1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2006 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include <lustre/lustre_idl.h>
27 #include <lustre_mdt.h>
28 #include <dt_object.h>
30 #include <libcfs/list.h>
31 #include <libcfs/kp30.h>
43 * FLD (Fid Location Database) interface.
46 LUSTRE_CLI_FLD_HASH_DHT = 0,
47 LUSTRE_CLI_FLD_HASH_RRB
52 struct lu_fld_target {
53 struct list_head ft_chain;
54 struct obd_export *ft_exp;
55 struct lu_server_fld *ft_srv;
60 (*fld_hash_func_t) (struct lu_client_fld *, __u64);
62 typedef struct lu_fld_target *
63 (*fld_scan_func_t) (struct lu_client_fld *, __u64);
67 fld_hash_func_t fh_hash_func;
68 fld_scan_func_t fh_scan_func;
71 struct fld_cache_entry {
72 struct hlist_node fce_list;
73 struct list_head fce_lru;
76 cfs_waitq_t fce_waitq;
83 * Cache guard, protects fci_hash mostly because others immutable after
88 /* Cache shrink threshold */
91 /* Prefered number of cached entries */
94 /* Current number of cached entries. Protected by @fci_lock */
97 /* Hash table size (number of collision lists) */
100 /* Hash table mask */
103 /* Hash table for all collision lists */
104 struct hlist_head *fci_hash_table;
107 struct list_head fci_lru;
109 /* Cache statistics. */
110 struct fld_stats fci_stat;
112 /* Cache name used for debug and messages. */
116 struct lu_server_fld {
117 /* Fld dir proc entry. */
118 cfs_proc_dir_entry_t *lsf_proc_dir;
120 /* /fld file object device */
121 struct dt_object *lsf_obj;
123 /* Client FLD cache. */
124 struct fld_cache *lsf_cache;
126 /* Protect index modifications */
127 struct semaphore lsf_sem;
129 /* Fld service name in form "fld-srv-lustre-MDTXXX" */
134 LUSTRE_FLD_INIT = 1 << 0,
135 LUSTRE_FLD_RUN = 1 << 1
138 struct lu_client_fld {
139 /* Client side proc entry. */
140 cfs_proc_dir_entry_t *lcf_proc_dir;
142 /* List of exports client FLD knows about. */
143 struct list_head lcf_targets;
145 /* Current hash to be used to chose an export. */
146 struct lu_fld_hash *lcf_hash;
151 /* Lock protecting exports list and fld_hash. */
154 /* Client FLD cache. */
155 struct fld_cache *lcf_cache;
157 /* Client fld proc entry name. */
160 const struct lu_context *lcf_ctx;
165 int fld_query(struct com_thread_info *info);
168 int fld_server_init(struct lu_server_fld *fld,
169 struct dt_device *dt,
171 const struct lu_env *env);
173 void fld_server_fini(struct lu_server_fld *fld,
174 const struct lu_env *env);
176 int fld_server_create(struct lu_server_fld *fld,
177 const struct lu_env *env,
178 seqno_t seq, mdsno_t mds);
180 int fld_server_delete(struct lu_server_fld *fld,
181 const struct lu_env *env,
184 int fld_server_lookup(struct lu_server_fld *fld,
185 const struct lu_env *env,
186 seqno_t seq, mdsno_t *mds);
189 int fld_client_init(struct lu_client_fld *fld,
190 const char *prefix, int hash);
192 void fld_client_fini(struct lu_client_fld *fld);
194 void fld_client_flush(struct lu_client_fld *fld);
196 int fld_client_lookup(struct lu_client_fld *fld,
197 seqno_t seq, mdsno_t *mds,
198 const struct lu_env *env);
200 int fld_client_create(struct lu_client_fld *fld,
201 seqno_t seq, mdsno_t mds,
202 const struct lu_env *env);
204 int fld_client_delete(struct lu_client_fld *fld,
206 const struct lu_env *env);
208 int fld_client_add_target(struct lu_client_fld *fld,
209 struct lu_fld_target *tar);
211 int fld_client_del_target(struct lu_client_fld *fld,
215 struct fld_cache *fld_cache_init(const char *name,
218 int cache_threshold);
220 void fld_cache_fini(struct fld_cache *cache);
222 void fld_cache_flush(struct fld_cache *cache);
224 int fld_cache_insert(struct fld_cache *cache,
225 seqno_t seq, mdsno_t mds);
227 int fld_cache_insert_inflight(struct fld_cache *cache,
230 void fld_cache_delete(struct fld_cache *cache,
234 fld_cache_lookup(struct fld_cache *cache,
235 seqno_t seq, mdsno_t *mds);