diff options
Diffstat (limited to 'src/librbd/api/Snapshot.cc')
| -rw-r--r-- | src/librbd/api/Snapshot.cc | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/src/librbd/api/Snapshot.cc b/src/librbd/api/Snapshot.cc new file mode 100644 index 00000000..3d29cfb2 --- /dev/null +++ b/src/librbd/api/Snapshot.cc @@ -0,0 +1,196 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab + +#include "librbd/api/Snapshot.h" +#include "cls/rbd/cls_rbd_types.h" +#include "common/errno.h" +#include "librbd/ImageCtx.h" +#include "librbd/ImageState.h" +#include "librbd/Operations.h" +#include "librbd/Utils.h" +#include <boost/variant.hpp> +#include "include/Context.h" +#include "common/Cond.h" + +#define dout_subsys ceph_subsys_rbd +#undef dout_prefix +#define dout_prefix *_dout << "librbd::api::Snapshot: " << __func__ << ": " + +namespace librbd { +namespace api { + +namespace { + +class GetGroupVisitor : public boost::static_visitor<int> { +public: + CephContext* cct; + librados::IoCtx *image_ioctx; + snap_group_namespace_t *group_snap; + + explicit GetGroupVisitor(CephContext* cct, librados::IoCtx *_image_ioctx, + snap_group_namespace_t *group_snap) + : cct(cct), image_ioctx(_image_ioctx), group_snap(group_snap) {}; + + template <typename T> + inline int operator()(const T&) const { + // ignore other than GroupSnapshotNamespace types. + return -EINVAL; + } + + inline int operator()( + const cls::rbd::GroupSnapshotNamespace& snap_namespace) { + IoCtx group_ioctx; + int r = util::create_ioctx(*image_ioctx, "group", snap_namespace.group_pool, + {}, &group_ioctx); + if (r < 0) { + return r; + } + + cls::rbd::GroupSnapshot group_snapshot; + + std::string group_name; + r = cls_client::dir_get_name(&group_ioctx, RBD_GROUP_DIRECTORY, + snap_namespace.group_id, &group_name); + if (r < 0) { + lderr(cct) << "failed to retrieve group name: " << cpp_strerror(r) + << dendl; + return r; + } + + string group_header_oid = util::group_header_name(snap_namespace.group_id); + r = cls_client::group_snap_get_by_id(&group_ioctx, + group_header_oid, + snap_namespace.group_snapshot_id, + &group_snapshot); + if (r < 0) { + lderr(cct) << "failed to retrieve group snapshot: " << cpp_strerror(r) + << dendl; + return r; + } + + group_snap->group_pool = group_ioctx.get_id(); + group_snap->group_name = group_name; + group_snap->group_snap_name = group_snapshot.name; + return 0; + } +}; + +class GetTrashVisitor : public boost::static_visitor<int> { +public: + std::string* original_name; + + explicit GetTrashVisitor(std::string* original_name) + : original_name(original_name) { + } + + template <typename T> + inline int operator()(const T&) const { + return -EINVAL; + } + + inline int operator()( + const cls::rbd::TrashSnapshotNamespace& snap_namespace) { + *original_name = snap_namespace.original_name; + return 0; + } +}; + +} // anonymous namespace + +template <typename I> +int Snapshot<I>::get_group_namespace(I *ictx, uint64_t snap_id, + snap_group_namespace_t *group_snap) { + int r = ictx->state->refresh_if_required(); + if (r < 0) { + return r; + } + + RWLock::RLocker snap_locker(ictx->snap_lock); + auto snap_info = ictx->get_snap_info(snap_id); + if (snap_info == nullptr) { + return -ENOENT; + } + + GetGroupVisitor ggv = GetGroupVisitor(ictx->cct, &ictx->md_ctx, group_snap); + r = boost::apply_visitor(ggv, snap_info->snap_namespace); + if (r < 0) { + return r; + } + + return 0; +} + +template <typename I> +int Snapshot<I>::get_trash_namespace(I *ictx, uint64_t snap_id, + std::string* original_name) { + int r = ictx->state->refresh_if_required(); + if (r < 0) { + return r; + } + + RWLock::RLocker snap_locker(ictx->snap_lock); + auto snap_info = ictx->get_snap_info(snap_id); + if (snap_info == nullptr) { + return -ENOENT; + } + + auto visitor = GetTrashVisitor(original_name); + r = boost::apply_visitor(visitor, snap_info->snap_namespace); + if (r < 0) { + return r; + } + + return 0; +} + +template <typename I> +int Snapshot<I>::get_namespace_type(I *ictx, uint64_t snap_id, + snap_namespace_type_t *namespace_type) { + int r = ictx->state->refresh_if_required(); + if (r < 0) { + return r; + } + + RWLock::RLocker l(ictx->snap_lock); + auto snap_info = ictx->get_snap_info(snap_id); + if (snap_info == nullptr) { + return -ENOENT; + } + + *namespace_type = static_cast<snap_namespace_type_t>( + cls::rbd::get_snap_namespace_type(snap_info->snap_namespace)); + return 0; +} + +template <typename I> +int Snapshot<I>::remove(I *ictx, uint64_t snap_id) { + ldout(ictx->cct, 20) << "snap_remove " << ictx << " " << snap_id << dendl; + + int r = ictx->state->refresh_if_required(); + if (r < 0) { + return r; + } + + cls::rbd::SnapshotNamespace snapshot_namespace; + std::string snapshot_name; + { + RWLock::RLocker snap_locker(ictx->snap_lock); + auto it = ictx->snap_info.find(snap_id); + if (it == ictx->snap_info.end()) { + return -ENOENT; + } + + snapshot_namespace = it->second.snap_namespace; + snapshot_name = it->second.name; + } + + C_SaferCond ctx; + ictx->operations->snap_remove(snapshot_namespace, snapshot_name, &ctx); + r = ctx.wait(); + return r; +} + +} // namespace api +} // namespace librbd + +template class librbd::api::Snapshot<librbd::ImageCtx>; |