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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).
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17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2012, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/fld/fld_internal.h
38 * Author: Yury Umanets <umka@clusterfs.com>
39 * Author: Tom WangDi <wangdi@clusterfs.com>
41 #ifndef __FLD_INTERNAL_H
42 #define __FLD_INTERNAL_H
44 #include "../include/lustre/lustre_idl.h"
46 #include "../../include/linux/libcfs/libcfs.h"
47 #include "../include/lustre_req_layout.h"
48 #include "../include/lustre_fld.h"
51 LUSTRE_FLD_INIT = 1 << 0,
52 LUSTRE_FLD_RUN = 1 << 1
61 typedef int (*fld_hash_func_t) (struct lu_client_fld *, __u64);
63 typedef struct lu_fld_target *
64 (*fld_scan_func_t) (struct lu_client_fld *, __u64);
68 fld_hash_func_t fh_hash_func;
69 fld_scan_func_t fh_scan_func;
72 struct fld_cache_entry {
73 struct list_head fce_lru;
74 struct list_head fce_list;
76 * fld cache entries are sorted on range->lsr_start field. */
77 struct lu_seq_range fce_range;
82 * Cache guard, protects fci_hash mostly because others immutable after
88 * Cache shrink threshold */
92 * Preferred number of cached entries */
96 * Current number of cached entries. Protected by \a fci_lock */
100 * LRU list fld entries. */
101 struct list_head fci_lru;
104 * sorted fld entries. */
105 struct list_head fci_entries_head;
108 * Cache statistics. */
109 struct fld_stats fci_stat;
112 * Cache name used for debug and messages. */
113 char fci_name[LUSTRE_MDT_MAXNAMELEN];
114 unsigned int fci_no_shrink:1;
124 /* 4M of FLD cache will not hurt client a lot. */
125 FLD_SERVER_CACHE_SIZE = (4 * 0x100000),
127 /* 1M of FLD cache will not hurt client a lot. */
128 FLD_CLIENT_CACHE_SIZE = (1 * 0x100000)
132 /* Cache threshold is 10 percent of size. */
133 FLD_SERVER_CACHE_THRESHOLD = 10,
135 /* Cache threshold is 10 percent of size. */
136 FLD_CLIENT_CACHE_THRESHOLD = 10
139 extern struct lu_fld_hash fld_hash[];
141 int fld_client_rpc(struct obd_export *exp,
142 struct lu_seq_range *range, __u32 fld_op);
144 extern struct lprocfs_vars fld_client_debugfs_list[];
146 struct fld_cache *fld_cache_init(const char *name,
147 int cache_size, int cache_threshold);
149 void fld_cache_fini(struct fld_cache *cache);
151 void fld_cache_flush(struct fld_cache *cache);
153 int fld_cache_insert(struct fld_cache *cache,
154 const struct lu_seq_range *range);
156 struct fld_cache_entry
157 *fld_cache_entry_create(const struct lu_seq_range *range);
159 int fld_cache_insert_nolock(struct fld_cache *cache,
160 struct fld_cache_entry *f_new);
161 void fld_cache_delete(struct fld_cache *cache,
162 const struct lu_seq_range *range);
163 void fld_cache_delete_nolock(struct fld_cache *cache,
164 const struct lu_seq_range *range);
165 int fld_cache_lookup(struct fld_cache *cache,
166 const u64 seq, struct lu_seq_range *range);
168 struct fld_cache_entry*
169 fld_cache_entry_lookup(struct fld_cache *cache, struct lu_seq_range *range);
170 void fld_cache_entry_delete(struct fld_cache *cache,
171 struct fld_cache_entry *node);
172 void fld_dump_cache_entries(struct fld_cache *cache);
174 struct fld_cache_entry
175 *fld_cache_entry_lookup_nolock(struct fld_cache *cache,
176 struct lu_seq_range *range);
178 static inline const char *
179 fld_target_name(struct lu_fld_target *tar)
181 if (tar->ft_srv != NULL)
182 return tar->ft_srv->lsf_name;
184 return (const char *)tar->ft_exp->exp_obd->obd_name;
187 #endif /* __FLD_INTERNAL_H */