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// -*- 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>;
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