1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * lustre/fid/fid_request.c
5 * Lustre Sequence Manager
7 * Copyright (c) 2006 Cluster File Systems, Inc.
8 * Author: Yury Umanets <umka@clusterfs.com>
10 * This file is part of the Lustre file system, http://www.lustre.org
11 * Lustre is a trademark of Cluster File Systems, Inc.
13 * You may have signed or agreed to another license before downloading
14 * this software. If so, you are bound by the terms and conditions
15 * of that agreement, and the following does not apply to you. See the
16 * LICENSE file included with this distribution for more information.
18 * If you did not agree to a different license, then this copy of Lustre
19 * is open source software; you can redistribute it and/or modify it
20 * under the terms of version 2 of the GNU General Public License as
21 * published by the Free Software Foundation.
23 * In either case, Lustre is distributed in the hope that it will be
24 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
25 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * license text for more details.
30 # define EXPORT_SYMTAB
32 #define DEBUG_SUBSYSTEM S_FID
35 # include <libcfs/libcfs.h>
36 # include <linux/module.h>
37 #else /* __KERNEL__ */
38 # include <liblustre.h>
42 #include <obd_class.h>
43 #include <dt_object.h>
44 #include <md_object.h>
45 #include <obd_support.h>
46 #include <lustre_req_layout.h>
47 #include <lustre_fid.h>
49 #include <lustre_mdc.h>
50 #include "fid_internal.h"
52 static int seq_client_rpc(struct lu_client_seq *seq, struct lu_range *input,
53 struct lu_range *output, __u32 opc,
56 int rc, size[3] = { sizeof(struct ptlrpc_body),
58 sizeof(struct lu_range) };
59 struct obd_export *exp = seq->lcs_exp;
60 struct ptlrpc_request *req;
61 struct lu_range *out, *in;
62 struct req_capsule pill;
66 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_MDS_VERSION,
67 SEQ_QUERY, 3, size, NULL);
71 req_capsule_init(&pill, req, RCL_CLIENT, NULL);
72 req_capsule_set(&pill, &RQF_SEQ_QUERY);
74 /* Init operation code */
75 op = req_capsule_client_get(&pill, &RMF_SEQ_OPC);
78 /* Zero out input range, this is not recovery yet. */
79 in = req_capsule_client_get(&pill, &RMF_SEQ_RANGE);
85 size[1] = sizeof(struct lu_range);
86 ptlrpc_req_set_repsize(req, 2, size);
88 if (seq->lcs_type == LUSTRE_SEQ_METADATA) {
89 req->rq_request_portal = (opc == SEQ_ALLOC_SUPER) ?
90 SEQ_CONTROLLER_PORTAL : SEQ_METADATA_PORTAL;
92 req->rq_request_portal = (opc == SEQ_ALLOC_SUPER) ?
93 SEQ_CONTROLLER_PORTAL : SEQ_DATA_PORTAL;
96 mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
97 rc = ptlrpc_queue_wait(req);
98 mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
103 out = req_capsule_server_get(&pill, &RMF_SEQ_RANGE);
106 if (!range_is_sane(output)) {
107 CERROR("%s: Invalid range received from server: "
108 DRANGE"\n", seq->lcs_name, PRANGE(output));
109 GOTO(out_req, rc = -EINVAL);
112 if (range_is_exhausted(output)) {
113 CERROR("%s: Range received from server is exhausted: "
114 DRANGE"]\n", seq->lcs_name, PRANGE(output));
115 GOTO(out_req, rc = -EINVAL);
119 CDEBUG(D_INFO, "%s: Allocated %s-sequence "DRANGE"]\n",
120 seq->lcs_name, opcname, PRANGE(output));
124 req_capsule_fini(&pill);
125 ptlrpc_req_finished(req);
129 /* Request sequence-controller node to allocate new super-sequence. */
130 int seq_client_replay_super(struct lu_client_seq *seq,
131 struct lu_range *range,
132 const struct lu_env *env)
141 LASSERT(env != NULL);
142 rc = seq_server_alloc_super(seq->lcs_srv, range,
143 &seq->lcs_space, env);
146 rc = seq_client_rpc(seq, range, &seq->lcs_space,
147 SEQ_ALLOC_SUPER, "super");
155 /* Request sequence-controller node to allocate new super-sequence. */
156 int seq_client_alloc_super(struct lu_client_seq *seq,
157 const struct lu_env *env)
160 RETURN(seq_client_replay_super(seq, NULL, env));
163 /* Request sequence-controller node to allocate new meta-sequence. */
164 static int seq_client_alloc_meta(struct lu_client_seq *seq,
165 const struct lu_env *env)
172 LASSERT(env != NULL);
173 rc = seq_server_alloc_meta(seq->lcs_srv, NULL,
174 &seq->lcs_space, env);
177 rc = seq_client_rpc(seq, NULL, &seq->lcs_space,
178 SEQ_ALLOC_META, "meta");
185 /* Allocate new sequence for client. */
186 static int seq_client_alloc_seq(struct lu_client_seq *seq, seqno_t *seqnr)
191 LASSERT(range_is_sane(&seq->lcs_space));
193 if (range_is_exhausted(&seq->lcs_space)) {
194 rc = seq_client_alloc_meta(seq, NULL);
196 CERROR("%s: Can't allocate new meta-sequence, "
197 "rc %d\n", seq->lcs_name, rc);
200 CDEBUG(D_INFO, "%s: New range - "DRANGE"\n",
201 seq->lcs_name, PRANGE(&seq->lcs_space));
207 LASSERT(!range_is_exhausted(&seq->lcs_space));
208 *seqnr = seq->lcs_space.lr_start;
209 seq->lcs_space.lr_start += 1;
211 CDEBUG(D_INFO, "%s: Allocated sequence ["LPX64"]\n", seq->lcs_name,
217 /* Allocate new fid on passed client @seq and save it to @fid. */
218 int seq_client_alloc_fid(struct lu_client_seq *seq, struct lu_fid *fid)
223 LASSERT(seq != NULL);
224 LASSERT(fid != NULL);
228 if (fid_is_zero(&seq->lcs_fid) ||
229 fid_oid(&seq->lcs_fid) >= seq->lcs_width)
233 rc = seq_client_alloc_seq(seq, &seqnr);
235 CERROR("%s: Can't allocate new sequence, "
236 "rc %d\n", seq->lcs_name, rc);
241 CDEBUG(D_INFO, "%s: Switch to sequence "
242 "[0x%16.16"LPF64"x]\n", seq->lcs_name, seqnr);
244 seq->lcs_fid.f_oid = LUSTRE_FID_INIT_OID;
245 seq->lcs_fid.f_seq = seqnr;
246 seq->lcs_fid.f_ver = 0;
249 * Inform caller that sequence switch is performed to allow it
250 * to setup FLD for it.
254 /* Just bump last allocated fid and return to caller. */
255 seq->lcs_fid.f_oid += 1;
262 CDEBUG(D_INFO, "%s: Allocated FID "DFID"\n", seq->lcs_name, PFID(fid));
265 EXPORT_SYMBOL(seq_client_alloc_fid);
268 * Finish the current sequence due to disconnect.
269 * See mdc_import_event()
271 void seq_client_flush(struct lu_client_seq *seq)
273 LASSERT(seq != NULL);
275 fid_zero(&seq->lcs_fid);
276 range_zero(&seq->lcs_space);
279 EXPORT_SYMBOL(seq_client_flush);
281 static void seq_client_proc_fini(struct lu_client_seq *seq);
284 static int seq_client_proc_init(struct lu_client_seq *seq)
289 seq->lcs_proc_dir = lprocfs_register(seq->lcs_name,
293 if (IS_ERR(seq->lcs_proc_dir)) {
294 CERROR("%s: LProcFS failed in seq-init\n",
296 rc = PTR_ERR(seq->lcs_proc_dir);
300 rc = lprocfs_add_vars(seq->lcs_proc_dir,
301 seq_client_proc_list, seq);
303 CERROR("%s: Can't init sequence manager "
304 "proc, rc %d\n", seq->lcs_name, rc);
305 GOTO(out_cleanup, rc);
311 seq_client_proc_fini(seq);
315 static void seq_client_proc_fini(struct lu_client_seq *seq)
318 if (seq->lcs_proc_dir) {
319 if (!IS_ERR(seq->lcs_proc_dir))
320 lprocfs_remove(&seq->lcs_proc_dir);
321 seq->lcs_proc_dir = NULL;
326 static int seq_client_proc_init(struct lu_client_seq *seq)
331 static void seq_client_proc_fini(struct lu_client_seq *seq)
337 int seq_client_init(struct lu_client_seq *seq,
338 struct obd_export *exp,
339 enum lu_cli_type type,
341 struct lu_server_seq *srv)
346 LASSERT(seq != NULL);
347 LASSERT(prefix != NULL);
351 seq->lcs_type = type;
352 sema_init(&seq->lcs_sem, 1);
353 seq->lcs_width = LUSTRE_SEQ_MAX_WIDTH;
355 /* Make sure that things are clear before work is started. */
356 seq_client_flush(seq);
359 LASSERT(seq->lcs_srv != NULL);
361 LASSERT(seq->lcs_exp != NULL);
362 seq->lcs_exp = class_export_get(seq->lcs_exp);
365 snprintf(seq->lcs_name, sizeof(seq->lcs_name),
368 rc = seq_client_proc_init(seq);
370 seq_client_fini(seq);
373 EXPORT_SYMBOL(seq_client_init);
375 void seq_client_fini(struct lu_client_seq *seq)
379 seq_client_proc_fini(seq);
381 if (seq->lcs_exp != NULL) {
382 class_export_put(seq->lcs_exp);
389 EXPORT_SYMBOL(seq_client_fini);