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11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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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.
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30 * Copyright (c) 2011, 2014, 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 <obd_support.h>
48 #include <lustre_fid.h>
49 #include <lustre_fld.h>
50 #include "fid_internal.h"
52 static struct lu_buf *seq_store_buf(struct seq_thread_info *info)
57 buf->lb_buf = &info->sti_space;
58 buf->lb_len = sizeof(info->sti_space);
62 struct seq_update_callback {
63 struct dt_txn_commit_cb suc_cb;
64 struct lu_server_seq *suc_seq;
67 void seq_update_cb(struct lu_env *env, struct thandle *th,
68 struct dt_txn_commit_cb *cb, int err)
70 struct seq_update_callback *ccb;
72 ccb = container_of0(cb, struct seq_update_callback, suc_cb);
74 LASSERT(ccb->suc_seq != NULL);
76 ccb->suc_seq->lss_need_sync = 0;
80 int seq_update_cb_add(struct thandle *th, struct lu_server_seq *seq)
82 struct seq_update_callback *ccb;
83 struct dt_txn_commit_cb *dcb;
91 seq->lss_need_sync = 1;
94 dcb->dcb_func = seq_update_cb;
95 INIT_LIST_HEAD(&dcb->dcb_linkage);
96 strlcpy(dcb->dcb_name, "seq_update_cb", sizeof(dcb->dcb_name));
98 rc = dt_trans_cb_add(th, dcb);
104 /* This function implies that caller takes care about locking. */
105 int seq_store_update(const struct lu_env *env, struct lu_server_seq *seq,
106 struct lu_seq_range *out, int sync)
108 struct dt_device *dt_dev = lu2dt_dev(seq->lss_obj->do_lu.lo_dev);
109 struct seq_thread_info *info;
114 info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
115 LASSERT(info != NULL);
117 th = dt_trans_create(env, dt_dev);
121 /* Store ranges in le format. */
122 range_cpu_to_le(&info->sti_space, &seq->lss_space);
124 rc = dt_declare_record_write(env, seq->lss_obj,
125 seq_store_buf(info), 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 rc = dt_record_write(env, seq->lss_obj, seq_store_buf(info), &pos, th);
143 CERROR("%s: Can't write space data, rc %d\n",
146 } else if (out != NULL) {
147 rc = fld_server_create(env, seq->lss_site->ss_server_fld, out,
150 CERROR("%s: Can't Update fld database, rc %d\n",
155 /* next sequence update will need sync until this update is committed
156 * in case of sync operation this is not needed obviously */
158 /* if callback can't be added then sync always */
159 sync = !!seq_update_cb_add(th, seq);
163 dt_trans_stop(env, dt_dev, th);
168 * This function implies that caller takes care about locking or locking is not
169 * needed (init time).
171 int seq_store_read(struct lu_server_seq *seq,
172 const struct lu_env *env)
174 struct seq_thread_info *info;
179 info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
180 LASSERT(info != NULL);
182 rc = dt_read(env, seq->lss_obj, seq_store_buf(info), &pos);
184 if (rc == sizeof(info->sti_space)) {
185 range_le_to_cpu(&seq->lss_space, &info->sti_space);
186 CDEBUG(D_INFO, "%s: Space - "DRANGE"\n",
187 seq->lss_name, PRANGE(&seq->lss_space));
189 } else if (rc == 0) {
192 CERROR("%s: Read only %d bytes of %d\n", seq->lss_name,
193 rc, (int)sizeof(info->sti_space));
200 int seq_store_init(struct lu_server_seq *seq,
201 const struct lu_env *env,
202 struct dt_device *dt)
204 struct dt_object *dt_obj;
207 struct dt_object_format dof;
212 name = seq->lss_type == LUSTRE_SEQ_SERVER ?
213 LUSTRE_SEQ_SRV_NAME : LUSTRE_SEQ_CTL_NAME;
215 if (seq->lss_type == LUSTRE_SEQ_SERVER)
216 lu_local_obj_fid(&fid, FID_SEQ_SRV_OID);
218 lu_local_obj_fid(&fid, FID_SEQ_CTL_OID);
220 memset(&attr, 0, sizeof(attr));
221 attr.la_valid = LA_MODE;
222 attr.la_mode = S_IFREG | 0666;
223 dof.dof_type = DFT_REGULAR;
225 dt_obj = dt_find_or_create(env, dt, &fid, &dof, &attr);
226 if (!IS_ERR(dt_obj)) {
227 seq->lss_obj = dt_obj;
230 CERROR("%s: Can't find \"%s\" obj %d\n",
231 seq->lss_name, name, (int)PTR_ERR(dt_obj));
232 rc = PTR_ERR(dt_obj);
238 void seq_store_fini(struct lu_server_seq *seq,
239 const struct lu_env *env)
243 if (seq->lss_obj != NULL) {
244 if (!IS_ERR(seq->lss_obj))
245 lu_object_put(env, &seq->lss_obj->do_lu);