lustre/ldlm/ldlm_internal.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define MAX_STRING_SIZE 128
  38
  39 extern int ldlm_srv_namespace_nr;
  40 extern int ldlm_cli_namespace_nr;
  41 extern struct mutex ldlm_srv_namespace_lock;
  42 extern struct list_head ldlm_srv_namespace_list;
  43 extern struct mutex ldlm_cli_namespace_lock;
  44 extern struct list_head ldlm_cli_active_namespace_list;
  45 extern struct list_head ldlm_cli_inactive_namespace_list;
  46 extern unsigned int ldlm_cancel_unused_locks_before_replay;
  47
  48 static inline int ldlm_namespace_nr_read(ldlm_side_t client)
  49 {
  50         return client == LDLM_NAMESPACE_SERVER ?
  51                 ldlm_srv_namespace_nr : ldlm_cli_namespace_nr;
  52 }
  53
  54 static inline void ldlm_namespace_nr_inc(ldlm_side_t client)
  55 {
  56         if (client == LDLM_NAMESPACE_SERVER)
  57                 ldlm_srv_namespace_nr++;
  58         else
  59                 ldlm_cli_namespace_nr++;
  60 }
  61
  62 static inline void ldlm_namespace_nr_dec(ldlm_side_t client)
  63 {
  64         if (client == LDLM_NAMESPACE_SERVER)
  65                 ldlm_srv_namespace_nr--;
  66         else
  67                 ldlm_cli_namespace_nr--;
  68 }
  69
  70 static inline struct list_head *ldlm_namespace_list(ldlm_side_t client)
  71 {
  72         return client == LDLM_NAMESPACE_SERVER ?
  73                 &ldlm_srv_namespace_list : &ldlm_cli_active_namespace_list;
  74 }
  75
  76 static inline struct list_head *ldlm_namespace_inactive_list(ldlm_side_t client)
  77 {
  78         return client == LDLM_NAMESPACE_SERVER ?
  79                 &ldlm_srv_namespace_list : &ldlm_cli_inactive_namespace_list;
  80 }
  81
  82 static inline struct mutex *ldlm_namespace_lock(ldlm_side_t client)
  83 {
  84         return client == LDLM_NAMESPACE_SERVER ?
  85                 &ldlm_srv_namespace_lock : &ldlm_cli_namespace_lock;
  86 }
  87
  88 /* ns_bref is the number of resources in this namespace */
  89 static inline int ldlm_ns_empty(struct ldlm_namespace *ns)
  90 {
  91         return atomic_read(&ns->ns_bref) == 0;
  92 }
  93
  94 void ldlm_namespace_move_to_active_locked(struct ldlm_namespace *, ldlm_side_t);
  95 void ldlm_namespace_move_to_inactive_locked(struct ldlm_namespace *, ldlm_side_t);
  96 struct ldlm_namespace *ldlm_namespace_first_locked(ldlm_side_t);
  97
  98 /* ldlm_request.c */
  99 /* Cancel lru flag, it indicates we cancel aged locks. */
 100 enum {
 101         LDLM_CANCEL_AGED   = 1 << 0, /* Cancel aged locks (non lru resize). */
 102         LDLM_CANCEL_PASSED = 1 << 1, /* Cancel passed number of locks. */
 103         LDLM_CANCEL_SHRINK = 1 << 2, /* Cancel locks from shrinker. */
 104         LDLM_CANCEL_LRUR   = 1 << 3, /* Cancel locks from lru resize. */
 105         LDLM_CANCEL_NO_WAIT = 1 << 4,/* Cancel locks w/o blocking (neither
 106                                       * sending nor waiting for any rpcs) */
 107         LDLM_CANCEL_LRUR_NO_WAIT = 1 << 5, /* LRUR + NO_WAIT */
 108 };
 109
 110 int ldlm_cancel_lru(struct ldlm_namespace *ns, int nr,
 111                     ldlm_cancel_flags_t sync, int flags);
 112 int ldlm_cancel_lru_local(struct ldlm_namespace *ns,
 113                           struct list_head *cancels, int count, int max,
 114                           ldlm_cancel_flags_t cancel_flags, int flags);
 115 extern unsigned int ldlm_enqueue_min;
 116 /* ldlm_resource.c */
 117 extern struct kmem_cache *ldlm_resource_slab;
 118 extern struct kmem_cache *ldlm_lock_slab;
 119
 120 int ldlm_resource_putref_locked(struct ldlm_resource *res);
 121 void ldlm_resource_insert_lock_after(struct ldlm_lock *original,
 122                                      struct ldlm_lock *new);
 123 void ldlm_namespace_free_prior(struct ldlm_namespace *ns,
 124                                struct obd_import *imp, int force);
 125 void ldlm_namespace_free_post(struct ldlm_namespace *ns);
 126
 127 /* ldlm_lock.c */
 128
 129 struct ldlm_cb_set_arg {
 130         struct ptlrpc_request_set       *set;
 131         int                              type; /* LDLM_{CP,BL,GL}_CALLBACK */
 132         atomic_t                         restart;
 133         struct list_head                        *list;
 134         union ldlm_gl_desc              *gl_desc; /* glimpse AST descriptor */
 135 };
 136
 137 typedef enum {
 138         LDLM_WORK_BL_AST,
 139         LDLM_WORK_CP_AST,
 140         LDLM_WORK_REVOKE_AST,
 141         LDLM_WORK_GL_AST
 142 } ldlm_desc_ast_t;
 143
 144 void ldlm_grant_lock(struct ldlm_lock *lock, struct list_head *work_list);
 145 int ldlm_fill_lvb(struct ldlm_lock *lock, struct req_capsule *pill,
 146                   enum req_location loc, void *data, int size);
 147 struct ldlm_lock *
 148 ldlm_lock_create(struct ldlm_namespace *ns, const struct ldlm_res_id *,
 149                  ldlm_type_t type, ldlm_mode_t,
 150                  const struct ldlm_callback_suite *cbs,
 151                  void *data, __u32 lvb_len, enum lvb_type lvb_type);
 152 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *, struct ldlm_lock **,
 153                                void *cookie, __u64 *flags);
 154 void ldlm_lock_addref_internal(struct ldlm_lock *, __u32 mode);
 155 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *, __u32 mode);
 156 void ldlm_lock_decref_internal(struct ldlm_lock *, __u32 mode);
 157 void ldlm_lock_decref_internal_nolock(struct ldlm_lock *, __u32 mode);
 158 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 159                             struct list_head *work_list);
 160 #ifdef HAVE_SERVER_SUPPORT
 161 int ldlm_reprocess_queue(struct ldlm_resource *res, struct list_head *queue,
 162                          struct list_head *work_list);
 163 #endif
 164 int ldlm_run_ast_work(struct ldlm_namespace *ns, struct list_head *rpc_list,
 165                       ldlm_desc_ast_t ast_type);
 166 int ldlm_work_gl_ast_lock(struct ptlrpc_request_set *rqset, void *opaq);
 167 int ldlm_lock_remove_from_lru_check(struct ldlm_lock *lock,
 168                                     cfs_time_t last_use);
 169 #define ldlm_lock_remove_from_lru(lock) ldlm_lock_remove_from_lru_check(lock, 0)
 170 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock);
 171 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock);
 172 void ldlm_lock_add_to_lru(struct ldlm_lock *lock);
 173 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock);
 174 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock);
 175
 176 void ldlm_cancel_locks_for_export(struct obd_export *export);
 177
 178 /* ldlm_lockd.c */
 179 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
 180                            struct ldlm_lock *lock);
 181 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns,
 182                            struct ldlm_lock_desc *ld,
 183                            struct list_head *cancels, int count,
 184                            ldlm_cancel_flags_t cancel_flags);
 185
 186 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
 187                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock);
 188
 189 #ifdef HAVE_SERVER_SUPPORT
 190 /* ldlm_plain.c */
 191 int ldlm_process_plain_lock(struct ldlm_lock *lock, __u64 *flags,
 192                             int first_enq, ldlm_error_t *err,
 193                             struct list_head *work_list);
 194
 195 /* ldlm_inodebits.c */
 196 int ldlm_process_inodebits_lock(struct ldlm_lock *lock, __u64 *flags,
 197                                 int first_enq, ldlm_error_t *err,
 198                                 struct list_head *work_list);
 199 #endif
 200
 201 /* ldlm_extent.c */
 202 #ifdef HAVE_SERVER_SUPPORT
 203 int ldlm_process_extent_lock(struct ldlm_lock *lock, __u64 *flags,
 204                              int first_enq, ldlm_error_t *err,
 205                              struct list_head *work_list);
 206 #endif
 207 void ldlm_extent_add_lock(struct ldlm_resource *res, struct ldlm_lock *lock);
 208 void ldlm_extent_unlink_lock(struct ldlm_lock *lock);
 209
 210 /* ldlm_flock.c */
 211 int ldlm_process_flock_lock(struct ldlm_lock *req, __u64 *flags,
 212                             int first_enq, ldlm_error_t *err,
 213                             struct list_head *work_list);
 214 int ldlm_init_flock_export(struct obd_export *exp);
 215 void ldlm_destroy_flock_export(struct obd_export *exp);
 216
 217 /* l_lock.c */
 218 void l_check_ns_lock(struct ldlm_namespace *ns);
 219 void l_check_no_ns_lock(struct ldlm_namespace *ns);
 220
 221 extern struct proc_dir_entry *ldlm_svc_proc_dir;
 222
 223 struct ldlm_state {
 224         struct ptlrpc_service *ldlm_cb_service;
 225         struct ptlrpc_service *ldlm_cancel_service;
 226         struct ptlrpc_client *ldlm_client;
 227         struct ptlrpc_connection *ldlm_server_conn;
 228         struct ldlm_bl_pool *ldlm_bl_pool;
 229 };
 230
 231 /* interval tree, for LDLM_EXTENT. */
 232 extern struct kmem_cache *ldlm_interval_slab; /* slab cache for ldlm_interval */
 233 extern void ldlm_interval_attach(struct ldlm_interval *n, struct ldlm_lock *l);
 234 extern struct ldlm_interval *ldlm_interval_detach(struct ldlm_lock *l);
 235 extern struct ldlm_interval *ldlm_interval_alloc(struct ldlm_lock *lock);
 236 extern void ldlm_interval_free(struct ldlm_interval *node);
 237 /* this function must be called with res lock held */
 238 static inline struct ldlm_extent *
 239 ldlm_interval_extent(struct ldlm_interval *node)
 240 {
 241         struct ldlm_lock *lock;
 242         LASSERT(!list_empty(&node->li_group));
 243
 244         lock = list_entry(node->li_group.next, struct ldlm_lock,
 245                               l_sl_policy);
 246         return &lock->l_policy_data.l_extent;
 247 }
 248
 249 int ldlm_init(void);
 250 void ldlm_exit(void);
 251
 252 enum ldlm_policy_res {
 253         LDLM_POLICY_CANCEL_LOCK,
 254         LDLM_POLICY_KEEP_LOCK,
 255         LDLM_POLICY_SKIP_LOCK
 256 };
 257
 258 typedef enum ldlm_policy_res ldlm_policy_res_t;
 259
 260 #define LDLM_POOL_PROC_READER_SEQ_SHOW(var, type)                       \
 261         static int lprocfs_##var##_seq_show(struct seq_file *m, void *v)\
 262         {                                                               \
 263                 struct ldlm_pool *pl = m->private;                      \
 264                 type tmp;                                               \
 265                                                                         \
 266                 spin_lock(&pl->pl_lock);                                \
 267                 tmp = pl->pl_##var;                                     \
 268                 spin_unlock(&pl->pl_lock);                              \
 269                                                                         \
 270                 return lprocfs_uint_seq_show(m, &tmp);                  \
 271         }                                                               \
 272         struct __##var##__dummy_read {;} /* semicolon catcher */
 273
 274 #define LDLM_POOL_PROC_WRITER(var, type)                                \
 275         static int lprocfs_wr_##var(struct file *file,                  \
 276                              const char __user *buffer,                 \
 277                              unsigned long count, void *data)           \
 278         {                                                               \
 279                 struct ldlm_pool *pl = data;                            \
 280                 type tmp;                                               \
 281                 int rc;                                                 \
 282                                                                         \
 283                 rc = lprocfs_wr_uint(file, buffer, count, &tmp);        \
 284                 if (rc < 0) {                                           \
 285                         CERROR("Can't parse user input, rc = %d\n", rc);\
 286                         return rc;                                      \
 287                 }                                                       \
 288                                                                         \
 289                 spin_lock(&pl->pl_lock);                                \
 290                 pl->pl_##var = tmp;                                     \
 291                 spin_unlock(&pl->pl_lock);                              \
 292                                                                         \
 293                 return rc;                                              \
 294         }                                                               \
 295         struct __##var##__dummy_write {;} /* semicolon catcher */
 296
 297 static inline void
 298 ldlm_add_var(struct lprocfs_vars *vars, struct proc_dir_entry *proc_dir,
 299              const char *name, void *data, const struct file_operations *ops)
 300 {
 301         snprintf((char *)vars->name, MAX_STRING_SIZE, "%s", name);
 302         vars->data = data;
 303         vars->fops = ops;
 304         lprocfs_add_vars(proc_dir, vars, NULL);
 305 }
 306
 307 static inline int is_granted_or_cancelled(struct ldlm_lock *lock)
 308 {
 309         int ret = 0;
 310
 311         lock_res_and_lock(lock);
 312         if ((lock->l_req_mode == lock->l_granted_mode) &&
 313              !ldlm_is_cp_reqd(lock))
 314                 ret = 1;
 315         else if (ldlm_is_failed(lock) || ldlm_is_cancel(lock))
 316                 ret = 1;
 317         unlock_res_and_lock(lock);
 318
 319         return ret;
 320 }
 321
 322 typedef void (*ldlm_policy_wire_to_local_t)(const ldlm_wire_policy_data_t *,
 323                                             ldlm_policy_data_t *);
 324
 325 typedef void (*ldlm_policy_local_to_wire_t)(const ldlm_policy_data_t *,
 326                                             ldlm_wire_policy_data_t *);
 327
 328 void ldlm_plain_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
 329                                      ldlm_policy_data_t *lpolicy);
 330 void ldlm_plain_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
 331                                      ldlm_wire_policy_data_t *wpolicy);
 332 void ldlm_ibits_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
 333                                      ldlm_policy_data_t *lpolicy);
 334 void ldlm_ibits_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
 335                                      ldlm_wire_policy_data_t *wpolicy);
 336 void ldlm_extent_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
 337                                      ldlm_policy_data_t *lpolicy);
 338 void ldlm_extent_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
 339                                      ldlm_wire_policy_data_t *wpolicy);
 340 void ldlm_flock_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
 341                                      ldlm_policy_data_t *lpolicy);
 342
 343 void ldlm_flock_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
 344                                      ldlm_wire_policy_data_t *wpolicy);