1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * Lustre High Availability Daemon
8 * Copyright (C) 2001, 2002 Cluster File Systems, Inc.
10 * This code is issued under the GNU General Public License.
11 * See the file COPYING in this distribution
13 * by Peter Braam <braam@clusterfs.com>
17 #define DEBUG_SUBSYSTEM S_RPC
19 #include <linux/lustre_lite.h>
20 #include <linux/lustre_ha.h>
21 #include <linux/obd_support.h>
23 /* dump_connection_list, but shorter for nicer debugging logs */
24 static void d_c_l(struct list_head *head)
27 struct list_head *tmp;
29 list_for_each(tmp, head) {
30 struct ptlrpc_connection *conn =
31 list_entry(tmp, struct ptlrpc_connection,
32 c_recovd_data.rd_managed_chain);
33 CDEBUG(D_HA, " %p = %s (%d/%d)\n", conn, conn->c_remote_uuid,
34 conn->c_recovd_data.rd_phase,
35 conn->c_recovd_data.rd_next_phase);
41 static void dump_lists(struct recovd_obd *recovd)
43 CDEBUG(D_HA, "managed: \n");
44 d_c_l(&recovd->recovd_managed_items);
45 CDEBUG(D_HA, "troubled: \n");
46 d_c_l(&recovd->recovd_troubled_items);
49 void recovd_conn_manage(struct ptlrpc_connection *conn,
50 struct recovd_obd *recovd, ptlrpc_recovery_cb_t recover)
52 struct recovd_data *rd = &conn->c_recovd_data;
54 if (!recovd || !recover) {
59 if (!list_empty(&rd->rd_managed_chain)) {
60 if (rd->rd_recovd == recovd && rd->rd_recover == recover) {
61 CDEBUG(D_HA, "conn %p/%s already setup for recovery\n",
62 conn, conn->c_remote_uuid);
67 "conn %p/%s has recovery items %p/%p, making %p/%p\n",
68 conn, conn->c_remote_uuid, rd->rd_recovd, rd->rd_recover,
70 spin_lock(&rd->rd_recovd->recovd_lock);
71 list_del(&rd->rd_managed_chain);
72 spin_unlock(&rd->rd_recovd->recovd_lock);
75 rd->rd_recovd = recovd;
76 rd->rd_recover = recover;
77 rd->rd_phase = RD_IDLE;
78 rd->rd_next_phase = RD_TROUBLED;
80 spin_lock(&recovd->recovd_lock);
81 list_add(&rd->rd_managed_chain, &recovd->recovd_managed_items);
83 spin_unlock(&recovd->recovd_lock);
88 void recovd_conn_fail(struct ptlrpc_connection *conn)
90 struct recovd_data *rd = &conn->c_recovd_data;
91 struct recovd_obd *recovd = rd->rd_recovd;
95 CERROR("no recovd for connection %p\n", conn);
100 spin_lock(&recovd->recovd_lock);
101 if (rd->rd_phase != RD_IDLE) {
102 CERROR("connection %p to %s already in recovery\n",
103 conn, conn->c_remote_uuid);
104 /* XXX need to distinguish from failure-in-recovery */
105 spin_unlock(&recovd->recovd_lock);
110 CERROR("connection %p to %s failed\n", conn, conn->c_remote_uuid);
111 list_del(&rd->rd_managed_chain);
112 list_add_tail(&rd->rd_managed_chain, &recovd->recovd_troubled_items);
113 rd->rd_phase = RD_TROUBLED;
115 spin_unlock(&recovd->recovd_lock);
117 wake_up(&recovd->recovd_waitq);
122 void recovd_conn_fixed(struct ptlrpc_connection *conn)
124 struct recovd_data *rd = &conn->c_recovd_data;
127 CDEBUG(D_HA, "connection %p (now to %s) fixed\n",
128 conn, conn->c_remote_uuid);
129 spin_lock(&rd->rd_recovd->recovd_lock);
130 list_del(&rd->rd_managed_chain);
131 rd->rd_phase = RD_IDLE;
132 rd->rd_next_phase = RD_TROUBLED;
133 list_add(&rd->rd_managed_chain, &rd->rd_recovd->recovd_managed_items);
134 dump_lists(rd->rd_recovd);
135 spin_unlock(&rd->rd_recovd->recovd_lock);
141 static int recovd_check_event(struct recovd_obd *recovd)
144 struct list_head *tmp;
148 spin_lock(&recovd->recovd_lock);
150 if (recovd->recovd_state == RECOVD_STOPPING)
153 list_for_each(tmp, &recovd->recovd_troubled_items) {
155 struct recovd_data *rd = list_entry(tmp, struct recovd_data,
158 if (rd->rd_phase == rd->rd_next_phase ||
159 rd->rd_phase == RD_FAILED)
164 spin_unlock(&recovd->recovd_lock);
168 static int recovd_handle_event(struct recovd_obd *recovd)
170 struct list_head *tmp, *n;
174 spin_lock(&recovd->recovd_lock);
179 * We use _safe here because one of the callbacks, expecially
180 * FAILURE or PREPARED, could move list items around.
182 list_for_each_safe(tmp, n, &recovd->recovd_troubled_items) {
183 struct recovd_data *rd = list_entry(tmp, struct recovd_data,
186 if (rd->rd_phase != RD_FAILED &&
187 rd->rd_phase != rd->rd_next_phase)
190 switch (rd->rd_phase) {
192 cb_failed: /* must always reach here with recovd_lock held! */
193 CERROR("recovery FAILED for rd %p (conn %p): %d\n",
194 rd, class_rd2conn(rd), rc);
196 spin_unlock(&recovd->recovd_lock);
197 (void)rd->rd_recover(rd, PTLRPC_RECOVD_PHASE_FAILURE);
198 spin_lock(&recovd->recovd_lock);
202 if (!rd->rd_recover) {
203 CERROR("no rd_recover for rd %p (conn %p)\n",
204 rd, class_rd2conn(rd));
208 CERROR("starting recovery for rd %p (conn %p)\n",
209 rd, class_rd2conn(rd));
210 rd->rd_phase = RD_PREPARING;
211 rd->rd_next_phase = RD_PREPARED;
213 spin_unlock(&recovd->recovd_lock);
214 rc = rd->rd_recover(rd, PTLRPC_RECOVD_PHASE_PREPARE);
215 spin_lock(&recovd->recovd_lock);
223 CERROR("recovery prepared for rd %p (conn %p)\n",
224 rd, class_rd2conn(rd));
225 rd->rd_phase = RD_RECOVERING;
226 rd->rd_next_phase = RD_RECOVERED;
228 spin_unlock(&recovd->recovd_lock);
229 rc = rd->rd_recover(rd, PTLRPC_RECOVD_PHASE_RECOVER);
230 spin_lock(&recovd->recovd_lock);
237 rd->rd_phase = RD_IDLE;
238 rd->rd_next_phase = RD_TROUBLED;
240 CERROR("recovery complete for rd %p (conn %p)\n",
241 rd, class_rd2conn(rd));
248 spin_unlock(&recovd->recovd_lock);
252 static int recovd_main(void *arg)
254 struct recovd_obd *recovd = (struct recovd_obd *)arg;
260 spin_lock_irq(¤t->sigmask_lock);
261 sigfillset(¤t->blocked);
262 recalc_sigpending(current);
263 spin_unlock_irq(¤t->sigmask_lock);
265 sprintf(current->comm, "lustre_recovd");
268 /* Signal that the thread is running. */
269 recovd->recovd_thread = current;
270 recovd->recovd_state = RECOVD_READY;
271 wake_up(&recovd->recovd_ctl_waitq);
273 /* And now, loop forever on requests. */
275 wait_event(recovd->recovd_waitq, recovd_check_event(recovd));
276 if (recovd->recovd_state == RECOVD_STOPPING)
278 recovd_handle_event(recovd);
281 recovd->recovd_thread = NULL;
282 recovd->recovd_state = RECOVD_STOPPED;
283 wake_up(&recovd->recovd_ctl_waitq);
284 CDEBUG(D_HA, "mgr exiting process %d\n", current->pid);
288 int recovd_setup(struct recovd_obd *recovd)
294 INIT_LIST_HEAD(&recovd->recovd_managed_items);
295 INIT_LIST_HEAD(&recovd->recovd_troubled_items);
296 spin_lock_init(&recovd->recovd_lock);
298 init_waitqueue_head(&recovd->recovd_waitq);
299 init_waitqueue_head(&recovd->recovd_recovery_waitq);
300 init_waitqueue_head(&recovd->recovd_ctl_waitq);
302 rc = kernel_thread(recovd_main, (void *)recovd,
303 CLONE_VM | CLONE_FS | CLONE_FILES);
305 CERROR("cannot start thread\n");
308 wait_event(recovd->recovd_ctl_waitq,
309 recovd->recovd_state == RECOVD_READY);
311 ptlrpc_recovd = recovd;
312 class_signal_connection_failure = recovd_conn_fail;
317 int recovd_cleanup(struct recovd_obd *recovd)
320 spin_lock(&recovd->recovd_lock);
321 recovd->recovd_state = RECOVD_STOPPING;
322 wake_up(&recovd->recovd_waitq);
323 spin_unlock(&recovd->recovd_lock);
325 wait_event(recovd->recovd_ctl_waitq,
326 (recovd->recovd_state == RECOVD_STOPPED));
330 struct recovd_obd *ptlrpc_recovd;