author | Florian Westphal <fw@strlen.de> |
Sun, 11 Jan 2009 20:20:11 +0100 | |
changeset 0 | aa628870c1d3 |
permissions | -rw-r--r-- |
0
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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/* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* include/linux/sunrpc/cache.h |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Generic code for various authentication-related caches |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* used by sunrpc clients and servers. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Copyright (C) 2002 Neil Brown <neilb@cse.unsw.edu.au> |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Released under terms in GPL version 2. See COPYING. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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*/ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
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Port of Linux 2.6.28 for use with network simulation cradle.
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#ifndef _LINUX_SUNRPC_CACHE_H_ |
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#define _LINUX_SUNRPC_CACHE_H_ |
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|
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#include <linux/slab.h> |
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#include <asm/atomic.h> |
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#include <linux/proc_fs.h> |
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|
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Port of Linux 2.6.28 for use with network simulation cradle.
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/* |
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* Each cache requires: |
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* - A 'struct cache_detail' which contains information specific to the cache |
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* for common code to use. |
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* - An item structure that must contain a "struct cache_head" |
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* - A lookup function defined using DefineCacheLookup |
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* - A 'put' function that can release a cache item. It will only |
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* be called after cache_put has succeed, so there are guarantee |
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* to be no references. |
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* - A function to calculate a hash of an item's key. |
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* |
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* as well as assorted code fragments (e.g. compare keys) and numbers |
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* (e.g. hash size, goal_age, etc). |
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* |
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* Each cache must be registered so that it can be cleaned regularly. |
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* When the cache is unregistered, it is flushed completely. |
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* |
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* Entries have a ref count and a 'hashed' flag which counts the existance |
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* in the hash table. |
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* We only expire entries when refcount is zero. |
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* Existance in the cache is counted the refcount. |
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*/ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
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/* Every cache item has a common header that is used |
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* for expiring and refreshing entries. |
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* |
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*/ |
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struct cache_head { |
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struct cache_head * next; |
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time_t expiry_time; /* After time time, don't use the data */ |
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time_t last_refresh; /* If CACHE_PENDING, this is when upcall |
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* was sent, else this is when update was received |
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*/ |
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struct kref ref; |
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unsigned long flags; |
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}; |
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#define CACHE_VALID 0 /* Entry contains valid data */ |
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#define CACHE_NEGATIVE 1 /* Negative entry - there is no match for the key */ |
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#define CACHE_PENDING 2 /* An upcall has been sent but no reply received yet*/ |
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|
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#define CACHE_NEW_EXPIRY 120 /* keep new things pending confirmation for 120 seconds */ |
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|
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struct cache_detail { |
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struct module * owner; |
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int hash_size; |
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struct cache_head ** hash_table; |
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rwlock_t hash_lock; |
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|
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atomic_t inuse; /* active user-space update or lookup */ |
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|
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char *name; |
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void (*cache_put)(struct kref *); |
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void (*cache_request)(struct cache_detail *cd, |
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struct cache_head *h, |
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char **bpp, int *blen); |
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int (*cache_parse)(struct cache_detail *, |
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char *buf, int len); |
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|
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int (*cache_show)(struct seq_file *m, |
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struct cache_detail *cd, |
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struct cache_head *h); |
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|
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struct cache_head * (*alloc)(void); |
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int (*match)(struct cache_head *orig, struct cache_head *new); |
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void (*init)(struct cache_head *orig, struct cache_head *new); |
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void (*update)(struct cache_head *orig, struct cache_head *new); |
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|
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/* fields below this comment are for internal use |
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* and should not be touched by cache owners |
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*/ |
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time_t flush_time; /* flush all cache items with last_refresh |
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* earlier than this */ |
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struct list_head others; |
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time_t nextcheck; |
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int entries; |
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/* fields for communication over channel */ |
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struct list_head queue; |
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struct proc_dir_entry *proc_ent; |
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struct proc_dir_entry *flush_ent, *channel_ent, *content_ent; |
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|
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atomic_t readers; /* how many time is /chennel open */ |
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time_t last_close; /* if no readers, when did last close */ |
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time_t last_warn; /* when we last warned about no readers */ |
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void (*warn_no_listener)(struct cache_detail *cd); |
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}; |
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/* this must be embedded in any request structure that |
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* identifies an object that will want a callback on |
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* a cache fill |
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*/ |
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struct cache_req { |
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struct cache_deferred_req *(*defer)(struct cache_req *req); |
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115 |
}; |
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116 |
/* this must be embedded in a deferred_request that is being |
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117 |
* delayed awaiting cache-fill |
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118 |
*/ |
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119 |
struct cache_deferred_req { |
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120 |
struct list_head hash; /* on hash chain */ |
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121 |
struct list_head recent; /* on fifo */ |
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122 |
struct cache_head *item; /* cache item we wait on */ |
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123 |
void *owner; /* we might need to discard all defered requests |
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124 |
* owned by someone */ |
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125 |
void (*revisit)(struct cache_deferred_req *req, |
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126 |
int too_many); |
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127 |
}; |
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128 |
|
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129 |
|
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130 |
extern struct cache_head * |
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131 |
sunrpc_cache_lookup(struct cache_detail *detail, |
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132 |
struct cache_head *key, int hash); |
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133 |
extern struct cache_head * |
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134 |
sunrpc_cache_update(struct cache_detail *detail, |
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135 |
struct cache_head *new, struct cache_head *old, int hash); |
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136 |
|
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137 |
|
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138 |
extern void cache_clean_deferred(void *owner); |
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139 |
|
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140 |
static inline struct cache_head *cache_get(struct cache_head *h) |
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141 |
{ |
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142 |
kref_get(&h->ref); |
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143 |
return h; |
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144 |
} |
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145 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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146 |
|
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147 |
static inline void cache_put(struct cache_head *h, struct cache_detail *cd) |
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148 |
{ |
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149 |
if (atomic_read(&h->ref.refcount) <= 2 && |
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Port of Linux 2.6.28 for use with network simulation cradle.
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150 |
h->expiry_time < cd->nextcheck) |
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151 |
cd->nextcheck = h->expiry_time; |
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152 |
kref_put(&h->ref, cd->cache_put); |
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153 |
} |
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154 |
|
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155 |
static inline int cache_valid(struct cache_head *h) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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156 |
{ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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157 |
/* If an item has been unhashed pending removal when |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
158 |
* the refcount drops to 0, the expiry_time will be |
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|
159 |
* set to 0. We don't want to consider such items |
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Port of Linux 2.6.28 for use with network simulation cradle.
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160 |
* valid in this context even though CACHE_VALID is |
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Port of Linux 2.6.28 for use with network simulation cradle.
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161 |
* set. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
162 |
*/ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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163 |
return (h->expiry_time != 0 && test_bit(CACHE_VALID, &h->flags)); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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164 |
} |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
165 |
|
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166 |
extern int cache_check(struct cache_detail *detail, |
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Port of Linux 2.6.28 for use with network simulation cradle.
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167 |
struct cache_head *h, struct cache_req *rqstp); |
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168 |
extern void cache_flush(void); |
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169 |
extern void cache_purge(struct cache_detail *detail); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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170 |
#define NEVER (0x7FFFFFFF) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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171 |
extern int cache_register(struct cache_detail *cd); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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172 |
extern void cache_unregister(struct cache_detail *cd); |
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173 |
|
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174 |
extern void qword_add(char **bpp, int *lp, char *str); |
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175 |
extern void qword_addhex(char **bpp, int *lp, char *buf, int blen); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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176 |
extern int qword_get(char **bpp, char *dest, int bufsize); |
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177 |
|
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|
178 |
static inline int get_int(char **bpp, int *anint) |
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179 |
{ |
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180 |
char buf[50]; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
181 |
char *ep; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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182 |
int rv; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
183 |
int len = qword_get(bpp, buf, 50); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
184 |
if (len < 0) return -EINVAL; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
185 |
if (len ==0) return -ENOENT; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
186 |
rv = simple_strtol(buf, &ep, 0); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
187 |
if (*ep) return -EINVAL; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
188 |
*anint = rv; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
189 |
return 0; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
190 |
} |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
191 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
192 |
static inline time_t get_expiry(char **bpp) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
193 |
{ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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changeset
|
194 |
int rv; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
195 |
if (get_int(bpp, &rv)) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
196 |
return 0; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
197 |
if (rv < 0) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
198 |
return 0; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
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|
199 |
return rv; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
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|
200 |
} |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
201 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
202 |
#endif /* _LINUX_SUNRPC_CACHE_H_ */ |