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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | ||
4 | #include "rgw_cache.h" | |
5 | ||
6 | #include <errno.h> | |
7 | ||
8 | #define dout_subsys ceph_subsys_rgw | |
9 | ||
10 | using namespace std; | |
11 | ||
12 | int ObjectCache::get(string& name, ObjectCacheInfo& info, uint32_t mask, rgw_cache_entry_info *cache_info) | |
13 | { | |
14 | RWLock::RLocker l(lock); | |
15 | ||
16 | if (!enabled) { | |
17 | return -ENOENT; | |
18 | } | |
19 | ||
20 | map<string, ObjectCacheEntry>::iterator iter = cache_map.find(name); | |
21 | if (iter == cache_map.end()) { | |
22 | ldout(cct, 10) << "cache get: name=" << name << " : miss" << dendl; | |
23 | if(perfcounter) perfcounter->inc(l_rgw_cache_miss); | |
24 | return -ENOENT; | |
25 | } | |
26 | ||
27 | ObjectCacheEntry *entry = &iter->second; | |
28 | ||
29 | if (lru_counter - entry->lru_promotion_ts > lru_window) { | |
30 | ldout(cct, 20) << "cache get: touching lru, lru_counter=" << lru_counter | |
31 | << " promotion_ts=" << entry->lru_promotion_ts << dendl; | |
32 | lock.unlock(); | |
33 | lock.get_write(); /* promote lock to writer */ | |
34 | ||
35 | /* need to redo this because entry might have dropped off the cache */ | |
36 | iter = cache_map.find(name); | |
37 | if (iter == cache_map.end()) { | |
38 | ldout(cct, 10) << "lost race! cache get: name=" << name << " : miss" << dendl; | |
39 | if(perfcounter) perfcounter->inc(l_rgw_cache_miss); | |
40 | return -ENOENT; | |
41 | } | |
42 | ||
43 | entry = &iter->second; | |
44 | /* check again, we might have lost a race here */ | |
45 | if (lru_counter - entry->lru_promotion_ts > lru_window) { | |
46 | touch_lru(name, *entry, iter->second.lru_iter); | |
47 | } | |
48 | } | |
49 | ||
50 | ObjectCacheInfo& src = iter->second.info; | |
51 | if ((src.flags & mask) != mask) { | |
52 | ldout(cct, 10) << "cache get: name=" << name << " : type miss (requested=0x" | |
53 | << std::hex << mask << ", cached=0x" << src.flags | |
54 | << std::dec << ")" << dendl; | |
55 | if(perfcounter) perfcounter->inc(l_rgw_cache_miss); | |
56 | return -ENOENT; | |
57 | } | |
58 | ldout(cct, 10) << "cache get: name=" << name << " : hit (requested=0x" | |
59 | << std::hex << mask << ", cached=0x" << src.flags | |
60 | << std::dec << ")" << dendl; | |
61 | ||
62 | info = src; | |
63 | if (cache_info) { | |
64 | cache_info->cache_locator = name; | |
65 | cache_info->gen = entry->gen; | |
66 | } | |
67 | if(perfcounter) perfcounter->inc(l_rgw_cache_hit); | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | bool ObjectCache::chain_cache_entry(list<rgw_cache_entry_info *>& cache_info_entries, RGWChainedCache::Entry *chained_entry) | |
73 | { | |
74 | RWLock::WLocker l(lock); | |
75 | ||
76 | if (!enabled) { | |
77 | return false; | |
78 | } | |
79 | ||
80 | list<rgw_cache_entry_info *>::iterator citer; | |
81 | ||
82 | list<ObjectCacheEntry *> cache_entry_list; | |
83 | ||
84 | /* first verify that all entries are still valid */ | |
85 | for (citer = cache_info_entries.begin(); citer != cache_info_entries.end(); ++citer) { | |
86 | rgw_cache_entry_info *cache_info = *citer; | |
87 | ||
88 | ldout(cct, 10) << "chain_cache_entry: cache_locator=" << cache_info->cache_locator << dendl; | |
89 | map<string, ObjectCacheEntry>::iterator iter = cache_map.find(cache_info->cache_locator); | |
90 | if (iter == cache_map.end()) { | |
91 | ldout(cct, 20) << "chain_cache_entry: couldn't find cache locator" << dendl; | |
92 | return false; | |
93 | } | |
94 | ||
95 | ObjectCacheEntry *entry = &iter->second; | |
96 | ||
97 | if (entry->gen != cache_info->gen) { | |
98 | ldout(cct, 20) << "chain_cache_entry: entry.gen (" << entry->gen << ") != cache_info.gen (" << cache_info->gen << ")" << dendl; | |
99 | return false; | |
100 | } | |
101 | ||
102 | cache_entry_list.push_back(entry); | |
103 | } | |
104 | ||
105 | ||
106 | chained_entry->cache->chain_cb(chained_entry->key, chained_entry->data); | |
107 | ||
108 | list<ObjectCacheEntry *>::iterator liter; | |
109 | ||
110 | for (liter = cache_entry_list.begin(); liter != cache_entry_list.end(); ++liter) { | |
111 | ObjectCacheEntry *entry = *liter; | |
112 | ||
113 | entry->chained_entries.push_back(make_pair(chained_entry->cache, chained_entry->key)); | |
114 | } | |
115 | ||
116 | return true; | |
117 | } | |
118 | ||
119 | void ObjectCache::put(string& name, ObjectCacheInfo& info, rgw_cache_entry_info *cache_info) | |
120 | { | |
121 | RWLock::WLocker l(lock); | |
122 | ||
123 | if (!enabled) { | |
124 | return; | |
125 | } | |
126 | ||
127 | ldout(cct, 10) << "cache put: name=" << name << " info.flags=0x" | |
128 | << std::hex << info.flags << std::dec << dendl; | |
129 | map<string, ObjectCacheEntry>::iterator iter = cache_map.find(name); | |
130 | if (iter == cache_map.end()) { | |
131 | ObjectCacheEntry entry; | |
132 | entry.lru_iter = lru.end(); | |
133 | cache_map.insert(pair<string, ObjectCacheEntry>(name, entry)); | |
134 | iter = cache_map.find(name); | |
135 | } | |
136 | ObjectCacheEntry& entry = iter->second; | |
137 | ObjectCacheInfo& target = entry.info; | |
138 | ||
139 | for (list<pair<RGWChainedCache *, string> >::iterator iiter = entry.chained_entries.begin(); | |
140 | iiter != entry.chained_entries.end(); ++iiter) { | |
141 | RGWChainedCache *chained_cache = iiter->first; | |
142 | chained_cache->invalidate(iiter->second); | |
143 | } | |
144 | ||
145 | entry.chained_entries.clear(); | |
146 | entry.gen++; | |
147 | ||
148 | touch_lru(name, entry, entry.lru_iter); | |
149 | ||
150 | target.status = info.status; | |
151 | ||
152 | if (info.status < 0) { | |
153 | target.flags = 0; | |
154 | target.xattrs.clear(); | |
155 | target.data.clear(); | |
156 | return; | |
157 | } | |
158 | ||
159 | if (cache_info) { | |
160 | cache_info->cache_locator = name; | |
161 | cache_info->gen = entry.gen; | |
162 | } | |
163 | ||
164 | target.flags |= info.flags; | |
165 | ||
166 | if (info.flags & CACHE_FLAG_META) | |
167 | target.meta = info.meta; | |
168 | else if (!(info.flags & CACHE_FLAG_MODIFY_XATTRS)) | |
169 | target.flags &= ~CACHE_FLAG_META; // non-meta change should reset meta | |
170 | ||
171 | if (info.flags & CACHE_FLAG_XATTRS) { | |
172 | target.xattrs = info.xattrs; | |
173 | map<string, bufferlist>::iterator iter; | |
174 | for (iter = target.xattrs.begin(); iter != target.xattrs.end(); ++iter) { | |
175 | ldout(cct, 10) << "updating xattr: name=" << iter->first << " bl.length()=" << iter->second.length() << dendl; | |
176 | } | |
177 | } else if (info.flags & CACHE_FLAG_MODIFY_XATTRS) { | |
178 | map<string, bufferlist>::iterator iter; | |
179 | for (iter = info.rm_xattrs.begin(); iter != info.rm_xattrs.end(); ++iter) { | |
180 | ldout(cct, 10) << "removing xattr: name=" << iter->first << dendl; | |
181 | target.xattrs.erase(iter->first); | |
182 | } | |
183 | for (iter = info.xattrs.begin(); iter != info.xattrs.end(); ++iter) { | |
184 | ldout(cct, 10) << "appending xattr: name=" << iter->first << " bl.length()=" << iter->second.length() << dendl; | |
185 | target.xattrs[iter->first] = iter->second; | |
186 | } | |
187 | } | |
188 | ||
189 | if (info.flags & CACHE_FLAG_DATA) | |
190 | target.data = info.data; | |
191 | ||
192 | if (info.flags & CACHE_FLAG_OBJV) | |
193 | target.version = info.version; | |
194 | } | |
195 | ||
196 | void ObjectCache::remove(string& name) | |
197 | { | |
198 | RWLock::WLocker l(lock); | |
199 | ||
200 | if (!enabled) { | |
201 | return; | |
202 | } | |
203 | ||
204 | map<string, ObjectCacheEntry>::iterator iter = cache_map.find(name); | |
205 | if (iter == cache_map.end()) | |
206 | return; | |
207 | ||
208 | ldout(cct, 10) << "removing " << name << " from cache" << dendl; | |
209 | ObjectCacheEntry& entry = iter->second; | |
210 | ||
211 | for (list<pair<RGWChainedCache *, string> >::iterator iiter = entry.chained_entries.begin(); | |
212 | iiter != entry.chained_entries.end(); ++iiter) { | |
213 | RGWChainedCache *chained_cache = iiter->first; | |
214 | chained_cache->invalidate(iiter->second); | |
215 | } | |
216 | ||
217 | remove_lru(name, iter->second.lru_iter); | |
218 | cache_map.erase(iter); | |
219 | } | |
220 | ||
221 | void ObjectCache::touch_lru(string& name, ObjectCacheEntry& entry, std::list<string>::iterator& lru_iter) | |
222 | { | |
223 | while (lru_size > (size_t)cct->_conf->rgw_cache_lru_size) { | |
224 | list<string>::iterator iter = lru.begin(); | |
225 | if ((*iter).compare(name) == 0) { | |
226 | /* | |
227 | * if the entry we're touching happens to be at the lru end, don't remove it, | |
228 | * lru shrinking can wait for next time | |
229 | */ | |
230 | break; | |
231 | } | |
232 | map<string, ObjectCacheEntry>::iterator map_iter = cache_map.find(*iter); | |
233 | ldout(cct, 10) << "removing entry: name=" << *iter << " from cache LRU" << dendl; | |
234 | if (map_iter != cache_map.end()) | |
235 | cache_map.erase(map_iter); | |
236 | lru.pop_front(); | |
237 | lru_size--; | |
238 | } | |
239 | ||
240 | if (lru_iter == lru.end()) { | |
241 | lru.push_back(name); | |
242 | lru_size++; | |
243 | lru_iter--; | |
244 | ldout(cct, 10) << "adding " << name << " to cache LRU end" << dendl; | |
245 | } else { | |
246 | ldout(cct, 10) << "moving " << name << " to cache LRU end" << dendl; | |
247 | lru.erase(lru_iter); | |
248 | lru.push_back(name); | |
249 | lru_iter = lru.end(); | |
250 | --lru_iter; | |
251 | } | |
252 | ||
253 | lru_counter++; | |
254 | entry.lru_promotion_ts = lru_counter; | |
255 | } | |
256 | ||
257 | void ObjectCache::remove_lru(string& name, std::list<string>::iterator& lru_iter) | |
258 | { | |
259 | if (lru_iter == lru.end()) | |
260 | return; | |
261 | ||
262 | lru.erase(lru_iter); | |
263 | lru_size--; | |
264 | lru_iter = lru.end(); | |
265 | } | |
266 | ||
267 | void ObjectCache::set_enabled(bool status) | |
268 | { | |
269 | RWLock::WLocker l(lock); | |
270 | ||
271 | enabled = status; | |
272 | ||
273 | if (!enabled) { | |
274 | do_invalidate_all(); | |
275 | } | |
276 | } | |
277 | ||
278 | void ObjectCache::invalidate_all() | |
279 | { | |
280 | RWLock::WLocker l(lock); | |
281 | ||
282 | do_invalidate_all(); | |
283 | } | |
284 | ||
285 | void ObjectCache::do_invalidate_all() | |
286 | { | |
287 | cache_map.clear(); | |
288 | lru.clear(); | |
289 | ||
290 | lru_size = 0; | |
291 | lru_counter = 0; | |
292 | lru_window = 0; | |
293 | ||
294 | for (list<RGWChainedCache *>::iterator iter = chained_cache.begin(); iter != chained_cache.end(); ++iter) { | |
295 | (*iter)->invalidate_all(); | |
296 | } | |
297 | } | |
298 | ||
299 | void ObjectCache::chain_cache(RGWChainedCache *cache) { | |
300 | RWLock::WLocker l(lock); | |
301 | chained_cache.push_back(cache); | |
302 | } | |
303 |