static int dlm_purge_lockres(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res)
{
int master;
int ret = 0;
spin_lock(&res->spinlock);
if (!__dlm_lockres_unused(res)) {
spin_unlock(&res->spinlock);
mlog(0, "%s:%.*s: tried to purge but not unused\n",
dlm->name, res->lockname.len, res->lockname.name);
return -ENOTEMPTY;
}
master = (res->owner == dlm->node_num);
if (!master)
res->state |= DLM_LOCK_RES_DROPPING_REF;
spin_unlock(&res->spinlock);
mlog(0, "purging lockres %.*s, master = %d\n", res->lockname.len,
res->lockname.name, master);
if (!master) {
spin_lock(&res->spinlock);
/* This ensures that clear refmap is sent after the set */
__dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
spin_unlock(&res->spinlock);
/* drop spinlock to do messaging, retake below */
spin_unlock(&dlm->spinlock);
/* clear our bit from the master's refmap, ignore errors */
ret = dlm_drop_lockres_ref(dlm, res);
if (ret < 0) {
mlog_errno(ret);
if (!dlm_is_host_down(ret))
BUG();
}
mlog(0, "%s:%.*s: dlm_deref_lockres returned %d\n",
dlm->name, res->lockname.len, res->lockname.name, ret);
spin_lock(&dlm->spinlock);
}
if (!list_empty(&res->purge)) {
mlog(0, "removing lockres %.*s:%p from purgelist, "
"master = %d\n", res->lockname.len, res->lockname.name,
res, master);
list_del_init(&res->purge);
dlm_lockres_put(res);
dlm->purge_count--;
}
__dlm_unhash_lockres(res);
/* lockres is not in the hash now. drop the flag and wake up
* any processes waiting in dlm_get_lock_resource. */
if (!master) {
spin_lock(&res->spinlock);
res->state &= ~DLM_LOCK_RES_DROPPING_REF;
spin_unlock(&res->spinlock);
wake_up(&res->wq);
}
return 0;
}
static void dlm_purge_lockres(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res)
{
int master;
int ret = 0;
assert_spin_locked(&dlm->spinlock);
assert_spin_locked(&res->spinlock);
master = (res->owner == dlm->node_num);
mlog(0, "%s: Purging res %.*s, master %d\n", dlm->name,
res->lockname.len, res->lockname.name, master);
if (!master) {
res->state |= DLM_LOCK_RES_DROPPING_REF;
spin_unlock(&res->spinlock);
spin_unlock(&dlm->spinlock);
spin_lock(&res->spinlock);
__dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
spin_unlock(&res->spinlock);
ret = dlm_drop_lockres_ref(dlm, res);
if (ret < 0) {
if (!dlm_is_host_down(ret))
BUG();
}
spin_lock(&dlm->spinlock);
spin_lock(&res->spinlock);
}
if (!list_empty(&res->purge)) {
mlog(0, "%s: Removing res %.*s from purgelist, master %d\n",
dlm->name, res->lockname.len, res->lockname.name, master);
list_del_init(&res->purge);
dlm_lockres_put(res);
dlm->purge_count--;
}
if (!__dlm_lockres_unused(res)) {
mlog(ML_ERROR, "%s: res %.*s in use after deref\n",
dlm->name, res->lockname.len, res->lockname.name);
__dlm_print_one_lock_resource(res);
BUG();
}
__dlm_unhash_lockres(dlm, res);
if (!master) {
res->state &= ~DLM_LOCK_RES_DROPPING_REF;
spin_unlock(&res->spinlock);
wake_up(&res->wq);
} else
spin_unlock(&res->spinlock);
}
/* TODO: Eventual API: Called with the dlm spinlock held, may drop it
* to do migration, but will re-acquire before exit. */
void dlm_purge_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *lockres)
{
int master;
int ret;
spin_lock(&lockres->spinlock);
master = lockres->owner == dlm->node_num;
spin_unlock(&lockres->spinlock);
mlog(0, "purging lockres %.*s, master = %d\n", lockres->lockname.len,
lockres->lockname.name, master);
/* Non master is the easy case -- no migration required, just
* quit. */
if (!master)
goto finish;
/* Wheee! Migrate lockres here! */
spin_unlock(&dlm->spinlock);
again:
ret = dlm_migrate_lockres(dlm, lockres, O2NM_MAX_NODES);
if (ret == -ENOTEMPTY) {
mlog(ML_ERROR, "lockres %.*s still has local locks!\n",
lockres->lockname.len, lockres->lockname.name);
BUG();
} else if (ret < 0) {
mlog(ML_NOTICE, "lockres %.*s: migrate failed, retrying\n",
lockres->lockname.len, lockres->lockname.name);
goto again;
}
spin_lock(&dlm->spinlock);
finish:
if (!list_empty(&lockres->purge)) {
list_del_init(&lockres->purge);
dlm->purge_count--;
}
__dlm_unhash_lockres(lockres);
}
static void dlm_purge_lockres(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res)
{
int master;
int ret = 0;
assert_spin_locked(&dlm->spinlock);
assert_spin_locked(&res->spinlock);
master = (res->owner == dlm->node_num);
mlog(0, "%s: Purging res %.*s, master %d\n", dlm->name,
res->lockname.len, res->lockname.name, master);
if (!master) {
res->state |= DLM_LOCK_RES_DROPPING_REF;
/* drop spinlock... retake below */
spin_unlock(&res->spinlock);
spin_unlock(&dlm->spinlock);
spin_lock(&res->spinlock);
/* This ensures that clear refmap is sent after the set */
__dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
spin_unlock(&res->spinlock);
/* clear our bit from the master's refmap, ignore errors */
ret = dlm_drop_lockres_ref(dlm, res);
if (ret < 0) {
if (!dlm_is_host_down(ret))
BUG();
}
spin_lock(&dlm->spinlock);
spin_lock(&res->spinlock);
}
if (!list_empty(&res->purge)) {
mlog(0, "%s: Removing res %.*s from purgelist, master %d\n",
dlm->name, res->lockname.len, res->lockname.name, master);
list_del_init(&res->purge);
dlm_lockres_put(res);
dlm->purge_count--;
}
if (!__dlm_lockres_unused(res)) {
mlog(ML_ERROR, "%s: res %.*s in use after deref\n",
dlm->name, res->lockname.len, res->lockname.name);
__dlm_print_one_lock_resource(res);
BUG();
}
__dlm_unhash_lockres(dlm, res);
/* lockres is not in the hash now. drop the flag and wake up
* any processes waiting in dlm_get_lock_resource. */
if (!master) {
res->state &= ~DLM_LOCK_RES_DROPPING_REF;
spin_unlock(&res->spinlock);
wake_up(&res->wq);
} else
spin_unlock(&res->spinlock);
}
