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 /* Number of blocking/completion callbacks that will be sent in
 101  * parallel (see bug 11301). */
 102 #define PARALLEL_AST_LIMIT      200
 103
 104 struct ldlm_cb_set_arg {
 105         struct ptlrpc_request_set *set;
 106         cfs_atomic_t restart;
 107         __u32 type; /* LDLM_BL_CALLBACK or LDLM_CP_CALLBACK */
 108 };
 109
 110 typedef enum {
 111         LDLM_WORK_BL_AST,
 112         LDLM_WORK_CP_AST,
 113         LDLM_WORK_REVOKE_AST
 114 } ldlm_desc_ast_t;
 115
 116 void ldlm_grant_lock(struct ldlm_lock *lock, cfs_list_t *work_list);
 117 struct ldlm_lock *
 118 ldlm_lock_create(struct ldlm_namespace *ns, const struct ldlm_res_id *,
 119                  ldlm_type_t type, ldlm_mode_t,
 120                  const struct ldlm_callback_suite *cbs,
 121                  void *data, __u32 lvb_len);
 122 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *, struct ldlm_lock **,
 123                                void *cookie, int *flags);
 124 void ldlm_lock_addref_internal(struct ldlm_lock *, __u32 mode);
 125 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *, __u32 mode);
 126 void ldlm_lock_decref_internal(struct ldlm_lock *, __u32 mode);
 127 void ldlm_lock_decref_internal_nolock(struct ldlm_lock *, __u32 mode);
 128 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 129                             cfs_list_t *work_list);
 130 int ldlm_reprocess_queue(struct ldlm_resource *res, cfs_list_t *queue,
 131                          cfs_list_t *work_list);
 132 int ldlm_run_ast_work(cfs_list_t *rpc_list, ldlm_desc_ast_t ast_type);
 133 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock);
 134 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock);
 135 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock);
 136 void ldlm_lock_add_to_lru(struct ldlm_lock *lock);
 137 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock);
 138 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock);
 139
 140 void ldlm_cancel_locks_for_export(struct obd_export *export);
 141
 142 /* ldlm_lockd.c */
 143 int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
 144                            struct ldlm_lock *lock);
 145 int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
 146                            cfs_list_t *cancels, int count, int mode);
 147
 148 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
 149                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock);
 150
 151 /* ldlm_plain.c */
 152 int ldlm_process_plain_lock(struct ldlm_lock *lock, int *flags, int first_enq,
 153                             ldlm_error_t *err, cfs_list_t *work_list);
 154
 155 /* ldlm_extent.c */
 156 int ldlm_process_extent_lock(struct ldlm_lock *lock, int *flags, int first_enq,
 157                              ldlm_error_t *err, cfs_list_t *work_list);
 158 void ldlm_extent_add_lock(struct ldlm_resource *res, struct ldlm_lock *lock);
 159 void ldlm_extent_unlink_lock(struct ldlm_lock *lock);
 160
 161 /* ldlm_flock.c */
 162 int ldlm_process_flock_lock(struct ldlm_lock *req, int *flags, int first_enq,
 163                             ldlm_error_t *err, cfs_list_t *work_list);
 164
 165 /* ldlm_inodebits.c */
 166 int ldlm_process_inodebits_lock(struct ldlm_lock *lock, int *flags,
 167                                 int first_enq, ldlm_error_t *err,
 168                                 cfs_list_t *work_list);
 169
 170 /* l_lock.c */
 171 void l_check_ns_lock(struct ldlm_namespace *ns);
 172 void l_check_no_ns_lock(struct ldlm_namespace *ns);
 173
 174 extern cfs_proc_dir_entry_t *ldlm_svc_proc_dir;
 175 extern cfs_proc_dir_entry_t *ldlm_type_proc_dir;
 176
 177 struct ldlm_state {
 178         struct ptlrpc_service *ldlm_cb_service;
 179         struct ptlrpc_service *ldlm_cancel_service;
 180         struct ptlrpc_client *ldlm_client;
 181         struct ptlrpc_connection *ldlm_server_conn;
 182         struct ldlm_bl_pool *ldlm_bl_pool;
 183 };
 184
 185 /* interval tree, for LDLM_EXTENT. */
 186 extern cfs_mem_cache_t *ldlm_interval_slab; /* slab cache for ldlm_interval */
 187 extern void ldlm_interval_attach(struct ldlm_interval *n, struct ldlm_lock *l);
 188 extern struct ldlm_interval *ldlm_interval_detach(struct ldlm_lock *l);
 189 extern struct ldlm_interval *ldlm_interval_alloc(struct ldlm_lock *lock);
 190 extern void ldlm_interval_free(struct ldlm_interval *node);
 191 /* this function must be called with res lock held */
 192 static inline struct ldlm_extent *
 193 ldlm_interval_extent(struct ldlm_interval *node)
 194 {
 195         struct ldlm_lock *lock;
 196         LASSERT(!cfs_list_empty(&node->li_group));
 197
 198         lock = cfs_list_entry(node->li_group.next, struct ldlm_lock,
 199                               l_sl_policy);
 200         return &lock->l_policy_data.l_extent;
 201 }
 202
 203 int ldlm_init(void);
 204 void ldlm_exit(void);
 205
 206 enum ldlm_policy_res {
 207         LDLM_POLICY_CANCEL_LOCK,
 208         LDLM_POLICY_KEEP_LOCK,
 209         LDLM_POLICY_SKIP_LOCK
 210 };
 211
 212 typedef enum ldlm_policy_res ldlm_policy_res_t;
 213
 214 #define LDLM_POOL_PROC_READER(var, type)                                    \
 215         static int lprocfs_rd_##var(char *page, char **start, off_t off,    \
 216                                     int count, int *eof, void *data)        \
 217         {                                                                   \
 218                 struct ldlm_pool *pl = data;                                \
 219                 type tmp;                                                   \
 220                                                                             \
 221                 cfs_spin_lock(&pl->pl_lock);                                \
 222                 tmp = pl->pl_##var;                                         \
 223                 cfs_spin_unlock(&pl->pl_lock);                              \
 224                                                                             \
 225                 return lprocfs_rd_uint(page, start, off, count, eof, &tmp); \
 226         }                                                                   \
 227         struct __##var##__dummy_read {;} /* semicolon catcher */
 228
 229 #define LDLM_POOL_PROC_WRITER(var, type)                                    \
 230         int lprocfs_wr_##var(struct file *file, const char *buffer,         \
 231                              unsigned long count, void *data)               \
 232         {                                                                   \
 233                 struct ldlm_pool *pl = data;                                \
 234                 type tmp;                                                   \
 235                 int rc;                                                     \
 236                                                                             \
 237                 rc = lprocfs_wr_uint(file, buffer, count, &tmp);            \
 238                 if (rc < 0) {                                               \
 239                         CERROR("Can't parse user input, rc = %d\n", rc);    \
 240                         return rc;                                          \
 241                 }                                                           \
 242                                                                             \
 243                 cfs_spin_lock(&pl->pl_lock);                                \
 244                 pl->pl_##var = tmp;                                         \
 245                 cfs_spin_unlock(&pl->pl_lock);                              \
 246                                                                             \
 247                 return rc;                                                  \
 248         }                                                                   \
 249         struct __##var##__dummy_write {;} /* semicolon catcher */
 250
 251 static inline int is_granted_or_cancelled(struct ldlm_lock *lock)
 252 {
 253         int ret = 0;
 254
 255         lock_res_and_lock(lock);
 256         if (((lock->l_req_mode == lock->l_granted_mode) &&
 257              !(lock->l_flags & LDLM_FL_CP_REQD)) ||
 258             (lock->l_flags & LDLM_FL_FAILED))
 259                 ret = 1;
 260         unlock_res_and_lock(lock);
 261
 262         return ret;
 263 }
 264
 265 typedef void (*ldlm_policy_wire_to_local_t)(const ldlm_wire_policy_data_t *,
 266                                             ldlm_policy_data_t *);
 267
 268 typedef void (*ldlm_policy_local_to_wire_t)(const ldlm_policy_data_t *,
 269                                             ldlm_wire_policy_data_t *);
 270
 271 void ldlm_plain_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
 272                                      ldlm_policy_data_t *lpolicy);
 273 void ldlm_plain_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
 274                                      ldlm_wire_policy_data_t *wpolicy);
 275 void ldlm_ibits_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
 276                                      ldlm_policy_data_t *lpolicy);
 277 void ldlm_ibits_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
 278                                      ldlm_wire_policy_data_t *wpolicy);
 279 void ldlm_extent_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
 280                                      ldlm_policy_data_t *lpolicy);
 281 void ldlm_extent_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
 282                                      ldlm_wire_policy_data_t *wpolicy);
 283 void ldlm_flock_policy_wire_to_local(const ldlm_wire_policy_data_t *wpolicy,
 284                                      ldlm_policy_data_t *lpolicy);
 285 void ldlm_flock_policy_local_to_wire(const ldlm_policy_data_t *lpolicy,
 286                                      ldlm_wire_policy_data_t *wpolicy);