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
|
// vim: ts=8 sw=2 smarttab ft=cpp
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2022 Red Hat, Inc.
*
* 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.
*
*/
#include "common/dout.h"
#include "common/errno.h"
#include "rgw_zone.h"
#include "driver/rados/config/store.h"
#include "impl.h"
namespace rgw::rados {
// period oids
constexpr std::string_view period_info_oid_prefix = "periods.";
constexpr std::string_view period_latest_epoch_info_oid = ".latest_epoch";
constexpr std::string_view period_staging_suffix = ":staging";
static std::string period_oid(std::string_view period_id, uint32_t epoch)
{
// omit the epoch for the staging period
if (period_id.ends_with(period_staging_suffix)) {
return string_cat_reserve(period_info_oid_prefix, period_id);
}
return fmt::format("{}{}.{}", period_info_oid_prefix, period_id, epoch);
}
static std::string latest_epoch_oid(const ceph::common::ConfigProxy& conf,
std::string_view period_id)
{
return string_cat_reserve(
period_info_oid_prefix, period_id,
name_or_default(conf->rgw_period_latest_epoch_info_oid,
period_latest_epoch_info_oid));
}
static int read_latest_epoch(const DoutPrefixProvider* dpp, optional_yield y,
ConfigImpl* impl, std::string_view period_id,
uint32_t& epoch, RGWObjVersionTracker* objv)
{
const auto& pool = impl->period_pool;
const auto latest_oid = latest_epoch_oid(dpp->get_cct()->_conf, period_id);
RGWPeriodLatestEpochInfo latest;
int r = impl->read(dpp, y, pool, latest_oid, latest, objv);
if (r >= 0) {
epoch = latest.epoch;
}
return r;
}
static int write_latest_epoch(const DoutPrefixProvider* dpp, optional_yield y,
ConfigImpl* impl, bool exclusive,
std::string_view period_id, uint32_t epoch,
RGWObjVersionTracker* objv)
{
const auto& pool = impl->period_pool;
const auto latest_oid = latest_epoch_oid(dpp->get_cct()->_conf, period_id);
const auto create = exclusive ? Create::MustNotExist : Create::MayExist;
RGWPeriodLatestEpochInfo latest{epoch};
return impl->write(dpp, y, pool, latest_oid, create, latest, objv);
}
static int delete_latest_epoch(const DoutPrefixProvider* dpp, optional_yield y,
ConfigImpl* impl, std::string_view period_id,
RGWObjVersionTracker* objv)
{
const auto& pool = impl->period_pool;
const auto latest_oid = latest_epoch_oid(dpp->get_cct()->_conf, period_id);
return impl->remove(dpp, y, pool, latest_oid, objv);
}
static int update_latest_epoch(const DoutPrefixProvider* dpp, optional_yield y,
ConfigImpl* impl, std::string_view period_id,
uint32_t epoch)
{
static constexpr int MAX_RETRIES = 20;
for (int i = 0; i < MAX_RETRIES; i++) {
uint32_t existing_epoch = 0;
RGWObjVersionTracker objv;
bool exclusive = false;
// read existing epoch
int r = read_latest_epoch(dpp, y, impl, period_id, existing_epoch, &objv);
if (r == -ENOENT) {
// use an exclusive create to set the epoch atomically
exclusive = true;
objv.generate_new_write_ver(dpp->get_cct());
ldpp_dout(dpp, 20) << "creating initial latest_epoch=" << epoch
<< " for period=" << period_id << dendl;
} else if (r < 0) {
ldpp_dout(dpp, 0) << "ERROR: failed to read latest_epoch" << dendl;
return r;
} else if (epoch <= existing_epoch) {
r = -EEXIST; // fail with EEXIST if epoch is not newer
ldpp_dout(dpp, 10) << "found existing latest_epoch " << existing_epoch
<< " >= given epoch " << epoch << ", returning r=" << r << dendl;
return r;
} else {
ldpp_dout(dpp, 20) << "updating latest_epoch from " << existing_epoch
<< " -> " << epoch << " on period=" << period_id << dendl;
}
r = write_latest_epoch(dpp, y, impl, exclusive, period_id, epoch, &objv);
if (r == -EEXIST) {
continue; // exclusive create raced with another update, retry
} else if (r == -ECANCELED) {
continue; // write raced with a conflicting version, retry
}
if (r < 0) {
ldpp_dout(dpp, 0) << "ERROR: failed to write latest_epoch" << dendl;
return r;
}
return 0; // return success
}
return -ECANCELED; // fail after max retries
}
int RadosConfigStore::create_period(const DoutPrefixProvider* dpp,
optional_yield y, bool exclusive,
const RGWPeriod& info)
{
if (info.get_id().empty()) {
ldpp_dout(dpp, 0) << "period cannot have an empty id" << dendl;
return -EINVAL;
}
if (info.get_epoch() == 0) {
ldpp_dout(dpp, 0) << "period cannot have an empty epoch" << dendl;
return -EINVAL;
}
const auto& pool = impl->period_pool;
const auto info_oid = period_oid(info.get_id(), info.get_epoch());
const auto create = exclusive ? Create::MustNotExist : Create::MayExist;
RGWObjVersionTracker objv;
objv.generate_new_write_ver(dpp->get_cct());
int r = impl->write(dpp, y, pool, info_oid, create, info, &objv);
if (r < 0) {
return r;
}
(void) update_latest_epoch(dpp, y, impl.get(), info.get_id(), info.get_epoch());
return 0;
}
int RadosConfigStore::read_period(const DoutPrefixProvider* dpp,
optional_yield y,
std::string_view period_id,
std::optional<uint32_t> epoch,
RGWPeriod& info)
{
int r = 0;
if (!epoch) {
epoch = 0;
r = read_latest_epoch(dpp, y, impl.get(), period_id, *epoch, nullptr);
if (r < 0) {
return r;
}
}
const auto& pool = impl->period_pool;
const auto info_oid = period_oid(period_id, *epoch);
return impl->read(dpp, y, pool, info_oid, info, nullptr);
}
int RadosConfigStore::delete_period(const DoutPrefixProvider* dpp,
optional_yield y,
std::string_view period_id)
{
const auto& pool = impl->period_pool;
// read the latest_epoch
uint32_t latest_epoch = 0;
RGWObjVersionTracker latest_objv;
int r = read_latest_epoch(dpp, y, impl.get(), period_id,
latest_epoch, &latest_objv);
if (r < 0 && r != -ENOENT) { // just delete epoch=0 on ENOENT
ldpp_dout(dpp, 0) << "failed to read latest epoch for period "
<< period_id << ": " << cpp_strerror(r) << dendl;
return r;
}
for (uint32_t epoch = 0; epoch <= latest_epoch; epoch++) {
const auto info_oid = period_oid(period_id, epoch);
r = impl->remove(dpp, y, pool, info_oid, nullptr);
if (r < 0 && r != -ENOENT) { // ignore ENOENT
ldpp_dout(dpp, 0) << "failed to delete period " << info_oid
<< ": " << cpp_strerror(r) << dendl;
return r;
}
}
return delete_latest_epoch(dpp, y, impl.get(), period_id, &latest_objv);
}
int RadosConfigStore::list_period_ids(const DoutPrefixProvider* dpp,
optional_yield y,
const std::string& marker,
std::span<std::string> entries,
sal::ListResult<std::string>& result)
{
const auto& pool = impl->period_pool;
constexpr auto prefix = [] (std::string oid) -> std::string {
if (!oid.starts_with(period_info_oid_prefix)) {
return {};
}
if (!oid.ends_with(period_latest_epoch_info_oid)) {
return {};
}
// trim the prefix and suffix
const std::size_t count = oid.size() -
period_info_oid_prefix.size() -
period_latest_epoch_info_oid.size();
return oid.substr(period_info_oid_prefix.size(), count);
};
return impl->list(dpp, y, pool, marker, prefix, entries, result);
}
} // namespace rgw::rados
|