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7c673cae | 1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
9f95a23c | 2 | // vim: ts=8 sw=2 smarttab ft=cpp |
7c673cae FG |
3 | |
4 | #include "rgw_cache.h" | |
11fdf7f2 | 5 | #include "rgw_perf_counters.h" |
7c673cae FG |
6 | |
7 | #include <errno.h> | |
8 | ||
9 | #define dout_subsys ceph_subsys_rgw | |
10 | ||
7c673cae | 11 | |
3a9019d9 | 12 | int ObjectCache::get(const string& name, ObjectCacheInfo& info, uint32_t mask, rgw_cache_entry_info *cache_info) |
7c673cae | 13 | { |
7c673cae | 14 | |
9f95a23c | 15 | std::shared_lock rl{lock}; |
7c673cae FG |
16 | if (!enabled) { |
17 | return -ENOENT; | |
18 | } | |
b32b8144 | 19 | auto iter = cache_map.find(name); |
1adf2230 | 20 | if (iter == cache_map.end()) { |
7c673cae | 21 | ldout(cct, 10) << "cache get: name=" << name << " : miss" << dendl; |
9f95a23c | 22 | if (perfcounter) { |
b32b8144 | 23 | perfcounter->inc(l_rgw_cache_miss); |
9f95a23c | 24 | } |
7c673cae FG |
25 | return -ENOENT; |
26 | } | |
9f95a23c | 27 | |
1adf2230 AA |
28 | if (expiry.count() && |
29 | (ceph::coarse_mono_clock::now() - iter->second.info.time_added) > expiry) { | |
30 | ldout(cct, 10) << "cache get: name=" << name << " : expiry miss" << dendl; | |
9f95a23c TL |
31 | rl.unlock(); |
32 | std::unique_lock wl{lock}; // write lock for insertion | |
1adf2230 AA |
33 | // check that wasn't already removed by other thread |
34 | iter = cache_map.find(name); | |
35 | if (iter != cache_map.end()) { | |
36 | for (auto &kv : iter->second.chained_entries) | |
37 | kv.first->invalidate(kv.second); | |
38 | remove_lru(name, iter->second.lru_iter); | |
39 | cache_map.erase(iter); | |
40 | } | |
9f95a23c | 41 | if (perfcounter) { |
1adf2230 | 42 | perfcounter->inc(l_rgw_cache_miss); |
9f95a23c | 43 | } |
1adf2230 AA |
44 | return -ENOENT; |
45 | } | |
7c673cae FG |
46 | |
47 | ObjectCacheEntry *entry = &iter->second; | |
48 | ||
49 | if (lru_counter - entry->lru_promotion_ts > lru_window) { | |
50 | ldout(cct, 20) << "cache get: touching lru, lru_counter=" << lru_counter | |
51 | << " promotion_ts=" << entry->lru_promotion_ts << dendl; | |
9f95a23c TL |
52 | rl.unlock(); |
53 | std::unique_lock wl{lock}; // write lock for insertion | |
7c673cae FG |
54 | /* need to redo this because entry might have dropped off the cache */ |
55 | iter = cache_map.find(name); | |
56 | if (iter == cache_map.end()) { | |
57 | ldout(cct, 10) << "lost race! cache get: name=" << name << " : miss" << dendl; | |
58 | if(perfcounter) perfcounter->inc(l_rgw_cache_miss); | |
59 | return -ENOENT; | |
60 | } | |
61 | ||
62 | entry = &iter->second; | |
63 | /* check again, we might have lost a race here */ | |
64 | if (lru_counter - entry->lru_promotion_ts > lru_window) { | |
65 | touch_lru(name, *entry, iter->second.lru_iter); | |
66 | } | |
67 | } | |
68 | ||
69 | ObjectCacheInfo& src = iter->second.info; | |
70 | if ((src.flags & mask) != mask) { | |
71 | ldout(cct, 10) << "cache get: name=" << name << " : type miss (requested=0x" | |
72 | << std::hex << mask << ", cached=0x" << src.flags | |
73 | << std::dec << ")" << dendl; | |
74 | if(perfcounter) perfcounter->inc(l_rgw_cache_miss); | |
75 | return -ENOENT; | |
76 | } | |
77 | ldout(cct, 10) << "cache get: name=" << name << " : hit (requested=0x" | |
78 | << std::hex << mask << ", cached=0x" << src.flags | |
79 | << std::dec << ")" << dendl; | |
80 | ||
81 | info = src; | |
82 | if (cache_info) { | |
83 | cache_info->cache_locator = name; | |
84 | cache_info->gen = entry->gen; | |
85 | } | |
86 | if(perfcounter) perfcounter->inc(l_rgw_cache_hit); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
11fdf7f2 TL |
91 | bool ObjectCache::chain_cache_entry(std::initializer_list<rgw_cache_entry_info*> cache_info_entries, |
92 | RGWChainedCache::Entry *chained_entry) | |
7c673cae | 93 | { |
9f95a23c | 94 | std::unique_lock l{lock}; |
7c673cae FG |
95 | |
96 | if (!enabled) { | |
97 | return false; | |
98 | } | |
99 | ||
11fdf7f2 TL |
100 | std::vector<ObjectCacheEntry*> entries; |
101 | entries.reserve(cache_info_entries.size()); | |
7c673cae | 102 | /* first verify that all entries are still valid */ |
11fdf7f2 TL |
103 | for (auto cache_info : cache_info_entries) { |
104 | ldout(cct, 10) << "chain_cache_entry: cache_locator=" | |
105 | << cache_info->cache_locator << dendl; | |
106 | auto iter = cache_map.find(cache_info->cache_locator); | |
7c673cae FG |
107 | if (iter == cache_map.end()) { |
108 | ldout(cct, 20) << "chain_cache_entry: couldn't find cache locator" << dendl; | |
109 | return false; | |
110 | } | |
111 | ||
11fdf7f2 | 112 | auto entry = &iter->second; |
7c673cae FG |
113 | |
114 | if (entry->gen != cache_info->gen) { | |
11fdf7f2 TL |
115 | ldout(cct, 20) << "chain_cache_entry: entry.gen (" << entry->gen |
116 | << ") != cache_info.gen (" << cache_info->gen << ")" | |
117 | << dendl; | |
7c673cae FG |
118 | return false; |
119 | } | |
11fdf7f2 | 120 | entries.push_back(entry); |
7c673cae FG |
121 | } |
122 | ||
123 | ||
124 | chained_entry->cache->chain_cb(chained_entry->key, chained_entry->data); | |
125 | ||
11fdf7f2 TL |
126 | for (auto entry : entries) { |
127 | entry->chained_entries.push_back(make_pair(chained_entry->cache, | |
128 | chained_entry->key)); | |
7c673cae FG |
129 | } |
130 | ||
131 | return true; | |
132 | } | |
133 | ||
3a9019d9 | 134 | void ObjectCache::put(const string& name, ObjectCacheInfo& info, rgw_cache_entry_info *cache_info) |
7c673cae | 135 | { |
9f95a23c | 136 | std::unique_lock l{lock}; |
7c673cae FG |
137 | |
138 | if (!enabled) { | |
139 | return; | |
140 | } | |
141 | ||
142 | ldout(cct, 10) << "cache put: name=" << name << " info.flags=0x" | |
143 | << std::hex << info.flags << std::dec << dendl; | |
28e407b8 | 144 | |
11fdf7f2 TL |
145 | auto [iter, inserted] = cache_map.emplace(name, ObjectCacheEntry{}); |
146 | ObjectCacheEntry& entry = iter->second; | |
28e407b8 AA |
147 | entry.info.time_added = ceph::coarse_mono_clock::now(); |
148 | if (inserted) { | |
7c673cae | 149 | entry.lru_iter = lru.end(); |
7c673cae | 150 | } |
7c673cae FG |
151 | ObjectCacheInfo& target = entry.info; |
152 | ||
b32b8144 | 153 | invalidate_lru(entry); |
7c673cae FG |
154 | |
155 | entry.chained_entries.clear(); | |
156 | entry.gen++; | |
157 | ||
158 | touch_lru(name, entry, entry.lru_iter); | |
159 | ||
160 | target.status = info.status; | |
161 | ||
162 | if (info.status < 0) { | |
163 | target.flags = 0; | |
164 | target.xattrs.clear(); | |
165 | target.data.clear(); | |
166 | return; | |
167 | } | |
168 | ||
169 | if (cache_info) { | |
170 | cache_info->cache_locator = name; | |
171 | cache_info->gen = entry.gen; | |
172 | } | |
173 | ||
174 | target.flags |= info.flags; | |
175 | ||
176 | if (info.flags & CACHE_FLAG_META) | |
177 | target.meta = info.meta; | |
178 | else if (!(info.flags & CACHE_FLAG_MODIFY_XATTRS)) | |
179 | target.flags &= ~CACHE_FLAG_META; // non-meta change should reset meta | |
180 | ||
181 | if (info.flags & CACHE_FLAG_XATTRS) { | |
182 | target.xattrs = info.xattrs; | |
183 | map<string, bufferlist>::iterator iter; | |
184 | for (iter = target.xattrs.begin(); iter != target.xattrs.end(); ++iter) { | |
185 | ldout(cct, 10) << "updating xattr: name=" << iter->first << " bl.length()=" << iter->second.length() << dendl; | |
186 | } | |
187 | } else if (info.flags & CACHE_FLAG_MODIFY_XATTRS) { | |
188 | map<string, bufferlist>::iterator iter; | |
189 | for (iter = info.rm_xattrs.begin(); iter != info.rm_xattrs.end(); ++iter) { | |
190 | ldout(cct, 10) << "removing xattr: name=" << iter->first << dendl; | |
191 | target.xattrs.erase(iter->first); | |
192 | } | |
193 | for (iter = info.xattrs.begin(); iter != info.xattrs.end(); ++iter) { | |
194 | ldout(cct, 10) << "appending xattr: name=" << iter->first << " bl.length()=" << iter->second.length() << dendl; | |
195 | target.xattrs[iter->first] = iter->second; | |
196 | } | |
197 | } | |
198 | ||
199 | if (info.flags & CACHE_FLAG_DATA) | |
200 | target.data = info.data; | |
201 | ||
202 | if (info.flags & CACHE_FLAG_OBJV) | |
203 | target.version = info.version; | |
204 | } | |
205 | ||
3a9019d9 | 206 | bool ObjectCache::remove(const string& name) |
7c673cae | 207 | { |
9f95a23c | 208 | std::unique_lock l{lock}; |
7c673cae FG |
209 | |
210 | if (!enabled) { | |
3a9019d9 | 211 | return false; |
7c673cae FG |
212 | } |
213 | ||
11fdf7f2 | 214 | auto iter = cache_map.find(name); |
7c673cae | 215 | if (iter == cache_map.end()) |
3a9019d9 | 216 | return false; |
7c673cae FG |
217 | |
218 | ldout(cct, 10) << "removing " << name << " from cache" << dendl; | |
219 | ObjectCacheEntry& entry = iter->second; | |
220 | ||
11fdf7f2 TL |
221 | for (auto& kv : entry.chained_entries) { |
222 | kv.first->invalidate(kv.second); | |
7c673cae FG |
223 | } |
224 | ||
225 | remove_lru(name, iter->second.lru_iter); | |
226 | cache_map.erase(iter); | |
3a9019d9 | 227 | return true; |
7c673cae FG |
228 | } |
229 | ||
3a9019d9 FG |
230 | void ObjectCache::touch_lru(const string& name, ObjectCacheEntry& entry, |
231 | std::list<string>::iterator& lru_iter) | |
7c673cae FG |
232 | { |
233 | while (lru_size > (size_t)cct->_conf->rgw_cache_lru_size) { | |
11fdf7f2 | 234 | auto iter = lru.begin(); |
7c673cae FG |
235 | if ((*iter).compare(name) == 0) { |
236 | /* | |
237 | * if the entry we're touching happens to be at the lru end, don't remove it, | |
238 | * lru shrinking can wait for next time | |
239 | */ | |
240 | break; | |
241 | } | |
11fdf7f2 | 242 | auto map_iter = cache_map.find(*iter); |
7c673cae | 243 | ldout(cct, 10) << "removing entry: name=" << *iter << " from cache LRU" << dendl; |
b32b8144 FG |
244 | if (map_iter != cache_map.end()) { |
245 | ObjectCacheEntry& entry = map_iter->second; | |
246 | invalidate_lru(entry); | |
7c673cae | 247 | cache_map.erase(map_iter); |
b32b8144 | 248 | } |
7c673cae FG |
249 | lru.pop_front(); |
250 | lru_size--; | |
251 | } | |
252 | ||
253 | if (lru_iter == lru.end()) { | |
254 | lru.push_back(name); | |
255 | lru_size++; | |
256 | lru_iter--; | |
257 | ldout(cct, 10) << "adding " << name << " to cache LRU end" << dendl; | |
258 | } else { | |
259 | ldout(cct, 10) << "moving " << name << " to cache LRU end" << dendl; | |
260 | lru.erase(lru_iter); | |
261 | lru.push_back(name); | |
262 | lru_iter = lru.end(); | |
263 | --lru_iter; | |
264 | } | |
265 | ||
266 | lru_counter++; | |
267 | entry.lru_promotion_ts = lru_counter; | |
268 | } | |
269 | ||
3a9019d9 FG |
270 | void ObjectCache::remove_lru(const string& name, |
271 | std::list<string>::iterator& lru_iter) | |
7c673cae FG |
272 | { |
273 | if (lru_iter == lru.end()) | |
274 | return; | |
275 | ||
276 | lru.erase(lru_iter); | |
277 | lru_size--; | |
278 | lru_iter = lru.end(); | |
279 | } | |
280 | ||
b32b8144 FG |
281 | void ObjectCache::invalidate_lru(ObjectCacheEntry& entry) |
282 | { | |
11fdf7f2 | 283 | for (auto iter = entry.chained_entries.begin(); |
b32b8144 FG |
284 | iter != entry.chained_entries.end(); ++iter) { |
285 | RGWChainedCache *chained_cache = iter->first; | |
286 | chained_cache->invalidate(iter->second); | |
287 | } | |
288 | } | |
289 | ||
7c673cae FG |
290 | void ObjectCache::set_enabled(bool status) |
291 | { | |
9f95a23c | 292 | std::unique_lock l{lock}; |
7c673cae FG |
293 | |
294 | enabled = status; | |
295 | ||
296 | if (!enabled) { | |
297 | do_invalidate_all(); | |
298 | } | |
299 | } | |
300 | ||
301 | void ObjectCache::invalidate_all() | |
302 | { | |
9f95a23c | 303 | std::unique_lock l{lock}; |
7c673cae FG |
304 | |
305 | do_invalidate_all(); | |
306 | } | |
307 | ||
308 | void ObjectCache::do_invalidate_all() | |
309 | { | |
310 | cache_map.clear(); | |
311 | lru.clear(); | |
312 | ||
313 | lru_size = 0; | |
314 | lru_counter = 0; | |
315 | lru_window = 0; | |
316 | ||
11fdf7f2 TL |
317 | for (auto& cache : chained_cache) { |
318 | cache->invalidate_all(); | |
7c673cae FG |
319 | } |
320 | } | |
321 | ||
322 | void ObjectCache::chain_cache(RGWChainedCache *cache) { | |
9f95a23c | 323 | std::unique_lock l{lock}; |
7c673cae FG |
324 | chained_cache.push_back(cache); |
325 | } | |
326 | ||
11fdf7f2 | 327 | void ObjectCache::unchain_cache(RGWChainedCache *cache) { |
9f95a23c | 328 | std::unique_lock l{lock}; |
11fdf7f2 TL |
329 | |
330 | auto iter = chained_cache.begin(); | |
331 | for (; iter != chained_cache.end(); ++iter) { | |
332 | if (cache == *iter) { | |
333 | chained_cache.erase(iter); | |
334 | cache->unregistered(); | |
335 | return; | |
336 | } | |
337 | } | |
338 | } | |
339 | ||
340 | ObjectCache::~ObjectCache() | |
341 | { | |
342 | for (auto cache : chained_cache) { | |
343 | cache->unregistered(); | |
344 | } | |
345 | } | |
346 |