1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
31 * Copyright (c) 2011 Whamcloud, Inc.
34 * This file is part of Lustre, http://www.lustre.org/
35 * Lustre is a trademark of Sun Microsystems, Inc.
37 * lustre/fid/fid_store.c
39 * Lustre Sequence Manager
41 * Author: Yury Umanets <umka@clusterfs.com>
45 # define EXPORT_SYMTAB
47 #define DEBUG_SUBSYSTEM S_FID
50 # include <libcfs/libcfs.h>
51 # include <linux/module.h>
52 #else /* __KERNEL__ */
53 # include <liblustre.h>
57 #include <obd_class.h>
58 #include <dt_object.h>
59 #include <md_object.h>
60 #include <obd_support.h>
61 #include <lustre_req_layout.h>
62 #include <lustre_fid.h>
63 #include "fid_internal.h"
67 static struct lu_buf *seq_store_buf(struct seq_thread_info *info)
72 buf->lb_buf = &info->sti_space;
73 buf->lb_len = sizeof(info->sti_space);
77 struct seq_update_callback {
78 struct dt_txn_commit_cb suc_cb;
79 struct lu_server_seq *suc_seq;
82 void seq_update_cb(struct lu_env *env, struct thandle *th,
83 struct dt_txn_commit_cb *cb, int err)
85 struct seq_update_callback *ccb;
86 ccb = container_of0(cb, struct seq_update_callback, suc_cb);
87 ccb->suc_seq->lss_need_sync = 0;
88 cfs_list_del(&ccb->suc_cb.dcb_linkage);
92 struct thandle *seq_store_trans_create(struct lu_server_seq *seq,
93 const struct lu_env *env)
95 struct dt_device *dt_dev;
97 dt_dev = lu2dt_dev(seq->lss_obj->do_lu.lo_dev);
98 return dt_trans_create(env, dt_dev);
101 int seq_store_trans_start(struct lu_server_seq *seq, const struct lu_env *env,
104 struct dt_device *dt_dev;
107 dt_dev = lu2dt_dev(seq->lss_obj->do_lu.lo_dev);
109 return dt_trans_start(env, dt_dev, th);
112 int seq_update_cb_add(struct thandle *th, struct lu_server_seq *seq)
114 struct seq_update_callback *ccb;
120 ccb->suc_cb.dcb_func = seq_update_cb;
121 CFS_INIT_LIST_HEAD(&ccb->suc_cb.dcb_linkage);
123 seq->lss_need_sync = 1;
124 rc = dt_trans_cb_add(th, &ccb->suc_cb);
130 int seq_declare_store_write(struct lu_server_seq *seq,
131 const struct lu_env *env,
134 struct dt_object *dt_obj = seq->lss_obj;
138 rc = dt_obj->do_body_ops->dbo_declare_write(env, dt_obj,
139 sizeof(struct lu_seq_range),
144 /* This function implies that caller takes care about locking. */
145 int seq_store_write(struct lu_server_seq *seq,
146 const struct lu_env *env,
149 struct dt_object *dt_obj = seq->lss_obj;
150 struct seq_thread_info *info;
155 info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
156 LASSERT(info != NULL);
158 /* Store ranges in le format. */
159 range_cpu_to_le(&info->sti_space, &seq->lss_space);
161 rc = dt_obj->do_body_ops->dbo_write(env, dt_obj,
163 &pos, th, BYPASS_CAPA, 1);
164 if (rc == sizeof(info->sti_space)) {
165 CDEBUG(D_INFO, "%s: Space - "DRANGE"\n",
166 seq->lss_name, PRANGE(&seq->lss_space));
168 } else if (rc >= 0) {
176 int seq_store_update(const struct lu_env *env, struct lu_server_seq *seq,
177 struct lu_seq_range *out, int sync)
179 struct dt_device *dt_dev;
184 dt_dev = lu2dt_dev(seq->lss_obj->do_lu.lo_dev);
186 th = seq_store_trans_create(seq, env);
190 rc = seq_declare_store_write(seq, env, th);
195 rc = fld_declare_server_create(seq->lss_site->ms_server_fld,
201 rc = seq_store_trans_start(seq, env, th);
205 rc = seq_store_write(seq, env, th);
207 CERROR("%s: Can't write space data, rc %d\n",
210 } else if (out != NULL) {
211 rc = fld_server_create(seq->lss_site->ms_server_fld,
214 CERROR("%s: Can't Update fld database, rc %d\n",
220 /* next sequence update will need sync until this update is committed
221 * in case of sync operation this is not needed obviously */
223 /* if callback can't be added then sync always */
224 sync = !!seq_update_cb_add(th, seq);
228 dt_trans_stop(env, dt_dev, th);
233 * This function implies that caller takes care about locking or locking is not
234 * needed (init time).
236 int seq_store_read(struct lu_server_seq *seq,
237 const struct lu_env *env)
239 struct dt_object *dt_obj = seq->lss_obj;
240 struct seq_thread_info *info;
245 info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
246 LASSERT(info != NULL);
248 rc = dt_obj->do_body_ops->dbo_read(env, dt_obj, seq_store_buf(info),
251 if (rc == sizeof(info->sti_space)) {
252 range_le_to_cpu(&seq->lss_space, &info->sti_space);
253 CDEBUG(D_INFO, "%s: Space - "DRANGE"\n",
254 seq->lss_name, PRANGE(&seq->lss_space));
256 } else if (rc == 0) {
258 } else if (rc >= 0) {
259 CERROR("%s: Read only %d bytes of %d\n", seq->lss_name,
260 rc, (int)sizeof(info->sti_space));
267 int seq_store_init(struct lu_server_seq *seq,
268 const struct lu_env *env,
269 struct dt_device *dt)
271 struct dt_object *dt_obj;
277 name = seq->lss_type == LUSTRE_SEQ_SERVER ?
278 LUSTRE_SEQ_SRV_NAME : LUSTRE_SEQ_CTL_NAME;
280 dt_obj = dt_store_open(env, dt, "", name, &fid);
281 if (!IS_ERR(dt_obj)) {
282 seq->lss_obj = dt_obj;
285 CERROR("%s: Can't find \"%s\" obj %d\n",
286 seq->lss_name, name, (int)PTR_ERR(dt_obj));
287 rc = PTR_ERR(dt_obj);
293 void seq_store_fini(struct lu_server_seq *seq,
294 const struct lu_env *env)
298 if (seq->lss_obj != NULL) {
299 if (!IS_ERR(seq->lss_obj))
300 lu_object_put(env, &seq->lss_obj->do_lu);