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