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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_SNAPREALM_H
#define CEPH_MDS_SNAPREALM_H
#include <string_view>
#include "mdstypes.h"
#include "snap.h"
#include "include/xlist.h"
#include "include/elist.h"
#include "common/snap_types.h"
#include "MDSContext.h"
struct SnapRealm {
protected:
// cache
mutable snapid_t cached_seq; // max seq over self and all past+present parents.
mutable snapid_t cached_last_created; // max last_created over all past+present parents
mutable snapid_t cached_last_destroyed;
mutable set<snapid_t> cached_snaps;
mutable SnapContext cached_snap_context;
mutable bufferlist cached_snap_trace;
mutable inodeno_t cached_subvolume_ino = 0;
void check_cache() const;
public:
// realm state
sr_t srnode;
// in-memory state
MDCache *mdcache;
CInode *inode;
mutable bool open = false; // set to true once all past_parents are opened
bool past_parents_dirty = false;
bool global;
SnapRealm *parent;
set<SnapRealm*> open_children; // active children that are currently open
set<SnapRealm*> open_past_children; // past children who has pinned me
map<inodeno_t, pair<SnapRealm*, set<snapid_t> > > open_past_parents; // these are explicitly pinned.
unsigned num_open_past_parents;
elist<CInode*> inodes_with_caps; // for efficient realm splits
map<client_t, xlist<Capability*>* > client_caps; // to identify clients who need snap notifications
SnapRealm(MDCache *c, CInode *in);
bool exists(std::string_view name) const {
for (map<snapid_t,SnapInfo>::const_iterator p = srnode.snaps.begin();
p != srnode.snaps.end();
++p) {
if (p->second.name == name)
return true;
}
return false;
}
bool _open_parents(MDSContext *retryorfinish, snapid_t first=1, snapid_t last=CEPH_NOSNAP);
bool open_parents(MDSContext *retryorfinish);
void _remove_missing_parent(snapid_t snapid, inodeno_t parent, int err);
bool have_past_parents_open(snapid_t first=1, snapid_t last=CEPH_NOSNAP) const;
void add_open_past_parent(SnapRealm *parent, snapid_t last);
void remove_open_past_parent(inodeno_t ino, snapid_t last);
void close_parents();
void prune_past_parents();
bool has_past_parents() const {
return !srnode.past_parent_snaps.empty() ||
!srnode.past_parents.empty();
}
void build_snap_set() const;
void get_snap_info(map<snapid_t, const SnapInfo*>& infomap, snapid_t first=0, snapid_t last=CEPH_NOSNAP);
const bufferlist& get_snap_trace() const;
void build_snap_trace() const;
std::string_view get_snapname(snapid_t snapid, inodeno_t atino);
snapid_t resolve_snapname(std::string_view name, inodeno_t atino, snapid_t first=0, snapid_t last=CEPH_NOSNAP);
const set<snapid_t>& get_snaps() const;
const SnapContext& get_snap_context() const;
void invalidate_cached_snaps() {
cached_seq = 0;
}
snapid_t get_last_created() {
check_cache();
return cached_last_created;
}
snapid_t get_last_destroyed() {
check_cache();
return cached_last_destroyed;
}
snapid_t get_newest_snap() {
check_cache();
if (cached_snaps.empty())
return 0;
else
return *cached_snaps.rbegin();
}
snapid_t get_newest_seq() {
check_cache();
return cached_seq;
}
snapid_t get_snap_following(snapid_t follows) {
check_cache();
const set<snapid_t>& s = get_snaps();
set<snapid_t>::const_iterator p = s.upper_bound(follows);
if (p != s.end())
return *p;
return CEPH_NOSNAP;
}
bool has_snaps_in_range(snapid_t first, snapid_t last) {
check_cache();
const set<snapid_t>& s = get_snaps();
set<snapid_t>::const_iterator p = s.lower_bound(first);
return (p != s.end() && *p <= last);
}
inodeno_t get_subvolume_ino() {
check_cache();
return cached_subvolume_ino;
}
void adjust_parent();
void split_at(SnapRealm *child);
void merge_to(SnapRealm *newparent);
void add_cap(client_t client, Capability *cap) {
auto client_caps_entry = client_caps.find(client);
if (client_caps_entry == client_caps.end())
client_caps_entry = client_caps.emplace(client,
new xlist<Capability*>).first;
client_caps_entry->second->push_back(&cap->item_snaprealm_caps);
}
void remove_cap(client_t client, Capability *cap) {
cap->item_snaprealm_caps.remove_myself();
auto found = client_caps.find(client);
if (found != client_caps.end() && found->second->empty()) {
delete found->second;
client_caps.erase(found);
}
}
};
ostream& operator<<(ostream& out, const SnapRealm &realm);
#endif
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