+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-
-#include "rgw_cache.h"
-
-#include <errno.h>
-
-#define dout_subsys ceph_subsys_rgw
-
-using namespace std;
-
-int ObjectCache::get(string& name, ObjectCacheInfo& info, uint32_t mask, rgw_cache_entry_info *cache_info)
-{
- RWLock::RLocker l(lock);
-
- if (!enabled) {
- return -ENOENT;
- }
-
- 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;
- }
-
- ObjectCacheEntry *entry = &iter->second;
-
- if (lru_counter - entry->lru_promotion_ts > lru_window) {
- ldout(cct, 20) << "cache get: touching lru, lru_counter=" << lru_counter
- << " promotion_ts=" << entry->lru_promotion_ts << dendl;
- lock.unlock();
- lock.get_write(); /* promote lock to writer */
-
- /* need to redo this because entry might have dropped off the cache */
- iter = cache_map.find(name);
- if (iter == cache_map.end()) {
- ldout(cct, 10) << "lost race! cache get: name=" << name << " : miss" << dendl;
- if(perfcounter) perfcounter->inc(l_rgw_cache_miss);
- return -ENOENT;
- }
-
- entry = &iter->second;
- /* check again, we might have lost a race here */
- if (lru_counter - entry->lru_promotion_ts > lru_window) {
- touch_lru(name, *entry, iter->second.lru_iter);
- }
- }
-
- ObjectCacheInfo& src = iter->second.info;
- if ((src.flags & mask) != mask) {
- ldout(cct, 10) << "cache get: name=" << name << " : type miss (requested=0x"
- << std::hex << mask << ", cached=0x" << src.flags
- << std::dec << ")" << dendl;
- if(perfcounter) perfcounter->inc(l_rgw_cache_miss);
- return -ENOENT;
- }
- ldout(cct, 10) << "cache get: name=" << name << " : hit (requested=0x"
- << std::hex << mask << ", cached=0x" << src.flags
- << std::dec << ")" << dendl;
-
- info = src;
- if (cache_info) {
- cache_info->cache_locator = name;
- cache_info->gen = entry->gen;
- }
- if(perfcounter) perfcounter->inc(l_rgw_cache_hit);
-
- return 0;
-}
-
-bool ObjectCache::chain_cache_entry(list<rgw_cache_entry_info *>& cache_info_entries, RGWChainedCache::Entry *chained_entry)
-{
- RWLock::WLocker l(lock);
-
- if (!enabled) {
- return false;
- }
-
- list<rgw_cache_entry_info *>::iterator citer;
-
- list<ObjectCacheEntry *> cache_entry_list;
-
- /* first verify that all entries are still valid */
- for (citer = cache_info_entries.begin(); citer != cache_info_entries.end(); ++citer) {
- rgw_cache_entry_info *cache_info = *citer;
-
- ldout(cct, 10) << "chain_cache_entry: cache_locator=" << cache_info->cache_locator << dendl;
- map<string, ObjectCacheEntry>::iterator iter = cache_map.find(cache_info->cache_locator);
- if (iter == cache_map.end()) {
- ldout(cct, 20) << "chain_cache_entry: couldn't find cache locator" << dendl;
- return false;
- }
-
- ObjectCacheEntry *entry = &iter->second;
-
- if (entry->gen != cache_info->gen) {
- ldout(cct, 20) << "chain_cache_entry: entry.gen (" << entry->gen << ") != cache_info.gen (" << cache_info->gen << ")" << dendl;
- return false;
- }
-
- cache_entry_list.push_back(entry);
- }
-
-
- chained_entry->cache->chain_cb(chained_entry->key, chained_entry->data);
-
- list<ObjectCacheEntry *>::iterator liter;
-
- for (liter = cache_entry_list.begin(); liter != cache_entry_list.end(); ++liter) {
- ObjectCacheEntry *entry = *liter;
-
- entry->chained_entries.push_back(make_pair(chained_entry->cache, chained_entry->key));
- }
-
- return true;
-}
-
-void ObjectCache::put(string& name, ObjectCacheInfo& info, rgw_cache_entry_info *cache_info)
-{
- RWLock::WLocker l(lock);
-
- if (!enabled) {
- return;
- }
-
- ldout(cct, 10) << "cache put: name=" << name << " info.flags=0x"
- << std::hex << info.flags << std::dec << 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;
-
- for (list<pair<RGWChainedCache *, string> >::iterator iiter = entry.chained_entries.begin();
- iiter != entry.chained_entries.end(); ++iiter) {
- RGWChainedCache *chained_cache = iiter->first;
- chained_cache->invalidate(iiter->second);
- }
-
- entry.chained_entries.clear();
- entry.gen++;
-
- touch_lru(name, entry, entry.lru_iter);
-
- target.status = info.status;
-
- if (info.status < 0) {
- target.flags = 0;
- target.xattrs.clear();
- target.data.clear();
- return;
- }
-
- if (cache_info) {
- cache_info->cache_locator = name;
- cache_info->gen = entry.gen;
- }
-
- 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;
-
- if (info.flags & CACHE_FLAG_OBJV)
- target.version = info.version;
-}
-
-void ObjectCache::remove(string& name)
-{
- RWLock::WLocker l(lock);
-
- if (!enabled) {
- return;
- }
-
- map<string, ObjectCacheEntry>::iterator iter = cache_map.find(name);
- if (iter == cache_map.end())
- return;
-
- ldout(cct, 10) << "removing " << name << " from cache" << dendl;
- ObjectCacheEntry& entry = iter->second;
-
- for (list<pair<RGWChainedCache *, string> >::iterator iiter = entry.chained_entries.begin();
- iiter != entry.chained_entries.end(); ++iiter) {
- RGWChainedCache *chained_cache = iiter->first;
- chained_cache->invalidate(iiter->second);
- }
-
- remove_lru(name, iter->second.lru_iter);
- cache_map.erase(iter);
-}
-
-void ObjectCache::touch_lru(string& name, ObjectCacheEntry& entry, 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();
- lru_size--;
- }
-
- if (lru_iter == lru.end()) {
- lru.push_back(name);
- lru_size++;
- 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;
- }
-
- lru_counter++;
- entry.lru_promotion_ts = lru_counter;
-}
-
-void ObjectCache::remove_lru(string& name, std::list<string>::iterator& lru_iter)
-{
- if (lru_iter == lru.end())
- return;
-
- lru.erase(lru_iter);
- lru_size--;
- lru_iter = lru.end();
-}
-
-void ObjectCache::set_enabled(bool status)
-{
- RWLock::WLocker l(lock);
-
- enabled = status;
-
- if (!enabled) {
- do_invalidate_all();
- }
-}
-
-void ObjectCache::invalidate_all()
-{
- RWLock::WLocker l(lock);
-
- do_invalidate_all();
-}
-
-void ObjectCache::do_invalidate_all()
-{
- cache_map.clear();
- lru.clear();
-
- lru_size = 0;
- lru_counter = 0;
- lru_window = 0;
-
- for (list<RGWChainedCache *>::iterator iter = chained_cache.begin(); iter != chained_cache.end(); ++iter) {
- (*iter)->invalidate_all();
- }
-}
-
-void ObjectCache::chain_cache(RGWChainedCache *cache) {
- RWLock::WLocker l(lock);
- chained_cache.push_back(cache);
-}
-
Code Review / stor4nfv.git / blobdiff