1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2001-2003 Cluster File Systems, Inc.
5 * Author Peter Braam <braam@clusterfs.com>
7 * This file is part of the Lustre file system, http://www.lustre.org
8 * Lustre is a trademark of Cluster File Systems, Inc.
10 * You may have signed or agreed to another license before downloading
11 * this software. If so, you are bound by the terms and conditions
12 * of that agreement, and the following does not apply to you. See the
13 * LICENSE file included with this distribution for more information.
15 * If you did not agree to a different license, then this copy of Lustre
16 * is open source software; you can redistribute it and/or modify it
17 * under the terms of version 2 of the GNU General Public License as
18 * published by the Free Software Foundation.
20 * In either case, Lustre is distributed in the hope that it will be
21 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
22 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * license text for more details.
27 #define DEBUG_SUBSYSTEM S_RPC
30 # include <libcfs/libcfs.h>
31 #else /* __KERNEL__ */
32 # include <liblustre.h>
36 #include <libcfs/kp30.h>
37 #include <lustre_net.h>
38 # include <lustre_lib.h>
40 #include <lustre_ha.h>
41 #include <obd_class.h> /* for obd_zombie */
42 #include <obd_support.h> /* for OBD_FAIL_CHECK */
43 #include <lprocfs_status.h>
47 unsigned long pc_flags;
49 struct completion pc_starting;
50 struct completion pc_finishing;
51 struct ptlrpc_request_set *pc_set;
56 void *pc_wait_callback;
57 void *pc_idle_callback;
61 static struct ptlrpcd_ctl ptlrpcd_pc;
62 static struct ptlrpcd_ctl ptlrpcd_recovery_pc;
64 struct semaphore ptlrpcd_sem;
65 static int ptlrpcd_users = 0;
67 void ptlrpcd_wake(struct ptlrpc_request *req)
69 struct ptlrpc_request_set *rq_set = req->rq_set;
71 LASSERT(rq_set != NULL);
73 cfs_waitq_signal(&rq_set->set_waitq);
76 /* requests that are added to the ptlrpcd queue are sent via
77 * ptlrpcd_check->ptlrpc_check_set() */
78 void ptlrpcd_add_req(struct ptlrpc_request *req)
80 struct ptlrpcd_ctl *pc;
82 if (req->rq_send_state == LUSTRE_IMP_FULL)
85 pc = &ptlrpcd_recovery_pc;
87 ptlrpc_set_add_new_req(pc->pc_set, req);
88 cfs_waitq_signal(&pc->pc_set->set_waitq);
91 static int ptlrpcd_check(struct ptlrpcd_ctl *pc)
93 struct list_head *tmp, *pos;
94 struct ptlrpc_request *req;
98 if (test_bit(LIOD_STOP, &pc->pc_flags))
101 obd_zombie_impexp_cull();
103 spin_lock(&pc->pc_set->set_new_req_lock);
104 list_for_each_safe(pos, tmp, &pc->pc_set->set_new_requests) {
105 req = list_entry(pos, struct ptlrpc_request, rq_set_chain);
106 list_del_init(&req->rq_set_chain);
107 ptlrpc_set_add_req(pc->pc_set, req);
108 rc = 1; /* need to calculate its timeout */
110 spin_unlock(&pc->pc_set->set_new_req_lock);
112 if (pc->pc_set->set_remaining) {
113 rc = rc | ptlrpc_check_set(pc->pc_set);
115 /* XXX our set never completes, so we prune the completed
116 * reqs after each iteration. boy could this be smarter. */
117 list_for_each_safe(pos, tmp, &pc->pc_set->set_requests) {
118 req = list_entry(pos, struct ptlrpc_request,
120 if (req->rq_phase != RQ_PHASE_COMPLETE)
123 list_del_init(&req->rq_set_chain);
125 ptlrpc_req_finished (req);
130 /* If new requests have been added, make sure to wake up */
131 spin_lock(&pc->pc_set->set_new_req_lock);
132 rc = !list_empty(&pc->pc_set->set_new_requests);
133 spin_unlock(&pc->pc_set->set_new_req_lock);
140 /* ptlrpc's code paths like to execute in process context, so we have this
141 * thread which spins on a set which contains the io rpcs. llite specifies
142 * ptlrpcd's set when it pushes pages down into the oscs */
143 static int ptlrpcd(void *arg)
145 struct ptlrpcd_ctl *pc = arg;
149 if ((rc = cfs_daemonize_ctxt(pc->pc_name))) {
150 complete(&pc->pc_starting);
154 complete(&pc->pc_starting);
156 /* this mainloop strongly resembles ptlrpc_set_wait except
157 * that our set never completes. ptlrpcd_check calls ptlrpc_check_set
158 * when there are requests in the set. new requests come in
159 * on the set's new_req_list and ptlrpcd_check moves them into
162 struct l_wait_info lwi;
163 cfs_duration_t timeout;
165 timeout = cfs_time_seconds(ptlrpc_set_next_timeout(pc->pc_set));
166 lwi = LWI_TIMEOUT(timeout, ptlrpc_expired_set, pc->pc_set);
168 l_wait_event(pc->pc_set->set_waitq, ptlrpcd_check(pc), &lwi);
170 if (test_bit(LIOD_STOP, &pc->pc_flags))
173 /* wait for inflight requests to drain */
174 if (!list_empty(&pc->pc_set->set_requests))
175 ptlrpc_set_wait(pc->pc_set);
176 complete(&pc->pc_finishing);
180 static void ptlrpcd_zombie_impexp_notify(void)
182 LASSERT(ptlrpcd_pc.pc_set != NULL); // call before ptlrpcd inited ?
184 cfs_waitq_signal(&ptlrpcd_pc.pc_set->set_waitq);
189 int ptlrpcd_check_async_rpcs(void *arg)
191 struct ptlrpcd_ctl *pc = arg;
194 /* single threaded!! */
197 if (pc->pc_recurred == 1) {
198 rc = ptlrpcd_check(pc);
200 ptlrpc_expired_set(pc->pc_set);
201 /*XXX send replay requests */
202 if (pc == &ptlrpcd_recovery_pc)
203 rc = ptlrpcd_check(pc);
210 int ptlrpcd_idle(void *arg)
212 struct ptlrpcd_ctl *pc = arg;
214 return (list_empty(&pc->pc_set->set_new_requests) &&
215 pc->pc_set->set_remaining == 0);
220 static int ptlrpcd_start(char *name, struct ptlrpcd_ctl *pc)
225 memset(pc, 0, sizeof(*pc));
226 init_completion(&pc->pc_starting);
227 init_completion(&pc->pc_finishing);
229 spin_lock_init(&pc->pc_lock);
230 snprintf (pc->pc_name, sizeof (pc->pc_name), name);
232 pc->pc_set = ptlrpc_prep_set();
233 if (pc->pc_set == NULL)
237 /* wake ptlrpcd when zombie imports or exports exist */
238 obd_zombie_impexp_notify = ptlrpcd_zombie_impexp_notify;
240 rc = cfs_kernel_thread(ptlrpcd, pc, 0);
242 ptlrpc_set_destroy(pc->pc_set);
246 wait_for_completion(&pc->pc_starting);
248 pc->pc_wait_callback =
249 liblustre_register_wait_callback("ptlrpcd_check_async_rpcs",
250 &ptlrpcd_check_async_rpcs, pc);
251 pc->pc_idle_callback =
252 liblustre_register_idle_callback("ptlrpcd_check_idle_rpcs",
259 static void ptlrpcd_stop(struct ptlrpcd_ctl *pc)
261 set_bit(LIOD_STOP, &pc->pc_flags);
262 cfs_waitq_signal(&pc->pc_set->set_waitq);
264 obd_zombie_impexp_notify = NULL;
265 wait_for_completion(&pc->pc_finishing);
267 liblustre_deregister_wait_callback(pc->pc_wait_callback);
268 liblustre_deregister_idle_callback(pc->pc_idle_callback);
270 ptlrpc_set_destroy(pc->pc_set);
273 int ptlrpcd_addref(void)
278 mutex_down(&ptlrpcd_sem);
279 if (++ptlrpcd_users != 1)
282 rc = ptlrpcd_start("ptlrpcd", &ptlrpcd_pc);
288 rc = ptlrpcd_start("ptlrpcd-recov", &ptlrpcd_recovery_pc);
290 ptlrpcd_stop(&ptlrpcd_pc);
295 mutex_up(&ptlrpcd_sem);
299 void ptlrpcd_decref(void)
301 mutex_down(&ptlrpcd_sem);
302 if (--ptlrpcd_users == 0) {
303 ptlrpcd_stop(&ptlrpcd_pc);
304 ptlrpcd_stop(&ptlrpcd_recovery_pc);
306 mutex_up(&ptlrpcd_sem);