EXPORT_SYMBOL(obdo_cachep);
static struct kmem_cache *import_cachep;
-static struct list_head obd_zombie_imports;
-static struct list_head obd_zombie_exports;
-static spinlock_t obd_zombie_impexp_lock;
-static void obd_zombie_impexp_notify(void);
+static struct workqueue_struct *zombie_wq;
static void obd_zombie_export_add(struct obd_export *exp);
static void obd_zombie_import_add(struct obd_import *imp);
}
EXPORT_SYMBOL(class_export_put);
+static void obd_zombie_exp_cull(struct work_struct *ws)
+{
+ struct obd_export *export = container_of(ws, struct obd_export, exp_zombie_work);
+
+ class_export_destroy(export);
+}
+
/* Creates a new export, adds it to the hash table, and returns a
* pointer to it. The refcount is 2: one for the hash reference, and
* one for the pointer returned by this function.
INIT_HLIST_NODE(&export->exp_uuid_hash);
spin_lock_init(&export->exp_bl_list_lock);
INIT_LIST_HEAD(&export->exp_bl_list);
+ INIT_WORK(&export->exp_zombie_work, obd_zombie_exp_cull);
export->exp_sp_peer = LUSTRE_SP_ANY;
export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID;
void class_import_put(struct obd_import *imp)
{
- LASSERT(list_empty(&imp->imp_zombie_chain));
LASSERT_ATOMIC_GT_LT(&imp->imp_refcount, 0, LI_POISON);
CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
}
}
+static void obd_zombie_imp_cull(struct work_struct *ws)
+{
+ struct obd_import *import = container_of(ws, struct obd_import, imp_zombie_work);
+
+ class_import_destroy(import);
+}
+
struct obd_import *class_new_import(struct obd_device *obd)
{
struct obd_import *imp;
return NULL;
INIT_LIST_HEAD(&imp->imp_pinger_chain);
- INIT_LIST_HEAD(&imp->imp_zombie_chain);
INIT_LIST_HEAD(&imp->imp_replay_list);
INIT_LIST_HEAD(&imp->imp_sending_list);
INIT_LIST_HEAD(&imp->imp_delayed_list);
imp->imp_obd = class_incref(obd, "import", imp);
mutex_init(&imp->imp_sec_mutex);
init_waitqueue_head(&imp->imp_recovery_waitq);
+ INIT_WORK(&imp->imp_zombie_work, obd_zombie_imp_cull);
atomic_set(&imp->imp_refcount, 2);
atomic_set(&imp->imp_unregistering, 0);
void (*class_export_dump_hook)(struct obd_export *) = NULL;
#endif
-/* Total amount of zombies to be destroyed */
-static int zombies_count;
-
-/**
- * kill zombie imports and exports
- */
-static void obd_zombie_impexp_cull(void)
-{
- struct obd_import *import;
- struct obd_export *export;
-
- do {
- spin_lock(&obd_zombie_impexp_lock);
-
- import = NULL;
- if (!list_empty(&obd_zombie_imports)) {
- import = list_entry(obd_zombie_imports.next,
- struct obd_import,
- imp_zombie_chain);
- list_del_init(&import->imp_zombie_chain);
- }
-
- export = NULL;
- if (!list_empty(&obd_zombie_exports)) {
- export = list_entry(obd_zombie_exports.next,
- struct obd_export,
- exp_obd_chain);
- list_del_init(&export->exp_obd_chain);
- }
-
- spin_unlock(&obd_zombie_impexp_lock);
-
- if (import) {
- class_import_destroy(import);
- spin_lock(&obd_zombie_impexp_lock);
- zombies_count--;
- spin_unlock(&obd_zombie_impexp_lock);
- }
-
- if (export) {
- class_export_destroy(export);
- spin_lock(&obd_zombie_impexp_lock);
- zombies_count--;
- spin_unlock(&obd_zombie_impexp_lock);
- }
-
- cond_resched();
- } while (import || export);
-}
-
-static struct completion obd_zombie_start;
-static struct completion obd_zombie_stop;
-static unsigned long obd_zombie_flags;
-static wait_queue_head_t obd_zombie_waitq;
-static pid_t obd_zombie_pid;
-
-enum {
- OBD_ZOMBIE_STOP = 0x0001,
-};
-
-/**
- * check for work for kill zombie import/export thread.
- */
-static int obd_zombie_impexp_check(void *arg)
-{
- int rc;
-
- spin_lock(&obd_zombie_impexp_lock);
- rc = (zombies_count == 0) &&
- !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
- spin_unlock(&obd_zombie_impexp_lock);
-
- return rc;
-}
-
/**
* Add export to the obd_zombie thread and notify it.
*/
LASSERT(!list_empty(&exp->exp_obd_chain));
list_del_init(&exp->exp_obd_chain);
spin_unlock(&exp->exp_obd->obd_dev_lock);
- spin_lock(&obd_zombie_impexp_lock);
- zombies_count++;
- list_add(&exp->exp_obd_chain, &obd_zombie_exports);
- spin_unlock(&obd_zombie_impexp_lock);
-
- obd_zombie_impexp_notify();
+ queue_work(zombie_wq, &exp->exp_zombie_work);
}
/**
static void obd_zombie_import_add(struct obd_import *imp)
{
LASSERT(!imp->imp_sec);
- spin_lock(&obd_zombie_impexp_lock);
- LASSERT(list_empty(&imp->imp_zombie_chain));
- zombies_count++;
- list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
- spin_unlock(&obd_zombie_impexp_lock);
-
- obd_zombie_impexp_notify();
-}
-
-/**
- * notify import/export destroy thread about new zombie.
- */
-static void obd_zombie_impexp_notify(void)
-{
- /*
- * Make sure obd_zombie_impexp_thread get this notification.
- * It is possible this signal only get by obd_zombie_barrier, and
- * barrier gulps this notification and sleeps away and hangs ensues
- */
- wake_up_all(&obd_zombie_waitq);
-}
-
-/**
- * check whether obd_zombie is idle
- */
-static int obd_zombie_is_idle(void)
-{
- int rc;
-
- LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags));
- spin_lock(&obd_zombie_impexp_lock);
- rc = (zombies_count == 0);
- spin_unlock(&obd_zombie_impexp_lock);
- return rc;
+ queue_work(zombie_wq, &imp->imp_zombie_work);
}
/**
*/
void obd_zombie_barrier(void)
{
- if (obd_zombie_pid == current_pid())
- /* don't wait for myself */
- return;
- wait_event_idle(obd_zombie_waitq, obd_zombie_is_idle());
+ flush_workqueue(zombie_wq);
}
EXPORT_SYMBOL(obd_zombie_barrier);
-/**
- * destroy zombie export/import thread.
- */
-static int obd_zombie_impexp_thread(void *unused)
-{
- unshare_fs_struct();
- complete(&obd_zombie_start);
-
- obd_zombie_pid = current_pid();
-
- while (!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
- wait_event_idle(obd_zombie_waitq,
- !obd_zombie_impexp_check(NULL));
- obd_zombie_impexp_cull();
-
- /*
- * Notify obd_zombie_barrier callers that queues
- * may be empty.
- */
- wake_up(&obd_zombie_waitq);
- }
-
- complete(&obd_zombie_stop);
-
- return 0;
-}
-
/**
* start destroy zombie import/export thread
*/
int obd_zombie_impexp_init(void)
{
- struct task_struct *task;
-
- INIT_LIST_HEAD(&obd_zombie_imports);
- INIT_LIST_HEAD(&obd_zombie_exports);
- spin_lock_init(&obd_zombie_impexp_lock);
- init_completion(&obd_zombie_start);
- init_completion(&obd_zombie_stop);
- init_waitqueue_head(&obd_zombie_waitq);
- obd_zombie_pid = 0;
-
- task = kthread_run(obd_zombie_impexp_thread, NULL, "obd_zombid");
- if (IS_ERR(task))
- return PTR_ERR(task);
+ zombie_wq = alloc_workqueue("obd_zombid", 0, 0);
+ if (!zombie_wq)
+ return -ENOMEM;
- wait_for_completion(&obd_zombie_start);
return 0;
}
*/
void obd_zombie_impexp_stop(void)
{
- set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
- obd_zombie_impexp_notify();
- wait_for_completion(&obd_zombie_stop);
+ destroy_workqueue(zombie_wq);
}
struct obd_request_slot_waiter {
projects / platform / kernel / linux-starfive.git / commitdiff