diff options
Diffstat (limited to 'include/linux/fscache-cache.h')
| -rw-r--r-- | include/linux/fscache-cache.h | 66 |
1 files changed, 31 insertions, 35 deletions
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h index c5f92347cbf8..9ff516b1b9a0 100644 --- a/include/linux/fscache-cache.h +++ b/include/linux/fscache-cache.h @@ -328,11 +328,9 @@ struct fscache_cookie { #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; @@ -341,45 +339,40 @@ 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 */ @@ -390,6 +383,7 @@ struct fscache_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) */ @@ -398,6 +392,10 @@ struct fscache_object { #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 */ @@ -415,8 +413,6 @@ struct fscache_object { loff_t store_limit_l; /* current storage limit */ }; -extern const char *fscache_object_states[]; - extern void fscache_object_init(struct fscache_object *, struct fscache_cookie *, struct fscache_cache *); @@ -431,7 +427,7 @@ extern void fscache_object_destroy(struct fscache_object *object); static inline bool fscache_object_is_live(struct fscache_object *object) { - return object->state < FSCACHE_OBJECT_DYING; + return test_bit(FSCACHE_OBJECT_IS_LIVE, &object->flags); } static inline bool fscache_object_is_dying(struct fscache_object *object) @@ -441,7 +437,7 @@ static inline bool fscache_object_is_dying(struct fscache_object *object) static inline bool fscache_object_is_available(struct fscache_object *object) { - return object->state >= FSCACHE_OBJECT_AVAILABLE; + return test_bit(FSCACHE_OBJECT_IS_AVAILABLE, &object->flags); } static inline bool fscache_object_is_active(struct fscache_object *object) |