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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_MDISCOVERREPLY_H
#define CEPH_MDISCOVERREPLY_H
#include "msg/Message.h"
#include "include/filepath.h"
#include <string>
/**
* MDiscoverReply - return new replicas (of inodes, dirs, dentries)
*
* we group returned items by (dir, dentry, inode). each
* item in each set shares an index (it's "depth").
*
* we can start and end with any type.
* no_base_dir = true if the first group has an inode but no dir
* no_base_dentry = true if the first group has an inode but no dentry
* they are false if there is no returned data, ie the first group is empty.
*
* we also return errors:
* error_flag_dn(std::string) - the specified dentry dne
* error_flag_dir - the last item wasn't a dir, so we couldn't continue.
*
* and sometimes,
* dir_auth_hint - where we think the dir auth is
*
* depth() gives us the number of depth units/indices for which we have
* information. this INCLUDES those for which we have errors but no data.
*
* see MDCache::handle_discover, handle_discover_reply.
*
*
* so basically, we get
*
* dir den ino i
* x 0
* x x x 1
* or
* x x 0
* x x x 1
* or
* x x x 0
* x x x 1
* ...and trail off however we want.
*
*
*/
class MDiscoverReply : public MessageInstance<MDiscoverReply> {
public:
friend factory;
private:
static constexpr int HEAD_VERSION = 2;
// info about original request
inodeno_t base_ino;
frag_t base_dir_frag;
bool wanted_base_dir = false;
bool wanted_xlocked = false;
snapid_t wanted_snapid;
// and the response
bool flag_error_dn = false;
bool flag_error_dir = false;
std::string error_dentry; // dentry that was not found (to trigger waiters on asker)
bool unsolicited = false;
mds_rank_t dir_auth_hint = 0;
public:
__u8 starts_with = 0;
bufferlist trace;
enum { DIR, DENTRY, INODE };
// accessors
inodeno_t get_base_ino() const { return base_ino; }
frag_t get_base_dir_frag() const { return base_dir_frag; }
bool get_wanted_base_dir() const { return wanted_base_dir; }
bool get_wanted_xlocked() const { return wanted_xlocked; }
snapid_t get_wanted_snapid() const { return wanted_snapid; }
bool is_flag_error_dn() const { return flag_error_dn; }
bool is_flag_error_dir() const { return flag_error_dir; }
const std::string& get_error_dentry() const { return error_dentry; }
int get_starts_with() const { return starts_with; }
mds_rank_t get_dir_auth_hint() const { return dir_auth_hint; }
bool is_unsolicited() const { return unsolicited; }
void mark_unsolicited() { unsolicited = true; }
void set_base_dir_frag(frag_t df) { base_dir_frag = df; }
protected:
MDiscoverReply() : MessageInstance(MSG_MDS_DISCOVERREPLY, HEAD_VERSION) { }
MDiscoverReply(const MDiscover &dis) :
MessageInstance(MSG_MDS_DISCOVERREPLY, HEAD_VERSION),
base_ino(dis.get_base_ino()),
base_dir_frag(dis.get_base_dir_frag()),
wanted_base_dir(dis.wants_base_dir()),
wanted_xlocked(dis.wants_xlocked()),
wanted_snapid(dis.get_snapid()),
flag_error_dn(false),
flag_error_dir(false),
unsolicited(false),
dir_auth_hint(CDIR_AUTH_UNKNOWN),
starts_with(DIR)
{
header.tid = dis.get_tid();
}
MDiscoverReply(dirfrag_t df) :
MessageInstance(MSG_MDS_DISCOVERREPLY, HEAD_VERSION),
base_ino(df.ino),
base_dir_frag(df.frag),
wanted_base_dir(false),
wanted_xlocked(false),
wanted_snapid(CEPH_NOSNAP),
flag_error_dn(false),
flag_error_dir(false),
unsolicited(false),
dir_auth_hint(CDIR_AUTH_UNKNOWN),
starts_with(DIR)
{
header.tid = 0;
}
~MDiscoverReply() override {}
public:
std::string_view get_type_name() const override { return "discover_reply"; }
void print(ostream& out) const override {
out << "discover_reply(" << header.tid << " " << base_ino << ")";
}
// builders
bool is_empty() const {
return trace.length() == 0 &&
!flag_error_dn &&
!flag_error_dir &&
dir_auth_hint == CDIR_AUTH_UNKNOWN;
}
// void set_flag_forward() { flag_forward = true; }
void set_flag_error_dn(std::string_view dn) {
flag_error_dn = true;
error_dentry = dn;
}
void set_flag_error_dir() {
flag_error_dir = true;
}
void set_dir_auth_hint(int a) {
dir_auth_hint = a;
}
void set_error_dentry(std::string_view dn) {
error_dentry = dn;
}
// ...
void decode_payload() override {
auto p = payload.cbegin();
decode(base_ino, p);
decode(base_dir_frag, p);
decode(wanted_base_dir, p);
decode(wanted_xlocked, p);
decode(wanted_snapid, p);
decode(flag_error_dn, p);
decode(flag_error_dir, p);
decode(error_dentry, p);
decode(dir_auth_hint, p);
decode(unsolicited, p);
decode(starts_with, p);
decode(trace, p);
}
void encode_payload(uint64_t features) override {
using ceph::encode;
encode(base_ino, payload);
encode(base_dir_frag, payload);
encode(wanted_base_dir, payload);
encode(wanted_xlocked, payload);
encode(wanted_snapid, payload);
encode(flag_error_dn, payload);
encode(flag_error_dir, payload);
encode(error_dentry, payload);
encode(dir_auth_hint, payload);
encode(unsolicited, payload);
encode(starts_with, payload);
encode(trace, payload);
}
};
#endif
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