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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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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.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 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/fid/fid_store.c
38 * Lustre Sequence Manager
40 * Author: Yury Umanets <umka@clusterfs.com>
43 #define DEBUG_SUBSYSTEM S_FID
45 #include <libcfs/libcfs.h>
46 #include <dt_object.h>
47 #include <md_object.h>
48 #include <obd_support.h>
49 #include <lustre_capa.h>
50 #include <lustre_fid.h>
51 #include <lustre_fld.h>
52 #include "fid_internal.h"
54 static struct lu_buf *seq_store_buf(struct seq_thread_info *info)
59 buf->lb_buf = &info->sti_space;
60 buf->lb_len = sizeof(info->sti_space);
64 struct seq_update_callback {
65 struct dt_txn_commit_cb suc_cb;
66 struct lu_server_seq *suc_seq;
69 void seq_update_cb(struct lu_env *env, struct thandle *th,
70 struct dt_txn_commit_cb *cb, int err)
72 struct seq_update_callback *ccb;
74 ccb = container_of0(cb, struct seq_update_callback, suc_cb);
76 LASSERT(ccb->suc_seq != NULL);
78 ccb->suc_seq->lss_need_sync = 0;
82 int seq_update_cb_add(struct thandle *th, struct lu_server_seq *seq)
84 struct seq_update_callback *ccb;
85 struct dt_txn_commit_cb *dcb;
93 seq->lss_need_sync = 1;
96 dcb->dcb_func = seq_update_cb;
97 CFS_INIT_LIST_HEAD(&dcb->dcb_linkage);
98 strncpy(dcb->dcb_name, "seq_update_cb", MAX_COMMIT_CB_STR_LEN);
99 dcb->dcb_name[MAX_COMMIT_CB_STR_LEN - 1] = '\0';
101 rc = dt_trans_cb_add(th, dcb);
107 /* This function implies that caller takes care about locking. */
108 int seq_store_update(const struct lu_env *env, struct lu_server_seq *seq,
109 struct lu_seq_range *out, int sync)
111 struct dt_device *dt_dev = lu2dt_dev(seq->lss_obj->do_lu.lo_dev);
112 struct seq_thread_info *info;
117 info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
118 LASSERT(info != NULL);
120 th = dt_trans_create(env, dt_dev);
124 rc = dt_declare_record_write(env, seq->lss_obj,
125 sizeof(struct lu_seq_range), 0, th);
130 rc = fld_declare_server_create(env,
131 seq->lss_site->ss_server_fld,
137 rc = dt_trans_start_local(env, dt_dev, th);
141 /* Store ranges in le format. */
142 range_cpu_to_le(&info->sti_space, &seq->lss_space);
144 rc = dt_record_write(env, seq->lss_obj, seq_store_buf(info), &pos, th);
146 CERROR("%s: Can't write space data, rc %d\n",
149 } else if (out != NULL) {
150 rc = fld_server_create(env, seq->lss_site->ss_server_fld, out,
153 CERROR("%s: Can't Update fld database, rc %d\n",
158 /* next sequence update will need sync until this update is committed
159 * in case of sync operation this is not needed obviously */
161 /* if callback can't be added then sync always */
162 sync = !!seq_update_cb_add(th, seq);
166 dt_trans_stop(env, dt_dev, th);
171 * This function implies that caller takes care about locking or locking is not
172 * needed (init time).
174 int seq_store_read(struct lu_server_seq *seq,
175 const struct lu_env *env)
177 struct seq_thread_info *info;
182 info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
183 LASSERT(info != NULL);
185 rc = seq->lss_obj->do_body_ops->dbo_read(env, seq->lss_obj,
189 if (rc == sizeof(info->sti_space)) {
190 range_le_to_cpu(&seq->lss_space, &info->sti_space);
191 CDEBUG(D_INFO, "%s: Space - "DRANGE"\n",
192 seq->lss_name, PRANGE(&seq->lss_space));
194 } else if (rc == 0) {
197 CERROR("%s: Read only %d bytes of %d\n", seq->lss_name,
198 rc, (int)sizeof(info->sti_space));
205 int seq_store_init(struct lu_server_seq *seq,
206 const struct lu_env *env,
207 struct dt_device *dt)
209 struct dt_object *dt_obj;
212 struct dt_object_format dof;
217 name = seq->lss_type == LUSTRE_SEQ_SERVER ?
218 LUSTRE_SEQ_SRV_NAME : LUSTRE_SEQ_CTL_NAME;
220 if (seq->lss_type == LUSTRE_SEQ_SERVER)
221 lu_local_obj_fid(&fid, FID_SEQ_SRV_OID);
223 lu_local_obj_fid(&fid, FID_SEQ_CTL_OID);
225 memset(&attr, 0, sizeof(attr));
226 attr.la_valid = LA_MODE;
227 attr.la_mode = S_IFREG | 0666;
228 dof.dof_type = DFT_REGULAR;
230 dt_obj = dt_find_or_create(env, dt, &fid, &dof, &attr);
231 if (!IS_ERR(dt_obj)) {
232 seq->lss_obj = dt_obj;
235 CERROR("%s: Can't find \"%s\" obj %d\n",
236 seq->lss_name, name, (int)PTR_ERR(dt_obj));
237 rc = PTR_ERR(dt_obj);
243 void seq_store_fini(struct lu_server_seq *seq,
244 const struct lu_env *env)
248 if (seq->lss_obj != NULL) {
249 if (!IS_ERR(seq->lss_obj))
250 lu_object_put(env, &seq->lss_obj->do_lu);