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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 | #ifndef CEPH_LIBRBD_IMAGE_SNAP_SET_REQUEST_H | |
5 | #define CEPH_LIBRBD_IMAGE_SNAP_SET_REQUEST_H | |
6 | ||
7 | #include "cls/rbd/cls_rbd_client.h" | |
8 | #include <string> | |
9 | ||
10 | class Context; | |
11 | ||
12 | namespace librbd { | |
13 | ||
14 | template <typename> class ExclusiveLock; | |
15 | class ImageCtx; | |
16 | template <typename> class ObjectMap; | |
17 | ||
18 | namespace image { | |
19 | ||
20 | template <typename> class RefreshParentRequest; | |
21 | ||
22 | template <typename ImageCtxT = ImageCtx> | |
23 | class SetSnapRequest { | |
24 | public: | |
25 | static SetSnapRequest *create(ImageCtxT &image_ctx, | |
26 | const cls::rbd::SnapshotNamespace& snap_namespace, | |
27 | const std::string &snap_name, | |
28 | Context *on_finish) { | |
29 | return new SetSnapRequest(image_ctx, snap_namespace, snap_name, on_finish); | |
30 | } | |
31 | ||
32 | ~SetSnapRequest(); | |
33 | ||
34 | void send(); | |
35 | ||
36 | private: | |
37 | /** | |
38 | * @verbatim | |
39 | * | |
40 | * <start> | |
41 | * | | |
42 | * | (set snap) | |
43 | * |-----------> BLOCK_WRITES | |
44 | * | | | |
45 | * | v | |
46 | * | SHUTDOWN_EXCLUSIVE_LOCK (skip if lock inactive | |
47 | * | | or disabled) | |
48 | * | v | |
49 | * | REFRESH_PARENT (skip if no parent | |
50 | * | | or refresh not needed) | |
51 | * | v | |
52 | * | OPEN_OBJECT_MAP (skip if map disabled) | |
53 | * | | | |
54 | * | v | |
55 | * | <apply> | |
56 | * | | | |
57 | * | v | |
58 | * | FINALIZE_REFRESH_PARENT (skip if no parent | |
59 | * | | or refresh not needed) | |
60 | * | v | |
61 | * | <finish> | |
62 | * | | |
63 | * \-----------> INIT_EXCLUSIVE_LOCK (skip if active or | |
64 | * | disabled) | |
65 | * v | |
66 | * REFRESH_PARENT (skip if no parent | |
67 | * | or refresh not needed) | |
68 | * v | |
69 | * <apply> | |
70 | * | | |
71 | * v | |
72 | * FINALIZE_REFRESH_PARENT (skip if no parent | |
73 | * | or refresh not needed) | |
74 | * v | |
75 | * <finish> | |
76 | * | |
77 | * @endverbatim | |
78 | */ | |
79 | ||
80 | SetSnapRequest(ImageCtxT &image_ctx, const cls::rbd::SnapshotNamespace& snap_namespace, | |
81 | const std::string &snap_name, | |
82 | Context *on_finish); | |
83 | ||
84 | ImageCtxT &m_image_ctx; | |
85 | cls::rbd::SnapshotNamespace m_snap_namespace; | |
86 | std::string m_snap_name; | |
87 | Context *m_on_finish; | |
88 | ||
89 | uint64_t m_snap_id; | |
90 | ExclusiveLock<ImageCtxT> *m_exclusive_lock; | |
91 | ObjectMap<ImageCtxT> *m_object_map; | |
92 | RefreshParentRequest<ImageCtxT> *m_refresh_parent; | |
93 | ||
94 | bool m_writes_blocked; | |
95 | ||
96 | void send_block_writes(); | |
97 | Context *handle_block_writes(int *result); | |
98 | ||
99 | void send_init_exclusive_lock(); | |
100 | Context *handle_init_exclusive_lock(int *result); | |
101 | ||
102 | Context *send_shut_down_exclusive_lock(int *result); | |
103 | Context *handle_shut_down_exclusive_lock(int *result); | |
104 | ||
105 | Context *send_refresh_parent(int *result); | |
106 | Context *handle_refresh_parent(int *result); | |
107 | ||
108 | Context *send_open_object_map(int *result); | |
109 | Context *handle_open_object_map(int *result); | |
110 | ||
111 | Context *send_finalize_refresh_parent(int *result); | |
112 | Context *handle_finalize_refresh_parent(int *result); | |
113 | ||
114 | int apply(); | |
115 | void finalize(); | |
116 | void send_complete(); | |
117 | }; | |
118 | ||
119 | } // namespace image | |
120 | } // namespace librbd | |
121 | ||
122 | extern template class librbd::image::SetSnapRequest<librbd::ImageCtx>; | |
123 | ||
124 | #endif // CEPH_LIBRBD_IMAGE_SNAP_SET_REQUEST_H |