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 */