diff options
Diffstat (limited to 'ANDROID_3.4.5/include/linux/sunrpc/cache.h')
| -rw-r--r-- | ANDROID_3.4.5/include/linux/sunrpc/cache.h | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/ANDROID_3.4.5/include/linux/sunrpc/cache.h b/ANDROID_3.4.5/include/linux/sunrpc/cache.h deleted file mode 100644 index f5fd6160..00000000 --- a/ANDROID_3.4.5/include/linux/sunrpc/cache.h +++ /dev/null @@ -1,263 +0,0 @@ -/* - * include/linux/sunrpc/cache.h - * - * Generic code for various authentication-related caches - * used by sunrpc clients and servers. - * - * Copyright (C) 2002 Neil Brown <neilb@cse.unsw.edu.au> - * - * Released under terms in GPL version 2. See COPYING. - * - */ - -#ifndef _LINUX_SUNRPC_CACHE_H_ -#define _LINUX_SUNRPC_CACHE_H_ - -#include <linux/kref.h> -#include <linux/slab.h> -#include <linux/atomic.h> -#include <linux/proc_fs.h> - -/* - * Each cache requires: - * - A 'struct cache_detail' which contains information specific to the cache - * for common code to use. - * - An item structure that must contain a "struct cache_head" - * - A lookup function defined using DefineCacheLookup - * - A 'put' function that can release a cache item. It will only - * be called after cache_put has succeed, so there are guarantee - * to be no references. - * - A function to calculate a hash of an item's key. - * - * as well as assorted code fragments (e.g. compare keys) and numbers - * (e.g. hash size, goal_age, etc). - * - * Each cache must be registered so that it can be cleaned regularly. - * When the cache is unregistered, it is flushed completely. - * - * Entries have a ref count and a 'hashed' flag which counts the existence - * in the hash table. - * We only expire entries when refcount is zero. - * Existence in the cache is counted the refcount. - */ - -/* Every cache item has a common header that is used - * for expiring and refreshing entries. - * - */ -struct cache_head { - struct cache_head * next; - time_t expiry_time; /* After time time, don't use the data */ - time_t last_refresh; /* If CACHE_PENDING, this is when upcall - * was sent, else this is when update was received - */ - struct kref ref; - unsigned long flags; -}; -#define CACHE_VALID 0 /* Entry contains valid data */ -#define CACHE_NEGATIVE 1 /* Negative entry - there is no match for the key */ -#define CACHE_PENDING 2 /* An upcall has been sent but no reply received yet*/ - -#define CACHE_NEW_EXPIRY 120 /* keep new things pending confirmation for 120 seconds */ - -struct cache_detail_procfs { - struct proc_dir_entry *proc_ent; - struct proc_dir_entry *flush_ent, *channel_ent, *content_ent; -}; - -struct cache_detail_pipefs { - struct dentry *dir; -}; - -struct cache_detail { - struct module * owner; - int hash_size; - struct cache_head ** hash_table; - rwlock_t hash_lock; - - atomic_t inuse; /* active user-space update or lookup */ - - char *name; - void (*cache_put)(struct kref *); - - int (*cache_upcall)(struct cache_detail *, - struct cache_head *); - - int (*cache_parse)(struct cache_detail *, - char *buf, int len); - - int (*cache_show)(struct seq_file *m, - struct cache_detail *cd, - struct cache_head *h); - void (*warn_no_listener)(struct cache_detail *cd, - int has_died); - - struct cache_head * (*alloc)(void); - int (*match)(struct cache_head *orig, struct cache_head *new); - void (*init)(struct cache_head *orig, struct cache_head *new); - void (*update)(struct cache_head *orig, struct cache_head *new); - - /* fields below this comment are for internal use - * and should not be touched by cache owners - */ - time_t flush_time; /* flush all cache items with last_refresh - * earlier than this */ - struct list_head others; - time_t nextcheck; - int entries; - - /* fields for communication over channel */ - struct list_head queue; - - atomic_t readers; /* how many time is /chennel open */ - time_t last_close; /* if no readers, when did last close */ - time_t last_warn; /* when we last warned about no readers */ - - union { - struct cache_detail_procfs procfs; - struct cache_detail_pipefs pipefs; - } u; - struct net *net; -}; - - -/* this must be embedded in any request structure that - * identifies an object that will want a callback on - * a cache fill - */ -struct cache_req { - struct cache_deferred_req *(*defer)(struct cache_req *req); - int thread_wait; /* How long (jiffies) we can block the - * current thread to wait for updates. - */ -}; -/* this must be embedded in a deferred_request that is being - * delayed awaiting cache-fill - */ -struct cache_deferred_req { - struct hlist_node hash; /* on hash chain */ - struct list_head recent; /* on fifo */ - struct cache_head *item; /* cache item we wait on */ - void *owner; /* we might need to discard all defered requests - * owned by someone */ - void (*revisit)(struct cache_deferred_req *req, - int too_many); -}; - - -extern const struct file_operations cache_file_operations_pipefs; -extern const struct file_operations content_file_operations_pipefs; -extern const struct file_operations cache_flush_operations_pipefs; - -extern struct cache_head * -sunrpc_cache_lookup(struct cache_detail *detail, - struct cache_head *key, int hash); -extern struct cache_head * -sunrpc_cache_update(struct cache_detail *detail, - struct cache_head *new, struct cache_head *old, int hash); - -extern int -sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h, - void (*cache_request)(struct cache_detail *, - struct cache_head *, - char **, - int *)); - - -extern void cache_clean_deferred(void *owner); - -static inline struct cache_head *cache_get(struct cache_head *h) -{ - kref_get(&h->ref); - return h; -} - - -static inline void cache_put(struct cache_head *h, struct cache_detail *cd) -{ - if (atomic_read(&h->ref.refcount) <= 2 && - h->expiry_time < cd->nextcheck) - cd->nextcheck = h->expiry_time; - kref_put(&h->ref, cd->cache_put); -} - -static inline int cache_valid(struct cache_head *h) -{ - /* If an item has been unhashed pending removal when - * the refcount drops to 0, the expiry_time will be - * set to 0. We don't want to consider such items - * valid in this context even though CACHE_VALID is - * set. - */ - return (h->expiry_time != 0 && test_bit(CACHE_VALID, &h->flags)); -} - -extern int cache_check(struct cache_detail *detail, - struct cache_head *h, struct cache_req *rqstp); -extern void cache_flush(void); -extern void cache_purge(struct cache_detail *detail); -#define NEVER (0x7FFFFFFF) -extern void __init cache_initialize(void); -extern int cache_register_net(struct cache_detail *cd, struct net *net); -extern void cache_unregister_net(struct cache_detail *cd, struct net *net); - -extern struct cache_detail *cache_create_net(struct cache_detail *tmpl, struct net *net); -extern void cache_destroy_net(struct cache_detail *cd, struct net *net); - -extern void sunrpc_init_cache_detail(struct cache_detail *cd); -extern void sunrpc_destroy_cache_detail(struct cache_detail *cd); -extern int sunrpc_cache_register_pipefs(struct dentry *parent, const char *, - umode_t, struct cache_detail *); -extern void sunrpc_cache_unregister_pipefs(struct cache_detail *); - -extern void qword_add(char **bpp, int *lp, char *str); -extern void qword_addhex(char **bpp, int *lp, char *buf, int blen); -extern int qword_get(char **bpp, char *dest, int bufsize); - -static inline int get_int(char **bpp, int *anint) -{ - char buf[50]; - char *ep; - int rv; - int len = qword_get(bpp, buf, 50); - if (len < 0) return -EINVAL; - if (len ==0) return -ENOENT; - rv = simple_strtol(buf, &ep, 0); - if (*ep) return -EINVAL; - *anint = rv; - return 0; -} - -/* - * timestamps kept in the cache are expressed in seconds - * since boot. This is the best for measuring differences in - * real time. - */ -static inline time_t seconds_since_boot(void) -{ - struct timespec boot; - getboottime(&boot); - return get_seconds() - boot.tv_sec; -} - -static inline time_t convert_to_wallclock(time_t sinceboot) -{ - struct timespec boot; - getboottime(&boot); - return boot.tv_sec + sinceboot; -} - -static inline time_t get_expiry(char **bpp) -{ - int rv; - struct timespec boot; - - if (get_int(bpp, &rv)) - return 0; - if (rv < 0) - return 0; - getboottime(&boot); - return rv - boot.tv_sec; -} - -#endif /* _LINUX_SUNRPC_CACHE_H_ */ |