1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define MAX_STRING_SIZE 128
39 extern atomic_t ldlm_srv_namespace_nr;
40 extern atomic_t ldlm_cli_namespace_nr;
41 extern struct semaphore ldlm_srv_namespace_lock;
42 extern struct list_head ldlm_srv_namespace_list;
43 extern struct semaphore ldlm_cli_namespace_lock;
44 extern struct list_head ldlm_cli_namespace_list;
46 static inline atomic_t *ldlm_namespace_nr(ldlm_side_t client)
48 return client == LDLM_NAMESPACE_SERVER ?
49 &ldlm_srv_namespace_nr : &ldlm_cli_namespace_nr;
52 static inline struct list_head *ldlm_namespace_list(ldlm_side_t client)
54 return client == LDLM_NAMESPACE_SERVER ?
55 &ldlm_srv_namespace_list : &ldlm_cli_namespace_list;
58 static inline struct semaphore *ldlm_namespace_lock(ldlm_side_t client)
60 return client == LDLM_NAMESPACE_SERVER ?
61 &ldlm_srv_namespace_lock : &ldlm_cli_namespace_lock;
70 /* Cancel lru flag, it indicates we cancel aged locks. */
72 LDLM_CANCEL_AGED = 1 << 0, /* Cancel aged locks (non lru resize). */
73 LDLM_CANCEL_PASSED = 1 << 1, /* Cancel passed number of locks. */
74 LDLM_CANCEL_SHRINK = 1 << 2, /* Cancel locks from shrinker. */
75 LDLM_CANCEL_LRUR = 1 << 3 /* Cancel locks from lru resize. */
78 int ldlm_cancel_lru(struct ldlm_namespace *ns, int nr, ldlm_sync_t sync,
80 int ldlm_cancel_lru_local(struct ldlm_namespace *ns, struct list_head *cancels,
81 int count, int max, int cancel_flags, int flags);
82 extern int ldlm_enqueue_min;
83 int ldlm_get_enq_timeout(struct ldlm_lock *lock);
86 int ldlm_resource_putref_locked(struct ldlm_resource *res);
87 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
88 struct ldlm_lock *new);
89 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
90 struct obd_import *imp, int force);
91 void ldlm_namespace_free_post(struct ldlm_namespace *ns);
95 /* Number of blocking/completion callbacks that will be sent in
96 * parallel (see bug 11301). */
97 #define PARALLEL_AST_LIMIT 200
99 struct ldlm_cb_set_arg {
100 struct ptlrpc_request_set *set;
102 __u32 type; /* LDLM_BL_CALLBACK or LDLM_CP_CALLBACK */
105 void ldlm_grant_lock(struct ldlm_lock *lock, struct list_head *work_list);
107 ldlm_lock_create(struct ldlm_namespace *ns, struct ldlm_res_id,
108 ldlm_type_t type, ldlm_mode_t, ldlm_blocking_callback,
109 ldlm_completion_callback, ldlm_glimpse_callback, void *data,
111 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *, struct ldlm_lock **,
112 void *cookie, int *flags);
113 void ldlm_lock_addref_internal(struct ldlm_lock *, __u32 mode);
114 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *, __u32 mode);
115 void ldlm_lock_decref_internal(struct ldlm_lock *, __u32 mode);
116 void ldlm_lock_decref_internal_nolock(struct ldlm_lock *, __u32 mode);
117 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
118 struct list_head *work_list);
119 int ldlm_reprocess_queue(struct ldlm_resource *res, struct list_head *queue,
120 struct list_head *work_list);
121 int ldlm_run_bl_ast_work(struct list_head *rpc_list);
122 int ldlm_run_cp_ast_work(struct list_head *rpc_list);
123 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock);
124 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock);
125 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock);
126 void ldlm_lock_add_to_lru(struct ldlm_lock *lock);
127 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock);
128 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock);
131 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
132 struct ldlm_lock *lock);
133 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
134 struct list_head *cancels, int count);
136 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
137 struct ldlm_lock_desc *ld, struct ldlm_lock *lock);
140 int ldlm_process_plain_lock(struct ldlm_lock *lock, int *flags, int first_enq,
141 ldlm_error_t *err, struct list_head *work_list);
144 int ldlm_process_extent_lock(struct ldlm_lock *lock, int *flags, int first_enq,
145 ldlm_error_t *err, struct list_head *work_list);
146 void ldlm_extent_add_lock(struct ldlm_resource *res, struct ldlm_lock *lock);
147 void ldlm_extent_unlink_lock(struct ldlm_lock *lock);
150 int ldlm_process_flock_lock(struct ldlm_lock *req, int *flags, int first_enq,
151 ldlm_error_t *err, struct list_head *work_list);
153 /* ldlm_inodebits.c */
154 int ldlm_process_inodebits_lock(struct ldlm_lock *lock, int *flags,
155 int first_enq, ldlm_error_t *err,
156 struct list_head *work_list);
159 void l_check_ns_lock(struct ldlm_namespace *ns);
160 void l_check_no_ns_lock(struct ldlm_namespace *ns);
162 extern cfs_proc_dir_entry_t *ldlm_svc_proc_dir;
163 extern cfs_proc_dir_entry_t *ldlm_type_proc_dir;
166 struct ptlrpc_service *ldlm_cb_service;
167 struct ptlrpc_service *ldlm_cancel_service;
168 struct ptlrpc_client *ldlm_client;
169 struct ptlrpc_connection *ldlm_server_conn;
170 struct ldlm_bl_pool *ldlm_bl_pool;
173 /* interval tree, for LDLM_EXTENT. */
174 extern cfs_mem_cache_t *ldlm_interval_slab; /* slab cache for ldlm_interval */
175 extern void ldlm_interval_attach(struct ldlm_interval *n, struct ldlm_lock *l);
176 extern struct ldlm_interval *ldlm_interval_detach(struct ldlm_lock *l);
177 extern struct ldlm_interval *ldlm_interval_alloc(struct ldlm_lock *lock);
178 extern void ldlm_interval_free(struct ldlm_interval *node);
179 /* this function must be called with res lock held */
180 static inline struct ldlm_extent *
181 ldlm_interval_extent(struct ldlm_interval *node)
183 struct ldlm_lock *lock;
184 LASSERT(!list_empty(&node->li_group));
186 lock = list_entry(node->li_group.next, struct ldlm_lock, l_sl_policy);
187 return &lock->l_policy_data.l_extent;
191 void ldlm_exit(void);
193 enum ldlm_policy_res {
194 LDLM_POLICY_CANCEL_LOCK,
195 LDLM_POLICY_KEEP_LOCK
198 typedef enum ldlm_policy_res ldlm_policy_res_t;
200 #define LDLM_POOL_PROC_READER(var, type) \
201 static int lprocfs_rd_##var(char *page, char **start, off_t off, \
202 int count, int *eof, void *data) \
204 struct ldlm_pool *pl = data; \
207 spin_lock(&pl->pl_lock); \
208 tmp = pl->pl_##var; \
209 spin_unlock(&pl->pl_lock); \
211 return lprocfs_rd_uint(page, start, off, count, eof, &tmp); \
213 struct __##var##__dummy_read {;} /* semicolon catcher */
215 #define LDLM_POOL_PROC_WRITER(var, type) \
216 int lprocfs_wr_##var(struct file *file, const char *buffer, \
217 unsigned long count, void *data) \
219 struct ldlm_pool *pl = data; \
223 rc = lprocfs_wr_uint(file, buffer, count, &tmp); \
225 CERROR("Can't parse user input, rc = %d\n", rc); \
229 spin_lock(&pl->pl_lock); \
230 pl->pl_##var = tmp; \
231 spin_unlock(&pl->pl_lock); \
235 struct __##var##__dummy_write {;} /* semicolon catcher */
237 static inline int is_granted_or_cancelled(struct ldlm_lock *lock)
241 lock_res_and_lock(lock);
242 if (((lock->l_req_mode == lock->l_granted_mode) &&
243 !(lock->l_flags & LDLM_FL_CP_REQD)) ||
244 (lock->l_flags & LDLM_FL_FAILED))
246 unlock_res_and_lock(lock);