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 list_head pc_req_list;
53 struct ptlrpc_request_set *pc_set;
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 ptlrpcd_ctl *pc = req->rq_ptlrpcd_data;
73 cfs_waitq_signal(&pc->pc_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 req->rq_ptlrpcd_data = pc;
88 ptlrpc_set_add_new_req(pc->pc_set, req);
89 wake_up(&pc->pc_waitq);
92 static int ptlrpcd_check(struct ptlrpcd_ctl *pc)
94 struct list_head *tmp, *pos;
95 struct ptlrpc_request *req;
99 if (test_bit(LIOD_STOP, &pc->pc_flags))
102 obd_zombie_impexp_cull();
104 spin_lock(&pc->pc_set->set_new_req_lock);
105 list_for_each_safe(pos, tmp, &pc->pc_set->set_new_requests) {
106 req = list_entry(pos, struct ptlrpc_request, rq_set_chain);
107 list_del_init(&req->rq_set_chain);
108 ptlrpc_set_add_req(pc->pc_set, req);
109 rc = 1; /* need to calculate its timeout */
111 spin_unlock(&pc->pc_set->set_new_req_lock);
113 if (pc->pc_set->set_remaining) {
114 rc = rc | ptlrpc_check_set(pc->pc_set);
116 /* XXX our set never completes, so we prune the completed
117 * reqs after each iteration. boy could this be smarter. */
118 list_for_each_safe(pos, tmp, &pc->pc_set->set_requests) {
119 req = list_entry(pos, struct ptlrpc_request,
121 if (req->rq_phase != RQ_PHASE_COMPLETE)
124 list_del_init(&req->rq_set_chain);
126 ptlrpc_req_finished (req);
131 /* If new requests have been added, make sure to wake up */
132 spin_lock(&pc->pc_set->set_new_req_lock);
133 rc = !list_empty(&pc->pc_set->set_new_requests);
134 spin_unlock(&pc->pc_set->set_new_req_lock);
141 /* ptlrpc's code paths like to execute in process context, so we have this
142 * thread which spins on a set which contains the io rpcs. llite specifies
143 * ptlrpcd's set when it pushes pages down into the oscs */
144 static int ptlrpcd(void *arg)
146 struct ptlrpcd_ctl *pc = arg;
150 if ((rc = cfs_daemonize_ctxt(pc->pc_name))) {
151 complete(&pc->pc_starting);
155 complete(&pc->pc_starting);
157 /* this mainloop strongly resembles ptlrpc_set_wait except
158 * that our set never completes. ptlrpcd_check calls ptlrpc_check_set
159 * when there are requests in the set. new requests come in
160 * on the set's new_req_list and ptlrpcd_check moves them into
163 cfs_waitlink_t set_wait;
164 struct l_wait_info lwi;
165 cfs_duration_t timeout;
167 timeout = cfs_time_seconds(ptlrpc_set_next_timeout(pc->pc_set));
168 lwi = LWI_TIMEOUT(timeout, ptlrpc_expired_set, pc->pc_set);
170 /* ala the pinger, wait on pc's waitqueue and the set's */
171 cfs_waitlink_init(&set_wait);
172 cfs_waitq_add(&pc->pc_set->set_waitq, &set_wait);
173 cfs_waitq_forward(&set_wait, &pc->pc_waitq);
174 l_wait_event(pc->pc_waitq, ptlrpcd_check(pc), &lwi);
175 cfs_waitq_del(&pc->pc_set->set_waitq, &set_wait);
177 if (test_bit(LIOD_STOP, &pc->pc_flags))
180 /* wait for inflight requests to drain */
181 if (!list_empty(&pc->pc_set->set_requests))
182 ptlrpc_set_wait(pc->pc_set);
183 complete(&pc->pc_finishing);
187 static void ptlrpcd_zombie_impexp_notify(void)
189 cfs_waitq_signal(&ptlrpcd_pc.pc_waitq);
193 int ptlrpcd_check_async_rpcs(void *arg)
195 struct ptlrpcd_ctl *pc = arg;
198 /* single threaded!! */
201 if (pc->pc_recurred == 1) {
202 rc = ptlrpcd_check(pc);
204 ptlrpc_expired_set(pc->pc_set);
205 /*XXX send replay requests */
206 if (pc == &ptlrpcd_recovery_pc)
207 rc = ptlrpcd_check(pc);
215 static int ptlrpcd_start(char *name, struct ptlrpcd_ctl *pc)
220 memset(pc, 0, sizeof(*pc));
221 init_completion(&pc->pc_starting);
222 init_completion(&pc->pc_finishing);
223 cfs_waitq_init(&pc->pc_waitq);
225 spin_lock_init(&pc->pc_lock);
226 CFS_INIT_LIST_HEAD(&pc->pc_req_list);
227 snprintf (pc->pc_name, sizeof (pc->pc_name), name);
229 pc->pc_set = ptlrpc_prep_set();
230 if (pc->pc_set == NULL)
234 /* wake ptlrpcd when zombie imports or exports exist */
235 obd_zombie_impexp_notify = ptlrpcd_zombie_impexp_notify;
237 rc = cfs_kernel_thread(ptlrpcd, pc, 0);
239 ptlrpc_set_destroy(pc->pc_set);
243 wait_for_completion(&pc->pc_starting);
246 liblustre_register_wait_callback(&ptlrpcd_check_async_rpcs, pc);
252 static void ptlrpcd_stop(struct ptlrpcd_ctl *pc)
254 set_bit(LIOD_STOP, &pc->pc_flags);
255 cfs_waitq_signal(&pc->pc_waitq);
257 obd_zombie_impexp_notify = NULL;
258 wait_for_completion(&pc->pc_finishing);
260 liblustre_deregister_wait_callback(pc->pc_callback);
262 ptlrpc_set_destroy(pc->pc_set);
265 int ptlrpcd_addref(void)
270 mutex_down(&ptlrpcd_sem);
271 if (++ptlrpcd_users != 1)
274 rc = ptlrpcd_start("ptlrpcd", &ptlrpcd_pc);
280 rc = ptlrpcd_start("ptlrpcd-recov", &ptlrpcd_recovery_pc);
282 ptlrpcd_stop(&ptlrpcd_pc);
287 mutex_up(&ptlrpcd_sem);
291 void ptlrpcd_decref(void)
293 mutex_down(&ptlrpcd_sem);
294 if (--ptlrpcd_users == 0) {
295 ptlrpcd_stop(&ptlrpcd_pc);
296 ptlrpcd_stop(&ptlrpcd_recovery_pc);
298 mutex_up(&ptlrpcd_sem);