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LU-571 ldlm: Remove parallel AST limitation
[fs/lustre-release.git] / lustre / ldlm / ldlm_internal.h
1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=8:tabstop=8:
3  *
4  * GPL HEADER START
5  *
6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7  *
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.
11  *
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).
17  *
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
21  *
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
24  * have any questions.
25  *
26  * GPL HEADER END
27  */
28 /*
29  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
30  * Use is subject to license terms.
31  *
32  * Copyright (c) 2011 Whamcloud, Inc.
33  *
34  */
35 /*
36  * This file is part of Lustre, http://www.lustre.org/
37  * Lustre is a trademark of Sun Microsystems, Inc.
38  */
39
40 #define MAX_STRING_SIZE 128
41
42 extern cfs_atomic_t ldlm_srv_namespace_nr;
43 extern cfs_atomic_t ldlm_cli_namespace_nr;
44 extern cfs_semaphore_t ldlm_srv_namespace_lock;
45 extern cfs_list_t ldlm_srv_namespace_list;
46 extern cfs_semaphore_t ldlm_cli_namespace_lock;
47 extern cfs_list_t ldlm_cli_namespace_list;
48
49 static inline cfs_atomic_t *ldlm_namespace_nr(ldlm_side_t client)
50 {
51         return client == LDLM_NAMESPACE_SERVER ?
52                 &ldlm_srv_namespace_nr : &ldlm_cli_namespace_nr;
53 }
54
55 static inline cfs_list_t *ldlm_namespace_list(ldlm_side_t client)
56 {
57         return client == LDLM_NAMESPACE_SERVER ?
58                 &ldlm_srv_namespace_list : &ldlm_cli_namespace_list;
59 }
60
61 static inline cfs_semaphore_t *ldlm_namespace_lock(ldlm_side_t client)
62 {
63         return client == LDLM_NAMESPACE_SERVER ?
64                 &ldlm_srv_namespace_lock : &ldlm_cli_namespace_lock;
65 }
66
67 /* ldlm_request.c */
68 typedef enum {
69         LDLM_ASYNC,
70         LDLM_SYNC,
71 } ldlm_sync_t;
72
73 /* Cancel lru flag, it indicates we cancel aged locks. */
74 enum {
75         LDLM_CANCEL_AGED   = 1 << 0, /* Cancel aged locks (non lru resize). */
76         LDLM_CANCEL_PASSED = 1 << 1, /* Cancel passed number of locks. */
77         LDLM_CANCEL_SHRINK = 1 << 2, /* Cancel locks from shrinker. */
78         LDLM_CANCEL_LRUR   = 1 << 3, /* Cancel locks from lru resize. */
79         LDLM_CANCEL_NO_WAIT = 1 << 4 /* Cancel locks w/o blocking (neither
80                                       * sending nor waiting for any rpcs) */
81 };
82
83 int ldlm_cancel_lru(struct ldlm_namespace *ns, int nr, ldlm_sync_t sync,
84                     int flags);
85 int ldlm_cancel_lru_local(struct ldlm_namespace *ns,
86                           cfs_list_t *cancels, int count, int max,
87                           ldlm_cancel_flags_t cancel_flags, int flags);
88 extern int ldlm_enqueue_min;
89 int ldlm_get_enq_timeout(struct ldlm_lock *lock);
90
91 /* ldlm_resource.c */
92 int ldlm_resource_putref_locked(struct ldlm_resource *res);
93 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
94                                      struct ldlm_lock *new);
95 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
96                                struct obd_import *imp, int force);
97 void ldlm_namespace_free_post(struct ldlm_namespace *ns);
98 /* ldlm_lock.c */
99
100 struct ldlm_cb_set_arg {
101         struct ptlrpc_request_set *set;
102         cfs_atomic_t    restart;
103         int             type;  /* LDLM_BL_CALLBACK or LDLM_CP_CALLBACK */
104         int             rpcs;  /* # of rpcs in set */
105 };
106
107 typedef enum {
108         LDLM_WORK_BL_AST,
109         LDLM_WORK_CP_AST,
110         LDLM_WORK_REVOKE_AST
111 } ldlm_desc_ast_t;
112
113 void ldlm_grant_lock(struct ldlm_lock *lock, cfs_list_t *work_list);
114 struct ldlm_lock *
115 ldlm_lock_create(struct ldlm_namespace *ns, const struct ldlm_res_id *,
116                  ldlm_type_t type, ldlm_mode_t,
117                  const struct ldlm_callback_suite *cbs,
118                  void *data, __u32 lvb_len);
119 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *, struct ldlm_lock **,
120                                void *cookie, int *flags);
121 void ldlm_lock_addref_internal(struct ldlm_lock *, __u32 mode);
122 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *, __u32 mode);
123 void ldlm_lock_decref_internal(struct ldlm_lock *, __u32 mode);
124 void ldlm_lock_decref_internal_nolock(struct ldlm_lock *, __u32 mode);
125 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
126                             cfs_list_t *work_list);
127 int ldlm_reprocess_queue(struct ldlm_resource *res, cfs_list_t *queue,
128                          cfs_list_t *work_list);
129 int ldlm_run_ast_work(struct ldlm_namespace *ns, cfs_list_t *rpc_list,
130                       ldlm_desc_ast_t ast_type);
131 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock);
132 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock);
133 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock);
134 void ldlm_lock_add_to_lru(struct ldlm_lock *lock);
135 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock);
136 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock);
137
138 void ldlm_cancel_locks_for_export(struct obd_export *export);
139
140 /* ldlm_lockd.c */
141 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
142                            struct ldlm_lock *lock);
143 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
144                            cfs_list_t *cancels, int count, int mode);
145
146 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
147                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock);
148
149 /* ldlm_plain.c */
150 int ldlm_process_plain_lock(struct ldlm_lock *lock, int *flags, int first_enq,
151                             ldlm_error_t *err, cfs_list_t *work_list);
152
153 /* ldlm_extent.c */
154 int ldlm_process_extent_lock(struct ldlm_lock *lock, int *flags, int first_enq,
155                              ldlm_error_t *err, cfs_list_t *work_list);
156 void ldlm_extent_add_lock(struct ldlm_resource *res, struct ldlm_lock *lock);
157 void ldlm_extent_unlink_lock(struct ldlm_lock *lock);
158
159 /* ldlm_flock.c */
160 int ldlm_process_flock_lock(struct ldlm_lock *req, int *flags, int first_enq,
161                             ldlm_error_t *err, cfs_list_t *work_list);
162
163 /* ldlm_inodebits.c */
164 int ldlm_process_inodebits_lock(struct ldlm_lock *lock, int *flags,
165                                 int first_enq, ldlm_error_t *err,
166                                 cfs_list_t *work_list);
167
168 /* l_lock.c */
169 void l_check_ns_lock(struct ldlm_namespace *ns);
170 void l_check_no_ns_lock(struct ldlm_namespace *ns);
171
172 extern cfs_proc_dir_entry_t *ldlm_svc_proc_dir;
173 extern cfs_proc_dir_entry_t *ldlm_type_proc_dir;
174
175 struct ldlm_state {
176         struct ptlrpc_service *ldlm_cb_service;
177         struct ptlrpc_service *ldlm_cancel_service;
178         struct ptlrpc_client *ldlm_client;
179         struct ptlrpc_connection *ldlm_server_conn;
180         struct ldlm_bl_pool *ldlm_bl_pool;
181 };
182
183 /* interval tree, for LDLM_EXTENT. */
184 extern cfs_mem_cache_t *ldlm_interval_slab; /* slab cache for ldlm_interval */
185 extern void ldlm_interval_attach(struct ldlm_interval *n, struct ldlm_lock *l);
186 extern struct ldlm_interval *ldlm_interval_detach(struct ldlm_lock *l);
187 extern struct ldlm_interval *ldlm_interval_alloc(struct ldlm_lock *lock);
188 extern void ldlm_interval_free(struct ldlm_interval *node);
189 /* this function must be called with res lock held */
190 static inline struct ldlm_extent *
191 ldlm_interval_extent(struct ldlm_interval *node)
192 {
193         struct ldlm_lock *lock;
194         LASSERT(!cfs_list_empty(&node->li_group));
195
196         lock = cfs_list_entry(node->li_group.next, struct ldlm_lock,
197                               l_sl_policy);
198         return &lock->l_policy_data.l_extent;
199 }
200
201 int ldlm_init(void);
202 void ldlm_exit(void);
203
204 enum ldlm_policy_res {
205         LDLM_POLICY_CANCEL_LOCK,
206         LDLM_POLICY_KEEP_LOCK,
207         LDLM_POLICY_SKIP_LOCK
208 };
209
210 typedef enum ldlm_policy_res ldlm_policy_res_t;
211
212 #define LDLM_POOL_PROC_READER(var, type)                                    \
213         static int lprocfs_rd_##var(char *page, char **start, off_t off,    \
214                                     int count, int *eof, void *data)        \
215         {                                                                   \
216                 struct ldlm_pool *pl = data;                                \
217                 type tmp;                                                   \
218                                                                             \
219                 cfs_spin_lock(&pl->pl_lock);                                \
220                 tmp = pl->pl_##var;                                         \
221                 cfs_spin_unlock(&pl->pl_lock);                              \
222                                                                             \
223                 return lprocfs_rd_uint(page, start, off, count, eof, &tmp); \
224         }                                                                   \
225         struct __##var##__dummy_read {;} /* semicolon catcher */
226
227 #define LDLM_POOL_PROC_WRITER(var, type)                                    \
228         int lprocfs_wr_##var(struct file *file, const char *buffer,         \
229                              unsigned long count, void *data)               \
230         {                                                                   \
231                 struct ldlm_pool *pl = data;                                \
232                 type tmp;                                                   \
233                 int rc;                                                     \
234                                                                             \
235                 rc = lprocfs_wr_uint(file, buffer, count, &tmp);            \
236                 if (rc < 0) {                                               \
237                         CERROR("Can't parse user input, rc = %d\n", rc);    \
238                         return rc;                                          \
239                 }                                                           \
240                                                                             \
241                 cfs_spin_lock(&pl->pl_lock);                                \
242                 pl->pl_##var = tmp;                                         \
243                 cfs_spin_unlock(&pl->pl_lock);                              \
244                                                                             \
245                 return rc;                                                  \
246         }                                                                   \
247         struct __##var##__dummy_write {;} /* semicolon catcher */
248
249 static inline int is_granted_or_cancelled(struct ldlm_lock *lock)
250 {
251         int ret = 0;
252
253         lock_res_and_lock(lock);
254         if (((lock->l_req_mode == lock->l_granted_mode) &&
255              !(lock->l_flags & LDLM_FL_CP_REQD)) ||
256             (lock->l_flags & LDLM_FL_FAILED))
257                 ret = 1;
258         unlock_res_and_lock(lock);
259
260         return ret;
261 }
262
263 typedef void (*ldlm_policy_wire_to_local_t)(const ldlm_wire_policy_data_t *,
264                                             ldlm_policy_data_t *);
265
266 typedef void (*ldlm_policy_local_to_wire_t)(const ldlm_policy_data_t *,
267                                             ldlm_wire_policy_data_t *);
268
269 void ldlm_plain_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
270                                      ldlm_policy_data_t *lpolicy);
271 void ldlm_plain_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
272                                      ldlm_wire_policy_data_t *wpolicy);
273 void ldlm_ibits_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
274                                      ldlm_policy_data_t *lpolicy);
275 void ldlm_ibits_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
276                                      ldlm_wire_policy_data_t *wpolicy);
277 void ldlm_extent_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
278                                      ldlm_policy_data_t *lpolicy);
279 void ldlm_extent_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
280                                      ldlm_wire_policy_data_t *wpolicy);
281 void ldlm_flock_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
282                                      ldlm_policy_data_t *lpolicy);
283 void ldlm_flock_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
284                                      ldlm_wire_policy_data_t *wpolicy);