(struct ldlm_lock *lock, __u32 mask,
 391                       struct libcfs_debug_msg_data *data, const char *fmt,
 392                       ...)
 393         __attribute__ ((format (printf, 4, 5)));
 394
 395 #define LDLM_ERROR(lock, fmt, a...) do {                                \
 396         static cfs_debug_limit_state_t _ldlm_cdls;                      \
 397         ldlm_lock_debug(&_ldlm_cdls, D_ERROR, lock,                     \
 398                         __FILE__, __FUNCTION__, __LINE__,               \
 399                         "### " fmt , ##a);                              \
 400 } while (0)
 401
 402 #define LDLM_DEBUG(lock, fmt, a...)   do {                              \
 403         ldlm_lock_debug(NULL, D_DLMTRACE, lock,                         \
 404                         __FILE__, __FUNCTION__, __LINE__,               \
 405                          "### " fmt , ##a);                             \
 406 } while (0)
 407 #else
 408 #define LDLM_DEBUG(lock, fmt, a...) ((void)0)
 409 #define LDLM_ERROR(lock, fmt, a...) ((void)0)
 410 #endif
 411
 412 #define LDLM_DEBUG_NOLOCK(format, a...)                 \
 413         CDEBUG(D_DLMTRACE, "### " format "\n" , ##a)
 414
 415 typedef int (*ldlm_processing_policy)(struct ldlm_lock *lock, int *flags,
 416                                       int first_enq, ldlm_error_t *err,
 417                                       struct list_head *work_list);
 418
 419 /*
 420  * Iterators.
 421  */
 422
 423 #define LDLM_ITER_CONTINUE 1 /* keep iterating */
 424 #define LDLM_ITER_STOP     2 /* stop iterating */
 425
 426 typedef int (*ldlm_iterator_t)(struct ldlm_lock *, void *);
 427 typedef int (*ldlm_res_iterator_t)(struct ldlm_resource *, void *);
 428
 429 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
 430                           void *closure);
 431 int ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
 432                            void *closure);
 433 int ldlm_namespace_foreach_res(struct ldlm_namespace *ns,
 434                                ldlm_res_iterator_t iter, void *closure);
 435
 436 int ldlm_replay_locks(struct obd_import *imp);
 437 void ldlm_resource_iterate(struct ldlm_namespace *, const struct ldlm_res_id *,
 438                            ldlm_iterator_t iter, void *data);
 439
 440
 441 /* ldlm_flock.c */
 442 int ldlm_flock_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 443
 444 /* ldlm_extent.c */
 445 __u64 ldlm_extent_shift_kms(struct ldlm_lock *lock, __u64 old_kms);
 446
 447
 448 /* ldlm_lockd.c */
 449 int ldlm_server_blocking_ast(struct ldlm_lock *, struct ldlm_lock_desc *,
 450                              void *data, int flag);
 451 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 452 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data);
 453 int ldlm_handle_enqueue(struct ptlrpc_request *req, ldlm_completion_callback,
 454                         ldlm_blocking_callback, ldlm_glimpse_callback);
 455 int ldlm_handle_convert(struct ptlrpc_request *req);
 456 int ldlm_handle_cancel(struct ptlrpc_request *req);
 457 int ldlm_request_cancel(struct ptlrpc_request *req,
 458                         const struct ldlm_request *dlm_req, int first);
 459 int ldlm_del_waiting_lock(struct ldlm_lock *lock);
 460 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock);
 461 void ldlm_revoke_export_locks(struct obd_export *exp);
 462 int ldlm_get_ref(void);
 463 void ldlm_put_ref(int force);
 464
 465 /* ldlm_lock.c */
 466 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res);
 467 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg);
 468 void ldlm_lock2handle(const struct ldlm_lock *lock,
 469                       struct lustre_handle *lockh);
 470 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *, int flags);
 471 void ldlm_cancel_callback(struct ldlm_lock *);
 472 int ldlm_lock_set_data(struct lustre_handle *, void *data);
 473 int ldlm_lock_remove_from_lru(struct ldlm_lock *);
 474 struct ldlm_lock *ldlm_handle2lock_ns(struct ldlm_namespace *,
 475                                       const struct lustre_handle *);
 476
 477 static inline struct ldlm_lock *ldlm_handle2lock(const struct lustre_handle *h)
 478 {
 479         return __ldlm_handle2lock(h, 0);
 480 }
 481
 482 #define LDLM_LOCK_PUT(lock)                     \
 483 do {                                            \
 484         /*LDLM_DEBUG((lock), "put");*/          \
 485         ldlm_lock_put(lock);                    \
 486 } while (0)
 487
 488 #define LDLM_LOCK_GET(lock)                     \
 489 ({                                              \
 490         ldlm_lock_get(lock);                    \
 491         /*LDLM_DEBUG((lock), "get");*/          \
 492         lock;                                   \
 493 })
 494
 495 #define ldlm_lock_list_put(head, member, count)                 \
 496 ({                                                              \
 497         struct ldlm_lock *_lock, *_next;                        \
 498         int c = count;                                          \
 499         list_for_each_entry_safe(_lock, _next, head, member) {  \
 500                 list_del_init(&_lock->member);                  \
 501                 LDLM_LOCK_PUT(_lock);                           \
 502                 if (--c == 0)                                   \
 503                         break;                                  \
 504         }                                                       \
 505 })
 506
 507 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
 508 void ldlm_lock_put(struct ldlm_lock *lock);
 509 void ldlm_lock_destroy(struct ldlm_lock *lock);
 510 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
 511 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode);
 512 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode);
 513 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode);
 514 void ldlm_lock_allow_match(struct ldlm_lock *lock);
 515 int ldlm_lock_match(struct ldlm_namespace *ns, int flags,
 516                     const struct ldlm_res_id *,
 517                     ldlm_type_t type, ldlm_policy_data_t *, ldlm_mode_t mode,
 518                     struct lustre_handle *);
 519 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
 520                                         int *flags);
 521 void ldlm_lock_cancel(struct ldlm_lock *lock);
 522 void ldlm_cancel_locks_for_export(struct obd_export *export);
 523 void ldlm_reprocess_all(struct ldlm_resource *res);
 524 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns);
 525 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos);
 526 void ldlm_lock_dump_handle(int level, struct lustre_handle *);
 527 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req);
 528
 529 /* resource.c */
 530 struct ldlm_namespace *ldlm_namespace_new(char *name, __u32 local);
 531 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, int flags);
 532 int ldlm_namespace_free(struct ldlm_namespace *ns, int force);
 533 int ldlm_proc_setup(void);
 534 #ifdef LPROCFS
 535 void ldlm_proc_cleanup(void);
 536 #else
 537 static inline void ldlm_proc_cleanup(void) {}
 538 #endif
 539
 540 /* resource.c - internal */
 541 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
 542                                         struct ldlm_resource *parent,
 543                                         const struct ldlm_res_id *,
 544                                         ldlm_type_t type, int create);
 545 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
 546 int ldlm_resource_putref(struct ldlm_resource *res);
 547 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
 548                             struct ldlm_lock *lock);
 549 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
 550 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
 551 void ldlm_dump_all_namespaces(int level);
 552 void ldlm_namespace_dump(int level, struct ldlm_namespace *);
 553 void ldlm_resource_dump(int level, struct ldlm_resource *);
 554 int ldlm_lock_change_resource(struct ldlm_namespace *, struct ldlm_lock *,
 555                               const struct ldlm_res_id *);
 556
 557 struct ldlm_callback_suite {
 558         ldlm_completion_callback lcs_completion;
 559         ldlm_blocking_callback   lcs_blocking;
 560         ldlm_glimpse_callback    lcs_glimpse;
 561 };
 562
 563 /* ldlm_request.c */
 564 int ldlm_expired_completion_wait(void *data);
 565 int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 566                       void *data, int flag);
 567 int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp);
 568 int ldlm_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 569 int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
 570                      const struct ldlm_res_id *res_id,
 571                      ldlm_type_t type, ldlm_policy_data_t *policy,
 572                      ldlm_mode_t mode, int *flags,
 573                      ldlm_blocking_callback blocking,
 574                      ldlm_completion_callback completion,
 575                      ldlm_glimpse_callback glimpse,
 576                      void *data, void *lvb, __u32 lvb_len, void *lvb_swabber,
 577                      struct lustre_handle *lockh, int async);
 578 struct ptlrpc_request *ldlm_prep_enqueue_req(struct obd_export *exp,
 579                                              int bufcount, int *size,
 580                                              struct list_head *head, int count);
 581 int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req,
 582                          const struct ldlm_request *dlm_req,
 583                          const struct ldlm_callback_suite *cbs);
 584 int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
 585                           ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode,
 586                           int *flags, void *lvb, __u32 lvb_len,
 587                           void *lvb_swabber, struct lustre_handle *lockh,
 588                           int rc);
 589 int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
 590                            const struct ldlm_res_id *res_id,
 591                            ldlm_type_t type, ldlm_policy_data_t *policy,
 592                            ldlm_mode_t mode, int *flags,
 593                            ldlm_blocking_callback blocking,
 594                            ldlm_completion_callback completion,
 595                            ldlm_glimpse_callback glimpse,
 596                            void *data, __u32 lvb_len, void *lvb_swabber,
 597                            struct lustre_handle *lockh);
 598 int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new,
 599                     void *data, __u32 data_len);
 600 int ldlm_cli_convert(struct lustre_handle *, int new_mode, int *flags);
 601 int ldlm_handle_convert0(struct ptlrpc_request *req,
 602                          const struct ldlm_request *dlm_req);
 603 int ldlm_cli_cancel(struct lustre_handle *lockh);
 604 int ldlm_cli_cancel_unused(struct ldlm_namespace *, const struct ldlm_res_id *,
 605                            int flags, void *opaque);
 606 int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
 607                                     const struct ldlm_res_id *res_id,
 608                                     ldlm_policy_data_t *policy,
 609                                     int mode, int flags, void *opaque);
 610 int ldlm_cli_cancel_req(struct obd_export *exp, struct list_head *head,
 611                         int count, int flags);
 612 int ldlm_cli_join_lru(struct ldlm_namespace *,
 613                       const struct ldlm_res_id *, int join);
 614 int ldlm_cancel_resource_local(struct ldlm_resource *res,
 615                                struct list_head *cancels,
 616                                ldlm_policy_data_t *policy,
 617                                ldlm_mode_t mode, int lock_flags,
 618                                int flags, void *opaque);
 619 int ldlm_cli_cancel_list(struct list_head *head, int count,
 620                          struct ptlrpc_request *req, int off, int flags);
 621
 622 /* mds/handler.c */
 623 /* This has to be here because recursive inclusion sucks. */
 624 int intent_disposition(struct ldlm_reply *rep, int flag);
 625 void intent_set_disposition(struct ldlm_reply *rep, int flag);
 626
 627
 628 /* ioctls for trying requests */
 629 #define IOC_LDLM_TYPE                   'f'
 630 #define IOC_LDLM_MIN_NR                 40
 631
 632 #define IOC_LDLM_TEST                   _IOWR('f', 40, long)
 633 #define IOC_LDLM_DUMP                   _IOWR('f', 41, long)
 634 #define IOC_LDLM_REGRESS_START          _IOWR('f', 42, long)
 635 #define IOC_LDLM_REGRESS_STOP           _IOWR('f', 43, long)
 636 #define IOC_LDLM_MAX_NR                 43
 637
 638 static inline void lock_res(struct ldlm_resource *res)
 639 {
 640         spin_lock(&res->lr_lock);
 641 }
 642
 643 static inline void unlock_res(struct ldlm_resource *res)
 644 {
 645         spin_unlock(&res->lr_lock);
 646 }
 647
 648 static inline void check_res_locked(struct ldlm_resource *res)
 649 {
 650         LASSERT_SPIN_LOCKED(&res->lr_lock);
 651 }
 652 #ifdef __KERNEL__
 653 # if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,60)
 654 static inline void lock_bitlock(struct ldlm_lock *lock)
 655 {
 656         bit_spin_lock(LDLM_FL_LOCK_PROTECT_BIT, (void *) &lock->l_flags);
 657         LASSERT(lock->l_pidb == 0);
 658         lock->l_pidb = current->pid;
 659 }
 660
 661 static inline void unlock_bitlock(struct ldlm_lock *lock)
 662 {
 663         LASSERT(lock->l_pidb == current->pid);
 664         lock->l_pidb = 0;
 665         bit_spin_unlock(LDLM_FL_LOCK_PROTECT_BIT, (void *) &lock->l_flags);
 666 }
 667 #else /* LINUX_VERSION_CODE < KERNEL_VERSION(2,5,60) */
 668 static inline void lock_bitlock(struct ldlm_lock *lock)
 669 {
 670 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
 671         /* bit_spin_lock(LDLM_FL_LOCK_PROTECT_BIT, (void *)&lock->l_flags);*/
 672         while (test_and_set_bit(LDLM_FL_LOCK_PROTECT_BIT, &lock->l_flags)) {
 673                 while (test_bit(LDLM_FL_LOCK_PROTECT_BIT, &lock->l_flags))
 674                         cpu_relax();
 675         }
 676 #endif
 677
 678         LASSERT(lock->l_pidb == 0);
 679         lock->l_pidb = current->pid;
 680 }
 681
 682 static inline void unlock_bitlock(struct ldlm_lock *lock)
 683 {
 684         LASSERT(lock->l_pidb == current->pid);
 685         lock->l_pidb = 0;
 686
 687 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
 688         /* bit_spin_unlock(LDLM_FL_LOCK_PROTECT_BIT, (void *)&lock->l_flags);*/
 689         BUG_ON(!test_bit(LDLM_FL_LOCK_PROTECT_BIT, &lock->l_flags));
 690         smp_mb__before_clear_bit();
 691         clear_bit(LDLM_FL_LOCK_PROTECT_BIT, &lock->l_flags);
 692 #endif
 693 }
 694 #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,60) */
 695 #else /* !__KERNEL__ */
 696 static inline void lock_bitlock(struct ldlm_lock *lock)
 697 {
 698         lock->l_flags |= 1 << LDLM_FL_LOCK_PROTECT_BIT;
 699 }
 700
 701 static inline void unlock_bitlock(struct ldlm_lock *lock)
 702 {
 703         lock->l_flags &= ~(1 << LDLM_FL_LOCK_PROTECT_BIT);
 704 }
 705 #endif /* __KERNEL__ */
 706 struct ldlm_resource * lock_res_and_lock(struct ldlm_lock *lock);
 707 void unlock_res_and_lock(struct ldlm_lock *lock);
 708
 709 #endif