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.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/fid/fid_store.c
38 * Lustre Sequence Manager
40 * Author: Yury Umanets <umka@clusterfs.com>
44 # define EXPORT_SYMTAB
46 #define DEBUG_SUBSYSTEM S_FID
49 # include <libcfs/libcfs.h>
50 # include <linux/module.h>
51 #else /* __KERNEL__ */
52 # include <liblustre.h>
56 #include <obd_class.h>
57 #include <dt_object.h>
58 #include <md_object.h>
59 #include <obd_support.h>
60 #include <lustre_req_layout.h>
61 #include <lustre_fid.h>
62 #include "fid_internal.h"
66 static struct lu_buf *seq_store_buf(struct seq_thread_info *info)
71 buf->lb_buf = &info->sti_space;
72 buf->lb_len = sizeof(info->sti_space);
76 struct seq_update_callback {
77 struct dt_txn_commit_cb suc_cb;
78 struct lu_server_seq *suc_seq;
81 void seq_update_cb(struct lu_env *env, struct thandle *th,
82 struct dt_txn_commit_cb *cb, int err)
84 struct seq_update_callback *ccb;
85 ccb = container_of0(cb, struct seq_update_callback, suc_cb);
86 ccb->suc_seq->lss_need_sync = 0;
87 cfs_list_del(&ccb->suc_cb.dcb_linkage);
91 int seq_update_cb_add(struct thandle *th, struct lu_server_seq *seq)
93 struct seq_update_callback *ccb;
99 ccb->suc_cb.dcb_func = seq_update_cb;
100 CFS_INIT_LIST_HEAD(&ccb->suc_cb.dcb_linkage);
102 seq->lss_need_sync = 1;
103 rc = dt_trans_cb_add(th, &ccb->suc_cb);
109 /* This function implies that caller takes care about locking. */
110 int seq_store_write(struct lu_server_seq *seq,
111 const struct lu_env *env,
114 struct dt_object *dt_obj = seq->lss_obj;
115 struct seq_thread_info *info;
120 info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
121 LASSERT(info != NULL);
123 /* Store ranges in le format. */
124 range_cpu_to_le(&info->sti_space, &seq->lss_space);
126 rc = dt_obj->do_body_ops->dbo_write(env, dt_obj,
128 &pos, th, BYPASS_CAPA, 1);
129 if (rc == sizeof(info->sti_space)) {
130 CDEBUG(D_INFO, "%s: Space - "DRANGE"\n",
131 seq->lss_name, PRANGE(&seq->lss_space));
133 } else if (rc >= 0) {
141 int seq_store_update(const struct lu_env *env, struct lu_server_seq *seq,
142 struct lu_seq_range *out, int sync)
144 struct seq_thread_info *info;
145 struct dt_device *dt_dev;
148 int credits = SEQ_TXN_STORE_CREDITS;
151 dt_dev = lu2dt_dev(seq->lss_obj->do_lu.lo_dev);
152 info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
155 credits += FLD_TXN_INDEX_INSERT_CREDITS;
157 txn_param_init(&info->sti_txn, credits);
158 th = dt_trans_start(env, dt_dev, &info->sti_txn);
162 rc = seq_store_write(seq, env, th);
164 CERROR("%s: Can't write space data, rc %d\n",
167 } else if (out != NULL) {
168 rc = fld_server_create(seq->lss_site->ms_server_fld,
171 CERROR("%s: Can't Update fld database, rc %d\n",
177 /* next sequence update will need sync until this update is committed
178 * in case of sync operation this is not needed obviously */
180 /* if callback can't be added then sync always */
181 sync = !!seq_update_cb_add(th, seq);
185 dt_trans_stop(env, dt_dev, th);
190 * This function implies that caller takes care about locking or locking is not
191 * needed (init time).
193 int seq_store_read(struct lu_server_seq *seq,
194 const struct lu_env *env)
196 struct dt_object *dt_obj = seq->lss_obj;
197 struct seq_thread_info *info;
202 info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
203 LASSERT(info != NULL);
205 rc = dt_obj->do_body_ops->dbo_read(env, dt_obj, seq_store_buf(info),
208 if (rc == sizeof(info->sti_space)) {
209 range_le_to_cpu(&seq->lss_space, &info->sti_space);
210 CDEBUG(D_INFO, "%s: Space - "DRANGE"\n",
211 seq->lss_name, PRANGE(&seq->lss_space));
213 } else if (rc == 0) {
215 } else if (rc >= 0) {
216 CERROR("%s: Read only %d bytes of %d\n", seq->lss_name,
217 rc, (int)sizeof(info->sti_space));
224 int seq_store_init(struct lu_server_seq *seq,
225 const struct lu_env *env,
226 struct dt_device *dt)
228 struct dt_object *dt_obj;
234 name = seq->lss_type == LUSTRE_SEQ_SERVER ?
235 LUSTRE_SEQ_SRV_NAME : LUSTRE_SEQ_CTL_NAME;
237 dt_obj = dt_store_open(env, dt, "", name, &fid);
238 if (!IS_ERR(dt_obj)) {
239 seq->lss_obj = dt_obj;
242 CERROR("%s: Can't find \"%s\" obj %d\n",
243 seq->lss_name, name, (int)PTR_ERR(dt_obj));
244 rc = PTR_ERR(dt_obj);
250 void seq_store_fini(struct lu_server_seq *seq,
251 const struct lu_env *env)
255 if (seq->lss_obj != NULL) {
256 if (!IS_ERR(seq->lss_obj))
257 lu_object_put(env, &seq->lss_obj->do_lu);