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         ELDLM_NO_LOCK_DATA = 303,
  33
  34         ELDLM_NAMESPACE_EXISTS = 400,
  35         ELDLM_BAD_NAMESPACE    = 401
  36 } ldlm_error_t;
  37
  38 #define LDLM_NAMESPACE_SERVER 0
  39 #define LDLM_NAMESPACE_CLIENT 1
  40
  41 #define LDLM_FL_LOCK_CHANGED   0x000001 /* extent, mode, or resource changed */
  42
  43 /* If the server returns one of these flags, then the lock was put on that list.
  44  * If the client sends one of these flags (during recovery ONLY!), it wants the
  45  * lock added to the specified list, no questions asked. -p */
  46 #define LDLM_FL_BLOCK_GRANTED  0x000002
  47 #define LDLM_FL_BLOCK_CONV     0x000004
  48 #define LDLM_FL_BLOCK_WAIT     0x000008
  49
  50 #define LDLM_FL_CBPENDING      0x000010 /* this lock is being destroyed */
  51 #define LDLM_FL_AST_SENT       0x000020 /* blocking or cancel packet was sent */
  52 #define LDLM_FL_WAIT_NOREPROC  0x000040 /* not a real flag, not saved in lock */
  53 #define LDLM_FL_CANCEL         0x000080 /* cancellation callback already run */
  54
  55 /* Lock is being replayed.  This could probably be implied by the fact that one
  56  * of BLOCK_{GRANTED,CONV,WAIT} is set, but that is pretty dangerous. */
  57 #define LDLM_FL_REPLAY         0x000100
  58
  59 #define LDLM_FL_INTENT_ONLY    0x000200 /* don't grant lock, just do intent */
  60 #define LDLM_FL_LOCAL_ONLY     0x000400 /* see ldlm_cli_cancel_unused */
  61
  62 /* don't run the cancel callback under ldlm_cli_cancel_unused */
  63 #define LDLM_FL_FAILED         0x000800
  64
  65 #define LDLM_FL_HAS_INTENT     0x001000 /* lock request has intent */
  66 #define LDLM_FL_CANCELING      0x002000 /* lock cancel has already been sent */
  67 #define LDLM_FL_LOCAL          0x004000 /* local lock (ie, no srv/cli split) */
  68 #define LDLM_FL_WARN           0x008000 /* see ldlm_cli_cancel_unused */
  69 #define LDLM_FL_DISCARD_DATA   0x010000 /* discard (no writeback) on cancel */
  70 #define LDLM_FL_CONFIG_CHANGE  0x020000 /* see ldlm_cli_cancel_unused */
  71
  72 #define LDLM_FL_NO_TIMEOUT     0x020000 /* Blocked by group lock - wait
  73                                          * indefinitely */
  74
  75 /* file & record locking */
  76 #define LDLM_FL_BLOCK_NOWAIT   0x040000 /* server told not to wait if blocked */
  77 #define LDLM_FL_TEST_LOCK      0x080000 /* return blocking lock */
  78
  79 /* These are flags that are mapped into the flags and ASTs of blocking locks */
  80 #define LDLM_AST_DISCARD_DATA  0x80000000 /* Add FL_DISCARD to blocking ASTs */
  81 /* Flags sent in AST lock_flags to be mapped into the receiving lock. */
  82 #define LDLM_AST_FLAGS         (LDLM_FL_DISCARD_DATA)
  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 /* completion ast to be executed */
 103 #define LDLM_FL_CP_REQD        0x400000
 104
 105 /* cleanup_resource has already handled the lock */
 106 #define LDLM_FL_CLEANED        0x800000
 107
 108 /* optimization hint: LDLM can run blocking callback from current context
 109  * w/o involving separate thread. in order to decrease cs rate */
 110 #define LDLM_FL_ATOMIC_CB      0x1000000
 111
 112 /* while this flag is set, the lock can't change resource */
 113 #define LDLM_FL_LOCK_PROTECT   0x4000000
 114 #define LDLM_FL_LOCK_PROTECT_BIT  26
 115
 116 /* The blocking callback is overloaded to perform two functions.  These flags
 117  * indicate which operation should be performed. */
 118 #define LDLM_CB_BLOCKING    1
 119 #define LDLM_CB_CANCELING   2
 120
 121 /* compatibility matrix */
 122 #define LCK_COMPAT_EX  LCK_NL
 123 #define LCK_COMPAT_PW  (LCK_COMPAT_EX | LCK_CR)
 124 #define LCK_COMPAT_PR  (LCK_COMPAT_PW | LCK_PR)
 125 #define LCK_COMPAT_CW  (LCK_COMPAT_PW | LCK_CW)
 126 #define LCK_COMPAT_CR  (LCK_COMPAT_CW | LCK_PR | LCK_PW)
 127 #define LCK_COMPAT_NL  (LCK_COMPAT_CR | LCK_EX)
 128 #define LCK_COMPAT_GROUP  (LCK_GROUP | LCK_NL)
 129
 130 static ldlm_mode_t lck_compat_array[] = {
 131         [LCK_EX] LCK_COMPAT_EX,
 132         [LCK_PW] LCK_COMPAT_PW,
 133         [LCK_PR] LCK_COMPAT_PR,
 134         [LCK_CW] LCK_COMPAT_CW,
 135         [LCK_CR] LCK_COMPAT_CR,
 136         [LCK_NL] LCK_COMPAT_NL,
 137         [LCK_GROUP] LCK_COMPAT_GROUP
 138 };
 139
 140 static inline void lockmode_verify(ldlm_mode_t mode)
 141 {
 142        LASSERT(mode >= LCK_EX && mode <= LCK_GROUP);
 143 }
 144
 145 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
 146 {
 147        return (lck_compat_array[exist] & new);
 148 }
 149
 150 /*
 151  *
 152  * cluster name spaces
 153  *
 154  */
 155
 156 #define DLM_OST_NAMESPACE 1
 157 #define DLM_MDS_NAMESPACE 2
 158
 159 /* XXX
 160    - do we just separate this by security domains and use a prefix for
 161      multiple namespaces in the same domain?
 162    -
 163 */
 164
 165 /*
 166  * Locking rules:
 167  *
 168  * lr_lock
 169  *
 170  * lr_lock
 171  *     waiting_locks_spinlock
 172  *
 173  * lr_lock
 174  *     led_lock
 175  *
 176  * lr_lock
 177  *     ns_unused_lock
 178  *
 179  * lr_lvb_sem
 180  *     lr_lock
 181  *
 182  */
 183
 184 struct ldlm_lock;
 185 struct ldlm_resource;
 186 struct ldlm_namespace;
 187
 188 typedef int (*ldlm_res_policy)(struct ldlm_namespace *, struct ldlm_lock **,
 189                                void *req_cookie, ldlm_mode_t mode, int flags,
 190                                void *data);
 191
 192 struct ldlm_valblock_ops {
 193         int (*lvbo_init)(struct ldlm_resource *res);
 194
 195         int (*lvbo_update)(struct ldlm_resource *res,
 196                            struct lustre_msg *m,
 197                            int buf_idx, int increase);
 198 };
 199
 200 struct ldlm_namespace {
 201         char                  *ns_name;
 202         __u32                  ns_client; /* is this a client-side lock tree? */
 203         struct list_head      *ns_hash; /* hash table for ns */
 204         spinlock_t             ns_hash_lock;
 205         __u32                  ns_refcount; /* count of resources in the hash */
 206         struct list_head       ns_root_list; /* all root resources in ns */
 207         struct list_head       ns_list_chain; /* position in global NS list */
 208         /*
 209         struct proc_dir_entry *ns_proc_dir;
 210         */
 211
 212         struct list_head       ns_unused_list; /* all root resources in ns */
 213         int                    ns_nr_unused;
 214         spinlock_t             ns_unused_lock;
 215
 216         unsigned int           ns_max_unused;
 217         unsigned long          ns_next_dump;   /* next dump time */
 218
 219         atomic_t               ns_locks;
 220         __u64                  ns_resources;
 221         ldlm_res_policy        ns_policy;
 222         struct ldlm_valblock_ops *ns_lvbo;
 223         void                  *ns_lvbp;
 224         wait_queue_head_t      ns_waitq;
 225 };
 226
 227 /*
 228  *
 229  * Resource hash table
 230  *
 231  */
 232
 233 #define RES_HASH_BITS 10
 234 #define RES_HASH_SIZE (1UL << RES_HASH_BITS)
 235 #define RES_HASH_MASK (RES_HASH_SIZE - 1)
 236
 237 struct ldlm_lock;
 238
 239 typedef int (*ldlm_blocking_callback)(struct ldlm_lock *lock,
 240                                       struct ldlm_lock_desc *new, void *data,
 241                                       int flag);
 242 typedef int (*ldlm_completion_callback)(struct ldlm_lock *lock, int flags,
 243                                         void *data);
 244 typedef int (*ldlm_glimpse_callback)(struct ldlm_lock *lock, void *data);
 245
 246 struct ldlm_lock {
 247         struct portals_handle l_handle; // must be first in the structure
 248         atomic_t              l_refc;
 249
 250         /* ldlm_lock_change_resource() can change this */
 251         struct ldlm_resource *l_resource;
 252
 253         /* set once, no need to protect it */
 254         struct ldlm_lock     *l_parent;
 255
 256         /* protected by ns_hash_lock */
 257         struct list_head      l_children;
 258         struct list_head      l_childof;
 259
 260         /* protected by ns_hash_lock. FIXME */
 261         struct list_head      l_lru;
 262
 263         /* protected by lr_lock */
 264         struct list_head      l_res_link; // position in one of three res lists
 265
 266         /* protected by led_lock */
 267         struct list_head      l_export_chain; // per-export chain of locks
 268
 269         /* protected by lr_lock */
 270         ldlm_mode_t           l_req_mode;
 271         ldlm_mode_t           l_granted_mode;
 272
 273         ldlm_completion_callback l_completion_ast;
 274         ldlm_blocking_callback   l_blocking_ast;
 275         ldlm_glimpse_callback    l_glimpse_ast;
 276
 277         struct obd_export    *l_export;
 278         struct obd_export    *l_conn_export;
 279
 280         /* protected by lr_lock */
 281         __u32                 l_flags;
 282
 283         struct lustre_handle  l_remote_handle;
 284         ldlm_policy_data_t    l_policy_data;
 285
 286         /* protected by lr_lock */
 287         __u32                 l_readers;
 288         __u32                 l_writers;
 289         __u8                  l_destroyed;
 290
 291         /* If the lock is granted, a process sleeps on this waitq to learn when
 292          * it's no longer in use.  If the lock is not granted, a process sleeps
 293          * on this waitq to learn when it becomes granted. */
 294         wait_queue_head_t     l_waitq;
 295         struct timeval        l_enqueued_time;
 296
 297         unsigned long         l_last_used;      /* jiffies */
 298         struct ldlm_extent    l_req_extent;
 299
 300         /* Client-side-only members */
 301         __u32                 l_lvb_len;        /* temporary storage for */
 302         void                 *l_lvb_data;       /* an LVB received during */
 303         void                 *l_lvb_swabber;    /* an enqueue */
 304         void                 *l_ast_data;
 305
 306         /* Server-side-only members */
 307
 308         /* protected by elt_lock */
 309         struct list_head      l_pending_chain;  /* callbacks pending */
 310         unsigned long         l_callback_timeout;
 311
 312         __u32                 l_pid;            /* pid which created this lock */
 313         __u32                 l_pidb;           /* who holds LOCK_PROTECT_BIT */
 314
 315         struct list_head      l_tmp;
 316
 317         /* for ldlm_add_ast_work_item() */
 318         struct list_head      l_bl_ast;
 319         struct list_head      l_cp_ast;
 320         struct ldlm_lock     *l_blocking_lock;
 321         int                   l_bl_ast_run;
 322 };
 323
 324 #define LDLM_PLAIN       10
 325 #define LDLM_EXTENT      11
 326 #define LDLM_FLOCK       12
 327 #define LDLM_IBITS       13
 328
 329 #define LDLM_MIN_TYPE 10
 330 #define LDLM_MAX_TYPE 14
 331
 332 struct ldlm_resource {
 333         struct ldlm_namespace *lr_namespace;
 334
 335         /* protected by ns_hash_lock */
 336         struct list_head       lr_hash;
 337         struct ldlm_resource  *lr_parent;   /* 0 for a root resource */
 338         struct list_head       lr_children; /* list head for child resources */
 339         struct list_head       lr_childof;  /* part of ns_root_list if root res,
 340                                              * part of lr_children if child */
 341         spinlock_t             lr_lock;
 342
 343         /* protected by lr_lock */
 344         struct list_head       lr_granted;
 345         struct list_head       lr_converting;
 346         struct list_head       lr_waiting;
 347         ldlm_mode_t            lr_most_restr;
 348         __u32                  lr_type; /* LDLM_PLAIN or LDLM_EXTENT */
 349         struct ldlm_res_id     lr_name;
 350         atomic_t               lr_refcount;
 351
 352         /* Server-side-only lock value block elements */
 353         struct semaphore       lr_lvb_sem;
 354         __u32                  lr_lvb_len;
 355         void                  *lr_lvb_data;
 356
 357         /* lr_tmp holds a list head temporarily, during the building of a work
 358          * queue.  see ldlm_add_ast_work_item and ldlm_run_ast_work */
 359         void                  *lr_tmp;
 360 };
 361
 362 struct ldlm_ast_work {
 363         struct ldlm_lock *w_lock;
 364         int               w_blocking;
 365         struct ldlm_lock_desc w_desc;
 366         struct list_head   w_list;
 367         int w_flags;
 368         void *w_data;
 369         int w_datalen;
 370 };
 371
 372 extern struct obd_ops ldlm_obd_ops;
 373
 374 extern char *ldlm_lockname[];
 375 extern char *ldlm_typename[];
 376 extern char *ldlm_it2str(int it);
 377
 378 #define __LDLM_DEBUG(level, lock, format, a...)                               \
 379 do {                                                                          \
 380         if (lock->l_resource == NULL) {                                       \
 381                 CDEBUG(level, "### " format                                   \
 382                        " ns: \?\? lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "\
 383                        "res: \?\? rrc=\?\? type: \?\?\? flags: %x remote: "   \
 384                        LPX64" expref: %d pid: %u\n" , ## a, lock,             \
 385                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),   \
 386                        lock->l_readers, lock->l_writers,                      \
 387                        ldlm_lockname[lock->l_granted_mode],                   \
 388                        ldlm_lockname[lock->l_req_mode],                       \
 389                        lock->l_flags, lock->l_remote_handle.cookie,           \
 390                        lock->l_export ?                                       \
 391                        atomic_read(&lock->l_export->exp_refcount) : -99,      \
 392                        lock->l_pid);                                          \
 393                 break;                                                        \
 394         }                                                                     \
 395         if (lock->l_resource->lr_type == LDLM_EXTENT) {                       \
 396                 CDEBUG(level, "### " format                                   \
 397                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "  \
 398                        "res: "LPU64"/"LPU64"/"LPU64" rrc: %d type: %s ["LPU64 \
 399                        "->"LPU64"] (req "LPU64"->"LPU64") flags: %x remote: " \
 400                        LPX64" expref: %d pid: %u\n" , ## a,                   \
 401                        lock->l_resource->lr_namespace->ns_name, lock,         \
 402                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),   \
 403                        lock->l_readers, lock->l_writers,                      \
 404                        ldlm_lockname[lock->l_granted_mode],                   \
 405                        ldlm_lockname[lock->l_req_mode],                       \
 406                        lock->l_resource->lr_name.name[0],                     \
 407                        lock->l_resource->lr_name.name[1],                     \
 408                        lock->l_resource->lr_name.name[2],                     \
 409                        atomic_read(&lock->l_resource->lr_refcount),           \
 410                        ldlm_typename[lock->l_resource->lr_type],              \
 411                        lock->l_policy_data.l_extent.start,                    \
 412                        lock->l_policy_data.l_extent.end,                      \
 413                        lock->l_req_extent.start, lock->l_req_extent.end,      \
 414                        lock->l_flags, lock->l_remote_handle.cookie,           \
 415                        lock->l_export ?                                       \
 416                        atomic_read(&lock->l_export->exp_refcount) : -99,      \
 417                        lock->l_pid);                                          \
 418                 break;                                                        \
 419         }                                                                     \
 420         if (lock->l_resource->lr_type == LDLM_FLOCK) {                        \
 421                 CDEBUG(level, "### " format                                   \
 422                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "  \
 423                        "res: "LPU64"/"LPU64"/"LPU64" rrc: %d type: %s pid: "  \
 424                        LPU64" " "["LPU64"->"LPU64"] flags: %x remote: "LPX64  \
 425                        " expref: %d pid: %u\n" , ## a,                        \
 426                        lock->l_resource->lr_namespace->ns_name, lock,         \
 427                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),   \
 428                        lock->l_readers, lock->l_writers,                      \
 429                        ldlm_lockname[lock->l_granted_mode],                   \
 430                        ldlm_lockname[lock->l_req_mode],                       \
 431                        lock->l_resource->lr_name.name[0],                     \
 432                        lock->l_resource->lr_name.name[1],                     \
 433                        lock->l_resource->lr_name.name[2],                     \
 434                        atomic_read(&lock->l_resource->lr_refcount),           \
 435                        ldlm_typename[lock->l_resource->lr_type],              \
 436                        lock->l_policy_data.l_flock.pid,                       \
 437                        lock->l_policy_data.l_flock.start,                     \
 438                        lock->l_policy_data.l_flock.end,                       \
 439                        lock->l_flags, lock->l_remote_handle.cookie,           \
 440                        lock->l_export ?                                       \
 441                        atomic_read(&lock->l_export->exp_refcount) : -99,      \
 442                        lock->l_pid);                                          \
 443                 break;                                                        \
 444         }                                                                     \
 445         if (lock->l_resource->lr_type == LDLM_IBITS) {                        \
 446                 CDEBUG(level, "### " format                                   \
 447                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "  \
 448                        "res: "LPU64"/"LPU64"/"LPU64" bits "LPX64" rrc: %d "   \
 449                        "type: %s flags: %x remote: "LPX64" expref: %d "       \
 450                        "pid %u\n" , ## a,                                     \
 451                        lock->l_resource->lr_namespace->ns_name,               \
 452                        lock, lock->l_handle.h_cookie,                         \
 453                        atomic_read (&lock->l_refc),                           \
 454                        lock->l_readers, lock->l_writers,                      \
 455                        ldlm_lockname[lock->l_granted_mode],                   \
 456                        ldlm_lockname[lock->l_req_mode],                       \
 457                        lock->l_resource->lr_name.name[0],                     \
 458                        lock->l_resource->lr_name.name[1],                     \
 459                        lock->l_resource->lr_name.name[2],                     \
 460                        lock->l_policy_data.l_inodebits.bits,                  \
 461                        atomic_read(&lock->l_resource->lr_refcount),           \
 462                        ldlm_typename[lock->l_resource->lr_type],              \
 463                        lock->l_flags, lock->l_remote_handle.cookie,           \
 464                        lock->l_export ?                                       \
 465                        atomic_read(&lock->l_export->exp_refcount) : -99,      \
 466                        lock->l_pid);                                          \
 467                 break;                                                        \
 468         }                                                                     \
 469         {                                                                     \
 470                 CDEBUG(level, "### " format                                   \
 471                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "  \
 472                        "res: "LPU64"/"LPU64"/"LPU64"/"LPU64" rrc: %d type: %s " \
 473                        "flags: %x remote: "LPX64" expref: %d "                \
 474                        "pid: %u\n" , ## a,                                    \
 475                        lock->l_resource->lr_namespace->ns_name,               \
 476                        lock, lock->l_handle.h_cookie,                         \
 477                        atomic_read (&lock->l_refc),                           \
 478                        lock->l_readers, lock->l_writers,                      \
 479                        ldlm_lockname[lock->l_granted_mode],                   \
 480                        ldlm_lockname[lock->l_req_mode],                       \
 481                        lock->l_resource->lr_name.name[0],                     \
 482                        lock->l_resource->lr_name.name[1],                     \
 483                        lock->l_resource->lr_name.name[2],                     \
 484                        lock->l_resource->lr_name.name[3],                     \
 485                        atomic_read(&lock->l_resource->lr_refcount),           \
 486                        ldlm_typename[lock->l_resource->lr_type],              \
 487                        lock->l_flags, lock->l_remote_handle.cookie,           \
 488                        lock->l_export ?                                       \
 489                        atomic_read(&lock->l_export->exp_refcount) : -99,      \
 490                        lock->l_pid);                                          \
 491         }                                                                     \
 492 } while (0)
 493
 494 #define LDLM_DEBUG(lock, format, a...) __LDLM_DEBUG(D_DLMTRACE, lock, \
 495                                                     format, ## a)
 496 #define LDLM_ERROR(lock, format, a...) __LDLM_DEBUG(D_ERROR, lock, format, ## a)
 497
 498 #define LDLM_DEBUG_NOLOCK(format, a...)                 \
 499         CDEBUG(D_DLMTRACE, "### " format "\n" , ## a)
 500
 501 typedef int (*ldlm_processing_policy)(struct ldlm_lock *lock, int *flags,
 502                                       int first_enq, ldlm_error_t *err,
 503                                       struct list_head *work_list);
 504
 505 /*
 506  * Iterators.
 507  */
 508
 509 #define LDLM_ITER_CONTINUE 1 /* keep iterating */
 510 #define LDLM_ITER_STOP     2 /* stop iterating */
 511
 512 typedef int (*ldlm_iterator_t)(struct ldlm_lock *, void *);
 513 typedef int (*ldlm_res_iterator_t)(struct ldlm_resource *, void *);
 514
 515 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
 516                           void *closure);
 517 int ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
 518                            void *closure);
 519 int ldlm_namespace_foreach_res(struct ldlm_namespace *ns,
 520                                ldlm_res_iterator_t iter, void *closure);
 521
 522 int ldlm_replay_locks(struct obd_import *imp);
 523 void ldlm_change_cbdata(struct ldlm_namespace *, struct ldlm_res_id *,
 524                         ldlm_iterator_t iter, void *data);
 525
 526 /* ldlm_flock.c */
 527 int ldlm_flock_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 528
 529 /* ldlm_extent.c */
 530 __u64 ldlm_extent_shift_kms(struct ldlm_lock *lock, __u64 old_kms);
 531
 532
 533 /* ldlm_lockd.c */
 534 int ldlm_server_blocking_ast(struct ldlm_lock *, struct ldlm_lock_desc *,
 535                              void *data, int flag);
 536 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 537 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data);
 538 int ldlm_handle_enqueue(struct ptlrpc_request *req, ldlm_completion_callback,
 539                         ldlm_blocking_callback, ldlm_glimpse_callback);
 540 int ldlm_handle_convert(struct ptlrpc_request *req);
 541 int ldlm_handle_cancel(struct ptlrpc_request *req);
 542 int ldlm_del_waiting_lock(struct ldlm_lock *lock);
 543 int ldlm_get_ref(void);
 544 void ldlm_put_ref(int force);
 545
 546 /* ldlm_lock.c */
 547 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res);
 548 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg);
 549 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh);
 550 struct ldlm_lock *__ldlm_handle2lock(struct lustre_handle *, int flags);
 551 void ldlm_cancel_callback(struct ldlm_lock *);
 552 int ldlm_lock_set_data(struct lustre_handle *, void *data);
 553 void ldlm_lock_remove_from_lru(struct ldlm_lock *);
 554 struct ldlm_lock *ldlm_handle2lock_ns(struct ldlm_namespace *,
 555                                       struct lustre_handle *);
 556
 557 static inline struct ldlm_lock *ldlm_handle2lock(struct lustre_handle *h)
 558 {
 559         return __ldlm_handle2lock(h, 0);
 560 }
 561
 562 #define LDLM_LOCK_PUT(lock)                     \
 563 do {                                            \
 564         /*LDLM_DEBUG((lock), "put");*/          \
 565         ldlm_lock_put(lock);                    \
 566 } while (0)
 567
 568 #define LDLM_LOCK_GET(lock)                     \
 569 ({                                              \
 570         ldlm_lock_get(lock);                    \
 571         /*LDLM_DEBUG((lock), "get");*/          \
 572         lock;                                   \
 573 })
 574
 575 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
 576 void ldlm_lock_put(struct ldlm_lock *lock);
 577 void ldlm_lock_destroy(struct ldlm_lock *lock);
 578 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
 579 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode);
 580 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode);
 581 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode);
 582 void ldlm_lock_allow_match(struct ldlm_lock *lock);
 583 int ldlm_lock_match(struct ldlm_namespace *ns, int flags, struct ldlm_res_id *,
 584                     __u32 type, ldlm_policy_data_t *, ldlm_mode_t mode,
 585                     struct lustre_handle *);
 586 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
 587                                         int *flags);
 588 void ldlm_lock_cancel(struct ldlm_lock *lock);
 589 void ldlm_cancel_locks_for_export(struct obd_export *export);
 590 void ldlm_reprocess_all(struct ldlm_resource *res);
 591 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns);
 592 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos);
 593 void ldlm_lock_dump_handle(int level, struct lustre_handle *);
 594
 595 /* ldlm_test.c */
 596 int ldlm_test(struct obd_device *device, struct lustre_handle *connh);
 597 int ldlm_regression_start(struct obd_device *obddev,
 598                           struct lustre_handle *connh,
 599                           unsigned int threads, unsigned int max_locks_in,
 600                           unsigned int num_resources_in,
 601                           unsigned int num_extents_in);
 602 int ldlm_regression_stop(void);
 603
 604
 605 /* resource.c */
 606 struct ldlm_namespace *ldlm_namespace_new(char *name, __u32 local);
 607 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, int flags);
 608 int ldlm_namespace_free(struct ldlm_namespace *ns, int force);
 609 int ldlm_proc_setup(void);
 610 void ldlm_proc_cleanup(void);
 611
 612 /* resource.c - internal */
 613 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
 614                                         struct ldlm_resource *parent,
 615                                         struct ldlm_res_id, __u32 type,
 616                                         int create);
 617 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
 618 int ldlm_resource_putref(struct ldlm_resource *res);
 619 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
 620                             struct ldlm_lock *lock);
 621 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
 622 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
 623 void ldlm_dump_all_namespaces(int level);
 624 void ldlm_namespace_dump(int level, struct ldlm_namespace *);
 625 void ldlm_resource_dump(int level, struct ldlm_resource *);
 626 int ldlm_lock_change_resource(struct ldlm_namespace *, struct ldlm_lock *,
 627                               struct ldlm_res_id);
 628
 629 /* ldlm_request.c */
 630 int ldlm_expired_completion_wait(void *data);
 631 int ldlm_completion_ast(struct ldlm_lock *lock, int flags, void *data);
 632 int ldlm_cli_enqueue(struct obd_export *exp,
 633                      struct ptlrpc_request *req,
 634                      struct ldlm_namespace *ns,
 635                      struct ldlm_res_id,
 636                      __u32 type,
 637                      ldlm_policy_data_t *,
 638                      ldlm_mode_t mode,
 639                      int *flags,
 640                      ldlm_blocking_callback blocking,
 641                      ldlm_completion_callback completion,
 642                      ldlm_glimpse_callback glimpse,
 643                      void *data,
 644                      void *lvb,
 645                      __u32 lvb_len,
 646                      void *lvb_swabber,
 647                      struct lustre_handle *lockh);
 648 int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new,
 649                     void *data, __u32 data_len);
 650 int ldlm_cli_convert(struct lustre_handle *, int new_mode, int *flags);
 651 int ldlm_cli_cancel(struct lustre_handle *lockh);
 652 int ldlm_cli_cancel_unused(struct ldlm_namespace *, struct ldlm_res_id *,
 653                            int flags, void *opaque);
 654
 655 /* mds/handler.c */
 656 /* This has to be here because recursive inclusion sucks. */
 657 int intent_disposition(struct ldlm_reply *rep, int flag);
 658 void intent_set_disposition(struct ldlm_reply *rep, int flag);
 659 int mds_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 660                      void *data, int flag);
 661
 662
 663 /* ioctls for trying requests */
 664 #define IOC_LDLM_TYPE                   'f'
 665 #define IOC_LDLM_MIN_NR                 40
 666
 667 #define IOC_LDLM_TEST                   _IOWR('f', 40, long)
 668 #define IOC_LDLM_DUMP                   _IOWR('f', 41, long)
 669 #define IOC_LDLM_REGRESS_START          _IOWR('f', 42, long)
 670 #define IOC_LDLM_REGRESS_STOP           _IOWR('f', 43, long)
 671 #define IOC_LDLM_MAX_NR                 43
 672
 673 static inline void lock_res(struct ldlm_resource *res)
 674 {
 675         spin_lock(&res->lr_lock);
 676 }
 677
 678 static inline void unlock_res(struct ldlm_resource *res)
 679 {
 680         spin_unlock(&res->lr_lock);
 681 }
 682
 683 static inline void check_res_locked(struct ldlm_resource *res)
 684 {
 685         LASSERT_SPIN_LOCKED(&res->lr_lock);
 686 }
 687
 688 struct ldlm_resource * lock_res_and_lock(struct ldlm_lock *lock);
 689 void unlock_res_and_lock(struct ldlm_lock *lock);
 690
 691 #endif