void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock)
{
BUG_ON(!dlm);
BUG_ON(!lock);
spin_lock(&dlm->ast_lock);
__dlm_queue_bast(dlm, lock);
spin_unlock(&dlm->ast_lock);
}
static void dlm_shuffle_lists(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res)
{
struct dlm_lock *lock, *target;
struct list_head *iter;
struct list_head *head;
int can_grant = 1;
//mlog(0, "res->lockname.len=%d\n", res->lockname.len);
//mlog(0, "res->lockname.name=%p\n", res->lockname.name);
//mlog(0, "shuffle res %.*s\n", res->lockname.len,
// res->lockname.name);
/* because this function is called with the lockres
* spinlock, and because we know that it is not migrating/
* recovering/in-progress, it is fine to reserve asts and
* basts right before queueing them all throughout */
assert_spin_locked(&dlm->ast_lock);
assert_spin_locked(&res->spinlock);
BUG_ON((res->state & (DLM_LOCK_RES_MIGRATING|
DLM_LOCK_RES_RECOVERING|
DLM_LOCK_RES_IN_PROGRESS)));
converting:
if (list_empty(&res->converting))
goto blocked;
mlog(0, "res %.*s has locks on a convert queue\n", res->lockname.len,
res->lockname.name);
target = list_entry(res->converting.next, struct dlm_lock, list);
if (target->ml.convert_type == LKM_IVMODE) {
mlog(ML_ERROR, "%.*s: converting a lock with no "
"convert_type!\n", res->lockname.len, res->lockname.name);
BUG();
}
head = &res->granted;
list_for_each(iter, head) {
lock = list_entry(iter, struct dlm_lock, list);
if (lock==target)
continue;
if (!dlm_lock_compatible(lock->ml.type,
target->ml.convert_type)) {
can_grant = 0;
/* queue the BAST if not already */
if (lock->ml.highest_blocked == LKM_IVMODE) {
__dlm_lockres_reserve_ast(res);
__dlm_queue_bast(dlm, lock);
}
/* update the highest_blocked if needed */
if (lock->ml.highest_blocked < target->ml.convert_type)
lock->ml.highest_blocked =
target->ml.convert_type;
}
}
static void dlm_shuffle_lists(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res)
{
struct dlm_lock *lock, *target;
struct list_head *iter;
struct list_head *head;
int can_grant = 1;
assert_spin_locked(&dlm->ast_lock);
assert_spin_locked(&res->spinlock);
BUG_ON((res->state & (DLM_LOCK_RES_MIGRATING|
DLM_LOCK_RES_RECOVERING|
DLM_LOCK_RES_IN_PROGRESS)));
converting:
if (list_empty(&res->converting))
goto blocked;
mlog(0, "%s: res %.*s has locks on the convert queue\n", dlm->name,
res->lockname.len, res->lockname.name);
target = list_entry(res->converting.next, struct dlm_lock, list);
if (target->ml.convert_type == LKM_IVMODE) {
mlog(ML_ERROR, "%s: res %.*s converting lock to invalid mode\n",
dlm->name, res->lockname.len, res->lockname.name);
BUG();
}
head = &res->granted;
list_for_each(iter, head) {
lock = list_entry(iter, struct dlm_lock, list);
if (lock==target)
continue;
if (!dlm_lock_compatible(lock->ml.type,
target->ml.convert_type)) {
can_grant = 0;
if (lock->ml.highest_blocked == LKM_IVMODE) {
__dlm_lockres_reserve_ast(res);
__dlm_queue_bast(dlm, lock);
}
if (lock->ml.highest_blocked < target->ml.convert_type)
lock->ml.highest_blocked =
target->ml.convert_type;
}
}