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 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
  58                                struct obd_import *imp, int force);
  59 void ldlm_namespace_free_post(struct ldlm_namespace *ns);
  60 /* ldlm_lock.c */
  61
  62 /* Number of blocking/completion callbacks that will be sent in
  63  * parallel (see bug 11301). */
  64 #define PARALLEL_AST_LIMIT      200
  65
  66 struct ldlm_cb_set_arg {
  67         struct ptlrpc_request_set *set;
  68         atomic_t restart;
  69         __u32 type; /* LDLM_BL_CALLBACK or LDLM_CP_CALLBACK */
  70 };
  71
  72 typedef enum {
  73         LDLM_WORK_BL_AST,
  74         LDLM_WORK_CP_AST,
  75         LDLM_WORK_REVOKE_AST
  76 } ldlm_desc_ast_t;
  77
  78 void ldlm_grant_lock(struct ldlm_lock *lock, struct list_head *work_list);
  79 struct ldlm_lock *
  80 ldlm_lock_create(struct ldlm_namespace *ns, const struct ldlm_res_id *,
  81                  ldlm_type_t type, ldlm_mode_t, ldlm_blocking_callback,
  82                  ldlm_completion_callback, ldlm_glimpse_callback, void *data,
  83                  __u32 lvb_len);
  84 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *, struct ldlm_lock **,
  85                                void *cookie, int *flags);
  86 void ldlm_lock_addref_internal(struct ldlm_lock *, __u32 mode);
  87 void ldlm_lock_decref_internal(struct ldlm_lock *, __u32 mode);
  88 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
  89                                 struct list_head *work_list);
  90 int ldlm_reprocess_queue(struct ldlm_resource *res, struct list_head *queue,
  91                          struct list_head *work_list);
  92 int ldlm_run_ast_work(struct list_head *rpc_list, ldlm_desc_ast_t ast_type);
  93 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock);
  94 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock);
  95 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock);
  96 void ldlm_lock_add_to_lru(struct ldlm_lock *lock);
  97 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock);
  98 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock);
  99
 100 /* ldlm_lockd.c */
 101 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
 102                            struct ldlm_lock *lock);
 103 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
 104                            struct list_head *cancels, int count);
 105
 106 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
 107                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock);
 108
 109 /* ldlm_plain.c */
 110 int ldlm_process_plain_lock(struct ldlm_lock *lock, int *flags, int first_enq,
 111                             ldlm_error_t *err, struct list_head *work_list);
 112
 113 /* ldlm_extent.c */
 114 int ldlm_process_extent_lock(struct ldlm_lock *lock, int *flags, int first_enq,
 115                              ldlm_error_t *err, struct list_head *work_list);
 116 void ldlm_extent_add_lock(struct ldlm_resource *res, struct ldlm_lock *lock);
 117 void ldlm_extent_unlink_lock(struct ldlm_lock *lock);
 118
 119 /* ldlm_flock.c */
 120 int ldlm_process_flock_lock(struct ldlm_lock *req, int *flags, int first_enq,
 121                             ldlm_error_t *err, struct list_head *work_list);
 122
 123 /* ldlm_inodebits.c */
 124 int ldlm_process_inodebits_lock(struct ldlm_lock *lock, int *flags,
 125                                 int first_enq, ldlm_error_t *err,
 126                                 struct list_head *work_list);
 127
 128 /* l_lock.c */
 129 void l_check_ns_lock(struct ldlm_namespace *ns);
 130 void l_check_no_ns_lock(struct ldlm_namespace *ns);
 131
 132 extern cfs_proc_dir_entry_t *ldlm_svc_proc_dir;
 133 extern cfs_proc_dir_entry_t *ldlm_type_proc_dir;
 134
 135 struct ldlm_state {
 136         struct ptlrpc_service *ldlm_cb_service;
 137         struct ptlrpc_service *ldlm_cancel_service;
 138         struct ptlrpc_client *ldlm_client;
 139         struct ptlrpc_connection *ldlm_server_conn;
 140         struct ldlm_bl_pool *ldlm_bl_pool;
 141 };
 142
 143 /* interval tree, for LDLM_EXTENT. */
 144 extern cfs_mem_cache_t *ldlm_interval_slab; /* slab cache for ldlm_interval */
 145 extern void ldlm_interval_attach(struct ldlm_interval *n, struct ldlm_lock *l);
 146 extern struct ldlm_interval *ldlm_interval_detach(struct ldlm_lock *l);
 147 extern struct ldlm_interval *ldlm_interval_alloc(struct ldlm_lock *lock);
 148 extern void ldlm_interval_free(struct ldlm_interval *node);
 149 /* this function must be called with res lock held */
 150 static inline struct ldlm_extent *
 151 ldlm_interval_extent(struct ldlm_interval *node)
 152 {
 153         struct ldlm_lock *lock;
 154         LASSERT(!list_empty(&node->li_group));
 155
 156         lock = list_entry(node->li_group.next, struct ldlm_lock, l_sl_policy);
 157         return &lock->l_policy_data.l_extent;
 158 }
 159
 160 int ldlm_init(void);
 161 void ldlm_exit(void);
 162
 163 enum ldlm_policy_res {
 164         LDLM_POLICY_CANCEL_LOCK,
 165         LDLM_POLICY_KEEP_LOCK
 166 };
 167
 168 typedef enum ldlm_policy_res ldlm_policy_res_t;
 169
 170 #define LDLM_POOL_PROC_READER(var, type)                                    \
 171         static int lprocfs_rd_##var(char *page, char **start, off_t off,    \
 172                                     int count, int *eof, void *data)        \
 173         {                                                                   \
 174                 struct ldlm_pool *pl = data;                                \
 175                 type tmp;                                                   \
 176                                                                             \
 177                 spin_lock(&pl->pl_lock);                                    \
 178                 tmp = pl->pl_##var;                                         \
 179                 spin_unlock(&pl->pl_lock);                                  \
 180                                                                             \
 181                 return lprocfs_rd_uint(page, start, off, count, eof, &tmp); \
 182         }                                                                   \
 183         struct __##var##__dummy_read {;} /* semicolon catcher */
 184
 185 #define LDLM_POOL_PROC_WRITER(var, type)                                    \
 186         int lprocfs_wr_##var(struct file *file, const char *buffer,         \
 187                              unsigned long count, void *data)               \
 188         {                                                                   \
 189                 struct ldlm_pool *pl = data;                                \
 190                 type tmp;                                                   \
 191                 int rc;                                                     \
 192                                                                             \
 193                 rc = lprocfs_wr_uint(file, buffer, count, &tmp);            \
 194                 if (rc) {                                                   \
 195                         CERROR("Can't parse user input, rc = %d\n", rc);    \
 196                         return rc;                                          \
 197                 }                                                           \
 198                                                                             \
 199                 spin_lock(&pl->pl_lock);                                    \
 200                 pl->pl_##var = tmp;                                         \
 201                 spin_unlock(&pl->pl_lock);                                  \
 202                                                                             \
 203                 return rc;                                                  \
 204         }                                                                   \
 205         struct __##var##__dummy_write {;} /* semicolon catcher */