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[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
5 #define MAX_STRING_SIZE 128
6
7 extern atomic_t ldlm_srv_namespace_nr;
8 extern atomic_t ldlm_cli_namespace_nr;
9 extern struct semaphore ldlm_srv_namespace_lock;
10 extern struct list_head ldlm_srv_namespace_list;
11 extern struct semaphore ldlm_cli_namespace_lock;
12 extern struct list_head ldlm_cli_namespace_list;
13
14 static inline atomic_t *ldlm_namespace_nr(ldlm_side_t client)
15 {
16         return client == LDLM_NAMESPACE_SERVER ? 
17                 &ldlm_srv_namespace_nr : &ldlm_cli_namespace_nr;
18 }
19
20 static inline struct list_head *ldlm_namespace_list(ldlm_side_t client)
21 {
22         return client == LDLM_NAMESPACE_SERVER ? 
23                 &ldlm_srv_namespace_list : &ldlm_cli_namespace_list;
24 }
25
26 static inline struct semaphore *ldlm_namespace_lock(ldlm_side_t client)
27 {
28         return client == LDLM_NAMESPACE_SERVER ? 
29                 &ldlm_srv_namespace_lock : &ldlm_cli_namespace_lock;
30 }
31
32 /* ldlm_request.c */
33 typedef enum {
34         LDLM_ASYNC,
35         LDLM_SYNC,
36 } ldlm_sync_t;
37
38 /* Cancel lru flag, it indicates we cancel aged locks. */
39 enum {
40         LDLM_CANCEL_AGED   = 1 << 0, /* Cancel aged locks (non lru resize). */
41         LDLM_CANCEL_PASSED = 1 << 1, /* Cancel passed number of locks. */
42         LDLM_CANCEL_SHRINK = 1 << 2, /* Cancel locks from shrinker. */
43         LDLM_CANCEL_LRUR   = 1 << 3  /* Cancel locks from lru resize. */
44 };
45
46 int ldlm_cancel_lru(struct ldlm_namespace *ns, int nr, ldlm_sync_t sync, 
47                     int flags);
48 int ldlm_cancel_lru_local(struct ldlm_namespace *ns, struct list_head *cancels,
49                           int count, int max, int cancel_flags, int flags);
50 int ldlm_cancel_lru_estimate(struct ldlm_namespace *ns, int count, int max, 
51                              int flags);
52
53 /* ldlm_resource.c */
54 int ldlm_resource_putref_locked(struct ldlm_resource *res);
55 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
56                                      struct ldlm_lock *new);
57 int ldlm_namespace_free_prior(struct ldlm_namespace *ns);
58 int ldlm_namespace_free_post(struct ldlm_namespace *ns, int force);
59 /* ldlm_lock.c */
60
61 /* Number of blocking/completion callbacks that will be sent in
62  * parallel (see bug 11301). */
63 #define PARALLEL_AST_LIMIT      200
64
65 struct ldlm_cb_set_arg {
66         struct ptlrpc_request_set *set;
67         atomic_t restart;
68         __u32 type; /* LDLM_BL_CALLBACK or LDLM_CP_CALLBACK */
69 };
70
71 typedef enum {
72         LDLM_WORK_BL_AST,
73         LDLM_WORK_CP_AST,
74         LDLM_WORK_REVOKE_AST
75 } ldlm_desc_ast_t; 
76
77 void ldlm_grant_lock(struct ldlm_lock *lock, struct list_head *work_list);
78 struct ldlm_lock *
79 ldlm_lock_create(struct ldlm_namespace *ns, const struct ldlm_res_id *,
80                  ldlm_type_t type, ldlm_mode_t, ldlm_blocking_callback,
81                  ldlm_completion_callback, ldlm_glimpse_callback, void *data,
82                  __u32 lvb_len);
83 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *, struct ldlm_lock **,
84                                void *cookie, int *flags);
85 void ldlm_lock_addref_internal(struct ldlm_lock *, __u32 mode);
86 void ldlm_lock_decref_internal(struct ldlm_lock *, __u32 mode);
87 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
88                                 struct list_head *work_list);
89 int ldlm_reprocess_queue(struct ldlm_resource *res, struct list_head *queue,
90                          struct list_head *work_list);
91 int ldlm_run_ast_work(struct list_head *rpc_list, ldlm_desc_ast_t ast_type);
92 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock);
93 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock);
94 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock);
95 void ldlm_lock_add_to_lru(struct ldlm_lock *lock);
96 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock);
97 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock);
98
99 /* ldlm_lockd.c */
100 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
101                            struct ldlm_lock *lock);
102 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
103                            struct list_head *cancels, int count);
104
105 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
106                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock);
107
108 /* ldlm_plain.c */
109 int ldlm_process_plain_lock(struct ldlm_lock *lock, int *flags, int first_enq,
110                             ldlm_error_t *err, struct list_head *work_list);
111
112 /* ldlm_extent.c */
113 int ldlm_process_extent_lock(struct ldlm_lock *lock, int *flags, int first_enq,
114                              ldlm_error_t *err, struct list_head *work_list);
115
116 /* ldlm_flock.c */
117 int ldlm_process_flock_lock(struct ldlm_lock *req, int *flags, int first_enq,
118                             ldlm_error_t *err, struct list_head *work_list);
119
120 /* ldlm_inodebits.c */
121 int ldlm_process_inodebits_lock(struct ldlm_lock *lock, int *flags,
122                                 int first_enq, ldlm_error_t *err,
123                                 struct list_head *work_list);
124
125 /* l_lock.c */
126 void l_check_ns_lock(struct ldlm_namespace *ns);
127 void l_check_no_ns_lock(struct ldlm_namespace *ns);
128
129 extern cfs_proc_dir_entry_t *ldlm_svc_proc_dir;
130 extern cfs_proc_dir_entry_t *ldlm_type_proc_dir;
131
132 struct ldlm_state {
133         struct ptlrpc_service *ldlm_cb_service;
134         struct ptlrpc_service *ldlm_cancel_service;
135         struct ptlrpc_client *ldlm_client;
136         struct ptlrpc_connection *ldlm_server_conn;
137         struct ldlm_bl_pool *ldlm_bl_pool;
138 };
139
140 int ldlm_init(void);
141 void ldlm_exit(void);
142
143 enum ldlm_policy_res {
144         LDLM_POLICY_CANCEL_LOCK,
145         LDLM_POLICY_KEEP_LOCK
146 };
147
148 typedef enum ldlm_policy_res ldlm_policy_res_t;
149
150 #define LDLM_POOL_PROC_READER(var, type)                                    \
151         static int lprocfs_rd_##var(char *page, char **start, off_t off,    \
152                                     int count, int *eof, void *data)        \
153         {                                                                   \
154                 struct ldlm_pool *pl = data;                                \
155                 type tmp;                                                   \
156                                                                             \
157                 spin_lock(&pl->pl_lock);                                    \
158                 tmp = pl->pl_##var;                                         \
159                 spin_unlock(&pl->pl_lock);                                  \
160                                                                             \
161                 return lprocfs_rd_uint(page, start, off, count, eof, &tmp); \
162         }                                                                   \
163         struct __##var##__dummy_read {;} /* semicolon catcher */
164
165 #define LDLM_POOL_PROC_WRITER(var, type)                                    \
166         int lprocfs_wr_##var(struct file *file, const char *buffer,         \
167                              unsigned long count, void *data)               \
168         {                                                                   \
169                 struct ldlm_pool *pl = data;                                \
170                 type tmp;                                                   \
171                 int rc;                                                     \
172                                                                             \
173                 rc = lprocfs_wr_uint(file, buffer, count, &tmp);            \
174                 if (rc) {                                                   \
175                         CERROR("Can't parse user input, rc = %d\n", rc);    \
176                         return rc;                                          \
177                 }                                                           \
178                                                                             \
179                 spin_lock(&pl->pl_lock);                                    \
180                 pl->pl_##var = tmp;                                         \
181                 spin_unlock(&pl->pl_lock);                                  \
182                                                                             \
183                 return rc;                                                  \
184         }                                                                   \
185         struct __##var##__dummy_write {;} /* semicolon catcher */