4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2010, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 /** \defgroup LDLM Lustre Distributed Lock Manager
35 * Lustre DLM is based on VAX DLM.
36 * Its two main roles are:
37 * - To provide locking assuring consistency of data on all Lustre nodes.
38 * - To allow clients to cache state protected by a lock by holding the
39 * lock until a conflicting lock is requested or it is expired by the LRU.
44 #ifndef _LUSTRE_DLM_H__
45 #define _LUSTRE_DLM_H__
47 #include <lustre_lib.h>
48 #include <lustre_net.h>
49 #include <lustre_import.h>
50 #include <lustre_handles.h>
51 #include <interval_tree.h> /* for interval_node{}, ldlm_extent */
54 #include "lustre_dlm_flags.h"
59 extern struct kset *ldlm_ns_kset;
60 extern struct kset *ldlm_svc_kset;
62 #define OBD_LDLM_DEVICENAME "ldlm"
64 #define LDLM_DEFAULT_LRU_SIZE (100 * num_online_cpus())
65 #define LDLM_DEFAULT_MAX_ALIVE 3900 /* 3900 seconds ~65 min */
66 #define LDLM_CTIME_AGE_LIMIT (10)
67 /* if client lock is unused for that time it can be cancelled if any other
68 * client shows interest in that lock, e.g. glimpse is occured. */
69 #define LDLM_DIRTY_AGE_LIMIT (10)
70 #define LDLM_DEFAULT_PARALLEL_AST_LIMIT 1024
73 * LDLM non-error return states
77 ELDLM_LOCK_MATCHED = 1,
79 ELDLM_LOCK_CHANGED = 300,
80 ELDLM_LOCK_ABORTED = 301,
81 ELDLM_LOCK_REPLACED = 302,
82 ELDLM_NO_LOCK_DATA = 303,
83 ELDLM_LOCK_WOULDBLOCK = 304,
85 ELDLM_NAMESPACE_EXISTS = 400,
86 ELDLM_BAD_NAMESPACE = 401,
90 * LDLM namespace type.
91 * The "client" type is actually an indication that this is a narrow local view
92 * into complete namespace on the server. Such namespaces cannot make any
93 * decisions about lack of conflicts or do any autonomous lock granting without
94 * first speaking to a server.
97 LDLM_NAMESPACE_SERVER = 0x01,
98 LDLM_NAMESPACE_CLIENT = 0x02
102 * The blocking callback is overloaded to perform two functions. These flags
103 * indicate which operation should be performed.
105 #define LDLM_CB_BLOCKING 1
106 #define LDLM_CB_CANCELING 2
109 * \name Lock Compatibility Matrix.
111 * A lock has both a type (extent, flock, inode bits, or plain) and a mode.
112 * Lock types are described in their respective implementation files:
113 * ldlm_{extent,flock,inodebits,plain}.c.
115 * There are six lock modes along with a compatibility matrix to indicate if
116 * two locks are compatible.
118 * - EX: Exclusive mode. Before a new file is created, MDS requests EX lock
120 * - PW: Protective Write (normal write) mode. When a client requests a write
121 * lock from an OST, a lock with PW mode will be issued.
122 * - PR: Protective Read (normal read) mode. When a client requests a read from
123 * an OST, a lock with PR mode will be issued. Also, if the client opens a
124 * file for execution, it is granted a lock with PR mode.
125 * - CW: Concurrent Write mode. The type of lock that the MDS grants if a client
126 * requests a write lock during a file open operation.
127 * - CR Concurrent Read mode. When a client performs a path lookup, MDS grants
128 * an inodebit lock with the CR mode on the intermediate path component.
142 #define LCK_COMPAT_EX LCK_NL
143 #define LCK_COMPAT_PW (LCK_COMPAT_EX | LCK_CR)
144 #define LCK_COMPAT_PR (LCK_COMPAT_PW | LCK_PR)
145 #define LCK_COMPAT_CW (LCK_COMPAT_PW | LCK_CW)
146 #define LCK_COMPAT_CR (LCK_COMPAT_CW | LCK_PR | LCK_PW)
147 #define LCK_COMPAT_NL (LCK_COMPAT_CR | LCK_EX | LCK_GROUP)
148 #define LCK_COMPAT_GROUP (LCK_GROUP | LCK_NL)
149 #define LCK_COMPAT_COS (LCK_COS)
150 /** @} Lock Compatibility Matrix */
152 extern enum ldlm_mode lck_compat_array[];
154 static inline void lockmode_verify(enum ldlm_mode mode)
156 LASSERT(mode > LCK_MINMODE && mode < LCK_MAXMODE);
159 static inline int lockmode_compat(enum ldlm_mode exist_mode,
160 enum ldlm_mode new_mode)
162 return lck_compat_array[exist_mode] & new_mode;
167 * cluster name spaces
171 #define DLM_OST_NAMESPACE 1
172 #define DLM_MDS_NAMESPACE 2
175 - do we just separate this by security domains and use a prefix for
176 multiple namespaces in the same domain?
181 * Locking rules for LDLM:
186 * waiting_locks_spinlock
201 struct ldlm_resource;
202 struct ldlm_namespace;
205 * Operations on LDLM pools.
206 * LDLM pool is a pool of locks in the namespace without any implicitly
208 * Locks in the pool are organized in LRU.
209 * Local memory pressure or server instructions (e.g. mempressure on server)
210 * can trigger freeing of locks from the pool
212 struct ldlm_pool_ops {
213 /** Recalculate pool \a pl usage */
214 int (*po_recalc)(struct ldlm_pool *pl);
215 /** Cancel at least \a nr locks from pool \a pl */
216 int (*po_shrink)(struct ldlm_pool *pl, int nr, gfp_t gfp_mask);
217 int (*po_setup)(struct ldlm_pool *pl, int limit);
220 /** One second for pools thread check interval. Each pool has own period. */
221 #define LDLM_POOLS_THREAD_PERIOD (1)
223 /** ~6% margin for modest pools. See ldlm_pool.c for details. */
224 #define LDLM_POOLS_MODEST_MARGIN_SHIFT (4)
226 /** Default recalc period for server side pools in sec. */
227 #define LDLM_POOL_SRV_DEF_RECALC_PERIOD (1)
229 /** Default recalc period for client side pools in sec. */
230 #define LDLM_POOL_CLI_DEF_RECALC_PERIOD (10)
233 * LDLM pool structure to track granted locks.
234 * For purposes of determining when to release locks on e.g. memory pressure.
235 * This feature is commonly referred to as lru_resize.
238 /** Pool debugfs directory. */
239 struct dentry *pl_debugfs_entry;
240 /** Pool name, must be long enough to hold compound proc entry name. */
242 /** Lock for protecting SLV/CLV updates. */
244 /** Number of allowed locks in in pool, both, client and server side. */
246 /** Number of granted locks in */
248 /** Grant rate per T. */
249 atomic_t pl_grant_rate;
250 /** Cancel rate per T. */
251 atomic_t pl_cancel_rate;
252 /** Server lock volume (SLV). Protected by pl_lock. */
253 __u64 pl_server_lock_volume;
254 /** Current biggest client lock volume. Protected by pl_lock. */
255 __u64 pl_client_lock_volume;
256 /** Lock volume factor. SLV on client is calculated as following:
257 * server_slv * lock_volume_factor. */
258 atomic_t pl_lock_volume_factor;
259 /** Time when last SLV from server was obtained. */
260 time64_t pl_recalc_time;
261 /** Recalculation period for pool. */
262 time64_t pl_recalc_period;
263 /** Recalculation and shrink operations. */
264 struct ldlm_pool_ops *pl_ops;
265 /** Number of planned locks for next period. */
267 /** Pool statistics. */
268 struct lprocfs_stats *pl_stats;
271 struct kobject pl_kobj;
272 struct completion pl_kobj_unregister;
275 typedef int (*ldlm_res_policy)(const struct lu_env *env,
276 struct ldlm_namespace *,
277 struct ldlm_lock **, void *req_cookie,
278 enum ldlm_mode mode, __u64 flags, void *data);
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 * To ensure delayed LVB initialization, it is highly recommended to use the set
293 * of ldlm_[res_]lvbo_[init,update,fill]() functions.
295 struct ldlm_valblock_ops {
296 int (*lvbo_init)(struct ldlm_resource *res);
297 int (*lvbo_update)(struct ldlm_resource *res, struct ldlm_lock *lock,
298 struct ptlrpc_request *r, int increase);
299 int (*lvbo_free)(struct ldlm_resource *res);
300 /* Return size of lvb data appropriate RPC size can be reserved */
301 int (*lvbo_size)(struct ldlm_lock *lock);
302 /* Called to fill in lvb data to RPC buffer @buf */
303 int (*lvbo_fill)(struct ldlm_lock *lock, void *buf, int *buflen);
307 * LDLM pools related, type of lock pool in the namespace.
308 * Greedy means release cached locks aggressively
311 LDLM_NAMESPACE_GREEDY = BIT(0),
312 LDLM_NAMESPACE_MODEST = BIT(1),
316 * Default values for the "max_nolock_size", "contention_time" and
317 * "contended_locks" namespace tunables.
319 #define NS_DEFAULT_MAX_NOLOCK_BYTES 0
320 #define NS_DEFAULT_CONTENTION_SECONDS 2
321 #define NS_DEFAULT_CONTENDED_LOCKS 32
323 struct ldlm_ns_bucket {
324 /** back pointer to namespace */
325 struct ldlm_namespace *nsb_namespace;
327 * Estimated lock callback time. Used by adaptive timeout code to
328 * avoid spurious client evictions due to unresponsiveness when in
329 * fact the network or overall system load is at fault
331 struct adaptive_timeout nsb_at_estimate;
333 * Which res in the bucket should we start with the reclaim.
335 int nsb_reclaim_start;
336 /* counter of entries in this bucket */
341 /** LDLM namespace lock stats */
347 LDLM_NS_TYPE_UNKNOWN = 0, /**< invalid type */
348 LDLM_NS_TYPE_MDC, /**< MDC namespace */
349 LDLM_NS_TYPE_MDT, /**< MDT namespace */
350 LDLM_NS_TYPE_OSC, /**< OSC namespace */
351 LDLM_NS_TYPE_OST, /**< OST namespace */
352 LDLM_NS_TYPE_MGC, /**< MGC namespace */
353 LDLM_NS_TYPE_MGT, /**< MGT namespace */
356 enum ldlm_namespace_flags {
358 * Flag to indicate the LRU cancel is in progress.
359 * Used to limit the process by 1 thread only.
367 * Namespace serves to contain locks related to a particular service.
368 * There are two kinds of namespaces:
369 * - Server namespace has knowledge of all locks and is therefore authoritative
370 * to make decisions like what locks could be granted and what conflicts
371 * exist during new lock enqueue.
372 * - Client namespace only has limited knowledge about locks in the namespace,
373 * only seeing locks held by the client.
375 * Every Lustre service has one server namespace present on the server serving
376 * that service. Every client connected to the service has a client namespace
378 * Every lock obtained by client in that namespace is actually represented by
379 * two in-memory locks. One on the server and one on the client. The locks are
380 * linked by a special cookie by which one node can tell to the other which lock
381 * it actually means during communications. Such locks are called remote locks.
382 * The locks held by server only without any reference to a client are called
385 struct ldlm_namespace {
386 /** Backward link to OBD, required for LDLM pool to store new SLV. */
387 struct obd_device *ns_obd;
389 /** Flag indicating if namespace is on client instead of server */
390 enum ldlm_side ns_client;
392 /** name of this namespace */
395 /** Resource hash table for namespace. */
396 struct cfs_hash *ns_rs_hash;
397 struct ldlm_ns_bucket *ns_rs_buckets;
398 unsigned int ns_bucket_bits;
403 /** big refcount (by bucket) */
407 * Namespace connect flags supported by server (may be changed via
408 * /proc, LRU resize may be disabled/enabled).
410 __u64 ns_connect_flags;
412 /** Client side original connect flags supported by server. */
413 __u64 ns_orig_connect_flags;
415 /* namespace debugfs dir entry */
416 struct dentry *ns_debugfs_entry;
419 * Position in global namespace list linking all namespaces on
422 struct list_head ns_list_chain;
425 * List of unused locks for this namespace. This list is also called
427 * Unused locks are locks with zero reader/writer reference counts.
428 * This list is only used on clients for lock caching purposes.
429 * When we want to release some locks voluntarily or if server wants
430 * us to release some locks due to e.g. memory pressure, we take locks
431 * to release from the head of this list.
432 * Locks are linked via l_lru field in \see struct ldlm_lock.
434 struct list_head ns_unused_list;
435 /** Number of locks in the LRU list above */
437 struct list_head *ns_last_pos;
440 * Maximum number of locks permitted in the LRU. If 0, means locks
441 * are managed by pools and there is no preset limit, rather it is all
442 * controlled by available memory on this client and on server.
444 unsigned int ns_max_unused;
446 /** Maximum allowed age (last used time) for locks in the LRU. Set in
447 * seconds from userspace, but stored in ns to avoid repeat conversions.
452 * Server only: number of times we evicted clients due to lack of reply
455 unsigned int ns_timeouts;
457 * Number of seconds since the file change time after which
458 * the MDT will return an UPDATE lock along with a LOOKUP lock.
459 * This allows the client to start caching negative dentries
460 * for a directory and may save an RPC for a later stat.
462 timeout_t ns_ctime_age_limit;
464 * Number of (nano)seconds since the lock was last used. The client
465 * may cancel the lock older than this age and flush related data if
466 * another client shows interest in this lock by doing glimpse request.
467 * This allows to cache stat data locally for such files early. Set in
468 * seconds from userspace, but stored in ns to avoid repeat conversions.
470 ktime_t ns_dirty_age_limit;
472 * Used to rate-limit ldlm_namespace_dump calls.
473 * \see ldlm_namespace_dump. Increased by 10 seconds every time
476 time64_t ns_next_dump;
478 /** "policy" function that does actual lock conflict determination */
479 ldlm_res_policy ns_policy;
482 * LVB operations for this namespace.
483 * \see struct ldlm_valblock_ops
485 struct ldlm_valblock_ops *ns_lvbo;
488 * Used by filter code to store pointer to OBD of the service.
489 * Should be dropped in favor of \a ns_obd
494 * Wait queue used by __ldlm_namespace_free. Gets woken up every time
495 * a resource is removed.
497 wait_queue_head_t ns_waitq;
498 /** LDLM pool structure for this namespace */
499 struct ldlm_pool ns_pool;
500 /** Definition of how eagerly unused locks will be released from LRU */
501 enum ldlm_appetite ns_appetite;
504 * If more than \a ns_contended_locks are found, the resource is
505 * considered to be contended. Lock enqueues might specify that no
506 * contended locks should be granted
508 unsigned ns_contended_locks;
511 * The resources in this namespace remember contended state during
512 * \a ns_contention_time, in seconds.
514 timeout_t ns_contention_time;
517 * Limit size of contended extent locks, in bytes.
518 * If extended lock is requested for more then this many bytes and
519 * caller instructs us not to grant contended locks, we would disregard
522 unsigned ns_max_nolock_size;
524 /** Limit of parallel AST RPC count. */
525 unsigned ns_max_parallel_ast;
528 * Callback to check if a lock is good to be canceled by ELC or
531 ldlm_cancel_cbt ns_cancel;
533 /** LDLM lock stats */
534 struct lprocfs_stats *ns_stats;
537 * Flag to indicate namespace is being freed. Used to determine if
538 * recalculation of LDLM pool statistics should be skipped.
540 unsigned ns_stopping:1;
543 * Which bucket should we start with the lock reclaim.
545 int ns_reclaim_start;
547 struct kobject ns_kobj; /* sysfs object */
548 struct completion ns_kobj_unregister;
551 * To avoid another ns_lock usage, a separate bitops field.
553 unsigned long ns_flags;
557 * Returns 1 if namespace \a ns is a client namespace.
559 static inline int ns_is_client(struct ldlm_namespace *ns)
562 LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT ||
563 ns->ns_client == LDLM_NAMESPACE_SERVER);
564 return ns->ns_client == LDLM_NAMESPACE_CLIENT;
568 * Returns 1 if namespace \a ns is a server namespace.
570 static inline int ns_is_server(struct ldlm_namespace *ns)
573 LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT ||
574 ns->ns_client == LDLM_NAMESPACE_SERVER);
575 return ns->ns_client == LDLM_NAMESPACE_SERVER;
579 * Returns 1 if namespace \a ns supports early lock cancel (ELC).
581 static inline int ns_connect_cancelset(struct ldlm_namespace *ns)
584 return !!(ns->ns_connect_flags & OBD_CONNECT_CANCELSET);
588 * Returns 1 if this namespace supports lru_resize.
590 static inline int ns_connect_lru_resize(struct ldlm_namespace *ns)
593 return !!(ns->ns_connect_flags & OBD_CONNECT_LRU_RESIZE);
596 static inline void ns_register_cancel(struct ldlm_namespace *ns,
605 /** Type for blocking callback function of a lock. */
606 typedef int (*ldlm_blocking_callback)(struct ldlm_lock *lock,
607 struct ldlm_lock_desc *new, void *data,
609 /** Type for completion callback function of a lock. */
610 typedef int (*ldlm_completion_callback)(struct ldlm_lock *lock, __u64 flags,
612 /** Type for glimpse callback function of a lock. */
613 typedef int (*ldlm_glimpse_callback)(struct ldlm_lock *lock, void *data);
615 /** Type for created callback function of a lock. */
616 typedef void (*ldlm_created_callback)(struct ldlm_lock *lock);
618 /** Work list for sending GL ASTs to multiple locks. */
619 struct ldlm_glimpse_work {
620 struct ldlm_lock *gl_lock; /* lock to glimpse */
621 struct list_head gl_list; /* linkage to other gl work structs */
622 __u32 gl_flags;/* see LDLM_GL_WORK_* below */
623 union ldlm_gl_desc *gl_desc; /* glimpse descriptor to be packed in
624 * glimpse callback request */
625 ptlrpc_interpterer_t gl_interpret_reply;
626 void *gl_interpret_data;
629 struct ldlm_bl_desc {
630 unsigned int bl_same_client:1,
634 struct ldlm_cb_set_arg {
635 struct ptlrpc_request_set *set;
636 int type; /* LDLM_{CP,BL,GL}_CALLBACK */
638 struct list_head *list;
639 union ldlm_gl_desc *gl_desc; /* glimpse AST descriptor */
640 ptlrpc_interpterer_t gl_interpret_reply;
641 void *gl_interpret_data;
642 struct ldlm_bl_desc *bl_desc;
645 struct ldlm_cb_async_args {
646 struct ldlm_cb_set_arg *ca_set_arg;
647 struct ldlm_lock *ca_lock;
650 /** The ldlm_glimpse_work was slab allocated & must be freed accordingly.*/
651 #define LDLM_GL_WORK_SLAB_ALLOCATED 0x1
653 /** Interval node data for each LDLM_EXTENT lock. */
654 struct ldlm_interval {
655 struct interval_node li_node; /* node for tree management */
656 struct list_head li_group; /* the locks which have the same
657 * policy - group of the policy */
659 #define to_ldlm_interval(n) container_of(n, struct ldlm_interval, li_node)
662 * Interval tree for extent locks.
663 * The interval tree must be accessed under the resource lock.
664 * Interval trees are used for granted extent locks to speed up conflicts
665 * lookup. See ldlm/interval_tree.c for more details.
667 struct ldlm_interval_tree {
670 enum ldlm_mode lit_mode; /* lock mode */
671 struct interval_node *lit_root; /* actual ldlm_interval */
675 * Lists of waiting locks for each inodebit type.
676 * A lock can be in several liq_waiting lists and it remains in lr_waiting.
678 struct ldlm_ibits_queues {
679 struct list_head liq_waiting[MDS_INODELOCK_NUMBITS];
682 struct ldlm_ibits_node {
683 struct list_head lin_link[MDS_INODELOCK_NUMBITS];
684 struct ldlm_lock *lock;
687 /** Whether to track references to exports by LDLM locks. */
688 #define LUSTRE_TRACKS_LOCK_EXP_REFS (0)
691 enum ldlm_cancel_flags {
692 LCF_ASYNC = 0x1, /* Cancel locks asynchronously. */
693 LCF_LOCAL = 0x2, /* Cancel locks locally, not notifing server */
694 LCF_BL_AST = 0x4, /* Cancel LDLM_FL_BL_AST locks in the same RPC */
701 __u64 blocking_owner;
702 struct obd_export *blocking_export;
703 atomic_t blocking_refs;
707 union ldlm_policy_data {
708 struct ldlm_extent l_extent;
709 struct ldlm_flock l_flock;
710 struct ldlm_inodebits l_inodebits;
713 void ldlm_convert_policy_to_wire(enum ldlm_type type,
714 const union ldlm_policy_data *lpolicy,
715 union ldlm_wire_policy_data *wpolicy);
716 void ldlm_convert_policy_to_local(struct obd_export *exp, enum ldlm_type type,
717 const union ldlm_wire_policy_data *wpolicy,
718 union ldlm_policy_data *lpolicy);
728 * LDLM_GID_ANY is used to match any group id in ldlm_lock_match().
730 #define LDLM_GID_ANY ((__u64)-1)
733 * LDLM lock structure
735 * Represents a single LDLM lock and its state in memory. Each lock is
736 * associated with a single ldlm_resource, the object which is being
737 * locked. There may be multiple ldlm_locks on a single resource,
738 * depending on the lock type and whether the locks are conflicting or
744 * When remote side wants to tell us about a lock, they address
745 * it by this opaque handle. The handle does not hold a
746 * reference on the ldlm_lock, so it can be safely passed to
747 * other threads or nodes. When the lock needs to be accessed
748 * from the handle, it is looked up again in the lock table, and
749 * may no longer exist.
751 * Must be first in the structure.
753 struct portals_handle l_handle;
755 * Internal spinlock protects l_resource. We should hold this lock
756 * first before taking res_lock.
760 * Pointer to actual resource this lock is in.
761 * ldlm_lock_change_resource() can change this.
763 struct ldlm_resource *l_resource;
765 * List item for client side LRU list.
766 * Protected by ns_lock in struct ldlm_namespace.
768 struct list_head l_lru;
770 * Linkage to resource's lock queues according to current lock state.
771 * (could be granted or waiting)
772 * Protected by lr_lock in struct ldlm_resource.
774 struct list_head l_res_link;
776 * Internal structures per lock type..
779 struct ldlm_interval *l_tree_node;
780 struct ldlm_ibits_node *l_ibits_node;
783 * Per export hash of locks.
784 * Protected by per-bucket exp->exp_lock_hash locks.
786 struct hlist_node l_exp_hash;
788 * Per export hash of flock locks.
789 * Protected by per-bucket exp->exp_flock_hash locks.
791 struct hlist_node l_exp_flock_hash;
794 * Protected by lr_lock.
796 enum ldlm_mode l_req_mode;
798 * Granted mode, also protected by lr_lock.
800 enum ldlm_mode l_granted_mode;
801 /** Lock completion handler pointer. Called when lock is granted. */
802 ldlm_completion_callback l_completion_ast;
804 * Lock blocking AST handler pointer.
805 * It plays two roles:
806 * - as a notification of an attempt to queue a conflicting lock (once)
807 * - as a notification when the lock is being cancelled.
809 * As such it's typically called twice: once for the initial conflict
810 * and then once more when the last user went away and the lock is
811 * cancelled (could happen recursively).
813 ldlm_blocking_callback l_blocking_ast;
815 * Lock glimpse handler.
816 * Glimpse handler is used to obtain LVB updates from a client by
819 ldlm_glimpse_callback l_glimpse_ast;
823 * This is a pointer to actual client export for locks that were granted
824 * to clients. Used server-side.
826 struct obd_export *l_export;
828 * Lock connection export.
829 * Pointer to server export on a client.
831 struct obd_export *l_conn_export;
834 * Remote lock handle.
835 * If the lock is remote, this is the handle of the other side lock
838 struct lustre_handle l_remote_handle;
841 * Representation of private data specific for a lock type.
842 * Examples are: extent range for extent lock or bitmask for ibits locks
844 union ldlm_policy_data l_policy_data;
847 * Lock state flags. Protected by lr_lock.
848 * \see lustre_dlm_flags.h where the bits are defined.
853 * Lock r/w usage counters.
854 * Protected by lr_lock.
859 * If the lock is granted, a process sleeps on this waitq to learn when
860 * it's no longer in use. If the lock is not granted, a process sleeps
861 * on this waitq to learn when it becomes granted.
863 wait_queue_head_t l_waitq;
866 * Time, in nanoseconds, last used by e.g. being matched by lock match.
870 /** Originally requested extent for the extent lock. */
871 struct ldlm_extent l_req_extent;
874 * Client-side-only members.
877 enum lvb_type l_lvb_type;
880 * Temporary storage for a LVB received during an enqueue operation.
881 * May be vmalloc'd, so needs to be freed with OBD_FREE_LARGE().
886 /** Private storage for lock user. Opaque to LDLM. */
891 * Seconds. It will be updated if there is any activity related to
892 * the lock at client, e.g. enqueue the lock. For server it is the
893 * time when blocking ast was sent.
896 time64_t l_blast_sent;
899 /* separate ost_lvb used mostly by Data-on-MDT for now.
900 * It is introduced to don't mix with layout lock data. */
901 struct ost_lvb l_ost_lvb;
903 * Server-side-only members.
907 * Connection cookie for the client originating the operation.
908 * Used by Commit on Share (COS) code. Currently only used for
909 * inodebits locks on MDS.
911 __u64 l_client_cookie;
914 * List item for locks waiting for cancellation from clients.
915 * The lists this could be linked into are:
916 * waiting_locks_list (protected by waiting_locks_spinlock),
917 * then if the lock timed out, it is moved to
918 * expired_lock_list for further processing.
920 struct list_head l_pending_chain;
923 * Set when lock is sent a blocking AST. Time in seconds when timeout
924 * is reached and client holding this lock could be evicted.
925 * This timeout could be further extended by e.g. certain IO activity
927 * \see ost_rw_prolong_locks
929 time64_t l_callback_timestamp;
931 /** Local PID of process which created this lock. */
935 * Number of times blocking AST was sent for this lock.
936 * This is for debugging. Valid values are 0 and 1, if there is an
937 * attempt to send blocking AST more than once, an assertion would be
938 * hit. \see ldlm_work_bl_ast_lock
941 /** List item ldlm_add_ast_work_item() for case of blocking ASTs. */
942 struct list_head l_bl_ast;
943 /** List item ldlm_add_ast_work_item() for case of completion ASTs. */
944 struct list_head l_cp_ast;
945 /** For ldlm_add_ast_work_item() for "revoke" AST used in COS. */
946 struct list_head l_rk_ast;
949 * Pointer to a conflicting lock that caused blocking AST to be sent
952 struct ldlm_lock *l_blocking_lock;
955 * Protected by lr_lock, linkages to "skip lists".
956 * For more explanations of skip lists see ldlm/ldlm_inodebits.c
958 struct list_head l_sl_mode;
959 struct list_head l_sl_policy;
961 /** Reference tracking structure to debug leaked locks. */
962 struct lu_ref l_reference;
963 #if LUSTRE_TRACKS_LOCK_EXP_REFS
964 /* Debugging stuff for bug 20498, for tracking export references. */
965 /** number of export references taken */
967 /** link all locks referencing one export */
968 struct list_head l_exp_refs_link;
969 /** referenced export object */
970 struct obd_export *l_exp_refs_target;
973 * export blocking dlm lock list, protected by
974 * l_export->exp_bl_list_lock.
975 * Lock order of waiting_lists_spinlock, exp_bl_list_lock and res lock
976 * is: res lock -> exp_bl_list_lock -> wanting_lists_spinlock.
978 struct list_head l_exp_list;
982 * Describe the overlap between two locks. itree_overlap_cb data.
984 struct ldlm_match_data {
985 struct ldlm_lock *lmd_old;
986 struct ldlm_lock *lmd_lock;
987 enum ldlm_mode *lmd_mode;
988 union ldlm_policy_data *lmd_policy;
990 __u64 lmd_skip_flags;
992 bool lmd_has_ast_data;
995 /** For uncommitted cross-MDT lock, store transno this lock belongs to */
996 #define l_transno l_client_cookie
998 /** For uncommitted cross-MDT lock, which is client lock, share with l_rk_ast
999 * which is for server. */
1000 #define l_slc_link l_rk_ast
1002 #define HANDLE_MAP_SIZE ((LMV_MAX_STRIPE_COUNT + 7) >> 3)
1004 struct lustre_handle_array {
1005 unsigned int ha_count;
1006 /* ha_map is used as bit flag to indicate handle is remote or local */
1007 char ha_map[HANDLE_MAP_SIZE];
1008 struct lustre_handle ha_handles[0];
1012 * LDLM resource description.
1013 * Basically, resource is a representation for a single object.
1014 * Object has a name which is currently 4 64-bit integers. LDLM user is
1015 * responsible for creation of a mapping between objects it wants to be
1016 * protected and resource names.
1018 * A resource can only hold locks of a single lock type, though there may be
1019 * multiple ldlm_locks on a single resource, depending on the lock type and
1020 * whether the locks are conflicting or not.
1022 struct ldlm_resource {
1023 struct ldlm_ns_bucket *lr_ns_bucket;
1026 * List item for list in namespace hash.
1027 * protected by ns_lock
1029 struct hlist_node lr_hash;
1031 /** Reference count for this resource */
1032 atomic_t lr_refcount;
1034 /** Spinlock to protect locks under this resource. */
1038 * protected by lr_lock
1040 /** List of locks in granted state */
1041 struct list_head lr_granted;
1043 * List of locks that could not be granted due to conflicts and
1044 * that are waiting for conflicts to go away */
1045 struct list_head lr_waiting;
1048 /** Resource name */
1049 struct ldlm_res_id lr_name;
1053 * Interval trees (only for extent locks) for all modes of
1056 struct ldlm_interval_tree *lr_itree;
1057 struct ldlm_ibits_queues *lr_ibits_queues;
1062 * When the resource was considered as contended,
1063 * used only on server side.
1065 time64_t lr_contention_time;
1067 * Associated inode, used only on client side.
1069 struct inode *lr_lvb_inode;
1072 /** Type of locks this resource can hold. Only one type per resource. */
1073 enum ldlm_type lr_type; /* LDLM_{PLAIN,EXTENT,FLOCK,IBITS} */
1076 * Server-side-only lock value block elements.
1077 * To serialize lvbo_init.
1080 struct mutex lr_lvb_mutex;
1081 /** protected by lr_lock */
1083 /** is lvb initialized ? */
1084 bool lr_lvb_initialized;
1086 /** List of references to this resource. For debugging. */
1087 struct lu_ref lr_reference;
1090 static inline int ldlm_is_granted(struct ldlm_lock *lock)
1092 return lock->l_req_mode == lock->l_granted_mode;
1095 static inline bool ldlm_has_layout(struct ldlm_lock *lock)
1097 return lock->l_resource->lr_type == LDLM_IBITS &&
1098 lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_LAYOUT;
1101 static inline bool ldlm_has_dom(struct ldlm_lock *lock)
1103 return lock->l_resource->lr_type == LDLM_IBITS &&
1104 lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_DOM;
1107 static inline char *
1108 ldlm_ns_name(struct ldlm_namespace *ns)
1113 static inline struct ldlm_namespace *
1114 ldlm_res_to_ns(struct ldlm_resource *res)
1116 return res->lr_ns_bucket->nsb_namespace;
1119 static inline struct ldlm_namespace *
1120 ldlm_lock_to_ns(struct ldlm_lock *lock)
1122 return ldlm_res_to_ns(lock->l_resource);
1125 static inline char *
1126 ldlm_lock_to_ns_name(struct ldlm_lock *lock)
1128 return ldlm_ns_name(ldlm_lock_to_ns(lock));
1131 static inline struct adaptive_timeout *
1132 ldlm_lock_to_ns_at(struct ldlm_lock *lock)
1134 return &lock->l_resource->lr_ns_bucket->nsb_at_estimate;
1137 static inline int ldlm_lvbo_init(struct ldlm_resource *res)
1139 struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1142 if (ns->ns_lvbo == NULL || ns->ns_lvbo->lvbo_init == NULL ||
1143 res->lr_lvb_initialized)
1146 mutex_lock(&res->lr_lvb_mutex);
1147 /* Did we lose the race? */
1148 if (res->lr_lvb_initialized) {
1149 mutex_unlock(&res->lr_lvb_mutex);
1152 rc = ns->ns_lvbo->lvbo_init(res);
1154 CDEBUG(D_DLMTRACE, "lvbo_init failed for resource : rc = %d\n",
1156 if (res->lr_lvb_data != NULL) {
1157 OBD_FREE(res->lr_lvb_data, res->lr_lvb_len);
1158 res->lr_lvb_data = NULL;
1160 res->lr_lvb_len = rc;
1162 res->lr_lvb_initialized = true;
1164 mutex_unlock(&res->lr_lvb_mutex);
1168 static inline int ldlm_lvbo_size(struct ldlm_lock *lock)
1170 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
1172 if (ns->ns_lvbo != NULL && ns->ns_lvbo->lvbo_size != NULL)
1173 return ns->ns_lvbo->lvbo_size(lock);
1178 static inline int ldlm_lvbo_fill(struct ldlm_lock *lock, void *buf, int *len)
1180 struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
1183 if (ns->ns_lvbo != NULL) {
1184 LASSERT(ns->ns_lvbo->lvbo_fill != NULL);
1185 /* init lvb now if not already */
1186 rc = ldlm_lvbo_init(lock->l_resource);
1188 CERROR("lock %p: delayed lvb init failed (rc %d)",
1192 return ns->ns_lvbo->lvbo_fill(lock, buf, len);
1197 struct ldlm_ast_work {
1198 struct ldlm_lock *w_lock;
1200 struct ldlm_lock_desc w_desc;
1201 struct list_head w_list;
1208 * Common ldlm_enqueue parameters
1210 struct ldlm_enqueue_info {
1211 enum ldlm_type ei_type; /** Type of the lock being enqueued. */
1212 enum ldlm_mode ei_mode; /** Mode of the lock being enqueued. */
1213 void *ei_cb_bl; /** blocking lock callback */
1214 void *ei_cb_local_bl; /** blocking local lock callback */
1215 void *ei_cb_cp; /** lock completion callback */
1216 void *ei_cb_gl; /** lock glimpse callback */
1217 ldlm_created_callback ei_cb_created; /** lock created callback */
1218 void *ei_cbdata; /** Data to be passed into callbacks. */
1219 void *ei_namespace; /** lock namespace **/
1220 u64 ei_inodebits; /** lock inode bits **/
1221 unsigned int ei_enq_slave:1; /** whether enqueue slave stripes */
1222 unsigned int ei_enq_slot:1; /** whether acquire rpc slot */
1225 #define ei_res_id ei_cb_gl
1227 extern char *ldlm_lockname[];
1228 extern char *ldlm_typename[];
1229 extern const char *ldlm_it2str(enum ldlm_intent_flags it);
1232 * Just a fancy CDEBUG call with log level preset to LDLM_DEBUG.
1233 * For the cases where we do not have actual lock to print along
1234 * with a debugging message that is ldlm-related
1236 #define LDLM_DEBUG_NOLOCK(format, a...) \
1237 CDEBUG(D_DLMTRACE, "### " format "\n" , ##a)
1240 * Support function for lock information printing into debug logs.
1244 #define ldlm_lock_debug(msgdata, mask, cdls, lock, fmt, a...) do { \
1245 CFS_CHECK_STACK(msgdata, mask, cdls); \
1247 if (((mask) & D_CANTMASK) != 0 || \
1248 ((libcfs_debug & (mask)) != 0 && \
1249 (libcfs_subsystem_debug & DEBUG_SUBSYSTEM) != 0)) \
1250 _ldlm_lock_debug(lock, msgdata, fmt, ##a); \
1253 void _ldlm_lock_debug(struct ldlm_lock *lock,
1254 struct libcfs_debug_msg_data *data,
1255 const char *fmt, ...)
1256 __attribute__ ((format (printf, 3, 4)));
1259 * Rate-limited version of lock printing function.
1261 #define LDLM_DEBUG_LIMIT(mask, lock, fmt, a...) do { \
1262 static struct cfs_debug_limit_state _ldlm_cdls; \
1263 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, mask, &_ldlm_cdls); \
1264 ldlm_lock_debug(&msgdata, mask, &_ldlm_cdls, lock, "### " fmt , ##a);\
1267 #define LDLM_ERROR(lock, fmt, a...) LDLM_DEBUG_LIMIT(D_ERROR, lock, fmt, ## a)
1268 #define LDLM_WARN(lock, fmt, a...) LDLM_DEBUG_LIMIT(D_WARNING, lock, fmt, ## a)
1270 /** Non-rate-limited lock printing function for debugging purposes. */
1271 #define LDLM_DEBUG(lock, fmt, a...) do { \
1272 if (likely(lock != NULL)) { \
1273 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_DLMTRACE, NULL); \
1274 ldlm_lock_debug(&msgdata, D_DLMTRACE, NULL, lock, \
1275 "### " fmt , ##a); \
1277 LDLM_DEBUG_NOLOCK("no dlm lock: " fmt, ##a); \
1280 #else /* !LIBCFS_DEBUG */
1281 # define LDLM_DEBUG_LIMIT(mask, lock, fmt, a...) ((void)0)
1282 # define LDLM_DEBUG(lock, fmt, a...) ((void)0)
1283 # define LDLM_ERROR(lock, fmt, a...) ((void)0)
1287 * Three intentions can be used for the policy functions in
1288 * ldlm_processing_policy.
1290 * LDLM_PROCESS_RESCAN:
1292 * It's used when policy functions are called from ldlm_reprocess_queue() to
1293 * reprocess the wait list and try to grant locks, blocking ASTs
1294 * have already been sent in this situation, completion ASTs need be sent for
1295 * the locks being granted.
1297 * LDLM_PROCESS_ENQUEUE:
1299 * It's used when policy functions are called from ldlm_lock_enqueue() to
1300 * process the wait list for handling an enqueue request, blocking
1301 * ASTs have not been sent yet, so list of conflicting locks would be
1302 * collected and ASTs sent.
1304 * LDLM_PROCESS_RECOVERY:
1306 * It's used when policy functions are called from ldlm_reprocess_queue() to
1307 * reprocess the wait list when recovery done. In case of blocking
1308 * ASTs are lost before recovery, it needs not only to grant locks if
1309 * available, but also send blocking ASTs to the locks doesn't have AST sent
1310 * flag. Completion ASTs need be sent for the locks being granted.
1312 enum ldlm_process_intention {
1313 LDLM_PROCESS_RESCAN = 0,
1314 LDLM_PROCESS_ENQUEUE = 1,
1315 LDLM_PROCESS_RECOVERY = 2,
1318 typedef int (*ldlm_processing_policy)(struct ldlm_lock *lock, __u64 *flags,
1319 enum ldlm_process_intention intention,
1320 enum ldlm_error *err,
1321 struct list_head *work_list);
1323 typedef int (*ldlm_reprocessing_policy)(struct ldlm_resource *res,
1324 struct list_head *queue,
1325 struct list_head *work_list,
1326 enum ldlm_process_intention intention,
1327 struct ldlm_lock *hint);
1330 * Return values for lock iterators.
1331 * Also used during deciding of lock grants and cancellations.
1333 #define LDLM_ITER_CONTINUE 1 /* keep iterating */
1334 #define LDLM_ITER_STOP 2 /* stop iterating */
1336 typedef int (*ldlm_iterator_t)(struct ldlm_lock *, void *);
1337 typedef int (*ldlm_res_iterator_t)(struct ldlm_resource *, void *);
1339 /** \defgroup ldlm_iterator Lock iterators
1341 * LDLM provides for a way to iterate through every lock on a resource or
1342 * namespace or every resource in a namespace.
1344 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
1346 void ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
1348 int ldlm_resource_iterate(struct ldlm_namespace *, const struct ldlm_res_id *,
1349 ldlm_iterator_t iter, void *data);
1350 /** @} ldlm_iterator */
1352 int ldlm_replay_locks(struct obd_import *imp);
1355 int ldlm_flock_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data);
1358 __u64 ldlm_extent_shift_kms(struct ldlm_lock *lock, __u64 old_kms);
1360 struct ldlm_prolong_args {
1361 struct obd_export *lpa_export;
1362 struct ldlm_res_id lpa_resid;
1363 struct ldlm_extent lpa_extent;
1364 enum ldlm_mode lpa_mode;
1365 timeout_t lpa_timeout;
1369 void ldlm_lock_prolong_one(struct ldlm_lock *lock,
1370 struct ldlm_prolong_args *arg);
1371 void ldlm_resource_prolong(struct ldlm_prolong_args *arg);
1373 struct ldlm_callback_suite {
1374 ldlm_completion_callback lcs_completion;
1375 ldlm_blocking_callback lcs_blocking;
1376 ldlm_glimpse_callback lcs_glimpse;
1380 #ifdef HAVE_SERVER_SUPPORT
1381 /** \defgroup ldlm_srv_ast Server AST handlers
1382 * These are AST handlers used by server code.
1383 * Their property is that they are just preparing RPCs to be sent to clients.
1386 int ldlm_server_blocking_ast(struct ldlm_lock *, struct ldlm_lock_desc *,
1387 void *data, int flag);
1388 int ldlm_server_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data);
1389 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data);
1390 int ldlm_glimpse_locks(struct ldlm_resource *res,
1391 struct list_head *gl_work_list);
1392 /** @} ldlm_srv_ast */
1394 /** \defgroup ldlm_handlers Server LDLM handlers
1395 * These are handler functions that should be called by "frontends" such as
1396 * MDT or OST to pass through LDLM requests to LDLM for handling
1399 int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req,
1400 const struct ldlm_request *dlm_req,
1401 const struct ldlm_callback_suite *cbs);
1402 int ldlm_handle_convert0(struct ptlrpc_request *req,
1403 const struct ldlm_request *dlm_req);
1404 int ldlm_handle_cancel(struct ptlrpc_request *req);
1405 int ldlm_request_cancel(struct ptlrpc_request *req,
1406 const struct ldlm_request *dlm_req,
1407 int first, enum lustre_at_flags flags);
1408 /** @} ldlm_handlers */
1410 void ldlm_revoke_export_locks(struct obd_export *exp);
1411 timeout_t ldlm_bl_timeout(struct ldlm_lock *lock);
1413 int ldlm_del_waiting_lock(struct ldlm_lock *lock);
1414 int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, timeout_t timeout);
1415 int ldlm_get_ref(void);
1416 void ldlm_put_ref(void);
1417 int ldlm_init_export(struct obd_export *exp);
1418 void ldlm_destroy_export(struct obd_export *exp);
1419 struct ldlm_lock *ldlm_request_lock(struct ptlrpc_request *req);
1422 #ifdef HAVE_SERVER_SUPPORT
1423 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res);
1424 ldlm_reprocessing_policy
1425 ldlm_get_reprocessing_policy(struct ldlm_resource *res);
1427 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg);
1428 void ldlm_lock2handle(const struct ldlm_lock *lock,
1429 struct lustre_handle *lockh);
1430 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *, __u64 flags);
1431 void ldlm_cancel_callback(struct ldlm_lock *);
1432 int ldlm_lock_remove_from_lru(struct ldlm_lock *);
1433 int ldlm_lock_set_data(const struct lustre_handle *lockh, void *data);
1436 * Obtain a lock reference by its handle.
1438 static inline struct ldlm_lock *ldlm_handle2lock(const struct lustre_handle *h)
1440 return __ldlm_handle2lock(h, 0);
1443 #define LDLM_LOCK_REF_DEL(lock) \
1444 lu_ref_del(&lock->l_reference, "handle", lock)
1446 static inline struct ldlm_lock *
1447 ldlm_handle2lock_long(const struct lustre_handle *h, __u64 flags)
1449 struct ldlm_lock *lock;
1451 lock = __ldlm_handle2lock(h, flags);
1453 LDLM_LOCK_REF_DEL(lock);
1458 * Update Lock Value Block Operations (LVBO) on a resource taking into account
1459 * data from request \a r
1461 static inline int ldlm_lvbo_update(struct ldlm_resource *res,
1462 struct ldlm_lock *lock,
1463 struct ptlrpc_request *req, int increase)
1465 struct ldlm_namespace *ns = ldlm_res_to_ns(res);
1468 /* delayed lvb init may be required */
1469 rc = ldlm_lvbo_init(res);
1471 CERROR("delayed lvb init failed (rc %d)\n", rc);
1475 if (ns->ns_lvbo && ns->ns_lvbo->lvbo_update)
1476 return ns->ns_lvbo->lvbo_update(res, lock, req, increase);
1481 static inline int ldlm_res_lvbo_update(struct ldlm_resource *res,
1482 struct ptlrpc_request *req,
1485 return ldlm_lvbo_update(res, NULL, req, increase);
1488 int is_granted_or_cancelled_nolock(struct ldlm_lock *lock);
1490 int ldlm_error2errno(enum ldlm_error error);
1491 enum ldlm_error ldlm_errno2error(int err_no); /* don't call it `errno': this
1492 * confuses user-space. */
1493 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1494 void ldlm_dump_export_locks(struct obd_export *exp);
1498 * Release a temporary lock reference obtained by ldlm_handle2lock() or
1499 * __ldlm_handle2lock().
1501 #define LDLM_LOCK_PUT(lock) \
1503 LDLM_LOCK_REF_DEL(lock); \
1504 /*LDLM_DEBUG((lock), "put");*/ \
1505 ldlm_lock_put(lock); \
1509 * Release a lock reference obtained by some other means (see
1512 #define LDLM_LOCK_RELEASE(lock) \
1514 /*LDLM_DEBUG((lock), "put");*/ \
1515 ldlm_lock_put(lock); \
1518 #define LDLM_LOCK_GET(lock) \
1520 ldlm_lock_get(lock); \
1521 /*LDLM_DEBUG((lock), "get");*/ \
1525 #define ldlm_lock_list_put(head, member, count) \
1527 struct ldlm_lock *_lock, *_next; \
1529 list_for_each_entry_safe(_lock, _next, head, member) { \
1532 list_del_init(&_lock->member); \
1533 LDLM_LOCK_RELEASE(_lock); \
1538 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock);
1539 void ldlm_lock_put(struct ldlm_lock *lock);
1540 void ldlm_lock_destroy(struct ldlm_lock *lock);
1541 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
1542 void ldlm_lock_addref(const struct lustre_handle *lockh, enum ldlm_mode mode);
1543 int ldlm_lock_addref_try(const struct lustre_handle *lockh,
1544 enum ldlm_mode mode);
1545 void ldlm_lock_decref(const struct lustre_handle *lockh, enum ldlm_mode mode);
1546 void ldlm_lock_decref_and_cancel(const struct lustre_handle *lockh,
1547 enum ldlm_mode mode);
1548 void ldlm_lock_fail_match_locked(struct ldlm_lock *lock);
1549 void ldlm_lock_fail_match(struct ldlm_lock *lock);
1550 void ldlm_lock_allow_match(struct ldlm_lock *lock);
1551 void ldlm_lock_allow_match_locked(struct ldlm_lock *lock);
1552 enum ldlm_mode ldlm_lock_match_with_skip(struct ldlm_namespace *ns,
1553 __u64 flags, __u64 skip_flags,
1554 const struct ldlm_res_id *res_id,
1555 enum ldlm_type type,
1556 union ldlm_policy_data *policy,
1557 enum ldlm_mode mode,
1558 struct lustre_handle *lh,
1560 static inline enum ldlm_mode ldlm_lock_match(struct ldlm_namespace *ns,
1562 const struct ldlm_res_id *res_id,
1563 enum ldlm_type type,
1564 union ldlm_policy_data *policy,
1565 enum ldlm_mode mode,
1566 struct lustre_handle *lh,
1569 return ldlm_lock_match_with_skip(ns, flags, 0, res_id, type, policy,
1572 struct ldlm_lock *search_itree(struct ldlm_resource *res,
1573 struct ldlm_match_data *data);
1574 enum ldlm_mode ldlm_revalidate_lock_handle(const struct lustre_handle *lockh,
1576 void ldlm_lock_mode_downgrade(struct ldlm_lock *lock, enum ldlm_mode new_mode);
1577 void ldlm_lock_cancel(struct ldlm_lock *lock);
1578 void ldlm_reprocess_all(struct ldlm_resource *res, struct ldlm_lock *hint);
1579 void ldlm_reprocess_recovery_done(struct ldlm_namespace *ns);
1580 void ldlm_lock_dump_handle(int level, const struct lustre_handle *lockh);
1581 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req);
1584 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
1585 enum ldlm_side client,
1586 enum ldlm_appetite apt,
1587 enum ldlm_ns_type ns_type);
1588 int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags);
1589 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
1590 struct obd_import *imp,
1592 void ldlm_namespace_free_post(struct ldlm_namespace *ns);
1593 void ldlm_namespace_free(struct ldlm_namespace *ns,
1594 struct obd_import *imp, int force);
1595 void ldlm_namespace_register(struct ldlm_namespace *ns, enum ldlm_side client);
1596 void ldlm_namespace_unregister(struct ldlm_namespace *ns,
1597 enum ldlm_side client);
1598 void ldlm_namespace_get(struct ldlm_namespace *ns);
1599 void ldlm_namespace_put(struct ldlm_namespace *ns);
1601 int ldlm_debugfs_setup(void);
1602 void ldlm_debugfs_cleanup(void);
1604 static inline void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req,
1605 struct lprocfs_stats *srv_stats)
1607 int lock_type = 0, op = 0;
1609 lock_type = dlm_req->lock_desc.l_resource.lr_type;
1611 switch (lock_type) {
1613 op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE;
1616 op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE;
1619 op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE;
1622 op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE;
1630 lprocfs_counter_incr(srv_stats, op);
1633 /* resource.c - internal */
1634 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
1635 struct ldlm_resource *parent,
1636 const struct ldlm_res_id *,
1637 enum ldlm_type type, int create);
1638 struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res);
1639 int ldlm_resource_putref(struct ldlm_resource *res);
1640 void ldlm_resource_add_lock(struct ldlm_resource *res,
1641 struct list_head *head,
1642 struct ldlm_lock *lock);
1643 void ldlm_resource_unlink_lock(struct ldlm_lock *lock);
1644 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
1645 void ldlm_dump_all_namespaces(enum ldlm_side client, int level);
1646 void ldlm_namespace_dump(int level, struct ldlm_namespace *);
1647 void ldlm_resource_dump(int level, struct ldlm_resource *);
1648 int ldlm_lock_change_resource(struct ldlm_namespace *, struct ldlm_lock *,
1649 const struct ldlm_res_id *);
1651 #define LDLM_RESOURCE_ADDREF(res) do { \
1652 lu_ref_add_atomic(&(res)->lr_reference, __FUNCTION__, current); \
1655 #define LDLM_RESOURCE_DELREF(res) do { \
1656 lu_ref_del(&(res)->lr_reference, __FUNCTION__, current); \
1659 /* ldlm_request.c */
1660 /** \defgroup ldlm_local_ast Default AST handlers for local locks
1661 * These AST handlers are typically used for server-side local locks and are
1662 * also used by client-side lock handlers to perform minimum level base
1665 int ldlm_blocking_ast_nocheck(struct ldlm_lock *lock);
1666 int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1667 void *data, int flag);
1668 int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp);
1669 int ldlm_completion_ast_async(struct ldlm_lock *lock, __u64 flags, void *data);
1670 int ldlm_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data);
1671 /** @} ldlm_local_ast */
1673 /** \defgroup ldlm_cli_api API to operate on locks from actual LDLM users.
1674 * These are typically used by client and server (*_local versions)
1675 * to obtain and release locks.
1677 int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
1678 struct ldlm_enqueue_info *einfo,
1679 const struct ldlm_res_id *res_id,
1680 union ldlm_policy_data const *policy, __u64 *flags,
1681 void *lvb, __u32 lvb_len, enum lvb_type lvb_type,
1682 struct lustre_handle *lockh, int async);
1683 int ldlm_prep_enqueue_req(struct obd_export *exp,
1684 struct ptlrpc_request *req,
1685 struct list_head *cancels,
1687 int ldlm_prep_elc_req(struct obd_export *exp, struct ptlrpc_request *req,
1688 int version, int opc, int canceloff,
1689 struct list_head *cancels, int count);
1691 struct ptlrpc_request *ldlm_enqueue_pack(struct obd_export *exp, int lvb_len);
1692 int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req,
1693 const struct ldlm_request *dlm_req,
1694 const struct ldlm_callback_suite *cbs);
1695 int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
1696 enum ldlm_type type, __u8 with_policy,
1697 enum ldlm_mode mode, __u64 *flags, void *lvb,
1699 const struct lustre_handle *lockh, int rc);
1700 int ldlm_cli_enqueue_local(const struct lu_env *env,
1701 struct ldlm_namespace *ns,
1702 const struct ldlm_res_id *res_id,
1703 enum ldlm_type type, union ldlm_policy_data *policy,
1704 enum ldlm_mode mode, __u64 *flags,
1705 ldlm_blocking_callback blocking,
1706 ldlm_completion_callback completion,
1707 ldlm_glimpse_callback glimpse,
1708 void *data, __u32 lvb_len, enum lvb_type lvb_type,
1709 const __u64 *client_cookie,
1710 struct lustre_handle *lockh);
1711 int ldlm_cli_convert_req(struct ldlm_lock *lock, __u32 *flags, __u64 new_bits);
1712 int ldlm_cli_convert(struct ldlm_lock *lock,
1713 enum ldlm_cancel_flags cancel_flags);
1714 int ldlm_cli_update_pool(struct ptlrpc_request *req);
1715 int ldlm_cli_cancel(const struct lustre_handle *lockh,
1716 enum ldlm_cancel_flags cancel_flags);
1717 int ldlm_cli_cancel_unused(struct ldlm_namespace *, const struct ldlm_res_id *,
1718 enum ldlm_cancel_flags flags, void *opaque);
1719 int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
1720 const struct ldlm_res_id *res_id,
1721 union ldlm_policy_data *policy,
1722 enum ldlm_mode mode,
1723 enum ldlm_cancel_flags flags, void *opaque);
1724 int ldlm_cli_cancel_req(struct obd_export *exp, struct list_head *head,
1725 int count, enum ldlm_cancel_flags flags);
1726 int ldlm_cancel_resource_local(struct ldlm_resource *res,
1727 struct list_head *cancels,
1728 union ldlm_policy_data *policy,
1729 enum ldlm_mode mode, __u64 lock_flags,
1730 enum ldlm_cancel_flags cancel_flags,
1732 int ldlm_cli_cancel_list_local(struct list_head *cancels, int count,
1733 enum ldlm_cancel_flags flags);
1734 int ldlm_cli_cancel_list(struct list_head *head, int count,
1735 struct ptlrpc_request *req,
1736 enum ldlm_cancel_flags flags);
1738 int ldlm_inodebits_drop(struct ldlm_lock *lock, __u64 to_drop);
1739 int ldlm_cli_inodebits_convert(struct ldlm_lock *lock,
1740 enum ldlm_cancel_flags cancel_flags);
1742 /** @} ldlm_cli_api */
1744 extern unsigned int ldlm_enqueue_min;
1747 /* This has to be here because recursive inclusion sucks. */
1748 int intent_disposition(struct ldlm_reply *rep, int flag);
1749 void intent_set_disposition(struct ldlm_reply *rep, int flag);
1752 * "Modes" of acquiring lock_res, necessary to tell lockdep that taking more
1753 * than one lock_res is dead-lock safe.
1755 enum lock_res_type {
1760 /** Lock resource. */
1761 static inline void lock_res(struct ldlm_resource *res)
1763 spin_lock(&res->lr_lock);
1766 /** Lock resource with a way to instruct lockdep code about nestedness-safe. */
1767 static inline void lock_res_nested(struct ldlm_resource *res,
1768 enum lock_res_type mode)
1770 spin_lock_nested(&res->lr_lock, mode);
1773 /** Unlock resource. */
1774 static inline void unlock_res(struct ldlm_resource *res)
1776 spin_unlock(&res->lr_lock);
1779 /** Check if resource is already locked, assert if not. */
1780 static inline void check_res_locked(struct ldlm_resource *res)
1782 assert_spin_locked(&res->lr_lock);
1785 struct ldlm_resource * lock_res_and_lock(struct ldlm_lock *lock);
1786 void unlock_res_and_lock(struct ldlm_lock *lock);
1789 /** \defgroup ldlm_pools Various LDLM pool related functions
1790 * There are not used outside of ldlm.
1793 int ldlm_pools_init(void);
1794 void ldlm_pools_fini(void);
1796 int ldlm_pool_init(struct ldlm_pool *pl, struct ldlm_namespace *ns,
1797 int idx, enum ldlm_side client);
1798 int ldlm_pool_shrink(struct ldlm_pool *pl, int nr, gfp_t gfp_mask);
1799 void ldlm_pool_fini(struct ldlm_pool *pl);
1800 int ldlm_pool_setup(struct ldlm_pool *pl, int limit);
1801 time64_t ldlm_pool_recalc(struct ldlm_pool *pl);
1802 __u32 ldlm_pool_get_lvf(struct ldlm_pool *pl);
1803 __u64 ldlm_pool_get_slv(struct ldlm_pool *pl);
1804 __u64 ldlm_pool_get_clv(struct ldlm_pool *pl);
1805 __u32 ldlm_pool_get_limit(struct ldlm_pool *pl);
1806 void ldlm_pool_set_slv(struct ldlm_pool *pl, __u64 slv);
1807 void ldlm_pool_set_clv(struct ldlm_pool *pl, __u64 clv);
1808 void ldlm_pool_set_limit(struct ldlm_pool *pl, __u32 limit);
1809 void ldlm_pool_add(struct ldlm_pool *pl, struct ldlm_lock *lock);
1810 void ldlm_pool_del(struct ldlm_pool *pl, struct ldlm_lock *lock);
1813 static inline int ldlm_extent_overlap(const struct ldlm_extent *ex1,
1814 const struct ldlm_extent *ex2)
1816 return ex1->start <= ex2->end && ex2->start <= ex1->end;
1819 /* check if @ex1 contains @ex2 */
1820 static inline int ldlm_extent_contain(const struct ldlm_extent *ex1,
1821 const struct ldlm_extent *ex2)
1823 return ex1->start <= ex2->start && ex1->end >= ex2->end;
1826 int ldlm_inodebits_drop(struct ldlm_lock *lock, __u64 to_drop);