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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 "IsPrimaryRequest.h" | |
5 | #include "common/errno.h" | |
6 | #include "common/WorkQueue.h" | |
7 | #include "cls/rbd/cls_rbd_client.h" | |
8 | #include "librbd/ImageCtx.h" | |
9 | #include "librbd/Journal.h" | |
10 | #include "librbd/Utils.h" | |
11 | #include <type_traits> | |
12 | ||
13 | #define dout_context g_ceph_context | |
14 | #define dout_subsys ceph_subsys_rbd_mirror | |
15 | #undef dout_prefix | |
16 | #define dout_prefix *_dout << "rbd::mirror::image_replayer::IsPrimaryRequest: " \ | |
17 | << this << " " << __func__ << " " | |
18 | ||
19 | namespace rbd { | |
20 | namespace mirror { | |
21 | namespace image_replayer { | |
22 | ||
23 | using librbd::util::create_context_callback; | |
24 | using librbd::util::create_rados_callback; | |
25 | ||
26 | template <typename I> | |
27 | IsPrimaryRequest<I>::IsPrimaryRequest(I *image_ctx, bool *primary, | |
28 | Context *on_finish) | |
29 | : m_image_ctx(image_ctx), m_primary(primary), m_on_finish(on_finish) { | |
30 | } | |
31 | ||
32 | template <typename I> | |
33 | void IsPrimaryRequest<I>::send() { | |
34 | send_get_mirror_state(); | |
35 | } | |
36 | ||
37 | template <typename I> | |
38 | void IsPrimaryRequest<I>::send_get_mirror_state() { | |
39 | dout(20) << dendl; | |
40 | ||
41 | librados::ObjectReadOperation op; | |
42 | librbd::cls_client::mirror_image_get_start(&op, m_image_ctx->id); | |
43 | ||
44 | librados::AioCompletion *aio_comp = create_rados_callback< | |
45 | IsPrimaryRequest<I>, &IsPrimaryRequest<I>::handle_get_mirror_state>(this); | |
46 | int r = m_image_ctx->md_ctx.aio_operate(RBD_MIRRORING, aio_comp, &op, | |
47 | &m_out_bl); | |
48 | assert(r == 0); | |
49 | aio_comp->release(); | |
50 | } | |
51 | ||
52 | template <typename I> | |
53 | void IsPrimaryRequest<I>::handle_get_mirror_state(int r) { | |
54 | dout(20) << ": r=" << r << dendl; | |
55 | ||
56 | cls::rbd::MirrorImage mirror_image; | |
57 | if (r == 0) { | |
58 | bufferlist::iterator iter = m_out_bl.begin(); | |
59 | r = librbd::cls_client::mirror_image_get_finish(&iter, &mirror_image); | |
60 | if (r == 0) { | |
61 | if (mirror_image.state == cls::rbd::MIRROR_IMAGE_STATE_ENABLED) { | |
62 | send_is_tag_owner(); | |
63 | return; | |
64 | } else if (mirror_image.state == cls::rbd::MIRROR_IMAGE_STATE_DISABLING) { | |
65 | dout(5) << ": image mirroring is being disabled" << dendl; | |
28e407b8 | 66 | r = -ENOENT; |
7c673cae FG |
67 | } else { |
68 | derr << ": image mirroring is disabled" << dendl; | |
69 | r = -EINVAL; | |
70 | } | |
71 | } else { | |
72 | derr << ": failed to decode image mirror state: " << cpp_strerror(r) | |
73 | << dendl; | |
74 | } | |
28e407b8 AA |
75 | } else if (r == -ENOENT) { |
76 | dout(5) << ": image is not mirrored" << dendl; | |
7c673cae FG |
77 | } else { |
78 | derr << ": failed to retrieve image mirror state: " << cpp_strerror(r) | |
79 | << dendl; | |
80 | } | |
81 | ||
82 | finish(r); | |
83 | } | |
84 | ||
85 | template <typename I> | |
86 | void IsPrimaryRequest<I>::send_is_tag_owner() { | |
87 | // deduce the class type for the journal to support unit tests | |
88 | using Journal = typename std::decay< | |
89 | typename std::remove_pointer<decltype(std::declval<I>().journal)> | |
90 | ::type>::type; | |
91 | ||
92 | dout(20) << dendl; | |
93 | ||
94 | Context *ctx = create_context_callback< | |
95 | IsPrimaryRequest<I>, &IsPrimaryRequest<I>::handle_is_tag_owner>(this); | |
96 | ||
97 | Journal::is_tag_owner(m_image_ctx, m_primary, ctx); | |
98 | } | |
99 | ||
100 | template <typename I> | |
101 | void IsPrimaryRequest<I>::handle_is_tag_owner(int r) { | |
102 | dout(20) << ": r=" << r << dendl; | |
103 | ||
104 | if (r < 0) { | |
105 | derr << ": failed to query remote image tag owner: " << cpp_strerror(r) | |
106 | << dendl; | |
107 | } | |
108 | ||
109 | finish(r); | |
110 | } | |
111 | ||
112 | template <typename I> | |
113 | void IsPrimaryRequest<I>::finish(int r) { | |
114 | dout(20) << ": r=" << r << dendl; | |
115 | ||
116 | m_on_finish->complete(r); | |
117 | delete this; | |
118 | } | |
119 | ||
120 | } // namespace image_replayer | |
121 | } // namespace mirror | |
122 | } // namespace rbd | |
123 | ||
124 | template class rbd::mirror::image_replayer::IsPrimaryRequest<librbd::ImageCtx>; |