/* * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 only, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License version 2 for more details (a copy is included * in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * * GPL HEADER END */ /* * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * * Copyright (c) 2010, 2013, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ * Lustre is a trademark of Sun Microsystems, Inc. */ /** \defgroup LDLM Lustre Distributed Lock Manager * * Lustre DLM is based on VAX DLM. * Its two main roles are: * - To provide locking assuring consistency of data on all Lustre nodes. * - To allow clients to cache state protected by a lock by holding the * lock until a conflicting lock is requested or it is expired by the LRU. * * @{ */ #ifndef _LUSTRE_DLM_H__ #define _LUSTRE_DLM_H__ #if defined(__linux__) #include #elif defined(__APPLE__) #include #elif defined(__WINNT__) #include #else #error Unsupported operating system. #endif #include #include #include #include #include /* for interval_node{}, ldlm_extent */ #include #include "lustre_dlm_flags.h" struct obd_ops; struct obd_device; #define OBD_LDLM_DEVICENAME "ldlm" #define LDLM_DEFAULT_LRU_SIZE (100 * num_online_cpus()) #define LDLM_DEFAULT_MAX_ALIVE (cfs_time_seconds(36000)) #define LDLM_CTIME_AGE_LIMIT (10) #define LDLM_DEFAULT_PARALLEL_AST_LIMIT 1024 /** * LDLM non-error return states */ typedef enum { ELDLM_OK = 0, ELDLM_LOCK_CHANGED = 300, ELDLM_LOCK_ABORTED = 301, ELDLM_LOCK_REPLACED = 302, ELDLM_NO_LOCK_DATA = 303, ELDLM_LOCK_WOULDBLOCK = 304, ELDLM_NAMESPACE_EXISTS = 400, ELDLM_BAD_NAMESPACE = 401 } ldlm_error_t; /** * LDLM namespace type. * The "client" type is actually an indication that this is a narrow local view * into complete namespace on the server. Such namespaces cannot make any * decisions about lack of conflicts or do any autonomous lock granting without * first speaking to a server. */ typedef enum { LDLM_NAMESPACE_SERVER = 1 << 0, LDLM_NAMESPACE_CLIENT = 1 << 1 } ldlm_side_t; /** * The blocking callback is overloaded to perform two functions. These flags * indicate which operation should be performed. */ #define LDLM_CB_BLOCKING 1 #define LDLM_CB_CANCELING 2 /** * \name Lock Compatibility Matrix. * * A lock has both a type (extent, flock, inode bits, or plain) and a mode. * Lock types are described in their respective implementation files: * ldlm_{extent,flock,inodebits,plain}.c. * * There are six lock modes along with a compatibility matrix to indicate if * two locks are compatible. * * - EX: Exclusive mode. Before a new file is created, MDS requests EX lock * on the parent. * - PW: Protective Write (normal write) mode. When a client requests a write * lock from an OST, a lock with PW mode will be issued. * - PR: Protective Read (normal read) mode. When a client requests a read from * an OST, a lock with PR mode will be issued. Also, if the client opens a * file for execution, it is granted a lock with PR mode. * - CW: Concurrent Write mode. The type of lock that the MDS grants if a client * requests a write lock during a file open operation. * - CR Concurrent Read mode. When a client performs a path lookup, MDS grants * an inodebit lock with the CR mode on the intermediate path component. * - NL Null mode. * * 
 *       NL  CR  CW  PR  PW  EX
 *  NL    1   1   1   1   1   1
 *  CR    1   1   1   1   1   0
 *  CW    1   1   1   0   0   0
 *  PR    1   1   0   1   0   0
 *  PW    1   1   0   0   0   0
 *  EX    1   0   0   0   0   0
 *
*/ /** @{ */ #define LCK_COMPAT_EX LCK_NL #define LCK_COMPAT_PW (LCK_COMPAT_EX | LCK_CR) #define LCK_COMPAT_PR (LCK_COMPAT_PW | LCK_PR) #define LCK_COMPAT_CW (LCK_COMPAT_PW | LCK_CW) #define LCK_COMPAT_CR (LCK_COMPAT_CW | LCK_PR | LCK_PW) #define LCK_COMPAT_NL (LCK_COMPAT_CR | LCK_EX | LCK_GROUP) #define LCK_COMPAT_GROUP (LCK_GROUP | LCK_NL) #define LCK_COMPAT_COS (LCK_COS) /** @} Lock Compatibility Matrix */ extern ldlm_mode_t lck_compat_array[]; static inline void lockmode_verify(ldlm_mode_t mode) { LASSERT(mode > LCK_MINMODE && mode < LCK_MAXMODE); } static inline int lockmode_compat(ldlm_mode_t exist_mode, ldlm_mode_t new_mode) { return (lck_compat_array[exist_mode] & new_mode); } /* * * cluster name spaces * */ #define DLM_OST_NAMESPACE 1 #define DLM_MDS_NAMESPACE 2 /* XXX - do we just separate this by security domains and use a prefix for multiple namespaces in the same domain? - */ /** * Locking rules for LDLM: * * lr_lock * * lr_lock * waiting_locks_spinlock * * lr_lock * led_lock * * lr_lock * ns_lock * * lr_lvb_mutex * lr_lock * */ struct ldlm_pool; struct ldlm_lock; struct ldlm_resource; struct ldlm_namespace; /** * Operations on LDLM pools. * LDLM pool is a pool of locks in the namespace without any implicitly * specified limits. * Locks in the pool are organized in LRU. * Local memory pressure or server instructions (e.g. mempressure on server) * can trigger freeing of locks from the pool */ struct ldlm_pool_ops { /** Recalculate pool \a pl usage */ int (*po_recalc)(struct ldlm_pool *pl); /** Cancel at least \a nr locks from pool \a pl */ int (*po_shrink)(struct ldlm_pool *pl, int nr, unsigned int gfp_mask); int (*po_setup)(struct ldlm_pool *pl, int limit); }; /** One second for pools thread check interval. Each pool has own period. */ #define LDLM_POOLS_THREAD_PERIOD (1) /** ~6% margin for modest pools. See ldlm_pool.c for details. */ #define LDLM_POOLS_MODEST_MARGIN_SHIFT (4) /** Default recalc period for server side pools in sec. */ #define LDLM_POOL_SRV_DEF_RECALC_PERIOD (1) /** Default recalc period for client side pools in sec. */ #define LDLM_POOL_CLI_DEF_RECALC_PERIOD (10) /** * LDLM pool structure to track granted locks. * For purposes of determining when to release locks on e.g. memory pressure. * This feature is commonly referred to as lru_resize. */ struct ldlm_pool { /** Pool proc directory. */ struct proc_dir_entry *pl_proc_dir; /** Pool name, must be long enough to hold compound proc entry name. */ char pl_name[100]; /** Lock for protecting SLV/CLV updates. */ spinlock_t pl_lock; /** Number of allowed locks in in pool, both, client and server side. */ cfs_atomic_t pl_limit; /** Number of granted locks in */ cfs_atomic_t pl_granted; /** Grant rate per T. */ cfs_atomic_t pl_grant_rate; /** Cancel rate per T. */ cfs_atomic_t pl_cancel_rate; /** Server lock volume (SLV). Protected by pl_lock. */ __u64 pl_server_lock_volume; /** Current biggest client lock volume. Protected by pl_lock. */ __u64 pl_client_lock_volume; /** Lock volume factor. SLV on client is calculated as following: * server_slv * lock_volume_factor. */ cfs_atomic_t pl_lock_volume_factor; /** Time when last SLV from server was obtained. */ time_t pl_recalc_time; /** Recalculation period for pool. */ time_t pl_recalc_period; /** Recalculation and shrink operations. */ struct ldlm_pool_ops *pl_ops; /** Number of planned locks for next period. */ int pl_grant_plan; /** Pool statistics. */ struct lprocfs_stats *pl_stats; }; typedef int (*ldlm_res_policy)(struct ldlm_namespace *, struct ldlm_lock **, void *req_cookie, ldlm_mode_t mode, __u64 flags, void *data); typedef int (*ldlm_cancel_for_recovery)(struct ldlm_lock *lock); /** * LVB operations. * LVB is Lock Value Block. This is a special opaque (to LDLM) value that could * be associated with an LDLM lock and transferred from client to server and * back. * * Currently LVBs are used by: * - OSC-OST code to maintain current object size/times * - layout lock code to return the layout when the layout lock is granted */ struct ldlm_valblock_ops { int (*lvbo_init)(struct ldlm_resource *res); int (*lvbo_update)(struct ldlm_resource *res, struct ptlrpc_request *r, int increase); int (*lvbo_free)(struct ldlm_resource *res); /* Return size of lvb data appropriate RPC size can be reserved */ int (*lvbo_size)(struct ldlm_lock *lock); /* Called to fill in lvb data to RPC buffer @buf */ int (*lvbo_fill)(struct ldlm_lock *lock, void *buf, int buflen); }; /** * LDLM pools related, type of lock pool in the namespace. * Greedy means release cached locks aggressively */ typedef enum { LDLM_NAMESPACE_GREEDY = 1 << 0, LDLM_NAMESPACE_MODEST = 1 << 1 } ldlm_appetite_t; /** * Default values for the "max_nolock_size", "contention_time" and * "contended_locks" namespace tunables. */ #define NS_DEFAULT_MAX_NOLOCK_BYTES 0 #define NS_DEFAULT_CONTENTION_SECONDS 2 #define NS_DEFAULT_CONTENDED_LOCKS 32 struct ldlm_ns_bucket { /** back pointer to namespace */ struct ldlm_namespace *nsb_namespace; /** * Estimated lock callback time. Used by adaptive timeout code to * avoid spurious client evictions due to unresponsiveness when in * fact the network or overall system load is at fault */ struct adaptive_timeout nsb_at_estimate; }; enum { /** LDLM namespace lock stats */ LDLM_NSS_LOCKS = 0, LDLM_NSS_LAST }; typedef enum { /** invalide type */ LDLM_NS_TYPE_UNKNOWN = 0, /** mdc namespace */ LDLM_NS_TYPE_MDC, /** mds namespace */ LDLM_NS_TYPE_MDT, /** osc namespace */ LDLM_NS_TYPE_OSC, /** ost namespace */ LDLM_NS_TYPE_OST, /** mgc namespace */ LDLM_NS_TYPE_MGC, /** mgs namespace */ LDLM_NS_TYPE_MGT, } ldlm_ns_type_t; /** * LDLM Namespace. * * Namespace serves to contain locks related to a particular service. * There are two kinds of namespaces: * - Server namespace has knowledge of all locks and is therefore authoritative * to make decisions like what locks could be granted and what conflicts * exist during new lock enqueue. * - Client namespace only has limited knowledge about locks in the namespace, * only seeing locks held by the client. * * Every Lustre service has one server namespace present on the server serving * that service. Every client connected to the service has a client namespace * for it. * Every lock obtained by client in that namespace is actually represented by * two in-memory locks. One on the server and one on the client. The locks are * linked by a special cookie by which one node can tell to the other which lock * it actually means during communications. Such locks are called remote locks. * The locks held by server only without any reference to a client are called * local locks. */ struct ldlm_namespace { /** Backward link to OBD, required for LDLM pool to store new SLV. */ struct obd_device *ns_obd; /** Flag indicating if namespace is on client instead of server */ ldlm_side_t ns_client; /** Resource hash table for namespace. */ cfs_hash_t *ns_rs_hash; /** serialize */ spinlock_t ns_lock; /** big refcount (by bucket) */ cfs_atomic_t ns_bref; /** * Namespace connect flags supported by server (may be changed via * /proc, LRU resize may be disabled/enabled). */ __u64 ns_connect_flags; /** Client side original connect flags supported by server. */ __u64 ns_orig_connect_flags; /* namespace proc dir entry */ struct proc_dir_entry *ns_proc_dir_entry; /** * Position in global namespace list linking all namespaces on * the node. */ cfs_list_t ns_list_chain; /** * List of unused locks for this namespace. This list is also called * LRU lock list. * Unused locks are locks with zero reader/writer reference counts. * This list is only used on clients for lock caching purposes. * When we want to release some locks voluntarily or if server wants * us to release some locks due to e.g. memory pressure, we take locks * to release from the head of this list. * Locks are linked via l_lru field in \see struct ldlm_lock. */ cfs_list_t ns_unused_list; /** Number of locks in the LRU list above */ int ns_nr_unused; /** * Maximum number of locks permitted in the LRU. If 0, means locks * are managed by pools and there is no preset limit, rather it is all * controlled by available memory on this client and on server. */ unsigned int ns_max_unused; /** Maximum allowed age (last used time) for locks in the LRU */ unsigned int ns_max_age; /** * Server only: number of times we evicted clients due to lack of reply * to ASTs. */ unsigned int ns_timeouts; /** * Number of seconds since the file change time after which the * MDT will return an UPDATE lock along with a LOOKUP lock. * This allows the client to start caching negative dentries * for a directory and may save an RPC for a later stat. */ unsigned int ns_ctime_age_limit; /** * Used to rate-limit ldlm_namespace_dump calls. * \see ldlm_namespace_dump. Increased by 10 seconds every time * it is called. */ cfs_time_t ns_next_dump; /** "policy" function that does actual lock conflict determination */ ldlm_res_policy ns_policy; /** * LVB operations for this namespace. * \see struct ldlm_valblock_ops */ struct ldlm_valblock_ops *ns_lvbo; /** * Used by filter code to store pointer to OBD of the service. * Should be dropped in favor of \a ns_obd */ void *ns_lvbp; /** * Wait queue used by __ldlm_namespace_free. Gets woken up every time * a resource is removed. */ wait_queue_head_t ns_waitq; /** LDLM pool structure for this namespace */ struct ldlm_pool ns_pool; /** Definition of how eagerly unused locks will be released from LRU */ ldlm_appetite_t ns_appetite; /** * If more than \a ns_contended_locks are found, the resource is * considered to be contended. Lock enqueues might specify that no * contended locks should be granted */ unsigned ns_contended_locks; /** * The resources in this namespace remember contended state during * \a ns_contention_time, in seconds. */ unsigned ns_contention_time; /** * Limit size of contended extent locks, in bytes. * If extended lock is requested for more then this many bytes and * caller instructs us not to grant contended locks, we would disregard * such a request. */ unsigned ns_max_nolock_size; /** Limit of parallel AST RPC count. */ unsigned ns_max_parallel_ast; /** Callback to cancel locks before replaying it during recovery. */ ldlm_cancel_for_recovery ns_cancel_for_recovery; /** LDLM lock stats */ struct lprocfs_stats *ns_stats; /** * Flag to indicate namespace is being freed. Used to determine if * recalculation of LDLM pool statistics should be skipped. */ unsigned ns_stopping:1; }; /** * Returns 1 if namespace \a ns is a client namespace. */ static inline int ns_is_client(struct ldlm_namespace *ns) { LASSERT(ns != NULL); LASSERT(!(ns->ns_client & ~(LDLM_NAMESPACE_CLIENT | LDLM_NAMESPACE_SERVER))); LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT || ns->ns_client == LDLM_NAMESPACE_SERVER); return ns->ns_client == LDLM_NAMESPACE_CLIENT; } /** * Returns 1 if namespace \a ns is a server namespace. */ static inline int ns_is_server(struct ldlm_namespace *ns) { LASSERT(ns != NULL); LASSERT(!(ns->ns_client & ~(LDLM_NAMESPACE_CLIENT | LDLM_NAMESPACE_SERVER))); LASSERT(ns->ns_client == LDLM_NAMESPACE_CLIENT || ns->ns_client == LDLM_NAMESPACE_SERVER); return ns->ns_client == LDLM_NAMESPACE_SERVER; } /** * Returns 1 if namespace \a ns supports early lock cancel (ELC). */ static inline int ns_connect_cancelset(struct ldlm_namespace *ns) { LASSERT(ns != NULL); return !!(ns->ns_connect_flags & OBD_CONNECT_CANCELSET); } /** * Returns 1 if this namespace supports lru_resize. */ static inline int ns_connect_lru_resize(struct ldlm_namespace *ns) { LASSERT(ns != NULL); return !!(ns->ns_connect_flags & OBD_CONNECT_LRU_RESIZE); } static inline void ns_register_cancel(struct ldlm_namespace *ns, ldlm_cancel_for_recovery arg) { LASSERT(ns != NULL); ns->ns_cancel_for_recovery = arg; } struct ldlm_lock; /** Type for blocking callback function of a lock. */ typedef int (*ldlm_blocking_callback)(struct ldlm_lock *lock, struct ldlm_lock_desc *new, void *data, int flag); /** Type for completion callback function of a lock. */ typedef int (*ldlm_completion_callback)(struct ldlm_lock *lock, __u64 flags, void *data); /** Type for glimpse callback function of a lock. */ typedef int (*ldlm_glimpse_callback)(struct ldlm_lock *lock, void *data); /** Work list for sending GL ASTs to multiple locks. */ struct ldlm_glimpse_work { struct ldlm_lock *gl_lock; /* lock to glimpse */ cfs_list_t gl_list; /* linkage to other gl work structs */ __u32 gl_flags;/* see LDLM_GL_WORK_* below */ union ldlm_gl_desc *gl_desc; /* glimpse descriptor to be packed in * glimpse callback request */ }; /** The ldlm_glimpse_work is allocated on the stack and should not be freed. */ #define LDLM_GL_WORK_NOFREE 0x1 /** Interval node data for each LDLM_EXTENT lock. */ struct ldlm_interval { struct interval_node li_node; /* node for tree management */ cfs_list_t li_group; /* the locks which have the same * policy - group of the policy */ }; #define to_ldlm_interval(n) container_of(n, struct ldlm_interval, li_node) /** * Interval tree for extent locks. * The interval tree must be accessed under the resource lock. * Interval trees are used for granted extent locks to speed up conflicts * lookup. See ldlm/interval_tree.c for more details. */ struct ldlm_interval_tree { /** Tree size. */ int lit_size; ldlm_mode_t lit_mode; /* lock mode */ struct interval_node *lit_root; /* actual ldlm_interval */ }; /** Whether to track references to exports by LDLM locks. */ #define LUSTRE_TRACKS_LOCK_EXP_REFS (0) /** Cancel flags. */ typedef enum { LCF_ASYNC = 0x1, /* Cancel locks asynchronously. */ LCF_LOCAL = 0x2, /* Cancel locks locally, not notifing server */ LCF_BL_AST = 0x4, /* Cancel locks marked as LDLM_FL_BL_AST * in the same RPC */ } ldlm_cancel_flags_t; struct ldlm_flock { __u64 start; __u64 end; __u64 owner; __u64 blocking_owner; struct obd_export *blocking_export; /* Protected by the hash lock */ __u32 blocking_refs; __u32 pid; }; typedef union { struct ldlm_extent l_extent; struct ldlm_flock l_flock; struct ldlm_inodebits l_inodebits; } ldlm_policy_data_t; void ldlm_convert_policy_to_wire(ldlm_type_t type, const ldlm_policy_data_t *lpolicy, ldlm_wire_policy_data_t *wpolicy); void ldlm_convert_policy_to_local(struct obd_export *exp, ldlm_type_t type, const ldlm_wire_policy_data_t *wpolicy, ldlm_policy_data_t *lpolicy); enum lvb_type { LVB_T_NONE = 0, LVB_T_OST = 1, LVB_T_LQUOTA = 2, LVB_T_LAYOUT = 3, }; /** * LDLM lock structure * * Represents a single LDLM lock and its state in memory. Each lock is * associated with a single ldlm_resource, the object which is being * locked. There may be multiple ldlm_locks on a single resource, * depending on the lock type and whether the locks are conflicting or * not. */ struct ldlm_lock { /** * Local lock handle. * When remote side wants to tell us about a lock, they address * it by this opaque handle. The handle does not hold a * reference on the ldlm_lock, so it can be safely passed to * other threads or nodes. When the lock needs to be accessed * from the handle, it is looked up again in the lock table, and * may no longer exist. * * Must be first in the structure. */ struct portals_handle l_handle; /** * Lock reference count. * This is how many users have pointers to actual structure, so that * we do not accidentally free lock structure that is in use. */ cfs_atomic_t l_refc; /** * Internal spinlock protects l_resource. We should hold this lock * first before taking res_lock. */ spinlock_t l_lock; /** * Pointer to actual resource this lock is in. * ldlm_lock_change_resource() can change this. */ struct ldlm_resource *l_resource; /** * List item for client side LRU list. * Protected by ns_lock in struct ldlm_namespace. */ cfs_list_t l_lru; /** * Linkage to resource's lock queues according to current lock state. * (could be granted, waiting or converting) * Protected by lr_lock in struct ldlm_resource. */ cfs_list_t l_res_link; /** * Tree node for ldlm_extent. */ struct ldlm_interval *l_tree_node; /** * Per export hash of locks. * Protected by per-bucket exp->exp_lock_hash locks. */ cfs_hlist_node_t l_exp_hash; /** * Per export hash of flock locks. * Protected by per-bucket exp->exp_flock_hash locks. */ cfs_hlist_node_t l_exp_flock_hash; /** * Requested mode. * Protected by lr_lock. */ ldlm_mode_t l_req_mode; /** * Granted mode, also protected by lr_lock. */ ldlm_mode_t l_granted_mode; /** Lock completion handler pointer. Called when lock is granted. */ ldlm_completion_callback l_completion_ast; /** * Lock blocking AST handler pointer. * It plays two roles: * - as a notification of an attempt to queue a conflicting lock (once) * - as a notification when the lock is being cancelled. * * As such it's typically called twice: once for the initial conflict * and then once more when the last user went away and the lock is * cancelled (could happen recursively). */ ldlm_blocking_callback l_blocking_ast; /** * Lock glimpse handler. * Glimpse handler is used to obtain LVB updates from a client by * server */ ldlm_glimpse_callback l_glimpse_ast; /** * Lock export. * This is a pointer to actual client export for locks that were granted * to clients. Used server-side. */ struct obd_export *l_export; /** * Lock connection export. * Pointer to server export on a client. */ struct obd_export *l_conn_export; /** * Remote lock handle. * If the lock is remote, this is the handle of the other side lock * (l_handle) */ struct lustre_handle l_remote_handle; /** * Representation of private data specific for a lock type. * Examples are: extent range for extent lock or bitmask for ibits locks */ ldlm_policy_data_t l_policy_data; /** * Lock state flags. Protected by lr_lock. * \see lustre_dlm_flags.h where the bits are defined. */ __u64 l_flags; /** * Lock r/w usage counters. * Protected by lr_lock. */ __u32 l_readers; __u32 l_writers; /** * If the lock is granted, a process sleeps on this waitq to learn when * it's no longer in use. If the lock is not granted, a process sleeps * on this waitq to learn when it becomes granted. */ wait_queue_head_t l_waitq; /** * Seconds. It will be updated if there is any activity related to * the lock, e.g. enqueue the lock or send blocking AST. */ cfs_time_t l_last_activity; /** * Time last used by e.g. being matched by lock match. * Jiffies. Should be converted to time if needed. */ cfs_time_t l_last_used; /** Originally requested extent for the extent lock. */ struct ldlm_extent l_req_extent; /* * Client-side-only members. */ enum lvb_type l_lvb_type; /** * Temporary storage for a LVB received during an enqueue operation. */ __u32 l_lvb_len; void *l_lvb_data; /** Private storage for lock user. Opaque to LDLM. */ void *l_ast_data; /* * Server-side-only members. */ /** * Connection cookie for the client originating the operation. * Used by Commit on Share (COS) code. Currently only used for * inodebits locks on MDS. */ __u64 l_client_cookie; /** * List item for locks waiting for cancellation from clients. * The lists this could be linked into are: * waiting_locks_list (protected by waiting_locks_spinlock), * then if the lock timed out, it is moved to * expired_lock_thread.elt_expired_locks for further processing. * Protected by elt_lock. */ cfs_list_t l_pending_chain; /** * Set when lock is sent a blocking AST. Time in seconds when timeout * is reached and client holding this lock could be evicted. * This timeout could be further extended by e.g. certain IO activity * under this lock. * \see ost_rw_prolong_locks */ cfs_time_t l_callback_timeout; /** Local PID of process which created this lock. */ __u32 l_pid; /** * Number of times blocking AST was sent for this lock. * This is for debugging. Valid values are 0 and 1, if there is an * attempt to send blocking AST more than once, an assertion would be * hit. \see ldlm_work_bl_ast_lock */ int l_bl_ast_run; /** List item ldlm_add_ast_work_item() for case of blocking ASTs. */ cfs_list_t l_bl_ast; /** List item ldlm_add_ast_work_item() for case of completion ASTs. */ cfs_list_t l_cp_ast; /** For ldlm_add_ast_work_item() for "revoke" AST used in COS. */ cfs_list_t l_rk_ast; /** * Pointer to a conflicting lock that caused blocking AST to be sent * for this lock */ struct ldlm_lock *l_blocking_lock; /** * Protected by lr_lock, linkages to "skip lists". * For more explanations of skip lists see ldlm/ldlm_inodebits.c */ cfs_list_t l_sl_mode; cfs_list_t l_sl_policy; /** Reference tracking structure to debug leaked locks. */ struct lu_ref l_reference; #if LUSTRE_TRACKS_LOCK_EXP_REFS /* Debugging stuff for bug 20498, for tracking export references. */ /** number of export references taken */ int l_exp_refs_nr; /** link all locks referencing one export */ cfs_list_t l_exp_refs_link; /** referenced export object */ struct obd_export *l_exp_refs_target; #endif /** * export blocking dlm lock list, protected by * l_export->exp_bl_list_lock. * Lock order of waiting_lists_spinlock, exp_bl_list_lock and res lock * is: res lock -> exp_bl_list_lock -> wanting_lists_spinlock. */ cfs_list_t l_exp_list; }; /** * LDLM resource description. * Basically, resource is a representation for a single object. * Object has a name which is currently 4 64-bit integers. LDLM user is * responsible for creation of a mapping between objects it wants to be * protected and resource names. * * A resource can only hold locks of a single lock type, though there may be * multiple ldlm_locks on a single resource, depending on the lock type and * whether the locks are conflicting or not. */ struct ldlm_resource { struct ldlm_ns_bucket *lr_ns_bucket; /** * List item for list in namespace hash. * protected by ns_lock */ cfs_hlist_node_t lr_hash; /** Spinlock to protect locks under this resource. */ spinlock_t lr_lock; /** * protected by lr_lock * @{ */ /** List of locks in granted state */ cfs_list_t lr_granted; /** List of locks waiting to change their granted mode (converted) */ cfs_list_t lr_converting; /** * List of locks that could not be granted due to conflicts and * that are waiting for conflicts to go away */ cfs_list_t lr_waiting; /** @} */ /* XXX No longer needed? Remove ASAP */ ldlm_mode_t lr_most_restr; /** Type of locks this resource can hold. Only one type per resource. */ ldlm_type_t lr_type; /* LDLM_{PLAIN,EXTENT,FLOCK,IBITS} */ /** Resource name */ struct ldlm_res_id lr_name; /** Reference count for this resource */ cfs_atomic_t lr_refcount; /** * Interval trees (only for extent locks) for all modes of this resource */ struct ldlm_interval_tree lr_itree[LCK_MODE_NUM]; /** * Server-side-only lock value block elements. * To serialize lvbo_init. */ struct mutex lr_lvb_mutex; int lr_lvb_len; /** protected by lr_lock */ void *lr_lvb_data; /** When the resource was considered as contended. */ cfs_time_t lr_contention_time; /** List of references to this resource. For debugging. */ struct lu_ref lr_reference; struct inode *lr_lvb_inode; }; static inline bool ldlm_has_layout(struct ldlm_lock *lock) { return lock->l_resource->lr_type == LDLM_IBITS && lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_LAYOUT; } static inline char * ldlm_ns_name(struct ldlm_namespace *ns) { return ns->ns_rs_hash->hs_name; } static inline struct ldlm_namespace * ldlm_res_to_ns(struct ldlm_resource *res) { return res->lr_ns_bucket->nsb_namespace; } static inline struct ldlm_namespace * ldlm_lock_to_ns(struct ldlm_lock *lock) { return ldlm_res_to_ns(lock->l_resource); } static inline char * ldlm_lock_to_ns_name(struct ldlm_lock *lock) { return ldlm_ns_name(ldlm_lock_to_ns(lock)); } static inline struct adaptive_timeout * ldlm_lock_to_ns_at(struct ldlm_lock *lock) { return &lock->l_resource->lr_ns_bucket->nsb_at_estimate; } static inline int ldlm_lvbo_init(struct ldlm_resource *res) { struct ldlm_namespace *ns = ldlm_res_to_ns(res); if (ns->ns_lvbo != NULL && ns->ns_lvbo->lvbo_init != NULL) return ns->ns_lvbo->lvbo_init(res); return 0; } static inline int ldlm_lvbo_size(struct ldlm_lock *lock) { struct ldlm_namespace *ns = ldlm_lock_to_ns(lock); if (ns->ns_lvbo != NULL && ns->ns_lvbo->lvbo_size != NULL) return ns->ns_lvbo->lvbo_size(lock); return 0; } static inline int ldlm_lvbo_fill(struct ldlm_lock *lock, void *buf, int len) { struct ldlm_namespace *ns = ldlm_lock_to_ns(lock); if (ns->ns_lvbo != NULL) { LASSERT(ns->ns_lvbo->lvbo_fill != NULL); return ns->ns_lvbo->lvbo_fill(lock, buf, len); } return 0; } struct ldlm_ast_work { struct ldlm_lock *w_lock; int w_blocking; struct ldlm_lock_desc w_desc; cfs_list_t w_list; int w_flags; void *w_data; int w_datalen; }; /** * Common ldlm_enqueue parameters */ struct ldlm_enqueue_info { __u32 ei_type; /** Type of the lock being enqueued. */ __u32 ei_mode; /** Mode of the lock being enqueued. */ void *ei_cb_bl; /** blocking lock callback */ void *ei_cb_cp; /** lock completion callback */ void *ei_cb_gl; /** lock glimpse callback */ void *ei_cbdata; /** Data to be passed into callbacks. */ }; extern struct obd_ops ldlm_obd_ops; extern char *ldlm_lockname[]; extern char *ldlm_typename[]; extern char *ldlm_it2str(int it); /** * Just a fancy CDEBUG call with log level preset to LDLM_DEBUG. * For the cases where we do not have actual lock to print along * with a debugging message that is ldlm-related */ #define LDLM_DEBUG_NOLOCK(format, a...) \ CDEBUG(D_DLMTRACE, "### " format "\n" , ##a) /** * Support function for lock information printing into debug logs. * \see LDLM_DEBUG */ #ifdef LIBCFS_DEBUG #define ldlm_lock_debug(msgdata, mask, cdls, lock, fmt, a...) do { \ CFS_CHECK_STACK(msgdata, mask, cdls); \ \ if (((mask) & D_CANTMASK) != 0 || \ ((libcfs_debug & (mask)) != 0 && \ (libcfs_subsystem_debug & DEBUG_SUBSYSTEM) != 0)) \ _ldlm_lock_debug(lock, msgdata, fmt, ##a); \ } while(0) void _ldlm_lock_debug(struct ldlm_lock *lock, struct libcfs_debug_msg_data *data, const char *fmt, ...) __attribute__ ((format (printf, 3, 4))); /** * Rate-limited version of lock printing function. */ #define LDLM_DEBUG_LIMIT(mask, lock, fmt, a...) do { \ static cfs_debug_limit_state_t _ldlm_cdls; \ LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, mask, &_ldlm_cdls); \ ldlm_lock_debug(&msgdata, mask, &_ldlm_cdls, lock, "### " fmt , ##a);\ } while (0) #define LDLM_ERROR(lock, fmt, a...) LDLM_DEBUG_LIMIT(D_ERROR, lock, fmt, ## a) #define LDLM_WARN(lock, fmt, a...) LDLM_DEBUG_LIMIT(D_WARNING, lock, fmt, ## a) /** Non-rate-limited lock printing function for debugging purposes. */ #define LDLM_DEBUG(lock, fmt, a...) do { \ if (likely(lock != NULL)) { \ LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_DLMTRACE, NULL); \ ldlm_lock_debug(&msgdata, D_DLMTRACE, NULL, lock, \ "### " fmt , ##a); \ } else { \ LDLM_DEBUG_NOLOCK("no dlm lock: " fmt, ##a); \ } \ } while (0) #else /* !LIBCFS_DEBUG */ # define LDLM_DEBUG_LIMIT(mask, lock, fmt, a...) ((void)0) # define LDLM_DEBUG(lock, fmt, a...) ((void)0) # define LDLM_ERROR(lock, fmt, a...) ((void)0) #endif typedef int (*ldlm_processing_policy)(struct ldlm_lock *lock, __u64 *flags, int first_enq, ldlm_error_t *err, cfs_list_t *work_list); /** * Return values for lock iterators. * Also used during deciding of lock grants and cancellations. */ #define LDLM_ITER_CONTINUE 1 /* keep iterating */ #define LDLM_ITER_STOP 2 /* stop iterating */ typedef int (*ldlm_iterator_t)(struct ldlm_lock *, void *); typedef int (*ldlm_res_iterator_t)(struct ldlm_resource *, void *); /** \defgroup ldlm_iterator Lock iterators * * LDLM provides for a way to iterate through every lock on a resource or * namespace or every resource in a namespace. * @{ */ int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter, void *closure); void ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter, void *closure); int ldlm_resource_iterate(struct ldlm_namespace *, const struct ldlm_res_id *, ldlm_iterator_t iter, void *data); /** @} ldlm_iterator */ int ldlm_replay_locks(struct obd_import *imp); /* ldlm_flock.c */ int ldlm_flock_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data); /* ldlm_extent.c */ __u64 ldlm_extent_shift_kms(struct ldlm_lock *lock, __u64 old_kms); struct ldlm_callback_suite { ldlm_completion_callback lcs_completion; ldlm_blocking_callback lcs_blocking; ldlm_glimpse_callback lcs_glimpse; }; /* ldlm_lockd.c */ #ifdef HAVE_SERVER_SUPPORT /** \defgroup ldlm_srv_ast Server AST handlers * These are AST handlers used by server code. * Their property is that they are just preparing RPCs to be sent to clients. * @{ */ int ldlm_server_blocking_ast(struct ldlm_lock *, struct ldlm_lock_desc *, void *data, int flag); int ldlm_server_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data); int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data); int ldlm_glimpse_locks(struct ldlm_resource *res, cfs_list_t *gl_work_list); /** @} ldlm_srv_ast */ /** \defgroup ldlm_handlers Server LDLM handlers * These are handler functions that should be called by "frontends" such as * MDT or OST to pass through LDLM requests to LDLM for handling * @{ */ int ldlm_handle_enqueue(struct ptlrpc_request *req, ldlm_completion_callback, ldlm_blocking_callback, ldlm_glimpse_callback); int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req, const struct ldlm_request *dlm_req, const struct ldlm_callback_suite *cbs); int ldlm_handle_convert(struct ptlrpc_request *req); int ldlm_handle_convert0(struct ptlrpc_request *req, const struct ldlm_request *dlm_req); int ldlm_handle_cancel(struct ptlrpc_request *req); int ldlm_request_cancel(struct ptlrpc_request *req, const struct ldlm_request *dlm_req, int first); /** @} ldlm_handlers */ void ldlm_revoke_export_locks(struct obd_export *exp); #endif int ldlm_del_waiting_lock(struct ldlm_lock *lock); int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout); int ldlm_get_ref(void); void ldlm_put_ref(void); int ldlm_init_export(struct obd_export *exp); void ldlm_destroy_export(struct obd_export *exp); struct ldlm_lock *ldlm_request_lock(struct ptlrpc_request *req); /* ldlm_lock.c */ #ifdef HAVE_SERVER_SUPPORT ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res); #endif void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg); void ldlm_lock2handle(const struct ldlm_lock *lock, struct lustre_handle *lockh); struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *, __u64 flags); void ldlm_cancel_callback(struct ldlm_lock *); int ldlm_lock_remove_from_lru(struct ldlm_lock *); int ldlm_lock_set_data(struct lustre_handle *, void *); /** * Obtain a lock reference by its handle. */ static inline struct ldlm_lock *ldlm_handle2lock(const struct lustre_handle *h) { return __ldlm_handle2lock(h, 0); } #define LDLM_LOCK_REF_DEL(lock) \ lu_ref_del(&lock->l_reference, "handle", current) static inline struct ldlm_lock * ldlm_handle2lock_long(const struct lustre_handle *h, __u64 flags) { struct ldlm_lock *lock; lock = __ldlm_handle2lock(h, flags); if (lock != NULL) LDLM_LOCK_REF_DEL(lock); return lock; } /** * Update Lock Value Block Operations (LVBO) on a resource taking into account * data from reqest \a r */ static inline int ldlm_res_lvbo_update(struct ldlm_resource *res, struct ptlrpc_request *r, int increase) { if (ldlm_res_to_ns(res)->ns_lvbo && ldlm_res_to_ns(res)->ns_lvbo->lvbo_update) { return ldlm_res_to_ns(res)->ns_lvbo->lvbo_update(res, r, increase); } return 0; } int ldlm_error2errno(ldlm_error_t error); ldlm_error_t ldlm_errno2error(int err_no); /* don't call it `errno': this * confuses user-space. */ #if LUSTRE_TRACKS_LOCK_EXP_REFS void ldlm_dump_export_locks(struct obd_export *exp); #endif /** * Release a temporary lock reference obtained by ldlm_handle2lock() or * __ldlm_handle2lock(). */ #define LDLM_LOCK_PUT(lock) \ do { \ LDLM_LOCK_REF_DEL(lock); \ /*LDLM_DEBUG((lock), "put");*/ \ ldlm_lock_put(lock); \ } while (0) /** * Release a lock reference obtained by some other means (see * LDLM_LOCK_PUT()). */ #define LDLM_LOCK_RELEASE(lock) \ do { \ /*LDLM_DEBUG((lock), "put");*/ \ ldlm_lock_put(lock); \ } while (0) #define LDLM_LOCK_GET(lock) \ ({ \ ldlm_lock_get(lock); \ /*LDLM_DEBUG((lock), "get");*/ \ lock; \ }) #define ldlm_lock_list_put(head, member, count) \ ({ \ struct ldlm_lock *_lock, *_next; \ int c = count; \ cfs_list_for_each_entry_safe(_lock, _next, head, member) { \ if (c-- == 0) \ break; \ cfs_list_del_init(&_lock->member); \ LDLM_LOCK_RELEASE(_lock); \ } \ LASSERT(c <= 0); \ }) struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock); void ldlm_lock_put(struct ldlm_lock *lock); void ldlm_lock_destroy(struct ldlm_lock *lock); void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc); void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode); int ldlm_lock_addref_try(struct lustre_handle *lockh, __u32 mode); void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode); void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode); void ldlm_lock_fail_match_locked(struct ldlm_lock *lock); void ldlm_lock_fail_match(struct ldlm_lock *lock); void ldlm_lock_allow_match(struct ldlm_lock *lock); void ldlm_lock_allow_match_locked(struct ldlm_lock *lock); ldlm_mode_t ldlm_lock_match(struct ldlm_namespace *ns, __u64 flags, const struct ldlm_res_id *, ldlm_type_t type, ldlm_policy_data_t *, ldlm_mode_t mode, struct lustre_handle *, int unref); ldlm_mode_t ldlm_revalidate_lock_handle(struct lustre_handle *lockh, __u64 *bits); struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode, __u32 *flags); void ldlm_lock_downgrade(struct ldlm_lock *lock, int new_mode); void ldlm_lock_cancel(struct ldlm_lock *lock); void ldlm_reprocess_all(struct ldlm_resource *res); void ldlm_reprocess_all_ns(struct ldlm_namespace *ns); void ldlm_lock_dump_handle(int level, struct lustre_handle *); void ldlm_unlink_lock_skiplist(struct ldlm_lock *req); /* resource.c */ struct ldlm_namespace * ldlm_namespace_new(struct obd_device *obd, char *name, ldlm_side_t client, ldlm_appetite_t apt, ldlm_ns_type_t ns_type); int ldlm_namespace_cleanup(struct ldlm_namespace *ns, __u64 flags); void ldlm_namespace_free(struct ldlm_namespace *ns, struct obd_import *imp, int force); void ldlm_namespace_register(struct ldlm_namespace *ns, ldlm_side_t client); void ldlm_namespace_unregister(struct ldlm_namespace *ns, ldlm_side_t client); void ldlm_namespace_get(struct ldlm_namespace *ns); void ldlm_namespace_put(struct ldlm_namespace *ns); int ldlm_proc_setup(void); #ifdef LPROCFS void ldlm_proc_cleanup(void); #else static inline void ldlm_proc_cleanup(void) {} #endif /* resource.c - internal */ struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns, struct ldlm_resource *parent, const struct ldlm_res_id *, ldlm_type_t type, int create); struct ldlm_resource *ldlm_resource_getref(struct ldlm_resource *res); int ldlm_resource_putref(struct ldlm_resource *res); void ldlm_resource_add_lock(struct ldlm_resource *res, cfs_list_t *head, struct ldlm_lock *lock); void ldlm_resource_unlink_lock(struct ldlm_lock *lock); void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc); void ldlm_dump_all_namespaces(ldlm_side_t client, int level); void ldlm_namespace_dump(int level, struct ldlm_namespace *); void ldlm_resource_dump(int level, struct ldlm_resource *); int ldlm_lock_change_resource(struct ldlm_namespace *, struct ldlm_lock *, const struct ldlm_res_id *); #define LDLM_RESOURCE_ADDREF(res) do { \ lu_ref_add_atomic(&(res)->lr_reference, __FUNCTION__, current); \ } while (0) #define LDLM_RESOURCE_DELREF(res) do { \ lu_ref_del(&(res)->lr_reference, __FUNCTION__, current); \ } while (0) /* ldlm_request.c */ int ldlm_expired_completion_wait(void *data); /** \defgroup ldlm_local_ast Default AST handlers for local locks * These AST handlers are typically used for server-side local locks and are * also used by client-side lock handlers to perform minimum level base * processing. * @{ */ int ldlm_blocking_ast_nocheck(struct ldlm_lock *lock); int ldlm_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc, void *data, int flag); int ldlm_glimpse_ast(struct ldlm_lock *lock, void *reqp); int ldlm_completion_ast_async(struct ldlm_lock *lock, __u64 flags, void *data); int ldlm_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data); /** @} ldlm_local_ast */ /** \defgroup ldlm_cli_api API to operate on locks from actual LDLM users. * These are typically used by client and server (*_local versions) * to obtain and release locks. * @{ */ int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp, struct ldlm_enqueue_info *einfo, const struct ldlm_res_id *res_id, ldlm_policy_data_t const *policy, __u64 *flags, void *lvb, __u32 lvb_len, enum lvb_type lvb_type, struct lustre_handle *lockh, int async); int ldlm_prep_enqueue_req(struct obd_export *exp, struct ptlrpc_request *req, cfs_list_t *cancels, int count); int ldlm_prep_elc_req(struct obd_export *exp, struct ptlrpc_request *req, int version, int opc, int canceloff, cfs_list_t *cancels, int count); struct ptlrpc_request *ldlm_enqueue_pack(struct obd_export *exp, int lvb_len); int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req, const struct ldlm_request *dlm_req, const struct ldlm_callback_suite *cbs); int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req, ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode, __u64 *flags, void *lvb, __u32 lvb_len, struct lustre_handle *lockh, int rc); int ldlm_cli_enqueue_local(struct ldlm_namespace *ns, const struct ldlm_res_id *res_id, ldlm_type_t type, ldlm_policy_data_t *policy, ldlm_mode_t mode, __u64 *flags, ldlm_blocking_callback blocking, ldlm_completion_callback completion, ldlm_glimpse_callback glimpse, void *data, __u32 lvb_len, enum lvb_type lvb_type, const __u64 *client_cookie, struct lustre_handle *lockh); int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new, void *data, __u32 data_len); int ldlm_cli_convert(struct lustre_handle *, int new_mode, __u32 *flags); int ldlm_cli_update_pool(struct ptlrpc_request *req); int ldlm_cli_cancel(struct lustre_handle *lockh, ldlm_cancel_flags_t cancel_flags); int ldlm_cli_cancel_unused(struct ldlm_namespace *, const struct ldlm_res_id *, ldlm_cancel_flags_t flags, void *opaque); int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns, const struct ldlm_res_id *res_id, ldlm_policy_data_t *policy, ldlm_mode_t mode, ldlm_cancel_flags_t flags, void *opaque); int ldlm_cli_cancel_req(struct obd_export *exp, cfs_list_t *head, int count, ldlm_cancel_flags_t flags); int ldlm_cancel_resource_local(struct ldlm_resource *res, cfs_list_t *cancels, ldlm_policy_data_t *policy, ldlm_mode_t mode, __u64 lock_flags, ldlm_cancel_flags_t cancel_flags, void *opaque); int ldlm_cli_cancel_list_local(cfs_list_t *cancels, int count, ldlm_cancel_flags_t flags); int ldlm_cli_cancel_list(cfs_list_t *head, int count, struct ptlrpc_request *req, ldlm_cancel_flags_t flags); /** @} ldlm_cli_api */ /* mds/handler.c */ /* This has to be here because recursive inclusion sucks. */ int intent_disposition(struct ldlm_reply *rep, int flag); void intent_set_disposition(struct ldlm_reply *rep, int flag); /* ioctls for trying requests */ #define IOC_LDLM_TYPE 'f' #define IOC_LDLM_MIN_NR 40 #define IOC_LDLM_TEST _IOWR('f', 40, long) #define IOC_LDLM_DUMP _IOWR('f', 41, long) #define IOC_LDLM_REGRESS_START _IOWR('f', 42, long) #define IOC_LDLM_REGRESS_STOP _IOWR('f', 43, long) #define IOC_LDLM_MAX_NR 43 /** * "Modes" of acquiring lock_res, necessary to tell lockdep that taking more * than one lock_res is dead-lock safe. */ enum lock_res_type { LRT_NORMAL, LRT_NEW }; /** Lock resource. */ static inline void lock_res(struct ldlm_resource *res) { spin_lock(&res->lr_lock); } /** Lock resource with a way to instruct lockdep code about nestedness-safe. */ static inline void lock_res_nested(struct ldlm_resource *res, enum lock_res_type mode) { spin_lock_nested(&res->lr_lock, mode); } /** Unlock resource. */ static inline void unlock_res(struct ldlm_resource *res) { spin_unlock(&res->lr_lock); } /** Check if resource is already locked, assert if not. */ static inline void check_res_locked(struct ldlm_resource *res) { LASSERT(spin_is_locked(&res->lr_lock)); } struct ldlm_resource * lock_res_and_lock(struct ldlm_lock *lock); void unlock_res_and_lock(struct ldlm_lock *lock); /* ldlm_pool.c */ /** \defgroup ldlm_pools Various LDLM pool related functions * There are not used outside of ldlm. * @{ */ int ldlm_pools_recalc(ldlm_side_t client); int ldlm_pools_init(void); void ldlm_pools_fini(void); int ldlm_pool_init(struct ldlm_pool *pl, struct ldlm_namespace *ns, int idx, ldlm_side_t client); int ldlm_pool_shrink(struct ldlm_pool *pl, int nr, unsigned int gfp_mask); void ldlm_pool_fini(struct ldlm_pool *pl); int ldlm_pool_setup(struct ldlm_pool *pl, int limit); int ldlm_pool_recalc(struct ldlm_pool *pl); __u32 ldlm_pool_get_lvf(struct ldlm_pool *pl); __u64 ldlm_pool_get_slv(struct ldlm_pool *pl); __u64 ldlm_pool_get_clv(struct ldlm_pool *pl); __u32 ldlm_pool_get_limit(struct ldlm_pool *pl); void ldlm_pool_set_slv(struct ldlm_pool *pl, __u64 slv); void ldlm_pool_set_clv(struct ldlm_pool *pl, __u64 clv); void ldlm_pool_set_limit(struct ldlm_pool *pl, __u32 limit); void ldlm_pool_add(struct ldlm_pool *pl, struct ldlm_lock *lock); void ldlm_pool_del(struct ldlm_pool *pl, struct ldlm_lock *lock); /** @} */ #endif /** @} LDLM */