--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "rgw_gc.h"
+#include "include/rados/librados.hpp"
+#include "cls/rgw/cls_rgw_client.h"
+#include "cls/refcount/cls_refcount_client.h"
+#include "cls/lock/cls_lock_client.h"
+#include "auth/Crypto.h"
+
+#include <list>
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rgw
+
+using namespace std;
+using namespace librados;
+
+static string gc_oid_prefix = "gc";
+static string gc_index_lock_name = "gc_process";
+
+
+void RGWGC::initialize(CephContext *_cct, RGWRados *_store) {
+ cct = _cct;
+ store = _store;
+
+ max_objs = min(static_cast<int>(cct->_conf->rgw_gc_max_objs), rgw_shards_max());
+
+ obj_names = new string[max_objs];
+
+ for (int i = 0; i < max_objs; i++) {
+ obj_names[i] = gc_oid_prefix;
+ char buf[32];
+ snprintf(buf, 32, ".%d", i);
+ obj_names[i].append(buf);
+ }
+}
+
+void RGWGC::finalize()
+{
+ delete[] obj_names;
+}
+
+int RGWGC::tag_index(const string& tag)
+{
+ return rgw_shards_hash(tag, max_objs);
+}
+
+void RGWGC::add_chain(ObjectWriteOperation& op, cls_rgw_obj_chain& chain, const string& tag)
+{
+ cls_rgw_gc_obj_info info;
+ info.chain = chain;
+ info.tag = tag;
+
+ cls_rgw_gc_set_entry(op, cct->_conf->rgw_gc_obj_min_wait, info);
+}
+
+int RGWGC::send_chain(cls_rgw_obj_chain& chain, const string& tag, bool sync)
+{
+ ObjectWriteOperation op;
+ add_chain(op, chain, tag);
+
+ int i = tag_index(tag);
+
+ if (sync)
+ return store->gc_operate(obj_names[i], &op);
+
+ return store->gc_aio_operate(obj_names[i], &op);
+}
+
+int RGWGC::defer_chain(const string& tag, bool sync)
+{
+ ObjectWriteOperation op;
+ cls_rgw_gc_defer_entry(op, cct->_conf->rgw_gc_obj_min_wait, tag);
+
+ int i = tag_index(tag);
+
+ if (sync)
+ return store->gc_operate(obj_names[i], &op);
+
+ return store->gc_aio_operate(obj_names[i], &op);
+}
+
+int RGWGC::remove(int index, const std::list<string>& tags)
+{
+ ObjectWriteOperation op;
+ cls_rgw_gc_remove(op, tags);
+ return store->gc_operate(obj_names[index], &op);
+}
+
+int RGWGC::list(int *index, string& marker, uint32_t max, bool expired_only, std::list<cls_rgw_gc_obj_info>& result, bool *truncated)
+{
+ result.clear();
+ string next_marker;
+
+ for (; *index < max_objs && result.size() < max; (*index)++, marker.clear()) {
+ std::list<cls_rgw_gc_obj_info> entries;
+ int ret = cls_rgw_gc_list(store->gc_pool_ctx, obj_names[*index], marker, max - result.size(), expired_only, entries, truncated, next_marker);
+ if (ret == -ENOENT)
+ continue;
+ if (ret < 0)
+ return ret;
+
+ std::list<cls_rgw_gc_obj_info>::iterator iter;
+ for (iter = entries.begin(); iter != entries.end(); ++iter) {
+ result.push_back(*iter);
+ }
+
+ marker = next_marker;
+
+ if (*index == max_objs - 1) {
+ /* we cut short here, truncated will hold the correct value */
+ return 0;
+ }
+
+ if (result.size() == max) {
+ /* close approximation, it might be that the next of the objects don't hold
+ * anything, in this case truncated should have been false, but we can find
+ * that out on the next iteration
+ */
+ *truncated = true;
+ return 0;
+ }
+
+ }
+ *truncated = false;
+
+ return 0;
+}
+
+int RGWGC::process(int index, int max_secs)
+{
+ rados::cls::lock::Lock l(gc_index_lock_name);
+ utime_t end = ceph_clock_now();
+ std::list<string> remove_tags;
+
+ /* max_secs should be greater than zero. We don't want a zero max_secs
+ * to be translated as no timeout, since we'd then need to break the
+ * lock and that would require a manual intervention. In this case
+ * we can just wait it out. */
+ if (max_secs <= 0)
+ return -EAGAIN;
+
+ end += max_secs;
+ utime_t time(max_secs, 0);
+ l.set_duration(time);
+
+ int ret = l.lock_exclusive(&store->gc_pool_ctx, obj_names[index]);
+ if (ret == -EBUSY) { /* already locked by another gc processor */
+ dout(10) << "RGWGC::process() failed to acquire lock on " << obj_names[index] << dendl;
+ return 0;
+ }
+ if (ret < 0)
+ return ret;
+
+ string marker;
+ string next_marker;
+ bool truncated;
+ IoCtx *ctx = new IoCtx;
+ do {
+ int max = 100;
+ std::list<cls_rgw_gc_obj_info> entries;
+ ret = cls_rgw_gc_list(store->gc_pool_ctx, obj_names[index], marker, max, true, entries, &truncated, next_marker);
+ if (ret == -ENOENT) {
+ ret = 0;
+ goto done;
+ }
+ if (ret < 0)
+ goto done;
+
+ string last_pool;
+ std::list<cls_rgw_gc_obj_info>::iterator iter;
+ for (iter = entries.begin(); iter != entries.end(); ++iter) {
+ bool remove_tag;
+ cls_rgw_gc_obj_info& info = *iter;
+ std::list<cls_rgw_obj>::iterator liter;
+ cls_rgw_obj_chain& chain = info.chain;
+
+ utime_t now = ceph_clock_now();
+ if (now >= end)
+ goto done;
+
+ remove_tag = true;
+ for (liter = chain.objs.begin(); liter != chain.objs.end(); ++liter) {
+ cls_rgw_obj& obj = *liter;
+
+ if (obj.pool != last_pool) {
+ delete ctx;
+ ctx = new IoCtx;
+ ret = rgw_init_ioctx(store->get_rados_handle(), obj.pool, *ctx);
+ if (ret < 0) {
+ dout(0) << "ERROR: failed to create ioctx pool=" << obj.pool << dendl;
+ continue;
+ }
+ last_pool = obj.pool;
+ }
+
+ ctx->locator_set_key(obj.loc);
+
+ const string& oid = obj.key.name; /* just stored raw oid there */
+
+ dout(5) << "gc::process: removing " << obj.pool << ":" << obj.key.name << dendl;
+ ObjectWriteOperation op;
+ cls_refcount_put(op, info.tag, true);
+ ret = ctx->operate(oid, &op);
+ if (ret == -ENOENT)
+ ret = 0;
+ if (ret < 0) {
+ remove_tag = false;
+ dout(0) << "failed to remove " << obj.pool << ":" << oid << "@" << obj.loc << dendl;
+ }
+
+ if (going_down()) // leave early, even if tag isn't removed, it's ok
+ goto done;
+ }
+ if (remove_tag) {
+ remove_tags.push_back(info.tag);
+#define MAX_REMOVE_CHUNK 16
+ if (remove_tags.size() > MAX_REMOVE_CHUNK) {
+ RGWGC::remove(index, remove_tags);
+ remove_tags.clear();
+ }
+ }
+ }
+ if (!remove_tags.empty()) {
+ RGWGC::remove(index, remove_tags);
+ remove_tags.clear();
+ }
+ } while (truncated);
+
+done:
+ if (!remove_tags.empty())
+ RGWGC::remove(index, remove_tags);
+ l.unlock(&store->gc_pool_ctx, obj_names[index]);
+ delete ctx;
+ return 0;
+}
+
+int RGWGC::process()
+{
+ int max_secs = cct->_conf->rgw_gc_processor_max_time;
+
+ unsigned start;
+ int ret = get_random_bytes((char *)&start, sizeof(start));
+ if (ret < 0)
+ return ret;
+
+ for (int i = 0; i < max_objs; i++) {
+ int index = (i + start) % max_objs;
+ ret = process(index, max_secs);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+bool RGWGC::going_down()
+{
+ return down_flag;
+}
+
+void RGWGC::start_processor()
+{
+ worker = new GCWorker(cct, this);
+ worker->create("rgw_gc");
+}
+
+void RGWGC::stop_processor()
+{
+ down_flag = true;
+ if (worker) {
+ worker->stop();
+ worker->join();
+ }
+ delete worker;
+ worker = NULL;
+}
+
+void *RGWGC::GCWorker::entry() {
+ do {
+ utime_t start = ceph_clock_now();
+ dout(2) << "garbage collection: start" << dendl;
+ int r = gc->process();
+ if (r < 0) {
+ dout(0) << "ERROR: garbage collection process() returned error r=" << r << dendl;
+ }
+ dout(2) << "garbage collection: stop" << dendl;
+
+ if (gc->going_down())
+ break;
+
+ utime_t end = ceph_clock_now();
+ end -= start;
+ int secs = cct->_conf->rgw_gc_processor_period;
+
+ if (secs <= end.sec())
+ continue; // next round
+
+ secs -= end.sec();
+
+ lock.Lock();
+ cond.WaitInterval(lock, utime_t(secs, 0));
+ lock.Unlock();
+ } while (!gc->going_down());
+
+ return NULL;
+}
+
+void RGWGC::GCWorker::stop()
+{
+ Mutex::Locker l(lock);
+ cond.Signal();
+}
+
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