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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 | #include "tools/rbd_mirror/image_replayer/PrepareLocalImageRequest.h" | |
5 | #include "include/rados/librados.hpp" | |
6 | #include "cls/rbd/cls_rbd_client.h" | |
7 | #include "common/errno.h" | |
8 | #include "librbd/ImageCtx.h" | |
9 | #include "librbd/Journal.h" | |
10 | #include "librbd/Utils.h" | |
11 | #include "tools/rbd_mirror/Threads.h" | |
d2e6a577 | 12 | #include "tools/rbd_mirror/image_replayer/GetMirrorImageIdRequest.h" |
7c673cae FG |
13 | #include <type_traits> |
14 | ||
15 | #define dout_context g_ceph_context | |
16 | #define dout_subsys ceph_subsys_rbd_mirror | |
17 | #undef dout_prefix | |
18 | #define dout_prefix *_dout << "rbd::mirror::image_replayer::" \ | |
19 | << "PrepareLocalImageRequest: " << this << " " \ | |
20 | << __func__ << ": " | |
21 | ||
22 | namespace rbd { | |
23 | namespace mirror { | |
24 | namespace image_replayer { | |
25 | ||
26 | using librbd::util::create_context_callback; | |
27 | using librbd::util::create_rados_callback; | |
28 | ||
29 | template <typename I> | |
30 | void PrepareLocalImageRequest<I>::send() { | |
31 | dout(20) << dendl; | |
32 | get_local_image_id(); | |
33 | } | |
34 | ||
35 | template <typename I> | |
36 | void PrepareLocalImageRequest<I>::get_local_image_id() { | |
37 | dout(20) << dendl; | |
38 | ||
d2e6a577 | 39 | Context *ctx = create_context_callback< |
7c673cae | 40 | PrepareLocalImageRequest<I>, |
d2e6a577 FG |
41 | &PrepareLocalImageRequest<I>::handle_get_local_image_id>(this); |
42 | auto req = GetMirrorImageIdRequest<I>::create(m_io_ctx, m_global_image_id, | |
43 | m_local_image_id, ctx); | |
44 | req->send(); | |
7c673cae FG |
45 | } |
46 | ||
47 | template <typename I> | |
48 | void PrepareLocalImageRequest<I>::handle_get_local_image_id(int r) { | |
7c673cae FG |
49 | dout(20) << "r=" << r << ", " |
50 | << "local_image_id=" << *m_local_image_id << dendl; | |
51 | ||
52 | if (r < 0) { | |
7c673cae FG |
53 | finish(r); |
54 | return; | |
55 | } | |
56 | ||
57 | get_mirror_state(); | |
58 | } | |
59 | ||
60 | template <typename I> | |
61 | void PrepareLocalImageRequest<I>::get_mirror_state() { | |
62 | dout(20) << dendl; | |
63 | ||
64 | librados::ObjectReadOperation op; | |
65 | librbd::cls_client::mirror_image_get_start(&op, *m_local_image_id); | |
66 | ||
67 | m_out_bl.clear(); | |
68 | librados::AioCompletion *aio_comp = create_rados_callback< | |
69 | PrepareLocalImageRequest<I>, | |
70 | &PrepareLocalImageRequest<I>::handle_get_mirror_state>(this); | |
71 | int r = m_io_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op, &m_out_bl); | |
72 | assert(r == 0); | |
73 | aio_comp->release(); | |
74 | } | |
75 | ||
76 | template <typename I> | |
77 | void PrepareLocalImageRequest<I>::handle_get_mirror_state(int r) { | |
78 | dout(20) << ": r=" << r << dendl; | |
79 | ||
80 | cls::rbd::MirrorImage mirror_image; | |
81 | if (r == 0) { | |
82 | bufferlist::iterator iter = m_out_bl.begin(); | |
83 | r = librbd::cls_client::mirror_image_get_finish(&iter, &mirror_image); | |
84 | } | |
85 | ||
86 | if (r < 0) { | |
87 | derr << "failed to retrieve image mirror state: " << cpp_strerror(r) | |
88 | << dendl; | |
89 | finish(r); | |
90 | return; | |
91 | } | |
92 | ||
93 | // TODO save current mirror state to determine if we should | |
94 | // delete a partially formed image | |
95 | // (e.g. MIRROR_IMAGE_STATE_CREATING/DELETING) | |
96 | ||
97 | get_tag_owner(); | |
98 | } | |
99 | ||
100 | template <typename I> | |
101 | void PrepareLocalImageRequest<I>::get_tag_owner() { | |
102 | // deduce the class type for the journal to support unit tests | |
103 | using Journal = typename std::decay< | |
104 | typename std::remove_pointer<decltype(std::declval<I>().journal)> | |
105 | ::type>::type; | |
106 | ||
107 | dout(20) << dendl; | |
108 | ||
109 | Context *ctx = create_context_callback< | |
110 | PrepareLocalImageRequest<I>, | |
111 | &PrepareLocalImageRequest<I>::handle_get_tag_owner>(this); | |
112 | Journal::get_tag_owner(m_io_ctx, *m_local_image_id, m_tag_owner, | |
113 | m_work_queue, ctx); | |
114 | } | |
115 | ||
116 | template <typename I> | |
117 | void PrepareLocalImageRequest<I>::handle_get_tag_owner(int r) { | |
118 | dout(20) << "r=" << r << ", " | |
119 | << "tag_owner=" << *m_tag_owner << dendl; | |
120 | ||
121 | if (r < 0) { | |
122 | derr << "failed to retrieve journal tag owner: " << cpp_strerror(r) | |
123 | << dendl; | |
124 | finish(r); | |
125 | return; | |
126 | } | |
127 | ||
128 | finish(0); | |
129 | } | |
130 | ||
131 | template <typename I> | |
132 | void PrepareLocalImageRequest<I>::finish(int r) { | |
133 | dout(20) << "r=" << r << dendl; | |
134 | ||
135 | m_on_finish->complete(r); | |
136 | delete this; | |
137 | } | |
138 | ||
139 | } // namespace image_replayer | |
140 | } // namespace mirror | |
141 | } // namespace rbd | |
142 | ||
143 | template class rbd::mirror::image_replayer::PrepareLocalImageRequest<librbd::ImageCtx>; |