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#include <errno.h>
#include "common/debug.h"
#include "rgw_cache.h"
using namespace std;
#define dout_subsys ceph_subsys_rgw
int ObjectCache::get(string& name, ObjectCacheInfo& info, uint32_t mask)
{
Mutex::Locker l(lock);
map<string, ObjectCacheEntry>::iterator iter = cache_map.find(name);
if (iter == cache_map.end()) {
ldout(cct, 10) << "cache get: name=" << name << " : miss" << dendl;
if(perfcounter) perfcounter->inc(l_rgw_cache_miss);
return -ENOENT;
}
touch_lru(name, iter->second.lru_iter);
ObjectCacheInfo& src = iter->second.info;
if ((src.flags & mask) != mask) {
ldout(cct, 10) << "cache get: name=" << name << " : type miss (requested=" << mask << ", cached=" << src.flags << ")" << dendl;
if(perfcounter) perfcounter->inc(l_rgw_cache_miss);
return -ENOENT;
}
ldout(cct, 10) << "cache get: name=" << name << " : hit" << dendl;
info = src;
if(perfcounter) perfcounter->inc(l_rgw_cache_hit);
return 0;
}
void ObjectCache::put(string& name, ObjectCacheInfo& info)
{
Mutex::Locker l(lock);
ldout(cct, 10) << "cache put: name=" << name << dendl;
map<string, ObjectCacheEntry>::iterator iter = cache_map.find(name);
if (iter == cache_map.end()) {
ObjectCacheEntry entry;
entry.lru_iter = lru.end();
cache_map.insert(pair<string, ObjectCacheEntry>(name, entry));
iter = cache_map.find(name);
}
ObjectCacheEntry& entry = iter->second;
ObjectCacheInfo& target = entry.info;
touch_lru(name, entry.lru_iter);
target.status = info.status;
if (info.status < 0) {
target.flags = 0;
target.xattrs.clear();
target.data.clear();
return;
}
target.flags |= info.flags;
if (info.flags & CACHE_FLAG_META)
target.meta = info.meta;
else if (!(info.flags & CACHE_FLAG_MODIFY_XATTRS))
target.flags &= ~CACHE_FLAG_META; // non-meta change should reset meta
if (info.flags & CACHE_FLAG_XATTRS) {
target.xattrs = info.xattrs;
map<string, bufferlist>::iterator iter;
for (iter = target.xattrs.begin(); iter != target.xattrs.end(); ++iter) {
ldout(cct, 10) << "updating xattr: name=" << iter->first << " bl.length()=" << iter->second.length() << dendl;
}
} else if (info.flags & CACHE_FLAG_MODIFY_XATTRS) {
map<string, bufferlist>::iterator iter;
for (iter = info.rm_xattrs.begin(); iter != info.rm_xattrs.end(); ++iter) {
ldout(cct, 10) << "removing xattr: name=" << iter->first << dendl;
target.xattrs.erase(iter->first);
}
for (iter = info.xattrs.begin(); iter != info.xattrs.end(); ++iter) {
ldout(cct, 10) << "appending xattr: name=" << iter->first << " bl.length()=" << iter->second.length() << dendl;
target.xattrs[iter->first] = iter->second;
}
}
if (info.flags & CACHE_FLAG_DATA)
target.data = info.data;
}
void ObjectCache::remove(string& name)
{
Mutex::Locker l(lock);
map<string, ObjectCacheEntry>::iterator iter = cache_map.find(name);
if (iter == cache_map.end())
return;
ldout(cct, 10) << "removing " << name << " from cache" << dendl;
remove_lru(name, iter->second.lru_iter);
cache_map.erase(iter);
}
void ObjectCache::touch_lru(string& name, std::list<string>::iterator& lru_iter)
{
while (lru.size() > (size_t)cct->_conf->rgw_cache_lru_size) {
list<string>::iterator iter = lru.begin();
if ((*iter).compare(name) == 0) {
/*
* if the entry we're touching happens to be at the lru end, don't remove it,
* lru shrinking can wait for next time
*/
break;
}
map<string, ObjectCacheEntry>::iterator map_iter = cache_map.find(*iter);
ldout(cct, 10) << "removing entry: name=" << *iter << " from cache LRU" << dendl;
if (map_iter != cache_map.end())
cache_map.erase(map_iter);
lru.pop_front();
}
if (lru_iter == lru.end()) {
lru.push_back(name);
lru_iter--;
ldout(cct, 10) << "adding " << name << " to cache LRU end" << dendl;
} else {
ldout(cct, 10) << "moving " << name << " to cache LRU end" << dendl;
lru.erase(lru_iter);
lru.push_back(name);
lru_iter = lru.end();
--lru_iter;
}
}
void ObjectCache::remove_lru(string& name, std::list<string>::iterator& lru_iter)
{
if (lru_iter == lru.end())
return;
lru.erase(lru_iter);
lru_iter = lru.end();
}
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