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
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
// -*- 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) 2012 Red Hat
*
* 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 MDS_CONTEXT_H
#define MDS_CONTEXT_H
#include <vector>
#include <deque>
#include "include/Context.h"
#include "include/elist.h"
#include "common/ceph_time.h"
class MDSRank;
/**
* Completion which has access to a reference to the global MDS instance.
*
* This class exists so that Context subclasses can provide the MDS pointer
* from a pointer they already had, e.g. MDCache or Locker, rather than
* necessarily having to carry around an extra MDS* pointer.
*/
class MDSContext : public Context
{
protected:
virtual MDSRank *get_mds() = 0;
};
/**
* A context which must be called with the big MDS lock held. Subclass
* this with a get_mds implementation.
*/
class MDSInternalContextBase : public MDSContext
{
public:
template<template<typename> class A>
using vec_alloc = std::vector<MDSInternalContextBase *, A<MDSInternalContextBase *>>;
using vec = vec_alloc<std::allocator>;
template<template<typename> class A>
using que_alloc = std::deque<MDSInternalContextBase *, A<MDSInternalContextBase *>>;
using que = que_alloc<std::allocator>;
void complete(int r) override;
};
/**
* General purpose, lets you pass in an MDS pointer.
*/
class MDSInternalContext : public MDSInternalContextBase
{
protected:
MDSRank *mds;
MDSRank* get_mds() override;
public:
explicit MDSInternalContext(MDSRank *mds_) : mds(mds_) {
assert(mds != NULL);
}
};
/**
* Wrap a regular Context up as an Internal context. Useful
* if you're trying to work with one of our more generic frameworks.
*/
class MDSInternalContextWrapper : public MDSInternalContextBase
{
protected:
MDSRank *mds;
Context *fin;
MDSRank *get_mds() override;
void finish(int r) override;
public:
MDSInternalContextWrapper(MDSRank *m, Context *c) : mds(m), fin(c) {}
};
class MDSIOContextBase : public MDSContext
{
public:
MDSIOContextBase(bool track=true);
virtual ~MDSIOContextBase();
MDSIOContextBase(const MDSIOContextBase&) = delete;
MDSIOContextBase& operator=(const MDSIOContextBase&) = delete;
void complete(int r) override;
virtual void print(ostream& out) const = 0;
static bool check_ios_in_flight(ceph::coarse_mono_time cutoff,
std::string& slow_count,
ceph::coarse_mono_time& oldest);
private:
ceph::coarse_mono_time created_at;
elist<MDSIOContextBase*>::item list_item;
static elist<MDSIOContextBase*> ctx_list;
static ceph::spinlock ctx_list_lock;
};
/**
* Completion for an log operation, takes big MDSRank lock
* before executing finish function. Update log's safe pos
* after finish functuon return.
*/
class MDSLogContextBase : public MDSIOContextBase
{
protected:
uint64_t write_pos;
public:
MDSLogContextBase() : write_pos(0) {}
void complete(int r) final;
void set_write_pos(uint64_t wp) { write_pos = wp; }
virtual void pre_finish(int r) {}
void print(ostream& out) const override {
out << "log_event(" << write_pos << ")";
}
};
/**
* Completion for an I/O operation, takes big MDSRank lock
* before executing finish function.
*/
class MDSIOContext : public MDSIOContextBase
{
protected:
MDSRank *mds;
MDSRank* get_mds() override;
public:
explicit MDSIOContext(MDSRank *mds_) : mds(mds_) {
assert(mds != NULL);
}
};
/**
* Wrap a regular Context up as an IO Context. Useful
* if you're trying to work with one of our more generic frameworks.
*/
class MDSIOContextWrapper : public MDSIOContextBase
{
protected:
MDSRank *mds;
Context *fin;
MDSRank *get_mds() override;
public:
MDSIOContextWrapper(MDSRank *m, Context *c) : mds(m), fin(c) {}
void finish(int r) override;
void print(ostream& out) const override {
out << "io_context_wrapper(" << fin << ")";
}
};
/**
* No-op for callers expecting MDSInternalContextBase
*/
class C_MDSInternalNoop final : public MDSInternalContextBase
{
MDSRank* get_mds() override {ceph_abort();}
public:
void finish(int r) override {}
void complete(int r) override { delete this; }
};
/**
* This class is used where you have an MDSInternalContextBase but
* you sometimes want to call it back from an I/O completion.
*/
class C_IO_Wrapper : public MDSIOContext
{
protected:
bool async;
MDSInternalContextBase *wrapped;
void finish(int r) override {
wrapped->complete(r);
wrapped = nullptr;
}
public:
C_IO_Wrapper(MDSRank *mds_, MDSInternalContextBase *wrapped_) :
MDSIOContext(mds_), async(true), wrapped(wrapped_) {
assert(wrapped != NULL);
}
~C_IO_Wrapper() override {
if (wrapped != nullptr) {
delete wrapped;
wrapped = nullptr;
}
}
void complete(int r) final;
void print(ostream& out) const override {
out << "io_wrapper(" << wrapped << ")";
}
};
/**
* Gather needs a default-constructable class
*/
class MDSInternalContextGather : public MDSInternalContextBase
{
protected:
MDSRank *get_mds() override;
};
class MDSGather : public C_GatherBase<MDSInternalContextBase, MDSInternalContextGather>
{
public:
MDSGather(CephContext *cct, MDSInternalContextBase *onfinish) : C_GatherBase<MDSInternalContextBase, MDSInternalContextGather>(cct, onfinish) {}
protected:
MDSRank *get_mds() override {return NULL;}
};
typedef C_GatherBuilderBase<MDSInternalContextBase, MDSGather> MDSGatherBuilder;
using MDSContextFactory = ContextFactory<MDSInternalContextBase>;
#endif // MDS_CONTEXT_H
|
