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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 18:24:20 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 18:24:20 +0000 |
commit | 483eb2f56657e8e7f419ab1a4fab8dce9ade8609 (patch) | |
tree | e5d88d25d870d5dedacb6bbdbe2a966086a0a5cf /src/librbd/ConfigWatcher.cc | |
parent | Initial commit. (diff) | |
download | ceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.tar.xz ceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.zip |
Adding upstream version 14.2.21.upstream/14.2.21upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/librbd/ConfigWatcher.cc')
-rw-r--r-- | src/librbd/ConfigWatcher.cc | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/src/librbd/ConfigWatcher.cc b/src/librbd/ConfigWatcher.cc new file mode 100644 index 00000000..f8f17016 --- /dev/null +++ b/src/librbd/ConfigWatcher.cc @@ -0,0 +1,116 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +#include "librbd/ConfigWatcher.h" +#include "common/config_obs.h" +#include "common/dout.h" +#include "common/errno.h" +#include "librbd/ImageCtx.h" +#include "librbd/ImageState.h" +#include "librbd/api/Config.h" +#include <deque> +#include <string> +#include <vector> +#include <boost/algorithm/string/predicate.hpp> + +#define dout_subsys ceph_subsys_rbd +#undef dout_prefix +#define dout_prefix *_dout << "librbd::ConfigWatcher: " \ + << __func__ << ": " + +namespace librbd { + +template <typename I> +struct ConfigWatcher<I>::Observer : public md_config_obs_t { + ConfigWatcher<I>* m_config_watcher; + + std::deque<std::string> m_config_key_strs; + mutable std::vector<const char*> m_config_keys; + + Observer(CephContext* cct, ConfigWatcher<I>* config_watcher) + : m_config_watcher(config_watcher) { + const std::string rbd_key_prefix("rbd_"); + auto& schema = cct->_conf.get_schema(); + for (auto& pair : schema) { + // watch all "rbd_" keys for simplicity + if (!boost::starts_with(pair.first, rbd_key_prefix)) { + continue; + } + + m_config_key_strs.emplace_back(pair.first); + } + + m_config_keys.reserve(m_config_key_strs.size()); + for (auto& key : m_config_key_strs) { + m_config_keys.emplace_back(key.c_str()); + } + m_config_keys.emplace_back(nullptr); + } + + const char** get_tracked_conf_keys() const override { + ceph_assert(!m_config_keys.empty()); + return &m_config_keys[0]; + } + + void handle_conf_change(const ConfigProxy& conf, + const std::set <std::string> &changed) override { + m_config_watcher->handle_global_config_change(changed); + } +}; + +template <typename I> +ConfigWatcher<I>::ConfigWatcher(I& image_ctx) + : m_image_ctx(image_ctx) { +} + +template <typename I> +ConfigWatcher<I>::~ConfigWatcher() { + ceph_assert(m_observer == nullptr); +} + +template <typename I> +void ConfigWatcher<I>::init() { + auto cct = m_image_ctx.cct; + ldout(cct, 10) << dendl; + + m_observer = new Observer(cct, this); + cct->_conf.add_observer(m_observer); +} + +template <typename I> +void ConfigWatcher<I>::shut_down() { + auto cct = m_image_ctx.cct; + ldout(cct, 10) << dendl; + + ceph_assert(m_observer != nullptr); + cct->_conf.remove_observer(m_observer); + + delete m_observer; + m_observer = nullptr; +} + +template <typename I> +void ConfigWatcher<I>::handle_global_config_change( + std::set<std::string> changed_keys) { + + { + // ignore any global changes that are being overridden + RWLock::RLocker md_locker(m_image_ctx.md_lock); + for (auto& key : m_image_ctx.config_overrides) { + changed_keys.erase(key); + } + } + if (changed_keys.empty()) { + return; + } + + auto cct = m_image_ctx.cct; + ldout(cct, 10) << "changed_keys=" << changed_keys << dendl; + + // refresh the image to pick up any global config overrides + m_image_ctx.state->handle_update_notification(); +} + +} // namespace librbd + +template class librbd::ConfigWatcher<librbd::ImageCtx>; |