#define FSCACHE_COOKIE_LOOKING_UP 0 /* T if non-index cookie being looked up still */
#define FSCACHE_COOKIE_CREATING 1 /* T if non-index object being created still */
#define FSCACHE_COOKIE_NO_DATA_YET 2 /* T if new object with no cached data yet */
-#define FSCACHE_COOKIE_PENDING_FILL 3 /* T if pending initial fill on object */
-#define FSCACHE_COOKIE_FILLING 4 /* T if filling object incrementally */
-#define FSCACHE_COOKIE_UNAVAILABLE 5 /* T if cookie is unavailable (error, etc) */
-#define FSCACHE_COOKIE_WAITING_ON_READS 6 /* T if cookie is waiting on reads */
-#define FSCACHE_COOKIE_INVALIDATING 7 /* T if cookie is being invalidated */
+#define FSCACHE_COOKIE_UNAVAILABLE 3 /* T if cookie is unavailable (error, etc) */
+#define FSCACHE_COOKIE_WAITING_ON_READS 4 /* T if cookie is waiting on reads */
+#define FSCACHE_COOKIE_INVALIDATING 5 /* T if cookie is being invalidated */
};
extern struct fscache_cookie fscache_fsdef_index;
* Event list for fscache_object::{event_mask,events}
*/
enum {
- FSCACHE_OBJECT_EV_REQUEUE, /* T if object should be requeued */
+ FSCACHE_OBJECT_EV_NEW_CHILD, /* T if object has a new child */
+ FSCACHE_OBJECT_EV_PARENT_READY, /* T if object's parent is ready */
FSCACHE_OBJECT_EV_UPDATE, /* T if object should be updated */
FSCACHE_OBJECT_EV_INVALIDATE, /* T if cache requested object invalidation */
FSCACHE_OBJECT_EV_CLEARED, /* T if accessors all gone */
FSCACHE_OBJECT_EV_ERROR, /* T if fatal error occurred during processing */
- FSCACHE_OBJECT_EV_RELEASE, /* T if netfs requested object release */
- FSCACHE_OBJECT_EV_RETIRE, /* T if netfs requested object retirement */
- FSCACHE_OBJECT_EV_WITHDRAW, /* T if cache requested object withdrawal */
+ FSCACHE_OBJECT_EV_KILL, /* T if netfs relinquished or cache withdrew object */
NR_FSCACHE_OBJECT_EVENTS
};
#define FSCACHE_OBJECT_EVENTS_MASK ((1UL << NR_FSCACHE_OBJECT_EVENTS) - 1)
+/*
+ * States for object state machine.
+ */
+struct fscache_transition {
+ unsigned long events;
+ const struct fscache_state *transit_to;
+};
+
+struct fscache_state {
+ char name[24];
+ char short_name[8];
+ const struct fscache_state *(*work)(struct fscache_object *object,
+ int event);
+ const struct fscache_transition transitions[];
+};
+
/*
* on-disk cache file or index handle
*/
struct fscache_object {
- enum fscache_object_state {
- FSCACHE_OBJECT_INIT, /* object in initial unbound state */
- FSCACHE_OBJECT_LOOKING_UP, /* looking up object */
- FSCACHE_OBJECT_CREATING, /* creating object */
-
- /* active states */
- FSCACHE_OBJECT_AVAILABLE, /* cleaning up object after creation */
- FSCACHE_OBJECT_ACTIVE, /* object is usable */
- FSCACHE_OBJECT_INVALIDATING, /* object is invalidating */
- FSCACHE_OBJECT_UPDATING, /* object is updating */
-
- /* terminal states */
- FSCACHE_OBJECT_DYING, /* object waiting for accessors to finish */
- FSCACHE_OBJECT_LC_DYING, /* object cleaning up after lookup/create */
- FSCACHE_OBJECT_ABORT_INIT, /* abort the init state */
- FSCACHE_OBJECT_RELEASING, /* releasing object */
- FSCACHE_OBJECT_RECYCLING, /* retiring object */
- FSCACHE_OBJECT_WITHDRAWING, /* withdrawing object */
- FSCACHE_OBJECT_DEAD, /* object is now dead */
- FSCACHE_OBJECT__NSTATES
- } state;
-
+ const struct fscache_state *state; /* Object state machine state */
+ const struct fscache_transition *oob_table; /* OOB state transition table */
int debug_id; /* debugging ID */
int n_children; /* number of child objects */
int n_ops; /* number of extant ops on object */
spinlock_t lock; /* state and operations lock */
unsigned long lookup_jif; /* time at which lookup started */
+ unsigned long oob_event_mask; /* OOB events this object is interested in */
unsigned long event_mask; /* events this object is interested in */
unsigned long events; /* events to be processed by this object
* (order is important - using fls) */
#define FSCACHE_OBJECT_LOCK 0 /* T if object is busy being processed */
#define FSCACHE_OBJECT_PENDING_WRITE 1 /* T if object has pending write */
#define FSCACHE_OBJECT_WAITING 2 /* T if object is waiting on its parent */
+#define FSCACHE_OBJECT_RETIRE 3 /* T if object should be retired */
+#define FSCACHE_OBJECT_IS_LIVE 4 /* T if object is not withdrawn or relinquished */
+#define FSCACHE_OBJECT_IS_LOOKED_UP 5 /* T if object has been looked up */
+#define FSCACHE_OBJECT_IS_AVAILABLE 6 /* T if object has become active */
struct list_head cache_link; /* link in cache->object_list */
struct hlist_node cookie_link; /* link in cookie->backing_objects */
loff_t store_limit_l; /* current storage limit */
};
-extern const char *fscache_object_states[];
-
-#define fscache_object_is_active(obj) \
- (!test_bit(FSCACHE_IOERROR, &(obj)->cache->flags) && \
- (obj)->state >= FSCACHE_OBJECT_AVAILABLE && \
- (obj)->state < FSCACHE_OBJECT_DYING)
-
-#define fscache_object_is_dead(obj) \
- (test_bit(FSCACHE_IOERROR, &(obj)->cache->flags) && \
- (obj)->state >= FSCACHE_OBJECT_DYING)
-
-extern void fscache_object_work_func(struct work_struct *work);
-
-/**
- * fscache_object_init - Initialise a cache object description
- * @object: Object description
- *
- * Initialise a cache object description to its basic values.
- *
- * See Documentation/filesystems/caching/backend-api.txt for a complete
- * description.
- */
-static inline
-void fscache_object_init(struct fscache_object *object,
- struct fscache_cookie *cookie,
- struct fscache_cache *cache)
-{
- atomic_inc(&cache->object_count);
-
- object->state = FSCACHE_OBJECT_INIT;
- spin_lock_init(&object->lock);
- INIT_LIST_HEAD(&object->cache_link);
- INIT_HLIST_NODE(&object->cookie_link);
- INIT_WORK(&object->work, fscache_object_work_func);
- INIT_LIST_HEAD(&object->dependents);
- INIT_LIST_HEAD(&object->dep_link);
- INIT_LIST_HEAD(&object->pending_ops);
- object->n_children = 0;
- object->n_ops = object->n_in_progress = object->n_exclusive = 0;
- object->events = object->event_mask = 0;
- object->flags = 0;
- object->store_limit = 0;
- object->store_limit_l = 0;
- object->cache = cache;
- object->cookie = cookie;
- object->parent = NULL;
-}
+extern void fscache_object_init(struct fscache_object *, struct fscache_cookie *,
+ struct fscache_cache *);
extern void fscache_object_lookup_negative(struct fscache_object *object);
extern void fscache_obtained_object(struct fscache_object *object);
#define fscache_object_destroy(object) do {} while(0)
#endif
+static inline bool fscache_object_is_live(struct fscache_object *object)
+{
+ return test_bit(FSCACHE_OBJECT_IS_LIVE, &object->flags);
+}
+
+static inline bool fscache_object_is_dying(struct fscache_object *object)
+{
+ return !fscache_object_is_live(object);
+}
+
+static inline bool fscache_object_is_available(struct fscache_object *object)
+{
+ return test_bit(FSCACHE_OBJECT_IS_AVAILABLE, &object->flags);
+}
+
+static inline bool fscache_object_is_active(struct fscache_object *object)
+{
+ return fscache_object_is_available(object) &&
+ fscache_object_is_live(object) &&
+ !test_bit(FSCACHE_IOERROR, &object->cache->flags);
+}
+
+static inline bool fscache_object_is_dead(struct fscache_object *object)
+{
+ return fscache_object_is_dying(object) &&
+ test_bit(FSCACHE_IOERROR, &object->cache->flags);
+}
+
/**
* fscache_object_destroyed - Note destruction of an object in a cache
* @cache: The cache from which the object came
projects / ~andy / linux / blobdiff