4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
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).
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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
31 * lustre/fld/fld_internal.h
33 * Subsystem Description:
34 * FLD is FID Location Database, which stores where (IE, on which MDT)
36 * The database is basically a record file, each record consists of a FID
37 * sequence range, MDT/OST index, and flags. The FLD for the whole FS
38 * is only stored on the sequence controller(MDT0) right now, but each target
39 * also has its local FLD, which only stores the local sequence.
41 * The FLD subsystem usually has two tasks:
42 * 1. maintain the database, i.e. when the sequence controller allocates
43 * new sequence ranges to some nodes, it will call the FLD API to insert the
44 * location information <sequence_range, node_index> in FLDB.
46 * 2. Handle requests from other nodes, i.e. if client needs to know where
47 * the FID is located, if it can not find the information in the local cache,
48 * it will send a FLD lookup RPC to the FLD service, and the FLD service will
49 * look up the FLDB entry and return the location information to client.
51 * Author: Yury Umanets <umka@clusterfs.com>
52 * Author: Tom WangDi <wangdi@clusterfs.com>
54 #ifndef __FLD_INTERNAL_H
55 #define __FLD_INTERNAL_H
58 #include <libcfs/libcfs.h>
59 #include <lustre_fld.h>
68 int (*fh_hash_func)(struct lu_client_fld *fld,
70 struct lu_fld_target * (*fh_scan_func)(struct lu_client_fld *fld,
74 struct fld_cache_entry {
75 struct list_head fce_lru;
76 struct list_head fce_list;
78 * fld cache entries are sorted on range->lsr_start field. */
79 struct lu_seq_range fce_range;
84 * Cache guard, protects fci_hash mostly because others immutable after
90 * Cache shrink threshold */
94 * Prefered number of cached entries */
98 * Current number of cached entries. Protected by \a fci_lock */
102 * LRU list fld entries. */
103 struct list_head fci_lru;
106 * sorted fld entries. */
107 struct list_head fci_entries_head;
112 struct fld_stats fci_stat;
115 * Cache name used for debug and messages.
117 char fci_name[LUSTRE_MDT_MAXNAMELEN];
121 /* 4M of FLD cache will not hurt client a lot. */
122 FLD_SERVER_CACHE_SIZE = (4 * 0x100000),
124 /* 1M of FLD cache will not hurt client a lot. */
125 FLD_CLIENT_CACHE_SIZE = (1 * 0x100000)
129 /* Cache threshold is 10 percent of size. */
130 FLD_SERVER_CACHE_THRESHOLD = 10,
132 /* Cache threshold is 10 percent of size. */
133 FLD_CLIENT_CACHE_THRESHOLD = 10
136 extern struct lu_fld_hash fld_hash[];
138 # ifdef HAVE_SERVER_SUPPORT
139 struct fld_thread_info {
140 struct lu_seq_range fti_rec;
141 struct lu_seq_range fti_lrange;
142 struct lu_seq_range fti_irange;
145 extern struct lu_context_key fld_thread_key;
148 int fld_index_init(const struct lu_env *env, struct lu_server_fld *fld,
149 struct dt_device *dt, int type);
151 void fld_index_fini(const struct lu_env *env, struct lu_server_fld *fld);
153 int fld_declare_index_create(const struct lu_env *env,
154 struct lu_server_fld *fld,
155 const struct lu_seq_range *new_range,
158 int fld_index_create(const struct lu_env *env, struct lu_server_fld *fld,
159 const struct lu_seq_range *new_range, struct thandle *th);
161 int fld_index_lookup(const struct lu_env *env, struct lu_server_fld *fld,
162 u64 seq, struct lu_seq_range *range);
164 int fld_name_to_index(const char *name, __u32 *index);
166 int fld_server_mod_init(void);
167 void fld_server_mod_exit(void);
169 int fld_server_read(const struct lu_env *env, struct lu_server_fld *fld,
170 struct lu_seq_range *range, void *data, int data_len);
172 extern const struct file_operations fld_debugfs_seq_fops;
173 extern struct dentry *fld_debugfs_dir;
175 # endif /* HAVE_SERVER_SUPPORT */
177 int fld_client_rpc(struct obd_export *exp,
178 struct lu_seq_range *range, __u32 fld_op,
179 struct ptlrpc_request **reqp);
181 extern struct ldebugfs_vars fld_client_debugfs_list[];
183 struct fld_cache *fld_cache_init(const char *name,
184 int cache_size, int cache_threshold);
186 void fld_cache_fini(struct fld_cache *cache);
188 void fld_cache_flush(struct fld_cache *cache);
190 int fld_cache_insert(struct fld_cache *cache,
191 const struct lu_seq_range *range);
193 struct fld_cache_entry
194 *fld_cache_entry_create(const struct lu_seq_range *range);
196 int fld_cache_insert_nolock(struct fld_cache *cache,
197 struct fld_cache_entry *f_new);
198 void fld_cache_delete_nolock(struct fld_cache *cache,
199 const struct lu_seq_range *range);
200 int fld_cache_lookup(struct fld_cache *cache,
201 const u64 seq, struct lu_seq_range *range);
203 static inline const char *
204 fld_target_name(const struct lu_fld_target *tar)
206 #ifdef HAVE_SERVER_SUPPORT
207 if (tar->ft_srv != NULL)
208 return tar->ft_srv->lsf_name;
211 return tar->ft_exp->exp_obd->obd_name;
214 #endif /* __FLD_INTERNAL_H */