--- /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