--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "librbd/operation/SnapshotUnprotectRequest.h"
+#include "include/rados/librados.hpp"
+#include "include/stringify.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "librbd/AsyncObjectThrottle.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/internal.h"
+#include "librbd/Types.h"
+#include "librbd/Utils.h"
+#include <list>
+#include <set>
+#include <vector>
+#include <boost/lambda/bind.hpp>
+#include <boost/lambda/construct.hpp>
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::SnapshotUnprotectRequest: "
+
+namespace librbd {
+namespace operation {
+
+namespace {
+
+typedef std::pair<int64_t, std::string> Pool;
+typedef std::vector<Pool> Pools;
+
+template <typename I>
+std::ostream& operator<<(std::ostream& os,
+ const typename SnapshotUnprotectRequest<I>::State& state) {
+ switch(state) {
+ case SnapshotUnprotectRequest<I>::STATE_UNPROTECT_SNAP_START:
+ os << "UNPROTECT_SNAP_START";
+ break;
+ case SnapshotUnprotectRequest<I>::STATE_SCAN_POOL_CHILDREN:
+ os << "SCAN_POOL_CHILDREN";
+ break;
+ case SnapshotUnprotectRequest<I>::STATE_UNPROTECT_SNAP_FINISH:
+ os << "UNPROTECT_SNAP_FINISH";
+ break;
+ case SnapshotUnprotectRequest<I>::STATE_UNPROTECT_SNAP_ROLLBACK:
+ os << "UNPROTECT_SNAP_ROLLBACK";
+ break;
+ default:
+ os << "UNKNOWN (" << static_cast<uint32_t>(state) << ")";
+ break;
+ }
+ return os;
+}
+
+template <typename I>
+class C_ScanPoolChildren : public C_AsyncObjectThrottle<I> {
+public:
+ C_ScanPoolChildren(AsyncObjectThrottle<I> &throttle, I *image_ctx,
+ const ParentSpec &pspec, const Pools &pools,
+ size_t pool_idx)
+ : C_AsyncObjectThrottle<I>(throttle, *image_ctx), m_pspec(pspec),
+ m_pool(pools[pool_idx]) {
+ }
+
+ int send() override {
+ I &image_ctx = this->m_image_ctx;
+ assert(image_ctx.owner_lock.is_locked());
+
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 10) << this << " scanning pool '" << m_pool.second << "'"
+ << dendl;
+
+ librados::Rados rados(image_ctx.md_ctx);
+ int64_t base_tier;
+ int r = rados.pool_get_base_tier(m_pool.first, &base_tier);
+ if (r == -ENOENT) {
+ ldout(cct, 1) << "pool '" << m_pool.second << "' no longer exists"
+ << dendl;
+ return 1;
+ } else if (r < 0) {
+ lderr(cct) << "error retrieving base tier for pool '"
+ << m_pool.second << "'" << dendl;
+ return r;
+ }
+ if (m_pool.first != base_tier) {
+ // pool is a cache; skip it
+ return 1;
+ }
+
+ r = rados.ioctx_create2(m_pool.first, m_pool_ioctx);
+ if (r == -ENOENT) {
+ ldout(cct, 1) << "pool '" << m_pool.second << "' no longer exists"
+ << dendl;
+ return 1;
+ } else if (r < 0) {
+ lderr(cct) << "can't create ioctx for pool '" << m_pool.second
+ << "'" << dendl;
+ return r;
+ }
+
+ librados::ObjectReadOperation op;
+ cls_client::get_children_start(&op, m_pspec);
+
+ librados::AioCompletion *rados_completion =
+ util::create_rados_callback(this);
+ r = m_pool_ioctx.aio_operate(RBD_CHILDREN, rados_completion, &op,
+ &m_children_bl);
+ assert(r == 0);
+ rados_completion->release();
+ return 0;
+ }
+
+protected:
+ void finish(int r) override {
+ I &image_ctx = this->m_image_ctx;
+ CephContext *cct = image_ctx.cct;
+
+ if (r == 0) {
+ bufferlist::iterator it = m_children_bl.begin();
+ r= cls_client::get_children_finish(&it, &m_children);
+ }
+
+ ldout(cct, 10) << this << " retrieved children: r=" << r << dendl;
+ if (r == -ENOENT) {
+ // no children -- proceed with unprotect
+ r = 0;
+ } else if (r < 0) {
+ lderr(cct) << "cannot get children for pool '" << m_pool.second << "'"
+ << dendl;
+ } else {
+ lderr(cct) << "cannot unprotect: at least " << m_children.size() << " "
+ << "child(ren) [" << joinify(m_children.begin(),
+ m_children.end(),
+ std::string(",")) << "] "
+ << "in pool '" << m_pool.second << "'" << dendl;
+ r = -EBUSY;
+ }
+ C_AsyncObjectThrottle<I>::finish(r);
+ }
+
+private:
+ ParentSpec m_pspec;
+ Pool m_pool;
+
+ IoCtx m_pool_ioctx;
+ std::set<std::string> m_children;
+ bufferlist m_children_bl;
+};
+
+} // anonymous namespace
+
+template <typename I>
+SnapshotUnprotectRequest<I>::SnapshotUnprotectRequest(I &image_ctx,
+ Context *on_finish,
+ const cls::rbd::SnapshotNamespace &snap_namespace,
+ const std::string &snap_name)
+ : Request<I>(image_ctx, on_finish), m_snap_namespace(snap_namespace),
+ m_snap_name(snap_name), m_ret_val(0), m_snap_id(CEPH_NOSNAP) {
+}
+
+template <typename I>
+void SnapshotUnprotectRequest<I>::send_op() {
+ send_unprotect_snap_start();
+}
+
+template <typename I>
+bool SnapshotUnprotectRequest<I>::should_complete(int r) {
+ I &image_ctx = this->m_image_ctx;
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << ": state=" << m_state << ", "
+ << "r=" << r << dendl;
+ if (r < 0) {
+ if (r == -EINVAL) {
+ ldout(cct, 1) << "snapshot is already unprotected" << dendl;
+ } else {
+ lderr(cct) << "encountered error: " << cpp_strerror(r) << dendl;
+ }
+ if (m_ret_val == 0) {
+ m_ret_val = r;
+ }
+ }
+
+ // use a different state machine once an error is encountered
+ if (m_ret_val < 0) {
+ return should_complete_error();
+ }
+
+ RWLock::RLocker owner_lock(image_ctx.owner_lock);
+ bool finished = false;
+ switch (m_state) {
+ case STATE_UNPROTECT_SNAP_START:
+ send_scan_pool_children();
+ break;
+ case STATE_SCAN_POOL_CHILDREN:
+ send_unprotect_snap_finish();
+ break;
+ case STATE_UNPROTECT_SNAP_FINISH:
+ finished = true;
+ break;
+ default:
+ assert(false);
+ break;
+ }
+ return finished;
+}
+
+template <typename I>
+bool SnapshotUnprotectRequest<I>::should_complete_error() {
+ I &image_ctx = this->m_image_ctx;
+ RWLock::RLocker owner_locker(image_ctx.owner_lock);
+ CephContext *cct = image_ctx.cct;
+ lderr(cct) << this << " " << __func__ << ": "
+ << "ret_val=" << m_ret_val << dendl;
+
+ bool finished = true;
+ if (m_state == STATE_SCAN_POOL_CHILDREN ||
+ m_state == STATE_UNPROTECT_SNAP_FINISH) {
+ send_unprotect_snap_rollback();
+ finished = false;
+ }
+ return finished;
+}
+
+template <typename I>
+void SnapshotUnprotectRequest<I>::send_unprotect_snap_start() {
+ I &image_ctx = this->m_image_ctx;
+ assert(image_ctx.owner_lock.is_locked());
+
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << dendl;
+
+ m_state = STATE_UNPROTECT_SNAP_START;
+
+ int r = verify_and_send_unprotect_snap_start();
+ if (r < 0) {
+ this->async_complete(r);
+ return;
+ }
+}
+
+template <typename I>
+void SnapshotUnprotectRequest<I>::send_scan_pool_children() {
+ I &image_ctx = this->m_image_ctx;
+ assert(image_ctx.owner_lock.is_locked());
+
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << dendl;
+ m_state = STATE_SCAN_POOL_CHILDREN;
+
+ // search all pools for children depending on this snapshot
+ // TODO add async version of wait_for_latest_osdmap
+ librados::Rados rados(image_ctx.md_ctx);
+ rados.wait_for_latest_osdmap();
+
+ // protect against pools being renamed/deleted
+ std::list<Pool> pool_list;
+ rados.pool_list2(pool_list);
+
+ ParentSpec pspec(image_ctx.md_ctx.get_id(), image_ctx.id, m_snap_id);
+ Pools pools(pool_list.begin(), pool_list.end());
+
+ Context *ctx = this->create_callback_context();
+ typename AsyncObjectThrottle<I>::ContextFactory context_factory(
+ boost::lambda::bind(boost::lambda::new_ptr<C_ScanPoolChildren<I> >(),
+ boost::lambda::_1, &image_ctx, pspec, pools, boost::lambda::_2));
+ AsyncObjectThrottle<I> *throttle = new AsyncObjectThrottle<I>(
+ nullptr, image_ctx, context_factory, ctx, NULL, 0, pools.size());
+ throttle->start_ops(image_ctx.concurrent_management_ops);
+}
+
+template <typename I>
+void SnapshotUnprotectRequest<I>::send_unprotect_snap_finish() {
+ I &image_ctx = this->m_image_ctx;
+ assert(image_ctx.owner_lock.is_locked());
+
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << dendl;
+
+ m_state = STATE_UNPROTECT_SNAP_FINISH;
+
+ librados::ObjectWriteOperation op;
+ cls_client::set_protection_status(&op, m_snap_id,
+ RBD_PROTECTION_STATUS_UNPROTECTED);
+
+ librados::AioCompletion *comp = this->create_callback_completion();
+ int r = image_ctx.md_ctx.aio_operate(image_ctx.header_oid, comp, &op);
+ assert(r == 0);
+ comp->release();
+}
+
+template <typename I>
+void SnapshotUnprotectRequest<I>::send_unprotect_snap_rollback() {
+ I &image_ctx = this->m_image_ctx;
+ assert(image_ctx.owner_lock.is_locked());
+
+ CephContext *cct = image_ctx.cct;
+ ldout(cct, 5) << this << " " << __func__ << dendl;
+
+ m_state = STATE_UNPROTECT_SNAP_ROLLBACK;
+
+ librados::ObjectWriteOperation op;
+ cls_client::set_protection_status(&op, m_snap_id,
+ RBD_PROTECTION_STATUS_PROTECTED);
+
+ librados::AioCompletion *comp = this->create_callback_completion();
+ int r = image_ctx.md_ctx.aio_operate(image_ctx.header_oid, comp, &op);
+ assert(r == 0);
+ comp->release();
+}
+
+template <typename I>
+int SnapshotUnprotectRequest<I>::verify_and_send_unprotect_snap_start() {
+ I &image_ctx = this->m_image_ctx;
+ RWLock::RLocker md_locker(image_ctx.md_lock);
+ RWLock::RLocker snap_locker(image_ctx.snap_lock);
+
+ CephContext *cct = image_ctx.cct;
+ if ((image_ctx.features & RBD_FEATURE_LAYERING) == 0) {
+ lderr(cct) << "image must support layering" << dendl;
+ return -ENOSYS;
+ }
+
+ m_snap_id = image_ctx.get_snap_id(m_snap_namespace, m_snap_name);
+ if (m_snap_id == CEPH_NOSNAP) {
+ return -ENOENT;
+ }
+
+ bool is_unprotected;
+ int r = image_ctx.is_snap_unprotected(m_snap_id, &is_unprotected);
+ if (r < 0) {
+ return r;
+ }
+
+ if (is_unprotected) {
+ lderr(cct) << "snapshot is already unprotected" << dendl;
+ return -EINVAL;
+ }
+
+ librados::ObjectWriteOperation op;
+ cls_client::set_protection_status(&op, m_snap_id,
+ RBD_PROTECTION_STATUS_UNPROTECTING);
+
+ librados::AioCompletion *comp = this->create_callback_completion();
+ r = image_ctx.md_ctx.aio_operate(image_ctx.header_oid, comp, &op);
+ assert(r == 0);
+ comp->release();
+
+ // TODO legacy code threw a notification post UNPROTECTING update -- required?
+ return 0;
+}
+
+} // namespace operation
+} // namespace librbd
+
+template class librbd::operation::SnapshotUnprotectRequest<librbd::ImageCtx>;
Code Review / stor4nfv.git / blobdiff