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.
32 * Copyright (c) 2011, 2012, Whamcloud, Inc.
35 * This file is part of Lustre, http://www.lustre.org/
36 * Lustre is a trademark of Sun Microsystems, Inc.
38 * lustre/fid/fid_store.c
40 * Lustre Sequence Manager
42 * Author: Yury Umanets <umka@clusterfs.com>
46 # define EXPORT_SYMTAB
48 #define DEBUG_SUBSYSTEM S_FID
51 # include <libcfs/libcfs.h>
52 # include <linux/module.h>
53 #else /* __KERNEL__ */
54 # include <liblustre.h>
58 #include <obd_class.h>
59 #include <dt_object.h>
60 #include <md_object.h>
61 #include <obd_support.h>
62 #include <lustre_req_layout.h>
63 #include <lustre_fid.h>
64 #include "fid_internal.h"
68 static struct lu_buf *seq_store_buf(struct seq_thread_info *info)
73 buf->lb_buf = &info->sti_space;
74 buf->lb_len = sizeof(info->sti_space);
78 struct seq_update_callback {
79 struct dt_txn_commit_cb suc_cb;
80 struct lu_server_seq *suc_seq;
83 void seq_update_cb(struct lu_env *env, struct thandle *th,
84 struct dt_txn_commit_cb *cb, int err)
86 struct seq_update_callback *ccb;
87 ccb = container_of0(cb, struct seq_update_callback, suc_cb);
88 ccb->suc_seq->lss_need_sync = 0;
89 cfs_list_del(&ccb->suc_cb.dcb_linkage);
93 struct thandle *seq_store_trans_create(struct lu_server_seq *seq,
94 const struct lu_env *env)
96 struct dt_device *dt_dev;
98 dt_dev = lu2dt_dev(seq->lss_obj->do_lu.lo_dev);
99 return dt_trans_create(env, dt_dev);
102 int seq_store_trans_start(struct lu_server_seq *seq, const struct lu_env *env,
105 struct dt_device *dt_dev;
108 dt_dev = lu2dt_dev(seq->lss_obj->do_lu.lo_dev);
110 return dt_trans_start(env, dt_dev, th);
113 int seq_update_cb_add(struct thandle *th, struct lu_server_seq *seq)
115 struct seq_update_callback *ccb;
121 ccb->suc_cb.dcb_func = seq_update_cb;
122 CFS_INIT_LIST_HEAD(&ccb->suc_cb.dcb_linkage);
124 seq->lss_need_sync = 1;
125 rc = dt_trans_cb_add(th, &ccb->suc_cb);
131 int seq_declare_store_write(struct lu_server_seq *seq,
132 const struct lu_env *env,
135 struct dt_object *dt_obj = seq->lss_obj;
139 rc = dt_obj->do_body_ops->dbo_declare_write(env, dt_obj,
140 sizeof(struct lu_seq_range),
145 /* This function implies that caller takes care about locking. */
146 int seq_store_write(struct lu_server_seq *seq,
147 const struct lu_env *env,
150 struct dt_object *dt_obj = seq->lss_obj;
151 struct seq_thread_info *info;
156 info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
157 LASSERT(info != NULL);
159 /* Store ranges in le format. */
160 range_cpu_to_le(&info->sti_space, &seq->lss_space);
162 rc = dt_obj->do_body_ops->dbo_write(env, dt_obj,
164 &pos, th, BYPASS_CAPA, 1);
165 if (rc == sizeof(info->sti_space)) {
166 CDEBUG(D_INFO, "%s: Space - "DRANGE"\n",
167 seq->lss_name, PRANGE(&seq->lss_space));
169 } else if (rc >= 0) {
177 int seq_store_update(const struct lu_env *env, struct lu_server_seq *seq,
178 struct lu_seq_range *out, int sync)
180 struct dt_device *dt_dev;
185 dt_dev = lu2dt_dev(seq->lss_obj->do_lu.lo_dev);
187 th = seq_store_trans_create(seq, env);
191 rc = seq_declare_store_write(seq, env, th);
196 rc = fld_declare_server_create(seq->lss_site->ms_server_fld,
202 rc = seq_store_trans_start(seq, env, th);
206 rc = seq_store_write(seq, env, th);
208 CERROR("%s: Can't write space data, rc %d\n",
211 } else if (out != NULL) {
212 rc = fld_server_create(seq->lss_site->ms_server_fld,
215 CERROR("%s: Can't Update fld database, rc %d\n",
221 /* next sequence update will need sync until this update is committed
222 * in case of sync operation this is not needed obviously */
224 /* if callback can't be added then sync always */
225 sync = !!seq_update_cb_add(th, seq);
229 dt_trans_stop(env, dt_dev, th);
234 * This function implies that caller takes care about locking or locking is not
235 * needed (init time).
237 int seq_store_read(struct lu_server_seq *seq,
238 const struct lu_env *env)
240 struct dt_object *dt_obj = seq->lss_obj;
241 struct seq_thread_info *info;
246 info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
247 LASSERT(info != NULL);
249 rc = dt_obj->do_body_ops->dbo_read(env, dt_obj, seq_store_buf(info),
252 if (rc == sizeof(info->sti_space)) {
253 range_le_to_cpu(&seq->lss_space, &info->sti_space);
254 CDEBUG(D_INFO, "%s: Space - "DRANGE"\n",
255 seq->lss_name, PRANGE(&seq->lss_space));
257 } else if (rc == 0) {
259 } else if (rc >= 0) {
260 CERROR("%s: Read only %d bytes of %d\n", seq->lss_name,
261 rc, (int)sizeof(info->sti_space));
268 int seq_store_init(struct lu_server_seq *seq,
269 const struct lu_env *env,
270 struct dt_device *dt)
272 struct dt_object *dt_obj;
278 name = seq->lss_type == LUSTRE_SEQ_SERVER ?
279 LUSTRE_SEQ_SRV_NAME : LUSTRE_SEQ_CTL_NAME;
281 dt_obj = dt_store_open(env, dt, "", name, &fid);
282 if (!IS_ERR(dt_obj)) {
283 seq->lss_obj = dt_obj;
286 CERROR("%s: Can't find \"%s\" obj %d\n",
287 seq->lss_name, name, (int)PTR_ERR(dt_obj));
288 rc = PTR_ERR(dt_obj);
294 void seq_store_fini(struct lu_server_seq *seq,
295 const struct lu_env *env)
299 if (seq->lss_obj != NULL) {
300 if (!IS_ERR(seq->lss_obj))
301 lu_object_put(env, &seq->lss_obj->do_lu);