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