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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- | |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net> | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | ||
15 | #ifndef CEPH_MCLIENTSESSION_H | |
16 | #define CEPH_MCLIENTSESSION_H | |
17 | ||
18 | #include "msg/Message.h" | |
19 | #include "mds/mdstypes.h" | |
20 | ||
21 | class MClientSession final : public SafeMessage { | |
22 | private: | |
23 | static constexpr int HEAD_VERSION = 5; | |
24 | static constexpr int COMPAT_VERSION = 1; | |
25 | ||
26 | public: | |
27 | ceph_mds_session_head head; | |
28 | static constexpr unsigned SESSION_BLOCKLISTED = (1<<0); | |
29 | ||
30 | unsigned flags = 0; | |
31 | std::map<std::string, std::string> metadata; | |
32 | feature_bitset_t supported_features; | |
33 | metric_spec_t metric_spec; | |
34 | ||
35 | int get_op() const { return head.op; } | |
36 | version_t get_seq() const { return head.seq; } | |
37 | utime_t get_stamp() const { return utime_t(head.stamp); } | |
38 | int get_max_caps() const { return head.max_caps; } | |
39 | int get_max_leases() const { return head.max_leases; } | |
40 | ||
41 | protected: | |
42 | MClientSession() : SafeMessage{CEPH_MSG_CLIENT_SESSION, HEAD_VERSION, COMPAT_VERSION} { } | |
43 | MClientSession(int o, version_t s=0, unsigned msg_flags=0) : | |
44 | SafeMessage{CEPH_MSG_CLIENT_SESSION, HEAD_VERSION, COMPAT_VERSION}, | |
45 | flags(msg_flags) { | |
46 | memset(&head, 0, sizeof(head)); | |
47 | head.op = o; | |
48 | head.seq = s; | |
49 | } | |
50 | MClientSession(int o, utime_t st) : | |
51 | SafeMessage{CEPH_MSG_CLIENT_SESSION, HEAD_VERSION, COMPAT_VERSION} { | |
52 | memset(&head, 0, sizeof(head)); | |
53 | head.op = o; | |
54 | head.seq = 0; | |
55 | st.encode_timeval(&head.stamp); | |
56 | } | |
57 | ~MClientSession() final {} | |
58 | ||
59 | public: | |
60 | std::string_view get_type_name() const override { return "client_session"; } | |
61 | void print(std::ostream& out) const override { | |
62 | out << "client_session(" << ceph_session_op_name(get_op()); | |
63 | if (get_seq()) | |
64 | out << " seq " << get_seq(); | |
65 | if (get_op() == CEPH_SESSION_RECALL_STATE) | |
66 | out << " max_caps " << head.max_caps << " max_leases " << head.max_leases; | |
67 | out << ")"; | |
68 | } | |
69 | ||
70 | void decode_payload() override { | |
71 | using ceph::decode; | |
72 | auto p = payload.cbegin(); | |
73 | decode(head, p); | |
74 | if (header.version >= 2) | |
75 | decode(metadata, p); | |
76 | if (header.version >= 3) | |
77 | decode(supported_features, p); | |
78 | if (header.version >= 4) { | |
79 | decode(metric_spec, p); | |
80 | } | |
81 | if (header.version >= 5) { | |
82 | decode(flags, p); | |
83 | } | |
84 | } | |
85 | void encode_payload(uint64_t features) override { | |
86 | using ceph::encode; | |
87 | encode(head, payload); | |
88 | if (metadata.empty() && supported_features.empty()) { | |
89 | // If we're not trying to send any metadata (always the case if | |
90 | // we are a server) then send older-format message to avoid upsetting | |
91 | // old kernel clients. | |
92 | header.version = 1; | |
93 | } else { | |
94 | header.version = HEAD_VERSION; | |
95 | encode(metadata, payload); | |
96 | encode(supported_features, payload); | |
97 | encode(metric_spec, payload); | |
98 | encode(flags, payload); | |
99 | } | |
100 | } | |
101 | private: | |
102 | template<class T, typename... Args> | |
103 | friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args); | |
104 | template<class T, typename... Args> | |
105 | friend MURef<T> crimson::make_message(Args&&... args); | |
106 | }; | |
107 | ||
108 | #endif |