1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
// -*- 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 "include/filepath.h"
#include "messages/MMDSOp.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 final : public MMDSOp {
private:
static constexpr int HEAD_VERSION = 2;
static constexpr int COMPAT_VERSION = 2;
// info about original request
inodeno_t base_ino;
frag_t base_dir_frag;
bool wanted_base_dir = false;
bool path_locked = 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;
ceph::buffer::list 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 is_path_locked() const { return path_locked; }
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() : MMDSOp{MSG_MDS_DISCOVERREPLY, HEAD_VERSION, COMPAT_VERSION} { }
MDiscoverReply(const MDiscover &dis) :
MMDSOp{MSG_MDS_DISCOVERREPLY, HEAD_VERSION, COMPAT_VERSION},
base_ino(dis.get_base_ino()),
base_dir_frag(dis.get_base_dir_frag()),
wanted_base_dir(dis.wants_base_dir()),
path_locked(dis.is_path_locked()),
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) :
MMDSOp{MSG_MDS_DISCOVERREPLY, HEAD_VERSION, COMPAT_VERSION},
base_ino(df.ino),
base_dir_frag(df.frag),
wanted_base_dir(false),
path_locked(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() final {}
public:
std::string_view get_type_name() const override { return "discover_reply"; }
void print(std::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 {
using ceph::decode;
auto p = payload.cbegin();
decode(base_ino, p);
decode(base_dir_frag, p);
decode(wanted_base_dir, p);
decode(path_locked, 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(path_locked, 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);
}
private:
template<class T, typename... Args>
friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
};
#endif
|
