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/ctype.h>
47 # include <linux/init.h>
52 #include <linux/lustre_ha.h>
53 #include <linux/obd_support.h> /* for OBD_FAIL_CHECK */
54 #include <linux/lprocfs_status.h>
57 static struct ptlrpcd_ctl {
58 unsigned long pc_flags;
60 struct completion pc_starting;
61 struct completion pc_finishing;
62 struct list_head pc_req_list;
63 wait_queue_head_t pc_waitq;
64 struct ptlrpc_request_set *pc_set;
67 static DECLARE_MUTEX(ptlrpcd_sem);
68 static int ptlrpcd_users = 0;
70 void ptlrpcd_wake(void)
72 struct ptlrpcd_ctl *pc = &ptlrpcd_pc;
73 wake_up(&pc->pc_waitq);
76 void ptlrpcd_add_req(struct ptlrpc_request *req)
78 struct ptlrpcd_ctl *pc = &ptlrpcd_pc;
80 ptlrpc_set_add_new_req(pc->pc_set, req);
84 static int ptlrpcd_check(struct ptlrpcd_ctl *pc)
86 struct list_head *tmp, *pos;
87 struct ptlrpc_request *req;
92 if (test_bit(LIOD_STOP, &pc->pc_flags))
95 spin_lock_irqsave(&pc->pc_set->set_new_req_lock, flags);
96 list_for_each_safe(pos, tmp, &pc->pc_set->set_new_requests) {
97 req = list_entry(pos, struct ptlrpc_request, rq_set_chain);
98 list_del_init(&req->rq_set_chain);
99 ptlrpc_set_add_req(pc->pc_set, req);
100 rc = 1; /* need to calculate its timeout */
102 spin_unlock_irqrestore(&pc->pc_set->set_new_req_lock, flags);
104 if (pc->pc_set->set_remaining) {
105 rc = rc | ptlrpc_check_set(pc->pc_set);
107 /* XXX our set never completes, so we prune the completed
108 * reqs after each iteration. boy could this be smarter. */
109 list_for_each_safe(pos, tmp, &pc->pc_set->set_requests) {
110 req = list_entry(pos, struct ptlrpc_request,
112 if (req->rq_phase != RQ_PHASE_COMPLETE)
115 list_del_init(&req->rq_set_chain);
117 ptlrpc_req_finished (req);
125 /* ptlrpc's code paths like to execute in process context, so we have this
126 * thread which spins on a set which contains the io rpcs. llite specifies
127 * ptlrpcd's set when it pushes pages down into the oscs */
128 static int ptlrpcd(void *arg)
130 struct ptlrpcd_ctl *pc = arg;
134 kportal_daemonize("ptlrpcd");
136 SIGNAL_MASK_LOCK(current, flags);
137 sigfillset(¤t->blocked);
139 SIGNAL_MASK_UNLOCK(current, flags);
141 complete(&pc->pc_starting);
143 /* this mainloop strongly resembles ptlrpc_set_wait except
144 * that our set never completes. ptlrpcd_check calls ptlrpc_check_set
145 * when there are requests in the set. new requests come in
146 * on the set's new_req_list and ptlrpcd_check moves them into
149 wait_queue_t set_wait;
150 struct l_wait_info lwi;
153 timeout = ptlrpc_set_next_timeout(pc->pc_set) * HZ;
154 lwi = LWI_TIMEOUT(timeout, ptlrpc_expired_set, pc->pc_set);
156 /* ala the pinger, wait on pc's waitqueue and the set's */
157 init_waitqueue_entry(&set_wait, current);
158 add_wait_queue(&pc->pc_set->set_waitq, &set_wait);
159 l_wait_event(pc->pc_waitq, ptlrpcd_check(pc), &lwi);
160 remove_wait_queue(&pc->pc_set->set_waitq, &set_wait);
162 if (test_bit(LIOD_STOP, &pc->pc_flags))
165 /* XXX should be making sure we don't have anything in flight */
166 complete(&pc->pc_finishing);
170 static int ptlrpcd_recurred = 0;
171 static void *ptlrpcd_callback;
173 int ptlrpcd_check_async_rpcs(void *arg)
175 struct ptlrpcd_ctl *pc = arg;
178 /* single threaded!! */
181 if (ptlrpcd_recurred == 1)
182 rc = ptlrpcd_check(pc);
189 int ptlrpcd_addref(void)
191 struct ptlrpcd_ctl *pc = &ptlrpcd_pc;
196 if (++ptlrpcd_users != 1)
199 memset(pc, 0, sizeof(*pc));
200 init_completion(&pc->pc_starting);
201 init_completion(&pc->pc_finishing);
202 init_waitqueue_head(&pc->pc_waitq);
204 spin_lock_init(&pc->pc_lock);
205 INIT_LIST_HEAD(&pc->pc_req_list);
207 pc->pc_set = ptlrpc_prep_set();
208 if (pc->pc_set == NULL)
209 GOTO(out, rc = -ENOMEM);
212 if (kernel_thread(ptlrpcd, pc, 0) < 0) {
213 ptlrpc_set_destroy(pc->pc_set);
214 GOTO(out, rc = -ECHILD);
217 wait_for_completion(&pc->pc_starting);
220 liblustre_register_wait_callback(&ptlrpcd_check_async_rpcs, pc);
227 void ptlrpcd_decref(void)
229 struct ptlrpcd_ctl *pc = &ptlrpcd_pc;
232 if (--ptlrpcd_users == 0) {
233 set_bit(LIOD_STOP, &pc->pc_flags);
234 wake_up(&pc->pc_waitq);
236 wait_for_completion(&pc->pc_finishing);
238 liblustre_deregister_wait_callback(ptlrpcd_callback);
240 ptlrpc_set_destroy(pc->pc_set);