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27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2010, 2013, Intel Corporation.
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 #if defined(__linux__)
52 #include <linux/lustre_dlm.h>
53 #elif defined(__APPLE__)
54 #include <darwin/lustre_dlm.h>
56 #error Unsupported operating system.
59 #include <lustre_lib.h>
60 #include <lustre_net.h>
61 #include <lustre_import.h>
62 #include <lustre_handles.h>
63 #include <interval_tree.h> /* for interval_node{}, ldlm_extent */
66 #include "lustre_dlm_flags.h"
71 #define OBD_LDLM_DEVICENAME "ldlm"
73 #define LDLM_DEFAULT_LRU_SIZE (100 * num_online_cpus())
74 #define LDLM_DEFAULT_MAX_ALIVE (cfs_time_seconds(36000))
75 #define LDLM_CTIME_AGE_LIMIT (10)
76 #define LDLM_DEFAULT_PARALLEL_AST_LIMIT 1024
79 * LDLM non-error return states
84 ELDLM_LOCK_CHANGED = 300,
85 ELDLM_LOCK_ABORTED = 301,
86 ELDLM_LOCK_REPLACED = 302,
87 ELDLM_NO_LOCK_DATA = 303,
88 ELDLM_LOCK_WOULDBLOCK = 304,
90 ELDLM_NAMESPACE_EXISTS = 400,
91 ELDLM_BAD_NAMESPACE = 401
95 * LDLM namespace type.
96 * The "client" type is actually an indication that this is a narrow local view
97 * into complete namespace on the server. Such namespaces cannot make any
98 * decisions about lack of conflicts or do any autonomous lock granting without
99 * first speaking to a server.
102 LDLM_NAMESPACE_SERVER = 1 << 0,
103 LDLM_NAMESPACE_CLIENT = 1 << 1
107 * The blocking callback is overloaded to perform two functions. These flags
108 * indicate which operation should be performed.
110 #define LDLM_CB_BLOCKING 1
111 #define LDLM_CB_CANCELING 2
114 * \name Lock Compatibility Matrix.
116 * A lock has both a type (extent, flock, inode bits, or plain) and a mode.
117 * Lock types are described in their respective implementation files:
118 * ldlm_{extent,flock,inodebits,plain}.c.
120 * There are six lock modes along with a compatibility matrix to indicate if
121 * two locks are compatible.
123 * - EX: Exclusive mode. Before a new file is created, MDS requests EX lock
125 * - PW: Protective Write (normal write) mode. When a client requests a write
126 * lock from an OST, a lock with PW mode will be issued.
127 * - PR: Protective Read (normal read) mode. When a client requests a read from
128 * an OST, a lock with PR mode will be issued. Also, if the client opens a
129 * file for execution, it is granted a lock with PR mode.
130 * - CW: Concurrent Write mode. The type of lock that the MDS grants if a client
131 * requests a write lock during a file open operation.
132 * - CR Concurrent Read mode. When a client performs a path lookup, MDS grants
133 * an inodebit lock with the CR mode on the intermediate path component.
147 #define LCK_COMPAT_EX LCK_NL
148 #define LCK_COMPAT_PW (LCK_COMPAT_EX | LCK_CR)
149 #define LCK_COMPAT_PR (LCK_COMPAT_PW | LCK_PR)
150 #define LCK_COMPAT_CW (LCK_COMPAT_PW | LCK_CW)
151 #define LCK_COMPAT_CR (LCK_COMPAT_CW | LCK_PR | LCK_PW)
152 #define LCK_COMPAT_NL (LCK_COMPAT_CR | LCK_EX | LCK_GROUP)
153 #define LCK_COMPAT_GROUP (LCK_GROUP | LCK_NL)
154 #define LCK_COMPAT_COS (LCK_COS)
155 /** @} Lock Compatibility Matrix */
157 extern ldlm_mode_t lck_compat_array[];
159 static inline void lockmode_verify(ldlm_mode_t mode)
161 LASSERT(mode > LCK_MINMODE && mode < LCK_MAXMODE);
164 static inline int lockmode_compat(ldlm_mode_t exist_mode, ldlm_mode_t new_mode)
166 return (lck_compat_array[exist_mode] & new_mode);
171 * cluster name spaces
175 #define DLM_OST_NAMESPACE 1
176 #define DLM_MDS_NAMESPACE 2
179 - do we just separate this by security domains and use a prefix for
180 multiple namespaces in the same domain?
185 * Locking rules for LDLM:
190 * waiting_locks_spinlock
205 struct ldlm_resource;
206 struct ldlm_namespace;
209 * Operations on LDLM pools.
210 * LDLM pool is a pool of locks in the namespace without any implicitly
212 * Locks in the pool are organized in LRU.
213 * Local memory pressure or server instructions (e.g. mempressure on server)
214 * can trigger freeing of locks from the pool
216 struct ldlm_pool_ops {
217 /** Recalculate pool \a pl usage */
218 int (*po_recalc)(struct ldlm_pool *pl);
219 /** Cancel at least \a nr locks from pool \a pl */
220 int (*po_shrink)(struct ldlm_pool *pl, int nr,
221 unsigned int gfp_mask);
222 int (*po_setup)(struct ldlm_pool *pl, int limit);
225 /** One second for pools thread check interval. Each pool has own period. */
226 #define LDLM_POOLS_THREAD_PERIOD (1)
228 /** ~6% margin for modest pools. See ldlm_pool.c for details. */
229 #define LDLM_POOLS_MODEST_MARGIN_SHIFT (4)
231 /** Default recalc period for server side pools in sec. */
232 #define LDLM_POOL_SRV_DEF_RECALC_PERIOD (1)
234 /** Default recalc period for client side pools in sec. */
235 #define LDLM_POOL_CLI_DEF_RECALC_PERIOD (10)
238 * LDLM pool structure to track granted locks.
239 * For purposes of determining when to release locks on e.g. memory pressure.
240 * This feature is commonly referred to as lru_resize.
243 /** Pool proc directory. */
244 struct proc_dir_entry *pl_proc_dir;
245 /** Pool name, must be long enough to hold compound proc entry name. */
247 /** Lock for protecting SLV/CLV updates. */
249 /** Number of allowed locks in in pool, both, client and server side. */
251 /** Number of granted locks in */
253 /** Grant rate per T. */
254 atomic_t pl_grant_rate;
255 /** Cancel rate per T. */
256 atomic_t pl_cancel_rate;
257 /** Server lock volume (SLV). Protected by pl_lock. */
258 __u64 pl_server_lock_volume;
259 /** Current biggest client lock volume. Protected by pl_lock. */
260 __u64 pl_client_lock_volume;
261 /** Lock volume factor. SLV on client is calculated as following:
262 * server_slv * lock_volume_factor. */
263 atomic_t pl_lock_volume_factor;
264 /** Time when last SLV from server was obtained. */
265 time_t pl_recalc_time;
266 /** Recalculation period for pool. */
267 time_t pl_recalc_period;
268 /** Recalculation and shrink operations. */
269 struct ldlm_pool_ops *pl_ops;
270 /** Number of planned locks for next period. */
272 /** Pool statistics. */
273 struct lprocfs_stats *pl_stats;
276 typedef int (*ldlm_res_policy)(struct ldlm_namespace *, struct ldlm_lock **,
277 void *req_cookie, ldlm_mode_t mode, __u64 flags,
280 typedef int (*ldlm_cancel_cbt)(struct ldlm_lock *lock);
284 * LVB is Lock Value Block. This is a special opaque (to LDLM) value that could
285 * be associated with an LDLM lock and transferred from client to server and
288 * Currently LVBs are used by:
289 * - OSC-OST code to maintain current object size/times
290 * - layout lock code to return the layout when the layout lock is granted
292 struct ldlm_valblock_ops {
293 int (*lvbo_init)(struct ldlm_resource *res);
294 int (*lvbo_update)(struct ldlm_resource *res,
295 struct ptlrpc_request *r,
297 int (*lvbo_free)(struct ldlm_resource *res);
298 /* Return size of lvb data appropriate RPC size can be reserved */
299 int (*lvbo_size)(struct ldlm_lock *lock);
300 /* Called to fill in lvb data to RPC buffer @buf */
301 int (*lvbo_fill)(struct ldlm_lock *lock, void *buf, int buflen);
305 * LDLM pools related, type of lock pool in the namespace.
306 * Greedy means release cached locks aggressively
309 LDLM_NAMESPACE_GREEDY = 1 << 0,
310 LDLM_NAMESPACE_MODEST = 1 << 1
314 * Default values for the "max_nolock_size", "contention_time" and
315 * "contended_locks" namespace tunables.
317 #define NS_DEFAULT_MAX_NOLOCK_BYTES 0
318 #define NS_DEFAULT_CONTENTION_SECONDS 2
319 #define NS_DEFAULT_CONTENDED_LOCKS 32
321 struct ldlm_ns_bucket {
322 /** back pointer to namespace */
323 struct ldlm_namespace *nsb_namespace;
325 * Estimated lock callback time. Used by adaptive timeout code to
326 * avoid spurious client evictions due to unresponsiveness when in
327 * fact the network or overall system load is at fault
329 struct adaptive_timeout nsb_at_estimate;
333 /** LDLM namespace lock stats */
340 LDLM_NS_TYPE_UNKNOWN = 0,
358 * Namespace serves to contain locks related to a particular service.
359 * There are two kinds of namespaces:
360 * - Server namespace has knowledge of all locks and is therefore authoritative
361 * to make decisions like what locks could be granted and what conflicts
362 * exist during new lock enqueue.
363 * - Client namespace only has limited knowledge about locks in the namespace,
364 * only seeing locks held by the client.
366 * Every Lustre service has one server namespace present on the server serving
367 * that service. Every client connected to the service has a client namespace
369 * Every lock obtained by client in that namespace is actually represented by
370 * two in-memory locks. One on the server and one on the client. The locks are
371 * linked by a special cookie by which one node can tell to the other which lock
372 * it actually means during communications. Such locks are called remote locks.
373 * The locks held by server only without any reference to a client are called
376 struct ldlm_namespace {
377 /** Backward link to OBD, required for LDLM pool to store new SLV. */
378 struct obd_device *ns_obd;
380 /** Flag indicating if namespace is on client instead of server */
381 ldlm_side_t ns_client;
383 /** Resource hash table for namespace. */
384 cfs_hash_t *ns_rs_hash;
389 /** big refcount (by bucket) */
393 * Namespace connect flags supported by server (may be changed via
394 * /proc, LRU resize may be disabled/enabled).
396 __u64 ns_connect_flags;
398 /** Client side original connect flags supported by server. */
399 __u64 ns_orig_connect_flags;
401 /* namespace proc dir entry */
402 struct proc_dir_entry *ns_proc_dir_entry;
405 * Position in global namespace list linking all namespaces on
408 struct list_head ns_list_chain;
411 * List of unused locks for this namespace. This list is also called
413 * Unused locks are locks with zero reader/writer reference counts.
414 * This list is only used on clients for lock caching purposes.
415 * When we want to release some locks voluntarily or if server wants
416 * us to release some locks due to e.g. memory pressure, we take locks
417 * to release from the head of this list.
418 * Locks are linked via l_lru field in \see struct ldlm_lock.
420 struct list_head ns_unused_list;
421 /** Number of locks in the LRU list above */
425 * Maximum number of locks permitted in the LRU. If 0, means locks
426 * are managed by pools and there is no preset limit, rather it is all
427 * controlled by available memory on this client and on server.
429 unsigned int ns_max_unused;
430 /** Maximum allowed age (last used time) for locks in the LRU */
431 unsigned int ns_max_age;
433 * Server only: number of times we evicted clients due to lack of reply
436 unsigned int ns_timeouts;
438 * Number of seconds since the file change time after which the
439 * MDT will return an UPDATE lock along with a LOOKUP lock.
440 * This allows the client to start caching negative dentries
441 * for a directory and may save an RPC for a later stat.
443 unsigned int ns_ctime_age_limit;
446 * Used to rate-limit ldlm_namespace_dump calls.
447 * \see ldlm_namespace_dump. Increased by 10 seconds every time
450 cfs_time_t ns_next_dump;
452 /** "policy" function that does actual lock conflict determination */
453 ldlm_res_policy ns_policy;
456 * LVB operations for this namespace.
457 * \see struct ldlm_valblock_ops
459 struct ldlm_valblock_ops *ns_lvbo;
462 * Used by filter code to store pointer to OBD of the service.
463 * Should be dropped in favor of \a ns_obd
468 * Wait queue used by __ldlm_namespace_free. Gets woken up every time
469 * a resource is removed.
471 wait_queue_head_t ns_waitq;
472 /** LDLM pool structure for this namespace */
473 struct ldlm_pool ns_pool;
474 /** Definition of how eagerly unused locks will be released from LRU */
475 ldlm_appetite_t ns_appetite;
478 * If more than \a ns_contended_locks are found, the resource is
479 * considered to be contended. Lock enqueues might specify that no
480 * contended locks should be granted
482 unsigned ns_contended_locks;
485 * The resources in this namespace remember contended state during
486 * \a ns_contention_time, in seconds.
488 unsigned ns_contention_time;
491 * Limit size of contended extent locks, in bytes.
492 * If extended lock is requested for more then this many bytes and
493 * caller instructs us not to grant contended locks, we would disregard
496 unsigned ns_max_nolock_size;
498 /** Limit of parallel AST RPC count. */
499 unsigned ns_max_parallel_ast;
502 * Callback to check if a lock is good to be canceled by ELC or
505 ldlm_cancel_cbt ns_cancel;
507 /** LDLM lock stats */
508 struct lprocfs_stats *ns_stats;
511 * Flag to indicate namespace is being freed. Used to determine if
512 * recalculation of LDLM pool statistics should be skipped.
514 unsigned ns_stopping:1;
518 * Returns 1 if namespace \a ns is a client namespace.
520 static inline int ns_is_client(struct ldlm_namespace *ns)
523 LASSERT(!(ns->ns_client & ~(LDLM_NAMESPACE_CLIENT |
524 LDLM_NAMESPACE_SERVER)));
525 LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT ||
526 ns->ns_client == LDLM_NAMESPACE_SERVER);
527 return ns->ns_client == LDLM_NAMESPACE_CLIENT;
531 * Returns 1 if namespace \a ns is a server namespace.
533 static inline int ns_is_server(struct ldlm_namespace *ns)
536 LASSERT(!(ns->ns_client & ~(LDLM_NAMESPACE_CLIENT |
537 LDLM_NAMESPACE_SERVER)));
538 LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT ||
539 ns->ns_client == LDLM_NAMESPACE_SERVER);
540 return ns->ns_client == LDLM_NAMESPACE_SERVER;
544 * Returns 1 if namespace \a ns supports early lock cancel (ELC).
546 static inline int ns_connect_cancelset(struct ldlm_namespace *ns)
549 return !!(ns->ns_connect_flags & OBD_CONNECT_CANCELSET);
553 * Returns 1 if this namespace supports lru_resize.
555 static inline int ns_connect_lru_resize(struct ldlm_namespace *ns)
558 return !!(ns->ns_connect_flags & OBD_CONNECT_LRU_RESIZE);
561 static inline void ns_register_cancel(struct ldlm_namespace *ns,
570 /** Type for blocking callback function of a lock. */
571 typedef int (*ldlm_blocking_callback)(struct ldlm_lock *lock,
572 struct ldlm_lock_desc *new, void *data,
574 /** Type for completion callback function of a lock. */
575 typedef int (*ldlm_completion_callback)(struct ldlm_lock *lock, __u64 flags,
577 /** Type for glimpse callback function of a lock. */
578 typedef int (*ldlm_glimpse_callback)(struct ldlm_lock *lock, void *data);
580 /** Work list for sending GL ASTs to multiple locks. */
581 struct ldlm_glimpse_work {
582 struct ldlm_lock *gl_lock; /* lock to glimpse */
583 struct list_head gl_list; /* linkage to other gl work structs */
584 __u32 gl_flags;/* see LDLM_GL_WORK_* below */
585 union ldlm_gl_desc *gl_desc; /* glimpse descriptor to be packed in
586 * glimpse callback request */
589 /** The ldlm_glimpse_work is allocated on the stack and should not be freed. */
590 #define LDLM_GL_WORK_NOFREE 0x1
592 /** Interval node data for each LDLM_EXTENT lock. */
593 struct ldlm_interval {
594 struct interval_node li_node; /* node for tree management */
595 struct list_head li_group; /* the locks which have the same
596 * policy - group of the policy */
598 #define to_ldlm_interval(n) container_of(n, struct ldlm_interval, li_node)
601 * Interval tree for extent locks.
602 * The interval tree must be accessed under the resource lock.
603 * Interval trees are used for granted extent locks to speed up conflicts
604 * lookup. See ldlm/interval_tree.c for more details.
606 struct ldlm_interval_tree {
609 ldlm_mode_t lit_mode; /* lock mode */
610 struct interval_node *lit_root; /* actual ldlm_interval */
613 /** Whether to track references to exports by LDLM locks. */
614 #define LUSTRE_TRACKS_LOCK_EXP_REFS (0)
618 LCF_ASYNC = 0x1, /* Cancel locks asynchronously. */
619 LCF_LOCAL = 0x2, /* Cancel locks locally, not notifing server */
620 LCF_BL_AST = 0x4, /* Cancel locks marked as LDLM_FL_BL_AST
622 } ldlm_cancel_flags_t;
628 __u64 blocking_owner;
629 struct obd_export *blocking_export;
630 /* Protected by the hash lock */
635 union ldlm_policy_data {
636 struct ldlm_extent l_extent;
637 struct ldlm_flock l_flock;
638 struct ldlm_inodebits l_inodebits;
641 typedef union ldlm_policy_data ldlm_policy_data_t;
643 void ldlm_convert_policy_to_wire(ldlm_type_t type,
644 const ldlm_policy_data_t *lpolicy,
645 ldlm_wire_policy_data_t *wpolicy);
646 void ldlm_convert_policy_to_local(struct obd_export *exp, ldlm_type_t type,
647 const ldlm_wire_policy_data_t *wpolicy,
648 ldlm_policy_data_t *lpolicy);
658 * LDLM lock structure
660 * Represents a single LDLM lock and its state in memory. Each lock is
661 * associated with a single ldlm_resource, the object which is being
662 * locked. There may be multiple ldlm_locks on a single resource,
663 * depending on the lock type and whether the locks are conflicting or
669 * When remote side wants to tell us about a lock, they address
670 * it by this opaque handle. The handle does not hold a
671 * reference on the ldlm_lock, so it can be safely passed to
672 * other threads or nodes. When the lock needs to be accessed
673 * from the handle, it is looked up again in the lock table, and
674 * may no longer exist.
676 * Must be first in the structure.
678 struct portals_handle l_handle;
680 * Lock reference count.
681 * This is how many users have pointers to actual structure, so that
682 * we do not accidentally free lock structure that is in use.
686 * Internal spinlock protects l_resource. We should hold this lock
687 * first before taking res_lock.
691 * Pointer to actual resource this lock is in.
692 * ldlm_lock_change_resource() can change this.
694 struct ldlm_resource *l_resource;
696 * List item for client side LRU list.
697 * Protected by ns_lock in struct ldlm_namespace.
699 struct list_head l_lru;
701 * Linkage to resource's lock queues according to current lock state.
702 * (could be granted, waiting or converting)
703 * Protected by lr_lock in struct ldlm_resource.
705 struct list_head l_res_link;
707 * Tree node for ldlm_extent.
709 struct ldlm_interval *l_tree_node;
711 * Per export hash of locks.
712 * Protected by per-bucket exp->exp_lock_hash locks.
714 struct hlist_node l_exp_hash;
716 * Per export hash of flock locks.
717 * Protected by per-bucket exp->exp_flock_hash locks.
719 struct hlist_node l_exp_flock_hash;
722 * Protected by lr_lock.
724 ldlm_mode_t l_req_mode;
726 * Granted mode, also protected by lr_lock.
728 ldlm_mode_t l_granted_mode;
729 /** Lock completion handler pointer. Called when lock is granted. */
730 ldlm_completion_callback l_completion_ast;
732 * Lock blocking AST handler pointer.
733 * It plays two roles:
734 * - as a notification of an attempt to queue a conflicting lock (once)
735 * - as a notification when the lock is being cancelled.
737 * As such it's typically called twice: once for the initial conflict
738 * and then once more when the last user went away and the lock is
739 * cancelled (could happen recursively).
741 ldlm_blocking_callback l_blocking_ast;
743 * Lock glimpse handler.
744 * Glimpse handler is used to obtain LVB updates from a client by
747 ldlm_glimpse_callback l_glimpse_ast;
751 * This is a pointer to actual client export for locks that were granted
752 * to clients. Used server-side.
754 struct obd_export *l_export;
756 * Lock connection export.
757 * Pointer to server export on a client.
759 struct obd_export *l_conn_export;
762 * Remote lock handle.
763 * If the lock is remote, this is the handle of the other side lock
766 struct lustre_handle l_remote_handle;
769 * Representation of private data specific for a lock type.
770 * Examples are: extent range for extent lock or bitmask for ibits locks
772 ldlm_policy_data_t l_policy_data;
775 * Lock state flags. Protected by lr_lock.
776 * \see lustre_dlm_flags.h where the bits are defined.
781 * Lock r/w usage counters.
782 * Protected by lr_lock.
787 * If the lock is granted, a process sleeps on this waitq to learn when
788 * it's no longer in use. If the lock is not granted, a process sleeps
789 * on this waitq to learn when it becomes granted.
791 wait_queue_head_t l_waitq;
794 * Seconds. It will be updated if there is any activity related to
795 * the lock, e.g. enqueue the lock or send blocking AST.
797 cfs_time_t l_last_activity;
800 * Time last used by e.g. being matched by lock match.
801 * Jiffies. Should be converted to time if needed.
803 cfs_time_t l_last_used;
805 /** Originally requested extent for the extent lock. */
806 struct ldlm_extent l_req_extent;
809 * Client-side-only members.
812 enum lvb_type l_lvb_type;
815 * Temporary storage for a LVB received during an enqueue operation.
820 /** Private storage for lock user. Opaque to LDLM. */
824 * Server-side-only members.
828 * Connection cookie for the client originating the operation.
829 * Used by Commit on Share (COS) code. Currently only used for
830 * inodebits locks on MDS.
832 __u64 l_client_cookie;
835 * List item for locks waiting for cancellation from clients.
836 * The lists this could be linked into are:
837 * waiting_locks_list (protected by waiting_locks_spinlock),
838 * then if the lock timed out, it is moved to
839 * expired_lock_thread.elt_expired_locks for further processing.
840 * Protected by elt_lock.
842 struct list_head l_pending_chain;
845 * Set when lock is sent a blocking AST. Time in seconds when timeout
846 * is reached and client holding this lock could be evicted.
847 * This timeout could be further extended by e.g. certain IO activity
849 * \see ost_rw_prolong_locks
851 cfs_time_t l_callback_timeout;
853 /** Local PID of process which created this lock. */
857 * Number of times blocking AST was sent for this lock.
858 * This is for debugging. Valid values are 0 and 1, if there is an
859 * attempt to send blocking AST more than once, an assertion would be
860 * hit. \see ldlm_work_bl_ast_lock
863 /** List item ldlm_add_ast_work_item() for case of blocking ASTs. */
864 struct list_head l_bl_ast;
865 /** List item ldlm_add_ast_work_item() for case of completion ASTs. */
866 struct list_head l_cp_ast;
867 /** For ldlm_add_ast_work_item() for "revoke" AST used in COS. */
868 struct list_head l_rk_ast;
871 * Pointer to a conflicting lock that caused blocking AST to be sent
874 struct ldlm_lock *l_blocking_lock;
877 * Protected by lr_lock, linkages to "skip lists".
878 * For more explanations of skip lists see ldlm/ldlm_inodebits.c
880 struct list_head l_sl_mode;
881 struct list_head l_sl_policy;
883 /** Reference tracking structure to debug leaked locks. */
884 struct lu_ref l_reference;
885 #if LUSTRE_TRACKS_LOCK_EXP_REFS
886 /* Debugging stuff for bug 20498, for tracking export references. */
887 /** number of export references taken */
889 /** link all locks referencing one export */
890 struct list_head l_exp_refs_link;
891 /** referenced export object */
892 struct obd_export *l_exp_refs_target;
895 * export blocking dlm lock list, protected by
896 * l_export->exp_bl_list_lock.
897 * Lock order of waiting_lists_spinlock, exp_bl_list_lock and res lock
898 * is: res lock -> exp_bl_list_lock -> wanting_lists_spinlock.
900 struct list_head l_exp_list;
904 * LDLM resource description.
905 * Basically, resource is a representation for a single object.
906 * Object has a name which is currently 4 64-bit integers. LDLM user is
907 * responsible for creation of a mapping between objects it wants to be
908 * protected and resource names.
910 * A resource can only hold locks of a single lock type, though there may be
911 * multiple ldlm_locks on a single resource, depending on the lock type and
912 * whether the locks are conflicting or not.
914 struct ldlm_resource {
915 struct ldlm_ns_bucket *lr_ns_bucket;
918 * List item for list in namespace hash.
919 * protected by ns_lock
921 struct hlist_node lr_hash;
923 /** Spinlock to protect locks under this resource. */
927 * protected by lr_lock
929 /** List of locks in granted state */
930 struct list_head lr_granted;
931 /** List of locks waiting to change their granted mode (converted) */
932 struct list_head lr_converting;
934 * List of locks that could not be granted due to conflicts and
935 * that are waiting for conflicts to go away */
936 struct list_head lr_waiting;
939 /* XXX No longer needed? Remove ASAP */
940 ldlm_mode_t lr_most_restr;
942 /** Type of locks this resource can hold. Only one type per resource. */
943 ldlm_type_t lr_type; /* LDLM_{PLAIN,EXTENT,FLOCK,IBITS} */
946 struct ldlm_res_id lr_name;
947 /** Reference count for this resource */
948 atomic_t lr_refcount;
951 * Interval trees (only for extent locks) for all modes of this resource
953 struct ldlm_interval_tree lr_itree[LCK_MODE_NUM];
956 * Server-side-only lock value block elements.
957 * To serialize lvbo_init.
959 struct mutex lr_lvb_mutex;
961 /** protected by lr_lock */
964 /** When the resource was considered as contended. */
965 cfs_time_t lr_contention_time;
966 /** List of references to this resource. For debugging. */
967 struct lu_ref lr_reference;
969 struct inode *lr_lvb_inode;
972 static inline bool ldlm_has_layout(struct ldlm_lock *lock)
974 return lock->l_resource->lr_type == LDLM_IBITS &&
975 lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_LAYOUT;
979 ldlm_ns_name(struct ldlm_namespace *ns)
981 return ns->ns_rs_hash->hs_name;
984 static inline struct ldlm_namespace *
985 ldlm_res_to_ns(struct ldlm_resource *res)
987 return res->lr_ns_bucket->nsb_namespace;
990 static inline struct ldlm_namespace *
991 ldlm_lock_to_ns(struct ldlm_lock *lock)
993 return ldlm_res_to_ns(lock->l_resource);
997 ldlm_lock_to_ns_name(struct ldlm_lock *lock)
999 return ldlm_ns_name(ldlm_lock_to_ns(lock));
1002 static inline struct adaptive_timeout *
1003 ldlm_lock_to_ns_at(struct ldlm_lock *lock)
1005 return &lock->l_resource->lr_ns_bucket->nsb_at_estimate;
1008 static inline int ldlm_lvbo_init(struct ldlm_resource *res)
1010 struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1012 if (ns->ns_lvbo != NULL && ns->ns_lvbo->lvbo_init != NULL)
1013 return ns->ns_lvbo->lvbo_init(res);
1018 static inline int ldlm_lvbo_size(struct ldlm_lock *lock)
1020 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
1022 if (ns->ns_lvbo != NULL && ns->ns_lvbo->lvbo_size != NULL)
1023 return ns->ns_lvbo->lvbo_size(lock);
1028 static inline int ldlm_lvbo_fill(struct ldlm_lock *lock, void *buf, int len)
1030 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
1032 if (ns->ns_lvbo != NULL) {
1033 LASSERT(ns->ns_lvbo->lvbo_fill != NULL);
1034 return ns->ns_lvbo->lvbo_fill(lock, buf, len);
1039 struct ldlm_ast_work {
1040 struct ldlm_lock *w_lock;
1042 struct ldlm_lock_desc w_desc;
1043 struct list_head w_list;
1050 * Common ldlm_enqueue parameters
1052 struct ldlm_enqueue_info {
1053 __u32 ei_type; /** Type of the lock being enqueued. */
1054 __u32 ei_mode; /** Mode of the lock being enqueued. */
1055 void *ei_cb_bl; /** blocking lock callback */
1056 void *ei_cb_cp; /** lock completion callback */
1057 void *ei_cb_gl; /** lock glimpse callback */
1058 void *ei_cbdata; /** Data to be passed into callbacks. */
1059 unsigned int ei_enq_slave:1; /* whether enqueue slave stripes */
1062 #define ei_res_id ei_cb_gl
1064 extern struct obd_ops ldlm_obd_ops;
1066 extern char *ldlm_lockname[];
1067 extern char *ldlm_typename[];
1068 extern char *ldlm_it2str(int it);
1071 * Just a fancy CDEBUG call with log level preset to LDLM_DEBUG.
1072 * For the cases where we do not have actual lock to print along
1073 * with a debugging message that is ldlm-related
1075 #define LDLM_DEBUG_NOLOCK(format, a...) \
1076 CDEBUG(D_DLMTRACE, "### " format "\n" , ##a)
1079 * Support function for lock information printing into debug logs.
1083 #define ldlm_lock_debug(msgdata, mask, cdls, lock, fmt, a...) do { \
1084 CFS_CHECK_STACK(msgdata, mask, cdls); \
1086 if (((mask) & D_CANTMASK) != 0 || \
1087 ((libcfs_debug & (mask)) != 0 && \
1088 (libcfs_subsystem_debug & DEBUG_SUBSYSTEM) != 0)) \
1089 _ldlm_lock_debug(lock, msgdata, fmt, ##a); \
1092 void _ldlm_lock_debug(struct ldlm_lock *lock,
1093 struct libcfs_debug_msg_data *data,
1094 const char *fmt, ...)
1095 __attribute__ ((format (printf, 3, 4)));
1098 * Rate-limited version of lock printing function.
1100 #define LDLM_DEBUG_LIMIT(mask, lock, fmt, a...) do { \
1101 static cfs_debug_limit_state_t _ldlm_cdls; \
1102 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, mask, &_ldlm_cdls); \
1103 ldlm_lock_debug(&msgdata, mask, &_ldlm_cdls, lock, "### " fmt , ##a);\
1106 #define LDLM_ERROR(lock, fmt, a...) LDLM_DEBUG_LIMIT(D_ERROR, lock, fmt, ## a)
1107 #define LDLM_WARN(lock, fmt, a...) LDLM_DEBUG_LIMIT(D_WARNING, lock, fmt, ## a)
1109 /** Non-rate-limited lock printing function for debugging purposes. */
1110 #define LDLM_DEBUG(lock, fmt, a...) do { \
1111 if (likely(lock != NULL)) { \
1112 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_DLMTRACE, NULL); \
1113 ldlm_lock_debug(&msgdata, D_DLMTRACE, NULL, lock, \
1114 "### " fmt , ##a); \
1116 LDLM_DEBUG_NOLOCK("no dlm lock: " fmt, ##a); \
1119 #else /* !LIBCFS_DEBUG */
1120 # define LDLM_DEBUG_LIMIT(mask, lock, fmt, a...) ((void)0)
1121 # define LDLM_DEBUG(lock, fmt, a...) ((void)0)
1122 # define LDLM_ERROR(lock, fmt, a...) ((void)0)
1125 typedef int (*ldlm_processing_policy)(struct ldlm_lock *lock, __u64 *flags,
1126 int first_enq, ldlm_error_t *err,
1127 struct list_head *work_list);
1130 * Return values for lock iterators.
1131 * Also used during deciding of lock grants and cancellations.
1133 #define LDLM_ITER_CONTINUE 1 /* keep iterating */
1134 #define LDLM_ITER_STOP 2 /* stop iterating */
1136 typedef int (*ldlm_iterator_t)(struct ldlm_lock *, void *);
1137 typedef int (*ldlm_res_iterator_t)(struct ldlm_resource *, void *);
1139 /** \defgroup ldlm_iterator Lock iterators
1141 * LDLM provides for a way to iterate through every lock on a resource or
1142 * namespace or every resource in a namespace.
1144 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
1146 void ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
1148 int ldlm_resource_iterate(struct ldlm_namespace *, const struct ldlm_res_id *,
1149 ldlm_iterator_t iter, void *data);
1150 /** @} ldlm_iterator */
1152 int ldlm_replay_locks(struct obd_import *imp);
1155 int ldlm_flock_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data);
1158 __u64 ldlm_extent_shift_kms(struct ldlm_lock *lock, __u64 old_kms);
1160 struct ldlm_callback_suite {
1161 ldlm_completion_callback lcs_completion;
1162 ldlm_blocking_callback lcs_blocking;
1163 ldlm_glimpse_callback lcs_glimpse;
1167 #ifdef HAVE_SERVER_SUPPORT
1168 /** \defgroup ldlm_srv_ast Server AST handlers
1169 * These are AST handlers used by server code.
1170 * Their property is that they are just preparing RPCs to be sent to clients.
1173 int ldlm_server_blocking_ast(struct ldlm_lock *, struct ldlm_lock_desc *,
1174 void *data, int flag);
1175 int ldlm_server_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data);
1176 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data);
1177 int ldlm_glimpse_locks(struct ldlm_resource *res,
1178 struct list_head *gl_work_list);
1179 /** @} ldlm_srv_ast */
1181 /** \defgroup ldlm_handlers Server LDLM handlers
1182 * These are handler functions that should be called by "frontends" such as
1183 * MDT or OST to pass through LDLM requests to LDLM for handling
1186 int ldlm_handle_enqueue(struct ptlrpc_request *req, ldlm_completion_callback,
1187 ldlm_blocking_callback, ldlm_glimpse_callback);
1188 int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req,
1189 const struct ldlm_request *dlm_req,
1190 const struct ldlm_callback_suite *cbs);
1191 int ldlm_handle_convert(struct ptlrpc_request *req);
1192 int ldlm_handle_convert0(struct ptlrpc_request *req,
1193 const struct ldlm_request *dlm_req);
1194 int ldlm_handle_cancel(struct ptlrpc_request *req);
1195 int ldlm_request_cancel(struct ptlrpc_request *req,
1196 const struct ldlm_request *dlm_req, int first);
1197 /** @} ldlm_handlers */
1199 void ldlm_revoke_export_locks(struct obd_export *exp);
1201 int ldlm_del_waiting_lock(struct ldlm_lock *lock);
1202 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout);
1203 int ldlm_get_ref(void);
1204 void ldlm_put_ref(void);
1205 int ldlm_init_export(struct obd_export *exp);
1206 void ldlm_destroy_export(struct obd_export *exp);
1207 struct ldlm_lock *ldlm_request_lock(struct ptlrpc_request *req);
1210 #ifdef HAVE_SERVER_SUPPORT
1211 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res);
1213 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg);
1214 void ldlm_lock2handle(const struct ldlm_lock *lock,
1215 struct lustre_handle *lockh);
1216 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *, __u64 flags);
1217 void ldlm_cancel_callback(struct ldlm_lock *);
1218 int ldlm_lock_remove_from_lru(struct ldlm_lock *);
1219 int ldlm_lock_set_data(struct lustre_handle *, void *);
1222 * Obtain a lock reference by its handle.
1224 static inline struct ldlm_lock *ldlm_handle2lock(const struct lustre_handle *h)
1226 return __ldlm_handle2lock(h, 0);
1229 #define LDLM_LOCK_REF_DEL(lock) \
1230 lu_ref_del(&lock->l_reference, "handle", current)
1232 static inline struct ldlm_lock *
1233 ldlm_handle2lock_long(const struct lustre_handle *h, __u64 flags)
1235 struct ldlm_lock *lock;
1237 lock = __ldlm_handle2lock(h, flags);
1239 LDLM_LOCK_REF_DEL(lock);
1244 * Update Lock Value Block Operations (LVBO) on a resource taking into account
1245 * data from reqest \a r
1247 static inline int ldlm_res_lvbo_update(struct ldlm_resource *res,
1248 struct ptlrpc_request *r, int increase)
1250 if (ldlm_res_to_ns(res)->ns_lvbo &&
1251 ldlm_res_to_ns(res)->ns_lvbo->lvbo_update) {
1252 return ldlm_res_to_ns(res)->ns_lvbo->lvbo_update(res, r,
1258 int ldlm_error2errno(ldlm_error_t error);
1259 ldlm_error_t ldlm_errno2error(int err_no); /* don't call it `errno': this
1260 * confuses user-space. */
1261 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1262 void ldlm_dump_export_locks(struct obd_export *exp);
1266 * Release a temporary lock reference obtained by ldlm_handle2lock() or
1267 * __ldlm_handle2lock().
1269 #define LDLM_LOCK_PUT(lock) \
1271 LDLM_LOCK_REF_DEL(lock); \
1272 /*LDLM_DEBUG((lock), "put");*/ \
1273 ldlm_lock_put(lock); \
1277 * Release a lock reference obtained by some other means (see
1280 #define LDLM_LOCK_RELEASE(lock) \
1282 /*LDLM_DEBUG((lock), "put");*/ \
1283 ldlm_lock_put(lock); \
1286 #define LDLM_LOCK_GET(lock) \
1288 ldlm_lock_get(lock); \
1289 /*LDLM_DEBUG((lock), "get");*/ \
1293 #define ldlm_lock_list_put(head, member, count) \
1295 struct ldlm_lock *_lock, *_next; \
1297 list_for_each_entry_safe(_lock, _next, head, member) { \
1300 list_del_init(&_lock->member); \
1301 LDLM_LOCK_RELEASE(_lock); \
1306 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
1307 void ldlm_lock_put(struct ldlm_lock *lock);
1308 void ldlm_lock_destroy(struct ldlm_lock *lock);
1309 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
1310 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode);
1311 int ldlm_lock_addref_try(struct lustre_handle *lockh, __u32 mode);
1312 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode);
1313 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode);
1314 void ldlm_lock_fail_match_locked(struct ldlm_lock *lock);
1315 void ldlm_lock_fail_match(struct ldlm_lock *lock);
1316 void ldlm_lock_allow_match(struct ldlm_lock *lock);
1317 void ldlm_lock_allow_match_locked(struct ldlm_lock *lock);
1318 ldlm_mode_t ldlm_lock_match(struct ldlm_namespace *ns, __u64 flags,
1319 const struct ldlm_res_id *, ldlm_type_t type,
1320 ldlm_policy_data_t *, ldlm_mode_t mode,
1321 struct lustre_handle *, int unref);
1322 ldlm_mode_t ldlm_revalidate_lock_handle(struct lustre_handle *lockh,
1324 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
1326 void ldlm_lock_downgrade(struct ldlm_lock *lock, int new_mode);
1327 void ldlm_lock_cancel(struct ldlm_lock *lock);
1328 void ldlm_reprocess_all(struct ldlm_resource *res);
1329 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns);
1330 void ldlm_lock_dump_handle(int level, struct lustre_handle *);
1331 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req);
1334 struct ldlm_namespace *
1335 ldlm_namespace_new(struct obd_device *obd, char *name,
1336 ldlm_side_t client, ldlm_appetite_t apt,
1337 ldlm_ns_type_t ns_type);
1338 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags);
1339 void ldlm_namespace_free(struct ldlm_namespace *ns,
1340 struct obd_import *imp, int force);
1341 void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client);
1342 void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client);
1343 void ldlm_namespace_get(struct ldlm_namespace *ns);
1344 void ldlm_namespace_put(struct ldlm_namespace *ns);
1345 int ldlm_proc_setup(void);
1347 void ldlm_proc_cleanup(void);
1349 static inline void ldlm_proc_cleanup(void) {}
1352 /* resource.c - internal */
1353 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
1354 struct ldlm_resource *parent,
1355 const struct ldlm_res_id *,
1356 ldlm_type_t type, int create);
1357 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
1358 int ldlm_resource_putref(struct ldlm_resource *res);
1359 void ldlm_resource_add_lock(struct ldlm_resource *res,
1360 struct list_head *head,
1361 struct ldlm_lock *lock);
1362 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
1363 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
1364 void ldlm_dump_all_namespaces(ldlm_side_t client, int level);
1365 void ldlm_namespace_dump(int level, struct ldlm_namespace *);
1366 void ldlm_resource_dump(int level, struct ldlm_resource *);
1367 int ldlm_lock_change_resource(struct ldlm_namespace *, struct ldlm_lock *,
1368 const struct ldlm_res_id *);
1370 #define LDLM_RESOURCE_ADDREF(res) do { \
1371 lu_ref_add_atomic(&(res)->lr_reference, __FUNCTION__, current); \
1374 #define LDLM_RESOURCE_DELREF(res) do { \
1375 lu_ref_del(&(res)->lr_reference, __FUNCTION__, current); \
1378 /* ldlm_request.c */
1379 int ldlm_expired_completion_wait(void *data);
1380 /** \defgroup ldlm_local_ast Default AST handlers for local locks
1381 * These AST handlers are typically used for server-side local locks and are
1382 * also used by client-side lock handlers to perform minimum level base
1385 int ldlm_blocking_ast_nocheck(struct ldlm_lock *lock);
1386 int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1387 void *data, int flag);
1388 int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp);
1389 int ldlm_completion_ast_async(struct ldlm_lock *lock, __u64 flags, void *data);
1390 int ldlm_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data);
1391 /** @} ldlm_local_ast */
1393 /** \defgroup ldlm_cli_api API to operate on locks from actual LDLM users.
1394 * These are typically used by client and server (*_local versions)
1395 * to obtain and release locks.
1397 int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
1398 struct ldlm_enqueue_info *einfo,
1399 const struct ldlm_res_id *res_id,
1400 ldlm_policy_data_t const *policy, __u64 *flags,
1401 void *lvb, __u32 lvb_len, enum lvb_type lvb_type,
1402 struct lustre_handle *lockh, int async);
1403 int ldlm_prep_enqueue_req(struct obd_export *exp,
1404 struct ptlrpc_request *req,
1405 struct list_head *cancels,
1407 int ldlm_prep_elc_req(struct obd_export *exp, struct ptlrpc_request *req,
1408 int version, int opc, int canceloff,
1409 struct list_head *cancels, int count);
1411 struct ptlrpc_request *ldlm_enqueue_pack(struct obd_export *exp, int lvb_len);
1412 int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req,
1413 const struct ldlm_request *dlm_req,
1414 const struct ldlm_callback_suite *cbs);
1415 int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
1416 ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode,
1417 __u64 *flags, void *lvb, __u32 lvb_len,
1418 struct lustre_handle *lockh, int rc);
1419 int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
1420 const struct ldlm_res_id *res_id,
1421 ldlm_type_t type, ldlm_policy_data_t *policy,
1422 ldlm_mode_t mode, __u64 *flags,
1423 ldlm_blocking_callback blocking,
1424 ldlm_completion_callback completion,
1425 ldlm_glimpse_callback glimpse,
1426 void *data, __u32 lvb_len, enum lvb_type lvb_type,
1427 const __u64 *client_cookie,
1428 struct lustre_handle *lockh);
1429 int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new,
1430 void *data, __u32 data_len);
1431 int ldlm_cli_convert(struct lustre_handle *, int new_mode, __u32 *flags);
1432 int ldlm_cli_update_pool(struct ptlrpc_request *req);
1433 int ldlm_cli_cancel(struct lustre_handle *lockh,
1434 ldlm_cancel_flags_t cancel_flags);
1435 int ldlm_cli_cancel_unused(struct ldlm_namespace *, const struct ldlm_res_id *,
1436 ldlm_cancel_flags_t flags, void *opaque);
1437 int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
1438 const struct ldlm_res_id *res_id,
1439 ldlm_policy_data_t *policy,
1441 ldlm_cancel_flags_t flags,
1443 int ldlm_cli_cancel_req(struct obd_export *exp, struct list_head *head,
1444 int count, ldlm_cancel_flags_t flags);
1445 int ldlm_cancel_resource_local(struct ldlm_resource *res,
1446 struct list_head *cancels,
1447 ldlm_policy_data_t *policy,
1448 ldlm_mode_t mode, __u64 lock_flags,
1449 ldlm_cancel_flags_t cancel_flags, void *opaque);
1450 int ldlm_cli_cancel_list_local(struct list_head *cancels, int count,
1451 ldlm_cancel_flags_t flags);
1452 int ldlm_cli_cancel_list(struct list_head *head, int count,
1453 struct ptlrpc_request *req, ldlm_cancel_flags_t flags);
1454 /** @} ldlm_cli_api */
1457 /* This has to be here because recursive inclusion sucks. */
1458 int intent_disposition(struct ldlm_reply *rep, int flag);
1459 void intent_set_disposition(struct ldlm_reply *rep, int flag);
1462 * "Modes" of acquiring lock_res, necessary to tell lockdep that taking more
1463 * than one lock_res is dead-lock safe.
1465 enum lock_res_type {
1470 /** Lock resource. */
1471 static inline void lock_res(struct ldlm_resource *res)
1473 spin_lock(&res->lr_lock);
1476 /** Lock resource with a way to instruct lockdep code about nestedness-safe. */
1477 static inline void lock_res_nested(struct ldlm_resource *res,
1478 enum lock_res_type mode)
1480 spin_lock_nested(&res->lr_lock, mode);
1483 /** Unlock resource. */
1484 static inline void unlock_res(struct ldlm_resource *res)
1486 spin_unlock(&res->lr_lock);
1489 /** Check if resource is already locked, assert if not. */
1490 static inline void check_res_locked(struct ldlm_resource *res)
1492 assert_spin_locked(&res->lr_lock);
1495 struct ldlm_resource * lock_res_and_lock(struct ldlm_lock *lock);
1496 void unlock_res_and_lock(struct ldlm_lock *lock);
1499 /** \defgroup ldlm_pools Various LDLM pool related functions
1500 * There are not used outside of ldlm.
1503 int ldlm_pools_recalc(ldlm_side_t client);
1504 int ldlm_pools_init(void);
1505 void ldlm_pools_fini(void);
1507 int ldlm_pool_init(struct ldlm_pool *pl, struct ldlm_namespace *ns,
1508 int idx, ldlm_side_t client);
1509 int ldlm_pool_shrink(struct ldlm_pool *pl, int nr,
1510 unsigned int gfp_mask);
1511 void ldlm_pool_fini(struct ldlm_pool *pl);
1512 int ldlm_pool_setup(struct ldlm_pool *pl, int limit);
1513 int ldlm_pool_recalc(struct ldlm_pool *pl);
1514 __u32 ldlm_pool_get_lvf(struct ldlm_pool *pl);
1515 __u64 ldlm_pool_get_slv(struct ldlm_pool *pl);
1516 __u64 ldlm_pool_get_clv(struct ldlm_pool *pl);
1517 __u32 ldlm_pool_get_limit(struct ldlm_pool *pl);
1518 void ldlm_pool_set_slv(struct ldlm_pool *pl, __u64 slv);
1519 void ldlm_pool_set_clv(struct ldlm_pool *pl, __u64 clv);
1520 void ldlm_pool_set_limit(struct ldlm_pool *pl, __u32 limit);
1521 void ldlm_pool_add(struct ldlm_pool *pl, struct ldlm_lock *lock);
1522 void ldlm_pool_del(struct ldlm_pool *pl, struct ldlm_lock *lock);