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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_INODE_BACKTRACE_H
#define CEPH_INODE_BACKTRACE_H
#include <string_view>
#include "mdstypes.h"
namespace ceph {
class Formatter;
}
/** metadata backpointers **/
/*
* - inode_backpointer_t is just the _pointer_ portion; it doesn't
* tell us who we point _from_.
*
* - it _does_ include a version of the source object, so we can look
* at two different pointers (from the same inode) and tell which is
* newer.
*/
struct inode_backpointer_t {
inodeno_t dirino; // containing directory ino
string dname; // linking dentry name
version_t version; // child's version at time of backpointer creation
inode_backpointer_t() : version(0) {}
inode_backpointer_t(inodeno_t i, std::string_view d, version_t v) : dirino(i), dname(d), version(v) {}
void encode(bufferlist& bl) const;
void decode(bufferlist::const_iterator &bl);
void decode_old(bufferlist::const_iterator &bl);
void dump(Formatter *f) const;
static void generate_test_instances(list<inode_backpointer_t*>& ls);
};
WRITE_CLASS_ENCODER(inode_backpointer_t)
inline bool operator==(const inode_backpointer_t& l, const inode_backpointer_t& r) {
return l.dirino == r.dirino && l.version == r.version && l.dname == r.dname;
}
inline ostream& operator<<(ostream& out, const inode_backpointer_t& ib) {
return out << "<" << ib.dirino << "/" << ib.dname << " v" << ib.version << ">";
}
/*
* inode_backtrace_t is a complete ancestor backtraces for a given inode.
* we include who _we_ are, so that the backtrace can stand alone (as, say,
* an xattr on an object).
*/
struct inode_backtrace_t {
inodeno_t ino; // my ino
vector<inode_backpointer_t> ancestors;
int64_t pool;
// we use a set for old_pools to avoid duplicate entries, e.g. setlayout 0, 1, 0
set<int64_t> old_pools;
inode_backtrace_t() : pool(-1) {}
void encode(bufferlist& bl) const;
void decode(bufferlist::const_iterator &bl);
void dump(Formatter *f) const;
static void generate_test_instances(list<inode_backtrace_t*>& ls);
/**
* Compare two backtraces *for the same inode*.
* @pre The backtraces are for the same inode
*
* @param other The backtrace to compare ourselves with
* @param equivalent A bool pointer which will be set to true if
* the other backtrace is equivalent to our own (has the same dentries)
* @param divergent A bool pointer which will be set to true if
* the backtraces have differing entries without versions supporting them
*
* @returns 1 if we are newer than the other, 0 if equal, -1 if older
*/
int compare(const inode_backtrace_t& other,
bool *equivalent, bool *divergent) const;
};
WRITE_CLASS_ENCODER(inode_backtrace_t)
inline ostream& operator<<(ostream& out, const inode_backtrace_t& it) {
return out << "(" << it.pool << ")" << it.ino << ":" << it.ancestors << "//" << it.old_pools;
}
inline bool operator==(const inode_backtrace_t& l,
const inode_backtrace_t& r) {
return l.ino == r.ino &&
l.pool == r.pool &&
l.old_pools == r.old_pools &&
l.ancestors == r.ancestors;
}
#endif
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