The C++-like 'template' approach proves to be too ugly and hard
to work with.
The old 'template' won't go away until all users are updated.
Signed-off-by: Neil Brown <[email protected]>
### Diffstat output
./include/linux/sunrpc/cache.h | 12 +++++
./net/sunrpc/cache.c | 98 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 110 insertions(+)
diff ./include/linux/sunrpc/cache.h~current~ ./include/linux/sunrpc/cache.h
--- ./include/linux/sunrpc/cache.h~current~ 2006-03-09 17:15:13.000000000 +1100
+++ ./include/linux/sunrpc/cache.h 2006-03-09 17:15:14.000000000 +1100
@@ -81,6 +81,11 @@ struct cache_detail {
struct cache_detail *cd,
struct cache_head *h);
+ 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
*/
@@ -237,6 +242,13 @@ RTN *FNAME ARGS \
& FUNC##_cache, FUNC##_hash(item), FUNC##_match(item, tmp), \
STRUCT##_init(new, item), STRUCT##_update(tmp, item))
+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);
+
#define cache_for_each(pos, detail, index, member) \
for (({read_lock(&(detail)->hash_lock); index = (detail)->hash_size;}) ; \
diff ./net/sunrpc/cache.c~current~ ./net/sunrpc/cache.c
--- ./net/sunrpc/cache.c~current~ 2006-03-09 17:12:58.000000000 +1100
+++ ./net/sunrpc/cache.c 2006-03-09 17:15:14.000000000 +1100
@@ -47,6 +47,104 @@ void cache_init(struct cache_head *h)
h->last_refresh = now;
}
+struct cache_head *sunrpc_cache_lookup(struct cache_detail *detail,
+ struct cache_head *key, int hash)
+{
+ struct cache_head **head, **hp;
+ struct cache_head *new = NULL;
+
+ head = &detail->hash_table[hash];
+
+ read_lock(&detail->hash_lock);
+
+ for (hp=head; *hp != NULL ; hp = &(*hp)->next) {
+ struct cache_head *tmp = *hp;
+ if (detail->match(tmp, key)) {
+ cache_get(tmp);
+ read_unlock(&detail->hash_lock);
+ return tmp;
+ }
+ }
+ read_unlock(&detail->hash_lock);
+ /* Didn't find anything, insert an empty entry */
+
+ new = detail->alloc();
+ if (!new)
+ return NULL;
+ cache_init(new);
+
+ write_lock(&detail->hash_lock);
+
+ /* check if entry appeared while we slept */
+ for (hp=head; *hp != NULL ; hp = &(*hp)->next) {
+ struct cache_head *tmp = *hp;
+ if (detail->match(tmp, key)) {
+ cache_get(tmp);
+ write_unlock(&detail->hash_lock);
+ detail->cache_put(new, detail);
+ return tmp;
+ }
+ }
+ detail->init(new, key);
+ new->next = *head;
+ *head = new;
+ detail->entries++;
+ cache_get(new);
+ write_unlock(&detail->hash_lock);
+
+ return new;
+}
+EXPORT_SYMBOL(sunrpc_cache_lookup);
+
+struct cache_head *sunrpc_cache_update(struct cache_detail *detail,
+ struct cache_head *new, struct cache_head *old, int hash)
+{
+ /* The 'old' entry is to be replaced by 'new'.
+ * If 'old' is not VALID, we update it directly,
+ * otherwise we need to replace it
+ */
+ struct cache_head **head;
+ struct cache_head *tmp;
+
+ if (!test_bit(CACHE_VALID, &old->flags)) {
+ write_lock(&detail->hash_lock);
+ if (!test_bit(CACHE_VALID, &old->flags)) {
+ if (test_bit(CACHE_NEGATIVE, &new->flags))
+ set_bit(CACHE_NEGATIVE, &old->flags);
+ else
+ detail->update(old, new);
+ /* FIXME cache_fresh should come first */
+ write_unlock(&detail->hash_lock);
+ cache_fresh(detail, old, new->expiry_time);
+ return old;
+ }
+ write_unlock(&detail->hash_lock);
+ }
+ /* We need to insert a new entry */
+ tmp = detail->alloc();
+ if (!tmp) {
+ detail->cache_put(old, detail);
+ return NULL;
+ }
+ cache_init(tmp);
+ detail->init(tmp, old);
+ head = &detail->hash_table[hash];
+
+ write_lock(&detail->hash_lock);
+ if (test_bit(CACHE_NEGATIVE, &new->flags))
+ set_bit(CACHE_NEGATIVE, &tmp->flags);
+ else
+ detail->update(tmp, new);
+ tmp->next = *head;
+ *head = tmp;
+ cache_get(tmp);
+ write_unlock(&detail->hash_lock);
+ cache_fresh(detail, tmp, new->expiry_time);
+ cache_fresh(detail, old, 0);
+ detail->cache_put(old, detail);
+ return tmp;
+}
+EXPORT_SYMBOL(sunrpc_cache_update);
static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h);
/*
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
