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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/
34 * Lustre is a trademark of Sun Microsystems, Inc.
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,
214 int (*po_setup)(struct ldlm_pool *pl, int limit);
217 /** One second for pools thread check interval. Each pool has own period. */
218 #define LDLM_POOLS_THREAD_PERIOD (1)
220 /** ~6% margin for modest pools. See ldlm_pool.c for details. */
221 #define LDLM_POOLS_MODEST_MARGIN_SHIFT (4)
223 /** Default recalc period for server side pools in sec. */
224 #define LDLM_POOL_SRV_DEF_RECALC_PERIOD (1)
226 /** Default recalc period for client side pools in sec. */
227 #define LDLM_POOL_CLI_DEF_RECALC_PERIOD (10)
230 * LDLM pool structure to track granted locks.
231 * For purposes of determining when to release locks on e.g. memory pressure.
232 * This feature is commonly referred to as lru_resize.
235 /** Pool proc directory. */
236 struct proc_dir_entry *pl_proc_dir;
237 /** Pool name, must be long enough to hold compound proc entry name. */
239 /** Lock for protecting SLV/CLV updates. */
241 /** Number of allowed locks in in pool, both, client and server side. */
243 /** Number of granted locks in */
245 /** Grant rate per T. */
246 atomic_t pl_grant_rate;
247 /** Cancel rate per T. */
248 atomic_t pl_cancel_rate;
249 /** Server lock volume (SLV). Protected by pl_lock. */
250 __u64 pl_server_lock_volume;
251 /** Current biggest client lock volume. Protected by pl_lock. */
252 __u64 pl_client_lock_volume;
253 /** Lock volume factor. SLV on client is calculated as following:
254 * server_slv * lock_volume_factor. */
255 atomic_t pl_lock_volume_factor;
256 /** Time when last SLV from server was obtained. */
257 time_t pl_recalc_time;
258 /** Recalculation period for pool. */
259 time_t pl_recalc_period;
260 /** Recalculation and shrink operations. */
261 const struct ldlm_pool_ops *pl_ops;
262 /** Number of planned locks for next period. */
264 /** Pool statistics. */
265 struct lprocfs_stats *pl_stats;
268 typedef int (*ldlm_res_policy)(struct ldlm_namespace *, struct ldlm_lock **,
269 void *req_cookie, ldlm_mode_t mode, __u64 flags,
272 typedef int (*ldlm_cancel_for_recovery)(struct ldlm_lock *lock);
276 * LVB is Lock Value Block. This is a special opaque (to LDLM) value that could
277 * be associated with an LDLM lock and transferred from client to server and
280 * Currently LVBs are used by:
281 * - OSC-OST code to maintain current object size/times
282 * - layout lock code to return the layout when the layout lock is granted
284 struct ldlm_valblock_ops {
285 int (*lvbo_init)(struct ldlm_resource *res);
286 int (*lvbo_update)(struct ldlm_resource *res,
287 struct ptlrpc_request *r,
289 int (*lvbo_free)(struct ldlm_resource *res);
290 /* Return size of lvb data appropriate RPC size can be reserved */
291 int (*lvbo_size)(struct ldlm_lock *lock);
292 /* Called to fill in lvb data to RPC buffer @buf */
293 int (*lvbo_fill)(struct ldlm_lock *lock, void *buf, int buflen);
297 * LDLM pools related, type of lock pool in the namespace.
298 * Greedy means release cached locks aggressively
301 LDLM_NAMESPACE_GREEDY = 1 << 0,
302 LDLM_NAMESPACE_MODEST = 1 << 1
306 * Default values for the "max_nolock_size", "contention_time" and
307 * "contended_locks" namespace tunables.
309 #define NS_DEFAULT_MAX_NOLOCK_BYTES 0
310 #define NS_DEFAULT_CONTENTION_SECONDS 2
311 #define NS_DEFAULT_CONTENDED_LOCKS 32
313 struct ldlm_ns_bucket {
314 /** back pointer to namespace */
315 struct ldlm_namespace *nsb_namespace;
317 * Estimated lock callback time. Used by adaptive timeout code to
318 * avoid spurious client evictions due to unresponsiveness when in
319 * fact the network or overall system load is at fault
321 struct adaptive_timeout nsb_at_estimate;
325 /** LDLM namespace lock stats */
332 LDLM_NS_TYPE_UNKNOWN = 0,
350 * Namespace serves to contain locks related to a particular service.
351 * There are two kinds of namespaces:
352 * - Server namespace has knowledge of all locks and is therefore authoritative
353 * to make decisions like what locks could be granted and what conflicts
354 * exist during new lock enqueue.
355 * - Client namespace only has limited knowledge about locks in the namespace,
356 * only seeing locks held by the client.
358 * Every Lustre service has one server namespace present on the server serving
359 * that service. Every client connected to the service has a client namespace
361 * Every lock obtained by client in that namespace is actually represented by
362 * two in-memory locks. One on the server and one on the client. The locks are
363 * linked by a special cookie by which one node can tell to the other which lock
364 * it actually means during communications. Such locks are called remote locks.
365 * The locks held by server only without any reference to a client are called
368 struct ldlm_namespace {
369 /** Backward link to OBD, required for LDLM pool to store new SLV. */
370 struct obd_device *ns_obd;
372 /** Flag indicating if namespace is on client instead of server */
373 ldlm_side_t ns_client;
375 /** Resource hash table for namespace. */
376 struct cfs_hash *ns_rs_hash;
381 /** big refcount (by bucket) */
385 * Namespace connect flags supported by server (may be changed via
386 * /proc, LRU resize may be disabled/enabled).
388 __u64 ns_connect_flags;
390 /** Client side original connect flags supported by server. */
391 __u64 ns_orig_connect_flags;
393 /* namespace proc dir entry */
394 struct proc_dir_entry *ns_proc_dir_entry;
397 * Position in global namespace list linking all namespaces on
400 struct list_head ns_list_chain;
403 * List of unused locks for this namespace. This list is also called
405 * Unused locks are locks with zero reader/writer reference counts.
406 * This list is only used on clients for lock caching purposes.
407 * When we want to release some locks voluntarily or if server wants
408 * us to release some locks due to e.g. memory pressure, we take locks
409 * to release from the head of this list.
410 * Locks are linked via l_lru field in \see struct ldlm_lock.
412 struct list_head ns_unused_list;
413 /** Number of locks in the LRU list above */
417 * Maximum number of locks permitted in the LRU. If 0, means locks
418 * are managed by pools and there is no preset limit, rather it is all
419 * controlled by available memory on this client and on server.
421 unsigned int ns_max_unused;
422 /** Maximum allowed age (last used time) for locks in the LRU */
423 unsigned int ns_max_age;
425 * Server only: number of times we evicted clients due to lack of reply
428 unsigned int ns_timeouts;
430 * Number of seconds since the file change time after which the
431 * MDT will return an UPDATE lock along with a LOOKUP lock.
432 * This allows the client to start caching negative dentries
433 * for a directory and may save an RPC for a later stat.
435 unsigned int ns_ctime_age_limit;
438 * Used to rate-limit ldlm_namespace_dump calls.
439 * \see ldlm_namespace_dump. Increased by 10 seconds every time
442 unsigned long ns_next_dump;
444 /** "policy" function that does actual lock conflict determination */
445 ldlm_res_policy ns_policy;
448 * LVB operations for this namespace.
449 * \see struct ldlm_valblock_ops
451 struct ldlm_valblock_ops *ns_lvbo;
454 * Used by filter code to store pointer to OBD of the service.
455 * Should be dropped in favor of \a ns_obd
460 * Wait queue used by __ldlm_namespace_free. Gets woken up every time
461 * a resource is removed.
463 wait_queue_head_t ns_waitq;
464 /** LDLM pool structure for this namespace */
465 struct ldlm_pool ns_pool;
466 /** Definition of how eagerly unused locks will be released from LRU */
467 ldlm_appetite_t ns_appetite;
470 * If more than \a ns_contended_locks are found, the resource is
471 * considered to be contended. Lock enqueues might specify that no
472 * contended locks should be granted
474 unsigned ns_contended_locks;
477 * The resources in this namespace remember contended state during
478 * \a ns_contention_time, in seconds.
480 unsigned ns_contention_time;
483 * Limit size of contended extent locks, in bytes.
484 * If extended lock is requested for more then this many bytes and
485 * caller instructs us not to grant contended locks, we would disregard
488 unsigned ns_max_nolock_size;
490 /** Limit of parallel AST RPC count. */
491 unsigned ns_max_parallel_ast;
493 /** Callback to cancel locks before replaying it during recovery. */
494 ldlm_cancel_for_recovery ns_cancel_for_recovery;
496 /** LDLM lock stats */
497 struct lprocfs_stats *ns_stats;
500 * Flag to indicate namespace is being freed. Used to determine if
501 * recalculation of LDLM pool statistics should be skipped.
503 unsigned ns_stopping:1;
507 * Returns 1 if namespace \a ns is a client namespace.
509 static inline int ns_is_client(struct ldlm_namespace *ns)
512 LASSERT(!(ns->ns_client & ~(LDLM_NAMESPACE_CLIENT |
513 LDLM_NAMESPACE_SERVER)));
514 LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT ||
515 ns->ns_client == LDLM_NAMESPACE_SERVER);
516 return ns->ns_client == LDLM_NAMESPACE_CLIENT;
520 * Returns 1 if namespace \a ns is a server namespace.
522 static inline int ns_is_server(struct ldlm_namespace *ns)
525 LASSERT(!(ns->ns_client & ~(LDLM_NAMESPACE_CLIENT |
526 LDLM_NAMESPACE_SERVER)));
527 LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT ||
528 ns->ns_client == LDLM_NAMESPACE_SERVER);
529 return ns->ns_client == LDLM_NAMESPACE_SERVER;
533 * Returns 1 if namespace \a ns supports early lock cancel (ELC).
535 static inline int ns_connect_cancelset(struct ldlm_namespace *ns)
538 return !!(ns->ns_connect_flags & OBD_CONNECT_CANCELSET);
542 * Returns 1 if this namespace supports lru_resize.
544 static inline int ns_connect_lru_resize(struct ldlm_namespace *ns)
547 return !!(ns->ns_connect_flags & OBD_CONNECT_LRU_RESIZE);
550 static inline void ns_register_cancel(struct ldlm_namespace *ns,
551 ldlm_cancel_for_recovery arg)
554 ns->ns_cancel_for_recovery = arg;
559 /** Type for blocking callback function of a lock. */
560 typedef int (*ldlm_blocking_callback)(struct ldlm_lock *lock,
561 struct ldlm_lock_desc *new, void *data,
563 /** Type for completion callback function of a lock. */
564 typedef int (*ldlm_completion_callback)(struct ldlm_lock *lock, __u64 flags,
566 /** Type for glimpse callback function of a lock. */
567 typedef int (*ldlm_glimpse_callback)(struct ldlm_lock *lock, void *data);
569 /** Work list for sending GL ASTs to multiple locks. */
570 struct ldlm_glimpse_work {
571 struct ldlm_lock *gl_lock; /* lock to glimpse */
572 struct list_head gl_list; /* linkage to other gl work structs */
573 __u32 gl_flags;/* see LDLM_GL_WORK_* below */
574 union ldlm_gl_desc *gl_desc; /* glimpse descriptor to be packed in
575 * glimpse callback request */
578 /** The ldlm_glimpse_work is allocated on the stack and should not be freed. */
579 #define LDLM_GL_WORK_NOFREE 0x1
581 /** Interval node data for each LDLM_EXTENT lock. */
582 struct ldlm_interval {
583 struct interval_node li_node; /* node for tree management */
584 struct list_head li_group; /* the locks which have the same
585 * policy - group of the policy */
587 #define to_ldlm_interval(n) container_of(n, struct ldlm_interval, li_node)
590 * Interval tree for extent locks.
591 * The interval tree must be accessed under the resource lock.
592 * Interval trees are used for granted extent locks to speed up conflicts
593 * lookup. See ldlm/interval_tree.c for more details.
595 struct ldlm_interval_tree {
598 ldlm_mode_t lit_mode; /* lock mode */
599 struct interval_node *lit_root; /* actual ldlm_interval */
602 /** Whether to track references to exports by LDLM locks. */
603 #define LUSTRE_TRACKS_LOCK_EXP_REFS (0)
607 LCF_ASYNC = 0x1, /* Cancel locks asynchronously. */
608 LCF_LOCAL = 0x2, /* Cancel locks locally, not notifing server */
609 LCF_BL_AST = 0x4, /* Cancel locks marked as LDLM_FL_BL_AST
611 } ldlm_cancel_flags_t;
617 __u64 blocking_owner;
618 struct obd_export *blocking_export;
619 /* Protected by the hash lock */
625 struct ldlm_extent l_extent;
626 struct ldlm_flock l_flock;
627 struct ldlm_inodebits l_inodebits;
628 } ldlm_policy_data_t;
630 void ldlm_convert_policy_to_wire(ldlm_type_t type,
631 const ldlm_policy_data_t *lpolicy,
632 ldlm_wire_policy_data_t *wpolicy);
633 void ldlm_convert_policy_to_local(struct obd_export *exp, ldlm_type_t type,
634 const ldlm_wire_policy_data_t *wpolicy,
635 ldlm_policy_data_t *lpolicy);
645 * LDLM lock structure
647 * Represents a single LDLM lock and its state in memory. Each lock is
648 * associated with a single ldlm_resource, the object which is being
649 * locked. There may be multiple ldlm_locks on a single resource,
650 * depending on the lock type and whether the locks are conflicting or
656 * When remote side wants to tell us about a lock, they address
657 * it by this opaque handle. The handle does not hold a
658 * reference on the ldlm_lock, so it can be safely passed to
659 * other threads or nodes. When the lock needs to be accessed
660 * from the handle, it is looked up again in the lock table, and
661 * may no longer exist.
663 * Must be first in the structure.
665 struct portals_handle l_handle;
667 * Lock reference count.
668 * This is how many users have pointers to actual structure, so that
669 * we do not accidentally free lock structure that is in use.
673 * Internal spinlock protects l_resource. We should hold this lock
674 * first before taking res_lock.
678 * Pointer to actual resource this lock is in.
679 * ldlm_lock_change_resource() can change this.
681 struct ldlm_resource *l_resource;
683 * List item for client side LRU list.
684 * Protected by ns_lock in struct ldlm_namespace.
686 struct list_head l_lru;
688 * Linkage to resource's lock queues according to current lock state.
689 * (could be granted, waiting or converting)
690 * Protected by lr_lock in struct ldlm_resource.
692 struct list_head l_res_link;
694 * Tree node for ldlm_extent.
696 struct ldlm_interval *l_tree_node;
698 * Per export hash of locks.
699 * Protected by per-bucket exp->exp_lock_hash locks.
701 struct hlist_node l_exp_hash;
703 * Per export hash of flock locks.
704 * Protected by per-bucket exp->exp_flock_hash locks.
706 struct hlist_node l_exp_flock_hash;
709 * Protected by lr_lock.
711 ldlm_mode_t l_req_mode;
713 * Granted mode, also protected by lr_lock.
715 ldlm_mode_t l_granted_mode;
716 /** Lock completion handler pointer. Called when lock is granted. */
717 ldlm_completion_callback l_completion_ast;
719 * Lock blocking AST handler pointer.
720 * It plays two roles:
721 * - as a notification of an attempt to queue a conflicting lock (once)
722 * - as a notification when the lock is being cancelled.
724 * As such it's typically called twice: once for the initial conflict
725 * and then once more when the last user went away and the lock is
726 * cancelled (could happen recursively).
728 ldlm_blocking_callback l_blocking_ast;
730 * Lock glimpse handler.
731 * Glimpse handler is used to obtain LVB updates from a client by
734 ldlm_glimpse_callback l_glimpse_ast;
738 * This is a pointer to actual client export for locks that were granted
739 * to clients. Used server-side.
741 struct obd_export *l_export;
743 * Lock connection export.
744 * Pointer to server export on a client.
746 struct obd_export *l_conn_export;
749 * Remote lock handle.
750 * If the lock is remote, this is the handle of the other side lock
753 struct lustre_handle l_remote_handle;
756 * Representation of private data specific for a lock type.
757 * Examples are: extent range for extent lock or bitmask for ibits locks
759 ldlm_policy_data_t l_policy_data;
762 * Lock state flags. Protected by lr_lock.
763 * \see lustre_dlm_flags.h where the bits are defined.
768 * Lock r/w usage counters.
769 * Protected by lr_lock.
774 * If the lock is granted, a process sleeps on this waitq to learn when
775 * it's no longer in use. If the lock is not granted, a process sleeps
776 * on this waitq to learn when it becomes granted.
778 wait_queue_head_t l_waitq;
781 * Seconds. It will be updated if there is any activity related to
782 * the lock, e.g. enqueue the lock or send blocking AST.
784 unsigned long l_last_activity;
787 * Time last used by e.g. being matched by lock match.
788 * Jiffies. Should be converted to time if needed.
790 unsigned long l_last_used;
792 /** Originally requested extent for the extent lock. */
793 struct ldlm_extent l_req_extent;
796 * Client-side-only members.
799 enum lvb_type l_lvb_type;
802 * Temporary storage for a LVB received during an enqueue operation.
807 /** Private storage for lock user. Opaque to LDLM. */
811 * Server-side-only members.
815 * Connection cookie for the client originating the operation.
816 * Used by Commit on Share (COS) code. Currently only used for
817 * inodebits locks on MDS.
819 __u64 l_client_cookie;
822 * List item for locks waiting for cancellation from clients.
823 * The lists this could be linked into are:
824 * waiting_locks_list (protected by waiting_locks_spinlock),
825 * then if the lock timed out, it is moved to
826 * expired_lock_thread.elt_expired_locks for further processing.
827 * Protected by elt_lock.
829 struct list_head l_pending_chain;
832 * Set when lock is sent a blocking AST. Time in seconds when timeout
833 * is reached and client holding this lock could be evicted.
834 * This timeout could be further extended by e.g. certain IO activity
836 * \see ost_rw_prolong_locks
838 unsigned long l_callback_timeout;
840 /** Local PID of process which created this lock. */
844 * Number of times blocking AST was sent for this lock.
845 * This is for debugging. Valid values are 0 and 1, if there is an
846 * attempt to send blocking AST more than once, an assertion would be
847 * hit. \see ldlm_work_bl_ast_lock
850 /** List item ldlm_add_ast_work_item() for case of blocking ASTs. */
851 struct list_head l_bl_ast;
852 /** List item ldlm_add_ast_work_item() for case of completion ASTs. */
853 struct list_head l_cp_ast;
854 /** For ldlm_add_ast_work_item() for "revoke" AST used in COS. */
855 struct list_head l_rk_ast;
858 * Pointer to a conflicting lock that caused blocking AST to be sent
861 struct ldlm_lock *l_blocking_lock;
864 * Protected by lr_lock, linkages to "skip lists".
865 * For more explanations of skip lists see ldlm/ldlm_inodebits.c
867 struct list_head l_sl_mode;
868 struct list_head l_sl_policy;
870 /** Reference tracking structure to debug leaked locks. */
871 struct lu_ref l_reference;
872 #if LUSTRE_TRACKS_LOCK_EXP_REFS
873 /* Debugging stuff for bug 20498, for tracking export references. */
874 /** number of export references taken */
876 /** link all locks referencing one export */
877 struct list_head l_exp_refs_link;
878 /** referenced export object */
879 struct obd_export *l_exp_refs_target;
882 * export blocking dlm lock list, protected by
883 * l_export->exp_bl_list_lock.
884 * Lock order of waiting_lists_spinlock, exp_bl_list_lock and res lock
885 * is: res lock -> exp_bl_list_lock -> wanting_lists_spinlock.
887 struct list_head l_exp_list;
891 * LDLM resource description.
892 * Basically, resource is a representation for a single object.
893 * Object has a name which is currently 4 64-bit integers. LDLM user is
894 * responsible for creation of a mapping between objects it wants to be
895 * protected and resource names.
897 * A resource can only hold locks of a single lock type, though there may be
898 * multiple ldlm_locks on a single resource, depending on the lock type and
899 * whether the locks are conflicting or not.
901 struct ldlm_resource {
902 struct ldlm_ns_bucket *lr_ns_bucket;
905 * List item for list in namespace hash.
906 * protected by ns_lock
908 struct hlist_node lr_hash;
910 /** Spinlock to protect locks under this resource. */
914 * protected by lr_lock
916 /** List of locks in granted state */
917 struct list_head lr_granted;
918 /** List of locks waiting to change their granted mode (converted) */
919 struct list_head lr_converting;
921 * List of locks that could not be granted due to conflicts and
922 * that are waiting for conflicts to go away */
923 struct list_head lr_waiting;
926 /* XXX No longer needed? Remove ASAP */
927 ldlm_mode_t lr_most_restr;
929 /** Type of locks this resource can hold. Only one type per resource. */
930 ldlm_type_t lr_type; /* LDLM_{PLAIN,EXTENT,FLOCK,IBITS} */
933 struct ldlm_res_id lr_name;
934 /** Reference count for this resource */
935 atomic_t lr_refcount;
938 * Interval trees (only for extent locks) for all modes of this resource
940 struct ldlm_interval_tree lr_itree[LCK_MODE_NUM];
943 * Server-side-only lock value block elements.
944 * To serialize lvbo_init.
946 struct mutex lr_lvb_mutex;
948 /** protected by lr_lock */
951 /** When the resource was considered as contended. */
952 unsigned long lr_contention_time;
953 /** List of references to this resource. For debugging. */
954 struct lu_ref lr_reference;
956 struct inode *lr_lvb_inode;
959 static inline bool ldlm_has_layout(struct ldlm_lock *lock)
961 return lock->l_resource->lr_type == LDLM_IBITS &&
962 lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_LAYOUT;
966 ldlm_ns_name(struct ldlm_namespace *ns)
968 return ns->ns_rs_hash->hs_name;
971 static inline struct ldlm_namespace *
972 ldlm_res_to_ns(struct ldlm_resource *res)
974 return res->lr_ns_bucket->nsb_namespace;
977 static inline struct ldlm_namespace *
978 ldlm_lock_to_ns(struct ldlm_lock *lock)
980 return ldlm_res_to_ns(lock->l_resource);
984 ldlm_lock_to_ns_name(struct ldlm_lock *lock)
986 return ldlm_ns_name(ldlm_lock_to_ns(lock));
989 static inline struct adaptive_timeout *
990 ldlm_lock_to_ns_at(struct ldlm_lock *lock)
992 return &lock->l_resource->lr_ns_bucket->nsb_at_estimate;
995 static inline int ldlm_lvbo_init(struct ldlm_resource *res)
997 struct ldlm_namespace *ns = ldlm_res_to_ns(res);
999 if (ns->ns_lvbo != NULL && ns->ns_lvbo->lvbo_init != NULL)
1000 return ns->ns_lvbo->lvbo_init(res);
1005 static inline int ldlm_lvbo_size(struct ldlm_lock *lock)
1007 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
1009 if (ns->ns_lvbo != NULL && ns->ns_lvbo->lvbo_size != NULL)
1010 return ns->ns_lvbo->lvbo_size(lock);
1015 static inline int ldlm_lvbo_fill(struct ldlm_lock *lock, void *buf, int len)
1017 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
1019 if (ns->ns_lvbo != NULL) {
1020 LASSERT(ns->ns_lvbo->lvbo_fill != NULL);
1021 return ns->ns_lvbo->lvbo_fill(lock, buf, len);
1026 struct ldlm_ast_work {
1027 struct ldlm_lock *w_lock;
1029 struct ldlm_lock_desc w_desc;
1030 struct list_head w_list;
1037 * Common ldlm_enqueue parameters
1039 struct ldlm_enqueue_info {
1040 __u32 ei_type; /** Type of the lock being enqueued. */
1041 __u32 ei_mode; /** Mode of the lock being enqueued. */
1042 void *ei_cb_bl; /** blocking lock callback */
1043 void *ei_cb_cp; /** lock completion callback */
1044 void *ei_cb_gl; /** lock glimpse callback */
1045 void *ei_cbdata; /** Data to be passed into callbacks. */
1048 extern struct obd_ops ldlm_obd_ops;
1050 extern char *ldlm_lockname[];
1051 extern char *ldlm_typename[];
1052 extern char *ldlm_it2str(int it);
1055 * Just a fancy CDEBUG call with log level preset to LDLM_DEBUG.
1056 * For the cases where we do not have actual lock to print along
1057 * with a debugging message that is ldlm-related
1059 #define LDLM_DEBUG_NOLOCK(format, a...) \
1060 CDEBUG(D_DLMTRACE, "### " format "\n" , ##a)
1063 * Support function for lock information printing into debug logs.
1066 #define ldlm_lock_debug(msgdata, mask, cdls, lock, fmt, a...) do { \
1067 CFS_CHECK_STACK(msgdata, mask, cdls); \
1069 if (((mask) & D_CANTMASK) != 0 || \
1070 ((libcfs_debug & (mask)) != 0 && \
1071 (libcfs_subsystem_debug & DEBUG_SUBSYSTEM) != 0)) \
1072 _ldlm_lock_debug(lock, msgdata, fmt, ##a); \
1075 void _ldlm_lock_debug(struct ldlm_lock *lock,
1076 struct libcfs_debug_msg_data *data,
1077 const char *fmt, ...)
1081 * Rate-limited version of lock printing function.
1083 #define LDLM_DEBUG_LIMIT(mask, lock, fmt, a...) do { \
1084 static struct cfs_debug_limit_state _ldlm_cdls; \
1085 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, mask, &_ldlm_cdls); \
1086 ldlm_lock_debug(&msgdata, mask, &_ldlm_cdls, lock, "### " fmt , ##a);\
1089 #define LDLM_ERROR(lock, fmt, a...) LDLM_DEBUG_LIMIT(D_ERROR, lock, fmt, ## a)
1090 #define LDLM_WARN(lock, fmt, a...) LDLM_DEBUG_LIMIT(D_WARNING, lock, fmt, ## a)
1092 /** Non-rate-limited lock printing function for debugging purposes. */
1093 #define LDLM_DEBUG(lock, fmt, a...) do { \
1094 if (likely(lock != NULL)) { \
1095 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_DLMTRACE, NULL); \
1096 ldlm_lock_debug(&msgdata, D_DLMTRACE, NULL, lock, \
1097 "### " fmt , ##a); \
1099 LDLM_DEBUG_NOLOCK("no dlm lock: " fmt, ##a); \
1103 typedef int (*ldlm_processing_policy)(struct ldlm_lock *lock, __u64 *flags,
1104 int first_enq, ldlm_error_t *err,
1105 struct list_head *work_list);
1108 * Return values for lock iterators.
1109 * Also used during deciding of lock grants and cancellations.
1111 #define LDLM_ITER_CONTINUE 1 /* keep iterating */
1112 #define LDLM_ITER_STOP 2 /* stop iterating */
1114 typedef int (*ldlm_iterator_t)(struct ldlm_lock *, void *);
1115 typedef int (*ldlm_res_iterator_t)(struct ldlm_resource *, void *);
1117 /** \defgroup ldlm_iterator Lock iterators
1119 * LDLM provides for a way to iterate through every lock on a resource or
1120 * namespace or every resource in a namespace.
1122 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
1124 void ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
1126 int ldlm_resource_iterate(struct ldlm_namespace *, const struct ldlm_res_id *,
1127 ldlm_iterator_t iter, void *data);
1128 /** @} ldlm_iterator */
1130 int ldlm_replay_locks(struct obd_import *imp);
1133 int ldlm_flock_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data);
1136 __u64 ldlm_extent_shift_kms(struct ldlm_lock *lock, __u64 old_kms);
1138 struct ldlm_callback_suite {
1139 ldlm_completion_callback lcs_completion;
1140 ldlm_blocking_callback lcs_blocking;
1141 ldlm_glimpse_callback lcs_glimpse;
1145 int ldlm_del_waiting_lock(struct ldlm_lock *lock);
1146 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout);
1147 int ldlm_get_ref(void);
1148 void ldlm_put_ref(void);
1149 int ldlm_init_export(struct obd_export *exp);
1150 void ldlm_destroy_export(struct obd_export *exp);
1151 struct ldlm_lock *ldlm_request_lock(struct ptlrpc_request *req);
1154 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg);
1155 void ldlm_lock2handle(const struct ldlm_lock *lock,
1156 struct lustre_handle *lockh);
1157 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *, __u64 flags);
1158 void ldlm_cancel_callback(struct ldlm_lock *);
1159 int ldlm_lock_remove_from_lru(struct ldlm_lock *);
1160 int ldlm_lock_set_data(struct lustre_handle *, void *);
1163 * Obtain a lock reference by its handle.
1165 static inline struct ldlm_lock *ldlm_handle2lock(const struct lustre_handle *h)
1167 return __ldlm_handle2lock(h, 0);
1170 #define LDLM_LOCK_REF_DEL(lock) \
1171 lu_ref_del(&lock->l_reference, "handle", current)
1173 static inline struct ldlm_lock *
1174 ldlm_handle2lock_long(const struct lustre_handle *h, __u64 flags)
1176 struct ldlm_lock *lock;
1178 lock = __ldlm_handle2lock(h, flags);
1180 LDLM_LOCK_REF_DEL(lock);
1185 * Update Lock Value Block Operations (LVBO) on a resource taking into account
1186 * data from request \a r
1188 static inline int ldlm_res_lvbo_update(struct ldlm_resource *res,
1189 struct ptlrpc_request *r, int increase)
1191 if (ldlm_res_to_ns(res)->ns_lvbo &&
1192 ldlm_res_to_ns(res)->ns_lvbo->lvbo_update) {
1193 return ldlm_res_to_ns(res)->ns_lvbo->lvbo_update(res, r,
1199 int ldlm_error2errno(ldlm_error_t error);
1200 ldlm_error_t ldlm_errno2error(int err_no); /* don't call it `errno': this
1201 * confuses user-space. */
1202 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1203 void ldlm_dump_export_locks(struct obd_export *exp);
1207 * Release a temporary lock reference obtained by ldlm_handle2lock() or
1208 * __ldlm_handle2lock().
1210 #define LDLM_LOCK_PUT(lock) \
1212 LDLM_LOCK_REF_DEL(lock); \
1213 /*LDLM_DEBUG((lock), "put");*/ \
1214 ldlm_lock_put(lock); \
1218 * Release a lock reference obtained by some other means (see
1221 #define LDLM_LOCK_RELEASE(lock) \
1223 /*LDLM_DEBUG((lock), "put");*/ \
1224 ldlm_lock_put(lock); \
1227 #define LDLM_LOCK_GET(lock) \
1229 ldlm_lock_get(lock); \
1230 /*LDLM_DEBUG((lock), "get");*/ \
1234 #define ldlm_lock_list_put(head, member, count) \
1236 struct ldlm_lock *_lock, *_next; \
1238 list_for_each_entry_safe(_lock, _next, head, member) { \
1241 list_del_init(&_lock->member); \
1242 LDLM_LOCK_RELEASE(_lock); \
1247 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
1248 void ldlm_lock_put(struct ldlm_lock *lock);
1249 void ldlm_lock_destroy(struct ldlm_lock *lock);
1250 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
1251 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode);
1252 int ldlm_lock_addref_try(struct lustre_handle *lockh, __u32 mode);
1253 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode);
1254 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode);
1255 void ldlm_lock_fail_match_locked(struct ldlm_lock *lock);
1256 void ldlm_lock_fail_match(struct ldlm_lock *lock);
1257 void ldlm_lock_allow_match(struct ldlm_lock *lock);
1258 void ldlm_lock_allow_match_locked(struct ldlm_lock *lock);
1259 ldlm_mode_t ldlm_lock_match(struct ldlm_namespace *ns, __u64 flags,
1260 const struct ldlm_res_id *, ldlm_type_t type,
1261 ldlm_policy_data_t *, ldlm_mode_t mode,
1262 struct lustre_handle *, int unref);
1263 ldlm_mode_t ldlm_revalidate_lock_handle(struct lustre_handle *lockh,
1265 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
1267 void ldlm_lock_downgrade(struct ldlm_lock *lock, int new_mode);
1268 void ldlm_lock_cancel(struct ldlm_lock *lock);
1269 void ldlm_reprocess_all(struct ldlm_resource *res);
1270 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns);
1271 void ldlm_lock_dump_handle(int level, struct lustre_handle *);
1272 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req);
1275 struct ldlm_namespace *
1276 ldlm_namespace_new(struct obd_device *obd, char *name,
1277 ldlm_side_t client, ldlm_appetite_t apt,
1278 ldlm_ns_type_t ns_type);
1279 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags);
1280 void ldlm_namespace_free(struct ldlm_namespace *ns,
1281 struct obd_import *imp, int force);
1282 void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client);
1283 void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client);
1284 void ldlm_namespace_get(struct ldlm_namespace *ns);
1285 void ldlm_namespace_put(struct ldlm_namespace *ns);
1286 #if defined (CONFIG_PROC_FS)
1287 int ldlm_proc_setup(void);
1288 void ldlm_proc_cleanup(void);
1290 static inline int ldlm_proc_setup(void) { return 0; }
1291 static inline void ldlm_proc_cleanup(void) {}
1294 /* resource.c - internal */
1295 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
1296 struct ldlm_resource *parent,
1297 const struct ldlm_res_id *,
1298 ldlm_type_t type, int create);
1299 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
1300 int ldlm_resource_putref(struct ldlm_resource *res);
1301 void ldlm_resource_add_lock(struct ldlm_resource *res,
1302 struct list_head *head,
1303 struct ldlm_lock *lock);
1304 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
1305 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
1306 void ldlm_dump_all_namespaces(ldlm_side_t client, int level);
1307 void ldlm_namespace_dump(int level, struct ldlm_namespace *);
1308 void ldlm_resource_dump(int level, struct ldlm_resource *);
1309 int ldlm_lock_change_resource(struct ldlm_namespace *, struct ldlm_lock *,
1310 const struct ldlm_res_id *);
1312 #define LDLM_RESOURCE_ADDREF(res) do { \
1313 lu_ref_add_atomic(&(res)->lr_reference, __func__, current); \
1316 #define LDLM_RESOURCE_DELREF(res) do { \
1317 lu_ref_del(&(res)->lr_reference, __func__, current); \
1320 /* ldlm_request.c */
1321 int ldlm_expired_completion_wait(void *data);
1322 /** \defgroup ldlm_local_ast Default AST handlers for local locks
1323 * These AST handlers are typically used for server-side local locks and are
1324 * also used by client-side lock handlers to perform minimum level base
1327 int ldlm_blocking_ast_nocheck(struct ldlm_lock *lock);
1328 int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1329 void *data, int flag);
1330 int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp);
1331 int ldlm_completion_ast_async(struct ldlm_lock *lock, __u64 flags, void *data);
1332 int ldlm_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data);
1333 /** @} ldlm_local_ast */
1335 /** \defgroup ldlm_cli_api API to operate on locks from actual LDLM users.
1336 * These are typically used by client and server (*_local versions)
1337 * to obtain and release locks.
1339 int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
1340 struct ldlm_enqueue_info *einfo,
1341 const struct ldlm_res_id *res_id,
1342 ldlm_policy_data_t const *policy, __u64 *flags,
1343 void *lvb, __u32 lvb_len, enum lvb_type lvb_type,
1344 struct lustre_handle *lockh, int async);
1345 int ldlm_prep_enqueue_req(struct obd_export *exp,
1346 struct ptlrpc_request *req,
1347 struct list_head *cancels,
1349 int ldlm_prep_elc_req(struct obd_export *exp,
1350 struct ptlrpc_request *req,
1351 int version, int opc, int canceloff,
1352 struct list_head *cancels, int count);
1354 struct ptlrpc_request *ldlm_enqueue_pack(struct obd_export *exp, int lvb_len);
1355 int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req,
1356 const struct ldlm_request *dlm_req,
1357 const struct ldlm_callback_suite *cbs);
1358 int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
1359 ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode,
1360 __u64 *flags, void *lvb, __u32 lvb_len,
1361 struct lustre_handle *lockh, int rc);
1362 int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
1363 const struct ldlm_res_id *res_id,
1364 ldlm_type_t type, ldlm_policy_data_t *policy,
1365 ldlm_mode_t mode, __u64 *flags,
1366 ldlm_blocking_callback blocking,
1367 ldlm_completion_callback completion,
1368 ldlm_glimpse_callback glimpse,
1369 void *data, __u32 lvb_len, enum lvb_type lvb_type,
1370 const __u64 *client_cookie,
1371 struct lustre_handle *lockh);
1372 int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new,
1373 void *data, __u32 data_len);
1374 int ldlm_cli_convert(struct lustre_handle *, int new_mode, __u32 *flags);
1375 int ldlm_cli_update_pool(struct ptlrpc_request *req);
1376 int ldlm_cli_cancel(struct lustre_handle *lockh,
1377 ldlm_cancel_flags_t cancel_flags);
1378 int ldlm_cli_cancel_unused(struct ldlm_namespace *, const struct ldlm_res_id *,
1379 ldlm_cancel_flags_t flags, void *opaque);
1380 int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
1381 const struct ldlm_res_id *res_id,
1382 ldlm_policy_data_t *policy,
1384 ldlm_cancel_flags_t flags,
1386 int ldlm_cli_cancel_req(struct obd_export *exp, struct list_head *head,
1387 int count, ldlm_cancel_flags_t flags);
1388 int ldlm_cancel_resource_local(struct ldlm_resource *res,
1389 struct list_head *cancels,
1390 ldlm_policy_data_t *policy,
1391 ldlm_mode_t mode, __u64 lock_flags,
1392 ldlm_cancel_flags_t cancel_flags, void *opaque);
1393 int ldlm_cli_cancel_list_local(struct list_head *cancels, int count,
1394 ldlm_cancel_flags_t flags);
1395 int ldlm_cli_cancel_list(struct list_head *head, int count,
1396 struct ptlrpc_request *req, ldlm_cancel_flags_t flags);
1397 /** @} ldlm_cli_api */
1400 /* This has to be here because recursive inclusion sucks. */
1401 int intent_disposition(struct ldlm_reply *rep, int flag);
1402 void intent_set_disposition(struct ldlm_reply *rep, int flag);
1405 /* ioctls for trying requests */
1406 #define IOC_LDLM_TYPE 'f'
1407 #define IOC_LDLM_MIN_NR 40
1409 #define IOC_LDLM_TEST _IOWR('f', 40, long)
1410 #define IOC_LDLM_DUMP _IOWR('f', 41, long)
1411 #define IOC_LDLM_REGRESS_START _IOWR('f', 42, long)
1412 #define IOC_LDLM_REGRESS_STOP _IOWR('f', 43, long)
1413 #define IOC_LDLM_MAX_NR 43
1416 * "Modes" of acquiring lock_res, necessary to tell lockdep that taking more
1417 * than one lock_res is dead-lock safe.
1419 enum lock_res_type {
1424 /** Lock resource. */
1425 static inline void lock_res(struct ldlm_resource *res)
1427 spin_lock(&res->lr_lock);
1430 /** Lock resource with a way to instruct lockdep code about nestedness-safe. */
1431 static inline void lock_res_nested(struct ldlm_resource *res,
1432 enum lock_res_type mode)
1434 spin_lock_nested(&res->lr_lock, mode);
1437 /** Unlock resource. */
1438 static inline void unlock_res(struct ldlm_resource *res)
1440 spin_unlock(&res->lr_lock);
1443 /** Check if resource is already locked, assert if not. */
1444 static inline void check_res_locked(struct ldlm_resource *res)
1446 assert_spin_locked(&res->lr_lock);
1449 struct ldlm_resource *lock_res_and_lock(struct ldlm_lock *lock);
1450 void unlock_res_and_lock(struct ldlm_lock *lock);
1453 /** \defgroup ldlm_pools Various LDLM pool related functions
1454 * There are not used outside of ldlm.
1457 int ldlm_pools_recalc(ldlm_side_t client);
1458 int ldlm_pools_init(void);
1459 void ldlm_pools_fini(void);
1461 int ldlm_pool_init(struct ldlm_pool *pl, struct ldlm_namespace *ns,
1462 int idx, ldlm_side_t client);
1463 int ldlm_pool_shrink(struct ldlm_pool *pl, int nr,
1465 void ldlm_pool_fini(struct ldlm_pool *pl);
1466 int ldlm_pool_setup(struct ldlm_pool *pl, int limit);
1467 int ldlm_pool_recalc(struct ldlm_pool *pl);
1468 __u32 ldlm_pool_get_lvf(struct ldlm_pool *pl);
1469 __u64 ldlm_pool_get_slv(struct ldlm_pool *pl);
1470 __u64 ldlm_pool_get_clv(struct ldlm_pool *pl);
1471 __u32 ldlm_pool_get_limit(struct ldlm_pool *pl);
1472 void ldlm_pool_set_slv(struct ldlm_pool *pl, __u64 slv);
1473 void ldlm_pool_set_clv(struct ldlm_pool *pl, __u64 clv);
1474 void ldlm_pool_set_limit(struct ldlm_pool *pl, __u32 limit);
1475 void ldlm_pool_add(struct ldlm_pool *pl, struct ldlm_lock *lock);
1476 void ldlm_pool_del(struct ldlm_pool *pl, struct ldlm_lock *lock);