static int lcw_dispatch_main(void *data)
{
int rc = 0;
unsigned long flags;
struct lc_watchdog *lcw;
CFS_LIST_HEAD (zombies);
ENTRY;
cfs_daemonize("lc_watchdogd");
SIGNAL_MASK_LOCK(current, flags);
sigfillset(¤t->blocked);
RECALC_SIGPENDING;
SIGNAL_MASK_UNLOCK(current, flags);
cfs_complete(&lcw_start_completion);
while (1) {
int dumplog = 1;
cfs_wait_event_interruptible(lcw_event_waitq,
is_watchdog_fired(), rc);
CDEBUG(D_INFO, "Watchdog got woken up...\n");
if (cfs_test_bit(LCW_FLAG_STOP, &lcw_flags)) {
CDEBUG(D_INFO, "LCW_FLAG_STOP was set, shutting down...\n");
cfs_spin_lock_bh(&lcw_pending_timers_lock);
rc = !cfs_list_empty(&lcw_pending_timers);
cfs_spin_unlock_bh(&lcw_pending_timers_lock);
if (rc) {
CERROR("pending timers list was not empty at "
"time of watchdog dispatch shutdown\n");
}
break;
}
cfs_spin_lock_bh(&lcw_pending_timers_lock);
while (!cfs_list_empty(&lcw_pending_timers)) {
int is_dumplog;
lcw = cfs_list_entry(lcw_pending_timers.next,
struct lc_watchdog, lcw_list);
/* +1 ref for callback to make sure lwc wouldn't be
* deleted after releasing lcw_pending_timers_lock */
lcw->lcw_refcount++;
cfs_spin_unlock_bh(&lcw_pending_timers_lock);
/* lock ordering */
cfs_spin_lock_bh(&lcw->lcw_lock);
cfs_spin_lock_bh(&lcw_pending_timers_lock);
if (cfs_list_empty(&lcw->lcw_list)) {
/* already removed from pending list */
lcw->lcw_refcount--; /* -1 ref for callback */
if (lcw->lcw_refcount == 0)
cfs_list_add(&lcw->lcw_list, &zombies);
cfs_spin_unlock_bh(&lcw->lcw_lock);
/* still hold lcw_pending_timers_lock */
continue;
}
cfs_list_del_init(&lcw->lcw_list);
lcw->lcw_refcount--; /* -1 ref for pending list */
cfs_spin_unlock_bh(&lcw_pending_timers_lock);
cfs_spin_unlock_bh(&lcw->lcw_lock);
CDEBUG(D_INFO, "found lcw for pid " LPPID "\n",
lcw->lcw_pid);
lcw_dump_stack(lcw);
is_dumplog = lcw->lcw_callback == lc_watchdog_dumplog;
if (lcw->lcw_state != LC_WATCHDOG_DISABLED &&
(dumplog || !is_dumplog)) {
lcw->lcw_callback(lcw->lcw_pid, lcw->lcw_data);
if (dumplog && is_dumplog)
dumplog = 0;
}
cfs_spin_lock_bh(&lcw_pending_timers_lock);
lcw->lcw_refcount--; /* -1 ref for callback */
if (lcw->lcw_refcount == 0)
cfs_list_add(&lcw->lcw_list, &zombies);
}
cfs_spin_unlock_bh(&lcw_pending_timers_lock);
while (!cfs_list_empty(&zombies)) {
lcw = cfs_list_entry(lcw_pending_timers.next,
struct lc_watchdog, lcw_list);
cfs_list_del(&lcw->lcw_list);
LIBCFS_FREE(lcw, sizeof(*lcw));
}
}
cfs_complete(&lcw_stop_completion);
RETURN(rc);
}
static int lcw_dispatch_main(void *data)
{
int rc = 0;
struct lc_watchdog *lcw;
struct list_head zombies = LIST_HEAD_INIT(zombies);
ENTRY;
complete(&lcw_start_completion);
while (1) {
int dumplog = 1;
rc = wait_event_interruptible(lcw_event_waitq,
is_watchdog_fired());
CDEBUG(D_INFO, "Watchdog got woken up...\n");
if (test_bit(LCW_FLAG_STOP, &lcw_flags)) {
CDEBUG(D_INFO, "LCW_FLAG_STOP set, shutting down...\n");
spin_lock_bh(&lcw_pending_timers_lock);
rc = !list_empty(&lcw_pending_timers);
spin_unlock_bh(&lcw_pending_timers_lock);
if (rc) {
CERROR("pending timers list was not empty at "
"time of watchdog dispatch shutdown\n");
}
break;
}
spin_lock_bh(&lcw_pending_timers_lock);
while (!list_empty(&lcw_pending_timers)) {
int is_dumplog;
lcw = list_entry(lcw_pending_timers.next,
struct lc_watchdog, lcw_list);
/* +1 ref for callback to make sure lwc wouldn't be
* deleted after releasing lcw_pending_timers_lock */
lcw->lcw_refcount++;
spin_unlock_bh(&lcw_pending_timers_lock);
/* lock ordering */
spin_lock_bh(&lcw->lcw_lock);
spin_lock_bh(&lcw_pending_timers_lock);
if (list_empty(&lcw->lcw_list)) {
/* already removed from pending list */
lcw->lcw_refcount--; /* -1 ref for callback */
if (lcw->lcw_refcount == 0)
list_add(&lcw->lcw_list, &zombies);
spin_unlock_bh(&lcw->lcw_lock);
/* still hold lcw_pending_timers_lock */
continue;
}
list_del_init(&lcw->lcw_list);
lcw->lcw_refcount--; /* -1 ref for pending list */
spin_unlock_bh(&lcw_pending_timers_lock);
spin_unlock_bh(&lcw->lcw_lock);
CDEBUG(D_INFO, "found lcw for pid " LPPID "\n",
lcw->lcw_pid);
lcw_dump_stack(lcw);
is_dumplog = lcw->lcw_callback == lc_watchdog_dumplog;
if (lcw->lcw_state != LC_WATCHDOG_DISABLED &&
(dumplog || !is_dumplog)) {
lcw->lcw_callback(lcw->lcw_pid, lcw->lcw_data);
if (dumplog && is_dumplog)
dumplog = 0;
}
spin_lock_bh(&lcw_pending_timers_lock);
lcw->lcw_refcount--; /* -1 ref for callback */
if (lcw->lcw_refcount == 0)
list_add(&lcw->lcw_list, &zombies);
}
spin_unlock_bh(&lcw_pending_timers_lock);
while (!list_empty(&zombies)) {
lcw = list_entry(zombies.next,
struct lc_watchdog, lcw_list);
list_del_init(&lcw->lcw_list);
LIBCFS_FREE(lcw, sizeof(*lcw));
}
}
complete(&lcw_stop_completion);
RETURN(rc);
}
