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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_MDS_SNAP_H
#define CEPH_MDS_SNAP_H
#include <map>
#include <string_view>
#include "mdstypes.h"
#include "common/snap_types.h"
#include "Capability.h"
/*
* generic snap descriptor.
*/
struct SnapInfo {
void encode(ceph::buffer::list &bl) const;
void decode(ceph::buffer::list::const_iterator &bl);
void dump(ceph::Formatter *f) const;
static void generate_test_instances(std::list<SnapInfo*>& ls);
std::string_view get_long_name() const;
snapid_t snapid;
inodeno_t ino;
utime_t stamp;
std::string name;
mutable std::string long_name; ///< cached _$ino_$name
std::map<std::string,std::string> metadata;
};
WRITE_CLASS_ENCODER(SnapInfo)
inline bool operator==(const SnapInfo &l, const SnapInfo &r)
{
return l.snapid == r.snapid && l.ino == r.ino &&
l.stamp == r.stamp && l.name == r.name;
}
std::ostream& operator<<(std::ostream& out, const SnapInfo &sn);
/*
* SnapRealm - a subtree that shares the same set of snapshots.
*/
struct SnapRealm;
struct snaplink_t {
void encode(ceph::buffer::list &bl) const;
void decode(ceph::buffer::list::const_iterator &bl);
void dump(ceph::Formatter *f) const;
static void generate_test_instances(std::list<snaplink_t*>& ls);
inodeno_t ino;
snapid_t first;
};
WRITE_CLASS_ENCODER(snaplink_t)
std::ostream& operator<<(std::ostream& out, const snaplink_t &l);
// carry data about a specific version of a SnapRealm
struct sr_t {
void mark_parent_global() { flags |= PARENT_GLOBAL; }
void clear_parent_global() { flags &= ~PARENT_GLOBAL; }
bool is_parent_global() const { return flags & PARENT_GLOBAL; }
void mark_subvolume() { flags |= SUBVOLUME; }
void clear_subvolume() { flags &= ~SUBVOLUME; }
bool is_subvolume() const { return flags & SUBVOLUME; }
void encode(ceph::buffer::list &bl) const;
void decode(ceph::buffer::list::const_iterator &bl);
void dump(ceph::Formatter *f) const;
static void generate_test_instances(std::list<sr_t*>& ls);
snapid_t seq = 0; // basically, a version/seq # for changes to _this_ realm.
snapid_t created = 0; // when this realm was created.
snapid_t last_created = 0; // last snap created in _this_ realm.
snapid_t last_destroyed = 0; // seq for last removal
snapid_t current_parent_since = 1;
std::map<snapid_t, SnapInfo> snaps;
std::map<snapid_t, snaplink_t> past_parents; // key is "last" (or NOSNAP)
std::set<snapid_t> past_parent_snaps;
utime_t last_modified; // timestamp when this realm
// was last changed.
uint64_t change_attr = 0; // tracks changes to snap
// realm attrs.
__u32 flags = 0;
enum {
PARENT_GLOBAL = 1 << 0,
SUBVOLUME = 1 << 1,
};
};
WRITE_CLASS_ENCODER(sr_t)
class MDCache;
#endif
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