static void dlm_run_purge_list(struct dlm_ctxt *dlm,
int purge_now)
{
unsigned int run_max, unused;
unsigned long purge_jiffies;
struct dlm_lock_resource *lockres;
spin_lock(&dlm->spinlock);
run_max = dlm->purge_count;
while(run_max && !list_empty(&dlm->purge_list)) {
run_max--;
lockres = list_entry(dlm->purge_list.next,
struct dlm_lock_resource, purge);
/* Status of the lockres *might* change so double
* check. If the lockres is unused, holding the dlm
* spinlock will prevent people from getting and more
* refs on it -- there's no need to keep the lockres
* spinlock. */
spin_lock(&lockres->spinlock);
unused = __dlm_lockres_unused(lockres);
spin_unlock(&lockres->spinlock);
if (!unused)
continue;
purge_jiffies = lockres->last_used +
msecs_to_jiffies(DLM_PURGE_INTERVAL_MS);
/* Make sure that we want to be processing this guy at
* this time. */
if (!purge_now && time_after(purge_jiffies, jiffies)) {
/* Since resources are added to the purge list
* in tail order, we can stop at the first
* unpurgable resource -- anyone added after
* him will have a greater last_used value */
break;
}
dlm_lockres_get(lockres);
/* This may drop and reacquire the dlm spinlock if it
* has to do migration. */
if (dlm_purge_lockres(dlm, lockres))
BUG();
dlm_lockres_put(lockres);
/* Avoid adding any scheduling latencies */
cond_resched_lock(&dlm->spinlock);
}
spin_unlock(&dlm->spinlock);
}
static void dlm_run_purge_list(struct dlm_ctxt *dlm,
int purge_now)
{
unsigned int run_max, unused;
unsigned long purge_jiffies;
struct dlm_lock_resource *lockres;
spin_lock(&dlm->spinlock);
run_max = dlm->purge_count;
while(run_max && !list_empty(&dlm->purge_list)) {
run_max--;
lockres = list_entry(dlm->purge_list.next,
struct dlm_lock_resource, purge);
spin_lock(&lockres->spinlock);
purge_jiffies = lockres->last_used +
msecs_to_jiffies(DLM_PURGE_INTERVAL_MS);
if (!purge_now && time_after(purge_jiffies, jiffies)) {
spin_unlock(&lockres->spinlock);
break;
}
unused = __dlm_lockres_unused(lockres);
if (!unused ||
(lockres->state & DLM_LOCK_RES_MIGRATING)) {
mlog(0, "%s: res %.*s is in use or being remastered, "
"used %d, state %d\n", dlm->name,
lockres->lockname.len, lockres->lockname.name,
!unused, lockres->state);
list_move_tail(&dlm->purge_list, &lockres->purge);
spin_unlock(&lockres->spinlock);
continue;
}
dlm_lockres_get(lockres);
dlm_purge_lockres(dlm, lockres);
dlm_lockres_put(lockres);
cond_resched_lock(&dlm->spinlock);
}
spin_unlock(&dlm->spinlock);
}
