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 Lustre, http://www.lustre.org.
9 * Lustre is free software; you can redistribute it and/or
10 * modify it under the terms of version 2 of the GNU General Public
11 * License as published by the Free Software Foundation.
13 * Lustre is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with Lustre; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define DEBUG_SUBSYSTEM S_RPC
27 # include <linux/version.h>
28 # include <linux/module.h>
29 # include <linux/mm.h>
30 # include <linux/highmem.h>
31 # include <linux/lustre_dlm.h>
32 # if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
33 # include <linux/workqueue.h>
34 # include <linux/smp_lock.h>
36 # include <linux/locks.h>
38 #else /* __KERNEL__ */
39 # include <liblustre.h>
42 #include <linux/kp30.h>
43 #include <linux/lustre_net.h>
46 # include <linux/init.h>
51 #include <linux/lustre_ha.h>
52 #include <linux/obd_support.h> /* for OBD_FAIL_CHECK */
53 #include <linux/lprocfs_status.h>
57 unsigned long pc_flags;
59 struct completion pc_starting;
60 struct completion pc_finishing;
61 struct list_head pc_req_list;
62 wait_queue_head_t pc_waitq;
63 struct ptlrpc_request_set *pc_set;
70 static struct ptlrpcd_ctl ptlrpcd_pc;
71 static struct ptlrpcd_ctl ptlrpcd_recovery_pc;
73 static DECLARE_MUTEX(ptlrpcd_sem);
74 static int ptlrpcd_users = 0;
76 void ptlrpcd_wake(struct ptlrpc_request *req)
78 struct ptlrpcd_ctl *pc = req->rq_ptlrpcd_data;
82 wake_up(&pc->pc_waitq);
85 void ptlrpcd_add_req(struct ptlrpc_request *req)
87 struct ptlrpcd_ctl *pc;
89 if (req->rq_send_state == LUSTRE_IMP_FULL)
92 pc = &ptlrpcd_recovery_pc;
94 ptlrpc_set_add_new_req(pc->pc_set, req);
95 req->rq_ptlrpcd_data = pc;
100 static int ptlrpcd_check(struct ptlrpcd_ctl *pc)
102 struct list_head *tmp, *pos;
103 struct ptlrpc_request *req;
108 if (test_bit(LIOD_STOP, &pc->pc_flags))
111 spin_lock_irqsave(&pc->pc_set->set_new_req_lock, flags);
112 list_for_each_safe(pos, tmp, &pc->pc_set->set_new_requests) {
113 req = list_entry(pos, struct ptlrpc_request, rq_set_chain);
114 list_del_init(&req->rq_set_chain);
115 ptlrpc_set_add_req(pc->pc_set, req);
116 rc = 1; /* need to calculate its timeout */
118 spin_unlock_irqrestore(&pc->pc_set->set_new_req_lock, flags);
120 if (pc->pc_set->set_remaining) {
121 rc = rc | ptlrpc_check_set(pc->pc_set);
123 /* XXX our set never completes, so we prune the completed
124 * reqs after each iteration. boy could this be smarter. */
125 list_for_each_safe(pos, tmp, &pc->pc_set->set_requests) {
126 req = list_entry(pos, struct ptlrpc_request,
128 if (req->rq_phase != RQ_PHASE_COMPLETE)
131 list_del_init(&req->rq_set_chain);
133 ptlrpc_req_finished (req);
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 kportal_daemonize("ptlrpcd");
152 SIGNAL_MASK_LOCK(current, flags);
153 sigfillset(¤t->blocked);
155 SIGNAL_MASK_UNLOCK(current, flags);
157 complete(&pc->pc_starting);
159 /* this mainloop strongly resembles ptlrpc_set_wait except
160 * that our set never completes. ptlrpcd_check calls ptlrpc_check_set
161 * when there are requests in the set. new requests come in
162 * on the set's new_req_list and ptlrpcd_check moves them into
165 wait_queue_t set_wait;
166 struct l_wait_info lwi;
169 timeout = ptlrpc_set_next_timeout(pc->pc_set) * HZ;
170 lwi = LWI_TIMEOUT(timeout, ptlrpc_expired_set, pc->pc_set);
172 /* ala the pinger, wait on pc's waitqueue and the set's */
173 init_waitqueue_entry(&set_wait, current);
174 add_wait_queue(&pc->pc_set->set_waitq, &set_wait);
175 l_wait_event(pc->pc_waitq, ptlrpcd_check(pc), &lwi);
176 remove_wait_queue(&pc->pc_set->set_waitq, &set_wait);
178 if (test_bit(LIOD_STOP, &pc->pc_flags))
181 /* wait for inflight requests to drain */
182 if (!list_empty(&pc->pc_set->set_requests))
183 ptlrpc_set_wait(pc->pc_set);
184 complete(&pc->pc_finishing);
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);
205 static int ptlrpcd_start(struct ptlrpcd_ctl *pc)
209 memset(pc, 0, sizeof(*pc));
210 init_completion(&pc->pc_starting);
211 init_completion(&pc->pc_finishing);
212 init_waitqueue_head(&pc->pc_waitq);
214 spin_lock_init(&pc->pc_lock);
215 INIT_LIST_HEAD(&pc->pc_req_list);
217 pc->pc_set = ptlrpc_prep_set();
218 if (pc->pc_set == NULL)
219 GOTO(out, rc = -ENOMEM);
222 if (kernel_thread(ptlrpcd, pc, 0) < 0) {
223 ptlrpc_set_destroy(pc->pc_set);
224 GOTO(out, rc = -ECHILD);
227 wait_for_completion(&pc->pc_starting);
230 liblustre_register_wait_callback(&ptlrpcd_check_async_rpcs, pc);
236 static void ptlrpcd_stop(struct ptlrpcd_ctl *pc)
238 set_bit(LIOD_STOP, &pc->pc_flags);
239 wake_up(&pc->pc_waitq);
241 wait_for_completion(&pc->pc_finishing);
243 liblustre_deregister_wait_callback(pc->pc_callback);
245 ptlrpc_set_destroy(pc->pc_set);
248 int ptlrpcd_addref(void)
254 if (++ptlrpcd_users != 1)
257 rc = ptlrpcd_start(&ptlrpcd_pc);
263 rc = ptlrpcd_start(&ptlrpcd_recovery_pc);
265 ptlrpcd_stop(&ptlrpcd_pc);
274 void ptlrpcd_decref(void)
277 if (--ptlrpcd_users == 0) {
278 ptlrpcd_stop(&ptlrpcd_pc);
279 ptlrpcd_stop(&ptlrpcd_recovery_pc);