/**
* Based on the timestamp, determine the proper token keys to use limiting
* to the first ``count'' items.
*
* @return NULL if we cannot locate any suitable keys.
*/
static const struct tokkey *
find_tokkey_upto(time_t now, size_t count)
{
time_t adjusted = now - VERSION_ANCIENT_BAN;
uint i;
if (GNET_PROPERTY(version_debug) > 4) {
g_debug("%s: count=%zu, from %s()",
G_STRFUNC, count, stacktrace_caller_name(1));
}
g_assert(count <= G_N_ELEMENTS(token_keys));
for (i = 0; i < count; i++) {
const struct tokkey *tk = &token_keys[i];
if (GNET_PROPERTY(version_debug) > 4) {
g_debug("%s: index=%u, ver.timestamp=%u, adjusted=%u (%s)",
G_STRFUNC, i, (unsigned) tk->ver.timestamp, (unsigned) adjusted,
tk->ver.timestamp > adjusted ? "OK" :
i + 1 == count ? "FAILED" : "no");
}
if (tk->ver.timestamp > adjusted)
return tk;
}
return NULL;
}
/**
* Invalidate possibly cached page.
*
* This is used when we know a new and fresh copy of the page is held on
* the disk. Further access to the page will require reloading the
* page from disk.
*/
void
lru_invalidate(DBM *db, long bno)
{
struct lru_cache *cache = db->cache;
void *value;
if (
g_hash_table_lookup_extended(cache->pagnum,
ulong_to_pointer(bno), NULL, &value)
) {
long idx = pointer_to_int(value);
g_assert(idx >= 0 && idx < cache->pages);
g_assert(cache->numpag[idx] == bno);
/*
* One should never be invalidating a dirty page, unless something
* went wrong during a split and we're trying to undo things.
* Since the operation will cause a data loss, warn.
*/
if (cache->dirty[idx]) {
g_warning("sdbm: \"%s\": %s() invalidating dirty page #%ld",
db->name, stacktrace_caller_name(1), bno);
}
hash_list_remove(cache->used, value);
g_hash_table_remove(cache->pagnum, ulong_to_pointer(bno));
cache->numpag[idx] = -1;
cache->dirty[idx] = FALSE;
slist_append(cache->available, value); /* Make index available */
}
}
