4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
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) 2011, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
40 #include <uapi/linux/lustre/lustre_idl.h>
41 #include <libcfs/libcfs.h>
42 #include <seq_range.h>
43 #include <lustre_fid.h>
54 /* FLD (Fid Location Database) interface. */
56 LUSTRE_CLI_FLD_HASH_DHT = 0,
57 LUSTRE_CLI_FLD_HASH_RRB
60 struct lu_fld_target {
61 struct list_head ft_chain;
62 struct obd_export *ft_exp;
63 struct lu_server_fld *ft_srv;
67 struct lu_server_fld {
68 /* Fld dir debugfs entry. */
69 struct dentry *lsf_debugfs_entry;
71 /* /fld file object device */
72 struct dt_object *lsf_obj;
74 /* super seq controller export, needed for forward fld lookup */
75 struct obd_export *lsf_control_exp;
77 /* Client FLD cache. */
78 struct fld_cache *lsf_cache;
80 /* Protect index modifications */
81 struct mutex lsf_lock;
83 /* Fld service name in form "fld-srv-lustre-MDTXXX" */
84 char lsf_name[LUSTRE_MDT_MAXNAMELEN];
86 int (*lsf_seq_lookup)(const struct lu_env *env,
87 struct lu_server_fld *fld, u64 seq,
88 struct lu_seq_range *range);
91 * Just reformatted or upgraded, and this flag is being
92 * used to check whether the local FLDB is needs to be
93 * synced with global FLDB(in MDT0), and it is only needed
94 * if the MDT is upgraded from < 2.6 to 2.6, i.e. when the
95 * local FLDB is being invited
97 unsigned int lsf_new:1;
101 struct lu_client_fld {
102 /* Client side debugfs entry. */
103 struct dentry *lcf_debugfs_entry;
105 /* List of exports client FLD knows about. */
106 struct list_head lcf_targets;
108 /* Current hash to be used to chose an export. */
109 struct lu_fld_hash *lcf_hash;
114 /* Lock protecting exports list and fld_hash. */
117 /* Client FLD cache. */
118 struct fld_cache *lcf_cache;
120 /* Client fld debugfs entry name. */
121 char lcf_name[LUSTRE_MDT_MAXNAMELEN];
125 int fld_server_init(const struct lu_env *env, struct lu_server_fld *fld,
126 struct dt_device *dt, const char *prefix, int type);
128 void fld_server_fini(const struct lu_env *env, struct lu_server_fld *fld);
130 int fld_declare_server_create(const struct lu_env *env,
131 struct lu_server_fld *fld,
132 const struct lu_seq_range *range,
135 int fld_server_create(const struct lu_env *env,
136 struct lu_server_fld *fld,
137 const struct lu_seq_range *add_range,
140 int fld_insert_entry(const struct lu_env *env,
141 struct lu_server_fld *fld,
142 const struct lu_seq_range *range);
144 int fld_server_lookup(const struct lu_env *env, struct lu_server_fld *fld,
145 u64 seq, struct lu_seq_range *range);
147 int fld_local_lookup(const struct lu_env *env, struct lu_server_fld *fld,
148 u64 seq, struct lu_seq_range *range);
150 int fld_update_from_controller(const struct lu_env *env,
151 struct lu_server_fld *fld);
154 int fld_client_init(struct lu_client_fld *fld, const char *prefix,
157 void fld_client_fini(struct lu_client_fld *fld);
159 void fld_client_flush(struct lu_client_fld *fld);
161 int fld_client_lookup(struct lu_client_fld *fld, u64 seq, u32 *mds,
162 __u32 flags, const struct lu_env *env);
164 int fld_client_create(struct lu_client_fld *fld, struct lu_seq_range *range,
165 const struct lu_env *env);
167 int fld_client_delete(struct lu_client_fld *fld, u64 seq,
168 const struct lu_env *env);
170 int fld_client_add_target(struct lu_client_fld *fld,
171 struct lu_fld_target *tar);
173 int fld_client_del_target(struct lu_client_fld *fld, __u64 idx);
175 void fld_client_debugfs_fini(struct lu_client_fld *fld);