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>
42 * FLD (Fid Location Database) interface.
45 LUSTRE_CLI_FLD_HASH_DHT = 0,
46 LUSTRE_CLI_FLD_HASH_RRB
51 struct lu_fld_target {
52 struct list_head ft_chain;
53 struct obd_export *ft_exp;
54 struct lu_server_fld *ft_srv;
59 (*fld_hash_func_t) (struct lu_client_fld *, __u64);
61 typedef struct lu_fld_target *
62 (*fld_scan_func_t) (struct lu_client_fld *, __u64);
66 fld_hash_func_t fh_hash_func;
67 fld_scan_func_t fh_scan_func;
70 struct fld_cache_entry {
71 struct hlist_node fce_list;
72 struct list_head fce_lru;
79 * Cache guard, protects fci_hash mostly because others immutable after
84 /* Cache shrink threshold */
87 /* Prefered number of cached entries */
90 /* Current number of cached entries. Protected by @fci_lock */
93 /* Hash table size (number of collision lists) */
99 /* Hash table for all collision lists */
100 struct hlist_head *fci_hash_table;
103 struct list_head fci_lru;
105 /* Cache name used for debug and messages. */
109 struct lu_server_fld {
110 /* Fld dir proc entry. */
111 cfs_proc_dir_entry_t *lsf_proc_dir;
113 /* /fld file object device */
114 struct dt_object *lsf_obj;
116 /* Client FLD cache. */
117 struct fld_cache *lsf_cache;
119 /* Protect index modifications */
120 struct semaphore lsf_sem;
122 /* Server cache statistics. */
123 struct fld_stats lsf_stat;
125 /* Fld service name in form "fld-srv-lustre-MDTXXX" */
129 struct lu_client_fld {
130 /* Client side proc entry. */
131 cfs_proc_dir_entry_t *lcf_proc_dir;
133 /* List of exports client FLD knows about. */
134 struct list_head lcf_targets;
136 /* Current hash to be used to chose an export. */
137 struct lu_fld_hash *lcf_hash;
142 /* Lock protecting exports list and fld_hash. */
145 /* Client cache statistics. */
146 struct fld_stats lcf_stat;
148 /* Protect fld req + cache modification. */
149 struct semaphore lcf_sem;
151 /* Client FLD cache. */
152 struct fld_cache *lcf_cache;
154 /* Client fld proc entry name. */
157 const struct lu_context *lcf_ctx;
160 int fld_query(struct com_thread_info *info);
163 int fld_server_init(struct lu_server_fld *fld,
164 struct dt_device *dt,
166 const struct lu_env *env);
168 void fld_server_fini(struct lu_server_fld *fld,
169 const struct lu_env *env);
171 int fld_server_create(struct lu_server_fld *fld,
172 const struct lu_env *env,
173 seqno_t seq, mdsno_t mds);
175 int fld_server_delete(struct lu_server_fld *fld,
176 const struct lu_env *env,
179 int fld_server_lookup(struct lu_server_fld *fld,
180 const struct lu_env *env,
181 seqno_t seq, mdsno_t *mds);
184 int fld_client_init(struct lu_client_fld *fld,
185 const char *prefix, int hash);
187 void fld_client_fini(struct lu_client_fld *fld);
189 int fld_client_lookup(struct lu_client_fld *fld,
190 seqno_t seq, mdsno_t *mds,
191 const struct lu_env *env);
193 int fld_client_create(struct lu_client_fld *fld,
194 seqno_t seq, mdsno_t mds,
195 const struct lu_env *env);
197 int fld_client_delete(struct lu_client_fld *fld,
199 const struct lu_env *env);
201 int fld_client_add_target(struct lu_client_fld *fld,
202 struct lu_fld_target *tar);
204 int fld_client_del_target(struct lu_client_fld *fld,
208 struct fld_cache *fld_cache_init(const char *name,
211 int cache_threshold);
213 void fld_cache_fini(struct fld_cache *cache);
215 void fld_cache_flush(struct fld_cache *cache);
217 int fld_cache_insert(struct fld_cache *cache,
218 seqno_t seq, mdsno_t mds);
220 void fld_cache_delete(struct fld_cache *cache,
224 fld_cache_lookup(struct fld_cache *cache,
225 seqno_t seq, mdsno_t *mds);