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27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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33 * This file is part of Lustre, http://www.lustre.org/
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37 /** \defgroup LDLM Lustre Distributed Lock Manager
39 * Lustre DLM is based on VAX DLM.
40 * Its two main roles are:
41 * - To provide locking assuring consistency of data on all Lustre nodes.
42 * - To allow clients to cache state protected by a lock by holding the
43 * lock until a conflicting lock is requested or it is expired by the LRU.
48 #ifndef _LUSTRE_DLM_H__
49 #define _LUSTRE_DLM_H__
51 #include <lustre_lib.h>
52 #include <lustre_net.h>
53 #include <lustre_import.h>
54 #include <lustre_handles.h>
55 #include <interval_tree.h> /* for interval_node{}, ldlm_extent */
58 #include "lustre_dlm_flags.h"
63 #define OBD_LDLM_DEVICENAME "ldlm"
65 #define LDLM_DEFAULT_LRU_SIZE (100 * num_online_cpus())
66 #define LDLM_DEFAULT_MAX_ALIVE (cfs_time_seconds(36000))
67 #define LDLM_CTIME_AGE_LIMIT (10)
68 #define LDLM_DEFAULT_PARALLEL_AST_LIMIT 1024
71 * LDLM non-error return states
76 ELDLM_LOCK_CHANGED = 300,
77 ELDLM_LOCK_ABORTED = 301,
78 ELDLM_LOCK_REPLACED = 302,
79 ELDLM_NO_LOCK_DATA = 303,
80 ELDLM_LOCK_WOULDBLOCK = 304,
82 ELDLM_NAMESPACE_EXISTS = 400,
83 ELDLM_BAD_NAMESPACE = 401
87 * LDLM namespace type.
88 * The "client" type is actually an indication that this is a narrow local view
89 * into complete namespace on the server. Such namespaces cannot make any
90 * decisions about lack of conflicts or do any autonomous lock granting without
91 * first speaking to a server.
94 LDLM_NAMESPACE_SERVER = 1 << 0,
95 LDLM_NAMESPACE_CLIENT = 1 << 1
99 * The blocking callback is overloaded to perform two functions. These flags
100 * indicate which operation should be performed.
102 #define LDLM_CB_BLOCKING 1
103 #define LDLM_CB_CANCELING 2
106 * \name Lock Compatibility Matrix.
108 * A lock has both a type (extent, flock, inode bits, or plain) and a mode.
109 * Lock types are described in their respective implementation files:
110 * ldlm_{extent,flock,inodebits,plain}.c.
112 * There are six lock modes along with a compatibility matrix to indicate if
113 * two locks are compatible.
115 * - EX: Exclusive mode. Before a new file is created, MDS requests EX lock
117 * - PW: Protective Write (normal write) mode. When a client requests a write
118 * lock from an OST, a lock with PW mode will be issued.
119 * - PR: Protective Read (normal read) mode. When a client requests a read from
120 * an OST, a lock with PR mode will be issued. Also, if the client opens a
121 * file for execution, it is granted a lock with PR mode.
122 * - CW: Concurrent Write mode. The type of lock that the MDS grants if a client
123 * requests a write lock during a file open operation.
124 * - CR Concurrent Read mode. When a client performs a path lookup, MDS grants
125 * an inodebit lock with the CR mode on the intermediate path component.
139 #define LCK_COMPAT_EX LCK_NL
140 #define LCK_COMPAT_PW (LCK_COMPAT_EX | LCK_CR)
141 #define LCK_COMPAT_PR (LCK_COMPAT_PW | LCK_PR)
142 #define LCK_COMPAT_CW (LCK_COMPAT_PW | LCK_CW)
143 #define LCK_COMPAT_CR (LCK_COMPAT_CW | LCK_PR | LCK_PW)
144 #define LCK_COMPAT_NL (LCK_COMPAT_CR | LCK_EX | LCK_GROUP)
145 #define LCK_COMPAT_GROUP (LCK_GROUP | LCK_NL)
146 #define LCK_COMPAT_COS (LCK_COS)
147 /** @} Lock Compatibility Matrix */
149 extern ldlm_mode_t lck_compat_array[];
151 static inline void lockmode_verify(ldlm_mode_t mode)
153 LASSERT(mode > LCK_MINMODE && mode < LCK_MAXMODE);
156 static inline int lockmode_compat(ldlm_mode_t exist_mode, ldlm_mode_t new_mode)
158 return (lck_compat_array[exist_mode] & new_mode);
163 * cluster name spaces
167 #define DLM_OST_NAMESPACE 1
168 #define DLM_MDS_NAMESPACE 2
171 - do we just separate this by security domains and use a prefix for
172 multiple namespaces in the same domain?
177 * Locking rules for LDLM:
182 * waiting_locks_spinlock
197 struct ldlm_resource;
198 struct ldlm_namespace;
201 * Operations on LDLM pools.
202 * LDLM pool is a pool of locks in the namespace without any implicitly
204 * Locks in the pool are organized in LRU.
205 * Local memory pressure or server instructions (e.g. mempressure on server)
206 * can trigger freeing of locks from the pool
208 struct ldlm_pool_ops {
209 /** Recalculate pool \a pl usage */
210 int (*po_recalc)(struct ldlm_pool *pl);
211 /** Cancel at least \a nr locks from pool \a pl */
212 int (*po_shrink)(struct ldlm_pool *pl, int nr, gfp_t gfp_mask);
213 int (*po_setup)(struct ldlm_pool *pl, int limit);
216 /** One second for pools thread check interval. Each pool has own period. */
217 #define LDLM_POOLS_THREAD_PERIOD (1)
219 /** ~6% margin for modest pools. See ldlm_pool.c for details. */
220 #define LDLM_POOLS_MODEST_MARGIN_SHIFT (4)
222 /** Default recalc period for server side pools in sec. */
223 #define LDLM_POOL_SRV_DEF_RECALC_PERIOD (1)
225 /** Default recalc period for client side pools in sec. */
226 #define LDLM_POOL_CLI_DEF_RECALC_PERIOD (10)
229 * LDLM pool structure to track granted locks.
230 * For purposes of determining when to release locks on e.g. memory pressure.
231 * This feature is commonly referred to as lru_resize.
234 /** Pool proc directory. */
235 struct proc_dir_entry *pl_proc_dir;
236 /** Pool name, must be long enough to hold compound proc entry name. */
238 /** Lock for protecting SLV/CLV updates. */
240 /** Number of allowed locks in in pool, both, client and server side. */
242 /** Number of granted locks in */
244 /** Grant rate per T. */
245 atomic_t pl_grant_rate;
246 /** Cancel rate per T. */
247 atomic_t pl_cancel_rate;
248 /** Server lock volume (SLV). Protected by pl_lock. */
249 __u64 pl_server_lock_volume;
250 /** Current biggest client lock volume. Protected by pl_lock. */
251 __u64 pl_client_lock_volume;
252 /** Lock volume factor. SLV on client is calculated as following:
253 * server_slv * lock_volume_factor. */
254 atomic_t pl_lock_volume_factor;
255 /** Time when last SLV from server was obtained. */
256 time_t pl_recalc_time;
257 /** Recalculation period for pool. */
258 time_t pl_recalc_period;
259 /** Recalculation and shrink operations. */
260 struct ldlm_pool_ops *pl_ops;
261 /** Number of planned locks for next period. */
263 /** Pool statistics. */
264 struct lprocfs_stats *pl_stats;
267 typedef int (*ldlm_res_policy)(struct ldlm_namespace *, struct ldlm_lock **,
268 void *req_cookie, ldlm_mode_t mode, __u64 flags,
271 typedef int (*ldlm_cancel_cbt)(struct ldlm_lock *lock);
275 * LVB is Lock Value Block. This is a special opaque (to LDLM) value that could
276 * be associated with an LDLM lock and transferred from client to server and
279 * Currently LVBs are used by:
280 * - OSC-OST code to maintain current object size/times
281 * - layout lock code to return the layout when the layout lock is granted
283 * To ensure delayed LVB initialization, it is highly recommended to use the set
284 * of ldlm_[res_]lvbo_[init,update,fill]() functions.
286 struct ldlm_valblock_ops {
287 int (*lvbo_init)(struct ldlm_resource *res);
288 int (*lvbo_update)(struct ldlm_resource *res,
289 struct ptlrpc_request *r,
291 int (*lvbo_free)(struct ldlm_resource *res);
292 /* Return size of lvb data appropriate RPC size can be reserved */
293 int (*lvbo_size)(struct ldlm_lock *lock);
294 /* Called to fill in lvb data to RPC buffer @buf */
295 int (*lvbo_fill)(struct ldlm_lock *lock, void *buf, int buflen);
299 * LDLM pools related, type of lock pool in the namespace.
300 * Greedy means release cached locks aggressively
303 LDLM_NAMESPACE_GREEDY = 1 << 0,
304 LDLM_NAMESPACE_MODEST = 1 << 1
308 * Default values for the "max_nolock_size", "contention_time" and
309 * "contended_locks" namespace tunables.
311 #define NS_DEFAULT_MAX_NOLOCK_BYTES 0
312 #define NS_DEFAULT_CONTENTION_SECONDS 2
313 #define NS_DEFAULT_CONTENDED_LOCKS 32
315 struct ldlm_ns_bucket {
316 /** back pointer to namespace */
317 struct ldlm_namespace *nsb_namespace;
319 * Estimated lock callback time. Used by adaptive timeout code to
320 * avoid spurious client evictions due to unresponsiveness when in
321 * fact the network or overall system load is at fault
323 struct adaptive_timeout nsb_at_estimate;
327 /** LDLM namespace lock stats */
334 LDLM_NS_TYPE_UNKNOWN = 0,
352 * Namespace serves to contain locks related to a particular service.
353 * There are two kinds of namespaces:
354 * - Server namespace has knowledge of all locks and is therefore authoritative
355 * to make decisions like what locks could be granted and what conflicts
356 * exist during new lock enqueue.
357 * - Client namespace only has limited knowledge about locks in the namespace,
358 * only seeing locks held by the client.
360 * Every Lustre service has one server namespace present on the server serving
361 * that service. Every client connected to the service has a client namespace
363 * Every lock obtained by client in that namespace is actually represented by
364 * two in-memory locks. One on the server and one on the client. The locks are
365 * linked by a special cookie by which one node can tell to the other which lock
366 * it actually means during communications. Such locks are called remote locks.
367 * The locks held by server only without any reference to a client are called
370 struct ldlm_namespace {
371 /** Backward link to OBD, required for LDLM pool to store new SLV. */
372 struct obd_device *ns_obd;
374 /** Flag indicating if namespace is on client instead of server */
375 ldlm_side_t ns_client;
377 /** Resource hash table for namespace. */
378 cfs_hash_t *ns_rs_hash;
383 /** big refcount (by bucket) */
387 * Namespace connect flags supported by server (may be changed via
388 * /proc, LRU resize may be disabled/enabled).
390 __u64 ns_connect_flags;
392 /** Client side original connect flags supported by server. */
393 __u64 ns_orig_connect_flags;
395 /* namespace proc dir entry */
396 struct proc_dir_entry *ns_proc_dir_entry;
399 * Position in global namespace list linking all namespaces on
402 struct list_head ns_list_chain;
405 * List of unused locks for this namespace. This list is also called
407 * Unused locks are locks with zero reader/writer reference counts.
408 * This list is only used on clients for lock caching purposes.
409 * When we want to release some locks voluntarily or if server wants
410 * us to release some locks due to e.g. memory pressure, we take locks
411 * to release from the head of this list.
412 * Locks are linked via l_lru field in \see struct ldlm_lock.
414 struct list_head ns_unused_list;
415 /** Number of locks in the LRU list above */
419 * Maximum number of locks permitted in the LRU. If 0, means locks
420 * are managed by pools and there is no preset limit, rather it is all
421 * controlled by available memory on this client and on server.
423 unsigned int ns_max_unused;
424 /** Maximum allowed age (last used time) for locks in the LRU */
425 unsigned int ns_max_age;
427 * Server only: number of times we evicted clients due to lack of reply
430 unsigned int ns_timeouts;
432 * Number of seconds since the file change time after which the
433 * MDT will return an UPDATE lock along with a LOOKUP lock.
434 * This allows the client to start caching negative dentries
435 * for a directory and may save an RPC for a later stat.
437 unsigned int ns_ctime_age_limit;
440 * Used to rate-limit ldlm_namespace_dump calls.
441 * \see ldlm_namespace_dump. Increased by 10 seconds every time
444 cfs_time_t ns_next_dump;
446 /** "policy" function that does actual lock conflict determination */
447 ldlm_res_policy ns_policy;
450 * LVB operations for this namespace.
451 * \see struct ldlm_valblock_ops
453 struct ldlm_valblock_ops *ns_lvbo;
456 * Used by filter code to store pointer to OBD of the service.
457 * Should be dropped in favor of \a ns_obd
462 * Wait queue used by __ldlm_namespace_free. Gets woken up every time
463 * a resource is removed.
465 wait_queue_head_t ns_waitq;
466 /** LDLM pool structure for this namespace */
467 struct ldlm_pool ns_pool;
468 /** Definition of how eagerly unused locks will be released from LRU */
469 ldlm_appetite_t ns_appetite;
472 * If more than \a ns_contended_locks are found, the resource is
473 * considered to be contended. Lock enqueues might specify that no
474 * contended locks should be granted
476 unsigned ns_contended_locks;
479 * The resources in this namespace remember contended state during
480 * \a ns_contention_time, in seconds.
482 unsigned ns_contention_time;
485 * Limit size of contended extent locks, in bytes.
486 * If extended lock is requested for more then this many bytes and
487 * caller instructs us not to grant contended locks, we would disregard
490 unsigned ns_max_nolock_size;
492 /** Limit of parallel AST RPC count. */
493 unsigned ns_max_parallel_ast;
496 * Callback to check if a lock is good to be canceled by ELC or
499 ldlm_cancel_cbt ns_cancel;
501 /** LDLM lock stats */
502 struct lprocfs_stats *ns_stats;
505 * Flag to indicate namespace is being freed. Used to determine if
506 * recalculation of LDLM pool statistics should be skipped.
508 unsigned ns_stopping:1;
512 * Returns 1 if namespace \a ns is a client namespace.
514 static inline int ns_is_client(struct ldlm_namespace *ns)
517 LASSERT(!(ns->ns_client & ~(LDLM_NAMESPACE_CLIENT |
518 LDLM_NAMESPACE_SERVER)));
519 LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT ||
520 ns->ns_client == LDLM_NAMESPACE_SERVER);
521 return ns->ns_client == LDLM_NAMESPACE_CLIENT;
525 * Returns 1 if namespace \a ns is a server namespace.
527 static inline int ns_is_server(struct ldlm_namespace *ns)
530 LASSERT(!(ns->ns_client & ~(LDLM_NAMESPACE_CLIENT |
531 LDLM_NAMESPACE_SERVER)));
532 LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT ||
533 ns->ns_client == LDLM_NAMESPACE_SERVER);
534 return ns->ns_client == LDLM_NAMESPACE_SERVER;
538 * Returns 1 if namespace \a ns supports early lock cancel (ELC).
540 static inline int ns_connect_cancelset(struct ldlm_namespace *ns)
543 return !!(ns->ns_connect_flags & OBD_CONNECT_CANCELSET);
547 * Returns 1 if this namespace supports lru_resize.
549 static inline int ns_connect_lru_resize(struct ldlm_namespace *ns)
552 return !!(ns->ns_connect_flags & OBD_CONNECT_LRU_RESIZE);
555 static inline void ns_register_cancel(struct ldlm_namespace *ns,
564 /** Type for blocking callback function of a lock. */
565 typedef int (*ldlm_blocking_callback)(struct ldlm_lock *lock,
566 struct ldlm_lock_desc *new, void *data,
568 /** Type for completion callback function of a lock. */
569 typedef int (*ldlm_completion_callback)(struct ldlm_lock *lock, __u64 flags,
571 /** Type for glimpse callback function of a lock. */
572 typedef int (*ldlm_glimpse_callback)(struct ldlm_lock *lock, void *data);
574 /** Work list for sending GL ASTs to multiple locks. */
575 struct ldlm_glimpse_work {
576 struct ldlm_lock *gl_lock; /* lock to glimpse */
577 struct list_head gl_list; /* linkage to other gl work structs */
578 __u32 gl_flags;/* see LDLM_GL_WORK_* below */
579 union ldlm_gl_desc *gl_desc; /* glimpse descriptor to be packed in
580 * glimpse callback request */
583 /** The ldlm_glimpse_work is allocated on the stack and should not be freed. */
584 #define LDLM_GL_WORK_NOFREE 0x1
586 /** Interval node data for each LDLM_EXTENT lock. */
587 struct ldlm_interval {
588 struct interval_node li_node; /* node for tree management */
589 struct list_head li_group; /* the locks which have the same
590 * policy - group of the policy */
592 #define to_ldlm_interval(n) container_of(n, struct ldlm_interval, li_node)
595 * Interval tree for extent locks.
596 * The interval tree must be accessed under the resource lock.
597 * Interval trees are used for granted extent locks to speed up conflicts
598 * lookup. See ldlm/interval_tree.c for more details.
600 struct ldlm_interval_tree {
603 ldlm_mode_t lit_mode; /* lock mode */
604 struct interval_node *lit_root; /* actual ldlm_interval */
607 /** Whether to track references to exports by LDLM locks. */
608 #define LUSTRE_TRACKS_LOCK_EXP_REFS (0)
612 LCF_ASYNC = 0x1, /* Cancel locks asynchronously. */
613 LCF_LOCAL = 0x2, /* Cancel locks locally, not notifing server */
614 LCF_BL_AST = 0x4, /* Cancel locks marked as LDLM_FL_BL_AST
616 } ldlm_cancel_flags_t;
622 __u64 blocking_owner;
623 struct obd_export *blocking_export;
624 /* Protected by the hash lock */
629 union ldlm_policy_data {
630 struct ldlm_extent l_extent;
631 struct ldlm_flock l_flock;
632 struct ldlm_inodebits l_inodebits;
635 typedef union ldlm_policy_data ldlm_policy_data_t;
637 void ldlm_convert_policy_to_wire(ldlm_type_t type,
638 const ldlm_policy_data_t *lpolicy,
639 ldlm_wire_policy_data_t *wpolicy);
640 void ldlm_convert_policy_to_local(struct obd_export *exp, ldlm_type_t type,
641 const ldlm_wire_policy_data_t *wpolicy,
642 ldlm_policy_data_t *lpolicy);
652 * LDLM lock structure
654 * Represents a single LDLM lock and its state in memory. Each lock is
655 * associated with a single ldlm_resource, the object which is being
656 * locked. There may be multiple ldlm_locks on a single resource,
657 * depending on the lock type and whether the locks are conflicting or
663 * When remote side wants to tell us about a lock, they address
664 * it by this opaque handle. The handle does not hold a
665 * reference on the ldlm_lock, so it can be safely passed to
666 * other threads or nodes. When the lock needs to be accessed
667 * from the handle, it is looked up again in the lock table, and
668 * may no longer exist.
670 * Must be first in the structure.
672 struct portals_handle l_handle;
674 * Lock reference count.
675 * This is how many users have pointers to actual structure, so that
676 * we do not accidentally free lock structure that is in use.
680 * Internal spinlock protects l_resource. We should hold this lock
681 * first before taking res_lock.
685 * Pointer to actual resource this lock is in.
686 * ldlm_lock_change_resource() can change this.
688 struct ldlm_resource *l_resource;
690 * List item for client side LRU list.
691 * Protected by ns_lock in struct ldlm_namespace.
693 struct list_head l_lru;
695 * Linkage to resource's lock queues according to current lock state.
696 * (could be granted, waiting or converting)
697 * Protected by lr_lock in struct ldlm_resource.
699 struct list_head l_res_link;
701 * Tree node for ldlm_extent.
703 struct ldlm_interval *l_tree_node;
705 * Per export hash of locks.
706 * Protected by per-bucket exp->exp_lock_hash locks.
708 struct hlist_node l_exp_hash;
710 * Per export hash of flock locks.
711 * Protected by per-bucket exp->exp_flock_hash locks.
713 struct hlist_node l_exp_flock_hash;
716 * Protected by lr_lock.
718 ldlm_mode_t l_req_mode;
720 * Granted mode, also protected by lr_lock.
722 ldlm_mode_t l_granted_mode;
723 /** Lock completion handler pointer. Called when lock is granted. */
724 ldlm_completion_callback l_completion_ast;
726 * Lock blocking AST handler pointer.
727 * It plays two roles:
728 * - as a notification of an attempt to queue a conflicting lock (once)
729 * - as a notification when the lock is being cancelled.
731 * As such it's typically called twice: once for the initial conflict
732 * and then once more when the last user went away and the lock is
733 * cancelled (could happen recursively).
735 ldlm_blocking_callback l_blocking_ast;
737 * Lock glimpse handler.
738 * Glimpse handler is used to obtain LVB updates from a client by
741 ldlm_glimpse_callback l_glimpse_ast;
745 * This is a pointer to actual client export for locks that were granted
746 * to clients. Used server-side.
748 struct obd_export *l_export;
750 * Lock connection export.
751 * Pointer to server export on a client.
753 struct obd_export *l_conn_export;
756 * Remote lock handle.
757 * If the lock is remote, this is the handle of the other side lock
760 struct lustre_handle l_remote_handle;
763 * Representation of private data specific for a lock type.
764 * Examples are: extent range for extent lock or bitmask for ibits locks
766 ldlm_policy_data_t l_policy_data;
769 * Lock state flags. Protected by lr_lock.
770 * \see lustre_dlm_flags.h where the bits are defined.
775 * Lock r/w usage counters.
776 * Protected by lr_lock.
781 * If the lock is granted, a process sleeps on this waitq to learn when
782 * it's no longer in use. If the lock is not granted, a process sleeps
783 * on this waitq to learn when it becomes granted.
785 wait_queue_head_t l_waitq;
788 * Seconds. It will be updated if there is any activity related to
789 * the lock, e.g. enqueue the lock or send blocking AST.
791 cfs_time_t l_last_activity;
794 * Time last used by e.g. being matched by lock match.
795 * Jiffies. Should be converted to time if needed.
797 cfs_time_t l_last_used;
799 /** Originally requested extent for the extent lock. */
800 struct ldlm_extent l_req_extent;
803 * Client-side-only members.
806 enum lvb_type l_lvb_type;
809 * Temporary storage for a LVB received during an enqueue operation.
814 /** Private storage for lock user. Opaque to LDLM. */
818 * Server-side-only members.
822 * Connection cookie for the client originating the operation.
823 * Used by Commit on Share (COS) code. Currently only used for
824 * inodebits locks on MDS.
826 __u64 l_client_cookie;
829 * List item for locks waiting for cancellation from clients.
830 * The lists this could be linked into are:
831 * waiting_locks_list (protected by waiting_locks_spinlock),
832 * then if the lock timed out, it is moved to
833 * expired_lock_thread.elt_expired_locks for further processing.
834 * Protected by elt_lock.
836 struct list_head l_pending_chain;
839 * Set when lock is sent a blocking AST. Time in seconds when timeout
840 * is reached and client holding this lock could be evicted.
841 * This timeout could be further extended by e.g. certain IO activity
843 * \see ost_rw_prolong_locks
845 cfs_time_t l_callback_timeout;
847 /** Local PID of process which created this lock. */
851 * Number of times blocking AST was sent for this lock.
852 * This is for debugging. Valid values are 0 and 1, if there is an
853 * attempt to send blocking AST more than once, an assertion would be
854 * hit. \see ldlm_work_bl_ast_lock
857 /** List item ldlm_add_ast_work_item() for case of blocking ASTs. */
858 struct list_head l_bl_ast;
859 /** List item ldlm_add_ast_work_item() for case of completion ASTs. */
860 struct list_head l_cp_ast;
861 /** For ldlm_add_ast_work_item() for "revoke" AST used in COS. */
862 struct list_head l_rk_ast;
865 * Pointer to a conflicting lock that caused blocking AST to be sent
868 struct ldlm_lock *l_blocking_lock;
871 * Protected by lr_lock, linkages to "skip lists".
872 * For more explanations of skip lists see ldlm/ldlm_inodebits.c
874 struct list_head l_sl_mode;
875 struct list_head l_sl_policy;
877 /** Reference tracking structure to debug leaked locks. */
878 struct lu_ref l_reference;
879 #if LUSTRE_TRACKS_LOCK_EXP_REFS
880 /* Debugging stuff for bug 20498, for tracking export references. */
881 /** number of export references taken */
883 /** link all locks referencing one export */
884 struct list_head l_exp_refs_link;
885 /** referenced export object */
886 struct obd_export *l_exp_refs_target;
889 * export blocking dlm lock list, protected by
890 * l_export->exp_bl_list_lock.
891 * Lock order of waiting_lists_spinlock, exp_bl_list_lock and res lock
892 * is: res lock -> exp_bl_list_lock -> wanting_lists_spinlock.
894 struct list_head l_exp_list;
898 * LDLM resource description.
899 * Basically, resource is a representation for a single object.
900 * Object has a name which is currently 4 64-bit integers. LDLM user is
901 * responsible for creation of a mapping between objects it wants to be
902 * protected and resource names.
904 * A resource can only hold locks of a single lock type, though there may be
905 * multiple ldlm_locks on a single resource, depending on the lock type and
906 * whether the locks are conflicting or not.
908 struct ldlm_resource {
909 struct ldlm_ns_bucket *lr_ns_bucket;
912 * List item for list in namespace hash.
913 * protected by ns_lock
915 struct hlist_node lr_hash;
917 /** Spinlock to protect locks under this resource. */
921 * protected by lr_lock
923 /** List of locks in granted state */
924 struct list_head lr_granted;
925 /** List of locks waiting to change their granted mode (converted) */
926 struct list_head lr_converting;
928 * List of locks that could not be granted due to conflicts and
929 * that are waiting for conflicts to go away */
930 struct list_head lr_waiting;
933 /* XXX No longer needed? Remove ASAP */
934 ldlm_mode_t lr_most_restr;
936 /** Type of locks this resource can hold. Only one type per resource. */
937 ldlm_type_t lr_type; /* LDLM_{PLAIN,EXTENT,FLOCK,IBITS} */
940 struct ldlm_res_id lr_name;
941 /** Reference count for this resource */
942 atomic_t lr_refcount;
945 * Interval trees (only for extent locks) for all modes of this resource
947 struct ldlm_interval_tree lr_itree[LCK_MODE_NUM];
950 * Server-side-only lock value block elements.
951 * To serialize lvbo_init.
953 struct mutex lr_lvb_mutex;
955 /** is lvb initialized ? */
956 bool lr_lvb_initialized;
957 /** protected by lr_lock */
960 /** When the resource was considered as contended. */
961 cfs_time_t lr_contention_time;
962 /** List of references to this resource. For debugging. */
963 struct lu_ref lr_reference;
965 struct inode *lr_lvb_inode;
968 static inline bool ldlm_has_layout(struct ldlm_lock *lock)
970 return lock->l_resource->lr_type == LDLM_IBITS &&
971 lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_LAYOUT;
975 ldlm_ns_name(struct ldlm_namespace *ns)
977 return ns->ns_rs_hash->hs_name;
980 static inline struct ldlm_namespace *
981 ldlm_res_to_ns(struct ldlm_resource *res)
983 return res->lr_ns_bucket->nsb_namespace;
986 static inline struct ldlm_namespace *
987 ldlm_lock_to_ns(struct ldlm_lock *lock)
989 return ldlm_res_to_ns(lock->l_resource);
993 ldlm_lock_to_ns_name(struct ldlm_lock *lock)
995 return ldlm_ns_name(ldlm_lock_to_ns(lock));
998 static inline struct adaptive_timeout *
999 ldlm_lock_to_ns_at(struct ldlm_lock *lock)
1001 return &lock->l_resource->lr_ns_bucket->nsb_at_estimate;
1004 static inline int ldlm_lvbo_init(struct ldlm_resource *res)
1006 struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1009 if (ns->ns_lvbo == NULL || ns->ns_lvbo->lvbo_init == NULL ||
1010 res->lr_lvb_initialized)
1013 mutex_lock(&res->lr_lvb_mutex);
1014 /* Did we lose the race? */
1015 if (res->lr_lvb_initialized) {
1016 mutex_unlock(&res->lr_lvb_mutex);
1019 rc = ns->ns_lvbo->lvbo_init(res);
1021 CDEBUG(D_DLMTRACE, "lvbo_init failed for resource : rc = %d\n",
1023 if (res->lr_lvb_data != NULL) {
1024 OBD_FREE(res->lr_lvb_data, res->lr_lvb_len);
1025 res->lr_lvb_data = NULL;
1027 res->lr_lvb_len = rc;
1029 res->lr_lvb_initialized = true;
1031 mutex_unlock(&res->lr_lvb_mutex);
1035 static inline int ldlm_lvbo_size(struct ldlm_lock *lock)
1037 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
1039 if (ns->ns_lvbo != NULL && ns->ns_lvbo->lvbo_size != NULL)
1040 return ns->ns_lvbo->lvbo_size(lock);
1045 static inline int ldlm_lvbo_fill(struct ldlm_lock *lock, void *buf, int len)
1047 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
1050 if (ns->ns_lvbo != NULL) {
1051 LASSERT(ns->ns_lvbo->lvbo_fill != NULL);
1052 /* init lvb now if not already */
1053 rc = ldlm_lvbo_init(lock->l_resource);
1055 CERROR("lock %p: delayed lvb init failed (rc %d)",
1059 return ns->ns_lvbo->lvbo_fill(lock, buf, len);
1064 struct ldlm_ast_work {
1065 struct ldlm_lock *w_lock;
1067 struct ldlm_lock_desc w_desc;
1068 struct list_head w_list;
1075 * Common ldlm_enqueue parameters
1077 struct ldlm_enqueue_info {
1078 __u32 ei_type; /** Type of the lock being enqueued. */
1079 __u32 ei_mode; /** Mode of the lock being enqueued. */
1080 void *ei_cb_bl; /** blocking lock callback */
1081 void *ei_cb_cp; /** lock completion callback */
1082 void *ei_cb_gl; /** lock glimpse callback */
1083 void *ei_cbdata; /** Data to be passed into callbacks. */
1084 unsigned int ei_enq_slave:1; /* whether enqueue slave stripes */
1087 #define ei_res_id ei_cb_gl
1089 extern struct obd_ops ldlm_obd_ops;
1091 extern char *ldlm_lockname[];
1092 extern char *ldlm_typename[];
1093 extern char *ldlm_it2str(int it);
1096 * Just a fancy CDEBUG call with log level preset to LDLM_DEBUG.
1097 * For the cases where we do not have actual lock to print along
1098 * with a debugging message that is ldlm-related
1100 #define LDLM_DEBUG_NOLOCK(format, a...) \
1101 CDEBUG(D_DLMTRACE, "### " format "\n" , ##a)
1104 * Support function for lock information printing into debug logs.
1108 #define ldlm_lock_debug(msgdata, mask, cdls, lock, fmt, a...) do { \
1109 CFS_CHECK_STACK(msgdata, mask, cdls); \
1111 if (((mask) & D_CANTMASK) != 0 || \
1112 ((libcfs_debug & (mask)) != 0 && \
1113 (libcfs_subsystem_debug & DEBUG_SUBSYSTEM) != 0)) \
1114 _ldlm_lock_debug(lock, msgdata, fmt, ##a); \
1117 void _ldlm_lock_debug(struct ldlm_lock *lock,
1118 struct libcfs_debug_msg_data *data,
1119 const char *fmt, ...)
1120 __attribute__ ((format (printf, 3, 4)));
1123 * Rate-limited version of lock printing function.
1125 #define LDLM_DEBUG_LIMIT(mask, lock, fmt, a...) do { \
1126 static cfs_debug_limit_state_t _ldlm_cdls; \
1127 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, mask, &_ldlm_cdls); \
1128 ldlm_lock_debug(&msgdata, mask, &_ldlm_cdls, lock, "### " fmt , ##a);\
1131 #define LDLM_ERROR(lock, fmt, a...) LDLM_DEBUG_LIMIT(D_ERROR, lock, fmt, ## a)
1132 #define LDLM_WARN(lock, fmt, a...) LDLM_DEBUG_LIMIT(D_WARNING, lock, fmt, ## a)
1134 /** Non-rate-limited lock printing function for debugging purposes. */
1135 #define LDLM_DEBUG(lock, fmt, a...) do { \
1136 if (likely(lock != NULL)) { \
1137 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_DLMTRACE, NULL); \
1138 ldlm_lock_debug(&msgdata, D_DLMTRACE, NULL, lock, \
1139 "### " fmt , ##a); \
1141 LDLM_DEBUG_NOLOCK("no dlm lock: " fmt, ##a); \
1144 #else /* !LIBCFS_DEBUG */
1145 # define LDLM_DEBUG_LIMIT(mask, lock, fmt, a...) ((void)0)
1146 # define LDLM_DEBUG(lock, fmt, a...) ((void)0)
1147 # define LDLM_ERROR(lock, fmt, a...) ((void)0)
1150 typedef int (*ldlm_processing_policy)(struct ldlm_lock *lock, __u64 *flags,
1151 int first_enq, ldlm_error_t *err,
1152 struct list_head *work_list);
1155 * Return values for lock iterators.
1156 * Also used during deciding of lock grants and cancellations.
1158 #define LDLM_ITER_CONTINUE 1 /* keep iterating */
1159 #define LDLM_ITER_STOP 2 /* stop iterating */
1161 typedef int (*ldlm_iterator_t)(struct ldlm_lock *, void *);
1162 typedef int (*ldlm_res_iterator_t)(struct ldlm_resource *, void *);
1164 /** \defgroup ldlm_iterator Lock iterators
1166 * LDLM provides for a way to iterate through every lock on a resource or
1167 * namespace or every resource in a namespace.
1169 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
1171 void ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
1173 int ldlm_resource_iterate(struct ldlm_namespace *, const struct ldlm_res_id *,
1174 ldlm_iterator_t iter, void *data);
1175 /** @} ldlm_iterator */
1177 int ldlm_replay_locks(struct obd_import *imp);
1180 int ldlm_flock_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data);
1183 __u64 ldlm_extent_shift_kms(struct ldlm_lock *lock, __u64 old_kms);
1185 struct ldlm_callback_suite {
1186 ldlm_completion_callback lcs_completion;
1187 ldlm_blocking_callback lcs_blocking;
1188 ldlm_glimpse_callback lcs_glimpse;
1192 #ifdef HAVE_SERVER_SUPPORT
1193 /** \defgroup ldlm_srv_ast Server AST handlers
1194 * These are AST handlers used by server code.
1195 * Their property is that they are just preparing RPCs to be sent to clients.
1198 int ldlm_server_blocking_ast(struct ldlm_lock *, struct ldlm_lock_desc *,
1199 void *data, int flag);
1200 int ldlm_server_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data);
1201 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data);
1202 int ldlm_glimpse_locks(struct ldlm_resource *res,
1203 struct list_head *gl_work_list);
1204 /** @} ldlm_srv_ast */
1206 /** \defgroup ldlm_handlers Server LDLM handlers
1207 * These are handler functions that should be called by "frontends" such as
1208 * MDT or OST to pass through LDLM requests to LDLM for handling
1211 int ldlm_handle_enqueue(struct ptlrpc_request *req, ldlm_completion_callback,
1212 ldlm_blocking_callback, ldlm_glimpse_callback);
1213 int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req,
1214 const struct ldlm_request *dlm_req,
1215 const struct ldlm_callback_suite *cbs);
1216 int ldlm_handle_convert(struct ptlrpc_request *req);
1217 int ldlm_handle_convert0(struct ptlrpc_request *req,
1218 const struct ldlm_request *dlm_req);
1219 int ldlm_handle_cancel(struct ptlrpc_request *req);
1220 int ldlm_request_cancel(struct ptlrpc_request *req,
1221 const struct ldlm_request *dlm_req, int first);
1222 /** @} ldlm_handlers */
1224 void ldlm_revoke_export_locks(struct obd_export *exp);
1226 int ldlm_del_waiting_lock(struct ldlm_lock *lock);
1227 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout);
1228 int ldlm_get_ref(void);
1229 void ldlm_put_ref(void);
1230 int ldlm_init_export(struct obd_export *exp);
1231 void ldlm_destroy_export(struct obd_export *exp);
1232 struct ldlm_lock *ldlm_request_lock(struct ptlrpc_request *req);
1235 #ifdef HAVE_SERVER_SUPPORT
1236 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res);
1238 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg);
1239 void ldlm_lock2handle(const struct ldlm_lock *lock,
1240 struct lustre_handle *lockh);
1241 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *, __u64 flags);
1242 void ldlm_cancel_callback(struct ldlm_lock *);
1243 int ldlm_lock_remove_from_lru(struct ldlm_lock *);
1244 int ldlm_lock_set_data(struct lustre_handle *, void *);
1247 * Obtain a lock reference by its handle.
1249 static inline struct ldlm_lock *ldlm_handle2lock(const struct lustre_handle *h)
1251 return __ldlm_handle2lock(h, 0);
1254 #define LDLM_LOCK_REF_DEL(lock) \
1255 lu_ref_del(&lock->l_reference, "handle", current)
1257 static inline struct ldlm_lock *
1258 ldlm_handle2lock_long(const struct lustre_handle *h, __u64 flags)
1260 struct ldlm_lock *lock;
1262 lock = __ldlm_handle2lock(h, flags);
1264 LDLM_LOCK_REF_DEL(lock);
1269 * Update Lock Value Block Operations (LVBO) on a resource taking into account
1270 * data from reqest \a r
1272 static inline int ldlm_res_lvbo_update(struct ldlm_resource *res,
1273 struct ptlrpc_request *r, int increase)
1277 /* delayed lvb init may be required */
1278 rc = ldlm_lvbo_init(res);
1280 CERROR("delayed lvb init failed (rc %d)\n", rc);
1284 if (ldlm_res_to_ns(res)->ns_lvbo &&
1285 ldlm_res_to_ns(res)->ns_lvbo->lvbo_update) {
1286 return ldlm_res_to_ns(res)->ns_lvbo->lvbo_update(res, r,
1292 int ldlm_error2errno(ldlm_error_t error);
1293 ldlm_error_t ldlm_errno2error(int err_no); /* don't call it `errno': this
1294 * confuses user-space. */
1295 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1296 void ldlm_dump_export_locks(struct obd_export *exp);
1300 * Release a temporary lock reference obtained by ldlm_handle2lock() or
1301 * __ldlm_handle2lock().
1303 #define LDLM_LOCK_PUT(lock) \
1305 LDLM_LOCK_REF_DEL(lock); \
1306 /*LDLM_DEBUG((lock), "put");*/ \
1307 ldlm_lock_put(lock); \
1311 * Release a lock reference obtained by some other means (see
1314 #define LDLM_LOCK_RELEASE(lock) \
1316 /*LDLM_DEBUG((lock), "put");*/ \
1317 ldlm_lock_put(lock); \
1320 #define LDLM_LOCK_GET(lock) \
1322 ldlm_lock_get(lock); \
1323 /*LDLM_DEBUG((lock), "get");*/ \
1327 #define ldlm_lock_list_put(head, member, count) \
1329 struct ldlm_lock *_lock, *_next; \
1331 list_for_each_entry_safe(_lock, _next, head, member) { \
1334 list_del_init(&_lock->member); \
1335 LDLM_LOCK_RELEASE(_lock); \
1340 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
1341 void ldlm_lock_put(struct ldlm_lock *lock);
1342 void ldlm_lock_destroy(struct ldlm_lock *lock);
1343 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
1344 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode);
1345 int ldlm_lock_addref_try(struct lustre_handle *lockh, __u32 mode);
1346 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode);
1347 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode);
1348 void ldlm_lock_fail_match_locked(struct ldlm_lock *lock);
1349 void ldlm_lock_fail_match(struct ldlm_lock *lock);
1350 void ldlm_lock_allow_match(struct ldlm_lock *lock);
1351 void ldlm_lock_allow_match_locked(struct ldlm_lock *lock);
1352 ldlm_mode_t ldlm_lock_match(struct ldlm_namespace *ns, __u64 flags,
1353 const struct ldlm_res_id *, ldlm_type_t type,
1354 ldlm_policy_data_t *, ldlm_mode_t mode,
1355 struct lustre_handle *, int unref);
1356 ldlm_mode_t ldlm_revalidate_lock_handle(struct lustre_handle *lockh,
1358 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
1360 void ldlm_lock_downgrade(struct ldlm_lock *lock, int new_mode);
1361 void ldlm_lock_cancel(struct ldlm_lock *lock);
1362 void ldlm_reprocess_all(struct ldlm_resource *res);
1363 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns);
1364 void ldlm_lock_dump_handle(int level, struct lustre_handle *);
1365 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req);
1368 struct ldlm_namespace *
1369 ldlm_namespace_new(struct obd_device *obd, char *name,
1370 ldlm_side_t client, ldlm_appetite_t apt,
1371 ldlm_ns_type_t ns_type);
1372 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags);
1373 void ldlm_namespace_free(struct ldlm_namespace *ns,
1374 struct obd_import *imp, int force);
1375 void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client);
1376 void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client);
1377 void ldlm_namespace_get(struct ldlm_namespace *ns);
1378 void ldlm_namespace_put(struct ldlm_namespace *ns);
1379 int ldlm_proc_setup(void);
1381 void ldlm_proc_cleanup(void);
1383 static inline void ldlm_proc_cleanup(void) {}
1386 /* resource.c - internal */
1387 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
1388 struct ldlm_resource *parent,
1389 const struct ldlm_res_id *,
1390 ldlm_type_t type, int create);
1391 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
1392 int ldlm_resource_putref(struct ldlm_resource *res);
1393 void ldlm_resource_add_lock(struct ldlm_resource *res,
1394 struct list_head *head,
1395 struct ldlm_lock *lock);
1396 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
1397 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
1398 void ldlm_dump_all_namespaces(ldlm_side_t client, int level);
1399 void ldlm_namespace_dump(int level, struct ldlm_namespace *);
1400 void ldlm_resource_dump(int level, struct ldlm_resource *);
1401 int ldlm_lock_change_resource(struct ldlm_namespace *, struct ldlm_lock *,
1402 const struct ldlm_res_id *);
1404 #define LDLM_RESOURCE_ADDREF(res) do { \
1405 lu_ref_add_atomic(&(res)->lr_reference, __FUNCTION__, current); \
1408 #define LDLM_RESOURCE_DELREF(res) do { \
1409 lu_ref_del(&(res)->lr_reference, __FUNCTION__, current); \
1412 /* ldlm_request.c */
1413 int ldlm_expired_completion_wait(void *data);
1414 /** \defgroup ldlm_local_ast Default AST handlers for local locks
1415 * These AST handlers are typically used for server-side local locks and are
1416 * also used by client-side lock handlers to perform minimum level base
1419 int ldlm_blocking_ast_nocheck(struct ldlm_lock *lock);
1420 int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1421 void *data, int flag);
1422 int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp);
1423 int ldlm_completion_ast_async(struct ldlm_lock *lock, __u64 flags, void *data);
1424 int ldlm_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data);
1425 /** @} ldlm_local_ast */
1427 /** \defgroup ldlm_cli_api API to operate on locks from actual LDLM users.
1428 * These are typically used by client and server (*_local versions)
1429 * to obtain and release locks.
1431 int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
1432 struct ldlm_enqueue_info *einfo,
1433 const struct ldlm_res_id *res_id,
1434 ldlm_policy_data_t const *policy, __u64 *flags,
1435 void *lvb, __u32 lvb_len, enum lvb_type lvb_type,
1436 struct lustre_handle *lockh, int async);
1437 int ldlm_prep_enqueue_req(struct obd_export *exp,
1438 struct ptlrpc_request *req,
1439 struct list_head *cancels,
1441 int ldlm_prep_elc_req(struct obd_export *exp, struct ptlrpc_request *req,
1442 int version, int opc, int canceloff,
1443 struct list_head *cancels, int count);
1445 struct ptlrpc_request *ldlm_enqueue_pack(struct obd_export *exp, int lvb_len);
1446 int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req,
1447 const struct ldlm_request *dlm_req,
1448 const struct ldlm_callback_suite *cbs);
1449 int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
1450 ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode,
1451 __u64 *flags, void *lvb, __u32 lvb_len,
1452 struct lustre_handle *lockh, int rc);
1453 int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
1454 const struct ldlm_res_id *res_id,
1455 ldlm_type_t type, ldlm_policy_data_t *policy,
1456 ldlm_mode_t mode, __u64 *flags,
1457 ldlm_blocking_callback blocking,
1458 ldlm_completion_callback completion,
1459 ldlm_glimpse_callback glimpse,
1460 void *data, __u32 lvb_len, enum lvb_type lvb_type,
1461 const __u64 *client_cookie,
1462 struct lustre_handle *lockh);
1463 int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new,
1464 void *data, __u32 data_len);
1465 int ldlm_cli_convert(struct lustre_handle *, int new_mode, __u32 *flags);
1466 int ldlm_cli_update_pool(struct ptlrpc_request *req);
1467 int ldlm_cli_cancel(struct lustre_handle *lockh,
1468 ldlm_cancel_flags_t cancel_flags);
1469 int ldlm_cli_cancel_unused(struct ldlm_namespace *, const struct ldlm_res_id *,
1470 ldlm_cancel_flags_t flags, void *opaque);
1471 int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
1472 const struct ldlm_res_id *res_id,
1473 ldlm_policy_data_t *policy,
1475 ldlm_cancel_flags_t flags,
1477 int ldlm_cli_cancel_req(struct obd_export *exp, struct list_head *head,
1478 int count, ldlm_cancel_flags_t flags);
1479 int ldlm_cancel_resource_local(struct ldlm_resource *res,
1480 struct list_head *cancels,
1481 ldlm_policy_data_t *policy,
1482 ldlm_mode_t mode, __u64 lock_flags,
1483 ldlm_cancel_flags_t cancel_flags, void *opaque);
1484 int ldlm_cli_cancel_list_local(struct list_head *cancels, int count,
1485 ldlm_cancel_flags_t flags);
1486 int ldlm_cli_cancel_list(struct list_head *head, int count,
1487 struct ptlrpc_request *req, ldlm_cancel_flags_t flags);
1488 /** @} ldlm_cli_api */
1491 /* This has to be here because recursive inclusion sucks. */
1492 int intent_disposition(struct ldlm_reply *rep, int flag);
1493 void intent_set_disposition(struct ldlm_reply *rep, int flag);
1496 * "Modes" of acquiring lock_res, necessary to tell lockdep that taking more
1497 * than one lock_res is dead-lock safe.
1499 enum lock_res_type {
1504 /** Lock resource. */
1505 static inline void lock_res(struct ldlm_resource *res)
1507 spin_lock(&res->lr_lock);
1510 /** Lock resource with a way to instruct lockdep code about nestedness-safe. */
1511 static inline void lock_res_nested(struct ldlm_resource *res,
1512 enum lock_res_type mode)
1514 spin_lock_nested(&res->lr_lock, mode);
1517 /** Unlock resource. */
1518 static inline void unlock_res(struct ldlm_resource *res)
1520 spin_unlock(&res->lr_lock);
1523 /** Check if resource is already locked, assert if not. */
1524 static inline void check_res_locked(struct ldlm_resource *res)
1526 assert_spin_locked(&res->lr_lock);
1529 struct ldlm_resource * lock_res_and_lock(struct ldlm_lock *lock);
1530 void unlock_res_and_lock(struct ldlm_lock *lock);
1533 /** \defgroup ldlm_pools Various LDLM pool related functions
1534 * There are not used outside of ldlm.
1537 int ldlm_pools_recalc(ldlm_side_t client);
1538 int ldlm_pools_init(void);
1539 void ldlm_pools_fini(void);
1541 int ldlm_pool_init(struct ldlm_pool *pl, struct ldlm_namespace *ns,
1542 int idx, ldlm_side_t client);
1543 int ldlm_pool_shrink(struct ldlm_pool *pl, int nr, gfp_t gfp_mask);
1544 void ldlm_pool_fini(struct ldlm_pool *pl);
1545 int ldlm_pool_setup(struct ldlm_pool *pl, int limit);
1546 int ldlm_pool_recalc(struct ldlm_pool *pl);
1547 __u32 ldlm_pool_get_lvf(struct ldlm_pool *pl);
1548 __u64 ldlm_pool_get_slv(struct ldlm_pool *pl);
1549 __u64 ldlm_pool_get_clv(struct ldlm_pool *pl);
1550 __u32 ldlm_pool_get_limit(struct ldlm_pool *pl);
1551 void ldlm_pool_set_slv(struct ldlm_pool *pl, __u64 slv);
1552 void ldlm_pool_set_clv(struct ldlm_pool *pl, __u64 clv);
1553 void ldlm_pool_set_limit(struct ldlm_pool *pl, __u32 limit);
1554 void ldlm_pool_add(struct ldlm_pool *pl, struct ldlm_lock *lock);
1555 void ldlm_pool_del(struct ldlm_pool *pl, struct ldlm_lock *lock);